1291 строка
29 KiB
C
1291 строка
29 KiB
C
/*
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* $Id: video-buf.c,v 1.18 2005/02/24 13:32:30 kraxel Exp $
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*
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* generic helper functions for video4linux capture buffers, to handle
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* memory management and PCI DMA. Right now bttv + saa7134 use it.
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*
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* The functions expect the hardware being able to scatter gatter
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* (i.e. the buffers are not linear in physical memory, but fragmented
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* into PAGE_SIZE chunks). They also assume the driver does not need
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* to touch the video data (thus it is probably not useful for USB 1.1
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* as data often must be uncompressed by the drivers).
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*
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* (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/vmalloc.h>
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#include <linux/pagemap.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <media/video-buf.h>
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#define MAGIC_DMABUF 0x19721112
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#define MAGIC_BUFFER 0x20040302
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#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
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{ printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
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static int debug = 0;
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module_param(debug, int, 0644);
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MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers");
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MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
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MODULE_LICENSE("GPL");
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#define dprintk(level, fmt, arg...) if (debug >= level) \
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printk(KERN_DEBUG "vbuf: " fmt , ## arg)
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struct scatterlist*
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videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
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{
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struct scatterlist *sglist;
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struct page *pg;
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int i;
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sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
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if (NULL == sglist)
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return NULL;
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memset(sglist,0,sizeof(struct scatterlist)*nr_pages);
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for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
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pg = vmalloc_to_page(virt);
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if (NULL == pg)
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goto err;
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if (PageHighMem(pg))
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BUG();
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sglist[i].page = pg;
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sglist[i].length = PAGE_SIZE;
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}
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return sglist;
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err:
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kfree(sglist);
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return NULL;
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}
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struct scatterlist*
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videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
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{
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struct scatterlist *sglist;
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int i = 0;
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if (NULL == pages[0])
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return NULL;
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sglist = kmalloc(sizeof(*sglist) * nr_pages, GFP_KERNEL);
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if (NULL == sglist)
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return NULL;
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memset(sglist, 0, sizeof(*sglist) * nr_pages);
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if (NULL == pages[0])
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goto nopage;
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if (PageHighMem(pages[0]))
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/* DMA to highmem pages might not work */
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goto highmem;
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sglist[0].page = pages[0];
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sglist[0].offset = offset;
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sglist[0].length = PAGE_SIZE - offset;
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for (i = 1; i < nr_pages; i++) {
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if (NULL == pages[i])
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goto nopage;
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if (PageHighMem(pages[i]))
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goto highmem;
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sglist[i].page = pages[i];
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sglist[i].length = PAGE_SIZE;
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}
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return sglist;
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nopage:
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dprintk(2,"sgl: oops - no page\n");
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kfree(sglist);
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return NULL;
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highmem:
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dprintk(2,"sgl: oops - highmem page\n");
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kfree(sglist);
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return NULL;
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}
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/* --------------------------------------------------------------------- */
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void videobuf_dma_init(struct videobuf_dmabuf *dma)
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{
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memset(dma,0,sizeof(*dma));
