v4.19.13 snapshot.
diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
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+++ b/include/drm/gpu_scheduler.h
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+/*
+ * 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>
+
+#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 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 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;
+};
+
+/**
+ * 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;
+ struct drm_sched_fence *s_fence;
+ struct dma_fence_cb finish_cb;
+ struct work_struct finish_work;
+ struct list_head node;
+ struct delayed_work work_tdr;
+ 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,
+ 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.
+ * @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;
+ 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 task_struct *thread;
+ struct list_head ring_mirror_list;
+ spinlock_t job_list_lock;
+ int hang_limit;
+};
+
+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_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,
+ struct drm_sched_rq *rq);
+
+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);
+int drm_sched_job_init(struct drm_sched_job *job,
+ struct drm_sched_entity *entity,
+ void *owner);
+void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched,
+ struct drm_sched_job *job);
+void drm_sched_job_recovery(struct drm_gpu_scheduler *sched);
+bool drm_sched_dependency_optimized(struct dma_fence* fence,
+ struct drm_sched_entity *entity);
+void drm_sched_job_kickout(struct drm_sched_job *s_job);
+
+#endif