drivers/crypto/bcm/util.c

   1 /*
   2  * Copyright 2016 Broadcom
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 2, as
   6  * published by the Free Software Foundation (the "GPL").
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License version 2 (GPLv2) for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * version 2 (GPLv2) along with this source code.
  15  */
  16
  17 #include <linux/debugfs.h>
  18
  19 #include "cipher.h"
  20 #include "util.h"
  21
  22 /* offset of SPU_OFIFO_CTRL register */
  23 #define SPU_OFIFO_CTRL      0x40
  24 #define SPU_FIFO_WATERMARK  0x1FF
  25
  26 /**
  27  * spu_sg_at_offset() - Find the scatterlist entry at a given distance from the
  28  * start of a scatterlist.
  29  * @sg:         [in]  Start of a scatterlist
  30  * @skip:       [in]  Distance from the start of the scatterlist, in bytes
  31  * @sge:        [out] Scatterlist entry at skip bytes from start
  32  * @sge_offset: [out] Number of bytes from start of sge buffer to get to
  33  *                    requested distance.
  34  *
  35  * Return: 0 if entry found at requested distance
  36  *         < 0 otherwise
  37  */
  38 int spu_sg_at_offset(struct scatterlist *sg, unsigned int skip,
  39                      struct scatterlist **sge, unsigned int *sge_offset)
  40 {
  41         /* byte index from start of sg to the end of the previous entry */
  42         unsigned int index = 0;
  43         /* byte index from start of sg to the end of the current entry */
  44         unsigned int next_index;
  45
  46         next_index = sg->length;
  47         while (next_index <= skip) {
  48                 sg = sg_next(sg);
  49                 index = next_index;
  50                 if (!sg)
  51                         return -EINVAL;
  52                 next_index += sg->length;
  53         }
  54
  55         *sge_offset = skip - index;
  56         *sge = sg;
  57         return 0;
  58 }
  59
  60 /* Copy len bytes of sg data, starting at offset skip, to a dest buffer */
  61 void sg_copy_part_to_buf(struct scatterlist *src, u8 *dest,
  62                          unsigned int len, unsigned int skip)
  63 {
  64         size_t copied;
  65         unsigned int nents = sg_nents(src);
  66
  67         copied = sg_pcopy_to_buffer(src, nents, dest, len, skip);
  68         if (copied != len) {
  69                 flow_log("%s copied %u bytes of %u requested. ",
  70                          __func__, (u32)copied, len);
  71                 flow_log("sg with %u entries and skip %u\n", nents, skip);
  72         }
  73 }
  74
  75 /*
  76  * Copy data into a scatterlist starting at a specified offset in the
  77  * scatterlist. Specifically, copy len bytes of data in the buffer src
  78  * into the scatterlist dest, starting skip bytes into the scatterlist.
  79  */
  80 void sg_copy_part_from_buf(struct scatterlist *dest, u8 *src,
  81                            unsigned int len, unsigned int skip)
  82 {
  83         size_t copied;
  84         unsigned int nents = sg_nents(dest);
  85
  86         copied = sg_pcopy_from_buffer(dest, nents, src, len, skip);
  87         if (copied != len) {
  88                 flow_log("%s copied %u bytes of %u requested. ",
  89                          __func__, (u32)copied, len);
  90                 flow_log("sg with %u entries and skip %u\n", nents, skip);
  91         }
  92 }
  93
  94 /**
  95  * spu_sg_count() - Determine number of elements in scatterlist to provide a
  96  * specified number of bytes.
  97  * @sg_list:  scatterlist to examine
  98  * @skip:     index of starting point
  99  * @nbytes:   consider elements of scatterlist until reaching this number of
 100  *            bytes
 101  *
 102  * Return: the number of sg entries contributing to nbytes of data
 103  */
 104 int spu_sg_count(struct scatterlist *sg_list, unsigned int skip, int nbytes)
 105 {
 106         struct scatterlist *sg;
 107         int sg_nents = 0;
 108         unsigned int offset;
 109
 110         if (!sg_list)
 111                 return 0;
 112
 113         if (spu_sg_at_offset(sg_list, skip, &sg, &offset) < 0)
 114                 return 0;
 115
 116         while (sg && (nbytes > 0)) {
 117                 sg_nents++;
 118                 nbytes -= (sg->length - offset);
 119                 offset = 0;
 120                 sg = sg_next(sg);
 121         }
 122         return sg_nents;
 123 }
 124
 125 /**
 126  * spu_msg_sg_add() - Copy scatterlist entries from one sg to another, up to a
 127  * given length.
