On Tue, Dec 17, 2019 at 06:07:26PM +0100, Auger Eric wrote: > Hi Jean, > > On 12/9/19 7:05 PM, Jean-Philippe Brucker wrote: > > s/Propate/Propagate in the commit title. > > Now that we support substream IDs, initialize s1cdmax with the number of > > SSID bits supported by a master and the SMMU. > > > > Context descriptor tables are allocated once for the first master > > attached to a domain. Therefore attaching multiple devices with > > different SSID sizes is tricky, and we currently don't support it. > > > > As a future improvement it would be nice to at least support attaching a > > SSID-capable device to a domain that isn't using SSID, by reallocating > > the SSID table. > Isn't that use case relevant (I mean using both devices in a non SSID > use case). For platform devices you can work this around with FW but for > PCI devices? Normally each device gets its own domain. Especially since PASID is a PCI Express capability, I expect them to be properly isolated with ACS, each with its own IOMMU group. So I don't think this is too relevant for the moment, it would be a quirk for a broken system. Thanks, Jean
