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685 lines
16 KiB
685 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* helper functions for SG DMA video4linux capture buffers |
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* |
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* The functions expect the hardware being able to scatter gather |
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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. |
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* |
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* (c) 2007 Mauro Carvalho Chehab, <[email protected]> |
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* |
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* Highly based on video-buf written originally by: |
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* (c) 2001,02 Gerd Knorr <[email protected]> |
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* (c) 2006 Mauro Carvalho Chehab, <[email protected]> |
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* (c) 2006 Ted Walther and John Sokol |
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*/ |
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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/sched/mm.h> |
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#include <linux/slab.h> |
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#include <linux/interrupt.h> |
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#include <linux/pgtable.h> |
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|
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#include <linux/dma-mapping.h> |
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#include <linux/vmalloc.h> |
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#include <linux/pagemap.h> |
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#include <linux/scatterlist.h> |
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#include <asm/page.h> |
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#include <media/videobuf-dma-sg.h> |
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|
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#define MAGIC_DMABUF 0x19721112 |
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#define MAGIC_SG_MEM 0x17890714 |
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|
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#define MAGIC_CHECK(is, should) \ |
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if (unlikely((is) != (should))) { \ |
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printk(KERN_ERR "magic mismatch: %x (expected %x)\n", \ |
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is, should); \ |
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BUG(); \ |
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} |
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|
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static int debug; |
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module_param(debug, int, 0644); |
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|
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MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers"); |
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MODULE_AUTHOR("Mauro Carvalho Chehab <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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|
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#define dprintk(level, fmt, arg...) \ |
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if (debug >= level) \ |
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printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg) |
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|
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/* --------------------------------------------------------------------- */ |
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|
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/* |
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* Return a scatterlist for some page-aligned vmalloc()'ed memory |
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* block (NULL on errors). Memory for the scatterlist is allocated |
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* using kmalloc. The caller must free the memory. |
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*/ |
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static struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt, |
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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 = vzalloc(array_size(nr_pages, sizeof(*sglist))); |
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if (NULL == sglist) |
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return NULL; |
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sg_init_table(sglist, 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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BUG_ON(PageHighMem(pg)); |
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sg_set_page(&sglist[i], pg, PAGE_SIZE, 0); |
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} |
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return sglist; |
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err: |
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vfree(sglist); |
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return NULL; |
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} |
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/* |
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* Return a scatterlist for a an array of userpages (NULL on errors). |
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* Memory for the scatterlist is allocated using kmalloc. The caller |
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* must free the memory. |
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*/ |
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static struct scatterlist *videobuf_pages_to_sg(struct page **pages, |
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int nr_pages, int offset, size_t size) |
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{ |
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struct scatterlist *sglist; |
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int i; |
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|
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if (NULL == pages[0]) |
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return NULL; |
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sglist = vmalloc(array_size(nr_pages, sizeof(*sglist))); |
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if (NULL == sglist) |
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return NULL; |
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sg_init_table(sglist, nr_pages); |
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|
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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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sg_set_page(&sglist[0], pages[0], |
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min_t(size_t, PAGE_SIZE - offset, size), offset); |
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size -= min_t(size_t, PAGE_SIZE - offset, size); |
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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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sg_set_page(&sglist[i], pages[i], min_t(size_t, PAGE_SIZE, size), 0); |
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size -= min_t(size_t, PAGE_SIZE, 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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vfree(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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vfree(sglist); |
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return NULL; |
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} |
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/* --------------------------------------------------------------------- */ |
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struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf) |
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{ |
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struct videobuf_dma_sg_memory *mem = buf->priv; |
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BUG_ON(!mem); |
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MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
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return &mem->dma; |
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} |
