diff options
author | Mauro Carvalho Chehab <mchehab@infradead.org> | 2006-03-10 12:29:15 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2006-03-24 16:26:49 -0300 |
commit | c7b0ac0546985fc6361a8d92cf808d46da797677 (patch) | |
tree | 2147eb2f6dd7b2b82e0d7b4b9a26e12ef5193252 /drivers/media/video/video-buf.c | |
parent | b2fd16b4ff2508ac16ae994f4bcd941f97754c00 (diff) | |
download | linux-c7b0ac0546985fc6361a8d92cf808d46da797677.tar.gz linux-c7b0ac0546985fc6361a8d92cf808d46da797677.tar.bz2 linux-c7b0ac0546985fc6361a8d92cf808d46da797677.zip |
V4L/DVB (3516): Make video_buf more generic
Video_buf were concerned to allow PCI devices to be used as
video capture devices. This patch extends video_buf features
by virtualizing pci-dependent functions and allowing other
type of devices to use it.
It is still DMA centric, although it may be used also by
devices that emulates scatter/gather behavior or a DMA device
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/video/video-buf.c')
-rw-r--r-- | drivers/media/video/video-buf.c | 250 |
1 files changed, 187 insertions, 63 deletions
diff --git a/drivers/media/video/video-buf.c b/drivers/media/video/video-buf.c index 87e937581d5a..d2ca0f08d0df 100644 --- a/drivers/media/video/video-buf.c +++ b/drivers/media/video/video-buf.c @@ -1,15 +1,20 @@ /* * * generic helper functions for video4linux capture buffers, to handle - * memory management and PCI DMA. Right now bttv + saa7134 use it. + * memory management and PCI DMA. + * Right now, bttv, saa7134, saa7146 and cx88 use it. * * The functions expect the hardware being able to scatter gatter * (i.e. the buffers are not linear in physical memory, but fragmented * into PAGE_SIZE chunks). They also assume the driver does not need - * to touch the video data (thus it is probably not useful for USB 1.1 - * as data often must be uncompressed by the drivers). + * to touch the video data. + * + * device specific map/unmap/sync stuff now are mapped as operations + * to allow its usage by USB and virtual devices. * * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] + * (c) 2006 Mauro Carvalho Chehab <mchehab@infradead.org> + * (c) 2006 Ted Walther and John Sokol * * 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 @@ -167,6 +172,9 @@ int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages); return -ENOMEM; } + dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n", + (unsigned long)dma->vmalloc, + nr_pages << PAGE_SHIFT); memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT); dma->nr_pages = nr_pages; return 0; @@ -186,8 +194,10 @@ int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, return 0; } -int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma) +int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma) { + void *dev=q->dev; + MAGIC_CHECK(dma->magic,MAGIC_DMABUF); BUG_ON(0 == dma->nr_pages); @@ -197,7 +207,7 @@ int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma) } if (dma->vmalloc) { dma->sglist = videobuf_vmalloc_to_sg - (dma->vmalloc,dma->nr_pages); + (dma->vmalloc,dma->nr_pages); } if (dma->bus_addr) { dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL); @@ -212,13 +222,14 @@ int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma) dprintk(1,"scatterlist is NULL\n"); return -ENOMEM; } - if (!dma->bus_addr) { - dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages, - dma->direction); + if (q->ops->vb_map_sg) { + dma->sglen = q->ops->vb_map_sg(dev,dma->sglist, + dma->nr_pages, dma->direction); + } if (0 == dma->sglen) { printk(KERN_WARNING - "%s: pci_map_sg failed\n",__FUNCTION__); + "%s: videobuf_map_sg failed\n",__FUNCTION__); kfree(dma->sglist); dma->sglist = NULL; dma->sglen = 0; @@ -228,24 +239,31 @@ int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma) return 0; } -int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma) +int videobuf_dma_sync(struct videobuf_queue* q,struct videobuf_dmabuf *dma) { + void *dev=q->dev; + MAGIC_CHECK(dma->magic,MAGIC_DMABUF); BUG_ON(!dma->sglen); - if (!dma->bus_addr) - pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction); + if (!dma->bus_addr && q->ops->vb_dma_sync_sg) + q->ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages, + dma->direction); + return 0; } -int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma) +int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma) { + void *dev=q->dev; + MAGIC_CHECK(dma->magic,MAGIC_DMABUF); if (!dma->sglen) return 0; - if (!dma->bus_addr) - pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction); + if (!dma->bus_addr && q->ops->vb_unmap_sg) + q->ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages, + dma->direction); kfree(dma->sglist); dma->sglist = NULL; dma->sglen = 0; @@ -318,7 +336,7 @@ int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) } int -videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb, +videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb, struct v4l2_framebuffer *fbuf) { int err,pages; @@ -357,7 +375,7 @@ videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb, default: BUG(); } - err = videobuf_dma_pci_map(pci,&vb->dma); + err = videobuf_dma_map(q,&vb->dma); if (0 != err) return err; @@ -366,9 +384,41 @@ videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb, /* --------------------------------------------------------------------- */ +void videobuf_queue_pci(struct videobuf_queue* q) +{ + /* If not specified, defaults to PCI map sg */ + if (!q->ops->vb_map_sg) + q->ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg; + + if (!q->ops->vb_dma_sync_sg) + q->ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu; + if (!q->ops->vb_unmap_sg) + q->ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg; +} + +int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma) +{ + struct videobuf_queue q; + + q.dev=pci; + q.ops->vb_map_sg=(vb_map_sg_t *)pci_unmap_sg; + + return (videobuf_dma_unmap(&q,dma)); +} + +int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma) +{ + struct videobuf_queue q; + + q.dev=pci; + q.ops->vb_map_sg=(vb_map_sg_t *)pci_unmap_sg; + + return (videobuf_dma_unmap(&q,dma)); +} + void videobuf_queue_init(struct videobuf_queue* q, struct videobuf_queue_ops *ops, - struct pci_dev *pci, + void *dev, spinlock_t *irqlock, enum v4l2_buf_type type, enum v4l2_field field, @@ -377,13 +427,15 @@ void videobuf_queue_init(struct videobuf_queue* q, { memset(q,0,sizeof(*q)); q->irqlock = irqlock; - q->pci = pci; + q->dev = dev; q->type = type; q->field = field; q->msize = msize; q->ops = ops; q->priv_data = priv; + videobuf_queue_pci(q); + mutex_init(&q->lock); INIT_LIST_HEAD(&q->stream); } @@ -431,7 +483,8 @@ videobuf_queue_cancel(struct videobuf_queue *q) int i; /* remove queued buffers from list */ - spin_lock_irqsave(q->irqlock,flags); + if (q->irqlock) + spin_lock_irqsave(q->irqlock,flags); for (i = 0; i < VIDEO_MAX_FRAME; i++) { if (NULL == q->bufs[i]) continue; @@ -440,7 +493,8 @@ videobuf_queue_cancel(struct videobuf_queue *q) q->bufs[i]->state = STATE_ERROR; } } - spin_unlock_irqrestore(q->irqlock,flags); + if (q->irqlock) + spin_unlock_irqrestore(q->irqlock,flags); /* free all buffers + clear queue */ for (i = 0; i < VIDEO_MAX_FRAME; i++) { @@ -534,19 +588,29 @@ videobuf_reqbufs(struct videobuf_queue *q, unsigned int size,count; int retval; - if (req->type != q->type) + if (req->type != q->type) { + dprintk(1,"reqbufs: queue type invalid\n"); return -EINVAL; - if (req->count < 1) + } + if (req->count < 1) { + dprintk(1,"reqbufs: count invalid (%d)\n",req->count); return -EINVAL; + } if (req->memory != V4L2_MEMORY_MMAP && req->memory != V4L2_MEMORY_USERPTR && - req->memory != V4L2_MEMORY_OVERLAY) + req->memory != V4L2_MEMORY_OVERLAY) { + dprintk(1,"reqbufs: memory type invalid\n"); return -EINVAL; + } - if (q->streaming) + if (q->streaming) { + dprintk(1,"reqbufs: streaming already exists\n"); return -EBUSY; - if (!list_empty(&q->stream)) + } + if (!list_empty(&q->stream)) { + dprintk(1,"reqbufs: stream running\n"); return -EBUSY; + } mutex_lock(&q->lock); count = req->count; @@ -559,8 +623,10 @@ videobuf_reqbufs(struct videobuf_queue *q, count, size, (count*size)>>PAGE_SHIFT); retval = videobuf_mmap_setup(q,count,size,req->memory); - if (retval < 0) + if (retval < 0) { + dprintk(1,"reqbufs: mmap setup returned %d\n",retval); goto done; + } req->count = count; @@ -572,12 +638,18 @@ videobuf_reqbufs(struct videobuf_queue *q, int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) { - if (unlikely(b->type != q->type)) + if (unlikely(b->type != q->type)) { + dprintk(1,"querybuf: Wrong type.