1 /* 2 * tpm_tis_common.c - QEMU's TPM TIS interface emulator 3 * device agnostic functions 4 * 5 * Copyright (C) 2006,2010-2013 IBM Corporation 6 * 7 * Authors: 8 * Stefan Berger <stefanb@us.ibm.com> 9 * David Safford <safford@us.ibm.com> 10 * 11 * Xen 4 support: Andrease Niederl <andreas.niederl@iaik.tugraz.at> 12 * 13 * This work is licensed under the terms of the GNU GPL, version 2 or later. 14 * See the COPYING file in the top-level directory. 15 * 16 * Implementation of the TIS interface according to specs found at 17 * http://www.trustedcomputinggroup.org. This implementation currently 18 * supports version 1.3, 21 March 2013 19 * In the developers menu choose the PC Client section then find the TIS 20 * specification. 21 * 22 * TPM TIS for TPM 2 implementation following TCG PC Client Platform 23 * TPM Profile (PTP) Specification, Family 2.0, Revision 00.43 24 */ 25 #include "qemu/osdep.h" 26 #include "hw/irq.h" 27 #include "hw/isa/isa.h" 28 #include "qapi/error.h" 29 #include "qemu/bswap.h" 30 #include "qemu/crc-ccitt.h" 31 #include "qemu/module.h" 32 33 #include "hw/acpi/tpm.h" 34 #include "hw/pci/pci_ids.h" 35 #include "hw/qdev-properties.h" 36 #include "migration/vmstate.h" 37 #include "sysemu/tpm_backend.h" 38 #include "sysemu/tpm_util.h" 39 #include "tpm_ppi.h" 40 #include "trace.h" 41 42 #include "tpm_tis.h" 43 44 #define DEBUG_TIS 0 45 46 /* local prototypes */ 47 48 static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr, 49 unsigned size); 50 51 /* utility functions */ 52 53 static uint8_t tpm_tis_locality_from_addr(hwaddr addr) 54 { 55 uint8_t locty; 56 57 locty = (uint8_t)((addr >> TPM_TIS_LOCALITY_SHIFT) & 0x7); 58 assert(TPM_TIS_IS_VALID_LOCTY(locty)); 59 60 return locty; 61 } 62 63 64 /* 65 * Set the given flags in the STS register by clearing the register but 66 * preserving the SELFTEST_DONE and TPM_FAMILY_MASK flags and then setting 67 * the new flags. 68 * 69 * The SELFTEST_DONE flag is acquired from the backend that determines it by 70 * peeking into TPM commands. 71 * 72 * A VM suspend/resume will preserve the flag by storing it into the VM 73 * device state, but the backend will not remember it when QEMU is started 74 * again. Therefore, we cache the flag here. Once set, it will not be unset 75 * except by a reset. 76 */ 77 static void tpm_tis_sts_set(TPMLocality *l, uint32_t flags) 78 { 79 l->sts &= TPM_TIS_STS_SELFTEST_DONE | TPM_TIS_STS_TPM_FAMILY_MASK; 80 l->sts |= flags; 81 } 82 83 /* 84 * Send a request to the TPM. 85 */ 86 static void tpm_tis_tpm_send(TPMState *s, uint8_t locty) 87 { 88 tpm_util_show_buffer(s->buffer, s->be_buffer_size, "To TPM"); 89 90 /* 91 * rw_offset serves as length indicator for length of data; 92 * it's reset when the response comes back 93 */ 94 s->loc[locty].state = TPM_TIS_STATE_EXECUTION; 95 96 s->cmd = (TPMBackendCmd) { 97 .locty = locty, 98 .in = s->buffer, 99 .in_len = s->rw_offset, 100 .out = s->buffer, 101 .out_len = s->be_buffer_size, 102 }; 103 104 tpm_backend_deliver_request(s->be_driver, &s->cmd); 