linux/drivers/cpuidle/governors/ladder.c

/*
 * ladder.c - the residency ladder algorithm
 *
 *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
 *  Copyright (C) 2004, 2005 Dominik Brodowski <[email protected]>
 *
 * (C) 2006-2007 Venkatesh Pallipadi <[email protected]>
 *               Shaohua Li <[email protected]>
 *               Adam Belay <[email protected]>
 *
 * This code is licenced under the GPL.
 */

#include <linux/kernel.h>
#include <linux/cpuidle.h>
#include <linux/jiffies.h>
#include <linux/tick.h>

#include <asm/io.h>
#include <linux/uaccess.h>

#define PROMOTION_COUNT …
#define DEMOTION_COUNT …

struct ladder_device_state { … };

struct ladder_device { … };

static DEFINE_PER_CPU(struct ladder_device, ladder_devices);

/**
 * ladder_do_selection - prepares private data for a state change
 * @dev: the CPU
 * @ldev: the ladder device
 * @old_idx: the current state index
 * @new_idx: the new target state index
 */
static inline void ladder_do_selection(struct cpuidle_device *dev,
				       struct ladder_device *ldev,
				       int old_idx, int new_idx)
{ … }

/**
 * ladder_select_state - selects the next state to enter
 * @drv: cpuidle driver
 * @dev: the CPU
 * @dummy: not used
 */
static int ladder_select_state(struct cpuidle_driver *drv,
			       struct cpuidle_device *dev, bool *dummy)
{ … }

/**
 * ladder_enable_device - setup for the governor
 * @drv: cpuidle driver
 * @dev: the CPU
 */
static int ladder_enable_device(struct cpuidle_driver *drv,
				struct cpuidle_device *dev)
{ … }

/**
 * ladder_reflect - update the correct last_state_idx
 * @dev: the CPU
 * @index: the index of actual state entered
 */
static void ladder_reflect(struct cpuidle_device *dev, int index)
{ … }

static struct cpuidle_governor ladder_governor = …;

/**
 * init_ladder - initializes the governor
 */
static int __init init_ladder(void)
{ … }

postcore_initcall(init_ladder);