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-rw-r--r--arch/i386/pci/mmconfig-shared.c12
-rw-r--r--arch/i386/pci/mmconfig.c6
-rw-r--r--arch/i386/pci/pci.h2
-rw-r--r--arch/x86_64/pci/mmconfig.c6
4 files changed, 21 insertions, 5 deletions
diff --git a/arch/i386/pci/mmconfig-shared.c b/arch/i386/pci/mmconfig-shared.c
index 4ea0852487a..473db625701 100644
--- a/arch/i386/pci/mmconfig-shared.c
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -43,12 +43,14 @@ static void __init unreachable_devices(void)
if (val1 == 0xffffffff)
continue;
- raw_pci_ops->read(0, bus, devfn, 0, 4, &val2);
- if (val1 != val2) {
- set_bit(i + 32 * bus, pci_mmcfg_fallback_slots);
- printk(KERN_NOTICE "PCI: No mmconfig possible"
- " on device %02x:%02x\n", bus, i);
+ if (pci_mmcfg_arch_reachable(0, bus, devfn)) {
+ raw_pci_ops->read(0, bus, devfn, 0, 4, &val2);
+ if (val1 == val2)
+ continue;
}
+ set_bit(i + 32 * bus, pci_mmcfg_fallback_slots);
+ printk(KERN_NOTICE "PCI: No mmconfig possible on device"
+ " %02x:%02x\n", bus, i);
}
}
}
diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index 11be089efd7..bb1afd9e589 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -136,6 +136,12 @@ static struct pci_raw_ops pci_mmcfg = {
.write = pci_mmcfg_write,
};
+int __init pci_mmcfg_arch_reachable(unsigned int seg, unsigned int bus,
+ unsigned int devfn)
+{
+ return get_base_addr(seg, bus, devfn) != 0;
+}
+
int __init pci_mmcfg_arch_init(void)
{
printk(KERN_INFO "PCI: Using MMCONFIG\n");
diff --git a/arch/i386/pci/pci.h b/arch/i386/pci/pci.h
index 2ce3d44b09d..e58bae2076a 100644
--- a/arch/i386/pci/pci.h
+++ b/arch/i386/pci/pci.h
@@ -101,4 +101,6 @@ extern void pcibios_sort(void);
#define PCI_MMCFG_MAX_CHECK_BUS 16
extern DECLARE_BITMAP(pci_mmcfg_fallback_slots, 32*PCI_MMCFG_MAX_CHECK_BUS);
+extern int __init pci_mmcfg_arch_reachable(unsigned int seg, unsigned int bus,
+ unsigned int devfn);
extern int __init pci_mmcfg_arch_init(void);
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index 918fc5b95a0..65d82736987 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -126,6 +126,12 @@ static void __iomem * __init mcfg_ioremap(struct acpi_mcfg_allocation *cfg)
return addr;
}
+int __init pci_mmcfg_arch_reachable(unsigned int seg, unsigned int bus,
+ unsigned int devfn)
+{
+ return pci_dev_base(seg, bus, devfn) != NULL;
+}
+
int __init pci_mmcfg_arch_init(void)
{
int i;