2015-05-22 18:55:07 +08:00
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/*
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* Copyright 2015 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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*
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*/
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#include <linux/kthread.h>
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#include <linux/wait.h>
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#include <linux/sched.h>
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#include <drm/drmP.h>
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#include "gpu_scheduler.h"
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/* Initialize a given run queue struct */
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2015-08-12 17:46:04 +08:00
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static void amd_sched_rq_init(struct amd_sched_rq *rq)
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2015-05-22 18:55:07 +08:00
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{
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2015-08-18 20:41:25 +08:00
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spin_lock_init(&rq->lock);
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2015-08-12 17:46:04 +08:00
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INIT_LIST_HEAD(&rq->entities);
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rq->current_entity = NULL;
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2015-05-22 18:55:07 +08:00
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}
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2015-08-12 17:46:04 +08:00
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static void amd_sched_rq_add_entity(struct amd_sched_rq *rq,
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struct amd_sched_entity *entity)
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2015-05-22 18:55:07 +08:00
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{
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2015-08-18 20:41:25 +08:00
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spin_lock(&rq->lock);
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2015-08-12 17:46:04 +08:00
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list_add_tail(&entity->list, &rq->entities);
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2015-08-18 20:41:25 +08:00
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spin_unlock(&rq->lock);
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2015-05-22 18:55:07 +08:00
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}
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2015-08-12 17:46:04 +08:00
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static void amd_sched_rq_remove_entity(struct amd_sched_rq *rq,
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struct amd_sched_entity *entity)
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2015-05-22 18:55:07 +08:00
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{
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2015-08-18 20:41:25 +08:00
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spin_lock(&rq->lock);
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2015-08-12 17:46:04 +08:00
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list_del_init(&entity->list);
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if (rq->current_entity == entity)
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rq->current_entity = NULL;
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2015-08-18 20:41:25 +08:00
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spin_unlock(&rq->lock);
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2015-05-22 18:55:07 +08:00
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}
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/**
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* Select next entity from a specified run queue with round robin policy.
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* It could return the same entity as current one if current is the only
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* available one in the queue. Return NULL if nothing available.
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*/
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2015-08-12 17:46:04 +08:00
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static struct amd_sched_entity *
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amd_sched_rq_select_entity(struct amd_sched_rq *rq)
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2015-05-22 18:55:07 +08:00
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{
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2015-08-18 20:41:25 +08:00
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struct amd_sched_entity *entity;
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2015-08-12 17:46:04 +08:00
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2015-08-18 20:41:25 +08:00
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spin_lock(&rq->lock);
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entity = rq->current_entity;
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2015-08-12 17:46:04 +08:00
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if (entity) {
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list_for_each_entry_continue(entity, &rq->entities, list) {
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if (!kfifo_is_empty(&entity->job_queue)) {
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rq->current_entity = entity;
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2015-08-18 20:41:25 +08:00
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spin_unlock(&rq->lock);
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2015-08-12 17:46:04 +08:00
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return rq->current_entity;
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}
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2015-05-22 18:55:07 +08:00
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}
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}
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2015-08-12 17:46:04 +08:00
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list_for_each_entry(entity, &rq->entities, list) {
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2015-05-22 18:55:07 +08:00
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2015-08-12 17:46:04 +08:00
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if (!kfifo_is_empty(&entity->job_queue)) {
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rq->current_entity = entity;
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2015-08-18 20:41:25 +08:00
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spin_unlock(&rq->lock);
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2015-08-12 17:46:04 +08:00
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return rq->current_entity;
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}
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2015-05-22 18:55:07 +08:00
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2015-08-12 17:46:04 +08:00
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if (entity == rq->current_entity)
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break;
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}
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2015-05-22 18:55:07 +08:00
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2015-08-18 20:41:25 +08:00
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spin_unlock(&rq->lock);
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2015-08-12 17:46:04 +08:00
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return NULL;
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2015-05-22 18:55:07 +08:00
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}
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/**
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2015-08-19 22:12:15 +08:00
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* Return ture if we can push more jobs to the hw.
