Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ipmi/ipmi_kcs.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2006 IronPort Systems Inc. <ambrisko@ironport.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/condvar.h> 37 #include <sys/eventhandler.h> 38 #include <sys/kernel.h> 39 #include <sys/kthread.h> 40 #include <sys/rman.h> 41 #include <sys/selinfo.h> 42 #include <machine/bus.h> 43 44 #ifdef LOCAL_MODULE 45 #include <ipmi.h> 46 #include <ipmivars.h> 47 #else 48 #include <sys/ipmi.h> 49 #include <dev/ipmi/ipmivars.h> 50 #endif 51 52 #define POLLING_DELAY_MIN 4 /* Waits are 2-3 usecs on typical systems */ 53 #define POLLING_DELAY_MAX 256 54 55 static void kcs_clear_obf(struct ipmi_softc *, int); 56 static void kcs_error(struct ipmi_softc *); 57 static int kcs_wait_for_ibf(struct ipmi_softc *, bool); 58 static int kcs_wait_for_obf(struct ipmi_softc *, bool); 59 60 static int 61 kcs_wait(struct ipmi_softc *sc, int value, int mask) 62 { 63 int status, start = ticks; 64 int delay_usec = POLLING_DELAY_MIN; 65 66 status = INB(sc, KCS_CTL_STS); 67 while (ticks - start < MAX_TIMEOUT && (status & mask) != value) { 68 /* 69 * The wait delay is increased exponentially to avoid putting 70 * significant load on I/O bus. 71 */ 72 DELAY(delay_usec); 73 status = INB(sc, KCS_CTL_STS); 74 if (delay_usec < POLLING_DELAY_MAX) 75 delay_usec *= 2; 76 } 77 return (status); 78 } 79 80 static int 81 kcs_wait_for_ibf(struct ipmi_softc *sc, bool level) 82 { 83 84 return (kcs_wait(sc, level ? KCS_STATUS_IBF : 0, KCS_STATUS_IBF)); 85 } 86 87 static int 88 kcs_wait_for_obf(struct ipmi_softc *sc, bool level) 89 { 90 91 return (kcs_wait(sc, level ? KCS_STATUS_OBF : 0, KCS_STATUS_OBF)); 92 } 93 94 static void 95 kcs_clear_obf(struct ipmi_softc *sc, int status) 96 { 97 98 /* Clear OBF */ 99 if (status & KCS_STATUS_OBF) { 100 INB(sc, KCS_DATA); 101 } 102 } 103 104 static void 105 kcs_error(struct ipmi_softc *sc) 106 { 107 int retry, status; 108 u_char data; 109 110 for (retry = 0; retry < 2; retry++) { 111 112 /* Wait for IBF = 0 */ 113 status = kcs_wait_for_ibf(sc, 0); 114 115 /* ABORT */ 116 OUTB(sc, KCS_CTL_STS, KCS_CONTROL_GET_STATUS_ABORT); 117 118 /* Wait for IBF = 0 */ 119 status = kcs_wait_for_ibf(sc, 0); 120 121 /* Clear OBF */ 122 kcs_clear_obf(sc, status); 123 124 if (status & KCS_STATUS_OBF) { 125 data = INB(sc, KCS_DATA); 126 if (data != 0) 127 device_printf(sc->ipmi_dev, 128 "KCS Error Data %02x\n", data); 129 } 130 131 /* 0x00 to DATA_IN */ 132 OUTB(sc, KCS_DATA, 0x00); 133 134 /* Wait for IBF = 0 */ 135 status = kcs_wait_for_ibf(sc, 0); 136 137 if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_READ) { 138 139 /* Wait for OBF = 1 */ 140 status = kcs_wait_for_obf(sc, 1); 141 142 /* Read error status */ 143 data = INB(sc, KCS_DATA); 144 if (data != 0 && (data != 0xff || bootverbose)) 145 device_printf(sc->ipmi_dev, "KCS error: %02x\n", 146 data); 147 148 /* Write READ into Data_in */ 149 OUTB(sc, KCS_DATA, KCS_DATA_IN_READ); 150 151 /* Wait for IBF = 0 */ 152 status = kcs_wait_for_ibf(sc, 0); 153 } 154 155 /* IDLE STATE */ 156 if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_IDLE) { 157 /* Wait for OBF = 1 */ 158 status = kcs_wait_for_obf(sc, 1); 159 160 /* Clear OBF */ 161 kcs_clear_obf(sc, status); 162 return; 163 } 164 } 165 device_printf(sc->ipmi_dev, "KCS: Error retry exhausted\n"); 166 } 167 168 /* 169 * Start to write a request. Waits for IBF to clear and then sends the 170 * WR_START command. 