예제 #1
0
파일: proc.c 프로젝트: xiandaicxsj/copyKvm
static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
				   unsigned long count, void *data)
{
	unsigned int irq = (int)(long)data, full_count = count, err;
	cpumask_t new_value, tmp;

	if (!irq_desc[irq].chip->set_affinity || no_irq_affinity ||
				CHECK_IRQ_PER_CPU(irq_desc[irq].status))
		return -EIO;

	err = cpumask_parse_user(buffer, count, new_value);
	if (err)
		return err;

	/*
	 * Do not allow disabling IRQs completely - it's a too easy
	 * way to make the system unusable accidentally :-) At least
	 * one online CPU still has to be targeted.
	 */
	cpus_and(tmp, new_value, cpu_online_map);
	if (cpus_empty(tmp))
		/* Special case for empty set - allow the architecture
		   code to set default SMP affinity. */
		return select_smp_affinity(irq) ? -EINVAL : full_count;

	proc_set_irq_affinity(irq, new_value);

	return full_count;
}
예제 #2
0
/**
 *	irq_can_set_affinity - Check if the affinity of a given irq can be set
 *	@irq:		Interrupt to check
 *
 */
int irq_can_set_affinity(unsigned int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);

	if (CHECK_IRQ_PER_CPU(desc->status) || !desc->irq_data.chip ||
	    !desc->irq_data.chip->irq_set_affinity)
		return 0;

	return 1;
}
예제 #3
0
void move_masked_irq(int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);

	if (likely(!(desc->status & IRQ_MOVE_PENDING)))
		return;

	/*
	 * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
	 */
	if (CHECK_IRQ_PER_CPU(desc->status)) {
		WARN_ON(1);
		return;
	}

	desc->status &= ~IRQ_MOVE_PENDING;

	if (unlikely(cpumask_empty(desc->pending_mask)))
		return;

	if (!desc->chip->set_affinity)
		return;

	assert_spin_locked(&desc->lock);

	/*
	 * If there was a valid mask to work with, please
	 * do the disable, re-program, enable sequence.
	 * This is *not* particularly important for level triggered
	 * but in a edge trigger case, we might be setting rte
	 * when an active trigger is comming in. This could
	 * cause some ioapics to mal-function.
	 * Being paranoid i guess!
	 *
	 * For correct operation this depends on the caller
	 * masking the irqs.
	 */
	if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
		   < nr_cpu_ids)) {
		int ret = chip->irq_set_affinity(irq, desc->pending_mask);
		switch (ret) {
		case IRQ_SET_MASK_OK:
			cpumask_copy(desc->affinity, desc->pending_mask);
		case IRQ_SET_MASK_OK_NOCOPY:
			irq_set_thread_affinity(desc);
		}
	}

	cpumask_clear(desc->pending_mask);
}
예제 #4
0
int cpu_check_affinity(unsigned int irq, const struct cpumask *dest)
{
	int cpu_dest;

	/* timer and ipi have to always be received on all CPUs */
	if (CHECK_IRQ_PER_CPU(irq)) {
		/* Bad linux design decision.  The mask has already
		 * been set; we must reset it */
		cpumask_setall(irq_desc[irq].affinity);
		return -EINVAL;
	}

	/* whatever mask they set, we just allow one CPU */
	cpu_dest = first_cpu(*dest);

	return cpu_dest;
}
예제 #5
0
void move_masked_irq(int irq)
{
	struct irq_desc *desc = irq_desc + irq;
	cpumask_t tmp;

	if (likely(!(desc->status & IRQ_MOVE_PENDING)))
		return;

	/*
	 * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
	 */
	if (CHECK_IRQ_PER_CPU(desc->status)) {
		WARN_ON(1);
		return;
	}

	desc->status &= ~IRQ_MOVE_PENDING;

	if (unlikely(cpus_empty(irq_desc[irq].pending_mask)))
		return;

	if (!desc->chip->set_affinity)
		return;

	assert_spin_locked(&desc->lock);

	cpus_and(tmp, irq_desc[irq].pending_mask, cpu_online_map);

