linux-kernel - [PATCH v1] drm: add ARM interleaved 64k modifier

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Message-ID: <20260123212327.83064-1-caterina.shablia@collabora.com>
Date: Fri, 23 Jan 2026 21:23:25 +0000
From: Caterina Shablia <caterina.shablia@...labora.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>
Cc: kernel@...labora.com,
	Caterina Shablia <caterina.shablia@...labora.com>,
	"Boris Brezillon" <boris.brezillon@...labora.com>,
	"Steven Price" <steven.price@....com>,
	"Liviu Dudau" <liviu.dudau@....com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1] drm: add ARM interleaved 64k modifier

This modifier is 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 arrangement of texel blocks is very similar
to block U-interleaved. Tiles are laid out linearly. Tiles are
always 64k bytes in size and are 1:1-sided rectangles when texel
block is 1 byte or a multiple of 4 bytes, and 2:1-sided otherwise.
Only power of two byte texel blocks can be used with this modifier.
Within a single tile, texels are arranged according to U-interleaving.

Unlike block U-interleaved, the layout depends solely on texel block
size and doesn't change depending on whether the image 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

Signed-off-by: Caterina Shablia <caterina.shablia@...labora.com>
---
 include/uapi/drm/drm_fourcc.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index e527b24bd824..0da2c880e08c 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -1422,6 +1422,16 @@ 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. It's basically the same as 16x16 block
+ * U-interleaved, but within 64k-byte 1:1 or 2:1 -sided tiles. Tiles themselves
+ * are laid out linearly.
+ */
+#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
-- 
2.47.3