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![Sam Ravnborg](/assets/img/avatar_default.png)
Move drm_can_sleep() out of drmP.h to allow users to get rid of the drmP.h include. There was no header file that was a good match for this helper function. So add this to drm_util with the relevant includes. Add include of drm_util.h to all users. v2: - Update comments to use kernel-doc style (Daniel) - Add FIXME to drm_can_sleep and add note that this function should not be used in new code (Daniel) v3: - Fix kernel-doc syntax (Daniel) - Plug drm_util.h into drm-internels.rst (Daniel) Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <maxime.ripard@bootlin.com> Cc: Sean Paul <sean@poorly.run> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: "Christian König" <christian.koenig@amd.com> Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Rob Clark <robdclark@gmail.com> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Cc: Eric Anholt <eric@anholt.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20190112193251.20450-2-sam@ravnborg.org
168 lines
4.8 KiB
C
168 lines
4.8 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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#include <drm/drmP.h>
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#include <drm/drm_util.h>
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#include <drm/drm_flip_work.h>
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/**
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* drm_flip_work_allocate_task - allocate a flip-work task
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* @data: data associated to the task
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* @flags: allocator flags
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*
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* Allocate a drm_flip_task object and attach private data to it.
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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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{
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struct drm_flip_task *task;
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task = kzalloc(sizeof(*task), flags);
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if (task)
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task->data = data;
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return task;
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}
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EXPORT_SYMBOL(drm_flip_work_allocate_task);
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/**
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* drm_flip_work_queue_task - queue a specific task
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* @work: the flip-work
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* @task: the task to handle
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*
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* Queues task, that will later be run (passed back to drm_flip_func_t
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* func) on a work queue after drm_flip_work_commit() is called.
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*/
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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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{
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unsigned long flags;
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spin_lock_irqsave(&work->lock, flags);
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list_add_tail(&task->node, &work->queued);
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spin_unlock_irqrestore(&work->lock, flags);
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}
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EXPORT_SYMBOL(drm_flip_work_queue_task);
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/**
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* drm_flip_work_queue - queue work
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* @work: the flip-work
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* @val: the value to queue
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*
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* Queues work, that will later be run (passed back to drm_flip_func_t
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* func) on a work queue after drm_flip_work_commit() is called.
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*/
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void drm_flip_work_queue(struct drm_flip_work *work, void *val)
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{
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struct drm_flip_task *task;
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task = drm_flip_work_allocate_task(val,
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drm_can_sleep() ? GFP_KERNEL : GFP_ATOMIC);
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if (task) {
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drm_flip_work_queue_task(work, task);
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} else {
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DRM_ERROR("%s could not allocate task!\n", work->name);
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work->func(work, val);
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}
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}
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EXPORT_SYMBOL(drm_flip_work_queue);
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/**
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* drm_flip_work_commit - commit queued work
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* @work: the flip-work
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* @wq: the work-queue to run the queued work on
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*
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* Trigger work previously queued by drm_flip_work_queue() to run
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* on a workqueue. The typical usage would be to queue work (via
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* drm_flip_work_queue()) at any point (from vblank irq and/or
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* prior), and then from vblank irq commit the queued work.
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*/
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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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{
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unsigned long flags;
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spin_lock_irqsave(&work->lock, flags);
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list_splice_tail(&work->queued, &work->commited);
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INIT_LIST_HEAD(&work->queued);
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spin_unlock_irqrestore(&work->lock, flags);
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queue_work(wq, &work->worker);
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}
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EXPORT_SYMBOL(drm_flip_work_commit);
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static void flip_worker(struct work_struct *w)
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{
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struct drm_flip_work *work = container_of(w, struct drm_flip_work, worker);
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struct list_head tasks;
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unsigned long flags;
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while (1) {
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struct drm_flip_task *task, *tmp;
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INIT_LIST_HEAD(&tasks);
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spin_lock_irqsave(&work->lock, flags);
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list_splice_tail(&work->commited, &tasks);
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INIT_LIST_HEAD(&work->commited);
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spin_unlock_irqrestore(&work->lock, flags);
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if (list_empty(&tasks))
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break;
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list_for_each_entry_safe(task, tmp, &tasks, node) {
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work->func(work, task->data);
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kfree(task);
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}
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}
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}
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/**
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* drm_flip_work_init - initialize flip-work
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* @work: the flip-work to initialize
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* @name: debug name
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* @func: the callback work function
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*
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* Initializes/allocates resources for the flip-work
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*/
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void drm_flip_work_init(struct drm_flip_work *work,
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const char *name, drm_flip_func_t func)
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{
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work->name = name;
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INIT_LIST_HEAD(&work->queued);
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INIT_LIST_HEAD(&work->commited);
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spin_lock_init(&work->lock);
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work->func = func;
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INIT_WORK(&work->worker, flip_worker);
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}
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EXPORT_SYMBOL(drm_flip_work_init);
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/**
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* drm_flip_work_cleanup - cleans up flip-work
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* @work: the flip-work to cleanup
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*
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* Destroy resources allocated for the flip-work
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*/
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void drm_flip_work_cleanup(struct drm_flip_work *work)
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{
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WARN_ON(!list_empty(&work->queued) || !list_empty(&work->commited));
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}
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EXPORT_SYMBOL(drm_flip_work_cleanup);
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