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, 2023 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 #include <crypto/internal/engine.h>
  20 #include <linux/dma-mapping.h>
  21 #include <linux/err.h>
  22 #include <linux/kernel.h>
  23 #include <linux/slab.h>
  24 #include <linux/string.h>
  25
  26 #define DESC_RSA_PUB_LEN        (2 * CAAM_CMD_SZ + SIZEOF_RSA_PUB_PDB)
  27 #define DESC_RSA_PRIV_F1_LEN    (2 * CAAM_CMD_SZ + \
  28                                  SIZEOF_RSA_PRIV_F1_PDB)
  29 #define DESC_RSA_PRIV_F2_LEN    (2 * CAAM_CMD_SZ + \
  30                                  SIZEOF_RSA_PRIV_F2_PDB)
  31 #define DESC_RSA_PRIV_F3_LEN    (2 * CAAM_CMD_SZ + \
  32                                  SIZEOF_RSA_PRIV_F3_PDB)
  33 #define CAAM_RSA_MAX_INPUT_SIZE 512 /* for a 4096-bit modulus */
  34
  35 /* buffer filled with zeros, used for padding */
  36 static u8 *zero_buffer;
  37
  38 /*
  39  * variable used to avoid double free of resources in case
  40  * algorithm registration was unsuccessful
  41  */
  42 static bool init_done;
  43
  44 struct caam_akcipher_alg {
  45         struct akcipher_engine_alg akcipher;
  46         bool registered;
  47 };
  48
  49 static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc,
  50                          struct akcipher_request *req)
  51 {
  52         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
  53
  54         dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
  55         dma_unmap_sg(dev, req_ctx->fixup_src, edesc->src_nents, DMA_TO_DEVICE);
  56
  57         if (edesc->sec4_sg_bytes)
  58                 dma_unmap_single(dev, edesc->sec4_sg_dma, edesc->sec4_sg_bytes,
  59                                  DMA_TO_DEVICE);
  60 }
  61
  62 static void rsa_pub_unmap(struct device *dev, struct rsa_edesc *edesc,
  63                           struct akcipher_request *req)
  64 {
  65         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  66         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
  67         struct caam_rsa_key *key = &ctx->key;
  68         struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
  69
  70         dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
  71         dma_unmap_single(dev, pdb->e_dma, key->e_sz, DMA_TO_DEVICE);
  72 }
  73
  74 static void rsa_priv_f1_unmap(struct device *dev, struct rsa_edesc *edesc,
  75                               struct akcipher_request *req)
  76 {
  77         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  78         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
  79         struct caam_rsa_key *key = &ctx->key;
  80         struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
  81
  82         dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
  83         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
  84 }
  85
  86 static void rsa_priv_f2_unmap(struct device *dev, struct rsa_edesc *edesc,
  87                               struct akcipher_request *req)
  88 {
  89         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  90         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
  91         struct caam_rsa_key *key = &ctx->key;
  92         struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
  93         size_t p_sz = key->p_sz;
  94         size_t q_sz = key->q_sz;
  95
  96         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
  97         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
  98         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
  99         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 100         dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
 101 }
 102
 103 static void rsa_priv_f3_unmap(struct device *dev, struct rsa_edesc *edesc,
 104                               struct akcipher_request *req)
 105 {
 106         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 107         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 108         struct caam_rsa_key *key = &ctx->key;
 109         struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
 110         size_t p_sz = key->p_sz;
 111         size_t q_sz = key->q_sz;
 112
 113         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 114         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 115         dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
 116         dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
 117         dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
 118         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 119         dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
 120 }
 121
 122 /* RSA Job Completion handler */
 123 static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
 124 {
 125         struct akcipher_request *req = context;
 126         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 127         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 128         struct rsa_edesc *edesc;
 129         int ecode = 0;
 130         bool has_bklog;
 131
 132         if (err)
 133                 ecode = caam_jr_strstatus(dev, err);
 134
 135         edesc = req_ctx->edesc;
 136         has_bklog = edesc->bklog;
 137
 138         rsa_pub_unmap(dev, edesc, req);
 139         rsa_io_unmap(dev, edesc, req);
 140         kfree(edesc);
 141
 142         /*
 143          * If no backlog flag, the completion of the request is done
 144          * by CAAM, not crypto engine.
 145          */
 146         if (!has_bklog)
 147                 akcipher_request_complete(req, ecode);
 148         else
 149                 crypto_finalize_akcipher_request(jrp->engine, req, ecode);
 150 }
 151
 152 static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
 153                             void *context)
 154 {
 155         struct akcipher_request *req = context;
 156         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 157         struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
 158         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 159         struct caam_rsa_key *key = &ctx->key;
 160         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 161         struct rsa_edesc *edesc;
 162         int ecode = 0;
 163         bool has_bklog;
 164
 165         if (err)
 166                 ecode = caam_jr_strstatus(dev, err);
 167
 168         edesc = req_ctx->edesc;
 169         has_bklog = edesc->bklog;
 170
 171         switch (key->priv_form) {
 172         case FORM1:
 173                 rsa_priv_f1_unmap(dev, edesc, req);
 174                 break;
 175         case FORM2:
 176                 rsa_priv_f2_unmap(dev, edesc, req);
 177                 break;
 178         case FORM3:
 179                 rsa_priv_f3_unmap(dev, edesc, req);
 180         }
 181
 182         rsa_io_unmap(dev, edesc, req);
 183         kfree(edesc);
 184
 185         /*
 186          * If no backlog flag, the completion of the request is done
 187          * by CAAM, not crypto engine.
