[PATCH v3 3/5] drm/amdgpu: Avoid HW reset if guilty job already signaled.
Andrey Grodzovsky
andrey.grodzovsky at amd.com
Mon Apr 15 19:43:21 UTC 2019
Also reject TDRs if another one already running.
v2:
Stop all schedulers across device and entire XGMI hive before
force signaling HW fences.
Avoid passing job_signaled to helper fnctions to keep all the decision
making about skipping HW reset in one place.
v3:
Fix SW sched. hang after non HW reset. sched.hw_rq_count has to be balanced
against it's decrement in drm_sched_stop in non HW reset case.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 167 +++++++++++++++++++----------
1 file changed, 110 insertions(+), 57 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 8c41a9f..d88a882 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3341,25 +3341,16 @@ static int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
if (!ring || !ring->sched.thread)
continue;
- drm_sched_stop(&ring->sched, &job->base);
-
/* after all hw jobs are reset, hw fence is meaningless, so force_completion */
amdgpu_fence_driver_force_completion(ring);
}
- if(job) {
+ if(job)
drm_sched_increase_karma(&job->base);
- /*
- * Guilty job did complete and hence needs to be manually removed
- * See drm_sched_stop doc.
- */
- if (list_empty(&job->base.node))
- job->base.sched->ops->free_job(&job->base);
- }
-
+ /* Don't suspend on bare metal if we are not going to HW reset the ASIC */
if (!amdgpu_sriov_vf(adev)) {
if (!need_full_reset)
@@ -3497,37 +3488,21 @@ static int amdgpu_do_asic_reset(struct amdgpu_hive_info *hive,
return r;
}
-static void amdgpu_device_post_asic_reset(struct amdgpu_device *adev)
+static bool amdgpu_device_lock_adev(struct amdgpu_device *adev, bool trylock)
{
- int i;
+ if (trylock) {
+ if (!mutex_trylock(&adev->lock_reset))
+ return false;
+ } else
+ mutex_lock(&adev->lock_reset);
- for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
- struct amdgpu_ring *ring = adev->rings[i];
-
- if (!ring || !ring->sched.thread)
- continue;
-
- if (!adev->asic_reset_res)
- drm_sched_resubmit_jobs(&ring->sched);
-
- drm_sched_start(&ring->sched, !adev->asic_reset_res);
- }
-
- if (!amdgpu_device_has_dc_support(adev)) {
- drm_helper_resume_force_mode(adev->ddev);
- }
-
- adev->asic_reset_res = 0;
-}
-
-static void amdgpu_device_lock_adev(struct amdgpu_device *adev)
-{
- mutex_lock(&adev->lock_reset);
atomic_inc(&adev->gpu_reset_counter);
adev->in_gpu_reset = 1;
/* Block kfd: SRIOV would do it separately */
if (!amdgpu_sriov_vf(adev))
amdgpu_amdkfd_pre_reset(adev);
+
+ return true;
}
static void amdgpu_device_unlock_adev(struct amdgpu_device *adev)
@@ -3555,40 +3530,42 @@ static void amdgpu_device_unlock_adev(struct amdgpu_device *adev)
int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
struct amdgpu_job *job)
{
- int r;
+ struct list_head device_list, *device_list_handle = NULL;
+ bool need_full_reset, job_signaled;
struct amdgpu_hive_info *hive = NULL;
- bool need_full_reset = false;
struct amdgpu_device *tmp_adev = NULL;
- struct list_head device_list, *device_list_handle = NULL;
+ int i, r = 0;
+ need_full_reset = job_signaled = false;
INIT_LIST_HEAD(&device_list);
dev_info(adev->dev, "GPU reset begin!\n");
+ hive = amdgpu_get_xgmi_hive(adev, false);
+
/*
- * In case of XGMI hive disallow concurrent resets to be triggered
- * by different nodes. No point also since the one node already executing
- * reset will also reset all the other nodes in the hive.
+ * Here we trylock to avoid chain of resets executing from
+ * either trigger by jobs on different adevs in XGMI hive or jobs on
+ * different schedulers for same device while this TO handler is running.
+ * We always reset all schedulers for device and all devices for XGMI
+ * hive so that should take care of them too.
