[linux-2.6-block.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/export.h>
#include <linux/dmi.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <acpi/processor.h>

#include "internal.h"

#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_core");

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 -ENODEV;

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

	*apic_id = lapic->id;
	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;

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

	if (device_declaration && (apic->uid == acpi_id)) {
		*apic_id = apic->local_apic_id;
		return 0;
	}

	return -EINVAL;
}

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 -ENODEV;

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

	*apic_id = (lsapic->id << 8) | lsapic->eid;
	return 0;
}

static int map_gic_id(struct acpi_subtable_header *entry,
		int device_declaration, u32 acpi_id, int *apic_id)
{
	struct acpi_madt_generic_interrupt *gic =
		(struct acpi_madt_generic_interrupt *)entry;

	if (!(gic->flags & ACPI_MADT_ENABLED))
		return -ENODEV;

	/*
	 * In the GIC interrupt model, logical processors are
	 * required to have a Processor Device object in the DSDT,
	 * so we should check device_declaration here
	 */
	if (device_declaration && (gic->uid == acpi_id)) {
		*apic_id = gic->gic_id;
		return 0;
	}

	return -EINVAL;
}

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;
		} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
			if (!map_gic_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);
	} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
		map_gic_id(header, type, acpi_id, &apic_id);
	}

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

int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id)
{
	int apic_id;

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

	return apic_id;
}

int acpi_map_cpuid(int apic_id, u32 acpi_id)
{
#ifdef CONFIG_SMP
	int i;
#endif

	if (apic_id == -1) {
		/*
		 * On UP processor, there is no _MAT or MADT table.
		 * So above apic_id is always set to -1.
		 *
		 * BIOS may define multiple CPU handles even for UP processor.
		 * For example,
		 *
		 * Scope (_PR)
                 * {
		 *     Processor (CPU0, 0x00, 0x00000410, 0x06) {}
		 *     Processor (CPU1, 0x01, 0x00000410, 0x06) {}
		 *     Processor (CPU2, 0x02, 0x00000410, 0x06) {}
		 *     Processor (CPU3, 0x03, 0x00000410, 0x06) {}
		 * }
		 *
		 * Ignores apic_id and always returns 0 for the processor
		 * handle with acpi id 0 if nr_cpu_ids is 1.
		 * This should be the case if SMP tables are not found.
		 * Return -1 for other CPU's handle.
		 */
		if (nr_cpu_ids <= 1 && acpi_id == 0)
			return acpi_id;
		else
			return apic_id;
	}

#ifdef CONFIG_SMP
	for_each_possible_cpu(i) {
		if (cpu_physical_id(i) == apic_id)
			return i;
	}
#else
	/* In UP kernel, only processor 0 is valid */
	if (apic_id == 0)
		return apic_id;
#endif
	return -1;
}

int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
	int apic_id;

	apic_id = acpi_get_apicid(handle, type, acpi_id);

	return acpi_map_cpuid(apic_id, acpi_id);
}
EXPORT_SYMBOL_GPL(acpi_get_cpuid);

static bool __init 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 acpi_status
acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
{
	acpi_status status = AE_OK;

	if (boot_option_idle_override == 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);
}

static acpi_status __init
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;
}

#if defined(CONFIG_X86) || defined(CONFIG_IA64)
static int __init set_no_mwait(const struct dmi_system_id *id)
{
	pr_notice(PREFIX "%s detected - disabling mwait for CPU C-states\n",
		  id->ident);
	boot_option_idle_override = IDLE_NOMWAIT;
	return 0;
}

static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
	{
	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},
	{},
};

static void __init processor_dmi_check(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);
}
#else
static inline void processor_dmi_check(void) {}
#endif

void __init acpi_early_processor_set_pdc(void)
{
	processor_dmi_check();

