arch/x86/pci/common.c - kernel/msm-4.19 - Gitiles

 /*
  *	Low-Level PCI Support for PC
  *
  *	(c) 1999--2000 Martin Mares <mj@ucw.cz>
  */

 #include <linux/sched.h>
 #include <linux/pci.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/dmi.h>
 #include <linux/slab.h>

 #include <asm-generic/pci-bridge.h>
 #include <asm/acpi.h>
 #include <asm/segment.h>
 #include <asm/io.h>
 #include <asm/smp.h>
 #include <asm/pci_x86.h>
 #include <asm/setup.h>

 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
 				PCI_PROBE_MMCONF;

 unsigned int pci_early_dump_regs;
 static int pci_bf_sort;
 static int smbios_type_b1_flag;
 int pci_routeirq;
 int noioapicquirk;
 #ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
 int noioapicreroute = 0;
 #else
 int noioapicreroute = 1;
 #endif
 int pcibios_last_bus = -1;
 unsigned long pirq_table_addr;
 struct pci_bus *pci_root_bus;
 const struct pci_raw_ops *__read_mostly raw_pci_ops;
 const struct pci_raw_ops *__read_mostly raw_pci_ext_ops;

 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
 						int reg, int len, u32 *val)
 {
 	if (domain == 0 && reg < 256 && raw_pci_ops)
 		return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
 	if (raw_pci_ext_ops)
 		return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
 	return -EINVAL;
 }

 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
 						int reg, int len, u32 val)
 {
 	if (domain == 0 && reg < 256 && raw_pci_ops)
 		return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
 	if (raw_pci_ext_ops)
 		return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
 	return -EINVAL;
 }

 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
 {
 	return raw_pci_read(pci_domain_nr(bus), bus->number,
 				 devfn, where, size, value);
 }

 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
 {
 	return raw_pci_write(pci_domain_nr(bus), bus->number,
 				  devfn, where, size, value);
 }

 struct pci_ops pci_root_ops = {
 	.read = pci_read,
 	.write = pci_write,
 };

 /*
  * This interrupt-safe spinlock protects all accesses to PCI
  * configuration space.
  */
 DEFINE_RAW_SPINLOCK(pci_config_lock);

 static int 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 const struct dmi_system_id can_skip_pciprobe_dmi_table[] = {
 /*
  * 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);
 }

 static void pcibios_fixup_device_resources(struct pci_dev *dev)
 {
 	struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
 	struct resource *bar_r;
 	int bar;

 	if (pci_probe & PCI_NOASSIGN_BARS) {
 		/*
 		* If the BIOS did not assign the BAR, zero out the
 		* resource so the kernel doesn't attmept to assign
 		* it later on in pci_assign_unassigned_resources
 		*/
 		for (bar = 0; bar <= PCI_STD_RESOURCE_END; bar++) {
 			bar_r = &dev->resource[bar];
 			if (bar_r->start == 0 && bar_r->end != 0) {
 				bar_r->flags = 0;
 				bar_r->end = 0;
 			}
 		}
 	}

 	if (pci_probe & PCI_NOASSIGN_ROMS) {
 		if (rom_r->parent)
 			return;
 		if (rom_r->start) {
 			/* we deal with BIOS assigned ROM later */
 			return;
 		}
 		rom_r->start = rom_r->end = rom_r->flags = 0;
 	}
 }

 /*
  *  Called after each bus is probed, but before its children
  *  are examined.
  */

 void pcibios_fixup_bus(struct pci_bus *b)
 {
 	struct pci_dev *dev;

 	pci_read_bridge_bases(b);
 	list_for_each_entry(dev, &b->devices, bus_list)
 		pcibios_fixup_device_resources(dev);
 }