\n"); return -EINVAL; - if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) + } + if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) { + dprintk(1,"querybuf: index out of range.\n"); return -EINVAL; - if (unlikely(NULL == q->bufs[b->index])) + } + if (unlikely(NULL == q->bufs[b->index])) { + dprintk(1,"querybuf: buffer is null.\n"); return -EINVAL; + } videobuf_status(b,q->bufs[b->index],q->type); return 0; } @@ -593,26 +665,40 @@ videobuf_qbuf(struct videobuf_queue *q, mutex_lock(&q->lock); retval = -EBUSY; - if (q->reading) + if (q->reading) { + dprintk(1,"qbuf: Reading running...\n"); goto done; + } retval = -EINVAL; - if (b->type != q->type) + if (b->type != q->type) { + dprintk(1,"qbuf: Wrong type.\n"); goto done; - if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) + } + if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) { + dprintk(1,"qbuf: index out of range.\n"); goto done; + } buf = q->bufs[b->index]; - if (NULL == buf) + if (NULL == buf) { + dprintk(1,"qbuf: buffer is null.\n"); goto done; + } MAGIC_CHECK(buf->magic,MAGIC_BUFFER); - if (buf->memory != b->memory) + if (buf->memory != b->memory) { + dprintk(1,"qbuf: memory type is wrong.\n"); goto done; + } if (buf->state == STATE_QUEUED || - buf->state == STATE_ACTIVE) + buf->state == STATE_ACTIVE) { + dprintk(1,"qbuf: buffer is already queued or active.\n"); goto done; + } if (b->flags & V4L2_BUF_FLAG_INPUT) { - if (b->input >= q->inputs) + if (b->input >= q->inputs) { + dprintk(1,"qbuf: wrong input.\n"); goto done; + } buf->input = b->input; } else { buf->input = UNSET; @@ -620,12 +706,16 @@ videobuf_qbuf(struct videobuf_queue *q, switch (b->memory) { case V4L2_MEMORY_MMAP: - if (0 == buf->baddr) + if (0 == buf->baddr) { + dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n"); goto done; + } break; case V4L2_MEMORY_USERPTR: - if (b->length < buf->bsize) + if (b->length < buf->bsize) { + dprintk(1,"qbuf: buffer length is not enough\n"); goto done; + } if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr) q->ops->buf_release(q,buf); buf->baddr = b->m.userptr; @@ -634,20 +724,27 @@ videobuf_qbuf(struct videobuf_queue *q, buf->boff = b->m.offset; break; default: + dprintk(1,"qbuf: wrong memory type\n"); goto done; } + dprintk(1,"qbuf: requesting next field\n"); field = videobuf_next_field(q); retval = q->ops->buf_prepare(q,buf,field); - if (0 != retval) + if (0 != retval) { + dprintk(1,"qbuf: buffer_prepare returned %d\n",retval); goto done; + } list_add_tail(&buf->stream,&q->stream); if (q->streaming) { - spin_lock_irqsave(q->irqlock,flags); + if (q->irqlock) + spin_lock_irqsave(q->irqlock,flags); q->ops->buf_queue(q,buf); - spin_unlock_irqrestore(q->irqlock,flags); + if (q->irqlock) + spin_unlock_irqrestore(q->irqlock,flags); } + dprintk(1,"qbuf: succeded\n"); retval = 0; done: @@ -664,26 +761,39 @@ videobuf_dqbuf(struct videobuf_queue *q, mutex_lock(&q->lock); retval = -EBUSY; - if (q->reading) + if (q->reading) { + dprintk(1,"dqbuf: Reading running...\n"); goto done; + } retval = -EINVAL; - if (b->type != q->type) + if (b->type != q->type) { + dprintk(1,"dqbuf: Wrong type.