renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-17 01:34:00 +08:00
Code

V4L/DVB (3501): Dmxdev: use dvb_ringbuffer

Browse Source 
Use dvb_ringbuffer instead of an own buffer implementation in
dmxdev.[ch].

Signed-off-by: Andreas Oberritter <obi@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Andreas Oberritter 2006-03-14 17:31:01 -03:00 committed by Linus Torvalds
parent 4304954eb6
commit 34731df288
2 changed files with 63 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

158
drivers/media/dvb/dvb-core/dmxdev.c
View File

@ -40,110 +40,72 @@ MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
#define dprintk if (debug) printk
static inline void dvb_dmxdev_buffer_init(struct dmxdev_buffer *buffer)
static int dvb_dmxdev_buffer_write(struct dvb_ringbuffer *buf,
const u8 *src, size_t len)
{
buffer->data = NULL;
buffer->size = 8192;
buffer->pread = 0;
buffer->pwrite = 0;
buffer->error = 0;
init_waitqueue_head(&buffer->queue);
}
static inline int dvb_dmxdev_buffer_write(struct dmxdev_buffer *buf,
const u8 *src, int len)
{
int split;
int free;
int todo;
ssize_t free;
if (!len)
return 0;
if (!buf->data)
return 0;
free = buf->pread - buf->pwrite;
split = 0;
if (free <= 0) {
free += buf->size;
split = buf->size - buf->pwrite;
}
if (len >= free) {
free = dvb_ringbuffer_free(buf);
if (len > free) {
dprintk("dmxdev: buffer overflow\n");
return -1;
return -EOVERFLOW;
}
if (split >= len)
split = 0;
todo = len;
if (split) {
memcpy(buf->data + buf->pwrite, src, split);
todo -= split;
buf->pwrite = 0;
}
memcpy(buf->data + buf->pwrite, src + split, todo);
buf->pwrite = (buf->pwrite + todo) % buf->size;
return len;
return dvb_ringbuffer_write(buf, src, len);
}
static ssize_t dvb_dmxdev_buffer_read(struct dmxdev_buffer *src,
static ssize_t dvb_dmxdev_buffer_read(struct dvb_ringbuffer *src,
int non_blocking, char __user *buf,
size_t count, loff_t *ppos)
{
unsigned long todo = count;
int split, avail, error;
size_t todo;
ssize_t avail;
ssize_t ret = 0;
if (!src->data)
return 0;
if ((error = src->error)) {
src->pwrite = src->pread;
src->error = 0;
return error;
if (src->error) {
ret = src->error;
dvb_ringbuffer_flush(src);
return ret;
}
if (non_blocking && (src->pwrite == src->pread))
return -EWOULDBLOCK;
while (todo > 0) {
if (non_blocking && (src->pwrite == src->pread))
return (count - todo) ? (count - todo) : -EWOULDBLOCK;
if (wait_event_interruptible(src->queue,
(src->pread != src->pwrite) ||
(src->error)) < 0)
return count - todo;
if ((error = src->error)) {
src->pwrite = src->pread;
src->error = 0;
return error;
for (todo = count; todo > 0; todo -= ret) {
if (non_blocking && dvb_ringbuffer_empty(src)) {
ret = -EWOULDBLOCK;
break;
}
split = src->size;
avail = src->pwrite - src->pread;
if (avail < 0) {
avail += src->size;
split = src->size - src->pread;
ret = wait_event_interruptible(src->queue,
!dvb_ringbuffer_empty(src) ||
(src->error != 0));
if (ret < 0)
break;
if (src->error) {
ret = src->error;
dvb_ringbuffer_flush(src);
break;
}
avail = dvb_ringbuffer_avail(src);
if (avail > todo)
avail = todo;
if (split < avail) {
if (copy_to_user(buf, src->data + src->pread, split))
return -EFAULT;
buf += split;
src->pread = 0;
todo -= split;
avail -= split;
}
if (avail) {
if (copy_to_user(buf, src->data + src->pread, avail))
return -EFAULT;
src->pread = (src->pread + avail) % src->size;
todo -= avail;
buf += avail;
}
ret = dvb_ringbuffer_read(src, buf, avail, 1);
if (ret < 0)
break;
buf += ret;
}
return count;
return (count - todo) ? (count - todo) : ret;
}
static struct dmx_frontend *get_fe(struct dmx_demux *demux, int type)
@ -179,13 +141,12 @@ static int dvb_dvr_open(struct inode *inode, struct file *file)
}
if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
dvb_dmxdev_buffer_init(&dmxdev->dvr_buffer);
dmxdev->dvr_buffer.size = DVR_BUFFER_SIZE;
dmxdev->dvr_buffer.data = vmalloc(DVR_BUFFER_SIZE);
if (!dmxdev->dvr_buffer.data) {
void *mem = vmalloc(DVR_BUFFER_SIZE);
if (!mem) {
mutex_unlock(&dmxdev->mutex);
return -ENOMEM;
}
dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE);
}
if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
@ -280,7 +241,7 @@ static inline void dvb_dmxdev_filter_state_set(struct dmxdev_filter
static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
unsigned long size)
{
