drivers/crypto/caam/caampkc.c

   1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
   2 /*
   3  * caam - Freescale FSL CAAM support for Public Key Cryptography
   4  *
   5  * Copyright 2016 Freescale Semiconductor, Inc.
   6  * Copyright 2018-2019 NXP
   7  *
   8  * There is no Shared Descriptor for PKC so that the Job Descriptor must carry
   9  * all the desired key parameters, input and output pointers.
  10  */
  11 #include "compat.h"
  12 #include "regs.h"
  13 #include "intern.h"
  14 #include "jr.h"
  15 #include "error.h"
  16 #include "desc_constr.h"
  17 #include "sg_sw_sec4.h"
  18 #include "caampkc.h"
  19
  20 #define DESC_RSA_PUB_LEN        (2 * CAAM_CMD_SZ + SIZEOF_RSA_PUB_PDB)
  21 #define DESC_RSA_PRIV_F1_LEN    (2 * CAAM_CMD_SZ + \
  22                                  SIZEOF_RSA_PRIV_F1_PDB)
  23 #define DESC_RSA_PRIV_F2_LEN    (2 * CAAM_CMD_SZ + \
  24                                  SIZEOF_RSA_PRIV_F2_PDB)
  25 #define DESC_RSA_PRIV_F3_LEN    (2 * CAAM_CMD_SZ + \
  26                                  SIZEOF_RSA_PRIV_F3_PDB)
  27 #define CAAM_RSA_MAX_INPUT_SIZE 512 /* for a 4096-bit modulus */
  28
  29 /* buffer filled with zeros, used for padding */
  30 static u8 *zero_buffer;
  31
  32 /*
  33  * variable used to avoid double free of resources in case
  34  * algorithm registration was unsuccessful
  35  */
  36 static bool init_done;
  37
  38 struct caam_akcipher_alg {
  39         struct akcipher_alg akcipher;
  40         bool registered;
  41 };
  42
  43 static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc,
  44                          struct akcipher_request *req)
  45 {
  46         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
  47
  48         dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
  49         dma_unmap_sg(dev, req_ctx->fixup_src, edesc->src_nents, DMA_TO_DEVICE);
  50
  51         if (edesc->sec4_sg_bytes)
  52                 dma_unmap_single(dev, edesc->sec4_sg_dma, edesc->sec4_sg_bytes,
  53                                  DMA_TO_DEVICE);
  54 }
  55
  56 static void rsa_pub_unmap(struct device *dev, struct rsa_edesc *edesc,
  57                           struct akcipher_request *req)
  58 {
  59         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  60         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
  61         struct caam_rsa_key *key = &ctx->key;
  62         struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
  63
  64         dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
  65         dma_unmap_single(dev, pdb->e_dma, key->e_sz, DMA_TO_DEVICE);
  66 }
  67
  68 static void rsa_priv_f1_unmap(struct device *dev, struct rsa_edesc *edesc,
  69                               struct akcipher_request *req)
  70 {
  71         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  72         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
  73         struct caam_rsa_key *key = &ctx->key;
  74         struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
  75
  76         dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
  77         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
  78 }
  79
  80 static void rsa_priv_f2_unmap(struct device *dev, struct rsa_edesc *edesc,
  81                               struct akcipher_request *req)
  82 {
  83         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  84         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
  85         struct caam_rsa_key *key = &ctx->key;
  86         struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
  87         size_t p_sz = key->p_sz;
  88         size_t q_sz = key->q_sz;
  89
  90         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
  91         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
  92         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
  93         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
  94         dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
  95 }
  96
  97 static void rsa_priv_f3_unmap(struct device *dev, struct rsa_edesc *edesc,
  98                               struct akcipher_request *req)
  99 {
 100         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 101         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 102         struct caam_rsa_key *key = &ctx->key;
 103         struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
 104         size_t p_sz = key->p_sz;
 105         size_t q_sz = key->q_sz;
 106
 107         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 108         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 109         dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
 110         dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
 111         dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
 112         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 113         dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
 114 }
 115
 116 /* RSA Job Completion handler */
 117 static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
 118 {
 119         struct akcipher_request *req = context;
 120         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 121         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 122         struct rsa_edesc *edesc;
 123         int ecode = 0;
 124         bool has_bklog;
 125
 126         if (err)
 127                 ecode = caam_jr_strstatus(dev, err);
 128
 129         edesc = req_ctx->edesc;
 130         has_bklog = edesc->bklog;
 131
 132         rsa_pub_unmap(dev, edesc, req);
 133         rsa_io_unmap(dev, edesc, req);
 134         kfree(edesc);
 135
 136         /*
 137          * If no backlog flag, the completion of the request is done
 138          * by CAAM, not crypto engine.
