AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch modifies error handling in __cdnsp_gadget_init() within drivers/usb/cdns3/cdnsp-gadget.c. This code belongs to the Cadence CDNSP device controller driver (cdnsp-udc-pci), which requires proprietary Cadence PCI hardware (PCI_VENDOR_ID_CDNS 0x17cd). This hardware is not emulated in standard QEMU or virtualized fuzzing environments, making the modified code structurally unreachable.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit 9324269006822f12ed63ab7182dc3eac8217a2f3\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Sep 19 18:07:30 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c\nindex 6b3815f8a6e5b..53c395631955e 100644\n--- a/drivers/usb/cdns3/cdnsp-gadget.c\n+++ b/drivers/usb/cdns3/cdnsp-gadget.c\n@@ -1990,6 +1990,7 @@ static int __cdnsp_gadget_init(struct cdns *cdns)\n \tkfree(pdev-\u003esetup_buf);\n free_pdev:\n \tkfree(pdev);\n+\tpm_runtime_put_autosuspend(cdns-\u003edev);\n \n \treturn ret;\n }\n"
}

core

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies error handling in __cdnsp_gadget_init() within drivers/usb/cdns3/cdnsp-gadget.c. This code belongs to the Cadence CDNSP device controller driver (cdnsp-udc-pci), which requires proprietary Cadence PCI hardware (PCI_VENDOR_ID_CDNS 0x17cd). This hardware is not emulated in standard QEMU or virtualized fuzzing environments, making the modified code 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 9324269006822f12ed63ab7182dc3eac8217a2f3
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Sep 19 18:07:30 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c
index 6b3815f8a6e5b..53c395631955e 100644
--- a/drivers/usb/cdns3/cdnsp-gadget.c
+++ b/drivers/usb/cdns3/cdnsp-gadget.c
@@ -1990,6 +1990,7 @@ static int __cdnsp_gadget_init(struct cdns *cdns)
 	kfree(pdev->setup_buf);
 free_pdev:
 	kfree(pdev);
+	pm_runtime_put_autosuspend(cdns->dev);
 
 	return ret;
 }

gemini-3.8-flash

null

null

							input: 2866
							output: 44
							thoughts: 146
						

**Analyzing a USB Gadget Driver Patch**

Okay, let's dive into this patch. My initial thought is to understand the implications of this change, so I need to see what's being altered in `drivers/usb/cdns3/cdnsp-gadget.c`. It looks like we're dealing with a specific function, `__cdnsp_gadget_init`, and specifically, cleanup in case of failure. The patch shows the addition of `pm_runtime_put_autosuspend(cdns->dev)`. This strongly suggests we're integrating power management, likely auto-suspension, into this driver's initialization or teardown sequence.

To get the full picture, I need to understand the surrounding context. I'll need to use my usual tools to read the file and get a fuller view of where this change fits, so I can understand the exact conditions and what kind of power management the code uses. I'll search the file to grasp the bigger picture for this addition. Is this to enable power savings on an error path? Is it to release the device from an active power state? Getting the full surrounding context is essential for a thorough understanding.

{
  "File": "drivers/usb/cdns3/cdnsp-gadget.c",
  "FirstLine": 1940,
  "LineCount": 65
}

{
  "Contents": "1940:\t\n1941:\t\tpdev-\u003esetup_buf = kzalloc(CDNSP_EP0_SETUP_SIZE, GFP_KERNEL);\n1942:\t\tif (!pdev-\u003esetup_buf)\n1943:\t\t\tgoto free_pdev;\n1944:\t\n1945:\t\t/*\n1946:\t\t * Controller supports not aligned buffer but it should improve\n1947:\t\t * performance.\n1948:\t\t */\n1949:\t\tpdev-\u003egadget.quirk_ep_out_aligned_size = true;\n1950:\t\n1951:\t\tret = cdnsp_gen_setup(pdev);\n1952:\t\tif (ret) {\n1953:\t\t\tdev_err(pdev-\u003edev, \"Generic initialization failed %d\\n\", ret);\n1954:\t\t\tgoto free_setup;\n1955:\t\t}\n1956:\t\n1957:\t\tret = cdnsp_gadget_init_endpoints(pdev);\n1958:\t\tif (ret) {\n1959:\t\t\tdev_err(pdev-\u003edev, \"failed to initialize endpoints\\n\");\n1960:\t\t\tgoto halt_pdev;\n1961:\t\t}\n1962:\t\n1963:\t\tret = usb_add_gadget_udc(pdev-\u003edev, \u0026pdev-\u003egadget);\n1964:\t\tif (ret) {\n1965:\t\t\tdev_err(pdev-\u003edev, \"failed to register udc\\n\");\n1966:\t\t\tgoto free_endpoints;\n1967:\t\t}\n1968:\t\n1969:\t\tret = devm_request_threaded_irq(pdev-\u003edev, cdns-\u003edev_irq,\n1970:\t\t\t\t\t\tcdnsp_irq_handler,\n1971:\t\t\t\t\t\tcdnsp_thread_irq_handler, IRQF_SHARED,\n1972:\t\t\t\t\t\tdev_name(pdev-\u003edev), pdev);\n1973:\t\tif (ret)\n1974:\t\t\tgoto del_gadget;\n1975:\t\n1976:\t\treturn 0;\n1977:\t\n1978:\tdel_gadget:\n1979:\t\tusb_del_gadget(\u0026pdev-\u003egadget);\n1980:\t\tcdnsp_gadget_free_endpoints(pdev);\n1981:\t\tusb_put_gadget(\u0026pdev-\u003egadget);\n1982:\t\tgoto halt_pdev;\n1983:\tfree_endpoints:\n1984:\t\tcdnsp_gadget_free_endpoints(pdev);\n1985:\thalt_pdev:\n1986:\t\tcdnsp_halt(pdev);\n1987:\t\tcdnsp_reset(pdev);\n1988:\t\tcdnsp_mem_cleanup(pdev);\n1989:\tfree_setup:\n1990:\t\tkfree(pdev-\u003esetup_buf);\n1991:\tfree_pdev:\n1992:\t\tkfree(pdev);\n1993:\t\tpm_runtime_put_autosuspend(cdns-\u003edev);\n1994:\t\n1995:\t\treturn ret;\n1996:\t}\n1997:\t\n1998:\tstatic void cdnsp_gadget_exit(struct cdns *cdns)\n1999:\t{\n2000:\t\tstruct cdnsp_device *pdev = cdns-\u003egadget_dev;\n2001:\t\n2002:\t\tdevm_free_irq(pdev-\u003edev, cdns-\u003edev_irq, pdev);\n2003:\t\tpm_runtime_put_autosuspend(cdns-\u003edev);\n2004:\t\tusb_del_gadget(\u0026pdev-\u003egadget);\n"
}

gemini-3.8-flash

null

null

							input: 4292
							output: 44
							thoughts: 17
						

Okay, here's my interpretation of what's going on, summarized from the perspective of someone familiar with the codebase:

**Analyzing the Initialization Sequence**

Alright, let's dive into the guts of this `__cdnsp_gadget_init` function. The name itself suggests this is a crucial initialization routine, probably for a "gadget" or component that leverages the CDN infrastructure. I need to understand what this thing *does* during startup. My immediate concern is what dependencies it pulls in, what configurations it loads, and ultimately, what actions it takes to establish itself within the application. I know how critical these initial states can be. I'm focusing on finding the starting point, the entry point, for understanding how the system works.

{
  "File": "drivers/usb/cdns3/cdnsp-gadget.c",
  "FirstLine": 1915,
  "LineCount": 40
}

{
  "Contents": "1915:\t\tpdev-\u003edev = cdns-\u003edev;\n1916:\t\tpdev-\u003eregs = cdns-\u003edev_regs;\n1917:\t\tmax_speed = usb_get_maximum_speed(cdns-\u003edev);\n1918:\t\n1919:\t\tswitch (max_speed) {\n1920:\t\tcase USB_SPEED_FULL:\n1921:\t\tcase USB_SPEED_HIGH:\n1922:\t\tcase USB_SPEED_SUPER:\n1923:\t\tcase USB_SPEED_SUPER_PLUS:\n1924:\t\t\tbreak;\n1925:\t\tdefault:\n1926:\t\t\tdev_err(cdns-\u003edev, \"invalid speed parameter %d\\n\", max_speed);\n1927:\t\t\tfallthrough;\n1928:\t\tcase USB_SPEED_UNKNOWN:\n1929:\t\t\t/* Default to SSP */\n1930:\t\t\tmax_speed = USB_SPEED_SUPER_PLUS;\n1931:\t\t\tbreak;\n1932:\t\t}\n1933:\t\n1934:\t\tpdev-\u003egadget.ops = \u0026cdnsp_gadget_ops;\n1935:\t\tpdev-\u003egadget.name = \"cdnsp-gadget\";\n1936:\t\tpdev-\u003egadget.speed = USB_SPEED_UNKNOWN;\n1937:\t\tpdev-\u003egadget.sg_supported = 1;\n1938:\t\tpdev-\u003egadget.max_speed = max_speed;\n1939:\t\tpdev-\u003egadget.lpm_capable = 1;\n1940:\t\n1941:\t\tpdev-\u003esetup_buf = kzalloc(CDNSP_EP0_SETUP_SIZE, GFP_KERNEL);\n1942:\t\tif (!pdev-\u003esetup_buf)\n1943:\t\t\tgoto free_pdev;\n1944:\t\n1945:\t\t/*\n1946:\t\t * Controller supports not aligned buffer but it should improve\n1947:\t\t * performance.\n1948:\t\t */\n1949:\t\tpdev-\u003egadget.quirk_ep_out_aligned_size = true;\n1950:\t\n1951:\t\tret = cdnsp_gen_setup(pdev);\n1952:\t\tif (ret) {\n1953:\t\t\tdev_err(pdev-\u003edev, \"Generic initialization failed %d\\n\", ret);\n1954:\t\t\tgoto free_setup;\n"
}

gemini-3.8-flash

null

null

							input: 5137
							output: 22
							thoughts: 23
						

Okay, here's my interpretation of that thought process, assuming I'm an expert in this field, presented as a first-person summary:

**Digging into `__cdnsp_gadget_init`**

Alright, so I'm looking at `__cdnsp_gadget_init`. That name definitely rings a bell, probably related to some CDN or network service provisioning. My immediate question is, where is this function actually being *used*? I need to trace the calls to understand its purpose and how it fits into the broader architecture. Knowing its location is critical. Also, I need to know the context of the device driver it relates to. Without those pieces of information, I'm just looking at a function name in a vacuum. It could be critical for understanding a security flaw, or it may just be an initialisation function for a feature I can ignore. Let's start with a code search and see what we can find.

{
  "Expression": "__cdnsp_gadget_init"
}

{
  "Output": "drivers/usb/cdns3/cdnsp-gadget.c=1823=static int cdnsp_gen_setup(struct cdnsp_device *pdev)\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-1899-\ndrivers/usb/cdns3/cdnsp-gadget.c:1900:static int __cdnsp_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/cdnsp-gadget.c-1901-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c=2061=int cdnsp_gadget_init(struct cdns *cdns)\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-2068-\ndrivers/usb/cdns3/cdnsp-gadget.c:2069:\trdrv-\u003estart\t= __cdnsp_gadget_init;\ndrivers/usb/cdns3/cdnsp-gadget.c-2070-\trdrv-\u003estop\t= cdnsp_gadget_exit;\n"
}

gemini-3.8-flash

null

null

							input: 5662
							output: 44
							thoughts: 33
						

Okay, here's my interpretation of what's going through my mind as I approach those lines of code, presented as a first-person account assuming expertise:

**Diving into the CDNS3 Gadget Driver**

Alright, time to get my hands dirty. Let's see... the task is to understand lines 1900-1920 in `drivers/usb/cdns3/cdnsp-gadget.c`. Right, that puts me squarely in the Cadence USB 3.0 controller driver, specifically the gadget mode section. So, this code likely deals with how the USB controller presents itself as a device to a host, as opposed to acting as the host itself.

Given the line number range, I'm betting this isn't low-level register initialization or interrupt handling. That's usually earlier in the file. I’d guess we're in the realm of either:

*   **Endpoint management:** Creating, configuring, or tearing down USB endpoints. That’s a common area for gadget driver code.
*   **Request handling:** Dealing with incoming USB requests from the host, queueing them, or passing them to the appropriate function.
*   **Status updates:** This could be reporting on the state of transfers, errors, or any other feedback mechanism between the device and the host.
*   **Possibly, Control Requests:** Depending on what lines 1900-1920 cover.

I'll be looking for clues in the surrounding code. What functions are being called? What data structures are being used? Are there any obvious `struct` accesses, bitwise operations, or calls to USB-specific library functions? Specifically, I'll be looking for references to `usb_request`, `usb_endpoint`, `cdns3_gadget_dev`, or similar structures that are likely core to the device's functionality. My mental map of the driver structure should guide me.

