From patchwork Fri Nov 3 16:44:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Gunthorpe X-Patchwork-Id: 13444746 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 2C77BC05021 for ; Fri, 3 Nov 2023 16:45:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345870AbjKCQpb (ORCPT ); Fri, 3 Nov 2023 12:45:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345834AbjKCQp2 (ORCPT ); Fri, 3 Nov 2023 12:45:28 -0400 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2088.outbound.protection.outlook.com [40.107.237.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCD04D49; Fri, 3 Nov 2023 09:45:21 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=SulgikAxGxFWdHASWjrcdFM+KDM/5YCK+WhxmGXhv07rQdnjwnIDkZNXstLlDrIl8QCm/i0srIKTVCPWMWEyxlw+LZhDRl06F5z69fToiCTMSXRqaGB8nXfQqBXwXFPWLmtrxPfDzVpdDK0ldwGyId/uL2QwaUAauAiexrlrCZechBLMsQ0QSmy1GzBH4ngoiEj4cxWoGtyzmvnJmh9mU66EQYJ9d5wg24pw1h9u+hwyC+75RZRZouVU68r019NKVYTTks+5hOlRjhZNZkUHByaIoTbVg1DJYIk5yBO0q24JIUvWL+xzkcn1ssWzVxM8V4imRoSQClg9s46muFQcMA== 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=LdsjErMszebnmFtTb6/WTM+XmGNFE0IR3PzOJuy1VLM=; b=kM9zIaX9NOMqi1N9woTN7hVDJ/Xi/DXcJlWbmSreq4eX3mbKaoOhxuBCFwlA9e7aVs4VHZ7Tkqxe1It9gslLtaNzrI5wbs/8rVPur1Jh2K7OtZTOtvgDlXM30ianttlWtreOw4syZGXefnEiwzbaggg0ZhGAUSmP+zQzVMF3SfIhKAp6l1YwOo0O4MFi3yj0LrSNbGCCvrBXcbSFge6FdIj90xqWY+eIO8DM9HBeGsua0tGE56ZkaW/xwR6wjjxs18QmG7alCzc58ZEroO/wsiCQ0lNtPZwZ6rdMkOvklDxauE1tzzXtU+Nmgsaa/shT+RWxk3uqUdRzw1BtTsG+qQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; 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=LdsjErMszebnmFtTb6/WTM+XmGNFE0IR3PzOJuy1VLM=; b=PWEkU7cBfCPLNRnK1t8TIeVVszN78B+1/T2c8D2S8TMSqYm/xDqeSvCuUImJ+GxGD/Ru08XM3LTkwtrh16+fjXNZ3uSJb+eoCeGJd6c+s6KXiCALJ8zLJhEQ8Qgoz0BzIKO7JbqI6mTcxJl28uyoJruZLT27o7Ba2aOcTsEDsS98DggVKzdDZWphA3K8eFl93iLqZHg3WBBM9w5+SX9cY2f7ZJP+YXYfk8PN7OBDclGaJOyIOVUakhEau604I32TrPUyec1ZqqXu1GkyCufkToIsoK9ofC+3cQDRW2HXNxRA6VHVhXwQLQx4XwZlJIL+Q9zyJ0jUASmQsIawWiqM5Q== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) by CH3PR12MB9282.namprd12.prod.outlook.com (2603:10b6:610:1cb::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6954.21; Fri, 3 Nov 2023 16:45:11 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::b53a:1092:9be2:cfb9]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::b53a:1092:9be2:cfb9%4]) with mapi id 15.20.6933.027; Fri, 3 Nov 2023 16:45:11 +0000 From: Jason Gunthorpe To: acpica-devel@lists.linuxfoundation.org, Alyssa Rosenzweig , Albert Ou , asahi@lists.linux.dev, Lu Baolu , Catalin Marinas , Dexuan Cui , devicetree@vger.kernel.org, David Woodhouse , Frank Rowand , Hanjun Guo , Haiyang Zhang , Christoph Hellwig , iommu@lists.linux.dev, Jean-Philippe Brucker , Jonathan Hunter , Joerg Roedel , "K. Y. Srinivasan" , Len Brown , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-snps-arc@lists.infradead.org, linux-tegra@vger.kernel.org, Russell King , Lorenzo Pieralisi , Marek Szyprowski , Hector Martin , Palmer Dabbelt , Paul Walmsley , "Rafael J. Wysocki" , Robert Moore , Rob Herring , Robin Murphy , Sudeep Holla , Suravee Suthikulpanit , Sven Peter , Thierry Reding , Thomas Bogendoerfer , Krishna Reddy , Vineet Gupta , virtualization@lists.linux-foundation.org, Wei Liu , Will Deacon Cc: Zhenhua Huang Subject: [PATCH RFC 03/17] of: Use -ENODEV consistently in of_iommu_configure() Date: Fri, 3 Nov 2023 13:44:48 -0300 Message-ID: <3-v1-5f734af130a3+34f-iommu_fwspec_jgg@nvidia.com> In-Reply-To: <0-v1-5f734af130a3+34f-iommu_fwspec_jgg@nvidia.com> References: X-ClientProxiedBy: BL1PR13CA0182.namprd13.prod.outlook.com (2603:10b6:208:2be::7) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|CH3PR12MB9282:EE_ X-MS-Office365-Filtering-Correlation-Id: bc9eba72-d890-4244-da24-08dbdc8c3bc0 X-LD-Processed: 43083d15-7273-40c1-b7db-39efd9ccc17a,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 