AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/09/04 14:21	flow	patch-triage	1m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "KMSANReasoning": "", "NeedsKMSAN": false, "Reasoning": "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX bus driver (drivers/vfio/cdx/main.c). The CDX bus is specific to AMD/Xilinx Versal ACAP platforms and requires physical hardware/firmware (rpmsg/MCDI communication with an R5 management controller) to discover and register CDX devices. Because there are no emulated CDX controllers or devices in standard virtualized QEMU environments (particularly on amd64), the modified code is structurally unreachable.", "WorthFuzzing": false }
1/1	2026/09/04 14:21	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 0c71f6fb2c6a6a05e62c7dd4dbba4b85caef1e61\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Fri Sep 4 14:21:20 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/vfio/cdx/main.c b/drivers/vfio/cdx/main.c\nindex b31ed4be7bdc1..53d916cfcb8e8 100644\n--- a/drivers/vfio/cdx/main.c\n+++ b/drivers/vfio/cdx/main.c\n@@ -254,10 +254,10 @@ static int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,\n \tif (base + size \u003e region.size)\n \t\treturn -EINVAL;\n \n-\tvma-\u003evm_pgoff = (region.addr \u003e\u003e PAGE_SHIFT) + pgoff;\n \tvma-\u003evm_page_prot = pgprot_device(vma-\u003evm_page_prot);\n \n-\treturn io_remap_pfn_range(vma, vma-\u003evm_start, vma-\u003evm_pgoff,\n+\treturn io_remap_pfn_range(vma, vma-\u003evm_start,\n+\t\t\t\t (region.addr \u003e\u003e PAGE_SHIFT) + pgoff,\n \t\t\t\t size, vma-\u003evm_page_prot);\n }\n \n" }
2/1	2026/09/04 14:21	agent	patch-evaluator	1m Model: core Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX bus driver (drivers/vfio/cdx/main.c). The CDX bus is specific to AMD/Xilinx Versal ACAP platforms and requires physical hardware/firmware (rpmsg/MCDI communication with an R5 management controller) to discover and register CDX devices. Because there are no emulated CDX controllers or devices in standard virtualized QEMU environments (particularly on amd64), the modified code is structurally unreachable.", "WorthFuzzing": false } Instruction: You are an expert Linux kernel maintainer and security engineer. Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on internal assumptions. You must actively use your code access tools to inspect the actual source code, callers, and surrounding context. ================================================================================ 1. CORE TRIAGE PHILOSOPHY ================================================================================ The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs, and newly triggered assertions introduced by the patch series. - REACHABILITY IS THE PRIMARY GATE: Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap). If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed, regardless of whether it adds assertions or complex logic. - DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS: Patch authors routinely label changes as "cleanups", "refactorings", or state "No functional change intended". Do NOT take these claims at face value. Code refactorings that rearrange logic, introduce helper functions, or alter state management in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs. If reachable executable code is modified or refactored, it MUST be fuzzed. - NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED: When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON, VM_WARN_ON, BUG_ON, lockdep_assert) in reachable code paths, it enforces new or stricter invariants. Even if the author believes the invariant always holds, fuzzing is essential to verify whether an unusual sequence of operations can violate it. ================================================================================ 2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA) ================================================================================ Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: - Non-kernel and non-executable changes: * Modifications to Documentation/, comments, or spelling fixes. * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/) that do not affect the compiled kernel image (vmlinux) or kernel modules. * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints that do not alter control flow or data structures. * Build system or Kconfig changes that do not alter compiled C logic. - Structurally unreachable hardware: * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU. - Unreachable execution paths: * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding. * Code paths exclusive to architectures other than the target architecture. ================================================================================ 3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA) ================================================================================ Return WorthFuzzing=true whenever the patch touches reachable executable code, including: - Core Subsystems: * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/), BPF, scheduler, core networking, VFS, or syscall handling. - Refactorings and Code Cleanups: * Any restructuring of reachable data structures, helper abstractions, or algorithm flows. - Runtime Assertions and Defensive Checks: * Any introduction or alteration of assertions (WARN_ON, VM_WARN_ON, BUG_ON, etc.) in reachable paths. - Reachable Drivers and Protocols: Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.). ================================================================================ 4. EXTRACTING FocusSymbols (PREVENTING DILUTION) ================================================================================ When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer: - AVOID UBIQUITOUS LIFECYCLE HOT-PATHS: Do NOT list generic, ubiquitous functions called by almost every program in the corpus (including, but not limited to: general memory allocators and deallocators, page fault and trap handlers, or core synchronization primitives; this is not an exhaustive list). Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused", which severely dilutes fuzzing effort away from the actual changes. - TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS: List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review. - HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h): Compiler-inlined static functions (such as static inlines in mm/.h or include/linux/.h) lack distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters. If the changes are primarily in static inline helpers, identify non-static, feature-specific caller functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers). ================================================================================ 5. IDENTIFYING EnableConfigs ================================================================================ Identify any specific CONFIG_ options required to properly compile and reach the modified code: - Inspect Kconfig files and #ifdef guards; do not make assumptions. - Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed. - Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit 0c71f6fb2c6a6a05e62c7dd4dbba4b85caef1e61 Author: syz-cluster <triage@syzkaller.com> Date: Fri Sep 4 14:21:20 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/vfio/cdx/main.c b/drivers/vfio/cdx/main.c index b31ed4be7bdc1..53d916cfcb8e8 100644 --- a/drivers/vfio/cdx/main.c +++ b/drivers/vfio/cdx/main.c @@ -254,10 +254,10 @@ static int vfio_cdx_mmap_mmio(struct vfio_cdx_region region, if (base + size > region.size) return -EINVAL; - vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; vma->vm_page_prot = pgprot_device(vma->vm_page_prot); - return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, + return io_remap_pfn_range(vma, vma->vm_start, + (region.addr >> PAGE_SHIFT) + pgoff, size, vma->vm_page_prot); }
3/2	2026/09/04 14:21	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 2962 output: 19 thoughts: 281 Thoughts: Evaluating a Potential Syzkaller Patch for VFIO/CDX Okay, so I've got a patch here that's touching `drivers/vfio/cdx/main.c`, and the goal is to evaluate its suitability for syzkaller fuzzing. My immediate thought is, "What is CDX, and is it even fuzzable?" I need to understand if this is something that's reachable in a typical system or if it's tied to specific hardware. That's the critical first step. My plan is to dive into the codebase using my standard tools, probably `git grep` and some file reading, to quickly get a lay of the land. I need to figure out what the CDX driver actually does and how it's initialized and used. I'll need to figure out if it is an important bus and part of the main kernel. Now, looking at the actual patch: it's within `vfio_cdx_mmap_mmio`. It looks like it's a small change to how a memory region is mapped, specifically around calculating the page offset and `io_remap_pfn_range`. I'll need to understand how the original code works and how the modification changes the behaviour. My first priority is to understand the context of this change, so I'll probably need to understand what this bus is.
4/2	2026/09/04 14:21	tool	grepper	0m Args: { "Expression": "VFIO_CDX" } Results: { "Output": "drivers/vfio/Makefile=17=obj-$(CONFIG_VFIO_FSL_MC) += fsl-mc/\ndrivers/vfio/Makefile:18:obj-$(CONFIG_VFIO_CDX) += cdx/\n--\ndrivers/vfio/cdx/Kconfig-7-\ndrivers/vfio/cdx/Kconfig:8:config VFIO_CDX\ndrivers/vfio/cdx/Kconfig-9-\ttristate \"VFIO support for CDX bus devices\"\n--\ndrivers/vfio/cdx/Makefile-5-\ndrivers/vfio/cdx/Makefile:6:obj-$(CONFIG_VFIO_CDX) += vfio-cdx.o\ndrivers/vfio/cdx/Makefile-7-\n--\ndrivers/vfio/cdx/main.c=244=static int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,\n--\ndrivers/vfio/cdx/main.c-250-\tpgoff = vma-\u003evm_pgoff \u0026\ndrivers/vfio/cdx/main.c:251:\t\t((1U \u003c\u003c (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT)) - 1);\ndrivers/vfio/cdx/main.c-252-\tbase = pgoff \u003c\u003c PAGE_SHIFT;\n--\ndrivers/vfio/cdx/main.c=264=static int vfio_cdx_mmap(struct vfio_device core_vdev,\n--\ndrivers/vfio/cdx/main.c-271-\ndrivers/vfio/cdx/main.c:272:\tindex = vma-\u003evm_pgoff \u003e\u003e (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT);\ndrivers/vfio/cdx/main.c-273-\n--\ndrivers/vfio/cdx/private.h-5-\ndrivers/vfio/cdx/private.h:6:#ifndef VFIO_CDX_PRIVATE_H\ndrivers/vfio/cdx/private.h:7:#define VFIO_CDX_PRIVATE_H\ndrivers/vfio/cdx/private.h-8-\n--\ndrivers/vfio/cdx/private.h-10-\ndrivers/vfio/cdx/private.h:11:#define VFIO_CDX_OFFSET_SHIFT 40\ndrivers/vfio/cdx/private.h-12-\ndrivers/vfio/cdx/private.h=13=static inline u64 vfio_cdx_index_to_offset(u32 index)\ndrivers/vfio/cdx/private.h-14-{\ndrivers/vfio/cdx/private.h:15:\treturn ((u64)(index) \u003c\u003c VFIO_CDX_OFFSET_SHIFT);\ndrivers/vfio/cdx/private.h-16-}\n--\ndrivers/vfio/cdx/private.h=59=static void vfio_cdx_irqs_cleanup(struct vfio_cdx_device vdev)\n--\ndrivers/vfio/cdx/private.h-63-\ndrivers/vfio/cdx/private.h:64:#endif /* VFIO_CDX_PRIVATE_H */\n" }
5/2	2026/09/04 14:21	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 4354 output: 36 thoughts: 34 Thoughts: Okay, here's my interpretation of that thought process, assuming I'm already pretty familiar with kernel development and hardware: Investigating the CDX Bus Configuration Alright, before I dive into this further, I need to get a clear picture of what this "CDX" bus actually is. The names suggest a connection, but I can't assume. My first stop should be the Kconfig files related to it – `drivers/vfio/cdx/Kconfig` and `drivers/cdx/Kconfig`. These configuration files are the source of truth for the kernel's configuration options. They'll tell me if it’s a VFIO-specific bus, a more general CDX bus, and what its dependencies and intended uses are. That's the best way to grasp its purpose and behavior within the kernel ecosystem. Knowing the configuration options will set me up to look for more information.
6/2	2026/09/04 14:21	tool	read-file	0m Args: { "File": "drivers/vfio/cdx/Kconfig", "FirstLine": 1, "LineCount": 20 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0\n 2:\t#\n 3:\t# VFIO CDX configuration\n 4:\t#\n 5:\t# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.\n 6:\t#\n 7:\t\n 8:\tconfig VFIO_CDX\n 9:\t\ttristate \"VFIO support for CDX bus devices\"\n 10:\t\tdepends on CDX_BUS\n 11:\t\tselect EVENTFD\n 12:\t\thelp\n 13:\t\t Driver to enable VFIO support for the devices on CDX bus.\n 14:\t\t This is required to make use of CDX devices present in\n 15:\t\t the system using the VFIO framework.\n 16:\t\n 17:\t\t If you don't know what to do here, say N.\n" }
7/2	2026/09/04 14:21	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 4846 output: 18 thoughts: 13 Thoughts: Here's my take on the thought process, as if it were my own: Diving into the Kconfig of the CDX Drivers Okay, so I need to get started on this... Let's take a look at the `drivers/cdx/Kconfig` file. I'm going to want to understand the configuration options for the CDX drivers. It's the standard place to start, right? I'll probably be able to glean information about the modules, any dependencies, and default settings from there. This is where the core logic of which drivers are built is laid out. I need to get a handle on the available features and how they are controlled. Time to dig in!
8/2	2026/09/04 14:21	tool	grepper	0m Args: { "Expression": "CDX_BUS" } Results: { "Output": "drivers/Makefile=194=obj-$(CONFIG_DRM_ACCEL)\t\t+= accel/\ndrivers/Makefile:195:obj-$(CONFIG_CDX_BUS)\t\t+= cdx/\ndrivers/Makefile-196-obj-$(CONFIG_DPLL)\t\t+= dpll/\n--\ndrivers/cdx/Kconfig-7-\ndrivers/cdx/Kconfig:8:config CDX_BUS\ndrivers/cdx/Kconfig-9-\tbool \"CDX Bus driver\"\n--\ndrivers/cdx/Makefile-7-\ndrivers/cdx/Makefile:8:ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE='\"CDX_BUS\"'\ndrivers/cdx/Makefile-9-\ndrivers/cdx/Makefile:10:obj-$(CONFIG_CDX_BUS) += cdx.o controller/\ndrivers/cdx/Makefile-11-\ndrivers/cdx/Makefile=12=ifdef CONFIG_GENERIC_MSI_IRQ\ndrivers/cdx/Makefile:13:obj-$(CONFIG_CDX_BUS) += cdx_msi.o\ndrivers/cdx/Makefile-14-endif\n--\ndrivers/cdx/cdx.c=756=int cdx_device_add(struct cdx_dev_params dev_params)\n--\ndrivers/cdx/cdx.c-795-\tdev_set_name(\u0026cdx_dev-\u003edev, \"cdx-%02x:%02x\",\ndrivers/cdx/cdx.c:796:\t\t ((cdx-\u003eid \u003c\u003c CDX_CONTROLLER_ID_SHIFT) \| (cdx_dev-\u003ebus_num \u0026 CDX_BUS_NUM_MASK)),\ndrivers/cdx/cdx.c-797-\t\t cdx_dev-\u003edev_num);\n--\ndrivers/cdx/cdx.c-841-}\ndrivers/cdx/cdx.c:842:EXPORT_SYMBOL_NS_GPL(cdx_device_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-843-\ndrivers/cdx/cdx.c=844=struct device cdx_bus_add(struct cdx_controller cdx, u8 bus_num)\n--\ndrivers/cdx/cdx.c-862-\tdev_set_name(\u0026cdx_dev-\u003edev, \"cdx-%02x\",\ndrivers/cdx/cdx.c:863:\t\t ((cdx-\u003eid \u003c\u003c CDX_CONTROLLER_ID_SHIFT) \| (bus_num \u0026 CDX_BUS_NUM_MASK)));\ndrivers/cdx/cdx.c-864-\n--\ndrivers/cdx/cdx.c-888-}\ndrivers/cdx/cdx.c:889:EXPORT_SYMBOL_NS_GPL(cdx_bus_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-890-\ndrivers/cdx/cdx.c=891=int cdx_register_controller(struct cdx_controller cdx)\n--\ndrivers/cdx/cdx.c-913-}\ndrivers/cdx/cdx.c:914:EXPORT_SYMBOL_NS_GPL(cdx_register_controller, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-915-\ndrivers/cdx/cdx.c=916=void cdx_unregister_controller(struct cdx_controller cdx)\n--\ndrivers/cdx/cdx.c-928-}\ndrivers/cdx/cdx.c:929:EXPORT_SYMBOL_NS_GPL(cdx_unregister_controller, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-930-\n--\ndrivers/cdx/cdx_msi.c=160=struct irq_domain cdx_msi_domain_init(struct device dev)\n--\ndrivers/cdx/cdx_msi.c-192-}\ndrivers/cdx/cdx_msi.c:193:EXPORT_SYMBOL_NS_GPL(cdx_msi_domain_init, \"CDX_BUS_CONTROLLER\");\n--\ndrivers/cdx/controller/Kconfig-7-\ndrivers/cdx/controller/Kconfig:8:if CDX_BUS\ndrivers/cdx/controller/Kconfig-9-\n--\ndrivers/cdx/controller/cdx_controller.c=256=MODULE_LICENSE(\"GPL\");\ndrivers/cdx/controller/cdx_controller.c:257:MODULE_IMPORT_NS(\"CDX_BUS_CONTROLLER\");\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-247-/\ndrivers/cdx/controller/mc_cdx_pcol.h:248: * MC_CMD_CDX_BUS_ENUM_BUSES\ndrivers/cdx/controller/mc_cdx_pcol.h-249- * CDX bus hosts devices (functions) that are implemented using the Composable\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-256- /\ndrivers/cdx/controller/mc_cdx_pcol.h:257:#define MC_CMD_CDX_BUS_ENUM_BUSES\t\t\t\t0x1\ndrivers/cdx/controller/mc_cdx_pcol.h:258:#define MC_CMD_CDX_BUS_ENUM_BUSES_MSGSET\t\t\t0x1\ndrivers/cdx/controller/mc_cdx_pcol.h-259-#undef MC_CMD_0x1_PRIVILEGE_CTG\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-262-\ndrivers/cdx/controller/mc_cdx_pcol.h:263:/ MC_CMD_CDX_BUS_ENUM_BUSES_IN msgrequest /\ndrivers/cdx/controller/mc_cdx_pcol.h:264:#define MC_CMD_CDX_BUS_ENUM_BUSES_IN_LEN\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h-265-\ndrivers/cdx/controller/mc_cdx_pcol.h:266:/ MC_CMD_CDX_BUS_ENUM_BUSES_OUT msgresponse /\ndrivers/cdx/controller/mc_cdx_pcol.h:267:#define MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-268-/\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-271- /\ndrivers/cdx/controller/mc_cdx_pcol.h:272:#define MC_CMD_CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT_OFST\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:273:#define MC_CMD_CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-274-\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-276-/\ndrivers/cdx/controller/mc_cdx_pcol.h:277: * MC_CMD_CDX_BUS_ENUM_DEVICES\ndrivers/cdx/controller/mc_cdx_pcol.h-278- * Enumerate CDX bus devices on a given bus\ndrivers/cdx/controller/mc_cdx_pcol.h-279- /\ndrivers/cdx/controller/mc_cdx_pcol.h:280:#define MC_CMD_CDX_BUS_ENUM_DEVICES\t\t\t\t0x2\ndrivers/cdx/controller/mc_cdx_pcol.h:281:#define MC_CMD_CDX_BUS_ENUM_DEVICES_MSGSET\t\t\t0x2\ndrivers/cdx/controller/mc_cdx_pcol.h-282-#undef MC_CMD_0x2_PRIVILEGE_CTG\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-285-\ndrivers/cdx/controller/mc_cdx_pcol.h:286:/ MC_CMD_CDX_BUS_ENUM_DEVICES_IN msgrequest /\ndrivers/cdx/controller/mc_cdx_pcol.h:287:#define MC_CMD_CDX_BUS_ENUM_DEVICES_IN_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-288-/\ndrivers/cdx/controller/mc_cdx_pcol.h-289- * Bus number to enumerate, in range 0 to BUS_COUNT-1, as returned by\ndrivers/cdx/controller/mc_cdx_pcol.h:290: * MC_CMD_CDX_BUS_ENUM_BUSES_OUT\ndrivers/cdx/controller/mc_cdx_pcol.h-291- /\ndrivers/cdx/controller/mc_cdx_pcol.h:292:#define MC_CMD_CDX_BUS_ENUM_DEVICES_IN_BUS_OFST\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:293:#define MC_CMD_CDX_BUS_ENUM_DEVICES_IN_BUS_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-294-\ndrivers/cdx/controller/mc_cdx_pcol.h:295:/ MC_CMD_CDX_BUS_ENUM_DEVICES_OUT msgresponse /\ndrivers/cdx/controller/mc_cdx_pcol.h:296:#define MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-297-/\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-301- /\ndrivers/cdx/controller/mc_cdx_pcol.h:302:#define MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT_OFST\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:303:#define MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT_LEN\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-304-\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-306-/\ndrivers/cdx/controller/mc_cdx_pcol.h:307: * MC_CMD_CDX_BUS_GET_DEVICE_CONFIG\ndrivers/cdx/controller/mc_cdx_pcol.h-308- * Returns device identification and MMIO/MSI resource data for a CDX device.\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-318- /\ndrivers/cdx/controller/mc_cdx_pcol.h:319:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG\t\t\t\t\t0x3\ndrivers/cdx/controller/mc_cdx_pcol.h:320:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_MSGSET\t\t\t\t\t0x3\ndrivers/cdx/controller/mc_cdx_pcol.h-321-#undef MC_CMD_0x3_PRIVILEGE_CTG\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-324-\ndrivers/cdx/controller/mc_cdx_pcol.h:325:/ MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN msgrequest /\ndrivers/cdx/controller/mc_cdx_pcol.h:326:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_LEN\t\t\t\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h-327-/ Device bus number, in range 0 to BUS_COUNT-1 /\ndrivers/cdx/controller/mc_cdx_pcol.h:328:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_BUS_OFST\t\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:329:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_BUS_LEN\t\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-330-/ Device number relative to the bus, in range 0 to DEVICE_COUNT-1 for that bus /\ndrivers/cdx/controller/mc_cdx_pcol.h:331:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE_OFST\t\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:332:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE_LEN\t\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-333-\ndrivers/cdx/controller/mc_cdx_pcol.h:334:/ MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT msgresponse /\ndrivers/cdx/controller/mc_cdx_pcol.h:335:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_LEN\t\t\t\t88\ndrivers/cdx/controller/mc_cdx_pcol.h-336-/ 16-bit Vendor identifier, compliant with PCI-SIG VendorID assignment. /\ndrivers/cdx/controller/mc_cdx_pcol.h:337:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_VENDOR_ID_OFST\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:338:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_VENDOR_ID_LEN\t\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h-339-/ 16-bit Device ID assigned by the vendor /\ndrivers/cdx/controller/mc_cdx_pcol.h:340:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_ID_OFST\t\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h:341:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_ID_LEN\t\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h-342-/\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-345- /\ndrivers/cdx/controller/mc_cdx_pcol.h:346:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_VENDOR_ID_OFST\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:347:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_VENDOR_ID_LEN\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h-348-/\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-351- /\ndrivers/cdx/controller/mc_cdx_pcol.h:352:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_DEVICE_ID_OFST\t\t6\ndrivers/cdx/controller/mc_cdx_pcol.h:353:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_DEVICE_ID_LEN\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h-354-/ 24-bit Device Class code, compliant with PCI-SIG Device Class codes /\ndrivers/cdx/controller/mc_cdx_pcol.h:355:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_CLASS_OFST\t\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:356:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_CLASS_LEN\t\t\t3\ndrivers/cdx/controller/mc_cdx_pcol.h-357-/ 8-bit vendor-assigned revision /\ndrivers/cdx/controller/mc_cdx_pcol.h:358:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_REVISION_OFST\t\t11\ndrivers/cdx/controller/mc_cdx_pcol.h:359:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_REVISION_LEN\t\t1\ndrivers/cdx/controller/mc_cdx_pcol.h-360-/ Reserved (alignment) /\ndrivers/cdx/controller/mc_cdx_pcol.h:361:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_RESERVED_OFST\t\t\t12\ndrivers/cdx/controller/mc_cdx_pcol.h:362:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_RESERVED_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-363-/ MMIO region 0 base address (bus address), 0 if unused /\ndrivers/cdx/controller/mc_cdx_pcol.h:364:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_OFST\t\t16\ndrivers/cdx/controller/mc_cdx_pcol.h:365:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:366:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_OFST\t\t16\ndrivers/cdx/controller/mc_cdx_pcol.h:367:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:368:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_LBN\t\t128\ndrivers/cdx/controller/mc_cdx_pcol.h:369:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:370:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_OFST\t\t20\ndrivers/cdx/controller/mc_cdx_pcol.h:371:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:372:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_LBN\t\t160\ndrivers/cdx/controller/mc_cdx_pcol.h:373:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-374-/ MMIO region 0 size, 0 if unused /\ndrivers/cdx/controller/mc_cdx_pcol.h:375:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_OFST\t\t24\ndrivers/cdx/controller/mc_cdx_pcol.h:376:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:377:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_OFST\t\t24\ndrivers/cdx/controller/mc_cdx_pcol.h:378:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:379:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_LBN\t\t192\ndrivers/cdx/controller/mc_cdx_pcol.h:380:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:381:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_OFST\t\t28\ndrivers/cdx/controller/mc_cdx_pcol.h:382:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:383:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_LBN\t\t224\ndrivers/cdx/controller/mc_cdx_pcol.h:384:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-385-/ MMIO region 1 base address (bus address), 0 if unused /\ndrivers/cdx/controller/mc_cdx_pcol.h:386:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_OFST\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:387:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:388:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_OFST\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:389:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:390:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_LBN\t\t256\ndrivers/cdx/controller/mc_cdx_pcol.h:391:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:392:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_OFST\t\t36\ndrivers/cdx/controller/mc_cdx_pcol.h:393:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:394:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_LBN\t\t288\ndrivers/cdx/controller/mc_cdx_pcol.h:395:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-396-/ MMIO region 1 size, 0 if unused /\ndrivers/cdx/controller/mc_cdx_pcol.h:397:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_OFST\t\t40\ndrivers/cdx/controller/mc_cdx_pcol.h:398:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:399:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_OFST\t\t40\ndrivers/cdx/controller/mc_cdx_pcol.h:400:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:401:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_LBN\t\t320\ndrivers/cdx/controller/mc_cdx_pcol.h:402:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:403:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_OFST\t\t44\ndrivers/cdx/controller/mc_cdx_pcol.h:404:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:405:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_LBN\t\t352\ndrivers/cdx/controller/mc_cdx_pcol.h:406:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-407-/ MMIO region 2 base address (bus address), 0 if unused /\ndrivers/cdx/controller/mc_cdx_pcol.h:408:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_OFST\t\t48\ndrivers/cdx/controller/mc_cdx_pcol.h:409:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:410:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_OFST\t\t48\ndrivers/cdx/controller/mc_cdx_pcol.h:411:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:412:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_LBN\t\t384\ndrivers/cdx/controller/mc_cdx_pcol.h:413:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:414:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_OFST\t\t52\ndrivers/cdx/controller/mc_cdx_pcol.h:415:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:416:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_LBN\t\t416\ndrivers/cdx/controller/mc_cdx_pcol.h:417:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-418-/ MMIO region 2 size, 0 if unused /\ndrivers/cdx/controller/mc_cdx_pcol.h:419:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_OFST\t\t56\ndrivers/cdx/controller/mc_cdx_pcol.h:420:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:421:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_OFST\t\t56\ndrivers/cdx/controller/mc_cdx_pcol.h:422:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:423:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_LBN\t\t448\ndrivers/cdx/controller/mc_cdx_pcol.h:424:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:425:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_OFST\t\t60\ndrivers/cdx/controller/mc_cdx_pcol.h:426:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:427:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_LBN\t\t480\ndrivers/cdx/controller/mc_cdx_pcol.h:428:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-429-/ MMIO region 3 base address (bus address), 0 if unused /\ndrivers/cdx/controller/mc_cdx_pcol.h:430:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_OFST\t\t64\ndrivers/cdx/controller/mc_cdx_pcol.h:431:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:432:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_OFST\t\t64\ndrivers/cdx/controller/mc_cdx_pcol.h:433:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:434:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_LBN\t\t512\ndrivers/cdx/controller/mc_cdx_pcol.h:435:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:436:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_OFST\t\t68\ndrivers/cdx/controller/mc_cdx_pcol.h:437:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:438:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_LBN\t\t544\ndrivers/cdx/controller/mc_cdx_pcol.h:439:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-440-/ MMIO region 3 size, 0 if unused /\ndrivers/cdx/controller/mc_cdx_pcol.h:441:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_OFST\t\t72\ndrivers/cdx/controller/mc_cdx_pcol.h:442:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:443:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_OFST\t\t72\ndrivers/cdx/controller/mc_cdx_pcol.h:444:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:445:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_LBN\t\t576\ndrivers/cdx/controller/mc_cdx_pcol.h:446:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:447:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_OFST\t\t76\ndrivers/cdx/controller/mc_cdx_pcol.h:448:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:449:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_LBN\t\t608\ndrivers/cdx/controller/mc_cdx_pcol.h:450:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-451-/ MSI vector count /\ndrivers/cdx/controller/mc_cdx_pcol.h:452:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MSI_COUNT_OFST\t\t\t80\ndrivers/cdx/controller/mc_cdx_pcol.h:453:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MSI_COUNT_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-454-/ Requester ID used by device (SMMU StreamID, GIC ITS DeviceID) /\ndrivers/cdx/controller/mc_cdx_pcol.h:455:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID_OFST\t\t\t84\ndrivers/cdx/controller/mc_cdx_pcol.h:456:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-457-\ndrivers/cdx/controller/mc_cdx_pcol.h:458:/ MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2 msgresponse /\ndrivers/cdx/controller/mc_cdx_pcol.h:459:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_LEN\t\t\t\t92\ndrivers/cdx/controller/mc_cdx_pcol.h-460-/ Requester ID used by device for GIC ITS DeviceID /\ndrivers/cdx/controller/mc_cdx_pcol.h:461:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_REQUESTER_DEVICE_ID_OFST\t88\ndrivers/cdx/controller/mc_cdx_pcol.h:462:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_REQUESTER_DEVICE_ID_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-463-\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-465-/\ndrivers/cdx/controller/mc_cdx_pcol.h:466: * MC_CMD_CDX_BUS_DOWN\ndrivers/cdx/controller/mc_cdx_pcol.h-467- * Asserting reset on the CDX bus causes all devices on the bus to be quiesced.\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-477- /\ndrivers/cdx/controller/mc_cdx_pcol.h:478:#define MC_CMD_CDX_BUS_DOWN\t\t\t\t\t0x4\ndrivers/cdx/controller/mc_cdx_pcol.h:479:#define MC_CMD_CDX_BUS_DOWN_MSGSET\t\t\t0x4\ndrivers/cdx/controller/mc_cdx_pcol.h-480-\ndrivers/cdx/controller/mc_cdx_pcol.h:481:/ MC_CMD_CDX_BUS_DOWN_IN msgrequest /\ndrivers/cdx/controller/mc_cdx_pcol.h:482:#define MC_CMD_CDX_BUS_DOWN_IN_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-483-/ Bus number to put in reset, in range 0 to BUS_COUNT-1 /\ndrivers/cdx/controller/mc_cdx_pcol.h:484:#define MC_CMD_CDX_BUS_DOWN_IN_BUS_OFST\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:485:#define MC_CMD_CDX_BUS_DOWN_IN_BUS_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-486-\ndrivers/cdx/controller/mc_cdx_pcol.h-487-/\ndrivers/cdx/controller/mc_cdx_pcol.h:488: * MC_CMD_CDX_BUS_DOWN_OUT msgresponse: The bus is quiesced, no further\ndrivers/cdx/controller/mc_cdx_pcol.h-489- * upstream traffic for devices on this bus.\ndrivers/cdx/controller/mc_cdx_pcol.h-490- /\ndrivers/cdx/controller/mc_cdx_pcol.h:491:#define MC_CMD_CDX_BUS_DOWN_OUT_LEN\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h-492-\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-494-/\ndrivers/cdx/controller/mc_cdx_pcol.h:495: * MC_CMD_CDX_BUS_UP\ndrivers/cdx/controller/mc_cdx_pcol.h-496- * After bus reset is de-asserted, devices are in a state which is functionally\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-505- /\ndrivers/cdx/controller/mc_cdx_pcol.h:506:#define MC_CMD_CDX_BUS_UP\t\t\t\t\t0x5\ndrivers/cdx/controller/mc_cdx_pcol.h:507:#define MC_CMD_CDX_BUS_UP_MSGSET\t\t\t0x5\ndrivers/cdx/controller/mc_cdx_pcol.h-508-\ndrivers/cdx/controller/mc_cdx_pcol.h:509:/ MC_CMD_CDX_BUS_UP_IN msgrequest /\ndrivers/cdx/controller/mc_cdx_pcol.h:510:#define MC_CMD_CDX_BUS_UP_IN_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-511-/ Bus number to take out of reset, in range 0 to BUS_COUNT-1 /\ndrivers/cdx/controller/mc_cdx_pcol.h:512:#define MC_CMD_CDX_BUS_UP_IN_BUS_OFST\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:513:#define MC_CMD_CDX_BUS_UP_IN_BUS_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-514-\ndrivers/cdx/controller/mc_cdx_pcol.h:515:/ MC_CMD_CDX_BUS_UP_OUT msgresponse: The bus can now be enumerated. /\ndrivers/cdx/controller/mc_cdx_pcol.h:516:#define MC_CMD_CDX_BUS_UP_OUT_LEN\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h-517-\n--\ndrivers/cdx/controller/mcdi_functions.c=10=int cdx_mcdi_get_num_buses(struct cdx_mcdi cdx)\ndrivers/cdx/controller/mcdi_functions.c-11-{\ndrivers/cdx/controller/mcdi_functions.c:12:\tMCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN);\ndrivers/cdx/controller/mcdi_functions.c-13-\tsize_t outlen;\n--\ndrivers/cdx/controller/mcdi_functions.c-15-\ndrivers/cdx/controller/mcdi_functions.c:16:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_ENUM_BUSES, NULL, 0,\ndrivers/cdx/controller/mcdi_functions.c-17-\t\t\t outbuf, sizeof(outbuf), \u0026outlen);\n--\ndrivers/cdx/controller/mcdi_functions.c-20-\ndrivers/cdx/controller/mcdi_functions.c:21:\tif (outlen != MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN)\ndrivers/cdx/controller/mcdi_functions.c-22-\t\treturn -EIO;\ndrivers/cdx/controller/mcdi_functions.c-23-\ndrivers/cdx/controller/mcdi_functions.c:24:\treturn MCDI_DWORD(outbuf, CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT);\ndrivers/cdx/controller/mcdi_functions.c-25-}\n--\ndrivers/cdx/controller/mcdi_functions.c=27=int cdx_mcdi_get_num_devs(struct cdx_mcdi cdx, int bus_num)\ndrivers/cdx/controller/mcdi_functions.c-28-{\ndrivers/cdx/controller/mcdi_functions.c:29:\tMCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN);\ndrivers/cdx/controller/mcdi_functions.c:30:\tMCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_ENUM_DEVICES_IN_LEN);\ndrivers/cdx/controller/mcdi_functions.c-31-\tsize_t outlen;\n--\ndrivers/cdx/controller/mcdi_functions.c-33-\ndrivers/cdx/controller/mcdi_functions.c:34:\tMCDI_SET_DWORD(inbuf, CDX_BUS_ENUM_DEVICES_IN_BUS, bus_num);\ndrivers/cdx/controller/mcdi_functions.c-35-\ndrivers/cdx/controller/mcdi_functions.c:36:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_ENUM_DEVICES, inbuf, sizeof(inbuf),\ndrivers/cdx/controller/mcdi_functions.c-37-\t\t\t outbuf, sizeof(outbuf), \u0026outlen);\n--\ndrivers/cdx/controller/mcdi_functions.c-40-\ndrivers/cdx/controller/mcdi_functions.c:41:\tif (outlen != MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN)\ndrivers/cdx/controller/mcdi_functions.c-42-\t\treturn -EIO;\ndrivers/cdx/controller/mcdi_functions.c-43-\ndrivers/cdx/controller/mcdi_functions.c:44:\treturn MCDI_DWORD(outbuf, CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT);\ndrivers/cdx/controller/mcdi_functions.c-45-}\n--\ndrivers/cdx/controller/mcdi_functions.c=47=int cdx_mcdi_get_dev_config(struct cdx_mcdi cdx,\n--\ndrivers/cdx/controller/mcdi_functions.c-50-{\ndrivers/cdx/controller/mcdi_functions.c:51:\tMCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_LEN);\ndrivers/cdx/controller/mcdi_functions.c:52:\tMCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_LEN);\ndrivers/cdx/controller/mcdi_functions.c-53-\tstruct resource res = \u0026dev_params-\u003eres[0];\n--\ndrivers/cdx/controller/mcdi_functions.c-57-\ndrivers/cdx/controller/mcdi_functions.c:58:\tMCDI_SET_DWORD(inbuf, CDX_BUS_GET_DEVICE_CONFIG_IN_BUS, bus_num);\ndrivers/cdx/controller/mcdi_functions.c:59:\tMCDI_SET_DWORD(inbuf, CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE, dev_num);\ndrivers/cdx/controller/mcdi_functions.c-60-\ndrivers/cdx/controller/mcdi_functions.c:61:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG, inbuf, sizeof(inbuf),\ndrivers/cdx/controller/mcdi_functions.c-62-\t\t\t outbuf, sizeof(outbuf), \u0026outlen);\n--\ndrivers/cdx/controller/mcdi_functions.c-65-\ndrivers/cdx/controller/mcdi_functions.c:66:\tif (outlen != MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_LEN)\ndrivers/cdx/controller/mcdi_functions.c-67-\t\treturn -EIO;\n--\ndrivers/cdx/controller/mcdi_functions.c-71-\ndrivers/cdx/controller/mcdi_functions.c:72:\treq_id = MCDI_DWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID);\ndrivers/cdx/controller/mcdi_functions.c-73-\tdev_params-\u003ereq_id = req_id;\n--\ndrivers/cdx/controller/mcdi_functions.c-75-\tdev_params-\u003emsi_dev_id = MCDI_DWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:76:\t\t\t\t\t CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_REQUESTER_DEVICE_ID);\ndrivers/cdx/controller/mcdi_functions.c-77-\ndrivers/cdx/controller/mcdi_functions.c-78-\tdev_params-\u003eres_count = 0;\ndrivers/cdx/controller/mcdi_functions.c:79:\tif (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE) != 0) {\ndrivers/cdx/controller/mcdi_functions.c-80-\t\tres[dev_params-\u003eres_count].start =\ndrivers/cdx/controller/mcdi_functions.c:81:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE);\ndrivers/cdx/controller/mcdi_functions.c-82-\t\tres[dev_params-\u003eres_count].end =\ndrivers/cdx/controller/mcdi_functions.c:83:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE) +\ndrivers/cdx/controller/mcdi_functions.c-84-\t\t\t\t