irq: update all arches for new irq_desc
[linux-2.6.git] / arch / arm / kernel / irq.c
index bcc19fb..4bb723e 100644 (file)
  *  IRQ's are in fact implemented a bit like signal handlers for the kernel.
  *  Naturally it's not a 1:1 relation, but there are similarities.
  */
-#include <linux/config.h>
 #include <linux/kernel_stat.h>
 #include <linux/module.h>
 #include <linux/signal.h>
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
-#include <linux/ptrace.h>
+#include <linux/irq.h>
 #include <linux/slab.h>
 #include <linux/random.h>
 #include <linux/smp.h>
 #include <linux/kallsyms.h>
 #include <linux/proc_fs.h>
 
-#include <asm/irq.h>
 #include <asm/system.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/time.h>
 
 /*
- * Maximum IRQ count.  Currently, this is arbitary.  However, it should
- * not be set too low to prevent false triggering.  Conversely, if it
- * is set too high, then you could miss a stuck IRQ.
- *
- * Maybe we ought to set a timer and re-enable the IRQ at a later time?
- */
-#define MAX_IRQ_CNT    100000
-
-static int noirqdebug;
-static volatile unsigned long irq_err_count;
-static DEFINE_SPINLOCK(irq_controller_lock);
-static LIST_HEAD(irq_pending);
-
-struct irqdesc irq_desc[NR_IRQS];
-void (*init_arch_irq)(void) __initdata = NULL;
-
-/*
  * No architecture-specific irq_finish function defined in arm/arch/irqs.h.
  */
 #ifndef irq_finish
 #define irq_finish(irq) do { } while (0)
 #endif
 
-/*
- * Dummy mask/unmask handler
- */
-void dummy_mask_unmask_irq(unsigned int irq)
-{
-}
-
-irqreturn_t no_action(int irq, void *dev_id, struct pt_regs *regs)
-{
-       return IRQ_NONE;
-}
-
-void do_bad_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
-{
-       irq_err_count += 1;
-       printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
-}
-
-static struct irqchip bad_chip = {
-       .ack    = dummy_mask_unmask_irq,
-       .mask   = dummy_mask_unmask_irq,
-       .unmask = dummy_mask_unmask_irq,
-};
-
-static struct irqdesc bad_irq_desc = {
-       .chip           = &bad_chip,
-       .handle         = do_bad_IRQ,
-       .pend           = LIST_HEAD_INIT(bad_irq_desc.pend),
-       .disable_depth  = 1,
-};
-
-#ifdef CONFIG_SMP
-void synchronize_irq(unsigned int irq)
-{
-       struct irqdesc *desc = irq_desc + irq;
-
-       while (desc->running)
-               barrier();
-}
-EXPORT_SYMBOL(synchronize_irq);
-
-#define smp_set_running(desc)  do { desc->running = 1; } while (0)
-#define smp_clear_running(desc)        do { desc->running = 0; } while (0)
-#else
-#define smp_set_running(desc)  do { } while (0)
-#define smp_clear_running(desc)        do { } while (0)
-#endif
-
-/**
- *     disable_irq_nosync - disable an irq without waiting
- *     @irq: Interrupt to disable
- *
- *     Disable the selected interrupt line.  Enables and disables
- *     are nested.  We do this lazily.
- *
- *     This function may be called from IRQ context.
- */
-void disable_irq_nosync(unsigned int irq)
-{
-       struct irqdesc *desc = irq_desc + irq;
-       unsigned long flags;
-
-       spin_lock_irqsave(&irq_controller_lock, flags);
-       desc->disable_depth++;
-       list_del_init(&desc->pend);
-       spin_unlock_irqrestore(&irq_controller_lock, flags);
-}
-EXPORT_SYMBOL(disable_irq_nosync);
-
-/**
- *     disable_irq - disable an irq and wait for completion
- *     @irq: Interrupt to disable
- *
- *     Disable the selected interrupt line.  Enables and disables
- *     are nested.  This functions waits for any pending IRQ
- *     handlers for this interrupt to complete before returning.
- *     If you use this function while holding a resource the IRQ
- *     handler may need you will deadlock.
- *
- *     This function may be called - with care - from IRQ context.
- */
-void disable_irq(unsigned int irq)
-{
-       struct irqdesc *desc = irq_desc + irq;
-
-       disable_irq_nosync(irq);
-       if (desc->action)
-               synchronize_irq(irq);
-}
-EXPORT_SYMBOL(disable_irq);
-
-/**
- *     enable_irq - enable interrupt handling on an irq
- *     @irq: Interrupt to enable
- *
- *     Re-enables the processing of interrupts on this IRQ line.
- *     Note that this may call the interrupt handler, so you may
- *     get unexpected results if you hold IRQs disabled.
- *
- *     This function may be called from IRQ context.
- */
-void enable_irq(unsigned int irq)
-{
-       struct irqdesc *desc = irq_desc + irq;
-       unsigned long flags;
-
-       spin_lock_irqsave(&irq_controller_lock, flags);
-       if (unlikely(!desc->disable_depth)) {
-               printk("enable_irq(%u) unbalanced from %p\n", irq,
-                       __builtin_return_address(0));
-       } else if (!--desc->disable_depth) {
-               desc->probing = 0;
-               desc->chip->unmask(irq);
-
-               /*
-                * If the interrupt is waiting to be processed,
-                * try to re-run it.  We can't directly run it
-                * from here since the caller might be in an
-                * interrupt-protected region.
-                */
-               if (desc->pending && list_empty(&desc->pend)) {
-                       desc->pending = 0;
-                       if (!desc->chip->retrigger ||
-                           desc->chip->retrigger(irq))
-                               list_add(&desc->pend, &irq_pending);
-               }
-       }
-       spin_unlock_irqrestore(&irq_controller_lock, flags);
-}
-EXPORT_SYMBOL(enable_irq);
-
-/*
- * Enable wake on selected irq
- */
-void enable_irq_wake(unsigned int irq)
-{
-       struct irqdesc *desc = irq_desc + irq;
-       unsigned long flags;
-
-       spin_lock_irqsave(&irq_controller_lock, flags);
-       if (desc->chip->set_wake)
-               desc->chip->set_wake(irq, 1);
-       spin_unlock_irqrestore(&irq_controller_lock, flags);
-}
-EXPORT_SYMBOL(enable_irq_wake);
-
-void disable_irq_wake(unsigned int irq)
-{
-       struct irqdesc *desc = irq_desc + irq;
-       unsigned long flags;
-
-       spin_lock_irqsave(&irq_controller_lock, flags);
-       if (desc->chip->set_wake)
-               desc->chip->set_wake(irq, 0);
-       spin_unlock_irqrestore(&irq_controller_lock, flags);
-}
-EXPORT_SYMBOL(disable_irq_wake);
+void (*init_arch_irq)(void) __initdata = NULL;
+unsigned long irq_err_count;
 
