io-pgtable.h
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#ifndef __IO_PGTABLE_H
#define __IO_PGTABLE_H
/*
* Public API for use by IOMMU drivers
*/
enum io_pgtable_fmt {
ARM_32_LPAE_S1,
ARM_32_LPAE_S2,
ARM_64_LPAE_S1,
ARM_64_LPAE_S2,
IO_PGTABLE_NUM_FMTS,
};
/**
* struct iommu_gather_ops - IOMMU callbacks for TLB and page table management.
*
* @tlb_flush_all: Synchronously invalidate the entire TLB context.
* @tlb_add_flush: Queue up a TLB invalidation for a virtual address range.
* @tlb_sync: Ensure any queued TLB invalidation has taken effect, and
* any corresponding page table updates are visible to the
* IOMMU.
*
* Note that these can all be called in atomic context and must therefore
* not block.
*/
struct iommu_gather_ops {
void (*tlb_flush_all)(void *cookie);
void (*tlb_add_flush)(unsigned long iova, size_t size, bool leaf,
void *cookie);
void (*tlb_sync)(void *cookie);
};
/**
* 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.
* @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 {
#define IO_PGTABLE_QUIRK_ARM_NS (1 << 0) /* Set NS bit in PTEs */
int quirks;
unsigned long pgsize_bitmap;
unsigned int ias;
unsigned int oas;
const struct iommu_gather_ops *tlb;
struct device *iommu_dev;
/* Low-level data specific to the table format */
union {
struct {
u64 ttbr[2];
u64 tcr;
u64 mair[2];
} arm_lpae_s1_cfg;
struct {
u64 vttbr;
u64 vtcr;
} arm_lpae_s2_cfg;
};
};
/**
* struct io_pgtable_ops - Page table manipulation API for IOMMU drivers.
*
* @map: Map a physically contiguous memory region.
* @unmap: Unmap a physically contiguous memory region.
* @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 {
int (*map)(struct io_pgtable_ops *ops, unsigned long iova,
phys_addr_t paddr, size_t size, int prot);
int (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
size_t size);
phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
unsigned long iova);
};
/**
* 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 {
enum io_pgtable_fmt fmt;
void *cookie;
struct io_pgtable_cfg cfg;
struct io_pgtable_ops ops;
};
/**
* 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.
*/
struct io_pgtable_init_fns {
struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie);
void (*free)(struct io_pgtable *iop);
};
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;
#endif /* __IO_PGTABLE_H */