Page MenuHomeFreeBSD

subr_devmap: Implement pmap_mapdev with pmap_mapdev_attr
ClosedPublic

Authored by andrew on May 12 2025, 1:05 PM.
Tags
None
Referenced Files
Unknown Object (File)
Tue, Oct 7, 12:58 AM
Unknown Object (File)
Sun, Sep 28, 3:35 PM
Unknown Object (File)
Fri, Sep 26, 3:51 AM
Unknown Object (File)
Wed, Sep 24, 8:12 AM
Unknown Object (File)
Sat, Sep 20, 5:05 PM
Unknown Object (File)
Sep 6 2025, 9:37 AM
Unknown Object (File)
Sep 5 2025, 9:07 AM
Unknown Object (File)
Sep 4 2025, 2:56 PM
Subscribers

Details

Summary

We can now support pmap_mapdev_attr on arm. Switch to use this to
implement pmap_mapdev to reduce duplicate code.

Sponsored by: Arm Ltd

Diff Detail

Repository
rG FreeBSD src repository
Lint
Lint Not Applicable
Unit
Tests Not Applicable

Event Timeline

This revision is now accepted and ready to land.May 12 2025, 4:03 PM

Only call devmap_ptov for device mappings

This revision now requires review to proceed.May 13 2025, 10:29 AM
mmel added inline comments.
sys/kern/subr_devmap.c
266

I'm afraid that multiple mappings of the same page with different cache or type properties leads to undefined behavior on most (if not all) architectures. In this case, I don't see a solution other than panic().

KASSERT ma == VM_MEMATTR_DEVICE

This revision is now accepted and ready to land.May 14 2025, 6:26 PM