[PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[nishit.sharma]

From: Nishit Sharma <nishit.sharma@intel.com>

Inject a GT reset failure via the KMD fail_gt_reset debugfs hook, verify
the device wedges as expected, tolerate the resulting -ECANCELED errors in
the submitting threads, then recover by rebind and confirm the driver is
usable again.

Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
---
 tests/intel/xe_exec_reset.c | 107 ++++++++++++++++++++++++++++++++++--
 1 file changed, 101 insertions(+), 6 deletions(-)

diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
index 6eda71c32..1796e4ec1 100644
--- a/tests/intel/xe_exec_reset.c
+++ b/tests/intel/xe_exec_reset.c
@@ -16,6 +16,8 @@
 
 #include "igt.h"
 #include "igt_sysfs.h"
+#include "igt_device.h"
+#include "igt_kmod.h"
 #include "lib/igt_syncobj.h"
 #include "lib/intel_reg.h"
 #include "xe_drm.h"
@@ -140,6 +142,7 @@ static void test_spin(int fd, struct drm_xe_engine_class_instance *eci,
 #define DESTROY_VM_CTX_STRESS		(0x1 << 20)
 #define MIXED_ENGINE_STRESS		(0x1 << 21)
 #define PM_TRANSITION_STRESS		(0x1 << 22)
+#define FAULT_INJECT_STRESS		(0x1 << 23)
 
 /**
  * SUBTEST: %s-cat-error
@@ -760,7 +763,7 @@ static void submit_jobs(struct gt_thread_data *t)
 	uint32_t pressure_bos[PRESSURE_COUNT];
 	uint32_t *data;
 	int pressure_count;
-	int i = 0;
+	int i = 0, exec_ret;
 
 	bo = xe_bo_create(fd, vm, bo_size, vram_if_possible(fd, t->gt),
 			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
@@ -794,8 +797,25 @@ static void submit_jobs(struct gt_thread_data *t)
 			continue;
 		}
 
-		xe_exec(fd, &exec);
-		xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		/*
+		 * Once an injected GT reset failure wedges the device, exec and
+		 * queue teardown return -ECANCELED. That is the expected outcome
+		 * for the fault-injection stress
+		 */
+		if (t->flags & FAULT_INJECT_STRESS) {
+			struct drm_xe_exec_queue_destroy destroy = {
+				.exec_queue_id = exec.exec_queue_id,
+		};
+
+		exec_ret = __xe_exec(fd, &exec);
+		igt_assert_f(exec_ret == 0 || exec_ret == -ECANCELED,
+			     "exec returned unexpected error %d (expected 0 or -ECANCELED)\n",
+			     exec_ret);
+		igt_ioctl(fd, DRM_IOCTL_XE_EXEC_QUEUE_DESTROY, &destroy);
+		} else {
+			xe_exec(fd, &exec);
+			xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		}
 		(*t->num_submit)++;
 
 		if ((t->flags & MEM_PRESSURE_STRESS) && !(i % 128)) {
@@ -829,8 +849,20 @@ static void submit_jobs(struct gt_thread_data *t)
 		pressure_bo_destroy(fd, pressure_bos, PRESSURE_COUNT);
 
 	munmap(data, bo_size);
-	gem_close(fd, bo);
-	xe_vm_destroy(fd, vm);
+	/*
+	 * On a device wedged by injected GT reset failures, BO close and VM
+	 * destroy also return -ECANCELED.
+	 */
+	if (t->flags & FAULT_INJECT_STRESS) {
+		struct drm_gem_close close_bo = { .handle = bo };
+		struct drm_xe_vm_destroy vm_destroy = { .vm_id = vm };
+
+		igt_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
+		igt_ioctl(fd, DRM_IOCTL_XE_VM_DESTROY, &vm_destroy);
+	} else {
+		gem_close(fd, bo);
+		xe_vm_destroy(fd, vm);
+	}
 }
 
 static void *gt_reset_thread(void *data)
@@ -850,6 +882,33 @@ static void *gt_reset_thread(void *data)
 	return NULL;
 }
 
+static void gt_reset_fault_injection(int fd, bool enable)
+{
+	igt_debugfs_write(fd, "fail_gt_reset/probability", enable ? "100" : "0");
+	igt_debugfs_write(fd, "fail_gt_reset/times", enable ? "2" : "1");
+}
+
+static int try_vm_create(int fd)
+{
+	struct drm_xe_vm_create create = { 0 };
+	int err = 0;
+
+	if (igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create))
+		err = -errno;
+	else
+		xe_vm_destroy(fd, create.vm_id);
+
+	return err;
+}
+
+static void ignore_gt_reset_fault_dmesg(void)
+{
+	igt_emit_ignore_dmesg_regex("reset failed \\(-ECANCELED\\)"
+				    "|declared device .* as wedged"
+				    "|GPU HANG"
+				    "|Failed to reset");
+}
+
 /**
  * SUBTEST: gt-reset-stress
  * Description: Stress GT reset
@@ -891,6 +950,9 @@ static void *gt_reset_thread(void *data)
  * Description: Test GT reset while long spinner workload is active
  * Test category: stress test
  *
+ * SUBTEST: gt-reset-fault-injection
+ * Description: Stress concurrent GT resets and job submissions with GT reset failures injected via debugfs
+ * Test category: fault injection
  */
 static void
 gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
@@ -907,6 +969,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	pthread_mutex_init(&mutex, 0);
 	pthread_cond_init(&cond, 0);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_fault_injection(fd, true);
+
 	for (i = 0; i < n_threads; ++i) {
 		threads[i].mutex = &mutex;
 		threads[i].cond = &cond;
@@ -940,6 +1005,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	igt_info("number of resets %d, submissions %d, submit fails %d vm_recreate %d\n",
 		 num_reset, num_submit, num_submit_fail, num_vm_recreate);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_fault_injection(fd, true);
+
 	igt_assert_neq(num_reset, 0);
 	igt_assert_neq(num_submit, 0);
 	free(threads);
@@ -1122,6 +1190,7 @@ int igt_main()
 	int gt;
 	int class;
 	int fd;
+	char pci_slot[NAME_MAX];
 
 	igt_fixture()
 		fd = drm_open_driver(DRIVER_XE);
@@ -1326,6 +1395,29 @@ int igt_main()
 			break;
 		}
 
+	igt_subtest("gt-reset-fault-injection") {
+		igt_require_f(igt_debugfs_exists(fd, "fail_gt_reset/probability",
+						 O_RDWR),
+			      "GT reset fault injection not available; "
+			      "CONFIG_DRM_XE_KUNIT_TEST/fault-injection must be "
+			      "enabled in the KMD\n");
+
+		igt_device_get_pci_slot_name(fd, pci_slot);
+		ignore_gt_reset_fault_dmesg();
+
+		gt_reset(fd, 0, 8, 2, FAULT_INJECT_STRESS);
+
+		igt_assert_f(try_vm_create(fd) != 0,
+			     "Device did not wedge after injected GT reset failure\n");
+
+		drm_close_driver(fd);
+		igt_kmod_rebind("xe", pci_slot);
+		fd = drm_open_driver(DRIVER_XE);
+
+		igt_assert_f(try_vm_create(fd) == 0,
+			     "Device not functional after rebind recovery\n");
+	}
+
 	igt_subtest("gt-mocs-reset")
 		xe_for_each_gt(fd, gt)
 			gt_mocs_reset(fd, gt);
@@ -1455,6 +1547,9 @@ int igt_main()
 		}
 	}
 
-	igt_fixture()
+	igt_fixture() {
+		if (igt_debugfs_exists(fd, "fail_gt_reset/probability", O_RDWR))
+			gt_reset_fault_injection(fd, false);
 		drm_close_driver(fd);
+	}
 }
-- 
2.43.0

[PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[nishit.sharma]

From: Nishit Sharma <nishit.sharma@intel.com>

Inject a GT reset failure via the KMD fail_gt_reset debugfs hook, verify
the device wedges as expected, tolerate the resulting -ECANCELED errors in
the submitting threads, then recover by rebind and confirm the driver is
usable again.

Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
---
 tests/intel/xe_exec_reset.c | 107 ++++++++++++++++++++++++++++++++++--
 1 file changed, 101 insertions(+), 6 deletions(-)

diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
index 6eda71c32..1796e4ec1 100644
--- a/tests/intel/xe_exec_reset.c
+++ b/tests/intel/xe_exec_reset.c
@@ -16,6 +16,8 @@
 
 #include "igt.h"
 #include "igt_sysfs.h"
+#include "igt_device.h"
+#include "igt_kmod.h"
 #include "lib/igt_syncobj.h"
 #include "lib/intel_reg.h"
 #include "xe_drm.h"
@@ -140,6 +142,7 @@ static void test_spin(int fd, struct drm_xe_engine_class_instance *eci,
 #define DESTROY_VM_CTX_STRESS		(0x1 << 20)
 #define MIXED_ENGINE_STRESS		(0x1 << 21)
 #define PM_TRANSITION_STRESS		(0x1 << 22)
+#define FAULT_INJECT_STRESS		(0x1 << 23)
 
 /**
  * SUBTEST: %s-cat-error
@@ -760,7 +763,7 @@ static void submit_jobs(struct gt_thread_data *t)
 	uint32_t pressure_bos[PRESSURE_COUNT];
 	uint32_t *data;
 	int pressure_count;
-	int i = 0;
+	int i = 0, exec_ret;
 
 	bo = xe_bo_create(fd, vm, bo_size, vram_if_possible(fd, t->gt),
 			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
@@ -794,8 +797,25 @@ static void submit_jobs(struct gt_thread_data *t)
 			continue;
 		}
 