Alright, time to dig in. Let's start reading...

{
  "File": "drivers/usb/cdns3/cdnsp-gadget.c",
  "FirstLine": 1900,
  "LineCount": 25
}

{
  "Contents": "1900:\tstatic int __cdnsp_gadget_init(struct cdns *cdns)\n1901:\t{\n1902:\t\tstruct cdnsp_device *pdev;\n1903:\t\tu32 max_speed;\n1904:\t\tint ret = -ENOMEM;\n1905:\t\n1906:\t\tcdns_drd_gadget_on(cdns);\n1907:\t\n1908:\t\tpdev = kzalloc_obj(*pdev);\n1909:\t\tif (!pdev)\n1910:\t\t\treturn -ENOMEM;\n1911:\t\n1912:\t\tpm_runtime_get_sync(cdns-\u003edev);\n1913:\t\n1914:\t\tcdns-\u003egadget_dev = pdev;\n1915:\t\tpdev-\u003edev = cdns-\u003edev;\n1916:\t\tpdev-\u003eregs = cdns-\u003edev_regs;\n1917:\t\tmax_speed = usb_get_maximum_speed(cdns-\u003edev);\n1918:\t\n1919:\t\tswitch (max_speed) {\n1920:\t\tcase USB_SPEED_FULL:\n1921:\t\tcase USB_SPEED_HIGH:\n1922:\t\tcase USB_SPEED_SUPER:\n1923:\t\tcase USB_SPEED_SUPER_PLUS:\n1924:\t\t\tbreak;\n"
}

gemini-3.8-flash

null

null

							input: 6533
							output: 29
							thoughts: 151
						

**Analyzing a Device Power Management Issue**

Okay, so I'm seeing this snippet of code: `pm_runtime_get_sync(cdns->dev)`. Right away, I'm thinking, "Power management." That `get_sync` call suggests they're trying to grab a resource, probably before accessing the hardware. And then, *bam*, if it fails, we have `kfree(pdev)` and `pm_runtime_put_autosuspend(cdns->dev)`. Interesting. They're releasing the power management and freeing the private data on error.

My mind immediately races to context. What *is* `cdns3` or `cdnsp`? What's the hardware, and what's the driver? I need to understand this device to even begin to understand the problem. Is this a common chip? Is it something I've dealt with before? Can I readily reproduce this?

Now I need to check: Can I actually *test* this? Is `cdnsp` or `cdns3` something that shows up in `syzkaller` setups? Are there available virtualized environments (QEMU, GCE) where I might be able to reproduce the error? If I'm lucky, it's something I can get running locally.

Okay, let's head straight to the driver source. I need to understand the device initialization flow, the power management interaction, and any error paths. I'm going to look at `drivers/usb/cdns3`. First, I'll dive into the `Kconfig` and `Makefile`. That should give me a good overview of the driver's configuration options and build dependencies. This will help me quickly understand what is going on here. This looks like a USB driver, and a pretty specific one, too.

