1 /* 2 * ipmi_si.c 3 * 4 * The interface to the IPMI driver for the system interfaces (KCS, SMIC, 5 * BT). 6 * 7 * Author: MontaVista Software, Inc. 8 * Corey Minyard <minyard@mvista.com> 9 * source@mvista.com 10 * 11 * Copyright 2002 MontaVista Software Inc. 12 * Copyright 2006 IBM Corp., Christian Krafft <krafft@de.ibm.com> 13 * 14 * This program is free software; you can redistribute it and/or modify it 15 * under the terms of the GNU General Public License as published by the 16 * Free Software Foundation; either version 2 of the License, or (at your 17 * option) any later version. 18 * 19 * 20 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 21 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 26 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 28 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 29 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * You should have received a copy of the GNU General Public License along 32 * with this program; if not, write to the Free Software Foundation, Inc., 33 * 675 Mass Ave, Cambridge, MA 02139, USA. 34 */ 35 36 /* 37 * This file holds the "policy" for the interface to the SMI state 38 * machine. It does the configuration, handles timers and interrupts, 39 * and drives the real SMI state machine. 40 */ 41 42 #include <linux/module.h> 43 #include <linux/moduleparam.h> 44 #include <asm/system.h> 45 #include <linux/sched.h> 46 #include <linux/timer.h> 47 #include <linux/errno.h> 48 #include <linux/spinlock.h> 49 #include <linux/slab.h> 50 #include <linux/delay.h> 51 #include <linux/list.h> 52 #include <linux/pci.h> 53 #include <linux/ioport.h> 54 #include <linux/notifier.h> 55 #include <linux/mutex.h> 56 #include <linux/kthread.h> 57 #include <asm/irq.h> 58 #include <linux/interrupt.h> 59 #include <linux/rcupdate.h> 60 #include <linux/ipmi.h> 61 #include <linux/ipmi_smi.h> 62 #include <asm/io.h> 63 #include "ipmi_si_sm.h" 64 #include <linux/init.h> 65 #include <linux/dmi.h> 66 #include <linux/string.h> 67 #include <linux/ctype.h> 68 #include <linux/pnp.h> 69 #include <linux/of_device.h> 70 #include <linux/of_platform.h> 71 #include <linux/of_address.h> 72 #include <linux/of_irq.h> 73 74 #define PFX "ipmi_si: " 75 76 /* Measure times between events in the driver. */ 77 #undef DEBUG_TIMING 78 79 /* Call every 10 ms. */ 80 #define SI_TIMEOUT_TIME_USEC 10000 81 #define SI_USEC_PER_JIFFY (1000000/HZ) 82 #define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY) 83 #define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a 84 short timeout */ 85 86 enum si_intf_state { 87 SI_NORMAL, 88 SI_GETTING_FLAGS, 89 SI_GETTING_EVENTS, 90 SI_CLEARING_FLAGS, 91 SI_CLEARING_FLAGS_THEN_SET_IRQ, 92 SI_GETTING_MESSAGES, 93 SI_ENABLE_INTERRUPTS1, 94 SI_ENABLE_INTERRUPTS2, 95 SI_DISABLE_INTERRUPTS1, 96 SI_DISABLE_INTERRUPTS2 97 /* FIXME - add watchdog stuff. */ 98 }; 99 100 /* Some BT-specific defines we need here. */ 101 #define IPMI_BT_INTMASK_REG 2 102 #define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2 103 #define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1 104 105 enum si_type { 106 SI_KCS, SI_SMIC, SI_BT 107 }; 108 static char *si_to_str[] = { "kcs", "smic", "bt" }; 109 110 static char *ipmi_addr_src_to_str[] = { NULL, "hotmod", "hardcoded", "SPMI", 111 "ACPI", "SMBIOS", "PCI", 112 "device-tree", "default" }; 113 114 #define DEVICE_NAME "ipmi_si" 115 116 static struct platform_driver ipmi_driver; 117 118 /* 119 * Indexes into stats[] in smi_info below. 120 */ 121 enum si_stat_indexes { 122 /* 123 * Number of times the driver requested a timer while an operation 124 * was in progress. 125 */ 126 SI_STAT_short_timeouts = 0, 127 128 /* 129 * Number of times the driver requested a timer while nothing was in 130 * progress. 131 */ 132 SI_STAT_long_timeouts, 133 134 /* Number of times the interface was idle while being polled. */ 135 SI_STAT_idles, 136 137 /* Number of interrupts the driver handled. */ 138 SI_STAT_interrupts, 139 140 /* Number of time the driver got an ATTN from the hardware. */ 141 SI_STAT_attentions, 142 143 /* Number of times the driver requested flags from the hardware. */ 144 SI_STAT_flag_fetches, 145 146 /* Number of times the hardware didn't follow the state machine. */ 147 SI_STAT_hosed_count, 148 149 /* Number of completed messages. */ 150 SI_STAT_complete_transactions, 151 152 /* Number of IPMI events received from the hardware. */ 153 SI_STAT_events, 154 155 /* Number of watchdog pretimeouts. */ 156 SI_STAT_watchdog_pretimeouts, 157 158 /* Number of asyncronous messages received. */ 159 SI_STAT_incoming_messages, 160 161 162 /* This *must* remain last, add new values above this. */ 163 SI_NUM_STATS 164 }; 165 166 struct smi_info { 167 int intf_num; 168 ipmi_smi_t intf; 169 struct si_sm_data *si_sm; 170 struct si_sm_handlers *handlers; 171 enum si_type si_type; 172 spinlock_t si_lock; 173 spinlock_t msg_lock; 174 struct list_head xmit_msgs; 175 struct list_head hp_xmit_msgs; 176 struct ipmi_smi_msg *curr_msg; 177 enum si_intf_state si_state; 178 179 /* 180 * Used to handle the various types of I/O that can occur with 181 * IPMI 182 */ 183 struct si_sm_io io; 184 int (*io_setup)(struct smi_info *info); 185 void (*io_cleanup)(struct smi_info *info); 186 int (*irq_setup)(struct smi_info *info); 187 void (*irq_cleanup)(struct smi_info *info); 188 unsigned int io_size; 189 enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */ 190 void (*addr_source_cleanup)(struct smi_info *info); 191 void *addr_source_data; 192 193 /* 194 * Per-OEM handler, called from handle_flags(). Returns 1 195 * when handle_flags() needs to be re-run or 0 indicating it 196 * set si_state itself. 197 */ 198 int (*oem_data_avail_handler)(struct smi_info *smi_info); 199 200 /* 201 * Flags from the last GET_MSG_FLAGS command, used when an ATTN 202 * is set to hold the flags until we are done handling everything 203 * from the flags. 204 */ 205 #define RECEIVE_MSG_AVAIL 0x01 206 #define EVENT_MSG_BUFFER_FULL 0x02 207 #define WDT_PRE_TIMEOUT_INT 0x08 208 #define OEM0_DATA_AVAIL 0x20 209 #define OEM1_DATA_AVAIL 0x40 210 #define OEM2_DATA_AVAIL 0x80 211 #define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \ 212 OEM1_DATA_AVAIL | \ 213 OEM2_DATA_AVAIL) 214 unsigned char msg_flags; 215 216 /* Does the BMC have an event buffer? */ 217 char has_event_buffer; 218 219 /* 220 * If set to true, this will request events the next time the 221 * state machine is idle. 222 */ 223 atomic_t req_events; 224 225 /* 226 * If true, run the state machine to completion on every send 227 * call. Generally used after a panic to make sure stuff goes 228 * out. 229 */ 230 int run_to_completion; 231 232 /* The I/O port of an SI interface. */ 233 int port; 234 235 /* 236 * The space between start addresses of the two ports. For 237 * instance, if the first port is 0xca2 and the spacing is 4, then 238 * the second port is 0xca6. 239 */ 240 unsigned int spacing; 241 242 /* zero if no irq; */ 243 int irq; 244 245 /* The timer for this si. */ 246 struct timer_list si_timer; 247 248 /* The time (in jiffies) the last timeout occurred at. */ 249 unsigned long last_timeout_jiffies; 250 251 /* Used to gracefully stop the timer without race conditions. */ 252 atomic_t stop_operation; 253 254 /* 255 * The driver will disable interrupts when it gets into a 256 * situation where it cannot handle messages due to lack of 257 * memory. Once that situation clears up, it will re-enable 258 * interrupts. 259 */ 260 int interrupt_disabled; 261 262 /* From the get device id response... */ 263 struct ipmi_device_id device_id; 264 265 /* Driver model stuff. */ 266 struct device *dev; 267 struct platform_device *pdev; 268 269 /* 270 * True if we allocated the device, false if it came from 271 * someplace else (like PCI). 