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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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