pci: Add a probing code that seeks for an specific bus

This patch adds a probing code that seeks for an specific pci bus. It
still needs testing, but it is hoped that this will help to identify the
memory controller with Xeon 55xx series.

Signed-off-by: Aristeu Sergio <arozansk@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index 1a0422348d6d3f5aae451824c14f65fc0631bfc2..ff5404b82fdc5231b097e4b9b97b3a016bf0269d 100644 (file)
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -53,6 +53,8 @@ extern int pcibios_last_bus;
 extern struct pci_bus *pci_root_bus;
 extern struct pci_ops pci_root_ops;
 
+void pcibios_scan_specific_bus(int busn);
+
 /* pci-irq.c */
 
 struct irq_info {

diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index 0db5eaf54560b3ec1d8083ee8e69d8a1057a045c..c734c277b116047b1d0f4e8ee23f6c12294efca4 100644 (file)
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -11,28 +11,14 @@
  */
 static void __devinit pcibios_fixup_peer_bridges(void)
 {
-       int n, devfn;
-       long node;
+       int n;
 
        if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
                return;
        DBG("PCI: Peer bridge fixup\n");
 
-       for (n=0; n <= pcibios_last_bus; n++) {
-               u32 l;
-               if (pci_find_bus(0, n))
-                       continue;
-               node = get_mp_bus_to_node(n);
-               for (devfn = 0; devfn < 256; devfn += 8) {
-                       if (!raw_pci_read(0, n, devfn, PCI_VENDOR_ID, 2, &l) &&
-                           l != 0x0000 && l != 0xffff) {
-                               DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l);
-                               printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n);
-                               pci_scan_bus_on_node(n, &pci_root_ops, node);
-                               break;
-                       }
-               }
-       }
+       for (n=0; n <= pcibios_last_bus; n++)
+               pcibios_scan_specific_bus(n);
 }
 
 int __init pci_legacy_init(void)
@@ -49,6 +35,28 @@ int __init pci_legacy_init(void)
 
        return 0;
 }
+EXPORT_SYMBOL_GPL(pci_legacy_init);
+
+void pcibios_scan_specific_bus(int busn)
+{
+       int devfn;
+       long node;
+       u32 l;
+
+       if (pci_find_bus(0, busn))
+               return;
+
+       node = get_mp_bus_to_node(busn);
+       for (devfn = 0; devfn < 256; devfn += 8) {
+               if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) &&
+                   l != 0x0000 && l != 0xffff) {
+                       DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l);
+                       printk(KERN_INFO "PCI: Discovered peer bus %02x\n", busn);
+                       pci_scan_bus_on_node(busn, &pci_root_ops, node);
+                       return;
+               }
+       }
+}
 
 int __init pci_subsys_init(void)
 {