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Message-ID: <eac9e222-b605-77b6-4428-66e20f3d1269@xs4all.nl>
Date: Tue, 20 Feb 2018 16:20:53 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Alexandre Courbot <acourbot@...omium.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Pawel Osciak <posciak@...omium.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Tomasz Figa <tfiga@...omium.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Gustavo Padovan <gustavo.padovan@...labora.com>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [RFCv4 10/21] videodev2.h: Add request_fd field to v4l2_buffer
On 02/20/18 05:44, Alexandre Courbot wrote:
> From: Hans Verkuil <hans.verkuil@...co.com>
>
> When queuing buffers allow for passing the request that should
> be associated with this buffer.
>
> Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
> [acourbot@...omium.org: make request ID 32-bit]
> Signed-off-by: Alexandre Courbot <acourbot@...omium.org>
> ---
> drivers/media/common/videobuf2/videobuf2-v4l2.c | 2 +-
> drivers/media/usb/cpia2/cpia2_v4l.c | 2 +-
> drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 9 ++++++---
> drivers/media/v4l2-core/v4l2-ioctl.c | 4 ++--
> include/uapi/linux/videodev2.h | 3 ++-
> 5 files changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> index 886a2d8d5c6c..6d4d184aa68e 100644
> --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
> +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> @@ -203,7 +203,7 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
> b->timestamp = ns_to_timeval(vb->timestamp);
> b->timecode = vbuf->timecode;
> b->sequence = vbuf->sequence;
> - b->reserved2 = 0;
> + b->request_fd = 0;
> b->reserved = 0;
>
> if (q->is_multiplanar) {
> diff --git a/drivers/media/usb/cpia2/cpia2_v4l.c b/drivers/media/usb/cpia2/cpia2_v4l.c
> index 99f106b13280..af42ce3ceb48 100644
> --- a/drivers/media/usb/cpia2/cpia2_v4l.c
> +++ b/drivers/media/usb/cpia2/cpia2_v4l.c
> @@ -948,7 +948,7 @@ static int cpia2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
> buf->sequence = cam->buffers[buf->index].seq;
> buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
> buf->length = cam->frame_size;
> - buf->reserved2 = 0;
> + buf->request_fd = 0;
> buf->reserved = 0;
> memset(&buf->timecode, 0, sizeof(buf->timecode));
>
> diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> index 5198c9eeb348..32bf47489a2e 100644
> --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> @@ -386,7 +386,7 @@ struct v4l2_buffer32 {
> __s32 fd;
> } m;
> __u32 length;
> - __u32 reserved2;
> + __s32 request_fd;
> __u32 reserved;
> };
>
> @@ -486,6 +486,7 @@ static int get_v4l2_buffer32(struct v4l2_buffer __user *kp,
> {
> u32 type;
> u32 length;
> + s32 request_fd;
> enum v4l2_memory memory;
> struct v4l2_plane32 __user *uplane32;
> struct v4l2_plane __user *uplane;
> @@ -500,7 +501,9 @@ static int get_v4l2_buffer32(struct v4l2_buffer __user *kp,
> get_user(memory, &up->memory) ||
> put_user(memory, &kp->memory) ||
> get_user(length, &up->length) ||
> - put_user(length, &kp->length))
> + put_user(length, &kp->length) ||
> + get_user(request_fd, &up->request_fd) ||
> + put_user(request_fd, &kp->request_fd))
> return -EFAULT;
>
> if (V4L2_TYPE_IS_OUTPUT(type))
> @@ -604,7 +607,7 @@ static int put_v4l2_buffer32(struct v4l2_buffer __user *kp,
> assign_in_user(&up->timestamp.tv_usec, &kp->timestamp.tv_usec) ||
> copy_in_user(&up->timecode, &kp->timecode, sizeof(kp->timecode)) ||
> assign_in_user(&up->sequence, &kp->sequence) ||
> - assign_in_user(&up->reserved2, &kp->reserved2) ||
> + assign_in_user(&up->request_fd, &kp->request_fd) ||
> assign_in_user(&up->reserved, &kp->reserved) ||
> get_user(length, &kp->length) ||
> put_user(length, &up->length))
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 260288ca4f55..7bfeaf233d5a 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -437,13 +437,13 @@ 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=%u, 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));
>
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 982718965180..4fd46ae8fad5 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -909,6 +909,7 @@ 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.
> @@ -932,7 +933,7 @@ struct v4l2_buffer {
> __s32 fd;
> } m;
> __u32 length;
> - __u32 reserved2;
> + __s32 request_fd;
This should be:
union {
__s32 request_fd;
__u32 reserved2;
};
Otherwise any existing application that sets 'reserved2 = 0;' would fail.
I encountered this issue when compiling v4l-utils.
Regards,
Hans
> __u32 reserved;
> };
>
>
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