{
  "Expression": "cdnsp",
  "PathPrefix": "drivers/usb/cdns3"
}

{
  "Output": "\nFull output is too long, showing 500 out of 4223 lines.\nUse more precise expression if possible.\n\ndrivers/usb/cdns3/Kconfig=96=config USB_CDNSP_PCI\n--\ndrivers/usb/cdns3/Kconfig-103-\t  If you choose to build this driver is a dynamically linked\ndrivers/usb/cdns3/Kconfig:104:\t  module, the module will be called cdnsp.ko.\ndrivers/usb/cdns3/Kconfig-105-endif\n--\ndrivers/usb/cdns3/Makefile=3=CFLAGS_cdns3-trace.o\t\t\t\t:= -I$(src)\ndrivers/usb/cdns3/Makefile:4:CFLAGS_cdnsp-trace.o\t\t\t\t:= -I$(src)\ndrivers/usb/cdns3/Makefile-5-\n--\ndrivers/usb/cdns3/Makefile=27=obj-$(CONFIG_USB_CDNS3_STARFIVE)\t\t+= cdns3-starfive.o\ndrivers/usb/cdns3/Makefile-28-\ndrivers/usb/cdns3/Makefile:29:cdnsp-udc-pci-y\t\t\t\t\t:= cdnsp-pci.o\ndrivers/usb/cdns3/Makefile-30-\n--\ndrivers/usb/cdns3/Makefile=32=ifeq ($(CONFIG_USB),m)\ndrivers/usb/cdns3/Makefile:33:obj-m\t\t\t\t\t\t+= cdnsp-udc-pci.o\ndrivers/usb/cdns3/Makefile-34-else\ndrivers/usb/cdns3/Makefile:35:obj-$(CONFIG_USB_CDNSP_PCI) \t\t\t+= cdnsp-udc-pci.o\ndrivers/usb/cdns3/Makefile-36-endif\ndrivers/usb/cdns3/Makefile=37=endif\ndrivers/usb/cdns3/Makefile-38-\ndrivers/usb/cdns3/Makefile:39:cdnsp-udc-pci-$(CONFIG_USB_CDNSP_GADGET)\t+= cdnsp-ring.o cdnsp-gadget.o \\\ndrivers/usb/cdns3/Makefile:40:\t\t\t\t\t\t   cdnsp-mem.o cdnsp-ep0.o\ndrivers/usb/cdns3/Makefile-41-\ndrivers/usb/cdns3/Makefile=42=ifneq ($(CONFIG_USB_CDNSP_GADGET),)\ndrivers/usb/cdns3/Makefile:43:cdnsp-udc-pci-$(CONFIG_TRACING)\t\t\t+= cdnsp-trace.o\ndrivers/usb/cdns3/Makefile-44-endif\n--\ndrivers/usb/cdns3/cdnsp-debug.h-12-\ndrivers/usb/cdns3/cdnsp-debug.h:13:static inline const char *cdnsp_trb_comp_code_string(u8 status)\ndrivers/usb/cdns3/cdnsp-debug.h-14-{\n--\ndrivers/usb/cdns3/cdnsp-debug.h-78-\ndrivers/usb/cdns3/cdnsp-debug.h:79:static inline const char *cdnsp_trb_type_string(u8 type)\ndrivers/usb/cdns3/cdnsp-debug.h-80-{\n--\ndrivers/usb/cdns3/cdnsp-debug.h-138-\ndrivers/usb/cdns3/cdnsp-debug.h:139:static inline const char *cdnsp_ring_type_string(enum cdnsp_ring_type type)\ndrivers/usb/cdns3/cdnsp-debug.h-140-{\n--\ndrivers/usb/cdns3/cdnsp-debug.h-160-\ndrivers/usb/cdns3/cdnsp-debug.h:161:static inline char *cdnsp_slot_state_string(u32 state)\ndrivers/usb/cdns3/cdnsp-debug.h-162-{\n--\ndrivers/usb/cdns3/cdnsp-debug.h-176-\ndrivers/usb/cdns3/cdnsp-debug.h:177:static inline const char *cdnsp_decode_trb(char *str, size_t size, u32 field0,\ndrivers/usb/cdns3/cdnsp-debug.h-178-\t\t\t\t\t   u32 field1, u32 field2, u32 field3)\n--\ndrivers/usb/cdns3/cdnsp-debug.h-192-\t\t\t\tfield1, field0, GET_INTR_TARGET(field2),\ndrivers/usb/cdns3/cdnsp-debug.h:193:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-194-\t\t\t\tfield3 \u0026 TRB_IOC ? 'I' : 'i',\n--\ndrivers/usb/cdns3/cdnsp-debug.h-207-\t\t\t\tTRB_TO_EP_INDEX(field3),\ndrivers/usb/cdns3/cdnsp-debug.h:208:\t\t\t\tcdnsp_trb_type_string(type), field1, field0,\ndrivers/usb/cdns3/cdnsp-debug.h:209:\t\t\t\tcdnsp_trb_comp_code_string(GET_COMP_CODE(field2)),\ndrivers/usb/cdns3/cdnsp-debug.h-210-\t\t\t\tEVENT_TRB_LEN(field2), TRB_TO_SLOT_ID(field3),\n--\ndrivers/usb/cdns3/cdnsp-debug.h-215-\t\tret = scnprintf(str, size, \"%s: flags %c\",\ndrivers/usb/cdns3/cdnsp-debug.h:216:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-217-\t\t\t\tfield3 \u0026 TRB_CYCLE ? 'C' : 'c');\n--\ndrivers/usb/cdns3/cdnsp-debug.h-224-\t\t\t\t\"flags %c:%c:%c\",\ndrivers/usb/cdns3/cdnsp-debug.h:225:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-226-\t\t\t\tfield0 \u0026 0xff,\n--\ndrivers/usb/cdns3/cdnsp-debug.h-244-\t\t\t\t\"intr %ld flags %c:%c:%c:%c:%c:%c:%c\",\ndrivers/usb/cdns3/cdnsp-debug.h:245:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-246-\t\t\t\tfield1, field0, TRB_LEN(field2),\n--\ndrivers/usb/cdns3/cdnsp-debug.h-263-\t\t\t\tGET_INTR_TARGET(field2),\ndrivers/usb/cdns3/cdnsp-debug.h:264:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-265-\t\t\t\tfield3 \u0026 TRB_IOC ? 'I' : 'i',\n--\ndrivers/usb/cdns3/cdnsp-debug.h-277-\t\t\t\t\"flags %c:%c:%c:%c:%c:%c:%c:%c:%c\",\ndrivers/usb/cdns3/cdnsp-debug.h:278:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-279-\t\t\t\tfield1, field0, TRB_LEN(field2),\n--\ndrivers/usb/cdns3/cdnsp-debug.h-294-\t\tret = scnprintf(str, size, \"%s: flags %c\",\ndrivers/usb/cdns3/cdnsp-debug.h:295:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-296-\t\t\t\tfield3 \u0026 TRB_CYCLE ? 'C' : 'c');\n--\ndrivers/usb/cdns3/cdnsp-debug.h-299-\t\tret = scnprintf(str, size, \"%s: slot %ld flags %c\",\ndrivers/usb/cdns3/cdnsp-debug.h:300:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-301-\t\t\t\tTRB_TO_SLOT_ID(field3),\n--\ndrivers/usb/cdns3/cdnsp-debug.h-306-\t\t\t\t\"%s: ctx %08x%08x slot %ld flags %c:%c\",\ndrivers/usb/cdns3/cdnsp-debug.h:307:\t\t\t\tcdnsp_trb_type_string(type), field1, field0,\ndrivers/usb/cdns3/cdnsp-debug.h-308-\t\t\t\tTRB_TO_SLOT_ID(field3),\n--\ndrivers/usb/cdns3/cdnsp-debug.h-314-\t\t\t\t\"%s: ctx %08x%08x slot %ld flags %c:%c\",\ndrivers/usb/cdns3/cdnsp-debug.h:315:\t\t\t\tcdnsp_trb_type_string(type), field1, field0,\ndrivers/usb/cdns3/cdnsp-debug.h-316-\t\t\t\tTRB_TO_SLOT_ID(field3),\n--\ndrivers/usb/cdns3/cdnsp-debug.h-322-\t\t\t\t\"%s: ctx %08x%08x slot %ld flags %c\",\ndrivers/usb/cdns3/cdnsp-debug.h:323:\t\t\t\tcdnsp_trb_type_string(type), field1, field0,\ndrivers/usb/cdns3/cdnsp-debug.h-324-\t\t\t\tTRB_TO_SLOT_ID(field3),\n--\ndrivers/usb/cdns3/cdnsp-debug.h-330-\t\t\t\t\"%s: ep%d%s(%d) ctx %08x%08x slot %ld flags %c %c\",\ndrivers/usb/cdns3/cdnsp-debug.h:331:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-332-\t\t\t\tep_num, ep_id % 2 ? \"out\" : \"in\",\n--\ndrivers/usb/cdns3/cdnsp-debug.h-340-\t\t\t\t\"%s: ep%d%s(%d) slot %ld sp %d flags %c\",\ndrivers/usb/cdns3/cdnsp-debug.h:341:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-342-\t\t\t\tep_num, ep_id % 2 ? \"out\" : \"in\",\n--\ndrivers/usb/cdns3/cdnsp-debug.h-350-\t\t\t\t\"%s: ep%d%s(%d) deq %08x%08x stream %ld slot %ld  flags %c\",\ndrivers/usb/cdns3/cdnsp-debug.h:351:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-352-\t\t\t\tep_num, ep_id % 2 ? \"out\" : \"in\",\n--\ndrivers/usb/cdns3/cdnsp-debug.h-359-\t\tret = scnprintf(str, size, \"%s: slot %ld flags %c\",\ndrivers/usb/cdns3/cdnsp-debug.h:360:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-361-\t\t\t\tTRB_TO_SLOT_ID(field3),\n--\ndrivers/usb/cdns3/cdnsp-debug.h-368-\t\t\t\t\"%s: ep%d%s(%d) H_SID %x%s%s D_SID %lx flags %c:%c\",\ndrivers/usb/cdns3/cdnsp-debug.h:369:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-370-\t\t\t\tep_num, ep_id % 2 ? \"out\" : \"in\",\n--\ndrivers/usb/cdns3/cdnsp-debug.h-380-\t\t\t\t\"type '%s' -\u003e raw %08x %08x %08x %08x\",\ndrivers/usb/cdns3/cdnsp-debug.h:381:\t\t\t\tcdnsp_trb_type_string(type),\ndrivers/usb/cdns3/cdnsp-debug.h-382-\t\t\t\tfield0, field1, field2, field3);\n--\ndrivers/usb/cdns3/cdnsp-debug.h-390-\ndrivers/usb/cdns3/cdnsp-debug.h:391:static inline const char *cdnsp_decode_slot_context(u32 info, u32 info2,\ndrivers/usb/cdns3/cdnsp-debug.h-392-\t\t\t\t\t\t    u32 int_target, u32 state)\n--\ndrivers/usb/cdns3/cdnsp-debug.h-422-\t\t       GET_INTR_TARGET(int_target), state \u0026 DEV_ADDR_MASK,\ndrivers/usb/cdns3/cdnsp-debug.h:423:\t\t       cdnsp_slot_state_string(GET_SLOT_STATE(state)));\ndrivers/usb/cdns3/cdnsp-debug.h-424-\n--\ndrivers/usb/cdns3/cdnsp-debug.h-427-\ndrivers/usb/cdns3/cdnsp-debug.h:428:static inline const char *cdnsp_portsc_link_state_string(u32 portsc)\ndrivers/usb/cdns3/cdnsp-debug.h-429-{\n--\ndrivers/usb/cdns3/cdnsp-debug.h-463-\ndrivers/usb/cdns3/cdnsp-debug.h:464:static inline const char *cdnsp_decode_portsc(char *str, size_t size,\ndrivers/usb/cdns3/cdnsp-debug.h-465-\t\t\t\t\t      u32 portsc)\n--\ndrivers/usb/cdns3/cdnsp-debug.h-472-\t\t\tportsc \u0026 PORT_PED ? \"Enabled\" : \"Disabled\",\ndrivers/usb/cdns3/cdnsp-debug.h:473:\t\t\tcdnsp_portsc_link_state_string(portsc),\ndrivers/usb/cdns3/cdnsp-debug.h-474-\t\t\tDEV_PORT_SPEED(portsc));\n--\ndrivers/usb/cdns3/cdnsp-debug.h-498-\ndrivers/usb/cdns3/cdnsp-debug.h:499:static inline const char *cdnsp_ep_state_string(u8 state)\ndrivers/usb/cdns3/cdnsp-debug.h-500-{\n--\ndrivers/usb/cdns3/cdnsp-debug.h-516-\ndrivers/usb/cdns3/cdnsp-debug.h:517:static inline const char *cdnsp_ep_type_string(u8 type)\ndrivers/usb/cdns3/cdnsp-debug.h-518-{\n--\ndrivers/usb/cdns3/cdnsp-debug.h-538-\ndrivers/usb/cdns3/cdnsp-debug.h:539:static inline const char *cdnsp_decode_ep_context(char *str, size_t size,\ndrivers/usb/cdns3/cdnsp-debug.h-540-\t\t\t\t\t\t  u32 info, u32 info2,\n--\ndrivers/usb/cdns3/cdnsp-debug.h-566-\tret = scnprintf(str, size, \"State %s mult %d max P. Streams %d %s\",\ndrivers/usb/cdns3/cdnsp-debug.h:567:\t\t\tcdnsp_ep_state_string(ep_state), mult,\ndrivers/usb/cdns3/cdnsp-debug.h-568-\t\t\tmax_pstr, lsa ? \"LSA \" : \"\");\n--\ndrivers/usb/cdns3/cdnsp-debug.h-575-\t\t\t \"Type %s %sburst %d maxp %d deq %016llx \",\ndrivers/usb/cdns3/cdnsp-debug.h:576:\t\t\t cdnsp_ep_type_string(ep_type), hid ? \"HID\" : \"\",\ndrivers/usb/cdns3/cdnsp-debug.h-577-\t\t\t burst, maxp, deq);\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-14-\ndrivers/usb/cdns3/cdnsp-ep0.c:15:#include \"cdnsp-gadget.h\"\ndrivers/usb/cdns3/cdnsp-ep0.c:16:#include \"cdnsp-trace.h\"\ndrivers/usb/cdns3/cdnsp-ep0.c-17-\ndrivers/usb/cdns3/cdnsp-ep0.c:18:static void cdnsp_ep0_stall(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-ep0.c-19-{\ndrivers/usb/cdns3/cdnsp-ep0.c:20:\tstruct cdnsp_request *preq;\ndrivers/usb/cdns3/cdnsp-ep0.c:21:\tstruct cdnsp_ep *pep;\ndrivers/usb/cdns3/cdnsp-ep0.c-22-\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-26-\tif (pdev-\u003ethree_stage_setup) {\ndrivers/usb/cdns3/cdnsp-ep0.c:27:\t\tcdnsp_halt_endpoint(pdev, pep, true);\ndrivers/usb/cdns3/cdnsp-ep0.c-28-\ndrivers/usb/cdns3/cdnsp-ep0.c-29-\t\tif (preq)\ndrivers/usb/cdns3/cdnsp-ep0.c:30:\t\t\tcdnsp_gadget_giveback(pep, preq, -ECONNRESET);\ndrivers/usb/cdns3/cdnsp-ep0.c-31-\t} else {\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-36-\ndrivers/usb/cdns3/cdnsp-ep0.c:37:\t\tcdnsp_status_stage(pdev);\ndrivers/usb/cdns3/cdnsp-ep0.c-38-\t}\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-40-\ndrivers/usb/cdns3/cdnsp-ep0.c:41:static int cdnsp_ep0_delegate_req(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-42-\t\t\t\t  struct usb_ctrlrequest *ctrl)\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-52-\ndrivers/usb/cdns3/cdnsp-ep0.c:53:static int cdnsp_ep0_set_config(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-54-\t\t\t\tstruct usb_ctrlrequest *ctrl)\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-63-\tcase USB_STATE_ADDRESS:\ndrivers/usb/cdns3/cdnsp-ep0.c:64:\t\ttrace_cdnsp_ep0_set_config(\"from Address state\");\ndrivers/usb/cdns3/cdnsp-ep0.c-65-\t\tbreak;\ndrivers/usb/cdns3/cdnsp-ep0.c-66-\tcase USB_STATE_CONFIGURED:\ndrivers/usb/cdns3/cdnsp-ep0.c:67:\t\ttrace_cdnsp_ep0_set_config(\"from Configured state\");\ndrivers/usb/cdns3/cdnsp-ep0.c-68-\t\tbreak;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-73-\ndrivers/usb/cdns3/cdnsp-ep0.c:74:\tret = cdnsp_ep0_delegate_req(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-75-\tif (ret)\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-83-\ndrivers/usb/cdns3/cdnsp-ep0.c:84:static int cdnsp_ep0_set_address(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-85-\t\t\t\t struct usb_ctrlrequest *ctrl)\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-87-\tenum usb_device_state state = pdev-\u003egadget.state;\ndrivers/usb/cdns3/cdnsp-ep0.c:88:\tstruct cdnsp_slot_ctx *slot_ctx;\ndrivers/usb/cdns3/cdnsp-ep0.c-89-\tunsigned int slot_state;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-99-\ndrivers/usb/cdns3/cdnsp-ep0.c:100:\tslot_ctx = cdnsp_get_slot_ctx(\u0026pdev-\u003eout_ctx);\ndrivers/usb/cdns3/cdnsp-ep0.c-101-\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-108-\ndrivers/usb/cdns3/cdnsp-ep0.c:109:\tslot_ctx = cdnsp_get_slot_ctx(\u0026pdev-\u003eout_ctx);\ndrivers/usb/cdns3/cdnsp-ep0.c-110-\tslot_state = GET_SLOT_STATE(le32_to_cpu(slot_ctx-\u003edev_state));\ndrivers/usb/cdns3/cdnsp-ep0.c-111-\tif (slot_state == SLOT_STATE_ADDRESSED)\ndrivers/usb/cdns3/cdnsp-ep0.c:112:\t\tcdnsp_reset_device(pdev);\ndrivers/usb/cdns3/cdnsp-ep0.c-113-\ndrivers/usb/cdns3/cdnsp-ep0.c-114-\t/*set device address*/\ndrivers/usb/cdns3/cdnsp-ep0.c:115:\tret = cdnsp_setup_device(pdev, SETUP_CONTEXT_ADDRESS);\ndrivers/usb/cdns3/cdnsp-ep0.c-116-\tif (ret)\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-126-\ndrivers/usb/cdns3/cdnsp-ep0.c:127:int cdnsp_status_stage(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-ep0.c-128-{\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-131-\ndrivers/usb/cdns3/cdnsp-ep0.c:132:\treturn cdnsp_ep_enqueue(pdev-\u003eep0_preq.pep, \u0026pdev-\u003eep0_preq);\ndrivers/usb/cdns3/cdnsp-ep0.c-133-}\ndrivers/usb/cdns3/cdnsp-ep0.c-134-\ndrivers/usb/cdns3/cdnsp-ep0.c:135:static int cdnsp_w_index_to_ep_index(u16 wIndex)\ndrivers/usb/cdns3/cdnsp-ep0.c-136-{\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-143-\ndrivers/usb/cdns3/cdnsp-ep0.c:144:static int cdnsp_ep0_handle_status(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-145-\t\t\t\t   struct usb_ctrlrequest *ctrl)\ndrivers/usb/cdns3/cdnsp-ep0.c-146-{\ndrivers/usb/cdns3/cdnsp-ep0.c:147:\tstruct cdnsp_ep *pep;\ndrivers/usb/cdns3/cdnsp-ep0.c-148-\t__le16 *response;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-169-\t\t */\ndrivers/usb/cdns3/cdnsp-ep0.c:170:\t\treturn cdnsp_ep0_delegate_req(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-171-\tcase USB_RECIP_ENDPOINT:\ndrivers/usb/cdns3/cdnsp-ep0.c:172:\t\tep_sts = cdnsp_w_index_to_ep_index(le16_to_cpu(ctrl-\u003ewIndex));\ndrivers/usb/cdns3/cdnsp-ep0.c-173-\t\tpep = \u0026pdev-\u003eeps[ep_sts];\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-189-\ndrivers/usb/cdns3/cdnsp-ep0.c:190:\treturn cdnsp_ep_enqueue(pdev-\u003eep0_preq.pep, \u0026pdev-\u003eep0_preq);\ndrivers/usb/cdns3/cdnsp-ep0.c-191-}\ndrivers/usb/cdns3/cdnsp-ep0.c-192-\ndrivers/usb/cdns3/cdnsp-ep0.c:193:static void