 /*
  * Only use DMI information to set this if nothing was passed
  * on the kernel command line (which was parsed earlier).
  */

 static int set_bf_sort(const struct dmi_system_id *d)
 {
 	if (pci_bf_sort == pci_bf_sort_default) {
 		pci_bf_sort = pci_dmi_bf;
 		printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
 	}
 	return 0;
 }

 static void read_dmi_type_b1(const struct dmi_header *dm,
 				       void *private_data)
 {
 	u8 *d = (u8 *)dm + 4;

 	if (dm->type != 0xB1)
 		return;
 	switch (((*(u32 *)d) >> 9) & 0x03) {
 	case 0x00:
 		printk(KERN_INFO "dmi type 0xB1 record - unknown flag\n");
 		break;
 	case 0x01: /* set pci=bfsort */
 		smbios_type_b1_flag = 1;
 		break;
 	case 0x02: /* do not set pci=bfsort */
 		smbios_type_b1_flag = 2;
 		break;
 	default:
 		break;
 	}
 }

 static int find_sort_method(const struct dmi_system_id *d)
 {
 	dmi_walk(read_dmi_type_b1, NULL);

 	if (smbios_type_b1_flag == 1) {
 		set_bf_sort(d);
 		return 0;
 	}
 	return -1;
 }

 /*
  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
  */
 #ifdef __i386__
 static int assign_all_busses(const struct dmi_system_id *d)
 {
 	pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 	printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
 			" (pci=assign-busses)\n", d->ident);
 	return 0;
 }
 #endif

 static int set_scan_all(const struct dmi_system_id *d)
 {
 	printk(KERN_INFO "PCI: %s detected, enabling pci=pcie_scan_all\n",
 	       d->ident);
 	pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS);
 	return 0;
 }

 static const struct dmi_system_id pciprobe_dmi_table[] = {
 #ifdef __i386__
 /*
  * Laptops which need pci=assign-busses to see Cardbus cards
  */
 	{
 		.callback = assign_all_busses,
 		.ident = "Samsung X20 Laptop",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
 		},
 	},
 #endif		/* __i386__ */
 	{
 		.callback = set_bf_sort,
 		.ident = "Dell PowerEdge 1950",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "Dell PowerEdge 1955",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "Dell PowerEdge 2900",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "Dell PowerEdge 2950",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "Dell PowerEdge R900",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
 		},
 	},
 	{
 		.callback = find_sort_method,
 		.ident = "Dell System",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL20p G3",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL20p G4",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL30p G1",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL25p G1",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL35p G1",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL45p G1",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL45p G2",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL460c G1",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL465c G1",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL480c G1",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant BL685c G1",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant DL360",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant DL380",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
 		},
 	},
 #ifdef __i386__
 	{
 		.callback = assign_all_busses,
 		.ident = "Compaq EVO N800c",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
 		},
 	},
 #endif
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant DL385 G2",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
 		},
 	},
 	{
 		.callback = set_bf_sort,
 		.ident = "HP ProLiant DL585 G2",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
 		},
 	},
 	{
 		.callback = set_scan_all,
 		.ident = "Stratus/NEC ftServer",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Stratus"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "ftServer"),
 		},
 	},
 	{}
 };

 void __init dmi_check_pciprobe(void)
 {
 	dmi_check_system(pciprobe_dmi_table);
 }

 struct pci_bus *pcibios_scan_root(int busnum)
 {
 	struct pci_bus *bus = NULL;

 	while ((bus = pci_find_next_bus(bus)) != NULL) {
 		if (bus->number == busnum) {
 			/* Already scanned */
 			return bus;
 		}
 	}

 	return pci_scan_bus_on_node(busnum, &pci_root_ops,
 					get_mp_bus_to_node(busnum));
 }

 void __init pcibios_set_cache_line_size(void)
 {
 	struct cpuinfo_x86 *c = &boot_cpu_data;

 	/*
 	 * Set PCI cacheline size to that of the CPU if the CPU has reported it.
 	 * (For older CPUs that don't support cpuid, we se it to 32 bytes
 	 * It's also good for 386/486s (which actually have 16)
 	 * as quite a few PCI devices do not support smaller values.
 	 */
 	if (c->x86_clflush_size > 0) {
 		pci_dfl_cache_line_size = c->x86_clflush_size >> 2;
 		printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",
 			pci_dfl_cache_line_size << 2);
 	} else {
  		pci_dfl_cache_line_size = 32 >> 2;
 		printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");
 	}
 }

 int __init pcibios_init(void)
 {
 	if (!raw_pci_ops) {
 		printk(KERN_WARNING "PCI: System does not support PCI\n");
 		return 0;
 	}

