[PATCH v2 01/11] drm/sched: Split drm_sched_job_init
Christian König
christian.koenig at amd.com
Thu Jul 8 06:56:04 UTC 2021
Am 07.07.21 um 18:32 schrieb Daniel Vetter:
> On Wed, Jul 7, 2021 at 2:58 PM Christian König <christian.koenig at amd.com> wrote:
>> Am 07.07.21 um 14:13 schrieb Daniel Vetter:
>>> On Wed, Jul 7, 2021 at 1:57 PM Christian König <christian.koenig at amd.com> wrote:
>>>> Am 07.07.21 um 13:14 schrieb Daniel Vetter:
>>>>> On Wed, Jul 7, 2021 at 11:30 AM Christian König
>>>>> <christian.koenig at amd.com> wrote:
>>>>>> Am 02.07.21 um 23:38 schrieb Daniel Vetter:
>>>>>>> This is a very confusingly named function, because not just does it
>>>>>>> init an object, it arms it and provides a point of no return for
>>>>>>> pushing a job into the scheduler. It would be nice if that's a bit
>>>>>>> clearer in the interface.
>>>>>>>
>>>>>>> But the real reason is that I want to push the dependency tracking
>>>>>>> helpers into the scheduler code, and that means drm_sched_job_init
>>>>>>> must be called a lot earlier, without arming the job.
>>>>>>>
>>>>>>> v2:
>>>>>>> - don't change .gitignore (Steven)
>>>>>>> - don't forget v3d (Emma)
>>>>>>>
>>>>>>> v3: Emma noticed that I leak the memory allocated in
>>>>>>> drm_sched_job_init if we bail out before the point of no return in
>>>>>>> subsequent driver patches. To be able to fix this change
>>>>>>> drm_sched_job_cleanup() so it can handle being called both before and
>>>>>>> after drm_sched_job_arm().
>>>>>> Thinking more about this, I'm not sure if this really works.
>>>>>>
>>>>>> See drm_sched_job_init() was also calling drm_sched_entity_select_rq()
>>>>>> to update the entity->rq association.
>>>>>>
>>>>>> And that can only be done later on when we arm the fence as well.
>>>>> Hm yeah, but that's a bug in the existing code I think: We already
>>>>> fail to clean up if we fail to allocate the fences. So I think the
>>>>> right thing to do here is to split the checks into job_init, and do
>>>>> the actual arming/rq selection in job_arm? I'm not entirely sure
>>>>> what's all going on there, the first check looks a bit like trying to
>>>>> schedule before the entity is set up, which is a driver bug and should
>>>>> have a WARN_ON?
>>>> No you misunderstood me, the problem is something else.
>>>>
>>>> You asked previously why the call to drm_sched_job_init() was so late in
>>>> the CS.
>>>>
>>>> The reason for this was not alone the scheduler fence init, but also the
>>>> call to drm_sched_entity_select_rq().
>>> Ah ok, I think I can fix that. Needs a prep patch to first make
>>> drm_sched_entity_select infallible, then should be easy to do.
>>>
>>>>> The 2nd check around last_scheduled I have honeslty no idea what it's
>>>>> even trying to do.
>>>> You mean that here?
>>>>
>>>> fence = READ_ONCE(entity->last_scheduled);
>>>> if (fence && !dma_fence_is_signaled(fence))
>>>> return;
>>>>
>>>> This makes sure that load balancing is not moving the entity to a
>>>> different scheduler while there are still jobs running from this entity
>>>> on the hardware,
>>> Yeah after a nap that idea crossed my mind too. But now I have locking
>>> questions, afaiui the scheduler thread updates this, without taking
>>> any locks - entity dequeuing is lockless. And here we read the fence
>>> and then seem to yolo check whether it's signalled? What's preventing
>>> a use-after-free here? There's no rcu or anything going on here at
>>> all, and it's outside of the spinlock section, which starts a bit
>>> further down.
