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-rw-r--r--drivers/media/video/cx18/cx18-driver.h2
-rw-r--r--drivers/media/video/cx18/cx18-mailbox.c25
-rw-r--r--drivers/media/video/cx18/cx18-queue.c83
-rw-r--r--drivers/media/video/cx18/cx18-streams.c8
4 files changed, 69 insertions, 49 deletions
diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index 62dca432fdbb..35a6758a7aac 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -286,6 +286,7 @@ struct cx18_queue {
struct list_head list;
atomic_t buffers;
u32 bytesused;
+ spinlock_t lock;
};
struct cx18_dvb {
@@ -365,7 +366,6 @@ struct cx18_stream {
unsigned mdl_offset;
u32 id;
- struct mutex qlock; /* locks access to the queues */
unsigned long s_flags; /* status flags, see above */
int dma; /* can be PCI_DMA_TODEVICE,
PCI_DMA_FROMDEVICE or
diff --git a/drivers/media/video/cx18/cx18-mailbox.c b/drivers/media/video/cx18/cx18-mailbox.c
index df7d61d0a13e..afe46c3d4057 100644
--- a/drivers/media/video/cx18/cx18-mailbox.c
+++ b/drivers/media/video/cx18/cx18-mailbox.c
@@ -191,23 +191,24 @@ static void epu_dma_done(struct cx18 *cx, struct cx18_in_work_order *order)
if (buf == NULL) {
CX18_WARN("Could not find buf %d for stream %s\n",
id, s->name);
- /* Put as many buffers as possible back into fw use */
- cx18_stream_load_fw_queue(s);
continue;
}
- if (s->type == CX18_ENC_STREAM_TYPE_TS && s->dvb.enabled) {
- CX18_DEBUG_HI_DMA("TS recv bytesused = %d\n",
- buf->bytesused);
- dvb_dmx_swfilter(&s->dvb.demux, buf->buf,
- buf->bytesused);
+ CX18_DEBUG_HI_DMA("%s recv bytesused = %d\n",
+ s->name, buf->bytesused);
+
+ if (s->type != CX18_ENC_STREAM_TYPE_TS)
+ cx18_enqueue(s, buf, &s->q_full);
+ else {
+ if (s->dvb.enabled)
+ dvb_dmx_swfilter(&s->dvb.demux, buf->buf,
+ buf->bytesused);
+ cx18_enqueue(s, buf, &s->q_free);
}
- /* Put as many buffers as possible back into fw use */
- cx18_stream_load_fw_queue(s);
- /* Put back TS buffer, since it was removed from all queues */
- if (s->type == CX18_ENC_STREAM_TYPE_TS)
- cx18_stream_put_buf_fw(s, buf);
}
+ /* Put as many buffers as possible back into fw use */
+ cx18_stream_load_fw_queue(s);
+
wake_up(&cx->dma_waitq);
if (s->id != -1)
wake_up(&s->waitq);
diff --git a/drivers/media/video/cx18/cx18-queue.c b/drivers/media/video/cx18/cx18-queue.c
index 3046b8e74345..693a745b0858 100644
--- a/drivers/media/video/cx18/cx18-queue.c
+++ b/drivers/media/video/cx18/cx18-queue.c
@@ -53,13 +53,13 @@ struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
buf->skipped = 0;
}
- mutex_lock(&s->qlock);
-
/* q_busy is restricted to a max buffer count imposed by firmware */
if (q == &s->q_busy &&
atomic_read(&q->buffers) >= CX18_MAX_FW_MDLS_PER_STREAM)
q = &s->q_free;
+ spin_lock(&q->lock);
+
if (to_front)
list_add(&buf->list, &q->list); /* LIFO */
else
@@ -67,7 +67,7 @@ struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
q->bytesused += buf->bytesused - buf->readpos;
atomic_inc(&q->buffers);
- mutex_unlock(&s->qlock);
+ spin_unlock(&q->lock);
return q;
}
@@ -75,7 +75,7 @@ struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q)
{
struct cx18_buffer *buf = NULL;
- mutex_lock(&s->qlock);
+ spin_lock(&q->lock);
if (!list_empty(&q->list)) {
buf = list_first_entry(&q->list, struct cx18_buffer, list);
list_del_init(&buf->list);
@@ -83,7 +83,7 @@ struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q)
buf->skipped = 0;
atomic_dec(&q->buffers);
}
- mutex_unlock(&s->qlock);
+ spin_unlock(&q->lock);
return buf;
}
@@ -94,9 +94,23 @@ struct cx18_buffer *cx18_queue_get_buf(struct cx18_stream *s, u32 id,
struct cx18_buffer *buf;
struct cx18_buffer *tmp;
struct cx18_buffer *ret = NULL;
-
- mutex_lock(&s->qlock);
+ LIST_HEAD(sweep_up);
+
+ /*
+ * We don't have to acquire multiple q locks here, because we are
+ * serialized by the single threaded work handler.
+ * Buffers from the firmware will thus remain in order as
+ * they are moved from q_busy to q_full or to the dvb ring buffer.
+ */
+ spin_lock(&s->q_busy.lock);
list_for_each_entry_safe(buf, tmp, &s->q_busy.list, list) {
+ /*
+ * We should find what the firmware told us is done,
+ * right at the front of the queue. If we don't, we likely have
+ * missed a buffer done message from the firmware.