 int show_interrupts(struct seq_file *p, void *v)
 {
@@ -243,21 +69,22 @@ int show_interrupts(struct seq_file *p, void *v)
        }
 
        if (i < NR_IRQS) {
-               spin_lock_irqsave(&irq_controller_lock, flags);
-               action = irq_desc[i].action;
+               spin_lock_irqsave(&irq_desc[i].lock, flags);
+               action = irq_desc[i].action;
                if (!action)
                        goto unlock;
 
                seq_printf(p, "%3d: ", i);
                for_each_present_cpu(cpu)
                        seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[i]);
+               seq_printf(p, " %10s", irq_desc[i].chip->name ? : "-");
                seq_printf(p, "  %s", action->name);
                for (action = action->next; action; action = action->next)
                        seq_printf(p, ", %s", action->name);
 
                seq_putc(p, '\n');
 unlock:
-               spin_unlock_irqrestore(&irq_controller_lock, flags);
+               spin_unlock_irqrestore(&irq_desc[i].lock, flags);
        } else if (i == NR_IRQS) {
 #ifdef CONFIG_ARCH_ACORN
                show_fiq_list(p, v);
@@ -271,378 +98,47 @@ unlock:
        return 0;
 }
 
-/*
- * IRQ lock detection.
- *
- * Hopefully, this should get us out of a few locked situations.
- * However, it may take a while for this to happen, since we need
- * a large number if IRQs to appear in the same jiffie with the
- * same instruction pointer (or within 2 instructions).
- */
-static int check_irq_lock(struct irqdesc *desc, int irq, struct pt_regs *regs)
-{
-       unsigned long instr_ptr = instruction_pointer(regs);
-
-       if (desc->lck_jif == jiffies &&
-           desc->lck_pc >= instr_ptr && desc->lck_pc < instr_ptr + 8) {
-               desc->lck_cnt += 1;
-
-               if (desc->lck_cnt > MAX_IRQ_CNT) {
-                       printk(KERN_ERR "IRQ LOCK: IRQ%d is locking the system, disabled\n", irq);
-                       return 1;
-               }
-       } else {
-               desc->lck_cnt = 0;
-               desc->lck_pc  = instruction_pointer(regs);
-               desc->lck_jif = jiffies;
-       }
-       return 0;
-}
-
-static void
-report_bad_irq(unsigned int irq, struct pt_regs *regs, struct irqdesc *desc, int ret)
-{
-       static int count = 100;
-       struct irqaction *action;
-
-       if (noirqdebug)
-               return;
-
-       if (ret != IRQ_HANDLED && ret != IRQ_NONE) {
-               if (!count)
-                       return;
-               count--;
-               printk("irq%u: bogus retval mask %x\n", irq, ret);
-       } else {
-               desc->irqs_unhandled++;
-               if (desc->irqs_unhandled <= 99900)
-                       return;
-               desc->irqs_unhandled = 0;
-               printk("irq%u: nobody cared\n", irq);
-       }
-       show_regs(regs);
-       dump_stack();
-       printk(KERN_ERR "handlers:");
-       action = desc->action;
-       do {
-               printk("\n" KERN_ERR "[<%p>]", action->handler);
-               print_symbol(" (%s)", (unsigned long)action->handler);
-               action = action->next;
-       } while (action);
-       printk("\n");
-}
-
-static int
-__do_irq(unsigned int irq, struct irqaction *action, struct pt_regs *regs)
-{
-       unsigned int status;
-       int ret, retval = 0;
-
-       spin_unlock(&irq_controller_lock);
+/* Handle bad interrupts */
+static struct irq_desc bad_irq_desc = {
+       .handle_irq = handle_bad_irq,
+       .lock = SPIN_LOCK_UNLOCKED
+};
 
-#ifdef CONFIG_NO_IDLE_HZ
-       if (!(action->flags & SA_TIMER) && system_timer->dyn_tick != NULL) {
-               spin_lock(&system_timer->dyn_tick->lock);
-               if (system_timer->dyn_tick->state & DYN_TICK_ENABLED)
-                       system_timer->dyn_tick->handler(irq, 0, regs);
-               spin_unlock(&system_timer->dyn_tick->lock);
-       }
+#ifdef CONFIG_CPUMASK_OFFSTACK
+/* We are not allocating bad_irq_desc.affinity or .pending_mask */
+#error "ARM architecture does not support CONFIG_CPUMASK_OFFSTACK."
 #endif
 
