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arm64: Add a VM_FREELIST_DMA32 freelist

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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, so that such memory allocation failures are less likely to occur.

Reviewed by:	alc
MFC after:	1 month
Sponsored by:	Klara, Inc.
Sponsored by:	Juniper Networks, Inc.
Differential Revision:	https://reviews.freebsd.org/D43503

(cherry picked from commit 48d5dab7bace6bae938672784ca3aa8733d72eb9)
This commit is contained in:
Mark Johnston 2024-01-25 16:33:46 -05:00
parent 428e5165fe
commit 69c4a0ef86
1 changed files with 5 additions and 3 deletions
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8
sys/arm64/include/vmparam.h
View file

@ -85,11 +85,13 @@
#define VM_FREEPOOL_DIRECT 1
/*
* Create one free page lists: VM_FREELIST_DEFAULT is for all physical
* pages.
* Create two free page lists: VM_FREELIST_DMA32 is for physical pages that have
* physical addresses below 4G, and VM_FREELIST_DEFAULT is for all other
* physical pages.
*/
#define VM_NFREELIST 1
#define VM_NFREELIST 2
#define VM_FREELIST_DEFAULT 0
#define VM_FREELIST_DMA32 1
/*
* When PAGE_SIZE is 4KB, an allocation size of 16MB is supported in order