On 17.01.25 16:06, Andrew Lunn wrote: >> With this proposal ism_loopback is just another ism device and SMC-D will >> handle removal just like ism_client.remove(ism_dev) of other ism devices. > > In Linux terminology, a device is something which has a struct device, > and a device lives on some sort of bus, even if it is a virtual > bus. Will ISM devices properly fit into the Linux device driver model? > > Andrew > ism_vpci lives on a pci bus (zpci flavor) today. The fact that it is not backed by a real hardware PCI slot, but emulated by s390 firmware is not visible to Linux. In the first proposal, ism_lo lived in on a virtual bus, afaiu. I liked that. In the current stage 1 implementation that is currently upstream, it is not visible in sysfs :-( ism_dev is a bit modeled after net_device. So it is contains a pointer to a struct device, but it is not the device itself. I have to admit that the sysfs details are a bit confusing to me, so I wanted to discuss them first before adding them to the RFC. But I tried to bring all the prereqs in place.
