Align refcount behaviour for amdgpu_job embedded HW fence with
classic pointer style HW fences by increasing refcount each
time emit is called so amdgpu code doesn't need to make workarounds
using amdgpu_job.job_run_counter to keep the HW fence refcount balanced.
Also since in the previous patch we resumed setting s_fence->parent to NULL
in drm_sched_stop switch to directly checking if job->hw_fence is
signaled to short circuit reset if already signed.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
Tested-by: Yiqing Yao <yiqing.yao@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c | 2 ++
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 23 ++++++++++++++++------
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 7 ++++++-
drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 4 ----
4 files changed, 25 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
index 513c57f839d8..447bd92c4856 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
@@ -684,6 +684,8 @@ int amdgpu_amdkfd_submit_ib(struct amdgpu_device *adev,
goto err_ib_sched;
}
+ /* Drop the initial kref_init count (see drm_sched_main as example) */
+ dma_fence_put(f);
ret = dma_fence_wait(f, false);
err_ib_sched:
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index c99541685804..f9718119834f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -5009,16 +5009,28 @@ static void amdgpu_device_recheck_guilty_jobs(
/* clear job's guilty and depend the folowing step to decide the real one */
drm_sched_reset_karma(s_job);
- /* for the real bad job, it will be resubmitted twice, adding a dma_fence_get
- * to make sure fence is balanced */
- dma_fence_get(s_job->s_fence->parent);
drm_sched_resubmit_jobs_ext(&ring->sched, 1);
+ if (!s_job->s_fence->parent) {
+ DRM_WARN("Failed to get a HW fence for job!");
+ continue;
+ }
+
ret = dma_fence_wait_timeout(s_job->s_fence->parent, false, ring->sched.timeout);
if (ret == 0) { /* timeout */
DRM_ERROR("Found the real bad job! ring:%s, job_id:%llx\n",
ring->sched.name, s_job->id);
+
+ /* Clear this failed job from fence array */
+ amdgpu_fence_driver_clear_job_fences(ring);
+
+ /* Since the job won't signal and we go for
+ * another resubmit drop this parent pointer
+ */
+ dma_fence_put(s_job->s_fence->parent);
+ s_job->s_fence->parent = NULL;
+
/* set guilty */
drm_sched_increase_karma(s_job);
retry:
@@ -5047,7 +5059,6 @@ static void amdgpu_device_recheck_guilty_jobs(
/* got the hw fence, signal finished fence */
atomic_dec(ring->sched.score);
- dma_fence_put(s_job->s_fence->parent);
dma_fence_get(&s_job->s_fence->finished);
dma_fence_signal(&s_job->s_fence->finished);
dma_fence_put(&s_job->s_fence->finished);
@@ -5220,8 +5231,8 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
*
* job->base holds a reference to parent fence
*/
- if (job && job->base.s_fence->parent &&
- dma_fence_is_signaled(job->base.s_fence->parent)) {
+ if (job && (job->hw_fence.ops != NULL) &&
+ dma_fence_is_signaled(&job->hw_fence)) {
job_signaled = true;
dev_info(adev->dev, "Guilty job already signaled, skipping HW reset");
goto skip_hw_reset;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index d6d54ba4c185..9bd4e18212fc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -164,11 +164,16 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, struct amd
if (job && job->job_run_counter) {
/* reinit seq for resubmitted jobs */
fence->seqno = seq;
+ /* TO be inline with external fence creation and other drivers */
+ dma_fence_get(fence);
} else {
- if (job)
+ if (job) {
dma_fence_init(fence, &amdgpu_job_fence_ops,
&ring->fence_drv.lock,
adev->fence_context + ring->idx, seq);
+ /* Against remove in amdgpu_job_{free, free_cb} */
+ dma_fence_get(fence);
+ }
else
dma_fence_init(fence, &amdgpu_fence_ops,
&ring->fence_drv.lock,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index 58568fdde2d0..638e1d600258 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -267,10 +267,6 @@ static struct dma_fence *amdgpu_job_run(struct drm_sched_job *sched_job)
DRM_ERROR("Error scheduling IBs (%d)\n", r);
}
- if (!job->job_run_counter)
- dma_fence_get(fence);
- else if (finished->error < 0)
- dma_fence_put(&job->hw_fence);
job->job_run_counter++;
amdgpu_job_free_resources(job);
--
2.25.1
