PCI: use ACPI to verify extended config space on x86

@@ -5,6 +5,107 @@
 #include <asm/numa.h>
 #include "pci.h"
 
+static int __init is_motherboard_resource(acpi_handle handle)
+{
+       acpi_status status;
+       struct acpi_device_info *info;
+       struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+       int i;
+
+       status = acpi_get_object_info(handle, &buffer);
+       if (ACPI_FAILURE(status))
+	       return 0;
+       info = buffer.pointer;
+       if ((info->valid & ACPI_VALID_HID) &&
+		       (!strcmp(ACPI_MB_HID1, info->hardware_id.value) ||
+			!strcmp(ACPI_MB_HID2, info->hardware_id.value))) {
+	       kfree(buffer.pointer);
+	       return 1;
+       }
+       if (info->valid & ACPI_VALID_CID) {
+	       for (i=0; i < info->compatibility_id.count; i++) {
+		       if (!strcmp(ACPI_MB_HID1,
+				info->compatibility_id.id[i].value) ||
+				!strcmp(ACPI_MB_HID2,
+					info->compatibility_id.id[i].value)) {
+                                        kfree(buffer.pointer);
+                                        return 1;
+			}
+		}
+	}
+	kfree(buffer.pointer);
+        return 0;
+}
+
+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;
+
+		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_status status = AE_OK;
+
+	/* Stop namespace scanning if we've already verified MMCONFIG */
+	if (mcfg_res->flags)
+		return AE_CTRL_TERMINATE;
+
+	if (is_motherboard_resource(handle)) {
+		status = acpi_walk_resources(handle, METHOD_NAME__CRS,
+				check_mcfg_resource, context);
+	}
+	return status;
+}
+
+int __init is_acpi_reserved(unsigned long start, unsigned long end)
+{
+	struct resource mcfg_res;
+
+	mcfg_res.start = start;
+	mcfg_res.end = end;
+	mcfg_res.flags = 0;
+
+	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+			ACPI_UINT32_MAX, find_mboard_resource,
+			(void *)&mcfg_res, NULL);
+	return mcfg_res.flags;
+}
+
 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
 {
 	struct pci_bus *bus;

@@ -201,10 +201,15 @@ void __init pci_mmcfg_init(void)
 	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",
+		if (!is_acpi_reserved(pci_mmcfg_config[0].base_address,
+					pci_mmcfg_config[0].base_address +
+					MMCONFIG_APER_MIN)) {
+			printk(KERN_ERR
+				"PCI: BIOS Bug: MCFG area at %x not reserved\n",
 				pci_mmcfg_config[0].base_address);
-		printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
-		return;
+			printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
+			return;
+		}
 	}
 
 	printk(KERN_INFO "PCI: Using MMCONFIG\n");

@@ -32,9 +32,6 @@
 #define _COMPONENT		ACPI_SYSTEM_COMPONENT
 ACPI_MODULE_NAME("acpi_motherboard")
 
-/* Dell use PNP0C01 instead of PNP0C02 */
-#define ACPI_MB_HID1			"PNP0C01"
-#define ACPI_MB_HID2			"PNP0C02"
 /**
  * Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
  * Doesn't care about the failure of 'request_region', since other may reserve

@@ -696,6 +696,10 @@ struct acpi_parse_state {
 
 #define PCI_ROOT_HID_STRING             "PNP0A03"
 #define PCI_EXPRESS_ROOT_HID_STRING     "PNP0A08"
+/* Dell use PNP0C01 instead of PNP0C02 */
+#define ACPI_MB_HID1			"PNP0C01"
+#define ACPI_MB_HID2			"PNP0C02"
+
 
 struct acpi_bit_register_info {
 	u8 parent_register;

@@ -76,6 +76,10 @@ int acpi_pci_bind_root(struct acpi_devic
 struct pci_bus *pci_acpi_scan_root(struct acpi_device *device, int domain,
 				   int bus);
 
+/* Arch-defined function to check if region is acpi-reserved */
+
+extern int is_acpi_reserved(unsigned long start, unsigned long end);
+
 /* --------------------------------------------------------------------------
                                   Power Resource
    -------------------------------------------------------------------------- */

@@ -180,10 +180,15 @@ void __init pci_mmcfg_init(void)
 	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",
+		if (!is_acpi_reserved(pci_mmcfg_config[0].base_address,
+					pci_mmcfg_config[0].base_address +
+					MMCONFIG_APER_MIN)) {
+			printk(KERN_ERR
+				"PCI: BIOS Bug: MCFG area at %x is not reserved\n",
 				pci_mmcfg_config[0].base_address);
-		printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
-		return;
+			printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
+			return;
+		}
 	}
 
 	/* RED-PEN i386 doesn't do _nocache right now */