[net-next-2.6.git] / drivers / acpi / processor_pdc.c

#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},
	{},
};

/*
 * _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;
}

void acpi_processor_set_pdc(struct acpi_processor *pr)
{
	if (arch_has_acpi_pdc() == false)
		return;

	arch_acpi_processor_init_pdc(pr);
	acpi_processor_eval_pdc(pr);
	arch_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
78f16996 AC	1	#include <linux/dmi.h>
	2
	3	#include <acpi/acpi_drivers.h>
	4	#include <acpi/processor.h>
	5
	6	#include "internal.h"
	7
	8	#define PREFIX "ACPI: "
	9	#define _COMPONENT ACPI_PROCESSOR_COMPONENT
	10	ACPI_MODULE_NAME("processor_pdc");
	11
	12	static int set_no_mwait(const struct dmi_system_id *id)
	13	{
	14	printk(KERN_NOTICE PREFIX "%s detected - "
	15	"disabling mwait for CPU C-states\n", id->ident);
	16	idle_nomwait = 1;
	17	return 0;
	18	}
	19
	20	static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
	21	{
	22	set_no_mwait, "IFL91 board", {
	23	DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
	24	DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
	25	DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
	26	DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
	27	{
	28	set_no_mwait, "Extensa 5220", {
	29	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
	30	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
	31	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
	32	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
	33	{},
	34	};
	35
	36	/*
	37	* _PDC is required for a BIOS-OS handshake for most of the newer
	38	* ACPI processor features.
	39	*/
	40	static int acpi_processor_eval_pdc(struct acpi_processor *pr)
	41	{
	42	struct acpi_object_list *pdc_in = pr->pdc;
	43	acpi_status status = AE_OK;
	44
	45	if (!pdc_in)
	46	return status;
	47	if (idle_nomwait) {
	48	/*
	49	* If mwait is disabled for CPU C-states, the C2C3_FFH access
	50	* mode will be disabled in the parameter of _PDC object.
	51	* Of course C1_FFH access mode will also be disabled.
	52	*/
	53	union acpi_object *obj;
	54	u32 *buffer = NULL;
	55
	56	obj = pdc_in->pointer;
	57	buffer = (u32 *)(obj->buffer.pointer);
	58	buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH \| ACPI_PDC_C_C1_FFH);
	59
	60	}
	61	status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
	62
	63	if (ACPI_FAILURE(status))
	64	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
65	"Could not evaluate _PDC, using legacy perf. control.\n"));
66
67	return status;
68	}
69
70	void acpi_processor_set_pdc(struct acpi_processor *pr)
71	{
1d9cb470 AC	72	if (arch_has_acpi_pdc() == false)
	73	return;
	74
78f16996 AC	75	arch_acpi_processor_init_pdc(pr);
	76	acpi_processor_eval_pdc(pr);
	77	arch_acpi_processor_cleanup_pdc(pr);
	78	}
	79	EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
	80
	81	static acpi_status
	82	early_init_pdc(acpi_handle handle, u32 lvl, void context, void *rv)
	83	{
	84	struct acpi_processor pr;
	85
	86	pr.handle = handle;
	87
	88	/* x86 implementation looks at pr.id to determine some
	89	* CPU capabilites. We can just hard code to 0 since we're
	90	* assuming the CPUs in the system are homogenous and all
	91	* have the same capabilities.
	92	*/
	93	pr.id = 0;
	94
	95	acpi_processor_set_pdc(&pr);
	96
	97	return AE_OK;
	98	}
	99
	100	void acpi_early_processor_set_pdc(void)
	101	{
	102	/*
	103	* Check whether the system is DMI table. If yes, OSPM
	104	* should not use mwait for CPU-states.
	105	*/
	106	dmi_check_system(processor_idle_dmi_table);
	107
	108	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
	109	ACPI_UINT32_MAX,
	110	early_init_pdc, NULL, NULL, NULL);
	111	}