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R. Silva" , Heiko Stuebner , iommu@lists.linux.dev, Jean-Philippe Brucker , Jernej Skrabec , Jonathan Hunter , Joerg Roedel , Kees Cook , Konrad Dybcio , Krzysztof Kozlowski , Len Brown , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, Lorenzo Pieralisi , Marek Szyprowski , Hector Martin , Matthias Brugger , Orson Zhai , "Rafael J. Wysocki" , Rob Clark , Robert Moore , Rob Herring , Robin Murphy , Samuel Holland , Sudeep Holla , Sven Peter , Thierry Reding , Krishna Reddy , virtualization@lists.linux.dev, Chen-Yu Tsai , Will Deacon , Yong Wu , Chunyan Zhang Cc: =?utf-8?q?Andr=C3=A9_Draszik?= , patches@lists.linux.dev Subject: [PATCH 13/30] iommu/dart: Move to iommu_of_xlate() Date: Wed, 29 Nov 2023 21:10:20 -0400 Message-ID: <13-v1-f82a05539a64+5042-iommu_fwspec_p2_jgg@nvidia.com> In-Reply-To: <0-v1-f82a05539a64+5042-iommu_fwspec_p2_jgg@nvidia.com> References: X-ClientProxiedBy: SA1P222CA0145.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:3c2::29) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|PH0PR12MB5484:EE_ X-MS-Office365-Filtering-Correlation-Id: 675f93e3-a2ba-4189-b362-08dbf1412c35 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:LV2PR12MB5869.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(366004)(346002)(136003)(396003)(39860400002)(376002)(230922051799003)(451199024)(1800799012)(186009)(64100799003)(1191002)(8936002)(110136005)(8676002)(316002)(66556008)(4326008)(86362001)(66476007)(6486002)(478600001)(66946007)(41300700001)(36756003)(921008)(7416002)(7366002)(2906002)(7406005)(5660300002)(38100700002)(2616005)(6512007)(6506007)(6666004)(83380400001)(26005)(202311291699003);DIR:OUT;SFP:1101; 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It loads the FW data into a pre-allocated 2d array inside it's per-device data. Switch over by allocating the per-device data at the top of probe then calling iommu_of_xlate() to fill in the 2d array. The iommu instance is located by the core code and container_of() gets to the dart version. Solve a few issues: - A bus probe was failing by accident because the of_xlate not being called left a NULL cfg in the priv, and other code tended to free the dev->iommu. iommu_of_xlate() will fail bus probe directly - Missing validation that the node in the iommus instance is actually pointing at this driver - Don't leak the cfg. It is allocated during probe, freed on probe failure, and freed in release_device() on probe success. Previously it would allocate it in of_xlate and leak it in some possible error flows. Signed-off-by: Jason Gunthorpe --- drivers/iommu/apple-dart.c | 58 +++++++++++++++++++++----------------- 1 file changed, 32 insertions(+), 26 deletions(-) diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index bb0e5a4577fc03..b796c68ae45ad8 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -268,10 +268,10 @@ struct apple_dart_domain { }; /* - * This structure is attached to devices with dev_iommu_priv_set() on of_xlate - * and contains a list of streams bound to this device. - * So far the worst case seen is a single device with two streams - * from different darts, such that this simple static array is enough. + * This structure is attached to devices with dev_iommu_priv_set() on + * probe_device and contains a list of streams bound to this device. So far the + * worst case seen is a single device with two streams from different darts, + * such that this simple static array is enough. * * @streams: streams for this device */ @@ -295,6 +295,9 @@ struct apple_dart_master_cfg { static struct platform_driver apple_dart_driver; static const struct iommu_ops apple_dart_iommu_ops; +static int apple_dart_of_xlate(struct iommu_device *iommu, + struct of_phandle_args *args, void *priv); + static struct apple_dart_domain *to_dart_domain(struct iommu_domain *dom) { return container_of(dom, struct apple_dart_domain, domain); @@ -721,21 +724,34 @@ static struct iommu_domain apple_dart_blocked_domain = { .ops = &apple_dart_blocked_ops, }; -static struct iommu_device *apple_dart_probe_device(struct device *dev) +static struct iommu_device * +apple_dart_probe_device(struct iommu_probe_info *pinf) { - struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev); + struct device *dev = pinf->dev; + struct apple_dart_master_cfg *cfg; struct apple_dart_stream_map *stream_map; + int ret; int i; + cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); if (!cfg) - return ERR_PTR(-ENODEV); + return ERR_PTR(-ENOMEM); + ret = iommu_of_xlate(pinf, &apple_dart_iommu_ops, 1, + &apple_dart_of_xlate, cfg); + if (ret) + goto err_free; for_each_stream_map(i, cfg, stream_map) device_link_add( dev, stream_map->dart->dev, DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER); + dev_iommu_priv_set(dev, cfg); return &cfg->stream_maps[0].dart->iommu; + +err_free: + kfree(cfg); + return ERR_PTR(ret); } static void apple_dart_release_device(struct device *dev) @@ -778,25 +794,15 @@ static void apple_dart_domain_free(struct iommu_domain *domain) kfree(dart_domain); } -static int apple_dart_of_xlate(struct device *dev, struct of_phandle_args *args) +static int apple_dart_of_xlate(struct iommu_device *iommu, + struct of_phandle_args *args, void *priv) { - struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev); - struct platform_device *iommu_pdev = of_find_device_by_node(args->np); - struct apple_dart *dart = platform_get_drvdata(iommu_pdev); - struct apple_dart *cfg_dart; - int i, sid; + struct apple_dart *dart = container_of(iommu, struct apple_dart, iommu); + struct apple_dart_master_cfg *cfg = priv; + struct apple_dart *cfg_dart = cfg->stream_maps[0].dart; + int sid = args->args[0]; + int i; - if (args->args_count != 1) - return -EINVAL; - sid = args->args[0]; - - if (!cfg) - cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); - if (!cfg) - return -ENOMEM; - dev_iommu_priv_set(dev, cfg); - - cfg_dart = cfg->stream_maps[0].dart; if (cfg_dart) { if (cfg_dart->supports_bypass != dart->supports_bypass) return -EINVAL; @@ -978,10 +984,10 @@ static const struct iommu_ops apple_dart_iommu_ops = { .identity_domain = &apple_dart_identity_domain, .blocked_domain = &apple_dart_blocked_domain, .domain_alloc_paging = apple_dart_domain_alloc_paging, - .probe_device = apple_dart_probe_device, + .probe_device_pinf = apple_dart_probe_device, .release_device = apple_dart_release_device, .device_group = apple_dart_device_group, - .of_xlate = apple_dart_of_xlate, + .of_xlate = iommu_dummy_of_xlate, .def_domain_type = apple_dart_def_domain_type, .get_resv_regions = apple_dart_get_resv_regions, .pgsize_bitmap = -1UL, /* Restricted during dart probe */