xref: /openbmc/linux/arch/powerpc/include/asm/cputime.h (revision e23feb16)
1 /*
2  * Definitions for measuring cputime on powerpc machines.
3  *
4  * Copyright (C) 2006 Paul Mackerras, IBM Corp.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  *
11  * If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in
12  * the same units as the timebase.  Otherwise we measure cpu time
13  * in jiffies using the generic definitions.
14  */
15 
16 #ifndef __POWERPC_CPUTIME_H
17 #define __POWERPC_CPUTIME_H
18 
19 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
20 #include <asm-generic/cputime.h>
21 #ifdef __KERNEL__
22 static inline void setup_cputime_one_jiffy(void) { }
23 #endif
24 #else
25 
26 #include <linux/types.h>
27 #include <linux/time.h>
28 #include <asm/div64.h>
29 #include <asm/time.h>
30 #include <asm/param.h>
31 
32 typedef u64 __nocast cputime_t;
33 typedef u64 __nocast cputime64_t;
34 
35 #ifdef __KERNEL__
36 
37 /*
38  * One jiffy in timebase units computed during initialization
39  */
40 extern cputime_t cputime_one_jiffy;
41 
42 /*
43  * Convert cputime <-> jiffies
44  */
45 extern u64 __cputime_jiffies_factor;
46 DECLARE_PER_CPU(unsigned long, cputime_last_delta);
47 DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta);
48 
49 static inline unsigned long cputime_to_jiffies(const cputime_t ct)
50 {
51 	return mulhdu((__force u64) ct, __cputime_jiffies_factor);
52 }
53 
54 /* Estimate the scaled cputime by scaling the real cputime based on
55  * the last scaled to real ratio */
56 static inline cputime_t cputime_to_scaled(const cputime_t ct)
57 {
58 	if (cpu_has_feature(CPU_FTR_SPURR) &&
59 	    __get_cpu_var(cputime_last_delta))
60 		return (__force u64) ct *
61 			__get_cpu_var(cputime_scaled_last_delta) /
62 			__get_cpu_var(cputime_last_delta);
63 	return ct;
64 }
65 
66 static inline cputime_t jiffies_to_cputime(const unsigned long jif)
67 {
68 	u64 ct;
69 	unsigned long sec;
70 
71 	/* have to be a little careful about overflow */
72 	ct = jif % HZ;
73 	sec = jif / HZ;
74 	if (ct) {
75 		ct *= tb_ticks_per_sec;
76 		do_div(ct, HZ);
77 	}
78 	if (sec)
79 		ct += (cputime_t) sec * tb_ticks_per_sec;
80 	return (__force cputime_t) ct;
81 }
82 
83 static inline void setup_cputime_one_jiffy(void)
84 {
85 	cputime_one_jiffy = jiffies_to_cputime(1);
86 }
87 
88 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
89 {
90 	u64 ct;
91 	u64 sec;
92 
93 	/* have to be a little careful about overflow */
94 	ct = jif % HZ;
95 	sec = jif / HZ;
96 	if (ct) {
97 		ct *= tb_ticks_per_sec;
98 		do_div(ct, HZ);
99 	}
100 	if (sec)
101 		ct += (u64) sec * tb_ticks_per_sec;
102 	return (__force cputime64_t) ct;
103 }
104 
105 static inline u64 cputime64_to_jiffies64(const cputime_t ct)
106 {
107 	return mulhdu((__force u64) ct, __cputime_jiffies_factor);
108 }
109 
110 /*
111  * Convert cputime <-> microseconds
112  */
113 extern u64 __cputime_usec_factor;
114 
115 static inline unsigned long cputime_to_usecs(const cputime_t ct)
116 {
117 	return mulhdu((__force u64) ct, __cputime_usec_factor);
118 }
119 
120 static inline cputime_t usecs_to_cputime(const unsigned long us)
121 {
122 	u64 ct;
123 	unsigned long sec;
124 
125 	/* have to be a little careful about overflow */
126 	ct = us % 1000000;
127 	sec = us / 1000000;
128 	if (ct) {
129 		ct *= tb_ticks_per_sec;
130 		do_div(ct, 1000000);
131 	}
132 	if (sec)
133 		ct += (cputime_t) sec * tb_ticks_per_sec;
134 	return (__force cputime_t) ct;
135 }
136 
137 #define usecs_to_cputime64(us)		usecs_to_cputime(us)
138 
139 /*
140  * Convert cputime <-> seconds
141  */
142 extern u64 __cputime_sec_factor;
143 
144 static inline unsigned long cputime_to_secs(const cputime_t ct)
145 {
146 	return mulhdu((__force u64) ct, __cputime_sec_factor);
147 }
148 
149 static inline cputime_t secs_to_cputime(const unsigned long sec)
150 {
151 	return (__force cputime_t)((u64) sec * tb_ticks_per_sec);
152 }
153 
154 /*
155  * Convert cputime <-> timespec
156  */
157 static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
158 {
159 	u64 x = (__force u64) ct;
160 	unsigned int frac;
161 
162 	frac = do_div(x, tb_ticks_per_sec);
163 	p->tv_sec = x;
164 	x = (u64) frac * 1000000000;
165 	do_div(x, tb_ticks_per_sec);
166 	p->tv_nsec = x;
167 }
168 
169 static inline cputime_t timespec_to_cputime(const struct timespec *p)
170 {
171 	u64 ct;
172 
173 	ct = (u64) p->tv_nsec * tb_ticks_per_sec;
174 	do_div(ct, 1000000000);
175 	return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
176 }
177 
178 /*
179  * Convert cputime <-> timeval
180  */
181 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *p)
182 {
183 	u64 x = (__force u64) ct;
184 	unsigned int frac;
185 
186 	frac = do_div(x, tb_ticks_per_sec);
187 	p->tv_sec = x;
188 	x = (u64) frac * 1000000;
189 	do_div(x, tb_ticks_per_sec);
190 	p->tv_usec = x;
191 }
192 
193 static inline cputime_t timeval_to_cputime(const struct timeval *p)
194 {
195 	u64 ct;
196 
197 	ct = (u64) p->tv_usec * tb_ticks_per_sec;
198 	do_div(ct, 1000000);
199 	return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
200 }
201 
202 /*
203  * Convert cputime <-> clock_t (units of 1/USER_HZ seconds)
204  */
205 extern u64 __cputime_clockt_factor;
206 
207 static inline unsigned long cputime_to_clock_t(const cputime_t ct)
208 {
209 	return mulhdu((__force u64) ct, __cputime_clockt_factor);
210 }
211 
212 static inline cputime_t clock_t_to_cputime(const unsigned long clk)
213 {
214 	u64 ct;
215 	unsigned long sec;
216 
217 	/* have to be a little careful about overflow */
218 	ct = clk % USER_HZ;
219 	sec = clk / USER_HZ;
220 	if (ct) {
221 		ct *= tb_ticks_per_sec;
222 		do_div(ct, USER_HZ);
223 	}
224 	if (sec)
225 		ct += (u64) sec * tb_ticks_per_sec;
226 	return (__force cputime_t) ct;
227 }
228 
229 #define cputime64_to_clock_t(ct)	cputime_to_clock_t((cputime_t)(ct))
230 
231 static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
232 
233 #endif /* __KERNEL__ */
234 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
235 #endif /* __POWERPC_CPUTIME_H */
236