272 */ 273 int dev_registered; 274 275 /* Slave address, could be reported from DMI. */ 276 unsigned char slave_addr; 277 278 /* Counters and things for the proc filesystem. */ 279 atomic_t stats[SI_NUM_STATS]; 280 281 struct task_struct *thread; 282 283 struct list_head link; 284 union ipmi_smi_info_union addr_info; 285 }; 286 287 #define smi_inc_stat(smi, stat) \ 288 atomic_inc(&(smi)->stats[SI_STAT_ ## stat]) 289 #define smi_get_stat(smi, stat) \ 290 ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat])) 291 292 #define SI_MAX_PARMS 4 293 294 static int force_kipmid[SI_MAX_PARMS]; 295 static int num_force_kipmid; 296 #ifdef CONFIG_PCI 297 static int pci_registered; 298 #endif 299 #ifdef CONFIG_ACPI 300 static int pnp_registered; 301 #endif 302 303 static unsigned int kipmid_max_busy_us[SI_MAX_PARMS]; 304 static int num_max_busy_us; 305 306 static int unload_when_empty = 1; 307 308 static int add_smi(struct smi_info *smi); 309 static int try_smi_init(struct smi_info *smi); 310 static void cleanup_one_si(struct smi_info *to_clean); 311 static void cleanup_ipmi_si(void); 312 313 static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list); 314 static int register_xaction_notifier(struct notifier_block *nb) 315 { 316 return atomic_notifier_chain_register(&xaction_notifier_list, nb); 317 } 318 319 static void deliver_recv_msg(struct smi_info *smi_info, 320 struct ipmi_smi_msg *msg) 321 { 322 /* Deliver the message to the upper layer with the lock 323 released. */ 324 325 if (smi_info->run_to_completion) { 326 ipmi_smi_msg_received(smi_info->intf, msg); 327 } else { 328 spin_unlock(&(smi_info->si_lock)); 329 ipmi_smi_msg_received(smi_info->intf, msg); 330 spin_lock(&(smi_info->si_lock)); 331 } 332 } 333 334 static void return_hosed_msg(struct smi_info *smi_info, int cCode) 335 { 336 struct ipmi_smi_msg *msg = smi_info->curr_msg; 337 338 if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED) 339 cCode = IPMI_ERR_UNSPECIFIED; 340 /* else use it as is */ 341 342 /* Make it a reponse */ 343 msg->rsp[0] = msg->data[0] | 4; 344 msg->rsp[1] = msg->data[1]; 345 msg->rsp[2] = cCode; 346 msg->rsp_size = 3; 347 348 smi_info->curr_msg = NULL; 349 deliver_recv_msg(smi_info, msg); 350 } 351 352 static enum si_sm_result start_next_msg(struct smi_info *smi_info) 353 { 354 int rv; 355 struct list_head *entry = NULL; 356 #ifdef DEBUG_TIMING 357 struct timeval t; 358 #endif 359 360 /* 361 * No need to save flags, we aleady have interrupts off and we 362 * already hold the SMI lock. 363 */ 364 if (!smi_info->run_to_completion) 365 spin_lock(&(smi_info->msg_lock)); 366 367 /* Pick the high priority queue first. */ 368 if (!list_empty(&(smi_info->hp_xmit_msgs))) { 369 entry = smi_info->hp_xmit_msgs.next; 370 } else if (!list_empty(&(smi_info->xmit_msgs))) { 371 entry = smi_info->xmit_msgs.next; 372 } 373 374 if (!entry) { 375 smi_info->curr_msg = NULL; 376 rv = SI_SM_IDLE; 377 } else { 378 int err; 379 380 list_del(entry); 381 smi_info->curr_msg = list_entry(entry, 382 struct ipmi_smi_msg, 383 link); 384 #ifdef DEBUG_TIMING 385 do_gettimeofday(&t); 386 printk(KERN_DEBUG "**Start2: %d.%9.9d\n", t.tv_sec, t.tv_usec); 387 #endif 388 err = atomic_notifier_call_chain(&xaction_notifier_list, 389 0, smi_info); 390 if (err & NOTIFY_STOP_MASK) { 391 rv = SI_SM_CALL_WITHOUT_DELAY; 392 goto out; 393 } 394 err = smi_info->handlers->start_transaction( 395 smi_info->si_sm, 396 smi_info->curr_msg->data, 397 smi_info->curr_msg->data_size); 398 if (err) 399 return_hosed_msg(smi_info, err); 400 401 rv = SI_SM_CALL_WITHOUT_DELAY; 402 } 403 out: 404 if (!smi_info->run_to_completion) 405 spin_unlock(&(smi_info->msg_lock)); 406 407 return rv; 408 } 409 410 static void start_enable_irq(struct smi_info *smi_info) 411 { 412 unsigned char msg[2]; 413 414 /* 415 * If we are enabling interrupts, we have to tell the 416 * BMC to use them. 417 */ 418 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 419 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; 420 421 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); 422 smi_info->si_state = SI_ENABLE_INTERRUPTS1; 423 } 424 425 static void start_disable_irq(struct smi_info *smi_info) 426 { 427 unsigned char msg[2]; 428 429 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 430 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; 431 432 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); 433 smi_info->si_state = SI_DISABLE_INTERRUPTS1; 434 } 435 436 static void start_clear_flags(struct smi_info *smi_info) 437 { 438 unsigned char msg[3]; 439 440 /* Make sure the watchdog pre-timeout flag is not set at startup. */ 441 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 442 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; 443 msg[2] = WDT_PRE_TIMEOUT_INT; 444 445 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); 446 smi_info->si_state = SI_CLEARING_FLAGS; 447 } 448 449 /* 450 * When we have a situtaion where we run out of memory and cannot 451 * allocate messages, we just leave them in the BMC and run the system 452 * polled until we can allocate some memory. Once we have some 453 * memory, we will re-enable the interrupt. 454 */ 455 static inline void disable_si_irq(struct smi_info *smi_info) 456 { 457 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) { 458 start_disable_irq(smi_info); 459 smi_info->interrupt_disabled = 1; 460 if (!atomic_read(&smi_info->stop_operation)) 461 mod_timer(&smi_info->si_timer, 462 jiffies + SI_TIMEOUT_JIFFIES); 463 } 464 } 465 466 static inline void enable_si_irq(struct smi_info *smi_info) 467 { 468 if ((smi_info->irq) && (smi_info->interrupt_disabled)) { 469 start_enable_irq(smi_info); 470 smi_info->interrupt_disabled = 0; 471 } 472 } 473 474 static void handle_flags(struct smi_info *smi_info) 475 { 476 retry: 477 if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) { 478 /* Watchdog pre-timeout */ 479 smi_inc_stat(smi_info, watchdog_pretimeouts); 480 481 start_clear_flags(smi_info); 482 smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; 483 spin_unlock(&(smi_info->si_lock)); 484 ipmi_smi_watchdog_pretimeout(smi_info->intf); 485 spin_lock(&(smi_info->si_lock)); 486 } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) { 487 /* Messages available. */ 488 smi_info->curr_msg = ipmi_alloc_smi_msg(); 489 if (!smi_info->curr_msg) { 490 disable_si_irq(smi_info); 491 smi_info->si_state = SI_NORMAL; 492 return; 493 } 494 enable_si_irq(smi_info); 495 496 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); 497 smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD; 498 smi_info->curr_msg->data_size = 2; 499 500 smi_info->handlers->start_transaction( 501 smi_info->si_sm, 502 smi_info->curr_msg->data, 503 smi_info->curr_msg->data_size); 504 smi_info->si_state = SI_GETTING_MESSAGES; 505 } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) { 506 /* Events available. */ 507 smi_info->curr_msg = ipmi_alloc_smi_msg(); 508 if (!smi_info->curr_msg) { 509 disable_si_irq(smi_info); 510 smi_info->si_state = SI_NORMAL; 511 return; 512 } 513 enable_si_irq(smi_info); 514 515 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); 516 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; 517 smi_info->curr_msg->data_size = 2; 518 519 smi_info->handlers->start_transaction( 520 smi_info->si_sm, 521 smi_info->curr_msg->data, 522 smi_info->curr_msg->data_size); 523 smi_info->si_state = SI_GETTING_EVENTS; 524 } else if (smi_info->msg_flags & OEM_DATA_AVAIL && 525 smi_info->oem_data_avail_handler) { 526 if (smi_info->oem_data_avail_handler(smi_info)) 527 goto retry; 528 } else 529 smi_info->si_state = SI_NORMAL; 530 } 531 532 static void handle_transaction_done(struct smi_info *smi_info) 533 { 534 struct ipmi_smi_msg *msg; 535 #ifdef DEBUG_TIMING 536 struct timeval t; 537 538 do_gettimeofday(&t); 539 printk(KERN_DEBUG "**Done: %d.%9.9d\n", t.tv_sec, t.tv_usec); 540 #endif 541 switch (smi_info->si_state) { 542 case SI_NORMAL: 543 if (!smi_info->curr_msg) 544 break; 545 546 smi_info->curr_msg->rsp_size 547 = smi_info->handlers->get_result( 548 smi_info->si_sm, 549 smi_info->curr_msg->rsp, 550 IPMI_MAX_MSG_LENGTH); 551 552 /* 553 * Do this here becase deliver_recv_msg() releases the 554 * lock, and a new message can be put in during the 555 * time the lock is released. 556 */ 557 msg = smi_info->curr_msg; 558 smi_info->curr_msg = NULL; 559 deliver_recv_msg(smi_info, msg); 560 break; 561 562 case SI_GETTING_FLAGS: 563 { 564 unsigned char msg[4]; 565 unsigned int len; 566 567 /* We got the flags from the SMI, now handle them. */ 568 len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4); 569 if (msg[2] != 0) { 570 /* Error fetching flags, just give up for now. */ 571 smi_info->si_state = SI_NORMAL; 572 } else if (len < 4) { 573 /* 574 * Hmm, no flags. That's technically illegal, but 575 * don't use uninitialized data. 576 */ 577 smi_info->si_state = SI_NORMAL; 578 } else { 579 smi_info->msg_flags = msg[3]; 580 handle_flags(smi_info); 581 } 582 break; 583 } 584 585 case SI_CLEARING_FLAGS: 586 case SI_CLEARING_FLAGS_THEN_SET_IRQ: 587 { 588 unsigned char msg[3]; 589 590 /* We cleared the flags. */ 591 smi_info->handlers->get_result(smi_info->si_sm, msg, 3); 592 if (msg[2] != 0) { 593 /* Error clearing flags */ 594 dev_warn(smi_info->dev, 595 "Error clearing flags: %2.2x\n", msg[2]); 596 } 597 if (smi_info->si_state == SI_CLEARING_FLAGS_THEN_SET_IRQ) 598 start_enable_irq(smi_info); 599 else 600 smi_info->si_state = SI_NORMAL; 601 break; 602 } 603 604 case SI_GETTING_EVENTS: 605 { 606 smi_info->curr_msg->rsp_size 607 = smi_info->handlers->get_result( 608 smi_info->si_sm, 609 smi_info->curr_msg->rsp, 610 IPMI_MAX_MSG_LENGTH); 611 612 /* 613 * Do this here becase deliver_recv_msg() releases the 614 * lock, and a new message can be put in during the 615 * time the lock is released. 