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authorRob Clark <robdclark@gmail.com>2013-08-07 22:41:54 +0400
committerDave Airlie <airlied@redhat.com>2013-08-19 04:32:26 +0400
commitcabaafc78935521c5abc7ec72278dbaa5400c995 (patch)
treec5af38231d7484f421a6abfce09109a0b9d669c7 /drivers/gpu/drm/drm_flip_work.c
parentb17df86ece5e674c6f50b9a219067b9a80ea9dd1 (diff)
downloadlinux-cabaafc78935521c5abc7ec72278dbaa5400c995.tar.xz
drm: add flip-work helper
A small helper to queue up work to do, from workqueue context, after a flip. Typically useful to defer unreffing buffers that may be read by the display controller until vblank. v1: original v2: wire up docbook + couple docbook fixes Signed-off-by: Rob Clark <robdclark@gmail.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_flip_work.c')
-rw-r--r--drivers/gpu/drm/drm_flip_work.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_flip_work.c b/drivers/gpu/drm/drm_flip_work.c
new file mode 100644
index 000000000000..e788882d9021
--- /dev/null
+++ b/drivers/gpu/drm/drm_flip_work.c
@@ -0,0 +1,124 @@
+/*
+ * 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_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)
+{
+ if (kfifo_put(&work->fifo, (const void **)&val)) {
+ atomic_inc(&work->pending);
+ } else {
+ DRM_ERROR("%s fifo full!\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)
+{
+ uint32_t pending = atomic_read(&work->pending);
+ atomic_add(pending, &work->count);
+ atomic_sub(pending, &work->pending);
+ 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);
+ uint32_t count = atomic_read(&work->count);
+ void *val = NULL;
+
+ atomic_sub(count, &work->count);
+
+ while(count--)
+ if (!WARN_ON(!kfifo_get(&work->fifo, &val)))
+ work->func(work, val);
+}
+
+/**
+ * drm_flip_work_init - initialize flip-work
+ * @work: the flip-work to initialize
+ * @size: the max queue depth
+ * @name: debug name
+ * @func: the callback work function
+ *
+ * Initializes/allocates resources for the flip-work
+ *
+ * RETURNS:
+ * Zero on success, error code on failure.
+ */
+int drm_flip_work_init(struct drm_flip_work *work, int size,
+ const char *name, drm_flip_func_t func)
+{
+ int ret;
+
+ work->name = name;
+ atomic_set(&work->count, 0);
+ atomic_set(&work->pending, 0);
+ work->func = func;
+
+ ret = kfifo_alloc(&work->fifo, size, GFP_KERNEL);
+ if (ret) {
+ DRM_ERROR("could not allocate %s fifo\n", name);
+ return ret;
+ }
+
+ INIT_WORK(&work->worker, flip_worker);
+
+ return 0;
+}
+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(!kfifo_is_empty(&work->fifo));
+ kfifo_free(&work->fifo);
+}
+EXPORT_SYMBOL(drm_flip_work_cleanup);