1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Routines supporting the Power 7+ Nest Accelerators driver 4 * 5 * Copyright (C) 2011-2012 International Business Machines Inc. 6 * 7 * Author: Kent Yoder <yoder1@us.ibm.com> 8 */ 9 10 #include <crypto/internal/aead.h> 11 #include <crypto/internal/hash.h> 12 #include <crypto/aes.h> 13 #include <crypto/sha2.h> 14 #include <crypto/algapi.h> 15 #include <crypto/scatterwalk.h> 16 #include <linux/module.h> 17 #include <linux/moduleparam.h> 18 #include <linux/types.h> 19 #include <linux/mm.h> 20 #include <linux/scatterlist.h> 21 #include <linux/device.h> 22 #include <linux/of.h> 23 #include <asm/hvcall.h> 24 #include <asm/vio.h> 25 26 #include "nx_csbcpb.h" 27 #include "nx.h" 28 29 30 /** 31 * nx_hcall_sync - make an H_COP_OP hcall for the passed in op structure 32 * 33 * @nx_ctx: the crypto context handle 34 * @op: PFO operation struct to pass in 35 * @may_sleep: flag indicating the request can sleep 36 * 37 * Make the hcall, retrying while the hardware is busy. If we cannot yield 38 * the thread, limit the number of retries to 10 here. 39 */ 40 int nx_hcall_sync(struct nx_crypto_ctx *nx_ctx, 41 struct vio_pfo_op *op, 42 u32 may_sleep) 43 { 44 int rc, retries = 10; 45 struct vio_dev *viodev = nx_driver.viodev; 46 47 atomic_inc(&(nx_ctx->stats->sync_ops)); 48 49 do { 50 rc = vio_h_cop_sync(viodev, op); 51 } while (rc == -EBUSY && !may_sleep && retries--); 52 53 if (rc) { 54 dev_dbg(&viodev->dev, "vio_h_cop_sync failed: rc: %d " 55 "hcall rc: %ld\n", rc, op->hcall_err); 56 atomic_inc(&(nx_ctx->stats->errors)); 57 atomic_set(&(nx_ctx->stats->last_error), op->hcall_err); 58 atomic_set(&(nx_ctx->stats->last_error_pid), current->pid); 59 } 60 61 return rc; 62 } 63 64 /** 65 * nx_build_sg_list - build an NX scatter list describing a single buffer 66 * 67 * @sg_head: pointer to the first scatter list element to build 68 * @start_addr: pointer to the linear buffer 69 * @len: length of the data at @start_addr 70 * @sgmax: the largest number of scatter list elements we're allowed to create 71 * 72 * This function will start writing nx_sg elements at @sg_head and keep 73 * writing them until all of the data from @start_addr is described or 74 * until sgmax elements have been written. Scatter list elements will be 75 * created such that none of the elements describes a buffer that crosses a 4K 76 * boundary. 77 */ 78 struct nx_sg *nx_build_sg_list(struct nx_sg *sg_head, 79 u8 *start_addr, 80 unsigned int *len, 81 u32 sgmax) 82 { 83 unsigned int sg_len = 0; 84 struct nx_sg *sg; 85 u64 sg_addr = (u64)start_addr; 86 u64 end_addr; 87 88 /* determine the start and end for this address range - slightly 89 * different if this is in VMALLOC_REGION */ 90 if (is_vmalloc_addr(start_addr)) 91 sg_addr = page_to_phys(vmalloc_to_page(start_addr)) 92 + offset_in_page(sg_addr); 93 else 94 sg_addr = __pa(sg_addr); 95 96 end_addr = sg_addr + *len; 97 98 /* each iteration will write one struct nx_sg element and add the 99 * length of data described by that element to sg_len. Once @len bytes 100 * have been described (or @sgmax elements have been written), the 101 * loop ends. min_t is used to ensure @end_addr falls on the same page 102 * as sg_addr, if not, we need to create another nx_sg element for the 103 * data on the next page. 104 * 105 * Also when using vmalloc'ed data, every time that a system page 106 * boundary is crossed the physical address needs to be re-calculated. 