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    Subject[PATCH 13/16 v6] PCI: reserve bus range for SR-IOV device
    Reserve bus range for SR-IOV at device scanning stage.

    Cc: Alex Chiang <achiang@hp.com>
    Cc: Grant Grundler <grundler@parisc-linux.org>
    Cc: Greg KH <greg@kroah.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
    Cc: Matthew Wilcox <matthew@wil.cx>
    Cc: Randy Dunlap <randy.dunlap@oracle.com>
    Cc: Roland Dreier <rdreier@cisco.com>
    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 dd299aa..c86bd54 100644
    --- a/drivers/pci/iov.c
    +++ b/drivers/pci/iov.c
    @@ -498,6 +498,30 @@ int pci_iov_resource_bar(struct pci_dev *dev, int resno,
    }

    /**
    + * 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;
    +}
    +
    +/**
    * pci_iov_register - register SR-IOV service
    * @dev: the PCI device
    * @callback: callback function for SR-IOV events
    diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
    index 7735d92..5206ae7 100644
    --- a/drivers/pci/pci.h
    +++ b/drivers/pci/pci.h
    @@ -204,6 +204,7 @@ 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)
    {
    @@ -227,6 +228,10 @@ 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 18ce9c0..50a1380 100644
    --- a/drivers/pci/probe.c
    +++ b/drivers/pci/probe.c
    @@ -1068,6 +1068,9 @@ 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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