-		xe_exec(fd, &exec);
-		xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		/*
+		 * Once an injected GT reset failure wedges the device, exec and
+		 * queue teardown return -ECANCELED. That is the expected outcome
+		 * for the fault-injection stress
+		 */
+		if (t->flags & FAULT_INJECT_STRESS) {
+			struct drm_xe_exec_queue_destroy destroy = {
+				.exec_queue_id = exec.exec_queue_id,
+		};
+
+		exec_ret = __xe_exec(fd, &exec);
+		igt_assert_f(exec_ret == 0 || exec_ret == -ECANCELED,
+			     "exec returned unexpected error %d (expected 0 or -ECANCELED)\n",
+			     exec_ret);
+		igt_ioctl(fd, DRM_IOCTL_XE_EXEC_QUEUE_DESTROY, &destroy);
+		} else {
+			xe_exec(fd, &exec);
+			xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		}
 		(*t->num_submit)++;
 
 		if ((t->flags & MEM_PRESSURE_STRESS) && !(i % 128)) {
@@ -829,8 +849,20 @@ static void submit_jobs(struct gt_thread_data *t)
 		pressure_bo_destroy(fd, pressure_bos, PRESSURE_COUNT);
 
 	munmap(data, bo_size);
-	gem_close(fd, bo);
-	xe_vm_destroy(fd, vm);
+	/*
+	 * On a device wedged by injected GT reset failures, BO close and VM
+	 * destroy also return -ECANCELED.
+	 */
+	if (t->flags & FAULT_INJECT_STRESS) {
+		struct drm_gem_close close_bo = { .handle = bo };
+		struct drm_xe_vm_destroy vm_destroy = { .vm_id = vm };
+
+		igt_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
+		igt_ioctl(fd, DRM_IOCTL_XE_VM_DESTROY, &vm_destroy);
+	} else {
+		gem_close(fd, bo);
+		xe_vm_destroy(fd, vm);
+	}
 }
 
 static void *gt_reset_thread(void *data)
@@ -850,6 +882,33 @@ static void *gt_reset_thread(void *data)
 	return NULL;
 }
 
+static void gt_reset_fault_injection(int fd, bool enable)
+{
+	igt_debugfs_write(fd, "fail_gt_reset/probability", enable ? "100" : "0");
+	igt_debugfs_write(fd, "fail_gt_reset/times", enable ? "2" : "1");
+}
+
+static int try_vm_create(int fd)
+{
+	struct drm_xe_vm_create create = { 0 };
+	int err = 0;
+
+	if (igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create))
+		err = -errno;
+	else
+		xe_vm_destroy(fd, create.vm_id);
+
+	return err;
+}
+
+static void ignore_gt_reset_fault_dmesg(void)
+{
+	igt_emit_ignore_dmesg_regex("reset failed \\(-ECANCELED\\)"
+				    "|declared device .* as wedged"
+				    "|GPU HANG"
+				    "|Failed to reset");
+}
+
 /**
  * SUBTEST: gt-reset-stress
  * Description: Stress GT reset
@@ -891,6 +950,9 @@ static void *gt_reset_thread(void *data)
  * Description: Test GT reset while long spinner workload is active
  * Test category: stress test
  *
+ * SUBTEST: gt-reset-fault-injection
+ * Description: Stress concurrent GT resets and job submissions with GT reset failures injected via debugfs
+ * Test category: fault injection
  */
 static void
 gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
@@ -907,6 +969,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	pthread_mutex_init(&mutex, 0);
 	pthread_cond_init(&cond, 0);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_fault_injection(fd, true);
+
 	for (i = 0; i < n_threads; ++i) {
 		threads[i].mutex = &mutex;
 		threads[i].cond = &cond;
@@ -940,6 +1005,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	igt_info("number of resets %d, submissions %d, submit fails %d vm_recreate %d\n",
 		 num_reset, num_submit, num_submit_fail, num_vm_recreate);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_fault_injection(fd, true);
+
 	igt_assert_neq(num_reset, 0);
 	igt_assert_neq(num_submit, 0);
 	free(threads);
@@ -1122,6 +1190,7 @@ int igt_main()
 	int gt;
 	int class;
 	int fd;
+	char pci_slot[NAME_MAX];
 
 	igt_fixture()
 		fd = drm_open_driver(DRIVER_XE);
@@ -1326,6 +1395,29 @@ int igt_main()
 			break;
 		}
 
+	igt_subtest("gt-reset-fault-injection") {
+		igt_require_f(igt_debugfs_exists(fd, "fail_gt_reset/probability",
+						 O_RDWR),
+			      "GT reset fault injection not available; "
+			      "CONFIG_DRM_XE_KUNIT_TEST/fault-injection must be "
+			      "enabled in the KMD\n");
+
+		igt_device_get_pci_slot_name(fd, pci_slot);
+		ignore_gt_reset_fault_dmesg();
+
+		gt_reset(fd, 0, 8, 2, FAULT_INJECT_STRESS);
+
+		igt_assert_f(try_vm_create(fd) != 0,
+			     "Device did not wedge after injected GT reset failure\n");
+
+		drm_close_driver(fd);
+		igt_kmod_rebind("xe", pci_slot);
+		fd = drm_open_driver(DRIVER_XE);
+
+		igt_assert_f(try_vm_create(fd) == 0,
+			     "Device not functional after rebind recovery\n");
+	}
+
 	igt_subtest("gt-mocs-reset")
 		xe_for_each_gt(fd, gt)
 			gt_mocs_reset(fd, gt);
@@ -1455,6 +1547,9 @@ int igt_main()
 		}
 	}
 
-	igt_fixture()
+	igt_fixture() {
+		if (igt_debugfs_exists(fd, "fail_gt_reset/probability", O_RDWR))
+			gt_reset_fault_injection(fd, false);
 		drm_close_driver(fd);
+	}
 }
-- 
2.34.1

Re: [PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[Kamil Konieczny]

Hi Nishit,
On 2026-08-25 at 03:25:20 +0000, nishit.sharma@intel.com wrote:
> From: Nishit Sharma <nishit.sharma@intel.com>
> 
> Inject a GT reset failure via the KMD fail_gt_reset debugfs hook, verify
> the device wedges as expected, tolerate the resulting -ECANCELED errors in
> the submitting threads, then recover by rebind and confirm the driver is
> usable again.
> 
> Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
> ---
>  tests/intel/xe_exec_reset.c | 107 ++++++++++++++++++++++++++++++++++--
>  1 file changed, 101 insertions(+), 6 deletions(-)
> 
> diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
> index 6eda71c32..1796e4ec1 100644
> --- a/tests/intel/xe_exec_reset.c
> +++ b/tests/intel/xe_exec_reset.c
> @@ -16,6 +16,8 @@
>  
>  #include "igt.h"
>  #include "igt_sysfs.h"
> +#include "igt_device.h"
> +#include "igt_kmod.h"
>  #include "lib/igt_syncobj.h"
>  #include "lib/intel_reg.h"
>  #include "xe_drm.h"
> @@ -140,6 +142,7 @@ static void test_spin(int fd, struct drm_xe_engine_class_instance *eci,
>  #define DESTROY_VM_CTX_STRESS		(0x1 << 20)
>  #define MIXED_ENGINE_STRESS		(0x1 << 21)
>  #define PM_TRANSITION_STRESS		(0x1 << 22)
> +#define FAULT_INJECT_STRESS		(0x1 << 23)
>  
>  /**
>   * SUBTEST: %s-cat-error
> @@ -760,7 +763,7 @@ static void submit_jobs(struct gt_thread_data *t)
>  	uint32_t pressure_bos[PRESSURE_COUNT];
>  	uint32_t *data;
>  	int pressure_count;
> -	int i = 0;
> +	int i = 0, exec_ret;
>  
>  	bo = xe_bo_create(fd, vm, bo_size, vram_if_possible(fd, t->gt),
>  			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
> @@ -794,8 +797,25 @@ static void submit_jobs(struct gt_thread_data *t)
>  			continue;
>  		}
>  
> -		xe_exec(fd, &exec);
> -		xe_exec_queue_destroy(fd, exec.exec_queue_id);
> +		/*
> +		 * Once an injected GT reset failure wedges the device, exec and
> +		 * queue teardown return -ECANCELED. That is the expected outcome
> +		 * for the fault-injection stress
> +		 */
> +		if (t->flags & FAULT_INJECT_STRESS) {
> +			struct drm_xe_exec_queue_destroy destroy = {
> +				.exec_queue_id = exec.exec_queue_id,
> +		};
> +
> +		exec_ret = __xe_exec(fd, &exec);
> +		igt_assert_f(exec_ret == 0 || exec_ret == -ECANCELED,
> +			     "exec returned unexpected error %d (expected 0 or -ECANCELED)\n",
> +			     exec_ret);
> +		igt_ioctl(fd, DRM_IOCTL_XE_EXEC_QUEUE_DESTROY, &destroy);
> +		} else {
> +			xe_exec(fd, &exec);
> +			xe_exec_queue_destroy(fd, exec.exec_queue_id);
> +		}
>  		(*t->num_submit)++;
>  
>  		if ((t->flags & MEM_PRESSURE_STRESS) && !(i % 128)) {
> @@ -829,8 +849,20 @@ static void submit_jobs(struct gt_thread_data *t)
>  		pressure_bo_destroy(fd, pressure_bos, PRESSURE_COUNT);
>  
>  	munmap(data, bo_size);
> -	gem_close(fd, bo);
> -	xe_vm_destroy(fd, vm);
> +	/*
> +	 * On a device wedged by injected GT reset failures, BO close and VM
> +	 * destroy also return -ECANCELED.
> +	 */
> +	if (t->flags & FAULT_INJECT_STRESS) {
> +		struct drm_gem_close close_bo = { .handle = bo };
> +		struct drm_xe_vm_destroy vm_destroy = { .vm_id = vm };
> +
> +		igt_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
> +		igt_ioctl(fd, DRM_IOCTL_XE_VM_DESTROY, &vm_destroy);
> +	} else {
> +		gem_close(fd, bo);
> +		xe_vm_destroy(fd, vm);
> +	}
>  }
>  
>  static void *gt_reset_thread(void *data)
> @@ -850,6 +882,33 @@ static void *gt_reset_thread(void *data)
>  	return NULL;
>  }
>  
> +static void gt_reset_fault_injection(int fd, bool enable)
> +{
> +	igt_debugfs_write(fd, "fail_gt_reset/probability", enable ? "100" : "0");
> +	igt_debugfs_write(fd, "fail_gt_reset/times", enable ? "2" : "1");
> +}

imho this function should be two functions, one for enabling
and second for disabling. Second one should be non-fd and
registered as at_exit() function, in case any of signals
happens (not catched by final igt_fixture).