616 */ 617 msg = smi_info->curr_msg; 618 smi_info->curr_msg = NULL; 619 if (msg->rsp[2] != 0) { 620 /* Error getting event, probably done. */ 621 msg->done(msg); 622 623 /* Take off the event flag. */ 624 smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; 625 handle_flags(smi_info); 626 } else { 627 smi_inc_stat(smi_info, events); 628 629 /* 630 * Do this before we deliver the message 631 * because delivering the message releases the 632 * lock and something else can mess with the 633 * state. 634 */ 635 handle_flags(smi_info); 636 637 deliver_recv_msg(smi_info, msg); 638 } 639 break; 640 } 641 642 case SI_GETTING_MESSAGES: 643 { 644 smi_info->curr_msg->rsp_size 645 = smi_info->handlers->get_result( 646 smi_info->si_sm, 647 smi_info->curr_msg->rsp, 648 IPMI_MAX_MSG_LENGTH); 649 650 /* 651 * Do this here becase deliver_recv_msg() releases the 652 * lock, and a new message can be put in during the 653 * time the lock is released. 654 */ 655 msg = smi_info->curr_msg; 656 smi_info->curr_msg = NULL; 657 if (msg->rsp[2] != 0) { 658 /* Error getting event, probably done. */ 659 msg->done(msg); 660 661 /* Take off the msg flag. */ 662 smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL; 663 handle_flags(smi_info); 664 } else { 665 smi_inc_stat(smi_info, incoming_messages); 666 667 /* 668 * Do this before we deliver the message 669 * because delivering the message releases the 670 * lock and something else can mess with the 671 * state. 672 */ 673 handle_flags(smi_info); 674 675 deliver_recv_msg(smi_info, msg); 676 } 677 break; 678 } 679 680 case SI_ENABLE_INTERRUPTS1: 681 { 682 unsigned char msg[4]; 683 684 /* We got the flags from the SMI, now handle them. */ 685 smi_info->handlers->get_result(smi_info->si_sm, msg, 4); 686 if (msg[2] != 0) { 687 dev_warn(smi_info->dev, "Could not enable interrupts" 688 ", failed get, using polled mode.\n"); 689 smi_info->si_state = SI_NORMAL; 690 } else { 691 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 692 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; 693 msg[2] = (msg[3] | 694 IPMI_BMC_RCV_MSG_INTR | 695 IPMI_BMC_EVT_MSG_INTR); 696 smi_info->handlers->start_transaction( 697 smi_info->si_sm, msg, 3); 698 smi_info->si_state = SI_ENABLE_INTERRUPTS2; 699 } 700 break; 701 } 702 703 case SI_ENABLE_INTERRUPTS2: 704 { 705 unsigned char msg[4]; 706 707 /* We got the flags from the SMI, now handle them. */ 708 smi_info->handlers->get_result(smi_info->si_sm, msg, 4); 709 if (msg[2] != 0) 710 dev_warn(smi_info->dev, "Could not enable interrupts" 711 ", failed set, using polled mode.\n"); 712 else 713 smi_info->interrupt_disabled = 0; 714 smi_info->si_state = SI_NORMAL; 715 break; 716 } 717 718 case SI_DISABLE_INTERRUPTS1: 719 { 720 unsigned char msg[4]; 721 722 /* We got the flags from the SMI, now handle them. */ 723 smi_info->handlers->get_result(smi_info->si_sm, msg, 4); 724 if (msg[2] != 0) { 725 dev_warn(smi_info->dev, "Could not disable interrupts" 726 ", failed get.\n"); 727 smi_info->si_state = SI_NORMAL; 728 } else { 729 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 730 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; 731 msg[2] = (msg[3] & 732 ~(IPMI_BMC_RCV_MSG_INTR | 733 IPMI_BMC_EVT_MSG_INTR)); 734 smi_info->handlers->start_transaction( 735 smi_info->si_sm, msg, 3); 736 smi_info->si_state = SI_DISABLE_INTERRUPTS2; 737 } 738 break; 739 } 740 741 case SI_DISABLE_INTERRUPTS2: 742 { 743 unsigned char msg[4]; 744 745 /* We got the flags from the SMI, now handle them. */ 746 smi_info->handlers->get_result(smi_info->si_sm, msg, 4); 747 if (msg[2] != 0) { 748 dev_warn(smi_info->dev, "Could not disable interrupts" 749 ", failed set.\n"); 750 } 751 smi_info->si_state = SI_NORMAL; 752 break; 753 } 754 } 755 } 756 757 /* 758 * Called on timeouts and events. Timeouts should pass the elapsed 759 * time, interrupts should pass in zero. Must be called with 760 * si_lock held and interrupts disabled. 761 */ 762 static enum si_sm_result smi_event_handler(struct smi_info *smi_info, 763 int time) 764 { 765 enum si_sm_result si_sm_result; 766 767 restart: 768 /* 769 * There used to be a loop here that waited a little while 770 * (around 25us) before giving up. That turned out to be 771 * pointless, the minimum delays I was seeing were in the 300us 772 * range, which is far too long to wait in an interrupt. So 773 * we just run until the state machine tells us something 774 * happened or it needs a delay. 775 */ 776 si_sm_result = smi_info->handlers->event(smi_info->si_sm, time); 777 time = 0; 778 while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY) 779 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); 780 781 if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) { 782 smi_inc_stat(smi_info, complete_transactions); 783 784 handle_transaction_done(smi_info); 785 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); 786 } else if (si_sm_result == SI_SM_HOSED) { 787 smi_inc_stat(smi_info, hosed_count); 788 789 /* 790 * Do the before return_hosed_msg, because that 791 * releases the lock. 792 */ 793 smi_info->si_state = SI_NORMAL; 794 if (smi_info->curr_msg != NULL) { 795 /* 796 * If we were handling a user message, format 797 * a response to send to the upper layer to 798 * tell it about the error. 799 */ 800 return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED); 801 } 802 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); 803 } 804 805 /* 806 * We prefer handling attn over new messages. But don't do 807 * this if there is not yet an upper layer to handle anything. 808 */ 809 if (likely(smi_info->intf) && si_sm_result == SI_SM_ATTN) { 810 unsigned char msg[2]; 811 812 smi_inc_stat(smi_info, attentions); 813 814 /* 815 * Got a attn, send down a get message flags to see 816 * what's causing it. It would be better to handle 817 * this in the upper layer, but due to the way 818 * interrupts work with the SMI, that's not really 819 * possible. 820 */ 821 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 822 msg[1] = IPMI_GET_MSG_FLAGS_CMD; 823 824 smi_info->handlers->start_transaction( 825 smi_info->si_sm, msg, 2); 826 smi_info->si_state = SI_GETTING_FLAGS; 827 goto restart; 828 } 829 830 /* If we are currently idle, try to start the next message. */ 831 if (si_sm_result == SI_SM_IDLE) { 832 smi_inc_stat(smi_info, idles); 833 834 si_sm_result = start_next_msg(smi_info); 835 if (si_sm_result != SI_SM_IDLE) 836 goto restart; 837 } 838 839 if ((si_sm_result == SI_SM_IDLE) 840 && (atomic_read(&smi_info->req_events))) { 841 /* 842 * We are idle and the upper layer requested that I fetch 843 * events, so do so. 844 */ 845 atomic_set(&smi_info->req_events, 0); 846 847 smi_info->curr_msg = ipmi_alloc_smi_msg(); 848 if (!smi_info->curr_msg) 849 goto out; 850 851 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); 852 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; 853 smi_info->curr_msg->data_size = 2; 854 855 smi_info->handlers->start_transaction( 856 smi_info->si_sm, 857 smi_info->curr_msg->data, 858 smi_info->curr_msg->data_size); 859 smi_info->si_state = SI_GETTING_EVENTS; 860 goto restart; 861 } 862 out: 863 return si_sm_result; 864 } 865 866 static void sender(void *send_info, 867 struct ipmi_smi_msg *msg, 868 int priority) 869 { 870 struct smi_info *smi_info = send_info; 871 enum si_sm_result result; 872 unsigned long flags; 873 #ifdef DEBUG_TIMING 874 struct timeval t; 875 #endif 876 877 if (atomic_read(&smi_info->stop_operation)) { 878 msg->rsp[0] = msg->data[0] | 4; 879 msg->rsp[1] = msg->data[1]; 880 msg->rsp[2] = IPMI_ERR_UNSPECIFIED; 881 msg->rsp_size = 3; 882 deliver_recv_msg(smi_info, msg); 883 return; 884 } 885 886 #ifdef DEBUG_TIMING 887 do_gettimeofday(&t); 888 printk("**Enqueue: %d.%9.9d\n", t.tv_sec, t.tv_usec); 889 #endif 890 891 /* 892 * last_timeout_jiffies is updated here to avoid 893 * smi_timeout() handler passing very large time_diff 894 * value to smi_event_handler() that causes 895 * the send command to abort. 896 */ 897 smi_info->last_timeout_jiffies = jiffies; 898 899 mod_timer(&smi_info->si_timer, jiffies + SI_TIMEOUT_JIFFIES); 900 901 if (smi_info->thread) 902 wake_up_process(smi_info->thread); 903 904 if (smi_info->run_to_completion) { 905 /* 906 * If we are running to completion, then throw it in 907 * the list and run transactions until everything is 908 * clear. Priority doesn't matter here. 909 */ 910 911 /* 912 * Run to completion means we are single-threaded, no 913 * need for locks. 