| From 9bab0b7fbaceec47d32db51cd9e59c82fb071f5a Mon Sep 17 00:00:00 2001 |
| From: Ian Campbell <ian.campbell@citrix.com> |
| Date: Mon, 3 Oct 2011 15:37:00 +0100 |
| Subject: genirq: Add IRQF_RESUME_EARLY and resume such IRQs earlier |
| |
| From: Ian Campbell <ian.campbell@citrix.com> |
| |
| commit 9bab0b7fbaceec47d32db51cd9e59c82fb071f5a upstream. |
| |
| 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 676dc3cf5bc3 "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 |
| Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
| |
| --- |
| drivers/xen/events.c | 2 - |
| include/linux/interrupt.h | 3 ++ |
| kernel/irq/pm.c | 48 +++++++++++++++++++++++++++++++++++++++------- |
| 3 files changed, 45 insertions(+), 8 deletions(-) |
| |
| --- a/drivers/xen/events.c |
| +++ b/drivers/xen/events.c |
| @@ -1021,7 +1021,7 @@ int bind_ipi_to_irqhandler(enum ipi_vect |
| if (irq < 0) |
| return irq; |
| |
| - irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME; |
| + irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME; |
| retval = request_irq(irq, handler, irqflags, devname, dev_id); |
| if (retval != 0) { |
| unbind_from_irq(irq); |
| --- a/include/linux/interrupt.h |
| +++ b/include/linux/interrupt.h |
| @@ -59,6 +59,8 @@ |
| * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend |
| * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set |
| * IRQF_NO_THREAD - Interrupt cannot be threaded |
| + * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device |
| + * resume time. |
| */ |
| #define IRQF_DISABLED 0x00000020 |
| #define IRQF_SAMPLE_RANDOM 0x00000040 |
| @@ -72,6 +74,7 @@ |
| #define IRQF_NO_SUSPEND 0x00004000 |
| #define IRQF_FORCE_RESUME 0x00008000 |
| #define IRQF_NO_THREAD 0x00010000 |
| +#define IRQF_EARLY_RESUME 0x00020000 |
| |
| #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) |
| |
| --- a/kernel/irq/pm.c |
| +++ b/kernel/irq/pm.c |
| @@ -9,6 +9,7 @@ |
| #include <linux/irq.h> |
| #include <linux/module.h> |
| #include <linux/interrupt.h> |
| +#include <linux/syscore_ops.h> |
| |
| #include "internals.h" |
| |
| @@ -39,25 +40,58 @@ void suspend_device_irqs(void) |
| } |
| EXPORT_SYMBOL_GPL(suspend_device_irqs); |
| |
| -/** |
| - * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs() |
| - * |
| - * Enable all interrupt lines previously disabled by suspend_device_irqs() that |
| - * have the IRQS_SUSPENDED flag set. |
| - */ |
| -void resume_device_irqs(void) |
| +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); |
| |
| /** |