1 /* 2 * ipmi_msghandler.c 3 * 4 * Incoming and outgoing message routing for an IPMI interface. 5 * 6 * Author: MontaVista Software, Inc. 7 * Corey Minyard <minyard@mvista.com> 8 * source@mvista.com 9 * 10 * Copyright 2002 MontaVista Software Inc. 11 * 12 * This program is free software; you can redistribute it and/or modify it 13 * under the terms of the GNU General Public License as published by the 14 * Free Software Foundation; either version 2 of the License, or (at your 15 * option) any later version. 16 * 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 24 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 26 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 27 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * You should have received a copy of the GNU General Public License along 30 * with this program; if not, write to the Free Software Foundation, Inc., 31 * 675 Mass Ave, Cambridge, MA 02139, USA. 32 */ 33 34 #include <linux/module.h> 35 #include <linux/errno.h> 36 #include <asm/system.h> 37 #include <linux/poll.h> 38 #include <linux/spinlock.h> 39 #include <linux/mutex.h> 40 #include <linux/slab.h> 41 #include <linux/ipmi.h> 42 #include <linux/ipmi_smi.h> 43 #include <linux/notifier.h> 44 #include <linux/init.h> 45 #include <linux/proc_fs.h> 46 #include <linux/rcupdate.h> 47 48 #define PFX "IPMI message handler: " 49 50 #define IPMI_DRIVER_VERSION "39.1" 51 52 static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void); 53 static int ipmi_init_msghandler(void); 54 55 static int initialized; 56 57 #ifdef CONFIG_PROC_FS 58 static struct proc_dir_entry *proc_ipmi_root; 59 #endif /* CONFIG_PROC_FS */ 60 61 /* Remain in auto-maintenance mode for this amount of time (in ms). */ 62 #define IPMI_MAINTENANCE_MODE_TIMEOUT 30000 63 64 #define MAX_EVENTS_IN_QUEUE 25 65 66 /* Don't let a message sit in a queue forever, always time it with at lest 67 the max message timer. This is in milliseconds. */ 68 #define MAX_MSG_TIMEOUT 60000 69 70 71 /* 72 * The main "user" data structure. 73 */ 74 struct ipmi_user 75 { 76 struct list_head link; 77 78 /* Set to "0" when the user is destroyed. */ 79 int valid; 80 81 struct kref refcount; 82 83 /* The upper layer that handles receive messages. */ 84 struct ipmi_user_hndl *handler; 85 void *handler_data; 86 87 /* The interface this user is bound to. */ 88 ipmi_smi_t intf; 89 90 /* Does this interface receive IPMI events? */ 91 int gets_events; 92 }; 93 94 struct cmd_rcvr 95 { 96 struct list_head link; 97 98 ipmi_user_t user; 99 unsigned char netfn; 100 unsigned char cmd; 101 unsigned int chans; 102 103 /* 104 * This is used to form a linked lised during mass deletion. 105 * Since this is in an RCU list, we cannot use the link above 106 * or change any data until the RCU period completes. So we 107 * use this next variable during mass deletion so we can have 108 * a list and don't have to wait and restart the search on 109 * every individual deletion of a command. */ 110 struct cmd_rcvr *next; 111 }; 112 113 struct seq_table 114 { 115 unsigned int inuse : 1; 116 unsigned int broadcast : 1; 117 118 unsigned long timeout; 119 unsigned long orig_timeout; 120 unsigned int retries_left; 121 122 /* To verify on an incoming send message response that this is 123 the message that the response is for, we keep a sequence id 124 and increment it every time we send a message. */ 125 long seqid; 126 127 /* This is held so we can properly respond to the message on a 128 timeout, and it is used to hold the temporary data for 129 retransmission, too. */ 130 struct ipmi_recv_msg *recv_msg; 131 }; 132 133 /* Store the information in a msgid (long) to allow us to find a 134 sequence table entry from the msgid. */ 135 #define STORE_SEQ_IN_MSGID(seq, seqid) (((seq&0xff)<<26) | (seqid&0x3ffffff)) 136 137 #define GET_SEQ_FROM_MSGID(msgid, seq, seqid) \ 138 do { \ 139 seq = ((msgid >> 26) & 0x3f); \ 140 seqid = (msgid & 0x3fffff); \ 141 } while (0) 142 143 #define NEXT_SEQID(seqid) (((seqid) + 1) & 0x3fffff) 144 145 struct ipmi_channel 146 { 147 unsigned char medium; 148 unsigned char protocol; 149 150 /* My slave address. This is initialized to IPMI_BMC_SLAVE_ADDR, 151 but may be changed by the user. */ 152 unsigned char address; 153 154 /* My LUN. This should generally stay the SMS LUN, but just in 155 case... */ 156 unsigned char lun; 157 }; 158 159 #ifdef CONFIG_PROC_FS 160 struct ipmi_proc_entry 161 { 162 char *name; 163 struct ipmi_proc_entry *next; 164 }; 165 #endif 166 167 struct bmc_device 168 { 169 struct platform_device *dev; 170 struct ipmi_device_id id; 171 unsigned char guid[16]; 172 int guid_set; 173 174 struct kref refcount; 175 176 /* bmc device attributes */ 177 struct device_attribute device_id_attr; 178 struct device_attribute provides_dev_sdrs_attr; 179 struct device_attribute revision_attr; 180 struct device_attribute firmware_rev_attr; 181 struct device_attribute version_attr; 182 struct device_attribute add_dev_support_attr; 183 struct device_attribute manufacturer_id_attr; 184 struct device_attribute product_id_attr; 185 struct device_attribute guid_attr; 186 struct device_attribute aux_firmware_rev_attr; 187 }; 188 189 #define IPMI_IPMB_NUM_SEQ 64 190 #define IPMI_MAX_CHANNELS 16 191 struct ipmi_smi 192 { 193 /* What interface number are we? */ 194 int intf_num; 195 196 struct kref refcount; 197 198 /* Used for a list of interfaces. */ 199 struct list_head link; 200 201 /* The list of upper layers that are using me. seq_lock 202 * protects this. */ 203 struct list_head users; 204 205 /* Information to supply to users. */ 206 unsigned char ipmi_version_major; 207 unsigned char ipmi_version_minor; 208 209 /* Used for wake ups at startup. */ 210 wait_queue_head_t waitq; 211 212 struct bmc_device *bmc; 213 char *my_dev_name; 214 char *sysfs_name; 215 216 /* This is the lower-layer's sender routine. Note that you 217 * must either be holding the ipmi_interfaces_mutex or be in 218 * an umpreemptible region to use this. You must fetch the 219 * value into a local variable and make sure it is not NULL. */ 220 struct ipmi_smi_handlers *handlers; 221 void *send_info; 222 223 #ifdef CONFIG_PROC_FS 224 /* A list of proc entries for this interface. This does not 225 need a lock, only one thread creates it and only one thread 226 destroys it. */ 227 spinlock_t proc_entry_lock; 228 struct ipmi_proc_entry *proc_entries; 229 #endif 230 231 /* Driver-model device for the system interface. */ 232 struct device *si_dev; 233 234 /* A table of sequence numbers for this interface. We use the 235 sequence numbers for IPMB messages that go out of the 236 interface to match them up with their responses. A routine 237 is called periodically to time the items in this list. */ 238 spinlock_t seq_lock; 239 struct seq_table seq_table[IPMI_IPMB_NUM_SEQ]; 240 int curr_seq; 241 242 /* Messages that were delayed for some reason (out of memory, 243 for instance), will go in here to be processed later in a 244 periodic timer interrupt. */ 245 spinlock_t waiting_msgs_lock; 246 struct list_head waiting_msgs; 247 248 /* The list of command receivers that are registered for commands 249 on this interface. */ 250 struct mutex cmd_rcvrs_mutex; 251 struct list_head cmd_rcvrs; 252 253 /* Events that were queues because no one was there to receive 254 them. */ 255 spinlock_t events_lock; /* For dealing with event stuff. */ 256 struct list_head waiting_events; 257 unsigned int waiting_events_count; /* How many events in queue? */ 258 int delivering_events; 259 260 /* The event receiver for my BMC, only really used at panic 261 shutdown as a place to store this. */ 262 unsigned char event_receiver; 263 unsigned char event_receiver_lun; 264 unsigned char local_sel_device; 265 unsigned char local_event_generator; 266 267 /* For handling of maintenance mode. */ 268 int maintenance_mode; 269 int maintenance_mode_enable; 270 int auto_maintenance_timeout; 271 spinlock_t maintenance_mode_lock; /* Used in a timer... */ 272 273 /* A cheap hack, if this is non-null and a message to an 274 interface comes in with a NULL user, call this routine with 275 it. Note that the message will still be freed by the 276 caller. This only works on the system interface. */ 277 void (*null_user_handler)(ipmi_smi_t intf, struct ipmi_recv_msg *msg); 278 279 /* When we are scanning the channels for an SMI, this will 280 tell which channel we are scanning. */ 281 int curr_channel; 282 283 /* Channel information */ 284 struct ipmi_channel channels[IPMI_MAX_CHANNELS]; 285 286 /* Proc FS stuff. */ 287 struct proc_dir_entry *proc_dir; 288 char proc_dir_name[10]; 289 290 spinlock_t counter_lock; /* For making counters atomic. */ 291 292 /* Commands we got that were invalid. */ 293 unsigned int sent_invalid_commands; 294 295 /* Commands we sent to the MC. */ 296 unsigned int sent_local_commands; 297 /* Responses from the MC that were delivered to a user. */ 298 unsigned int handled_local_responses; 299 /* Responses from the MC that were not delivered to a user. */ 300 unsigned int unhandled_local_responses; 301 302 /* Commands we sent out to the IPMB bus. */ 303 unsigned int sent_ipmb_commands; 304 /* Commands sent on the IPMB that had errors on the SEND CMD */ 305 unsigned int sent_ipmb_command_errs; 306 /* Each retransmit increments this count. */ 307 unsigned int retransmitted_ipmb_commands; 308 /* When a message times out (runs out of retransmits) this is 309 incremented. */ 310 unsigned int timed_out_ipmb_commands; 311 312 /* This is like above, but for broadcasts. Broadcasts are 313 *not* included in the above count (they are expected to 314 time out). */ 315 unsigned int timed_out_ipmb_broadcasts; 316 317 /* Responses I have sent to the IPMB bus. */ 318 unsigned int sent_ipmb_responses; 319 320 /* The response was delivered to the user. */ 321 unsigned int handled_ipmb_responses; 322 /* The response had invalid data in it. */ 323 unsigned int invalid_ipmb_responses; 324 /* The response didn't have anyone waiting for it. */ 325 unsigned int unhandled_ipmb_responses; 326 327 /* Commands we sent out to the IPMB bus. */ 328 unsigned int sent_lan_commands; 329 /* Commands sent on the IPMB that had errors on the SEND CMD */ 330 unsigned int sent_lan_command_errs; 331 /* Each retransmit increments this count. */ 332 unsigned int retransmitted_lan_commands; 333 /* When a message times out (runs out of retransmits) this is 334 incremented. */ 335 unsigned int timed_out_lan_commands; 336 337 /* Responses I have sent to the IPMB bus. */ 338 unsigned int sent_lan_responses; 339 340 /* The response was delivered to the user. */ 341 unsigned int handled_lan_responses; 342 /* The response had invalid data in it. */ 343 unsigned int invalid_lan_responses; 344 /* The response didn't have anyone waiting for it. */ 345 unsigned int unhandled_lan_responses; 346 347 /* The command was delivered to the user. */ 348 unsigned int handled_commands; 349 /* The command had invalid data in it. */ 350 unsigned int invalid_commands; 351 /* The command didn't have anyone waiting for it. */ 352 unsigned int unhandled_commands; 353 354 /* Invalid data in an event. */ 355 unsigned int invalid_events; 356 /* Events that were received with the proper format. */ 357 unsigned int events; 358 }; 359 #define to_si_intf_from_dev(device) container_of(device, struct ipmi_smi, dev) 360 361 /** 362 * The driver model view of the IPMI messaging driver. 363 */ 364 static struct device_driver ipmidriver = { 365 .name = "ipmi", 366 .bus = &platform_bus_type 367 }; 368 static DEFINE_MUTEX(ipmidriver_mutex); 369 370 static struct list_head ipmi_interfaces = LIST_HEAD_INIT(ipmi_interfaces); 371 static DEFINE_MUTEX(ipmi_interfaces_mutex); 372 373 /* List of watchers that want to know when smi's are added and 374 deleted. */ 375 static struct list_head smi_watchers = LIST_HEAD_INIT(smi_watchers); 376 static DEFINE_MUTEX(smi_watchers_mutex); 377 378 379 static void free_recv_msg_list(struct list_head *q) 380 { 381 struct ipmi_recv_msg *msg, *msg2; 382 383 list_for_each_entry_safe(msg, msg2, q, link) { 384 list_del(&msg->link); 385 ipmi_free_recv_msg(msg); 386 } 387 } 388 389 static void free_smi_msg_list(struct list_head *q) 390 { 391 struct ipmi_smi_msg *msg, *msg2; 392 393 list_for_each_entry_safe(msg, msg2, q, link) { 394 list_del(&msg->link); 395 ipmi_free_smi_msg(msg); 396 } 397 } 398 399 static void clean_up_interface_data(ipmi_smi_t intf) 400 { 401 int i; 402 struct cmd_rcvr *rcvr, *rcvr2; 403 struct list_head list; 404 405 free_smi_msg_list(&intf->waiting_msgs); 406 free_recv_msg_list(&intf->waiting_events); 407 408 /* 409 * Wholesale remove all the entries from the list in the 410 * interface and wait for RCU to know that none are in use. 411 */ 412 mutex_lock(&intf->cmd_rcvrs_mutex); 413 INIT_LIST_HEAD(&list); 414 list_splice_init_rcu(&intf->cmd_rcvrs, &list, synchronize_rcu); 415 mutex_unlock(&intf->cmd_rcvrs_mutex); 416 417 list_for_each_entry_safe(rcvr, rcvr2, &list, link) 418 kfree(rcvr); 419 420 for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) { 421 if ((intf->seq_table[i].inuse) 422 && (intf->seq_table[i].recv_msg)) 423 { 424 ipmi_free_recv_msg(intf->seq_table[i].recv_msg); 425 } 426 } 427 } 428 429 static void intf_free(struct kref *ref) 430 { 431 ipmi_smi_t intf = container_of(ref, struct ipmi_smi, refcount); 432 433 clean_up_interface_data(intf); 434 kfree(intf); 435 } 436 437 struct watcher_entry { 438 int intf_num; 439 ipmi_smi_t intf; 440 struct list_head link; 441 }; 442 443 int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher) 444 { 445 ipmi_smi_t intf; 446 struct list_head to_deliver = LIST_HEAD_INIT(to_deliver); 447 struct watcher_entry *e, *e2; 448 449 mutex_lock(&smi_watchers_mutex); 450 451 mutex_lock(&ipmi_interfaces_mutex); 452 453 /* Build a list of things to deliver. */ 454 list_for_each_entry(intf, &ipmi_interfaces, link) { 455 if (intf->intf_num == -1) 456 continue; 457 e = kmalloc(sizeof(*e), GFP_KERNEL); 458 if (!e) 459 goto out_err; 460 kref_get(&intf->refcount); 461 e->intf = intf; 462 e->intf_num = intf->intf_num; 463 list_add_tail(&e->link, &to_deliver); 464 } 465 466 /* We will succeed, so add it to the list. */ 467 list_add(&watcher->link, &smi_watchers); 468 469 mutex_unlock(&ipmi_interfaces_mutex); 470 471 list_for_each_entry_safe(e, e2, &to_deliver, link) { 472 list_del(&e->link); 473 watcher->new_smi(e->intf_num, e->intf->si_dev); 474 kref_put(&e->intf->refcount, intf_free); 475 kfree(e); 476 } 477 478 mutex_unlock(&smi_watchers_mutex); 479 480 return 0; 481 482 out_err: 483 mutex_unlock(&ipmi_interfaces_mutex); 484 mutex_unlock(&smi_watchers_mutex); 485 list_for_each_entry_safe(e, e2, &to_deliver, link) { 486 list_del(&e->link); 487 kref_put(&e->intf->refcount, intf_free); 488 kfree(e); 489 } 490 return -ENOMEM; 491 } 492 493 int ipmi_smi_watcher_unregister(struct ipmi_smi_watcher *watcher) 494 { 495 mutex_lock(&smi_watchers_mutex); 496 list_del(&(watcher->link)); 497 mutex_unlock(&smi_watchers_mutex); 498 return 0; 499 } 500 501 /* 502 * Must be called with smi_watchers_mutex held. 503 */ 504 static void 505 call_smi_watchers(int i, struct device *dev) 506 { 507 struct ipmi_smi_watcher *w; 508 509 list_for_each_entry(w, &smi_watchers, link) { 510 if (try_module_get(w->owner)) { 511 w->new_smi(i, dev); 512 module_put(w->owner); 513 } 514 } 515 } 516 517 static int 518 ipmi_addr_equal(struct ipmi_addr *addr1, struct ipmi_addr *addr2) 519 { 520 if (addr1->addr_type != addr2->addr_type) 521 return 0; 522 523 if (addr1->channel != addr2->channel) 524 return 0; 525 526 if (addr1->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) { 527 struct ipmi_system_interface_addr *smi_addr1 528 = (struct ipmi_system_interface_addr *) addr1; 529 struct ipmi_system_interface_addr *smi_addr2 530 = (struct ipmi_system_interface_addr *) addr2; 531 return (smi_addr1->lun == smi_addr2->lun); 532 } 533 534 if ((addr1->addr_type == IPMI_IPMB_ADDR_TYPE) 535 || (addr1->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)) 536 { 537 struct ipmi_ipmb_addr *ipmb_addr1 538 = (struct ipmi_ipmb_addr *) addr1; 539 struct ipmi_ipmb_addr *ipmb_addr2 540 = (struct ipmi_ipmb_addr *) addr2; 541 542 return ((ipmb_addr1->slave_addr == ipmb_addr2->slave_addr) 543 && (ipmb_addr1->lun == ipmb_addr2->lun)); 544 } 545 546 if (addr1->addr_type == IPMI_LAN_ADDR_TYPE) { 547 struct ipmi_lan_addr *lan_addr1 548 = (struct ipmi_lan_addr *) addr1; 549 struct ipmi_lan_addr *lan_addr2 550 = (struct ipmi_lan_addr *) addr2; 551 552 return ((lan_addr1->remote_SWID == lan_addr2->remote_SWID) 553 && (lan_addr1->local_SWID == lan_addr2->local_SWID) 554 && (lan_addr1->session_handle 555 == lan_addr2->session_handle) 556 && (lan_addr1->lun == lan_addr2->lun)); 557 } 558 559 return 1; 560 } 561 562 int ipmi_validate_addr(struct ipmi_addr *addr, int len) 563 { 564 if (len < sizeof(struct ipmi_system_interface_addr)) { 565 return -EINVAL; 566 } 567 568 if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) { 569 if (addr->channel != IPMI_BMC_CHANNEL) 570 return -EINVAL; 571 return 0; 572 } 573 574 if ((addr->channel == IPMI_BMC_CHANNEL) 575 || (addr->channel >= IPMI_MAX_CHANNELS) 576 || (addr->channel < 0)) 577 return -EINVAL; 578 579 if ((addr->addr_type == IPMI_IPMB_ADDR_TYPE) 580 || (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)) 581 { 582 if (len < sizeof(struct ipmi_ipmb_addr)) { 583 return -EINVAL; 584 } 585 return 0; 586 } 587 588 if (addr->addr_type == IPMI_LAN_ADDR_TYPE) { 589 if (len < sizeof(struct ipmi_lan_addr)) { 590 return -EINVAL; 591 } 592 return 0; 593 } 594 595 return -EINVAL; 596 } 597 598 unsigned int ipmi_addr_length(int addr_type) 599 { 600 if (addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) 601 return sizeof(struct ipmi_system_interface_addr); 602 603 if ((addr_type == IPMI_IPMB_ADDR_TYPE) 604 || (addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)) 605 { 606 return sizeof(struct ipmi_ipmb_addr); 607 } 608 609 if (addr_type == IPMI_LAN_ADDR_TYPE) 610 return sizeof(struct ipmi_lan_addr); 611 612 return 0; 613 } 614 615 static void deliver_response(struct ipmi_recv_msg *msg) 616 { 617 if (!msg->user) { 618 ipmi_smi_t intf = msg->user_msg_data; 619 unsigned long flags; 620 621 /* Special handling for NULL users. */ 622 if (intf->null_user_handler) { 623 intf->null_user_handler(intf, msg); 624 spin_lock_irqsave(&intf->counter_lock, flags); 625 intf->handled_local_responses++; 626 spin_unlock_irqrestore(&intf->counter_lock, flags); 627 } else { 628 /* No handler, so give up. */ 629 spin_lock_irqsave(&intf->counter_lock, flags); 630 intf->unhandled_local_responses++; 631 spin_unlock_irqrestore(&intf->counter_lock, flags); 632 } 633 ipmi_free_recv_msg(msg); 634 } else { 635 ipmi_user_t user = msg->user; 636 user->handler->ipmi_recv_hndl(msg, user->handler_data); 637 } 638 } 639 640 static void 641 deliver_err_response(struct ipmi_recv_msg *msg, int err) 642 { 643 msg->recv_type = IPMI_RESPONSE_RECV_TYPE; 644 msg->msg_data[0] = err; 645 msg->msg.netfn |= 1; /* Convert to a response. */ 646 msg->msg.data_len = 1; 647 msg->msg.data = msg->msg_data; 648 deliver_response(msg); 649 } 650 651 /* Find the next sequence number not being used and add the given 652 message with the given timeout to the sequence table. This must be 653 called with the interface's seq_lock held. */ 654 static int intf_next_seq(ipmi_smi_t intf, 655 struct ipmi_recv_msg *recv_msg, 656 unsigned long timeout, 657 int retries, 658 int broadcast, 659 unsigned char *seq, 660 long *seqid) 661 { 662 int rv = 0; 663 unsigned int i; 664 665 for (i = intf->curr_seq; 666 (i+1)%IPMI_IPMB_NUM_SEQ != intf->curr_seq; 667 i = (i+1)%IPMI_IPMB_NUM_SEQ) 668 { 669 if (!intf->seq_table[i].inuse) 670 break; 671 } 672 673 if (!intf->seq_table[i].inuse) { 674 intf->seq_table[i].recv_msg = recv_msg; 675 676 /* Start with the maximum timeout, when the send response 677 comes in we will start the real timer. */ 678 intf->seq_table[i].timeout = MAX_MSG_TIMEOUT; 679 intf->seq_table[i].orig_timeout = timeout; 680 intf->seq_table[i].retries_left = retries; 681 intf->seq_table[i].broadcast = broadcast; 682 intf->seq_table[i].inuse = 1; 683 intf->seq_table[i].seqid = NEXT_SEQID(intf->seq_table[i].seqid); 684 *seq = i; 685 *seqid = intf->seq_table[i].seqid; 686 intf->curr_seq = (i+1)%IPMI_IPMB_NUM_SEQ; 687 } else { 688 rv = -EAGAIN; 689 } 690 691 return rv; 692 } 693 694 /* Return the receive message for the given sequence number and 695 release the sequence number so it can be reused. Some other data 696 is passed in to be sure the message matches up correctly (to help 697 guard against message coming in after their timeout and the 698 sequence number being reused). */ 699 static int intf_find_seq(ipmi_smi_t intf, 700 unsigned char seq, 701 short channel, 702 unsigned char cmd, 703 unsigned char netfn, 704 struct ipmi_addr *addr, 705 struct ipmi_recv_msg **recv_msg) 706 { 707 int rv = -ENODEV; 708 unsigned long flags; 709 710 if (seq >= IPMI_IPMB_NUM_SEQ) 711 return -EINVAL; 712 713 spin_lock_irqsave(&(intf->seq_lock), flags); 714 if (intf->seq_table[seq].inuse) { 715 struct ipmi_recv_msg *msg = intf->seq_table[seq].recv_msg; 716 717 if ((msg->addr.channel == channel) 718 && (msg->msg.cmd == cmd) 719 && (msg->msg.netfn == netfn) 720 && (ipmi_addr_equal(addr, &(msg->addr)))) 721 { 722 *recv_msg = msg; 723 intf->seq_table[seq].inuse = 0; 724 rv = 0; 725 } 726 } 727 spin_unlock_irqrestore(&(intf->seq_lock), flags); 728 729 return rv; 730 } 731 732 733 /* Start the timer for a specific sequence table entry. */ 734 static int intf_start_seq_timer(ipmi_smi_t intf, 735 long msgid) 736 { 737 int rv = -ENODEV; 738 unsigned long flags; 739 unsigned char seq; 740 unsigned long seqid; 741 742 743 GET_SEQ_FROM_MSGID(msgid, seq, seqid); 744 745 spin_lock_irqsave(&(intf->seq_lock), flags); 746 /* We do this verification because the user can be deleted 747 while a message is outstanding. */ 748 if ((intf->seq_table[seq].inuse) 749 && (intf->seq_table[seq].seqid == seqid)) 750 { 751 struct seq_table *ent = &(intf->seq_table[seq]); 752 ent->timeout = ent->orig_timeout; 753 rv = 0; 754 } 755 spin_unlock_irqrestore(&(intf->seq_lock), flags); 756 757 return rv; 758 } 759 760 /* Got an error for the send message for a specific sequence number. */ 761 static int intf_err_seq(ipmi_smi_t intf, 762 long msgid, 763 unsigned int err) 764 { 765 int rv = -ENODEV; 766 unsigned long flags; 767 unsigned char seq; 768 unsigned long seqid; 769 struct ipmi_recv_msg *msg = NULL; 770 771 772 GET_SEQ_FROM_MSGID(msgid, seq, seqid); 773 774 spin_lock_irqsave(&(intf->seq_lock), flags); 775 /* We do this verification because the user can be deleted 776 while a message is outstanding. */ 777 if ((intf->seq_table[seq].inuse) 778 && (intf->seq_table[seq].seqid == seqid)) 779 { 780 struct seq_table *ent = &(intf->seq_table[seq]); 781 782 ent->inuse = 0; 783 msg = ent->recv_msg; 784 rv = 0; 785 } 786 spin_unlock_irqrestore(&(intf->seq_lock), flags); 787 788 if (msg) 789 deliver_err_response(msg, err); 790 791 return rv; 792 } 793 794 795 int ipmi_create_user(unsigned int if_num, 796 struct ipmi_user_hndl *handler, 797 void *handler_data, 798 ipmi_user_t *user) 799 { 800 unsigned long flags; 801 ipmi_user_t new_user; 802 int rv = 0; 803 ipmi_smi_t intf; 804 805 /* There is no module usecount here, because it's not 806 required. Since this can only be used by and called from 807 other modules, they will implicitly use this module, and 808 thus this can't be removed unless the other modules are 809 removed. */ 810 811 if (handler == NULL) 812 return -EINVAL; 813 814 /* Make sure the driver is actually initialized, this handles 815 problems with initialization order. */ 816 if (!initialized) { 817 rv = ipmi_init_msghandler(); 818 if (rv) 819 return rv; 820 821 /* The init code doesn't return an error if it was turned 822 off, but it won't initialize. Check that. */ 823 if (!initialized) 824 return -ENODEV; 825 } 826 827 new_user = kmalloc(sizeof(*new_user), GFP_KERNEL); 828 if (!new_user) 829 return -ENOMEM; 830 831 mutex_lock(&ipmi_interfaces_mutex); 832 list_for_each_entry_rcu(intf, &ipmi_interfaces, link) { 833 if (intf->intf_num == if_num) 834 goto found; 835 } 836 /* Not found, return an error */ 837 rv = -EINVAL; 838 goto out_kfree; 839 840 found: 841 /* Note that each existing user holds a refcount to the interface. */ 842 kref_get(&intf->refcount); 843 844 kref_init(&new_user->refcount); 845 new_user->handler = handler; 846 new_user->handler_data = handler_data; 847 new_user->intf = intf; 848 new_user->gets_events = 0; 849 850 if (!try_module_get(intf->handlers->owner)) { 851 rv = -ENODEV; 852 goto out_kref; 853 } 854 855 if (intf->handlers->inc_usecount) { 856 rv = intf->handlers->inc_usecount(intf->send_info); 857 if (rv) { 858 module_put(intf->handlers->owner); 859 goto out_kref; 860 } 861 } 862 863 /* Hold the lock so intf->handlers is guaranteed to be good 864 * until now */ 865 mutex_unlock(&ipmi_interfaces_mutex); 866 867 new_user->valid = 1; 868 spin_lock_irqsave(&intf->seq_lock, flags); 869 list_add_rcu(&new_user->link, &intf->users); 870 spin_unlock_irqrestore(&intf->seq_lock, flags); 871 *user = new_user; 872 return 0; 873 874 out_kref: 875 kref_put(&intf->refcount, intf_free); 876 out_kfree: 877 mutex_unlock(&ipmi_interfaces_mutex); 878 kfree(new_user); 879 return rv; 880 } 881 882 static void free_user(struct kref *ref) 883 { 884 ipmi_user_t user = container_of(ref, struct ipmi_user, refcount); 885 kfree(user); 886 } 887 888 int ipmi_destroy_user(ipmi_user_t user) 889 { 890 ipmi_smi_t intf = user->intf; 891 int i; 892 unsigned long flags; 893 struct cmd_rcvr *rcvr; 894 struct cmd_rcvr *rcvrs = NULL; 895 896 user->valid = 0; 897 898 /* Remove the user from the interface's sequence table. */ 899 spin_lock_irqsave(&intf->seq_lock, flags); 900 list_del_rcu(&user->link); 901 902 for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) { 903 if (intf->seq_table[i].inuse 904 && (intf->seq_table[i].recv_msg->user == user)) 905 { 906 intf->seq_table[i].inuse = 0; 907 ipmi_free_recv_msg(intf->seq_table[i].recv_msg); 908 } 909 } 910 spin_unlock_irqrestore(&intf->seq_lock, flags); 911 912 /* 913 * Remove the user from the command receiver's table. First 914 * we build a list of everything (not using the standard link, 915 * since other things may be using it till we do 916 * synchronize_rcu()) then free everything in that list. 917 */ 918 mutex_lock(&intf->cmd_rcvrs_mutex); 919 list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) { 920 if (rcvr->user == user) { 921 list_del_rcu(&rcvr->link); 922 rcvr->next = rcvrs; 923 rcvrs = rcvr; 924 } 925 } 926 mutex_unlock(&intf->cmd_rcvrs_mutex); 927 synchronize_rcu(); 928 while (rcvrs) { 929 rcvr = rcvrs; 930 rcvrs = rcvr->next; 931 kfree(rcvr); 932 } 933 934 mutex_lock(&ipmi_interfaces_mutex); 935 if (intf->handlers) { 936 module_put(intf->handlers->owner); 937 if (intf->handlers->dec_usecount) 938 intf->handlers->dec_usecount(intf->send_info); 939 } 940 mutex_unlock(&ipmi_interfaces_mutex); 941 942 kref_put(&intf->refcount, intf_free); 943 944 kref_put(&user->refcount, free_user); 945 946 return 0; 947 } 948 949 void ipmi_get_version(ipmi_user_t user, 950 unsigned char *major, 951 unsigned char *minor) 952 { 953 *major = user->intf->ipmi_version_major; 954 *minor = user->intf->ipmi_version_minor; 955 } 956 957 int ipmi_set_my_address(ipmi_user_t user, 958 unsigned int channel, 959 unsigned char address) 960 { 961 if (channel >= IPMI_MAX_CHANNELS) 962 return -EINVAL; 963 user->intf->channels[channel].address = address; 964 return 0; 965 } 966 967 int ipmi_get_my_address(ipmi_user_t user, 968 unsigned int channel, 969 unsigned char *address) 970 { 971 if (channel >= IPMI_MAX_CHANNELS) 972 return -EINVAL; 973 *address = user->intf->channels[channel].address; 974 return 0; 975 } 976 977 int ipmi_set_my_LUN(ipmi_user_t user, 978 unsigned int channel, 979 unsigned char LUN) 980 { 981 if (channel >= IPMI_MAX_CHANNELS) 982 return -EINVAL; 983 user->intf->channels[channel].lun = LUN & 0x3; 984 return 0; 985 } 986 987 int ipmi_get_my_LUN(ipmi_user_t user, 988 unsigned int channel, 989 unsigned char *address) 990 { 991 if (channel >= IPMI_MAX_CHANNELS) 992 return -EINVAL; 993 *address = user->intf->channels[channel].lun; 994 return 0; 995 } 996 997 int ipmi_get_maintenance_mode(ipmi_user_t user) 998 { 999 int mode; 1000 unsigned long flags; 1001 1002 spin_lock_irqsave(&user->intf->maintenance_mode_lock, flags); 1003 mode = user->intf->maintenance_mode; 1004 spin_unlock_irqrestore(&user->intf->maintenance_mode_lock, flags); 1005 1006 return mode; 1007 } 1008 EXPORT_SYMBOL(ipmi_get_maintenance_mode); 1009 1010 static void maintenance_mode_update(ipmi_smi_t intf) 1011 { 1012 if (intf->handlers->set_maintenance_mode) 1013 intf->handlers->set_maintenance_mode( 1014 intf->send_info, intf->maintenance_mode_enable); 1015 } 1016 1017 int ipmi_set_maintenance_mode(ipmi_user_t user, int mode) 1018 { 1019 int rv = 0; 1020 unsigned long flags; 1021 ipmi_smi_t intf = user->intf; 1022 1023 spin_lock_irqsave(&intf->maintenance_mode_lock, flags); 1024 if (intf->maintenance_mode != mode) { 1025 switch (mode) { 1026 case IPMI_MAINTENANCE_MODE_AUTO: 1027 intf->maintenance_mode = mode; 1028 intf->maintenance_mode_enable 1029 = (intf->auto_maintenance_timeout > 0); 1030 break; 1031 1032 case IPMI_MAINTENANCE_MODE_OFF: 1033 intf->maintenance_mode = mode; 1034 intf->maintenance_mode_enable = 0; 1035 break; 1036 1037 case IPMI_MAINTENANCE_MODE_ON: 1038 intf->maintenance_mode = mode; 1039 intf->maintenance_mode_enable = 1; 1040 break; 1041 1042 default: 1043 rv = -EINVAL; 1044 goto out_unlock; 1045 } 1046 1047 maintenance_mode_update(intf); 1048 } 1049 out_unlock: 1050 spin_unlock_irqrestore(&intf->maintenance_mode_lock, flags); 1051 1052 return rv; 1053 } 1054 EXPORT_SYMBOL(ipmi_set_maintenance_mode); 1055 1056 int ipmi_set_gets_events(ipmi_user_t user, int val) 1057 { 1058 unsigned long flags; 1059 ipmi_smi_t intf = user->intf; 1060 struct ipmi_recv_msg *msg, *msg2; 1061 struct list_head msgs; 1062 1063 INIT_LIST_HEAD(&msgs); 1064 1065 spin_lock_irqsave(&intf->events_lock, flags); 1066 user->gets_events = val; 1067 1068 if (intf->delivering_events) 1069 /* 1070 * Another thread is delivering events for this, so 1071 * let it handle any new events. 