 	pcibios_set_cache_line_size();
 	pcibios_resource_survey();

 	if (pci_bf_sort >= pci_force_bf)
 		pci_sort_breadthfirst();
 	return 0;
 }

 char * __init pcibios_setup(char *str)
 {
 	if (!strcmp(str, "off")) {
 		pci_probe = 0;
 		return NULL;
 	} else if (!strcmp(str, "bfsort")) {
 		pci_bf_sort = pci_force_bf;
 		return NULL;
 	} else if (!strcmp(str, "nobfsort")) {
 		pci_bf_sort = pci_force_nobf;
 		return NULL;
 	}
 #ifdef CONFIG_PCI_BIOS
 	else if (!strcmp(str, "bios")) {
 		pci_probe = PCI_PROBE_BIOS;
 		return NULL;
 	} else if (!strcmp(str, "nobios")) {
 		pci_probe &= ~PCI_PROBE_BIOS;
 		return NULL;
 	} else if (!strcmp(str, "biosirq")) {
 		pci_probe |= PCI_BIOS_IRQ_SCAN;
 		return NULL;
 	} else if (!strncmp(str, "pirqaddr=", 9)) {
 		pirq_table_addr = simple_strtoul(str+9, NULL, 0);
 		return NULL;
 	}
 #endif
 #ifdef CONFIG_PCI_DIRECT
 	else if (!strcmp(str, "conf1")) {
 		pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
 		return NULL;
 	}
 	else if (!strcmp(str, "conf2")) {
 		pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
 		return NULL;
 	}
 #endif
 #ifdef CONFIG_PCI_MMCONFIG
 	else if (!strcmp(str, "nommconf")) {
 		pci_probe &= ~PCI_PROBE_MMCONF;
 		return NULL;
 	}
 	else if (!strcmp(str, "check_enable_amd_mmconf")) {
 		pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
 		return NULL;
 	}
 #endif
 	else if (!strcmp(str, "noacpi")) {
 		acpi_noirq_set();
 		return NULL;
 	}
 	else if (!strcmp(str, "noearly")) {
 		pci_probe |= PCI_PROBE_NOEARLY;
 		return NULL;
 	}
 #ifndef CONFIG_X86_VISWS
 	else if (!strcmp(str, "usepirqmask")) {
 		pci_probe |= PCI_USE_PIRQ_MASK;
 		return NULL;
 	} else if (!strncmp(str, "irqmask=", 8)) {
 		pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
 		return NULL;
 	} else if (!strncmp(str, "lastbus=", 8)) {
 		pcibios_last_bus = simple_strtol(str+8, NULL, 0);
 		return NULL;
 	}
 #endif
 	else if (!strcmp(str, "rom")) {
 		pci_probe |= PCI_ASSIGN_ROMS;
 		return NULL;
 	} else if (!strcmp(str, "norom")) {
 		pci_probe |= PCI_NOASSIGN_ROMS;
 		return NULL;
 	} else if (!strcmp(str, "nobar")) {
 		pci_probe |= PCI_NOASSIGN_BARS;
 		return NULL;
 	} else if (!strcmp(str, "assign-busses")) {
 		pci_probe |= PCI_ASSIGN_ALL_BUSSES;
 		return NULL;
 	} else if (!strcmp(str, "use_crs")) {
 		pci_probe |= PCI_USE__CRS;
 		return NULL;
 	} else if (!strcmp(str, "nocrs")) {
 		pci_probe |= PCI_ROOT_NO_CRS;
 		return NULL;
 	} else if (!strcmp(str, "earlydump")) {
 		pci_early_dump_regs = 1;
 		return NULL;
 	} 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;
 	} else if (!strcmp(str, "noioapicquirk")) {
 		noioapicquirk = 1;
 		return NULL;
 	} else if (!strcmp(str, "ioapicreroute")) {
 		if (noioapicreroute != -1)
 			noioapicreroute = 0;
 		return NULL;
 	} else if (!strcmp(str, "noioapicreroute")) {
 		if (noioapicreroute != -1)
 			noioapicreroute = 1;
 		return NULL;
 	}
 	return str;
 }

 unsigned int pcibios_assign_all_busses(void)
 {
 	return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
 }

