[mirror_ubuntu-zesty-kernel.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 <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 __init set_no_mwait(const struct dmi_system_id *id)
{
	printk(KERN_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 __initdata processor_idle_dmi_table[] = {
	{
	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 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)
{
#ifdef CONFIG_SMP
	int i;
#endif
	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) {
		/*
		 * 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;
}
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 __cpuinit 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 *__cpuinit 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 __cpuinit
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 __cpuinit 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;
}

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);
	acpi_get_devices("ACPI0007", 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>
78f16996 AC	13
	14	#include <acpi/acpi_drivers.h>
	15	#include <acpi/processor.h>
	16
	17	#include "internal.h"
	18
	19	#define PREFIX "ACPI: "
	20	#define _COMPONENT ACPI_PROCESSOR_COMPONENT
4d5d4cd8	21	ACPI_MODULE_NAME("processor_core");
78f16996	22
6430c9c1	23	static int __init set_no_mwait(const struct dmi_system_id *id)
78f16996 AC	24	{
	25	printk(KERN_NOTICE PREFIX "%s detected - "
	26	"disabling mwait for CPU C-states\n", id->ident);
d1896049	27	boot_option_idle_override = IDLE_NOMWAIT;
78f16996 AC	28	return 0;
	29	}
	30
6430c9c1	31	static struct dmi_system_id __initdata processor_idle_dmi_table[] = {
78f16996 AC	32	{
	33	set_no_mwait, "Extensa 5220", {
	34	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
	35	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	36	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
	37	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
	38	{},
	39	};
	40
78ed8bd2 AC	41	static int map_lapic_id(struct acpi_subtable_header *entry,
	42	u32 acpi_id, int *apic_id)
	43	{
	44	struct acpi_madt_local_apic *lapic =
	45	(struct acpi_madt_local_apic *)entry;
11130736 AC	46
	47	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
	48	return 0;
	49
	50	if (lapic->processor_id != acpi_id)
	51	return 0;
	52
	53	*apic_id = lapic->id;
	54	return 1;
78ed8bd2 AC	55	}
	56
	57	static int map_x2apic_id(struct acpi_subtable_header *entry,
	58	int device_declaration, u32 acpi_id, int *apic_id)
	59	{
	60	struct acpi_madt_local_x2apic *apic =
	61	(struct acpi_madt_local_x2apic *)entry;
78ed8bd2	62
78ed8bd2 AC	63	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
	64	return 0;
	65
d6742095 AC	66	if (device_declaration && (apic->uid == acpi_id)) {
	67	*apic_id = apic->local_apic_id;
	68	return 1;
78ed8bd2 AC	69	}
	70
	71	return 0;
78ed8bd2 AC	72	}
	73
	74	static int map_lsapic_id(struct acpi_subtable_header *entry,
	75	int device_declaration, u32 acpi_id, int *apic_id)
	76	{
	77	struct acpi_madt_local_sapic *lsapic =
	78	(struct acpi_madt_local_sapic *)entry;
78ed8bd2	79
78ed8bd2 AC	80	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
	81	return 0;
	82
78ed8bd2	83	if (device_declaration) {
eae701ce AC	84	if ((entry->length < 16) \|\| (lsapic->uid != acpi_id))
	85	return 0;
	86	} else if (lsapic->processor_id != acpi_id)
	87	return 0;
78ed8bd2	88
eae701ce	89	*apic_id = (lsapic->id << 8) \| lsapic->eid;
78ed8bd2 AC	90	return 1;
	91	}
	92
	93	static int map_madt_entry(int type, u32 acpi_id)
	94	{
	95	unsigned long madt_end, entry;
149fe9c2 AC	96	static struct acpi_table_madt *madt;
149fe9c2 AC	97	static int read_madt;
78ed8bd2 AC	98	int apic_id = -1;
78ed8bd2 AC	99
149fe9c2 AC	100	if (!read_madt) {
	101	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
	102	(struct acpi_table_header **)&madt)))
	103	madt = NULL;
	104	read_madt++;
	105	}
	106
78ed8bd2 AC	107	if (!madt)
	108	return apic_id;
	109
	110	entry = (unsigned long)madt;
	111	madt_end = entry + madt->header.length;
	112
	113	/* Parse all entries looking for a match. */