-       if (!(action->flags & SA_INTERRUPT))
-               local_irq_enable();
-
-       status = 0;
-       do {
-               ret = action->handler(irq, action->dev_id, regs);
-               if (ret == IRQ_HANDLED)
-                       status |= action->flags;
-               retval |= ret;
-               action = action->next;
-       } while (action);
-
-       if (status & SA_SAMPLE_RANDOM)
-               add_interrupt_randomness(irq);
-
-       spin_lock_irq(&irq_controller_lock);
-
-       return retval;
-}
-
-/*
- * This is for software-decoded IRQs.  The caller is expected to
- * handle the ack, clear, mask and unmask issues.
- */
-void
-do_simple_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
-{
-       struct irqaction *action;
-       const unsigned int cpu = smp_processor_id();
-
-       desc->triggered = 1;
-
-       kstat_cpu(cpu).irqs[irq]++;
-
-       smp_set_running(desc);
-
-       action = desc->action;
-       if (action) {
-               int ret = __do_irq(irq, action, regs);
-               if (ret != IRQ_HANDLED)
-                       report_bad_irq(irq, regs, desc, ret);
-       }
-
-       smp_clear_running(desc);
-}
-
-/*
- * Most edge-triggered IRQ implementations seem to take a broken
- * approach to this.  Hence the complexity.
- */
-void
-do_edge_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
-{
-       const unsigned int cpu = smp_processor_id();
-
-       desc->triggered = 1;
-
-       /*
-        * If we're currently running this IRQ, or its disabled,
-        * we shouldn't process the IRQ.  Instead, turn on the
-        * hardware masks.
-        */
-       if (unlikely(desc->running || desc->disable_depth))
-               goto running;
-
-       /*
-        * Acknowledge and clear the IRQ, but don't mask it.
-        */
-       desc->chip->ack(irq);
-
-       /*
-        * Mark the IRQ currently in progress.
-        */
-       desc->running = 1;
-
-       kstat_cpu(cpu).irqs[irq]++;
-
-       do {
-               struct irqaction *action;
-
-               action = desc->action;
-               if (!action)
-                       break;
-
-               if (desc->pending && !desc->disable_depth) {
-                       desc->pending = 0;
-                       desc->chip->unmask(irq);
-               }
-
-               __do_irq(irq, action, regs);
-       } while (desc->pending && !desc->disable_depth);
-
-       desc->running = 0;
-
-       /*
-        * If we were disabled or freed, shut down the handler.
-        */
-       if (likely(desc->action && !check_irq_lock(desc, irq, regs)))
-               return;
-
- running:
-       /*
-        * We got another IRQ while this one was masked or
-        * currently running.  Delay it.
-        */
-       desc->pending = 1;
-       desc->chip->mask(irq);
-       desc->chip->ack(irq);
-}
-
-/*
- * Level-based IRQ handler.  Nice and simple.
- */
-void
-do_level_IRQ(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
-{
-       struct irqaction *action;
-       const unsigned int cpu = smp_processor_id();
-
-       desc->triggered = 1;
-
-       /*
-        * Acknowledge, clear _AND_ disable the interrupt.
-        */
-       desc->chip->ack(irq);
-
-       if (likely(!desc->disable_depth)) {
-               kstat_cpu(cpu).irqs[irq]++;
-
-               smp_set_running(desc);
-
-               /*
-                * Return with this interrupt masked if no action
-                */
-               action = desc->action;
-               if (action) {
-                       int ret = __do_irq(irq, desc->action, regs);
-
-                       if (ret != IRQ_HANDLED)
-                               report_bad_irq(irq, regs, desc, ret);
-
-                       if (likely(!desc->disable_depth &&
-                                  !check_irq_lock(desc, irq, regs)))
-                               desc->chip->unmask(irq);
-               }
-
-               smp_clear_running(desc);
-       }
-}
-
-static void do_pending_irqs(struct pt_regs *regs)
-{
-       struct list_head head, *l, *n;
-
-       do {
-               struct irqdesc *desc;
-
-               /*
-                * First, take the pending interrupts off the list.
-                * The act of calling the handlers may add some IRQs
-                * back onto the list.
-                */
-               head = irq_pending;
-               INIT_LIST_HEAD(&irq_pending);
-               head.next->prev = &head;
-               head.prev->next = &head;
-
-               /*
-                * Now run each entry.  We must delete it from our
-                * list before calling the handler.
-                */
-               list_for_each_safe(l, n, &head) {
-                       desc = list_entry(l, struct irqdesc, pend);
-                       list_del_init(&desc->pend);
-                       desc_handle_irq(desc - irq_desc, desc, regs);
-               }
-
-               /*
-                * The list must be empty.
-                */
-               BUG_ON(!list_empty(&head));
-       } while (!list_empty(&irq_pending));
-}
-
 /*
  * do_IRQ handles all hardware IRQ's.  Decoded IRQs should not
  * come via this function.  Instead, they should provide their
  * own 'handler'
  */
-asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
+asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
 {
-       struct irqdesc *desc = irq_desc + irq;
+       struct pt_regs *old_regs = set_irq_regs(regs);
+
+       irq_enter();
 
        /*
         * Some hardware gives randomly wrong interrupts.  Rather
         * than crashing, do something sensible.
         */
        if (irq >= NR_IRQS)
-               desc = &bad_irq_desc;
-
-       irq_enter();
-       spin_lock(&irq_controller_lock);
-       desc_handle_irq(irq, desc, regs);
-
-       /*
-        * Now re-run any pending interrupts.
-        */
-       if (!list_empty(&irq_pending))
-               do_pending_irqs(regs);
+               handle_bad_irq(irq, &bad_irq_desc);
+       else
+               generic_handle_irq(irq);
 
+       /* AT91 specific workaround */
        irq_finish(irq);
 
-       spin_unlock(&irq_controller_lock);
        irq_exit();
+       set_irq_regs(old_regs);
 }
 
