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[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 <m.szyprowski@samsung.com>
Signed-off-by: Tomasz Stanislawski <t.stanislaws@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Marek Szyprowski 2012-06-14 11:32:21 -03:00 committed by Mauro Carvalho Chehab
parent 9bd09fd738
commit c60520fa50
3 changed files with 26 additions and 47 deletions
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28
drivers/media/v4l2-core/videobuf2-dma-contig.c
View File

@ -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;
}
/*********************************************/

40
drivers/media/v4l2-core/videobuf2-memops.c
View File

@ -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

5
include/media/videobuf2-memops.h
View File

@ -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);