2 * Copyright 2015 Advanced Micro Devices, Inc.
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5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
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8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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24 #ifndef _DRM_GPU_SCHEDULER_H_
25 #define _DRM_GPU_SCHEDULER_H_
27 #include <drm/spsc_queue.h>
28 #include <linux/dma-fence.h>
30 struct drm_gpu_scheduler;
33 enum drm_sched_priority {
34 DRM_SCHED_PRIORITY_MIN,
35 DRM_SCHED_PRIORITY_LOW = DRM_SCHED_PRIORITY_MIN,
36 DRM_SCHED_PRIORITY_NORMAL,
37 DRM_SCHED_PRIORITY_HIGH_SW,
38 DRM_SCHED_PRIORITY_HIGH_HW,
39 DRM_SCHED_PRIORITY_KERNEL,
40 DRM_SCHED_PRIORITY_MAX,
41 DRM_SCHED_PRIORITY_INVALID = -1,
42 DRM_SCHED_PRIORITY_UNSET = -2
46 * drm_sched_entity - A wrapper around a job queue (typically attached
47 * to the DRM file_priv).
49 * Entities will emit jobs in order to their corresponding hardware
50 * ring, and the scheduler will alternate between entities based on
53 struct drm_sched_entity {
54 struct list_head list;
55 struct drm_sched_rq *rq;
57 struct drm_gpu_scheduler *sched;
59 struct spsc_queue job_queue;
62 uint64_t fence_context;
64 struct dma_fence *dependency;
65 struct dma_fence_cb cb;
66 atomic_t *guilty; /* points to ctx's guilty */
68 struct dma_fence *last_scheduled;
72 * Run queue is a set of entities scheduling command submissions for
73 * one specific ring. It implements the scheduling policy that selects
74 * the next entity to emit commands from.
78 struct list_head entities;
79 struct drm_sched_entity *current_entity;
82 struct drm_sched_fence {
83 struct dma_fence scheduled;
85 /* This fence is what will be signaled by the scheduler when
86 * the job is completed.
88 * When setting up an out fence for the job, you should use
89 * this, since it's available immediately upon
90 * drm_sched_job_init(), and the fence returned by the driver
91 * from run_job() won't be created until the dependencies have
94 struct dma_fence finished;
96 struct dma_fence_cb cb;
97 struct dma_fence *parent;
98 struct drm_gpu_scheduler *sched;
103 struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f);
106 * drm_sched_job - A job to be run by an entity.
108 * A job is created by the driver using drm_sched_job_init(), and
109 * should call drm_sched_entity_push_job() once it wants the scheduler
110 * to schedule the job.
112 struct drm_sched_job {
113 struct spsc_node queue_node;
114 struct drm_gpu_scheduler *sched;
115 struct drm_sched_fence *s_fence;
116 struct dma_fence_cb finish_cb;
117 struct work_struct finish_work;
118 struct list_head node;
119 struct delayed_work work_tdr;
122 enum drm_sched_priority s_priority;
123 struct drm_sched_entity *entity;
126 static inline bool drm_sched_invalidate_job(struct drm_sched_job *s_job,
129 return (s_job && atomic_inc_return(&s_job->karma) > threshold);
133 * Define the backend operations called by the scheduler,
134 * these functions should be implemented in driver side
136 struct drm_sched_backend_ops {
137 /* Called when the scheduler is considering scheduling this
138 * job next, to get another struct dma_fence for this job to
139 * block on. Once it returns NULL, run_job() may be called.
141 struct dma_fence *(*dependency)(struct drm_sched_job *sched_job,
142 struct drm_sched_entity *s_entity);
144 /* Called to execute the job once all of the dependencies have
145 * been resolved. This may be called multiple times, if
146 * timedout_job() has happened and drm_sched_job_recovery()
147 * decides to try it again.
149 struct dma_fence *(*run_job)(struct drm_sched_job *sched_job);
151 /* Called when a job has taken too long to execute, to trigger
154 void (*timedout_job)(struct drm_sched_job *sched_job);
156 /* Called once the job's finished fence has been signaled and
157 * it's time to clean it up.
159 void (*free_job)(struct drm_sched_job *sched_job);
163 * One scheduler is implemented for each hardware ring
165 struct drm_gpu_scheduler {
166 const struct drm_sched_backend_ops *ops;
167 uint32_t hw_submission_limit;
170 struct drm_sched_rq sched_rq[DRM_SCHED_PRIORITY_MAX];
171 wait_queue_head_t wake_up_worker;
172 wait_queue_head_t job_scheduled;
173 atomic_t hw_rq_count;
174 atomic64_t job_id_count;
175 struct task_struct *thread;
176 struct list_head ring_mirror_list;
177 spinlock_t job_list_lock;
181 int drm_sched_init(struct drm_gpu_scheduler *sched,
182 const struct drm_sched_backend_ops *ops,
183 uint32_t hw_submission, unsigned hang_limit, long timeout,
185 void drm_sched_fini(struct drm_gpu_scheduler *sched);
187 int drm_sched_entity_init(struct drm_gpu_scheduler *sched,
188 struct drm_sched_entity *entity,
189 struct drm_sched_rq *rq,
191 void drm_sched_entity_do_release(struct drm_gpu_scheduler *sched,
192 struct drm_sched_entity *entity);
193 void drm_sched_entity_cleanup(struct drm_gpu_scheduler *sched,
194 struct drm_sched_entity *entity);
195 void drm_sched_entity_fini(struct drm_gpu_scheduler *sched,
196 struct drm_sched_entity *entity);
197 void drm_sched_entity_push_job(struct drm_sched_job *sched_job,
198 struct drm_sched_entity *entity);
199 void drm_sched_entity_set_rq(struct drm_sched_entity *entity,
200 struct drm_sched_rq *rq);
202 struct drm_sched_fence *drm_sched_fence_create(
203 struct drm_sched_entity *s_entity, void *owner);
204 void drm_sched_fence_scheduled(struct drm_sched_fence *fence);
205 void drm_sched_fence_finished(struct drm_sched_fence *fence);
206 int drm_sched_job_init(struct drm_sched_job *job,
207 struct drm_gpu_scheduler *sched,
208 struct drm_sched_entity *entity,
210 void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched,
211 struct drm_sched_job *job);
212 void drm_sched_job_recovery(struct drm_gpu_scheduler *sched);
213 bool drm_sched_dependency_optimized(struct dma_fence* fence,
214 struct drm_sched_entity *entity);
215 void drm_sched_job_kickout(struct drm_sched_job *s_job);