[net-next-2.6.git] / drivers / acpi / processor_core.c

/*
 * Copyright (C) 2005 Intel Corporation
 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
 *
 *	Alex Chiang <achiang@hp.com>
 *	- Unified x86/ia64 implementations
 *	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
 *	- Added _PDC for platforms with Intel CPUs
 */
#include <linux/dmi.h>

#include <acpi/acpi_drivers.h>
#include <acpi/processor.h>

#include "internal.h"

#define PREFIX			"ACPI: "
#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_core");

static int set_no_mwait(const struct dmi_system_id *id)
{
	printk(KERN_NOTICE PREFIX "%s detected - "
		"disabling mwait for CPU C-states\n", id->ident);
	idle_nomwait = 1;
	return 0;
}

static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
	{
	set_no_mwait, "IFL91 board", {
	DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
	DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
	DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
	DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
	{
	set_no_mwait, "Extensa 5220", {
	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
	{},
};

#ifdef CONFIG_SMP
static struct acpi_table_madt *madt;

static int map_lapic_id(struct acpi_subtable_header *entry,
		 u32 acpi_id, int *apic_id)
{
	struct acpi_madt_local_apic *lapic =
		(struct acpi_madt_local_apic *)entry;

	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
		return 0;

	if (lapic->processor_id != acpi_id)
		return 0;

	*apic_id = lapic->id;
	return 1;
}

static int map_x2apic_id(struct acpi_subtable_header *entry,
			 int device_declaration, u32 acpi_id, int *apic_id)
{
	struct acpi_madt_local_x2apic *apic =
		(struct acpi_madt_local_x2apic *)entry;

	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
		return 0;

	if (device_declaration && (apic->uid == acpi_id)) {
		*apic_id = apic->local_apic_id;
		return 1;
	}

	return 0;
}

static int map_lsapic_id(struct acpi_subtable_header *entry,
		int device_declaration, u32 acpi_id, int *apic_id)
{
	struct acpi_madt_local_sapic *lsapic =
		(struct acpi_madt_local_sapic *)entry;
	u32 tmp = (lsapic->id << 8) | lsapic->eid;

	/* Only check enabled APICs*/
	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
		return 0;

	/* Device statement declaration type */
	if (device_declaration) {
		if (entry->length < 16)
			printk(KERN_ERR PREFIX
			    "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
			    tmp);
		else if (lsapic->uid == acpi_id)
			goto found;
	/* Processor statement declaration type */
	} else if (lsapic->processor_id == acpi_id)
		goto found;

	return 0;
found:
	*apic_id = tmp;
	return 1;
}

static int map_madt_entry(int type, u32 acpi_id)
{
	unsigned long madt_end, entry;
	int apic_id = -1;

	if (!madt)
		return apic_id;

	entry = (unsigned long)madt;
	madt_end = entry + madt->header.length;

	/* Parse all entries looking for a match. */

	entry += sizeof(struct acpi_table_madt);
	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
		struct acpi_subtable_header *header =
			(struct acpi_subtable_header *)entry;
		if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
			if (map_lapic_id(header, acpi_id, &apic_id))
				break;
		} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
			if (map_x2apic_id(header, type, acpi_id, &apic_id))
				break;
		} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
			if (map_lsapic_id(header, type, acpi_id, &apic_id))
				break;
		}
		entry += header->length;
	}
	return apic_id;
}

static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
	struct acpi_subtable_header *header;
	int apic_id = -1;

	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
		goto exit;

	if (!buffer.length || !buffer.pointer)
		goto exit;

	obj = buffer.pointer;
	if (obj->type != ACPI_TYPE_BUFFER ||
	    obj->buffer.length < sizeof(struct acpi_subtable_header)) {
		goto exit;
	}

	header = (struct acpi_subtable_header *)obj->buffer.pointer;
	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
		map_lapic_id(header, acpi_id, &apic_id);
	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
		map_lsapic_id(header, type, acpi_id, &apic_id);
	}

exit:
	if (buffer.pointer)
		kfree(buffer.pointer);
	return apic_id;
}

int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
	int i;
	int apic_id = -1;

