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/bottom_half.h> 15#include <linux/crypto.h> 16#include <linux/dma-mapping.h> 17#include <linux/io.h> 18#include <linux/pm_runtime.h> 19#include <crypto/scatterwalk.h> 20#include <crypto/internal/des.h> 21#include <crypto/internal/skcipher.h> 22#include "sun8i-ce.h" 23 24static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq) 25{ 26 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 27 struct scatterlist *sg; 28 29 if (sg_nents(areq->src) > MAX_SG || sg_nents(areq->dst) > MAX_SG) 30 return true; 31 32 if (areq->cryptlen < crypto_skcipher_ivsize(tfm)) 33 return true; 34 35 if (areq->cryptlen == 0 || areq->cryptlen % 16) 36 return true; 37 38 sg = areq->src; 39 while (sg) { 40 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32))) 41 return true; 42 sg = sg_next(sg); 43 } 44 sg = areq->dst; 45 while (sg) { 46 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32))) 47 return true; 48 sg = sg_next(sg); 49 } 50 return false; 51} 52 53static int sun8i_ce_cipher_fallback(struct skcipher_request *areq) 54{ 55 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 56 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 57 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); 58 int err; 59#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG 60 struct skcipher_alg *alg = crypto_skcipher_alg(tfm); 61 struct sun8i_ce_alg_template *algt; 62 63 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher); 64 algt->stat_fb++; 65#endif 66 67 skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm); 68 skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags, 69 areq->base.complete, areq->base.data); 70 skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst, 71 areq->cryptlen, areq->iv); 72 if (rctx->op_dir & CE_DECRYPTION) 73 err = crypto_skcipher_decrypt(&rctx->fallback_req); 74 else 75 err = crypto_skcipher_encrypt(&rctx->fallback_req); 76 return err; 77} 78 79static int sun8i_ce_cipher_prepare(struct crypto_engine *engine, void *async_req) 80{ 81 struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base); 82 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 83 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 84 struct sun8i_ce_dev *ce = op->ce; 85 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); 86 struct skcipher_alg *alg = crypto_skcipher_alg(tfm); 87 struct sun8i_ce_alg_template *algt; 88 struct sun8i_ce_flow *chan; 89 struct ce_task *cet; 90 struct scatterlist *sg; 91 unsigned int todo, len, offset, ivsize; 92 u32 common, sym; 93 int flow, i; 94 int nr_sgs = 0; 95 int nr_sgd = 0; 96 int err = 0; 97 98 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher); 99 100 dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__, 101 crypto_tfm_alg_name(areq->base.tfm), 102 areq->cryptlen, 103 rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm), 104 op->keylen); 105 106#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG 107 algt->stat_req++; 108#endif 109 110 flow = rctx->flow; 111 112 chan = &ce->chanlist[flow]; 113 114 cet = chan->tl; 115 memset(cet, 0, sizeof(struct ce_task)); 116 117 cet->t_id = cpu_to_le32(flow); 118 common = ce->variant->alg_cipher[algt->ce_algo_id]; 119 common |= rctx->op_dir | CE_COMM_INT; 120 cet->t_common_ctl = cpu_to_le32(common); 121 /* CTS and recent CE (H6) need length in bytes, in word otherwise */ 122 if (ce->variant->cipher_t_dlen_in_bytes) 123 cet->t_dlen = cpu_to_le32(areq->cryptlen); 124 else 125 cet->t_dlen = cpu_to_le32(areq->cryptlen / 4); 126 127 sym = ce->variant->op_mode[algt->ce_blockmode]; 128 len = op->keylen; 129 switch (len) { 130 case 128 / 8: 131 sym |= CE_AES_128BITS; 132 break; 133 case 192 / 8: 134 sym |= CE_AES_192BITS; 135 break; 136 case 256 / 8: 137 sym |= CE_AES_256BITS; 138 break; 139 } 140 141 cet->t_sym_ctl = cpu_to_le32(sym); 142 cet->t_asym_ctl = 0; 143 144 rctx->addr_key = dma_map_single(ce->dev, op->key, op->keylen, DMA_TO_DEVICE); 145 if (dma_mapping_error(ce->dev, rctx->addr_key)) { 146 dev_err(ce->dev, "Cannot DMA MAP KEY\n"); 147 err = -EFAULT; 148 goto theend; 149 } 150 cet->t_key = cpu_to_le32(rctx->addr_key); 151 152 ivsize = crypto_skcipher_ivsize(tfm); 153 if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) { 154 rctx->ivlen = ivsize; 155 rctx->bounce_iv = kzalloc(ivsize, GFP_KERNEL | GFP_DMA); 156 if (!rctx->bounce_iv) { 157 err = -ENOMEM; 158 goto theend_key; 159 } 160 if (rctx->op_dir & CE_DECRYPTION) { 161 rctx->backup_iv = kzalloc(ivsize, GFP_KERNEL); 162 if (!rctx->backup_iv) { 163 err = -ENOMEM; 164 goto theend_key; 165 } 166 offset = areq->cryptlen - ivsize; 167 scatterwalk_map_and_copy(rctx->backup_iv, areq->src, 168 offset, ivsize, 0); 169 } 170 