1072 */ 1073 goto out; 1074 1075 /* Deliver any queued events. */ 1076 while (user->gets_events && !list_empty(&intf->waiting_events)) { 1077 list_for_each_entry_safe(msg, msg2, &intf->waiting_events, link) 1078 list_move_tail(&msg->link, &msgs); 1079 intf->waiting_events_count = 0; 1080 1081 intf->delivering_events = 1; 1082 spin_unlock_irqrestore(&intf->events_lock, flags); 1083 1084 list_for_each_entry_safe(msg, msg2, &msgs, link) { 1085 msg->user = user; 1086 kref_get(&user->refcount); 1087 deliver_response(msg); 1088 } 1089 1090 spin_lock_irqsave(&intf->events_lock, flags); 1091 intf->delivering_events = 0; 1092 } 1093 1094 out: 1095 spin_unlock_irqrestore(&intf->events_lock, flags); 1096 1097 return 0; 1098 } 1099 1100 static struct cmd_rcvr *find_cmd_rcvr(ipmi_smi_t intf, 1101 unsigned char netfn, 1102 unsigned char cmd, 1103 unsigned char chan) 1104 { 1105 struct cmd_rcvr *rcvr; 1106 1107 list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) { 1108 if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd) 1109 && (rcvr->chans & (1 << chan))) 1110 return rcvr; 1111 } 1112 return NULL; 1113 } 1114 1115 static int is_cmd_rcvr_exclusive(ipmi_smi_t intf, 1116 unsigned char netfn, 1117 unsigned char cmd, 1118 unsigned int chans) 1119 { 1120 struct cmd_rcvr *rcvr; 1121 1122 list_for_each_entry_rcu(rcvr, &intf->cmd_rcvrs, link) { 1123 if ((rcvr->netfn == netfn) && (rcvr->cmd == cmd) 1124 && (rcvr->chans & chans)) 1125 return 0; 1126 } 1127 return 1; 1128 } 1129 1130 int ipmi_register_for_cmd(ipmi_user_t user, 1131 unsigned char netfn, 1132 unsigned char cmd, 1133 unsigned int chans) 1134 { 1135 ipmi_smi_t intf = user->intf; 1136 struct cmd_rcvr *rcvr; 1137 int rv = 0; 1138 1139 1140 rcvr = kmalloc(sizeof(*rcvr), GFP_KERNEL); 1141 if (!rcvr) 1142 return -ENOMEM; 1143 rcvr->cmd = cmd; 1144 rcvr->netfn = netfn; 1145 rcvr->chans = chans; 1146 rcvr->user = user; 1147 1148 mutex_lock(&intf->cmd_rcvrs_mutex); 1149 /* Make sure the command/netfn is not already registered. */ 1150 if (!is_cmd_rcvr_exclusive(intf, netfn, cmd, chans)) { 1151 rv = -EBUSY; 1152 goto out_unlock; 1153 } 1154 1155 list_add_rcu(&rcvr->link, &intf->cmd_rcvrs); 1156 1157 out_unlock: 1158 mutex_unlock(&intf->cmd_rcvrs_mutex); 1159 if (rv) 1160 kfree(rcvr); 1161 1162 return rv; 1163 } 1164 1165 int ipmi_unregister_for_cmd(ipmi_user_t user, 1166 unsigned char netfn, 1167 unsigned char cmd, 1168 unsigned int chans) 1169 { 1170 ipmi_smi_t intf = user->intf; 1171 struct cmd_rcvr *rcvr; 1172 struct cmd_rcvr *rcvrs = NULL; 1173 int i, rv = -ENOENT; 1174 1175 mutex_lock(&intf->cmd_rcvrs_mutex); 1176 for (i = 0; i < IPMI_NUM_CHANNELS; i++) { 1177 if (((1 << i) & chans) == 0) 1178 continue; 1179 rcvr = find_cmd_rcvr(intf, netfn, cmd, i); 1180 if (rcvr == NULL) 1181 continue; 1182 if (rcvr->user == user) { 1183 rv = 0; 1184 rcvr->chans &= ~chans; 1185 if (rcvr->chans == 0) { 1186 list_del_rcu(&rcvr->link); 1187 rcvr->next = rcvrs; 1188 rcvrs = rcvr; 1189 } 1190 } 1191 } 1192 mutex_unlock(&intf->cmd_rcvrs_mutex); 1193 synchronize_rcu(); 1194 while (rcvrs) { 1195 rcvr = rcvrs; 1196 rcvrs = rcvr->next; 1197 kfree(rcvr); 1198 } 1199 return rv; 1200 } 1201 1202 void ipmi_user_set_run_to_completion(ipmi_user_t user, int val) 1203 { 1204 ipmi_smi_t intf = user->intf; 1205 if (intf->handlers) 1206 intf->handlers->set_run_to_completion(intf->send_info, val); 1207 } 1208 1209 static unsigned char 1210 ipmb_checksum(unsigned char *data, int size) 1211 { 1212 unsigned char csum = 0; 1213 1214 for (; size > 0; size--, data++) 1215 csum += *data; 1216 1217 return -csum; 1218 } 1219 1220 static inline void format_ipmb_msg(struct ipmi_smi_msg *smi_msg, 1221 struct kernel_ipmi_msg *msg, 1222 struct ipmi_ipmb_addr *ipmb_addr, 1223 long msgid, 1224 unsigned char ipmb_seq, 1225 int broadcast, 1226 unsigned char source_address, 1227 unsigned char source_lun) 1228 { 1229 int i = broadcast; 1230 1231 /* Format the IPMB header data. */ 1232 smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); 1233 smi_msg->data[1] = IPMI_SEND_MSG_CMD; 1234 smi_msg->data[2] = ipmb_addr->channel; 1235 if (broadcast) 1236 smi_msg->data[3] = 0; 1237 smi_msg->data[i+3] = ipmb_addr->slave_addr; 1238 smi_msg->data[i+4] = (msg->netfn << 2) | (ipmb_addr->lun & 0x3); 1239 smi_msg->data[i+5] = ipmb_checksum(&(smi_msg->data[i+3]), 2); 1240 smi_msg->data[i+6] = source_address; 1241 smi_msg->data[i+7] = (ipmb_seq << 2) | source_lun; 1242 smi_msg->data[i+8] = msg->cmd; 1243 1244 /* Now tack on the data to the message. */ 1245 if (msg->data_len > 0) 1246 memcpy(&(smi_msg->data[i+9]), msg->data, 1247 msg->data_len); 1248 smi_msg->data_size = msg->data_len + 9; 1249 1250 /* Now calculate the checksum and tack it on. */ 1251 smi_msg->data[i+smi_msg->data_size] 1252 = ipmb_checksum(&(smi_msg->data[i+6]), 1253 smi_msg->data_size-6); 1254 1255 /* Add on the checksum size and the offset from the 1256 broadcast. */ 1257 smi_msg->data_size += 1 + i; 1258 1259 smi_msg->msgid = msgid; 1260 } 1261 1262 static inline void format_lan_msg(struct ipmi_smi_msg *smi_msg, 1263 struct kernel_ipmi_msg *msg, 1264 struct ipmi_lan_addr *lan_addr, 1265 long msgid, 1266 unsigned char ipmb_seq, 1267 unsigned char source_lun) 1268 { 1269 /* Format the IPMB header data. */ 1270 smi_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); 1271 smi_msg->data[1] = IPMI_SEND_MSG_CMD; 1272 smi_msg->data[2] = lan_addr->channel; 1273 smi_msg->data[3] = lan_addr->session_handle; 1274 smi_msg->data[4] = lan_addr->remote_SWID; 1275 smi_msg->data[5] = (msg->netfn << 2) | (lan_addr->lun & 0x3); 1276 smi_msg->data[6] = ipmb_checksum(&(smi_msg->data[4]), 2); 1277 smi_msg->data[7] = lan_addr->local_SWID; 1278 smi_msg->data[8] = (ipmb_seq << 2) | source_lun; 1279 smi_msg->data[9] = msg->cmd; 1280 1281 /* Now tack on the data to the message. */ 1282 if (msg->data_len > 0) 1283 memcpy(&(smi_msg->data[10]), msg->data, 1284 msg->data_len); 1285 smi_msg->data_size = msg->data_len + 10; 1286 1287 /* Now calculate the checksum and tack it on. */ 1288 smi_msg->data[smi_msg->data_size] 1289 = ipmb_checksum(&(smi_msg->data[7]), 1290 smi_msg->data_size-7); 1291 1292 /* Add on the checksum size and the offset from the 1293 broadcast. */ 1294 smi_msg->data_size += 1; 1295 1296 smi_msg->msgid = msgid; 1297 } 1298 1299 /* Separate from ipmi_request so that the user does not have to be 1300 supplied in certain circumstances (mainly at panic time). If 1301 messages are supplied, they will be freed, even if an error 1302 occurs. */ 1303 static int i_ipmi_request(ipmi_user_t user, 1304 ipmi_smi_t intf, 1305 struct ipmi_addr *addr, 1306 long msgid, 1307 struct kernel_ipmi_msg *msg, 1308 void *user_msg_data, 1309 void *supplied_smi, 1310 struct ipmi_recv_msg *supplied_recv, 1311 int priority, 1312 unsigned char source_address, 1313 unsigned char source_lun, 1314 int retries, 1315 unsigned int retry_time_ms) 1316 { 1317 int rv = 0; 1318 struct ipmi_smi_msg *smi_msg; 1319 struct ipmi_recv_msg *recv_msg; 1320 unsigned long flags; 1321 struct ipmi_smi_handlers *handlers; 1322 1323 1324 if (supplied_recv) { 1325 recv_msg = supplied_recv; 1326 } else { 1327 recv_msg = ipmi_alloc_recv_msg(); 1328 if (recv_msg == NULL) { 1329 return -ENOMEM; 1330 } 1331 } 1332 recv_msg->user_msg_data = user_msg_data; 1333 1334 if (supplied_smi) { 1335 smi_msg = (struct ipmi_smi_msg *) supplied_smi; 1336 } else { 1337 smi_msg = ipmi_alloc_smi_msg(); 1338 if (smi_msg == NULL) { 1339 ipmi_free_recv_msg(recv_msg); 1340 return -ENOMEM; 1341 } 1342 } 1343 1344 rcu_read_lock(); 1345 handlers = intf->handlers; 1346 if (!handlers) { 1347 rv = -ENODEV; 1348 goto out_err; 1349 } 1350 1351 recv_msg->user = user; 1352 if (user) 1353 kref_get(&user->refcount); 1354 recv_msg->msgid = msgid; 1355 /* Store the message to send in the receive message so timeout 1356 responses can get the proper response data. */ 1357 recv_msg->msg = *msg; 1358 1359 if (addr->addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) { 1360 struct ipmi_system_interface_addr *smi_addr; 1361 1362 if (msg->netfn & 1) { 1363 /* Responses are not allowed to the SMI. */ 1364 rv = -EINVAL; 1365 goto out_err; 1366 } 1367 1368 smi_addr = (struct ipmi_system_interface_addr *) addr; 1369 if (smi_addr->lun > 3) { 1370 spin_lock_irqsave(&intf->counter_lock, flags); 1371 intf->sent_invalid_commands++; 1372 spin_unlock_irqrestore(&intf->counter_lock, flags); 1373 rv = -EINVAL; 1374 goto out_err; 1375 } 1376 1377 memcpy(&recv_msg->addr, smi_addr, sizeof(*smi_addr)); 1378 1379 if ((msg->netfn == IPMI_NETFN_APP_REQUEST) 1380 && ((msg->cmd == IPMI_SEND_MSG_CMD) 1381 || (msg->cmd == IPMI_GET_MSG_CMD) 1382 || (msg->cmd == IPMI_READ_EVENT_MSG_BUFFER_CMD))) 1383 { 1384 /* We don't let the user do these, since we manage 1385 the sequence numbers. */ 1386 spin_lock_irqsave(&intf->counter_lock, flags); 1387 intf->sent_invalid_commands++; 1388 spin_unlock_irqrestore(&intf->counter_lock, flags); 1389 rv = -EINVAL; 1390 goto out_err; 1391 } 1392 1393 if (((msg->netfn == IPMI_NETFN_APP_REQUEST) 1394 && ((msg->cmd == IPMI_COLD_RESET_CMD) 1395 || (msg->cmd == IPMI_WARM_RESET_CMD))) 1396 || (msg->netfn == IPMI_NETFN_FIRMWARE_REQUEST)) 1397 { 1398 spin_lock_irqsave(&intf->maintenance_mode_lock, flags); 1399 intf->auto_maintenance_timeout 1400 = IPMI_MAINTENANCE_MODE_TIMEOUT; 1401 if (!intf->maintenance_mode 1402 && !intf->maintenance_mode_enable) 1403 { 1404 intf->maintenance_mode_enable = 1; 1405 maintenance_mode_update(intf); 1406 } 1407 spin_unlock_irqrestore(&intf->maintenance_mode_lock, 1408 flags); 1409 } 1410 1411 if ((msg->data_len + 2) > IPMI_MAX_MSG_LENGTH) { 1412 spin_lock_irqsave(&intf->counter_lock, flags); 1413 intf->sent_invalid_commands++; 1414 spin_unlock_irqrestore(&intf->counter_lock, flags); 1415 rv = -EMSGSIZE; 1416 goto out_err; 1417 } 1418 1419 smi_msg->data[0] = (msg->netfn << 2) | (smi_addr->lun & 0x3); 1420 smi_msg->data[1] = msg->cmd; 1421 smi_msg->msgid = msgid; 1422 smi_msg->user_data = recv_msg; 1423 if (msg->data_len > 0) 1424 memcpy(&(smi_msg->data[2]), msg->data, msg->data_len); 1425 smi_msg->data_size = msg->data_len + 2; 1426 spin_lock_irqsave(&intf->counter_lock, flags); 1427 intf->sent_local_commands++; 1428 spin_unlock_irqrestore(&intf->counter_lock, flags); 1429 } else if ((addr->addr_type == IPMI_IPMB_ADDR_TYPE) 1430 || (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE)) 1431 { 1432 struct ipmi_ipmb_addr *ipmb_addr; 1433 unsigned char ipmb_seq; 1434 long seqid; 1435 int broadcast = 0; 1436 1437 if (addr->channel >= IPMI_MAX_CHANNELS) { 1438 spin_lock_irqsave(&intf->counter_lock, flags); 1439 intf->sent_invalid_commands++; 1440 spin_unlock_irqrestore(&intf->counter_lock, flags); 1441 rv = -EINVAL; 1442 goto out_err; 1443 } 1444 1445 if (intf->channels[addr->channel].medium 1446 != IPMI_CHANNEL_MEDIUM_IPMB) 1447 { 1448 spin_lock_irqsave(&intf->counter_lock, flags); 1449 intf->sent_invalid_commands++; 1450 spin_unlock_irqrestore(&intf->counter_lock, flags); 1451 rv = -EINVAL; 1452 goto out_err; 1453 } 1454 1455 if (retries < 0) { 1456 if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE) 1457 retries = 0; /* Don't retry broadcasts. */ 1458 else 1459 retries = 4; 1460 } 1461 if (addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE) { 1462 /* Broadcasts add a zero at the beginning of the 1463 message, but otherwise is the same as an IPMB 1464 address. */ 1465 addr->addr_type = IPMI_IPMB_ADDR_TYPE; 1466 broadcast = 1; 1467 } 1468 1469 1470 /* Default to 1 second retries. */ 1471 if (retry_time_ms == 0) 1472 retry_time_ms = 1000; 1473 1474 /* 9 for the header and 1 for the checksum, plus 1475 possibly one for the broadcast. */ 1476 if ((msg->data_len + 10 + broadcast) > IPMI_MAX_MSG_LENGTH) { 1477 spin_lock_irqsave(&intf->counter_lock, flags); 1478 intf->sent_invalid_commands++; 1479 spin_unlock_irqrestore(&intf->counter_lock, flags); 1480 rv = -EMSGSIZE; 1481 goto out_err; 1482 } 1483 1484 ipmb_addr = (struct ipmi_ipmb_addr *) addr; 1485 if (ipmb_addr->lun > 3) { 1486 spin_lock_irqsave(&intf->counter_lock, flags); 1487 intf->sent_invalid_commands++; 1488 spin_unlock_irqrestore(&intf->counter_lock, flags); 1489 rv = -EINVAL; 1490 goto out_err; 1491 } 1492 1493 memcpy(&recv_msg->addr, ipmb_addr, sizeof(*ipmb_addr)); 1494 1495 if (recv_msg->msg.netfn & 0x1) { 1496 /* It's a response, so use the user's sequence 1497 from msgid. */ 1498 spin_lock_irqsave(&intf->counter_lock, flags); 1499 intf->sent_ipmb_responses++; 1500 spin_unlock_irqrestore(&intf->counter_lock, flags); 1501 format_ipmb_msg(smi_msg, msg, ipmb_addr, msgid, 1502 msgid, broadcast, 1503 source_address, source_lun); 1504 1505 /* Save the receive message so we can use it 1506 to deliver the response. */ 1507 smi_msg->user_data = recv_msg; 1508 } else { 1509 /* It's a command, so get a sequence for it. */ 1510 1511 spin_lock_irqsave(&(intf->seq_lock), flags); 1512 1513 spin_lock(&intf->counter_lock); 1514 intf->sent_ipmb_commands++; 1515 spin_unlock(&intf->counter_lock); 1516 1517 /* Create a sequence number with a 1 second 1518 timeout and 4 retries. */ 1519 rv = intf_next_seq(intf, 1520 recv_msg, 1521 retry_time_ms, 1522 retries, 1523 broadcast, 1524 &ipmb_seq, 1525 &seqid); 1526 if (rv) { 1527 /* We have used up all the sequence numbers, 1528 probably, so abort. */ 1529 spin_unlock_irqrestore(&(intf->seq_lock), 1530 flags); 1531 goto out_err; 1532 } 1533 1534 /* Store the sequence number in the message, 1535 so that when the send message response 1536 comes back we can start the timer. */ 1537 format_ipmb_msg(smi_msg, msg, ipmb_addr, 1538 STORE_SEQ_IN_MSGID(ipmb_seq, seqid), 1539 ipmb_seq, broadcast, 1540 source_address, source_lun); 1541 1542 /* Copy the message into the recv message data, so we 1543 can retransmit it later if necessary. */ 1544 memcpy(recv_msg->msg_data, smi_msg->data, 1545 smi_msg->data_size); 1546 recv_msg->msg.data = recv_msg->msg_data; 1547 recv_msg->msg.data_len = smi_msg->data_size; 1548 1549 /* We don't unlock until here, because we need 1550 to copy the completed message into the 1551 recv_msg before we release the lock. 1552 Otherwise, race conditions may bite us. I 1553 know that's pretty paranoid, but I prefer 1554 to be correct. */ 1555 spin_unlock_irqrestore(&(intf->seq_lock), flags); 1556 } 1557 } else if (addr->addr_type == IPMI_LAN_ADDR_TYPE) { 1558 struct ipmi_lan_addr *lan_addr; 1559 unsigned char ipmb_seq; 1560 long seqid; 1561 1562 if (addr->channel >= IPMI_MAX_CHANNELS) { 1563 spin_lock_irqsave(&intf->counter_lock, flags); 1564 intf->sent_invalid_commands++; 1565 spin_unlock_irqrestore(&intf->counter_lock, flags); 1566 rv = -EINVAL; 1567 goto out_err; 1568 } 1569 1570 if ((intf->channels[addr->channel].medium 1571 != IPMI_CHANNEL_MEDIUM_8023LAN) 1572 && (intf->channels[addr->channel].medium 1573 != IPMI_CHANNEL_MEDIUM_ASYNC)) 1574 { 1575 spin_lock_irqsave(&intf->counter_lock, flags); 1576 intf->sent_invalid_commands++; 1577 spin_unlock_irqrestore(&intf->counter_lock, flags); 1578 rv = -EINVAL; 1579 goto out_err; 1580 } 1581 1582 retries = 4; 1583 1584 /* Default to 1 second retries. */ 1585 if (retry_time_ms == 0) 1586 retry_time_ms = 1000; 1587 1588 /* 11 for the header and 1 for the checksum. */ 1589 if ((msg->data_len + 12) > IPMI_MAX_MSG_LENGTH) { 1590 spin_lock_irqsave(&intf->counter_lock, flags); 1591 intf->sent_invalid_commands++; 1592 spin_unlock_irqrestore(&intf->counter_lock, flags); 1593 rv = -EMSGSIZE; 1594 goto out_err; 1595 } 1596 1597 lan_addr = (struct ipmi_lan_addr *) addr; 1598 if (lan_addr->lun > 3) { 1599 spin_lock_irqsave(&intf->counter_lock, flags); 1600 intf->sent_invalid_commands++; 1601 spin_unlock_irqrestore(&intf->counter_lock, flags); 