 188          */
 189         if (!has_bklog)
 190                 akcipher_request_complete(req, ecode);
 191         else
 192                 crypto_finalize_akcipher_request(jrp->engine, req, ecode);
 193 }
 194
 195 /**
 196  * caam_rsa_count_leading_zeros - Count leading zeros, need it to strip,
 197  *                                from a given scatterlist
 198  *
 199  * @sgl   : scatterlist to count zeros from
 200  * @nbytes: number of zeros, in bytes, to strip
 201  * @flags : operation flags
 202  */
 203 static int caam_rsa_count_leading_zeros(struct scatterlist *sgl,
 204                                         unsigned int nbytes,
 205                                         unsigned int flags)
 206 {
 207         struct sg_mapping_iter miter;
 208         int lzeros, ents;
 209         unsigned int len;
 210         unsigned int tbytes = nbytes;
 211         const u8 *buff;
 212
 213         ents = sg_nents_for_len(sgl, nbytes);
 214         if (ents < 0)
 215                 return ents;
 216
 217         sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags);
 218
 219         lzeros = 0;
 220         len = 0;
 221         while (nbytes > 0) {
 222                 /* do not strip more than given bytes */
 223                 while (len && !*buff && lzeros < nbytes) {
 224                         lzeros++;
 225                         len--;
 226                         buff++;
 227                 }
 228
 229                 if (len && *buff)
 230                         break;
 231
 232                 if (!sg_miter_next(&miter))
 233                         break;
 234
 235                 buff = miter.addr;
 236                 len = miter.length;
 237
 238                 nbytes -= lzeros;
 239                 lzeros = 0;
 240         }
 241
 242         miter.consumed = lzeros;
 243         sg_miter_stop(&miter);
 244         nbytes -= lzeros;
 245
 246         return tbytes - nbytes;
 247 }
 248
 249 static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
 250                                          size_t desclen)
 251 {
 252         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 253         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 254         struct device *dev = ctx->dev;
 255         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 256         struct caam_rsa_key *key = &ctx->key;
 257         struct rsa_edesc *edesc;
 258         gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
 259                        GFP_KERNEL : GFP_ATOMIC;
 260         int sg_flags = (flags == GFP_ATOMIC) ? SG_MITER_ATOMIC : 0;
 261         int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
 262         int src_nents, dst_nents;
 263         int mapped_src_nents, mapped_dst_nents;
 264         unsigned int diff_size = 0;
 265         int lzeros;
 266
 267         if (req->src_len > key->n_sz) {
 268                 /*
 269                  * strip leading zeros and
 270                  * return the number of zeros to skip
 271                  */
 272                 lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len -
 273                                                       key->n_sz, sg_flags);
 274                 if (lzeros < 0)
 275                         return ERR_PTR(lzeros);
 276
 277                 req_ctx->fixup_src = scatterwalk_ffwd(req_ctx->src, req->src,
 278                                                       lzeros);
 279                 req_ctx->fixup_src_len = req->src_len - lzeros;
 280         } else {
 281                 /*
 282                  * input src is less then n key modulus,
 283                  * so there will be zero padding
 284                  */
 285                 diff_size = key->n_sz - req->src_len;
 286                 req_ctx->fixup_src = req->src;
 287                 req_ctx->fixup_src_len = req->src_len;
 288         }
 289
 290         src_nents = sg_nents_for_len(req_ctx->fixup_src,
 291                                      req_ctx->fixup_src_len);
 292         dst_nents = sg_nents_for_len(req->dst, req->dst_len);
 293
 294         mapped_src_nents = dma_map_sg(dev, req_ctx->fixup_src, src_nents,
 295                                       DMA_TO_DEVICE);
 296         if (unlikely(!mapped_src_nents)) {
 297                 dev_err(dev, "unable to map source\n");
 298                 return ERR_PTR(-ENOMEM);
 299         }
 300         mapped_dst_nents = dma_map_sg(dev, req->dst, dst_nents,
 301                                       DMA_FROM_DEVICE);
 302         if (unlikely(!mapped_dst_nents)) {
 303                 dev_err(dev, "unable to map destination\n");
 304                 goto src_fail;
 305         }
 306
 307         if (!diff_size && mapped_src_nents == 1)
 308                 sec4_sg_len = 0; /* no need for an input hw s/g table */
 309         else
 310                 sec4_sg_len = mapped_src_nents + !!diff_size;
 311         sec4_sg_index = sec4_sg_len;
 312
 313         if (mapped_dst_nents > 1)
 314                 sec4_sg_len += pad_sg_nents(mapped_dst_nents);
 315         else
 316                 sec4_sg_len = pad_sg_nents(sec4_sg_len);
 317
 318         sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
 319
 320         /* allocate space for base edesc, hw desc commands and link tables */
 321         edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes, flags);
 322         if (!edesc)
 323                 goto dst_fail;
 324
 325         edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen;
 326         if (diff_size)
 327                 dma_to_sec4_sg_one(edesc->sec4_sg, ctx->padding_dma, diff_size,
 328                                    0);
 329
 330         if (sec4_sg_index)
 331                 sg_to_sec4_sg_last(req_ctx->fixup_src, req_ctx->fixup_src_len,
