Re: [PATCH] drm/sched: Split drm_sched_job_init

On Thu, Jun 24, 2021 at 11:00 PM Emma Anholt emma@anholt.net wrote:

On Thu, Jun 24, 2021 at 1:45 PM Daniel Vetter daniel.vetter@ffwll.ch wrote:

...

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)

Acked-by: Steven Price steven.price@arm.com Signed-off-by: Daniel Vetter daniel.vetter@intel.com 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: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel@ffwll.ch Cc: Sumit Semwal sumit.semwal@linaro.org Cc: "Christian König" christian.koenig@amd.com Cc: Masahiro Yamada masahiroy@kernel.org Cc: Kees Cook keescook@chromium.org Cc: Adam Borowski kilobyte@angband.pl Cc: Nick Terrell terrelln@fb.com Cc: Mauro Carvalho Chehab mchehab+huawei@kernel.org Cc: Paul Menzel pmenzel@molgen.mpg.de Cc: Sami Tolvanen samitolvanen@google.com Cc: Viresh Kumar viresh.kumar@linaro.org Cc: Alex Deucher alexander.deucher@amd.com Cc: Dave Airlie airlied@redhat.com Cc: Nirmoy Das nirmoy.das@amd.com Cc: Deepak R Varma mh12gx2825@gmail.com Cc: Lee Jones lee.jones@linaro.org Cc: Kevin Wang kevin1.wang@amd.com Cc: Chen Li chenli@uniontech.com Cc: Luben Tuikov luben.tuikov@amd.com Cc: "Marek Olšák" marek.olsak@amd.com Cc: Dennis Li Dennis.Li@amd.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Andrey Grodzovsky andrey.grodzovsky@amd.com Cc: Sonny Jiang sonny.jiang@amd.com Cc: Boris Brezillon boris.brezillon@collabora.com Cc: Tian Tao tiantao6@hisilicon.com Cc: Jack Zhang Jack.Zhang1@amd.com Cc: etnaviv@lists.freedesktop.org Cc: lima@lists.freedesktop.org Cc: linux-media@vger.kernel.org Cc: linaro-mm-sig@lists.linaro.org Cc: Emma Anholt emma@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 | 15 ++++++++++----- drivers/gpu/drm/scheduler/sched_main.c | 23 ++++++++++++++++++++++- drivers/gpu/drm/v3d/v3d_gem.c | 2 ++ include/drm/gpu_scheduler.h | 6 +++++- 10 files changed, 52 insertions(+), 10 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 19826e504efc..af1671f01c7f 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 ecf3267334ff..bd1af1fd8c0f 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 beb62c8fc851..1e950534b9b0 100644 --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -244,6 +244,8 @@ 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..0ba810c198bd 100644 --- a/drivers/gpu/drm/scheduler/sched_fence.c +++ b/drivers/gpu/drm/scheduler/sched_fence.c @@ -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;
  

+}

If there's an error path between fence_alloc (job_init()) and fence_create() (job_arm()) time, how does the s_fence get freed? Before, I was committed to calling drm_sched_entity_push_job() which lead to the job being processed and freed, but now I think we need some other non-pushed-job free path.

Yeah I need to fix that in each driver when I move the drm_sched_job_init around. From a quick look I just need to move the drm_sched_job_cleanup() call around slightly in each case, but it's a bit too late to do that without screwing it up for sure. I'll look into that tomorrow. -Daniel

...

+EXPORT_SYMBOL(drm_sched_job_arm);

/**

• drm_sched_job_cleanup - clean up scheduler job resources

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 d18af49fd009..80438d126c9d 100644 --- a/include/drm/gpu_scheduler.h +++ b/include/drm/gpu_scheduler.h @@ -313,6 +313,7 @@ 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); @@ -352,8 +353,11 @@ 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_scheduled(struct drm_sched_fence *fence); void drm_sched_fence_finished(struct drm_sched_fence *fence);

-- 2.32.0.rc2