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>
15 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
17 typedef unsigned long long __nocast cputime_t;
18 typedef unsigned long long __nocast cputime64_t;
20 static inline unsigned long __div(unsigned long long n, unsigned long base)
26 asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
28 #else /* CONFIG_64BIT */
30 #endif /* CONFIG_64BIT */
33 #define cputime_one_jiffy jiffies_to_cputime(1)
36 * Convert cputime to jiffies and back.
38 static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
40 return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
43 static inline cputime_t jiffies_to_cputime(const unsigned int jif)
45 return (__force cputime_t)(jif * (4096000000ULL / HZ));
48 static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
50 unsigned long long jif = (__force unsigned long long) cputime;
51 do_div(jif, 4096000000ULL / HZ);
55 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
57 return (__force cputime64_t)(jif * (4096000000ULL / HZ));
61 * Convert cputime to microseconds and back.
63 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
65 return (__force unsigned long long) cputime >> 12;
68 static inline cputime_t usecs_to_cputime(const unsigned int m)
70 return (__force cputime_t)(m * 4096ULL);
73 #define usecs_to_cputime64(m) usecs_to_cputime(m)
76 * Convert cputime to milliseconds and back.
78 static inline unsigned int cputime_to_secs(const cputime_t cputime)
80 return __div((__force unsigned long long) cputime, 2048000000) >> 1;
83 static inline cputime_t secs_to_cputime(const unsigned int s)
85 return (__force cputime_t)(s * 4096000000ULL);
89 * Convert cputime to timespec and back.
91 static inline cputime_t timespec_to_cputime(const struct timespec *value)
93 unsigned long long ret = value->tv_sec * 4096000000ULL;
94 return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
97 static inline void cputime_to_timespec(const cputime_t cputime,
98 struct timespec *value)
100 unsigned long long __cputime = (__force unsigned long long) cputime;
104 rp.pair = __cputime >> 1;
105 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
106 value->tv_nsec = rp.subreg.even * 1000 / 4096;
107 value->tv_sec = rp.subreg.odd;
109 value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
110 value->tv_sec = __cputime / 4096000000ULL;
115 * Convert cputime to timeval and back.
116 * Since cputime and timeval have the same resolution (microseconds)
119 static inline cputime_t timeval_to_cputime(const struct timeval *value)
121 unsigned long long ret = value->tv_sec * 4096000000ULL;
122 return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
125 static inline void cputime_to_timeval(const cputime_t cputime,
126 struct timeval *value)
128 unsigned long long __cputime = (__force unsigned long long) cputime;
132 rp.pair = __cputime >> 1;
133 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
134 value->tv_usec = rp.subreg.even / 4096;
135 value->tv_sec = rp.subreg.odd;
137 value->tv_usec = (__cputime % 4096000000ULL) / 4096;
138 value->tv_sec = __cputime / 4096000000ULL;
143 * Convert cputime to clock and back.
145 static inline clock_t cputime_to_clock_t(cputime_t cputime)
147 unsigned long long clock = (__force unsigned long long) cputime;
148 do_div(clock, 4096000000ULL / USER_HZ);
152 static inline cputime_t clock_t_to_cputime(unsigned long x)
154 return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
158 * Convert cputime64 to clock.
160 static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
162 unsigned long long clock = (__force unsigned long long) cputime;
163 do_div(clock, 4096000000ULL / USER_HZ);
167 struct s390_idle_data {
169 unsigned int sequence;
170 unsigned long long idle_count;
171 unsigned long long idle_enter;
172 unsigned long long idle_exit;
173 unsigned long long idle_time;
176 DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
178 cputime64_t s390_get_idle_time(int cpu);
180 #define arch_idle_time(cpu) s390_get_idle_time(cpu)
182 static inline int s390_nohz_delay(int cpu)
184 return __get_cpu_var(s390_idle).nohz_delay != 0;
187 #define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
189 #endif /* _S390_CPUTIME_H */