[people/arne_f/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 <linux/acpi.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 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 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;
}

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(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
	18	#define PREFIX "ACPI: "
	19	#define _COMPONENT ACPI_PROCESSOR_COMPONENT
4d5d4cd8	20	ACPI_MODULE_NAME("processor_core");
78f16996	21
6430c9c1	22	static int __init set_no_mwait(const struct dmi_system_id *id)
78f16996 AC	23	{
	24	printk(KERN_NOTICE PREFIX "%s detected - "
	25	"disabling mwait for CPU C-states\n", id->ident);
d1896049	26	boot_option_idle_override = IDLE_NOMWAIT;
78f16996 AC	27	return 0;
	28	}
	29
8ef9fc78	30	static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
78f16996 AC	31	{
	32	set_no_mwait, "Extensa 5220", {
	33	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
	34	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	35	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
	36	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
	37	{},
	38	};
	39
78ed8bd2 AC	40	static int map_lapic_id(struct acpi_subtable_header *entry,
	41	u32 acpi_id, int *apic_id)
	42	{
	43	struct acpi_madt_local_apic *lapic =
	44	(struct acpi_madt_local_apic *)entry;
11130736 AC	45
11130736 AC	46	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
038d7b59	47	return -ENODEV;
11130736 AC	48
11130736 AC	49	if (lapic->processor_id != acpi_id)
038d7b59	50	return -EINVAL;
11130736 AC	51
11130736 AC	52	*apic_id = lapic->id;
038d7b59	53	return 0;
78ed8bd2 AC	54	}
	55
	56	static int map_x2apic_id(struct acpi_subtable_header *entry,
	57	int device_declaration, u32 acpi_id, int *apic_id)
	58	{
	59	struct acpi_madt_local_x2apic *apic =
	60	(struct acpi_madt_local_x2apic *)entry;
78ed8bd2	61
78ed8bd2	62	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
038d7b59	63	return -ENODEV;
78ed8bd2	64
d6742095 AC	65	if (device_declaration && (apic->uid == acpi_id)) {
d6742095 AC	66	*apic_id = apic->local_apic_id;
038d7b59	67	return 0;
78ed8bd2 AC	68	}
78ed8bd2 AC	69
038d7b59	70	return -EINVAL;
78ed8bd2 AC	71	}
	72
	73	static int map_lsapic_id(struct acpi_subtable_header *entry,
	74	int device_declaration, u32 acpi_id, int *apic_id)
	75	{
	76	struct acpi_madt_local_sapic *lsapic =
	77	(struct acpi_madt_local_sapic *)entry;
78ed8bd2	78
78ed8bd2	79	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
038d7b59	80	return -ENODEV;
78ed8bd2	81
78ed8bd2	82	if (device_declaration) {
eae701ce	83	if ((entry->length < 16) \|\| (lsapic->uid != acpi_id))
038d7b59	84	return -EINVAL;
eae701ce	85	} else if (lsapic->processor_id != acpi_id)
038d7b59	86	return -EINVAL;
78ed8bd2	87
eae701ce	88	*apic_id = (lsapic->id << 8) \| lsapic->eid;
038d7b59	89	return 0;
78ed8bd2 AC	90	}
	91
	92	static int map_madt_entry(int type, u32 acpi_id)
	93	{
	94	unsigned long madt_end, entry;
149fe9c2 AC	95	static struct acpi_table_madt *madt;
149fe9c2 AC	96	static int read_madt;
78ed8bd2 AC	97	int apic_id = -1;
78ed8bd2 AC	98
149fe9c2 AC	99	if (!read_madt) {
	100	if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
	101	(struct acpi_table_header **)&madt)))
	102	madt = NULL;
	103	read_madt++;
	104	}
	105
78ed8bd2 AC	106	if (!madt)
	107	return apic_id;
	108
	109	entry = (unsigned long)madt;
	110	madt_end = entry + madt->header.length;
	111
	112	/* Parse all entries looking for a match. */
	113
	114	entry += sizeof(struct acpi_table_madt);
	115	while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
	116	struct acpi_subtable_header *header =
	117	(struct acpi_subtable_header *)entry;
	118	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
038d7b59	119	if (!map_lapic_id(header, acpi_id, &apic_id))
78ed8bd2 AC	120	break;
78ed8bd2 AC	121	} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
038d7b59	122	if (!map_x2apic_id(header, type, acpi_id, &apic_id))
