Am 24.10.19 um 12:58 schrieb S, Shirish:
[Why]
Upon GPU reset, kernel cleans up already submitted jobs
via drm_sched_cleanup_jobs.
This schedules ib's via drm_sched_main()->run_job, leading to
race condition of rings being ready or not, since during reset
rings may be suspended.
NAK, exactly that's what should not happen.
The scheduler should be suspend while a GPU reset is in progress.
So you are running into a completely different race here.
Please sync up with Andrey how this was able to happen.
Regards,
Christian.
[How]
make GPU reset's amdgpu_device_ip_resume_phase2() &
amdgpu_ib_schedule() in amdgpu_job_run() mutually exclusive.
Signed-off-by: Shirish S <shirish.s@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 +++
drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 2 ++
3 files changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index f4d9041..7b07a47b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -973,6 +973,7 @@ struct amdgpu_device {
bool in_gpu_reset;
enum pp_mp1_state mp1_state;
struct mutex lock_reset;
+ struct mutex lock_ib_sched;
struct amdgpu_doorbell_index doorbell_index;
int asic_reset_res;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 676cad1..63cad74 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2759,6 +2759,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
mutex_init(&adev->virt.vf_errors.lock);
hash_init(adev->mn_hash);
mutex_init(&adev->lock_reset);
+ mutex_init(&adev->lock_ib_sched);
mutex_init(&adev->virt.dpm_mutex);
mutex_init(&adev->psp.mutex);
@@ -3795,7 +3796,9 @@ static int amdgpu_do_asic_reset(struct amdgpu_hive_info *hive,
if (r)
return r;
+ mutex_lock(&tmp_adev->lock_ib_sched);
r = amdgpu_device_ip_resume_phase2(tmp_adev);
+ mutex_unlock(&tmp_adev->lock_ib_sched);
if (r)
goto out;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index e1bad99..cd6082d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -233,8 +233,10 @@ static struct dma_fence *amdgpu_job_run(struct drm_sched_job *sched_job)
if (finished->error < 0) {
DRM_INFO("Skip scheduling IBs!\n");
} else {
+ mutex_lock(&ring->adev->lock_ib_sched);
r = amdgpu_ib_schedule(ring, job->num_ibs, job->ibs, job,
&fence);
+ mutex_unlock(&ring->adev->lock_ib_sched);
if (r)
DRM_ERROR("Error scheduling IBs (%d)\n", r);
}
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