From patchwork Mon Feb 17 20:16:43 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 13978587 X-Patchwork-Delegate: bhelgaas@google.com Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A47D219A8A; Mon, 17 Feb 2025 20:20:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=79.96.170.134 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739823604; cv=none; b=F5hFKCM3B8PrI1jgZx1XHWbuz1msjy5DI/JWmKz76FmkMRD72hQH8yyeGWmnBIY6RK6GbEDdTV06/NK3Q5pFILvR0R7z0juM4IczgwGQ666RdXsklQHCdhV/zSVJ5dpsmLo/B1QeA1ckquQQHuRs608S+ZWxLkp1gFKrXoDGLno= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739823604; c=relaxed/simple; bh=VGPxZ+UZjJjw8SEv0KgowUz43qF+U/wYeXYgZBnh1kc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=MFTcSv3+HL7EPXxFvGrb+FesErgE+L5nrXOkRwWVyCApB88jEQxON/qlU4IMeyy0L/b3sZg5+SGRlLJBjes5adUkac3+YEzGC7SZtrVCwpcrLdCBB0PQ2BFqsYhKtHPesJ/nCKAczQ76491Q5vRCa0D2u9GC+3EK5swqf9iIO44= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net; spf=pass smtp.mailfrom=rjwysocki.net; dkim=pass (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b=cpEFtdSX; arc=none smtp.client-ip=79.96.170.134 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjwysocki.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rjwysocki.net header.i=@rjwysocki.net header.b="cpEFtdSX" Received: from localhost (127.0.0.1) (HELO v370.home.net.pl) by /usr/run/smtp (/usr/run/postfix/private/idea_relay_lmtp) via UNIX with SMTP (IdeaSmtpServer 6.2.1) id 2a51783161226919; Mon, 17 Feb 2025 21:19:59 +0100 Received: from kreacher.localnet (unknown [195.136.19.94]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by cloudserver094114.home.pl (Postfix) with ESMTPSA id D891A9100B0; Mon, 17 Feb 2025 21:19:58 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=rjwysocki.net; s=dkim; t=1739823599; bh=VGPxZ+UZjJjw8SEv0KgowUz43qF+U/wYeXYgZBnh1kc=; h=From:Subject:Date; b=cpEFtdSXfOtC8SqUKToccmhl9nwVkQvr2n9gMzI7Yl71Om8FHLEQ/n4hJU9hbaRBq pAy9eCqWwbRtmly/16tayNc8gYGDCq2GW/QH/nl7nnQ4QAr9BOl2XwaZNv6qTwRyRj VAIZVaysGNoHoNRFCbk2mKwZekQxzKf+ZUv4M1w72W7MV+u1KnI/UAv9Tq+i4TM+oM nQjw4/0qFm+nMRdc7cDn5bm5p8TNl1gipeQRwR6M8X1OfIt5NNcED/3o47uRT6ST08 8k9fg+SkbNjy2NvALALZKVH/hmX8iC/LHHjrO54G/iMlxHpEhErpQoovUDgM9lCWX5 Q9DGCfRPocqNQ== From: "Rafael J. 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 v1 2/3] PM: runtime: Introduce pm_runtime_blocked() Date: Mon, 17 Feb 2025 21:16:43 +0100 Message-ID: <8497121.T7Z3S40VBb@rjwysocki.net> In-Reply-To: <4966939.GXAFRqVoOG@rjwysocki.net> References: <4966939.GXAFRqVoOG@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-pci@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: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdehleefhecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfjqffogffrnfdpggftiffpkfenuceurghilhhouhhtmecuudehtdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvvefufffkjghfggfgtgesthfuredttddtjeenucfhrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqeenucggtffrrghtthgvrhhnpedvffeuiedtgfdvtddugeeujedtffetteegfeekffdvfedttddtuefhgeefvdejhfenucfkphepudelhedrudefiedrudelrdelgeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeduleehrddufeeirdduledrleegpdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpehrjhifsehrjhifhihsohgtkhhirdhnvghtpdhnsggprhgtphhtthhopeduvddprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehsthgvrhhnsehrohiflhgrnhgurdhhrghrvhgrrhgurdgvughupdhrtghpthhtohephhgvlhhgrggrsheskhgvrhhnvghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqphgtihesvhhgvghrrdhkvghrnhgvlhdrohh 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 the enabling of 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 and has never been enabled so far). Signed-off-by: Rafael J. Wysocki Reviewed-by: Ulf Hansson --- 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 regular); +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) {}