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EXPORT_SYMBOL_GPL(videobuf_to_dma); |
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static 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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static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, |
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int direction, 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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unsigned int flags = FOLL_FORCE; |
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dma->direction = direction; |
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switch (dma->direction) { |
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case DMA_FROM_DEVICE: |
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rw = READ; |
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break; |
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case DMA_TO_DEVICE: |
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rw = WRITE; |
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break; |
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default: |
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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->size = size; |
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dma->nr_pages = last-first+1; |
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dma->pages = kmalloc_array(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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if (rw == READ) |
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flags |= FOLL_WRITE; |
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dprintk(1, "init user [0x%lx+0x%lx => %lu pages]\n", |
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data, size, dma->nr_pages); |
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err = pin_user_pages(data & PAGE_MASK, dma->nr_pages, |
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flags | FOLL_LONGTERM, dma->pages, NULL); |
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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, "pin_user_pages: err=%d [%lu]\n", err, |
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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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static 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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int ret; |
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mmap_read_lock(current->mm); |
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ret = videobuf_dma_init_user_locked(dma, direction, data, size); |
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mmap_read_unlock(current->mm); |
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return ret; |
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} |
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static int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
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unsigned long nr_pages) |
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{ |
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int i; |
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dprintk(1, "init kernel [%lu pages]\n", nr_pages); |
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dma->direction = direction; |
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dma->vaddr_pages = kcalloc(nr_pages, sizeof(*dma->vaddr_pages), |
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GFP_KERNEL); |
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if (!dma->vaddr_pages) |
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return -ENOMEM; |
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dma->dma_addr = kcalloc(nr_pages, sizeof(*dma->dma_addr), GFP_KERNEL); |
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if (!dma->dma_addr) { |
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kfree(dma->vaddr_pages); |
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return -ENOMEM; |
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} |
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for (i = 0; i < nr_pages; i++) { |
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void *addr; |
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addr = dma_alloc_coherent(dma->dev, PAGE_SIZE, |
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&(dma->dma_addr[i]), GFP_KERNEL); |
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if (addr == NULL) |
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goto out_free_pages; |
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dma->vaddr_pages[i] = virt_to_page(addr); |
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} |
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dma->vaddr = vmap(dma->vaddr_pages, nr_pages, VM_MAP | VM_IOREMAP, |
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PAGE_KERNEL); |
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if (NULL == dma->vaddr) { |
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dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages); |
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goto out_free_pages; |
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} |
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dprintk(1, "vmalloc is at addr %p, size=%lu\n", |
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dma->vaddr, nr_pages << PAGE_SHIFT); |
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memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT); |
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dma->nr_pages = nr_pages; |
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return 0; |
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out_free_pages: |
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while (i > 0) { |
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void *addr; |
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i--; |
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addr = page_address(dma->vaddr_pages[i]); |
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dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]); |
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} |
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kfree(dma->dma_addr); |
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dma->dma_addr = NULL; |
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kfree(dma->vaddr_pages); |
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dma->vaddr_pages = NULL; |
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return -ENOMEM; |
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} |
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static int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, |
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dma_addr_t addr, unsigned long nr_pages) |
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{ |
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dprintk(1, "init overlay [%lu 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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static int videobuf_dma_map(struct device *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, dma->size); |
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} |
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if (dma->vaddr) { |
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dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr, |
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dma->nr_pages); |
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} |
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if (dma->bus_addr) { |
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dma->sglist = vmalloc(sizeof(*dma->sglist)); |
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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 |
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& 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 = dma_map_sg(dev, dma->sglist, |
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dma->nr_pages, dma->direction); |
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if (0 == dma->sglen) { |
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printk(KERN_WARNING |
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"%s: videobuf_map_sg failed\n", __func__); |
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vfree(dma->sglist); |
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dma->sglist = NULL; |
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dma->sglen = 0; |
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return -ENOMEM; |
