1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Intel MAX10 Board Management Controller Secure Update Driver 4 * 5 * Copyright (C) 2019-2022 Intel Corporation. All rights reserved. 6 * 7 */ 8 #include <linux/bitfield.h> 9 #include <linux/device.h> 10 #include <linux/firmware.h> 11 #include <linux/mfd/intel-m10-bmc.h> 12 #include <linux/mod_devicetable.h> 13 #include <linux/module.h> 14 #include <linux/platform_device.h> 15 #include <linux/slab.h> 16 17 struct m10bmc_sec; 18 19 struct m10bmc_sec_ops { 20 int (*rsu_status)(struct m10bmc_sec *sec); 21 }; 22 23 struct m10bmc_sec { 24 struct device *dev; 25 struct intel_m10bmc *m10bmc; 26 struct fw_upload *fwl; 27 char *fw_name; 28 u32 fw_name_id; 29 bool cancel_request; 30 const struct m10bmc_sec_ops *ops; 31 }; 32 33 static DEFINE_XARRAY_ALLOC(fw_upload_xa); 34 35 /* Root Entry Hash (REH) support */ 36 #define REH_SHA256_SIZE 32 37 #define REH_SHA384_SIZE 48 38 #define REH_MAGIC GENMASK(15, 0) 39 #define REH_SHA_NUM_BYTES GENMASK(31, 16) 40 41 static int m10bmc_sec_write(struct m10bmc_sec *sec, const u8 *buf, u32 offset, u32 size) 42 { 43 struct intel_m10bmc *m10bmc = sec->m10bmc; 44 unsigned int stride = regmap_get_reg_stride(m10bmc->regmap); 45 u32 write_count = size / stride; 46 u32 leftover_offset = write_count * stride; 47 u32 leftover_size = size - leftover_offset; 48 u32 leftover_tmp = 0; 49 int ret; 50 51 if (sec->m10bmc->flash_bulk_ops) 52 return sec->m10bmc->flash_bulk_ops->write(m10bmc, buf, offset, size); 53 54 if (WARN_ON_ONCE(stride > sizeof(leftover_tmp))) 55 return -EINVAL; 56 57 ret = regmap_bulk_write(m10bmc->regmap, M10BMC_STAGING_BASE + offset, 58 buf + offset, write_count); 59 if (ret) 60 return ret; 61 62 /* If size is not aligned to stride, handle the remainder bytes with regmap_write() */ 63 if (leftover_size) { 64 memcpy(&leftover_tmp, buf + leftover_offset, leftover_size); 65 ret = regmap_write(m10bmc->regmap, M10BMC_STAGING_BASE + offset + leftover_offset, 66 leftover_tmp); 67 if (ret) 68 return ret; 69 } 70 71 return 0; 72 } 73 74 static int m10bmc_sec_read(struct m10bmc_sec *sec, u8 *buf, u32 addr, u32 size) 75 { 76 struct intel_m10bmc *m10bmc = sec->m10bmc; 77 unsigned int stride = regmap_get_reg_stride(m10bmc->regmap); 78 u32 read_count = size / stride; 79 u32 leftover_offset = read_count * stride; 80 u32 leftover_size = size - leftover_offset; 81 u32 leftover_tmp; 82 int ret; 83 84 if (sec->m10bmc->flash_bulk_ops) 85 return sec->m10bmc->flash_bulk_ops->read(m10bmc, buf, addr, size); 86 87 if (WARN_ON_ONCE(stride > sizeof(leftover_tmp))) 88 return -EINVAL; 89 90 ret = regmap_bulk_read(m10bmc->regmap, addr, buf, read_count); 91 if (ret) 92 return ret; 93 94 /* If size is not aligned to stride, handle the remainder bytes with regmap_read() */ 95 if (leftover_size) { 96 ret = regmap_read(m10bmc->regmap, addr + leftover_offset, &leftover_tmp); 97 if (ret) 98 return ret; 99 memcpy(buf + leftover_offset, &leftover_tmp, leftover_size); 100 } 101 102 return 0; 103 } 104 105 106 static ssize_t 107 show_root_entry_hash(struct device *dev, u32 exp_magic, 108 u32 prog_addr, u32 reh_addr, char *buf) 109 { 110 struct m10bmc_sec *sec = dev_get_drvdata(dev); 111 int sha_num_bytes, i, ret, cnt = 0; 112 u8 hash[REH_SHA384_SIZE]; 113 u32 magic; 114 115 ret = m10bmc_sec_read(sec, (u8 *)&magic, prog_addr, sizeof(magic)); 116 if (ret) 117 return ret; 118 119 if (FIELD_GET(REH_MAGIC, magic) != exp_magic) 120 return sysfs_emit(buf, "hash not programmed\n"); 121 122 sha_num_bytes = FIELD_GET(REH_SHA_NUM_BYTES, magic) / 8; 123 if (sha_num_bytes != REH_SHA256_SIZE && 124 sha_num_bytes != REH_SHA384_SIZE) { 125 dev_err(sec->dev, "%s bad sha num bytes %d\n", __func__, 126 sha_num_bytes); 127 return -EINVAL; 128 } 129 130 ret = m10bmc_sec_read(sec, hash, reh_addr, sha_num_bytes); 131 if (ret) { 132 dev_err(dev, "failed to read root entry hash\n"); 133 return ret; 134 } 135 136 for (i = 0; i < sha_num_bytes; i++) 137 cnt += sprintf(buf + cnt, "%02x", hash[i]); 138 cnt += sprintf(buf + cnt, "\n"); 139 140 return cnt; 141 } 142 143 #define DEVICE_ATTR_SEC_REH_RO(_name) \ 144 static ssize_t _name##_root_entry_hash_show(struct device *dev, \ 145 struct device_attribute *attr, \ 146 char *buf) \ 147 { \ 148 struct m10bmc_sec *sec = dev_get_drvdata(dev); \ 149 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; \ 150 \ 151 return show_root_entry_hash(dev, csr_map->_name##_magic, \ 152 csr_map->_name##_prog_addr, \ 153 csr_map->_name##_reh_addr, \ 154 buf); \ 155 } \ 156 static DEVICE_ATTR_RO(_name##_root_entry_hash) 157 158 DEVICE_ATTR_SEC_REH_RO(bmc); 159 DEVICE_ATTR_SEC_REH_RO(sr); 160 DEVICE_ATTR_SEC_REH_RO(pr); 161 162 #define CSK_BIT_LEN 128U 163 #define CSK_32ARRAY_SIZE DIV_ROUND_UP(CSK_BIT_LEN, 32) 164 165 static ssize_t 166 show_canceled_csk(struct device *dev, u32 addr, char *buf) 167 { 168 unsigned int i, size = CSK_32ARRAY_SIZE * sizeof(u32); 169 struct m10bmc_sec *sec = dev_get_drvdata(dev); 170 DECLARE_BITMAP(csk_map, CSK_BIT_LEN); 171 __le32 csk_le32[CSK_32ARRAY_SIZE]; 172 u32 csk32[CSK_32ARRAY_SIZE]; 173 int ret; 174 175 ret = m10bmc_sec_read(sec, (u8 *)&csk_le32, addr, size); 176 if (ret) { 177 dev_err(sec->dev, "failed to read CSK vector\n"); 178 return ret; 179 } 180 181 for (i = 0; i < CSK_32ARRAY_SIZE; i++) 182 csk32[i] = le32_to_cpu(((csk_le32[i]))); 183 184 bitmap_from_arr32(csk_map, csk32, CSK_BIT_LEN); 185 bitmap_complement(csk_map, csk_map, CSK_BIT_LEN); 186 return bitmap_print_to_pagebuf(1, buf, csk_map, CSK_BIT_LEN); 187 } 188 189 #define DEVICE_ATTR_SEC_CSK_RO(_name) \ 190 static ssize_t _name##_canceled_csks_show(struct device *dev, \ 191 struct device_attribute *attr, \ 192 char *buf) \ 193 { \ 194 struct m10bmc_sec *sec = dev_get_drvdata(dev); \ 195 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; \ 196 \ 197 return show_canceled_csk(dev, \ 198 csr_map->_name##_prog_addr + CSK_VEC_OFFSET, \ 199 buf); \ 200 } \ 201 static DEVICE_ATTR_RO(_name##_canceled_csks) 202 203 #define CSK_VEC_OFFSET 0x34 204 205 DEVICE_ATTR_SEC_CSK_RO(bmc); 206 DEVICE_ATTR_SEC_CSK_RO(sr); 207 DEVICE_ATTR_SEC_CSK_RO(pr); 208 209 #define FLASH_COUNT_SIZE 