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/*
* Copyright (C) 2013 Red Hat
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef DRM_FLIP_WORK_H
#define DRM_FLIP_WORK_H
#include <linux/kfifo.h>
#include <linux/workqueue.h>
/**
* DOC: flip utils
*
* Util to queue up work to run from work-queue context after flip/vblank.
* Typically this can be used to defer unref of framebuffer's, cursor
* bo's, etc until after vblank. The APIs are all safe (and lockless)
* for up to one producer and once consumer at a time. The single-consumer
* aspect is ensured by committing the queued work to a single work-queue.
*/
struct drm_flip_work;
/*
* drm_flip_func_t - callback function
*
* @work: the flip work
* @val: value queued via drm_flip_work_queue()
*
* Callback function to be called for each of the queue'd work items after
* drm_flip_work_commit() is called.
*/
typedef void (*drm_flip_func_t)(struct drm_flip_work *work, void *val);
/**
* struct drm_flip_work - flip work queue
* @name: debug name
* @pending: number of queued but not committed items
* @count: number of committed items
* @func: callback fxn called for each committed item
* @worker: worker which calls @func
* @fifo: queue of committed items
*/
struct drm_flip_work {
const char *name;
atomic_t pending, count;
drm_flip_func_t func;
struct work_struct worker;
DECLARE_KFIFO_PTR(fifo, void *);
};
void drm_flip_work_queue(struct drm_flip_work *work, void *val);
void drm_flip_work_commit(struct drm_flip_work *work,
struct workqueue_struct *wq);
int drm_flip_work_init(struct drm_flip_work *work, int size,
const char *name, drm_flip_func_t func);
void drm_flip_work_cleanup(struct drm_flip_work *work);
#endif /* DRM_FLIP_WORK_H */
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