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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_unmap(struct device *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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dma_unmap_sg(dev, dma->sglist, dma->nr_pages, dma->direction); |
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vfree(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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EXPORT_SYMBOL_GPL(videobuf_dma_unmap); |
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int videobuf_dma_free(struct videobuf_dmabuf *dma) |
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{ |
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int i; |
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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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unpin_user_pages_dirty_lock(dma->pages, dma->nr_pages, |
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dma->direction == DMA_FROM_DEVICE); |
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kfree(dma->pages); |
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dma->pages = NULL; |
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} |
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if (dma->dma_addr) { |
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for (i = 0; i < dma->nr_pages; i++) { |
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void *addr; |
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addr = page_address(dma->vaddr_pages[i]); |
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dma_free_coherent(dma->dev, PAGE_SIZE, addr, |
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dma->dma_addr[i]); |
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} |
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kfree(dma->dma_addr); |
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dma->dma_addr = NULL; |
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kfree(dma->vaddr_pages); |
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dma->vaddr_pages = NULL; |
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vunmap(dma->vaddr); |
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dma->vaddr = 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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dma->direction = DMA_NONE; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(videobuf_dma_free); |
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/* --------------------------------------------------------------------- */ |
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static void videobuf_vm_open(struct vm_area_struct *vma) |
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{ |
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struct videobuf_mapping *map = vma->vm_private_data; |
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dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map, |
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map->count, vma->vm_start, vma->vm_end); |
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map->count++; |
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} |
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static void videobuf_vm_close(struct vm_area_struct *vma) |
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{ |
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struct videobuf_mapping *map = vma->vm_private_data; |
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struct videobuf_queue *q = map->q; |
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struct videobuf_dma_sg_memory *mem; |
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int i; |
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dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map, |
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map->count, vma->vm_start, vma->vm_end); |
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map->count--; |
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if (0 == map->count) { |
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dprintk(1, "munmap %p q=%p\n", map, q); |
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videobuf_queue_lock(q); |
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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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mem = q->bufs[i]->priv; |
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if (!mem) |
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continue; |
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MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
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if (q->bufs[i]->map != map) |
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continue; |
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q->bufs[i]->map = NULL; |
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q->bufs[i]->baddr = 0; |
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q->ops->buf_release(q, q->bufs[i]); |
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} |
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videobuf_queue_unlock(q); |
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kfree(map); |
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} |
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} |
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/* |
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* Get a anonymous page for the mapping. Make sure we can DMA to that |
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* memory location with 32bit PCI devices (i.e. don't use highmem for |
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* now ...). Bounce buffers don't work very well for the data rates |
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* video capture has. |
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*/ |
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static vm_fault_t videobuf_vm_fault(struct vm_fault *vmf) |
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{ |
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struct vm_area_struct *vma = vmf->vma; |
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struct page *page; |
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dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n", |
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vmf->address, vma->vm_start, vma->vm_end); |
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page = alloc_page(GFP_USER | __GFP_DMA32); |
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if (!page) |
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return VM_FAULT_OOM; |
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clear_user_highpage(page, vmf->address); |
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vmf->page = page; |
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return 0; |
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} |
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static const struct vm_operations_struct videobuf_vm_ops = { |
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.open = videobuf_vm_open, |
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.close = videobuf_vm_close, |
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.fault = videobuf_vm_fault, |
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}; |
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|
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/* --------------------------------------------------------------------- |
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* SG handlers for the generic methods |
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*/ |
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/* Allocated area consists on 3 parts: |
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struct video_buffer |
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struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) |
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struct videobuf_dma_sg_memory |
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*/ |
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static struct videobuf_buffer *__videobuf_alloc_vb(size_t size) |
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{ |
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struct videobuf_dma_sg_memory *mem; |
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struct videobuf_buffer *vb; |
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vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
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if (!vb) |
