From patchwork Tue Mar 28 04:51:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dexuan Cui X-Patchwork-Id: 13190482 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 CEF83C77B60 for ; Tue, 28 Mar 2023 04:54:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232102AbjC1EyU (ORCPT ); Tue, 28 Mar 2023 00:54:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60874 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232287AbjC1EyB (ORCPT ); Tue, 28 Mar 2023 00:54:01 -0400 Received: from DM6FTOPR00CU001.outbound.protection.outlook.com (mail-cusazon11020018.outbound.protection.outlook.com [52.101.61.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84139359B; Mon, 27 Mar 2023 21:53:27 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=mSOg86jc0Hp9KYB4v/qdQss0utKoHWV2FpjI3d6rF9BGyBLU15oxoMPs1DPM0FtETYjtBAkpn3i1meJBfKA3E0UQEZVEAMDnA9OLCo5StsH3cZtydMlqfCYwhOdqQ+BEY+3cTzUDul+Q7W5LX5saE2oQt+D94jK+/WdZ9PVN/WkLcmvFNumCTJZfqC+vDmxEYSZRD5en4LIRsp4L0ssKkJ0E+g9vYNmMVaZ/jvMPNAf3beCAsbuxDvYj3L/Cxm/JtaVMRr06A188BBdWXTcG9eFoo0wvGEg7yZwKXmMG6XVMXS6A/XSpsoE9582lKQ5uEXzsm0DYduLdHNiqLoKgSQ== 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=ZXf8oCsuD4692IF7aE7rV9LfnreLFzYWT+HaqSiheDY=; b=Rbd68lbuiAUD+jxO3RzOhBFfW3pfoKmySJNVzyNNyLgmqIdnoFqNkx3I/BSZWYF5Dyb69/i47i5wMg+G2sz4Rd5LxsKxURO1eBGZ9X2i2iG0eVjCqYVuVJIhRReIIc4gv8L548Z6pmgBQQBpbpdGeVaMrht642M9cenxkAF6gpxoLXAfqUqKIxr8zmL9RS7+exH3X1fno4a7sSqJdjS9YAKGHtM5VhMs2x0y2Pt43+WIJw09NGGO1HnPXQjaePfO4BBN4n55djlO2DVyh7knvs2jAyvPXMSEVmEKAlncRnrCAMVVcxenxuX/1Np1RdJKrcmoKddHPXoHGQs2p2DdfQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=microsoft.com; dmarc=pass action=none header.from=microsoft.com; dkim=pass header.d=microsoft.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ZXf8oCsuD4692IF7aE7rV9LfnreLFzYWT+HaqSiheDY=; b=ibVMLhbb89Z7cxPoT5Mw60Sc5GuhxH1lBvusouw6g12aiSa6Aop548Zimx6ES7Rn6z1JyHqVvCWffsNx6XfOD3sx/X3ETGklloNFJ5tI2alr1fFXOkbhx6nt+cvGN0idLMtPuvpkG8KcxHWMd8DiT0FBXKVjzML4a2yme0Zl7rU= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microsoft.com; Received: from BL0PR2101MB1092.namprd21.prod.outlook.com (2603:10b6:207:30::23) by IA1PR21MB3402.namprd21.prod.outlook.com (2603:10b6:208:3e1::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6277.6; Tue, 28 Mar 2023 04:53:17 +0000 Received: from BL0PR2101MB1092.namprd21.prod.outlook.com ([fe80::97b2:25ca:c44:9b7]) by BL0PR2101MB1092.namprd21.prod.outlook.com ([fe80::97b2:25ca:c44:9b7%6]) with mapi id 15.20.6277.005; Tue, 28 Mar 2023 04:53:16 +0000 From: Dexuan Cui To: bhelgaas@google.com, davem@davemloft.net, decui@microsoft.com, edumazet@google.com, haiyangz@microsoft.com, jakeo@microsoft.com, kuba@kernel.org, kw@linux.com, kys@microsoft.com, leon@kernel.org, linux-pci@vger.kernel.org, lpieralisi@kernel.org, mikelley@microsoft.com, pabeni@redhat.com, robh@kernel.org, saeedm@nvidia.com, wei.liu@kernel.org, longli@microsoft.com, boqun.feng@gmail.com Cc: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 6/6] PCI: hv: Use async probing to reduce boot time Date: Mon, 27 Mar 2023 21:51:22 -0700 Message-Id: <20230328045122.25850-7-decui@microsoft.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230328045122.25850-1-decui@microsoft.com> References: <20230328045122.25850-1-decui@microsoft.com> X-ClientProxiedBy: MW4PR03CA0013.namprd03.prod.outlook.com (2603:10b6:303:8f::18) To BL0PR2101MB1092.namprd21.prod.outlook.com (2603:10b6:207:30::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL0PR2101MB1092:EE_|IA1PR21MB3402:EE_ X-MS-Office365-Filtering-Correlation-Id: bc1fdca0-8564-407e-156c-08db2f48583f 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BL0PR2101MB1092.namprd21.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(4636009)(346002)(376002)(366004)(396003)(39860400002)(136003)(451199021)(478600001)(83380400001)(10290500003)(2906002)(1076003)(38100700002)(52116002)(7416002)(6486002)(6506007)(6512007)(921005)(2616005)(5660300002)(8936002)(6666004)(316002)(86362001)(82960400001)(82950400001)(186003)(41300700001)(66556008)(66476007)(4326008)(66946007)(8676002)(36756003);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: bc1fdca0-8564-407e-156c-08db2f48583f X-MS-Exchange-CrossTenant-AuthSource: BL0PR2101MB1092.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Mar 2023 04:53:16.8783 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 2zPvkLu+Qnetj1B4AXe4Ub1pBDFvZqDsmESES7EyKF7lFLhzGcnoXQYXRj+f0WIxgJf6hY7W6md3COMLKD+lBQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR21MB3402 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Commit 414428c5da1c ("PCI: hv: Lock PCI bus on device eject") added the pci_lock_rescan_remove() and pci_unlock_rescan_remove() to address the race between create_root_hv_pci_bus() and hv_eject_device_work(), but it doesn't really work well. Now with hbus->state_lock and other fixes, the race is resolved, so remove pci_{lock,unlock}_rescan_remove(). Also enable async probing to reduce boot time. Signed-off-by: Dexuan Cui --- drivers/pci/controller/pci-hyperv.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index 2c0b86b20408..08ab389e27cc 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -2312,12 +2312,16 @@ static int create_root_hv_pci_bus(struct hv_pcibus_device *hbus) if (error) return error; - pci_lock_rescan_remove(); + /* + * pci_lock_rescan_remove() and pci_unlock_rescan_remove() are + * unnecessary here, because we hold the hbus->state_lock, meaning + * hv_eject_device_work() and pci_devices_present_work() can't race + * with create_root_hv_pci_bus(). + */ hv_pci_assign_numa_node(hbus); pci_bus_assign_resources(bridge->bus); hv_pci_assign_slots(hbus); pci_bus_add_devices(bridge->bus); - pci_unlock_rescan_remove(); hbus->state = hv_pcibus_installed; return 0; } @@ -4003,6 +4007,9 @@ static struct hv_driver hv_pci_drv = { .remove = hv_pci_remove, .suspend = hv_pci_suspend, .resume = hv_pci_resume, + .driver = { + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, }; static void __exit exit_hv_pci_drv(void)