[PATCH 4/5] drm/scheduler: Job timeout handler returns status (v2)
Christian König
christian.koenig at amd.com
Mon Dec 7 19:19:52 UTC 2020
Am 07.12.20 um 20:09 schrieb Andrey Grodzovsky:
>
> On 12/7/20 1:04 PM, Christian König wrote:
>> Am 07.12.20 um 17:00 schrieb Andrey Grodzovsky:
>>>
>>> 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 ?
>>
>> It doesn't rearm the timer. It initially starts the timer when the
>> hardware is idle.
>
>
> It schedules delayed work for the timer task if ring mirror list not
> empty. Am i missing something ?
Ok, let me explain from the beginning.
drm_sched_start_timeout() initially starts the timer, it does NOT rearms
it! When the timer is already running it doesn't has any effect at all.
When a job completes drm_sched_get_cleanup_job() cancels the timer,
frees the job and then starts a new timer for the engine.
When a timeout happens the job is either canceled or give some extra
time by putting it back on the pending list.
When the job is canceled the timer must be restarted for the next job,
because drm_sched_job_begin() was already called long ago.
When the job gets some extra time we should also restart the timer.
The only case when the timer should not be restarted is when the device
was hotplugged and is completely gone now.
I think the right approach to stop this messing with the ring mirror
list is to avoid using the job altogether for recovery.
What we should do instead is to put the recovery information on the
scheduler fence, because that is the object which stays alive after
pushing the job to the hardware.
Christian.
>
> Andrey
>
>
>>
>> Christian.
>>
>>>
>>> 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
>>>>>>
>>>>> _______________________________________________
>>>>> amd-gfx mailing list
>>>>> amd-gfx at lists.freedesktop.org
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>>
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