 139          */
 140         if (!has_bklog)
 141                 akcipher_request_complete(req, ecode);
 142         else
 143                 crypto_finalize_akcipher_request(jrp->engine, req, ecode);
 144 }
 145
 146 static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
 147                             void *context)
 148 {
 149         struct akcipher_request *req = context;
 150         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 151         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 152         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 153         struct caam_rsa_key *key = &ctx->key;
 154         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 155         struct rsa_edesc *edesc;
 156         int ecode = 0;
 157         bool has_bklog;
 158
 159         if (err)
 160                 ecode = caam_jr_strstatus(dev, err);
 161
 162         edesc = req_ctx->edesc;
 163         has_bklog = edesc->bklog;
 164
 165         switch (key->priv_form) {
 166         case FORM1:
 167                 rsa_priv_f1_unmap(dev, edesc, req);
 168                 break;
 169         case FORM2:
 170                 rsa_priv_f2_unmap(dev, edesc, req);
 171                 break;
 172         case FORM3:
 173                 rsa_priv_f3_unmap(dev, edesc, req);
 174         }
 175
 176         rsa_io_unmap(dev, edesc, req);
 177         kfree(edesc);
 178
 179         /*
 180          * If no backlog flag, the completion of the request is done
 181          * by CAAM, not crypto engine.
 182          */
 183         if (!has_bklog)
 184                 akcipher_request_complete(req, ecode);
 185         else
 186                 crypto_finalize_akcipher_request(jrp->engine, req, ecode);
 187 }
 188
 189 /**
 190  * Count leading zeros, need it to strip, from a given scatterlist
 191  *
 192  * @sgl   : scatterlist to count zeros from
 193  * @nbytes: number of zeros, in bytes, to strip
 194  * @flags : operation flags
 195  */
 196 static int caam_rsa_count_leading_zeros(struct scatterlist *sgl,
 197                                         unsigned int nbytes,
 198                                         unsigned int flags)
 199 {
 200         struct sg_mapping_iter miter;
 201         int lzeros, ents;
 202         unsigned int len;
 203         unsigned int tbytes = nbytes;
 204         const u8 *buff;
 205
 206         ents = sg_nents_for_len(sgl, nbytes);
 207         if (ents < 0)
 208                 return ents;
 209
 210         sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags);
 211
 212         lzeros = 0;
 213         len = 0;
 214         while (nbytes > 0) {
 215                 /* do not strip more than given bytes */
 216                 while (len && !*buff && lzeros < nbytes) {
 217                         lzeros++;
 218                         len--;
 219                         buff++;
 220                 }
 221
 222                 if (len && *buff)
 223                         break;
 224
 225                 sg_miter_next(&miter);
 226                 buff = miter.addr;
 227                 len = miter.length;
 228
 229                 nbytes -= lzeros;
 230                 lzeros = 0;
 231         }
 232
 233         miter.consumed = lzeros;
 234         sg_miter_stop(&miter);
 235         nbytes -= lzeros;
 236
 237         return tbytes - nbytes;
 238 }
 239
 240 static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
 241                                          size_t desclen)
 242 {
 243         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 244         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 245         struct device *dev = ctx->dev;
 246         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 247         struct caam_rsa_key *key = &ctx->key;
 248         struct rsa_edesc *edesc;
 249         gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
 250                        GFP_KERNEL : GFP_ATOMIC;
 251         int sg_flags = (flags == GFP_ATOMIC) ? SG_MITER_ATOMIC : 0;
 252         int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
 253         int src_nents, dst_nents;
 254         int mapped_src_nents, mapped_dst_nents;
 255         unsigned int diff_size = 0;
 256         int lzeros;
 257
 258         if (req->src_len > key->n_sz) {
 259                 /*
 260                  * strip leading zeros and
 261                  * return the number of zeros to skip
 262                  */
 263                 lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len -
 264                                                       key->n_sz, sg_flags);
 265                 if (lzeros < 0)
 266                         return ERR_PTR(lzeros);
 267
 268                 req_ctx->fixup_src = scatterwalk_ffwd(req_ctx->src, req->src,
 269                                                       lzeros);
 270                 req_ctx->fixup_src_len = req->src_len - lzeros;
 271         } else {
 272                 /*
 273                  * input src is less then n key modulus,
 274                  * so there will be zero padding
 275                  */
 276                 diff_size = key->n_sz - req->src_len;
 277                 req_ctx->fixup_src = req->src;
 278                 req_ctx->fixup_src_len = req->src_len;
 279         }
 280
 281         src_nents = sg_nents_for_len(req_ctx->fixup_src,
 282                                      req_ctx->fixup_src_len);
 283         dst_nents = sg_nents_for_len(req->dst, req->dst_len);
 284
 285         mapped_src_nents = dma_map_sg(dev, req_ctx->fixup_src, src_nents,
 286                                       DMA_TO_DEVICE);
 287         if (unlikely(!mapped_src_nents)) {
 288                 dev_err(dev, "unable to map source\n");
 289                 return ERR_PTR(-ENOMEM);
 290         }
 291         mapped_dst_nents = dma_map_sg(dev, req->dst, dst_nents,
 292                                       DMA_FROM_DEVICE);
 293         if (unlikely(!mapped_dst_nents)) {
