/*
* linux/kernel/irq/handle.c
*
- * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
+ * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
+ * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
*
* This file contains the core interrupt handling code.
+ *
+ * Detailed information is available in Documentation/DocBook/genericirq
+ *
*/
#include <linux/irq.h>
#include "internals.h"
+/**
+ * handle_bad_irq - handle spurious and unhandled irqs
+ * @irq: the interrupt number
+ * @desc: description of the interrupt
+ * @regs: pointer to a register structure
+ *
+ * Handles spurious and unhandled IRQ's. It also prints a debugmessage.
+ */
+void fastcall
+handle_bad_irq(unsigned int irq, struct irq_desc *desc)
+{
+ print_irq_desc(irq, desc);
+ kstat_this_cpu.irqs[irq]++;
+ ack_bad_irq(irq);
+}
+
/*
* Linux has a controller-independent interrupt architecture.
* Every controller has a 'controller-template', that is used
struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned = {
[0 ... NR_IRQS-1] = {
.status = IRQ_DISABLED,
- .chip = &no_irq_type,
+ .chip = &no_irq_chip,
+ .handle_irq = handle_bad_irq,
.depth = 1,
.lock = SPIN_LOCK_UNLOCKED,
#ifdef CONFIG_SMP
*/
static void ack_bad(unsigned int irq)
{
+ print_irq_desc(irq, irq_desc + irq);
ack_bad_irq(irq);
}
/*
* Generic no controller implementation
*/
-struct hw_interrupt_type no_irq_type = {
- .typename = "none",
+struct irq_chip no_irq_chip = {
+ .name = "none",
.startup = noop_ret,
.shutdown = noop,
.enable = noop,
.end = noop,
};
+/*
+ * Generic dummy implementation which can be used for
+ * real dumb interrupt sources
+ */
+struct irq_chip dummy_irq_chip = {
+ .name = "dummy",
+ .startup = noop_ret,
+ .shutdown = noop,
+ .enable = noop,
+ .disable = noop,
+ .ack = noop,
+ .mask = noop,
+ .unmask = noop,
+ .end = noop,
+};
+
/*
* Special, empty irq handler:
*/
-irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs)
+irqreturn_t no_action(int cpl, void *dev_id)
{
return IRQ_NONE;
}
/**
* handle_IRQ_event - irq action chain handler
* @irq: the interrupt number
- * @regs: pointer to a register structure
* @action: the interrupt action chain for this irq
*
* Handles the action chain of an irq event
*/
-irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
- struct irqaction *action)
+irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
{
irqreturn_t ret, retval = IRQ_NONE;
unsigned int status = 0;
- if (!(action->flags & SA_INTERRUPT))
- local_irq_enable();
+ handle_dynamic_tick(action);
+
+ if (!(action->flags & IRQF_DISABLED))
+ local_irq_enable_in_hardirq();
do {
- ret = action->handler(irq, action->dev_id, regs);
+ ret = action->handler(irq, action->dev_id);
if (ret == IRQ_HANDLED)
status |= action->flags;
retval |= ret;
action = action->next;
} while (action);
- if (status & SA_SAMPLE_RANDOM)
+ if (status & IRQF_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
local_irq_disable();
return retval;
}
+#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
/**
* __do_IRQ - original all in one highlevel IRQ handler
* @irq: the interrupt number
- * @regs: pointer to a register structure
*
* __do_IRQ handles all normal device IRQ's (the special
* SMP cross-CPU interrupts have their own specific
* This is the original x86 implementation which is used for every
* interrupt type.
*/
-fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs)
+fastcall unsigned int __do_IRQ(unsigned int irq)
{
struct irq_desc *desc = irq_desc + irq;
struct irqaction *action;
*/
if (desc->chip->ack)
desc->chip->ack(irq);
- action_ret = handle_IRQ_event(irq, regs, desc->action);
+ action_ret = handle_IRQ_event(irq, desc->action);
desc->chip->end(irq);
return 1;
}
spin_unlock(&desc->lock);
- action_ret = handle_IRQ_event(irq, regs, action);
+ action_ret = handle_IRQ_event(irq, action);
spin_lock(&desc->lock);
if (!noirqdebug)
- note_interrupt(irq, desc, action_ret, regs);
+ note_interrupt(irq, desc, action_ret);
if (likely(!(desc->status & IRQ_PENDING)))
break;
desc->status &= ~IRQ_PENDING;
return 1;
}
+#endif
+#ifdef CONFIG_TRACE_IRQFLAGS
+
+/*
+ * lockdep: we want to handle all irq_desc locks as a single lock-class:
+ */
+static struct lock_class_key irq_desc_lock_class;
+
+void early_init_irq_lock_class(void)
+{
+ int i;
+
+ for (i = 0; i < NR_IRQS; i++)
+ lockdep_set_class(&irq_desc[i].lock, &irq_desc_lock_class);
+}
+
+#endif