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