arch/x86/pci/mmconfig-shared.c - fp2-dev/kernel/msm - Gitiles

 /*
  * mmconfig-shared.c - Low-level direct PCI config space access via
  *                     MMCONFIG - common code between i386 and x86-64.
  *
  * This code does:
  * - known chipset handling
  * - ACPI decoding and validation
  *
  * Per-architecture code takes care of the mappings and accesses
  * themselves.
  */

 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/acpi.h>
 #include <linux/bitmap.h>
 #include <asm/e820.h>

 #include "pci.h"

 /* aperture is up to 256MB but BIOS may reserve less */
 #define MMCONFIG_APER_MIN	(2 * 1024*1024)
 #define MMCONFIG_APER_MAX	(256 * 1024*1024)

 /* Indicate if the mmcfg resources have been placed into the resource table. */
 static int __initdata pci_mmcfg_resources_inserted;

 static const char __init *pci_mmcfg_e7520(void)
 {
 	u32 win;
 	raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0xce, 2, &win);

 	win = win & 0xf000;
 	if(win == 0x0000 || win == 0xf000)
 		pci_mmcfg_config_num = 0;
 	else {
 		pci_mmcfg_config_num = 1;
 		pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
 		if (!pci_mmcfg_config)
 			return NULL;
 		pci_mmcfg_config[0].address = win << 16;
 		pci_mmcfg_config[0].pci_segment = 0;
 		pci_mmcfg_config[0].start_bus_number = 0;
 		pci_mmcfg_config[0].end_bus_number = 255;
 	}

 	return "Intel Corporation E7520 Memory Controller Hub";
 }

 static const char __init *pci_mmcfg_intel_945(void)
 {
 	u32 pciexbar, mask = 0, len = 0;

 	pci_mmcfg_config_num = 1;

 	raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0x48, 4, &pciexbar);

 	/* Enable bit */
 	if (!(pciexbar & 1))
 		pci_mmcfg_config_num = 0;

 	/* Size bits */
 	switch ((pciexbar >> 1) & 3) {
 	case 0:
 		mask = 0xf0000000U;
 		len  = 0x10000000U;
 		break;
 	case 1:
 		mask = 0xf8000000U;
 		len  = 0x08000000U;
 		break;
 	case 2:
 		mask = 0xfc000000U;
 		len  = 0x04000000U;
 		break;
 	default:
 		pci_mmcfg_config_num = 0;
 	}

 	/* Errata #2, things break when not aligned on a 256Mb boundary */
 	/* Can only happen in 64M/128M mode */

 	if ((pciexbar & mask) & 0x0fffffffU)
 		pci_mmcfg_config_num = 0;

 	/* Don't hit the APIC registers and their friends */
 	if ((pciexbar & mask) >= 0xf0000000U)
 		pci_mmcfg_config_num = 0;

 	if (pci_mmcfg_config_num) {
 		pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
 		if (!pci_mmcfg_config)
 			return NULL;
 		pci_mmcfg_config[0].address = pciexbar & mask;
 		pci_mmcfg_config[0].pci_segment = 0;
 		pci_mmcfg_config[0].start_bus_number = 0;
 		pci_mmcfg_config[0].end_bus_number = (len >> 20) - 1;
 	}

 	return "Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub";
 }

 static const char __init *pci_mmcfg_amd_fam10h(void)
 {
 	u32 low, high, address;
 	u64 base, msr;
 	int i;
 	unsigned segnbits = 0, busnbits;

 	if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF))
 		return NULL;

 	address = MSR_FAM10H_MMIO_CONF_BASE;
 	if (rdmsr_safe(address, &low, &high))
 		return NULL;

 	msr = high;
 	msr <<= 32;
 	msr |= low;

 	/* mmconfig is not enable */
 	if (!(msr & FAM10H_MMIO_CONF_ENABLE))
 		return NULL;

 	base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);

 	busnbits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
 			 FAM10H_MMIO_CONF_BUSRANGE_MASK;