105 } 106 107 /* raise an interrupt if allowed */ 108 static void tpm_tis_raise_irq(TPMState *s, uint8_t locty, uint32_t irqmask) 109 { 110 if (!TPM_TIS_IS_VALID_LOCTY(locty)) { 111 return; 112 } 113 114 if ((s->loc[locty].inte & TPM_TIS_INT_ENABLED) && 115 (s->loc[locty].inte & irqmask)) { 116 trace_tpm_tis_raise_irq(irqmask); 117 qemu_irq_raise(s->irq); 118 s->loc[locty].ints |= irqmask; 119 } 120 } 121 122 static uint32_t tpm_tis_check_request_use_except(TPMState *s, uint8_t locty) 123 { 124 uint8_t l; 125 126 for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) { 127 if (l == locty) { 128 continue; 129 } 130 if ((s->loc[l].access & TPM_TIS_ACCESS_REQUEST_USE)) { 131 return 1; 132 } 133 } 134 135 return 0; 136 } 137 138 static void tpm_tis_new_active_locality(TPMState *s, uint8_t new_active_locty) 139 { 140 bool change = (s->active_locty != new_active_locty); 141 bool is_seize; 142 uint8_t mask; 143 144 if (change && TPM_TIS_IS_VALID_LOCTY(s->active_locty)) { 145 is_seize = TPM_TIS_IS_VALID_LOCTY(new_active_locty) && 146 s->loc[new_active_locty].access & TPM_TIS_ACCESS_SEIZE; 147 148 if (is_seize) { 149 mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY); 150 } else { 151 mask = ~(TPM_TIS_ACCESS_ACTIVE_LOCALITY| 152 TPM_TIS_ACCESS_REQUEST_USE); 153 } 154 /* reset flags on the old active locality */ 155 s->loc[s->active_locty].access &= mask; 156 157 if (is_seize) { 158 s->loc[s->active_locty].access |= TPM_TIS_ACCESS_BEEN_SEIZED; 159 } 160 } 161 162 s->active_locty = new_active_locty; 163 164 trace_tpm_tis_new_active_locality(s->active_locty); 165 166 if (TPM_TIS_IS_VALID_LOCTY(new_active_locty)) { 167 /* set flags on the new active locality */ 168 s->loc[new_active_locty].access |= TPM_TIS_ACCESS_ACTIVE_LOCALITY; 169 s->loc[new_active_locty].access &= ~(TPM_TIS_ACCESS_REQUEST_USE | 170 TPM_TIS_ACCESS_SEIZE); 171 } 172 173 if (change) { 174 tpm_tis_raise_irq(s, s->active_locty, TPM_TIS_INT_LOCALITY_CHANGED); 175 } 176 } 177 178 /* abort -- this function switches the locality */ 179 static void tpm_tis_abort(TPMState *s) 180 { 181 s->rw_offset = 0; 182 183 trace_tpm_tis_abort(s->next_locty); 184 185 /* 186 * Need to react differently depending on who's aborting now and 187 * which locality will become active afterwards. 188 */ 189 if (s->aborting_locty == s->next_locty) { 190 s->loc[s->aborting_locty].state = TPM_TIS_STATE_READY; 191 tpm_tis_sts_set(&s->loc[s->aborting_locty], 192 TPM_TIS_STS_COMMAND_READY); 193 tpm_tis_raise_irq(s, s->aborting_locty, TPM_TIS_INT_COMMAND_READY); 194 } 195 196 /* locality after abort is another one than the current one */ 197 tpm_tis_new_active_locality(s, s->next_locty); 198 199 s->next_locty = TPM_TIS_NO_LOCALITY; 200 /* nobody's aborting a command anymore */ 201 s->aborting_locty = TPM_TIS_NO_LOCALITY; 202 } 203 204 /* prepare aborting current command */ 205 static void tpm_tis_prep_abort(TPMState *s, uint8_t locty, uint8_t newlocty) 206 { 207 uint8_t busy_locty; 208 209 assert(TPM_TIS_IS_VALID_LOCTY(newlocty)); 