drivers/gpu/drm/amd/scheduler/gpu_scheduler.h

   1 /*
   2  * Copyright 2015 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   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:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  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
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  */
  23
  24 #ifndef _GPU_SCHEDULER_H_
  25 #define _GPU_SCHEDULER_H_
  26
  27 #include <linux/kfifo.h>
  28 #include <linux/fence.h>
  29
  30 struct amd_gpu_scheduler;
  31 struct amd_sched_rq;
  32
  33 extern struct kmem_cache *sched_fence_slab;
  34 extern atomic_t sched_fence_slab_ref;
  35
  36 /**
  37  * A scheduler entity is a wrapper around a job queue or a group
  38  * of other entities. Entities take turns emitting jobs from their
  39  * job queues to corresponding hardware ring based on scheduling
  40  * policy.
  41 */
  42 struct amd_sched_entity {
  43         struct list_head                list;
  44         struct amd_sched_rq             *rq;
  45         struct amd_gpu_scheduler        *sched;
  46
  47         spinlock_t                      queue_lock;
  48         struct kfifo                    job_queue;
  49
  50         atomic_t                        fence_seq;
  51         uint64_t                        fence_context;
  52
  53         struct fence                    *dependency;
  54         struct fence_cb                 cb;
  55 };
  56
  57 /**
  58  * Run queue is a set of entities scheduling command submissions for
  59  * one specific ring. It implements the scheduling policy that selects
  60  * the next entity to emit commands from.
  61 */
  62 struct amd_sched_rq {
  63         spinlock_t              lock;
  64         struct list_head        entities;
  65         struct amd_sched_entity *current_entity;
  66 };
  67
  68 struct amd_sched_fence {
  69         struct fence                    base;
  70         struct fence_cb                 cb;
  71         struct amd_gpu_scheduler        *sched;
  72         spinlock_t                      lock;
  73         void                            *owner;
  74         struct delayed_work             dwork;
  75         struct list_head                list;
  76 };
  77
  78 struct amd_sched_job {
  79         struct amd_gpu_scheduler        *sched;
  80         struct amd_sched_entity         *s_entity;
  81         struct amd_sched_fence          *s_fence;
  82 };
  83
  84 extern const struct fence_ops amd_sched_fence_ops;
  85 static inline struct amd_sched_fence *to_amd_sched_fence(struct fence *f)
  86 {
  87         struct amd_sched_fence *__f = container_of(f, struct amd_sched_fence, base);
  88
  89         if (__f->base.ops == &amd_sched_fence_ops)
  90                 return __f;
  91
  92         return NULL;
  93 }
  94
  95 /**
  96  * Define the backend operations called by the scheduler,
  97  * these functions should be implemented in driver side
  98 */
  99 struct amd_sched_backend_ops {
 100         struct fence *(*dependency)(struct amd_sched_job *sched_job);
 101         struct fence *(*run_job)(struct amd_sched_job *sched_job);
 102 };
 103
 104 /**
 105  * One scheduler is implemented for each hardware ring
 106 */
 107 struct amd_gpu_scheduler {
 108         struct amd_sched_backend_ops    *ops;
 109         uint32_t                        hw_submission_limit;
 110         long                            timeout;
 111         const char                      *name;
 112         struct amd_sched_rq             sched_rq;
 113         struct amd_sched_rq             kernel_rq;
 114         wait_queue_head_t               wake_up_worker;
 115         wait_queue_head_t               job_scheduled;
 116         atomic_t                        hw_rq_count;
 117         struct list_head                fence_list;
 118         spinlock_t                      fence_list_lock;
 119         struct task_struct              *thread;
 120 };
 121
 122 int amd_sched_init(struct amd_gpu_scheduler *sched,
 123                    struct amd_sched_backend_ops *ops,
 124                    uint32_t hw_submission, long timeout, const char *name);
 125 void amd_sched_fini(struct amd_gpu_scheduler *sched);
 126
 127 int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
 128                           struct amd_sched_entity *entity,
 129                           struct amd_sched_rq *rq,
 130                           uint32_t jobs);
 131 void amd_sched_entity_fini(struct amd_gpu_scheduler *sched,
 132                            struct amd_sched_entity *entity);
 133 void amd_sched_entity_push_job(struct amd_sched_job *sched_job);
 134
 135 struct amd_sched_fence *amd_sched_fence_create(
 136         struct amd_sched_entity *s_entity, void *owner);
 137 void amd_sched_fence_signal(struct amd_sched_fence *fence);
 138
 139
 140 #endif