 	/*
 	 * only handle bus 0 ?
 	 * need to skip it
 	 */
 	if (!busnbits)
 		return NULL;

 	if (busnbits > 8) {
 		segnbits = busnbits - 8;
 		busnbits = 8;
 	}

 	pci_mmcfg_config_num = (1 << segnbits);
 	pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]) *
 				   pci_mmcfg_config_num, GFP_KERNEL);
 	if (!pci_mmcfg_config)
 		return NULL;

 	for (i = 0; i < (1 << segnbits); i++) {
 		pci_mmcfg_config[i].address = base + (1<<28) * i;
 		pci_mmcfg_config[i].pci_segment = i;
 		pci_mmcfg_config[i].start_bus_number = 0;
 		pci_mmcfg_config[i].end_bus_number = (1 << busnbits) - 1;
 	}

 	return "AMD Family 10h NB";
 }

 struct pci_mmcfg_hostbridge_probe {
 	u32 bus;
 	u32 devfn;
 	u32 vendor;
 	u32 device;
 	const char *(*probe)(void);
 };

 static struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] __initdata = {
 	{ 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL,
 	  PCI_DEVICE_ID_INTEL_E7520_MCH, pci_mmcfg_e7520 },
 	{ 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL,
 	  PCI_DEVICE_ID_INTEL_82945G_HB, pci_mmcfg_intel_945 },
 	{ 0, PCI_DEVFN(0x18, 0), PCI_VENDOR_ID_AMD,
 	  0x1200, pci_mmcfg_amd_fam10h },
 	{ 0xff, PCI_DEVFN(0, 0), PCI_VENDOR_ID_AMD,
 	  0x1200, pci_mmcfg_amd_fam10h },
 };

 static int __init pci_mmcfg_check_hostbridge(void)
 {
 	u32 l;
 	u32 bus, devfn;
 	u16 vendor, device;
 	int i;
 	const char *name;

 	if (!raw_pci_ops)
 		return 0;

 	pci_mmcfg_config_num = 0;
 	pci_mmcfg_config = NULL;
 	name = NULL;

 	for (i = 0; !name && i < ARRAY_SIZE(pci_mmcfg_probes); i++) {
 		bus =  pci_mmcfg_probes[i].bus;
 		devfn = pci_mmcfg_probes[i].devfn;
 		raw_pci_ops->read(0, bus, devfn, 0, 4, &l);
 		vendor = l & 0xffff;
 		device = (l >> 16) & 0xffff;

 		if (pci_mmcfg_probes[i].vendor == vendor &&
 		    pci_mmcfg_probes[i].device == device)
 			name = pci_mmcfg_probes[i].probe();
 	}

 	if (name) {
 		printk(KERN_INFO "PCI: Found %s %s MMCONFIG support.\n",
 		       name, pci_mmcfg_config_num ? "with" : "without");
 	}

 	return name != NULL;
 }

 static void __init pci_mmcfg_insert_resources(unsigned long resource_flags)
 {
 #define PCI_MMCFG_RESOURCE_NAME_LEN 19
 	int i;
 	struct resource *res;
 	char *names;
 	unsigned num_buses;

 	res = kcalloc(PCI_MMCFG_RESOURCE_NAME_LEN + sizeof(*res),
 			pci_mmcfg_config_num, GFP_KERNEL);
 	if (!res) {
 		printk(KERN_ERR "PCI: Unable to allocate MMCONFIG resources\n");
 		return;
 	}

 	names = (void *)&res[pci_mmcfg_config_num];
 	for (i = 0; i < pci_mmcfg_config_num; i++, res++) {
 		struct acpi_mcfg_allocation *cfg = &pci_mmcfg_config[i];
 		num_buses = cfg->end_bus_number - cfg->start_bus_number + 1;
 		res->name = names;
 		snprintf(names, PCI_MMCFG_RESOURCE_NAME_LEN, "PCI MMCONFIG %u",
 			 cfg->pci_segment);
 		res->start = cfg->address;
 		res->end = res->start + (num_buses << 20) - 1;
 		res->flags = IORESOURCE_MEM | resource_flags;
 		insert_resource(&iomem_resource, res);
 		names += PCI_MMCFG_RESOURCE_NAME_LEN;
 	}

 	/* Mark that the resources have been inserted. */
 	pci_mmcfg_resources_inserted = 1;
 }

