hwpstate_amd(4): CPPC: Allow attaching even if CAPABILITY_1 cannot be read
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Authored by olce on Feb 11 2026, 8:51 PM.

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aokblast
lwhsu
emaste

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rGb69a396de211: hwpstate_amd(4): CPPC: Allow attaching even if CAPABILITY_1 cannot be read

Summary

If that MSR cannot be read, we fallback to defaults specified by the
ACPI specification, as we are already doing when the minimum and maximum
values in there look bogus.

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Repository

rG FreeBSD src repository

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Build Status

Buildable 70626
Build 67509: arc lint + arc unit

Event Timeline

olce created this revision.Feb 11 2026, 8:51 PM

Herald added a subscriber: imp. · View Herald TranscriptFeb 11 2026, 8:51 PM

olce requested review of this revision.Feb 11 2026, 8:51 PM

Harbormaster completed remote builds in B70626: Diff 171797.Feb 11 2026, 8:51 PM

olce added a parent revision: D55251: hwpstate_amd(4): Consistency of cached CPPC_REQUEST value.Feb 11 2026, 8:55 PM

olce added a child revision: D55253: hwpstate_amd(4): CPPC: Switch the default to maximum performance.

olce added subscribers: cracauer, cy.Feb 11 2026, 9:03 PM

This revision was not accepted when it landed; it landed in state Needs Review.Feb 20 2026, 10:13 AM

Closed by commit rGb69a396de211: hwpstate_amd(4): CPPC: Allow attaching even if CAPABILITY_1 cannot be read (authored by olce). · Explain Why

This revision was automatically updated to reflect the committed changes.

olce added a commit: rGb69a396de211: hwpstate_amd(4): CPPC: Allow attaching even if CAPABILITY_1 cannot be read.

Revision Contents
Changeset List

Path

Size

sys/

x86/

cpufreq/

hwpstate_amd.c

45 lines

Diff 171797

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sys/x86/cpufreq/hwpstate_amd.c

hwpstate_amd(4): CPPC: Allow attaching even if CAPABILITY_1 cannot be readClosedPublicActions