1 files changed, 146 insertions, 63 deletions

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 1279e3499534..92be519eff26 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1,12 +1,12 @@
 /*
  * linux/kernel/irq/manage.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
  *
  * This file contains driver APIs to the irq subsystem.
  */
 
-#include <linux/config.h>
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/random.h>
@@ -16,12 +16,6 @@
 
 #ifdef CONFIG_SMP
 
-cpumask_t irq_affinity[NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL };
-
-#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
-cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS];
-#endif
-
 /**
  *      synchronize_irq - wait for pending IRQ handlers (on other CPUs)
  *      @irq: interrupt number to wait for
@@ -42,7 +36,6 @@ void synchronize_irq(unsigned int irq)
         while (desc->status & IRQ_INPROGRESS)
                 cpu_relax();
 }
-
 EXPORT_SYMBOL(synchronize_irq);
 
 #endif
@@ -60,7 +53,7 @@ EXPORT_SYMBOL(synchronize_irq);
  */
 void disable_irq_nosync(unsigned int irq)
 {
-        irq_desc_t *desc = irq_desc + irq;
+        struct irq_desc *desc = irq_desc + irq;
         unsigned long flags;
 
         if (irq >= NR_IRQS)
@@ -69,11 +62,10 @@ void disable_irq_nosync(unsigned int irq)
         spin_lock_irqsave(&desc->lock, flags);
         if (!desc->depth++) {
                 desc->status |= IRQ_DISABLED;
-                desc->handler->disable(irq);
+                desc->chip->disable(irq);
         }
         spin_unlock_irqrestore(&desc->lock, flags);
 }
-
 EXPORT_SYMBOL(disable_irq_nosync);
 
 /**
@@ -90,7 +82,7 @@ EXPORT_SYMBOL(disable_irq_nosync);
  */
 void disable_irq(unsigned int irq)
 {
-        irq_desc_t *desc = irq_desc + irq;
+        struct irq_desc *desc = irq_desc + irq;
 
         if (irq >= NR_IRQS)
                 return;
@@ -99,7 +91,6 @@ void disable_irq(unsigned int irq)
         if (desc->action)
                 synchronize_irq(irq);
 }
-
 EXPORT_SYMBOL(disable_irq);
 
 /**
@@ -114,7 +105,7 @@ EXPORT_SYMBOL(disable_irq);
  */
 void enable_irq(unsigned int irq)
 {
-        irq_desc_t *desc = irq_desc + irq;
+        struct irq_desc *desc = irq_desc + irq;
         unsigned long flags;
 
         if (irq >= NR_IRQS)
@@ -123,17 +114,15 @@ void enable_irq(unsigned int irq)
         spin_lock_irqsave(&desc->lock, flags);
         switch (desc->depth) {
         case 0:
+                printk(KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
                 WARN_ON(1);
                 break;
         case 1: {
                 unsigned int status = desc->status & ~IRQ_DISABLED;
 
-                desc->status = status;
-                if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
-                        desc->status = status | IRQ_REPLAY;
-                        hw_resend_irq(desc->handler,irq);
-                }
-                desc->handler->enable(irq);
+                /* Prevent probing on this irq: */
+                desc->status = status | IRQ_NOPROBE;
+                check_irq_resend(desc, irq);
                 /* fall-through */
         }
         default:
@@ -141,9 +130,53 @@ void enable_irq(unsigned int irq)
         }
         spin_unlock_irqrestore(&desc->lock, flags);
 }
-
 EXPORT_SYMBOL(enable_irq);
 
+/**
+ *      set_irq_wake - control irq power management wakeup
+ *      @irq:   interrupt to control
+ *      @on:    enable/disable power management wakeup
+ *
+ *      Enable/disable power management wakeup mode, which is
+ *      disabled by default.  Enables and disables must match,
+ *      just as they match for non-wakeup mode support.
+ *
+ *      Wakeup mode lets this IRQ wake the system from sleep
+ *      states like "suspend to RAM".
+ */
+int set_irq_wake(unsigned int irq, unsigned int on)
+{
+        struct irq_desc *desc = irq_desc + irq;
+        unsigned long flags;
+        int ret = -ENXIO;
+        int (*set_wake)(unsigned, unsigned) = desc->chip->set_wake;
+
+        /* wakeup-capable irqs can be shared between drivers that
+         * don't need to have the same sleep mode behaviors.
+         */
+        spin_lock_irqsave(&desc->lock, flags);
+        if (on) {
+                if (desc->wake_depth++ == 0)
+                        desc->status |= IRQ_WAKEUP;
+                else
+                        set_wake = NULL;
+        } else {
+                if (desc->wake_depth == 0) {
+                        printk(KERN_WARNING "Unbalanced IRQ %d "
+                                        "wake disable\n", irq);
+                        WARN_ON(1);
+                } else if (--desc->wake_depth == 0)
+                        desc->status &= ~IRQ_WAKEUP;
+                else
+                        set_wake = NULL;
+        }
+        if (set_wake)
+                ret = desc->chip->set_wake(irq, on);
+        spin_unlock_irqrestore(&desc->lock, flags);
+        return ret;
+}
+EXPORT_SYMBOL(set_irq_wake);
+
 /*
  * Internal function that tells the architecture code whether a
  * particular irq has been exclusively allocated or is available
@@ -153,22 +186,33 @@ int can_request_irq(unsigned int irq, unsigned long irqflags)
 {
         struct irqaction *action;
 
