x86/PCI: MMCONFIG: add lookup function

This patch factors out the search for an MMCONFIG region, which was
previously implemented in both mmconfig_32 and mmconfig_64.  No functional
change.

Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 4 insertions, 19 deletions

diff --git a/arch/x86/pci/mmconfig_64.c b/arch/x86/pci/mmconfig_64.c
index cfa6cdb6d262..e783841bd1d7 100644
--- a/arch/x86/pci/mmconfig_64.c
+++ b/arch/x86/pci/mmconfig_64.c
@@ -14,28 +14,13 @@
 
 #define PREFIX "PCI: "
 
-static char __iomem *get_virt(unsigned int seg, unsigned bus)
-{
-        struct pci_mmcfg_region *cfg;
-
-        list_for_each_entry(cfg, &pci_mmcfg_list, list)
-                if (cfg->segment == seg &&
-                    (cfg->start_bus <= bus) &&
-                    (cfg->end_bus >= bus))
-                        return cfg->virt;
-
-        /* Fall back to type 0 */
-        return NULL;
-}
-
 static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn)
 {
-        char __iomem *addr;
+        struct pci_mmcfg_region *cfg = pci_mmconfig_lookup(seg, bus);
 
-        addr = get_virt(seg, bus);
-        if (!addr)
-                return NULL;
-        return addr + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12));
+        if (cfg && cfg->virt)
+                return cfg->virt + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12));
+        return NULL;
 }
 
 static int pci_mmcfg_read(unsigned int seg, unsigned int bus,