This patch does not change current behaviour.

The driver's job timeout handler now returns status indicating back to the DRM layer whether the device (GPU) is no longer available, such as after it's been unplugged, or whether all is normal, i.e. current behaviour.

All drivers which make use of the drm_sched_backend_ops' .timedout_job() callback have been accordingly renamed and return the would've-been default value of DRM_GPU_SCHED_STAT_NOMINAL to restart the task's timeout timer--this is the old behaviour, and is preserved by this patch.

v2: Use enum as the status of a driver's job timeout callback method.

v3: Return scheduler/device information, rather than task information.

Cc: Alexander Deucher Alexander.Deucher@amd.com Cc: Andrey Grodzovsky Andrey.Grodzovsky@amd.com Cc: Christian König christian.koenig@amd.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Lucas Stach l.stach@pengutronix.de Cc: Russell King linux+etnaviv@armlinux.org.uk Cc: Christian Gmeiner christian.gmeiner@gmail.com Cc: Qiang Yu yuq825@gmail.com Cc: Rob Herring robh@kernel.org Cc: Tomeu Vizoso tomeu.vizoso@collabora.com Cc: Steven Price steven.price@arm.com Cc: Alyssa Rosenzweig alyssa.rosenzweig@collabora.com Cc: Eric Anholt eric@anholt.net Reported-by: kernel test robot lkp@intel.com Signed-off-by: Luben Tuikov luben.tuikov@amd.com --- drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 6 +++-- drivers/gpu/drm/etnaviv/etnaviv_sched.c | 7 +++++- drivers/gpu/drm/lima/lima_sched.c | 4 +++- drivers/gpu/drm/panfrost/panfrost_job.c | 9 ++++--- drivers/gpu/drm/scheduler/sched_main.c | 4 +--- drivers/gpu/drm/v3d/v3d_sched.c | 32 +++++++++++++------------ include/drm/gpu_scheduler.h | 18 +++++++++++--- 7 files changed, 52 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c index ff48101bab55..759b34799221 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c @@ -28,7 +28,7 @@ #include "amdgpu.h" #include "amdgpu_trace.h"

-static void amdgpu_job_timedout(struct drm_sched_job *s_job) +static enum drm_gpu_sched_stat amdgpu_job_timedout(struct drm_sched_job *s_job) { struct amdgpu_ring *ring = to_amdgpu_ring(s_job->sched); struct amdgpu_job *job = to_amdgpu_job(s_job); @@ -41,7 +41,7 @@ static void amdgpu_job_timedout(struct drm_sched_job *s_job) amdgpu_ring_soft_recovery(ring, job->vmid, s_job->s_fence->parent)) { DRM_ERROR("ring %s timeout, but soft recovered\n", s_job->sched->name); - return; + return DRM_GPU_SCHED_STAT_NOMINAL; }

amdgpu_vm_get_task_info(ring->adev, job->pasid, &ti); @@ -53,10 +53,12 @@ static void amdgpu_job_timedout(struct drm_sched_job *s_job)

if (amdgpu_device_should_recover_gpu(ring->adev)) { amdgpu_device_gpu_recover(ring->adev, job); + return DRM_GPU_SCHED_STAT_NOMINAL; } else { drm_sched_suspend_timeout(&ring->sched); if (amdgpu_sriov_vf(adev)) adev->virt.tdr_debug = true; + return DRM_GPU_SCHED_STAT_NOMINAL; } }

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sched.c b/drivers/gpu/drm/etnaviv/etnaviv_sched.c index cd46c882269c..2a9439cbb0fb 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_sched.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_sched.c @@ -82,7 +82,8 @@ static struct dma_fence *etnaviv_sched_run_job(struct drm_sched_job *sched_job) return fence; }

-static void etnaviv_sched_timedout_job(struct drm_sched_job *sched_job) +static enum drm_gpu_sched_stat etnaviv_sched_timedout_job(struct drm_sched_job + *sched_job) { struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job); struct etnaviv_gpu *gpu = submit->gpu; @@ -120,9 +121,13 @@ static void etnaviv_sched_timedout_job(struct drm_sched_job *sched_job)

drm_sched_resubmit_jobs(&gpu->sched);