	apic_id = map_mat_entry(handle, type, acpi_id);
	if (apic_id == -1)
		apic_id = map_madt_entry(type, acpi_id);
	if (apic_id == -1)
		return apic_id;

	for_each_possible_cpu(i) {
		if (cpu_physical_id(i) == apic_id)
			return i;
	}
	return -1;
}
EXPORT_SYMBOL_GPL(acpi_get_cpuid);
#endif

static bool processor_physically_present(acpi_handle handle)
{
	int cpuid, type;
	u32 acpi_id;
	acpi_status status;
	acpi_object_type acpi_type;
	unsigned long long tmp;
	union acpi_object object = { 0 };
	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };

	status = acpi_get_type(handle, &acpi_type);
	if (ACPI_FAILURE(status))
		return false;

	switch (acpi_type) {
	case ACPI_TYPE_PROCESSOR:
		status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
		if (ACPI_FAILURE(status))
			return false;
		acpi_id = object.processor.proc_id;
		break;
	case ACPI_TYPE_DEVICE:
		status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
		if (ACPI_FAILURE(status))
			return false;
		acpi_id = tmp;
		break;
	default:
		return false;
	}

	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
	cpuid = acpi_get_cpuid(handle, type, acpi_id);

	if (cpuid == -1)
		return false;

	return true;
}

static void acpi_set_pdc_bits(u32 *buf)
{
	buf[0] = ACPI_PDC_REVISION_ID;
	buf[1] = 1;

	/* Enable coordination with firmware's _TSD info */
	buf[2] = ACPI_PDC_SMP_T_SWCOORD;

	/* Twiddle arch-specific bits needed for _PDC */
	arch_acpi_set_pdc_bits(buf);
}

static struct acpi_object_list *acpi_processor_alloc_pdc(void)
{
	struct acpi_object_list *obj_list;
	union acpi_object *obj;
	u32 *buf;

	/* allocate and initialize pdc. It will be used later. */
	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	if (!obj_list) {
		printk(KERN_ERR "Memory allocation error\n");
		return NULL;
	}

	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	if (!obj) {
		printk(KERN_ERR "Memory allocation error\n");
		kfree(obj_list);
		return NULL;
	}

	buf = kmalloc(12, GFP_KERNEL);
	if (!buf) {
		printk(KERN_ERR "Memory allocation error\n");
		kfree(obj);
		kfree(obj_list);
		return NULL;
	}

	acpi_set_pdc_bits(buf);

	obj->type = ACPI_TYPE_BUFFER;
	obj->buffer.length = 12;
	obj->buffer.pointer = (u8 *) buf;
	obj_list->count = 1;
	obj_list->pointer = obj;

	return obj_list;
}

/*
 * _PDC is required for a BIOS-OS handshake for most of the newer
 * ACPI processor features.
 */
static int
acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
{
	acpi_status status = AE_OK;

	if (idle_nomwait) {
		/*
		 * If mwait is disabled for CPU C-states, the C2C3_FFH access
		 * mode will be disabled in the parameter of _PDC object.
		 * Of course C1_FFH access mode will also be disabled.
		 */
		union acpi_object *obj;
		u32 *buffer = NULL;

		obj = pdc_in->pointer;
		buffer = (u32 *)(obj->buffer.pointer);
		buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);

	}
	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);

	if (ACPI_FAILURE(status))
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
		    "Could not evaluate _PDC, using legacy perf. control.\n"));

	return status;
}

void acpi_processor_set_pdc(acpi_handle handle)
{
	struct acpi_object_list *obj_list;

	if (arch_has_acpi_pdc() == false)
		return;

	obj_list = acpi_processor_alloc_pdc();
	if (!obj_list)
		return;

	acpi_processor_eval_pdc(handle, obj_list);

	kfree(obj_list->pointer->buffer.pointer);
	kfree(obj_list->pointer);
	kfree(obj_list);
}
EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);

static acpi_status
early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	if (processor_physically_present(handle) == false)
		return AE_OK;

	acpi_processor_set_pdc(handle);
	return AE_OK;
}

void __init acpi_early_processor_set_pdc(void)
{

#ifdef CONFIG_SMP
	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
				(struct acpi_table_header **)&madt)))
		madt = NULL;
#endif

