diff options
Diffstat (limited to 'kernel/irq/manage.c')
| -rw-r--r-- | kernel/irq/manage.c | 89 |
1 files changed, 59 insertions, 30 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 704e488730a..3164ba7ce15 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -138,6 +138,22 @@ int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) return 0; } +int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) + return -EINVAL; + + raw_spin_lock_irqsave(&desc->lock, flags); + desc->affinity_hint = m; + raw_spin_unlock_irqrestore(&desc->lock, flags); + + return 0; +} +EXPORT_SYMBOL_GPL(irq_set_affinity_hint); + #ifndef CONFIG_AUTO_IRQ_AFFINITY /* * Generic version of the affinity autoselector. @@ -757,16 +773,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) if (new->flags & IRQF_ONESHOT) desc->status |= IRQ_ONESHOT; - /* - * Force MSI interrupts to run with interrupts - * disabled. The multi vector cards can cause stack - * overflows due to nested interrupts when enough of - * them are directed to a core and fire at the same - * time. - */ - if (desc->msi_desc) - new->flags |= IRQF_DISABLED; - if (!(desc->status & IRQ_NOAUTOEN)) { desc->depth = 0; desc->status &= ~IRQ_DISABLED; @@ -916,6 +922,12 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id) desc->chip->disable(irq); } +#ifdef CONFIG_SMP + /* make sure affinity_hint is cleaned up */ + if (WARN_ON_ONCE(desc->affinity_hint)) + desc->affinity_hint = NULL; +#endif + raw_spin_unlock_irqrestore(&desc->lock, flags); unregister_handler_proc(irq, action); @@ -1027,7 +1039,6 @@ EXPORT_SYMBOL(free_irq); * Flags: * * IRQF_SHARED Interrupt is shared - * IRQF_DISABLED Disable local interrupts while processing * IRQF_SAMPLE_RANDOM The interrupt can be used for entropy * IRQF_TRIGGER_* Specify active edge(s) or level * @@ -1041,25 +1052,6 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler, int retval; /* - * handle_IRQ_event() always ignores IRQF_DISABLED except for - * the _first_ irqaction (sigh). That can cause oopsing, but - * the behavior is classified as "will not fix" so we need to - * start nudging drivers away from using that idiom. - */ - if ((irqflags & (IRQF_SHARED|IRQF_DISABLED)) == - (IRQF_SHARED|IRQF_DISABLED)) { - pr_warning( - "IRQ %d/%s: IRQF_DISABLED is not guaranteed on shared IRQs\n", - irq, devname); - } - -#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 @@ -1120,3 +1112,40 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler, return retval; } EXPORT_SYMBOL(request_threaded_irq); + +/** + * request_any_context_irq - allocate an interrupt line + * @irq: Interrupt line to allocate + * @handler: Function to be called when the IRQ occurs. + * Threaded handler for threaded interrupts. + * @flags: Interrupt type flags + * @name: 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. It selects either a + * hardirq or threaded handling method depending on the + * context. + * + * On failure, it returns a negative value. On success, + * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED. + */ +int request_any_context_irq(unsigned int irq, irq_handler_t handler, + unsigned long flags, const char *name, void *dev_id) +{ + struct irq_desc *desc = irq_to_desc(irq); + int ret; + + if (!desc) + return -EINVAL; + + if (desc->status & IRQ_NESTED_THREAD) { + ret = request_threaded_irq(irq, NULL, handler, + flags, name, dev_id); + return !ret ? IRQC_IS_NESTED : ret; + } + + ret = request_irq(irq, handler, flags, name, dev_id); + return !ret ? IRQC_IS_HARDIRQ : ret; +} +EXPORT_SYMBOL_GPL(request_any_context_irq); |