From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Linux PM list <linux-pm@vger.kernel.org>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Aaron Lu <aaron.lu@intel.com>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Ulf Hansson <ulf.hansson@linaro.org>
Subject: [RFC][PATCH 2/3] PM / runtime: Routine for checking device status during system suspend
Date: Fri, 09 May 2014 00:41:59 +0200 [thread overview]
Message-ID: <3848796.OqSGUVFgr8@vostro.rjw.lan> (raw)
In-Reply-To: <4232134.uNVe9bptuo@vostro.rjw.lan>
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Add a new helper routine, pm_runtime_enabled_and_suspended(), to
allow subsystems (or PM domains) to check the runtime PM status of
devices during system suspend (possibly to avoid resuming those
devices upfront at that time).
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/base/power/runtime.c | 27 +++++++++++++++++++++++++++
include/linux/pm_runtime.h | 2 ++
2 files changed, 29 insertions(+)
Index: linux-pm/include/linux/pm_runtime.h
===================================================================
--- linux-pm.orig/include/linux/pm_runtime.h
+++ linux-pm/include/linux/pm_runtime.h
@@ -57,6 +57,7 @@ extern unsigned long pm_runtime_autosusp
extern void pm_runtime_update_max_time_suspended(struct device *dev,
s64 delta_ns);
extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
+extern bool pm_runtime_enabled_and_suspended(struct device *dev);
extern void pm_set_direct_resume(struct device *dev, bool val);
static inline bool pm_children_suspended(struct device *dev)
@@ -175,6 +176,7 @@ static inline unsigned long pm_runtime_a
struct device *dev) { return 0; }
static inline void pm_runtime_set_memalloc_noio(struct device *dev,
bool enable){}
+static inline bool pm_runtime_enabled_and_suspended(struct device *dev) { return false; }
static inline void __set_direct_resume(struct device *dev, bool val) {}
static inline void pm_set_direct_resume(struct device *dev, bool val) {}
static inline bool pm_direct_resume_is_set(struct device *dev) { return false; }
Index: linux-pm/drivers/base/power/runtime.c
===================================================================
--- linux-pm.orig/drivers/base/power/runtime.c
+++ linux-pm/drivers/base/power/runtime.c
@@ -1196,6 +1196,33 @@ void pm_runtime_enable(struct device *de
EXPORT_SYMBOL_GPL(pm_runtime_enable);
/**
+ * pm_runtime_enabled_and_suspended - Check runtime PM status of a device.
+ * @dev: Device to handle.
+ *
+ * This routine is to be executed during system suspend only, after
+ * device_prepare() has been executed for @dev.
+ *
+ * Return false if runtime PM is disabled for the device. Otherwise, wait
+ * for pending transitions to complete and check the runtime PM status of the
+ * device after that. Return true if it is RPM_SUSPENDED.
+ */
+bool pm_runtime_enabled_and_suspended(struct device *dev)
+{
+ unsigned long flags;
+ bool ret;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+ if (dev->power.disable_depth) {
+ ret = false;
+ } else {
+ __pm_runtime_barrier(dev);
+ ret = pm_runtime_status_suspended(dev);
+ }
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+ return ret;
+}
+
+/**
* pm_runtime_forbid - Block runtime PM of a device.
* @dev: Device to handle.
*
next prev parent reply other threads:[~2014-05-08 22:26 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-14 23:12 [RFC][PATCH 0/3] PM: Mechanism to avoid resuming runtime-suspended devices during system suspend Rafael J. Wysocki
2014-01-14 23:13 ` [RFC][PATCH 1/3] PM / sleep: Flag to avoid executing suspend callbacks for devices Rafael J. Wysocki
2014-01-14 23:14 ` [RFC][PATCH 2/3] PM / runtime: Routine for checking device status during system suspend Rafael J. Wysocki
2014-01-16 13:32 ` Mika Westerberg
2014-01-16 16:07 ` [Update][RFC][PATCH " Rafael J. Wysocki
2014-01-14 23:16 ` [RFC][PATCH 3/3] ACPI / PM: Avoid resuming devices in ACPI PM domain " Rafael J. Wysocki
2014-01-15 13:57 ` [Update][RFC][PATCH " Rafael J. Wysocki