 294                 dev_err(dev, "unable to map destination\n");
 295                 goto src_fail;
 296         }
 297
 298         if (!diff_size && mapped_src_nents == 1)
 299                 sec4_sg_len = 0; /* no need for an input hw s/g table */
 300         else
 301                 sec4_sg_len = mapped_src_nents + !!diff_size;
 302         sec4_sg_index = sec4_sg_len;
 303
 304         if (mapped_dst_nents > 1)
 305                 sec4_sg_len += pad_sg_nents(mapped_dst_nents);
 306         else
 307                 sec4_sg_len = pad_sg_nents(sec4_sg_len);
 308
 309         sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
 310
 311         /* allocate space for base edesc, hw desc commands and link tables */
 312         edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes,
 313                         GFP_DMA | flags);
 314         if (!edesc)
 315                 goto dst_fail;
 316
 317         edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen;
 318         if (diff_size)
 319                 dma_to_sec4_sg_one(edesc->sec4_sg, ctx->padding_dma, diff_size,
 320                                    0);
 321
 322         if (sec4_sg_index)
 323                 sg_to_sec4_sg_last(req_ctx->fixup_src, req_ctx->fixup_src_len,
 324                                    edesc->sec4_sg + !!diff_size, 0);
 325
 326         if (mapped_dst_nents > 1)
 327                 sg_to_sec4_sg_last(req->dst, req->dst_len,
 328                                    edesc->sec4_sg + sec4_sg_index, 0);
 329
 330         /* Save nents for later use in Job Descriptor */
 331         edesc->src_nents = src_nents;
 332         edesc->dst_nents = dst_nents;
 333
 334         req_ctx->edesc = edesc;
 335
 336         if (!sec4_sg_bytes)
 337                 return edesc;
 338
 339         edesc->mapped_src_nents = mapped_src_nents;
 340         edesc->mapped_dst_nents = mapped_dst_nents;
 341
 342         edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg,
 343                                             sec4_sg_bytes, DMA_TO_DEVICE);
 344         if (dma_mapping_error(dev, edesc->sec4_sg_dma)) {
 345                 dev_err(dev, "unable to map S/G table\n");
 346                 goto sec4_sg_fail;
 347         }
 348
 349         edesc->sec4_sg_bytes = sec4_sg_bytes;
 350
 351         print_hex_dump_debug("caampkc sec4_sg@" __stringify(__LINE__) ": ",
 352                              DUMP_PREFIX_ADDRESS, 16, 4, edesc->sec4_sg,
 353                              edesc->sec4_sg_bytes, 1);
 354
 355         return edesc;
 356
 357 sec4_sg_fail:
 358         kfree(edesc);
 359 dst_fail:
 360         dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
 361 src_fail:
 362         dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
 363         return ERR_PTR(-ENOMEM);
 364 }
 365
 366 static int akcipher_do_one_req(struct crypto_engine *engine, void *areq)
 367 {
 368         struct akcipher_request *req = container_of(areq,
 369                                                     struct akcipher_request,
 370                                                     base);
 371         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 372         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 373         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 374         struct device *jrdev = ctx->dev;
 375         u32 *desc = req_ctx->edesc->hw_desc;
 376         int ret;
 377
 378         req_ctx->edesc->bklog = true;
 379
 380         ret = caam_jr_enqueue(jrdev, desc, req_ctx->akcipher_op_done, req);
 381
 382         if (ret != -EINPROGRESS) {
 383                 rsa_pub_unmap(jrdev, req_ctx->edesc, req);
 384                 rsa_io_unmap(jrdev, req_ctx->edesc, req);
 385                 kfree(req_ctx->edesc);
 386         } else {
 387                 ret = 0;
 388         }
 389
 390         return ret;
 391 }
 392
 393 static int set_rsa_pub_pdb(struct akcipher_request *req,
 394                            struct rsa_edesc *edesc)
 395 {
 396         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 397         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 398         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 399         struct caam_rsa_key *key = &ctx->key;
 400         struct device *dev = ctx->dev;
 401         struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
 402         int sec4_sg_index = 0;
 403
 404         pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
 405         if (dma_mapping_error(dev, pdb->n_dma)) {
 406                 dev_err(dev, "Unable to map RSA modulus memory\n");
 407                 return -ENOMEM;
 408         }
 409
 410         pdb->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE);
 411         if (dma_mapping_error(dev, pdb->e_dma)) {
 412                 dev_err(dev, "Unable to map RSA public exponent memory\n");
 413                 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
 414                 return -ENOMEM;
 415         }
 416
 417         if (edesc->mapped_src_nents > 1) {
 418                 pdb->sgf |= RSA_PDB_SGF_F;
 419                 pdb->f_dma = edesc->sec4_sg_dma;
 420                 sec4_sg_index += edesc->mapped_src_nents;
 421         } else {
 422                 pdb->f_dma = sg_dma_address(req_ctx->fixup_src);
 423         }
 424
 425         if (edesc->mapped_dst_nents > 1) {
 426                 pdb->sgf |= RSA_PDB_SGF_G;
 427                 pdb->g_dma = edesc->sec4_sg_dma +
 428                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 429         } else {
 430                 pdb->g_dma = sg_dma_address(req->dst);
 431         }
 432
 433         pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
 434         pdb->f_len = req_ctx->fixup_src_len;
 435
 436         return 0;
 437 }
 438
 439 static int set_rsa_priv_f1_pdb(struct akcipher_request *req,
 440                                struct rsa_edesc *edesc)
 441 {