>> The last_scheduled fence of an entity can only change when there are
>> jobs on the entities queued, and we have just ruled that out in the
>> check before.
> There aren't any barriers, so the cpu could easily run the two checks
> the other way round. I'll ponder this and figure out where exactly we
> need docs for the constraint and/or barriers to make this work as
> intended. As-is I'm not seeing how it does ...
spsc_queue_count() provides the necessary barrier with the atomic_read().
But yes a comment would be really nice here. I had to think for a while
why we don't need this as well.
Christian.
> -Daniel
>
>> Christian.
>>
>>
>>> -Daniel
>>>
>>>> Regards
>>>> Christian.
>>>>
>>>>> -Daniel
>>>>>
>>>>>> Christian.
>>>>>>
>>>>>>> Also improve the kerneldoc for this.
>>>>>>>
>>>>>>> Acked-by: Steven Price <steven.price at arm.com> (v2)
>>>>>>> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
>>>>>>> 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: David Airlie <airlied at linux.ie>
>>>>>>> Cc: Daniel Vetter <daniel at ffwll.ch>
>>>>>>> Cc: Sumit Semwal <sumit.semwal at linaro.org>
>>>>>>> Cc: "Christian König" <christian.koenig at amd.com>
>>>>>>> Cc: Masahiro Yamada <masahiroy at kernel.org>
>>>>>>> Cc: Kees Cook <keescook at chromium.org>
>>>>>>> Cc: Adam Borowski <kilobyte at angband.pl>
>>>>>>> Cc: Nick Terrell <terrelln at fb.com>
>>>>>>> Cc: Mauro Carvalho Chehab <mchehab+huawei at kernel.org>
>>>>>>> Cc: Paul Menzel <pmenzel at molgen.mpg.de>
>>>>>>> Cc: Sami Tolvanen <samitolvanen at google.com>
>>>>>>> Cc: Viresh Kumar <viresh.kumar at linaro.org>
>>>>>>> Cc: Alex Deucher <alexander.deucher at amd.com>
>>>>>>> Cc: Dave Airlie <airlied at redhat.com>
>>>>>>> Cc: Nirmoy Das <nirmoy.das at amd.com>
>>>>>>> Cc: Deepak R Varma <mh12gx2825 at gmail.com>
>>>>>>> Cc: Lee Jones <lee.jones at linaro.org>
>>>>>>> Cc: Kevin Wang <kevin1.wang at amd.com>
>>>>>>> Cc: Chen Li <chenli at uniontech.com>
>>>>>>> Cc: Luben Tuikov <luben.tuikov at amd.com>
>>>>>>> Cc: "Marek Olšák" <marek.olsak at amd.com>
>>>>>>> Cc: Dennis Li <Dennis.Li at amd.com>
>>>>>>> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>>>>>>> Cc: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
>>>>>>> Cc: Sonny Jiang <sonny.jiang at amd.com>
>>>>>>> Cc: Boris Brezillon <boris.brezillon at collabora.com>
>>>>>>> Cc: Tian Tao <tiantao6 at hisilicon.com>
>>>>>>> Cc: Jack Zhang <Jack.Zhang1 at amd.com>
>>>>>>> Cc: etnaviv at lists.freedesktop.org
>>>>>>> Cc: lima at lists.freedesktop.org
>>>>>>> Cc: linux-media at vger.kernel.org
>>>>>>> Cc: linaro-mm-sig at lists.linaro.org
>>>>>>> Cc: Emma Anholt <emma at anholt.net>
>>>>>>> ---
>>>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 ++
>>>>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 2 ++
>>>>>>> drivers/gpu/drm/etnaviv/etnaviv_sched.c | 2 ++
>>>>>>> drivers/gpu/drm/lima/lima_sched.c | 2 ++
>>>>>>> drivers/gpu/drm/panfrost/panfrost_job.c | 2 ++
>>>>>>> drivers/gpu/drm/scheduler/sched_entity.c | 6 ++--
>>>>>>> drivers/gpu/drm/scheduler/sched_fence.c | 17 +++++----
>>>>>>> drivers/gpu/drm/scheduler/sched_main.c | 46 +++++++++++++++++++++---
>>>>>>> drivers/gpu/drm/v3d/v3d_gem.c | 2 ++
>>>>>>> include/drm/gpu_scheduler.h | 7 +++-
>>>>>>> 10 files changed, 74 insertions(+), 14 deletions(-)
>>>>>>>
>>>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>>>>>>> index c5386d13eb4a..a4ec092af9a7 100644
>>>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>>>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>>>>>>> @@ -1226,6 +1226,8 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
>>>>>>> if (r)
>>>>>>> goto error_unlock;
>>>>>>>
>>>>>>> + drm_sched_job_arm(&job->base);
>>>>>>> +
>>>>>>> /* No memory allocation is allowed while holding the notifier lock.
