Release 4.11 drivers/media/pci/cx18/cx18-queue.c
/*
* cx18 buffer queues
*
* Derived from ivtv-queue.c
*
* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
* Copyright (C) 2008 Andy Walls <awalls@md.metrocast.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.
*/
#include "cx18-driver.h"
#include "cx18-queue.h"
#include "cx18-streams.h"
#include "cx18-scb.h"
#include "cx18-io.h"
void cx18_buf_swap(struct cx18_buffer *buf)
{
int i;
for (i = 0; i < buf->bytesused; i += 4)
swab32s((u32 *)(buf->buf + i));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hans Verkuil | 44 | 100.00% | 1 | 100.00% |
| Total | 44 | 100.00% | 1 | 100.00% |
void _cx18_mdl_swap(struct cx18_mdl *mdl)
{
struct cx18_buffer *buf;
list_for_each_entry(buf, &mdl->buf_list, list) {
if (buf->bytesused == 0)
break;
cx18_buf_swap(buf);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 39 | 100.00% | 1 | 100.00% |
| Total | 39 | 100.00% | 1 | 100.00% |
void cx18_queue_init(struct cx18_queue *q)
{
INIT_LIST_HEAD(&q->list);
atomic_set(&q->depth, 0);
q->bytesused = 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hans Verkuil | 28 | 82.35% | 1 | 33.33% |
| Andy Walls | 6 | 17.65% | 2 | 66.67% |
| Total | 34 | 100.00% | 3 | 100.00% |
struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
struct cx18_queue *q, int to_front)
{
/* clear the mdl if it is not to be enqueued to the full queue */
if (q != &s->q_full) {
mdl->bytesused = 0;
mdl->readpos = 0;
mdl->m_flags = 0;
mdl->skipped = 0;
mdl->curr_buf = NULL;
}
/* q_busy is restricted to a max buffer count imposed by firmware */
if (q == &s->q_busy &&
atomic_read(&q->depth) >= CX18_MAX_FW_MDLS_PER_STREAM)
q = &s->q_free;
spin_lock(&q->lock);
if (to_front)
list_add(&mdl->list, &q->list); /* LIFO */
else
list_add_tail(&mdl->list, &q->list); /* FIFO */
q->bytesused += mdl->bytesused - mdl->readpos;
atomic_inc(&q->depth);
spin_unlock(&q->lock);
return q;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 100 | 60.24% | 7 | 87.50% |
| Hans Verkuil | 66 | 39.76% | 1 | 12.50% |
| Total | 166 | 100.00% | 8 | 100.00% |
struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q)
{
struct cx18_mdl *mdl = NULL;
spin_lock(&q->lock);
if (!list_empty(&q->list)) {
mdl = list_first_entry(&q->list, struct cx18_mdl, list);
list_del_init(&mdl->list);
q->bytesused -= mdl->bytesused - mdl->readpos;
mdl->skipped = 0;
atomic_dec(&q->depth);
}
spin_unlock(&q->lock);
return mdl;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hans Verkuil | 73 | 69.52% | 1 | 14.29% |
| Andy Walls | 32 | 30.48% | 6 | 85.71% |
| Total | 105 | 100.00% | 7 | 100.00% |
static void _cx18_mdl_update_bufs_for_cpu(struct cx18_stream *s,
struct cx18_mdl *mdl)
{
struct cx18_buffer *buf;
u32 buf_size = s->buf_size;
u32 bytesused = mdl->bytesused;
list_for_each_entry(buf, &mdl->buf_list, list) {
buf->readpos = 0;
if (bytesused >= buf_size) {
buf->bytesused = buf_size;
bytesused -= buf_size;
} else {
buf->bytesused = bytesused;
bytesused = 0;
}
cx18_buf_sync_for_cpu(s, buf);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 89 | 100.00% | 2 | 100.00% |
| Total | 89 | 100.00% | 2 | 100.00% |
static inline void cx18_mdl_update_bufs_for_cpu(struct cx18_stream *s,
struct cx18_mdl *mdl)
{
struct cx18_buffer *buf;
if (list_is_singular(&mdl->buf_list)) {
buf = list_first_entry(&mdl->buf_list, struct cx18_buffer,
list);
buf->bytesused = mdl->bytesused;
buf->readpos = 0;
cx18_buf_sync_for_cpu(s, buf);
} else {
_cx18_mdl_update_bufs_for_cpu(s, mdl);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 77 | 96.25% | 2 | 66.67% |
| Hans Verkuil | 3 | 3.75% | 1 | 33.33% |
| Total | 80 | 100.00% | 3 | 100.00% |
struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
u32 bytesused)
{
struct cx18 *cx = s->cx;
struct cx18_mdl *mdl;
struct cx18_mdl *tmp;
struct cx18_mdl *ret = NULL;
LIST_HEAD(sweep_up);
/*
* We don't have to acquire multiple q locks here, because we are
* serialized by the single threaded work handler.
