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[S390] cpu shutdown rework

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Let one master cpu kill all other cpus instead of sending an external
interrupt to all other cpus so they can kill themselves.
Simplifies reipl/shutdown functions a lot.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2006-12-04 15:40:33 +01:00
committed by Martin Schwidefsky
parent 740b5706b9
commit c6b5b847a7
5 changed files with 58 additions and 180 deletions
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37
drivers/s390/char/sclp_quiesce.c
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@@ -19,52 +19,17 @@
#include "sclp.h"
#ifdef CONFIG_SMP
/* Signal completion of shutdown process. All CPUs except the first to enter
* this function: go to stopped state. First CPU: wait until all other
* CPUs are in stopped or check stop state. Afterwards, load special PSW
* to indicate completion. */
static void
do_load_quiesce_psw(void * __unused)
{
static atomic_t cpuid = ATOMIC_INIT(-1);
psw_t quiesce_psw;
int cpu;
if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
signal_processor(smp_processor_id(), sigp_stop);
/* Wait for all other cpus to enter stopped state */
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
while(!smp_cpu_not_running(cpu))
cpu_relax();
}
/* Quiesce the last cpu with the special psw */
quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
quiesce_psw.addr = 0xfff;
__load_psw(quiesce_psw);
}
/* Shutdown handler. Perform shutdown function on all CPUs. */
static void
do_machine_quiesce(void)
{
on_each_cpu(do_load_quiesce_psw, NULL, 0, 0);
}
#else
/* Shutdown handler. Signal completion of shutdown by loading special PSW. */
static void
do_machine_quiesce(void)
{
psw_t quiesce_psw;
smp_send_stop();
quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
quiesce_psw.addr = 0xfff;
__load_psw(quiesce_psw);
}
#endif
/* Handler for quiesce event. Start shutdown procedure. */
static void