-void __set_irq_handler(unsigned int irq, irq_handler_t handle, int is_chained)
-{
-       struct irqdesc *desc;
-       unsigned long flags;
-
-       if (irq >= NR_IRQS) {
-               printk(KERN_ERR "Trying to install handler for IRQ%d\n", irq);
-               return;
-       }
-
-       if (handle == NULL)
-               handle = do_bad_IRQ;
-
-       desc = irq_desc + irq;
-
-       if (is_chained && desc->chip == &bad_chip)
-               printk(KERN_WARNING "Trying to install chained handler for IRQ%d\n", irq);
-
-       spin_lock_irqsave(&irq_controller_lock, flags);
-       if (handle == do_bad_IRQ) {
-               desc->chip->mask(irq);
-               desc->chip->ack(irq);
-               desc->disable_depth = 1;
-       }
-       desc->handle = handle;
-       if (handle != do_bad_IRQ && is_chained) {
-               desc->valid = 0;
-               desc->probe_ok = 0;
-               desc->disable_depth = 0;
-               desc->chip->unmask(irq);
-       }
-       spin_unlock_irqrestore(&irq_controller_lock, flags);
-}
-
-void set_irq_chip(unsigned int irq, struct irqchip *chip)
-{
-       struct irqdesc *desc;
-       unsigned long flags;
-
-       if (irq >= NR_IRQS) {
-               printk(KERN_ERR "Trying to install chip for IRQ%d\n", irq);
-               return;
-       }
-
-       if (chip == NULL)
-               chip = &bad_chip;
-
-       desc = irq_desc + irq;
-       spin_lock_irqsave(&irq_controller_lock, flags);
-       desc->chip = chip;
-       spin_unlock_irqrestore(&irq_controller_lock, flags);
-}
-
-int set_irq_type(unsigned int irq, unsigned int type)
-{
-       struct irqdesc *desc;
-       unsigned long flags;
-       int ret = -ENXIO;
-
-       if (irq >= NR_IRQS) {
-               printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
-               return -ENODEV;
-       }
-
-       desc = irq_desc + irq;
-       if (desc->chip->set_type) {
-               spin_lock_irqsave(&irq_controller_lock, flags);
-               ret = desc->chip->set_type(irq, type);
-               spin_unlock_irqrestore(&irq_controller_lock, flags);
-       }
-
-       return ret;
-}
-EXPORT_SYMBOL(set_irq_type);
-
 void set_irq_flags(unsigned int irq, unsigned int iflags)
 {
-       struct irqdesc *desc;
+       struct irq_desc *desc;
        unsigned long flags;
 
        if (irq >= NR_IRQS) {
@@ -651,422 +147,42 @@ void set_irq_flags(unsigned int irq, unsigned int iflags)
        }
 