4096 /* count stored as inverted bit vector */ 210 211 static ssize_t flash_count_show(struct device *dev, 212 struct device_attribute *attr, char *buf) 213 { 214 struct m10bmc_sec *sec = dev_get_drvdata(dev); 215 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 216 unsigned int num_bits; 217 u8 *flash_buf; 218 int cnt, ret; 219 220 num_bits = FLASH_COUNT_SIZE * 8; 221 222 flash_buf = kmalloc(FLASH_COUNT_SIZE, GFP_KERNEL); 223 if (!flash_buf) 224 return -ENOMEM; 225 226 ret = m10bmc_sec_read(sec, flash_buf, csr_map->rsu_update_counter, 227 FLASH_COUNT_SIZE); 228 if (ret) { 229 dev_err(sec->dev, "failed to read flash count\n"); 230 goto exit_free; 231 } 232 cnt = num_bits - bitmap_weight((unsigned long *)flash_buf, num_bits); 233 234 exit_free: 235 kfree(flash_buf); 236 237 return ret ? : sysfs_emit(buf, "%u\n", cnt); 238 } 239 static DEVICE_ATTR_RO(flash_count); 240 241 static struct attribute *m10bmc_security_attrs[] = { 242 &dev_attr_flash_count.attr, 243 &dev_attr_bmc_root_entry_hash.attr, 244 &dev_attr_sr_root_entry_hash.attr, 245 &dev_attr_pr_root_entry_hash.attr, 246 &dev_attr_sr_canceled_csks.attr, 247 &dev_attr_pr_canceled_csks.attr, 248 &dev_attr_bmc_canceled_csks.attr, 249 NULL, 250 }; 251 252 static struct attribute_group m10bmc_security_attr_group = { 253 .name = "security", 254 .attrs = m10bmc_security_attrs, 255 }; 256 257 static const struct attribute_group *m10bmc_sec_attr_groups[] = { 258 &m10bmc_security_attr_group, 259 NULL, 260 }; 261 262 static void log_error_regs(struct m10bmc_sec *sec, u32 doorbell) 263 { 264 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 265 u32 auth_result; 266 267 dev_err(sec->dev, "Doorbell: 0x%08x\n", doorbell); 268 269 if (!m10bmc_sys_read(sec->m10bmc, csr_map->auth_result, &auth_result)) 270 dev_err(sec->dev, "RSU auth result: 0x%08x\n", auth_result); 271 } 272 273 static int m10bmc_sec_n3000_rsu_status(struct m10bmc_sec *sec) 274 { 275 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 276 u32 doorbell; 277 int ret; 278 279 ret = m10bmc_sys_read(sec->m10bmc, csr_map->doorbell, &doorbell); 280 if (ret) 281 return ret; 282 283 return FIELD_GET(DRBL_RSU_STATUS, doorbell); 284 } 285 286 static int m10bmc_sec_n6000_rsu_status(struct m10bmc_sec *sec) 287 { 288 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 289 u32 auth_result; 290 int ret; 291 292 ret = m10bmc_sys_read(sec->m10bmc, csr_map->auth_result, &auth_result); 293 if (ret) 294 return ret; 295 296 return FIELD_GET(AUTH_RESULT_RSU_STATUS, auth_result); 297 } 298 299 static bool rsu_status_ok(u32 status) 300 { 301 return (status == RSU_STAT_NORMAL || 302 status == RSU_STAT_NIOS_OK || 303 status == RSU_STAT_USER_OK || 304 status == RSU_STAT_FACTORY_OK); 305 } 306 307 static bool rsu_progress_done(u32 progress) 308 { 309 return (progress == RSU_PROG_IDLE || 310 progress == RSU_PROG_RSU_DONE); 311 } 312 313 static bool rsu_progress_busy(u32 progress) 314 { 315 return (progress == RSU_PROG_AUTHENTICATING || 316 progress == RSU_PROG_COPYING || 317 progress == RSU_PROG_UPDATE_CANCEL || 318 