PCI: initialize and release SR-IOV capability

If a device has the SR-IOV capability, initialize it (set the ARI
Capable Hierarchy in the lowest numbered PF if necessary; calculate
the System Page Size for the VF MMIO, probe the VF Offset, Stride
and BARs). A lock for the VF bus allocation is also initialized if
a PF is the lowest numbered PF.

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, 37 insertions, 0 deletions

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 2cd1cba7236f..7d5327c986f5 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -201,4 +201,41 @@ resource_size_t pci_specified_resource_alignment(struct pci_dev *dev);
 extern void pci_disable_bridge_window(struct pci_dev *dev);
 #endif
 
+/* Single Root I/O Virtualization */
+struct pci_sriov {
+        int pos;                /* capability position */
+        int nres;               /* number of resources */
+        u32 cap;                /* SR-IOV Capabilities */
+        u16 ctrl;               /* SR-IOV Control */
+        u16 total;              /* total VFs associated with the PF */
+        u16 offset;             /* first VF Routing ID offset */
+        u16 stride;             /* following VF stride */
+        u32 pgsz;               /* page size for BAR alignment */
+        u8 link;                /* Function Dependency Link */
+        struct pci_dev *dev;    /* lowest numbered PF */
+        struct pci_dev *self;   /* this PF */
+        struct mutex lock;      /* lock for VF bus */
+};
+
+#ifdef CONFIG_PCI_IOV
+extern int pci_iov_init(struct pci_dev *dev);
+extern void pci_iov_release(struct pci_dev *dev);
+extern int pci_iov_resource_bar(struct pci_dev *dev, int resno,
+                                enum pci_bar_type *type);
+#else
+static inline int pci_iov_init(struct pci_dev *dev)
+{
+        return -ENODEV;
+}
+static inline void pci_iov_release(struct pci_dev *dev)
+
+{
+}
+static inline int pci_iov_resource_bar(struct pci_dev *dev, int resno,
+                                       enum pci_bar_type *type)
+{
+        return 0;
+}
+#endif /* CONFIG_PCI_IOV */
+
 #endif /* DRIVERS_PCI_H */