[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / pci / acpi.c

#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/dmi.h>
#include <linux/slab.h>
#include <asm/numa.h>
#include <asm/pci_x86.h>

struct pci_root_info {
	struct acpi_device *bridge;
	char *name;
	unsigned int res_num;
	struct resource *res;
	struct pci_bus *bus;
	int busnum;
};

static bool pci_use_crs = true;

static int __init set_use_crs(const struct dmi_system_id *id)
{
	pci_use_crs = true;
	return 0;
}

static const struct dmi_system_id pci_use_crs_table[] __initconst = {
	/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
	{
		.callback = set_use_crs,
		.ident = "IBM System x3800",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
			DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
		},
	},
	/* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
	/* 2006 AMD HT/VIA system with two host bridges */
        {
		.callback = set_use_crs,
		.ident = "ASRock ALiveSATA2-GLAN",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
                },
        },
	{}
};

void __init pci_acpi_crs_quirks(void)
{
	int year;

	if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
		pci_use_crs = false;

	dmi_check_system(pci_use_crs_table);

	/*
	 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
	 * takes precedence over anything we figured out above.
	 */
	if (pci_probe & PCI_ROOT_NO_CRS)
		pci_use_crs = false;
	else if (pci_probe & PCI_USE__CRS)
		pci_use_crs = true;

	printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
	       "if necessary, use \"pci=%s\" and report a bug\n",
	       pci_use_crs ? "Using" : "Ignoring",
	       pci_use_crs ? "nocrs" : "use_crs");
}

static acpi_status
resource_to_addr(struct acpi_resource *resource,
			struct acpi_resource_address64 *addr)
{
	acpi_status status;
	struct acpi_resource_memory24 *memory24;
	struct acpi_resource_memory32 *memory32;
	struct acpi_resource_fixed_memory32 *fixed_memory32;

	memset(addr, 0, sizeof(*addr));
	switch (resource->type) {
	case ACPI_RESOURCE_TYPE_MEMORY24:
		memory24 = &resource->data.memory24;
		addr->resource_type = ACPI_MEMORY_RANGE;
		addr->minimum = memory24->minimum;
		addr->address_length = memory24->address_length;
		addr->maximum = addr->minimum + addr->address_length - 1;
		return AE_OK;
	case ACPI_RESOURCE_TYPE_MEMORY32:
		memory32 = &resource->data.memory32;
		addr->resource_type = ACPI_MEMORY_RANGE;
		addr->minimum = memory32->minimum;
		addr->address_length = memory32->address_length;
		addr->maximum = addr->minimum + addr->address_length - 1;
		return AE_OK;
	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
		fixed_memory32 = &resource->data.fixed_memory32;
		addr->resource_type = ACPI_MEMORY_RANGE;
		addr->minimum = fixed_memory32->address;
		addr->address_length = fixed_memory32->address_length;
		addr->maximum = addr->minimum + addr->address_length - 1;
		return AE_OK;
	case ACPI_RESOURCE_TYPE_ADDRESS16:
	case ACPI_RESOURCE_TYPE_ADDRESS32:
	case ACPI_RESOURCE_TYPE_ADDRESS64:
		status = acpi_resource_to_address64(resource, addr);
		if (ACPI_SUCCESS(status) &&
		    (addr->resource_type == ACPI_MEMORY_RANGE ||
		    addr->resource_type == ACPI_IO_RANGE) &&
		    addr->address_length > 0) {
			return AE_OK;
		}
		break;
	}
	return AE_ERROR;
}

static acpi_status
count_resource(struct acpi_resource *acpi_res, void *data)
{
	struct pci_root_info *info = data;
	struct acpi_resource_address64 addr;
	acpi_status status;

	status = resource_to_addr(acpi_res, &addr);
	if (ACPI_SUCCESS(status))
		info->res_num++;
	return AE_OK;
}

static acpi_status
setup_resource(struct acpi_resource *acpi_res, void *data)
{
	struct pci_root_info *info = data;
	struct resource *res;
	struct acpi_resource_address64 addr;
	acpi_status status;
	unsigned long flags;
	u64 start, end;

	status = resource_to_addr(acpi_res, &addr);
	if (!ACPI_SUCCESS(status))
		return AE_OK;

	if (addr.resource_type == ACPI_MEMORY_RANGE) {
		flags = IORESOURCE_MEM;
		if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
			flags |= IORESOURCE_PREFETCH;
	} else if (addr.resource_type == ACPI_IO_RANGE) {
		flags = IORESOURCE_IO;
	} else
		return AE_OK;