 442         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 443         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 444         struct caam_rsa_key *key = &ctx->key;
 445         struct device *dev = ctx->dev;
 446         struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
 447         int sec4_sg_index = 0;
 448
 449         pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
 450         if (dma_mapping_error(dev, pdb->n_dma)) {
 451                 dev_err(dev, "Unable to map modulus memory\n");
 452                 return -ENOMEM;
 453         }
 454
 455         pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
 456         if (dma_mapping_error(dev, pdb->d_dma)) {
 457                 dev_err(dev, "Unable to map RSA private exponent memory\n");
 458                 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
 459                 return -ENOMEM;
 460         }
 461
 462         if (edesc->mapped_src_nents > 1) {
 463                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 464                 pdb->g_dma = edesc->sec4_sg_dma;
 465                 sec4_sg_index += edesc->mapped_src_nents;
 466
 467         } else {
 468                 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 469
 470                 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
 471         }
 472
 473         if (edesc->mapped_dst_nents > 1) {
 474                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 475                 pdb->f_dma = edesc->sec4_sg_dma +
 476                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 477         } else {
 478                 pdb->f_dma = sg_dma_address(req->dst);
 479         }
 480
 481         pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
 482
 483         return 0;
 484 }
 485
 486 static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
 487                                struct rsa_edesc *edesc)
 488 {
 489         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 490         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 491         struct caam_rsa_key *key = &ctx->key;
 492         struct device *dev = ctx->dev;
 493         struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
 494         int sec4_sg_index = 0;
 495         size_t p_sz = key->p_sz;
 496         size_t q_sz = key->q_sz;
 497
 498         pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
 499         if (dma_mapping_error(dev, pdb->d_dma)) {
 500                 dev_err(dev, "Unable to map RSA private exponent memory\n");
 501                 return -ENOMEM;
 502         }
 503
 504         pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
 505         if (dma_mapping_error(dev, pdb->p_dma)) {
 506                 dev_err(dev, "Unable to map RSA prime factor p memory\n");
 507                 goto unmap_d;
 508         }
 509
 510         pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
 511         if (dma_mapping_error(dev, pdb->q_dma)) {
 512                 dev_err(dev, "Unable to map RSA prime factor q memory\n");
 513                 goto unmap_p;
 514         }
 515
 516         pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 517         if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 518                 dev_err(dev, "Unable to map RSA tmp1 memory\n");
 519                 goto unmap_q;
 520         }
 521
 522         pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 523         if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 524                 dev_err(dev, "Unable to map RSA tmp2 memory\n");
 525                 goto unmap_tmp1;
 526         }
 527
 528         if (edesc->mapped_src_nents > 1) {
 529                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 530                 pdb->g_dma = edesc->sec4_sg_dma;
 531                 sec4_sg_index += edesc->mapped_src_nents;
 532         } else {
 533                 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 534
 535                 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
 536         }
 537
 538         if (edesc->mapped_dst_nents > 1) {
 539                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 540                 pdb->f_dma = edesc->sec4_sg_dma +
 541                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 542         } else {
 543                 pdb->f_dma = sg_dma_address(req->dst);
 544         }
 545
 546         pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
 547         pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
 548
 549         return 0;
 550
 551 unmap_tmp1:
 552         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 553 unmap_q:
 554         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 555 unmap_p:
 556         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 557 unmap_d:
 558         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
 559
 560         return -ENOMEM;
 561 }
 562
 563 static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
 564                                struct rsa_edesc *edesc)
 565 {
 566         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 567         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 568         struct caam_rsa_key *key = &ctx->key;
 569         struct device *dev = ctx->dev;
 570         struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
 571         int sec4_sg_index = 0;
 572         size_t p_sz = key->p_sz;
 573         size_t q_sz = key->q_sz;
 574
 575         pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
 576         if (dma_mapping_error(dev, pdb->p_dma)) {
 577                 dev_err(dev, "Unable to map RSA prime factor p memory\n");
 578                 return -ENOMEM;
 579         }
 580
 581         pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
 582         if (dma_mapping_error(dev, pdb->q_dma)) {
 583                 dev_err(dev, "Unable to map RSA prime factor q memory\n");
 584                 goto unmap_p;
 585         }
 586
 587         pdb->dp_dma = dma_map_single(dev, key->dp, p_sz, DMA_TO_DEVICE);
