On Tue, Feb 05, 2019 at 05:20:57PM +0100, Thierry Reding wrote: > The problem is that if I use dma_alloc_coherent(), then the memory will > already be mapped via the SMMU at that point and then the driver, not > knowing that memory has already been mapped, will attempt to map an IOVA > which will cause an SMMU fault when the host1x tries to access the > memory. > > I didn't find an equivalent to arm_iommu_detach_device() for non-ARM, > but then stumbled across this and thought it was rather convenient for > these cases. If there's a better way to deal with this situation, I'd be > happy to do so.
So you basically do a dma_direct_alloc + iommu_map? Can you send me a pointer to your code? Maybe we need to add a proper IOMMU-layer API for that.
