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