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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 | ||
0500c04e SR |
24 | #include <linux/slab.h> |
25 | ||
f9be5f20 | 26 | #include <drm/drm_flip_work.h> |
0500c04e SR |
27 | #include <drm/drm_print.h> |
28 | #include <drm/drm_util.h> | |
cabaafc7 | 29 | |
8bd4ae20 BB |
30 | /** |
31 | * drm_flip_work_allocate_task - allocate a flip-work task | |
32 | * @data: data associated to the task | |
33 | * @flags: allocator flags | |
34 | * | |
35 | * Allocate a drm_flip_task object and attach private data to it. | |
36 | */ | |
37 | struct drm_flip_task *drm_flip_work_allocate_task(void *data, gfp_t flags) | |
38 | { | |
39 | struct drm_flip_task *task; | |
40 | ||
41 | task = kzalloc(sizeof(*task), flags); | |
42 | if (task) | |
43 | task->data = data; | |
44 | ||
45 | return task; | |
46 | } | |
47 | EXPORT_SYMBOL(drm_flip_work_allocate_task); | |
48 | ||
49 | /** | |
50 | * drm_flip_work_queue_task - queue a specific task | |
51 | * @work: the flip-work | |
52 | * @task: the task to handle | |
53 | * | |
54 | * Queues task, that will later be run (passed back to drm_flip_func_t | |
55 | * func) on a work queue after drm_flip_work_commit() is called. | |
56 | */ | |
57 | void drm_flip_work_queue_task(struct drm_flip_work *work, | |
58 | struct drm_flip_task *task) | |
59 | { | |
60 | unsigned long flags; | |
61 | ||
62 | spin_lock_irqsave(&work->lock, flags); | |
63 | list_add_tail(&task->node, &work->queued); | |
64 | spin_unlock_irqrestore(&work->lock, flags); | |
65 | } | |
66 | EXPORT_SYMBOL(drm_flip_work_queue_task); | |
67 | ||
cabaafc7 RC |
68 | /** |
69 | * drm_flip_work_queue - queue work | |
70 | * @work: the flip-work | |
71 | * @val: the value to queue | |
72 | * | |
73 | * Queues work, that will later be run (passed back to drm_flip_func_t | |
74 | * func) on a work queue after drm_flip_work_commit() is called. | |
75 | */ | |
76 | void drm_flip_work_queue(struct drm_flip_work *work, void *val) | |
77 | { | |
8bd4ae20 BB |
78 | struct drm_flip_task *task; |
79 | ||
80 | task = drm_flip_work_allocate_task(val, | |
81 | drm_can_sleep() ? GFP_KERNEL : GFP_ATOMIC); | |
82 | if (task) { | |
83 | drm_flip_work_queue_task(work, task); | |
cabaafc7 | 84 | } else { |
8bd4ae20 | 85 | DRM_ERROR("%s could not allocate task!\n", work->name); |
cabaafc7 RC |
86 | work->func(work, val); |
87 | } | |
88 | } | |
89 | EXPORT_SYMBOL(drm_flip_work_queue); | |
90 | ||
91 | /** | |
92 | * drm_flip_work_commit - commit queued work | |
93 | * @work: the flip-work | |
94 | * @wq: the work-queue to run the queued work on | |
95 | * | |
96 | * Trigger work previously queued by drm_flip_work_queue() to run | |
97 | * on a workqueue. The typical usage would be to queue work (via | |
98 | * drm_flip_work_queue()) at any point (from vblank irq and/or | |
99 | * prior), and then from vblank irq commit the queued work. | |
100 | */ | |
101 | void drm_flip_work_commit(struct drm_flip_work *work, | |
102 | struct workqueue_struct *wq) | |
103 | { | |
8bd4ae20 BB |
104 | unsigned long flags; |
105 | ||
106 | spin_lock_irqsave(&work->lock, flags); | |
107 | list_splice_tail(&work->queued, &work->commited); | |
108 | INIT_LIST_HEAD(&work->queued); | |
109 | spin_unlock_irqrestore(&work->lock, flags); | |
cabaafc7 RC |
110 | queue_work(wq, &work->worker); |
111 | } | |
112 | EXPORT_SYMBOL(drm_flip_work_commit); | |
113 | ||
114 | static void flip_worker(struct work_struct *w) | |
115 | { | |
116 | struct drm_flip_work *work = container_of(w, struct drm_flip_work, worker); | |
8bd4ae20 BB |
117 | struct list_head tasks; |
118 | unsigned long flags; | |
cabaafc7 | 119 | |
8bd4ae20 BB |
120 | while (1) { |
121 | struct drm_flip_task *task, *tmp; | |
cabaafc7 | 122 | |
8bd4ae20 BB |
123 | INIT_LIST_HEAD(&tasks); |
124 | spin_lock_irqsave(&work->lock, flags); | |
125 | list_splice_tail(&work->commited, &tasks); | |
126 | INIT_LIST_HEAD(&work->commited); | |
127 | spin_unlock_irqrestore(&work->lock, flags); | |
128 | ||
129 | if (list_empty(&tasks)) | |
130 | break; | |
131 | ||
132 | list_for_each_entry_safe(task, tmp, &tasks, node) { | |
133 | work->func(work, task->data); | |
134 | kfree(task); | |
135 | } | |
136 | } | |
cabaafc7 RC |
137 | } |
138 | ||
139 | /** | |
140 | * drm_flip_work_init - initialize flip-work | |
141 | * @work: the flip-work to initialize | |
cabaafc7 RC |
142 | * @name: debug name |
143 | * @func: the callback work function | |
144 | * | |
145 | * Initializes/allocates resources for the flip-work | |
cabaafc7 | 146 | */ |
d7f8db53 | 147 | void drm_flip_work_init(struct drm_flip_work *work, |
cabaafc7 RC |
148 | const char *name, drm_flip_func_t func) |
149 | { | |
cabaafc7 | 150 | work->name = name; |
8bd4ae20 BB |
151 | INIT_LIST_HEAD(&work->queued); |
152 | INIT_LIST_HEAD(&work->commited); | |
153 | spin_lock_init(&work->lock); | |
cabaafc7 RC |
154 | work->func = func; |
155 | ||
cabaafc7 | 156 | INIT_WORK(&work->worker, flip_worker); |
cabaafc7 RC |
157 | } |
158 | EXPORT_SYMBOL(drm_flip_work_init); | |
159 | ||
160 | /** | |
161 | * drm_flip_work_cleanup - cleans up flip-work | |
162 | * @work: the flip-work to cleanup | |
163 | * | |
164 | * Destroy resources allocated for the flip-work | |
165 | */ | |
166 | void drm_flip_work_cleanup(struct drm_flip_work *work) | |
167 | { | |
8bd4ae20 | 168 | WARN_ON(!list_empty(&work->queued) || !list_empty(&work->commited)); |
cabaafc7 RC |
169 | } |
170 | EXPORT_SYMBOL(drm_flip_work_cleanup); |