From 217d453d473c5ddfd140a06bf9d8575218551020 Mon Sep 17 00:00:00 2001 From: Yang Yingliang Date: Thu, 24 Sep 2015 17:32:14 +0800 Subject: [PATCH] arm64: fix a migrating irq bug when hotplug cpu When cpu is disabled, all irqs will be migratged to another cpu. In some cases, a new affinity is different, the old affinity need to be updated and if irq_set_affinity's return value is IRQ_SET_MASK_OK_DONE, the old affinity can not be updated. Fix it by using irq_do_set_affinity. And migrating interrupts is a core code matter, so use the generic function irq_migrate_all_off_this_cpu() to migrate interrupts in kernel/irq/migration.c. Cc: Jiang Liu Cc: Thomas Gleixner Cc: Mark Rutland Cc: Will Deacon Cc: Russell King - ARM Linux Cc: Hanjun Guo Acked-by: Marc Zyngier Signed-off-by: Yang Yingliang Signed-off-by: Catalin Marinas --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/irq.h | 1 - arch/arm64/kernel/irq.c | 62 ------------------------------------ arch/arm64/kernel/smp.c | 3 +- 4 files changed, 3 insertions(+), 64 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 98b4f98a13de..1b35bdbd5d74 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -427,6 +427,7 @@ config NR_CPUS config HOTPLUG_CPU bool "Support for hot-pluggable CPUs" + select GENERIC_IRQ_MIGRATION help Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h index bbb251b14746..09169296c3cc 100644 --- a/arch/arm64/include/asm/irq.h +++ b/arch/arm64/include/asm/irq.h @@ -7,7 +7,6 @@ struct pt_regs; -extern void migrate_irqs(void); extern void set_handle_irq(void (*handle_irq)(struct pt_regs *)); static inline void acpi_irq_init(void) diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c index 11dc3fd47853..9f17ec071ee0 100644 --- a/arch/arm64/kernel/irq.c +++ b/arch/arm64/kernel/irq.c @@ -27,7 +27,6 @@ #include #include #include -#include unsigned long irq_err_count; @@ -54,64 +53,3 @@ void __init init_IRQ(void) if (!handle_arch_irq) panic("No interrupt controller found."); } - -#ifdef CONFIG_HOTPLUG_CPU -static bool migrate_one_irq(struct irq_desc *desc) -{ - struct irq_data *d = irq_desc_get_irq_data(desc); - const struct cpumask *affinity = irq_data_get_affinity_mask(d); - struct irq_chip *c; - bool ret = false; - - /* - * If this is a per-CPU interrupt, or the affinity does not - * include this CPU, then we have nothing to do. - */ - if (irqd_is_per_cpu(d) || !cpumask_test_cpu(smp_processor_id(), affinity)) - return false; - - if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) { - affinity = cpu_online_mask; - ret = true; - } - - c = irq_data_get_irq_chip(d); - if (!c->irq_set_affinity) - pr_debug("IRQ%u: unable to set affinity\n", d->irq); - else if (c->irq_set_affinity(d, affinity, false) == IRQ_SET_MASK_OK && ret) - cpumask_copy(irq_data_get_affinity_mask(d), affinity); - - return ret; -} - -/* - * The current CPU has been marked offline. Migrate IRQs off this CPU. - * If the affinity settings do not allow other CPUs, force them onto any - * available CPU. - * - * Note: we must iterate over all IRQs, whether they have an attached - * action structure or not, as we need to get chained interrupts too. - */ -void migrate_irqs(void) -{ - unsigned int i; - struct irq_desc *desc; - unsigned long flags; - - local_irq_save(flags); - - for_each_irq_desc(i, desc) { - bool affinity_broken; - - raw_spin_lock(&desc->lock); - affinity_broken = migrate_one_irq(desc); - raw_spin_unlock(&desc->lock); - - if (affinity_broken) - pr_warn_ratelimited("IRQ%u no longer affine to CPU%u\n", - i, smp_processor_id()); - } - - local_irq_restore(flags); -} -#endif /* CONFIG_HOTPLUG_CPU */ diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 03b0aa28ea61..b7a973d6861e 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -231,7 +231,8 @@ int __cpu_disable(void) /* * OK - migrate IRQs away from this CPU */ - migrate_irqs(); + irq_migrate_all_off_this_cpu(); + return 0; } -- 2.20.1