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Diffstat (limited to 'drivers/media/video/ivtv/ivtv-queue.c')
-rw-r--r--drivers/media/video/ivtv/ivtv-queue.c297
1 files changed, 0 insertions, 297 deletions
diff --git a/drivers/media/video/ivtv/ivtv-queue.c b/drivers/media/video/ivtv/ivtv-queue.c
deleted file mode 100644
index 7fde36e6d22..00000000000
--- a/drivers/media/video/ivtv/ivtv-queue.c
+++ /dev/null
@@ -1,297 +0,0 @@
-/*
- buffer queues.
- Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
- Copyright (C) 2004 Chris Kennedy <c@groovy.org>
- Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
-
- 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
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include "ivtv-driver.h"
-#include "ivtv-queue.h"
-
-int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes)
-{
- if (s->buf_size - buf->bytesused < copybytes)
- copybytes = s->buf_size - buf->bytesused;
- if (copy_from_user(buf->buf + buf->bytesused, src, copybytes)) {
- return -EFAULT;
- }
- buf->bytesused += copybytes;
- return copybytes;
-}
-
-void ivtv_buf_swap(struct ivtv_buffer *buf)
-{
- int i;
-
- for (i = 0; i < buf->bytesused; i += 4)
- swab32s((u32 *)(buf->buf + i));
-}
-
-void ivtv_queue_init(struct ivtv_queue *q)
-{
- INIT_LIST_HEAD(&q->list);
- q->buffers = 0;
- q->length = 0;
- q->bytesused = 0;
-}
-
-void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q)
-{
- unsigned long flags;
-
- /* 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->dma_xfer_cnt = 0;
- }
- spin_lock_irqsave(&s->qlock, flags);
- list_add_tail(&buf->list, &q->list);
- q->buffers++;
- q->length += s->buf_size;
- q->bytesused += buf->bytesused - buf->readpos;
- spin_unlock_irqrestore(&s->qlock, flags);
-}
-
-struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q)
-{
- struct ivtv_buffer *buf = NULL;
- unsigned long flags;
-
- spin_lock_irqsave(&s->qlock, flags);
- if (!list_empty(&q->list)) {
- buf = list_entry(q->list.next, struct ivtv_buffer, list);
- list_del_init(q->list.next);
- q->buffers--;
- q->length -= s->buf_size;
- q->bytesused -= buf->bytesused - buf->readpos;
- }
- spin_unlock_irqrestore(&s->qlock, flags);
- return buf;
-}
-
-static void ivtv_queue_move_buf(struct ivtv_stream *s, struct ivtv_queue *from,
- struct ivtv_queue *to, int clear)
-{
- struct ivtv_buffer *buf = list_entry(from->list.next, struct ivtv_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 = buf->dma_xfer_cnt = 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, but only if 'from' is the free queue.
-
- 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. */
-int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
- struct ivtv_queue *to, int needed_bytes)
-{
- unsigned long flags;
- int rc = 0;
- int from_free = from == &s->q_free;
- int to_free = to == &s->q_free;
- int bytes_available, bytes_steal;
-
- 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_steal = (from_free && steal) ? steal->length : 0;
-
- if (bytes_available + bytes_steal < needed_bytes) {
- spin_unlock_irqrestore(&s->qlock, flags);
- return -ENOMEM;
- }
- while (bytes_available < needed_bytes) {
- struct ivtv_buffer *buf = list_entry(steal->list.prev, struct ivtv_buffer, list);
- u16 dma_xfer_cnt = buf->dma_xfer_cnt;
-
- /* move buffers from the tail of the 'steal' queue to the tail of the
- 'from' queue. Always copy all the buffers with the same dma_xfer_cnt
- value, this ensures that you do not end up with partial frame data
- if one frame is stored in multiple buffers. */
- while (dma_xfer_cnt == buf->dma_xfer_cnt) {
- list_move_tail(steal->list.prev, &from->list);
- rc++;
- steal->buffers--;
- steal->length -= s->buf_size;
- steal->bytesused -= buf->bytesused - buf->readpos;
- buf->bytesused = buf->readpos = buf->b_flags = buf->dma_xfer_cnt = 0;
