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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jan 2023 20:05:07.7639 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f42cbbc0-a718-4abb-ac8f-08db00a1c9df X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT059.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7531 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Both IOMMU_DOMAIN_UNMANAGED and IOMMU_DOMAIN_DMA require the support of __IOMMU_DOMAIN_PAGING capability, i.e. iommu_map/unmap. However, some older iommu drivers do not fully support that, and these drivers also do not advertise support for dma-iommu.c via IOMMU_DOMAIN_DMA, or use arm_iommu_create_mapping(), so largely their implementations of IOMMU_DOMAIN_UNMANAGED are untested. This means that a user like vfio/iommufd does not likely work with them. Several of them have obvious problems: * fsl_pamu_domain.c Without map/unmap ops in the default_domain_ops, it isn't an unmanaged domain at all. * mtk_iommu_v1.c With a fixed 4M "pagetable", it can only map exactly 4G of memory, but doesn't set the aperture. * tegra-gart.c Its notion of attach/detach and groups has to be a complete lie to get around all the other API expectations. Some others might work but have never been tested with vfio/iommufd: * msm_iommu.c * omap-iommu.c * tegra-smmu.c Thus, mark all these drivers as having "broken" UNAMANGED domains and add a new device_iommu_unmanaged_supported() API for vfio/iommufd and dma-iommu to refuse to work with these drivers. Co-developed-by: Jason Gunthorpe Signed-off-by: Jason Gunthorpe Signed-off-by: Nicolin Chen Signed-off-by: Jason Gunthorpe --- drivers/iommu/fsl_pamu_domain.c | 1 + drivers/iommu/iommu.c | 24 ++++++++++++++++++++++++ drivers/iommu/msm_iommu.c | 1 + drivers/iommu/mtk_iommu_v1.c | 1 + drivers/iommu/omap-iommu.c | 1 + drivers/iommu/tegra-gart.c | 1 + drivers/iommu/tegra-smmu.c | 1 + include/linux/iommu.h | 11 +++++++++++ 8 files changed, 41 insertions(+) diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c index 4408ac3c49b6..1f3a4c8c78ad 100644 --- a/drivers/iommu/fsl_pamu_domain.c +++ b/drivers/iommu/fsl_pamu_domain.c @@ -448,6 +448,7 @@ static struct iommu_device *fsl_pamu_probe_device(struct device *dev) } static const struct iommu_ops fsl_pamu_ops = { + .broken_unmanaged_domain = true, .capable = fsl_pamu_capable, .domain_alloc = fsl_pamu_domain_alloc, .probe_device = fsl_pamu_probe_device, diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 5f6a85aea501..648fc04143b8 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1897,6 +1897,30 @@ bool device_iommu_capable(struct device *dev, enum iommu_cap cap) } EXPORT_SYMBOL_GPL(device_iommu_capable); +/** + * device_iommu_unmanaged_supported() - full support of IOMMU_DOMAIN_UNMANAGED + * @dev: device that is behind the iommu + * + * In general, all IOMMU drivers can allocate IOMMU_DOMAIN_UNMANAGED domains. + * However, some of them set the broken_unmanaged_domain, indicating something + * is wrong about its support of IOMMU_DOMAIN_UNMANAGED/__IOMMU_DOMAIN_PAGING. + * This can happen, when a driver lies about the support to get around with the + * IOMMU API, merely for other drivers to use, or when a driver has never been + * tested with vfio/iommufd that need a full support of IOMMU_DOMAIN_UNMANAGED. + * + * Return: true if an IOMMU is present and broken_unmanaged_domain is not set, + * otherwise, false. + */ +bool device_iommu_unmanaged_supported(struct device *dev) +{ + if (dev->iommu && dev->iommu->iommu_dev && + !dev_iommu_ops(dev)->broken_unmanaged_domain) + return true; + + return false; +} +EXPORT_SYMBOL_GPL(device_iommu_unmanaged_supported); + /** * iommu_set_fault_handler() - set a fault handler for an iommu domain * @domain: iommu domain diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c index c60624910872..9c0bd5aee10b 100644 --- a/drivers/iommu/msm_iommu.c +++ b/drivers/iommu/msm_iommu.c @@ -675,6 +675,7 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id) } static struct iommu_ops msm_iommu_ops = { + .broken_unmanaged_domain = true, .domain_alloc = msm_iommu_domain_alloc, .probe_device = msm_iommu_probe_device, .device_group = generic_device_group, diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c index ca581ff1c769..c2ecbff6592c 100644 --- a/drivers/iommu/mtk_iommu_v1.c +++ b/drivers/iommu/mtk_iommu_v1.c @@ -578,6 +578,7 @@ static int mtk_iommu_v1_hw_init(const struct mtk_iommu_v1_data *data) } static