>>>>>>> * The lock is held until amdgpu_cs_submit is finished and fence is
>>>>>>> * added to BOs.
>>>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>>>>>>> index d33e6d97cc89..5ddb955d2315 100644
>>>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>>>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
>>>>>>> @@ -170,6 +170,8 @@ int amdgpu_job_submit(struct amdgpu_job *job, struct drm_sched_entity *entity,
>>>>>>> if (r)
>>>>>>> return r;
>>>>>>>
>>>>>>> + drm_sched_job_arm(&job->base);
>>>>>>> +
>>>>>>> *f = dma_fence_get(&job->base.s_fence->finished);
>>>>>>> amdgpu_job_free_resources(job);
>>>>>>> drm_sched_entity_push_job(&job->base, entity);
>>>>>>> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_sched.c b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>>>>>>> index feb6da1b6ceb..05f412204118 100644
>>>>>>> --- a/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>>>>>>> +++ b/drivers/gpu/drm/etnaviv/etnaviv_sched.c
>>>>>>> @@ -163,6 +163,8 @@ int etnaviv_sched_push_job(struct drm_sched_entity *sched_entity,
>>>>>>> if (ret)
>>>>>>> goto out_unlock;
>>>>>>>
>>>>>>> + drm_sched_job_arm(&submit->sched_job);
>>>>>>> +
>>>>>>> submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
>>>>>>> submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr,
>>>>>>> submit->out_fence, 0,
>>>>>>> diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c
>>>>>>> index dba8329937a3..38f755580507 100644
>>>>>>> --- a/drivers/gpu/drm/lima/lima_sched.c
>>>>>>> +++ b/drivers/gpu/drm/lima/lima_sched.c
>>>>>>> @@ -129,6 +129,8 @@ int lima_sched_task_init(struct lima_sched_task *task,
>>>>>>> return err;
>>>>>>> }
>>>>>>>
>>>>>>> + drm_sched_job_arm(&task->base);
>>>>>>> +
>>>>>>> task->num_bos = num_bos;
>>>>>>> task->vm = lima_vm_get(vm);
>>>>>>>
>>>>>>> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
>>>>>>> index 71a72fb50e6b..2992dc85325f 100644
>>>>>>> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
>>>>>>> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
>>>>>>> @@ -288,6 +288,8 @@ int panfrost_job_push(struct panfrost_job *job)
>>>>>>> goto unlock;
>>>>>>> }
>>>>>>>
>>>>>>> + drm_sched_job_arm(&job->base);
>>>>>>> +
>>>>>>> job->render_done_fence = dma_fence_get(&job->base.s_fence->finished);
>>>>>>>
>>>>>>> ret = panfrost_acquire_object_fences(job->bos, job->bo_count,
>>>>>>> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
>>>>>>> index 79554aa4dbb1..f7347c284886 100644
>>>>>>> --- a/drivers/gpu/drm/scheduler/sched_entity.c
>>>>>>> +++ b/drivers/gpu/drm/scheduler/sched_entity.c
>>>>>>> @@ -485,9 +485,9 @@ void drm_sched_entity_select_rq(struct drm_sched_entity *entity)
>>>>>>> * @sched_job: job to submit
>>>>>>> * @entity: scheduler entity
>>>>>>> *
>>>>>>> - * Note: To guarantee that the order of insertion to queue matches
>>>>>>> - * the job's fence sequence number this function should be
>>>>>>> - * called with drm_sched_job_init under common lock.
