Re: [Intel-gfx] [PATCH v5 07/20] drm/panfrost: use scheduler dependency tracking

Alyssa Rosenzweig
2021-08-05T21:29:19Z

Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

On Thu, Aug 05, 2021 at 12:46:52PM +0200, Daniel Vetter wrote:
> Just deletes some code that's now more shared.
>
> Note that thanks to the split into drm_sched_job_init/arm we can now
> easily pull the _init() part from under the submission lock way ahead
> where we're adding the sync file in-fences as dependencies.
>
> v2: Correctly clean up the partially set up job, now that job_init()
> and job_arm() are apart (Emma).
>
> v3: Rebased over renamed functions for adding depdencies
>
> Acked-by: Emma Anholt <emma@anholt.net>
> Reviewed-by: Steven Price <steven.price@arm.com> (v3)
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.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: Sumit Semwal <sumit.semwal@linaro.org>
> Cc: "Christian K??nig" <christian.koenig@amd.com>
> Cc: linux-media@vger.kernel.org
> Cc: linaro-mm-sig@lists.linaro.org
> Cc: Emma Anholt <emma@anholt.net>
> ---
> drivers/gpu/drm/panfrost/panfrost_drv.c | 16 ++++++++---
> drivers/gpu/drm/panfrost/panfrost_job.c | 38 ++++---------------------
> drivers/gpu/drm/panfrost/panfrost_job.h | 5 +---
> 3 files changed, 18 insertions(+), 41 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
> index 1ffaef5ec5ff..16212b6b202e 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
> @@ -218,7 +218,7 @@ panfrost_copy_in_sync(struct drm_device *dev,
> if (ret)
> goto fail;
>
> - ret = drm_gem_fence_array_add(&job->deps, fence);
> + ret = drm_sched_job_add_dependency(&job->base, fence);
>
> if (ret)
> goto fail;
> @@ -236,7 +236,7 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
> struct drm_panfrost_submit *args = data;
> struct drm_syncobj *sync_out = NULL;
> struct panfrost_job *job;
> - int ret = 0;
> + int ret = 0, slot;
>
> if (!args->jc)
> return -EINVAL;
> @@ -258,14 +258,20 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
>
> kref_init(&job->refcount);
>
> - xa_init_flags(&job->deps, XA_FLAGS_ALLOC);
> -
> job->pfdev = pfdev;
> job->jc = args->jc;
> job->requirements = args->requirements;
> job->flush_id = panfrost_gpu_get_latest_flush_id(pfdev);
> job->file_priv = file->driver_priv;
>
> + slot = panfrost_job_get_slot(job);
> +
> + ret = drm_sched_job_init(&job->base,
> + &job->file_priv->sched_entity[slot],
> + NULL);
> + if (ret)
> + goto fail_job_put;
> +
> ret = panfrost_copy_in_sync(dev, file, args, job);
> if (ret)
> goto fail_job;
> @@ -283,6 +289,8 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
> drm_syncobj_replace_fence(sync_out, job->render_done_fence);
>
> fail_job:
> + drm_sched_job_cleanup(&job->base);
> +fail_job_put:
> panfrost_job_put(job);
> fail_out_sync:
> if (sync_out)
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
> index 4bc962763e1f..a98f507dc779 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -102,7 +102,7 @@ static struct dma_fence *panfrost_fence_create(struct panfrost_device *pfdev, in
> return &fence->base;
> }
>
> -static int panfrost_job_get_slot(struct panfrost_job *job)
> +int panfrost_job_get_slot(struct panfrost_job *job)
> {
> /* JS0: fragment jobs.
> * JS1: vertex/tiler jobs
> @@ -242,13 +242,14 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
>
> static int panfrost_acquire_object_fences(struct drm_gem_object **bos,
> int bo_count,
