cpufreq.h

xen虚拟机源代码安装包

/*
 *  xen/include/acpi/cpufreq/cpufreq.h
 *
 *  Copyright (C) 2001 Russell King
 *            (C) 2002 - 2003 Dominik Brodowski <[e-mail]>
 *
 * $Id: cpufreq.h,v 1.36 2003/01/20 17:31:48 db Exp $
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <xen/types.h>
#include <xen/list.h>
#include <xen/cpumask.h>

#include "processor_perf.h"

#define CPUFREQ_NAME_LEN 16

struct cpufreq_cpuinfo {
    unsigned int        max_freq;
    unsigned int        min_freq;
    unsigned int        transition_latency; /* in 10^(-9) s = nanoseconds */
};

struct cpufreq_policy {
    cpumask_t           cpus;          /* affected CPUs */
    unsigned int        shared_type;   /* ANY or ALL affected CPUs
                                          should set cpufreq */
    unsigned int        cpu;           /* cpu nr of registered CPU */
    struct cpufreq_cpuinfo    cpuinfo; /* see above */

    unsigned int        min;    /* in kHz */
    unsigned int        max;    /* in kHz */
    unsigned int        cur;    /* in kHz, only needed if cpufreq
                                 * governors are used */
    unsigned int        resume; /* flag for cpufreq 1st run
                                 * S3 wakeup, hotplug cpu, etc */
};
extern struct cpufreq_policy xen_px_policy[NR_CPUS];

#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
#define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
#define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
#define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/

/******************** cpufreq transition notifiers *******************/

struct cpufreq_freqs {
    unsigned int cpu;    /* cpu nr */
    unsigned int old;
    unsigned int new;
    u8 flags;            /* flags of cpufreq_driver, see below. */
};


/*********************************************************************
 *                          CPUFREQ GOVERNORS                        *
 *********************************************************************/

#define CPUFREQ_GOV_START  1
#define CPUFREQ_GOV_STOP   2
#define CPUFREQ_GOV_LIMITS 3

/* pass a target to the cpufreq driver */
extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
                                   unsigned int target_freq,
                                   unsigned int relation);
extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy);


/*********************************************************************
 *                      CPUFREQ DRIVER INTERFACE                     *
 *********************************************************************/

#define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
#define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */

struct cpufreq_driver {
    int    (*init)(struct cpufreq_policy *policy);
    int    (*verify)(struct cpufreq_policy *policy);
    int    (*target)(struct cpufreq_policy *policy,
                     unsigned int target_freq,
                     unsigned int relation);
    unsigned int    (*get)(unsigned int cpu);
    unsigned int    (*getavg)(unsigned int cpu);
    int    (*exit)(struct cpufreq_policy *policy);
};

extern struct cpufreq_driver *cpufreq_driver;

void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state);

/*********************************************************************
 *                     FREQUENCY TABLE HELPERS                       *
 *********************************************************************/

#define CPUFREQ_ENTRY_INVALID ~0
#define CPUFREQ_TABLE_END     ~1

struct cpufreq_frequency_table {
    unsigned int    index;     /* any */
    unsigned int    frequency; /* kHz - doesn't need to be in ascending
                                * order */
};

int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
                   struct cpufreq_frequency_table *table);

int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
                   struct cpufreq_frequency_table *table,
                   unsigned int target_freq,
                   unsigned int relation,
                   unsigned int *index);


/*********************************************************************
 *                     UNIFIED DEBUG HELPERS                         *
 *********************************************************************/

struct cpu_dbs_info_s {
    uint64_t prev_cpu_idle;
    uint64_t prev_cpu_wall;
    struct cpufreq_policy *cur_policy;
    struct cpufreq_frequency_table *freq_table;
    int cpu;
    unsigned int enable:1;
};

int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event);