	start = addr.minimum + addr.translation_offset;
	end = addr.maximum + addr.translation_offset;

	res = &info->res[info->res_num];
	res->name = info->name;
	res->flags = flags;
	res->start = start;
	res->end = end;
	res->child = NULL;

	if (!pci_use_crs) {
		dev_printk(KERN_DEBUG, &info->bridge->dev,
			   "host bridge window %pR (ignored)\n", res);
		return AE_OK;
	}

	info->res_num++;
	if (addr.translation_offset)
		dev_info(&info->bridge->dev, "host bridge window %pR "
			 "(PCI address [%#llx-%#llx])\n",
			 res, res->start - addr.translation_offset,
			 res->end - addr.translation_offset);
	else
		dev_info(&info->bridge->dev, "host bridge window %pR\n", res);

	return AE_OK;
}

static bool resource_contains(struct resource *res, resource_size_t point)
{
	if (res->start <= point && point <= res->end)
		return true;
	return false;
}

static void coalesce_windows(struct pci_root_info *info, int type)
{
	int i, j;
	struct resource *res1, *res2;

	for (i = 0; i < info->res_num; i++) {
		res1 = &info->res[i];
		if (!(res1->flags & type))
			continue;

		for (j = i + 1; j < info->res_num; j++) {
			res2 = &info->res[j];
			if (!(res2->flags & type))
				continue;

			/*
			 * I don't like throwing away windows because then
			 * our resources no longer match the ACPI _CRS, but
			 * the kernel resource tree doesn't allow overlaps.
			 */
			if (resource_contains(res1, res2->start) ||
			    resource_contains(res1, res2->end) ||
			    resource_contains(res2, res1->start) ||
			    resource_contains(res2, res1->end)) {
				res1->start = min(res1->start, res2->start);
				res1->end = max(res1->end, res2->end);
				dev_info(&info->bridge->dev,
					 "host bridge window expanded to %pR; %pR ignored\n",
					 res1, res2);
				res2->flags = 0;
			}
		}
	}
}

static void add_resources(struct pci_root_info *info)
{
	int i;
	struct resource *res, *root, *conflict;

	if (!pci_use_crs)
		return;

	coalesce_windows(info, IORESOURCE_MEM);
	coalesce_windows(info, IORESOURCE_IO);

	for (i = 0; i < info->res_num; i++) {
		res = &info->res[i];

		if (res->flags & IORESOURCE_MEM)
			root = &iomem_resource;
		else if (res->flags & IORESOURCE_IO)
			root = &ioport_resource;
		else
			continue;

		conflict = insert_resource_conflict(root, res);
		if (conflict)
			dev_err(&info->bridge->dev,
				"address space collision: host bridge window %pR "
				"conflicts with %s %pR\n",
				res, conflict->name, conflict);
		else
			pci_bus_add_resource(info->bus, res, 0);
	}
}

static void
get_current_resources(struct acpi_device *device, int busnum,
			int domain, struct pci_bus *bus)
{
	struct pci_root_info info;
	size_t size;

	if (pci_use_crs)
		pci_bus_remove_resources(bus);

	info.bridge = device;
	info.bus = bus;
	info.res_num = 0;
	acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
				&info);
	if (!info.res_num)
		return;

	size = sizeof(*info.res) * info.res_num;
	info.res = kmalloc(size, GFP_KERNEL);
	if (!info.res)
		goto res_alloc_fail;

	info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
	if (!info.name)
		goto name_alloc_fail;

	info.res_num = 0;
	acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
				&info);

	add_resources(&info);
	return;

name_alloc_fail:
	kfree(info.res);
res_alloc_fail:
	return;
}

struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
{
	struct acpi_device *device = root->device;
	int domain = root->segment;
	int busnum = root->secondary.start;
	struct pci_bus *bus;
	struct pci_sysdata *sd;
	int node;
#ifdef CONFIG_ACPI_NUMA
	int pxm;
#endif

	if (domain && !pci_domains_supported) {
		printk(KERN_WARNING "pci_bus %04x:%02x: "
		       "ignored (multiple domains not supported)\n",
		       domain, busnum);
		return NULL;
	}

	node = -1;
#ifdef CONFIG_ACPI_NUMA
	pxm = acpi_get_pxm(device->handle);
	if (pxm >= 0)
		node = pxm_to_node(pxm);
	if (node != -1)
		set_mp_bus_to_node(busnum, node);
	else
#endif
		node = get_mp_bus_to_node(busnum);

	if (node != -1 && !node_online(node))
		node = -1;

