From patchwork Thu Aug 8 21:55:07 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 11084879 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-2.web.codeaurora.org (Postfix) with ESMTP id 2580A1709 for ; Thu, 8 Aug 2019 21:59:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1175B28826 for ; Thu, 8 Aug 2019 21:59:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 059AF28BCF; Thu, 8 Aug 2019 21:59:08 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham 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 A235228826 for ; Thu, 8 Aug 2019 21:59:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390296AbfHHV64 (ORCPT ); Thu, 8 Aug 2019 17:58:56 -0400 Received: from cloudserver094114.home.pl ([79.96.170.134]:52972 "EHLO cloudserver094114.home.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725785AbfHHV64 (ORCPT ); Thu, 8 Aug 2019 17:58:56 -0400 Received: from 79.184.254.29.ipv4.supernova.orange.pl (79.184.254.29) (HELO kreacher.localnet) by serwer1319399.home.pl (79.96.170.134) with SMTP (IdeaSmtpServer 0.83.275) id 2d19d8ad48c4b56a; Thu, 8 Aug 2019 23:58:53 +0200 From: "Rafael J. Wysocki" To: linux-nvme Cc: Keith Busch , Mario Limonciello , Kai-Heng Feng , Keith Busch , Christoph Hellwig , Sagi Grimberg , Linux PM , Linux Kernel Mailing List , Rajat Jain , Linux PCI , Bjorn Helgaas Subject: [PATCH v3 1/2] PCI: PCIe: ASPM: Introduce pcie_aspm_enabled() Date: Thu, 08 Aug 2019 23:55:07 +0200 Message-ID: <1618955.HVa0YQSOW5@kreacher> In-Reply-To: <2184247.yL3mcj2FRQ@kreacher> References: <4323ed84dd07474eab65699b4d007aaf@AUSX13MPC105.AMER.DELL.COM> <20190731221956.GB15795@localhost.localdomain> <2184247.yL3mcj2FRQ@kreacher> 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 Add a function checking whether or not PCIe ASPM has been enabled for a given device. It will be used by the NVMe driver to decide how to handle the device during system suspend. Signed-off-by: Rafael J. Wysocki Acked-by: Bjorn Helgaas --- v2 -> v3: * Make the new function return bool. * Change its name back to pcie_aspm_enabled(). * Fix kerneldoc comment formatting. -> v2: * Move the PCI/PCIe ASPM changes to a separate patch. * Add the _mask suffix to the new function name. * Add EXPORT_SYMBOL_GPL() to the new function. * Avoid adding an unnecessary blank line. --- drivers/pci/pcie/aspm.c | 20 ++++++++++++++++++++ include/linux/pci.h | 3 +++ 2 files changed, 23 insertions(+) Index: linux-pm/drivers/pci/pcie/aspm.c =================================================================== --- linux-pm.orig/drivers/pci/pcie/aspm.c +++ linux-pm/drivers/pci/pcie/aspm.c @@ -1170,6 +1170,26 @@ static int pcie_aspm_get_policy(char *bu module_param_call(policy, pcie_aspm_set_policy, pcie_aspm_get_policy, NULL, 0644); +/** + * pcie_aspm_enabled - Check if PCIe ASPM has been enabled for a device. + * @pci_device: Target device. + */ +bool pcie_aspm_enabled(struct pci_dev *pci_device) +{ + struct pci_dev *bridge = pci_upstream_bridge(pci_device); + bool ret; + + if (!bridge) + return false; + + mutex_lock(&aspm_lock); + ret = bridge->link_state ? !!bridge->link_state->aspm_enabled : false; + mutex_unlock(&aspm_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(pcie_aspm_enabled); + #ifdef CONFIG_PCIEASPM_DEBUG static ssize_t link_state_show(struct device *dev, struct device_attribute *attr, Index: linux-pm/include/linux/pci.h =================================================================== --- linux-pm.orig/include/linux/pci.h +++ linux-pm/include/linux/pci.h @@ -1567,8 +1567,11 @@ extern bool pcie_ports_native; #ifdef CONFIG_PCIEASPM bool pcie_aspm_support_enabled(void); +bool pcie_aspm_enabled(struct pci_dev *pci_device); #else static inline bool pcie_aspm_support_enabled(void) { return false; } +static inline bool pcie_aspm_enabled(struct pci_dev *pci_device) +{ return false; } #endif #ifdef CONFIG_PCIEAER