forked from Minki/linux
8623b5255a
We are racing to initialize sched->thread here, just always check the current thread. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com> Reviewed-by: Kent Russell <kent.russell@amd.com> Link: https://patchwork.freedesktop.org/patch/361303/
895 lines
23 KiB
C
895 lines
23 KiB
C
/*
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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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* DOC: Overview
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*
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* The GPU scheduler provides entities which allow userspace to push jobs
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* into software queues which are then scheduled on a hardware run queue.
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* The software queues have a priority among them. The scheduler selects the entities
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* from the run queue using a FIFO. The scheduler provides dependency handling
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* features among jobs. The driver is supposed to provide callback functions for
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* backend operations to the scheduler like submitting a job to hardware run queue,
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* returning the dependencies of a job etc.
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*
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* The organisation of the scheduler is the following:
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*
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* 1. Each hw run queue has one scheduler
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* 2. Each scheduler has multiple run queues with different priorities
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* (e.g., HIGH_HW,HIGH_SW, KERNEL, NORMAL)
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* 3. Each scheduler run queue has a queue of entities to schedule
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* 4. Entities themselves maintain a queue of jobs that will be scheduled on
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* the hardware.
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*
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* The jobs in a entity are always scheduled in the order that they were pushed.
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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 <linux/completion.h>
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#include <uapi/linux/sched/types.h>
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#include <drm/drm_print.h>
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#include <drm/gpu_scheduler.h>
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#include <drm/spsc_queue.h>
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#define CREATE_TRACE_POINTS
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#include "gpu_scheduler_trace.h"
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#define to_drm_sched_job(sched_job) \
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container_of((sched_job), struct drm_sched_job, queue_node)
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static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb);
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/**
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* drm_sched_rq_init - initialize a given run queue struct
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*
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* @rq: scheduler run queue
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*
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* Initializes a scheduler runqueue.
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*/
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static void drm_sched_rq_init(struct drm_gpu_scheduler *sched,
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struct drm_sched_rq *rq)
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{
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spin_lock_init(&rq->lock);
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INIT_LIST_HEAD(&rq->entities);
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rq->current_entity = NULL;
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rq->sched = sched;
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}
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/**
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* drm_sched_rq_add_entity - add an entity
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*
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* @rq: scheduler run queue
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* @entity: scheduler entity
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*
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* Adds a scheduler entity to the run queue.
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*/
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void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
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struct drm_sched_entity *entity)
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{
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if (!list_empty(&entity->list))
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return;
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spin_lock(&rq->lock);
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list_add_tail(&entity->list, &rq->entities);
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spin_unlock(&rq->lock);
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}
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/**
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* drm_sched_rq_remove_entity - remove an entity
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*
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* @rq: scheduler run queue
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* @entity: scheduler entity
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*
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* Removes a scheduler entity from the run queue.
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*/
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void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
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struct drm_sched_entity *entity)
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{
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if (list_empty(&entity->list))
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return;
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spin_lock(&rq->lock);
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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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spin_unlock(&rq->lock);
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}
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/**
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* drm_sched_rq_select_entity - Select an entity which could provide a job to run
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*
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* @rq: scheduler run queue to check.
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*
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* Try to find a ready entity, returns NULL if none found.
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*/
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static struct drm_sched_entity *
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drm_sched_rq_select_entity(struct drm_sched_rq *rq)
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{
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struct drm_sched_entity *entity;
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spin_lock(&rq->lock);
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entity = rq->current_entity;
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if (entity) {
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list_for_each_entry_continue(entity, &rq->entities, list) {
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if (drm_sched_entity_is_ready(entity)) {
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rq->current_entity = entity;
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reinit_completion(&entity->entity_idle);
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spin_unlock(&rq->lock);
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return entity;
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}
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}
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}
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list_for_each_entry(entity, &rq->entities, list) {
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if (drm_sched_entity_is_ready(entity)) {
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rq->current_entity = entity;
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reinit_completion(&entity->entity_idle);
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spin_unlock(&rq->lock);
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return entity;
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}
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if (entity == rq->current_entity)
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break;
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}
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spin_unlock(&rq->lock);
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return NULL;
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}
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/**
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* drm_sched_dependency_optimized
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*
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* @fence: the dependency fence
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* @entity: the entity which depends on the above fence
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*
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* Returns true if the dependency can be optimized and false otherwise
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*/
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bool drm_sched_dependency_optimized(struct dma_fence* fence,
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struct drm_sched_entity *entity)
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{
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struct drm_gpu_scheduler *sched = entity->rq->sched;
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struct drm_sched_fence *s_fence;
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if (!fence || dma_fence_is_signaled(fence))
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return false;
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if (fence->context == entity->fence_context)
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return true;
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s_fence = to_drm_sched_fence(fence);
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if (s_fence && s_fence->sched == sched)
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return true;
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return false;
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}
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EXPORT_SYMBOL(drm_sched_dependency_optimized);
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/**
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* drm_sched_start_timeout - start timeout for reset worker
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*
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* @sched: scheduler instance to start the worker for
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*
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* Start the timeout for the given scheduler.
