The series is,
Acked-by: Luben Tuikov <luben.tuikov@xxxxxxx>
We don't want the kernel to be in the business of retrying client's
requests. Instead we want the kernel to provide a conduit for such
requests to be sent, executed by the GPU, and a result returned.
If the kernel cannot process requests for any reason, e.g. GPU
is being reset, or in recovery, or OOM, or there's a problem with
the request, etc., the driver should return the request back to
the client (user space), and let the client decide how to proceed.
Regards,
Luben
On 2022-10-26 11:35, Christian König wrote:
> This reverts commit e6c6338f393b74ac0b303d567bb918b44ae7ad75.
>
> This feature basically re-submits one job after another to
> figure out which one was the one causing a hang.
>
> This is obviously incompatible with gang-submit which requires
> that multiple jobs run at the same time. It's also absolutely
> not helpful to crash the hardware multiple times if a clean
> recovery is desired.
>
> For testing and debugging environments we should rather disable
> recovery alltogether to be able to inspect the state with a hw
> debugger.
>
> Additional to that the sw implementation is clearly buggy and causes
> reference count issues for the hardware fence.
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 103 ---------------------
> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +-
> drivers/gpu/drm/scheduler/sched_main.c | 58 ++----------
> include/drm/gpu_scheduler.h | 3 -
> 4 files changed, 10 insertions(+), 156 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 6f958603c8cc..d4584e577b51 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -5070,94 +5070,6 @@ static int amdgpu_device_suspend_display_audio(struct amdgpu_device *adev)
> return 0;
> }
>
> -static void amdgpu_device_recheck_guilty_jobs(
> - struct amdgpu_device *adev, struct list_head *device_list_handle,
> - struct amdgpu_reset_context *reset_context)
> -{
> - int i, r = 0;
> -
> - for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> - struct amdgpu_ring *ring = adev->rings[i];
> - int ret = 0;
> - struct drm_sched_job *s_job;
> -
> - if (!ring || !ring->sched.thread)
> - continue;
> -
> - s_job = list_first_entry_or_null(&ring->sched.pending_list,
> - struct drm_sched_job, list);
> - if (s_job == NULL)
> - continue;
> -
> - /* clear job's guilty and depend the folowing step to decide the real one */
> - drm_sched_reset_karma(s_job);
> - 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);
> -
> -
> - amdgpu_fence_driver_isr_toggle(adev, true);
> -
> - /* Clear this failed job from fence array */
> - amdgpu_fence_driver_clear_job_fences(ring);
> -
> - amdgpu_fence_driver_isr_toggle(adev, false);
> -
> - /* 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);
> - amdgpu_reset_prepare_hwcontext(adev, reset_context);
> -retry:
> - /* do hw reset */
> - if (amdgpu_sriov_vf(adev)) {
> - amdgpu_virt_fini_data_exchange(adev);
> - r = amdgpu_device_reset_sriov(adev, false);
> - if (r)
> - adev->asic_reset_res = r;
> - } else {
> - clear_bit(AMDGPU_SKIP_HW_RESET,
> - &reset_context->flags);
> - r = amdgpu_do_asic_reset(device_list_handle,
> - reset_context);
> - if (r && r == -EAGAIN)
> - goto retry;
> - }
> -
> - /*
> - * add reset counter so that the following
> - * resubmitted job could flush vmid
> - */
> - atomic_inc(&adev->gpu_reset_counter);
> - continue;
> - }
> -
> - /* got the hw fence, signal finished fence */
> - atomic_dec(ring->sched.score);
> - dma_fence_get(&s_job->s_fence->finished);
> - dma_fence_signal(&s_job->s_fence->finished);
> - dma_fence_put(&s_job->s_fence->finished);
> -
> - /* remove node from list and free the job */
> - spin_lock(&ring->sched.job_list_lock);
> - list_del_init(&s_job->list);
> - spin_unlock(&ring->sched.job_list_lock);
