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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-driver.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-driver.h')
-rw-r--r--drivers/media/video/cx18/cx18-driver.h45
1 files changed, 31 insertions, 14 deletions
diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index 1a899e0773d7..bed8bcc65411 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -246,8 +246,8 @@ struct cx18_options {
int radio; /* enable/disable radio */
};
-/* per-buffer bit flags */
-#define CX18_F_B_NEED_BUF_SWAP 0 /* this buffer should be byte swapped */
+/* per-mdl bit flags */
+#define CX18_F_M_NEED_SWAP 0 /* mdl buffer data must be endianess swapped */
/* per-stream, s_flags */
#define CX18_F_S_CLAIMED 3 /* this stream is claimed */
@@ -274,15 +274,26 @@ struct cx18_options {
struct cx18_buffer {
struct list_head list;
dma_addr_t dma_handle;
- u32 id;
- unsigned long b_flags;
- unsigned skipped;
char *buf;
u32 bytesused;
u32 readpos;
};
+struct cx18_mdl {
+ struct list_head list;
+ u32 id; /* index into cx->scb->cpu_mdl[] of 1st cx18_mdl_ent */
+
+ unsigned int skipped;
+ unsigned long m_flags;
+
+ struct list_head buf_list;
+ struct cx18_buffer *curr_buf; /* current buffer in list for reading */
+
+ u32 bytesused;
+ u32 readpos;
+};
+
struct cx18_queue {
struct list_head list;
atomic_t depth;
@@ -346,14 +357,20 @@ struct cx18_stream {
PCI_DMA_NONE */
wait_queue_head_t waitq;
- /* Buffer Stats */
- u32 buffers;
- u32 buf_size;
+ /* Buffers */
+ struct list_head buf_pool; /* buffers not attached to an MDL */
+ u32 buffers; /* total buffers owned by this stream */
+ u32 buf_size; /* size in bytes of a single buffer */
+
+ /* MDL sizes - all stream MDLs are the same size */
+ u32 bufs_per_mdl;
+ u32 mdl_size; /* total bytes in all buffers in a mdl */
- /* Buffer Queues */
- struct cx18_queue q_free; /* free buffers */
- struct cx18_queue q_busy; /* busy buffers - in use by firmware */
- struct cx18_queue q_full; /* full buffers - data for user apps */
+ /* MDL Queues */
+ struct cx18_queue q_free; /* free - in rotation, not committed */
+ struct cx18_queue q_busy; /* busy - in use by firmware */
+ struct cx18_queue q_full; /* full - data for user apps */
+ struct cx18_queue q_idle; /* idle - not in rotation */
struct work_struct out_work_order;
@@ -481,10 +498,11 @@ struct vbi_info {
u32 inserted_frame;
/*
- * A dummy driver stream transfer buffer with a copy of the next
+ * A dummy driver stream transfer mdl & buffer with a copy of the next
* sliced_mpeg_data[] buffer for output to userland apps.
* Only used in cx18-fileops.c, but its state needs to persist at times.
*/
+ struct cx18_mdl sliced_mpeg_mdl;
struct cx18_buffer sliced_mpeg_buf;
};
@@ -511,7 +529,6 @@ struct cx18 {
u8 is_60hz;
u8 nof_inputs; /* number of video inputs */
u8 nof_audio_inputs; /* number of audio inputs */
- u16 buffer_id; /* buffer ID counter */
u32 v4l2_cap; /* V4L2 capabilities of card */
u32 hw_flags; /* Hardware description of the board */
unsigned int free_mdl_idx;