mirror of https://gitee.com/openkylin/linux.git
313 lines
7.0 KiB
C
313 lines
7.0 KiB
C
/*
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* linux/kernel/irq/spurious.c
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*
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* Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
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*
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* This file contains spurious interrupt handling.
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*/
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#include <linux/jiffies.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/interrupt.h>
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#include <linux/moduleparam.h>
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#include <linux/timer.h>
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static int irqfixup __read_mostly;
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#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
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static void poll_spurious_irqs(unsigned long dummy);
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static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs, 0, 0);
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/*
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* Recovery handler for misrouted interrupts.
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*/
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static int try_one_irq(int irq, struct irq_desc *desc)
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{
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struct irqaction *action;
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int ok = 0, work = 0;
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spin_lock(&desc->lock);
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/* Already running on another processor */
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if (desc->status & IRQ_INPROGRESS) {
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/*
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* Already running: If it is shared get the other
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* CPU to go looking for our mystery interrupt too
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*/
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if (desc->action && (desc->action->flags & IRQF_SHARED))
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desc->status |= IRQ_PENDING;
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spin_unlock(&desc->lock);
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return ok;
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}
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/* Honour the normal IRQ locking */
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desc->status |= IRQ_INPROGRESS;
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action = desc->action;
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spin_unlock(&desc->lock);
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while (action) {
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/* Only shared IRQ handlers are safe to call */
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if (action->flags & IRQF_SHARED) {
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if (action->handler(irq, action->dev_id) ==
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IRQ_HANDLED)
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ok = 1;
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}
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action = action->next;
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}
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local_irq_disable();
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/* Now clean up the flags */
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spin_lock(&desc->lock);
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action = desc->action;
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/*
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* While we were looking for a fixup someone queued a real
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* IRQ clashing with our walk:
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*/
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while ((desc->status & IRQ_PENDING) && action) {
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/*
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* Perform real IRQ processing for the IRQ we deferred
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*/
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work = 1;
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spin_unlock(&desc->lock);
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handle_IRQ_event(irq, action);
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spin_lock(&desc->lock);
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desc->status &= ~IRQ_PENDING;
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}
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desc->status &= ~IRQ_INPROGRESS;
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/*
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* If we did actual work for the real IRQ line we must let the
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* IRQ controller clean up too
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*/
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if (work && desc->chip && desc->chip->end)
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desc->chip->end(irq);
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spin_unlock(&desc->lock);
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return ok;
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}
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static int misrouted_irq(int irq)
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{
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struct irq_desc *desc;
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int i, ok = 0;
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for_each_irq_desc(i, desc) {
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if (!i)
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continue;
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if (i == irq) /* Already tried */
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continue;
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if (try_one_irq(i, desc))
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ok = 1;
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}
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/* So the caller can adjust the irq error counts */
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return ok;
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}
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static void poll_all_shared_irqs(void)
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{
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struct irq_desc *desc;
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int i;
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for_each_irq_desc(i, desc) {
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unsigned int status;
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if (!i)
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continue;
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/* Racy but it doesn't matter */
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status = desc->status;
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barrier();
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if (!(status & IRQ_SPURIOUS_DISABLED))
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continue;
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try_one_irq(i, desc);
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}
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}
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static void poll_spurious_irqs(unsigned long dummy)
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{
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poll_all_shared_irqs();
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mod_timer(&poll_spurious_irq_timer,
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jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
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}
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#ifdef CONFIG_DEBUG_SHIRQ
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void debug_poll_all_shared_irqs(void)
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{
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poll_all_shared_irqs();
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}
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#endif
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/*
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* If 99,900 of the previous 100,000 interrupts have not been handled
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* then assume that the IRQ is stuck in some manner. Drop a diagnostic
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* and try to turn the IRQ off.
