From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux PM list <linux-pm@vger.kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alan Stern <stern@rowland.harvard.edu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Tomeu Vizoso <tomeu.vizoso@collabora.com>,
Mark Brown <broonie@kernel.og>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Lukas Wunner <lukas@wunner.de>, Kevin Hilman <khilman@kernel.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
"Luis R. Rodriguez" <mcgrof@suse.com>
Subject: [RFC/RFT][PATCH v2 5/7] PM / runtime: Flag to indicate PM sleep transitions in progress
Date: Thu, 08 Sep 2016 23:29:48 +0200 [thread overview]
Message-ID: <3677187.4hCpDgWMoX@vostro.rjw.lan> (raw)
In-Reply-To: <27296716.H9VWo8ShOm@vostro.rjw.lan>
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Introduce a new flag in struct dev_pm_info, pm_sleep_in_progress, to
indicate that runtime PM has been disabled because of a PM sleep
transition in progress.
Make __pm_runtime_disable() set that flag when invoked with
RPM_DISABLE_ENABLE_PM_SLEEP set in its second argument and make
the PM core call it that way during system sleep transitions.
Introduce __pm_runtime_enable() so that it can take a second flags
argument and make it clear power.pm_sleep_in_progress for the device
if invoked with RPM_DISABLE_ENABLE_PM_SLEEP set. Also make the PM
core pass RPM_DISABLE_ENABLE_PM_SLEEP to it during transitions from
system sleep to the working state.
Modify rpm_idle(), rpm_resume, rpm_suspend() and pm_schedule_suspend()
to neglect error codes and return 0 (without doing anything else)
when power.pm_sleep_in_progress is set for the device.
That will allow helpers like pm_runtime_get_sync() to be called
during system sleep transitions without worrying about possible
error codes they may return because runtime PM is disabled at
that point.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
Documentation/power/runtime_pm.txt | 15 ++++++++-------
drivers/base/power/main.c | 12 ++++++------
drivers/base/power/runtime.c | 29 +++++++++++++++++++++++------
include/linux/pm.h | 1 +
include/linux/pm_runtime.h | 12 ++++++++++--
5 files changed, 48 insertions(+), 21 deletions(-)
Index: linux-pm/Documentation/power/runtime_pm.txt
===================================================================
--- linux-pm.orig/Documentation/power/runtime_pm.txt
+++ linux-pm/Documentation/power/runtime_pm.txt
@@ -685,14 +685,15 @@ out the following operations:
right before executing the subsystem-level .prepare() callback for it and
pm_runtime_barrier() is called for every device right before executing the
subsystem-level .suspend() callback for it. In addition to that the PM core
- calls __pm_runtime_disable() with 0 as the second argument for every
- device right before executing the subsystem-level .suspend_late() callback
- for it.
+ calls __pm_runtime_disable() with RPM_DISABLE_ENABLE_PM_SLEEP as the second
+ argument for every device right before executing the subsystem-level
+ .suspend_late() callback for it.
- * During system resume pm_runtime_enable() and pm_runtime_put() are called for
- every device right after executing the subsystem-level .resume_early()
- callback and right after executing the subsystem-level .complete() callback
- for it, respectively.
+ * During system resume __pm_runtime_enable() (with RPM_DISABLE_ENABLE_PM_SLEEP
+ as the second argument) and pm_runtime_put() are called for every device
+ right after executing the subsystem-level .resume_early() callback and right
+ after executing the subsystem-level .complete() callback for it,
+ respectively.
