// 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/slab.h>#include <linux/acpi.h>#include <acpi/processor.h> #include "internal.h" static void acpi_set_pdc_bits(u32 *buf){	buf[0] = ACPI_PDC_REVISION_ID;	buf[1] = 1;	buf[2] = 0; 	/* Twiddle arch-specific bits needed for _PDC */	arch_acpi_set_proc_cap_bits(&buf[2]);} 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; 	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;} void __init acpi_early_processor_set_pdc(void){	acpi_proc_quirk_mwait_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);}