| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * Generic page table allocator for IOMMUs. |
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| 4 | * |
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| 5 | * Copyright (C) 2014 ARM Limited |
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| 6 | * |
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| 7 | * Author: Will Deacon <will.deacon@arm.com> |
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| 8 | */ |
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| 9 | |
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| 10 | #include <linux/bug.h> |
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| 11 | #include <linux/io-pgtable.h> |
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| 12 | #include <linux/kernel.h> |
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| 13 | #include <linux/types.h> |
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| 14 | |
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| 15 | static const struct io_pgtable_init_fns * |
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| 16 | io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = { |
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| 17 | #ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE |
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| 18 | [ARM_32_LPAE_S1] = &io_pgtable_arm_32_lpae_s1_init_fns, |
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| 19 | [ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns, |
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| 20 | [ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns, |
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| 21 | [ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns, |
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| 22 | [ARM_MALI_LPAE] = &io_pgtable_arm_mali_lpae_init_fns, |
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| 23 | #endif |
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| 24 | #ifdef CONFIG_IOMMU_IO_PGTABLE_DART |
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| 25 | [APPLE_DART] = &io_pgtable_apple_dart_init_fns, |
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| 26 | [APPLE_DART2] = &io_pgtable_apple_dart_init_fns, |
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| 27 | #endif |
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| 28 | #ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S |
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| 29 | [ARM_V7S] = &io_pgtable_arm_v7s_init_fns, |
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| 30 | #endif |
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| 31 | #ifdef CONFIG_AMD_IOMMU |
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| 32 | [AMD_IOMMU_V1] = &io_pgtable_amd_iommu_v1_init_fns, |
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| 33 | [AMD_IOMMU_V2] = &io_pgtable_amd_iommu_v2_init_fns, |
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| 34 | #endif |
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| 35 | }; |
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| 36 | |
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| 37 | struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt, |
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| 38 | struct io_pgtable_cfg *cfg, |
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| 39 | void *cookie) |
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| 40 | { |
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| 41 | struct io_pgtable *iop; |
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| 42 | const struct io_pgtable_init_fns *fns; |
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| 43 | |
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| 44 | if (fmt >= IO_PGTABLE_NUM_FMTS) |
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| 45 | return NULL; |
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| 46 | |
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| 47 | fns = io_pgtable_init_table[fmt]; |
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| 48 | if (!fns) |
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| 49 | return NULL; |
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| 50 | |
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| 51 | iop = fns->alloc(cfg, cookie); |
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| 52 | if (!iop) |
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| 53 | return NULL; |
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| 54 | |
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| 55 | iop->fmt = fmt; |
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| 56 | iop->cookie = cookie; |
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| 57 | iop->cfg = *cfg; |
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| 58 | |
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| 59 | return &iop->ops; |
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| 60 | } |
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| 61 | EXPORT_SYMBOL_GPL(alloc_io_pgtable_ops); |
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| 62 | |
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| 63 | /* |
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| 64 | * It is the IOMMU driver's responsibility to ensure that the page table |
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| 65 | * is no longer accessible to the walker by this point. |
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| 66 | */ |
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| 67 | void free_io_pgtable_ops(struct io_pgtable_ops *ops) |
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| 68 | { |
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| 69 | struct io_pgtable *iop; |
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| 70 | |
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| 71 | if (!ops) |
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| 72 | return; |
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| 73 | |
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| 74 | iop = io_pgtable_ops_to_pgtable(ops); |
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| 75 | io_pgtable_tlb_flush_all(iop); |
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| 76 | io_pgtable_init_table[iop->fmt]->free(iop); |
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| 77 | } |
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| 78 | EXPORT_SYMBOL_GPL(free_io_pgtable_ops); |
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| 79 | |
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