/proc/interrupts

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cat /proc/interrupts

读取到的内容从左到右，分别为：1、逻辑中断号，2、中断在各CPU发生的次数，3、中断所属设备类名称，4、硬件中断号，5、中断处理函数。

如下图：

代码实现分析如下红色字体1～ 5 .

489  int show_interrupts(struct seq_file *p, void *v)490  {491  static int prec;492  493  unsigned long flags, any_count = 0;494  int i = *(loff_t *) v, j;495  struct irqaction *action;496  struct irq_desc *desc;497  498  if (i > ACTUAL_NR_IRQS)499  return 0;500  501  if (i == ACTUAL_NR_IRQS)502  return arch_show_interrupts(p, prec);503 504  /* print header and calculate the width of the first column */   505  if (i == 0) {506  for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)507  j *= 10;508  509  seq_printf(p, "%*s", prec + 8, "");510  for_each_online_cpu(j)511  seq_printf(p, "CPU%-8d", j);512  seq_putc(p, '\n');513  }514  515  irq_lock_sparse();516  desc = irq_to_desc(i);517  if (!desc)518  goto outsparse;519  520  raw_spin_lock_irqsave(&desc->lock, flags);521  for_each_online_cpu(j)522  any_count |= kstat_irqs_cpu(i, j);523  action = desc->action;524  if (!action && !any_count)525  goto out;526  527  seq_printf(p, "%*d: ", prec, i);     //1、打印逻辑中断号528  for_each_online_cpu(j)529  seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));    //2、打印中断次数530  531  if (desc->irq_data.chip) {532  if (desc->irq_data.chip->irq_print_chip)533  desc->irq_data.chip->irq_print_chip(&desc->irq_data, p);534  else if (desc->irq_data.chip->name)535  seq_printf(p, " %8s", desc->irq_data.chip->name);   //3、打印中断名称536  else537  seq_printf(p, " %8s", "-");538  } else {539  seq_printf(p, " %8s", "None");540  }541  if (desc->irq_data.domain)542  seq_printf(p, " %*d", prec, (int) desc->irq_data.hwirq);        //4、打印硬件中断号，比如，gpio number 543  #ifdef CONFIG_GENERIC_IRQ_SHOW_LEVEL544  seq_printf(p, " %-8s", irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");  //打印中断触发类型545  #endif546  if (desc->name)547  seq_printf(p, "-%-8s", desc->name);548  549  if (action) {550  seq_printf(p, "  %s", action->name);551  while ((action = action->next) != NULL)552  seq_printf(p, ", %s", action->name);    //5、打印中断处理函数名称553  }554  555  seq_putc(p, '\n');556  out:557  raw_spin_unlock_irqrestore(&desc->lock, flags);558  outsparse:559  irq_unlock_sparse();560  return 0;561  }562

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