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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
15static const struct io_pgtable_init_fns *
16io_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 [APPLE_DART] = &io_pgtable_apple_dart_init_fns,
24#endif
25#ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S
26 [ARM_V7S] = &io_pgtable_arm_v7s_init_fns,
27#endif
28#ifdef CONFIG_AMD_IOMMU
29 [AMD_IOMMU_V1] = &io_pgtable_amd_iommu_v1_init_fns,
30#endif
31};
32
33struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
34 struct io_pgtable_cfg *cfg,
35 void *cookie)
36{
37 struct io_pgtable *iop;
38 const struct io_pgtable_init_fns *fns;
39
40 if (fmt >= IO_PGTABLE_NUM_FMTS)
41 return NULL;
42
43 fns = io_pgtable_init_table[fmt];
44 if (!fns)
45 return NULL;
46
47 iop = fns->alloc(cfg, cookie);
48 if (!iop)
49 return NULL;
50
51 iop->fmt = fmt;
52 iop->cookie = cookie;
53 iop->cfg = *cfg;
54
55 return &iop->ops;
56}
57EXPORT_SYMBOL_GPL(alloc_io_pgtable_ops);
58
59/*
60 * It is the IOMMU driver's responsibility to ensure that the page table
61 * is no longer accessible to the walker by this point.
62 */
63void free_io_pgtable_ops(struct io_pgtable_ops *ops)
64{
65 struct io_pgtable *iop;
66
67 if (!ops)
68 return;
69
70 iop = io_pgtable_ops_to_pgtable(ops);
71 io_pgtable_tlb_flush_all(iop);
72 io_pgtable_init_table[iop->fmt]->free(iop);
73}
74EXPORT_SYMBOL_GPL(free_io_pgtable_ops);