Platform Runtime Mechanism (PRM) introduces a means for the AML interpreter and OS drivers to invoke runtime handlers from platform firmware in order to remove the need for certain classes of SMIs. Further details can be seen in the PRM specification[1]. Future AMD platforms will implement a PRM module in firmware that will include handlers for performing various types of address translation. The address translation PRM module is documented in chapter 22 of the publicly available "AMD Family 1Ah Models 00h–0Fh and Models 10h–1Fh ACPI v6.5 Porting Guide"[2]. While the kernel currently has support for calling PRM handlers from the AML interpreter, it does not support calling PRM handlers directly from OS drivers. This series implements the direct call interface and uses it for translating normalized addresses to system physical addresses. Thanks, John [1]: https://uefi.org/sites/default/files/resources/Platform%20Runtime%20Mechanism%20-%20with%20legal%20notice.pdf [2]: https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/programmer-references/58088-0.75-pub.pdf Tree: git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Base commit: 4cece764965020c22cff7665b18a012006359095 John Allen (2): ACPI: PRM: Add PRM handler direct call support ras/amd/atl: Translate normalized to system physical addresses using PRM drivers/acpi/prmt.c | 24 ++++++++++++++ drivers/ras/amd/atl/Makefile | 1 + drivers/ras/amd/atl/internal.h | 2 ++ drivers/ras/amd/atl/prm.c | 58 ++++++++++++++++++++++++++++++++++ drivers/ras/amd/atl/umc.c | 5 +++ include/linux/prmt.h | 5 +++ 6 files changed, 95 insertions(+) create mode 100644 drivers/ras/amd/atl/prm.c -- 2.34.1
