AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/07/01 15:53	flow	patch-triage	1m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch adds a netlink multicast event `error-event` to the `drm_ras` family and integrates it into the `xe` DRM driver. The event is broadcasted by the kernel when hardware errors occur (handled in `hw_error_source_handler` and `xe_ras_counter_threshold_crossed`). These code paths are triggered by hardware interrupts and system controller events, which are impossible to reach from userspace in virtualized environments like QEMU or GCE without specific hardware emulation. Therefore, this patch does not introduce any new functionally reachable code for syzkaller to fuzz.", "WorthFuzzing": false }
1/1	2026/07/01 15:53	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 8751942c87c54fc99725dcf6698ff59f0be69c15\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Wed Jul 1 15:53:03 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/Documentation/gpu/drm-ras.rst b/Documentation/gpu/drm-ras.rst\nindex 83c21853b74b60..406e4c49bac1fd 100644\n--- a/Documentation/gpu/drm-ras.rst\n+++ b/Documentation/gpu/drm-ras.rst\n@@ -56,6 +56,7 @@ User space tools can:\n ``node-id`` and ``error-id`` as parameters.\n * Clear specific error counters with the ``clear-error-counter`` command, using both\n ``node-id`` and ``error-id`` as parameters.\n+* Subscribe to the ``error-report`` multicast group to receive ``error-event``.\n \n YAML-based Interface\n --------------------\n@@ -111,3 +112,23 @@ Example: Clear an error counter for a given node\n \n sudo ynl --family drm_ras --do clear-error-counter --json '{\"node-id\":0, \"error-id\":1}'\n None\n+\n+Example: Subscribe to ``error-report`` multicast group\n+\n+.. code-block:: bash\n+\n+ sudo ynl --family drm_ras --output-json --subscribe error-report\n+\n+.. code-block:: json\n+\n+ {\n+ \"name\": \"error-event\",\n+ \"msg\": {\n+ \"device-name\": \"0000:03:00.0\",\n+ \"node-id\": 1,\n+ \"node-name\": \"uncorrectable-errors\",\n+ \"error-id\": 1,\n+ \"error-name\": \"error_name1\",\n+ \"error-value\": 1\n+ }\n+ }\ndiff --git a/Documentation/netlink/specs/drm_ras.yaml b/Documentation/netlink/specs/drm_ras.yaml\nindex e113056f8c016c..8aed3d4515e5af 100644\n--- a/Documentation/netlink/specs/drm_ras.yaml\n+++ b/Documentation/netlink/specs/drm_ras.yaml\n@@ -69,6 +69,33 @@ attribute-sets:\n name: error-value\n type: u32\n doc: Current value of the requested error counter.\n+ -\n+ name: error-event-attrs\n+ attributes:\n+ -\n+ name: device-name\n+ type: string\n+ doc: Device (PCI BDF, UUID) that reported the error.\n+ -\n+ name: node-id\n+ type: u32\n+ doc: ID of the node that reported the error.\n+ -\n+ name: node-name\n+ type: string\n+ doc: Name of the node that reported the error.\n+ -\n+ name: error-id\n+ type: u32\n+ doc: ID of the error counter.\n+ -\n+ name: error-name\n+ type: string\n+ doc: Name of the error.\n+ -\n+ name: error-value\n+ type: u32\n+ doc: Current value of the error counter.\n \n operations:\n list:\n@@ -124,3 +151,24 @@ operations:\n do:\n request:\n attributes: id-attrs\n+ -\n+ name: error-event\n+ doc: \u003e-\n+ Report an error event to userspace.\n+ The event includes the device, node and error information\n+ of the error that triggered the event.\n+ attribute-set: error-event-attrs\n+ mcgrp: error-report\n+ event:\n+ attributes:\n+ - device-name\n+ - node-id\n+ - node-name\n+ - error-id\n+ - error-name\n+ - error-value\n+\n+mcast-groups:\n+ list:\n+ -\n+ name: error-report\ndiff --git a/drivers/gpu/drm/drm_ras.c b/drivers/gpu/drm/drm_ras.c\nindex d6eab29a1394ca..77f912a4d101f2 100644\n--- a/drivers/gpu/drm/drm_ras.c\n+++ b/drivers/gpu/drm/drm_ras.c\n@@ -41,6 +41,11 @@\n Userspace must provide Node ID, Error ID.\n * Clears specific error counter of a node if supported.\n \n+ 4. ERROR_REPORT: Subscribe to this multicast group to receive error events\n+ \n+ 5. ERROR_EVENT: Report an error event to userspace. The event contains device, node\n+ * and error information that triggered the event.\n+ \n Node registration:\n \n - drm_ras_node_register(): Registers a new node and assigns\n@@ -186,6 +191,34 @@ static int msg_reply_value(struct sk_buff msg, u32 error_id,\n \t\t\t value);\n }\n \n+static int msg_put_error_event_attrs(struct sk_buff msg, struct drm_ras_node node,\n+\t\t\t\t u32 error_id, const char error_name, u32 value)\n+{\n+\tint ret;\n+\n+\tret = nla_put_string(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_DEVICE_NAME, node-\u003edevice_name);\n+\tif (ret)\n+\t\treturn ret;\n+\n+\tret = nla_put_u32(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_ID, node-\u003eid);\n+\tif (ret)\n+\t\treturn ret;\n+\n+\tret = nla_put_string(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_NAME, node-\u003enode_name);\n+\tif (ret)\n+\t\treturn ret;\n+\n+\tret = nla_put_u32(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_ID, error_id);\n+\tif (ret)\n+\t\treturn ret;\n+\n+\tret = nla_put_string(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_NAME, error_name);\n+\tif (ret)\n+\t\treturn ret;\n+\n+\treturn nla_put_u32(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_VALUE, value);\n+}\n+\n static int doit_reply_value(struct genl_info info, u32 node_id,\n \t\t\t u32 error_id)\n {\n@@ -222,6 +255,60 @@ static int doit_reply_value(struct genl_info info, u32 node_id,\n \treturn genlmsg_reply(msg, info);\n }\n \n+/*\n+ drm_ras_nl_error_event() - Report an error event\n+ * @node: Node structure\n+ * @error_id: ID of the error\n+ * @error_name: Name of the error\n+ * @value: Value associated with the error\n+ * @flags: GFP flags for memory allocation\n+ \n+ Report an error-event to userspace using the error-report multicast group.\n+ \n+ Return: 0 on success, or negative errno on failure.\n+ /\n+int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id, const char error_name,\n+\t\t\t u32 value, gfp_t flags)\n+{\n+\tstruct genl_info info;\n+\tstruct sk_buff msg;\n+\tstruct nlattr hdr;\n+\tint ret;\n+\n+\tif (!error_name)\n+\t\treturn -EINVAL;\n+\n+\tif (!genl_has_listeners(\u0026drm_ras_nl_family, \u0026init_net, DRM_RAS_NLGRP_ERROR_REPORT))\n+\t\treturn 0;\n+\n+\tgenl_info_init_ntf(\u0026info, \u0026drm_ras_nl_family, DRM_RAS_CMD_ERROR_EVENT);\n+\n+\tmsg = genlmsg_new(NLMSG_GOODSIZE, flags);\n+\tif (!msg)\n+\t\treturn -ENOMEM;\n+\n+\thdr = genlmsg_iput(msg, \u0026info);\n+\tif (!hdr) {\n+\t\tret = -EMSGSIZE;\n+\t\tgoto free_msg;\n+\t}\n+\n+\tret = msg_put_error_event_attrs(msg, node, error_id, error_name, value);\n+\tif (ret)\n+\t\tgoto cancel_msg;\n+\n+\tgenlmsg_end(msg, hdr);\n+\tgenlmsg_multicast(\u0026drm_ras_nl_family, msg, 0, DRM_RAS_NLGRP_ERROR_REPORT, flags);\n+\treturn 0;\n+\n+cancel_msg:\n+\tgenlmsg_cancel(msg, hdr);\n+free_msg:\n+\tnlmsg_free(msg);\n+\treturn ret;\n+}\n+EXPORT_SYMBOL(drm_ras_nl_error_event);\n+\n /\n drm_ras_nl_get_error_counter_dumpit() - Dump all Error Counters\n * @skb: Netlink message buffer\ndiff --git a/drivers/gpu/drm/drm_ras_nl.c b/drivers/gpu/drm/drm_ras_nl.c\nindex dea1c1b2494e81..9d3123cc9f9caa 100644\n--- a/drivers/gpu/drm/drm_ras_nl.c\n+++ b/drivers/gpu/drm/drm_ras_nl.c\n@@ -58,6 +58,10 @@ static const struct genl_split_ops drm_ras_nl_ops[] = {\n \t},\n };\n \n+static const struct genl_multicast_group drm_ras_nl_mcgrps[] = {\n+\t[DRM_RAS_NLGRP_ERROR_REPORT] = { \"error-report\", },\n+};\n+\n struct genl_family drm_ras_nl_family __ro_after_init = {\n \t.name\t\t= DRM_RAS_FAMILY_NAME,\n \t.version\t= DRM_RAS_FAMILY_VERSION,\n@@ -66,4 +70,6 @@ struct genl_family drm_ras_nl_family __ro_after_init = {\n \t.module\t\t= THIS_MODULE,\n \t.split_ops\t= drm_ras_nl_ops,\n \t.n_split_ops\t= ARRAY_SIZE(drm_ras_nl_ops),\n+\t.mcgrps\t\t= drm_ras_nl_mcgrps,\n+\t.n_mcgrps\t= ARRAY_SIZE(drm_ras_nl_mcgrps),\n };\ndiff --git a/drivers/gpu/drm/drm_ras_nl.h b/drivers/gpu/drm/drm_ras_nl.h\nindex a398643572a5a0..03ec275aca9292 100644\n--- a/drivers/gpu/drm/drm_ras_nl.h\n+++ b/drivers/gpu/drm/drm_ras_nl.h\n@@ -21,6 +21,10 @@ int drm_ras_nl_get_error_counter_dumpit(struct sk_buff skb,\n int drm_ras_nl_clear_error_counter_doit(struct sk_buff skb,\n \t\t\t\t\tstruct genl_info info);\n \n+enum {\n+\tDRM_RAS_NLGRP_ERROR_REPORT,\n+};\n+\n extern struct genl_family drm_ras_nl_family;\n \n #endif / _LINUX_DRM_RAS_GEN_H /\ndiff --git a/drivers/gpu/drm/xe/xe_drm_ras.c b/drivers/gpu/drm/xe/xe_drm_ras.c\nindex 7937d8ba0ed9ce..bf77cce21974c7 100644\n--- a/drivers/gpu/drm/xe/xe_drm_ras.c\n+++ b/drivers/gpu/drm/xe/xe_drm_ras.c\n@@ -185,6 +185,38 @@ static int register_nodes(struct xe_device xe)\n \treturn ret;\n }\n \n+/*\n+ xe_drm_ras_event() - Report drm_ras error event to userspace\n+ * @xe: xe device structure\n+ * @component: error component (see \u0026enum drm_xe_ras_error_component)\n+ * @severity: error severity (see \u0026enum drm_xe_ras_error_severity)\n+ * @value: value of error counter\n+ * @flags: flags for allocation\n+ \n+ Report an error-event to userspace.