210 211 s->aborting_locty = locty; /* may also be TPM_TIS_NO_LOCALITY */ 212 s->next_locty = newlocty; /* locality after successful abort */ 213 214 /* 215 * only abort a command using an interrupt if currently executing 216 * a command AND if there's a valid connection to the vTPM. 217 */ 218 for (busy_locty = 0; busy_locty < TPM_TIS_NUM_LOCALITIES; busy_locty++) { 219 if (s->loc[busy_locty].state == TPM_TIS_STATE_EXECUTION) { 220 /* 221 * request the backend to cancel. Some backends may not 222 * support it 223 */ 224 tpm_backend_cancel_cmd(s->be_driver); 225 return; 226 } 227 } 228 229 tpm_tis_abort(s); 230 } 231 232 /* 233 * Callback from the TPM to indicate that the response was received. 234 */ 235 void tpm_tis_request_completed(TPMState *s, int ret) 236 { 237 uint8_t locty = s->cmd.locty; 238 uint8_t l; 239 240 assert(TPM_TIS_IS_VALID_LOCTY(locty)); 241 242 if (s->cmd.selftest_done) { 243 for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) { 244 s->loc[l].sts |= TPM_TIS_STS_SELFTEST_DONE; 245 } 246 } 247 248 /* FIXME: report error if ret != 0 */ 249 tpm_tis_sts_set(&s->loc[locty], 250 TPM_TIS_STS_VALID | TPM_TIS_STS_DATA_AVAILABLE); 251 s->loc[locty].state = TPM_TIS_STATE_COMPLETION; 252 s->rw_offset = 0; 253 254 tpm_util_show_buffer(s->buffer, s->be_buffer_size, "From TPM"); 255 256 if (TPM_TIS_IS_VALID_LOCTY(s->next_locty)) { 257 tpm_tis_abort(s); 258 } 259 260 tpm_tis_raise_irq(s, locty, 261 TPM_TIS_INT_DATA_AVAILABLE | TPM_TIS_INT_STS_VALID); 262 } 263 264 /* 265 * Read a byte of response data 266 */ 267 static uint32_t tpm_tis_data_read(TPMState *s, uint8_t locty) 268 { 269 uint32_t ret = TPM_TIS_NO_DATA_BYTE; 270 uint16_t len; 271 272 if ((s->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) { 273 len = MIN(tpm_cmd_get_size(&s->buffer), 274 s->be_buffer_size); 275 276 ret = s->buffer[s->rw_offset++]; 277 if (s->rw_offset >= len) { 278 /* got last byte */ 279 tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID); 280 tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID); 281 } 282 trace_tpm_tis_data_read(ret, s->rw_offset - 1); 283 } 284 285 return ret; 286 } 287 288 #ifdef DEBUG_TIS 289 static void tpm_tis_dump_state(TPMState *s, hwaddr addr) 290 { 291 static const unsigned regs[] = { 292 TPM_TIS_REG_ACCESS, 293 TPM_TIS_REG_INT_ENABLE, 294 TPM_TIS_REG_INT_VECTOR, 295 TPM_TIS_REG_INT_STATUS, 296 TPM_TIS_REG_INTF_CAPABILITY, 297 TPM_TIS_REG_STS, 298 TPM_TIS_REG_DID_VID, 299 TPM_TIS_REG_RID, 300 0xfff}; 301 int idx; 302 uint8_t locty = tpm_tis_locality_from_addr(addr); 303 hwaddr base = addr & ~0xfff; 304 305 printf("tpm_tis: active locality : %d\n" 306 "tpm_tis: state of locality %d : %d\n" 307 "tpm_tis: register dump:\n", 308 s->active_locty, 309 locty, s->loc[locty].state); 310 311 for (idx = 0; regs[idx] != 0xfff; idx++) { 312 printf("tpm_tis: 0x%04x : 0x%08x\n", regs[idx], 313 (int)tpm_tis_mmio_read(s, base + regs[idx], 4)); 314 } 315 316 printf("tpm_tis: r/w offset : %d\n" 317 "tpm_tis: result buffer : ", 318 