MCDI_QWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:85:\t\t\t\t\t CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE) - 1;\ndrivers/cdx/controller/mcdi_functions.c-86-\t\tres[dev_params-\u003eres_count].flags = IORESOURCE_MEM;\n--\ndrivers/cdx/controller/mcdi_functions.c-89-\ndrivers/cdx/controller/mcdi_functions.c:90:\tif (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE) != 0) {\ndrivers/cdx/controller/mcdi_functions.c-91-\t\tres[dev_params-\u003eres_count].start =\ndrivers/cdx/controller/mcdi_functions.c:92:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE);\ndrivers/cdx/controller/mcdi_functions.c-93-\t\tres[dev_params-\u003eres_count].end =\ndrivers/cdx/controller/mcdi_functions.c:94:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE) +\ndrivers/cdx/controller/mcdi_functions.c-95-\t\t\t\t MCDI_QWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:96:\t\t\t\t\t CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE) - 1;\ndrivers/cdx/controller/mcdi_functions.c-97-\t\tres[dev_params-\u003eres_count].flags = IORESOURCE_MEM;\n--\ndrivers/cdx/controller/mcdi_functions.c-100-\ndrivers/cdx/controller/mcdi_functions.c:101:\tif (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE) != 0) {\ndrivers/cdx/controller/mcdi_functions.c-102-\t\tres[dev_params-\u003eres_count].start =\ndrivers/cdx/controller/mcdi_functions.c:103:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE);\ndrivers/cdx/controller/mcdi_functions.c-104-\t\tres[dev_params-\u003eres_count].end =\ndrivers/cdx/controller/mcdi_functions.c:105:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE) +\ndrivers/cdx/controller/mcdi_functions.c-106-\t\t\t\t MCDI_QWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:107:\t\t\t\t\t CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE) - 1;\ndrivers/cdx/controller/mcdi_functions.c-108-\t\tres[dev_params-\u003eres_count].flags = IORESOURCE_MEM;\n--\ndrivers/cdx/controller/mcdi_functions.c-111-\ndrivers/cdx/controller/mcdi_functions.c:112:\tif (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE) != 0) {\ndrivers/cdx/controller/mcdi_functions.c-113-\t\tres[dev_params-\u003eres_count].start =\ndrivers/cdx/controller/mcdi_functions.c:114:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE);\ndrivers/cdx/controller/mcdi_functions.c-115-\t\tres[dev_params-\u003eres_count].end =\ndrivers/cdx/controller/mcdi_functions.c:116:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE) +\ndrivers/cdx/controller/mcdi_functions.c-117-\t\t\t\t MCDI_QWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:118:\t\t\t\t\t CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE) - 1;\ndrivers/cdx/controller/mcdi_functions.c-119-\t\tres[dev_params-\u003eres_count].flags = IORESOURCE_MEM;\n--\ndrivers/cdx/controller/mcdi_functions.c-122-\ndrivers/cdx/controller/mcdi_functions.c:123:\tdev_params-\u003evendor = MCDI_WORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_VENDOR_ID);\ndrivers/cdx/controller/mcdi_functions.c:124:\tdev_params-\u003edevice = MCDI_WORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_ID);\ndrivers/cdx/controller/mcdi_functions.c-125-\tdev_params-\u003esubsys_vendor = MCDI_WORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:126:\t\t\t\t\t CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_VENDOR_ID);\ndrivers/cdx/controller/mcdi_functions.c-127-\tdev_params-\u003esubsys_device = MCDI_WORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:128:\t\t\t\t\t CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_DEVICE_ID);\ndrivers/cdx/controller/mcdi_functions.c-129-\tdev_params-\u003eclass = MCDI_DWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:130:\t\t\t\t CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_CLASS) \u0026 0xFFFFFF;\ndrivers/cdx/controller/mcdi_functions.c:131:\tdev_params-\u003erevision = MCDI_BYTE(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_REVISION);\ndrivers/cdx/controller/mcdi_functions.c:132:\tdev_params-\u003enum_msi = MCDI_DWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MSI_COUNT);\ndrivers/cdx/controller/mcdi_functions.c-133-\n--\ndrivers/cdx/controller/mcdi_functions.c=137=int cdx_mcdi_bus_enable(struct cdx_mcdi cdx, u8 bus_num)\ndrivers/cdx/controller/mcdi_functions.c-138-{\ndrivers/cdx/controller/mcdi_functions.c:139:\tMCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_UP_IN_LEN);\ndrivers/cdx/controller/mcdi_functions.c-140-\tint ret;\ndrivers/cdx/controller/mcdi_functions.c-141-\ndrivers/cdx/controller/mcdi_functions.c:142:\tMCDI_SET_DWORD(inbuf, CDX_BUS_UP_IN_BUS, bus_num);\ndrivers/cdx/controller/mcdi_functions.c:143:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_UP, inbuf, sizeof(inbuf),\ndrivers/cdx/controller/mcdi_functions.c-144-\t\t\t NULL, 0, NULL);\n--\ndrivers/cdx/controller/mcdi_functions.c=149=int cdx_mcdi_bus_disable(struct cdx_mcdi cdx, u8 bus_num)\ndrivers/cdx/controller/mcdi_functions.c-150-{\ndrivers/cdx/controller/mcdi_functions.c:151:\tMCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_DOWN_IN_LEN);\ndrivers/cdx/controller/mcdi_functions.c-152-\tint ret;\ndrivers/cdx/controller/mcdi_functions.c-153-\ndrivers/cdx/controller/mcdi_functions.c:154:\tMCDI_SET_DWORD(inbuf, CDX_BUS_DOWN_IN_BUS, bus_num);\ndrivers/cdx/controller/mcdi_functions.c:155:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_DOWN, inbuf, sizeof(inbuf),\ndrivers/cdx/controller/mcdi_functions.c-156-\t\t\t NULL, 0, NULL);\n--\ndrivers/gpu/drm/radeon/r600.c=1615=u32 r600_gpu_check_soft_reset(struct radeon_device rdev)\n--\ndrivers/gpu/drm/radeon/r600.c-1667-\tif (G_000E50_MCB_BUSY(tmp) \| G_000E50_MCDZ_BUSY(tmp) \|\ndrivers/gpu/drm/radeon/r600.c:1668:\t G_000E50_MCDY_BUSY(tmp) \| G_000E50_MCDX_BUSY(tmp) \|\ndrivers/gpu/drm/radeon/r600.c-1669-\t G_000E50_MCDW_BUSY(tmp))\n--\ndrivers/gpu/drm/radeon/r600d.h-1833-#define\t\tG_000E50_MCDY_BUSY(x)\t\t\t(((x) \u003e\u003e 11) \u0026 1)\ndrivers/gpu/drm/radeon/r600d.h:1834:#define\t\tG_000E50_MCDX_BUSY(x)\t\t\t(((x) \u003e\u003e 12) \u0026 1)\ndrivers/gpu/drm/radeon/r600d.h-1835-#define\t\tG_000E50_MCDW_BUSY(x)\t\t\t(((x) \u003e\u003e 13) \u0026 1)\n--\ndrivers/iommu/iommu.c=186=static const struct bus_type * const iommu_buses[] = {\n--\ndrivers/iommu/iommu.c-199-#endif\ndrivers/iommu/iommu.c:200:#ifdef CONFIG_CDX_BUS\ndrivers/iommu/iommu.c-201-\t\u0026cdx_bus_type,\n--\ndrivers/vfio/cdx/Kconfig=8=config VFIO_CDX\ndrivers/vfio/cdx/Kconfig-9-\ttristate \"VFIO support for CDX bus devices\"\ndrivers/vfio/cdx/Kconfig:10:\tdepends on CDX_BUS\ndrivers/vfio/cdx/Kconfig-11-\tselect EVENTFD\n--\ndrivers/vfio/cdx/main.c=361=MODULE_DESCRIPTION(\"VFIO for CDX devices - User Level meta-driver\");\ndrivers/vfio/cdx/main.c:362:MODULE_IMPORT_NS(\"CDX_BUS\");\n--\ninclude/linux/cdx/cdx_bus.h-8-\ninclude/linux/cdx/cdx_bus.h:9:#ifndef _CDX_BUS_H_\ninclude/linux/cdx/cdx_bus.h:10:#define _CDX_BUS_H_\ninclude/linux/cdx/cdx_bus.h-11-\n--\ninclude/linux/cdx/cdx_bus.h-18-#define CDX_CONTROLLER_ID_SHIFT 4\ninclude/linux/cdx/cdx_bus.h:19:#define CDX_BUS_NUM_MASK 0xF\ninclude/linux/cdx/cdx_bus.h-20-\n--\ninclude/linux/cdx/cdx_bus.h=281=static inline void cdx_disable_msi(struct cdx_device cdx_dev)\n--\ninclude/linux/cdx/cdx_bus.h-286-\ninclude/linux/cdx/cdx_bus.h:287:#endif / _CDX_BUS_H_ */\n" }
9/2	2026/09/04 14:21	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 20803 output: 20 thoughts: 26 Thoughts: Here's my take on the thought process: Investigating CDX Controller Registration Okay, so I need to figure out which drivers are registering themselves as `cdx_controller` instances. The most direct approach is to leverage my old friend, `grep`. I'll run a search specifically looking for the function name `cdx_register_controller`. This should give me a quick list of all the places in the codebase where this registration is happening. From there, I can start to understand which specific drivers are managing these controllers and what their respective roles are. This gives me a starting point for further investigation if needed.
10/2	2026/09/04 14:21	tool	grepper	0m Args: { "Expression": "cdx_register_controller" } Results: { "Output": "drivers/cdx/cdx.c=889=EXPORT_SYMBOL_NS_GPL(cdx_bus_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-890-\ndrivers/cdx/cdx.c:891:int cdx_register_controller(struct cdx_controller cdx)\ndrivers/cdx/cdx.c-892-{\n--\ndrivers/cdx/cdx.c-913-}\ndrivers/cdx/cdx.c:914:EXPORT_SYMBOL_NS_GPL(cdx_register_controller, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-915-\n--\ndrivers/cdx/cdx.h=31=struct cdx_dev_params {\n--\ndrivers/cdx/cdx.h-49-/\ndrivers/cdx/cdx.h:50: cdx_register_controller - Register a CDX controller and its ports\ndrivers/cdx/cdx.h-51- \t\ton the CDX bus.\n--\ndrivers/cdx/cdx.h-55- /\ndrivers/cdx/cdx.h:56:int cdx_register_controller(struct cdx_controller cdx);\ndrivers/cdx/cdx.h-57-\n--\ndrivers/cdx/controller/cdx_controller.c=46=void cdx_rpmsg_post_probe(struct cdx_controller cdx)\n--\ndrivers/cdx/controller/cdx_controller.c-48-\t/* Register CDX controller with CDX bus driver */\ndrivers/cdx/controller/cdx_controller.c:49:\tif (cdx_register_controller(cdx))\ndrivers/cdx/controller/cdx_controller.c-50-\t\tdev_err(cdx-\u003edev, \"Failed to register CDX controller\\n\");\n" }
11/2	2026/09/04 14:21	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 21462 output: 28 thoughts: 40 Thoughts: Okay, let's dive into this. I need to understand what's happening within the `drivers/cdx/controller/cdx_controller.c` file. My initial thought is to figure out what functionality that file is responsible for and, more specifically, what the `cdx` controller is doing. A good first step would be to get a handle on the register initialization and usage. I'll need to locate where this file is registered within the larger system. Time to fire up `grep` within the `drivers/cdx/controller/` directory and see what pops up, searching for mentions of the `cdx_controller.c` file. Hopefully, this will lead me to the relevant initialization routines or module registration points and give me a clear picture of its integration.
12/2	2026/09/04 14:21	tool	grepper	0m Args: { "Expression": "cdx_controller", "PathPrefix": "drivers/cdx" } Results: { "Output": "drivers/cdx/cdx.c-78-/* IDA for CDX controllers registered with the CDX bus /\ndrivers/cdx/cdx.c:79:static DEFINE_IDA(cdx_controller_ida);\ndrivers/cdx/cdx.c-80-/ Lock to protect controller ops /\ndrivers/cdx/cdx.c:81:static DEFINE_MUTEX(cdx_controller_lock);\ndrivers/cdx/cdx.c-82-/ Debugfs dir for cdx bus /\n--\ndrivers/cdx/cdx.c=95=int cdx_dev_reset(struct device dev)\n--\ndrivers/cdx/cdx.c-97-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:98:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-99-\tstruct cdx_device_config dev_config = {0};\n--\ndrivers/cdx/cdx.c=146=static int cdx_unregister_device(struct device dev,\n--\ndrivers/cdx/cdx.c-149-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:150:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-151-\n--\ndrivers/cdx/cdx.c=223=int cdx_set_master(struct cdx_device cdx_dev)\ndrivers/cdx/cdx.c-224-{\ndrivers/cdx/cdx.c:225:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-226-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/cdx.c=239=int cdx_clear_master(struct cdx_device cdx_dev)\ndrivers/cdx/cdx.c-240-{\ndrivers/cdx/cdx.c:241:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-242-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/cdx.c=302=static int cdx_probe(struct device dev)\n--\ndrivers/cdx/cdx.c-305-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:306:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-307-\tint error;\n--\ndrivers/cdx/cdx.c=337=static void cdx_shutdown(struct device dev)\n--\ndrivers/cdx/cdx.c-340-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:341:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-342-\n--\ndrivers/cdx/cdx.c=349=static int cdx_dma_configure(struct device dev)\n--\ndrivers/cdx/cdx.c-352-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:353:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-354-\tu32 input_id = cdx_dev-\u003ereq_id;\n--\ndrivers/cdx/cdx.c=456=static ssize_t enable_store(struct device dev, struct device_attribute attr,\n--\ndrivers/cdx/cdx.c-459-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:460:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-461-\tbool enable;\n--\ndrivers/cdx/cdx.c=575=static ssize_t rescan_store(const struct bus_type bus,\n--\ndrivers/cdx/cdx.c-577-{\ndrivers/cdx/cdx.c:578:\tstruct cdx_controller cdx;\ndrivers/cdx/cdx.c-579-\tstruct platform_device pd;\n--\ndrivers/cdx/cdx.c-587-\ndrivers/cdx/cdx.c:588:\tguard(mutex)(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-589-\n--\ndrivers/cdx/cdx.c=756=int cdx_device_add(struct cdx_dev_params dev_params)\ndrivers/cdx/cdx.c-757-{\ndrivers/cdx/cdx.c:758:\tstruct cdx_controller cdx = dev_params-\u003ecdx;\ndrivers/cdx/cdx.c-759-\tstruct cdx_device cdx_dev;\n--\ndrivers/cdx/cdx.c=842=EXPORT_SYMBOL_NS_GPL(cdx_device_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-843-\ndrivers/cdx/cdx.c:844:struct device cdx_bus_add(struct cdx_controller cdx, u8 bus_num)\ndrivers/cdx/cdx.c-845-{\n--\ndrivers/cdx/cdx.c=889=EXPORT_SYMBOL_NS_GPL(cdx_bus_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-890-\ndrivers/cdx/cdx.c:891:int cdx_register_controller(struct cdx_controller cdx)\ndrivers/cdx/cdx.c-892-{\n--\ndrivers/cdx/cdx.c-894-\ndrivers/cdx/cdx.c:895:\tret = ida_alloc_range(\u0026cdx_controller_ida, 0, MAX_CDX_CONTROLLERS - 1, GFP_KERNEL);\ndrivers/cdx/cdx.c-896-\tif (ret \u003c 0) {\n--\ndrivers/cdx/cdx.c-902-\ndrivers/cdx/cdx.c:903:\tmutex_lock(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-904-\tcdx-\u003eid = ret;\n--\ndrivers/cdx/cdx.c-909-\tcdx-\u003econtroller_registered = true;\ndrivers/cdx/cdx.c:910:\tmutex_unlock(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-911-\n--\ndrivers/cdx/cdx.c=914=EXPORT_SYMBOL_NS_GPL(cdx_register_controller, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-915-\ndrivers/cdx/cdx.c:916:void cdx_unregister_controller(struct cdx_controller cdx)\ndrivers/cdx/cdx.c-917-{\n--\ndrivers/cdx/cdx.c-920-\ndrivers/cdx/cdx.c:921:\tmutex_lock(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-922-\n--\ndrivers/cdx/cdx.c-924-\tdevice_for_each_child(cdx-\u003edev, NULL, cdx_unregister_device);\ndrivers/cdx/cdx.c:925:\tida_free(\u0026cdx_controller_ida, cdx-\u003eid);\ndrivers/cdx/cdx.c-926-\ndrivers/cdx/cdx.c:927:\tmutex_unlock(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-928-}\n--\ndrivers/cdx/cdx.h=31=struct cdx_dev_params {\ndrivers/cdx/cdx.h:32:\tstruct cdx_controller cdx;\ndrivers/cdx/cdx.h-33-\tstruct device parent;\n--\ndrivers/cdx/cdx.h-55- /\ndrivers/cdx/cdx.h:56:int cdx_register_controller(struct cdx_controller cdx);\ndrivers/cdx/cdx.h-57-\n--\ndrivers/cdx/cdx.h-61- /\ndrivers/cdx/cdx.h:62:void cdx_unregister_controller(struct cdx_controller cdx);\ndrivers/cdx/cdx.h-63-\n--\ndrivers/cdx/cdx.h=73=int cdx_device_add(struct cdx_dev_params dev_params);\n--\ndrivers/cdx/cdx.h-83- /\ndrivers/cdx/cdx.h:84:struct device cdx_bus_add(struct cdx_controller cdx, u8 bus_num);\ndrivers/cdx/cdx.h-85-\n--\ndrivers/cdx/cdx_msi.c=39=static void cdx_msi_write_irq_unlock(struct irq_data irq_data)\n--\ndrivers/cdx/cdx_msi.c-42-\tstruct cdx_device cdx_dev = to_cdx_device(msi_desc-\u003edev);\ndrivers/cdx/cdx_msi.c:43:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx_msi.c-44-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/cdx_msi.c=68=int cdx_enable_msi(struct cdx_device cdx_dev)\ndrivers/cdx/cdx_msi.c-69-{\ndrivers/cdx/cdx_msi.c:70:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx_msi.c-71-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/cdx_msi.c=84=void cdx_disable_msi(struct cdx_device cdx_dev)\ndrivers/cdx/cdx_msi.c-85-{\ndrivers/cdx/cdx_msi.c:86:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx_msi.c-87-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/controller/Makefile=8=obj-$(CONFIG_CDX_CONTROLLER) += cdx-controller.o\ndrivers/cdx/controller/Makefile:9:cdx-controller-objs := cdx_controller.o cdx_rpmsg.o mcdi.o mcdi_functions.o\n--\ndrivers/cdx/controller/cdx_controller.c-12-\ndrivers/cdx/controller/cdx_controller.c:13:#include \"cdx_controller.h\"\ndrivers/cdx/controller/cdx_controller.c-14-#include \"../cdx.h\"\n--\ndrivers/cdx/controller/cdx_controller.c=31=static const struct cdx_mcdi_ops mcdi_ops = {\n--\ndrivers/cdx/controller/cdx_controller.c-35-\ndrivers/cdx/controller/cdx_controller.c:36:static int cdx_bus_enable(struct cdx_controller cdx, u8 bus_num)\ndrivers/cdx/controller/cdx_controller.c-37-{\n--\ndrivers/cdx/controller/cdx_controller.c-40-\ndrivers/cdx/controller/cdx_controller.c:41:static int cdx_bus_disable(struct cdx_controller cdx, u8 bus_num)\ndrivers/cdx/controller/cdx_controller.c-42-{\n--\ndrivers/cdx/controller/cdx_controller.c-45-\ndrivers/cdx/controller/cdx_controller.c:46:void cdx_rpmsg_post_probe(struct cdx_controller cdx)\ndrivers/cdx/controller/cdx_controller.c-47-{\n--\ndrivers/cdx/controller/cdx_controller.c-52-\ndrivers/cdx/controller/cdx_controller.c:53:void cdx_rpmsg_pre_remove(struct cdx_controller cdx)\ndrivers/cdx/controller/cdx_controller.c-54-{\n--\ndrivers/cdx/controller/cdx_controller.c-58-\ndrivers/cdx/controller/cdx_controller.c:59:static int cdx_configure_device(struct cdx_controller cdx,\ndrivers/cdx/controller/cdx_controller.c-60-\t\t\t\tu8 bus_num, u8 dev_num,\n--\ndrivers/cdx/controller/cdx_controller.c-92-\ndrivers/cdx/controller/cdx_controller.c:93:static int cdx_scan_devices(struct cdx_controller cdx)\ndrivers/cdx/controller/cdx_controller.c-94-{\n--\ndrivers/cdx/controller/cdx_controller.c=164=static int xlnx_cdx_probe(struct platform_device pdev)\ndrivers/cdx/controller/cdx_controller.c-165-{\ndrivers/cdx/controller/cdx_controller.c:166:\tstruct cdx_controller cdx;\ndrivers/cdx/controller/cdx_controller.c-167-\tstruct cdx_mcdi cdx_mcdi;\n--\ndrivers/cdx/controller/cdx_controller.c=222=static void xlnx_cdx_remove(struct platform_device pdev)\ndrivers/cdx/controller/cdx_controller.c-223-{\ndrivers/cdx/controller/cdx_controller.c:224:\tstruct cdx_controller cdx = platform_get_drvdata(pdev);\ndrivers/cdx/controller/cdx_controller.c-225-\tstruct cdx_mcdi cdx_mcdi = cdx-\u003epriv;\n--\ndrivers/cdx/controller/cdx_controller.h-13-\ndrivers/cdx/controller/cdx_controller.h:14:void cdx_rpmsg_post_probe(struct cdx_controller cdx);\ndrivers/cdx/controller/cdx_controller.h-15-\ndrivers/cdx/controller/cdx_controller.h:16:void cdx_rpmsg_pre_remove(struct cdx_controller cdx);\ndrivers/cdx/controller/cdx_controller.h-17-\n--\ndrivers/cdx/controller/cdx_rpmsg.c-15-#include \"../cdx.h\"\ndrivers/cdx/controller/cdx_rpmsg.c:16:#include \"cdx_controller.h\"\ndrivers/cdx/controller/cdx_rpmsg.c-17-#include \"mcdi_functions.h\"\n--\ndrivers/cdx/controller/cdx_rpmsg.c=46=static int cdx_attach_to_rproc(struct platform_device pdev)\n--\ndrivers/cdx/controller/cdx_rpmsg.c-48-\tstruct device_node r5_core_node;\ndrivers/cdx/controller/cdx_rpmsg.c:49:\tstruct cdx_controller cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-50-\tstruct cdx_mcdi cdx_mcdi;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=85=static void cdx_detach_to_r5(struct platform_device pdev)\ndrivers/cdx/controller/cdx_rpmsg.c-86-{\ndrivers/cdx/controller/cdx_rpmsg.c:87:\tstruct cdx_controller cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-88-\tstruct cdx_mcdi cdx_mcdi;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=97=static int cdx_rpmsg_cb(struct rpmsg_device rpdev, void data,\n--\ndrivers/cdx/controller/cdx_rpmsg.c-99-{\ndrivers/cdx/controller/cdx_rpmsg.c:100:\tstruct cdx_controller cdx_c = dev_get_drvdata(\u0026rpdev-\u003edev);\ndrivers/cdx/controller/cdx_rpmsg.c-101-\tstruct cdx_mcdi cdx_mcdi = cdx_c-\u003epriv;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=111=static void cdx_rpmsg_post_probe_work(struct work_struct work)\ndrivers/cdx/controller/cdx_rpmsg.c-112-{\ndrivers/cdx/controller/cdx_rpmsg.c:113:\tstruct cdx_controller cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-114-\tstruct cdx_mcdi cdx_mcdi;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=121=static int cdx_rpmsg_probe(struct rpmsg_device rpdev)\n--\ndrivers/cdx/controller/cdx_rpmsg.c-123-\tstruct rpmsg_channel_info chinfo = {0};\ndrivers/cdx/controller/cdx_rpmsg.c:124:\tstruct cdx_controller cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-125-\tstruct cdx_mcdi cdx_mcdi;\ndrivers/cdx/controller/cdx_rpmsg.c-126-\ndrivers/cdx/controller/cdx_rpmsg.c:127:\tcdx_c = (struct cdx_controller )cdx_rpmsg_id_table[0].driver_data;\ndrivers/cdx/controller/cdx_rpmsg.c-128-\tcdx_mcdi = cdx_c-\u003epriv;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=149=static void cdx_rpmsg_remove(struct rpmsg_device rpdev)\ndrivers/cdx/controller/cdx_rpmsg.c-150-{\ndrivers/cdx/controller/cdx_rpmsg.c:151:\tstruct cdx_controller cdx_c = dev_get_drvdata(\u0026rpdev-\u003edev);\ndrivers/cdx/controller/cdx_rpmsg.c-152-\tstruct cdx_mcdi cdx_mcdi = cdx_c-\u003epriv;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=169=int cdx_setup_rpmsg(struct platform_device pdev)\ndrivers/cdx/controller/cdx_rpmsg.c-170-{\ndrivers/cdx/controller/cdx_rpmsg.c:171:\tstruct cdx_controller cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-172-\tstruct cdx_mcdi *cdx_mcdi;\n" }
13/2	2026/09/04 14:21	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 26702 output: 33 thoughts: 101 Thoughts: CDX Deep Dive Okay, let's get down to brass tacks here. CDX... right. Composable DMA subsystem bus. That rings a bell – definitely in the AMD/Xilinx FPGA/SoC ecosystem. Specifically, it seems to be that crucial link between Versal ACAP/FPGA devices and the R5 core, relying on mechanisms like rpmsg/remoteproc. I'm thinking of communication via platform devices like `xlnx,versal-net-cdx` or related devices. Time to confirm my initial hypothesis. I need to dive into the kernel source tree now. I'll start with those `Kconfig` files – `drivers/cdx/controller/Kconfig` and `drivers/cdx/Kconfig`. That should give me the configuration options, dependencies, and a clearer picture of exactly what components are involved and how this system is architected. That is where the key lies.
14/2	2026/09/04 14:21	tool	read-file	0m Args: { "File": "drivers/cdx/Kconfig", "FirstLine": 1, "LineCount": 40 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0\n 2:\t#\n 3:\t# CDX bus configuration\n 4:\t#\n 5:\t# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.\n 6:\t#\n 7:\t\n 8:\tconfig CDX_BUS\n 9:\t\tbool \"CDX Bus driver\"\n 10:\t\tdepends on OF \u0026\u0026 ARM64 \|\| COMPILE_TEST\n 11:\t\thelp\n 12:\t\t Driver to enable Composable DMA Transfer(CDX) Bus. CDX bus\n 13:\t\t exposes Fabric devices which uses composable DMA IP to the\n 14:\t\t APU. CDX bus provides a mechanism for scanning and probing\n 15:\t\t of CDX devices. CDX devices are memory mapped on system bus\n 16:\t\t for embedded CPUs. CDX bus uses CDX controller and firmware\n 17:\t\t to scan these CDX devices.\n 18:\t\n 19:\tsource \"drivers/cdx/controller/Kconfig\"\n" }
15/2	2026/09/04 14:21	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 27314 output: 35 thoughts: 42 Thoughts: Analyzing CDX_BUS Configuration Okay, let's dive into this `CDX_BUS` configuration. The first thing I need to investigate is that `depends on OF && ARM64 \|\| COMPILE_TEST` directive. That's crucial. I need to understand the implications of it requiring either the presence of the Device Tree, being on an ARM64 architecture, or the `COMPILE_TEST` option being active. Each of these conditions changes the context. Then, to understand the broader implications of `CDX_BUS`, I should really look at the Kconfig file for `drivers/cdx/controller/`. It is likely that the dependencies are clearly laid out there, which I can use to infer the bigger picture.
16/2	2026/09/04 14:21	tool	read-file	0m Args: { "File": "drivers/cdx/controller/Kconfig", "FirstLine": 1, "LineCount": 40 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t#\n 3:\t# CDX controller configuration\n 4:\t#\n 5:\t# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.\n 6:\t#\n 7:\t\n 8:\tif CDX_BUS\n 9:\t\n 10:\tconfig CDX_CONTROLLER\n 11:\t\ttristate \"CDX bus controller\"\n 12:\t\tdepends on HAS_DMA\n 13:\t\tselect REMOTEPROC\n 14:\t\tselect RPMSG\n 15:\t\thelp\n 16:\t\t CDX controller drives the CDX bus. It interacts with\n 17:\t\t firmware to get the hardware devices and registers with\n 18:\t\t the CDX bus. Say Y to enable the CDX hardware driver.\n 19:\t\n 20:\t\t If unsure, say N.\n 21:\t\n 22:\tendif\n" }
17/2	2026/09/04 14:21	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 27808 output: 20 thoughts: 131 Thoughts: Analyzing the CDX Device Integration Okay, so the target architecture is definitely `amd64`, or x86_64, which is straightforward enough. Now, I need to figure out this `CDX_BUS` dependency. It seems like it's tied to `OF && ARM64 \|\| COMPILE_TEST`. That's interesting. The question is, can a CDX device ever realistically be registered or even created in a standard virtualized environment like QEMU on `amd64`, or any common VM, even if `CONFIG_COMPILE_TEST` is enabled? That's a key question here. I need to understand the practicalities. My main point of confusion stems from not knowing how a CDX device is created to begin with. What's the triggering mechanism? Let me drill down and examine the `cdx_device_add` function. I'll need to trace its call sites and understand all the ways devices are actually added to the CDX bus. That will illuminate the whole process. I'll focus on `cdx_device_add` and every single caller of that function. That's the core of where I need to start.
18/2	2026/09/04 14:22	tool	grepper	0m Args: { "Expression": "cdx_device_add" } Results: { "Output": "drivers/cdx/cdx.c=727=static int cdx_create_res_attr(struct cdx_device cdx_dev, int num)\n--\ndrivers/cdx/cdx.c-755-\ndrivers/cdx/cdx.c:756:int cdx_device_add(struct cdx_dev_params dev_params)\ndrivers/cdx/cdx.c-757-{\n--\ndrivers/cdx/cdx.c-841-}\ndrivers/cdx/cdx.c:842:EXPORT_SYMBOL_NS_GPL(cdx_device_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-843-\n--\ndrivers/cdx/cdx.h=62=void cdx_unregister_controller(struct cdx_controller cdx);\n--\ndrivers/cdx/cdx.h-64-/\ndrivers/cdx/cdx.h:65: cdx_device_add - Add a CDX device. This function adds a CDX device\ndrivers/cdx/cdx.h-66- \t\ton the CDX bus as per the device parameters provided\n--\ndrivers/cdx/cdx.h-72- /\ndrivers/cdx/cdx.h:73:int cdx_device_add(struct cdx_dev_params dev_params);\ndrivers/cdx/cdx.h-74-\n--\ndrivers/cdx/controller/cdx_controller.c=93=static int cdx_scan_devices(struct cdx_controller cdx)\n--\ndrivers/cdx/controller/cdx_controller.c-141-\t\t\t/* Add the device to the cdx bus */\ndrivers/cdx/controller/cdx_controller.c:142:\t\t\tret = cdx_device_add(\u0026dev_params);\ndrivers/cdx/controller/cdx_controller.c-143-\t\t\tif (ret) {\n" }
19/2	2026/09/04 14:22	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 28710 output: 42 thoughts: 71 Thoughts: My Investigation into cdx_device_add Okay, so `cdx_device_add` – I need to understand this function. The code tells me it's only called by `cdx_scan_devices`, and that's found within `drivers/cdx/controller/cdx_controller.c`. That's a good starting point, right? To really grasp what's happening, I need to understand how the `cdx_controller` is probed in the first place. That will give me the context for when and why `cdx_device_add` gets called. So, I'm going to start by diving into `drivers/cdx/controller/cdx_controller.c` and see what the probing setup looks like.
20/2	2026/09/04 14:22	tool	read-file	0m Args: { "File": "drivers/cdx/controller/cdx_controller.c", "FirstLine": 160, "LineCount": 100 } Results: { "Contents": " 160:\t\t.scan\t\t= cdx_scan_devices,\n 161:\t\t.dev_configure\t= cdx_configure_device,\n 162:\t};\n 163:\t\n 164:\tstatic int xlnx_cdx_probe(struct platform_device pdev)\n 165:\t{\n 166:\t\tstruct cdx_controller cdx;\n 167:\t\tstruct cdx_mcdi cdx_mcdi;\n 168:\t\tint ret;\n 169:\t\n 170:\t\tcdx_mcdi = kzalloc_obj(cdx_mcdi);\n 171:\t\tif (!cdx_mcdi)\n 172:\t\t\treturn -ENOMEM;\n 173:\t\n 174:\t\t/* Store the MCDI ops /\n 175:\t\tcdx_mcdi-\u003emcdi_ops = \u0026mcdi_ops;\n 176:\t\t/ MCDI FW: Initialize the FW path /\n 177:\t\tret = cdx_mcdi_init(cdx_mcdi);\n 178:\t\tif (ret) {\n 179:\t\t\tdev_err_probe(\u0026pdev-\u003edev, ret, \"MCDI Initialization failed\\n\");\n 180:\t\t\tgoto mcdi_init_fail;\n 181:\t\t}\n 182:\t\n 183:\t\tcdx = kzalloc_obj(cdx);\n 184:\t\tif (!cdx) {\n 185:\t\t\tret = -ENOMEM;\n 186:\t\t\tgoto cdx_alloc_fail;\n 187:\t\t}\n 188:\t\tplatform_set_drvdata(pdev, cdx);\n 189:\t\n 190:\t\tcdx-\u003edev = \u0026pdev-\u003edev;\n 191:\t\tcdx-\u003epriv = cdx_mcdi;\n 192:\t\tcdx-\u003eops = \u0026cdx_ops;\n 193:\t\n 194:\t\t/* Create MSI domain /\n 195:\t\tif (IS_ENABLED(CONFIG_GENERIC_MSI_IRQ))\n 196:\t\t\tcdx-\u003emsi_domain = cdx_msi_domain_init(\u0026pdev-\u003edev);\n 197:\t\tif (!cdx-\u003emsi_domain) {\n 198:\t\t\tret = dev_err_probe(\u0026pdev-\u003edev, -ENODEV, \"cdx_msi_domain_init() failed\");\n 199:\t\t\tgoto cdx_msi_fail;\n 200:\t\t}\n 201:\t\n 202:\t\tret = cdx_setup_rpmsg(pdev);\n 203:\t\tif (ret) {\n 204:\t\t\tdev_err_probe(\u0026pdev-\u003edev, ret, \"Failed to register CDX RPMsg transport\\n\");\n 205:\t\t\tgoto cdx_rpmsg_fail;\n 206:\t\t}\n 207:\t\n 208:\t\treturn 0;\n 209:\t\n 210:\tcdx_rpmsg_fail:\n 211:\t\tirq_domain_remove(cdx-\u003emsi_domain);\n 212:\tcdx_msi_fail:\n 213:\t\tkfree(cdx);\n 214:\tcdx_alloc_fail:\n 215:\t\tcdx_mcdi_finish(cdx_mcdi);\n 216:\tmcdi_init_fail:\n 217:\t\tkfree(cdx_mcdi);\n 218:\t\n 219:\t\treturn ret;\n 220:\t}\n 221:\t\n 222:\tstatic void xlnx_cdx_remove(struct platform_device pdev)\n 223:\t{\n 224:\t\tstruct cdx_controller cdx = platform_get_drvdata(pdev);\n 225:\t\tstruct cdx_mcdi cdx_mcdi = cdx-\u003epriv;\n 226:\t\n 227:\t\tcdx_destroy_rpmsg(pdev);\n 228:\t\n 229:\t\tirq_domain_remove(cdx-\u003emsi_domain);\n 230:\t\tkfree(cdx);\n 231:\t\n 232:\t\tcdx_mcdi_finish(cdx_mcdi);\n 233:\t\tkfree(cdx_mcdi);\n 234:\t}\n 235:\t\n 236:\tstatic const struct of_device_id cdx_match_table[] = {\n 237:\t\t{.compatible = \"xlnx,versal-net-cdx\",},\n 238:\t\t{ },\n 239:\t};\n 240:\t\n 241:\tMODULE_DEVICE_TABLE(of, cdx_match_table);\n 242:\t\n 243:\tstatic struct platform_driver cdx_pdriver = {\n 244:\t\t.driver = {\n 245:\t\t\t .name = \"cdx-controller\",\n 246:\t\t\t .of_match_table = cdx_match_table,\n 247:\t\t\t },\n 248:\t\t.probe = xlnx_cdx_probe,\n 249:\t\t.remove = xlnx_cdx_remove,\n 250:\t};\n 251:\t\n 252:\tmodule_platform_driver(cdx_pdriver);\n 253:\t\n 254:\tMODULE_AUTHOR(\"AMD Inc.\");\n 255:\tMODULE_DESCRIPTION(\"CDX controller for AMD devices\");\n 256:\tMODULE_LICENSE(\"GPL\");\n 257:\tMODULE_IMPORT_NS(\"CDX_BUS_CONTROLLER\");\n" }
21/2	2026/09/04 14:22	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 30489 output: 37 thoughts: 47 Thoughts: Here's my analysis of the provided information, as if these were my internal thoughts: VFIO CDX Driver Investigation Okay, so we're looking at the VFIO driver for CDX bus devices – that's a good starting point. The file in question is `drivers/vfio/cdx/main.c`. My immediate instinct is to dive into that file and see what it's doing. `main.c` is usually the core, so it'll probably contain the essential initialization, device handling, and entry points for this VFIO driver. I need to understand how it's interacting with the CDX bus specifically, and how it's exposing that to the VFIO framework. I'll be looking for things like initialization routines, how it handles device discovery, how it sets up DMA mappings, and how it handles interrupts. This will give me a good handle on how this driver facilitates virtualized access to CDX devices. Let's get reading!
22/2	2026/09/04 14:22	tool	read-file	0m Args: { "File": "drivers/vfio/cdx/main.c", "FirstLine": 1, "LineCount": 80 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0\n 2:\t/\n 3:\t Copyright (C) 2022-2023, Advanced Micro Devices, Inc.\n 4:\t /\n 5:\t\n 6:\t#include \u003clinux/vfio.h\u003e\n 7:\t#include \u003clinux/cdx/cdx_bus.h\u003e\n 8:\t\n 9:\t#include \"private.h\"\n 10:\t\n 11:\tstatic int vfio_cdx_init_dev(struct vfio_device core_vdev)\n 12:\t{\n 13:\t\tstruct vfio_cdx_device vdev =\n 14:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n 15:\t\n 16:\t\tmutex_init(\u0026vdev-\u003ecdx_irqs_lock);\n 17:\t\treturn 0;\n 18:\t}\n 19:\t\n 20:\tstatic void vfio_cdx_release_dev(struct vfio_device core_vdev)\n 21:\t{\n 22:\t\tstruct vfio_cdx_device vdev =\n 23:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n 24:\t\n 25:\t\tmutex_destroy(\u0026vdev-\u003ecdx_irqs_lock);\n 26:\t}\n 27:\t\n 28:\tstatic int vfio_cdx_open_device(struct vfio_device core_vdev)\n 29:\t{\n 30:\t\tstruct vfio_cdx_device vdev =\n 31:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n 32:\t\tstruct cdx_device cdx_dev = to_cdx_device(core_vdev-\u003edev);\n 33:\t\tint count = cdx_dev-\u003eres_count;\n 34:\t\tint i, ret;\n 35:\t\n 36:\t\tvdev-\u003eregions = kzalloc_objs(struct vfio_cdx_region, count,\n 37:\t\t\t\t\t GFP_KERNEL_ACCOUNT);\n 38:\t\tif (!vdev-\u003eregions)\n 39:\t\t\treturn -ENOMEM;\n 40:\t\n 41:\t\tfor (i = 0; i \u003c count; i++) {\n 42:\t\t\tstruct resource res = \u0026cdx_dev-\u003eres[i];\n 43:\t\n 44:\t\t\tvdev-\u003eregions[i].addr = res-\u003estart;\n 45:\t\t\tvdev-\u003eregions[i].size = resource_size(res);\n 46:\t\t\tvdev-\u003eregions[i].type = res-\u003eflags;\n 47:\t\t\t/\n 48:\t\t\t * Only regions addressed with PAGE granularity may be\n 49:\t\t\t * MMAP'ed securely.\n 50:\t\t\t /\n 51:\t\t\tif (!(vdev-\u003eregions[i].addr \u0026 ~PAGE_MASK) \u0026\u0026\n 52:\t\t\t !(vdev-\u003eregions[i].size \u0026 ~PAGE_MASK))\n 53:\t\t\t\tvdev-\u003eregions[i].flags \|=\n 54:\t\t\t\t\t\tVFIO_REGION_INFO_FLAG_MMAP;\n 55:\t\t\tvdev-\u003eregions[i].flags \|= VFIO_REGION_INFO_FLAG_READ;\n 56:\t\t\tif (!(cdx_dev-\u003eres[i].flags \u0026 IORESOURCE_READONLY))\n 57:\t\t\t\tvdev-\u003eregions[i].flags \|= VFIO_REGION_INFO_FLAG_WRITE;\n 58:\t\t}\n 59:\t\tret = cdx_dev_reset(core_vdev-\u003edev);\n 60:\t\tif (ret) {\n 61:\t\t\tkfree(vdev-\u003eregions);\n 62:\t\t\tvdev-\u003eregions = NULL;\n 63:\t\t\treturn ret;\n 64:\t\t}\n 65:\t\tret = cdx_clear_master(cdx_dev);\n 66:\t\tif (ret)\n 67:\t\t\tvdev-\u003eflags \u0026= ~BME_SUPPORT;\n 68:\t\telse\n 69:\t\t\tvdev-\u003eflags \|= BME_SUPPORT;\n 70:\t\n 71:\t\treturn 0;\n 72:\t}\n 73:\t\n 74:\tstatic void vfio_cdx_close_device(struct vfio_device core_vdev)\n 75:\t{\n 76:\t\tstruct vfio_cdx_device *vdev =\n 77:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n 78:\t\n 79:\t\tkfree(vdev-\u003eregions);\n 80:\t\tcdx_dev_reset(core_vdev-\u003edev);\n" }
23/2	2026/09/04 14:22	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 31989 output: 39 thoughts: 19 Thoughts: Okay, here's my interpretation of what's going on, formatted as you requested: Digging into the VFIO CDX Code Alright, time to dive deeper. I'm going to head into the `drivers/vfio/cdx/main.c` file. This is where the core of the CDX (Container Direct eXchange) implementation within VFIO (Virtual Function I/O) likely resides. My expectation is that this file will contain the fundamental logic for how the CDX device is initialized, how it handles requests, how it interacts with the underlying hardware, and how it's integrated within the VFIO framework. I'll be looking for things like initialization routines, interrupt handling, memory mapping functions, and the core request dispatch loop. I want to see how the software interacts with the hardware, what data structures are used to represent the CDX device, and how it handles potential errors. Understanding this `main.c` file is going to be crucial for figuring out the inner workings of the CDX implementation and how it fits into the broader VFIO architecture. This will be the key to understanding its performance characteristics and potential areas for optimization or debugging.
24/2	2026/09/04 14:22	tool	read-file	0m Args: { "File": "drivers/vfio/cdx/main.c", "FirstLine": 240, "LineCount": 80 } Results: { "Contents": " 240:\t\t\treturn -ENOTTY;\n 241:\t\t}\n 242:\t}\n 243:\t\n 244:\tstatic int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,\n 245:\t\t\t\t struct vm_area_struct vma)\n 246:\t{\n 247:\t\tu64 size = vma-\u003evm_end - vma-\u003evm_start;\n 248:\t\tu64 pgoff, base;\n 249:\t\n 250:\t\tpgoff = vma-\u003evm_pgoff \u0026\n 251:\t\t\t((1U \u003c\u003c (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT)) - 1);\n 252:\t\tbase = pgoff \u003c\u003c PAGE_SHIFT;\n 253:\t\n 254:\t\tif (base + size \u003e region.size)\n 255:\t\t\treturn -EINVAL;\n 256:\t\n 257:\t\tvma-\u003evm_page_prot = pgprot_device(vma-\u003evm_page_prot);\n 258:\t\n 259:\t\treturn io_remap_pfn_range(vma, vma-\u003evm_start,\n 260:\t\t\t\t\t (region.addr \u003e\u003e PAGE_SHIFT) + pgoff,\n 261:\t\t\t\t\t size, vma-\u003evm_page_prot);\n 262:\t}\n 263:\t\n 264:\tstatic int vfio_cdx_mmap(struct vfio_device core_vdev,\n 265:\t\t\t\t struct vm_area_struct vma)\n 266:\t{\n 267:\t\tstruct vfio_cdx_device vdev =\n 268:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n 269:\t\tstruct cdx_device cdx_dev = to_cdx_device(core_vdev-\u003edev);\n 270:\t\tunsigned int index;\n 271:\t\n 272:\t\tindex = vma-\u003evm_pgoff \u003e\u003e (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT);\n 273:\t\n 274:\t\tif (index \u003e= cdx_dev-\u003eres_count)\n 275:\t\t\treturn -EINVAL;\n 276:\t\n 277:\t\tif (!(vdev-\u003eregions[index].flags \u0026 VFIO_REGION_INFO_FLAG_MMAP))\n 278:\t\t\treturn -EINVAL;\n 279:\t\n 280:\t\tif (!(vdev-\u003eregions[index].flags \u0026 VFIO_REGION_INFO_FLAG_READ) \u0026\u0026\n 281:\t\t (vma-\u003evm_flags \u0026 VM_READ))\n 282:\t\t\treturn -EPERM;\n 283:\t\n 284:\t\tif (!(vdev-\u003eregions[index].flags \u0026 VFIO_REGION_INFO_FLAG_WRITE) \u0026\u0026\n 285:\t\t (vma-\u003evm_flags \u0026 VM_WRITE))\n 286:\t\t\treturn -EPERM;\n 287:\t\n 288:\t\treturn vfio_cdx_mmap_mmio(vdev-\u003eregions[index], vma);\n 289:\t}\n 290:\t\n 291:\tstatic const struct vfio_device_ops vfio_cdx_ops = {\n 292:\t\t.name\t\t= \"vfio-cdx\",\n 293:\t\t.init\t\t= vfio_cdx_init_dev,\n 294:\t\t.release\t= vfio_cdx_release_dev,\n 295:\t\t.open_device\t= vfio_cdx_open_device,\n 296:\t\t.close_device\t= vfio_cdx_close_device,\n 297:\t\t.ioctl\t\t= vfio_cdx_ioctl,\n 298:\t\t.get_region_info_caps = vfio_cdx_ioctl_get_region_info,\n 299:\t\t.device_feature = vfio_cdx_ioctl_feature,\n 300:\t\t.mmap\t\t= vfio_cdx_mmap,\n 301:\t\t.bind_iommufd\t= vfio_iommufd_physical_bind,\n 302:\t\t.unbind_iommufd\t= vfio_iommufd_physical_unbind,\n 303:\t\t.attach_ioas\t= vfio_iommufd_physical_attach_ioas,\n 304:\t};\n 305:\t\n 306:\tstatic int vfio_cdx_probe(struct cdx_device cdx_dev)\n 307:\t{\n 308:\t\tstruct vfio_cdx_device vdev;\n 309:\t\tstruct device dev = \u0026cdx_dev-\u003edev;\n 310:\t\tint ret;\n 311:\t\n 312:\t\tvdev = vfio_alloc_device(vfio_cdx_device, vdev, dev,\n 313:\t\t\t\t\t \u0026vfio_cdx_ops);\n 314:\t\tif (IS_ERR(vdev))\n 315:\t\t\treturn PTR_ERR(vdev);\n 316:\t\n 317:\t\tret = vfio_register_group_dev(\u0026vdev-\u003evdev);\n 318:\t\tif (ret)\n 319:\t\t\tgoto out_uninit;\n" }
