2005-04-16 22:20:36 +00:00
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/*
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* include/asm-s390/cputime.h
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*
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* (C) Copyright IBM Corp. 2004
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*
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* Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#ifndef _S390_CPUTIME_H
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#define _S390_CPUTIME_H
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2009-06-12 08:26:21 +00:00
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#include <linux/types.h>
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#include <linux/percpu.h>
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#include <linux/spinlock.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/div64.h>
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2008-12-31 14:11:39 +00:00
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/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
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2005-04-16 22:20:36 +00:00
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typedef unsigned long long cputime_t;
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typedef unsigned long long cputime64_t;
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#ifndef __s390x__
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static inline unsigned int
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__div(unsigned long long n, unsigned int base)
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{
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register_pair rp;
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rp.pair = n >> 1;
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asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
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return rp.subreg.odd;
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}
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#else /* __s390x__ */
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static inline unsigned int
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__div(unsigned long long n, unsigned int base)
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{
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return n / base;
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}
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#endif /* __s390x__ */
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#define cputime_zero (0ULL)
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2009-07-29 10:15:29 +00:00
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#define cputime_one_jiffy jiffies_to_cputime(1)
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2005-04-16 22:20:36 +00:00
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#define cputime_max ((~0UL >> 1) - 1)
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#define cputime_add(__a, __b) ((__a) + (__b))
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#define cputime_sub(__a, __b) ((__a) - (__b))
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#define cputime_div(__a, __n) ({ \
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unsigned long long __div = (__a); \
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do_div(__div,__n); \
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__div; \
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})
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#define cputime_halve(__a) ((__a) >> 1)
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#define cputime_eq(__a, __b) ((__a) == (__b))
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#define cputime_gt(__a, __b) ((__a) > (__b))
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#define cputime_ge(__a, __b) ((__a) >= (__b))
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#define cputime_lt(__a, __b) ((__a) < (__b))
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#define cputime_le(__a, __b) ((__a) <= (__b))
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2008-12-31 14:11:39 +00:00
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#define cputime_to_jiffies(__ct) (__div((__ct), 4096000000ULL / HZ))
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2008-02-06 09:36:12 +00:00
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#define cputime_to_scaled(__ct) (__ct)
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2008-12-31 14:11:39 +00:00
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#define jiffies_to_cputime(__hz) ((cputime_t)(__hz) * (4096000000ULL / HZ))
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2005-04-16 22:20:36 +00:00
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#define cputime64_zero (0ULL)
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#define cputime64_add(__a, __b) ((__a) + (__b))
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#define cputime_to_cputime64(__ct) (__ct)
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static inline u64
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cputime64_to_jiffies64(cputime64_t cputime)
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{
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2008-12-31 14:11:39 +00:00
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do_div(cputime, 4096000000ULL / HZ);
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2005-04-16 22:20:36 +00:00
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return cputime;
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}
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/*
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* Convert cputime to milliseconds and back.
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*/
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static inline unsigned int
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cputime_to_msecs(const cputime_t cputime)
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{
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[S390] cputime: fix overflow on 31 bit systems
The cputime_to_msecs / cputime_to_clock_t and cputime64_to_clock_t
cause fixpoint divide exceptions if the cputime is too large.
On a machine that collected 49.7 days worth of idle time reading
from /proc/stat will generate oopses like this:
Kernel BUG at 001b0c92 [verbose debug info unavailable]
fixpoint divide exception: 0009 [#13] SMP
Modules linked in: ipv6
CPU: 1 Tainted: G D 2.6.27.10 #5
Process cat (pid: 21352, task: 1fb34138, ksp: 1d2a3d98)
Krnl PSW : 070c2000 801b0c92 (show_stat+0x2ca/0x68c)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0
Krnl GPRS: 00000001 00001388 00000bb8 0015d2a1
00000000 00000000 000003e8 0001fd91
00000000 00000000 0000129d eecd2ff0
1cc533b9 0036f780 801b0bce 1d2a3cc0
Krnl Code: 801b0c86: f18890abf198 mvo 171(9,%r9),408(9,%r15)
801b0c8c: 98abf170 lm %r10,%r11,368(%r15)
801b0c90: 1da1 dr %r10,%r1
>801b0c92: 90abf170 stm %r10,%r11,368(%r15)
801b0c96: 98abf190 lm %r10,%r11,400(%r15)
801b0c9a: 1da1 dr %r10,%r1
801b0c9c: 90abf190 stm %r10,%r11,400(%r15)
801b0ca0: 18a3 lr %r10,%r3
Call Trace:
([<00000000001b09f4>] show_stat+0x2c/0x68c)
[<000000000018dcee>] seq_read+0xb2/0x364
[<00000000001a9980>] proc_reg_read+0x68/0x98
[<00000000001705ee>] vfs_read+0x6e/0xe8
[<0000000000170732>] sys_read+0x36/0x78
[<000000000010f750>] sysc_do_restart+0x12/0x16
[<0000000077f3ad6a>] 0x77f3ad6a
<4>---[ end trace 1436ea9559d3de9e ]---
Reported-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-10-29 14:04:12 +00:00
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return cputime_div(cputime, 4096000);
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2005-04-16 22:20:36 +00:00
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}
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static inline cputime_t
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msecs_to_cputime(const unsigned int m)
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{
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2008-12-31 14:11:39 +00:00
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return (cputime_t) m * 4096000;
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2005-04-16 22:20:36 +00:00
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}
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/*
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* Convert cputime to milliseconds and back.