7. Generic subsystem callbacks
Index: linux-pm/drivers/base/power/main.c
===================================================================
--- linux-pm.orig/drivers/base/power/main.c
+++ linux-pm/drivers/base/power/main.c
@@ -701,7 +701,7 @@ static int device_resume_early(struct de
Out:
TRACE_RESUME(error);
- pm_runtime_enable(dev);
+ __pm_runtime_enable(dev, RPM_DISABLE_ENABLE_PM_SLEEP);
complete_all(&dev->power.completion);
return error;
}
@@ -801,8 +801,8 @@ static int device_resume(struct device *
goto Complete;
if (dev->power.direct_complete) {
- /* Match the pm_runtime_disable() in __device_suspend(). */
- pm_runtime_enable(dev);
+ /* Match the __pm_runtime_disable() in __device_suspend(). */
+ __pm_runtime_enable(dev, RPM_DISABLE_ENABLE_PM_SLEEP);
goto Complete;
}
@@ -1228,7 +1228,7 @@ static int __device_suspend_late(struct
TRACE_DEVICE(dev);
TRACE_SUSPEND(0);
- __pm_runtime_disable(dev, 0);
+ __pm_runtime_disable(dev, RPM_DISABLE_ENABLE_PM_SLEEP);
if (async_error)
goto Complete;
@@ -1438,11 +1438,11 @@ static int __device_suspend(struct devic
if (dev->power.direct_complete) {
if (pm_runtime_status_suspended(dev)) {
- pm_runtime_disable(dev);
+ __pm_runtime_disable(dev, RPM_DISABLE_ALL);
if (pm_runtime_status_suspended(dev))
goto Complete;
- pm_runtime_enable(dev);
+ __pm_runtime_enable(dev, RPM_DISABLE_ENABLE_PM_SLEEP);
}
dev->power.direct_complete = false;
}
Index: linux-pm/drivers/base/power/runtime.c
===================================================================
--- linux-pm.orig/drivers/base/power/runtime.c
+++ linux-pm/drivers/base/power/runtime.c
@@ -353,6 +353,9 @@ static int rpm_idle(struct device *dev,
out:
trace_rpm_return_int_rcuidle(dev, _THIS_IP_, retval);
+ if (retval && dev->power.pm_sleep_in_progress)
+ return 0;
+
return retval ? retval : rpm_suspend(dev, rpmflags | RPM_AUTO);
}
@@ -550,6 +553,8 @@ static int rpm_suspend(struct device *de
out:
trace_rpm_return_int(dev, _THIS_IP_, retval);
+ if (retval && dev->power.pm_sleep_in_progress)
+ return 0;
return retval;
@@ -765,6 +770,8 @@ static int rpm_resume(struct device *dev
}
trace_rpm_return_int_rcuidle(dev, _THIS_IP_, retval);
+ if (retval && dev->power.pm_sleep_in_progress)
+ return 0;
return retval;
}
@@ -867,6 +874,8 @@ int pm_schedule_suspend(struct device *d
out:
spin_unlock_irqrestore(&dev->power.lock, flags);
+ if (retval && dev->power.pm_sleep_in_progress)
+ return 0;
return retval;
}
@@ -1200,28 +1209,35 @@ void __pm_runtime_disable(struct device
__pm_runtime_barrier(dev);
out:
+ if (flags & RPM_DISABLE_ENABLE_PM_SLEEP)
+ dev->power.pm_sleep_in_progress = true;
+
spin_unlock_irq(&dev->power.lock);
}
EXPORT_SYMBOL_GPL(__pm_runtime_disable);
/**
- * pm_runtime_enable - Enable runtime PM of a device.
+ * __pm_runtime_enable - Enable runtime PM of a device.
* @dev: Device to handle.
+ * @flags: Behavior modifiers.
*/
-void pm_runtime_enable(struct device *dev)
+void __pm_runtime_enable(struct device *dev, unsigned int flags)
{
- unsigned long flags;
+ unsigned long irqflags;
- spin_lock_irqsave(&dev->power.lock, flags);
+ spin_lock_irqsave(&dev->power.lock, irqflags);
+
+ if (flags & RPM_DISABLE_ENABLE_PM_SLEEP)
+ dev->power.pm_sleep_in_progress = false;
if (dev->power.disable_depth > 0)
dev->power.disable_depth--;
else
dev_warn(dev, "Unbalanced %s!\n", __func__);
- spin_unlock_irqrestore(&dev->power.lock, flags);
+ spin_unlock_irqrestore(&dev->power.lock, irqflags);
}
-EXPORT_SYMBOL_GPL(pm_runtime_enable);
+EXPORT_SYMBOL_GPL(__pm_runtime_enable);
/**
* pm_runtime_forbid - Block runtime PM of a device.
