riscv/pmap.c: Add an Svinval-aware variant of pmap_invalidate_range
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Authored by bnovkov on Wed, Jun 17, 9:23 PM.

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Reviewers

markj
mhorne

Group Reviewers

riscv

Summary

This change introduces a variant of pmap_invalidate_range that uses
the fine-grained TLB invalidation instructions introduced by the
Svinval extension. These instructions allow for more efficient TLB
flushing on certain implementations. Under this new scheme,
pmap_invalidate_range was converted to an ifunc that selects the
appropriate variant during boot.

Event: BSDCan 2026

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Repository

rG FreeBSD src repository

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Buildable 73949
Build 70832: arc lint + arc unit

Event Timeline

bnovkov created this revision.Wed, Jun 17, 9:23 PM

Herald added a subscriber: imp. · View Herald TranscriptWed, Jun 17, 9:23 PM

bnovkov requested review of this revision.Wed, Jun 17, 9:23 PM

Harbormaster completed remote builds in B73949: Diff 179962.Wed, Jun 17, 9:23 PM

bnovkov added a parent revision: D57623: riscv: Add support for the Svinval extension.Wed, Jun 17, 9:24 PM

mhorne accepted this revision.Wed, Jun 24, 2:03 PM

mhorne added a subscriber: mhorne.

mhorne added inline comments.

sys/riscv/riscv/pmap.c
1121–1122

This revision is now accepted and ready to land.Wed, Jun 24, 2:03 PM

mhorne added inline comments.Wed, Jun 24, 2:06 PM

sys/riscv/riscv/pmap.c
1108	The relationship between this check and the definition above was a momentary confusion for me. You might do away with the `atop()` and `PAGE_SIZE` division altogether.

Why not use this for pmap_invalidate_page() as well?

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sys/

riscv/

pmap.c

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Diff 179962

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riscv/pmap.c: Add an Svinval-aware variant of pmap_invalidate_rangeAcceptedPublicActions