drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sun8i-ce-hash.c - hardware cryptographic offloader for
   4  * Allwinner H3/A64/H5/H2+/H6/R40 SoC
   5  *
   6  * Copyright (C) 2015-2020 Corentin Labbe <clabbe@baylibre.com>
   7  *
   8  * This file add support for MD5 and SHA1/SHA224/SHA256/SHA384/SHA512.
   9  *
  10  * You could find the datasheet in Documentation/arm/sunxi.rst
  11  */
  12 #include <linux/dma-mapping.h>
  13 #include <linux/pm_runtime.h>
  14 #include <linux/scatterlist.h>
  15 #include <crypto/internal/hash.h>
  16 #include <crypto/sha1.h>
  17 #include <crypto/sha2.h>
  18 #include <crypto/md5.h>
  19 #include "sun8i-ce.h"
  20
  21 int sun8i_ce_hash_crainit(struct crypto_tfm *tfm)
  22 {
  23         struct sun8i_ce_hash_tfm_ctx *op = crypto_tfm_ctx(tfm);
  24         struct ahash_alg *alg = __crypto_ahash_alg(tfm->__crt_alg);
  25         struct sun8i_ce_alg_template *algt;
  26         int err;
  27
  28         memset(op, 0, sizeof(struct sun8i_ce_hash_tfm_ctx));
  29
  30         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
  31         op->ce = algt->ce;
  32
  33         op->enginectx.op.do_one_request = sun8i_ce_hash_run;
  34         op->enginectx.op.prepare_request = NULL;
  35         op->enginectx.op.unprepare_request = NULL;
  36
  37         /* FALLBACK */
  38         op->fallback_tfm = crypto_alloc_ahash(crypto_tfm_alg_name(tfm), 0,
  39                                               CRYPTO_ALG_NEED_FALLBACK);
  40         if (IS_ERR(op->fallback_tfm)) {
  41                 dev_err(algt->ce->dev, "Fallback driver could no be loaded\n");
  42                 return PTR_ERR(op->fallback_tfm);
  43         }
  44
  45         if (algt->alg.hash.halg.statesize < crypto_ahash_statesize(op->fallback_tfm))
  46                 algt->alg.hash.halg.statesize = crypto_ahash_statesize(op->fallback_tfm);
  47
  48         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
  49                                  sizeof(struct sun8i_ce_hash_reqctx) +
  50                                  crypto_ahash_reqsize(op->fallback_tfm));
  51
  52         dev_info(op->ce->dev, "Fallback for %s is %s\n",
  53                  crypto_tfm_alg_driver_name(tfm),
  54                  crypto_tfm_alg_driver_name(&op->fallback_tfm->base));
  55         err = pm_runtime_get_sync(op->ce->dev);
  56         if (err < 0)
  57                 goto error_pm;
  58         return 0;
  59 error_pm:
  60         pm_runtime_put_noidle(op->ce->dev);
  61         crypto_free_ahash(op->fallback_tfm);
  62         return err;
  63 }
  64
  65 void sun8i_ce_hash_craexit(struct crypto_tfm *tfm)
  66 {
  67         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_tfm_ctx(tfm);
  68
  69         crypto_free_ahash(tfmctx->fallback_tfm);
  70         pm_runtime_put_sync_suspend(tfmctx->ce->dev);
  71 }
  72
  73 int sun8i_ce_hash_init(struct ahash_request *areq)
  74 {
  75         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
  76         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
  77         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
  78
  79         memset(rctx, 0, sizeof(struct sun8i_ce_hash_reqctx));
  80
  81         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
  82         rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
  83
  84         return crypto_ahash_init(&rctx->fallback_req);
  85 }
  86
  87 int sun8i_ce_hash_export(struct ahash_request *areq, void *out)
  88 {
  89         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
  90         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
  91         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
  92
  93         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
  94         rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
  95
  96         return crypto_ahash_export(&rctx->fallback_req, out);
  97 }
  98
  99 int sun8i_ce_hash_import(struct ahash_request *areq, const void *in)
 100 {
 101         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
 102         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
 103         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
 104
 105         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
 106         rctx->fallback_req.base.flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
 107
 108         return crypto_ahash_import(&rctx->fallback_req, in);
 109 }
 110
 111 int sun8i_ce_hash_final(struct ahash_request *areq)
 112 {
 113         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
 114         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
 115         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
 116 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 117         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
 118         struct sun8i_ce_alg_template *algt;
 119 #endif
 120
 121         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
 122         rctx->fallback_req.base.flags = areq->base.flags &
 123                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 124         rctx->fallback_req.result = areq->result;
 125
 126 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 127         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
 128         algt->stat_fb++;
 129 #endif
 130
 131         return crypto_ahash_final(&rctx->fallback_req);
 132 }
 133
 134 int sun8i_ce_hash_update(struct ahash_request *areq)
 135 {
 136         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
