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: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index b2a448e..3e5ab2b 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -706,6 +706,21 @@
}
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 174e539..59a98e2 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -612,6 +612,9 @@
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 */
@@ -1129,6 +1132,9 @@
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 */
@@ -1286,6 +1292,7 @@
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)
{
@@ -1298,6 +1305,10 @@
{
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)