+ * Once we skip a buffer repeatedly, relative to the size of
+ * q_busy, we have high confidence we've missed it.
+ */
if (buf->id != id) {
buf->skipped++;
if (buf->skipped >= atomic_read(&s->q_busy.buffers)-1) {
@@ -105,38 +119,41 @@ struct cx18_buffer *cx18_queue_get_buf(struct cx18_stream *s, u32 id,
"times - it must have dropped out of "
"rotation\n", s->name, buf->id,
buf->skipped);
- /* move it to q_free */
- list_move_tail(&buf->list, &s->q_free.list);
- buf->bytesused = buf->readpos = buf->b_flags =
- buf->skipped = 0;
+ /* Sweep it up to put it back into rotation */
+ list_move_tail(&buf->list, &sweep_up);
atomic_dec(&s->q_busy.buffers);
- atomic_inc(&s->q_free.buffers);
}
continue;
}
-
- buf->bytesused = bytesused;
- /* Sync the buffer before we release the qlock */
- cx18_buf_sync_for_cpu(s, buf);
- if (s->type == CX18_ENC_STREAM_TYPE_TS) {
- /*
- * TS doesn't use q_full. As we pull the buffer off of
- * the queue here, the caller will have to put it back.
- */
- list_del_init(&buf->list);
- } else {
- /* Move buffer from q_busy to q_full */
- list_move_tail(&buf->list, &s->q_full.list);
- set_bit(CX18_F_B_NEED_BUF_SWAP, &buf->b_flags);
- s->q_full.bytesused += buf->bytesused;
- atomic_inc(&s->q_full.buffers);
- }
+ /*
+ * We pull the desired buffer off of the queue here. Something
+ * will have to put it back on a queue later.
+ */
+ list_del_init(&buf->list);
atomic_dec(&s->q_busy.buffers);
-
ret = buf;
break;
}
- mutex_unlock(&s->qlock);
+ spin_unlock(&s->q_busy.lock);
+
+ /*
+ * We found the buffer for which we were looking. Get it ready for
+ * the caller to put on q_full or in the dvb ring buffer.
+ */
+ if (ret != NULL) {
+ ret->bytesused = bytesused;
+ ret->skipped = 0;
+ /* readpos and b_flags were 0'ed when the buf went on q_busy */
+ cx18_buf_sync_for_cpu(s, ret);
+ if (s->type != CX18_ENC_STREAM_TYPE_TS)
+ set_bit(CX18_F_B_NEED_BUF_SWAP, &ret->b_flags);
+ }
+
+ /* Put any buffers the firmware is ignoring back into normal rotation */
+ list_for_each_entry_safe(buf, tmp, &sweep_up, list) {
+ list_del_init(&buf->list);
+ cx18_enqueue(s, buf, &s->q_free);
+ }
return ret;
}
@@ -148,7 +165,7 @@ static void cx18_queue_flush(struct cx18_stream *s, struct cx18_queue *q)
if (q == &s->q_free)
return;
- mutex_lock(&s->qlock);
+ spin_lock(&q->lock);
while (!list_empty(&q->list)) {
buf = list_first_entry(&q->list, struct cx18_buffer, list);
list_move_tail(&buf->list, &s->q_free.list);
@@ -156,7 +173,7 @@ static void cx18_queue_flush(struct cx18_stream *s, struct cx18_queue *q)
atomic_inc(&s->q_free.buffers);
}
cx18_queue_init(q);
- mutex_unlock(&s->qlock);
+ spin_unlock(&q->lock);
}
void cx18_flush_queues(struct cx18_stream *s)
diff --git a/drivers/media/video/cx18/cx18-streams.c b/drivers/media/video/cx18/cx18-streams.c
index bbeb01c5cf32..e1934e9cfdc8 100644
--- a/drivers/media/video/cx18/cx18-streams.c
+++ b/drivers/media/video/cx18/cx18-streams.c
@@ -116,11 +116,13 @@ static void cx18_stream_init(struct cx18 *cx, int type)
s->buffers = cx->stream_buffers[type];
s->buf_size = cx->stream_buf_size[type];
- mutex_init(&s->qlock);
init_waitqueue_head(&s->waitq);
s->id = -1;
+ spin_lock_init(&s->q_free.lock);
cx18_queue_init(&s->q_free);
+ spin_lock_init(&s->q_busy.lock);
cx18_queue_init(&s->q_busy);
+ spin_lock_init(&s->q_full.lock);
cx18_queue_init(&s->q_full);
}
@@ -685,13 +687,13 @@ int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
/* Init all the cpu_mdls for this stream */
cx18_flush_queues(s);
- mutex_lock(&s->qlock);
+ spin_lock(&s->q_free.lock);
list_for_each_entry(buf, &s->q_free.list, list) {
cx18_writel(cx, buf->dma_handle,
&cx->scb->cpu_mdl[buf->id].paddr);
cx18_writel(cx, s->buf_size, &cx->scb->cpu_mdl[buf->id].length);
}
- mutex_unlock(&s->qlock);
+ spin_unlock(&s->q_free.lock);
_cx18_stream_load_fw_queue(s);
/* begin_capture */
generated by cgit v1.2.3 (git 2.0.4) at 2024-07-06 02:33:25 +0000