78ed8bd2 AC	123	break;
78ed8bd2 AC	124	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
038d7b59	125	if (!map_lsapic_id(header, type, acpi_id, &apic_id))
78ed8bd2 AC	126	break;
	127	}
	128	entry += header->length;
	129	}
	130	return apic_id;
	131	}
	132
	133	static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
	134	{
	135	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	136	union acpi_object *obj;
	137	struct acpi_subtable_header *header;
	138	int apic_id = -1;
	139
	140	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
	141	goto exit;
	142
	143	if (!buffer.length \|\| !buffer.pointer)
	144	goto exit;
	145
	146	obj = buffer.pointer;
	147	if (obj->type != ACPI_TYPE_BUFFER \|\|
	148	obj->buffer.length < sizeof(struct acpi_subtable_header)) {
	149	goto exit;
	150	}
	151
	152	header = (struct acpi_subtable_header *)obj->buffer.pointer;
	153	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
	154	map_lapic_id(header, acpi_id, &apic_id);
	155	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
	156	map_lsapic_id(header, type, acpi_id, &apic_id);
	157	}
	158
	159	exit:
5273a258	160	kfree(buffer.pointer);
78ed8bd2 AC	161	return apic_id;
	162	}
	163
ca9f62ac	164	int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id)
78ed8bd2	165	{
ca9f62ac	166	int apic_id;
78ed8bd2 AC	167
	168	apic_id = map_mat_entry(handle, type, acpi_id);
	169	if (apic_id == -1)
	170	apic_id = map_madt_entry(type, acpi_id);
ca9f62ac JL	171
	172	return apic_id;
	173	}
	174
	175	int acpi_map_cpuid(int apic_id, u32 acpi_id)
	176	{
	177	#ifdef CONFIG_SMP
	178	int i;
	179	#endif
	180
d640113f LM	181	if (apic_id == -1) {
	182	/*
	183	* On UP processor, there is no _MAT or MADT table.
	184	* So above apic_id is always set to -1.
	185	*
	186	* BIOS may define multiple CPU handles even for UP processor.
	187	* For example,
	188	*
	189	* Scope (_PR)
	190	* {
	191	* Processor (CPU0, 0x00, 0x00000410, 0x06) {}
	192	* Processor (CPU1, 0x01, 0x00000410, 0x06) {}
	193	* Processor (CPU2, 0x02, 0x00000410, 0x06) {}
	194	* Processor (CPU3, 0x03, 0x00000410, 0x06) {}
	195	* }
	196	*
c4686c71 TR	197	* Ignores apic_id and always returns 0 for the processor
	198	* handle with acpi id 0 if nr_cpu_ids is 1.
	199	* This should be the case if SMP tables are not found.
d640113f LM	200	* Return -1 for other CPU's handle.
d640113f LM	201	*/
c4686c71	202	if (nr_cpu_ids <= 1 && acpi_id == 0)
d640113f LM	203	return acpi_id;
	204	else
	205	return apic_id;
	206	}
78ed8bd2	207
932df741	208	#ifdef CONFIG_SMP
78ed8bd2 AC	209	for_each_possible_cpu(i) {
	210	if (cpu_physical_id(i) == apic_id)
	211	return i;
	212	}
932df741 LM	213	#else
	214	/* In UP kernel, only processor 0 is valid */
	215	if (apic_id == 0)
	216	return apic_id;
	217	#endif
78ed8bd2 AC	218	return -1;
78ed8bd2 AC	219	}
ca9f62ac JL	220
	221	int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
	222	{
	223	int apic_id;
	224
	225	apic_id = acpi_get_apicid(handle, type, acpi_id);
	226
	227	return acpi_map_cpuid(apic_id, acpi_id);
	228	}
78ed8bd2	229	EXPORT_SYMBOL_GPL(acpi_get_cpuid);
78ed8bd2	230
6430c9c1	231	static bool __init processor_physically_present(acpi_handle handle)
5d554a7b AC	232	{
	233	int cpuid, type;
	234	u32 acpi_id;
	235	acpi_status status;
	236	acpi_object_type acpi_type;
	237	unsigned long long tmp;
	238	union acpi_object object = { 0 };
	239	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
	240
	241	status = acpi_get_type(handle, &acpi_type);
	242	if (ACPI_FAILURE(status))
	243	return false;
	244
	245	switch (acpi_type) {
	246	case ACPI_TYPE_PROCESSOR:
	247	status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
	248	if (ACPI_FAILURE(status))
	249	return false;
	250	acpi_id = object.processor.proc_id;
	251	break;
	252	case ACPI_TYPE_DEVICE:
	253	status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
	254	if (ACPI_FAILURE(status))
	255	return false;
	256	acpi_id = tmp;
	257	break;
	258	default:
	259	return false;
