[PATCH] mmconfig: Share parts of mmconfig code between i386 and x86-64

i386 and x86-64 pci mmconfig code have a lot in common.  So share what's
shareable between the two.

Signed-off-by: Olivier Galibert <galibert@pobox.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>

2 files changed, 14 insertions, 65 deletions

diff --git a/arch/x86_64/pci/Makefile b/arch/x86_64/pci/Makefile
index 149aba05a5b8..c9eddc8859c0 100644
--- a/arch/x86_64/pci/Makefile
+++ b/arch/x86_64/pci/Makefile
@@ -11,7 +11,7 @@ obj-y		+= fixup.o init.o
 obj-$(CONFIG_ACPI)      += acpi.o
 obj-y                   += legacy.o irq.o common.o early.o
 # mmconfig has a 64bit special
-obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o direct.o
+obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o direct.o mmconfig-shared.o
 
 obj-$(CONFIG_NUMA)      += k8-bus.o
 
@@ -24,3 +24,4 @@ fixup-y  += ../../i386/pci/fixup.o
 i386-y  += ../../i386/pci/i386.o
 init-y += ../../i386/pci/init.o
 early-y += ../../i386/pci/early.o
+mmconfig-shared-y += ../../i386/pci/mmconfig-shared.o
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index faabb6e87f12..0847735bb31e 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -19,9 +19,7 @@
 
 /* Verify the first 16 busses. We assume that systems with more busses
    get MCFG right. */
-#define MAX_CHECK_BUS 16
-
-static DECLARE_BITMAP(fallback_slots, 32*MAX_CHECK_BUS);
+#define PCI_MMCFG_MAX_CHECK_BUS 16
 
 /* Static virtual mapping of the MMCONFIG aperture */
 struct mmcfg_virt {
@@ -63,8 +61,8 @@ static char __iomem *get_virt(unsigned int seg, unsigned bus)
 static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn)
 {
         char __iomem *addr;
-        if (seg == 0 && bus < MAX_CHECK_BUS &&
-                test_bit(32*bus + PCI_SLOT(devfn), fallback_slots))
+        if (seg == 0 && bus < PCI_MMCFG_MAX_CHECK_BUS &&
+                test_bit(32*bus + PCI_SLOT(devfn), pci_mmcfg_fallback_slots))
                 return NULL;
         addr = get_virt(seg, bus);
         if (!addr)
@@ -135,63 +133,16 @@ static struct pci_raw_ops pci_mmcfg = {
         .write =        pci_mmcfg_write,
 };
 
-/* K8 systems have some devices (typically in the builtin northbridge)
-   that are only accessible using type1
-   Normally this can be expressed in the MCFG by not listing them
-   and assigning suitable _SEGs, but this isn't implemented in some BIOS.
-   Instead try to discover all devices on bus 0 that are unreachable using MM
-   and fallback for them. */
-static __init void unreachable_devices(void)
-{
-        int i, k;
-        /* Use the max bus number from ACPI here? */
-        for (k = 0; k < MAX_CHECK_BUS; k++) {
-                for (i = 0; i < 32; i++) {
-                        u32 val1;
-                        char __iomem *addr;
-
-                        pci_conf1_read(0, k, PCI_DEVFN(i,0), 0, 4, &val1);
-                        if (val1 == 0xffffffff)
-                                continue;
-                        addr = pci_dev_base(0, k, PCI_DEVFN(i, 0));
-                        if (addr == NULL|| readl(addr) != val1) {
-                                set_bit(i + 32*k, fallback_slots);
-                                printk(KERN_NOTICE "PCI: No mmconfig possible"
-                                       " on device %02x:%02x\n", k, i);
-                        }
-                }
-        }
-}
-
-void __init pci_mmcfg_init(int type)
+int __init pci_mmcfg_arch_init(void)
 {
         int i;
-
-        if ((pci_probe & PCI_PROBE_MMCONF) == 0)
-                return;
-
-        acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
-        if ((pci_mmcfg_config_num == 0) ||
-            (pci_mmcfg_config == NULL) ||
-            (pci_mmcfg_config[0].address == 0))
-                return;
-
-        /* Only do this check when type 1 works. If it doesn't work
-           assume we run on a Mac and always use MCFG */
-        if (type == 1 && !e820_all_mapped(pci_mmcfg_config[0].address,
-                        pci_mmcfg_config[0].address + MMCONFIG_APER_MIN,
-                        E820_RESERVED)) {
-                printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %lx is not E820-reserved\n",
-                                (unsigned long)pci_mmcfg_config[0].address);
-                printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
-                return;
-        }
-
-        pci_mmcfg_virt = kmalloc(sizeof(*pci_mmcfg_virt) * pci_mmcfg_config_num, GFP_KERNEL);
+        pci_mmcfg_virt = kmalloc(sizeof(*pci_mmcfg_virt) *
+                                 pci_mmcfg_config_num, GFP_KERNEL);
         if (pci_mmcfg_virt == NULL) {
                 printk(KERN_ERR "PCI: Can not allocate memory for mmconfig structures\n");
-                return;
+                return 0;
         }
+
         for (i = 0; i < pci_mmcfg_config_num; ++i) {
                 pci_mmcfg_virt[i].cfg = &pci_mmcfg_config[i];
                 pci_mmcfg_virt[i].virt = ioremap_nocache(pci_mmcfg_config[i].address,
@@ -200,14 +151,11 @@ void __init pci_mmcfg_init(int type)
                         printk(KERN_ERR "PCI: Cannot map mmconfig aperture for "
                                         "segment %d\n",
                                 pci_mmcfg_config[i].pci_segment);
-                        return;
+                        return 0;
                 }
-                printk(KERN_INFO "PCI: Using MMCONFIG at %lx\n",
-                        (unsigned long)pci_mmcfg_config[i].address);
+                printk(KERN_INFO "PCI: Using MMCONFIG at %Lx\n",
+                                pci_mmcfg_config[i].address);
         }
-
-        unreachable_devices();
-
         raw_pci_ops = &pci_mmcfg;
-        pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
+        return 1;
 }