        desc = irq_desc + irq;
-       spin_lock_irqsave(&irq_controller_lock, flags);
-       desc->valid = (iflags & IRQF_VALID) != 0;
-       desc->probe_ok = (iflags & IRQF_PROBE) != 0;
-       desc->noautoenable = (iflags & IRQF_NOAUTOEN) != 0;
-       spin_unlock_irqrestore(&irq_controller_lock, flags);
-}
-
-int setup_irq(unsigned int irq, struct irqaction *new)
-{
-       int shared = 0;
-       struct irqaction *old, **p;
-       unsigned long flags;
-       struct irqdesc *desc;
-
-       /*
-        * 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) {
-               /*
-                * This function might sleep, we want to call it first,
-                * outside of the atomic block.
-                * Yes, this might clear the entropy pool if the wrong
-                * driver is attempted to be loaded, without actually
-                * installing a new handler, but is this really a problem,
-                * only the sysadmin is able to do this.
-                */
-               rand_initialize_irq(irq);
-       }
-
-       /*
-        * The following block of code has to be executed atomically
-        */
-       desc = irq_desc + irq;
-       spin_lock_irqsave(&irq_controller_lock, flags);
-       p = &desc->action;
-       if ((old = *p) != NULL) {
-               /*
-                * Can't share interrupts unless both agree to and are
-                * the same type.
-                */
-               if (!(old->flags & new->flags & SA_SHIRQ) ||
-                   (~old->flags & new->flags) & SA_TRIGGER_MASK) {
-                       spin_unlock_irqrestore(&irq_controller_lock, flags);
-                       return -EBUSY;
-               }
-
-               /* add new interrupt at end of irq queue */
-               do {
-                       p = &old->next;
-                       old = *p;
-               } while (old);
-               shared = 1;
-       }
-
-       *p = new;
-
-       if (!shared) {
-               desc->probing = 0;
-               desc->running = 0;
-               desc->pending = 0;
-               desc->disable_depth = 1;
-
-               if (new->flags & SA_TRIGGER_MASK &&
-                   desc->chip->set_type) {
-                       unsigned int type = new->flags & SA_TRIGGER_MASK;
-                       desc->chip->set_type(irq, type);
-               }
-
-               if (!desc->noautoenable) {
-                       desc->disable_depth = 0;
-                       desc->chip->unmask(irq);
-               }
-       }
-
-       spin_unlock_irqrestore(&irq_controller_lock, flags);
-       return 0;
-}
-
-/**
- *     request_irq - allocate an interrupt line
- *     @irq: Interrupt line to allocate
- *     @handler: Function to be called when the IRQ occurs
- *     @irqflags: Interrupt type flags
- *     @devname: An ascii name for the claiming device
- *     @dev_id: A cookie passed back to the handler function
- *
- *     This call allocates interrupt resources and enables the
- *     interrupt line and IRQ handling. From the point this
- *     call is made your handler function may be invoked. Since
- *     your handler function must clear any interrupt the board
- *     raises, you must take care both to initialise your hardware
- *     and to set up the interrupt handler in the right order.
- *
- *     Dev_id must be globally unique. Normally the address of the
- *     device data structure is used as the cookie. Since the handler
- *     receives this value it makes sense to use it.
- *
- *     If your interrupt is shared you must pass a non NULL dev_id
- *     as this is required when freeing the interrupt.
- *
- *     Flags:
- *
- *     SA_SHIRQ                Interrupt is shared
- *
- *     SA_INTERRUPT            Disable local interrupts while processing
- *
- *     SA_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 irq_flags, const char * devname, void *dev_id)
-{
-       unsigned long retval;
-       struct irqaction *action;
-
-       if (irq >= NR_IRQS || !irq_desc[irq].valid || !handler ||
