On Mon, Dec 05, 2016 at 12:46:14PM -0700, Jason Gunthorpe wrote:
In any event the allocator still needs to track which regions are in
use and be able to hook 'free' from userspace. That does suggest it
should be integrated into the nvme driver and not a bolt on driver..
Two totally different use cases:
- a card that exposes directly byte addressable storage as a PCI-e
bar. Thin of it as a nvdimm on a PCI-e card. That's the iopmem
- the NVMe CMB which exposes a byte addressable indirection buffer for
I/O, but does not actually provide byte addressable persistent
storage. This is something that needs to be added to the NVMe driver
(and the block layer for the abstraction probably).