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*
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* (The other 100-of-100,000 interrupts may have been a correctly
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* functioning device sharing an IRQ with the failing one)
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*
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* Called under desc->lock
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*/
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static void
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__report_bad_irq(unsigned int irq, struct irq_desc *desc,
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irqreturn_t action_ret)
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{
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struct irqaction *action;
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if (action_ret != IRQ_HANDLED && action_ret != IRQ_NONE) {
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printk(KERN_ERR "irq event %d: bogus return value %x\n",
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irq, action_ret);
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} else {
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printk(KERN_ERR "irq %d: nobody cared (try booting with "
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"the \"irqpoll\" option)\n", irq);
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}
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dump_stack();
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printk(KERN_ERR "handlers:\n");
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action = desc->action;
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while (action) {
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printk(KERN_ERR "[<%p>]", action->handler);
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print_symbol(" (%s)",
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(unsigned long)action->handler);
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printk("\n");
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action = action->next;
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}
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}
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static void
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report_bad_irq(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret)
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{
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static int count = 100;
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if (count > 0) {
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count--;
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__report_bad_irq(irq, desc, action_ret);
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}
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}
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static inline int
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try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
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irqreturn_t action_ret)
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{
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struct irqaction *action;
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if (!irqfixup)
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return 0;
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/* We didn't actually handle the IRQ - see if it was misrouted? */
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if (action_ret == IRQ_NONE)
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return 1;
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/*
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* But for 'irqfixup == 2' we also do it for handled interrupts if
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* they are marked as IRQF_IRQPOLL (or for irq zero, which is the
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* traditional PC timer interrupt.. Legacy)
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*/
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if (irqfixup < 2)
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return 0;
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if (!irq)
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return 1;
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/*
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* Since we don't get the descriptor lock, "action" can
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* change under us. We don't really care, but we don't
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* want to follow a NULL pointer. So tell the compiler to
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* just load it once by using a barrier.
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*/
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action = desc->action;
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barrier();
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return action && (action->flags & IRQF_IRQPOLL);
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}
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void note_interrupt(unsigned int irq, struct irq_desc *desc,
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irqreturn_t action_ret)
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{
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if (unlikely(action_ret != IRQ_HANDLED)) {
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/*
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* If we are seeing only the odd spurious IRQ caused by
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* bus asynchronicity then don't eventually trigger an error,
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* otherwise the couter becomes a doomsday timer for otherwise
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* working systems
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*/
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if (time_after(jiffies, desc->last_unhandled + HZ/10))
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desc->irqs_unhandled = 1;
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else
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desc->irqs_unhandled++;
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desc->last_unhandled = jiffies;
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if (unlikely(action_ret != IRQ_NONE))
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report_bad_irq(irq, desc, action_ret);
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}
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if (unlikely(try_misrouted_irq(irq, desc, action_ret))) {
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int ok = misrouted_irq(irq);
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if (action_ret == IRQ_NONE)
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desc->irqs_unhandled -= ok;
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}
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desc->irq_count++;
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if (likely(desc->irq_count < 100000))
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return;
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desc->irq_count = 0;
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if (unlikely(desc->irqs_unhandled > 99900)) {
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/*
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* The interrupt is stuck
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*/
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__report_bad_irq(irq, desc, action_ret);
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/*
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* Now kill the IRQ
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*/
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printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
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desc->status |= IRQ_DISABLED | IRQ_SPURIOUS_DISABLED;
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desc->depth++;
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desc->chip->disable(irq);
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mod_timer(&poll_spurious_irq_timer,
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jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
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}
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desc->irqs_unhandled = 0;
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}
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int noirqdebug __read_mostly;
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int noirqdebug_setup(char *str)
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{
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noirqdebug = 1;
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printk(KERN_INFO "IRQ lockup detection disabled\n");
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return 1;
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}
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__setup("noirqdebug", noirqdebug_setup);
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module_param(noirqdebug, bool, 0644);
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MODULE_PARM_DESC(noirqdebug, "Disable irq lockup detection when true");
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static int __init irqfixup_setup(char *str)
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{
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irqfixup = 1;
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printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
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printk(KERN_WARNING "This may impact system performance.\n");
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return 1;
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}
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__setup("irqfixup", irqfixup_setup);
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module_param(irqfixup, int, 0644);
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MODULE_PARM_DESC("irqfixup", "0: No fixup, 1: irqfixup mode, 2: irqpoll mode");
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static int __init irqpoll_setup(char *str)
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{
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irqfixup = 2;
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printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
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"enabled\n");
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printk(KERN_WARNING "This may significantly impact system "
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"performance\n");
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return 1;
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}
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__setup("irqpoll", irqpoll_setup);
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