I'm working on CXL 2.0 type 3 memory devices [1]. In short, these are PCIe devices that have persistent memory on them. As such, it would be nice to inherit from both a PCI_DEVICE class as well as an NVDIMM device class.
Truth be told, using TYPE_MEMORY_DEVICE as the interface does provide most of what I need. I'm wondering what the best way to handle this is. Currently, the only thing NVDIMM class provides is write/read_label_data, this is driven by _DSM. For CXL, the mechanism to read/write the equivalent area is not done via _DSM, but done directly via a mailbox interface. However, the intent is the same, and so utilizing similar code seems ideal. If there's a desire to unify these code paths, I'd need something like multiple inheritance. I'm looking for some feedback here on how to do it. Thanks. Ben [1]: https://lore.kernel.org/qemu-devel/20210105165323.783725-1-ben.widaw...@intel.com/