3RYW1+fdG3jYxbYkDdXxmUXuFqfWVocaDWUAtB6tD2CEPwd4nfm0gPNvw7UVtN2sD+66LygKu6K0XfEVOhtpY1YdLCh2w/1I/48hyEw4uEXSCa49VSRKuA5nzcNXw8N/UExOiz634di7tx46JscgTT5yRQseEbaMWd6RMB+VO6F0WgCgPKcA7VnZQlHpahCPwzsbOLZmbW0bwQYE3z9/MXm5JUQ3WvrUuObdJTSbF0kd1svDTqeey+noRzojXEjaS2P9dN2hvLI7kVkaIAY7C5IVrDR5r+tLljrTBKhBKgJhXSJPQctybyPQ0MZQJ910a+s2s/WuzH2ijRnQwvIcLtFSs0YlzqX64CMEK3ySLbwjsy42lv4wjZfK/FKiNH+wegWTOjGIGm24L6uOyRjBNw2HH8nygJtPhDQ9FLrmkuocdWesQ8p0zSwE11QGWKCdA+Uu0fCJcJx/TA4PgTw594lqqpJ+K2v4iEK48JrtykAlxNx6Ea6ALMrc4B+/ykMk1ZdSLsfPEDvzyi0X1PyZeq+Te6eCbROd5GqkJHSY5z5/QRZXkYlMh+ulQ7Pr0zmZPn+leCRokv32COX/JlTS8+sSp5Q3aP5F7KVLxx0w1ec9gNufJgvAhWn8KP1xIEP3 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LV2PR12MB5869.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(396003)(346002)(366004)(39860400002)(136003)(376002)(230922051799003)(186009)(64100799003)(1800799009)(451199024)(38100700002)(2616005)(36756003)(26005)(921008)(8676002)(4326008)(316002)(86362001)(6486002)(478600001)(41300700001)(66556008)(66476007)(66946007)(110136005)(6512007)(6506007)(8936002)(5660300002)(6666004)(7406005)(2906002)(7416002)(83380400001)(4216001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: bc9eba72-d890-4244-da24-08dbdc8c3bc0 X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Nov 2023 16:45:06.1205 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: d2FfL3N3BqymAYjHr+UAS4KUeMm1aMHFjx04VGo3x8hkAzO3iIC4QOQ51TqKrv8q X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9282 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Instead of returning 1 and trying to handle positive error codes just stick to the convention of returning -ENODEV. Remove references to ops from of_iommu_configure(), a NULL ops will already generate an error code. There is no reason to check dev->bus, if err=0 at this point then the called configure functions thought there was an iommu and we should try to probe it. Remove it. Signed-off-by: Jason Gunthorpe --- drivers/iommu/of_iommu.c | 42 +++++++++++++--------------------------- 1 file changed, 13 insertions(+), 29 deletions(-) diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index e2fa29c16dd758..4f77495a2543ea 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -17,7 +17,7 @@ #include #include -#define NO_IOMMU 1 +#define NO_IOMMU -ENODEV static int of_iommu_xlate(struct device *dev, struct of_phandle_args *iommu_spec) @@ -117,9 +117,8 @@ static int of_iommu_configure_device(struct device_node *master_np, int of_iommu_configure(struct device *dev, struct device_node *master_np, const u32 *id) { - const struct iommu_ops *ops = NULL; struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); - int err = NO_IOMMU; + int err; if (!master_np) return -ENODEV; @@ -150,34 +149,19 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np, err = of_iommu_configure_device(master_np, dev, id); } - /* - * Two success conditions can be represented by non-negative err here: - * >0 : there is no IOMMU, or one was unavailable for non-fatal reasons - * 0 : we found an IOMMU, and dev->fwspec is initialised appropriately - * <0 : any actual error - */ - if (!err) { - /* The fwspec pointer changed, read it again */ - fwspec = dev_iommu_fwspec_get(dev); - ops = fwspec->ops; - } - /* - * If we have reason to believe the IOMMU driver missed the initial - * probe for dev, replay it to get things in order. - */ - if (!err && dev->bus) - err = iommu_probe_device(dev); + if (err == -ENODEV || err == -EPROBE_DEFER) + return err; + if (err) + goto err_log; - /* Ignore all other errors apart from EPROBE_DEFER */ - if (err < 0) { - if (err == -EPROBE_DEFER) - return err; - dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); - return -ENODEV; - } - if (!ops) - return -ENODEV; + err = iommu_probe_device(dev); + if (err) + goto err_log; return 0; + +err_log: + dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); + return err; } static enum iommu_resv_type __maybe_unused