Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/ipmi/ipmi.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/condvar.h> 36 #include <sys/conf.h> 37 #include <sys/eventhandler.h> 38 #include <sys/kernel.h> 39 #include <sys/lock.h> 40 #include <sys/malloc.h> 41 #include <sys/module.h> 42 #include <sys/mutex.h> 43 #include <sys/poll.h> 44 #include <sys/reboot.h> 45 #include <sys/rman.h> 46 #include <sys/selinfo.h> 47 #include <sys/sysctl.h> 48 #include <sys/watchdog.h> 49 50 #ifdef LOCAL_MODULE 51 #include <ipmi.h> 52 #include <ipmivars.h> 53 #else 54 #include <sys/ipmi.h> 55 #include <dev/ipmi/ipmivars.h> 56 #endif 57 58 #ifdef IPMICTL_SEND_COMMAND_32 59 #include <sys/abi_compat.h> 60 #endif 61 62 /* 63 * Driver request structures are allocated on the stack via alloca() to 64 * avoid calling malloc(), especially for the watchdog handler. 65 * To avoid too much stack growth, a previously allocated structure can 66 * be reused via IPMI_INIT_DRIVER_REQUEST(), but the caller should ensure 67 * that there is adequate reply/request space in the original allocation. 68 */ 69 #define IPMI_INIT_DRIVER_REQUEST(req, addr, cmd, reqlen, replylen) \ 70 bzero((req), sizeof(struct ipmi_request)); \ 71 ipmi_init_request((req), NULL, 0, (addr), (cmd), (reqlen), (replylen)) 72 73 #define IPMI_ALLOC_DRIVER_REQUEST(req, addr, cmd, reqlen, replylen) \ 74 (req) = __builtin_alloca(sizeof(struct ipmi_request) + \ 75 (reqlen) + (replylen)); \ 76 IPMI_INIT_DRIVER_REQUEST((req), (addr), (cmd), (reqlen), \ 77 (replylen)) 78 79 static d_ioctl_t ipmi_ioctl; 80 static d_poll_t ipmi_poll; 81 static d_open_t ipmi_open; 82 static void ipmi_dtor(void *arg); 83 84 int ipmi_attached = 0; 85 86 static int on = 1; 87 static bool wd_in_shutdown = false; 88 static int wd_timer_actions = IPMI_SET_WD_ACTION_POWER_CYCLE; 89 static int wd_shutdown_countdown = 0; /* sec */ 90 static int wd_startup_countdown = 0; /* sec */ 91 static int wd_pretimeout_countdown = 120; /* sec */ 92 static int cycle_wait = 10; /* sec */ 93 static int wd_init_enable = 1; 94 95 static SYSCTL_NODE(_hw, OID_AUTO, ipmi, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 96 "IPMI driver parameters"); 97 SYSCTL_INT(_hw_ipmi, OID_AUTO, on, CTLFLAG_RWTUN, 98 &on, 0, ""); 99 SYSCTL_INT(_hw_ipmi, OID_AUTO, wd_init_enable, CTLFLAG_RWTUN, 100 &wd_init_enable, 1, "Enable watchdog initialization"); 101 SYSCTL_INT(_hw_ipmi, OID_AUTO, wd_timer_actions, CTLFLAG_RWTUN, 102 &wd_timer_actions, 0, 103 "IPMI watchdog timer actions (including pre-timeout interrupt)"); 104 SYSCTL_INT(_hw_ipmi, OID_AUTO, wd_shutdown_countdown, CTLFLAG_RWTUN, 105 &wd_shutdown_countdown, 0, 106 "IPMI watchdog countdown for shutdown (seconds)"); 107 SYSCTL_INT(_hw_ipmi, OID_AUTO, wd_startup_countdown, CTLFLAG_RDTUN, 108 &wd_startup_countdown, 0, 109 "IPMI watchdog countdown initialized during startup (seconds)"); 110 SYSCTL_INT(_hw_ipmi, OID_AUTO, wd_pretimeout_countdown, CTLFLAG_RWTUN, 111 &wd_pretimeout_countdown, 0, 112 "IPMI watchdog pre-timeout countdown (seconds)"); 113 SYSCTL_INT(_hw_ipmi, OID_AUTO, cycle_wait, CTLFLAG_RWTUN, 114 &cycle_wait, 0, 115 "IPMI power cycle on reboot delay time (seconds)"); 116 117 static struct cdevsw ipmi_cdevsw = { 118 .d_version = D_VERSION, 119 .d_open = ipmi_open, 120 .d_ioctl = ipmi_ioctl, 121 .d_poll = ipmi_poll, 122 .d_name = "ipmi", 123 }; 124 125 static MALLOC_DEFINE(M_IPMI, "ipmi", "ipmi"); 126 127 static int 128 ipmi_open(struct cdev *cdev, int flags, int fmt, struct thread *td) 129 { 130 struct ipmi_device *dev; 131 struct ipmi_softc *sc; 132 int error; 133 134 if (!on) 135 return (ENOENT); 136 137 /* Initialize the per file descriptor data. */ 138 dev = malloc(sizeof(struct ipmi_device), M_IPMI, M_WAITOK | M_ZERO); 139 error = devfs_set_cdevpriv(dev, ipmi_dtor); 140 if (error) { 141 free(dev, M_IPMI); 142 return (error); 143 } 144 145 sc = cdev->si_drv1; 146 TAILQ_INIT(&dev->ipmi_completed_requests); 147 dev->ipmi_address = IPMI_BMC_SLAVE_ADDR; 148 dev->ipmi_lun = IPMI_BMC_SMS_LUN; 149 dev->ipmi_softc = sc; 150 IPMI_LOCK(sc); 151 sc->ipmi_opened++; 152 IPMI_UNLOCK(sc); 153 154 return (0); 155 } 156 157 static int 158 ipmi_poll(struct cdev *cdev, int poll_events, struct thread *td) 159 { 160 struct ipmi_device *dev; 161 struct ipmi_softc *sc; 162 int revents = 0; 163 164 if (devfs_get_cdevpriv((void **)&dev)) 165 return (0); 166 167 sc = cdev->si_drv1; 168 IPMI_LOCK(sc); 169 if (poll_events & (POLLIN | POLLRDNORM)) { 170 if (!TAILQ_EMPTY(&dev->ipmi_completed_requests)) 171 revents |= poll_events & (POLLIN | POLLRDNORM); 172 if (dev->ipmi_requests == 0) 173 revents |= POLLERR; 174 } 175 176 if (revents == 0) { 177 if (poll_events & (POLLIN | POLLRDNORM)) 178 selrecord(td, &dev->ipmi_select); 179 } 180 IPMI_UNLOCK(sc); 181 182 return (revents); 183 } 184 185 static void 186 ipmi_purge_completed_requests(struct ipmi_device *dev) 187 { 188 struct ipmi_request *req; 189 190 while (!TAILQ_EMPTY(&dev->ipmi_completed_requests)) { 191 req = TAILQ_FIRST(&dev->ipmi_completed_requests); 192 TAILQ_REMOVE(&dev->ipmi_completed_requests, req, ir_link); 193 dev->ipmi_requests--; 194 ipmi_free_request(req); 195 } 196 } 197 198 static void 199 ipmi_dtor(void *arg) 200 { 201 struct ipmi_request *req, *nreq; 202 struct ipmi_device *dev; 203 struct ipmi_softc *sc; 204 205 dev = arg; 206 sc = dev->ipmi_softc; 207 208 IPMI_LOCK(sc); 209 if (dev->ipmi_requests) { 210 /* Throw away any pending requests for this device. */ 211 TAILQ_FOREACH_SAFE(req, &sc->ipmi_pending_requests_highpri, ir_link, 212 nreq) { 213 if (req->ir_owner == dev) { 214 TAILQ_REMOVE(&sc->ipmi_pending_requests_highpri, req, 215 ir_link); 216 dev->ipmi_requests--; 217 ipmi_free_request(req); 218 } 219 } 220 TAILQ_FOREACH_SAFE(req, &sc->ipmi_pending_requests, ir_link, 221 nreq) { 222 if (req->ir_owner == dev) { 223 TAILQ_REMOVE(&sc->ipmi_pending_requests, req, 224 ir_link); 225 dev->ipmi_requests--; 226 ipmi_free_request(req); 227 } 228 } 229 230 /* Throw away any pending completed requests for this device. */ 231 ipmi_purge_completed_requests(dev); 232 233 /* 234 * If we still have outstanding requests, they must be stuck 235 * in an interface driver, so wait for those to drain. 236 */ 237 dev->ipmi_closing = 1; 238 while (dev->ipmi_requests > 0) { 239 msleep(&dev->ipmi_requests, &sc->ipmi_requests_lock, 240 PWAIT, "ipmidrain", 0); 241 ipmi_purge_completed_requests(dev); 242 } 243 } 244 sc->ipmi_opened--; 245 IPMI_UNLOCK(sc); 246 247 /* Cleanup. */ 248 free(dev, M_IPMI); 249 } 250 251 static u_char 252 ipmi_ipmb_checksum(u_char *data, int len) 253 { 254 u_char sum = 0; 255 256 for (; len; len--) 257 sum += *data++; 258 return (-sum); 259 } 260 261 static int 262 ipmi_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, 263 int flags, struct thread *td) 264 { 265 struct ipmi_softc *sc; 266 struct ipmi_device *dev; 267 struct ipmi_request *kreq; 268 struct ipmi_req *req = (struct ipmi_req *)data; 269 struct ipmi_recv *recv = (struct ipmi_recv *)data; 270 struct ipmi_addr addr; 271 #ifdef IPMICTL_SEND_COMMAND_32 272 struct ipmi_req32 *req32 = (struct ipmi_req32 *)data; 273 struct ipmi_recv32 *recv32 = (struct ipmi_recv32 *)data; 274 union { 275 struct ipmi_req req; 276 struct ipmi_recv recv; 277 } thunk32; 278 #endif 279 int error, len; 280 281 error = devfs_get_cdevpriv((void **)&dev); 282 if (error) 283 return (error); 284 285 sc = cdev->si_drv1; 286 287 #ifdef IPMICTL_SEND_COMMAND_32 288 /* Convert 32-bit structures to native. */ 289 switch (cmd) { 290 case IPMICTL_SEND_COMMAND_32: 291 req = &thunk32.req; 292 req->addr = PTRIN(req32->addr); 293 req->addr_len = req32->addr_len; 294 req->msgid = req32->msgid; 295 req->msg.netfn = req32->msg.netfn; 296 req->msg.cmd = req32->msg.cmd; 297 req->msg.data_len = req32->msg.data_len; 298 req->msg.data = PTRIN(req32->msg.data); 299 break; 300 case IPMICTL_RECEIVE_MSG_TRUNC_32: 301 case IPMICTL_RECEIVE_MSG_32: 302 recv = &thunk32.recv; 303 recv->addr = PTRIN(recv32->addr); 