	/*
	 * If there was a valid mask to work with, please
	 * do the disable, re-program, enable sequence.
	 * This is *not* particularly important for level triggered
	 * but in a edge trigger case, we might be setting rte
	 * when an active trigger is comming in. This could
	 * cause some ioapics to mal-function.
	 * Being paranoid i guess!
	 *
	 * For correct operation this depends on the caller
	 * masking the irqs.
	 */
	if (likely(!cpus_empty(tmp))) {
		desc->chip->set_affinity(irq,tmp);
	}
	cpus_clear(irq_desc[irq].pending_mask);
}
예제 #6
0
/* ONLY called from entry.S:intr_extint() */
void do_cpu_irq_mask(struct pt_regs *regs)
{
	struct pt_regs *old_regs;
	unsigned long eirr_val;
	int irq, cpu = smp_processor_id();
#ifdef CONFIG_SMP
	cpumask_t dest;
#endif

	old_regs = set_irq_regs(regs);
	local_irq_disable();
	irq_enter();

	eirr_val = mfctl(23) & cpu_eiem & per_cpu(local_ack_eiem, cpu);
	if (!eirr_val)
		goto set_out;
	irq = eirr_to_irq(eirr_val);

#ifdef CONFIG_SMP
	cpumask_copy(&dest, irq_desc[irq].affinity);
	if (CHECK_IRQ_PER_CPU(irq_desc[irq].status) &&
	    !cpu_isset(smp_processor_id(), dest)) {
		int cpu = first_cpu(dest);

		printk(KERN_DEBUG "redirecting irq %d from CPU %d to %d\n",
		       irq, smp_processor_id(), cpu);
		gsc_writel(irq + CPU_IRQ_BASE,
			   per_cpu(cpu_data, cpu).hpa);
		goto set_out;
	}
#endif
	__do_IRQ(irq);

 out:
	irq_exit();
	set_irq_regs(old_regs);
	return;

 set_out:
	set_eiem(cpu_eiem & per_cpu(local_ack_eiem, cpu));
	goto out;
}
예제 #7
0
/**
 * __do_IRQ - original all in one highlevel IRQ handler
 * @irq:	the interrupt number
 *
 * __do_IRQ handles all normal device IRQ's (the special
 * SMP cross-CPU interrupts have their own specific
 * handlers).
 *
 * This is the original x86 implementation which is used for every
 * interrupt type.
 */
unsigned int __do_IRQ(unsigned int irq)
{
	struct irq_desc *desc = irq_to_desc(irq);
	struct irqaction *action;
	unsigned int status;

	kstat_incr_irqs_this_cpu(irq, desc);

	if (CHECK_IRQ_PER_CPU(desc->status)) {
		irqreturn_t action_ret;

		/*
		 * No locking required for CPU-local interrupts:
		 */
		if (desc->chip->ack)
			desc->chip->ack(irq);
		if (likely(!(desc->status & IRQ_DISABLED))) {
			action_ret = handle_IRQ_event(irq, desc->action);
			if (!noirqdebug)
				note_interrupt(irq, desc, action_ret);
		}
		desc->chip->end(irq);
		return 1;
	}

	spin_lock(&desc->lock);
	if (desc->chip->ack)
		desc->chip->ack(irq);
	/*
	 * REPLAY is when Linux resends an IRQ that was dropped earlier
	 * WAITING is used by probe to mark irqs that are being tested
	 */
	status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING);
	status |= IRQ_PENDING; /* we _want_ to handle it */

	/*
	 * If the IRQ is disabled for whatever reason, we cannot
	 * use the action we have.
	 */
	action = NULL;
	if (likely(!(status & (IRQ_DISABLED | IRQ_INPROGRESS)))) {
		action = desc->action;
		status &= ~IRQ_PENDING; /* we commit to handling */
		status |= IRQ_INPROGRESS; /* we are handling it */
	}
	desc->status = status;

	/*
	 * If there is no IRQ handler or it was disabled, exit early.
	 * Since we set PENDING, if another processor is handling
	 * a different instance of this same irq, the other processor
	 * will take care of it.
	 */
	if (unlikely(!action))
		goto out;