	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
			    ACPI_UINT32_MAX,
			    early_init_pdc, NULL, NULL, NULL);
	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, 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	*/
214f2c90	10	#include <linux/export.h>
78f16996	11	#include <linux/dmi.h>
5a0e3ad6	12	#include <linux/slab.h>
8b48463f	13	#include <linux/acpi.h>
78f16996 AC	14	#include <acpi/processor.h>
	15
	16	#include "internal.h"
	17
78f16996	18	#define _COMPONENT ACPI_PROCESSOR_COMPONENT
4d5d4cd8	19	ACPI_MODULE_NAME("processor_core");
78f16996	20
78ed8bd2 AC	21	static int map_lapic_id(struct acpi_subtable_header *entry,
	22	u32 acpi_id, int *apic_id)
	23	{
	24	struct acpi_madt_local_apic *lapic =
	25	(struct acpi_madt_local_apic *)entry;
11130736 AC	26
11130736 AC	27	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
038d7b59	28	return -ENODEV;
11130736 AC	29
11130736 AC	30	if (lapic->processor_id != acpi_id)
038d7b59	31	return -EINVAL;
11130736 AC	32
11130736 AC	33	*apic_id = lapic->id;
038d7b59	34	return 0;
78ed8bd2 AC	35	}
	36
	37	static int map_x2apic_id(struct acpi_subtable_header *entry,
	38	int device_declaration, u32 acpi_id, int *apic_id)
	39	{
	40	struct acpi_madt_local_x2apic *apic =
	41	(struct acpi_madt_local_x2apic *)entry;
78ed8bd2	42
78ed8bd2	43	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
038d7b59	44	return -ENODEV;
78ed8bd2	45
d6742095 AC	46	if (device_declaration && (apic->uid == acpi_id)) {
d6742095 AC	47	*apic_id = apic->local_apic_id;
038d7b59	48	return 0;
78ed8bd2 AC	49	}
78ed8bd2 AC	50
038d7b59	51	return -EINVAL;
78ed8bd2 AC	52	}
	53
	54	static int map_lsapic_id(struct acpi_subtable_header *entry,
	55	int device_declaration, u32 acpi_id, int *apic_id)
	56	{
	57	struct acpi_madt_local_sapic *lsapic =
	58	(struct acpi_madt_local_sapic *)entry;
78ed8bd2	59
78ed8bd2	60	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
038d7b59	61	return -ENODEV;
78ed8bd2	62
78ed8bd2	63	if (device_declaration) {
eae701ce	64	if ((entry->length < 16) \|\| (lsapic->uid != acpi_id))
038d7b59	65	return -EINVAL;
eae701ce	66	} else if (lsapic->processor_id != acpi_id)
038d7b59	67	return -EINVAL;
78ed8bd2	68
eae701ce	69	*apic_id = (lsapic->id << 8) \| lsapic->eid;
038d7b59	70	return 0;
78ed8bd2 AC	71	}
78ed8bd2 AC	72
df86f5df HG	73	static int map_gic_id(struct acpi_subtable_header *entry,
	74	int device_declaration, u32 acpi_id, int *apic_id)
	75	{
	76	struct acpi_madt_generic_interrupt *gic =
	77	(struct acpi_madt_generic_interrupt *)entry;
	78
	79	if (!(gic->flags & ACPI_MADT_ENABLED))
	80	return -ENODEV;
	81
	82	/*
	83	* In the GIC interrupt model, logical processors are
	84	* required to have a Processor Device object in the DSDT,
	85	* so we should check device_declaration here
	86	*/
	87	if (device_declaration && (gic->uid == acpi_id)) {
	88	*apic_id = gic->gic_id;
	89	return 0;
	90	}
	91
	92	return -EINVAL;
	93	}
	94
78ed8bd2 AC	95	static int map_madt_entry(int type, u32 acpi_id)
	96	{
	97	unsigned long madt_end, entry;
149fe9c2 AC	98	static struct acpi_table_madt *madt;
149fe9c2 AC	99	static int read_madt;
78ed8bd2 AC	100	int apic_id = -1;
78ed8bd2 AC	101
149fe9c2 AC	102	if (!read_madt) {
	103	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
	104	(struct acpi_table_header **)&madt)))
	105	madt = NULL;
	106	read_madt++;
	107	}
	108
78ed8bd2 AC	109	if (!madt)
	110	return apic_id;
	111
	112	entry = (unsigned long)madt;
	113	madt_end = entry + madt->header.length;
	114
	115	/* Parse all entries looking for a match. */
	116
	117	entry += sizeof(struct acpi_table_madt);
	118	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
	119	struct acpi_subtable_header *header =
	120	(struct acpi_subtable_header *)entry;
	121	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
038d7b59	122	if (!map_lapic_id(header, acpi_id, &apic_id))
78ed8bd2 AC	123	break;
78ed8bd2 AC	124	} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
038d7b59	125	if (!map_x2apic_id(header, type, acpi_id, &apic_id))
78ed8bd2 AC	126	break;
78ed8bd2 AC	127	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