 332                                    edesc->sec4_sg + !!diff_size, 0);
 333
 334         if (mapped_dst_nents > 1)
 335                 sg_to_sec4_sg_last(req->dst, req->dst_len,
 336                                    edesc->sec4_sg + sec4_sg_index, 0);
 337
 338         /* Save nents for later use in Job Descriptor */
 339         edesc->src_nents = src_nents;
 340         edesc->dst_nents = dst_nents;
 341
 342         req_ctx->edesc = edesc;
 343
 344         if (!sec4_sg_bytes)
 345                 return edesc;
 346
 347         edesc->mapped_src_nents = mapped_src_nents;
 348         edesc->mapped_dst_nents = mapped_dst_nents;
 349
 350         edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg,
 351                                             sec4_sg_bytes, DMA_TO_DEVICE);
 352         if (dma_mapping_error(dev, edesc->sec4_sg_dma)) {
 353                 dev_err(dev, "unable to map S/G table\n");
 354                 goto sec4_sg_fail;
 355         }
 356
 357         edesc->sec4_sg_bytes = sec4_sg_bytes;
 358
 359         print_hex_dump_debug("caampkc sec4_sg@" __stringify(__LINE__) ": ",
 360                              DUMP_PREFIX_ADDRESS, 16, 4, edesc->sec4_sg,
 361                              edesc->sec4_sg_bytes, 1);
 362
 363         return edesc;
 364
 365 sec4_sg_fail:
 366         kfree(edesc);
 367 dst_fail:
 368         dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
 369 src_fail:
 370         dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
 371         return ERR_PTR(-ENOMEM);
 372 }
 373
 374 static int akcipher_do_one_req(struct crypto_engine *engine, void *areq)
 375 {
 376         struct akcipher_request *req = container_of(areq,
 377                                                     struct akcipher_request,
 378                                                     base);
 379         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 380         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 381         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 382         struct device *jrdev = ctx->dev;
 383         u32 *desc = req_ctx->edesc->hw_desc;
 384         int ret;
 385
 386         req_ctx->edesc->bklog = true;
 387
 388         ret = caam_jr_enqueue(jrdev, desc, req_ctx->akcipher_op_done, req);
 389
 390         if (ret == -ENOSPC && engine->retry_support)
 391                 return ret;
 392
 393         if (ret != -EINPROGRESS) {
 394                 rsa_pub_unmap(jrdev, req_ctx->edesc, req);
 395                 rsa_io_unmap(jrdev, req_ctx->edesc, req);
 396                 kfree(req_ctx->edesc);
 397         } else {
 398                 ret = 0;
 399         }
 400
 401         return ret;
 402 }
 403
 404 static int set_rsa_pub_pdb(struct akcipher_request *req,
 405                            struct rsa_edesc *edesc)
 406 {
 407         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 408         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 409         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 410         struct caam_rsa_key *key = &ctx->key;
 411         struct device *dev = ctx->dev;
 412         struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
 413         int sec4_sg_index = 0;
 414
 415         pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
 416         if (dma_mapping_error(dev, pdb->n_dma)) {
 417                 dev_err(dev, "Unable to map RSA modulus memory\n");
 418                 return -ENOMEM;
 419         }
 420
 421         pdb->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE);
 422         if (dma_mapping_error(dev, pdb->e_dma)) {
 423                 dev_err(dev, "Unable to map RSA public exponent memory\n");
 424                 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
 425                 return -ENOMEM;
 426         }
 427
 428         if (edesc->mapped_src_nents > 1) {
 429                 pdb->sgf |= RSA_PDB_SGF_F;
 430                 pdb->f_dma = edesc->sec4_sg_dma;
 431                 sec4_sg_index += edesc->mapped_src_nents;
 432         } else {
 433                 pdb->f_dma = sg_dma_address(req_ctx->fixup_src);
 434         }
 435
 436         if (edesc->mapped_dst_nents > 1) {
 437                 pdb->sgf |= RSA_PDB_SGF_G;
 438                 pdb->g_dma = edesc->sec4_sg_dma +
 439                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 440         } else {
 441                 pdb->g_dma = sg_dma_address(req->dst);
 442         }
 443
 444         pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
 445         pdb->f_len = req_ctx->fixup_src_len;
 446
 447         return 0;
 448 }
 449
 450 static int set_rsa_priv_f1_pdb(struct akcipher_request *req,
 451                                struct rsa_edesc *edesc)
 452 {
 453         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 454         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 455         struct caam_rsa_key *key = &ctx->key;
 456         struct device *dev = ctx->dev;
 457         struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
 458         int sec4_sg_index = 0;
 459
 460         pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
 461         if (dma_mapping_error(dev, pdb->n_dma)) {
 462                 dev_err(dev, "Unable to map modulus memory\n");
 463                 return -ENOMEM;
 464         }
 465
 466         pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
 467         if (dma_mapping_error(dev, pdb->d_dma)) {
 468                 dev_err(dev, "Unable to map RSA private exponent memory\n");
 469                 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
 470                 return -ENOMEM;
 471         }
 472
 473         if (edesc->mapped_src_nents > 1) {
