x86/amd_node: Add support for debugfs access to SMN registers

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There are certain registers on AMD Zen systems that can only be accessed
through SMN.

Introduce a new interface that provides debugfs files for accessing SMN.  As
this introduces the capability for userspace to manipulate the hardware in
unpredictable ways, taint the kernel when writing.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250130-wip-x86-amd-nb-cleanup-v4-3-b5cc997e471b@amd.com

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Mario Limonciello 2025-01-30 19:48:57 +00:00 • committed by Ingo Molnar

parent 8351845307

commit 9c19cc1f5f

1 changed files with 99 additions and 0 deletions

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arch/x86/kernel/amd_node.c

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