1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2019 Google LLC 4 */ 5 6 #include <ufs/ufshcd.h> 7 #include "ufshcd-crypto.h" 8 9 /* Blk-crypto modes supported by UFS crypto */ 10 static const struct ufs_crypto_alg_entry { 11 enum ufs_crypto_alg ufs_alg; 12 enum ufs_crypto_key_size ufs_key_size; 13 } ufs_crypto_algs[BLK_ENCRYPTION_MODE_MAX] = { 14 [BLK_ENCRYPTION_MODE_AES_256_XTS] = { 15 .ufs_alg = UFS_CRYPTO_ALG_AES_XTS, 16 .ufs_key_size = UFS_CRYPTO_KEY_SIZE_256, 17 }, 18 }; 19 20 static int ufshcd_program_key(struct ufs_hba *hba, 21 const union ufs_crypto_cfg_entry *cfg, int slot) 22 { 23 int i; 24 u32 slot_offset = hba->crypto_cfg_register + slot * sizeof(*cfg); 25 int err = 0; 26 27 ufshcd_hold(hba, false); 28 29 if (hba->vops && hba->vops->program_key) { 30 err = hba->vops->program_key(hba, cfg, slot); 31 goto out; 32 } 33 34 /* Ensure that CFGE is cleared before programming the key */ 35 ufshcd_writel(hba, 0, slot_offset + 16 * sizeof(cfg->reg_val[0])); 36 for (i = 0; i < 16; i++) { 37 ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[i]), 38 slot_offset + i * sizeof(cfg->reg_val[0])); 39 } 40 /* Write dword 17 */ 41 ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[17]), 42 slot_offset + 17 * sizeof(cfg->reg_val[0])); 43 /* Dword 16 must be written last */ 44 ufshcd_writel(hba, le32_to_cpu(cfg->reg_val[16]), 45 slot_offset + 16 * sizeof(cfg->reg_val[0])); 46 out: 47 ufshcd_release(hba); 48 return err; 49 } 50 51 static int ufshcd_crypto_keyslot_program(struct blk_crypto_profile *profile, 52 const struct blk_crypto_key *key, 53 unsigned int slot) 54 { 55 struct ufs_hba *hba = 56 container_of(profile, struct ufs_hba, crypto_profile); 57 const union ufs_crypto_cap_entry *ccap_array = hba->crypto_cap_array; 58 const struct ufs_crypto_alg_entry *alg = 59 &ufs_crypto_algs[key->crypto_cfg.crypto_mode]; 60 u8 data_unit_mask = key->crypto_cfg.data_unit_size / 512; 61 int i; 62 int cap_idx = -1; 63 union ufs_crypto_cfg_entry cfg = {}; 64 int err; 65 66 BUILD_BUG_ON(UFS_CRYPTO_KEY_SIZE_INVALID != 0); 67 for (i = 0; i < hba->crypto_capabilities.num_crypto_cap; i++) { 68 if (ccap_array[i].algorithm_id == alg->ufs_alg && 69 ccap_array[i].key_size == alg->ufs_key_size && 70 (ccap_array[i].sdus_mask & data_unit_mask)) { 71 cap_idx = i; 72 break; 73 } 74 } 75 76 if (WARN_ON(cap_idx < 0)) 77 return -EOPNOTSUPP; 78 79 cfg.data_unit_size = data_unit_mask; 80 cfg.crypto_cap_idx = cap_idx; 81 cfg.config_enable = UFS_CRYPTO_CONFIGURATION_ENABLE; 82 83 if (ccap_array[cap_idx].algorithm_id == UFS_CRYPTO_ALG_AES_XTS) { 84 /* In XTS mode, the blk_crypto_key's size is already doubled */ 85 memcpy(cfg.crypto_key, key->raw, key->size/2); 86 memcpy(cfg.crypto_key + UFS_CRYPTO_KEY_MAX_SIZE/2, 87 key->raw + key->size/2, key->size/2); 88 } else { 89 memcpy(cfg.crypto_key, key->raw, key->size); 90 } 91 92 err = ufshcd_program_key(hba, &cfg, slot); 93 94 memzero_explicit(&cfg, sizeof(cfg)); 95 return err; 96 } 97 98 static int ufshcd_clear_keyslot(struct ufs_hba *hba, int slot) 99 { 100 /* 101 * Clear the crypto cfg on the device. Clearing CFGE 102 * might not be sufficient, so just clear the entire cfg. 103 */ 104 union ufs_crypto_cfg_entry cfg = {}; 105 106 return ufshcd_program_key(hba, &cfg, slot); 107 } 108 109 static int ufshcd_crypto_keyslot_evict(struct blk_crypto_profile *profile, 110 const struct blk_crypto_key *key, 111 unsigned int slot) 112 { 113 struct ufs_hba *hba = 114 container_of(profile, struct ufs_hba, crypto_profile); 115 116 return ufshcd_clear_keyslot(hba, slot); 117 } 118 119 bool ufshcd_crypto_enable(struct ufs_hba *hba) 120 { 121 if (!