s->rw_offset); 319 for (idx = 0; 320 idx < MIN(tpm_cmd_get_size(&s->buffer), s->be_buffer_size); 321 idx++) { 322 printf("%c%02x%s", 323 s->rw_offset == idx ? '>' : ' ', 324 s->buffer[idx], 325 ((idx & 0xf) == 0xf) ? "\ntpm_tis: " : ""); 326 } 327 printf("\n"); 328 } 329 #endif 330 331 /* 332 * Read a register of the TIS interface 333 * See specs pages 33-63 for description of the registers 334 */ 335 static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr, 336 unsigned size) 337 { 338 TPMState *s = opaque; 339 uint16_t offset = addr & 0xffc; 340 uint8_t shift = (addr & 0x3) * 8; 341 uint32_t val = 0xffffffff; 342 uint8_t locty = tpm_tis_locality_from_addr(addr); 343 uint32_t avail; 344 uint8_t v; 345 346 if (tpm_backend_had_startup_error(s->be_driver)) { 347 return 0; 348 } 349 350 switch (offset) { 351 case TPM_TIS_REG_ACCESS: 352 /* never show the SEIZE flag even though we use it internally */ 353 val = s->loc[locty].access & ~TPM_TIS_ACCESS_SEIZE; 354 /* the pending flag is always calculated */ 355 if (tpm_tis_check_request_use_except(s, locty)) { 356 val |= TPM_TIS_ACCESS_PENDING_REQUEST; 357 } 358 val |= !tpm_backend_get_tpm_established_flag(s->be_driver); 359 break; 360 case TPM_TIS_REG_INT_ENABLE: 361 val = s->loc[locty].inte; 362 break; 363 case TPM_TIS_REG_INT_VECTOR: 364 val = s->irq_num; 365 break; 366 case TPM_TIS_REG_INT_STATUS: 367 val = s->loc[locty].ints; 368 break; 369 case TPM_TIS_REG_INTF_CAPABILITY: 370 switch (s->be_tpm_version) { 371 case TPM_VERSION_UNSPEC: 372 val = 0; 373 break; 374 case TPM_VERSION_1_2: 375 val = TPM_TIS_CAPABILITIES_SUPPORTED1_3; 376 break; 377 case TPM_VERSION_2_0: 378 val = TPM_TIS_CAPABILITIES_SUPPORTED2_0; 379 break; 380 } 381 break; 382 case TPM_TIS_REG_STS: 383 if (s->active_locty == locty) { 384 if ((s->loc[locty].sts & TPM_TIS_STS_DATA_AVAILABLE)) { 385 val = TPM_TIS_BURST_COUNT( 386 MIN(tpm_cmd_get_size(&s->buffer), 387 s->be_buffer_size) 388 - s->rw_offset) | s->loc[locty].sts; 389 } else { 390 avail = s->be_buffer_size - s->rw_offset; 391 /* 392 * byte-sized reads should not return 0x00 for 0x100 393 * available bytes. 394 */ 395 if (size == 1 && avail > 0xff) { 396 avail = 0xff; 397 } 398 val = TPM_TIS_BURST_COUNT(avail) | s->loc[locty].sts; 399 } 400 } 401 break; 402 case TPM_TIS_REG_DATA_FIFO: 403 case TPM_TIS_REG_DATA_XFIFO ... TPM_TIS_REG_DATA_XFIFO_END: 404 if (s->active_locty == locty) { 405 if (size > 4 - (addr & 0x3)) { 406 /* prevent access beyond FIFO */ 407 size = 4 - (addr & 0x3); 408 } 409 val = 0; 410 shift = 0; 411 while (size > 0) { 412 switch (s->loc[locty].state) { 413 case TPM_TIS_STATE_COMPLETION: 414 v = tpm_tis_data_read(s, locty); 415 break; 416 default: 417 v = TPM_TIS_NO_DATA_BYTE; 418 break; 419 } 420 val |= (v << shift); 421 shift += 8; 422 size--; 423 } 424 shift = 0; /* no more adjustments */ 425 } 426 break; 427 case TPM_TIS_REG_INTERFACE_ID: 428 val = s->loc[locty].iface_id; 429 break; 430 case TPM_TIS_REG_DID_VID: 431 val = (TPM_TIS_TPM_DID << 16) | TPM_TIS_TPM_VID; 432 break; 