diff options
Diffstat (limited to 'include/linux/cpuidle.h')
| -rw-r--r-- | include/linux/cpuidle.h | 138 |
1 files changed, 103 insertions, 35 deletions
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 4dff74f48d4b..4073690504a7 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -14,6 +14,7 @@ #include <linux/percpu.h> #include <linux/list.h> #include <linux/hrtimer.h> +#include <linux/context_tracking.h> #define CPUIDLE_STATE_MAX 10 #define CPUIDLE_NAME_LEN 16 @@ -29,12 +30,16 @@ struct cpuidle_driver; * CPUIDLE DEVICE INTERFACE * ****************************/ +#define CPUIDLE_STATE_DISABLED_BY_USER BIT(0) +#define CPUIDLE_STATE_DISABLED_BY_DRIVER BIT(1) + struct cpuidle_state_usage { unsigned long long disable; unsigned long long usage; - unsigned long long time; /* in US */ + u64 time_ns; unsigned long long above; /* Number of times it's been too deep */ unsigned long long below; /* Number of times it's been too shallow */ + unsigned long long rejected; /* Number of times idle entry was rejected */ #ifdef CONFIG_SUSPEND unsigned long long s2idle_usage; unsigned long long s2idle_time; /* in US */ @@ -45,35 +50,41 @@ struct cpuidle_state { char name[CPUIDLE_NAME_LEN]; char desc[CPUIDLE_DESC_LEN]; + s64 exit_latency_ns; + s64 target_residency_ns; unsigned int flags; unsigned int exit_latency; /* in US */ int power_usage; /* in mW */ unsigned int target_residency; /* in US */ - bool disabled; /* disabled on all CPUs */ int (*enter) (struct cpuidle_device *dev, struct cpuidle_driver *drv, int index); - int (*enter_dead) (struct cpuidle_device *dev, int index); + void (*enter_dead) (struct cpuidle_device *dev, int index); /* * CPUs execute ->enter_s2idle with the local tick or entire timekeeping * suspended, so it must not re-enable interrupts at any point (even * temporarily) or attempt to change states of clock event devices. + * + * This callback may point to the same function as ->enter if all of + * the above requirements are met by it. */ - void (*enter_s2idle) (struct cpuidle_device *dev, - struct cpuidle_driver *drv, - int index); + int (*enter_s2idle)(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index); }; /* Idle State Flags */ -#define CPUIDLE_FLAG_NONE (0x00) -#define CPUIDLE_FLAG_POLLING (0x01) /* polling state */ -#define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */ -#define CPUIDLE_FLAG_TIMER_STOP (0x04) /* timer is stopped on this state */ - -#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000) +#define CPUIDLE_FLAG_NONE (0x00) +#define CPUIDLE_FLAG_POLLING BIT(0) /* polling state */ +#define CPUIDLE_FLAG_COUPLED BIT(1) /* state applies to multiple cpus */ +#define CPUIDLE_FLAG_TIMER_STOP BIT(2) /* timer is stopped on this state */ +#define CPUIDLE_FLAG_UNUSABLE BIT(3) /* avoid using this state */ +#define CPUIDLE_FLAG_OFF BIT(4) /* disable this state by default */ +#define CPUIDLE_FLAG_TLB_FLUSHED BIT(5) /* idle-state flushes TLBs */ +#define CPUIDLE_FLAG_RCU_IDLE BIT(6) /* idle-state takes care of RCU */ struct cpuidle_device_kobj; struct cpuidle_state_kobj; @@ -82,11 +93,14 @@ struct cpuidle_driver_kobj; struct cpuidle_device { unsigned int registered:1; unsigned int enabled:1; - unsigned int use_deepest_state:1; unsigned int poll_time_limit:1; unsigned int cpu; + ktime_t next_hrtimer; - int last_residency; + int last_state_idx; + u64 last_residency_ns; + u64 poll_limit_ns; + u64 forced_idle_latency_limit_ns; struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX]; struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX]; struct cpuidle_driver_kobj *kobj_driver; @@ -102,6 +116,35 @@ struct cpuidle_device { DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices); DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev); +static __always_inline void ct_cpuidle_enter(void) +{ + lockdep_assert_irqs_disabled(); + /* + * Idle is allowed to (temporary) enable IRQs. It + * will return with IRQs disabled. + * + * Trace IRQs enable here, then switch off RCU, and have + * arch_cpu_idle() use raw_local_irq_enable(). Note that + * ct_idle_enter() relies on lockdep IRQ state, so switch that + * last -- this is very similar to the entry code. + */ + trace_hardirqs_on_prepare(); + lockdep_hardirqs_on_prepare(); + instrumentation_end(); + ct_idle_enter(); + lockdep_hardirqs_on(_RET_IP_); +} + +static __always_inline void ct_cpuidle_exit(void) +{ + /* + * Carefully undo the above. + */ + lockdep_hardirqs_off(_RET_IP_); + ct_idle_exit(); + instrumentation_begin(); +} + /**************************** * CPUIDLE DRIVER INTERFACE * ****************************/ @@ -109,7 +152,6 @@ DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev); struct cpuidle_driver { const char *name; struct module *owner; - int refcnt; /* used by the cpuidle framework to setup the broadcast timer */ unsigned int bctimer:1; @@ -120,6 +162,9 @@ struct cpuidle_driver { /* the driver handles the cpus in cpumask */ struct cpumask *cpumask; + + /* preferred governor to switch at