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 #define AMD_SCHED_FENCE_SCHEDULED_BIT   FENCE_FLAG_USER_BITS
  31
  32 struct amd_gpu_scheduler;
  33 struct amd_sched_rq;
  34
  35 extern struct kmem_cache *sched_fence_slab;
  36 extern atomic_t sched_fence_slab_ref;
  37
  38 /**
  39  * A scheduler entity is a wrapper around a job queue or a group
  40  * of other entities. Entities take turns emitting jobs from their
  41  * job queues to corresponding hardware ring based on scheduling
  42  * policy.
  43 */
  44 struct amd_sched_entity {
  45         struct list_head                list;
  46         struct amd_sched_rq             *rq;
  47         struct amd_gpu_scheduler        *sched;
  48
  49         spinlock_t                      queue_lock;
  50         struct kfifo                    job_queue;
  51
  52         atomic_t                        fence_seq;
  53         uint64_t                        fence_context;
  54
  55         struct fence                    *dependency;
  56         struct fence_cb                 cb;
  57 };
  58
  59 /**
  60  * Run queue is a set of entities scheduling command submissions for
  61  * one specific ring. It implements the scheduling policy that selects
  62  * the next entity to emit commands from.
  63 */
  64 struct amd_sched_rq {
  65         spinlock_t              lock;
  66         struct list_head        entities;
  67         struct amd_sched_entity *current_entity;
  68 };
  69
  70 struct amd_sched_fence {
  71         struct fence                    base;
  72         struct fence_cb                 cb;
  73         struct list_head                scheduled_cb;
  74         struct amd_gpu_scheduler        *sched;
  75         spinlock_t                      lock;
  76         void                            *owner;
  77         struct amd_sched_job    *s_job;
  78 };
  79
  80 struct amd_sched_job {
  81         struct kref refcount;
  82         struct amd_gpu_scheduler        *sched;
  83         struct amd_sched_entity         *s_entity;
  84         struct amd_sched_fence          *s_fence;
  85         bool    use_sched;      /* true if the job goes to scheduler */
  86         struct fence_cb                cb_free_job;
  87         struct work_struct             work_free_job;
  88         struct list_head                           node;
  89         struct delayed_work work_tdr;
  90         void (*free_callback)(struct kref *refcount);
  91 };
  92
  93 extern const struct fence_ops amd_sched_fence_ops;
  94 static inline struct amd_sched_fence *to_amd_sched_fence(struct fence *f)
  95 {
  96         struct amd_sched_fence *__f = container_of(f, struct amd_sched_fence,
  97                                                    base);
  98
  99         if (__f->base.ops == &amd_sched_fence_ops)
 100                 return __f;
 101
 102         return NULL;
 103 }
 104
 105 /**
 106  * Define the backend operations called by the scheduler,
 107  * these functions should be implemented in driver side
 108 */
 109 struct amd_sched_backend_ops {
 110         struct fence *(*dependency)(struct amd_sched_job *sched_job);
 111         struct fence *(*run_job)(struct amd_sched_job *sched_job);
 112 };
 113
 114 enum amd_sched_priority {
 115         AMD_SCHED_PRIORITY_KERNEL = 0,
 116         AMD_SCHED_PRIORITY_NORMAL,
 117         AMD_SCHED_MAX_PRIORITY
 118 };
 119
 120 /**
 121  * One scheduler is implemented for each hardware ring
 122 */
 123 struct amd_gpu_scheduler {
 124         const struct amd_sched_backend_ops      *ops;
 125         uint32_t                        hw_submission_limit;
 126         long                            timeout;
 127         const char                      *name;
 128         struct amd_sched_rq             sched_rq[AMD_SCHED_MAX_PRIORITY];
 129         wait_queue_head_t               wake_up_worker;
 130         wait_queue_head_t               job_scheduled;
 131         atomic_t                        hw_rq_count;
 132         struct task_struct              *thread;
 133         struct list_head        ring_mirror_list;
 134         spinlock_t                      job_list_lock;
 135 };
 136
 137 int amd_sched_init(struct amd_gpu_scheduler *sched,
 138                    const struct amd_sched_backend_ops *ops,
 139                    uint32_t hw_submission, long timeout, const char *name);
 140 void amd_sched_fini(struct amd_gpu_scheduler *sched);
 141
 142 int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
 143                           struct amd_sched_entity *entity,
 144                           struct amd_sched_rq *rq,
 145                           uint32_t jobs);
 146 void amd_sched_entity_fini(struct amd_gpu_scheduler *sched,
 147                            struct amd_sched_entity *entity);
 148 void amd_sched_entity_push_job(struct amd_sched_job *sched_job);
 149
 150 struct amd_sched_fence *amd_sched_fence_create(
 151         struct amd_sched_entity *s_entity, void *owner);
 152 void amd_sched_fence_scheduled(struct amd_sched_fence *fence);
 153 void amd_sched_fence_signal(struct amd_sched_fence *fence);
 154 int amd_sched_job_init(struct amd_sched_job *job,
 155                        struct amd_gpu_scheduler *sched,
 156                        struct amd_sched_entity *entity,
 157                        void (*timeout_cb)(struct work_struct *work),
 158                        void (*free_cb)(struct kref* refcount),
 159                        void *owner, struct fence **fence);
 160 static inline void amd_sched_job_get(struct amd_sched_job *job)
 161 {
 162         if (job)
 163                 kref_get(&job->refcount);
 164 }
 165
 166 static inline void amd_sched_job_put(struct amd_sched_job *job)
 167 {
 168         if (job)
 169                 kref_put(&job->refcount, job->free_callback);
 170 }
 171
 172 #endif