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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 | ||
27 | static const struct io_pgtable_init_fns * | |
28 | io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = | |
29 | { | |
e1d3c0fd WD |
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 | |
fdb1d7be WD |
36 | }; |
37 | ||
38 | struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt, | |
39 | struct io_pgtable_cfg *cfg, | |
40 | void *cookie) | |
41 | { | |
42 | struct io_pgtable *iop; | |
43 | const struct io_pgtable_init_fns *fns; | |
44 | ||
45 | if (fmt >= IO_PGTABLE_NUM_FMTS) | |
46 | return NULL; | |
47 | ||
48 | fns = io_pgtable_init_table[fmt]; | |
49 | if (!fns) | |
50 | return NULL; | |
51 | ||
52 | iop = fns->alloc(cfg, cookie); | |
53 | if (!iop) | |
54 | return NULL; | |
55 | ||
56 | iop->fmt = fmt; | |
57 | iop->cookie = cookie; | |
58 | iop->cfg = *cfg; | |
59 | ||
60 | return &iop->ops; | |
61 | } | |
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 | */ | |
67 | void free_io_pgtable_ops(struct io_pgtable_ops *ops) | |
68 | { | |
69 | struct io_pgtable *iop; | |
70 | ||
71 | if (!ops) | |
72 | return; | |
73 | ||
74 | iop = container_of(ops, struct io_pgtable, ops); | |
75 | iop->cfg.tlb->tlb_flush_all(iop->cookie); | |
76 | io_pgtable_init_table[iop->fmt]->free(iop); | |
77 | } |