	/*
	 * Check whether the system is DMI table. If yes, OSPM
	 * should not use mwait for CPU-states.
	 */
	dmi_check_system(processor_idle_dmi_table);

	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
			    ACPI_UINT32_MAX,
			    early_init_pdc, NULL, NULL, NULL);
}
Commit	Line	Data
47817254 AC	1	/*
	2	* Copyright (C) 2005 Intel Corporation
	3	* Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
	4	*
	5	* Alex Chiang <achiang@hp.com>
	6	* - Unified x86/ia64 implementations
	7	* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
	8	* - Added _PDC for platforms with Intel CPUs
	9	*/
78f16996 AC	10	#include <linux/dmi.h>
	11
	12	#include <acpi/acpi_drivers.h>
	13	#include <acpi/processor.h>
	14
	15	#include "internal.h"
	16
	17	#define PREFIX "ACPI: "
	18	#define _COMPONENT ACPI_PROCESSOR_COMPONENT
4d5d4cd8	19	ACPI_MODULE_NAME("processor_core");
78f16996 AC	20
	21	static int set_no_mwait(const struct dmi_system_id *id)
	22	{
	23	printk(KERN_NOTICE PREFIX "%s detected - "
	24	"disabling mwait for CPU C-states\n", id->ident);
	25	idle_nomwait = 1;
	26	return 0;
	27	}
	28
	29	static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
	30	{
	31	set_no_mwait, "IFL91 board", {
	32	DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
	33	DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
	34	DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
	35	DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
	36	{
	37	set_no_mwait, "Extensa 5220", {
	38	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
	39	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	40	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
	41	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
	42	{},
	43	};
	44
78ed8bd2 AC	45	#ifdef CONFIG_SMP
	46	static struct acpi_table_madt *madt;
	47
	48	static int map_lapic_id(struct acpi_subtable_header *entry,
	49	u32 acpi_id, int *apic_id)
	50	{
	51	struct acpi_madt_local_apic *lapic =
	52	(struct acpi_madt_local_apic *)entry;
11130736 AC	53
	54	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
	55	return 0;
	56
	57	if (lapic->processor_id != acpi_id)
	58	return 0;
	59
	60	*apic_id = lapic->id;
	61	return 1;
78ed8bd2 AC	62	}
	63
	64	static int map_x2apic_id(struct acpi_subtable_header *entry,
	65	int device_declaration, u32 acpi_id, int *apic_id)
	66	{
	67	struct acpi_madt_local_x2apic *apic =
	68	(struct acpi_madt_local_x2apic *)entry;
78ed8bd2	69
78ed8bd2 AC	70	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
	71	return 0;
	72
d6742095 AC	73	if (device_declaration && (apic->uid == acpi_id)) {
	74	*apic_id = apic->local_apic_id;
	75	return 1;
78ed8bd2 AC	76	}
	77
	78	return 0;
78ed8bd2 AC	79	}
	80
	81	static int map_lsapic_id(struct acpi_subtable_header *entry,
	82	int device_declaration, u32 acpi_id, int *apic_id)
	83	{
	84	struct acpi_madt_local_sapic *lsapic =
	85	(struct acpi_madt_local_sapic *)entry;
	86	u32 tmp = (lsapic->id << 8) \| lsapic->eid;
	87
	88	/* Only check enabled APICs*/
	89	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
	90	return 0;
	91
	92	/* Device statement declaration type */
	93	if (device_declaration) {
	94	if (entry->length < 16)
	95	printk(KERN_ERR PREFIX
	96	"Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
	97	tmp);
	98	else if (lsapic->uid == acpi_id)
	99	goto found;
	100	/* Processor statement declaration type */
	101	} else if (lsapic->processor_id == acpi_id)
	102	goto found;
	103
	104	return 0;
	105	found:
	106	*apic_id = tmp;
	107	return 1;
	108	}
	109
	110	static int map_madt_entry(int type, u32 acpi_id)
	111	{
	112	unsigned long madt_end, entry;
