nvme-pci: implement host memory buffer support
If a controller supports the host memory buffer we try to provide it with the requested size up to an upper cap set as a module parameter. We try to give as few as possible descriptors, eventually working our way down. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NKeith Busch <keith.busch@intel.com> Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Reviewed-by: NMax Gurtovoy <maxg@mellanox.com> Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de>
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