blob: 35c776ae7d3b438b9e497733426c98ae4df5dec4 [file] [log] [blame]
Rob Clarkcabaafc2013-08-07 14:41:54 -04001/*
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#ifndef DRM_FLIP_WORK_H
25#define DRM_FLIP_WORK_H
26
27#include <linux/kfifo.h>
28#include <linux/workqueue.h>
29
30/**
31 * DOC: flip utils
32 *
33 * Util to queue up work to run from work-queue context after flip/vblank.
34 * Typically this can be used to defer unref of framebuffer's, cursor
35 * bo's, etc until after vblank. The APIs are all safe (and lockless)
36 * for up to one producer and once consumer at a time. The single-consumer
37 * aspect is ensured by committing the queued work to a single work-queue.
38 */
39
40struct drm_flip_work;
41
42/*
43 * drm_flip_func_t - callback function
44 *
45 * @work: the flip work
46 * @val: value queued via drm_flip_work_queue()
47 *
48 * Callback function to be called for each of the queue'd work items after
49 * drm_flip_work_commit() is called.
50 */
51typedef void (*drm_flip_func_t)(struct drm_flip_work *work, void *val);
52
53/**
54 * struct drm_flip_work - flip work queue
55 * @name: debug name
56 * @pending: number of queued but not committed items
57 * @count: number of committed items
58 * @func: callback fxn called for each committed item
59 * @worker: worker which calls @func
60 */
61struct drm_flip_work {
62 const char *name;
63 atomic_t pending, count;
64 drm_flip_func_t func;
65 struct work_struct worker;
66 DECLARE_KFIFO_PTR(fifo, void *);
67};
68
69void drm_flip_work_queue(struct drm_flip_work *work, void *val);
70void drm_flip_work_commit(struct drm_flip_work *work,
71 struct workqueue_struct *wq);
72int drm_flip_work_init(struct drm_flip_work *work, int size,
73 const char *name, drm_flip_func_t func);
74void drm_flip_work_cleanup(struct drm_flip_work *work);
75
76#endif /* DRM_FLIP_WORK_H */