304 recv->addr_len = recv32->addr_len; 305 recv->msg.data_len = recv32->msg.data_len; 306 recv->msg.data = PTRIN(recv32->msg.data); 307 break; 308 } 309 #endif 310 311 switch (cmd) { 312 #ifdef IPMICTL_SEND_COMMAND_32 313 case IPMICTL_SEND_COMMAND_32: 314 #endif 315 case IPMICTL_SEND_COMMAND: 316 error = copyin(req->addr, &addr, sizeof(addr)); 317 if (error) 318 return (error); 319 320 if (addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) { 321 struct ipmi_system_interface_addr *saddr = 322 (struct ipmi_system_interface_addr *)&addr; 323 324 kreq = ipmi_alloc_request(dev, req->msgid, 325 IPMI_ADDR(req->msg.netfn, saddr->lun & 0x3), 326 req->msg.cmd, req->msg.data_len, IPMI_MAX_RX); 327 error = copyin(req->msg.data, kreq->ir_request, 328 req->msg.data_len); 329 if (error) { 330 ipmi_free_request(kreq); 331 return (error); 332 } 333 IPMI_LOCK(sc); 334 dev->ipmi_requests++; 335 error = sc->ipmi_enqueue_request(sc, kreq); 336 IPMI_UNLOCK(sc); 337 if (error) 338 return (error); 339 break; 340 } 341 342 /* Special processing for IPMB commands */ 343 struct ipmi_ipmb_addr *iaddr = (struct ipmi_ipmb_addr *)&addr; 344 345 IPMI_ALLOC_DRIVER_REQUEST(kreq, IPMI_ADDR(IPMI_APP_REQUEST, 0), 346 IPMI_SEND_MSG, req->msg.data_len + 8, IPMI_MAX_RX); 347 /* Construct the SEND MSG header */ 348 kreq->ir_request[0] = iaddr->channel; 349 kreq->ir_request[1] = iaddr->slave_addr; 350 kreq->ir_request[2] = IPMI_ADDR(req->msg.netfn, iaddr->lun); 351 kreq->ir_request[3] = 352 ipmi_ipmb_checksum(&kreq->ir_request[1], 2); 353 kreq->ir_request[4] = dev->ipmi_address; 354 kreq->ir_request[5] = IPMI_ADDR(0, dev->ipmi_lun); 355 kreq->ir_request[6] = req->msg.cmd; 356 /* Copy the message data */ 357 if (req->msg.data_len > 0) { 358 error = copyin(req->msg.data, &kreq->ir_request[7], 359 req->msg.data_len); 360 if (error != 0) 361 return (error); 362 } 363 kreq->ir_request[req->msg.data_len + 7] = 364 ipmi_ipmb_checksum(&kreq->ir_request[4], 365 req->msg.data_len + 3); 366 error = ipmi_submit_driver_request(sc, kreq, MAX_TIMEOUT); 367 if (error != 0) 368 return (error); 369 370 kreq = ipmi_alloc_request(dev, req->msgid, 371 IPMI_ADDR(IPMI_APP_REQUEST, 0), IPMI_GET_MSG, 372 0, IPMI_MAX_RX); 373 kreq->ir_ipmb = true; 374 kreq->ir_ipmb_addr = IPMI_ADDR(req->msg.netfn, 0); 375 kreq->ir_ipmb_command = req->msg.cmd; 376 IPMI_LOCK(sc); 377 dev->ipmi_requests++; 378 error = sc->ipmi_enqueue_request(sc, kreq); 379 IPMI_UNLOCK(sc); 380 if (error != 0) 381 return (error); 382 break; 383 #ifdef IPMICTL_SEND_COMMAND_32 384 case IPMICTL_RECEIVE_MSG_TRUNC_32: 385 case IPMICTL_RECEIVE_MSG_32: 386 #endif 387 case IPMICTL_RECEIVE_MSG_TRUNC: 388 case IPMICTL_RECEIVE_MSG: 389 error = copyin(recv->addr, &addr, sizeof(addr)); 390 if (error) 391 return (error); 392 393 IPMI_LOCK(sc); 394 kreq = TAILQ_FIRST(&dev->ipmi_completed_requests); 395 if (kreq == NULL) { 396 IPMI_UNLOCK(sc); 397 return (EAGAIN); 398 } 399 if (kreq->ir_error != 0) { 400 error = kreq->ir_error; 401 TAILQ_REMOVE(&dev->ipmi_completed_requests, kreq, 402 ir_link); 403 dev->ipmi_requests--; 404 IPMI_UNLOCK(sc); 405 ipmi_free_request(kreq); 406 return (error); 407 } 408 409 recv->recv_type = IPMI_RESPONSE_RECV_TYPE; 410 recv->msgid = kreq->ir_msgid; 411 if (kreq->ir_ipmb) { 412 addr.channel = IPMI_IPMB_CHANNEL; 413 recv->msg.netfn = 414 IPMI_REPLY_ADDR(kreq->ir_ipmb_addr) >> 2; 415 recv->msg.cmd = kreq->ir_ipmb_command; 416 /* Get the compcode of response */ 417 kreq->ir_compcode = kreq->ir_reply[6]; 418 /* Move the reply head past response header */ 419 kreq->ir_reply += 7; 420 len = kreq->ir_replylen - 7; 421 } else { 422 addr.channel = IPMI_BMC_CHANNEL; 423 recv->msg.netfn = IPMI_REPLY_ADDR(kreq->ir_addr) >> 2; 424 recv->msg.cmd = kreq->ir_command; 425 len = kreq->ir_replylen + 1; 426 } 427 428 if (recv->msg.data_len < len && 429 (cmd == IPMICTL_RECEIVE_MSG 430 #ifdef IPMICTL_RECEIVE_MSG_32 431 || cmd == IPMICTL_RECEIVE_MSG_32 432 #endif 433 )) { 434 IPMI_UNLOCK(sc); 435 return (EMSGSIZE); 436 } 437 TAILQ_REMOVE(&dev->ipmi_completed_requests, kreq, ir_link); 438 dev->ipmi_requests--; 439 IPMI_UNLOCK(sc); 440 len = min(recv->msg.data_len, len); 441 recv->msg.data_len = len; 442 error = copyout(&addr, recv->addr,sizeof(addr)); 443 if (error == 0) 444 error = copyout(&kreq->ir_compcode, recv->msg.data, 1); 445 if (error == 0) 446 error = copyout(kreq->ir_reply, recv->msg.data + 1, 447 len - 1); 448 ipmi_free_request(kreq); 449 if (error) 450 return (error); 451 break; 452 case IPMICTL_SET_MY_ADDRESS_CMD: 453 IPMI_LOCK(sc); 454 dev->ipmi_address = *(int*)data; 455 IPMI_UNLOCK(sc); 456 break; 457 case IPMICTL_GET_MY_ADDRESS_CMD: 458 IPMI_LOCK(sc); 459 *(int*)data = dev->ipmi_address; 460 IPMI_UNLOCK(sc); 461 break; 462 case IPMICTL_SET_MY_LUN_CMD: 463 IPMI_LOCK(sc); 464 dev->ipmi_lun = *(int*)data & 0x3; 465 IPMI_UNLOCK(sc); 466 break; 467 case IPMICTL_GET_MY_LUN_CMD: 468 IPMI_LOCK(sc); 469 *(int*)data = dev->ipmi_lun; 470 IPMI_UNLOCK(sc); 471 break; 472 case IPMICTL_SET_GETS_EVENTS_CMD: 473 /* 474 device_printf(sc->ipmi_dev, 475 "IPMICTL_SET_GETS_EVENTS_CMD NA\n"); 476 */ 477 break; 478 case IPMICTL_REGISTER_FOR_CMD: 479 case IPMICTL_UNREGISTER_FOR_CMD: 480 return (EOPNOTSUPP); 481 default: 482 device_printf(sc->ipmi_dev, "Unknown IOCTL %lX\n", cmd); 483 return (ENOIOCTL); 484 } 485 486 #ifdef IPMICTL_SEND_COMMAND_32 487 /* Update changed fields in 32-bit structures. */ 488 switch (cmd) { 489 case IPMICTL_RECEIVE_MSG_TRUNC_32: 490 case IPMICTL_RECEIVE_MSG_32: 491 recv32->recv_type = recv->recv_type; 492 recv32->msgid = recv->msgid; 493 recv32->msg.netfn = recv->msg.netfn; 494 recv32->msg.cmd = recv->msg.cmd; 495 recv32->msg.data_len = recv->msg.data_len; 496 break; 497 } 498 #endif 499 return (0); 500 } 501 502 /* 503 * Request management. 504 */ 505 506 __inline void 507 ipmi_init_request(struct ipmi_request *req, struct ipmi_device *dev, long msgid, 508 uint8_t addr, uint8_t command, size_t requestlen, size_t replylen) 509 { 510 511 req->ir_owner = dev; 512 req->ir_msgid = msgid; 513 req->ir_addr = addr; 514 req->ir_command = command; 515 if (requestlen) { 516 req->ir_request = (char *)&req[1]; 517 req->ir_requestlen = requestlen; 518 } 519 if (replylen) { 520 req->ir_reply = (char *)&req[1] + requestlen; 521 req->ir_replybuflen = replylen; 522 } 523 } 524 525 /* Allocate a new request with request and reply buffers. */ 526 struct ipmi_request * 527 ipmi_alloc_request(struct ipmi_device *dev, long msgid, uint8_t addr, 528 uint8_t command, size_t requestlen, size_t replylen) 529 { 530 struct ipmi_request *req; 531 532 req = malloc(sizeof(struct ipmi_request) + requestlen + replylen, 533 M_IPMI, M_WAITOK | M_ZERO); 534 ipmi_init_request(req, dev, msgid, addr, command, requestlen, replylen); 535 return (req); 536 } 537 538 /* Free a request no longer in use. */ 539 void 540 ipmi_free_request(struct ipmi_request *req) 541 { 542 543 free(req, M_IPMI); 544 } 545 546 /* Store a processed request on the appropriate completion queue. */ 547 void 548 ipmi_complete_request(struct ipmi_softc *sc, struct ipmi_request *req) 549 { 550 struct ipmi_device *dev; 551 552 IPMI_LOCK_ASSERT(sc); 553 554 /* 555 * Anonymous requests (from inside the driver) always have a 556 * waiter that we awaken. 557 */ 558 if (req->ir_owner == NULL) 559 wakeup(req); 560 else { 561 dev = req->ir_owner; 562 TAILQ_INSERT_TAIL(&dev->ipmi_completed_requests, req, ir_link); 563 selwakeup(&dev->ipmi_select); 564 if (dev->ipmi_closing) 565 wakeup(&dev->ipmi_requests); 566 } 567 } 568 569 /* Perform an internal driver request. */ 570 int 571 ipmi_submit_driver_request(struct ipmi_softc *sc, struct ipmi_request *req, 572 int timo) 573 { 574 575 return (sc->ipmi_driver_request(sc, req, timo)); 576 } 577 578 /* 579 * Helper routine for polled system interfaces that use 580 * ipmi_polled_enqueue_request() to queue requests. This request 581 * waits until there is a pending request and then returns the first 582 * request. If