914 */ 915 list_add_tail(&(msg->link), &(smi_info->xmit_msgs)); 916 917 result = smi_event_handler(smi_info, 0); 918 while (result != SI_SM_IDLE) { 919 udelay(SI_SHORT_TIMEOUT_USEC); 920 result = smi_event_handler(smi_info, 921 SI_SHORT_TIMEOUT_USEC); 922 } 923 return; 924 } 925 926 spin_lock_irqsave(&smi_info->msg_lock, flags); 927 if (priority > 0) 928 list_add_tail(&msg->link, &smi_info->hp_xmit_msgs); 929 else 930 list_add_tail(&msg->link, &smi_info->xmit_msgs); 931 spin_unlock_irqrestore(&smi_info->msg_lock, flags); 932 933 spin_lock_irqsave(&smi_info->si_lock, flags); 934 if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) 935 start_next_msg(smi_info); 936 spin_unlock_irqrestore(&smi_info->si_lock, flags); 937 } 938 939 static void set_run_to_completion(void *send_info, int i_run_to_completion) 940 { 941 struct smi_info *smi_info = send_info; 942 enum si_sm_result result; 943 944 smi_info->run_to_completion = i_run_to_completion; 945 if (i_run_to_completion) { 946 result = smi_event_handler(smi_info, 0); 947 while (result != SI_SM_IDLE) { 948 udelay(SI_SHORT_TIMEOUT_USEC); 949 result = smi_event_handler(smi_info, 950 SI_SHORT_TIMEOUT_USEC); 951 } 952 } 953 } 954 955 /* 956 * Use -1 in the nsec value of the busy waiting timespec to tell that 957 * we are spinning in kipmid looking for something and not delaying 958 * between checks 959 */ 960 static inline void ipmi_si_set_not_busy(struct timespec *ts) 961 { 962 ts->tv_nsec = -1; 963 } 964 static inline int ipmi_si_is_busy(struct timespec *ts) 965 { 966 return ts->tv_nsec != -1; 967 } 968 969 static int ipmi_thread_busy_wait(enum si_sm_result smi_result, 970 const struct smi_info *smi_info, 971 struct timespec *busy_until) 972 { 973 unsigned int max_busy_us = 0; 974 975 if (smi_info->intf_num < num_max_busy_us) 976 max_busy_us = kipmid_max_busy_us[smi_info->intf_num]; 977 if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY) 978 ipmi_si_set_not_busy(busy_until); 979 else if (!ipmi_si_is_busy(busy_until)) { 980 getnstimeofday(busy_until); 981 timespec_add_ns(busy_until, max_busy_us*NSEC_PER_USEC); 982 } else { 983 struct timespec now; 984 getnstimeofday(&now); 985 if (unlikely(timespec_compare(&now, busy_until) > 0)) { 986 ipmi_si_set_not_busy(busy_until); 987 return 0; 988 } 989 } 990 return 1; 991 } 992 993 994 /* 995 * A busy-waiting loop for speeding up IPMI operation. 996 * 997 * Lousy hardware makes this hard. This is only enabled for systems 998 * that are not BT and do not have interrupts. It starts spinning 999 * when an operation is complete or until max_busy tells it to stop 1000 * (if that is enabled). See the paragraph on kimid_max_busy_us in 1001 * Documentation/IPMI.txt for details. 1002 */ 1003 static int ipmi_thread(void *data) 1004 { 1005 struct smi_info *smi_info = data; 1006 unsigned long flags; 1007 enum si_sm_result smi_result; 1008 struct timespec busy_until; 1009 1010 ipmi_si_set_not_busy(&busy_until); 1011 set_user_nice(current, 19); 1012 while (!kthread_should_stop()) { 1013 int busy_wait; 1014 1015 spin_lock_irqsave(&(smi_info->si_lock), flags); 1016 smi_result = smi_event_handler(smi_info, 0); 1017 spin_unlock_irqrestore(&(smi_info->si_lock), flags); 1018 busy_wait = ipmi_thread_busy_wait(smi_result, smi_info, 1019 &busy_until); 1020 if (smi_result == SI_SM_CALL_WITHOUT_DELAY) 1021 ; /* do nothing */ 1022 else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait) 1023 schedule(); 1024 else if (smi_result == SI_SM_IDLE) 1025 schedule_timeout_interruptible(100); 1026 else 1027 schedule_timeout_interruptible(1); 1028 } 1029 return 0; 1030 } 1031 1032 1033 static void poll(void *send_info) 1034 { 1035 struct smi_info *smi_info = send_info; 1036 unsigned long flags; 1037 1038 /* 1039 * Make sure there is some delay in the poll loop so we can 1040 * drive time forward and timeout things. 1041 */ 1042 udelay(10); 1043 spin_lock_irqsave(&smi_info->si_lock, flags); 1044 smi_event_handler(smi_info, 10); 1045 spin_unlock_irqrestore(&smi_info->si_lock, flags); 1046 } 1047 1048 static void request_events(void *send_info) 1049 { 1050 struct smi_info *smi_info = send_info; 1051 1052 if (atomic_read(&smi_info->stop_operation) || 1053 !smi_info->has_event_buffer) 1054 return; 1055 1056 atomic_set(&smi_info->req_events, 1); 1057 } 1058 1059 static int initialized; 1060 1061 static void smi_timeout(unsigned long data) 1062 { 1063 struct smi_info *smi_info = (struct smi_info *) data; 1064 enum si_sm_result smi_result; 1065 unsigned long flags; 1066 unsigned long jiffies_now; 1067 long time_diff; 1068 long timeout; 1069 #ifdef DEBUG_TIMING 1070 struct timeval t; 1071 #endif 1072 1073 spin_lock_irqsave(&(smi_info->si_lock), flags); 1074 #ifdef DEBUG_TIMING 1075 do_gettimeofday(&t); 1076 printk(KERN_DEBUG "**Timer: %d.%9.9d\n", t.tv_sec, t.tv_usec); 1077 #endif 1078 jiffies_now = jiffies; 1079 time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies) 1080 * SI_USEC_PER_JIFFY); 1081 smi_result = smi_event_handler(smi_info, time_diff); 1082 1083 spin_unlock_irqrestore(&(smi_info->si_lock), flags); 1084 1085 smi_info->last_timeout_jiffies = jiffies_now; 1086 1087 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) { 1088 /* Running with interrupts, only do long timeouts. */ 1089 timeout = jiffies + SI_TIMEOUT_JIFFIES; 1090 smi_inc_stat(smi_info, long_timeouts); 1091 goto do_mod_timer; 1092 } 1093 1094 /* 1095 * If the state machine asks for a short delay, then shorten 1096 * the timer timeout. 1097 */ 1098 if (smi_result == SI_SM_CALL_WITH_DELAY) { 1099 smi_inc_stat(smi_info, short_timeouts); 1100 timeout = jiffies + 1; 1101 } else { 1102 smi_inc_stat(smi_info, long_timeouts); 1103 timeout = jiffies + SI_TIMEOUT_JIFFIES; 1104 } 1105 1106 do_mod_timer: 1107 if (smi_result != SI_SM_IDLE) 1108 mod_timer(&(smi_info->si_timer), timeout); 1109 } 1110 1111 static irqreturn_t si_irq_handler(int irq, void *data) 1112 { 1113 struct smi_info *smi_info = data; 1114 unsigned long flags; 1115 #ifdef DEBUG_TIMING 1116 struct timeval t; 1117 #endif 1118 1119 spin_lock_irqsave(&(smi_info->si_lock), flags); 1120 1121 smi_inc_stat(smi_info, interrupts); 1122 1123 #ifdef DEBUG_TIMING 1124 do_gettimeofday(&t); 1125 printk(KERN_DEBUG "**Interrupt: %d.%9.9d\n", t.tv_sec, t.tv_usec); 1126 #endif 1127 smi_event_handler(smi_info, 0); 1128 spin_unlock_irqrestore(&(smi_info->si_lock), flags); 1129 return IRQ_HANDLED; 1130 } 1131 1132 static irqreturn_t si_bt_irq_handler(int irq, void *data) 1133 { 1134 struct smi_info *smi_info = data; 1135 /* We need to clear the IRQ flag for the BT interface. */ 1136 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 1137 IPMI_BT_INTMASK_CLEAR_IRQ_BIT 1138 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); 1139 return si_irq_handler(irq, data); 1140 } 1141 1142 static int smi_start_processing(void *send_info, 1143 ipmi_smi_t intf) 1144 { 1145 struct smi_info *new_smi = send_info; 1146 int enable = 0; 1147 1148 new_smi->intf = intf; 1149 1150 /* Try to claim any interrupts. */ 1151 if (new_smi->irq_setup) 1152 new_smi->irq_setup(new_smi); 1153 1154 /* Set up the timer that drives the interface. */ 1155 setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi); 1156 new_smi->last_timeout_jiffies = jiffies; 1157 mod_timer(&new_smi->si_timer, jiffies + SI_TIMEOUT_JIFFIES); 1158 1159 /* 1160 * Check if the user forcefully enabled the daemon. 1161 */ 1162 if (new_smi->intf_num < num_force_kipmid) 1163 enable = force_kipmid[new_smi->intf_num]; 1164 /* 1165 * The BT interface is efficient enough to not need a thread, 1166 * and there is no need for a thread if we have interrupts. 1167 */ 1168 else if ((new_smi->si_type != SI_BT) && (!new_smi->irq)) 1169 enable = 1; 1170 1171 if (enable) { 1172 new_smi->thread = kthread_run(ipmi_thread, new_smi, 1173 "kipmi%d", new_smi->intf_num); 1174 if (IS_ERR(new_smi->thread)) { 1175 dev_notice(new_smi->dev, "Could not start" 1176 " kernel thread due to error %ld, only using" 1177 " timers to drive the interface\n", 1178 PTR_ERR(new_smi->thread)); 1179 new_smi->thread = NULL; 1180 } 1181 } 1182 1183 return 0; 1184 } 1185 1186 static int get_smi_info(void *send_info, struct ipmi_smi_info *data) 1187 { 1188 struct smi_info *smi = send_info; 1189 1190 data->addr_src = smi->addr_source; 1191 data->dev = smi->dev; 1192 data->addr_info = smi->addr_info; 1193 get_device(smi->dev); 1194 1195 return 0; 1196 } 1197 1198 static void set_maintenance_mode(void *send_info, int enable) 1199 { 1200 struct smi_info *smi_info = send_info; 1201 1202 if (!enable) 1203 atomic_set(&smi_info->req_events, 0); 1204 } 1205 1206 static struct ipmi_smi_handlers handlers = { 1207 .owner = THIS_MODULE, 1208 .start_processing = smi_start_processing, 1209 .get_smi_info = get_smi_info, 1210 .sender = sender, 1211 .request_events = request_events, 1212 .set_maintenance_mode = set_maintenance_mode, 1213 .set_run_to_completion = set_run_to_completion, 1214 .poll = poll, 1215 }; 1216 1217 /* 1218 * There can be 4 IO ports passed in (with or without IRQs), 4 addresses, 1219 * a default IO port, and 1 ACPI/SPMI address. That sets SI_MAX_DRIVERS. 