> - ring->sched.ops->free_job(s_job);
> - }
> -}
> -
> static inline void amdgpu_device_stop_pending_resets(struct amdgpu_device *adev)
> {
> struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
> @@ -5178,7 +5090,6 @@ static inline void amdgpu_device_stop_pending_resets(struct amdgpu_device *adev)
>
> }
>
> -
> /**
> * amdgpu_device_gpu_recover - reset the asic and recover scheduler
> *
> @@ -5201,7 +5112,6 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
> int i, r = 0;
> bool need_emergency_restart = false;
> bool audio_suspended = false;
> - int tmp_vram_lost_counter;
> bool gpu_reset_for_dev_remove = false;
>
> gpu_reset_for_dev_remove =
> @@ -5347,7 +5257,6 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
> amdgpu_device_stop_pending_resets(tmp_adev);
> }
>
> - tmp_vram_lost_counter = atomic_read(&((adev)->vram_lost_counter));
> /* Actual ASIC resets if needed.*/
> /* Host driver will handle XGMI hive reset for SRIOV */
> if (amdgpu_sriov_vf(adev)) {
> @@ -5372,18 +5281,6 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
> /* Post ASIC reset for all devs .*/
> list_for_each_entry(tmp_adev, device_list_handle, reset_list) {
>
> - /*
> - * Sometimes a later bad compute job can block a good gfx job as gfx
> - * and compute ring share internal GC HW mutually. We add an additional
> - * guilty jobs recheck step to find the real guilty job, it synchronously
> - * submits and pends for the first job being signaled. If it gets timeout,
> - * we identify it as a real guilty job.
> - */
> - if (amdgpu_gpu_recovery == 2 &&
> - !(tmp_vram_lost_counter < atomic_read(&adev->vram_lost_counter)))
> - amdgpu_device_recheck_guilty_jobs(
> - tmp_adev, device_list_handle, reset_context);
> -
> for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> struct amdgpu_ring *ring = tmp_adev->rings[i];
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 16f6a313335e..f177d8e5b665 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -519,7 +519,7 @@ module_param_named(compute_multipipe, amdgpu_compute_multipipe, int, 0444);
> * DOC: gpu_recovery (int)
> * Set to enable GPU recovery mechanism (1 = enable, 0 = disable). The default is -1 (auto, disabled except SRIOV).
> */
> -MODULE_PARM_DESC(gpu_recovery, "Enable GPU recovery mechanism, (2 = advanced tdr mode, 1 = enable, 0 = disable, -1 = auto)");
> +MODULE_PARM_DESC(gpu_recovery, "Enable GPU recovery mechanism, (1 = enable, 0 = disable, -1 = auto)");
> module_param_named(gpu_recovery, amdgpu_gpu_recovery, int, 0444);
>
> /**
> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
> index e0ab14e0fb6b..bb28f31bff6f 100644
> --- a/drivers/gpu/drm/scheduler/sched_main.c
> +++ b/drivers/gpu/drm/scheduler/sched_main.c
> @@ -355,27 +355,6 @@ static void drm_sched_job_timedout(struct work_struct *work)
> }
> }
>
> - /**
> - * drm_sched_increase_karma - Update sched_entity guilty flag
> - *
> - * @bad: The job guilty of time out
> - *
> - * Increment on every hang caused by the 'bad' job. If this exceeds the hang
> - * limit of the scheduler then the respective sched entity is marked guilty and
> - * jobs from it will not be scheduled further
> - */
> -void drm_sched_increase_karma(struct drm_sched_job *bad)
> -{
> - drm_sched_increase_karma_ext(bad, 1);
> -}
> -EXPORT_SYMBOL(drm_sched_increase_karma);
> -
> -void drm_sched_reset_karma(struct drm_sched_job *bad)
> -{
> - drm_sched_increase_karma_ext(bad, 0);
> -}
> -EXPORT_SYMBOL(drm_sched_reset_karma);
> -
> /**
> * drm_sched_stop - stop the scheduler
> *
> @@ -516,32 +495,15 @@ EXPORT_SYMBOL(drm_sched_start);
> *
> */
> void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched)
> -{
> - drm_sched_resubmit_jobs_ext(sched, INT_MAX);
> -}
> -EXPORT_SYMBOL(drm_sched_resubmit_jobs);
> -
> -/**