1602 rv = -EINVAL; 1603 goto out_err; 1604 } 1605 1606 memcpy(&recv_msg->addr, lan_addr, sizeof(*lan_addr)); 1607 1608 if (recv_msg->msg.netfn & 0x1) { 1609 /* It's a response, so use the user's sequence 1610 from msgid. */ 1611 spin_lock_irqsave(&intf->counter_lock, flags); 1612 intf->sent_lan_responses++; 1613 spin_unlock_irqrestore(&intf->counter_lock, flags); 1614 format_lan_msg(smi_msg, msg, lan_addr, msgid, 1615 msgid, source_lun); 1616 1617 /* Save the receive message so we can use it 1618 to deliver the response. */ 1619 smi_msg->user_data = recv_msg; 1620 } else { 1621 /* It's a command, so get a sequence for it. */ 1622 1623 spin_lock_irqsave(&(intf->seq_lock), flags); 1624 1625 spin_lock(&intf->counter_lock); 1626 intf->sent_lan_commands++; 1627 spin_unlock(&intf->counter_lock); 1628 1629 /* Create a sequence number with a 1 second 1630 timeout and 4 retries. */ 1631 rv = intf_next_seq(intf, 1632 recv_msg, 1633 retry_time_ms, 1634 retries, 1635 0, 1636 &ipmb_seq, 1637 &seqid); 1638 if (rv) { 1639 /* We have used up all the sequence numbers, 1640 probably, so abort. */ 1641 spin_unlock_irqrestore(&(intf->seq_lock), 1642 flags); 1643 goto out_err; 1644 } 1645 1646 /* Store the sequence number in the message, 1647 so that when the send message response 1648 comes back we can start the timer. */ 1649 format_lan_msg(smi_msg, msg, lan_addr, 1650 STORE_SEQ_IN_MSGID(ipmb_seq, seqid), 1651 ipmb_seq, source_lun); 1652 1653 /* Copy the message into the recv message data, so we 1654 can retransmit it later if necessary. */ 1655 memcpy(recv_msg->msg_data, smi_msg->data, 1656 smi_msg->data_size); 1657 recv_msg->msg.data = recv_msg->msg_data; 1658 recv_msg->msg.data_len = smi_msg->data_size; 1659 1660 /* We don't unlock until here, because we need 1661 to copy the completed message into the 1662 recv_msg before we release the lock. 1663 Otherwise, race conditions may bite us. I 1664 know that's pretty paranoid, but I prefer 1665 to be correct. */ 1666 spin_unlock_irqrestore(&(intf->seq_lock), flags); 1667 } 1668 } else { 1669 /* Unknown address type. */ 1670 spin_lock_irqsave(&intf->counter_lock, flags); 1671 intf->sent_invalid_commands++; 1672 spin_unlock_irqrestore(&intf->counter_lock, flags); 1673 rv = -EINVAL; 1674 goto out_err; 1675 } 1676 1677 #ifdef DEBUG_MSGING 1678 { 1679 int m; 1680 for (m = 0; m < smi_msg->data_size; m++) 1681 printk(" %2.2x", smi_msg->data[m]); 1682 printk("\n"); 1683 } 1684 #endif 1685 1686 handlers->sender(intf->send_info, smi_msg, priority); 1687 rcu_read_unlock(); 1688 1689 return 0; 1690 1691 out_err: 1692 rcu_read_unlock(); 1693 ipmi_free_smi_msg(smi_msg); 1694 ipmi_free_recv_msg(recv_msg); 1695 return rv; 1696 } 1697 1698 static int check_addr(ipmi_smi_t intf, 1699 struct ipmi_addr *addr, 1700 unsigned char *saddr, 1701 unsigned char *lun) 1702 { 1703 if (addr->channel >= IPMI_MAX_CHANNELS) 1704 return -EINVAL; 1705 *lun = intf->channels[addr->channel].lun; 1706 *saddr = intf->channels[addr->channel].address; 1707 return 0; 1708 } 1709 1710 int ipmi_request_settime(ipmi_user_t user, 1711 struct ipmi_addr *addr, 1712 long msgid, 1713 struct kernel_ipmi_msg *msg, 1714 void *user_msg_data, 1715 int priority, 1716 int retries, 1717 unsigned int retry_time_ms) 1718 { 1719 unsigned char saddr, lun; 1720 int rv; 1721 1722 if (!user) 1723 return -EINVAL; 1724 rv = check_addr(user->intf, addr, &saddr, &lun); 1725 if (rv) 1726 return rv; 1727 return i_ipmi_request(user, 1728 user->intf, 1729 addr, 1730 msgid, 1731 msg, 1732 user_msg_data, 1733 NULL, NULL, 1734 priority, 1735 saddr, 1736 lun, 1737 retries, 1738 retry_time_ms); 1739 } 1740 1741 int ipmi_request_supply_msgs(ipmi_user_t user, 1742 struct ipmi_addr *addr, 1743 long msgid, 1744 struct kernel_ipmi_msg *msg, 1745 void *user_msg_data, 1746 void *supplied_smi, 1747 struct ipmi_recv_msg *supplied_recv, 1748 int priority) 1749 { 1750 unsigned char saddr, lun; 1751 int rv; 1752 1753 if (!user) 1754 return -EINVAL; 1755 rv = check_addr(user->intf, addr, &saddr, &lun); 1756 if (rv) 1757 return rv; 1758 return i_ipmi_request(user, 1759 user->intf, 1760 addr, 1761 msgid, 1762 msg, 1763 user_msg_data, 1764 supplied_smi, 1765 supplied_recv, 1766 priority, 1767 saddr, 1768 lun, 1769 -1, 0); 1770 } 1771 1772 #ifdef CONFIG_PROC_FS 1773 static int ipmb_file_read_proc(char *page, char **start, off_t off, 1774 int count, int *eof, void *data) 1775 { 1776 char *out = (char *) page; 1777 ipmi_smi_t intf = data; 1778 int i; 1779 int rv = 0; 1780 1781 for (i = 0; i < IPMI_MAX_CHANNELS; i++) 1782 rv += sprintf(out+rv, "%x ", intf->channels[i].address); 1783 out[rv-1] = '\n'; /* Replace the final space with a newline */ 1784 out[rv] = '\0'; 1785 rv++; 1786 return rv; 1787 } 1788 1789 static int version_file_read_proc(char *page, char **start, off_t off, 1790 int count, int *eof, void *data) 1791 { 1792 char *out = (char *) page; 1793 ipmi_smi_t intf = data; 1794 1795 return sprintf(out, "%d.%d\n", 1796 ipmi_version_major(&intf->bmc->id), 1797 ipmi_version_minor(&intf->bmc->id)); 1798 } 1799 1800 static int stat_file_read_proc(char *page, char **start, off_t off, 1801 int count, int *eof, void *data) 1802 { 1803 char *out = (char *) page; 1804 ipmi_smi_t intf = data; 1805 1806 out += sprintf(out, "sent_invalid_commands: %d\n", 1807 intf->sent_invalid_commands); 1808 out += sprintf(out, "sent_local_commands: %d\n", 1809 intf->sent_local_commands); 1810 out += sprintf(out, "handled_local_responses: %d\n", 1811 intf->handled_local_responses); 1812 out += sprintf(out, "unhandled_local_responses: %d\n", 1813 intf->unhandled_local_responses); 1814 out += sprintf(out, "sent_ipmb_commands: %d\n", 1815 intf->sent_ipmb_commands); 1816 out += sprintf(out, "sent_ipmb_command_errs: %d\n", 1817 intf->sent_ipmb_command_errs); 1818 out += sprintf(out, "retransmitted_ipmb_commands: %d\n", 1819 intf->retransmitted_ipmb_commands); 1820 out += sprintf(out, "timed_out_ipmb_commands: %d\n", 1821 intf->timed_out_ipmb_commands); 1822 out += sprintf(out, "timed_out_ipmb_broadcasts: %d\n", 1823 intf->timed_out_ipmb_broadcasts); 1824 out += sprintf(out, "sent_ipmb_responses: %d\n", 1825 intf->sent_ipmb_responses); 1826 out += sprintf(out, "handled_ipmb_responses: %d\n", 1827 intf->handled_ipmb_responses); 1828 out += sprintf(out, "invalid_ipmb_responses: %d\n", 1829 intf->invalid_ipmb_responses); 1830 out += sprintf(out, "unhandled_ipmb_responses: %d\n", 1831 intf->unhandled_ipmb_responses); 1832 out += sprintf(out, "sent_lan_commands: %d\n", 1833 intf->sent_lan_commands); 1834 out += sprintf(out, "sent_lan_command_errs: %d\n", 1835 intf->sent_lan_command_errs); 1836 out += sprintf(out, "retransmitted_lan_commands: %d\n", 1837 intf->retransmitted_lan_commands); 1838 out += sprintf(out, "timed_out_lan_commands: %d\n", 1839 intf->timed_out_lan_commands); 1840 out += sprintf(out, "sent_lan_responses: %d\n", 1841 intf->sent_lan_responses); 1842 out += sprintf(out, "handled_lan_responses: %d\n", 1843 intf->handled_lan_responses); 1844 out += sprintf(out, "invalid_lan_responses: %d\n", 1845 intf->invalid_lan_responses); 1846 out += sprintf(out, "unhandled_lan_responses: %d\n", 1847 intf->unhandled_lan_responses); 1848 out += sprintf(out, "handled_commands: %d\n", 1849 intf->handled_commands); 1850 out += sprintf(out, "invalid_commands: %d\n", 1851 intf->invalid_commands); 1852 out += sprintf(out, "unhandled_commands: %d\n", 1853 intf->unhandled_commands); 1854 out += sprintf(out, "invalid_events: %d\n", 1855 intf->invalid_events); 1856 out += sprintf(out, "events: %d\n", 1857 intf->events); 1858 1859 return (out - ((char *) page)); 1860 } 1861 #endif /* CONFIG_PROC_FS */ 1862 1863 int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name, 1864 read_proc_t *read_proc, write_proc_t *write_proc, 1865 void *data, struct module *owner) 1866 { 1867 int rv = 0; 1868 #ifdef CONFIG_PROC_FS 1869 struct proc_dir_entry *file; 1870 struct ipmi_proc_entry *entry; 1871 1872 /* Create a list element. */ 1873 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 1874 if (!entry) 1875 return -ENOMEM; 1876 entry->name = kmalloc(strlen(name)+1, GFP_KERNEL); 1877 if (!entry->name) { 1878 kfree(entry); 1879 return -ENOMEM; 1880 } 1881 strcpy(entry->name, name); 1882 1883 file = create_proc_entry(name, 0, smi->proc_dir); 1884 if (!file) { 1885 kfree(entry->name); 1886 kfree(entry); 1887 rv = -ENOMEM; 1888 } else { 1889 file->data = data; 1890 file->read_proc = read_proc; 1891 file->write_proc = write_proc; 1892 file->owner = owner; 1893 1894 spin_lock(&smi->proc_entry_lock); 1895 /* Stick it on the list. */ 1896 entry->next = smi->proc_entries; 1897 smi->proc_entries = entry; 1898 spin_unlock(&smi->proc_entry_lock); 1899 } 1900 #endif /* CONFIG_PROC_FS */ 1901 1902 return rv; 1903 } 1904 1905 static int add_proc_entries(ipmi_smi_t smi, int num) 1906 { 1907 int rv = 0; 1908 1909 #ifdef CONFIG_PROC_FS 1910 sprintf(smi->proc_dir_name, "%d", num); 1911 smi->proc_dir = proc_mkdir(smi->proc_dir_name, proc_ipmi_root); 1912 if (!smi->proc_dir) 1913 rv = -ENOMEM; 1914 else { 1915 smi->proc_dir->owner = THIS_MODULE; 1916 } 1917 1918 if (rv == 0) 1919 rv = ipmi_smi_add_proc_entry(smi, "stats", 1920 stat_file_read_proc, NULL, 1921 smi, THIS_MODULE); 1922 1923 if (rv == 0) 1924 rv = ipmi_smi_add_proc_entry(smi, "ipmb", 1925 ipmb_file_read_proc, NULL, 1926 smi, THIS_MODULE); 1927 1928 if (rv == 0) 1929 rv = ipmi_smi_add_proc_entry(smi, "version", 1930 version_file_read_proc, NULL, 1931 smi, THIS_MODULE); 1932 #endif /* CONFIG_PROC_FS */ 1933 1934 return rv; 1935 } 1936 1937 static void remove_proc_entries(ipmi_smi_t smi) 1938 { 1939 #ifdef CONFIG_PROC_FS 1940 struct ipmi_proc_entry *entry; 1941 1942 spin_lock(&smi->proc_entry_lock); 1943 while (smi->proc_entries) { 1944 entry = smi->proc_entries; 1945 smi->proc_entries = entry->next; 1946 1947 remove_proc_entry(entry->name, smi->proc_dir); 1948 kfree(entry->name); 1949 kfree(entry); 1950 } 1951 spin_unlock(&smi->proc_entry_lock); 1952 remove_proc_entry(smi->proc_dir_name, proc_ipmi_root); 1953 #endif /* CONFIG_PROC_FS */ 1954 } 1955 1956 static int __find_bmc_guid(struct device *dev, void *data) 1957 { 1958 unsigned char *id = data; 1959 struct bmc_device *bmc = dev_get_drvdata(dev); 1960 return memcmp(bmc->guid, id, 16) == 0; 1961 } 1962 1963 static struct bmc_device *ipmi_find_bmc_guid(struct device_driver *drv, 1964 unsigned char *guid) 1965 { 1966 struct device *dev; 1967 1968 dev = driver_find_device(drv, NULL, guid, __find_bmc_guid); 1969 if (dev) 1970 return dev_get_drvdata(dev); 1971 else 1972 return NULL; 1973 } 1974 1975 struct prod_dev_id { 1976 unsigned int product_id; 1977 unsigned char device_id; 1978 }; 1979 1980 static int __find_bmc_prod_dev_id(struct device *dev, void *data) 1981 { 1982 struct prod_dev_id *id = data; 1983 struct bmc_device *bmc = dev_get_drvdata(dev); 1984 1985 return (bmc->id.product_id == id->product_id 1986 && bmc->id.device_id == id->device_id); 1987 } 1988 1989 static struct bmc_device *ipmi_find_bmc_prod_dev_id( 1990 struct device_driver *drv, 1991 unsigned int product_id, unsigned char device_id) 1992 { 1993 struct prod_dev_id id = { 1994 .product_id = product_id, 1995 .device_id = device_id, 1996 }; 1997 struct device *dev; 1998 1999 dev = driver_find_device(drv, NULL, &id, __find_bmc_prod_dev_id); 2000 if (dev) 2001 return dev_get_drvdata(dev); 2002 else 2003 return NULL; 2004 } 2005 2006 static ssize_t device_id_show(struct device *dev, 2007 struct device_attribute *attr, 2008 char *buf) 2009 { 2010 struct bmc_device *bmc = dev_get_drvdata(dev); 2011 2012 return snprintf(buf, 10, "%u\n", bmc->id.device_id); 2013 } 2014 2015 static ssize_t provides_dev_sdrs_show(struct device *dev, 2016 struct device_attribute *attr, 2017 char *buf) 2018 { 2019 struct bmc_device *bmc = dev_get_drvdata(dev); 2020 2021 return snprintf(buf, 10, "%u\n", 2022 (bmc->id.device_revision & 0x80) >> 7); 2023 } 2024 2025 static ssize_t revision_show(struct device *dev, struct device_attribute *attr, 2026 char *buf) 2027 { 2028 struct bmc_device *bmc = dev_get_drvdata(dev); 2029 2030 return snprintf(buf, 20, "%u\n", 2031 bmc->id.device_revision & 0x0F); 2032 } 2033 2034 static ssize_t firmware_rev_show(struct device *dev, 2035 struct device_attribute *attr, 2036 char *buf) 2037 { 2038 struct bmc_device *bmc = dev_get_drvdata(dev); 2039 2040 return snprintf(buf, 20, "%u.%x\n", bmc->id.firmware_revision_1, 2041 bmc->id.firmware_revision_2); 2042 } 2043 2044 static ssize_t ipmi_version_show(struct device *dev, 2045 struct device_attribute *attr, 2046 char *buf) 2047 { 2048 struct bmc_device *bmc = dev_get_drvdata(dev); 2049 2050 return snprintf(buf, 20, "%u.%u\n", 2051 ipmi_version_major(&bmc->id), 2052 ipmi_version_minor(&bmc->id)); 2053 } 2054 2055 static ssize_t add_dev_support_show(struct device *dev, 2056 struct device_attribute *attr, 2057 char *buf) 2058 { 2059 struct bmc_device *bmc = dev_get_drvdata(dev); 2060 2061 return snprintf(buf, 10, "0x%02x\n", 2062 bmc->id.additional_device_support); 2063 } 2064 2065 static ssize_t manufacturer_id_show(struct device *dev, 2066 struct device_attribute *attr, 2067 char *buf) 2068 { 2069 struct bmc_device *bmc = dev_get_drvdata(dev); 2070 2071 return snprintf(buf, 20, "0x%6.6x\n", bmc->id.manufacturer_id); 2072 } 2073 2074 static ssize_t product_id_show(struct device *dev, 2075 struct device_attribute *attr, 2076 char *buf) 2077 { 2078 struct bmc_device *bmc = dev_get_drvdata(dev); 2079 2080 return snprintf(buf, 10, "0x%4.4x\n", bmc->id.product_id); 2081 } 2082 2083 static ssize_t aux_firmware_rev_show(struct device *dev, 2084 struct device_attribute *attr, 2085 char *buf) 2086 { 2087 struct bmc_device *bmc = dev_get_drvdata(dev); 2088 2089 return snprintf(buf, 21, "0x%02x 0x%02x 0x%02x 0x%02x\n", 2090 bmc->id.aux_firmware_revision[3], 2091 bmc->id.aux_firmware_revision[2], 2092 bmc->id.aux_firmware_revision[1], 2093 bmc->id.aux_firmware_revision[0]); 2094 } 2095 2096 static ssize_t guid_show(struct device *dev, struct device_attribute *attr, 2097 char *buf) 2098 { 2099 struct bmc_device *bmc = dev_get_drvdata(dev); 2100 2101 return snprintf(buf, 100, "%Lx%Lx\n", 2102 (long long) bmc->guid[0], 2103 (long long) bmc->guid[8]); 2104 } 2105 2106 static void remove_files(struct bmc_device *bmc) 2107 { 2108 if (!bmc->dev) 2109 return; 2110 2111 device_remove_file(&bmc->dev->dev, 2112 &bmc->device_id_attr); 2113 device_remove_file(&bmc->dev->dev, 2114 &bmc->provides_dev_sdrs_attr); 2115 device_remove_file(&bmc->dev->dev, 2116 &bmc->revision_attr); 2117 device_remove_file(&bmc->dev->dev, 2118 &bmc->firmware_rev_attr); 2119 device_remove_file(&bmc->dev->dev, 2120 &bmc->version_attr); 2121 device_remove_file(&bmc->dev->dev, 2122 &bmc->add_dev_support_attr); 2123 device_remove_file(&bmc->dev->dev, 2124 &bmc->manufacturer_id_attr); 2125 device_remove_file(&bmc->dev->dev, 2126 &bmc->product_id_attr); 2127 2128 if (bmc->id.aux_firmware_revision_set) 2129 device_remove_file(&bmc->dev->dev, 2130 &bmc->aux_firmware_rev_attr); 2131 if (bmc->guid_set) 2132 device_remove_file(&bmc->dev->dev, 2133 &bmc->guid_attr); 2134 } 2135 2136 static void 2137 cleanup_bmc_device(struct kref *ref) 2138 { 2139 struct bmc_device *bmc; 2140 2141 bmc = container_of(ref, struct bmc_device, refcount); 2142 2143 remove_files(bmc); 2144 platform_device_unregister(bmc->dev); 