xref: /openbmc/linux/arch/s390/include/asm/cputime.h (revision e2f1cf25) 
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