-        if (irq >= NR_IRQS)
+        if (irq >= NR_IRQS || irq_desc[irq].status & IRQ_NOREQUEST)
                 return 0;
 
         action = irq_desc[irq].action;
         if (action)
-                if (irqflags & action->flags & SA_SHIRQ)
+                if (irqflags & action->flags & IRQF_SHARED)
                         action = NULL;
 
         return !action;
 }
 
+void compat_irq_chip_set_default_handler(struct irq_desc *desc)
+{
+        /*
+         * If the architecture still has not overriden
+         * the flow handler then zap the default. This
+         * should catch incorrect flow-type setting.
+         */
+        if (desc->handle_irq == &handle_bad_irq)
+                desc->handle_irq = NULL;
+}
+
 /*
  * Internal function to register an irqaction - typically used to
  * allocate special interrupts that are part of the architecture.
  */
-int setup_irq(unsigned int irq, struct irqaction * new)
+int setup_irq(unsigned int irq, struct irqaction *new)
 {
         struct irq_desc *desc = irq_desc + irq;
         struct irqaction *old, **p;
@@ -178,14 +222,14 @@ int setup_irq(unsigned int irq, struct irqaction * new)
         if (irq >= NR_IRQS)
                 return -EINVAL;
 
-        if (desc->handler == &no_irq_type)
+        if (desc->chip == &no_irq_chip)
                 return -ENOSYS;
         /*
          * Some drivers like serial.c use request_irq() heavily,
          * so we have to be careful not to interfere with a
          * running system.
          */
-        if (new->flags & SA_SAMPLE_RANDOM) {
+        if (new->flags & IRQF_SAMPLE_RANDOM) {
                 /*
                  * This function might sleep, we want to call it first,
                  * outside of the atomic block.
@@ -200,16 +244,24 @@ int setup_irq(unsigned int irq, struct irqaction * new)
         /*
          * The following block of code has to be executed atomically
          */
-        spin_lock_irqsave(&desc->lock,flags);
+        spin_lock_irqsave(&desc->lock, flags);
         p = &desc->action;
-        if ((old = *p) != NULL) {
-                /* Can't share interrupts unless both agree to */
-                if (!(old->flags & new->flags & SA_SHIRQ))
+        old = *p;
+        if (old) {
+                /*
+                 * Can't share interrupts unless both agree to and are
+                 * the same type (level, edge, polarity). So both flag
+                 * fields must have IRQF_SHARED set and the bits which
+                 * set the trigger type must match.
+                 */
+                if (!((old->flags & new->flags) & IRQF_SHARED) ||
+                    ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK))
                         goto mismatch;
 
-#if defined(ARCH_HAS_IRQ_PER_CPU) && defined(SA_PERCPU_IRQ)
+#if defined(CONFIG_IRQ_PER_CPU)
                 /* All handlers must agree on per-cpuness */
-                if ((old->flags & IRQ_PER_CPU) != (new->flags & IRQ_PER_CPU))
+                if ((old->flags & IRQF_PERCPU) !=
+                    (new->flags & IRQF_PERCPU))
                         goto mismatch;
 #endif
 
@@ -222,20 +274,45 @@ int setup_irq(unsigned int irq, struct irqaction * new)
         }
 
         *p = new;
-#if defined(ARCH_HAS_IRQ_PER_CPU) && defined(SA_PERCPU_IRQ)
-        if (new->flags & SA_PERCPU_IRQ)
+#if defined(CONFIG_IRQ_PER_CPU)
+        if (new->flags & IRQF_PERCPU)
                 desc->status |= IRQ_PER_CPU;
 #endif
         if (!shared) {
-                desc->depth = 0;
-                desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT |
-                                  IRQ_WAITING | IRQ_INPROGRESS);
-                if (desc->handler->startup)
-                        desc->handler->startup(irq);
-                else
-                        desc->handler->enable(irq);
+                irq_chip_set_defaults(desc->chip);
+
+                /* Setup the type (level, edge polarity) if configured: */
+                if (new->flags & IRQF_TRIGGER_MASK) {
+                        if (desc->chip && desc->chip->set_type)
+                                desc->chip->set_type(irq,
+                                                new->flags & IRQF_TRIGGER_MASK);
+                        else
+                                /*
+                                 * IRQF_TRIGGER_* but the PIC does not support
+                                 * multiple flow-types?
+                                 */
+                                printk(KERN_WARNING "No IRQF_TRIGGER set_type "
+                                       "function for IRQ %d (%s)\n", irq,
+                                       desc->chip ? desc->chip->name :
+                                       "unknown");
+                } else
+                        compat_irq_chip_set_default_handler(desc);
+
+                desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
+                                  IRQ_INPROGRESS);
+
+                if (!(desc->status & IRQ_NOAUTOEN)) {
+                        desc->depth = 0;
+                        desc->status &= ~IRQ_DISABLED;
+                        if (desc->chip->startup)
+                                desc->chip->startup(irq);
+                        else
+                                desc->chip->enable(irq);
+                } else
+                        /* Undo nested disables: */
+                        desc->depth = 1;
         }
-        spin_unlock_irqrestore(&desc->lock,flags);
+        spin_unlock_irqrestore(&desc->lock, flags);
 