171 */ 172 static int 173 kcs_start_write(struct ipmi_softc *sc) 174 { 175 int retry, status; 176 177 for (retry = 0; retry < 10; retry++) { 178 /* Wait for IBF = 0 */ 179 status = kcs_wait_for_ibf(sc, 0); 180 if (status & KCS_STATUS_IBF) 181 return (0); 182 183 /* Clear OBF */ 184 kcs_clear_obf(sc, status); 185 186 /* Write start to command */ 187 OUTB(sc, KCS_CTL_STS, KCS_CONTROL_WRITE_START); 188 189 /* Wait for IBF = 0 */ 190 status = kcs_wait_for_ibf(sc, 0); 191 if (status & KCS_STATUS_IBF) 192 return (0); 193 194 if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_WRITE) 195 break; 196 DELAY(1000000); 197 } 198 199 if (KCS_STATUS_STATE(status) != KCS_STATUS_STATE_WRITE) 200 /* error state */ 201 return (0); 202 203 /* Clear OBF */ 204 kcs_clear_obf(sc, status); 205 206 return (1); 207 } 208 209 /* 210 * Write a byte of the request message, excluding the last byte of the 211 * message which requires special handling. 212 */ 213 static int 214 kcs_write_byte(struct ipmi_softc *sc, u_char data) 215 { 216 int status; 217 218 /* Data to Data */ 219 OUTB(sc, KCS_DATA, data); 220 221 /* Wait for IBF = 0 */ 222 status = kcs_wait_for_ibf(sc, 0); 223 if (status & KCS_STATUS_IBF) 224 return (0); 225 226 if (KCS_STATUS_STATE(status) != KCS_STATUS_STATE_WRITE) 227 return (0); 228 229 /* Clear OBF */ 230 kcs_clear_obf(sc, status); 231 return (1); 232 } 233 234 /* 235 * Write the last byte of a request message. 236 */ 237 static int 238 kcs_write_last_byte(struct ipmi_softc *sc, u_char data) 239 { 240 int status; 241 242 /* Write end to command */ 243 OUTB(sc, KCS_CTL_STS, KCS_CONTROL_WRITE_END); 244 245 /* Wait for IBF = 0 */ 246 status = kcs_wait_for_ibf(sc, 0); 247 if (status & KCS_STATUS_IBF) 248 return (0); 249 250 if (KCS_STATUS_STATE(status) != KCS_STATUS_STATE_WRITE) 251 /* error state */ 252 return (0); 253 254 /* Clear OBF */ 255 kcs_clear_obf(sc, status); 256 257 /* Send data byte to DATA. */ 258 OUTB(sc, KCS_DATA, data); 259 return (1); 260 } 261 262 /* 263 * Read one byte of the reply message. 264 */ 265 static int 266 kcs_read_byte(struct ipmi_softc *sc, u_char *data) 267 { 268 int status; 269 270 /* Wait for IBF = 0 */ 271 status = kcs_wait_for_ibf(sc, 0); 272 273 /* Read State */ 274 if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_READ) { 275 276 /* Wait for OBF = 1 */ 277 status = kcs_wait_for_obf(sc, 1); 278 if ((status & KCS_STATUS_OBF) == 0) 279 return (0); 280 281 /* Read Data_out */ 282 *data = INB(sc, KCS_DATA); 283 284 /* Write READ into Data_in */ 285 OUTB(sc, KCS_DATA, KCS_DATA_IN_READ); 286 return (1); 287 } 288 289 /* Idle State */ 290 if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_IDLE) { 291 292 /* Wait for OBF = 1*/ 293 status = kcs_wait_for_obf(sc, 1); 294 if ((status & KCS_STATUS_OBF) == 0) 295 return (0); 296 297 /* Read Dummy */ 298 INB(sc, KCS_DATA); 299 return (2); 300 } 301 302 /* Error State */ 303 return (0); 304 } 305 306 /* 307 * Send a request message and collect the reply. Returns true if we 308 * succeed. 