So here:

static void gt_reset_enable_fault_injection(int fd)

static void gt_reset_disable_fault_injection(void)

> +
> +static int try_vm_create(int fd)
> +{
> +	struct drm_xe_vm_create create = { 0 };
> +	int err = 0;
> +
> +	if (igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create))
> +		err = -errno;
> +	else
> +		xe_vm_destroy(fd, create.vm_id);
> +
> +	return err;
> +}
> +
> +static void ignore_gt_reset_fault_dmesg(void)
> +{
> +	igt_emit_ignore_dmesg_regex("reset failed \\(-ECANCELED\\)"
> +				    "|declared device .* as wedged"
> +				    "|GPU HANG"
> +				    "|Failed to reset");
> +}
> +
>  /**
>   * SUBTEST: gt-reset-stress
>   * Description: Stress GT reset
> @@ -891,6 +950,9 @@ static void *gt_reset_thread(void *data)
>   * Description: Test GT reset while long spinner workload is active
>   * Test category: stress test
>   *
> + * SUBTEST: gt-reset-fault-injection
> + * Description: Stress concurrent GT resets and job submissions with GT reset failures injected via debugfs
> + * Test category: fault injection
>   */
>  static void
>  gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
> @@ -907,6 +969,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
>  	pthread_mutex_init(&mutex, 0);
>  	pthread_cond_init(&cond, 0);
>  
> +	if (flags & FAULT_INJECT_STRESS)
> +		gt_reset_fault_injection(fd, true);
> +
>  	for (i = 0; i < n_threads; ++i) {
>  		threads[i].mutex = &mutex;
>  		threads[i].cond = &cond;
> @@ -940,6 +1005,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
>  	igt_info("number of resets %d, submissions %d, submit fails %d vm_recreate %d\n",
>  		 num_reset, num_submit, num_submit_fail, num_vm_recreate);
>  
> +	if (flags & FAULT_INJECT_STRESS)
> +		gt_reset_fault_injection(fd, true);
> +
>  	igt_assert_neq(num_reset, 0);
>  	igt_assert_neq(num_submit, 0);
>  	free(threads);
> @@ -1122,6 +1190,7 @@ int igt_main()
>  	int gt;
>  	int class;
>  	int fd;
> +	char pci_slot[NAME_MAX];
>  
>  	igt_fixture()
>  		fd = drm_open_driver(DRIVER_XE);
> @@ -1326,6 +1395,29 @@ int igt_main()
>  			break;
>  		}
>  
> +	igt_subtest("gt-reset-fault-injection") {
> +		igt_require_f(igt_debugfs_exists(fd, "fail_gt_reset/probability",
> +						 O_RDWR),
> +			      "GT reset fault injection not available; "
> +			      "CONFIG_DRM_XE_KUNIT_TEST/fault-injection must be "
> +			      "enabled in the KMD\n");
> +
> +		igt_device_get_pci_slot_name(fd, pci_slot);
> +		ignore_gt_reset_fault_dmesg();
> +
> +		gt_reset(fd, 0, 8, 2, FAULT_INJECT_STRESS);
> +
> +		igt_assert_f(try_vm_create(fd) != 0,
> +			     "Device did not wedge after injected GT reset failure\n");
> +
> +		drm_close_driver(fd);
> +		igt_kmod_rebind("xe", pci_slot);
> +		fd = drm_open_driver(DRIVER_XE);
> +
> +		igt_assert_f(try_vm_create(fd) == 0,
> +			     "Device not functional after rebind recovery\n");
> +	}
> +
>  	igt_subtest("gt-mocs-reset")
>  		xe_for_each_gt(fd, gt)
>  			gt_mocs_reset(fd, gt);
> @@ -1455,6 +1547,9 @@ int igt_main()
>  		}
>  	}
>  
> -	igt_fixture()
> +	igt_fixture() {
> +		if (igt_debugfs_exists(fd, "fail_gt_reset/probability", O_RDWR))
> +			gt_reset_fault_injection(fd, false);

See note above, some errors like SIGSEGV would make it
unreachable.

Regards,
Kamil

>  		drm_close_driver(fd);
> +	}
>  }
> -- 
> 2.34.1
> 

[PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[nishit.sharma]

From: Nishit Sharma <nishit.sharma@intel.com>

Inject a GT reset failure via the KMD fail_gt_reset debugfs hook, verify
the device wedges as expected, tolerate the resulting -ECANCELED errors in
the submitting threads, then recover by rebind and confirm the driver is
usable again.

Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
---
 tests/intel/xe_exec_reset.c | 123 ++++++++++++++++++++++++++++++++++--
 1 file changed, 118 insertions(+), 5 deletions(-)

diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
index 6eda71c32..f3226579f 100644
--- a/tests/intel/xe_exec_reset.c
+++ b/tests/intel/xe_exec_reset.c
@@ -16,6 +16,8 @@
 
 #include "igt.h"
 #include "igt_sysfs.h"
+#include "igt_device.h"
+#include "igt_kmod.h"
 #include "lib/igt_syncobj.h"
 #include "lib/intel_reg.h"
 #include "xe_drm.h"
@@ -140,6 +142,7 @@ static void test_spin(int fd, struct drm_xe_engine_class_instance *eci,
 #define DESTROY_VM_CTX_STRESS		(0x1 << 20)
 #define MIXED_ENGINE_STRESS		(0x1 << 21)
 #define PM_TRANSITION_STRESS		(0x1 << 22)
+#define FAULT_INJECT_STRESS		(0x1 << 23)
 
 /**
  * SUBTEST: %s-cat-error
@@ -760,7 +763,7 @@ static void submit_jobs(struct gt_thread_data *t)
 	uint32_t pressure_bos[PRESSURE_COUNT];
 	uint32_t *data;
 	int pressure_count;
-	int i = 0;
+	int i = 0, exec_ret;
 
 	bo = xe_bo_create(fd, vm, bo_size, vram_if_possible(fd, t->gt),
 			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
@@ -794,8 +797,25 @@ static void submit_jobs(struct gt_thread_data *t)
 			continue;
 		}
 
-		xe_exec(fd, &exec);
-		xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		/*
+		 * Once an injected GT reset failure wedges the device, exec and
+		 * queue teardown return -ECANCELED. That is the expected outcome
+		 * for the fault-injection stress
+		 */
+		if (t->flags & FAULT_INJECT_STRESS) {
+			struct drm_xe_exec_queue_destroy destroy = {
+				.exec_queue_id = exec.exec_queue_id,
+		};
+
+		exec_ret = __xe_exec(fd, &exec);
+		igt_assert_f(exec_ret == 0 || exec_ret == -ECANCELED,
+			     "exec returned unexpected error %d (expected 0 or -ECANCELED)\n",
+			     exec_ret);
+		igt_ioctl(fd, DRM_IOCTL_XE_EXEC_QUEUE_DESTROY, &destroy);
+		} else {
+			xe_exec(fd, &exec);
+			xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		}
 		(*t->num_submit)++;
 
 		if ((t->flags & MEM_PRESSURE_STRESS) && !(i % 128)) {
@@ -829,8 +849,20 @@ static void submit_jobs(struct gt_thread_data *t)
 		pressure_bo_destroy(fd, pressure_bos, PRESSURE_COUNT);
 
 	munmap(data, bo_size);
-	gem_close(fd, bo);
-	xe_vm_destroy(fd, vm);
+	/*
+	 * On a device wedged by injected GT reset failures, BO close and VM
+	 * destroy also return -ECANCELED.
+	 */
+	if (t->flags & FAULT_INJECT_STRESS) {
+		struct drm_gem_close close_bo = { .handle = bo };
+		struct drm_xe_vm_destroy vm_destroy = { .vm_id = vm };
+
+		igt_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
+		igt_ioctl(fd, DRM_IOCTL_XE_VM_DESTROY, &vm_destroy);
+	} else {
+		gem_close(fd, bo);
+		xe_vm_destroy(fd, vm);
+	}
 }
 
 static void *gt_reset_thread(void *data)
@@ -850,6 +882,54 @@ static void *gt_reset_thread(void *data)
 	return NULL;
 }
 
