+Monk.
GPU reset is used widely in SRIOV, so need virtulizatino guy take a look.
But out of curious, why guilty job can signal more if the job is already
set to guilty? set it wrongly?
-David
在 2019/4/18 23:00, Andrey Grodzovsky 写道:
> 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.grodzov...@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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