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media: v4l2: Add REMOVE_BUFS ioctl

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VIDIOC_REMOVE_BUFS ioctl allows to remove buffers from a queue.
The number of buffers to remove in given by count field of
struct v4l2_remove_buffers and the range start at the index
specified in the same structure.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil: vidioc-remove-bufs.rst: mention no bufs are freed on error]
This commit is contained in:
Benjamin Gaignard
2024-03-14 16:32:24 +01:00
committed by Hans Verkuil
parent 5fb19f2092
commit a3293a8538
11 changed files with 211 additions and 1 deletions
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17
include/uapi/linux/videodev2.h
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@@ -1036,6 +1036,7 @@ struct v4l2_requestbuffers {
#define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF (1 << 5)
#define V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS (1 << 6)
#define V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS (1 << 7)
#define V4L2_BUF_CAP_SUPPORTS_REMOVE_BUFS (1 << 8)
/**
* struct v4l2_plane - plane info for multi-planar buffers
@@ -2624,6 +2625,20 @@ struct v4l2_create_buffers {
__u32 reserved[5];
};
/**
* struct v4l2_remove_buffers - VIDIOC_REMOVE_BUFS argument
* @index: the first buffer to be removed
* @count: number of buffers to removed
* @type: enum v4l2_buf_type
* @reserved: future extensions
*/
struct v4l2_remove_buffers {
__u32 index;
__u32 count;
__u32 type;
__u32 reserved[13];
};
/*
* I O C T L C O D E S F O R V I D E O D E V I C E S
*
@@ -2723,6 +2738,8 @@ struct v4l2_create_buffers {
#define VIDIOC_DBG_G_CHIP_INFO _IOWR('V', 102, struct v4l2_dbg_chip_info)
#define VIDIOC_QUERY_EXT_CTRL _IOWR('V', 103, struct v4l2_query_ext_ctrl)
#define VIDIOC_REMOVE_BUFS _IOWR('V', 104, struct v4l2_remove_buffers)
/* Reminder: when adding new ioctls please add support for them to
drivers/media/v4l2-core/v4l2-compat-ioctl32.c as well! */