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_ARMV7S 25 [ARM_V7S] = &io_pgtable_arm_v7s_init_fns, 26 #endif 27 #ifdef CONFIG_AMD_IOMMU 28 [AMD_IOMMU_V1] = &io_pgtable_amd_iommu_v1_init_fns, 29 #endif 30 }; 31 32 struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt, 33 struct io_pgtable_cfg *cfg, 34 void *cookie) 35 { 36 struct io_pgtable *iop; 37 const struct io_pgtable_init_fns *fns; 38 39 if (fmt >= IO_PGTABLE_NUM_FMTS) 40 return NULL; 41 42 fns = io_pgtable_init_table[fmt]; 43 if (!fns) 44 return NULL; 45 46 iop = fns->alloc(cfg, cookie); 47 if (!iop) 48 return NULL; 49 50 iop->fmt = fmt; 51 iop->cookie = cookie; 52 iop->cfg = *cfg; 53 54 return &iop->ops; 55 } 56 EXPORT_SYMBOL_GPL(alloc_io_pgtable_ops); 57 58 /* 59 * It is the IOMMU driver's responsibility to ensure that the page table 60 * is no longer accessible to the walker by this point. 61 */ 62 void free_io_pgtable_ops(struct io_pgtable_ops *ops) 63 { 64 struct io_pgtable *iop; 65 66 if (!ops) 67 return; 68 69 iop = io_pgtable_ops_to_pgtable(ops); 70 io_pgtable_tlb_flush_all(iop); 71 io_pgtable_init_table[iop->fmt]->free(iop); 72 } 73 EXPORT_SYMBOL_GPL(free_io_pgtable_ops); 74