107 */ 108 for (sg = sg_head; sg_len < *len; sg++) { 109 u64 next_page; 110 111 sg->addr = sg_addr; 112 sg_addr = min_t(u64, NX_PAGE_NUM(sg_addr + NX_PAGE_SIZE), 113 end_addr); 114 115 next_page = (sg->addr & PAGE_MASK) + PAGE_SIZE; 116 sg->len = min_t(u64, sg_addr, next_page) - sg->addr; 117 sg_len += sg->len; 118 119 if (sg_addr >= next_page && 120 is_vmalloc_addr(start_addr + sg_len)) { 121 sg_addr = page_to_phys(vmalloc_to_page( 122 start_addr + sg_len)); 123 end_addr = sg_addr + *len - sg_len; 124 } 125 126 if ((sg - sg_head) == sgmax) { 127 pr_err("nx: scatter/gather list overflow, pid: %d\n", 128 current->pid); 129 sg++; 130 break; 131 } 132 } 133 *len = sg_len; 134 135 /* return the moved sg_head pointer */ 136 return sg; 137 } 138 139 /** 140 * nx_walk_and_build - walk a linux scatterlist and build an nx scatterlist 141 * 142 * @nx_dst: pointer to the first nx_sg element to write 143 * @sglen: max number of nx_sg entries we're allowed to write 144 * @sg_src: pointer to the source linux scatterlist to walk 145 * @start: number of bytes to fast-forward past at the beginning of @sg_src 146 * @src_len: number of bytes to walk in @sg_src 147 */ 148 struct nx_sg *nx_walk_and_build(struct nx_sg *nx_dst, 149 unsigned int sglen, 150 struct scatterlist *sg_src, 151 unsigned int start, 152 unsigned int *src_len) 153 { 154 struct scatter_walk walk; 155 struct nx_sg *nx_sg = nx_dst; 156 unsigned int n, len = *src_len; 157 char *dst; 158 159 /* we need to fast forward through @start bytes first */ 160 scatterwalk_start_at_pos(&walk, sg_src, start); 161 162 while (len && (nx_sg - nx_dst) < sglen) { 163 dst = scatterwalk_next(&walk, len, &n); 164 165 nx_sg = nx_build_sg_list(nx_sg, dst, &n, sglen - (nx_sg - nx_dst)); 166 167 scatterwalk_done_src(&walk, dst, n); 168 len -= n; 169 } 170 /* update to_process */ 171 *src_len -= len; 172 173 /* return the moved destination pointer */ 174 return nx_sg; 175 } 176 177 /** 178 * trim_sg_list - ensures the bound in sg list. 179 * @sg: sg list head 180 * @end: sg lisg end 181 * @delta: is the amount we need to crop in order to bound the list. 182 * @nbytes: length of data in the scatterlists or data length - whichever 183 * is greater. 184 */ 185 static long int trim_sg_list(struct nx_sg *sg, 186 struct nx_sg *end, 187 unsigned int delta, 188 unsigned int *nbytes) 189 { 190 long int oplen; 191 long int data_back; 192 unsigned int is_delta = delta; 193 194 while (delta && end > sg) { 195 struct nx_sg *last = end - 1; 196 197 if (last->len > delta) { 198 last->len -= delta; 199 delta = 0; 200 } else { 201 end--; 202 delta -= last->len; 203 } 204 } 205 206 /* There are cases where we need to crop list in order to make it 207 * a block size multiple, but we also need to align data. In