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processor_core.c
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processor_core.c
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/* * Copyright (C) 2005 Intel Corporation * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. * * Alex Chiang <achiang@hp.com> * - Unified x86/ia64 implementations */ #include <linux/export.h> #include <linux/acpi.h> #include <acpi/processor.h> #define _COMPONENT ACPI_PROCESSOR_COMPONENT ACPI_MODULE_NAME("processor_core"); 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 -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, int *apic_id) { struct acpi_madt_local_x2apic *apic = (struct acpi_madt_local_x2apic *)entry; 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, int *apic_id) { struct acpi_madt_local_sapic *lsapic = (struct acpi_madt_local_sapic *)entry; 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; } 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); } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { map_x2apic_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);
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