	/* 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_WARNING "pci_bus %04x:%02x: "
		       "ignored (out of memory)\n", domain, busnum);
		return NULL;
	}

	sd->domain = domain;
	sd->node = node;
	/*
	 * Maybe the desired pci bus has been already scanned. In such case
	 * it is unnecessary to scan the pci bus with the given domain,busnum.
	 */
	bus = pci_find_bus(domain, busnum);
	if (bus) {
		/*
		 * If the desired bus exits, the content of bus->sysdata will
		 * be replaced by sd.
		 */
		memcpy(bus->sysdata, sd, sizeof(*sd));
		kfree(sd);
	} else {
		bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
		if (bus) {
			get_current_resources(device, busnum, domain, bus);
			bus->subordinate = pci_scan_child_bus(bus);
		}
	}

	if (!bus)
		kfree(sd);

	if (bus && node != -1) {
#ifdef CONFIG_ACPI_NUMA
		if (pxm >= 0)
			dev_printk(KERN_DEBUG, &bus->dev,
				   "on NUMA node %d (pxm %d)\n", node, pxm);
#else
		dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
#endif
	}

	return bus;
}

int __init pci_acpi_init(void)
{
	struct pci_dev *dev = NULL;

	if (acpi_noirq)
		return -ENODEV;

	printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
	acpi_irq_penalty_init();
	pcibios_enable_irq = acpi_pci_irq_enable;
	pcibios_disable_irq = acpi_pci_irq_disable;
	x86_init.pci.init_irq = x86_init_noop;

	if (pci_routeirq) {
		/*
		 * PCI IRQ routing is set up by pci_enable_device(), but we
		 * also do it here in case there are still broken drivers that
		 * don't use pci_enable_device().
		 */
		printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
		for_each_pci_dev(dev)
			acpi_pci_irq_enable(dev);
	}