register time */ + const char *governor; }; #ifdef CONFIG_CPU_IDLE @@ -133,11 +178,13 @@ extern int cpuidle_select(struct cpuidle_driver *drv, extern int cpuidle_enter(struct cpuidle_driver *drv, struct cpuidle_device *dev, int index); extern void cpuidle_reflect(struct cpuidle_device *dev, int index); +extern u64 cpuidle_poll_time(struct cpuidle_driver *drv, + struct cpuidle_device *dev); extern int cpuidle_register_driver(struct cpuidle_driver *drv); extern struct cpuidle_driver *cpuidle_get_driver(void); -extern struct cpuidle_driver *cpuidle_driver_ref(void); -extern void cpuidle_driver_unref(void); +extern void cpuidle_driver_state_disabled(struct cpuidle_driver *drv, int idx, + bool disable); extern void cpuidle_unregister_driver(struct cpuidle_driver *drv); extern int cpuidle_register_device(struct cpuidle_device *dev); extern void cpuidle_unregister_device(struct cpuidle_device *dev); @@ -167,11 +214,14 @@ static inline int cpuidle_enter(struct cpuidle_driver *drv, struct cpuidle_device *dev, int index) {return -ENODEV; } static inline void cpuidle_reflect(struct cpuidle_device *dev, int index) { } +static inline u64 cpuidle_poll_time(struct cpuidle_driver *drv, + struct cpuidle_device *dev) +{return 0; } static inline int cpuidle_register_driver(struct cpuidle_driver *drv) {return -ENODEV; } static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; } -static inline struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; } -static inline void cpuidle_driver_unref(void) {} +static inline void cpuidle_driver_state_disabled(struct cpuidle_driver *drv, + int idx, bool disable) { } static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { } static inline int cpuidle_register_device(struct cpuidle_device *dev) {return -ENODEV; } @@ -195,18 +245,22 @@ static inline struct cpuidle_device *cpuidle_get_device(void) {return NULL; } #ifdef CONFIG_CPU_IDLE extern int cpuidle_find_deepest_state(struct cpuidle_driver *drv, - struct cpuidle_device *dev); + struct cpuidle_device *dev, + u64 latency_limit_ns); extern int cpuidle_enter_s2idle(struct cpuidle_driver *drv, - struct cpuidle_device *dev); -extern void cpuidle_use_deepest_state(bool enable); + struct cpuidle_device *dev, + u64 latency_limit_ns); +extern void cpuidle_use_deepest_state(u64 latency_limit_ns); #else static inline int cpuidle_find_deepest_state(struct cpuidle_driver *drv, - struct cpuidle_device *dev) + struct cpuidle_device *dev, + u64 latency_limit_ns) {return -ENODEV; } static inline int cpuidle_enter_s2idle(struct cpuidle_driver *drv, - struct cpuidle_device *dev) + struct cpuidle_device *dev, + u64 latency_limit_ns) {return -ENODEV; } -static inline void cpuidle_use_deepest_state(bool enable) +static inline void cpuidle_use_deepest_state(u64 latency_limit_ns) { } #endif @@ -249,15 +303,13 @@ struct cpuidle_governor { void (*reflect) (struct cpuidle_device *dev, int index); }; -#ifdef CONFIG_CPU_IDLE extern int cpuidle_register_governor(struct cpuidle_governor *gov); -extern int cpuidle_governor_latency_req(unsigned int cpu); -#else -static inline int cpuidle_register_governor(struct cpuidle_governor *gov) -{return 0;} -#endif +extern s64 cpuidle_governor_latency_req(unsigned int cpu); -#define __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, is_retention) \ +#define __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, \ + idx, \ + state, \ + is_retention, is_rcu) \ ({ \ int __ret = 0; \ \ @@ -269,7 +321,11 @@ static inline int cpuidle_register_governor(struct cpuidle_governor *gov) if (!is_retention) \ __ret = cpu_pm_enter(); \ if (!__ret) { \ - __ret = low_level_idle_enter(idx); \ + if (!is_rcu) \ + ct_cpuidle_enter(); \ + __ret = low_level_idle_enter(state); \ + if (!is_rcu) \ + ct_cpuidle_exit(); \ if (!is_retention) \ cpu_pm_exit(); \ } \ @@ -278,9 +334,21 @@ static inline int cpuidle_register_governor(struct cpuidle_governor *gov) }) #define CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx) \ - __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, 0) + __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, idx, 0, 0) #define CPU_PM_CPU_IDLE_ENTER_RETENTION(low_level_idle_enter, idx) \ - __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, 1) + __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, idx, 1, 0) + +#define CPU_PM_CPU_IDLE_ENTER_PARAM(low_level_idle_enter, idx, state) \ + __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, state, 0, 0) + +#define CPU_PM_CPU_IDLE_ENTER_PARAM_RCU(low_level_idle_enter, idx, state) \ + __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, state, 0, 1) + +#define CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(low_level_idle_enter, idx, state) \ + __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, state, 1, 0) + +#define CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM_RCU(low_level_idle_enter, idx, state) \ + __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, state, 1, 1) #endif /* _LINUX_CPUIDLE_H */ |