summaryrefslogtreecommitdiff
path: root/drivers/media/video/cx18/cx18-queue.h
diff options
context:
space:
mode:
authorAndy Walls <awalls@radix.net>2009-11-08 23:45:24 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-12-05 18:41:51 -0200
commit52fcb3ecc6707f52dfe4297f96b7609d4ba517fb (patch)
treefe8ecd66c20b10e8b2ba63c667a6afe78c23a2e1 /drivers/media/video/cx18/cx18-queue.h
parentfa655dda5ce6e5ac4a9b94fd451358edca2ddab8 (diff)
V4L/DVB (13429): cx18: Add Memory Descriptor List (MDL) layer to buffer handling
Add a Memory Descriptor List (MDL) layer to buffer handling to implement scatter-gather I/O. Currently there is still only 1 buffer per MDL. Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/cx18/cx18-queue.h')
-rw-r--r--drivers/media/video/cx18/cx18-queue.h54
1 files changed, 47 insertions, 7 deletions
diff --git a/drivers/media/video/cx18/cx18-queue.h b/drivers/media/video/cx18/cx18-queue.h
index 4de06269d88f..96747e5e7c3c 100644
--- a/drivers/media/video/cx18/cx18-queue.h
+++ b/drivers/media/video/cx18/cx18-queue.h
@@ -33,6 +33,19 @@ static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
s->buf_size, s->dma);
}
+void _cx18_mdl_sync_for_cpu(struct cx18_stream *s, struct cx18_mdl *mdl);
+
+static inline void cx18_mdl_sync_for_cpu(struct cx18_stream *s,
+ struct cx18_mdl *mdl)
+{
+ if (list_is_singular(&mdl->buf_list))
+ cx18_buf_sync_for_cpu(s, list_first_entry(&mdl->buf_list,
+ struct cx18_buffer,
+ list));
+ else
+ _cx18_mdl_sync_for_cpu(s, mdl);
+}
+
static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
struct cx18_buffer *buf)
{
@@ -40,32 +53,59 @@ static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
s->buf_size, s->dma);
}
+void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl);
+
+static inline void cx18_mdl_sync_for_device(struct cx18_stream *s,
+ struct cx18_mdl *mdl)
+{
+ if (list_is_singular(&mdl->buf_list))
+ cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list,
+ struct cx18_buffer,
+ list));
+ else
+ _cx18_mdl_sync_for_device(s, mdl);
+}
+
void cx18_buf_swap(struct cx18_buffer *buf);
+void _cx18_mdl_swap(struct cx18_mdl *mdl);
+
+static inline void cx18_mdl_swap(struct cx18_mdl *mdl)
+{
+ if (list_is_singular(&mdl->buf_list))
+ cx18_buf_swap(list_first_entry(&mdl->buf_list,
+ struct cx18_buffer, list));
+ else
+ _cx18_mdl_swap(mdl);
+}
/* cx18_queue utility functions */
-struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
+struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
struct cx18_queue *q, int to_front);
static inline
-struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
+struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
struct cx18_queue *q)
{
- return _cx18_enqueue(s, buf, q, 0); /* FIFO */
+ return _cx18_enqueue(s, mdl, q, 0); /* FIFO */
}
static inline
-struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_buffer *buf,
+struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl,
struct cx18_queue *q)
{
- return _cx18_enqueue(s, buf, q, 1); /* LIFO */
+ return _cx18_enqueue(s, mdl, q, 1); /* LIFO */
}
void cx18_queue_init(struct cx18_queue *q);
-struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
-struct cx18_buffer *cx18_queue_get_buf(struct cx18_stream *s, u32 id,
+struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
+struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
u32 bytesused);
void cx18_flush_queues(struct cx18_stream *s);
+/* queue MDL reconfiguration helpers */
+void cx18_unload_queues(struct cx18_stream *s);
+void cx18_load_queues(struct cx18_stream *s);
+
/* cx18_stream utility functions */
int cx18_stream_alloc(struct cx18_stream *s);
void cx18_stream_free(struct cx18_stream *s);