         new->irq = irq;
         register_irq_proc(irq);
@@ -246,8 +323,8 @@ int setup_irq(unsigned int irq, struct irqaction * new)
 
 mismatch:
         spin_unlock_irqrestore(&desc->lock, flags);
-        if (!(new->flags & SA_PROBEIRQ)) {
-                printk(KERN_ERR "%s: irq handler mismatch\n", __FUNCTION__);
+        if (!(new->flags & IRQF_PROBE_SHARED)) {
+                printk(KERN_ERR "IRQ handler type mismatch for IRQ %d\n", irq);
                 dump_stack();
         }
         return -EBUSY;
@@ -278,10 +355,10 @@ void free_irq(unsigned int irq, void *dev_id)
                 return;
 
         desc = irq_desc + irq;
-        spin_lock_irqsave(&desc->lock,flags);
+        spin_lock_irqsave(&desc->lock, flags);
         p = &desc->action;
         for (;;) {
-                struct irqaction * action = *p;
+                struct irqaction *action = *p;
 
                 if (action) {
                         struct irqaction **pp = p;
@@ -295,18 +372,18 @@ void free_irq(unsigned int irq, void *dev_id)
 
                         /* Currently used only by UML, might disappear one day.*/
 #ifdef CONFIG_IRQ_RELEASE_METHOD
-                        if (desc->handler->release)
-                                desc->handler->release(irq, dev_id);
+                        if (desc->chip->release)
+                                desc->chip->release(irq, dev_id);
 #endif
 
                         if (!desc->action) {
                                 desc->status |= IRQ_DISABLED;
-                                if (desc->handler->shutdown)
-                                        desc->handler->shutdown(irq);
+                                if (desc->chip->shutdown)
+                                        desc->chip->shutdown(irq);
                                 else
-                                        desc->handler->disable(irq);
+                                        desc->chip->disable(irq);
                         }
-                        spin_unlock_irqrestore(&desc->lock,flags);
+                        spin_unlock_irqrestore(&desc->lock, flags);
                         unregister_handler_proc(irq, action);
 
                         /* Make sure it's not being used on another CPU */
@@ -314,12 +391,11 @@ void free_irq(unsigned int irq, void *dev_id)
                         kfree(action);
                         return;
                 }
-                printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
-                spin_unlock_irqrestore(&desc->lock,flags);
+                printk(KERN_ERR "Trying to free already-free IRQ %d\n", irq);
+                spin_unlock_irqrestore(&desc->lock, flags);
                 return;
         }
 }
-
 EXPORT_SYMBOL(free_irq);
 
 /**
@@ -346,28 +422,36 @@ EXPORT_SYMBOL(free_irq);
  *
  *      Flags:
  *
- *      SA_SHIRQ                Interrupt is shared
- *      SA_INTERRUPT            Disable local interrupts while processing
- *      SA_SAMPLE_RANDOM        The interrupt can be used for entropy
+ *      IRQF_SHARED             Interrupt is shared
+ *      IRQF_DISABLED   Disable local interrupts while processing
+ *      IRQF_SAMPLE_RANDOM      The interrupt can be used for entropy
  *
  */
 int request_irq(unsigned int irq,
                 irqreturn_t (*handler)(int, void *, struct pt_regs *),
-                unsigned long irqflags, const char * devname, void *dev_id)
+                unsigned long irqflags, const char *devname, void *dev_id)
 {
-        struct irqaction * action;
+        struct irqaction *action;
         int retval;
 
+#ifdef CONFIG_LOCKDEP
+        /*
+         * Lockdep wants atomic interrupt handlers:
+         */
+        irqflags |= SA_INTERRUPT;
+#endif
         /*
          * Sanity-check: shared interrupts must pass in a real dev-ID,
          * otherwise we'll have trouble later trying to figure out
          * which interrupt is which (messes up the interrupt freeing
          * logic etc).
          */
-        if ((irqflags & SA_SHIRQ) && !dev_id)
+        if ((irqflags & IRQF_SHARED) && !dev_id)
                 return -EINVAL;
         if (irq >= NR_IRQS)
                 return -EINVAL;
+        if (irq_desc[irq].status & IRQ_NOREQUEST)
+                return -EINVAL;
         if (!handler)
                 return -EINVAL;
 
@@ -390,6 +474,5 @@ int request_irq(unsigned int irq,
 
         return retval;
 }
-
 EXPORT_SYMBOL(request_irq);