From c60520fa50cd86d64bc8ebb34300ddc4ca91393d Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Thu, 14 Jun 2012 11:32:21 -0300 Subject: [PATCH] [media] v4l: vb2-dma-contig: let mmap method to use dma_mmap_coherent call Let mmap method to use dma_mmap_coherent call. Moreover, this patch removes vb2_mmap_pfn_range from videobuf2 helpers as it was suggested by Laurent Pinchart. The function is no longer used in vb2 code. Signed-off-by: Marek Szyprowski Signed-off-by: Tomasz Stanislawski Acked-by: Laurent Pinchart Acked-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- .../media/v4l2-core/videobuf2-dma-contig.c | 28 ++++++++++++- drivers/media/v4l2-core/videobuf2-memops.c | 40 ------------------- include/media/videobuf2-memops.h | 5 --- 3 files changed, 26 insertions(+), 47 deletions(-) diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c index a5804cf12c7c..7fc71a0906db 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c @@ -178,14 +178,38 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size) static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma) { struct vb2_dc_buf *buf = buf_priv; + int ret; if (!buf) { printk(KERN_ERR "No buffer to map\n"); return -EINVAL; } - return vb2_mmap_pfn_range(vma, buf->dma_addr, buf->size, - &vb2_common_vm_ops, &buf->handler); + /* + * dma_mmap_* uses vm_pgoff as in-buffer offset, but we want to + * map whole buffer + */ + vma->vm_pgoff = 0; + + ret = dma_mmap_coherent(buf->dev, vma, buf->vaddr, + buf->dma_addr, buf->size); + + if (ret) { + pr_err("Remapping memory failed, error: %d\n", ret); + return ret; + } + + vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; + vma->vm_private_data = &buf->handler; + vma->vm_ops = &vb2_common_vm_ops; + + vma->vm_ops->open(vma); + + pr_debug("%s: mapped dma addr 0x%08lx at 0x%08lx, size %ld\n", + __func__, (unsigned long)buf->dma_addr, vma->vm_start, + buf->size); + + return 0; } /*********************************************/ diff --git a/drivers/media/v4l2-core/videobuf2-memops.c b/drivers/media/v4l2-core/videobuf2-memops.c index 051ea3571b20..81c1ad8b2cf1 100644 --- a/drivers/media/v4l2-core/videobuf2-memops.c +++ b/drivers/media/v4l2-core/videobuf2-memops.c @@ -136,46 +136,6 @@ int vb2_get_contig_userptr(unsigned long vaddr, unsigned long size, } EXPORT_SYMBOL_GPL(vb2_get_contig_userptr); -/** - * vb2_mmap_pfn_range() - map physical pages to userspace - * @vma: virtual memory region for the mapping - * @paddr: starting physical address of the memory to be mapped - * @size: size of the memory to be mapped - * @vm_ops: vm operations to be assigned to the created area - * @priv: private data to be associated with the area - * - * Returns 0 on success. - */ -int vb2_mmap_pfn_range(struct vm_area_struct *vma, unsigned long paddr, - unsigned long size, - const struct vm_operations_struct *vm_ops, - void *priv) -{ - int ret; - - size = min_t(unsigned long, vma->vm_end - vma->vm_start, size); - - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); - ret = remap_pfn_range(vma, vma->vm_start, paddr >> PAGE_SHIFT, - size, vma->vm_page_prot); - if (ret) { - printk(KERN_ERR "Remapping memory failed, error: %d\n", ret); - return ret; - } - - vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; - vma->vm_private_data = priv; - vma->vm_ops = vm_ops; - - vma->vm_ops->open(vma); - - pr_debug("%s: mapped paddr 0x%08lx at 0x%08lx, size %ld\n", - __func__, paddr, vma->vm_start, size); - - return 0; -} -EXPORT_SYMBOL_GPL(vb2_mmap_pfn_range); - /** * vb2_common_vm_open() - increase refcount of the vma * @vma: virtual memory region for the mapping diff --git a/include/media/videobuf2-memops.h b/include/media/videobuf2-memops.h index 84e1f6c031c5..f05444ca8c0c 100644 --- a/include/media/videobuf2-memops.h +++ b/include/media/videobuf2-memops.h @@ -33,11 +33,6 @@ extern const struct vm_operations_struct vb2_common_vm_ops; int vb2_get_contig_userptr(unsigned long vaddr, unsigned long size, struct vm_area_struct **res_vma, dma_addr_t *res_pa); -int vb2_mmap_pfn_range(struct vm_area_struct *vma, unsigned long paddr, - unsigned long size, - const struct vm_operations_struct *vm_ops, - void *priv); - struct vm_area_struct *vb2_get_vma(struct vm_area_struct *vma); void vb2_put_vma(struct vm_area_struct *vma);