linux/include/acpi/processor.h

#ifndef __ACPI_PROCESSOR_H
#define __ACPI_PROCESSOR_H

#include <linux/kernel.h>
#include <linux/config.h>

#include <asm/acpi.h>

#define ACPI_PROCESSOR_BUSY_METRIC	10

#define ACPI_PROCESSOR_MAX_POWER	8
#define ACPI_PROCESSOR_MAX_C2_LATENCY	100
#define ACPI_PROCESSOR_MAX_C3_LATENCY	1000

#define ACPI_PROCESSOR_MAX_THROTTLING	16
#define ACPI_PROCESSOR_MAX_THROTTLE	250	/* 25% */
#define ACPI_PROCESSOR_MAX_DUTY_WIDTH	4

#define ACPI_PDC_REVISION_ID		0x1

/* Power Management */

struct acpi_processor_cx;

struct acpi_power_register {
	u8			descriptor;
	u16			length;
	u8			space_id;
	u8			bit_width;
	u8			bit_offset;
	u8			reserved;
	u64			address;
} __attribute__ ((packed));


struct acpi_processor_cx_policy {
	u32			count;
	struct acpi_processor_cx *state;
	struct {
		u32			time;
		u32			ticks;
		u32			count;
		u32			bm;
	}			threshold;
};

struct acpi_processor_cx {
	u8			valid;
	u8			type;
	u32			address;
	u32			latency;
	u32			latency_ticks;
	u32			power;
	u32			usage;
	struct acpi_processor_cx_policy promotion;
	struct acpi_processor_cx_policy demotion;
};

struct acpi_processor_power {
	struct acpi_processor_cx *state;
	unsigned long		bm_check_timestamp;
	u32			default_state;
	u32			bm_activity;
	int			count;
	struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];

	/* the _PDC objects passed by the driver, if any */
	struct acpi_object_list *pdc;
};

/* Performance Management */

struct acpi_pct_register {
	u8			descriptor;
	u16			length;
	u8			space_id;
	u8			bit_width;
	u8			bit_offset;
	u8			reserved;
	u64			address;
} __attribute__ ((packed));

struct acpi_processor_px {
	acpi_integer		core_frequency;		/* megahertz */
	acpi_integer		power;			/* milliWatts */
	acpi_integer		transition_latency;	/* microseconds */
	acpi_integer		bus_master_latency;	/* microseconds */
	acpi_integer		control;		/* control value */
	acpi_integer		status;			/* success indicator */
};

struct acpi_processor_performance {
	unsigned int		 state;
	unsigned int		 platform_limit;
	struct acpi_pct_register control_register;
	struct acpi_pct_register status_register;
	unsigned int		 state_count;
	struct acpi_processor_px *states;

	/* the _PDC objects passed by the driver, if any */
	struct acpi_object_list *pdc;
};



/* Throttling Control */

struct acpi_processor_tx {
	u16			power;
	u16			performance;
};

struct acpi_processor_throttling {
	int			state;
	u32			address;
	u8			duty_offset;
	u8			duty_width;
	int			state_count;
	struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
};

/* Limit Interface */

struct acpi_processor_lx {
	int			px;		/* performace state */	
	int			tx;		/* throttle level */
};

struct acpi_processor_limit {
	struct acpi_processor_lx state;		/* current limit */
	struct acpi_processor_lx thermal;	/* thermal limit */
	struct acpi_processor_lx user;		/* user limit */
};


struct acpi_processor_flags {
	u8			power:1;
	u8			performance:1;
	u8			throttling:1;
	u8			limit:1;
	u8			bm_control:1;
	u8			bm_check:1;
	u8			has_cst:1;
	u8			power_setup_done:1;
};

struct acpi_processor {
	acpi_handle		handle;
	u32			acpi_id;
	u32			id;
	u32			pblk;
	int			performance_platform_limit;
	struct acpi_processor_flags flags;
	struct acpi_processor_power power;
	struct acpi_processor_performance *performance;
	struct acpi_processor_throttling throttling;
	struct acpi_processor_limit limit;
};

struct acpi_processor_errata {
	u8			smp;
	struct {
		u8			throttle:1;
		u8			fdma:1;
		u8			reserved:6;
		u32			bmisx;
	}			piix4;
};

extern int acpi_processor_register_performance (
	struct acpi_processor_performance * performance,
	unsigned int cpu);
extern void acpi_processor_unregister_performance (
	struct acpi_processor_performance * performance,
	unsigned int cpu);

/* note: this locks both the calling module and the processor module
         if a _PPC object exists, rmmod is disallowed then */
int acpi_processor_notify_smm(struct module *calling_module);



/* for communication between multiple parts of the processor kernel module */
extern struct acpi_processor	*processors[NR_CPUS];
extern struct acpi_processor_errata errata;

int acpi_processor_set_pdc(struct acpi_processor *pr,
		struct acpi_object_list *pdc_in);

#ifdef ARCH_HAS_POWER_PDC_INIT
void acpi_processor_power_init_pdc(struct acpi_processor_power *pow,
		unsigned int cpu);
void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
		unsigned int cpu);
#else
static inline void acpi_processor_power_init_pdc(
		struct acpi_processor_power *pow, unsigned int cpu)
{
	pow->pdc = NULL;
	return;
}

static inline void acpi_processor_power_init_bm_check(
		struct acpi_processor_flags *flags, unsigned int cpu)
{
	flags->bm_check = 1;
	return;
}
#endif

/* in processor_perflib.c */

#ifdef CONFIG_CPU_FREQ
void acpi_processor_ppc_init(void);
void acpi_processor_ppc_exit(void);
int acpi_processor_ppc_has_changed(struct acpi_processor *pr);
#else
static inline void acpi_processor_ppc_init(void) { return; }
static inline void acpi_processor_ppc_exit(void) { return; }
static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr) {
	static unsigned int printout = 1;
	if (printout) {
		printk(KERN_WARNING "Warning: Processor Platform Limit event detected, but not handled.\n");
		printk(KERN_WARNING "Consider compiling CPUfreq support into your kernel.\n");
		printout = 0;
	}
	return 0;
}
#endif /* CONFIG_CPU_FREQ */

/* in processor_throttling.c */
int acpi_processor_get_throttling_info (struct acpi_processor *pr);
int acpi_processor_set_throttling (struct acpi_processor *pr, int state);
ssize_t acpi_processor_write_throttling (
        struct file		*file,
        const char		__user *buffer,
        size_t			count,
        loff_t			*data);
extern struct file_operations acpi_processor_throttling_fops;

/* in processor_idle.c */
int acpi_processor_power_init(struct acpi_processor *pr, struct acpi_device *device);
int acpi_processor_cst_has_changed (struct acpi_processor *pr);
int acpi_processor_power_exit(struct acpi_processor *pr, struct acpi_device *device);


/* in processor_thermal.c */
int acpi_processor_get_limit_info (struct acpi_processor *pr);
ssize_t acpi_processor_write_limit (
	struct file		*file,
	const char		__user *buffer,
	size_t			count,
	loff_t			*data);
extern struct file_operations acpi_processor_limit_fops;

#ifdef CONFIG_CPU_FREQ
void acpi_thermal_cpufreq_init(void);
void acpi_thermal_cpufreq_exit(void);
#else
static inline void acpi_thermal_cpufreq_init(void) { return; }
static inline void acpi_thermal_cpufreq_exit(void) { return; }
#endif


#endif