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Message-Id: <200908272119.47053.rjw@sisk.pl>
Date: Thu, 27 Aug 2009 21:19:46 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: "linux-pm" <linux-pm@...ts.linux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
Pavel Machek <pavel@....cz>,
Alan Stern <stern@...land.harvard.edu>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Arjan van de Ven <arjan@...radead.org>,
Zhang Rui <rui.zhang@...el.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Linux PCI <linux-pci@...r.kernel.org>
Subject: [PATCH 7] PM: Add a switch for disabling/enabling asynchronous suspend/resume
From: Rafael J. Wysocki <rjw@...k.pl>
Add sysfs attribute kernel/power/pm_async allowing the user space to
disable and enable async suspend/resume of devices.
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
drivers/base/power/main.c | 13 +++++++------
drivers/base/power/power.h | 6 +++---
kernel/power/main.c | 28 +++++++++++++++++++++++++++-
3 files changed, 37 insertions(+), 10 deletions(-)
Index: linux-2.6/kernel/power/main.c
===================================================================
--- linux-2.6.orig/kernel/power/main.c
+++ linux-2.6/kernel/power/main.c
@@ -44,6 +44,29 @@ int pm_notifier_call_chain(unsigned long
== NOTIFY_BAD) ? -EINVAL : 0;
}
+/* If set, devices may be suspended and resumed asynchronously. */
+int pm_async_enabled = 1;
+
+static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%d\n", pm_async_enabled);
+}
+
+static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t n)
+{
+ int val;
+
+ if (sscanf(buf, "%d", &val) == 1) {
+ pm_async_enabled = !!val;
+ return n;
+ }
+ return -EINVAL;
+}
+
+power_attr(pm_async);
+
#ifdef CONFIG_PM_DEBUG
int pm_test_level = TEST_NONE;
@@ -208,9 +231,12 @@ static struct attribute * g[] = {
#ifdef CONFIG_PM_TRACE
&pm_trace_attr.attr,
#endif
-#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG)
+#ifdef CONFIG_PM_SLEEP
+ &pm_async_attr.attr,
+#ifdef CONFIG_PM_DEBUG
&pm_test_attr.attr,
#endif
+#endif
NULL,
};
Index: linux-2.6/drivers/base/power/main.c
===================================================================
--- linux-2.6.orig/drivers/base/power/main.c
+++ linux-2.6/drivers/base/power/main.c
@@ -235,7 +235,7 @@ static int device_pm_wait_fn(struct devi
*/
static void device_pm_wait_for_masters(struct device *slave)
{
- if (!pm_trace_enabled)
+ if (pm_async_enabled && !pm_trace_enabled)
device_for_each_master(slave, slave, device_pm_wait_fn);
}
@@ -245,7 +245,8 @@ static void device_pm_wait_for_masters(s
*/
static void device_pm_wait_for_slaves(struct device *master)
{
- device_for_each_slave(master, master, device_pm_wait_fn);
+ if (pm_async_enabled)
+ device_for_each_slave(master, master, device_pm_wait_fn);
}
/**
@@ -560,7 +561,7 @@ static int device_resume_noirq(struct de
if (pm_op_started(dev))
return 0;
- if (dev->power.async_suspend && !pm_trace_enabled) {
+ if (pm_async_enabled && !pm_trace_enabled && dev->power.async_suspend) {
async_schedule(async_resume_noirq, dev);
return 0;
}
@@ -719,7 +720,7 @@ static int device_resume(struct device *
if (pm_op_started(dev))
return 0;
- if (dev->power.async_suspend && !pm_trace_enabled) {
+ if (pm_async_enabled && !pm_trace_enabled && dev->power.async_suspend) {
get_device(dev);
async_schedule(async_resume, dev);
return 0;
@@ -965,7 +966,7 @@ static int device_suspend_noirq(struct d
if (pm_op_started(dev))
return 0;
- if (dev->power.async_suspend) {
+ if (pm_async_enabled && dev->power.async_suspend) {
async_schedule(async_suspend_noirq, dev);
return 0;
}
@@ -1139,7 +1140,7 @@ static int device_suspend(struct device
if (pm_op_started(dev))
return 0;
- if (dev->power.async_suspend) {
+ if (pm_async_enabled && dev->power.async_suspend) {
get_device(dev);
async_schedule(async_suspend, dev);
return 0;
Index: linux-2.6/drivers/base/power/power.h
===================================================================
--- linux-2.6.orig/drivers/base/power/power.h
+++ linux-2.6/drivers/base/power/power.h
@@ -16,10 +16,10 @@ static inline void pm_runtime_remove(str
#ifdef CONFIG_PM_SLEEP
-/*
- * main.c
- */
+/* kernel/power/main.c */
+extern int pm_async_enabled;
+/* drivers/base/power/main.c */
extern struct list_head dpm_list; /* The active device list */
static inline struct device *to_device(struct list_head *entry)
--
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