25/2	2026/09/04 14:22	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 33691 output: 20 thoughts: 89 Thoughts: Okay, here's my take on those thoughts, framed from my expert perspective: Investigating the `vfio_cdx` Driver Alright, so `vfio_cdx` is triggered, as expected, when a `cdx_device` structure aligns with the `vfio_cdx_driver`. My immediate thought is, "Okay, that's the setup, but what's actually happening with this CDX thing?". I need to understand the architectural landscape. First, I'm going to quickly check for any sort of emulated or mocked implementations of CDX buses or devices within the Linux kernel itself, and of course, QEMU is a logical place to look. I'm thinking, are we talking about a real, physical device, or is this something virtualized, or perhaps a test harness? Finding mock implementations is critical for understanding the intent. Then, I'll perform a broader search, a deeper dive into the kernel source. I'm going to throw a "cdx" search string across the whole codebase. I want to identify any other code that's responsible for registering either a CDX controller or a CDX device. This will help me understand the overall subsystem architecture, and how the `vfio_cdx` driver fits into the picture. Finding the registration points will let me see where this CDX technology originates from within the system. That should give me a solid handle on how it's used.
26/2	2026/09/04 14:22	tool	grepper	0m Args: { "Expression": "cdx_driver_register" } Results: { "Output": "drivers/cdx/cdx.c=628=EXPORT_SYMBOL_GPL(cdx_bus_type);\ndrivers/cdx/cdx.c-629-\ndrivers/cdx/cdx.c:630:int __cdx_driver_register(struct cdx_driver cdx_driver,\ndrivers/cdx/cdx.c-631-\t\t\t struct module owner)\n--\ndrivers/cdx/cdx.c-646-}\ndrivers/cdx/cdx.c:647:EXPORT_SYMBOL_GPL(__cdx_driver_register);\ndrivers/cdx/cdx.c-648-\n--\ndrivers/vfio/cdx/main.c=348=static struct cdx_driver vfio_cdx_driver = {\n--\ndrivers/vfio/cdx/main.c-357-\ndrivers/vfio/cdx/main.c:358:module_driver(vfio_cdx_driver, cdx_driver_register, cdx_driver_unregister);\ndrivers/vfio/cdx/main.c-359-\n--\ninclude/linux/cdx/cdx_bus.h=198=struct cdx_driver {\n--\ninclude/linux/cdx/cdx_bus.h-212-/* Macro to avoid include chaining to get THIS_MODULE /\ninclude/linux/cdx/cdx_bus.h:213:#define cdx_driver_register(drv) \\\ninclude/linux/cdx/cdx_bus.h:214:\t__cdx_driver_register(drv, THIS_MODULE)\ninclude/linux/cdx/cdx_bus.h-215-\ninclude/linux/cdx/cdx_bus.h-216-/\ninclude/linux/cdx/cdx_bus.h:217: __cdx_driver_register - registers a CDX device driver\ninclude/linux/cdx/cdx_bus.h-218- * @cdx_driver: CDX driver to register\n--\ninclude/linux/cdx/cdx_bus.h-222- /\ninclude/linux/cdx/cdx_bus.h:223:int __must_check __cdx_driver_register(struct cdx_driver cdx_driver,\ninclude/linux/cdx/cdx_bus.h-224-\t\t\t\t struct module *owner);\n" }
27/2	2026/09/04 14:22	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 34715 output: 19 thoughts: 51 Thoughts: Okay, let's get down to brass tacks. Investigating `cdx_driver` Usage Alright, I need to get a clear picture of how this `cdx_driver` structure and `cdx_driver_register` function are being utilized throughout the kernel. My initial thought is to identify all the other drivers that are employing these elements. I'll need to do a thorough code search. The most direct approach is a grep for instances of `struct cdx_driver` and `cdx_driver` (case-insensitive perhaps, but let's start with case sensitive) across the entire kernel source tree. This should reveal all relevant locations where these are defined, referenced, or used. This granular approach should give me a complete overview of the existing ecosystem relying on this construct. With this info, I can then determine the best path forward.
28/2	2026/09/04 14:22	tool	grepper	0m Args: { "Expression": "struct cdx_driver" } Results: { "Output": "drivers/cdx/cdx.c=95=int cdx_dev_reset(struct device dev)\n--\ndrivers/cdx/cdx.c-99-\tstruct cdx_device_config dev_config = {0};\ndrivers/cdx/cdx.c:100:\tstruct cdx_driver cdx_drv;\ndrivers/cdx/cdx.c-101-\tint ret;\n--\ndrivers/cdx/cdx.c=263=static int cdx_bus_match(struct device dev, const struct device_driver drv)\n--\ndrivers/cdx/cdx.c-265-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:266:\tconst struct cdx_driver cdx_drv = to_cdx_driver(drv);\ndrivers/cdx/cdx.c-267-\tconst struct cdx_device_id found_id = NULL;\n--\ndrivers/cdx/cdx.c=302=static int cdx_probe(struct device dev)\ndrivers/cdx/cdx.c-303-{\ndrivers/cdx/cdx.c:304:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-305-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\n--\ndrivers/cdx/cdx.c=328=static void cdx_remove(struct device dev)\ndrivers/cdx/cdx.c-329-{\ndrivers/cdx/cdx.c:330:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-331-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\n--\ndrivers/cdx/cdx.c=337=static void cdx_shutdown(struct device dev)\ndrivers/cdx/cdx.c-338-{\ndrivers/cdx/cdx.c:339:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-340-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\n--\ndrivers/cdx/cdx.c=349=static int cdx_dma_configure(struct device dev)\ndrivers/cdx/cdx.c-350-{\ndrivers/cdx/cdx.c:351:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-352-\tstruct cdx_device cdx_dev = to_cdx_device(dev);\n--\ndrivers/cdx/cdx.c=373=static void cdx_dma_cleanup(struct device dev)\ndrivers/cdx/cdx.c-374-{\ndrivers/cdx/cdx.c:375:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-376-\n--\ndrivers/cdx/cdx.c=628=EXPORT_SYMBOL_GPL(cdx_bus_type);\ndrivers/cdx/cdx.c-629-\ndrivers/cdx/cdx.c:630:int __cdx_driver_register(struct cdx_driver cdx_driver,\ndrivers/cdx/cdx.c-631-\t\t\t struct module owner)\n--\ndrivers/cdx/cdx.c=647=EXPORT_SYMBOL_GPL(__cdx_driver_register);\ndrivers/cdx/cdx.c-648-\ndrivers/cdx/cdx.c:649:void cdx_driver_unregister(struct cdx_driver cdx_driver)\ndrivers/cdx/cdx.c-650-{\n--\ndrivers/vfio/cdx/main.c=346=MODULE_DEVICE_TABLE(cdx, vfio_cdx_table);\ndrivers/vfio/cdx/main.c-347-\ndrivers/vfio/cdx/main.c:348:static struct cdx_driver vfio_cdx_driver = {\ndrivers/vfio/cdx/main.c-349-\t.probe\t\t= vfio_cdx_probe,\n--\ninclude/linux/cdx/cdx_bus.h=143=struct cdx_device {\n--\ninclude/linux/cdx/cdx_bus.h-181-/*\ninclude/linux/cdx/cdx_bus.h:182: struct cdx_driver - CDX device driver\ninclude/linux/cdx/cdx_bus.h-183- * @driver: Generic device driver\n--\ninclude/linux/cdx/cdx_bus.h-197- /\ninclude/linux/cdx/cdx_bus.h:198:struct cdx_driver {\ninclude/linux/cdx/cdx_bus.h-199-\tstruct device_driver driver;\n--\ninclude/linux/cdx/cdx_bus.h-209-#define to_cdx_driver(_drv) \\\ninclude/linux/cdx/cdx_bus.h:210:\tcontainer_of_const(_drv, struct cdx_driver, driver)\ninclude/linux/cdx/cdx_bus.h-211-\n--\ninclude/linux/cdx/cdx_bus.h-222- /\ninclude/linux/cdx/cdx_bus.h:223:int __must_check __cdx_driver_register(struct cdx_driver cdx_driver,\ninclude/linux/cdx/cdx_bus.h-224-\t\t\t\t struct module owner);\n--\ninclude/linux/cdx/cdx_bus.h-230- /\ninclude/linux/cdx/cdx_bus.h:231:void cdx_driver_unregister(struct cdx_driver cdx_driver);\ninclude/linux/cdx/cdx_bus.h-232-\n" }
29/2	2026/09/04 14:22	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 36551 output: 32 thoughts: 178 Thoughts: My Assessment of the VFIO-CDX Driver Okay, here's how I'm thinking through this. My starting point is the `vfio_cdx_driver`, which is registered when the `vfio-cdx` module loads. Makes perfect sense. However, I need to understand the full path to how a function like `vfio_cdx_mmap_mmio`, or any of the `vfio_cdx_` functions, actually gets called*. The critical path seems to be that a `cdx_device` has to exist and be bound to `vfio-cdx`. Then, a user-space process must open the VFIO device and call `mmap()`. That's the expected usage. Now, I need to know if I can even create a `cdx_device` in the absence of actual hardware. My intuition tells me this should be possible for testing and emulation purposes. I need to dig into the `drivers/cdx/cdx.c` file to see how these devices are created. Specifically, I'm checking if there's any sysfs interface that allows the creation or "mocking" of CDX devices, or if their creation is entirely dependent on a `cdx_controller`. I need to figure out what's going on in `drivers/cdx/cdx.c`.
30/2	2026/09/04 14:22	tool	grepper	0m Args: { "Expression": "cdx_", "PathPrefix": "drivers/cdx/cdx.c" } Results: { "Output": "\nFull output is too long, showing 500 out of 665 lines.\nUse more precise expression if possible.\n\ndrivers/cdx/cdx.c-67-#include \u003clinux/idr.h\u003e\ndrivers/cdx/cdx.c:68:#include \u003clinux/cdx/cdx_bus.h\u003e\ndrivers/cdx/cdx.c-69-#include \u003clinux/iommu.h\u003e\n--\ndrivers/cdx/cdx.c-78-/* IDA for CDX controllers registered with the CDX bus /\ndrivers/cdx/cdx.c:79:static DEFINE_IDA(cdx_controller_ida);\ndrivers/cdx/cdx.c-80-/ Lock to protect controller ops /\ndrivers/cdx/cdx.c:81:static DEFINE_MUTEX(cdx_controller_lock);\ndrivers/cdx/cdx.c-82-/ Debugfs dir for cdx bus /\ndrivers/cdx/cdx.c:83:static struct dentry cdx_debugfs_dir;\ndrivers/cdx/cdx.c-84-\ndrivers/cdx/cdx.c=85=static char compat_node_name = \"xlnx,versal-net-cdx\";\ndrivers/cdx/cdx.c-86-\ndrivers/cdx/cdx.c:87:static void cdx_destroy_res_attr(struct cdx_device cdx_dev, int num);\ndrivers/cdx/cdx.c-88-\ndrivers/cdx/cdx.c-89-/*\ndrivers/cdx/cdx.c:90: cdx_dev_reset - Reset a CDX device\ndrivers/cdx/cdx.c-91- * @dev: CDX device\n--\ndrivers/cdx/cdx.c-94- /\ndrivers/cdx/cdx.c:95:int cdx_dev_reset(struct device dev)\ndrivers/cdx/cdx.c-96-{\ndrivers/cdx/cdx.c:97:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:98:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c:99:\tstruct cdx_device_config dev_config = {0};\ndrivers/cdx/cdx.c:100:\tstruct cdx_driver cdx_drv;\ndrivers/cdx/cdx.c-101-\tint ret;\ndrivers/cdx/cdx.c-102-\ndrivers/cdx/cdx.c:103:\tcdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-104-\t/ Notify driver that device is being reset /\ndrivers/cdx/cdx.c:105:\tif (cdx_drv \u0026\u0026 cdx_drv-\u003ereset_prepare)\ndrivers/cdx/cdx.c:106:\t\tcdx_drv-\u003ereset_prepare(cdx_dev);\ndrivers/cdx/cdx.c-107-\ndrivers/cdx/cdx.c-108-\tdev_config.type = CDX_DEV_RESET_CONF;\ndrivers/cdx/cdx.c:109:\tret = cdx-\u003eops-\u003edev_configure(cdx, cdx_dev-\u003ebus_num,\ndrivers/cdx/cdx.c:110:\t\t\t\t cdx_dev-\u003edev_num, \u0026dev_config);\ndrivers/cdx/cdx.c-111-\tif (ret)\n--\ndrivers/cdx/cdx.c-114-\t/ Notify driver that device reset is complete /\ndrivers/cdx/cdx.c:115:\tif (cdx_drv \u0026\u0026 cdx_drv-\u003ereset_done)\ndrivers/cdx/cdx.c:116:\t\tcdx_drv-\u003ereset_done(cdx_dev);\ndrivers/cdx/cdx.c-117-\n--\ndrivers/cdx/cdx.c-119-}\ndrivers/cdx/cdx.c:120:EXPORT_SYMBOL_GPL(cdx_dev_reset);\ndrivers/cdx/cdx.c-121-\ndrivers/cdx/cdx.c-122-/\ndrivers/cdx/cdx.c:123: reset_cdx_device - Reset a CDX device\ndrivers/cdx/cdx.c-124- * @dev: CDX device\n--\ndrivers/cdx/cdx.c-130- /\ndrivers/cdx/cdx.c:131:static int reset_cdx_device(struct device dev, void data)\ndrivers/cdx/cdx.c-132-{\ndrivers/cdx/cdx.c:133:\treturn cdx_dev_reset(dev);\ndrivers/cdx/cdx.c-134-}\n--\ndrivers/cdx/cdx.c-136-/\ndrivers/cdx/cdx.c:137: cdx_unregister_device - Unregister a CDX device\ndrivers/cdx/cdx.c-138- * @dev: CDX device\n--\ndrivers/cdx/cdx.c-140- \t but is required here as the bus_for_each_dev() API expects\ndrivers/cdx/cdx.c:141: \t the passed function (cdx_unregister_device) to have this\ndrivers/cdx/cdx.c-142- \t as an argument.\n--\ndrivers/cdx/cdx.c-145- /\ndrivers/cdx/cdx.c:146:static int cdx_unregister_device(struct device dev,\ndrivers/cdx/cdx.c-147-\t\t\t\t void data)\ndrivers/cdx/cdx.c-148-{\ndrivers/cdx/cdx.c:149:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:150:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-151-\ndrivers/cdx/cdx.c:152:\tif (cdx_dev-\u003eis_bus) {\ndrivers/cdx/cdx.c:153:\t\tdevice_for_each_child(dev, NULL, cdx_unregister_device);\ndrivers/cdx/cdx.c:154:\t\tif (cdx_dev-\u003eenabled \u0026\u0026 cdx-\u003eops-\u003ebus_disable)\ndrivers/cdx/cdx.c:155:\t\t\tcdx-\u003eops-\u003ebus_disable(cdx, cdx_dev-\u003ebus_num);\ndrivers/cdx/cdx.c-156-\t} else {\ndrivers/cdx/cdx.c:157:\t\tcdx_destroy_res_attr(cdx_dev, MAX_CDX_DEV_RESOURCES);\ndrivers/cdx/cdx.c:158:\t\tdebugfs_remove_recursive(cdx_dev-\u003edebugfs_dir);\ndrivers/cdx/cdx.c-159-\t}\n--\ndrivers/cdx/cdx.c-161-\t/\ndrivers/cdx/cdx.c:162:\t Do not free cdx_dev here as it would be freed in\ndrivers/cdx/cdx.c:163:\t * cdx_device_release() called from within put_device().\ndrivers/cdx/cdx.c-164-\t /\ndrivers/cdx/cdx.c:165:\tdevice_del(\u0026cdx_dev-\u003edev);\ndrivers/cdx/cdx.c:166:\tput_device(\u0026cdx_dev-\u003edev);\ndrivers/cdx/cdx.c-167-\n--\ndrivers/cdx/cdx.c-170-\ndrivers/cdx/cdx.c:171:static void cdx_unregister_devices(const struct bus_type bus)\ndrivers/cdx/cdx.c-172-{\ndrivers/cdx/cdx.c-173-\t/* Reset all the devices attached to cdx bus /\ndrivers/cdx/cdx.c:174:\tbus_for_each_dev(bus, NULL, NULL, cdx_unregister_device);\ndrivers/cdx/cdx.c-175-}\n--\ndrivers/cdx/cdx.c-177-/\ndrivers/cdx/cdx.c:178: cdx_match_one_device - Tell if a CDX device structure has a matching\ndrivers/cdx/cdx.c-179- \t\t\t CDX device id structure\n--\ndrivers/cdx/cdx.c-182- \ndrivers/cdx/cdx.c:183: * Return: matching cdx_device_id structure or NULL if there is no match.\ndrivers/cdx/cdx.c-184- /\ndrivers/cdx/cdx.c:185:static inline const struct cdx_device_id \ndrivers/cdx/cdx.c:186:cdx_match_one_device(const struct cdx_device_id id,\ndrivers/cdx/cdx.c:187:\t\t const struct cdx_device dev)\ndrivers/cdx/cdx.c-188-{\n--\ndrivers/cdx/cdx.c-199-/*\ndrivers/cdx/cdx.c:200: cdx_match_id - See if a CDX device matches a given cdx_id table\ndrivers/cdx/cdx.c-201- * @ids: array of CDX device ID structures to search in\n--\ndrivers/cdx/cdx.c-204- * Used by a driver to check whether a CDX device is in its list of\ndrivers/cdx/cdx.c:205: * supported devices. Returns the matching cdx_device_id structure or\ndrivers/cdx/cdx.c-206- * NULL if there is no match.\ndrivers/cdx/cdx.c-207- \ndrivers/cdx/cdx.c:208: Return: matching cdx_device_id structure or NULL if there is no match.\ndrivers/cdx/cdx.c-209- /\ndrivers/cdx/cdx.c:210:static inline const struct cdx_device_id \ndrivers/cdx/cdx.c:211:cdx_match_id(const struct cdx_device_id ids, struct cdx_device dev)\ndrivers/cdx/cdx.c-212-{\n--\ndrivers/cdx/cdx.c-214-\t\twhile (ids-\u003evendor \|\| ids-\u003edevice) {\ndrivers/cdx/cdx.c:215:\t\t\tif (cdx_match_one_device(ids, dev))\ndrivers/cdx/cdx.c-216-\t\t\t\treturn ids;\n--\ndrivers/cdx/cdx.c-222-\ndrivers/cdx/cdx.c:223:int cdx_set_master(struct cdx_device cdx_dev)\ndrivers/cdx/cdx.c-224-{\ndrivers/cdx/cdx.c:225:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c:226:\tstruct cdx_device_config dev_config;\ndrivers/cdx/cdx.c-227-\tint ret = -EOPNOTSUPP;\n--\ndrivers/cdx/cdx.c-231-\tif (cdx-\u003eops-\u003edev_configure)\ndrivers/cdx/cdx.c:232:\t\tret = cdx-\u003eops-\u003edev_configure(cdx, cdx_dev-\u003ebus_num,\ndrivers/cdx/cdx.c:233:\t\t\t\t\t cdx_dev-\u003edev_num, \u0026dev_config);\ndrivers/cdx/cdx.c-234-\n--\ndrivers/cdx/cdx.c-236-}\ndrivers/cdx/cdx.c:237:EXPORT_SYMBOL_GPL(cdx_set_master);\ndrivers/cdx/cdx.c-238-\ndrivers/cdx/cdx.c:239:int cdx_clear_master(struct cdx_device cdx_dev)\ndrivers/cdx/cdx.c-240-{\ndrivers/cdx/cdx.c:241:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c:242:\tstruct cdx_device_config dev_config;\ndrivers/cdx/cdx.c-243-\tint ret = -EOPNOTSUPP;\n--\ndrivers/cdx/cdx.c-247-\tif (cdx-\u003eops-\u003edev_configure)\ndrivers/cdx/cdx.c:248:\t\tret = cdx-\u003eops-\u003edev_configure(cdx, cdx_dev-\u003ebus_num,\ndrivers/cdx/cdx.c:249:\t\t\t\t\t cdx_dev-\u003edev_num, \u0026dev_config);\ndrivers/cdx/cdx.c-250-\n--\ndrivers/cdx/cdx.c-252-}\ndrivers/cdx/cdx.c:253:EXPORT_SYMBOL_GPL(cdx_clear_master);\ndrivers/cdx/cdx.c-254-\ndrivers/cdx/cdx.c-255-/*\ndrivers/cdx/cdx.c:256: cdx_bus_match - device to driver matching callback\ndrivers/cdx/cdx.c-257- * @dev: the cdx device to match against\n--\ndrivers/cdx/cdx.c-262- /\ndrivers/cdx/cdx.c:263:static int cdx_bus_match(struct device dev, const struct device_driver drv)\ndrivers/cdx/cdx.c-264-{\ndrivers/cdx/cdx.c:265:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:266:\tconst struct cdx_driver cdx_drv = to_cdx_driver(drv);\ndrivers/cdx/cdx.c:267:\tconst struct cdx_device_id found_id = NULL;\ndrivers/cdx/cdx.c:268:\tconst struct cdx_device_id ids;\ndrivers/cdx/cdx.c-269-\tint ret;\ndrivers/cdx/cdx.c-270-\ndrivers/cdx/cdx.c:271:\tif (cdx_dev-\u003eis_bus)\ndrivers/cdx/cdx.c-272-\t\treturn false;\ndrivers/cdx/cdx.c-273-\ndrivers/cdx/cdx.c:274:\tids = cdx_drv-\u003ematch_id_table;\ndrivers/cdx/cdx.c-275-\n--\ndrivers/cdx/cdx.c-280-\ndrivers/cdx/cdx.c:281:\tfound_id = cdx_match_id(ids, cdx_dev);\ndrivers/cdx/cdx.c-282-\tif (!found_id)\n--\ndrivers/cdx/cdx.c-295-\t\tids = found_id + 1;\ndrivers/cdx/cdx.c:296:\t\tfound_id = cdx_match_id(ids, cdx_dev);\ndrivers/cdx/cdx.c-297-\t} while (found_id);\n--\ndrivers/cdx/cdx.c-301-\ndrivers/cdx/cdx.c:302:static int cdx_probe(struct device dev)\ndrivers/cdx/cdx.c-303-{\ndrivers/cdx/cdx.c:304:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c:305:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:306:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-307-\tint error;\n--\ndrivers/cdx/cdx.c-313-\tif (IS_ENABLED(CONFIG_GENERIC_MSI_IRQ) \u0026\u0026 cdx-\u003emsi_domain) {\ndrivers/cdx/cdx.c:314:\t\terror = msi_setup_device_data(\u0026cdx_dev-\u003edev);\ndrivers/cdx/cdx.c-315-\t\tif (error)\n--\ndrivers/cdx/cdx.c-318-\ndrivers/cdx/cdx.c:319:\terror = cdx_drv-\u003eprobe(cdx_dev);\ndrivers/cdx/cdx.c-320-\tif (error) {\n--\ndrivers/cdx/cdx.c-327-\ndrivers/cdx/cdx.c:328:static void cdx_remove(struct device dev)\ndrivers/cdx/cdx.c-329-{\ndrivers/cdx/cdx.c:330:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c:331:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-332-\ndrivers/cdx/cdx.c:333:\tif (cdx_drv \u0026\u0026 cdx_drv-\u003eremove)\ndrivers/cdx/cdx.c:334:\t\tcdx_drv-\u003eremove(cdx_dev);\ndrivers/cdx/cdx.c-335-}\ndrivers/cdx/cdx.c-336-\ndrivers/cdx/cdx.c:337:static void cdx_shutdown(struct device dev)\ndrivers/cdx/cdx.c-338-{\ndrivers/cdx/cdx.c:339:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c:340:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:341:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-342-\ndrivers/cdx/cdx.c:343:\tif (cdx_dev-\u003eis_bus \u0026\u0026 cdx_dev-\u003eenabled \u0026\u0026 cdx-\u003eops-\u003ebus_disable)\ndrivers/cdx/cdx.c:344:\t\tcdx-\u003eops-\u003ebus_disable(cdx, cdx_dev-\u003ebus_num);\ndrivers/cdx/cdx.c:345:\tif (cdx_drv \u0026\u0026 cdx_drv-\u003eshutdown)\ndrivers/cdx/cdx.c:346:\t\tcdx_drv-\u003eshutdown(cdx_dev);\ndrivers/cdx/cdx.c-347-}\ndrivers/cdx/cdx.c-348-\ndrivers/cdx/cdx.c:349:static int cdx_dma_configure(struct device dev)\ndrivers/cdx/cdx.c-350-{\ndrivers/cdx/cdx.c:351:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c:352:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:353:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c:354:\tu32 input_id = cdx_dev-\u003ereq_id;\ndrivers/cdx/cdx.c-355-\tint ret;\n--\ndrivers/cdx/cdx.c-362-\ndrivers/cdx/cdx.c:363:\t/* @cdx_drv may not be valid when we're called from the IOMMU layer /\ndrivers/cdx/cdx.c:364:\tif (!ret \u0026\u0026 dev-\u003edriver \u0026\u0026 !cdx_drv-\u003edriver_managed_dma) {\ndrivers/cdx/cdx.c-365-\t\tret = iommu_device_use_default_domain(dev);\n--\ndrivers/cdx/cdx.c-372-\ndrivers/cdx/cdx.c:373:static void cdx_dma_cleanup(struct device dev)\ndrivers/cdx/cdx.c-374-{\ndrivers/cdx/cdx.c:375:\tstruct cdx_driver cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-376-\ndrivers/cdx/cdx.c:377:\tif (!cdx_drv-\u003edriver_managed_dma)\ndrivers/cdx/cdx.c-378-\t\tiommu_device_unuse_default_domain(dev);\n--\ndrivers/cdx/cdx.c-381-/ show configuration fields /\ndrivers/cdx/cdx.c:382:#define cdx_config_attr(field, format_string)\t\\\ndrivers/cdx/cdx.c-383-static ssize_t\t\\\ndrivers/cdx/cdx.c=384=field##_show(struct device dev, struct device_attribute attr, char buf)\t\\\ndrivers/cdx/cdx.c-385-{\t\\\ndrivers/cdx/cdx.c:386:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\t\\\ndrivers/cdx/cdx.c:387:\treturn sysfs_emit(buf, format_string, cdx_dev-\u003efield);\t\\\ndrivers/cdx/cdx.c-388-}\t\\\ndrivers/cdx/cdx.c=389=static DEVICE_ATTR_RO(field)\ndrivers/cdx/cdx.c-390-\ndrivers/cdx/cdx.c:391:cdx_config_attr(vendor, \"0x%04x\\n\");\ndrivers/cdx/cdx.c:392:cdx_config_attr(device, \"0x%04x\\n\");\ndrivers/cdx/cdx.c:393:cdx_config_attr(subsystem_vendor, \"0x%04x\\n\");\ndrivers/cdx/cdx.c:394:cdx_config_attr(subsystem_device, \"0x%04x\\n\");\ndrivers/cdx/cdx.c:395:cdx_config_attr(revision, \"0x%02x\\n\");\ndrivers/cdx/cdx.c:396:cdx_config_attr(class, \"0x%06x\\n\");\ndrivers/cdx/cdx.c-397-\ndrivers/cdx/cdx.c=398=static ssize_t remove_store(struct device dev,\n--\ndrivers/cdx/cdx.c-412-\ndrivers/cdx/cdx.c:413:\t\tret = cdx_unregister_device(dev, NULL);\ndrivers/cdx/cdx.c-414-\t\tif (ret)\n--\ndrivers/cdx/cdx.c=422=static ssize_t reset_store(struct device dev, struct device_attribute attr,\n--\ndrivers/cdx/cdx.c-424-{\ndrivers/cdx/cdx.c:425:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-426-\tbool val;\n--\ndrivers/cdx/cdx.c-434-\ndrivers/cdx/cdx.c:435:\tif (cdx_dev-\u003eis_bus)\ndrivers/cdx/cdx.c-436-\t\t/ Reset all the devices attached to cdx bus /\ndrivers/cdx/cdx.c:437:\t\tret = device_for_each_child(dev, NULL, reset_cdx_device);\ndrivers/cdx/cdx.c-438-\telse\ndrivers/cdx/cdx.c:439:\t\tret = cdx_dev_reset(dev);\ndrivers/cdx/cdx.c-440-\n--\ndrivers/cdx/cdx.c=445=static ssize_t modalias_show(struct device dev, struct device_attribute attr,\n--\ndrivers/cdx/cdx.c-447-{\ndrivers/cdx/cdx.c:448:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-449-\ndrivers/cdx/cdx.c:450:\treturn sprintf(buf, \"cdx:v%04Xd%04Xsv%04Xsd%04Xc%06X\\n\", cdx_dev-\u003evendor,\ndrivers/cdx/cdx.c:451:\t\t\tcdx_dev-\u003edevice, cdx_dev-\u003esubsystem_vendor, cdx_dev-\u003esubsystem_device,\ndrivers/cdx/cdx.c:452:\t\t\tcdx_dev-\u003eclass);\ndrivers/cdx/cdx.c-453-}\n--\ndrivers/cdx/cdx.c=456=static ssize_t enable_store(struct device dev, struct device_attribute attr,\n--\ndrivers/cdx/cdx.c-458-{\ndrivers/cdx/cdx.c:459:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:460:\tstruct cdx_controller cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-461-\tbool enable;\n--\ndrivers/cdx/cdx.c-466-\ndrivers/cdx/cdx.c:467:\tif (enable == cdx_dev-\u003eenabled)\ndrivers/cdx/cdx.c-468-\t\treturn count;\n--\ndrivers/cdx/cdx.c-470-\tif (enable \u0026\u0026 cdx-\u003eops-\u003ebus_enable)\ndrivers/cdx/cdx.c:471:\t\tret = cdx-\u003eops-\u003ebus_enable(cdx, cdx_dev-\u003ebus_num);\ndrivers/cdx/cdx.c-472-\telse if (!enable \u0026\u0026 cdx-\u003eops-\u003ebus_disable)\ndrivers/cdx/cdx.c:473:\t\tret = cdx-\u003eops-\u003ebus_disable(cdx, cdx_dev-\u003ebus_num);\ndrivers/cdx/cdx.c-474-\telse\n--\ndrivers/cdx/cdx.c-477-\tif (!ret)\ndrivers/cdx/cdx.c:478:\t\tcdx_dev-\u003eenabled = enable;\ndrivers/cdx/cdx.c-479-\n--\ndrivers/cdx/cdx.c=483=static ssize_t enable_show(struct device dev, struct device_attribute attr, char buf)\ndrivers/cdx/cdx.c-484-{\ndrivers/cdx/cdx.c:485:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-486-\ndrivers/cdx/cdx.c:487:\treturn sysfs_emit(buf, \"%u\\n\", cdx_dev-\u003eenabled);\ndrivers/cdx/cdx.c-488-}\ndrivers/cdx/cdx.c=489=static DEVICE_ATTR_RW(enable);\ndrivers/cdx/cdx.c-490-\ndrivers/cdx/cdx.c:491:static umode_t cdx_dev_attrs_are_visible(struct kobject kobj, struct attribute a, int n)\ndrivers/cdx/cdx.c-492-{\ndrivers/cdx/cdx.c-493-\tstruct device dev = kobj_to_dev(kobj);\ndrivers/cdx/cdx.c:494:\tstruct cdx_device cdx_dev;\ndrivers/cdx/cdx.c-495-\ndrivers/cdx/cdx.c:496:\tcdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:497:\tif (!cdx_dev-\u003eis_bus)\ndrivers/cdx/cdx.c-498-\t\treturn a-\u003emode;\n--\ndrivers/cdx/cdx.c-502-\ndrivers/cdx/cdx.c:503:static umode_t cdx_bus_attrs_are_visible(struct kobject kobj, struct attribute a, int n)\ndrivers/cdx/cdx.c-504-{\ndrivers/cdx/cdx.c-505-\tstruct device dev = kobj_to_dev(kobj);\ndrivers/cdx/cdx.c:506:\tstruct cdx_device cdx_dev;\ndrivers/cdx/cdx.c-507-\ndrivers/cdx/cdx.c:508:\tcdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:509:\tif (cdx_dev-\u003eis_bus)\ndrivers/cdx/cdx.c-510-\t\treturn a-\u003emode;\n--\ndrivers/cdx/cdx.c-514-\ndrivers/cdx/cdx.c:515:static struct attribute cdx_dev_attrs[] = {\ndrivers/cdx/cdx.c-516-\t\u0026dev_attr_remove.attr,\n--\ndrivers/cdx/cdx.c-527-\ndrivers/cdx/cdx.c:528:static const struct attribute_group cdx_dev_group = {\ndrivers/cdx/cdx.c:529:\t.attrs = cdx_dev_attrs,\ndrivers/cdx/cdx.c:530:\t.is_visible = cdx_dev_attrs_are_visible,\ndrivers/cdx/cdx.c-531-};\ndrivers/cdx/cdx.c-532-\ndrivers/cdx/cdx.c:533:static struct attribute cdx_bus_dev_attrs[] = {\ndrivers/cdx/cdx.c-534-\t\u0026dev_attr_enable.attr,\n--\ndrivers/cdx/cdx.c-538-\ndrivers/cdx/cdx.c:539:static const struct attribute_group cdx_bus_dev_group = {\ndrivers/cdx/cdx.c:540:\t.attrs = cdx_bus_dev_attrs,\ndrivers/cdx/cdx.c:541:\t.is_visible = cdx_bus_attrs_are_visible,\ndrivers/cdx/cdx.c-542-};\ndrivers/cdx/cdx.c-543-\ndrivers/cdx/cdx.c:544:static const struct attribute_group cdx_dev_groups[] = {\ndrivers/cdx/cdx.c:545:\t\u0026cdx_dev_group,\ndrivers/cdx/cdx.c:546:\t\u0026cdx_bus_dev_group,\ndrivers/cdx/cdx.c-547-\tNULL,\n--\ndrivers/cdx/cdx.c-549-\ndrivers/cdx/cdx.c:550:static int cdx_debug_resource_show(struct seq_file s, void data)\ndrivers/cdx/cdx.c-551-{\ndrivers/cdx/cdx.c:552:\tstruct cdx_device cdx_dev = s-\u003eprivate;\ndrivers/cdx/cdx.c-553-\tint i;\n--\ndrivers/cdx/cdx.c-555-\tfor (i = 0; i \u003c MAX_CDX_DEV_RESOURCES; i++) {\ndrivers/cdx/cdx.c:556:\t\tstruct resource res = \u0026cdx_dev-\u003eres[i];\ndrivers/cdx/cdx.c-557-\n--\ndrivers/cdx/cdx.c-562-}\ndrivers/cdx/cdx.c:563:DEFINE_SHOW_ATTRIBUTE(cdx_debug_resource);\ndrivers/cdx/cdx.c-564-\ndrivers/cdx/cdx.c:565:static void cdx_device_debugfs_init(struct cdx_device cdx_dev)\ndrivers/cdx/cdx.c-566-{\ndrivers/cdx/cdx.c:567:\tcdx_dev-\u003edebugfs_dir = debugfs_create_dir(dev_name(\u0026cdx_dev-\u003edev), cdx_debugfs_dir);\ndrivers/cdx/cdx.c:568:\tif (IS_ERR(cdx_dev-\u003edebugfs_dir))\ndrivers/cdx/cdx.c-569-\t\treturn;\ndrivers/cdx/cdx.c-570-\ndrivers/cdx/cdx.c:571:\tdebugfs_create_file(\"resource\", 0444, cdx_dev-\u003edebugfs_dir, cdx_dev,\ndrivers/cdx/cdx.c:572:\t\t\t \u0026cdx_debug_resource_fops);\ndrivers/cdx/cdx.c-573-}\n--\ndrivers/cdx/cdx.c=575=static ssize_t rescan_store(const struct bus_type bus,\n--\ndrivers/cdx/cdx.c-577-{\ndrivers/cdx/cdx.c:578:\tstruct cdx_controller cdx;\ndrivers/cdx/cdx.c-579-\tstruct platform_device pd;\n--\ndrivers/cdx/cdx.c-587-\ndrivers/cdx/cdx.c:588:\tguard(mutex)(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-589-\ndrivers/cdx/cdx.c-590-\t/ Unregister all the devices on the bus /\ndrivers/cdx/cdx.c:591:\tcdx_unregister_devices(\u0026cdx_bus_type);\ndrivers/cdx/cdx.c-592-\n--\ndrivers/cdx/cdx.c=608=static BUS_ATTR_WO(rescan);\ndrivers/cdx/cdx.c-609-\ndrivers/cdx/cdx.c:610:static struct attribute cdx_bus_attrs[] = {\ndrivers/cdx/cdx.c-611-\t\u0026bus_attr_rescan.attr,\n--\ndrivers/cdx/cdx.c-613-};\ndrivers/cdx/cdx.c:614:ATTRIBUTE_GROUPS(cdx_bus);\ndrivers/cdx/cdx.c-615-\ndrivers/cdx/cdx.c:616:const struct bus_type cdx_bus_type = {\ndrivers/cdx/cdx.c-617-\t.name\t\t= \"cdx\",\ndrivers/cdx/cdx.c-618-\t.driver_override = true,\ndrivers/cdx/cdx.c:619:\t.match\t\t= cdx_bus_match,\ndrivers/cdx/cdx.c:620:\t.probe\t\t= cdx_probe,\ndrivers/cdx/cdx.c:621:\t.remove\t\t= cdx_remove,\ndrivers/cdx/cdx.c:622:\t.shutdown\t= cdx_shutdown,\ndrivers/cdx/cdx.c:623:\t.dma_configure\t= cdx_dma_configure,\ndrivers/cdx/cdx.c:624:\t.dma_cleanup\t= cdx_dma_cleanup,\ndrivers/cdx/cdx.c:625:\t.bus_groups\t= cdx_bus_groups,\ndrivers/cdx/cdx.c:626:\t.dev_groups\t= cdx_dev_groups,\ndrivers/cdx/cdx.c-627-};\ndrivers/cdx/cdx.c:628:EXPORT_SYMBOL_GPL(cdx_bus_type);\ndrivers/cdx/cdx.c-629-\ndrivers/cdx/cdx.c:630:int __cdx_driver_register(struct cdx_driver cdx_driver,\ndrivers/cdx/cdx.c-631-\t\t\t struct module owner)\n--\ndrivers/cdx/cdx.c-634-\ndrivers/cdx/cdx.c:635:\tcdx_driver-\u003edriver.owner = owner;\ndrivers/cdx/cdx.c:636:\tcdx_driver-\u003edriver.bus = \u0026cdx_bus_type;\ndrivers/cdx/cdx.c-637-\ndrivers/cdx/cdx.c:638:\terror = driver_register(\u0026cdx_driver-\u003edriver);\ndrivers/cdx/cdx.c-639-\tif (error) {\ndrivers/cdx/cdx.c-640-\t\tpr_err(\"driver_register() failed for %s: %d\\n\",\ndrivers/cdx/cdx.c:641:\t\t cdx_driver-\u003edriver.name, error);\ndrivers/cdx/cdx.c-642-\t\treturn error;\n--\ndrivers/cdx/cdx.c-646-}\ndrivers/cdx/cdx.c:647:EXPORT_SYMBOL_GPL(__cdx_driver_register);\ndrivers/cdx/cdx.c-648-\ndrivers/cdx/cdx.c:649:void cdx_driver_unregister(struct cdx_driver cdx_driver)\ndrivers/cdx/cdx.c-650-{\ndrivers/cdx/cdx.c:651:\tdriver_unregister(\u0026cdx_driver-\u003edriver);\ndrivers/cdx/cdx.c-652-}\ndrivers/cdx/cdx.c:653:EXPORT_SYMBOL_GPL(cdx_driver_unregister);\ndrivers/cdx/cdx.c-654-\ndrivers/cdx/cdx.c:655:static void cdx_device_release(struct device dev)\ndrivers/cdx/cdx.c-656-{\ndrivers/cdx/cdx.c:657:\tstruct cdx_device cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-658-\ndrivers/cdx/cdx.c:659:\tkfree(cdx_dev);\ndrivers/cdx/cdx.c-660-}\ndrivers/cdx/cdx.c-661-\ndrivers/cdx/cdx.c:662:static const struct vm_operations_struct cdx_phys_vm_ops = {\ndrivers/cdx/cdx.c-663-#ifdef CONFIG_HAVE_IOREMAP_PROT\n--\ndrivers/cdx/cdx.c-668-/\ndrivers/cdx/cdx.c:669: cdx_mmap_resource - map a CDX resource into user memory space\ndrivers/cdx/cdx.c-670- * @fp: File pointer. Not used in this function, but required where\n--\ndrivers/cdx/cdx.c-679- /\ndrivers/cdx/cdx.c:680:static int cdx_mmap_resource(struct file fp, struct kobject kobj,\ndrivers/cdx/cdx.c-681-\t\t\t const struct bin_attribute attr,\n--\ndrivers/cdx/cdx.c-683-{\ndrivers/cdx/cdx.c:684:\tstruct cdx_device cdx_dev = to_cdx_device(kobj_to_dev(kobj));\ndrivers/cdx/cdx.c-685-\tint num = (unsigned long)attr-\u003eprivate;\n--\ndrivers/cdx/cdx.c-688-\ndrivers/cdx/cdx.c:689:\tres = \u0026cdx_dev-\u003eres[num];\ndrivers/cdx/cdx.c-690-\tif (iomem_is_exclusive(res-\u003estart))\n--\ndrivers/cdx/cdx.c-693-\t/ Make sure the caller is mapping a valid resource for this device /\ndrivers/cdx/cdx.c:694:\tsize = ((cdx_resource_len(cdx_dev, num) - 1) \u003e\u003e PAGE_SHIFT) + 1;\ndrivers/cdx/cdx.c-695-\tif (vma-\u003evm_pgoff + vma_pages(vma) \u003e size)\n--\ndrivers/cdx/cdx.c-702-\tvma-\u003evm_page_prot = pgprot_device(vma-\u003evm_page_prot);\ndrivers/cdx/cdx.c:703:\tvma-\u003evm_pgoff += (cdx_resource_start(cdx_dev, num) \u003e\u003e PAGE_SHIFT);\ndrivers/cdx/cdx.c:704:\tvma-\u003evm_ops = \u0026cdx_phys_vm_ops;\ndrivers/cdx/cdx.c-705-\treturn io_remap_pfn_range(vma, vma-\u003evm_start, vma-\u003evm_pgoff,\n--\ndrivers/cdx/cdx.c-709-\ndrivers/cdx/cdx.c:710:static void cdx_destroy_res_attr(struct cdx_device cdx_dev, int num)\ndrivers/cdx/cdx.c-711-{\n--\ndrivers/cdx/cdx.c-717-\ndrivers/cdx/cdx.c:718:\t\tres_attr = cdx_dev-\u003eres_attr[i];\ndrivers/cdx/cdx.c-719-\t\tif (res_attr) {\ndrivers/cdx/cdx.c:720:\t\t\tsysfs_remove_bin_file(\u0026cdx_dev-\u003edev.kobj, res_attr);\ndrivers/cdx/cdx.c-721-\t\t\tkfree(res_attr);\n--\ndrivers/cdx/cdx.c-726-#define CDX_RES_ATTR_NAME_LEN\t10\ndrivers/cdx/cdx.c:727:static int cdx_create_res_attr(struct cdx_device cdx_dev, int num)\ndrivers/cdx/cdx.c-728-{\n--\ndrivers/cdx/cdx.c-740-\ndrivers/cdx/cdx.c:741:\tcdx_dev-\u003eres_attr[num] = res_attr;\ndrivers/cdx/cdx.c-742-\tsprintf(res_attr_name, \"resource%d\", num);\ndrivers/cdx/cdx.c-743-\ndrivers/cdx/cdx.c:744:\tres_attr-\u003emmap = cdx_mmap_resource;\ndrivers/cdx/cdx.c-745-\tres_attr-\u003eattr.name = res_attr_name;\ndrivers/cdx/cdx.c-746-\tres_attr-\u003eattr.mode = 0600;\ndrivers/cdx/cdx.c:747:\tres_attr-\u003esize = cdx_resource_len(cdx_dev, num);\ndrivers/cdx/cdx.c-748-\tres_attr-\u003eprivate = (void )(unsigned long)num;\ndrivers/cdx/cdx.c:749:\tret = sysfs_create_bin_file(\u0026cdx_dev-\u003edev.kobj, res_attr);\ndrivers/cdx/cdx.c-750-\tif (ret)\n--\n\n" }
31/2	2026/09/04 14:22	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 48281 output: 20 thoughts: 472 Thoughts: My Assessment of the CDX Controller Registration and Emulation Okay, let's break this down. My understanding is that the CDX controller registration begins within `drivers/cdx/controller/cdx_controller.c`. The `xlnx_cdx_probe` function is triggered by a platform device match for `"xlnx,versal-net-cdx"`. It then establishes a connection to a remoteproc instance (specifically, `r5_core_node`). This involves setting up an RPMSG driver. Once the RPMSG channel becomes operational, `cdx_rpmsg_probe` is invoked, which then schedules `cdx_rpmsg_post_probe_work`, ultimately leading to `cdx_rpmsg_post_probe` and, finally, `cdx_register_controller`. Communication with the firmware running on the Versal ACAP R5 core happens via MCDI (remoteproc mailbox/rpmsg) during either `rescan_store` or `cdx_scan_devices`, which are used to enumerate buses and devices. Now, a critical point: there's no software emulator for the CDX controller or any of its associated devices within QEMU, GCE, or even the mainline Linux kernel. This makes things difficult. Furthermore, the architecture in question here is `amd64`, while the `CDX_BUS` functionality appears to depend on a combination of `OF && ARM64 \|\| COMPILE_TEST`. This indicates that the Versal ACAP/CDX bus is specific to AMD/Xilinx ARM64 SoC FPGA hardware and needs physical hardware and firmware (MCDI communication with the R5 core) to operate. Considering the given instructions, specifically Section 2, where we're looking for scenarios where `WorthFuzzing=false`, two criteria immediately stand out. * Structurally unreachable hardware: CDX falls squarely into this category. It requires a Versal ACAP SoC, a specific hardware platform with vendor-specific PCIe interactions, which are not emulated in standard QEMU. * Unreachable execution paths: The code's dependence on the ARM64 architecture, coupled with its reliance on specific firmware and hardware, makes it impossible to reach these execution paths on amd64 systems. To be absolutely certain, I need to double-check if there's any way to instantiate the CDX controller on amd64 or within standard QEMU. Are there any platform devices or mock drivers that might simulate the CDX behavior? I need to search for `"versal-net-cdx"` or any other CDX-related keywords to make sure there's nothing that I'm missing. Given my current understanding, I am highly confident that this path is not worth fuzzing, based on the requirements I was given.
32/2	2026/09/04 14:22	tool	grepper	0m Args: { "Expression": "versal-net-cdx" } Results: { "Output": "Documentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-3----\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml:4:$id: http://devicetree.org/schemas/bus/xlnx,versal-net-cdx.yaml#\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-5-$schema: http://devicetree.org/meta-schemas/core.yaml#\n--\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml=37=properties:\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-38- compatible:\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml:39: const: xlnx,versal-net-cdx\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-40-\n--\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml=70=examples:\n--\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-72- cdx {\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml:73: compatible = \"xlnx,versal-net-cdx\";\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-74- #address-cells = \u003c1\u003e;\n--\nMAINTAINERS=1058=S:\tMaintained\nMAINTAINERS:1059:F:\tDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml\nMAINTAINERS-1060-F:\tdrivers/cdx/\n--\ndrivers/cdx/cdx.c=83=static struct dentry cdx_debugfs_dir;\ndrivers/cdx/cdx.c-84-\ndrivers/cdx/cdx.c:85:static char *compat_node_name = \"xlnx,versal-net-cdx\";\ndrivers/cdx/cdx.c-86-\n--\ndrivers/cdx/controller/cdx_controller.c=236=static const struct of_device_id cdx_match_table[] = {\ndrivers/cdx/controller/cdx_controller.c:237:\t{.compatible = \"xlnx,versal-net-cdx\",},\ndrivers/cdx/controller/cdx_controller.c-238-\t{ },\n" }
33/2	2026/09/04 14:22	llm	patch-evaluator	0m Model: gemini-3.7-flash Args: null Results: null Tokens: input: 50054 output: 148 thoughts: 403 Thoughts: Analysis of the Target Code and Fuzzing Feasibility Okay, after this thorough review, I'm absolutely certain. Everything points directly to an AMD/Xilinx Versal FPGA / ARM64 platform. This isn't just a generic ARM64 thing; it requires physical AMD/Xilinx Versal ACAP hardware with R5 firmware communication. Even though the target architecture is `amd64` initially, the requirement is still physical hardware. Specifically, that `vfio_cdx_mmap_mmio` function in `drivers/vfio/cdx/main.c` – it's only ever called through the `mmap` callback of the `vfio-cdx` driver. And that driver is only registered for CDX devices, which are enabled by `CONFIG_VFIO_CDX` and `CONFIG_CDX_BUS`. You can't just spin this up in QEMU or GCE. Without that physical CDX hardware, without the controller to discover and register CDX devices, this code is structurally unreachable within standard virtualized environments. Let's quickly verify our `set-results` fields. Yep, `WorthFuzzing` is unequivocally `false`. The `Reasoning` should be crystal clear. The `FocusSymbols`? Empty. No focus symbols. And the `EnableConfigs`? Also empty. Perfect. Let's double-check the tool call formatting. Okay, `FocusSymbols: []`, `EnableConfigs: []`, and the `Reasoning`: "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX driver (drivers/vfio/cdx/main.c), which supports AMD/Xilinx Versal CDX bus devices. CDX bus devices require physical AMD/Xilinx Versal ACAP hardware and ARM64 firmware communication (MCDI over rpmsg), which cannot be emulated or instantiated in standard virtualized environments (e.g. QEMU on amd64). Hence, the modified code is structurally unreachable for fuzzing." That's good. Alright, time to call `set-results`.
34/2	2026/09/04 14:23	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX bus driver (drivers/vfio/cdx/main.c). The CDX bus is specific to AMD/Xilinx Versal ACAP platforms and requires physical hardware/firmware (rpmsg/MCDI communication with an R5 management controller) to discover and register CDX devices. Because there are no emulated CDX controllers or devices in standard virtualized QEMU environments (particularly on amd64), the modified code is structurally unreachable.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX bus driver (drivers/vfio/cdx/main.c). The CDX bus is specific to AMD/Xilinx Versal ACAP platforms and requires physical hardware/firmware (rpmsg/MCDI communication with an R5 management controller) to discover and register CDX devices. Because there are no emulated CDX controllers or devices in standard virtualized QEMU environments (particularly on amd64), the modified code is structurally unreachable.", "WorthFuzzing": false }
35/1	2026/09/04 14:23	action	If	0m Args: { "WorthFuzzing": false } Results: null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX bus driver (drivers/vfio/cdx/main.c). The CDX bus is specific to AMD/Xilinx Versal ACAP platforms and requires physical hardware/firmware (rpmsg/MCDI communication with an R5 management controller) to discover and register CDX devices. Because there are no emulated CDX controllers or devices in standard virtualized QEMU environments (particularly on amd64), the modified code is structurally unreachable.",
  "WorthFuzzing": false
}

