Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 1 | /* linux/include/linux/tick.h |
| 2 | * |
| 3 | * This file contains the structure definitions for tick related functions |
| 4 | * |
| 5 | */ |
| 6 | #ifndef _LINUX_TICK_H |
| 7 | #define _LINUX_TICK_H |
| 8 | |
| 9 | #include <linux/clockchips.h> |
Frederic Weisbecker | 2bbb681 | 2011-10-08 16:01:00 +0200 | [diff] [blame^] | 10 | #include <linux/irqflags.h> |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 11 | |
| 12 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
| 13 | |
| 14 | enum tick_device_mode { |
| 15 | TICKDEV_MODE_PERIODIC, |
| 16 | TICKDEV_MODE_ONESHOT, |
| 17 | }; |
| 18 | |
| 19 | struct tick_device { |
| 20 | struct clock_event_device *evtdev; |
| 21 | enum tick_device_mode mode; |
| 22 | }; |
| 23 | |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 24 | enum tick_nohz_mode { |
| 25 | NOHZ_MODE_INACTIVE, |
| 26 | NOHZ_MODE_LOWRES, |
| 27 | NOHZ_MODE_HIGHRES, |
| 28 | }; |
| 29 | |
| 30 | /** |
| 31 | * struct tick_sched - sched tick emulation and no idle tick control/stats |
| 32 | * @sched_timer: hrtimer to schedule the periodic tick in high |
| 33 | * resolution mode |
| 34 | * @idle_tick: Store the last idle tick expiry time when the tick |
| 35 | * timer is modified for idle sleeps. This is necessary |
| 36 | * to resume the tick timer operation in the timeline |
| 37 | * when the CPU returns from idle |
| 38 | * @tick_stopped: Indicator that the idle tick has been stopped |
| 39 | * @idle_jiffies: jiffies at the entry to idle for idle time accounting |
| 40 | * @idle_calls: Total number of idle calls |
| 41 | * @idle_sleeps: Number of idle calls, where the sched tick was stopped |
| 42 | * @idle_entrytime: Time when the idle call was entered |
Thomas Gleixner | 5df7fa1 | 2008-02-01 17:45:14 +0100 | [diff] [blame] | 43 | * @idle_waketime: Time when the idle was interrupted |
| 44 | * @idle_exittime: Time when the idle state was left |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 45 | * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped |
Arjan van de Ven | 0224cf4 | 2010-05-09 08:25:23 -0700 | [diff] [blame] | 46 | * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 47 | * @sleep_length: Duration of the current idle sleep |
Thomas Gleixner | 2718501 | 2009-11-12 22:12:06 +0100 | [diff] [blame] | 48 | * @do_timer_lst: CPU was the last one doing do_timer before going idle |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 49 | */ |
| 50 | struct tick_sched { |
| 51 | struct hrtimer sched_timer; |
| 52 | unsigned long check_clocks; |
| 53 | enum tick_nohz_mode nohz_mode; |
| 54 | ktime_t idle_tick; |
Thomas Gleixner | b8f8c3c | 2008-07-18 17:27:28 +0200 | [diff] [blame] | 55 | int inidle; |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 56 | int tick_stopped; |
| 57 | unsigned long idle_jiffies; |
| 58 | unsigned long idle_calls; |
| 59 | unsigned long idle_sleeps; |
Venki Pallipadi | 6378ddb | 2008-01-30 13:30:04 +0100 | [diff] [blame] | 60 | int idle_active; |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 61 | ktime_t idle_entrytime; |
Thomas Gleixner | 5df7fa1 | 2008-02-01 17:45:14 +0100 | [diff] [blame] | 62 | ktime_t idle_waketime; |
| 63 | ktime_t idle_exittime; |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 64 | ktime_t idle_sleeptime; |
Arjan van de Ven | 0224cf4 | 2010-05-09 08:25:23 -0700 | [diff] [blame] | 65 | ktime_t iowait_sleeptime; |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 66 | ktime_t sleep_length; |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 67 | unsigned long last_jiffies; |
| 68 | unsigned long next_jiffies; |
| 69 | ktime_t idle_expires; |
Thomas Gleixner | 2718501 | 2009-11-12 22:12:06 +0100 | [diff] [blame] | 70 | int do_timer_last; |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 71 | }; |
