On Wed, Jul 12, 2017 at 02:10:51PM +0800, Tina Zhang wrote:
> Add VFIO_DEVICE_QUERY_GFX_PLANE ioctl command to let user mode query and
> get the plan and its related information.
>
> The dma-buf's life cycle is handled by user mode and tracked by kernel.
> The returned fd in struct vfio_device_query_gfx_plane can be a new
> fd or an old fd of a re-exported dma-buf. Host User mode can check the
> value of fd and to see if it needs to create new resource according to
> the new fd or just use the existed resource related to the old fd.
>
> Signed-off-by: Tina Zhang <tina.zhang@xxxxxxxxx>
>
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index ae46105..c176cc8 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -502,6 +502,32 @@ struct vfio_pci_hot_reset {
>
> #define VFIO_DEVICE_PCI_HOT_RESET _IO(VFIO_TYPE, VFIO_BASE + 13)
>
> +/**
> + * VFIO_DEVICE_QUERY_GFX_PLANE - _IOW(VFIO_TYPE, VFIO_BASE + 14, struct vfio_device_query_gfx_plane)
> + *
> + * Set the drm_plane_type and retrieve information about the gfx plane.
> + *
> + * Return: 0 on success, -errno on failure.
> + */
> +struct vfio_device_gfx_plane_info {
> + __u32 argsz;
What's argsz for?
> + __u32 flags;
> + /* in */
> + __u32 drm_plane_type; /* type of plane: DRM_PLANE_TYPE_* */
Do we plan to support multiple outputs on a vfio? In that case just the
plane-type doesn't identify the right plane. Also, if you want to support
overlay planes, then usually hw has a lot of those.
-Daniel
> + /* out */
> + __u32 drm_format; /* drm format of plane */
> + __u32 width; /* width of plane */
> + __u32 height; /* height of plane */
> + __u32 stride; /* stride of plane */
> + __u32 size; /* size of plane in bytes, align on page*/
> + __u32 x_pos; /* horizontal position of cursor plane, upper left corner in pixels */
> + __u32 y_pos; /* vertical position of cursor plane, upper left corner in lines*/
Why is x/y pos only for cursors? I'm not clear at all what this would be
for ... Is this an offset within the plane where the cursor starts?
-Daniel
> + __s32 fd; /* dma-buf fd */
> +};
> +
> +#define VFIO_DEVICE_QUERY_GFX_PLANE _IO(VFIO_TYPE, VFIO_BASE + 14)
> +
> +
> /* -------- API for Type1 VFIO IOMMU -------- */
>
> /**
> --
> 2.7.4
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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