{
  "PatchDiff": "commit 0c71f6fb2c6a6a05e62c7dd4dbba4b85caef1e61\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Fri Sep 4 14:21:20 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/vfio/cdx/main.c b/drivers/vfio/cdx/main.c\nindex b31ed4be7bdc1..53d916cfcb8e8 100644\n--- a/drivers/vfio/cdx/main.c\n+++ b/drivers/vfio/cdx/main.c\n@@ -254,10 +254,10 @@ static int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,\n \tif (base + size \u003e region.size)\n \t\treturn -EINVAL;\n \n-\tvma-\u003evm_pgoff = (region.addr \u003e\u003e PAGE_SHIFT) + pgoff;\n \tvma-\u003evm_page_prot = pgprot_device(vma-\u003evm_page_prot);\n \n-\treturn io_remap_pfn_range(vma, vma-\u003evm_start, vma-\u003evm_pgoff,\n+\treturn io_remap_pfn_range(vma, vma-\u003evm_start,\n+\t\t\t\t  (region.addr \u003e\u003e PAGE_SHIFT) + pgoff,\n \t\t\t\t  size, vma-\u003evm_page_prot);\n }\n \n"
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX bus driver (drivers/vfio/cdx/main.c). The CDX bus is specific to AMD/Xilinx Versal ACAP platforms and requires physical hardware/firmware (rpmsg/MCDI communication with an R5 management controller) to discover and register CDX devices. Because there are no emulated CDX controllers or devices in standard virtualized QEMU environments (particularly on amd64), the modified code is structurally unreachable.",
  "WorthFuzzing": false
}

