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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: 6cbf43be-9ace-4ae2-0aa7-08dba3f8adbf X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Aug 2023 16:47:46.9408 (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: B5G3H+cf4iS03kStKS2jJZTcGULM9eRCYn+RDrRmyCIlCb6Yxld79E0avVgQxNVF X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB7473 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230823_094806_975550_7236240F X-CRM114-Status: GOOD ( 22.80 ) 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 Even though dma-iommu.c and CONFIG_ARM_DMA_USE_IOMMU do approximately the same stuff, the way they relate to the IOMMU core is quiet different. dma-iommu.c expects the core code to setup an UNMANAGED domain (of type IOMMU_DOMAIN_DMA) and then configures itself to use that domain. This becomes the default_domain for the group. ARM_DMA_USE_IOMMU does not use the default_domain, instead it directly allocates an UNMANAGED domain and operates it just like an external driver. In this case group->default_domain is NULL. If the driver provides a global static identity_domain then automatically use it as the default_domain when in ARM_DMA_USE_IOMMU mode. This allows drivers that implemented default_domain == NULL as an IDENTITY translation to trivially get a properly labeled non-NULL default_domain on ARM32 configs. With this arrangment when ARM_DMA_USE_IOMMU wants to disconnect from the device the normal detach_domain flow will restore the IDENTITY domain as the default domain. Overall this makes attach_dev() of the IDENTITY domain called in the same places as detach_dev(). This effectively migrates these drivers to default_domain mode. For drivers that support ARM64 they will gain support for the IDENTITY translation mode for the dma_api and behave in a uniform way. Drivers use this by setting ops->identity_domain to a static singleton iommu_domain that implements the identity attach. If the core detects ARM_DMA_USE_IOMMU mode then it automatically attaches the IDENTITY domain during probe. Drivers can continue to prevent the use of DMA translation by returning IOMMU_DOMAIN_IDENTITY from def_domain_type, this will completely prevent IOMMU_DMA from running but will not impact ARM_DMA_USE_IOMMU. This allows removing the set_platform_dma_ops() from every remaining driver. Remove the set_platform_dma_ops from rockchip and mkt_v1 as all it does is set an existing global static identity domain. mkt_v1 does not support IOMMU_DOMAIN_DMA and it does not compile on ARM64 so this transformation is safe. Tested-by: Steven Price Tested-by: Marek Szyprowski Tested-by: Nicolin Chen Reviewed-by: Lu Baolu Signed-off-by: Jason Gunthorpe Reviewed-by: Jerry Snitselaar --- drivers/iommu/iommu.c | 21 ++++++++++++++++++++- drivers/iommu/mtk_iommu_v1.c | 12 ------------ drivers/iommu/rockchip-iommu.c | 10 ---------- 3 files changed, 20 insertions(+), 23 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index bdeeb574d9495c..5fb25bcbc42f76 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1865,17 +1865,36 @@ static int iommu_get_def_domain_type(struct iommu_group *group, static int iommu_get_default_domain_type(struct iommu_group *group, int target_type) { + const struct iommu_ops *ops = group_iommu_ops(group); struct device *untrusted = NULL; struct group_device *gdev; int driver_type = 0; lockdep_assert_held(&group->mutex); + + /* + * ARM32 drivers supporting CONFIG_ARM_DMA_USE_IOMMU can declare an + * identity_domain and it will automatically become their default + * domain. Later on ARM_DMA_USE_IOMMU will install its UNMANAGED domain. + * Override the selection to IDENTITY if we are sure the driver supports + * it. + */ + if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU) && ops->identity_domain) + driver_type = IOMMU_DOMAIN_IDENTITY; + for_each_group_device(group, gdev) { driver_type = iommu_get_def_domain_type(group, gdev->dev, driver_type); - if (dev_is_pci(gdev->dev) && to_pci_dev(gdev->dev)->untrusted) + if (dev_is_pci(gdev->dev) && to_pci_dev(gdev->dev)->untrusted) { + /* + * No ARM32 using systems will set untrusted, it cannot + * work. + */ + if (WARN_ON(IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU))) + return -1; untrusted = gdev->dev; + } } if (untrusted) { diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c index cc3e7d53d33ad9..7c0c1d50df5f75 100644 --- a/drivers/iommu/mtk_iommu_v1.c +++ b/drivers/iommu/mtk_iommu_v1.c @@ -337,11 +337,6 @@ static struct iommu_domain mtk_iommu_v1_identity_domain = { .ops = &mtk_iommu_v1_identity_ops, }; -static void mtk_iommu_v1_set_platform_dma(struct device *dev) -{ - mtk_iommu_v1_identity_attach(&mtk_iommu_v1_identity_domain, dev); -} - static int mtk_iommu_v1_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t pgsize, size_t pgcount, int prot, gfp_t gfp, size_t *mapped) @@ -457,11 +452,6 @@ static int mtk_iommu_v1_create_mapping(struct device *dev, struct of_phandle_arg return 0; } -static int mtk_iommu_v1_def_domain_type(struct device *dev) -{ - return IOMMU_DOMAIN_IDENTITY; -} - static struct iommu_device *mtk_iommu_v1_probe_device(struct device *dev) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); @@ -599,10 +589,8 @@ static const struct iommu_ops mtk_iommu_v1_ops = { .probe_device = mtk_iommu_v1_probe_device, .probe_finalize = mtk_iommu_v1_probe_finalize, .release_device = mtk_iommu_v1_release_device, - .def_domain_type = mtk_iommu_v1_def_domain_type, .device_group = generic_device_group, .pgsize_bitmap = MT2701_IOMMU_PAGE_SIZE, - .set_platform_dma_ops = mtk_iommu_v1_set_platform_dma, .owner = THIS_MODULE, .default_domain_ops = &(const struct iommu_domain_ops) { .attach_dev = mtk_iommu_v1_attach_device, diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c index 033678f2f8b3ab..a582525d36f8cc 100644 --- a/drivers/iommu/rockchip-iommu.c +++ b/drivers/iommu/rockchip-iommu.c @@ -998,13 +998,6 @@ static struct iommu_domain rk_identity_domain = { .ops = &rk_identity_ops, }; -#ifdef CONFIG_ARM -static void rk_iommu_set_platform_dma(struct device *dev) -{ - WARN_ON(rk_iommu_identity_attach(&rk_identity_domain, dev)); -} -#endif - static int rk_iommu_attach_device(struct iommu_domain *domain, struct device *dev) { @@ -1183,9 +1176,6 @@ static const struct iommu_ops rk_iommu_ops = { .probe_device = rk_iommu_probe_device, .release_device = rk_iommu_release_device, .device_group = rk_iommu_device_group, -#ifdef CONFIG_ARM - .set_platform_dma_ops = rk_iommu_set_platform_dma, -#endif .pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP, .of_xlate = rk_iommu_of_xlate, .default_domain_ops = &(const struct iommu_domain_ops) {