[deliverable/linux.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_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:
	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	}
	72
	73	static int map_madt_entry(int type, u32 acpi_id)
	74	{
	75	unsigned long madt_end, entry;
149fe9c2 AC	76	static struct acpi_table_madt *madt;
149fe9c2 AC	77	static int read_madt;
78ed8bd2 AC	78	int apic_id = -1;
78ed8bd2 AC	79
149fe9c2 AC	80	if (!read_madt) {
	81	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
	82	(struct acpi_table_header **)&madt)))
	83	madt = NULL;
	84	read_madt++;
	85	}
	86
78ed8bd2 AC	87	if (!madt)
	88	return apic_id;
	89
	90	entry = (unsigned long)madt;
	91	madt_end = entry + madt->header.length;
	92
	93	/* Parse all entries looking for a match. */
	94
	95	entry += sizeof(struct acpi_table_madt);
	96	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
	97	struct acpi_subtable_header *header =
	98	(struct acpi_subtable_header *)entry;
	99	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
038d7b59	100	if (!map_lapic_id(header, acpi_id, &apic_id))
78ed8bd2 AC	101	break;
78ed8bd2 AC	102	} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
038d7b59	103	if (!map_x2apic_id(header, type, acpi_id, &apic_id))
78ed8bd2 AC	104	break;
78ed8bd2 AC	105	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
038d7b59	106	if (!map_lsapic_id(header, type, acpi_id, &apic_id))
78ed8bd2 AC	107	break;
	108	}
	109	entry += header->length;
	110	}
	111	return apic_id;
	112	}
	113
	114	static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
	115	{
	116	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	117	union acpi_object *obj;
	118	struct acpi_subtable_header *header;
	119	int apic_id = -1;
	120
	121	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
	122	goto exit;
	123
	124	if (!buffer.length \|\| !buffer.pointer)
	125	goto exit;
	126
	127	obj = buffer.pointer;
	128	if (obj->type != ACPI_TYPE_BUFFER \|\|
	129	obj->buffer.length < sizeof(struct acpi_subtable_header)) {
	130	goto exit;
	131	}
	132
	133	header = (struct acpi_subtable_header *)obj->buffer.pointer;
	134	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
	135	map_lapic_id(header, acpi_id, &apic_id);
	136	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
	137	map_lsapic_id(header, type, acpi_id, &apic_id);
	138	}
	139
	140	exit:
5273a258	141	kfree(buffer.pointer);
78ed8bd2 AC	142	return apic_id;
	143	}
	144
ca9f62ac	145	int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id)
78ed8bd2	146	{
ca9f62ac	147	int apic_id;
78ed8bd2 AC	148
	149	apic_id = map_mat_entry(handle, type, acpi_id);
	150	if (apic_id == -1)
	151	apic_id = map_madt_entry(type, acpi_id);
ca9f62ac JL	152
	153	return apic_id;
	154	}
	155
	156	int acpi_map_cpuid(int apic_id, u32 acpi_id)
	157	{
	158	#ifdef CONFIG_SMP
	159	int i;
	160	#endif
	161
d640113f LM	162	if (apic_id == -1) {
	163	/*
	164	* On UP processor, there is no _MAT or MADT table.
	165	* So above apic_id is always set to -1.
	166	*
	167	* BIOS may define multiple CPU handles even for UP processor.
	168	* For example,
	169	*
	170	* Scope (_PR)
	171	* {
	172	* Processor (CPU0, 0x00, 0x00000410, 0x06) {}
	173	* Processor (CPU1, 0x01, 0x00000410, 0x06) {}
	174	* Processor (CPU2, 0x02, 0x00000410, 0x06) {}
	175	* Processor (CPU3, 0x03, 0x00000410, 0x06) {}
	176	* }
	177	*
c4686c71 TR	178	* Ignores apic_id and always returns 0 for the processor
	179	* handle with acpi id 0 if nr_cpu_ids is 1.
