From patchwork Fri Jan 20 09:15:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vidya Sagar X-Patchwork-Id: 46228 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:eb09:0:0:0:0:0 with SMTP id s9csp96177wrn; Fri, 20 Jan 2023 01:17:56 -0800 (PST) X-Google-Smtp-Source: AMrXdXvzPFcmBiPLJC6I3WepM0xKuNt0HlSAMwW++S23ep+eX04YSay3HeUqdzssrNQgDf22K+fP X-Received: by 2002:a05:6402:524f:b0:490:47c3:3d7f with SMTP id t15-20020a056402524f00b0049047c33d7fmr19430292edd.2.1674206276118; Fri, 20 Jan 2023 01:17:56 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1674206276; cv=pass; d=google.com; s=arc-20160816; b=CMqWgiOZdsffEq07FKTZhUK7VUFgUjeI/cXNsSPFmsaTAkqnp1DkPaSk5DYvZlFuL8 psWWhrAZAY03LPYDwmyaAJwrMdl5aDgoVvhJtdO4+Ix1cZuBclvxPWccTNiwnjvYA83k rcGJJR799kYV0UbDV3GvIP57R/NqyCTkfUH22VOUcizEyebRTbBpWgVkJlYM7fapFQ8Z wmbnlSHcXuZ6DwJsxUXIgEDeh6mHkiHPSiN3ST9bc3QN8udY5xnYh3ql0tKPcBhgdCdf 5vaY+WkqkH/M6nyhPNiqZv2e1TuBuW28ZrlsOY+b0mhOoSiZDv7T+SzCHWB6hbUJnwk5 s5xA== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=y/XRqw8pSYYNuJH25BnLnvNDDvANusGXglmfcHQRjQg=; b=vPJiqgLfROCKmvOvS7mo4zxBY7O4gE0+KiOSuC8WFkCNbYZwsiFFTqFaAYhioCa+fr AD4jnAHwl9DyPS38vTNBD73uho2hlyid1X7HMT4lsM7JPjFOS083wrryA3HX4Nlu85Cx 9txtv3qKkvYl3DGgNGu3xuYF9cmQ6/9uX7fnpjbuUKXXEXHGsLxNhEjgBiVaKhIzB+Gk th8+Fzo4QBLv6yD5PXZxJz7aMYmL8bexHIWbmYVfjzZGSXwPYe9mbWbzptK+yoEB80ZE LqRtJqtzft8/SLQcSLx7Z+6M1Tfrx5tgR/LjXCqjqNLu59vIXDr6ViZwRGp+nbawTCFe Sw2g== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@Nvidia.com header.s=selector2 header.b=ZVzp0HgL; arc=pass (i=1 spf=pass spfdomain=nvidia.com dmarc=pass fromdomain=nvidia.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=nvidia.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id t14-20020a056402524e00b0049e2d2eb5aesi15768729edd.229.2023.01.20.01.17.32; Fri, 20 Jan 2023 01:17:56 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@Nvidia.com header.s=selector2 header.b=ZVzp0HgL; arc=pass (i=1 spf=pass spfdomain=nvidia.com dmarc=pass fromdomain=nvidia.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=nvidia.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229984AbjATJQm (ORCPT + 99 others); Fri, 20 Jan 2023 04:16:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57750 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229888AbjATJQk (ORCPT ); Fri, 20 Jan 2023 04:16:40 -0500 Received: from NAM10-BN7-obe.outbound.protection.outlook.com (mail-bn7nam10on2073.outbound.protection.outlook.com [40.107.92.73]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8B0559574F; Fri, 20 Jan 2023 01:16:15 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=ebWCwISwP3DxV4kF4lSWfa3UNl7GJzMa9EMhj5iipdXW0LGSblDkh8RcXQlOd2aEyWwcJYYKKrKf/gokY0CzWT48UKCZZvVsINrYt7fn3Eij1gkWVQ/f5QL8q8E3+rUBYHHoBQP9HAWGQQiNJLMLpp3JpDHcFoNsYDBwgC7/DFdV+2ebHGzjE3qPAnr6nKcMxShC34mrp6LSIP3NaZ/280fUUmEjtXOkoaRN1K+ni5BMWN6wIspMcNdPWzt+th/xnX5L6tLgkQyYJom1GdsYULwVrJCnFel1XaVdCM/XeNbcqUFeUKGIfcg4wXsuUz2FgD5PHaa04Y4AJwWihvOJrA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=y/XRqw8pSYYNuJH25BnLnvNDDvANusGXglmfcHQRjQg=; b=f0RKYAIOLIPlV5zuSeHVLhuzO11mVVIw9IUIvgLwviyC2rsTqHbGExei6k/z4oCqUAO48MADB7rPyzUd+HzXZG5Zm5huS61n7xvtiDFaJKPuZVGTm6NLl0CRz4Zdguiuu7XLdxz0gJmxrwNrkD78UQ8dW5dq7wqITsRpiFKFZTMJ9+lBs7742dZ7j5zZ4G9dUhwc69OhbBVxw2awrl41Csxt9pHC2Deuyn7d8r46EK0HJvAZyLgyNrpgBaYBEHZFkVom6uZKWPvCvP5LD4iumVBGg9ltCTjhMdQzU2y9Lro+rZc7ghPXUPssjdRW7znsVG0RFPg7kzk7aI9mKUNXUA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.118.233) smtp.rcpttodomain=google.com smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=y/XRqw8pSYYNuJH25BnLnvNDDvANusGXglmfcHQRjQg=; b=ZVzp0HgLlQYHhFiiIeIolrpSZbY2vpf8rntVdW/QuJWKnwBrjWgEdqnRtEvy1IPuKmyku5QmwCugCU4APw+g/bXv1VpeB/4y4jjhaIyIw92E9L90ET7oM+tlrhXTS1rAim/+XjolNxtkGlQmkD4abRQPzQbgnj3VGjJVV1AUtgclUPTp2LnMHJ8/mXM6j4GCU5Fyc/Qg19lz1ssMcB1zDWOvLtbAJfP+BbSu2fZumqSbmgOdMQ9SrBdXCk7jVxYOIJAyCp65EG+z04+4DHApn62CfO9unY/j4wKa8+u7HEJpJY5F/QiSPIO4mLZr6/gIwtJIEpnDWm51Ti8bJaJYSQ== Received: from DS7PR03CA0202.namprd03.prod.outlook.com (2603:10b6:5:3b6::27) by PH7PR12MB7163.namprd12.prod.outlook.com (2603:10b6:510:202::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.27; Fri, 20 Jan 2023 09:16:00 +0000 Received: from DM6NAM11FT018.eop-nam11.prod.protection.outlook.com (2603:10b6:5:3b6:cafe::a7) by DS7PR03CA0202.outlook.office365.com (2603:10b6:5:3b6::27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.27 via Frontend Transport; Fri, 20 Jan 2023 09:16:00 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.118.233) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.118.233 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.118.233; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.118.233) by DM6NAM11FT018.mail.protection.outlook.com (10.13.172.110) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6023.16 via Frontend Transport; Fri, 20 Jan 2023 09:16:00 +0000 Received: from drhqmail201.nvidia.com (10.126.190.180) by mail.nvidia.com (10.127.129.