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authorDonald Dutile <ddutile@redhat.com>2012-11-06 00:20:36 +0400
committerBjorn Helgaas <bhelgaas@google.com>2012-11-10 07:10:39 +0400
commit1789382a72a537447d65ea4131d8bcc1ad85ce7b (patch)
treea22142cf3882ccf95e9be73642d3738fb5a72af1 /include/linux
parent625e1d59a89f50bace376f429d8cf50347af75f7 (diff)
downloadlinux-1789382a72a537447d65ea4131d8bcc1ad85ce7b.tar.xz
PCI: SRIOV control and status via sysfs
Provide files under sysfs to determine the maximum number of VFs an SR-IOV-capable PCIe device supports, and methods to enable and disable the VFs on a per-device basis. Currently, VF enablement by SR-IOV-capable PCIe devices is done via driver-specific module parameters. If not setup in modprobe files, it requires admin to unload & reload PF drivers with number of desired VFs to enable. Additionally, the enablement is system wide: all devices controlled by the same driver have the same number of VFs enabled. Although the latter is probably desired, there are PCI configurations setup by system BIOS that may not enable that to occur. Two files are created for the PF of PCIe devices with SR-IOV support: sriov_totalvfs Contains the maximum number of VFs the device could support as reported by the TotalVFs register in the SR-IOV extended capability. sriov_numvfs Contains the number of VFs currently enabled on this device as reported by the NumVFs register in the SR-IOV extended capability. Writing zero to this file disables all VFs. Writing a positive number to this file enables that number of VFs. These files are readable for all SR-IOV PF devices. Writes to the sriov_numvfs file are effective only if a driver that supports the sriov_configure() method is attached. Signed-off-by: Donald Dutile <ddutile@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/pci.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index ee2179546c63..7ef8fba319da 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -573,6 +573,7 @@ struct pci_driver {
int (*resume_early) (struct pci_dev *dev);
int (*resume) (struct pci_dev *dev); /* Device woken up */
void (*shutdown) (struct pci_dev *dev);
+ int (*sriov_configure) (struct pci_dev *dev, int num_vfs); /* PF pdev */
const struct pci_error_handlers *err_handler;
struct device_driver driver;
struct pci_dynids dynids;