You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.

================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.

- REACHABILITY IS THE PRIMARY GATE:
  Fuzzing can only discover bugs in code that can actually execute in standard virtualized
  environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
  If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
  regardless of whether it adds assertions or complex logic.

- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
  Patch authors routinely label changes as "cleanups", "refactorings", or state
  "No functional change intended". Do NOT take these claims at face value.
  Code refactorings that rearrange logic, introduce helper functions, or alter state management
  in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
  If reachable executable code is modified or refactored, it MUST be fuzzed.

- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
  When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
  BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
  Even if the author believes the invariant always holds, fuzzing is essential to verify whether
  an unusual sequence of operations can violate it.

================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:

- Non-kernel and non-executable changes:
  * Modifications to Documentation/, comments, or spelling fixes.
  * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
    that do not affect the compiled kernel image (vmlinux) or kernel modules.
  * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
    that do not alter control flow or data structures.
  * Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
  * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
    ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
  * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
    physical PCI hot-unplug or manual sysfs driver unbinding.
  * Code paths exclusive to architectures other than the target architecture.

================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
  * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
    BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
  * Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
  * Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
  * Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).

================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:

- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
  Do NOT list generic, ubiquitous functions called by almost every program in the corpus
  (including, but not limited to: general memory allocators and deallocators, page fault
  and trap handlers, or core synchronization primitives; this is not an exhaustive list).
  Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
  which severely dilutes fuzzing effort away from the actual changes.

- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
  List functions that specifically implement the logic being added or altered, or direct API entrypoints
  for the subsystem feature under review.

- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
  Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
  distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
  If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
  functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).

================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit 0c71f6fb2c6a6a05e62c7dd4dbba4b85caef1e61
Author: syz-cluster <triage@syzkaller.com>
Date:   Fri Sep 4 14:21:20 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/vfio/cdx/main.c b/drivers/vfio/cdx/main.c
index b31ed4be7bdc1..53d916cfcb8e8 100644
--- a/drivers/vfio/cdx/main.c
+++ b/drivers/vfio/cdx/main.c
@@ -254,10 +254,10 @@ static int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,
 	if (base + size > region.size)
 		return -EINVAL;
 
-	vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
 	vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
 
-	return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+	return io_remap_pfn_range(vma, vma->vm_start,
+				  (region.addr >> PAGE_SHIFT) + pgoff,
 				  size, vma->vm_page_prot);
 }

							input: 2962
							output: 19
							thoughts: 281

**Evaluating a Potential Syzkaller Patch for VFIO/CDX**

Okay, so I've got a patch here that's touching `drivers/vfio/cdx/main.c`, and the goal is to evaluate its suitability for syzkaller fuzzing. My immediate thought is, "What *is* CDX, and is it even fuzzable?" I need to understand if this is something that's reachable in a typical system or if it's tied to specific hardware. That's the critical first step.

My plan is to dive into the codebase using my standard tools, probably `git grep` and some file reading, to quickly get a lay of the land. I need to figure out what the CDX driver actually *does* and how it's initialized and used. I'll need to figure out if it is an important bus and part of the main kernel.

Now, looking at the actual patch: it's within `vfio_cdx_mmap_mmio`. It looks like it's a small change to how a memory region is mapped, specifically around calculating the page offset and `io_remap_pfn_range`. I'll need to understand how the original code works and how the modification changes the behaviour. My first priority is to understand the context of this change, so I'll probably need to understand what this bus is.

{
  "Expression": "VFIO_CDX"
}

{
  "Output": "drivers/vfio/Makefile=17=obj-$(CONFIG_VFIO_FSL_MC) += fsl-mc/\ndrivers/vfio/Makefile:18:obj-$(CONFIG_VFIO_CDX) += cdx/\n--\ndrivers/vfio/cdx/Kconfig-7-\ndrivers/vfio/cdx/Kconfig:8:config VFIO_CDX\ndrivers/vfio/cdx/Kconfig-9-\ttristate \"VFIO support for CDX bus devices\"\n--\ndrivers/vfio/cdx/Makefile-5-\ndrivers/vfio/cdx/Makefile:6:obj-$(CONFIG_VFIO_CDX) += vfio-cdx.o\ndrivers/vfio/cdx/Makefile-7-\n--\ndrivers/vfio/cdx/main.c=244=static int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,\n--\ndrivers/vfio/cdx/main.c-250-\tpgoff = vma-\u003evm_pgoff \u0026\ndrivers/vfio/cdx/main.c:251:\t\t((1U \u003c\u003c (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT)) - 1);\ndrivers/vfio/cdx/main.c-252-\tbase = pgoff \u003c\u003c PAGE_SHIFT;\n--\ndrivers/vfio/cdx/main.c=264=static int vfio_cdx_mmap(struct vfio_device *core_vdev,\n--\ndrivers/vfio/cdx/main.c-271-\ndrivers/vfio/cdx/main.c:272:\tindex = vma-\u003evm_pgoff \u003e\u003e (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT);\ndrivers/vfio/cdx/main.c-273-\n--\ndrivers/vfio/cdx/private.h-5-\ndrivers/vfio/cdx/private.h:6:#ifndef VFIO_CDX_PRIVATE_H\ndrivers/vfio/cdx/private.h:7:#define VFIO_CDX_PRIVATE_H\ndrivers/vfio/cdx/private.h-8-\n--\ndrivers/vfio/cdx/private.h-10-\ndrivers/vfio/cdx/private.h:11:#define VFIO_CDX_OFFSET_SHIFT    40\ndrivers/vfio/cdx/private.h-12-\ndrivers/vfio/cdx/private.h=13=static inline u64 vfio_cdx_index_to_offset(u32 index)\ndrivers/vfio/cdx/private.h-14-{\ndrivers/vfio/cdx/private.h:15:\treturn ((u64)(index) \u003c\u003c VFIO_CDX_OFFSET_SHIFT);\ndrivers/vfio/cdx/private.h-16-}\n--\ndrivers/vfio/cdx/private.h=59=static void vfio_cdx_irqs_cleanup(struct vfio_cdx_device *vdev)\n--\ndrivers/vfio/cdx/private.h-63-\ndrivers/vfio/cdx/private.h:64:#endif /* VFIO_CDX_PRIVATE_H */\n"
}

							input: 4354
							output: 36
							thoughts: 34

Okay, here's my interpretation of that thought process, assuming I'm already pretty familiar with kernel development and hardware:

**Investigating the CDX Bus Configuration**

Alright, before I dive into this further, I need to get a clear picture of what this "CDX" bus actually *is*. The names suggest a connection, but I can't assume. My first stop should be the Kconfig files related to it – `drivers/vfio/cdx/Kconfig` and `drivers/cdx/Kconfig`. These configuration files are the source of truth for the kernel's configuration options. They'll tell me if it’s a VFIO-specific bus, a more general CDX bus, and what its dependencies and intended uses are. That's the best way to grasp its purpose and behavior within the kernel ecosystem. Knowing the configuration options will set me up to look for more information.

{
  "File": "drivers/vfio/cdx/Kconfig",
  "FirstLine": 1,
  "LineCount": 20
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0\n   2:\t#\n   3:\t# VFIO CDX configuration\n   4:\t#\n   5:\t# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.\n   6:\t#\n   7:\t\n   8:\tconfig VFIO_CDX\n   9:\t\ttristate \"VFIO support for CDX bus devices\"\n  10:\t\tdepends on CDX_BUS\n  11:\t\tselect EVENTFD\n  12:\t\thelp\n  13:\t\t  Driver to enable VFIO support for the devices on CDX bus.\n  14:\t\t  This is required to make use of CDX devices present in\n  15:\t\t  the system using the VFIO framework.\n  16:\t\n  17:\t\t  If you don't know what to do here, say N.\n"
}

							input: 4846
							output: 18
							thoughts: 13

Here's my take on the thought process, as if it were my own:

**Diving into the Kconfig of the CDX Drivers**

Okay, so I need to get started on this... Let's take a look at the `drivers/cdx/Kconfig` file. I'm going to want to understand the configuration options for the CDX drivers. It's the standard place to start, right? I'll probably be able to glean information about the modules, any dependencies, and default settings from there. This is where the core logic of which drivers are built is laid out. I need to get a handle on the available features and how they are controlled. Time to dig in!

{
  "Expression": "CDX_BUS"
}

{
  "Output": "drivers/Makefile=194=obj-$(CONFIG_DRM_ACCEL)\t\t+= accel/\ndrivers/Makefile:195:obj-$(CONFIG_CDX_BUS)\t\t+= cdx/\ndrivers/Makefile-196-obj-$(CONFIG_DPLL)\t\t+= dpll/\n--\ndrivers/cdx/Kconfig-7-\ndrivers/cdx/Kconfig:8:config CDX_BUS\ndrivers/cdx/Kconfig-9-\tbool \"CDX Bus driver\"\n--\ndrivers/cdx/Makefile-7-\ndrivers/cdx/Makefile:8:ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE='\"CDX_BUS\"'\ndrivers/cdx/Makefile-9-\ndrivers/cdx/Makefile:10:obj-$(CONFIG_CDX_BUS) += cdx.o controller/\ndrivers/cdx/Makefile-11-\ndrivers/cdx/Makefile=12=ifdef CONFIG_GENERIC_MSI_IRQ\ndrivers/cdx/Makefile:13:obj-$(CONFIG_CDX_BUS) += cdx_msi.o\ndrivers/cdx/Makefile-14-endif\n--\ndrivers/cdx/cdx.c=756=int cdx_device_add(struct cdx_dev_params *dev_params)\n--\ndrivers/cdx/cdx.c-795-\tdev_set_name(\u0026cdx_dev-\u003edev, \"cdx-%02x:%02x\",\ndrivers/cdx/cdx.c:796:\t\t     ((cdx-\u003eid \u003c\u003c CDX_CONTROLLER_ID_SHIFT) | (cdx_dev-\u003ebus_num \u0026 CDX_BUS_NUM_MASK)),\ndrivers/cdx/cdx.c-797-\t\t     cdx_dev-\u003edev_num);\n--\ndrivers/cdx/cdx.c-841-}\ndrivers/cdx/cdx.c:842:EXPORT_SYMBOL_NS_GPL(cdx_device_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-843-\ndrivers/cdx/cdx.c=844=struct device *cdx_bus_add(struct cdx_controller *cdx, u8 bus_num)\n--\ndrivers/cdx/cdx.c-862-\tdev_set_name(\u0026cdx_dev-\u003edev, \"cdx-%02x\",\ndrivers/cdx/cdx.c:863:\t\t     ((cdx-\u003eid \u003c\u003c CDX_CONTROLLER_ID_SHIFT) | (bus_num \u0026 CDX_BUS_NUM_MASK)));\ndrivers/cdx/cdx.c-864-\n--\ndrivers/cdx/cdx.c-888-}\ndrivers/cdx/cdx.c:889:EXPORT_SYMBOL_NS_GPL(cdx_bus_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-890-\ndrivers/cdx/cdx.c=891=int cdx_register_controller(struct cdx_controller *cdx)\n--\ndrivers/cdx/cdx.c-913-}\ndrivers/cdx/cdx.c:914:EXPORT_SYMBOL_NS_GPL(cdx_register_controller, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-915-\ndrivers/cdx/cdx.c=916=void cdx_unregister_controller(struct cdx_controller *cdx)\n--\ndrivers/cdx/cdx.c-928-}\ndrivers/cdx/cdx.c:929:EXPORT_SYMBOL_NS_GPL(cdx_unregister_controller, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-930-\n--\ndrivers/cdx/cdx_msi.c=160=struct irq_domain *cdx_msi_domain_init(struct device *dev)\n--\ndrivers/cdx/cdx_msi.c-192-}\ndrivers/cdx/cdx_msi.c:193:EXPORT_SYMBOL_NS_GPL(cdx_msi_domain_init, \"CDX_BUS_CONTROLLER\");\n--\ndrivers/cdx/controller/Kconfig-7-\ndrivers/cdx/controller/Kconfig:8:if CDX_BUS\ndrivers/cdx/controller/Kconfig-9-\n--\ndrivers/cdx/controller/cdx_controller.c=256=MODULE_LICENSE(\"GPL\");\ndrivers/cdx/controller/cdx_controller.c:257:MODULE_IMPORT_NS(\"CDX_BUS_CONTROLLER\");\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-247-/*\ndrivers/cdx/controller/mc_cdx_pcol.h:248: * MC_CMD_CDX_BUS_ENUM_BUSES\ndrivers/cdx/controller/mc_cdx_pcol.h-249- * CDX bus hosts devices (functions) that are implemented using the Composable\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-256- */\ndrivers/cdx/controller/mc_cdx_pcol.h:257:#define MC_CMD_CDX_BUS_ENUM_BUSES\t\t\t\t0x1\ndrivers/cdx/controller/mc_cdx_pcol.h:258:#define MC_CMD_CDX_BUS_ENUM_BUSES_MSGSET\t\t\t0x1\ndrivers/cdx/controller/mc_cdx_pcol.h-259-#undef MC_CMD_0x1_PRIVILEGE_CTG\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-262-\ndrivers/cdx/controller/mc_cdx_pcol.h:263:/* MC_CMD_CDX_BUS_ENUM_BUSES_IN msgrequest */\ndrivers/cdx/controller/mc_cdx_pcol.h:264:#define MC_CMD_CDX_BUS_ENUM_BUSES_IN_LEN\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h-265-\ndrivers/cdx/controller/mc_cdx_pcol.h:266:/* MC_CMD_CDX_BUS_ENUM_BUSES_OUT msgresponse */\ndrivers/cdx/controller/mc_cdx_pcol.h:267:#define MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-268-/*\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-271- */\ndrivers/cdx/controller/mc_cdx_pcol.h:272:#define MC_CMD_CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT_OFST\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:273:#define MC_CMD_CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-274-\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-276-/*\ndrivers/cdx/controller/mc_cdx_pcol.h:277: * MC_CMD_CDX_BUS_ENUM_DEVICES\ndrivers/cdx/controller/mc_cdx_pcol.h-278- * Enumerate CDX bus devices on a given bus\ndrivers/cdx/controller/mc_cdx_pcol.h-279- */\ndrivers/cdx/controller/mc_cdx_pcol.h:280:#define MC_CMD_CDX_BUS_ENUM_DEVICES\t\t\t\t0x2\ndrivers/cdx/controller/mc_cdx_pcol.h:281:#define MC_CMD_CDX_BUS_ENUM_DEVICES_MSGSET\t\t\t0x2\ndrivers/cdx/controller/mc_cdx_pcol.h-282-#undef MC_CMD_0x2_PRIVILEGE_CTG\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-285-\ndrivers/cdx/controller/mc_cdx_pcol.h:286:/* MC_CMD_CDX_BUS_ENUM_DEVICES_IN msgrequest */\ndrivers/cdx/controller/mc_cdx_pcol.h:287:#define MC_CMD_CDX_BUS_ENUM_DEVICES_IN_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-288-/*\ndrivers/cdx/controller/mc_cdx_pcol.h-289- * Bus number to enumerate, in range 0 to BUS_COUNT-1, as returned by\ndrivers/cdx/controller/mc_cdx_pcol.h:290: * MC_CMD_CDX_BUS_ENUM_BUSES_OUT\ndrivers/cdx/controller/mc_cdx_pcol.h-291- */\ndrivers/cdx/controller/mc_cdx_pcol.h:292:#define MC_CMD_CDX_BUS_ENUM_DEVICES_IN_BUS_OFST\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:293:#define MC_CMD_CDX_BUS_ENUM_DEVICES_IN_BUS_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-294-\ndrivers/cdx/controller/mc_cdx_pcol.h:295:/* MC_CMD_CDX_BUS_ENUM_DEVICES_OUT msgresponse */\ndrivers/cdx/controller/mc_cdx_pcol.h:296:#define MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-297-/*\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-301- */\ndrivers/cdx/controller/mc_cdx_pcol.h:302:#define MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT_OFST\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:303:#define MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT_LEN\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-304-\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-306-/*\ndrivers/cdx/controller/mc_cdx_pcol.h:307: * MC_CMD_CDX_BUS_GET_DEVICE_CONFIG\ndrivers/cdx/controller/mc_cdx_pcol.h-308- * Returns device identification and MMIO/MSI resource data for a CDX device.\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-318- */\ndrivers/cdx/controller/mc_cdx_pcol.h:319:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG\t\t\t\t\t0x3\ndrivers/cdx/controller/mc_cdx_pcol.h:320:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_MSGSET\t\t\t\t\t0x3\ndrivers/cdx/controller/mc_cdx_pcol.h-321-#undef MC_CMD_0x3_PRIVILEGE_CTG\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-324-\ndrivers/cdx/controller/mc_cdx_pcol.h:325:/* MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN msgrequest */\ndrivers/cdx/controller/mc_cdx_pcol.h:326:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_LEN\t\t\t\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h-327-/* Device bus number, in range 0 to BUS_COUNT-1 */\ndrivers/cdx/controller/mc_cdx_pcol.h:328:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_BUS_OFST\t\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:329:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_BUS_LEN\t\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-330-/* Device number relative to the bus, in range 0 to DEVICE_COUNT-1 for that bus */\ndrivers/cdx/controller/mc_cdx_pcol.h:331:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE_OFST\t\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:332:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE_LEN\t\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-333-\ndrivers/cdx/controller/mc_cdx_pcol.h:334:/* MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT msgresponse */\ndrivers/cdx/controller/mc_cdx_pcol.h:335:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_LEN\t\t\t\t88\ndrivers/cdx/controller/mc_cdx_pcol.h-336-/* 16-bit Vendor identifier, compliant with PCI-SIG VendorID assignment. */\ndrivers/cdx/controller/mc_cdx_pcol.h:337:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_VENDOR_ID_OFST\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:338:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_VENDOR_ID_LEN\t\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h-339-/* 16-bit Device ID assigned by the vendor */\ndrivers/cdx/controller/mc_cdx_pcol.h:340:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_ID_OFST\t\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h:341:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_ID_LEN\t\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h-342-/*\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-345- */\ndrivers/cdx/controller/mc_cdx_pcol.h:346:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_VENDOR_ID_OFST\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:347:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_VENDOR_ID_LEN\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h-348-/*\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-351- */\ndrivers/cdx/controller/mc_cdx_pcol.h:352:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_DEVICE_ID_OFST\t\t6\ndrivers/cdx/controller/mc_cdx_pcol.h:353:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_DEVICE_ID_LEN\t\t2\ndrivers/cdx/controller/mc_cdx_pcol.h-354-/* 24-bit Device Class code, compliant with PCI-SIG Device Class codes */\ndrivers/cdx/controller/mc_cdx_pcol.h:355:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_CLASS_OFST\t\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:356:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_CLASS_LEN\t\t\t3\ndrivers/cdx/controller/mc_cdx_pcol.h-357-/* 8-bit vendor-assigned revision */\ndrivers/cdx/controller/mc_cdx_pcol.h:358:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_REVISION_OFST\t\t11\ndrivers/cdx/controller/mc_cdx_pcol.h:359:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_REVISION_LEN\t\t1\ndrivers/cdx/controller/mc_cdx_pcol.h-360-/* Reserved (alignment) */\ndrivers/cdx/controller/mc_cdx_pcol.h:361:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_RESERVED_OFST\t\t\t12\ndrivers/cdx/controller/mc_cdx_pcol.h:362:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_RESERVED_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-363-/* MMIO region 0 base address (bus address), 0 if unused */\ndrivers/cdx/controller/mc_cdx_pcol.h:364:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_OFST\t\t16\ndrivers/cdx/controller/mc_cdx_pcol.h:365:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:366:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_OFST\t\t16\ndrivers/cdx/controller/mc_cdx_pcol.h:367:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:368:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_LBN\t\t128\ndrivers/cdx/controller/mc_cdx_pcol.h:369:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:370:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_OFST\t\t20\ndrivers/cdx/controller/mc_cdx_pcol.h:371:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:372:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_LBN\t\t160\ndrivers/cdx/controller/mc_cdx_pcol.h:373:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-374-/* MMIO region 0 size, 0 if unused */\ndrivers/cdx/controller/mc_cdx_pcol.h:375:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_OFST\t\t24\ndrivers/cdx/controller/mc_cdx_pcol.h:376:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:377:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_OFST\t\t24\ndrivers/cdx/controller/mc_cdx_pcol.h:378:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:379:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_LBN\t\t192\ndrivers/cdx/controller/mc_cdx_pcol.h:380:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:381:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_OFST\t\t28\ndrivers/cdx/controller/mc_cdx_pcol.h:382:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:383:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_LBN\t\t224\ndrivers/cdx/controller/mc_cdx_pcol.h:384:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-385-/* MMIO region 1 base address (bus address), 0 if unused */\ndrivers/cdx/controller/mc_cdx_pcol.h:386:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_OFST\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:387:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:388:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_OFST\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:389:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:390:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_LBN\t\t256\ndrivers/cdx/controller/mc_cdx_pcol.h:391:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:392:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_OFST\t\t36\ndrivers/cdx/controller/mc_cdx_pcol.h:393:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:394:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_LBN\t\t288\ndrivers/cdx/controller/mc_cdx_pcol.h:395:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-396-/* MMIO region 1 size, 0 if unused */\ndrivers/cdx/controller/mc_cdx_pcol.h:397:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_OFST\t\t40\ndrivers/cdx/controller/mc_cdx_pcol.h:398:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:399:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_OFST\t\t40\ndrivers/cdx/controller/mc_cdx_pcol.h:400:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:401:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_LBN\t\t320\ndrivers/cdx/controller/mc_cdx_pcol.h:402:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:403:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_OFST\t\t44\ndrivers/cdx/controller/mc_cdx_pcol.h:404:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:405:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_LBN\t\t352\ndrivers/cdx/controller/mc_cdx_pcol.h:406:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-407-/* MMIO region 2 base address (bus address), 0 if unused */\ndrivers/cdx/controller/mc_cdx_pcol.h:408:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_OFST\t\t48\ndrivers/cdx/controller/mc_cdx_pcol.h:409:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:410:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_OFST\t\t48\ndrivers/cdx/controller/mc_cdx_pcol.h:411:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:412:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_LBN\t\t384\ndrivers/cdx/controller/mc_cdx_pcol.h:413:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:414:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_OFST\t\t52\ndrivers/cdx/controller/mc_cdx_pcol.h:415:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:416:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_LBN\t\t416\ndrivers/cdx/controller/mc_cdx_pcol.h:417:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-418-/* MMIO region 2 size, 0 if unused */\ndrivers/cdx/controller/mc_cdx_pcol.h:419:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_OFST\t\t56\ndrivers/cdx/controller/mc_cdx_pcol.h:420:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:421:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_OFST\t\t56\ndrivers/cdx/controller/mc_cdx_pcol.h:422:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:423:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_LBN\t\t448\ndrivers/cdx/controller/mc_cdx_pcol.h:424:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:425:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_OFST\t\t60\ndrivers/cdx/controller/mc_cdx_pcol.h:426:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:427:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_LBN\t\t480\ndrivers/cdx/controller/mc_cdx_pcol.h:428:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-429-/* MMIO region 3 base address (bus address), 0 if unused */\ndrivers/cdx/controller/mc_cdx_pcol.h:430:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_OFST\t\t64\ndrivers/cdx/controller/mc_cdx_pcol.h:431:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:432:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_OFST\t\t64\ndrivers/cdx/controller/mc_cdx_pcol.h:433:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:434:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_LBN\t\t512\ndrivers/cdx/controller/mc_cdx_pcol.h:435:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:436:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_OFST\t\t68\ndrivers/cdx/controller/mc_cdx_pcol.h:437:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:438:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_LBN\t\t544\ndrivers/cdx/controller/mc_cdx_pcol.h:439:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-440-/* MMIO region 3 size, 0 if unused */\ndrivers/cdx/controller/mc_cdx_pcol.h:441:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_OFST\t\t72\ndrivers/cdx/controller/mc_cdx_pcol.h:442:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LEN\t\t8\ndrivers/cdx/controller/mc_cdx_pcol.h:443:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_OFST\t\t72\ndrivers/cdx/controller/mc_cdx_pcol.h:444:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:445:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_LBN\t\t576\ndrivers/cdx/controller/mc_cdx_pcol.h:446:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_LO_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h:447:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_OFST\t\t76\ndrivers/cdx/controller/mc_cdx_pcol.h:448:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h:449:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_LBN\t\t608\ndrivers/cdx/controller/mc_cdx_pcol.h:450:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE_HI_WIDTH\t\t32\ndrivers/cdx/controller/mc_cdx_pcol.h-451-/* MSI vector count */\ndrivers/cdx/controller/mc_cdx_pcol.h:452:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MSI_COUNT_OFST\t\t\t80\ndrivers/cdx/controller/mc_cdx_pcol.h:453:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_MSI_COUNT_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-454-/* Requester ID used by device (SMMU StreamID, GIC ITS DeviceID) */\ndrivers/cdx/controller/mc_cdx_pcol.h:455:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID_OFST\t\t\t84\ndrivers/cdx/controller/mc_cdx_pcol.h:456:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-457-\ndrivers/cdx/controller/mc_cdx_pcol.h:458:/* MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2 msgresponse */\ndrivers/cdx/controller/mc_cdx_pcol.h:459:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_LEN\t\t\t\t92\ndrivers/cdx/controller/mc_cdx_pcol.h-460-/* Requester ID used by device for GIC ITS DeviceID */\ndrivers/cdx/controller/mc_cdx_pcol.h:461:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_REQUESTER_DEVICE_ID_OFST\t88\ndrivers/cdx/controller/mc_cdx_pcol.h:462:#define MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_REQUESTER_DEVICE_ID_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-463-\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-465-/*\ndrivers/cdx/controller/mc_cdx_pcol.h:466: * MC_CMD_CDX_BUS_DOWN\ndrivers/cdx/controller/mc_cdx_pcol.h-467- * Asserting reset on the CDX bus causes all devices on the bus to be quiesced.\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-477- */\ndrivers/cdx/controller/mc_cdx_pcol.h:478:#define MC_CMD_CDX_BUS_DOWN\t\t\t\t\t0x4\ndrivers/cdx/controller/mc_cdx_pcol.h:479:#define MC_CMD_CDX_BUS_DOWN_MSGSET\t\t\t0x4\ndrivers/cdx/controller/mc_cdx_pcol.h-480-\ndrivers/cdx/controller/mc_cdx_pcol.h:481:/* MC_CMD_CDX_BUS_DOWN_IN msgrequest */\ndrivers/cdx/controller/mc_cdx_pcol.h:482:#define MC_CMD_CDX_BUS_DOWN_IN_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-483-/* Bus number to put in reset, in range 0 to BUS_COUNT-1 */\ndrivers/cdx/controller/mc_cdx_pcol.h:484:#define MC_CMD_CDX_BUS_DOWN_IN_BUS_OFST\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:485:#define MC_CMD_CDX_BUS_DOWN_IN_BUS_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-486-\ndrivers/cdx/controller/mc_cdx_pcol.h-487-/*\ndrivers/cdx/controller/mc_cdx_pcol.h:488: * MC_CMD_CDX_BUS_DOWN_OUT msgresponse: The bus is quiesced, no further\ndrivers/cdx/controller/mc_cdx_pcol.h-489- * upstream traffic for devices on this bus.\ndrivers/cdx/controller/mc_cdx_pcol.h-490- */\ndrivers/cdx/controller/mc_cdx_pcol.h:491:#define MC_CMD_CDX_BUS_DOWN_OUT_LEN\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h-492-\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-494-/*\ndrivers/cdx/controller/mc_cdx_pcol.h:495: * MC_CMD_CDX_BUS_UP\ndrivers/cdx/controller/mc_cdx_pcol.h-496- * After bus reset is de-asserted, devices are in a state which is functionally\n--\ndrivers/cdx/controller/mc_cdx_pcol.h-505- */\ndrivers/cdx/controller/mc_cdx_pcol.h:506:#define MC_CMD_CDX_BUS_UP\t\t\t\t\t0x5\ndrivers/cdx/controller/mc_cdx_pcol.h:507:#define MC_CMD_CDX_BUS_UP_MSGSET\t\t\t0x5\ndrivers/cdx/controller/mc_cdx_pcol.h-508-\ndrivers/cdx/controller/mc_cdx_pcol.h:509:/* MC_CMD_CDX_BUS_UP_IN msgrequest */\ndrivers/cdx/controller/mc_cdx_pcol.h:510:#define MC_CMD_CDX_BUS_UP_IN_LEN\t\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-511-/* Bus number to take out of reset, in range 0 to BUS_COUNT-1 */\ndrivers/cdx/controller/mc_cdx_pcol.h:512:#define MC_CMD_CDX_BUS_UP_IN_BUS_OFST\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h:513:#define MC_CMD_CDX_BUS_UP_IN_BUS_LEN\t\t4\ndrivers/cdx/controller/mc_cdx_pcol.h-514-\ndrivers/cdx/controller/mc_cdx_pcol.h:515:/* MC_CMD_CDX_BUS_UP_OUT msgresponse: The bus can now be enumerated. */\ndrivers/cdx/controller/mc_cdx_pcol.h:516:#define MC_CMD_CDX_BUS_UP_OUT_LEN\t\t\t0\ndrivers/cdx/controller/mc_cdx_pcol.h-517-\n--\ndrivers/cdx/controller/mcdi_functions.c=10=int cdx_mcdi_get_num_buses(struct cdx_mcdi *cdx)\ndrivers/cdx/controller/mcdi_functions.c-11-{\ndrivers/cdx/controller/mcdi_functions.c:12:\tMCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN);\ndrivers/cdx/controller/mcdi_functions.c-13-\tsize_t outlen;\n--\ndrivers/cdx/controller/mcdi_functions.c-15-\ndrivers/cdx/controller/mcdi_functions.c:16:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_ENUM_BUSES, NULL, 0,\ndrivers/cdx/controller/mcdi_functions.c-17-\t\t\t   outbuf, sizeof(outbuf), \u0026outlen);\n--\ndrivers/cdx/controller/mcdi_functions.c-20-\ndrivers/cdx/controller/mcdi_functions.c:21:\tif (outlen != MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN)\ndrivers/cdx/controller/mcdi_functions.c-22-\t\treturn -EIO;\ndrivers/cdx/controller/mcdi_functions.c-23-\ndrivers/cdx/controller/mcdi_functions.c:24:\treturn MCDI_DWORD(outbuf, CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT);\ndrivers/cdx/controller/mcdi_functions.c-25-}\n--\ndrivers/cdx/controller/mcdi_functions.c=27=int cdx_mcdi_get_num_devs(struct cdx_mcdi *cdx, int bus_num)\ndrivers/cdx/controller/mcdi_functions.c-28-{\ndrivers/cdx/controller/mcdi_functions.c:29:\tMCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN);\ndrivers/cdx/controller/mcdi_functions.c:30:\tMCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_ENUM_DEVICES_IN_LEN);\ndrivers/cdx/controller/mcdi_functions.c-31-\tsize_t outlen;\n--\ndrivers/cdx/controller/mcdi_functions.c-33-\ndrivers/cdx/controller/mcdi_functions.c:34:\tMCDI_SET_DWORD(inbuf, CDX_BUS_ENUM_DEVICES_IN_BUS, bus_num);\ndrivers/cdx/controller/mcdi_functions.c-35-\ndrivers/cdx/controller/mcdi_functions.c:36:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_ENUM_DEVICES, inbuf, sizeof(inbuf),\ndrivers/cdx/controller/mcdi_functions.c-37-\t\t\t   outbuf, sizeof(outbuf), \u0026outlen);\n--\ndrivers/cdx/controller/mcdi_functions.c-40-\ndrivers/cdx/controller/mcdi_functions.c:41:\tif (outlen != MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN)\ndrivers/cdx/controller/mcdi_functions.c-42-\t\treturn -EIO;\ndrivers/cdx/controller/mcdi_functions.c-43-\ndrivers/cdx/controller/mcdi_functions.c:44:\treturn MCDI_DWORD(outbuf, CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT);\ndrivers/cdx/controller/mcdi_functions.c-45-}\n--\ndrivers/cdx/controller/mcdi_functions.c=47=int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx,\n--\ndrivers/cdx/controller/mcdi_functions.c-50-{\ndrivers/cdx/controller/mcdi_functions.c:51:\tMCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_LEN);\ndrivers/cdx/controller/mcdi_functions.c:52:\tMCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_LEN);\ndrivers/cdx/controller/mcdi_functions.c-53-\tstruct resource *res = \u0026dev_params-\u003eres[0];\n--\ndrivers/cdx/controller/mcdi_functions.c-57-\ndrivers/cdx/controller/mcdi_functions.c:58:\tMCDI_SET_DWORD(inbuf, CDX_BUS_GET_DEVICE_CONFIG_IN_BUS, bus_num);\ndrivers/cdx/controller/mcdi_functions.c:59:\tMCDI_SET_DWORD(inbuf, CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE, dev_num);\ndrivers/cdx/controller/mcdi_functions.c-60-\ndrivers/cdx/controller/mcdi_functions.c:61:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG, inbuf, sizeof(inbuf),\ndrivers/cdx/controller/mcdi_functions.c-62-\t\t\t   outbuf, sizeof(outbuf), \u0026outlen);\n--\ndrivers/cdx/controller/mcdi_functions.c-65-\ndrivers/cdx/controller/mcdi_functions.c:66:\tif (outlen != MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_LEN)\ndrivers/cdx/controller/mcdi_functions.c-67-\t\treturn -EIO;\n--\ndrivers/cdx/controller/mcdi_functions.c-71-\ndrivers/cdx/controller/mcdi_functions.c:72:\treq_id = MCDI_DWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID);\ndrivers/cdx/controller/mcdi_functions.c-73-\tdev_params-\u003ereq_id = req_id;\n--\ndrivers/cdx/controller/mcdi_functions.c-75-\tdev_params-\u003emsi_dev_id = MCDI_DWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:76:\t\t\t\t\t    CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_REQUESTER_DEVICE_ID);\ndrivers/cdx/controller/mcdi_functions.c-77-\ndrivers/cdx/controller/mcdi_functions.c-78-\tdev_params-\u003eres_count = 0;\ndrivers/cdx/controller/mcdi_functions.c:79:\tif (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE) != 0) {\ndrivers/cdx/controller/mcdi_functions.c-80-\t\tres[dev_params-\u003eres_count].start =\ndrivers/cdx/controller/mcdi_functions.c:81:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE);\ndrivers/cdx/controller/mcdi_functions.c-82-\t\tres[dev_params-\u003eres_count].end =\ndrivers/cdx/controller/mcdi_functions.c:83:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE) +\ndrivers/cdx/controller/mcdi_functions.c-84-\t\t\t\t   MCDI_QWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:85:\t\t\t\t\t      CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE) - 1;\ndrivers/cdx/controller/mcdi_functions.c-86-\t\tres[dev_params-\u003eres_count].flags = IORESOURCE_MEM;\n--\ndrivers/cdx/controller/mcdi_functions.c-89-\ndrivers/cdx/controller/mcdi_functions.c:90:\tif (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE) != 0) {\ndrivers/cdx/controller/mcdi_functions.c-91-\t\tres[dev_params-\u003eres_count].start =\ndrivers/cdx/controller/mcdi_functions.c:92:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE);\ndrivers/cdx/controller/mcdi_functions.c-93-\t\tres[dev_params-\u003eres_count].end =\ndrivers/cdx/controller/mcdi_functions.c:94:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE) +\ndrivers/cdx/controller/mcdi_functions.c-95-\t\t\t\t   MCDI_QWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:96:\t\t\t\t\t      CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE) - 1;\ndrivers/cdx/controller/mcdi_functions.c-97-\t\tres[dev_params-\u003eres_count].flags = IORESOURCE_MEM;\n--\ndrivers/cdx/controller/mcdi_functions.c-100-\ndrivers/cdx/controller/mcdi_functions.c:101:\tif (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE) != 0) {\ndrivers/cdx/controller/mcdi_functions.c-102-\t\tres[dev_params-\u003eres_count].start =\ndrivers/cdx/controller/mcdi_functions.c:103:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE);\ndrivers/cdx/controller/mcdi_functions.c-104-\t\tres[dev_params-\u003eres_count].end =\ndrivers/cdx/controller/mcdi_functions.c:105:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE) +\ndrivers/cdx/controller/mcdi_functions.c-106-\t\t\t\t   MCDI_QWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:107:\t\t\t\t\t      CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE) - 1;\ndrivers/cdx/controller/mcdi_functions.c-108-\t\tres[dev_params-\u003eres_count].flags = IORESOURCE_MEM;\n--\ndrivers/cdx/controller/mcdi_functions.c-111-\ndrivers/cdx/controller/mcdi_functions.c:112:\tif (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE) != 0) {\ndrivers/cdx/controller/mcdi_functions.c-113-\t\tres[dev_params-\u003eres_count].start =\ndrivers/cdx/controller/mcdi_functions.c:114:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE);\ndrivers/cdx/controller/mcdi_functions.c-115-\t\tres[dev_params-\u003eres_count].end =\ndrivers/cdx/controller/mcdi_functions.c:116:\t\t\tMCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE) +\ndrivers/cdx/controller/mcdi_functions.c-117-\t\t\t\t   MCDI_QWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:118:\t\t\t\t\t      CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE) - 1;\ndrivers/cdx/controller/mcdi_functions.c-119-\t\tres[dev_params-\u003eres_count].flags = IORESOURCE_MEM;\n--\ndrivers/cdx/controller/mcdi_functions.c-122-\ndrivers/cdx/controller/mcdi_functions.c:123:\tdev_params-\u003evendor = MCDI_WORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_VENDOR_ID);\ndrivers/cdx/controller/mcdi_functions.c:124:\tdev_params-\u003edevice = MCDI_WORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_ID);\ndrivers/cdx/controller/mcdi_functions.c-125-\tdev_params-\u003esubsys_vendor = MCDI_WORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:126:\t\t\t\t\t      CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_VENDOR_ID);\ndrivers/cdx/controller/mcdi_functions.c-127-\tdev_params-\u003esubsys_device = MCDI_WORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:128:\t\t\t\t\t      CDX_BUS_GET_DEVICE_CONFIG_OUT_SUBSYS_DEVICE_ID);\ndrivers/cdx/controller/mcdi_functions.c-129-\tdev_params-\u003eclass = MCDI_DWORD(outbuf,\ndrivers/cdx/controller/mcdi_functions.c:130:\t\t\t\t       CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_CLASS) \u0026 0xFFFFFF;\ndrivers/cdx/controller/mcdi_functions.c:131:\tdev_params-\u003erevision = MCDI_BYTE(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_REVISION);\ndrivers/cdx/controller/mcdi_functions.c:132:\tdev_params-\u003enum_msi = MCDI_DWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MSI_COUNT);\ndrivers/cdx/controller/mcdi_functions.c-133-\n--\ndrivers/cdx/controller/mcdi_functions.c=137=int cdx_mcdi_bus_enable(struct cdx_mcdi *cdx, u8 bus_num)\ndrivers/cdx/controller/mcdi_functions.c-138-{\ndrivers/cdx/controller/mcdi_functions.c:139:\tMCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_UP_IN_LEN);\ndrivers/cdx/controller/mcdi_functions.c-140-\tint ret;\ndrivers/cdx/controller/mcdi_functions.c-141-\ndrivers/cdx/controller/mcdi_functions.c:142:\tMCDI_SET_DWORD(inbuf, CDX_BUS_UP_IN_BUS, bus_num);\ndrivers/cdx/controller/mcdi_functions.c:143:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_UP, inbuf, sizeof(inbuf),\ndrivers/cdx/controller/mcdi_functions.c-144-\t\t\t   NULL, 0, NULL);\n--\ndrivers/cdx/controller/mcdi_functions.c=149=int cdx_mcdi_bus_disable(struct cdx_mcdi *cdx, u8 bus_num)\ndrivers/cdx/controller/mcdi_functions.c-150-{\ndrivers/cdx/controller/mcdi_functions.c:151:\tMCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_DOWN_IN_LEN);\ndrivers/cdx/controller/mcdi_functions.c-152-\tint ret;\ndrivers/cdx/controller/mcdi_functions.c-153-\ndrivers/cdx/controller/mcdi_functions.c:154:\tMCDI_SET_DWORD(inbuf, CDX_BUS_DOWN_IN_BUS, bus_num);\ndrivers/cdx/controller/mcdi_functions.c:155:\tret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_DOWN, inbuf, sizeof(inbuf),\ndrivers/cdx/controller/mcdi_functions.c-156-\t\t\t   NULL, 0, NULL);\n--\ndrivers/gpu/drm/radeon/r600.c=1615=u32 r600_gpu_check_soft_reset(struct radeon_device *rdev)\n--\ndrivers/gpu/drm/radeon/r600.c-1667-\tif (G_000E50_MCB_BUSY(tmp) | G_000E50_MCDZ_BUSY(tmp) |\ndrivers/gpu/drm/radeon/r600.c:1668:\t    G_000E50_MCDY_BUSY(tmp) | G_000E50_MCDX_BUSY(tmp) |\ndrivers/gpu/drm/radeon/r600.c-1669-\t    G_000E50_MCDW_BUSY(tmp))\n--\ndrivers/gpu/drm/radeon/r600d.h-1833-#define\t\tG_000E50_MCDY_BUSY(x)\t\t\t(((x) \u003e\u003e 11) \u0026 1)\ndrivers/gpu/drm/radeon/r600d.h:1834:#define\t\tG_000E50_MCDX_BUSY(x)\t\t\t(((x) \u003e\u003e 12) \u0026 1)\ndrivers/gpu/drm/radeon/r600d.h-1835-#define\t\tG_000E50_MCDW_BUSY(x)\t\t\t(((x) \u003e\u003e 13) \u0026 1)\n--\ndrivers/iommu/iommu.c=186=static const struct bus_type * const iommu_buses[] = {\n--\ndrivers/iommu/iommu.c-199-#endif\ndrivers/iommu/iommu.c:200:#ifdef CONFIG_CDX_BUS\ndrivers/iommu/iommu.c-201-\t\u0026cdx_bus_type,\n--\ndrivers/vfio/cdx/Kconfig=8=config VFIO_CDX\ndrivers/vfio/cdx/Kconfig-9-\ttristate \"VFIO support for CDX bus devices\"\ndrivers/vfio/cdx/Kconfig:10:\tdepends on CDX_BUS\ndrivers/vfio/cdx/Kconfig-11-\tselect EVENTFD\n--\ndrivers/vfio/cdx/main.c=361=MODULE_DESCRIPTION(\"VFIO for CDX devices - User Level meta-driver\");\ndrivers/vfio/cdx/main.c:362:MODULE_IMPORT_NS(\"CDX_BUS\");\n--\ninclude/linux/cdx/cdx_bus.h-8-\ninclude/linux/cdx/cdx_bus.h:9:#ifndef _CDX_BUS_H_\ninclude/linux/cdx/cdx_bus.h:10:#define _CDX_BUS_H_\ninclude/linux/cdx/cdx_bus.h-11-\n--\ninclude/linux/cdx/cdx_bus.h-18-#define CDX_CONTROLLER_ID_SHIFT 4\ninclude/linux/cdx/cdx_bus.h:19:#define CDX_BUS_NUM_MASK 0xF\ninclude/linux/cdx/cdx_bus.h-20-\n--\ninclude/linux/cdx/cdx_bus.h=281=static inline void cdx_disable_msi(struct cdx_device *cdx_dev)\n--\ninclude/linux/cdx/cdx_bus.h-286-\ninclude/linux/cdx/cdx_bus.h:287:#endif /* _CDX_BUS_H_ */\n"
}

