[Xen-devel] [xen/stable-2.6.32.x PATCH 1/5] pci: Add SR-IOV convenience functions and macros

["Rose, Gregory V" <gregory.v.rose@xxxxxxxxx>]

pci: Add SR-IOV convenience functions and macros
    
Add and export pci_num_vf to allow other subsystems to determine how many
virtual function devices are associated with an SR-IOV physical function
device.
Add macros dev_is_pci, dev_is_ps, and dev_num_vf to make it easier for
non-PCI specific code to determine SR-IOV capabilities.

Signed-off-by: Greg Rose <gregory.v.rose@xxxxxxxxx>
CC: Mitch Williams <mitch.a.williams@xxxxxxxxx>
    
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index e03fe98..f9db891 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -706,6 +706,21 @@ irqreturn_t pci_sriov_migration(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(pci_sriov_migration);
 
+/**
+ * pci_num_vf - return number of VFs associated with a PF device_release_driver
+ * @dev: the PCI device
+ *
+ * Returns number of VFs, or 0 if SR-IOV is not enabled.
+ */
+int pci_num_vf(struct pci_dev *dev)
+{
+       if (!dev || !dev->is_physfn)
+               return 0;
+       else
+               return dev->sriov->nr_virtfn;
+}
+EXPORT_SYMBOL_GPL(pci_num_vf);
+
 static int ats_alloc_one(struct pci_dev *dev, int ps)
 {
        int pos;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e07d194..ca28e46 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -609,6 +609,9 @@ extern void pci_remove_bus_device(struct pci_dev *dev);
 extern void pci_stop_bus_device(struct pci_dev *dev);
 void pci_setup_cardbus(struct pci_bus *bus);
 extern void pci_sort_breadthfirst(void);
+#define dev_is_pci(d) ((d)->bus == &pci_bus_type)
+#define dev_is_pf(d) ((dev_is_pci(d) ? to_pci_dev(d)->is_physfn : false))
+#define dev_num_vf(d) ((dev_is_pci(d) ? pci_num_vf(to_pci_dev(d)) : 0))
 
 /* Generic PCI functions exported to card drivers */
 
@@ -1124,6 +1127,9 @@ static inline struct pci_dev 
*pci_get_bus_and_slot(unsigned int bus,
                                                unsigned int devfn)
 { return NULL; }
 
+#define dev_is_pci(d) (false)
+#define dev_is_pf(d) (false)
+#define dev_num_vf(d) (0)
 #endif /* CONFIG_PCI */
 
 /* Include architecture-dependent settings and functions */
@@ -1279,6 +1285,7 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int 
bar);
 extern int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
 extern void pci_disable_sriov(struct pci_dev *dev);
 extern irqreturn_t pci_sriov_migration(struct pci_dev *dev);
+extern int pci_num_vf(struct pci_dev *dev);
 #else
 static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
 {
@@ -1291,6 +1298,10 @@ static inline irqreturn_t pci_sriov_migration(struct 
pci_dev *dev)
 {
        return IRQ_NONE;
 }
+static inline int pci_num_vf(struct pci_dev *dev)
+{
+       return 0;
+}
 #endif
 
 #if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)



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