*/
- hive = amdgpu_get_xgmi_hive(adev, 0);
- if (hive && adev->gmc.xgmi.num_physical_nodes > 1 &&
- !mutex_trylock(&hive->reset_lock))
+
+ if (hive && !mutex_trylock(&hive->reset_lock)) {
+ DRM_INFO("Bailing on TDR for s_job:%llx, hive: %llx as another already in progress",
+ job->base.id, hive->hive_id);
return 0;
+ }
/* Start with adev pre asic reset first for soft reset check.*/
- amdgpu_device_lock_adev(adev);
- r = amdgpu_device_pre_asic_reset(adev,
- job,
- &need_full_reset);
- if (r) {
- /*TODO Should we stop ?*/
- DRM_ERROR("GPU pre asic reset failed with err, %d for drm dev, %s ",
- r, adev->ddev->unique);
- adev->asic_reset_res = r;
+ if (!amdgpu_device_lock_adev(adev, !hive)) {
+ DRM_INFO("Bailing on TDR for s_job:%llx, as another already in progress",
+ job->base.id);
+ return 0;
}
/* Build list of devices to reset */
- if (need_full_reset && adev->gmc.xgmi.num_physical_nodes > 1) {
+ if (adev->gmc.xgmi.num_physical_nodes > 1) {
if (!hive) {
amdgpu_device_unlock_adev(adev);
return -ENODEV;
@@ -3605,13 +3582,56 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
device_list_handle = &device_list;
}
+ /* block all schedulers and reset given job's ring */
+ list_for_each_entry(tmp_adev, device_list_handle, gmc.xgmi.head) {
+ for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
+ struct amdgpu_ring *ring = tmp_adev->rings[i];
+
+ if (!ring || !ring->sched.thread)
+ continue;
+
+ drm_sched_stop(&ring->sched, &job->base);
+ }
+ }
+
+
+ /*
+ * Must check guilty signal here since after this point all old
+ * HW fences are force signaled.
+ *
+ * job->base holds a reference to parent fence
+ */
+ if (job && job->base.s_fence->parent &&
+ dma_fence_is_signaled(job->base.s_fence->parent))
+ job_signaled = true;
+
+ if (!amdgpu_device_ip_need_full_reset(adev))
+ device_list_handle = &device_list;
+
+ if (job_signaled) {
+ dev_info(adev->dev, "Guilty job already signaled, skipping HW reset");
+ goto skip_hw_reset;
+ }
+
+
+ /* Guilty job will be freed after this*/
+ r = amdgpu_device_pre_asic_reset(adev,
+ job,
+ &need_full_reset);
+ if (r) {
+ /*TODO Should we stop ?*/
+ DRM_ERROR("GPU pre asic reset failed with err, %d for drm dev, %s ",
+ r, adev->ddev->unique);
+ adev->asic_reset_res = r;
+ }
+
retry: /* Rest of adevs pre asic reset from XGMI hive. */
list_for_each_entry(tmp_adev, device_list_handle, gmc.xgmi.head) {
if (tmp_adev == adev)
continue;
- amdgpu_device_lock_adev(tmp_adev);
+ amdgpu_device_lock_adev(tmp_adev, false);
r = amdgpu_device_pre_asic_reset(tmp_adev,
NULL,
&need_full_reset);
@@ -3635,9 +3655,42 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
goto retry;
}
+skip_hw_reset:
+ /*
+ * Guilty job did complete and hence needs to be manually removed
+ * See drm_sched_stop doc.
+ */
+ if (job && list_empty(&job->base.node))
+ job->base.sched->ops->free_job(&job->base);
+
/* Post ASIC reset for all devs .*/
list_for_each_entry(tmp_adev, device_list_handle, gmc.xgmi.head) {
- amdgpu_device_post_asic_reset(tmp_adev);
+ for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
+ struct drm_sched_job *s_job;
+ struct amdgpu_ring *ring = tmp_adev->rings[i];
+
+ if (!ring || !ring->sched.thread)
+ continue;
+
+ /* No point to resubmit jobs if we didn't HW reset*/
+ if (!tmp_adev->asic_reset_res && !job_signaled)
+ drm_sched_resubmit_jobs(&ring->sched);
+
+ /* hw_rq_count was decremented in drm_sched_sop */
+ if (job_signaled) {
+ list_for_each_entry(s_job, &ring->sched.ring_mirror_list, node) {
+ atomic_inc(&ring->sched.hw_rq_count);
+ }
+ }
+
+ drm_sched_start(&ring->sched, !tmp_adev->asic_reset_res);
+ }
+
+ if (!amdgpu_device_has_dc_support(tmp_adev) && !job_signaled) {
+ drm_helper_resume_force_mode(tmp_adev->ddev);
+ }
+
+ tmp_adev->asic_reset_res = 0;
if (r) {
/* bad news, how to tell it to userspace ? */
@@ -3650,7 +3703,7 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
amdgpu_device_unlock_adev(tmp_adev);
}
- if (hive && adev->gmc.xgmi.num_physical_nodes > 1)
+ if (hive)
mutex_unlock(&hive->reset_lock);
if (r)
--
2.7.4
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