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*/
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static void drm_sched_start_timeout(struct drm_gpu_scheduler *sched)
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{
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if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
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!list_empty(&sched->ring_mirror_list))
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schedule_delayed_work(&sched->work_tdr, sched->timeout);
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}
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/**
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* drm_sched_fault - immediately start timeout handler
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*
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* @sched: scheduler where the timeout handling should be started.
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*
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* Start timeout handling immediately when the driver detects a hardware fault.
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*/
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void drm_sched_fault(struct drm_gpu_scheduler *sched)
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{
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mod_delayed_work(system_wq, &sched->work_tdr, 0);
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}
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EXPORT_SYMBOL(drm_sched_fault);
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/**
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* drm_sched_suspend_timeout - Suspend scheduler job timeout
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*
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* @sched: scheduler instance for which to suspend the timeout
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*
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* Suspend the delayed work timeout for the scheduler. This is done by
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* modifying the delayed work timeout to an arbitrary large value,
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* MAX_SCHEDULE_TIMEOUT in this case.
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*
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* Returns the timeout remaining
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*
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*/
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unsigned long drm_sched_suspend_timeout(struct drm_gpu_scheduler *sched)
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{
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unsigned long sched_timeout, now = jiffies;
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sched_timeout = sched->work_tdr.timer.expires;
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/*
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* Modify the timeout to an arbitrarily large value. This also prevents
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* the timeout to be restarted when new submissions arrive
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*/
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if (mod_delayed_work(system_wq, &sched->work_tdr, MAX_SCHEDULE_TIMEOUT)
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&& time_after(sched_timeout, now))
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return sched_timeout - now;
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else
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return sched->timeout;
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}
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EXPORT_SYMBOL(drm_sched_suspend_timeout);
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/**
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* drm_sched_resume_timeout - Resume scheduler job timeout
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*
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* @sched: scheduler instance for which to resume the timeout
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* @remaining: remaining timeout
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*
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* Resume the delayed work timeout for the scheduler.
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*/
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void drm_sched_resume_timeout(struct drm_gpu_scheduler *sched,
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unsigned long remaining)
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{
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spin_lock(&sched->job_list_lock);
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if (list_empty(&sched->ring_mirror_list))
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cancel_delayed_work(&sched->work_tdr);
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else
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mod_delayed_work(system_wq, &sched->work_tdr, remaining);
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spin_unlock(&sched->job_list_lock);
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}
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EXPORT_SYMBOL(drm_sched_resume_timeout);
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static void drm_sched_job_begin(struct drm_sched_job *s_job)
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{
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struct drm_gpu_scheduler *sched = s_job->sched;
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spin_lock(&sched->job_list_lock);
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list_add_tail(&s_job->node, &sched->ring_mirror_list);
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drm_sched_start_timeout(sched);
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spin_unlock(&sched->job_list_lock);
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}
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static void drm_sched_job_timedout(struct work_struct *work)
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{
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struct drm_gpu_scheduler *sched;
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struct drm_sched_job *job;
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sched = container_of(work, struct drm_gpu_scheduler, work_tdr.work);
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/* Protects against concurrent deletion in drm_sched_get_cleanup_job */
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spin_lock(&sched->job_list_lock);
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job = list_first_entry_or_null(&sched->ring_mirror_list,
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struct drm_sched_job, node);
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if (job) {
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/*
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* Remove the bad job so it cannot be freed by concurrent
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* drm_sched_cleanup_jobs. It will be reinserted back after sched->thread
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* is parked at which point it's safe.