order to 208 * that we need to calculate how much we need to put back to be 209 * processed 210 */ 211 oplen = (sg - end) * sizeof(struct nx_sg); 212 if (is_delta) { 213 data_back = (abs(oplen) / AES_BLOCK_SIZE) * sg->len; 214 data_back = *nbytes - (data_back & ~(AES_BLOCK_SIZE - 1)); 215 *nbytes -= data_back; 216 } 217 218 return oplen; 219 } 220 221 /** 222 * nx_build_sg_lists - walk the input scatterlists and build arrays of NX 223 * scatterlists based on them. 224 * 225 * @nx_ctx: NX crypto context for the lists we're building 226 * @iv: iv data, if the algorithm requires it 227 * @dst: destination scatterlist 228 * @src: source scatterlist 229 * @nbytes: length of data described in the scatterlists 230 * @offset: number of bytes to fast-forward past at the beginning of 231 * scatterlists. 232 * @oiv: destination for the iv data, if the algorithm requires it 233 * 234 * This is common code shared by all the AES algorithms. It uses the crypto 235 * scatterlist walk routines to traverse input and output scatterlists, building 236 * corresponding NX scatterlists 237 */ 238 int nx_build_sg_lists(struct nx_crypto_ctx *nx_ctx, 239 const u8 *iv, 240 struct scatterlist *dst, 241 struct scatterlist *src, 242 unsigned int *nbytes, 243 unsigned int offset, 244 u8 *oiv) 245 { 246 unsigned int delta = 0; 247 unsigned int total = *nbytes; 248 struct nx_sg *nx_insg = nx_ctx->in_sg; 249 struct nx_sg *nx_outsg = nx_ctx->out_sg; 250 unsigned int max_sg_len; 251 252 max_sg_len = min_t(u64, nx_ctx->ap->sglen, 253 nx_driver.of.max_sg_len/sizeof(struct nx_sg)); 254 max_sg_len = min_t(u64, max_sg_len, 255 nx_ctx->ap->databytelen/NX_PAGE_SIZE); 256 257 if (oiv) 258 memcpy(oiv, iv, AES_BLOCK_SIZE); 259 260 *nbytes = min_t(u64, *nbytes, nx_ctx->ap->databytelen); 261 262 nx_outsg = nx_walk_and_build(nx_outsg, max_sg_len, dst, 263 offset, nbytes); 264 nx_insg = nx_walk_and_build(nx_insg, max_sg_len, src, 265 offset, nbytes); 266 267 if (*nbytes < total) 268 delta = *nbytes - (*nbytes & ~(AES_BLOCK_SIZE - 1)); 269 270 /* these lengths should be negative, which will indicate to phyp that 271 * the input and output parameters are scatterlists, not linear 272 * buffers */ 273 nx_ctx->op.inlen = trim_sg_list(nx_ctx->in_sg, nx_insg, delta, nbytes); 274 nx_ctx->op.outlen = trim_sg_list(nx_ctx->out_sg, nx_outsg, delta, nbytes); 275 276 return 0; 277 } 278 279 /** 280 * nx_ctx_init - initialize an nx_ctx's vio_pfo_op struct 281 * 282 * @nx_ctx: the nx context to initialize 283 * @function: the function code for the op 284 */ 285 void nx_ctx_init(struct nx_crypto_ctx *nx_ctx, unsigned int function) 286 { 287 spin_lock_init(&nx_ctx->lock); 288 memset(nx_ctx->kmem, 0, nx_ctx->kmem_len); 289 nx_ctx->csbcpb->csb.valid |= NX_CSB_VALID_BIT; 290 291 nx_ctx->op.flags = function; 292 nx_ctx->op.csbcpb = __pa(nx_ctx->csbcpb); 293 nx_ctx->op.in = __pa(nx_ctx->in_sg); 294 nx_ctx->op.out = __pa(nx_ctx->out_sg); 295 296 if (nx_ctx->csbcpb_aead) { 297 nx_ctx->csbcpb_aead->csb.valid |= NX_CSB_VALID_BIT; 298 299 nx_ctx->op_aead.flags = function; 300 nx_ctx->op_aead.csbcpb = __pa(nx_ctx->csbcpb_aead); 