1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* Copyright 2015 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <drm/gpu_scheduler.h>
static struct kmem_cache *sched_fence_slab;
static int __init drm_sched_fence_slab_init(void)
{
sched_fence_slab = kmem_cache_create(
"drm_sched_fence", sizeof(struct drm_sched_fence), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!sched_fence_slab)
return -ENOMEM;
return 0;
}
static void __exit drm_sched_fence_slab_fini(void)
{
rcu_barrier();
kmem_cache_destroy(sched_fence_slab);
}
void drm_sched_fence_scheduled(struct drm_sched_fence *fence)
{
dma_fence_signal(&fence->scheduled);
}
void drm_sched_fence_finished(struct drm_sched_fence *fence)
{
dma_fence_signal(&fence->finished);
}
static const char *drm_sched_fence_get_driver_name(struct dma_fence *fence)
{
return "drm_sched";
}
static const char *drm_sched_fence_get_timeline_name(struct dma_fence *f)
{
struct drm_sched_fence *fence = to_drm_sched_fence(f);
return (const char *)fence->sched->name;
}
static void drm_sched_fence_free_rcu(struct rcu_head *rcu)
{
struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
struct drm_sched_fence *fence = to_drm_sched_fence(f);
if (!WARN_ON_ONCE(!fence))
kmem_cache_free(sched_fence_slab, fence);
}
/**
* drm_sched_fence_free - free up an uninitialized fence
*
* @fence: fence to free
*
* Free up the fence memory. Should only be used if drm_sched_fence_init()
* has not been called yet.
*/
void drm_sched_fence_free(struct drm_sched_fence *fence)
{
/* This function should not be called if the fence has been initialized. */
if (!WARN_ON_ONCE(fence->sched))
kmem_cache_free(sched_fence_slab, fence);
}
/**
* drm_sched_fence_release_scheduled - callback that fence can be freed
*
* @f: fence
*
* This function is called when the reference count becomes zero.
* It just RCU schedules freeing up the fence.
*/
static void drm_sched_fence_release_scheduled(struct dma_fence *f)
{
struct drm_sched_fence *fence = to_drm_sched_fence(f);
dma_fence_put(fence->parent);
call_rcu(&fence->finished.rcu, drm_sched_fence_free_rcu);
}
/**
* drm_sched_fence_release_finished - drop extra reference
*
* @f: fence
*
* Drop the extra reference from the scheduled fence to the base fence.
*/
static void drm_sched_fence_release_finished(struct dma_fence *f)
{
struct drm_sched_fence *fence = to_drm_sched_fence(f);
dma_fence_put(&fence->scheduled);
}
static const struct dma_fence_ops drm_sched_fence_ops_scheduled = {
.get_driver_name = drm_sched_fence_get_driver_name,
.get_timeline_name = drm_sched_fence_get_timeline_name,
.release = drm_sched_fence_release_scheduled,
};
static const struct dma_fence_ops drm_sched_fence_ops_finished = {
.get_driver_name = drm_sched_fence_get_driver_name,
.get_timeline_name = drm_sched_fence_get_timeline_name,
.release = drm_sched_fence_release_finished,
};
struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f)
{
if (f->ops == &drm_sched_fence_ops_scheduled)
return container_of(f, struct drm_sched_fence, scheduled);
if (f->ops == &drm_sched_fence_ops_finished)
return container_of(f, struct drm_sched_fence, finished);
return NULL;
}
EXPORT_SYMBOL(to_drm_sched_fence);
struct drm_sched_fence *drm_sched_fence_alloc(struct drm_sched_entity *entity,
void *owner)
{
struct drm_sched_fence *fence = NULL;
fence = kmem_cache_zalloc(sched_fence_slab, GFP_KERNEL);
if (fence == NULL)
return NULL;
fence->owner = owner;
spin_lock_init(&fence->lock);
return fence;
}
void drm_sched_fence_init(struct drm_sched_fence *fence,
struct drm_sched_entity *entity)
{
unsigned seq;
fence->sched = entity->rq->sched;
seq = atomic_inc_return(&entity->fence_seq);
dma_fence_init(&fence->scheduled, &drm_sched_fence_ops_scheduled,
&fence->lock, entity->fence_context, seq);
dma_fence_init(&fence->finished, &drm_sched_fence_ops_finished,
&fence->lock, entity->fence_context + 1, seq);
}
module_init(drm_sched_fence_slab_init);
module_exit(drm_sched_fence_slab_fini);
MODULE_DESCRIPTION("DRM GPU scheduler");
MODULE_LICENSE("GPL and additional rights");
|
