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;
}
