1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * sun8i-ce-cipher.c - hardware cryptographic offloader for 4 * Allwinner H3/A64/H5/H2+/H6/R40 SoC 5 * 6 * Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com> 7 * 8 * This file add support for AES cipher with 128,192,256 bits keysize in 9 * CBC and ECB mode. 10 * 11 * You could find a link for the datasheet in Documentation/arm/sunxi.rst 12 */ 13 14 #include <linux/crypto.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/io.h> 17 #include <linux/pm_runtime.h> 18 #include <crypto/scatterwalk.h> 19 #include <crypto/internal/des.h> 20 #include <crypto/internal/skcipher.h> 21 #include "sun8i-ce.h" 22 23 static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq) 24 { 25 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 26 struct scatterlist *sg; 27 28 if (sg_nents(areq->src) > MAX_SG || sg_nents(areq->dst) > MAX_SG) 29 return true; 30 31 if (areq->cryptlen < crypto_skcipher_ivsize(tfm)) 32 return true; 33 34 if (areq->cryptlen == 0 || areq->cryptlen % 16) 35 return true; 36 37 sg = areq->src; 38 while (sg) { 39 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32))) 40 return true; 41 sg = sg_next(sg); 42 } 43 sg = areq->dst; 44 while (sg) { 45 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32))) 46 return true; 47 sg = sg_next(sg); 48 } 49 return false; 50 } 51 52 static int sun8i_ce_cipher_fallback(struct skcipher_request *areq) 53 { 54 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 55 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 56 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); 57 int err; 58 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG 59 struct skcipher_alg *alg = crypto_skcipher_alg(tfm); 60 struct sun8i_ce_alg_template *algt; 61 #endif 62 SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, op->fallback_tfm); 63 64 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG 65 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher); 66 algt->stat_fb++; 67 #endif 68 69 skcipher_request_set_sync_tfm(subreq, op->fallback_tfm); 70 skcipher_request_set_callback(subreq, areq->base.flags, NULL, NULL); 71 skcipher_request_set_crypt(subreq, areq->src, areq->dst, 72 areq->cryptlen, areq->iv); 73 if (rctx->op_dir & CE_DECRYPTION) 74 err = crypto_skcipher_decrypt(subreq); 75 else 76 err = crypto_skcipher_encrypt(subreq); 77 skcipher_request_zero(subreq); 78 return err; 79 } 80 81 static int sun8i_ce_cipher(struct skcipher_request *areq) 82 { 83 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 84 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 85 struct sun8i_ce_dev *ce = op->ce; 86 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); 87 struct skcipher_alg *alg = crypto_skcipher_alg(tfm); 88 struct sun8i_ce_alg_template *algt; 89 struct sun8i_ce_flow *chan; 90 struct ce_task *cet; 91 struct scatterlist *sg; 92 unsigned int todo, len, offset, ivsize; 93 dma_addr_t addr_iv = 0, addr_key = 0; 94 void *backup_iv = NULL; 95 u32 common, sym; 96 int flow, i; 97 int nr_sgs = 0; 98 int nr_sgd = 0; 99 int err = 0; 100 101 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher); 102 103 dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__, 104 crypto_tfm_alg_name(areq->base.tfm), 105 areq->cryptlen, 106 rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm), 107 op->keylen); 108 109 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG 110 algt->stat_req++; 111 #endif 112 113 flow = rctx->flow; 114 115 chan = &ce->chanlist[flow]; 116 117 cet = chan->tl; 118 memset(cet, 0, sizeof(struct ce_task)); 119 120 cet->t_id = cpu_to_le32(flow); 121 common = ce->variant->alg_cipher[algt->ce_algo_id]; 122 common |= rctx->op_dir | CE_COMM_INT; 123 cet->t_common_ctl = cpu_to_le32(common); 124 /* CTS and recent CE (H6) need length in bytes, in word otherwise */ 125 if (ce->variant->has_t_dlen_in_bytes) 126 cet->t_dlen = cpu_to_le32(areq->cryptlen); 127 else 128 cet->t_dlen = cpu_to_le32(areq->cryptlen / 4); 129 130 sym = ce->variant->op_mode[algt->ce_blockmode]; 131 len = op->keylen; 132 switch (len) { 133 case 128 / 8: 134 sym |= CE_AES_128BITS; 135 break; 136 case 192 / 8: 137 sym |= CE_AES_192BITS; 138 break; 139 case 256 / 8: 140 sym |= CE_AES_256BITS; 141 break; 142 } 143 144 cet->t_sym_ctl = cpu_to_le32(sym); 