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/wait.h>
26 #include <linux/sched.h>
27 #include <drm/drmP.h>
28 #include "gpu_scheduler.h"
29
amd_sched_fence_create(struct amd_sched_entity * s_entity,void * owner)30 struct amd_sched_fence *amd_sched_fence_create(struct amd_sched_entity *s_entity, void *owner)
31 {
32 struct amd_sched_fence *fence = NULL;
33 unsigned seq;
34
35 fence = kmem_cache_zalloc(sched_fence_slab, GFP_KERNEL);
36 if (fence == NULL)
37 return NULL;
38
39 INIT_LIST_HEAD(&fence->scheduled_cb);
40 fence->owner = owner;
41 fence->sched = s_entity->sched;
42 spin_lock_init(&fence->lock);
43
44 seq = atomic_inc_return(&s_entity->fence_seq);
45 fence_init(&fence->base, &amd_sched_fence_ops, &fence->lock,
46 s_entity->fence_context, seq);
47
48 return fence;
49 }
50
amd_sched_fence_signal(struct amd_sched_fence * fence)51 void amd_sched_fence_signal(struct amd_sched_fence *fence)
52 {
53 int ret = fence_signal(&fence->base);
54 if (!ret)
55 FENCE_TRACE(&fence->base, "signaled from irq context\n");
56 else
57 FENCE_TRACE(&fence->base, "was already signaled\n");
58 }
59
amd_sched_fence_scheduled(struct amd_sched_fence * s_fence)60 void amd_sched_fence_scheduled(struct amd_sched_fence *s_fence)
61 {
62 struct fence_cb *cur, *tmp;
63
64 set_bit(AMD_SCHED_FENCE_SCHEDULED_BIT, &s_fence->base.flags);
65 list_for_each_entry_safe(cur, tmp, &s_fence->scheduled_cb, node) {
66 list_del_init(&cur->node);
67 cur->func(&s_fence->base, cur);
68 }
69 }
70
amd_sched_fence_get_driver_name(struct fence * fence)71 static const char *amd_sched_fence_get_driver_name(struct fence *fence)
72 {
73 return "amd_sched";
74 }
75
amd_sched_fence_get_timeline_name(struct fence * f)76 static const char *amd_sched_fence_get_timeline_name(struct fence *f)
77 {
78 struct amd_sched_fence *fence = to_amd_sched_fence(f);
79 return (const char *)fence->sched->name;
80 }
81
amd_sched_fence_enable_signaling(struct fence * f)82 static bool amd_sched_fence_enable_signaling(struct fence *f)
83 {
84 return true;
85 }
86
amd_sched_fence_release(struct fence * f)87 static void amd_sched_fence_release(struct fence *f)
88 {
89 struct amd_sched_fence *fence = to_amd_sched_fence(f);
90 kmem_cache_free(sched_fence_slab, fence);
91 }
92
93 const struct fence_ops amd_sched_fence_ops = {
94 .get_driver_name = amd_sched_fence_get_driver_name,
95 .get_timeline_name = amd_sched_fence_get_timeline_name,
96 .enable_signaling = amd_sched_fence_enable_signaling,
97 .signaled = NULL,
98 .wait = fence_default_wait,
99 .release = amd_sched_fence_release,
100 };
101