the driver is shutting down, it returns NULL. 583 */ 584 struct ipmi_request * 585 ipmi_dequeue_request(struct ipmi_softc *sc) 586 { 587 struct ipmi_request *req; 588 589 IPMI_LOCK_ASSERT(sc); 590 591 while (!sc->ipmi_detaching && TAILQ_EMPTY(&sc->ipmi_pending_requests) && 592 TAILQ_EMPTY(&sc->ipmi_pending_requests_highpri)) 593 cv_wait(&sc->ipmi_request_added, &sc->ipmi_requests_lock); 594 if (sc->ipmi_detaching) 595 return (NULL); 596 597 req = TAILQ_FIRST(&sc->ipmi_pending_requests_highpri); 598 if (req != NULL) 599 TAILQ_REMOVE(&sc->ipmi_pending_requests_highpri, req, ir_link); 600 else { 601 req = TAILQ_FIRST(&sc->ipmi_pending_requests); 602 TAILQ_REMOVE(&sc->ipmi_pending_requests, req, ir_link); 603 } 604 return (req); 605 } 606 607 /* Default implementation of ipmi_enqueue_request() for polled interfaces. */ 608 int 609 ipmi_polled_enqueue_request(struct ipmi_softc *sc, struct ipmi_request *req) 610 { 611 612 IPMI_LOCK_ASSERT(sc); 613 614 TAILQ_INSERT_TAIL(&sc->ipmi_pending_requests, req, ir_link); 615 cv_signal(&sc->ipmi_request_added); 616 return (0); 617 } 618 619 int 620 ipmi_polled_enqueue_request_highpri(struct ipmi_softc *sc, struct ipmi_request *req) 621 { 622 623 IPMI_LOCK_ASSERT(sc); 624 625 TAILQ_INSERT_TAIL(&sc->ipmi_pending_requests_highpri, req, ir_link); 626 cv_signal(&sc->ipmi_request_added); 627 return (0); 628 } 629 630 /* 631 * Watchdog event handler. 632 */ 633 634 static int 635 ipmi_reset_watchdog(struct ipmi_softc *sc) 636 { 637 struct ipmi_request *req; 638 int error; 639 640 IPMI_ALLOC_DRIVER_REQUEST(req, IPMI_ADDR(IPMI_APP_REQUEST, 0), 641 IPMI_RESET_WDOG, 0, 0); 642 error = ipmi_submit_driver_request(sc, req, 0); 643 if (error) { 644 device_printf(sc->ipmi_dev, "Failed to reset watchdog\n"); 645 } else if (req->ir_compcode == 0x80) { 646 error = ENOENT; 647 } else if (req->ir_compcode != 0) { 648 device_printf(sc->ipmi_dev, "Watchdog reset returned 0x%x\n", 649 req->ir_compcode); 650 error = EINVAL; 651 } 652 return (error); 653 } 654 655 static int 656 ipmi_set_watchdog(struct ipmi_softc *sc, unsigned int sec) 657 { 658 struct ipmi_request *req; 659 int error; 660 661 if (sec > 0xffff / 10) 662 return (EINVAL); 663 664 IPMI_ALLOC_DRIVER_REQUEST(req, IPMI_ADDR(IPMI_APP_REQUEST, 0), 665 IPMI_SET_WDOG, 6, 0); 666 if (sec) { 667 req->ir_request[0] = IPMI_SET_WD_TIMER_DONT_STOP 668 | IPMI_SET_WD_TIMER_SMS_OS; 669 req->ir_request[1] = (wd_timer_actions & 0xff); 670 req->ir_request[2] = min(0xff, 671 min(wd_pretimeout_countdown, (sec + 2) / 4)); 672 req->ir_request[3] = 0; /* Timer use */ 673 req->ir_request[4] = (sec * 10) & 0xff; 674 req->ir_request[5] = (sec * 10) >> 8; 675 } else { 676 req->ir_request[0] = IPMI_SET_WD_TIMER_SMS_OS; 677 req->ir_request[1] = 0; 678 req->ir_request[2] = 0; 679 req->ir_request[3] = 0; /* Timer use */ 680 req->ir_request[4] = 0; 681 req->ir_request[5] = 0; 682 } 683 error = ipmi_submit_driver_request(sc, req, 0); 684 if (error) { 685 device_printf(sc->ipmi_dev, "Failed to set watchdog\n"); 686 } else if (req->ir_compcode != 0) { 687 device_printf(sc->ipmi_dev, "Watchdog set returned 0x%x\n", 688 req->ir_compcode); 689 error = EINVAL; 690 } 691 return (error); 692 } 693 694 static void 695 ipmi_wd_event(void *arg, unsigned int cmd, int *error) 696 { 697 struct ipmi_softc *sc = arg; 698 unsigned int timeout; 699 int e; 700 701 /* Ignore requests while disabled. */ 702 if (!on) 703 return; 704 705 /* 706 * To prevent infinite hangs, we don't let anyone pat or change 707 * the watchdog when we're shutting down. (See ipmi_shutdown_event().) 708 * However, we do want to keep patting the watchdog while we are doing 709 * a coredump. 