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*/
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static bool amd_sched_ready(struct amd_gpu_scheduler *sched)
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2015-05-22 18:55:07 +08:00
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{
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2015-08-19 22:12:15 +08:00
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return atomic_read(&sched->hw_rq_count) <
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sched->hw_submission_limit;
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2015-05-22 18:55:07 +08:00
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}
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/**
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* Select next entity containing real IB submissions
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*/
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2015-08-06 00:33:21 +08:00
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static struct amd_sched_entity *
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2015-08-06 00:18:52 +08:00
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select_context(struct amd_gpu_scheduler *sched)
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2015-05-22 18:55:07 +08:00
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{
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2015-08-06 00:33:21 +08:00
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struct amd_sched_entity *wake_entity = NULL;
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struct amd_sched_entity *tmp;
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2015-05-22 18:55:07 +08:00
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2015-08-19 22:12:15 +08:00
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if (!amd_sched_ready(sched))
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2015-05-22 18:55:07 +08:00
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return NULL;
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/* Kernel run queue has higher priority than normal run queue*/
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2015-08-18 20:41:25 +08:00
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tmp = amd_sched_rq_select_entity(&sched->kernel_rq);
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if (tmp == NULL)
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tmp = amd_sched_rq_select_entity(&sched->sched_rq);
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2015-05-22 18:55:07 +08:00
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if (sched->current_entity && (sched->current_entity != tmp))
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wake_entity = sched->current_entity;
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sched->current_entity = tmp;
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2015-08-13 13:04:06 +08:00
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if (wake_entity && wake_entity->need_wakeup)
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2015-05-22 18:55:07 +08:00
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wake_up(&wake_entity->wait_queue);
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return tmp;
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}
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/**
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* Init a context entity used by scheduler when submit to HW ring.
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*
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* @sched The pointer to the scheduler
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2015-08-06 00:33:21 +08:00
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* @entity The pointer to a valid amd_sched_entity
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2015-05-22 18:55:07 +08:00
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* @rq The run queue this entity belongs
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2015-08-04 22:58:36 +08:00
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* @kernel If this is an entity for the kernel
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2015-07-30 16:36:58 +08:00
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* @jobs The max number of jobs in the job queue
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2015-05-22 18:55:07 +08:00
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*
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* return 0 if succeed. negative error code on failure
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*/
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2015-08-06 00:33:21 +08:00
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int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
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2015-08-06 03:22:10 +08:00
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struct amd_sched_entity *entity,
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2015-08-12 17:46:04 +08:00
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struct amd_sched_rq *rq,
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2015-08-06 03:22:10 +08:00
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uint32_t jobs)
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2015-05-22 18:55:07 +08:00
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{
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2015-08-02 11:18:04 +08:00
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char name[20];
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2015-05-22 18:55:07 +08:00
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if (!(sched && entity && rq))
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return -EINVAL;
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2015-08-06 00:33:21 +08:00
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memset(entity, 0, sizeof(struct amd_sched_entity));
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entity->belongto_rq = rq;
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2015-05-22 18:55:07 +08:00
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entity->scheduler = sched;
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init_waitqueue_head(&entity->wait_queue);
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2015-08-02 11:18:04 +08:00
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entity->fence_context = fence_context_alloc(1);
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snprintf(name, sizeof(name), "c_entity[%llu]", entity->fence_context);
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memcpy(entity->name, name, 20);
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2015-08-13 13:04:06 +08:00
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entity->need_wakeup = false;
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2015-05-22 18:55:07 +08:00
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if(kfifo_alloc(&entity->job_queue,
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2015-07-30 16:36:58 +08:00
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jobs * sizeof(void *),
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2015-05-22 18:55:07 +08:00
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GFP_KERNEL))
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return -EINVAL;
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spin_lock_init(&entity->queue_lock);
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2015-08-19 21:00:55 +08:00