\n+ /\n+void xe_drm_ras_event(struct xe_device xe, u32 component, u32 severity, u32 value, gfp_t flags)\n+{\n+\tstruct xe_drm_ras ras = \u0026xe-\u003eras;\n+\tstruct xe_drm_ras_counter info = ras-\u003einfo[severity];\n+\tstruct drm_ras_node node;\n+\tint ret;\n+\n+\t/ Event is supported only if drm_ras is enabled /\n+\tif (!xe-\u003einfo.has_drm_ras)\n+\t\treturn;\n+\n+\tnode = \u0026ras-\u003enode[severity];\n+\n+\tif (!info \|\| !info[component].name)\n+\t\treturn;\n+\n+\tret = drm_ras_nl_error_event(node, component, info[component].name, value, flags);\n+\tif (ret)\n+\t\tdrm_err_ratelimited(\u0026xe-\u003edrm, \"drm_ras error-event failed: %d for %s %s\\n\", ret,\n+\t\t\t\t info[component].name, error_severity[severity]);\n+}\n+\n /\n xe_drm_ras_init() - Initialize DRM RAS\n * @xe: xe device instance\ndiff --git a/drivers/gpu/drm/xe/xe_drm_ras.h b/drivers/gpu/drm/xe/xe_drm_ras.h\nindex 365c70e93e82fd..2a694bf6947840 100644\n--- a/drivers/gpu/drm/xe/xe_drm_ras.h\n+++ b/drivers/gpu/drm/xe/xe_drm_ras.h\n@@ -5,11 +5,14 @@\n #ifndef _XE_DRM_RAS_H_\n #define _XE_DRM_RAS_H_\n \n+#include \u003clinux/types.h\u003e\n+\n struct xe_device;\n \n #define for_each_error_severity(i)\t\\\n \tfor (i = 0; i \u003c DRM_XE_RAS_ERR_SEV_MAX; i++)\n \n int xe_drm_ras_init(struct xe_device xe);\n+void xe_drm_ras_event(struct xe_device xe, u32 component, u32 severity, u32 value, gfp_t flags);\n \n #endif\ndiff --git a/drivers/gpu/drm/xe/xe_hw_error.c b/drivers/gpu/drm/xe/xe_hw_error.c\nindex 4a4b363fc844b6..a833cecc74ec5b 100644\n--- a/drivers/gpu/drm/xe/xe_hw_error.c\n+++ b/drivers/gpu/drm/xe/xe_hw_error.c\n@@ -432,7 +432,7 @@ static void hw_error_source_handler(struct xe_tile tile, const enum hardware_er\n \tstruct xe_drm_ras ras = \u0026xe-\u003eras;\n \tstruct xe_drm_ras_counter info = ras-\u003einfo[severity];\n \tunsigned long flags, err_src;\n-\tu32 err_bit;\n+\tu32 err_bit, value;\n \n \tif (!IS_DGFX(xe))\n \t\treturn;\n@@ -495,6 +495,9 @@ static void hw_error_source_handler(struct xe_tile tile, const enum hardware_er\n \t\t\tgt_hw_error_handler(tile, hw_err, error_id);\n \t\tif (err_bit == XE_SOC_ERROR)\n \t\t\tsoc_hw_error_handler(tile, hw_err, error_id);\n+\n+\t\tvalue = atomic_read(\u0026info[error_id].counter);\n+\t\txe_drm_ras_event(xe, error_id, severity, value, GFP_ATOMIC);\n \t}\n \n clear_reg:\ndiff --git a/drivers/gpu/drm/xe/xe_ras.c b/drivers/gpu/drm/xe/xe_ras.c\nindex 44f4e1a3455b7c..b71d5128595451 100644\n--- a/drivers/gpu/drm/xe/xe_ras.c\n+++ b/drivers/gpu/drm/xe/xe_ras.c\n@@ -77,6 +77,18 @@ static u8 drm_to_xe_ras_severity(u8 severity)\n \t}\n }\n \n+static u8 xe_to_drm_ras_severity(u8 severity)\n+{\n+\tswitch (severity) {\n+\tcase XE_RAS_SEV_CORRECTABLE:\n+\t\treturn DRM_XE_RAS_ERR_SEV_CORRECTABLE;\n+\tcase XE_RAS_SEV_UNCORRECTABLE:\n+\t\treturn DRM_XE_RAS_ERR_SEV_UNCORRECTABLE;\n+\tdefault:\n+\t\treturn DRM_XE_RAS_ERR_SEV_MAX;\n+\t}\n+}\n+\n static u8 drm_to_xe_ras_component(u8 component)\n {\n \tswitch (component) {\n@@ -95,6 +107,24 @@ static u8 drm_to_xe_ras_component(u8 component)\n \t}\n }\n \n+static u8 xe_to_drm_ras_component(u8 component)\n+{\n+\tswitch (component) {\n+\tcase XE_RAS_COMP_DEVICE_MEMORY:\n+\t\treturn DRM_XE_RAS_ERR_COMP_DEVICE_MEMORY;\n+\tcase XE_RAS_COMP_CORE_COMPUTE:\n+\t\treturn DRM_XE_RAS_ERR_COMP_CORE_COMPUTE;\n+\tcase XE_RAS_COMP_PCIE:\n+\t\treturn DRM_XE_RAS_ERR_COMP_PCIE;\n+\tcase XE_RAS_COMP_FABRIC:\n+\t\treturn DRM_XE_RAS_ERR_COMP_FABRIC;\n+\tcase XE_RAS_COMP_SOC_INTERNAL:\n+\t\treturn DRM_XE_RAS_ERR_COMP_SOC_INTERNAL;\n+\tdefault:\n+\t\treturn DRM_XE_RAS_ERR_COMP_MAX;\n+\t}\n+}\n+\n static int ras_status_to_errno(u32 status)\n {\n \tswitch (status) {\n@@ -131,14 +161,41 @@ static inline const char comp_to_str(u8 component)\n \treturn xe_ras_components[component];\n }\n \n+static void ras_send_error_event(struct xe_device xe, u8 severity, u8 component)\n+{\n+\tu8 drm_severity, drm_component;\n+\tu32 value;\n+\tint ret;\n+\n+\tdrm_severity = xe_to_drm_ras_severity(severity);\n+\tif (drm_severity == DRM_XE_RAS_ERR_SEV_MAX) {\n+\t\txe_warn(xe, \"sysctrl: unexpected severity %u\\n\", severity);\n+\t\treturn;\n+\t}\n+\n+\tdrm_component = xe_to_drm_ras_component(component);\n+\tif (drm_component == DRM_XE_RAS_ERR_COMP_MAX) {\n+\t\txe_warn(xe, \"sysctrl: unexpected component %u\\n\", component);\n+\t\treturn;\n+\t}\n+\n+\tret = xe_ras_get_counter(xe, drm_severity, drm_component, \u0026value);\n+\tif (ret)\n+\t\treturn;\n+\n+\txe_drm_ras_event(xe, drm_component, drm_severity, value, GFP_KERNEL);\n+}\n+\n void xe_ras_counter_threshold_crossed(struct xe_device xe,\n \t\t\t\t struct xe_sysctrl_event_response response)\n {\n \tstruct xe_ras_threshold_crossed pending = (void )\u0026response-\u003edata;\n \tstruct xe_ras_error_class errors = pending-\u003ecounters;\n \tu32 id, ncounters = pending-\u003encounters;\n+\tu8 sent = 0;\n \n \tBUILD_BUG_ON(sizeof(response-\u003edata) \u003c sizeof(pending));\n+\tBUILD_BUG_ON(XE_RAS_COMP_MAX \u003e (BITS_PER_BYTE * sizeof(sent)));\n \txe_device_assert_mem_access(xe);\n \n \tif (!ncounters \|\| ncounters \u003e XE_RAS_NUM_COUNTERS)\n@@ -154,6 +211,24 @@ void xe_ras_counter_threshold_crossed(struct xe_device xe,\n \n \t\txe_warn(xe, \"[RAS]: %s %s detected\\n\",\n \t\t\tcomp_to_str(component), sev_to_str(severity));\n+\n+\t\tif (severity != XE_RAS_SEV_CORRECTABLE) {\n+\t\t\txe_warn(xe, \"sysctrl: unexpected severity %s (%u)\\n\", sev_to_str(severity),\n+\t\t\t\tseverity);\n+\t\t\tcontinue;\n+\t\t}\n+\n+\t\tif (component \u003e= XE_RAS_COMP_MAX) {\n+\t\t\txe_warn(xe, \"sysctrl: unexpected component %u\\n\", component);\n+\t\t\tcontinue;\n+\t\t}\n+\n+\t\t/ Send event once per component /\n+\t\tif (sent \u0026 BIT(component))\n+\t\t\tcontinue;\n+\t\tsent \|= BIT(component);\n+\n+\t\tras_send_error_event(xe, severity, component);\n \t}\n }\n \ndiff --git a/include/drm/drm_ras.h b/include/drm/drm_ras.h\nindex 0beede3ddc4e4b..8abfb7d2077b5f 100644\n--- a/include/drm/drm_ras.h\n+++ b/include/drm/drm_ras.h\n@@ -80,9 +80,14 @@ struct drm_device;\n #if IS_ENABLED(CONFIG_DRM_RAS)\n int drm_ras_node_register(struct drm_ras_node node);\n void drm_ras_node_unregister(struct drm_ras_node node);\n+int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id, const char error_name,\n+\t\t\t u32 value, gfp_t flags);\n #else\n static inline int drm_ras_node_register(struct drm_ras_node node) { return 0; }\n static inline void drm_ras_node_unregister(struct drm_ras_node node) { }\n+static inline int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id,\n+\t\t\t\t\t const char error_name, u32 value, gfp_t flags)\n+{ return 0; }\n #endif\n \n #endif\ndiff --git a/include/uapi/drm/drm_ras.h b/include/uapi/drm/drm_ras.h\nindex 218a3ee8680527..eab8231aa87cbf 100644\n--- a/include/uapi/drm/drm_ras.h\n+++ b/include/uapi/drm/drm_ras.h\n@@ -38,13 +38,28 @@ enum {\n \tDRM_RAS_A_ERROR_COUNTER_ATTRS_MAX = (__DRM_RAS_A_ERROR_COUNTER_ATTRS_MAX - 1)\n };\n \n+enum {\n+\tDRM_RAS_A_ERROR_EVENT_ATTRS_DEVICE_NAME = 1,\n+\tDRM_RAS_A_ERROR_EVENT_ATTRS_NODE_ID,\n+\tDRM_RAS_A_ERROR_EVENT_ATTRS_NODE_NAME,\n+\tDRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_ID,\n+\tDRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_NAME,\n+\tDRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_VALUE,\n+\n+\t__DRM_RAS_A_ERROR_EVENT_ATTRS_MAX,\n+\tDRM_RAS_A_ERROR_EVENT_ATTRS_MAX = (__DRM_RAS_A_ERROR_EVENT_ATTRS_MAX - 1)\n+};\n+\n enum {\n \tDRM_RAS_CMD_LIST_NODES = 1,\n \tDRM_RAS_CMD_GET_ERROR_COUNTER,\n \tDRM_RAS_CMD_CLEAR_ERROR_COUNTER,\n+\tDRM_RAS_CMD_ERROR_EVENT,\n \n \t__DRM_RAS_CMD_MAX,\n \tDRM_RAS_CMD_MAX = (__DRM_RAS_CMD_MAX - 1)\n };\n \n+#define DRM_RAS_MCGRP_ERROR_REPORT\t\"error-report\"\n+\n #endif / _UAPI_LINUX_DRM_RAS_H */\n" }
2/1	2026/07/01 15:53	agent	patch-evaluator	1m Model: gemini-3.1-pro-preview Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch adds a netlink multicast event `error-event` to the `drm_ras` family and integrates it into the `xe` DRM driver. The event is broadcasted by the kernel when hardware errors occur (handled in `hw_error_source_handler` and `xe_ras_counter_threshold_crossed`). These code paths are triggered by hardware interrupts and system controller events, which are impossible to reach from userspace in virtualized environments like QEMU or GCE without specific hardware emulation. Therefore, this patch does not introduce any new functionally reachable code for syzkaller to fuzz.", "WorthFuzzing": false } Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Do not list too generic configs (we already have them enabled). Only list those that specifically cover the modified code. List them in the EnableConfigs output array, and DO NOT add a '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: For your convenience, here is the diff of the changes: commit 8751942c87c54fc99725dcf6698ff59f0be69c15 Author: syz-cluster <triage@syzkaller.com> Date: Wed Jul 1 15:53:03 2026 +0000 syz-cluster: applied patch under review diff --git a/Documentation/gpu/drm-ras.rst b/Documentation/gpu/drm-ras.rst index 83c21853b74b60..406e4c49bac1fd 100644 --- a/Documentation/gpu/drm-ras.rst +++ b/Documentation/gpu/drm-ras.rst @@ -56,6 +56,7 @@ User space tools can: ``node-id`` and ``error-id`` as parameters. * Clear specific error counters with the ``clear-error-counter`` command, using both ``node-id`` and ``error-id`` as parameters. +* Subscribe to the ``error-report`` multicast group to receive ``error-event``. YAML-based Interface -------------------- @@ -111,3 +112,23 @@ Example: Clear an error counter for a given node sudo ynl --family drm_ras --do clear-error-counter --json '{"node-id":0, "error-id":1}' None + +Example: Subscribe to ``error-report`` multicast group + +.. code-block:: bash + + sudo ynl --family drm_ras --output-json --subscribe error-report + +.. code-block:: json + + { + "name": "error-event", + "msg": { + "device-name": "0000:03:00.0", + "node-id": 1, + "node-name": "uncorrectable-errors", + "error-id": 1, + "error-name": "error_name1", + "error-value": 1 + } + } diff --git a/Documentation/netlink/specs/drm_ras.yaml b/Documentation/netlink/specs/drm_ras.yaml index e113056f8c016c..8aed3d4515e5af 100644 --- a/Documentation/netlink/specs/drm_ras.yaml +++ b/Documentation/netlink/specs/drm_ras.yaml @@ -69,6 +69,33 @@ attribute-sets: name: error-value type: u32 doc: Current value of the requested error counter. + - + name: error-event-attrs + attributes: + - + name: device-name + type: string + doc: Device (PCI BDF, UUID) that reported the error. + - + name: node-id + type: u32 + doc: ID of the node that reported the error. + - + name: node-name + type: string + doc: Name of the node that reported the error. + - + name: error-id + type: u32 + doc: ID of the error counter. + - + name: error-name + type: string + doc: Name of the error. + - + name: error-value + type: u32 + doc: Current value of the error counter. operations: list: @@ -124,3 +151,24 @@ operations: do: request: attributes: id-attrs + - + name: error-event + doc: >- + Report an error event to userspace. + The event includes the device, node and error information + of the error that triggered the event. + attribute-set: error-event-attrs + mcgrp: error-report + event: + attributes: + - device-name + - node-id + - node-name + - error-id + - error-name + - error-value + +mcast-groups: + list: + - + name: error-report diff --git a/drivers/gpu/drm/drm_ras.c b/drivers/gpu/drm/drm_ras.c index d6eab29a1394ca..77f912a4d101f2 100644 --- a/drivers/gpu/drm/drm_ras.c +++ b/drivers/gpu/drm/drm_ras.c @@ -41,6 +41,11 @@ Userspace must provide Node ID, Error ID. * Clears specific error counter of a node if supported. * + * 4. ERROR_REPORT: Subscribe to this multicast group to receive error events + * + * 5. ERROR_EVENT: Report an error event to userspace. The event contains device, node + * and error information that triggered the event. + * * Node registration: * * - drm_ras_node_register(): Registers a new node and assigns @@ -186,6 +191,34 @@ static int msg_reply_value(struct sk_buff msg, u32 error_id, value); } +static int msg_put_error_event_attrs(struct sk_buff msg, struct drm_ras_node node, + u32 error_id, const char error_name, u32 value) +{ + int ret; + + ret = nla_put_string(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_DEVICE_NAME, node->device_name); + if (ret) + return ret; + + ret = nla_put_u32(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_ID, node->id); + if (ret) + return ret; + + ret = nla_put_string(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_NAME, node->node_name); + if (ret) + return ret; + + ret = nla_put_u32(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_ID, error_id); + if (ret) + return ret; + + ret = nla_put_string(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_NAME, error_name); + if (ret) + return ret; + + return nla_put_u32(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_VALUE, value); +} + static int doit_reply_value(struct genl_info info, u32 node_id, u32 error_id) { @@ -222,6 +255,60 @@ static int doit_reply_value(struct genl_info info, u32 node_id, return genlmsg_reply(msg, info); } +/** + * drm_ras_nl_error_event() - Report an error event + * @node: Node structure + * @error_id: ID of the error + * @error_name: Name of the error + * @value: Value associated with the error + * @flags: GFP flags for memory allocation + * + * Report an error-event to userspace using the error-report multicast group. + * + * Return: 0 on success, or negative errno on failure. + / +int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id, const char error_name, + u32 value, gfp_t flags) +{ + struct genl_info info; + struct sk_buff msg; + struct nlattr hdr; + int ret; + + if (!error_name) + return -EINVAL; + + if (!genl_has_listeners(&drm_ras_nl_family, &init_net, DRM_RAS_NLGRP_ERROR_REPORT)) + return 0; + + genl_info_init_ntf(&info, &drm_ras_nl_family, DRM_RAS_CMD_ERROR_EVENT); + + msg = genlmsg_new(NLMSG_GOODSIZE, flags); + if (!msg) + return -ENOMEM; + + hdr = genlmsg_iput(msg, &info); + if (!hdr) { + ret = -EMSGSIZE; + goto free_msg; + } + + ret = msg_put_error_event_attrs(msg, node, error_id, error_name, value); + if (ret) + goto cancel_msg; + + genlmsg_end(msg, hdr); + genlmsg_multicast(&drm_ras_nl_family, msg, 0, DRM_RAS_NLGRP_ERROR_REPORT, flags); + return 0; + +cancel_msg: + genlmsg_cancel(msg, hdr); +free_msg: + nlmsg_free(msg); + return ret; +} +EXPORT_SYMBOL(drm_ras_nl_error_event); + /* * drm_ras_nl_get_error_counter_dumpit() - Dump all Error Counters * @skb: Netlink message buffer diff --git a/drivers/gpu/drm/drm_ras_nl.c b/drivers/gpu/drm/drm_ras_nl.c index dea1c1b2494e81..9d3123cc9f9caa 100644 --- a/drivers/gpu/drm/drm_ras_nl.c +++ b/drivers/gpu/drm/drm_ras_nl.c @@ -58,6 +58,10 @@ static const struct genl_split_ops drm_ras_nl_ops[] = { }, }; +static const struct genl_multicast_group drm_ras_nl_mcgrps[] = { + [DRM_RAS_NLGRP_ERROR_REPORT] = { "error-report", }, +}; + struct genl_family drm_ras_nl_family __ro_after_init = { .name = DRM_RAS_FAMILY_NAME, .version = DRM_RAS_FAMILY_VERSION, @@ -66,4 +70,6 @@ struct genl_family drm_ras_nl_family __ro_after_init = { .module = THIS_MODULE, .split_ops = drm_ras_nl_ops, .n_split_ops = ARRAY_SIZE(drm_ras_nl_ops), + .mcgrps = drm_ras_nl_mcgrps, + .n_mcgrps = ARRAY_SIZE(drm_ras_nl_mcgrps), }; diff --git a/drivers/gpu/drm/drm_ras_nl.h b/drivers/gpu/drm/drm_ras_nl.h index a398643572a5a0..03ec275aca9292 100644 --- a/drivers/gpu/drm/drm_ras_nl.h +++ b/drivers/gpu/drm/drm_ras_nl.h @@ -21,6 +21,10 @@ int drm_ras_nl_get_error_counter_dumpit(struct sk_buff skb, int drm_ras_nl_clear_error_counter_doit(struct sk_buff skb, struct genl_info info); +enum { + DRM_RAS_NLGRP_ERROR_REPORT, +}; + extern struct genl_family drm_ras_nl_family; #endif / _LINUX_DRM_RAS_GEN_H / diff --git a/drivers/gpu/drm/xe/xe_drm_ras.c b/drivers/gpu/drm/xe/xe_drm_ras.c index 7937d8ba0ed9ce..bf77cce21974c7 100644 --- a/drivers/gpu/drm/xe/xe_drm_ras.c +++ b/drivers/gpu/drm/xe/xe_drm_ras.c @@ -185,6 +185,38 @@ static int register_nodes(struct xe_device xe) return ret; } +/** + * xe_drm_ras_event() - Report drm_ras error event to userspace + * @xe: xe device structure + * @component: error component (see &enum drm_xe_ras_error_component) + * @severity: error severity (see &enum drm_xe_ras_error_severity) + * @value: value of error counter + * @flags: flags for allocation + * + * Report an error-event to userspace. + / +void xe_drm_ras_event(struct xe_device xe, u32 component, u32 severity, u32 value, gfp_t flags) +{ + struct xe_drm_ras ras = &xe->ras; + struct xe_drm_ras_counter info = ras->info[severity]; + struct drm_ras_node node; + int ret; + + / Event is supported only if drm_ras is enabled / + if (!xe->info.has_drm_ras) + return; + + node = &ras->node[severity]; + + if (!info \|\| !info[component].name) + return; + + ret = drm_ras_nl_error_event(node, component, info[component].name, value, flags); + if (ret) + drm_err_ratelimited(&xe->drm, "drm_ras error-event failed: %d for %s %s\n", ret, + info[component].name, error_severity[severity]); +} + /* * xe_drm_ras_init() - Initialize DRM RAS * @xe: xe device instance diff --git a/drivers/gpu/drm/xe/xe_drm_ras.h b/drivers/gpu/drm/xe/xe_drm_ras.h index 365c70e93e82fd..2a694bf6947840 100644 --- a/drivers/gpu/drm/xe/xe_drm_ras.h +++ b/drivers/gpu/drm/xe/xe_drm_ras.h @@ -5,11 +5,14 @@ #ifndef _XE_DRM_RAS_H_ #define _XE_DRM_RAS_H_ +#include <linux/types.h> + struct xe_device; #define for_each_error_severity(i) \ for (i = 0; i < DRM_XE_RAS_ERR_SEV_MAX; i++) int xe_drm_ras_init(struct xe_device xe); +void xe_drm_ras_event(struct xe_device xe, u32 component, u32 severity, u32 value, gfp_t flags); #endif diff --git a/drivers/gpu/drm/xe/xe_hw_error.c b/drivers/gpu/drm/xe/xe_hw_error.c index 4a4b363fc844b6..a833cecc74ec5b 100644 --- a/drivers/gpu/drm/xe/xe_hw_error.c +++ b/drivers/gpu/drm/xe/xe_hw_error.c @@ -432,7 +432,7 @@ static void hw_error_source_handler(struct xe_tile tile, const enum hardware_er struct xe_drm_ras ras = &xe->ras; struct xe_drm_ras_counter info = ras->info[severity]; unsigned long flags, err_src; - u32 err_bit; + u32 err_bit, value; if (!IS_DGFX(xe)) return; @@ -495,6 +495,9 @@ static void hw_error_source_handler(struct xe_tile tile, const enum hardware_er gt_hw_error_handler(tile, hw_err, error_id); if (err_bit == XE_SOC_ERROR) soc_hw_error_handler(tile, hw_err, error_id); + + value = atomic_read(&info[error_id].counter); + xe_drm_ras_event(xe, error_id, severity, value, GFP_ATOMIC); } clear_reg: diff --git a/drivers/gpu/drm/xe/xe_ras.c b/drivers/gpu/drm/xe/xe_ras.c index 44f4e1a3455b7c..b71d5128595451 100644 --- a/drivers/gpu/drm/xe/xe_ras.c +++ b/drivers/gpu/drm/xe/xe_ras.c @@ -77,6 +77,18 @@ static u8 drm_to_xe_ras_severity(u8 severity) } } +static u8 xe_to_drm_ras_severity(u8 severity) +{ + switch (severity) { + case XE_RAS_SEV_CORRECTABLE: + return DRM_XE_RAS_ERR_SEV_CORRECTABLE; + case XE_RAS_SEV_UNCORRECTABLE: + return DRM_XE_RAS_ERR_SEV_UNCORRECTABLE; + default: + return DRM_XE_RAS_ERR_SEV_MAX; + } +} + static u8 drm_to_xe_ras_component(u8 component) { switch (component) { @@ -95,6 +107,24 @@ static u8 drm_to_xe_ras_component(u8 component) } } +static u8 xe_to_drm_ras_component(u8 component) +{ + switch (component) { + case XE_RAS_COMP_DEVICE_MEMORY: + return DRM_XE_RAS_ERR_COMP_DEVICE_MEMORY; + case XE_RAS_COMP_CORE_COMPUTE: + return DRM_XE_RAS_ERR_COMP_CORE_COMPUTE; + case XE_RAS_COMP_PCIE: + return DRM_XE_RAS_ERR_COMP_PCIE; + case XE_RAS_COMP_FABRIC: + return DRM_XE_RAS_ERR_COMP_FABRIC; + case XE_RAS_COMP_SOC_INTERNAL: + return DRM_XE_RAS_ERR_COMP_SOC_INTERNAL; + default: + return DRM_XE_RAS_ERR_COMP_MAX; + } +} + static int ras_status_to_errno(u32 status) { switch (status) { @@ -131,14 +161,41 @@ static inline const char comp_to_str(u8 component) return xe_ras_components[component]; } +static void ras_send_error_event(struct xe_device xe, u8 severity, u8 component) +{ + u8 drm_severity, drm_component; + u32 value; + int ret; + + drm_severity = xe_to_drm_ras_severity(severity); + if (drm_severity == DRM_XE_RAS_ERR_SEV_MAX) { + xe_warn(xe, "sysctrl: unexpected severity %u\n", severity); + return; + } + + drm_component = xe_to_drm_ras_component(component); + if (drm_component == DRM_XE_RAS_ERR_COMP_MAX) { + xe_warn(xe, "sysctrl: unexpected component %u\n", component); + return; + } + + ret = xe_ras_get_counter(xe, drm_severity, drm_component, &value); + if (ret) + return; + + xe_drm_ras_event(xe, drm_component, drm_severity, value, GFP_KERNEL); +} + void xe_ras_counter_threshold_crossed(struct xe_device xe, struct xe_sysctrl_event_response response) { struct xe_ras_threshold_crossed pending = (void )&response->data; struct xe_ras_error_class errors = pending->counters; u32 id, ncounters = pending->ncounters; + u8 sent = 0; BUILD_BUG_ON(sizeof(response->data) < sizeof(pending)); + BUILD_BUG_ON(XE_RAS_COMP_MAX > (BITS_PER_BYTE * sizeof(sent))); xe_device_assert_mem_access(xe); if (!ncounters \|\| ncounters > XE_RAS_NUM_COUNTERS) @@ -154,6 +211,24 @@ void xe_ras_counter_threshold_crossed(struct xe_device xe, xe_warn(xe, "[RAS]: %s %s detected\n", comp_to_str(component), sev_to_str(severity)); + + if (severity != XE_RAS_SEV_CORRECTABLE) { + xe_warn(xe, "sysctrl: unexpected severity %s (%u)\n", sev_to_str(severity), + severity); + continue; + } + + if (component >= XE_RAS_COMP_MAX) { + xe_warn(xe, "sysctrl: unexpected component %u\n", component); + continue; + } + + / Send event once per component / + if (sent & BIT(component)) + continue; + sent \|= BIT(component); + + ras_send_error_event(xe, severity, component); } } diff --git a/include/drm/drm_ras.h b/include/drm/drm_ras.h index 0beede3ddc4e4b..8abfb7d2077b5f 100644 --- a/include/drm/drm_ras.h +++ b/include/drm/drm_ras.h @@ -80,9 +80,14 @@ struct drm_device; #if IS_ENABLED(CONFIG_DRM_RAS) int drm_ras_node_register(struct drm_ras_node node); void drm_ras_node_unregister(struct drm_ras_node node); +int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id, const char error_name, + u32 value, gfp_t flags); #else static inline int drm_ras_node_register(struct drm_ras_node node) { return 0; } static inline void drm_ras_node_unregister(struct drm_ras_node node) { } +static inline int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id, + const char error_name, u32 value, gfp_t flags) +{ return 0; } #endif #endif diff --git a/include/uapi/drm/drm_ras.h b/include/uapi/drm/drm_ras.h index 218a3ee8680527..eab8231aa87cbf 100644 --- a/include/uapi/drm/drm_ras.h +++ b/include/uapi/drm/drm_ras.h @@ -38,13 +38,28 @@ enum { DRM_RAS_A_ERROR_COUNTER_ATTRS_MAX = (__DRM_RAS_A_ERROR_COUNTER_ATTRS_MAX - 1) }; +enum { + DRM_RAS_A_ERROR_EVENT_ATTRS_DEVICE_NAME = 1, + DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_ID, + DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_NAME, + DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_ID, + DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_NAME, + DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_VALUE, + + __DRM_RAS_A_ERROR_EVENT_ATTRS_MAX, + DRM_RAS_A_ERROR_EVENT_ATTRS_MAX = (__DRM_RAS_A_ERROR_EVENT_ATTRS_MAX - 1) +}; + enum { DRM_RAS_CMD_LIST_NODES = 1, DRM_RAS_CMD_GET_ERROR_COUNTER, DRM_RAS_CMD_CLEAR_ERROR_COUNTER, + DRM_RAS_CMD_ERROR_EVENT, __DRM_RAS_CMD_MAX, DRM_RAS_CMD_MAX = (__DRM_RAS_CMD_MAX - 1) }; +#define DRM_RAS_MCGRP_ERROR_REPORT "error-report" + #endif / _UAPI_LINUX_DRM_RAS_H */
3/2	2026/07/01 15:53	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7947 output: 23 thoughts: 841 Thoughts: Analyzing the Reachability and Fuzzing Potential of the DRM RAS Error Event Patch Okay, so we have this patch that introduces an `error-event` multicast group to the `drm_ras` netlink family. It adds `drm_ras_nl_error_event` which is essentially the function that constructs and sends these netlink multicast messages. This is integrated into the `xe` DRM driver, specifically called from `hw_error_source_handler` and `xe_ras_counter_threshold_crossed`. My immediate thought is, is this even reachable from userspace, and is it worth fuzzing? Let's break it down. `drm_ras_nl_error_event` takes a bunch of arguments, builds a netlink message, and then uses `genlmsg_multicast` to send it. This sounds pretty straightforward. This is triggered by hardware errors within the `xe` driver. The question is, can syzkaller reliably trigger those hardware errors? `hw_error_source_handler` is called on a hardware error, and `xe_ras_counter_threshold_crossed` is called on a sysctrl event response. The complexity here is whether we can control those events. Likely not directly, but we can subscribe to the multicast group. The patch adds a new netlink multicast group called `error-report`. We subscribe to multicast groups using `setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, ...)`. Critically, this patch doesn't add any new netlink commands that userspace can send, except maybe `error-event` is an event, not a command. Wait, looking closer, `DRM_RAS_CMD_ERROR_EVENT` is indeed added. Let's look at the documentation, `Documentation/netlink/specs/drm_ras.yaml`. Ah, it's explicitly defined as an event, not a command userspace can send. It's an event userspace receives. The description says it reports an error event including device, node, and error information. The YAML file confirms there are no `do` or `dump` operations defined for `error-event`, only `event`. Okay, let's verify that the kernel side doesn't expose this command for sending via userspace. I'll check `drivers/gpu/drm/drm_ras_nl.c` for `drm_ras_nl_ops`. And, yes, the patch doesn't add `DRM_RAS_CMD_ERROR_EVENT` to the list of operations. Thus, userspace cannot send this command to the kernel. Therefore, the only thing userspace can do is subscribe to the `error-report` multicast group. This is handled by the generic netlink code, which is well-trodden ground. The new code is `drm_ras_nl_error_event`, which is called by the `xe` driver when hardware errors occur. Can syzkaller reliably trigger those `xe` hardware errors? Probably not easily, unless there's a way to inject them. Even if it can trigger them, all the added code does is construct and broadcast a netlink message. So, is it worth fuzzing? The netlink message construction in `drm_ras_nl_error_event` looks pretty standard. There isn't much complexity there. It's essentially just packaging up data that the `xe` driver already knows. Let me check if `drm_ras_nl_error_event` is triggered by any userspace action. I'll use `grepper` to see where `drm_ras_nl_error_event` is called.
4/2	2026/07/01 15:53	tool	grepper	0m Args: { "Expression": "drm_ras_nl_error_event" } Results: { "Output": "drivers/gpu/drm/drm_ras.c=222=static int doit_reply_value(struct genl_info info, u32 node_id,\n--\ndrivers/gpu/drm/drm_ras.c-258-/\ndrivers/gpu/drm/drm_ras.c:259: drm_ras_nl_error_event() - Report an error event\ndrivers/gpu/drm/drm_ras.c-260- * @node: Node structure\n--\ndrivers/gpu/drm/drm_ras.c-269- /\ndrivers/gpu/drm/drm_ras.c:270:int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id, const char error_name,\ndrivers/gpu/drm/drm_ras.c-271-\t\t\t u32 value, gfp_t flags)\n--\ndrivers/gpu/drm/drm_ras.c-309-}\ndrivers/gpu/drm/drm_ras.c:310:EXPORT_SYMBOL(drm_ras_nl_error_event);\ndrivers/gpu/drm/drm_ras.c-311-\n--\ndrivers/gpu/drm/xe/xe_drm_ras.c=198=void xe_drm_ras_event(struct xe_device xe, u32 component, u32 severity, u32 value, gfp_t flags)\n--\ndrivers/gpu/drm/xe/xe_drm_ras.c-213-\ndrivers/gpu/drm/xe/xe_drm_ras.c:214:\tret = drm_ras_nl_error_event(node, component, info[component].name, value, flags);\ndrivers/gpu/drm/xe/xe_drm_ras.c-215-\tif (ret)\n--\ninclude/drm/drm_ras.h=82=void drm_ras_node_unregister(struct drm_ras_node node);\ninclude/drm/drm_ras.h:83:int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id, const char error_name,\ninclude/drm/drm_ras.h-84-\t\t\t u32 value, gfp_t flags);\n--\ninclude/drm/drm_ras.h=87=static inline void drm_ras_node_unregister(struct drm_ras_node node) { }\ninclude/drm/drm_ras.h:88:static inline int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id,\ninclude/drm/drm_ras.h-89-\t\t\t\t\t const char error_name, u32 value, gfp_t flags)\n" }
5/2	2026/07/01 15:53	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10282 output: 21 thoughts: 33 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: Investigating the `xe_drm_ras_event` Callers Alright, so the clue here is that the function in question, `xe_drm_ras_event`, is only called from one place. That's actually a pretty good starting point, saves me some time. My next step, naturally, is to pinpoint where `xe_drm_ras_event` is being invoked. Understanding the call stack is crucial for tracing the flow and understanding its purpose within the wider system. I need to track down the exact location of that single call to properly analyze what's going on.
6/2	2026/07/01 15:53	tool	grepper	0m Args: { "Expression": "xe_drm_ras_event" } Results: { "Output": "drivers/gpu/drm/xe/xe_drm_ras.c=157=static int register_nodes(struct xe_device xe)\n--\ndrivers/gpu/drm/xe/xe_drm_ras.c-188-/\ndrivers/gpu/drm/xe/xe_drm_ras.c:189: xe_drm_ras_event() - Report drm_ras error event to userspace\ndrivers/gpu/drm/xe/xe_drm_ras.c-190- * @xe: xe device structure\n--\ndrivers/gpu/drm/xe/xe_drm_ras.c-197- /\ndrivers/gpu/drm/xe/xe_drm_ras.c:198:void xe_drm_ras_event(struct xe_device xe, u32 component, u32 severity, u32 value, gfp_t flags)\ndrivers/gpu/drm/xe/xe_drm_ras.c-199-{\n--\ndrivers/gpu/drm/xe/xe_drm_ras.h=15=int xe_drm_ras_init(struct xe_device xe);\ndrivers/gpu/drm/xe/xe_drm_ras.h:16:void xe_drm_ras_event(struct xe_device xe, u32 component, u32 severity, u32 value, gfp_t flags);\ndrivers/gpu/drm/xe/xe_drm_ras.h-17-\n--\ndrivers/gpu/drm/xe/xe_hw_error.c=427=static void hw_error_source_handler(struct xe_tile tile, const enum hardware_error hw_err)\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-499-\t\tvalue = atomic_read(\u0026info[error_id].counter);\ndrivers/gpu/drm/xe/xe_hw_error.c:500:\t\txe_drm_ras_event(xe, error_id, severity, value, GFP_ATOMIC);\ndrivers/gpu/drm/xe/xe_hw_error.c-501-\t}\n--\ndrivers/gpu/drm/xe/xe_ras.c=164=static void ras_send_error_event(struct xe_device xe, u8 severity, u8 component)\n--\ndrivers/gpu/drm/xe/xe_ras.c-185-\ndrivers/gpu/drm/xe/xe_ras.c:186:\txe_drm_ras_event(xe, drm_component, drm_severity, value, GFP_KERNEL);\ndrivers/gpu/drm/xe/xe_ras.c-187-}\n" }
7/2	2026/07/01 15:53	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11125 output: 21 thoughts: 42 Thoughts: Okay, here's my take on those thoughts, framed from my perspective as a seasoned expert: Tracing the Error Signal Right, so this function, the one in question, is getting called from `hw_error_source_handler` and `ras_send_error_event`. That makes sense; it's likely a central point for dealing with hardware errors, either directly from the source itself or from the RAS (Reliability, Availability, and Serviceability) side of things. My immediate thought is, let's drill down and understand the flow of calls. I need to understand where `hw_error_source_handler` is being called from. It's the best way to get a broader picture. I need to find the root cause of these errors by understanding the source of the calls. Is it coming directly from an interrupt? Maybe a software-initiated check? Is this a high-priority interrupt handler? All of these questions are vital context.
