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  • LINUX内核PCI扫描过程

    LINUX内核PCI扫描过程

    内核版本 3.10.103

    1. ACPI热插拔扫描
    subsys_initcall(acpi_init)@drivers/acpi/bus.c
     |-acpi_scan_init@drivers/acpi/scan.c
       |->acpi_pci_root_init@drivers/acpi/pci_root.c
       |    |->acpi_scan_add_handler(&pci_root_handler)@drivers/acpi/scan.c
       |            |->list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
       |->acpi_pci_link_init@drivers/acpi/pci_link.c
       |    |->acpi_scan_add_handler(&pci_link_handler);
       |->acpi_bus_scan(ACPI_ROOT_OBJECT)
                   |->acpi_bus_scan@drivers/acpi/scan.c
                      |->acpi_walk_namespace@drivers/acpi/acpica/nsxfeval.c
                              |->acpi_ns_walk_namespace@drivers/acpi/acpica/nswalk.c
                                 |->acpi_bus_device_attach(即post_order_visit)
                                    |->acpi_scan_attach_handler
                                       |->acpi_scan_match_handler
                                          |->handler->attach(即acpi_pci_root_add)
                                               |->pci_acpi_scan_root@arch/x86/pci/probe.c
                                                       |->probe_pci_root_info
                                                       |->pci_scan_child_bus@drivers/pci/probe.c
                                                          |->pci_scan_slot
     

    2. 传统扫描
    subsys_initcall(pci_subsys_init)@arch/x86/pci/legacy.c
     |->pci_legacy_init
        |->pcibios_scan_root@arch/x86/pci/common.c
           |->pci_scan_bus_on_node
                   |->pci_scan_root_bus
                      |->pci_scan_root_bus@drivers/pci/probe.c
                         |->pci_create_root_bus
                         |->pci_scan_child_bus
                            |->pci_scan_slot
                            
                           

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  • 原文地址:https://www.cnblogs.com/mull/p/9337149.html
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