 137         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
 138         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
 139
 140         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
 141         rctx->fallback_req.base.flags = areq->base.flags &
 142                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 143         rctx->fallback_req.nbytes = areq->nbytes;
 144         rctx->fallback_req.src = areq->src;
 145
 146         return crypto_ahash_update(&rctx->fallback_req);
 147 }
 148
 149 int sun8i_ce_hash_finup(struct ahash_request *areq)
 150 {
 151         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
 152         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
 153         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
 154 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 155         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
 156         struct sun8i_ce_alg_template *algt;
 157 #endif
 158
 159         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
 160         rctx->fallback_req.base.flags = areq->base.flags &
 161                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 162
 163         rctx->fallback_req.nbytes = areq->nbytes;
 164         rctx->fallback_req.src = areq->src;
 165         rctx->fallback_req.result = areq->result;
 166 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 167         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
 168         algt->stat_fb++;
 169 #endif
 170
 171         return crypto_ahash_finup(&rctx->fallback_req);
 172 }
 173
 174 static int sun8i_ce_hash_digest_fb(struct ahash_request *areq)
 175 {
 176         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
 177         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
 178         struct sun8i_ce_hash_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
 179 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 180         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
 181         struct sun8i_ce_alg_template *algt;
 182 #endif
 183
 184         ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
 185         rctx->fallback_req.base.flags = areq->base.flags &
 186                                         CRYPTO_TFM_REQ_MAY_SLEEP;
 187
 188         rctx->fallback_req.nbytes = areq->nbytes;
 189         rctx->fallback_req.src = areq->src;
 190         rctx->fallback_req.result = areq->result;
 191 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 192         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
 193         algt->stat_fb++;
 194 #endif
 195
 196         return crypto_ahash_digest(&rctx->fallback_req);
 197 }
 198
 199 static bool sun8i_ce_hash_need_fallback(struct ahash_request *areq)
 200 {
 201         struct scatterlist *sg;
 202
 203         if (areq->nbytes == 0)
 204                 return true;
 205         /* we need to reserve one SG for padding one */
 206         if (sg_nents(areq->src) > MAX_SG - 1)
 207                 return true;
 208         sg = areq->src;
 209         while (sg) {
 210                 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
 211                         return true;
 212                 sg = sg_next(sg);
 213         }
 214         return false;
 215 }
 216
 217 int sun8i_ce_hash_digest(struct ahash_request *areq)
 218 {
 219         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
 220         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
 221         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
 222         struct sun8i_ce_alg_template *algt;
 223         struct sun8i_ce_dev *ce;
 224         struct crypto_engine *engine;
 225         struct scatterlist *sg;
 226         int nr_sgs, e, i;
 227
 228         if (sun8i_ce_hash_need_fallback(areq))
 229                 return sun8i_ce_hash_digest_fb(areq);
 230
 231         nr_sgs = sg_nents(areq->src);
 232         if (nr_sgs > MAX_SG - 1)
 233                 return sun8i_ce_hash_digest_fb(areq);
 234
 235         for_each_sg(areq->src, sg, nr_sgs, i) {
 236                 if (sg->length % 4 || !IS_ALIGNED(sg->offset, sizeof(u32)))
 237                         return sun8i_ce_hash_digest_fb(areq);
 238         }
 239
 240         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
 241         ce = algt->ce;
 242
 243         e = sun8i_ce_get_engine_number(ce);
 244         rctx->flow = e;
 245         engine = ce->chanlist[e].engine;
 246
 247         return crypto_transfer_hash_request_to_engine(engine, areq);
 248 }
 249
 250 int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
 251 {
 252         struct ahash_request *areq = container_of(breq, struct ahash_request, base);
 253         struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
 254         struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
 255         struct sun8i_ce_hash_reqctx *rctx = ahash_request_ctx(areq);
 256         struct sun8i_ce_alg_template *algt;
 257         struct sun8i_ce_dev *ce;
 258         struct sun8i_ce_flow *chan;
 259         struct ce_task *cet;
 260         struct scatterlist *sg;
 261         int nr_sgs, flow, err;
 262         unsigned int len;
 263         u32 common;
 264         u64 byte_count;
 265         __le32 *bf;
 266         void *buf = NULL;
 267         int j, i, todo;
 268         int nbw = 0;
 269         u64 fill, min_fill;
 270         __be64 *bebits;
 271         __le64 *lebits;
 272         void *result = NULL;
 273         u64 bs;
 274         int digestsize;