>>>>>>> + * Note: To guarantee that the order of insertion to queue matches the job's
>>>>>>> + * fence sequence number this function should be called with drm_sched_job_arm()
>>>>>>> + * under common lock.
>>>>>>> *
>>>>>>> * Returns 0 for success, negative error code otherwise.
>>>>>>> */
>>>>>>> diff --git a/drivers/gpu/drm/scheduler/sched_fence.c b/drivers/gpu/drm/scheduler/sched_fence.c
>>>>>>> index 69de2c76731f..c451ee9a30d7 100644
>>>>>>> --- a/drivers/gpu/drm/scheduler/sched_fence.c
>>>>>>> +++ b/drivers/gpu/drm/scheduler/sched_fence.c
>>>>>>> @@ -90,7 +90,7 @@ static const char *drm_sched_fence_get_timeline_name(struct dma_fence *f)
>>>>>>> *
>>>>>>> * Free up the fence memory after the RCU grace period.
>>>>>>> */
>>>>>>> -static void drm_sched_fence_free(struct rcu_head *rcu)
>>>>>>> +void drm_sched_fence_free(struct rcu_head *rcu)
>>>>>>> {
>>>>>>> struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
>>>>>>> struct drm_sched_fence *fence = to_drm_sched_fence(f);
>>>>>>> @@ -152,11 +152,10 @@ struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f)
>>>>>>> }
>>>>>>> EXPORT_SYMBOL(to_drm_sched_fence);
>>>>>>>
>>>>>>> -struct drm_sched_fence *drm_sched_fence_create(struct drm_sched_entity *entity,
>>>>>>> - void *owner)
>>>>>>> +struct drm_sched_fence *drm_sched_fence_alloc(struct drm_sched_entity *entity,
>>>>>>> + void *owner)
>>>>>>> {
>>>>>>> struct drm_sched_fence *fence = NULL;
>>>>>>> - unsigned seq;
>>>>>>>
>>>>>>> fence = kmem_cache_zalloc(sched_fence_slab, GFP_KERNEL);
>>>>>>> if (fence == NULL)
>>>>>>> @@ -166,13 +165,19 @@ struct drm_sched_fence *drm_sched_fence_create(struct drm_sched_entity *entity,
>>>>>>> fence->sched = entity->rq->sched;
>>>>>>> spin_lock_init(&fence->lock);
>>>>>>>
>>>>>>> + return fence;
>>>>>>> +}
>>>>>>> +
>>>>>>> +void drm_sched_fence_init(struct drm_sched_fence *fence,
>>>>>>> + struct drm_sched_entity *entity)
>>>>>>> +{
>>>>>>> + unsigned seq;
>>>>>>> +
>>>>>>> seq = atomic_inc_return(&entity->fence_seq);
>>>>>>> dma_fence_init(&fence->scheduled, &drm_sched_fence_ops_scheduled,
>>>>>>> &fence->lock, entity->fence_context, seq);
>>>>>>> dma_fence_init(&fence->finished, &drm_sched_fence_ops_finished,
>>>>>>> &fence->lock, entity->fence_context + 1, seq);
>>>>>>> -
>>>>>>> - return fence;
>>>>>>> }
>>>>>>>
>>>>>>> module_init(drm_sched_fence_slab_init);
>>>>>>> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
>>>>>>> index 33c414d55fab..5e84e1500c32 100644
>>>>>>> --- a/drivers/gpu/drm/scheduler/sched_main.c
>>>>>>> +++ b/drivers/gpu/drm/scheduler/sched_main.c
>>>>>>> @@ -48,9 +48,11 @@
>>>>>>> #include <linux/wait.h>
>>>>>>> #include <linux/sched.h>
