[net-next-2.6.git] / drivers / acpi / processor_pdc.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/dmi.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_pdc");

static int set_no_mwait(const struct dmi_system_id *id)
{
	printk(KERN_NOTICE PREFIX "%s detected - "
		"disabling mwait for CPU C-states\n", id->ident);
	idle_nomwait = 1;
	return 0;
}

static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
	{
	set_no_mwait, "IFL91 board", {
	DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
	DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
	DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
	DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
	{
	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 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(struct acpi_processor *pr)
{
	struct acpi_object_list *pdc_in = pr->pdc;
	acpi_status status = AE_OK;

	if (!pdc_in)
		return status;
	if (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(pr->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;
}

static void acpi_processor_cleanup_pdc(struct acpi_processor *pr)
{
	if (pr->pdc) {
		kfree(pr->pdc->pointer->buffer.pointer);
		kfree(pr->pdc->pointer);
		kfree(pr->pdc);
		pr->pdc = NULL;
	}
}

void acpi_processor_set_pdc(struct acpi_processor *pr)
{
	struct acpi_object_list *obj_list;

	if (arch_has_acpi_pdc() == false)
		return;

	obj_list = acpi_processor_alloc_pdc();
	if (!obj_list)
		return;

	pr->pdc = obj_list;

	acpi_processor_eval_pdc(pr);
	acpi_processor_cleanup_pdc(pr);
}
EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);

static acpi_status
early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	struct acpi_processor pr;

	pr.handle = handle;

	/* x86 implementation looks at pr.id to determine some
	 * CPU capabilites. We can just hard code to 0 since we're
	 * assuming the CPUs in the system are homogenous and all
	 * have the same capabilities.
	 */
	pr.id = 0;

	acpi_processor_set_pdc(&pr);

