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Subject[RFC][PATCH 10/15] videobuf2: let user-space know when driver supports cache hints
Date
Add V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS to fill_buf_caps(), which
is set when queue supports user-space cache management hints.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
Documentation/media/uapi/v4l/vidioc-reqbufs.rst | 5 +++++
drivers/media/common/videobuf2/videobuf2-v4l2.c | 2 ++
include/uapi/linux/videodev2.h | 1 +
3 files changed, 8 insertions(+)

diff --git a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
index 9b69a61d9fd4..13eab807fdfb 100644
--- a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
+++ b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
@@ -166,6 +166,11 @@ aborting or finishing any DMA in progress, an implicit
- Only valid for stateless decoders. If set, then userspace can set the
``V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF`` flag to hold off on returning the
capture buffer until the OUTPUT timestamp changes.
+ * - ``V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS``
+ - 0x00000040
+ - This buffer supports :ref:`V4L2_BUF_FLAG_NO_CACHE_INVALIDATE` and
+ :ref:`V4L2_BUF_FLAG_NO_CACHE_CLEAN` user-space cache hints.
+

Return Value
============
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 48d123a1ac2a..1762849288ae 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -684,6 +684,8 @@ 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)
+ *caps |= V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS;
#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
if (q->supports_requests)
*caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 82e2ded5a136..b5d6b8d4ae93 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -932,6 +932,7 @@ struct v4l2_requestbuffers {
#define V4L2_BUF_CAP_SUPPORTS_REQUESTS (1 << 3)
#define V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS (1 << 4)
#define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF (1 << 5)
+#define V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS (1 << 6)

/**
* struct v4l2_plane - plane info for multi-planar buffers
--
2.24.1.735.g03f4e72817-goog
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