146ba51eaSHanjun Guo /* 246ba51eaSHanjun Guo * Copyright (C) 2005 Intel Corporation 346ba51eaSHanjun Guo * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. 446ba51eaSHanjun Guo * 546ba51eaSHanjun Guo * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> 646ba51eaSHanjun Guo * - Added _PDC for platforms with Intel CPUs 746ba51eaSHanjun Guo */ 846ba51eaSHanjun Guo 946ba51eaSHanjun Guo #define pr_fmt(fmt) "ACPI: " fmt 1046ba51eaSHanjun Guo 1146ba51eaSHanjun Guo #include <linux/dmi.h> 1246ba51eaSHanjun Guo #include <linux/slab.h> 1346ba51eaSHanjun Guo #include <linux/acpi.h> 1446ba51eaSHanjun Guo #include <acpi/processor.h> 1546ba51eaSHanjun Guo 1646ba51eaSHanjun Guo #include "internal.h" 1746ba51eaSHanjun Guo 1846ba51eaSHanjun Guo #define _COMPONENT ACPI_PROCESSOR_COMPONENT 1946ba51eaSHanjun Guo ACPI_MODULE_NAME("processor_pdc"); 2046ba51eaSHanjun Guo 2146ba51eaSHanjun Guo static bool __init processor_physically_present(acpi_handle handle) 2246ba51eaSHanjun Guo { 2346ba51eaSHanjun Guo int cpuid, type; 2446ba51eaSHanjun Guo u32 acpi_id; 2546ba51eaSHanjun Guo acpi_status status; 2646ba51eaSHanjun Guo acpi_object_type acpi_type; 2746ba51eaSHanjun Guo unsigned long long tmp; 2846ba51eaSHanjun Guo union acpi_object object = { 0 }; 2946ba51eaSHanjun Guo struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 3046ba51eaSHanjun Guo 3146ba51eaSHanjun Guo status = acpi_get_type(handle, &acpi_type); 3246ba51eaSHanjun Guo if (ACPI_FAILURE(status)) 3346ba51eaSHanjun Guo return false; 3446ba51eaSHanjun Guo 3546ba51eaSHanjun Guo switch (acpi_type) { 3646ba51eaSHanjun Guo case ACPI_TYPE_PROCESSOR: 3746ba51eaSHanjun Guo status = acpi_evaluate_object(handle, NULL, NULL, &buffer); 3846ba51eaSHanjun Guo if (ACPI_FAILURE(status)) 3946ba51eaSHanjun Guo return false; 4046ba51eaSHanjun Guo acpi_id = object.processor.proc_id; 4146ba51eaSHanjun Guo break; 4246ba51eaSHanjun Guo case ACPI_TYPE_DEVICE: 4346ba51eaSHanjun Guo status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); 4446ba51eaSHanjun Guo if (ACPI_FAILURE(status)) 4546ba51eaSHanjun Guo return false; 4646ba51eaSHanjun Guo acpi_id = tmp; 4746ba51eaSHanjun Guo break; 4846ba51eaSHanjun Guo default: 4946ba51eaSHanjun Guo return false; 5046ba51eaSHanjun Guo } 5146ba51eaSHanjun Guo 5246ba51eaSHanjun Guo type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; 5346ba51eaSHanjun Guo cpuid = acpi_get_cpuid(handle, type, acpi_id); 5446ba51eaSHanjun Guo 5525956b66SHanjun Guo return !invalid_logical_cpuid(cpuid); 5646ba51eaSHanjun Guo } 5746ba51eaSHanjun Guo 5846ba51eaSHanjun Guo static void acpi_set_pdc_bits(u32 *buf) 5946ba51eaSHanjun Guo { 6046ba51eaSHanjun Guo buf[0] = ACPI_PDC_REVISION_ID; 6146ba51eaSHanjun Guo buf[1] = 1; 6246ba51eaSHanjun Guo 6346ba51eaSHanjun Guo /* Enable coordination with firmware's _TSD info */ 6446ba51eaSHanjun Guo buf[2] = ACPI_PDC_SMP_T_SWCOORD; 6546ba51eaSHanjun Guo 6646ba51eaSHanjun Guo /* Twiddle arch-specific bits needed for _PDC */ 6746ba51eaSHanjun Guo arch_acpi_set_pdc_bits(buf); 6846ba51eaSHanjun Guo } 6946ba51eaSHanjun Guo 7046ba51eaSHanjun Guo static struct acpi_object_list *acpi_processor_alloc_pdc(void) 7146ba51eaSHanjun Guo { 7246ba51eaSHanjun Guo struct acpi_object_list *obj_list; 7346ba51eaSHanjun Guo union acpi_object *obj; 7446ba51eaSHanjun Guo u32 *buf; 7546ba51eaSHanjun Guo 7646ba51eaSHanjun Guo /* allocate and initialize pdc. It will be used later. */ 7746ba51eaSHanjun Guo obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); 7846ba51eaSHanjun Guo if (!obj_list) 7946ba51eaSHanjun Guo goto out; 8046ba51eaSHanjun Guo 8146ba51eaSHanjun Guo obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); 8246ba51eaSHanjun Guo if (!obj) { 8346ba51eaSHanjun Guo kfree(obj_list); 8446ba51eaSHanjun Guo goto out; 8546ba51eaSHanjun Guo } 8646ba51eaSHanjun Guo 8746ba51eaSHanjun Guo buf = kmalloc(12, GFP_KERNEL); 8846ba51eaSHanjun Guo if (!buf) { 8946ba51eaSHanjun Guo kfree(obj); 9046ba51eaSHanjun Guo kfree(obj_list); 9146ba51eaSHanjun Guo goto out; 9246ba51eaSHanjun Guo } 9346ba51eaSHanjun Guo 9446ba51eaSHanjun Guo acpi_set_pdc_bits(buf); 9546ba51eaSHanjun Guo 9646ba51eaSHanjun Guo obj->type = ACPI_TYPE_BUFFER; 9746ba51eaSHanjun Guo obj->buffer.length = 12; 9846ba51eaSHanjun Guo obj->buffer.pointer = (u8 *) buf; 9946ba51eaSHanjun Guo obj_list->count = 1; 10046ba51eaSHanjun Guo obj_list->pointer = obj; 10146ba51eaSHanjun Guo 10246ba51eaSHanjun Guo return obj_list; 10346ba51eaSHanjun Guo out: 10446ba51eaSHanjun Guo pr_err("Memory allocation error\n"); 10546ba51eaSHanjun Guo return NULL; 10646ba51eaSHanjun Guo } 10746ba51eaSHanjun Guo 10846ba51eaSHanjun Guo /* 10946ba51eaSHanjun Guo * _PDC is required for a BIOS-OS handshake for most of the newer 11046ba51eaSHanjun Guo * ACPI processor features. 11146ba51eaSHanjun Guo */ 11246ba51eaSHanjun Guo static acpi_status 11346ba51eaSHanjun Guo acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) 11446ba51eaSHanjun Guo { 11546ba51eaSHanjun Guo acpi_status status = AE_OK; 11646ba51eaSHanjun Guo 11746ba51eaSHanjun Guo if (boot_option_idle_override == IDLE_NOMWAIT) { 11846ba51eaSHanjun Guo /* 11946ba51eaSHanjun Guo * If mwait is disabled for CPU C-states, the C2C3_FFH access 12046ba51eaSHanjun Guo * mode will be disabled in the parameter of _PDC object. 12146ba51eaSHanjun Guo * Of course C1_FFH access mode will also be disabled. 12246ba51eaSHanjun Guo */ 12346ba51eaSHanjun Guo union acpi_object *obj; 12446ba51eaSHanjun Guo u32 *buffer = NULL; 12546ba51eaSHanjun Guo 12646ba51eaSHanjun Guo obj = pdc_in->pointer; 12746ba51eaSHanjun Guo buffer = (u32 *)(obj->buffer.pointer); 12846ba51eaSHanjun Guo buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); 12946ba51eaSHanjun Guo 13046ba51eaSHanjun Guo } 13146ba51eaSHanjun Guo status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); 13246ba51eaSHanjun Guo 13346ba51eaSHanjun Guo if (ACPI_FAILURE(status)) 13446ba51eaSHanjun Guo ACPI_DEBUG_PRINT((ACPI_DB_INFO, 13546ba51eaSHanjun Guo "Could not evaluate _PDC, using legacy perf. control.