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GET /api/patches/1869533/?format=api
{ "id": 1869533, "url": "http://patchwork.ozlabs.org/api/patches/1869533/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-arc/patch/6-v1-720585788a7d+811b-iommu_fwspec_p1_jgg@nvidia.com/", "project": { "id": 48, "url": "http://patchwork.ozlabs.org/api/projects/48/?format=api", "name": "Linux ARC development", "link_name": "linux-arc", "list_id": "linux-snps-arc.lists.infradead.org", "list_email": "linux-snps-arc@lists.infradead.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<6-v1-720585788a7d+811b-iommu_fwspec_p1_jgg@nvidia.com>", "list_archive_url": null, "date": "2023-11-29T00:48:02", "name": "[06/10] iommu: Replace iommu_device_lock with iommu_probe_device_lock", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ebeb753d49a519fa2a953b75bee4e80c5029419d", "submitter": { "id": 79424, "url": "http://patchwork.ozlabs.org/api/people/79424/?format=api", "name": "Jason Gunthorpe", "email": "jgg@nvidia.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-arc/patch/6-v1-720585788a7d+811b-iommu_fwspec_p1_jgg@nvidia.com/mbox/", "series": [ { "id": 384302, "url": "http://patchwork.ozlabs.org/api/series/384302/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-arc/list/?series=384302", "date": "2023-11-29T00:47:56", "name": "IOMMU related FW parsing cleanup", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/384302/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/1869533/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/1869533/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=X2emngZY;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256\n header.s=selector2 header.b=N/iXvLmF;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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Y. Srinivasan\" <kys@microsoft.com>,\n\tLaxman Dewangan <ldewangan@nvidia.com>,\n\tLen Brown <lenb@kernel.org>,\n\tlinux-acpi@vger.kernel.org,\n\tlinux-arm-kernel@lists.infradead.org,\n\tlinux-hyperv@vger.kernel.org,\n\tlinux-mips@vger.kernel.org,\n\tlinux-riscv@lists.infradead.org,\n\tlinux-snps-arc@lists.infradead.org,\n\tlinux-tegra@vger.kernel.org,\n\tRussell King <linux@armlinux.org.uk>,\n\tLorenzo Pieralisi <lpieralisi@kernel.org>,\n\tLyude Paul <lyude@redhat.com>,\n\tMarek Szyprowski <m.szyprowski@samsung.com>,\n\tnouveau@lists.freedesktop.org,\n\tPalmer Dabbelt <palmer@dabbelt.com>,\n\tPaul Walmsley <paul.walmsley@sifive.com>,\n\t\"Rafael J. Wysocki\" <rafael@kernel.org>,\n\tRob Herring <robh+dt@kernel.org>,\n\tRobin Murphy <robin.murphy@arm.com>,\n\tSudeep Holla <sudeep.holla@arm.com>,\n\tSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>,\n\tSven Peter <sven@svenpeter.dev>,\n\tThomas Bogendoerfer <tsbogend@alpha.franken.de>,\n\tVineet Gupta <vgupta@kernel.org>,\n\tVinod Koul <vkoul@kernel.org>,\n\tWei Liu <wei.liu@kernel.org>,\n\tWill Deacon <will@kernel.org>", "Cc": "Lu Baolu <baolu.lu@linux.intel.com>,\n\tChristoph Hellwig <hch@lst.de>,\n\tJerry Snitselaar <jsnitsel@redhat.com>,\n\tHector Martin <marcan@marcan.st>,\n\tMoritz Fischer <mdf@kernel.org>,\n\tpatches@lists.linux.dev,\n\t\"Rafael J. Wysocki\" <rafael.j.wysocki@intel.com>,\n\tRob Herring <robh@kernel.org>,\n\tThierry Reding <thierry.reding@gmail.com>", "Subject": "[PATCH 06/10] iommu: Replace iommu_device_lock with\n iommu_probe_device_lock", "Date": "Tue, 28 Nov 2023 20:48:02 -0400", "Message-ID": "<6-v1-720585788a7d+811b-iommu_fwspec_p1_jgg@nvidia.com>", "In-Reply-To": "<0-v1-720585788a7d+811b-iommu_fwspec_p1_jgg@nvidia.com>", "References": "", "X-ClientProxiedBy": "SA1P222CA0194.NAMP222.PROD.OUTLOOK.COM\n (2603:10b6:806:3c4::19) To LV2PR12MB5869.namprd12.prod.outlook.com\n (2603:10b6:408:176::16)", "MIME-Version": "1.0", "X-MS-PublicTrafficType": "Email", "X-MS-TrafficTypeDiagnostic": "LV2PR12MB5869:EE_|MW5PR12MB5649:EE_", "X-MS-Office365-Filtering-Correlation-Id": "8536a7a9-4d35-47de-3bfe-08dbf074db6a", "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": "\n 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", "X-Forefront-Antispam-Report": "\n 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)(136003)(39860400002)(396003)(366004)(376002)(346002)(230922051799003)(186009)(1800799012)(64100799003)(451199024)(5660300002)(7416002)(7366002)(7406005)(41300700001)(4326008)(8936002)(8676002)(2906002)(110136005)(316002)(66556008)(66476007)(54906003)(66946007)(2616005)(921008)(6486002)(478600001)(36756003)(6512007)(6506007)(26005)(6666004)(83380400001)(86362001)(38100700002)(4216001);DIR:OUT;SFP:1101;", "X-MS-Exchange-AntiSpam-MessageData-ChunkCount": "1", "X-MS-Exchange-AntiSpam-MessageData-0": "\n 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", "X-OriginatorOrg": "Nvidia.com", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 8536a7a9-4d35-47de-3bfe-08dbf074db6a", "X-MS-Exchange-CrossTenant-AuthSource": "LV2PR12MB5869.namprd12.prod.outlook.com", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "29 Nov 2023 00:48:09.2376\n (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": "\n vU8nM8hRTqWQk/nZDor+27mpHqRBzU3fNn/Vj2pJuFDohMSLaOPZEvzrbRjxh0aO", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "MW5PR12MB5649", "X-CRM114-Version": "20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ", "X-CRM114-CacheID": "sfid-20231128_164822_688763_297C382F ", "X-CRM114-Status": "GOOD ( 16.01 )", "X-Spam-Score": "0.6 (/)", "X-Spam-Report": "Spam detection software,\n running on the system \"bombadil.infradead.org\",\n has NOT identified this incoming email as spam. The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: The iommu_device_lock protects the iommu_device_list which\n is only read by iommu_ops_from_fwnode(). This is now always called under\n the iommu_probe_device_lock,\n so we don't need to double lock the linked list.\n Use the iommu_probe_device_lock on the write side too.\n Content analysis details: (0.6 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n 0.0 SPF_NONE SPF: sender does not publish an SPF Record\n -0.0 SPF_HELO_PASS SPF: HELO matches SPF record\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily\n valid\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n 1.0 FORGED_SPF_HELO No description available.\n -0.2 DKIMWL_WL_HIGH DKIMwl.org - High trust sender", "X-BeenThere": "linux-snps-arc@lists.infradead.org", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "Linux on Synopsys ARC Processors <linux-snps-arc.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/linux-snps-arc>,\n <mailto:linux-snps-arc-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/linux-snps-arc/>", "List-Post": "<mailto:linux-snps-arc@lists.infradead.org>", "List-Help": "<mailto:linux-snps-arc-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/linux-snps-arc>,\n <mailto:linux-snps-arc-request@lists.infradead.org?subject=subscribe>", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Sender": "\"linux-snps-arc\" <linux-snps-arc-bounces@lists.infradead.org>", "Errors-To": "\n linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "The iommu_device_lock protects the iommu_device_list which is only read by\niommu_ops_from_fwnode().