							input: 20803
							output: 20
							thoughts: 26

Here's my take on the thought process:

**Investigating CDX Controller Registration**

Okay, so I need to figure out which drivers are registering themselves as `cdx_controller` instances. The most direct approach is to leverage my old friend, `grep`. I'll run a search specifically looking for the function name `cdx_register_controller`. This should give me a quick list of all the places in the codebase where this registration is happening. From there, I can start to understand which specific drivers are managing these controllers and what their respective roles are. This gives me a starting point for further investigation if needed.

{
  "Expression": "cdx_register_controller"
}

{
  "Output": "drivers/cdx/cdx.c=889=EXPORT_SYMBOL_NS_GPL(cdx_bus_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-890-\ndrivers/cdx/cdx.c:891:int cdx_register_controller(struct cdx_controller *cdx)\ndrivers/cdx/cdx.c-892-{\n--\ndrivers/cdx/cdx.c-913-}\ndrivers/cdx/cdx.c:914:EXPORT_SYMBOL_NS_GPL(cdx_register_controller, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-915-\n--\ndrivers/cdx/cdx.h=31=struct cdx_dev_params {\n--\ndrivers/cdx/cdx.h-49-/**\ndrivers/cdx/cdx.h:50: * cdx_register_controller - Register a CDX controller and its ports\ndrivers/cdx/cdx.h-51- *\t\ton the CDX bus.\n--\ndrivers/cdx/cdx.h-55- */\ndrivers/cdx/cdx.h:56:int cdx_register_controller(struct cdx_controller *cdx);\ndrivers/cdx/cdx.h-57-\n--\ndrivers/cdx/controller/cdx_controller.c=46=void cdx_rpmsg_post_probe(struct cdx_controller *cdx)\n--\ndrivers/cdx/controller/cdx_controller.c-48-\t/* Register CDX controller with CDX bus driver */\ndrivers/cdx/controller/cdx_controller.c:49:\tif (cdx_register_controller(cdx))\ndrivers/cdx/controller/cdx_controller.c-50-\t\tdev_err(cdx-\u003edev, \"Failed to register CDX controller\\n\");\n"
}

							input: 21462
							output: 28
							thoughts: 40

Okay, let's dive into this. I need to understand what's happening within the `drivers/cdx/controller/cdx_controller.c` file. My initial thought is to figure out what functionality that file is responsible for and, more specifically, what the `cdx` controller is doing. A good first step would be to get a handle on the register initialization and usage. I'll need to locate where this file is registered within the larger system. Time to fire up `grep` within the `drivers/cdx/controller/` directory and see what pops up, searching for mentions of the `cdx_controller.c` file. Hopefully, this will lead me to the relevant initialization routines or module registration points and give me a clear picture of its integration.

{
  "Expression": "cdx_controller",
  "PathPrefix": "drivers/cdx"
}

{
  "Output": "drivers/cdx/cdx.c-78-/* IDA for CDX controllers registered with the CDX bus */\ndrivers/cdx/cdx.c:79:static DEFINE_IDA(cdx_controller_ida);\ndrivers/cdx/cdx.c-80-/* Lock to protect controller ops */\ndrivers/cdx/cdx.c:81:static DEFINE_MUTEX(cdx_controller_lock);\ndrivers/cdx/cdx.c-82-/* Debugfs dir for cdx bus */\n--\ndrivers/cdx/cdx.c=95=int cdx_dev_reset(struct device *dev)\n--\ndrivers/cdx/cdx.c-97-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:98:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-99-\tstruct cdx_device_config dev_config = {0};\n--\ndrivers/cdx/cdx.c=146=static int cdx_unregister_device(struct device *dev,\n--\ndrivers/cdx/cdx.c-149-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:150:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-151-\n--\ndrivers/cdx/cdx.c=223=int cdx_set_master(struct cdx_device *cdx_dev)\ndrivers/cdx/cdx.c-224-{\ndrivers/cdx/cdx.c:225:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-226-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/cdx.c=239=int cdx_clear_master(struct cdx_device *cdx_dev)\ndrivers/cdx/cdx.c-240-{\ndrivers/cdx/cdx.c:241:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-242-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/cdx.c=302=static int cdx_probe(struct device *dev)\n--\ndrivers/cdx/cdx.c-305-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:306:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-307-\tint error;\n--\ndrivers/cdx/cdx.c=337=static void cdx_shutdown(struct device *dev)\n--\ndrivers/cdx/cdx.c-340-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:341:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-342-\n--\ndrivers/cdx/cdx.c=349=static int cdx_dma_configure(struct device *dev)\n--\ndrivers/cdx/cdx.c-352-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:353:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-354-\tu32 input_id = cdx_dev-\u003ereq_id;\n--\ndrivers/cdx/cdx.c=456=static ssize_t enable_store(struct device *dev, struct device_attribute *attr,\n--\ndrivers/cdx/cdx.c-459-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:460:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-461-\tbool enable;\n--\ndrivers/cdx/cdx.c=575=static ssize_t rescan_store(const struct bus_type *bus,\n--\ndrivers/cdx/cdx.c-577-{\ndrivers/cdx/cdx.c:578:\tstruct cdx_controller *cdx;\ndrivers/cdx/cdx.c-579-\tstruct platform_device *pd;\n--\ndrivers/cdx/cdx.c-587-\ndrivers/cdx/cdx.c:588:\tguard(mutex)(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-589-\n--\ndrivers/cdx/cdx.c=756=int cdx_device_add(struct cdx_dev_params *dev_params)\ndrivers/cdx/cdx.c-757-{\ndrivers/cdx/cdx.c:758:\tstruct cdx_controller *cdx = dev_params-\u003ecdx;\ndrivers/cdx/cdx.c-759-\tstruct cdx_device *cdx_dev;\n--\ndrivers/cdx/cdx.c=842=EXPORT_SYMBOL_NS_GPL(cdx_device_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-843-\ndrivers/cdx/cdx.c:844:struct device *cdx_bus_add(struct cdx_controller *cdx, u8 bus_num)\ndrivers/cdx/cdx.c-845-{\n--\ndrivers/cdx/cdx.c=889=EXPORT_SYMBOL_NS_GPL(cdx_bus_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-890-\ndrivers/cdx/cdx.c:891:int cdx_register_controller(struct cdx_controller *cdx)\ndrivers/cdx/cdx.c-892-{\n--\ndrivers/cdx/cdx.c-894-\ndrivers/cdx/cdx.c:895:\tret = ida_alloc_range(\u0026cdx_controller_ida, 0,  MAX_CDX_CONTROLLERS - 1, GFP_KERNEL);\ndrivers/cdx/cdx.c-896-\tif (ret \u003c 0) {\n--\ndrivers/cdx/cdx.c-902-\ndrivers/cdx/cdx.c:903:\tmutex_lock(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-904-\tcdx-\u003eid = ret;\n--\ndrivers/cdx/cdx.c-909-\tcdx-\u003econtroller_registered = true;\ndrivers/cdx/cdx.c:910:\tmutex_unlock(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-911-\n--\ndrivers/cdx/cdx.c=914=EXPORT_SYMBOL_NS_GPL(cdx_register_controller, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-915-\ndrivers/cdx/cdx.c:916:void cdx_unregister_controller(struct cdx_controller *cdx)\ndrivers/cdx/cdx.c-917-{\n--\ndrivers/cdx/cdx.c-920-\ndrivers/cdx/cdx.c:921:\tmutex_lock(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-922-\n--\ndrivers/cdx/cdx.c-924-\tdevice_for_each_child(cdx-\u003edev, NULL, cdx_unregister_device);\ndrivers/cdx/cdx.c:925:\tida_free(\u0026cdx_controller_ida, cdx-\u003eid);\ndrivers/cdx/cdx.c-926-\ndrivers/cdx/cdx.c:927:\tmutex_unlock(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-928-}\n--\ndrivers/cdx/cdx.h=31=struct cdx_dev_params {\ndrivers/cdx/cdx.h:32:\tstruct cdx_controller *cdx;\ndrivers/cdx/cdx.h-33-\tstruct device *parent;\n--\ndrivers/cdx/cdx.h-55- */\ndrivers/cdx/cdx.h:56:int cdx_register_controller(struct cdx_controller *cdx);\ndrivers/cdx/cdx.h-57-\n--\ndrivers/cdx/cdx.h-61- */\ndrivers/cdx/cdx.h:62:void cdx_unregister_controller(struct cdx_controller *cdx);\ndrivers/cdx/cdx.h-63-\n--\ndrivers/cdx/cdx.h=73=int cdx_device_add(struct cdx_dev_params *dev_params);\n--\ndrivers/cdx/cdx.h-83- */\ndrivers/cdx/cdx.h:84:struct device *cdx_bus_add(struct cdx_controller *cdx, u8 bus_num);\ndrivers/cdx/cdx.h-85-\n--\ndrivers/cdx/cdx_msi.c=39=static void cdx_msi_write_irq_unlock(struct irq_data *irq_data)\n--\ndrivers/cdx/cdx_msi.c-42-\tstruct cdx_device *cdx_dev = to_cdx_device(msi_desc-\u003edev);\ndrivers/cdx/cdx_msi.c:43:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx_msi.c-44-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/cdx_msi.c=68=int cdx_enable_msi(struct cdx_device *cdx_dev)\ndrivers/cdx/cdx_msi.c-69-{\ndrivers/cdx/cdx_msi.c:70:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx_msi.c-71-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/cdx_msi.c=84=void cdx_disable_msi(struct cdx_device *cdx_dev)\ndrivers/cdx/cdx_msi.c-85-{\ndrivers/cdx/cdx_msi.c:86:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx_msi.c-87-\tstruct cdx_device_config dev_config;\n--\ndrivers/cdx/controller/Makefile=8=obj-$(CONFIG_CDX_CONTROLLER) += cdx-controller.o\ndrivers/cdx/controller/Makefile:9:cdx-controller-objs := cdx_controller.o cdx_rpmsg.o mcdi.o mcdi_functions.o\n--\ndrivers/cdx/controller/cdx_controller.c-12-\ndrivers/cdx/controller/cdx_controller.c:13:#include \"cdx_controller.h\"\ndrivers/cdx/controller/cdx_controller.c-14-#include \"../cdx.h\"\n--\ndrivers/cdx/controller/cdx_controller.c=31=static const struct cdx_mcdi_ops mcdi_ops = {\n--\ndrivers/cdx/controller/cdx_controller.c-35-\ndrivers/cdx/controller/cdx_controller.c:36:static int cdx_bus_enable(struct cdx_controller *cdx, u8 bus_num)\ndrivers/cdx/controller/cdx_controller.c-37-{\n--\ndrivers/cdx/controller/cdx_controller.c-40-\ndrivers/cdx/controller/cdx_controller.c:41:static int cdx_bus_disable(struct cdx_controller *cdx, u8 bus_num)\ndrivers/cdx/controller/cdx_controller.c-42-{\n--\ndrivers/cdx/controller/cdx_controller.c-45-\ndrivers/cdx/controller/cdx_controller.c:46:void cdx_rpmsg_post_probe(struct cdx_controller *cdx)\ndrivers/cdx/controller/cdx_controller.c-47-{\n--\ndrivers/cdx/controller/cdx_controller.c-52-\ndrivers/cdx/controller/cdx_controller.c:53:void cdx_rpmsg_pre_remove(struct cdx_controller *cdx)\ndrivers/cdx/controller/cdx_controller.c-54-{\n--\ndrivers/cdx/controller/cdx_controller.c-58-\ndrivers/cdx/controller/cdx_controller.c:59:static int cdx_configure_device(struct cdx_controller *cdx,\ndrivers/cdx/controller/cdx_controller.c-60-\t\t\t\tu8 bus_num, u8 dev_num,\n--\ndrivers/cdx/controller/cdx_controller.c-92-\ndrivers/cdx/controller/cdx_controller.c:93:static int cdx_scan_devices(struct cdx_controller *cdx)\ndrivers/cdx/controller/cdx_controller.c-94-{\n--\ndrivers/cdx/controller/cdx_controller.c=164=static int xlnx_cdx_probe(struct platform_device *pdev)\ndrivers/cdx/controller/cdx_controller.c-165-{\ndrivers/cdx/controller/cdx_controller.c:166:\tstruct cdx_controller *cdx;\ndrivers/cdx/controller/cdx_controller.c-167-\tstruct cdx_mcdi *cdx_mcdi;\n--\ndrivers/cdx/controller/cdx_controller.c=222=static void xlnx_cdx_remove(struct platform_device *pdev)\ndrivers/cdx/controller/cdx_controller.c-223-{\ndrivers/cdx/controller/cdx_controller.c:224:\tstruct cdx_controller *cdx = platform_get_drvdata(pdev);\ndrivers/cdx/controller/cdx_controller.c-225-\tstruct cdx_mcdi *cdx_mcdi = cdx-\u003epriv;\n--\ndrivers/cdx/controller/cdx_controller.h-13-\ndrivers/cdx/controller/cdx_controller.h:14:void cdx_rpmsg_post_probe(struct cdx_controller *cdx);\ndrivers/cdx/controller/cdx_controller.h-15-\ndrivers/cdx/controller/cdx_controller.h:16:void cdx_rpmsg_pre_remove(struct cdx_controller *cdx);\ndrivers/cdx/controller/cdx_controller.h-17-\n--\ndrivers/cdx/controller/cdx_rpmsg.c-15-#include \"../cdx.h\"\ndrivers/cdx/controller/cdx_rpmsg.c:16:#include \"cdx_controller.h\"\ndrivers/cdx/controller/cdx_rpmsg.c-17-#include \"mcdi_functions.h\"\n--\ndrivers/cdx/controller/cdx_rpmsg.c=46=static int cdx_attach_to_rproc(struct platform_device *pdev)\n--\ndrivers/cdx/controller/cdx_rpmsg.c-48-\tstruct device_node *r5_core_node;\ndrivers/cdx/controller/cdx_rpmsg.c:49:\tstruct cdx_controller *cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-50-\tstruct cdx_mcdi *cdx_mcdi;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=85=static void cdx_detach_to_r5(struct platform_device *pdev)\ndrivers/cdx/controller/cdx_rpmsg.c-86-{\ndrivers/cdx/controller/cdx_rpmsg.c:87:\tstruct cdx_controller *cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-88-\tstruct cdx_mcdi *cdx_mcdi;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=97=static int cdx_rpmsg_cb(struct rpmsg_device *rpdev, void *data,\n--\ndrivers/cdx/controller/cdx_rpmsg.c-99-{\ndrivers/cdx/controller/cdx_rpmsg.c:100:\tstruct cdx_controller *cdx_c = dev_get_drvdata(\u0026rpdev-\u003edev);\ndrivers/cdx/controller/cdx_rpmsg.c-101-\tstruct cdx_mcdi *cdx_mcdi = cdx_c-\u003epriv;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=111=static void cdx_rpmsg_post_probe_work(struct work_struct *work)\ndrivers/cdx/controller/cdx_rpmsg.c-112-{\ndrivers/cdx/controller/cdx_rpmsg.c:113:\tstruct cdx_controller *cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-114-\tstruct cdx_mcdi *cdx_mcdi;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=121=static int cdx_rpmsg_probe(struct rpmsg_device *rpdev)\n--\ndrivers/cdx/controller/cdx_rpmsg.c-123-\tstruct rpmsg_channel_info chinfo = {0};\ndrivers/cdx/controller/cdx_rpmsg.c:124:\tstruct cdx_controller *cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-125-\tstruct cdx_mcdi *cdx_mcdi;\ndrivers/cdx/controller/cdx_rpmsg.c-126-\ndrivers/cdx/controller/cdx_rpmsg.c:127:\tcdx_c = (struct cdx_controller *)cdx_rpmsg_id_table[0].driver_data;\ndrivers/cdx/controller/cdx_rpmsg.c-128-\tcdx_mcdi = cdx_c-\u003epriv;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=149=static void cdx_rpmsg_remove(struct rpmsg_device *rpdev)\ndrivers/cdx/controller/cdx_rpmsg.c-150-{\ndrivers/cdx/controller/cdx_rpmsg.c:151:\tstruct cdx_controller *cdx_c = dev_get_drvdata(\u0026rpdev-\u003edev);\ndrivers/cdx/controller/cdx_rpmsg.c-152-\tstruct cdx_mcdi *cdx_mcdi = cdx_c-\u003epriv;\n--\ndrivers/cdx/controller/cdx_rpmsg.c=169=int cdx_setup_rpmsg(struct platform_device *pdev)\ndrivers/cdx/controller/cdx_rpmsg.c-170-{\ndrivers/cdx/controller/cdx_rpmsg.c:171:\tstruct cdx_controller *cdx_c;\ndrivers/cdx/controller/cdx_rpmsg.c-172-\tstruct cdx_mcdi *cdx_mcdi;\n"
}

							input: 26702
							output: 33
							thoughts: 101

**CDX Deep Dive**

Okay, let's get down to brass tacks here. CDX... right. Composable DMA subsystem bus. That rings a bell – definitely in the AMD/Xilinx FPGA/SoC ecosystem. Specifically, it seems to be that crucial link between Versal ACAP/FPGA devices and the R5 core, relying on mechanisms like rpmsg/remoteproc. I'm thinking of communication via platform devices like `xlnx,versal-net-cdx` or related devices.

Time to confirm my initial hypothesis. I need to dive into the kernel source tree now. I'll start with those `Kconfig` files – `drivers/cdx/controller/Kconfig` and `drivers/cdx/Kconfig`. That should give me the configuration options, dependencies, and a clearer picture of exactly what components are involved and how this system is architected. That is where the key lies.

{
  "File": "drivers/cdx/Kconfig",
  "FirstLine": 1,
  "LineCount": 40
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0\n   2:\t#\n   3:\t# CDX bus configuration\n   4:\t#\n   5:\t# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.\n   6:\t#\n   7:\t\n   8:\tconfig CDX_BUS\n   9:\t\tbool \"CDX Bus driver\"\n  10:\t\tdepends on OF \u0026\u0026 ARM64 || COMPILE_TEST\n  11:\t\thelp\n  12:\t\t  Driver to enable Composable DMA Transfer(CDX) Bus. CDX bus\n  13:\t\t  exposes Fabric devices which uses composable DMA IP to the\n  14:\t\t  APU. CDX bus provides a mechanism for scanning and probing\n  15:\t\t  of CDX devices. CDX devices are memory mapped on system bus\n  16:\t\t  for embedded CPUs. CDX bus uses CDX controller and firmware\n  17:\t\t  to scan these CDX devices.\n  18:\t\n  19:\tsource \"drivers/cdx/controller/Kconfig\"\n"
}

							input: 27314
							output: 35
							thoughts: 42

**Analyzing CDX_BUS Configuration**

Okay, let's dive into this `CDX_BUS` configuration. The first thing I need to investigate is that `depends on OF && ARM64 || COMPILE_TEST` directive. That's crucial. I need to understand the implications of it requiring either the presence of the Device Tree, being on an ARM64 architecture, or the `COMPILE_TEST` option being active. Each of these conditions changes the context. 

Then, to understand the broader implications of `CDX_BUS`, I should really look at the Kconfig file for `drivers/cdx/controller/`. It is likely that the dependencies are clearly laid out there, which I can use to infer the bigger picture.

{
  "File": "drivers/cdx/controller/Kconfig",
  "FirstLine": 1,
  "LineCount": 40
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\t#\n   3:\t# CDX controller configuration\n   4:\t#\n   5:\t# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.\n   6:\t#\n   7:\t\n   8:\tif CDX_BUS\n   9:\t\n  10:\tconfig CDX_CONTROLLER\n  11:\t\ttristate \"CDX bus controller\"\n  12:\t\tdepends on HAS_DMA\n  13:\t\tselect REMOTEPROC\n  14:\t\tselect RPMSG\n  15:\t\thelp\n  16:\t\t  CDX controller drives the CDX bus. It interacts with\n  17:\t\t  firmware to get the hardware devices and registers with\n  18:\t\t  the CDX bus. Say Y to enable the CDX hardware driver.\n  19:\t\n  20:\t\t  If unsure, say N.\n  21:\t\n  22:\tendif\n"
}

							input: 27808
							output: 20
							thoughts: 131

**Analyzing the CDX Device Integration**

Okay, so the target architecture is definitely `amd64`, or x86_64, which is straightforward enough. Now, I need to figure out this `CDX_BUS` dependency. It seems like it's tied to `OF && ARM64 || COMPILE_TEST`. That's interesting. The question is, can a CDX device *ever* realistically be registered or even created in a standard virtualized environment like QEMU on `amd64`, or any common VM, even if `CONFIG_COMPILE_TEST` is enabled? That's a key question here. I need to understand the practicalities.

My main point of confusion stems from not knowing *how* a CDX device is created to begin with. What's the triggering mechanism? Let me drill down and examine the `cdx_device_add` function. I'll need to trace its call sites and understand all the ways devices are actually added to the CDX bus. That will illuminate the whole process. I'll focus on `cdx_device_add` and every single caller of that function. That's the core of where I need to start.

{
  "Expression": "cdx_device_add"
}

{
  "Output": "drivers/cdx/cdx.c=727=static int cdx_create_res_attr(struct cdx_device *cdx_dev, int num)\n--\ndrivers/cdx/cdx.c-755-\ndrivers/cdx/cdx.c:756:int cdx_device_add(struct cdx_dev_params *dev_params)\ndrivers/cdx/cdx.c-757-{\n--\ndrivers/cdx/cdx.c-841-}\ndrivers/cdx/cdx.c:842:EXPORT_SYMBOL_NS_GPL(cdx_device_add, \"CDX_BUS_CONTROLLER\");\ndrivers/cdx/cdx.c-843-\n--\ndrivers/cdx/cdx.h=62=void cdx_unregister_controller(struct cdx_controller *cdx);\n--\ndrivers/cdx/cdx.h-64-/**\ndrivers/cdx/cdx.h:65: * cdx_device_add - Add a CDX device. This function adds a CDX device\ndrivers/cdx/cdx.h-66- *\t\ton the CDX bus as per the device parameters provided\n--\ndrivers/cdx/cdx.h-72- */\ndrivers/cdx/cdx.h:73:int cdx_device_add(struct cdx_dev_params *dev_params);\ndrivers/cdx/cdx.h-74-\n--\ndrivers/cdx/controller/cdx_controller.c=93=static int cdx_scan_devices(struct cdx_controller *cdx)\n--\ndrivers/cdx/controller/cdx_controller.c-141-\t\t\t/* Add the device to the cdx bus */\ndrivers/cdx/controller/cdx_controller.c:142:\t\t\tret = cdx_device_add(\u0026dev_params);\ndrivers/cdx/controller/cdx_controller.c-143-\t\t\tif (ret) {\n"
}

							input: 28710
							output: 42
							thoughts: 71

**My Investigation into cdx_device_add**

Okay, so `cdx_device_add` – I need to understand this function. The code tells me it's *only* called by `cdx_scan_devices`, and that's found within `drivers/cdx/controller/cdx_controller.c`. That's a good starting point, right? To really grasp what's happening, I need to understand how the `cdx_controller` is probed in the first place. That will give me the context for when and why `cdx_device_add` gets called. So, I'm going to start by diving into `drivers/cdx/controller/cdx_controller.c` and see what the probing setup looks like.