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dma->magic = MAGIC_DMABUF;
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}
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int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
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unsigned long data, unsigned long size)
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{
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unsigned long first,last;
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int err, rw = 0;
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dma->direction = direction;
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switch (dma->direction) {
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case PCI_DMA_FROMDEVICE: rw = READ; break;
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case PCI_DMA_TODEVICE: rw = WRITE; break;
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default: BUG();
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}
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first = (data & PAGE_MASK) >> PAGE_SHIFT;
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last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
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dma->offset = data & ~PAGE_MASK;
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dma->nr_pages = last-first+1;
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dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
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GFP_KERNEL);
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if (NULL == dma->pages)
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return -ENOMEM;
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dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
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data,size,dma->nr_pages);
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down_read(¤t->mm->mmap_sem);
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err = get_user_pages(current,current->mm,
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data & PAGE_MASK, dma->nr_pages,
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rw == READ, 1, /* force */
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dma->pages, NULL);
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up_read(¤t->mm->mmap_sem);
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if (err != dma->nr_pages) {
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dma->nr_pages = (err >= 0) ? err : 0;
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dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
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return err < 0 ? err : -EINVAL;
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}
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return 0;
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}
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int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
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int nr_pages)
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{
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dprintk(1,"init kernel [%d pages]\n",nr_pages);
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dma->direction = direction;
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dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
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if (NULL == dma->vmalloc) {
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dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
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return -ENOMEM;
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}
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memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
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dma->nr_pages = nr_pages;
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return 0;
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}
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int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
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dma_addr_t addr, int nr_pages)
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{
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dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
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nr_pages,(unsigned long)addr);
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dma->direction = direction;
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if (0 == addr)
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return -EINVAL;
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dma->bus_addr = addr;
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dma->nr_pages = nr_pages;
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return 0;
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}
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int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma)
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{
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MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
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BUG_ON(0 == dma->nr_pages);
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if (dma->pages) {
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dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
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dma->offset);
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}
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if (dma->vmalloc) {
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dma->sglist = videobuf_vmalloc_to_sg
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(dma->vmalloc,dma->nr_pages);
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}
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if (dma->bus_addr) {
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dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
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if (NULL != dma->sglist) {
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dma->sglen = 1;
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sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
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dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
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sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
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}
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}
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if (NULL == dma->sglist) {
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dprintk(1,"scatterlist is NULL\n");
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return -ENOMEM;
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}
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if (!dma->bus_addr) {
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dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages,
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dma->direction);
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if (0 == dma->sglen) {
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printk(KERN_WARNING