 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(unsigned long start, unsigned long end)
 {
 	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;
 }

 static void __init pci_mmcfg_reject_broken(int early)
 {
 	typeof(pci_mmcfg_config[0]) *cfg;
 	int i;

 	if ((pci_mmcfg_config_num == 0) ||
 	    (pci_mmcfg_config == NULL) ||
 	    (pci_mmcfg_config[0].address == 0))
 		return;

 	cfg = &pci_mmcfg_config[0];

 	for (i = 0; i < pci_mmcfg_config_num; i++) {
 		int valid = 0;
 		u32 size = (cfg->end_bus_number + 1) << 20;
 		cfg = &pci_mmcfg_config[i];
 		printk(KERN_NOTICE "PCI: 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);

 		if (!early &&
 		    is_acpi_reserved(cfg->address, cfg->address + size - 1)) {
 			printk(KERN_NOTICE "PCI: MCFG area at %Lx reserved "
 			       "in ACPI motherboard resources\n",
 			       cfg->address);
 			valid = 1;
 		}

 		if (valid)
 			continue;

 		if (!early)
 			printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %Lx is not"
 			       " reserved in ACPI motherboard resources\n",
 			       cfg->address);
 		/* Don't try to do this check unless configuration
 		   type 1 is available. how about type 2 ?*/
 		if (raw_pci_ops && e820_all_mapped(cfg->address,
 						  cfg->address + size - 1,
 						  E820_RESERVED)) {
 			printk(KERN_NOTICE
 			       "PCI: MCFG area at %Lx reserved in E820\n",
 			       cfg->address);
 			valid = 1;
 		}

 		if (!valid)
 			goto reject;
 	}

 	return;

 reject:
 	printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
 	pci_mmcfg_arch_free();
 	kfree(pci_mmcfg_config);
 	pci_mmcfg_config = NULL;
 	pci_mmcfg_config_num = 0;
 }

 static int __initdata known_bridge;

 void __init __pci_mmcfg_init(int early)
 {
 	/* MMCONFIG disabled */
 	if ((pci_probe & PCI_PROBE_MMCONF) == 0)
 		return;

 	/* MMCONFIG already enabled */
 	if (!early && !(pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF))
 		return;

 	/* for late to exit */
 	if (known_bridge)
 		return;

 	if (early) {
 		if (pci_mmcfg_check_hostbridge())
 			known_bridge = 1;
 	}

 	if (!known_bridge) {
 		acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
 		pci_mmcfg_reject_broken(early);
 	}

 	if ((pci_mmcfg_config_num == 0) ||
 	    (pci_mmcfg_config == NULL) ||
 	    (pci_mmcfg_config[0].address == 0))
 		return;

 	if (pci_mmcfg_arch_init()) {
 		if (known_bridge)
 			pci_mmcfg_insert_resources(IORESOURCE_BUSY);
 		pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
 	} else {
 		/*
 		 * Signal not to attempt to insert mmcfg resources because
 		 * the architecture mmcfg setup could not initialize.
 		 */
 		pci_mmcfg_resources_inserted = 1;
 	}
 }

 void __init pci_mmcfg_early_init(void)
 {
 	__pci_mmcfg_init(1);
 }

 void __init pci_mmcfg_late_init(void)
 {
 	__pci_mmcfg_init(0);
 }

 static int __init pci_mmcfg_late_insert_resources(void)
 {
 	/*
 	 * If resources are already inserted or we are not using MMCONFIG,
 	 * don't insert the resources.
 	 */
 	if ((pci_mmcfg_resources_inserted == 1) ||
 	    (pci_probe & PCI_PROBE_MMCONF) == 0 ||
 	    (pci_mmcfg_config_num == 0) ||
 	    (pci_mmcfg_config == NULL) ||
 	    (pci_mmcfg_config[0].address == 0))
 		return 1;

 	/*
 	 * Attempt to insert the mmcfg resources but not with the busy flag
 	 * marked so it won't cause request errors when __request_region is
 	 * called.
 	 */
 	pci_mmcfg_insert_resources(0);

 	return 0;
 }

 /*
  * Perform MMCONFIG resource insertion after PCI initialization to allow for
  * misprogrammed MCFG tables that state larger sizes but actually conflict
  * with other system resources.
  */
 late_initcall(pci_mmcfg_late_insert_resources);
	/*
	* mmconfig-shared.c - Low-level direct PCI config space access via
	* MMCONFIG - common code between i386 and x86-64.
	*
	* This code does:
	* - known chipset handling
	* - ACPI decoding and validation
	*
	* Per-architecture code takes care of the mappings and accesses
	* themselves.
	*/

