2 * Copyright IBM Corp. 2004
4 * Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
7 #ifndef _S390_CPUTIME_H
8 #define _S390_CPUTIME_H
10 #include <linux/types.h>
11 #include <linux/percpu.h>
12 #include <linux/spinlock.h>
13 #include <asm/div64.h>
16 #define __ARCH_HAS_VTIME_ACCOUNT
18 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
20 typedef unsigned long long __nocast cputime_t;
21 typedef unsigned long long __nocast cputime64_t;
23 static inline unsigned long __div(unsigned long long n, unsigned long base)
29 asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
31 #else /* CONFIG_64BIT */
33 #endif /* CONFIG_64BIT */
36 #define cputime_one_jiffy jiffies_to_cputime(1)
39 * Convert cputime to jiffies and back.
41 static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
43 return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
46 static inline cputime_t jiffies_to_cputime(const unsigned int jif)
48 return (__force cputime_t)(jif * (4096000000ULL / HZ));
51 static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
53 unsigned long long jif = (__force unsigned long long) cputime;
54 do_div(jif, 4096000000ULL / HZ);
58 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
60 return (__force cputime64_t)(jif * (4096000000ULL / HZ));
64 * Convert cputime to microseconds and back.
66 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
68 return (__force unsigned long long) cputime >> 12;
71 static inline cputime_t usecs_to_cputime(const unsigned int m)
73 return (__force cputime_t)(m * 4096ULL);
76 #define usecs_to_cputime64(m) usecs_to_cputime(m)
79 * Convert cputime to milliseconds and back.
81 static inline unsigned int cputime_to_secs(const cputime_t cputime)
83 return __div((__force unsigned long long) cputime, 2048000000) >> 1;
86 static inline cputime_t secs_to_cputime(const unsigned int s)
88 return (__force cputime_t)(s * 4096000000ULL);
92 * Convert cputime to timespec and back.
94 static inline cputime_t timespec_to_cputime(const struct timespec *value)
96 unsigned long long ret = value->tv_sec * 4096000000ULL;
97 return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
100 static inline void cputime_to_timespec(const cputime_t cputime,
101 struct timespec *value)
103 unsigned long long __cputime = (__force unsigned long long) cputime;
107 rp.pair = __cputime >> 1;
108 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
109 value->tv_nsec = rp.subreg.even * 1000 / 4096;
110 value->tv_sec = rp.subreg.odd;
112 value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
113 value->tv_sec = __cputime / 4096000000ULL;
118 * Convert cputime to timeval and back.
119 * Since cputime and timeval have the same resolution (microseconds)
122 static inline cputime_t timeval_to_cputime(const struct timeval *value)
124 unsigned long long ret = value->tv_sec * 4096000000ULL;
125 return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
128 static inline void cputime_to_timeval(const cputime_t cputime,
129 struct timeval *value)
131 unsigned long long __cputime = (__force unsigned long long) cputime;
135 rp.pair = __cputime >> 1;
136 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
137 value->tv_usec = rp.subreg.even / 4096;
138 value->tv_sec = rp.subreg.odd;
140 value->tv_usec = (__cputime % 4096000000ULL) / 4096;
141 value->tv_sec = __cputime / 4096000000ULL;
146 * Convert cputime to clock and back.
148 static inline clock_t cputime_to_clock_t(cputime_t cputime)
150 unsigned long long clock = (__force unsigned long long) cputime;
151 do_div(clock, 4096000000ULL / USER_HZ);
155 static inline cputime_t clock_t_to_cputime(unsigned long x)
157 return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
161 * Convert cputime64 to clock.
163 static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
165 unsigned long long clock = (__force unsigned long long) cputime;
166 do_div(clock, 4096000000ULL / USER_HZ);
170 struct s390_idle_data {
172 unsigned int sequence;
173 unsigned long long idle_count;
174 unsigned long long idle_time;
175 unsigned long long clock_idle_enter;
176 unsigned long long clock_idle_exit;
177 unsigned long long timer_idle_enter;
178 unsigned long long timer_idle_exit;
181 DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
183 cputime64_t s390_get_idle_time(int cpu);
185 #define arch_idle_time(cpu) s390_get_idle_time(cpu)
187 static inline int s390_nohz_delay(int cpu)
189 return __get_cpu_var(s390_idle).nohz_delay != 0;
192 #define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
194 #endif /* _S390_CPUTIME_H */