diff options
Diffstat (limited to 'arch/s390/kernel/smp.c')
| -rw-r--r-- | arch/s390/kernel/smp.c | 117 |
1 files changed, 34 insertions, 83 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 62822245f9b..19090f7d4f5 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -230,18 +230,37 @@ static inline void do_store_status(void) } } +static inline void do_wait_for_stop(void) +{ + int cpu; + + /* 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(); + } +} + /* * this function sends a 'stop' sigp to all other CPUs in the system. * it goes straight through. */ void smp_send_stop(void) { + /* Disable all interrupts/machine checks */ + __load_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK); + /* write magic number to zero page (absolute 0) */ lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC; /* stop other processors. */ do_send_stop(); + /* wait until other processors are stopped */ + do_wait_for_stop(); + /* store status of other processors. */ do_store_status(); } @@ -250,88 +269,28 @@ void smp_send_stop(void) * Reboot, halt and power_off routines for SMP. */ -static void do_machine_restart(void * __unused) -{ - int cpu; - static atomic_t cpuid = ATOMIC_INIT(-1); - - 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(); - } - - /* Store status of other cpus. */ - do_store_status(); - - /* - * Finally call reipl. Because we waited for all other - * cpus to enter this function we know that they do - * not hold any s390irq-locks (the cpus have been - * interrupted by an external interrupt and s390irq - * locks are always held disabled). - */ - do_reipl(); -} - void machine_restart_smp(char * __unused) { - on_each_cpu(do_machine_restart, NULL, 0, 0); -} - -static void do_wait_for_stop(void) -{ - unsigned long cr[16]; - - __ctl_store(cr, 0, 15); - cr[0] &= ~0xffff; - cr[6] = 0; - __ctl_load(cr, 0, 15); - for (;;) - enabled_wait(); -} - -static void do_machine_halt(void * __unused) -{ - static atomic_t cpuid = ATOMIC_INIT(-1); - - if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) { - smp_send_stop(); - if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) - cpcmd(vmhalt_cmd, NULL, 0, NULL); - signal_processor(smp_processor_id(), - sigp_stop_and_store_status); - } - do_wait_for_stop(); + smp_send_stop(); + do_reipl(); } void machine_halt_smp(void) { - on_each_cpu(do_machine_halt, NULL, 0, 0); -} - -static void do_machine_power_off(void * __unused) -{ - static atomic_t cpuid = ATOMIC_INIT(-1); - - if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) { - smp_send_stop(); - if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) - cpcmd(vmpoff_cmd, NULL, 0, NULL); - signal_processor(smp_processor_id(), - sigp_stop_and_store_status); - } - do_wait_for_stop(); + smp_send_stop(); + if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) + __cpcmd(vmhalt_cmd, NULL, 0, NULL); + signal_processor(smp_processor_id(), sigp_stop_and_store_status); + for (;;); } void machine_power_off_smp(void) { - on_each_cpu(do_machine_power_off, NULL, 0, 0); + smp_send_stop(); + if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) + __cpcmd(vmpoff_cmd, NULL, 0, NULL); + signal_processor(smp_processor_id(), sigp_stop_and_store_status); + for (;;); } /* @@ -501,8 +460,6 @@ __init smp_count_cpus(void) */ extern void init_cpu_timer(void); extern void init_cpu_vtimer(void); -extern int pfault_init(void); -extern void pfault_fini(void); int __devinit start_secondary(void *cpuvoid) { @@ -514,11 +471,9 @@ int __devinit start_secondary(void *cpuvoid) #ifdef CONFIG_VIRT_TIMER init_cpu_vtimer(); #endif -#ifdef CONFIG_PFAULT /* Enable pfault pseudo page faults on this cpu. */ - if (MACHINE_IS_VM) - pfault_init(); -#endif + pfault_init(); + /* Mark this cpu as online */ cpu_set(smp_processor_id(), cpu_online_map); /* Switch on interrupts */ @@ -708,11 +663,8 @@ __cpu_disable(void) } cpu_clear(cpu, cpu_online_map); -#ifdef CONFIG_PFAULT /* Disable pfault pseudo page faults on this cpu. */ - if (MACHINE_IS_VM) - pfault_fini(); -#endif + pfault_fini(); memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); @@ -860,4 +812,3 @@ EXPORT_SYMBOL(smp_ctl_clear_bit); EXPORT_SYMBOL(smp_call_function); EXPORT_SYMBOL(smp_get_cpu); EXPORT_SYMBOL(smp_put_cpu); - |