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cabaafc7 RC |
1 | /* |
2 | * Copyright (C) 2013 Red Hat | |
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 (including the next | |
12 | * paragraph) shall be included in all copies or substantial portions of the | |
13 | * Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
21 | * SOFTWARE. | |
22 | */ | |
23 | ||
24 | #include "drmP.h" | |
25 | #include "drm_flip_work.h" | |
26 | ||
27 | /** | |
28 | * drm_flip_work_queue - queue work | |
29 | * @work: the flip-work | |
30 | * @val: the value to queue | |
31 | * | |
32 | * Queues work, that will later be run (passed back to drm_flip_func_t | |
33 | * func) on a work queue after drm_flip_work_commit() is called. | |
34 | */ | |
35 | void drm_flip_work_queue(struct drm_flip_work *work, void *val) | |
36 | { | |
37 | if (kfifo_put(&work->fifo, (const void **)&val)) { | |
38 | atomic_inc(&work->pending); | |
39 | } else { | |
40 | DRM_ERROR("%s fifo full!\n", work->name); | |
41 | work->func(work, val); | |
42 | } | |
43 | } | |
44 | EXPORT_SYMBOL(drm_flip_work_queue); | |
45 | ||
46 | /** | |
47 | * drm_flip_work_commit - commit queued work | |
48 | * @work: the flip-work | |
49 | * @wq: the work-queue to run the queued work on | |
50 | * | |
51 | * Trigger work previously queued by drm_flip_work_queue() to run | |
52 | * on a workqueue. The typical usage would be to queue work (via | |
53 | * drm_flip_work_queue()) at any point (from vblank irq and/or | |
54 | * prior), and then from vblank irq commit the queued work. | |
55 | */ | |
56 | void drm_flip_work_commit(struct drm_flip_work *work, | |
57 | struct workqueue_struct *wq) | |
58 | { | |
59 | uint32_t pending = atomic_read(&work->pending); | |
60 | atomic_add(pending, &work->count); | |
61 | atomic_sub(pending, &work->pending); | |
62 | queue_work(wq, &work->worker); | |
63 | } | |
64 | EXPORT_SYMBOL(drm_flip_work_commit); | |
65 | ||
66 | static void flip_worker(struct work_struct *w) | |
67 | { | |
68 | struct drm_flip_work *work = container_of(w, struct drm_flip_work, worker); | |
69 | uint32_t count = atomic_read(&work->count); | |
70 | void *val = NULL; | |
71 | ||
72 | atomic_sub(count, &work->count); | |
73 | ||
74 | while(count--) | |
75 | if (!WARN_ON(!kfifo_get(&work->fifo, &val))) | |
76 | work->func(work, val); | |
77 | } | |
78 | ||
79 | /** | |
80 | * drm_flip_work_init - initialize flip-work | |
81 | * @work: the flip-work to initialize | |
82 | * @size: the max queue depth | |
83 | * @name: debug name | |
84 | * @func: the callback work function | |
85 | * | |
86 | * Initializes/allocates resources for the flip-work | |
87 | * | |
88 | * RETURNS: | |
89 | * Zero on success, error code on failure. | |
90 | */ | |
91 | int drm_flip_work_init(struct drm_flip_work *work, int size, | |
92 | const char *name, drm_flip_func_t func) | |
93 | { | |
94 | int ret; | |
95 | ||
96 | work->name = name; | |
97 | atomic_set(&work->count, 0); | |
98 | atomic_set(&work->pending, 0); | |
99 | work->func = func; | |
100 | ||
101 | ret = kfifo_alloc(&work->fifo, size, GFP_KERNEL); | |
102 | if (ret) { | |
103 | DRM_ERROR("could not allocate %s fifo\n", name); | |
104 | return ret; | |
105 | } | |
106 | ||
107 | INIT_WORK(&work->worker, flip_worker); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | EXPORT_SYMBOL(drm_flip_work_init); | |
112 | ||
113 | /** | |
114 | * drm_flip_work_cleanup - cleans up flip-work | |
115 | * @work: the flip-work to cleanup | |
116 | * | |
117 | * Destroy resources allocated for the flip-work | |
118 | */ | |
119 | void drm_flip_work_cleanup(struct drm_flip_work *work) | |
120 | { | |
121 | WARN_ON(!kfifo_is_empty(&work->fifo)); | |
122 | kfifo_free(&work->fifo); | |
123 | } | |
124 | EXPORT_SYMBOL(drm_flip_work_cleanup); |