301 nx_ctx->op_aead.in = __pa(nx_ctx->in_sg); 302 nx_ctx->op_aead.out = __pa(nx_ctx->out_sg); 303 } 304 } 305 306 static void nx_of_update_status(struct device *dev, 307 struct property *p, 308 struct nx_of *props) 309 { 310 if (!strncmp(p->value, "okay", p->length)) { 311 props->status = NX_WAITING; 312 props->flags |= NX_OF_FLAG_STATUS_SET; 313 } else { 314 dev_info(dev, "%s: status '%s' is not 'okay'\n", __func__, 315 (char *)p->value); 316 } 317 } 318 319 static void nx_of_update_sglen(struct device *dev, 320 struct property *p, 321 struct nx_of *props) 322 { 323 if (p->length != sizeof(props->max_sg_len)) { 324 dev_err(dev, "%s: unexpected format for " 325 "ibm,max-sg-len property\n", __func__); 326 dev_dbg(dev, "%s: ibm,max-sg-len is %d bytes " 327 "long, expected %zd bytes\n", __func__, 328 p->length, sizeof(props->max_sg_len)); 329 return; 330 } 331 332 props->max_sg_len = *(u32 *)p->value; 333 props->flags |= NX_OF_FLAG_MAXSGLEN_SET; 334 } 335 336 static void nx_of_update_msc(struct device *dev, 337 struct property *p, 338 struct nx_of *props) 339 { 340 struct msc_triplet *trip; 341 struct max_sync_cop *msc; 342 unsigned int bytes_so_far, i, lenp; 343 344 msc = (struct max_sync_cop *)p->value; 345 lenp = p->length; 346 347 /* You can't tell if the data read in for this property is sane by its 348 * size alone. This is because there are sizes embedded in the data 349 * structure. The best we can do is check lengths as we parse and bail 350 * as soon as a length error is detected. */ 351 bytes_so_far = 0; 352 353 while ((bytes_so_far + sizeof(struct max_sync_cop)) <= lenp) { 354 bytes_so_far += sizeof(struct max_sync_cop); 355 356 trip = msc->trip; 357 358 for (i = 0; 359 ((bytes_so_far + sizeof(struct msc_triplet)) <= lenp) && 360 i < msc->triplets; 361 i++) { 362 if (msc->fc >= NX_MAX_FC || msc->mode >= NX_MAX_MODE) { 363 dev_err(dev, "unknown function code/mode " 364 "combo: %d/%d (ignored)\n", msc->fc, 365 msc->mode); 366 goto next_loop; 367 } 368 369 if (!trip->sglen || trip->databytelen < NX_PAGE_SIZE) { 370 dev_warn(dev, "bogus sglen/databytelen: " 371 "%u/%u (ignored)\n", trip->sglen, 372 trip->databytelen); 373 goto next_loop; 374 } 375 376 switch (trip->keybitlen) { 377 case 128: 378 case 160: 379 props->ap[msc->fc][msc->mode][0].databytelen = 380 trip->databytelen; 381 props->ap[msc->fc][msc->mode][0].sglen = 382 trip->sglen; 383 break; 384 case 192: 385 props->ap[msc->fc][msc->mode][1].databytelen = 386 trip->databytelen; 387 props->ap[msc->fc][msc->mode][1].sglen = 388 trip->sglen; 389 break; 390 case 256: 391 if (msc->fc == NX_FC_AES) { 392 props->ap[msc->fc][msc->mode][2]. 393 databytelen = trip->databytelen; 394 props->ap[msc->fc][msc->mode][2].sglen = 395 trip->sglen; 396 } else if (msc->fc == NX_FC_AES_HMAC || 397 msc->fc == NX_FC_SHA) { 398 props->ap[msc->fc][msc->mode][1]. 