	114
	115	entry += sizeof(struct acpi_table_madt);
	116	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
	117	struct acpi_subtable_header *header =
	118	(struct acpi_subtable_header *)entry;
	119	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
	120	if (map_lapic_id(header, acpi_id, &apic_id))
	121	break;
	122	} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
	123	if (map_x2apic_id(header, type, acpi_id, &apic_id))
	124	break;
	125	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
	126	if (map_lsapic_id(header, type, acpi_id, &apic_id))
	127	break;
	128	}
	129	entry += header->length;
	130	}
	131	return apic_id;
	132	}
	133
	134	static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
	135	{
	136	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	137	union acpi_object *obj;
	138	struct acpi_subtable_header *header;
	139	int apic_id = -1;
	140
	141	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
	142	goto exit;
	143
	144	if (!buffer.length \|\| !buffer.pointer)
	145	goto exit;
	146
	147	obj = buffer.pointer;
	148	if (obj->type != ACPI_TYPE_BUFFER \|\|
	149	obj->buffer.length < sizeof(struct acpi_subtable_header)) {
	150	goto exit;
	151	}
	152
	153	header = (struct acpi_subtable_header *)obj->buffer.pointer;
	154	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
	155	map_lapic_id(header, acpi_id, &apic_id);
	156	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
	157	map_lsapic_id(header, type, acpi_id, &apic_id);
	158	}
	159
	160	exit:
	161	if (buffer.pointer)
	162	kfree(buffer.pointer);
	163	return apic_id;
	164	}
	165
	166	int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
	167	{
932df741	168	#ifdef CONFIG_SMP
78ed8bd2	169	int i;
932df741	170	#endif
78ed8bd2 AC	171	int apic_id = -1;
	172
	173	apic_id = map_mat_entry(handle, type, acpi_id);
	174	if (apic_id == -1)
	175	apic_id = map_madt_entry(type, acpi_id);
d640113f LM	176	if (apic_id == -1) {
	177	/*
	178	* On UP processor, there is no _MAT or MADT table.
	179	* So above apic_id is always set to -1.
	180	*
	181	* BIOS may define multiple CPU handles even for UP processor.
	182	* For example,
	183	*
	184	* Scope (_PR)
	185	* {
	186	* Processor (CPU0, 0x00, 0x00000410, 0x06) {}
	187	* Processor (CPU1, 0x01, 0x00000410, 0x06) {}
	188	* Processor (CPU2, 0x02, 0x00000410, 0x06) {}
	189	* Processor (CPU3, 0x03, 0x00000410, 0x06) {}
	190	* }
	191	*
c4686c71 TR	192	* Ignores apic_id and always returns 0 for the processor
	193	* handle with acpi id 0 if nr_cpu_ids is 1.
	194	* This should be the case if SMP tables are not found.
d640113f LM	195	* Return -1 for other CPU's handle.
d640113f LM	196	*/
c4686c71	197	if (nr_cpu_ids <= 1 && acpi_id == 0)
d640113f LM	198	return acpi_id;
	199	else
	200	return apic_id;
	201	}
78ed8bd2	202
932df741	203	#ifdef CONFIG_SMP
78ed8bd2 AC	204	for_each_possible_cpu(i) {
	205	if (cpu_physical_id(i) == apic_id)
	206	return i;
	207	}
932df741 LM	208	#else
	209	/* In UP kernel, only processor 0 is valid */
	210	if (apic_id == 0)
	211	return apic_id;
	212	#endif
78ed8bd2 AC	213	return -1;
	214	}
	215	EXPORT_SYMBOL_GPL(acpi_get_cpuid);
78ed8bd2	216
6430c9c1	217	static bool __init processor_physically_present(acpi_handle handle)
5d554a7b AC	218	{
	219	int cpuid, type;
	220	u32 acpi_id;
	221	acpi_status status;
	222	acpi_object_type acpi_type;
	223	unsigned long long tmp;
	224	union acpi_object object = { 0 };
	225	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
	226
	227	status = acpi_get_type(handle, &acpi_type);
	228	if (ACPI_FAILURE(status))
	229	return false;
	230
	231	switch (acpi_type) {
	232	case ACPI_TYPE_PROCESSOR:
	233	status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
	234	if (ACPI_FAILURE(status))
	235	return false;
	236	acpi_id = object.processor.proc_id;
	237	break;
	238	case ACPI_TYPE_DEVICE:
	239	status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
	240	if (ACPI_FAILURE(status))
	241	return false;
	242	acpi_id = tmp;
	243	break;
	244	default:
	245	return false;
	246	}
	247
	248	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