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"%s: pci_map_sg failed\n",__FUNCTION__);
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kfree(dma->sglist);
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dma->sglist = NULL;
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dma->sglen = 0;
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return -EIO;
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}
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}
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return 0;
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}
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int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma)
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{
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MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
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BUG_ON(!dma->sglen);
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if (!dma->bus_addr)
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pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction);
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return 0;
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}
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int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma)
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{
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MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
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if (!dma->sglen)
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return 0;
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if (!dma->bus_addr)
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pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction);
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kfree(dma->sglist);
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dma->sglist = NULL;
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dma->sglen = 0;
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return 0;
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}
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int videobuf_dma_free(struct videobuf_dmabuf *dma)
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{
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MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
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BUG_ON(dma->sglen);
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if (dma->pages) {
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int i;
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for (i=0; i < dma->nr_pages; i++)
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page_cache_release(dma->pages[i]);
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kfree(dma->pages);
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dma->pages = NULL;
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}
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if (dma->vmalloc) {
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vfree(dma->vmalloc);
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dma->vmalloc = NULL;
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}
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if (dma->bus_addr) {
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dma->bus_addr = 0;
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}
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dma->direction = PCI_DMA_NONE;
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return 0;
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}
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/* --------------------------------------------------------------------- */
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void* videobuf_alloc(unsigned int size)
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{
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struct videobuf_buffer *vb;
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vb = kmalloc(size,GFP_KERNEL);
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if (NULL != vb) {
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memset(vb,0,size);
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videobuf_dma_init(&vb->dma);
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init_waitqueue_head(&vb->done);
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vb->magic = MAGIC_BUFFER;
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}
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return vb;
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}
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int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
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{
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int retval = 0;
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DECLARE_WAITQUEUE(wait, current);
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MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
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add_wait_queue(&vb->done, &wait);
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while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
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if (non_blocking) {
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retval = -EAGAIN;
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break;
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}
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set_current_state(intr ? TASK_INTERRUPTIBLE
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: TASK_UNINTERRUPTIBLE);
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if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
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schedule();
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set_current_state(TASK_RUNNING);
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if (intr && signal_pending(current)) {
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dprintk(1,"buffer waiton: -EINTR\n");
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retval = -EINTR;
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break;
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}
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}
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remove_wait_queue(&vb->done, &wait);
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return retval;
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}
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int
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videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb,
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struct v4l2_framebuffer *fbuf)
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{
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int err,pages;
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dma_addr_t bus;
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MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
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switch (vb->memory) {
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case V4L2_MEMORY_MMAP:
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case V4L2_MEMORY_USERPTR:
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if (0 == vb->baddr) {
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/* no userspace addr -- kernel bounce buffer */
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pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
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err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE,
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pages);
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if (0 != err)
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return err;
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} else {
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/* dma directly to userspace */
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err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE,
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vb->baddr,vb->bsize);
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if (0 != err)
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return err;
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}
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break;
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case V4L2_MEMORY_OVERLAY:
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if (NULL == fbuf)
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return -EINVAL;
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/* FIXME: need sanity checks for vb->boff */
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bus = (dma_addr_t)fbuf->base + vb->boff;
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pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
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err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE,
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bus, pages);
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if (0 != err)
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return err;
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break;
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default:
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BUG();
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}
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err = videobuf_dma_pci_map(pci,&vb->dma);
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if (0 != err)
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return err;
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return 0;
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}
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/* --------------------------------------------------------------------- */
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void videobuf_queue_init(struct videobuf_queue* q,
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struct videobuf_queue_ops *ops,
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struct pci_dev *pci,
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spinlock_t *irqlock,
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enum v4l2_buf_type type,
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enum v4l2_field field,
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unsigned int msize,
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void *priv)
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{
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memset(q,0,sizeof(*q));
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q->irqlock = irqlock;
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q->pci = pci;
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q->type = type;
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q->field = field;
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q->msize = msize;
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q->ops = ops;
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q->priv_data = priv;
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init_MUTEX(&q->lock);
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INIT_LIST_HEAD(&q->stream);
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}
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int
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videobuf_queue_is_busy(struct videobuf_queue *q)
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{
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int i;
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if (q->streaming) {
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dprintk(1,"busy: streaming active\n");
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return 1;
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}
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if (q->reading) {
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dprintk(1,"busy: pending read #1\n");
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return 1;
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}
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if (q->read_buf) {
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dprintk(1,"busy: pending read #2\n");
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return 1;
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}
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for (i = 0; i < VIDEO_MAX_FRAME; i++) {
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if (NULL == q->bufs[i])
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continue;
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if (q->bufs[i]->map) {
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dprintk(1,"busy: buffer #%d mapped\n",i);
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return 1;
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}
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if (q->bufs[i]->state == STATE_QUEUED) {
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dprintk(1,"busy: buffer #%d queued\n",i);
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return 1;
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}
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if (q->bufs[i]->state == STATE_ACTIVE) {
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dprintk(1,"busy: buffer #%d avtive\n",i);
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return 1;
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}
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}
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return 0;
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}
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void
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videobuf_queue_cancel(struct videobuf_queue *q)
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{
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unsigned long flags;
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int i;
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/* remove queued buffers from list */
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spin_lock_irqsave(q->irqlock,flags);
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for (i = 0; i < VIDEO_MAX_FRAME; i++) {
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if (NULL == q->bufs[i])
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continue;
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if (q->bufs[i]->state == STATE_QUEUED) {