struct dmxdev_buffer *buf = &dmxdevfilter->buffer;
struct dvb_ringbuffer *buf = &dmxdevfilter->buffer;
void *mem;
if (buf->size == size)
@ -291,7 +252,7 @@ static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
mem = buf->data;
buf->data = NULL;
buf->size = size;
buf->pwrite = buf->pread = 0;
dvb_ringbuffer_flush(buf);
spin_unlock_irq(&dmxdevfilter->dev->lock);
vfree(mem);
@ -359,8 +320,8 @@ static int dvb_dmxdev_section_callback(const u8 *buffer1, size_t buffer1_len,
buffer2_len);
}
if (ret < 0) {
dmxdevfilter->buffer.pwrite = dmxdevfilter->buffer.pread;
dmxdevfilter->buffer.error = -EOVERFLOW;
dvb_ringbuffer_flush(&dmxdevfilter->buffer);
dmxdevfilter->buffer.error = ret;
}
if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
dmxdevfilter->state = DMXDEV_STATE_DONE;
@ -375,7 +336,7 @@ static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
enum dmx_success success)
{
struct dmxdev_filter *dmxdevfilter = feed->priv;
struct dmxdev_buffer *buffer;
struct dvb_ringbuffer *buffer;
int ret;
spin_lock(&dmxdevfilter->dev->lock);
@ -397,8 +358,8 @@ static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
if (ret == buffer1_len)
ret = dvb_dmxdev_buffer_write(buffer, buffer2, buffer2_len);
if (ret < 0) {
buffer->pwrite = buffer->pread;
buffer->error = -EOVERFLOW;
dvb_ringbuffer_flush(buffer);
buffer->error = ret;
}
spin_unlock(&dmxdevfilter->dev->lock);
wake_up(&buffer->queue);
@ -494,7 +455,8 @@ static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
return 0;
return -EINVAL;
}
dmxdevfilter->buffer.pwrite = dmxdevfilter->buffer.pread = 0;
dvb_ringbuffer_flush(&dmxdevfilter->buffer);
return 0;
}
@ -520,16 +482,16 @@ static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
if (filter->state >= DMXDEV_STATE_GO)
dvb_dmxdev_filter_stop(filter);
if (!(mem = filter->buffer.data)) {
if (!filter->buffer.data) {
mem = vmalloc(filter->buffer.size);
if (!mem)
return -ENOMEM;
spin_lock_irq(&filter->dev->lock);
filter->buffer.data = mem;
spin_unlock_irq(&filter->dev->lock);
if (!filter->buffer.data)
return -ENOMEM;
}
filter->buffer.pwrite = filter->buffer.pread = 0;
dvb_ringbuffer_flush(&filter->buffer);
switch (filter->type) {
case DMXDEV_TYPE_SEC:
@ -692,7 +654,7 @@ static int dvb_demux_open(struct inode *inode, struct file *file)
mutex_init(&dmxdevfilter->mutex);
file->private_data = dmxdevfilter;
dvb_dmxdev_buffer_init(&dmxdevfilter->buffer);
dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
dmxdevfilter->type = DMXDEV_TYPE_NONE;
dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
dmxdevfilter->feed.ts = NULL;
@ -973,7 +935,7 @@ static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
if (dmxdevfilter->buffer.error)
mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
if (dmxdevfilter->buffer.pread != dmxdevfilter->buffer.pwrite)
if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
mask |= (POLLIN | POLLRDNORM | POLLPRI);
return mask;
@ -1047,7 +1009,7 @@ static unsigned int dvb_dvr_poll(struct file *file, poll_table *wait)
if (dmxdev->dvr_buffer.error)
mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
if (dmxdev->dvr_buffer.pread != dmxdev->dvr_buffer.pwrite)
if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
mask |= (POLLIN | POLLRDNORM | POLLPRI);
} else
mask |= (POLLOUT | POLLWRNORM | POLLPRI);
@ -1097,7 +1059,7 @@ int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
dmxdev, DVB_DEVICE_DVR);
dvb_dmxdev_buffer_init(&dmxdev->dvr_buffer);
dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
return 0;
}

14
drivers/media/dvb/dvb-core/dmxdev.h
View File

@ -36,6 +36,7 @@
#include "dvbdev.h"
#include "demux.h"
#include "dvb_ringbuffer.h"
enum dmxdev_type {
DMXDEV_TYPE_NONE,
@ -52,15 +53,6 @@ enum dmxdev_state {
DMXDEV_STATE_TIMEDOUT
};
struct dmxdev_buffer {
u8 *data;
int size;
int pread;
int pwrite;
wait_queue_head_t queue;
int error;
};
struct dmxdev_filter {
union {
struct dmx_section_filter *sec;
@ -79,7 +71,7 @@ struct dmxdev_filter {
enum dmxdev_type type;
enum dmxdev_state state;
struct dmxdev *dev;
struct dmxdev_buffer buffer;
struct dvb_ringbuffer buffer;
struct mutex mutex;
@ -102,7 +94,7 @@ struct dmxdev {
#define DMXDEV_CAP_DUPLEX 1
struct dmx_frontend *dvr_orig_fe;
struct dmxdev_buffer dvr_buffer;
struct dvb_ringbuffer dvr_buffer;
#define DVR_BUFFER_SIZE (10*188*1024)
struct mutex mutex;