linux/arch/s390/include/asm/timer.h
Martin Schwidefsky 4c1051e37a [S390] rework idle code
Whenever the cpu loads an enabled wait PSW it will appear as idle to the
underlying host system. The code in default_idle calls vtime_stop_cpu
which does the necessary voodoo to get the cpu time accounting right.
The udelay code just loads an enabled wait PSW. To correct this rework
the vtime_stop_cpu/vtime_start_cpu logic and move the difficult parts
to entry[64].S, vtime_stop_cpu can now be called from anywhere and
vtime_start_cpu is gone. The correction of the cpu time during wakeup
from an enabled wait PSW is done with a critical section in entry[64].S.
As vtime_start_cpu is gone, s390_idle_check can be removed as well.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-03-11 11:59:28 -04:00

56 lines
1.3 KiB
C

/*
* include/asm-s390/timer.h
*
* (C) Copyright IBM Corp. 2003,2006
* Virtual CPU timer
*
* Author: Jan Glauber (jang@de.ibm.com)
*/
#ifndef _ASM_S390_TIMER_H
#define _ASM_S390_TIMER_H
#ifdef __KERNEL__
#include <linux/timer.h>
#define VTIMER_MAX_SLICE (0x7ffffffffffff000LL)
struct vtimer_list {
struct list_head entry;
int cpu;
__u64 expires;
__u64 interval;
void (*function)(unsigned long);
unsigned long data;
};
/* the vtimer value will wrap after ca. 71 years */
struct vtimer_queue {
struct list_head list;
spinlock_t lock;
__u64 timer; /* last programmed timer */
__u64 elapsed; /* elapsed time of timer expire values */
__u64 idle_enter; /* cpu timer on idle enter */
__u64 idle_exit; /* cpu timer on idle exit */
};
extern void init_virt_timer(struct vtimer_list *timer);
extern void add_virt_timer(void *new);
extern void add_virt_timer_periodic(void *new);
extern int mod_virt_timer(struct vtimer_list *timer, __u64 expires);
extern int mod_virt_timer_periodic(struct vtimer_list *timer, __u64 expires);
extern int del_virt_timer(struct vtimer_list *timer);
extern void init_cpu_vtimer(void);
extern void vtime_init(void);
extern void vtime_stop_cpu(void);
extern void vtime_start_leave(void);
#endif /* __KERNEL__ */
#endif /* _ASM_S390_TIMER_H */