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
17 #define __ARCH_HAS_VTIME_TASK_SWITCH
19 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
21 typedef unsigned long long __nocast cputime_t;
22 typedef unsigned long long __nocast cputime64_t;
24 static inline unsigned long __div(unsigned long long n, unsigned long base)
30 asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
32 #else /* CONFIG_64BIT */
34 #endif /* CONFIG_64BIT */
37 #define cputime_one_jiffy jiffies_to_cputime(1)
40 * Convert cputime to jiffies and back.
42 static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
44 return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
47 static inline cputime_t jiffies_to_cputime(const unsigned int jif)
49 return (__force cputime_t)(jif * (4096000000ULL / HZ));
52 static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
54 unsigned long long jif = (__force unsigned long long) cputime;
55 do_div(jif, 4096000000ULL / HZ);
59 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
61 return (__force cputime64_t)(jif * (4096000000ULL / HZ));
65 * Convert cputime to microseconds and back.
67 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
69 return (__force unsigned long long) cputime >> 12;
72 static inline cputime_t usecs_to_cputime(const unsigned int m)
74 return (__force cputime_t)(m * 4096ULL);
77 #define usecs_to_cputime64(m) usecs_to_cputime(m)
80 * Convert cputime to milliseconds and back.
82 static inline unsigned int cputime_to_secs(const cputime_t cputime)
84 return __div((__force unsigned long long) cputime, 2048000000) >> 1;
87 static inline cputime_t secs_to_cputime(const unsigned int s)
89 return (__force cputime_t)(s * 4096000000ULL);
93 * Convert cputime to timespec and back.
95 static inline cputime_t timespec_to_cputime(const struct timespec *value)
97 unsigned long long ret = value->tv_sec * 4096000000ULL;
98 return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
101 static inline void cputime_to_timespec(const cputime_t cputime,
102 struct timespec *value)
104 unsigned long long __cputime = (__force unsigned long long) cputime;
108 rp.pair = __cputime >> 1;
109 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
110 value->tv_nsec = rp.subreg.even * 1000 / 4096;
111 value->tv_sec = rp.subreg.odd;
113 value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
114 value->tv_sec = __cputime / 4096000000ULL;
119 * Convert cputime to timeval and back.
120 * Since cputime and timeval have the same resolution (microseconds)
123 static inline cputime_t timeval_to_cputime(const struct timeval *value)
125 unsigned long long ret = value->tv_sec * 4096000000ULL;
126 return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
129 static inline void cputime_to_timeval(const cputime_t cputime,
130 struct timeval *value)
132 unsigned long long __cputime = (__force unsigned long long) cputime;
136 rp.pair = __cputime >> 1;
137 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
138 value->tv_usec = rp.subreg.even / 4096;
139 value->tv_sec = rp.subreg.odd;
141 value->tv_usec = (__cputime % 4096000000ULL) / 4096;
142 value->tv_sec = __cputime / 4096000000ULL;
147 * Convert cputime to clock and back.
149 static inline clock_t cputime_to_clock_t(cputime_t cputime)
151 unsigned long long clock = (__force unsigned long long) cputime;
152 do_div(clock, 4096000000ULL / USER_HZ);
156 static inline cputime_t clock_t_to_cputime(unsigned long x)
158 return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
162 * Convert cputime64 to clock.
164 static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
166 unsigned long long clock = (__force unsigned long long) cputime;
167 do_div(clock, 4096000000ULL / USER_HZ);
171 struct s390_idle_data {
173 unsigned int sequence;
174 unsigned long long idle_count;
175 unsigned long long idle_time;
176 unsigned long long clock_idle_enter;
177 unsigned long long clock_idle_exit;
178 unsigned long long timer_idle_enter;
179 unsigned long long timer_idle_exit;
182 DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
184 cputime64_t s390_get_idle_time(int cpu);
186 #define arch_idle_time(cpu) s390_get_idle_time(cpu)
188 static inline int s390_nohz_delay(int cpu)
190 return __get_cpu_var(s390_idle).nohz_delay != 0;
193 #define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
195 #endif /* _S390_CPUTIME_H */