--- /dev/null
+/*
+ * 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.
+ */
+
+#include "drmP.h"
+#include "drm_flip_work.h"
+
+/**
+ * drm_flip_work_allocate_task - allocate a flip-work task
+ * @data: data associated to the task
+ * @flags: allocator flags
+ *
+ * Allocate a drm_flip_task object and attach private data to it.
+ */
+struct drm_flip_task *drm_flip_work_allocate_task(void *data, gfp_t flags)
+{
+ struct drm_flip_task *task;
+
+ task = kzalloc(sizeof(*task), flags);
+ if (task)
+ task->data = data;
+
+ return task;
+}
+EXPORT_SYMBOL(drm_flip_work_allocate_task);
+
+/**
+ * drm_flip_work_queue_task - queue a specific task
+ * @work: the flip-work
+ * @task: the task to handle
+ *
+ * Queues task, that will later be run (passed back to drm_flip_func_t
+ * func) on a work queue after drm_flip_work_commit() is called.
+ */
+void drm_flip_work_queue_task(struct drm_flip_work *work,
+ struct drm_flip_task *task)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&work->lock, flags);
+ list_add_tail(&task->node, &work->queued);
+ spin_unlock_irqrestore(&work->lock, flags);
+}
+EXPORT_SYMBOL(drm_flip_work_queue_task);
+
+/**
+ * drm_flip_work_queue - queue work
+ * @work: the flip-work
+ * @val: the value to queue
+ *
+ * Queues work, that will later be run (passed back to drm_flip_func_t
+ * func) on a work queue after drm_flip_work_commit() is called.
+ */
+void drm_flip_work_queue(struct drm_flip_work *work, void *val)
+{
+ struct drm_flip_task *task;
+
+ task = drm_flip_work_allocate_task(val,
+ drm_can_sleep() ? GFP_KERNEL : GFP_ATOMIC);
+ if (task) {
+ drm_flip_work_queue_task(work, task);
+ } else {
+ DRM_ERROR("%s could not allocate task!\n", work->name);
+ work->func(work, val);
+ }
+}
+EXPORT_SYMBOL(drm_flip_work_queue);
+
+/**
+ * drm_flip_work_commit - commit queued work
+ * @work: the flip-work
+ * @wq: the work-queue to run the queued work on
+ *
+ * Trigger work previously queued by drm_flip_work_queue() to run
+ * on a workqueue. The typical usage would be to queue work (via
+ * drm_flip_work_queue()) at any point (from vblank irq and/or
+ * prior), and then from vblank irq commit the queued work.
+ */
+void drm_flip_work_commit(struct drm_flip_work *work,
+ struct workqueue_struct *wq)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&work->lock, flags);
+ list_splice_tail(&work->queued, &work->commited);
+ INIT_LIST_HEAD(&work->queued);
+ spin_unlock_irqrestore(&work->lock, flags);
+ queue_work(wq, &work->worker);
+}
+EXPORT_SYMBOL(drm_flip_work_commit);
+
+static void flip_worker(struct work_struct *w)
+{
+ struct drm_flip_work *work = container_of(w, struct drm_flip_work, worker);
+ struct list_head tasks;
+ unsigned long flags;
+
+ while (1) {
+ struct drm_flip_task *task, *tmp;
+
+ INIT_LIST_HEAD(&tasks);
+ spin_lock_irqsave(&work->lock, flags);
+ list_splice_tail(&work->commited, &tasks);
+ INIT_LIST_HEAD(&work->commited);
+ spin_unlock_irqrestore(&work->lock, flags);
+
+ if (list_empty(&tasks))
+ break;
+
+ list_for_each_entry_safe(task, tmp, &tasks, node) {
+ work->func(work, task->data);
+ kfree(task);
+ }
+ }
+}
+
+/**
+ * drm_flip_work_init - initialize flip-work
+ * @work: the flip-work to initialize
+ * @name: debug name
+ * @func: the callback work function
+ *
+ * Initializes/allocates resources for the flip-work
+ */
+void drm_flip_work_init(struct drm_flip_work *work,
+ const char *name, drm_flip_func_t func)
+{
+ work->name = name;
+ INIT_LIST_HEAD(&work->queued);
+ INIT_LIST_HEAD(&work->commited);
+ spin_lock_init(&work->lock);
+ work->func = func;
+
+ INIT_WORK(&work->worker, flip_worker);
+}
+EXPORT_SYMBOL(drm_flip_work_init);
+
+/**
+ * drm_flip_work_cleanup - cleans up flip-work
+ * @work: the flip-work to cleanup
+ *
+ * Destroy resources allocated for the flip-work
+ */
+void drm_flip_work_cleanup(struct drm_flip_work *work)
+{
+ WARN_ON(!list_empty(&work->queued) || !list_empty(&work->commited));
+}
+EXPORT_SYMBOL(drm_flip_work_cleanup);
Code Review / kvmfornfv.git / blobdiff