\n")); 13646ba51eaSHanjun Guo 13746ba51eaSHanjun Guo return status; 13846ba51eaSHanjun Guo } 13946ba51eaSHanjun Guo 14046ba51eaSHanjun Guo void acpi_processor_set_pdc(acpi_handle handle) 14146ba51eaSHanjun Guo { 14246ba51eaSHanjun Guo struct acpi_object_list *obj_list; 14346ba51eaSHanjun Guo 14446ba51eaSHanjun Guo if (arch_has_acpi_pdc() == false) 14546ba51eaSHanjun Guo return; 14646ba51eaSHanjun Guo 14746ba51eaSHanjun Guo obj_list = acpi_processor_alloc_pdc(); 14846ba51eaSHanjun Guo if (!obj_list) 14946ba51eaSHanjun Guo return; 15046ba51eaSHanjun Guo 15146ba51eaSHanjun Guo acpi_processor_eval_pdc(handle, obj_list); 15246ba51eaSHanjun Guo 15346ba51eaSHanjun Guo kfree(obj_list->pointer->buffer.pointer); 15446ba51eaSHanjun Guo kfree(obj_list->pointer); 15546ba51eaSHanjun Guo kfree(obj_list); 15646ba51eaSHanjun Guo } 15746ba51eaSHanjun Guo 15846ba51eaSHanjun Guo static acpi_status __init 15946ba51eaSHanjun Guo early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) 16046ba51eaSHanjun Guo { 16146ba51eaSHanjun Guo if (processor_physically_present(handle) == false) 16246ba51eaSHanjun Guo return AE_OK; 16346ba51eaSHanjun Guo 16446ba51eaSHanjun Guo acpi_processor_set_pdc(handle); 16546ba51eaSHanjun Guo return AE_OK; 16646ba51eaSHanjun Guo } 16746ba51eaSHanjun Guo 16846ba51eaSHanjun Guo static int __init set_no_mwait(const struct dmi_system_id *id) 16946ba51eaSHanjun Guo { 17046ba51eaSHanjun Guo pr_notice("%s detected - disabling mwait for CPU C-states\n", 17146ba51eaSHanjun Guo id->ident); 17246ba51eaSHanjun Guo boot_option_idle_override = IDLE_NOMWAIT; 17346ba51eaSHanjun Guo return 0; 17446ba51eaSHanjun Guo } 17546ba51eaSHanjun Guo 1766faadbbbSChristoph Hellwig static const struct dmi_system_id processor_idle_dmi_table[] __initconst = { 17746ba51eaSHanjun Guo { 17846ba51eaSHanjun Guo set_no_mwait, "Extensa 5220", { 17946ba51eaSHanjun Guo DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 18046ba51eaSHanjun Guo DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 18146ba51eaSHanjun Guo DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), 18246ba51eaSHanjun Guo DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, 18346ba51eaSHanjun Guo {}, 18446ba51eaSHanjun Guo }; 18546ba51eaSHanjun Guo 18646ba51eaSHanjun Guo static void __init processor_dmi_check(void) 18746ba51eaSHanjun Guo { 18846ba51eaSHanjun Guo /* 18946ba51eaSHanjun Guo * Check whether the system is DMI table. If yes, OSPM 19046ba51eaSHanjun Guo * should not use mwait for CPU-states. 19146ba51eaSHanjun Guo */ 19246ba51eaSHanjun Guo dmi_check_system(processor_idle_dmi_table); 19346ba51eaSHanjun Guo } 19446ba51eaSHanjun Guo 19546ba51eaSHanjun Guo void __init acpi_early_processor_set_pdc(void) 19646ba51eaSHanjun Guo { 19746ba51eaSHanjun Guo processor_dmi_check(); 19846ba51eaSHanjun Guo 19946ba51eaSHanjun Guo acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 20046ba51eaSHanjun Guo ACPI_UINT32_MAX, 20146ba51eaSHanjun Guo early_init_pdc, NULL, NULL, NULL); 20246ba51eaSHanjun Guo acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL); 20346ba51eaSHanjun Guo } 204