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Subject[PATCH v2 33/37] x86, PCI: Add pcibios_root_rescan()
Date
Need use it to rescan root bus that was not added via acpi probe.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/include/asm/pci.h | 2 ++
arch/x86/pci/legacy.c | 25 +++++++++++++++++++++++++
2 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index bb015c7..332c191 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -30,6 +30,8 @@ extern struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops,
int node);
extern struct pci_bus *pci_scan_bus_with_sysdata(int busno);

+void pcibios_root_rescan(void);
+
#ifdef CONFIG_PCI

#ifdef CONFIG_PCI_DOMAINS
diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index aab0e41..251f838 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -79,3 +79,28 @@ int __init pci_subsys_init(void)
return 0;
}
subsys_initcall(pci_subsys_init);
+
+void __ref pcibios_root_rescan(void)
+{
+ int busn;
+ struct pci_bus *bus;
+
+ if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
+ return;
+
+ for (busn = 0; busn <= pcibios_last_bus; busn++) {
+ bus = pci_find_bus(0, busn);
+
+ if (bus)
+ continue;
+
+ bus = __pcibios_scan_specific_bus(busn, false);
+
+ if (!bus)
+ continue;
+
+ pci_assign_unassigned_bus_resources(bus);
+
+ pci_bus_add_devices(bus);
+ }
+}
--
1.7.7


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