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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 | ||
f9be5f20 ML |
24 | #include <drm/drmP.h> |
25 | #include <drm/drm_flip_work.h> | |
cabaafc7 | 26 | |
8bd4ae20 BB |
27 | /** |
28 | * drm_flip_work_allocate_task - allocate a flip-work task | |
29 | * @data: data associated to the task | |
30 | * @flags: allocator flags | |
31 | * | |
32 | * Allocate a drm_flip_task object and attach private data to it. | |
33 | */ | |
34 | struct drm_flip_task *drm_flip_work_allocate_task(void *data, gfp_t flags) | |
35 | { | |
36 | struct drm_flip_task *task; | |
37 | ||
38 | task = kzalloc(sizeof(*task), flags); | |
39 | if (task) | |
40 | task->data = data; | |
41 | ||
42 | return task; | |
43 | } | |
44 | EXPORT_SYMBOL(drm_flip_work_allocate_task); | |
45 | ||
46 | /** | |
47 | * drm_flip_work_queue_task - queue a specific task | |
48 | * @work: the flip-work | |
49 | * @task: the task to handle | |
50 | * | |
51 | * Queues task, that will later be run (passed back to drm_flip_func_t | |
52 | * func) on a work queue after drm_flip_work_commit() is called. | |
53 | */ | |
54 | void drm_flip_work_queue_task(struct drm_flip_work *work, | |
55 | struct drm_flip_task *task) | |
56 | { | |
57 | unsigned long flags; | |
58 | ||
59 | spin_lock_irqsave(&work->lock, flags); | |
60 | list_add_tail(&task->node, &work->queued); | |
61 | spin_unlock_irqrestore(&work->lock, flags); | |
62 | } | |
63 | EXPORT_SYMBOL(drm_flip_work_queue_task); | |
64 | ||
cabaafc7 RC |
65 | /** |
66 | * drm_flip_work_queue - queue work | |
67 | * @work: the flip-work | |
68 | * @val: the value to queue | |
69 | * | |
70 | * Queues work, that will later be run (passed back to drm_flip_func_t | |
71 | * func) on a work queue after drm_flip_work_commit() is called. | |
72 | */ | |
73 | void drm_flip_work_queue(struct drm_flip_work *work, void *val) | |
74 | { | |
8bd4ae20 BB |
75 | struct drm_flip_task *task; |
76 | ||
77 | task = drm_flip_work_allocate_task(val, | |
78 | drm_can_sleep() ? GFP_KERNEL : GFP_ATOMIC); | |
79 | if (task) { | |
80 | drm_flip_work_queue_task(work, task); | |
cabaafc7 | 81 | } else { |
8bd4ae20 | 82 | DRM_ERROR("%s could not allocate task!\n", work->name); |
cabaafc7 RC |
83 | work->func(work, val); |
84 | } | |
85 | } | |
86 | EXPORT_SYMBOL(drm_flip_work_queue); | |
87 | ||
88 | /** | |
89 | * drm_flip_work_commit - commit queued work | |
90 | * @work: the flip-work | |
91 | * @wq: the work-queue to run the queued work on | |
92 | * | |
93 | * Trigger work previously queued by drm_flip_work_queue() to run | |
94 | * on a workqueue. The typical usage would be to queue work (via | |
95 | * drm_flip_work_queue()) at any point (from vblank irq and/or | |
96 | * prior), and then from vblank irq commit the queued work. | |
97 | */ | |
98 | void drm_flip_work_commit(struct drm_flip_work *work, | |
99 | struct workqueue_struct *wq) | |
100 | { | |
8bd4ae20 BB |
101 | unsigned long flags; |
102 | ||
103 | spin_lock_irqsave(&work->lock, flags); | |
104 | list_splice_tail(&work->queued, &work->commited); | |
105 | INIT_LIST_HEAD(&work->queued); | |
106 | spin_unlock_irqrestore(&work->lock, flags); | |
cabaafc7 RC |
107 | queue_work(wq, &work->worker); |
108 | } | |
109 | EXPORT_SYMBOL(drm_flip_work_commit); | |
110 | ||
111 | static void flip_worker(struct work_struct *w) | |
112 | { | |
113 | struct drm_flip_work *work = container_of(w, struct drm_flip_work, worker); | |
8bd4ae20 BB |
114 | struct list_head tasks; |
115 | unsigned long flags; | |
cabaafc7 | 116 | |
8bd4ae20 BB |
117 | while (1) { |
118 | struct drm_flip_task *task, *tmp; | |
cabaafc7 | 119 | |
8bd4ae20 BB |
120 | INIT_LIST_HEAD(&tasks); |
121 | spin_lock_irqsave(&work->lock, flags); | |
122 | list_splice_tail(&work->commited, &tasks); | |
123 | INIT_LIST_HEAD(&work->commited); | |
124 | spin_unlock_irqrestore(&work->lock, flags); | |
125 | ||
126 | if (list_empty(&tasks)) | |
127 | break; | |
128 | ||
129 | list_for_each_entry_safe(task, tmp, &tasks, node) { | |
130 | work->func(work, task->data); | |
131 | kfree(task); | |
132 | } | |
133 | } | |
cabaafc7 RC |
134 | } |
135 | ||
136 | /** | |
137 | * drm_flip_work_init - initialize flip-work | |
138 | * @work: the flip-work to initialize | |
cabaafc7 RC |
139 | * @name: debug name |
140 | * @func: the callback work function | |
141 | * | |
142 | * Initializes/allocates resources for the flip-work | |
cabaafc7 | 143 | */ |
d7f8db53 | 144 | void drm_flip_work_init(struct drm_flip_work *work, |
cabaafc7 RC |
145 | const char *name, drm_flip_func_t func) |
146 | { | |
cabaafc7 | 147 | work->name = name; |
8bd4ae20 BB |
148 | INIT_LIST_HEAD(&work->queued); |
149 | INIT_LIST_HEAD(&work->commited); | |
150 | spin_lock_init(&work->lock); | |
cabaafc7 RC |
151 | work->func = func; |
152 | ||
cabaafc7 | 153 | INIT_WORK(&work->worker, flip_worker); |
cabaafc7 RC |
154 | } |
155 | EXPORT_SYMBOL(drm_flip_work_init); | |
156 | ||
157 | /** | |
158 | * drm_flip_work_cleanup - cleans up flip-work | |
159 | * @work: the flip-work to cleanup | |
160 | * | |
161 | * Destroy resources allocated for the flip-work | |
162 | */ | |
163 | void drm_flip_work_cleanup(struct drm_flip_work *work) | |
164 | { | |
8bd4ae20 | 165 | WARN_ON(!list_empty(&work->queued) || !list_empty(&work->commited)); |
cabaafc7 RC |
166 | } |
167 | EXPORT_SYMBOL(drm_flip_work_cleanup); |