Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/irq/spurious.c |
| 3 | * |
| 4 | * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar |
| 5 | * |
| 6 | * This file contains spurious interrupt handling. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/irq.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/kallsyms.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | |
| 14 | /* |
| 15 | * If 99,900 of the previous 100,000 interrupts have not been handled |
| 16 | * then assume that the IRQ is stuck in some manner. Drop a diagnostic |
| 17 | * and try to turn the IRQ off. |
| 18 | * |
| 19 | * (The other 100-of-100,000 interrupts may have been a correctly |
| 20 | * functioning device sharing an IRQ with the failing one) |
| 21 | * |
| 22 | * Called under desc->lock |
| 23 | */ |
| 24 | |
| 25 | static void |
| 26 | __report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret) |
| 27 | { |
| 28 | struct irqaction *action; |
| 29 | |
| 30 | if (action_ret != IRQ_HANDLED && action_ret != IRQ_NONE) { |
| 31 | printk(KERN_ERR "irq event %d: bogus return value %x\n", |
| 32 | irq, action_ret); |
| 33 | } else { |
| 34 | printk(KERN_ERR "irq %d: nobody cared!\n", irq); |
| 35 | } |
| 36 | dump_stack(); |
| 37 | printk(KERN_ERR "handlers:\n"); |
| 38 | action = desc->action; |
| 39 | while (action) { |
| 40 | printk(KERN_ERR "[<%p>]", action->handler); |
| 41 | print_symbol(" (%s)", |
| 42 | (unsigned long)action->handler); |
| 43 | printk("\n"); |
| 44 | action = action->next; |
| 45 | } |
| 46 | } |
| 47 | |
Adrian Bunk | 52c1da3 | 2005-06-23 22:05:33 -0700 | [diff] [blame] | 48 | static void report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
| 50 | static int count = 100; |
| 51 | |
| 52 | if (count > 0) { |
| 53 | count--; |
| 54 | __report_bad_irq(irq, desc, action_ret); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | void note_interrupt(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret) |
| 59 | { |
| 60 | if (action_ret != IRQ_HANDLED) { |
| 61 | desc->irqs_unhandled++; |
| 62 | if (action_ret != IRQ_NONE) |
| 63 | report_bad_irq(irq, desc, action_ret); |
| 64 | } |
| 65 | |
| 66 | desc->irq_count++; |
| 67 | if (desc->irq_count < 100000) |
| 68 | return; |
| 69 | |
| 70 | desc->irq_count = 0; |
| 71 | if (desc->irqs_unhandled > 99900) { |
| 72 | /* |
| 73 | * The interrupt is stuck |
| 74 | */ |
| 75 | __report_bad_irq(irq, desc, action_ret); |
| 76 | /* |
| 77 | * Now kill the IRQ |
| 78 | */ |
| 79 | printk(KERN_EMERG "Disabling IRQ #%d\n", irq); |
| 80 | desc->status |= IRQ_DISABLED; |
| 81 | desc->handler->disable(irq); |
| 82 | } |
| 83 | desc->irqs_unhandled = 0; |
| 84 | } |
| 85 | |
| 86 | int noirqdebug; |
| 87 | |
| 88 | int __init noirqdebug_setup(char *str) |
| 89 | { |
| 90 | noirqdebug = 1; |
| 91 | printk(KERN_INFO "IRQ lockup detection disabled\n"); |
| 92 | return 1; |
| 93 | } |
| 94 | |
| 95 | __setup("noirqdebug", noirqdebug_setup); |
| 96 | |