diff options
Diffstat (limited to 'drivers/media/pci/cx18/cx18-queue.c')
| -rw-r--r-- | drivers/media/pci/cx18/cx18-queue.c | 443 |
1 files changed, 443 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-queue.c b/drivers/media/pci/cx18/cx18-queue.c new file mode 100644 index 000000000000..8884537bd62f --- /dev/null +++ b/drivers/media/pci/cx18/cx18-queue.c @@ -0,0 +1,443 @@ +/* + * 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. + * + * 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-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)); +} + +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); + } +} + +void cx18_queue_init(struct cx18_queue *q) +{ + INIT_LIST_HEAD(&q->list); + atomic_set(&q->depth, 0); + q->bytesused = 0; +} + +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; +} + +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; +} + +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); + } +} + +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); + } +} + +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; +} + +/* 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); +} + +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); +} + +/* + * 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); +} + +/* + * 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; + } +} + +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); +} + +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 = %zd\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; +} + +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); + } +} |