1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _TIMEKEEPING_INTERNAL_H 3*4882a593Smuzhiyun #define _TIMEKEEPING_INTERNAL_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/clocksource.h> 6*4882a593Smuzhiyun #include <linux/spinlock.h> 7*4882a593Smuzhiyun #include <linux/time.h> 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun /* 10*4882a593Smuzhiyun * timekeeping debug functions 11*4882a593Smuzhiyun */ 12*4882a593Smuzhiyun #ifdef CONFIG_DEBUG_FS 13*4882a593Smuzhiyun extern void tk_debug_account_sleep_time(const struct timespec64 *t); 14*4882a593Smuzhiyun #else 15*4882a593Smuzhiyun #define tk_debug_account_sleep_time(x) 16*4882a593Smuzhiyun #endif 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun #ifdef CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE clocksource_delta(u64 now,u64 last,u64 mask)19*4882a593Smuzhiyunstatic inline u64 clocksource_delta(u64 now, u64 last, u64 mask) 20*4882a593Smuzhiyun { 21*4882a593Smuzhiyun u64 ret = (now - last) & mask; 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun /* 24*4882a593Smuzhiyun * Prevent time going backwards by checking the MSB of mask in 25*4882a593Smuzhiyun * the result. If set, return 0. 26*4882a593Smuzhiyun */ 27*4882a593Smuzhiyun return ret & ~(mask >> 1) ? 0 : ret; 28*4882a593Smuzhiyun } 29*4882a593Smuzhiyun #else clocksource_delta(u64 now,u64 last,u64 mask)30*4882a593Smuzhiyunstatic inline u64 clocksource_delta(u64 now, u64 last, u64 mask) 31*4882a593Smuzhiyun { 32*4882a593Smuzhiyun return (now - last) & mask; 33*4882a593Smuzhiyun } 34*4882a593Smuzhiyun #endif 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun /* Semi public for serialization of non timekeeper VDSO updates. */ 37*4882a593Smuzhiyun extern raw_spinlock_t timekeeper_lock; 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun #endif /* _TIMEKEEPING_INTERNAL_H */ 40