[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) &&
	    lapic->processor_id == acpi_id) {
		*apic_id = lapic->id;
		return 1;
	}
	return 0;
}

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;
	u32 tmp = apic->local_apic_id;

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

	/* Device statement declaration type */
	if (device_declaration) {
		if (apic->uid == acpi_id)
			goto found;
	}

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

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 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;
}

static int early_pdc_done;

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

	if (arch_has_acpi_pdc() == false)
		return;

	if (early_pdc_done)
		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 int early_pdc_optin;
static int set_early_pdc_optin(const struct dmi_system_id *id)
{
	early_pdc_optin = 1;
	return 0;
}

static int param_early_pdc_optin(char *s)
{
	early_pdc_optin = 1;
	return 1;
}
__setup("acpi_early_pdc_eval", param_early_pdc_optin);

static struct dmi_system_id __cpuinitdata early_pdc_optin_table[] = {
	{
	set_early_pdc_optin, "HP Envy", {
	DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
	DMI_MATCH(DMI_PRODUCT_NAME, "HP Envy") }, NULL},
	{
	set_early_pdc_optin, "HP Pavilion dv6", {
	DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
	DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv6") }, NULL},
	{
	set_early_pdc_optin, "HP Pavilion dv7", {
	DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
	DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv7") }, NULL},
	{},
};

static acpi_status
early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	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);

	/*
	 * Allow systems to opt-in to early _PDC evaluation.
	 */
	dmi_check_system(early_pdc_optin_table);
	if (!early_pdc_optin)
		return;

	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
			    ACPI_UINT32_MAX,
			    early_init_pdc, NULL, NULL, NULL);

