diff options
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 76 |
1 files changed, 60 insertions, 16 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 156732807994..c30d12e16473 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -14,6 +14,7 @@ #include <linux/err.h> #include <linux/of.h> #include <linux/iova_bitmap.h> +#include <uapi/linux/iommufd.h> #define IOMMU_READ (1 << 0) #define IOMMU_WRITE (1 << 1) @@ -558,12 +559,52 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size, } /** + * __iommu_copy_struct_to_user - Report iommu driver specific user space data + * @dst_data: Pointer to a struct iommu_user_data for user space data location + * @src_data: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @data_type: The data type of the @src_data. Must match with @dst_data.type + * @data_len: Length of current user data structure, i.e. sizeof(struct _src) + * @min_len: Initial length of user data structure for backward compatibility. + * This should be offsetofend using the last member in the user data + * struct that was initially added to include/uapi/linux/iommufd.h + */ +static inline int +__iommu_copy_struct_to_user(const struct iommu_user_data *dst_data, + void *src_data, unsigned int data_type, + size_t data_len, size_t min_len) +{ + if (WARN_ON(!dst_data || !src_data)) + return -EINVAL; + if (dst_data->type != data_type) + return -EINVAL; + if (dst_data->len < min_len || data_len < dst_data->len) + return -EINVAL; + return copy_struct_to_user(dst_data->uptr, dst_data->len, src_data, + data_len, NULL); +} + +/** + * iommu_copy_struct_to_user - Report iommu driver specific user space data + * @user_data: Pointer to a struct iommu_user_data for user space data location + * @ksrc: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @data_type: The data type of the @ksrc. Must match with @user_data->type + * @min_last: The last member of the data structure @ksrc points in the initial + * version. + * Return 0 for success, otherwise -error. + */ +#define iommu_copy_struct_to_user(user_data, ksrc, data_type, min_last) \ + __iommu_copy_struct_to_user(user_data, ksrc, data_type, sizeof(*ksrc), \ + offsetofend(typeof(*ksrc), min_last)) + +/** * struct iommu_ops - iommu ops and capabilities * @capable: check capability * @hw_info: report iommu hardware information. The data buffer returned by this * op is allocated in the iommu driver and freed by the caller after - * use. The information type is one of enum iommu_hw_info_type defined - * in include/uapi/linux/iommufd.h. + * use. @type can input a requested type and output a supported type. + * Driver should reject an unsupported data @type input * @domain_alloc: Do not use in new drivers * @domain_alloc_identity: allocate an IDENTITY domain. Drivers should prefer to * use identity_domain instead. This should only be used @@ -596,15 +637,16 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size, * - IOMMU_DOMAIN_DMA: must use a dma domain * - 0: use the default setting * @default_domain_ops: the default ops for domains - * @viommu_alloc: Allocate an iommufd_viommu on a physical IOMMU instance behind - * the @dev, as the set of virtualization resources shared/passed - * to user space IOMMU instance. And associate it with a nesting - * @parent_domain. The @viommu_type must be defined in the header - * include/uapi/linux/iommufd.h - * It is required to call iommufd_viommu_alloc() helper for - * a bundled allocation of the core and the driver structures, - * using the given @ictx pointer. - * @pgsize_bitmap: bitmap of all possible supported page sizes + * @get_viommu_size: Get the size of a driver-level vIOMMU structure for a given + * @dev corresponding to @viommu_type. Driver should return 0 + * if vIOMMU isn't supported accordingly. It is required for + * driver to use the VIOMMU_STRUCT_SIZE macro to sanitize the + * driver-level vIOMMU structure related to the core one + * @viommu_init: Init the driver-level struct of an iommufd_viommu on a physical + * IOMMU instance @viommu->iommu_dev, as the set of virtualization + * resources shared/passed to user space IOMMU instance. Associate + * it with a nesting @parent_domain. It is required for driver to + * set @viommu->ops pointing to its own viommu_ops * @owner: Driver module providing these ops * @identity_domain: An always available, always attachable identity * translation. @@ -620,7 +662,8 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size, */ struct iommu_ops { bool (*capable)(struct device *dev, enum iommu_cap); - void *(*hw_info)(struct device *dev, u32 *length, u32 *type); + void *(*hw_info)(struct device *dev, u32 *length, + enum iommu_hw_info_type *type); /* Domain allocation and freeing by the iommu driver */ #if IS_ENABLED(CONFIG_FSL_PAMU) @@ -654,12 +697,13 @@ struct iommu_ops { int (*def_domain_type)(struct device *dev); - struct iommufd_viommu *(*viommu_alloc)( - struct device *dev, struct iommu_domain *parent_domain, - struct iommufd_ctx *ictx, unsigned int viommu_type); + size_t (*get_viommu_size)(struct device *dev, + enum iommu_viommu_type viommu_type); + int (*viommu_init)(struct iommufd_viommu *viommu, + struct iommu_domain *parent_domain, + const struct iommu_user_data *user_data); const struct iommu_domain_ops *default_domain_ops; - unsigned long pgsize_bitmap; struct module *owner; struct iommu_domain *identity_domain; struct iommu_domain *blocked_domain; |