 588         if (dma_mapping_error(dev, pdb->dp_dma)) {
 589                 dev_err(dev, "Unable to map RSA exponent dp memory\n");
 590                 goto unmap_q;
 591         }
 592
 593         pdb->dq_dma = dma_map_single(dev, key->dq, q_sz, DMA_TO_DEVICE);
 594         if (dma_mapping_error(dev, pdb->dq_dma)) {
 595                 dev_err(dev, "Unable to map RSA exponent dq memory\n");
 596                 goto unmap_dp;
 597         }
 598
 599         pdb->c_dma = dma_map_single(dev, key->qinv, p_sz, DMA_TO_DEVICE);
 600         if (dma_mapping_error(dev, pdb->c_dma)) {
 601                 dev_err(dev, "Unable to map RSA CRT coefficient qinv memory\n");
 602                 goto unmap_dq;
 603         }
 604
 605         pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 606         if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 607                 dev_err(dev, "Unable to map RSA tmp1 memory\n");
 608                 goto unmap_qinv;
 609         }
 610
 611         pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 612         if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 613                 dev_err(dev, "Unable to map RSA tmp2 memory\n");
 614                 goto unmap_tmp1;
 615         }
 616
 617         if (edesc->mapped_src_nents > 1) {
 618                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 619                 pdb->g_dma = edesc->sec4_sg_dma;
 620                 sec4_sg_index += edesc->mapped_src_nents;
 621         } else {
 622                 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 623
 624                 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
 625         }
 626
 627         if (edesc->mapped_dst_nents > 1) {
 628                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 629                 pdb->f_dma = edesc->sec4_sg_dma +
 630                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 631         } else {
 632                 pdb->f_dma = sg_dma_address(req->dst);
 633         }
 634
 635         pdb->sgf |= key->n_sz;
 636         pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
 637
 638         return 0;
 639
 640 unmap_tmp1:
 641         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 642 unmap_qinv:
 643         dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
 644 unmap_dq:
 645         dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
 646 unmap_dp:
 647         dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
 648 unmap_q:
 649         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 650 unmap_p:
 651         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 652
 653         return -ENOMEM;
 654 }
 655
 656 static int akcipher_enqueue_req(struct device *jrdev,
 657                                 void (*cbk)(struct device *jrdev, u32 *desc,
 658                                             u32 err, void *context),
 659                                 struct akcipher_request *req)
 660 {
 661         struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev);
 662         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 663         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 664         struct caam_rsa_key *key = &ctx->key;
 665         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 666         struct rsa_edesc *edesc = req_ctx->edesc;
 667         u32 *desc = edesc->hw_desc;
 668         int ret;
 669
 670         req_ctx->akcipher_op_done = cbk;
 671         /*
 672          * Only the backlog request are sent to crypto-engine since the others
 673          * can be handled by CAAM, if free, especially since JR has up to 1024
 674          * entries (more than the 10 entries from crypto-engine).
 675          */
 676         if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)
 677                 ret = crypto_transfer_akcipher_request_to_engine(jrpriv->engine,
 678                                                                  req);
 679         else
 680                 ret = caam_jr_enqueue(jrdev, desc, cbk, req);
 681
 682         if ((ret != -EINPROGRESS) && (ret != -EBUSY)) {
 683                 switch (key->priv_form) {
 684                 case FORM1:
 685                         rsa_priv_f1_unmap(jrdev, edesc, req);
 686                         break;
 687                 case FORM2:
 688                         rsa_priv_f2_unmap(jrdev, edesc, req);
 689                         break;
 690                 case FORM3:
 691                         rsa_priv_f3_unmap(jrdev, edesc, req);
 692                         break;
 693                 default:
 694                         rsa_pub_unmap(jrdev, edesc, req);
 695                 }
 696                 rsa_io_unmap(jrdev, edesc, req);
 697                 kfree(edesc);
 698         }
 699
 700         return ret;
 701 }
 702
 703 static int caam_rsa_enc(struct akcipher_request *req)
 704 {
 705         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 706         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 707         struct caam_rsa_key *key = &ctx->key;
 708         struct device *jrdev = ctx->dev;
 709         struct rsa_edesc *edesc;
 710         int ret;
 711
 712         if (unlikely(!key->n || !key->e))
 713                 return -EINVAL;
 714
 715         if (req->dst_len < key->n_sz) {
 716                 req->dst_len = key->n_sz;
 717                 dev_err(jrdev, "Output buffer length less than parameter n\n");
 718                 return -EOVERFLOW;
 719         }
 720
 721         /* Allocate extended descriptor */
 722         edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN);
 723         if (IS_ERR(edesc))
 724                 return PTR_ERR(edesc);
 725
 726         /* Set RSA Encrypt Protocol Data Block */
 727         ret = set_rsa_pub_pdb(req, edesc);
 728         if (ret)
 729                 goto init_fail;
 730
 731         /* Initialize Job Descriptor */
 732         init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
