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
fence_complete(struct dma_fence_work * f)14 static 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
fence_work(struct work_struct * work)21 static 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
34 static int __i915_sw_fence_call
fence_notify(struct i915_sw_fence * fence,enum i915_sw_fence_notify state)35 fence_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
get_driver_name(struct dma_fence * fence)60 static const char *get_driver_name(struct dma_fence *fence)
61 {
62 return "dma-fence";
63 }
64
get_timeline_name(struct dma_fence * fence)65 static 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
fence_release(struct dma_fence * fence)72 static 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
83 static 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
dma_fence_work_init(struct dma_fence_work * f,const struct dma_fence_work_ops * ops)89 void 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
dma_fence_work_chain(struct dma_fence_work * f,struct dma_fence * signal)99 int 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