	return AE_OK;
}

void 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);
}
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	*/
78f16996 AC	10	#include <linux/dmi.h>
	11
	12	#include <acpi/acpi_drivers.h>
	13	#include <acpi/processor.h>
	14
	15	#include "internal.h"
	16
	17	#define PREFIX "ACPI: "
	18	#define _COMPONENT ACPI_PROCESSOR_COMPONENT
	19	ACPI_MODULE_NAME("processor_pdc");
	20
	21	static int set_no_mwait(const struct dmi_system_id *id)
	22	{
	23	printk(KERN_NOTICE PREFIX "%s detected - "
	24	"disabling mwait for CPU C-states\n", id->ident);
	25	idle_nomwait = 1;
	26	return 0;
	27	}
	28
	29	static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
	30	{
	31	set_no_mwait, "IFL91 board", {
	32	DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
	33	DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
	34	DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
	35	DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
	36	{
	37	set_no_mwait, "Extensa 5220", {
	38	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
	39	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	40	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
	41	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
	42	{},
	43	};
	44
08ea48a3 AC	45	static void acpi_set_pdc_bits(u32 *buf)
	46	{
	47	buf[0] = ACPI_PDC_REVISION_ID;
	48	buf[1] = 1;
	49
	50	/* Enable coordination with firmware's _TSD info */
	51	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
6c5807d7 AC	52
	53	/* Twiddle arch-specific bits needed for _PDC */
	54	arch_acpi_set_pdc_bits(buf);
08ea48a3 AC	55	}
08ea48a3 AC	56
3b407aef	57	static struct acpi_object_list *acpi_processor_alloc_pdc(void)
407cd87c AC	58	{
	59	struct acpi_object_list *obj_list;
	60	union acpi_object *obj;
	61	u32 *buf;
	62
407cd87c AC	63	/* allocate and initialize pdc. It will be used later. */
	64	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
	65	if (!obj_list) {
	66	printk(KERN_ERR "Memory allocation error\n");
3b407aef	67	return NULL;
407cd87c AC	68	}
	69
	70	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
	71	if (!obj) {
	72	printk(KERN_ERR "Memory allocation error\n");
	73	kfree(obj_list);
3b407aef	74	return NULL;
407cd87c AC	75	}
	76
	77	buf = kmalloc(12, GFP_KERNEL);
	78	if (!buf) {
	79	printk(KERN_ERR "Memory allocation error\n");
	80	kfree(obj);
	81	kfree(obj_list);
3b407aef	82	return NULL;
407cd87c AC	83	}
407cd87c AC	84
08ea48a3 AC	85	acpi_set_pdc_bits(buf);
08ea48a3 AC	86
407cd87c AC	87	obj->type = ACPI_TYPE_BUFFER;
	88	obj->buffer.length = 12;
	89	obj->buffer.pointer = (u8 *) buf;
	90	obj_list->count = 1;
	91	obj_list->pointer = obj;
407cd87c	92
3b407aef	93	return obj_list;
407cd87c AC	94	}
407cd87c AC	95
78f16996 AC	96	/*
	97	* _PDC is required for a BIOS-OS handshake for most of the newer
	98	* ACPI processor features.
	99	*/
	100	static int acpi_processor_eval_pdc(struct acpi_processor *pr)
	101	{
	102	struct acpi_object_list *pdc_in = pr->pdc;
	103	acpi_status status = AE_OK;
	104
	105	if (!pdc_in)
	106	return status;
	107	if (idle_nomwait) {
	108	/*
	109	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	110	* mode will be disabled in the parameter of _PDC object.
	111	* Of course C1_FFH access mode will also be disabled.
	112	*/
	113	union acpi_object *obj;
	114	u32 *buffer = NULL;
	115
	116	obj = pdc_in->pointer;
	117	buffer = (u32 *)(obj->buffer.pointer);
	118	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	119
	120	}
	121	status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
	122
	123	if (ACPI_FAILURE(status))
	124	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	125	"Could not evaluate _PDC, using legacy perf. control.\n"));
	126
	127	return status;
	128	}
	129
47817254 AC	130	static void acpi_processor_cleanup_pdc(struct acpi_processor *pr)
	131	{
	132	if (pr->pdc) {
	133	kfree(pr->pdc->pointer->buffer.pointer);
	134	kfree(pr->pdc->pointer);
	135	kfree(pr->pdc);
	136	pr->pdc = NULL;
	137	}
	138	}
	139
78f16996 AC	140	void acpi_processor_set_pdc(struct acpi_processor *pr)
78f16996 AC	141	{
3b407aef AC	142	struct acpi_object_list *obj_list;
3b407aef AC	143
1d9cb470 AC	144	if (arch_has_acpi_pdc() == false)
	145	return;
	146
3b407aef AC	147	obj_list = acpi_processor_alloc_pdc();
	148	if (!obj_list)
	149	return;
	150
	151	pr->pdc = obj_list;
	152
78f16996	153	acpi_processor_eval_pdc(pr);
47817254	154	acpi_processor_cleanup_pdc(pr);
78f16996 AC	155	}
	156	EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
	157
	158	static acpi_status
	159	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
	160	{
	161	struct acpi_processor pr;
	162
	163	pr.handle = handle;
	164
	165	/* x86 implementation looks at pr.id to determine some
	166	* CPU capabilites. We can just hard code to 0 since we're
	167	* assuming the CPUs in the system are homogenous and all
	168	* have the same capabilities.
	169	*/
	170	pr.id = 0;
	171
	172	acpi_processor_set_pdc(&pr);
	173
	174	return AE_OK;
	175	}
	176
	177	void acpi_early_processor_set_pdc(void)
	178	{
	179	/*
	180	* Check whether the system is DMI table. If yes, OSPM
	181	* should not use mwait for CPU-states.
	182	*/
	183	dmi_check_system(processor_idle_dmi_table);
	184
	185	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	186	ACPI_UINT32_MAX,
	187	early_init_pdc, NULL, NULL, NULL);
	188	}