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iommu: Allow io-pgtable to be used outside of drivers/iommu/

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Move io-pgtable.h to include/linux/ and export alloc_io_pgtable_ops
and free_io_pgtable_ops. This enables drivers outside drivers/iommu/ to
use the page table library. Specifically, some ARM Mali GPUs use the
ARM page table formats.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: iommu@lists.linux-foundation.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Rob Herring 2019-02-05 10:37:31 -06:00 • committed by Joerg Roedel
parent c61a4633a5
commit b77cf11f09
10 changed files with 11 additions and 15 deletions
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213
include/linux/io-pgtable.h Normal file
View file

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __IO_PGTABLE_H
#define __IO_PGTABLE_H
#include <linux/bitops.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,
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, size_t granule,
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 {
/*
* 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_TLBI_ON_MAP: If the format forbids caching invalid
* (unmapped) entries but the hardware might do so anyway, perform
* TLB maintenance when mapping as well as when unmapping.
*
* IO_PGTABLE_QUIRK_ARM_MTK_4GB: (ARM v7s format) Set bit 9 in all
* PTEs, for Mediatek IOMMUs which treat it as a 33rd address bit
* when the SoC is in "4GB mode" and they can only access the high
* remap of DRAM (0x1_00000000 to 0x1_ffffffff).
*
* IO_PGTABLE_QUIRK_NO_DMA: Guarantees that the tables will only ever
* be accessed by a fully cache-coherent IOMMU or CPU (e.g. for a
* software-emulated IOMMU), such that pagetable updates need not
* be treated as explicit DMA data.
*
* IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs
* on unmap, for DMA domains using the flush queue mechanism for
* delayed invalidation.
*/
#define IO_PGTABLE_QUIRK_ARM_NS BIT(0)
#define IO_PGTABLE_QUIRK_NO_PERMS BIT(1)
#define IO_PGTABLE_QUIRK_TLBI_ON_MAP BIT(2)
#define IO_PGTABLE_QUIRK_ARM_MTK_4GB BIT(3)
#define IO_PGTABLE_QUIRK_NO_DMA BIT(4)
#define IO_PGTABLE_QUIRK_NON_STRICT BIT(5)
unsigned long 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 {
u32 ttbr[2];
u32 tcr;
u32 nmrr;
u32 prrr;
} arm_v7s_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);
size_t (*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;
};
#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)
{
iop->cfg.tlb->tlb_flush_all(iop->cookie);
}
static inline void io_pgtable_tlb_add_flush(struct io_pgtable *iop,
unsigned long iova, size_t size, size_t granule, bool leaf)
{
iop->cfg.tlb->tlb_add_flush(iova, size, granule, leaf, iop->cookie);
}
static inline void io_pgtable_tlb_sync(struct io_pgtable *iop)
{
iop->cfg.tlb->tlb_sync(iop->cookie);
}
/**
* 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;
extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns;
#endif /* __IO_PGTABLE_H */