Re: [Xen-devel] [PATCH 1/1] cameraif: add ABI for para-virtual camera

[Juergen Gross <jgross@xxxxxxxx>]

On 31/07/18 11:31, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> 
> This is the ABI for the two halves of a para-virtualized
> camera driver which extends Xen's reach multimedia capabilities even
> farther enabling it for video conferencing, In-Vehicle Infotainment,
> high definition maps etc.
> 
> The initial goal is to support most needed functionality with the
> final idea to make it possible to extend the protocol if need be:
> 
> 1. Provide means for base virtual device configuration:
>  - pixel formats
>  - resolutions
>  - frame rates
> 2. Support basic camera controls:
>  - contrast
>  - brightness
>  - hue
>  - saturation
> 3. Support streaming control
> 4. Support zero-copying use-cases
> 
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

Some style issues below...

> ---
>  xen/include/public/io/cameraif.h | 981 +++++++++++++++++++++++++++++++
>  1 file changed, 981 insertions(+)
>  create mode 100644 xen/include/public/io/cameraif.h
> 
> diff --git a/xen/include/public/io/cameraif.h 
> b/xen/include/public/io/cameraif.h
> new file mode 100644
> index 000000000000..bdc6a1262fcf
> --- /dev/null
> +++ b/xen/include/public/io/cameraif.h

> +struct xencamera_config {
> +    uint32_t pixel_format;
> +    uint32_t width;
> +    uint32_t height;
> +    uint32_t frame_rate_nom;
> +    uint32_t frame_rate_denom;
> +    uint8_t num_bufs;

Add explicit padding?

> +};

> +struct xencamera_req {
> +    uint16_t id;
> +    uint8_t operation;
> +    uint8_t reserved[5];
> +    union {
> +        struct xencamera_config config;
> +        struct xencamera_buf_create_req buf_create;
> +     struct xencamera_buf_destroy_req buf_destroy;
> +     struct xencamera_set_ctrl_req set_ctrl;

No tabs, please.

> +        uint8_t reserved[56];
> +    } req;
> +};
> +
> +struct xencamera_resp {
> +    uint16_t id;
> +    uint8_t operation;
> +    uint8_t reserved;
> +    int32_t status;
> +    union {
> +        struct xencamera_config config;
> +        struct xencamera_buf_details_resp buf_details;
> +     struct xencamera_get_ctrl_details_resp ctrl_details;

Tab again.

> +        uint8_t reserved1[56];
> +    } resp;
> +};


Juergen

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