/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __IO_PGTABLE_H #define __IO_PGTABLE_H #include <linux/bitops.h> #include <linux/iommu.h> /* * Public API for use by IOMMU drivers */ enum io_pgtable_fmt { … }; /** * struct iommu_flush_ops - IOMMU callbacks for TLB and page table management. * * @tlb_flush_all: Synchronously invalidate the entire TLB context. * @tlb_flush_walk: Synchronously invalidate all intermediate TLB state * (sometimes referred to as the "walk cache") for a virtual * address range. * @tlb_add_page: Optional callback to queue up leaf TLB invalidation for a * single page. IOMMUs that cannot batch TLB invalidation * operations efficiently will typically issue them here, but * others may decide to update the iommu_iotlb_gather structure * and defer the invalidation until iommu_iotlb_sync() instead. * * Note that these can all be called in atomic context and must therefore * not block. */ struct iommu_flush_ops { … }; /** * struct io_pgtable_cfg - Configuration data for a set of page tables. * * @quirks: A bitmap of hardware quirks that require some special * action by the low-level page table allocator. * @pgsize_bitmap: A bitmap of page sizes supported by this set of page * tables. * @ias: Input address (iova) size, in bits. * @oas: Output address (paddr) size, in bits. * @coherent_walk A flag to indicate whether or not page table walks made * by the IOMMU are coherent with the CPU caches. * @tlb: TLB management callbacks for this set of tables. * @iommu_dev: The device representing the DMA configuration for the * page table walker. */ struct io_pgtable_cfg { … }; /** * struct io_pgtable_ops - Page table manipulation API for IOMMU drivers. * * @map_pages: Map a physically contiguous range of pages of the same size. * @unmap_pages: Unmap a range of virtually contiguous pages of the same size. * @iova_to_phys: Translate iova to physical address. * * These functions map directly onto the iommu_ops member functions with * the same names. */ struct io_pgtable_ops { … }; /** * alloc_io_pgtable_ops() - Allocate a page table allocator for use by an IOMMU. * * @fmt: The page table format. * @cfg: The page table configuration. This will be modified to represent * the configuration actually provided by the allocator (e.g. the * pgsize_bitmap may be restricted). * @cookie: An opaque token provided by the IOMMU driver and passed back to * the callback routines in cfg->tlb. */ struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt, struct io_pgtable_cfg *cfg, void *cookie); /** * free_io_pgtable_ops() - Free an io_pgtable_ops structure. The caller * *must* ensure that the page table is no longer * live, but the TLB can be dirty. * * @ops: The ops returned from alloc_io_pgtable_ops. */ void free_io_pgtable_ops(struct io_pgtable_ops *ops); /* * Internal structures for page table allocator implementations. */ /** * struct io_pgtable - Internal structure describing a set of page tables. * * @fmt: The page table format. * @cookie: An opaque token provided by the IOMMU driver and passed back to * any callback routines. * @cfg: A copy of the page table configuration. * @ops: The page table operations in use for this set of page tables. */ struct io_pgtable { … }; #define io_pgtable_ops_to_pgtable(x) … static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop) { … } static inline void io_pgtable_tlb_flush_walk(struct io_pgtable *iop, unsigned long iova, size_t size, size_t granule) { … } static inline void io_pgtable_tlb_add_page(struct io_pgtable *iop, struct iommu_iotlb_gather * gather, unsigned long iova, size_t granule) { … } /** * enum io_pgtable_caps - IO page table backend capabilities. */ enum io_pgtable_caps { … }; /** * struct io_pgtable_init_fns - Alloc/free a set of page tables for a * particular format. * * @alloc: Allocate a set of page tables described by cfg. * @free: Free the page tables associated with iop. * @caps: Combination of @io_pgtable_caps flags encoding the backend capabilities. */ struct io_pgtable_init_fns { … }; extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns; extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns; extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns; extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns; extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns; extern struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns; extern struct io_pgtable_init_fns io_pgtable_amd_iommu_v1_init_fns; extern struct io_pgtable_init_fns io_pgtable_amd_iommu_v2_init_fns; extern struct io_pgtable_init_fns io_pgtable_apple_dart_init_fns; #endif /* __IO_PGTABLE_H */
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