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Differential D55009

hwpstate_amd(4): 'epp' sysctl leaf to operate on real EPP hardware values
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Authored by olce on Jan 31 2026, 11:49 AM.
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rG951788e3733e: hwpstate_amd(4): 'epp' sysctl leaf to operate on real EPP hardware values
Summary

We were using percents, for compatibility with hwpstate_intel(4), but
this looses granularity that might be important in some scenarios or
with specific CPU models.

For consistency, hwpstate_intel(4) should be changed accordingly, at the
expense of breaking compatibility.

PR: 292615
Sponsored by: The FreeBSD Foundation

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rG FreeBSD src repository
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Event Timeline

olce created this revision.Jan 31 2026, 11:49 AM
Herald added a subscriber: imp. · View Herald TranscriptJan 31 2026, 11:49 AM
olce requested review of this revision.Jan 31 2026, 11:49 AM
Harbormaster completed remote builds in B70281: Diff 170844.Jan 31 2026, 11:49 AM
olce added a parent revision: D55008: hwpstate_amd(4): Factor out setting the CPPC_REQUEST register.Jan 31 2026, 1:26 PM
olce added a child revision: D55010: hwpstate_amd(4): Add knobs to get/set all fields of CPPC_REQUEST.
aokblast accepted this revision.Feb 7 2026, 3:05 AM

LGTM for me but I think we should merge the intel's one at the same time.

This revision is now accepted and ready to land.Feb 7 2026, 3:05 AM
Closed by commit rG951788e3733e: hwpstate_amd(4): 'epp' sysctl leaf to operate on real EPP hardware values (authored by olce). · Explain WhyFeb 11 2026, 8:44 PM
This revision was automatically updated to reflect the committed changes.
olce added a commit: rG951788e3733e: hwpstate_amd(4): 'epp' sysctl leaf to operate on real EPP hardware values.
olce added a comment.Feb 11 2026, 8:45 PM
In D55009#1261034, @aokblast wrote:

LGTM for me but I think we should merge the intel's one at the same time.

I agree, but unfortunately in the immediate I cannot dedicate more time to revamping the Intel driver, and I don't want to hold back these changes for a long while. Perhaps I'll leave that to you when you come back, let's talk about it then.

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sys/
x86/
cpufreq/
21 lines

Diff 171794

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sys/x86/cpufreq/hwpstate_amd.c

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