From patchwork Tue Feb 18 20:13:09 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. 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Wysocki" To: Linux PM Cc: LKML , Alan Stern , Bjorn Helgaas , Linux PCI , Ulf Hansson , Johan Hovold , Manivannan Sadhasivam , Jon Hunter , Linux ACPI , Mika Westerberg , Andy Shevchenko Subject: [PATCH v2 2/4] PM: runtime: Introduce pm_runtime_blocked() Date: Tue, 18 Feb 2025 21:13:09 +0100 Message-ID: <4632087.LvFx2qVVIh@rjwysocki.net> In-Reply-To: <12612706.O9o76ZdvQC@rjwysocki.net> References: <12612706.O9o76ZdvQC@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CLIENT-IP: 195.136.19.94 X-CLIENT-HOSTNAME: 195.136.19.94 X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdeivddviecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfjqffogffrnfdpggftiffpkfenuceurghilhhouhhtmecuudehtdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvvefufffkjghfggfgtgesthfuredttddtjeenucfhrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqeenucggtffrrghtthgvrhhnpedvffeuiedtgfdvtddugeeujedtffetteegfeekffdvfedttddtuefhgeefvdejhfenucfkphepudelhedrudefiedrudelrdelgeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeduleehrddufeeirdduledrleegpdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpehrjhifsehrjhifhihsohgtkhhirdhnvghtpdhnsggprhgtphhtthhopeduvddprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehsthgvrhhnsehrohiflhgrnhgurdhhrghrvhgrrhgurdgvughupdhrtghpthhtohephhgvlhhgrggrsheskhgvrhhnvghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqphgtihesvhhgvghrrdhkvghrnhgvlhdrohh X-DCC--Metrics: v370.home.net.pl 1024; Body=12 Fuz1=12 Fuz2=12 From: Rafael J. Wysocki 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 Reviewed-by: Ulf Hansson --- v1 -> v2: Add the R-by, no other changes. --- drivers/base/power/runtime.c | 17 +++++++++++++++++ include/linux/pm_runtime.h | 2 ++ 2 files changed, 19 insertions(+) --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1555,6 +1555,23 @@ } 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); --- a/include/linux/pm_runtime.h +++ b/include/linux/pm_runtime.h @@ -81,6 +81,7 @@ 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_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) {}