1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 246ba51eaSHanjun Guo /* 346ba51eaSHanjun Guo * Copyright (C) 2005 Intel Corporation 446ba51eaSHanjun Guo * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. 546ba51eaSHanjun Guo * 646ba51eaSHanjun Guo * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> 746ba51eaSHanjun Guo * - Added _PDC for platforms with Intel CPUs 846ba51eaSHanjun Guo */ 946ba51eaSHanjun Guo 1046ba51eaSHanjun Guo #define pr_fmt(fmt) "ACPI: " fmt 1146ba51eaSHanjun Guo 1246ba51eaSHanjun Guo #include <linux/dmi.h> 1346ba51eaSHanjun Guo #include <linux/slab.h> 1446ba51eaSHanjun Guo #include <linux/acpi.h> 1546ba51eaSHanjun Guo #include <acpi/processor.h> 1646ba51eaSHanjun Guo 17073828e9SRoger Pau Monne #include <xen/xen.h> 18073828e9SRoger Pau Monne 1946ba51eaSHanjun Guo #include "internal.h" 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 52073828e9SRoger Pau Monne if (xen_initial_domain()) 53073828e9SRoger Pau Monne /* 54073828e9SRoger Pau Monne * When running as a Xen dom0 the number of processors Linux 55073828e9SRoger Pau Monne * sees can be different from the real number of processors on 56073828e9SRoger Pau Monne * the system, and we still need to execute _PDC for all of 57073828e9SRoger Pau Monne * them. 58073828e9SRoger Pau Monne */ 59073828e9SRoger Pau Monne return xen_processor_present(acpi_id); 60073828e9SRoger Pau Monne 6146ba51eaSHanjun Guo type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; 6246ba51eaSHanjun Guo cpuid = acpi_get_cpuid(handle, type, acpi_id); 6346ba51eaSHanjun Guo 6425956b66SHanjun Guo return !invalid_logical_cpuid(cpuid); 6546ba51eaSHanjun Guo } 6646ba51eaSHanjun Guo 6746ba51eaSHanjun Guo static void acpi_set_pdc_bits(u32 *buf) 6846ba51eaSHanjun Guo { 6946ba51eaSHanjun Guo buf[0] = ACPI_PDC_REVISION_ID; 7046ba51eaSHanjun Guo buf[1] = 1; 7146ba51eaSHanjun Guo 7246ba51eaSHanjun Guo /* Enable coordination with firmware's _TSD info */ 7346ba51eaSHanjun Guo buf[2] = ACPI_PDC_SMP_T_SWCOORD; 7446ba51eaSHanjun Guo 7546ba51eaSHanjun Guo /* Twiddle arch-specific bits needed for _PDC */ 7646ba51eaSHanjun Guo arch_acpi_set_pdc_bits(buf); 7746ba51eaSHanjun Guo } 7846ba51eaSHanjun Guo 7946ba51eaSHanjun Guo static struct acpi_object_list *acpi_processor_alloc_pdc(void) 8046ba51eaSHanjun Guo { 8146ba51eaSHanjun Guo struct acpi_object_list *obj_list; 8246ba51eaSHanjun Guo union acpi_object *obj; 8346ba51eaSHanjun Guo u32 *buf; 8446ba51eaSHanjun Guo 8546ba51eaSHanjun Guo /* allocate and initialize pdc. It will be used later. */ 8646ba51eaSHanjun Guo obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); 8746ba51eaSHanjun Guo if (!obj_list) 8846ba51eaSHanjun Guo goto out; 8946ba51eaSHanjun Guo 9046ba51eaSHanjun Guo obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); 9146ba51eaSHanjun Guo if (!obj) { 9246ba51eaSHanjun Guo kfree(obj_list); 9346ba51eaSHanjun Guo goto out; 9446ba51eaSHanjun Guo } 9546ba51eaSHanjun Guo 9646ba51eaSHanjun Guo buf = kmalloc(12, GFP_KERNEL); 9746ba51eaSHanjun Guo if (!buf) { 9846ba51eaSHanjun Guo kfree(obj); 9946ba51eaSHanjun Guo kfree(obj_list); 10046ba51eaSHanjun Guo goto out; 10146ba51eaSHanjun Guo } 10246ba51eaSHanjun Guo 10346ba51eaSHanjun Guo acpi_set_pdc_bits(buf); 10446ba51eaSHanjun Guo 10546ba51eaSHanjun Guo obj->type = ACPI_TYPE_BUFFER; 10646ba51eaSHanjun Guo obj->buffer.length = 12; 10746ba51eaSHanjun Guo obj->buffer.pointer = (u8 *) buf; 10846ba51eaSHanjun Guo obj_list->count = 1; 10946ba51eaSHanjun Guo obj_list->pointer = obj; 11046ba51eaSHanjun Guo 11146ba51eaSHanjun Guo return obj_list; 11246ba51eaSHanjun Guo out: 11346ba51eaSHanjun Guo pr_err("Memory allocation error\n"); 11446ba51eaSHanjun Guo return NULL; 11546ba51eaSHanjun Guo } 11646ba51eaSHanjun Guo 11746ba51eaSHanjun Guo /* 11846ba51eaSHanjun Guo * _PDC is required for a BIOS-OS handshake for most of the newer 11946ba51eaSHanjun Guo * ACPI processor features. 