[PATCH v8 6/6] drm/amdgpu: Make use of drm_wedge_task_info

[André Almeida]

To notify userspace about which task (if any) made the device get in a
wedge state, make use of drm_wedge_task_info parameter, filling it with
the task PID and name.

Signed-off-by: André Almeida <andrealmeid@xxxxxxxxxx>
---
v8:
 - Drop check before calling amdgpu_vm_put_task_info()
 - Drop local variable `info`
v7:
 - Remove struct cast, now we can use `info = &ti->task`
 - Fix struct lifetime, move amdgpu_vm_put_task_info() after
   drm_dev_wedged_event() call
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 13 +++++++++++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_job.c    |  7 +++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 8a0f36f33f13..a59f194e3360 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -6363,8 +6363,17 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
 
 	atomic_set(&adev->reset_domain->reset_res, r);
 
-	if (!r)
-		drm_dev_wedged_event(adev_to_drm(adev), DRM_WEDGE_RECOVERY_NONE, NULL);
+	if (!r) {
+		struct amdgpu_task_info *ti = NULL;
+
+		if (job)
+			ti = amdgpu_vm_get_task_info_pasid(adev, job->pasid);
+
+		drm_dev_wedged_event(adev_to_drm(adev), DRM_WEDGE_RECOVERY_NONE,
+				     ti ? &ti->task : NULL);
+
+		amdgpu_vm_put_task_info(ti);
+	}
 
 	return r;
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index 0c1381b527fe..1e24590ae144 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -89,6 +89,7 @@ static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job)
 {
 	struct amdgpu_ring *ring = to_amdgpu_ring(s_job->sched);
 	struct amdgpu_job *job = to_amdgpu_job(s_job);
+	struct drm_wedge_task_info *info = NULL;
 	struct amdgpu_task_info *ti;
 	struct amdgpu_device *adev = ring->adev;
 	int idx;
@@ -125,7 +126,7 @@ static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job)
 	ti = amdgpu_vm_get_task_info_pasid(ring->adev, job->pasid);
 	if (ti) {
 		amdgpu_vm_print_task_info(adev, ti);
-		amdgpu_vm_put_task_info(ti);
+		info = &ti->task;
 	}
 
 	/* attempt a per ring reset */
@@ -164,13 +165,15 @@ static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job)
 			if (amdgpu_ring_sched_ready(ring))
 				drm_sched_start(&ring->sched, 0);
 			dev_err(adev->dev, "Ring %s reset succeeded\n", ring->sched.name);
-			drm_dev_wedged_event(adev_to_drm(adev), DRM_WEDGE_RECOVERY_NONE, NULL);
+			drm_dev_wedged_event(adev_to_drm(adev), DRM_WEDGE_RECOVERY_NONE, info);
 			goto exit;
 		}
 		dev_err(adev->dev, "Ring %s reset failure\n", ring->sched.name);
 	}
 	dma_fence_set_error(&s_job->s_fence->finished, -ETIME);
 
+	amdgpu_vm_put_task_info(ti);
+
 	if (amdgpu_device_should_recover_gpu(ring->adev)) {
 		struct amdgpu_reset_context reset_context;
 		memset(&reset_context, 0, sizeof(reset_context));
-- 
2.49.0