From 3b299d9abf159c5e40864f8ece97d914b6a9f4b1 Mon Sep 17 00:00:00 2001 From: Lucas Stach Date: Thu, 24 Oct 2019 07:32:49 -0300 Subject: [PATCH] media: coda: request to skip kernel mapping for decoded buffers The kernel driver never touches the decoded buffers with the CPU. All accesses are either done by hardware DMA masters or userspace mapping the buffers. This means we don't need a kernel virtual address mapping for those buffers at all. As those buffers are usually quite large, we can save a good deal of kernel vmalloc space by requesting to not have a kernel mapping set up for them. Signed-off-by: Lucas Stach Signed-off-by: Philipp Zabel Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/coda/coda-common.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c index 834f11fe9dc2..287dc1692286 100644 --- a/drivers/media/platform/coda/coda-common.c +++ b/drivers/media/platform/coda/coda-common.c @@ -2387,6 +2387,7 @@ int coda_decoder_queue_init(void *priv, struct vb2_queue *src_vq, dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; dst_vq->io_modes = VB2_DMABUF | VB2_MMAP; + dst_vq->dma_attrs = DMA_ATTR_NO_KERNEL_MAPPING; dst_vq->mem_ops = &vb2_dma_contig_memops; return coda_queue_init(priv, dst_vq); -- 2.30.2