399 databytelen = trip->databytelen; 400 props->ap[msc->fc][msc->mode][1].sglen = 401 trip->sglen; 402 } else { 403 dev_warn(dev, "unknown function " 404 "code/key bit len combo" 405 ": (%u/256)\n", msc->fc); 406 } 407 break; 408 case 512: 409 props->ap[msc->fc][msc->mode][2].databytelen = 410 trip->databytelen; 411 props->ap[msc->fc][msc->mode][2].sglen = 412 trip->sglen; 413 break; 414 default: 415 dev_warn(dev, "unknown function code/key bit " 416 "len combo: (%u/%u)\n", msc->fc, 417 trip->keybitlen); 418 break; 419 } 420 next_loop: 421 bytes_so_far += sizeof(struct msc_triplet); 422 trip++; 423 } 424 425 msc = (struct max_sync_cop *)trip; 426 } 427 428 props->flags |= NX_OF_FLAG_MAXSYNCCOP_SET; 429 } 430 431 /** 432 * nx_of_init - read openFirmware values from the device tree 433 * 434 * @dev: device handle 435 * @props: pointer to struct to hold the properties values 436 * 437 * Called once at driver probe time, this function will read out the 438 * openFirmware properties we use at runtime. If all the OF properties are 439 * acceptable, when we exit this function props->flags will indicate that 440 * we're ready to register our crypto algorithms. 441 */ 442 static void nx_of_init(struct device *dev, struct nx_of *props) 443 { 444 struct device_node *base_node = dev->of_node; 445 struct property *p; 446 447 p = of_find_property(base_node, "status", NULL); 448 if (!p) 449 dev_info(dev, "%s: property 'status' not found\n", __func__); 450 else 451 nx_of_update_status(dev, p, props); 452 453 p = of_find_property(base_node, "ibm,max-sg-len", NULL); 454 if (!p) 455 dev_info(dev, "%s: property 'ibm,max-sg-len' not found\n", 456 __func__); 457 else 458 nx_of_update_sglen(dev, p, props); 459 460 p = of_find_property(base_node, "ibm,max-sync-cop", NULL); 461 if (!p) 462 dev_info(dev, "%s: property 'ibm,max-sync-cop' not found\n", 463 __func__); 464 else 465 nx_of_update_msc(dev, p, props); 466 } 467 468 static bool nx_check_prop(struct device *dev, u32 fc, u32 mode, int slot) 469 { 470 struct alg_props *props = &nx_driver.of.ap[fc][mode][slot]; 471 472 if (!props->sglen || props->databytelen < NX_PAGE_SIZE) { 473 if (dev) 474 dev_warn(dev, "bogus sglen/databytelen for %u/%u/%u: " 475 "%u/%u (ignored)\n", fc, mode, slot, 476 props->sglen, props->databytelen); 477 return false; 478 } 479 480 return true; 481 } 482 483 static bool nx_check_props(struct device *dev, u32 fc, u32 mode) 484 { 485 int i; 486 487 for (i = 0; i < 3; i++) 488 if (!nx_check_prop(dev, fc, mode, i)) 489 return false; 490 491 return true; 492 } 493 494 static int nx_register_skcipher(struct skcipher_alg *alg, u32 fc, u32 mode) 495 { 496 return nx_check_props(&nx_driver.viodev->dev, fc, mode) ? 497 crypto_register_skcipher(alg) : 0; 498 } 499 500 static int nx_register_aead(struct aead_alg *alg, u32 fc, u32 mode) 501 { 502 return nx_check_props(&nx_driver.viodev->dev, fc, mode) ? 503 crypto_register_aead(alg) : 0; 504 } 505 506 static int nx_register_shash(struct shash_alg *alg, u32 fc, u32 mode, int slot) 507 { 508 return (slot >= 0 ? nx_check_prop(&nx_driver.viodev->dev, 509 fc, mode, slot) : 510 nx_check_props(&nx_driver.viodev->dev, fc, mode)) ? 