cdnsp_enter_test_mode(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-ep0.c-194-{\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-201-\ndrivers/usb/cdns3/cdnsp-ep0.c:202:static int cdnsp_ep0_handle_feature_device(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-203-\t\t\t\t\t   struct usb_ctrlrequest *ctrl,\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-215-\t\tpdev-\u003emay_wakeup = !!set;\ndrivers/usb/cdns3/cdnsp-ep0.c:216:\t\ttrace_cdnsp_may_wakeup(set);\ndrivers/usb/cdns3/cdnsp-ep0.c-217-\t\tbreak;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-222-\t\tpdev-\u003eu1_allowed = !!set;\ndrivers/usb/cdns3/cdnsp-ep0.c:223:\t\ttrace_cdnsp_u1(set);\ndrivers/usb/cdns3/cdnsp-ep0.c-224-\t\tbreak;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-229-\t\tpdev-\u003eu2_allowed = !!set;\ndrivers/usb/cdns3/cdnsp-ep0.c:230:\t\ttrace_cdnsp_u2(set);\ndrivers/usb/cdns3/cdnsp-ep0.c-231-\t\tbreak;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-253-\t\t */\ndrivers/usb/cdns3/cdnsp-ep0.c:254:\t\tcdnsp_enter_test_mode(pdev);\ndrivers/usb/cdns3/cdnsp-ep0.c-255-\t\tbreak;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-262-\ndrivers/usb/cdns3/cdnsp-ep0.c:263:static int cdnsp_ep0_handle_feature_intf(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-264-\t\t\t\t\t struct usb_ctrlrequest *ctrl,\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-274-\tcase USB_INTRF_FUNC_SUSPEND:\ndrivers/usb/cdns3/cdnsp-ep0.c:275:\t\tret = cdnsp_ep0_delegate_req(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-276-\t\tif (ret)\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-296-\ndrivers/usb/cdns3/cdnsp-ep0.c:297:static int cdnsp_ep0_handle_feature_endpoint(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-298-\t\t\t\t\t     struct usb_ctrlrequest *ctrl,\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-300-{\ndrivers/usb/cdns3/cdnsp-ep0.c:301:\tstruct cdnsp_ep *pep;\ndrivers/usb/cdns3/cdnsp-ep0.c-302-\tu16 wValue;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-304-\twValue = le16_to_cpu(ctrl-\u003ewValue);\ndrivers/usb/cdns3/cdnsp-ep0.c:305:\tpep = \u0026pdev-\u003eeps[cdnsp_w_index_to_ep_index(le16_to_cpu(ctrl-\u003ewIndex))];\ndrivers/usb/cdns3/cdnsp-ep0.c-306-\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-310-\t\t\t/* Resets Sequence Number */\ndrivers/usb/cdns3/cdnsp-ep0.c:311:\t\t\tcdnsp_halt_endpoint(pdev, pep, 0);\ndrivers/usb/cdns3/cdnsp-ep0.c:312:\t\t\tcdnsp_halt_endpoint(pdev, pep, 1);\ndrivers/usb/cdns3/cdnsp-ep0.c-313-\t\t\tbreak;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-315-\ndrivers/usb/cdns3/cdnsp-ep0.c:316:\t\treturn cdnsp_halt_endpoint(pdev, pep, set);\ndrivers/usb/cdns3/cdnsp-ep0.c-317-\tdefault:\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-324-\ndrivers/usb/cdns3/cdnsp-ep0.c:325:static int cdnsp_ep0_handle_feature(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-326-\t\t\t\t    struct usb_ctrlrequest *ctrl,\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-330-\tcase USB_RECIP_DEVICE:\ndrivers/usb/cdns3/cdnsp-ep0.c:331:\t\treturn cdnsp_ep0_handle_feature_device(pdev, ctrl, set);\ndrivers/usb/cdns3/cdnsp-ep0.c-332-\tcase USB_RECIP_INTERFACE:\ndrivers/usb/cdns3/cdnsp-ep0.c:333:\t\treturn cdnsp_ep0_handle_feature_intf(pdev, ctrl, set);\ndrivers/usb/cdns3/cdnsp-ep0.c-334-\tcase USB_RECIP_ENDPOINT:\ndrivers/usb/cdns3/cdnsp-ep0.c:335:\t\treturn cdnsp_ep0_handle_feature_endpoint(pdev, ctrl, set);\ndrivers/usb/cdns3/cdnsp-ep0.c-336-\tdefault:\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-340-\ndrivers/usb/cdns3/cdnsp-ep0.c:341:static int cdnsp_ep0_set_sel(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-342-\t\t\t     struct usb_ctrlrequest *ctrl)\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-364-\ndrivers/usb/cdns3/cdnsp-ep0.c:365:\treturn cdnsp_ep_enqueue(pdev-\u003eep0_preq.pep, \u0026pdev-\u003eep0_preq);\ndrivers/usb/cdns3/cdnsp-ep0.c-366-}\ndrivers/usb/cdns3/cdnsp-ep0.c-367-\ndrivers/usb/cdns3/cdnsp-ep0.c:368:static int cdnsp_ep0_set_isoch_delay(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-369-\t\t\t\t     struct usb_ctrlrequest *ctrl)\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-378-\ndrivers/usb/cdns3/cdnsp-ep0.c:379:static int cdnsp_ep0_std_request(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-ep0.c-380-\t\t\t\t struct usb_ctrlrequest *ctrl)\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-385-\tcase USB_REQ_GET_STATUS:\ndrivers/usb/cdns3/cdnsp-ep0.c:386:\t\tret = cdnsp_ep0_handle_status(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-387-\t\tbreak;\ndrivers/usb/cdns3/cdnsp-ep0.c-388-\tcase USB_REQ_CLEAR_FEATURE:\ndrivers/usb/cdns3/cdnsp-ep0.c:389:\t\tret = cdnsp_ep0_handle_feature(pdev, ctrl, 0);\ndrivers/usb/cdns3/cdnsp-ep0.c-390-\t\tbreak;\ndrivers/usb/cdns3/cdnsp-ep0.c-391-\tcase USB_REQ_SET_FEATURE:\ndrivers/usb/cdns3/cdnsp-ep0.c:392:\t\tret = cdnsp_ep0_handle_feature(pdev, ctrl, 1);\ndrivers/usb/cdns3/cdnsp-ep0.c-393-\t\tbreak;\ndrivers/usb/cdns3/cdnsp-ep0.c-394-\tcase USB_REQ_SET_ADDRESS:\ndrivers/usb/cdns3/cdnsp-ep0.c:395:\t\tret = cdnsp_ep0_set_address(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-396-\t\tbreak;\ndrivers/usb/cdns3/cdnsp-ep0.c-397-\tcase USB_REQ_SET_CONFIGURATION:\ndrivers/usb/cdns3/cdnsp-ep0.c:398:\t\tret = cdnsp_ep0_set_config(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-399-\t\tbreak;\ndrivers/usb/cdns3/cdnsp-ep0.c-400-\tcase USB_REQ_SET_SEL:\ndrivers/usb/cdns3/cdnsp-ep0.c:401:\t\tret = cdnsp_ep0_set_sel(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-402-\t\tbreak;\ndrivers/usb/cdns3/cdnsp-ep0.c-403-\tcase USB_REQ_SET_ISOCH_DELAY:\ndrivers/usb/cdns3/cdnsp-ep0.c:404:\t\tret = cdnsp_ep0_set_isoch_delay(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-405-\t\tbreak;\ndrivers/usb/cdns3/cdnsp-ep0.c-406-\tdefault:\ndrivers/usb/cdns3/cdnsp-ep0.c:407:\t\tret = cdnsp_ep0_delegate_req(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-408-\t\tbreak;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-413-\ndrivers/usb/cdns3/cdnsp-ep0.c:414:void cdnsp_setup_analyze(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-ep0.c-415-{\ndrivers/usb/cdns3/cdnsp-ep0.c-416-\tstruct usb_ctrlrequest *ctrl = \u0026pdev-\u003esetup;\ndrivers/usb/cdns3/cdnsp-ep0.c:417:\tstruct cdnsp_ep *pep;\ndrivers/usb/cdns3/cdnsp-ep0.c-418-\tint ret = -EINVAL;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-420-\ndrivers/usb/cdns3/cdnsp-ep0.c:421:\ttrace_cdnsp_ctrl_req(ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-422-\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-435-\t\tif (GET_EP_CTX_STATE(pep-\u003eout_ctx) == EP_STATE_HALTED)\ndrivers/usb/cdns3/cdnsp-ep0.c:436:\t\t\tcdnsp_halt_endpoint(pdev, pep, 0);\ndrivers/usb/cdns3/cdnsp-ep0.c-437-\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-452-\tif (!list_empty(\u0026pdev-\u003eeps[0].pending_list)) {\ndrivers/usb/cdns3/cdnsp-ep0.c:453:\t\tstruct cdnsp_request\t*req;\ndrivers/usb/cdns3/cdnsp-ep0.c-454-\ndrivers/usb/cdns3/cdnsp-ep0.c:455:\t\ttrace_cdnsp_ep0_request(\"Remove previous\");\ndrivers/usb/cdns3/cdnsp-ep0.c-456-\t\treq = next_request(\u0026pdev-\u003eeps[0].pending_list);\ndrivers/usb/cdns3/cdnsp-ep0.c:457:\t\tcdnsp_ep_dequeue(\u0026pdev-\u003eeps[0], req);\ndrivers/usb/cdns3/cdnsp-ep0.c-458-\t}\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-469-\tif ((ctrl-\u003ebRequestType \u0026 USB_TYPE_MASK) == USB_TYPE_STANDARD)\ndrivers/usb/cdns3/cdnsp-ep0.c:470:\t\tret = cdnsp_ep0_std_request(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-471-\telse\ndrivers/usb/cdns3/cdnsp-ep0.c:472:\t\tret = cdnsp_ep0_delegate_req(pdev, ctrl);\ndrivers/usb/cdns3/cdnsp-ep0.c-473-\ndrivers/usb/cdns3/cdnsp-ep0.c-474-\tif (ret == USB_GADGET_DELAYED_STATUS) {\ndrivers/usb/cdns3/cdnsp-ep0.c:475:\t\ttrace_cdnsp_ep0_status_stage(\"delayed\");\ndrivers/usb/cdns3/cdnsp-ep0.c-476-\t\treturn;\n--\ndrivers/usb/cdns3/cdnsp-ep0.c-479-\tif (ret \u003c 0)\ndrivers/usb/cdns3/cdnsp-ep0.c:480:\t\tcdnsp_ep0_stall(pdev);\ndrivers/usb/cdns3/cdnsp-ep0.c-481-\telse if (!len \u0026\u0026 pdev-\u003eep0_stage != CDNSP_STATUS_STAGE)\ndrivers/usb/cdns3/cdnsp-ep0.c:482:\t\tcdnsp_status_stage(pdev);\ndrivers/usb/cdns3/cdnsp-ep0.c-483-}\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-25-#include \"drd.h\"\ndrivers/usb/cdns3/cdnsp-gadget.c:26:#include \"cdnsp-gadget.h\"\ndrivers/usb/cdns3/cdnsp-gadget.c:27:#include \"cdnsp-trace.h\"\ndrivers/usb/cdns3/cdnsp-gadget.c-28-\ndrivers/usb/cdns3/cdnsp-gadget.c:29:unsigned int cdnsp_port_speed(unsigned int port_status)\ndrivers/usb/cdns3/cdnsp-gadget.c-30-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-53- */\ndrivers/usb/cdns3/cdnsp-gadget.c:54:u32 cdnsp_port_state_to_neutral(u32 state)\ndrivers/usb/cdns3/cdnsp-gadget.c-55-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-60-/**\ndrivers/usb/cdns3/cdnsp-gadget.c:61: * cdnsp_find_next_ext_cap - Find the offset of the extended capabilities\ndrivers/usb/cdns3/cdnsp-gadget.c-62- *                           with capability ID id.\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-71- */\ndrivers/usb/cdns3/cdnsp-gadget.c:72:int cdnsp_find_next_ext_cap(void __iomem *base, u32 start, int id)\ndrivers/usb/cdns3/cdnsp-gadget.c-73-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-102-\ndrivers/usb/cdns3/cdnsp-gadget.c:103:void cdnsp_set_link_state(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-gadget.c-104-\t\t\t  __le32 __iomem *port_regs,\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-110-\ttemp = readl(port_regs);\ndrivers/usb/cdns3/cdnsp-gadget.c:111:\ttemp = cdnsp_port_state_to_neutral(temp);\ndrivers/usb/cdns3/cdnsp-gadget.c-112-\ttemp |= PORT_WKCONN_E | PORT_WKDISC_E;\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-120-\ndrivers/usb/cdns3/cdnsp-gadget.c:121:\ttrace_cdnsp_handle_port_status(port_num, readl(port_regs));\ndrivers/usb/cdns3/cdnsp-gadget.c-122-\twritel(temp, port_regs);\ndrivers/usb/cdns3/cdnsp-gadget.c:123:\ttrace_cdnsp_link_state_changed(port_num, readl(port_regs));\ndrivers/usb/cdns3/cdnsp-gadget.c-124-}\ndrivers/usb/cdns3/cdnsp-gadget.c-125-\ndrivers/usb/cdns3/cdnsp-gadget.c:126:static void cdnsp_disable_port(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-gadget.c-127-\t\t\t       __le32 __iomem *port_regs)\ndrivers/usb/cdns3/cdnsp-gadget.c-128-{\ndrivers/usb/cdns3/cdnsp-gadget.c:129:\tu32 temp = cdnsp_port_state_to_neutral(readl(port_regs));\ndrivers/usb/cdns3/cdnsp-gadget.c-130-\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-133-\ndrivers/usb/cdns3/cdnsp-gadget.c:134:static void cdnsp_clear_port_change_bit(struct cdnsp_device *pdev,\ndrivers/usb/cdns3/cdnsp-gadget.c-135-\t\t\t\t\t__le32 __iomem *port_regs)\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-138-\ndrivers/usb/cdns3/cdnsp-gadget.c:139:\twritel(cdnsp_port_state_to_neutral(portsc) |\ndrivers/usb/cdns3/cdnsp-gadget.c-140-\t       (portsc \u0026 PORT_CHANGE_BITS), port_regs);\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-142-\ndrivers/usb/cdns3/cdnsp-gadget.c:143:static void cdnsp_set_apb_timeout_value(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-gadget.c-144-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-154-\tbase = \u0026pdev-\u003ecap_regs-\u003ehc_capbase;\ndrivers/usb/cdns3/cdnsp-gadget.c:155:\toffset = cdnsp_find_next_ext_cap(base, offset, D_XEC_PRE_REGS_CAP);\ndrivers/usb/cdns3/cdnsp-gadget.c-156-\treg = base + offset + REG_CHICKEN_BITS_3_OFFSET;\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-162-\ndrivers/usb/cdns3/cdnsp-gadget.c:163:static void cdnsp_set_chicken_bits_2(struct cdnsp_device *pdev, u32 bit)\ndrivers/usb/cdns3/cdnsp-gadget.c-164-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-169-\tbase = \u0026pdev-\u003ecap_regs-\u003ehc_capbase;\ndrivers/usb/cdns3/cdnsp-gadget.c:170:\toffset = cdnsp_find_next_ext_cap(base, offset, D_XEC_PRE_REGS_CAP);\ndrivers/usb/cdns3/cdnsp-gadget.c-171-\treg = base + offset + REG_CHICKEN_BITS_2_OFFSET;\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-176-\ndrivers/usb/cdns3/cdnsp-gadget.c:177:static void cdnsp_clear_chicken_bits_2(struct cdnsp_device *pdev, u32 bit)\ndrivers/usb/cdns3/cdnsp-gadget.c-178-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-183-\tbase = \u0026pdev-\u003ecap_regs-\u003ehc_capbase;\ndrivers/usb/cdns3/cdnsp-gadget.c:184:\toffset = cdnsp_find_next_ext_cap(base, offset, D_XEC_PRE_REGS_CAP);\ndrivers/usb/cdns3/cdnsp-gadget.c-185-\treg = base + offset + REG_CHICKEN_BITS_2_OFFSET;\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-193- */\ndrivers/usb/cdns3/cdnsp-gadget.c:194:static void cdnsp_quiesce(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-gadget.c-195-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-219- */\ndrivers/usb/cdns3/cdnsp-gadget.c:220:int cdnsp_halt(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-gadget.c-221-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-224-\ndrivers/usb/cdns3/cdnsp-gadget.c:225:\tcdnsp_quiesce(pdev);\ndrivers/usb/cdns3/cdnsp-gadget.c-226-\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-234-\ndrivers/usb/cdns3/cdnsp-gadget.c:235:\tpdev-\u003ecdnsp_state |= CDNSP_STATE_HALTED;\ndrivers/usb/cdns3/cdnsp-gadget.c-236-\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-243- */\ndrivers/usb/cdns3/cdnsp-gadget.c:244:void cdnsp_died(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-gadget.c-245-{\ndrivers/usb/cdns3/cdnsp-gadget.c-246-\tdev_err(pdev-\u003edev, \"ERROR: CDNSP controller not responding\\n\");\ndrivers/usb/cdns3/cdnsp-gadget.c:247:\tpdev-\u003ecdnsp_state |= CDNSP_STATE_DYING;\ndrivers/usb/cdns3/cdnsp-gadget.c:248:\tcdnsp_halt(pdev);\ndrivers/usb/cdns3/cdnsp-gadget.c-249-}\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-253- */\ndrivers/usb/cdns3/cdnsp-gadget.c:254:static int cdnsp_start(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-gadget.c-255-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-262-\ndrivers/usb/cdns3/cdnsp-gadget.c:263:\tpdev-\u003ecdnsp_state = 0;\ndrivers/usb/cdns3/cdnsp-gadget.c-264-\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-272-\tif (ret) {\ndrivers/usb/cdns3/cdnsp-gadget.c:273:\t\tpdev-\u003ecdnsp_state = CDNSP_STATE_DYING;\ndrivers/usb/cdns3/cdnsp-gadget.c-274-\t\tdev_err(pdev-\u003edev, \"ERROR: Controller run failed\\n\");\n\n"
}

