projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 74ed87e7 TK |
2 | /* |
| 3 | * OMAP Crypto driver common support routines. | |
| 4 | * | |
| 5 | * Copyright (c) 2017 Texas Instruments Incorporated | |
| 6 | * Tero Kristo <t-kristo@ti.com> | |
| 74ed87e7 TK |
7 | */ |
| 8 | ||
| 9 | #include <linux/module.h> | |
| 10 | #include <linux/kernel.h> | |
| 11 | #include <linux/scatterlist.h> | |
| 12 | #include <crypto/scatterwalk.h> | |
| 13 | ||
| 14 | #include "omap-crypto.h" | |
| 15 | ||
| 16 | static int omap_crypto_copy_sg_lists(int total, int bs, | |
| 17 | struct scatterlist **sg, | |
| 18 | struct scatterlist *new_sg, u16 flags) | |
| 19 | { | |
| 20 | int n = sg_nents(*sg); | |
| 21 | struct scatterlist *tmp; | |
| 22 | ||
| 23 | if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY)) { | |
| 24 | new_sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL); | |
| 25 | if (!new_sg) | |
| 26 | return -ENOMEM; | |
| 27 | ||
| 28 | sg_init_table(new_sg, n); | |
| 29 | } | |
| 30 | ||
| 31 | tmp = new_sg; | |
| 32 | ||
| 33 | while (*sg && total) { | |
| 34 | int len = (*sg)->length; | |
| 35 | ||
| 36 | if (total < len) | |
| 37 | len = total; | |
| 38 | ||
| 39 | if (len > 0) { | |
| 40 | total -= len; | |
| 41 | sg_set_page(tmp, sg_page(*sg), len, (*sg)->offset); | |
| 42 | if (total <= 0) | |
| 43 | sg_mark_end(tmp); | |
| 44 | tmp = sg_next(tmp); | |
| 45 | } | |
| 46 | ||
| 47 | *sg = sg_next(*sg); | |
| 48 | } | |
| 49 | ||
| 50 | *sg = new_sg; | |
| 51 | ||
| 52 | return 0; | |
| 53 | } | |
| 54 | ||
| 55 | static int omap_crypto_copy_sgs(int total, int bs, struct scatterlist **sg, | |
| 56 | struct scatterlist *new_sg, u16 flags) | |
| 57 | { | |
| 58 | void *buf; | |
| 59 | int pages; | |
| 60 | int new_len; | |
| 61 | ||
| 62 | new_len = ALIGN(total, bs); | |
| 63 | pages = get_order(new_len); | |
| 64 | ||
| 65 | buf = (void *)__get_free_pages(GFP_ATOMIC, pages); | |
| 66 | if (!buf) { | |
| 67 | pr_err("%s: Couldn't allocate pages for unaligned cases.\n", | |
| 68 | __func__); | |
| 69 | return -ENOMEM; | |
| 70 | } | |
| 71 | ||
| 72 | if (flags & OMAP_CRYPTO_COPY_DATA) { | |
| 73 | scatterwalk_map_and_copy(buf, *sg, 0, total, 0); | |
| 74 | if (flags & OMAP_CRYPTO_ZERO_BUF) | |
| 75 | memset(buf + total, 0, new_len - total); | |
| 76 | } | |
| 77 | ||
| 78 | if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY)) | |
| 79 | sg_init_table(new_sg, 1); | |
| 80 | ||
| 81 | sg_set_buf(new_sg, buf, new_len); | |
| 82 | ||
| 83 | *sg = new_sg; | |
| 84 | ||
| 85 | return 0; | |
| 86 | } | |
| 87 | ||
| 88 | static int omap_crypto_check_sg(struct scatterlist *sg, int total, int bs, | |
| 89 | u16 flags) | |
| 90 | { | |
| 91 | int len = 0; | |
| 92 | int num_sg = 0; | |
| 93 | ||
| 94 | if (!IS_ALIGNED(total, bs)) | |
| 95 | return OMAP_CRYPTO_NOT_ALIGNED; | |
| 96 | ||
| 97 | while (sg) { | |
| 98 | num_sg++; | |
| 99 | ||
| 100 | if (!IS_ALIGNED(sg->offset, 4)) | |
| 101 | return OMAP_CRYPTO_NOT_ALIGNED; | |