1220 */ 1221 1222 static LIST_HEAD(smi_infos); 1223 static DEFINE_MUTEX(smi_infos_lock); 1224 static int smi_num; /* Used to sequence the SMIs */ 1225 1226 #define DEFAULT_REGSPACING 1 1227 #define DEFAULT_REGSIZE 1 1228 1229 static int si_trydefaults = 1; 1230 static char *si_type[SI_MAX_PARMS]; 1231 #define MAX_SI_TYPE_STR 30 1232 static char si_type_str[MAX_SI_TYPE_STR]; 1233 static unsigned long addrs[SI_MAX_PARMS]; 1234 static unsigned int num_addrs; 1235 static unsigned int ports[SI_MAX_PARMS]; 1236 static unsigned int num_ports; 1237 static int irqs[SI_MAX_PARMS]; 1238 static unsigned int num_irqs; 1239 static int regspacings[SI_MAX_PARMS]; 1240 static unsigned int num_regspacings; 1241 static int regsizes[SI_MAX_PARMS]; 1242 static unsigned int num_regsizes; 1243 static int regshifts[SI_MAX_PARMS]; 1244 static unsigned int num_regshifts; 1245 static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */ 1246 static unsigned int num_slave_addrs; 1247 1248 #define IPMI_IO_ADDR_SPACE 0 1249 #define IPMI_MEM_ADDR_SPACE 1 1250 static char *addr_space_to_str[] = { "i/o", "mem" }; 1251 1252 static int hotmod_handler(const char *val, struct kernel_param *kp); 1253 1254 module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200); 1255 MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See" 1256 " Documentation/IPMI.txt in the kernel sources for the" 1257 " gory details."); 1258 1259 module_param_named(trydefaults, si_trydefaults, bool, 0); 1260 MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the" 1261 " default scan of the KCS and SMIC interface at the standard" 1262 " address"); 1263 module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0); 1264 MODULE_PARM_DESC(type, "Defines the type of each interface, each" 1265 " interface separated by commas. The types are 'kcs'," 1266 " 'smic', and 'bt'. For example si_type=kcs,bt will set" 1267 " the first interface to kcs and the second to bt"); 1268 module_param_array(addrs, ulong, &num_addrs, 0); 1269 MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the" 1270 " addresses separated by commas. Only use if an interface" 1271 " is in memory. Otherwise, set it to zero or leave" 1272 " it blank."); 1273 module_param_array(ports, uint, &num_ports, 0); 1274 MODULE_PARM_DESC(ports, "Sets the port address of each interface, the" 1275 " addresses separated by commas. Only use if an interface" 1276 " is a port. Otherwise, set it to zero or leave" 1277 " it blank."); 1278 module_param_array(irqs, int, &num_irqs, 0); 1279 MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the" 1280 " addresses separated by commas. Only use if an interface" 1281 " has an interrupt. Otherwise, set it to zero or leave" 1282 " it blank."); 1283 module_param_array(regspacings, int, &num_regspacings, 0); 1284 MODULE_PARM_DESC(regspacings, "The number of bytes between the start address" 1285 " and each successive register used by the interface. For" 1286 " instance, if the start address is 0xca2 and the spacing" 1287 " is 2, then the second address is at 0xca4. Defaults" 1288 " to 1."); 1289 module_param_array(regsizes, int, &num_regsizes, 0); 1290 MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes." 1291 " This should generally be 1, 2, 4, or 8 for an 8-bit," 1292 " 16-bit, 32-bit, or 64-bit register. Use this if you" 1293 " the 8-bit IPMI register has to be read from a larger" 1294 " register."); 1295 module_param_array(regshifts, int, &num_regshifts, 0); 1296 MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the." 1297 " IPMI register, in bits. For instance, if the data" 1298 " is read from a 32-bit word and the IPMI data is in" 1299 " bit 8-15, then the shift would be 8"); 1300 module_param_array(slave_addrs, int, &num_slave_addrs, 0); 1301 MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for" 1302 " the controller. Normally this is 0x20, but can be" 1303 " overridden by this parm. This is an array indexed" 1304 " by interface number."); 1305 module_param_array(force_kipmid, int, &num_force_kipmid, 0); 1306 MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or" 1307 " disabled(0). Normally the IPMI driver auto-detects" 1308 " this, but the value may be overridden by this parm."); 1309 module_param(unload_when_empty, int, 0); 1310 MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are" 1311 " specified or found, default is 1. Setting to 0" 1312 " is useful for hot add of devices using hotmod."); 1313 module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644); 1314 MODULE_PARM_DESC(kipmid_max_busy_us, 1315 "Max time (in microseconds) to busy-wait for IPMI data before" 1316 " sleeping. 0 (default) means to wait forever. Set to 100-500" 1317 " if kipmid is using up a lot of CPU time."); 1318 1319 1320 static void std_irq_cleanup(struct smi_info *info) 1321 { 1322 if (info->si_type == SI_BT) 1323 /* Disable the interrupt in the BT interface. */ 1324 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 0); 1325 free_irq(info->irq, info); 1326 } 1327 1328 static int std_irq_setup(struct smi_info *info) 1329 { 1330 int rv; 1331 1332 if (!info->irq) 1333 return 0; 1334 1335 if (info->si_type == SI_BT) { 1336 rv = request_irq(info->irq, 1337 si_bt_irq_handler, 1338 IRQF_SHARED | IRQF_DISABLED, 1339 DEVICE_NAME, 1340 info); 1341 if (!rv) 1342 /* Enable the interrupt in the BT interface. */ 1343 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 1344 IPMI_BT_INTMASK_ENABLE_IRQ_BIT); 1345 } else 1346 rv = request_irq(info->irq, 1347 si_irq_handler, 1348 IRQF_SHARED | IRQF_DISABLED, 1349 DEVICE_NAME, 1350 info); 1351 if (rv) { 1352 dev_warn(info->dev, "%s unable to claim interrupt %d," 1353 " running polled\n", 1354 DEVICE_NAME, info->irq); 1355 info->irq = 0; 1356 } else { 1357 info->irq_cleanup = std_irq_cleanup; 1358 dev_info(info->dev, "Using irq %d\n", info->irq); 1359 } 1360 1361 return rv; 1362 } 1363 1364 static unsigned char port_inb(struct si_sm_io *io, unsigned int offset) 1365 { 1366 unsigned int addr = io->addr_data; 1367 1368 return inb(addr + (offset * io->regspacing)); 1369 } 1370 1371 static void port_outb(struct si_sm_io *io, unsigned int offset, 1372 unsigned char b) 1373 { 1374 unsigned int addr = io->addr_data; 1375 1376 outb(b, addr + (offset * io->regspacing)); 1377 } 1378 1379 static unsigned char port_inw(struct si_sm_io *io, unsigned int offset) 1380 { 1381 unsigned int addr = io->addr_data; 1382 1383 return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff; 1384 } 1385 1386 static void port_outw(struct si_sm_io *io, unsigned int offset, 1387 unsigned char b) 1388 { 1389 unsigned int addr = io->addr_data; 1390 1391 outw(b << io->regshift, addr + (offset * io->regspacing)); 1392 } 1393 1394 static unsigned char port_inl(struct si_sm_io *io, unsigned int offset) 1395 { 1396 unsigned int addr = io->addr_data; 1397 1398 return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff; 1399 } 1400 1401 static void port_outl(struct si_sm_io *io, unsigned int offset, 1402 unsigned char b) 1403 { 1404 unsigned int addr = io->addr_data; 1405 1406 outl(b << io->regshift, addr+(offset * io->regspacing)); 1407 } 1408 1409 static void port_cleanup(struct smi_info *info) 1410 { 1411 unsigned int addr = info->io.addr_data; 1412 int idx; 1413 1414 if (addr) { 1415 for (idx = 0; idx < info->io_size; idx++) 1416 release_region(addr + idx * info->io.regspacing, 1417 info->io.regsize); 1418 } 1419 } 1420 1421 static int port_setup(struct smi_info *info) 1422 { 1423 unsigned int addr = info->io.addr_data; 1424 int idx; 1425 1426 if (!addr) 1427 return -ENODEV; 1428 1429 info->io_cleanup = port_cleanup; 1430 1431 /* 1432 * Figure out the actual inb/inw/inl/etc routine to use based 1433 * upon the register size. 1434 */ 1435 switch (info->io.regsize) { 1436 case 1: 1437 info->io.inputb = port_inb; 1438 info->io.outputb = port_outb; 1439 break; 1440 case 2: 1441 info->io.inputb = port_inw; 1442 info->io.outputb = port_outw; 1443 break; 1444 case 4: 1445 info->io.inputb = port_inl; 1446 info->io.outputb = port_outl; 1447 break; 1448 default: 1449 dev_warn(info->dev, "Invalid register size: %d\n", 1450 info->io.regsize); 1451 return -EINVAL; 1452 } 1453 1454 /* 1455 * Some BIOSes reserve disjoint I/O regions in their ACPI 1456 * tables. This causes problems when trying to register the 1457 * entire I/O region. Therefore we must register each I/O 1458 * port separately. 