+ drm_sched_start(&gpu->sched, true); + return DRM_GPU_SCHED_STAT_NOMINAL; + out_no_timeout: /* restart scheduler after GPU is usable again */ drm_sched_start(&gpu->sched, true); + return DRM_GPU_SCHED_STAT_NOMINAL; }

static void etnaviv_sched_free_job(struct drm_sched_job *sched_job) diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c index 63b4c5643f9c..6e4273852712 100644 --- a/drivers/gpu/drm/lima/lima_sched.c +++ b/drivers/gpu/drm/lima/lima_sched.c @@ -415,7 +415,7 @@ static void lima_sched_build_error_task_list(struct lima_sched_task *task) mutex_unlock(&dev->error_task_list_lock); }

-static void lima_sched_timedout_job(struct drm_sched_job *job) +static enum drm_gpu_sched_stat lima_sched_timedout_job(struct drm_sched_job *job) { struct lima_sched_pipe *pipe = to_lima_pipe(job->sched); struct lima_sched_task *task = to_lima_task(job); @@ -449,6 +449,8 @@ static void lima_sched_timedout_job(struct drm_sched_job *job)

drm_sched_resubmit_jobs(&pipe->base); drm_sched_start(&pipe->base, true); + + return DRM_GPU_SCHED_STAT_NOMINAL; }

static void lima_sched_free_job(struct drm_sched_job *job) diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c index 04e6f6f9b742..0a83eefa49c4 100644 --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -432,7 +432,8 @@ static void panfrost_scheduler_start(struct panfrost_queue_state *queue) mutex_unlock(&queue->lock); }

-static void panfrost_job_timedout(struct drm_sched_job *sched_job) +static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job + *sched_job) { struct panfrost_job *job = to_panfrost_job(sched_job); struct panfrost_device *pfdev = job->pfdev; @@ -443,7 +444,7 @@ static void panfrost_job_timedout(struct drm_sched_job *sched_job) * spurious. Bail out. */ if (dma_fence_is_signaled(job->done_fence)) - return; + return DRM_GPU_SCHED_STAT_NOMINAL;

dev_err(pfdev->dev, "gpu sched timeout, js=%d, config=0x%x, status=0x%x, head=0x%x, tail=0x%x, sched_job=%p", js, @@ -455,11 +456,13 @@ static void panfrost_job_timedout(struct drm_sched_job *sched_job)

/* Scheduler is already stopped, nothing to do. */ if (!panfrost_scheduler_stop(&pfdev->js->queue[js], sched_job)) - return; + return DRM_GPU_SCHED_STAT_NOMINAL;

/* Schedule a reset if there's no reset in progress. */ if (!atomic_xchg(&pfdev->reset.pending, 1)) schedule_work(&pfdev->reset.work); + + return DRM_GPU_SCHED_STAT_NOMINAL; }

static const struct drm_sched_backend_ops panfrost_sched_ops = { diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c index 92637b70c9bf..73fccc54268b 100644 --- a/drivers/gpu/drm/scheduler/sched_main.c +++ b/drivers/gpu/drm/scheduler/sched_main.c @@ -527,7 +527,7 @@ void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery) EXPORT_SYMBOL(drm_sched_start);

/** - * drm_sched_resubmit_jobs - helper to relunch job from pending ring list + * drm_sched_resubmit_jobs - helper to relaunch jobs from the pending list * * @sched: scheduler instance * @@ -561,8 +561,6 @@ void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched) } else { s_job->s_fence->parent = fence; } - - } } EXPORT_SYMBOL(drm_sched_resubmit_jobs); diff --git a/drivers/gpu/drm/v3d/v3d_sched.c b/drivers/gpu/drm/v3d/v3d_sched.c index 452682e2209f..ef2338a294ca 100644 --- a/drivers/gpu/drm/v3d/v3d_sched.c +++ b/drivers/gpu/drm/v3d/v3d_sched.c @@ -259,7 +259,7 @@ v3d_cache_clean_job_run(struct drm_sched_job *sched_job) return NULL; }