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Fri, 20 Jan 2023 01:15:52 -0800 Received: from drhqmail201.nvidia.com (10.126.190.180) by drhqmail201.nvidia.com (10.126.190.180) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Fri, 20 Jan 2023 01:15:51 -0800 Received: from vidyas-desktop.nvidia.com (10.127.8.9) by mail.nvidia.com (10.126.190.180) with Microsoft SMTP Server id 15.2.986.36 via Frontend Transport; Fri, 20 Jan 2023 01:15:48 -0800 From: Vidya Sagar To: , , , , , CC: , , , , , , , Subject: [PATCH V2] PCI/ASPM: Skip L1SS save/restore if not already enabled Date: Fri, 20 Jan 2023 14:45:40 +0530 Message-ID: <20230120091540.3305-1-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230119094913.20536-1-vidyas@nvidia.com> References: <20230119094913.20536-1-vidyas@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT018:EE_|PH7PR12MB7163:EE_ X-MS-Office365-Filtering-Correlation-Id: e0220294-ac66-42fd-5a8d-08dafac6f27e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230022)(4636009)(396003)(39860400002)(136003)(346002)(376002)(451199015)(46966006)(40470700004)(36840700001)(26005)(2906002)(186003)(54906003)(110136005)(316002)(2616005)(966005)(7696005)(36756003)(478600001)(6666004)(36860700001)(7636003)(86362001)(40460700003)(356005)(82740400003)(40480700001)(336012)(1076003)(47076005)(426003)(83380400001)(41300700001)(4326008)(5660300002)(8936002)(70206006)(70586007)(82310400005)(8676002)(32563001)(473944003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jan 2023 09:16:00.3775 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e0220294-ac66-42fd-5a8d-08dafac6f27e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT018.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7163 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1755444676794763984?= X-GMAIL-MSGID: =?utf-8?q?1755532520640410771?= Skip save and restore of ASPM L1 Sub-States specific registers if they are not already enabled in the system. This is to avoid issues observed on certain platforms during restoration process, particularly when restoring the L1SS registers contents. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=216782 Signed-off-by: Vidya Sagar Acked-by: Rafael J. Wysocki --- v2: * Address review comments from Kai-Heng Feng and Rafael drivers/pci/pcie/aspm.c | 17 ++++++++++++++++- include/linux/pci.h | 1 + 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 53a1fa306e1e..bd2a922081bd 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -761,11 +761,23 @@ void pci_save_aspm_l1ss_state(struct pci_dev *dev) { struct pci_cap_saved_state *save_state; u16 l1ss = dev->l1ss; - u32 *cap; + u32 *cap, val; if (!l1ss) return; + /* + * Skip save and restore of L1 Sub-States registers if they are not + * already enabled in the system + */ + pci_read_config_dword(dev, l1ss + PCI_L1SS_CTL1, &val); + if (!(val & PCI_L1SS_CTL1_L1SS_MASK)) { + dev->skip_l1ss_restore = true; + return; + } + + dev->skip_l1ss_restore = false; + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); if (!save_state) return; @@ -784,6 +796,9 @@ void pci_restore_aspm_l1ss_state(struct pci_dev *dev) if (!l1ss) return; + if (dev->skip_l1ss_restore) + return; + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); if (!save_state) return; diff --git a/include/linux/pci.h b/include/linux/pci.h index 22319ea71ab0..39534602b55e 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -395,6 +395,7 @@ struct pci_dev { unsigned int ltr_path:1; /* Latency Tolerance Reporting supported from root to here */ u16 l1ss; /* L1SS Capability pointer */ + bool skip_l1ss_restore; /* Skip L1SS Save/Restore */ #endif unsigned int pasid_no_tlp:1; /* PASID works without TLP Prefix */ unsigned int eetlp_prefix_path:1; /* End-to-End TLP Prefix */