| 102 | if (!IS_ALIGNED(sg->length, bs)) | |
| 103 | return OMAP_CRYPTO_NOT_ALIGNED; | |
| 065fa252 TK |
104 | #ifdef CONFIG_ZONE_DMA |
| 105 | if (page_zonenum(sg_page(sg)) != ZONE_DMA) | |
| 106 | return OMAP_CRYPTO_NOT_ALIGNED; | |
| 107 | #endif | |
| 74ed87e7 TK |
108 | |
| 109 | len += sg->length; | |
| 110 | sg = sg_next(sg); | |
| 111 | ||
| 112 | if (len >= total) | |
| 113 | break; | |
| 114 | } | |
| 115 | ||
| 116 | if ((flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY) && num_sg > 1) | |
| 117 | return OMAP_CRYPTO_NOT_ALIGNED; | |
| 118 | ||
| 119 | if (len != total) | |
| 120 | return OMAP_CRYPTO_BAD_DATA_LENGTH; | |
| 121 | ||
| 122 | return 0; | |
| 123 | } | |
| 124 | ||
| 125 | int omap_crypto_align_sg(struct scatterlist **sg, int total, int bs, | |
| 126 | struct scatterlist *new_sg, u16 flags, | |
| 127 | u8 flags_shift, unsigned long *dd_flags) | |
| 128 | { | |
| 129 | int ret; | |
| 130 | ||
| 131 | *dd_flags &= ~(OMAP_CRYPTO_COPY_MASK << flags_shift); | |
| 132 | ||
| 133 | if (flags & OMAP_CRYPTO_FORCE_COPY) | |
| 134 | ret = OMAP_CRYPTO_NOT_ALIGNED; | |
| 135 | else | |
| 136 | ret = omap_crypto_check_sg(*sg, total, bs, flags); | |
| 137 | ||
| 138 | if (ret == OMAP_CRYPTO_NOT_ALIGNED) { | |
| 139 | ret = omap_crypto_copy_sgs(total, bs, sg, new_sg, flags); | |
| 140 | if (ret) | |
| 141 | return ret; | |
| 142 | *dd_flags |= OMAP_CRYPTO_DATA_COPIED << flags_shift; | |
| 143 | } else if (ret == OMAP_CRYPTO_BAD_DATA_LENGTH) { | |
| 144 | ret = omap_crypto_copy_sg_lists(total, bs, sg, new_sg, flags); | |
| 145 | if (ret) | |
| 146 | return ret; | |
| 147 | if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY)) | |
| 148 | *dd_flags |= OMAP_CRYPTO_SG_COPIED << flags_shift; | |
| 149 | } else if (flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY) { | |
| 150 | sg_set_buf(new_sg, sg_virt(*sg), (*sg)->length); | |
| 151 | } | |
| 152 | ||
| 153 | return 0; | |
| 154 | } | |
| 155 | EXPORT_SYMBOL_GPL(omap_crypto_align_sg); | |
| 156 | ||
| 157 | void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig, | |
| 158 | int offset, int len, u8 flags_shift, | |
| 159 | unsigned long flags) | |
| 160 | { | |
| 161 | void *buf; | |
| 162 | int pages; | |
| 163 | ||
| 164 | flags >>= flags_shift; | |
| 165 | flags &= OMAP_CRYPTO_COPY_MASK; | |
| 166 | ||
| 167 | if (!flags) | |
| 168 | return; | |
| 169 | ||
| 170 | buf = sg_virt(sg); | |
| 171 | pages = get_order(len); | |
| 172 | ||
| 173 | if (orig && (flags & OMAP_CRYPTO_COPY_MASK)) | |
| 174 | scatterwalk_map_and_copy(buf, orig, offset, len, 1); | |
| 175 | ||
| 176 | if (flags & OMAP_CRYPTO_DATA_COPIED) | |
| 177 | free_pages((unsigned long)buf, pages); | |
| 178 | else if (flags & OMAP_CRYPTO_SG_COPIED) | |
| 179 | kfree(sg); | |
| 180 | } | |
| 181 | EXPORT_SYMBOL_GPL(omap_crypto_cleanup); | |
| 182 | ||
| 183 | MODULE_DESCRIPTION("OMAP crypto support library."); | |
| 184 | MODULE_LICENSE("GPL v2"); | |
| 185 | MODULE_AUTHOR("Tero Kristo <t-kristo@ti.com>"); |