include/drm/drm_flip_work.h

   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 #ifndef DRM_FLIP_WORK_H
  25 #define DRM_FLIP_WORK_H
  26
  27 #include <linux/kfifo.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/workqueue.h>
  30
  31 /**
  32  * DOC: flip utils
  33  *
  34  * Util to queue up work to run from work-queue context after flip/vblank.
  35  * Typically this can be used to defer unref of framebuffer's, cursor
  36  * bo's, etc until after vblank.  The APIs are all thread-safe.
  37  * Moreover, drm_flip_work_queue_task and drm_flip_work_queue can be called
  38  * in atomic context.
  39  */
  40
  41 struct drm_flip_work;
  42
  43 /*
  44  * drm_flip_func_t - callback function
  45  *
  46  * @work: the flip work
  47  * @val: value queued via drm_flip_work_queue()
  48  *
  49  * Callback function to be called for each of the  queue'd work items after
  50  * drm_flip_work_commit() is called.
  51  */
  52 typedef void (*drm_flip_func_t)(struct drm_flip_work *work, void *val);
  53
  54 /**
  55  * struct drm_flip_task - flip work task
  56  * @node: list entry element
  57  * @data: data to pass to &drm_flip_work.func
  58  */
  59 struct drm_flip_task {
  60         struct list_head node;
  61         void *data;
  62 };
  63
  64 /**
  65  * struct drm_flip_work - flip work queue
  66  * @name: debug name
  67  * @func: callback fxn called for each committed item
  68  * @worker: worker which calls @func
  69  * @queued: queued tasks
  70  * @commited: commited tasks
  71  * @lock: lock to access queued and commited lists
  72  */
  73 struct drm_flip_work {
  74         const char *name;
  75         drm_flip_func_t func;
  76         struct work_struct worker;
  77         struct list_head queued;
  78         struct list_head commited;
  79         spinlock_t lock;
  80 };
  81
  82 struct drm_flip_task *drm_flip_work_allocate_task(void *data, gfp_t flags);
  83 void drm_flip_work_queue_task(struct drm_flip_work *work,
  84                               struct drm_flip_task *task);
  85 void drm_flip_work_queue(struct drm_flip_work *work, void *val);
  86 void drm_flip_work_commit(struct drm_flip_work *work,
  87                 struct workqueue_struct *wq);
  88 void drm_flip_work_init(struct drm_flip_work *work,
  89                 const char *name, drm_flip_func_t func);
  90 void drm_flip_work_cleanup(struct drm_flip_work *work);
  91
  92 #endif  /* DRM_FLIP_WORK_H */