Bodong Wang 0e7df22401
PCI: Add sysfs sriov_drivers_autoprobe to control VF driver binding ...
Sometimes it is not desirable to bind SR-IOV VFs to drivers. This can save
host side resource usage by VF instances that will be assigned to VMs.
Add a new PCI sysfs interface "sriov_drivers_autoprobe" to control that
from the PF. To modify it, echo 0/n/N (disable probe) or 1/y/Y (enable
probe) to:
/sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_drivers_autoprobe
Note that this must be done before enabling VFs. The change will not take
effect if VFs are already enabled. Simply, one can disable VFs by setting
sriov_numvfs to 0, choose whether to probe or not, and then re-enable the
VFs by restoring sriov_numvfs.
[bhelgaas: changelog, ABI doc]
Signed-off-by: Bodong Wang <bodong@mellanox.com >
Signed-off-by: Eli Cohen <eli@mellanox.com >
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com >
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com >
Reviewed-by: Alex Williamson <alex.williamson@redhat.com >
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