+static acpi_status __init check_mcfg_resource(struct acpi_resource *res,
+ void *data)
+{
+ struct resource *mcfg_res = data;
+ struct acpi_resource_address64 address;
+ acpi_status status;
+
+ if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
+ struct acpi_resource_fixed_memory32 *fixmem32 =
+ &res->data.fixed_memory32;
+ if (!fixmem32)
+ return AE_OK;
+ if ((mcfg_res->start >= fixmem32->address) &&
+ (mcfg_res->end < (fixmem32->address +
+ fixmem32->address_length))) {
+ mcfg_res->flags = 1;
+ return AE_CTRL_TERMINATE;
+ }
+ }
+ if ((res->type != ACPI_RESOURCE_TYPE_ADDRESS32) &&
+ (res->type != ACPI_RESOURCE_TYPE_ADDRESS64))
+ return AE_OK;
+
+ status = acpi_resource_to_address64(res, &address);
+ if (ACPI_FAILURE(status) ||
+ (address.address_length <= 0) ||
+ (address.resource_type != ACPI_MEMORY_RANGE))
+ return AE_OK;
+
+ if ((mcfg_res->start >= address.minimum) &&
+ (mcfg_res->end < (address.minimum + address.address_length))) {
+ mcfg_res->flags = 1;
+ return AE_CTRL_TERMINATE;
+ }
+ return AE_OK;
+}
+
+static acpi_status __init find_mboard_resource(acpi_handle handle, u32 lvl,
+ void *context, void **rv)
+{
+ struct resource *mcfg_res = context;
+
+ acpi_walk_resources(handle, METHOD_NAME__CRS,
+ check_mcfg_resource, context);
+
+ if (mcfg_res->flags)
+ return AE_CTRL_TERMINATE;
+
+ return AE_OK;
+}
+
+static int __init is_acpi_reserved(u64 start, u64 end, unsigned not_used)
+{
+ struct resource mcfg_res;
+
+ mcfg_res.start = start;
+ mcfg_res.end = end;
+ mcfg_res.flags = 0;
+
+ acpi_get_devices("PNP0C01", find_mboard_resource, &mcfg_res, NULL);
+
+ if (!mcfg_res.flags)
+ acpi_get_devices("PNP0C02", find_mboard_resource, &mcfg_res,
+ NULL);
+
+ return mcfg_res.flags;
+}
+
+typedef int (*check_reserved_t)(u64 start, u64 end, unsigned type);
+
+static int __init is_mmconf_reserved(check_reserved_t is_reserved,
+ u64 addr, u64 size, int i,
+ typeof(pci_mmcfg_config[0]) *cfg, int with_e820)
+{
+ u64 old_size = size;
+ int valid = 0;
+
+ while (!is_reserved(addr, addr + size - 1, E820_RESERVED)) {
+ size >>= 1;
+ if (size < (16UL<<20))
+ break;
+ }
+
+ if (size >= (16UL<<20) || size == old_size) {
+ printk(KERN_NOTICE
+ "PCI: MCFG area at %Lx reserved in %s\n",
+ addr, with_e820?"E820":"ACPI motherboard resources");
+ valid = 1;
+
+ if (old_size != size) {
+ /* update end_bus_number */
+ cfg->end_bus_number = cfg->start_bus_number + ((size>>20) - 1);
+ printk(KERN_NOTICE "PCI: updated MCFG configuration %d: base %lx "
+ "segment %hu buses %u - %u\n",
+ i, (unsigned long)cfg->address, cfg->pci_segment,
+ (unsigned int)cfg->start_bus_number,
+ (unsigned int)cfg->end_bus_number);
+ }
+ }
+
+ return valid;
+}
+
+static void __init pci_mmcfg_reject_broken(int early)