>>>>>>> #include <linux/completion.h>
>>>>>>> +#include <linux/dma-resv.h>
>>>>>>> #include <uapi/linux/sched/types.h>
>>>>>>>
>>>>>>> #include <drm/drm_print.h>
>>>>>>> +#include <drm/drm_gem.h>
>>>>>>> #include <drm/gpu_scheduler.h>
>>>>>>> #include <drm/spsc_queue.h>
>>>>>>>
>>>>>>> @@ -569,7 +571,6 @@ EXPORT_SYMBOL(drm_sched_resubmit_jobs_ext);
>>>>>>>
>>>>>>> /**
>>>>>>> * drm_sched_job_init - init a scheduler job
>>>>>>> - *
>>>>>>> * @job: scheduler job to init
>>>>>>> * @entity: scheduler entity to use
>>>>>>> * @owner: job owner for debugging
>>>>>>> @@ -577,6 +578,9 @@ EXPORT_SYMBOL(drm_sched_resubmit_jobs_ext);
>>>>>>> * Refer to drm_sched_entity_push_job() documentation
>>>>>>> * for locking considerations.
>>>>>>> *
>>>>>>> + * Drivers must make sure drm_sched_job_cleanup() if this function returns
>>>>>>> + * successfully, even when @job is aborted before drm_sched_job_arm() is called.
>>>>>>> + *
>>>>>>> * Returns 0 for success, negative error code otherwise.
>>>>>>> */
>>>>>>> int drm_sched_job_init(struct drm_sched_job *job,
>>>>>>> @@ -594,7 +598,7 @@ int drm_sched_job_init(struct drm_sched_job *job,
>>>>>>> job->sched = sched;
>>>>>>> job->entity = entity;
>>>>>>> job->s_priority = entity->rq - sched->sched_rq;
>>>>>>> - job->s_fence = drm_sched_fence_create(entity, owner);
>>>>>>> + job->s_fence = drm_sched_fence_alloc(entity, owner);
>>>>>>> if (!job->s_fence)
>>>>>>> return -ENOMEM;
>>>>>>> job->id = atomic64_inc_return(&sched->job_id_count);
>>>>>>> @@ -606,13 +610,47 @@ int drm_sched_job_init(struct drm_sched_job *job,
>>>>>>> EXPORT_SYMBOL(drm_sched_job_init);
>>>>>>>
>>>>>>> /**
>>>>>>> - * drm_sched_job_cleanup - clean up scheduler job resources
>>>>>>> + * drm_sched_job_arm - arm a scheduler job for execution
>>>>>>> + * @job: scheduler job to arm
>>>>>>> + *
>>>>>>> + * This arms a scheduler job for execution. Specifically it initializes the
>>>>>>> + * &drm_sched_job.s_fence of @job, so that it can be attached to struct dma_resv
>>>>>>> + * or other places that need to track the completion of this job.
>>>>>>> + *
>>>>>>> + * Refer to drm_sched_entity_push_job() documentation for locking
>>>>>>> + * considerations.
>>>>>>> *
>>>>>>> + * This can only be called if drm_sched_job_init() succeeded.
>>>>>>> + */
>>>>>>> +void drm_sched_job_arm(struct drm_sched_job *job)
>>>>>>> +{
>>>>>>> + drm_sched_fence_init(job->s_fence, job->entity);
>>>>>>> +}
>>>>>>> +EXPORT_SYMBOL(drm_sched_job_arm);
>>>>>>> +
>>>>>>> +/**
>>>>>>> + * drm_sched_job_cleanup - clean up scheduler job resources
>>>>>>> * @job: scheduler job to clean up
>>>>>>> + *
>>>>>>> + * Cleans up the resources allocated with drm_sched_job_init().