8/2	2026/07/01 15:53	tool	grepper	0m Args: { "Expression": "hw_error_source_handler" } Results: { "Output": "drivers/gpu/drm/xe/xe_hw_error.c=370=static void soc_hw_error_handler(struct xe_tile tile, const enum hardware_error hw_err,\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-426-\ndrivers/gpu/drm/xe/xe_hw_error.c:427:static void hw_error_source_handler(struct xe_tile tile, const enum hardware_error hw_err)\ndrivers/gpu/drm/xe/xe_hw_error.c-428-{\n--\ndrivers/gpu/drm/xe/xe_hw_error.c=519=void xe_hw_error_irq_handler(struct xe_tile *tile, const u32 master_ctl)\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-527-\t\tif (master_ctl \u0026 ERROR_IRQ(hw_err))\ndrivers/gpu/drm/xe/xe_hw_error.c:528:\t\t\thw_error_source_handler(tile, hw_err);\ndrivers/gpu/drm/xe/xe_hw_error.c-529-\t}\n" }
9/2	2026/07/01 15:53	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11688 output: 21 thoughts: 35 Thoughts: Okay, here's my interpretation of those thoughts, framed as my own: Investigating the Error Handling Path Alright, I'm starting at `xe_hw_error_irq_handler`. That's where the initial trigger comes from. Now, I need to understand the downstream process. The logical next step is to trace where `ras_send_error_event` is invoked. Knowing the call stack from here is crucial for understanding the overall error reporting and handling strategy. I need to see where that function fits into the picture.
10/2	2026/07/01 15:53	tool	grepper	0m Args: { "Expression": "ras_send_error_event" } Results: { "Output": "drivers/gpu/drm/xe/xe_ras.c=156=static inline const char comp_to_str(u8 component)\n--\ndrivers/gpu/drm/xe/xe_ras.c-163-\ndrivers/gpu/drm/xe/xe_ras.c:164:static void ras_send_error_event(struct xe_device xe, u8 severity, u8 component)\ndrivers/gpu/drm/xe/xe_ras.c-165-{\n--\ndrivers/gpu/drm/xe/xe_ras.c=189=void xe_ras_counter_threshold_crossed(struct xe_device *xe,\n--\ndrivers/gpu/drm/xe/xe_ras.c-230-\ndrivers/gpu/drm/xe/xe_ras.c:231:\t\tras_send_error_event(xe, severity, component);\ndrivers/gpu/drm/xe/xe_ras.c-232-\t}\n" }
11/2	2026/07/01 15:53	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12105 output: 23 thoughts: 36 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Analyzing the Counter Threshold Cross Event Alright, so `xe_ras_counter_threshold_crossed` is the entry point. I need to understand the trigger. My first move is clear: I'm going to track down every call site for `xe_ras_counter_threshold_crossed`. Understanding the origin of this function call is critical for grasping the broader context of the event – I need to know what is monitoring what, and specifically why this threshold was crossed. Diving into the call graph is the best way to start mapping out the process flow and pinpointing the root cause of this alert. This is all about gathering the initial telemetry to form a hypothesis.
12/2	2026/07/01 15:53	tool	grepper	0m Args: { "Expression": "xe_ras_counter_threshold_crossed" } Results: { "Output": "drivers/gpu/drm/xe/xe_ras.c=164=static void ras_send_error_event(struct xe_device xe, u8 severity, u8 component)\n--\ndrivers/gpu/drm/xe/xe_ras.c-188-\ndrivers/gpu/drm/xe/xe_ras.c:189:void xe_ras_counter_threshold_crossed(struct xe_device xe,\ndrivers/gpu/drm/xe/xe_ras.c-190-\t\t\t\t struct xe_sysctrl_event_response response)\n--\ndrivers/gpu/drm/xe/xe_ras.h=12=struct xe_sysctrl_event_response;\ndrivers/gpu/drm/xe/xe_ras.h-13-\ndrivers/gpu/drm/xe/xe_ras.h:14:void xe_ras_counter_threshold_crossed(struct xe_device xe,\ndrivers/gpu/drm/xe/xe_ras.h-15-\t\t\t\t struct xe_sysctrl_event_response response);\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event.c=15=static void get_pending_event(struct xe_sysctrl sc, struct xe_sysctrl_mailbox_command *command)\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-38-\t\tif (response-\u003eevent == XE_SYSCTRL_EVENT_THRESHOLD_CROSSED)\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:39:\t\t\txe_ras_counter_threshold_crossed(xe, response);\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-40-\t\telse\n" }
13/2	2026/07/01 15:53	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12741 output: 19 thoughts: 39 Thoughts: Okay, here's my take on those thoughts, framed from my perspective: Debugging Xe System Control Events Right, I'm digging into this `xe_sysctrl_event.c` file again. Specifically, I'm trying to trace the path to this `get_pending_event` function. It seems to be the entry point of the issue I'm investigating. I need to understand where and how it's being called, so I can grasp the overall control flow and identify the root cause. Let's start by finding all the call sites to `get_pending_event` within the codebase. That's usually the best way to orient myself when debugging such a function.
14/2	2026/07/01 15:53	tool	grepper	0m Args: { "Expression": "get_pending_event" } Results: { "Output": "drivers/gpu/drm/xe/xe_sysctrl_event.c-14-\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:15:static void get_pending_event(struct xe_sysctrl sc, struct xe_sysctrl_mailbox_command command)\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-16-{\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event.c=70=void xe_sysctrl_event(struct xe_sysctrl sc)\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-86-\tguard(mutex)(\u0026sc-\u003eevent_lock);\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:87:\tget_pending_event(sc, \u0026command);\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-88-}\n--\ndrivers/net/ethernet/qlogic/qed/qed_sriov.c=3879=static void qed_iov_process_mbx_req(struct qed_hwfn p_hwfn,\n--\ndrivers/net/ethernet/qlogic/qed/qed_sriov.c-4003-\ndrivers/net/ethernet/qlogic/qed/qed_sriov.c:4004:static void qed_iov_pf_get_pending_events(struct qed_hwfn p_hwfn, u64 events)\ndrivers/net/ethernet/qlogic/qed/qed_sriov.c-4005-{\n--\ndrivers/net/ethernet/qlogic/qed/qed_sriov.c=4932=static void qed_handle_vf_msg(struct qed_hwfn *hwfn)\n--\ndrivers/net/ethernet/qlogic/qed/qed_sriov.c-4945-\ndrivers/net/ethernet/qlogic/qed/qed_sriov.c:4946:\tqed_iov_pf_get_pending_events(hwfn, events);\ndrivers/net/ethernet/qlogic/qed/qed_sriov.c-4947-\n" }
15/2	2026/07/01 15:53	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13491 output: 20 thoughts: 33 Thoughts: Here's my take on the thought process: Diving into the `xe_sysctrl_event` Function Okay, so I'm looking at `xe_sysctrl_event` and it looks like it's the gateway for system control events. The function call tree suggests it initiates a call to `get_pending_event`. That makes sense; it's probably grabbing the next control action that needs to be processed. My next step here is definitely to understand the calling contexts of `xe_sysctrl_event`. I need to figure out where this function is being invoked from. Knowing the entry points will give me the necessary context to truly understand its purpose, potential bottlenecks, and any dependencies it might have. This should highlight the event source and the broader functionality affected by the event.
16/2	2026/07/01 15:53	tool	grepper	0m Args: { "Expression": "xe_sysctrl_event" } Results: { "Output": "drivers/gpu/drm/xe/Makefile=35=xe-y += xe_bb.o \\\n--\ndrivers/gpu/drm/xe/Makefile-128-\txe_sysctrl.o \\\ndrivers/gpu/drm/xe/Makefile:129:\txe_sysctrl_event.o \\\ndrivers/gpu/drm/xe/Makefile-130-\txe_sysctrl_mailbox.o \\\n--\ndrivers/gpu/drm/xe/xe_ras.c-12-#include \"xe_sysctrl.h\"\ndrivers/gpu/drm/xe/xe_ras.c:13:#include \"xe_sysctrl_event_types.h\"\ndrivers/gpu/drm/xe/xe_ras.c-14-#include \"xe_sysctrl_mailbox.h\"\n--\ndrivers/gpu/drm/xe/xe_ras.c=189=void xe_ras_counter_threshold_crossed(struct xe_device xe,\ndrivers/gpu/drm/xe/xe_ras.c:190:\t\t\t\t struct xe_sysctrl_event_response response)\ndrivers/gpu/drm/xe/xe_ras.c-191-{\n--\ndrivers/gpu/drm/xe/xe_ras.h=11=struct xe_device;\ndrivers/gpu/drm/xe/xe_ras.h:12:struct xe_sysctrl_event_response;\ndrivers/gpu/drm/xe/xe_ras.h-13-\ndrivers/gpu/drm/xe/xe_ras.h=14=void xe_ras_counter_threshold_crossed(struct xe_device xe,\ndrivers/gpu/drm/xe/xe_ras.h:15:\t\t\t\t struct xe_sysctrl_event_response response);\ndrivers/gpu/drm/xe/xe_ras.h-16-int xe_ras_get_counter(struct xe_device xe, u8 severity, u8 component, u32 value);\n--\ndrivers/gpu/drm/xe/xe_sysctrl.c=41=static void xe_sysctrl_work(struct work_struct work)\n--\ndrivers/gpu/drm/xe/xe_sysctrl.c-46-\tguard(xe_pm_runtime)(xe);\ndrivers/gpu/drm/xe/xe_sysctrl.c:47:\txe_sysctrl_event(sc);\ndrivers/gpu/drm/xe/xe_sysctrl.c-48-}\n--\ndrivers/gpu/drm/xe/xe_sysctrl.h=14=static inline struct xe_device sc_to_xe(struct xe_sysctrl sc)\n--\ndrivers/gpu/drm/xe/xe_sysctrl.h-18-\ndrivers/gpu/drm/xe/xe_sysctrl.h:19:void xe_sysctrl_event(struct xe_sysctrl sc);\ndrivers/gpu/drm/xe/xe_sysctrl.h-20-int xe_sysctrl_init(struct xe_device xe);\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-10-#include \"xe_sysctrl.h\"\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:11:#include \"xe_sysctrl_event_types.h\"\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-12-#include \"xe_sysctrl_mailbox.h\"\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event.c=15=static void get_pending_event(struct xe_sysctrl sc, struct xe_sysctrl_mailbox_command command)\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-16-{\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:17:\tstruct xe_sysctrl_event_response response = command-\u003edata_out;\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-18-\tstruct xe_device xe = sc_to_xe(sc);\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event.c=52=static void event_request_prepare(struct xe_device xe, struct xe_sysctrl_app_msg_hdr header,\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:53:\t\t\t\t struct xe_sysctrl_event_request request)\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-54-{\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-64-/*\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:65: xe_sysctrl_event() - Handler for System Controller events\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-66- * @sc: System Controller instance\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-69- /\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:70:void xe_sysctrl_event(struct xe_sysctrl sc)\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-71-{\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-72-\tstruct xe_sysctrl_mailbox_command command = {};\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:73:\tstruct xe_sysctrl_event_response response = {};\ndrivers/gpu/drm/xe/xe_sysctrl_event.c:74:\tstruct xe_sysctrl_event_request request = {};\ndrivers/gpu/drm/xe/xe_sysctrl_event.c-75-\tstruct xe_sysctrl_app_msg_hdr header = {};\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-16-/*\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h:17: enum xe_sysctrl_event - Events reported by System Controller\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-18- \n--\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-20- /\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h:21:enum xe_sysctrl_event {\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-22-\tXE_SYSCTRL_EVENT_THRESHOLD_CROSSED\t= 0x01,\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-25-/*\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h:26: struct xe_sysctrl_event_request - Request structure for pending event\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-27- /\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h:28:struct xe_sysctrl_event_request {\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-29-\t/* @vector: MSI-X vector that was triggered /\n--\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-39-/\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h:40: struct xe_sysctrl_event_response - Response structure for pending event\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-41- /\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h:42:struct xe_sysctrl_event_response {\ndrivers/gpu/drm/xe/xe_sysctrl_event_types.h-43-\t/* @count: Pending event count after this response */\n" }
17/2	2026/07/01 15:53	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15606 output: 21 thoughts: 359 Thoughts: Analyzing the `xe_sysctrl_event` Pathway for Fuzzing Potential Okay, let's break this down. `xe_sysctrl_event` is called from `xe_sysctrl_work`, which is a workqueue item. That work is initiated by the System Controller hardware. The question is, can syzkaller actually reach this point? Syzkaller can generate netlink messages, but in this scenario, the netlink message (the end goal here) is sent by the kernel itself, as a response to a hardware event. So, can syzkaller directly trigger the underlying hardware event? Probably not; usually, it doesn't have that level of control unless it's dealing with a virtual device or can somehow inject the event. My primary focus shifts to finding alternate paths. Are there other ways to trigger `drm_ras_nl_error_event`? Hmm, no, it's pretty locked down. It's only called from `xe_drm_ras_event`, which is then called by `hw_error_source_handler` and `ras_send_error_event`. These are both hardware error handlers – which means they're responding to specific hardware errors. So, the new code path boils down to: 1. `drm_ras_nl_error_event`: constructs and broadcasts a netlink message. 2. `xe_drm_ras_event`: calls `drm_ras_nl_error_event`. 3. `ras_send_error_event`: calls `xe_drm_ras_event`. 4. `hw_error_source_handler`: also calls `xe_drm_ras_event`. 5. There's also netlink multicast group registration. The real question is, is this worth fuzzing? If syzkaller can't trigger the hardware errors directly, then we're never going to hit `drm_ras_nl_error_event`. That makes it a dead end for fuzzing unless we can somehow force or inject the error conditions. Wait a second...is there any kind of debugfs interface, or anything like that, in the `xe` subsystem that might let me inject these kinds of errors? That would change everything. Time to check for error injection methods.
