Differential D50433

hwpmc/arm64: Support 64-bit counters
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Authored by andrew on May 20 2025, 10:42 AM.

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arm64
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rG166d8e4f4786: hwpmc/arm64: Support 64-bit counters

Summary

When FEAT_PMUv3p5 is implemented the event counters become 64-bit. The
PMCR_EL0.LP field is set to move the overflow to be a 64-bit overflow.
As such we ignore it when getting the value for the user as there is
no space in a 64-bit variable to store is.

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rG FreeBSD src repository

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andrew created this revision.May 20 2025, 10:42 AM

Herald added a reviewer: gnn. · View Herald TranscriptMay 20 2025, 10:42 AM

Herald added subscribers: emaste, imp. · View Herald Transcript

andrew requested review of this revision.May 20 2025, 10:42 AM

Harbormaster completed remote builds in B64313: Diff 155742.May 20 2025, 10:42 AM

andrew added a parent revision: D50432: hwpmc/arm64: The counter is 64-bit.May 20 2025, 10:42 AM

andrew added a child revision: D50434: hwpmc/arm64: Hard code the initial pmcr state.

This revision was not accepted when it landed; it landed in state Needs Review.May 28 2025, 1:36 PM

Closed by commit rG166d8e4f4786: hwpmc/arm64: Support 64-bit counters (authored by andrew). · Explain Why

This revision was automatically updated to reflect the committed changes.

andrew added a commit: rG166d8e4f4786: hwpmc/arm64: Support 64-bit counters.

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sys/

dev/

hwpmc/

27 lines

Diff 156185

sys/dev/hwpmc/hwpmc_arm64.c

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