progress == RSU_PROG_PROGRAM_KEY_HASH); 319 } 320 321 static int m10bmc_sec_progress_status(struct m10bmc_sec *sec, u32 *doorbell_reg, 322 u32 *progress, u32 *status) 323 { 324 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 325 int ret; 326 327 ret = m10bmc_sys_read(sec->m10bmc, csr_map->doorbell, doorbell_reg); 328 if (ret) 329 return ret; 330 331 ret = sec->ops->rsu_status(sec); 332 if (ret < 0) 333 return ret; 334 335 *status = ret; 336 *progress = rsu_prog(*doorbell_reg); 337 338 return 0; 339 } 340 341 static enum fw_upload_err rsu_check_idle(struct m10bmc_sec *sec) 342 { 343 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 344 u32 doorbell; 345 int ret; 346 347 ret = m10bmc_sys_read(sec->m10bmc, csr_map->doorbell, &doorbell); 348 if (ret) 349 return FW_UPLOAD_ERR_RW_ERROR; 350 351 if (!rsu_progress_done(rsu_prog(doorbell))) { 352 log_error_regs(sec, doorbell); 353 return FW_UPLOAD_ERR_BUSY; 354 } 355 356 return FW_UPLOAD_ERR_NONE; 357 } 358 359 static inline bool rsu_start_done(u32 doorbell_reg, u32 progress, u32 status) 360 { 361 if (doorbell_reg & DRBL_RSU_REQUEST) 362 return false; 363 364 if (status == RSU_STAT_ERASE_FAIL || status == RSU_STAT_WEAROUT) 365 return true; 366 367 if (!rsu_progress_done(progress)) 368 return true; 369 370 return false; 371 } 372 373 static enum fw_upload_err rsu_update_init(struct m10bmc_sec *sec) 374 { 375 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 376 u32 doorbell_reg, progress, status; 377 int ret, err; 378 379 ret = regmap_update_bits(sec->m10bmc->regmap, 380 csr_map->base + csr_map->doorbell, 381 DRBL_RSU_REQUEST | DRBL_HOST_STATUS, 382 DRBL_RSU_REQUEST | 383 FIELD_PREP(DRBL_HOST_STATUS, 384 HOST_STATUS_IDLE)); 385 if (ret) 386 return FW_UPLOAD_ERR_RW_ERROR; 387 388 ret = read_poll_timeout(m10bmc_sec_progress_status, err, 389 err < 0 || rsu_start_done(doorbell_reg, progress, status), 390 NIOS_HANDSHAKE_INTERVAL_US, 391 NIOS_HANDSHAKE_TIMEOUT_US, 392 false, 393 sec, &doorbell_reg, &progress, &status); 394 395 if (ret == -ETIMEDOUT) { 396 log_error_regs(sec, doorbell_reg); 397 return FW_UPLOAD_ERR_TIMEOUT; 398 } else if (err) { 399 return FW_UPLOAD_ERR_RW_ERROR; 400 } 401 402 if (status == RSU_STAT_WEAROUT) { 403 dev_warn(sec->dev, "Excessive flash update count detected\n"); 404 return FW_UPLOAD_ERR_WEAROUT; 405 } else if (status == RSU_STAT_ERASE_FAIL) { 406 log_error_regs(sec, doorbell_reg); 407 return FW_UPLOAD_ERR_HW_ERROR; 408 } 409 410 return FW_UPLOAD_ERR_NONE; 411 } 412 413 static enum fw_upload_err rsu_prog_ready(struct m10bmc_sec *sec) 414 { 415 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 416 unsigned long poll_timeout; 417 u32 doorbell, progress; 418 int ret; 419 420 ret = m10bmc_sys_read(sec->m10bmc, csr_map->doorbell, &doorbell); 421 if (ret) 422 return FW_UPLOAD_ERR_RW_ERROR; 423 424 poll_timeout = jiffies + msecs_to_jiffies(RSU_PREP_TIMEOUT_MS); 425 while (rsu_prog(doorbell) == RSU_PROG_PREPARE) { 426 msleep(RSU_PREP_INTERVAL_MS); 427 if (time_after(jiffies, poll_timeout)) 428 break; 429 430 ret = m10bmc_sys_read(sec->m10bmc, csr_map->doorbell, &doorbell); 431 if (ret) 432 return FW_UPLOAD_ERR_RW_ERROR; 433 } 434 435 progress = rsu_prog(doorbell); 436 if (progress == RSU_PROG_PREPARE) { 437 log_error_regs(sec, doorbell); 438 return FW_UPLOAD_ERR_TIMEOUT; 439 } else if (progress != RSU_PROG_READY) { 440 log_error_regs(sec, doorbell); 441 return FW_UPLOAD_ERR_HW_ERROR; 442 } 443 444 return FW_UPLOAD_ERR_NONE; 445 } 446 447 static enum fw_upload_err rsu_send_data(struct m10bmc_sec *sec) 448 { 449 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 450 u32 doorbell_reg, status; 451 int ret; 452 453 ret = regmap_update_bits(sec->m10bmc->regmap, 454 csr_map->base + csr_map->doorbell, 455 DRBL_HOST_STATUS, 456 FIELD_PREP(DRBL_HOST_STATUS, 457 HOST_STATUS_WRITE_DONE)); 458 if (ret) 459 return FW_UPLOAD_ERR_RW_ERROR; 460 461 ret = regmap_read_poll_timeout(sec->m10bmc->regmap, 462 csr_map->base + csr_map->doorbell, 463 doorbell_reg, 464 rsu_prog(doorbell_reg) != RSU_PROG_READY, 465 NIOS_HANDSHAKE_INTERVAL_US, 466 NIOS_HANDSHAKE_TIMEOUT_US); 467 468 if (ret == -ETIMEDOUT) { 469 log_error_regs(sec, doorbell_reg); 470 return FW_UPLOAD_ERR_TIMEOUT; 471 } else if (ret) { 472 return FW_UPLOAD_ERR_RW_ERROR; 473 } 474 475 ret = sec->ops->rsu_status(sec); 476 if (ret < 0) 477 return FW_UPLOAD_ERR_HW_ERROR; 478 status = ret; 479 480 if (!rsu_status_ok(status)) { 481 log_error_regs(sec, doorbell_reg); 482 return FW_UPLOAD_ERR_HW_ERROR; 483 } 484 485 return FW_UPLOAD_ERR_NONE; 486 } 487 488 static int rsu_check_complete(struct m10bmc_sec *sec, u32 *doorbell_reg) 489 { 490 u32 progress, status; 491 492 if (m10bmc_sec_progress_status(sec, doorbell_reg, &progress, &status)) 493 return -EIO; 494 495 if (!rsu_status_ok(status)) 496 return -EINVAL; 497 498 if (rsu_progress_done(progress)) 499 return 0; 500 501 if (rsu_progress_busy(progress)) 502 return -EAGAIN; 503 504 return -EINVAL; 505 } 506 507 static enum fw_upload_err rsu_cancel(struct m10bmc_sec *sec) 508 { 509 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 510 u32 doorbell; 511 int ret; 512 513 ret = m10bmc_sys_read(sec->m10bmc, csr_map->doorbell, &doorbell); 514 if (ret) 515 return FW_UPLOAD_ERR_RW_ERROR; 516 517 if (rsu_prog(doorbell) != RSU_PROG_READY) 518 return FW_UPLOAD_ERR_BUSY; 519 520 ret = regmap_update_bits(sec->m10bmc->regmap, 521 csr_map->base + csr_map->doorbell, 522 DRBL_HOST_STATUS, 523 FIELD_PREP(DRBL_HOST_STATUS, 524 HOST_STATUS_ABORT_RSU)); 525 if (ret) 526 return FW_UPLOAD_ERR_RW_ERROR; 527 528 return FW_UPLOAD_ERR_CANCELED; 529 } 530 531 static enum fw_upload_err m10bmc_sec_prepare(struct fw_upload *fwl, 532 const u8 *data, u32 size) 533 { 534 struct m10bmc_sec *sec = fwl->dd_handle; 535 u32 ret; 536 537 sec->cancel_request = false; 538 539 if (!size || size > M10BMC_STAGING_SIZE) 540 return FW_UPLOAD_ERR_INVALID_SIZE; 541 542 if (sec->m10bmc->flash_bulk_ops) 543 if (sec->m10bmc->flash_bulk_ops->lock_write(sec->m10bmc)) 544 return FW_UPLOAD_ERR_BUSY; 545 546 ret = rsu_check_idle(sec); 547 if (ret != FW_UPLOAD_ERR_NONE) 548 goto unlock_flash; 549 550 ret = rsu_update_init(sec); 551 if (ret != FW_UPLOAD_ERR_NONE) 552 goto unlock_flash; 553 554 ret = rsu_prog_ready(sec); 555 if (ret != FW_UPLOAD_ERR_NONE) 556 goto unlock_flash; 557 558 if (sec->cancel_request) { 559 ret = rsu_cancel(sec); 560 goto unlock_flash; 561 } 562 563 return FW_UPLOAD_ERR_NONE; 564 565 unlock_flash: 566 if (sec->m10bmc->flash_bulk_ops) 567 sec->m10bmc->flash_bulk_ops->unlock_write(sec->m10bmc); 568 return ret; 569 } 570 571 #define WRITE_BLOCK_SIZE 0x4000 /* Default write-block size is 0x4000 bytes */ 572 573 static enum fw_upload_err m10bmc_sec_fw_write(struct fw_upload *fwl, const u8 *data, 574 u32 offset, u32 size, u32 *written) 575 { 576 struct m10bmc_sec *sec = fwl->dd_handle; 577 const struct m10bmc_csr_map *csr_map = sec->m10bmc->info->csr_map; 578 struct intel_m10bmc *m10bmc = sec->m10bmc; 579 u32 blk_size, doorbell; 580 int ret; 581 582 if (sec->cancel_request) 583 return rsu_cancel(sec); 584 585 ret = m10bmc_sys_read(m10bmc, csr_map->doorbell, &doorbell); 586 if (ret) { 587 return FW_UPLOAD_ERR_RW_ERROR; 588 } else if (rsu_prog(doorbell) != RSU_PROG_READY) { 589 log_error_regs(sec, doorbell); 590 return FW_UPLOAD_ERR_HW_ERROR; 591 } 592 593 WARN_ON_ONCE(WRITE_BLOCK_SIZE % regmap_get_reg_stride(m10bmc->regmap)); 594 blk_size = min_t(u32, WRITE_BLOCK_SIZE, size); 595 ret = m10bmc_sec_write(sec, data, offset, blk_size); 596 if (ret) 597 return FW_UPLOAD_ERR_RW_ERROR; 598 599 *written = blk_size; 600 return FW_UPLOAD_ERR_NONE; 601 } 602 603 static enum fw_upload_err m10bmc_sec_poll_complete(struct fw_upload *fwl) 604 { 605 struct m10bmc_sec *sec = fwl->dd_handle; 606 unsigned long poll_timeout; 607 u32 doorbell, result; 608 int ret; 609 610 if (sec->cancel_request) 611 return rsu_cancel(sec); 612 613 result = rsu_send_data(sec); 614 if (result != FW_UPLOAD_ERR_NONE) 615 return result; 616 617 poll_timeout = jiffies + msecs_to_jiffies(RSU_COMPLETE_TIMEOUT_MS); 618 do { 619 msleep(RSU_COMPLETE_INTERVAL_MS); 620 ret = rsu_check_complete(sec, &doorbell); 621 } while (ret == -EAGAIN && !time_after(jiffies, poll_timeout)); 622 623 if (ret == -EAGAIN) { 624 log_error_regs(sec, doorbell); 625 return FW_UPLOAD_ERR_TIMEOUT; 626 } else if (ret == -EIO) { 627 return FW_UPLOAD_ERR_RW_ERROR; 628 } else if (ret) { 629 log_error_regs(sec, doorbell); 630 return FW_UPLOAD_ERR_HW_ERROR; 631 } 632 633 return FW_UPLOAD_ERR_NONE; 634 } 635 636 /* 637 * m10bmc_sec_cancel() may be called asynchronously with an on-going update. 638 * All other functions are called sequentially in a single thread. To avoid 639 * contention on register accesses, m10bmc_sec_cancel() must only update 640 * the cancel_request flag. Other functions will check this flag and handle 641 * the cancel request synchronously. 