9bab0b7fba
This adds a mechanism to resume selected IRQs during syscore_resume
instead of dpm_resume_noirq.
Under Xen we need to resume IRQs associated with IPIs early enough
that the resched IPI is unmasked and we can therefore schedule
ourselves out of the stop_machine where the suspend/resume takes
place.
This issue was introduced by 676dc3cf5b "xen: Use IRQF_FORCE_RESUME".
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Jeremy Fitzhardinge <Jeremy.Fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1318713254.11016.52.camel@dagon.hellion.org.uk
Cc: stable@kernel.org (at least to 2.6.32.y)
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
|
|
* linux/kernel/irq/pm.c
|
|
*
|
|
* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
|
|
*
|
|
* This file contains power management functions related to interrupts.
|
|
*/
|
|
|
|
#include <linux/irq.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/syscore_ops.h>
|
|
|
|
#include "internals.h"
|
|
|
|
/**
|
|
* suspend_device_irqs - disable all currently enabled interrupt lines
|
|
*
|
|
* During system-wide suspend or hibernation device drivers need to be prevented
|
|
* from receiving interrupts and this function is provided for this purpose.
|
|
* It marks all interrupt lines in use, except for the timer ones, as disabled
|
|
* and sets the IRQS_SUSPENDED flag for each of them.
|
|
*/
|
|
void suspend_device_irqs(void)
|
|
{
|
|
struct irq_desc *desc;
|
|
int irq;
|
|
|
|
for_each_irq_desc(irq, desc) {
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
__disable_irq(desc, irq, true);
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
|
|
for_each_irq_desc(irq, desc)
|
|
if (desc->istate & IRQS_SUSPENDED)
|
|
synchronize_irq(irq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(suspend_device_irqs);
|
|
|
|
static void resume_irqs(bool want_early)
|
|
{
|
|
struct irq_desc *desc;
|
|
int irq;
|
|
|
|
for_each_irq_desc(irq, desc) {
|
|
unsigned long flags;
|
|
bool is_early = desc->action &&
|
|
desc->action->flags & IRQF_EARLY_RESUME;
|
|
|
|
if (is_early != want_early)
|
|
continue;
|
|
|
|
raw_spin_lock_irqsave(&desc->lock, flags);
|
|
__enable_irq(desc, irq, true);
|
|
raw_spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* irq_pm_syscore_ops - enable interrupt lines early
|
|
*
|
|
* Enable all interrupt lines with %IRQF_EARLY_RESUME set.
|
|
*/
|
|
static void irq_pm_syscore_resume(void)
|
|
{
|
|
resume_irqs(true);
|
|
}
|
|
|
|
static struct syscore_ops irq_pm_syscore_ops = {
|
|
.resume = irq_pm_syscore_resume,
|
|
};
|
|
|
|
static int __init irq_pm_init_ops(void)
|
|
{
|
|
register_syscore_ops(&irq_pm_syscore_ops);
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(irq_pm_init_ops);
|
|
|
|
/**
|
|
* resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
|
|
*
|
|
* Enable all non-%IRQF_EARLY_RESUME interrupt lines previously
|
|
* disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag
|
|
* set as well as those with %IRQF_FORCE_RESUME.
|
|
*/
|
|
void resume_device_irqs(void)
|
|
{
|
|
resume_irqs(false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(resume_device_irqs);
|
|
|
|
/**
|
|
* check_wakeup_irqs - check if any wake-up interrupts are pending
|
|
*/
|
|
int check_wakeup_irqs(void)
|
|
{
|
|
struct irq_desc *desc;
|
|
int irq;
|
|
|
|
for_each_irq_desc(irq, desc) {
|
|
if (irqd_is_wakeup_set(&desc->irq_data)) {
|
|
if (desc->istate & IRQS_PENDING)
|
|
return -EBUSY;
|
|
continue;
|
|
}
|
|
/*
|
|
* Check the non wakeup interrupts whether they need
|
|
* to be masked before finally going into suspend
|
|
* state. That's for hardware which has no wakeup
|
|
* source configuration facility. The chip
|
|
* implementation indicates that with
|
|
* IRQCHIP_MASK_ON_SUSPEND.
|
|
*/
|
|
if (desc->istate & IRQS_SUSPENDED &&
|
|
irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND)
|
|
mask_irq(desc);
|
|
}
|
|
|
|
return 0;
|
|
}
|