18/2	2026/07/01 15:54	tool	grepper	0m Args: { "Expression": "hw_error_source_handler" } Results: { "Output": "drivers/gpu/drm/xe/xe_hw_error.c=370=static void soc_hw_error_handler(struct xe_tile tile, const enum hardware_error hw_err,\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-426-\ndrivers/gpu/drm/xe/xe_hw_error.c:427:static void hw_error_source_handler(struct xe_tile tile, const enum hardware_error hw_err)\ndrivers/gpu/drm/xe/xe_hw_error.c-428-{\n--\ndrivers/gpu/drm/xe/xe_hw_error.c=519=void xe_hw_error_irq_handler(struct xe_tile *tile, const u32 master_ctl)\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-527-\t\tif (master_ctl \u0026 ERROR_IRQ(hw_err))\ndrivers/gpu/drm/xe/xe_hw_error.c:528:\t\t\thw_error_source_handler(tile, hw_err);\ndrivers/gpu/drm/xe/xe_hw_error.c-529-\t}\n" }
19/2	2026/07/01 15:54	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 16775 output: 29 thoughts: 11 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Analyzing Potential Injection Vectors Alright, let's dive in. My immediate focus is on identifying any potential injection mechanisms. I need to systematically probe the system for vulnerabilities where untrusted input could be injected and executed or interpreted in an unintended manner. This means looking beyond the obvious and considering all potential entry points, including but not limited to: user input fields, API calls, data imports, configuration files, and even seemingly benign interactions. I'll need to think critically about how different components interact with each other and where data might be passed, transformed, and ultimately utilized. My experience tells me not to leave any stone unturned; the most subtle vulnerabilities are often the most overlooked. I have to think like an attacker.
20/2	2026/07/01 15:54	tool	grepper	0m Args: { "Expression": "inject", "PathPrefix": "drivers/gpu/drm/xe/" } Results: { "Output": "drivers/gpu/drm/xe/xe_debugfs.c-8-#include \u003clinux/debugfs.h\u003e\ndrivers/gpu/drm/xe/xe_debugfs.c:9:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_debugfs.c-10-#include \u003clinux/string_helpers.h\u003e\n--\ndrivers/gpu/drm/xe/xe_debugfs.c=41=DECLARE_FAULT_ATTR(gt_reset_failure);\ndrivers/gpu/drm/xe/xe_debugfs.c:42:DECLARE_FAULT_ATTR(inject_csc_hw_error);\ndrivers/gpu/drm/xe/xe_debugfs.c-43-\n--\ndrivers/gpu/drm/xe/xe_debugfs.c=547=void xe_debugfs_register(struct xe_device xe)\n--\ndrivers/gpu/drm/xe/xe_debugfs.c-565-\t\t\t\t\t root, minor);\ndrivers/gpu/drm/xe/xe_debugfs.c:566:\t\tfault_create_debugfs_attr(\"inject_csc_hw_error\", root,\ndrivers/gpu/drm/xe/xe_debugfs.c:567:\t\t\t\t\t \u0026inject_csc_hw_error);\ndrivers/gpu/drm/xe/xe_debugfs.c-568-\t}\n--\ndrivers/gpu/drm/xe/xe_device.c-9-#include \u003clinux/delay.h\u003e\ndrivers/gpu/drm/xe/xe_device.c:10:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_device.c-11-#include \u003clinux/units.h\u003e\n--\ndrivers/gpu/drm/xe/xe_device.h=206=void xe_file_put(struct xe_file xef);\ndrivers/gpu/drm/xe/xe_device.h-207-\ndrivers/gpu/drm/xe/xe_device.h:208:int xe_is_injection_active(void);\ndrivers/gpu/drm/xe/xe_device.h-209-\n--\ndrivers/gpu/drm/xe/xe_device_types.h=90=struct xe_device {\n--\ndrivers/gpu/drm/xe/xe_device_types.h-530-\t/*\ndrivers/gpu/drm/xe/xe_device_types.h:531:\t @vm_inject_error_position: inject errors at different places in VM\ndrivers/gpu/drm/xe/xe_device_types.h-532-\t * bind IOCTL based on this value\ndrivers/gpu/drm/xe/xe_device_types.h-533-\t /\ndrivers/gpu/drm/xe/xe_device_types.h:534:\tu8 vm_inject_error_position;\ndrivers/gpu/drm/xe/xe_device_types.h-535-#endif\n--\ndrivers/gpu/drm/xe/xe_ggtt.c-8-#include \u003ckunit/visibility.h\u003e\ndrivers/gpu/drm/xe/xe_ggtt.c:9:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_ggtt.c-10-#include \u003clinux/io-64-nonatomic-lo-hi.h\u003e\n--\ndrivers/gpu/drm/xe/xe_gt.c=911=static void gt_reset_worker(struct work_struct w)\n--\ndrivers/gpu/drm/xe/xe_gt.c-925-\ndrivers/gpu/drm/xe/xe_gt.c:926:\tif (xe_fault_inject_gt_reset()) {\ndrivers/gpu/drm/xe/xe_gt.c-927-\t\terr = -ECANCELED;\n--\ndrivers/gpu/drm/xe/xe_gt.c=978=void xe_gt_reset_async(struct xe_gt gt)\n--\ndrivers/gpu/drm/xe/xe_gt.c-982-\t/ Don't do a reset while one is already in flight /\ndrivers/gpu/drm/xe/xe_gt.c:983:\tif (!xe_fault_inject_gt_reset() \u0026\u0026 xe_uc_reset_prepare(\u0026gt-\u003euc))\ndrivers/gpu/drm/xe/xe_gt.c-984-\t\treturn;\n--\ndrivers/gpu/drm/xe/xe_gt.h-8-\ndrivers/gpu/drm/xe/xe_gt.h:9:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_gt.h-10-\n--\ndrivers/gpu/drm/xe/xe_gt.h=41=extern struct fault_attr gt_reset_failure;\ndrivers/gpu/drm/xe/xe_gt.h:42:static inline bool xe_fault_inject_gt_reset(void)\ndrivers/gpu/drm/xe/xe_gt.h-43-{\n--\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c=45=enum VF_MIGRATION_WAIT_POINTS {\n--\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c-52-#define VF_MIGRATION_WAIT_DELAY_IN_MS\t1000\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c:53:static void vf_post_migration_inject_wait(struct xe_gt gt,\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c-54-\t\t\t\t\t enum VF_MIGRATION_WAIT_POINTS wait)\n--\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c-57-\t\txe_gt_dbg(gt,\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c:58:\t\t\t \"TESTING injecting %u ms delay due to resfix_stoppers=%#x, to continue clear %#x\\n\",\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c-59-\t\t\t VF_MIGRATION_WAIT_DELAY_IN_MS,\n--\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c-67-\tstruct xe_gt __gt = (gt);\t\t\t\t\t\t\\\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c:68:\tvf_post_migration_inject_wait(__gt, VF_MIGRATION_WAIT_##_POS);\t\t\\\ndrivers/gpu/drm/xe/xe_gt_sriov_vf.c-69-\t})\n--\ndrivers/gpu/drm/xe/xe_guc_ads.c-7-\ndrivers/gpu/drm/xe/xe_guc_ads.c:8:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_guc_ads.c-9-\n--\ndrivers/gpu/drm/xe/xe_guc_ct.c-10-#include \u003clinux/delay.h\u003e\ndrivers/gpu/drm/xe/xe_guc_ct.c:11:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_guc_ct.c-12-\n--\ndrivers/gpu/drm/xe/xe_guc_ct.c=2150=void xe_guc_ct_print(struct xe_guc_ct ct, struct drm_printer p, bool want_ctb)\n--\ndrivers/gpu/drm/xe/xe_guc_ct.c-2163- This is a helper function which assists the driver in identifying if a fault\ndrivers/gpu/drm/xe/xe_guc_ct.c:2164: * injection test is currently active, allowing it to reduce unnecessary debug\ndrivers/gpu/drm/xe/xe_guc_ct.c:2165: * output. Typically, the function returns zero, but the fault injection\ndrivers/gpu/drm/xe/xe_guc_ct.c:2166: * framework can alter this to return an error. Since faults are injected\ndrivers/gpu/drm/xe/xe_guc_ct.c-2167- * through this function, it's important to ensure the compiler doesn't optimize\n--\ndrivers/gpu/drm/xe/xe_guc_ct.c-2171- /\ndrivers/gpu/drm/xe/xe_guc_ct.c:2172:noinline int xe_is_injection_active(void) { return 0; }\ndrivers/gpu/drm/xe/xe_guc_ct.c:2173:ALLOW_ERROR_INJECTION(xe_is_injection_active, ERRNO);\ndrivers/gpu/drm/xe/xe_guc_ct.c-2174-#else\ndrivers/gpu/drm/xe/xe_guc_ct.c:2175:int xe_is_injection_active(void) { return 0; }\ndrivers/gpu/drm/xe/xe_guc_ct.c-2176-#endif\n--\ndrivers/gpu/drm/xe/xe_guc_ct.c=2178=static void ct_dead_capture(struct xe_guc_ct ct, struct guc_ctb ctb, u32 reason_code)\n--\ndrivers/gpu/drm/xe/xe_guc_ct.c-2188-\t/\ndrivers/gpu/drm/xe/xe_guc_ct.c:2189:\t * Huge dump is getting generated when injecting error for guc CT/MMIO\ndrivers/gpu/drm/xe/xe_guc_ct.c:2190:\t * functions. So, let us suppress the dump when fault is injected.\ndrivers/gpu/drm/xe/xe_guc_ct.c-2191-\t /\ndrivers/gpu/drm/xe/xe_guc_ct.c:2192:\tif (xe_is_injection_active())\ndrivers/gpu/drm/xe/xe_guc_ct.c-2193-\t\treturn;\n--\ndrivers/gpu/drm/xe/xe_guc_log.c-7-\ndrivers/gpu/drm/xe/xe_guc_log.c:8:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_guc_log.c-9-\n--\ndrivers/gpu/drm/xe/xe_guc_relay.c-7-#include \u003clinux/delay.h\u003e\ndrivers/gpu/drm/xe/xe_guc_relay.c:8:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_guc_relay.c-9-\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-6-#include \u003clinux/bitmap.h\u003e\ndrivers/gpu/drm/xe/xe_hw_error.c:7:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_hw_error.c-8-\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-27-\ndrivers/gpu/drm/xe/xe_hw_error.c:28:extern struct fault_attr inject_csc_hw_error;\ndrivers/gpu/drm/xe/xe_hw_error.c-29-\n--\ndrivers/gpu/drm/xe/xe_hw_error.c=164=static_assert(ARRAY_SIZE(pvc_master_local_nonfatal_err_reg) == XE_RAS_REG_SIZE);\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-169-\ndrivers/gpu/drm/xe/xe_hw_error.c:170:static bool fault_inject_csc_hw_error(void)\ndrivers/gpu/drm/xe/xe_hw_error.c-171-{\ndrivers/gpu/drm/xe/xe_hw_error.c:172:\treturn IS_ENABLED(CONFIG_DEBUG_FS) \u0026\u0026 should_fail(\u0026inject_csc_hw_error, 1);\ndrivers/gpu/drm/xe/xe_hw_error.c-173-}\n--\ndrivers/gpu/drm/xe/xe_hw_error.c=519=void xe_hw_error_irq_handler(struct xe_tile tile, const u32 master_ctl)\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-522-\ndrivers/gpu/drm/xe/xe_hw_error.c:523:\tif (fault_inject_csc_hw_error())\ndrivers/gpu/drm/xe/xe_hw_error.c-524-\t\tschedule_work(\u0026tile-\u003ecsc_hw_error_work);\n--\ndrivers/gpu/drm/xe/xe_pci.c=1043=static void xe_pci_remove(struct pci_dev pdev)\n--\ndrivers/gpu/drm/xe/xe_pci.c-1059- \ndrivers/gpu/drm/xe/xe_pci.c:1060: * Fault injection is used to test the error paths of some initialization\ndrivers/gpu/drm/xe/xe_pci.c-1061- * functions called either directly from xe_pci_probe() or indirectly for\ndrivers/gpu/drm/xe/xe_pci.c-1062- * example through xe_device_probe(). Those functions use the kernel fault\ndrivers/gpu/drm/xe/xe_pci.c:1063: * injection capabilities infrastructure, see\ndrivers/gpu/drm/xe/xe_pci.c:1064: * Documentation/fault-injection/fault-injection.rst for details. The macro\ndrivers/gpu/drm/xe/xe_pci.c-1065- * ALLOW_ERROR_INJECTION() is used to conditionally skip function execution\ndrivers/gpu/drm/xe/xe_pci.c-1066- * at runtime and use a provided return value. The first requirement for\ndrivers/gpu/drm/xe/xe_pci.c:1067: * error injectable functions is proper handling of the error code by the\ndrivers/gpu/drm/xe/xe_pci.c-1068- * caller for recovery, which is always the case here. The second\n--\ndrivers/gpu/drm/xe/xe_pci.c-1073- * caller. Therefore there is no consequence on those specific callers when\ndrivers/gpu/drm/xe/xe_pci.c:1074: * function error injection skips the whole function.