8bd4ae2028
Make use of lists instead of kfifo in order to dynamically allocate task entry when someone require some delayed work, and thus preventing drm_flip_work_queue from directly calling func instead of queuing this call. This allow drm_flip_work_queue to be safely called even within irq handlers. Add new helper functions to allocate a flip work task and queue it when needed. This prevents allocating data within irq context (which might impact the time spent in the irq handler). Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com> Reviewed-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
93 lines
3.0 KiB
C
93 lines
3.0 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/spinlock.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 thread-safe.
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* Moreover, drm_flip_work_queue_task and drm_flip_work_queue can be called
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* in atomic context.
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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_task - flip work task
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* @node: list entry element
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* @data: data to pass to work->func
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*/
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struct drm_flip_task {
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struct list_head node;
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void *data;
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};
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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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* @func: callback fxn called for each committed item
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* @worker: worker which calls @func
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* @queued: queued tasks
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* @commited: commited tasks
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* @lock: lock to access queued and commited lists
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*/
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struct drm_flip_work {
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const char *name;
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drm_flip_func_t func;
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struct work_struct worker;
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struct list_head queued;
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struct list_head commited;
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spinlock_t lock;
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};
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struct drm_flip_task *drm_flip_work_allocate_task(void *data, gfp_t flags);
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void drm_flip_work_queue_task(struct drm_flip_work *work,
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struct drm_flip_task *task);
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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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