* Derived from ivtv-queue.c
*
* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
+ * Copyright (C) 2008 Andy Walls <awalls@radix.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
q->bytesused = 0;
}
-void cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
- struct cx18_queue *q)
+void _cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
+ struct cx18_queue *q, int to_front)
{
- unsigned long flags = 0;
-
/* clear the buffer if it is going to be enqueued to the free queue */
if (q == &s->q_free) {
buf->bytesused = 0;
buf->readpos = 0;
buf->b_flags = 0;
+ buf->skipped = 0;
}
- spin_lock_irqsave(&s->qlock, flags);
- list_add_tail(&buf->list, &q->list);
+ mutex_lock(&s->qlock);
+ if (to_front)
+ list_add(&buf->list, &q->list); /* LIFO */
+ else
+ list_add_tail(&buf->list, &q->list); /* FIFO */
atomic_inc(&q->buffers);
q->bytesused += buf->bytesused - buf->readpos;
- spin_unlock_irqrestore(&s->qlock, flags);
+ mutex_unlock(&s->qlock);
}
struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q)
{
struct cx18_buffer *buf = NULL;
- unsigned long flags = 0;
- spin_lock_irqsave(&s->qlock, flags);
+ mutex_lock(&s->qlock);
if (!list_empty(&q->list)) {
buf = list_entry(q->list.next, struct cx18_buffer, list);
list_del_init(q->list.next);
atomic_dec(&q->buffers);
q->bytesused -= buf->bytesused - buf->readpos;
+ buf->skipped = 0;
}
- spin_unlock_irqrestore(&s->qlock, flags);
+ mutex_unlock(&s->qlock);
return buf;
}
-struct cx18_buffer *cx18_queue_get_buf_irq(struct cx18_stream *s, u32 id,
+struct cx18_buffer *cx18_queue_get_buf(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);
-
- if (buf->id != id)
+ struct cx18_buffer *buf;
+ struct cx18_buffer *ret = NULL;
+ struct list_head *p, *t;
+ LIST_HEAD(r);
+
+ mutex_lock(&s->qlock);
+ list_for_each_safe(p, t, &s->q_free.list) {
+ buf = list_entry(p, struct cx18_buffer, list);
+
+ if (buf->id != id) {
+ buf->skipped++;
+ if (buf->skipped >= atomic_read(&s->q_free.buffers)-1) {
+ /* buffer must have fallen out of rotation */
+ atomic_dec(&s->q_free.buffers);
+ list_move_tail(&buf->list, &r);
+ CX18_WARN("Skipped %s, buffer %d, %d "
+ "times - it must have dropped out of "
+ "rotation\n", s->name, buf->id,
+ buf->skipped);
+ }
continue;
+ }
+
buf->bytesused = bytesused;
- /* the transport buffers are handled differently,
- they are not moved to the full queue */
- if (s->type != CX18_ENC_STREAM_TYPE_TS) {
- atomic_dec(&s->q_free.buffers);
+ atomic_dec(&s->q_free.buffers);
+ if (s->type == CX18_ENC_STREAM_TYPE_TS) {
+ /*
+ * TS doesn't use q_full, but for sweeping up lost
+ * buffers, we want the TS to requeue the buffer just
+ * before sending the MDL back to the firmware, so we
+ * pull it off the list here.
+ */
+ list_del_init(&buf->list);
+ } else {
atomic_inc(&s->q_full.buffers);
s->q_full.bytesused += buf->bytesused;
list_move_tail(&buf->list, &s->q_full.list);
}
- spin_unlock(&s->qlock);
- return buf;
+
+ ret = buf;
+ break;
+ }
+ mutex_unlock(&s->qlock);
+
+ /* Put lost buffers back into firmware transfer rotation */
+ while (!list_empty(&r)) {
+ buf = list_entry(r.next, struct cx18_buffer, list);
+ list_del_init(r.next);
+ cx18_enqueue(s, buf, &s->q_free);
+ cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5, s->handle,
+ (void __iomem *)&cx->scb->cpu_mdl[buf->id] - cx->enc_mem,
+ 1, buf->id, s->buf_size);
+ CX18_INFO("Returning %s, buffer %d back to transfer rotation\n",
+ s->name, buf->id);
+ /* and there was much rejoicing... */
}
- spin_unlock(&s->qlock);
- CX18_ERR("Cannot find buffer %d for stream %s\n", id, s->name);
- return NULL;
+ return ret;
}
/* 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;
struct cx18_buffer *buf;
if (q == &s->q_free)
return;
- spin_lock_irqsave(&s->qlock, flags);
+ mutex_lock(&s->qlock);
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;
+ buf->bytesused = buf->readpos = buf->b_flags = buf->skipped = 0;
atomic_inc(&s->q_free.buffers);
}
cx18_queue_init(q);
- spin_unlock_irqrestore(&s->qlock, flags);
+ mutex_unlock(&s->qlock);
}
void cx18_flush_queues(struct cx18_stream *s)
{
- cx18_queue_flush(s, &s->q_io);
cx18_queue_flush(s, &s->q_full);
}
projects / linux-2.6-omap-h63xx.git / blobdiff