2145 kfree(bmc); 2146 } 2147 2148 static void ipmi_bmc_unregister(ipmi_smi_t intf) 2149 { 2150 struct bmc_device *bmc = intf->bmc; 2151 2152 if (intf->sysfs_name) { 2153 sysfs_remove_link(&intf->si_dev->kobj, intf->sysfs_name); 2154 kfree(intf->sysfs_name); 2155 intf->sysfs_name = NULL; 2156 } 2157 if (intf->my_dev_name) { 2158 sysfs_remove_link(&bmc->dev->dev.kobj, intf->my_dev_name); 2159 kfree(intf->my_dev_name); 2160 intf->my_dev_name = NULL; 2161 } 2162 2163 mutex_lock(&ipmidriver_mutex); 2164 kref_put(&bmc->refcount, cleanup_bmc_device); 2165 intf->bmc = NULL; 2166 mutex_unlock(&ipmidriver_mutex); 2167 } 2168 2169 static int create_files(struct bmc_device *bmc) 2170 { 2171 int err; 2172 2173 bmc->device_id_attr.attr.name = "device_id"; 2174 bmc->device_id_attr.attr.owner = THIS_MODULE; 2175 bmc->device_id_attr.attr.mode = S_IRUGO; 2176 bmc->device_id_attr.show = device_id_show; 2177 2178 bmc->provides_dev_sdrs_attr.attr.name = "provides_device_sdrs"; 2179 bmc->provides_dev_sdrs_attr.attr.owner = THIS_MODULE; 2180 bmc->provides_dev_sdrs_attr.attr.mode = S_IRUGO; 2181 bmc->provides_dev_sdrs_attr.show = provides_dev_sdrs_show; 2182 2183 bmc->revision_attr.attr.name = "revision"; 2184 bmc->revision_attr.attr.owner = THIS_MODULE; 2185 bmc->revision_attr.attr.mode = S_IRUGO; 2186 bmc->revision_attr.show = revision_show; 2187 2188 bmc->firmware_rev_attr.attr.name = "firmware_revision"; 2189 bmc->firmware_rev_attr.attr.owner = THIS_MODULE; 2190 bmc->firmware_rev_attr.attr.mode = S_IRUGO; 2191 bmc->firmware_rev_attr.show = firmware_rev_show; 2192 2193 bmc->version_attr.attr.name = "ipmi_version"; 2194 bmc->version_attr.attr.owner = THIS_MODULE; 2195 bmc->version_attr.attr.mode = S_IRUGO; 2196 bmc->version_attr.show = ipmi_version_show; 2197 2198 bmc->add_dev_support_attr.attr.name = "additional_device_support"; 2199 bmc->add_dev_support_attr.attr.owner = THIS_MODULE; 2200 bmc->add_dev_support_attr.attr.mode = S_IRUGO; 2201 bmc->add_dev_support_attr.show = add_dev_support_show; 2202 2203 bmc->manufacturer_id_attr.attr.name = "manufacturer_id"; 2204 bmc->manufacturer_id_attr.attr.owner = THIS_MODULE; 2205 bmc->manufacturer_id_attr.attr.mode = S_IRUGO; 2206 bmc->manufacturer_id_attr.show = manufacturer_id_show; 2207 2208 bmc->product_id_attr.attr.name = "product_id"; 2209 bmc->product_id_attr.attr.owner = THIS_MODULE; 2210 bmc->product_id_attr.attr.mode = S_IRUGO; 2211 bmc->product_id_attr.show = product_id_show; 2212 2213 bmc->guid_attr.attr.name = "guid"; 2214 bmc->guid_attr.attr.owner = THIS_MODULE; 2215 bmc->guid_attr.attr.mode = S_IRUGO; 2216 bmc->guid_attr.show = guid_show; 2217 2218 bmc->aux_firmware_rev_attr.attr.name = "aux_firmware_revision"; 2219 bmc->aux_firmware_rev_attr.attr.owner = THIS_MODULE; 2220 bmc->aux_firmware_rev_attr.attr.mode = S_IRUGO; 2221 bmc->aux_firmware_rev_attr.show = aux_firmware_rev_show; 2222 2223 err = device_create_file(&bmc->dev->dev, 2224 &bmc->device_id_attr); 2225 if (err) goto out; 2226 err = device_create_file(&bmc->dev->dev, 2227 &bmc->provides_dev_sdrs_attr); 2228 if (err) goto out_devid; 2229 err = device_create_file(&bmc->dev->dev, 2230 &bmc->revision_attr); 2231 if (err) goto out_sdrs; 2232 err = device_create_file(&bmc->dev->dev, 2233 &bmc->firmware_rev_attr); 2234 if (err) goto out_rev; 2235 err = device_create_file(&bmc->dev->dev, 2236 &bmc->version_attr); 2237 if (err) goto out_firm; 2238 err = device_create_file(&bmc->dev->dev, 2239 &bmc->add_dev_support_attr); 2240 if (err) goto out_version; 2241 err = device_create_file(&bmc->dev->dev, 2242 &bmc->manufacturer_id_attr); 2243 if (err) goto out_add_dev; 2244 err = device_create_file(&bmc->dev->dev, 2245 &bmc->product_id_attr); 2246 if (err) goto out_manu; 2247 if (bmc->id.aux_firmware_revision_set) { 2248 err = device_create_file(&bmc->dev->dev, 2249 &bmc->aux_firmware_rev_attr); 2250 if (err) goto out_prod_id; 2251 } 2252 if (bmc->guid_set) { 2253 err = device_create_file(&bmc->dev->dev, 2254 &bmc->guid_attr); 2255 if (err) goto out_aux_firm; 2256 } 2257 2258 return 0; 2259 2260 out_aux_firm: 2261 if (bmc->id.aux_firmware_revision_set) 2262 device_remove_file(&bmc->dev->dev, 2263 &bmc->aux_firmware_rev_attr); 2264 out_prod_id: 2265 device_remove_file(&bmc->dev->dev, 2266 &bmc->product_id_attr); 2267 out_manu: 2268 device_remove_file(&bmc->dev->dev, 2269 &bmc->manufacturer_id_attr); 2270 out_add_dev: 2271 device_remove_file(&bmc->dev->dev, 2272 &bmc->add_dev_support_attr); 2273 out_version: 2274 device_remove_file(&bmc->dev->dev, 2275 &bmc->version_attr); 2276 out_firm: 2277 device_remove_file(&bmc->dev->dev, 2278 &bmc->firmware_rev_attr); 2279 out_rev: 2280 device_remove_file(&bmc->dev->dev, 2281 &bmc->revision_attr); 2282 out_sdrs: 2283 device_remove_file(&bmc->dev->dev, 2284 &bmc->provides_dev_sdrs_attr); 2285 out_devid: 2286 device_remove_file(&bmc->dev->dev, 2287 &bmc->device_id_attr); 2288 out: 2289 return err; 2290 } 2291 2292 static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum, 2293 const char *sysfs_name) 2294 { 2295 int rv; 2296 struct bmc_device *bmc = intf->bmc; 2297 struct bmc_device *old_bmc; 2298 int size; 2299 char dummy[1]; 2300 2301 mutex_lock(&ipmidriver_mutex); 2302 2303 /* 2304 * Try to find if there is an bmc_device struct 2305 * representing the interfaced BMC already 2306 */ 2307 if (bmc->guid_set) 2308 old_bmc = ipmi_find_bmc_guid(&ipmidriver, bmc->guid); 2309 else 2310 old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver, 2311 bmc->id.product_id, 2312 bmc->id.device_id); 2313 2314 /* 2315 * If there is already an bmc_device, free the new one, 2316 * otherwise register the new BMC device 2317 */ 2318 if (old_bmc) { 2319 kfree(bmc); 2320 intf->bmc = old_bmc; 2321 bmc = old_bmc; 2322 2323 kref_get(&bmc->refcount); 2324 mutex_unlock(&ipmidriver_mutex); 2325 2326 printk(KERN_INFO 2327 "ipmi: interfacing existing BMC (man_id: 0x%6.6x," 2328 " prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n", 2329 bmc->id.manufacturer_id, 2330 bmc->id.product_id, 2331 bmc->id.device_id); 2332 } else { 2333 char name[14]; 2334 unsigned char orig_dev_id = bmc->id.device_id; 2335 int warn_printed = 0; 2336 2337 snprintf(name, sizeof(name), 2338 "ipmi_bmc.%4.4x", bmc->id.product_id); 2339 2340 while (ipmi_find_bmc_prod_dev_id(&ipmidriver, 2341 bmc->id.product_id, 2342 bmc->id.device_id)) { 2343 if (!warn_printed) { 2344 printk(KERN_WARNING PFX 2345 "This machine has two different BMCs" 2346 " with the same product id and device" 2347 " id. This is an error in the" 2348 " firmware, but incrementing the" 2349 " device id to work around the problem." 2350 " Prod ID = 0x%x, Dev ID = 0x%x\n", 2351 bmc->id.product_id, bmc->id.device_id); 2352 warn_printed = 1; 2353 } 2354 bmc->id.device_id++; /* Wraps at 255 */ 2355 if (bmc->id.device_id == orig_dev_id) { 2356 printk(KERN_ERR PFX 2357 "Out of device ids!\n"); 2358 break; 2359 } 2360 } 2361 2362 bmc->dev = platform_device_alloc(name, bmc->id.device_id); 2363 if (!bmc->dev) { 2364 mutex_unlock(&ipmidriver_mutex); 2365 printk(KERN_ERR 2366 "ipmi_msghandler:" 2367 " Unable to allocate platform device\n"); 2368 return -ENOMEM; 2369 } 2370 bmc->dev->dev.driver = &ipmidriver; 2371 dev_set_drvdata(&bmc->dev->dev, bmc); 2372 kref_init(&bmc->refcount); 2373 2374 rv = platform_device_add(bmc->dev); 2375 mutex_unlock(&ipmidriver_mutex); 2376 if (rv) { 2377 platform_device_put(bmc->dev); 2378 bmc->dev = NULL; 2379 printk(KERN_ERR 2380 "ipmi_msghandler:" 2381 " Unable to register bmc device: %d\n", 2382 rv); 2383 /* Don't go to out_err, you can only do that if 2384 the device is registered already. */ 2385 return rv; 2386 } 2387 2388 rv = create_files(bmc); 2389 if (rv) { 2390 mutex_lock(&ipmidriver_mutex); 2391 platform_device_unregister(bmc->dev); 2392 mutex_unlock(&ipmidriver_mutex); 2393 2394 return rv; 2395 } 2396 2397 printk(KERN_INFO 2398 "ipmi: Found new BMC (man_id: 0x%6.6x, " 2399 " prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n", 2400 bmc->id.manufacturer_id, 2401 bmc->id.product_id, 2402 bmc->id.device_id); 2403 } 2404 2405 /* 2406 * create symlink from system interface device to bmc device 2407 * and back. 2408 */ 2409 intf->sysfs_name = kstrdup(sysfs_name, GFP_KERNEL); 2410 if (!intf->sysfs_name) { 2411 rv = -ENOMEM; 2412 printk(KERN_ERR 2413 "ipmi_msghandler: allocate link to BMC: %d\n", 2414 rv); 2415 goto out_err; 2416 } 2417 2418 rv = sysfs_create_link(&intf->si_dev->kobj, 2419 &bmc->dev->dev.kobj, intf->sysfs_name); 2420 if (rv) { 2421 kfree(intf->sysfs_name); 2422 intf->sysfs_name = NULL; 2423 printk(KERN_ERR 2424 "ipmi_msghandler: Unable to create bmc symlink: %d\n", 2425 rv); 2426 goto out_err; 2427 } 2428 2429 size = snprintf(dummy, 0, "ipmi%d", ifnum); 2430 intf->my_dev_name = kmalloc(size+1, GFP_KERNEL); 2431 if (!intf->my_dev_name) { 2432 kfree(intf->sysfs_name); 2433 intf->sysfs_name = NULL; 2434 rv = -ENOMEM; 2435 printk(KERN_ERR 2436 "ipmi_msghandler: allocate link from BMC: %d\n", 2437 rv); 2438 goto out_err; 2439 } 2440 snprintf(intf->my_dev_name, size+1, "ipmi%d", ifnum); 2441 2442 rv = sysfs_create_link(&bmc->dev->dev.kobj, &intf->si_dev->kobj, 2443 intf->my_dev_name); 2444 if (rv) { 2445 kfree(intf->sysfs_name); 2446 intf->sysfs_name = NULL; 2447 kfree(intf->my_dev_name); 2448 intf->my_dev_name = NULL; 2449 printk(KERN_ERR 2450 "ipmi_msghandler:" 2451 " Unable to create symlink to bmc: %d\n", 2452 rv); 2453 goto out_err; 2454 } 2455 2456 return 0; 2457 2458 out_err: 2459 ipmi_bmc_unregister(intf); 2460 return rv; 2461 } 2462 2463 static int 2464 send_guid_cmd(ipmi_smi_t intf, int chan) 2465 { 2466 struct kernel_ipmi_msg msg; 2467 struct ipmi_system_interface_addr si; 2468 2469 si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; 2470 si.channel = IPMI_BMC_CHANNEL; 2471 si.lun = 0; 2472 2473 msg.netfn = IPMI_NETFN_APP_REQUEST; 2474 msg.cmd = IPMI_GET_DEVICE_GUID_CMD; 2475 msg.data = NULL; 2476 msg.data_len = 0; 2477 return i_ipmi_request(NULL, 2478 intf, 2479 (struct ipmi_addr *) &si, 2480 0, 2481 &msg, 2482 intf, 2483 NULL, 2484 NULL, 2485 0, 2486 intf->channels[0].address, 2487 intf->channels[0].lun, 2488 -1, 0); 2489 } 2490 2491 static void 2492 guid_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg) 2493 { 2494 if ((msg->addr.addr_type != IPMI_SYSTEM_INTERFACE_ADDR_TYPE) 2495 || (msg->msg.netfn != IPMI_NETFN_APP_RESPONSE) 2496 || (msg->msg.cmd != IPMI_GET_DEVICE_GUID_CMD)) 2497 /* Not for me */ 2498 return; 2499 2500 if (msg->msg.data[0] != 0) { 2501 /* Error from getting the GUID, the BMC doesn't have one. */ 2502 intf->bmc->guid_set = 0; 2503 goto out; 2504 } 2505 2506 if (msg->msg.data_len < 17) { 2507 intf->bmc->guid_set = 0; 2508 printk(KERN_WARNING PFX 2509 "guid_handler: The GUID response from the BMC was too" 2510 " short, it was %d but should have been 17. Assuming" 2511 " GUID is not available.\n", 2512 msg->msg.data_len); 2513 goto out; 2514 } 2515 2516 memcpy(intf->bmc->guid, msg->msg.data, 16); 2517 intf->bmc->guid_set = 1; 2518 out: 2519 wake_up(&intf->waitq); 2520 } 2521 2522 static void 2523 get_guid(ipmi_smi_t intf) 2524 { 2525 int rv; 2526 2527 intf->bmc->guid_set = 0x2; 2528 intf->null_user_handler = guid_handler; 2529 rv = send_guid_cmd(intf, 0); 2530 if (rv) 2531 /* Send failed, no GUID available. */ 2532 intf->bmc->guid_set = 0; 2533 wait_event(intf->waitq, intf->bmc->guid_set != 2); 2534 intf->null_user_handler = NULL; 2535 } 2536 2537 static int 2538 send_channel_info_cmd(ipmi_smi_t intf, int chan) 2539 { 2540 struct kernel_ipmi_msg msg; 2541 unsigned char data[1]; 2542 struct ipmi_system_interface_addr si; 2543 2544 si.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; 2545 si.channel = IPMI_BMC_CHANNEL; 2546 si.lun = 0; 2547 2548 msg.netfn = IPMI_NETFN_APP_REQUEST; 2549 msg.cmd = IPMI_GET_CHANNEL_INFO_CMD; 2550 msg.data = data; 2551 msg.data_len = 1; 2552 data[0] = chan; 2553 return i_ipmi_request(NULL, 2554 intf, 2555 (struct ipmi_addr *) &si, 2556 0, 2557 &msg, 2558 intf, 2559 NULL, 2560 NULL, 2561 0, 2562 intf->channels[0].address, 2563 intf->channels[0].lun, 2564 -1, 0); 2565 } 2566 2567 static void 2568 channel_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg) 2569 { 2570 int rv = 0; 2571 int chan; 2572 2573 if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) 2574 && (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE) 2575 && (msg->msg.cmd == IPMI_GET_CHANNEL_INFO_CMD)) 2576 { 2577 /* It's the one we want */ 2578 if (msg->msg.data[0] != 0) { 2579 /* Got an error from the channel, just go on. */ 2580 2581 if (msg->msg.data[0] == IPMI_INVALID_COMMAND_ERR) { 2582 /* If the MC does not support this 2583 command, that is legal. We just 2584 assume it has one IPMB at channel 2585 zero. */ 2586 intf->channels[0].medium 2587 = IPMI_CHANNEL_MEDIUM_IPMB; 2588 intf->channels[0].protocol 2589 = IPMI_CHANNEL_PROTOCOL_IPMB; 2590 rv = -ENOSYS; 2591 2592 intf->curr_channel = IPMI_MAX_CHANNELS; 2593 wake_up(&intf->waitq); 2594 goto out; 2595 } 2596 goto next_channel; 2597 } 2598 if (msg->msg.data_len < 4) { 2599 /* Message not big enough, just go on. */ 2600 goto next_channel; 2601 } 2602 chan = intf->curr_channel; 2603 intf->channels[chan].medium = msg->msg.data[2] & 0x7f; 2604 intf->channels[chan].protocol = msg->msg.data[3] & 0x1f; 2605 2606 next_channel: 2607 intf->curr_channel++; 2608 if (intf->curr_channel >= IPMI_MAX_CHANNELS) 2609 wake_up(&intf->waitq); 2610 else 2611 rv = send_channel_info_cmd(intf, intf->curr_channel); 2612 2613 if (rv) { 2614 /* Got an error somehow, just give up. */ 2615 intf->curr_channel = IPMI_MAX_CHANNELS; 2616 wake_up(&intf->waitq); 2617 2618 printk(KERN_WARNING PFX 2619 "Error sending channel information: %d\n", 2620 rv); 2621 } 2622 } 2623 out: 2624 return; 2625 } 2626 2627 int ipmi_register_smi(struct ipmi_smi_handlers *handlers, 2628 void *send_info, 2629 struct ipmi_device_id *device_id, 2630 struct device *si_dev, 2631 const char *sysfs_name, 2632 unsigned char slave_addr) 2633 { 2634 int i, j; 2635 int rv; 2636 ipmi_smi_t intf; 2637 ipmi_smi_t tintf; 2638 struct list_head *link; 2639 2640 /* Make sure the driver is actually initialized, this handles 2641 problems with initialization order. */ 2642 if (!initialized) { 2643 rv = ipmi_init_msghandler(); 2644 if (rv) 2645 return rv; 2646 /* The init code doesn't return an error if it was turned 2647 off, but it won't initialize. Check that. */ 2648 if (!initialized) 2649 return -ENODEV; 2650 } 2651 2652 intf = kmalloc(sizeof(*intf), GFP_KERNEL); 2653 if (!intf) 2654 return -ENOMEM; 2655 memset(intf, 0, sizeof(*intf)); 2656 2657 intf->ipmi_version_major = ipmi_version_major(device_id); 2658 intf->ipmi_version_minor = ipmi_version_minor(device_id); 2659 2660 intf->bmc = kzalloc(sizeof(*intf->bmc), GFP_KERNEL); 2661 if (!intf->bmc) { 2662 kfree(intf); 2663 return -ENOMEM; 2664 } 2665 intf->intf_num = -1; /* Mark it invalid for now. */ 2666 kref_init(&intf->refcount); 2667 intf->bmc->id = *device_id; 2668 intf->si_dev = si_dev; 2669 for (j = 0; j < IPMI_MAX_CHANNELS; j++) { 2670 intf->channels[j].address = IPMI_BMC_SLAVE_ADDR; 2671 intf->channels[j].lun = 2; 2672 } 2673 if (slave_addr != 0) 2674 intf->channels[0].address = slave_addr; 2675 INIT_LIST_HEAD(&intf->users); 2676 intf->handlers = handlers; 2677 intf->send_info = send_info; 2678 spin_lock_init(&intf->seq_lock); 2679 for (j = 0; j < IPMI_IPMB_NUM_SEQ; j++) { 