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atomic_set(&entity->fence_seq, 0);
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2015-05-22 18:55:07 +08:00
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/* Add the entity to the run queue */
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2015-08-12 17:46:04 +08:00
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amd_sched_rq_add_entity(rq, entity);
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2015-05-22 18:55:07 +08:00
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return 0;
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}
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/**
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* Query if entity is initialized
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*
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* @sched Pointer to scheduler instance
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* @entity The pointer to a valid scheduler entity
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*
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* return true if entity is initialized, false otherwise
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*/
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static bool is_context_entity_initialized(struct amd_gpu_scheduler *sched,
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2015-08-06 00:33:21 +08:00
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struct amd_sched_entity *entity)
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2015-05-22 18:55:07 +08:00
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{
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return entity->scheduler == sched &&
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2015-08-06 00:33:21 +08:00
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entity->belongto_rq != NULL;
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2015-05-22 18:55:07 +08:00
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}
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static bool is_context_entity_idle(struct amd_gpu_scheduler *sched,
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2015-08-06 00:33:21 +08:00
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struct amd_sched_entity *entity)
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2015-05-22 18:55:07 +08:00
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{
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/**
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* Idle means no pending IBs, and the entity is not
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* currently being used.
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*/
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barrier();
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if ((sched->current_entity != entity) &&
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kfifo_is_empty(&entity->job_queue))
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return true;
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return false;
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}
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/**
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* Destroy a context entity
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*
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* @sched Pointer to scheduler instance
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* @entity The pointer to a valid scheduler entity
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*
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* return 0 if succeed. negative error code on failure
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*/
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2015-08-06 00:33:21 +08:00
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int amd_sched_entity_fini(struct amd_gpu_scheduler *sched,
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struct amd_sched_entity *entity)
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2015-05-22 18:55:07 +08:00
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{
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int r = 0;
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2015-08-12 17:46:04 +08:00
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struct amd_sched_rq *rq = entity->belongto_rq;
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2015-05-22 18:55:07 +08:00
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if (!is_context_entity_initialized(sched, entity))
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return 0;
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2015-08-13 13:04:06 +08:00
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entity->need_wakeup = true;
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2015-05-22 18:55:07 +08:00
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/**
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* The client will not queue more IBs during this fini, consume existing
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* queued IBs
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*/
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r = wait_event_timeout(
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entity->wait_queue,
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is_context_entity_idle(sched, entity),
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msecs_to_jiffies(AMD_GPU_WAIT_IDLE_TIMEOUT_IN_MS)
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) ? 0 : -1;
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2015-08-19 23:34:20 +08:00
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if (r)
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DRM_INFO("Entity %p is in waiting state during fini\n",
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entity);
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2015-05-22 18:55:07 +08:00
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2015-08-12 17:46:04 +08:00
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amd_sched_rq_remove_entity(rq, entity);
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2015-05-22 18:55:07 +08:00
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kfifo_free(&entity->job_queue);
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return r;
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}
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/**
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* Submit a normal job to the job queue
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*
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* @sched The pointer to the scheduler
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2015-08-06 00:33:21 +08:00
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* @c_entity The pointer to amd_sched_entity
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2015-05-22 18:55:07 +08:00
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* @job The pointer to job required to submit
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2015-08-05 19:07:08 +08:00
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* return 0 if succeed. -1 if failed.
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* -2 indicate queue is full for this client, client should wait untill
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* scheduler consum some queued command.
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* -1 other fail.