145 cet->t_asym_ctl = 0; 146 147 addr_key = dma_map_single(ce->dev, op->key, op->keylen, DMA_TO_DEVICE); 148 cet->t_key = cpu_to_le32(addr_key); 149 if (dma_mapping_error(ce->dev, addr_key)) { 150 dev_err(ce->dev, "Cannot DMA MAP KEY\n"); 151 err = -EFAULT; 152 goto theend; 153 } 154 155 ivsize = crypto_skcipher_ivsize(tfm); 156 if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) { 157 chan->ivlen = ivsize; 158 chan->bounce_iv = kzalloc(ivsize, GFP_KERNEL | GFP_DMA); 159 if (!chan->bounce_iv) { 160 err = -ENOMEM; 161 goto theend_key; 162 } 163 if (rctx->op_dir & CE_DECRYPTION) { 164 backup_iv = kzalloc(ivsize, GFP_KERNEL); 165 if (!backup_iv) { 166 err = -ENOMEM; 167 goto theend_key; 168 } 169 offset = areq->cryptlen - ivsize; 170 scatterwalk_map_and_copy(backup_iv, areq->src, offset, 171 ivsize, 0); 172 } 173 memcpy(chan->bounce_iv, areq->iv, ivsize); 174 addr_iv = dma_map_single(ce->dev, chan->bounce_iv, chan->ivlen, 175 DMA_TO_DEVICE); 176 cet->t_iv = cpu_to_le32(addr_iv); 177 if (dma_mapping_error(ce->dev, addr_iv)) { 178 dev_err(ce->dev, "Cannot DMA MAP IV\n"); 179 err = -ENOMEM; 180 goto theend_iv; 181 } 182 } 183 184 if (areq->src == areq->dst) { 185 nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src), 186 DMA_BIDIRECTIONAL); 187 if (nr_sgs <= 0 || nr_sgs > MAX_SG) { 188 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs); 189 err = -EINVAL; 190 goto theend_iv; 191 } 192 nr_sgd = nr_sgs; 193 } else { 194 nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src), 195 DMA_TO_DEVICE); 196 if (nr_sgs <= 0 || nr_sgs > MAX_SG) { 197 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs); 198 err = -EINVAL; 199 goto theend_iv; 200 } 201 nr_sgd = dma_map_sg(ce->dev, areq->dst, sg_nents(areq->dst), 202 DMA_FROM_DEVICE); 203 if (nr_sgd <= 0 || nr_sgd > MAX_SG) { 204 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd); 205 err = -EINVAL; 206 goto theend_sgs; 207 } 208 } 209 210 len = areq->cryptlen; 211 for_each_sg(areq->src, sg, nr_sgs, i) { 212 cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg)); 213 todo = min(len, sg_dma_len(sg)); 214 cet->t_src[i].len = cpu_to_le32(todo / 4); 215 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__, 216 areq->cryptlen, i, cet->t_src[i].len, sg->offset, todo); 217 len -= todo; 218 } 219 if (len > 0) { 220 dev_err(ce->dev, "remaining len %d\n", len); 221 err = -EINVAL; 222 goto theend_sgs; 223 } 224 225 len = areq->cryptlen; 226 for_each_sg(areq->dst, sg, nr_sgd, i) { 227 cet->t_dst[i].addr = cpu_to_le32(sg_dma_address(sg)); 228 todo = min(len, sg_dma_len(sg)); 229 cet->t_dst[i].len = cpu_to_le32(todo / 4); 230 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__, 231 areq->cryptlen, i, cet->t_dst[i].len, sg->offset, todo); 232 len -= todo; 233 } 234 if (len > 0) { 235 dev_err(ce->dev, "remaining len %d\n", len); 236 err = -EINVAL; 237 goto theend_sgs; 238 } 239 240 chan->timeout = areq->cryptlen; 241 err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(areq->base.tfm)); 242 243 theend_sgs: 244 if (areq->src == areq->dst) { 245 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL); 246 } else { 247 if (nr_sgs > 0) 248 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE); 249 dma_unmap_sg(ce->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE); 250 } 251 252 theend_iv: 253 if (areq->iv && ivsize > 0) { 254 if (addr_iv) 255 dma_unmap_single(ce->dev, addr_iv, chan->ivlen, 256 DMA_TO_DEVICE); 257 offset = areq->cryptlen - ivsize; 258 if (rctx->op_dir & CE_DECRYPTION) { 259 memcpy(areq->iv, backup_iv, ivsize); 260 kzfree(backup_iv); 261 } else { 262 scatterwalk_map_and_copy(areq->iv, areq->dst, offset, 263 ivsize, 0); 264 } 265 kfree(chan->bounce_iv); 266 } 267 268 theend_key: 269 dma_unmap_single(ce->dev, addr_key, op->keylen, DMA_TO_DEVICE); 270 271 theend: 272 return err; 273 } 274 275 static int sun8i_ce_handle_cipher_request(struct crypto_engine *engine, void *areq) 276 { 277 int err; 278 struct skcipher_request *breq = container_of(areq, struct skcipher_request, base); 279 280 err = sun8i_ce_cipher(breq); 281 crypto_finalize_skcipher_request(engine, breq, err); 282 283 return 0; 284 } 285 286 int sun8i_ce_skdecrypt(struct skcipher_request *areq) 287 { 288 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 289 