From patchwork Tue Feb 21 02:32:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 13147262 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 854D6C64EC4 for ; Tue, 21 Feb 2023 02:33:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232808AbjBUCdw (ORCPT ); Mon, 20 Feb 2023 21:33:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34684 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232613AbjBUCdv (ORCPT ); Mon, 20 Feb 2023 21:33:51 -0500 Received: from smtp-relay-canonical-0.canonical.com (smtp-relay-canonical-0.canonical.com [185.125.188.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 967E414202; Mon, 20 Feb 2023 18:33:49 -0800 (PST) Received: from localhost.localdomain (unknown [10.101.196.174]) (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 B9137405FF; Tue, 21 Feb 2023 02:33:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1676946828; bh=VxzDHiK0+rolY+k286CzRqUyRlnpqBJ10GA9uRWnSf0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Ts/zeIPQLdYEfw+0jiMZ1EKekWLkJZduqIQy01JXig+4VJYPrPa09WAk8WndE2lXV OFxn3iKiQdFg/FfRJR64VGpTxwbrI3D75+GZeurMw8EYpZsLxVIJ07bt6zJU2IpHHr kGqxP5JlEMWc4Xw/aeaMg9TZxFslWZ1L4n69rs38pIaAOWHCelYBm4zr97hwNp7+Y3 mOYbgj0Kdh0aUNtHgxoonVPmfXw17xfmKMeAtu9rBhhTW4VmmOIuhcbIZDjMWF1vXm CKJjdZOusRSTV27FT8HGUbVV51JYmobX0L655pETQrBXFTcoalsemM57k2kn/IvPw1 1Zk1OUIY23GSw== From: Kai-Heng Feng To: hkallweit1@gmail.com, nic_swsd@realtek.com, bhelgaas@google.com Cc: koba.ko@canonical.com, acelan.kao@canonical.com, Kai-Heng Feng , Kuppuswamy Sathyanarayanan , Vidya Sagar , "Rafael J. Wysocki" , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v8 3/6] PCI/ASPM: Add pcie_aspm_capable() helper Date: Tue, 21 Feb 2023 10:32:34 +0800 Message-Id: <20230221023237.1905536-4-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230221023237.1905536-1-kai.heng.feng@canonical.com> References: <20230221023237.1905536-1-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_capable(), to report ASPM capability. The user will be introduced by next patch. Acked-by: Bjorn Helgaas Suggested-by: Bjorn Helgaas Signed-off-by: Kai-Heng Feng --- v8: - No change. v7: - Change subject. v6: - No change. v5: - No change. v4: - Report aspm_capable instead. 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 692d6953f0970..d96bf0a362aa2 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -1199,6 +1199,17 @@ bool pcie_aspm_enabled(struct pci_dev *pdev) } EXPORT_SYMBOL_GPL(pcie_aspm_enabled); +bool pcie_aspm_capable(struct pci_dev *pdev) +{ + struct pcie_link_state *link = pcie_aspm_get_link(pdev); + + if (!link) + return false; + + return link->aspm_capable; +} +EXPORT_SYMBOL_GPL(pcie_aspm_capable); + 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 adffd65e84b4e..fd56872883e14 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1692,6 +1692,7 @@ 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_capable(struct pci_dev *pdev); #else static inline int pci_disable_link_state(struct pci_dev *pdev, int state) { return 0; } @@ -1700,6 +1701,7 @@ 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_capable(struct pci_dev *pdev) { return false; } #endif #ifdef CONFIG_PCIEAER