Continued AMD RDNA3 graphics enablement work. AMD SMBA and BMEC QoS features around Slow Memory Bandwidth Allocation and Bandwidth Monitoring Event Configuration for Zen 4 server processors is now ready for the mainline kernel. AMDGPU will now expose more PCIe information to user-space that the Radeon Mesa drivers can leverage for optimized buffer placement and other benefits from this new uAPI. This is very nice for early Radeon customers of future hardware or even now for RDNA3 if you switch to a new kernel but haven't yet upgraded the linux-firmware.git binaries. More graceful handling of the AMD graphics driver for new hardware where the kernel driver may be missing GPU support or not having the necessary GPU firmware binaries.

This just exposes the TPM2 functionality and not any of the other 'scary' Pluton functionality under Linux. Support for Microsoft's Pluton CRB TPM2 found within the newest AMD Ryzen processors. AMD P-State EPP and Auto IBRS make Linux 6.3 exciting on the performance front. This should take care of some of the deficiencies currently seen with the AMD P-State CPU frequency scaling driver code. This is for supporting the Energy Preference Performance (EPP) mode beyond the base amd_pstate driver already mainlined.

AMD P-State EPP is being added to help the performance and power efficiency of modern AMD desktops / laptops / servers.

Automatic IBRS allows less costly Spectre V2 mitigations than using Retpolines. AMD Automatic IBRS to help squeeze a bit more performance out of AMD Zen 4 CPUs. Linux 6.3 stable won't be out until April but some of the AMD code that's slated to land during this merge window based on my monitoring includes: Both for their processors - especially current Zen 4 CPUs - as well as on the graphics side of the house, there is a lot of driver improvements coming with this next kernel version. With the new feature code expected to land over the next two weeks for the Linux 6.3 kernel, this cycle is going to be particularly rich on the AMD side. With the Linux 6.3 merge window opening up following tomorrow's stable debut of the Linux 6.2 kernel, there is a lot to be excited about if you are a customer of AMD's recent CPUs or GPUs.

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