309 */ 310 static int 311 kcs_polled_request(struct ipmi_softc *sc, struct ipmi_request *req) 312 { 313 u_char *cp, data; 314 int i, state; 315 316 IPMI_IO_LOCK(sc); 317 318 /* Send the request. */ 319 if (!kcs_start_write(sc)) { 320 device_printf(sc->ipmi_dev, "KCS: Failed to start write\n"); 321 goto fail; 322 } 323 #ifdef KCS_DEBUG 324 device_printf(sc->ipmi_dev, "KCS: WRITE_START... ok\n"); 325 #endif 326 327 if (!kcs_write_byte(sc, req->ir_addr)) { 328 device_printf(sc->ipmi_dev, "KCS: Failed to write address\n"); 329 goto fail; 330 } 331 #ifdef KCS_DEBUG 332 device_printf(sc->ipmi_dev, "KCS: Wrote address: %02x\n", req->ir_addr); 333 #endif 334 335 if (req->ir_requestlen == 0) { 336 if (!kcs_write_last_byte(sc, req->ir_command)) { 337 device_printf(sc->ipmi_dev, 338 "KCS: Failed to write command\n"); 339 goto fail; 340 } 341 #ifdef KCS_DEBUG 342 device_printf(sc->ipmi_dev, "KCS: Wrote command: %02x\n", 343 req->ir_command); 344 #endif 345 } else { 346 if (!kcs_write_byte(sc, req->ir_command)) { 347 device_printf(sc->ipmi_dev, 348 "KCS: Failed to write command\n"); 349 goto fail; 350 } 351 #ifdef KCS_DEBUG 352 device_printf(sc->ipmi_dev, "KCS: Wrote command: %02x\n", 353 req->ir_command); 354 #endif 355 356 cp = req->ir_request; 357 for (i = 0; i < req->ir_requestlen - 1; i++) { 358 if (!kcs_write_byte(sc, *cp++)) { 359 device_printf(sc->ipmi_dev, 360 "KCS: Failed to write data byte %d\n", 361 i + 1); 362 goto fail; 363 } 364 #ifdef KCS_DEBUG 365 device_printf(sc->ipmi_dev, "KCS: Wrote data: %02x\n", 366 cp[-1]); 367 #endif 368 } 369 370 if (!kcs_write_last_byte(sc, *cp)) { 371 device_printf(sc->ipmi_dev, 372 "KCS: Failed to write last dta byte\n"); 373 goto fail; 374 } 375 #ifdef KCS_DEBUG 376 device_printf(sc->ipmi_dev, "KCS: Wrote last data: %02x\n", 377 *cp); 378 #endif 379 } 380 381 /* Read the reply. First, read the NetFn/LUN. */ 382 if (kcs_read_byte(sc, &data) != 1) { 383 device_printf(sc->ipmi_dev, "KCS: Failed to read address\n"); 384 goto fail; 385 } 386 #ifdef KCS_DEBUG 387 device_printf(sc->ipmi_dev, "KCS: Read address: %02x\n", data); 388 #endif 389 if (data != IPMI_REPLY_ADDR(req->ir_addr)) { 390 device_printf(sc->ipmi_dev, "KCS: Reply address mismatch\n"); 391 goto fail; 392 } 393 394 /* Next we read the command. */ 395 if (kcs_read_byte(sc, &data) != 1) { 396 device_printf(sc->ipmi_dev, "KCS: Failed to read command\n"); 397 goto fail; 398 } 399 #ifdef KCS_DEBUG 400 device_printf(sc->ipmi_dev, "KCS: Read command: %02x\n", data); 401 #endif 402 if (data != req->ir_command) { 403 device_printf(sc->ipmi_dev, "KCS: Command mismatch\n"); 404 goto fail; 405 } 406 407 /* Next we read the completion code. */ 408 if (kcs_read_byte(sc, &req->ir_compcode) != 1) { 409 if (bootverbose) { 410 device_printf(sc->ipmi_dev, 411 "KCS: Failed to read completion code\n"); 412 } 413 