 733
 734         return akcipher_enqueue_req(jrdev, rsa_pub_done, req);
 735
 736 init_fail:
 737         rsa_io_unmap(jrdev, edesc, req);
 738         kfree(edesc);
 739         return ret;
 740 }
 741
 742 static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
 743 {
 744         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 745         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 746         struct device *jrdev = ctx->dev;
 747         struct rsa_edesc *edesc;
 748         int ret;
 749
 750         /* Allocate extended descriptor */
 751         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F1_LEN);
 752         if (IS_ERR(edesc))
 753                 return PTR_ERR(edesc);
 754
 755         /* Set RSA Decrypt Protocol Data Block - Private Key Form #1 */
 756         ret = set_rsa_priv_f1_pdb(req, edesc);
 757         if (ret)
 758                 goto init_fail;
 759
 760         /* Initialize Job Descriptor */
 761         init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
 762
 763         return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
 764
 765 init_fail:
 766         rsa_io_unmap(jrdev, edesc, req);
 767         kfree(edesc);
 768         return ret;
 769 }
 770
 771 static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
 772 {
 773         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 774         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 775         struct device *jrdev = ctx->dev;
 776         struct rsa_edesc *edesc;
 777         int ret;
 778
 779         /* Allocate extended descriptor */
 780         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN);
 781         if (IS_ERR(edesc))
 782                 return PTR_ERR(edesc);
 783
 784         /* Set RSA Decrypt Protocol Data Block - Private Key Form #2 */
 785         ret = set_rsa_priv_f2_pdb(req, edesc);
 786         if (ret)
 787                 goto init_fail;
 788
 789         /* Initialize Job Descriptor */
 790         init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
 791
 792         return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
 793
 794 init_fail:
 795         rsa_io_unmap(jrdev, edesc, req);
 796         kfree(edesc);
 797         return ret;
 798 }
 799
 800 static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
 801 {
 802         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 803         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 804         struct device *jrdev = ctx->dev;
 805         struct rsa_edesc *edesc;
 806         int ret;
 807
 808         /* Allocate extended descriptor */
 809         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN);
 810         if (IS_ERR(edesc))
 811                 return PTR_ERR(edesc);
 812
 813         /* Set RSA Decrypt Protocol Data Block - Private Key Form #3 */
 814         ret = set_rsa_priv_f3_pdb(req, edesc);
 815         if (ret)
 816                 goto init_fail;
 817
 818         /* Initialize Job Descriptor */
 819         init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
 820
 821         return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
 822
 823 init_fail:
 824         rsa_io_unmap(jrdev, edesc, req);
 825         kfree(edesc);
 826         return ret;
 827 }
 828
 829 static int caam_rsa_dec(struct akcipher_request *req)
 830 {
 831         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 832         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 833         struct caam_rsa_key *key = &ctx->key;
 834         int ret;
 835
 836         if (unlikely(!key->n || !key->d))
 837                 return -EINVAL;
 838
 839         if (req->dst_len < key->n_sz) {
 840                 req->dst_len = key->n_sz;
 841                 dev_err(ctx->dev, "Output buffer length less than parameter n\n");
 842                 return -EOVERFLOW;
 843         }
 844
 845         if (key->priv_form == FORM3)
 846                 ret = caam_rsa_dec_priv_f3(req);
 847         else if (key->priv_form == FORM2)
 848                 ret = caam_rsa_dec_priv_f2(req);
 849         else
 850                 ret = caam_rsa_dec_priv_f1(req);
 851
 852         return ret;
 853 }
 854
 855 static void caam_rsa_free_key(struct caam_rsa_key *key)
 856 {
 857         kfree_sensitive(key->d);
 858         kfree_sensitive(key->p);
 859         kfree_sensitive(key->q);
 860         kfree_sensitive(key->dp);
 861         kfree_sensitive(key->dq);
 862         kfree_sensitive(key->qinv);
 863         kfree_sensitive(key->tmp1);
 864         kfree_sensitive(key->tmp2);
 865         kfree(key->e);
 866         kfree(key->n);
 867         memset(key, 0, sizeof(*key));
 868 }
 869
 870 static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes)
 871 {
 872         while (!**ptr && *nbytes) {
 873                 (*ptr)++;
 874                 (*nbytes)--;
 875         }
 876 }
 877
 878 /**
 879  * caam_read_rsa_crt - Used for reading dP, dQ, qInv CRT members.
 880  * dP, dQ and qInv could decode to less than corresponding p, q length, as the
 881  * BER-encoding requires that the minimum number of bytes be used to encode the
 882  * integer. dP, dQ, qInv decoded values have to be zero-padded to appropriate
 883  * length.
 884  *
 885  * @ptr   : pointer to {dP, dQ, qInv} CRT member
 886  * @nbytes: length in bytes of {dP, dQ, qInv} CRT member
 887  * @dstlen: length in bytes of corresponding p or q prime factor
 888  */
 889 static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen)
 890 {
 891         u8 *dst;
 892
 893         caam_rsa_drop_leading_zeros(&ptr, &nbytes);
 894         if (!nbytes)
 895                 return NULL;
 896
 897         dst = kzalloc(dstlen, GFP_DMA | GFP_KERNEL);
 898         if (!dst)
 899                 return NULL;
 900
 901         memcpy(dst + (dstlen - nbytes), ptr, nbytes);
 902
 903         return dst;
 904 }
 905
 906 /**
 907  * caam_read_raw_data - Read a raw byte stream as a positive integer.