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 290 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); 291 struct crypto_engine *engine; 292 int e; 293 294 rctx->op_dir = CE_DECRYPTION; 295 if (sun8i_ce_cipher_need_fallback(areq)) 296 return sun8i_ce_cipher_fallback(areq); 297 298 e = sun8i_ce_get_engine_number(op->ce); 299 rctx->flow = e; 300 engine = op->ce->chanlist[e].engine; 301 302 return crypto_transfer_skcipher_request_to_engine(engine, areq); 303 } 304 305 int sun8i_ce_skencrypt(struct skcipher_request *areq) 306 { 307 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 308 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 309 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); 310 struct crypto_engine *engine; 311 int e; 312 313 rctx->op_dir = CE_ENCRYPTION; 314 if (sun8i_ce_cipher_need_fallback(areq)) 315 return sun8i_ce_cipher_fallback(areq); 316 317 e = sun8i_ce_get_engine_number(op->ce); 318 rctx->flow = e; 319 engine = op->ce->chanlist[e].engine; 320 321 return crypto_transfer_skcipher_request_to_engine(engine, areq); 322 } 323 324 int sun8i_ce_cipher_init(struct crypto_tfm *tfm) 325 { 326 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); 327 struct sun8i_ce_alg_template *algt; 328 const char *name = crypto_tfm_alg_name(tfm); 329 struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm); 330 struct skcipher_alg *alg = crypto_skcipher_alg(sktfm); 331 int err; 332 333 memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx)); 334 335 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher); 336 op->ce = algt->ce; 337 338 sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx); 339 340 op->fallback_tfm = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK); 341 if (IS_ERR(op->fallback_tfm)) { 342 dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n", 343 name, PTR_ERR(op->fallback_tfm)); 344 return PTR_ERR(op->fallback_tfm); 345 } 346 347 dev_info(op->ce->dev, "Fallback for %s is %s\n", 348 crypto_tfm_alg_driver_name(&sktfm->base), 349 crypto_tfm_alg_driver_name(crypto_skcipher_tfm(&op->fallback_tfm->base))); 350 351 op->enginectx.op.do_one_request = sun8i_ce_handle_cipher_request; 352 op->enginectx.op.prepare_request = NULL; 353 op->enginectx.op.unprepare_request = NULL; 354 355 err = pm_runtime_get_sync(op->ce->dev); 356 if (err < 0) 357 goto error_pm; 358 359 return 0; 360 error_pm: 361 crypto_free_sync_skcipher(op->fallback_tfm); 362 return err; 363 } 364 365 void sun8i_ce_cipher_exit(struct crypto_tfm *tfm) 366 { 367 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); 368 369 if (op->key) { 370 memzero_explicit(op->key, op->keylen); 371 kfree(op->key); 372 } 373 crypto_free_sync_skcipher(op->fallback_tfm); 374 pm_runtime_put_sync_suspend(op->ce->dev); 375 } 376 377 int sun8i_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, 378 unsigned int keylen) 379 { 380 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 381 struct sun8i_ce_dev *ce = op->ce; 382 383 switch (keylen) { 384 case 128 / 8: 385 break; 386 case 192 / 8: 387 break; 388 case 256 / 8: 389 break; 390 default: 391 dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen); 392 return -EINVAL; 393 } 394 if (op->key) { 395 memzero_explicit(op->key, op->keylen); 396 kfree(op->key); 397 } 398 op->keylen = keylen; 399 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); 400 if (!op->key) 401 return -ENOMEM; 402 403 crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK); 404 crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); 405 406 return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen); 407 } 408 409 int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key, 410 unsigned int keylen) 411 { 412 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 413 int err; 414 415 err = verify_skcipher_des3_key(tfm, key); 416 if (err) 417 return err; 418 419 if (op->key) { 420 memzero_explicit(op->key, op->keylen); 421 kfree(op->key); 422 } 423 op->keylen = keylen; 424 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); 425 if (!op->key) 426 return -ENOMEM; 427 428 crypto_sync_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK); 429 crypto_sync_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); 430 431 return crypto_sync_skcipher_setkey(op->fallback_tfm, key, keylen); 432 } 433