	early_pdc_done = 1;
}
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;
	53	if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
	54	lapic->processor_id == acpi_id) {
	55	*apic_id = lapic->id;
	56	return 1;
	57	}
	58	return 0;
	59	}
	60
	61	static int map_x2apic_id(struct acpi_subtable_header *entry,
	62	int device_declaration, u32 acpi_id, int *apic_id)
	63	{
	64	struct acpi_madt_local_x2apic *apic =
	65	(struct acpi_madt_local_x2apic *)entry;
	66	u32 tmp = apic->local_apic_id;
	67
	68	/* Only check enabled APICs*/
	69	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
	70	return 0;
	71
	72	/* Device statement declaration type */
	73	if (device_declaration) {
	74	if (apic->uid == acpi_id)
	75	goto found;
	76	}
	77
	78	return 0;
	79	found:
	80	*apic_id = tmp;
	81	return 1;
	82	}
	83
	84	static int map_lsapic_id(struct acpi_subtable_header *entry,
	85	int device_declaration, u32 acpi_id, int *apic_id)
	86	{
	87	struct acpi_madt_local_sapic *lsapic =
	88	(struct acpi_madt_local_sapic *)entry;
	89	u32 tmp = (lsapic->id << 8) \| lsapic->eid;
	90
	91	/* Only check enabled APICs*/
	92	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
	93	return 0;
	94
	95	/* Device statement declaration type */
	96	if (device_declaration) {
	97	if (entry->length < 16)
	98	printk(KERN_ERR PREFIX
	99	"Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
	100	tmp);
	101	else if (lsapic->uid == acpi_id)
	102	goto found;
	103	/* Processor statement declaration type */
	104	} else if (lsapic->processor_id == acpi_id)
	105	goto found;
	106
	107	return 0;
	108	found:
109	*apic_id = tmp;
110	return 1;
111	}
112
113	static int map_madt_entry(int type, u32 acpi_id)
114	{
115	unsigned long madt_end, entry;
116	int apic_id = -1;
117
118	if (!madt)
119	return apic_id;
120
121	entry = (unsigned long)madt;
122	madt_end = entry + madt->header.length;
123
124	/* Parse all entries looking for a match. */
125
126	entry += sizeof(struct acpi_table_madt);
127	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
128	struct acpi_subtable_header *header =
129	(struct acpi_subtable_header *)entry;
130	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
131	if (map_lapic_id(header, acpi_id, &apic_id))
132	break;
133	} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
134	if (map_x2apic_id(header, type, acpi_id, &apic_id))
135	break;
136	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
137	if (map_lsapic_id(header, type, acpi_id, &apic_id))
138	break;
139	}
140	entry += header->length;
141	}
142	return apic_id;
143	}
144
145	static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
146	{
147	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
148	union acpi_object *obj;
149	struct acpi_subtable_header *header;
150	int apic_id = -1;
151
152	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
153	goto exit;
154
155	if (!buffer.length \|\| !buffer.pointer)
156	goto exit;
157
158	obj = buffer.pointer;
159	if (obj->type != ACPI_TYPE_BUFFER \|\|
160	obj->buffer.length < sizeof(struct acpi_subtable_header)) {
161	goto exit;
162	}
163
164	header = (struct acpi_subtable_header *)obj->buffer.pointer;
165	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
166	map_lapic_id(header, acpi_id, &apic_id);
167	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
168	map_lsapic_id(header, type, acpi_id, &apic_id);
169	}
170
171	exit:
172	if (buffer.pointer)
173	kfree(buffer.pointer);
174	return apic_id;
175	}
176
177	int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
178	{
179	int i;
180	int apic_id = -1;
181
182	apic_id = map_mat_entry(handle, type, acpi_id);
183	if (apic_id == -1)
184	apic_id = map_madt_entry(type, acpi_id);
185	if (apic_id == -1)
186	return apic_id;
187
188	for_each_possible_cpu(i) {
189	if (cpu_physical_id(i) == apic_id)
190	return i;
191	}
192	return -1;
193	}
194	EXPORT_SYMBOL_GPL(acpi_get_cpuid);
195	#endif
196
197
08ea48a3 AC	198	static void acpi_set_pdc_bits(u32 *buf)
	199	{
	200	buf[0] = ACPI_PDC_REVISION_ID;
	201	buf[1] = 1;
	202
	203	/* Enable coordination with firmware's _TSD info */
	204	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
6c5807d7 AC	205
	206	/* Twiddle arch-specific bits needed for _PDC */
	207	arch_acpi_set_pdc_bits(buf);
08ea48a3 AC	208	}
08ea48a3 AC	209
3b407aef	210	static struct acpi_object_list *acpi_processor_alloc_pdc(void)
407cd87c AC	211	{
	212	struct acpi_object_list *obj_list;
	213	union acpi_object *obj;
	214	u32 *buf;
	215
407cd87c AC	216	/* allocate and initialize pdc. It will be used later. */