\ndrivers/gpu/drm/xe/xe_pci.c-1075- /\n--\ndrivers/gpu/drm/xe/xe_pcode.c-9-#include \u003clinux/errno.h\u003e\ndrivers/gpu/drm/xe/xe_pcode.c:10:#include \u003clinux/error-injection.h\u003e\ndrivers/gpu/drm/xe/xe_pcode.c-11-\n--\ndrivers/gpu/drm/xe/xe_pm.c-7-\ndrivers/gpu/drm/xe/xe_pm.c:8:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_pm.c-9-#include \u003clinux/pm_runtime.h\u003e\n--\ndrivers/gpu/drm/xe/xe_pt.c=1078=static void xe_pt_commit_locks_assert(struct xe_vma vma)\n--\ndrivers/gpu/drm/xe/xe_pt.c-1088-\tif (xe_vma_is_userptr(vma))\ndrivers/gpu/drm/xe/xe_pt.c:1089:\t\txe_svm_assert_held_read_or_inject_write(vm);\ndrivers/gpu/drm/xe/xe_pt.c-1090-}\n--\ndrivers/gpu/drm/xe/xe_pt.c=1396=static int xe_pt_pre_commit(struct xe_migrate_pt_update pt_update)\n--\ndrivers/gpu/drm/xe/xe_pt.c-1412- default; write mode when CONFIG_DRM_XE_USERPTR_INVAL_INJECT is on,\ndrivers/gpu/drm/xe/xe_pt.c:1413: * because a userptr op in this critical section may invoke the injected\ndrivers/gpu/drm/xe/xe_pt.c-1414- * xe_vma_userptr_force_invalidate() path that calls\n--\ndrivers/gpu/drm/xe/xe_pt.c=1427=static void xe_pt_svm_userptr_notifier_unlock(struct xe_vm vm)\n--\ndrivers/gpu/drm/xe/xe_pt.c-1438-\ndrivers/gpu/drm/xe/xe_pt.c:1439:static bool xe_pt_userptr_inject_eagain(struct xe_userptr_vma uvma)\ndrivers/gpu/drm/xe/xe_pt.c-1440-{\n--\ndrivers/gpu/drm/xe/xe_pt.c-1453-\ndrivers/gpu/drm/xe/xe_pt.c:1454:static bool xe_pt_userptr_inject_eagain(struct xe_userptr_vma uvma)\ndrivers/gpu/drm/xe/xe_pt.c-1455-{\n--\ndrivers/gpu/drm/xe/xe_pt.c=1461=static int vma_check_userptr(struct xe_vm vm, struct xe_vma vma,\n--\ndrivers/gpu/drm/xe/xe_pt.c-1466-\ndrivers/gpu/drm/xe/xe_pt.c:1467:\txe_svm_assert_held_read_or_inject_write(vm);\ndrivers/gpu/drm/xe/xe_pt.c-1468-\n--\ndrivers/gpu/drm/xe/xe_pt.c-1472-\tuvma = to_userptr_vma(vma);\ndrivers/gpu/drm/xe/xe_pt.c:1473:\tif (xe_pt_userptr_inject_eagain(uvma))\ndrivers/gpu/drm/xe/xe_pt.c-1474-\t\txe_vma_userptr_force_invalidate(uvma);\n--\ndrivers/gpu/drm/xe/xe_pt.c=1492=static int op_check_svm_userptr(struct xe_vm vm, struct xe_vma_op op,\n--\ndrivers/gpu/drm/xe/xe_pt.c-1496-\ndrivers/gpu/drm/xe/xe_pt.c:1497:\txe_svm_assert_held_read_or_inject_write(vm);\ndrivers/gpu/drm/xe/xe_pt.c-1498-\n--\ndrivers/gpu/drm/xe/xe_pt.c=2373=int xe_pt_update_ops_prepare(struct xe_tile tile, struct xe_vma_ops vops)\n--\ndrivers/gpu/drm/xe/xe_pt.c-2401-#ifdef TEST_VM_OPS_ERROR\ndrivers/gpu/drm/xe/xe_pt.c:2402:\tif (vops-\u003einject_error \u0026\u0026\ndrivers/gpu/drm/xe/xe_pt.c:2403:\t vops-\u003evm-\u003exe-\u003evm_inject_error_position == FORCE_OP_ERROR_PREPARE)\ndrivers/gpu/drm/xe/xe_pt.c-2404-\t\treturn -ENOSPC;\n--\ndrivers/gpu/drm/xe/xe_pt.c=2411=static void bind_op_commit(struct xe_vm vm, struct xe_tile tile,\n--\ndrivers/gpu/drm/xe/xe_pt.c-2438-\tif (xe_vma_is_userptr(vma)) {\ndrivers/gpu/drm/xe/xe_pt.c:2439:\t\txe_svm_assert_held_read_or_inject_write(vm);\ndrivers/gpu/drm/xe/xe_pt.c-2440-\t\tto_userptr_vma(vma)-\u003euserptr.initial_bind = true;\n--\ndrivers/gpu/drm/xe/xe_pt.c=2453=static void unbind_op_commit(struct xe_vm vm, struct xe_tile tile,\n--\ndrivers/gpu/drm/xe/xe_pt.c-2474-\t\tif (xe_vma_is_userptr(vma)) {\ndrivers/gpu/drm/xe/xe_pt.c:2475:\t\t\txe_svm_assert_held_read_or_inject_write(vm);\ndrivers/gpu/drm/xe/xe_pt.c-2476-\n--\ndrivers/gpu/drm/xe/xe_pt.c=2609=xe_pt_update_ops_run(struct xe_tile tile, struct xe_vma_ops vops)\n--\ndrivers/gpu/drm/xe/xe_pt.c-2637-#ifdef TEST_VM_OPS_ERROR\ndrivers/gpu/drm/xe/xe_pt.c:2638:\tif (vops-\u003einject_error \u0026\u0026\ndrivers/gpu/drm/xe/xe_pt.c:2639:\t vm-\u003exe-\u003evm_inject_error_position == FORCE_OP_ERROR_RUN)\ndrivers/gpu/drm/xe/xe_pt.c-2640-\t\treturn ERR_PTR(-ENOSPC);\n--\ndrivers/gpu/drm/xe/xe_sriov.c-5-\ndrivers/gpu/drm/xe/xe_sriov.c:6:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_sriov.c-7-\n--\ndrivers/gpu/drm/xe/xe_svm.h=385=static inline struct drm_pagemap xe_drm_pagemap_from_fd(int fd, u32 region_instance)\n--\ndrivers/gpu/drm/xe/xe_svm.h-403-#if IS_ENABLED(CONFIG_DRM_XE_USERPTR_INVAL_INJECT)\ndrivers/gpu/drm/xe/xe_svm.h:404:#define xe_svm_assert_held_read_or_inject_write(vm__) \\\ndrivers/gpu/drm/xe/xe_svm.h-405-\tlockdep_assert_held_write(\u0026(vm__)-\u003esvm.gpusvm.notifier_lock)\ndrivers/gpu/drm/xe/xe_svm.h-406-#else\ndrivers/gpu/drm/xe/xe_svm.h:407:#define xe_svm_assert_held_read_or_inject_write(vm__) \\\ndrivers/gpu/drm/xe/xe_svm.h-408-\tlockdep_assert_held_read(\u0026(vm__)-\u003esvm.gpusvm.notifier_lock)\n--\ndrivers/gpu/drm/xe/xe_svm.h-422-\ndrivers/gpu/drm/xe/xe_svm.h:423:static inline void xe_svm_assert_held_read_or_inject_write(struct xe_vm vm)\ndrivers/gpu/drm/xe/xe_svm.h-424-{\n--\ndrivers/gpu/drm/xe/xe_tile.c-5-\ndrivers/gpu/drm/xe/xe_tile.c:6:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_tile.c-7-\n--\ndrivers/gpu/drm/xe/xe_uc_fw.c-6-#include \u003clinux/bitfield.h\u003e\ndrivers/gpu/drm/xe/xe_uc_fw.c:7:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_uc_fw.c-8-#include \u003clinux/firmware.h\u003e\n--\ndrivers/gpu/drm/xe/xe_validation.c=125=int xe_validation_ctx_init(struct xe_validation_ctx ctx, struct xe_validation_device val,\n--\ndrivers/gpu/drm/xe/xe_validation.c-164- /\ndrivers/gpu/drm/xe/xe_validation.c:165:static bool xe_validation_contention_injected(struct drm_exec exec)\ndrivers/gpu/drm/xe/xe_validation.c-166-{\n--\ndrivers/gpu/drm/xe/xe_validation.c-171-\ndrivers/gpu/drm/xe/xe_validation.c:172:static bool xe_validation_contention_injected(struct drm_exec exec)\ndrivers/gpu/drm/xe/xe_validation.c-173-{\n--\ndrivers/gpu/drm/xe/xe_validation.c=179=static bool __xe_validation_should_retry(struct xe_validation_ctx ctx, int ret)\n--\ndrivers/gpu/drm/xe/xe_validation.c-182-\t ((ctx-\u003erequest_exclusive \u0026\u0026\ndrivers/gpu/drm/xe/xe_validation.c:183:\t xe_validation_contention_injected(ctx-\u003eexec)) \|\|\ndrivers/gpu/drm/xe/xe_validation.c-184-\t !ctx-\u003erequest_exclusive)) {\n--\ndrivers/gpu/drm/xe/xe_vm.c=3291=static int vm_bind_ioctl_ops_lock_and_prep(struct drm_exec exec,\n--\ndrivers/gpu/drm/xe/xe_vm.c-3308-#ifdef TEST_VM_OPS_ERROR\ndrivers/gpu/drm/xe/xe_vm.c:3309:\tif (vops-\u003einject_error \u0026\u0026\ndrivers/gpu/drm/xe/xe_vm.c:3310:\t vm-\u003exe-\u003evm_inject_error_position == FORCE_OP_ERROR_LOCK)\ndrivers/gpu/drm/xe/xe_vm.c-3311-\t\treturn -ENOSPC;\n--\ndrivers/gpu/drm/xe/xe_vm.c=3853=int xe_vm_bind_ioctl(struct drm_device dev, void data, struct drm_file file)\n--\ndrivers/gpu/drm/xe/xe_vm.c-4026-\t\tif (flags \u0026 FORCE_OP_ERROR) {\ndrivers/gpu/drm/xe/xe_vm.c:4027:\t\t\tvops.inject_error = true;\ndrivers/gpu/drm/xe/xe_vm.c:4028:\t\t\tvm-\u003exe-\u003evm_inject_error_position =\ndrivers/gpu/drm/xe/xe_vm.c:4029:\t\t\t\t(vm-\u003exe-\u003evm_inject_error_position + 1) %\ndrivers/gpu/drm/xe/xe_vm.c-4030-\t\t\t\tFORCE_OP_ERROR_COUNT;\n--\ndrivers/gpu/drm/xe/xe_vm_types.h=530=struct xe_vma_ops {\n--\ndrivers/gpu/drm/xe/xe_vm_types.h-550-#ifdef TEST_VM_OPS_ERROR\ndrivers/gpu/drm/xe/xe_vm_types.h:551:\t/* @inject_error: inject error to test error handling */\ndrivers/gpu/drm/xe/xe_vm_types.h:552:\tbool inject_error;\ndrivers/gpu/drm/xe/xe_vm_types.h-553-#endif\n--\ndrivers/gpu/drm/xe/xe_wa.c-10-#include \u003clinux/compiler_types.h\u003e\ndrivers/gpu/drm/xe/xe_wa.c:11:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_wa.c-12-\n--\ndrivers/gpu/drm/xe/xe_wopcm.c-7-\ndrivers/gpu/drm/xe/xe_wopcm.c:8:#include \u003clinux/fault-inject.h\u003e\ndrivers/gpu/drm/xe/xe_wopcm.c-9-\n" }
21/2	2026/07/01 15:54	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 23889 output: 21 thoughts: 48 Thoughts: Okay, let's break this down. Investigating the CSC Hardware Error Handling Alright, so I've stumbled upon `fault_inject_csc_hw_error`. It seems this function is responsible for triggering something related to a CSC hardware error. Specifically, it's scheduling a work item: `schedule_work(&tile->csc_hw_error_work);`. My immediate next step, obviously, is to understand what that work item, `csc_hw_error_work`, actually does. It's the key to understanding the full error handling flow here. I'll need to dive into the definition of that work function and see how it reacts to, and deals with, the presumed hardware fault. Let's see what we can find!