 474                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 475                 pdb->g_dma = edesc->sec4_sg_dma;
 476                 sec4_sg_index += edesc->mapped_src_nents;
 477
 478         } else {
 479                 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 480
 481                 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
 482         }
 483
 484         if (edesc->mapped_dst_nents > 1) {
 485                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 486                 pdb->f_dma = edesc->sec4_sg_dma +
 487                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 488         } else {
 489                 pdb->f_dma = sg_dma_address(req->dst);
 490         }
 491
 492         pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
 493
 494         return 0;
 495 }
 496
 497 static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
 498                                struct rsa_edesc *edesc)
 499 {
 500         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 501         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 502         struct caam_rsa_key *key = &ctx->key;
 503         struct device *dev = ctx->dev;
 504         struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
 505         int sec4_sg_index = 0;
 506         size_t p_sz = key->p_sz;
 507         size_t q_sz = key->q_sz;
 508
 509         pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
 510         if (dma_mapping_error(dev, pdb->d_dma)) {
 511                 dev_err(dev, "Unable to map RSA private exponent memory\n");
 512                 return -ENOMEM;
 513         }
 514
 515         pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
 516         if (dma_mapping_error(dev, pdb->p_dma)) {
 517                 dev_err(dev, "Unable to map RSA prime factor p memory\n");
 518                 goto unmap_d;
 519         }
 520
 521         pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
 522         if (dma_mapping_error(dev, pdb->q_dma)) {
 523                 dev_err(dev, "Unable to map RSA prime factor q memory\n");
 524                 goto unmap_p;
 525         }
 526
 527         pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 528         if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 529                 dev_err(dev, "Unable to map RSA tmp1 memory\n");
 530                 goto unmap_q;
 531         }
 532
 533         pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 534         if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 535                 dev_err(dev, "Unable to map RSA tmp2 memory\n");
 536                 goto unmap_tmp1;
 537         }
 538
 539         if (edesc->mapped_src_nents > 1) {
 540                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 541                 pdb->g_dma = edesc->sec4_sg_dma;
 542                 sec4_sg_index += edesc->mapped_src_nents;
 543         } else {
 544                 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 545
 546                 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
 547         }
 548
 549         if (edesc->mapped_dst_nents > 1) {
 550                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 551                 pdb->f_dma = edesc->sec4_sg_dma +
 552                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 553         } else {
 554                 pdb->f_dma = sg_dma_address(req->dst);
 555         }
 556
 557         pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
 558         pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
 559
 560         return 0;
 561
 562 unmap_tmp1:
 563         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 564 unmap_q:
 565         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 566 unmap_p:
 567         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 568 unmap_d:
 569         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
 570
 571         return -ENOMEM;
 572 }
 573
 574 static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
 575                                struct rsa_edesc *edesc)
 576 {
 577         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 578         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 579         struct caam_rsa_key *key = &ctx->key;
 580         struct device *dev = ctx->dev;
 581         struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
 582         int sec4_sg_index = 0;
 583         size_t p_sz = key->p_sz;
 584         size_t q_sz = key->q_sz;
 585
 586         pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
 587         if (dma_mapping_error(dev, pdb->p_dma)) {
 588                 dev_err(dev, "Unable to map RSA prime factor p memory\n");
 589                 return -ENOMEM;
 590         }
 591
 592         pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
 593         if (dma_mapping_error(dev, pdb->q_dma)) {
 594                 dev_err(dev, "Unable to map RSA prime factor q memory\n");
 595                 goto unmap_p;
 596         }
 597
 598         pdb->dp_dma = dma_map_single(dev, key->dp, p_sz, DMA_TO_DEVICE);
 599         if (dma_mapping_error(dev, pdb->dp_dma)) {
 600                 dev_err(dev, "Unable to map RSA exponent dp memory\n");
 601                 goto unmap_q;
 602         }
 603
 604         pdb->dq_dma = dma_map_single(dev, key->dq, q_sz, DMA_TO_DEVICE);
 605         if (dma_mapping_error(dev, pdb->dq_dma)) {
 606                 dev_err(dev, "Unable to map RSA exponent dq memory\n");
 607                 goto unmap_dp;
 608         }
 609
 610         pdb->c_dma = dma_map_single(dev, key->qinv, p_sz, DMA_TO_DEVICE);
 611         if (dma_mapping_error(dev, pdb->c_dma)) {