(hba->caps & UFSHCD_CAP_CRYPTO)) 122 return false; 123 124 /* Reset might clear all keys, so reprogram all the keys. */ 125 blk_crypto_reprogram_all_keys(&hba->crypto_profile); 126 return true; 127 } 128 129 static const struct blk_crypto_ll_ops ufshcd_crypto_ops = { 130 .keyslot_program = ufshcd_crypto_keyslot_program, 131 .keyslot_evict = ufshcd_crypto_keyslot_evict, 132 }; 133 134 static enum blk_crypto_mode_num 135 ufshcd_find_blk_crypto_mode(union ufs_crypto_cap_entry cap) 136 { 137 int i; 138 139 for (i = 0; i < ARRAY_SIZE(ufs_crypto_algs); i++) { 140 BUILD_BUG_ON(UFS_CRYPTO_KEY_SIZE_INVALID != 0); 141 if (ufs_crypto_algs[i].ufs_alg == cap.algorithm_id && 142 ufs_crypto_algs[i].ufs_key_size == cap.key_size) { 143 return i; 144 } 145 } 146 return BLK_ENCRYPTION_MODE_INVALID; 147 } 148 149 /** 150 * ufshcd_hba_init_crypto_capabilities - Read crypto capabilities, init crypto 151 * fields in hba 152 * @hba: Per adapter instance 153 * 154 * Return: 0 if crypto was initialized or is not supported, else a -errno value. 155 */ 156 int ufshcd_hba_init_crypto_capabilities(struct ufs_hba *hba) 157 { 158 int cap_idx; 159 int err = 0; 160 enum blk_crypto_mode_num blk_mode_num; 161 162 /* 163 * Don't use crypto if either the hardware doesn't advertise the 164 * standard crypto capability bit *or* if the vendor specific driver 165 * hasn't advertised that crypto is supported. 166 */ 167 if (!(hba->capabilities & MASK_CRYPTO_SUPPORT) || 168 !(hba->caps & UFSHCD_CAP_CRYPTO)) 169 goto out; 170 171 hba->crypto_capabilities.reg_val = 172 cpu_to_le32(ufshcd_readl(hba, REG_UFS_CCAP)); 173 hba->crypto_cfg_register = 174 (u32)hba->crypto_capabilities.config_array_ptr * 0x100; 175 hba->crypto_cap_array = 176 devm_kcalloc(hba->dev, hba->crypto_capabilities.num_crypto_cap, 177 sizeof(hba->crypto_cap_array[0]), GFP_KERNEL); 178 if (!hba->crypto_cap_array) { 179 err = -ENOMEM; 180 goto out; 181 } 182 183 /* The actual number of configurations supported is (CFGC+1) */ 184 err = devm_blk_crypto_profile_init( 185 hba->dev, &hba->crypto_profile, 186 hba->crypto_capabilities.config_count + 1); 187 if (err) 188 goto out; 189 190 hba->crypto_profile.ll_ops = ufshcd_crypto_ops; 191 /* UFS only supports 8 bytes for any DUN */ 192 hba->crypto_profile.max_dun_bytes_supported = 8; 193 hba->crypto_profile.dev = hba->dev; 194 195 /* 196 * Cache all the UFS crypto capabilities and advertise the supported 197 * crypto modes and data unit sizes to the block layer. 198 */ 199 for (cap_idx = 0; cap_idx < hba->crypto_capabilities.num_crypto_cap; 200 cap_idx++) { 201 hba->crypto_cap_array[cap_idx].reg_val = 202 cpu_to_le32(ufshcd_readl(hba, 203 REG_UFS_CRYPTOCAP + 204 cap_idx * sizeof(__le32))); 205 blk_mode_num = ufshcd_find_blk_crypto_mode( 206 hba->crypto_cap_array[cap_idx]); 207 if (blk_mode_num != BLK_ENCRYPTION_MODE_INVALID) 208 hba->crypto_profile.modes_supported[blk_mode_num] |= 209 hba->crypto_cap_array[cap_idx].sdus_mask * 512; 210 } 211 212 return 0; 213 214 out: 215 /* Indicate that init failed by clearing UFSHCD_CAP_CRYPTO */ 216 hba->caps &= ~UFSHCD_CAP_CRYPTO; 217 return err; 218 } 219 220 /** 221 * ufshcd_init_crypto - Initialize crypto hardware 222 * @hba: Per adapter instance 223 */ 224 void ufshcd_init_crypto(struct ufs_hba *hba) 225 { 226 int slot; 227 228 if (!(hba->caps & UFSHCD_CAP_CRYPTO)) 229 return; 230 231 /* Clear all keyslots - the number of keyslots is (CFGC + 1) */ 232 for (slot = 0; slot < hba->crypto_capabilities.config_count + 1; slot++) 233 ufshcd_clear_keyslot(hba, slot); 234 } 235 236 void ufshcd_crypto_register(struct ufs_hba *hba, struct request_queue *q) 237 { 238 if (hba->caps & UFSHCD_CAP_CRYPTO) 239 blk_crypto_register(&hba->crypto_profile, q); 240 } 241