511 crypto_register_shash(alg) : 0; 512 } 513 514 static void nx_unregister_skcipher(struct skcipher_alg *alg, u32 fc, u32 mode) 515 { 516 if (nx_check_props(NULL, fc, mode)) 517 crypto_unregister_skcipher(alg); 518 } 519 520 static void nx_unregister_aead(struct aead_alg *alg, u32 fc, u32 mode) 521 { 522 if (nx_check_props(NULL, fc, mode)) 523 crypto_unregister_aead(alg); 524 } 525 526 static void nx_unregister_shash(struct shash_alg *alg, u32 fc, u32 mode, 527 int slot) 528 { 529 if (slot >= 0 ? nx_check_prop(NULL, fc, mode, slot) : 530 nx_check_props(NULL, fc, mode)) 531 crypto_unregister_shash(alg); 532 } 533 534 /** 535 * nx_register_algs - register algorithms with the crypto API 536 * 537 * Called from nx_probe() 538 * 539 * If all OF properties are in an acceptable state, the driver flags will 540 * indicate that we're ready and we'll create our debugfs files and register 541 * out crypto algorithms. 542 */ 543 static int nx_register_algs(void) 544 { 545 int rc = -1; 546 547 if (nx_driver.of.flags != NX_OF_FLAG_MASK_READY) 548 goto out; 549 550 memset(&nx_driver.stats, 0, sizeof(struct nx_stats)); 551 552 NX_DEBUGFS_INIT(&nx_driver); 553 554 nx_driver.of.status = NX_OKAY; 555 556 rc = nx_register_skcipher(&nx_ecb_aes_alg, NX_FC_AES, NX_MODE_AES_ECB); 557 if (rc) 558 goto out; 559 560 rc = nx_register_skcipher(&nx_cbc_aes_alg, NX_FC_AES, NX_MODE_AES_CBC); 561 if (rc) 562 goto out_unreg_ecb; 563 564 rc = nx_register_skcipher(&nx_ctr3686_aes_alg, NX_FC_AES, 565 NX_MODE_AES_CTR); 566 if (rc) 567 goto out_unreg_cbc; 568 569 rc = nx_register_aead(&nx_gcm_aes_alg, NX_FC_AES, NX_MODE_AES_GCM); 570 if (rc) 571 goto out_unreg_ctr3686; 572 573 rc = nx_register_aead(&nx_gcm4106_aes_alg, NX_FC_AES, NX_MODE_AES_GCM); 574 if (rc) 575 goto out_unreg_gcm; 576 577 rc = nx_register_aead(&nx_ccm_aes_alg, NX_FC_AES, NX_MODE_AES_CCM); 578 if (rc) 579 goto out_unreg_gcm4106; 580 581 rc = nx_register_aead(&nx_ccm4309_aes_alg, NX_FC_AES, NX_MODE_AES_CCM); 582 if (rc) 583 goto out_unreg_ccm; 584 585 rc = nx_register_shash(&nx_shash_sha256_alg, NX_FC_SHA, NX_MODE_SHA, 586 NX_PROPS_SHA256); 587 if (rc) 588 goto out_unreg_ccm4309; 589 590 rc = nx_register_shash(&nx_shash_sha512_alg, NX_FC_SHA, NX_MODE_SHA, 591 NX_PROPS_SHA512); 592 if (rc) 593 goto out_unreg_s256; 594 595 rc = nx_register_shash(&nx_shash_aes_xcbc_alg, 596 NX_FC_AES, NX_MODE_AES_XCBC_MAC, -1); 597 if (rc) 598 goto out_unreg_s512; 599 600 goto out; 601 602 out_unreg_s512: 603 nx_unregister_shash(&nx_shash_sha512_alg, NX_FC_SHA, NX_MODE_SHA, 604 NX_PROPS_SHA512); 605 out_unreg_s256: 606 nx_unregister_shash(&nx_shash_sha256_alg, NX_FC_SHA, NX_MODE_SHA, 607 NX_PROPS_SHA256); 608 out_unreg_ccm4309: 609 nx_unregister_aead(&nx_ccm4309_aes_alg, NX_FC_AES, NX_MODE_AES_CCM); 610 out_unreg_ccm: 611 nx_unregister_aead(&nx_ccm_aes_alg, NX_FC_AES, NX_MODE_AES_CCM); 612 out_unreg_gcm4106: 613 nx_unregister_aead(&nx_gcm4106_aes_alg, NX_FC_AES, NX_MODE_AES_GCM); 614 out_unreg_gcm: 615 nx_unregister_aead(&nx_gcm_aes_alg, NX_FC_AES, NX_MODE_AES_GCM); 616 out_unreg_ctr3686: 617 nx_unregister_skcipher(&nx_ctr3686_aes_alg, NX_FC_AES, NX_MODE_AES_CTR); 618 out_unreg_cbc: 619 nx_unregister_skcipher(&nx_cbc_aes_alg, NX_FC_AES, NX_MODE_AES_CBC); 620 out_unreg_ecb: 621 nx_unregister_skcipher(&nx_ecb_aes_alg, NX_FC_AES, NX_MODE_AES_ECB); 