gemini-3.8-flash

null

null

							input: 19947
							output: 37
							thoughts: 16
						

Here's a summary of my thought process, as if I were analyzing that Kconfig file:

**Diving into the CDNS3 USB Driver Configuration**

Okay, time to dissect `drivers/usb/cdns3/Kconfig`. I know this driver – it's the Cadence Design Systems USB 3.0 controller driver. I need to understand its configuration options, what features are exposed, and how they relate to the overall USB subsystem.

My immediate focus is on the `Kconfig` file because it defines the build-time configuration parameters. I'm looking for the dependencies – what other drivers or kernel features is this one contingent upon? Are there specific hardware features I need to consider? What's the granularity of control? Are there options for power management, specific USB modes, or debugging features?

I'm particularly interested in seeing how they've handled various controller revisions or potential custom silicon integrations. Are there Vendor IDs, Product IDs, and Device IDs defined, or is it more generic? Are there specific clock settings or PHY configuration options exposed for tuning performance?

I'll be looking for comments within the `Kconfig` file. I'll need those to understand the rationale behind the various options and how they were intended to be used. I’ll want to see if the configuration is well-structured, easy to understand, and maintainable. This also informs my knowledge of the maintainers' intentions.

Essentially, I'm trying to build a mental map of this driver's configuration space. This will tell me everything I need to know about integrating the driver into a new system, debugging it, or tuning its performance.

{
  "File": "drivers/usb/cdns3/Kconfig",
  "FirstLine": 1,
  "LineCount": 105
}

{
  "Contents": "   1:\tconfig USB_CDNS_SUPPORT\n   2:\t\ttristate \"Cadence USB Support\"\n   3:\t\tdepends on USB_SUPPORT \u0026\u0026 (USB || USB_GADGET) \u0026\u0026 HAS_DMA\n   4:\t\tselect USB_XHCI_PLATFORM if USB_XHCI_HCD\n   5:\t\tselect USB_ROLE_SWITCH\n   6:\t\thelp\n   7:\t\t  Say Y here if your system has a Cadence USBSS or USBSSP\n   8:\t\t  dual-role controller.\n   9:\t\t  It supports: dual-role switch, Host-only, and Peripheral-only.\n  10:\t\n  11:\tconfig USB_CDNS_HOST\n  12:\t\tbool\n  13:\t\n  14:\tif USB_CDNS_SUPPORT\n  15:\t\n  16:\tconfig USB_CDNS3\n  17:\t\ttristate \"Cadence USB3 Dual-Role Controller\"\n  18:\t\tdepends on USB_CDNS_SUPPORT\n  19:\t\thelp\n  20:\t\t  Say Y here if your system has a Cadence USB3 dual-role controller.\n  21:\t\t  It supports: dual-role switch, Host-only, and Peripheral-only.\n  22:\t\n  23:\t\t  If you choose to build this driver is a dynamically linked\n  24:\t\t  as module, the module will be called cdns3.ko.\n  25:\tendif\n  26:\t\n  27:\tif USB_CDNS3\n  28:\t\n  29:\tconfig USB_CDNS3_GADGET\n  30:\t\tbool \"Cadence USB3 device controller\"\n  31:\t\tdepends on USB_GADGET=y || USB_GADGET=USB_CDNS3\n  32:\t\thelp\n  33:\t\t  Say Y here to enable device controller functionality of the\n  34:\t\t  Cadence USBSS-DEV driver.\n  35:\t\n  36:\t\t  This controller supports FF, HS and SS mode. It doesn't support\n  37:\t\t  LS and SSP mode.\n  38:\t\n  39:\tconfig USB_CDNS3_HOST\n  40:\t\tbool \"Cadence USB3 host controller\"\n  41:\t\tdepends on USB=y || USB=USB_CDNS3\n  42:\t\tselect USB_CDNS_HOST\n  43:\t\thelp\n  44:\t\t  Say Y here to enable host controller functionality of the\n  45:\t\t  Cadence driver.\n  46:\t\n  47:\t\t  Host controller is compliant with XHCI so it will use\n  48:\t\t  standard XHCI driver.\n  49:\t\n  50:\tconfig USB_CDNS3_PCI_WRAP\n  51:\t\ttristate \"Cadence USB3 support on PCIe-based platforms\"\n  52:\t\tdepends on USB_PCI \u0026\u0026 ACPI\n  53:\t\tdefault USB_CDNS3\n  54:\t\thelp\n  55:\t\t  If you're using the USBSS Core IP with a PCIe, please say\n  56:\t\t  'Y' or 'M' here.\n  57:\t\n  58:\t\t  If you choose to build this driver as module it will\n  59:\t\t  be dynamically linked and module will be called cdns3-pci.ko\n  60:\t\n  61:\tconfig USB_CDNS3_TI\n  62:\t\ttristate \"Cadence USB3 support on TI platforms\"\n  63:\t\tdepends on ARCH_K3 || COMPILE_TEST\n  64:\t\tdefault USB_CDNS3\n  65:\t\thelp\n  66:\t\t  Say 'Y' or 'M' here if you are building for Texas Instruments\n  67:\t\t  platforms that contain Cadence USB3 controller core.\n  68:\t\n  69:\t\t  e.g. J721e.\n  70:\t\n  71:\tconfig USB_CDNS3_IMX\n  72:\t\ttristate \"Cadence USB3 support on NXP i.MX platforms\"\n  73:\t\tdepends on ARCH_MXC || COMPILE_TEST\n  74:\t\tdefault USB_CDNS3\n  75:\t\thelp\n  76:\t\t  Say 'Y' or 'M' here if you are building for NXP i.MX\n  77:\t\t  platforms that contain Cadence USB3 controller core.\n  78:\t\n  79:\t\t  For example, imx8qm and imx8qxp.\n  80:\t\n  81:\tconfig USB_CDNS3_STARFIVE\n  82:\t\ttristate \"Cadence USB3 support on StarFive SoC platforms\"\n  83:\t\tdepends on ARCH_STARFIVE || COMPILE_TEST\n  84:\t\thelp\n  85:\t\t  Say 'Y' or 'M' here if you are building for StarFive SoCs\n  86:\t\t  platforms that contain Cadence USB3 controller core.\n  87:\t\n  88:\t\t  e.g. JH7110.\n  89:\t\n  90:\t\t  If you choose to build this driver as module it will\n  91:\t\t  be dynamically linked and module will be called cdns3-starfive.ko\n  92:\tendif\n  93:\t\n  94:\tif USB_CDNS_SUPPORT\n  95:\t\n  96:\tconfig USB_CDNSP_PCI\n  97:\t\ttristate \"Cadence CDNSP Dual-Role Controller\"\n  98:\t\tdepends on USB_CDNS_SUPPORT \u0026\u0026 USB_PCI \u0026\u0026 ACPI\n  99:\t\thelp\n 100:\t\t  Say Y here if your system has a Cadence CDNSP dual-role controller.\n"
}

gemini-3.8-flash

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							input: 21745
							output: 38
							thoughts: 19
						

Here's my take on the `drivers/usb/cdns3/Kconfig` file.

**Diving into the CDNS3 Kconfig File**

Okay, time to take a look at the rest of this `Kconfig` file. I'm expecting to see the usual structure for a driver configuration: dependencies, option descriptions, and the default settings. Given this is the CDNS3 USB driver, I'm anticipating configurations for different CDNS3 controller revisions, various power management options, perhaps DMA configurations, and potentially features specific to the host or device roles. I'll be looking to see how these options are grouped and organized logically – are they categorized by function, hardware revision, or something else? I'm curious if they've used any clever tricks with `select` or `depends on` statements to simplify the user's choices. The presence of help text is always something I'll quickly scan over, as clear documentation is a must. Really, I'm assessing the maintainability and usability of the configuration process. Ultimately, I'm expecting a clean, well-defined way to configure this CDNS3 driver for a specific hardware configuration and use case. I'm hoping I don't see any glaring omissions or inconsistencies that would make integrating this into a larger system a headache. Let's see what we've got.