 908  * The function skips buffer's leading zeros, copies the remained data
 909  * to a buffer allocated in the GFP_DMA | GFP_KERNEL zone and returns
 910  * the address of the new buffer.
 911  *
 912  * @buf   : The data to read
 913  * @nbytes: The amount of data to read
 914  */
 915 static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
 916 {
 917
 918         caam_rsa_drop_leading_zeros(&buf, nbytes);
 919         if (!*nbytes)
 920                 return NULL;
 921
 922         return kmemdup(buf, *nbytes, GFP_DMA | GFP_KERNEL);
 923 }
 924
 925 static int caam_rsa_check_key_length(unsigned int len)
 926 {
 927         if (len > 4096)
 928                 return -EINVAL;
 929         return 0;
 930 }
 931
 932 static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
 933                                 unsigned int keylen)
 934 {
 935         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 936         struct rsa_key raw_key = {NULL};
 937         struct caam_rsa_key *rsa_key = &ctx->key;
 938         int ret;
 939
 940         /* Free the old RSA key if any */
 941         caam_rsa_free_key(rsa_key);
 942
 943         ret = rsa_parse_pub_key(&raw_key, key, keylen);
 944         if (ret)
 945                 return ret;
 946
 947         /* Copy key in DMA zone */
 948         rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
 949         if (!rsa_key->e)
 950                 goto err;
 951
 952         /*
 953          * Skip leading zeros and copy the positive integer to a buffer
 954          * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
 955          * expects a positive integer for the RSA modulus and uses its length as
 956          * decryption output length.
 957          */
 958         rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
 959         if (!rsa_key->n)
 960                 goto err;
 961
 962         if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
 963                 caam_rsa_free_key(rsa_key);
 964                 return -EINVAL;
 965         }
 966
 967         rsa_key->e_sz = raw_key.e_sz;
 968         rsa_key->n_sz = raw_key.n_sz;
 969
 970         return 0;
 971 err:
 972         caam_rsa_free_key(rsa_key);
 973         return -ENOMEM;
 974 }
 975
 976 static void caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx,
 977                                        struct rsa_key *raw_key)
 978 {
 979         struct caam_rsa_key *rsa_key = &ctx->key;
 980         size_t p_sz = raw_key->p_sz;
 981         size_t q_sz = raw_key->q_sz;
 982
 983         rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz);
 984         if (!rsa_key->p)
 985                 return;
 986         rsa_key->p_sz = p_sz;
 987
 988         rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz);
 989         if (!rsa_key->q)
 990                 goto free_p;
 991         rsa_key->q_sz = q_sz;
 992
 993         rsa_key->tmp1 = kzalloc(raw_key->p_sz, GFP_DMA | GFP_KERNEL);
 994         if (!rsa_key->tmp1)
 995                 goto free_q;
 996
 997         rsa_key->tmp2 = kzalloc(raw_key->q_sz, GFP_DMA | GFP_KERNEL);
 998         if (!rsa_key->tmp2)
 999                 goto free_tmp1;
1000
1001         rsa_key->priv_form = FORM2;
1002
1003         rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz);
1004         if (!rsa_key->dp)
1005                 goto free_tmp2;
1006
1007         rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz);
1008         if (!rsa_key->dq)
1009                 goto free_dp;
1010
1011         rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz,
1012                                           q_sz);
1013         if (!rsa_key->qinv)
1014                 goto free_dq;
1015
1016         rsa_key->priv_form = FORM3;
1017
1018         return;
1019
1020 free_dq:
1021         kfree_sensitive(rsa_key->dq);
1022 free_dp:
1023         kfree_sensitive(rsa_key->dp);
1024 free_tmp2:
1025         kfree_sensitive(rsa_key->tmp2);
1026 free_tmp1:
1027         kfree_sensitive(rsa_key->tmp1);
1028 free_q:
1029         kfree_sensitive(rsa_key->q);
1030 free_p:
1031         kfree_sensitive(rsa_key->p);
1032 }
1033
1034 static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
1035                                  unsigned int keylen)
1036 {
1037         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1038         struct rsa_key raw_key = {NULL};
1039         struct caam_rsa_key *rsa_key = &ctx->key;
1040         int ret;
1041
1042         /* Free the old RSA key if any */
1043         caam_rsa_free_key(rsa_key);
1044
1045         ret = rsa_parse_priv_key(&raw_key, key, keylen);
1046         if (ret)
1047                 return ret;
1048
1049         /* Copy key in DMA zone */
1050         rsa_key->d = kmemdup(raw_key.d, raw_key.d_sz, GFP_DMA | GFP_KERNEL);
1051         if (!rsa_key->d)
1052                 goto err;
1053
1054         rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
1055         if (!rsa_key->e)
1056                 goto err;
1057
1058         /*
1059          * Skip leading zeros and copy the positive integer to a buffer
1060          * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
1061          * expects a positive integer for the RSA modulus and uses its length as
1062          * decryption output length.
