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__
22static 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
32typedef u64 __nocast cputime_t;
33typedef u64 __nocast cputime64_t;
34
35#define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
36
37#ifdef __KERNEL__
38
39/*
40 * One jiffy in timebase units computed during initialization
41 */
42extern cputime_t cputime_one_jiffy;
43
44/*
45 * Convert cputime <-> jiffies
46 */
47extern u64 __cputime_jiffies_factor;
48DECLARE_PER_CPU(unsigned long, cputime_last_delta);
49DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta);
50
51static inline unsigned long cputime_to_jiffies(const cputime_t ct)
52{
53	return mulhdu((__force u64) ct, __cputime_jiffies_factor);
54}
55
56/* Estimate the scaled cputime by scaling the real cputime based on
57 * the last scaled to real ratio */
58static inline cputime_t cputime_to_scaled(const cputime_t ct)
59{
60	if (cpu_has_feature(CPU_FTR_SPURR) &&
61	    __this_cpu_read(cputime_last_delta))
62		return (__force u64) ct *
63			__this_cpu_read(cputime_scaled_last_delta) /
64			__this_cpu_read(cputime_last_delta);
65	return ct;
66}
67
68static inline cputime_t jiffies_to_cputime(const unsigned long jif)
69{
70	u64 ct;
71	unsigned long sec;
72
73	/* have to be a little careful about overflow */
74	ct = jif % HZ;
75	sec = jif / HZ;
76	if (ct) {
77		ct *= tb_ticks_per_sec;
78		do_div(ct, HZ);
79	}
80	if (sec)
81		ct += (cputime_t) sec * tb_ticks_per_sec;
82	return (__force cputime_t) ct;
83}
84
85static inline void setup_cputime_one_jiffy(void)
86{
87	cputime_one_jiffy = jiffies_to_cputime(1);
88}
89
90static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
91{
92	u64 ct;
93	u64 sec;
94
95	/* have to be a little careful about overflow */
96	ct = jif % HZ;
97	sec = jif / HZ;
98	if (ct) {
99		ct *= tb_ticks_per_sec;
100		do_div(ct, HZ);
101	}
102	if (sec)
103		ct += (u64) sec * tb_ticks_per_sec;
104	return (__force cputime64_t) ct;
105}
106
107static inline u64 cputime64_to_jiffies64(const cputime_t ct)
108{
109	return mulhdu((__force u64) ct, __cputime_jiffies_factor);
110}
111
112/*
113 * Convert cputime <-> microseconds
114 */
115extern u64 __cputime_usec_factor;
116
117static inline unsigned long cputime_to_usecs(const cputime_t ct)
118{
119	return mulhdu((__force u64) ct, __cputime_usec_factor);
120}
121
122static inline cputime_t usecs_to_cputime(const unsigned long us)
123{
124	u64 ct;
125	unsigned long sec;
126
127	/* have to be a little careful about overflow */
128	ct = us % 1000000;
129	sec = us / 1000000;
130	if (ct) {
131		ct *= tb_ticks_per_sec;
132		do_div(ct, 1000000);
133	}
134	if (sec)
135		ct += (cputime_t) sec * tb_ticks_per_sec;
136	return (__force cputime_t) ct;
137}
138
139#define usecs_to_cputime64(us)		usecs_to_cputime(us)
140
141/*
142 * Convert cputime <-> seconds
143 */
144extern u64 __cputime_sec_factor;
145
146static inline unsigned long cputime_to_secs(const cputime_t ct)
147{
148	return mulhdu((__force u64) ct, __cputime_sec_factor);
149}
150
151static inline cputime_t secs_to_cputime(const unsigned long sec)
152{
153	return (__force cputime_t)((u64) sec * tb_ticks_per_sec);
154}
155
156/*
157 * Convert cputime <-> timespec
158 */
159static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
160{
161	u64 x = (__force u64) ct;
162	unsigned int frac;
163
164	frac = do_div(x, tb_ticks_per_sec);
165	p->tv_sec = x;
166	x = (u64) frac * 1000000000;
167	do_div(x, tb_ticks_per_sec);
168	p->tv_nsec = x;
169}
170
171static inline cputime_t timespec_to_cputime(const struct timespec *p)
172{
173	u64 ct;
174
175	ct = (u64) p->tv_nsec * tb_ticks_per_sec;
176	do_div(ct, 1000000000);
177	return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
178}
179
180/*
181 * Convert cputime <-> timeval
182 */
183static inline void cputime_to_timeval(const cputime_t ct, struct timeval *p)
184{
185	u64 x = (__force u64) ct;
186	unsigned int frac;
187
188	frac = do_div(x, tb_ticks_per_sec);
189	p->tv_sec = x;
190	x = (u64) frac * 1000000;
191	do_div(x, tb_ticks_per_sec);
192	p->tv_usec = x;
193}
194
195static inline cputime_t timeval_to_cputime(const struct timeval *p)
196{
197	u64 ct;
198
199	ct = (u64) p->tv_usec * tb_ticks_per_sec;
200	do_div(ct, 1000000);
201	return (__force cputime_t)(ct + (u64) p->tv_sec * tb_ticks_per_sec);
202}
203
204/*
205 * Convert cputime <-> clock_t (units of 1/USER_HZ seconds)
206 */
207extern u64 __cputime_clockt_factor;
208
209static inline unsigned long cputime_to_clock_t(const cputime_t ct)
210{
211	return mulhdu((__force u64) ct, __cputime_clockt_factor);
212}
213
214static inline cputime_t clock_t_to_cputime(const unsigned long clk)
215{
216	u64 ct;
217	unsigned long sec;
218
219	/* have to be a little careful about overflow */
220	ct = clk % USER_HZ;
221	sec = clk / USER_HZ;
222	if (ct) {
223		ct *= tb_ticks_per_sec;
224		do_div(ct, USER_HZ);
225	}
226	if (sec)
227		ct += (u64) sec * tb_ticks_per_sec;
228	return (__force cputime_t) ct;
229}
230
231#define cputime64_to_clock_t(ct)	cputime_to_clock_t((cputime_t)(ct))
232
233static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
234
235#endif /* __KERNEL__ */
236#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
237#endif /* __POWERPC_CPUTIME_H */
238