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Handling multiple inheritance [for CXL]
From: |
Ben Widawsky |
Subject: |
Handling multiple inheritance [for CXL] |
Date: |
Tue, 26 Jan 2021 13:33:52 -0800 |
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]:
20210105165323.783725-1-ben.widawsky@intel.com/">https://lore.kernel.org/qemu-devel/20210105165323.783725-1-ben.widawsky@intel.com/
- Handling multiple inheritance [for CXL],
Ben Widawsky <=