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return vb; |
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mem = vb->priv = ((char *)vb) + size; |
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mem->magic = MAGIC_SG_MEM; |
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videobuf_dma_init(&mem->dma); |
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dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
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__func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), |
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mem, (long)sizeof(*mem)); |
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return vb; |
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} |
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static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
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{ |
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struct videobuf_dma_sg_memory *mem = buf->priv; |
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BUG_ON(!mem); |
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MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
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return mem->dma.vaddr; |
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} |
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static int __videobuf_iolock(struct videobuf_queue *q, |
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struct videobuf_buffer *vb, |
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struct v4l2_framebuffer *fbuf) |
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{ |
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struct videobuf_dma_sg_memory *mem = vb->priv; |
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unsigned long pages; |
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dma_addr_t bus; |
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int err; |
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BUG_ON(!mem); |
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MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
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|
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if (!mem->dma.dev) |
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mem->dma.dev = q->dev; |
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else |
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WARN_ON(mem->dma.dev != q->dev); |
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|
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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(&mem->dma, |
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DMA_FROM_DEVICE, |
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pages); |
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if (0 != err) |
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return err; |
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} else if (vb->memory == V4L2_MEMORY_USERPTR) { |
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/* dma directly to userspace */ |
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err = videobuf_dma_init_user(&mem->dma, |
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DMA_FROM_DEVICE, |
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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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} else { |
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/* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP |
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buffers can only be called from videobuf_qbuf |
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we take current->mm->mmap_lock there, to prevent |
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locking inversion, so don't take it here */ |
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|
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err = videobuf_dma_init_user_locked(&mem->dma, |
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DMA_FROM_DEVICE, |
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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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/* |
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* Using a double cast to avoid compiler warnings when |
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* building for PAE. Compiler doesn't like direct casting |
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* of a 32 bit ptr to 64 bit integer. |
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*/ |
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bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; |
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pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; |
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err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
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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_map(q->dev, &mem->dma); |
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if (0 != err) |
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return err; |
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|
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return 0; |
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} |
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|
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static int __videobuf_sync(struct videobuf_queue *q, |
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struct videobuf_buffer *buf) |
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{ |
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struct videobuf_dma_sg_memory *mem = buf->priv; |
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BUG_ON(!mem || !mem->dma.sglen); |
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|
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MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
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MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF); |
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|
|
dma_sync_sg_for_cpu(q->dev, mem->dma.sglist, |
|
mem->dma.nr_pages, mem->dma.direction); |
|
|
|
return 0; |
|
} |
|
|
|
static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
|
struct videobuf_buffer *buf, |
|
struct vm_area_struct *vma) |
|
{ |
|
struct videobuf_dma_sg_memory *mem = buf->priv; |
|
struct videobuf_mapping *map; |
|
unsigned int first, last, size = 0, i; |
|
int retval; |
|
|
|
retval = -EINVAL; |
|
|
|
BUG_ON(!mem); |
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
|
|
|
/* look for first buffer to map */ |
|
for (first = 0; first < VIDEO_MAX_FRAME; first++) { |
|
if (buf == q->bufs[first]) { |
|
size = PAGE_ALIGN(q->bufs[first]->bsize); |
|
break; |
|
} |
|
} |
|
|
|
/* paranoia, should never happen since buf is always valid. */ |
|
if (!size) { |
|
dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
|
(vma->vm_pgoff << PAGE_SHIFT)); |
|
goto done; |
|
} |
|
|
|
last = first; |
|
|
|
/* create mapping + update buffer list */ |
|
retval = -ENOMEM; |
|
map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
|
if (NULL == map) |
|
goto done; |
|
|
|
size = 0; |
|
for (i = first; i <= last; i++) { |
|
if (NULL == q->bufs[i]) |
|
continue; |
|
q->bufs[i]->map = map; |
|
q->bufs[i]->baddr = vma->vm_start + size; |
|
size += PAGE_ALIGN(q->bufs[i]->bsize); |
|
} |
|
|
|
map->count = 1; |
|
map->q = q; |
|
vma->vm_ops = &videobuf_vm_ops; |
|
vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
|
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: |
|
return retval; |
|
} |
|
|
|
static struct videobuf_qtype_ops sg_ops = { |
|
.magic = MAGIC_QTYPE_OPS, |
|
|
|
.alloc_vb = __videobuf_alloc_vb, |
|
.iolock = __videobuf_iolock, |
|
.sync = __videobuf_sync, |
|
.mmap_mapper = __videobuf_mmap_mapper, |
|
.vaddr = __videobuf_to_vaddr, |
|
}; |
|
|
|
void *videobuf_sg_alloc(size_t size) |
|
{ |
|
struct videobuf_queue q; |
|
|
|
/* Required to make generic handler to call __videobuf_alloc */ |
|
q.int_ops = &sg_ops; |
|
|
|
q.msize = size; |
|
|
|
return videobuf_alloc_vb(&q); |
|
} |
|
EXPORT_SYMBOL_GPL(videobuf_sg_alloc); |
|
|
|
void videobuf_queue_sg_init(struct videobuf_queue *q, |
|
const struct videobuf_queue_ops *ops, |
|
struct device *dev, |
|
spinlock_t *irqlock, |
|
enum v4l2_buf_type type, |
|
enum v4l2_field field, |
|
unsigned int msize, |
|
void *priv, |
|
struct mutex *ext_lock) |
|
{ |
|
videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
|
priv, &sg_ops, ext_lock); |
|
} |
|
EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
|
|
|
|