038d7b59	128	if (!map_lsapic_id(header, type, acpi_id, &apic_id))
78ed8bd2	129	break;
df86f5df HG	130	} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
	131	if (!map_gic_id(header, type, acpi_id, &apic_id))
	132	break;
78ed8bd2 AC	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);
df86f5df HG	163	} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
df86f5df HG	164	map_gic_id(header, type, acpi_id, &apic_id);
78ed8bd2 AC	165	}
	166
	167	exit:
5273a258	168	kfree(buffer.pointer);
78ed8bd2 AC	169	return apic_id;
	170	}
	171
ca9f62ac	172	int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id)
78ed8bd2	173	{
ca9f62ac	174	int apic_id;
78ed8bd2 AC	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);
ca9f62ac JL	179
	180	return apic_id;
	181	}
	182
	183	int acpi_map_cpuid(int apic_id, u32 acpi_id)
	184	{
	185	#ifdef CONFIG_SMP
	186	int i;
	187	#endif
	188
d640113f LM	189	if (apic_id == -1) {
	190	/*
	191	* On UP processor, there is no _MAT or MADT table.
	192	* So above apic_id is always set to -1.
	193	*
	194	* BIOS may define multiple CPU handles even for UP processor.
	195	* For example,
	196	*
	197	* Scope (_PR)
	198	* {
	199	* Processor (CPU0, 0x00, 0x00000410, 0x06) {}
	200	* Processor (CPU1, 0x01, 0x00000410, 0x06) {}
	201	* Processor (CPU2, 0x02, 0x00000410, 0x06) {}
	202	* Processor (CPU3, 0x03, 0x00000410, 0x06) {}
	203	* }
	204	*
c4686c71 TR	205	* Ignores apic_id and always returns 0 for the processor
	206	* handle with acpi id 0 if nr_cpu_ids is 1.
	207	* This should be the case if SMP tables are not found.
d640113f LM	208	* Return -1 for other CPU's handle.
d640113f LM	209	*/
c4686c71	210	if (nr_cpu_ids <= 1 && acpi_id == 0)
d640113f LM	211	return acpi_id;
	212	else
	213	return apic_id;
	214	}
78ed8bd2	215
932df741	216	#ifdef CONFIG_SMP
78ed8bd2 AC	217	for_each_possible_cpu(i) {
	218	if (cpu_physical_id(i) == apic_id)
	219	return i;
	220	}
932df741 LM	221	#else
	222	/* In UP kernel, only processor 0 is valid */
	223	if (apic_id == 0)
	224	return apic_id;
	225	#endif
78ed8bd2 AC	226	return -1;
78ed8bd2 AC	227	}
ca9f62ac JL	228
	229	int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
	230	{
	231	int apic_id;
	232
	233	apic_id = acpi_get_apicid(handle, type, acpi_id);
	234
	235	return acpi_map_cpuid(apic_id, acpi_id);
	236	}
78ed8bd2	237	EXPORT_SYMBOL_GPL(acpi_get_cpuid);
78ed8bd2	238
6430c9c1	239	static bool __init processor_physically_present(acpi_handle handle)
5d554a7b AC	240	{
	241	int cpuid, type;
	242	u32 acpi_id;
	243	acpi_status status;
	244	acpi_object_type acpi_type;
	245	unsigned long long tmp;
	246	union acpi_object object = { 0 };
	247	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
	248
	249	status = acpi_get_type(handle, &acpi_type);
	250	if (ACPI_FAILURE(status))
	251	return false;
	252
	253	switch (acpi_type) {
	254	case ACPI_TYPE_PROCESSOR:
	255	status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
	256	if (ACPI_FAILURE(status))
	257	return false;
	258	acpi_id = object.processor.proc_id;
	259	break;
	260	case ACPI_TYPE_DEVICE:
	261	status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
	262	if (ACPI_FAILURE(status))
	263	return false;
	264	acpi_id = tmp;
	265	break;
	266	default:
	267	return false;
	268	}
	269
	270	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
	271	cpuid = acpi_get_cpuid(handle, type, acpi_id);
	272
932df741	273	if (cpuid == -1)
5d554a7b AC	274	return false;
	275
	276	return true;
	277	}
78ed8bd2	278
fe7bf106	279	static void acpi_set_pdc_bits(u32 *buf)
08ea48a3 AC	280	{
	281	buf[0] = ACPI_PDC_REVISION_ID;
	282	buf[1] = 1;
	283
	284	/* Enable coordination with firmware's _TSD info */
	285	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
6c5807d7 AC	286
	287	/* Twiddle arch-specific bits needed for _PDC */
	288	arch_acpi_set_pdc_bits(buf);
08ea48a3 AC	289	}
08ea48a3 AC	290
fe7bf106	291	static struct acpi_object_list *acpi_processor_alloc_pdc(void)
407cd87c AC	292	{
	293	struct acpi_object_list *obj_list;
	294	union acpi_object *obj;
	295	u32 *buf;
	296
407cd87c AC	297	/* allocate and initialize pdc. It will be used later. */
