On 2017.11.15 11:48:42 -0700, Alex Williamson wrote:
> On Wed, 15 Nov 2017 17:11:54 +0800
> Tina Zhang <tina.zh...@intel.com> wrote:
>
> > Add VFIO_DEVICE_QUERY_GFX_PLANE ioctl command to let user query and get
> > a plane and its information. So far, two types of buffers are supported:
> > buffers based on dma-buf and buffers based on region.
> >
> > This ioctl can be invoked with:
> > 1) Either DMABUF or REGION flag. Vendor driver returns a plane_info
> > successfully only when the specific kind of buffer is supported.
> > 2) Flag PROBE. And at the same time either DMABUF or REGION must be set,
> > so that vendor driver returns success only when the specific kind of
> > buffer is supported.
> >
> > Add VFIO_DEVICE_GET_GFX_DMABUF ioctl command to let user get a specific
> > dma-buf fd of an exposed MDEV buffer provided by dmabuf_id which was
> > returned in VFIO_DEVICE_QUERY_GFX_PLANE ioctl command.
> >
> > The life cycle of an exposed MDEV buffer is handled by userspace and
> > tracked by kernel space. The returned dmabuf_id in struct vfio_device_
> > query_gfx_plane can be a new id of a new exposed buffer or an old id of
> > a re-exported buffer. Host user can check the value of dmabuf_id to see
> > if it needs to create new resources according to the new exposed buffer
> > or just re-use the existing resource related to the old buffer.
> >
> > v18:
> > - update comments for VFIO_DEVICE_GET_GFX_DMABUF. (Alex)
> >
> > v17:
> > - modify VFIO_DEVICE_GET_GFX_DMABUF interface. (Alex)
> >
> > v16:
> > - add x_hot and y_hot fields. (Gerd)
> > - add comments for VFIO_DEVICE_GET_GFX_DMABUF. (Alex)
> > - rebase to 4.14.0-rc6.
> >
> > v15:
> > - add a ioctl to get a dmabuf for a given dmabuf id. (Gerd)
> >
> > v14:
> > - add PROBE, DMABUF and REGION flags. (Alex)
> >
> > v12:
> > - add drm_format_mod back. (Gerd and Zhenyu)
> > - add region_index. (Gerd)
> >
> > v11:
> > - rename plane_type to drm_plane_type. (Gerd)
> > - move fields of vfio_device_query_gfx_plane to vfio_device_gfx_plane_info.
> > (Gerd)
> > - remove drm_format_mod, start fields. (Daniel)
> > - remove plane_id.
> >
> > v10:
> > - refine the ABI API VFIO_DEVICE_QUERY_GFX_PLANE. (Alex) (Gerd)
> >
> > v3:
> > - add a field gvt_plane_info in the drm_i915_gem_obj structure to save
> > the decoded plane information to avoid look up while need the plane
> > info. (Gerd)
> >
> > Signed-off-by: Tina Zhang <tina.zh...@intel.com>
> > Cc: Gerd Hoffmann <kra...@redhat.com>
> > Cc: Alex Williamson <alex.william...@redhat.com>
> > Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
> > ---
> > include/uapi/linux/vfio.h | 62
> > +++++++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 62 insertions(+)
> >
> > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> > index ae46105..5c1cca2 100644
> > --- a/include/uapi/linux/vfio.h
> > +++ b/include/uapi/linux/vfio.h
> > @@ -502,6 +502,68 @@ 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 flags, then retrieve the gfx plane info.
> > + *
> > + * flags supported:
> > + * - VFIO_GFX_PLANE_TYPE_PROBE and VFIO_GFX_PLANE_TYPE_DMABUF are set
> > + * to ask if the mdev supports dma-buf. 0 on support, -EINVAL on no
> > + * support for dma-buf.
> > + * - VFIO_GFX_PLANE_TYPE_PROBE and VFIO_GFX_PLANE_TYPE_REGION are set
> > + * to ask if the mdev supports region. 0 on support, -EINVAL on no
> > + * support for region.
> > + * - VFIO_GFX_PLANE_TYPE_DMABUF or VFIO_GFX_PLANE_TYPE_REGION is set
> > + * with each call to query the plane info.
> > + * - Others are invalid and return -EINVAL.
> > + *
> > + * Note:
> > + * 1. Plane could be disabled by guest. In that case, success will be
> > + * returned with zero-initialized drm_format, size, width and height
> > + * fields.
> > + * 2. x_hot/y_hot is set to 0xFFFFFFFF if no hotspot information available
> > + *
> > + * Return: 0 on success, -errno on other failure.
> > + */
> > +struct vfio_device_gfx_plane_info {
> > + __u32 argsz;
> > + __u32 flags;
> > +#define VFIO_GFX_PLANE_TYPE_PROBE (1 << 0)
> > +#define VFIO_GFX_PLANE_TYPE_DMABUF (1 << 1)
> > +#define VFIO_GFX_PLANE_TYPE_REGION (1 << 2)
> > + /* in */
> > + __u32 drm_plane_type; /* type of plane: DRM_PLANE_TYPE_* */
> > + /* out */
> > + __u32 drm_format; /* drm format of plane */
> > + __u64 drm_format_mod; /* tiled mode */
> > + __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 */
> > + __u32 y_pos; /* vertical position of cursor plane*/
> > + __u32 x_hot; /* horizontal position of cursor hotspot */
> > + __u32 y_hot; /* vertical position of cursor hotspot */
> > + union {
> > + __u32 region_index; /* region index */
> > + __u32 dmabuf_id; /* dma-buf id */
> > + };
> > +};
> > +
> > +#define VFIO_DEVICE_QUERY_GFX_PLANE _IO(VFIO_TYPE, VFIO_BASE + 14)
> > +
> > +/**
> > + * VFIO_DEVICE_GET_GFX_DMABUF - _IOW(VFIO_TYPE, VFIO_BASE + 15, __u32)
> > + *
> > + * Return a new dma-buf file descriptor for an exposed guest framebuffer
> > + * described by the provided dmabuf_id. The dmabuf_id is returned from
> > VFIO_
> > + * DEVICE_QUERY_GFX_PLANE as a token of the exposed guest framebuffer.
> > + */
> > +
> > +#define VFIO_DEVICE_GET_GFX_DMABUF _IO(VFIO_TYPE, VFIO_BASE + 15)
> > +
> > /* -------- API for Type1 VFIO IOMMU -------- */
> >
> > /**
>
> Looks good to me. Kirti, have you had a chance yet to verify this is
> sufficient for your region-based approach? It would be great to get
> confirmation of that ASAP so we can get this in. Thanks,
> Alex, do you mind by merging this just through gvt tree? Or you would like to merge this then send pull request for us then we can apply left? -- Open Source Technology Center, Intel ltd. $gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827
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