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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 _GPU_SCHEDULER_H_
#define _GPU_SCHEDULER_H_
#include <linux/kfifo.h>
#include <linux/fence.h>
#define AMD_SCHED_FENCE_SCHEDULED_BIT FENCE_FLAG_USER_BITS
struct amd_gpu_scheduler;
struct amd_sched_rq;
extern struct kmem_cache *sched_fence_slab;
extern atomic_t sched_fence_slab_ref;
/**
* A scheduler entity is a wrapper around a job queue or a group
* of other entities. Entities take turns emitting jobs from their
* job queues to corresponding hardware ring based on scheduling
* policy.
*/
struct amd_sched_entity {
struct list_head list;
struct amd_sched_rq *rq;
struct amd_gpu_scheduler *sched;
spinlock_t queue_lock;
struct kfifo job_queue;
atomic_t fence_seq;
uint64_t fence_context;
struct fence *dependency;
struct fence_cb cb;
};
/**
* 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 amd_sched_rq {
spinlock_t lock;
struct list_head entities;
struct amd_sched_entity *current_entity;
};
struct amd_sched_fence {
struct fence base;
struct fence_cb cb;
struct list_head scheduled_cb;
struct amd_gpu_scheduler *sched;
spinlock_t lock;
void *owner;
struct amd_sched_job *s_job;
};
struct amd_sched_job {
struct kref refcount;
struct amd_gpu_scheduler *sched;
struct amd_sched_entity *s_entity;
struct amd_sched_fence *s_fence;
bool use_sched; /* true if the job goes to scheduler */
struct fence_cb cb_free_job;
struct work_struct work_free_job;
struct list_head node;
struct delayed_work work_tdr;
void (*free_callback)(struct kref *refcount);
};
extern const struct fence_ops amd_sched_fence_ops;
static inline struct amd_sched_fence *to_amd_sched_fence(struct fence *f)
{
struct amd_sched_fence *__f = container_of(f, struct amd_sched_fence,
base);
if (__f->base.ops == &amd_sched_fence_ops)
return __f;
return NULL;
}
/**
* Define the backend operations called by the scheduler,
* these functions should be implemented in driver side
*/
struct amd_sched_backend_ops {
struct fence *(*dependency)(struct amd_sched_job *sched_job);
struct fence *(*run_job)(struct amd_sched_job *sched_job);
};
enum amd_sched_priority {
AMD_SCHED_PRIORITY_KERNEL = 0,
AMD_SCHED_PRIORITY_NORMAL,
AMD_SCHED_MAX_PRIORITY
};
/**
* One scheduler is implemented for each hardware ring
*/
struct amd_gpu_scheduler {
const struct amd_sched_backend_ops *ops;
uint32_t hw_submission_limit;
long timeout;
const char *name;
struct amd_sched_rq sched_rq[AMD_SCHED_MAX_PRIORITY];
wait_queue_head_t wake_up_worker;
wait_queue_head_t job_scheduled;
atomic_t hw_rq_count;
struct task_struct *thread;
struct list_head ring_mirror_list;
spinlock_t job_list_lock;
};
int amd_sched_init(struct amd_gpu_scheduler *sched,
const struct amd_sched_backend_ops *ops,
uint32_t hw_submission, long timeout, const char *name);
void amd_sched_fini(struct amd_gpu_scheduler *sched);
int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
struct amd_sched_entity *entity,
struct amd_sched_rq *rq,
uint32_t jobs);
void amd_sched_entity_fini(struct amd_gpu_scheduler *sched,
struct amd_sched_entity *entity);
void amd_sched_entity_push_job(struct amd_sched_job *sched_job);
struct amd_sched_fence *amd_sched_fence_create(
struct amd_sched_entity *s_entity, void *owner);
void amd_sched_fence_scheduled(struct amd_sched_fence *fence);
void amd_sched_fence_signal(struct amd_sched_fence *fence);
int amd_sched_job_init(struct amd_sched_job *job,
struct amd_gpu_scheduler *sched,
struct amd_sched_entity *entity,
void (*timeout_cb)(struct work_struct *work),
void (*free_cb)(struct kref* refcount),
void *owner, struct fence **fence);
static inline void amd_sched_job_get(struct amd_sched_job *job)
{
if (job)
kref_get(&job->refcount);
}
static inline void amd_sched_job_put(struct amd_sched_job *job)
{
if (job)
kref_put(&job->refcount, job->free_callback);
}
#endif
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