> - * drm_sched_resubmit_jobs_ext - helper to relunch certain number of jobs from mirror ring list
> - *
> - * @sched: scheduler instance
> - * @max: job numbers to relaunch
> - *
> - */
> -void drm_sched_resubmit_jobs_ext(struct drm_gpu_scheduler *sched, int max)
> {
> struct drm_sched_job *s_job, *tmp;
> uint64_t guilty_context;
> bool found_guilty = false;
> struct dma_fence *fence;
> - int i = 0;
>
> list_for_each_entry_safe(s_job, tmp, &sched->pending_list, list) {
> struct drm_sched_fence *s_fence = s_job->s_fence;
>
> - if (i >= max)
> - break;
> -
> if (!found_guilty && atomic_read(&s_job->karma) > sched->hang_limit) {
> found_guilty = true;
> guilty_context = s_job->s_fence->scheduled.context;
> @@ -551,7 +513,6 @@ void drm_sched_resubmit_jobs_ext(struct drm_gpu_scheduler *sched, int max)
> dma_fence_set_error(&s_fence->finished, -ECANCELED);
>
> fence = sched->ops->run_job(s_job);
> - i++;
>
> if (IS_ERR_OR_NULL(fence)) {
> if (IS_ERR(fence))
> @@ -567,7 +528,7 @@ void drm_sched_resubmit_jobs_ext(struct drm_gpu_scheduler *sched, int max)
> }
> }
> }
> -EXPORT_SYMBOL(drm_sched_resubmit_jobs_ext);
> +EXPORT_SYMBOL(drm_sched_resubmit_jobs);
>
> /**
> * drm_sched_job_init - init a scheduler job
> @@ -1081,13 +1042,15 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
> EXPORT_SYMBOL(drm_sched_fini);
>
> /**
> - * drm_sched_increase_karma_ext - Update sched_entity guilty flag
> + * drm_sched_increase_karma - Update sched_entity guilty flag
> *
> * @bad: The job guilty of time out
> - * @type: type for increase/reset karma
> *
> + * Increment on every hang caused by the 'bad' job. If this exceeds the hang
> + * limit of the scheduler then the respective sched entity is marked guilty and
> + * jobs from it will not be scheduled further
> */
> -void drm_sched_increase_karma_ext(struct drm_sched_job *bad, int type)
> +void drm_sched_increase_karma(struct drm_sched_job *bad)
> {
> int i;
> struct drm_sched_entity *tmp;
> @@ -1099,10 +1062,7 @@ void drm_sched_increase_karma_ext(struct drm_sched_job *bad, int type)
> * corrupt but keep in mind that kernel jobs always considered good.
> */
> if (bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
> - if (type == 0)
> - atomic_set(&bad->karma, 0);
> - else if (type == 1)
> - atomic_inc(&bad->karma);
> + atomic_inc(&bad->karma);
>
> for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_KERNEL;
> i++) {
> @@ -1113,7 +1073,7 @@ void drm_sched_increase_karma_ext(struct drm_sched_job *bad, int type)
> if (bad->s_fence->scheduled.context ==
> entity->fence_context) {
> if (entity->guilty)
> - atomic_set(entity->guilty, type);
> + atomic_set(entity->guilty, 1);
> break;
> }
> }
> @@ -1123,4 +1083,4 @@ void drm_sched_increase_karma_ext(struct drm_sched_job *bad, int type)
> }
> }
> }
> -EXPORT_SYMBOL(drm_sched_increase_karma_ext);
> +EXPORT_SYMBOL(drm_sched_increase_karma);
> diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
> index 0fca8f38bee4..c564be29c5ae 100644
> --- a/include/drm/gpu_scheduler.h
> +++ b/include/drm/gpu_scheduler.h
> @@ -488,10 +488,7 @@ void drm_sched_wakeup(struct drm_gpu_scheduler *sched);
> void drm_sched_stop(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad);
> void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery);
> void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched);
> -void drm_sched_resubmit_jobs_ext(struct drm_gpu_scheduler *sched, int max);
> void drm_sched_increase_karma(struct drm_sched_job *bad);
> -void drm_sched_reset_karma(struct drm_sched_job *bad);
> -void drm_sched_increase_karma_ext(struct drm_sched_job *bad, int type);
> bool drm_sched_dependency_optimized(struct dma_fence* fence,
> struct drm_sched_entity *entity);
> void drm_sched_fault(struct drm_gpu_scheduler *sched);
--
Regards,
Luben