710 */ 711 if (wd_in_shutdown) { 712 if (dumping && sc->ipmi_watchdog_active) 713 ipmi_reset_watchdog(sc); 714 return; 715 } 716 717 cmd &= WD_INTERVAL; 718 if (cmd > 0 && cmd <= 63) { 719 timeout = ((uint64_t)1 << cmd) / 1000000000; 720 if (timeout == 0) 721 timeout = 1; 722 if (timeout != sc->ipmi_watchdog_active || 723 wd_timer_actions != sc->ipmi_watchdog_actions || 724 wd_pretimeout_countdown != sc->ipmi_watchdog_pretimeout) { 725 e = ipmi_set_watchdog(sc, timeout); 726 if (e == 0) { 727 sc->ipmi_watchdog_active = timeout; 728 sc->ipmi_watchdog_actions = wd_timer_actions; 729 sc->ipmi_watchdog_pretimeout = wd_pretimeout_countdown; 730 } else { 731 (void)ipmi_set_watchdog(sc, 0); 732 sc->ipmi_watchdog_active = 0; 733 sc->ipmi_watchdog_actions = 0; 734 sc->ipmi_watchdog_pretimeout = 0; 735 } 736 } 737 if (sc->ipmi_watchdog_active != 0) { 738 e = ipmi_reset_watchdog(sc); 739 if (e == 0) { 740 *error = 0; 741 } else { 742 (void)ipmi_set_watchdog(sc, 0); 743 sc->ipmi_watchdog_active = 0; 744 sc->ipmi_watchdog_actions = 0; 745 sc->ipmi_watchdog_pretimeout = 0; 746 } 747 } 748 } else if (atomic_readandclear_int(&sc->ipmi_watchdog_active) != 0) { 749 sc->ipmi_watchdog_actions = 0; 750 sc->ipmi_watchdog_pretimeout = 0; 751 752 e = ipmi_set_watchdog(sc, 0); 753 if (e != 0 && cmd == 0) 754 *error = EOPNOTSUPP; 755 } 756 } 757 758 static void 759 ipmi_shutdown_event(void *arg, unsigned int cmd, int *error) 760 { 761 struct ipmi_softc *sc = arg; 762 763 /* Ignore event if disabled. */ 764 if (!on) 765 return; 766 767 /* 768 * Positive wd_shutdown_countdown value will re-arm watchdog; 769 * Zero value in wd_shutdown_countdown will disable watchdog; 770 * Negative value in wd_shutdown_countdown will keep existing state; 771 * 772 * Revert to using a power cycle to ensure that the watchdog will 773 * do something useful here. Having the watchdog send an NMI 774 * instead is useless during shutdown, and might be ignored if an 775 * NMI already triggered. 776 */ 777 778 wd_in_shutdown = true; 779 if (wd_shutdown_countdown == 0) { 780 /* disable watchdog */ 781 ipmi_set_watchdog(sc, 0); 782 sc->ipmi_watchdog_active = 0; 783 } else if (wd_shutdown_countdown > 0) { 784 /* set desired action and time, and, reset watchdog */ 785 wd_timer_actions = IPMI_SET_WD_ACTION_POWER_CYCLE; 786 ipmi_set_watchdog(sc, wd_shutdown_countdown); 787 sc->ipmi_watchdog_active = wd_shutdown_countdown; 788 ipmi_reset_watchdog(sc); 789 } 790 } 791 792 static void 793 ipmi_power_cycle(void *arg, int howto) 794 { 795 struct ipmi_softc *sc = arg; 796 struct ipmi_request *req; 797 798 /* 799 * Ignore everything except power cycling requests 800 */ 801 if ((howto & RB_POWERCYCLE) == 0) 802 return; 803 804 device_printf(sc->ipmi_dev, "Power cycling using IPMI\n"); 805 806 /* 807 * Send a CHASSIS_CONTROL command to the CHASSIS device, subcommand 2 808 * as described in IPMI v2.0 spec section 28.3. 809 */ 810 IPMI_ALLOC_DRIVER_REQUEST(req, IPMI_ADDR(IPMI_CHASSIS_REQUEST, 0), 811 IPMI_CHASSIS_CONTROL, 1, 0); 812 req->ir_request[0] = IPMI_CC_POWER_CYCLE; 813 814 ipmi_submit_driver_request(sc, req, MAX_TIMEOUT); 815 816 if (req->ir_error != 0 || req->ir_compcode != 0) { 817 device_printf(sc->ipmi_dev, "Power cycling via IPMI failed code %#x %#x\n", 818 req->ir_error, req->ir_compcode); 819 return; 820 } 821 822 /* 823 * BMCs are notoriously slow, give it cycle_wait seconds for the power 824 * down leg of the power cycle. If that fails, fallback to the next 825 * hanlder in the shutdown_final chain and/or the platform failsafe. 826 */ 827 DELAY(cycle_wait * 1000 * 1000); 828 device_printf(sc->ipmi_dev, "Power cycling via IPMI timed out\n"); 829 } 830 831 static void 832 ipmi_startup(void *arg) 833 { 834 struct ipmi_softc *sc = arg; 835 struct ipmi_request *req; 836 device_t dev; 837 int error, i; 838 839 config_intrhook_disestablish(&sc->ipmi_ich); 840 dev = sc->ipmi_dev; 841 842 /* Initialize interface-independent state. */ 843 mtx_init(&sc->ipmi_requests_lock, "ipmi requests", NULL, MTX_DEF); 844 mtx_init(&sc->ipmi_io_lock, "ipmi io", NULL, MTX_DEF); 845 cv_init(&sc->ipmi_request_added, "ipmireq"); 846 TAILQ_INIT(&sc->ipmi_pending_requests_highpri); 847 TAILQ_INIT(&sc->ipmi_pending_requests); 848 849 /* Initialize interface-dependent state. */ 850 error = sc->ipmi_startup(sc); 851 if (error) { 852 device_printf(dev, "Failed to initialize interface: %d\n", 853 error); 854 return; 855 } 856 857 /* Send a GET_DEVICE_ID request. */ 858 IPMI_ALLOC_DRIVER_REQUEST(req, IPMI_ADDR(IPMI_APP_REQUEST, 0), 859 IPMI_GET_DEVICE_ID, 0, 15); 860 861 error = ipmi_submit_driver_request(sc, req, MAX_TIMEOUT); 862 if (error == EWOULDBLOCK) { 863 device_printf(dev, "Timed out waiting for GET_DEVICE_ID\n"); 864 return; 865 } else if (error) { 866 device_printf(dev, "Failed GET_DEVICE_ID: %d\n", error); 867 return; 868 } else if (req->ir_compcode != 0) { 869 device_printf(dev, 870 "Bad completion code for GET_DEVICE_ID: %d\n", 871 req->ir_compcode); 872 return; 873 } else if (req->ir_replylen < 5) { 874 device_printf(dev, "Short reply for GET_DEVICE_ID: %d\n", 875 req->ir_replylen); 876 return; 877 } 878 879 device_printf(dev, "IPMI device rev. %d, firmware rev. %d.%d%d, " 880 "version %d.%d, device support mask %#x\n", 881 req->ir_reply[1] & 0x0f, 882 req->ir_reply[2] & 0x7f, req->ir_reply[3] >> 4, req->ir_reply[3] & 0x0f, 883 req->ir_reply[4] & 0x0f, req->ir_reply[4] >> 4, req->ir_reply[5]); 884 885 sc->ipmi_dev_support = req->ir_reply[5]; 886 887 IPMI_INIT_DRIVER_REQUEST(req, IPMI_ADDR(IPMI_APP_REQUEST, 0), 888 IPMI_CLEAR_FLAGS, 1, 0); 889 890 ipmi_submit_driver_request(sc, req, 0); 891 892 /* XXX: Magic numbers */ 893 if (req->ir_compcode == 0xc0) { 894 device_printf(dev, "Clear flags is busy\n"); 895 } 896 if (req->ir_compcode == 0xc1) { 897 device_printf(dev, "Clear flags illegal\n"); 898 } 899 900 for (i = 0; i < 8; i++) { 901 IPMI_INIT_DRIVER_REQUEST(req, IPMI_ADDR(IPMI_APP_REQUEST, 0), 902 IPMI_GET_CHANNEL_INFO, 1, 0); 903 req->ir_request[0] = i; 904 905 error = ipmi_submit_driver_request(sc, req, 0); 906 907 if (error != 0 || req->ir_compcode != 0) 908 break; 909 } 910 device_printf(dev, "Number of channels %d\n", i); 911 912 /* 913 * Probe for watchdog, but only for backends which support 914 * polled driver requests. 915 */ 916 if (wd_init_enable && sc->ipmi_driver_requests_polled) { 917 IPMI_INIT_DRIVER_REQUEST(req, IPMI_ADDR(IPMI_APP_REQUEST, 0), 918 IPMI_GET_WDOG, 0, 0); 919 920 error = ipmi_submit_driver_request(sc, req, 0); 921 922 if (error == 0 && req->ir_compcode == 0x00) { 923 device_printf(dev, "Attached watchdog\n"); 924 /* register the watchdog event handler */ 925 sc->ipmi_watchdog_tag = EVENTHANDLER_REGISTER( 926 watchdog_list, ipmi_wd_event, sc, 0); 927 sc->ipmi_shutdown_tag = EVENTHANDLER_REGISTER( 928 shutdown_pre_sync, ipmi_shutdown_event, 929 sc, 0); 930 } 931 } 932 933 sc->ipmi_cdev = make_dev(&ipmi_cdevsw, device_get_unit(dev), 934 UID_ROOT, GID_OPERATOR, 0660, "ipmi%d", device_get_unit(dev)); 935 if (sc->ipmi_cdev == NULL) { 936 device_printf(dev, "Failed to create cdev\n"); 937 return; 938 } 939 sc->ipmi_cdev->si_drv1 = sc; 940 941 /* 942 * Set initial watchdog state. If desired, set an initial 943 * watchdog on startup. Or, if the watchdog device is 944 * disabled, clear any existing watchdog. 945 */ 946 if (on && wd_startup_countdown > 0) { 947 if (ipmi_set_watchdog(sc, wd_startup_countdown) == 0 && 948 ipmi_reset_watchdog(sc) == 0) { 949 sc->ipmi_watchdog_active = wd_startup_countdown; 950 sc->ipmi_watchdog_actions = wd_timer_actions; 951 sc->ipmi_watchdog_pretimeout = wd_pretimeout_countdown; 952 } else 953 (void)ipmi_set_watchdog(sc, 0); 954 ipmi_reset_watchdog(sc); 955 } else if (!on) 956 (void)ipmi_set_watchdog(sc, 0); 957 /* 958 * Power cycle the system off using IPMI. We use last - 2 since we don't 959 * handle all the other kinds of reboots. We'll let others handle them. 960 * We only try to do this if the BMC supports the Chassis device. 