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/* 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 {
ARM_32_LPAE_S1,
ARM_32_LPAE_S2,
ARM_64_LPAE_S1,
ARM_64_LPAE_S2,
ARM_V7S,
ARM_MALI_LPAE,
AMD_IOMMU_V1,
AMD_IOMMU_V2,
APPLE_DART,
APPLE_DART2,
IO_PGTABLE_NUM_FMTS,
};
/**
* 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 {
void (*tlb_flush_all)(void *cookie);
void (*tlb_flush_walk)(unsigned long iova, size_t size, size_t granule,
void *cookie);
void (*tlb_add_page)(struct iommu_iotlb_gather *gather,
unsigned long iova, size_t granule, 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.
* @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 {
/*
* IO_PGTABLE_QUIRK_ARM_NS: (ARM formats) Set NS and NSTABLE bits in
* stage 1 PTEs, for hardware which insists on validating them
* even in non-secure state where they should normally be ignored.
*
* IO_PGTABLE_QUIRK_NO_PERMS: Ignore the IOMMU_READ, IOMMU_WRITE and
* IOMMU_NOEXEC flags and map everything with full access, for
* hardware which does not implement the permissions of a given
* format, and/or requires some format-specific default value.
*
* IO_PGTABLE_QUIRK_ARM_MTK_EXT: (ARM v7s format) MediaTek IOMMUs extend
* to support up to 35 bits PA where the bit32, bit33 and bit34 are
* encoded in the bit9, bit4 and bit5 of the PTE respectively.
*
* IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT: (ARM v7s format) MediaTek IOMMUs
* extend the translation table base support up to 35 bits PA, the
* encoding format is same with IO_PGTABLE_QUIRK_ARM_MTK_EXT.
*
* IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table
* for use in the upper half of a split address space.
*
* IO_PGTABLE_QUIRK_ARM_OUTER_WBWA: Override the outer-cacheability
* attributes set in the TCR for a non-coherent page-table walker.
*/
#define IO_PGTABLE_QUIRK_ARM_NS BIT(0)
#define IO_PGTABLE_QUIRK_NO_PERMS BIT(1)
#define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3)
#define IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT BIT(4)
#define IO_PGTABLE_QUIRK_ARM_TTBR1 BIT(5)
#define IO_PGTABLE_QUIRK_ARM_OUTER_WBWA BIT(6)
unsigned long quirks;
unsigned long pgsize_bitmap;
unsigned int ias;
unsigned int oas;
bool coherent_walk;
const struct iommu_flush_ops *tlb;
struct device *iommu_dev;
/**
* @alloc: Custom page allocator.
*
* Optional hook used to allocate page tables. If this function is NULL,
* @free must be NULL too.
*
* Memory returned should be zeroed and suitable for dma_map_single() and
* virt_to_phys().
*
* Not all formats support custom page allocators. Before considering
* passing a non-NULL value, make sure the chosen page format supports
* this feature.
*/
void *(*alloc)(void *cookie, size_t size, gfp_t gfp);
/**
* @free: Custom page de-allocator.
*
* Optional hook used to free page tables allocated with the @alloc
* hook. Must be non-NULL if @alloc is not NULL, must be NULL
* otherwise.
*/
void (*free)(void *cookie, void *pages, size_t size);
/* Low-level data specific to the table format */
union {
struct {
u64 ttbr;
struct {
u32 ips:3;
u32 tg:2;
u32 sh:2;
u32 orgn:2;
u32 irgn:2;
u32 tsz:6;
} tcr;
u64 mair;
} arm_lpae_s1_cfg;
struct {
u64 vttbr;
struct {
u32 ps:3;
u32 tg:2;
u32 sh:2;
u32 orgn:2;
u32 irgn:2;
u32 sl:2;
u32 tsz:6;
} vtcr;
} arm_lpae_s2_cfg;
struct {
u32 ttbr;
u32 tcr;
u32 nmrr;
u32 prrr;
} arm_v7s_cfg;
struct {
u64 transtab;
u64 memattr;
} arm_mali_lpae_cfg;
struct {
u64 ttbr[4];
u32 n_ttbrs;
} apple_dart_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 {
int (*map_pages)(struct io_pgtable_ops *ops, unsigned long iova,
phys_addr_t paddr, size_t pgsize, size_t pgcount,
int prot, gfp_t gfp, size_t *mapped);
size_t (*unmap_pages)(struct io_pgtable_ops *ops, unsigned long iova,
size_t pgsize, size_t pgcount,
struct iommu_iotlb_gather *gather);
phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
unsigned long iova);
int (*read_and_clear_dirty)(struct io_pgtable_ops *ops,
unsigned long iova, size_t size,
unsigned long flags,
struct iommu_dirty_bitmap *dirty);
};
/**
* 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;
};
#define io_pgtable_ops_to_pgtable(x) container_of((x), struct io_pgtable, ops)
static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop)
{
if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_all)
iop->cfg.tlb->tlb_flush_all(iop->cookie);
}
static inline void
io_pgtable_tlb_flush_walk(struct io_pgtable *iop, unsigned long iova,
size_t size, size_t granule)
{
if (iop->cfg.tlb && iop->cfg.tlb->tlb_flush_walk)
iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie);
}
static inline void
io_pgtable_tlb_add_page(struct io_pgtable *iop,
struct iommu_iotlb_gather * gather, unsigned long iova,
size_t granule)
{
if (iop->cfg.tlb && iop->cfg.tlb->tlb_add_page)
iop->cfg.tlb->tlb_add_page(gather, iova, granule, iop->cookie);
}
/**
* enum io_pgtable_caps - IO page table backend capabilities.
*/
enum io_pgtable_caps {
/** @IO_PGTABLE_CAP_CUSTOM_ALLOCATOR: Backend accepts custom page table allocators. */
IO_PGTABLE_CAP_CUSTOM_ALLOCATOR = BIT(0),
};
/**
* 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 {
struct io_pgtable *(*alloc)(struct io_pgtable_cfg *cfg, void *cookie);
void (*free)(struct io_pgtable *iop);
u32 caps;
};
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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