On Wed, Nov 04, 2015 at 09:44:40PM +0800, Peng Fan wrote: > Hi Will, Hello,
> I am trying to enable SMMU(mmu500) on an platform. > My platform support only 32 SIDs, but it have more than 100 masters. > So I need to let different masters share one SID. I read current > arm-smmu.c, but it needs each master has unique SID. Do you have > some suggestions about how to let different masters sharing one > SID? We can achieve that using iommu_groups, but then we need a way to describe those groups in the device-tree, as opposed to putting each device into its own group like we do at present. Robin (CC'd) had some work-in-progress for this, iirc. > On my platform, SID can be dynamically programmed. So I can program > DMA0 and DMA1 using one SID, saying 0x5. But I do not have a good > idea how to support this use case in arm-smmu.c driver. I think we've have the firmware allocating the SIDs, then describing the grouping to Linux in the device-tree. Will _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