-static void +static enum drm_gpu_sched_status v3d_gpu_reset_for_timeout(struct v3d_dev *v3d, struct drm_sched_job *sched_job) { enum v3d_queue q; @@ -285,6 +285,8 @@ v3d_gpu_reset_for_timeout(struct v3d_dev *v3d, struct drm_sched_job *sched_job) }

mutex_unlock(&v3d->reset_lock); + + return DRM_GPU_SCHED_STAT_NOMINAL; }

/* If the current address or return address have changed, then the GPU @@ -292,7 +294,7 @@ v3d_gpu_reset_for_timeout(struct v3d_dev *v3d, struct drm_sched_job *sched_job) * could fail if the GPU got in an infinite loop in the CL, but that * is pretty unlikely outside of an i-g-t testcase. */ -static void +static enum drm_task_status v3d_cl_job_timedout(struct drm_sched_job *sched_job, enum v3d_queue q, u32 *timedout_ctca, u32 *timedout_ctra) { @@ -304,39 +306,39 @@ v3d_cl_job_timedout(struct drm_sched_job *sched_job, enum v3d_queue q, if (*timedout_ctca != ctca || *timedout_ctra != ctra) { *timedout_ctca = ctca; *timedout_ctra = ctra; - return; + return DRM_GPU_SCHED_STAT_NOMINAL; }

- v3d_gpu_reset_for_timeout(v3d, sched_job); + return v3d_gpu_reset_for_timeout(v3d, sched_job); }

-static void +static enum drm_task_status v3d_bin_job_timedout(struct drm_sched_job *sched_job) { struct v3d_bin_job *job = to_bin_job(sched_job);

- v3d_cl_job_timedout(sched_job, V3D_BIN, - &job->timedout_ctca, &job->timedout_ctra); + return v3d_cl_job_timedout(sched_job, V3D_BIN, + &job->timedout_ctca, &job->timedout_ctra); }

-static void +static enum drm_task_status v3d_render_job_timedout(struct drm_sched_job *sched_job) { struct v3d_render_job *job = to_render_job(sched_job);

- v3d_cl_job_timedout(sched_job, V3D_RENDER, - &job->timedout_ctca, &job->timedout_ctra); + return v3d_cl_job_timedout(sched_job, V3D_RENDER, + &job->timedout_ctca, &job->timedout_ctra); }

-static void +static enum drm_task_status v3d_generic_job_timedout(struct drm_sched_job *sched_job) { struct v3d_job *job = to_v3d_job(sched_job);

- v3d_gpu_reset_for_timeout(job->v3d, sched_job); + return v3d_gpu_reset_for_timeout(job->v3d, sched_job); }

-static void +static enum drm_task_status v3d_csd_job_timedout(struct drm_sched_job *sched_job) { struct v3d_csd_job *job = to_csd_job(sched_job); @@ -348,10 +350,10 @@ v3d_csd_job_timedout(struct drm_sched_job *sched_job) */ if (job->timedout_batches != batches) { job->timedout_batches = batches; - return; + return DRM_GPU_SCHED_STAT_NOMINAL; }

- v3d_gpu_reset_for_timeout(v3d, sched_job); + return v3d_gpu_reset_for_timeout(v3d, sched_job); }

static const struct drm_sched_backend_ops v3d_bin_sched_ops = { diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h index 975e8a67947f..ce6a383ed99f 100644 --- a/include/drm/gpu_scheduler.h +++ b/include/drm/gpu_scheduler.h @@ -206,6 +206,12 @@ static inline bool drm_sched_invalidate_job(struct drm_sched_job *s_job, return s_job && atomic_inc_return(&s_job->karma) > threshold; }

+enum drm_gpu_sched_stat { + DRM_GPU_SCHED_STAT_NONE, /* Reserve 0 */ + DRM_GPU_SCHED_STAT_NOMINAL, + DRM_GPU_SCHED_STAT_ENODEV, +}; + /** * struct drm_sched_backend_ops * @@ -230,10 +236,16 @@ struct drm_sched_backend_ops { struct dma_fence *(*run_job)(struct drm_sched_job *sched_job);

/** - * @timedout_job: Called when a job has taken too long to execute, - * to trigger GPU recovery. + * @timedout_job: Called when a job has taken too long to execute, + * to trigger GPU recovery. + * + * Return DRM_GPU_SCHED_STAT_NOMINAL, when all is normal, + * and the underlying driver has started or completed recovery. + * + * Return DRM_GPU_SCHED_STAT_ENODEV, if the device is no longer + * available, i.e. has been unplugged. */ - void (*timedout_job)(struct drm_sched_job *sched_job); + enum drm_gpu_sched_stat (*timedout_job)(struct drm_sched_job *sched_job);

/** * @free_job: Called once the job's finished fence has been signaled