@@ -1396,6 +1412,7 @@ void pm_runtime_init(struct device *dev)
dev->power.idle_notification = false;
dev->power.disable_depth = 1;
+ dev->power.pm_sleep_in_progress = false;
atomic_set(&dev->power.usage_count, 0);
dev->power.runtime_error = 0;
Index: linux-pm/include/linux/pm.h
===================================================================
--- linux-pm.orig/include/linux/pm.h
+++ linux-pm/include/linux/pm.h
@@ -585,6 +585,7 @@ struct dev_pm_info {
atomic_t usage_count;
atomic_t child_count;
unsigned int disable_depth:3;
+ bool pm_sleep_in_progress:1;
unsigned int idle_notification:1;
unsigned int request_pending:1;
unsigned int deferred_resume:1;
Index: linux-pm/include/linux/pm_runtime.h
===================================================================
--- linux-pm.orig/include/linux/pm_runtime.h
+++ linux-pm/include/linux/pm_runtime.h
@@ -25,6 +25,9 @@
/* Runtime PM disable/enable flags */
#define RPM_DISABLE_CHECK_RESUME (1 << 0)
+#define RPM_DISABLE_ENABLE_PM_SLEEP (1 << 1)
+
+#define RPM_DISABLE_ALL (RPM_DISABLE_CHECK_RESUME | RPM_DISABLE_ENABLE_PM_SLEEP)
#ifdef CONFIG_PM
extern struct workqueue_struct *pm_wq;
@@ -46,7 +49,7 @@ extern int pm_runtime_get_if_in_use(stru
extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
extern int pm_runtime_barrier(struct device *dev);
-extern void pm_runtime_enable(struct device *dev);
+extern void __pm_runtime_enable(struct device *dev, unsigned int flags);
extern void __pm_runtime_disable(struct device *dev, unsigned int flags);
extern void pm_runtime_allow(struct device *dev);
extern void pm_runtime_forbid(struct device *dev);
@@ -159,7 +162,7 @@ static inline int pm_runtime_get_if_in_u
static inline int __pm_runtime_set_status(struct device *dev,
unsigned int status) { return 0; }
static inline int pm_runtime_barrier(struct device *dev) { return 0; }
-static inline void pm_runtime_enable(struct device *dev) {}
+static inline void __pm_runtime_enable(struct device *dev, unsigned int flags) {}
static inline void __pm_runtime_disable(struct device *dev, unsigned int flags) {}
static inline void pm_runtime_allow(struct device *dev) {}
static inline void pm_runtime_forbid(struct device *dev) {}
@@ -278,6 +281,11 @@ static inline void pm_runtime_disable(st
__pm_runtime_disable(dev, RPM_DISABLE_CHECK_RESUME);
}
+static inline void pm_runtime_enable(struct device *dev)
+{
+ __pm_runtime_enable(dev, 0);
+}
+
static inline void pm_runtime_use_autosuspend(struct device *dev)
{
__pm_runtime_use_autosuspend(dev, true);
next prev parent reply other threads:[~2016-09-08 21:27 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-08 21:25 [RFC/RFT][PATCH v2 0/7] Functional dependencies between devices Rafael J. Wysocki
2016-09-08 21:26 ` [RFC/RFT][PATCH v2 1/7] driver core: Add a wrapper around __device_release_driver() Rafael J. Wysocki
2016-09-08 21:27 ` [RFC/RFT][PATCH v2 2/7] driver core: Functional dependencies tracking support Rafael J. Wysocki
2016-09-09 8:25 ` Ulf Hansson
2016-09-09 12:06 ` Mark Brown
2016-09-09 14:13 ` Ulf Hansson
2016-09-15 1:11 ` Rafael J. Wysocki
2016-09-11 13:40 ` Lukas Wunner
2016-09-11 20:43 ` Lukas Wunner
2016-09-14 1:21 ` Rafael J. Wysocki
2016-09-14 8:28 ` Lukas Wunner
2016-09-14 13:17 ` Rafael J. Wysocki
2016-09-08 21:28 ` [RFC/RFT][PATCH v2 3/7] PM / sleep: Make async suspend/resume of devices use device links Rafael J. Wysocki