 128  * @to_sg:       scatterlist to copy to
 129  * @from_sg:     scatterlist to copy from
 130  * @from_skip:   number of bytes to skip in from_sg. Non-zero when previous
 131  *               request included part of the buffer in entry in from_sg.
 132  *               Assumes from_skip < from_sg->length.
 133  * @from_nents   number of entries in from_sg
 134  * @length       number of bytes to copy. may reach this limit before exhausting
 135  *               from_sg.
 136  *
 137  * Copies the entries themselves, not the data in the entries. Assumes to_sg has
 138  * enough entries. Does not limit the size of an individual buffer in to_sg.
 139  *
 140  * to_sg, from_sg, skip are all updated to end of copy
 141  *
 142  * Return: Number of bytes copied
 143  */
 144 u32 spu_msg_sg_add(struct scatterlist **to_sg,
 145                    struct scatterlist **from_sg, u32 *from_skip,
 146                    u8 from_nents, u32 length)
 147 {
 148         struct scatterlist *sg; /* an entry in from_sg */
 149         struct scatterlist *to = *to_sg;
 150         struct scatterlist *from = *from_sg;
 151         u32 skip = *from_skip;
 152         u32 offset;
 153         int i;
 154         u32 entry_len = 0;
 155         u32 frag_len = 0;       /* length of entry added to to_sg */
 156         u32 copied = 0;         /* number of bytes copied so far */
 157
 158         if (length == 0)
 159                 return 0;
 160
 161         for_each_sg(from, sg, from_nents, i) {
 162                 /* number of bytes in this from entry not yet used */
 163                 entry_len = sg->length - skip;
 164                 frag_len = min(entry_len, length - copied);
 165                 offset = sg->offset + skip;
 166                 if (frag_len)
 167                         sg_set_page(to++, sg_page(sg), frag_len, offset);
 168                 copied += frag_len;
 169                 if (copied == entry_len) {
 170                         /* used up all of from entry */
 171                         skip = 0;       /* start at beginning of next entry */
 172                 }
 173                 if (copied == length)
 174                         break;
 175         }
 176         *to_sg = to;
 177         *from_sg = sg;
 178         if (frag_len < entry_len)
 179                 *from_skip = skip + frag_len;
 180         else
 181                 *from_skip = 0;
 182
 183         return copied;
 184 }
 185
 186 void add_to_ctr(u8 *ctr_pos, unsigned int increment)
 187 {
 188         __be64 *high_be = (__be64 *)ctr_pos;
 189         __be64 *low_be = high_be + 1;
 190         u64 orig_low = __be64_to_cpu(*low_be);
 191         u64 new_low = orig_low + (u64)increment;
 192
 193         *low_be = __cpu_to_be64(new_low);
 194         if (new_low < orig_low)
 195                 /* there was a carry from the low 8 bytes */
 196                 *high_be = __cpu_to_be64(__be64_to_cpu(*high_be) + 1);
 197 }
 198
 199 struct sdesc {
 200         struct shash_desc shash;
 201         char ctx[];
 202 };
 203
 204 /**
 205  * do_shash() - Do a synchronous hash operation in software
 206  * @name:       The name of the hash algorithm
 207  * @result:     Buffer where digest is to be written
 208  * @data1:      First part of data to hash. May be NULL.
 209  * @data1_len:  Length of data1, in bytes
 210  * @data2:      Second part of data to hash. May be NULL.
 211  * @data2_len:  Length of data2, in bytes
 212  * @key:        Key (if keyed hash)
 213  * @key_len:    Length of key, in bytes (or 0 if non-keyed hash)
 214  *
 215  * Note that the crypto API will not select this driver's own transform because
 216  * this driver only registers asynchronous algos.