>>>>>>> + *
>>>>>>> + * Drivers should call this from their error unwind code if @job is aborted
>>>>>>> + * before drm_sched_job_arm() is called.
>>>>>>> + *
>>>>>>> + * After that point of no return @job is committed to be executed by the
>>>>>>> + * scheduler, and this function should be called from the
>>>>>>> + * &drm_sched_backend_ops.free_job callback.
>>>>>>> */
>>>>>>> void drm_sched_job_cleanup(struct drm_sched_job *job)
>>>>>>> {
>>>>>>> - dma_fence_put(&job->s_fence->finished);
>>>>>>> + if (!kref_read(&job->s_fence->finished.refcount)) {
>>>>>>> + /* drm_sched_job_arm() has been called */
>>>>>>> + dma_fence_put(&job->s_fence->finished);
>>>>>>> + } else {
>>>>>>> + /* aborted job before committing to run it */
>>>>>>> + drm_sched_fence_free(&job->s_fence->finished.rcu);
>>>>>>> + }
>>>>>>> +
>>>>>>> job->s_fence = NULL;
>>>>>>> }
>>>>>>> EXPORT_SYMBOL(drm_sched_job_cleanup);
>>>>>>> diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
>>>>>>> index 4eb354226972..5c3a99027ecd 100644
>>>>>>> --- a/drivers/gpu/drm/v3d/v3d_gem.c
>>>>>>> +++ b/drivers/gpu/drm/v3d/v3d_gem.c
>>>>>>> @@ -475,6 +475,8 @@ v3d_push_job(struct v3d_file_priv *v3d_priv,
>>>>>>> if (ret)
>>>>>>> return ret;
>>>>>>>
>>>>>>> + drm_sched_job_arm(&job->base);
>>>>>>> +
>>>>>>> job->done_fence = dma_fence_get(&job->base.s_fence->finished);
>>>>>>>
>>>>>>> /* put by scheduler job completion */
>>>>>>> diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
>>>>>>> index 88ae7f331bb1..83afc3aa8e2f 100644
>>>>>>> --- a/include/drm/gpu_scheduler.h
>>>>>>> +++ b/include/drm/gpu_scheduler.h
>>>>>>> @@ -348,6 +348,7 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched);
>>>>>>> int drm_sched_job_init(struct drm_sched_job *job,
>>>>>>> struct drm_sched_entity *entity,
>>>>>>> void *owner);
>>>>>>> +void drm_sched_job_arm(struct drm_sched_job *job);
>>>>>>> void drm_sched_entity_modify_sched(struct drm_sched_entity *entity,
>>>>>>> struct drm_gpu_scheduler **sched_list,
>>>>>>> unsigned int num_sched_list);
>>>>>>> @@ -387,8 +388,12 @@ void drm_sched_entity_set_priority(struct drm_sched_entity *entity,
>>>>>>> enum drm_sched_priority priority);
>>>>>>> bool drm_sched_entity_is_ready(struct drm_sched_entity *entity);
>>>>>>>
>>>>>>> -struct drm_sched_fence *drm_sched_fence_create(
>>>>>>> +struct drm_sched_fence *drm_sched_fence_alloc(
>>>>>>> struct drm_sched_entity *s_entity, void *owner);
>>>>>>> +void drm_sched_fence_init(struct drm_sched_fence *fence,
>>>>>>> + struct drm_sched_entity *entity);
>>>>>>> +void drm_sched_fence_free(struct rcu_head *rcu);
>>>>>>> +
>>>>>>> void drm_sched_fence_scheduled(struct drm_sched_fence *fence);
>>>>>>> void drm_sched_fence_finished(struct drm_sched_fence *fence);
>>>>>>>
>
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