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_ARMV7S
25	[ARM_V7S] = &io_pgtable_arm_v7s_init_fns,
26#endif
27};
28
29struct 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}
53EXPORT_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 */
59void 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}
70EXPORT_SYMBOL_GPL(free_io_pgtable_ops);

 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_ARMV7S
25	[ARM_V7S] = &io_pgtable_arm_v7s_init_fns,
26#endif
27};
28
29struct 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}
53EXPORT_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 */
59void 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);
67	io_pgtable_tlb_flush_all(iop);
68	io_pgtable_init_table[iop->fmt]->free(iop);
69}
70EXPORT_SYMBOL_GPL(free_io_pgtable_ops);