From 6bbd4fec0cd93823fe651fa3907bee2bc6c814f6 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Mon, 26 May 2014 11:17:32 -0300 Subject: [PATCH] [media] videobuf2-dma-contig: allow to vmap contiguous dma buffers This allows drivers to vmap contiguous dma buffers so they can inspect the buffer contents with the CPU. This will be needed for the CODA driver's JPEG handling. On CODA960, the header parsing has to be done on the CPU. The hardware modules can only process the entropy coded segment after all registers and tables are set up. Signed-off-by: Philipp Zabel Acked-by: Marek Szyprowski Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/videobuf2-dma-contig.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c index 880be0782dd9..6b254b8e47c4 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c @@ -98,6 +98,9 @@ static void *vb2_dc_vaddr(void *buf_priv) { struct vb2_dc_buf *buf = buf_priv; + if (!buf->vaddr && buf->db_attach) + buf->vaddr = dma_buf_vmap(buf->db_attach->dmabuf); + return buf->vaddr; } @@ -735,6 +738,7 @@ static int vb2_dc_map_dmabuf(void *mem_priv) buf->dma_addr = sg_dma_address(sgt->sgl); buf->dma_sgt = sgt; + buf->vaddr = NULL; return 0; } @@ -754,6 +758,10 @@ static void vb2_dc_unmap_dmabuf(void *mem_priv) return; } + if (buf->vaddr) { + dma_buf_vunmap(buf->db_attach->dmabuf, buf->vaddr); + buf->vaddr = NULL; + } dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir); buf->dma_addr = 0;