-           (irq_flags & SA_SHIRQ && !dev_id))
-               return -EINVAL;
-
-       action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
-       if (!action)
-               return -ENOMEM;
-
-       action->handler = handler;
-       action->flags = irq_flags;
-       cpus_clear(action->mask);
-       action->name = devname;
-       action->next = NULL;
-       action->dev_id = dev_id;
-
-       retval = setup_irq(irq, action);
-
-       if (retval)
-               kfree(action);
-       return retval;
-}
-
-EXPORT_SYMBOL(request_irq);
-
-/**
- *     free_irq - free an interrupt
- *     @irq: Interrupt line to free
- *     @dev_id: Device identity to free
- *
- *     Remove an interrupt handler. The handler is removed and if the
- *     interrupt line is no longer in use by any driver it is disabled.
- *     On a shared IRQ the caller must ensure the interrupt is disabled
- *     on the card it drives before calling this function.
- *
- *     This function must not be called from interrupt context.
- */
-void free_irq(unsigned int irq, void *dev_id)
-{
-       struct irqaction * action, **p;
-       unsigned long flags;
-
-       if (irq >= NR_IRQS || !irq_desc[irq].valid) {
-               printk(KERN_ERR "Trying to free IRQ%d\n",irq);
-               dump_stack();
-               return;
-       }
-
-       spin_lock_irqsave(&irq_controller_lock, flags);
-       for (p = &irq_desc[irq].action; (action = *p) != NULL; p = &action->next) {
-               if (action->dev_id != dev_id)
-                       continue;
-
-               /* Found it - now free it */
-               *p = action->next;
-               break;
-       }
-       spin_unlock_irqrestore(&irq_controller_lock, flags);
-
-       if (!action) {
-               printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
-               dump_stack();
-       } else {
-               synchronize_irq(irq);
-               kfree(action);
-       }
-}
-
-EXPORT_SYMBOL(free_irq);
-
-static DECLARE_MUTEX(probe_sem);
-
-/* Start the interrupt probing.  Unlike other architectures,
- * we don't return a mask of interrupts from probe_irq_on,
- * but return the number of interrupts enabled for the probe.
- * The interrupts which have been enabled for probing is
- * instead recorded in the irq_desc structure.
- */
-unsigned long probe_irq_on(void)
-{
-       unsigned int i, irqs = 0;
-       unsigned long delay;
-
-       down(&probe_sem);
-
-       /*
-        * first snaffle up any unassigned but
-        * probe-able interrupts
-        */
-       spin_lock_irq(&irq_controller_lock);
-       for (i = 0; i < NR_IRQS; i++) {
-               if (!irq_desc[i].probe_ok || irq_desc[i].action)
-                       continue;
-
-               irq_desc[i].probing = 1;
-               irq_desc[i].triggered = 0;
-               if (irq_desc[i].chip->set_type)
-                       irq_desc[i].chip->set_type(i, IRQT_PROBE);
-               irq_desc[i].chip->unmask(i);
-               irqs += 1;
-       }
-       spin_unlock_irq(&irq_controller_lock);
-
-       /*
-        * wait for spurious interrupts to mask themselves out again
-        */
-       for (delay = jiffies + HZ/10; time_before(jiffies, delay); )
-               /* min 100ms delay */;
-
-       /*
-        * now filter out any obviously spurious interrupts
-        */
-       spin_lock_irq(&irq_controller_lock);
-       for (i = 0; i < NR_IRQS; i++) {
-               if (irq_desc[i].probing && irq_desc[i].triggered) {
-                       irq_desc[i].probing = 0;
-                       irqs -= 1;
-               }
-       }
-       spin_unlock_irq(&irq_controller_lock);
-
-       return irqs;
-}
-
-EXPORT_SYMBOL(probe_irq_on);
-
-unsigned int probe_irq_mask(unsigned long irqs)
-{
-       unsigned int mask = 0, i;
-
-       spin_lock_irq(&irq_controller_lock);
-       for (i = 0; i < 16 && i < NR_IRQS; i++)
-               if (irq_desc[i].probing && irq_desc[i].triggered)
-                       mask |= 1 << i;