 612                 dev_err(dev, "Unable to map RSA CRT coefficient qinv memory\n");
 613                 goto unmap_dq;
 614         }
 615
 616         pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 617         if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 618                 dev_err(dev, "Unable to map RSA tmp1 memory\n");
 619                 goto unmap_qinv;
 620         }
 621
 622         pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 623         if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 624                 dev_err(dev, "Unable to map RSA tmp2 memory\n");
 625                 goto unmap_tmp1;
 626         }
 627
 628         if (edesc->mapped_src_nents > 1) {
 629                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 630                 pdb->g_dma = edesc->sec4_sg_dma;
 631                 sec4_sg_index += edesc->mapped_src_nents;
 632         } else {
 633                 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 634
 635                 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
 636         }
 637
 638         if (edesc->mapped_dst_nents > 1) {
 639                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 640                 pdb->f_dma = edesc->sec4_sg_dma +
 641                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 642         } else {
 643                 pdb->f_dma = sg_dma_address(req->dst);
 644         }
 645
 646         pdb->sgf |= key->n_sz;
 647         pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
 648
 649         return 0;
 650
 651 unmap_tmp1:
 652         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 653 unmap_qinv:
 654         dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
 655 unmap_dq:
 656         dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
 657 unmap_dp:
 658         dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
 659 unmap_q:
 660         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 661 unmap_p:
 662         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 663
 664         return -ENOMEM;
 665 }
 666
 667 static int akcipher_enqueue_req(struct device *jrdev,
 668                                 void (*cbk)(struct device *jrdev, u32 *desc,
 669                                             u32 err, void *context),
 670                                 struct akcipher_request *req)
 671 {
 672         struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev);
 673         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 674         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 675         struct caam_rsa_key *key = &ctx->key;
 676         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 677         struct rsa_edesc *edesc = req_ctx->edesc;
 678         u32 *desc = edesc->hw_desc;
 679         int ret;
 680
 681         req_ctx->akcipher_op_done = cbk;
 682         /*
 683          * Only the backlog request are sent to crypto-engine since the others
 684          * can be handled by CAAM, if free, especially since JR has up to 1024
 685          * entries (more than the 10 entries from crypto-engine).
 686          */
 687         if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)
 688                 ret = crypto_transfer_akcipher_request_to_engine(jrpriv->engine,
 689                                                                  req);
 690         else
 691                 ret = caam_jr_enqueue(jrdev, desc, cbk, req);
 692
 693         if ((ret != -EINPROGRESS) && (ret != -EBUSY)) {
 694                 switch (key->priv_form) {
 695                 case FORM1:
 696                         rsa_priv_f1_unmap(jrdev, edesc, req);
 697                         break;
 698                 case FORM2:
 699                         rsa_priv_f2_unmap(jrdev, edesc, req);
 700                         break;
 701                 case FORM3:
 702                         rsa_priv_f3_unmap(jrdev, edesc, req);
 703                         break;
 704                 default:
 705                         rsa_pub_unmap(jrdev, edesc, req);
 706                 }
 707                 rsa_io_unmap(jrdev, edesc, req);
 708                 kfree(edesc);
 709         }
 710
 711         return ret;
 712 }
 713
 714 static int caam_rsa_enc(struct akcipher_request *req)
 715 {
 716         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 717         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 718         struct caam_rsa_key *key = &ctx->key;
 719         struct device *jrdev = ctx->dev;
 720         struct rsa_edesc *edesc;
 721         int ret;
 722
 723         if (unlikely(!key->n || !key->e))
 724                 return -EINVAL;
 725
 726         if (req->dst_len < key->n_sz) {
 727                 req->dst_len = key->n_sz;
 728                 dev_err(jrdev, "Output buffer length less than parameter n\n");
 729                 return -EOVERFLOW;
 730         }
 731
 732         /* Allocate extended descriptor */
 733         edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN);
 734         if (IS_ERR(edesc))
 735                 return PTR_ERR(edesc);
 736
 737         /* Set RSA Encrypt Protocol Data Block */
 738         ret = set_rsa_pub_pdb(req, edesc);
 739         if (ret)
 740                 goto init_fail;
 741
 742         /* Initialize Job Descriptor */
 743         init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
 744
 745         return akcipher_enqueue_req(jrdev, rsa_pub_done, req);
 746
 747 init_fail:
 748         rsa_io_unmap(jrdev, edesc, req);
 749         kfree(edesc);
 750         return ret;
 751 }
 752
 753 static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
 754 {
 755         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 756         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 757         struct device *jrdev = ctx->dev;