{
  "File": "drivers/usb/cdns3/Kconfig",
  "FirstLine": 100,
  "LineCount": 40
}

{
  "Contents": " 100:\t\t  Say Y here if your system has a Cadence CDNSP dual-role controller.\n 101:\t\t  It supports: dual-role switch Host-only, and Peripheral-only.\n 102:\t\n 103:\t\t  If you choose to build this driver is a dynamically linked\n 104:\t\t  module, the module will be called cdnsp.ko.\n 105:\tendif\n 106:\t\n 107:\tif USB_CDNSP_PCI\n 108:\t\n 109:\tconfig USB_CDNSP_GADGET\n 110:\t\tbool \"Cadence CDNSP device controller\"\n 111:\t\tdepends on USB_GADGET=y || USB_GADGET=USB_CDNSP_PCI\n 112:\t\thelp\n 113:\t\t  Say Y here to enable device controller functionality of the\n 114:\t\t  Cadence CDNSP-DEV driver.\n 115:\t\n 116:\t\t  Cadence CDNSP Device Controller in device mode is\n 117:\t\t  very similar to XHCI controller. Therefore some algorithms\n 118:\t\t  used has been taken from host driver.\n 119:\t\t  This controller supports FF, HS, SS and SSP mode.\n 120:\t\t  It doesn't support LS.\n 121:\t\n 122:\tconfig USB_CDNSP_HOST\n 123:\t\tbool \"Cadence CDNSP host controller\"\n 124:\t\tdepends on USB=y || USB=USB_CDNSP_PCI\n 125:\t\tselect USB_CDNS_HOST\n 126:\t\thelp\n 127:\t\t  Say Y here to enable host controller functionality of the\n 128:\t\t  Cadence driver.\n 129:\t\n 130:\t\t  Host controller is compliant with XHCI so it uses\n 131:\t\t  standard XHCI driver.\n 132:\t\n 133:\tendif\n"
}

gemini-3.8-flash

null

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							input: 22590
							output: 31
							thoughts: 43
						

**Analyzing CDNSP Drivers**

Okay, let's dive into this. My initial thought is to examine the `USB_CDNSP_PCI` and `USB_CDNSP_GADGET` modules. I need to understand how these drivers interact. I'm specifically trying to figure out which probes are triggering the `cdnsp` driver. 

Aha! Let's zero in on `cdnsp-pci.c`. I have a feeling that file will hold the key to understanding this probing behavior. Time to dissect that code and see what we can learn about how these components are initialized.

{
  "Expression": "pci_driver",
  "PathPrefix": "drivers/usb/cdns3"
}

{
  "Output": "drivers/usb/cdns3/cdns3-pci-wrap.c=186=static const struct pci_device_id cdns3_pci_ids[] = {\n--\ndrivers/usb/cdns3/cdns3-pci-wrap.c-190-\ndrivers/usb/cdns3/cdns3-pci-wrap.c:191:static struct pci_driver cdns3_pci_driver = {\ndrivers/usb/cdns3/cdns3-pci-wrap.c-192-\t.name = PCI_DRIVER_NAME,\n--\ndrivers/usb/cdns3/cdns3-pci-wrap.c-197-\ndrivers/usb/cdns3/cdns3-pci-wrap.c:198:module_pci_driver(cdns3_pci_driver);\ndrivers/usb/cdns3/cdns3-pci-wrap.c-199-MODULE_DEVICE_TABLE(pci, cdns3_pci_ids);\n--\ndrivers/usb/cdns3/cdnsp-pci.c=222=static const struct pci_device_id cdnsp_pci_ids[] = {\n--\ndrivers/usb/cdns3/cdnsp-pci.c-231-\ndrivers/usb/cdns3/cdnsp-pci.c:232:static struct pci_driver cdnsp_pci_driver = {\ndrivers/usb/cdns3/cdnsp-pci.c-233-\t.name = \"cdnsp-pci\",\n--\ndrivers/usb/cdns3/cdnsp-pci.c-241-\ndrivers/usb/cdns3/cdnsp-pci.c:242:module_pci_driver(cdnsp_pci_driver);\ndrivers/usb/cdns3/cdnsp-pci.c-243-MODULE_DEVICE_TABLE(pci, cdnsp_pci_ids);\n"
}

gemini-3.8-flash

null

null

							input: 23287
							output: 43
							thoughts: 31
						

Okay, here's my interpretation of what's going on in that code snippet, as if it were my own thought process:

**Diving into the CDNS3 PCI Driver**

Alright, I'm taking a look at `drivers/usb/cdns3/cdnsp-pci.c`, specifically lines 220-245. I know this section is likely dealing with the PCI-specific aspects of the Cadence USB3 host controller. So, here's what I'm piecing together:

I bet this code is probably focusing on probing and initializing the PCI device. I'm assuming it's handling the usual suspects: checking the PCI device ID to make sure it's *actually* a CDNS3 controller, mapping the PCI configuration space to memory so that I can read its registers and get it going, maybe setting up the interrupt lines and figuring out how the device is going to signal me when it has something to report.

I'd expect there to be some initial resource allocation. Probably asking for an interrupt request, grabbing some PCI memory regions for the host controller's internal registers and possibly DMA buffers. I also wouldn't be surprised to see a check on whether this particular CDNS3 device is supported on this given board.

Then, there'll be some register writes - some of the basic register configuration of the CDNS3. This would set up things like clock settings, reset the hardware, or set up the basic controller mode (like whether it's operating as a host or as a device). There's going to be a lot of bit-fiddling with the PCI config registers, ensuring the PCI device itself is set up correctly (e.g. enabling bus mastering, maybe setting up the BARs).

It's likely that a structure `cdns3_pci` is defined, and that is going to hold all the important bits for this particular controller - the base address, IRQ number, PCI device pointer, and so on. So probably, a pointer to this is setup here.

I hope I don't run into any obvious PCI quirks or incompatibilities! Let's get to the code and see exactly what's happening.

{
  "File": "drivers/usb/cdns3/cdnsp-pci.c",
  "FirstLine": 210,
  "LineCount": 35
}

{
  "Contents": " 210:\t\tspin_lock_irqsave(\u0026cdns-\u003elock, flags);\n 211:\t\tret = cdns_resume(cdns);\n 212:\t\tspin_unlock_irqrestore(\u0026cdns-\u003elock, flags);\n 213:\t\tcdns_set_active(cdns, 1);\n 214:\t\n 215:\t\treturn ret;\n 216:\t}\n 217:\t\n 218:\tstatic const struct dev_pm_ops cdnsp_pci_pm_ops = {\n 219:\t\tSET_SYSTEM_SLEEP_PM_OPS(cdnsp_pci_suspend, cdnsp_pci_resume)\n 220:\t};\n 221:\t\n 222:\tstatic const struct pci_device_id cdnsp_pci_ids[] = {\n 223:\t\t{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USBSSP),\n 224:\t\t  .class = PCI_CLASS_SERIAL_USB_DEVICE },\n 225:\t\t{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USBSSP),\n 226:\t\t  .class = PCI_CLASS_SERIAL_USB_CDNS },\n 227:\t\t{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USBSS),\n 228:\t\t  .class = PCI_CLASS_SERIAL_USB_CDNS },\n 229:\t\t{ 0, }\n 230:\t};\n 231:\t\n 232:\tstatic struct pci_driver cdnsp_pci_driver = {\n 233:\t\t.name = \"cdnsp-pci\",\n 234:\t\t.id_table = cdnsp_pci_ids,\n 235:\t\t.probe = cdnsp_pci_probe,\n 236:\t\t.remove = cdnsp_pci_remove,\n 237:\t\t.driver = {\n 238:\t\t\t.pm = \u0026cdnsp_pci_pm_ops,\n 239:\t\t}\n 240:\t};\n 241:\t\n 242:\tmodule_pci_driver(cdnsp_pci_driver);\n 243:\tMODULE_DEVICE_TABLE(pci, cdnsp_pci_ids);\n 244:\t\n"
}

gemini-3.8-flash

null

null

							input: 24455
							output: 21
							thoughts: 72
						

**Investigating the Scope of `cdnsp-pci`**

Okay, hold on a second. I need to clarify something crucial here. The name `cdnsp-pci`... is it *exclusively* for Cadence PCI devices? I need to be absolutely certain of the scope of this module. A misinterpretation here could lead to some nasty debugging later.

Right, so let's get down to brass tacks. I need to meticulously verify this. My immediate next step is to perform a thorough cross-reference. I'm going to search the entire codebase. Specifically, I'll be looking for any other instances where `cdnsp_gadget_init`, `__cdnsp_gadget_init`, or even just plain old `cdnsp` are being called or being associated with platform devices. I need to see *everything* that touches this core functionality. Let's start with a `grep` for `cdnsp_gadget_init`. That should give me a solid starting point.

{
  "Expression": "cdnsp_gadget_init"
}

{
  "Output": "drivers/usb/cdns3/cdnsp-gadget.c=1607=static void cdnsp_get_ep_buffering(struct cdnsp_device *pdev,\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-1633-\ndrivers/usb/cdns3/cdnsp-gadget.c:1634:static int cdnsp_gadget_init_endpoints(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-gadget.c-1635-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c=1823=static int cdnsp_gen_setup(struct cdnsp_device *pdev)\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-1899-\ndrivers/usb/cdns3/cdnsp-gadget.c:1900:static int __cdnsp_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/cdnsp-gadget.c-1901-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-1956-\ndrivers/usb/cdns3/cdnsp-gadget.c:1957:\tret = cdnsp_gadget_init_endpoints(pdev);\ndrivers/usb/cdns3/cdnsp-gadget.c-1958-\tif (ret) {\n--\ndrivers/usb/cdns3/cdnsp-gadget.c=2029=static int cdnsp_gadget_resume(struct cdns *cdns, bool lost_power)\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-2055-/**\ndrivers/usb/cdns3/cdnsp-gadget.c:2056: * cdnsp_gadget_init - initialize device structure\ndrivers/usb/cdns3/cdnsp-gadget.c-2057- * @cdns: cdnsp instance\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-2060- */\ndrivers/usb/cdns3/cdnsp-gadget.c:2061:int cdnsp_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/cdnsp-gadget.c-2062-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-2068-\ndrivers/usb/cdns3/cdnsp-gadget.c:2069:\trdrv-\u003estart\t= __cdnsp_gadget_init;\ndrivers/usb/cdns3/cdnsp-gadget.c-2070-\trdrv-\u003estop\t= cdnsp_gadget_exit;\n--\ndrivers/usb/cdns3/cdnsp-pci.c=48=static int cdnsp_pci_probe(struct pci_dev *pdev,\n--\ndrivers/usb/cdns3/cdnsp-pci.c-153-\t\tcdnsp-\u003edev = dev;\ndrivers/usb/cdns3/cdnsp-pci.c:154:\t\tcdnsp-\u003egadget_init = cdnsp_gadget_init;\ndrivers/usb/cdns3/cdnsp-pci.c-155-\n--\ndrivers/usb/cdns3/gadget-export.h-14-\ndrivers/usb/cdns3/gadget-export.h:15:int cdnsp_gadget_init(struct cdns *cdns);\ndrivers/usb/cdns3/gadget-export.h-16-#else\ndrivers/usb/cdns3/gadget-export.h-17-\ndrivers/usb/cdns3/gadget-export.h:18:static inline int cdnsp_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/gadget-export.h-19-{\n"
}

gemini-3.8-flash

null

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							input: 25740
							output: 42
							thoughts: 106
						

**Investigating the `cdnsp_gadget_init` Function**

Okay, so the code indicates that `cdnsp_gadget_init` is *only* called by `cdnsp-pci.c`. Interesting. I need to be absolutely certain though, so I'll double-check that by looking at all callers and drivers related to cdns3. Let's see... specifically, `cdnsp-pci.c` does seem to assign `cdnsp_gadget_init` to `cdnsp->gadget_init`. Now, I should dive into `drivers/usb/cdns3/cdnsp-pci.c` to see what `cdnsp_pci_probe` is all about – that's where the connection happens, right? I need to understand the full picture here.

