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Subject[PATCH 7/8 v4] PCI: reserve bus range for the SR-IOV device
Reserve bus range for SR-IOV at device scanning stage.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>

---
drivers/pci/iov.c | 24 ++++++++++++++++++++++++
drivers/pci/pci.h | 5 +++++
drivers/pci/probe.c | 3 +++
3 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 3cf9709..7685c6b 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -603,6 +603,30 @@ void pci_iov_remove_sysfs(struct pci_dev *dev)
kfree(iov->ve);
}

+/**
+ * pci_iov_bus_range - find bus range used by SR-IOV capability
+ * @bus: the PCI bus
+ *
+ * Returns max number of buses (exclude current one) used by Virtual
+ * Functions.
+ */
+int pci_iov_bus_range(struct pci_bus *bus)
+{
+ int max = 0;
+ u8 busnr, devfn;
+ struct pci_dev *dev;
+
+ list_for_each_entry(dev, &bus->devices, bus_list) {
+ if (!dev->iov)
+ continue;
+ vf_rid(dev, dev->iov->totalvfs - 1, &busnr, &devfn);
+ if (busnr > max)
+ max = busnr;
+ }
+
+ return max ? max - bus->number : 0;
+}
+
int pci_iov_resource_align(struct pci_dev *dev, int resno)
{
if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCES_END)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index c66a4bd..71149b5 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -206,6 +206,7 @@ void pci_iov_remove_sysfs(struct pci_dev *dev);
extern int pci_iov_resource_align(struct pci_dev *dev, int resno);
extern int pci_iov_resource_bar(struct pci_dev *dev, int resno,
enum pci_bar_type *type);
+extern int pci_iov_bus_range(struct pci_bus *bus);
#else
static inline int pci_iov_init(struct pci_dev *dev)
{
@@ -229,6 +230,10 @@ static inline int pci_iov_resource_bar(struct pci_dev *dev, int resno,
{
return 0;
}
+extern inline int pci_iov_bus_range(struct pci_bus *bus)
+{
+ return 0;
+}
#endif /* CONFIG_PCI_IOV */

#endif /* DRIVERS_PCI_H */
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 831d8d0..b11f4b8 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1129,6 +1129,9 @@ unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
for (devfn = 0; devfn < 0x100; devfn += 8)
pci_scan_slot(bus, devfn);

+ /* Reserve buses for SR-IOV capability. */
+ max += pci_iov_bus_range(bus);
+
/*
* After performing arch-dependent fixup of the bus, look behind
* all PCI-to-PCI bridges on this bus.
--
1.5.6.4


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