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videobuf2/videobuf2-dma-sg.c: convert to use vm_map_pages()
Convert to use vm_map_pages() to map range of kernel memory to user vma. vm_pgoff is treated in V4L2 API as a 'cookie' to select a buffer, not as a in-buffer offset by design and it always want to mmap a whole buffer from its beginning. Link: http://lkml.kernel.org/r/a953fe6b3056de1cc6eab654effdd4a22f125375.1552921225.git.jrdr.linux@gmail.com Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com> Suggested-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Airlie <airlied@linux.ie> Cc: Heiko Stuebner <heiko@sntech.de> Cc: Joerg Roedel <joro@8bytes.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Juergen Gross <jgross@suse.com> Cc: Kees Cook <keescook@chromium.org> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Cc: Pawel Osciak <pawel@osciak.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Sandy Huang <hjc@rock-chips.com> Cc: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Thierry Reding <treding@nvidia.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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parent
b0d0084fd9
commit
a17ae14766
3 changed files with 13 additions and 22 deletions
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@ -2201,6 +2201,13 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
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goto unlock;
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}
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/*
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* vm_pgoff is treated in V4L2 API as a 'cookie' to select a buffer,
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* not as a in-buffer offset. We always want to mmap a whole buffer
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* from its beginning.
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*/
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vma->vm_pgoff = 0;
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ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma);
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unlock:
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@ -186,12 +186,6 @@ static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma)
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return -EINVAL;
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}
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/*
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* dma_mmap_* uses vm_pgoff as in-buffer offset, but we want to
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* map whole buffer
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*/
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vma->vm_pgoff = 0;
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ret = dma_mmap_attrs(buf->dev, vma, buf->cookie,
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buf->dma_addr, buf->size, buf->attrs);
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@ -328,28 +328,18 @@ static unsigned int vb2_dma_sg_num_users(void *buf_priv)
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static int vb2_dma_sg_mmap(void *buf_priv, struct vm_area_struct *vma)
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{
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struct vb2_dma_sg_buf *buf = buf_priv;
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unsigned long uaddr = vma->vm_start;
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unsigned long usize = vma->vm_end - vma->vm_start;
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int i = 0;
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int err;
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if (!buf) {
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printk(KERN_ERR "No memory to map\n");
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return -EINVAL;
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}
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do {
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int ret;
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ret = vm_insert_page(vma, uaddr, buf->pages[i++]);
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if (ret) {
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printk(KERN_ERR "Remapping memory, error: %d\n", ret);
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return ret;
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}
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uaddr += PAGE_SIZE;
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usize -= PAGE_SIZE;
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} while (usize > 0);
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err = vm_map_pages(vma, buf->pages, buf->num_pages);
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if (err) {
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printk(KERN_ERR "Remapping memory, error: %d\n", err);
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return err;
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}
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/*
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* Use common vm_area operations to track buffer refcount.
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