433 case TPM_TIS_REG_RID: 434 val = TPM_TIS_TPM_RID; 435 break; 436 #ifdef DEBUG_TIS 437 case TPM_TIS_REG_DEBUG: 438 tpm_tis_dump_state(s, addr); 439 break; 440 #endif 441 } 442 443 if (shift) { 444 val >>= shift; 445 } 446 447 trace_tpm_tis_mmio_read(size, addr, val); 448 449 return val; 450 } 451 452 /* 453 * A wrapper read function so that it can be directly called without 454 * mmio. 455 */ 456 uint32_t tpm_tis_read_data(TPMState *s, hwaddr addr, unsigned size) 457 { 458 return tpm_tis_mmio_read(s, addr, size); 459 } 460 461 /* 462 * Calculate current data buffer checksum 463 */ 464 uint16_t tpm_tis_get_checksum(TPMState *s) 465 { 466 return bswap16(crc_ccitt(0, s->buffer, s->rw_offset)); 467 } 468 469 /* 470 * Write a value to a register of the TIS interface 471 * See specs pages 33-63 for description of the registers 472 */ 473 static void tpm_tis_mmio_write(void *opaque, hwaddr addr, 474 uint64_t val, unsigned size) 475 { 476 TPMState *s = opaque; 477 uint16_t off = addr & 0xffc; 478 uint8_t shift = (addr & 0x3) * 8; 479 uint8_t locty = tpm_tis_locality_from_addr(addr); 480 uint8_t active_locty, l; 481 int c, set_new_locty = 1; 482 uint16_t len; 483 uint32_t mask = (size == 1) ? 0xff : ((size == 2) ? 0xffff : ~0); 484 485 trace_tpm_tis_mmio_write(size, addr, val); 486 487 if (locty == 4) { 488 trace_tpm_tis_mmio_write_locty4(); 489 return; 490 } 491 492 if (tpm_backend_had_startup_error(s->be_driver)) { 493 return; 494 } 495 496 val &= mask; 497 498 if (shift) { 499 val <<= shift; 500 mask <<= shift; 501 } 502 503 mask ^= 0xffffffff; 504 505 switch (off) { 506 case TPM_TIS_REG_ACCESS: 507 508 if ((val & TPM_TIS_ACCESS_SEIZE)) { 509 val &= ~(TPM_TIS_ACCESS_REQUEST_USE | 510 TPM_TIS_ACCESS_ACTIVE_LOCALITY); 511 } 512 513 active_locty = s->active_locty; 514 515 if ((val & TPM_TIS_ACCESS_ACTIVE_LOCALITY)) { 516 /* give up locality if currently owned */ 517 if (s->active_locty == locty) { 518 trace_tpm_tis_mmio_write_release_locty(locty); 519 520 uint8_t newlocty = TPM_TIS_NO_LOCALITY; 521 /* anybody wants the locality ? */ 522 for (c = TPM_TIS_NUM_LOCALITIES - 1; c >= 0; c--) { 523 if ((s->loc[c].access & TPM_TIS_ACCESS_REQUEST_USE)) { 524 trace_tpm_tis_mmio_write_locty_req_use(c); 525 newlocty = c; 526 break; 527 } 528 } 529 trace_tpm_tis_mmio_write_next_locty(newlocty); 530 531 if (TPM_TIS_IS_VALID_LOCTY(newlocty)) { 532 set_new_locty = 0; 533 tpm_tis_prep_abort(s, locty, newlocty); 534 } else { 535 active_locty = TPM_TIS_NO_LOCALITY; 536 } 537 } else { 538 /* not currently the owner; clear a pending request */ 539 s->loc[locty].access &= ~TPM_TIS_ACCESS_REQUEST_USE; 540 } 541 } 542 543 if ((val & TPM_TIS_ACCESS_BEEN_SEIZED)) { 544 s->loc[locty].access &= ~TPM_TIS_ACCESS_BEEN_SEIZED; 545 } 546 547 if ((val & TPM_TIS_ACCESS_SEIZE)) { 548 /* 549 * allow seize if a locality is active and the requesting 550 * locality is higher than the one that's active 551 * OR 552 * allow seize for requesting locality if no locality is 553 * active 554 */ 555 while ((TPM_TIS_IS_VALID_LOCTY(s->active_locty) && 556 locty > s->active_locty) || 557 !TPM_TIS_IS_VALID_LOCTY(s->active_locty)) { 558 bool higher_seize = false; 559 560 /* already a pending SEIZE ? */ 561 if ((s->loc[locty].access & TPM_TIS_ACCESS_SEIZE)) { 562 break; 563 } 564 565 /* check for ongoing seize by a higher locality */ 566 for (l = locty + 1; l < TPM_TIS_NUM_LOCALITIES; l++) { 567 if ((s->loc[l].access & TPM_TIS_ACCESS_SEIZE)) { 568 higher_seize = true; 569 break; 570 } 571 } 572 573 if (higher_seize) { 574 break; 575 } 576 577 /* cancel any seize by a lower locality */ 578 for (l = 0; l < locty; l++) { 579 s->loc[l].access &= ~TPM_TIS_ACCESS_SEIZE; 580 } 581 582 s->loc[locty].access |= TPM_TIS_ACCESS_SEIZE; 583 584 trace_tpm_tis_mmio_write_locty_seized(locty, s->active_locty); 585 trace_tpm_tis_mmio_write_init_abort(); 586 587 set_new_locty = 0; 588 tpm_tis_prep_abort(s, s->active_locty, locty); 589 break; 590 } 591 } 592 593 if ((val & TPM_TIS_ACCESS_REQUEST_USE)) { 594 if (s->active_locty != locty) { 595 if (TPM_TIS_IS_VALID_LOCTY(s->active_locty)) { 596 s->loc[locty].access |= TPM_TIS_ACCESS_REQUEST_USE; 597 } else { 598 /* no locality active -> make this one active now */ 599 active_locty = locty; 600 } 601 } 602 } 603 604 if (set_new_locty) { 605 tpm_tis_new_active_locality(s, active_locty); 606 } 607 608 break; 609 case TPM_TIS_REG_INT_ENABLE: 610 s->loc[locty].inte &= mask; 611 s->loc[locty].inte |= (val & (TPM_TIS_INT_ENABLED | 612 TPM_TIS_INT_POLARITY_MASK | 613 TPM_TIS_INTERRUPTS_SUPPORTED)); 614 break; 615 case TPM_TIS_REG_INT_VECTOR: 616 /* hard wired -- ignore */ 617 break; 618 case TPM_TIS_REG_INT_STATUS: 619 /* clearing of interrupt flags */ 620 if (((val & TPM_TIS_INTERRUPTS_SUPPORTED)) && 621 (s->loc[locty].ints & TPM_TIS_INTERRUPTS_SUPPORTED)) { 622 s->loc[locty].ints &= ~val; 623 if (s->loc[locty].ints == 0) { 624 qemu_irq_lower(s->irq); 625 trace_tpm_tis_mmio_write_lowering_irq(); 626 } 627 } 628 s->loc[locty].ints &= ~(val & TPM_TIS_INTERRUPTS_SUPPORTED); 629 break; 630 case TPM_TIS_REG_STS: 631 if (s->active_locty != locty) { 632 break; 633 } 634 635 if (s->be_tpm_version == TPM_VERSION_2_0) { 636 /* some flags that are only supported for TPM 2 */ 637 if (val & TPM_TIS_STS_COMMAND_CANCEL) { 638 if (s->loc[locty].state == TPM_TIS_STATE_EXECUTION) { 639 /* 640 * request the backend to cancel. Some backends may not 641 * support it 642 */ 643 tpm_backend_cancel_cmd(s->be_driver); 644 } 645 } 646 647 if (val & TPM_TIS_STS_RESET_ESTABLISHMENT_BIT) { 648 if (locty == 3 || locty == 4) { 649 tpm_backend_reset_tpm_established_flag(s->be_driver, locty); 650 } 651 } 652 } 653 654 val &= (TPM_TIS_STS_COMMAND_READY | TPM_TIS_STS_TPM_GO | 655 TPM_TIS_STS_RESPONSE_RETRY); 656 657 if (val == TPM_TIS_STS_COMMAND_READY) { 658 switch (s->loc[locty].state) { 659 660 case TPM_TIS_STATE_READY: 661 s->rw_offset = 0; 662 break; 663 664 case TPM_TIS_STATE_IDLE: 665 tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_COMMAND_READY); 666 s->loc[locty].state = TPM_TIS_STATE_READY; 667 tpm_tis_raise_irq(s, locty, TPM_TIS_INT_COMMAND_READY); 668 break; 669 670 case TPM_TIS_STATE_EXECUTION: 671 case TPM_TIS_STATE_RECEPTION: 672 /* abort currently running command */ 673 trace_tpm_tis_mmio_write_init_abort(); 674 tpm_tis_prep_abort(s, locty, locty); 675 break; 676 677 case TPM_TIS_STATE_COMPLETION: 678 s->rw_offset = 0; 679 /* shortcut to ready state with C/R set */ 680 s->loc[locty].state = TPM_TIS_STATE_READY; 681 if (!(s->loc[locty].sts & TPM_TIS_STS_COMMAND_READY)) { 682 tpm_tis_sts_set(&s->loc[locty], 683 TPM_TIS_STS_COMMAND_READY); 684 tpm_tis_raise_irq(s, locty, TPM_TIS_INT_COMMAND_READY); 685 } 686 s->loc[locty].sts &= ~(TPM_TIS_STS_DATA_AVAILABLE); 687 break; 688 689 } 690 } else if (val == TPM_TIS_STS_TPM_GO) { 691 switch (s->loc[locty].state) { 692 case TPM_TIS_STATE_RECEPTION: 693 if ((s->loc[locty].sts & TPM_TIS_STS_EXPECT) == 0) { 694 tpm_tis_tpm_send(s, locty); 695 } 696 break; 697 default: 698 /* ignore */ 699 break; 700 } 701 } else if (val == TPM_TIS_STS_RESPONSE_RETRY) { 702 switch (s->loc[locty].state) { 703 case TPM_TIS_STATE_COMPLETION: 704 s->rw_offset = 0; 705 tpm_tis_sts_set(&s->loc[locty], 706 TPM_TIS_STS_VALID| 707 TPM_TIS_STS_DATA_AVAILABLE); 708 break; 709 default: 710 /* ignore */ 711 break; 712 } 713 } 714 break; 715 case TPM_TIS_REG_DATA_FIFO: 716 case TPM_TIS_REG_DATA_XFIFO ... TPM_TIS_REG_DATA_XFIFO_END: 717 /* data fifo */ 718 if (s->active_locty != locty) { 719 break; 720 } 721 722 if (s->loc[locty].state == TPM_TIS_STATE_IDLE || 723 s->loc[locty].state == TPM_TIS_STATE_EXECUTION || 724 s->loc[locty].state == TPM_TIS_STATE_COMPLETION) { 725 /* drop the byte */ 726 } else { 727 trace_tpm_tis_mmio_write_data2send(val, size); 728 if (s->loc[locty].state == TPM_TIS_STATE_READY) { 729 s->loc[locty].state = TPM_TIS_STATE_RECEPTION; 730 tpm_tis_sts_set(&s->loc[locty], 731 TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID); 732 } 733 734 val >>= shift; 735 if (size > 4 - (addr & 0x3)) { 736 /* prevent access beyond FIFO */ 737 size = 4 - (addr & 0x3); 738 } 739 740 while ((s->loc[locty].sts & TPM_TIS_STS_EXPECT) && size > 0) { 741 if (s->rw_offset < s->be_buffer_size) { 742 s->buffer[s->rw_offset++] = 743 (uint8_t)val; 744 val >>= 8; 745 size--; 746 } else { 747 tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID); 748 } 749 } 750 751 /* check for complete packet */ 752 if (s->rw_offset > 5 && 753 (s->loc[locty].sts & TPM_TIS_STS_EXPECT)) { 754 /* we have a packet length - see if we have all of it */ 755 bool need_irq = !(s->loc[locty].sts & TPM_TIS_STS_VALID); 756 757 len = tpm_cmd_get_size(&s->buffer); 758 if (len > s->rw_offset) { 759 tpm_tis_sts_set(&s->loc[locty], 760 TPM_TIS_STS_EXPECT | TPM_TIS_STS_VALID); 761 } else { 762 /* packet complete */ 763 tpm_tis_sts_set(&s->loc[locty], TPM_TIS_STS_VALID); 764 } 765 if (need_irq) { 766 tpm_tis_raise_irq(s, locty, TPM_TIS_INT_STS_VALID); 767 } 768 } 769 } 770 break; 771 case TPM_TIS_REG_INTERFACE_ID: 772 if (val & TPM_TIS_IFACE_ID_INT_SEL_LOCK) { 