 int pcibios_add_device(struct pci_dev *dev)
 {
 	struct setup_data *data;
 	struct pci_setup_rom *rom;
 	u64 pa_data;

 	pa_data = boot_params.hdr.setup_data;
 	while (pa_data) {
 		data = phys_to_virt(pa_data);

 		if (data->type == SETUP_PCI) {
 			rom = (struct pci_setup_rom *)data;

 			if ((pci_domain_nr(dev->bus) == rom->segment) &&
 			    (dev->bus->number == rom->bus) &&
 			    (PCI_SLOT(dev->devfn) == rom->device) &&
 			    (PCI_FUNC(dev->devfn) == rom->function) &&
 			    (dev->vendor == rom->vendor) &&
 			    (dev->device == rom->devid)) {
 				dev->rom = pa_data +
 				      offsetof(struct pci_setup_rom, romdata);
 				dev->romlen = rom->pcilen;
 			}
 		}
 		pa_data = data->next;
 	}
 	return 0;
 }

 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
 	int err;

 	if ((err = pci_enable_resources(dev, mask)) < 0)
 		return err;

 	if (!pci_dev_msi_enabled(dev))
 		return pcibios_enable_irq(dev);
 	return 0;
 }

 void pcibios_disable_device (struct pci_dev *dev)
 {
 	if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
 		pcibios_disable_irq(dev);
 }

 int pci_ext_cfg_avail(void)
 {
 	if (raw_pci_ext_ops)
 		return 1;
 	else
 		return 0;
 }

 struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 {
 	LIST_HEAD(resources);
 	struct pci_bus *bus = NULL;
 	struct pci_sysdata *sd;

 	/*
 	 * Allocate per-root-bus (not per bus) arch-specific data.
 	 * TODO: leak; this memory is never freed.
 	 * It's arguable whether it's worth the trouble to care.
 	 */
 	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 	if (!sd) {
 		printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
 		return NULL;
 	}
 	sd->node = node;
 	x86_pci_root_bus_resources(busno, &resources);
 	printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busno);
 	bus = pci_scan_root_bus(NULL, busno, ops, sd, &resources);
 	if (!bus) {
 		pci_free_resource_list(&resources);
 		kfree(sd);
 	}

 	return bus;
 }

 struct pci_bus *pci_scan_bus_with_sysdata(int busno)
 {
 	return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
 }

 /*
  * NUMA info for PCI busses
  *
  * Early arch code is responsible for filling in reasonable values here.
  * A node id of "-1" means "use current node".  In other words, if a bus
  * has a -1 node id, it's not tightly coupled to any particular chunk
  * of memory (as is the case on some Nehalem systems).
  */
 #ifdef CONFIG_NUMA

 #define BUS_NR 256

 #ifdef CONFIG_X86_64

 static int mp_bus_to_node[BUS_NR] = {
 	[0 ... BUS_NR - 1] = -1
 };

 void set_mp_bus_to_node(int busnum, int node)
 {
 	if (busnum >= 0 &&  busnum < BUS_NR)
 		mp_bus_to_node[busnum] = node;
 }

 int get_mp_bus_to_node(int busnum)
 {
 	int node = -1;

 	if (busnum < 0 || busnum > (BUS_NR - 1))
 		return node;

 	node = mp_bus_to_node[busnum];

 	/*
 	 * let numa_node_id to decide it later in dma_alloc_pages
 	 * if there is no ram on that node
 	 */
 	if (node != -1 && !node_online(node))
 		node = -1;

 	return node;
 }

 #else /* CONFIG_X86_32 */

 static int mp_bus_to_node[BUS_NR] = {
 	[0 ... BUS_NR - 1] = -1
 };

 void set_mp_bus_to_node(int busnum, int node)
 {
 	if (busnum >= 0 &&  busnum < BUS_NR)
 	mp_bus_to_node[busnum] = (unsigned char) node;
 }

 int get_mp_bus_to_node(int busnum)
 {
 	int node;

 	if (busnum < 0 || busnum > (BUS_NR - 1))
 		return 0;
 	node = mp_bus_to_node[busnum];
 	return node;
 }