	#include <linux/pci.h>
	#include <linux/init.h>
	#include <linux/acpi.h>
	#include <linux/bitmap.h>
	#include <asm/e820.h>

	#include "pci.h"

	/* aperture is up to 256MB but BIOS may reserve less */
	#define MMCONFIG_APER_MIN (2 * 1024*1024)
	#define MMCONFIG_APER_MAX (256 * 1024*1024)

	/* Indicate if the mmcfg resources have been placed into the resource table. */
	static int __initdata pci_mmcfg_resources_inserted;

	static const char __init *pci_mmcfg_e7520(void)
	{
	u32 win;
	raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0xce, 2, &win);

	win = win & 0xf000;
	if(win == 0x0000 \|\| win == 0xf000)
	pci_mmcfg_config_num = 0;
	else {
	pci_mmcfg_config_num = 1;
	pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
	if (!pci_mmcfg_config)
	return NULL;
	pci_mmcfg_config[0].address = win << 16;
	pci_mmcfg_config[0].pci_segment = 0;
	pci_mmcfg_config[0].start_bus_number = 0;
	pci_mmcfg_config[0].end_bus_number = 255;
	}

	return "Intel Corporation E7520 Memory Controller Hub";
	}

	static const char __init *pci_mmcfg_intel_945(void)
	{
	u32 pciexbar, mask = 0, len = 0;

	pci_mmcfg_config_num = 1;

	raw_pci_ops->read(0, 0, PCI_DEVFN(0, 0), 0x48, 4, &pciexbar);

	/* Enable bit */
	if (!(pciexbar & 1))
	pci_mmcfg_config_num = 0;

	/* Size bits */
	switch ((pciexbar >> 1) & 3) {
	case 0:
	mask = 0xf0000000U;
	len = 0x10000000U;
	break;
	case 1:
	mask = 0xf8000000U;
	len = 0x08000000U;
	break;
	case 2:
	mask = 0xfc000000U;
	len = 0x04000000U;
	break;
	default:
	pci_mmcfg_config_num = 0;
	}

	/* Errata #2, things break when not aligned on a 256Mb boundary */
	/* Can only happen in 64M/128M mode */

	if ((pciexbar & mask) & 0x0fffffffU)
	pci_mmcfg_config_num = 0;

	/* Don't hit the APIC registers and their friends */
	if ((pciexbar & mask) >= 0xf0000000U)
	pci_mmcfg_config_num = 0;

	if (pci_mmcfg_config_num) {
	pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]), GFP_KERNEL);
	if (!pci_mmcfg_config)
	return NULL;
	pci_mmcfg_config[0].address = pciexbar & mask;
	pci_mmcfg_config[0].pci_segment = 0;
	pci_mmcfg_config[0].start_bus_number = 0;
	pci_mmcfg_config[0].end_bus_number = (len >> 20) - 1;
	}

	return "Intel Corporation 945G/GZ/P/PL Express Memory Controller Hub";
	}

	static const char __init *pci_mmcfg_amd_fam10h(void)
	{
	u32 low, high, address;
	u64 base, msr;
	int i;
	unsigned segnbits = 0, busnbits;

	if (!(pci_probe & PCI_CHECK_ENABLE_AMD_MMCONF))
	return NULL;

	address = MSR_FAM10H_MMIO_CONF_BASE;
	if (rdmsr_safe(address, &low, &high))
	return NULL;

	msr = high;
	msr <<= 32;
	msr \|= low;

	/* mmconfig is not enable */
	if (!(msr & FAM10H_MMIO_CONF_ENABLE))
	return NULL;

	base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);

	busnbits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
	FAM10H_MMIO_CONF_BUSRANGE_MASK;