2680 intf->seq_table[j].inuse = 0; 2681 intf->seq_table[j].seqid = 0; 2682 } 2683 intf->curr_seq = 0; 2684 #ifdef CONFIG_PROC_FS 2685 spin_lock_init(&intf->proc_entry_lock); 2686 #endif 2687 spin_lock_init(&intf->waiting_msgs_lock); 2688 INIT_LIST_HEAD(&intf->waiting_msgs); 2689 spin_lock_init(&intf->events_lock); 2690 INIT_LIST_HEAD(&intf->waiting_events); 2691 intf->waiting_events_count = 0; 2692 mutex_init(&intf->cmd_rcvrs_mutex); 2693 spin_lock_init(&intf->maintenance_mode_lock); 2694 INIT_LIST_HEAD(&intf->cmd_rcvrs); 2695 init_waitqueue_head(&intf->waitq); 2696 2697 spin_lock_init(&intf->counter_lock); 2698 intf->proc_dir = NULL; 2699 2700 mutex_lock(&smi_watchers_mutex); 2701 mutex_lock(&ipmi_interfaces_mutex); 2702 /* Look for a hole in the numbers. */ 2703 i = 0; 2704 link = &ipmi_interfaces; 2705 list_for_each_entry_rcu(tintf, &ipmi_interfaces, link) { 2706 if (tintf->intf_num != i) { 2707 link = &tintf->link; 2708 break; 2709 } 2710 i++; 2711 } 2712 /* Add the new interface in numeric order. */ 2713 if (i == 0) 2714 list_add_rcu(&intf->link, &ipmi_interfaces); 2715 else 2716 list_add_tail_rcu(&intf->link, link); 2717 2718 rv = handlers->start_processing(send_info, intf); 2719 if (rv) 2720 goto out; 2721 2722 get_guid(intf); 2723 2724 if ((intf->ipmi_version_major > 1) 2725 || ((intf->ipmi_version_major == 1) 2726 && (intf->ipmi_version_minor >= 5))) 2727 { 2728 /* Start scanning the channels to see what is 2729 available. */ 2730 intf->null_user_handler = channel_handler; 2731 intf->curr_channel = 0; 2732 rv = send_channel_info_cmd(intf, 0); 2733 if (rv) 2734 goto out; 2735 2736 /* Wait for the channel info to be read. */ 2737 wait_event(intf->waitq, 2738 intf->curr_channel >= IPMI_MAX_CHANNELS); 2739 intf->null_user_handler = NULL; 2740 } else { 2741 /* Assume a single IPMB channel at zero. */ 2742 intf->channels[0].medium = IPMI_CHANNEL_MEDIUM_IPMB; 2743 intf->channels[0].protocol = IPMI_CHANNEL_PROTOCOL_IPMB; 2744 } 2745 2746 if (rv == 0) 2747 rv = add_proc_entries(intf, i); 2748 2749 rv = ipmi_bmc_register(intf, i, sysfs_name); 2750 2751 out: 2752 if (rv) { 2753 if (intf->proc_dir) 2754 remove_proc_entries(intf); 2755 intf->handlers = NULL; 2756 list_del_rcu(&intf->link); 2757 mutex_unlock(&ipmi_interfaces_mutex); 2758 mutex_unlock(&smi_watchers_mutex); 2759 synchronize_rcu(); 2760 kref_put(&intf->refcount, intf_free); 2761 } else { 2762 /* 2763 * Keep memory order straight for RCU readers. Make 2764 * sure everything else is committed to memory before 2765 * setting intf_num to mark the interface valid. 2766 */ 2767 smp_wmb(); 2768 intf->intf_num = i; 2769 mutex_unlock(&ipmi_interfaces_mutex); 2770 /* After this point the interface is legal to use. */ 2771 call_smi_watchers(i, intf->si_dev); 2772 mutex_unlock(&smi_watchers_mutex); 2773 } 2774 2775 return rv; 2776 } 2777 2778 static void cleanup_smi_msgs(ipmi_smi_t intf) 2779 { 2780 int i; 2781 struct seq_table *ent; 2782 2783 /* No need for locks, the interface is down. */ 2784 for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) { 2785 ent = &(intf->seq_table[i]); 2786 if (!ent->inuse) 2787 continue; 2788 deliver_err_response(ent->recv_msg, IPMI_ERR_UNSPECIFIED); 2789 } 2790 } 2791 2792 int ipmi_unregister_smi(ipmi_smi_t intf) 2793 { 2794 struct ipmi_smi_watcher *w; 2795 int intf_num = intf->intf_num; 2796 2797 ipmi_bmc_unregister(intf); 2798 2799 mutex_lock(&smi_watchers_mutex); 2800 mutex_lock(&ipmi_interfaces_mutex); 2801 intf->intf_num = -1; 2802 intf->handlers = NULL; 2803 list_del_rcu(&intf->link); 2804 mutex_unlock(&ipmi_interfaces_mutex); 2805 synchronize_rcu(); 2806 2807 cleanup_smi_msgs(intf); 2808 2809 remove_proc_entries(intf); 2810 2811 /* Call all the watcher interfaces to tell them that 2812 an interface is gone. */ 2813 list_for_each_entry(w, &smi_watchers, link) 2814 w->smi_gone(intf_num); 2815 mutex_unlock(&smi_watchers_mutex); 2816 2817 kref_put(&intf->refcount, intf_free); 2818 return 0; 2819 } 2820 2821 static int handle_ipmb_get_msg_rsp(ipmi_smi_t intf, 2822 struct ipmi_smi_msg *msg) 2823 { 2824 struct ipmi_ipmb_addr ipmb_addr; 2825 struct ipmi_recv_msg *recv_msg; 2826 unsigned long flags; 2827 2828 2829 /* This is 11, not 10, because the response must contain a 2830 * completion code. */ 2831 if (msg->rsp_size < 11) { 2832 /* Message not big enough, just ignore it. */ 2833 spin_lock_irqsave(&intf->counter_lock, flags); 2834 intf->invalid_ipmb_responses++; 2835 spin_unlock_irqrestore(&intf->counter_lock, flags); 2836 return 0; 2837 } 2838 2839 if (msg->rsp[2] != 0) { 2840 /* An error getting the response, just ignore it. */ 2841 return 0; 2842 } 2843 2844 ipmb_addr.addr_type = IPMI_IPMB_ADDR_TYPE; 2845 ipmb_addr.slave_addr = msg->rsp[6]; 2846 ipmb_addr.channel = msg->rsp[3] & 0x0f; 2847 ipmb_addr.lun = msg->rsp[7] & 3; 2848 2849 /* It's a response from a remote entity. Look up the sequence 2850 number and handle the response. */ 2851 if (intf_find_seq(intf, 2852 msg->rsp[7] >> 2, 2853 msg->rsp[3] & 0x0f, 2854 msg->rsp[8], 2855 (msg->rsp[4] >> 2) & (~1), 2856 (struct ipmi_addr *) &(ipmb_addr), 2857 &recv_msg)) 2858 { 2859 /* We were unable to find the sequence number, 2860 so just nuke the message. */ 2861 spin_lock_irqsave(&intf->counter_lock, flags); 2862 intf->unhandled_ipmb_responses++; 2863 spin_unlock_irqrestore(&intf->counter_lock, flags); 2864 return 0; 2865 } 2866 2867 memcpy(recv_msg->msg_data, 2868 &(msg->rsp[9]), 2869 msg->rsp_size - 9); 2870 /* THe other fields matched, so no need to set them, except 2871 for netfn, which needs to be the response that was 2872 returned, not the request value. */ 2873 recv_msg->msg.netfn = msg->rsp[4] >> 2; 2874 recv_msg->msg.data = recv_msg->msg_data; 2875 recv_msg->msg.data_len = msg->rsp_size - 10; 2876 recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE; 2877 spin_lock_irqsave(&intf->counter_lock, flags); 2878 intf->handled_ipmb_responses++; 2879 spin_unlock_irqrestore(&intf->counter_lock, flags); 2880 deliver_response(recv_msg); 2881 2882 return 0; 2883 } 2884 2885 static int handle_ipmb_get_msg_cmd(ipmi_smi_t intf, 2886 struct ipmi_smi_msg *msg) 2887 { 2888 struct cmd_rcvr *rcvr; 2889 int rv = 0; 2890 unsigned char netfn; 2891 unsigned char cmd; 2892 unsigned char chan; 2893 ipmi_user_t user = NULL; 2894 struct ipmi_ipmb_addr *ipmb_addr; 2895 struct ipmi_recv_msg *recv_msg; 2896 unsigned long flags; 2897 struct ipmi_smi_handlers *handlers; 2898 2899 if (msg->rsp_size < 10) { 2900 /* Message not big enough, just ignore it. */ 2901 spin_lock_irqsave(&intf->counter_lock, flags); 2902 intf->invalid_commands++; 2903 spin_unlock_irqrestore(&intf->counter_lock, flags); 2904 return 0; 2905 } 2906 2907 if (msg->rsp[2] != 0) { 2908 /* An error getting the response, just ignore it. */ 2909 return 0; 2910 } 2911 2912 netfn = msg->rsp[4] >> 2; 2913 cmd = msg->rsp[8]; 2914 chan = msg->rsp[3] & 0xf; 2915 2916 rcu_read_lock(); 2917 rcvr = find_cmd_rcvr(intf, netfn, cmd, chan); 2918 if (rcvr) { 2919 user = rcvr->user; 2920 kref_get(&user->refcount); 2921 } else 2922 user = NULL; 2923 rcu_read_unlock(); 2924 2925 if (user == NULL) { 2926 /* We didn't find a user, deliver an error response. */ 2927 spin_lock_irqsave(&intf->counter_lock, flags); 2928 intf->unhandled_commands++; 2929 spin_unlock_irqrestore(&intf->counter_lock, flags); 2930 2931 msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); 2932 msg->data[1] = IPMI_SEND_MSG_CMD; 2933 msg->data[2] = msg->rsp[3]; 2934 msg->data[3] = msg->rsp[6]; 2935 msg->data[4] = ((netfn + 1) << 2) | (msg->rsp[7] & 0x3); 2936 msg->data[5] = ipmb_checksum(&(msg->data[3]), 2); 2937 msg->data[6] = intf->channels[msg->rsp[3] & 0xf].address; 2938 /* rqseq/lun */ 2939 msg->data[7] = (msg->rsp[7] & 0xfc) | (msg->rsp[4] & 0x3); 2940 msg->data[8] = msg->rsp[8]; /* cmd */ 2941 msg->data[9] = IPMI_INVALID_CMD_COMPLETION_CODE; 2942 msg->data[10] = ipmb_checksum(&(msg->data[6]), 4); 2943 msg->data_size = 11; 2944 2945 #ifdef DEBUG_MSGING 2946 { 2947 int m; 2948 printk("Invalid command:"); 2949 for (m = 0; m < msg->data_size; m++) 2950 printk(" %2.2x", msg->data[m]); 2951 printk("\n"); 2952 } 2953 #endif 2954 rcu_read_lock(); 2955 handlers = intf->handlers; 2956 if (handlers) { 2957 handlers->sender(intf->send_info, msg, 0); 2958 /* We used the message, so return the value 2959 that causes it to not be freed or 2960 queued. */ 2961 rv = -1; 2962 } 2963 rcu_read_unlock(); 2964 } else { 2965 /* Deliver the message to the user. */ 2966 spin_lock_irqsave(&intf->counter_lock, flags); 2967 intf->handled_commands++; 2968 spin_unlock_irqrestore(&intf->counter_lock, flags); 2969 2970 recv_msg = ipmi_alloc_recv_msg(); 2971 if (!recv_msg) { 2972 /* We couldn't allocate memory for the 2973 message, so requeue it for handling 2974 later. */ 2975 rv = 1; 2976 kref_put(&user->refcount, free_user); 2977 } else { 2978 /* Extract the source address from the data. */ 2979 ipmb_addr = (struct ipmi_ipmb_addr *) &recv_msg->addr; 2980 ipmb_addr->addr_type = IPMI_IPMB_ADDR_TYPE; 2981 ipmb_addr->slave_addr = msg->rsp[6]; 2982 ipmb_addr->lun = msg->rsp[7] & 3; 2983 ipmb_addr->channel = msg->rsp[3] & 0xf; 2984 2985 /* Extract the rest of the message information 2986 from the IPMB header.*/ 2987 recv_msg->user = user; 2988 recv_msg->recv_type = IPMI_CMD_RECV_TYPE; 2989 recv_msg->msgid = msg->rsp[7] >> 2; 2990 recv_msg->msg.netfn = msg->rsp[4] >> 2; 2991 recv_msg->msg.cmd = msg->rsp[8]; 2992 recv_msg->msg.data = recv_msg->msg_data; 2993 2994 /* We chop off 10, not 9 bytes because the checksum 2995 at the end also needs to be removed. */ 2996 recv_msg->msg.data_len = msg->rsp_size - 10; 2997 memcpy(recv_msg->msg_data, 2998 &(msg->rsp[9]), 2999 msg->rsp_size - 10); 3000 deliver_response(recv_msg); 3001 } 3002 } 3003 3004 return rv; 3005 } 3006 3007 static int handle_lan_get_msg_rsp(ipmi_smi_t intf, 3008 struct ipmi_smi_msg *msg) 3009 { 3010 struct ipmi_lan_addr lan_addr; 3011 struct ipmi_recv_msg *recv_msg; 3012 unsigned long flags; 3013 3014 3015 /* This is 13, not 12, because the response must contain a 3016 * completion code. */ 3017 if (msg->rsp_size < 13) { 3018 /* Message not big enough, just ignore it. */ 3019 spin_lock_irqsave(&intf->counter_lock, flags); 3020 intf->invalid_lan_responses++; 3021 spin_unlock_irqrestore(&intf->counter_lock, flags); 3022 return 0; 3023 } 3024 3025 if (msg->rsp[2] != 0) { 3026 /* An error getting the response, just ignore it. */ 3027 return 0; 3028 } 3029 3030 lan_addr.addr_type = IPMI_LAN_ADDR_TYPE; 3031 lan_addr.session_handle = msg->rsp[4]; 3032 lan_addr.remote_SWID = msg->rsp[8]; 3033 lan_addr.local_SWID = msg->rsp[5]; 3034 lan_addr.channel = msg->rsp[3] & 0x0f; 3035 lan_addr.privilege = msg->rsp[3] >> 4; 3036 lan_addr.lun = msg->rsp[9] & 3; 3037 3038 /* It's a response from a remote entity. Look up the sequence 3039 number and handle the response. */ 3040 if (intf_find_seq(intf, 3041 msg->rsp[9] >> 2, 3042 msg->rsp[3] & 0x0f, 3043 msg->rsp[10], 3044 (msg->rsp[6] >> 2) & (~1), 3045 (struct ipmi_addr *) &(lan_addr), 3046 &recv_msg)) 3047 { 3048 /* We were unable to find the sequence number, 3049 so just nuke the message. */ 3050 spin_lock_irqsave(&intf->counter_lock, flags); 3051 intf->unhandled_lan_responses++; 3052 spin_unlock_irqrestore(&intf->counter_lock, flags); 3053 return 0; 3054 } 3055 3056 memcpy(recv_msg->msg_data, 3057 &(msg->rsp[11]), 3058 msg->rsp_size - 11); 3059 /* The other fields matched, so no need to set them, except 3060 for netfn, which needs to be the response that was 3061 returned, not the request value. */ 3062 recv_msg->msg.netfn = msg->rsp[6] >> 2; 3063 recv_msg->msg.data = recv_msg->msg_data; 3064 recv_msg->msg.data_len = msg->rsp_size - 12; 3065 recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE; 3066 spin_lock_irqsave(&intf->counter_lock, flags); 3067 intf->handled_lan_responses++; 3068 spin_unlock_irqrestore(&intf->counter_lock, flags); 3069 deliver_response(recv_msg); 3070 3071 return 0; 3072 } 3073 3074 static int handle_lan_get_msg_cmd(ipmi_smi_t intf, 3075 struct ipmi_smi_msg *msg) 3076 { 3077 struct cmd_rcvr *rcvr; 3078 int rv = 0; 3079 unsigned char netfn; 3080 unsigned char cmd; 3081 unsigned char chan; 3082 ipmi_user_t user = NULL; 3083 struct ipmi_lan_addr *lan_addr; 3084 struct ipmi_recv_msg *recv_msg; 3085 unsigned long flags; 3086 3087 if (msg->rsp_size < 12) { 3088 /* Message not big enough, just ignore it. */ 3089 spin_lock_irqsave(&intf->counter_lock, flags); 3090 intf->invalid_commands++; 3091 spin_unlock_irqrestore(&intf->counter_lock, flags); 3092 return 0; 3093 } 3094 3095 if (msg->rsp[2] != 0) { 3096 /* An error getting the response, just ignore it. */ 3097 return 0; 3098 } 3099 3100 netfn = msg->rsp[6] >> 2; 3101 cmd = msg->rsp[10]; 3102 chan = msg->rsp[3] & 0xf; 3103 3104 rcu_read_lock(); 3105 rcvr = find_cmd_rcvr(intf, netfn, cmd, chan); 3106 if (rcvr) { 3107 user = rcvr->user; 3108 kref_get(&user->refcount); 3109 } else 3110 user = NULL; 3111 rcu_read_unlock(); 3112 3113 if (user == NULL) { 3114 /* We didn't find a user, just give up. */ 3115 spin_lock_irqsave(&intf->counter_lock, flags); 3116 intf->unhandled_commands++; 3117 spin_unlock_irqrestore(&intf->counter_lock, flags); 3118 3119 rv = 0; /* Don't do anything with these messages, just 3120 allow them to be freed. */ 3121 } else { 3122 /* Deliver the message to the user. */ 3123 spin_lock_irqsave(&intf->counter_lock, flags); 3124 intf->handled_commands++; 3125 spin_unlock_irqrestore(&intf->counter_lock, flags); 3126 3127 recv_msg = ipmi_alloc_recv_msg(); 3128 if (!recv_msg) { 3129 /* We couldn't allocate memory for the 3130 message, so requeue it for handling 3131 later. */ 3132 rv = 1; 3133 kref_put(&user->refcount, free_user); 3134 } else { 3135 /* Extract the source address from the data. */ 3136 lan_addr = (struct ipmi_lan_addr *) &recv_msg->addr; 3137 lan_addr->addr_type = IPMI_LAN_ADDR_TYPE; 3138 lan_addr->session_handle = msg->rsp[4]; 3139 lan_addr->remote_SWID = msg->rsp[8]; 3140 lan_addr->local_SWID = msg->rsp[5]; 3141 lan_addr->lun = msg->rsp[9] & 3; 3142 lan_addr->channel = msg->rsp[3] & 0xf; 3143 lan_addr->privilege = msg->rsp[3] >> 4; 3144 3145 /* Extract the rest of the message information 3146 from the IPMB header.