diff options
Diffstat (limited to 'include/drm/gpu_scheduler.h')
| -rw-r--r-- | include/drm/gpu_scheduler.h | 178 |
1 files changed, 158 insertions, 20 deletions
diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h index dfd54fb94e10..21c648b0b2a1 100644 --- a/include/drm/gpu_scheduler.h +++ b/include/drm/gpu_scheduler.h @@ -27,6 +27,8 @@ #include <drm/spsc_queue.h> #include <linux/dma-fence.h> +#define MAX_WAIT_SCHED_ENTITY_Q_EMPTY msecs_to_jiffies(1000) + struct drm_gpu_scheduler; struct drm_sched_rq; @@ -43,18 +45,38 @@ 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. -*/ + * struct drm_sched_entity - A wrapper around a job queue (typically + * attached to the DRM file_priv). + * + * @list: used to append this struct to the list of entities in the + * runqueue. + * @rq: runqueue to which this entity belongs. + * @rq_lock: lock to modify the runqueue to which this entity belongs. + * @job_queue: the list of jobs of this entity. + * @fence_seq: a linearly increasing seqno incremented with each + * new &drm_sched_fence which is part of the entity. + * @fence_context: a unique context for all the fences which belong + * to this entity. + * The &drm_sched_fence.scheduled uses the + * fence_context but &drm_sched_fence.finished uses + * fence_context + 1. + * @dependency: the dependency fence of the job which is on the top + * of the job queue. + * @cb: callback for the dependency fence above. + * @guilty: points to ctx's guilty. + * @fini_status: contains the exit status in case the process was signalled. + * @last_scheduled: points to the finished fence of the last scheduled job. + * @last_user: last group leader pushing a job into the entity. + * + * 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; struct drm_sched_rq *rq; spinlock_t rq_lock; - struct drm_gpu_scheduler *sched; - spinlock_t queue_lock; struct spsc_queue job_queue; atomic_t fence_seq; @@ -62,32 +84,103 @@ struct drm_sched_entity { struct dma_fence *dependency; struct dma_fence_cb cb; - atomic_t *guilty; /* points to ctx's guilty */ + atomic_t *guilty; + struct dma_fence *last_scheduled; + struct task_struct *last_user; }; /** + * struct drm_sched_rq - queue of entities to be scheduled. + * + * @lock: to modify the entities list. + * @sched: the scheduler to which this rq belongs to. + * @entities: list of the entities to be scheduled. + * @current_entity: the entity which is to be scheduled. + * * Run queue is a set of entities scheduling command submissions for * one specific ring. It implements the scheduling policy that selects * the next entity to emit commands from. -*/ + */ struct drm_sched_rq { spinlock_t lock; + struct drm_gpu_scheduler *sched; struct list_head entities; struct drm_sched_entity *current_entity; }; +/** + * struct drm_sched_fence - fences corresponding to the scheduling of a job. + */ struct drm_sched_fence { + /** + * @scheduled: this fence is what will be signaled by the scheduler + * when the job is scheduled. + */ struct dma_fence scheduled; + + /** + * @finished: 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; + + /** + * @cb: the callback for the parent fence below. + */ struct dma_fence_cb cb; + /** + * @parent: the fence returned by &drm_sched_backend_ops.run_job + * when scheduling the job on hardware. We signal the + * &drm_sched_fence.finished fence once parent is signalled. + */ struct dma_fence *parent; + /** + * @sched: the scheduler instance to which the job having this struct + * belongs to. + */ struct drm_gpu_scheduler *sched; + /** + * @lock: the lock used by the scheduled and the finished fences. + */ spinlock_t lock; + /** + * @owner: job owner for debugging + */ void *owner; }; struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f); +/** + * struct drm_sched_job - A job to be run by an entity. + * + * @queue_node: used to append this struct to the queue of jobs in an entity. + * @sched: the scheduler instance on which this job is scheduled. + * @s_fence: contains the fences for the scheduling of job. + * @finish_cb: the callback for the finished fence. + * @finish_work: schedules the function @drm_sched_job_finish once the job has + * finished to remove the job from the + * @drm_gpu_scheduler.ring_mirror_list. + * @node: used to append this struct to the @drm_gpu_scheduler.ring_mirror_list. + * @work_tdr: schedules a delayed call to @drm_sched_job_timedout after the timeout + * interval is over. + * @id: a unique id assigned to each job scheduled on the scheduler. + * @karma: increment on every hang caused by this job. If this exceeds the hang + * limit of the scheduler then the job is marked guilty and will not + * be scheduled further. + * @s_priority: the priority of the job. + * @entity: the entity to which this job belongs. + * + * 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; @@ -99,6 +192,7 @@ struct drm_sched_job { uint64_t id; atomic_t karma; enum drm_sched_priority s_priority; + struct drm_sched_entity *entity; }; static inline bool drm_sched_invalidate_job(struct drm_sched_job *s_job, @@ -108,20 +202,64 @@ static inline bool drm_sched_invalidate_job(struct drm_sched_job *s_job, } /** + * struct drm_sched_backend_ops + * * Define the backend operations called by the scheduler, - * these functions should be implemented in driver side -*/ + * these functions should be implemented in driver side. + */ struct drm_sched_backend_ops { + /** + * @dependency: 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); + + /** + * @run_job: 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); + + /** + * @timedout_job: Called when a job has taken too long to execute, + * to trigger GPU recovery. + */ void (*timedout_job)(struct drm_sched_job *sched_job); + + /** + * @free_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); }; /** - * One scheduler is implemented for each hardware ring -*/ + * struct drm_gpu_scheduler + * + * @ops: backend operations provided by the driver. + * @hw_submission_limit: the max size of the hardware queue. + * @timeout: the time after which a job is removed from the scheduler. + * @name: name of the ring for which this scheduler is being used. + * @sched_rq: priority wise array of run queues. + * @wake_up_worker: the wait queue on which the scheduler sleeps until a job + * is ready to be scheduled. + * @job_scheduled: once @drm_sched_entity_do_release is called the scheduler + * waits on this wait queue until all the scheduled jobs are + * finished. + * @hw_rq_count: the number of jobs currently in the hardware queue. + * @job_id_count: used to assign unique id to the each job. + * @thread: the kthread on which the scheduler which run. + * @ring_mirror_list: the list of jobs which are currently in the job queue. + * @job_list_lock: lock to protect the ring_mirror_list. + * @hang_limit: once the hangs by a job crosses this limit then it is marked + * guilty and it will be considered for scheduling further. + * + * One scheduler is implemented for each hardware ring. + */ struct drm_gpu_scheduler { const struct drm_sched_backend_ops *ops; uint32_t hw_submission_limit; @@ -144,12 +282,13 @@ int drm_sched_init(struct drm_gpu_scheduler *sched, const char *name); void drm_sched_fini(struct drm_gpu_scheduler *sched); -int drm_sched_entity_init(struct drm_gpu_scheduler *sched, - struct drm_sched_entity *entity, - struct drm_sched_rq *rq, - uint32_t jobs, atomic_t *guilty); -void drm_sched_entity_fini(struct drm_gpu_scheduler *sched, - struct drm_sched_entity *entity); +int drm_sched_entity_init(struct drm_sched_entity *entity, + struct drm_sched_rq **rq_list, + unsigned int num_rq_list, + atomic_t *guilty); +long drm_sched_entity_flush(struct drm_sched_entity *entity, long timeout); +void drm_sched_entity_fini(struct drm_sched_entity *entity); +void drm_sched_entity_destroy(struct drm_sched_entity *entity); void drm_sched_entity_push_job(struct drm_sched_job *sched_job, struct drm_sched_entity *entity); void drm_sched_entity_set_rq(struct drm_sched_entity *entity, @@ -160,7 +299,6 @@ struct drm_sched_fence *drm_sched_fence_create( void drm_sched_fence_scheduled(struct drm_sched_fence *fence); void drm_sched_fence_finished(struct drm_sched_fence *fence); int drm_sched_job_init(struct drm_sched_job *job, - struct drm_gpu_scheduler *sched, struct drm_sched_entity *entity, void *owner); void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched, |