PCI: reserve bus range for SR-IOV device

[pandora-kernel.git] / drivers / pci / iov.c

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index b121e47..5ddfc09 100644 (file)
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -14,6 +14,18 @@
 #include "pci.h"
 
 
+static inline u8 virtfn_bus(struct pci_dev *dev, int id)
+{
+       return dev->bus->number + ((dev->devfn + dev->sriov->offset +
+                                   dev->sriov->stride * id) >> 8);
+}
+
+static inline u8 virtfn_devfn(struct pci_dev *dev, int id)
+{
+       return (dev->devfn + dev->sriov->offset +
+               dev->sriov->stride * id) & 0xff;
+}
+
 static int sriov_init(struct pci_dev *dev, int pos)
 {
        int i;
@@ -209,3 +221,27 @@ void pci_restore_iov_state(struct pci_dev *dev)
        if (dev->is_physfn)
                sriov_restore_state(dev);
 }
+
+/**
+ * pci_iov_bus_range - find bus range used by Virtual Function
+ * @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;
+       struct pci_dev *dev;
+
+       list_for_each_entry(dev, &bus->devices, bus_list) {
+               if (!dev->is_physfn)
+                       continue;
+               busnr = virtfn_bus(dev, dev->sriov->total - 1);
+               if (busnr > max)
+                       max = busnr;
+       }
+
+       return max ? max - bus->number : 0;
+}