476525004a
Pull ACPI & power management update from Len Brown:
"Re-write of the turbostat tool.
lower overhead was necessary for measuring very large system when
they are very idle.
IVB support in intel_idle
It's what I run on my IVB, others should be able to also:-)
ACPICA core update
We have found some bugs due to divergence between Linux and the
upstream ACPICA base. Most of these patches are to reduce that
divergence to reduce the risk of future bugs.
Some cpuidle updates, mostly for non-Intel
More will be coming, as they depend on this part.
Some thermal management changes needed by non-ACPI systems.
Some _OST (OS Status Indication) updates for hot ACPI hot-plug."
* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux: (51 commits)
Thermal: Documentation update
Thermal: Add Hysteresis attributes
Thermal: Make Thermal trip points writeable
ACPI/AC: prevent OOPS on some boxes due to missing check power_supply_register() return value check
tools/power: turbostat: fix large c1% issue
tools/power: turbostat v2 - re-write for efficiency
ACPICA: Update to version 20120711
ACPICA: AcpiSrc: Fix some translation issues for Linux conversion
ACPICA: Update header files copyrights to 2012
ACPICA: Add new ACPI table load/unload external interfaces
ACPICA: Split file: tbxface.c -> tbxfload.c
ACPICA: Add PCC address space to space ID decode function
ACPICA: Fix some comment fields
ACPICA: Table manager: deploy new firmware error/warning interfaces
ACPICA: Add new interfaces for BIOS(firmware) errors and warnings
ACPICA: Split exception code utilities to a new file, utexcep.c
ACPI: acpi_pad: tune round_robin_time
ACPICA: Update to version 20120620
ACPICA: Add support for implicit notify on multiple devices
ACPICA: Update comments; no functional change
...
240 lines
6.7 KiB
C
240 lines
6.7 KiB
C
/*
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* cpuidle.h - a generic framework for CPU idle power management
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*
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* (C) 2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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* Shaohua Li <shaohua.li@intel.com>
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* Adam Belay <abelay@novell.com>
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*
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* This code is licenced under the GPL.
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*/
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#ifndef _LINUX_CPUIDLE_H
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#define _LINUX_CPUIDLE_H
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#include <linux/percpu.h>
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#include <linux/list.h>
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#include <linux/kobject.h>
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#include <linux/completion.h>
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#include <linux/hrtimer.h>
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#define CPUIDLE_STATE_MAX 8
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#define CPUIDLE_NAME_LEN 16
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#define CPUIDLE_DESC_LEN 32
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struct module;
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struct cpuidle_device;
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struct cpuidle_driver;
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/****************************
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* CPUIDLE DEVICE INTERFACE *
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****************************/
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struct cpuidle_state_usage {
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void *driver_data;
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unsigned long long disable;
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unsigned long long usage;
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unsigned long long time; /* in US */
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};
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struct cpuidle_state {
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char name[CPUIDLE_NAME_LEN];
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char desc[CPUIDLE_DESC_LEN];
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unsigned int flags;
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unsigned int exit_latency; /* in US */
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int power_usage; /* in mW */
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unsigned int target_residency; /* in US */
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bool disabled; /* disabled on all CPUs */
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int (*enter) (struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index);
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int (*enter_dead) (struct cpuidle_device *dev, int index);
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};
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/* Idle State Flags */
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#define CPUIDLE_FLAG_TIME_VALID (0x01) /* is residency time measurable? */
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#define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */
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#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
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/**
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* cpuidle_get_statedata - retrieves private driver state data
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* @st_usage: the state usage statistics
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*/
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static inline void *cpuidle_get_statedata(struct cpuidle_state_usage *st_usage)
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{
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return st_usage->driver_data;
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}
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/**
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* cpuidle_set_statedata - stores private driver state data
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* @st_usage: the state usage statistics
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* @data: the private data
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*/
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static inline void
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cpuidle_set_statedata(struct cpuidle_state_usage *st_usage, void *data)
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{
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st_usage->driver_data = data;
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}
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struct cpuidle_state_kobj {
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struct cpuidle_state *state;
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struct cpuidle_state_usage *state_usage;
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struct completion kobj_unregister;
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struct kobject kobj;
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};
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struct cpuidle_device {
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unsigned int registered:1;
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unsigned int enabled:1;
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unsigned int cpu;
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int last_residency;
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int state_count;
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struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX];
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struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
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struct list_head device_list;
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struct kobject kobj;
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struct completion kobj_unregister;
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#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
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int safe_state_index;
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cpumask_t coupled_cpus;
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struct cpuidle_coupled *coupled;
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#endif
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};
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DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices);
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/**