| 72 | |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 73 | extern void __init tick_init(void); |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 74 | extern int tick_is_oneshot_available(void); |
Ingo Molnar | 289f480 | 2007-02-16 01:28:15 -0800 | [diff] [blame] | 75 | extern struct tick_device *tick_get_device(int cpu); |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 76 | |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 77 | # ifdef CONFIG_HIGH_RES_TIMERS |
| 78 | extern int tick_init_highres(void); |
| 79 | extern int tick_program_event(ktime_t expires, int force); |
| 80 | extern void tick_setup_sched_timer(void); |
Miao Xie | 3c4fbe5 | 2008-08-20 16:37:38 -0700 | [diff] [blame] | 81 | # endif |
| 82 | |
| 83 | # if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 84 | extern void tick_cancel_sched_timer(int cpu); |
| 85 | # else |
| 86 | static inline void tick_cancel_sched_timer(int cpu) { } |
Miao Xie | 3c4fbe5 | 2008-08-20 16:37:38 -0700 | [diff] [blame] | 87 | # endif |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 88 | |
Ingo Molnar | 289f480 | 2007-02-16 01:28:15 -0800 | [diff] [blame] | 89 | # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
| 90 | extern struct tick_device *tick_get_broadcast_device(void); |
Rusty Russell | 6b95482 | 2009-01-01 10:12:25 +1030 | [diff] [blame] | 91 | extern struct cpumask *tick_get_broadcast_mask(void); |
Ingo Molnar | 289f480 | 2007-02-16 01:28:15 -0800 | [diff] [blame] | 92 | |
| 93 | # ifdef CONFIG_TICK_ONESHOT |
Rusty Russell | 6b95482 | 2009-01-01 10:12:25 +1030 | [diff] [blame] | 94 | extern struct cpumask *tick_get_broadcast_oneshot_mask(void); |
Ingo Molnar | 289f480 | 2007-02-16 01:28:15 -0800 | [diff] [blame] | 95 | # endif |
| 96 | |
| 97 | # endif /* BROADCAST */ |
| 98 | |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 99 | # ifdef CONFIG_TICK_ONESHOT |
| 100 | extern void tick_clock_notify(void); |
| 101 | extern int tick_check_oneshot_change(int allow_nohz); |
| 102 | extern struct tick_sched *tick_get_tick_sched(int cpu); |
Thomas Gleixner | 719254f | 2008-10-17 09:59:47 +0200 | [diff] [blame] | 103 | extern void tick_check_idle(int cpu); |
Thomas Gleixner | cd6d95d | 2009-06-12 11:29:27 +0200 | [diff] [blame] | 104 | extern int tick_oneshot_mode_active(void); |
Martin Schwidefsky | 3c5d92a | 2009-09-29 14:25:16 +0200 | [diff] [blame] | 105 | # ifndef arch_needs_cpu |
| 106 | # define arch_needs_cpu(cpu) (0) |
| 107 | # endif |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 108 | # else |
| 109 | static inline void tick_clock_notify(void) { } |
| 110 | static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } |
Thomas Gleixner | 719254f | 2008-10-17 09:59:47 +0200 | [diff] [blame] | 111 | static inline void tick_check_idle(int cpu) { } |
Thomas Gleixner | cd6d95d | 2009-06-12 11:29:27 +0200 | [diff] [blame] | 112 | static inline int tick_oneshot_mode_active(void) { return 0; } |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 113 | # endif |
| 114 | |
| 115 | #else /* CONFIG_GENERIC_CLOCKEVENTS */ |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 116 | static inline void tick_init(void) { } |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 117 | static inline void tick_cancel_sched_timer(int cpu) { } |
| 118 | static inline void tick_clock_notify(void) { } |
| 119 | static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } |
Thomas Gleixner | 719254f | 2008-10-17 09:59:47 +0200 | [diff] [blame] | 120 | static inline void tick_check_idle(int cpu) { } |
Thomas Gleixner | cd6d95d | 2009-06-12 11:29:27 +0200 | [diff] [blame] | 121 | static inline int tick_oneshot_mode_active(void) { return 0; } |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 122 | #endif /* !CONFIG_GENERIC_CLOCKEVENTS */ |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 123 | |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 124 | # ifdef CONFIG_NO_HZ |
