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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_GPU_WAIT_IDLE_TIMEOUT_IN_MS 3000
struct amd_gpu_scheduler;
struct amd_run_queue;
/**
* 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_run_queue *belongto_rq;
struct amd_sched_entity *parent;
};
/**
* 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_run_queue {
struct mutex lock;
atomic_t nr_entity;
struct amd_sched_entity head;
struct amd_sched_entity *current_entity;
/**
* Return 0 means this entity can be scheduled
* Return -1 means this entity cannot be scheduled for reasons,
* i.e, it is the head, or these is no job, etc
*/
int (*check_entity_status)(struct amd_sched_entity *entity);
};
/**
* Context based scheduler entity, there can be multiple entities for
* each context, and one entity per ring
*/
struct amd_context_entity {
struct amd_sched_entity generic_entity;
spinlock_t lock;
/* the virtual_seq is unique per context per ring */
atomic64_t last_queued_v_seq;
atomic64_t last_emitted_v_seq;
/* the job_queue maintains the jobs submitted by clients */
struct kfifo job_queue;
spinlock_t queue_lock;
struct amd_gpu_scheduler *scheduler;
wait_queue_head_t wait_queue;
wait_queue_head_t wait_emit;
bool is_pending;
};
struct amd_sched_job {
struct list_head list;
struct fence_cb cb;
struct amd_gpu_scheduler *sched;
void *job;
};
/**
* Define the backend operations called by the scheduler,
* these functions should be implemented in driver side
*/
struct amd_sched_backend_ops {
int (*prepare_job)(struct amd_gpu_scheduler *sched,
struct amd_context_entity *c_entity,
void *job);
void (*run_job)(struct amd_gpu_scheduler *sched,
struct amd_context_entity *c_entity,
struct amd_sched_job *job);
void (*process_job)(struct amd_gpu_scheduler *sched, void *job);
};
/**
* One scheduler is implemented for each hardware ring
*/
struct amd_gpu_scheduler {
void *device;
struct task_struct *thread;
struct amd_run_queue sched_rq;
struct amd_run_queue kernel_rq;
struct list_head active_hw_rq;
atomic64_t hw_rq_count;
struct amd_sched_backend_ops *ops;
uint32_t ring_id;
uint32_t granularity; /* in ms unit */
uint32_t preemption;
wait_queue_head_t wait_queue;
struct amd_context_entity *current_entity;
struct mutex sched_lock;
spinlock_t queue_lock;
uint32_t hw_submission_limit;
};
struct amd_gpu_scheduler *amd_sched_create(void *device,
struct amd_sched_backend_ops *ops,
uint32_t ring,
uint32_t granularity,
uint32_t preemption,
uint32_t hw_submission);
int amd_sched_destroy(struct amd_gpu_scheduler *sched);
int amd_sched_push_job(struct amd_gpu_scheduler *sched,
struct amd_context_entity *c_entity,
void *job);
int amd_sched_wait_emit(struct amd_context_entity *c_entity,
uint64_t seq,
bool intr,
long timeout);
void amd_sched_process_job(struct amd_sched_job *sched_job);
uint64_t amd_sched_get_handled_seq(struct amd_gpu_scheduler *sched);
int amd_context_entity_fini(struct amd_gpu_scheduler *sched,
struct amd_context_entity *entity);
int amd_context_entity_init(struct amd_gpu_scheduler *sched,
struct amd_context_entity *entity,
struct amd_sched_entity *parent,
struct amd_run_queue *rq,
uint32_t jobs);
void amd_sched_emit(struct amd_context_entity *c_entity, uint64_t seq);
uint64_t amd_sched_next_queued_seq(struct amd_context_entity *c_entity);
#endif
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