From patchwork Thu Aug 19 05:45:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 12446269 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF3B2C4338F for ; Thu, 19 Aug 2021 05:46:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A3C096101A for ; Thu, 19 Aug 2021 05:46:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230494AbhHSFq4 (ORCPT ); Thu, 19 Aug 2021 01:46:56 -0400 Received: from smtp-relay-canonical-0.canonical.com ([185.125.188.120]:39428 "EHLO smtp-relay-canonical-0.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230274AbhHSFqt (ORCPT ); Thu, 19 Aug 2021 01:46:49 -0400 Received: from localhost.localdomain (1-171-223-154.dynamic-ip.hinet.net [1.171.223.154]) (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 smtp-relay-canonical-0.canonical.com (Postfix) with ESMTPSA id A35A4411C4; Thu, 19 Aug 2021 05:46:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1629351972; bh=amXsjTc2Jlr4vNYCJIJwZjbkzL6BAOEgx/TBHMTR6cU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=mu+BQpZyR3+QvkVIR2cDQdg/SvVpzcb8qsEE9hzA7aTxTTsnfkzzm43OG91Ma+YL0 +heO9NHlrNFASy3WSyc/lfSHiXFMxB2HjwwbDvCTfyGKSxTfd1WmX0ROFw7VFB1Tvn dXeopEWwfpzfqPEFHOlaOg8nJ1uZ7s8B86FDPUKtYNgwRqn/DvU5K465hsCDjuy0wM 8OrEJN9L0L2CLiSzIl0WGMDo/X7gFb+g7PKm9Jepzw+y1JvErSCOhjaNIUP1MdumEQ 9rkanQ0Km/a+Px0wSeEfviGC3HTCyBzSijegzyZtxT0g2YFmk48QlBJd9hLKZNzTdL 0kfu76tamzPsw== From: Kai-Heng Feng To: hkallweit1@gmail.com, nic_swsd@realtek.com, bhelgaas@google.com Cc: davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Kai-Heng Feng , "Saheed O. Bolarinwa" , Vidya Sagar , Logan Gunthorpe , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= Subject: [PATCH net-next v3 2/3] PCI/ASPM: Introduce a new helper to report ASPM support status Date: Thu, 19 Aug 2021 13:45:41 +0800 Message-Id: <20210819054542.608745-3-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210819054542.608745-1-kai.heng.feng@canonical.com> References: <20210819054542.608745-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Introduce a new helper, pcie_aspm_supported(), to report ASPM support status. The user will be introduced by next patch. Signed-off-by: Kai-Heng Feng --- v3: - This is a new patch drivers/pci/pcie/aspm.c | 11 +++++++++++ include/linux/pci.h | 2 ++ 2 files changed, 13 insertions(+) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 013a47f587cea..eeea6a04ab0cf 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -1201,6 +1201,17 @@ bool pcie_aspm_enabled(struct pci_dev *pdev) } EXPORT_SYMBOL_GPL(pcie_aspm_enabled); +bool pcie_aspm_supported(struct pci_dev *pdev) +{ + struct pcie_link_state *link = pcie_aspm_get_link(pdev); + + if (!link) + return false; + + return link->aspm_support; +} +EXPORT_SYMBOL_GPL(pcie_aspm_supported); + static ssize_t aspm_attr_show_common(struct device *dev, struct device_attribute *attr, char *buf, u8 state) diff --git a/include/linux/pci.h b/include/linux/pci.h index 540b377ca8f61..b7b71982f2405 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1602,6 +1602,7 @@ int pci_disable_link_state_locked(struct pci_dev *pdev, int state); void pcie_no_aspm(void); bool pcie_aspm_support_enabled(void); bool pcie_aspm_enabled(struct pci_dev *pdev); +bool pcie_aspm_supported(struct pci_dev *pdev); #else static inline int pci_disable_link_state(struct pci_dev *pdev, int state) { return 0; } @@ -1610,6 +1611,7 @@ static inline int pci_disable_link_state_locked(struct pci_dev *pdev, int state) static inline void pcie_no_aspm(void) { } static inline bool pcie_aspm_support_enabled(void) { return false; } static inline bool pcie_aspm_enabled(struct pci_dev *pdev) { return false; } +static inline bool pcie_aspm_supported(struct pci_dev *pdev) { return false; } #endif #ifdef CONFIG_PCIEAER