	return 0;
}
Commit	Line	Data
1da177e4 LT	1	#include <linux/pci.h>
	2	#include <linux/acpi.h>
	3	#include <linux/init.h>
b33fa1f3	4	#include <linux/irq.h>
036fff4c	5	#include <linux/dmi.h>
5a0e3ad6	6	#include <linux/slab.h>
69e1a33f	7	#include <asm/numa.h>
82487711	8	#include <asm/pci_x86.h>
1da177e4	9
62f420f8	10	struct pci_root_info {
42887b29	11	struct acpi_device *bridge;
62f420f8 GH	12	char *name;
	13	unsigned int res_num;
	14	struct resource *res;
	15	struct pci_bus *bus;
	16	int busnum;
	17	};
	18
7bc5e3f2 BH	19	static bool pci_use_crs = true;
	20
	21	static int __init set_use_crs(const struct dmi_system_id *id)
	22	{
	23	pci_use_crs = true;
	24	return 0;
	25	}
	26
	27	static const struct dmi_system_id pci_use_crs_table[] __initconst = {
	28	/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
	29	{
	30	.callback = set_use_crs,
	31	.ident = "IBM System x3800",
	32	.matches = {
	33	DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
	34	DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
	35	},
	36	},
2491762c BH	37	/* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
	38	/* 2006 AMD HT/VIA system with two host bridges */
	39	{
	40	.callback = set_use_crs,
	41	.ident = "ASRock ALiveSATA2-GLAN",
	42	.matches = {
	43	DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
	44	},
	45	},
7bc5e3f2 BH	46	{}
	47	};
	48
	49	void __init pci_acpi_crs_quirks(void)
	50	{
	51	int year;
	52
	53	if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
	54	pci_use_crs = false;
	55
	56	dmi_check_system(pci_use_crs_table);
	57
	58	/*
	59	* If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
	60	* takes precedence over anything we figured out above.
	61	*/
	62	if (pci_probe & PCI_ROOT_NO_CRS)
	63	pci_use_crs = false;
	64	else if (pci_probe & PCI_USE__CRS)
	65	pci_use_crs = true;
	66
	67	printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
	68	"if necessary, use \"pci=%s\" and report a bug\n",
	69	pci_use_crs ? "Using" : "Ignoring",
	70	pci_use_crs ? "nocrs" : "use_crs");
	71	}
	72
62f420f8 GH	73	static acpi_status
	74	resource_to_addr(struct acpi_resource *resource,
	75	struct acpi_resource_address64 *addr)
	76	{
	77	acpi_status status;
66528fdd BH	78	struct acpi_resource_memory24 *memory24;
	79	struct acpi_resource_memory32 *memory32;
	80	struct acpi_resource_fixed_memory32 *fixed_memory32;
62f420f8	81
66528fdd BH	82	memset(addr, 0, sizeof(*addr));
	83	switch (resource->type) {
	84	case ACPI_RESOURCE_TYPE_MEMORY24:
	85	memory24 = &resource->data.memory24;
	86	addr->resource_type = ACPI_MEMORY_RANGE;
	87	addr->minimum = memory24->minimum;
	88	addr->address_length = memory24->address_length;
	89	addr->maximum = addr->minimum + addr->address_length - 1;
62f420f8	90	return AE_OK;
66528fdd BH	91	case ACPI_RESOURCE_TYPE_MEMORY32:
	92	memory32 = &resource->data.memory32;
	93	addr->resource_type = ACPI_MEMORY_RANGE;
	94	addr->minimum = memory32->minimum;
	95	addr->address_length = memory32->address_length;
	96	addr->maximum = addr->minimum + addr->address_length - 1;
	97	return AE_OK;
	98	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
	99	fixed_memory32 = &resource->data.fixed_memory32;
	100	addr->resource_type = ACPI_MEMORY_RANGE;
	101	addr->minimum = fixed_memory32->address;
	102	addr->address_length = fixed_memory32->address_length;
	103	addr->maximum = addr->minimum + addr->address_length - 1;
	104	return AE_OK;
	105	case ACPI_RESOURCE_TYPE_ADDRESS16:
	106	case ACPI_RESOURCE_TYPE_ADDRESS32:
	107	case ACPI_RESOURCE_TYPE_ADDRESS64:
	108	status = acpi_resource_to_address64(resource, addr);
	109	if (ACPI_SUCCESS(status) &&
	110	(addr->resource_type == ACPI_MEMORY_RANGE \|\|
	111	addr->resource_type == ACPI_IO_RANGE) &&
	112	addr->address_length > 0) {
	113	return AE_OK;
	114	}
	115	break;
62f420f8 GH	116	}
	117	return AE_ERROR;
	118	}
	119
	120	static acpi_status
	121	count_resource(struct acpi_resource acpi_res, void data)
	122	{
	123	struct pci_root_info *info = data;
	124	struct acpi_resource_address64 addr;
	125	acpi_status status;
	126
	127	status = resource_to_addr(acpi_res, &addr);
	128	if (ACPI_SUCCESS(status))
	129	info->res_num++;