+static int fault_inject_fd = -1;
+
+static void gt_reset_disable_fault_injection(int sig)
+{
+	if (fault_inject_fd < 0)
+		return;
+
+	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/probability", "0");
+	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/times", "1");
+	fault_inject_fd = -1;
+}
+
+static void gt_reset_enable_fault_injection(int fd)
+{
+	static bool exit_handler_installed;
+
+	fault_inject_fd = fd;
+
+	if (!exit_handler_installed) {
+		igt_install_exit_handler(gt_reset_disable_fault_injection);
+		exit_handler_installed = true;
+	}
+
+	igt_debugfs_write(fd, "fail_gt_reset/probability", "100");
+	igt_debugfs_write(fd, "fail_gt_reset/times", "2");
+}
+
+static int try_vm_create(int fd)
+{
+	struct drm_xe_vm_create create = { 0 };
+	int err = 0;
+
+	if (igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create))
+		err = -errno;
+	else
+		xe_vm_destroy(fd, create.vm_id);
+
+	return err;
+}
+
+static void ignore_gt_reset_fault_dmesg(void)
+{
+	igt_emit_ignore_dmesg_regex("reset failed \\(-ECANCELED\\)"
+				    "|declared device .* as wedged"
+				    "|GPU HANG"
+				    "|Failed to reset");
+}
+
 /**
  * SUBTEST: gt-reset-stress
  * Description: Stress GT reset
@@ -891,6 +971,9 @@ static void *gt_reset_thread(void *data)
  * Description: Test GT reset while long spinner workload is active
  * Test category: stress test
  *
+ * SUBTEST: gt-reset-fault-injection
+ * Description: Stress concurrent GT resets and job submissions with GT reset failures injected via debugfs
+ * Test category: fault injection
  */
 static void
 gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
@@ -907,6 +990,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	pthread_mutex_init(&mutex, 0);
 	pthread_cond_init(&cond, 0);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_enable_fault_injection(fd);
+
 	for (i = 0; i < n_threads; ++i) {
 		threads[i].mutex = &mutex;
 		threads[i].cond = &cond;
@@ -940,6 +1026,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	igt_info("number of resets %d, submissions %d, submit fails %d vm_recreate %d\n",
 		 num_reset, num_submit, num_submit_fail, num_vm_recreate);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_disable_fault_injection(0);
+
 	igt_assert_neq(num_reset, 0);
 	igt_assert_neq(num_submit, 0);
 	free(threads);
@@ -1122,6 +1211,7 @@ int igt_main()
 	int gt;
 	int class;
 	int fd;
+	char pci_slot[NAME_MAX];
 
 	igt_fixture()
 		fd = drm_open_driver(DRIVER_XE);
@@ -1326,6 +1416,29 @@ int igt_main()
 			break;
 		}
 
+	igt_subtest("gt-reset-fault-injection") {
+		igt_require_f(igt_debugfs_exists(fd, "fail_gt_reset/probability",
+						 O_RDWR),
+			      "GT reset fault injection not available; "
+			      "CONFIG_DRM_XE_KUNIT_TEST/fault-injection must be "
+			      "enabled in the KMD\n");
+
+		igt_device_get_pci_slot_name(fd, pci_slot);
+		ignore_gt_reset_fault_dmesg();
+
+		gt_reset(fd, 0, 8, 2, FAULT_INJECT_STRESS);
+
+		igt_assert_f(try_vm_create(fd) != 0,
+			     "Device did not wedge after injected GT reset failure\n");
+
+		drm_close_driver(fd);
+		igt_kmod_rebind("xe", pci_slot);
+		fd = drm_open_driver(DRIVER_XE);
+
+		igt_assert_f(try_vm_create(fd) == 0,
+			     "Device not functional after rebind recovery\n");
+	}
+
 	igt_subtest("gt-mocs-reset")
 		xe_for_each_gt(fd, gt)
 			gt_mocs_reset(fd, gt);
-- 
2.43.0

Re: [PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[Kamil Konieczny]

Hi Nishit,
On 2026-09-01 at 03:44:03 +0000, nishit.sharma@intel.com wrote:
> From: Nishit Sharma <nishit.sharma@intel.com>
> 
> Inject a GT reset failure via the KMD fail_gt_reset debugfs hook, verify
> the device wedges as expected, tolerate the resulting -ECANCELED errors in
> the submitting threads, then recover by rebind and confirm the driver is
> usable again.
> 
> Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
> ---
>  tests/intel/xe_exec_reset.c | 123 ++++++++++++++++++++++++++++++++++--
>  1 file changed, 118 insertions(+), 5 deletions(-)
> 
> diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
> index 6eda71c32..f3226579f 100644
> --- a/tests/intel/xe_exec_reset.c
> +++ b/tests/intel/xe_exec_reset.c
> @@ -16,6 +16,8 @@
>  
>  #include "igt.h"
>  #include "igt_sysfs.h"
> +#include "igt_device.h"
> +#include "igt_kmod.h"

Move these up before igt_sysfs.h, keep it sorted.

>  #include "lib/igt_syncobj.h"
>  #include "lib/intel_reg.h"
>  #include "xe_drm.h"
> @@ -140,6 +142,7 @@ static void test_spin(int fd, struct drm_xe_engine_class_instance *eci,
>  #define DESTROY_VM_CTX_STRESS		(0x1 << 20)
>  #define MIXED_ENGINE_STRESS		(0x1 << 21)
>  #define PM_TRANSITION_STRESS		(0x1 << 22)
> +#define FAULT_INJECT_STRESS		(0x1 << 23)
>  
>  /**
>   * SUBTEST: %s-cat-error
> @@ -760,7 +763,7 @@ static void submit_jobs(struct gt_thread_data *t)
>  	uint32_t pressure_bos[PRESSURE_COUNT];
>  	uint32_t *data;
>  	int pressure_count;
> -	int i = 0;
> +	int i = 0, exec_ret;
>  
>  	bo = xe_bo_create(fd, vm, bo_size, vram_if_possible(fd, t->gt),
>  			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
> @@ -794,8 +797,25 @@ static void submit_jobs(struct gt_thread_data *t)
>  			continue;
>  		}
>  
> -		xe_exec(fd, &exec);
> -		xe_exec_queue_destroy(fd, exec.exec_queue_id);
> +		/*
> +		 * Once an injected GT reset failure wedges the device, exec and
> +		 * queue teardown return -ECANCELED. That is the expected outcome
> +		 * for the fault-injection stress
> +		 */
> +		if (t->flags & FAULT_INJECT_STRESS) {
> +			struct drm_xe_exec_queue_destroy destroy = {
> +				.exec_queue_id = exec.exec_queue_id,
> +		};
> +
> +		exec_ret = __xe_exec(fd, &exec);
> +		igt_assert_f(exec_ret == 0 || exec_ret == -ECANCELED,
> +			     "exec returned unexpected error %d (expected 0 or -ECANCELED)\n",
> +			     exec_ret);
> +		igt_ioctl(fd, DRM_IOCTL_XE_EXEC_QUEUE_DESTROY, &destroy);
> +		} else {
> +			xe_exec(fd, &exec);
> +			xe_exec_queue_destroy(fd, exec.exec_queue_id);
> +		}
>  		(*t->num_submit)++;
>  
>  		if ((t->flags & MEM_PRESSURE_STRESS) && !(i % 128)) {
> @@ -829,8 +849,20 @@ static void submit_jobs(struct gt_thread_data *t)
>  		pressure_bo_destroy(fd, pressure_bos, PRESSURE_COUNT);
>  
>  	munmap(data, bo_size);
> -	gem_close(fd, bo);
> -	xe_vm_destroy(fd, vm);
> +	/*
> +	 * On a device wedged by injected GT reset failures, BO close and VM
> +	 * destroy also return -ECANCELED.
> +	 */
> +	if (t->flags & FAULT_INJECT_STRESS) {
> +		struct drm_gem_close close_bo = { .handle = bo };
> +		struct drm_xe_vm_destroy vm_destroy = { .vm_id = vm };
> +
> +		igt_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
> +		igt_ioctl(fd, DRM_IOCTL_XE_VM_DESTROY, &vm_destroy);
> +	} else {
> +		gem_close(fd, bo);
> +		xe_vm_destroy(fd, vm);
> +	}
>  }
>  
>  static void *gt_reset_thread(void *data)
> @@ -850,6 +882,54 @@ static void *gt_reset_thread(void *data)
>  	return NULL;
>  }
>  
> +static int fault_inject_fd = -1;
> +
> +static void gt_reset_disable_fault_injection(int sig)
> +{
> +	if (fault_inject_fd < 0)
> +		return;
> +
> +	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/probability", "0");
> +	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/times", "1");
> +	fault_inject_fd = -1;
> +}

Now this looks ok but see a note at a test.