{
  "File": "drivers/cdx/controller/cdx_controller.c",
  "FirstLine": 160,
  "LineCount": 100
}

{
  "Contents": " 160:\t\t.scan\t\t= cdx_scan_devices,\n 161:\t\t.dev_configure\t= cdx_configure_device,\n 162:\t};\n 163:\t\n 164:\tstatic int xlnx_cdx_probe(struct platform_device *pdev)\n 165:\t{\n 166:\t\tstruct cdx_controller *cdx;\n 167:\t\tstruct cdx_mcdi *cdx_mcdi;\n 168:\t\tint ret;\n 169:\t\n 170:\t\tcdx_mcdi = kzalloc_obj(*cdx_mcdi);\n 171:\t\tif (!cdx_mcdi)\n 172:\t\t\treturn -ENOMEM;\n 173:\t\n 174:\t\t/* Store the MCDI ops */\n 175:\t\tcdx_mcdi-\u003emcdi_ops = \u0026mcdi_ops;\n 176:\t\t/* MCDI FW: Initialize the FW path */\n 177:\t\tret = cdx_mcdi_init(cdx_mcdi);\n 178:\t\tif (ret) {\n 179:\t\t\tdev_err_probe(\u0026pdev-\u003edev, ret, \"MCDI Initialization failed\\n\");\n 180:\t\t\tgoto mcdi_init_fail;\n 181:\t\t}\n 182:\t\n 183:\t\tcdx = kzalloc_obj(*cdx);\n 184:\t\tif (!cdx) {\n 185:\t\t\tret = -ENOMEM;\n 186:\t\t\tgoto cdx_alloc_fail;\n 187:\t\t}\n 188:\t\tplatform_set_drvdata(pdev, cdx);\n 189:\t\n 190:\t\tcdx-\u003edev = \u0026pdev-\u003edev;\n 191:\t\tcdx-\u003epriv = cdx_mcdi;\n 192:\t\tcdx-\u003eops = \u0026cdx_ops;\n 193:\t\n 194:\t\t/* Create MSI domain */\n 195:\t\tif (IS_ENABLED(CONFIG_GENERIC_MSI_IRQ))\n 196:\t\t\tcdx-\u003emsi_domain = cdx_msi_domain_init(\u0026pdev-\u003edev);\n 197:\t\tif (!cdx-\u003emsi_domain) {\n 198:\t\t\tret = dev_err_probe(\u0026pdev-\u003edev, -ENODEV, \"cdx_msi_domain_init() failed\");\n 199:\t\t\tgoto cdx_msi_fail;\n 200:\t\t}\n 201:\t\n 202:\t\tret = cdx_setup_rpmsg(pdev);\n 203:\t\tif (ret) {\n 204:\t\t\tdev_err_probe(\u0026pdev-\u003edev, ret, \"Failed to register CDX RPMsg transport\\n\");\n 205:\t\t\tgoto cdx_rpmsg_fail;\n 206:\t\t}\n 207:\t\n 208:\t\treturn 0;\n 209:\t\n 210:\tcdx_rpmsg_fail:\n 211:\t\tirq_domain_remove(cdx-\u003emsi_domain);\n 212:\tcdx_msi_fail:\n 213:\t\tkfree(cdx);\n 214:\tcdx_alloc_fail:\n 215:\t\tcdx_mcdi_finish(cdx_mcdi);\n 216:\tmcdi_init_fail:\n 217:\t\tkfree(cdx_mcdi);\n 218:\t\n 219:\t\treturn ret;\n 220:\t}\n 221:\t\n 222:\tstatic void xlnx_cdx_remove(struct platform_device *pdev)\n 223:\t{\n 224:\t\tstruct cdx_controller *cdx = platform_get_drvdata(pdev);\n 225:\t\tstruct cdx_mcdi *cdx_mcdi = cdx-\u003epriv;\n 226:\t\n 227:\t\tcdx_destroy_rpmsg(pdev);\n 228:\t\n 229:\t\tirq_domain_remove(cdx-\u003emsi_domain);\n 230:\t\tkfree(cdx);\n 231:\t\n 232:\t\tcdx_mcdi_finish(cdx_mcdi);\n 233:\t\tkfree(cdx_mcdi);\n 234:\t}\n 235:\t\n 236:\tstatic const struct of_device_id cdx_match_table[] = {\n 237:\t\t{.compatible = \"xlnx,versal-net-cdx\",},\n 238:\t\t{ },\n 239:\t};\n 240:\t\n 241:\tMODULE_DEVICE_TABLE(of, cdx_match_table);\n 242:\t\n 243:\tstatic struct platform_driver cdx_pdriver = {\n 244:\t\t.driver = {\n 245:\t\t\t   .name = \"cdx-controller\",\n 246:\t\t\t   .of_match_table = cdx_match_table,\n 247:\t\t\t   },\n 248:\t\t.probe = xlnx_cdx_probe,\n 249:\t\t.remove = xlnx_cdx_remove,\n 250:\t};\n 251:\t\n 252:\tmodule_platform_driver(cdx_pdriver);\n 253:\t\n 254:\tMODULE_AUTHOR(\"AMD Inc.\");\n 255:\tMODULE_DESCRIPTION(\"CDX controller for AMD devices\");\n 256:\tMODULE_LICENSE(\"GPL\");\n 257:\tMODULE_IMPORT_NS(\"CDX_BUS_CONTROLLER\");\n"
}

							input: 30489
							output: 37
							thoughts: 47

Here's my analysis of the provided information, as if these were my internal thoughts:

**VFIO CDX Driver Investigation**

Okay, so we're looking at the VFIO driver for CDX bus devices – that's a good starting point. The file in question is `drivers/vfio/cdx/main.c`. My immediate instinct is to dive into that file and see what it's doing. `main.c` is usually the core, so it'll probably contain the essential initialization, device handling, and entry points for this VFIO driver. I need to understand how it's interacting with the CDX bus specifically, and how it's exposing that to the VFIO framework. I'll be looking for things like initialization routines, how it handles device discovery, how it sets up DMA mappings, and how it handles interrupts. This will give me a good handle on how this driver facilitates virtualized access to CDX devices. Let's get reading!

{
  "File": "drivers/vfio/cdx/main.c",
  "FirstLine": 1,
  "LineCount": 80
}

{
  "Contents": "   1:\t// SPDX-License-Identifier: GPL-2.0\n   2:\t/*\n   3:\t * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.\n   4:\t */\n   5:\t\n   6:\t#include \u003clinux/vfio.h\u003e\n   7:\t#include \u003clinux/cdx/cdx_bus.h\u003e\n   8:\t\n   9:\t#include \"private.h\"\n  10:\t\n  11:\tstatic int vfio_cdx_init_dev(struct vfio_device *core_vdev)\n  12:\t{\n  13:\t\tstruct vfio_cdx_device *vdev =\n  14:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n  15:\t\n  16:\t\tmutex_init(\u0026vdev-\u003ecdx_irqs_lock);\n  17:\t\treturn 0;\n  18:\t}\n  19:\t\n  20:\tstatic void vfio_cdx_release_dev(struct vfio_device *core_vdev)\n  21:\t{\n  22:\t\tstruct vfio_cdx_device *vdev =\n  23:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n  24:\t\n  25:\t\tmutex_destroy(\u0026vdev-\u003ecdx_irqs_lock);\n  26:\t}\n  27:\t\n  28:\tstatic int vfio_cdx_open_device(struct vfio_device *core_vdev)\n  29:\t{\n  30:\t\tstruct vfio_cdx_device *vdev =\n  31:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n  32:\t\tstruct cdx_device *cdx_dev = to_cdx_device(core_vdev-\u003edev);\n  33:\t\tint count = cdx_dev-\u003eres_count;\n  34:\t\tint i, ret;\n  35:\t\n  36:\t\tvdev-\u003eregions = kzalloc_objs(struct vfio_cdx_region, count,\n  37:\t\t\t\t\t     GFP_KERNEL_ACCOUNT);\n  38:\t\tif (!vdev-\u003eregions)\n  39:\t\t\treturn -ENOMEM;\n  40:\t\n  41:\t\tfor (i = 0; i \u003c count; i++) {\n  42:\t\t\tstruct resource *res = \u0026cdx_dev-\u003eres[i];\n  43:\t\n  44:\t\t\tvdev-\u003eregions[i].addr = res-\u003estart;\n  45:\t\t\tvdev-\u003eregions[i].size = resource_size(res);\n  46:\t\t\tvdev-\u003eregions[i].type = res-\u003eflags;\n  47:\t\t\t/*\n  48:\t\t\t * Only regions addressed with PAGE granularity may be\n  49:\t\t\t * MMAP'ed securely.\n  50:\t\t\t */\n  51:\t\t\tif (!(vdev-\u003eregions[i].addr \u0026 ~PAGE_MASK) \u0026\u0026\n  52:\t\t\t    !(vdev-\u003eregions[i].size \u0026 ~PAGE_MASK))\n  53:\t\t\t\tvdev-\u003eregions[i].flags |=\n  54:\t\t\t\t\t\tVFIO_REGION_INFO_FLAG_MMAP;\n  55:\t\t\tvdev-\u003eregions[i].flags |= VFIO_REGION_INFO_FLAG_READ;\n  56:\t\t\tif (!(cdx_dev-\u003eres[i].flags \u0026 IORESOURCE_READONLY))\n  57:\t\t\t\tvdev-\u003eregions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE;\n  58:\t\t}\n  59:\t\tret = cdx_dev_reset(core_vdev-\u003edev);\n  60:\t\tif (ret) {\n  61:\t\t\tkfree(vdev-\u003eregions);\n  62:\t\t\tvdev-\u003eregions = NULL;\n  63:\t\t\treturn ret;\n  64:\t\t}\n  65:\t\tret = cdx_clear_master(cdx_dev);\n  66:\t\tif (ret)\n  67:\t\t\tvdev-\u003eflags \u0026= ~BME_SUPPORT;\n  68:\t\telse\n  69:\t\t\tvdev-\u003eflags |= BME_SUPPORT;\n  70:\t\n  71:\t\treturn 0;\n  72:\t}\n  73:\t\n  74:\tstatic void vfio_cdx_close_device(struct vfio_device *core_vdev)\n  75:\t{\n  76:\t\tstruct vfio_cdx_device *vdev =\n  77:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n  78:\t\n  79:\t\tkfree(vdev-\u003eregions);\n  80:\t\tcdx_dev_reset(core_vdev-\u003edev);\n"
}

							input: 31989
							output: 39
							thoughts: 19

Okay, here's my interpretation of what's going on, formatted as you requested:

**Digging into the VFIO CDX Code**

Alright, time to dive deeper. I'm going to head into the `drivers/vfio/cdx/main.c` file. This is where the core of the CDX (Container Direct eXchange) implementation within VFIO (Virtual Function I/O) likely resides. My expectation is that this file will contain the fundamental logic for how the CDX device is initialized, how it handles requests, how it interacts with the underlying hardware, and how it's integrated within the VFIO framework. I'll be looking for things like initialization routines, interrupt handling, memory mapping functions, and the core request dispatch loop. I want to see how the software interacts with the hardware, what data structures are used to represent the CDX device, and how it handles potential errors. Understanding this `main.c` file is going to be crucial for figuring out the inner workings of the CDX implementation and how it fits into the broader VFIO architecture. This will be the key to understanding its performance characteristics and potential areas for optimization or debugging.

{
  "File": "drivers/vfio/cdx/main.c",
  "FirstLine": 240,
  "LineCount": 80
}

{
  "Contents": " 240:\t\t\treturn -ENOTTY;\n 241:\t\t}\n 242:\t}\n 243:\t\n 244:\tstatic int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,\n 245:\t\t\t\t      struct vm_area_struct *vma)\n 246:\t{\n 247:\t\tu64 size = vma-\u003evm_end - vma-\u003evm_start;\n 248:\t\tu64 pgoff, base;\n 249:\t\n 250:\t\tpgoff = vma-\u003evm_pgoff \u0026\n 251:\t\t\t((1U \u003c\u003c (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT)) - 1);\n 252:\t\tbase = pgoff \u003c\u003c PAGE_SHIFT;\n 253:\t\n 254:\t\tif (base + size \u003e region.size)\n 255:\t\t\treturn -EINVAL;\n 256:\t\n 257:\t\tvma-\u003evm_page_prot = pgprot_device(vma-\u003evm_page_prot);\n 258:\t\n 259:\t\treturn io_remap_pfn_range(vma, vma-\u003evm_start,\n 260:\t\t\t\t\t  (region.addr \u003e\u003e PAGE_SHIFT) + pgoff,\n 261:\t\t\t\t\t  size, vma-\u003evm_page_prot);\n 262:\t}\n 263:\t\n 264:\tstatic int vfio_cdx_mmap(struct vfio_device *core_vdev,\n 265:\t\t\t\t struct vm_area_struct *vma)\n 266:\t{\n 267:\t\tstruct vfio_cdx_device *vdev =\n 268:\t\t\tcontainer_of(core_vdev, struct vfio_cdx_device, vdev);\n 269:\t\tstruct cdx_device *cdx_dev = to_cdx_device(core_vdev-\u003edev);\n 270:\t\tunsigned int index;\n 271:\t\n 272:\t\tindex = vma-\u003evm_pgoff \u003e\u003e (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT);\n 273:\t\n 274:\t\tif (index \u003e= cdx_dev-\u003eres_count)\n 275:\t\t\treturn -EINVAL;\n 276:\t\n 277:\t\tif (!(vdev-\u003eregions[index].flags \u0026 VFIO_REGION_INFO_FLAG_MMAP))\n 278:\t\t\treturn -EINVAL;\n 279:\t\n 280:\t\tif (!(vdev-\u003eregions[index].flags \u0026 VFIO_REGION_INFO_FLAG_READ) \u0026\u0026\n 281:\t\t    (vma-\u003evm_flags \u0026 VM_READ))\n 282:\t\t\treturn -EPERM;\n 283:\t\n 284:\t\tif (!(vdev-\u003eregions[index].flags \u0026 VFIO_REGION_INFO_FLAG_WRITE) \u0026\u0026\n 285:\t\t    (vma-\u003evm_flags \u0026 VM_WRITE))\n 286:\t\t\treturn -EPERM;\n 287:\t\n 288:\t\treturn vfio_cdx_mmap_mmio(vdev-\u003eregions[index], vma);\n 289:\t}\n 290:\t\n 291:\tstatic const struct vfio_device_ops vfio_cdx_ops = {\n 292:\t\t.name\t\t= \"vfio-cdx\",\n 293:\t\t.init\t\t= vfio_cdx_init_dev,\n 294:\t\t.release\t= vfio_cdx_release_dev,\n 295:\t\t.open_device\t= vfio_cdx_open_device,\n 296:\t\t.close_device\t= vfio_cdx_close_device,\n 297:\t\t.ioctl\t\t= vfio_cdx_ioctl,\n 298:\t\t.get_region_info_caps = vfio_cdx_ioctl_get_region_info,\n 299:\t\t.device_feature = vfio_cdx_ioctl_feature,\n 300:\t\t.mmap\t\t= vfio_cdx_mmap,\n 301:\t\t.bind_iommufd\t= vfio_iommufd_physical_bind,\n 302:\t\t.unbind_iommufd\t= vfio_iommufd_physical_unbind,\n 303:\t\t.attach_ioas\t= vfio_iommufd_physical_attach_ioas,\n 304:\t};\n 305:\t\n 306:\tstatic int vfio_cdx_probe(struct cdx_device *cdx_dev)\n 307:\t{\n 308:\t\tstruct vfio_cdx_device *vdev;\n 309:\t\tstruct device *dev = \u0026cdx_dev-\u003edev;\n 310:\t\tint ret;\n 311:\t\n 312:\t\tvdev = vfio_alloc_device(vfio_cdx_device, vdev, dev,\n 313:\t\t\t\t\t \u0026vfio_cdx_ops);\n 314:\t\tif (IS_ERR(vdev))\n 315:\t\t\treturn PTR_ERR(vdev);\n 316:\t\n 317:\t\tret = vfio_register_group_dev(\u0026vdev-\u003evdev);\n 318:\t\tif (ret)\n 319:\t\t\tgoto out_uninit;\n"
}

							input: 33691
							output: 20
							thoughts: 89

Okay, here's my take on those thoughts, framed from my expert perspective:

**Investigating the `vfio_cdx` Driver**

Alright, so `vfio_cdx` is triggered, as expected, when a `cdx_device` structure aligns with the `vfio_cdx_driver`. My immediate thought is, "Okay, that's the setup, but what's *actually* happening with this CDX thing?". I need to understand the architectural landscape.

First, I'm going to quickly check for any sort of emulated or mocked implementations of CDX buses or devices within the Linux kernel itself, and of course, QEMU is a logical place to look. I'm thinking, are we talking about a real, physical device, or is this something virtualized, or perhaps a test harness? Finding mock implementations is critical for understanding the intent.

Then, I'll perform a broader search, a deeper dive into the kernel source. I'm going to throw a "cdx" search string across the whole codebase. I want to identify any other code that's responsible for registering either a CDX controller or a CDX device. This will help me understand the overall subsystem architecture, and how the `vfio_cdx` driver fits into the picture. Finding the registration points will let me see where this CDX technology originates from within the system. That should give me a solid handle on how it's used.

{
  "Expression": "cdx_driver_register"
}

{
  "Output": "drivers/cdx/cdx.c=628=EXPORT_SYMBOL_GPL(cdx_bus_type);\ndrivers/cdx/cdx.c-629-\ndrivers/cdx/cdx.c:630:int __cdx_driver_register(struct cdx_driver *cdx_driver,\ndrivers/cdx/cdx.c-631-\t\t\t  struct module *owner)\n--\ndrivers/cdx/cdx.c-646-}\ndrivers/cdx/cdx.c:647:EXPORT_SYMBOL_GPL(__cdx_driver_register);\ndrivers/cdx/cdx.c-648-\n--\ndrivers/vfio/cdx/main.c=348=static struct cdx_driver vfio_cdx_driver = {\n--\ndrivers/vfio/cdx/main.c-357-\ndrivers/vfio/cdx/main.c:358:module_driver(vfio_cdx_driver, cdx_driver_register, cdx_driver_unregister);\ndrivers/vfio/cdx/main.c-359-\n--\ninclude/linux/cdx/cdx_bus.h=198=struct cdx_driver {\n--\ninclude/linux/cdx/cdx_bus.h-212-/* Macro to avoid include chaining to get THIS_MODULE */\ninclude/linux/cdx/cdx_bus.h:213:#define cdx_driver_register(drv) \\\ninclude/linux/cdx/cdx_bus.h:214:\t__cdx_driver_register(drv, THIS_MODULE)\ninclude/linux/cdx/cdx_bus.h-215-\ninclude/linux/cdx/cdx_bus.h-216-/**\ninclude/linux/cdx/cdx_bus.h:217: * __cdx_driver_register - registers a CDX device driver\ninclude/linux/cdx/cdx_bus.h-218- * @cdx_driver: CDX driver to register\n--\ninclude/linux/cdx/cdx_bus.h-222- */\ninclude/linux/cdx/cdx_bus.h:223:int __must_check __cdx_driver_register(struct cdx_driver *cdx_driver,\ninclude/linux/cdx/cdx_bus.h-224-\t\t\t\t       struct module *owner);\n"
}

							input: 34715
							output: 19
							thoughts: 51

Okay, let's get down to brass tacks.

**Investigating `cdx_driver` Usage**

Alright, I need to get a clear picture of how this `cdx_driver` structure and `cdx_driver_register` function are being utilized throughout the kernel. My initial thought is to identify all the other drivers that are employing these elements. I'll need to do a thorough code search. The most direct approach is a grep for instances of `struct cdx_driver` and `cdx_driver` (case-insensitive perhaps, but let's start with case sensitive) across the entire kernel source tree. This should reveal all relevant locations where these are defined, referenced, or used. This granular approach should give me a complete overview of the existing ecosystem relying on this construct. With this info, I can then determine the best path forward.

{
  "Expression": "struct cdx_driver"
}

{
  "Output": "drivers/cdx/cdx.c=95=int cdx_dev_reset(struct device *dev)\n--\ndrivers/cdx/cdx.c-99-\tstruct cdx_device_config dev_config = {0};\ndrivers/cdx/cdx.c:100:\tstruct cdx_driver *cdx_drv;\ndrivers/cdx/cdx.c-101-\tint ret;\n--\ndrivers/cdx/cdx.c=263=static int cdx_bus_match(struct device *dev, const struct device_driver *drv)\n--\ndrivers/cdx/cdx.c-265-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:266:\tconst struct cdx_driver *cdx_drv = to_cdx_driver(drv);\ndrivers/cdx/cdx.c-267-\tconst struct cdx_device_id *found_id = NULL;\n--\ndrivers/cdx/cdx.c=302=static int cdx_probe(struct device *dev)\ndrivers/cdx/cdx.c-303-{\ndrivers/cdx/cdx.c:304:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-305-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\n--\ndrivers/cdx/cdx.c=328=static void cdx_remove(struct device *dev)\ndrivers/cdx/cdx.c-329-{\ndrivers/cdx/cdx.c:330:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-331-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\n--\ndrivers/cdx/cdx.c=337=static void cdx_shutdown(struct device *dev)\ndrivers/cdx/cdx.c-338-{\ndrivers/cdx/cdx.c:339:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-340-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\n--\ndrivers/cdx/cdx.c=349=static int cdx_dma_configure(struct device *dev)\ndrivers/cdx/cdx.c-350-{\ndrivers/cdx/cdx.c:351:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-352-\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\n--\ndrivers/cdx/cdx.c=373=static void cdx_dma_cleanup(struct device *dev)\ndrivers/cdx/cdx.c-374-{\ndrivers/cdx/cdx.c:375:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-376-\n--\ndrivers/cdx/cdx.c=628=EXPORT_SYMBOL_GPL(cdx_bus_type);\ndrivers/cdx/cdx.c-629-\ndrivers/cdx/cdx.c:630:int __cdx_driver_register(struct cdx_driver *cdx_driver,\ndrivers/cdx/cdx.c-631-\t\t\t  struct module *owner)\n--\ndrivers/cdx/cdx.c=647=EXPORT_SYMBOL_GPL(__cdx_driver_register);\ndrivers/cdx/cdx.c-648-\ndrivers/cdx/cdx.c:649:void cdx_driver_unregister(struct cdx_driver *cdx_driver)\ndrivers/cdx/cdx.c-650-{\n--\ndrivers/vfio/cdx/main.c=346=MODULE_DEVICE_TABLE(cdx, vfio_cdx_table);\ndrivers/vfio/cdx/main.c-347-\ndrivers/vfio/cdx/main.c:348:static struct cdx_driver vfio_cdx_driver = {\ndrivers/vfio/cdx/main.c-349-\t.probe\t\t= vfio_cdx_probe,\n--\ninclude/linux/cdx/cdx_bus.h=143=struct cdx_device {\n--\ninclude/linux/cdx/cdx_bus.h-181-/**\ninclude/linux/cdx/cdx_bus.h:182: * struct cdx_driver - CDX device driver\ninclude/linux/cdx/cdx_bus.h-183- * @driver: Generic device driver\n--\ninclude/linux/cdx/cdx_bus.h-197- */\ninclude/linux/cdx/cdx_bus.h:198:struct cdx_driver {\ninclude/linux/cdx/cdx_bus.h-199-\tstruct device_driver driver;\n--\ninclude/linux/cdx/cdx_bus.h-209-#define to_cdx_driver(_drv) \\\ninclude/linux/cdx/cdx_bus.h:210:\tcontainer_of_const(_drv, struct cdx_driver, driver)\ninclude/linux/cdx/cdx_bus.h-211-\n--\ninclude/linux/cdx/cdx_bus.h-222- */\ninclude/linux/cdx/cdx_bus.h:223:int __must_check __cdx_driver_register(struct cdx_driver *cdx_driver,\ninclude/linux/cdx/cdx_bus.h-224-\t\t\t\t       struct module *owner);\n--\ninclude/linux/cdx/cdx_bus.h-230- */\ninclude/linux/cdx/cdx_bus.h:231:void cdx_driver_unregister(struct cdx_driver *cdx_driver);\ninclude/linux/cdx/cdx_bus.h-232-\n"
}

							input: 36551
							output: 32
							thoughts: 178

**My Assessment of the VFIO-CDX Driver**

Okay, here's how I'm thinking through this. My starting point is the `vfio_cdx_driver`, which is registered when the `vfio-cdx` module loads. Makes perfect sense. However, I need to understand the full path to how a function like `vfio_cdx_mmap_mmio`, or any of the `vfio_cdx_*` functions, actually gets *called*. The critical path seems to be that a `cdx_device` has to exist and be bound to `vfio-cdx`. Then, a user-space process must open the VFIO device and call `mmap()`. That's the expected usage.

Now, I need to know if I can even create a `cdx_device` in the absence of actual hardware. My intuition tells me this should be possible for testing and emulation purposes. I need to dig into the `drivers/cdx/cdx.c` file to see how these devices are created. Specifically, I'm checking if there's any sysfs interface that allows the creation or "mocking" of CDX devices, or if their creation is entirely dependent on a `cdx_controller`. I need to figure out what's going on in `drivers/cdx/cdx.c`.