* MDLs 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(mdl, 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 an mdl done message from the firmware.
* Once we skip an mdl repeatedly, relative to the size of
* q_busy, we have high confidence we've missed it.
*/
if (mdl->id != id) {
mdl->skipped++;
if (mdl->skipped >= atomic_read(&s->q_busy.depth)-1) {
/* mdl must have fallen out of rotation */
CX18_WARN("Skipped %s, MDL %d, %d times - it must have dropped out of rotation\n",
s->name, mdl->id,
mdl->skipped);
/* Sweep it up to put it back into rotation */
list_move_tail(&mdl->list, &sweep_up);
atomic_dec(&s->q_busy.depth);
}
continue;
}
/*
* We pull the desired mdl off of the queue here. Something
* will have to put it back on a queue later.
*/
list_del_init(&mdl->list);
atomic_dec(&s->q_busy.depth);
ret = mdl;
break;
}
spin_unlock(&s->q_busy.lock);
/*
* We found the mdl 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;
/* 0'ed readpos, m_flags & curr_buf when mdl went on q_busy */
cx18_mdl_update_bufs_for_cpu(s, ret);
if (s->type != CX18_ENC_STREAM_TYPE_TS)
set_bit(CX18_F_M_NEED_SWAP, &ret->m_flags);
}
/* Put any mdls the firmware is ignoring back into normal rotation */
list_for_each_entry_safe(mdl, tmp, &sweep_up, list) {
list_del_init(&mdl->list);
cx18_enqueue(s, mdl, &s->q_free);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 214 | 80.45% | 11 | 84.62% |
| Hans Verkuil | 51 | 19.17% | 1 | 7.69% |
| Mauro Carvalho Chehab | 1 | 0.38% | 1 | 7.69% |
| Total | 266 | 100.00% | 13 | 100.00% |
/* Move all mdls of a queue, while flushing the mdl */
static void cx18_queue_flush(struct cx18_stream *s,
struct cx18_queue *q_src, struct cx18_queue *q_dst)
{
struct cx18_mdl *mdl;
/* It only makes sense to flush to q_free or q_idle */
if (q_src == q_dst || q_dst == &s->q_full || q_dst == &s->q_busy)
return;
spin_lock(&q_src->lock);
spin_lock(&q_dst->lock);
while (!list_empty(&q_src->list)) {
mdl = list_first_entry(&q_src->list, struct cx18_mdl, list);
list_move_tail(&mdl->list, &q_dst->list);
mdl->bytesused = 0;
mdl->readpos = 0;
mdl->m_flags = 0;
mdl->skipped = 0;
mdl->curr_buf = NULL;
atomic_inc(&q_dst->depth);
}
cx18_queue_init(q_src);
spin_unlock(&q_src->lock);
spin_unlock(&q_dst->lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 135 | 82.32% | 4 | 80.00% |
| Hans Verkuil | 29 | 17.68% | 1 | 20.00% |
| Total | 164 | 100.00% | 5 | 100.00% |
void cx18_flush_queues(struct cx18_stream *s)
{
cx18_queue_flush(s, &s->q_busy, &s->q_free);
