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alistair23-linux/include/acpi/processor.h
Rafael J. Wysocki ac212b6980 ACPI / processor: Use common hotplug infrastructure 
Split the ACPI processor driver into two parts, one that is
non-modular, resides in the ACPI core and handles the enumeration
and hotplug of processors and one that implements the rest of the
existing processor driver functionality.

The non-modular part uses an ACPI scan handler object to enumerate
processors on the basis of information provided by the ACPI namespace
and to hook up with the common ACPI hotplug infrastructure.  It also
populates the ACPI handle of each processor device having a
corresponding object in the ACPI namespace, which allows the driver
proper to bind to those devices, and makes the driver bind to them
if it is readily available (i.e. loaded) when the scan handler's
.attach() routine is running.

There are a few reasons to make this change.

First, switching the ACPI processor driver to using the common ACPI
hotplug infrastructure reduces code duplication and size considerably,
even though a new file is created along with a header comment etc.

Second, since the common hotplug code attempts to offline devices
before starting the (non-reversible) removal procedure, it will abort
(and possibly roll back) hot-remove operations involving processors
if cpu_down() returns an error code for one of them instead of
continuing them blindly (if /sys/firmware/acpi/hotplug/force_remove
is unset).  That is a more desirable behavior than what the current
code does.

Finally, the separation of the scan/hotplug part from the driver
proper makes it possible to simplify the driver's .remove() routine,
because it doesn't need to worry about the possible cleanup related
to processor removal any more (the scan/hotplug part is responsible
for that now) and can handle device removal and driver removal
symmetricaly (i.e. as appropriate).

Some user-visible changes in sysfs are made (for example, the
'sysdev' link from the ACPI device node to the processor device's
directory is gone and a 'physical_node' link is present instead
and a corresponding 'firmware_node' is present in the processor
device's directory, the processor driver is now visible under
/sys/bus/cpu/drivers/ and bound to the processor device), but
that shouldn't affect the functionality that users care about
(frequency scaling, C-states and thermal management).

Tested on my venerable Toshiba Portege R500.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
2013-05-12 14:14:32 +02:00