memcpy(rctx->bounce_iv, areq->iv, ivsize); 171 rctx->addr_iv = dma_map_single(ce->dev, rctx->bounce_iv, rctx->ivlen, 172 DMA_TO_DEVICE); 173 if (dma_mapping_error(ce->dev, rctx->addr_iv)) { 174 dev_err(ce->dev, "Cannot DMA MAP IV\n"); 175 err = -ENOMEM; 176 goto theend_iv; 177 } 178 cet->t_iv = cpu_to_le32(rctx->addr_iv); 179 } 180 181 if (areq->src == areq->dst) { 182 nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src), 183 DMA_BIDIRECTIONAL); 184 if (nr_sgs <= 0 || nr_sgs > MAX_SG) { 185 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs); 186 err = -EINVAL; 187 goto theend_iv; 188 } 189 nr_sgd = nr_sgs; 190 } else { 191 nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src), 192 DMA_TO_DEVICE); 193 if (nr_sgs <= 0 || nr_sgs > MAX_SG) { 194 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs); 195 err = -EINVAL; 196 goto theend_iv; 197 } 198 nr_sgd = dma_map_sg(ce->dev, areq->dst, sg_nents(areq->dst), 199 DMA_FROM_DEVICE); 200 if (nr_sgd <= 0 || nr_sgd > MAX_SG) { 201 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd); 202 err = -EINVAL; 203 goto theend_sgs; 204 } 205 } 206 207 len = areq->cryptlen; 208 for_each_sg(areq->src, sg, nr_sgs, i) { 209 cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg)); 210 todo = min(len, sg_dma_len(sg)); 211 cet->t_src[i].len = cpu_to_le32(todo / 4); 212 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__, 213 areq->cryptlen, i, cet->t_src[i].len, sg->offset, todo); 214 len -= todo; 215 } 216 if (len > 0) { 217 dev_err(ce->dev, "remaining len %d\n", len); 218 err = -EINVAL; 219 goto theend_sgs; 220 } 221 222 len = areq->cryptlen; 223 for_each_sg(areq->dst, sg, nr_sgd, i) { 224 cet->t_dst[i].addr = cpu_to_le32(sg_dma_address(sg)); 225 todo = min(len, sg_dma_len(sg)); 226 cet->t_dst[i].len = cpu_to_le32(todo / 4); 227 dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__, 228 areq->cryptlen, i, cet->t_dst[i].len, sg->offset, todo); 229 len -= todo; 230 } 231 if (len > 0) { 232 dev_err(ce->dev, "remaining len %d\n", len); 233 err = -EINVAL; 234 goto theend_sgs; 235 } 236 237 chan->timeout = areq->cryptlen; 238 rctx->nr_sgs = nr_sgs; 239 rctx->nr_sgd = nr_sgd; 240 return 0; 241 242theend_sgs: 243 if (areq->src == areq->dst) { 244 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL); 245 } else { 246 if (nr_sgs > 0) 247 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE); 248 dma_unmap_sg(ce->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE); 249 } 250 251theend_iv: 252 if (areq->iv && ivsize > 0) { 253 if (rctx->addr_iv) 254 dma_unmap_single(ce->dev, rctx->addr_iv, rctx->ivlen, DMA_TO_DEVICE); 255 offset = areq->cryptlen - ivsize; 256 if (rctx->op_dir & CE_DECRYPTION) { 257 memcpy(areq->iv, rctx->backup_iv, ivsize); 258 kfree_sensitive(rctx->backup_iv); 259 } else { 260 scatterwalk_map_and_copy(areq->iv, areq->dst, offset, 261 ivsize, 0); 262 } 263 kfree(rctx->bounce_iv); 264 } 265 266theend_key: 267 dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE); 268 269theend: 270 return err; 271} 272 273static int sun8i_ce_cipher_run(struct crypto_engine *engine, void *areq) 274{ 275 struct skcipher_request *breq = container_of(areq, struct skcipher_request, base); 276 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(breq); 277 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 278 struct sun8i_ce_dev *ce = op->ce; 279 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(breq); 280 int flow, err; 281 282 flow = rctx->flow; 283 err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(breq->base.tfm)); 284 local_bh_disable(); 285 crypto_finalize_skcipher_request(engine, breq, err); 286 local_bh_enable(); 287 return 0; 288} 289 290static int sun8i_ce_cipher_unprepare(struct crypto_engine *engine, void *async_req) 291{ 292 struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base); 293 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 294 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 295 struct sun8i_ce_dev *ce = op->ce; 296 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); 297 struct sun8i_ce_flow *chan; 298 struct ce_task *cet; 299 unsigned int ivsize, offset; 300 int nr_sgs = rctx->nr_sgs; 301 int nr_sgd = rctx->nr_sgd; 302 int flow; 303 304 flow = rctx->flow; 305 chan = &ce->chanlist[flow]; 306 cet = chan->tl; 307 ivsize = crypto_skcipher_ivsize(tfm); 308 309 if (areq->src == areq->dst) { 310 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL); 311 } else { 312 if (nr_sgs > 0) 313 dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE); 314 dma_unmap_sg(ce->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE); 315 } 316 317 if (areq->iv && ivsize > 0) { 318 if (cet->t_iv) 319 dma_unmap_single(ce->dev, rctx->addr_iv, rctx->ivlen, DMA_TO_DEVICE); 