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2015-05-22 18:55:07 +08:00
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*/
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2015-08-18 15:16:40 +08:00
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int amd_sched_push_job(struct amd_sched_job *sched_job)
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2015-05-22 18:55:07 +08:00
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{
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2015-08-18 15:16:40 +08:00
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struct amd_sched_fence *fence =
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amd_sched_fence_create(sched_job->s_entity);
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2015-08-02 11:18:04 +08:00
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if (!fence)
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return -EINVAL;
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2015-08-18 15:16:40 +08:00
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fence_get(&fence->base);
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sched_job->s_fence = fence;
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while (kfifo_in_spinlocked(&sched_job->s_entity->job_queue,
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&sched_job, sizeof(void *),
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&sched_job->s_entity->queue_lock) !=
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sizeof(void *)) {
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2015-05-22 18:55:07 +08:00
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/**
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* Current context used up all its IB slots
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* wait here, or need to check whether GPU is hung
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*/
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schedule();
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}
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2015-08-13 13:04:06 +08:00
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/* first job wake up scheduler */
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2015-08-18 15:16:40 +08:00
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if ((kfifo_len(&sched_job->s_entity->job_queue) / sizeof(void *)) == 1)
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wake_up_interruptible(&sched_job->sched->wait_queue);
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2015-08-05 19:07:08 +08:00
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return 0;
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2015-05-22 18:55:07 +08:00
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}
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2015-08-06 03:22:10 +08:00
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static void amd_sched_process_job(struct fence *f, struct fence_cb *cb)
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{
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struct amd_sched_job *sched_job =
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container_of(cb, struct amd_sched_job, cb);
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struct amd_gpu_scheduler *sched;
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sched = sched_job->sched;
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2015-08-02 11:18:04 +08:00
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amd_sched_fence_signal(sched_job->s_fence);
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2015-08-19 22:12:15 +08:00
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atomic_dec(&sched->hw_rq_count);
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2015-08-02 11:18:04 +08:00
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fence_put(&sched_job->s_fence->base);
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2015-08-18 15:16:40 +08:00
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sched->ops->process_job(sched, sched_job);
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2015-08-06 03:22:10 +08:00
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wake_up_interruptible(&sched->wait_queue);
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}
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2015-05-22 18:55:07 +08:00
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static int amd_sched_main(void *param)
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{
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int r;
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2015-08-06 15:19:12 +08:00
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struct amd_sched_job *job;
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2015-05-22 18:55:07 +08:00
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struct sched_param sparam = {.sched_priority = 1};
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2015-08-06 00:33:21 +08:00
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struct amd_sched_entity *c_entity = NULL;
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2015-05-22 18:55:07 +08:00
|
|
|
struct amd_gpu_scheduler *sched = (struct amd_gpu_scheduler *)param;
|
|
|
|
|
|
|
|
sched_setscheduler(current, SCHED_FIFO, &sparam);
|
|
|
|
|
|
|
|
while (!kthread_should_stop()) {
|
2015-08-06 03:22:10 +08:00
|
|
|
struct fence *fence;
|
|
|
|
|
2015-05-22 18:55:07 +08:00
|
|
|
wait_event_interruptible(sched->wait_queue,
|
2015-08-19 22:12:15 +08:00
|
|
|
amd_sched_ready(sched) &&
|
2015-05-22 18:55:07 +08:00
|
|
|
(c_entity = select_context(sched)));
|
|
|
|
r = kfifo_out(&c_entity->job_queue, &job, sizeof(void *));
|
|
|
|
if (r != sizeof(void *))
|
|
|
|
continue;
|
2015-08-18 15:16:40 +08:00
|
|
|
r = 0;
|
|
|
|
if (sched->ops->prepare_job)
|
|
|
|
r = sched->ops->prepare_job(sched, c_entity, job);
|
2015-08-05 19:52:14 +08:00
|
|
|
if (!r) {
|
2015-08-19 22:12:15 +08:00
|
|
|
atomic_inc(&sched->hw_rq_count);
|
2015-08-05 19:52:14 +08:00
|
|
|
}
|
2015-05-22 18:55:07 +08:00
|
|
|
mutex_lock(&sched->sched_lock);
|
2015-08-06 15:19:12 +08:00
|
|
|
fence = sched->ops->run_job(sched, c_entity, job);
|
2015-08-06 03:22:10 +08:00
|
|
|
if (fence) {
|
2015-08-06 15:19:12 +08:00
|
|
|
r = fence_add_callback(fence, &job->cb,
|
2015-08-06 03:22:10 +08:00
|
|
|
amd_sched_process_job);
|
|
|
|
if (r == -ENOENT)
|
2015-08-06 15:19:12 +08:00
|
|
|
amd_sched_process_job(fence, &job->cb);
|
2015-08-06 03:22:10 +08:00
|
|
|
else if (r)
|
|
|
|
DRM_ERROR("fence add callback failed (%d)\n", r);
|
|
|
|
fence_put(fence);
|
|
|
|
}
|
2015-05-22 18:55:07 +08:00
|
|
|
mutex_unlock(&sched->sched_lock);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Create a gpu scheduler
|
|
|
|
*
|
|
|
|
* @device The device context for this scheduler
|
|
|
|
* @ops The backend operations for this scheduler.
