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authorSergey Senozhatsky <senozhatsky@chromium.org>2020-05-14 18:01:43 +0200
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-06-23 13:28:17 +0200
commitac53503ee38a1ffbc47c7cca6cbfc48ba9c65c5e (patch)
treeb7ecc13ff0ade9fd511d5f7a788237cb0f126a00 /drivers/media/common
parentf5f5fa73fbfb9f346f1b5f37ebf343bae6ef6361 (diff)
downloadlinux-ac53503ee38a1ffbc47c7cca6cbfc48ba9c65c5e.tar.bz2
media: videobuf2: add V4L2_FLAG_MEMORY_NON_CONSISTENT flag
By setting or clearing V4L2_FLAG_MEMORY_NON_CONSISTENT flag user-space should be able to set or clear queue's NON_CONSISTENT ->dma_attrs. Queue's ->dma_attrs are passed to the underlying allocator in __vb2_buf_mem_alloc(), so thus user-space is able to request vb2 buffer's memory to be either consistent (coherent) or non-consistent. The patch set also adds a corresponding capability flag: fill_buf_caps() reports V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS when queue supports user-space cache management hints. Note, however, that MMAP_CACHE_HINTS capability only valid when the queue is used for memory MMAP-ed streaming I/O. Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/common')
-rw-r--r--drivers/media/common/videobuf2/videobuf2-v4l2.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index f13851212cc8..e4b4354b42b8 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -710,6 +710,8 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
*caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF;
if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF)
*caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF;
+ if (q->allow_cache_hints && q->io_modes & VB2_MMAP)
+ *caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS;
#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
if (q->supports_requests)
*caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;