kern_cpu.c File Reference

#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/sx.h>
#include <sys/timetc.h>
#include <sys/taskqueue.h>
#include "cpufreq_if.h"

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Data Structures
struct	cf_saved_freq
struct	cpufreq_softc
struct	cf_setting_array

Macros
#define	CF_MAX_LEVELS   256
#define	CF_MTX_INIT(x)   sx_init((x), "cpufreq lock")
#define	CF_MTX_LOCK(x)   sx_xlock((x))
#define	CF_MTX_UNLOCK(x)   sx_xunlock((x))
#define	CF_MTX_ASSERT(x)   sx_assert((x), SX_XLOCKED)
#define	CF_DEBUG(msg...)

Functions
	__FBSDID ("$FreeBSD$")
	TAILQ_HEAD (cf_setting_lst, cf_setting_array)
static int	cpufreq_attach (device_t dev)
static void	cpufreq_startup_task (void *ctx, int pending)
static int	cpufreq_detach (device_t dev)
static int	cf_set_method (device_t dev, const struct cf_level *level, int priority)
static int	cf_get_method (device_t dev, struct cf_level *level)
static int	cf_levels_method (device_t dev, struct cf_level *levels, int *count)
static int	cpufreq_insert_abs (struct cpufreq_softc *sc, struct cf_setting *sets, int count)
static int	cpufreq_expand_set (struct cpufreq_softc *sc, struct cf_setting_array *set_arr)
static struct cf_level *	cpufreq_dup_set (struct cpufreq_softc *sc, struct cf_level *dup, struct cf_setting *set)
static int	cpufreq_curr_sysctl (SYSCTL_HANDLER_ARGS)
static int	cpufreq_levels_sysctl (SYSCTL_HANDLER_ARGS)
static int	cpufreq_settings_sysctl (SYSCTL_HANDLER_ARGS)
	DRIVER_MODULE (cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0)
static	SYSCTL_NODE (_debug, OID_AUTO, cpufreq, CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, "cpufreq debugging")
	SYSCTL_INT (_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RWTUN, &cf_lowest_freq, 1, "Don't provide levels below this frequency.")
	SYSCTL_INT (_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RWTUN, &cf_verbose, 1, "Print verbose debugging messages")
static int	cpufreq_get_frequency (device_t dev)
static int	cpufreq_get_level (device_t dev, struct cf_level *levels, int count)
static int	cpufreq_add_levels (device_t cf_dev, struct cf_setting_lst *rel_sets)
static void	cpufreq_add_freq_driver_sysctl (device_t cf_dev)
int	cpufreq_register (device_t dev)
int	cpufreq_unregister (device_t dev)
int	cpufreq_settings_changed (device_t dev)

Variables
static device_method_t	cpufreq_methods []
static driver_t	cpufreq_driver
static devclass_t	cpufreq_dc
static int	cf_lowest_freq
static int	cf_verbose

Macro Definition Documentation

CF_DEBUG

#define CF_DEBUG

(

msg...

)

Value:

        do {            \
        if (cf_verbose)                         \
                printf("cpufreq: " msg);        \
        } while (0)

Definition at line 98 of file kern_cpu.c.

CF_MAX_LEVELS

#define CF_MAX_LEVELS   256

Definition at line 62 of file kern_cpu.c.

CF_MTX_ASSERT

#define CF_MTX_ASSERT

(

x

)

sx_assert((x), SX_XLOCKED)

Definition at line 96 of file kern_cpu.c.

CF_MTX_INIT

#define CF_MTX_INIT

(

x

)

sx_init((x), "cpufreq lock")

Definition at line 93 of file kern_cpu.c.

CF_MTX_LOCK

#define CF_MTX_LOCK

(

x

)

sx_xlock((x))

Definition at line 94 of file kern_cpu.c.

CF_MTX_UNLOCK

#define CF_MTX_UNLOCK

(

x

)

sx_xunlock((x))

Definition at line 95 of file kern_cpu.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

cf_get_method()

static int cf_get_method ( device_t  dev, struct cf_level *  level  )

static

Definition at line 455 of file kern_cpu.c.

References CF_DEBUG, CF_MAX_LEVELS, CF_MTX_LOCK, CF_MTX_UNLOCK, count, cpufreq_get_level(), cpufreq_softc::curr_level, device_get_nameunit(), device_get_softc(), free(), level, levels, cpufreq_softc::lock, malloc(), printf(), set, and type.