2016-09-10 13:31 ` Lukas Wunner
2016-09-10 22:12 ` Rafael J. Wysocki
2016-09-08 21:29 ` [RFC/RFT][PATCH v2 4/7] PM / runtime: Pass flags argument to __pm_runtime_disable() Rafael J. Wysocki
2016-09-08 21:29 ` Rafael J. Wysocki [this message]
2016-09-12 14:07 ` [RFC/RFT][PATCH v2 5/7] PM / runtime: Flag to indicate PM sleep transitions in progress Lukas Wunner
2016-09-12 21:25 ` Rafael J. Wysocki
2016-09-12 22:52 ` Lukas Wunner
2016-09-13 7:21 ` Marek Szyprowski
2016-09-13 23:59 ` Rafael J. Wysocki
2016-09-08 21:30 ` [RFC/RFT][PATCH v2 6/7] PM / runtime: Use device links Rafael J. Wysocki
2016-09-12 9:47 ` Lukas Wunner
2016-09-12 13:57 ` Rafael J. Wysocki
2016-09-14 1:19 ` Rafael J. Wysocki
2016-09-08 21:31 ` [RFC/RFT][PATCH v2 7/7] PM / runtime: Optimize the use of " Rafael J. Wysocki
2016-09-08 21:35 ` [RFC/RFT][PATCH v2 0/7] Functional dependencies between devices Rafael J. Wysocki
2016-09-10 11:39 ` Lukas Wunner
2016-09-10 22:04 ` Rafael J. Wysocki
2016-09-13 17:57 ` Lukas Wunner
2016-09-13 23:18 ` Rafael J. Wysocki
2016-09-18 12:39 ` Lukas Wunner
[not found] ` <CGME20160913095858eucas1p267ec2397c9e4577f94557e4a38498164@eucas1p2.samsung.com>
2016-09-13 9:58 ` Marek Szyprowski
2016-09-13 22:41 ` Rafael J. Wysocki
2016-09-18 11:23 ` Lukas Wunner
2016-09-15 22:03 ` [RFC/RFT][PATCH v3 0/5] " Rafael J. Wysocki
2016-09-15 22:04 ` [Resend][RFC/RFT][PATCH v3 1/5] driver core: Add a wrapper around __device_release_driver() Rafael J. Wysocki
2016-09-15 22:06 ` [RFC/RFT][PATCH v3 2/5] driver core: Functional dependencies tracking support Rafael J. Wysocki
2016-09-16 7:53 ` Marek Szyprowski
2016-09-16 12:06 ` Rafael J. Wysocki
2016-09-16 12:33 ` [Update][RFC/RFT][PATCH " Rafael J. Wysocki
2016-09-19 22:46 ` Lukas Wunner
2016-09-23 13:03 ` Lukas Wunner
2016-09-23 13:42 ` Rafael J. Wysocki
2016-09-26 16:51 ` Lukas Wunner
2016-09-27 12:16 ` Rafael J. Wysocki
2016-09-27 8:54 ` Lukas Wunner
2016-09-27 11:52 ` Rafael J. Wysocki
2016-09-28 10:43 ` Lukas Wunner
2016-09-28 11:31 ` Rafael J. Wysocki
2016-09-29 10:36 ` Lukas Wunner
2016-09-15 22:06 ` [RFC/RFT][PATCH v3 3/5] PM / sleep: Make async suspend/resume of devices use device links Rafael J. Wysocki
2016-09-15 22:07 ` [RFC/RFT][PATCH v3 4/5] PM / runtime: Use " Rafael J. Wysocki
2016-09-15 22:07 ` [RFC/RFT][PATCH v3 5/5] PM / runtime: Optimize the use of " Rafael J. Wysocki
2016-09-16 7:25 ` [RFC/RFT][PATCH v3 0/5] Functional dependencies between devices Marek Szyprowski
2016-09-16 7:57 ` Marek Szyprowski
2016-09-16 12:04 ` Rafael J. Wysocki
2016-09-27 12:34 ` Lukas Wunner
2016-09-28 0:33 ` Rafael J. Wysocki
2016-09-28 11:42 ` Lukas Wunner
2016-09-29 0:51 ` Rafael J. Wysocki
2016-11-15 18:50 ` Lukas Wunner
2016-09-29 0:24 ` [PATCH v4 " Rafael J. Wysocki
2016-09-29 0:25 ` [Resend][PATCH v4 1/5] driver core: Add a wrapper around __device_release_driver() Rafael J. Wysocki
2016-09-29 0:38 ` [PATCH v4 2/5] driver core: Functional dependencies tracking support Rafael J. Wysocki
2016-10-01 7:43 ` Lukas Wunner
2016-10-01 23:32 ` Rafael J. Wysocki
2016-09-29 0:38 ` [Resend][PATCH v4 3/5] PM / sleep: Make async suspend/resume of devices use device links Rafael J. Wysocki
2016-09-29 0:40 ` [PATCH v4 4/5] PM / runtime: Use " Rafael J. Wysocki
2016-09-29 0:41 ` [Rebase][PATCH v4 5/5] PM / runtime: Optimize the use of " Rafael J. Wysocki
