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    Subject[PATCH v4 13/30] PCI: Introduce new scan function pci_scan_root_bridge()
    Date
    Introduce new scan function pci_scan_root_bridge() to
    support host bridge drivers that need to provide platform
    own pci_host_bridge_ops.

    Signed-off-by: Yijing Wang <wangyijing@huawei.com>
    ---
    drivers/pci/probe.c | 21 +++++++++++++++++++++
    include/linux/pci.h | 3 +++
    2 files changed, 24 insertions(+), 0 deletions(-)

    diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
    index 8cec6ab..b5f9ca4 100644
    --- a/drivers/pci/probe.c
    +++ b/drivers/pci/probe.c
    @@ -2063,6 +2063,27 @@ static struct pci_bus *__pci_scan_root_bus(
    return b;
    }

    +struct pci_host_bridge *pci_scan_root_bridge(struct device *parent,
    + u32 db, struct pci_ops *ops, void *sysdata,
    + struct list_head *resources, struct pci_host_bridge_ops *phb_ops)
    +{
    + struct pci_host_bridge *host;
    + struct pci_bus *bus;
    +
    + host = pci_create_host_bridge(parent, db, resources,
    + sysdata, phb_ops);
    + if (!host)
    + return NULL;
    +
    + bus = __pci_scan_root_bus(host, ops);
    + if (!bus)
    + pci_free_host_bridge(host);
    +
    + return host;
    +}
    +EXPORT_SYMBOL(pci_scan_root_bridge);
    +
    +
    struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db,
    struct pci_ops *ops, void *sysdata, struct list_head *resources)
    {
    diff --git a/include/linux/pci.h b/include/linux/pci.h
    index a4b56e0..ef3a821 100644
    --- a/include/linux/pci.h
    +++ b/include/linux/pci.h
    @@ -793,6 +793,9 @@ void pci_bus_release_busn_res(struct pci_bus *b);
    struct pci_bus *pci_scan_root_bus(struct device *parent, u32 dombus,
    struct pci_ops *ops, void *sysdata,
    struct list_head *resources);
    +struct pci_host_bridge *pci_scan_root_bridge(struct device *parent,
    + u32 dombus, struct pci_ops *ops, void *sysdata,
    + struct list_head *resources, struct pci_host_bridge_ops *phb_ops);
    struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
    int busnr);
    void pcie_update_link_speed(struct pci_bus *bus, u16 link_status);
    --
    1.7.1


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