const struct iommu_ops mtk_iommu_v1_ops = { + .broken_unmanaged_domain = true, .domain_alloc = mtk_iommu_v1_domain_alloc, .probe_device = mtk_iommu_v1_probe_device, .probe_finalize = mtk_iommu_v1_probe_finalize, diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index 2fd7702c6709..17ed392b9f63 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -1733,6 +1733,7 @@ static struct iommu_group *omap_iommu_device_group(struct device *dev) } static const struct iommu_ops omap_iommu_ops = { + .broken_unmanaged_domain = true, .domain_alloc = omap_iommu_domain_alloc, .probe_device = omap_iommu_probe_device, .release_device = omap_iommu_release_device, diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c index ed53279d1106..9af56d2ec6c1 100644 --- a/drivers/iommu/tegra-gart.c +++ b/drivers/iommu/tegra-gart.c @@ -267,6 +267,7 @@ static void gart_iommu_sync(struct iommu_domain *domain, } static const struct iommu_ops gart_iommu_ops = { + .broken_unmanaged_domain = true, .domain_alloc = gart_iommu_domain_alloc, .probe_device = gart_iommu_probe_device, .device_group = generic_device_group, diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 5b1af40221ec..d1e4c4825d74 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -962,6 +962,7 @@ static int tegra_smmu_of_xlate(struct device *dev, } static const struct iommu_ops tegra_smmu_ops = { + .broken_unmanaged_domain = true, .domain_alloc = tegra_smmu_domain_alloc, .probe_device = tegra_smmu_probe_device, .device_group = tegra_smmu_device_group, diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 46e1347bfa22..919a5dbad75b 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -245,6 +245,10 @@ struct iommu_iotlb_gather { * pasid, so that any DMA transactions with this pasid * will be blocked by the hardware. * @pgsize_bitmap: bitmap of all possible supported page sizes + * @broken_unmanaged_domain: IOMMU_DOMAIN_UNMANAGED is not fully functional; the + * driver does not really support iommu_map/unmap, but + * uses UNMANAGED domains for the IOMMU API, called by + * other SOC drivers. * @owner: Driver module providing these ops */ struct iommu_ops { @@ -277,6 +281,7 @@ struct iommu_ops { const struct iommu_domain_ops *default_domain_ops; unsigned long pgsize_bitmap; + bool broken_unmanaged_domain; struct module *owner; }; @@ -455,6 +460,7 @@ static inline const struct iommu_ops *dev_iommu_ops(struct device *dev) extern int bus_iommu_probe(struct bus_type *bus); extern bool iommu_present(struct bus_type *bus); extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap); +extern bool device_iommu_unmanaged_supported(struct device *dev); extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus); extern struct iommu_group *iommu_group_get_by_id(int id); extern void iommu_domain_free(struct iommu_domain *domain); @@ -742,6 +748,11 @@ static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap) return false; } +static inline bool device_iommu_unmanaged_supported(struct device *dev) +{ + return false; +} + static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) { return NULL; From patchwork Fri Jan 27 20:04:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 13119342 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 68369C636CB for ; Fri, 27 Jan 2023 20:06:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233509AbjA0UGa (ORCPT ); Fri, 27 Jan 2023 15:06:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232340AbjA0UGJ (ORCPT ); Fri, 27 Jan 2023 15:06:09 -0500 Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2073.outbound.protection.outlook.com [40.107.244.73]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34A3D1968D; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jan 2023 20:05:08.6271 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e581f0a5-0c46-48b6-6296-08db00a1ca63 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT112.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4417 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add a sanity of the broken_unmanaged_domain flag to reject the use of dma-iommu in the early stage, if the flag is set by the iommu driver. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/dma-iommu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index f798c44e0903..f1e8d952b17d 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -545,6 +545,9 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, if (!cookie || cookie->type != IOMMU_DMA_IOVA_COOKIE) return -EINVAL; + if (WARN_ON(!device_iommu_unmanaged_supported(dev))) + return -EINVAL; + iovad = &cookie->iovad; /* Use the smallest supported page size for IOVA granularity */ From patchwork Fri Jan 27 20:04:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 13119345 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 0D487C54EAA for ; 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Fri, 27 Jan 2023 12:04:58 -0800 From: Nicolin Chen To: , , , , , , , , , , , , CC: , , , , , , , , Subject: [PATCH 3/4] iommufd: Do not allocate device object if broken_unmanaged_domain Date: Fri, 27 Jan 2023 12:04:19 -0800 Message-ID: <74f7033192488c472ca04b7d03e4dc5705f80cc0.1674849118.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT112:EE_|PH0PR12MB5645:EE_ X-MS-Office365-Filtering-Correlation-Id: b5919e60-d0da-458f-8b87-08db00a1cb75 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:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230025)(4636009)(136003)(376002)(396003)(39860400002)(346002)(451199018)(46966006)(40470700004)(36840700001)(47076005)(82310400005)(8676002)(36756003)(40460700003)(40480700001)(336012)(7696005)(316002)(356005)(36860700001)(921005)(7636003)(426003)(2616005)(26005)(186003)(86362001)(5660300002)(4744005)(7416002)(110136005)(478600001)(6666004)(54906003)(70586007)(41300700001)(82740400003)(8936002)(2906002)(4326008)(70206006);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jan 2023 20:05:10.4238 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b5919e60-d0da-458f-8b87-08db00a1cb75 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT112.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB5645 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add a sanity of the broken_unmanaged_domain flag to reject the use of iommufd in the early stage, if the flag is set by the iommu driver. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/device.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index d81f93a321af..41b55615a693 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -73,6 +73,9 @@ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY)) return ERR_PTR(-EINVAL); + if (!device_iommu_unmanaged_supported(dev)) + return ERR_PTR(-EINVAL); + group = iommu_group_get(dev); if (!group) return ERR_PTR(-ENODEV); From patchwork Fri Jan 27 20:04:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 13119344 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 8EF51C54EAA for ; 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Fri, 27 Jan 2023 12:05:00 -0800 From: Nicolin Chen To: , , , , , , , , , , , , CC: , , , , , , , , Subject: [PATCH 4/4] vfio: Do not allocate domain if broken_unmanaged_domain Date: Fri, 27 Jan 2023 12:04:20 -0800 Message-ID: <42f5cec9d3f03eab3af9509bd5a730f6a1414989.1674849118.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT039:EE_|DS0PR12MB8365:EE_ X-MS-Office365-Filtering-Correlation-Id: 16aa347e-5ccd-4e8c-007b-08db00a1cc0b 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:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230025)(4636009)(396003)(376002)(39860400002)(136003)(346002)(451199018)(36840700001)(46966006)(40470700004)(8936002)(2616005)(5660300002)(41300700001)(70206006)(2906002)(70586007)(4326008)(8676002)(7696005)(336012)(186003)(6666004)(26005)(83380400001)(426003)(86362001)(82310400005)(47076005)(82740400003)(316002)(7636003)(4744005)(7416002)(478600001)(54906003)(110136005)(36756003)(356005)(40460700003)(40480700001)(921005)(36860700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jan 2023 20:05:11.4190 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 16aa347e-5ccd-4e8c-007b-08db00a1cc0b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT039.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8365 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add a sanity of the broken_unmanaged_domain flag to reject the use of vfio_iommu_type1 in the early stage, if the flag is set by the iommu driver. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/vfio/vfio_iommu_type1.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 23c24fe98c00..6ec238aefe89 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -2170,7 +2170,10 @@ static int vfio_iommu_domain_alloc(struct device *dev, void *data) { struct iommu_domain **domain = data; - *domain = iommu_domain_alloc(dev->bus); + if (device_iommu_unmanaged_supported(dev)) + *domain = iommu_domain_alloc(dev->bus); + else + *domain = NULL; return 1; /* Don't iterate */ }