diff options
| -rw-r--r-- | arch/s390/include/asm/smp.h | 5 | ||||
| -rw-r--r-- | arch/s390/kernel/ipl.c | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/smp.c | 23 |
3 files changed, 29 insertions, 0 deletions
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index 045e009fc16..ab47a69fdf0 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -33,6 +33,7 @@ extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1]; extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *); extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp, int from, int to); +extern void smp_restart_with_online_cpu(void); extern void smp_restart_cpu(void); /* @@ -64,6 +65,10 @@ static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) func(data); } +static inline void smp_restart_with_online_cpu(void) +{ +} + #define smp_vcpu_scheduled (1) #endif /* CONFIG_SMP */ diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index 48c71020636..90769b4bc7f 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -1738,6 +1738,7 @@ static struct kobj_attribute on_restart_attr = void do_restart(void) { + smp_restart_with_online_cpu(); smp_send_stop(); on_restart_trigger.action->fn(&on_restart_trigger); stop_run(&on_restart_trigger); diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 6ab16ac64d2..e4572601e91 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -97,6 +97,29 @@ static inline int cpu_stopped(int cpu) return raw_cpu_stopped(cpu_logical_map(cpu)); } +/* + * Ensure that PSW restart is done on an online CPU + */ +void smp_restart_with_online_cpu(void) +{ + int cpu; + + for_each_online_cpu(cpu) { + if (stap() == __cpu_logical_map[cpu]) { + /* We are online: Enable DAT again and return */ + __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); + return; + } + } + /* We are not online: Do PSW restart on an online CPU */ + while (sigp(cpu, sigp_restart) == sigp_busy) + cpu_relax(); + /* And stop ourself */ + while (raw_sigp(stap(), sigp_stop) == sigp_busy) + cpu_relax(); + for (;;); +} + void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) { struct _lowcore *lc, *current_lc; |