From patchwork Fri Dec 15 11:23:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 754357 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 DCDD2250E8; Fri, 15 Dec 2023 11:34:31 +0000 (UTC) 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 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 5.4.0) id 2951e9a5c537d893; Fri, 15 Dec 2023 12:27:50 +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 36107668B1E; Fri, 15 Dec 2023 12:27:50 +0100 (CET) From: "Rafael J. Wysocki" To: Linux ACPI Cc: LKML , Zhang Rui , Srinivas Pandruvada , Michal Wilczynski , Hans de Goede , Andy Shevchenko , Mika Westerberg , Heikki Krogerus , Mario Limonciello , Daniel Drake Subject: [PATCH v1 0/3] ACPI: OSL/EC: Use spin locks without disabling interrupts Date: Fri, 15 Dec 2023 12:23:54 +0100 Message-ID: <2330034.ElGaqSPkdT@kreacher> Precedence: bulk X-Mailing-List: linux-acpi@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: gggruggvucftvghtrhhoucdtuddrgedvkedrvddtvddgvdekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufffkfgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepgeffhfdujeelhfdtgeffkeetudfhtefhhfeiteethfekvefgvdfgfeeikeeigfehnecuffhomhgrihhnpehkvghrnhgvlhdrohhrghenucfkphepudelhedrudefiedrudelrdelgeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeduleehrddufeeirdduledrleegpdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqpdhnsggprhgtphhtthhopeduuddprhgtphhtthhopehlihhnuhigqdgrtghpihesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehruhhirdiihhgrnhhgsehinhhtvghlrdgtohhmpdhrtghpthhtohepshhrihhnihhvrghsrdhprghnughruhhvrggurgeslhhinhhugidrihhnthgvlhdrtghomhdprhgtphhtthhopehmihgthhgrlhdrfihilhgtiiihnhhskhhisehinhhtvghlrdgtohhmpdhrtghpthhtohephhguvghgohgvuggvsehrvgguhhgrthdrtghomh X-DCC--Metrics: v370.home.net.pl 1024; Body=11 Fuz1=11 Fuz2=11 Hi Everyone, After https://patchwork.kernel.org/project/linux-acpi/patch/5745568.DvuYhMxLoT@kreacher/ the SCI interrupt handler is threaded, so ACPICA spin locks can be used without disabling interrupts, because they cannot be acquired from a hardirq handler running on the same CPU as any code already holding the spin lock. This patch [1/3] removes disabling interrupts from acpi_os_acquire_lock() and updates acpi_os_release_lock() accordingly. Patch [2/2] uses the observation that if acpi_handle_interrupt() can run in a threaded interrupt handler in the GPE case, it can also run in a threaded interrupt handler in the dedicated IRQ case, so it makes the EC driver use a threaded handler for the dedicated EC interrupt. Patch [3/3], in analogy with patch [1/3], uses the observation that after patch [2/2] all of the EC code runs in thread context, so it need not disable interrupts on the local CPU before acquiring a spin lock, so the EC driver is updated to operate its spin lock without disabling interrupts. Thanks!