*/ 3147 recv_msg->user = user; 3148 recv_msg->recv_type = IPMI_CMD_RECV_TYPE; 3149 recv_msg->msgid = msg->rsp[9] >> 2; 3150 recv_msg->msg.netfn = msg->rsp[6] >> 2; 3151 recv_msg->msg.cmd = msg->rsp[10]; 3152 recv_msg->msg.data = recv_msg->msg_data; 3153 3154 /* We chop off 12, not 11 bytes because the checksum 3155 at the end also needs to be removed. */ 3156 recv_msg->msg.data_len = msg->rsp_size - 12; 3157 memcpy(recv_msg->msg_data, 3158 &(msg->rsp[11]), 3159 msg->rsp_size - 12); 3160 deliver_response(recv_msg); 3161 } 3162 } 3163 3164 return rv; 3165 } 3166 3167 static void copy_event_into_recv_msg(struct ipmi_recv_msg *recv_msg, 3168 struct ipmi_smi_msg *msg) 3169 { 3170 struct ipmi_system_interface_addr *smi_addr; 3171 3172 recv_msg->msgid = 0; 3173 smi_addr = (struct ipmi_system_interface_addr *) &(recv_msg->addr); 3174 smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; 3175 smi_addr->channel = IPMI_BMC_CHANNEL; 3176 smi_addr->lun = msg->rsp[0] & 3; 3177 recv_msg->recv_type = IPMI_ASYNC_EVENT_RECV_TYPE; 3178 recv_msg->msg.netfn = msg->rsp[0] >> 2; 3179 recv_msg->msg.cmd = msg->rsp[1]; 3180 memcpy(recv_msg->msg_data, &(msg->rsp[3]), msg->rsp_size - 3); 3181 recv_msg->msg.data = recv_msg->msg_data; 3182 recv_msg->msg.data_len = msg->rsp_size - 3; 3183 } 3184 3185 static int handle_read_event_rsp(ipmi_smi_t intf, 3186 struct ipmi_smi_msg *msg) 3187 { 3188 struct ipmi_recv_msg *recv_msg, *recv_msg2; 3189 struct list_head msgs; 3190 ipmi_user_t user; 3191 int rv = 0; 3192 int deliver_count = 0; 3193 unsigned long flags; 3194 3195 if (msg->rsp_size < 19) { 3196 /* Message is too small to be an IPMB event. */ 3197 spin_lock_irqsave(&intf->counter_lock, flags); 3198 intf->invalid_events++; 3199 spin_unlock_irqrestore(&intf->counter_lock, flags); 3200 return 0; 3201 } 3202 3203 if (msg->rsp[2] != 0) { 3204 /* An error getting the event, just ignore it. */ 3205 return 0; 3206 } 3207 3208 INIT_LIST_HEAD(&msgs); 3209 3210 spin_lock_irqsave(&intf->events_lock, flags); 3211 3212 spin_lock(&intf->counter_lock); 3213 intf->events++; 3214 spin_unlock(&intf->counter_lock); 3215 3216 /* Allocate and fill in one message for every user that is getting 3217 events. */ 3218 rcu_read_lock(); 3219 list_for_each_entry_rcu(user, &intf->users, link) { 3220 if (!user->gets_events) 3221 continue; 3222 3223 recv_msg = ipmi_alloc_recv_msg(); 3224 if (!recv_msg) { 3225 rcu_read_unlock(); 3226 list_for_each_entry_safe(recv_msg, recv_msg2, &msgs, 3227 link) { 3228 list_del(&recv_msg->link); 3229 ipmi_free_recv_msg(recv_msg); 3230 } 3231 /* We couldn't allocate memory for the 3232 message, so requeue it for handling 3233 later. */ 3234 rv = 1; 3235 goto out; 3236 } 3237 3238 deliver_count++; 3239 3240 copy_event_into_recv_msg(recv_msg, msg); 3241 recv_msg->user = user; 3242 kref_get(&user->refcount); 3243 list_add_tail(&(recv_msg->link), &msgs); 3244 } 3245 rcu_read_unlock(); 3246 3247 if (deliver_count) { 3248 /* Now deliver all the messages. */ 3249 list_for_each_entry_safe(recv_msg, recv_msg2, &msgs, link) { 3250 list_del(&recv_msg->link); 3251 deliver_response(recv_msg); 3252 } 3253 } else if (intf->waiting_events_count < MAX_EVENTS_IN_QUEUE) { 3254 /* No one to receive the message, put it in queue if there's 3255 not already too many things in the queue. */ 3256 recv_msg = ipmi_alloc_recv_msg(); 3257 if (!recv_msg) { 3258 /* We couldn't allocate memory for the 3259 message, so requeue it for handling 3260 later. */ 3261 rv = 1; 3262 goto out; 3263 } 3264 3265 copy_event_into_recv_msg(recv_msg, msg); 3266 list_add_tail(&(recv_msg->link), &(intf->waiting_events)); 3267 intf->waiting_events_count++; 3268 } else { 3269 /* There's too many things in the queue, discard this 3270 message. */ 3271 printk(KERN_WARNING PFX "Event queue full, discarding an" 3272 " incoming event\n"); 3273 } 3274 3275 out: 3276 spin_unlock_irqrestore(&(intf->events_lock), flags); 3277 3278 return rv; 3279 } 3280 3281 static int handle_bmc_rsp(ipmi_smi_t intf, 3282 struct ipmi_smi_msg *msg) 3283 { 3284 struct ipmi_recv_msg *recv_msg; 3285 unsigned long flags; 3286 struct ipmi_user *user; 3287 3288 recv_msg = (struct ipmi_recv_msg *) msg->user_data; 3289 if (recv_msg == NULL) 3290 { 3291 printk(KERN_WARNING"IPMI message received with no owner. This\n" 3292 "could be because of a malformed message, or\n" 3293 "because of a hardware error. Contact your\n" 3294 "hardware vender for assistance\n"); 3295 return 0; 3296 } 3297 3298 user = recv_msg->user; 3299 /* Make sure the user still exists. */ 3300 if (user && !user->valid) { 3301 /* The user for the message went away, so give up. */ 3302 spin_lock_irqsave(&intf->counter_lock, flags); 3303 intf->unhandled_local_responses++; 3304 spin_unlock_irqrestore(&intf->counter_lock, flags); 3305 ipmi_free_recv_msg(recv_msg); 3306 } else { 3307 struct ipmi_system_interface_addr *smi_addr; 3308 3309 spin_lock_irqsave(&intf->counter_lock, flags); 3310 intf->handled_local_responses++; 3311 spin_unlock_irqrestore(&intf->counter_lock, flags); 3312 recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE; 3313 recv_msg->msgid = msg->msgid; 3314 smi_addr = ((struct ipmi_system_interface_addr *) 3315 &(recv_msg->addr)); 3316 smi_addr->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; 3317 smi_addr->channel = IPMI_BMC_CHANNEL; 3318 smi_addr->lun = msg->rsp[0] & 3; 3319 recv_msg->msg.netfn = msg->rsp[0] >> 2; 3320 recv_msg->msg.cmd = msg->rsp[1]; 3321 memcpy(recv_msg->msg_data, 3322 &(msg->rsp[2]), 3323 msg->rsp_size - 2); 3324 recv_msg->msg.data = recv_msg->msg_data; 3325 recv_msg->msg.data_len = msg->rsp_size - 2; 3326 deliver_response(recv_msg); 3327 } 3328 3329 return 0; 3330 } 3331 3332 /* Handle a new message. Return 1 if the message should be requeued, 3333 0 if the message should be freed, or -1 if the message should not 3334 be freed or requeued. */ 3335 static int handle_new_recv_msg(ipmi_smi_t intf, 3336 struct ipmi_smi_msg *msg) 3337 { 3338 int requeue; 3339 int chan; 3340 3341 #ifdef DEBUG_MSGING 3342 int m; 3343 printk("Recv:"); 3344 for (m = 0; m < msg->rsp_size; m++) 3345 printk(" %2.2x", msg->rsp[m]); 3346 printk("\n"); 3347 #endif 3348 if (msg->rsp_size < 2) { 3349 /* Message is too small to be correct. */ 3350 printk(KERN_WARNING PFX "BMC returned to small a message" 3351 " for netfn %x cmd %x, got %d bytes\n", 3352 (msg->data[0] >> 2) | 1, msg->data[1], msg->rsp_size); 3353 3354 /* Generate an error response for the message. */ 3355 msg->rsp[0] = msg->data[0] | (1 << 2); 3356 msg->rsp[1] = msg->data[1]; 3357 msg->rsp[2] = IPMI_ERR_UNSPECIFIED; 3358 msg->rsp_size = 3; 3359 } else if (((msg->rsp[0] >> 2) != ((msg->data[0] >> 2) | 1))/* Netfn */ 3360 || (msg->rsp[1] != msg->data[1])) /* Command */ 3361 { 3362 /* The response is not even marginally correct. */ 3363 printk(KERN_WARNING PFX "BMC returned incorrect response," 3364 " expected netfn %x cmd %x, got netfn %x cmd %x\n", 3365 (msg->data[0] >> 2) | 1, msg->data[1], 3366 msg->rsp[0] >> 2, msg->rsp[1]); 3367 3368 /* Generate an error response for the message. */ 3369 msg->rsp[0] = msg->data[0] | (1 << 2); 3370 msg->rsp[1] = msg->data[1]; 3371 msg->rsp[2] = IPMI_ERR_UNSPECIFIED; 3372 msg->rsp_size = 3; 3373 } 3374 3375 if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2)) 3376 && (msg->rsp[1] == IPMI_SEND_MSG_CMD) 3377 && (msg->user_data != NULL)) 3378 { 3379 /* It's a response to a response we sent. For this we 3380 deliver a send message response to the user. */ 3381 struct ipmi_recv_msg *recv_msg = msg->user_data; 3382 3383 requeue = 0; 3384 if (msg->rsp_size < 2) 3385 /* Message is too small to be correct. */ 3386 goto out; 3387 3388 chan = msg->data[2] & 0x0f; 3389 if (chan >= IPMI_MAX_CHANNELS) 3390 /* Invalid channel number */ 3391 goto out; 3392 3393 if (!recv_msg) 3394 goto out; 3395 3396 /* Make sure the user still exists. */ 3397 if (!recv_msg->user || !recv_msg->user->valid) 3398 goto out; 3399 3400 recv_msg->recv_type = IPMI_RESPONSE_RESPONSE_TYPE; 3401 recv_msg->msg.data = recv_msg->msg_data; 3402 recv_msg->msg.data_len = 1; 3403 recv_msg->msg_data[0] = msg->rsp[2]; 3404 deliver_response(recv_msg); 3405 } else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2)) 3406 && (msg->rsp[1] == IPMI_GET_MSG_CMD)) 3407 { 3408 /* It's from the receive queue. */ 3409 chan = msg->rsp[3] & 0xf; 3410 if (chan >= IPMI_MAX_CHANNELS) { 3411 /* Invalid channel number */ 3412 requeue = 0; 3413 goto out; 3414 } 3415 3416 switch (intf->channels[chan].medium) { 3417 case IPMI_CHANNEL_MEDIUM_IPMB: 3418 if (msg->rsp[4] & 0x04) { 3419 /* It's a response, so find the 3420 requesting message and send it up. */ 3421 requeue = handle_ipmb_get_msg_rsp(intf, msg); 3422 } else { 3423 /* It's a command to the SMS from some other 3424 entity. Handle that. */ 3425 requeue = handle_ipmb_get_msg_cmd(intf, msg); 3426 } 3427 break; 3428 3429 case IPMI_CHANNEL_MEDIUM_8023LAN: 3430 case IPMI_CHANNEL_MEDIUM_ASYNC: 3431 if (msg->rsp[6] & 0x04) { 3432 /* It's a response, so find the 3433 requesting message and send it up. */ 3434 requeue = handle_lan_get_msg_rsp(intf, msg); 3435 } else { 3436 /* It's a command to the SMS from some other 3437 entity. Handle that. */ 3438 requeue = handle_lan_get_msg_cmd(intf, msg); 3439 } 3440 break; 3441 3442 default: 3443 /* We don't handle the channel type, so just 3444 * free the message. */ 3445 requeue = 0; 3446 } 3447 3448 } else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2)) 3449 && (msg->rsp[1] == IPMI_READ_EVENT_MSG_BUFFER_CMD)) 3450 { 3451 /* It's an asyncronous event. */ 3452 requeue = handle_read_event_rsp(intf, msg); 3453 } else { 3454 /* It's a response from the local BMC. */ 3455 requeue = handle_bmc_rsp(intf, msg); 3456 } 3457 3458 out: 3459 return requeue; 3460 } 3461 3462 /* Handle a new message from the lower layer. */ 3463 void ipmi_smi_msg_received(ipmi_smi_t intf, 3464 struct ipmi_smi_msg *msg) 3465 { 3466 unsigned long flags; 3467 int rv; 3468 3469 3470 if ((msg->data_size >= 2) 3471 && (msg->data[0] == (IPMI_NETFN_APP_REQUEST << 2)) 3472 && (msg->data[1] == IPMI_SEND_MSG_CMD) 3473 && (msg->user_data == NULL)) 3474 { 3475 /* This is the local response to a command send, start 3476 the timer for these. The user_data will not be 3477 NULL if this is a response send, and we will let 3478 response sends just go through. */ 3479 3480 /* Check for errors, if we get certain errors (ones 3481 that mean basically we can try again later), we 3482 ignore them and start the timer. Otherwise we 3483 report the error immediately. */ 3484 if ((msg->rsp_size >= 3) && (msg->rsp[2] != 0) 3485 && (msg->rsp[2] != IPMI_NODE_BUSY_ERR) 3486 && (msg->rsp[2] != IPMI_LOST_ARBITRATION_ERR) 3487 && (msg->rsp[2] != IPMI_BUS_ERR) 3488 && (msg->rsp[2] != IPMI_NAK_ON_WRITE_ERR)) 3489 { 3490 int chan = msg->rsp[3] & 0xf; 3491 3492 /* Got an error sending the message, handle it. */ 3493 spin_lock_irqsave(&intf->counter_lock, flags); 3494 if (chan >= IPMI_MAX_CHANNELS) 3495 ; /* This shouldn't happen */ 3496 else if ((intf->channels[chan].medium 3497 == IPMI_CHANNEL_MEDIUM_8023LAN) 3498 || (intf->channels[chan].medium 3499 == IPMI_CHANNEL_MEDIUM_ASYNC)) 3500 intf->sent_lan_command_errs++; 3501 else 3502 intf->sent_ipmb_command_errs++; 3503 spin_unlock_irqrestore(&intf->counter_lock, flags); 3504 intf_err_seq(intf, msg->msgid, msg->rsp[2]); 3505 } else { 3506 /* The message was sent, start the timer. */ 3507 intf_start_seq_timer(intf, msg->msgid); 3508 } 3509 3510 ipmi_free_smi_msg(msg); 3511 goto out; 3512 } 3513 3514 /* To preserve message order, if the list is not empty, we 3515 tack this message onto the end of the list. */ 3516 spin_lock_irqsave(&intf->waiting_msgs_lock, flags); 3517 if (!list_empty(&intf->waiting_msgs)) { 3518 list_add_tail(&msg->link, &intf->waiting_msgs); 3519 spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags); 3520 goto out; 3521 } 3522 spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags); 3523 3524 rv = handle_new_recv_msg(intf, msg); 3525 if (rv > 0) { 3526 /* Could not handle the message now, just add it to a 3527 list to handle later. */ 3528 spin_lock_irqsave(&intf->waiting_msgs_lock, flags); 3529 list_add_tail(&msg->link, &intf->waiting_msgs); 3530 spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags); 3531 } else if (rv == 0) { 3532 ipmi_free_smi_msg(msg); 3533 } 3534 3535 out: 3536 return; 3537 } 3538 3539 void ipmi_smi_watchdog_pretimeout(ipmi_smi_t intf) 3540 { 3541 ipmi_user_t user; 3542 3543 rcu_read_lock(); 3544 list_for_each_entry_rcu(user, &intf->users, link) { 3545 if (!user->handler->ipmi_watchdog_pretimeout) 3546 continue; 3547 3548 user->handler->ipmi_watchdog_pretimeout(user->handler_data); 3549 } 3550 rcu_read_unlock(); 3551 } 3552 3553 3554 static struct ipmi_smi_msg * 3555 smi_from_recv_msg(ipmi_smi_t intf, struct ipmi_recv_msg *recv_msg, 3556 unsigned char seq, long seqid) 3557 { 3558 struct ipmi_smi_msg *smi_msg = ipmi_alloc_smi_msg(); 3559 if (!smi_msg) 3560 /* If we can't allocate the message, then just return, we 3561 get 4 retries, so this should be ok. */ 3562 return NULL; 3563 3564 memcpy(smi_msg->data, recv_msg->msg.data, recv_msg->msg.data_len); 3565 smi_msg->data_size = recv_msg->msg.data_len; 3566 smi_msg->msgid = STORE_SEQ_IN_MSGID(seq, seqid); 3567 3568 #ifdef DEBUG_MSGING 3569 { 3570 int m; 3571 printk("Resend: "); 3572 for (m = 0; m < smi_msg->data_size; m++) 3573 printk(" %2.2x", smi_msg->data[m]); 3574 printk("\n"); 3575 } 3576 #endif 3577 return smi_msg; 3578 } 3579 3580 static void check_msg_timeout(ipmi_smi_t intf, struct seq_table *ent, 3581 struct list_head *timeouts, long timeout_period, 3582 int slot, unsigned long *flags) 3583 { 3584 struct ipmi_recv_msg *msg; 3585 struct ipmi_smi_handlers *handlers; 3586 3587 if (intf->intf_num == -1) 3588 return; 3589 3590 if (!ent->inuse) 3591 return; 3592 3593 ent->timeout -= timeout_period; 3594 if (ent->timeout > 0) 3595 return; 3596 3597 if (ent->retries_left == 0) { 3598 /* The message has used all its retries. */ 3599 ent->inuse = 0; 3600 msg = ent->recv_msg; 3601 list_add_tail(&msg->link, timeouts); 3602 spin_lock(&intf->counter_lock); 3603 if (ent->broadcast) 3604 intf->timed_out_ipmb_broadcasts++; 3605 else if (ent->recv_msg->addr.addr_type == IPMI_LAN_ADDR_TYPE) 3606 intf->timed_out_lan_commands++; 3607 else 3608 intf->timed_out_ipmb_commands++; 3609 spin_unlock(&intf->counter_lock); 3610 } else { 3611 struct ipmi_smi_msg *smi_msg; 3612 /* More retries, send again. */ 3613 3614 /* Start with the max timer, set to normal 3615 timer after the message is sent. */ 3616 ent->timeout = MAX_MSG_TIMEOUT; 3617 ent->retries_left--; 3618 spin_lock(&intf->counter_lock); 3619 if (ent->recv_msg->addr.addr_type == IPMI_LAN_ADDR_TYPE) 3620 intf->retransmitted_lan_commands++; 3621 else 3622 intf->retransmitted_ipmb_commands++; 3623 spin_unlock(&intf->counter_lock); 3624 3625 smi_msg = smi_from_recv_msg(intf, ent->recv_msg, slot, 3626 ent->seqid); 3627 if (!smi_msg) 3628 return; 3629 3630 spin_unlock_irqrestore(&intf->seq_lock, *flags); 3631 3632 /* Send the new message. We send with a zero 3633 * priority. It timed out, I doubt time is 3634 * that critical now, and high priority 3635 * messages are really only for messages to the 3636 * local MC, which don't get resent. */ 3637 handlers = intf->handlers; 3638 if (handlers) 3639 intf->handlers->sender(intf->send_info, 3640 smi_msg, 0); 3641 else 3642 ipmi_free_smi_msg(smi_msg); 3643 3644 spin_lock_irqsave(&intf->seq_lock, *flags); 3645 } 3646 } 3647 3648 static void ipmi_timeout_handler(long timeout_period) 3649 { 3650 ipmi_smi_t intf; 3651 struct list_head timeouts; 3652 struct ipmi_recv_msg *msg, *msg2; 3653 struct ipmi_smi_msg *smi_msg, *smi_msg2; 3654 unsigned long flags; 3655 int i; 3656 3657 rcu_read_lock(); 3658 list_for_each_entry_rcu(intf, &ipmi_interfaces, link) { 3659 /* See if any waiting messages need to be processed. */ 3660 spin_lock_irqsave(&intf->waiting_msgs_lock, flags); 3661 list_for_each_entry_safe(smi_msg, smi_msg2, 3662 &intf->waiting_msgs, link) { 3663 if (!handle_new_recv_msg(intf, smi_msg)) { 3664 list_del(&smi_msg->link); 3665 ipmi_free_smi_msg(smi_msg); 3666 } else { 3667 /* To preserve message order, quit if we 3668 can't handle a message. */ 3669 break; 3670 } 3671 } 3672 spin_unlock_irqrestore(&intf->waiting_msgs_lock, flags); 3673 3674 /* Go through the seq table and find any messages that 3675 have timed out, putting them in the timeouts 3676 list. */ 3677 