 217  *
 218  * Return: 0 if hash successfully stored in result
 219  *         < 0 otherwise
 220  */
 221 int do_shash(unsigned char *name, unsigned char *result,
 222              const u8 *data1, unsigned int data1_len,
 223              const u8 *data2, unsigned int data2_len,
 224              const u8 *key, unsigned int key_len)
 225 {
 226         int rc;
 227         unsigned int size;
 228         struct crypto_shash *hash;
 229         struct sdesc *sdesc;
 230
 231         hash = crypto_alloc_shash(name, 0, 0);
 232         if (IS_ERR(hash)) {
 233                 rc = PTR_ERR(hash);
 234                 pr_err("%s: Crypto %s allocation error %d\n", __func__, name, rc);
 235                 return rc;
 236         }
 237
 238         size = sizeof(struct shash_desc) + crypto_shash_descsize(hash);
 239         sdesc = kmalloc(size, GFP_KERNEL);
 240         if (!sdesc) {
 241                 rc = -ENOMEM;
 242                 goto do_shash_err;
 243         }
 244         sdesc->shash.tfm = hash;
 245         sdesc->shash.flags = 0x0;
 246
 247         if (key_len > 0) {
 248                 rc = crypto_shash_setkey(hash, key, key_len);
 249                 if (rc) {
 250                         pr_err("%s: Could not setkey %s shash\n", __func__, name);
 251                         goto do_shash_err;
 252                 }
 253         }
 254
 255         rc = crypto_shash_init(&sdesc->shash);
 256         if (rc) {
 257                 pr_err("%s: Could not init %s shash\n", __func__, name);
 258                 goto do_shash_err;
 259         }
 260         rc = crypto_shash_update(&sdesc->shash, data1, data1_len);
 261         if (rc) {
 262                 pr_err("%s: Could not update1\n", __func__);
 263                 goto do_shash_err;
 264         }
 265         if (data2 && data2_len) {
 266                 rc = crypto_shash_update(&sdesc->shash, data2, data2_len);
 267                 if (rc) {
 268                         pr_err("%s: Could not update2\n", __func__);
 269                         goto do_shash_err;
 270                 }
 271         }
 272         rc = crypto_shash_final(&sdesc->shash, result);
 273         if (rc)
 274                 pr_err("%s: Could not generate %s hash\n", __func__, name);
 275
 276 do_shash_err:
 277         crypto_free_shash(hash);
 278         kfree(sdesc);
 279
 280         return rc;
 281 }
 282
 283 /* Dump len bytes of a scatterlist starting at skip bytes into the sg */
 284 void __dump_sg(struct scatterlist *sg, unsigned int skip, unsigned int len)
 285 {
 286         u8 dbuf[16];
 287         unsigned int idx = skip;
 288         unsigned int num_out = 0;       /* number of bytes dumped so far */
 289         unsigned int count;
 290
 291         if (packet_debug_logging) {
 292                 while (num_out < len) {
 293                         count = (len - num_out > 16) ? 16 : len - num_out;
 294                         sg_copy_part_to_buf(sg, dbuf, count, idx);
 295                         num_out += count;
 296                         print_hex_dump(KERN_ALERT, "  sg: ", DUMP_PREFIX_NONE,
 297                                        4, 1, dbuf, count, false);
 298                         idx += 16;
 299                 }
 300         }
 301         if (debug_logging_sleep)
 302                 msleep(debug_logging_sleep);
 303 }
 304
 305 /* Returns the name for a given cipher alg/mode */
 306 char *spu_alg_name(enum spu_cipher_alg alg, enum spu_cipher_mode mode)
 307 {
 308         switch (alg) {
 309         case CIPHER_ALG_RC4:
 310                 return "rc4";
 311         case CIPHER_ALG_AES:
 312                 switch (mode) {
 313                 case CIPHER_MODE_CBC:
 314                         return "cbc(aes)";
 315                 case CIPHER_MODE_ECB:
 316                         return "ecb(aes)";
 317                 case CIPHER_MODE_OFB:
 318                         return "ofb(aes)";
 319                 case CIPHER_MODE_CFB:
 320                         return "cfb(aes)";
 321                 case CIPHER_MODE_CTR:
 322                         return "ctr(aes)";
 323                 case CIPHER_MODE_XTS:
 324                         return "xts(aes)";
 325                 case CIPHER_MODE_GCM:
 326                         return "gcm(aes)";
 327                 default:
 328                         return "aes";
 329                 }
 330                 break;
 331         case CIPHER_ALG_DES:
 332                 switch (mode) {
 333                 case CIPHER_MODE_CBC:
 334                         return "cbc(des)";
 335                 case CIPHER_MODE_ECB:
 336                         return "ecb(des)";
 337                 case CIPHER_MODE_CTR:
 338                         return "ctr(des)";
 339                 default:
 340                         return "des";
 341                 }
 342                 break;
 343         case CIPHER_ALG_3DES:
 344                 switch (mode) {
 345                 case CIPHER_MODE_CBC:
 346                         return "cbc(des3_ede)";
 347                 case CIPHER_MODE_ECB:
 348                         return "ecb(des3_ede)";
 349                 case CIPHER_MODE_CTR:
 350                         return "ctr(des3_ede)";
 351                 default:
 352                         return "3des";
 353                 }
 354                 break;
 355         default:
 356                 return "other";
 357         }
 358 }
 359
 360 static ssize_t spu_debugfs_read(struct file *filp, char __user *ubuf,
 361                                 size_t count, loff_t *offp)
 362 {
 363         struct device_private *ipriv;
 364         char *buf;
 365         ssize_t ret, out_offset, out_count;
 366         int i;
 367         u32 fifo_len;
 368         u32 spu_ofifo_ctrl;
 369         u32 alg;
 370         u32 mode;
 371         u32 op_cnt;
 372
 373         out_count = 2048;
 374
 375         buf = kmalloc(out_count, GFP_KERNEL);
 376         if (!buf)
 377                 return -ENOMEM;
 378
 379         ipriv = filp->private_data;
 380         out_offset = 0;
 381         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 382                                "Number of SPUs.........%u\n",
 383                                ipriv->spu.num_spu);
 384         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 385                                "Current sessions.......%u\n",
 386                                atomic_read(&ipriv->session_count));
 387         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 388                                "Session count..........%u\n",
 389                                atomic_read(&ipriv->stream_count));
 390         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 391                                "Cipher setkey..........%u\n",
 392                                atomic_read(&ipriv->setkey_cnt[SPU_OP_CIPHER]));
 393         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 394                                "Cipher Ops.............%u\n",
 395                                atomic_read(&ipriv->op_counts[SPU_OP_CIPHER]));
 396         for (alg = 0; alg < CIPHER_ALG_LAST; alg++) {
 397                 for (mode = 0; mode < CIPHER_MODE_LAST; mode++) {
 398                         op_cnt = atomic_read(&ipriv->cipher_cnt[alg][mode]);
 399                         if (op_cnt) {
 400                                 out_offset += snprintf(buf + out_offset,
 401                                                        out_count - out_offset,
 402                                "  %-13s%11u\n",
 403                                spu_alg_name(alg, mode), op_cnt);
 404                         }
 405                 }
 406         }
 407         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 408                                "Hash Ops...............%u\n",
 409                                atomic_read(&ipriv->op_counts[SPU_OP_HASH]));
 410         for (alg = 0; alg < HASH_ALG_LAST; alg++) {
 411                 op_cnt = atomic_read(&ipriv->hash_cnt[alg]);
 412                 if (op_cnt) {
 413                         out_offset += snprintf(buf + out_offset,
 414                                                out_count - out_offset,
 415                        "  %-13s%11u\n",
 416                        hash_alg_name[alg], op_cnt);
 417                 }
 418         }
 419         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 420                                "HMAC setkey............%u\n",
 421                                atomic_read(&ipriv->setkey_cnt[SPU_OP_HMAC]));
 422         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 423                                "HMAC Ops...............%u\n",
 424                                atomic_read(&ipriv->op_counts[SPU_OP_HMAC]));
 425         for (alg = 0; alg < HASH_ALG_LAST; alg++) {
 426                 op_cnt = atomic_read(&ipriv->hmac_cnt[alg]);
 427                 if (op_cnt) {
 428                         out_offset += snprintf(buf + out_offset,
 429                                                out_count - out_offset,
 430                        "  %-13s%11u\n",
 431                        hash_alg_name[alg], op_cnt);
 432                 }
 433         }
 434         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 435                                "AEAD setkey............%u\n",
 436                                atomic_read(&ipriv->setkey_cnt[SPU_OP_AEAD]));
