From patchwork Fri Jul 21 12:42:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 9856843 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D914860388 for ; Fri, 21 Jul 2017 12:50:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BE90F28786 for ; Fri, 21 Jul 2017 12:50:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B357F287B9; Fri, 21 Jul 2017 12:50:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0B1092879A for ; Fri, 21 Jul 2017 12:50:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752034AbdGUMuJ (ORCPT ); Fri, 21 Jul 2017 08:50:09 -0400 Received: from cloudserver094114.home.net.pl ([79.96.170.134]:52793 "EHLO cloudserver094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750777AbdGUMuH (ORCPT ); Fri, 21 Jul 2017 08:50:07 -0400 Received: from 79.184.253.199.ipv4.supernova.orange.pl (79.184.253.199) (HELO aspire.rjw.lan) by serwer1319399.home.pl (79.96.170.134) with SMTP (IdeaSmtpServer 0.82) id 40ca3be750a47a31; Fri, 21 Jul 2017 14:50:05 +0200 From: "Rafael J. Wysocki" To: Linux PCI Cc: Linux ACPI , Linux PM , LKML , Mika Westerberg , Bjorn Helgaas Subject: [PATCH 3/3] ACPI / PCI / PM: Rework acpi_pci_propagate_wakeup() Date: Fri, 21 Jul 2017 14:42:06 +0200 Message-ID: <4853865.5aRGCM4CdQ@aspire.rjw.lan> User-Agent: KMail/4.14.10 (Linux/4.12.0-rc1+; KDE/4.14.9; x86_64; ; ) In-Reply-To: <3116391.JNS1F4DjTg@aspire.rjw.lan> References: <3116391.JNS1F4DjTg@aspire.rjw.lan> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Rafael J. Wysocki The acpi_pci_propagate_wakeup() routine is there to handle cases in which PCI bridges (or PCIe ports) are expected to signal wakeup for devices below them, but currently it doesn't do that correctly. The problem is that acpi_pci_propagate_wakeup() uses acpi_pm_set_device_wakeup() for bridges and if that routine is called for multiple times to disable wakeup for the same device, it will disable it on the first invocation and the next calls will have no effect (it works analogously when called to enable wakeup, but that is not a problem). Now, say acpi_pci_propagate_wakeup() has been called for two different devices under the same bridge and it has called acpi_pm_set_device_wakeup() for that bridge each time. The bridge is now enabled to generate wakeup signals. Next, suppose that one of the devices below it resumes and acpi_pci_propagate_wakeup() is called to disable wakeup for that device. It will then call acpi_pm_set_device_wakeup() for the bridge and that will effectively disable remote wakeup for all devices under it even though some of them may still be suspended and remote wakeup may be expected to work for them. To address this (arguably theoretical) issue, allow wakeup.enable_count under struct acpi_device to grow beyond 1 in certain situations. In particular, allow that to happen in acpi_pci_propagate_wakeup() when wakeup is enabled or disabled for PCI bridges, so that wakeup is actually disabled for the bridge when all devices under it resume and not when just one of them does that. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/device_pm.c | 49 +++++++++++++++++++++++++++++------------------ drivers/pci/pci-acpi.c | 4 +-- include/acpi/acpi_bus.h | 14 +++++++++++-- 3 files changed, 45 insertions(+), 22 deletions(-) Index: linux-pm/drivers/acpi/device_pm.c =================================================================== --- linux-pm.orig/drivers/acpi/device_pm.c +++ linux-pm/drivers/acpi/device_pm.c @@ -682,19 +682,8 @@ static void acpi_pm_notify_work_func(str static DEFINE_MUTEX(acpi_wakeup_lock); -/** - * acpi_device_wakeup_enable - Enable wakeup functionality for device. - * @adev: ACPI device to enable wakeup functionality for. - * @target_state: State the system is transitioning into. - * - * Enable the GPE associated with @adev so that it can generate wakeup signals - * for the device in response to external (remote) events and enable wakeup - * power for it. - * - * Callers must ensure that @adev is a valid ACPI device node before executing - * this function. - */ -static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state) +static int __acpi_device_wakeup_enable(struct acpi_device *adev, + u32 target_state, int max_count) { struct acpi_device_wakeup *wakeup = &adev->wakeup; acpi_status status; @@ -702,8 +691,12 @@ static int acpi_device_wakeup_enable(str mutex_lock(&acpi_wakeup_lock); - if (wakeup->enable_count > 0) - goto out; + if (wakeup->enable_count > 0) { + if (wakeup->enable_count < max_count) + goto inc; + else + goto out; + } error = acpi_enable_wakeup_device_power(adev, target_state); if (error) @@ -716,6 +709,7 @@ static int acpi_device_wakeup_enable(str goto out; } +inc: wakeup->enable_count++; out: @@ -724,6 +718,23 @@ out: } /** + * acpi_device_wakeup_enable - Enable wakeup functionality for device. + * @adev: ACPI device to enable wakeup functionality for. + * @target_state: State the system is transitioning into. + * + * Enable the GPE associated with @adev so that it can generate wakeup signals + * for the device in response to external (remote) events and enable wakeup + * power for it. + * + * Callers must ensure that @adev is a valid ACPI device node before executing + * this function. + */ +static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state) +{ + return __acpi_device_wakeup_enable(adev, target_state, 1); +} + +/** * acpi_device_wakeup_disable - Disable wakeup functionality for device. * @adev: ACPI device to disable wakeup functionality for. * @@ -754,8 +765,9 @@ out: * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device. * @dev: Device to enable/disable to generate wakeup events. * @enable: Whether to enable or disable the wakeup functionality. + * @max_count: Maximum value of the enable reference counter. */ -int acpi_pm_set_device_wakeup(struct device *dev, bool enable) +int __acpi_pm_set_device_wakeup(struct device *dev, bool enable, int max_count) { struct acpi_device *adev; int error; @@ -775,13 +787,14 @@ int acpi_pm_set_device_wakeup(struct dev return 0; } - error = acpi_device_wakeup_enable(adev, acpi_target_system_state()); + error = __acpi_device_wakeup_enable(adev, acpi_target_system_state(), + max_count); if (!error) dev_dbg(dev, "Wakeup enabled by ACPI\n"); return error; } -EXPORT_SYMBOL(acpi_pm_set_device_wakeup); +EXPORT_SYMBOL(__acpi_pm_set_device_wakeup); /** * acpi_dev_pm_low_power - Put ACPI device into a low-power state. Index: linux-pm/include/acpi/acpi_bus.h =================================================================== --- linux-pm.orig/include/acpi/acpi_bus.h +++ linux-pm/include/acpi/acpi_bus.h @@ -605,7 +605,7 @@ acpi_status acpi_add_pm_notifier(struct acpi_status acpi_remove_pm_notifier(struct acpi_device *adev); bool acpi_pm_device_can_wakeup(struct device *dev); int acpi_pm_device_sleep_state(struct device *, int *, int); -int acpi_pm_set_device_wakeup(struct device *dev, bool enable); +int __acpi_pm_set_device_wakeup(struct device *dev, bool enable, int max_count); #else static inline void acpi_pm_wakeup_event(struct device *dev) { @@ -632,12 +632,22 @@ static inline int acpi_pm_device_sleep_s return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3_COLD) ? m : ACPI_STATE_D0; } -static inline int acpi_pm_set_device_wakeup(struct device *dev, bool enable) +static inline int __acpi_pm_set_device_wakeup(struct device *dev, bool enable, int max_count) { return -ENODEV; } #endif +static inline int acpi_pm_set_device_wakeup(struct device *dev, bool enable) +{ + return __acpi_pm_set_device_wakeup(dev, enable, 1); +} + +static inline int acpi_pm_set_bridge_wakeup(struct device *dev, bool enable) +{ + return __acpi_pm_set_device_wakeup(dev, enable, INT_MAX); +} + #ifdef CONFIG_ACPI_SLEEP u32 acpi_target_system_state(void); #else Index: linux-pm/drivers/pci/pci-acpi.c =================================================================== --- linux-pm.orig/drivers/pci/pci-acpi.c +++ linux-pm/drivers/pci/pci-acpi.c @@ -573,7 +573,7 @@ static int acpi_pci_propagate_wakeup(str { while (bus->parent) { if (acpi_pm_device_can_wakeup(&bus->self->dev)) - return acpi_pm_set_device_wakeup(&bus->self->dev, enable); + return acpi_pm_set_bridge_wakeup(&bus->self->dev, enable); bus = bus->parent; } @@ -581,7 +581,7 @@ static int acpi_pci_propagate_wakeup(str /* We have reached the root bus. */ if (bus->bridge) { if (acpi_pm_device_can_wakeup(bus->bridge)) - return acpi_pm_set_device_wakeup(bus->bridge, enable); + return acpi_pm_set_bridge_wakeup(bus->bridge, enable); } return 0; }