Commit | Line | Data |
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d7b4202e JS |
1 | /* |
2 | * You SHOULD NOT be including this unless you're vsyscall | |
3 | * handling code or timekeeping internal code! | |
4 | */ | |
5 | ||
6 | #ifndef _LINUX_TIMEKEEPER_INTERNAL_H | |
7 | #define _LINUX_TIMEKEEPER_INTERNAL_H | |
8 | ||
9 | #include <linux/clocksource.h> | |
10 | #include <linux/jiffies.h> | |
11 | #include <linux/time.h> | |
12 | ||
d28ede83 TG |
13 | /** |
14 | * struct tk_read_base - base structure for timekeeping readout | |
15 | * @clock: Current clocksource used for timekeeping. | |
16 | * @read: Read function of @clock | |
17 | * @mask: Bitmask for two's complement subtraction of non 64bit clocks | |
18 | * @cycle_last: @clock cycle value at last update | |
876e7881 | 19 | * @mult: (NTP adjusted) multiplier for scaled math conversion |
d28ede83 TG |
20 | * @shift: Shift value for scaled math conversion |
21 | * @xtime_nsec: Shifted (fractional) nano seconds offset for readout | |
876e7881 | 22 | * @base: ktime_t (nanoseconds) base time for readout |
3fdb14fd | 23 | * |
d28ede83 TG |
24 | * This struct has size 56 byte on 64 bit. Together with a seqcount it |
25 | * occupies a single 64byte cache line. | |
3fdb14fd | 26 | * |
d28ede83 | 27 | * The struct is separate from struct timekeeper as it is also used |
876e7881 | 28 | * for a fast NMI safe accessors. |
3fdb14fd | 29 | */ |
d28ede83 | 30 | struct tk_read_base { |
d7b4202e | 31 | struct clocksource *clock; |
6d3aadf3 | 32 | cycle_t (*read)(struct clocksource *cs); |
6d3aadf3 | 33 | cycle_t mask; |
4a0e6377 | 34 | cycle_t cycle_last; |
d7b4202e | 35 | u32 mult; |
d7b4202e | 36 | u32 shift; |
3fdb14fd | 37 | u64 xtime_nsec; |
876e7881 | 38 | ktime_t base; |
d28ede83 | 39 | }; |
7c032df5 | 40 | |
d28ede83 TG |
41 | /** |
42 | * struct timekeeper - Structure holding internal timekeeping values. | |
876e7881 | 43 | * @tkr_mono: The readout base structure for CLOCK_MONOTONIC |
4a4ad80d | 44 | * @tkr_raw: The readout base structure for CLOCK_MONOTONIC_RAW |
d28ede83 | 45 | * @xtime_sec: Current CLOCK_REALTIME time in seconds |
9e3680b1 | 46 | * @ktime_sec: Current CLOCK_MONOTONIC time in seconds |
d28ede83 TG |
47 | * @wall_to_monotonic: CLOCK_REALTIME to CLOCK_MONOTONIC offset |
48 | * @offs_real: Offset clock monotonic -> clock realtime | |
49 | * @offs_boot: Offset clock monotonic -> clock boottime | |
50 | * @offs_tai: Offset clock monotonic -> clock tai | |
51 | * @tai_offset: The current UTC to TAI offset in seconds | |
d28ede83 TG |
52 | * @raw_time: Monotonic raw base time in timespec64 format |
53 | * @cycle_interval: Number of clock cycles in one NTP interval | |
54 | * @xtime_interval: Number of clock shifted nano seconds in one NTP | |
55 | * interval. | |
56 | * @xtime_remainder: Shifted nano seconds left over when rounding | |
57 | * @cycle_interval | |
58 | * @raw_interval: Raw nano seconds accumulated per NTP interval. | |
59 | * @ntp_error: Difference between accumulated time and NTP time in ntp | |
60 | * shifted nano seconds. | |
61 | * @ntp_error_shift: Shift conversion between clock shifted nano seconds and | |
62 | * ntp shifted nano seconds. | |
63 | * | |
64 | * Note: For timespec(64) based interfaces wall_to_monotonic is what | |
65 | * we need to add to xtime (or xtime corrected for sub jiffie times) | |
66 | * to get to monotonic time. Monotonic is pegged at zero at system | |
67 | * boot time, so wall_to_monotonic will be negative, however, we will | |
68 | * ALWAYS keep the tv_nsec part positive so we can use the usual | |
69 | * normalization. | |
70 | * | |
71 | * wall_to_monotonic is moved after resume from suspend for the | |
72 | * monotonic time not to jump. We need to add total_sleep_time to | |
73 | * wall_to_monotonic to get the real boot based time offset. | |
74 | * | |
75 | * wall_to_monotonic is no longer the boot time, getboottime must be | |
76 | * used instead. | |
77 | */ | |
78 | struct timekeeper { | |
876e7881 | 79 | struct tk_read_base tkr_mono; |
4a4ad80d | 80 | struct tk_read_base tkr_raw; |
3fdb14fd | 81 | u64 xtime_sec; |
9e3680b1 | 82 | unsigned long ktime_sec; |
3fdb14fd | 83 | struct timespec64 wall_to_monotonic; |
3fdb14fd | 84 | ktime_t offs_real; |
3fdb14fd | 85 | ktime_t offs_boot; |
3fdb14fd | 86 | ktime_t offs_tai; |
3fdb14fd | 87 | s32 tai_offset; |
3fdb14fd TG |
88 | struct timespec64 raw_time; |
89 | ||
d28ede83 | 90 | /* The following members are for timekeeping internal use */ |
d7b4202e | 91 | cycle_t cycle_interval; |
d7b4202e | 92 | u64 xtime_interval; |
d7b4202e | 93 | s64 xtime_remainder; |
d7b4202e | 94 | u32 raw_interval; |
375f45b5 JS |
95 | /* The ntp_tick_length() value currently being used. |
96 | * This cached copy ensures we consistently apply the tick | |
97 | * length for an entire tick, as ntp_tick_length may change | |
98 | * mid-tick, and we don't want to apply that new value to | |
99 | * the tick in progress. | |
100 | */ | |
101 | u64 ntp_tick; | |
102 | /* Difference between accumulated time and NTP time in ntp | |
103 | * shifted nano seconds. */ | |
d7b4202e | 104 | s64 ntp_error; |
3fdb14fd | 105 | u32 ntp_error_shift; |
dc491596 | 106 | u32 ntp_err_mult; |
d7b4202e | 107 | }; |
189374ae | 108 | |
576094b7 JS |
109 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL |
110 | ||
111 | extern void update_vsyscall(struct timekeeper *tk); | |
112 | extern void update_vsyscall_tz(void); | |
189374ae | 113 | |
576094b7 JS |
114 | #elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD) |
115 | ||
116 | extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm, | |
4a0e6377 | 117 | struct clocksource *c, u32 mult, |
953dec21 | 118 | cycle_t cycle_last); |
189374ae | 119 | extern void update_vsyscall_tz(void); |
576094b7 | 120 | |
189374ae | 121 | #else |
576094b7 JS |
122 | |
123 | static inline void update_vsyscall(struct timekeeper *tk) | |
189374ae JS |
124 | { |
125 | } | |
126 | static inline void update_vsyscall_tz(void) | |
127 | { | |
128 | } | |
129 | #endif | |
130 | ||
d7b4202e | 131 | #endif /* _LINUX_TIMEKEEPER_INTERNAL_H */ |