diff options
Diffstat (limited to 'linux-2.6-xen-sparse/kernel/irq/spurious.c')
| -rw-r--r-- | linux-2.6-xen-sparse/kernel/irq/spurious.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/linux-2.6-xen-sparse/kernel/irq/spurious.c b/linux-2.6-xen-sparse/kernel/irq/spurious.c deleted file mode 100644 index 9ff0259c10..0000000000 --- a/linux-2.6-xen-sparse/kernel/irq/spurious.c +++ /dev/null @@ -1,211 +0,0 @@ -/* - * linux/kernel/irq/spurious.c - * - * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar - * - * This file contains spurious interrupt handling. - */ - -#include <linux/irq.h> -#include <linux/module.h> -#include <linux/kallsyms.h> -#include <linux/interrupt.h> - -static int irqfixup __read_mostly; - -/* - * Recovery handler for misrouted interrupts. - */ -static int misrouted_irq(int irq, struct pt_regs *regs) -{ - int i; - int ok = 0; - int work = 0; /* Did we do work for a real IRQ */ - - for (i = 1; i < NR_IRQS; i++) { - struct irq_desc *desc = irq_desc + i; - struct irqaction *action; - - if (i == irq) /* Already tried */ - continue; - - spin_lock(&desc->lock); - /* Already running on another processor */ - if (desc->status & IRQ_INPROGRESS) { - /* - * Already running: If it is shared get the other - * CPU to go looking for our mystery interrupt too - */ - if (desc->action && (desc->action->flags & IRQF_SHARED)) - desc->status |= IRQ_PENDING; - spin_unlock(&desc->lock); - continue; - } - /* Honour the normal IRQ locking */ - desc->status |= IRQ_INPROGRESS; - action = desc->action; - spin_unlock(&desc->lock); - - while (action) { - /* Only shared IRQ handlers are safe to call */ - if (action->flags & IRQF_SHARED) { - if (action->handler(i, action->dev_id, regs) == - IRQ_HANDLED) - ok = 1; - } - action = action->next; - } - local_irq_disable(); - /* Now clean up the flags */ - spin_lock(&desc->lock); - action = desc->action; - - /* - * While we were looking for a fixup someone queued a real - * IRQ clashing with our walk: - */ - while ((desc->status & IRQ_PENDING) && action) { - /* - * Perform real IRQ processing for the IRQ we deferred - */ - work = 1; - spin_unlock(&desc->lock); - handle_IRQ_event(i, regs, action); - spin_lock(&desc->lock); - desc->status &= ~IRQ_PENDING; - } - desc->status &= ~IRQ_INPROGRESS; - /* - * If we did actual work for the real IRQ line we must let the - * IRQ controller clean up too - */ - if (work && desc->chip && desc->chip->end) - desc->chip->end(i); - spin_unlock(&desc->lock); - } - /* So the caller can adjust the irq error counts */ - return ok; -} - -/* - * If 99,900 of the previous 100,000 interrupts have not been handled - * then assume that the IRQ is stuck in some manner. Drop a diagnostic - * and try to turn the IRQ off. - * - * (The other 100-of-100,000 interrupts may have been a correctly - * functioning device sharing an IRQ with the failing one) - * - * Called under desc->lock - */ - -static void -__report_bad_irq(unsigned int irq, struct irq_desc *desc, - irqreturn_t action_ret) -{ - struct irqaction *action; - - if (action_ret != IRQ_HANDLED && action_ret != IRQ_NONE) { - printk(KERN_ERR "irq event %d: bogus return value %x\n", - irq, action_ret); - } else { - printk(KERN_ERR "irq %d: nobody cared (try booting with " - "the \"irqpoll\" option)\n", irq); - } - dump_stack(); - printk(KERN_ERR "handlers:\n"); - - action = desc->action; - while (action) { - printk(KERN_ERR "[<%p>]", action->handler); - print_symbol(" (%s)", - (unsigned long)action->handler); - printk("\n"); - action = action->next; - } -} - -static void -report_bad_irq(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret) -{ - static int count = 100; - - if (count > 0) { - count--; - __report_bad_irq(irq, desc, action_ret); - } -} - -void note_interrupt(unsigned int irq, struct irq_desc *desc, - irqreturn_t action_ret, struct pt_regs *regs) -{ - if (unlikely(action_ret != IRQ_HANDLED)) { - if (!irq_ignore_unhandled(irq)) - desc->irqs_unhandled++; - if (unlikely(action_ret != IRQ_NONE)) - report_bad_irq(irq, desc, action_ret); - } - - if (unlikely(irqfixup)) { - /* Don't punish working computers */ - if ((irqfixup == 2 && irq == 0) || action_ret == IRQ_NONE) { - int ok = misrouted_irq(irq, regs); - if (action_ret == IRQ_NONE) - desc->irqs_unhandled -= ok; - } - } - - desc->irq_count++; - if (likely(desc->irq_count < 100000)) - return; - - desc->irq_count = 0; - if (unlikely(desc->irqs_unhandled > 99900)) { - /* - * The interrupt is stuck - */ - __report_bad_irq(irq, desc, action_ret); - /* - * Now kill the IRQ - */ - printk(KERN_EMERG "Disabling IRQ #%d\n", irq); - desc->status |= IRQ_DISABLED; - desc->depth = 1; - desc->chip->disable(irq); - } - desc->irqs_unhandled = 0; -} - -int noirqdebug __read_mostly; - -int __init noirqdebug_setup(char *str) -{ - noirqdebug = 1; - printk(KERN_INFO "IRQ lockup detection disabled\n"); - - return 1; -} - -__setup("noirqdebug", noirqdebug_setup); - -static int __init irqfixup_setup(char *str) -{ - irqfixup = 1; - printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n"); - printk(KERN_WARNING "This may impact system performance.\n"); - - return 1; -} - -__setup("irqfixup", irqfixup_setup); - -static int __init irqpoll_setup(char *str) -{ - irqfixup = 2; - printk(KERN_WARNING "Misrouted IRQ fixup and polling support " - "enabled\n"); - printk(KERN_WARNING "This may significantly impact system " - "performance\n"); - return 1; -} - -__setup("irqpoll", irqpoll_setup); |