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Diffstat (limited to 'arch/sh/kernel/irq.c')
-rw-r--r--arch/sh/kernel/irq.c91
1 files changed, 71 insertions, 20 deletions
diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index d2d41d046657..257de1f0692b 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -12,6 +12,7 @@
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/ftrace.h>
+#include <linux/delay.h>
#include <asm/processor.h>
#include <asm/machvec.h>
#include <asm/uaccess.h>
@@ -113,19 +114,14 @@ union irq_ctx {
static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly;
static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
-#endif
-asmlinkage __irq_entry int do_IRQ(unsigned int irq, struct pt_regs *regs)
+static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
+static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
+
+static inline void handle_one_irq(unsigned int irq)
{
- struct pt_regs *old_regs = set_irq_regs(regs);
-#ifdef CONFIG_IRQSTACKS
union irq_ctx *curctx, *irqctx;
-#endif
-
- irq_enter();
- irq = irq_demux(irq);
-#ifdef CONFIG_IRQSTACKS
curctx = (union irq_ctx *)current_thread_info();
irqctx = hardirq_ctx[smp_processor_id()];
@@ -164,20 +160,9 @@ asmlinkage __irq_entry int do_IRQ(unsigned int irq, struct pt_regs *regs)
"r5", "r6", "r7", "r8", "t", "pr"
);
} else
-#endif
generic_handle_irq(irq);
-
- irq_exit();
-
- set_irq_regs(old_regs);
- return 1;
}
-#ifdef CONFIG_IRQSTACKS
-static char softirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
-
-static char hardirq_stack[NR_CPUS * THREAD_SIZE] __page_aligned_bss;
-
/*
* allocate per-cpu stacks for hardirq and for softirq processing
*/
@@ -257,8 +242,33 @@ asmlinkage void do_softirq(void)
local_irq_restore(flags);
}
+#else
+static inline void handle_one_irq(unsigned int irq)
+{
+ generic_handle_irq(irq);
+}
#endif
+asmlinkage __irq_entry int do_IRQ(unsigned int irq, struct pt_regs *regs)
+{
+ struct pt_regs *old_regs = set_irq_regs(regs);
+
+ irq_enter();
+
+ irq = irq_demux(irq_lookup(irq));
+
+ if (irq != NO_IRQ_IGNORE) {
+ handle_one_irq(irq);
+ irq_finish(irq);
+ }
+
+ irq_exit();
+
+ set_irq_regs(old_regs);
+
+ return IRQ_HANDLED;
+}
+
void __init init_IRQ(void)
{
plat_irq_setup();
@@ -283,3 +293,44 @@ int __init arch_probe_nr_irqs(void)
return 0;
}
#endif
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu)
+{
+ printk(KERN_INFO "IRQ%u: moving from cpu%u to cpu%u\n",
+ irq, desc->node, cpu);
+
+ raw_spin_lock_irq(&desc->lock);
+ desc->chip->set_affinity(irq, cpumask_of(cpu));
+ raw_spin_unlock_irq(&desc->lock);
+}
+
+/*
+ * The 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.
+ */
+void migrate_irqs(void)
+{
+ struct irq_desc *desc;
+ unsigned int irq, cpu = smp_processor_id();
+
+ for_each_irq_desc(irq, desc) {
+ if (desc->node == cpu) {
+ unsigned int newcpu = cpumask_any_and(desc->affinity,
+ cpu_online_mask);
+ if (newcpu >= nr_cpu_ids) {
+ if (printk_ratelimit())
+ printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n",
+ irq, cpu);
+
+ cpumask_setall(desc->affinity);
+ newcpu = cpumask_any_and(desc->affinity,
+ cpu_online_mask);
+ }
+
+ route_irq(desc, irq, newcpu);
+ }
+ }
+}
+#endif