![Nayan Deshmukh](/assets/img/avatar_default.png)
The scheduler of the entity is decided by the run queue on which it is queued. This patch avoids us the effort required to maintain a sync between rq and sched field when we start shifting entites among different rqs. Signed-off-by: Nayan Deshmukh <nayan26deshmukh@gmail.com> Reviewed-by: Christian König <christian.koenig@amd.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
181 lines
5.1 KiB
C
181 lines
5.1 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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#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 <drm/gpu_scheduler.h>
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static struct kmem_cache *sched_fence_slab;
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static int __init drm_sched_fence_slab_init(void)
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{
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sched_fence_slab = kmem_cache_create(
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"drm_sched_fence", sizeof(struct drm_sched_fence), 0,
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SLAB_HWCACHE_ALIGN, NULL);
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if (!sched_fence_slab)
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return -ENOMEM;
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return 0;
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}
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static void __exit drm_sched_fence_slab_fini(void)
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{
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rcu_barrier();
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kmem_cache_destroy(sched_fence_slab);
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}
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void drm_sched_fence_scheduled(struct drm_sched_fence *fence)
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{
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int ret = dma_fence_signal(&fence->scheduled);
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if (!ret)
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DMA_FENCE_TRACE(&fence->scheduled,
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"signaled from irq context\n");
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else
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DMA_FENCE_TRACE(&fence->scheduled,
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"was already signaled\n");
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}
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void drm_sched_fence_finished(struct drm_sched_fence *fence)
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{
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int ret = dma_fence_signal(&fence->finished);
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if (!ret)
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DMA_FENCE_TRACE(&fence->finished,
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"signaled from irq context\n");
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else
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DMA_FENCE_TRACE(&fence->finished,
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"was already signaled\n");
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}
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static const char *drm_sched_fence_get_driver_name(struct dma_fence *fence)
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{
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return "drm_sched";
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}
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static const char *drm_sched_fence_get_timeline_name(struct dma_fence *f)
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{
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struct drm_sched_fence *fence = to_drm_sched_fence(f);
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return (const char *)fence->sched->name;
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}
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/**
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* drm_sched_fence_free - free up the fence memory
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*
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* @rcu: RCU callback head
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*
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* Free up the fence memory after the RCU grace period.
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*/
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static void drm_sched_fence_free(struct rcu_head *rcu)
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{
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struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
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struct drm_sched_fence *fence = to_drm_sched_fence(f);
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kmem_cache_free(sched_fence_slab, fence);
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}
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/**
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* drm_sched_fence_release_scheduled - callback that fence can be freed
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*
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* @fence: fence
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*
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* This function is called when the reference count becomes zero.
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* It just RCU schedules freeing up the fence.
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*/
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static void drm_sched_fence_release_scheduled(struct dma_fence *f)
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{
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struct drm_sched_fence *fence = to_drm_sched_fence(f);
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dma_fence_put(fence->parent);
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call_rcu(&fence->finished.rcu, drm_sched_fence_free);
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}
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/**
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* drm_sched_fence_release_finished - drop extra reference
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*
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* @f: fence
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*
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* Drop the extra reference from the scheduled fence to the base fence.
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*/
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static void drm_sched_fence_release_finished(struct dma_fence *f)
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{
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struct drm_sched_fence *fence = to_drm_sched_fence(f);
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dma_fence_put(&fence->scheduled);
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}
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const struct dma_fence_ops drm_sched_fence_ops_scheduled = {
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.get_driver_name = drm_sched_fence_get_driver_name,
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.get_timeline_name = drm_sched_fence_get_timeline_name,
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.release = drm_sched_fence_release_scheduled,
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};
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const struct dma_fence_ops drm_sched_fence_ops_finished = {
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.get_driver_name = drm_sched_fence_get_driver_name,
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.get_timeline_name = drm_sched_fence_get_timeline_name,
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.release = drm_sched_fence_release_finished,
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};
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struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f)
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{
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if (f->ops == &drm_sched_fence_ops_scheduled)
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return container_of(f, struct drm_sched_fence, scheduled);
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if (f->ops == &drm_sched_fence_ops_finished)
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return container_of(f, struct drm_sched_fence, finished);
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return NULL;
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}
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EXPORT_SYMBOL(to_drm_sched_fence);
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struct drm_sched_fence *drm_sched_fence_create(struct drm_sched_entity *entity,
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void *owner)
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{
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struct drm_sched_fence *fence = NULL;
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unsigned seq;
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fence = kmem_cache_zalloc(sched_fence_slab, GFP_KERNEL);
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if (fence == NULL)
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return NULL;
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fence->owner = owner;
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fence->sched = entity->rq->sched;
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spin_lock_init(&fence->lock);
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seq = atomic_inc_return(&entity->fence_seq);
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dma_fence_init(&fence->scheduled, &drm_sched_fence_ops_scheduled,
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&fence->lock, entity->fence_context, seq);
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dma_fence_init(&fence->finished, &drm_sched_fence_ops_finished,
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&fence->lock, entity->fence_context + 1, seq);
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return fence;
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}
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module_init(drm_sched_fence_slab_init);
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module_exit(drm_sched_fence_slab_fini);
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MODULE_DESCRIPTION("DRM GPU scheduler");
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MODULE_LICENSE("GPL and additional rights");
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