	/*
	* only handle bus 0 ?
	* need to skip it
	*/
	if (!busnbits)
	return NULL;

	if (busnbits > 8) {
	segnbits = busnbits - 8;
	busnbits = 8;
	}

	pci_mmcfg_config_num = (1 << segnbits);
	pci_mmcfg_config = kzalloc(sizeof(pci_mmcfg_config[0]) *
	pci_mmcfg_config_num, GFP_KERNEL);
	if (!pci_mmcfg_config)
	return NULL;

	for (i = 0; i < (1 << segnbits); i++) {
	pci_mmcfg_config[i].address = base + (1<<28) * i;
	pci_mmcfg_config[i].pci_segment = i;
	pci_mmcfg_config[i].start_bus_number = 0;
	pci_mmcfg_config[i].end_bus_number = (1 << busnbits) - 1;
	}

	return "AMD Family 10h NB";
	}

	struct pci_mmcfg_hostbridge_probe {
	u32 bus;
	u32 devfn;
	u32 vendor;
	u32 device;
	const char (probe)(void);
	};

	static struct pci_mmcfg_hostbridge_probe pci_mmcfg_probes[] __initdata = {
	{ 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL,
	PCI_DEVICE_ID_INTEL_E7520_MCH, pci_mmcfg_e7520 },
	{ 0, PCI_DEVFN(0, 0), PCI_VENDOR_ID_INTEL,
	PCI_DEVICE_ID_INTEL_82945G_HB, pci_mmcfg_intel_945 },
	{ 0, PCI_DEVFN(0x18, 0), PCI_VENDOR_ID_AMD,
	0x1200, pci_mmcfg_amd_fam10h },
	{ 0xff, PCI_DEVFN(0, 0), PCI_VENDOR_ID_AMD,
	0x1200, pci_mmcfg_amd_fam10h },
	};

	static int __init pci_mmcfg_check_hostbridge(void)
	{
	u32 l;
	u32 bus, devfn;
	u16 vendor, device;
	int i;
	const char *name;

	if (!raw_pci_ops)
	return 0;

	pci_mmcfg_config_num = 0;
	pci_mmcfg_config = NULL;
	name = NULL;

	for (i = 0; !name && i < ARRAY_SIZE(pci_mmcfg_probes); i++) {
	bus = pci_mmcfg_probes[i].bus;
	devfn = pci_mmcfg_probes[i].devfn;
	raw_pci_ops->read(0, bus, devfn, 0, 4, &l);
	vendor = l & 0xffff;
	device = (l >> 16) & 0xffff;

	if (pci_mmcfg_probes[i].vendor == vendor &&
	pci_mmcfg_probes[i].device == device)
	name = pci_mmcfg_probes[i].probe();
	}

	if (name) {
	printk(KERN_INFO "PCI: Found %s %s MMCONFIG support.\n",
	name, pci_mmcfg_config_num ? "with" : "without");
	}

	return name != NULL;
	}

	static void __init pci_mmcfg_insert_resources(unsigned long resource_flags)
	{
	#define PCI_MMCFG_RESOURCE_NAME_LEN 19
	int i;
	struct resource *res;
	char *names;
	unsigned num_buses;

	res = kcalloc(PCI_MMCFG_RESOURCE_NAME_LEN + sizeof(*res),
	pci_mmcfg_config_num, GFP_KERNEL);
	if (!res) {
	printk(KERN_ERR "PCI: Unable to allocate MMCONFIG resources\n");
	return;
	}

	names = (void *)&res[pci_mmcfg_config_num];
	for (i = 0; i < pci_mmcfg_config_num; i++, res++) {
	struct acpi_mcfg_allocation *cfg = &pci_mmcfg_config[i];
	num_buses = cfg->end_bus_number - cfg->start_bus_number + 1;
	res->name = names;
	snprintf(names, PCI_MMCFG_RESOURCE_NAME_LEN, "PCI MMCONFIG %u",
	cfg->pci_segment);
	res->start = cfg->address;
	res->end = res->start + (num_buses << 20) - 1;
	res->flags = IORESOURCE_MEM \| resource_flags;
	insert_resource(&iomem_resource, res);
	names += PCI_MMCFG_RESOURCE_NAME_LEN;
	}

	/* Mark that the resources have been inserted. */
	pci_mmcfg_resources_inserted = 1;
	}

