[PATCH 3/4] drm/amdgpu: Avoid HW reset if guilty job already signaled.
Andrey Grodzovsky
andrey.grodzovsky at amd.com
Thu Apr 11 16:03:43 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.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 125 ++++++++++++++++++++---------
1 file changed, 88 insertions(+), 37 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index aabd043..ce9c494 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3327,7 +3327,8 @@ bool amdgpu_device_should_recover_gpu(struct amdgpu_device *adev)
static int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
struct amdgpu_job *job,
- bool *need_full_reset_arg)
+ bool *need_full_reset_arg,
+ bool job_signaled)
{
int i, r = 0;
bool need_full_reset = *need_full_reset_arg;
@@ -3339,8 +3340,6 @@ 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);
}
@@ -3358,7 +3357,8 @@ static int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
- if (!amdgpu_sriov_vf(adev)) {
+ /* Don't suspend on bare metal if we are not going to HW reset the ASIC */
+ if (!amdgpu_sriov_vf(adev) && !job_signaled) {
if (!need_full_reset)
need_full_reset = amdgpu_device_ip_need_full_reset(adev);
@@ -3495,7 +3495,7 @@ 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 void amdgpu_device_post_asic_reset(struct amdgpu_device *adev, bool job_signaled)
{
int i;
@@ -3505,7 +3505,8 @@ static void amdgpu_device_post_asic_reset(struct amdgpu_device *adev)
if (!ring || !ring->sched.thread)
continue;
- if (!adev->asic_reset_res)
+ /* No point to resubmit jobs if we didn't HW reset*/
+ if (!adev->asic_reset_res && !job_signaled)
drm_sched_resubmit_jobs(&ring->sched);
drm_sched_start(&ring->sched, !adev->asic_reset_res);
@@ -3518,14 +3519,21 @@ static void amdgpu_device_post_asic_reset(struct amdgpu_device *adev)
adev->asic_reset_res = 0;
}
-static void amdgpu_device_lock_adev(struct amdgpu_device *adev)
+static bool amdgpu_device_lock_adev(struct amdgpu_device *adev, bool trylock)
{
- mutex_lock(&adev->lock_reset);
+ if (trylock) {
+ if (!mutex_trylock(&adev->lock_reset))
+ return false;
+ } else
+ 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)
@@ -3553,38 +3561,43 @@ 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;
+ int r, i;
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;
+ bool xgmi_topology_present, need_full_reset, job_signaled;
+ 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, 0);
+ xgmi_topology_present = hive && adev->gmc.xgmi.num_physical_nodes > 1;
+
/*
- * 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 tdr 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 (xgmi_topology_present && !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, !xgmi_topology_present)) {
+ DRM_INFO("Bailing on TDR for s_job:%llx, as another already in progress",
+ job->base.id);
+ return 0;
}
+ need_full_reset = amdgpu_device_ip_need_full_reset(adev);
+
/* Build list of devices to reset */
if (need_full_reset && adev->gmc.xgmi.num_physical_nodes > 1) {
if (!hive) {
@@ -3603,16 +3616,52 @@ 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;
+
+
+ /* Guilty job will be freed after this*/
+ r = amdgpu_device_pre_asic_reset(adev,
+ job,
+ &need_full_reset,
+ job_signaled);
+ 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);
+ &need_full_reset,
+ job_signaled);
/*TODO Should we stop ?*/
if (r) {
DRM_ERROR("GPU pre asic reset failed with err, %d for drm dev, %s ",
@@ -3623,19 +3672,21 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
/* Actual ASIC resets if needed.*/
/* TODO Implement XGMI hive reset logic for SRIOV */
- if (amdgpu_sriov_vf(adev)) {
- r = amdgpu_device_reset_sriov(adev, job ? false : true);
- if (r)
- adev->asic_reset_res = r;
- } else {
- r = amdgpu_do_asic_reset(hive, device_list_handle, &need_full_reset);
- if (r && r == -EAGAIN)
- goto retry;
+ if (!job || !job_signaled) {
+ if (amdgpu_sriov_vf(adev)) {
+ r = amdgpu_device_reset_sriov(adev, job ? false : true);
+ if (r)
+ adev->asic_reset_res = r;
+ } else {
+ r = amdgpu_do_asic_reset(hive, device_list_handle, &need_full_reset);
+ if (r && r == -EAGAIN)
+ goto retry;
+ }
}
/* 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);
+ amdgpu_device_post_asic_reset(tmp_adev, job_signaled);
if (r) {
/* bad news, how to tell it to userspace ? */
@@ -3648,7 +3699,7 @@ 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 (xgmi_topology_present)
mutex_unlock(&hive->reset_lock);
if (r)
--
2.7.4
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