/* * Copyright (C) 2005 Intel Corporation * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. * *	Alex Chiang <achiang@hp.com> *	- Unified x86/ia64 implementations * * I/O APIC hotplug support *	Yinghai Lu <yinghai@kernel.org> *	Jiang Liu <jiang.liu@intel.com> */#include <linux/export.h>#include <linux/acpi.h>#include <acpi/processor.h> #define _COMPONENT		ACPI_PROCESSOR_COMPONENTACPI_MODULE_NAME("processor_core"); static struct acpi_table_madt *get_madt_table(void){	static struct acpi_table_madt *madt;	static int read_madt; 	if (!read_madt) {		if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,					(struct acpi_table_header **)&madt)))			madt = NULL;		read_madt++;	} 	return madt;} static int map_lapic_id(struct acpi_subtable_header *entry,		 u32 acpi_id, phys_cpuid_t *apic_id){	struct acpi_madt_local_apic *lapic =		container_of(entry, struct acpi_madt_local_apic, header); 	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, phys_cpuid_t *apic_id){	struct acpi_madt_local_x2apic *apic =		container_of(entry, struct acpi_madt_local_x2apic, header); 	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, phys_cpuid_t *apic_id){	struct acpi_madt_local_sapic *lsapic =		container_of(entry, struct acpi_madt_local_sapic, header); 	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;} /* * Retrieve the ARM CPU physical identifier (MPIDR) */static int map_gicc_mpidr(struct acpi_subtable_header *entry,		int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr){	struct acpi_madt_generic_interrupt *gicc =	    container_of(entry, struct acpi_madt_generic_interrupt, header); 	if (!(gicc->flags & ACPI_MADT_ENABLED))		return -ENODEV; 	/* device_declaration means Device object in DSDT, in the	 * GIC interrupt model, logical processors are required to	 * have a Processor Device object in the DSDT, so we should	 * check device_declaration here	 */	if (device_declaration && (gicc->uid == acpi_id)) {		*mpidr = gicc->arm_mpidr;		return 0;	} 	return -EINVAL;} static phys_cpuid_t map_madt_entry(int type, u32 acpi_id){	unsigned long madt_end, entry;	phys_cpuid_t phys_id = PHYS_CPUID_INVALID;	/* CPU hardware ID */	struct acpi_table_madt *madt; 	madt = get_madt_table();	if (!madt)		return phys_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, &phys_id))				break;		} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {			if (!map_x2apic_id(header, type, acpi_id, &phys_id))				break;		} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {			if (!map_lsapic_id(header, type, acpi_id, &phys_id))				break;		} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {			if (!map_gicc_mpidr(header, type, acpi_id, &phys_id))				break;		}		entry += header->length;	}	return phys_id;} static phys_cpuid_t 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;	phys_cpuid_t phys_id = PHYS_CPUID_INVALID; 	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, &phys_id);	else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)		map_lsapic_id(header, type, acpi_id, &phys_id);	else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)		map_x2apic_id(header, type, acpi_id, &phys_id);	else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)		map_gicc_mpidr(header, type, acpi_id, &phys_id); exit:	kfree(buffer.pointer);	return phys_id;} phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id){	phys_cpuid_t phys_id; 	phys_id = map_mat_entry(handle, type, acpi_id);	if (phys_id == PHYS_CPUID_INVALID)		phys_id = map_madt_entry(type, acpi_id); 	return phys_id;} int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id){#ifdef CONFIG_SMP	int i;#endif 	if (phys_id == PHYS_CPUID_INVALID) {		/*		 * On UP processor, there is no _MAT or MADT table.		 * So above phys_id is always set to PHYS_CPUID_INVALID.		 *		 * 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 phys_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 -1;	} #ifdef CONFIG_SMP	for_each_possible_cpu(i) {		if (cpu_physical_id(i) == phys_id)			return i;	}#else	/* In UP kernel, only processor 0 is valid */	if (phys_id == 0)		return phys_id;#endif	return -1;} int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id){	phys_cpuid_t phys_id; 	phys_id = acpi_get_phys_id(handle, type, acpi_id); 	return acpi_map_cpuid(phys_id, acpi_id);}EXPORT_SYMBOL_GPL(acpi_get_cpuid); #ifdef CONFIG_ACPI_HOTPLUG_IOAPICstatic int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,			 u64 *phys_addr, int *ioapic_id){	struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; 	if (ioapic->global_irq_base != gsi_base)		return 0; 	*phys_addr = ioapic->address;	*ioapic_id = ioapic->id;	return 1;} static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr){	struct acpi_subtable_header *hdr;	unsigned long madt_end, entry;	struct acpi_table_madt *madt;	int apic_id = -1; 	madt = get_madt_table();	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) {		hdr = (struct acpi_subtable_header *)entry;		if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&		    get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))			break;		else			entry += hdr->length;	} 	return apic_id;} static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,				  u64 *phys_addr){	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };	struct acpi_subtable_header *header;	union acpi_object *obj;	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_IO_APIC)		get_ioapic_id(header, gsi_base, phys_addr, &apic_id); exit:	kfree(buffer.pointer);	return apic_id;} /** * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base * @handle:	ACPI object for IOAPIC device * @gsi_base:	GSI base to match with * @phys_addr:	Pointer to store physical address of matching IOAPIC record * * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search * for an ACPI IOAPIC record matching @gsi_base. * Return IOAPIC id and store physical address in @phys_addr if found a match, * otherwise return <0. */int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr){	int apic_id; 	apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);	if (apic_id == -1)		apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr); 	return apic_id;}#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */