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path: root/drivers/media/video/cx18/cx18-queue.c
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Diffstat (limited to 'drivers/media/video/cx18/cx18-queue.c')
-rw-r--r--drivers/media/video/cx18/cx18-queue.c129
1 files changed, 32 insertions, 97 deletions
diff --git a/drivers/media/video/cx18/cx18-queue.c b/drivers/media/video/cx18/cx18-queue.c
index 6990b77c620..dbe792ac300 100644
--- a/drivers/media/video/cx18/cx18-queue.c
+++ b/drivers/media/video/cx18/cx18-queue.c
@@ -78,12 +78,13 @@ struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q)
return buf;
}
-struct cx18_buffer *cx18_queue_find_buf(struct cx18_stream *s, u32 id,
+struct cx18_buffer *cx18_queue_get_buf_irq(struct cx18_stream *s, u32 id,
u32 bytesused)
{
struct cx18 *cx = s->cx;
struct list_head *p;
+ spin_lock(&s->qlock);
list_for_each(p, &s->q_free.list) {
struct cx18_buffer *buf =
list_entry(p, struct cx18_buffer, list);
@@ -92,114 +93,48 @@ struct cx18_buffer *cx18_queue_find_buf(struct cx18_stream *s, u32 id,
continue;
buf->bytesused = bytesused;
/* the transport buffers are handled differently,
- so there is no need to move them to the full queue */
- if (s->type == CX18_ENC_STREAM_TYPE_TS)
- return buf;
- s->q_free.buffers--;
- s->q_free.length -= s->buf_size;
- s->q_full.buffers++;
- s->q_full.length += s->buf_size;
- s->q_full.bytesused += buf->bytesused;
- list_move_tail(&buf->list, &s->q_full.list);
+ they are not moved to the full queue */
+ if (s->type != CX18_ENC_STREAM_TYPE_TS) {
+ s->q_free.buffers--;
+ s->q_free.length -= s->buf_size;
+ s->q_full.buffers++;
+ s->q_full.length += s->buf_size;
+ s->q_full.bytesused += buf->bytesused;
+ list_move_tail(&buf->list, &s->q_full.list);
+ }
+ spin_unlock(&s->qlock);
return buf;
}
+ spin_unlock(&s->qlock);
CX18_ERR("Cannot find buffer %d for stream %s\n", id, s->name);
return NULL;
}
-static void cx18_queue_move_buf(struct cx18_stream *s, struct cx18_queue *from,
- struct cx18_queue *to, int clear, int full)
-{
- struct cx18_buffer *buf =
- list_entry(from->list.next, struct cx18_buffer, list);
-
- list_move_tail(from->list.next, &to->list);
- from->buffers--;
- from->length -= s->buf_size;
- from->bytesused -= buf->bytesused - buf->readpos;
- /* special handling for q_free */
- if (clear)
- buf->bytesused = buf->readpos = buf->b_flags = 0;
- else if (full) {
- /* special handling for stolen buffers, assume
- all bytes are used. */
- buf->bytesused = s->buf_size;
- buf->readpos = buf->b_flags = 0;
- }
- to->buffers++;
- to->length += s->buf_size;
- to->bytesused += buf->bytesused - buf->readpos;
-}
-
-/* Move 'needed_bytes' worth of buffers from queue 'from' into queue 'to'.
- If 'needed_bytes' == 0, then move all buffers from 'from' into 'to'.
- If 'steal' != NULL, then buffers may also taken from that queue if
- needed.
-
- The buffer is automatically cleared if it goes to the free queue. It is
- also cleared if buffers need to be taken from the 'steal' queue and
- the 'from' queue is the free queue.
-
- When 'from' is q_free, then needed_bytes is compared to the total
- available buffer length, otherwise needed_bytes is compared to the
- bytesused value. For the 'steal' queue the total available buffer
- length is always used.
-
- -ENOMEM is returned if the buffers could not be obtained, 0 if all
- buffers where obtained from the 'from' list and if non-zero then
- the number of stolen buffers is returned. */
-static int cx18_queue_move(struct cx18_stream *s, struct cx18_queue *from,
- struct cx18_queue *steal, struct cx18_queue *to,
- int needed_bytes)
+/* Move all buffers of a queue to q_free, while flushing the buffers */
+static void cx18_queue_flush(struct cx18_stream *s, struct cx18_queue *q)
{
unsigned long flags;
- int rc = 0;
- int from_free = from == &s->q_free;
- int to_free = to == &s->q_free;
- int bytes_available;
-
- spin_lock_irqsave(&s->qlock, flags);
- if (needed_bytes == 0) {
- from_free = 1;
- needed_bytes = from->length;
- }
-
- bytes_available = from_free ? from->length : from->bytesused;
- bytes_available += steal ? steal->length : 0;
+ struct cx18_buffer *buf;
- if (bytes_available < needed_bytes) {
- spin_unlock_irqrestore(&s->qlock, flags);
- return -ENOMEM;
- }
- if (from_free) {
- u32 old_length = to->length;
+ if (q == &s->q_free)
+ return;
- while (to->length - old_length < needed_bytes) {
- if (list_empty(&from->list))
- from = steal;
- if (from == steal)
- rc++; /* keep track of 'stolen' buffers */
- cx18_queue_move_buf(s, from, to, 1, 0);
- }
- } else {
- u32 old_bytesused = to->bytesused;
-
- while (to->bytesused - old_bytesused < needed_bytes) {
- if (list_empty(&from->list))
- from = steal;
- if (from == steal)
- rc++; /* keep track of 'stolen' buffers */
- cx18_queue_move_buf(s, from, to, to_free, rc);
- }
+ spin_lock_irqsave(&s->qlock, flags);
+ while (!list_empty(&q->list)) {
+ buf = list_entry(q->list.next, struct cx18_buffer, list);
+ list_move_tail(q->list.next, &s->q_free.list);
+ buf->bytesused = buf->readpos = buf->b_flags = 0;
+ s->q_free.buffers++;
+ s->q_free.length += s->buf_size;
}
+ cx18_queue_init(q);
spin_unlock_irqrestore(&s->qlock, flags);
- return rc;
}
void cx18_flush_queues(struct cx18_stream *s)
{
- cx18_queue_move(s, &s->q_io, NULL, &s->q_free, 0);
- cx18_queue_move(s, &s->q_full, NULL, &s->q_free, 0);
+ cx18_queue_flush(s, &s->q_io);
+ cx18_queue_flush(s, &s->q_full);
}
int cx18_stream_alloc(struct cx18_stream *s)
@@ -214,10 +149,10 @@ int cx18_stream_alloc(struct cx18_stream *s)
s->name, s->buffers, s->buf_size,
s->buffers * s->buf_size / 1024);
- if (((char *)&cx->scb->cpu_mdl[cx->mdl_offset + s->buffers] -
- (char *)cx->scb) > SCB_RESERVED_SIZE) {
- unsigned bufsz = (((char *)cx->scb) + SCB_RESERVED_SIZE -
- ((char *)cx->scb->cpu_mdl));
+ if (((char __iomem *)&cx->scb->cpu_mdl[cx->mdl_offset + s->buffers] -
+ (char __iomem *)cx->scb) > SCB_RESERVED_SIZE) {
+ unsigned bufsz = (((char __iomem *)cx->scb) + SCB_RESERVED_SIZE -
+ ((char __iomem *)cx->scb->cpu_mdl));
CX18_ERR("Too many buffers, cannot fit in SCB area\n");
CX18_ERR("Max buffers = %zd\n",