projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| fdb1d7be WD |
2 | /* |
| 3 | * Generic page table allocator for IOMMUs. | |
| 4 | * | |
| fdb1d7be WD |
5 | * Copyright (C) 2014 ARM Limited |
| 6 | * | |
| 7 | * Author: Will Deacon <will.deacon@arm.com> | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/bug.h> | |
| b77cf11f | 11 | #include <linux/io-pgtable.h> |
| fdb1d7be WD |
12 | #include <linux/kernel.h> |
| 13 | #include <linux/types.h> | |
| 14 | ||
| fdb1d7be | 15 | static const struct io_pgtable_init_fns * |
| 54c6d242 | 16 | io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = { |
| e1d3c0fd WD |
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, | |
| d08d42de | 22 | [ARM_MALI_LPAE] = &io_pgtable_arm_mali_lpae_init_fns, |
| e1d3c0fd | 23 | #endif |
| e5fc9753 RM |
24 | #ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S |
| 25 | [ARM_V7S] = &io_pgtable_arm_v7s_init_fns, | |
| 26 | #endif | |
| fdb1d7be WD |
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 | } | |
| b77cf11f | 53 | EXPORT_SYMBOL_GPL(alloc_io_pgtable_ops); |
| fdb1d7be WD |
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 = container_of(ops, struct io_pgtable, ops); | |
| 507e4c9d | 67 | io_pgtable_tlb_flush_all(iop); |
| fdb1d7be WD |
68 | io_pgtable_init_table[iop->fmt]->free(iop); |
| 69 | } | |
| b77cf11f | 70 | EXPORT_SYMBOL_GPL(free_io_pgtable_ops); |