	113	int apic_id = -1;
	114
	115	if (!madt)
	116	return apic_id;
	117
	118	entry = (unsigned long)madt;
	119	madt_end = entry + madt->header.length;
	120
	121	/* Parse all entries looking for a match. */
	122
	123	entry += sizeof(struct acpi_table_madt);
	124	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
	125	struct acpi_subtable_header *header =
	126	(struct acpi_subtable_header *)entry;
	127	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
	128	if (map_lapic_id(header, acpi_id, &apic_id))
	129	break;
	130	} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
	131	if (map_x2apic_id(header, type, acpi_id, &apic_id))
	132	break;
	133	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
	134	if (map_lsapic_id(header, type, acpi_id, &apic_id))
	135	break;
	136	}
	137	entry += header->length;
	138	}
	139	return apic_id;
	140	}
	141
	142	static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
143	{
144	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
145	union acpi_object *obj;
146	struct acpi_subtable_header *header;
147	int apic_id = -1;
148
149	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
150	goto exit;
151
152	if (!buffer.length \|\| !buffer.pointer)
153	goto exit;
154
155	obj = buffer.pointer;
156	if (obj->type != ACPI_TYPE_BUFFER \|\|
157	obj->buffer.length < sizeof(struct acpi_subtable_header)) {
158	goto exit;
159	}
160
161	header = (struct acpi_subtable_header *)obj->buffer.pointer;
162	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
163	map_lapic_id(header, acpi_id, &apic_id);
164	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
165	map_lsapic_id(header, type, acpi_id, &apic_id);
166	}
167
168	exit:
169	if (buffer.pointer)
170	kfree(buffer.pointer);
171	return apic_id;
172	}
173
174	int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
175	{
176	int i;
177	int apic_id = -1;
178
179	apic_id = map_mat_entry(handle, type, acpi_id);
180	if (apic_id == -1)
181	apic_id = map_madt_entry(type, acpi_id);
182	if (apic_id == -1)
183	return apic_id;
184
185	for_each_possible_cpu(i) {
186	if (cpu_physical_id(i) == apic_id)
187	return i;
188	}
189	return -1;
190	}
191	EXPORT_SYMBOL_GPL(acpi_get_cpuid);
192	#endif
193
5d554a7b AC	194	static bool processor_physically_present(acpi_handle handle)
	195	{
	196	int cpuid, type;
	197	u32 acpi_id;
	198	acpi_status status;
	199	acpi_object_type acpi_type;
	200	unsigned long long tmp;
	201	union acpi_object object = { 0 };
	202	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
	203
	204	status = acpi_get_type(handle, &acpi_type);
	205	if (ACPI_FAILURE(status))
	206	return false;
	207
	208	switch (acpi_type) {
	209	case ACPI_TYPE_PROCESSOR:
	210	status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
	211	if (ACPI_FAILURE(status))
	212	return false;
	213	acpi_id = object.processor.proc_id;
	214	break;
	215	case ACPI_TYPE_DEVICE:
	216	status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
	217	if (ACPI_FAILURE(status))
	218	return false;
	219	acpi_id = tmp;
	220	break;
	221	default:
	222	return false;
	223	}
	224
	225	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
	226	cpuid = acpi_get_cpuid(handle, type, acpi_id);
	227
	228	if (cpuid == -1)
	229	return false;
	230
	231	return true;
	232	}
78ed8bd2	233
08ea48a3 AC	234	static void acpi_set_pdc_bits(u32 *buf)
	235	{
	236	buf[0] = ACPI_PDC_REVISION_ID;
	237	buf[1] = 1;
	238
	239	/* Enable coordination with firmware's _TSD info */
	240	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
6c5807d7 AC	241
	242	/* Twiddle arch-specific bits needed for _PDC */
