1 /* 2 * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk}) 3 * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de) 4 * Copyright (C) 2012-2014 Cisco Systems 5 * Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com) 6 * Licensed under the GPL 7 */ 8 9 #include <stddef.h> 10 #include <errno.h> 11 #include <signal.h> 12 #include <time.h> 13 #include <sys/time.h> 14 #include <kern_util.h> 15 #include <os.h> 16 #include <string.h> 17 #include <timer-internal.h> 18 19 static timer_t event_high_res_timer = 0; 20 21 static inline long long timeval_to_ns(const struct timeval *tv) 22 { 23 return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) + 24 tv->tv_usec * UM_NSEC_PER_USEC; 25 } 26 27 static inline long long timespec_to_ns(const struct timespec *ts) 28 { 29 return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) + 30 ts->tv_nsec; 31 } 32 33 long long os_persistent_clock_emulation (void) { 34 struct timespec realtime_tp; 35 36 clock_gettime(CLOCK_REALTIME, &realtime_tp); 37 return timespec_to_ns(&realtime_tp); 38 } 39 40 /** 41 * os_timer_create() - create an new posix (interval) timer 42 */ 43 int os_timer_create(void* timer) { 44 45 timer_t* t = timer; 46 47 if(t == NULL) { 48 t = &event_high_res_timer; 49 } 50 51 if (timer_create( 52 CLOCK_MONOTONIC, 53 NULL, 54 t) == -1) { 55 return -1; 56 } 57 return 0; 58 } 59 60 int os_timer_set_interval(void* timer, void* i) 61 { 62 struct itimerspec its; 63 unsigned long long nsec; 64 timer_t* t = timer; 65 struct itimerspec* its_in = i; 66 67 if(t == NULL) { 68 t = &event_high_res_timer; 69 } 70 71 nsec = UM_NSEC_PER_SEC / UM_HZ; 72 73 if(its_in != NULL) { 74 its.it_value.tv_sec = its_in->it_value.tv_sec; 75 its.it_value.tv_nsec = its_in->it_value.tv_nsec; 76 } else { 77 its.it_value.tv_sec = 0; 78 its.it_value.tv_nsec = nsec; 79 } 80 81 its.it_interval.tv_sec = 0; 82 its.it_interval.tv_nsec = nsec; 83 84 if(timer_settime(*t, 0, &its, NULL) == -1) { 85 return -errno; 86 } 87 88 return 0; 89 } 90 91 /** 92 * os_timer_remain() - returns the remaining nano seconds of the given interval 93 * timer 94 * Because this is the remaining time of an interval timer, which correspondends 95 * to HZ, this value can never be bigger than one second. Just 96 * the nanosecond part of the timer is returned. 97 * The returned time is relative to the start time of the interval timer. 98 * Return an negative value in an error case. 99 */ 100 long os_timer_remain(void* timer) 101 { 102 struct itimerspec its; 103 timer_t* t = timer; 104 105 if(t == NULL) { 106 t = &event_high_res_timer; 107 } 108 109 if(timer_gettime(t, &its) == -1) { 110 return -errno; 111 } 112 113 return its.it_value.tv_nsec; 114 } 115 116 int os_timer_one_shot(int ticks) 117 { 118 struct itimerspec its; 119 unsigned long long nsec; 120 unsigned long sec; 121 122 nsec = (ticks + 1); 123 sec = nsec / UM_NSEC_PER_SEC; 124 nsec = nsec % UM_NSEC_PER_SEC; 125 126 its.it_value.tv_sec = nsec / UM_NSEC_PER_SEC; 127 its.it_value.tv_nsec = nsec; 128 129 its.it_interval.tv_sec = 0; 130 its.it_interval.tv_nsec = 0; // we cheat here 131 132 timer_settime(event_high_res_timer, 0, &its, NULL); 133 return 0; 134 } 135 136 /** 137 * os_timer_disable() - disable the posix (interval) timer 138 * Returns the remaining interval timer time in nanoseconds 139 */ 140 long long os_timer_disable(void) 141 { 142 struct itimerspec its; 143 144 memset(&its, 0, sizeof(struct itimerspec)); 145 timer_settime(event_high_res_timer, 0, &its, &its); 146 147 return its.it_value.tv_sec * UM_NSEC_PER_SEC + its.it_value.tv_nsec; 148 } 149 150 long long os_vnsecs(void) 151 { 152 struct timespec ts; 153 154 clock_gettime(CLOCK_PROCESS_CPUTIME_ID,&ts); 155 return timespec_to_ns(&ts); 156 } 157 158 long long os_nsecs(void) 159 { 160 struct timespec ts; 161 162 clock_gettime(CLOCK_MONOTONIC,&ts); 163 return timespec_to_ns(&ts); 164 } 165 166 /** 167 * os_idle_sleep() - sleep for a given time of nsecs 168 * @nsecs: nanoseconds to sleep 169 */ 170 void os_idle_sleep(unsigned long long nsecs) 171 { 172 struct timespec ts; 173 174 if (nsecs <= 0) { 175 return; 176 } 177 178 ts = ((struct timespec) { 179 .tv_sec = nsecs / UM_NSEC_PER_SEC, 180 .tv_nsec = nsecs % UM_NSEC_PER_SEC 181 }); 182 183 /* 184 * Relay the signal if clock_nanosleep is interrupted. 185 */ 186 if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL)) { 187 deliver_alarm(); 188 } 189 } 190