26e43c9a - RAS/AMD/ATL: Translate normalized to system physical addresses using PRM

Tue, 30 Jul 2024 15:17:31 +0000

RAS/AMD/ATL: Translate normalized to system physical addresses using PRMAMD Zen-based systems report memory error addresses through machinecheck banks representing Unified Memory Controllers (UMCs) in the formof UMC relative "normalized" addresses. A normalized address must beconverted to a system physical address to be usable by the OS.Future AMD platforms will provide a UEFI PRM module that implements anumber of address translation PRM handlers. This will provide aninterface for the OS to call platform specific code without requiringthe use of SMM or other heavy firmware operations.Add support for the normalized to system physical address translationPRM handler in the AMD Address Translation Library and prefer it overnative code if available. The GUID and parameter buffer structure arespecific to the normalized to system physical address handler providedby the address translation PRM module included in future AMD systems.The address translation PRM module is documented in chapter 22 of thepublicly available "AMD Family 1Ah Models 00h–0Fh and Models 10h–1FhACPI v6.5 Porting Guide". [ bp: Massage commit message. ]Signed-off-by: John Allen Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20240730151731.15363-3-john.allen@amd.com List of files: /linux-6.15/drivers/ras/amd/atl/Makefile

3f317499 - RAS: Introduce AMD Address Translation Library

Tue, 23 Jan 2024 04:13:59 +0000

RAS: Introduce AMD Address Translation LibraryAMD Zen-based systems report memory errors through Machine Check banksrepresenting Unified Memory Controllers (UMCs). The address valuereported for DRAM ECC errors is a "normalized address" that is relativeto the UMC. This normalized address must be converted to a systemphysical address to be usable by the OS.Support for this address translation was introduced to the MCA subsystemwith Zen1 systems. The code was later moved to the AMD64 EDAC module,since this was the only user of the code at the time.However, there are uses for this translation outside of EDAC. The systemphysical address can be used in MCA for preemptive page offlining as donein some MCA notifier functions. Also, this translation is needed as thebasis of similar functionality needed for some CXL configurations on AMDsystems.Introduce a common address translation library that can be used formultiple subsystems including MCA, EDAC, and CXL.Include support for UMC normalized to system physical addresstranslation for current CPU systems.The Data Fabric Indirect register access offsets and one of the registerfields were changed. Default to the current offsets and register fielddefinition. And fallback to the older values if running on a "legacy"system.Provide built-in code to facilitate the loading and unloading of thelibrary module without affecting other modules or built-in code.Signed-off-by: Yazen Ghannam Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20240123041401.79812-2-yazen.ghannam@amd.com List of files: /linux-6.15/drivers/ras/amd/atl/Makefile

Changes in Makefile

26e43c9a - RAS/AMD/ATL: Translate normalized to system physical addresses using PRM

3f317499 - RAS: Introduce AMD Address Translation Library