\n"); goto done; - if (list_empty(&q->stream)) + } + if (list_empty(&q->stream)) { + dprintk(1,"dqbuf: stream running\n"); goto done; + } buf = list_entry(q->stream.next, struct videobuf_buffer, stream); retval = videobuf_waiton(buf, nonblocking, 1); - if (retval < 0) + if (retval < 0) { + dprintk(1,"dqbuf: waiton returned %d\n",retval); goto done; + } switch (buf->state) { case STATE_ERROR: + dprintk(1,"dqbuf: state is error\n"); retval = -EIO; - /* fall through */ + videobuf_dma_sync(q,&buf->dma); + buf->state = STATE_IDLE; + break; case STATE_DONE: - videobuf_dma_pci_sync(q->pci,&buf->dma); + dprintk(1,"dqbuf: state is done\n"); + videobuf_dma_sync(q,&buf->dma); buf->state = STATE_IDLE; break; default: + dprintk(1,"dqbuf: state invalid\n"); retval = -EINVAL; goto done; } @@ -711,13 +821,15 @@ int videobuf_streamon(struct videobuf_queue *q) if (q->streaming) goto done; q->streaming = 1; - spin_lock_irqsave(q->irqlock,flags); + if (q->irqlock) + spin_lock_irqsave(q->irqlock,flags); list_for_each(list,&q->stream) { buf = list_entry(list, struct videobuf_buffer, stream); if (buf->state == STATE_PREPARED) q->ops->buf_queue(q,buf); } - spin_unlock_irqrestore(q->irqlock,flags); + if (q->irqlock) + spin_unlock_irqrestore(q->irqlock,flags); done: mutex_unlock(&q->lock); @@ -762,12 +874,14 @@ videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data, goto done; /* start capture & wait */ - spin_lock_irqsave(q->irqlock,flags); + if (q->irqlock) + spin_lock_irqsave(q->irqlock,flags); q->ops->buf_queue(q,q->read_buf); - spin_unlock_irqrestore(q->irqlock,flags); + if (q->irqlock) + spin_unlock_irqrestore(q->irqlock,flags); retval = videobuf_waiton(q->read_buf,0,0); if (0 == retval) { - videobuf_dma_pci_sync(q->pci,&q->read_buf->dma); + videobuf_dma_sync(q,&q->read_buf->dma); if (STATE_ERROR == q->read_buf->state) retval = -EIO; else @@ -809,6 +923,7 @@ ssize_t videobuf_read_one(struct videobuf_queue *q, /* need to capture a new frame */ retval = -ENOMEM; q->read_buf = videobuf_alloc(q->msize); + dprintk(1,"video alloc=0x%08x\n",(unsigned int) q->read_buf); if (NULL == q->read_buf) goto done; q->read_buf->memory = V4L2_MEMORY_USERPTR; @@ -820,9 +935,11 @@ ssize_t videobuf_read_one(struct videobuf_queue *q, q->read_buf = NULL; goto done; } - spin_lock_irqsave(q->irqlock,flags); + if (q->irqlock) + spin_lock_irqsave(q->irqlock,flags); q->ops->buf_queue(q,q->read_buf); - spin_unlock_irqrestore(q->irqlock,flags); + if (q->irqlock) + spin_unlock_irqrestore(q->irqlock,flags); q->read_off = 0; } @@ -830,7 +947,7 @@ ssize_t videobuf_read_one(struct videobuf_queue *q, retval = videobuf_waiton(q->read_buf, nonblocking, 1); if (0 != retval) goto done; - videobuf_dma_pci_sync(q->pci,&q->read_buf->dma); + videobuf_dma_sync(q,&q->read_buf->dma); if (STATE_ERROR == q->read_buf->state) { /* catch I/O errors */ @@ -887,10 +1004,12 @@ int videobuf_read_start(struct videobuf_queue *q) return err; list_add_tail(&q->bufs[i]->stream, &q->stream); } - spin_lock_irqsave(q->irqlock,flags); + if (q->irqlock) + spin_lock_irqsave(q->irqlock,flags); for (i = 0; i < count; i++) q->ops->buf_queue(q,q->bufs[i]); - spin_unlock_irqrestore(q->irqlock,flags); + if (q->irqlock) + spin_unlock_irqrestore(q->irqlock,flags); q->reading = 1; return 0; } @@ -985,9 +1104,11 @@ ssize_t videobuf_read_stream(struct videobuf_queue *q, if (q->read_off == q->read_buf->size) { list_add_tail(&q->read_buf->stream, &q->stream); - spin_lock_irqsave(q->irqlock,flags); + if (q->irqlock) + spin_lock_irqsave(q->irqlock,flags); q->ops->buf_queue(q,q->read_buf); - spin_unlock_irqrestore(q->irqlock,flags); + if (q->irqlock) + spin_unlock_irqrestore(q->irqlock,flags); q->read_buf = NULL; } if (retval < 0) @@ -1249,11 +1370,14 @@ EXPORT_SYMBOL_GPL(videobuf_dma_init); EXPORT_SYMBOL_GPL(videobuf_dma_init_user); EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); -EXPORT_SYMBOL_GPL(videobuf_dma_pci_map); -EXPORT_SYMBOL_GPL(videobuf_dma_pci_sync); -EXPORT_SYMBOL_GPL(videobuf_dma_pci_unmap); +EXPORT_SYMBOL_GPL(videobuf_dma_map); +EXPORT_SYMBOL_GPL(videobuf_dma_sync); +EXPORT_SYMBOL_GPL(videobuf_dma_unmap); EXPORT_SYMBOL_GPL(videobuf_dma_free); +EXPORT_SYMBOL_GPL(videobuf_pci_dma_map); +EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap); + EXPORT_SYMBOL_GPL(videobuf_alloc); EXPORT_SYMBOL_GPL(videobuf_waiton); EXPORT_SYMBOL_GPL(videobuf_iolock); |