x86/resctrl: Refactor resctrl_arch_rmid_read()

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[ Upstream commit 7c9ac605e2 ]

resctrl_arch_rmid_read() adjusts the value obtained from MSR_IA32_QM_CTR to
account for the overflow for MBM events and apply counter scaling for all the
events. This logic is common to both reading an RMID and reading a hardware
counter directly.

Refactor the hardware value adjustment logic into get_corrected_val() to
prepare for support of reading a hardware counter.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
Stable-dep-of: 15292f1b4c ("x86/resctrl: Fix miscount of bandwidth event when reactivating previously unavailable RMID")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Babu Moger 2025-10-20 12:38:52 -04:00 • committed by Greg Kroah-Hartman

parent 78a2d39e2e

commit 12e3db99bc

1 changed files with 23 additions and 15 deletions

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arch/x86/kernel/cpu/resctrl/monitor.c

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