cx18_queue_flush(s, &s->q_full, &s->q_free);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 39 | 97.50% | 2 | 66.67% |
| Hans Verkuil | 1 | 2.50% | 1 | 33.33% |
| Total | 40 | 100.00% | 3 | 100.00% |
/*
* Note, s->buf_pool is not protected by a lock,
* the stream better not have *anything* going on when calling this
*/
void cx18_unload_queues(struct cx18_stream *s)
{
struct cx18_queue *q_idle = &s->q_idle;
struct cx18_mdl *mdl;
struct cx18_buffer *buf;
/* Move all MDLS to q_idle */
cx18_queue_flush(s, &s->q_busy, q_idle);
cx18_queue_flush(s, &s->q_full, q_idle);
cx18_queue_flush(s, &s->q_free, q_idle);
/* Reset MDL id's and move all buffers back to the stream's buf_pool */
spin_lock(&q_idle->lock);
list_for_each_entry(mdl, &q_idle->list, list) {
while (!list_empty(&mdl->buf_list)) {
buf = list_first_entry(&mdl->buf_list,
struct cx18_buffer, list);
list_move_tail(&buf->list, &s->buf_pool);
buf->bytesused = 0;
buf->readpos = 0;
}
mdl->id = s->mdl_base_idx; /* reset id to a "safe" value */
/* all other mdl fields were cleared by cx18_queue_flush() */
}
spin_unlock(&q_idle->lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 146 | 92.99% | 1 | 50.00% |
| Hans Verkuil | 11 | 7.01% | 1 | 50.00% |
| Total | 157 | 100.00% | 2 | 100.00% |
/*
* Note, s->buf_pool is not protected by a lock,
* the stream better not have *anything* going on when calling this
*/
void cx18_load_queues(struct cx18_stream *s)
{
struct cx18 *cx = s->cx;
struct cx18_mdl *mdl;
struct cx18_buffer *buf;
int mdl_id;
int i;
u32 partial_buf_size;
/*
* Attach buffers to MDLs, give the MDLs ids, and add MDLs to q_free
* Excess MDLs are left on q_idle
* Excess buffers are left in buf_pool and/or on an MDL in q_idle
*/
mdl_id = s->mdl_base_idx;
for (mdl = cx18_dequeue(s, &s->q_idle), i = s->bufs_per_mdl;
mdl != NULL && i == s->bufs_per_mdl;
mdl = cx18_dequeue(s, &s->q_idle)) {
mdl->id = mdl_id;
for (i = 0; i < s->bufs_per_mdl; i++) {
if (list_empty(&s->buf_pool))
break;
buf = list_first_entry(&s->buf_pool, struct cx18_buffer,
list);
list_move_tail(&buf->list, &mdl->buf_list);
/* update the firmware's MDL array with this buffer */
cx18_writel(cx, buf->dma_handle,
&cx->scb->cpu_mdl[mdl_id + i].paddr);
cx18_writel(cx, s->buf_size,
&cx->scb->cpu_mdl[mdl_id + i].length);
}
if (i == s->bufs_per_mdl) {
/*
* The encoder doesn't honor s->mdl_size. So in the
* case of a non-integral number of buffers to meet
* mdl_size, we lie about the size of the last buffer
* in the MDL to get the encoder to really only send
* us mdl_size bytes per MDL transfer.
*/
partial_buf_size = s->mdl_size % s->buf_size;
if (partial_buf_size) {
cx18_writel(cx, partial_buf_size,
&cx->scb->cpu_mdl[mdl_id + i - 1].length);
}
cx18_enqueue(s, mdl, &s->q_free);
} else {
/* Not enough buffers for this MDL; we won't use it */
cx18_push(s, mdl, &s->q_idle);
}
mdl_id += i;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 272 | 97.14% | 4 | 80.00% |
| Hans Verkuil | 8 | 2.86% | 1 | 20.00% |
| Total | 280 | 100.00% | 5 | 100.00% |
void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl)
{
int dma = s->dma;
u32 buf_size = s->buf_size;
struct pci_dev *pci_dev = s->cx->pci_dev;
struct cx18_buffer *buf;
list_for_each_entry(buf, &mdl->buf_list, list)
pci_dma_sync_single_for_device(pci_dev, buf->dma_handle,
buf_size, dma);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 52 | 78.79% | 2 | 66.67% |
| Hans Verkuil | 14 | 21.21% | 1 | 33.33% |
| Total | 66 | 100.00% | 3 | 100.00% |
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 (%d.%02d kB total)\n",
s->name, s->buffers, s->buf_size,
s->buffers * s->buf_size / 1024,
(s->buffers * s->buf_size * 100 / 1024) % 100);
if (((char __iomem *)&cx->scb->cpu_mdl[cx->free_mdl_idx + 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 = %zu\n",
bufsz / sizeof(struct cx18_mdl_ent));
return -ENOMEM;
}
s->mdl_base_idx = cx->free_mdl_idx;
/* allocate stream buffers and MDLs */
for (i = 0; i < s->buffers; i++) {
struct cx18_mdl *mdl;
struct cx18_buffer *buf;
/* 1 MDL per buffer to handle the worst & also default case */
mdl = kzalloc(sizeof(struct cx18_mdl), GFP_KERNEL|__GFP_NOWARN);
if (mdl == NULL)
break;
buf = kzalloc(sizeof(struct cx18_buffer),
GFP_KERNEL|__GFP_NOWARN);
if (buf == NULL) {
kfree(mdl);
break;
}
buf->buf = kmalloc(s->buf_size, GFP_KERNEL|__GFP_NOWARN);
if (buf->buf == NULL) {
kfree(mdl);
kfree(buf);
break;
}
INIT_LIST_HEAD(&mdl->list);
INIT_LIST_HEAD(&mdl->buf_list);
mdl->id = s->mdl_base_idx; /* a somewhat safe value */
cx18_enqueue(s, mdl, &s->q_idle);
INIT_LIST_HEAD(&buf->list);
buf->dma_handle = pci_map_single(s->cx->pci_dev,
buf->buf, s->buf_size, s->dma);
cx18_buf_sync_for_cpu(s, buf);
list_add_tail(&buf->list, &s->buf_pool);
}
if (i == s->buffers) {
cx->free_mdl_idx += s->buffers;
return 0;
}
CX18_ERR("Couldn't allocate buffers for %s stream\n", s->name);
cx18_stream_free(s);
return -ENOMEM;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hans Verkuil | 314 | 74.76% | 3 | 30.00% |
| Andy Walls | 104 | 24.76% | 5 | 50.00% |
| Mauro Carvalho Chehab | 2 | 0.48% | 2 | 20.00% |
| Total | 420 | 100.00% | 10 | 100.00% |
void cx18_stream_free(struct cx18_stream *s)
{
struct cx18_mdl *mdl;
struct cx18_buffer *buf;
struct cx18 *cx = s->cx;
CX18_DEBUG_INFO("Deallocating buffers for %s stream\n", s->name);
/* move all buffers to buf_pool and all MDLs to q_idle */
cx18_unload_queues(s);
/* empty q_idle */
while ((mdl = cx18_dequeue(s, &s->q_idle)))
kfree(mdl);
/* empty buf_pool */
while (!list_empty(&s->buf_pool)) {
buf = list_first_entry(&s->buf_pool, struct cx18_buffer, list);
list_del_init(&buf->list);
pci_unmap_single(s->cx->pci_dev, buf->dma_handle,
s->buf_size, s->dma);
kfree(buf->buf);
kfree(buf);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 69 | 50.74% | 3 | 75.00% |
| Hans Verkuil | 67 | 49.26% | 1 | 25.00% |
| Total | 136 | 100.00% | 4 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andy Walls | 1382 | 65.65% | 21 | 77.78% |
| Hans Verkuil | 719 | 34.16% | 3 | 11.11% |
| Mauro Carvalho Chehab | 3 | 0.14% | 2 | 7.41% |
| Sakari Ailus | 1 | 0.05% | 1 | 3.70% |
| Total | 2105 | 100.00% | 27 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.