On Wed, 28 Jan 2026 18:40:57 +0000 Caterina Shablia <[email protected]> wrote:
> This modifier is primarily intended to be used by panvk to implement > sparse partially-resident images with better map and unmap > performance, and no worse access performance, compared to > implementing them in terms of U-interleaved. > > With this modifier, the plane is divided into 64k byte 1:1 or 2:1 > -sided tiles. The 64k tiles are laid out linearly. Each 64k tile > is divided into blocks of 16x16 texel blocks each, which themselves > are laid out linearly within a 64k tile. Then within each such > 16x16 block, texel blocks are laid out according to U order, > similar to 16X16_BLOCK_U_INTERLEAVED. > > Unlike 16X16_BLOCK_U_INTERLEAVED, the layout does not depend on > whether a format is compressed or not. > > The hardware features corresponding to this modifier are available > starting with v10 (second gen Valhall.) > > The corresponding panvk MR can be found at: > https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38986 > > Previous version: > https://lists.freedesktop.org/archives/dri-devel/2026-January/547072.html > > No changes since v2 > > Changes since v1: > > * Rewrite the description of the modifier to be hopefully unambiguous. > > Signed-off-by: Caterina Shablia <[email protected]> > Reviewed-by: Boris Brezillon <[email protected]> > Reviewed-by: Liviu Dudau <[email protected]> Queued to drm-misc-next. > --- > include/uapi/drm/drm_fourcc.h | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h > index e527b24bd824..452f901513ad 100644 > --- a/include/uapi/drm/drm_fourcc.h > +++ b/include/uapi/drm/drm_fourcc.h > @@ -1422,6 +1422,22 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 > modifier) > #define DRM_FORMAT_MOD_ARM_16X16_BLOCK_U_INTERLEAVED \ > DRM_FORMAT_MOD_ARM_CODE(DRM_FORMAT_MOD_ARM_TYPE_MISC, 1ULL) > > +/* > + * ARM 64k interleaved modifier > + * > + * This is used by ARM Mali v10+ GPUs. With this modifier, the plane is > divided > + * into 64k byte 1:1 or 2:1 -sided tiles. The 64k tiles are laid out > linearly. > + * Each 64k tile is divided into blocks of 16x16 texel blocks, which are > + * themselves laid out linearly within a 64k tile. Then within each 16x16 > + * block, texel blocks are laid out according to U order, similar to > + * 16X16_BLOCK_U_INTERLEAVED. > + * > + * Note that unlike 16X16_BLOCK_U_INTERLEAVED, the layout does not change > + * depending on whether a format is compressed or not. > + */ > +#define DRM_FORMAT_MOD_ARM_INTERLEAVED_64K \ > + DRM_FORMAT_MOD_ARM_CODE(DRM_FORMAT_MOD_ARM_TYPE_MISC, 2ULL) > + > /* > * Allwinner tiled modifier > * > > base-commit: f08f665f8cda9520d98ee24545d306a92f386616
