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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 12/30] iommu/of: Add iommu_of_xlate() Date: Wed, 29 Nov 2023 21:10:19 -0400 Message-ID: <12-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: SN7P222CA0006.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:124::19) 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: 2f806ee4-4326-45e2-79e6-08dbf1412b63 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; 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: 2f806ee4-4326-45e2-79e6-08dbf1412b63 X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Nov 2023 01:10:40.7736 (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: wqSzRYknoJdjHiGX0z3ucmQf7nPG+CbmvO67yHZIMSADsmvKJUkHoPYZETTpR9Ko X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB5484 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231129_171103_457684_6DCF148B X-CRM114-Status: GOOD ( 19.24 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org This function can be called by drivers in their probe function if they want to parse their own ID table, almost always because the driver supports a multi-instance configuration and needs to extract the list of iommu_driver's and data from the ID into some internal format. The core code will find the iommu_driver for each ID table entry and validate that it matches the driver's ops. A driver provided function is called to handle the (iommu_driver, ID) tuple. Before calling this function the driver should allocate its per-driver private data and pass it through the opaque cookie priv argument. Driver's should follow a typical pattern in their probe_device: static int apple_dart_of_xlate(struct iommu_device *iommu, struct of_phandle_args *args, void *priv); [..] cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); if (!cfg) return ERR_PTR(-ENOMEM); ret = iommu_of_xlate(pinf, &apple_dart_iommu_ops, 1, &apple_dart_of_xlate, cfg); if (ret) goto err_free; dev_iommu_priv_set(dev, cfg); return &??->iommu; // The first iommu_device parsed Signed-off-by: Jason Gunthorpe --- drivers/iommu/of_iommu.c | 58 ++++++++++++++++++++++++++++++++++++ include/linux/iommu-driver.h | 13 ++++++++ 2 files changed, 71 insertions(+) diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index 37af32a6bc84e5..9c1d398aa2cd9c 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -285,6 +285,8 @@ struct parse_info { struct iommu_probe_info *pinf; const struct iommu_ops *ops; int num_cells; + iommu_of_xlate_fn xlate_fn; + void *priv; }; static struct iommu_device *parse_iommu(struct parse_info *info, @@ -336,3 +338,59 @@ struct iommu_device *__iommu_of_get_single_iommu(struct iommu_probe_info *pinf, return iommu_fw_finish_get_single(pinf); } EXPORT_SYMBOL_GPL(__iommu_of_get_single_iommu); + +static int parse_of_xlate(struct of_phandle_args *iommu_spec, void *_info) +{ + struct parse_info *info = _info; + struct iommu_device *iommu; + + iommu = parse_iommu(info, iommu_spec); + if (IS_ERR(iommu)) + return PTR_ERR(iommu); + info->pinf->num_ids++; + return info->xlate_fn(iommu, iommu_spec, info->priv); +} + +/** + * iommu_of_xlate - Parse all OF ids for an IOMMU + * @pinf: The iommu_probe_info + * @ops: The ops the iommu instance must have + * @num_cells: #iommu-cells value to enforce, -1 is no check + * @fn: Call for each Instance and ID + * @priv: Opaque cookie for fn + * + * Drivers that support multiple iommu instances must call this function to + * parse each instance from the OF table. fn will be called with the driver's + * iommu_driver instance and the raw of_phandle_args that contains the ID. + * + * Drivers that need to parse a complex ID format should also use this function. + */ +int iommu_of_xlate(struct iommu_probe_info *pinf, const struct iommu_ops *ops, + int num_cells, iommu_of_xlate_fn fn, void *priv) +{ + struct parse_info info = { .pinf = pinf, + .ops = ops, + .num_cells = num_cells, + .xlate_fn = fn, + .priv = priv }; + + pinf->num_ids = 0; + return of_iommu_for_each_id(pinf->dev, pinf->of_master_np, + pinf->of_map_id, parse_of_xlate, &info); +} +EXPORT_SYMBOL_GPL(iommu_of_xlate); + +/* + * Temporary approach to allow drivers to opt into the bus probe. It configures + * the iommu_probe_info to probe the dev->of_node. This is a bit hacky because + * it mutates the iommu_probe_info and thus assumes there is only one op in the + * system. Remove when we call probe from the bus always anyhow. + */ +void iommu_of_allow_bus_probe(struct iommu_probe_info *pinf) +{ + if (pinf->is_dma_configure) + return; + pinf->of_master_np = pinf->dev->of_node; + pinf->is_dma_configure = true; +} +EXPORT_SYMBOL_GPL(iommu_of_allow_bus_probe); diff --git a/include/linux/iommu-driver.h b/include/linux/iommu-driver.h index 597998a62b0dd6..622d6ad9056ce0 100644 --- a/include/linux/iommu-driver.h +++ b/include/linux/iommu-driver.h @@ -60,9 +60,16 @@ iommu_device_from_fwnode_pinf(struct iommu_probe_info *pinf, struct fwnode_handle *fwnode); struct iommu_device *iommu_fw_finish_get_single(struct iommu_probe_info *pinf); +typedef int (*iommu_of_xlate_fn)(struct iommu_device *iommu, + struct of_phandle_args *args, void *priv); +void iommu_of_allow_bus_probe(struct iommu_probe_info *pinf); + #if IS_ENABLED(CONFIG_OF_IOMMU) void of_iommu_get_resv_regions(struct device *dev, struct list_head *list); +int iommu_of_xlate(struct iommu_probe_info *pinf, const struct iommu_ops *ops, + int num_cells, iommu_of_xlate_fn fn, void *priv); + struct iommu_device *__iommu_of_get_single_iommu(struct iommu_probe_info *pinf, const struct iommu_ops *ops, int num_cells); @@ -71,6 +78,12 @@ static inline void of_iommu_get_resv_regions(struct device *dev, struct list_head *list) { } +static inline int iommu_of_xlate(struct iommu_probe_info *pinf, + const struct iommu_ops *ops, int num_cells, + iommu_of_xlate_fn fn, void *priv) +{ + return -ENODEV; +} static inline struct iommu_device *__iommu_of_get_single_iommu(struct iommu_probe_info *pinf, const struct iommu_ops *ops,