622 out: 623 return rc; 624 } 625 626 /** 627 * nx_crypto_ctx_init - create and initialize a crypto api context 628 * 629 * @nx_ctx: the crypto api context 630 * @fc: function code for the context 631 * @mode: the function code specific mode for this context 632 */ 633 static int nx_crypto_ctx_init(struct nx_crypto_ctx *nx_ctx, u32 fc, u32 mode) 634 { 635 if (nx_driver.of.status != NX_OKAY) { 636 pr_err("Attempt to initialize NX crypto context while device " 637 "is not available!\n"); 638 return -ENODEV; 639 } 640 641 /* we need an extra page for csbcpb_aead for these modes */ 642 if (mode == NX_MODE_AES_GCM || mode == NX_MODE_AES_CCM) 643 nx_ctx->kmem_len = (5 * NX_PAGE_SIZE) + 644 sizeof(struct nx_csbcpb); 645 else 646 nx_ctx->kmem_len = (4 * NX_PAGE_SIZE) + 647 sizeof(struct nx_csbcpb); 648 649 nx_ctx->kmem = kmalloc(nx_ctx->kmem_len, GFP_KERNEL); 650 if (!nx_ctx->kmem) 651 return -ENOMEM; 652 653 /* the csbcpb and scatterlists must be 4K aligned pages */ 654 nx_ctx->csbcpb = (struct nx_csbcpb *)(round_up((u64)nx_ctx->kmem, 655 (u64)NX_PAGE_SIZE)); 656 nx_ctx->in_sg = (struct nx_sg *)((u8 *)nx_ctx->csbcpb + NX_PAGE_SIZE); 657 nx_ctx->out_sg = (struct nx_sg *)((u8 *)nx_ctx->in_sg + NX_PAGE_SIZE); 658 659 if (mode == NX_MODE_AES_GCM || mode == NX_MODE_AES_CCM) 660 nx_ctx->csbcpb_aead = 661 (struct nx_csbcpb *)((u8 *)nx_ctx->out_sg + 662 NX_PAGE_SIZE); 663 664 /* give each context a pointer to global stats and their OF 665 * properties */ 666 nx_ctx->stats = &nx_driver.stats; 667 memcpy(nx_ctx->props, nx_driver.of.ap[fc][mode], 668 sizeof(struct alg_props) * 3); 669 670 return 0; 671 } 672 673 /* entry points from the crypto tfm initializers */ 674 int nx_crypto_ctx_aes_ccm_init(struct crypto_aead *tfm) 675 { 676 crypto_aead_set_reqsize(tfm, sizeof(struct nx_ccm_rctx)); 677 return nx_crypto_ctx_init(crypto_aead_ctx(tfm), NX_FC_AES, 678 NX_MODE_AES_CCM); 679 } 680 681 int nx_crypto_ctx_aes_gcm_init(struct crypto_aead *tfm) 682 { 683 crypto_aead_set_reqsize(tfm, sizeof(struct nx_gcm_rctx)); 684 return nx_crypto_ctx_init(crypto_aead_ctx(tfm), NX_FC_AES, 685 NX_MODE_AES_GCM); 686 } 687 688 int nx_crypto_ctx_aes_ctr_init(struct crypto_skcipher *tfm) 689 { 690 return nx_crypto_ctx_init(crypto_skcipher_ctx(tfm), NX_FC_AES, 691 NX_MODE_AES_CTR); 692 } 693 694 int nx_crypto_ctx_aes_cbc_init(struct crypto_skcipher *tfm) 695 { 696 return nx_crypto_ctx_init(crypto_skcipher_ctx(tfm), NX_FC_AES, 697 NX_MODE_AES_CBC); 698 } 699 700 int nx_crypto_ctx_aes_ecb_init(struct crypto_skcipher *tfm) 701 { 702 return nx_crypto_ctx_init(crypto_skcipher_ctx(tfm), NX_FC_AES, 703 NX_MODE_AES_ECB); 704 } 705 706 int nx_crypto_ctx_sha_init(struct crypto_tfm *tfm) 707 { 708 return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_SHA, NX_MODE_SHA); 709 } 710 711 int nx_crypto_ctx_aes_xcbc_init(struct crypto_tfm *tfm) 712 { 713 return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_AES, 714 NX_MODE_AES_XCBC_MAC); 715 } 716 717 /** 718 * nx_crypto_ctx_exit - destroy a crypto api context 719 * 720 * @tfm: the crypto transform pointer for the context 721 * 722 * As crypto