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Date: Tue, 4 Aug 2020 16:34:10 -0300
From: Helen Koike <helen.koike@...labora.com>
To: mchehab@...nel.org, hans.verkuil@...co.com,
laurent.pinchart@...asonboard.com, sakari.ailus@....fi,
linux-media@...r.kernel.org
Cc: tfiga@...omium.org, hiroh@...omium.org, nicolas@...fresne.ca,
Brian.Starkey@....com, kernel@...labora.com,
boris.brezillon@...labora.com, narmstrong@...libre.com,
linux-kernel@...r.kernel.org, frkoenig@...omium.org,
mjourdan@...libre.com, stanimir.varbanov@...aro.org
Subject: Re: [PATCH v5 0/7] media: v4l2: Add extended fmt and buffer ioctls
On 8/4/20 4:29 PM, Helen Koike wrote:
> Hello,
>
> This is v5 of the Extended API for formats and buffers, which introduces
> the following new ioctls:
>
> int ioctl(int fd, VIDIOC_G_EXT_PIX_FMT, struct v4l2_ext_pix_format *argp)
> int ioctl(int fd, VIDIOC_S_EXT_PIX_FMT, struct v4l2_ext_pix_format *argp)
> int ioctl(int fd, VIDIOC_TRY_EXT_PIX_FMT, struct v4l2_ext_pix_format *argp)
>
> int ioctl(int fd, VIDIOC_EXT_CREATE_BUFS, struct v4l2_ext_create_buffers *argp)
> int ioctl(int fd, VIDIOC_EXT_QUERYBUF, struct v4l2_ext_buffer *argp)
> int ioctl(int fd, VIDIOC_EXT_QBUF, struct v4l2_ext_buffer *argp)
> int ioctl(int fd, VIDIOC_EXT_DQBUF, struct v4l2_ext_buffer *argp)
> int ioctl(int fd, VIDIOC_EXT_PREPARE_BUF, struct v4l2_ext_buffer *argp)
>
> Please check v4 cover letter specific topic past discussions
> https://patchwork.linuxtv.org/project/linux-media/cover/20200717115435.2632623-1-helen.koike@collabora.com/
>
> Documentation
> =============
> I added a first version of the documentation.
> I would appreciate some tips in how to organize this better, since there are
> several parts of the docs which reference the "old" API, and for now
> I just added a note pointing to the Extended API.
>
> Instead of duplicating documentation from the code to the Docs (as used by
> most part of v4l2 documentation), I just added a reference to let Sphinx get
> the structs documentation from the code, so we can avoid duplicating.
>
> For reviewing convenience, I uploaded the generated html docs at
> https://people.collabora.com/~koike/ext-doc-v5/userspace-api/media/v4l/ext-api.html
>
> There is room for improvements, it would be great to get your suggestions.
>
> uAPI
> ====
> This version have some minor changes in the uAPI structs, highlight to the
> mem_offset that was returned to struct v4l2_ext_plane, memory field that now
> is per plane, and some adjustments in field sizes and re-ordering to make
> structs the same for 32 and 64 bits (which I verified with pahole tool).
>
> I also updated v4l2-compliance:
> https://gitlab.collabora.com/koike/v4l-utils/-/tree/ext-api/wip
>
> We need to decide the size of the reserved fields left, how much reserved
> fields do you think we should leave for each struct?
>
> What is next
> ============
> I would like to improve implementation (for the kernel and v4l2-compliane) and
> drop the RFC tag for next version, so please review the uAPI.
Ops, sorry, I forgot to add RFC tag when submitting. Please consider RFC for this one.
Regards,
Helen
>
>
> List of changes in v5:
> ======================
> * first version of Documentation
> * migrate memory from v4l2_ext_buffer to v4l2_ext_plane
> * return mem_offset to struct v4l2_ext_plane
> * change sizes and reorder fields to avoid holes in the struct and make it
> the same for 32 and 64 bits
> * removed __attribute__ ((packed)) from uapi structs
> * set request_fd to signed
> * add documentation
> * updated some commit messages
>
> Hans Verkuil (1):
> media: v4l2: Add extended buffer operations
>
> Helen Koike (6):
> media: v4l2: Extend pixel formats to unify single/multi-planar
> handling (and more)
> media: videobuf2: Expose helpers to implement the _ext_fmt and
> _ext_buf hooks
> media: mediabus: Add helpers to convert a ext_pix format to/from a
> mbus_fmt
> media: vivid: Convert the capture and output drivers to
> EXT_FMT/EXT_BUF
> media: vimc: Implement the ext_fmt and ext_buf hooks
> media: docs: add documentation for the Extended API
>
> .../userspace-api/media/v4l/buffer.rst | 5 +
> .../userspace-api/media/v4l/common.rst | 1 +
> .../userspace-api/media/v4l/dev-capture.rst | 5 +
> .../userspace-api/media/v4l/dev-output.rst | 5 +
> .../userspace-api/media/v4l/ext-api.rst | 107 ++
> .../userspace-api/media/v4l/format.rst | 16 +-
> .../userspace-api/media/v4l/user-func.rst | 5 +
> .../media/v4l/vidioc-ext-create-bufs.rst | 95 ++
> .../media/v4l/vidioc-ext-prepare-buf.rst | 62 ++
> .../media/v4l/vidioc-ext-qbuf.rst | 204 ++++
> .../media/v4l/vidioc-ext-querybuf.rst | 79 ++
> .../media/v4l/vidioc-g-ext-pix-fmt.rst | 117 +++
> .../media/common/videobuf2/videobuf2-core.c | 2 +
> .../media/common/videobuf2/videobuf2-v4l2.c | 560 ++++++-----
> .../media/test-drivers/vimc/vimc-capture.c | 61 +-
> drivers/media/test-drivers/vimc/vimc-common.c | 6 +-
> drivers/media/test-drivers/vimc/vimc-common.h | 2 +-
> drivers/media/test-drivers/vivid/vivid-core.c | 70 +-
> .../test-drivers/vivid/vivid-touch-cap.c | 26 +-
> .../test-drivers/vivid/vivid-touch-cap.h | 3 +-
> .../media/test-drivers/vivid/vivid-vid-cap.c | 169 +---
> .../media/test-drivers/vivid/vivid-vid-cap.h | 15 +-
> .../media/test-drivers/vivid/vivid-vid-out.c | 193 ++--
> .../media/test-drivers/vivid/vivid-vid-out.h | 15 +-
> drivers/media/v4l2-core/v4l2-dev.c | 50 +-
> drivers/media/v4l2-core/v4l2-ioctl.c | 938 ++++++++++++++++--
> include/media/v4l2-ioctl.h | 60 ++
> include/media/v4l2-mediabus.h | 42 +
> include/media/videobuf2-core.h | 6 +-
> include/media/videobuf2-v4l2.h | 21 +-
> include/uapi/linux/videodev2.h | 146 +++
> 31 files changed, 2363 insertions(+), 723 deletions(-)
> create mode 100644 Documentation/userspace-api/media/v4l/ext-api.rst
> create mode 100644 Documentation/userspace-api/media/v4l/vidioc-ext-create-bufs.rst
> create mode 100644 Documentation/userspace-api/media/v4l/vidioc-ext-prepare-buf.rst
> create mode 100644 Documentation/userspace-api/media/v4l/vidioc-ext-qbuf.rst
> create mode 100644 Documentation/userspace-api/media/v4l/vidioc-ext-querybuf.rst
> create mode 100644 Documentation/userspace-api/media/v4l/vidioc-g-ext-pix-fmt.rst
>
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