320 offset = areq->cryptlen - ivsize; 321 if (rctx->op_dir & CE_DECRYPTION) { 322 memcpy(areq->iv, rctx->backup_iv, ivsize); 323 kfree_sensitive(rctx->backup_iv); 324 } else { 325 scatterwalk_map_and_copy(areq->iv, areq->dst, offset, 326 ivsize, 0); 327 } 328 kfree(rctx->bounce_iv); 329 } 330 331 dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE); 332 333 return 0; 334} 335 336int sun8i_ce_skdecrypt(struct skcipher_request *areq) 337{ 338 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 339 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 340 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); 341 struct crypto_engine *engine; 342 int e; 343 344 rctx->op_dir = CE_DECRYPTION; 345 if (sun8i_ce_cipher_need_fallback(areq)) 346 return sun8i_ce_cipher_fallback(areq); 347 348 e = sun8i_ce_get_engine_number(op->ce); 349 rctx->flow = e; 350 engine = op->ce->chanlist[e].engine; 351 352 return crypto_transfer_skcipher_request_to_engine(engine, areq); 353} 354 355int sun8i_ce_skencrypt(struct skcipher_request *areq) 356{ 357 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq); 358 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 359 struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); 360 struct crypto_engine *engine; 361 int e; 362 363 rctx->op_dir = CE_ENCRYPTION; 364 if (sun8i_ce_cipher_need_fallback(areq)) 365 return sun8i_ce_cipher_fallback(areq); 366 367 e = sun8i_ce_get_engine_number(op->ce); 368 rctx->flow = e; 369 engine = op->ce->chanlist[e].engine; 370 371 return crypto_transfer_skcipher_request_to_engine(engine, areq); 372} 373 374int sun8i_ce_cipher_init(struct crypto_tfm *tfm) 375{ 376 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); 377 struct sun8i_ce_alg_template *algt; 378 const char *name = crypto_tfm_alg_name(tfm); 379 struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm); 380 struct skcipher_alg *alg = crypto_skcipher_alg(sktfm); 381 int err; 382 383 memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx)); 384 385 algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher); 386 op->ce = algt->ce; 387 388 op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK); 389 if (IS_ERR(op->fallback_tfm)) { 390 dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n", 391 name, PTR_ERR(op->fallback_tfm)); 392 return PTR_ERR(op->fallback_tfm); 393 } 394 395 sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) + 396 crypto_skcipher_reqsize(op->fallback_tfm); 397 398 399 dev_info(op->ce->dev, "Fallback for %s is %s\n", 400 crypto_tfm_alg_driver_name(&sktfm->base), 401 crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm))); 402 403 op->enginectx.op.do_one_request = sun8i_ce_cipher_run; 404 op->enginectx.op.prepare_request = sun8i_ce_cipher_prepare; 405 op->enginectx.op.unprepare_request = sun8i_ce_cipher_unprepare; 406 407 err = pm_runtime_get_sync(op->ce->dev); 408 if (err < 0) 409 goto error_pm; 410 411 return 0; 412error_pm: 413 pm_runtime_put_noidle(op->ce->dev); 414 crypto_free_skcipher(op->fallback_tfm); 415 return err; 416} 417 418void sun8i_ce_cipher_exit(struct crypto_tfm *tfm) 419{ 420 struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); 421 422 kfree_sensitive(op->key); 423 crypto_free_skcipher(op->fallback_tfm); 424 pm_runtime_put_sync_suspend(op->ce->dev); 425} 426 427int sun8i_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, 428 unsigned int keylen) 429{ 430 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 431 struct sun8i_ce_dev *ce = op->ce; 432 433 switch (keylen) { 434 case 128 / 8: 435 break; 436 case 192 / 8: 437 break; 438 case 256 / 8: 439 break; 440 default: 441 dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen); 442 return -EINVAL; 443 } 444 kfree_sensitive(op->key); 445 op->keylen = keylen; 446 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); 447 if (!op->key) 448 return -ENOMEM; 449 450 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK); 451 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); 452 453 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen); 454} 455 456int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key, 457 unsigned int keylen) 458{ 459 struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); 460 int err; 461 462 err = verify_skcipher_des3_key(tfm, key); 463 if (err) 464 return err; 465 466 kfree_sensitive(op->key); 467 op->keylen = keylen; 468 op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); 469 if (!op->key) 470 return -ENOMEM; 471 472 crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK); 473 crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); 474 475 return crypto_skcipher_setkey(op->fallback_tfm, key, keylen); 476} 477