diff options
| -rw-r--r-- | arch/ia64/kernel/mca.c | 47 |
1 files changed, 25 insertions, 22 deletions
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c index 92367faecbbf..cc87025e8f54 100644 --- a/arch/ia64/kernel/mca.c +++ b/arch/ia64/kernel/mca.c @@ -701,8 +701,7 @@ ia64_mca_cmc_vector_enable_keventd(struct work_struct *unused) /* * ia64_mca_wakeup * - * Send an inter-cpu interrupt to wake-up a particular cpu - * and mark that cpu to be out of rendez. + * Send an inter-cpu interrupt to wake-up a particular cpu. * * Inputs : cpuid * Outputs : None @@ -711,14 +710,12 @@ static void ia64_mca_wakeup(int cpu) { platform_send_ipi(cpu, IA64_MCA_WAKEUP_VECTOR, IA64_IPI_DM_INT, 0); - ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE; - } /* * ia64_mca_wakeup_all * - * Wakeup all the cpus which have rendez'ed previously. + * Wakeup all the slave cpus which have rendez'ed previously. * * Inputs : None * Outputs : None @@ -741,7 +738,10 @@ ia64_mca_wakeup_all(void) * * This is handler used to put slave processors into spinloop * while the monarch processor does the mca handling and later - * wake each slave up once the monarch is done. + * wake each slave up once the monarch is done. The state + * IA64_MCA_RENDEZ_CHECKIN_DONE indicates the cpu is rendez'ed + * in SAL. The state IA64_MCA_RENDEZ_CHECKIN_NOTDONE indicates + * the cpu has come out of OS rendezvous. * * Inputs : None * Outputs : None @@ -778,6 +778,7 @@ ia64_mca_rendez_int_handler(int rendez_irq, void *arg) (long)&nd, 0, 0) == NOTIFY_STOP) ia64_mca_spin(__FUNCTION__); + ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE; /* Enable all interrupts */ local_irq_restore(flags); return IRQ_HANDLED; @@ -1221,26 +1222,27 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw, if (notify_die(DIE_MCA_MONARCH_ENTER, "MCA", regs, (long)&nd, 0, 0) == NOTIFY_STOP) ia64_mca_spin(__FUNCTION__); + + ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA; if (sos->monarch) { ia64_wait_for_slaves(cpu, "MCA"); + + /* Wakeup all the processors which are spinning in the + * rendezvous loop. They will leave SAL, then spin in the OS + * with interrupts disabled until this monarch cpu leaves the + * MCA handler. That gets control back to the OS so we can + * backtrace the other cpus, backtrace when spinning in SAL + * does not work. + */ + ia64_mca_wakeup_all(); + if (notify_die(DIE_MCA_MONARCH_PROCESS, "MCA", regs, (long)&nd, 0, 0) + == NOTIFY_STOP) + ia64_mca_spin(__FUNCTION__); } else { - ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA; while (cpu_isset(cpu, mca_cpu)) cpu_relax(); /* spin until monarch wakes us */ - ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE; } - /* Wakeup all the processors which are spinning in the rendezvous loop. - * They will leave SAL, then spin in the OS with interrupts disabled - * until this monarch cpu leaves the MCA handler. That gets control - * back to the OS so we can backtrace the other cpus, backtrace when - * spinning in SAL does not work. - */ - ia64_mca_wakeup_all(); - if (notify_die(DIE_MCA_MONARCH_PROCESS, "MCA", regs, (long)&nd, 0, 0) - == NOTIFY_STOP) - ia64_mca_spin(__FUNCTION__); - /* Get the MCA error record and log it */ ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA); @@ -1274,21 +1276,22 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw, /* wake up the next monarch cpu, * and put this cpu in the rendez loop. */ - ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA; for_each_online_cpu(i) { if (cpu_isset(i, mca_cpu)) { monarch_cpu = i; cpu_clear(i, mca_cpu); /* wake next cpu */ while (monarch_cpu != -1) cpu_relax(); /* spin until last cpu leaves */ - ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE; set_curr_task(cpu, previous_current); + ia64_mc_info.imi_rendez_checkin[cpu] + = IA64_MCA_RENDEZ_CHECKIN_NOTDONE; return; } } } set_curr_task(cpu, previous_current); - monarch_cpu = -1; + ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE; + monarch_cpu = -1; /* This frees the slaves and previous monarchs */ } static DECLARE_WORK(cmc_disable_work, ia64_mca_cmc_vector_disable_keventd); |