linux/drivers/acpi/acpi_lpit.c

// SPDX-License-Identifier: GPL-2.0-only

/*
 * acpi_lpit.c - LPIT table processing functions
 *
 * Copyright (C) 2017 Intel Corporation. All rights reserved.
 */

#include <linux/cpu.h>
#include <linux/acpi.h>
#include <asm/msr.h>
#include <asm/tsc.h>
#include "internal.h"

struct lpit_residency_info { … };

/* Storage for an memory mapped and FFH based entries */
static struct lpit_residency_info residency_info_mem;
static struct lpit_residency_info residency_info_ffh;

static int lpit_read_residency_counter_us(u64 *counter, bool io_mem)
{ … }

static ssize_t low_power_idle_system_residency_us_show(struct device *dev,
						       struct device_attribute *attr,
						       char *buf)
{ … }
static DEVICE_ATTR_RO(low_power_idle_system_residency_us);

static ssize_t low_power_idle_cpu_residency_us_show(struct device *dev,
						    struct device_attribute *attr,
						    char *buf)
{ … }
static DEVICE_ATTR_RO(low_power_idle_cpu_residency_us);

int lpit_read_residency_count_address(u64 *address)
{ … }
EXPORT_SYMBOL_GPL(…);

static void lpit_update_residency(struct lpit_residency_info *info,
				 struct acpi_lpit_native *lpit_native)
{ … }

static void lpit_process(u64 begin, u64 end)
{ … }

void acpi_init_lpit(void)
{ … }