[PATCH v5 6/6] drm/amdgpu: Avoid HW reset if guilty job already signaled.
Koenig, Christian
Christian.Koenig at amd.com
Tue Apr 23 12:32:20 UTC 2019
Well you at least have to give me time till after the holidays to get
going again :)
Not sure exactly jet why we need patch number 5.
And we should probably commit patch #1 and #2.
Christian.
Am 22.04.19 um 13:54 schrieb Grodzovsky, Andrey:
> Ping for patches 3, new patch 5 and patch 6.
>
> Andrey
>
> On 4/18/19 11:00 AM, Andrey Grodzovsky wrote:
>> 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.
>> v4: rebase
>> v5: Revert v3 as we do it now in sceduler code.
>>
>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
>> ---
>> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 143 +++++++++++++++++++----------
>> 1 file changed, 95 insertions(+), 48 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> index a0e165c..85f8792 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> @@ -3334,8 +3334,6 @@ 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);
>> }
>> @@ -3343,6 +3341,7 @@ static int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
>> if(job)
>> drm_sched_increase_karma(&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)
>> @@ -3480,37 +3479,21 @@ 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;
>> -
>> - 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);
>> + if (trylock) {
>> + if (!mutex_trylock(&adev->lock_reset))
>> + return false;
>> + } else
>> + mutex_lock(&adev->lock_reset);
>>
>> - 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)
>> @@ -3538,40 +3521,42 @@ 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;
>> @@ -3588,13 +3573,56 @@ 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);
>> @@ -3618,9 +3646,28 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
>> goto retry;
>> }
>>
>> +skip_hw_reset:
>> +
>> /* 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 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);
>> +
>> + 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 ? */
>> @@ -3633,7 +3680,7 @@ 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)
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