[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 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;

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

	if (device_declaration) {
		if ((entry->length < 16) || (lsapic->uid != acpi_id))
			return 0;
	} else if (lsapic->processor_id != acpi_id)
		return 0;

	*apic_id = (lsapic->id << 8) | lsapic->eid;
	return 1;
}

static int map_madt_entry(int type, u32 acpi_id)
{
	unsigned long madt_end, entry;
	static struct acpi_table_madt *madt;
	static int read_madt;
	int apic_id = -1;

	if (!read_madt) {
		if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
					(struct acpi_table_header **)&madt)))
			madt = NULL;
		read_madt++;
	}

	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)
{
	/*
	 * 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	45	#ifdef CONFIG_SMP
78ed8bd2 AC	46	static int map_lapic_id(struct acpi_subtable_header *entry,
	47	u32 acpi_id, int *apic_id)
	48	{
	49	struct acpi_madt_local_apic *lapic =
	50	(struct acpi_madt_local_apic *)entry;
11130736 AC	51
	52	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
	53	return 0;
	54
	55	if (lapic->processor_id != acpi_id)
	56	return 0;
	57
	58	*apic_id = lapic->id;
	59	return 1;
78ed8bd2 AC	60	}
	61
	62	static int map_x2apic_id(struct acpi_subtable_header *entry,
	63	int device_declaration, u32 acpi_id, int *apic_id)
	64	{
	65	struct acpi_madt_local_x2apic *apic =
	66	(struct acpi_madt_local_x2apic *)entry;
78ed8bd2	67
78ed8bd2 AC	68	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
	69	return 0;
	70
d6742095 AC	71	if (device_declaration && (apic->uid == acpi_id)) {
	72	*apic_id = apic->local_apic_id;
	73	return 1;
78ed8bd2 AC	74	}
	75
	76	return 0;
78ed8bd2 AC	77	}
	78
	79	static int map_lsapic_id(struct acpi_subtable_header *entry,
	80	int device_declaration, u32 acpi_id, int *apic_id)
	81	{
	82	struct acpi_madt_local_sapic *lsapic =
	83	(struct acpi_madt_local_sapic *)entry;
78ed8bd2	84
78ed8bd2 AC	85	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
	86	return 0;
	87
78ed8bd2	88	if (device_declaration) {
eae701ce AC	89	if ((entry->length < 16) \|\| (lsapic->uid != acpi_id))
	90	return 0;
	91	} else if (lsapic->processor_id != acpi_id)
	92	return 0;
78ed8bd2	93
eae701ce	94	*apic_id = (lsapic->id << 8) \| lsapic->eid;
78ed8bd2 AC	95	return 1;
	96	}
	97
	98	static int map_madt_entry(int type, u32 acpi_id)
	99	{
	100	unsigned long madt_end, entry;
149fe9c2 AC	101	static struct acpi_table_madt *madt;
149fe9c2 AC	102	static int read_madt;
78ed8bd2 AC	103	int apic_id = -1;
78ed8bd2 AC	104
149fe9c2 AC	105	if (!read_madt) {
	106	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
	107	(struct acpi_table_header **)&madt)))
	108	madt = NULL;
	109	read_madt++;
	110	}
	111
78ed8bd2 AC	112	if (!madt)
	113	return apic_id;
	114
	115	entry = (unsigned long)madt;
	116	madt_end = entry + madt->header.length;
	117
	118	/* Parse all entries looking for a match. */
	119
	120	entry += sizeof(struct acpi_table_madt);
	121	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
	122	struct acpi_subtable_header *header =
	123	(struct acpi_subtable_header *)entry;
	124	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
	125	if (map_lapic_id(header, acpi_id, &apic_id))
	126	break;
	127	} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
	128	if (map_x2apic_id(header, type, acpi_id, &apic_id))
	129	break;
	130	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
	131	if (map_lsapic_id(header, type, acpi_id, &apic_id))
	132	break;
	133	}
	134	entry += header->length;
	135	}
	136	return apic_id;
	137	}
	138
	139	static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
	140	{
	141	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	142	union acpi_object *obj;
	143	struct acpi_subtable_header *header;
	144	int apic_id = -1;
	145
	146	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
	147	goto exit;
	148
	149	if (!buffer.length \|\| !buffer.pointer)
	150	goto exit;
	151
	152	obj = buffer.pointer;
	153	if (obj->type != ACPI_TYPE_BUFFER \|\|
	154	obj->buffer.length < sizeof(struct acpi_subtable_header)) {
	155	goto exit;
	156	}
	157
	158	header = (struct acpi_subtable_header *)obj->buffer.pointer;
	159	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
	160	map_lapic_id(header, acpi_id, &apic_id);
	161	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
	162	map_lsapic_id(header, type, acpi_id, &apic_id);
	163	}
	164
	165	exit:
	166	if (buffer.pointer)
	167	kfree(buffer.pointer);
	168	return apic_id;
	169	}
	170
	171	int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
	172	{
	173	int i;
	174	int apic_id = -1;
	175
176	apic_id = map_mat_entry(handle, type, acpi_id);
177	if (apic_id == -1)
178	apic_id = map_madt_entry(type, acpi_id);
179	if (apic_id == -1)
180	return apic_id;
181
182	for_each_possible_cpu(i) {
183	if (cpu_physical_id(i) == apic_id)
184	return i;