	180	* This should be the case if SMP tables are not found.
d640113f LM	181	* Return -1 for other CPU's handle.
d640113f LM	182	*/
c4686c71	183	if (nr_cpu_ids <= 1 && acpi_id == 0)
d640113f LM	184	return acpi_id;
	185	else
	186	return apic_id;
	187	}
78ed8bd2	188
932df741	189	#ifdef CONFIG_SMP
78ed8bd2 AC	190	for_each_possible_cpu(i) {
	191	if (cpu_physical_id(i) == apic_id)
	192	return i;
	193	}
932df741 LM	194	#else
	195	/* In UP kernel, only processor 0 is valid */
	196	if (apic_id == 0)
	197	return apic_id;
	198	#endif
78ed8bd2 AC	199	return -1;
78ed8bd2 AC	200	}
ca9f62ac JL	201
	202	int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
	203	{
	204	int apic_id;
	205
	206	apic_id = acpi_get_apicid(handle, type, acpi_id);
	207
	208	return acpi_map_cpuid(apic_id, acpi_id);
	209	}
78ed8bd2	210	EXPORT_SYMBOL_GPL(acpi_get_cpuid);
78ed8bd2	211
6430c9c1	212	static bool __init processor_physically_present(acpi_handle handle)
5d554a7b AC	213	{
	214	int cpuid, type;
	215	u32 acpi_id;
	216	acpi_status status;
	217	acpi_object_type acpi_type;
	218	unsigned long long tmp;
	219	union acpi_object object = { 0 };
	220	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
	221
	222	status = acpi_get_type(handle, &acpi_type);
	223	if (ACPI_FAILURE(status))
	224	return false;
	225
	226	switch (acpi_type) {
	227	case ACPI_TYPE_PROCESSOR:
	228	status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
	229	if (ACPI_FAILURE(status))
	230	return false;
	231	acpi_id = object.processor.proc_id;
	232	break;
	233	case ACPI_TYPE_DEVICE:
	234	status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
	235	if (ACPI_FAILURE(status))
	236	return false;
	237	acpi_id = tmp;
	238	break;
	239	default:
	240	return false;
	241	}
	242
	243	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
	244	cpuid = acpi_get_cpuid(handle, type, acpi_id);
	245
932df741	246	if (cpuid == -1)
5d554a7b AC	247	return false;
	248
	249	return true;
	250	}
78ed8bd2	251
fe7bf106	252	static void acpi_set_pdc_bits(u32 *buf)
08ea48a3 AC	253	{
	254	buf[0] = ACPI_PDC_REVISION_ID;
	255	buf[1] = 1;
	256
	257	/* Enable coordination with firmware's _TSD info */
	258	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
6c5807d7 AC	259
	260	/* Twiddle arch-specific bits needed for _PDC */
	261	arch_acpi_set_pdc_bits(buf);
08ea48a3 AC	262	}
08ea48a3 AC	263
fe7bf106	264	static struct acpi_object_list *acpi_processor_alloc_pdc(void)
407cd87c AC	265	{
	266	struct acpi_object_list *obj_list;
	267	union acpi_object *obj;
	268	u32 *buf;
	269
407cd87c AC	270	/* allocate and initialize pdc. It will be used later. */
	271	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	272	if (!obj_list) {
	273	printk(KERN_ERR "Memory allocation error\n");
3b407aef	274	return NULL;
407cd87c AC	275	}
	276
	277	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	278	if (!obj) {
	279	printk(KERN_ERR "Memory allocation error\n");
	280	kfree(obj_list);
3b407aef	281	return NULL;
407cd87c AC	282	}
	283
	284	buf = kmalloc(12, GFP_KERNEL);
	285	if (!buf) {
	286	printk(KERN_ERR "Memory allocation error\n");
	287	kfree(obj);
	288	kfree(obj_list);
3b407aef	289	return NULL;
407cd87c AC	290	}
407cd87c AC	291
08ea48a3 AC	292	acpi_set_pdc_bits(buf);
08ea48a3 AC	293
407cd87c AC	294	obj->type = ACPI_TYPE_BUFFER;
	295	obj->buffer.length = 12;
	296	obj->buffer.pointer = (u8 *) buf;
	297	obj_list->count = 1;
	298	obj_list->pointer = obj;
407cd87c	299
3b407aef	300	return obj_list;
407cd87c AC	301	}
407cd87c AC	302
78f16996 AC	303	/*
	304	* _PDC is required for a BIOS-OS handshake for most of the newer
	305	* ACPI processor features.
