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
