linux-kernel - Re: [PATCH v3 0/2] PRM handler direct call interface

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Message-ID: <20240801124926.GBZquEVgG3y2PhefHT@fat_crate.local>
Date: Thu, 1 Aug 2024 14:49:26 +0200
From: Borislav Petkov <bp@...en8.de>
To: John Allen <john.allen@....com>
Cc: rafael@...nel.org, lenb@...nel.org, yazen.ghannam@....com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-edac@...r.kernel.org
Subject: Re: [PATCH v3 0/2] PRM handler direct call interface

On Tue, Jul 30, 2024 at 03:17:29PM +0000, John Allen wrote:
> 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: 8400291e289ee6b2bf9779ff1c83a291501f017b
> 
> 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/Kconfig    |  4 +++
>  drivers/ras/amd/atl/Makefile   |  2 ++
>  drivers/ras/amd/atl/internal.h | 10 ++++++
>  drivers/ras/amd/atl/prm.c      | 57 ++++++++++++++++++++++++++++++++++
>  drivers/ras/amd/atl/umc.c      |  5 +++
>  include/linux/prmt.h           |  5 +++
>  7 files changed, 107 insertions(+)
>  create mode 100644 drivers/ras/amd/atl/prm.c
> 
> -- 

Applied, thanks.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette