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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d1e5f26f14
TTBR1 values have so far been redundant since no users implement any support for split address spaces. Crucially, though, one of the main reasons for wanting to do so is to be able to manage each half entirely independently, e.g. context-switching one set of mappings without disturbing the other. Thus it seems unlikely that tying two tables together in a single io_pgtable_cfg would ever be particularly desirable or useful. Streamline the configs to just a single conceptual TTBR value representing the allocated table. This paves the way for future users to support split address spaces by simply allocating a table and dealing with the detailed TTBRn logistics themselves. Tested-by: Jordan Crouse <jcrouse@codeaurora.org> Signed-off-by: Robin Murphy <robin.murphy@arm.com> [will: Drop change to ttbr value] Signed-off-by: Will Deacon <will@kernel.org>
240 lines
7.8 KiB
C
240 lines
7.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __IO_PGTABLE_H
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#define __IO_PGTABLE_H
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#include <linux/bitops.h>
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#include <linux/iommu.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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ARM_V7S,
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ARM_MALI_LPAE,
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IO_PGTABLE_NUM_FMTS,
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};
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/**
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* struct iommu_flush_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_flush_walk: Synchronously invalidate all intermediate TLB state
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* (sometimes referred to as the "walk cache") for a virtual
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* address range.
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* @tlb_flush_leaf: Synchronously invalidate all leaf TLB state for a virtual
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* address range.
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* @tlb_add_page: Optional callback to queue up leaf TLB invalidation for a
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* single page. IOMMUs that cannot batch TLB invalidation
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* operations efficiently will typically issue them here, but
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* others may decide to update the iommu_iotlb_gather structure
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* and defer the invalidation until iommu_tlb_sync() instead.
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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_flush_ops {
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void (*tlb_flush_all)(void *cookie);
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void (*tlb_flush_walk)(unsigned long iova, size_t size, size_t granule,
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void *cookie);
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void (*tlb_flush_leaf)(unsigned long iova, size_t size, size_t granule,
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void *cookie);
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void (*tlb_add_page)(struct iommu_iotlb_gather *gather,
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unsigned long iova, size_t granule, 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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* @coherent_walk A flag to indicate whether or not page table walks made
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* by the IOMMU are coherent with the CPU caches.
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* @tlb: TLB management callbacks for this set of tables.
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* @iommu_dev: The device representing the DMA configuration for the
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* page table walker.
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*/
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struct io_pgtable_cfg {
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/*
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* IO_PGTABLE_QUIRK_ARM_NS: (ARM formats) Set NS and NSTABLE bits in
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* stage 1 PTEs, for hardware which insists on validating them
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* even in non-secure state where they should normally be ignored.
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*
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* IO_PGTABLE_QUIRK_NO_PERMS: Ignore the IOMMU_READ, IOMMU_WRITE and
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* IOMMU_NOEXEC flags and map everything with full access, for
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* hardware which does not implement the permissions of a given
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* format, and/or requires some format-specific default value.
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*
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* IO_PGTABLE_QUIRK_TLBI_ON_MAP: If the format forbids caching invalid
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* (unmapped) entries but the hardware might do so anyway, perform
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* TLB maintenance when mapping as well as when unmapping.
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*
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* IO_PGTABLE_QUIRK_ARM_MTK_EXT: (ARM v7s format) MediaTek IOMMUs extend
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* to support up to 34 bits PA where the bit32 and bit33 are
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* encoded in the bit9 and bit4 of the PTE respectively.
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*
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* IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs
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* on unmap, for DMA domains using the flush queue mechanism for
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* delayed invalidation.
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*/
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#define IO_PGTABLE_QUIRK_ARM_NS BIT(0)
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#define IO_PGTABLE_QUIRK_NO_PERMS BIT(1)
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#define IO_PGTABLE_QUIRK_TLBI_ON_MAP BIT(2)
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#define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3)
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#define IO_PGTABLE_QUIRK_NON_STRICT BIT(4)
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unsigned long 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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bool coherent_walk;
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const struct iommu_flush_ops *tlb;
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struct device *iommu_dev;
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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;
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u64 tcr;
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u64 mair;
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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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struct {
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u32 ttbr;
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u32 tcr;
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u32 nmrr;
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u32 prrr;
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} arm_v7s_cfg;
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struct {
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u64 transtab;
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u64 memattr;
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} arm_mali_lpae_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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size_t (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
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size_t size, struct iommu_iotlb_gather *gather);
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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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#define io_pgtable_ops_to_pgtable(x) container_of((x), struct io_pgtable, ops)
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static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop)
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{
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iop->cfg.tlb->tlb_flush_all(iop->cookie);
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}
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static inline void
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io_pgtable_tlb_flush_walk(struct io_pgtable *iop, unsigned long iova,
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size_t size, size_t granule)
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{
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iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie);
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}
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static inline void
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io_pgtable_tlb_flush_leaf(struct io_pgtable *iop, unsigned long iova,
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size_t size, size_t granule)
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{
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iop->cfg.tlb->tlb_flush_leaf(iova, size, granule, iop->cookie);
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}
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static inline void
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io_pgtable_tlb_add_page(struct io_pgtable *iop,
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struct iommu_iotlb_gather * gather, unsigned long iova,
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size_t granule)
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{
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if (iop->cfg.tlb->tlb_add_page)
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iop->cfg.tlb->tlb_add_page(gather, iova, granule, iop->cookie);
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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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extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns;
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extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns;
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extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns;
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extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns;
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extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns;
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extern struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns;
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#endif /* __IO_PGTABLE_H */
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