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 */
  36static u8 *zero_buffer;
  37
  38/*
  39 * variable used to avoid double free of resources in case
  40 * algorithm registration was unsuccessful
  41 */
  42static bool init_done;
  43
  44struct caam_akcipher_alg {
  45	struct akcipher_engine_alg akcipher;
  46	bool registered;
  47};
  48
  49static 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
  62static 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
  74static 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
  86static 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
 103static 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 */
 123static 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
 152static 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 */
 203static 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
 249static 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
 365sec4_sg_fail:
 366	kfree(edesc);
 367dst_fail:
 368	dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
 369src_fail:
 370	dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
 371	return ERR_PTR(-ENOMEM);
 372}
 373
 374static 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
 404static 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
 450static 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
 497static 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
 562unmap_tmp1:
 563	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 564unmap_q:
 565	dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 566unmap_p:
 567	dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 568unmap_d:
 569	dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
 570
 571	return -ENOMEM;
 572}
 573
 574static 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
 651unmap_tmp1:
 652	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 653unmap_qinv:
 654	dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
 655unmap_dq:
 656	dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
 657unmap_dp:
 658	dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
 659unmap_q:
 660	dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 661unmap_p:
 662	dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 663
 664	return -ENOMEM;
 665}
 666
 667static 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
 714static 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
 747init_fail:
 748	rsa_io_unmap(jrdev, edesc, req);
 749	kfree(edesc);
 750	return ret;
 751}
 752
 753static 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
 776init_fail:
 777	rsa_io_unmap(jrdev, edesc, req);
 778	kfree(edesc);
 779	return ret;
 780}
 781
 782static 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
 805init_fail:
 806	rsa_io_unmap(jrdev, edesc, req);
 807	kfree(edesc);
 808	return ret;
 809}
 810
 811static 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
 834init_fail:
 835	rsa_io_unmap(jrdev, edesc, req);
 836	kfree(edesc);
 837	return ret;
 838}
 839
 840static 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
 866static 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
 881static 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 */
 900static 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 */
 926static 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
 936static int caam_rsa_check_key_length(unsigned int len)
 937{
 938	if (len > 4096)
 939		return -EINVAL;
 940	return 0;
 941}
 942
 943static 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;
 982err:
 983	caam_rsa_free_key(rsa_key);
 984	return -ENOMEM;
 985}
 986
 987static 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
1034free_dq:
1035	kfree_sensitive(rsa_key->dq);
1036free_dp:
1037	kfree_sensitive(rsa_key->dp);
1038free_tmp2:
1039	kfree_sensitive(rsa_key->tmp2);
1040free_tmp1:
1041	kfree_sensitive(rsa_key->tmp1);
1042free_q:
1043	kfree_sensitive(rsa_key->q);
1044free_p:
1045	kfree_sensitive(rsa_key->p);
1046	return -ENOMEM;
1047}
1048
1049static 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
1098err:
1099	caam_rsa_free_key(rsa_key);
1100	return -ENOMEM;
1101}
1102
1103static 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 */
1111static 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 */
1137static 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
1148static 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 */
1172int 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
1221void 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}