INIT_LIST_HEAD(&timeouts); 3678 spin_lock_irqsave(&intf->seq_lock, flags); 3679 for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) 3680 check_msg_timeout(intf, &(intf->seq_table[i]), 3681 &timeouts, timeout_period, i, 3682 &flags); 3683 spin_unlock_irqrestore(&intf->seq_lock, flags); 3684 3685 list_for_each_entry_safe(msg, msg2, &timeouts, link) 3686 deliver_err_response(msg, IPMI_TIMEOUT_COMPLETION_CODE); 3687 3688 /* 3689 * Maintenance mode handling. Check the timeout 3690 * optimistically before we claim the lock. It may 3691 * mean a timeout gets missed occasionally, but that 3692 * only means the timeout gets extended by one period 3693 * in that case. No big deal, and it avoids the lock 3694 * most of the time. 3695 */ 3696 if (intf->auto_maintenance_timeout > 0) { 3697 spin_lock_irqsave(&intf->maintenance_mode_lock, flags); 3698 if (intf->auto_maintenance_timeout > 0) { 3699 intf->auto_maintenance_timeout 3700 -= timeout_period; 3701 if (!intf->maintenance_mode 3702 && (intf->auto_maintenance_timeout <= 0)) 3703 { 3704 intf->maintenance_mode_enable = 0; 3705 maintenance_mode_update(intf); 3706 } 3707 } 3708 spin_unlock_irqrestore(&intf->maintenance_mode_lock, 3709 flags); 3710 } 3711 } 3712 rcu_read_unlock(); 3713 } 3714 3715 static void ipmi_request_event(void) 3716 { 3717 ipmi_smi_t intf; 3718 struct ipmi_smi_handlers *handlers; 3719 3720 rcu_read_lock(); 3721 /* Called from the timer, no need to check if handlers is 3722 * valid. */ 3723 list_for_each_entry_rcu(intf, &ipmi_interfaces, link) { 3724 /* No event requests when in maintenance mode. */ 3725 if (intf->maintenance_mode_enable) 3726 continue; 3727 3728 handlers = intf->handlers; 3729 if (handlers) 3730 handlers->request_events(intf->send_info); 3731 } 3732 rcu_read_unlock(); 3733 } 3734 3735 static struct timer_list ipmi_timer; 3736 3737 /* Call every ~100 ms. */ 3738 #define IPMI_TIMEOUT_TIME 100 3739 3740 /* How many jiffies does it take to get to the timeout time. */ 3741 #define IPMI_TIMEOUT_JIFFIES ((IPMI_TIMEOUT_TIME * HZ) / 1000) 3742 3743 /* Request events from the queue every second (this is the number of 3744 IPMI_TIMEOUT_TIMES between event requests). Hopefully, in the 3745 future, IPMI will add a way to know immediately if an event is in 3746 the queue and this silliness can go away. */ 3747 #define IPMI_REQUEST_EV_TIME (1000 / (IPMI_TIMEOUT_TIME)) 3748 3749 static atomic_t stop_operation; 3750 static unsigned int ticks_to_req_ev = IPMI_REQUEST_EV_TIME; 3751 3752 static void ipmi_timeout(unsigned long data) 3753 { 3754 if (atomic_read(&stop_operation)) 3755 return; 3756 3757 ticks_to_req_ev--; 3758 if (ticks_to_req_ev == 0) { 3759 ipmi_request_event(); 3760 ticks_to_req_ev = IPMI_REQUEST_EV_TIME; 3761 } 3762 3763 ipmi_timeout_handler(IPMI_TIMEOUT_TIME); 3764 3765 mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES); 3766 } 3767 3768 3769 static atomic_t smi_msg_inuse_count = ATOMIC_INIT(0); 3770 static atomic_t recv_msg_inuse_count = ATOMIC_INIT(0); 3771 3772 /* FIXME - convert these to slabs. */ 3773 static void free_smi_msg(struct ipmi_smi_msg *msg) 3774 { 3775 atomic_dec(&smi_msg_inuse_count); 3776 kfree(msg); 3777 } 3778 3779 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void) 3780 { 3781 struct ipmi_smi_msg *rv; 3782 rv = kmalloc(sizeof(struct ipmi_smi_msg), GFP_ATOMIC); 3783 if (rv) { 3784 rv->done = free_smi_msg; 3785 rv->user_data = NULL; 3786 atomic_inc(&smi_msg_inuse_count); 3787 } 3788 return rv; 3789 } 3790 3791 static void free_recv_msg(struct ipmi_recv_msg *msg) 3792 { 3793 atomic_dec(&recv_msg_inuse_count); 3794 kfree(msg); 3795 } 3796 3797 struct ipmi_recv_msg *ipmi_alloc_recv_msg(void) 3798 { 3799 struct ipmi_recv_msg *rv; 3800 3801 rv = kmalloc(sizeof(struct ipmi_recv_msg), GFP_ATOMIC); 3802 if (rv) { 3803 rv->user = NULL; 3804 rv->done = free_recv_msg; 3805 atomic_inc(&recv_msg_inuse_count); 3806 } 3807 return rv; 3808 } 3809 3810 void ipmi_free_recv_msg(struct ipmi_recv_msg *msg) 3811 { 3812 if (msg->user) 3813 kref_put(&msg->user->refcount, free_user); 3814 msg->done(msg); 3815 } 3816 3817 #ifdef CONFIG_IPMI_PANIC_EVENT 3818 3819 static void dummy_smi_done_handler(struct ipmi_smi_msg *msg) 3820 { 3821 } 3822 3823 static void dummy_recv_done_handler(struct ipmi_recv_msg *msg) 3824 { 3825 } 3826 3827 #ifdef CONFIG_IPMI_PANIC_STRING 3828 static void event_receiver_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg) 3829 { 3830 if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) 3831 && (msg->msg.netfn == IPMI_NETFN_SENSOR_EVENT_RESPONSE) 3832 && (msg->msg.cmd == IPMI_GET_EVENT_RECEIVER_CMD) 3833 && (msg->msg.data[0] == IPMI_CC_NO_ERROR)) 3834 { 3835 /* A get event receiver command, save it. */ 3836 intf->event_receiver = msg->msg.data[1]; 3837 intf->event_receiver_lun = msg->msg.data[2] & 0x3; 3838 } 3839 } 3840 3841 static void device_id_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg) 3842 { 3843 if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE) 3844 && (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE) 3845 && (msg->msg.cmd == IPMI_GET_DEVICE_ID_CMD) 3846 && (msg->msg.data[0] == IPMI_CC_NO_ERROR)) 3847 { 3848 /* A get device id command, save if we are an event 3849 receiver or generator. */ 3850 intf->local_sel_device = (msg->msg.data[6] >> 2) & 1; 3851 intf->local_event_generator = (msg->msg.data[6] >> 5) & 1; 3852 } 3853 } 3854 #endif 3855 3856 static void send_panic_events(char *str) 3857 { 3858 struct kernel_ipmi_msg msg; 3859 ipmi_smi_t intf; 3860 unsigned char data[16]; 3861 struct ipmi_system_interface_addr *si; 3862 struct ipmi_addr addr; 3863 struct ipmi_smi_msg smi_msg; 3864 struct ipmi_recv_msg recv_msg; 3865 3866 si = (struct ipmi_system_interface_addr *) &addr; 3867 si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; 3868 si->channel = IPMI_BMC_CHANNEL; 3869 si->lun = 0; 3870 3871 /* Fill in an event telling that we have failed. */ 3872 msg.netfn = 0x04; /* Sensor or Event. */ 3873 msg.cmd = 2; /* Platform event command. */ 3874 msg.data = data; 3875 msg.data_len = 8; 3876 data[0] = 0x41; /* Kernel generator ID, IPMI table 5-4 */ 3877 data[1] = 0x03; /* This is for IPMI 1.0. */ 3878 data[2] = 0x20; /* OS Critical Stop, IPMI table 36-3 */ 3879 data[4] = 0x6f; /* Sensor specific, IPMI table 36-1 */ 3880 data[5] = 0xa1; /* Runtime stop OEM bytes 2 & 3. */ 3881 3882 /* Put a few breadcrumbs in. Hopefully later we can add more things 3883 to make the panic events more useful. */ 3884 if (str) { 3885 data[3] = str[0]; 3886 data[6] = str[1]; 3887 data[7] = str[2]; 3888 } 3889 3890 smi_msg.done = dummy_smi_done_handler; 3891 recv_msg.done = dummy_recv_done_handler; 3892 3893 /* For every registered interface, send the event. */ 3894 list_for_each_entry_rcu(intf, &ipmi_interfaces, link) { 3895 if (!intf->handlers) 3896 /* Interface is not ready. */ 3897 continue; 3898 3899 /* Send the event announcing the panic. */ 3900 intf->handlers->set_run_to_completion(intf->send_info, 1); 3901 i_ipmi_request(NULL, 3902 intf, 3903 &addr, 3904 0, 3905 &msg, 3906 intf, 3907 &smi_msg, 3908 &recv_msg, 3909 0, 3910 intf->channels[0].address, 3911 intf->channels[0].lun, 3912 0, 1); /* Don't retry, and don't wait. */ 3913 } 3914 3915 #ifdef CONFIG_IPMI_PANIC_STRING 3916 /* On every interface, dump a bunch of OEM event holding the 3917 string. */ 3918 if (!str) 3919 return; 3920 3921 /* For every registered interface, send the event. */ 3922 list_for_each_entry_rcu(intf, &ipmi_interfaces, link) { 3923 char *p = str; 3924 struct ipmi_ipmb_addr *ipmb; 3925 int j; 3926 3927 if (intf->intf_num == -1) 3928 /* Interface was not ready yet. */ 3929 continue; 3930 3931 /* 3932 * intf_num is used as an marker to tell if the 3933 * interface is valid. Thus we need a read barrier to 3934 * make sure data fetched before checking intf_num 3935 * won't be used. 3936 */ 3937 smp_rmb(); 3938 3939 /* First job here is to figure out where to send the 3940 OEM events. There's no way in IPMI to send OEM 3941 events using an event send command, so we have to 3942 find the SEL to put them in and stick them in 3943 there. */ 3944 3945 /* Get capabilities from the get device id. */ 3946 intf->local_sel_device = 0; 3947 intf->local_event_generator = 0; 3948 intf->event_receiver = 0; 3949 3950 /* Request the device info from the local MC. */ 3951 msg.netfn = IPMI_NETFN_APP_REQUEST; 3952 msg.cmd = IPMI_GET_DEVICE_ID_CMD; 3953 msg.data = NULL; 3954 msg.data_len = 0; 3955 intf->null_user_handler = device_id_fetcher; 3956 i_ipmi_request(NULL, 3957 intf, 3958 &addr, 3959 0, 3960 &msg, 3961 intf, 3962 &smi_msg, 3963 &recv_msg, 3964 0, 3965 intf->channels[0].address, 3966 intf->channels[0].lun, 3967 0, 1); /* Don't retry, and don't wait. */ 3968 3969 if (intf->local_event_generator) { 3970 /* Request the event receiver from the local MC. */ 3971 msg.netfn = IPMI_NETFN_SENSOR_EVENT_REQUEST; 3972 msg.cmd = IPMI_GET_EVENT_RECEIVER_CMD; 3973 msg.data = NULL; 3974 msg.data_len = 0; 3975 intf->null_user_handler = event_receiver_fetcher; 3976 i_ipmi_request(NULL, 3977 intf, 3978 &addr, 3979 0, 3980 &msg, 3981 intf, 3982 &smi_msg, 3983 &recv_msg, 3984 0, 3985 intf->channels[0].address, 3986 intf->channels[0].lun, 3987 0, 1); /* no retry, and no wait. */ 3988 } 3989 intf->null_user_handler = NULL; 3990 3991 /* Validate the event receiver. The low bit must not 3992 be 1 (it must be a valid IPMB address), it cannot 3993 be zero, and it must not be my address. */ 3994 if (((intf->event_receiver & 1) == 0) 3995 && (intf->event_receiver != 0) 3996 && (intf->event_receiver != intf->channels[0].address)) 3997 { 3998 /* The event receiver is valid, send an IPMB 3999 message. */ 4000 ipmb = (struct ipmi_ipmb_addr *) &addr; 4001 ipmb->addr_type = IPMI_IPMB_ADDR_TYPE; 4002 ipmb->channel = 0; /* FIXME - is this right? */ 4003 ipmb->lun = intf->event_receiver_lun; 4004 ipmb->slave_addr = intf->event_receiver; 4005 } else if (intf->local_sel_device) { 4006 /* The event receiver was not valid (or was 4007 me), but I am an SEL device, just dump it 4008 in my SEL. */ 4009 si = (struct ipmi_system_interface_addr *) &addr; 4010 si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; 4011 si->channel = IPMI_BMC_CHANNEL; 4012 si->lun = 0; 4013 } else 4014 continue; /* No where to send the event. */ 4015 4016 4017 msg.netfn = IPMI_NETFN_STORAGE_REQUEST; /* Storage. */ 4018 msg.cmd = IPMI_ADD_SEL_ENTRY_CMD; 4019 msg.data = data; 4020 msg.data_len = 16; 4021 4022 j = 0; 4023 while (*p) { 4024 int size = strlen(p); 4025 4026 if (size > 11) 4027 size = 11; 4028 data[0] = 0; 4029 data[1] = 0; 4030 data[2] = 0xf0; /* OEM event without timestamp. */ 4031 data[3] = intf->channels[0].address; 4032 data[4] = j++; /* sequence # */ 4033 /* Always give 11 bytes, so strncpy will fill 4034 it with zeroes for me. */ 4035 strncpy(data+5, p, 11); 4036 p += size; 4037 4038 i_ipmi_request(NULL, 4039 intf, 4040 &addr, 4041 0, 4042 &msg, 4043 intf, 4044 &smi_msg, 4045 &recv_msg, 4046 0, 4047 intf->channels[0].address, 4048 intf->channels[0].lun, 4049 0, 1); /* no retry, and no wait. */ 4050 } 4051 } 4052 #endif /* CONFIG_IPMI_PANIC_STRING */ 4053 } 4054 #endif /* CONFIG_IPMI_PANIC_EVENT */ 4055 4056 static int has_panicked; 4057 4058 static int panic_event(struct notifier_block *this, 4059 unsigned long event, 4060 void *ptr) 4061 { 4062 ipmi_smi_t intf; 4063 4064 if (has_panicked) 4065 return NOTIFY_DONE; 4066 has_panicked = 1; 4067 4068 /* For every registered interface, set it to run to completion. */ 4069 list_for_each_entry_rcu(intf, &ipmi_interfaces, link) { 4070 if (!intf->handlers) 4071 /* Interface is not ready. */ 4072 continue; 4073 4074 intf->handlers->set_run_to_completion(intf->send_info, 1); 4075 } 4076 4077 #ifdef CONFIG_IPMI_PANIC_EVENT 4078 send_panic_events(ptr); 4079 #endif 4080 4081 return NOTIFY_DONE; 4082 } 4083 4084 static struct notifier_block panic_block = { 4085 .notifier_call = panic_event, 4086 .next = NULL, 4087 .priority = 200 /* priority: INT_MAX >= x >= 0 */ 4088 }; 4089 4090 static int ipmi_init_msghandler(void) 4091 { 4092 int rv; 4093 4094 if (initialized) 4095 return 0; 4096 4097 rv = driver_register(&ipmidriver); 4098 if (rv) { 4099 printk(KERN_ERR PFX "Could not register IPMI driver\n"); 4100 return rv; 4101 } 4102 4103 printk(KERN_INFO "ipmi message handler version " 4104 IPMI_DRIVER_VERSION "\n"); 4105 4106 #ifdef CONFIG_PROC_FS 4107 proc_ipmi_root = proc_mkdir("ipmi", NULL); 4108 if (!proc_ipmi_root) { 4109 printk(KERN_ERR PFX "Unable to create IPMI proc dir"); 4110 return -ENOMEM; 4111 } 4112 4113 proc_ipmi_root->owner = THIS_MODULE; 4114 #endif /* CONFIG_PROC_FS */ 4115 4116 setup_timer(&ipmi_timer, ipmi_timeout, 0); 4117 mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES); 4118 4119 atomic_notifier_chain_register(&panic_notifier_list, &panic_block); 4120 4121 initialized = 1; 4122 4123 return 0; 4124 } 4125 4126 static __init int ipmi_init_msghandler_mod(void) 4127 { 4128 ipmi_init_msghandler(); 4129 return 0; 4130 } 4131 4132 static __exit void cleanup_ipmi(void) 4133 { 4134 int count; 4135 4136 if (!initialized) 4137 return; 4138 4139 atomic_notifier_chain_unregister(&panic_notifier_list, &panic_block); 4140 4141 /* This can't be called if any interfaces exist, so no worry about 4142 shutting down the interfaces. */ 4143 4144 /* Tell the timer to stop, then wait for it to stop. This avoids 4145 problems with race conditions removing the timer here. */ 4146 atomic_inc(&stop_operation); 4147 del_timer_sync(&ipmi_timer); 4148 4149 #ifdef CONFIG_PROC_FS 4150 remove_proc_entry(proc_ipmi_root->name, &proc_root); 4151 #endif /* CONFIG_PROC_FS */ 4152 4153 driver_unregister(&ipmidriver); 4154 4155 initialized = 0; 4156 4157 /* Check for buffer leaks. */ 4158 count = atomic_read(&smi_msg_inuse_count); 4159 if (count != 0) 4160 printk(KERN_WARNING PFX "SMI message count %d at exit\n", 4161 count); 4162 count = atomic_read(&recv_msg_inuse_count); 4163 if (count != 0) 4164 printk(KERN_WARNING PFX "recv message count %d at exit\n", 4165 count); 4166 } 4167 module_exit(cleanup_ipmi); 4168 4169 module_init(ipmi_init_msghandler_mod); 4170 MODULE_LICENSE("GPL"); 4171 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); 4172 MODULE_DESCRIPTION("Incoming and outgoing message routing for an IPMI interface."); 4173 MODULE_VERSION(IPMI_DRIVER_VERSION); 4174 4175 EXPORT_SYMBOL(ipmi_create_user); 4176 EXPORT_SYMBOL(ipmi_destroy_user); 4177 EXPORT_SYMBOL(ipmi_get_version); 4178 EXPORT_SYMBOL(ipmi_request_settime); 4179 EXPORT_SYMBOL(ipmi_request_supply_msgs); 4180 EXPORT_SYMBOL(ipmi_register_smi); 4181 EXPORT_SYMBOL(ipmi_unregister_smi); 4182 EXPORT_SYMBOL(ipmi_register_for_cmd); 4183 EXPORT_SYMBOL(ipmi_unregister_for_cmd); 4184 EXPORT_SYMBOL(ipmi_smi_msg_received); 4185 EXPORT_SYMBOL(ipmi_smi_watchdog_pretimeout); 4186 EXPORT_SYMBOL(ipmi_alloc_smi_msg); 4187 EXPORT_SYMBOL(ipmi_addr_length); 4188 EXPORT_SYMBOL(ipmi_validate_addr); 4189 EXPORT_SYMBOL(ipmi_set_gets_events); 4190 EXPORT_SYMBOL(ipmi_smi_watcher_register); 4191 EXPORT_SYMBOL(ipmi_smi_watcher_unregister); 4192 EXPORT_SYMBOL(ipmi_set_my_address); 4193 EXPORT_SYMBOL(ipmi_get_my_address); 4194 EXPORT_SYMBOL(ipmi_set_my_LUN); 4195 EXPORT_SYMBOL(ipmi_get_my_LUN); 4196 EXPORT_SYMBOL(ipmi_smi_add_proc_entry); 4197 EXPORT_SYMBOL(ipmi_user_set_run_to_completion); 4198 EXPORT_SYMBOL(ipmi_free_recv_msg); 4199