X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=kernel%2Firq%2Fmanage.c;h=5597c157442a19a5e5bbe7de068d86c261e98951;hb=92320cec611d4ed44a9bd635727d61f6caa669a7;hp=9ea18879fb62bffa24cebe16b09bb9d52ad57e97;hpb=94d39e1f6e8132ea982a1d61acbe0423d3d14365;p=powerpc.git diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 9ea18879fb..5597c15744 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 #include #include #include @@ -38,6 +38,46 @@ void synchronize_irq(unsigned int irq) } EXPORT_SYMBOL(synchronize_irq); +/** + * irq_can_set_affinity - Check if the affinity of a given irq can be set + * @irq: Interrupt to check + * + */ +int irq_can_set_affinity(unsigned int irq) +{ + struct irq_desc *desc = irq_desc + irq; + + if (CHECK_IRQ_PER_CPU(desc->status) || !desc->chip || + !desc->chip->set_affinity) + return 0; + + return 1; +} + +/** + * irq_set_affinity - Set the irq affinity of a given irq + * @irq: Interrupt to set affinity + * @cpumask: cpumask + * + */ +int irq_set_affinity(unsigned int irq, cpumask_t cpumask) +{ + struct irq_desc *desc = irq_desc + irq; + + if (!desc->chip->set_affinity) + return -EINVAL; + + set_balance_irq_affinity(irq, cpumask); + +#ifdef CONFIG_GENERIC_PENDING_IRQ + set_pending_irq(irq, cpumask); +#else + desc->affinity = cpumask; + desc->chip->set_affinity(irq, cpumask); +#endif + return 0; +} + #endif /** @@ -114,7 +154,7 @@ void enable_irq(unsigned int irq) spin_lock_irqsave(&desc->lock, flags); switch (desc->depth) { case 0: - printk(KERN_WARNING "Unablanced enable_irq(%d)\n", irq); + printk(KERN_WARNING "Unbalanced enable for IRQ %d\n", irq); WARN_ON(1); break; case 1: { @@ -132,6 +172,51 @@ void enable_irq(unsigned int irq) } 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 @@ -146,12 +231,23 @@ int can_request_irq(unsigned int irq, unsigned long irqflags) 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. @@ -160,20 +256,21 @@ int setup_irq(unsigned int irq, struct irqaction *new) { struct irq_desc *desc = irq_desc + irq; struct irqaction *old, **p; + const char *old_name = NULL; unsigned long flags; int shared = 0; if (irq >= NR_IRQS) return -EINVAL; - if (desc->chip == &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. @@ -192,13 +289,22 @@ int setup_irq(unsigned int irq, struct irqaction *new) p = &desc->action; old = *p; if (old) { - /* Can't share interrupts unless both agree to */ - if (!(old->flags & new->flags & SA_SHIRQ)) + /* + * 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)) { + old_name = old->name; goto mismatch; + } -#if defined(CONFIG_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 @@ -211,11 +317,34 @@ int setup_irq(unsigned int irq, struct irqaction *new) } *p = new; -#if defined(CONFIG_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 + /* Exclude IRQ from balancing */ + if (new->flags & IRQF_NOBALANCING) + desc->status |= IRQ_NO_BALANCING; + if (!shared) { + 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); @@ -226,8 +355,13 @@ int setup_irq(unsigned int irq, struct irqaction *new) desc->chip->startup(irq); else desc->chip->enable(irq); - } + } else + /* Undo nested disables: */ + desc->depth = 1; } + /* Reset broken irq detection when installing new handler */ + desc->irq_count = 0; + desc->irqs_unhandled = 0; spin_unlock_irqrestore(&desc->lock, flags); new->irq = irq; @@ -238,11 +372,15 @@ int setup_irq(unsigned int irq, struct irqaction *new) return 0; mismatch: - spin_unlock_irqrestore(&desc->lock, flags); - if (!(new->flags & SA_PROBEIRQ)) { - printk(KERN_ERR "%s: irq handler mismatch\n", __FUNCTION__); +#ifdef CONFIG_DEBUG_SHIRQ + if (!(new->flags & IRQF_PROBE_SHARED)) { + printk(KERN_ERR "IRQ handler type mismatch for IRQ %d\n", irq); + if (old_name) + printk(KERN_ERR "current handler: %s\n", old_name); dump_stack(); } +#endif + spin_unlock_irqrestore(&desc->lock, flags); return -EBUSY; } @@ -265,6 +403,7 @@ void free_irq(unsigned int irq, void *dev_id) struct irq_desc *desc; struct irqaction **p; unsigned long flags; + irqreturn_t (*handler)(int, void *) = NULL; WARN_ON(in_interrupt()); if (irq >= NR_IRQS) @@ -304,13 +443,26 @@ void free_irq(unsigned int irq, void *dev_id) /* Make sure it's not being used on another CPU */ synchronize_irq(irq); + if (action->flags & IRQF_SHARED) + handler = action->handler; kfree(action); return; } - printk(KERN_ERR "Trying to free free IRQ%d\n", irq); + printk(KERN_ERR "Trying to free already-free IRQ %d\n", irq); spin_unlock_irqrestore(&desc->lock, flags); return; } +#ifdef CONFIG_DEBUG_SHIRQ + if (handler) { + /* + * It's a shared IRQ -- the driver ought to be prepared for it + * to happen even now it's being freed, so let's make sure.... + * We do this after actually deregistering it, to make sure that + * a 'real' IRQ doesn't run in parallel with our fake + */ + handler(irq, dev_id); + } +#endif } EXPORT_SYMBOL(free_irq); @@ -338,25 +490,30 @@ 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 *), +int request_irq(unsigned int irq, irq_handler_t handler, unsigned long irqflags, const char *devname, void *dev_id) { struct irqaction *action; int retval; +#ifdef CONFIG_LOCKDEP + /* + * Lockdep wants atomic interrupt handlers: + */ + irqflags |= IRQF_DISABLED; +#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; @@ -378,6 +535,25 @@ int request_irq(unsigned int irq, select_smp_affinity(irq); +#ifdef CONFIG_DEBUG_SHIRQ + if (irqflags & IRQF_SHARED) { + /* + * It's a shared IRQ -- the driver ought to be prepared for it + * to happen immediately, so let's make sure.... + * We do this before actually registering it, to make sure that + * a 'real' IRQ doesn't run in parallel with our fake + */ + if (irqflags & IRQF_DISABLED) { + unsigned long flags; + + local_irq_save(flags); + handler(irq, dev_id); + local_irq_restore(flags); + } else + handler(irq, dev_id); + } +#endif + retval = setup_irq(irq, action); if (retval) kfree(action); @@ -385,4 +561,3 @@ int request_irq(unsigned int irq, return retval; } EXPORT_SYMBOL(request_irq); -