	298	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	299	if (!obj_list) {
	300	printk(KERN_ERR "Memory allocation error\n");
3b407aef	301	return NULL;
407cd87c AC	302	}
	303
	304	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	305	if (!obj) {
	306	printk(KERN_ERR "Memory allocation error\n");
	307	kfree(obj_list);
3b407aef	308	return NULL;
407cd87c AC	309	}
	310
	311	buf = kmalloc(12, GFP_KERNEL);
	312	if (!buf) {
	313	printk(KERN_ERR "Memory allocation error\n");
	314	kfree(obj);
	315	kfree(obj_list);
3b407aef	316	return NULL;
407cd87c AC	317	}
407cd87c AC	318
08ea48a3 AC	319	acpi_set_pdc_bits(buf);
08ea48a3 AC	320
407cd87c AC	321	obj->type = ACPI_TYPE_BUFFER;
	322	obj->buffer.length = 12;
	323	obj->buffer.pointer = (u8 *) buf;
	324	obj_list->count = 1;
	325	obj_list->pointer = obj;
407cd87c	326
3b407aef	327	return obj_list;
407cd87c AC	328	}
407cd87c AC	329
78f16996 AC	330	/*
	331	* _PDC is required for a BIOS-OS handshake for most of the newer
	332	* ACPI processor features.
	333	*/
1606484e	334	static acpi_status
fa118564	335	acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
78f16996	336	{
78f16996 AC	337	acpi_status status = AE_OK;
78f16996 AC	338
d1896049	339	if (boot_option_idle_override == IDLE_NOMWAIT) {
78f16996 AC	340	/*
	341	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	342	* mode will be disabled in the parameter of _PDC object.
	343	* Of course C1_FFH access mode will also be disabled.
	344	*/
	345	union acpi_object *obj;
	346	u32 *buffer = NULL;
	347
	348	obj = pdc_in->pointer;
	349	buffer = (u32 *)(obj->buffer.pointer);
	350	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	351
	352	}
fa118564	353	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
78f16996 AC	354
	355	if (ACPI_FAILURE(status))
	356	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	357	"Could not evaluate _PDC, using legacy perf. control.\n"));
	358
	359	return status;
	360	}
	361
fe7bf106	362	void acpi_processor_set_pdc(acpi_handle handle)
78f16996	363	{
3b407aef AC	364	struct acpi_object_list *obj_list;
3b407aef AC	365
1d9cb470 AC	366	if (arch_has_acpi_pdc() == false)
	367	return;
	368
3b407aef AC	369	obj_list = acpi_processor_alloc_pdc();
	370	if (!obj_list)
	371	return;
	372
43bab25c	373	acpi_processor_eval_pdc(handle, obj_list);
b9c2db78 AC	374
	375	kfree(obj_list->pointer->buffer.pointer);
	376	kfree(obj_list->pointer);
	377	kfree(obj_list);
78f16996	378	}
78f16996	379
6430c9c1	380	static acpi_status __init
78f16996 AC	381	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
78f16996 AC	382	{
5d554a7b AC	383	if (processor_physically_present(handle) == false)
	384	return AE_OK;
	385
43bab25c	386	acpi_processor_set_pdc(handle);
78f16996 AC	387	return AE_OK;
	388	}
	389
2c4fa003 HG	390	#if defined(CONFIG_X86) \|\| defined(CONFIG_IA64)
	391	static int __init set_no_mwait(const struct dmi_system_id *id)
	392	{
	393	pr_notice(PREFIX "%s detected - disabling mwait for CPU C-states\n",
	394	id->ident);
	395	boot_option_idle_override = IDLE_NOMWAIT;
	396	return 0;
	397	}
	398
	399	static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
	400	{
	401	set_no_mwait, "Extensa 5220", {
	402	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
	403	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	404	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
	405	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
	406	{},
	407	};
	408
	409	static void __init processor_dmi_check(void)
78f16996 AC	410	{
	411	/*
	412	* Check whether the system is DMI table. If yes, OSPM
	413	* should not use mwait for CPU-states.
	414	*/
	415	dmi_check_system(processor_idle_dmi_table);
2c4fa003 HG	416	}
	417	#else
	418	static inline void processor_dmi_check(void) {}
	419	#endif
	420
	421	void __init acpi_early_processor_set_pdc(void)
	422	{
	423	processor_dmi_check();
78f16996 AC	424
	425	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	426	ACPI_UINT32_MAX,
	427	early_init_pdc, NULL, NULL, NULL);
52056925	428	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
78f16996	429	}