> +
> +static void gt_reset_enable_fault_injection(int fd)
> +{
> +	static bool exit_handler_installed;
> +
> +	fault_inject_fd = fd;
> +
> +	if (!exit_handler_installed) {
> +		igt_install_exit_handler(gt_reset_disable_fault_injection);
> +		exit_handler_installed = true;
> +	}
> +
> +	igt_debugfs_write(fd, "fail_gt_reset/probability", "100");
> +	igt_debugfs_write(fd, "fail_gt_reset/times", "2");
> +}
> +
> +static int try_vm_create(int fd)
> +{
> +	struct drm_xe_vm_create create = { 0 };
> +	int err = 0;
> +
> +	if (igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create))
> +		err = -errno;
> +	else
> +		xe_vm_destroy(fd, create.vm_id);
> +
> +	return err;
> +}
> +
> +static void ignore_gt_reset_fault_dmesg(void)
> +{
> +	igt_emit_ignore_dmesg_regex("reset failed \\(-ECANCELED\\)"
> +				    "|declared device .* as wedged"
> +				    "|GPU HANG"
> +				    "|Failed to reset");
> +}
> +
>  /**
>   * SUBTEST: gt-reset-stress
>   * Description: Stress GT reset
> @@ -891,6 +971,9 @@ static void *gt_reset_thread(void *data)
>   * Description: Test GT reset while long spinner workload is active
>   * Test category: stress test
>   *
> + * SUBTEST: gt-reset-fault-injection
> + * Description: Stress concurrent GT resets and job submissions with GT reset failures injected via debugfs
> + * Test category: fault injection
>   */
>  static void
>  gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
> @@ -907,6 +990,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
>  	pthread_mutex_init(&mutex, 0);
>  	pthread_cond_init(&cond, 0);
>  
> +	if (flags & FAULT_INJECT_STRESS)
> +		gt_reset_enable_fault_injection(fd);
> +
>  	for (i = 0; i < n_threads; ++i) {
>  		threads[i].mutex = &mutex;
>  		threads[i].cond = &cond;
> @@ -940,6 +1026,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
>  	igt_info("number of resets %d, submissions %d, submit fails %d vm_recreate %d\n",
>  		 num_reset, num_submit, num_submit_fail, num_vm_recreate);
>  
> +	if (flags & FAULT_INJECT_STRESS)
> +		gt_reset_disable_fault_injection(0);
> +
>  	igt_assert_neq(num_reset, 0);
>  	igt_assert_neq(num_submit, 0);
>  	free(threads);
> @@ -1122,6 +1211,7 @@ int igt_main()
>  	int gt;
>  	int class;
>  	int fd;
> +	char pci_slot[NAME_MAX];
>  
>  	igt_fixture()
>  		fd = drm_open_driver(DRIVER_XE);
> @@ -1326,6 +1416,29 @@ int igt_main()
>  			break;
>  		}
>  
> +	igt_subtest("gt-reset-fault-injection") {
> +		igt_require_f(igt_debugfs_exists(fd, "fail_gt_reset/probability",
> +						 O_RDWR),
> +			      "GT reset fault injection not available; "
> +			      "CONFIG_DRM_XE_KUNIT_TEST/fault-injection must be "
> +			      "enabled in the KMD\n");
> +
> +		igt_device_get_pci_slot_name(fd, pci_slot);
> +		ignore_gt_reset_fault_dmesg();
> +
> +		gt_reset(fd, 0, 8, 2, FAULT_INJECT_STRESS);
> +
> +		igt_assert_f(try_vm_create(fd) != 0,
> +			     "Device did not wedge after injected GT reset failure\n");
> +
> +		drm_close_driver(fd);

Now fault_inject_fd becomes stale.

> +		igt_kmod_rebind("xe", pci_slot);

After rebind there is no point in restoring params, or do I miss
something?

Regards,
Kamil

> +		fd = drm_open_driver(DRIVER_XE);
> +
> +		igt_assert_f(try_vm_create(fd) == 0,
> +			     "Device not functional after rebind recovery\n");
> +	}
> +
>  	igt_subtest("gt-mocs-reset")
>  		xe_for_each_gt(fd, gt)
>  			gt_mocs_reset(fd, gt);
> -- 
> 2.43.0
> 

[PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[nishit.sharma]

From: Nishit Sharma <nishit.sharma@intel.com>

Inject a GT reset failure via the KMD fail_gt_reset debugfs hook, verify
the device wedges as expected, tolerate the resulting -ECANCELED errors in
the submitting threads, then recover by rebind and confirm the driver is
usable again.

Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
---
 tests/intel/xe_exec_reset.c | 136 ++++++++++++++++++++++++++++++++++--
 1 file changed, 131 insertions(+), 5 deletions(-)

diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
index 6eda71c32..5c5857b25 100644
--- a/tests/intel/xe_exec_reset.c
+++ b/tests/intel/xe_exec_reset.c
@@ -15,6 +15,8 @@
 #include <fcntl.h>
 
 #include "igt.h"
+#include "igt_device.h"
+#include "igt_kmod.h"
 #include "igt_sysfs.h"
 #include "lib/igt_syncobj.h"
 #include "lib/intel_reg.h"
@@ -140,6 +142,7 @@ static void test_spin(int fd, struct drm_xe_engine_class_instance *eci,
 #define DESTROY_VM_CTX_STRESS		(0x1 << 20)
 #define MIXED_ENGINE_STRESS		(0x1 << 21)
 #define PM_TRANSITION_STRESS		(0x1 << 22)
+#define FAULT_INJECT_STRESS		(0x1 << 23)
 
 /**
  * SUBTEST: %s-cat-error
@@ -760,7 +763,7 @@ static void submit_jobs(struct gt_thread_data *t)
 	uint32_t pressure_bos[PRESSURE_COUNT];
 	uint32_t *data;
 	int pressure_count;
-	int i = 0;
+	int i = 0, exec_ret;
 
 	bo = xe_bo_create(fd, vm, bo_size, vram_if_possible(fd, t->gt),
 			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
@@ -794,8 +797,25 @@ static void submit_jobs(struct gt_thread_data *t)
 			continue;
 		}
 
-		xe_exec(fd, &exec);
-		xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		/*
+		 * Once an injected GT reset failure wedges the device, exec and
+		 * queue teardown return -ECANCELED. That is the expected outcome
+		 * for the fault-injection stress
+		 */
+		if (t->flags & FAULT_INJECT_STRESS) {
+			struct drm_xe_exec_queue_destroy destroy = {
+				.exec_queue_id = exec.exec_queue_id,
+		};
+
+		exec_ret = __xe_exec(fd, &exec);
+		igt_assert_f(exec_ret == 0 || exec_ret == -ECANCELED,
+			     "exec returned unexpected error %d (expected 0 or -ECANCELED)\n",
+			     exec_ret);
+		igt_ioctl(fd, DRM_IOCTL_XE_EXEC_QUEUE_DESTROY, &destroy);
+		} else {
+			xe_exec(fd, &exec);
+			xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		}
 		(*t->num_submit)++;
 
 		if ((t->flags & MEM_PRESSURE_STRESS) && !(i % 128)) {
@@ -829,8 +849,20 @@ static void submit_jobs(struct gt_thread_data *t)
 		pressure_bo_destroy(fd, pressure_bos, PRESSURE_COUNT);
 
 	munmap(data, bo_size);
-	gem_close(fd, bo);
-	xe_vm_destroy(fd, vm);
+	/*
+	 * On a device wedged by injected GT reset failures, BO close and VM
+	 * destroy also return -ECANCELED.
+	 */
+	if (t->flags & FAULT_INJECT_STRESS) {
+		struct drm_gem_close close_bo = { .handle = bo };
+		struct drm_xe_vm_destroy vm_destroy = { .vm_id = vm };
+
+		igt_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
+		igt_ioctl(fd, DRM_IOCTL_XE_VM_DESTROY, &vm_destroy);
+	} else {
+		gem_close(fd, bo);
+		xe_vm_destroy(fd, vm);
+	}
 }
 
 static void *gt_reset_thread(void *data)
@@ -850,6 +882,60 @@ static void *gt_reset_thread(void *data)
 	return NULL;
 }
 
+static int fault_inject_fd = -1;
+
+static void gt_reset_disable_fault_injection(int sig)
+{
+	if (fault_inject_fd < 0)
+		return;
+
+	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/probability", "0");
+	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/times", "1");
+	fault_inject_fd = -1;
+}
+
+static void gt_reset_enable_fault_injection(int fd)
+{
+	static bool exit_handler_installed;
+
+	fault_inject_fd = fd;
+
+	if (!exit_handler_installed) {
+		igt_install_exit_handler(gt_reset_disable_fault_injection);
+		exit_handler_installed = true;
+	}
+
+	igt_debugfs_write(fd, "fail_gt_reset/probability", "100");
+	igt_debugfs_write(fd, "fail_gt_reset/times", "2");
+}
+
+static void gt_reset_fault_injection_forget_fd(int fd)
+{
+	if (fault_inject_fd == fd)
+		fault_inject_fd = -1;
+}
+
+static int try_vm_create(int fd)
+{
+	struct drm_xe_vm_create create = { 0 };
+	int err = 0;
+
+	if (igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create))
+		err = -errno;
+	else
+		xe_vm_destroy(fd, create.vm_id);
+
+	return err;
+}
+
+static void ignore_gt_reset_fault_dmesg(void)
+{
+	igt_emit_ignore_dmesg_regex("reset failed \\(-ECANCELED\\)"
+				    "|declared device .* as wedged"
+				    "|GPU HANG"
+				    "|Failed to reset");
+}
+
 /**
  * SUBTEST: gt-reset-stress
  * Description: Stress GT reset
@@ -891,6 +977,9 @@ static void *gt_reset_thread(void *data)
  * Description: Test GT reset while long spinner workload is active
  * Test category: stress test
  *
+ * SUBTEST: gt-reset-fault-injection
+ * Description: Stress concurrent GT resets and job submissions with GT reset failures injected via debugfs
+ * Test category: fault injection
  */
 static void
 gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
@@ -907,6 +996,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	pthread_mutex_init(&mutex, 0);
 	pthread_cond_init(&cond, 0);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_enable_fault_injection(fd);
+
 	for (i = 0; i < n_threads; ++i) {
 		threads[i].mutex = &mutex;
 		threads[i].cond = &cond;
@@ -940,6 +1032,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	igt_info("number of resets %d, submissions %d, submit fails %d vm_recreate %d\n",
 		 num_reset, num_submit, num_submit_fail, num_vm_recreate);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_disable_fault_injection(0);
+
 	igt_assert_neq(num_reset, 0);
 	igt_assert_neq(num_submit, 0);
 	free(threads);
@@ -1122,6 +1217,7 @@ int igt_main()
 	int gt;
 	int class;
 	int fd;
+	char pci_slot[NAME_MAX];
 
 	igt_fixture()
 		fd = drm_open_driver(DRIVER_XE);
@@ -1326,6 +1422,36 @@ int igt_main()
 			break;
 		}
 