	260	}
	261
	262	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
	263	cpuid = acpi_get_cpuid(handle, type, acpi_id);
	264
932df741	265	if (cpuid == -1)
5d554a7b AC	266	return false;
	267
	268	return true;
	269	}
78ed8bd2	270
fe7bf106	271	static void acpi_set_pdc_bits(u32 *buf)
08ea48a3 AC	272	{
	273	buf[0] = ACPI_PDC_REVISION_ID;
	274	buf[1] = 1;
	275
	276	/* Enable coordination with firmware's _TSD info */
	277	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
6c5807d7 AC	278
	279	/* Twiddle arch-specific bits needed for _PDC */
	280	arch_acpi_set_pdc_bits(buf);
08ea48a3 AC	281	}
08ea48a3 AC	282
fe7bf106	283	static struct acpi_object_list *acpi_processor_alloc_pdc(void)
407cd87c AC	284	{
	285	struct acpi_object_list *obj_list;
	286	union acpi_object *obj;
	287	u32 *buf;
	288
407cd87c AC	289	/* allocate and initialize pdc. It will be used later. */
	290	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	291	if (!obj_list) {
	292	printk(KERN_ERR "Memory allocation error\n");
3b407aef	293	return NULL;
407cd87c AC	294	}
	295
	296	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	297	if (!obj) {
	298	printk(KERN_ERR "Memory allocation error\n");
	299	kfree(obj_list);
3b407aef	300	return NULL;
407cd87c AC	301	}
	302
	303	buf = kmalloc(12, GFP_KERNEL);
	304	if (!buf) {
	305	printk(KERN_ERR "Memory allocation error\n");
	306	kfree(obj);
	307	kfree(obj_list);
3b407aef	308	return NULL;
407cd87c AC	309	}
407cd87c AC	310
08ea48a3 AC	311	acpi_set_pdc_bits(buf);
08ea48a3 AC	312
407cd87c AC	313	obj->type = ACPI_TYPE_BUFFER;
	314	obj->buffer.length = 12;
	315	obj->buffer.pointer = (u8 *) buf;
	316	obj_list->count = 1;
	317	obj_list->pointer = obj;
407cd87c	318
3b407aef	319	return obj_list;
407cd87c AC	320	}
407cd87c AC	321
78f16996 AC	322	/*
	323	* _PDC is required for a BIOS-OS handshake for most of the newer
	324	* ACPI processor features.
	325	*/
1606484e	326	static acpi_status
fa118564	327	acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
78f16996	328	{
78f16996 AC	329	acpi_status status = AE_OK;
78f16996 AC	330
d1896049	331	if (boot_option_idle_override == IDLE_NOMWAIT) {
78f16996 AC	332	/*
	333	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	334	* mode will be disabled in the parameter of _PDC object.
	335	* Of course C1_FFH access mode will also be disabled.
	336	*/
	337	union acpi_object *obj;
	338	u32 *buffer = NULL;
	339
	340	obj = pdc_in->pointer;
	341	buffer = (u32 *)(obj->buffer.pointer);
	342	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	343
	344	}
fa118564	345	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
78f16996 AC	346
	347	if (ACPI_FAILURE(status))
	348	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	349	"Could not evaluate _PDC, using legacy perf. control.\n"));
	350
	351	return status;
	352	}
	353
fe7bf106	354	void acpi_processor_set_pdc(acpi_handle handle)
78f16996	355	{
3b407aef AC	356	struct acpi_object_list *obj_list;
3b407aef AC	357
1d9cb470 AC	358	if (arch_has_acpi_pdc() == false)
	359	return;
	360
3b407aef AC	361	obj_list = acpi_processor_alloc_pdc();
	362	if (!obj_list)
	363	return;
	364
43bab25c	365	acpi_processor_eval_pdc(handle, obj_list);
b9c2db78 AC	366
	367	kfree(obj_list->pointer->buffer.pointer);
	368	kfree(obj_list->pointer);
	369	kfree(obj_list);
78f16996	370	}
78f16996	371
6430c9c1	372	static acpi_status __init
78f16996 AC	373	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
78f16996 AC	374	{
5d554a7b AC	375	if (processor_physically_present(handle) == false)
	376	return AE_OK;
	377
43bab25c	378	acpi_processor_set_pdc(handle);
78f16996 AC	379	return AE_OK;
	380	}
	381
7a0b73a4	382	void __init acpi_early_processor_set_pdc(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);
	389
	390	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	391	ACPI_UINT32_MAX,
	392	early_init_pdc, NULL, NULL, NULL);
52056925	393	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
78f16996	394	}