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cf_levels_method()

static int cf_levels_method ( device_t  dev, struct cf_level *  levels, int *  count  )

static

Definition at line 633 of file kern_cpu.c.

References CF_DEBUG, cf_lowest_freq, CF_MTX_LOCK, CF_MTX_UNLOCK, count, cpufreq_add_levels(), cpufreq_expand_set(), cpufreq_insert_abs(), device_get_softc(), free(), levels, cpufreq_softc::lock, and set.

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cf_set_method()

static int cf_set_method ( device_t  dev, const struct cf_level *  level, int  priority  )

static

Definition at line 233 of file kern_cpu.c.

References CF_DEBUG, cf_lowest_freq, CF_MTX_LOCK, CF_MTX_UNLOCK, cpufreq_softc::curr_level, cpufreq_softc::curr_priority, device_get_nameunit(), device_get_softc(), device_is_attached(), device_printf(), free(), level, cf_saved_freq::level, cpufreq_softc::lock, malloc(), mp_ncpus, priority, cf_saved_freq::priority, sched_bind(), sched_prio(), sched_unbind(), set, and smp_started.

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cpufreq_add_freq_driver_sysctl()

static void cpufreq_add_freq_driver_sysctl ( device_t  cf_dev )

static

Definition at line 1068 of file kern_cpu.c.

References device_get_nameunit(), device_get_softc(), and device_get_sysctl_tree().

Referenced by cpufreq_register().

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cpufreq_add_levels()

static int cpufreq_add_levels ( device_t  cf_dev, struct cf_setting_lst *  rel_sets  )

static

Definition at line 570 of file kern_cpu.c.

References CF_DEBUG, cf_setting_array::count, cpufreq_insert_abs(), device_get_nameunit(), device_get_softc(), device_is_attached(), free(), malloc(), sets, cf_setting_array::sets, and type.

Referenced by cf_levels_method().

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cpufreq_attach()

static int cpufreq_attach ( device_t  dev )

static

Definition at line 152 of file kern_cpu.c.

References CF_DEBUG, CF_MAX_LEVELS, CF_MTX_INIT, cpufreq_curr_sysctl(), cpufreq_levels_sysctl(), cpufreq_startup_task(), cpufreq_softc::curr_level, device_get_nameunit(), device_get_parent(), device_get_softc(), device_get_sysctl_tree(), cpufreq_softc::lock, malloc(), parent, sysctl_ctx_init(), and taskqueue_enqueue().

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cpufreq_curr_sysctl()

static int cpufreq_curr_sysctl ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 936 of file kern_cpu.c.

References CF_MAX_LEVELS, count, cpufreq_dc, devclass_get_devices(), free(), levels, printf(), and sysctl_handle_int().

Referenced by cpufreq_attach().

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cpufreq_detach()

static int cpufreq_detach ( device_t  dev )

static

Definition at line 213 of file kern_cpu.c.

References CF_DEBUG, device_get_nameunit(), device_get_softc(), free(), and sysctl_ctx_free().

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cpufreq_dup_set()

static struct cf_level * cpufreq_dup_set ( struct cpufreq_softc *  sc, struct cf_level *  dup, struct cf_setting *  set  )

static

Definition at line 841 of file kern_cpu.c.

References CF_DEBUG, CF_MTX_ASSERT, device_get_nameunit(), free(), cpufreq_softc::lock, malloc(), and set.

Referenced by cpufreq_expand_set().

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cpufreq_expand_set()

static int cpufreq_expand_set ( struct cpufreq_softc *  sc, struct cf_setting_array *  set_arr  )

static

Definition at line 785 of file kern_cpu.c.

References CF_DEBUG, CF_MTX_ASSERT, cf_setting_array::count, cpufreq_dup_set(), cpufreq_softc::lock, set, and cf_setting_array::sets.

Referenced by cf_levels_method().

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cpufreq_get_frequency()

static int cpufreq_get_frequency ( device_t  dev )

static

Definition at line 423 of file kern_cpu.c.

References set.

Referenced by cpufreq_get_level().

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cpufreq_get_level()

static int cpufreq_get_level ( device_t  dev, struct cf_level *  levels, int  count  )

static

Definition at line 435 of file kern_cpu.c.

References count, cpufreq_get_frequency(), and levels.

Referenced by cf_get_method().

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cpufreq_insert_abs()

static int cpufreq_insert_abs ( struct cpufreq_softc *  sc, struct cf_setting *  sets, int  count  )

static

Definition at line 731 of file kern_cpu.c.