> - struct xarray *deps)
> + struct drm_sched_job *job)
> {
> int i, ret;
>
> for (i = 0; i < bo_count; i++) {
> /* panfrost always uses write mode in its current uapi */
> - ret = drm_gem_fence_array_add_implicit(deps, bos[i], true);
> + ret = drm_sched_job_add_implicit_dependencies(job, bos[i],
> + true);
> if (ret)
> return ret;
> }
> @@ -269,31 +270,21 @@ static void panfrost_attach_object_fences(struct drm_gem_object **bos,
> int panfrost_job_push(struct panfrost_job *job)
> {
> struct panfrost_device *pfdev = job->pfdev;
> - int slot = panfrost_job_get_slot(job);
> - struct drm_sched_entity *entity = &job->file_priv->sched_entity[slot];
> struct ww_acquire_ctx acquire_ctx;
> int ret = 0;
>
> -
> ret = drm_gem_lock_reservations(job->bos, job->bo_count,
> &acquire_ctx);
> if (ret)
> return ret;
>
> mutex_lock(&pfdev->sched_lock);
> -
> - ret = drm_sched_job_init(&job->base, entity, NULL);
> - if (ret) {
> - mutex_unlock(&pfdev->sched_lock);
> - 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,
> - &job->deps);
> + &job->base);
> if (ret) {
> mutex_unlock(&pfdev->sched_lock);
> goto unlock;
> @@ -318,15 +309,8 @@ static void panfrost_job_cleanup(struct kref *ref)
> {
> struct panfrost_job *job = container_of(ref, struct panfrost_job,
> refcount);
> - struct dma_fence *fence;
> - unsigned long index;
> unsigned int i;
>
> - xa_for_each(&job->deps, index, fence) {
> - dma_fence_put(fence);
> - }
> - xa_destroy(&job->deps);
> -
> dma_fence_put(job->done_fence);
> dma_fence_put(job->render_done_fence);
>
> @@ -365,17 +349,6 @@ static void panfrost_job_free(struct drm_sched_job *sched_job)
> panfrost_job_put(job);
> }
>
> -static struct dma_fence *panfrost_job_dependency(struct drm_sched_job *sched_job,
> - struct drm_sched_entity *s_entity)
> -{
> - struct panfrost_job *job = to_panfrost_job(sched_job);
> -
> - if (!xa_empty(&job->deps))
> - return xa_erase(&job->deps, job->last_dep++);
> -
> - return NULL;
> -}
> -
> static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
> {
> struct panfrost_job *job = to_panfrost_job(sched_job);
> @@ -765,7 +738,6 @@ static void panfrost_reset_work(struct work_struct *work)
> }
>
> static const struct drm_sched_backend_ops panfrost_sched_ops = {
> - .dependency = panfrost_job_dependency,
> .run_job = panfrost_job_run,
> .timedout_job = panfrost_job_timedout,
> .free_job = panfrost_job_free
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.h b/drivers/gpu/drm/panfrost/panfrost_job.h
> index 82306a03b57e..77e6d0e6f612 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.h
> @@ -19,10 +19,6 @@ struct panfrost_job {
> struct panfrost_device *pfdev;
> struct panfrost_file_priv *file_priv;
>
> - /* Contains both explicit and implicit fences */
> - struct xarray deps;
> - unsigned long last_dep;
> -
> /* Fence to be signaled by IRQ handler when the job is complete. */
> struct dma_fence *done_fence;
>
> @@ -42,6 +38,7 @@ int panfrost_job_init(struct panfrost_device *pfdev);
> void panfrost_job_fini(struct panfrost_device *pfdev);
> int panfrost_job_open(struct panfrost_file_priv *panfrost_priv);
> void panfrost_job_close(struct panfrost_file_priv *panfrost_priv);
> +int panfrost_job_get_slot(struct panfrost_job *job);
> int panfrost_job_push(struct panfrost_job *job);
> void panfrost_job_put(struct panfrost_job *job);
> void panfrost_job_enable_interrupts(struct panfrost_device *pfdev);
> --
> 2.32.0
>