4 files changed, 43 insertions, 31 deletions

diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 345ffb7d904d..f1682206d304 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -956,6 +956,38 @@ efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg)
         return 0;
 }
 
+ /*
+  * This function checks if the entire range <start,end> is mapped with type.
+  *
+  * Note: this function only works correct if the e820 table is sorted and
+  * not-overlapping, which is the case
+  */
+int __init
+e820_all_mapped(unsigned long s, unsigned long e, unsigned type)
+{
+        u64 start = s;
+        u64 end = e;
+        int i;
+        for (i = 0; i < e820.nr_map; i++) {
+                struct e820entry *ei = &e820.map[i];
+                if (type && ei->type != type)
+                        continue;
+                /* is the region (part) in overlap with the current region ?*/
+                if (ei->addr >= end || ei->addr + ei->size <= start)
+                        continue;
+                /* if the region is at the beginning of <start,end> we move
+                 * start to the end of the region since it's ok until there
+                 */
+                if (ei->addr <= start)
+                        start = ei->addr + ei->size;
+                /* if start is now at or beyond end, we're done, full
+                 * coverage */
+                if (start >= end)
+                        return 1; /* we're done */
+        }
+        return 0;
+}
+
 /*
  * Find the highest page frame number we have available
  */
diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c
index 1220dd828ce3..0a362e3aeac5 100644
--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -237,11 +237,6 @@ char * __devinit  pcibios_setup(char *str)
                 pci_probe &= ~PCI_PROBE_MMCONF;
                 return NULL;
         }
-        /* override DMI blacklist */
-        else if (!strcmp(str, "mmconf")) {
-                pci_probe |= PCI_PROBE_MMCONF_FORCE;
-                return NULL;
-        }
 #endif
         else if (!strcmp(str, "noacpi")) {
                 acpi_noirq_set();
diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index ef5a2faa7d82..972180f738d9 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -12,7 +12,6 @@
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/acpi.h>
-#include <linux/dmi.h>
 #include <asm/e820.h>
 #include "pci.h"
 
@@ -188,31 +187,9 @@ static __init void unreachable_devices(void)
         }
 }
 
-static int disable_mcfg(struct dmi_system_id *d)
-{
-        printk("PCI: %s detected. Disabling MCFG.\n", d->ident);
-        pci_probe &= ~PCI_PROBE_MMCONF;
-        return 0;
-}
-
-static struct dmi_system_id __initdata dmi_bad_mcfg[] = {
-        /* Has broken MCFG table that makes the system hang when used */
-        {
-         .callback = disable_mcfg,
-         .ident = "Intel D3C5105 SDV",
-         .matches = {
-                     DMI_MATCH(DMI_BIOS_VENDOR, "Intel"),
-                     DMI_MATCH(DMI_BOARD_NAME, "D26928"),
-                     },
-         },
-         {}
-};
-
 void __init pci_mmcfg_init(void)
 {
-        dmi_check_system(dmi_bad_mcfg);
-
-        if ((pci_probe & (PCI_PROBE_MMCONF_FORCE|PCI_PROBE_MMCONF)) == 0)
+        if ((pci_probe & PCI_PROBE_MMCONF) == 0)
                 return;
 
         acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
@@ -221,6 +198,15 @@ void __init pci_mmcfg_init(void)
             (pci_mmcfg_config[0].base_address == 0))
                 return;
 
+        if (!e820_all_mapped(pci_mmcfg_config[0].base_address,
+                        pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN,
+                        E820_RESERVED)) {
+                printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n",
+                                pci_mmcfg_config[0].base_address);
+                printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
+                return;
+        }
+
         printk(KERN_INFO "PCI: Using MMCONFIG\n");
         raw_pci_ops = &pci_mmcfg;
         pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
diff --git a/arch/i386/pci/pci.h b/arch/i386/pci/pci.h
index 49a849b3a241..bf4e79335388 100644
--- a/arch/i386/pci/pci.h
+++ b/arch/i386/pci/pci.h
@@ -16,8 +16,7 @@
 #define PCI_PROBE_CONF1         0x0002
 #define PCI_PROBE_CONF2         0x0004
 #define PCI_PROBE_MMCONF        0x0008
-#define PCI_PROBE_MMCONF_FORCE  0x0010
-#define PCI_PROBE_MASK          0x00ff
+#define PCI_PROBE_MASK          0x000f
 
 #define PCI_NO_SORT             0x0100
 #define PCI_BIOS_SORT           0x0200