1 files changed, 122 insertions, 43 deletions

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 0f6530117105..4c6cdbaed661 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -1,9 +1,13 @@
 /*
  * 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>
@@ -14,11 +18,27 @@
 
 #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, struct pt_regs *regs)
+{
+        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
  * by the main code to do the right thing. Each driver-visible
- * interrupt source is transparently wired to the apropriate
+ * interrupt source is transparently wired to the appropriate
  * controller. Thus drivers need not be aware of the
  * interrupt-controller.
  *
@@ -28,41 +48,68 @@
  *
  * Controller mappings for all interrupt sources:
  */
-irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = {
+struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned = {
         [0 ... NR_IRQS-1] = {
                 .status = IRQ_DISABLED,
-                .handler = &no_irq_type,
-                .lock = SPIN_LOCK_UNLOCKED
+                .chip = &no_irq_chip,
+                .handle_irq = handle_bad_irq,
+                .depth = 1,
+                .lock = SPIN_LOCK_UNLOCKED,
+#ifdef CONFIG_SMP
+                .affinity = CPU_MASK_ALL
+#endif
         }
 };
 
 /*
- * Generic 'no controller' code
+ * What should we do if we get a hw irq event on an illegal vector?
+ * Each architecture has to answer this themself.
  */
-static void end_none(unsigned int irq) { }
-static void enable_none(unsigned int irq) { }
-static void disable_none(unsigned int irq) { }
-static void shutdown_none(unsigned int irq) { }
-static unsigned int startup_none(unsigned int irq) { return 0; }
-
-static void ack_none(unsigned int irq)
+static void ack_bad(unsigned int irq)
 {
-        /*
-         * 'what should we do if we get a hw irq event on an illegal vector'.
-         * each architecture has to answer this themself.
-         */
+        print_irq_desc(irq, irq_desc + irq);
         ack_bad_irq(irq);
 }
 
-struct hw_interrupt_type no_irq_type = {
-        .typename =     "none",
-        .startup =      startup_none,
-        .shutdown =     shutdown_none,
-        .enable =       enable_none,
-        .disable =      disable_none,
-        .ack =          ack_none,
-        .end =          end_none,
-        .set_affinity = NULL
+/*
+ * NOP functions
+ */
+static void noop(unsigned int irq)
+{
+}
+
+static unsigned int noop_ret(unsigned int irq)
+{
+        return 0;
+}
+
+/*
+ * Generic no controller implementation
+ */
+struct irq_chip no_irq_chip = {
+        .name           = "none",
+        .startup        = noop_ret,
+        .shutdown       = noop,
+        .enable         = noop,
+        .disable        = noop,
+        .ack            = ack_bad,
+        .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,
 };
 
 /*
@@ -73,17 +120,24 @@ irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs)
         return IRQ_NONE;
 }
 
-/*
- * Have got an event to handle:
+/**
+ * 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
  */
-fastcall irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
-                                struct irqaction *action)
+irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
+                             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);
@@ -93,22 +147,30 @@ fastcall irqreturn_t handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
                 action = action->next;
         } while (action);
 
-        if (status & SA_SAMPLE_RANDOM)
+        if (status & IRQF_SAMPLE_RANDOM)
                 add_interrupt_randomness(irq);
         local_irq_disable();
 
         return retval;
 }
 
-/*
- * do_IRQ handles all normal device IRQ's (the special
+#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
  * handlers).
+ *
+ * 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)
 {
-        irq_desc_t *desc = irq_desc + irq;
-        struct irqaction * action;
+        struct irq_desc *desc = irq_desc + irq;
+        struct irqaction *action;
         unsigned int status;
 
         kstat_this_cpu.irqs[irq]++;
@@ -118,16 +180,16 @@ fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs)
                 /*
                  * No locking required for CPU-local interrupts:
                  */
-                if (desc->handler->ack)
-                        desc->handler->ack(irq);
+                if (desc->chip->ack)
+                        desc->chip->ack(irq);
                 action_ret = handle_IRQ_event(irq, regs, desc->action);
-                desc->handler->end(irq);
+                desc->chip->end(irq);
                 return 1;
         }
 
         spin_lock(&desc->lock);
-        if (desc->handler->ack)
-                desc->handler->ack(irq);
+        if (desc->chip->ack)
+                desc->chip->ack(irq);
         /*
          * REPLAY is when Linux resends an IRQ that was dropped earlier
          * WAITING is used by probe to mark irqs that are being tested
@@ -187,9 +249,26 @@ out:
          * The ->end() handler has to deal with interrupts which got
          * disabled while the handler was running.
          */
-        desc->handler->end(irq);
+        desc->chip->end(irq);
         spin_unlock(&desc->lock);
 
         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