-       spin_unlock_irq(&irq_controller_lock);
-
-       up(&probe_sem);
-
-       return mask;
-}
-EXPORT_SYMBOL(probe_irq_mask);
-
-/*
- * Possible return values:
- *  >= 0 - interrupt number
- *    -1 - no interrupt/many interrupts
- */
-int probe_irq_off(unsigned long irqs)
-{
-       unsigned int i;
-       int irq_found = NO_IRQ;
-
-       /*
-        * look at the interrupts, and find exactly one
-        * that we were probing has been triggered
-        */
-       spin_lock_irq(&irq_controller_lock);
-       for (i = 0; i < NR_IRQS; i++) {
-               if (irq_desc[i].probing &&
-                   irq_desc[i].triggered) {
-                       if (irq_found != NO_IRQ) {
-                               irq_found = NO_IRQ;
-                               goto out;
-                       }
-                       irq_found = i;
-               }
-       }
-
-       if (irq_found == -1)
-               irq_found = NO_IRQ;
-out:
-       spin_unlock_irq(&irq_controller_lock);
-
-       up(&probe_sem);
-
-       return irq_found;
-}
-
-EXPORT_SYMBOL(probe_irq_off);
-
-#ifdef CONFIG_SMP
-static void route_irq(struct irqdesc *desc, unsigned int irq, unsigned int cpu)
-{
-       pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->cpu, cpu);
-
-       spin_lock_irq(&irq_controller_lock);
-       desc->cpu = cpu;
-       desc->chip->set_cpu(desc, irq, cpu);
-       spin_unlock_irq(&irq_controller_lock);
-}
-
-#ifdef CONFIG_PROC_FS
-static int
-irq_affinity_read_proc(char *page, char **start, off_t off, int count,
-                      int *eof, void *data)
-{
-       struct irqdesc *desc = irq_desc + ((int)data);
-       int len = cpumask_scnprintf(page, count, desc->affinity);
-
-       if (count - len < 2)
-               return -EINVAL;
-       page[len++] = '\n';
-       page[len] = '\0';
-
-       return len;
-}
-
-static int
-irq_affinity_write_proc(struct file *file, const char __user *buffer,
-                       unsigned long count, void *data)
-{
-       unsigned int irq = (unsigned int)data;
-       struct irqdesc *desc = irq_desc + irq;
-       cpumask_t affinity, tmp;
-       int ret = -EIO;
-
-       if (!desc->chip->set_cpu)
-               goto out;
-
-       ret = cpumask_parse(buffer, count, affinity);
-       if (ret)
-               goto out;
-
-       cpus_and(tmp, affinity, cpu_online_map);
-       if (cpus_empty(tmp)) {
-               ret = -EINVAL;
-               goto out;
-       }
-
-       desc->affinity = affinity;
-       route_irq(desc, irq, first_cpu(tmp));
-       ret = count;
-
- out:
-       return ret;
-}
-#endif
-#endif
-
-void __init init_irq_proc(void)
-{
-#if defined(CONFIG_SMP) && defined(CONFIG_PROC_FS)
-       struct proc_dir_entry *dir;
-       int irq;
-
-       dir = proc_mkdir("irq", NULL);
-       if (!dir)
-               return;
-
-       for (irq = 0; irq < NR_IRQS; irq++) {
-               struct proc_dir_entry *entry;
-               struct irqdesc *desc;
-               char name[16];
-
-               desc = irq_desc + irq;
-               memset(name, 0, sizeof(name));
-               snprintf(name, sizeof(name) - 1, "%u", irq);
-
-               desc->procdir = proc_mkdir(name, dir);
-               if (!desc->procdir)
-                       continue;
-
-               entry = create_proc_entry("smp_affinity", 0600, desc->procdir);
-               if (entry) {
-                       entry->nlink = 1;
-                       entry->data = (void *)irq;
-                       entry->read_proc = irq_affinity_read_proc;
-                       entry->write_proc = irq_affinity_write_proc;
-               }
-       }
-#endif
+       spin_lock_irqsave(&desc->lock, flags);
+       desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
+       if (iflags & IRQF_VALID)
+               desc->status &= ~IRQ_NOREQUEST;
+       if (iflags & IRQF_PROBE)
+               desc->status &= ~IRQ_NOPROBE;
+       if (!(iflags & IRQF_NOAUTOEN))
+               desc->status &= ~IRQ_NOAUTOEN;
+       spin_unlock_irqrestore(&desc->lock, flags);
 }
 
