[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 <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 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 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:
	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 int
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("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
8ef9fc78	31	static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
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:
5273a258	161	kfree(buffer.pointer);
78ed8bd2 AC	162	return apic_id;
	163	}
	164
ca9f62ac	165	int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id)
78ed8bd2	166	{
ca9f62ac	167	int apic_id;
78ed8bd2 AC	168
	169	apic_id = map_mat_entry(handle, type, acpi_id);
	170	if (apic_id == -1)
	171	apic_id = map_madt_entry(type, acpi_id);
ca9f62ac JL	172
	173	return apic_id;
	174	}
	175
	176	int acpi_map_cpuid(int apic_id, u32 acpi_id)
	177	{
	178	#ifdef CONFIG_SMP
	179	int i;
	180	#endif
	181
d640113f LM	182	if (apic_id == -1) {
	183	/*
	184	* On UP processor, there is no _MAT or MADT table.
	185	* So above apic_id is always set to -1.
	186	*
	187	* BIOS may define multiple CPU handles even for UP processor.
	188	* For example,
	189	*
	190	* Scope (_PR)
	191	* {
	192	* Processor (CPU0, 0x00, 0x00000410, 0x06) {}
	193	* Processor (CPU1, 0x01, 0x00000410, 0x06) {}
	194	* Processor (CPU2, 0x02, 0x00000410, 0x06) {}
	195	* Processor (CPU3, 0x03, 0x00000410, 0x06) {}
	196	* }
	197	*
c4686c71 TR	198	* Ignores apic_id and always returns 0 for the processor
	199	* handle with acpi id 0 if nr_cpu_ids is 1.
	200	* This should be the case if SMP tables are not found.
d640113f LM	201	* Return -1 for other CPU's handle.
d640113f LM	202	*/
c4686c71	203	if (nr_cpu_ids <= 1 && acpi_id == 0)
d640113f LM	204	return acpi_id;
	205	else
	206	return apic_id;
	207	}
78ed8bd2	208
932df741	209	#ifdef CONFIG_SMP
78ed8bd2 AC	210	for_each_possible_cpu(i) {
	211	if (cpu_physical_id(i) == apic_id)
	212	return i;
	213	}
932df741 LM	214	#else
	215	/* In UP kernel, only processor 0 is valid */
	216	if (apic_id == 0)
	217	return apic_id;
	218	#endif
78ed8bd2 AC	219	return -1;
78ed8bd2 AC	220	}
ca9f62ac JL	221
	222	int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
	223	{
	224	int apic_id;
	225
	226	apic_id = acpi_get_apicid(handle, type, acpi_id);
	227
	228	return acpi_map_cpuid(apic_id, acpi_id);
	229	}
78ed8bd2	230	EXPORT_SYMBOL_GPL(acpi_get_cpuid);
78ed8bd2	231
6430c9c1	232	static bool __init processor_physically_present(acpi_handle handle)
5d554a7b AC	233	{
	234	int cpuid, type;
	235	u32 acpi_id;
	236	acpi_status status;
	237	acpi_object_type acpi_type;
	238	unsigned long long tmp;
	239	union acpi_object object = { 0 };
	240	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
	241
	242	status = acpi_get_type(handle, &acpi_type);
	243	if (ACPI_FAILURE(status))
	244	return false;
	245
	246	switch (acpi_type) {
	247	case ACPI_TYPE_PROCESSOR:
	248	status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
	249	if (ACPI_FAILURE(status))
	250	return false;
	251	acpi_id = object.processor.proc_id;
	252	break;
	253	case ACPI_TYPE_DEVICE:
	254	status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
	255	if (ACPI_FAILURE(status))
	256	return false;
	257	acpi_id = tmp;
	258	break;
	259	default:
	260	return false;
	261	}
	262
	263	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
	264	cpuid = acpi_get_cpuid(handle, type, acpi_id);
	265
932df741	266	if (cpuid == -1)
5d554a7b AC	267	return false;
	268
	269	return true;
	270	}
78ed8bd2	271
fe7bf106	272	static void acpi_set_pdc_bits(u32 *buf)
08ea48a3 AC	273	{
	274	buf[0] = ACPI_PDC_REVISION_ID;
	275	buf[1] = 1;
