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Linux kernel mirror (for testing)
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linux
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 <linux/percpu.h>
12#include <linux/spinlock.h>
13#include <asm/div64.h>
14
15
16#define __ARCH_HAS_VTIME_ACCOUNT
17#define __ARCH_HAS_VTIME_TASK_SWITCH
18
19/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
20
21typedef unsigned long long __nocast cputime_t;
22typedef unsigned long long __nocast cputime64_t;
23
24static inline unsigned long __div(unsigned long long n, unsigned long base)
25{
26#ifndef CONFIG_64BIT
27 register_pair rp;
28
29 rp.pair = n >> 1;
30 asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
31 return rp.subreg.odd;
32#else /* CONFIG_64BIT */
33 return n / base;
34#endif /* CONFIG_64BIT */
35}
36
37#define cputime_one_jiffy jiffies_to_cputime(1)
38
39/*
40 * Convert cputime to jiffies and back.
41 */
42static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
43{
44 return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
45}
46
47static inline cputime_t jiffies_to_cputime(const unsigned int jif)
48{
49 return (__force cputime_t)(jif * (4096000000ULL / HZ));
50}
51
52static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
53{
54 unsigned long long jif = (__force unsigned long long) cputime;
55 do_div(jif, 4096000000ULL / HZ);
56 return jif;
57}
58
59static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
60{
61 return (__force cputime64_t)(jif * (4096000000ULL / HZ));
62}
63
64/*
65 * Convert cputime to microseconds and back.
66 */
67static inline unsigned int cputime_to_usecs(const cputime_t cputime)
68{
69 return (__force unsigned long long) cputime >> 12;
70}
71
72static inline cputime_t usecs_to_cputime(const unsigned int m)
73{
74 return (__force cputime_t)(m * 4096ULL);
75}
76
77#define usecs_to_cputime64(m) usecs_to_cputime(m)
78
79/*
80 * Convert cputime to milliseconds and back.
81 */
82static inline unsigned int cputime_to_secs(const cputime_t cputime)
83{
84 return __div((__force unsigned long long) cputime, 2048000000) >> 1;
85}
86
87static inline cputime_t secs_to_cputime(const unsigned int s)
88{
89 return (__force cputime_t)(s * 4096000000ULL);
90}
91
92/*
93 * Convert cputime to timespec and back.
94 */
95static inline cputime_t timespec_to_cputime(const struct timespec *value)
96{
97 unsigned long long ret = value->tv_sec * 4096000000ULL;
98 return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
99}
100
101static inline void cputime_to_timespec(const cputime_t cputime,
102 struct timespec *value)
103{
104 unsigned long long __cputime = (__force unsigned long long) cputime;
105#ifndef CONFIG_64BIT
106 register_pair rp;
107
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;
112#else
113 value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
114 value->tv_sec = __cputime / 4096000000ULL;
115#endif
116}
117
118/*
119 * Convert cputime to timeval and back.
120 * Since cputime and timeval have the same resolution (microseconds)
121 * this is easy.
122 */
123static inline cputime_t timeval_to_cputime(const struct timeval *value)
124{
125 unsigned long long ret = value->tv_sec * 4096000000ULL;
126 return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
127}
128
129static inline void cputime_to_timeval(const cputime_t cputime,
130 struct timeval *value)
131{
132 unsigned long long __cputime = (__force unsigned long long) cputime;
133#ifndef CONFIG_64BIT
134 register_pair rp;
135
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;
140#else
141 value->tv_usec = (__cputime % 4096000000ULL) / 4096;
142 value->tv_sec = __cputime / 4096000000ULL;
143#endif
144}
145
146/*
147 * Convert cputime to clock and back.
148 */
149static inline clock_t cputime_to_clock_t(cputime_t cputime)
150{
151 unsigned long long clock = (__force unsigned long long) cputime;
152 do_div(clock, 4096000000ULL / USER_HZ);
153 return clock;
154}
155
156static inline cputime_t clock_t_to_cputime(unsigned long x)
157{
158 return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
159}
160
161/*
162 * Convert cputime64 to clock.
163 */
164static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
165{
166 unsigned long long clock = (__force unsigned long long) cputime;
167 do_div(clock, 4096000000ULL / USER_HZ);
168 return clock;
169}
170
171struct s390_idle_data {
172 int nohz_delay;
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;
180};
181
182DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
183
184cputime64_t s390_get_idle_time(int cpu);
185
186#define arch_idle_time(cpu) s390_get_idle_time(cpu)
187
188static inline int s390_nohz_delay(int cpu)
189{
190 return __get_cpu_var(s390_idle).nohz_delay != 0;
191}
192
193#define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
194
195#endif /* _S390_CPUTIME_H */