 #endif /* CONFIG_X86_32 */

 #endif /* CONFIG_NUMA */
	/*
	* Low-Level PCI Support for PC
	*
	* (c) 1999--2000 Martin Mares <mj@ucw.cz>
	*/

	#include <linux/sched.h>
	#include <linux/pci.h>
	#include <linux/ioport.h>
	#include <linux/init.h>
	#include <linux/dmi.h>
	#include <linux/slab.h>

	#include <asm-generic/pci-bridge.h>
	#include <asm/acpi.h>
	#include <asm/segment.h>
	#include <asm/io.h>
	#include <asm/smp.h>
	#include <asm/pci_x86.h>
	#include <asm/setup.h>

	unsigned int pci_probe = PCI_PROBE_BIOS \| PCI_PROBE_CONF1 \| PCI_PROBE_CONF2 \|
	PCI_PROBE_MMCONF;

	unsigned int pci_early_dump_regs;
	static int pci_bf_sort;
	static int smbios_type_b1_flag;
	int pci_routeirq;
	int noioapicquirk;
	#ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
	int noioapicreroute = 0;
	#else
	int noioapicreroute = 1;
	#endif
	int pcibios_last_bus = -1;
	unsigned long pirq_table_addr;
	struct pci_bus *pci_root_bus;
	const struct pci_raw_ops *__read_mostly raw_pci_ops;
	const struct pci_raw_ops *__read_mostly raw_pci_ext_ops;

	int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
	int reg, int len, u32 *val)
	{
	if (domain == 0 && reg < 256 && raw_pci_ops)
	return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
	if (raw_pci_ext_ops)
	return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
	return -EINVAL;
	}

	int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
	int reg, int len, u32 val)
	{
	if (domain == 0 && reg < 256 && raw_pci_ops)
	return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
	if (raw_pci_ext_ops)
	return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
	return -EINVAL;
	}

	static int pci_read(struct pci_bus bus, unsigned int devfn, int where, int size, u32 value)
	{
	return raw_pci_read(pci_domain_nr(bus), bus->number,
	devfn, where, size, value);
	}

	static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
	{
	return raw_pci_write(pci_domain_nr(bus), bus->number,
	devfn, where, size, value);
	}

	struct pci_ops pci_root_ops = {
	.read = pci_read,
	.write = pci_write,
	};

	/*
	* This interrupt-safe spinlock protects all accesses to PCI
	* configuration space.
	*/
	DEFINE_RAW_SPINLOCK(pci_config_lock);

	static int 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 const struct dmi_system_id can_skip_pciprobe_dmi_table[] = {
	/*
	* 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);
	}

	static void pcibios_fixup_device_resources(struct pci_dev *dev)
	{
	struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
	struct resource *bar_r;
	int bar;

	if (pci_probe & PCI_NOASSIGN_BARS) {
	/*
	* If the BIOS did not assign the BAR, zero out the
	* resource so the kernel doesn't attmept to assign
	* it later on in pci_assign_unassigned_resources
	*/
	for (bar = 0; bar <= PCI_STD_RESOURCE_END; bar++) {
	bar_r = &dev->resource[bar];
	if (bar_r->start == 0 && bar_r->end != 0) {
	bar_r->flags = 0;
	bar_r->end = 0;
	}
	}
	}

	if (pci_probe & PCI_NOASSIGN_ROMS) {
	if (rom_r->parent)
	return;
	if (rom_r->start) {
	/* we deal with BIOS assigned ROM later */
	return;
	}
	rom_r->start = rom_r->end = rom_r->flags = 0;
	}
	}

	/*
	* Called after each bus is probed, but before its children
	* are examined.
	*/

	void pcibios_fixup_bus(struct pci_bus *b)
	{
	struct pci_dev *dev;

	pci_read_bridge_bases(b);
	list_for_each_entry(dev, &b->devices, bus_list)
	pcibios_fixup_device_resources(dev);
	}