API contexts are destroyed, this exit hook is called to free the 723 * memory associated with it. 724 */ 725 void nx_crypto_ctx_exit(struct crypto_tfm *tfm) 726 { 727 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); 728 729 kfree_sensitive(nx_ctx->kmem); 730 nx_ctx->csbcpb = NULL; 731 nx_ctx->csbcpb_aead = NULL; 732 nx_ctx->in_sg = NULL; 733 nx_ctx->out_sg = NULL; 734 } 735 736 void nx_crypto_ctx_skcipher_exit(struct crypto_skcipher *tfm) 737 { 738 nx_crypto_ctx_exit(crypto_skcipher_ctx(tfm)); 739 } 740 741 void nx_crypto_ctx_aead_exit(struct crypto_aead *tfm) 742 { 743 struct nx_crypto_ctx *nx_ctx = crypto_aead_ctx(tfm); 744 745 kfree_sensitive(nx_ctx->kmem); 746 } 747 748 static int nx_probe(struct vio_dev *viodev, const struct vio_device_id *id) 749 { 750 dev_dbg(&viodev->dev, "driver probed: %s resource id: 0x%x\n", 751 viodev->name, viodev->resource_id); 752 753 if (nx_driver.viodev) { 754 dev_err(&viodev->dev, "%s: Attempt to register more than one " 755 "instance of the hardware\n", __func__); 756 return -EINVAL; 757 } 758 759 nx_driver.viodev = viodev; 760 761 nx_of_init(&viodev->dev, &nx_driver.of); 762 763 return nx_register_algs(); 764 } 765 766 static void nx_remove(struct vio_dev *viodev) 767 { 768 dev_dbg(&viodev->dev, "entering nx_remove for UA 0x%x\n", 769 viodev->unit_address); 770 771 if (nx_driver.of.status == NX_OKAY) { 772 NX_DEBUGFS_FINI(&nx_driver); 773 774 nx_unregister_shash(&nx_shash_aes_xcbc_alg, 775 NX_FC_AES, NX_MODE_AES_XCBC_MAC, -1); 776 nx_unregister_shash(&nx_shash_sha512_alg, 777 NX_FC_SHA, NX_MODE_SHA, NX_PROPS_SHA256); 778 nx_unregister_shash(&nx_shash_sha256_alg, 779 NX_FC_SHA, NX_MODE_SHA, NX_PROPS_SHA512); 780 nx_unregister_aead(&nx_ccm4309_aes_alg, 781 NX_FC_AES, NX_MODE_AES_CCM); 782 nx_unregister_aead(&nx_ccm_aes_alg, NX_FC_AES, NX_MODE_AES_CCM); 783 nx_unregister_aead(&nx_gcm4106_aes_alg, 784 NX_FC_AES, NX_MODE_AES_GCM); 785 nx_unregister_aead(&nx_gcm_aes_alg, 786 NX_FC_AES, NX_MODE_AES_GCM); 787 nx_unregister_skcipher(&nx_ctr3686_aes_alg, 788 NX_FC_AES, NX_MODE_AES_CTR); 789 nx_unregister_skcipher(&nx_cbc_aes_alg, NX_FC_AES, 790 NX_MODE_AES_CBC); 791 nx_unregister_skcipher(&nx_ecb_aes_alg, NX_FC_AES, 792 NX_MODE_AES_ECB); 793 } 794 } 795 796 797 /* module wide initialization/cleanup */ 798 static int __init nx_init(void) 799 { 800 return vio_register_driver(&nx_driver.viodriver); 801 } 802 803 static void __exit nx_fini(void) 804 { 805 vio_unregister_driver(&nx_driver.viodriver); 806 } 807 808 static const struct vio_device_id nx_crypto_driver_ids[] = { 809 { "ibm,sym-encryption-v1", "ibm,sym-encryption" }, 810 { "", "" } 811 }; 812 MODULE_DEVICE_TABLE(vio, nx_crypto_driver_ids); 813 814 /* driver state structure */ 815 struct nx_crypto_driver nx_driver = { 816 .viodriver = { 817 .id_table = nx_crypto_driver_ids, 818 .probe = nx_probe, 819 .remove = nx_remove, 820 .name = NX_NAME, 821 }, 822 }; 823 824 module_init(nx_init); 825 module_exit(nx_fini); 826 827 MODULE_AUTHOR("Kent Yoder <yoder1@us.ibm.com>"); 828 MODULE_DESCRIPTION(NX_STRING); 829 MODULE_LICENSE("GPL"); 830 MODULE_VERSION(NX_VERSION); 831