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fdb1d7be WD |
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 | ||
e1d3c0fd WD |
27 | extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns; |
28 | extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns; | |
29 | extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns; | |
30 | extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns; | |
31 | ||
fdb1d7be WD |
32 | static const struct io_pgtable_init_fns * |
33 | io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = | |
34 | { | |
e1d3c0fd WD |
35 | #ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE |
36 | [ARM_32_LPAE_S1] = &io_pgtable_arm_32_lpae_s1_init_fns, | |
37 | [ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns, | |
38 | [ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns, | |
39 | [ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns, | |
40 | #endif | |
fdb1d7be WD |
41 | }; |
42 | ||
43 | struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt, | |
44 | struct io_pgtable_cfg *cfg, | |
45 | void *cookie) | |
46 | { | |
47 | struct io_pgtable *iop; | |
48 | const struct io_pgtable_init_fns *fns; | |
49 | ||
50 | if (fmt >= IO_PGTABLE_NUM_FMTS) | |
51 | return NULL; | |
52 | ||
53 | fns = io_pgtable_init_table[fmt]; | |
54 | if (!fns) | |
55 | return NULL; | |
56 | ||
57 | iop = fns->alloc(cfg, cookie); | |
58 | if (!iop) | |
59 | return NULL; | |
60 | ||
61 | iop->fmt = fmt; | |
62 | iop->cookie = cookie; | |
63 | iop->cfg = *cfg; | |
64 | ||
65 | return &iop->ops; | |
66 | } | |
67 | ||
68 | /* | |
69 | * It is the IOMMU driver's responsibility to ensure that the page table | |
70 | * is no longer accessible to the walker by this point. | |
71 | */ | |
72 | void free_io_pgtable_ops(struct io_pgtable_ops *ops) | |
73 | { | |
74 | struct io_pgtable *iop; | |
75 | ||
76 | if (!ops) | |
77 | return; | |
78 | ||
79 | iop = container_of(ops, struct io_pgtable, ops); | |
80 | iop->cfg.tlb->tlb_flush_all(iop->cookie); | |
81 | io_pgtable_init_table[iop->fmt]->free(iop); | |
82 | } |