1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _TIMEKEEPING_INTERNAL_H 3 #define _TIMEKEEPING_INTERNAL_H 4 5 #include <linux/clocksource.h> 6 #include <linux/spinlock.h> 7 #include <linux/time.h> 8 9 struct timekeeper; 10 11 /* 12 * timekeeping debug functions 13 */ 14 #ifdef CONFIG_DEBUG_FS 15 16 DECLARE_PER_CPU(unsigned long, timekeeping_mg_floor_swaps); 17 18 static inline void timekeeping_inc_mg_floor_swaps(void) 19 { 20 this_cpu_inc(timekeeping_mg_floor_swaps); 21 } 22 23 extern void tk_debug_account_sleep_time(const struct timespec64 *t); 24 25 #else 26 27 #define tk_debug_account_sleep_time(x) 28 29 static inline void timekeeping_inc_mg_floor_swaps(void) 30 { 31 } 32 33 #endif 34 35 static inline u64 clocksource_delta(u64 now, u64 last, u64 mask, u64 max_delta) 36 { 37 u64 ret = (now - last) & mask; 38 39 /* 40 * Prevent time going backwards by checking the result against 41 * @max_delta. If greater, return 0. 42 */ 43 return ret > max_delta ? 0 : ret; 44 } 45 46 /* Semi public for serialization of non timekeeper VDSO updates. */ 47 unsigned long timekeeper_lock_irqsave(void); 48 void timekeeper_unlock_irqrestore(unsigned long flags); 49 50 /* NTP specific interface to access the current seconds value */ 51 long ktime_get_ntp_seconds(unsigned int id); 52 53 #ifdef CONFIG_GENERIC_GETTIMEOFDAY 54 55 extern void update_vsyscall(struct timekeeper *tk); 56 extern void update_vsyscall_tz(void); 57 extern void vdso_time_update_aux(struct timekeeper *tk); 58 59 #else 60 61 static inline void update_vsyscall(struct timekeeper *tk) 62 { 63 } 64 static inline void update_vsyscall_tz(void) 65 { 66 } 67 static inline void vdso_time_update_aux(struct timekeeper *tk) 68 { 69 } 70 #endif 71 72 #endif /* _TIMEKEEPING_INTERNAL_H */ 73