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*/
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static inline unsigned int
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cputime_to_secs(const cputime_t cputime)
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{
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2008-12-31 14:11:39 +00:00
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return __div(cputime, 2048000000) >> 1;
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2005-04-16 22:20:36 +00:00
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}
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static inline cputime_t
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secs_to_cputime(const unsigned int s)
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{
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2008-12-31 14:11:39 +00:00
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return (cputime_t) s * 4096000000ULL;
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2005-04-16 22:20:36 +00:00
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}
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/*
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* Convert cputime to timespec and back.
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*/
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static inline cputime_t
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timespec_to_cputime(const struct timespec *value)
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{
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2008-12-31 14:11:39 +00:00
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return value->tv_nsec * 4096 / 1000 + (u64) value->tv_sec * 4096000000ULL;
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2005-04-16 22:20:36 +00:00
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}
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static inline void
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cputime_to_timespec(const cputime_t cputime, struct timespec *value)
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{
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#ifndef __s390x__
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register_pair rp;
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rp.pair = cputime >> 1;
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2008-12-31 14:11:39 +00:00
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asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
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value->tv_nsec = rp.subreg.even * 1000 / 4096;
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2005-04-16 22:20:36 +00:00
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value->tv_sec = rp.subreg.odd;
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#else
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2008-12-31 14:11:39 +00:00
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value->tv_nsec = (cputime % 4096000000ULL) * 1000 / 4096;
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value->tv_sec = cputime / 4096000000ULL;
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2005-04-16 22:20:36 +00:00
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#endif
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}
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/*
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* Convert cputime to timeval and back.
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* Since cputime and timeval have the same resolution (microseconds)
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* this is easy.
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*/
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static inline cputime_t
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timeval_to_cputime(const struct timeval *value)
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{
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2008-12-31 14:11:39 +00:00
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return value->tv_usec * 4096 + (u64) value->tv_sec * 4096000000ULL;
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2005-04-16 22:20:36 +00:00
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}
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static inline void
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cputime_to_timeval(const cputime_t cputime, struct timeval *value)
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{
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#ifndef __s390x__
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register_pair rp;
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rp.pair = cputime >> 1;
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2008-12-31 14:11:39 +00:00
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asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
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value->tv_usec = rp.subreg.even / 4096;
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2005-04-16 22:20:36 +00:00
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value->tv_sec = rp.subreg.odd;
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#else
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2009-02-19 14:19:00 +00:00
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value->tv_usec = (cputime % 4096000000ULL) / 4096;
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2008-12-31 14:11:39 +00:00
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value->tv_sec = cputime / 4096000000ULL;
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2005-04-16 22:20:36 +00:00
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#endif
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}
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/*
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* Convert cputime to clock and back.
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*/
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static inline clock_t
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cputime_to_clock_t(cputime_t cputime)
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{
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[S390] cputime: fix overflow on 31 bit systems
The cputime_to_msecs / cputime_to_clock_t and cputime64_to_clock_t
cause fixpoint divide exceptions if the cputime is too large.
On a machine that collected 49.7 days worth of idle time reading
from /proc/stat will generate oopses like this:
Kernel BUG at 001b0c92 [verbose debug info unavailable]
fixpoint divide exception: 0009 [#13] SMP
Modules linked in: ipv6
CPU: 1 Tainted: G D 2.6.27.10 #5
Process cat (pid: 21352, task: 1fb34138, ksp: 1d2a3d98)
Krnl PSW : 070c2000 801b0c92 (show_stat+0x2ca/0x68c)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0
Krnl GPRS: 00000001 00001388 00000bb8 0015d2a1
00000000 00000000 000003e8 0001fd91
00000000 00000000 0000129d eecd2ff0
1cc533b9 0036f780 801b0bce 1d2a3cc0
Krnl Code: 801b0c86: f18890abf198 mvo 171(9,%r9),408(9,%r15)
801b0c8c: 98abf170 lm %r10,%r11,368(%r15)
801b0c90: 1da1 dr %r10,%r1
>801b0c92: 90abf170 stm %r10,%r11,368(%r15)
801b0c96: 98abf190 lm %r10,%r11,400(%r15)
801b0c9a: 1da1 dr %r10,%r1
801b0c9c: 90abf190 stm %r10,%r11,400(%r15)
801b0ca0: 18a3 lr %r10,%r3
Call Trace:
([<00000000001b09f4>] show_stat+0x2c/0x68c)
[<000000000018dcee>] seq_read+0xb2/0x364
[<00000000001a9980>] proc_reg_read+0x68/0x98
[<00000000001705ee>] vfs_read+0x6e/0xe8
[<0000000000170732>] sys_read+0x36/0x78
[<000000000010f750>] sysc_do_restart+0x12/0x16
[<0000000077f3ad6a>] 0x77f3ad6a
<4>---[ end trace 1436ea9559d3de9e ]---
Reported-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-10-29 14:04:12 +00:00
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return cputime_div(cputime, 4096000000ULL / USER_HZ);
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2005-04-16 22:20:36 +00:00
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}
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static inline cputime_t
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clock_t_to_cputime(unsigned long x)
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{
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2008-12-31 14:11:39 +00:00
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return (cputime_t) x * (4096000000ULL / USER_HZ);
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2005-04-16 22:20:36 +00:00
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}
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/*
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* Convert cputime64 to clock.
