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drm/sched: Extend the documentation.

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These comments answer all the questions I had for myself when
implementing a driver using the GPU scheduler.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Anholt 2018-04-04 15:32:51 -07:00 committed by Alex Deucher
parent 552825b28d
commit 1a61ee0721
1 changed files with 42 additions and 4 deletions
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46
include/drm/gpu_scheduler.h
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@ -43,10 +43,12 @@ enum drm_sched_priority {
};
/**
* A scheduler entity is a wrapper around a job queue or a group
* of other entities. Entities take turns emitting jobs from their
* job queues to corresponding hardware ring based on scheduling
* policy.
* drm_sched_entity - A wrapper around a job queue (typically attached
* to the DRM file_priv).
*
* Entities will emit jobs in order to their corresponding hardware
* ring, and the scheduler will alternate between entities based on
* scheduling policy.
*/
struct drm_sched_entity {
struct list_head list;
@ -78,7 +80,18 @@ struct drm_sched_rq {
struct drm_sched_fence {
struct dma_fence scheduled;
/* This fence is what will be signaled by the scheduler when
* the job is completed.
*
* When setting up an out fence for the job, you should use
* this, since it's available immediately upon
* drm_sched_job_init(), and the fence returned by the driver
* from run_job() won't be created until the dependencies have
* resolved.
*/
struct dma_fence finished;
struct dma_fence_cb cb;
struct dma_fence *parent;
struct drm_gpu_scheduler *sched;
@ -88,6 +101,13 @@ struct drm_sched_fence {
struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f);
/**
* drm_sched_job - A job to be run by an entity.
*
* A job is created by the driver using drm_sched_job_init(), and
* should call drm_sched_entity_push_job() once it wants the scheduler
* to schedule the job.
*/
struct drm_sched_job {
struct spsc_node queue_node;
struct drm_gpu_scheduler *sched;
@ -112,10 +132,28 @@ static inline bool drm_sched_invalidate_job(struct drm_sched_job *s_job,
* these functions should be implemented in driver side
*/
struct drm_sched_backend_ops {
/* Called when the scheduler is considering scheduling this
* job next, to get another struct dma_fence for this job to
* block on. Once it returns NULL, run_job() may be called.
*/
struct dma_fence *(*dependency)(struct drm_sched_job *sched_job,
struct drm_sched_entity *s_entity);
/* Called to execute the job once all of the dependencies have
* been resolved. This may be called multiple times, if
* timedout_job() has happened and drm_sched_job_recovery()
* decides to try it again.
*/
struct dma_fence *(*run_job)(struct drm_sched_job *sched_job);
/* Called when a job has taken too long to execute, to trigger
* GPU recovery.
*/
void (*timedout_job)(struct drm_sched_job *sched_job);
/* Called once the job's finished fence has been signaled and
* it's time to clean it up.
*/
void (*free_job)(struct drm_sched_job *sched_job);
};