1 /* 2 * Copyright IBM Corp. 2004 3 * 4 * Author: Martin Schwidefsky <schwidefsky@de.ibm.com> 5 */ 6 7 #ifndef _S390_CPUTIME_H 8 #define _S390_CPUTIME_H 9 10 #include <linux/types.h> 11 #include <asm/div64.h> 12 13 #define CPUTIME_PER_USEC 4096ULL 14 #define CPUTIME_PER_SEC (CPUTIME_PER_USEC * USEC_PER_SEC) 15 16 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */ 17 18 typedef unsigned long long __nocast cputime_t; 19 typedef unsigned long long __nocast cputime64_t; 20 21 #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new) 22 23 static inline unsigned long __div(unsigned long long n, unsigned long base) 24 { 25 return n / base; 26 } 27 28 #define cputime_one_jiffy jiffies_to_cputime(1) 29 30 /* 31 * Convert cputime to jiffies and back. 32 */ 33 static inline unsigned long cputime_to_jiffies(const cputime_t cputime) 34 { 35 return __div((__force unsigned long long) cputime, CPUTIME_PER_SEC / HZ); 36 } 37 38 static inline cputime_t jiffies_to_cputime(const unsigned int jif) 39 { 40 return (__force cputime_t)(jif * (CPUTIME_PER_SEC / HZ)); 41 } 42 43 static inline u64 cputime64_to_jiffies64(cputime64_t cputime) 44 { 45 unsigned long long jif = (__force unsigned long long) cputime; 46 do_div(jif, CPUTIME_PER_SEC / HZ); 47 return jif; 48 } 49 50 static inline cputime64_t jiffies64_to_cputime64(const u64 jif) 51 { 52 return (__force cputime64_t)(jif * (CPUTIME_PER_SEC / HZ)); 53 } 54 55 /* 56 * Convert cputime to microseconds and back. 57 */ 58 static inline unsigned int cputime_to_usecs(const cputime_t cputime) 59 { 60 return (__force unsigned long long) cputime >> 12; 61 } 62 63 static inline cputime_t usecs_to_cputime(const unsigned int m) 64 { 65 return (__force cputime_t)(m * CPUTIME_PER_USEC); 66 } 67 68 #define usecs_to_cputime64(m) usecs_to_cputime(m) 69 70 /* 71 * Convert cputime to milliseconds and back. 72 */ 73 static inline unsigned int cputime_to_secs(const cputime_t cputime) 74 { 75 return __div((__force unsigned long long) cputime, CPUTIME_PER_SEC / 2) >> 1; 76 } 77 78 static inline cputime_t secs_to_cputime(const unsigned int s) 79 { 80 return (__force cputime_t)(s * CPUTIME_PER_SEC); 81 } 82 83 /* 84 * Convert cputime to timespec and back. 85 */ 86 static inline cputime_t timespec_to_cputime(const struct timespec *value) 87 { 88 unsigned long long ret = value->tv_sec * CPUTIME_PER_SEC; 89 return (__force cputime_t)(ret + __div(value->tv_nsec * CPUTIME_PER_USEC, NSEC_PER_USEC)); 90 } 91 92 static inline void cputime_to_timespec(const cputime_t cputime, 93 struct timespec *value) 94 { 95 unsigned long long __cputime = (__force unsigned long long) cputime; 96 value->tv_nsec = (__cputime % CPUTIME_PER_SEC) * NSEC_PER_USEC / CPUTIME_PER_USEC; 97 value->tv_sec = __cputime / CPUTIME_PER_SEC; 98 } 99 100 /* 101 * Convert cputime to timeval and back. 102 * Since cputime and timeval have the same resolution (microseconds) 103 * this is easy. 104 */ 105 static inline cputime_t timeval_to_cputime(const struct timeval *value) 106 { 107 unsigned long long ret = value->tv_sec * CPUTIME_PER_SEC; 108 return (__force cputime_t)(ret + value->tv_usec * CPUTIME_PER_USEC); 109 } 110 111 static inline void cputime_to_timeval(const cputime_t cputime, 112 struct timeval *value) 113 { 114 unsigned long long __cputime = (__force unsigned long long) cputime; 115 value->tv_usec = (__cputime % CPUTIME_PER_SEC) / CPUTIME_PER_USEC; 116 value->tv_sec = __cputime / CPUTIME_PER_SEC; 117 } 118 119 /* 120 * Convert cputime to clock and back. 121 */ 122 static inline clock_t cputime_to_clock_t(cputime_t cputime) 123 { 124 unsigned long long clock = (__force unsigned long long) cputime; 125 do_div(clock, CPUTIME_PER_SEC / USER_HZ); 126 return clock; 127 } 128 129 static inline cputime_t clock_t_to_cputime(unsigned long x) 130 { 131 return (__force cputime_t)(x * (CPUTIME_PER_SEC / USER_HZ)); 132 } 133 134 /* 135 * Convert cputime64 to clock. 136 */ 137 static inline clock_t cputime64_to_clock_t(cputime64_t cputime) 138 { 139 unsigned long long clock = (__force unsigned long long) cputime; 140 do_div(clock, CPUTIME_PER_SEC / USER_HZ); 141 return clock; 142 } 143 144 cputime64_t arch_cpu_idle_time(int cpu); 145 146 #define arch_idle_time(cpu) arch_cpu_idle_time(cpu) 147 148 #endif /* _S390_CPUTIME_H */ 149