PCI: add SR-IOV API for Physical Function driver

Add or remove the Virtual Function when the SR-IOV is enabled or
disabled by the device driver. This can happen anytime rather than
only at the device probe stage.

Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 18 insertions, 1 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8ce2f2d9ab63..c2e491e04063 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -265,6 +265,7 @@ struct pci_dev {
         unsigned int    is_pcie:1;
         unsigned int    state_saved:1;
         unsigned int    is_physfn:1;
+        unsigned int    is_virtfn:1;
         pci_dev_flags_t dev_flags;
         atomic_t        enable_cnt;     /* pci_enable_device has been called */
 
@@ -279,7 +280,10 @@ struct pci_dev {
 #endif
         struct pci_vpd *vpd;
 #ifdef CONFIG_PCI_IOV
-        struct pci_sriov *sriov;        /* SR-IOV capability related */
+        union {
+                struct pci_sriov *sriov;        /* SR-IOV capability related */
+                struct pci_dev *physfn; /* the PF this VF is associated with */
+        };
 #endif
 };
 
@@ -1212,5 +1216,18 @@ int pci_ext_cfg_avail(struct pci_dev *dev);
 
 void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
 
+#ifdef CONFIG_PCI_IOV
+extern int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
+extern void pci_disable_sriov(struct pci_dev *dev);
+#else
+static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
+{
+        return -ENODEV;
+}
+static inline void pci_disable_sriov(struct pci_dev *dev)
+{
+}
+#endif
+
 #endif /* __KERNEL__ */
 #endif /* LINUX_PCI_H */