961 */ 962 if (sc->ipmi_dev_support & IPMI_ADS_CHASSIS) { 963 device_printf(dev, "Establishing power cycle handler\n"); 964 sc->ipmi_power_cycle_tag = EVENTHANDLER_REGISTER(shutdown_final, 965 ipmi_power_cycle, sc, SHUTDOWN_PRI_LAST - 2); 966 } 967 } 968 969 int 970 ipmi_attach(device_t dev) 971 { 972 struct ipmi_softc *sc = device_get_softc(dev); 973 int error; 974 975 if (sc->ipmi_irq_res != NULL && sc->ipmi_intr != NULL) { 976 error = bus_setup_intr(dev, sc->ipmi_irq_res, INTR_TYPE_MISC, 977 NULL, sc->ipmi_intr, sc, &sc->ipmi_irq); 978 if (error) { 979 device_printf(dev, "can't set up interrupt\n"); 980 return (error); 981 } 982 } 983 984 bzero(&sc->ipmi_ich, sizeof(struct intr_config_hook)); 985 sc->ipmi_ich.ich_func = ipmi_startup; 986 sc->ipmi_ich.ich_arg = sc; 987 if (config_intrhook_establish(&sc->ipmi_ich) != 0) { 988 device_printf(dev, "can't establish configuration hook\n"); 989 return (ENOMEM); 990 } 991 992 ipmi_attached = 1; 993 return (0); 994 } 995 996 int 997 ipmi_detach(device_t dev) 998 { 999 struct ipmi_softc *sc; 1000 1001 sc = device_get_softc(dev); 1002 1003 /* Fail if there are any open handles. */ 1004 IPMI_LOCK(sc); 1005 if (sc->ipmi_opened) { 1006 IPMI_UNLOCK(sc); 1007 return (EBUSY); 1008 } 1009 IPMI_UNLOCK(sc); 1010 if (sc->ipmi_cdev) 1011 destroy_dev(sc->ipmi_cdev); 1012 1013 /* Detach from watchdog handling and turn off watchdog. */ 1014 if (sc->ipmi_shutdown_tag) 1015 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, 1016 sc->ipmi_shutdown_tag); 1017 if (sc->ipmi_watchdog_tag) { 1018 EVENTHANDLER_DEREGISTER(watchdog_list, sc->ipmi_watchdog_tag); 1019 ipmi_set_watchdog(sc, 0); 1020 } 1021 1022 /* Detach from shutdown handling for power cycle reboot */ 1023 if (sc->ipmi_power_cycle_tag) 1024 EVENTHANDLER_DEREGISTER(shutdown_final, sc->ipmi_power_cycle_tag); 1025 1026 /* XXX: should use shutdown callout I think. */ 1027 /* If the backend uses a kthread, shut it down. */ 1028 IPMI_LOCK(sc); 1029 sc->ipmi_detaching = 1; 1030 if (sc->ipmi_kthread) { 1031 cv_broadcast(&sc->ipmi_request_added); 1032 msleep(sc->ipmi_kthread, &sc->ipmi_requests_lock, 0, 1033 "ipmi_wait", 0); 1034 } 1035 IPMI_UNLOCK(sc); 1036 if (sc->ipmi_irq) 1037 bus_teardown_intr(dev, sc->ipmi_irq_res, sc->ipmi_irq); 1038 1039 ipmi_release_resources(dev); 1040 mtx_destroy(&sc->ipmi_io_lock); 1041 mtx_destroy(&sc->ipmi_requests_lock); 1042 return (0); 1043 } 1044 1045 void 1046 ipmi_release_resources(device_t dev) 1047 { 1048 struct ipmi_softc *sc; 1049 int i; 1050 1051 sc = device_get_softc(dev); 1052 if (sc->ipmi_irq) 1053 bus_teardown_intr(dev, sc->ipmi_irq_res, sc->ipmi_irq); 1054 if (sc->ipmi_irq_res) 1055 bus_release_resource(dev, SYS_RES_IRQ, sc->ipmi_irq_rid, 1056 sc->ipmi_irq_res); 1057 for (i = 0; i < MAX_RES; i++) 1058 if (sc->ipmi_io_res[i]) 1059 bus_release_resource(dev, sc->ipmi_io_type, 1060 sc->ipmi_io_rid + i, sc->ipmi_io_res[i]); 1061 } 1062 1063 /* XXX: Why? */ 1064 static void 1065 ipmi_unload(void *arg) 1066 { 1067 device_t * devs; 1068 int count; 1069 int i; 1070 1071 if (devclass_get_devices(devclass_find("ipmi"), &devs, &count) != 0) 1072 return; 1073 for (i = 0; i < count; i++) 1074 device_delete_child(device_get_parent(devs[i]), devs[i]); 1075 free(devs, M_TEMP); 1076 } 1077 SYSUNINIT(ipmi_unload, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipmi_unload, NULL); 1078 1079 #ifdef IMPI_DEBUG 1080 static void 1081 dump_buf(u_char *data, int len) 1082 { 1083 char buf[20]; 1084 char line[1024]; 1085 char temp[30]; 1086 int count = 0; 1087 int i=0; 1088 1089 printf("Address %p len %d\n", data, len); 1090 if (len > 256) 1091 len = 256; 1092 line[0] = '\000'; 1093 for (; len > 0; len--, data++) { 1094 sprintf(temp, "%02x ", *data); 1095 strcat(line, temp); 1096 if (*data >= ' ' && *data <= '~') 1097 buf[count] = *data; 1098 else if (*data >= 'A' && *data <= 'Z') 1099 buf[count] = *data; 1100 else 1101 buf[count] = '.'; 1102 if (++count == 16) { 1103 buf[count] = '\000'; 1104 count = 0; 1105 printf(" %3x %s %s\n", i, line, buf); 1106 i+=16; 1107 line[0] = '\000'; 1108 } 1109 } 1110 buf[count] = '\000'; 1111 1112 for (; count != 16; count++) { 1113 strcat(line, " "); 1114 } 1115 printf(" %3x %s %s\n", i, line, buf); 1116 } 1117 #endif
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