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![Thomas Gleixner](/assets/img/avatar_default.png)
Currently we suspend wakeup interrupts by lazy disabling them and check later whether the interrupt has fired, but that's not sufficient for suspend to idle as there is no way to check that once we transitioned into the CPU idle state. So we change the mechanism in the following way: 1) Leave the wakeup interrupts enabled across suspend 2) Add a check to irq_may_run() which is called at the beginning of each flow handler whether the interrupt is an armed wakeup source. This check is basically free as it just extends the existing check for IRQD_IRQ_INPROGRESS. So no new conditional in the hot path. If the IRQD_WAKEUP_ARMED flag is set, then the interrupt is disabled, marked as pending/suspended and the pm core is notified about the wakeup event. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> [ rjw: syscore.c and put irq_pm_check_wakeup() into pm.c ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
201 lines
4.8 KiB
C
201 lines
4.8 KiB
C
/*
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* linux/kernel/irq/pm.c
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*
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* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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*
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* This file contains power management functions related to interrupts.
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*/
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/suspend.h>
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#include <linux/syscore_ops.h>
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#include "internals.h"
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bool irq_pm_check_wakeup(struct irq_desc *desc)
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{
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if (irqd_is_wakeup_armed(&desc->irq_data)) {
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irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
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desc->istate |= IRQS_SUSPENDED | IRQS_PENDING;
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desc->depth++;
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irq_disable(desc);
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pm_system_wakeup();
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return true;
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}
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return false;
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}
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/*
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* Called from __setup_irq() with desc->lock held after @action has
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* been installed in the action chain.
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*/
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void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action)
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{
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desc->nr_actions++;
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if (action->flags & IRQF_FORCE_RESUME)
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desc->force_resume_depth++;
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WARN_ON_ONCE(desc->force_resume_depth &&
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desc->force_resume_depth != desc->nr_actions);
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if (action->flags & IRQF_NO_SUSPEND)
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desc->no_suspend_depth++;
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WARN_ON_ONCE(desc->no_suspend_depth &&
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desc->no_suspend_depth != desc->nr_actions);
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}
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/*
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* Called from __free_irq() with desc->lock held after @action has
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* been removed from the action chain.
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*/
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void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action)
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{
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desc->nr_actions--;
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if (action->flags & IRQF_FORCE_RESUME)
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desc->force_resume_depth--;
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if (action->flags & IRQF_NO_SUSPEND)
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desc->no_suspend_depth--;
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}
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static bool suspend_device_irq(struct irq_desc *desc, int irq)
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{
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if (!desc->action || desc->no_suspend_depth)
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return false;
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if (irqd_is_wakeup_set(&desc->irq_data)) {
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irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
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/*
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* We return true here to force the caller to issue
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* synchronize_irq(). We need to make sure that the
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* IRQD_WAKEUP_ARMED is visible before we return from
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* suspend_device_irqs().
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*/
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return true;
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}
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desc->istate |= IRQS_SUSPENDED;
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__disable_irq(desc, irq);
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/*
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* Hardware which has no wakeup source configuration facility
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* requires that the non wakeup interrupts are masked at the
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* chip level. The chip implementation indicates that with
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* IRQCHIP_MASK_ON_SUSPEND.
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*/
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if (irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND)
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mask_irq(desc);
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return true;
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}
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/**
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* suspend_device_irqs - disable all currently enabled interrupt lines
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*
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* During system-wide suspend or hibernation device drivers need to be
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* prevented from receiving interrupts and this function is provided
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* for this purpose.
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*
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* So we disable all interrupts and mark them IRQS_SUSPENDED except
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* for those which are unused, those which are marked as not
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* suspendable via an interrupt request with the flag IRQF_NO_SUSPEND
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* set and those which are marked as active wakeup sources.
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*
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* The active wakeup sources are handled by the flow handler entry
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* code which checks for the IRQD_WAKEUP_ARMED flag, suspends the
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* interrupt and notifies the pm core about the wakeup.
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*/
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void suspend_device_irqs(void)
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{
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struct irq_desc *desc;
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int irq;
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for_each_irq_desc(irq, desc) {
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unsigned long flags;
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bool sync;
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raw_spin_lock_irqsave(&desc->lock, flags);
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sync = suspend_device_irq(desc, irq);
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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if (sync)
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synchronize_irq(irq);
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}
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}
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EXPORT_SYMBOL_GPL(suspend_device_irqs);
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static void resume_irq(struct irq_desc *desc, int irq)
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{
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irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
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if (desc->istate & IRQS_SUSPENDED)
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goto resume;
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/* Force resume the interrupt? */
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if (!desc->force_resume_depth)
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return;
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/* Pretend that it got disabled ! */
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desc->depth++;
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resume:
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desc->istate &= ~IRQS_SUSPENDED;
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__enable_irq(desc, irq);
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}
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static void resume_irqs(bool want_early)
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{
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struct irq_desc *desc;
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int irq;
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for_each_irq_desc(irq, desc) {
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unsigned long flags;
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bool is_early = desc->action &&
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desc->action->flags & IRQF_EARLY_RESUME;
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if (!is_early && want_early)
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continue;
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raw_spin_lock_irqsave(&desc->lock, flags);
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resume_irq(desc, irq);
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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}
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}
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/**
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* irq_pm_syscore_ops - enable interrupt lines early
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*
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* Enable all interrupt lines with %IRQF_EARLY_RESUME set.
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*/
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static void irq_pm_syscore_resume(void)
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{
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resume_irqs(true);
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}
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static struct syscore_ops irq_pm_syscore_ops = {
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.resume = irq_pm_syscore_resume,
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};
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static int __init irq_pm_init_ops(void)
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{
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register_syscore_ops(&irq_pm_syscore_ops);
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return 0;
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}
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device_initcall(irq_pm_init_ops);
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/**
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* resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
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*
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* Enable all non-%IRQF_EARLY_RESUME interrupt lines previously
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* disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag
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* set as well as those with %IRQF_FORCE_RESUME.
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*/
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void resume_device_irqs(void)
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{
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resume_irqs(false);
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}
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EXPORT_SYMBOL_GPL(resume_device_irqs);
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