Loading...
1/*
2 * Copyright 2015 Advanced Micro Devices, Inc.
3 *
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:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
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.
21 *
22 */
23
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>
29
30#include <drm/gpu_scheduler.h>
31
32static struct kmem_cache *sched_fence_slab;
33
34static int __init drm_sched_fence_slab_init(void)
35{
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)
40 return -ENOMEM;
41
42 return 0;
43}
44
45static void __exit drm_sched_fence_slab_fini(void)
46{
47 rcu_barrier();
48 kmem_cache_destroy(sched_fence_slab);
49}
50
51void drm_sched_fence_scheduled(struct drm_sched_fence *fence)
52{
53 int ret = dma_fence_signal(&fence->scheduled);
54
55 if (!ret)
56 DMA_FENCE_TRACE(&fence->scheduled,
57 "signaled from irq context\n");
58 else
59 DMA_FENCE_TRACE(&fence->scheduled,
60 "was already signaled\n");
61}
62
63void drm_sched_fence_finished(struct drm_sched_fence *fence)
64{
65 int ret = dma_fence_signal(&fence->finished);
66
67 if (!ret)
68 DMA_FENCE_TRACE(&fence->finished,
69 "signaled from irq context\n");
70 else
71 DMA_FENCE_TRACE(&fence->finished,
72 "was already signaled\n");
73}
74
75static const char *drm_sched_fence_get_driver_name(struct dma_fence *fence)
76{
77 return "drm_sched";
78}
79
80static const char *drm_sched_fence_get_timeline_name(struct dma_fence *f)
81{
82 struct drm_sched_fence *fence = to_drm_sched_fence(f);
83 return (const char *)fence->sched->name;
84}
85
86/**
87 * drm_sched_fence_free - free up the fence memory
88 *
89 * @rcu: RCU callback head
90 *
91 * Free up the fence memory after the RCU grace period.
92 */
93static void drm_sched_fence_free(struct rcu_head *rcu)
94{
95 struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
96 struct drm_sched_fence *fence = to_drm_sched_fence(f);
97
98 kmem_cache_free(sched_fence_slab, fence);
99}
100
101/**
102 * drm_sched_fence_release_scheduled - callback that fence can be freed
103 *
104 * @fence: fence
105 *
106 * This function is called when the reference count becomes zero.
107 * It just RCU schedules freeing up the fence.
108 */
109static void drm_sched_fence_release_scheduled(struct dma_fence *f)
110{
111 struct drm_sched_fence *fence = to_drm_sched_fence(f);
112
113 dma_fence_put(fence->parent);
114 call_rcu(&fence->finished.rcu, drm_sched_fence_free);
115}
116
117/**
118 * drm_sched_fence_release_finished - drop extra reference
119 *
120 * @f: fence
121 *
122 * Drop the extra reference from the scheduled fence to the base fence.
123 */
124static void drm_sched_fence_release_finished(struct dma_fence *f)
125{
126 struct drm_sched_fence *fence = to_drm_sched_fence(f);
127
128 dma_fence_put(&fence->scheduled);
129}
130
131const struct dma_fence_ops drm_sched_fence_ops_scheduled = {
132 .get_driver_name = drm_sched_fence_get_driver_name,
133 .get_timeline_name = drm_sched_fence_get_timeline_name,
134 .release = drm_sched_fence_release_scheduled,
135};
136
137const struct dma_fence_ops drm_sched_fence_ops_finished = {
138 .get_driver_name = drm_sched_fence_get_driver_name,
139 .get_timeline_name = drm_sched_fence_get_timeline_name,
140 .release = drm_sched_fence_release_finished,
141};
142
143struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f)
144{
145 if (f->ops == &drm_sched_fence_ops_scheduled)
146 return container_of(f, struct drm_sched_fence, scheduled);
147
148 if (f->ops == &drm_sched_fence_ops_finished)
149 return container_of(f, struct drm_sched_fence, finished);
150
151 return NULL;
152}
153EXPORT_SYMBOL(to_drm_sched_fence);
154
155struct drm_sched_fence *drm_sched_fence_create(struct drm_sched_entity *entity,
156 void *owner)
157{
158 struct drm_sched_fence *fence = NULL;
159 unsigned seq;
160
161 fence = kmem_cache_zalloc(sched_fence_slab, GFP_KERNEL);
162 if (fence == NULL)
163 return NULL;
164
165 fence->owner = owner;
166 fence->sched = entity->rq->sched;
167 spin_lock_init(&fence->lock);
168
169 seq = atomic_inc_return(&entity->fence_seq);
170 dma_fence_init(&fence->scheduled, &drm_sched_fence_ops_scheduled,
171 &fence->lock, entity->fence_context, seq);
172 dma_fence_init(&fence->finished, &drm_sched_fence_ops_finished,
173 &fence->lock, entity->fence_context + 1, seq);
174
175 return fence;
176}
177
178module_init(drm_sched_fence_slab_init);
179module_exit(drm_sched_fence_slab_fini);
180
181MODULE_DESCRIPTION("DRM GPU scheduler");
182MODULE_LICENSE("GPL and additional rights");
1/*
2 * Copyright 2015 Advanced Micro Devices, Inc.
