thinkpad-acpi: constrain IBM-era support to IBM boxes
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / tick.h
blobd2ae79e21be3a4aee4fe1cd8dde51d272d7b97dc
1 /* linux/include/linux/tick.h
3 * This file contains the structure definitions for tick related functions
5 */
6 #ifndef _LINUX_TICK_H
7 #define _LINUX_TICK_H
9 #include <linux/clockchips.h>
11 #ifdef CONFIG_GENERIC_CLOCKEVENTS
13 enum tick_device_mode {
14 TICKDEV_MODE_PERIODIC,
15 TICKDEV_MODE_ONESHOT,
18 struct tick_device {
19 struct clock_event_device *evtdev;
20 enum tick_device_mode mode;
23 enum tick_nohz_mode {
24 NOHZ_MODE_INACTIVE,
25 NOHZ_MODE_LOWRES,
26 NOHZ_MODE_HIGHRES,
29 /**
30 * struct tick_sched - sched tick emulation and no idle tick control/stats
31 * @sched_timer: hrtimer to schedule the periodic tick in high
32 * resolution mode
33 * @idle_tick: Store the last idle tick expiry time when the tick
34 * timer is modified for idle sleeps. This is necessary
35 * to resume the tick timer operation in the timeline
36 * when the CPU returns from idle
37 * @tick_stopped: Indicator that the idle tick has been stopped
38 * @idle_jiffies: jiffies at the entry to idle for idle time accounting
39 * @idle_calls: Total number of idle calls
40 * @idle_sleeps: Number of idle calls, where the sched tick was stopped
41 * @idle_entrytime: Time when the idle call was entered
42 * @idle_waketime: Time when the idle was interrupted
43 * @idle_exittime: Time when the idle state was left
44 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
45 * @sleep_length: Duration of the current idle sleep
46 * @do_timer_lst: CPU was the last one doing do_timer before going idle
48 struct tick_sched {
49 struct hrtimer sched_timer;
50 unsigned long check_clocks;
51 enum tick_nohz_mode nohz_mode;
52 ktime_t idle_tick;
53 int inidle;
54 int tick_stopped;
55 unsigned long idle_jiffies;
56 unsigned long idle_calls;
57 unsigned long idle_sleeps;
58 int idle_active;
59 ktime_t idle_entrytime;
60 ktime_t idle_waketime;
61 ktime_t idle_exittime;
62 ktime_t idle_sleeptime;
63 ktime_t idle_lastupdate;
64 ktime_t sleep_length;
65 unsigned long last_jiffies;
66 unsigned long next_jiffies;
67 ktime_t idle_expires;
68 int do_timer_last;
71 extern void __init tick_init(void);
72 extern int tick_is_oneshot_available(void);
73 extern struct tick_device *tick_get_device(int cpu);
75 # ifdef CONFIG_HIGH_RES_TIMERS
76 extern int tick_init_highres(void);
77 extern int tick_program_event(ktime_t expires, int force);
78 extern void tick_setup_sched_timer(void);
79 # endif
81 # if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS
82 extern void tick_cancel_sched_timer(int cpu);
83 # else
84 static inline void tick_cancel_sched_timer(int cpu) { }
85 # endif
87 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
88 extern struct tick_device *tick_get_broadcast_device(void);
89 extern struct cpumask *tick_get_broadcast_mask(void);
91 # ifdef CONFIG_TICK_ONESHOT
92 extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
93 # endif
95 # endif /* BROADCAST */
97 # ifdef CONFIG_TICK_ONESHOT
98 extern void tick_clock_notify(void);
99 extern int tick_check_oneshot_change(int allow_nohz);
100 extern struct tick_sched *tick_get_tick_sched(int cpu);
101 extern void tick_check_idle(int cpu);
102 extern int tick_oneshot_mode_active(void);
103 # ifndef arch_needs_cpu
104 # define arch_needs_cpu(cpu) (0)
105 # endif
106 # else
107 static inline void tick_clock_notify(void) { }
108 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
109 static inline void tick_check_idle(int cpu) { }
110 static inline int tick_oneshot_mode_active(void) { return 0; }
111 # endif
113 #else /* CONFIG_GENERIC_CLOCKEVENTS */
114 static inline void tick_init(void) { }
115 static inline void tick_cancel_sched_timer(int cpu) { }
116 static inline void tick_clock_notify(void) { }
117 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
118 static inline void tick_check_idle(int cpu) { }
119 static inline int tick_oneshot_mode_active(void) { return 0; }
120 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
122 # ifdef CONFIG_NO_HZ
123 extern void tick_nohz_stop_sched_tick(int inidle);
124 extern void tick_nohz_restart_sched_tick(void);
125 extern ktime_t tick_nohz_get_sleep_length(void);
126 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
127 # else
128 static inline void tick_nohz_stop_sched_tick(int inidle) { }
129 static inline void tick_nohz_restart_sched_tick(void) { }
130 static inline ktime_t tick_nohz_get_sleep_length(void)
132 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
134 return len;
136 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
137 # endif /* !NO_HZ */
139 #endif