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list_del(&q->bufs[i]->queue);
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q->bufs[i]->state = STATE_ERROR;
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}
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}
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spin_unlock_irqrestore(q->irqlock,flags);
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/* free all buffers + clear queue */
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for (i = 0; i < VIDEO_MAX_FRAME; i++) {
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if (NULL == q->bufs[i])
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continue;
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q->ops->buf_release(q,q->bufs[i]);
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}
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INIT_LIST_HEAD(&q->stream);
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}
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/* --------------------------------------------------------------------- */
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enum v4l2_field
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videobuf_next_field(struct videobuf_queue *q)
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{
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enum v4l2_field field = q->field;
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BUG_ON(V4L2_FIELD_ANY == field);
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if (V4L2_FIELD_ALTERNATE == field) {
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if (V4L2_FIELD_TOP == q->last) {
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field = V4L2_FIELD_BOTTOM;
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q->last = V4L2_FIELD_BOTTOM;
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} else {
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field = V4L2_FIELD_TOP;
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q->last = V4L2_FIELD_TOP;
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}
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}
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return field;
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}
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void
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videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb,
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enum v4l2_buf_type type)
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{
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MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
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b->index = vb->i;
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b->type = type;
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b->memory = vb->memory;
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switch (b->memory) {
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case V4L2_MEMORY_MMAP:
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b->m.offset = vb->boff;
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b->length = vb->bsize;
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break;
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case V4L2_MEMORY_USERPTR:
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b->m.userptr = vb->baddr;
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b->length = vb->bsize;
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break;
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case V4L2_MEMORY_OVERLAY:
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b->m.offset = vb->boff;
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break;
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}
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b->flags = 0;
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if (vb->map)
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b->flags |= V4L2_BUF_FLAG_MAPPED;
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|
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switch (vb->state) {
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case STATE_PREPARED:
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case STATE_QUEUED:
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case STATE_ACTIVE:
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b->flags |= V4L2_BUF_FLAG_QUEUED;
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break;
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case STATE_DONE:
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case STATE_ERROR:
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|
b->flags |= V4L2_BUF_FLAG_DONE;
|
|
break;
|
|
case STATE_NEEDS_INIT:
|
|
case STATE_IDLE:
|
|
/* nothing */
|
|
break;
|
|
}
|
|
|
|
if (vb->input != UNSET) {
|
|
b->flags |= V4L2_BUF_FLAG_INPUT;
|
|
b->input = vb->input;
|
|
}
|
|
|
|
b->field = vb->field;
|
|
b->timestamp = vb->ts;
|
|
b->bytesused = vb->size;
|
|
b->sequence = vb->field_count >> 1;
|
|
}
|
|
|
|
int
|
|
videobuf_reqbufs(struct videobuf_queue *q,
|
|
struct v4l2_requestbuffers *req)
|
|
{
|
|
unsigned int size,count;
|
|
int retval;
|
|
|
|
if (req->type != q->type)
|
|
return -EINVAL;
|
|
if (req->count < 1)
|
|
return -EINVAL;
|
|
if (req->memory != V4L2_MEMORY_MMAP &&
|
|
req->memory != V4L2_MEMORY_USERPTR &&
|
|
req->memory != V4L2_MEMORY_OVERLAY)
|
|
return -EINVAL;
|
|
|
|
if (q->streaming)
|
|
return -EBUSY;
|
|
if (!list_empty(&q->stream))
|
|
return -EBUSY;
|
|
|
|
down(&q->lock);
|
|
count = req->count;
|
|
if (count > VIDEO_MAX_FRAME)
|
|
count = VIDEO_MAX_FRAME;
|
|
size = 0;
|
|
q->ops->buf_setup(q,&count,&size);
|
|
size = PAGE_ALIGN(size);
|
|
dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
|
|
count, size, (count*size)>>PAGE_SHIFT);
|
|
|
|
retval = videobuf_mmap_setup(q,count,size,req->memory);
|
|
if (retval < 0)
|
|
goto done;
|
|
|
|
req->count = count;
|
|
|
|
done:
|
|
up(&q->lock);
|
|
return retval;
|
|
}
|
|
|
|
int
|
|
videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
|
|
{
|
|
if (unlikely(b->type != q->type))
|
|
return -EINVAL;
|
|
if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME))
|
|
return -EINVAL;
|
|
if (unlikely(NULL == q->bufs[b->index]))
|
|
return -EINVAL;
|
|
videobuf_status(b,q->bufs[b->index],q->type);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
videobuf_qbuf(struct videobuf_queue *q,
|
|
struct v4l2_buffer *b)
|
|
{
|
|
struct videobuf_buffer *buf;
|
|
enum v4l2_field field;
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
down(&q->lock);
|
|
retval = -EBUSY;
|
|
if (q->reading)
|
|
goto done;
|
|
retval = -EINVAL;
|
|
if (b->type != q->type)
|
|
goto done;
|
|
if (b->index < 0 || b->index >= VIDEO_MAX_FRAME)
|
|
goto done;
|
|
buf = q->bufs[b->index];
|
|
if (NULL == buf)
|
|
goto done;
|
|
MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
|
|
if (buf->memory != b->memory)
|
|
goto done;
|
|
if (buf->state == STATE_QUEUED ||
|
|
buf->state == STATE_ACTIVE)
|
|
goto done;
|
|
|
|
if (b->flags & V4L2_BUF_FLAG_INPUT) {
|
|
if (b->input >= q->inputs)
|
|
goto done;
|
|
buf->input = b->input;
|
|
} else {
|
|
buf->input = UNSET;
|
|
}
|
|
|
|
switch (b->memory) {
|
|
case V4L2_MEMORY_MMAP:
|
|
if (0 == buf->baddr)
|
|
goto done;
|
|
break;
|
|
