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#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
37struct 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}
61EXPORT_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 */
67void 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}
78EXPORT_SYMBOL_GPL(free_io_pgtable_ops);