diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/smp.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/smp.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c index 4aff754b6f2c..40dae96f7e20 100644 --- a/arch/powerpc/platforms/powernv/smp.c +++ b/arch/powerpc/platforms/powernv/smp.c @@ -63,7 +63,8 @@ static int pnv_smp_kick_cpu(int nr) long rc; uint8_t status; - BUG_ON(nr < 0 || nr >= NR_CPUS); + if (nr < 0 || nr >= nr_cpu_ids) + return -EINVAL; /* * If we already started or OPAL is not supported, we just @@ -144,7 +145,14 @@ static void pnv_smp_cpu_kill_self(void) unsigned long srr1, wmask; /* Standard hot unplug procedure */ - local_irq_disable(); + /* + * This hard disables local interurpts, ensuring we have no lazy + * irqs pending. + */ + WARN_ON(irqs_disabled()); + hard_irq_disable(); + WARN_ON(lazy_irq_pending()); + idle_task_exit(); current->active_mm = NULL; /* for sanity */ cpu = smp_processor_id(); @@ -162,16 +170,6 @@ static void pnv_smp_cpu_kill_self(void) */ mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) & ~(u64)LPCR_PECE1); - /* - * Hard-disable interrupts, and then clear irq_happened flags - * that we can safely ignore while off-line, since they - * are for things for which we do no processing when off-line - * (or in the case of HMI, all the processing we need to do - * is done in lower-level real-mode code). - */ - hard_irq_disable(); - local_paca->irq_happened &= ~(PACA_IRQ_DEC | PACA_IRQ_HMI); - while (!generic_check_cpu_restart(cpu)) { /* * Clear IPI flag, since we don't handle IPIs while @@ -182,9 +180,9 @@ static void pnv_smp_cpu_kill_self(void) */ kvmppc_set_host_ipi(cpu, 0); - ppc64_runlatch_off(); srr1 = pnv_cpu_offline(cpu); - ppc64_runlatch_on(); + + WARN_ON(lazy_irq_pending()); /* * If the SRR1 value indicates that we woke up due to @@ -198,8 +196,7 @@ static void pnv_smp_cpu_kill_self(void) * contains 0. */ if (((srr1 & wmask) == SRR1_WAKEEE) || - ((srr1 & wmask) == SRR1_WAKEHVI) || - (local_paca->irq_happened & PACA_IRQ_EE)) { + ((srr1 & wmask) == SRR1_WAKEHVI)) { if (cpu_has_feature(CPU_FTR_ARCH_300)) { if (xive_enabled()) xive_flush_interrupt(); @@ -211,14 +208,15 @@ static void pnv_smp_cpu_kill_self(void) unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); asm volatile(PPC_MSGCLR(%0) : : "r" (msg)); } - local_paca->irq_happened &= ~(PACA_IRQ_EE | PACA_IRQ_DBELL); smp_mb(); if (cpu_core_split_required()) continue; if (srr1 && !generic_check_cpu_restart(cpu)) - DBG("CPU%d Unexpected exit while offline !\n", cpu); + DBG("CPU%d Unexpected exit while offline srr1=%lx!\n", + cpu, srr1); + } /* Re-enable decrementer interrupts */ |