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#ifndef __ACPI_PROCESSOR_H
#define __ACPI_PROCESSOR_H
#include <linux/kernel.h>
#include <linux/cpu.h>
#include <linux/thermal.h>
#include <asm/acpi.h>
#define ACPI_PROCESSOR_CLASS "processor"
#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
#define ACPI_PROCESSOR_DEVICE_HID "ACPI0007"
#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
#define ACPI_PSD_REV0_REVISION 0 /* Support for _PSD as in ACPI 3.0 */
#define ACPI_PSD_REV0_ENTRIES 5
#define ACPI_TSD_REV0_REVISION 0 /* Support for _PSD as in ACPI 3.0 */
#define ACPI_TSD_REV0_ENTRIES 5
/*
* Types of coordination defined in ACPI 3.0. Same macros can be used across
* P, C and T states
*/
#define DOMAIN_COORD_TYPE_SW_ALL 0xfc
#define DOMAIN_COORD_TYPE_SW_ANY 0xfd
#define DOMAIN_COORD_TYPE_HW_ALL 0xfe
#define ACPI_CSTATE_SYSTEMIO 0
#define ACPI_CSTATE_FFH 1
#define ACPI_CSTATE_HALT 2
#define ACPI_CX_DESC_LEN 32
/* Power Management */
struct acpi_processor_cx;
struct acpi_power_register {
u8 descriptor;
u16 length;
u8 space_id;
u8 bit_width;
u8 bit_offset;
u8 access_size;
u64 address;
} __attribute__ ((packed));
struct acpi_processor_cx {
u8 valid;
u8 type;
u32 address;
u8 entry_method;
u8 index;
u32 latency;
u8 bm_sts_skip;
char desc[ACPI_CX_DESC_LEN];
};
struct acpi_processor_power {
struct acpi_processor_cx *state;
unsigned long bm_check_timestamp;
u32 default_state;
int count;
struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
int timer_broadcast_on_state;
};
/* Performance Management */
struct acpi_psd_package {
u64 num_entries;
u64 revision;
u64 domain;
u64 coord_type;
u64 num_processors;
} __attribute__ ((packed));
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 {
u64 core_frequency; /* megahertz */
u64 power; /* milliWatts */
u64 transition_latency; /* microseconds */
u64 bus_master_latency; /* microseconds */
u64 control; /* control value */
u64 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;
struct acpi_psd_package domain_info;
cpumask_var_t shared_cpu_map;
unsigned int shared_type;
};
/* Throttling Control */
struct acpi_tsd_package {
u64 num_entries;
u64 revision;
u64 domain;
u64 coord_type;
u64 num_processors;
} __attribute__ ((packed));
struct acpi_ptc_register {
u8 descriptor;
u16 length;
u8 space_id;
u8 bit_width;
u8 bit_offset;
u8 reserved;
u64 address;
} __attribute__ ((packed));
struct acpi_processor_tx_tss {
u64 freqpercentage; /* */
u64 power; /* milliWatts */
u64 transition_latency; /* microseconds */
u64 control; /* control value */
u64 status; /* success indicator */
};
struct acpi_processor_tx {
u16 power;
u16 performance;
};
struct acpi_processor;
struct acpi_processor_throttling {
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_tx_tss *states_tss;
struct acpi_tsd_package domain_info;
cpumask_var_t shared_cpu_map;
int (*acpi_processor_get_throttling) (struct acpi_processor * pr);
int (*acpi_processor_set_throttling) (struct acpi_processor * pr,
int state, bool force);
u32 address;
u8 duty_offset;
u8 duty_width;
u8 tsd_valid_flag;
unsigned int shared_type;
struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
};
/* Limit Interface */
struct acpi_processor_lx {
int px; /* performance 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;
u8 bm_rld_set:1;
u8 need_hotplug_init:1;
};
struct acpi_processor {
acpi_handle handle;
u32 acpi_id;
u32 id;
u32 pblk;
int performance_platform_limit;
int throttling_platform_limit;
/* 0 - states 0..n-th state available */
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 thermal_cooling_device *cdev;
struct device *dev; /* Processor device. */
};
struct acpi_processor_errata {
u8 smp;
struct {
u8 throttle:1;
u8 fdma:1;
u8 reserved:6;
u32 bmisx;
} piix4;
};
extern void acpi_processor_load_module(struct acpi_processor *pr);
extern int acpi_processor_preregister_performance(struct
acpi_processor_performance
__percpu *performance);
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);
/* parsing the _P* objects. */
extern int acpi_processor_get_performance_info(struct acpi_processor *pr);
/* for communication between multiple parts of the processor kernel module */
DECLARE_PER_CPU(struct acpi_processor *, processors);
extern struct acpi_processor_errata errata;
#ifdef ARCH_HAS_POWER_INIT
void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
unsigned int cpu);
int acpi_processor_ffh_cstate_probe(unsigned int cpu,
struct acpi_processor_cx *cx,
struct acpi_power_register *reg);
void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cstate);
#else
static inline void acpi_processor_power_init_bm_check(struct
acpi_processor_flags
*flags, unsigned int cpu)
{
flags->bm_check = 1;
return;
}
static inline int acpi_processor_ffh_cstate_probe(unsigned int cpu,
struct acpi_processor_cx *cx,
struct acpi_power_register
*reg)
{
return -1;
}
static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx
*cstate)
{
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, int event_flag);
extern int acpi_processor_get_bios_limit(int cpu, unsigned int *limit);
#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,
int event_flag)
{
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;
}
static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
{
return -ENODEV;
}
#endif /* CONFIG_CPU_FREQ */
/* in processor_core.c */
void acpi_processor_set_pdc(acpi_handle handle);
int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
/* in processor_throttling.c */
int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
int acpi_processor_get_throttling_info(struct acpi_processor *pr);
extern int acpi_processor_set_throttling(struct acpi_processor *pr,
int state, bool force);
/*
* Reevaluate whether the T-state is invalid after one cpu is
* onlined/offlined. In such case the flags.throttling will be updated.
*/
extern void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
unsigned long action);
extern const struct file_operations acpi_processor_throttling_fops;
extern void acpi_processor_throttling_init(void);
/* in processor_idle.c */
int acpi_processor_power_init(struct acpi_processor *pr);
int acpi_processor_power_exit(struct acpi_processor *pr);
int acpi_processor_cst_has_changed(struct acpi_processor *pr);
int acpi_processor_hotplug(struct acpi_processor *pr);
extern struct cpuidle_driver acpi_idle_driver;
#ifdef CONFIG_PM_SLEEP
void acpi_processor_syscore_init(void);
void acpi_processor_syscore_exit(void);
#else
static inline void acpi_processor_syscore_init(void) {}
static inline void acpi_processor_syscore_exit(void) {}
#endif
/* in processor_thermal.c */
int acpi_processor_get_limit_info(struct acpi_processor *pr);
extern const struct thermal_cooling_device_ops processor_cooling_ops;
#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
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