From patchwork Tue Oct 24 15:17:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King \(Oracle\)" X-Patchwork-Id: 738109 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DBC96C25B6F for ; Tue, 24 Oct 2023 15:19:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343671AbjJXPTq (ORCPT ); Tue, 24 Oct 2023 11:19:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34568 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343890AbjJXPTN (ORCPT ); Tue, 24 Oct 2023 11:19:13 -0400 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:32c8:5054:ff:fe00:142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ECF562128; Tue, 24 Oct 2023 08:17:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=SgaIaYS3mtaQ+QUCe4AANBoYkmS3pY+YPMpHbZi7M0w=; b=OjWEStoZKar7qIzZyCm/2y1rGG PNNCmIKMgH8spn8dezjGUqFkaGbJMcwgN5UNGVF+4hOxqWfFJWT8vDJiaI3x48lVFUlZcrpLFNNHR hobywJT8IU0kTsztabCHblA0pRq0PeDBsaLh9E8pYZHce+8Z1GjESNLe1v9RDnz49y1XzQ1XRpsof Q7FeT5jkOwvdSrPmfq/HOGN1IkbSFiHt5fjLo+UprkNS7XXz7JM0TBiBDY5J3wEcwDGYlVqGs1GLK amltgoplVn/TaBDkb8DtPZ9WMd9WGi5GSpdxSm1aCp5hThu3IAY3MQYsT65ew5cWLxMdDo8ZXFON1 Cc04V2Uw==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:33462 helo=rmk-PC.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1qvJA4-0004RB-1O; Tue, 24 Oct 2023 16:17:40 +0100 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1qvJA5-00AqQa-TL; Tue, 24 Oct 2023 16:17:41 +0100 In-Reply-To: References: From: Russell King (Oracle) To: linux-pm@vger.kernel.org, loongarch@lists.linux.dev, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, kvmarm@lists.linux.dev, x86@kernel.org, linux-csky@vger.kernel.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org Cc: Salil Mehta , Jean-Philippe Brucker , jianyong.wu@arm.com, justin.he@arm.com, James Morse , "Rafael J. Wysocki" , Len Brown Subject: [PATCH 18/39] ACPI: Only enumerate enabled (or functional) devices MIME-Version: 1.0 Content-Disposition: inline Message-Id: Sender: Russell King Date: Tue, 24 Oct 2023 16:17:41 +0100 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: James Morse Today the ACPI enumeration code 'visits' all devices that are present. This is a problem for arm64, where CPUs are always present, but not always enabled. When a device-check occurs because the firmware-policy has changed and a CPU is now enabled, the following error occurs: | acpi ACPI0007:48: Enumeration failure This is ultimately because acpi_dev_ready_for_enumeration() returns true for a device that is not enabled. The ACPI Processor driver will not register such CPUs as they are not 'decoding their resources'. Change acpi_dev_ready_for_enumeration() to also check the enabled bit. ACPI allows a device to be functional instead of maintaining the present and enabled bit. Make this behaviour an explicit check with a reference to the spec, and then check the present and enabled bits. This is needed to avoid enumerating present && functional devices that are not enabled. Signed-off-by: James Morse Signed-off-by: Russell King (Oracle) --- If this change causes problems on deployed hardware, I suggest an arch opt-in: ACPI_IGNORE_STA_ENABLED, that causes acpi_dev_ready_for_enumeration() to only check the present bit. Changes since RFC v2: * Incorporate comment suggestion by Gavin Shan. Other review comments from Jonathan Cameron not yet addressed. --- drivers/acpi/device_pm.c | 2 +- drivers/acpi/device_sysfs.c | 2 +- drivers/acpi/internal.h | 1 - drivers/acpi/property.c | 2 +- drivers/acpi/scan.c | 24 ++++++++++++++---------- 5 files changed, 17 insertions(+), 14 deletions(-) diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index f007116a8427..76c38478a502 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -313,7 +313,7 @@ int acpi_bus_init_power(struct acpi_device *device) return -EINVAL; device->power.state = ACPI_STATE_UNKNOWN; - if (!acpi_device_is_present(device)) { + if (!acpi_dev_ready_for_enumeration(device)) { device->flags.initialized = false; return -ENXIO; } diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c index b9bbf0746199..16e586d74aa2 100644 --- a/drivers/acpi/device_sysfs.c +++ b/drivers/acpi/device_sysfs.c @@ -141,7 +141,7 @@ static int create_pnp_modalias(const struct acpi_device *acpi_dev, char *modalia struct acpi_hardware_id *id; /* Avoid unnecessarily loading modules for non present devices. */ - if (!acpi_device_is_present(acpi_dev)) + if (!acpi_dev_ready_for_enumeration(acpi_dev)) return 0; /* diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index 866c7c4ed233..a1b45e345bcc 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -107,7 +107,6 @@ int acpi_device_setup_files(struct acpi_device *dev); void acpi_device_remove_files(struct acpi_device *dev); void acpi_device_add_finalize(struct acpi_device *device); void acpi_free_pnp_ids(struct acpi_device_pnp *pnp); -bool acpi_device_is_present(const struct acpi_device *adev); bool acpi_device_is_battery(struct acpi_device *adev); bool acpi_device_is_first_physical_node(struct acpi_device *adev, const struct device *dev); diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c index 413e4fcadcaf..e03f00b98701 100644 --- a/drivers/acpi/property.c +++ b/drivers/acpi/property.c @@ -1418,7 +1418,7 @@ static bool acpi_fwnode_device_is_available(const struct fwnode_handle *fwnode) if (!is_acpi_device_node(fwnode)) return false; - return acpi_device_is_present(to_acpi_device_node(fwnode)); + return acpi_dev_ready_for_enumeration(to_acpi_device_node(fwnode)); } static const void * diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 17ab875a7d4e..06e9bb4a633f 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -304,7 +304,7 @@ static int acpi_scan_device_check(struct acpi_device *adev) int error; acpi_bus_get_status(adev); - if (acpi_device_is_present(adev)) { + if (acpi_dev_ready_for_enumeration(adev)) { /* * This function is only called for device objects for which * matching scan handlers exist. The only situation in which @@ -338,7 +338,7 @@ static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used) int error; acpi_bus_get_status(adev); - if (!acpi_device_is_present(adev)) { + if (!acpi_dev_ready_for_enumeration(adev)) { acpi_scan_device_not_enumerated(adev); return 0; } @@ -1908,11 +1908,6 @@ static bool acpi_device_should_be_hidden(acpi_handle handle) return true; } -bool acpi_device_is_present(const struct acpi_device *adev) -{ - return adev->status.present || adev->status.functional; -} - static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, const char *idstr, const struct acpi_device_id **matchid) @@ -2375,16 +2370,25 @@ EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies); * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration * @device: Pointer to the &struct acpi_device to check * - * Check if the device is present and has no unmet dependencies. + * Check if the device is functional or enabled and has no unmet dependencies. * - * Return true if the device is ready for enumeratino. Otherwise, return false. + * Return true if the device is ready for enumeration. Otherwise, return false. */ bool acpi_dev_ready_for_enumeration(const struct acpi_device *device) { if (device->flags.honor_deps && device->dep_unmet) return false; - return acpi_device_is_present(device); + /* + * ACPI 6.5's 6.3.7 "_STA (Device Status)" allows firmware to return + * (!present && functional) for certain types of devices that should be + * enumerated. Note that the enabled bit can't be sert until the present + * bit is set. + */ + if (device->status.present) + return device->status.enabled; + else + return device->status.functional; } EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);