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| author | Bodong Wang <bodong@mellanox.com> | 2017-04-13 01:51:40 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-04-20 08:53:51 -0500 |
| commit | 0e7df22401a3dfd403b26dea62dd00e0598b538b (patch) | |
| tree | 484063ef8f232bf8d51d998a1331513a9f2c8b5a /drivers/pci/iov.c | |
| parent | f65fd1aa4f9881d5540192d11f7b8ed2fec936db (diff) | |
| download | linux-0e7df22401a3dfd403b26dea62dd00e0598b538b.tar.gz | |
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>
Diffstat (limited to 'drivers/pci/iov.c')
| -rw-r--r-- | drivers/pci/iov.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 2479ae876482..d9dc7363ac77 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -450,6 +450,7 @@ found: iov->total_VFs = total; iov->pgsz = pgsz; iov->self = dev; + iov->drivers_autoprobe = true; pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap); pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link); if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) |