1459 */ 1460 for (idx = 0; idx < info->io_size; idx++) { 1461 if (request_region(addr + idx * info->io.regspacing, 1462 info->io.regsize, DEVICE_NAME) == NULL) { 1463 /* Undo allocations */ 1464 while (idx--) { 1465 release_region(addr + idx * info->io.regspacing, 1466 info->io.regsize); 1467 } 1468 return -EIO; 1469 } 1470 } 1471 return 0; 1472 } 1473 1474 static unsigned char intf_mem_inb(struct si_sm_io *io, unsigned int offset) 1475 { 1476 return readb((io->addr)+(offset * io->regspacing)); 1477 } 1478 1479 static void intf_mem_outb(struct si_sm_io *io, unsigned int offset, 1480 unsigned char b) 1481 { 1482 writeb(b, (io->addr)+(offset * io->regspacing)); 1483 } 1484 1485 static unsigned char intf_mem_inw(struct si_sm_io *io, unsigned int offset) 1486 { 1487 return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift) 1488 & 0xff; 1489 } 1490 1491 static void intf_mem_outw(struct si_sm_io *io, unsigned int offset, 1492 unsigned char b) 1493 { 1494 writeb(b << io->regshift, (io->addr)+(offset * io->regspacing)); 1495 } 1496 1497 static unsigned char intf_mem_inl(struct si_sm_io *io, unsigned int offset) 1498 { 1499 return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift) 1500 & 0xff; 1501 } 1502 1503 static void intf_mem_outl(struct si_sm_io *io, unsigned int offset, 1504 unsigned char b) 1505 { 1506 writel(b << io->regshift, (io->addr)+(offset * io->regspacing)); 1507 } 1508 1509 #ifdef readq 1510 static unsigned char mem_inq(struct si_sm_io *io, unsigned int offset) 1511 { 1512 return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift) 1513 & 0xff; 1514 } 1515 1516 static void mem_outq(struct si_sm_io *io, unsigned int offset, 1517 unsigned char b) 1518 { 1519 writeq(b << io->regshift, (io->addr)+(offset * io->regspacing)); 1520 } 1521 #endif 1522 1523 static void mem_cleanup(struct smi_info *info) 1524 { 1525 unsigned long addr = info->io.addr_data; 1526 int mapsize; 1527 1528 if (info->io.addr) { 1529 iounmap(info->io.addr); 1530 1531 mapsize = ((info->io_size * info->io.regspacing) 1532 - (info->io.regspacing - info->io.regsize)); 1533 1534 release_mem_region(addr, mapsize); 1535 } 1536 } 1537 1538 static int mem_setup(struct smi_info *info) 1539 { 1540 unsigned long addr = info->io.addr_data; 1541 int mapsize; 1542 1543 if (!addr) 1544 return -ENODEV; 1545 1546 info->io_cleanup = mem_cleanup; 1547 1548 /* 1549 * Figure out the actual readb/readw/readl/etc routine to use based 1550 * upon the register size. 1551 */ 1552 switch (info->io.regsize) { 1553 case 1: 1554 info->io.inputb = intf_mem_inb; 1555 info->io.outputb = intf_mem_outb; 1556 break; 1557 case 2: 1558 info->io.inputb = intf_mem_inw; 1559 info->io.outputb = intf_mem_outw; 1560 break; 1561 case 4: 1562 info->io.inputb = intf_mem_inl; 1563 info->io.outputb = intf_mem_outl; 1564 break; 1565 #ifdef readq 1566 case 8: 1567 info->io.inputb = mem_inq; 1568 info->io.outputb = mem_outq; 1569 break; 1570 #endif 1571 default: 1572 dev_warn(info->dev, "Invalid register size: %d\n", 1573 info->io.regsize); 1574 return -EINVAL; 1575 } 1576 1577 /* 1578 * Calculate the total amount of memory to claim. This is an 1579 * unusual looking calculation, but it avoids claiming any 1580 * more memory than it has to. It will claim everything 1581 * between the first address to the end of the last full 1582 * register. 1583 */ 1584 mapsize = ((info->io_size * info->io.regspacing) 1585 - (info->io.regspacing - info->io.regsize)); 1586 1587 if (request_mem_region(addr, mapsize, DEVICE_NAME) == NULL) 1588 return -EIO; 1589 1590 info->io.addr = ioremap(addr, mapsize); 1591 if (info->io.addr == NULL) { 1592 release_mem_region(addr, mapsize); 1593 return -EIO; 1594 } 1595 return 0; 1596 } 1597 1598 /* 1599 * Parms come in as <op1>[:op2[:op3...]]. ops are: 1600 * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]] 1601 * Options are: 1602 * rsp=<regspacing> 1603 * rsi=<regsize> 1604 * rsh=<regshift> 1605 * irq=<irq> 1606 * ipmb=<ipmb addr> 1607 */ 1608 enum hotmod_op { HM_ADD, HM_REMOVE }; 1609 struct hotmod_vals { 1610 char *name; 1611 int val; 1612 }; 1613 static struct hotmod_vals hotmod_ops[] = { 1614 { "add", HM_ADD }, 1615 { "remove", HM_REMOVE }, 1616 { NULL } 1617 }; 1618 static struct hotmod_vals hotmod_si[] = { 1619 { "kcs", SI_KCS }, 1620 { "smic", SI_SMIC }, 1621 { "bt", SI_BT }, 1622 { NULL } 1623 }; 1624 static struct hotmod_vals hotmod_as[] = { 1625 { "mem", IPMI_MEM_ADDR_SPACE }, 1626 { "i/o", IPMI_IO_ADDR_SPACE }, 1627 { NULL } 1628 }; 1629 1630 static int parse_str(struct hotmod_vals *v, int *val, char *name, char **curr) 1631 { 1632 char *s; 1633 int i; 1634 1635 s = strchr(*curr, ','); 1636 if (!s) { 1637 printk(KERN_WARNING PFX "No hotmod %s given.\n", name); 1638 return -EINVAL; 1639 } 1640 *s = '\0'; 1641 s++; 1642 for (i = 0; hotmod_ops[i].name; i++) { 1643 if (strcmp(*curr, v[i].name) == 0) { 1644 *val = v[i].val; 1645 *curr = s; 1646 return 0; 1647 } 1648 } 1649 1650 printk(KERN_WARNING PFX "Invalid hotmod %s '%s'\n", name, *curr); 1651 return -EINVAL; 1652 } 1653 1654 static int check_hotmod_int_op(const char *curr, const char *option, 1655 const char *name, int *val) 1656 { 1657 char *n; 1658 1659 if (strcmp(curr, name) == 0) { 1660 if (!option) { 1661 printk(KERN_WARNING PFX 1662 "No option given for '%s'\n", 1663 curr); 1664 return -EINVAL; 1665 } 1666 *val = simple_strtoul(option, &n, 0); 1667 if ((*n != '\0') || (*option == '\0')) { 1668 printk(KERN_WARNING PFX 1669 "Bad option given for '%s'\n", 1670 curr); 1671 return -EINVAL; 1672 } 1673 return 1; 1674 } 1675 return 0; 1676 } 1677 1678 static struct smi_info *smi_info_alloc(void) 1679 { 1680 struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL); 1681 1682 if (info) { 1683 spin_lock_init(&info->si_lock); 1684 spin_lock_init(&info->msg_lock); 1685 } 1686 return info; 1687 } 1688 1689 static int hotmod_handler(const char *val, struct kernel_param *kp) 1690 { 1691 char *str = kstrdup(val, GFP_KERNEL); 1692 int rv; 1693 char *next, *curr, *s, *n, *o; 1694 enum hotmod_op op; 1695 enum si_type si_type; 1696 int addr_space; 1697 unsigned long addr; 1698 int regspacing; 1699 int regsize; 1700 int regshift; 1701 int irq; 1702 int ipmb; 1703 int ival; 1704 int len; 1705 struct smi_info *info; 1706 1707 if (!str) 1708 return -ENOMEM; 1709 1710 /* Kill any trailing spaces, as we can get a "\n" from echo. */ 1711 len = strlen(str); 1712 ival = len - 1; 1713 while ((ival >= 0) && isspace(str[ival])) { 1714 str[ival] = '\0'; 1715 ival--; 1716 } 1717 1718 for (curr = str; curr; curr = next) { 1719 regspacing = 1; 1720 regsize = 1; 1721 regshift = 0; 1722 irq = 0; 1723 ipmb = 0; /* Choose the default if not specified */ 1724 1725 next = strchr(curr, ':'); 1726 if (next) { 1727 *next = '\0'; 1728 next++; 1729 } 1730 1731 rv = parse_str(hotmod_ops, &ival, "operation", &curr); 1732 if (rv) 1733 break; 1734 op = ival; 1735 1736 rv = parse_str(hotmod_si, &ival, "interface type", &curr); 1737 if (rv) 1738 break; 1739 si_type = ival; 1740 1741 rv = parse_str(hotmod_as, &addr_space, "address space", &curr); 1742 if (rv) 1743 break; 1744 1745 s = strchr(curr, ','); 1746 if (s) { 1747 *s = '\0'; 1748 s++; 1749 } 1750 addr = simple_strtoul(curr, &n, 0); 1751 if ((*n != '\0') || (*curr == '\0')) { 1752 printk(KERN_WARNING PFX "Invalid hotmod address" 1753 " '%s'\n", curr); 1754 break; 1755 } 1756 1757 while (s) { 1758 curr = s; 1759 s = strchr(curr, ','); 1760 if (s) { 1761 *s = '\0'; 1762 s++; 1763 } 1764 o = strchr(curr, '='); 1765 if (o) { 1766 *o = '\0'; 1767 o++; 1768 } 1769 rv = check_hotmod_int_op(curr, o, "rsp", ®spacing); 1770 if (rv < 0) 1771 goto out; 1772 else if (rv) 1773 continue; 1774 rv = check_hotmod_int_op(curr, o, "rsi", ®size); 1775 if (rv < 0) 1776 goto out; 1777 else if (rv) 1778 continue; 1779 rv = check_hotmod_int_op(curr, o, "rsh", ®shift); 1780 if (rv < 0) 1781 goto out; 1782 else if (rv) 1783 continue; 1784 rv = check_hotmod_int_op(curr, o, "irq", &irq); 1785 if (rv < 0) 1786 goto out; 1787 else if (rv) 1788 continue; 1789 rv = check_hotmod_int_op(curr, o, "ipmb", &ipmb); 1790 if (rv < 0) 1791 goto out; 1792 else if (rv) 1793 continue; 1794 1795 rv = -EINVAL; 1796 printk(KERN_WARNING PFX 1797 "Invalid hotmod option '%s'\n", 1798 curr); 1799 goto out; 1800 } 1801 1802 if (op == HM_ADD) { 1803 info = smi_info_alloc(); 1804 if (!info) { 1805 rv = -ENOMEM; 1806 goto out; 1807 } 1808 1809 info->addr_source = SI_HOTMOD; 1810 info->si_type = si_type; 1811 info->io.addr_data = addr; 1812 info->io.addr_type = addr_space; 1813 if (addr_space == IPMI_MEM_ADDR_SPACE) 1814 info->io_setup = mem_setup; 1815 else 1816 info->io_setup = port_setup; 1817 1818 info->io.addr = NULL; 1819 info->io.regspacing = regspacing; 1820 if (!info->io.regspacing) 1821 info->io.regspacing = DEFAULT_REGSPACING; 1822 info->io.regsize = regsize; 1823 if (!info->io.regsize) 1824 info->io.regsize = DEFAULT_REGSPACING; 1825 info->io.regshift = regshift; 1826 info->irq = irq; 1827 if (info->irq) 1828 info->irq_setup = std_irq_setup; 1829 info->slave_addr = ipmb; 1830 1831 if (!add_smi(info)) { 1832 if (try_smi_init(info)) 1833 cleanup_one_si(info); 1834 } else { 1835 kfree(info); 1836 } 1837 } else { 1838 /* remove */ 1839 struct smi_info *e, *tmp_e; 1840 1841 mutex_lock(&smi_infos_lock); 1842 list_for_each_entry_safe(e, tmp_e, &smi_infos, link) { 1843 if (e->io.addr_type != addr_space) 1844 continue; 1845 if (e->si_type != si_type) 1846 continue; 1847 if (e->io.addr_data == addr) 1848 cleanup_one_si(e); 1849 } 1850 mutex_unlock(&smi_infos_lock); 1851 } 1852 } 1853 rv = len; 1854 out: 1855 kfree(str); 1856 return rv; 1857 } 1858 1859 static int __devinit hardcode_find_bmc(void) 1860 { 1861 int ret = -ENODEV; 1862 int i; 1863 struct smi_info *info; 1864 1865 for (i = 0; i < SI_MAX_PARMS; i++) { 1866 if (!ports[i] && !addrs[i]) 1867 continue; 1868 1869 info = smi_info_alloc(); 1870 if (!info) 1871 return -ENOMEM; 1872 1873 info->addr_source = SI_HARDCODED; 1874 printk(KERN_INFO PFX "probing via hardcoded address\n"); 1875 1876 if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) { 1877 info->si_type = SI_KCS; 1878 } else if (strcmp(si_type[i], "smic") == 0) { 1879 info->si_type = SI_SMIC; 1880 } else if (strcmp(si_type[i], "bt") == 0) { 1881 info->si_type = SI_BT; 1882 } else { 1883 printk(KERN_WARNING PFX "Interface type specified " 1884 "for interface %d, was invalid: %s\n", 1885 i, si_type[i]); 1886 kfree(info); 1887 continue; 1888 } 1889 1890 if (ports[i]) { 1891 /* An I/O port */ 1892 info->io_setup = port_setup; 1893 info->io.addr_data = ports[i]; 1894 info->io.addr_type = IPMI_IO_ADDR_SPACE; 1895 } else if (addrs[i]) { 1896 /* A memory port */ 1897 info->io_setup = mem_setup; 1898 info->io.addr_data = addrs[i]; 1899 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 1900 } else { 1901 printk(KERN_WARNING PFX "Interface type specified " 1902 "for interface %d, but port and address were " 1903 "not set or set to zero.