	217	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	218	if (!obj_list) {
	219	printk(KERN_ERR "Memory allocation error\n");
3b407aef	220	return NULL;
407cd87c AC	221	}
	222
	223	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	224	if (!obj) {
	225	printk(KERN_ERR "Memory allocation error\n");
	226	kfree(obj_list);
3b407aef	227	return NULL;
407cd87c AC	228	}
	229
	230	buf = kmalloc(12, GFP_KERNEL);
	231	if (!buf) {
	232	printk(KERN_ERR "Memory allocation error\n");
	233	kfree(obj);
	234	kfree(obj_list);
3b407aef	235	return NULL;
407cd87c AC	236	}
407cd87c AC	237
08ea48a3 AC	238	acpi_set_pdc_bits(buf);
08ea48a3 AC	239
407cd87c AC	240	obj->type = ACPI_TYPE_BUFFER;
	241	obj->buffer.length = 12;
	242	obj->buffer.pointer = (u8 *) buf;
	243	obj_list->count = 1;
	244	obj_list->pointer = obj;
407cd87c	245
3b407aef	246	return obj_list;
407cd87c AC	247	}
407cd87c AC	248
78f16996 AC	249	/*
	250	* _PDC is required for a BIOS-OS handshake for most of the newer
	251	* ACPI processor features.
	252	*/
fa118564 AC	253	static int
fa118564 AC	254	acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
78f16996	255	{
78f16996 AC	256	acpi_status status = AE_OK;
78f16996 AC	257
78f16996 AC	258	if (idle_nomwait) {
	259	/*
	260	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	261	* mode will be disabled in the parameter of _PDC object.
	262	* Of course C1_FFH access mode will also be disabled.
	263	*/
	264	union acpi_object *obj;
	265	u32 *buffer = NULL;
	266
	267	obj = pdc_in->pointer;
	268	buffer = (u32 *)(obj->buffer.pointer);
	269	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	270
	271	}
fa118564	272	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
78f16996 AC	273
	274	if (ACPI_FAILURE(status))
	275	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	276	"Could not evaluate _PDC, using legacy perf. control.\n"));
	277
	278	return status;
	279	}
	280
a4932299 AC	281	static int early_pdc_done;
a4932299 AC	282
43bab25c	283	void acpi_processor_set_pdc(acpi_handle handle)
78f16996	284	{
3b407aef AC	285	struct acpi_object_list *obj_list;
3b407aef AC	286
1d9cb470 AC	287	if (arch_has_acpi_pdc() == false)
	288	return;
	289
a4932299 AC	290	if (early_pdc_done)
	291	return;
	292
3b407aef AC	293	obj_list = acpi_processor_alloc_pdc();
	294	if (!obj_list)
	295	return;
	296
43bab25c	297	acpi_processor_eval_pdc(handle, obj_list);
b9c2db78 AC	298
	299	kfree(obj_list->pointer->buffer.pointer);
	300	kfree(obj_list->pointer);
	301	kfree(obj_list);
78f16996 AC	302	}
	303	EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
	304
2205cbe8 AC	305	static int early_pdc_optin;
	306	static int set_early_pdc_optin(const struct dmi_system_id *id)
	307	{
	308	early_pdc_optin = 1;
	309	return 0;
	310	}
	311
0406ad33 AC	312	static int param_early_pdc_optin(char *s)
	313	{
	314	early_pdc_optin = 1;
	315	return 1;
	316	}
	317	__setup("acpi_early_pdc_eval", param_early_pdc_optin);
	318
2205cbe8 AC	319	static struct dmi_system_id __cpuinitdata early_pdc_optin_table[] = {
	320	{
	321	set_early_pdc_optin, "HP Envy", {
	322	DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
	323	DMI_MATCH(DMI_PRODUCT_NAME, "HP Envy") }, NULL},
	324	{
	325	set_early_pdc_optin, "HP Pavilion dv6", {
	326	DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
	327	DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv6") }, NULL},
	328	{
	329	set_early_pdc_optin, "HP Pavilion dv7", {
	330	DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
	331	DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv7") }, NULL},
	332	{},
	333	};
	334
78f16996 AC	335	static acpi_status
	336	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
	337	{
43bab25c	338	acpi_processor_set_pdc(handle);
78f16996 AC	339	return AE_OK;
	340	}
	341
7a0b73a4	342	void __init acpi_early_processor_set_pdc(void)
78f16996	343	{
78ed8bd2 AC	344
	345	#ifdef CONFIG_SMP
	346	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
	347	(struct acpi_table_header **)&madt)))
	348	madt = NULL;
	349	#endif
	350
78f16996 AC	351	/*
	352	* Check whether the system is DMI table. If yes, OSPM
	353	* should not use mwait for CPU-states.
	354	*/
	355	dmi_check_system(processor_idle_dmi_table);
	356
2205cbe8 AC	357	/*
	358	* Allow systems to opt-in to early _PDC evaluation.
	359	*/
	360	dmi_check_system(early_pdc_optin_table);
	361	if (!early_pdc_optin)
	362	return;
	363
78f16996 AC	364	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	365	ACPI_UINT32_MAX,
	366	early_init_pdc, NULL, NULL, NULL);
a4932299 AC	367
a4932299 AC	368	early_pdc_done = 1;
78f16996	369	}