{
  "File": "drivers/usb/cdns3/cdnsp-pci.c",
  "FirstLine": 48,
  "LineCount": 80
}

{
  "Contents": "  48:\tstatic int cdnsp_pci_probe(struct pci_dev *pdev,\n  49:\t\t\t\t   const struct pci_device_id *id)\n  50:\t{\n  51:\t\tstruct device *dev = \u0026pdev-\u003edev;\n  52:\t\tstruct pci_dev *func;\n  53:\t\tstruct resource *res;\n  54:\t\tstruct cdns *cdnsp;\n  55:\t\tint ret;\n  56:\t\n  57:\t\t/*\n  58:\t\t * For GADGET/HOST PCI (devfn) function number is 0,\n  59:\t\t * for OTG PCI (devfn) function number is 1.\n  60:\t\t */\n  61:\t\tif (!id || (pdev-\u003edevfn != PCI_DEV_FN_HOST_DEVICE \u0026\u0026\n  62:\t\t\t    pdev-\u003edevfn != PCI_DEV_FN_OTG))\n  63:\t\t\treturn -EINVAL;\n  64:\t\n  65:\t\tfunc = cdnsp_get_second_fun(pdev);\n  66:\t\tif (!func)\n  67:\t\t\treturn -EINVAL;\n  68:\t\n  69:\t\tif (func-\u003eclass == PCI_CLASS_SERIAL_USB_XHCI ||\n  70:\t\t    pdev-\u003eclass == PCI_CLASS_SERIAL_USB_XHCI) {\n  71:\t\t\tret = -EINVAL;\n  72:\t\t\tgoto put_pci;\n  73:\t\t}\n  74:\t\n  75:\t\tret = pcim_enable_device(pdev);\n  76:\t\tif (ret) {\n  77:\t\t\tdev_err(\u0026pdev-\u003edev, \"Enabling PCI device has failed %d\\n\", ret);\n  78:\t\t\tgoto put_pci;\n  79:\t\t}\n  80:\t\n  81:\t\tpci_set_master(pdev);\n  82:\t\tif (pci_is_enabled(func)) {\n  83:\t\t\tcdnsp = pci_get_drvdata(func);\n  84:\t\t} else {\n  85:\t\t\tcdnsp = kzalloc_obj(*cdnsp);\n  86:\t\t\tif (!cdnsp) {\n  87:\t\t\t\tret = -ENOMEM;\n  88:\t\t\t\tgoto put_pci;\n  89:\t\t\t}\n  90:\t\t}\n  91:\t\n  92:\t\t/* For GADGET device function number is 0. */\n  93:\t\tif (pdev-\u003edevfn == 0) {\n  94:\t\t\tresource_size_t rsrc_start, rsrc_len;\n  95:\t\n  96:\t\t\t/* Function 0: host(BAR_0) + device(BAR_1).*/\n  97:\t\t\tdev_dbg(dev, \"Initialize resources\\n\");\n  98:\t\t\trsrc_start = pci_resource_start(pdev, PCI_BAR_DEV);\n  99:\t\t\trsrc_len = pci_resource_len(pdev, PCI_BAR_DEV);\n 100:\t\t\tres = devm_request_mem_region(dev, rsrc_start, rsrc_len, \"dev\");\n 101:\t\t\tif (!res) {\n 102:\t\t\t\tdev_dbg(dev, \"controller already in use\\n\");\n 103:\t\t\t\tret = -EBUSY;\n 104:\t\t\t\tgoto free_cdnsp;\n 105:\t\t\t}\n 106:\t\n 107:\t\t\tcdnsp-\u003edev_regs = devm_ioremap(dev, rsrc_start, rsrc_len);\n 108:\t\t\tif (!cdnsp-\u003edev_regs) {\n 109:\t\t\t\tdev_dbg(dev, \"error mapping memory\\n\");\n 110:\t\t\t\tret = -EFAULT;\n 111:\t\t\t\tgoto free_cdnsp;\n 112:\t\t\t}\n 113:\t\n 114:\t\t\tcdnsp-\u003edev_irq = pdev-\u003eirq;\n 115:\t\t\tdev_dbg(dev, \"USBSS-DEV physical base addr: %pa\\n\",\n 116:\t\t\t\t\u0026rsrc_start);\n 117:\t\n 118:\t\t\tres = \u0026cdnsp-\u003exhci_res[0];\n 119:\t\t\tres-\u003estart = pci_resource_start(pdev, PCI_BAR_HOST);\n 120:\t\t\tres-\u003eend = pci_resource_end(pdev, PCI_BAR_HOST);\n 121:\t\t\tres-\u003ename = \"xhci\";\n 122:\t\t\tres-\u003eflags = IORESOURCE_MEM;\n 123:\t\t\tdev_dbg(dev, \"USBSS-XHCI physical base addr: %pa\\n\",\n 124:\t\t\t\t\u0026res-\u003estart);\n 125:\t\n 126:\t\t\t/* Interrupt for XHCI, */\n 127:\t\t\tres = \u0026cdnsp-\u003exhci_res[1];\n"
}

gemini-3.8-flash

null

null

							input: 27309
							output: 43
							thoughts: 16
						

Okay, here's my interpretation of that thought process, assuming I'm deep in the weeds of kernel development and specifically working with PCI drivers:

**Diving Deeper into cdnsp_pci_probe**

Alright, so we're looking at `cdnsp_pci_probe`. The name alone tells me this is likely the probe function for a PCI device driver, and it's probably related to some kind of CDNSP (I'll need to remember what that abbreviation stands for in this context; likely some kind of network interface or storage controller). The fact that I'm thinking, "Let's see the rest of `cdnsp_pci_probe`" tells me that I've probably already started looking at the file and have a basic understanding of *what* it is, maybe just the function signature, or maybe have browsed through a few lines. I'm now at the point where I need to understand *how* the function works. I need to get a holistic view of the implementation and all its conditional branches. I'm ready to dig into the details and find out exactly what this probe function does. I'm ready to see the code's control flow, how it initializes the device, how it handles resource allocation, and any potential error conditions that might crop up. This is where the real work begins. Let's get to it.

{
  "File": "drivers/usb/cdns3/cdnsp-pci.c",
  "FirstLine": 128,
  "LineCount": 55
}

{
  "Contents": " 128:\t\t\tres-\u003estart = pdev-\u003eirq;\n 129:\t\t\tres-\u003ename = \"host\";\n 130:\t\t\tres-\u003eflags = IORESOURCE_IRQ;\n 131:\t\t} else {\n 132:\t\t\tres = \u0026cdnsp-\u003eotg_res;\n 133:\t\t\tres-\u003estart = pci_resource_start(pdev, PCI_BAR_OTG);\n 134:\t\t\tres-\u003eend =   pci_resource_end(pdev, PCI_BAR_OTG);\n 135:\t\t\tres-\u003ename = \"otg\";\n 136:\t\t\tres-\u003eflags = IORESOURCE_MEM;\n 137:\t\t\tdev_dbg(dev, \"CDNSP-DRD physical base addr: %pa\\n\",\n 138:\t\t\t\t\u0026res-\u003estart);\n 139:\t\n 140:\t\t\t/* Interrupt for OTG/DRD. */\n 141:\t\t\tcdnsp-\u003eotg_irq = pdev-\u003eirq;\n 142:\t\t}\n 143:\t\n 144:\t\t/*\n 145:\t\t * Cadence PCI based platform require some longer timeout for APB\n 146:\t\t * to fixes domain clock synchronization issue after resuming\n 147:\t\t * controller from L1 state.\n 148:\t\t */\n 149:\t\tcdnsp-\u003eoverride_apb_timeout = CHICKEN_APB_TIMEOUT_VALUE;\n 150:\t\tpci_set_drvdata(pdev, cdnsp);\n 151:\t\n 152:\t\tif (pci_is_enabled(func)) {\n 153:\t\t\tcdnsp-\u003edev = dev;\n 154:\t\t\tcdnsp-\u003egadget_init = cdnsp_gadget_init;\n 155:\t\n 156:\t\t\tret = cdns_init(cdnsp);\n 157:\t\t\tif (ret)\n 158:\t\t\t\tgoto free_cdnsp;\n 159:\t\t}\n 160:\t\n 161:\t\tdevice_wakeup_enable(\u0026pdev-\u003edev);\n 162:\t\tif (pci_dev_run_wake(pdev))\n 163:\t\t\tpm_runtime_put_noidle(\u0026pdev-\u003edev);\n 164:\t\n 165:\t\treturn 0;\n 166:\t\n 167:\tfree_cdnsp:\n 168:\t\tif (!pci_is_enabled(func))\n 169:\t\t\tkfree(cdnsp);\n 170:\t\n 171:\tput_pci:\n 172:\t\tpci_dev_put(func);\n 173:\t\n 174:\t\treturn ret;\n 175:\t}\n 176:\t\n 177:\tstatic void cdnsp_pci_remove(struct pci_dev *pdev)\n 178:\t{\n 179:\t\tstruct cdns *cdnsp;\n 180:\t\tstruct pci_dev *func;\n 181:\t\n 182:\t\tfunc = cdnsp_get_second_fun(pdev);\n"
}

gemini-3.8-flash

null

null

							input: 28469
							output: 31
							thoughts: 58
						

Okay, here's my thought process as I'd articulate it:

**Digging into CDNSP vs. CDNS3**

Right, time to get to the bottom of this. I need to compare `cdns3` against `cdnsp`. But before I dive into the code, I need to make sure I understand the scope of `cdnsp`. I better check if that name, `cdnsp`, is actually used anywhere else in the project. Gotta be systematic. So, let's start by looking specifically at either `drivers/usb/cdns3/core.c` or any other files in `drivers/usb/cdns3`. That seems like a logical place to start digging.

{
  "Expression": "gadget_init",
  "PathPrefix": "drivers/usb/cdns3"
}

{
  "Output": "drivers/usb/cdns3/cdns3-gadget.c=3297=static int cdns3_gadget_start(struct cdns *cdns)\n--\ndrivers/usb/cdns3/cdns3-gadget.c-3426-\ndrivers/usb/cdns3/cdns3-gadget.c:3427:static int __cdns3_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/cdns3-gadget.c-3428-{\n--\ndrivers/usb/cdns3/cdns3-gadget.c=3486=static int cdns3_gadget_resume(struct cdns *cdns, bool lost_power)\n--\ndrivers/usb/cdns3/cdns3-gadget.c-3500-/**\ndrivers/usb/cdns3/cdns3-gadget.c:3501: * cdns3_gadget_init - initialize device structure\ndrivers/usb/cdns3/cdns3-gadget.c-3502- *\n--\ndrivers/usb/cdns3/cdns3-gadget.c-3506- */\ndrivers/usb/cdns3/cdns3-gadget.c:3507:int cdns3_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/cdns3-gadget.c-3508-{\n--\ndrivers/usb/cdns3/cdns3-gadget.c-3514-\ndrivers/usb/cdns3/cdns3-gadget.c:3515:\trdrv-\u003estart\t= __cdns3_gadget_init;\ndrivers/usb/cdns3/cdns3-gadget.c-3516-\trdrv-\u003estop\t= cdns3_gadget_exit;\n--\ndrivers/usb/cdns3/cdns3-plat.c=53=static int cdns3_plat_probe(struct platform_device *pdev)\n--\ndrivers/usb/cdns3/cdns3-plat.c-145-\ndrivers/usb/cdns3/cdns3-plat.c:146:\tcdns-\u003egadget_init = cdns3_gadget_init;\ndrivers/usb/cdns3/cdns3-plat.c-147-\n--\ndrivers/usb/cdns3/cdnsp-gadget.c=1607=static void cdnsp_get_ep_buffering(struct cdnsp_device *pdev,\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-1633-\ndrivers/usb/cdns3/cdnsp-gadget.c:1634:static int cdnsp_gadget_init_endpoints(struct cdnsp_device *pdev)\ndrivers/usb/cdns3/cdnsp-gadget.c-1635-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c=1823=static int cdnsp_gen_setup(struct cdnsp_device *pdev)\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-1899-\ndrivers/usb/cdns3/cdnsp-gadget.c:1900:static int __cdnsp_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/cdnsp-gadget.c-1901-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-1956-\ndrivers/usb/cdns3/cdnsp-gadget.c:1957:\tret = cdnsp_gadget_init_endpoints(pdev);\ndrivers/usb/cdns3/cdnsp-gadget.c-1958-\tif (ret) {\n--\ndrivers/usb/cdns3/cdnsp-gadget.c=2029=static int cdnsp_gadget_resume(struct cdns *cdns, bool lost_power)\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-2055-/**\ndrivers/usb/cdns3/cdnsp-gadget.c:2056: * cdnsp_gadget_init - initialize device structure\ndrivers/usb/cdns3/cdnsp-gadget.c-2057- * @cdns: cdnsp instance\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-2060- */\ndrivers/usb/cdns3/cdnsp-gadget.c:2061:int cdnsp_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/cdnsp-gadget.c-2062-{\n--\ndrivers/usb/cdns3/cdnsp-gadget.c-2068-\ndrivers/usb/cdns3/cdnsp-gadget.c:2069:\trdrv-\u003estart\t= __cdnsp_gadget_init;\ndrivers/usb/cdns3/cdnsp-gadget.c-2070-\trdrv-\u003estop\t= cdnsp_gadget_exit;\n--\ndrivers/usb/cdns3/cdnsp-pci.c=48=static int cdnsp_pci_probe(struct pci_dev *pdev,\n--\ndrivers/usb/cdns3/cdnsp-pci.c-153-\t\tcdnsp-\u003edev = dev;\ndrivers/usb/cdns3/cdnsp-pci.c:154:\t\tcdnsp-\u003egadget_init = cdnsp_gadget_init;\ndrivers/usb/cdns3/cdnsp-pci.c-155-\n--\ndrivers/usb/cdns3/core.c=83=static int cdns_core_init_role(struct cdns *cdns)\n--\ndrivers/usb/cdns3/core.c-155-\tif (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {\ndrivers/usb/cdns3/core.c:156:\t\tif (cdns-\u003egadget_init)\ndrivers/usb/cdns3/core.c:157:\t\t\tret = cdns-\u003egadget_init(cdns);\ndrivers/usb/cdns3/core.c-158-\t\telse\n--\ndrivers/usb/cdns3/core.h=42=struct cdns3_platform_data {\n--\ndrivers/usb/cdns3/core.h-83- *                        value in CHICKEN_BITS_3 will be preserved.\ndrivers/usb/cdns3/core.h:84: * @gadget_init: pointer to gadget initialization function\ndrivers/usb/cdns3/core.h-85- */\ndrivers/usb/cdns3/core.h=86=struct cdns {\n--\ndrivers/usb/cdns3/core.h-123-\ndrivers/usb/cdns3/core.h:124:\tint (*gadget_init)(struct cdns *cdns);\ndrivers/usb/cdns3/core.h-125-};\n--\ndrivers/usb/cdns3/gadget-export.h-14-\ndrivers/usb/cdns3/gadget-export.h:15:int cdnsp_gadget_init(struct cdns *cdns);\ndrivers/usb/cdns3/gadget-export.h-16-#else\ndrivers/usb/cdns3/gadget-export.h-17-\ndrivers/usb/cdns3/gadget-export.h:18:static inline int cdnsp_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/gadget-export.h-19-{\n--\ndrivers/usb/cdns3/gadget-export.h-26-\ndrivers/usb/cdns3/gadget-export.h:27:int cdns3_gadget_init(struct cdns *cdns);\ndrivers/usb/cdns3/gadget-export.h-28-#else\ndrivers/usb/cdns3/gadget-export.h-29-\ndrivers/usb/cdns3/gadget-export.h:30:static inline int cdns3_gadget_init(struct cdns *cdns)\ndrivers/usb/cdns3/gadget-export.h-31-{\n"
}

