Hi Douglas,
On Thu, Jun 24, 2021 at 10:17:56AM -0700, Douglas Anderson wrote:
> The goal of this patch series is to get better SD/MMC performance on
> Qualcomm eMMC controllers and in generally nudge us forward on the
> path of allowing some devices to be in strict mode and others to be in
> non-strict mode.
So if I understand it right, this patch-set wants a per-device decision
about setting dma-mode to strict vs. non-strict.
I think we should get to the reason why strict mode is used by default
first. Is the default on ARM platforms to use iommu-strict mode by
default and if so, why?
The x86 IOMMUs use non-strict mode by default (yes, it is a security
trade-off).
Regards,
Joerg
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