1 files changed, 47 insertions, 0 deletions

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 88b5416cf009..a6d27797ef47 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -90,6 +90,50 @@ static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
                 rom_r->start = rom_r->end = rom_r->flags = 0;
 }
 
+static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d)
+{
+        pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
+        printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
+        return 0;
+}
+
+static struct dmi_system_id can_skip_pciprobe_dmi_table[] __devinitdata = {
+/*
+ * Systems where PCI IO resource ISA alignment can be skipped
+ * when the ISA enable bit in the bridge control is not set
+ */
+        {
+                .callback = can_skip_ioresource_align,
+                .ident = "IBM System x3800",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
+                },
+        },
+        {
+                .callback = can_skip_ioresource_align,
+                .ident = "IBM System x3850",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
+                },
+        },
+        {
+                .callback = can_skip_ioresource_align,
+                .ident = "IBM System x3950",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
+                },
+        },
+        {}
+};
+
+void __init dmi_check_skip_isa_align(void)
+{
+        dmi_check_system(can_skip_pciprobe_dmi_table);
+}
+
 /*
  *  Called after each bus is probed, but before its children
  *  are examined.
@@ -462,6 +506,9 @@ char * __devinit  pcibios_setup(char *str)
         } else if (!strcmp(str, "routeirq")) {
                 pci_routeirq = 1;
                 return NULL;
+        } else if (!strcmp(str, "skip_isa_align")) {
+                pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
+                return NULL;
         }
         return str;
 }