case V4L2_MEMORY_USERPTR:
|
|
if (b->length < buf->bsize)
|
|
goto done;
|
|
if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
|
|
q->ops->buf_release(q,buf);
|
|
buf->baddr = b->m.userptr;
|
|
break;
|
|
case V4L2_MEMORY_OVERLAY:
|
|
buf->boff = b->m.offset;
|
|
break;
|
|
default:
|
|
goto done;
|
|
}
|
|
|
|
field = videobuf_next_field(q);
|
|
retval = q->ops->buf_prepare(q,buf,field);
|
|
if (0 != retval)
|
|
goto done;
|
|
|
|
list_add_tail(&buf->stream,&q->stream);
|
|
if (q->streaming) {
|
|
spin_lock_irqsave(q->irqlock,flags);
|
|
q->ops->buf_queue(q,buf);
|
|
spin_unlock_irqrestore(q->irqlock,flags);
|
|
}
|
|
retval = 0;
|
|
|
|
done:
|
|
up(&q->lock);
|
|
return retval;
|
|
}
|
|
|
|
int
|
|
videobuf_dqbuf(struct videobuf_queue *q,
|
|
struct v4l2_buffer *b, int nonblocking)
|
|
{
|
|
struct videobuf_buffer *buf;
|
|
int retval;
|
|
|
|
down(&q->lock);
|
|
retval = -EBUSY;
|
|
if (q->reading)
|
|
goto done;
|
|
retval = -EINVAL;
|
|
if (b->type != q->type)
|
|
goto done;
|
|
if (list_empty(&q->stream))
|
|
goto done;
|
|
buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
|
|
retval = videobuf_waiton(buf, nonblocking, 1);
|
|
if (retval < 0)
|
|
goto done;
|
|
switch (buf->state) {
|
|
case STATE_ERROR:
|
|
retval = -EIO;
|
|
/* fall through */
|
|
case STATE_DONE:
|
|
videobuf_dma_pci_sync(q->pci,&buf->dma);
|
|
buf->state = STATE_IDLE;
|
|
break;
|
|
default:
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
list_del(&buf->stream);
|
|
memset(b,0,sizeof(*b));
|
|
videobuf_status(b,buf,q->type);
|
|
|
|
done:
|
|
up(&q->lock);
|
|
return retval;
|
|
}
|
|
|
|
int videobuf_streamon(struct videobuf_queue *q)
|
|
{
|
|
struct videobuf_buffer *buf;
|
|
struct list_head *list;
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
down(&q->lock);
|
|
retval = -EBUSY;
|
|
if (q->reading)
|
|
goto done;
|
|
retval = 0;
|
|
if (q->streaming)
|
|
goto done;
|
|
q->streaming = 1;
|
|
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);
|
|
|
|
done:
|
|
up(&q->lock);
|
|
return retval;
|
|
}
|
|
|
|
int videobuf_streamoff(struct videobuf_queue *q)
|
|
{
|
|
int retval = -EINVAL;
|
|
|
|
down(&q->lock);
|
|
if (!q->streaming)
|
|
goto done;
|
|
videobuf_queue_cancel(q);
|
|
q->streaming = 0;
|
|
retval = 0;
|
|
|
|
done:
|
|
up(&q->lock);
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t
|
|
videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
enum v4l2_field field;
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
/* setup stuff */
|
|
retval = -ENOMEM;
|
|
q->read_buf = videobuf_alloc(q->msize);
|
|
if (NULL == q->read_buf)
|
|
goto done;
|
|
|
|
q->read_buf->memory = V4L2_MEMORY_USERPTR;
|
|
q->read_buf->baddr = (unsigned long)data;
|
|
q->read_buf->bsize = count;
|
|
field = videobuf_next_field(q);
|
|
retval = q->ops->buf_prepare(q,q->read_buf,field);
|
|
if (0 != retval)
|
|
goto done;
|
|
|
|
/* start capture & wait */
|
|
spin_lock_irqsave(q->irqlock,flags);
|
|
q->ops->buf_queue(q,q->read_buf);
|
|
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);
|
|
if (STATE_ERROR == q->read_buf->state)
|
|
retval = -EIO;
|
|
else
|
|
retval = q->read_buf->size;
|
|
}
|
|
|
|
done:
|
|
/* cleanup */
|
|
q->ops->buf_release(q,q->read_buf);
|
|
kfree(q->read_buf);
|
|
q->read_buf = NULL;
|
|
return retval;
|
|
}
|
|
|
|
ssize_t videobuf_read_one(struct videobuf_queue *q,
|
|
char __user *data, size_t count, loff_t *ppos,
|
|
int nonblocking)
|
|
{
|
|
enum v4l2_field field;
|
|
unsigned long flags;
|
|
unsigned size, nbufs, bytes;
|
|
int retval;
|
|
|
|
down(&q->lock);
|
|
|
|
nbufs = 1; size = 0;
|
|
q->ops->buf_setup(q,&nbufs,&size);
|
|
if (NULL == q->read_buf &&
|
|
count >= size &&
|
|
!nonblocking) {
|
|
retval = videobuf_read_zerocopy(q,data,count,ppos);
|
|
if (retval >= 0 || retval == -EIO)
|
|
/* ok, all done */
|
|
goto done;
|
|
/* fallback to kernel bounce buffer on failures */
|
|
}
|
|
|
|
if (NULL == q->read_buf) {
|
|
/* need to capture a new frame */
|
|
retval = -ENOMEM;
|
|
q->read_buf = videobuf_alloc(q->msize);
|
|
if (NULL == q->read_buf)
|
|
goto done;
|
|
q->read_buf->memory = V4L2_MEMORY_USERPTR;
|
|
field = videobuf_next_field(q);
|
|
retval = q->ops->buf_prepare(q,q->read_buf,field);
|
|
if (0 != retval)
|
|
goto done;
|
|
spin_lock_irqsave(q->irqlock,flags);
|
|
q->ops->buf_queue(q,q->read_buf);
|
|
spin_unlock_irqrestore(q->irqlock,flags);
|
|
q->read_off = 0;
|
|
}
|
|
|
|
/* wait until capture is done */
|
|
retval = videobuf_waiton(q->read_buf, nonblocking, 1);
|
|
if (0 != retval)
|
|
goto done;
|
|
videobuf_dma_pci_sync(q->pci,&q->read_buf->dma);
|
|
|
|
if (STATE_ERROR == q->read_buf->state) {
|
|
/* catch I/O errors */
|
|
q->ops->buf_release(q,q->read_buf);
|
|
kfree(q->read_buf);
|
|
q->read_buf = NULL;
|
|
retval = -EIO;
|
|
goto done;
|
|
}
|
|
|
|
/* copy to userspace */
|
|
bytes = count;
|
|
if (bytes > q->read_buf->size - q->read_off)
|
|
bytes = q->read_buf->size - q->read_off;
|
|
retval = -EFAULT;
|
|
if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes))
|
|
goto done;
|
|
|
|
retval = bytes;
|
|
q->read_off += bytes;
|
|
if (q->read_off == q->read_buf->size) {
|
|
/* all data copied, cleanup */
|
|
q->ops->buf_release(q,q->read_buf);
|
|
kfree(q->read_buf);
|
|
q->read_buf = NULL;
|
|
}
|
|
|
|
done:
|
|
up(&q->lock);
|
|
return retval;
|
|
}
|
|
|
|
int videobuf_read_start(struct videobuf_queue *q)
|
|
{
|
|
enum v4l2_field field;
|
|
unsigned long flags;
|
|
int count = 0, size = 0;
|
|
int err, i;
|
|
|
|
q->ops->buf_setup(q,&count,&size);
|
|
if (count < 2)
|
|
count = 2;
|
|
if (count > VIDEO_MAX_FRAME)
|
|
count = VIDEO_MAX_FRAME;
|
|
size = PAGE_ALIGN(size);
|
|
|
|
err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
|
|
if (err)
|
|
return err;
|
|
for (i = 0; i < count; i++) {
|
|
field = videobuf_next_field(q);
|
|
err = q->ops->buf_prepare(q,q->bufs[i],field);
|
|
if (err)
|
|
return err;
|
|
list_add_tail(&q->bufs[i]->stream, &q->stream);
|
|
}
|
|
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);
|
|
q->reading = 1;
|
|
return 0;
|
|
}
|
|
|
|
void videobuf_read_stop(struct videobuf_queue *q)
|
|
{
|
|
int i;
|
|
|
|
videobuf_queue_cancel(q);
|
|
videobuf_mmap_free(q);
|
|
INIT_LIST_HEAD(&q->stream);
|
|
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
|
|
if (NULL == q->bufs[i])
|
|
continue;
|
|
kfree(q->bufs[i]);
|
|
q->bufs[i] = NULL;
|
|
}
|
|
q->read_buf = NULL;
|
|
q->reading = 0;
|
|
}
|
|
|
|
ssize_t videobuf_read_stream(struct videobuf_queue *q,
|
|
char __user *data, size_t count, loff_t *ppos,
|
|
int vbihack, int nonblocking)
|
|
{
|
|
unsigned int *fc, bytes;
|
|
int err, retval;
|
|
unsigned long flags;
|
|
|
|
dprintk(2,"%s\n",__FUNCTION__);
|
|
down(&q->lock);
|
|
retval = -EBUSY;
|
|
if (q->streaming)
|
|
goto done;
|
|
if (!q->reading) {
|
|
retval = videobuf_read_start(q);
|
|
if (retval < 0)
|
|
goto done;
|
|
}
|
|
|
|
retval = 0;
|
|
while (count > 0) {
|
|
/* get / wait for data */
|
|
if (NULL == q->read_buf) {
|
|
q->read_buf = list_entry(q->stream.next,
|
|
struct videobuf_buffer,
|
|
stream);
|
|
list_del(&q->read_buf->stream);
|
|
q->read_off = 0;
|
|
}
|
|
err = videobuf_waiton(q->read_buf, nonblocking, 1);
|
|
if (err < 0) {
|
|
if (0 == retval)
|
|
retval = err;
|
|
break;
|
|
}
|
|
|
|
if (q->read_buf->state == STATE_DONE) {
|
|
if (vbihack) {
|
|
/* dirty, undocumented hack -- pass the frame counter
|
|
* within the last four bytes of each vbi data block.