2014-02-16 23:49 ` [RFC][PATCH 0/3] PM: Mechanism to avoid resuming runtime-suspended devices " Rafael J. Wysocki
2014-02-16 23:50 ` [PATCH 1/3] PM / sleep: New flag to speed up suspend-resume of suspended devices Rafael J. Wysocki
2014-02-18 12:59 ` Ulf Hansson
2014-02-18 13:25 ` Rafael J. Wysocki
2014-02-19 17:01 ` Alan Stern
2014-02-20 1:23 ` Rafael J. Wysocki
2014-02-20 1:42 ` Rafael J. Wysocki
2014-02-20 17:03 ` Alan Stern
2014-02-24 0:00 ` Rafael J. Wysocki
2014-02-24 19:36 ` Alan Stern
2014-02-25 0:07 ` Rafael J. Wysocki
2014-02-25 17:08 ` Alan Stern
2014-02-25 23:56 ` Rafael J. Wysocki
2014-02-26 16:49 ` Alan Stern
2014-02-26 21:44 ` Rafael J. Wysocki
2014-02-26 22:17 ` Alan Stern
2014-02-26 23:13 ` Rafael J. Wysocki
2014-02-27 15:02 ` Alan Stern
2014-04-24 22:36 ` [RFC][PATCH 0/3] PM: Mechanism to avoid resuming runtime-suspended devices during system suspend, v2 Rafael J. Wysocki
2014-04-24 22:37 ` [RFC][PATCH 1/3] PM / sleep: Flags to speed up suspend-resume of runtime-suspended devices Rafael J. Wysocki
2014-05-01 21:39 ` Alan Stern
2014-05-01 23:15 ` Rafael J. Wysocki
2014-05-01 23:36 ` Rafael J. Wysocki
2014-05-02 0:04 ` Rafael J. Wysocki
2014-05-02 15:41 ` Rafael J. Wysocki
2014-05-02 18:44 ` Alan Stern
2014-05-05 0:09 ` Rafael J. Wysocki
2014-05-05 15:46 ` Alan Stern
2014-05-06 1:31 ` Rafael J. Wysocki
2014-05-06 19:31 ` Alan Stern
2014-05-07 0:36 ` Rafael J. Wysocki
2014-05-07 15:43 ` Alan Stern
2014-05-07 23:27 ` [RFC][PATCH 0/3] (was: Re: [RFC][PATCH 1/3] PM / sleep: Flags to speed up suspend-resume of runtime-suspended devices) Rafael J. Wysocki
2014-05-07 23:29 ` [RFC][PATCH 1/3] PM / sleep: Flag to speed up suspend-resume of runtime-suspended devices Rafael J. Wysocki
2014-05-08 7:49 ` Ulf Hansson
2014-05-08 10:53 ` Rafael J. Wysocki
2014-05-08 10:59 ` Ulf Hansson
2014-05-08 11:44 ` Rafael J. Wysocki
2014-05-08 12:25 ` Ulf Hansson
2014-05-08 20:02 ` Rafael J. Wysocki
2014-05-08 14:36 ` Alan Stern
2014-05-08 14:57 ` Alan Stern
2014-05-08 20:17 ` Rafael J. Wysocki
2014-05-08 21:03 ` Rafael J. Wysocki
2014-05-08 21:20 ` Alan Stern
2014-05-08 21:42 ` Rafael J. Wysocki
2014-05-08 21:50 ` Rafael J. Wysocki
2014-05-08 22:28 ` [RFC][PATCH 0/3] (was: Re: PM / sleep: Flag to speed up suspend-resume of runtime-suspended devices) Rafael J. Wysocki
2014-05-08 22:41 ` [RFC][PATCH 1/3] PM / sleep: Flag to speed up suspend-resume of runtime-suspended devices Rafael J. Wysocki
2014-05-09 7:23 ` Ulf Hansson
2014-05-09 11:33 ` Rafael J. Wysocki
2014-05-08 22:41 ` Rafael J. Wysocki [this message]
2014-05-08 22:42 ` [RFC][PATCH 3/3] ACPI / PM: Avoid resuming devices in ACPI PM domain during system suspend Rafael J. Wysocki
2014-05-09 1:52 ` [RFC][PATCH 1/3] PM / sleep: Flag to speed up suspend-resume of runtime-suspended devices Alan Stern
2014-05-09 22:49 ` Rafael J. Wysocki
2014-05-11 16:46 ` Alan Stern
2014-05-13 0:51 ` Rafael J. Wysocki
2014-05-08 21:08 ` Alan Stern
2014-05-09 22:48 ` Kevin Hilman
2014-05-10 1:38 ` Rafael J. Wysocki
2014-05-12 16:33 ` Kevin Hilman
2014-05-07 23:31 ` [Resend][PATCH 2/3] PM / runtime: Routine for checking device status during system suspend Rafael J. Wysocki
2014-05-07 23:33 ` [RFC][PATCH 3/3] ACPI / PM: Avoid resuming devices in ACPI PM domain " Rafael J. Wysocki
2014-05-08 14:59 ` Alan Stern
2014-05-08 19:40 ` Rafael J. Wysocki
2014-05-02 16:12 ` [RFC][PATCH 1/3] PM / sleep: Flags to speed up suspend-resume of runtime-suspended devices Alan Stern
2014-04-24 22:39 ` [RFC][PATCH 2/3][Resend] PM / runtime: Routine for checking device status during system suspend Rafael J. Wysocki
2014-04-25 11:28 ` Ulf Hansson
2014-04-24 22:40 ` [RFC][PATCH 3/3] ACPI / PM: Avoid resuming devices in ACPI PM domain " Rafael J. Wysocki
2014-02-16 23:51 ` [PATCH 2/3][Resend] PM / runtime: Routine for checking device status " Rafael J. Wysocki
2014-02-16 23:52 ` [PATCH 3/3] ACPI / PM: Avoid resuming devices in ACPI PM domain " Rafael J. Wysocki
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