	306	*/
1606484e	307	static acpi_status
fa118564	308	acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
78f16996	309	{
78f16996 AC	310	acpi_status status = AE_OK;
78f16996 AC	311
d1896049	312	if (boot_option_idle_override == IDLE_NOMWAIT) {
78f16996 AC	313	/*
	314	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	315	* mode will be disabled in the parameter of _PDC object.
	316	* Of course C1_FFH access mode will also be disabled.
	317	*/
	318	union acpi_object *obj;
	319	u32 *buffer = NULL;
	320
	321	obj = pdc_in->pointer;
	322	buffer = (u32 *)(obj->buffer.pointer);
	323	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	324
	325	}
fa118564	326	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
78f16996 AC	327
	328	if (ACPI_FAILURE(status))
	329	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	330	"Could not evaluate _PDC, using legacy perf. control.\n"));
	331
	332	return status;
	333	}
	334
fe7bf106	335	void acpi_processor_set_pdc(acpi_handle handle)
78f16996	336	{
3b407aef AC	337	struct acpi_object_list *obj_list;
3b407aef AC	338
1d9cb470 AC	339	if (arch_has_acpi_pdc() == false)
	340	return;
	341
3b407aef AC	342	obj_list = acpi_processor_alloc_pdc();
	343	if (!obj_list)
	344	return;
	345
43bab25c	346	acpi_processor_eval_pdc(handle, obj_list);
b9c2db78 AC	347
	348	kfree(obj_list->pointer->buffer.pointer);
	349	kfree(obj_list->pointer);
	350	kfree(obj_list);
78f16996	351	}
78f16996	352
6430c9c1	353	static acpi_status __init
78f16996 AC	354	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
78f16996 AC	355	{
5d554a7b AC	356	if (processor_physically_present(handle) == false)
	357	return AE_OK;
	358
43bab25c	359	acpi_processor_set_pdc(handle);
78f16996 AC	360	return AE_OK;
	361	}
	362
2c4fa003 HG	363	#if defined(CONFIG_X86) \|\| defined(CONFIG_IA64)
	364	static int __init set_no_mwait(const struct dmi_system_id *id)
	365	{
	366	pr_notice(PREFIX "%s detected - disabling mwait for CPU C-states\n",
	367	id->ident);
	368	boot_option_idle_override = IDLE_NOMWAIT;
	369	return 0;
	370	}
	371
	372	static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
	373	{
	374	set_no_mwait, "Extensa 5220", {
	375	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
	376	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	377	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
	378	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
	379	{},
	380	};
	381
	382	static void __init processor_dmi_check(void)
78f16996 AC	383	{
	384	/*
	385	* Check whether the system is DMI table. If yes, OSPM
	386	* should not use mwait for CPU-states.
	387	*/
	388	dmi_check_system(processor_idle_dmi_table);
2c4fa003 HG	389	}
	390	#else
	391	static inline void processor_dmi_check(void) {}
	392	#endif
	393
	394	void __init acpi_early_processor_set_pdc(void)
	395	{
	396	processor_dmi_check();
78f16996 AC	397
	398	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	399	ACPI_UINT32_MAX,
	400	early_init_pdc, NULL, NULL, NULL);
52056925	401	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
78f16996	402	}