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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 <drm/drmP.h>
25#include <drm/drm_flip_work.h>
26
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 */
34struct 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}
44EXPORT_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 */
54void 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}
63EXPORT_SYMBOL(drm_flip_work_queue_task);
64
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 */
73void drm_flip_work_queue(struct drm_flip_work *work, void *val)
74{
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);
81 } else {
82 DRM_ERROR("%s could not allocate task!\n", work->name);
83 work->func(work, val);
84 }
85}
86EXPORT_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 */
98void drm_flip_work_commit(struct drm_flip_work *work,
99 struct workqueue_struct *wq)
100{
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);
107 queue_work(wq, &work->worker);
108}
109EXPORT_SYMBOL(drm_flip_work_commit);
110
111static void flip_worker(struct work_struct *w)
112{
113 struct drm_flip_work *work = container_of(w, struct drm_flip_work, worker);
114 struct list_head tasks;
115 unsigned long flags;
116
117 while (1) {
118 struct drm_flip_task *task, *tmp;
119
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 }
134}
135
136/**
137 * drm_flip_work_init - initialize flip-work
138 * @work: the flip-work to initialize
139 * @name: debug name
140 * @func: the callback work function
141 *
142 * Initializes/allocates resources for the flip-work
143 */
144void drm_flip_work_init(struct drm_flip_work *work,
145 const char *name, drm_flip_func_t func)
146{
147 work->name = name;
148 INIT_LIST_HEAD(&work->queued);
149 INIT_LIST_HEAD(&work->commited);
150 spin_lock_init(&work->lock);
151 work->func = func;
152
153 INIT_WORK(&work->worker, flip_worker);
154}
155EXPORT_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 */
163void drm_flip_work_cleanup(struct drm_flip_work *work)
164{
165 WARN_ON(!list_empty(&work->queued) || !list_empty(&work->commited));
166}
167EXPORT_SYMBOL(drm_flip_work_cleanup);
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 */
35void drm_flip_work_queue(struct drm_flip_work *work, void *val)
36{
37 if (kfifo_put(&work->fifo, val)) {
38 atomic_inc(&work->pending);
39 } else {
40 DRM_ERROR("%s fifo full!\n", work->name);
41 work->func(work, val);
42 }
43}
44EXPORT_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 */
56void 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}
64EXPORT_SYMBOL(drm_flip_work_commit);
65
66static 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 */
91int 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}
111EXPORT_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 */
119void drm_flip_work_cleanup(struct drm_flip_work *work)
120{
121 WARN_ON(!kfifo_is_empty(&work->fifo));
122 kfifo_free(&work->fifo);
123}
124EXPORT_SYMBOL(drm_flip_work_cleanup);