{
  "Expression": "cdx_",
  "PathPrefix": "drivers/cdx/cdx.c"
}

{
  "Output": "\nFull output is too long, showing 500 out of 665 lines.\nUse more precise expression if possible.\n\ndrivers/cdx/cdx.c-67-#include \u003clinux/idr.h\u003e\ndrivers/cdx/cdx.c:68:#include \u003clinux/cdx/cdx_bus.h\u003e\ndrivers/cdx/cdx.c-69-#include \u003clinux/iommu.h\u003e\n--\ndrivers/cdx/cdx.c-78-/* IDA for CDX controllers registered with the CDX bus */\ndrivers/cdx/cdx.c:79:static DEFINE_IDA(cdx_controller_ida);\ndrivers/cdx/cdx.c-80-/* Lock to protect controller ops */\ndrivers/cdx/cdx.c:81:static DEFINE_MUTEX(cdx_controller_lock);\ndrivers/cdx/cdx.c-82-/* Debugfs dir for cdx bus */\ndrivers/cdx/cdx.c:83:static struct dentry *cdx_debugfs_dir;\ndrivers/cdx/cdx.c-84-\ndrivers/cdx/cdx.c=85=static char *compat_node_name = \"xlnx,versal-net-cdx\";\ndrivers/cdx/cdx.c-86-\ndrivers/cdx/cdx.c:87:static void cdx_destroy_res_attr(struct cdx_device *cdx_dev, int num);\ndrivers/cdx/cdx.c-88-\ndrivers/cdx/cdx.c-89-/**\ndrivers/cdx/cdx.c:90: * cdx_dev_reset - Reset a CDX device\ndrivers/cdx/cdx.c-91- * @dev: CDX device\n--\ndrivers/cdx/cdx.c-94- */\ndrivers/cdx/cdx.c:95:int cdx_dev_reset(struct device *dev)\ndrivers/cdx/cdx.c-96-{\ndrivers/cdx/cdx.c:97:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:98:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c:99:\tstruct cdx_device_config dev_config = {0};\ndrivers/cdx/cdx.c:100:\tstruct cdx_driver *cdx_drv;\ndrivers/cdx/cdx.c-101-\tint ret;\ndrivers/cdx/cdx.c-102-\ndrivers/cdx/cdx.c:103:\tcdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-104-\t/* Notify driver that device is being reset */\ndrivers/cdx/cdx.c:105:\tif (cdx_drv \u0026\u0026 cdx_drv-\u003ereset_prepare)\ndrivers/cdx/cdx.c:106:\t\tcdx_drv-\u003ereset_prepare(cdx_dev);\ndrivers/cdx/cdx.c-107-\ndrivers/cdx/cdx.c-108-\tdev_config.type = CDX_DEV_RESET_CONF;\ndrivers/cdx/cdx.c:109:\tret = cdx-\u003eops-\u003edev_configure(cdx, cdx_dev-\u003ebus_num,\ndrivers/cdx/cdx.c:110:\t\t\t\t      cdx_dev-\u003edev_num, \u0026dev_config);\ndrivers/cdx/cdx.c-111-\tif (ret)\n--\ndrivers/cdx/cdx.c-114-\t/* Notify driver that device reset is complete */\ndrivers/cdx/cdx.c:115:\tif (cdx_drv \u0026\u0026 cdx_drv-\u003ereset_done)\ndrivers/cdx/cdx.c:116:\t\tcdx_drv-\u003ereset_done(cdx_dev);\ndrivers/cdx/cdx.c-117-\n--\ndrivers/cdx/cdx.c-119-}\ndrivers/cdx/cdx.c:120:EXPORT_SYMBOL_GPL(cdx_dev_reset);\ndrivers/cdx/cdx.c-121-\ndrivers/cdx/cdx.c-122-/**\ndrivers/cdx/cdx.c:123: * reset_cdx_device - Reset a CDX device\ndrivers/cdx/cdx.c-124- * @dev: CDX device\n--\ndrivers/cdx/cdx.c-130- */\ndrivers/cdx/cdx.c:131:static int reset_cdx_device(struct device *dev, void *data)\ndrivers/cdx/cdx.c-132-{\ndrivers/cdx/cdx.c:133:\treturn cdx_dev_reset(dev);\ndrivers/cdx/cdx.c-134-}\n--\ndrivers/cdx/cdx.c-136-/**\ndrivers/cdx/cdx.c:137: * cdx_unregister_device - Unregister a CDX device\ndrivers/cdx/cdx.c-138- * @dev: CDX device\n--\ndrivers/cdx/cdx.c-140- *\t  but is required here as the bus_for_each_dev() API expects\ndrivers/cdx/cdx.c:141: *\t  the passed function (cdx_unregister_device) to have this\ndrivers/cdx/cdx.c-142- *\t  as an argument.\n--\ndrivers/cdx/cdx.c-145- */\ndrivers/cdx/cdx.c:146:static int cdx_unregister_device(struct device *dev,\ndrivers/cdx/cdx.c-147-\t\t\t\t void *data)\ndrivers/cdx/cdx.c-148-{\ndrivers/cdx/cdx.c:149:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:150:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-151-\ndrivers/cdx/cdx.c:152:\tif (cdx_dev-\u003eis_bus) {\ndrivers/cdx/cdx.c:153:\t\tdevice_for_each_child(dev, NULL, cdx_unregister_device);\ndrivers/cdx/cdx.c:154:\t\tif (cdx_dev-\u003eenabled \u0026\u0026 cdx-\u003eops-\u003ebus_disable)\ndrivers/cdx/cdx.c:155:\t\t\tcdx-\u003eops-\u003ebus_disable(cdx, cdx_dev-\u003ebus_num);\ndrivers/cdx/cdx.c-156-\t} else {\ndrivers/cdx/cdx.c:157:\t\tcdx_destroy_res_attr(cdx_dev, MAX_CDX_DEV_RESOURCES);\ndrivers/cdx/cdx.c:158:\t\tdebugfs_remove_recursive(cdx_dev-\u003edebugfs_dir);\ndrivers/cdx/cdx.c-159-\t}\n--\ndrivers/cdx/cdx.c-161-\t/*\ndrivers/cdx/cdx.c:162:\t * Do not free cdx_dev here as it would be freed in\ndrivers/cdx/cdx.c:163:\t * cdx_device_release() called from within put_device().\ndrivers/cdx/cdx.c-164-\t */\ndrivers/cdx/cdx.c:165:\tdevice_del(\u0026cdx_dev-\u003edev);\ndrivers/cdx/cdx.c:166:\tput_device(\u0026cdx_dev-\u003edev);\ndrivers/cdx/cdx.c-167-\n--\ndrivers/cdx/cdx.c-170-\ndrivers/cdx/cdx.c:171:static void cdx_unregister_devices(const struct bus_type *bus)\ndrivers/cdx/cdx.c-172-{\ndrivers/cdx/cdx.c-173-\t/* Reset all the devices attached to cdx bus */\ndrivers/cdx/cdx.c:174:\tbus_for_each_dev(bus, NULL, NULL, cdx_unregister_device);\ndrivers/cdx/cdx.c-175-}\n--\ndrivers/cdx/cdx.c-177-/**\ndrivers/cdx/cdx.c:178: * cdx_match_one_device - Tell if a CDX device structure has a matching\ndrivers/cdx/cdx.c-179- *\t\t\t  CDX device id structure\n--\ndrivers/cdx/cdx.c-182- *\ndrivers/cdx/cdx.c:183: * Return: matching cdx_device_id structure or NULL if there is no match.\ndrivers/cdx/cdx.c-184- */\ndrivers/cdx/cdx.c:185:static inline const struct cdx_device_id *\ndrivers/cdx/cdx.c:186:cdx_match_one_device(const struct cdx_device_id *id,\ndrivers/cdx/cdx.c:187:\t\t     const struct cdx_device *dev)\ndrivers/cdx/cdx.c-188-{\n--\ndrivers/cdx/cdx.c-199-/**\ndrivers/cdx/cdx.c:200: * cdx_match_id - See if a CDX device matches a given cdx_id table\ndrivers/cdx/cdx.c-201- * @ids: array of CDX device ID structures to search in\n--\ndrivers/cdx/cdx.c-204- * Used by a driver to check whether a CDX device is in its list of\ndrivers/cdx/cdx.c:205: * supported devices. Returns the matching cdx_device_id structure or\ndrivers/cdx/cdx.c-206- * NULL if there is no match.\ndrivers/cdx/cdx.c-207- *\ndrivers/cdx/cdx.c:208: * Return: matching cdx_device_id structure or NULL if there is no match.\ndrivers/cdx/cdx.c-209- */\ndrivers/cdx/cdx.c:210:static inline const struct cdx_device_id *\ndrivers/cdx/cdx.c:211:cdx_match_id(const struct cdx_device_id *ids, struct cdx_device *dev)\ndrivers/cdx/cdx.c-212-{\n--\ndrivers/cdx/cdx.c-214-\t\twhile (ids-\u003evendor || ids-\u003edevice) {\ndrivers/cdx/cdx.c:215:\t\t\tif (cdx_match_one_device(ids, dev))\ndrivers/cdx/cdx.c-216-\t\t\t\treturn ids;\n--\ndrivers/cdx/cdx.c-222-\ndrivers/cdx/cdx.c:223:int cdx_set_master(struct cdx_device *cdx_dev)\ndrivers/cdx/cdx.c-224-{\ndrivers/cdx/cdx.c:225:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c:226:\tstruct cdx_device_config dev_config;\ndrivers/cdx/cdx.c-227-\tint ret = -EOPNOTSUPP;\n--\ndrivers/cdx/cdx.c-231-\tif (cdx-\u003eops-\u003edev_configure)\ndrivers/cdx/cdx.c:232:\t\tret = cdx-\u003eops-\u003edev_configure(cdx, cdx_dev-\u003ebus_num,\ndrivers/cdx/cdx.c:233:\t\t\t\t\t      cdx_dev-\u003edev_num, \u0026dev_config);\ndrivers/cdx/cdx.c-234-\n--\ndrivers/cdx/cdx.c-236-}\ndrivers/cdx/cdx.c:237:EXPORT_SYMBOL_GPL(cdx_set_master);\ndrivers/cdx/cdx.c-238-\ndrivers/cdx/cdx.c:239:int cdx_clear_master(struct cdx_device *cdx_dev)\ndrivers/cdx/cdx.c-240-{\ndrivers/cdx/cdx.c:241:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c:242:\tstruct cdx_device_config dev_config;\ndrivers/cdx/cdx.c-243-\tint ret = -EOPNOTSUPP;\n--\ndrivers/cdx/cdx.c-247-\tif (cdx-\u003eops-\u003edev_configure)\ndrivers/cdx/cdx.c:248:\t\tret = cdx-\u003eops-\u003edev_configure(cdx, cdx_dev-\u003ebus_num,\ndrivers/cdx/cdx.c:249:\t\t\t\t\t      cdx_dev-\u003edev_num, \u0026dev_config);\ndrivers/cdx/cdx.c-250-\n--\ndrivers/cdx/cdx.c-252-}\ndrivers/cdx/cdx.c:253:EXPORT_SYMBOL_GPL(cdx_clear_master);\ndrivers/cdx/cdx.c-254-\ndrivers/cdx/cdx.c-255-/**\ndrivers/cdx/cdx.c:256: * cdx_bus_match - device to driver matching callback\ndrivers/cdx/cdx.c-257- * @dev: the cdx device to match against\n--\ndrivers/cdx/cdx.c-262- */\ndrivers/cdx/cdx.c:263:static int cdx_bus_match(struct device *dev, const struct device_driver *drv)\ndrivers/cdx/cdx.c-264-{\ndrivers/cdx/cdx.c:265:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:266:\tconst struct cdx_driver *cdx_drv = to_cdx_driver(drv);\ndrivers/cdx/cdx.c:267:\tconst struct cdx_device_id *found_id = NULL;\ndrivers/cdx/cdx.c:268:\tconst struct cdx_device_id *ids;\ndrivers/cdx/cdx.c-269-\tint ret;\ndrivers/cdx/cdx.c-270-\ndrivers/cdx/cdx.c:271:\tif (cdx_dev-\u003eis_bus)\ndrivers/cdx/cdx.c-272-\t\treturn false;\ndrivers/cdx/cdx.c-273-\ndrivers/cdx/cdx.c:274:\tids = cdx_drv-\u003ematch_id_table;\ndrivers/cdx/cdx.c-275-\n--\ndrivers/cdx/cdx.c-280-\ndrivers/cdx/cdx.c:281:\tfound_id = cdx_match_id(ids, cdx_dev);\ndrivers/cdx/cdx.c-282-\tif (!found_id)\n--\ndrivers/cdx/cdx.c-295-\t\tids = found_id + 1;\ndrivers/cdx/cdx.c:296:\t\tfound_id = cdx_match_id(ids, cdx_dev);\ndrivers/cdx/cdx.c-297-\t} while (found_id);\n--\ndrivers/cdx/cdx.c-301-\ndrivers/cdx/cdx.c:302:static int cdx_probe(struct device *dev)\ndrivers/cdx/cdx.c-303-{\ndrivers/cdx/cdx.c:304:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c:305:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:306:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-307-\tint error;\n--\ndrivers/cdx/cdx.c-313-\tif (IS_ENABLED(CONFIG_GENERIC_MSI_IRQ) \u0026\u0026 cdx-\u003emsi_domain) {\ndrivers/cdx/cdx.c:314:\t\terror = msi_setup_device_data(\u0026cdx_dev-\u003edev);\ndrivers/cdx/cdx.c-315-\t\tif (error)\n--\ndrivers/cdx/cdx.c-318-\ndrivers/cdx/cdx.c:319:\terror = cdx_drv-\u003eprobe(cdx_dev);\ndrivers/cdx/cdx.c-320-\tif (error) {\n--\ndrivers/cdx/cdx.c-327-\ndrivers/cdx/cdx.c:328:static void cdx_remove(struct device *dev)\ndrivers/cdx/cdx.c-329-{\ndrivers/cdx/cdx.c:330:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c:331:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-332-\ndrivers/cdx/cdx.c:333:\tif (cdx_drv \u0026\u0026 cdx_drv-\u003eremove)\ndrivers/cdx/cdx.c:334:\t\tcdx_drv-\u003eremove(cdx_dev);\ndrivers/cdx/cdx.c-335-}\ndrivers/cdx/cdx.c-336-\ndrivers/cdx/cdx.c:337:static void cdx_shutdown(struct device *dev)\ndrivers/cdx/cdx.c-338-{\ndrivers/cdx/cdx.c:339:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c:340:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:341:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-342-\ndrivers/cdx/cdx.c:343:\tif (cdx_dev-\u003eis_bus \u0026\u0026 cdx_dev-\u003eenabled \u0026\u0026 cdx-\u003eops-\u003ebus_disable)\ndrivers/cdx/cdx.c:344:\t\tcdx-\u003eops-\u003ebus_disable(cdx, cdx_dev-\u003ebus_num);\ndrivers/cdx/cdx.c:345:\tif (cdx_drv \u0026\u0026 cdx_drv-\u003eshutdown)\ndrivers/cdx/cdx.c:346:\t\tcdx_drv-\u003eshutdown(cdx_dev);\ndrivers/cdx/cdx.c-347-}\ndrivers/cdx/cdx.c-348-\ndrivers/cdx/cdx.c:349:static int cdx_dma_configure(struct device *dev)\ndrivers/cdx/cdx.c-350-{\ndrivers/cdx/cdx.c:351:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c:352:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:353:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c:354:\tu32 input_id = cdx_dev-\u003ereq_id;\ndrivers/cdx/cdx.c-355-\tint ret;\n--\ndrivers/cdx/cdx.c-362-\ndrivers/cdx/cdx.c:363:\t/* @cdx_drv may not be valid when we're called from the IOMMU layer */\ndrivers/cdx/cdx.c:364:\tif (!ret \u0026\u0026 dev-\u003edriver \u0026\u0026 !cdx_drv-\u003edriver_managed_dma) {\ndrivers/cdx/cdx.c-365-\t\tret = iommu_device_use_default_domain(dev);\n--\ndrivers/cdx/cdx.c-372-\ndrivers/cdx/cdx.c:373:static void cdx_dma_cleanup(struct device *dev)\ndrivers/cdx/cdx.c-374-{\ndrivers/cdx/cdx.c:375:\tstruct cdx_driver *cdx_drv = to_cdx_driver(dev-\u003edriver);\ndrivers/cdx/cdx.c-376-\ndrivers/cdx/cdx.c:377:\tif (!cdx_drv-\u003edriver_managed_dma)\ndrivers/cdx/cdx.c-378-\t\tiommu_device_unuse_default_domain(dev);\n--\ndrivers/cdx/cdx.c-381-/* show configuration fields */\ndrivers/cdx/cdx.c:382:#define cdx_config_attr(field, format_string)\t\\\ndrivers/cdx/cdx.c-383-static ssize_t\t\\\ndrivers/cdx/cdx.c=384=field##_show(struct device *dev, struct device_attribute *attr, char *buf)\t\\\ndrivers/cdx/cdx.c-385-{\t\\\ndrivers/cdx/cdx.c:386:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\t\\\ndrivers/cdx/cdx.c:387:\treturn sysfs_emit(buf, format_string, cdx_dev-\u003efield);\t\\\ndrivers/cdx/cdx.c-388-}\t\\\ndrivers/cdx/cdx.c=389=static DEVICE_ATTR_RO(field)\ndrivers/cdx/cdx.c-390-\ndrivers/cdx/cdx.c:391:cdx_config_attr(vendor, \"0x%04x\\n\");\ndrivers/cdx/cdx.c:392:cdx_config_attr(device, \"0x%04x\\n\");\ndrivers/cdx/cdx.c:393:cdx_config_attr(subsystem_vendor, \"0x%04x\\n\");\ndrivers/cdx/cdx.c:394:cdx_config_attr(subsystem_device, \"0x%04x\\n\");\ndrivers/cdx/cdx.c:395:cdx_config_attr(revision, \"0x%02x\\n\");\ndrivers/cdx/cdx.c:396:cdx_config_attr(class, \"0x%06x\\n\");\ndrivers/cdx/cdx.c-397-\ndrivers/cdx/cdx.c=398=static ssize_t remove_store(struct device *dev,\n--\ndrivers/cdx/cdx.c-412-\ndrivers/cdx/cdx.c:413:\t\tret = cdx_unregister_device(dev, NULL);\ndrivers/cdx/cdx.c-414-\t\tif (ret)\n--\ndrivers/cdx/cdx.c=422=static ssize_t reset_store(struct device *dev, struct device_attribute *attr,\n--\ndrivers/cdx/cdx.c-424-{\ndrivers/cdx/cdx.c:425:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-426-\tbool val;\n--\ndrivers/cdx/cdx.c-434-\ndrivers/cdx/cdx.c:435:\tif (cdx_dev-\u003eis_bus)\ndrivers/cdx/cdx.c-436-\t\t/* Reset all the devices attached to cdx bus */\ndrivers/cdx/cdx.c:437:\t\tret = device_for_each_child(dev, NULL, reset_cdx_device);\ndrivers/cdx/cdx.c-438-\telse\ndrivers/cdx/cdx.c:439:\t\tret = cdx_dev_reset(dev);\ndrivers/cdx/cdx.c-440-\n--\ndrivers/cdx/cdx.c=445=static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,\n--\ndrivers/cdx/cdx.c-447-{\ndrivers/cdx/cdx.c:448:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-449-\ndrivers/cdx/cdx.c:450:\treturn sprintf(buf, \"cdx:v%04Xd%04Xsv%04Xsd%04Xc%06X\\n\", cdx_dev-\u003evendor,\ndrivers/cdx/cdx.c:451:\t\t\tcdx_dev-\u003edevice, cdx_dev-\u003esubsystem_vendor, cdx_dev-\u003esubsystem_device,\ndrivers/cdx/cdx.c:452:\t\t\tcdx_dev-\u003eclass);\ndrivers/cdx/cdx.c-453-}\n--\ndrivers/cdx/cdx.c=456=static ssize_t enable_store(struct device *dev, struct device_attribute *attr,\n--\ndrivers/cdx/cdx.c-458-{\ndrivers/cdx/cdx.c:459:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:460:\tstruct cdx_controller *cdx = cdx_dev-\u003ecdx;\ndrivers/cdx/cdx.c-461-\tbool enable;\n--\ndrivers/cdx/cdx.c-466-\ndrivers/cdx/cdx.c:467:\tif (enable == cdx_dev-\u003eenabled)\ndrivers/cdx/cdx.c-468-\t\treturn count;\n--\ndrivers/cdx/cdx.c-470-\tif (enable \u0026\u0026 cdx-\u003eops-\u003ebus_enable)\ndrivers/cdx/cdx.c:471:\t\tret = cdx-\u003eops-\u003ebus_enable(cdx, cdx_dev-\u003ebus_num);\ndrivers/cdx/cdx.c-472-\telse if (!enable \u0026\u0026 cdx-\u003eops-\u003ebus_disable)\ndrivers/cdx/cdx.c:473:\t\tret = cdx-\u003eops-\u003ebus_disable(cdx, cdx_dev-\u003ebus_num);\ndrivers/cdx/cdx.c-474-\telse\n--\ndrivers/cdx/cdx.c-477-\tif (!ret)\ndrivers/cdx/cdx.c:478:\t\tcdx_dev-\u003eenabled = enable;\ndrivers/cdx/cdx.c-479-\n--\ndrivers/cdx/cdx.c=483=static ssize_t enable_show(struct device *dev, struct device_attribute *attr, char *buf)\ndrivers/cdx/cdx.c-484-{\ndrivers/cdx/cdx.c:485:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-486-\ndrivers/cdx/cdx.c:487:\treturn sysfs_emit(buf, \"%u\\n\", cdx_dev-\u003eenabled);\ndrivers/cdx/cdx.c-488-}\ndrivers/cdx/cdx.c=489=static DEVICE_ATTR_RW(enable);\ndrivers/cdx/cdx.c-490-\ndrivers/cdx/cdx.c:491:static umode_t cdx_dev_attrs_are_visible(struct kobject *kobj, struct attribute *a, int n)\ndrivers/cdx/cdx.c-492-{\ndrivers/cdx/cdx.c-493-\tstruct device *dev = kobj_to_dev(kobj);\ndrivers/cdx/cdx.c:494:\tstruct cdx_device *cdx_dev;\ndrivers/cdx/cdx.c-495-\ndrivers/cdx/cdx.c:496:\tcdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:497:\tif (!cdx_dev-\u003eis_bus)\ndrivers/cdx/cdx.c-498-\t\treturn a-\u003emode;\n--\ndrivers/cdx/cdx.c-502-\ndrivers/cdx/cdx.c:503:static umode_t cdx_bus_attrs_are_visible(struct kobject *kobj, struct attribute *a, int n)\ndrivers/cdx/cdx.c-504-{\ndrivers/cdx/cdx.c-505-\tstruct device *dev = kobj_to_dev(kobj);\ndrivers/cdx/cdx.c:506:\tstruct cdx_device *cdx_dev;\ndrivers/cdx/cdx.c-507-\ndrivers/cdx/cdx.c:508:\tcdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c:509:\tif (cdx_dev-\u003eis_bus)\ndrivers/cdx/cdx.c-510-\t\treturn a-\u003emode;\n--\ndrivers/cdx/cdx.c-514-\ndrivers/cdx/cdx.c:515:static struct attribute *cdx_dev_attrs[] = {\ndrivers/cdx/cdx.c-516-\t\u0026dev_attr_remove.attr,\n--\ndrivers/cdx/cdx.c-527-\ndrivers/cdx/cdx.c:528:static const struct attribute_group cdx_dev_group = {\ndrivers/cdx/cdx.c:529:\t.attrs = cdx_dev_attrs,\ndrivers/cdx/cdx.c:530:\t.is_visible = cdx_dev_attrs_are_visible,\ndrivers/cdx/cdx.c-531-};\ndrivers/cdx/cdx.c-532-\ndrivers/cdx/cdx.c:533:static struct attribute *cdx_bus_dev_attrs[] = {\ndrivers/cdx/cdx.c-534-\t\u0026dev_attr_enable.attr,\n--\ndrivers/cdx/cdx.c-538-\ndrivers/cdx/cdx.c:539:static const struct attribute_group cdx_bus_dev_group = {\ndrivers/cdx/cdx.c:540:\t.attrs = cdx_bus_dev_attrs,\ndrivers/cdx/cdx.c:541:\t.is_visible = cdx_bus_attrs_are_visible,\ndrivers/cdx/cdx.c-542-};\ndrivers/cdx/cdx.c-543-\ndrivers/cdx/cdx.c:544:static const struct attribute_group *cdx_dev_groups[] = {\ndrivers/cdx/cdx.c:545:\t\u0026cdx_dev_group,\ndrivers/cdx/cdx.c:546:\t\u0026cdx_bus_dev_group,\ndrivers/cdx/cdx.c-547-\tNULL,\n--\ndrivers/cdx/cdx.c-549-\ndrivers/cdx/cdx.c:550:static int cdx_debug_resource_show(struct seq_file *s, void *data)\ndrivers/cdx/cdx.c-551-{\ndrivers/cdx/cdx.c:552:\tstruct cdx_device *cdx_dev = s-\u003eprivate;\ndrivers/cdx/cdx.c-553-\tint i;\n--\ndrivers/cdx/cdx.c-555-\tfor (i = 0; i \u003c MAX_CDX_DEV_RESOURCES; i++) {\ndrivers/cdx/cdx.c:556:\t\tstruct resource *res =  \u0026cdx_dev-\u003eres[i];\ndrivers/cdx/cdx.c-557-\n--\ndrivers/cdx/cdx.c-562-}\ndrivers/cdx/cdx.c:563:DEFINE_SHOW_ATTRIBUTE(cdx_debug_resource);\ndrivers/cdx/cdx.c-564-\ndrivers/cdx/cdx.c:565:static void cdx_device_debugfs_init(struct cdx_device *cdx_dev)\ndrivers/cdx/cdx.c-566-{\ndrivers/cdx/cdx.c:567:\tcdx_dev-\u003edebugfs_dir = debugfs_create_dir(dev_name(\u0026cdx_dev-\u003edev), cdx_debugfs_dir);\ndrivers/cdx/cdx.c:568:\tif (IS_ERR(cdx_dev-\u003edebugfs_dir))\ndrivers/cdx/cdx.c-569-\t\treturn;\ndrivers/cdx/cdx.c-570-\ndrivers/cdx/cdx.c:571:\tdebugfs_create_file(\"resource\", 0444, cdx_dev-\u003edebugfs_dir, cdx_dev,\ndrivers/cdx/cdx.c:572:\t\t\t    \u0026cdx_debug_resource_fops);\ndrivers/cdx/cdx.c-573-}\n--\ndrivers/cdx/cdx.c=575=static ssize_t rescan_store(const struct bus_type *bus,\n--\ndrivers/cdx/cdx.c-577-{\ndrivers/cdx/cdx.c:578:\tstruct cdx_controller *cdx;\ndrivers/cdx/cdx.c-579-\tstruct platform_device *pd;\n--\ndrivers/cdx/cdx.c-587-\ndrivers/cdx/cdx.c:588:\tguard(mutex)(\u0026cdx_controller_lock);\ndrivers/cdx/cdx.c-589-\ndrivers/cdx/cdx.c-590-\t/* Unregister all the devices on the bus */\ndrivers/cdx/cdx.c:591:\tcdx_unregister_devices(\u0026cdx_bus_type);\ndrivers/cdx/cdx.c-592-\n--\ndrivers/cdx/cdx.c=608=static BUS_ATTR_WO(rescan);\ndrivers/cdx/cdx.c-609-\ndrivers/cdx/cdx.c:610:static struct attribute *cdx_bus_attrs[] = {\ndrivers/cdx/cdx.c-611-\t\u0026bus_attr_rescan.attr,\n--\ndrivers/cdx/cdx.c-613-};\ndrivers/cdx/cdx.c:614:ATTRIBUTE_GROUPS(cdx_bus);\ndrivers/cdx/cdx.c-615-\ndrivers/cdx/cdx.c:616:const struct bus_type cdx_bus_type = {\ndrivers/cdx/cdx.c-617-\t.name\t\t= \"cdx\",\ndrivers/cdx/cdx.c-618-\t.driver_override = true,\ndrivers/cdx/cdx.c:619:\t.match\t\t= cdx_bus_match,\ndrivers/cdx/cdx.c:620:\t.probe\t\t= cdx_probe,\ndrivers/cdx/cdx.c:621:\t.remove\t\t= cdx_remove,\ndrivers/cdx/cdx.c:622:\t.shutdown\t= cdx_shutdown,\ndrivers/cdx/cdx.c:623:\t.dma_configure\t= cdx_dma_configure,\ndrivers/cdx/cdx.c:624:\t.dma_cleanup\t= cdx_dma_cleanup,\ndrivers/cdx/cdx.c:625:\t.bus_groups\t= cdx_bus_groups,\ndrivers/cdx/cdx.c:626:\t.dev_groups\t= cdx_dev_groups,\ndrivers/cdx/cdx.c-627-};\ndrivers/cdx/cdx.c:628:EXPORT_SYMBOL_GPL(cdx_bus_type);\ndrivers/cdx/cdx.c-629-\ndrivers/cdx/cdx.c:630:int __cdx_driver_register(struct cdx_driver *cdx_driver,\ndrivers/cdx/cdx.c-631-\t\t\t  struct module *owner)\n--\ndrivers/cdx/cdx.c-634-\ndrivers/cdx/cdx.c:635:\tcdx_driver-\u003edriver.owner = owner;\ndrivers/cdx/cdx.c:636:\tcdx_driver-\u003edriver.bus = \u0026cdx_bus_type;\ndrivers/cdx/cdx.c-637-\ndrivers/cdx/cdx.c:638:\terror = driver_register(\u0026cdx_driver-\u003edriver);\ndrivers/cdx/cdx.c-639-\tif (error) {\ndrivers/cdx/cdx.c-640-\t\tpr_err(\"driver_register() failed for %s: %d\\n\",\ndrivers/cdx/cdx.c:641:\t\t       cdx_driver-\u003edriver.name, error);\ndrivers/cdx/cdx.c-642-\t\treturn error;\n--\ndrivers/cdx/cdx.c-646-}\ndrivers/cdx/cdx.c:647:EXPORT_SYMBOL_GPL(__cdx_driver_register);\ndrivers/cdx/cdx.c-648-\ndrivers/cdx/cdx.c:649:void cdx_driver_unregister(struct cdx_driver *cdx_driver)\ndrivers/cdx/cdx.c-650-{\ndrivers/cdx/cdx.c:651:\tdriver_unregister(\u0026cdx_driver-\u003edriver);\ndrivers/cdx/cdx.c-652-}\ndrivers/cdx/cdx.c:653:EXPORT_SYMBOL_GPL(cdx_driver_unregister);\ndrivers/cdx/cdx.c-654-\ndrivers/cdx/cdx.c:655:static void cdx_device_release(struct device *dev)\ndrivers/cdx/cdx.c-656-{\ndrivers/cdx/cdx.c:657:\tstruct cdx_device *cdx_dev = to_cdx_device(dev);\ndrivers/cdx/cdx.c-658-\ndrivers/cdx/cdx.c:659:\tkfree(cdx_dev);\ndrivers/cdx/cdx.c-660-}\ndrivers/cdx/cdx.c-661-\ndrivers/cdx/cdx.c:662:static const struct vm_operations_struct cdx_phys_vm_ops = {\ndrivers/cdx/cdx.c-663-#ifdef CONFIG_HAVE_IOREMAP_PROT\n--\ndrivers/cdx/cdx.c-668-/**\ndrivers/cdx/cdx.c:669: * cdx_mmap_resource - map a CDX resource into user memory space\ndrivers/cdx/cdx.c-670- * @fp: File pointer. Not used in this function, but required where\n--\ndrivers/cdx/cdx.c-679- */\ndrivers/cdx/cdx.c:680:static int cdx_mmap_resource(struct file *fp, struct kobject *kobj,\ndrivers/cdx/cdx.c-681-\t\t\t     const struct bin_attribute *attr,\n--\ndrivers/cdx/cdx.c-683-{\ndrivers/cdx/cdx.c:684:\tstruct cdx_device *cdx_dev = to_cdx_device(kobj_to_dev(kobj));\ndrivers/cdx/cdx.c-685-\tint num = (unsigned long)attr-\u003eprivate;\n--\ndrivers/cdx/cdx.c-688-\ndrivers/cdx/cdx.c:689:\tres = \u0026cdx_dev-\u003eres[num];\ndrivers/cdx/cdx.c-690-\tif (iomem_is_exclusive(res-\u003estart))\n--\ndrivers/cdx/cdx.c-693-\t/* Make sure the caller is mapping a valid resource for this device */\ndrivers/cdx/cdx.c:694:\tsize = ((cdx_resource_len(cdx_dev, num) - 1) \u003e\u003e PAGE_SHIFT) + 1;\ndrivers/cdx/cdx.c-695-\tif (vma-\u003evm_pgoff + vma_pages(vma) \u003e size)\n--\ndrivers/cdx/cdx.c-702-\tvma-\u003evm_page_prot = pgprot_device(vma-\u003evm_page_prot);\ndrivers/cdx/cdx.c:703:\tvma-\u003evm_pgoff += (cdx_resource_start(cdx_dev, num) \u003e\u003e PAGE_SHIFT);\ndrivers/cdx/cdx.c:704:\tvma-\u003evm_ops = \u0026cdx_phys_vm_ops;\ndrivers/cdx/cdx.c-705-\treturn io_remap_pfn_range(vma, vma-\u003evm_start, vma-\u003evm_pgoff,\n--\ndrivers/cdx/cdx.c-709-\ndrivers/cdx/cdx.c:710:static void cdx_destroy_res_attr(struct cdx_device *cdx_dev, int num)\ndrivers/cdx/cdx.c-711-{\n--\ndrivers/cdx/cdx.c-717-\ndrivers/cdx/cdx.c:718:\t\tres_attr = cdx_dev-\u003eres_attr[i];\ndrivers/cdx/cdx.c-719-\t\tif (res_attr) {\ndrivers/cdx/cdx.c:720:\t\t\tsysfs_remove_bin_file(\u0026cdx_dev-\u003edev.kobj, res_attr);\ndrivers/cdx/cdx.c-721-\t\t\tkfree(res_attr);\n--\ndrivers/cdx/cdx.c-726-#define CDX_RES_ATTR_NAME_LEN\t10\ndrivers/cdx/cdx.c:727:static int cdx_create_res_attr(struct cdx_device *cdx_dev, int num)\ndrivers/cdx/cdx.c-728-{\n--\ndrivers/cdx/cdx.c-740-\ndrivers/cdx/cdx.c:741:\tcdx_dev-\u003eres_attr[num] = res_attr;\ndrivers/cdx/cdx.c-742-\tsprintf(res_attr_name, \"resource%d\", num);\ndrivers/cdx/cdx.c-743-\ndrivers/cdx/cdx.c:744:\tres_attr-\u003emmap = cdx_mmap_resource;\ndrivers/cdx/cdx.c-745-\tres_attr-\u003eattr.name = res_attr_name;\ndrivers/cdx/cdx.c-746-\tres_attr-\u003eattr.mode = 0600;\ndrivers/cdx/cdx.c:747:\tres_attr-\u003esize = cdx_resource_len(cdx_dev, num);\ndrivers/cdx/cdx.c-748-\tres_attr-\u003eprivate = (void *)(unsigned long)num;\ndrivers/cdx/cdx.c:749:\tret = sysfs_create_bin_file(\u0026cdx_dev-\u003edev.kobj, res_attr);\ndrivers/cdx/cdx.c-750-\tif (ret)\n--\n\n"
}

							input: 48281
							output: 20
							thoughts: 472

**My Assessment of the CDX Controller Registration and Emulation**

Okay, let's break this down. My understanding is that the CDX controller registration begins within `drivers/cdx/controller/cdx_controller.c`. The `xlnx_cdx_probe` function is triggered by a platform device match for `"xlnx,versal-net-cdx"`. It then establishes a connection to a remoteproc instance (specifically, `r5_core_node`). This involves setting up an RPMSG driver. Once the RPMSG channel becomes operational, `cdx_rpmsg_probe` is invoked, which then schedules `cdx_rpmsg_post_probe_work`, ultimately leading to `cdx_rpmsg_post_probe` and, finally, `cdx_register_controller`. Communication with the firmware running on the Versal ACAP R5 core happens via MCDI (remoteproc mailbox/rpmsg) during either `rescan_store` or `cdx_scan_devices`, which are used to enumerate buses and devices.

Now, a critical point: **there's no software emulator for the CDX controller or any of its associated devices within QEMU, GCE, or even the mainline Linux kernel.** This makes things difficult. Furthermore, the architecture in question here is `amd64`, while the `CDX_BUS` functionality appears to depend on a combination of `OF && ARM64 || COMPILE_TEST`. This indicates that the Versal ACAP/CDX bus is specific to AMD/Xilinx ARM64 SoC FPGA hardware and needs physical hardware and firmware (MCDI communication with the R5 core) to operate.

Considering the given instructions, specifically Section 2, where we're looking for scenarios where `WorthFuzzing=false`, two criteria immediately stand out.

* **Structurally unreachable hardware:** CDX falls squarely into this category. It requires a Versal ACAP SoC, a specific hardware platform with vendor-specific PCIe interactions, which are not emulated in standard QEMU.
* **Unreachable execution paths:** The code's dependence on the ARM64 architecture, coupled with its reliance on specific firmware and hardware, makes it impossible to reach these execution paths on amd64 systems.

To be absolutely certain, I need to double-check if there's *any* way to instantiate the CDX controller on amd64 or within standard QEMU. Are there any platform devices or mock drivers that might simulate the CDX behavior? I need to search for `"versal-net-cdx"` or any other CDX-related keywords to make sure there's nothing that I'm missing. Given my current understanding, I am highly confident that this path is not worth fuzzing, based on the requirements I was given.

{
  "Expression": "versal-net-cdx"
}

{
  "Output": "Documentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-3----\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml:4:$id: http://devicetree.org/schemas/bus/xlnx,versal-net-cdx.yaml#\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-5-$schema: http://devicetree.org/meta-schemas/core.yaml#\n--\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml=37=properties:\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-38-  compatible:\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml:39:    const: xlnx,versal-net-cdx\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-40-\n--\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml=70=examples:\n--\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-72-    cdx {\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml:73:        compatible = \"xlnx,versal-net-cdx\";\nDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml-74-        #address-cells = \u003c1\u003e;\n--\nMAINTAINERS=1058=S:\tMaintained\nMAINTAINERS:1059:F:\tDocumentation/devicetree/bindings/bus/xlnx,versal-net-cdx.yaml\nMAINTAINERS-1060-F:\tdrivers/cdx/*\n--\ndrivers/cdx/cdx.c=83=static struct dentry *cdx_debugfs_dir;\ndrivers/cdx/cdx.c-84-\ndrivers/cdx/cdx.c:85:static char *compat_node_name = \"xlnx,versal-net-cdx\";\ndrivers/cdx/cdx.c-86-\n--\ndrivers/cdx/controller/cdx_controller.c=236=static const struct of_device_id cdx_match_table[] = {\ndrivers/cdx/controller/cdx_controller.c:237:\t{.compatible = \"xlnx,versal-net-cdx\",},\ndrivers/cdx/controller/cdx_controller.c-238-\t{ },\n"
}

							input: 50054
							output: 148
							thoughts: 403

**Analysis of the Target Code and Fuzzing Feasibility**

Okay, after this thorough review, I'm absolutely certain. Everything points directly to an AMD/Xilinx Versal FPGA / ARM64 platform. This isn't just a generic ARM64 thing; it requires physical AMD/Xilinx Versal ACAP hardware with R5 firmware communication. Even though the target architecture is `amd64` initially, the requirement is still physical hardware.

Specifically, that `vfio_cdx_mmap_mmio` function in `drivers/vfio/cdx/main.c` – it's only ever called through the `mmap` callback of the `vfio-cdx` driver. And that driver is *only* registered for CDX devices, which are enabled by `CONFIG_VFIO_CDX` and `CONFIG_CDX_BUS`. You can't just spin this up in QEMU or GCE. Without that physical CDX hardware, without the controller to discover and register CDX devices, this code is structurally unreachable within standard virtualized environments.

Let's quickly verify our `set-results` fields. Yep, `WorthFuzzing` is unequivocally `false`. The `Reasoning` should be crystal clear. The `FocusSymbols`? Empty. No focus symbols. And the `EnableConfigs`? Also empty. Perfect.

Let's double-check the tool call formatting. Okay, `FocusSymbols: []`, `EnableConfigs: []`, and the `Reasoning`: "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX driver (drivers/vfio/cdx/main.c), which supports AMD/Xilinx Versal CDX bus devices. CDX bus devices require physical AMD/Xilinx Versal ACAP hardware and ARM64 firmware communication (MCDI over rpmsg), which cannot be emulated or instantiated in standard virtualized environments (e.g. QEMU on amd64). Hence, the modified code is structurally unreachable for fuzzing." That's good.

Alright, time to call `set-results`.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX bus driver (drivers/vfio/cdx/main.c). The CDX bus is specific to AMD/Xilinx Versal ACAP platforms and requires physical hardware/firmware (rpmsg/MCDI communication with an R5 management controller) to discover and register CDX devices. Because there are no emulated CDX controllers or devices in standard virtualized QEMU environments (particularly on amd64), the modified code is structurally unreachable.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The modified function vfio_cdx_mmap_mmio is part of the VFIO CDX bus driver (drivers/vfio/cdx/main.c). The CDX bus is specific to AMD/Xilinx Versal ACAP platforms and requires physical hardware/firmware (rpmsg/MCDI communication with an R5 management controller) to discover and register CDX devices. Because there are no emulated CDX controllers or devices in standard virtualized QEMU environments (particularly on amd64), the modified code is structurally unreachable.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

LLM Calls Summary:
Total Calls	Total Tokens	Avg Tokens	Total Duration (Seconds)	Avg Duration (Seconds)

Tool Calls Summary:
Total Calls	Total Duration (Seconds)	Avg Duration (Seconds)