+	igt_subtest("gt-reset-fault-injection") {
+		igt_require_f(igt_debugfs_exists(fd, "fail_gt_reset/probability",
+						 O_RDWR),
+			      "GT reset fault injection not available; "
+			      "CONFIG_DRM_XE_KUNIT_TEST/fault-injection must be "
+			      "enabled in the KMD\n");
+
+		igt_device_get_pci_slot_name(fd, pci_slot);
+		ignore_gt_reset_fault_dmesg();
+
+		gt_reset(fd, 0, 8, 2, FAULT_INJECT_STRESS);
+
+		igt_assert_f(try_vm_create(fd) != 0,
+			     "Device did not wedge after injected GT reset failure\n");
+
+		/*
+		 * The device is about to be rebind, which recreates the debugfs
+		 * fault-injection state from scratch - there is nothing to restore
+		 * across the rebind. Dropping now-stale fd so the exit handler
+		 * won't touch a closed descriptor.
+		 */
+		gt_reset_fault_injection_forget_fd(fd);
+		drm_close_driver(fd);
+		igt_kmod_rebind("xe", pci_slot);
+		fd = drm_open_driver(DRIVER_XE);
+
+		igt_assert_f(try_vm_create(fd) == 0,
+			     "Device not functional after rebind recovery\n");
+	}
+
 	igt_subtest("gt-mocs-reset")
 		xe_for_each_gt(fd, gt)
 			gt_mocs_reset(fd, gt);
-- 
2.43.0

Re: [PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[Kamil Konieczny]

Hi nishit.sharma,
On 2026-09-01 at 14:01:31 +0000, nishit.sharma@intel.com wrote:
> From: Nishit Sharma <nishit.sharma@intel.com>
> 
> Inject a GT reset failure via the KMD fail_gt_reset debugfs hook, verify
> the device wedges as expected, tolerate the resulting -ECANCELED errors in
> the submitting threads, then recover by rebind and confirm the driver is
> usable again.
> 
> Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
> ---
>  tests/intel/xe_exec_reset.c | 136 ++++++++++++++++++++++++++++++++++--
>  1 file changed, 131 insertions(+), 5 deletions(-)
> 
> diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
> index 6eda71c32..5c5857b25 100644
> --- a/tests/intel/xe_exec_reset.c
> +++ b/tests/intel/xe_exec_reset.c
> @@ -15,6 +15,8 @@
>  #include <fcntl.h>
>  
>  #include "igt.h"
> +#include "igt_device.h"
> +#include "igt_kmod.h"
>  #include "igt_sysfs.h"
>  #include "lib/igt_syncobj.h"
>  #include "lib/intel_reg.h"
> @@ -140,6 +142,7 @@ static void test_spin(int fd, struct drm_xe_engine_class_instance *eci,
>  #define DESTROY_VM_CTX_STRESS		(0x1 << 20)
>  #define MIXED_ENGINE_STRESS		(0x1 << 21)
>  #define PM_TRANSITION_STRESS		(0x1 << 22)
> +#define FAULT_INJECT_STRESS		(0x1 << 23)
>  
>  /**
>   * SUBTEST: %s-cat-error
> @@ -760,7 +763,7 @@ static void submit_jobs(struct gt_thread_data *t)
>  	uint32_t pressure_bos[PRESSURE_COUNT];
>  	uint32_t *data;
>  	int pressure_count;
> -	int i = 0;
> +	int i = 0, exec_ret;
>  
>  	bo = xe_bo_create(fd, vm, bo_size, vram_if_possible(fd, t->gt),
>  			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
> @@ -794,8 +797,25 @@ static void submit_jobs(struct gt_thread_data *t)
>  			continue;
>  		}
>  
> -		xe_exec(fd, &exec);
> -		xe_exec_queue_destroy(fd, exec.exec_queue_id);
> +		/*
> +		 * Once an injected GT reset failure wedges the device, exec and
> +		 * queue teardown return -ECANCELED. That is the expected outcome
> +		 * for the fault-injection stress
> +		 */
> +		if (t->flags & FAULT_INJECT_STRESS) {
> +			struct drm_xe_exec_queue_destroy destroy = {
> +				.exec_queue_id = exec.exec_queue_id,
> +		};
> +
> +		exec_ret = __xe_exec(fd, &exec);
> +		igt_assert_f(exec_ret == 0 || exec_ret == -ECANCELED,
> +			     "exec returned unexpected error %d (expected 0 or -ECANCELED)\n",
> +			     exec_ret);
> +		igt_ioctl(fd, DRM_IOCTL_XE_EXEC_QUEUE_DESTROY, &destroy);
> +		} else {
> +			xe_exec(fd, &exec);
> +			xe_exec_queue_destroy(fd, exec.exec_queue_id);
> +		}
>  		(*t->num_submit)++;
>  
>  		if ((t->flags & MEM_PRESSURE_STRESS) && !(i % 128)) {
> @@ -829,8 +849,20 @@ static void submit_jobs(struct gt_thread_data *t)
>  		pressure_bo_destroy(fd, pressure_bos, PRESSURE_COUNT);
>  
>  	munmap(data, bo_size);
> -	gem_close(fd, bo);
> -	xe_vm_destroy(fd, vm);
> +	/*
> +	 * On a device wedged by injected GT reset failures, BO close and VM
> +	 * destroy also return -ECANCELED.
> +	 */
> +	if (t->flags & FAULT_INJECT_STRESS) {
> +		struct drm_gem_close close_bo = { .handle = bo };
> +		struct drm_xe_vm_destroy vm_destroy = { .vm_id = vm };
> +
> +		igt_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
> +		igt_ioctl(fd, DRM_IOCTL_XE_VM_DESTROY, &vm_destroy);
> +	} else {
> +		gem_close(fd, bo);
> +		xe_vm_destroy(fd, vm);
> +	}
>  }
>  
>  static void *gt_reset_thread(void *data)
> @@ -850,6 +882,60 @@ static void *gt_reset_thread(void *data)
>  	return NULL;
>  }
>  
> +static int fault_inject_fd = -1;
> +
> +static void gt_reset_disable_fault_injection(int sig)
> +{
> +	if (fault_inject_fd < 0)
> +		return;
> +
> +	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/probability", "0");
> +	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/times", "1");
> +	fault_inject_fd = -1;
> +}
> +
> +static void gt_reset_enable_fault_injection(int fd)
> +{
> +	static bool exit_handler_installed;
> +
> +	fault_inject_fd = fd;
> +
> +	if (!exit_handler_installed) {
> +		igt_install_exit_handler(gt_reset_disable_fault_injection);
> +		exit_handler_installed = true;
> +	}
> +
> +	igt_debugfs_write(fd, "fail_gt_reset/probability", "100");
> +	igt_debugfs_write(fd, "fail_gt_reset/times", "2");
> +}
> +
> +static void gt_reset_fault_injection_forget_fd(int fd)
> +{
> +	if (fault_inject_fd == fd)
> +		fault_inject_fd = -1;
> +}

Why new function? imho call disable just before closing fd,
see below.

> +
> +static int try_vm_create(int fd)
> +{
> +	struct drm_xe_vm_create create = { 0 };
> +	int err = 0;
> +
> +	if (igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create))
> +		err = -errno;
> +	else
> +		xe_vm_destroy(fd, create.vm_id);
> +
> +	return err;
> +}
> +
> +static void ignore_gt_reset_fault_dmesg(void)
> +{
> +	igt_emit_ignore_dmesg_regex("reset failed \\(-ECANCELED\\)"
> +				    "|declared device .* as wedged"
> +				    "|GPU HANG"
> +				    "|Failed to reset");
> +}
> +
>  /**
>   * SUBTEST: gt-reset-stress
>   * Description: Stress GT reset
> @@ -891,6 +977,9 @@ static void *gt_reset_thread(void *data)
>   * Description: Test GT reset while long spinner workload is active
>   * Test category: stress test
>   *
> + * SUBTEST: gt-reset-fault-injection
> + * Description: Stress concurrent GT resets and job submissions with GT reset failures injected via debugfs
> + * Test category: fault injection
>   */
>  static void
>  gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
> @@ -907,6 +996,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
>  	pthread_mutex_init(&mutex, 0);
>  	pthread_cond_init(&cond, 0);
>  
> +	if (flags & FAULT_INJECT_STRESS)
> +		gt_reset_enable_fault_injection(fd);
> +
>  	for (i = 0; i < n_threads; ++i) {
>  		threads[i].mutex = &mutex;
>  		threads[i].cond = &cond;
> @@ -940,6 +1032,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
>  	igt_info("number of resets %d, submissions %d, submit fails %d vm_recreate %d\n",
>  		 num_reset, num_submit, num_submit_fail, num_vm_recreate);
>  
> +	if (flags & FAULT_INJECT_STRESS)
> +		gt_reset_disable_fault_injection(0);
> +
>  	igt_assert_neq(num_reset, 0);
>  	igt_assert_neq(num_submit, 0);
>  	free(threads);
> @@ -1122,6 +1217,7 @@ int igt_main()
>  	int gt;
>  	int class;
>  	int fd;
> +	char pci_slot[NAME_MAX];
>  
>  	igt_fixture()
>  		fd = drm_open_driver(DRIVER_XE);
> @@ -1326,6 +1422,36 @@ int igt_main()
>  			break;
>  		}
>  
> +	igt_subtest("gt-reset-fault-injection") {
> +		igt_require_f(igt_debugfs_exists(fd, "fail_gt_reset/probability",
> +						 O_RDWR),
> +			      "GT reset fault injection not available; "
> +			      "CONFIG_DRM_XE_KUNIT_TEST/fault-injection must be "
> +			      "enabled in the KMD\n");
> +
> +		igt_device_get_pci_slot_name(fd, pci_slot);
> +		ignore_gt_reset_fault_dmesg();
> +
> +		gt_reset(fd, 0, 8, 2, FAULT_INJECT_STRESS);
> +
> +		igt_assert_f(try_vm_create(fd) != 0,
> +			     "Device did not wedge after injected GT reset failure\n");
> +
> +		/*
> +		 * The device is about to be rebind, which recreates the debugfs
> +		 * fault-injection state from scratch - there is nothing to restore
> +		 * across the rebind. Dropping now-stale fd so the exit handler
> +		 * won't touch a closed descriptor.