 void __init init_IRQ(void)
 {
-       struct irqdesc *desc;
        int irq;
 
+       for (irq = 0; irq < NR_IRQS; irq++)
+               irq_desc[irq].status |= IRQ_NOREQUEST | IRQ_NOPROBE;
+
 #ifdef CONFIG_SMP
-       bad_irq_desc.affinity = CPU_MASK_ALL;
+       cpumask_setall(bad_irq_desc.affinity);
        bad_irq_desc.cpu = smp_processor_id();
 #endif
-
-       for (irq = 0, desc = irq_desc; irq < NR_IRQS; irq++, desc++) {
-               *desc = bad_irq_desc;
-               INIT_LIST_HEAD(&desc->pend);
-       }
-
        init_arch_irq();
 }
 
-static int __init noirqdebug_setup(char *str)
+#ifdef CONFIG_HOTPLUG_CPU
+
+static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu)
 {
-       noirqdebug = 1;
-       return 1;
-}
+       pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->cpu, cpu);
 
-__setup("noirqdebug", noirqdebug_setup);
+       spin_lock_irq(&desc->lock);
+       desc->chip->set_affinity(irq, cpumask_of(cpu));
+       spin_unlock_irq(&desc->lock);
+}
 
-#ifdef CONFIG_HOTPLUG_CPU
 /*
  * The CPU has been marked offline.  Migrate IRQs off this CPU.  If
  * the affinity settings do not allow other CPUs, force them onto any
@@ -1077,18 +193,19 @@ void migrate_irqs(void)
        unsigned int i, cpu = smp_processor_id();
 
        for (i = 0; i < NR_IRQS; i++) {
-               struct irqdesc *desc = irq_desc + i;
+               struct irq_desc *desc = irq_desc + i;
 
                if (desc->cpu == cpu) {
-                       unsigned int newcpu = any_online_cpu(desc->affinity);
-
-                       if (newcpu == NR_CPUS) {
+                       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",
                                               i, cpu);
 
-                               cpus_setall(desc->affinity);
-                               newcpu = any_online_cpu(desc->affinity);
+                               cpumask_setall(desc->affinity);
+                               newcpu = cpumask_any_and(desc->affinity,
+                                                        cpu_online_mask);
                        }
 
                        route_irq(desc, i, newcpu);