| /* |
| * Copyright 2015 Advanced Micro Devices, Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| */ |
| |
| #ifndef _DRM_GPU_SCHEDULER_H_ |
| #define _DRM_GPU_SCHEDULER_H_ |
| |
| #include <drm/spsc_queue.h> |
| #include <linux/dma-fence.h> |
| #include <linux/completion.h> |
| |
| #define MAX_WAIT_SCHED_ENTITY_Q_EMPTY msecs_to_jiffies(1000) |
| |
| struct drm_gpu_scheduler; |
| struct drm_sched_rq; |
| |
| enum drm_sched_priority { |
| DRM_SCHED_PRIORITY_MIN, |
| DRM_SCHED_PRIORITY_LOW = DRM_SCHED_PRIORITY_MIN, |
| DRM_SCHED_PRIORITY_NORMAL, |
| DRM_SCHED_PRIORITY_HIGH_SW, |
| DRM_SCHED_PRIORITY_HIGH_HW, |
| DRM_SCHED_PRIORITY_KERNEL, |
| DRM_SCHED_PRIORITY_MAX, |
| DRM_SCHED_PRIORITY_INVALID = -1, |
| DRM_SCHED_PRIORITY_UNSET = -2 |
| }; |
| |
| /** |
| * 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 on which this entity is currently scheduled. |
| * @sched_list: A list of schedulers (drm_gpu_schedulers). |
| * Jobs from this entity can be scheduled on any scheduler |
| * on this list. |
| * @num_sched_list: number of drm_gpu_schedulers in the sched_list. |
| * @priority: priority of the entity |
| * @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. |
| * @stopped: Marks the enity as removed from rq and destined for termination. |
| * @entity_idle: Signals when enityt is not in use |
| * |
| * 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; |
| struct drm_gpu_scheduler **sched_list; |
| unsigned int num_sched_list; |
| enum drm_sched_priority priority; |
| spinlock_t rq_lock; |
| |
| struct spsc_queue job_queue; |
| |
| atomic_t fence_seq; |
| uint64_t fence_context; |
| |
| struct dma_fence *dependency; |
| struct dma_fence_cb cb; |
| atomic_t *guilty; |
| struct dma_fence *last_scheduled; |
| struct task_struct *last_user; |
| bool stopped; |
| struct completion entity_idle; |
| }; |
| |
| /** |
| * 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; |
| |
| /** |
| * @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. |
| * @node: used to append this struct to the @drm_gpu_scheduler.ring_mirror_list. |
| * @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. |
| * @cb: the callback for the parent fence in s_fence. |
| * |
| * 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; |
| struct drm_sched_fence *s_fence; |
| struct dma_fence_cb finish_cb; |
| struct list_head node; |
| uint64_t id; |
| atomic_t karma; |
| enum drm_sched_priority s_priority; |
| struct drm_sched_entity *entity; |
| struct dma_fence_cb cb; |
| }; |
| |
| static inline bool drm_sched_invalidate_job(struct drm_sched_job *s_job, |
| int threshold) |
| { |
| return (s_job && atomic_inc_return(&s_job->karma) > threshold); |
| } |
| |
| /** |
| * struct drm_sched_backend_ops |
| * |
| * Define the backend operations called by the scheduler, |
| * 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); |
| }; |
| |
| /** |
| * 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. |
| * @work_tdr: schedules a delayed call to @drm_sched_job_timedout after the |
| * timeout interval is over. |
| * @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. |
| * @score: score to help loadbalancer pick a idle sched |
| * @ready: marks if the underlying HW is ready to work |
| * @free_guilty: A hit to time out handler to free the guilty job. |
| * |
| * One scheduler is implemented for each hardware ring. |
| */ |
| struct drm_gpu_scheduler { |
| const struct drm_sched_backend_ops *ops; |
| uint32_t hw_submission_limit; |
| long timeout; |
| const char *name; |
| struct drm_sched_rq sched_rq[DRM_SCHED_PRIORITY_MAX]; |
| wait_queue_head_t wake_up_worker; |
| wait_queue_head_t job_scheduled; |
| atomic_t hw_rq_count; |
| atomic64_t job_id_count; |
| struct delayed_work work_tdr; |
| struct task_struct *thread; |
| struct list_head ring_mirror_list; |
| spinlock_t job_list_lock; |
| int hang_limit; |
| atomic_t score; |
| bool ready; |
| bool free_guilty; |
| }; |
| |
| int drm_sched_init(struct drm_gpu_scheduler *sched, |
| const struct drm_sched_backend_ops *ops, |
| uint32_t hw_submission, unsigned hang_limit, long timeout, |
| const char *name); |
| |
| 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_entity_modify_sched(struct drm_sched_entity *entity, |
| struct drm_gpu_scheduler **sched_list, |
| unsigned int num_sched_list); |
| |
| void drm_sched_job_cleanup(struct drm_sched_job *job); |
| void drm_sched_wakeup(struct drm_gpu_scheduler *sched); |
| void drm_sched_stop(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad); |
| void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery); |
| void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched); |
| void drm_sched_increase_karma(struct drm_sched_job *bad); |
| bool drm_sched_dependency_optimized(struct dma_fence* fence, |
| struct drm_sched_entity *entity); |
| void drm_sched_fault(struct drm_gpu_scheduler *sched); |
| void drm_sched_job_kickout(struct drm_sched_job *s_job); |
| |
| void drm_sched_rq_add_entity(struct drm_sched_rq *rq, |
| struct drm_sched_entity *entity); |
| void drm_sched_rq_remove_entity(struct drm_sched_rq *rq, |
| struct drm_sched_entity *entity); |
| |
| int drm_sched_entity_init(struct drm_sched_entity *entity, |
| enum drm_sched_priority priority, |
| struct drm_gpu_scheduler **sched_list, |
| unsigned int num_sched_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_select_rq(struct drm_sched_entity *entity); |
| struct drm_sched_job *drm_sched_entity_pop_job(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_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_entity *s_entity, void *owner); |
| void drm_sched_fence_scheduled(struct drm_sched_fence *fence); |
| void drm_sched_fence_finished(struct drm_sched_fence *fence); |
| |
| unsigned long drm_sched_suspend_timeout(struct drm_gpu_scheduler *sched); |
| void drm_sched_resume_timeout(struct drm_gpu_scheduler *sched, |
| unsigned long remaining); |
| struct drm_gpu_scheduler * |
| drm_sched_pick_best(struct drm_gpu_scheduler **sched_list, |
| unsigned int num_sched_list); |
| |
| #endif |