You could write that disabling is done here, in case if
any unexpected signal happen.

> +		 */
> +		gt_reset_fault_injection_forget_fd(fd);

imho just call
		gt_reset_disable_fault_injection(0);

Rest looks good.

Regards,
Kamil

> +		drm_close_driver(fd);
> +		igt_kmod_rebind("xe", pci_slot);
> +		fd = drm_open_driver(DRIVER_XE);
> +
> +		igt_assert_f(try_vm_create(fd) == 0,
> +			     "Device not functional after rebind recovery\n");
> +	}
> +
>  	igt_subtest("gt-mocs-reset")
>  		xe_for_each_gt(fd, gt)
>  			gt_mocs_reset(fd, gt);
> -- 
> 2.43.0
> 

[PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[nishit.sharma]

From: Nishit Sharma <nishit.sharma@intel.com>

Inject a GT reset failure via the KMD fail_gt_reset debugfs hook, verify
the device wedges as expected, tolerate the resulting -ECANCELED errors in
the submitting threads, then recover by rebind and confirm the driver is
usable again.

Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
---
 tests/intel/xe_exec_reset.c | 124 ++++++++++++++++++++++++++++++++++--
 1 file changed, 119 insertions(+), 5 deletions(-)

diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
index 6eda71c32..f0071cc67 100644
--- a/tests/intel/xe_exec_reset.c
+++ b/tests/intel/xe_exec_reset.c
@@ -15,6 +15,8 @@
 #include <fcntl.h>
 
 #include "igt.h"
+#include "igt_device.h"
+#include "igt_kmod.h"
 #include "igt_sysfs.h"
 #include "lib/igt_syncobj.h"
 #include "lib/intel_reg.h"
@@ -140,6 +142,7 @@ static void test_spin(int fd, struct drm_xe_engine_class_instance *eci,
 #define DESTROY_VM_CTX_STRESS		(0x1 << 20)
 #define MIXED_ENGINE_STRESS		(0x1 << 21)
 #define PM_TRANSITION_STRESS		(0x1 << 22)
+#define FAULT_INJECT_STRESS		(0x1 << 23)
 
 /**
  * SUBTEST: %s-cat-error
@@ -760,7 +763,7 @@ static void submit_jobs(struct gt_thread_data *t)
 	uint32_t pressure_bos[PRESSURE_COUNT];
 	uint32_t *data;
 	int pressure_count;
-	int i = 0;
+	int i = 0, exec_ret;
 
 	bo = xe_bo_create(fd, vm, bo_size, vram_if_possible(fd, t->gt),
 			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
@@ -794,8 +797,25 @@ static void submit_jobs(struct gt_thread_data *t)
 			continue;
 		}
 
-		xe_exec(fd, &exec);
-		xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		/*
+		 * Once an injected GT reset failure wedges the device, exec and
+		 * queue teardown return -ECANCELED. That is the expected outcome
+		 * for the fault-injection stress
+		 */
+		if (t->flags & FAULT_INJECT_STRESS) {
+			struct drm_xe_exec_queue_destroy destroy = {
+				.exec_queue_id = exec.exec_queue_id,
+		};
+
+		exec_ret = __xe_exec(fd, &exec);
+		igt_assert_f(exec_ret == 0 || exec_ret == -ECANCELED,
+			     "exec returned unexpected error %d (expected 0 or -ECANCELED)\n",
+			     exec_ret);
+		igt_ioctl(fd, DRM_IOCTL_XE_EXEC_QUEUE_DESTROY, &destroy);
+		} else {
+			xe_exec(fd, &exec);
+			xe_exec_queue_destroy(fd, exec.exec_queue_id);
+		}
 		(*t->num_submit)++;
 
 		if ((t->flags & MEM_PRESSURE_STRESS) && !(i % 128)) {
@@ -829,8 +849,20 @@ static void submit_jobs(struct gt_thread_data *t)
 		pressure_bo_destroy(fd, pressure_bos, PRESSURE_COUNT);
 
 	munmap(data, bo_size);
-	gem_close(fd, bo);
-	xe_vm_destroy(fd, vm);
+	/*
+	 * On a device wedged by injected GT reset failures, BO close and VM
+	 * destroy also return -ECANCELED.
+	 */
+	if (t->flags & FAULT_INJECT_STRESS) {
+		struct drm_gem_close close_bo = { .handle = bo };
+		struct drm_xe_vm_destroy vm_destroy = { .vm_id = vm };
+
+		igt_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
+		igt_ioctl(fd, DRM_IOCTL_XE_VM_DESTROY, &vm_destroy);
+	} else {
+		gem_close(fd, bo);
+		xe_vm_destroy(fd, vm);
+	}
 }
 
 static void *gt_reset_thread(void *data)
@@ -850,6 +882,54 @@ static void *gt_reset_thread(void *data)
 	return NULL;
 }
 
+static int fault_inject_fd = -1;
+
+static void gt_reset_disable_fault_injection(int sig)
+{
+	if (fault_inject_fd < 0)
+		return;
+
+	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/probability", "0");
+	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/times", "1");
+	fault_inject_fd = -1;
+}
+
+static void gt_reset_enable_fault_injection(int fd)
+{
+	static bool exit_handler_installed;
+
+	fault_inject_fd = fd;
+
+	if (!exit_handler_installed) {
+		igt_install_exit_handler(gt_reset_disable_fault_injection);
+		exit_handler_installed = true;
+	}
+
+	igt_debugfs_write(fd, "fail_gt_reset/probability", "100");
+	igt_debugfs_write(fd, "fail_gt_reset/times", "2");
+}
+
+static int try_vm_create(int fd)
+{
+	struct drm_xe_vm_create create = { 0 };
+	int err = 0;
+
+	if (igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create))
+		err = -errno;
+	else
+		xe_vm_destroy(fd, create.vm_id);
+
+	return err;
+}
+
+static void ignore_gt_reset_fault_dmesg(void)
+{
+	igt_emit_ignore_dmesg_regex("reset failed \\(-ECANCELED\\)"
+				    "|declared device .* as wedged"
+				    "|GPU HANG"
+				    "|Failed to reset");
+}
+
 /**
  * SUBTEST: gt-reset-stress
  * Description: Stress GT reset
@@ -891,6 +971,9 @@ static void *gt_reset_thread(void *data)
  * Description: Test GT reset while long spinner workload is active
  * Test category: stress test
  *
+ * SUBTEST: gt-reset-fault-injection
+ * Description: Stress concurrent GT resets and job submissions with GT reset failures injected via debugfs
+ * Test category: fault injection
  */
 static void
 gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
@@ -907,6 +990,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	pthread_mutex_init(&mutex, 0);
 	pthread_cond_init(&cond, 0);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_enable_fault_injection(fd);
+
 	for (i = 0; i < n_threads; ++i) {
 		threads[i].mutex = &mutex;
 		threads[i].cond = &cond;
@@ -940,6 +1026,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
 	igt_info("number of resets %d, submissions %d, submit fails %d vm_recreate %d\n",
 		 num_reset, num_submit, num_submit_fail, num_vm_recreate);
 
+	if (flags & FAULT_INJECT_STRESS)
+		gt_reset_disable_fault_injection(0);
+
 	igt_assert_neq(num_reset, 0);
 	igt_assert_neq(num_submit, 0);
 	free(threads);
@@ -1122,6 +1211,7 @@ int igt_main()
 	int gt;
 	int class;
 	int fd;
+	char pci_slot[NAME_MAX];
 
 	igt_fixture()
 		fd = drm_open_driver(DRIVER_XE);
@@ -1326,6 +1416,30 @@ int igt_main()
 			break;
 		}
 
+	igt_subtest("gt-reset-fault-injection") {
+		igt_require_f(igt_debugfs_exists(fd, "fail_gt_reset/probability",
+						 O_RDWR),
+			      "GT reset fault injection not available; "
+			      "CONFIG_DRM_XE_KUNIT_TEST/fault-injection must be "
+			      "enabled in the KMD\n");
+
+		igt_device_get_pci_slot_name(fd, pci_slot);
+		ignore_gt_reset_fault_dmesg();
+
+		gt_reset(fd, 0, 8, 2, FAULT_INJECT_STRESS);
+
+		igt_assert_f(try_vm_create(fd) != 0,
+			     "Device did not wedge after injected GT reset failure\n");
+
+		gt_reset_disable_fault_injection(0);
+		drm_close_driver(fd);
+		igt_kmod_rebind("xe", pci_slot);
+		fd = drm_open_driver(DRIVER_XE);
+
+		igt_assert_f(try_vm_create(fd) == 0,
+			     "Device not functional after rebind recovery\n");
+	}
+
 	igt_subtest("gt-mocs-reset")
 		xe_for_each_gt(fd, gt)
 			gt_mocs_reset(fd, gt);
-- 
2.43.0