1063          */
1064         rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
1065         if (!rsa_key->n)
1066                 goto err;
1067
1068         if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
1069                 caam_rsa_free_key(rsa_key);
1070                 return -EINVAL;
1071         }
1072
1073         rsa_key->d_sz = raw_key.d_sz;
1074         rsa_key->e_sz = raw_key.e_sz;
1075         rsa_key->n_sz = raw_key.n_sz;
1076
1077         caam_rsa_set_priv_key_form(ctx, &raw_key);
1078
1079         return 0;
1080
1081 err:
1082         caam_rsa_free_key(rsa_key);
1083         return -ENOMEM;
1084 }
1085
1086 static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm)
1087 {
1088         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1089
1090         return ctx->key.n_sz;
1091 }
1092
1093 /* Per session pkc's driver context creation function */
1094 static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
1095 {
1096         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1097
1098         ctx->dev = caam_jr_alloc();
1099
1100         if (IS_ERR(ctx->dev)) {
1101                 pr_err("Job Ring Device allocation for transform failed\n");
1102                 return PTR_ERR(ctx->dev);
1103         }
1104
1105         ctx->padding_dma = dma_map_single(ctx->dev, zero_buffer,
1106                                           CAAM_RSA_MAX_INPUT_SIZE - 1,
1107                                           DMA_TO_DEVICE);
1108         if (dma_mapping_error(ctx->dev, ctx->padding_dma)) {
1109                 dev_err(ctx->dev, "unable to map padding\n");
1110                 caam_jr_free(ctx->dev);
1111                 return -ENOMEM;
1112         }
1113
1114         ctx->enginectx.op.do_one_request = akcipher_do_one_req;
1115
1116         return 0;
1117 }
1118
1119 /* Per session pkc's driver context cleanup function */
1120 static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm)
1121 {
1122         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1123         struct caam_rsa_key *key = &ctx->key;
1124
1125         dma_unmap_single(ctx->dev, ctx->padding_dma, CAAM_RSA_MAX_INPUT_SIZE -
1126                          1, DMA_TO_DEVICE);
1127         caam_rsa_free_key(key);
1128         caam_jr_free(ctx->dev);
1129 }
1130
1131 static struct caam_akcipher_alg caam_rsa = {
1132         .akcipher = {
1133                 .encrypt = caam_rsa_enc,
1134                 .decrypt = caam_rsa_dec,
1135                 .set_pub_key = caam_rsa_set_pub_key,
1136                 .set_priv_key = caam_rsa_set_priv_key,
1137                 .max_size = caam_rsa_max_size,
1138                 .init = caam_rsa_init_tfm,
1139                 .exit = caam_rsa_exit_tfm,
1140                 .reqsize = sizeof(struct caam_rsa_req_ctx),
1141                 .base = {
1142                         .cra_name = "rsa",
1143                         .cra_driver_name = "rsa-caam",
1144                         .cra_priority = 3000,
1145                         .cra_module = THIS_MODULE,
1146                         .cra_ctxsize = sizeof(struct caam_rsa_ctx),
1147                 },
1148         }
1149 };
1150
1151 /* Public Key Cryptography module initialization handler */
1152 int caam_pkc_init(struct device *ctrldev)
1153 {
1154         struct caam_drv_private *priv = dev_get_drvdata(ctrldev);
1155         u32 pk_inst;
1156         int err;
1157         init_done = false;
1158
1159         /* Determine public key hardware accelerator presence. */
1160         if (priv->era < 10)
1161                 pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) &
1162                            CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT;
1163         else
1164                 pk_inst = rd_reg32(&priv->ctrl->vreg.pkha) & CHA_VER_NUM_MASK;
1165
1166         /* Do not register algorithms if PKHA is not present. */
1167         if (!pk_inst)
1168                 return 0;
1169
1170         /* allocate zero buffer, used for padding input */
1171         zero_buffer = kzalloc(CAAM_RSA_MAX_INPUT_SIZE - 1, GFP_DMA |
1172                               GFP_KERNEL);
1173         if (!zero_buffer)
1174                 return -ENOMEM;
1175
1176         err = crypto_register_akcipher(&caam_rsa.akcipher);
1177
1178         if (err) {
1179                 kfree(zero_buffer);
1180                 dev_warn(ctrldev, "%s alg registration failed\n",
1181                          caam_rsa.akcipher.base.cra_driver_name);
1182         } else {
1183                 init_done = true;
1184                 caam_rsa.registered = true;
1185                 dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n");
1186         }
1187
1188         return err;
1189 }
1190
1191 void caam_pkc_exit(void)
1192 {
1193         if (!init_done)
1194                 return;
1195
1196         if (caam_rsa.registered)
1197                 crypto_unregister_akcipher(&caam_rsa.akcipher);
1198
1199         kfree(zero_buffer);
1200 }