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