RFC: ARM && restricted DMA apparently not working
From: Jim Quinlan
Date: Tue Sep 26 2023 - 13:52:20 EST
We've just started using the resticted memory feature (DMA_RESTRICTED_POOL)
which isolates a region for DMA memory for a particular device,
SWIOTLB-style. This feature works with ARCH=arm64 but does not work on
ARCH=arm unless I apply the commit to select DMA_DIRECT_REMAP. This seems
to hold from 5.15 to the present.
I've noticed that arm64 selects DMA_DIRECT_REMAP and arm does not and I'm
guessing that there may be a reason for this?
Regards,
Jim Quinlan
Broadcom STB/CM
Jim Quinlan (1):
ARM: Select DMA_DIRECT_REMAP to fix restricted memory
arch/arm/Kconfig | 1 +
1 file changed, 1 insertion(+)
base-commit: 6465e260f48790807eef06b583b38ca9789b6072
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2.17.1
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