gemini-3.8-flash

null

null

							input: 30781
							output: 25
							thoughts: 280
						

**My Analysis of `cdnsp_gadget_init`**

Okay, so I see that `cdnsp_gadget_init` is *only* assigned within `cdnsp-pci.c`. Interesting. I need to understand the context here. I need to know what `cdnsp-pci` even *is*. Let's dig into the code itself.

Right, so `cdnsp-pci.c` defines a `cdnsp_pci_ids` array of `pci_device_id` structs. It looks like it handles PCI devices, specifically Cadence (CDNS) USB controllers. The array uses specific device IDs – `PCI_DEVICE_ID_CDNS_USBSSP`, and others that seem related. I need to decipher those IDs.

Time to look up the meanings of `PCI_VENDOR_ID_CDNS` and the `PCI_DEVICE_ID_CDNS_USBSSP` ID. I'll fire up a grep to find where those are defined. This will help me understand which Cadence USB controllers are involved and therefore the context of `cdnsp_gadget_init`.

{
  "Expression": "PCI_DEVICE_ID_CDNS_USBSSP"
}

{
  "Output": "drivers/usb/cdns3/cdnsp-pci.c=33=static struct pci_dev *cdnsp_get_second_fun(struct pci_dev *pdev)\n--\ndrivers/usb/cdns3/cdnsp-pci.c-39-\t */\ndrivers/usb/cdns3/cdnsp-pci.c:40:\tif (pdev-\u003edevice == PCI_DEVICE_ID_CDNS_USBSSP)\ndrivers/usb/cdns3/cdnsp-pci.c-41-\t\treturn pci_get_device(pdev-\u003evendor, PCI_DEVICE_ID_CDNS_USBSS, NULL);\ndrivers/usb/cdns3/cdnsp-pci.c-42-\tif (pdev-\u003edevice == PCI_DEVICE_ID_CDNS_USBSS)\ndrivers/usb/cdns3/cdnsp-pci.c:43:\t\treturn pci_get_device(pdev-\u003evendor, PCI_DEVICE_ID_CDNS_USBSSP, NULL);\ndrivers/usb/cdns3/cdnsp-pci.c-44-\n--\ndrivers/usb/cdns3/cdnsp-pci.c=222=static const struct pci_device_id cdnsp_pci_ids[] = {\ndrivers/usb/cdns3/cdnsp-pci.c:223:\t{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USBSSP),\ndrivers/usb/cdns3/cdnsp-pci.c-224-\t  .class = PCI_CLASS_SERIAL_USB_DEVICE },\ndrivers/usb/cdns3/cdnsp-pci.c:225:\t{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USBSSP),\ndrivers/usb/cdns3/cdnsp-pci.c-226-\t  .class = PCI_CLASS_SERIAL_USB_CDNS },\n--\ndrivers/usb/host/xhci-pci.c=251=static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)\n--\ndrivers/usb/host/xhci-pci.c-506-\tif (pdev-\u003evendor == PCI_VENDOR_ID_CDNS \u0026\u0026\ndrivers/usb/host/xhci-pci.c:507:\t    pdev-\u003edevice == PCI_DEVICE_ID_CDNS_USBSSP)\ndrivers/usb/host/xhci-pci.c-508-\t\txhci-\u003equirks |= XHCI_CDNS_SCTX_QUIRK;\n--\ninclude/linux/pci_ids.h-2425-#define PCI_DEVICE_ID_CDNS_USB\t\t0x0120\ninclude/linux/pci_ids.h:2426:#define PCI_DEVICE_ID_CDNS_USBSSP\t0x0200\ninclude/linux/pci_ids.h-2427-\n"
}

gemini-3.8-flash

null

null

							input: 32071
							output: 22
							thoughts: 33
						

Okay, here's my interpretation of that thought process, from an expert's perspective:

**Debugging a PCI ID**

Hold on a second... `PCI_VENDOR_ID_CDNS`? That rings a bell, but I need to be absolutely sure. Before I dive too deep into this, I need to verify that constant. My first instinct, as always, is to check the definitive source for this kind of PCI ID information. Okay, time to dive into `include/linux/pci_ids.h`. That's where I keep my master reference for these kinds of details. I need to be 100% certain I'm interpreting this correctly before I go any further, as any misinterpretation here will lead to problems.

{
  "Expression": "PCI_VENDOR_ID_CDNS"
}

{
  "Output": "drivers/usb/cdns3/cdnsp-pci.c=222=static const struct pci_device_id cdnsp_pci_ids[] = {\ndrivers/usb/cdns3/cdnsp-pci.c:223:\t{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USBSSP),\ndrivers/usb/cdns3/cdnsp-pci.c-224-\t  .class = PCI_CLASS_SERIAL_USB_DEVICE },\ndrivers/usb/cdns3/cdnsp-pci.c:225:\t{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USBSSP),\ndrivers/usb/cdns3/cdnsp-pci.c-226-\t  .class = PCI_CLASS_SERIAL_USB_CDNS },\ndrivers/usb/cdns3/cdnsp-pci.c:227:\t{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USBSS),\ndrivers/usb/cdns3/cdnsp-pci.c-228-\t  .class = PCI_CLASS_SERIAL_USB_CDNS },\n--\ndrivers/usb/gadget/udc/cdns2/cdns2-pci.c=114=static const struct pci_device_id cdns2_pci_ids[] = {\ndrivers/usb/gadget/udc/cdns2/cdns2-pci.c:115:\t{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USB),\ndrivers/usb/gadget/udc/cdns2/cdns2-pci.c-116-\t  .class = PCI_CLASS_SERIAL_USB_DEVICE },\n--\ndrivers/usb/host/xhci-pci.c=251=static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)\n--\ndrivers/usb/host/xhci-pci.c-505-\ndrivers/usb/host/xhci-pci.c:506:\tif (pdev-\u003evendor == PCI_VENDOR_ID_CDNS \u0026\u0026\ndrivers/usb/host/xhci-pci.c-507-\t    pdev-\u003edevice == PCI_DEVICE_ID_CDNS_USBSSP)\n--\ninclude/linux/pci_ids.h-2422-\ninclude/linux/pci_ids.h:2423:#define PCI_VENDOR_ID_CDNS\t\t0x17cd\ninclude/linux/pci_ids.h-2424-#define PCI_DEVICE_ID_CDNS_USBSS\t0x0100\n--\nrust/kernel/pci/id.rs=172=    fn fmt(\u0026self, f: \u0026mut fmt::Formatter\u003c'_\u003e) -\u003e fmt::Result {\n--\nrust/kernel/pci/id.rs-513-    QCOM                     = bindings::PCI_VENDOR_ID_QCOM,                     // 0x17cb\nrust/kernel/pci/id.rs:514:    CDNS                     = bindings::PCI_VENDOR_ID_CDNS,                     // 0x17cd\nrust/kernel/pci/id.rs-515-    ARECA                    = bindings::PCI_VENDOR_ID_ARECA,                    // 0x17d3\n"
}

gemini-3.8-flash

null

null

							input: 33129
							output: 133
							thoughts: 3335
						

**Analysis of Reachability for Fuzzing: Cadence CDNSP USB Controller Driver**

Okay, let's break this down. My initial thought was: Cadence, PCI, USB, this is interesting. I quickly zeroed in on the `PCI_VENDOR_ID_CDNS` identifier, that's Cadence Design Systems (0x17cd). Is this emulated in QEMU? No, QEMU's standard configurations don't emulate Cadence's specific USB controller. It's the standard QEMU xhci and EHCI emulation. I thought, can we reach this via USB gadgets or raw-gadget?  Ah, wait, the `cdnsp` driver is a USB Device Controller (UDC) driver, so it has to register as a UDC using `usb_add_gadget_udc` .  And that only happens in `__cdnsp_gadget_init` and that requires the PCI driver to probe. So, when does `cdnsp_pci_probe` get called? Only when a PCI device with the specific `PCI_DEVICE` IDs for the Cadence hardware is present! Can QEMU emulate that? Nope. No emulation or mocking of this Cadence PCI device. Okay, but what about the instructions and fuzzing guidelines, that's what I must follow to make the correct call.

I then went through the "REACHABILITY IS THE PRIMARY GATE" section of the instructions. The instructions clearly state that fuzzing can only be done in standard virtualized environments.  The instructions also clearly state that "Structurally unreachable hardware" MUST NOT be fuzzed.  The instructions specifically mention vendor-specific PCIe hardware like this that is not emulated in standard QEMU environments.

I dug deeper:  Is this `cdnsp` structurally unreachable?  Is the Cadence USBSS/USBSSP dual-role controller a *physical* hardware chip/IP?  Yes, it's an IP block from Cadence. I checked the code; the `cdnsp` is the Cadence SuperSpeed Plus (USBSSP) device controller driver, designed for use with Cadence USB IP cores on PCIe development boards, or in test chips. I checked `cdns3` vs `cdnsp`; it's clear `cdnsp-gadget.o` is strictly built into `cdnsp-udc-pci.ko` only when `CONFIG_USB_CDNSP_PCI` and `CONFIG_USB_CDNSP_GADGET` are set. It's not part of the standard `cdns3.ko` or anything else. The PCI IDs are very specific. There's no emulation in QEMU. Syzkaller, with its USB fuzzing setup, relies on the physical hardware probe. `cdnsp-gadget` requires that, to probe and initialize the controller and register with `usb_add_gadget_udc`. It's a PCI device driver, so the hardware has to be present.

Let's check `driver_override` or `new_id`. Looking at the `cdnsp_pci_probe` and `cdnsp_get_second_fun`, it checks for specific Cadence PCI device IDs, even returning `-EINVAL` if the device ID is not a specific Cadence ID and has two functions. The second function must also be one of the Cadence PCI device IDs!

So, the modified code, including the `pm_runtime_put_autosuspend` call, is within the *failure* path of `__cdnsp_gadget_init`, after all. It's in the failure path of the initialization of a driver for hardware that's not emulated.

Reviewing the guidelines again: "Structurally unreachable hardware... requiring physical ASIC/PCIe cards not emulated in standard QEMU." This is exactly it!

Therefore, `WorthFuzzing` is definitely `false`.

For `set-results`, I set `WorthFuzzing` to `false`. Then, `FocusSymbols` can be an empty list, and `EnableConfigs` can be an empty list, and the reasoning is clear. Everything looks good. Let's call `set-results`.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch modifies error handling in __cdnsp_gadget_init() within drivers/usb/cdns3/cdnsp-gadget.c. This code belongs to the Cadence CDNSP device controller driver (cdnsp-udc-pci), which requires proprietary Cadence PCI hardware (PCI_VENDOR_ID_CDNS 0x17cd). This hardware is not emulated in standard QEMU or virtualized fuzzing environments, making the modified code structurally unreachable.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies error handling in __cdnsp_gadget_init() within drivers/usb/cdns3/cdnsp-gadget.c. This code belongs to the Cadence CDNSP device controller driver (cdnsp-udc-pci), which requires proprietary Cadence PCI hardware (PCI_VENDOR_ID_CDNS 0x17cd). This hardware is not emulated in standard QEMU or virtualized fuzzing environments, making the modified code structurally unreachable.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null