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media: videodev2.h: Add request_fd field to v4l2_buffer

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When queuing buffers allow for passing the request that should
be associated with this buffer.

If V4L2_BUF_FLAG_REQUEST_FD is set, then request_fd is used as
the file descriptor.

If a buffer is stored in a request, but not yet queued to the
driver, then V4L2_BUF_FLAG_IN_REQUEST is set.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-05-21 04:54:44 -04:00 committed by Mauro Carvalho Chehab
parent 55028695c3
commit 62fed26ff4
5 changed files with 19 additions and 8 deletions
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2
drivers/media/common/videobuf2/videobuf2-v4l2.c
View File

@ -384,7 +384,7 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
b->timecode = vbuf->timecode;
b->sequence = vbuf->sequence;
b->reserved2 = 0;
b->reserved = 0;
b->request_fd = 0;
if (q->is_multiplanar) {
/*

2
drivers/media/usb/cpia2/cpia2_v4l.c
View File

@ -949,7 +949,7 @@ static int cpia2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
buf->length = cam->frame_size;
buf->reserved2 = 0;
buf->reserved = 0;
buf->request_fd = 0;
memset(&buf->timecode, 0, sizeof(buf->timecode));
DBG("DQBUF #%d status:%d seq:%d length:%d\n", buf->index,

9
drivers/media/v4l2-core/v4l2-compat-ioctl32.c
View File

@ -482,7 +482,7 @@ struct v4l2_buffer32 {
} m;
__u32 length;
__u32 reserved2;
__u32 reserved;
__s32 request_fd;
};
static int get_v4l2_plane32(struct v4l2_plane __user *p64,
@ -581,6 +581,7 @@ static int get_v4l2_buffer32(struct v4l2_buffer __user *p64,
{
u32 type;
u32 length;
s32 request_fd;
enum v4l2_memory memory;
struct v4l2_plane32 __user *uplane32;
struct v4l2_plane __user *uplane;
@ -595,7 +596,9 @@ static int get_v4l2_buffer32(struct v4l2_buffer __user *p64,
get_user(memory, &p32->memory) ||
put_user(memory, &p64->memory) ||
get_user(length, &p32->length) ||
put_user(length, &p64->length))
put_user(length, &p64->length) ||
get_user(request_fd, &p32->request_fd) ||
put_user(request_fd, &p64->request_fd))
return -EFAULT;
if (V4L2_TYPE_IS_OUTPUT(type))
@ -699,7 +702,7 @@ static int put_v4l2_buffer32(struct v4l2_buffer __user *p64,
copy_in_user(&p32->timecode, &p64->timecode, sizeof(p64->timecode)) ||
assign_in_user(&p32->sequence, &p64->sequence) ||
assign_in_user(&p32->reserved2, &p64->reserved2) ||
assign_in_user(&p32->reserved, &p64->reserved) ||
assign_in_user(&p32->request_fd, &p64->request_fd) ||
get_user(length, &p64->length) ||
put_user(length, &p32->length))
return -EFAULT;

4
drivers/media/v4l2-core/v4l2-ioctl.c
View File

@ -474,13 +474,13 @@ static void v4l_print_buffer(const void *arg, bool write_only)
const struct v4l2_plane *plane;
int i;
pr_cont("%02ld:%02d:%02d.%08ld index=%d, type=%s, flags=0x%08x, field=%s, sequence=%d, memory=%s",
pr_cont("%02ld:%02d:%02d.%08ld index=%d, type=%s, request_fd=%d, flags=0x%08x, field=%s, sequence=%d, memory=%s",
p->timestamp.tv_sec / 3600,
(int)(p->timestamp.tv_sec / 60) % 60,
(int)(p->timestamp.tv_sec % 60),
(long)p->timestamp.tv_usec,
p->index,
prt_names(p->type, v4l2_type_names),
prt_names(p->type, v4l2_type_names), p->request_fd,
p->flags, prt_names(p->field, v4l2_field_names),
p->sequence, prt_names(p->memory, v4l2_memory_names));

10
include/uapi/linux/videodev2.h
View File

@ -917,6 +917,7 @@ struct v4l2_plane {
* @length: size in bytes of the buffer (NOT its payload) for single-plane
* buffers (when type != *_MPLANE); number of elements in the
* planes array for multi-plane buffers
* @request_fd: fd of the request that this buffer should use
*
* Contains data exchanged by application and driver using one of the Streaming
* I/O methods.
@ -941,7 +942,10 @@ struct v4l2_buffer {
} m;
__u32 length;
__u32 reserved2;
__u32 reserved;
union {
__s32 request_fd;
__u32 reserved;
};
};
/* Flags for 'flags' field */
@ -959,6 +963,8 @@ struct v4l2_buffer {
#define V4L2_BUF_FLAG_BFRAME 0x00000020
/* Buffer is ready, but the data contained within is corrupted. */
#define V4L2_BUF_FLAG_ERROR 0x00000040
/* Buffer is added to an unqueued request */
#define V4L2_BUF_FLAG_IN_REQUEST 0x00000080
/* timecode field is valid */
#define V4L2_BUF_FLAG_TIMECODE 0x00000100
/* Buffer is prepared for queuing */
@ -977,6 +983,8 @@ struct v4l2_buffer {
#define V4L2_BUF_FLAG_TSTAMP_SRC_SOE 0x00010000
/* mem2mem encoder/decoder */
#define V4L2_BUF_FLAG_LAST 0x00100000
/* request_fd is valid */
#define V4L2_BUF_FLAG_REQUEST_FD 0x00800000
/**
* struct v4l2_exportbuffer - export of video buffer as DMABUF file descriptor