\n\nThis is now always called under the iommu_probe_device_lock, so we don't\nneed to double lock the linked list. Use the iommu_probe_device_lock on\nthe write side too.\n\nSigned-off-by: Jason Gunthorpe <jgg@nvidia.com>\n---\n drivers/iommu/iommu.c | 30 +++++++++++++-----------------\n 1 file changed, 13 insertions(+), 17 deletions(-)", "diff": "diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c\nindex 08f29a1dfcd5f8..9557c2ec08d915 100644\n--- a/drivers/iommu/iommu.c\n+++ b/drivers/iommu/iommu.c\n@@ -146,7 +146,6 @@ struct iommu_group_attribute iommu_group_attr_##_name =\t\t\\\n \tcontainer_of(_kobj, struct iommu_group, kobj)\n \n static LIST_HEAD(iommu_device_list);\n-static DEFINE_SPINLOCK(iommu_device_lock);\n \n static const struct bus_type * const iommu_buses[] = {\n \t&platform_bus_type,\n@@ -262,9 +261,9 @@ int iommu_device_register(struct iommu_device *iommu,\n \tif (hwdev)\n \t\tiommu->fwnode = dev_fwnode(hwdev);\n \n-\tspin_lock(&iommu_device_lock);\n+\tmutex_lock(&iommu_probe_device_lock);\n \tlist_add_tail(&iommu->list, &iommu_device_list);\n-\tspin_unlock(&iommu_device_lock);\n+\tmutex_unlock(&iommu_probe_device_lock);\n \n \tfor (int i = 0; i < ARRAY_SIZE(iommu_buses) && !err; i++)\n \t\terr = bus_iommu_probe(iommu_buses[i]);\n@@ -279,9 +278,9 @@ void iommu_device_unregister(struct iommu_device *iommu)\n \tfor (int i = 0; i < ARRAY_SIZE(iommu_buses); i++)\n \t\tbus_for_each_dev(iommu_buses[i], NULL, iommu, remove_iommu_group);\n \n-\tspin_lock(&iommu_device_lock);\n+\tmutex_lock(&iommu_probe_device_lock);\n \tlist_del(&iommu->list);\n-\tspin_unlock(&iommu_device_lock);\n+\tmutex_unlock(&iommu_probe_device_lock);\n \n \t/* Pairs with the alloc in generic_single_device_group() */\n \tiommu_group_put(iommu->singleton_group);\n@@ -316,9 +315,9 @@ int iommu_device_register_bus(struct iommu_device *iommu,\n \tif (err)\n \t\treturn err;\n \n-\tspin_lock(&iommu_device_lock);\n+\tmutex_lock(&iommu_probe_device_lock);\n \tlist_add_tail(&iommu->list, &iommu_device_list);\n-\tspin_unlock(&iommu_device_lock);\n+\tmutex_unlock(&iommu_probe_device_lock);\n \n \terr = bus_iommu_probe(bus);\n \tif (err) {\n@@ -2033,9 +2032,9 @@ bool iommu_present(const struct bus_type *bus)\n \n \tfor (int i = 0; i < ARRAY_SIZE(iommu_buses); i++) {\n \t\tif (iommu_buses[i] == bus) {\n-\t\t\tspin_lock(&iommu_device_lock);\n+\t\t\tmutex_lock(&iommu_probe_device_lock);\n \t\t\tret = !list_empty(&iommu_device_list);\n-\t\t\tspin_unlock(&iommu_device_lock);\n+\t\t\tmutex_unlock(&iommu_probe_device_lock);\n \t\t}\n \t}\n \treturn ret;\n@@ -2980,17 +2979,14 @@ EXPORT_SYMBOL_GPL(iommu_default_passthrough);\n \n const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)\n {\n-\tconst struct iommu_ops *ops = NULL;\n \tstruct iommu_device *iommu;\n \n-\tspin_lock(&iommu_device_lock);\n+\tlockdep_assert_held(&iommu_probe_device_lock);\n+\n \tlist_for_each_entry(iommu, &iommu_device_list, list)\n-\t\tif (iommu->fwnode == fwnode) {\n-\t\t\tops = iommu->ops;\n-\t\t\tbreak;\n-\t\t}\n-\tspin_unlock(&iommu_device_lock);\n-\treturn ops;\n+\t\tif (iommu->fwnode == fwnode)\n+\t\t\treturn iommu->ops;\n+\treturn NULL;\n }\n \n int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,\n", "prefixes": [ "06/10" ] }