goto fail; 414 } 415 #ifdef KCS_DEBUG 416 device_printf(sc->ipmi_dev, "KCS: Read completion code: %02x\n", 417 req->ir_compcode); 418 #endif 419 420 /* Finally, read the reply from the BMC. */ 421 i = 0; 422 for (;;) { 423 state = kcs_read_byte(sc, &data); 424 if (state == 0) { 425 device_printf(sc->ipmi_dev, 426 "KCS: Read failed on byte %d\n", i + 1); 427 goto fail; 428 } 429 if (state == 2) 430 break; 431 if (i < req->ir_replybuflen) { 432 req->ir_reply[i] = data; 433 #ifdef KCS_DEBUG 434 device_printf(sc->ipmi_dev, "KCS: Read data %02x\n", 435 data); 436 } else { 437 device_printf(sc->ipmi_dev, 438 "KCS: Read short %02x byte %d\n", data, i + 1); 439 #endif 440 } 441 i++; 442 } 443 IPMI_IO_UNLOCK(sc); 444 req->ir_replylen = i; 445 #ifdef KCS_DEBUG 446 device_printf(sc->ipmi_dev, "KCS: READ finished (%d bytes)\n", i); 447 if (req->ir_replybuflen < i) 448 #else 449 if (req->ir_replybuflen < i && req->ir_replybuflen != 0) 450 #endif 451 device_printf(sc->ipmi_dev, 452 "KCS: Read short: %zd buffer, %d actual\n", 453 req->ir_replybuflen, i); 454 return (1); 455 fail: 456 kcs_error(sc); 457 IPMI_IO_UNLOCK(sc); 458 return (0); 459 } 460 461 static void 462 kcs_loop(void *arg) 463 { 464 struct ipmi_softc *sc = arg; 465 struct ipmi_request *req; 466 int i, ok; 467 468 IPMI_LOCK(sc); 469 while ((req = ipmi_dequeue_request(sc)) != NULL) { 470 IPMI_UNLOCK(sc); 471 ok = 0; 472 for (i = 0; i < 3 && !ok; i++) 473 ok = kcs_polled_request(sc, req); 474 if (ok) 475 req->ir_error = 0; 476 else 477 req->ir_error = EIO; 478 IPMI_LOCK(sc); 479 ipmi_complete_request(sc, req); 480 } 481 IPMI_UNLOCK(sc); 482 kproc_exit(0); 483 } 484 485 static int 486 kcs_startup(struct ipmi_softc *sc) 487 { 488 489 return (kproc_create(kcs_loop, sc, &sc->ipmi_kthread, 0, 0, "%s: kcs", 490 device_get_nameunit(sc->ipmi_dev))); 491 } 492 493 static int 494 kcs_driver_request_queue(struct ipmi_softc *sc, struct ipmi_request *req, int timo) 495 { 496 int error; 497 498 IPMI_LOCK(sc); 499 ipmi_polled_enqueue_request_highpri(sc, req); 500 error = msleep(req, &sc->ipmi_requests_lock, 0, "ipmireq", timo); 501 if (error == 0) 502 error = req->ir_error; 503 IPMI_UNLOCK(sc); 504 return (error); 505 } 506 507 static int 508 kcs_driver_request_poll(struct ipmi_softc *sc, struct ipmi_request *req) 509 { 510 int i, ok; 511 512 ok = 0; 513 for (i = 0; i < 3 && !ok; i++) 514 ok = kcs_polled_request(sc, req); 515 if (ok) 516 req->ir_error = 0; 517 else 518 req->ir_error = EIO; 519 return (req->ir_error); 520 } 521 522 static int 523 kcs_driver_request(struct ipmi_softc *sc, struct ipmi_request *req, int timo) 524 { 525 526 if (KERNEL_PANICKED() || dumping) 527 return (kcs_driver_request_poll(sc, req)); 528 else 529 return (kcs_driver_request_queue(sc, req, timo)); 530 } 531 532 533 int 534 ipmi_kcs_attach(struct ipmi_softc *sc) 535 { 536 int status; 537 538 /* Setup function pointers. */ 539 sc->ipmi_startup = kcs_startup; 540 sc->ipmi_enqueue_request = ipmi_polled_enqueue_request; 541 sc->ipmi_driver_request = kcs_driver_request; 542 sc->ipmi_driver_requests_polled = 1; 543 544 /* See if we can talk to