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Message-ID: <1442467166-1460-5-git-send-email-yangyingliang@huawei.com>
Date: Thu, 17 Sep 2015 13:19:26 +0800
From: Yang Yingliang <yangyingliang@...wei.com>
To: <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: Yang Yingliang <yangyingliang@...wei.com>,
Jiang Liu <jiang.liu@...ux.intel.com>,
Thomas Gleixner <tglx@...utronix.de>,
"Marc Zyngier" <marc.zyngier@....com>,
Mark Rutland <mark.rutland@....com>,
"Will Deacon" <will.deacon@....com>,
Russell King - ARM Linux <linux@....linux.org.uk>,
Hanjun Guo <hanjun.guo@...aro.org>
Subject: [RFC PATCH v4 4/4] arm: 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, it needed to be coppied
to irq's affinity. But if the type of irq is LPI, it's affinity will
not be coppied because of irq_set_affinity's return value. Fix it by
using irq_do_set_affinity.
And migrating interrupts is a core code matter, so use the generic
function move_irqs() to migrate interrupts in kernel/irq/migration.c.
Cc: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Russell King - ARM Linux <linux@....linux.org.uk>
Cc: Hanjun Guo <hanjun.guo@...aro.org>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
arch/arm/Kconfig | 1 +
arch/arm/include/asm/irq.h | 1 -
arch/arm/kernel/irq.c | 62 ----------------------------------------------
arch/arm/kernel/smp.c | 2 +-
4 files changed, 2 insertions(+), 64 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 72ad724..bffba78 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1492,6 +1492,7 @@ config NR_CPUS
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
depends on SMP
+ 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/arm/include/asm/irq.h b/arch/arm/include/asm/irq.h
index be1d07d..882bf98 100644
--- a/arch/arm/include/asm/irq.h
+++ b/arch/arm/include/asm/irq.h
@@ -24,7 +24,6 @@
#ifndef __ASSEMBLY__
struct irqaction;
struct pt_regs;
-extern void migrate_irqs(void);
extern void asm_do_IRQ(unsigned int, struct pt_regs *);
void handle_IRQ(unsigned int, struct pt_regs *);
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 5ff4826..78abea8 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -31,7 +31,6 @@
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/seq_file.h>
-#include <linux/ratelimit.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/kallsyms.h>
@@ -136,64 +135,3 @@ int __init arch_probe_nr_irqs(void)
return nr_irqs;
}
#endif
-
-#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/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 48185a7..262ead7 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -218,7 +218,7 @@ int __cpu_disable(void)
/*
* OK - migrate IRQs away from this CPU
*/
- migrate_irqs();
+ move_irqs();
/*
* Flush user cache and TLB mappings, and then remove this CPU
--
2.5.0
--
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