- from->buffers++;
- from->length += s->buf_size;
- bytes_available += s->buf_size;
- if (list_empty(&steal->list))
- break;
- buf = list_entry(steal->list.prev, struct ivtv_buffer, list);
- }
- }
- if (from_free) {
- u32 old_length = to->length;
-
- while (to->length - old_length < needed_bytes) {
- ivtv_queue_move_buf(s, from, to, 1);
- }
- }
- else {
- u32 old_bytesused = to->bytesused;
-
- while (to->bytesused - old_bytesused < needed_bytes) {
- ivtv_queue_move_buf(s, from, to, to_free);
- }
- }
- spin_unlock_irqrestore(&s->qlock, flags);
- return rc;
-}
-
-void ivtv_flush_queues(struct ivtv_stream *s)
-{
- ivtv_queue_move(s, &s->q_io, NULL, &s->q_free, 0);
- ivtv_queue_move(s, &s->q_full, NULL, &s->q_free, 0);
- ivtv_queue_move(s, &s->q_dma, NULL, &s->q_free, 0);
- ivtv_queue_move(s, &s->q_predma, NULL, &s->q_free, 0);
-}
-
-int ivtv_stream_alloc(struct ivtv_stream *s)
-{
- struct ivtv *itv = s->itv;
- int SGsize = sizeof(struct ivtv_sg_host_element) * s->buffers;
- int i;
-
- if (s->buffers == 0)
- return 0;
-
- IVTV_DEBUG_INFO("Allocate %s%s stream: %d x %d buffers (%dkB total)\n",
- s->dma != PCI_DMA_NONE ? "DMA " : "",
- s->name, s->buffers, s->buf_size, s->buffers * s->buf_size / 1024);
-
- s->sg_pending = kzalloc(SGsize, GFP_KERNEL|__GFP_NOWARN);
- if (s->sg_pending == NULL) {
- IVTV_ERR("Could not allocate sg_pending for %s stream\n", s->name);
- return -ENOMEM;
- }
- s->sg_pending_size = 0;
-
- s->sg_processing = kzalloc(SGsize, GFP_KERNEL|__GFP_NOWARN);
- if (s->sg_processing == NULL) {
- IVTV_ERR("Could not allocate sg_processing for %s stream\n", s->name);
- kfree(s->sg_pending);
- s->sg_pending = NULL;
- return -ENOMEM;
- }
- s->sg_processing_size = 0;
-
- s->sg_dma = kzalloc(sizeof(struct ivtv_sg_element),
- GFP_KERNEL|__GFP_NOWARN);
- if (s->sg_dma == NULL) {
- IVTV_ERR("Could not allocate sg_dma for %s stream\n", s->name);
- kfree(s->sg_pending);
- s->sg_pending = NULL;
- kfree(s->sg_processing);
- s->sg_processing = NULL;
- return -ENOMEM;
- }
- if (ivtv_might_use_dma(s)) {
- s->sg_handle = pci_map_single(itv->pdev, s->sg_dma,
- sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
- ivtv_stream_sync_for_cpu(s);
- }
-
- /* allocate stream buffers. Initially all buffers are in q_free. */
- for (i = 0; i < s->buffers; i++) {
- struct ivtv_buffer *buf = kzalloc(sizeof(struct ivtv_buffer),
- GFP_KERNEL|__GFP_NOWARN);
-
- if (buf == NULL)
- break;
- buf->buf = kmalloc(s->buf_size + 256, GFP_KERNEL|__GFP_NOWARN);
- if (buf->buf == NULL) {
- kfree(buf);
- break;
- }
- INIT_LIST_HEAD(&buf->list);
- if (ivtv_might_use_dma(s)) {
- buf->dma_handle = pci_map_single(s->itv->pdev,
- buf->buf, s->buf_size + 256, s->dma);
- ivtv_buf_sync_for_cpu(s, buf);
- }
- ivtv_enqueue(s, buf, &s->q_free);
- }
- if (i == s->buffers)
- return 0;
- IVTV_ERR("Couldn't allocate buffers for %s stream\n", s->name);
- ivtv_stream_free(s);
- return -ENOMEM;
-}
-
-void ivtv_stream_free(struct ivtv_stream *s)
-{
- struct ivtv_buffer *buf;
-
- /* move all buffers to q_free */
- ivtv_flush_queues(s);
-
- /* empty q_free */
- while ((buf = ivtv_dequeue(s, &s->q_free))) {
- if (ivtv_might_use_dma(s))
- pci_unmap_single(s->itv->pdev, buf->dma_handle,
- s->buf_size + 256, s->dma);
- kfree(buf->buf);
- kfree(buf);
- }
-
- /* Free SG Array/Lists */
- if (s->sg_dma != NULL) {
- if (s->sg_handle != IVTV_DMA_UNMAPPED) {
- pci_unmap_single(s->itv->pdev, s->sg_handle,
- sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
- s->sg_handle = IVTV_DMA_UNMAPPED;
- }
- kfree(s->sg_pending);
- kfree(s->sg_processing);
- kfree(s->sg_dma);
- s->sg_pending = NULL;
- s->sg_processing = NULL;
- s->sg_dma = NULL;
- s->sg_pending_size = 0;
- s->sg_processing_size = 0;
- }
-}
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