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*/
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list_del_init(&job->node);
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spin_unlock(&sched->job_list_lock);
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job->sched->ops->timedout_job(job);
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/*
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* Guilty job did complete and hence needs to be manually removed
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* See drm_sched_stop doc.
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*/
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if (sched->free_guilty) {
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job->sched->ops->free_job(job);
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sched->free_guilty = false;
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}
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} else {
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spin_unlock(&sched->job_list_lock);
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}
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spin_lock(&sched->job_list_lock);
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drm_sched_start_timeout(sched);
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spin_unlock(&sched->job_list_lock);
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}
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/**
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* drm_sched_increase_karma - Update sched_entity guilty flag
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*
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* @bad: The job guilty of time out
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*
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* Increment on every hang caused by the 'bad' job. If this exceeds the hang
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* limit of the scheduler then the respective sched entity is marked guilty and
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* jobs from it will not be scheduled further
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*/
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void drm_sched_increase_karma(struct drm_sched_job *bad)
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{
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int i;
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struct drm_sched_entity *tmp;
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struct drm_sched_entity *entity;
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struct drm_gpu_scheduler *sched = bad->sched;
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/* don't increase @bad's karma if it's from KERNEL RQ,
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* because sometimes GPU hang would cause kernel jobs (like VM updating jobs)
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* corrupt but keep in mind that kernel jobs always considered good.
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*/
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if (bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
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atomic_inc(&bad->karma);
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for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_KERNEL;
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i++) {
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struct drm_sched_rq *rq = &sched->sched_rq[i];
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spin_lock(&rq->lock);
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list_for_each_entry_safe(entity, tmp, &rq->entities, list) {
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if (bad->s_fence->scheduled.context ==
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entity->fence_context) {
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if (atomic_read(&bad->karma) >
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bad->sched->hang_limit)
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if (entity->guilty)
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atomic_set(entity->guilty, 1);
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break;
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}
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}
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spin_unlock(&rq->lock);
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if (&entity->list != &rq->entities)
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break;
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}
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}
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}
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EXPORT_SYMBOL(drm_sched_increase_karma);
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/**
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* drm_sched_stop - stop the scheduler
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*
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* @sched: scheduler instance
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* @bad: job which caused the time out
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*
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* Stop the scheduler and also removes and frees all completed jobs.
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* Note: bad job will not be freed as it might be used later and so it's
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* callers responsibility to release it manually if it's not part of the
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* mirror list any more.
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*
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*/
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void drm_sched_stop(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
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{
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struct drm_sched_job *s_job, *tmp;
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kthread_park(sched->thread);
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/*
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* Reinsert back the bad job here - now it's safe as
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* drm_sched_get_cleanup_job cannot race against us and release the
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* bad job at this point - we parked (waited for) any in progress
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* (earlier) cleanups and drm_sched_get_cleanup_job will not be called
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* now until the scheduler thread is unparked.
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*/
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if (bad && bad->sched == sched)
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/*
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* Add at the head of the queue to reflect it was the earliest
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* job extracted.
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*/
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list_add(&bad->node, &sched->ring_mirror_list);
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/*
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* Iterate the job list from later to earlier one and either deactive
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* their HW callbacks or remove them from mirror list if they already
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* signaled.
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* This iteration is thread safe as sched thread is stopped.
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*/
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list_for_each_entry_safe_reverse(s_job, tmp, &sched->ring_mirror_list, node) {
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if (s_job->s_fence->parent &&
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dma_fence_remove_callback(s_job->s_fence->parent,
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&s_job->cb)) {
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atomic_dec(&sched->hw_rq_count);
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} else {
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/*
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* remove job from ring_mirror_list.
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* Locking here is for concurrent resume timeout
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*/
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spin_lock(&sched->job_list_lock);
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list_del_init(&s_job->node);
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spin_unlock(&sched->job_list_lock);
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/*
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* Wait for job's HW fence callback to finish using s_job
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* before releasing it.
