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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; }; /**