1/*	$NetBSD: i915_sw_fence_work.c,v 1.4 2021/12/19 12:13:37 riastradh Exp $	*/
2
3// SPDX-License-Identifier: MIT
4
5/*
6 * Copyright �� 2019 Intel Corporation
7 */
8
9#include <sys/cdefs.h>
10__KERNEL_RCSID(0, "$NetBSD: i915_sw_fence_work.c,v 1.4 2021/12/19 12:13:37 riastradh Exp $");
11
12#include "i915_sw_fence_work.h"
13
14static void fence_complete(struct dma_fence_work *f)
15{
16	if (f->ops->release)
17		f->ops->release(f);
18	dma_fence_signal(&f->dma);
19}
20
21static void fence_work(struct work_struct *work)
22{
23	struct dma_fence_work *f = container_of(work, typeof(*f), work);
24	int err;
25
26	err = f->ops->work(f);
27	if (err)
28		dma_fence_set_error(&f->dma, err);
29
30	fence_complete(f);
31	dma_fence_put(&f->dma);
32}
33
34static int __i915_sw_fence_call
35fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
36{
37	struct dma_fence_work *f = container_of(fence, typeof(*f), chain);
38
39	switch (state) {
40	case FENCE_COMPLETE:
41		if (fence->error)
42			dma_fence_set_error(&f->dma, fence->error);
43
44		if (!f->dma.error) {
45			dma_fence_get(&f->dma);
46			queue_work(system_unbound_wq, &f->work);
47		} else {
48			fence_complete(f);
49		}
50		break;
51
52	case FENCE_FREE:
53		dma_fence_put(&f->dma);
54		break;
55	}
56
57	return NOTIFY_DONE;
58}
59
60static const char *get_driver_name(struct dma_fence *fence)
61{
62	return "dma-fence";
63}
64
65static const char *get_timeline_name(struct dma_fence *fence)
66{
67	struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
68
69	return f->ops->name ?: "work";
70}
71
72static void fence_release(struct dma_fence *fence)
73{
74	struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
75
76	i915_sw_fence_fini(&f->chain);
77
78	BUILD_BUG_ON(offsetof(typeof(*f), dma));
79	spin_lock_destroy(&f->lock);
80	dma_fence_free(&f->dma);
81}
82
83static const struct dma_fence_ops fence_ops = {
84	.get_driver_name = get_driver_name,
85	.get_timeline_name = get_timeline_name,
86	.release = fence_release,
87};
88
89void dma_fence_work_init(struct dma_fence_work *f,
90			 const struct dma_fence_work_ops *ops)
91{
92	f->ops = ops;
93	spin_lock_init(&f->lock);
94	dma_fence_init(&f->dma, &fence_ops, &f->lock, 0, 0);
95	i915_sw_fence_init(&f->chain, fence_notify);
96	INIT_WORK(&f->work, fence_work);
97}
98
99int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal)
100{
101	if (!signal)
102		return 0;
103
104	return __i915_sw_fence_await_dma_fence(&f->chain, signal, &f->cb);
105}
106