	/*
	* Only use DMI information to set this if nothing was passed
	* on the kernel command line (which was parsed earlier).
	*/

	static int set_bf_sort(const struct dmi_system_id *d)
	{
	if (pci_bf_sort == pci_bf_sort_default) {
	pci_bf_sort = pci_dmi_bf;
	printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
	}
	return 0;
	}

	static void read_dmi_type_b1(const struct dmi_header *dm,
	void *private_data)
	{
	u8 d = (u8 )dm + 4;

	if (dm->type != 0xB1)
	return;
	switch ((((u32 )d) >> 9) & 0x03) {
	case 0x00:
	printk(KERN_INFO "dmi type 0xB1 record - unknown flag\n");
	break;
	case 0x01: /* set pci=bfsort */
	smbios_type_b1_flag = 1;
	break;
	case 0x02: /* do not set pci=bfsort */
	smbios_type_b1_flag = 2;
	break;
	default:
	break;
	}
	}

	static int find_sort_method(const struct dmi_system_id *d)
	{
	dmi_walk(read_dmi_type_b1, NULL);

	if (smbios_type_b1_flag == 1) {
	set_bf_sort(d);
	return 0;
	}
	return -1;
	}

	/*
	* Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
	*/
	#ifdef __i386__
	static int assign_all_busses(const struct dmi_system_id *d)
	{
	pci_probe \|= PCI_ASSIGN_ALL_BUSSES;
	printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
	" (pci=assign-busses)\n", d->ident);
	return 0;
	}
	#endif

	static int set_scan_all(const struct dmi_system_id *d)
	{
	printk(KERN_INFO "PCI: %s detected, enabling pci=pcie_scan_all\n",
	d->ident);
	pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS);
	return 0;
	}

	static const struct dmi_system_id pciprobe_dmi_table[] = {
	#ifdef __i386__
	/*
	* Laptops which need pci=assign-busses to see Cardbus cards
	*/
	{
	.callback = assign_all_busses,
	.ident = "Samsung X20 Laptop",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
	DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
	},
	},
	#endif /* __i386__ */
	{
	.callback = set_bf_sort,
	.ident = "Dell PowerEdge 1950",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "Dell PowerEdge 1955",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "Dell PowerEdge 2900",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "Dell PowerEdge 2950",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "Dell PowerEdge R900",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
	},
	},
	{
	.callback = find_sort_method,
	.ident = "Dell System",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL20p G3",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL20p G4",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL30p G1",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL25p G1",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL35p G1",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL45p G1",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL45p G2",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL460c G1",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL465c G1",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL480c G1",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant BL685c G1",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant DL360",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant DL380",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
	},
	},
	#ifdef __i386__
	{
	.callback = assign_all_busses,
	.ident = "Compaq EVO N800c",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
	DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
	},
	},
	#endif
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant DL385 G2",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
	},
	},
	{
	.callback = set_bf_sort,
	.ident = "HP ProLiant DL585 G2",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
	},
	},
	{
	.callback = set_scan_all,
	.ident = "Stratus/NEC ftServer",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Stratus"),
	DMI_MATCH(DMI_PRODUCT_NAME, "ftServer"),
	},
	},
	{}
	};

	void __init dmi_check_pciprobe(void)
	{
	dmi_check_system(pciprobe_dmi_table);
	}

	struct pci_bus *pcibios_scan_root(int busnum)
	{
	struct pci_bus *bus = NULL;

	while ((bus = pci_find_next_bus(bus)) != NULL) {
	if (bus->number == busnum) {
	/* Already scanned */
	return bus;
	}
	}

	return pci_scan_bus_on_node(busnum, &pci_root_ops,
	get_mp_bus_to_node(busnum));
	}

	void __init pcibios_set_cache_line_size(void)
	{
	struct cpuinfo_x86 *c = &boot_cpu_data;

	/*
	* Set PCI cacheline size to that of the CPU if the CPU has reported it.
	* (For older CPUs that don't support cpuid, we se it to 32 bytes
	* It's also good for 386/486s (which actually have 16)
	* as quite a few PCI devices do not support smaller values.
	*/
	if (c->x86_clflush_size > 0) {
	pci_dfl_cache_line_size = c->x86_clflush_size >> 2;
	printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",
	pci_dfl_cache_line_size << 2);
	} else {
	pci_dfl_cache_line_size = 32 >> 2;
	printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");
	}
	}

	int __init pcibios_init(void)
	{
	if (!raw_pci_ops) {
	printk(KERN_WARNING "PCI: System does not support PCI\n");
	return 0;
	}

