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Align SDHCI DMA bounce buffer to PAGE_SIZE
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Authored by mw on Nov 1 2020, 5:12 PM.

Details

Reviewers
manu
mmel
andrew
Summary

r366106 extended the number of bounce cases for arm64 busdma.
As a result the DMA memory allocation in sdhci_dma_alloc()
started failing with EFIBG error. It turned out, that a huge
alignment value (4K-512K) passed to bus_dma_tag_create()
can be problematic. Limit the bounce buffer alignment to
the PAGE_SIZE.

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rS FreeBSD src repository - subversion
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mw requested review of this revision.Nov 1 2020, 5:12 PM

I think it's wrong. In this case, multi-page alignment is required, the old comment is correct. Please see https://reviews.freebsd.org/D26735. I plan to commit this in the next day or two.