 758         struct rsa_edesc *edesc;
 759         int ret;
 760
 761         /* Allocate extended descriptor */
 762         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F1_LEN);
 763         if (IS_ERR(edesc))
 764                 return PTR_ERR(edesc);
 765
 766         /* Set RSA Decrypt Protocol Data Block - Private Key Form #1 */
 767         ret = set_rsa_priv_f1_pdb(req, edesc);
 768         if (ret)
 769                 goto init_fail;
 770
 771         /* Initialize Job Descriptor */
 772         init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
 773
 774         return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
 775
 776 init_fail:
 777         rsa_io_unmap(jrdev, edesc, req);
 778         kfree(edesc);
 779         return ret;
 780 }
 781
 782 static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
 783 {
 784         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 785         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 786         struct device *jrdev = ctx->dev;
 787         struct rsa_edesc *edesc;
 788         int ret;
 789
 790         /* Allocate extended descriptor */
 791         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN);
 792         if (IS_ERR(edesc))
 793                 return PTR_ERR(edesc);
 794
 795         /* Set RSA Decrypt Protocol Data Block - Private Key Form #2 */
 796         ret = set_rsa_priv_f2_pdb(req, edesc);
 797         if (ret)
 798                 goto init_fail;
 799
 800         /* Initialize Job Descriptor */
 801         init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
 802
 803         return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
 804
 805 init_fail:
 806         rsa_io_unmap(jrdev, edesc, req);
 807         kfree(edesc);
 808         return ret;
 809 }
 810
 811 static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
 812 {
 813         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 814         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 815         struct device *jrdev = ctx->dev;
 816         struct rsa_edesc *edesc;
 817         int ret;
 818
 819         /* Allocate extended descriptor */
 820         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN);
 821         if (IS_ERR(edesc))
 822                 return PTR_ERR(edesc);
 823
 824         /* Set RSA Decrypt Protocol Data Block - Private Key Form #3 */
 825         ret = set_rsa_priv_f3_pdb(req, edesc);
 826         if (ret)
 827                 goto init_fail;
 828
 829         /* Initialize Job Descriptor */
 830         init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
 831
 832         return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
 833
 834 init_fail:
 835         rsa_io_unmap(jrdev, edesc, req);
 836         kfree(edesc);
 837         return ret;
 838 }
 839
 840 static int caam_rsa_dec(struct akcipher_request *req)
 841 {
 842         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 843         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 844         struct caam_rsa_key *key = &ctx->key;
 845         int ret;
 846
 847         if (unlikely(!key->n || !key->d))
 848                 return -EINVAL;
 849
 850         if (req->dst_len < key->n_sz) {
 851                 req->dst_len = key->n_sz;
 852                 dev_err(ctx->dev, "Output buffer length less than parameter n\n");
 853                 return -EOVERFLOW;
 854         }
 855
 856         if (key->priv_form == FORM3)
 857                 ret = caam_rsa_dec_priv_f3(req);
 858         else if (key->priv_form == FORM2)
 859                 ret = caam_rsa_dec_priv_f2(req);
 860         else
 861                 ret = caam_rsa_dec_priv_f1(req);
 862
 863         return ret;
 864 }
 865
 866 static void caam_rsa_free_key(struct caam_rsa_key *key)
 867 {
 868         kfree_sensitive(key->d);
 869         kfree_sensitive(key->p);
 870         kfree_sensitive(key->q);
 871         kfree_sensitive(key->dp);
 872         kfree_sensitive(key->dq);
 873         kfree_sensitive(key->qinv);
 874         kfree_sensitive(key->tmp1);
 875         kfree_sensitive(key->tmp2);
 876         kfree(key->e);
 877         kfree(key->n);
 878         memset(key, 0, sizeof(*key));
 879 }
 880
 881 static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes)
 882 {
 883         while (!**ptr && *nbytes) {
 884                 (*ptr)++;
 885                 (*nbytes)--;
 886         }
 887 }
 888
 889 /**
 890  * caam_read_rsa_crt - Used for reading dP, dQ, qInv CRT members.
 891  * dP, dQ and qInv could decode to less than corresponding p, q length, as the
 892  * BER-encoding requires that the minimum number of bytes be used to encode the
 893  * integer. dP, dQ, qInv decoded values have to be zero-padded to appropriate
 894  * length.
 895  *
 896  * @ptr   : pointer to {dP, dQ, qInv} CRT member
 897  * @nbytes: length in bytes of {dP, dQ, qInv} CRT member
 898  * @dstlen: length in bytes of corresponding p or q prime factor
 899  */
 900 static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen)
 901 {
 902         u8 *dst;
 903
 904         caam_rsa_drop_leading_zeros(&ptr, &nbytes);
 905         if (!nbytes)
 906                 return NULL;
 907
 908         dst = kzalloc(dstlen, GFP_KERNEL);
 909         if (!dst)
 910                 return NULL;
 911
 912         memcpy(dst + (dstlen - nbytes), ptr, nbytes);
 913
 914         return dst;
 915 }
 916
 917 /**
 918  * caam_read_raw_data - Read a raw byte stream as a positive integer.
 919  * The function skips buffer's leading zeros, copies the remained data
 920  * to a buffer allocated in the GFP_KERNEL zone and returns
 921  * the address of the new buffer.