	pcibios_set_cache_line_size();
	pcibios_resource_survey();

	if (pci_bf_sort >= pci_force_bf)
	pci_sort_breadthfirst();
	return 0;
	}

	char * __init pcibios_setup(char *str)
	{
	if (!strcmp(str, "off")) {
	pci_probe = 0;
	return NULL;
	} else if (!strcmp(str, "bfsort")) {
	pci_bf_sort = pci_force_bf;
	return NULL;
	} else if (!strcmp(str, "nobfsort")) {
	pci_bf_sort = pci_force_nobf;
	return NULL;
	}
	#ifdef CONFIG_PCI_BIOS
	else if (!strcmp(str, "bios")) {
	pci_probe = PCI_PROBE_BIOS;
	return NULL;
	} else if (!strcmp(str, "nobios")) {
	pci_probe &= ~PCI_PROBE_BIOS;
	return NULL;
	} else if (!strcmp(str, "biosirq")) {
	pci_probe \|= PCI_BIOS_IRQ_SCAN;
	return NULL;
	} else if (!strncmp(str, "pirqaddr=", 9)) {
	pirq_table_addr = simple_strtoul(str+9, NULL, 0);
	return NULL;
	}
	#endif
	#ifdef CONFIG_PCI_DIRECT
	else if (!strcmp(str, "conf1")) {
	pci_probe = PCI_PROBE_CONF1 \| PCI_NO_CHECKS;
	return NULL;
	}
	else if (!strcmp(str, "conf2")) {
	pci_probe = PCI_PROBE_CONF2 \| PCI_NO_CHECKS;
	return NULL;
	}
	#endif
	#ifdef CONFIG_PCI_MMCONFIG
	else if (!strcmp(str, "nommconf")) {
	pci_probe &= ~PCI_PROBE_MMCONF;
	return NULL;
	}
	else if (!strcmp(str, "check_enable_amd_mmconf")) {
	pci_probe \|= PCI_CHECK_ENABLE_AMD_MMCONF;
	return NULL;
	}
	#endif
	else if (!strcmp(str, "noacpi")) {
	acpi_noirq_set();
	return NULL;
	}
	else if (!strcmp(str, "noearly")) {
	pci_probe \|= PCI_PROBE_NOEARLY;
	return NULL;
	}
	#ifndef CONFIG_X86_VISWS
	else if (!strcmp(str, "usepirqmask")) {
	pci_probe \|= PCI_USE_PIRQ_MASK;
	return NULL;
	} else if (!strncmp(str, "irqmask=", 8)) {
	pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
	return NULL;
	} else if (!strncmp(str, "lastbus=", 8)) {
	pcibios_last_bus = simple_strtol(str+8, NULL, 0);
	return NULL;
	}
	#endif
	else if (!strcmp(str, "rom")) {
	pci_probe \|= PCI_ASSIGN_ROMS;
	return NULL;
	} else if (!strcmp(str, "norom")) {
	pci_probe \|= PCI_NOASSIGN_ROMS;
	return NULL;
	} else if (!strcmp(str, "nobar")) {
	pci_probe \|= PCI_NOASSIGN_BARS;
	return NULL;
	} else if (!strcmp(str, "assign-busses")) {
	pci_probe \|= PCI_ASSIGN_ALL_BUSSES;
	return NULL;
	} else if (!strcmp(str, "use_crs")) {
	pci_probe \|= PCI_USE__CRS;
	return NULL;
	} else if (!strcmp(str, "nocrs")) {
	pci_probe \|= PCI_ROOT_NO_CRS;
	return NULL;
	} else if (!strcmp(str, "earlydump")) {
	pci_early_dump_regs = 1;
	return NULL;
	} 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;
	} else if (!strcmp(str, "noioapicquirk")) {
	noioapicquirk = 1;
	return NULL;
	} else if (!strcmp(str, "ioapicreroute")) {
	if (noioapicreroute != -1)
	noioapicreroute = 0;
	return NULL;
	} else if (!strcmp(str, "noioapicreroute")) {
	if (noioapicreroute != -1)
	noioapicreroute = 1;
	return NULL;
	}
	return str;
	}

