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_complete(struct dma_fence_work *f)
10{
11	if (f->ops->release)
12		f->ops->release(f);
13	dma_fence_signal(&f->dma);
14}
15
16static void fence_work(struct work_struct *work)
17{
18	struct dma_fence_work *f = container_of(work, typeof(*f), work);
19
20	f->ops->work(f);
21
22	fence_complete(f);
23	dma_fence_put(&f->dma);
24}
25
26static int
27fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
28{
29	struct dma_fence_work *f = container_of(fence, typeof(*f), chain);
30
31	switch (state) {
32	case FENCE_COMPLETE:
33		if (fence->error)
34			dma_fence_set_error(&f->dma, fence->error);
35
36		if (!f->dma.error) {
37			dma_fence_get(&f->dma);
38			if (test_bit(DMA_FENCE_WORK_IMM, &f->dma.flags))
39				fence_work(&f->work);
40			else
41				queue_work(system_unbound_wq, &f->work);
42		} else {
43			fence_complete(f);
44		}
45		break;
46
47	case FENCE_FREE:
48		dma_fence_put(&f->dma);
49		break;
50	}
51
52	return NOTIFY_DONE;
53}
54
55static const char *get_driver_name(struct dma_fence *fence)
56{
57	return "dma-fence";
58}
59
60static const char *get_timeline_name(struct dma_fence *fence)
61{
62	struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
63
64	return f->ops->name ?: "work";
65}
66
67static void fence_release(struct dma_fence *fence)
68{
69	struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
70
71	i915_sw_fence_fini(&f->chain);
72
73	BUILD_BUG_ON(offsetof(typeof(*f), dma));
74	dma_fence_free(&f->dma);
75}
76
77static const struct dma_fence_ops fence_ops = {
78	.get_driver_name = get_driver_name,
79	.get_timeline_name = get_timeline_name,
80	.release = fence_release,
81};
82
83void dma_fence_work_init(struct dma_fence_work *f,
84			 const struct dma_fence_work_ops *ops)
85{
86	f->ops = ops;
87	spin_lock_init(&f->lock);
88	dma_fence_init(&f->dma, &fence_ops, &f->lock, 0, 0);
89	i915_sw_fence_init(&f->chain, fence_notify);
90	INIT_WORK(&f->work, fence_work);
91}
92
93int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal)
94{
95	if (!signal)
96		return 0;
97
98	return __i915_sw_fence_await_dma_fence(&f->chain, signal, &f->cb);
99}
100