2 * include/asm-s390/cputime.h
4 * (C) Copyright IBM Corp. 2004
6 * Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
9 #ifndef _S390_CPUTIME_H
10 #define _S390_CPUTIME_H
12 #include <linux/types.h>
13 #include <linux/percpu.h>
14 #include <linux/spinlock.h>
15 #include <asm/div64.h>
17 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
19 typedef unsigned long long __nocast cputime_t;
20 typedef unsigned long long __nocast cputime64_t;
22 static inline unsigned long __div(unsigned long long n, unsigned long base)
28 asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
32 #endif /* __s390x__ */
35 #define cputime_one_jiffy jiffies_to_cputime(1)
38 * Convert cputime to jiffies and back.
40 static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
42 return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
45 static inline cputime_t jiffies_to_cputime(const unsigned int jif)
47 return (__force cputime_t)(jif * (4096000000ULL / HZ));
50 static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
52 unsigned long long jif = (__force unsigned long long) cputime;
53 do_div(jif, 4096000000ULL / HZ);
57 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
59 return (__force cputime64_t)(jif * (4096000000ULL / HZ));
63 * Convert cputime to microseconds and back.
65 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
67 return (__force unsigned long long) cputime >> 12;
70 static inline cputime_t usecs_to_cputime(const unsigned int m)
72 return (__force cputime_t)(m * 4096ULL);
75 #define usecs_to_cputime64(m) usecs_to_cputime(m)
78 * Convert cputime to milliseconds and back.
80 static inline unsigned int cputime_to_secs(const cputime_t cputime)
82 return __div((__force unsigned long long) cputime, 2048000000) >> 1;
85 static inline cputime_t secs_to_cputime(const unsigned int s)
87 return (__force cputime_t)(s * 4096000000ULL);
91 * Convert cputime to timespec and back.
93 static inline cputime_t timespec_to_cputime(const struct timespec *value)
95 unsigned long long ret = value->tv_sec * 4096000000ULL;
96 return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
99 static inline void cputime_to_timespec(const cputime_t cputime,
100 struct timespec *value)
102 unsigned long long __cputime = (__force unsigned long long) cputime;
106 rp.pair = __cputime >> 1;
107 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
108 value->tv_nsec = rp.subreg.even * 1000 / 4096;
109 value->tv_sec = rp.subreg.odd;
111 value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
112 value->tv_sec = __cputime / 4096000000ULL;
117 * Convert cputime to timeval and back.
118 * Since cputime and timeval have the same resolution (microseconds)
121 static inline cputime_t timeval_to_cputime(const struct timeval *value)
123 unsigned long long ret = value->tv_sec * 4096000000ULL;
124 return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
127 static inline void cputime_to_timeval(const cputime_t cputime,
128 struct timeval *value)
130 unsigned long long __cputime = (__force unsigned long long) cputime;
134 rp.pair = __cputime >> 1;
135 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
136 value->tv_usec = rp.subreg.even / 4096;
137 value->tv_sec = rp.subreg.odd;
139 value->tv_usec = (__cputime % 4096000000ULL) / 4096;
140 value->tv_sec = __cputime / 4096000000ULL;
145 * Convert cputime to clock and back.
147 static inline clock_t cputime_to_clock_t(cputime_t cputime)
149 unsigned long long clock = (__force unsigned long long) cputime;
150 do_div(clock, 4096000000ULL / USER_HZ);
154 static inline cputime_t clock_t_to_cputime(unsigned long x)
156 return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
160 * Convert cputime64 to clock.
162 static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
164 unsigned long long clock = (__force unsigned long long) cputime;
165 do_div(clock, 4096000000ULL / USER_HZ);
169 struct s390_idle_data {
170 unsigned int sequence;
171 unsigned long long idle_count;
172 unsigned long long idle_enter;
173 unsigned long long idle_exit;
174 unsigned long long idle_time;
178 DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
180 cputime64_t s390_get_idle_time(int cpu);
182 #define arch_idle_time(cpu) s390_get_idle_time(cpu)
184 static inline int s390_nohz_delay(int cpu)
186 return __get_cpu_var(s390_idle).nohz_delay != 0;
189 #define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
191 #endif /* _S390_CPUTIME_H */