drm/amdgpu: Check fence emitted count to identify bad jobs

In SRIOV, when host driver performs MODE 1 reset and notifies FLR to
guest driver, there is a small chance that there is no job running on hw
but the driver has not updated the pending list yet, causing the driver
not respond the FLR request. Modify the has_job_running function to
make sure if there is still running job.

v2: Use amdgpu_fence_count_emitted to determine job running status.
v3: Remove the timeout wait in has_job_running

Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Signed-off-by: Shikang Fan <shikang.fan@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 6 insertions, 8 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 312c507ef5f9..07c84e4cef5a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -5238,16 +5238,18 @@ static int amdgpu_device_reset_sriov(struct amdgpu_device *adev,
 }
 
 /**
- * amdgpu_device_has_job_running - check if there is any job in mirror list
+ * amdgpu_device_has_job_running - check if there is any unfinished job
  *
  * @adev: amdgpu_device pointer
  *
- * check if there is any job in mirror list
+ * check if there is any job running on the device when guest driver receives
+ * FLR notification from host driver. If there are still jobs running, then
+ * the guest driver will not respond the FLR reset. Instead, let the job hit
+ * the timeout and guest driver then issue the reset request.
  */
 bool amdgpu_device_has_job_running(struct amdgpu_device *adev)
 {
 	int i;
-	struct drm_sched_job *job;
 
 	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 		struct amdgpu_ring *ring = adev->rings[i];
@@ -5255,11 +5257,7 @@ bool amdgpu_device_has_job_running(struct amdgpu_device *adev)
 		if (!amdgpu_ring_sched_ready(ring))
 			continue;
 
-		spin_lock(&ring->sched.job_list_lock);
-		job = list_first_entry_or_null(&ring->sched.pending_list,
-					       struct drm_sched_job, list);
-		spin_unlock(&ring->sched.job_list_lock);
-		if (job)
+		if (amdgpu_fence_count_emitted(ring))
 			return true;
 	}
 	return false;