	130	return AE_OK;
	131	}
	132
	133	static acpi_status
	134	setup_resource(struct acpi_resource acpi_res, void data)
	135	{
	136	struct pci_root_info *info = data;
	137	struct resource *res;
	138	struct acpi_resource_address64 addr;
	139	acpi_status status;
	140	unsigned long flags;
48728e07	141	u64 start, end;
2cdb3f1d	142
62f420f8 GH	143	status = resource_to_addr(acpi_res, &addr);
	144	if (!ACPI_SUCCESS(status))
	145	return AE_OK;
	146
	147	if (addr.resource_type == ACPI_MEMORY_RANGE) {
62f420f8 GH	148	flags = IORESOURCE_MEM;
	149	if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
	150	flags \|= IORESOURCE_PREFETCH;
	151	} else if (addr.resource_type == ACPI_IO_RANGE) {
62f420f8 GH	152	flags = IORESOURCE_IO;
	153	} else
	154	return AE_OK;
	155
2cdb3f1d	156	start = addr.minimum + addr.translation_offset;
48728e07	157	end = addr.maximum + addr.translation_offset;
f9cde5ff	158
2cdb3f1d YL	159	res = &info->res[info->res_num];
	160	res->name = info->name;
	161	res->flags = flags;
	162	res->start = start;
	163	res->end = end;
	164	res->child = NULL;
	165
7bc5e3f2	166	if (!pci_use_crs) {
f1db6fde BH	167	dev_printk(KERN_DEBUG, &info->bridge->dev,
	168	"host bridge window %pR (ignored)\n", res);
	169	return AE_OK;
	170	}
	171
4723d0f2 BH	172	info->res_num++;
	173	if (addr.translation_offset)
	174	dev_info(&info->bridge->dev, "host bridge window %pR "
	175	"(PCI address [%#llx-%#llx])\n",
	176	res, res->start - addr.translation_offset,
	177	res->end - addr.translation_offset);
	178	else
	179	dev_info(&info->bridge->dev, "host bridge window %pR\n", res);
	180
	181	return AE_OK;
	182	}
	183
	184	static bool resource_contains(struct resource *res, resource_size_t point)
	185	{
	186	if (res->start <= point && point <= res->end)
	187	return true;
	188	return false;
	189	}
	190
	191	static void coalesce_windows(struct pci_root_info *info, int type)
	192	{
	193	int i, j;
	194	struct resource res1, res2;
	195
	196	for (i = 0; i < info->res_num; i++) {
	197	res1 = &info->res[i];
	198	if (!(res1->flags & type))
	199	continue;
	200
	201	for (j = i + 1; j < info->res_num; j++) {
	202	res2 = &info->res[j];
	203	if (!(res2->flags & type))
	204	continue;
	205
	206	/*
	207	* I don't like throwing away windows because then
	208	* our resources no longer match the ACPI _CRS, but
	209	* the kernel resource tree doesn't allow overlaps.
	210	*/
	211	if (resource_contains(res1, res2->start) \|\|
	212	resource_contains(res1, res2->end) \|\|
	213	resource_contains(res2, res1->start) \|\|
	214	resource_contains(res2, res1->end)) {
	215	res1->start = min(res1->start, res2->start);
	216	res1->end = max(res1->end, res2->end);
	217	dev_info(&info->bridge->dev,
	218	"host bridge window expanded to %pR; %pR ignored\n",
	219	res1, res2);
	220	res2->flags = 0;
	221	}
	222	}
	223	}
	224	}
	225
	226	static void add_resources(struct pci_root_info *info)
	227	{
	228	int i;
	229	struct resource res, root, *conflict;
	230
	231	if (!pci_use_crs)
	232	return;
	233
	234	coalesce_windows(info, IORESOURCE_MEM);
	235	coalesce_windows(info, IORESOURCE_IO);
236
237	for (i = 0; i < info->res_num; i++) {
238	res = &info->res[i];
239
240	if (res->flags & IORESOURCE_MEM)
241	root = &iomem_resource;
242	else if (res->flags & IORESOURCE_IO)
243	root = &ioport_resource;
42887b29	244	else
4723d0f2 BH	245	continue;
	246
	247	conflict = insert_resource_conflict(root, res);
	248	if (conflict)
	249	dev_err(&info->bridge->dev,
	250	"address space collision: host bridge window %pR "
	251	"conflicts with %s %pR\n",
	252	res, conflict->name, conflict);
	253	else
	254	pci_bus_add_resource(info->bus, res, 0);
62f420f8	255	}
62f420f8 GH	256	}
62f420f8 GH	257
62f420f8 GH	258	static void
62f420f8 GH	259	get_current_resources(struct acpi_device *device, int busnum,
cb3576fa	260	int domain, struct pci_bus *bus)
62f420f8 GH	261	{
	262	struct pci_root_info info;
	263	size_t size;
	264
7bc5e3f2	265	if (pci_use_crs)
2fe2abf8	266	pci_bus_remove_resources(bus);
f1db6fde	267
42887b29	268	info.bridge = device;
62f420f8 GH	269	info.bus = bus;
	270	info.res_num = 0;
	271	acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