Frederic Weisbecker | 2bbb681 | 2011-10-08 16:01:00 +0200 | [diff] [blame^] | 125 | extern void __tick_nohz_idle_enter(void); |
| 126 | static inline void tick_nohz_idle_enter(void) |
| 127 | { |
| 128 | local_irq_disable(); |
| 129 | __tick_nohz_idle_enter(); |
| 130 | local_irq_enable(); |
| 131 | } |
Frederic Weisbecker | 280f067 | 2011-10-07 18:22:06 +0200 | [diff] [blame] | 132 | extern void tick_nohz_idle_exit(void); |
Frederic Weisbecker | 2bbb681 | 2011-10-08 16:01:00 +0200 | [diff] [blame^] | 133 | |
| 134 | /* |
| 135 | * Call this pair of function if the arch doesn't make any use |
| 136 | * of RCU in-between. You won't need to call rcu_idle_enter() and |
| 137 | * rcu_idle_exit(). |
| 138 | * Otherwise you need to call tick_nohz_idle_enter() and tick_nohz_idle_exit() |
| 139 | * and explicitly tell RCU about the window around the place the CPU enters low |
| 140 | * power mode where no RCU use is made. This is done by calling rcu_idle_enter() |
| 141 | * after the last use of RCU before the CPU is put to sleep and by calling |
| 142 | * rcu_idle_exit() before the first use of RCU after the CPU woke up. |
| 143 | */ |
| 144 | static inline void tick_nohz_idle_enter_norcu(void) |
| 145 | { |
| 146 | /* |
| 147 | * Also call rcu_idle_enter() in the irq disabled section even |
| 148 | * if it disables irq itself. |
| 149 | * Just an optimization that prevents from an interrupt happening |
| 150 | * between it and __tick_nohz_idle_enter() to lose time to help |
| 151 | * completing a grace period while we could be in extended grace |
| 152 | * period already. |
| 153 | */ |
| 154 | local_irq_disable(); |
| 155 | __tick_nohz_idle_enter(); |
| 156 | rcu_idle_enter(); |
| 157 | local_irq_enable(); |
| 158 | } |
| 159 | static inline void tick_nohz_idle_exit_norcu(void) |
| 160 | { |
| 161 | rcu_idle_exit(); |
| 162 | tick_nohz_idle_exit(); |
| 163 | } |
Frederic Weisbecker | 280f067 | 2011-10-07 18:22:06 +0200 | [diff] [blame] | 164 | extern void tick_nohz_irq_exit(void); |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 165 | extern ktime_t tick_nohz_get_sleep_length(void); |
Venki Pallipadi | 6378ddb | 2008-01-30 13:30:04 +0100 | [diff] [blame] | 166 | extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); |
Arjan van de Ven | 0224cf4 | 2010-05-09 08:25:23 -0700 | [diff] [blame] | 167 | extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 168 | # else |
Frederic Weisbecker | 2bbb681 | 2011-10-08 16:01:00 +0200 | [diff] [blame^] | 169 | static inline void tick_nohz_idle_enter(void) { } |
| 170 | static inline void tick_nohz_idle_exit(void) { } |
| 171 | static inline void tick_nohz_idle_enter_norcu(void) |
Paul E. McKenney | 9b2e4f1 | 2011-09-30 12:10:22 -0700 | [diff] [blame] | 172 | { |
Frederic Weisbecker | 280f067 | 2011-10-07 18:22:06 +0200 | [diff] [blame] | 173 | rcu_idle_enter(); |
Paul E. McKenney | 9b2e4f1 | 2011-09-30 12:10:22 -0700 | [diff] [blame] | 174 | } |
Frederic Weisbecker | 2bbb681 | 2011-10-08 16:01:00 +0200 | [diff] [blame^] | 175 | static inline void tick_nohz_idle_exit_norcu(void) |
Paul E. McKenney | 9b2e4f1 | 2011-09-30 12:10:22 -0700 | [diff] [blame] | 176 | { |
| 177 | rcu_idle_exit(); |
| 178 | } |
Frederic Weisbecker | 280f067 | 2011-10-07 18:22:06 +0200 | [diff] [blame] | 179 | |
Len Brown | 4f86d3a | 2007-10-03 18:58:00 -0400 | [diff] [blame] | 180 | static inline ktime_t tick_nohz_get_sleep_length(void) |
| 181 | { |
| 182 | ktime_t len = { .tv64 = NSEC_PER_SEC/HZ }; |
| 183 | |
| 184 | return len; |
| 185 | } |
venkatesh.pallipadi@intel.com | 8083e4a | 2008-08-04 11:59:11 -0700 | [diff] [blame] | 186 | static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } |
Arjan van de Ven | 0224cf4 | 2010-05-09 08:25:23 -0700 | [diff] [blame] | 187 | static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 188 | # endif /* !NO_HZ */ |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 189 | |
| 190 | #endif |