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74 lines
1.8 KiB
74 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Generic page table allocator for IOMMUs. |
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* |
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* Copyright (C) 2014 ARM Limited |
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* |
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* Author: Will Deacon <[email protected]> |
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*/ |
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#include <linux/bug.h> |
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#include <linux/io-pgtable.h> |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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static const struct io_pgtable_init_fns * |
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io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = { |
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#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE |
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[ARM_32_LPAE_S1] = &io_pgtable_arm_32_lpae_s1_init_fns, |
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[ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns, |
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[ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns, |
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[ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns, |
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[ARM_MALI_LPAE] = &io_pgtable_arm_mali_lpae_init_fns, |
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[APPLE_DART] = &io_pgtable_apple_dart_init_fns, |
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#endif |
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#ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S |
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[ARM_V7S] = &io_pgtable_arm_v7s_init_fns, |
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#endif |
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#ifdef CONFIG_AMD_IOMMU |
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[AMD_IOMMU_V1] = &io_pgtable_amd_iommu_v1_init_fns, |
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#endif |
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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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struct io_pgtable *iop; |
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const struct io_pgtable_init_fns *fns; |
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if (fmt >= IO_PGTABLE_NUM_FMTS) |
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return NULL; |
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fns = io_pgtable_init_table[fmt]; |
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if (!fns) |
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return NULL; |
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iop = fns->alloc(cfg, cookie); |
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if (!iop) |
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return NULL; |
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iop->fmt = fmt; |
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iop->cookie = cookie; |
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iop->cfg = *cfg; |
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return &iop->ops; |
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} |
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EXPORT_SYMBOL_GPL(alloc_io_pgtable_ops); |
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/* |
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* It is the IOMMU driver's responsibility to ensure that the page table |
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* is no longer accessible to the walker by this point. |
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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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struct io_pgtable *iop; |
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if (!ops) |
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return; |
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iop = io_pgtable_ops_to_pgtable(ops); |
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io_pgtable_tlb_flush_all(iop); |
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io_pgtable_init_table[iop->fmt]->free(iop); |
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} |
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EXPORT_SYMBOL_GPL(free_io_pgtable_ops);
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