the controller. */ 545 status = INB(sc, KCS_CTL_STS); 546 if (status == 0xff) { 547 device_printf(sc->ipmi_dev, "couldn't find it\n"); 548 return (ENXIO); 549 } 550 551 #ifdef KCS_DEBUG 552 device_printf(sc->ipmi_dev, "KCS: initial state: %02x\n", status); 553 #endif 554 if (status & KCS_STATUS_OBF || 555 KCS_STATUS_STATE(status) != KCS_STATUS_STATE_IDLE) 556 kcs_error(sc); 557 558 return (0); 559 } 560 561 /* 562 * Determine the alignment automatically for a PCI attachment. In this case, 563 * any unused bytes will return 0x00 when read. We make use of the C/D bit 564 * in the CTL_STS register to try to start a GET_STATUS transaction. When 565 * we write the command, that bit should be set, so we should get a non-zero 566 * value back when we read CTL_STS if the offset we are testing is the CTL_STS 567 * register. 568 */ 569 int 570 ipmi_kcs_probe_align(struct ipmi_softc *sc) 571 { 572 int status; 573 574 sc->ipmi_io_spacing = 1; 575 retry: 576 #ifdef KCS_DEBUG 577 device_printf(sc->ipmi_dev, "Trying KCS align %d... ", sc->ipmi_io_spacing); 578 #endif 579 580 /* Wait for IBF = 0 */ 581 status = INB(sc, KCS_CTL_STS); 582 while (status & KCS_STATUS_IBF) { 583 DELAY(100); 584 status = INB(sc, KCS_CTL_STS); 585 } 586 587 OUTB(sc, KCS_CTL_STS, KCS_CONTROL_GET_STATUS_ABORT); 588 589 /* Wait for IBF = 0 */ 590 status = INB(sc, KCS_CTL_STS); 591 while (status & KCS_STATUS_IBF) { 592 DELAY(100); 593 status = INB(sc, KCS_CTL_STS); 594 } 595 596 /* If we got 0x00 back, then this must not be the CTL_STS register. */ 597 if (status == 0) { 598 #ifdef KCS_DEBUG 599 printf("failed\n"); 600 #endif 601 sc->ipmi_io_spacing <<= 1; 602 if (sc->ipmi_io_spacing > 4) 603 return (0); 604 goto retry; 605 } 606 #ifdef KCS_DEBUG 607 printf("ok\n"); 608 #endif 609 610 /* Finish out the transaction. */ 611 612 /* Clear OBF */ 613 if (status & KCS_STATUS_OBF) 614 INB(sc, KCS_DATA); 615 616 /* 0x00 to DATA_IN */ 617 OUTB(sc, KCS_DATA, 0); 618 619 /* Wait for IBF = 0 */ 620 status = INB(sc, KCS_CTL_STS); 621 while (status & KCS_STATUS_IBF) { 622 DELAY(100); 623 status = INB(sc, KCS_CTL_STS); 624 } 625 626 if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_READ) { 627 /* Wait for IBF = 1 */ 628 while (!(status & KCS_STATUS_OBF)) { 629 DELAY(100); 630 status = INB(sc, KCS_CTL_STS); 631 } 632 633 /* Read error status. */ 634 INB(sc, KCS_DATA); 635 636 /* Write dummy READ to DATA_IN. */ 637 OUTB(sc, KCS_DATA, KCS_DATA_IN_READ); 638 639 /* Wait for IBF = 0 */ 640 status = INB(sc, KCS_CTL_STS); 641 while (status & KCS_STATUS_IBF) { 642 DELAY(100); 643 status = INB(sc, KCS_CTL_STS); 644 } 645 } 646 647 if (KCS_STATUS_STATE(status) == KCS_STATUS_STATE_IDLE) { 648 /* Wait for IBF = 1 */ 649 while (!(status & KCS_STATUS_OBF)) { 650 DELAY(100); 651 status = INB(sc, KCS_CTL_STS); 652 } 653 654 /* Clear OBF */ 655 if (status & KCS_STATUS_OBF) 656 INB(sc, KCS_DATA); 657 } else 658 device_printf(sc->ipmi_dev, "KCS probe: end state %x\n", 659 KCS_STATUS_STATE(status)); 660 661 return (1); 662 }
Cache object: 378a6240160c05f7baf82b94cab5a1b1
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