	276
	277	/* Enable coordination with firmware's _TSD info */
	278	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
6c5807d7 AC	279
	280	/* Twiddle arch-specific bits needed for _PDC */
	281	arch_acpi_set_pdc_bits(buf);
08ea48a3 AC	282	}
08ea48a3 AC	283
fe7bf106	284	static struct acpi_object_list *acpi_processor_alloc_pdc(void)
407cd87c AC	285	{
	286	struct acpi_object_list *obj_list;
	287	union acpi_object *obj;
	288	u32 *buf;
	289
407cd87c AC	290	/* allocate and initialize pdc. It will be used later. */
	291	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	292	if (!obj_list) {
	293	printk(KERN_ERR "Memory allocation error\n");
3b407aef	294	return NULL;
407cd87c AC	295	}
	296
	297	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	298	if (!obj) {
	299	printk(KERN_ERR "Memory allocation error\n");
	300	kfree(obj_list);
3b407aef	301	return NULL;
407cd87c AC	302	}
	303
	304	buf = kmalloc(12, GFP_KERNEL);
	305	if (!buf) {
	306	printk(KERN_ERR "Memory allocation error\n");
	307	kfree(obj);
	308	kfree(obj_list);
3b407aef	309	return NULL;
407cd87c AC	310	}
407cd87c AC	311
08ea48a3 AC	312	acpi_set_pdc_bits(buf);
08ea48a3 AC	313
407cd87c AC	314	obj->type = ACPI_TYPE_BUFFER;
	315	obj->buffer.length = 12;
	316	obj->buffer.pointer = (u8 *) buf;
	317	obj_list->count = 1;
	318	obj_list->pointer = obj;
407cd87c	319
3b407aef	320	return obj_list;
407cd87c AC	321	}
407cd87c AC	322
78f16996 AC	323	/*
	324	* _PDC is required for a BIOS-OS handshake for most of the newer
	325	* ACPI processor features.
	326	*/
fe7bf106	327	static int
fa118564	328	acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
78f16996	329	{
78f16996 AC	330	acpi_status status = AE_OK;
78f16996 AC	331
d1896049	332	if (boot_option_idle_override == IDLE_NOMWAIT) {
78f16996 AC	333	/*
	334	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	335	* mode will be disabled in the parameter of _PDC object.
	336	* Of course C1_FFH access mode will also be disabled.
	337	*/
	338	union acpi_object *obj;
	339	u32 *buffer = NULL;
	340
	341	obj = pdc_in->pointer;
	342	buffer = (u32 *)(obj->buffer.pointer);
	343	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	344
	345	}
fa118564	346	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
78f16996 AC	347
	348	if (ACPI_FAILURE(status))
	349	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	350	"Could not evaluate _PDC, using legacy perf. control.\n"));
	351
	352	return status;
	353	}
	354
fe7bf106	355	void acpi_processor_set_pdc(acpi_handle handle)
78f16996	356	{
3b407aef AC	357	struct acpi_object_list *obj_list;
3b407aef AC	358
1d9cb470 AC	359	if (arch_has_acpi_pdc() == false)
	360	return;
	361
3b407aef AC	362	obj_list = acpi_processor_alloc_pdc();
	363	if (!obj_list)
	364	return;
	365
43bab25c	366	acpi_processor_eval_pdc(handle, obj_list);
b9c2db78 AC	367
	368	kfree(obj_list->pointer->buffer.pointer);
	369	kfree(obj_list->pointer);
	370	kfree(obj_list);
78f16996	371	}
78f16996	372
6430c9c1	373	static acpi_status __init
78f16996 AC	374	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
78f16996 AC	375	{
5d554a7b AC	376	if (processor_physically_present(handle) == false)
	377	return AE_OK;
	378
43bab25c	379	acpi_processor_set_pdc(handle);
78f16996 AC	380	return AE_OK;
	381	}
	382
7a0b73a4	383	void __init acpi_early_processor_set_pdc(void)
78f16996 AC	384	{
	385	/*
	386	* Check whether the system is DMI table. If yes, OSPM
	387	* should not use mwait for CPU-states.
	388	*/
	389	dmi_check_system(processor_idle_dmi_table);
	390
	391	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	392	ACPI_UINT32_MAX,
	393	early_init_pdc, NULL, NULL, NULL);
c1e0ddbf	394	acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
78f16996	395	}