	/*
	 * Edge triggered interrupts need to remember
	 * pending events.
	 * This applies to any hw interrupts that allow a second
	 * instance of the same irq to arrive while we are in do_IRQ
	 * or in the handler. But the code here only handles the _second_
	 * instance of the irq, not the third or fourth. So it is mostly
	 * useful for irq hardware that does not mask cleanly in an
	 * SMP environment.
	 */
	for (;;) {
		irqreturn_t action_ret;

		spin_unlock(&desc->lock);

		action_ret = handle_IRQ_event(irq, action);
		if (!noirqdebug)
			note_interrupt(irq, desc, action_ret);

		spin_lock(&desc->lock);
		if (likely(!(desc->status & IRQ_PENDING)))
			break;
		desc->status &= ~IRQ_PENDING;
	}
	desc->status &= ~IRQ_INPROGRESS;

out:
	/*
	 * The ->end() handler has to deal with interrupts which got
	 * disabled while the handler was running.
	 */
	desc->chip->end(irq);
	spin_unlock(&desc->lock);

	return 1;
}
예제 #8
0
/**
 * __do_IRQ - original all in one highlevel IRQ handler
 * @irq:	the interrupt number
 * @regs:	pointer to a register structure
 *
 * __do_IRQ handles all normal device IRQ's (the special
 * SMP cross-CPU interrupts have their own specific
 * handlers).
 *
 * This is the original x86 implementation which is used for every
 * interrupt type.
 */
fastcall notrace unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs)
{
	struct irq_desc *desc = irq_desc + irq;
	struct irqaction *action;
	unsigned int status;

	kstat_this_cpu.irqs[irq]++;
	if (CHECK_IRQ_PER_CPU(desc->status)) {
		irqreturn_t action_ret;

		/*
		 * No locking required for CPU-local interrupts:
		 */
		if (desc->chip->ack)
			desc->chip->ack(irq);
		action_ret = handle_IRQ_event(irq, regs, desc->action);
		desc->chip->end(irq);
		return 1;
	}
	/*
	 * If the task is currently running in user mode, don't
	 * detect soft lockups.  If CONFIG_DETECT_SOFTLOCKUP is not
	 * configured, this should be optimized out.
	 */
	if (user_mode(regs))
		touch_softlockup_watchdog();

	spin_lock(&desc->lock);
	if (desc->chip->ack)
		desc->chip->ack(irq);
	/*
	 * REPLAY is when Linux resends an IRQ that was dropped earlier
	 * WAITING is used by probe to mark irqs that are being tested
	 */
	status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING);
	status |= IRQ_PENDING; /* we _want_ to handle it */

	/*
	 * If the IRQ is disabled for whatever reason, we cannot
	 * use the action we have.
	 */
	action = NULL;
	if (likely(!(status & (IRQ_DISABLED | IRQ_INPROGRESS)))) {
		action = desc->action;
		status &= ~IRQ_PENDING; /* we commit to handling */
		status |= IRQ_INPROGRESS; /* we are handling it */
	}
	desc->status = status;

	/*
	 * If there is no IRQ handler or it was disabled, exit early.
	 * Since we set PENDING, if another processor is handling
	 * a different instance of this same irq, the other processor
	 * will take care of it.
	 */
	if (unlikely(!action))
		goto out;

	/*
	 * hardirq redirection to the irqd process context:
	 */
	if (redirect_hardirq(desc))
		goto out_no_end;

	/*
	 * Edge triggered interrupts need to remember
	 * pending events.
	 * This applies to any hw interrupts that allow a second
	 * instance of the same irq to arrive while we are in do_IRQ
	 * or in the handler. But the code here only handles the _second_
	 * instance of the irq, not the third or fourth. So it is mostly
	 * useful for irq hardware that does not mask cleanly in an
	 * SMP environment.
	 */
	for (;;) {
		irqreturn_t action_ret;

		spin_unlock(&desc->lock);

		action_ret = handle_IRQ_event(irq, regs, action);

		spin_lock(&desc->lock);
		if (!noirqdebug)
			note_interrupt(irq, desc, action_ret, regs);
		if (likely(!(desc->status & IRQ_PENDING)))
			break;
		desc->status &= ~IRQ_PENDING;
	}
	desc->status &= ~IRQ_INPROGRESS;

out:
	/*
	 * The ->end() handler has to deal with interrupts which got
	 * disabled while the handler was running.
	 */
	desc->chip->end(irq);
out_no_end:
	spin_unlock(&desc->lock);

	return 1;
}