From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Tue, 18 Feb 2025 20:13:09 +0000 (+0100)
Subject: PM: runtime: Introduce pm_runtime_blocked()
X-Git-Tag: v6.15-rc1~191^2~1^2~17
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=758cc55ce3d5d79e8f98adbd03ad2cd29133af33;p=thirdparty%2Fkernel%2Flinux.git

PM: runtime: Introduce pm_runtime_blocked()

Introduce a new helper function called pm_runtime_blocked()
for checking the power.last_status value indicating whether or not
enabling runtime PM for the given device has been blocked (which
happens in the "prepare" phase of system-wide suspend if runtime
PM is disabled for the given device at that point).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://patch.msgid.link/4632087.LvFx2qVVIh@rjwysocki.net
---

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 797ea38ceba7d..c0f5a9f892997 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1555,6 +1555,23 @@ out:
 }
 EXPORT_SYMBOL_GPL(pm_runtime_enable);
 
+bool pm_runtime_blocked(struct device *dev)
+{
+	bool ret;
+
+	/*
+	 * dev->power.last_status is a bit field, so in case it is updated via
+	 * RMW, read it under the spin lock.
+	 */
+	spin_lock_irq(&dev->power.lock);
+
+	ret = dev->power.last_status == RPM_BLOCKED;
+
+	spin_unlock_irq(&dev->power.lock);
+
+	return ret;
+}
+
 static void pm_runtime_disable_action(void *data)
 {
 	pm_runtime_dont_use_autosuspend(data);
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index 10769119867b5..aea0395c10a14 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -81,6 +81,7 @@ extern void pm_runtime_block_if_disabled(struct device *dev);
 extern void pm_runtime_unblock(struct device *dev);
 extern void pm_runtime_enable(struct device *dev);
 extern void __pm_runtime_disable(struct device *dev, bool check_resume);
+extern bool pm_runtime_blocked(struct device *dev);
 extern void pm_runtime_allow(struct device *dev);
 extern void pm_runtime_forbid(struct device *dev);
 extern void pm_runtime_no_callbacks(struct device *dev);
@@ -277,6 +278,7 @@ static inline void pm_runtime_block_if_disabled(struct device *dev) {}
 static inline void pm_runtime_unblock(struct device *dev) {}
 static inline void pm_runtime_enable(struct device *dev) {}
 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
+static inline bool pm_runtime_blocked(struct device *dev) { return true; }
 static inline void pm_runtime_allow(struct device *dev) {}
 static inline void pm_runtime_forbid(struct device *dev) {}