22/2	2026/07/01 15:54	tool	grepper	0m Args: { "Expression": "csc_hw_error_work" } Results: { "Output": "drivers/gpu/drm/xe/xe_hw_error.c=170=static bool fault_inject_csc_hw_error(void)\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-174-\ndrivers/gpu/drm/xe/xe_hw_error.c:175:static void csc_hw_error_work(struct work_struct work)\ndrivers/gpu/drm/xe/xe_hw_error.c-176-{\ndrivers/gpu/drm/xe/xe_hw_error.c:177:\tstruct xe_tile tile = container_of(work, typeof(tile), csc_hw_error_work);\ndrivers/gpu/drm/xe/xe_hw_error.c-178-\tstruct xe_device xe = tile_to_xe(tile);\n--\ndrivers/gpu/drm/xe/xe_hw_error.c=183=static void csc_hw_error_handler(struct xe_tile tile, const enum hardware_error hw_err)\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-211-\ndrivers/gpu/drm/xe/xe_hw_error.c:212:\t\t\tschedule_work(\u0026tile-\u003ecsc_hw_error_work);\ndrivers/gpu/drm/xe/xe_hw_error.c-213-\t\t}\n--\ndrivers/gpu/drm/xe/xe_hw_error.c=519=void xe_hw_error_irq_handler(struct xe_tile tile, const u32 master_ctl)\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-523-\tif (fault_inject_csc_hw_error())\ndrivers/gpu/drm/xe/xe_hw_error.c:524:\t\tschedule_work(\u0026tile-\u003ecsc_hw_error_work);\ndrivers/gpu/drm/xe/xe_hw_error.c-525-\n--\ndrivers/gpu/drm/xe/xe_hw_error.c=555=void xe_hw_error_init(struct xe_device xe)\n--\ndrivers/gpu/drm/xe/xe_hw_error.c-561-\ndrivers/gpu/drm/xe/xe_hw_error.c:562:\tINIT_WORK(\u0026tile-\u003ecsc_hw_error_work, csc_hw_error_work);\ndrivers/gpu/drm/xe/xe_hw_error.c-563-\n--\ndrivers/gpu/drm/xe/xe_tile_types.h=37=struct xe_tile {\n--\ndrivers/gpu/drm/xe/xe_tile_types.h-116-\ndrivers/gpu/drm/xe/xe_tile_types.h:117:\t/* @csc_hw_error_work: worker to report CSC HW errors */\ndrivers/gpu/drm/xe/xe_tile_types.h:118:\tstruct work_struct csc_hw_error_work;\ndrivers/gpu/drm/xe/xe_tile_types.h-119-\n" }
23/2	2026/07/01 15:54	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24884 output: 43 thoughts: 113 Thoughts: Here's my analysis of this code snippet: Debugging CSC Hardware Error Handling Okay, so I'm trying to trace the path of a CSC (presumably Color Space Conversion) hardware error. My initial thought is that `csc_hw_error_work` is likely calling some error handler function, maybe something like `csc_hw_error_handler`. I need to confirm this. Alright, let's see, it looks like `csc_hw_error_work` is actually defined as a static function: ```c static void csc_hw_error_work(struct work_struct work) { struct xe_tile tile = container_of(work, typeof(*tile), csc_hw_error_work); ... ``` Okay, so it takes a `work_struct` as input, and it looks like it gets a `xe_tile` structure from it using `container_of`. This suggests it's likely part of a deferred work queue related to a specific tile on the hardware. It's not a direct call, it is probably a registered task with the kernel. Now I need to delve into the full implementation of `csc_hw_error_work` to understand what actions are taken when this error occurs. I will have to find out where the `work_struct` is queued/scheduled, and what that call path does. I'll need to know whether any error handling is involved in the work's body.
24/2	2026/07/01 15:54	tool	read-file	0m Args: { "File": "drivers/gpu/drm/xe/xe_hw_error.c", "FirstLine": 170, "LineCount": 20 } Results: { "Contents": " 170:\tstatic bool fault_inject_csc_hw_error(void)\n 171:\t{\n 172:\t\treturn IS_ENABLED(CONFIG_DEBUG_FS) \u0026\u0026 should_fail(\u0026inject_csc_hw_error, 1);\n 173:\t}\n 174:\t\n 175:\tstatic void csc_hw_error_work(struct work_struct work)\n 176:\t{\n 177:\t\tstruct xe_tile tile = container_of(work, typeof(tile), csc_hw_error_work);\n 178:\t\tstruct xe_device xe = tile_to_xe(tile);\n 179:\t\n 180:\t\txe_survivability_mode_runtime_enable(xe);\n 181:\t}\n 182:\t\n 183:\tstatic void csc_hw_error_handler(struct xe_tile tile, const enum hardware_error hw_err)\n 184:\t{\n 185:\t\tconst enum drm_xe_ras_error_severity severity = hw_err_to_severity(hw_err);\n 186:\t\tconst char severity_str = error_severity[severity];\n 187:\t\tstruct xe_device xe = tile_to_xe(tile);\n 188:\t\tstruct xe_mmio mmio = \u0026tile-\u003emmio;\n 189:\t\tu32 base, err_bit, err_src;\n" }
25/2	2026/07/01 15:54	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 25737 output: 23 thoughts: 1286 Thoughts: WorthFuzzing Evaluation: False Okay, let's break this down. My initial thought was, "Aha, `csc_hw_error_work` doesn't directly trigger `hw_error_source_handler`." That handler is the key, and it looks like it gets called from `xe_hw_error_irq_handler`. The big question is: can syzkaller even touch that? It's an interrupt handler, meaning it's hardware-triggered. Syzkaller's not going to inject hardware interrupts directly, unless there's a specific software interface to do so. I then traced the call chain to `drm_ras_nl_error_event`. That leads to a bunch of internal calls: `xe_drm_ras_event`, `ras_send_error_event`, `xe_ras_counter_threshold_crossed`, `get_pending_event` via `xe_sysctrl_event.c`, and finally to `xe_sysctrl_work`, which is a workqueue item, potentially triggered by `xe_sysctrl_irq_handler`. So, it's all hardware-dependent, or a software interface which can be triggered. The conclusion is that syzkaller likely won't be able to trigger these paths easily unless it's fuzzing a virtual device that emulates the hardware interrupts, or if there's a debugfs interface that it can write to. The prompt mentioned debugfs, and I know syzkaller can use debugfs if it's available. However, even if syzkaller can reach it, this patch just adds a netlink event broadcast. Looking at the patch itself, it's just a standard netlink event broadcast. The other logic is pretty straightforward, sending the error event based on some conditions and counter values. This all feels very simple, and definitely inaccessible from userspace without hardware errors. Since the prompt states: "Return WorthFuzzing=false if the patch only contains: ... Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware", and `xe` is a real hardware driver (Intel Xe graphics), this code will be impossible to trigger in a virtualized environment. The syzkaller QEMU/GCE setup will not have the required hardware error emulation. I know that syzkaller has some support for `vkms` (Virtual KMS), but `xe` is a specific hardware driver and will not be loaded unless the hardware is present or mocked and the setup is not set up to do that. Even if it's loaded, hardware errors are not triggerable from userspace. So, it appears completely unreachable. Let me just double-check one last time that there's no other way to reach `drm_ras_nl_error_event`, given it is `EXPORT_SYMBOL`. I'll look to see if any other drivers might be using it. But for now, the conclusion is clear: WorthFuzzing=false.
26/2	2026/07/01 15:54	tool	grepper	0m Args: { "Expression": "drm_ras_nl_error_event" } Results: { "Output": "drivers/gpu/drm/drm_ras.c=222=static int doit_reply_value(struct genl_info info, u32 node_id,\n--\ndrivers/gpu/drm/drm_ras.c-258-/\ndrivers/gpu/drm/drm_ras.c:259: drm_ras_nl_error_event() - Report an error event\ndrivers/gpu/drm/drm_ras.c-260- * @node: Node structure\n--\ndrivers/gpu/drm/drm_ras.c-269- /\ndrivers/gpu/drm/drm_ras.c:270:int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id, const char error_name,\ndrivers/gpu/drm/drm_ras.c-271-\t\t\t u32 value, gfp_t flags)\n--\ndrivers/gpu/drm/drm_ras.c-309-}\ndrivers/gpu/drm/drm_ras.c:310:EXPORT_SYMBOL(drm_ras_nl_error_event);\ndrivers/gpu/drm/drm_ras.c-311-\n--\ndrivers/gpu/drm/xe/xe_drm_ras.c=198=void xe_drm_ras_event(struct xe_device xe, u32 component, u32 severity, u32 value, gfp_t flags)\n--\ndrivers/gpu/drm/xe/xe_drm_ras.c-213-\ndrivers/gpu/drm/xe/xe_drm_ras.c:214:\tret = drm_ras_nl_error_event(node, component, info[component].name, value, flags);\ndrivers/gpu/drm/xe/xe_drm_ras.c-215-\tif (ret)\n--\ninclude/drm/drm_ras.h=82=void drm_ras_node_unregister(struct drm_ras_node node);\ninclude/drm/drm_ras.h:83:int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id, const char error_name,\ninclude/drm/drm_ras.h-84-\t\t\t u32 value, gfp_t flags);\n--\ninclude/drm/drm_ras.h=87=static inline void drm_ras_node_unregister(struct drm_ras_node node) { }\ninclude/drm/drm_ras.h:88:static inline int drm_ras_nl_error_event(struct drm_ras_node node, u32 error_id,\ninclude/drm/drm_ras.h-89-\t\t\t\t\t const char error_name, u32 value, gfp_t flags)\n" }
27/2	2026/07/01 15:54	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 28366 output: 155 thoughts: 169 Thoughts: WorthFuzzing=false: A Quick Assessment Okay, after reviewing this patch, I've come to a firm conclusion. This isn't something Syzkaller needs to worry about. The core of it boils down to this: only `xe` is even using this new netlink multicast event. And, crucially, `xe` only calls it from its hardware error handlers. That means, realistically, it's unreachable. It's confined to the depths of hardware error handling. The event, `error-event`, which integrates into the `drm_ras` family is triggered by things like hardware interrupts and system controller events. I know that in virtualized environments, like QEMU or Google Compute Engine, which is where Syzkaller typically does its work, those triggers are just not going to happen. You'd need some very specific hardware emulation to even think about reaching that code. So, really, this patch isn't introducing any new, fuzzable functionality that Syzkaller can access. Therefore, I'm going to return WorthFuzzing=false. No need to devote any resources to this.
28/2	2026/07/01 15:54	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch adds a netlink multicast event `error-event` to the `drm_ras` family and integrates it into the `xe` DRM driver. The event is broadcasted by the kernel when hardware errors occur (handled in `hw_error_source_handler` and `xe_ras_counter_threshold_crossed`). These code paths are triggered by hardware interrupts and system controller events, which are impossible to reach from userspace in virtualized environments like QEMU or GCE without specific hardware emulation. Therefore, this patch does not introduce any new functionally reachable code for syzkaller to fuzz.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch adds a netlink multicast event `error-event` to the `drm_ras` family and integrates it into the `xe` DRM driver. The event is broadcasted by the kernel when hardware errors occur (handled in `hw_error_source_handler` and `xe_ras_counter_threshold_crossed`). These code paths are triggered by hardware interrupts and system controller events, which are impossible to reach from userspace in virtualized environments like QEMU or GCE without specific hardware emulation. Therefore, this patch does not introduce any new functionally reachable code for syzkaller to fuzz.", "WorthFuzzing": false }

LLM Calls Summary:
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Tool Calls Summary:
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