185	}
186	return -1;
187	}
188	EXPORT_SYMBOL_GPL(acpi_get_cpuid);
189	#endif
190
5d554a7b AC	191	static bool processor_physically_present(acpi_handle handle)
	192	{
	193	int cpuid, type;
	194	u32 acpi_id;
	195	acpi_status status;
	196	acpi_object_type acpi_type;
	197	unsigned long long tmp;
	198	union acpi_object object = { 0 };
	199	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
	200
	201	status = acpi_get_type(handle, &acpi_type);
	202	if (ACPI_FAILURE(status))
	203	return false;
	204
	205	switch (acpi_type) {
	206	case ACPI_TYPE_PROCESSOR:
	207	status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
	208	if (ACPI_FAILURE(status))
	209	return false;
	210	acpi_id = object.processor.proc_id;
	211	break;
	212	case ACPI_TYPE_DEVICE:
	213	status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
	214	if (ACPI_FAILURE(status))
	215	return false;
	216	acpi_id = tmp;
	217	break;
	218	default:
	219	return false;
	220	}
	221
	222	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
	223	cpuid = acpi_get_cpuid(handle, type, acpi_id);
	224
	225	if (cpuid == -1)
	226	return false;
	227
	228	return true;
	229	}
78ed8bd2	230
08ea48a3 AC	231	static void acpi_set_pdc_bits(u32 *buf)
	232	{
	233	buf[0] = ACPI_PDC_REVISION_ID;
	234	buf[1] = 1;
	235
	236	/* Enable coordination with firmware's _TSD info */
	237	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
6c5807d7 AC	238
	239	/* Twiddle arch-specific bits needed for _PDC */
	240	arch_acpi_set_pdc_bits(buf);
08ea48a3 AC	241	}
08ea48a3 AC	242
3b407aef	243	static struct acpi_object_list *acpi_processor_alloc_pdc(void)
407cd87c AC	244	{
	245	struct acpi_object_list *obj_list;
	246	union acpi_object *obj;
	247	u32 *buf;
	248
407cd87c AC	249	/* allocate and initialize pdc. It will be used later. */
	250	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	251	if (!obj_list) {
	252	printk(KERN_ERR "Memory allocation error\n");
3b407aef	253	return NULL;
407cd87c AC	254	}
	255
	256	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	257	if (!obj) {
	258	printk(KERN_ERR "Memory allocation error\n");
	259	kfree(obj_list);
3b407aef	260	return NULL;
407cd87c AC	261	}
	262
	263	buf = kmalloc(12, GFP_KERNEL);
	264	if (!buf) {
	265	printk(KERN_ERR "Memory allocation error\n");
	266	kfree(obj);
	267	kfree(obj_list);
3b407aef	268	return NULL;
407cd87c AC	269	}
407cd87c AC	270
08ea48a3 AC	271	acpi_set_pdc_bits(buf);
08ea48a3 AC	272
407cd87c AC	273	obj->type = ACPI_TYPE_BUFFER;
	274	obj->buffer.length = 12;
	275	obj->buffer.pointer = (u8 *) buf;
	276	obj_list->count = 1;
	277	obj_list->pointer = obj;
407cd87c	278
3b407aef	279	return obj_list;
407cd87c AC	280	}
407cd87c AC	281
78f16996 AC	282	/*
	283	* _PDC is required for a BIOS-OS handshake for most of the newer
	284	* ACPI processor features.
	285	*/
fa118564 AC	286	static int
fa118564 AC	287	acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
78f16996	288	{
78f16996 AC	289	acpi_status status = AE_OK;
78f16996 AC	290
78f16996 AC	291	if (idle_nomwait) {
	292	/*
	293	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	294	* mode will be disabled in the parameter of _PDC object.
	295	* Of course C1_FFH access mode will also be disabled.
	296	*/
	297	union acpi_object *obj;
	298	u32 *buffer = NULL;
	299
	300	obj = pdc_in->pointer;
	301	buffer = (u32 *)(obj->buffer.pointer);
	302	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	303
	304	}
fa118564	305	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
78f16996 AC	306
	307	if (ACPI_FAILURE(status))
	308	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	309	"Could not evaluate _PDC, using legacy perf. control.\n"));
	310
	311	return status;
	312	}
	313
43bab25c	314	void acpi_processor_set_pdc(acpi_handle handle)
78f16996	315	{
3b407aef AC	316	struct acpi_object_list *obj_list;
3b407aef AC	317
1d9cb470 AC	318	if (arch_has_acpi_pdc() == false)
	319	return;
	320
3b407aef AC	321	obj_list = acpi_processor_alloc_pdc();
	322	if (!obj_list)
	323	return;
	324
43bab25c	325	acpi_processor_eval_pdc(handle, obj_list);
b9c2db78 AC	326
	327	kfree(obj_list->pointer->buffer.pointer);
	328	kfree(obj_list->pointer);
	329	kfree(obj_list);
78f16996 AC	330	}
	331	EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
	332
	333	static acpi_status
	334	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
	335	{
5d554a7b AC	336	if (processor_physically_present(handle) == false)
	337	return AE_OK;
	338
43bab25c	339	acpi_processor_set_pdc(handle);
78f16996 AC	340	return AE_OK;
	341	}
	342
7a0b73a4	343	void __init acpi_early_processor_set_pdc(void)
78f16996 AC	344	{
	345	/*
	346	* Check whether the system is DMI table. If yes, OSPM
	347	* should not use mwait for CPU-states.
	348	*/
	349	dmi_check_system(processor_idle_dmi_table);
	350
	351	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	352	ACPI_UINT32_MAX,
	353	early_init_pdc, NULL, NULL, NULL);
	354	}