	243	arch_acpi_set_pdc_bits(buf);
08ea48a3 AC	244	}
08ea48a3 AC	245
3b407aef	246	static struct acpi_object_list *acpi_processor_alloc_pdc(void)
407cd87c AC	247	{
	248	struct acpi_object_list *obj_list;
	249	union acpi_object *obj;
	250	u32 *buf;
	251
407cd87c AC	252	/* allocate and initialize pdc. It will be used later. */
	253	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	254	if (!obj_list) {
	255	printk(KERN_ERR "Memory allocation error\n");
3b407aef	256	return NULL;
407cd87c AC	257	}
	258
	259	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	260	if (!obj) {
	261	printk(KERN_ERR "Memory allocation error\n");
	262	kfree(obj_list);
3b407aef	263	return NULL;
407cd87c AC	264	}
	265
	266	buf = kmalloc(12, GFP_KERNEL);
	267	if (!buf) {
	268	printk(KERN_ERR "Memory allocation error\n");
	269	kfree(obj);
	270	kfree(obj_list);
3b407aef	271	return NULL;
407cd87c AC	272	}
407cd87c AC	273
08ea48a3 AC	274	acpi_set_pdc_bits(buf);
08ea48a3 AC	275
407cd87c AC	276	obj->type = ACPI_TYPE_BUFFER;
	277	obj->buffer.length = 12;
	278	obj->buffer.pointer = (u8 *) buf;
	279	obj_list->count = 1;
	280	obj_list->pointer = obj;
407cd87c	281
3b407aef	282	return obj_list;
407cd87c AC	283	}
407cd87c AC	284
78f16996 AC	285	/*
	286	* _PDC is required for a BIOS-OS handshake for most of the newer
	287	* ACPI processor features.
	288	*/
fa118564 AC	289	static int
fa118564 AC	290	acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
78f16996	291	{
78f16996 AC	292	acpi_status status = AE_OK;
78f16996 AC	293
78f16996 AC	294	if (idle_nomwait) {
	295	/*
	296	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	297	* mode will be disabled in the parameter of _PDC object.
	298	* Of course C1_FFH access mode will also be disabled.
	299	*/
	300	union acpi_object *obj;
	301	u32 *buffer = NULL;
	302
	303	obj = pdc_in->pointer;
	304	buffer = (u32 *)(obj->buffer.pointer);
	305	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	306
	307	}
fa118564	308	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
78f16996 AC	309
	310	if (ACPI_FAILURE(status))
	311	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	312	"Could not evaluate _PDC, using legacy perf. control.\n"));
	313
	314	return status;
	315	}
	316
43bab25c	317	void acpi_processor_set_pdc(acpi_handle handle)
78f16996	318	{
3b407aef AC	319	struct acpi_object_list *obj_list;
3b407aef AC	320
1d9cb470 AC	321	if (arch_has_acpi_pdc() == false)
	322	return;
	323
3b407aef AC	324	obj_list = acpi_processor_alloc_pdc();
	325	if (!obj_list)
	326	return;
	327
43bab25c	328	acpi_processor_eval_pdc(handle, obj_list);
b9c2db78 AC	329
	330	kfree(obj_list->pointer->buffer.pointer);
	331	kfree(obj_list->pointer);
	332	kfree(obj_list);
78f16996 AC	333	}
	334	EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
	335
	336	static acpi_status
	337	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
	338	{
5d554a7b AC	339	if (processor_physically_present(handle) == false)
	340	return AE_OK;
	341
43bab25c	342	acpi_processor_set_pdc(handle);
78f16996 AC	343	return AE_OK;
	344	}
	345
7a0b73a4	346	void __init acpi_early_processor_set_pdc(void)
78f16996	347	{
78ed8bd2 AC	348
	349	#ifdef CONFIG_SMP
	350	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
	351	(struct acpi_table_header **)&madt)))
	352	madt = NULL;
	353	#endif
	354
78f16996 AC	355	/*
	356	* Check whether the system is DMI table. If yes, OSPM
	357	* should not use mwait for CPU-states.
	358	*/
	359	dmi_check_system(processor_idle_dmi_table);
	360
	361	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	362	ACPI_UINT32_MAX,
	363	early_init_pdc, NULL, NULL, NULL);
	364	}