tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: MIT
2
3/*
4 * Copyright © 2019 Intel Corporation
5 */
6
7#include "i915_sw_fence_work.h"
8
9static void fence_work(struct work_struct *work)
10{
11 struct dma_fence_work *f = container_of(work, typeof(*f), work);
12 int err;
13
14 err = f->ops->work(f);
15 if (err)
16 dma_fence_set_error(&f->dma, err);
17 dma_fence_signal(&f->dma);
18 dma_fence_put(&f->dma);
19}
20
21static int __i915_sw_fence_call
22fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
23{
24 struct dma_fence_work *f = container_of(fence, typeof(*f), chain);
25
26 switch (state) {
27 case FENCE_COMPLETE:
28 if (fence->error)
29 dma_fence_set_error(&f->dma, fence->error);
30
31 if (!f->dma.error) {
32 dma_fence_get(&f->dma);
33 queue_work(system_unbound_wq, &f->work);
34 } else {
35 dma_fence_signal(&f->dma);
36 }
37 break;
38
39 case FENCE_FREE:
40 dma_fence_put(&f->dma);
41 break;
42 }
43
44 return NOTIFY_DONE;
45}
46
47static const char *get_driver_name(struct dma_fence *fence)
48{
49 return "dma-fence";
50}
51
52static const char *get_timeline_name(struct dma_fence *fence)
53{
54 struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
55
56 return f->ops->name ?: "work";
57}
58
59static void fence_release(struct dma_fence *fence)
60{
61 struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
62
63 if (f->ops->release)
64 f->ops->release(f);
65
66 i915_sw_fence_fini(&f->chain);
67
68 BUILD_BUG_ON(offsetof(typeof(*f), dma));
69 dma_fence_free(&f->dma);
70}
71
72static const struct dma_fence_ops fence_ops = {
73 .get_driver_name = get_driver_name,
74 .get_timeline_name = get_timeline_name,
75 .release = fence_release,
76};
77
78void dma_fence_work_init(struct dma_fence_work *f,
79 const struct dma_fence_work_ops *ops)
80{
81 f->ops = ops;
82 spin_lock_init(&f->lock);
83 dma_fence_init(&f->dma, &fence_ops, &f->lock, 0, 0);
84 i915_sw_fence_init(&f->chain, fence_notify);
85 INIT_WORK(&f->work, fence_work);
86}
87
88int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal)
89{
90 if (!signal)
91 return 0;
92
93 return __i915_sw_fence_await_dma_fence(&f->chain, signal, &f->cb);
94}