\n", i); 1904 kfree(info); 1905 continue; 1906 } 1907 1908 info->io.addr = NULL; 1909 info->io.regspacing = regspacings[i]; 1910 if (!info->io.regspacing) 1911 info->io.regspacing = DEFAULT_REGSPACING; 1912 info->io.regsize = regsizes[i]; 1913 if (!info->io.regsize) 1914 info->io.regsize = DEFAULT_REGSPACING; 1915 info->io.regshift = regshifts[i]; 1916 info->irq = irqs[i]; 1917 if (info->irq) 1918 info->irq_setup = std_irq_setup; 1919 info->slave_addr = slave_addrs[i]; 1920 1921 if (!add_smi(info)) { 1922 if (try_smi_init(info)) 1923 cleanup_one_si(info); 1924 ret = 0; 1925 } else { 1926 kfree(info); 1927 } 1928 } 1929 return ret; 1930 } 1931 1932 #ifdef CONFIG_ACPI 1933 1934 #include <linux/acpi.h> 1935 1936 /* 1937 * Once we get an ACPI failure, we don't try any more, because we go 1938 * through the tables sequentially. Once we don't find a table, there 1939 * are no more. 1940 */ 1941 static int acpi_failure; 1942 1943 /* For GPE-type interrupts. */ 1944 static u32 ipmi_acpi_gpe(acpi_handle gpe_device, 1945 u32 gpe_number, void *context) 1946 { 1947 struct smi_info *smi_info = context; 1948 unsigned long flags; 1949 #ifdef DEBUG_TIMING 1950 struct timeval t; 1951 #endif 1952 1953 spin_lock_irqsave(&(smi_info->si_lock), flags); 1954 1955 smi_inc_stat(smi_info, interrupts); 1956 1957 #ifdef DEBUG_TIMING 1958 do_gettimeofday(&t); 1959 printk("**ACPI_GPE: %d.%9.9d\n", t.tv_sec, t.tv_usec); 1960 #endif 1961 smi_event_handler(smi_info, 0); 1962 spin_unlock_irqrestore(&(smi_info->si_lock), flags); 1963 1964 return ACPI_INTERRUPT_HANDLED; 1965 } 1966 1967 static void acpi_gpe_irq_cleanup(struct smi_info *info) 1968 { 1969 if (!info->irq) 1970 return; 1971 1972 acpi_remove_gpe_handler(NULL, info->irq, &ipmi_acpi_gpe); 1973 } 1974 1975 static int acpi_gpe_irq_setup(struct smi_info *info) 1976 { 1977 acpi_status status; 1978 1979 if (!info->irq) 1980 return 0; 1981 1982 /* FIXME - is level triggered right? */ 1983 status = acpi_install_gpe_handler(NULL, 1984 info->irq, 1985 ACPI_GPE_LEVEL_TRIGGERED, 1986 &ipmi_acpi_gpe, 1987 info); 1988 if (status != AE_OK) { 1989 dev_warn(info->dev, "%s unable to claim ACPI GPE %d," 1990 " running polled\n", DEVICE_NAME, info->irq); 1991 info->irq = 0; 1992 return -EINVAL; 1993 } else { 1994 info->irq_cleanup = acpi_gpe_irq_cleanup; 1995 dev_info(info->dev, "Using ACPI GPE %d\n", info->irq); 1996 return 0; 1997 } 1998 } 1999 2000 /* 2001 * Defined at 2002 * http://h21007.www2.hp.com/portal/download/files/unprot/hpspmi.pdf 2003 */ 2004 struct SPMITable { 2005 s8 Signature[4]; 2006 u32 Length; 2007 u8 Revision; 2008 u8 Checksum; 2009 s8 OEMID[6]; 2010 s8 OEMTableID[8]; 2011 s8 OEMRevision[4]; 2012 s8 CreatorID[4]; 2013 s8 CreatorRevision[4]; 2014 u8 InterfaceType; 2015 u8 IPMIlegacy; 2016 s16 SpecificationRevision; 2017 2018 /* 2019 * Bit 0 - SCI interrupt supported 2020 * Bit 1 - I/O APIC/SAPIC 2021 */ 2022 u8 InterruptType; 2023 2024 /* 2025 * If bit 0 of InterruptType is set, then this is the SCI 2026 * interrupt in the GPEx_STS register. 2027 */ 2028 u8 GPE; 2029 2030 s16 Reserved; 2031 2032 /* 2033 * If bit 1 of InterruptType is set, then this is the I/O 2034 * APIC/SAPIC interrupt. 2035 */ 2036 u32 GlobalSystemInterrupt; 2037 2038 /* The actual register address. */ 2039 struct acpi_generic_address addr; 2040 2041 u8 UID[4]; 2042 2043 s8 spmi_id[1]; /* A '\0' terminated array starts here. */ 2044 }; 2045 2046 static int __devinit try_init_spmi(struct SPMITable *spmi) 2047 { 2048 struct smi_info *info; 2049 2050 if (spmi->IPMIlegacy != 1) { 2051 printk(KERN_INFO PFX "Bad SPMI legacy %d\n", spmi->IPMIlegacy); 2052 return -ENODEV; 2053 } 2054 2055 info = smi_info_alloc(); 2056 if (!info) { 2057 printk(KERN_ERR PFX "Could not allocate SI data (3)\n"); 2058 return -ENOMEM; 2059 } 2060 2061 info->addr_source = SI_SPMI; 2062 printk(KERN_INFO PFX "probing via SPMI\n"); 2063 2064 /* Figure out the interface type. */ 2065 switch (spmi->InterfaceType) { 2066 case 1: /* KCS */ 2067 info->si_type = SI_KCS; 2068 break; 2069 case 2: /* SMIC */ 2070 info->si_type = SI_SMIC; 2071 break; 2072 case 3: /* BT */ 2073 info->si_type = SI_BT; 2074 break; 2075 default: 2076 printk(KERN_INFO PFX "Unknown ACPI/SPMI SI type %d\n", 2077 spmi->InterfaceType); 2078 kfree(info); 2079 return -EIO; 2080 } 2081 2082 if (spmi->InterruptType & 1) { 2083 /* We've got a GPE interrupt. */ 2084 info->irq = spmi->GPE; 2085 info->irq_setup = acpi_gpe_irq_setup; 2086 } else if (spmi->InterruptType & 2) { 2087 /* We've got an APIC/SAPIC interrupt. */ 2088 info->irq = spmi->GlobalSystemInterrupt; 2089 info->irq_setup = std_irq_setup; 2090 } else { 2091 /* Use the default interrupt setting. */ 2092 info->irq = 0; 2093 info->irq_setup = NULL; 2094 } 2095 2096 if (spmi->addr.bit_width) { 2097 /* A (hopefully) properly formed register bit width. */ 2098 info->io.regspacing = spmi->addr.bit_width / 8; 2099 } else { 2100 info->io.regspacing = DEFAULT_REGSPACING; 2101 } 2102 info->io.regsize = info->io.regspacing; 2103 info->io.regshift = spmi->addr.bit_offset; 2104 2105 if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { 2106 info->io_setup = mem_setup; 2107 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2108 } else if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_IO) { 2109 info->io_setup = port_setup; 2110 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2111 } else { 2112 kfree(info); 2113 printk(KERN_WARNING PFX "Unknown ACPI I/O Address type\n"); 2114 return -EIO; 2115 } 2116 info->io.addr_data = spmi->addr.address; 2117 2118 pr_info("ipmi_si: SPMI: %s %#lx regsize %d spacing %d irq %d\n", 2119 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem", 2120 info->io.addr_data, info->io.regsize, info->io.regspacing, 2121 info->irq); 2122 2123 if (add_smi(info)) 2124 kfree(info); 2125 2126 return 0; 2127 } 2128 2129 static void __devinit spmi_find_bmc(void) 2130 { 2131 acpi_status status; 2132 struct SPMITable *spmi; 2133 int i; 2134 2135 if (acpi_disabled) 2136 return; 2137 2138 if (acpi_failure) 2139 return; 2140 2141 for (i = 0; ; i++) { 2142 status = acpi_get_table(ACPI_SIG_SPMI, i+1, 2143 (struct acpi_table_header **)&spmi); 2144 if (status != AE_OK) 2145 return; 2146 2147 try_init_spmi(spmi); 2148 } 2149 } 2150 2151 static int __devinit ipmi_pnp_probe(struct pnp_dev *dev, 2152 const struct pnp_device_id *dev_id) 2153 { 2154 struct acpi_device *acpi_dev; 2155 struct smi_info *info; 2156 struct resource *res, *res_second; 2157 acpi_handle handle; 2158 acpi_status status; 2159 unsigned long long tmp; 2160 2161 acpi_dev = pnp_acpi_device(dev); 2162 if (!acpi_dev) 2163 return -ENODEV; 2164 2165 info = smi_info_alloc(); 2166 if (!info) 2167 return -ENOMEM; 2168 2169 info->addr_source = SI_ACPI; 2170 printk(KERN_INFO PFX "probing via ACPI\n"); 2171 2172 handle = acpi_dev->handle; 2173 info->addr_info.acpi_info.acpi_handle = handle; 2174 2175 /* _IFT tells us the interface type: KCS, BT, etc */ 2176 status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp); 2177 if (ACPI_FAILURE(status)) 2178 goto err_free; 2179 2180 switch (tmp) { 2181 case 1: 2182 info->si_type = SI_KCS; 2183 break; 2184 case 2: 2185 info->si_type = SI_SMIC; 2186 break; 2187 case 3: 2188 info->si_type = SI_BT; 2189 break; 2190 default: 2191 dev_info(&dev->dev, "unknown IPMI type %lld\n", tmp); 2192 goto err_free; 2193 } 2194 2195 res = pnp_get_resource(dev, IORESOURCE_IO, 0); 2196 if (res) { 2197 info->io_setup = port_setup; 2198 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2199 } else { 2200 res = pnp_get_resource(dev, IORESOURCE_MEM, 0); 2201 if (res) { 2202 info->io_setup = mem_setup; 2203 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2204 } 2205 } 2206 if (!res) { 2207 dev_err(&dev->dev, "no I/O or memory address\n"); 2208 goto err_free; 2209 } 2210 info->io.addr_data = res->start; 2211 2212 info->io.regspacing = DEFAULT_REGSPACING; 2213 res_second = pnp_get_resource(dev, 2214 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? 