|
|
|
|
* @id The scheduler is per ring, here is ring id.
|
|
|
|
* @granularity The minumum ms unit the scheduler will scheduled.
|
|
|
|
* @preemption Indicate whether this ring support preemption, 0 is no.
|
|
|
|
*
|
|
|
|
* return the pointer to scheduler for success, otherwise return NULL
|
|
|
|
*/
|
|
|
|
struct amd_gpu_scheduler *amd_sched_create(void *device,
|
|
|
|
struct amd_sched_backend_ops *ops,
|
|
|
|
unsigned ring,
|
|
|
|
unsigned granularity,
|
2015-07-30 16:44:05 +08:00
|
|
|
unsigned preemption,
|
|
|
|
unsigned hw_submission)
|
2015-05-22 18:55:07 +08:00
|
|
|
{
|
|
|
|
struct amd_gpu_scheduler *sched;
|
2015-08-06 00:18:52 +08:00
|
|
|
char name[20];
|
2015-05-22 18:55:07 +08:00
|
|
|
|
|
|
|
sched = kzalloc(sizeof(struct amd_gpu_scheduler), GFP_KERNEL);
|
|
|
|
if (!sched)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
sched->device = device;
|
|
|
|
sched->ops = ops;
|
|
|
|
sched->granularity = granularity;
|
|
|
|
sched->ring_id = ring;
|
|
|
|
sched->preemption = preemption;
|
2015-08-05 19:52:14 +08:00
|
|
|
sched->hw_submission_limit = hw_submission;
|
2015-05-22 18:55:07 +08:00
|
|
|
snprintf(name, sizeof(name), "gpu_sched[%d]", ring);
|
|
|
|
mutex_init(&sched->sched_lock);
|
2015-08-12 17:46:04 +08:00
|
|
|
amd_sched_rq_init(&sched->sched_rq);
|
|
|
|
amd_sched_rq_init(&sched->kernel_rq);
|
2015-05-22 18:55:07 +08:00
|
|
|
|
|
|
|
init_waitqueue_head(&sched->wait_queue);
|
2015-08-19 22:12:15 +08:00
|
|
|
atomic_set(&sched->hw_rq_count, 0);
|
2015-05-22 18:55:07 +08:00
|
|
|
/* Each scheduler will run on a seperate kernel thread */
|
|
|
|
sched->thread = kthread_create(amd_sched_main, sched, name);
|
|
|
|
if (sched->thread) {
|
|
|
|
wake_up_process(sched->thread);
|
|
|
|
return sched;
|
|
|
|
}
|
|
|
|
|
|
|
|
DRM_ERROR("Failed to create scheduler for id %d.\n", ring);
|
|
|
|
kfree(sched);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Destroy a gpu scheduler
|
|
|
|
*
|
|
|
|
* @sched The pointer to the scheduler
|
|
|
|
*
|
|
|
|
* return 0 if succeed. -1 if failed.
|
|
|
|
*/
|
|
|
|
int amd_sched_destroy(struct amd_gpu_scheduler *sched)
|
|
|
|
{
|
|
|
|
kthread_stop(sched->thread);
|
|
|
|
kfree(sched);
|
|
|
|
return 0;
|
|
|
|
}
|