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Tue, 16 May 2023 00:01:03 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::f7a7:a561:87e9:5fab]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::f7a7:a561:87e9:5fab%6]) with mapi id 15.20.6387.030; Tue, 16 May 2023 00:01:03 +0000 From: Jason Gunthorpe To: Andy Gross , Alim Akhtar , Bjorn Andersson , AngeloGioacchino Del Regno , Baolin Wang , Christophe Leroy , Gerald Schaefer , Heiko Stuebner , iommu@lists.linux.dev, Jernej Skrabec , Jonathan Hunter , Joerg Roedel , Kevin Tian , Konrad Dybcio , Krzysztof Kozlowski , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, Russell King , linuxppc-dev@lists.ozlabs.org, Marek Szyprowski , Matthias Brugger , Matthew Rosato , Michael Ellerman , Nicholas Piggin , Orson Zhai , Rob Clark , Robin Murphy , Samuel Holland , Thierry Reding , Krishna Reddy , Chen-Yu Tsai , Will Deacon , Yong Wu , Chunyan Zhang Cc: Lu Baolu , Dmitry Osipenko , Nicolin Chen , Niklas Schnelle , Steven Price , Thierry Reding Subject: [PATCH v2 02/25] iommu: Add IOMMU_DOMAIN_PLATFORM Date: Mon, 15 May 2023 21:00:35 -0300 Message-Id: <2-v2-8d1dc464eac9+10f-iommu_all_defdom_jgg@nvidia.com> In-Reply-To: <0-v2-8d1dc464eac9+10f-iommu_all_defdom_jgg@nvidia.com> References: X-ClientProxiedBy: MN2PR08CA0021.namprd08.prod.outlook.com (2603:10b6:208:239::26) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|PH7PR12MB6786:EE_ X-MS-Office365-Filtering-Correlation-Id: f7e6dcf6-eda8-4559-f632-08db55a0a23d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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It is designed to preserve the original ops->detach_dev() semantic that these S390 was built around. Provide an opaque domain type and a 'default_domain' ops value that allows the driver to trivially force any single domain as the default domain. Signed-off-by: Jason Gunthorpe --- drivers/iommu/iommu.c | 14 +++++++++++++- include/linux/iommu.h | 6 ++++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index e02bc94a6c80cc..3a72859747bae0 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1644,6 +1644,17 @@ iommu_group_alloc_default_domain(struct iommu_group *group, int req_type) lockdep_assert_held(&group->mutex); + /* + * Allow legacy drivers to specify the domain that will be the default + * domain. This should always be either an IDENTITY or PLATFORM domain. + * Do not use in new drivers. + */ + if (bus->iommu_ops->default_domain) { + if (req_type) + return ERR_PTR(-EINVAL); + return bus->iommu_ops->default_domain; + } + if (req_type) return __iommu_group_alloc_default_domain(bus, group, req_type); @@ -1952,7 +1963,8 @@ void iommu_domain_free(struct iommu_domain *domain) if (domain->type == IOMMU_DOMAIN_SVA) mmdrop(domain->mm); iommu_put_dma_cookie(domain); - domain->ops->free(domain); + if (domain->ops->free) + domain->ops->free(domain); } EXPORT_SYMBOL_GPL(iommu_domain_free); diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 2823b0b23e6cb5..ddd284f8e5b768 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -64,6 +64,7 @@ struct iommu_domain_geometry { #define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */ #define __IOMMU_DOMAIN_SVA (1U << 4) /* Shared process address space */ +#define __IOMMU_DOMAIN_PLATFORM (1U << 5) /* * This are the possible domain-types @@ -80,6 +81,8 @@ struct iommu_domain_geometry { * invalidation. * IOMMU_DOMAIN_SVA - DMA addresses are shared process addresses * represented by mm_struct's. + * IOMMU_DOMAIN_PLATFORM - Legacy domain for drivers that do their own + * dma_api stuff. Do not use in new drivers. */ #define IOMMU_DOMAIN_BLOCKED (0U) #define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT) @@ -90,6 +93,7 @@ struct iommu_domain_geometry { __IOMMU_DOMAIN_DMA_API | \ __IOMMU_DOMAIN_DMA_FQ) #define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SVA) +#define IOMMU_DOMAIN_PLATFORM (__IOMMU_DOMAIN_PLATFORM) struct iommu_domain { unsigned type; @@ -250,6 +254,7 @@ struct iommu_iotlb_gather { * @owner: Driver module providing these ops * @identity_domain: An always available, always attachable identity * translation. + * @default_domain: If not NULL this will always be set as the default domain. */ struct iommu_ops { bool (*capable)(struct device *dev, enum iommu_cap); @@ -284,6 +289,7 @@ struct iommu_ops { unsigned long pgsize_bitmap; struct module *owner; struct iommu_domain *identity_domain; + struct iommu_domain *default_domain; }; /**