	249	cpuid = acpi_get_cpuid(handle, type, acpi_id);
	250
932df741	251	if (cpuid == -1)
5d554a7b AC	252	return false;
	253
	254	return true;
	255	}
78ed8bd2	256
af10f941	257	static void __cpuinit acpi_set_pdc_bits(u32 *buf)
08ea48a3 AC	258	{
	259	buf[0] = ACPI_PDC_REVISION_ID;
	260	buf[1] = 1;
	261
	262	/* Enable coordination with firmware's _TSD info */
	263	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
6c5807d7 AC	264
	265	/* Twiddle arch-specific bits needed for _PDC */
	266	arch_acpi_set_pdc_bits(buf);
08ea48a3 AC	267	}
08ea48a3 AC	268
af10f941	269	static struct acpi_object_list *__cpuinit acpi_processor_alloc_pdc(void)
407cd87c AC	270	{
	271	struct acpi_object_list *obj_list;
	272	union acpi_object *obj;
	273	u32 *buf;
	274
407cd87c AC	275	/* allocate and initialize pdc. It will be used later. */
	276	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	277	if (!obj_list) {
	278	printk(KERN_ERR "Memory allocation error\n");
3b407aef	279	return NULL;
407cd87c AC	280	}
	281
	282	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	283	if (!obj) {
	284	printk(KERN_ERR "Memory allocation error\n");
	285	kfree(obj_list);
3b407aef	286	return NULL;
407cd87c AC	287	}
	288
	289	buf = kmalloc(12, GFP_KERNEL);
	290	if (!buf) {
	291	printk(KERN_ERR "Memory allocation error\n");
	292	kfree(obj);
	293	kfree(obj_list);
3b407aef	294	return NULL;
407cd87c AC	295	}
407cd87c AC	296
08ea48a3 AC	297	acpi_set_pdc_bits(buf);
08ea48a3 AC	298
407cd87c AC	299	obj->type = ACPI_TYPE_BUFFER;
	300	obj->buffer.length = 12;
	301	obj->buffer.pointer = (u8 *) buf;
	302	obj_list->count = 1;
	303	obj_list->pointer = obj;
407cd87c	304
3b407aef	305	return obj_list;
407cd87c AC	306	}
407cd87c AC	307
78f16996 AC	308	/*
	309	* _PDC is required for a BIOS-OS handshake for most of the newer
	310	* ACPI processor features.
	311	*/
af10f941	312	static int __cpuinit
fa118564	313	acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
78f16996	314	{
78f16996 AC	315	acpi_status status = AE_OK;
78f16996 AC	316
d1896049	317	if (boot_option_idle_override == IDLE_NOMWAIT) {
78f16996 AC	318	/*
	319	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	320	* mode will be disabled in the parameter of _PDC object.
	321	* Of course C1_FFH access mode will also be disabled.
	322	*/
	323	union acpi_object *obj;
	324	u32 *buffer = NULL;
	325
	326	obj = pdc_in->pointer;
	327	buffer = (u32 *)(obj->buffer.pointer);
	328	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	329
	330	}
fa118564	331	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
78f16996 AC	332
	333	if (ACPI_FAILURE(status))
	334	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	335	"Could not evaluate _PDC, using legacy perf. control.\n"));
	336
	337	return status;
	338	}
	339
af10f941	340	void __cpuinit acpi_processor_set_pdc(acpi_handle handle)
78f16996	341	{
3b407aef AC	342	struct acpi_object_list *obj_list;
3b407aef AC	343
1d9cb470 AC	344	if (arch_has_acpi_pdc() == false)
	345	return;
	346
3b407aef AC	347	obj_list = acpi_processor_alloc_pdc();
	348	if (!obj_list)
	349	return;
	350
43bab25c	351	acpi_processor_eval_pdc(handle, obj_list);
b9c2db78 AC	352
	353	kfree(obj_list->pointer->buffer.pointer);
	354	kfree(obj_list->pointer);
	355	kfree(obj_list);
78f16996	356	}
78f16996	357
6430c9c1	358	static acpi_status __init
78f16996 AC	359	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
78f16996 AC	360	{
5d554a7b AC	361	if (processor_physically_present(handle) == false)
	362	return AE_OK;
	363
43bab25c	364	acpi_processor_set_pdc(handle);
78f16996 AC	365	return AE_OK;
	366	}
	367
7a0b73a4	368	void __init acpi_early_processor_set_pdc(void)
78f16996 AC	369	{
	370	/*
	371	* Check whether the system is DMI table. If yes, OSPM
	372	* should not use mwait for CPU-states.
	373	*/
	374	dmi_check_system(processor_idle_dmi_table);
	375
	376	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	377	ACPI_UINT32_MAX,
	378	early_init_pdc, NULL, NULL, NULL);
c1e0ddbf	379	acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
78f16996	380	}