 437
 438         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 439                                "AEAD Ops...............%u\n",
 440                                atomic_read(&ipriv->op_counts[SPU_OP_AEAD]));
 441         for (alg = 0; alg < AEAD_TYPE_LAST; alg++) {
 442                 op_cnt = atomic_read(&ipriv->aead_cnt[alg]);
 443                 if (op_cnt) {
 444                         out_offset += snprintf(buf + out_offset,
 445                                                out_count - out_offset,
 446                        "  %-13s%11u\n",
 447                        aead_alg_name[alg], op_cnt);
 448                 }
 449         }
 450         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 451                                "Bytes of req data......%llu\n",
 452                                (u64)atomic64_read(&ipriv->bytes_out));
 453         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 454                                "Bytes of resp data.....%llu\n",
 455                                (u64)atomic64_read(&ipriv->bytes_in));
 456         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 457                                "Mailbox full...........%u\n",
 458                                atomic_read(&ipriv->mb_no_spc));
 459         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 460                                "Mailbox send failures..%u\n",
 461                                atomic_read(&ipriv->mb_send_fail));
 462         out_offset += snprintf(buf + out_offset, out_count - out_offset,
 463                                "Check ICV errors.......%u\n",
 464                                atomic_read(&ipriv->bad_icv));
 465         if (ipriv->spu.spu_type == SPU_TYPE_SPUM)
 466                 for (i = 0; i < ipriv->spu.num_spu; i++) {
 467                         spu_ofifo_ctrl = ioread32(ipriv->spu.reg_vbase[i] +
 468                                                   SPU_OFIFO_CTRL);
 469                         fifo_len = spu_ofifo_ctrl & SPU_FIFO_WATERMARK;
 470                         out_offset += snprintf(buf + out_offset,
 471                                                out_count - out_offset,
 472                                        "SPU %d output FIFO high water.....%u\n",
 473                                        i, fifo_len);
 474                 }
 475
 476         if (out_offset > out_count)
 477                 out_offset = out_count;
 478
 479         ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
 480         kfree(buf);
 481         return ret;
 482 }
 483
 484 static const struct file_operations spu_debugfs_stats = {
 485         .owner = THIS_MODULE,
 486         .open = simple_open,
 487         .read = spu_debugfs_read,
 488 };
 489
 490 /*
 491  * Create the debug FS directories. If the top-level directory has not yet
 492  * been created, create it now. Create a stats file in this directory for
 493  * a SPU.
 494  */
 495 void spu_setup_debugfs(void)
 496 {
 497         if (!debugfs_initialized())
 498                 return;
 499
 500         if (!iproc_priv.debugfs_dir)
 501                 iproc_priv.debugfs_dir = debugfs_create_dir(KBUILD_MODNAME,
 502                                                             NULL);
 503
 504         if (!iproc_priv.debugfs_stats)
 505                 /* Create file with permissions S_IRUSR */
 506                 debugfs_create_file("stats", 0400, iproc_priv.debugfs_dir,
 507                                     &iproc_priv, &spu_debugfs_stats);
 508 }
 509
 510 void spu_free_debugfs(void)
 511 {
 512         debugfs_remove_recursive(iproc_priv.debugfs_dir);
 513         iproc_priv.debugfs_dir = NULL;
 514 }
 515
 516 /**
 517  * format_value_ccm() - Format a value into a buffer, using a specified number
 518  *                      of bytes (i.e. maybe writing value X into a 4 byte
 519  *                      buffer, or maybe into a 12 byte buffer), as per the
 520  *                      SPU CCM spec.
 521  *
 522  * @val:                value to write (up to max of unsigned int)
 523  * @buf:                (pointer to) buffer to write the value
 524  * @len:                number of bytes to use (0 to 255)
 525  *
 526  */
 527 void format_value_ccm(unsigned int val, u8 *buf, u8 len)
 528 {
 529         int i;
 530
 531         /* First clear full output buffer */
 532         memset(buf, 0, len);
 533
 534         /* Then, starting from right side, fill in with data */
 535         for (i = 0; i < len; i++) {
 536                 buf[len - i - 1] = (val >> (8 * i)) & 0xff;
 537                 if (i >= 3)
 538                         break;  /* Only handle up to 32 bits of 'val' */
 539         }
 540 }