 275         dma_addr_t addr_res, addr_pad;
 276
 277         algt = container_of(alg, struct sun8i_ce_alg_template, alg.hash);
 278         ce = algt->ce;
 279
 280         bs = algt->alg.hash.halg.base.cra_blocksize;
 281         digestsize = algt->alg.hash.halg.digestsize;
 282         if (digestsize == SHA224_DIGEST_SIZE)
 283                 digestsize = SHA256_DIGEST_SIZE;
 284         if (digestsize == SHA384_DIGEST_SIZE)
 285                 digestsize = SHA512_DIGEST_SIZE;
 286
 287         /* the padding could be up to two block. */
 288         buf = kzalloc(bs * 2, GFP_KERNEL | GFP_DMA);
 289         if (!buf) {
 290                 err = -ENOMEM;
 291                 goto theend;
 292         }
 293         bf = (__le32 *)buf;
 294
 295         result = kzalloc(digestsize, GFP_KERNEL | GFP_DMA);
 296         if (!result) {
 297                 err = -ENOMEM;
 298                 goto theend;
 299         }
 300
 301         flow = rctx->flow;
 302         chan = &ce->chanlist[flow];
 303
 304 #ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG
 305         algt->stat_req++;
 306 #endif
 307         dev_dbg(ce->dev, "%s %s len=%d\n", __func__, crypto_tfm_alg_name(areq->base.tfm), areq->nbytes);
 308
 309         cet = chan->tl;
 310         memset(cet, 0, sizeof(struct ce_task));
 311
 312         cet->t_id = cpu_to_le32(flow);
 313         common = ce->variant->alg_hash[algt->ce_algo_id];
 314         common |= CE_COMM_INT;
 315         cet->t_common_ctl = cpu_to_le32(common);
 316
 317         cet->t_sym_ctl = 0;
 318         cet->t_asym_ctl = 0;
 319
 320         nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src), DMA_TO_DEVICE);
 321         if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
 322                 dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
 323                 err = -EINVAL;
 324                 goto theend;
 325         }
 326
 327         len = areq->nbytes;
 328         for_each_sg(areq->src, sg, nr_sgs, i) {
 329                 cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg));
 330                 todo = min(len, sg_dma_len(sg));
 331                 cet->t_src[i].len = cpu_to_le32(todo / 4);
 332                 len -= todo;
 333         }
 334         if (len > 0) {
 335                 dev_err(ce->dev, "remaining len %d\n", len);
 336                 err = -EINVAL;
 337                 goto theend;
 338         }
 339         addr_res = dma_map_single(ce->dev, result, digestsize, DMA_FROM_DEVICE);
 340         cet->t_dst[0].addr = cpu_to_le32(addr_res);
 341         cet->t_dst[0].len = cpu_to_le32(digestsize / 4);
 342         if (dma_mapping_error(ce->dev, addr_res)) {
 343                 dev_err(ce->dev, "DMA map dest\n");
 344                 err = -EINVAL;
 345                 goto theend;
 346         }
 347
 348         byte_count = areq->nbytes;
 349         j = 0;
 350         bf[j++] = cpu_to_le32(0x80);
 351
 352         if (bs == 64) {
 353                 fill = 64 - (byte_count % 64);
 354                 min_fill = 2 * sizeof(u32) + (nbw ? 0 : sizeof(u32));
 355         } else {
 356                 fill = 128 - (byte_count % 128);
 357                 min_fill = 4 * sizeof(u32) + (nbw ? 0 : sizeof(u32));
 358         }
 359
 360         if (fill < min_fill)
 361                 fill += bs;
 362
 363         j += (fill - min_fill) / sizeof(u32);
 364
 365         switch (algt->ce_algo_id) {
 366         case CE_ID_HASH_MD5:
 367                 lebits = (__le64 *)&bf[j];
 368                 *lebits = cpu_to_le64(byte_count << 3);
 369                 j += 2;
 370                 break;
 371         case CE_ID_HASH_SHA1:
 372         case CE_ID_HASH_SHA224:
 373         case CE_ID_HASH_SHA256:
 374                 bebits = (__be64 *)&bf[j];
 375                 *bebits = cpu_to_be64(byte_count << 3);
 376                 j += 2;
 377                 break;
 378         case CE_ID_HASH_SHA384:
 379         case CE_ID_HASH_SHA512:
 380                 bebits = (__be64 *)&bf[j];
 381                 *bebits = cpu_to_be64(byte_count >> 61);
 382                 j += 2;
 383                 bebits = (__be64 *)&bf[j];
 384                 *bebits = cpu_to_be64(byte_count << 3);
 385                 j += 2;
 386                 break;
 387         }
 388
 389         addr_pad = dma_map_single(ce->dev, buf, j * 4, DMA_TO_DEVICE);
 390         cet->t_src[i].addr = cpu_to_le32(addr_pad);
 391         cet->t_src[i].len = cpu_to_le32(j);
 392         if (dma_mapping_error(ce->dev, addr_pad)) {
 393                 dev_err(ce->dev, "DMA error on padding SG\n");
 394                 err = -EINVAL;
 395                 goto theend;
 396         }
 397
 398         if (ce->variant->hash_t_dlen_in_bits)
 399                 cet->t_dlen = cpu_to_le32((areq->nbytes + j * 4) * 8);
 400         else
 401                 cet->t_dlen = cpu_to_le32(areq->nbytes / 4 + j);
 402
 403         chan->timeout = areq->nbytes;
 404
 405         err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(areq->base.tfm));
 406
 407         dma_unmap_single(ce->dev, addr_pad, j * 4, DMA_TO_DEVICE);
 408         dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE);
 409         dma_unmap_single(ce->dev, addr_res, digestsize, DMA_FROM_DEVICE);
 410
 411
 412         memcpy(areq->result, result, algt->alg.hash.halg.digestsize);
 413 theend:
 414         kfree(buf);
 415         kfree(result);
 416         crypto_finalize_hash_request(engine, breq, err);
 417         return 0;
 418 }