 922  *
 923  * @buf   : The data to read
 924  * @nbytes: The amount of data to read
 925  */
 926 static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
 927 {
 928
 929         caam_rsa_drop_leading_zeros(&buf, nbytes);
 930         if (!*nbytes)
 931                 return NULL;
 932
 933         return kmemdup(buf, *nbytes, GFP_KERNEL);
 934 }
 935
 936 static int caam_rsa_check_key_length(unsigned int len)
 937 {
 938         if (len > 4096)
 939                 return -EINVAL;
 940         return 0;
 941 }
 942
 943 static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
 944                                 unsigned int keylen)
 945 {
 946         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
 947         struct rsa_key raw_key = {NULL};
 948         struct caam_rsa_key *rsa_key = &ctx->key;
 949         int ret;
 950
 951         /* Free the old RSA key if any */
 952         caam_rsa_free_key(rsa_key);
 953
 954         ret = rsa_parse_pub_key(&raw_key, key, keylen);
 955         if (ret)
 956                 return ret;
 957
 958         /* Copy key in DMA zone */
 959         rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_KERNEL);
 960         if (!rsa_key->e)
 961                 goto err;
 962
 963         /*
 964          * Skip leading zeros and copy the positive integer to a buffer
 965          * allocated in the GFP_KERNEL zone. The decryption descriptor
 966          * expects a positive integer for the RSA modulus and uses its length as
 967          * decryption output length.
 968          */
 969         rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
 970         if (!rsa_key->n)
 971                 goto err;
 972
 973         if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
 974                 caam_rsa_free_key(rsa_key);
 975                 return -EINVAL;
 976         }
 977
 978         rsa_key->e_sz = raw_key.e_sz;
 979         rsa_key->n_sz = raw_key.n_sz;
 980
 981         return 0;
 982 err:
 983         caam_rsa_free_key(rsa_key);
 984         return -ENOMEM;
 985 }
 986
 987 static int caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx,
 988                                        struct rsa_key *raw_key)
 989 {
 990         struct caam_rsa_key *rsa_key = &ctx->key;
 991         size_t p_sz = raw_key->p_sz;
 992         size_t q_sz = raw_key->q_sz;
 993         unsigned aligned_size;
 994
 995         rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz);
 996         if (!rsa_key->p)
 997                 return -ENOMEM;
 998         rsa_key->p_sz = p_sz;
 999
1000         rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz);
1001         if (!rsa_key->q)
1002                 goto free_p;
1003         rsa_key->q_sz = q_sz;
1004
1005         aligned_size = ALIGN(raw_key->p_sz, dma_get_cache_alignment());
1006         rsa_key->tmp1 = kzalloc(aligned_size, GFP_KERNEL);
1007         if (!rsa_key->tmp1)
1008                 goto free_q;
1009
1010         aligned_size = ALIGN(raw_key->q_sz, dma_get_cache_alignment());
1011         rsa_key->tmp2 = kzalloc(aligned_size, GFP_KERNEL);
1012         if (!rsa_key->tmp2)
1013                 goto free_tmp1;
1014
1015         rsa_key->priv_form = FORM2;
1016
1017         rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz);
1018         if (!rsa_key->dp)
1019                 goto free_tmp2;
1020
1021         rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz);
1022         if (!rsa_key->dq)
1023                 goto free_dp;
1024
1025         rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz,
1026                                           q_sz);
1027         if (!rsa_key->qinv)
1028                 goto free_dq;
1029
1030         rsa_key->priv_form = FORM3;
1031
1032         return 0;
1033
1034 free_dq:
1035         kfree_sensitive(rsa_key->dq);
1036 free_dp:
1037         kfree_sensitive(rsa_key->dp);
1038 free_tmp2:
1039         kfree_sensitive(rsa_key->tmp2);
1040 free_tmp1:
1041         kfree_sensitive(rsa_key->tmp1);
1042 free_q:
1043         kfree_sensitive(rsa_key->q);
1044 free_p:
1045         kfree_sensitive(rsa_key->p);
1046         return -ENOMEM;
1047 }
1048
1049 static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
1050                                  unsigned int keylen)
1051 {
1052         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
1053         struct rsa_key raw_key = {NULL};
1054         struct caam_rsa_key *rsa_key = &ctx->key;
1055         int ret;
1056
1057         /* Free the old RSA key if any */
1058         caam_rsa_free_key(rsa_key);
1059
1060         ret = rsa_parse_priv_key(&raw_key, key, keylen);
1061         if (ret)
1062                 return ret;
1063
1064         /* Copy key in DMA zone */
1065         rsa_key->d = kmemdup(raw_key.d, raw_key.d_sz, GFP_KERNEL);
1066         if (!rsa_key->d)
1067                 goto err;
1068
1069         rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_KERNEL);
1070         if (!rsa_key->e)
1071                 goto err;
1072
1073         /*
1074          * Skip leading zeros and copy the positive integer to a buffer
1075          * allocated in the GFP_KERNEL zone. The decryption descriptor
1076          * expects a positive integer for the RSA modulus and uses its length as
1077          * decryption output length.
