4c1051e37a
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>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/*
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* include/asm-s390/timer.h
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*
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* (C) Copyright IBM Corp. 2003,2006
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* Virtual CPU timer
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*
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* Author: Jan Glauber (jang@de.ibm.com)
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*/
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#ifndef _ASM_S390_TIMER_H
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#define _ASM_S390_TIMER_H
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#ifdef __KERNEL__
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#include <linux/timer.h>
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#define VTIMER_MAX_SLICE (0x7ffffffffffff000LL)
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struct vtimer_list {
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struct list_head entry;
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int cpu;
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__u64 expires;
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__u64 interval;
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void (*function)(unsigned long);
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unsigned long data;
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};
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/* the vtimer value will wrap after ca. 71 years */
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struct vtimer_queue {
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struct list_head list;
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spinlock_t lock;
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__u64 timer; /* last programmed timer */
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__u64 elapsed; /* elapsed time of timer expire values */
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__u64 idle_enter; /* cpu timer on idle enter */
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__u64 idle_exit; /* cpu timer on idle exit */
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};
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extern void init_virt_timer(struct vtimer_list *timer);
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extern void add_virt_timer(void *new);
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extern void add_virt_timer_periodic(void *new);
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extern int mod_virt_timer(struct vtimer_list *timer, __u64 expires);
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extern int mod_virt_timer_periodic(struct vtimer_list *timer, __u64 expires);
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extern int del_virt_timer(struct vtimer_list *timer);
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extern void init_cpu_vtimer(void);
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extern void vtime_init(void);
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extern void vtime_stop_cpu(void);
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extern void vtime_start_leave(void);
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#endif /* __KERNEL__ */
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#endif /* _ASM_S390_TIMER_H */
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