	272	&info);
	273	if (!info.res_num)
	274	return;
	275
	276	size = sizeof(info.res) info.res_num;
	277	info.res = kmalloc(size, GFP_KERNEL);
	278	if (!info.res)
	279	goto res_alloc_fail;
	280
b46fc5f2	281	info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
62f420f8 GH	282	if (!info.name)
62f420f8 GH	283	goto name_alloc_fail;
62f420f8 GH	284
	285	info.res_num = 0;
	286	acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
	287	&info);
62f420f8	288
4723d0f2	289	add_resources(&info);
62f420f8 GH	290	return;
	291
	292	name_alloc_fail:
	293	kfree(info.res);
	294	res_alloc_fail:
	295	return;
	296	}
	297
57283776	298	struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
1da177e4	299	{
57283776 BH	300	struct acpi_device *device = root->device;
	301	int domain = root->segment;
	302	int busnum = root->secondary.start;
69e1a33f	303	struct pci_bus *bus;
08f1c192	304	struct pci_sysdata *sd;
871d5f8d YL	305	int node;
871d5f8d YL	306	#ifdef CONFIG_ACPI_NUMA
08f1c192	307	int pxm;
871d5f8d	308	#endif
08f1c192	309
a79e4198	310	if (domain && !pci_domains_supported) {
2a6bed83 BH	311	printk(KERN_WARNING "pci_bus %04x:%02x: "
	312	"ignored (multiple domains not supported)\n",
	313	domain, busnum);
a79e4198 JG	314	return NULL;
	315	}
	316
871d5f8d YL	317	node = -1;
	318	#ifdef CONFIG_ACPI_NUMA
	319	pxm = acpi_get_pxm(device->handle);
	320	if (pxm >= 0)
	321	node = pxm_to_node(pxm);
	322	if (node != -1)
	323	set_mp_bus_to_node(busnum, node);
	324	else
871d5f8d	325	#endif
871d5f8d	326	node = get_mp_bus_to_node(busnum);
b755de8d YL	327
	328	if (node != -1 && !node_online(node))
	329	node = -1;
871d5f8d	330
08f1c192 MBY	331	/* Allocate per-root-bus (not per bus) arch-specific data.
	332	* TODO: leak; this memory is never freed.
	333	* It's arguable whether it's worth the trouble to care.
	334	*/
	335	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
	336	if (!sd) {
2a6bed83 BH	337	printk(KERN_WARNING "pci_bus %04x:%02x: "
2a6bed83 BH	338	"ignored (out of memory)\n", domain, busnum);
08f1c192 MBY	339	return NULL;
08f1c192 MBY	340	}
69e1a33f	341
a79e4198	342	sd->domain = domain;
871d5f8d	343	sd->node = node;
b87e81e5	344	/*
	345	* Maybe the desired pci bus has been already scanned. In such case
	346	* it is unnecessary to scan the pci bus with the given domain,busnum.
	347	*/
	348	bus = pci_find_bus(domain, busnum);
	349	if (bus) {
	350	/*
	351	* If the desired bus exits, the content of bus->sysdata will
	352	* be replaced by sd.
	353	*/
	354	memcpy(bus->sysdata, sd, sizeof(*sd));
	355	kfree(sd);
626fdfec YL	356	} else {
	357	bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
	358	if (bus) {
f1db6fde	359	get_current_resources(device, busnum, domain, bus);
626fdfec YL	360	bus->subordinate = pci_scan_child_bus(bus);
	361	}
	362	}
08f1c192	363
08f1c192 MBY	364	if (!bus)
	365	kfree(sd);
	366
dbb6152e	367	if (bus && node != -1) {
69e1a33f	368	#ifdef CONFIG_ACPI_NUMA
dbb6152e	369	if (pxm >= 0)
2b8c2efe BH	370	dev_printk(KERN_DEBUG, &bus->dev,
2b8c2efe BH	371	"on NUMA node %d (pxm %d)\n", node, pxm);
dbb6152e	372	#else
2b8c2efe	373	dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
69e1a33f	374	#endif
dbb6152e	375	}
62f420f8	376
69e1a33f	377	return bus;
1da177e4 LT	378	}
1da177e4 LT	379
8dd779b1	380	int __init pci_acpi_init(void)
1da177e4 LT	381	{
	382	struct pci_dev *dev = NULL;
	383
1da177e4	384	if (acpi_noirq)
b72d0db9	385	return -ENODEV;
1da177e4 LT	386
	387	printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
	388	acpi_irq_penalty_init();
1da177e4	389	pcibios_enable_irq = acpi_pci_irq_enable;
87bec66b	390	pcibios_disable_irq = acpi_pci_irq_disable;
ab3b3793	391	x86_init.pci.init_irq = x86_init_noop;
1da177e4 LT	392
	393	if (pci_routeirq) {
	394	/*
	395	* PCI IRQ routing is set up by pci_enable_device(), but we
	396	* also do it here in case there are still broken drivers that
	397	* don't use pci_enable_device().
	398	*/
	399	printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
fb37fb96	400	for_each_pci_dev(dev)
1da177e4	401	acpi_pci_irq_enable(dev);
657472e9	402	}
1da177e4	403
1da177e4 LT	404	return 0;
1da177e4 LT	405	}