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* cpuidle_get_last_residency - retrieves the last state's residency time
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* @dev: the target CPU
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*
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* NOTE: this value is invalid if CPUIDLE_FLAG_TIME_VALID isn't set
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*/
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static inline int cpuidle_get_last_residency(struct cpuidle_device *dev)
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{
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return dev->last_residency;
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}
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/****************************
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* CPUIDLE DRIVER INTERFACE *
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****************************/
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struct cpuidle_driver {
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const char *name;
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struct module *owner;
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unsigned int power_specified:1;
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/* set to 1 to use the core cpuidle time keeping (for all states). */
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unsigned int en_core_tk_irqen:1;
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struct cpuidle_state states[CPUIDLE_STATE_MAX];
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int state_count;
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int safe_state_index;
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};
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#ifdef CONFIG_CPU_IDLE
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extern void disable_cpuidle(void);
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extern int cpuidle_idle_call(void);
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extern int cpuidle_register_driver(struct cpuidle_driver *drv);
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extern struct cpuidle_driver *cpuidle_get_driver(void);
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extern struct cpuidle_driver *cpuidle_driver_ref(void);
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extern void cpuidle_driver_unref(void);
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extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
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extern int cpuidle_register_device(struct cpuidle_device *dev);
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extern void cpuidle_unregister_device(struct cpuidle_device *dev);
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extern void cpuidle_pause_and_lock(void);
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extern void cpuidle_resume_and_unlock(void);
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extern void cpuidle_pause(void);
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extern void cpuidle_resume(void);
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extern int cpuidle_enable_device(struct cpuidle_device *dev);
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extern void cpuidle_disable_device(struct cpuidle_device *dev);
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extern int cpuidle_wrap_enter(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index,
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int (*enter)(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index));
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extern int cpuidle_play_dead(void);
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#else
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static inline void disable_cpuidle(void) { }
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static inline int cpuidle_idle_call(void) { return -ENODEV; }
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static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
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{return -ENODEV; }
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static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; }
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static inline struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; }
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static inline void cpuidle_driver_unref(void) {}
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static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { }
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static inline int cpuidle_register_device(struct cpuidle_device *dev)
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{return -ENODEV; }
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static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { }
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static inline void cpuidle_pause_and_lock(void) { }
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static inline void cpuidle_resume_and_unlock(void) { }
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static inline void cpuidle_pause(void) { }
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static inline void cpuidle_resume(void) { }
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static inline int cpuidle_enable_device(struct cpuidle_device *dev)
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{return -ENODEV; }
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static inline void cpuidle_disable_device(struct cpuidle_device *dev) { }
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static inline int cpuidle_wrap_enter(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index,
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int (*enter)(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index))
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{ return -ENODEV; }
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static inline int cpuidle_play_dead(void) {return -ENODEV; }
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#endif
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#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
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void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a);
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#endif
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/******************************
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* CPUIDLE GOVERNOR INTERFACE *
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******************************/
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struct cpuidle_governor {
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char name[CPUIDLE_NAME_LEN];
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struct list_head governor_list;
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unsigned int rating;
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int (*enable) (struct cpuidle_driver *drv,
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struct cpuidle_device *dev);
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void (*disable) (struct cpuidle_driver *drv,
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struct cpuidle_device *dev);
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int (*select) (struct cpuidle_driver *drv,
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struct cpuidle_device *dev);
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void (*reflect) (struct cpuidle_device *dev, int index);
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struct module *owner;
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};
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#ifdef CONFIG_CPU_IDLE
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extern int cpuidle_register_governor(struct cpuidle_governor *gov);
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extern void cpuidle_unregister_governor(struct cpuidle_governor *gov);
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#else
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static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
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{return 0;}
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static inline void cpuidle_unregister_governor(struct cpuidle_governor *gov) { }
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#endif
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#ifdef CONFIG_ARCH_HAS_CPU_RELAX
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#define CPUIDLE_DRIVER_STATE_START 1
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#else
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#define CPUIDLE_DRIVER_STATE_START 0
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#endif
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#endif /* _LINUX_CPUIDLE_H */
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