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authorHeiko Carstens <heiko.carstens@de.ibm.com>2006-12-04 15:40:33 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-12-04 15:40:33 +0100
commitc6b5b847a7cf11f131c43fe0041443ec11697fc7 (patch)
treed15fb7302bd446394ab373128be0a77826566e30 /drivers/s390/char
parent740b5706b9c4b3767f597b3ea76654c6f2a800b2 (diff)
[S390] cpu shutdown rework
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>
Diffstat (limited to 'drivers/s390/char')
-rw-r--r--drivers/s390/char/sclp_quiesce.c37
1 files changed, 1 insertions, 36 deletions
diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c
index 32004aae95c..ffa9282ce97 100644
--- a/drivers/s390/char/sclp_quiesce.c
+++ b/drivers/s390/char/sclp_quiesce.c
@@ -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