|
|
* We need that one to maintain backward compatibility
|
|
* to all vbi decoding software out there ... */
|
|
fc = (unsigned int*)q->read_buf->dma.vmalloc;
|
|
fc += (q->read_buf->size>>2) -1;
|
|
*fc = q->read_buf->field_count >> 1;
|
|
dprintk(1,"vbihack: %d\n",*fc);
|
|
}
|
|
|
|
/* copy stuff */
|
|
bytes = count;
|
|
if (bytes > q->read_buf->size - q->read_off)
|
|
bytes = q->read_buf->size - q->read_off;
|
|
if (copy_to_user(data + retval,
|
|
q->read_buf->dma.vmalloc + q->read_off,
|
|
bytes)) {
|
|
if (0 == retval)
|
|
retval = -EFAULT;
|
|
break;
|
|
}
|
|
count -= bytes;
|
|
retval += bytes;
|
|
q->read_off += bytes;
|
|
} else {
|
|
/* some error */
|
|
q->read_off = q->read_buf->size;
|
|
if (0 == retval)
|
|
retval = -EIO;
|
|
}
|
|
|
|
/* requeue buffer when done with copying */
|
|
if (q->read_off == q->read_buf->size) {
|
|
list_add_tail(&q->read_buf->stream,
|
|
&q->stream);
|
|
spin_lock_irqsave(q->irqlock,flags);
|
|
q->ops->buf_queue(q,q->read_buf);
|
|
spin_unlock_irqrestore(q->irqlock,flags);
|
|
q->read_buf = NULL;
|
|
}
|
|
if (retval < 0)
|
|
break;
|
|
}
|
|
|
|
done:
|
|
up(&q->lock);
|
|
return retval;
|
|
}
|
|
|
|
unsigned int videobuf_poll_stream(struct file *file,
|
|
struct videobuf_queue *q,
|
|
poll_table *wait)
|
|
{
|
|
struct videobuf_buffer *buf = NULL;
|
|
unsigned int rc = 0;
|
|
|
|
down(&q->lock);
|
|
if (q->streaming) {
|
|
if (!list_empty(&q->stream))
|
|
buf = list_entry(q->stream.next,
|
|
struct videobuf_buffer, stream);
|
|
} else {
|
|
if (!q->reading)
|
|
videobuf_read_start(q);
|
|
if (!q->reading) {
|
|
rc = POLLERR;
|
|
} else if (NULL == q->read_buf) {
|
|
q->read_buf = list_entry(q->stream.next,
|
|
struct videobuf_buffer,
|
|
stream);
|
|
list_del(&q->read_buf->stream);
|
|
q->read_off = 0;
|
|
}
|
|
buf = q->read_buf;
|
|
}
|
|
if (!buf)
|
|
rc = POLLERR;
|
|
|
|
if (0 == rc) {
|
|
poll_wait(file, &buf->done, wait);
|
|
if (buf->state == STATE_DONE ||
|
|
buf->state == STATE_ERROR)
|
|
rc = POLLIN|POLLRDNORM;
|
|
}
|
|
up(&q->lock);
|
|
return rc;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
static void
|
|
videobuf_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct videobuf_mapping *map = vma->vm_private_data;
|
|
|
|
dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
|
|
map->count,vma->vm_start,vma->vm_end);
|
|
map->count++;
|
|
}
|
|
|
|
static void
|
|
videobuf_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct videobuf_mapping *map = vma->vm_private_data;
|
|
struct videobuf_queue *q = map->q;
|
|
int i;
|
|
|
|
dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
|
|
map->count,vma->vm_start,vma->vm_end);
|
|
|
|
map->count--;
|
|
if (0 == map->count) {
|
|
dprintk(1,"munmap %p q=%p\n",map,q);
|
|
down(&q->lock);
|
|
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
|
|
if (NULL == q->bufs[i])
|
|
continue;
|
|
if (q->bufs[i])
|
|
;
|
|
if (q->bufs[i]->map != map)
|
|
continue;
|
|
q->bufs[i]->map = NULL;
|
|
q->bufs[i]->baddr = 0;
|
|
q->ops->buf_release(q,q->bufs[i]);
|
|
}
|
|
up(&q->lock);
|
|
kfree(map);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Get a anonymous page for the mapping. Make sure we can DMA to that
|
|
* memory location with 32bit PCI devices (i.e. don't use highmem for
|
|
* now ...). Bounce buffers don't work very well for the data rates
|
|
* video capture has.
|
|
*/
|
|
static struct page*
|
|
videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
|
|
int *type)
|
|
{
|
|
struct page *page;
|
|
|
|
dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
|
|
vaddr,vma->vm_start,vma->vm_end);
|
|
if (vaddr > vma->vm_end)
|
|
return NOPAGE_SIGBUS;
|
|
page = alloc_page(GFP_USER);
|
|
if (!page)
|
|
return NOPAGE_OOM;
|
|
clear_user_page(page_address(page), vaddr, page);
|
|
if (type)
|
|
*type = VM_FAULT_MINOR;
|
|
return page;
|
|
}
|
|
|
|
static struct vm_operations_struct videobuf_vm_ops =
|
|
{
|
|
.open = videobuf_vm_open,
|
|
.close = videobuf_vm_close,
|
|
.nopage = videobuf_vm_nopage,
|
|
};
|
|
|
|
int videobuf_mmap_setup(struct videobuf_queue *q,
|
|
unsigned int bcount, unsigned int bsize,
|
|
enum v4l2_memory memory)
|
|
{
|
|
unsigned int i;
|
|
int err;
|
|
|
|
err = videobuf_mmap_free(q);
|
|
if (0 != err)
|
|
return err;
|
|
|
|