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*
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* Job is still alive so fence refcount at least 1
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*/
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dma_fence_wait(&s_job->s_fence->finished, false);
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/*
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* We must keep bad job alive for later use during
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* recovery by some of the drivers but leave a hint
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* that the guilty job must be released.
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*/
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if (bad != s_job)
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sched->ops->free_job(s_job);
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else
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sched->free_guilty = true;
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}
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}
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/*
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* Stop pending timer in flight as we rearm it in drm_sched_start. This
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* avoids the pending timeout work in progress to fire right away after
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* this TDR finished and before the newly restarted jobs had a
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* chance to complete.
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*/
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cancel_delayed_work(&sched->work_tdr);
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}
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EXPORT_SYMBOL(drm_sched_stop);
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/**
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* drm_sched_job_recovery - recover jobs after a reset
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*
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* @sched: scheduler instance
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* @full_recovery: proceed with complete sched restart
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*
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*/
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void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery)
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{
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struct drm_sched_job *s_job, *tmp;
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int r;
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/*
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* Locking the list is not required here as the sched thread is parked
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* so no new jobs are being inserted or removed. Also concurrent
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* GPU recovers can't run in parallel.
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*/
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list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list, node) {
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struct dma_fence *fence = s_job->s_fence->parent;
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atomic_inc(&sched->hw_rq_count);
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if (!full_recovery)
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continue;
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if (fence) {
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r = dma_fence_add_callback(fence, &s_job->cb,
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drm_sched_process_job);
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if (r == -ENOENT)
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drm_sched_process_job(fence, &s_job->cb);
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else if (r)
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DRM_ERROR("fence add callback failed (%d)\n",
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r);
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} else
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drm_sched_process_job(NULL, &s_job->cb);
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}
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if (full_recovery) {
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spin_lock(&sched->job_list_lock);
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drm_sched_start_timeout(sched);
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spin_unlock(&sched->job_list_lock);
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}
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kthread_unpark(sched->thread);
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}
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EXPORT_SYMBOL(drm_sched_start);
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/**
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* drm_sched_resubmit_jobs - helper to relunch job from mirror ring list
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*
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* @sched: scheduler instance
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*
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*/
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void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched)
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{
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struct drm_sched_job *s_job, *tmp;
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uint64_t guilty_context;
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bool found_guilty = false;
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struct dma_fence *fence;
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list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list, node) {
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struct drm_sched_fence *s_fence = s_job->s_fence;
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if (!found_guilty && atomic_read(&s_job->karma) > sched->hang_limit) {
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found_guilty = true;
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guilty_context = s_job->s_fence->scheduled.context;
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}
|
|
|
|
if (found_guilty && s_job->s_fence->scheduled.context == guilty_context)
|
|
dma_fence_set_error(&s_fence->finished, -ECANCELED);
|
|
|
|
dma_fence_put(s_job->s_fence->parent);
|
|
fence = sched->ops->run_job(s_job);
|
|
|
|
if (IS_ERR_OR_NULL(fence)) {
|
|
if (IS_ERR(fence))
|
|
dma_fence_set_error(&s_fence->finished, PTR_ERR(fence));
|
|
|
|
s_job->s_fence->parent = NULL;
|
|
} else {
|
|
s_job->s_fence->parent = fence;
|
|
}
|
|
|
|
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(drm_sched_resubmit_jobs);
|
|
|
|
/**
|
|
* drm_sched_job_init - init a scheduler job
|
|
*
|
|
* @job: scheduler job to init
|
|
* @entity: scheduler entity to use
|
|
* @owner: job owner for debugging
|
|
*
|
|
* Refer to drm_sched_entity_push_job() documentation
|
|
* for locking considerations.
|
|
*
|
|
* Returns 0 for success, negative error code otherwise.
