void note_interrupt(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret) { if (unlikely(action_ret != IRQ_HANDLED)) { desc->irqs_unhandled++; if (unlikely(action_ret != IRQ_NONE)) report_bad_irq(irq, desc, action_ret); } if (unlikely(try_misrouted_irq(irq, desc, action_ret))) { int ok = misrouted_irq(irq); 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; }
void note_interrupt(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret) { if (desc->istate & IRQS_POLL_INPROGRESS) return; /* we get here again via the threaded handler */ if (action_ret == IRQ_WAKE_THREAD) return; if (bad_action_ret(action_ret)) { report_bad_irq(irq, desc, action_ret); return; } if (unlikely(action_ret == IRQ_NONE)) { /* * If we are seeing only the odd spurious IRQ caused by * bus asynchronicity then don't eventually trigger an error, * otherwise the counter becomes a doomsday timer for otherwise * working systems */ if (time_after(jiffies, desc->last_unhandled + HZ/10)) desc->irqs_unhandled = 1; else desc->irqs_unhandled++; desc->last_unhandled = jiffies; } if (unlikely(try_misrouted_irq(irq, desc, action_ret))) { int ok = misrouted_irq(irq); 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 "[K] Disabling IRQ #%d\n", irq); desc->istate |= IRQS_SPURIOUS_DISABLED; desc->depth++; irq_disable(desc); mod_timer(&poll_spurious_irq_timer, jiffies + POLL_SPURIOUS_IRQ_INTERVAL); } desc->irqs_unhandled = 0; }
void note_interrupt(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret) { if (desc->istate & IRQS_POLL_INPROGRESS) return; if (bad_action_ret(action_ret)) { report_bad_irq(irq, desc, action_ret); return; } /* * We cannot call note_interrupt from the threaded handler * because we need to look at the compound of all handlers * (primary and threaded). Aside of that in the threaded * shared case we have no serialization against an incoming * hardware interrupt while we are dealing with a threaded * result. * * So in case a thread is woken, we just note the fact and * defer the analysis to the next hardware interrupt. * * The threaded handlers store whether they sucessfully * handled an interrupt and we check whether that number * changed versus the last invocation. * * We could handle all interrupts with the delayed by one * mechanism, but for the non forced threaded case we'd just * add pointless overhead to the straight hardirq interrupts * for the sake of a few lines less code. */ if (action_ret & IRQ_WAKE_THREAD) { /* * There is a thread woken. Check whether one of the * shared primary handlers returned IRQ_HANDLED. If * not we defer the spurious detection to the next * interrupt. */ if (action_ret == IRQ_WAKE_THREAD) { int handled; /* * We use bit 31 of thread_handled_last to * denote the deferred spurious detection * active. No locking necessary as * thread_handled_last is only accessed here * and we have the guarantee that hard * interrupts are not reentrant. */ if (!(desc->threads_handled_last & SPURIOUS_DEFERRED)) { desc->threads_handled_last |= SPURIOUS_DEFERRED; return; } /* * Check whether one of the threaded handlers * returned IRQ_HANDLED since the last * interrupt happened. * * For simplicity we just set bit 31, as it is * set in threads_handled_last as well. So we * avoid extra masking. And we really do not * care about the high bits of the handled * count. We just care about the count being * different than the one we saw before. */ handled = atomic_read(&desc->threads_handled); handled |= SPURIOUS_DEFERRED; if (handled != desc->threads_handled_last) { action_ret = IRQ_HANDLED; /* * Note: We keep the SPURIOUS_DEFERRED * bit set. We are handling the * previous invocation right now. * Keep it for the current one, so the * next hardware interrupt will * account for it. */ desc->threads_handled_last = handled; } else { /* * None of the threaded handlers felt * responsible for the last interrupt * * We keep the SPURIOUS_DEFERRED bit * set in threads_handled_last as we * need to account for the current * interrupt as well. */ action_ret = IRQ_NONE; } } else { /* * One of the primary handlers returned * IRQ_HANDLED. So we don't care about the * threaded handlers on the same line. Clear * the deferred detection bit. * * In theory we could/should check whether the * deferred bit is set and take the result of * the previous run into account here as * well. But it's really not worth the * trouble. If every other interrupt is * handled we never trigger the spurious * detector. And if this is just the one out * of 100k unhandled ones which is handled * then we merily delay the spurious detection * by one hard interrupt. Not a real problem. */ desc->threads_handled_last &= ~SPURIOUS_DEFERRED; } } if (unlikely(action_ret == IRQ_NONE)) { /* * If we are seeing only the odd spurious IRQ caused by * bus asynchronicity then don't eventually trigger an error, * otherwise the counter becomes a doomsday timer for otherwise * working systems */ if (time_after(jiffies, desc->last_unhandled + HZ/10)) desc->irqs_unhandled = 1; else desc->irqs_unhandled++; desc->last_unhandled = jiffies; } if (unlikely(try_misrouted_irq(irq, desc, action_ret))) { int ok = misrouted_irq(irq); 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->istate |= IRQS_SPURIOUS_DISABLED; desc->depth++; irq_disable(desc); mod_timer(&poll_spurious_irq_timer, jiffies + POLL_SPURIOUS_IRQ_INTERVAL); } desc->irqs_unhandled = 0; }