After testing, there are more parameters that we're programming which affect how UBWC tiles are laid out in memory and therefore affect the Mesa implementation of VK_EXT_host_image_copy [1], which includes a CPU implementation of tiling and detiling images. In particular we have: 1. ubwc_mode, which is used to enable level 1 bank swizzling to go back to UBWC 1.0 when the implementation supports UBWC 2.0. a610 sets this. 2. macrotile_mode, which we previously left as default but according to downstream we shouldn't for a680. 3. level2_swizzling_dis, which according to downstream has to be set differently for a663. I want as much as possible to avoid problems from people trying to upstream Mesa/kernel support not knowing what they're doing and blindly copying things, so let's make this very explicit that you must set the correct parameters in the kernel and then make sure that Mesa always gets the right parameters from the "source of truth" in the kernel by adding two new UAPI parameters. The Mesa MR has already been updated to use this if available. A secondary goal is to make the adreno settings look more like the MDSS settings, by combining ubwc_mode and level2_swizzling_dis into a single ubwc_swizzle parameter that matches the MDSS one. This will help with creating a single source of truth for all drivers later. The UAPI also matches this, and it makes the Mesa tiling and detiling implementation simpler/more straightforward. For more information on what all these parameters mean, see the comments I've added in the first commit and the giant comment in src/freedreno/fdl/fd6_tiled_memcpy.c I've added in [1]. Testing of the Mesa MR both with and without this series is appreciated, there are many different SoCs out there with different UBWC configurations and I cannot test them all. [1] https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26578 Signed-off-by: Connor Abbott <cwabbott0@xxxxxxxxx> --- Changes in v2: - Move ubwc_config field descriptions to kerneldoc comments on the struct - Link to v1: https://lore.kernel.org/r/20240702-msm-tiling-config-v1-0-adaa6a6e4523@xxxxxxxxx --- Connor Abbott (3): drm/msm: Update a6xx register XML drm/msm: Expand UBWC config setting drm/msm: Expose expanded UBWC config uapi drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 + drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 34 +- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 6 + drivers/gpu/drm/msm/adreno/adreno_gpu.h | 32 +- drivers/gpu/drm/msm/registers/adreno/a6xx.xml | 1617 ++++++++++++++++++++++++- include/uapi/drm/msm_drm.h | 2 + 6 files changed, 1664 insertions(+), 31 deletions(-) --- base-commit: 269b88cb92e62e52718cd44c07b7517265193157 change-id: 20240701-msm-tiling-config-c5f222f5db1c Best regards, -- Connor Abbott <cwabbott0@xxxxxxxxx>
