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