3 *
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:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
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.
21 *
22 */
23
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>
29
30#include <drm/gpu_scheduler.h>
31
32static struct kmem_cache *sched_fence_slab;
33
34static int __init drm_sched_fence_slab_init(void)
35{
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)
40 return -ENOMEM;
41
42 return 0;
43}
44
45static void __exit drm_sched_fence_slab_fini(void)
46{
47 rcu_barrier();
48 kmem_cache_destroy(sched_fence_slab);
49}
50
51void drm_sched_fence_scheduled(struct drm_sched_fence *fence)
52{
53 dma_fence_signal(&fence->scheduled);
54}
55
56void drm_sched_fence_finished(struct drm_sched_fence *fence)
57{
58 dma_fence_signal(&fence->finished);
59}
60
61static const char *drm_sched_fence_get_driver_name(struct dma_fence *fence)
62{
63 return "drm_sched";
64}
65
66static const char *drm_sched_fence_get_timeline_name(struct dma_fence *f)
67{
68 struct drm_sched_fence *fence = to_drm_sched_fence(f);
69 return (const char *)fence->sched->name;
70}
71
72static void drm_sched_fence_free_rcu(struct rcu_head *rcu)
73{
74 struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
75 struct drm_sched_fence *fence = to_drm_sched_fence(f);
76
77 if (!WARN_ON_ONCE(!fence))
78 kmem_cache_free(sched_fence_slab, fence);
79}
80
81/**
82 * drm_sched_fence_free - free up an uninitialized fence
83 *
84 * @fence: fence to free
85 *
86 * Free up the fence memory. Should only be used if drm_sched_fence_init()
87 * has not been called yet.
88 */
89void drm_sched_fence_free(struct drm_sched_fence *fence)
90{
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);
94}
95
96/**
97 * drm_sched_fence_release_scheduled - callback that fence can be freed
98 *
99 * @f: fence
100 *
101 * This function is called when the reference count becomes zero.
102 * It just RCU schedules freeing up the fence.
103 */
104static void drm_sched_fence_release_scheduled(struct dma_fence *f)
105{
106 struct drm_sched_fence *fence = to_drm_sched_fence(f);
107
108 dma_fence_put(fence->parent);
109 call_rcu(&fence->finished.rcu, drm_sched_fence_free_rcu);
110}
111
112/**
113 * drm_sched_fence_release_finished - drop extra reference
114 *
115 * @f: fence
116 *
117 * Drop the extra reference from the scheduled fence to the base fence.
118 */
119static void drm_sched_fence_release_finished(struct dma_fence *f)
120{
121 struct drm_sched_fence *fence = to_drm_sched_fence(f);
122
123 dma_fence_put(&fence->scheduled);
124}
125
126static 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,
130};
131
132static 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,
136};
137
138struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f)
139{
140 if (f->ops == &drm_sched_fence_ops_scheduled)
141 return container_of(f, struct drm_sched_fence, scheduled);
142
143 if (f->ops == &drm_sched_fence_ops_finished)
144 return container_of(f, struct drm_sched_fence, finished);
145
146 return NULL;
147}
148EXPORT_SYMBOL(to_drm_sched_fence);
149
150struct drm_sched_fence *drm_sched_fence_alloc(struct drm_sched_entity *entity,
151 void *owner)
152{
153 struct drm_sched_fence *fence = NULL;
154
155 fence = kmem_cache_zalloc(sched_fence_slab, GFP_KERNEL);
156 if (fence == NULL)
157 return NULL;
158
159 fence->owner = owner;
160 spin_lock_init(&fence->lock);
161
162 return fence;
163}
164
165void drm_sched_fence_init(struct drm_sched_fence *fence,
166 struct drm_sched_entity *entity)
167{
168 unsigned seq;
169
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);
176}
177
178module_init(drm_sched_fence_slab_init);
179module_exit(drm_sched_fence_slab_fini);
180
181MODULE_DESCRIPTION("DRM GPU scheduler");
182MODULE_LICENSE("GPL and additional rights");