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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 * 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_COMPONENT ACPI_MODULE_NAME("processor_core"); 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}, {}, }; #ifdef CONFIG_SMP 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) { int i; 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; for_each_possible_cpu(i) { if (cpu_physical_id(i) == apic_id) return i; } return -1; } EXPORT_SYMBOL_GPL(acpi_get_cpuid); #endif static bool 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) && (num_possible_cpus() > 1)) return false; return true; } 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(acpi_handle handle, struct acpi_object_list *pdc_in) { acpi_status status = AE_OK; 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(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(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); } EXPORT_SYMBOL_GPL(acpi_processor_set_pdc); static acpi_status early_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); }
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