Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 | /*
* cx18 buffer queues
*
* 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
* 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 "cx18-driver.h"
#include "cx18-streams.h"
#include "cx18-queue.h"
#include "cx18-scb.h"
void cx18_buf_swap(struct cx18_buffer *buf)
{
int i;
for (i = 0; i < buf->bytesused; i += 4)
swab32s((u32 *)(buf->buf + i));
}
void cx18_queue_init(struct cx18_queue *q)
{
INIT_LIST_HEAD(&q->list);
atomic_set(&q->buffers, 0);
q->bytesused = 0;
}
struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
struct cx18_queue *q, int to_front)
{
/* clear the buffer if it is not to be enqueued to the full queue */
if (q != &s->q_full) {
buf->bytesused = 0;
buf->readpos = 0;
buf->b_flags = 0;
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;
if (to_front)
list_add(&buf->list, &q->list); /* LIFO */
else
list_add_tail(&buf->list, &q->list); /* FIFO */
q->bytesused += buf->bytesused - buf->readpos;
atomic_inc(&q->buffers);
mutex_unlock(&s->qlock);
return q;
}
struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q)
{
struct cx18_buffer *buf = NULL;
mutex_lock(&s->qlock);
if (!list_empty(&q->list)) {
buf = list_first_entry(&q->list, struct cx18_buffer, list);
list_del_init(&buf->list);
q->bytesused -= buf->bytesused - buf->readpos;
buf->skipped = 0;
atomic_dec(&q->buffers);
}
mutex_unlock(&s->qlock);
return buf;
}
struct cx18_buffer *cx18_queue_get_buf(struct cx18_stream *s, u32 id,
u32 bytesused)
{
struct cx18 *cx = s->cx;
struct cx18_buffer *buf;
struct cx18_buffer *tmp;
struct cx18_buffer *ret = NULL;
mutex_lock(&s->qlock);
list_for_each_entry_safe(buf, tmp, &s->q_busy.list, list) {
if (buf->id != id) {
buf->skipped++;
if (buf->skipped >= atomic_read(&s->q_busy.buffers)-1) {
/* buffer must have fallen out of rotation */
CX18_WARN("Skipped %s, buffer %d, %d "
"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;
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);
}
atomic_dec(&s->q_busy.buffers);
ret = buf;
break;
}
mutex_unlock(&s->qlock);
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)
{
struct cx18_buffer *buf;
if (q == &s->q_free)
return;
mutex_lock(&s->qlock);
while (!list_empty(&q->list)) {
buf = list_first_entry(&q->list, struct cx18_buffer, list);
list_move_tail(&buf->list, &s->q_free.list);
buf->bytesused = buf->readpos = buf->b_flags = buf->skipped = 0;
atomic_inc(&s->q_free.buffers);
}
cx18_queue_init(q);
mutex_unlock(&s->qlock);
}
void cx18_flush_queues(struct cx18_stream *s)
{
cx18_queue_flush(s, &s->q_busy);
cx18_queue_flush(s, &s->q_full);
}
int cx18_stream_alloc(struct cx18_stream *s)
{
struct cx18 *cx = s->cx;
int i;
if (s->buffers == 0)
return 0;
CX18_DEBUG_INFO("Allocate %s stream: %d x %d buffers (%dkB total)\n",
s->name, s->buffers, s->buf_size,
s->buffers * s->buf_size / 1024);
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",
bufsz / sizeof(struct cx18_mdl));
return -ENOMEM;
}
s->mdl_offset = cx->mdl_offset;
/* allocate stream buffers. Initially all buffers are in q_free. */
for (i = 0; i < s->buffers; i++) {
struct cx18_buffer *buf = kzalloc(sizeof(struct cx18_buffer),
GFP_KERNEL|__GFP_NOWARN);
if (buf == NULL)
break;
buf->buf = kmalloc(s->buf_size, GFP_KERNEL|__GFP_NOWARN);
if (buf->buf == NULL) {
kfree(buf);
break;
}
buf->id = cx->buffer_id++;
INIT_LIST_HEAD(&buf->list);
buf->dma_handle = pci_map_single(s->cx->dev,
buf->buf, s->buf_size, s->dma);
cx18_buf_sync_for_cpu(s, buf);
cx18_enqueue(s, buf, &s->q_free);
}
if (i == s->buffers) {
cx->mdl_offset += s->buffers;
return 0;
}
CX18_ERR("Couldn't allocate buffers for %s stream\n", s->name);
cx18_stream_free(s);
return -ENOMEM;
}
void cx18_stream_free(struct cx18_stream *s)
{
struct cx18_buffer *buf;
/* move all buffers to q_free */
cx18_flush_queues(s);
/* empty q_free */
while ((buf = cx18_dequeue(s, &s->q_free))) {
pci_unmap_single(s->cx->dev, buf->dma_handle,
s->buf_size, s->dma);
kfree(buf->buf);
kfree(buf);
}
}
|