On Thu, Apr 01, 2021 at 05:47:19PM +0200, Jean-Philippe Brucker wrote: > The SMMU provides a Stall model for handling page faults in platform > devices. It is similar to PCIe PRI, but doesn't require devices to have > their own translation cache. Instead, faulting transactions are parked > and the OS is given a chance to fix the page tables and retry the > transaction. > > Enable stall for devices that support it (opt-in by firmware). When an > event corresponds to a translation error, call the IOMMU fault handler. > If the fault is recoverable, it will call us back to terminate or > continue the stall. Which hardware is this useful for? Stalling adds a fair amount of complexity to the driver, so I don't think we should support it unless we're likely to see platforms that both implement it and do something useful with it. Will
