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SubjectRe: [Xen-devel] Re: xen: IPI interrupts not resumed early enough on suspend/resume
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On Fri, 2011-10-14 at 14:23 +0100, Ian Campbell wrote:
> Ping? The original issue has made it into longterm-2.6.32.y and then
> onto Debian (bug #644604) so people keep asking me about it...

Sorry, the previous version had a warning in it (was missing the return
type for resume_irqs), fixed up version follows.

I noticed that the backport to longterm 2.6.32 won't work since syscore
isn't available back then. I think one approach for the backport would
be to call irq_pm_syscore_resume() directly from sysdev_resume(), does
that sound sensible?

Ian.

8<------------------------------
From cac68962d009cd916cc66b4d870630adc49c1e1e Mon Sep 17 00:00:00 2001
From: Ian Campbell <ian.campbell@citrix.com>
Date: Mon, 3 Oct 2011 15:37:00 +0100
Subject: [PATCH] irq: add IRQF_RESUME_EARLY and resume such IRQs earlier in the process
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

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: Thomas Gleixner <tglx@linutronix.de>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: stable@kernel.org (at least to 2.6.32.y)
[v2: refactor common code in irq_pm_syscore_resume and resume_device_irqs]
[v3: resume_irqs returns void, "fixing warning: return type defaults to ‘int’"]
---
drivers/xen/events.c | 2 +-
include/linux/interrupt.h | 3 ++
kernel/irq/pm.c | 48 ++++++++++++++++++++++++++++++++++++++------
3 files changed, 45 insertions(+), 8 deletions(-)
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 7523719..44490de 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -1021,7 +1021,7 @@ int bind_ipi_to_irqhandler(enum ipi_vector ipi,
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);
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index a103732..f51a81b 100644
--- 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)

diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
index f76fc00..15e53b1 100644
--- 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);

/**
--
1.7.2.5


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