2016-09-29 6:58 ` [PATCH v4 0/5] Functional dependencies between devices Marek Szyprowski
2016-09-29 12:27 ` Rafael J. Wysocki
2016-10-02 23:13 ` Lukas Wunner
2016-10-10 12:36 ` [PATCH v5 " Rafael J. Wysocki
2016-10-10 12:37 ` [Resend][PATCH v5 1/5] driver core: Add a wrapper around __device_release_driver() Rafael J. Wysocki
2016-10-10 12:51 ` [PATCH v5 2/5] driver core: Functional dependencies tracking support Rafael J. Wysocki
2016-10-26 11:19 ` Lukas Wunner
2016-10-27 15:25 ` Greg Kroah-Hartman
2016-10-28 9:57 ` Lukas Wunner
2016-11-07 21:22 ` Luis R. Rodriguez
2016-11-08 6:45 ` Greg Kroah-Hartman
2016-11-08 19:21 ` Luis R. Rodriguez
2016-11-08 19:43 ` Greg Kroah-Hartman
2016-11-08 20:58 ` Luis R. Rodriguez
2016-11-09 6:45 ` Greg Kroah-Hartman
2016-11-09 9:36 ` Andrzej Hajda
2016-11-09 9:41 ` Greg Kroah-Hartman
2016-11-13 16:58 ` Lukas Wunner
2016-11-10 0:43 ` Rafael J. Wysocki
2016-11-10 0:59 ` Luis R. Rodriguez
2016-11-10 7:14 ` Laurent Pinchart
2016-11-10 22:04 ` Luis R. Rodriguez
2016-11-10 22:40 ` Greg Kroah-Hartman
2016-11-11 0:08 ` Laurent Pinchart
2016-11-13 10:59 ` Greg Kroah-Hartman
2016-11-14 14:50 ` Luis R. Rodriguez
2016-11-14 8:15 ` Geert Uytterhoeven
2016-11-10 8:46 ` Geert Uytterhoeven
2016-11-10 22:12 ` Luis R. Rodriguez
2016-10-27 15:32 ` Greg Kroah-Hartman
2016-11-07 21:39 ` Luis R. Rodriguez
2016-11-10 1:07 ` Rafael J. Wysocki
2016-11-10 7:05 ` Laurent Pinchart
2016-11-10 23:09 ` Luis R. Rodriguez
2016-11-13 17:34 ` Lukas Wunner
2016-11-14 13:48 ` Luis R. Rodriguez
2016-11-14 15:48 ` Lukas Wunner
2016-11-14 16:00 ` Luis R. Rodriguez
2016-10-10 12:54 ` [PATCH v5 3/5] PM / sleep: Make async suspend/resume of devices use device links Rafael J. Wysocki
2016-10-10 12:56 ` [PATCH v5 4/5] PM / runtime: Use " Rafael J. Wysocki
2016-10-20 13:17 ` [Update][PATCH " Rafael J. Wysocki
2016-10-10 12:57 ` [Rebase][PATCH v5 5/5] PM / runtime: Optimize the use of " Rafael J. Wysocki
2016-10-18 10:46 ` [PATCH v5 0/5] Functional dependencies between devices Marek Szyprowski
2016-10-19 11:57 ` Rafael J. Wysocki
2016-10-20 10:21 ` Marek Szyprowski
2016-10-20 12:54 ` Rafael J. Wysocki
2016-10-27 15:32 ` Greg Kroah-Hartman
[not found] ` <5811F0CF.5000204@huawei.com>
2016-10-28 9:39 ` Lukas Wunner
2016-11-02 20:55 ` Hanjun Guo
2016-10-30 16:22 ` [PATCH v6 " Rafael J. Wysocki
2016-10-30 16:28 ` [Resend][PATCH v6 3/5] PM / sleep: Make async suspend/resume of devices use device links Rafael J. Wysocki
2016-10-30 16:29 ` [Resend][PATCH v6 1/5] driver core: Add a wrapper around __device_release_driver() Rafael J. Wysocki
2016-10-30 16:32 ` [PATCH v6 2/5] driver core: Functional dependencies tracking support Rafael J. Wysocki
2016-10-30 16:32 ` [PATCH v6 4/5] PM / runtime: Use device links Rafael J. Wysocki
2016-12-18 14:01 ` Lukas Wunner
2016-12-18 15:53 ` Rafael J. Wysocki
2016-12-18 16:37 ` Lukas Wunner
2016-12-19 12:38 ` Rafael J. Wysocki
2016-10-30 16:32 ` [Resend][PATCH v6 5/5] PM / runtime: Optimize the use of " Rafael J. Wysocki
2016-10-30 16:40 ` [PATCH v6 0/5] Functional dependencies between devices Rafael J. Wysocki
2016-10-31 17:47 ` Greg Kroah-Hartman
2016-11-01 3:50 ` Rafael J. Wysocki
2016-11-02 7:58 ` Marek Szyprowski
2016-11-05 12:10 ` Greg Kroah-Hartman
2016-11-07 21:15 ` Luis R. Rodriguez
2016-11-08 6:36 ` Marek Szyprowski
2016-11-08 20:14 ` Luis R. Rodriguez
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