2 * Copyright 2015 Advanced Micro Devices, Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
24 #include <linux/kthread.h>
25 #include <linux/module.h>
26 #include <linux/sched.h>
27 #include <linux/slab.h>
28 #include <linux/wait.h>
30 #include <drm/gpu_scheduler.h>
32 static struct kmem_cache *sched_fence_slab;
34 static int __init drm_sched_fence_slab_init(void)
36 sched_fence_slab = kmem_cache_create(
37 "drm_sched_fence", sizeof(struct drm_sched_fence), 0,
38 SLAB_HWCACHE_ALIGN, NULL);
39 if (!sched_fence_slab)
45 static void __exit drm_sched_fence_slab_fini(void)
48 kmem_cache_destroy(sched_fence_slab);
51 void drm_sched_fence_scheduled(struct drm_sched_fence *fence)
53 dma_fence_signal(&fence->scheduled);
56 void drm_sched_fence_finished(struct drm_sched_fence *fence)
58 dma_fence_signal(&fence->finished);
61 static const char *drm_sched_fence_get_driver_name(struct dma_fence *fence)
66 static const char *drm_sched_fence_get_timeline_name(struct dma_fence *f)
68 struct drm_sched_fence *fence = to_drm_sched_fence(f);
69 return (const char *)fence->sched->name;
72 static void drm_sched_fence_free_rcu(struct rcu_head *rcu)
74 struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
75 struct drm_sched_fence *fence = to_drm_sched_fence(f);
77 if (!WARN_ON_ONCE(!fence))
78 kmem_cache_free(sched_fence_slab, fence);
82 * drm_sched_fence_free - free up an uninitialized fence
84 * @fence: fence to free
86 * Free up the fence memory. Should only be used if drm_sched_fence_init()
87 * has not been called yet.
89 void drm_sched_fence_free(struct drm_sched_fence *fence)
91 /* This function should not be called if the fence has been initialized. */
92 if (!WARN_ON_ONCE(fence->sched))
93 kmem_cache_free(sched_fence_slab, fence);
97 * drm_sched_fence_release_scheduled - callback that fence can be freed
101 * This function is called when the reference count becomes zero.
102 * It just RCU schedules freeing up the fence.
104 static void drm_sched_fence_release_scheduled(struct dma_fence *f)
106 struct drm_sched_fence *fence = to_drm_sched_fence(f);
108 dma_fence_put(fence->parent);
109 call_rcu(&fence->finished.rcu, drm_sched_fence_free_rcu);
113 * drm_sched_fence_release_finished - drop extra reference
117 * Drop the extra reference from the scheduled fence to the base fence.
119 static void drm_sched_fence_release_finished(struct dma_fence *f)
121 struct drm_sched_fence *fence = to_drm_sched_fence(f);
123 dma_fence_put(&fence->scheduled);
126 static const struct dma_fence_ops drm_sched_fence_ops_scheduled = {
127 .get_driver_name = drm_sched_fence_get_driver_name,
128 .get_timeline_name = drm_sched_fence_get_timeline_name,
129 .release = drm_sched_fence_release_scheduled,
132 static const struct dma_fence_ops drm_sched_fence_ops_finished = {
133 .get_driver_name = drm_sched_fence_get_driver_name,
134 .get_timeline_name = drm_sched_fence_get_timeline_name,
135 .release = drm_sched_fence_release_finished,
138 struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f)
140 if (f->ops == &drm_sched_fence_ops_scheduled)
141 return container_of(f, struct drm_sched_fence, scheduled);
143 if (f->ops == &drm_sched_fence_ops_finished)
144 return container_of(f, struct drm_sched_fence, finished);
148 EXPORT_SYMBOL(to_drm_sched_fence);
150 struct drm_sched_fence *drm_sched_fence_alloc(struct drm_sched_entity *entity,
153 struct drm_sched_fence *fence = NULL;
155 fence = kmem_cache_zalloc(sched_fence_slab, GFP_KERNEL);
159 fence->owner = owner;
160 spin_lock_init(&fence->lock);
165 void drm_sched_fence_init(struct drm_sched_fence *fence,
166 struct drm_sched_entity *entity)
170 fence->sched = entity->rq->sched;
171 seq = atomic_inc_return(&entity->fence_seq);
172 dma_fence_init(&fence->scheduled, &drm_sched_fence_ops_scheduled,
173 &fence->lock, entity->fence_context, seq);
174 dma_fence_init(&fence->finished, &drm_sched_fence_ops_finished,
175 &fence->lock, entity->fence_context + 1, seq);
178 module_init(drm_sched_fence_slab_init);
179 module_exit(drm_sched_fence_slab_fini);
181 MODULE_DESCRIPTION("DRM GPU scheduler");
182 MODULE_LICENSE("GPL and additional rights");