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author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2006-12-04 15:40:33 +0100 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2006-12-04 15:40:33 +0100 |
commit | c6b5b847a7cf11f131c43fe0041443ec11697fc7 (patch) | |
tree | d15fb7302bd446394ab373128be0a77826566e30 /drivers/s390/char/sclp_quiesce.c | |
parent | 740b5706b9c4b3767f597b3ea76654c6f2a800b2 (diff) | |
download | linux-stable-c6b5b847a7cf11f131c43fe0041443ec11697fc7.tar.gz linux-stable-c6b5b847a7cf11f131c43fe0041443ec11697fc7.tar.bz2 linux-stable-c6b5b847a7cf11f131c43fe0041443ec11697fc7.zip |
[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/sclp_quiesce.c')
-rw-r--r-- | drivers/s390/char/sclp_quiesce.c | 37 |
1 files changed, 1 insertions, 36 deletions
diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c index 32004aae95c1..ffa9282ce97a 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 |