	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(unsigned long start, unsigned long end)
	{
	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;
	}

	static void __init pci_mmcfg_reject_broken(int early)
	{
	typeof(pci_mmcfg_config[0]) *cfg;
	int i;

	if ((pci_mmcfg_config_num == 0) \|\|
	(pci_mmcfg_config == NULL) \|\|
	(pci_mmcfg_config[0].address == 0))
	return;

	cfg = &pci_mmcfg_config[0];

	for (i = 0; i < pci_mmcfg_config_num; i++) {
	int valid = 0;
	u32 size = (cfg->end_bus_number + 1) << 20;
	cfg = &pci_mmcfg_config[i];
	printk(KERN_NOTICE "PCI: 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);

	if (!early &&
	is_acpi_reserved(cfg->address, cfg->address + size - 1)) {
	printk(KERN_NOTICE "PCI: MCFG area at %Lx reserved "
	"in ACPI motherboard resources\n",
	cfg->address);
	valid = 1;
	}

	if (valid)
	continue;

	if (!early)
	printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %Lx is not"
	" reserved in ACPI motherboard resources\n",
	cfg->address);
	/* Don't try to do this check unless configuration
	type 1 is available. how about type 2 ?*/
	if (raw_pci_ops && e820_all_mapped(cfg->address,
	cfg->address + size - 1,
	E820_RESERVED)) {
	printk(KERN_NOTICE
	"PCI: MCFG area at %Lx reserved in E820\n",
	cfg->address);
	valid = 1;
	}

	if (!valid)
	goto reject;
	}

	return;

	reject:
	printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
	pci_mmcfg_arch_free();
	kfree(pci_mmcfg_config);
	pci_mmcfg_config = NULL;
	pci_mmcfg_config_num = 0;
	}

	static int __initdata known_bridge;

	void __init __pci_mmcfg_init(int early)
	{
	/* MMCONFIG disabled */
	if ((pci_probe & PCI_PROBE_MMCONF) == 0)
	return;

	/* MMCONFIG already enabled */
	if (!early && !(pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF))
	return;

	/* for late to exit */
	if (known_bridge)
	return;

	if (early) {
	if (pci_mmcfg_check_hostbridge())
	known_bridge = 1;
	}

	if (!known_bridge) {
	acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
	pci_mmcfg_reject_broken(early);
	}

	if ((pci_mmcfg_config_num == 0) \|\|
	(pci_mmcfg_config == NULL) \|\|
	(pci_mmcfg_config[0].address == 0))
	return;

	if (pci_mmcfg_arch_init()) {
	if (known_bridge)
	pci_mmcfg_insert_resources(IORESOURCE_BUSY);
	pci_probe = (pci_probe & ~PCI_PROBE_MASK) \| PCI_PROBE_MMCONF;
	} else {
	/*
	* Signal not to attempt to insert mmcfg resources because
	* the architecture mmcfg setup could not initialize.
	*/
	pci_mmcfg_resources_inserted = 1;
	}
	}

	void __init pci_mmcfg_early_init(void)
	{
	__pci_mmcfg_init(1);
	}

	void __init pci_mmcfg_late_init(void)
	{
	__pci_mmcfg_init(0);
	}

	static int __init pci_mmcfg_late_insert_resources(void)
	{
	/*
	* If resources are already inserted or we are not using MMCONFIG,
	* don't insert the resources.
	*/
	if ((pci_mmcfg_resources_inserted == 1) \|\|
	(pci_probe & PCI_PROBE_MMCONF) == 0 \|\|
	(pci_mmcfg_config_num == 0) \|\|
	(pci_mmcfg_config == NULL) \|\|
	(pci_mmcfg_config[0].address == 0))
	return 1;

	/*
	* Attempt to insert the mmcfg resources but not with the busy flag
	* marked so it won't cause request errors when __request_region is
	* called.
	*/
	pci_mmcfg_insert_resources(0);

	return 0;
	}

	/*
	* Perform MMCONFIG resource insertion after PCI initialization to allow for
	* misprogrammed MCFG tables that state larger sizes but actually conflict
	* with other system resources.
	*/
	late_initcall(pci_mmcfg_late_insert_resources);