Hey Jean, On 2017/10/6 21:31, Jean-Philippe Brucker wrote: > IOMMU drivers need a way to bind Linux processes to devices. This is used > for Shared Virtual Memory (SVM), where devices support paging. In that > mode, DMA can directly target virtual addresses of a process. > > Introduce boilerplate code for allocating process structures and binding > them to devices. Four operations are added to IOMMU drivers: > > * process_alloc, process_free: to create an iommu_process structure and > perform architecture-specific operations required to grab the process > (for instance on ARM SMMU, pin down the CPU ASID). There is a single > iommu_process structure per Linux process. > I'm a bit confused here. The original meaning of iommu_domain is a virtual addrspace defined by a set of io page table. (fix me if I misunderstood). Then what's the meaning of iommu_domain and iommu_process after introducing iommu_process? Could you consider document these concepts? Thanks, Liubo
