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137 lines
5.0 KiB
Diff
137 lines
5.0 KiB
Diff
From ebd995296afa99a5c53f164e595f7a6d41d32a01 Mon Sep 17 00:00:00 2001
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From: Hans Verkuil <hansverk@cisco.com>
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Date: Thu, 23 Aug 2018 09:56:22 -0400
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Subject: [PATCH 690/806] media: videodev2.h: add new capabilities for buffer
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types
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Upstream commit f35f5d72e70e6b91389eb98fcabf43b79f40587f
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VIDIOC_REQBUFS and VIDIOC_CREATE_BUFFERS will return capabilities
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telling userspace what the given buffer type is capable of.
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Signed-off-by: Hans Verkuil <hansverk@cisco.com>
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Reviewed-by: Tomasz Figa <tfiga@chromium.org>
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Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
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Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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---
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.../media/uapi/v4l/vidioc-create-bufs.rst | 14 ++++++-
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.../media/uapi/v4l/vidioc-reqbufs.rst | 42 ++++++++++++++++++-
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include/uapi/linux/videodev2.h | 13 +++++-
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3 files changed, 65 insertions(+), 4 deletions(-)
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--- a/Documentation/media/uapi/v4l/vidioc-create-bufs.rst
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+++ b/Documentation/media/uapi/v4l/vidioc-create-bufs.rst
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@@ -102,7 +102,19 @@ than the number requested.
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- ``format``
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- Filled in by the application, preserved by the driver.
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* - __u32
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- - ``reserved``\ [8]
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+ - ``capabilities``
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+ - Set by the driver. If 0, then the driver doesn't support
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+ capabilities. In that case all you know is that the driver is
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+ guaranteed to support ``V4L2_MEMORY_MMAP`` and *might* support
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+ other :c:type:`v4l2_memory` types. It will not support any others
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+ capabilities. See :ref:`here <v4l2-buf-capabilities>` for a list of the
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+ capabilities.
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+
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+ If you want to just query the capabilities without making any
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+ other changes, then set ``count`` to 0, ``memory`` to
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+ ``V4L2_MEMORY_MMAP`` and ``format.type`` to the buffer type.
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+ * - __u32
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+ - ``reserved``\ [7]
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- A place holder for future extensions. Drivers and applications
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must set the array to zero.
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--- a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
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+++ b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
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@@ -88,10 +88,50 @@ any DMA in progress, an implicit
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``V4L2_MEMORY_DMABUF`` or ``V4L2_MEMORY_USERPTR``. See
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:c:type:`v4l2_memory`.
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* - __u32
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- - ``reserved``\ [2]
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+ - ``capabilities``
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+ - Set by the driver. If 0, then the driver doesn't support
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+ capabilities. In that case all you know is that the driver is
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+ guaranteed to support ``V4L2_MEMORY_MMAP`` and *might* support
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+ other :c:type:`v4l2_memory` types. It will not support any others
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+ capabilities.
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+
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+ If you want to query the capabilities with a minimum of side-effects,
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+ then this can be called with ``count`` set to 0, ``memory`` set to
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+ ``V4L2_MEMORY_MMAP`` and ``type`` set to the buffer type. This will
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+ free any previously allocated buffers, so this is typically something
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+ that will be done at the start of the application.
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+ * - __u32
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+ - ``reserved``\ [1]
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- A place holder for future extensions. Drivers and applications
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must set the array to zero.
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+.. tabularcolumns:: |p{6.1cm}|p{2.2cm}|p{8.7cm}|
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+
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+.. _v4l2-buf-capabilities:
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+.. _V4L2-BUF-CAP-SUPPORTS-MMAP:
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+.. _V4L2-BUF-CAP-SUPPORTS-USERPTR:
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+.. _V4L2-BUF-CAP-SUPPORTS-DMABUF:
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+.. _V4L2-BUF-CAP-SUPPORTS-REQUESTS:
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+
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+.. cssclass:: longtable
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+
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+.. flat-table:: V4L2 Buffer Capabilities Flags
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+ :header-rows: 0
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+ :stub-columns: 0
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+ :widths: 3 1 4
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+
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+ * - ``V4L2_BUF_CAP_SUPPORTS_MMAP``
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+ - 0x00000001
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+ - This buffer type supports the ``V4L2_MEMORY_MMAP`` streaming mode.
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+ * - ``V4L2_BUF_CAP_SUPPORTS_USERPTR``
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+ - 0x00000002
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+ - This buffer type supports the ``V4L2_MEMORY_USERPTR`` streaming mode.
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+ * - ``V4L2_BUF_CAP_SUPPORTS_DMABUF``
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+ - 0x00000004
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+ - This buffer type supports the ``V4L2_MEMORY_DMABUF`` streaming mode.
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+ * - ``V4L2_BUF_CAP_SUPPORTS_REQUESTS``
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+ - 0x00000008
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+ - This buffer type supports :ref:`requests <media-request-api>`.
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Return Value
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============
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--- a/include/uapi/linux/videodev2.h
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+++ b/include/uapi/linux/videodev2.h
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@@ -872,9 +872,16 @@ struct v4l2_requestbuffers {
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__u32 count;
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__u32 type; /* enum v4l2_buf_type */
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__u32 memory; /* enum v4l2_memory */
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- __u32 reserved[2];
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+ __u32 capabilities;
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+ __u32 reserved[1];
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};
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+/* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
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+#define V4L2_BUF_CAP_SUPPORTS_MMAP (1 << 0)
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+#define V4L2_BUF_CAP_SUPPORTS_USERPTR (1 << 1)
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+#define V4L2_BUF_CAP_SUPPORTS_DMABUF (1 << 2)
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+#define V4L2_BUF_CAP_SUPPORTS_REQUESTS (1 << 3)
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+
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/**
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* struct v4l2_plane - plane info for multi-planar buffers
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* @bytesused: number of bytes occupied by data in the plane (payload)
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@@ -2318,6 +2325,7 @@ struct v4l2_dbg_chip_info {
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* return: number of created buffers
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* @memory: enum v4l2_memory; buffer memory type
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* @format: frame format, for which buffers are requested
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+ * @capabilities: capabilities of this buffer type.
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* @reserved: future extensions
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*/
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struct v4l2_create_buffers {
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@@ -2325,7 +2333,8 @@ struct v4l2_create_buffers {
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__u32 count;
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__u32 memory;
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struct v4l2_format format;
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- __u32 reserved[8];
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+ __u32 capabilities;
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+ __u32 reserved[7];
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};
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/*
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