|
|
*/
|
|
int drm_sched_job_init(struct drm_sched_job *job,
|
|
struct drm_sched_entity *entity,
|
|
void *owner)
|
|
{
|
|
struct drm_gpu_scheduler *sched;
|
|
|
|
drm_sched_entity_select_rq(entity);
|
|
if (!entity->rq)
|
|
return -ENOENT;
|
|
|
|
sched = entity->rq->sched;
|
|
|
|
job->sched = sched;
|
|
job->entity = entity;
|
|
job->s_priority = entity->rq - sched->sched_rq;
|
|
job->s_fence = drm_sched_fence_create(entity, owner);
|
|
if (!job->s_fence)
|
|
return -ENOMEM;
|
|
job->id = atomic64_inc_return(&sched->job_id_count);
|
|
|
|
INIT_LIST_HEAD(&job->node);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_sched_job_init);
|
|
|
|
/**
|
|
* drm_sched_job_cleanup - clean up scheduler job resources
|
|
*
|
|
* @job: scheduler job to clean up
|
|
*/
|
|
void drm_sched_job_cleanup(struct drm_sched_job *job)
|
|
{
|
|
dma_fence_put(&job->s_fence->finished);
|
|
job->s_fence = NULL;
|
|
}
|
|
EXPORT_SYMBOL(drm_sched_job_cleanup);
|
|
|
|
/**
|
|
* drm_sched_ready - is the scheduler ready
|
|
*
|
|
* @sched: scheduler instance
|
|
*
|
|
* Return true if we can push more jobs to the hw, otherwise false.
|
|
*/
|
|
static bool drm_sched_ready(struct drm_gpu_scheduler *sched)
|
|
{
|
|
return atomic_read(&sched->hw_rq_count) <
|
|
sched->hw_submission_limit;
|
|
}
|
|
|
|
/**
|
|
* drm_sched_wakeup - Wake up the scheduler when it is ready
|
|
*
|
|
* @sched: scheduler instance
|
|
*
|
|
*/
|
|
void drm_sched_wakeup(struct drm_gpu_scheduler *sched)
|
|
{
|
|
if (drm_sched_ready(sched))
|
|
wake_up_interruptible(&sched->wake_up_worker);
|
|
}
|
|
|
|
/**
|
|
* drm_sched_select_entity - Select next entity to process
|
|
*
|
|
* @sched: scheduler instance
|
|
*
|
|
* Returns the entity to process or NULL if none are found.
|
|
*/
|
|
static struct drm_sched_entity *
|
|
drm_sched_select_entity(struct drm_gpu_scheduler *sched)
|
|
{
|
|
struct drm_sched_entity *entity;
|
|
int i;
|
|
|
|
if (!drm_sched_ready(sched))
|
|
return NULL;
|
|
|
|
/* Kernel run queue has higher priority than normal run queue*/
|
|
for (i = DRM_SCHED_PRIORITY_MAX - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
|
|
entity = drm_sched_rq_select_entity(&sched->sched_rq[i]);
|
|
if (entity)
|
|
break;
|
|
}
|
|
|
|
return entity;
|
|
}
|
|
|
|
/**
|
|
* drm_sched_process_job - process a job
|
|
*
|
|
* @f: fence
|
|
* @cb: fence callbacks
|
|
*
|
|
* Called after job has finished execution.
|
|
*/
|
|
static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb)
|
|
{
|
|
struct drm_sched_job *s_job = container_of(cb, struct drm_sched_job, cb);
|
|
struct drm_sched_fence *s_fence = s_job->s_fence;
|
|
struct drm_gpu_scheduler *sched = s_fence->sched;
|
|
|
|
atomic_dec(&sched->hw_rq_count);
|
|
atomic_dec(&sched->num_jobs);
|
|
|
|
trace_drm_sched_process_job(s_fence);
|
|
|
|
dma_fence_get(&s_fence->finished);
|
|
drm_sched_fence_finished(s_fence);
|
|
dma_fence_put(&s_fence->finished);
|
|
wake_up_interruptible(&sched->wake_up_worker);
|
|
}
|
|
|
|
/**
|
|
* drm_sched_get_cleanup_job - fetch the next finished job to be destroyed
|
|
*
|
|
* @sched: scheduler instance
|
|
*
|
|
* Returns the next finished job from the mirror list (if there is one)
|
|
* ready for it to be destroyed.