	unsigned int pcibios_assign_all_busses(void)
	{
	return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
	}

	int pcibios_add_device(struct pci_dev *dev)
	{
	struct setup_data *data;
	struct pci_setup_rom *rom;
	u64 pa_data;

	pa_data = boot_params.hdr.setup_data;
	while (pa_data) {
	data = phys_to_virt(pa_data);

	if (data->type == SETUP_PCI) {
	rom = (struct pci_setup_rom *)data;

	if ((pci_domain_nr(dev->bus) == rom->segment) &&
	(dev->bus->number == rom->bus) &&
	(PCI_SLOT(dev->devfn) == rom->device) &&
	(PCI_FUNC(dev->devfn) == rom->function) &&
	(dev->vendor == rom->vendor) &&
	(dev->device == rom->devid)) {
	dev->rom = pa_data +
	offsetof(struct pci_setup_rom, romdata);
	dev->romlen = rom->pcilen;
	}
	}
	pa_data = data->next;
	}
	return 0;
	}

	int pcibios_enable_device(struct pci_dev *dev, int mask)
	{
	int err;

	if ((err = pci_enable_resources(dev, mask)) < 0)
	return err;

	if (!pci_dev_msi_enabled(dev))
	return pcibios_enable_irq(dev);
	return 0;
	}

	void pcibios_disable_device (struct pci_dev *dev)
	{
	if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
	pcibios_disable_irq(dev);
	}

	int pci_ext_cfg_avail(void)
	{
	if (raw_pci_ext_ops)
	return 1;
	else
	return 0;
	}

	struct pci_bus pci_scan_bus_on_node(int busno, struct pci_ops ops, int node)
	{
	LIST_HEAD(resources);
	struct pci_bus *bus = NULL;
	struct pci_sysdata *sd;

	/*
	* Allocate per-root-bus (not per bus) arch-specific data.
	* TODO: leak; this memory is never freed.
	* It's arguable whether it's worth the trouble to care.
	*/
	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
	if (!sd) {
	printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
	return NULL;
	}
	sd->node = node;
	x86_pci_root_bus_resources(busno, &resources);
	printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busno);
	bus = pci_scan_root_bus(NULL, busno, ops, sd, &resources);
	if (!bus) {
	pci_free_resource_list(&resources);
	kfree(sd);
	}

	return bus;
	}

	struct pci_bus *pci_scan_bus_with_sysdata(int busno)
	{
	return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
	}

	/*
	* NUMA info for PCI busses
	*
	* Early arch code is responsible for filling in reasonable values here.
	* A node id of "-1" means "use current node". In other words, if a bus
	* has a -1 node id, it's not tightly coupled to any particular chunk
	* of memory (as is the case on some Nehalem systems).
	*/
	#ifdef CONFIG_NUMA

	#define BUS_NR 256

	#ifdef CONFIG_X86_64

	static int mp_bus_to_node[BUS_NR] = {
	[0 ... BUS_NR - 1] = -1
	};

	void set_mp_bus_to_node(int busnum, int node)
	{
	if (busnum >= 0 && busnum < BUS_NR)
	mp_bus_to_node[busnum] = node;
	}

	int get_mp_bus_to_node(int busnum)
	{
	int node = -1;

	if (busnum < 0 \|\| busnum > (BUS_NR - 1))
	return node;

	node = mp_bus_to_node[busnum];

	/*
	* let numa_node_id to decide it later in dma_alloc_pages
	* if there is no ram on that node
	*/
	if (node != -1 && !node_online(node))
	node = -1;

	return node;
	}

	#else /* CONFIG_X86_32 */

	static int mp_bus_to_node[BUS_NR] = {
	[0 ... BUS_NR - 1] = -1
	};

	void set_mp_bus_to_node(int busnum, int node)
	{
	if (busnum >= 0 && busnum < BUS_NR)
	mp_bus_to_node[busnum] = (unsigned char) node;
	}

	int get_mp_bus_to_node(int busnum)
	{
	int node;

	if (busnum < 0 \|\| busnum > (BUS_NR - 1))
	return 0;
	node = mp_bus_to_node[busnum];
	return node;
	}

	#endif /* CONFIG_X86_32 */

	#endif /* CONFIG_NUMA */