12046ba51eaSHanjun Guo */ 12146ba51eaSHanjun Guo static acpi_status 12246ba51eaSHanjun Guo acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) 12346ba51eaSHanjun Guo { 12446ba51eaSHanjun Guo acpi_status status = AE_OK; 12546ba51eaSHanjun Guo 12646ba51eaSHanjun Guo if (boot_option_idle_override == IDLE_NOMWAIT) { 12746ba51eaSHanjun Guo /* 12846ba51eaSHanjun Guo * If mwait is disabled for CPU C-states, the C2C3_FFH access 12946ba51eaSHanjun Guo * mode will be disabled in the parameter of _PDC object. 13046ba51eaSHanjun Guo * Of course C1_FFH access mode will also be disabled. 13146ba51eaSHanjun Guo */ 13246ba51eaSHanjun Guo union acpi_object *obj; 13346ba51eaSHanjun Guo u32 *buffer = NULL; 13446ba51eaSHanjun Guo 13546ba51eaSHanjun Guo obj = pdc_in->pointer; 13646ba51eaSHanjun Guo buffer = (u32 *)(obj->buffer.pointer); 13746ba51eaSHanjun Guo buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); 13846ba51eaSHanjun Guo 13946ba51eaSHanjun Guo } 14046ba51eaSHanjun Guo status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); 14146ba51eaSHanjun Guo 14246ba51eaSHanjun Guo if (ACPI_FAILURE(status)) 14352af99c3SRafael J. Wysocki acpi_handle_debug(handle, 14452af99c3SRafael J. Wysocki "Could not evaluate _PDC, using legacy perf control\n"); 14546ba51eaSHanjun Guo 14646ba51eaSHanjun Guo return status; 14746ba51eaSHanjun Guo } 14846ba51eaSHanjun Guo 14946ba51eaSHanjun Guo void acpi_processor_set_pdc(acpi_handle handle) 15046ba51eaSHanjun Guo { 15146ba51eaSHanjun Guo struct acpi_object_list *obj_list; 15246ba51eaSHanjun Guo 15346ba51eaSHanjun Guo if (arch_has_acpi_pdc() == false) 15446ba51eaSHanjun Guo return; 15546ba51eaSHanjun Guo 15646ba51eaSHanjun Guo obj_list = acpi_processor_alloc_pdc(); 15746ba51eaSHanjun Guo if (!obj_list) 15846ba51eaSHanjun Guo return; 15946ba51eaSHanjun Guo 16046ba51eaSHanjun Guo acpi_processor_eval_pdc(handle, obj_list); 16146ba51eaSHanjun Guo 16246ba51eaSHanjun Guo kfree(obj_list->pointer->buffer.pointer); 16346ba51eaSHanjun Guo kfree(obj_list->pointer); 16446ba51eaSHanjun Guo kfree(obj_list); 16546ba51eaSHanjun Guo } 16646ba51eaSHanjun Guo 16746ba51eaSHanjun Guo static acpi_status __init 16846ba51eaSHanjun Guo early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) 16946ba51eaSHanjun Guo { 17046ba51eaSHanjun Guo if (processor_physically_present(handle) == false) 17146ba51eaSHanjun Guo return AE_OK; 17246ba51eaSHanjun Guo 17346ba51eaSHanjun Guo acpi_processor_set_pdc(handle); 17446ba51eaSHanjun Guo return AE_OK; 17546ba51eaSHanjun Guo } 17646ba51eaSHanjun Guo 17746ba51eaSHanjun Guo void __init acpi_early_processor_set_pdc(void) 17846ba51eaSHanjun Guo { 179*0a0e2ea6SMichal Wilczynski acpi_proc_quirk_mwait_check(); 18046ba51eaSHanjun Guo 18146ba51eaSHanjun Guo acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 18246ba51eaSHanjun Guo ACPI_UINT32_MAX, 18346ba51eaSHanjun Guo early_init_pdc, NULL, NULL, NULL); 18446ba51eaSHanjun Guo acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL); 18546ba51eaSHanjun Guo } 186