Page MenuHomeFreeBSD

arm64: Add a VM_FREELIST_DMA32 freelist
ClosedPublic

Authored by markj on Jan 18 2024, 7:57 PM.
Tags
None
Referenced Files
F89112174: D43503.id132955.diff
Tue, Jul 23, 3:17 PM
Unknown Object (File)
Fri, Jun 28, 10:19 PM
Unknown Object (File)
Fri, Jun 28, 10:16 PM
Unknown Object (File)
Thu, Jun 27, 5:01 PM
Unknown Object (File)
Wed, Jun 26, 5:51 AM
Unknown Object (File)
Jun 15 2024, 11:04 PM
Unknown Object (File)
Jun 15 2024, 5:39 PM
Unknown Object (File)
Jun 6 2024, 12:08 AM
Subscribers

Details

Summary

When booting a KMSAN kernel on an Ampere Altra, I've seen some boot time
hangs when the XHCI controller driver attempts to allocate memory for
32-bit DMA. The system boots fine with a GENERIC kernel; I believe that
the additional memory requirements of KMSAN push it over the edge. The
system has a bit less than 2GB of RAM below the 4GB boundary.

Allocate a new freelist to segregate memory below 4GB, as we do on
amd64.

Diff Detail

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