642 */ 643 static void m10bmc_sec_cancel(struct fw_upload *fwl) 644 { 645 struct m10bmc_sec *sec = fwl->dd_handle; 646 647 sec->cancel_request = true; 648 } 649 650 static void m10bmc_sec_cleanup(struct fw_upload *fwl) 651 { 652 struct m10bmc_sec *sec = fwl->dd_handle; 653 654 (void)rsu_cancel(sec); 655 656 if (sec->m10bmc->flash_bulk_ops) 657 sec->m10bmc->flash_bulk_ops->unlock_write(sec->m10bmc); 658 } 659 660 static const struct fw_upload_ops m10bmc_ops = { 661 .prepare = m10bmc_sec_prepare, 662 .write = m10bmc_sec_fw_write, 663 .poll_complete = m10bmc_sec_poll_complete, 664 .cancel = m10bmc_sec_cancel, 665 .cleanup = m10bmc_sec_cleanup, 666 }; 667 668 static const struct m10bmc_sec_ops m10sec_n3000_ops = { 669 .rsu_status = m10bmc_sec_n3000_rsu_status, 670 }; 671 672 static const struct m10bmc_sec_ops m10sec_n6000_ops = { 673 .rsu_status = m10bmc_sec_n6000_rsu_status, 674 }; 675 676 #define SEC_UPDATE_LEN_MAX 32 677 static int m10bmc_sec_probe(struct platform_device *pdev) 678 { 679 char buf[SEC_UPDATE_LEN_MAX]; 680 struct m10bmc_sec *sec; 681 struct fw_upload *fwl; 682 unsigned int len; 683 int ret; 684 685 sec = devm_kzalloc(&pdev->dev, sizeof(*sec), GFP_KERNEL); 686 if (!sec) 687 return -ENOMEM; 688 689 sec->dev = &pdev->dev; 690 sec->m10bmc = dev_get_drvdata(pdev->dev.parent); 691 sec->ops = (struct m10bmc_sec_ops *)platform_get_device_id(pdev)->driver_data; 692 dev_set_drvdata(&pdev->dev, sec); 693 694 ret = xa_alloc(&fw_upload_xa, &sec->fw_name_id, sec, 695 xa_limit_32b, GFP_KERNEL); 696 if (ret) 697 return ret; 698 699 len = scnprintf(buf, SEC_UPDATE_LEN_MAX, "secure-update%d", 700 sec->fw_name_id); 701 sec->fw_name = kmemdup_nul(buf, len, GFP_KERNEL); 702 if (!sec->fw_name) { 703 ret = -ENOMEM; 704 goto fw_name_fail; 705 } 706 707 fwl = firmware_upload_register(THIS_MODULE, sec->dev, sec->fw_name, 708 &m10bmc_ops, sec); 709 if (IS_ERR(fwl)) { 710 dev_err(sec->dev, "Firmware Upload driver failed to start\n"); 711 ret = PTR_ERR(fwl); 712 goto fw_uploader_fail; 713 } 714 715 sec->fwl = fwl; 716 return 0; 717 718 fw_uploader_fail: 719 kfree(sec->fw_name); 720 fw_name_fail: 721 xa_erase(&fw_upload_xa, sec->fw_name_id); 722 return ret; 723 } 724 725 static int m10bmc_sec_remove(struct platform_device *pdev) 726 { 727 struct m10bmc_sec *sec = dev_get_drvdata(&pdev->dev); 728 729 firmware_upload_unregister(sec->fwl); 730 kfree(sec->fw_name); 731 xa_erase(&fw_upload_xa, sec->fw_name_id); 732 733 return 0; 734 } 735 736 static const struct platform_device_id intel_m10bmc_sec_ids[] = { 737 { 738 .name = "n3000bmc-sec-update", 739 .driver_data = (kernel_ulong_t)&m10sec_n3000_ops, 740 }, 741 { 742 .name = "d5005bmc-sec-update", 743 .driver_data = (kernel_ulong_t)&m10sec_n3000_ops, 744 }, 745 { 746 .name = "n6000bmc-sec-update", 747 .driver_data = (kernel_ulong_t)&m10sec_n6000_ops, 748 }, 749 { } 750 }; 751 MODULE_DEVICE_TABLE(platform, intel_m10bmc_sec_ids); 752 753 static struct platform_driver intel_m10bmc_sec_driver = { 754 .probe = m10bmc_sec_probe, 755 .remove = m10bmc_sec_remove, 756 .driver = { 757 .name = "intel-m10bmc-sec-update", 758 .dev_groups = m10bmc_sec_attr_groups, 759 }, 760 .id_table = intel_m10bmc_sec_ids, 761 }; 762 module_platform_driver(intel_m10bmc_sec_driver); 763 764 MODULE_AUTHOR("Intel Corporation"); 765 MODULE_DESCRIPTION("Intel MAX10 BMC Secure Update"); 766 MODULE_LICENSE("GPL"); 767