[PATCH 4/5] drm/scheduler: Job timeout handler returns status (v2)
Andrey Grodzovsky
Andrey.Grodzovsky at amd.com
Mon Dec 7 16:00:38 UTC 2020
On 12/7/20 6:13 AM, Christian König wrote:
> Am 04.12.20 um 16:10 schrieb Andrey Grodzovsky:
>>
>> On 12/4/20 3:13 AM, Christian König wrote:
>>> Thinking more about that I came to the conclusion that the whole approach
>>> here isn't correct.
>>>
>>> See even when the job has been completed or canceled we still want to
>>> restart the timer.
>>>
>>> The reason for this is that the timer is then not restarted for the current
>>> job, but for the next job in the queue.
>>>
>>> The only valid reason to not restart the timer is that the whole device was
>>> hot plugged and we return -ENODEV here. E.g. what Andrey has been working on.
>>
>>
>> We discussed this with Luben off line a few days ago but came to a conclusion
>> that for the next job the timer restart in drm_sched_job_begin should do the
>> work, no ?
>
> Nope, drm_sched_job_begin() pushes the job to the hardware and starts the
> timeout in case the hardware was idle before.
drm_sched_job_begin only adds the job to ring mirror list and rearms the timer,
I don't see how it is related to whether the HW was idle before ?
Andrey
>
> The function should probably be renamed to drm_sched_job_pushed() because it
> doesn't begin the execution in any way.
>
> Christian.
>
>>
>> Andrey
>>
>>
>>>
>>> Regards,
>>> Christian.
>>>
>>> Am 04.12.20 um 04:17 schrieb Luben Tuikov:
>>>> The driver's job timeout handler now returns
>>>> status indicating back to the DRM layer whether
>>>> the task (job) was successfully aborted or whether
>>>> more time should be given to the task to complete.
>>>>
>>>> Default behaviour as of this patch, is preserved,
>>>> except in obvious-by-comment case in the Panfrost
>>>> driver, as documented below.
>>>>
>>>> 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_TASK_STATUS_ALIVE to restart the task's
>>>> timeout timer--this is the old behaviour, and
>>>> is preserved by this patch.
>>>>
>>>> In the case of the Panfrost driver, its timedout
>>>> callback correctly first checks if the job had
>>>> completed in due time and if so, it now returns
>>>> DRM_TASK_STATUS_COMPLETE to notify the DRM layer
>>>> that the task can be moved to the done list, to be
>>>> freed later. In the other two subsequent checks,
>>>> the value of DRM_TASK_STATUS_ALIVE is returned, as
>>>> per the default behaviour.
>>>>
>>>> A more involved driver's solutions can be had
>>>> in subequent patches.
>>>>
>>>> Signed-off-by: Luben Tuikov <luben.tuikov at amd.com>
>>>> Reported-by: kernel test robot <lkp at intel.com>
>>>>
>>>> Cc: Alexander Deucher <Alexander.Deucher at amd.com>
>>>> Cc: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>
>>>> Cc: Christian König <christian.koenig at amd.com>
>>>> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
>>>> Cc: Lucas Stach <l.stach at pengutronix.de>
>>>> Cc: Russell King <linux+etnaviv at armlinux.org.uk>
>>>> Cc: Christian Gmeiner <christian.gmeiner at gmail.com>
>>>> Cc: Qiang Yu <yuq825 at gmail.com>
>>>> Cc: Rob Herring <robh at kernel.org>
>>>> Cc: Tomeu Vizoso <tomeu.vizoso at collabora.com>
>>>> Cc: Steven Price <steven.price at arm.com>
>>>> Cc: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>
>>>> Cc: Eric Anholt <eric at anholt.net>
>>>>
>>>> v2: Use enum as the status of a driver's job
>>>> timeout callback method.
>>>> ---
>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 6 +++--
>>>> drivers/gpu/drm/etnaviv/etnaviv_sched.c | 10 +++++++-
>>>> 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 | 20 +++++++++++++---
>>>> 7 files changed, 57 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..a111326cbdde 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_task_status 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_TASK_STATUS_ALIVE;
>>>> }
>>>> 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_TASK_STATUS_ALIVE;
>>>> } else {
>>>> drm_sched_suspend_timeout(&ring->sched);
>>>> if (amdgpu_sriov_vf(adev))
>>>> adev->virt.tdr_debug = true;
>>>> + return DRM_TASK_STATUS_ALIVE;
>>>> }
>>>> }
>>>> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>>>> b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>>>> index cd46c882269c..c49516942328 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_task_status 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 +121,16 @@ static void etnaviv_sched_timedout_job(struct
>>>> drm_sched_job *sched_job)
>>>> drm_sched_resubmit_jobs(&gpu->sched);
>>>> + /* Tell the DRM scheduler that this task needs
>>>> + * more time.
>>>> + */
>>>> + drm_sched_start(&gpu->sched, true);
>>>> + return DRM_TASK_STATUS_ALIVE;
>>>> +
>>>> out_no_timeout:
>>>> /* restart scheduler after GPU is usable again */
>>>> drm_sched_start(&gpu->sched, true);
>>>> + return DRM_TASK_STATUS_ALIVE;
>>>> }
>>>> 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..66d9236b8760 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_task_status 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_TASK_STATUS_ALIVE;
>>>> }
>>>> 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..845148a722e4 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_task_status 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_TASK_STATUS_COMPLETE;
>>>> 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_TASK_STATUS_ALIVE;
>>>> /* Schedule a reset if there's no reset in progress. */
>>>> if (!atomic_xchg(&pfdev->reset.pending, 1))
>>>> schedule_work(&pfdev->reset.work);
>>>> +
>>>> + return DRM_TASK_STATUS_ALIVE;
>>>> }
>>>> 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 3eb7618a627d..b9876cad94f2 100644
>>>> --- a/drivers/gpu/drm/scheduler/sched_main.c
>>>> +++ b/drivers/gpu/drm/scheduler/sched_main.c
>>>> @@ -526,7 +526,7 @@ 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
>>>> *
>>>> @@ -560,8 +560,6 @@ 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..3740665ec479 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_task_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_TASK_STATUS_ALIVE;
>>>> }
>>>> /* 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_TASK_STATUS_ALIVE;
>>>> }
>>>> - 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_TASK_STATUS_ALIVE;
>>>> }
>>>> - 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 2e0c368e19f6..cedfc5394e52 100644
>>>> --- a/include/drm/gpu_scheduler.h
>>>> +++ b/include/drm/gpu_scheduler.h
>>>> @@ -206,6 +206,11 @@ 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_task_status {
>>>> + DRM_TASK_STATUS_COMPLETE,
>>>> + DRM_TASK_STATUS_ALIVE
>>>> +};
>>>> +
>>>> /**
>>>> * struct drm_sched_backend_ops
>>>> *
>>>> @@ -230,10 +235,19 @@ 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_TASK_STATUS_ALIVE, if the task (job) is healthy
>>>> + * and executing in the hardware, i.e. it needs more time.
>>>> + *
>>>> + * Return DRM_TASK_STATUS_COMPLETE, if the task (job) has
>>>> + * been aborted or is unknown to the hardware, i.e. if
>>>> + * the task is out of the hardware, and maybe it is now
>>>> + * in the done list, or it was completed long ago, or
>>>> + * if it is unknown to the hardware.
>>>> */
>>>> - void (*timedout_job)(struct drm_sched_job *sched_job);
>>>> + enum drm_task_status (*timedout_job)(struct drm_sched_job *sched_job);
>>>> /**
>>>> * @free_job: Called once the job's finished fence has been signaled
>>>
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