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Commit 8effc395 authored by Alexander Duyck's avatar Alexander Duyck Committed by Bjorn Helgaas
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PCI/IOV: Add pci_sriov_configure_simple()



SR-IOV (Single Root I/O Virtualization) is an optional PCIe capability (see
PCIe r4.0, sec 9).  A PCIe Function with the SR-IOV capability is referred
to as a PF (Physical Function).  If SR-IOV is enabled on the PF, several
VFs (Virtual Functions) may be created.  The VFs can be individually
assigned to virtual machines, which allows them to share a single hardware
device while being isolated from each other.

Some SR-IOV devices have resources such as queues and interrupts that must
be set up in the PF before enabling the VFs, so they require a PF driver to
do that.

Other SR-IOV devices don't require any PF setup before enabling VFs.  Add a
pci_sriov_configure_simple() interface so PF drivers for such devices can
use it without repeating the VF-enabling code.

Tested-by: default avatarMark Rustad <mark.d.rustad@intel.com>
Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
[bhelgaas: changelog, comment]
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarGreg Rose <gvrose8192@gmail.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de&gt;:wq>
parent 60cc43fc
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