|
|
*/
|
|
static struct drm_sched_job *
|
|
drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
|
|
{
|
|
struct drm_sched_job *job;
|
|
|
|
/*
|
|
* Don't destroy jobs while the timeout worker is running OR thread
|
|
* is being parked and hence assumed to not touch ring_mirror_list
|
|
*/
|
|
if ((sched->timeout != MAX_SCHEDULE_TIMEOUT &&
|
|
!cancel_delayed_work(&sched->work_tdr)) ||
|
|
kthread_should_park())
|
|
return NULL;
|
|
|
|
spin_lock(&sched->job_list_lock);
|
|
|
|
job = list_first_entry_or_null(&sched->ring_mirror_list,
|
|
struct drm_sched_job, node);
|
|
|
|
if (job && dma_fence_is_signaled(&job->s_fence->finished)) {
|
|
/* remove job from ring_mirror_list */
|
|
list_del_init(&job->node);
|
|
} else {
|
|
job = NULL;
|
|
/* queue timeout for next job */
|
|
drm_sched_start_timeout(sched);
|
|
}
|
|
|
|
spin_unlock(&sched->job_list_lock);
|
|
|
|
return job;
|
|
}
|
|
|
|
/**
|
|
* drm_sched_pick_best - Get a drm sched from a sched_list with the least load
|
|
* @sched_list: list of drm_gpu_schedulers
|
|
* @num_sched_list: number of drm_gpu_schedulers in the sched_list
|
|
*
|
|
* Returns pointer of the sched with the least load or NULL if none of the
|
|
* drm_gpu_schedulers are ready
|
|
*/
|
|
struct drm_gpu_scheduler *
|
|
drm_sched_pick_best(struct drm_gpu_scheduler **sched_list,
|
|
unsigned int num_sched_list)
|
|
{
|
|
struct drm_gpu_scheduler *sched, *picked_sched = NULL;
|
|
int i;
|
|
unsigned int min_jobs = UINT_MAX, num_jobs;
|
|
|
|
for (i = 0; i < num_sched_list; ++i) {
|
|
sched = sched_list[i];
|
|
|
|
if (!sched->ready) {
|
|
DRM_WARN("scheduler %s is not ready, skipping",
|
|
sched->name);
|
|
continue;
|
|
}
|
|
|
|
num_jobs = atomic_read(&sched->num_jobs);
|
|
if (num_jobs < min_jobs) {
|
|
min_jobs = num_jobs;
|
|
picked_sched = sched;
|
|
}
|
|
}
|
|
|
|
return picked_sched;
|
|
}
|
|
EXPORT_SYMBOL(drm_sched_pick_best);
|
|
|
|
/**
|
|
* drm_sched_blocked - check if the scheduler is blocked
|
|
*
|
|
* @sched: scheduler instance
|
|
*
|
|
* Returns true if blocked, otherwise false.
|
|
*/
|
|
static bool drm_sched_blocked(struct drm_gpu_scheduler *sched)
|
|
{
|
|
if (kthread_should_park()) {
|
|
kthread_parkme();
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* drm_sched_main - main scheduler thread
|
|
*
|
|
* @param: scheduler instance
|
|
*
|
|
* Returns 0.
