Support For AMD GFX11.7 "RDNA 4m" Pending For RADV & RadeonSI Drivers

Back in February we were the first to report on a new AMD "RDNA 4m" target appearing in the AMDGPU LLVM shader compiler. While part of the "RDNA 4" family, it's graphics IP version is GFX 11.7 (GFX1170) that is associated with the RDNA 3 family but with some ISA changes to align it slightly more with the newer RDNA 4 graphics IP. While the RDNA 4m AMDGPU LLVM shader compiler patches have been out for two months, the Mesa patches have only been posted this week for enabling the RADV Vulkan driver and RadeonSI Gallium3D (OpenGL) driver support.

The GFZ 11.7 (GFX1170) graphics IP is for a yet to be announced AMD product. The prior LLVM patches confirm it's an APU product but so far no clear indication what it's for with the latest Ryzen AI 300/400 series using the RDNA 3.5 (GFX115x) IP. But since February, more ISA differences have come to light to better distinguish GFX1170 from other GFX11 GPUs. There have also been GFX1171 and GFX1172 GPU targets also added.

The latest now to report on the RDNA 4m topic are the Mesa enablement patches for RadeonSI and RADV. A set of six Mesa patches are now under review for getting the RDNA 4m support in order with common AMD code changes, the RadeonSI and RADV driver specific changes, and the GFX11.7 ADDRLIB implementation.

Some three thousand lines of new code is needed for bringing up this GFX 11.7 support. It's more than we typically see though going through the patches doesn't reveal any key product details yet for where we'll find this graphics processor. In any event this merge request is now under review ahead of Mesa 26.1 for introducing the RDNA 4m / GFX 11.7 support.