References CF_DEBUG, CF_MTX_ASSERT, count, level, cpufreq_softc::lock, malloc(), and sets.

Referenced by cf_levels_method(), and cpufreq_add_levels().

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cpufreq_levels_sysctl()

static int cpufreq_levels_sysctl ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 991 of file kern_cpu.c.

References CF_MAX_LEVELS, count, levels, printf(), sbuf_cpy(), sbuf_data(), sbuf_delete(), sbuf_finish(), sbuf_len(), sbuf_new(), sbuf_printf(), sbuf_trim(), set, and sysctl_handle_string().

Referenced by cpufreq_attach().

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cpufreq_register()

int cpufreq_register

(

device_t

dev

)

Definition at line 1080 of file kern_cpu.c.

References cpufreq_add_freq_driver_sysctl(), cpufreq_settings_sysctl(), device_find_child(), device_get_parent(), device_get_softc(), device_get_sysctl_ctx(), device_get_sysctl_tree(), device_get_unit(), device_probe_and_attach(), and device_quiet().

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cpufreq_settings_changed()

int cpufreq_settings_changed

(

device_t

dev

)

Definition at line 1146 of file kern_cpu.c.

References device_get_parent(), and device_get_unit().

Referenced by cpufreq_startup_task().

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cpufreq_settings_sysctl()

static int cpufreq_settings_sysctl ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 1032 of file kern_cpu.c.

References free(), malloc(), sbuf_cpy(), sbuf_data(), sbuf_delete(), sbuf_finish(), sbuf_len(), sbuf_new(), sbuf_printf(), sbuf_trim(), sets, and sysctl_handle_string().

Referenced by cpufreq_register().

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cpufreq_startup_task()

static void cpufreq_startup_task ( void *  ctx, int  pending  )

static

Definition at line 206 of file kern_cpu.c.

References cpufreq_settings_changed().

Referenced by cpufreq_attach().

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cpufreq_unregister()

int cpufreq_unregister

(

device_t

dev

)

Definition at line 1122 of file kern_cpu.c.

References device_delete_child(), device_find_child(), device_get_parent(), device_get_softc(), and device_printf().

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DRIVER_MODULE()

DRIVER_MODULE	(	cpufreq	,
		cpu	,
		cpufreq_driver	,
		cpufreq_dc	,
		0	,
		0
	)

SYSCTL_INT() [1/2]

SYSCTL_INT	(	_debug_cpufreq	,
		OID_AUTO	,
		lowest	,
		CTLFLAG_RWTUN	,
		&	cf_lowest_freq,
		1	,
		"Don't provide levels below this frequency."
	)

SYSCTL_INT() [2/2]

SYSCTL_INT	(	_debug_cpufreq	,
		OID_AUTO	,
		verbose	,
		CTLFLAG_RWTUN	,
		&	cf_verbose,
		1	,
		"Print verbose debugging messages"
	)

SYSCTL_NODE()

static SYSCTL_NODE ( _debug  , OID_AUTO  , cpufreq  , CTLFLAG_RD|  CTLFLAG_MPSAFE, NULL  , "cpufreq debugging"    )

static

TAILQ_HEAD()

TAILQ_HEAD	(	cf_setting_lst	,
		cf_setting_array
	)

Variable Documentation

cf_lowest_freq

int cf_lowest_freq

static

Definition at line 137 of file kern_cpu.c.

Referenced by cf_levels_method(), and cf_set_method().

cf_verbose

int cf_verbose

static

Definition at line 138 of file kern_cpu.c.

cpufreq_dc

devclass_t cpufreq_dc

static

Definition at line 134 of file kern_cpu.c.

Referenced by cpufreq_curr_sysctl().

cpufreq_driver

driver_t cpufreq_driver

static

Initial value:

= {
        "cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc)
}

Definition at line 131 of file kern_cpu.c.

cpufreq_methods

device_method_t cpufreq_methods[]

static

Initial value:

= {
        DEVMETHOD(device_probe,         bus_generic_probe),
        DEVMETHOD(device_attach,        cpufreq_attach),
        DEVMETHOD(device_detach,        cpufreq_detach),
 
        DEVMETHOD(cpufreq_set,          cf_set_method),
        DEVMETHOD(cpufreq_get,          cf_get_method),
        DEVMETHOD(cpufreq_levels,       cf_levels_method),
        {0, 0}
}

Definition at line 121 of file kern_cpu.c.