1078          */
1079         rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
1080         if (!rsa_key->n)
1081                 goto err;
1082
1083         if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
1084                 caam_rsa_free_key(rsa_key);
1085                 return -EINVAL;
1086         }
1087
1088         rsa_key->d_sz = raw_key.d_sz;
1089         rsa_key->e_sz = raw_key.e_sz;
1090         rsa_key->n_sz = raw_key.n_sz;
1091
1092         ret = caam_rsa_set_priv_key_form(ctx, &raw_key);
1093         if (ret)
1094                 goto err;
1095
1096         return 0;
1097
1098 err:
1099         caam_rsa_free_key(rsa_key);
1100         return -ENOMEM;
1101 }
1102
1103 static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm)
1104 {
1105         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
1106
1107         return ctx->key.n_sz;
1108 }
1109
1110 /* Per session pkc's driver context creation function */
1111 static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
1112 {
1113         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
1114
1115         akcipher_set_reqsize(tfm, sizeof(struct caam_rsa_req_ctx));
1116
1117         ctx->dev = caam_jr_alloc();
1118
1119         if (IS_ERR(ctx->dev)) {
1120                 pr_err("Job Ring Device allocation for transform failed\n");
1121                 return PTR_ERR(ctx->dev);
1122         }
1123
1124         ctx->padding_dma = dma_map_single(ctx->dev, zero_buffer,
1125                                           CAAM_RSA_MAX_INPUT_SIZE - 1,
1126                                           DMA_TO_DEVICE);
1127         if (dma_mapping_error(ctx->dev, ctx->padding_dma)) {
1128                 dev_err(ctx->dev, "unable to map padding\n");
1129                 caam_jr_free(ctx->dev);
1130                 return -ENOMEM;
1131         }
1132
1133         return 0;
1134 }
1135
1136 /* Per session pkc's driver context cleanup function */
1137 static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm)
1138 {
1139         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx_dma(tfm);
1140         struct caam_rsa_key *key = &ctx->key;
1141
1142         dma_unmap_single(ctx->dev, ctx->padding_dma, CAAM_RSA_MAX_INPUT_SIZE -
1143                          1, DMA_TO_DEVICE);
1144         caam_rsa_free_key(key);
1145         caam_jr_free(ctx->dev);
1146 }
1147
1148 static struct caam_akcipher_alg caam_rsa = {
1149         .akcipher.base = {
1150                 .encrypt = caam_rsa_enc,
1151                 .decrypt = caam_rsa_dec,
1152                 .set_pub_key = caam_rsa_set_pub_key,
1153                 .set_priv_key = caam_rsa_set_priv_key,
1154                 .max_size = caam_rsa_max_size,
1155                 .init = caam_rsa_init_tfm,
1156                 .exit = caam_rsa_exit_tfm,
1157                 .base = {
1158                         .cra_name = "rsa",
1159                         .cra_driver_name = "rsa-caam",
1160                         .cra_priority = 3000,
1161                         .cra_module = THIS_MODULE,
1162                         .cra_ctxsize = sizeof(struct caam_rsa_ctx) +
1163                                        CRYPTO_DMA_PADDING,
1164                 },
1165         },
1166         .akcipher.op = {
1167                 .do_one_request = akcipher_do_one_req,
1168         },
1169 };
1170
1171 /* Public Key Cryptography module initialization handler */
1172 int caam_pkc_init(struct device *ctrldev)
1173 {
1174         struct caam_drv_private *priv = dev_get_drvdata(ctrldev);
1175         u32 pk_inst, pkha;
1176         int err;
1177         init_done = false;
1178
1179         /* Determine public key hardware accelerator presence. */
1180         if (priv->era < 10) {
1181                 pk_inst = (rd_reg32(&priv->jr[0]->perfmon.cha_num_ls) &
1182                            CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT;
1183         } else {
1184                 pkha = rd_reg32(&priv->jr[0]->vreg.pkha);
1185                 pk_inst = pkha & CHA_VER_NUM_MASK;
1186
1187                 /*
1188                  * Newer CAAMs support partially disabled functionality. If this is the
1189                  * case, the number is non-zero, but this bit is set to indicate that
1190                  * no encryption or decryption is supported. Only signing and verifying
1191                  * is supported.
1192                  */
1193                 if (pkha & CHA_VER_MISC_PKHA_NO_CRYPT)
1194                         pk_inst = 0;
1195         }
1196
1197         /* Do not register algorithms if PKHA is not present. */
1198         if (!pk_inst)
1199                 return 0;
1200
1201         /* allocate zero buffer, used for padding input */
1202         zero_buffer = kzalloc(CAAM_RSA_MAX_INPUT_SIZE - 1, GFP_KERNEL);
1203         if (!zero_buffer)
1204                 return -ENOMEM;
1205
1206         err = crypto_engine_register_akcipher(&caam_rsa.akcipher);
1207
1208         if (err) {
1209                 kfree(zero_buffer);
1210                 dev_warn(ctrldev, "%s alg registration failed\n",
1211                          caam_rsa.akcipher.base.base.cra_driver_name);
1212         } else {
1213                 init_done = true;
1214                 caam_rsa.registered = true;
1215                 dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n");
1216         }
1217
1218         return err;
1219 }
1220
1221 void caam_pkc_exit(void)
1222 {
1223         if (!init_done)
1224                 return;
1225
1226         if (caam_rsa.registered)
1227                 crypto_engine_unregister_akcipher(&caam_rsa.akcipher);
1228
1229         kfree(zero_buffer);
1230 }