On Tuesday 10 November 2015 11:00:59 Timur Tabi wrote: > On 11/10/2015 10:47 AM, Arnd Bergmann wrote: > > What BenH was worried about here is that the driver sets different masks > > for streaming and coherent mappings, which is indeed a worry that > > could hit us on ARM as well, but I suppose we'll have to deal with > > that in platform code. > > > > Setting both masks to 32-bit is something that a lot of drivers do, > > and without IOMMU enabled, you'd hit the same bug on all of them. > > Also note that I think that on PowerPC, the mask is set to 32 by default > for all devices. I don't think we do that on ARM64. So on PowerPC, > some drivers get away with not explicitly setting the mask. > If the mask is 64-bit by default on ARM64, that is a bug that we need to fix urgently. Can you verify this? A lot of PCI devices can only do 32-bit DMA, and we have plenty of drivers that don't bother setting a mask at all because the 32-bit mask is the default on all other architectures. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
