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[S390] rework idle code

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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>
This commit is contained in:
Martin Schwidefsky
2012-03-11 11:59:27 -04:00
parent 8b646bd759
commit 4c1051e37a
13 changed files with 214 additions and 214 deletions
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8
arch/s390/kernel/asm-offsets.c
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@@ -8,6 +8,8 @@
#include <linux/kbuild.h>
#include <linux/sched.h>
#include <asm/cputime.h>
#include <asm/timer.h>
#include <asm/vdso.h>
#include <asm/pgtable.h>
#include <asm/system.h>
@@ -70,6 +72,12 @@ int main(void)
DEFINE(__CLOCK_MONOTONIC, CLOCK_MONOTONIC);
DEFINE(__CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC);
BLANK();
/* idle data offsets */
DEFINE(__IDLE_ENTER, offsetof(struct s390_idle_data, idle_enter));
DEFINE(__IDLE_EXIT, offsetof(struct s390_idle_data, idle_exit));
/* vtimer queue offsets */
DEFINE(__VQ_IDLE_ENTER, offsetof(struct vtimer_queue, idle_enter));
DEFINE(__VQ_IDLE_EXIT, offsetof(struct vtimer_queue, idle_exit));
/* lowcore offsets */
DEFINE(__LC_EXT_PARAMS, offsetof(struct _lowcore, ext_params));
DEFINE(__LC_EXT_CPU_ADDR, offsetof(struct _lowcore, ext_cpu_addr));