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*/
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static inline clock_t
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cputime64_to_clock_t(cputime64_t cputime)
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{
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[S390] cputime: fix overflow on 31 bit systems
The cputime_to_msecs / cputime_to_clock_t and cputime64_to_clock_t
cause fixpoint divide exceptions if the cputime is too large.
On a machine that collected 49.7 days worth of idle time reading
from /proc/stat will generate oopses like this:
Kernel BUG at 001b0c92 [verbose debug info unavailable]
fixpoint divide exception: 0009 [#13] SMP
Modules linked in: ipv6
CPU: 1 Tainted: G D 2.6.27.10 #5
Process cat (pid: 21352, task: 1fb34138, ksp: 1d2a3d98)
Krnl PSW : 070c2000 801b0c92 (show_stat+0x2ca/0x68c)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0
Krnl GPRS: 00000001 00001388 00000bb8 0015d2a1
00000000 00000000 000003e8 0001fd91
00000000 00000000 0000129d eecd2ff0
1cc533b9 0036f780 801b0bce 1d2a3cc0
Krnl Code: 801b0c86: f18890abf198 mvo 171(9,%r9),408(9,%r15)
801b0c8c: 98abf170 lm %r10,%r11,368(%r15)
801b0c90: 1da1 dr %r10,%r1
>801b0c92: 90abf170 stm %r10,%r11,368(%r15)
801b0c96: 98abf190 lm %r10,%r11,400(%r15)
801b0c9a: 1da1 dr %r10,%r1
801b0c9c: 90abf190 stm %r10,%r11,400(%r15)
801b0ca0: 18a3 lr %r10,%r3
Call Trace:
([<00000000001b09f4>] show_stat+0x2c/0x68c)
[<000000000018dcee>] seq_read+0xb2/0x364
[<00000000001a9980>] proc_reg_read+0x68/0x98
[<00000000001705ee>] vfs_read+0x6e/0xe8
[<0000000000170732>] sys_read+0x36/0x78
[<000000000010f750>] sysc_do_restart+0x12/0x16
[<0000000077f3ad6a>] 0x77f3ad6a
<4>---[ end trace 1436ea9559d3de9e ]---
Reported-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-10-29 14:04:12 +00:00
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return cputime_div(cputime, 4096000000ULL / USER_HZ);
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2005-04-16 22:20:36 +00:00
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}
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2009-06-12 08:26:21 +00:00
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struct s390_idle_data {
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2009-06-22 10:08:20 +00:00
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unsigned int sequence;
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2009-06-12 08:26:21 +00:00
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unsigned long long idle_count;
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unsigned long long idle_enter;
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unsigned long long idle_time;
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2009-09-29 12:25:16 +00:00
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int nohz_delay;
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2009-06-12 08:26:21 +00:00
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};
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DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
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2010-05-17 08:00:03 +00:00
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void vtime_start_cpu(__u64 int_clock, __u64 enter_timer);
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2009-04-23 11:58:08 +00:00
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cputime64_t s390_get_idle_time(int cpu);
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#define arch_idle_time(cpu) s390_get_idle_time(cpu)
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2010-05-17 08:00:03 +00:00
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static inline void s390_idle_check(struct pt_regs *regs, __u64 int_clock,
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__u64 enter_timer)
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2009-06-12 08:26:21 +00:00
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{
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2010-05-17 08:00:03 +00:00
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if (regs->psw.mask & PSW_MASK_WAIT)
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vtime_start_cpu(int_clock, enter_timer);
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2009-06-12 08:26:21 +00:00
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}
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2009-09-29 12:25:16 +00:00
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static inline int s390_nohz_delay(int cpu)
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{
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return per_cpu(s390_idle, cpu).nohz_delay != 0;
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}
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#define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
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2005-04-16 22:20:36 +00:00
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#endif /* _S390_CPUTIME_H */
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