/* * 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 <linux/slab.h> #include <acpi/acpi_drivers.h>#include <acpi/processor.h> #include "internal.h" #define PREFIX			"ACPI: "#define _COMPONENT		ACPI_PROCESSOR_COMPONENTACPI_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)		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 __cpuinitacpi_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 __initearly_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);}