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    Subject[PATCH v9 17/30] x86/PCI: Refine pci_acpi_scan_root() with generic pci_host_bridge
    Date
    Signed-off-by: Yijing Wang <wangyijing@huawei.com>
    CC: Thomas Gleixner <tglx@linutronix.de>
    CC: x86@kernel.org
    ---
    arch/x86/pci/acpi.c | 37 +++++++++++++++++++++----------------
    1 files changed, 21 insertions(+), 16 deletions(-)

    diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
    index d2655d5..877acaf 100644
    --- a/arch/x86/pci/acpi.c
    +++ b/arch/x86/pci/acpi.c
    @@ -349,6 +349,19 @@ static void probe_pci_root_info(struct pci_root_info *info,
    entry->res->name = info->name;
    }

    +static int pci_host_bridge_prepare(struct pci_host_bridge *bridge)
    +{
    + struct pci_sysdata *sd = dev_get_drvdata(&bridge->dev);
    +
    + ACPI_COMPANION_SET(&bridge->dev, sd->companion);
    + return 0;
    +}
    +
    +static struct pci_host_bridge_ops pci_host_ops = {
    + .pci_ops = &pci_root_ops,
    + .prepare = pci_host_bridge_prepare,
    +};
    +
    struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
    {
    struct acpi_device *device = root->device;
    @@ -359,6 +372,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
    LIST_HEAD(crs_res);
    LIST_HEAD(resources);
    struct pci_bus *bus;
    + struct pci_host_bridge *host = NULL;
    struct pci_sysdata *sd;
    int node;

    @@ -425,14 +439,13 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)

    if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
    (u8)root->secondary.end, root->mcfg_addr))
    - bus = pci_create_root_bus(NULL, domain, busnum,
    - &pci_root_ops, sd, &resources);
    -
    - if (bus) {
    - pci_scan_child_bus(bus);
    - pci_set_host_bridge_release(
    - to_pci_host_bridge(bus->bridge),
    - release_pci_root_info, info);
    + host = pci_scan_host_bridge(NULL, domain, busnum, sd,
    + &resources, &pci_host_ops);
    +
    + if (host) {
    + bus = host->bus;
    + pci_set_host_bridge_release(host,
    + release_pci_root_info, info);
    } else {
    resource_list_free(&resources);
    teardown_mcfg_map(info);
    @@ -455,14 +468,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
    return bus;
    }

    -int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
    -{
    - struct pci_sysdata *sd = bridge->bus->sysdata;
    -
    - ACPI_COMPANION_SET(&bridge->dev, sd->companion);
    - return 0;
    -}
    -
    int __init pci_acpi_init(void)
    {
    struct pci_dev *dev = NULL;
    --
    1.7.1


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