Re: [PATCH] tests/intel/xe_exec_reset: add GT reset fault injection stress coverage

[Kamil Konieczny]

Hi nishit.sharma,
On 2026-09-02 at 03:33:15 +0000, nishit.sharma@intel.com wrote:
> From: Nishit Sharma <nishit.sharma@intel.com>
> 
> Inject a GT reset failure via the KMD fail_gt_reset debugfs hook, verify
> the device wedges as expected, tolerate the resulting -ECANCELED errors in
> the submitting threads, then recover by rebind and confirm the driver is
> usable again.
> 
> Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
> ---
>  tests/intel/xe_exec_reset.c | 124 ++++++++++++++++++++++++++++++++++--
>  1 file changed, 119 insertions(+), 5 deletions(-)
> 
> diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
> index 6eda71c32..f0071cc67 100644
> --- a/tests/intel/xe_exec_reset.c
> +++ b/tests/intel/xe_exec_reset.c
> @@ -15,6 +15,8 @@
>  #include <fcntl.h>
>  
>  #include "igt.h"
> +#include "igt_device.h"
> +#include "igt_kmod.h"
>  #include "igt_sysfs.h"
>  #include "lib/igt_syncobj.h"
>  #include "lib/intel_reg.h"
> @@ -140,6 +142,7 @@ static void test_spin(int fd, struct drm_xe_engine_class_instance *eci,
>  #define DESTROY_VM_CTX_STRESS		(0x1 << 20)
>  #define MIXED_ENGINE_STRESS		(0x1 << 21)
>  #define PM_TRANSITION_STRESS		(0x1 << 22)
> +#define FAULT_INJECT_STRESS		(0x1 << 23)
>  
>  /**
>   * SUBTEST: %s-cat-error
> @@ -760,7 +763,7 @@ static void submit_jobs(struct gt_thread_data *t)
>  	uint32_t pressure_bos[PRESSURE_COUNT];
>  	uint32_t *data;
>  	int pressure_count;
> -	int i = 0;
> +	int i = 0, exec_ret;
>  
>  	bo = xe_bo_create(fd, vm, bo_size, vram_if_possible(fd, t->gt),
>  			  DRM_XE_GEM_CREATE_FLAG_NEEDS_VISIBLE_VRAM);
> @@ -794,8 +797,25 @@ static void submit_jobs(struct gt_thread_data *t)
>  			continue;
>  		}
>  
> -		xe_exec(fd, &exec);
> -		xe_exec_queue_destroy(fd, exec.exec_queue_id);
> +		/*
> +		 * Once an injected GT reset failure wedges the device, exec and
> +		 * queue teardown return -ECANCELED. That is the expected outcome
> +		 * for the fault-injection stress
> +		 */
> +		if (t->flags & FAULT_INJECT_STRESS) {
> +			struct drm_xe_exec_queue_destroy destroy = {
> +				.exec_queue_id = exec.exec_queue_id,
> +		};

This seems a break in formatting, interesting it wasn't catched
by checkpatch.pl

> +
> +		exec_ret = __xe_exec(fd, &exec);
> +		igt_assert_f(exec_ret == 0 || exec_ret == -ECANCELED,
> +			     "exec returned unexpected error %d (expected 0 or -ECANCELED)\n",
> +			     exec_ret);
> +		igt_ioctl(fd, DRM_IOCTL_XE_EXEC_QUEUE_DESTROY, &destroy);

Above should be shifted to right by one tab, to align
with below 'else'. It could be corrected at merge time so

Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>

Regards,
Kamil

> +		} else {
> +			xe_exec(fd, &exec);
> +			xe_exec_queue_destroy(fd, exec.exec_queue_id);
> +		}
>  		(*t->num_submit)++;
>  
>  		if ((t->flags & MEM_PRESSURE_STRESS) && !(i % 128)) {
> @@ -829,8 +849,20 @@ static void submit_jobs(struct gt_thread_data *t)
>  		pressure_bo_destroy(fd, pressure_bos, PRESSURE_COUNT);
>  
>  	munmap(data, bo_size);
> -	gem_close(fd, bo);
> -	xe_vm_destroy(fd, vm);
> +	/*
> +	 * On a device wedged by injected GT reset failures, BO close and VM
> +	 * destroy also return -ECANCELED.
> +	 */
> +	if (t->flags & FAULT_INJECT_STRESS) {
> +		struct drm_gem_close close_bo = { .handle = bo };
> +		struct drm_xe_vm_destroy vm_destroy = { .vm_id = vm };
> +
> +		igt_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo);
> +		igt_ioctl(fd, DRM_IOCTL_XE_VM_DESTROY, &vm_destroy);
> +	} else {
> +		gem_close(fd, bo);
> +		xe_vm_destroy(fd, vm);
> +	}
>  }
>  
>  static void *gt_reset_thread(void *data)
> @@ -850,6 +882,54 @@ static void *gt_reset_thread(void *data)
>  	return NULL;
>  }
>  
> +static int fault_inject_fd = -1;
> +
> +static void gt_reset_disable_fault_injection(int sig)
> +{
> +	if (fault_inject_fd < 0)
> +		return;
> +
> +	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/probability", "0");
> +	igt_debugfs_write(fault_inject_fd, "fail_gt_reset/times", "1");
> +	fault_inject_fd = -1;
> +}
> +
> +static void gt_reset_enable_fault_injection(int fd)
> +{
> +	static bool exit_handler_installed;
> +
> +	fault_inject_fd = fd;
> +
> +	if (!exit_handler_installed) {
> +		igt_install_exit_handler(gt_reset_disable_fault_injection);
> +		exit_handler_installed = true;
> +	}
> +
> +	igt_debugfs_write(fd, "fail_gt_reset/probability", "100");
> +	igt_debugfs_write(fd, "fail_gt_reset/times", "2");
> +}
> +
> +static int try_vm_create(int fd)
> +{
> +	struct drm_xe_vm_create create = { 0 };
> +	int err = 0;
> +
> +	if (igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create))
> +		err = -errno;
> +	else
> +		xe_vm_destroy(fd, create.vm_id);
> +
> +	return err;
> +}
> +
> +static void ignore_gt_reset_fault_dmesg(void)
> +{
> +	igt_emit_ignore_dmesg_regex("reset failed \\(-ECANCELED\\)"
> +				    "|declared device .* as wedged"
> +				    "|GPU HANG"
> +				    "|Failed to reset");
> +}
> +
>  /**
>   * SUBTEST: gt-reset-stress
>   * Description: Stress GT reset
> @@ -891,6 +971,9 @@ static void *gt_reset_thread(void *data)
>   * Description: Test GT reset while long spinner workload is active
>   * Test category: stress test
>   *
> + * SUBTEST: gt-reset-fault-injection
> + * Description: Stress concurrent GT resets and job submissions with GT reset failures injected via debugfs
> + * Test category: fault injection
>   */
>  static void
>  gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
> @@ -907,6 +990,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
>  	pthread_mutex_init(&mutex, 0);
>  	pthread_cond_init(&cond, 0);
>  
> +	if (flags & FAULT_INJECT_STRESS)
> +		gt_reset_enable_fault_injection(fd);
> +
>  	for (i = 0; i < n_threads; ++i) {
>  		threads[i].mutex = &mutex;
>  		threads[i].cond = &cond;
> @@ -940,6 +1026,9 @@ gt_reset(int fd, int gt, int n_threads, int n_sec, unsigned int flags)
>  	igt_info("number of resets %d, submissions %d, submit fails %d vm_recreate %d\n",
>  		 num_reset, num_submit, num_submit_fail, num_vm_recreate);
>  
> +	if (flags & FAULT_INJECT_STRESS)
> +		gt_reset_disable_fault_injection(0);
> +
>  	igt_assert_neq(num_reset, 0);
>  	igt_assert_neq(num_submit, 0);
>  	free(threads);
> @@ -1122,6 +1211,7 @@ int igt_main()
>  	int gt;
>  	int class;
>  	int fd;
> +	char pci_slot[NAME_MAX];
>  
>  	igt_fixture()
>  		fd = drm_open_driver(DRIVER_XE);
> @@ -1326,6 +1416,30 @@ int igt_main()
>  			break;
>  		}
>  
> +	igt_subtest("gt-reset-fault-injection") {
> +		igt_require_f(igt_debugfs_exists(fd, "fail_gt_reset/probability",
> +						 O_RDWR),
> +			      "GT reset fault injection not available; "
> +			      "CONFIG_DRM_XE_KUNIT_TEST/fault-injection must be "
> +			      "enabled in the KMD\n");
> +
> +		igt_device_get_pci_slot_name(fd, pci_slot);
> +		ignore_gt_reset_fault_dmesg();
> +
> +		gt_reset(fd, 0, 8, 2, FAULT_INJECT_STRESS);
> +
> +		igt_assert_f(try_vm_create(fd) != 0,
> +			     "Device did not wedge after injected GT reset failure\n");
> +
> +		gt_reset_disable_fault_injection(0);
> +		drm_close_driver(fd);
> +		igt_kmod_rebind("xe", pci_slot);
> +		fd = drm_open_driver(DRIVER_XE);
> +
> +		igt_assert_f(try_vm_create(fd) == 0,
> +			     "Device not functional after rebind recovery\n");
> +	}
> +
>  	igt_subtest("gt-mocs-reset")
>  		xe_for_each_gt(fd, gt)
>  			gt_mocs_reset(fd, gt);
> -- 
> 2.43.0
>