773 for (l = 0; l < TPM_TIS_NUM_LOCALITIES; l++) { 774 s->loc[l].iface_id |= TPM_TIS_IFACE_ID_INT_SEL_LOCK; 775 } 776 } 777 break; 778 } 779 } 780 781 /* 782 * A wrapper write function so that it can be directly called without 783 * mmio. 784 */ 785 void tpm_tis_write_data(TPMState *s, hwaddr addr, uint64_t val, uint32_t size) 786 { 787 tpm_tis_mmio_write(s, addr, val, size); 788 } 789 790 const MemoryRegionOps tpm_tis_memory_ops = { 791 .read = tpm_tis_mmio_read, 792 .write = tpm_tis_mmio_write, 793 .endianness = DEVICE_LITTLE_ENDIAN, 794 .valid = { 795 .min_access_size = 1, 796 .max_access_size = 4, 797 }, 798 }; 799 800 /* 801 * Get the TPMVersion of the backend device being used 802 */ 803 enum TPMVersion tpm_tis_get_tpm_version(TPMState *s) 804 { 805 if (tpm_backend_had_startup_error(s->be_driver)) { 806 return TPM_VERSION_UNSPEC; 807 } 808 809 return tpm_backend_get_tpm_version(s->be_driver); 810 } 811 812 /* 813 * This function is called when the machine starts, resets or due to 814 * S3 resume. 815 */ 816 void tpm_tis_reset(TPMState *s) 817 { 818 int c; 819 820 s->be_tpm_version = tpm_backend_get_tpm_version(s->be_driver); 821 s->be_buffer_size = MIN(tpm_backend_get_buffer_size(s->be_driver), 822 TPM_TIS_BUFFER_MAX); 823 824 if (s->ppi_enabled) { 825 tpm_ppi_reset(&s->ppi); 826 } 827 tpm_backend_reset(s->be_driver); 828 829 s->active_locty = TPM_TIS_NO_LOCALITY; 830 s->next_locty = TPM_TIS_NO_LOCALITY; 831 s->aborting_locty = TPM_TIS_NO_LOCALITY; 832 833 for (c = 0; c < TPM_TIS_NUM_LOCALITIES; c++) { 834 s->loc[c].access = TPM_TIS_ACCESS_TPM_REG_VALID_STS; 835 switch (s->be_tpm_version) { 836 case TPM_VERSION_UNSPEC: 837 break; 838 case TPM_VERSION_1_2: 839 s->loc[c].sts = TPM_TIS_STS_TPM_FAMILY1_2; 840 s->loc[c].iface_id = TPM_TIS_IFACE_ID_SUPPORTED_FLAGS1_3; 841 break; 842 case TPM_VERSION_2_0: 843 s->loc[c].sts = TPM_TIS_STS_TPM_FAMILY2_0; 844 s->loc[c].iface_id = TPM_TIS_IFACE_ID_SUPPORTED_FLAGS2_0; 845 break; 846 } 847 s->loc[c].inte = TPM_TIS_INT_POLARITY_LOW_LEVEL; 848 s->loc[c].ints = 0; 849 s->loc[c].state = TPM_TIS_STATE_IDLE; 850 851 s->rw_offset = 0; 852 } 853 854 if (tpm_backend_startup_tpm(s->be_driver, s->be_buffer_size) < 0) { 855 exit(1); 856 } 857 } 858 859 /* persistent state handling */ 860 861 int tpm_tis_pre_save(TPMState *s) 862 { 863 uint8_t locty = s->active_locty; 864 865 trace_tpm_tis_pre_save(locty, s->rw_offset); 866 867 if (DEBUG_TIS) { 868 tpm_tis_dump_state(s, 0); 869 } 870 871 /* 872 * Synchronize with backend completion. 873 */ 874 tpm_backend_finish_sync(s->be_driver); 875 876 return 0; 877 } 878 879 const VMStateDescription vmstate_locty = { 880 .name = "tpm-tis/locty", 881 .version_id = 0, 882 .fields = (const VMStateField[]) { 883 VMSTATE_UINT32(state, TPMLocality), 884 VMSTATE_UINT32(inte, TPMLocality), 885 VMSTATE_UINT32(ints, TPMLocality), 886 VMSTATE_UINT8(access, TPMLocality), 887 VMSTATE_UINT32(sts, TPMLocality), 888 VMSTATE_UINT32(iface_id, TPMLocality), 889 VMSTATE_END_OF_LIST(), 890 } 891 }; 892 893