144 lines
4.3 KiB
C
144 lines
4.3 KiB
C
#ifndef __IO_PGTABLE_H
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#define __IO_PGTABLE_H
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/*
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* Public API for use by IOMMU drivers
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*/
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enum io_pgtable_fmt {
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ARM_32_LPAE_S1,
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ARM_32_LPAE_S2,
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ARM_64_LPAE_S1,
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ARM_64_LPAE_S2,
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IO_PGTABLE_NUM_FMTS,
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};
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/**
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* struct iommu_gather_ops - IOMMU callbacks for TLB and page table management.
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*
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* @tlb_flush_all: Synchronously invalidate the entire TLB context.
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* @tlb_add_flush: Queue up a TLB invalidation for a virtual address range.
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* @tlb_sync: Ensure any queue TLB invalidation has taken effect.
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* @flush_pgtable: Ensure page table updates are visible to the IOMMU.
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*
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* Note that these can all be called in atomic context and must therefore
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* not block.
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*/
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struct iommu_gather_ops {
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void (*tlb_flush_all)(void *cookie);
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void (*tlb_add_flush)(unsigned long iova, size_t size, bool leaf,
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void *cookie);
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void (*tlb_sync)(void *cookie);
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void (*flush_pgtable)(void *ptr, size_t size, void *cookie);
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};
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/**
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* struct io_pgtable_cfg - Configuration data for a set of page tables.
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*
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* @quirks: A bitmap of hardware quirks that require some special
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* action by the low-level page table allocator.
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* @pgsize_bitmap: A bitmap of page sizes supported by this set of page
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* tables.
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* @ias: Input address (iova) size, in bits.
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* @oas: Output address (paddr) size, in bits.
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* @tlb: TLB management callbacks for this set of tables.
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*/
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struct io_pgtable_cfg {
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#define IO_PGTABLE_QUIRK_ARM_NS (1 << 0) /* Set NS bit in PTEs */
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int quirks;
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unsigned long pgsize_bitmap;
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unsigned int ias;
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unsigned int oas;
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const struct iommu_gather_ops *tlb;
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/* Low-level data specific to the table format */
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union {
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struct {
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u64 ttbr[2];
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u64 tcr;
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u64 mair[2];
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} arm_lpae_s1_cfg;
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struct {
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u64 vttbr;
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u64 vtcr;
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} arm_lpae_s2_cfg;
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};
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};
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/**
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* struct io_pgtable_ops - Page table manipulation API for IOMMU drivers.
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*
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* @map: Map a physically contiguous memory region.
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* @unmap: Unmap a physically contiguous memory region.
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* @iova_to_phys: Translate iova to physical address.
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*
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* These functions map directly onto the iommu_ops member functions with
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* the same names.
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*/
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struct io_pgtable_ops {
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int (*map)(struct io_pgtable_ops *ops, unsigned long iova,
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phys_addr_t paddr, size_t size, int prot);
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int (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
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size_t size);
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phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
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unsigned long iova);
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};
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/**
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* alloc_io_pgtable_ops() - Allocate a page table allocator for use by an IOMMU.
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*
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* @fmt: The page table format.
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* @cfg: The page table configuration. This will be modified to represent
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* the configuration actually provided by the allocator (e.g. the
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* pgsize_bitmap may be restricted).
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* @cookie: An opaque token provided by the IOMMU driver and passed back to
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* the callback routines in cfg->tlb.
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*/
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struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
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struct io_pgtable_cfg *cfg,
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void *cookie);
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/**
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* free_io_pgtable_ops() - Free an io_pgtable_ops structure. The caller
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* *must* ensure that the page table is no longer
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* live, but the TLB can be dirty.
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*
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* @ops: The ops returned from alloc_io_pgtable_ops.
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*/
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void free_io_pgtable_ops(struct io_pgtable_ops *ops);
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/*
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* Internal structures for page table allocator implementations.
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*/
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/**
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* struct io_pgtable - Internal structure describing a set of page tables.
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*
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* @fmt: The page table format.
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* @cookie: An opaque token provided by the IOMMU driver and passed back to
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* any callback routines.
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* @cfg: A copy of the page table configuration.
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* @ops: The page table operations in use for this set of page tables.
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*/
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struct io_pgtable {
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enum io_pgtable_fmt fmt;
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void *cookie;
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struct io_pgtable_cfg cfg;
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struct io_pgtable_ops ops;
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};
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/**
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* struct io_pgtable_init_fns - Alloc/free a set of page tables for a
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* particular format.
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*
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* @alloc: Allocate a set of page tables described by cfg.
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* @free: Free the page tables associated with iop.
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*/
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struct io_pgtable_init_fns {
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struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie);
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void (*free)(struct io_pgtable *iop);
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};
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#endif /* __IO_PGTABLE_H */
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