for (i = 0; i < bcount; i++) {
|
|
q->bufs[i] = videobuf_alloc(q->msize);
|
|
q->bufs[i]->i = i;
|
|
q->bufs[i]->input = UNSET;
|
|
q->bufs[i]->memory = memory;
|
|
q->bufs[i]->bsize = bsize;
|
|
switch (memory) {
|
|
case V4L2_MEMORY_MMAP:
|
|
q->bufs[i]->boff = bsize * i;
|
|
break;
|
|
case V4L2_MEMORY_USERPTR:
|
|
case V4L2_MEMORY_OVERLAY:
|
|
/* nothing */
|
|
break;
|
|
}
|
|
}
|
|
dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
|
|
bcount,bsize);
|
|
return 0;
|
|
}
|
|
|
|
int videobuf_mmap_free(struct videobuf_queue *q)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < VIDEO_MAX_FRAME; i++)
|
|
if (q->bufs[i] && q->bufs[i]->map)
|
|
return -EBUSY;
|
|
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
|
|
if (NULL == q->bufs[i])
|
|
continue;
|
|
q->ops->buf_release(q,q->bufs[i]);
|
|
kfree(q->bufs[i]);
|
|
q->bufs[i] = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int videobuf_mmap_mapper(struct videobuf_queue *q,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct videobuf_mapping *map;
|
|
unsigned int first,last,size,i;
|
|
int retval;
|
|
|
|
down(&q->lock);
|
|
retval = -EINVAL;
|
|
if (!(vma->vm_flags & VM_WRITE)) {
|
|
dprintk(1,"mmap app bug: PROT_WRITE please\n");
|
|
goto done;
|
|
}
|
|
if (!(vma->vm_flags & VM_SHARED)) {
|
|
dprintk(1,"mmap app bug: MAP_SHARED please\n");
|
|
goto done;
|
|
}
|
|
|
|
/* look for first buffer to map */
|
|
for (first = 0; first < VIDEO_MAX_FRAME; first++) {
|
|
if (NULL == q->bufs[first])
|
|
continue;
|
|
if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
|
|
continue;
|
|
if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
|
|
break;
|
|
}
|
|
if (VIDEO_MAX_FRAME == first) {
|
|
dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
|
|
(vma->vm_pgoff << PAGE_SHIFT));
|
|
goto done;
|
|
}
|
|
|
|
/* look for last buffer to map */
|
|
for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
|
|
if (NULL == q->bufs[last])
|
|
continue;
|
|
if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
|
|
continue;
|
|
if (q->bufs[last]->map) {
|
|
retval = -EBUSY;
|
|
goto done;
|
|
}
|
|
size += q->bufs[last]->bsize;
|
|
if (size == (vma->vm_end - vma->vm_start))
|
|
break;
|
|
}
|
|
if (VIDEO_MAX_FRAME == last) {
|
|
dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
|
|
(vma->vm_end - vma->vm_start));
|
|
goto done;
|
|
}
|
|
|
|
/* create mapping + update buffer list */
|
|
retval = -ENOMEM;
|
|
map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
|
|
if (NULL == map)
|
|
goto done;
|
|
for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
|
|
q->bufs[i]->map = map;
|
|
q->bufs[i]->baddr = vma->vm_start + size;
|
|
}
|
|
map->count = 1;
|
|
map->start = vma->vm_start;
|
|
map->end = vma->vm_end;
|
|
map->q = q;
|
|
vma->vm_ops = &videobuf_vm_ops;
|
|
vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
|
|
vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
|
|
vma->vm_private_data = map;
|
|
dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
|
|
map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
|
|
retval = 0;
|
|
|
|
done:
|
|
up(&q->lock);
|
|
return retval;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
|
|
|
|
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_free);
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_alloc);
|
|
EXPORT_SYMBOL_GPL(videobuf_waiton);
|
|
EXPORT_SYMBOL_GPL(videobuf_iolock);
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_queue_init);
|
|
EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
|
|
EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_next_field);
|
|
EXPORT_SYMBOL_GPL(videobuf_status);
|
|
EXPORT_SYMBOL_GPL(videobuf_reqbufs);
|
|
EXPORT_SYMBOL_GPL(videobuf_querybuf);
|
|
EXPORT_SYMBOL_GPL(videobuf_qbuf);
|
|
EXPORT_SYMBOL_GPL(videobuf_dqbuf);
|
|
EXPORT_SYMBOL_GPL(videobuf_streamon);
|
|
EXPORT_SYMBOL_GPL(videobuf_streamoff);
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_read_start);
|
|
EXPORT_SYMBOL_GPL(videobuf_read_stop);
|
|
EXPORT_SYMBOL_GPL(videobuf_read_stream);
|
|
EXPORT_SYMBOL_GPL(videobuf_read_one);
|
|
EXPORT_SYMBOL_GPL(videobuf_poll_stream);
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
|
|
EXPORT_SYMBOL_GPL(videobuf_mmap_free);
|
|
EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|