|
|
*/
|
|
static int drm_sched_main(void *param)
|
|
{
|
|
struct sched_param sparam = {.sched_priority = 1};
|
|
struct drm_gpu_scheduler *sched = (struct drm_gpu_scheduler *)param;
|
|
int r;
|
|
|
|
sched_setscheduler(current, SCHED_FIFO, &sparam);
|
|
|
|
while (!kthread_should_stop()) {
|
|
struct drm_sched_entity *entity = NULL;
|
|
struct drm_sched_fence *s_fence;
|
|
struct drm_sched_job *sched_job;
|
|
struct dma_fence *fence;
|
|
struct drm_sched_job *cleanup_job = NULL;
|
|
|
|
wait_event_interruptible(sched->wake_up_worker,
|
|
(cleanup_job = drm_sched_get_cleanup_job(sched)) ||
|
|
(!drm_sched_blocked(sched) &&
|
|
(entity = drm_sched_select_entity(sched))) ||
|
|
kthread_should_stop());
|
|
|
|
if (cleanup_job) {
|
|
sched->ops->free_job(cleanup_job);
|
|
/* queue timeout for next job */
|
|
drm_sched_start_timeout(sched);
|
|
}
|
|
|
|
if (!entity)
|
|
continue;
|
|
|
|
sched_job = drm_sched_entity_pop_job(entity);
|
|
|
|
complete(&entity->entity_idle);
|
|
|
|
if (!sched_job)
|
|
continue;
|
|
|
|
s_fence = sched_job->s_fence;
|
|
|
|
atomic_inc(&sched->hw_rq_count);
|
|
drm_sched_job_begin(sched_job);
|
|
|
|
trace_drm_run_job(sched_job, entity);
|
|
fence = sched->ops->run_job(sched_job);
|
|
drm_sched_fence_scheduled(s_fence);
|
|
|
|
if (!IS_ERR_OR_NULL(fence)) {
|
|
s_fence->parent = dma_fence_get(fence);
|
|
r = dma_fence_add_callback(fence, &sched_job->cb,
|
|
drm_sched_process_job);
|
|
if (r == -ENOENT)
|
|
drm_sched_process_job(fence, &sched_job->cb);
|
|
else if (r)
|
|
DRM_ERROR("fence add callback failed (%d)\n",
|
|
r);
|
|
dma_fence_put(fence);
|
|
} else {
|
|
if (IS_ERR(fence))
|
|
dma_fence_set_error(&s_fence->finished, PTR_ERR(fence));
|
|
|
|
drm_sched_process_job(NULL, &sched_job->cb);
|
|
}
|
|
|
|
wake_up(&sched->job_scheduled);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drm_sched_init - Init a gpu scheduler instance
|
|
*
|
|
* @sched: scheduler instance
|
|
* @ops: backend operations for this scheduler
|
|
* @hw_submission: number of hw submissions that can be in flight
|
|
* @hang_limit: number of times to allow a job to hang before dropping it
|
|
* @timeout: timeout value in jiffies for the scheduler
|
|
* @name: name used for debugging
|
|
*
|
|
* Return 0 on success, otherwise error code.
|
|
*/
|
|
int drm_sched_init(struct drm_gpu_scheduler *sched,
|
|
const struct drm_sched_backend_ops *ops,
|
|
unsigned hw_submission,
|
|
unsigned hang_limit,
|
|
long timeout,
|
|
const char *name)
|
|
{
|
|
int i, ret;
|
|
sched->ops = ops;
|
|
sched->hw_submission_limit = hw_submission;
|
|
sched->name = name;
|
|
sched->timeout = timeout;
|
|
sched->hang_limit = hang_limit;
|
|
for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_MAX; i++)
|
|
drm_sched_rq_init(sched, &sched->sched_rq[i]);
|
|
|
|
init_waitqueue_head(&sched->wake_up_worker);
|
|
init_waitqueue_head(&sched->job_scheduled);
|
|
INIT_LIST_HEAD(&sched->ring_mirror_list);
|
|
spin_lock_init(&sched->job_list_lock);
|
|
atomic_set(&sched->hw_rq_count, 0);
|
|
INIT_DELAYED_WORK(&sched->work_tdr, drm_sched_job_timedout);
|
|
atomic_set(&sched->num_jobs, 0);
|
|
atomic64_set(&sched->job_id_count, 0);
|
|
|
|
/* Each scheduler will run on a seperate kernel thread */
|
|
sched->thread = kthread_run(drm_sched_main, sched, sched->name);
|
|
if (IS_ERR(sched->thread)) {
|
|
ret = PTR_ERR(sched->thread);
|
|
sched->thread = NULL;
|
|
DRM_ERROR("Failed to create scheduler for %s.\n", name);
|
|
return ret;
|
|
}
|
|
|
|
sched->ready = true;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_sched_init);
|
|
|
|
/**
|
|
* drm_sched_fini - Destroy a gpu scheduler
|
|
*
|
|
* @sched: scheduler instance
|
|
*
|
|
* Tears down and cleans up the scheduler.
|
|
*/
|
|
void drm_sched_fini(struct drm_gpu_scheduler *sched)
|
|
{
|
|
if (sched->thread)
|
|
kthread_stop(sched->thread);
|
|
|
|
sched->ready = false;
|
|
}
|
|
EXPORT_SYMBOL(drm_sched_fini);
|