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/*
 2 * Generic page table allocator for IOMMUs.
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 *
 8 * This program is distributed in the hope that it will be useful,
 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15 *
16 * Copyright (C) 2014 ARM Limited
17 *
18 * Author: Will Deacon <will.deacon@arm.com>
19 */
20
21#include <linux/bug.h>
 
22#include <linux/kernel.h>
23#include <linux/types.h>
24
25#include "io-pgtable.h"
26
27static const struct io_pgtable_init_fns *
28io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] =
29{
30#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE
31	[ARM_32_LPAE_S1] = &io_pgtable_arm_32_lpae_s1_init_fns,
32	[ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns,
33	[ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns,
34	[ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns,
 
35#endif
36#ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S
37	[ARM_V7S] = &io_pgtable_arm_v7s_init_fns,
38#endif
39};
40
41struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
42					    struct io_pgtable_cfg *cfg,
43					    void *cookie)
44{
45	struct io_pgtable *iop;
46	const struct io_pgtable_init_fns *fns;
47
48	if (fmt >= IO_PGTABLE_NUM_FMTS)
49		return NULL;
50
51	fns = io_pgtable_init_table[fmt];
52	if (!fns)
53		return NULL;
54
55	iop = fns->alloc(cfg, cookie);
56	if (!iop)
57		return NULL;
58
59	iop->fmt	= fmt;
60	iop->cookie	= cookie;
61	iop->cfg	= *cfg;
62
63	return &iop->ops;
64}
 
65
66/*
67 * It is the IOMMU driver's responsibility to ensure that the page table
68 * is no longer accessible to the walker by this point.
69 */
70void free_io_pgtable_ops(struct io_pgtable_ops *ops)
71{
72	struct io_pgtable *iop;
73
74	if (!ops)
75		return;
76
77	iop = container_of(ops, struct io_pgtable, ops);
78	io_pgtable_tlb_flush_all(iop);
79	io_pgtable_init_table[iop->fmt]->free(iop);
80}