// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2005 Intel Corporation * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. * *      Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> *      - Added _PDC for platforms with Intel CPUs */ #define pr_fmt(fmt) "ACPI: " fmt #include <linux/dmi.h>#include <linux/slab.h>#include <linux/acpi.h>#include <acpi/processor.h> #include "internal.h" static bool __init 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); 	return !invalid_logical_cpuid(cpuid);} 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)		goto out; 	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);	if (!obj) {		kfree(obj_list);		goto out;	} 	buf = kmalloc(12, GFP_KERNEL);	if (!buf) {		kfree(obj);		kfree(obj_list);		goto out;	} 	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;out:	pr_err("Memory allocation error\n");	return NULL;} /* * _PDC is required for a BIOS-OS handshake for most of the newer * ACPI processor features. */static acpi_statusacpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in){	acpi_status status = AE_OK; 	if (boot_option_idle_override == 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_handle_debug(handle,		    "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);} static acpi_status __initearly_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;} static int __init set_no_mwait(const struct dmi_system_id *id){	pr_notice("%s detected - disabling mwait for CPU C-states\n",		  id->ident);	boot_option_idle_override = IDLE_NOMWAIT;	return 0;} static const struct dmi_system_id processor_idle_dmi_table[] __initconst = {	{	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},	{},}; static void __init processor_dmi_check(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);} void __init acpi_early_processor_set_pdc(void){	processor_dmi_check(); 	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,			    ACPI_UINT32_MAX,			    early_init_pdc, NULL, NULL, NULL);	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);}