2215 IORESOURCE_IO : IORESOURCE_MEM, 2216 1); 2217 if (res_second) { 2218 if (res_second->start > info->io.addr_data) 2219 info->io.regspacing = res_second->start - info->io.addr_data; 2220 } 2221 info->io.regsize = DEFAULT_REGSPACING; 2222 info->io.regshift = 0; 2223 2224 /* If _GPE exists, use it; otherwise use standard interrupts */ 2225 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); 2226 if (ACPI_SUCCESS(status)) { 2227 info->irq = tmp; 2228 info->irq_setup = acpi_gpe_irq_setup; 2229 } else if (pnp_irq_valid(dev, 0)) { 2230 info->irq = pnp_irq(dev, 0); 2231 info->irq_setup = std_irq_setup; 2232 } 2233 2234 info->dev = &dev->dev; 2235 pnp_set_drvdata(dev, info); 2236 2237 dev_info(info->dev, "%pR regsize %d spacing %d irq %d\n", 2238 res, info->io.regsize, info->io.regspacing, 2239 info->irq); 2240 2241 if (add_smi(info)) 2242 goto err_free; 2243 2244 return 0; 2245 2246 err_free: 2247 kfree(info); 2248 return -EINVAL; 2249 } 2250 2251 static void __devexit ipmi_pnp_remove(struct pnp_dev *dev) 2252 { 2253 struct smi_info *info = pnp_get_drvdata(dev); 2254 2255 cleanup_one_si(info); 2256 } 2257 2258 static const struct pnp_device_id pnp_dev_table[] = { 2259 {"IPI0001", 0}, 2260 {"", 0}, 2261 }; 2262 2263 static struct pnp_driver ipmi_pnp_driver = { 2264 .name = DEVICE_NAME, 2265 .probe = ipmi_pnp_probe, 2266 .remove = __devexit_p(ipmi_pnp_remove), 2267 .id_table = pnp_dev_table, 2268 }; 2269 #endif 2270 2271 #ifdef CONFIG_DMI 2272 struct dmi_ipmi_data { 2273 u8 type; 2274 u8 addr_space; 2275 unsigned long base_addr; 2276 u8 irq; 2277 u8 offset; 2278 u8 slave_addr; 2279 }; 2280 2281 static int __devinit decode_dmi(const struct dmi_header *dm, 2282 struct dmi_ipmi_data *dmi) 2283 { 2284 const u8 *data = (const u8 *)dm; 2285 unsigned long base_addr; 2286 u8 reg_spacing; 2287 u8 len = dm->length; 2288 2289 dmi->type = data[4]; 2290 2291 memcpy(&base_addr, data+8, sizeof(unsigned long)); 2292 if (len >= 0x11) { 2293 if (base_addr & 1) { 2294 /* I/O */ 2295 base_addr &= 0xFFFE; 2296 dmi->addr_space = IPMI_IO_ADDR_SPACE; 2297 } else 2298 /* Memory */ 2299 dmi->addr_space = IPMI_MEM_ADDR_SPACE; 2300 2301 /* If bit 4 of byte 0x10 is set, then the lsb for the address 2302 is odd. */ 2303 dmi->base_addr = base_addr | ((data[0x10] & 0x10) >> 4); 2304 2305 dmi->irq = data[0x11]; 2306 2307 /* The top two bits of byte 0x10 hold the register spacing. */ 2308 reg_spacing = (data[0x10] & 0xC0) >> 6; 2309 switch (reg_spacing) { 2310 case 0x00: /* Byte boundaries */ 2311 dmi->offset = 1; 2312 break; 2313 case 0x01: /* 32-bit boundaries */ 2314 dmi->offset = 4; 2315 break; 2316 case 0x02: /* 16-byte boundaries */ 2317 dmi->offset = 16; 2318 break; 2319 default: 2320 /* Some other interface, just ignore it. */ 2321 return -EIO; 2322 } 2323 } else { 2324 /* Old DMI spec. */ 2325 /* 2326 * Note that technically, the lower bit of the base 2327 * address should be 1 if the address is I/O and 0 if 2328 * the address is in memory. So many systems get that 2329 * wrong (and all that I have seen are I/O) so we just 2330 * ignore that bit and assume I/O. Systems that use 2331 * memory should use the newer spec, anyway. 2332 */ 2333 dmi->base_addr = base_addr & 0xfffe; 2334 dmi->addr_space = IPMI_IO_ADDR_SPACE; 2335 dmi->offset = 1; 2336 } 2337 2338 dmi->slave_addr = data[6]; 2339 2340 return 0; 2341 } 2342 2343 static void __devinit try_init_dmi(struct dmi_ipmi_data *ipmi_data) 2344 { 2345 struct smi_info *info; 2346 2347 info = smi_info_alloc(); 2348 if (!info) { 2349 printk(KERN_ERR PFX "Could not allocate SI data\n"); 2350 return; 2351 } 2352 2353 info->addr_source = SI_SMBIOS; 2354 printk(KERN_INFO PFX "probing via SMBIOS\n"); 2355 2356 switch (ipmi_data->type) { 2357 case 0x01: /* KCS */ 2358 info->si_type = SI_KCS; 2359 break; 2360 case 0x02: /* SMIC */ 2361 info->si_type = SI_SMIC; 2362 break; 2363 case 0x03: /* BT */ 2364 info->si_type = SI_BT; 2365 break; 2366 default: 2367 kfree(info); 2368 return; 2369 } 2370 2371 switch (ipmi_data->addr_space) { 2372 case IPMI_MEM_ADDR_SPACE: 2373 info->io_setup = mem_setup; 2374 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2375 break; 2376 2377 case IPMI_IO_ADDR_SPACE: 2378 info->io_setup = port_setup; 2379 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2380 break; 2381 2382 default: 2383 kfree(info); 2384 printk(KERN_WARNING PFX "Unknown SMBIOS I/O Address type: %d\n", 2385 ipmi_data->addr_space); 2386 return; 2387 } 2388 info->io.addr_data = ipmi_data->base_addr; 2389 2390 info->io.regspacing = ipmi_data->offset; 2391 if (!info->io.regspacing) 2392 info->io.regspacing = DEFAULT_REGSPACING; 2393 info->io.regsize = DEFAULT_REGSPACING; 2394 info->io.regshift = 0; 2395 2396 info->slave_addr = ipmi_data->slave_addr; 2397 2398 info->irq = ipmi_data->irq; 2399 if (info->irq) 2400 info->irq_setup = std_irq_setup; 2401 2402 pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n", 2403 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem", 2404 info->io.addr_data, info->io.regsize, info->io.regspacing, 2405 info->irq); 2406 2407 if (add_smi(info)) 2408 kfree(info); 2409 } 2410 2411 static void __devinit dmi_find_bmc(void) 2412 { 2413 const struct dmi_device *dev = NULL; 2414 struct dmi_ipmi_data data; 2415 int rv; 2416 2417 while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) { 2418 memset(&data, 0, sizeof(data)); 2419 rv = decode_dmi((const struct dmi_header *) dev->device_data, 2420 &data); 2421 if (!rv) 2422 try_init_dmi(&data); 2423 } 2424 } 2425 #endif /* CONFIG_DMI */ 2426 2427 #ifdef CONFIG_PCI 2428 2429 #define PCI_ERMC_CLASSCODE 0x0C0700 2430 #define PCI_ERMC_CLASSCODE_MASK 0xffffff00 2431 #define PCI_ERMC_CLASSCODE_TYPE_MASK 0xff 2432 #define PCI_ERMC_CLASSCODE_TYPE_SMIC 0x00 2433 #define PCI_ERMC_CLASSCODE_TYPE_KCS 0x01 2434 #define PCI_ERMC_CLASSCODE_TYPE_BT 0x02 2435 2436 #define PCI_HP_VENDOR_ID 0x103C 2437 #define PCI_MMC_DEVICE_ID 0x121A 2438 #define PCI_MMC_ADDR_CW 0x10 2439 2440 static void ipmi_pci_cleanup(struct smi_info *info) 2441 { 2442 struct pci_dev *pdev = info->addr_source_data; 2443 2444 pci_disable_device(pdev); 2445 } 2446 2447 static int __devinit ipmi_pci_probe(struct pci_dev *pdev, 2448 const struct pci_device_id *ent) 2449 { 2450 int rv; 2451 int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK; 2452 struct smi_info *info; 2453 2454 info = smi_info_alloc(); 2455 if (!info) 2456 return -ENOMEM; 2457 2458 info->addr_source = SI_PCI; 2459 dev_info(&pdev->dev, "probing via PCI"); 2460 2461 switch (class_type) { 2462 case PCI_ERMC_CLASSCODE_TYPE_SMIC: 2463 info->si_type = SI_SMIC; 2464 break; 2465 2466 case PCI_ERMC_CLASSCODE_TYPE_KCS: 2467 info->si_type = SI_KCS; 2468 break; 2469 2470 case PCI_ERMC_CLASSCODE_TYPE_BT: 2471 info->si_type = SI_BT; 2472 break; 2473 2474 default: 2475 kfree(info); 2476 dev_info(&pdev->dev, "Unknown IPMI type: %d\n", class_type); 2477 return -ENOMEM; 2478 } 2479 2480 rv = pci_enable_device(pdev); 2481 if (rv) { 2482 dev_err(&pdev->dev, "couldn't enable PCI device\n"); 2483 kfree(info); 2484 return rv; 2485 } 2486 2487 info->addr_source_cleanup = ipmi_pci_cleanup; 2488 info->addr_source_data = pdev; 2489 2490 if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) { 2491 info->io_setup = port_setup; 2492 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2493 } else { 2494 info->io_setup = mem_setup; 2495 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2496 } 2497 info->io.addr_data = pci_resource_start(pdev, 0); 2498 2499 info->io.regspacing = DEFAULT_REGSPACING; 2500 info->io.regsize = DEFAULT_REGSPACING; 2501 info->io.regshift = 0; 2502 2503 info->irq = pdev->irq; 2504 if (info->irq) 2505 info->irq_setup = std_irq_setup; 2506 2507 info->dev = &pdev->dev; 2508 pci_set_drvdata(pdev, info); 2509 2510 dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n", 2511 &pdev->resource[0], info->io.regsize, info->io.regspacing, 2512 info->irq); 2513 2514 if (add_smi(info)) 2515 kfree(info); 2516 2517 return 0; 2518 } 2519 2520 static void __devexit ipmi_pci_remove(struct pci_dev *pdev) 2521 { 2522 struct smi_info *info = pci_get_drvdata(pdev); 2523 cleanup_one_si(info); 2524 } 2525 2526 #ifdef CONFIG_PM 2527 static int ipmi_pci_suspend(struct pci_dev *pdev, pm_message_t state) 2528 { 2529 return 0; 2530 } 2531 2532 static int ipmi_pci_resume(struct pci_dev *pdev) 2533 { 2534 return 0; 2535 } 2536 #endif 2537 2538 static struct pci_device_id ipmi_pci_devices[] = { 2539 { PCI_DEVICE(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID) }, 2540 { PCI_DEVICE_CLASS(PCI_ERMC_CLASSCODE, PCI_ERMC_CLASSCODE_MASK) }, 2541 { 0, } 2542 }; 2543 MODULE_DEVICE_TABLE(pci, ipmi_pci_devices); 2544 2545 static struct pci_driver ipmi_pci_driver = { 2546 .name = DEVICE_NAME, 2547 .id_table = ipmi_pci_devices, 2548 .probe = ipmi_pci_probe, 2549 .remove = __devexit_p(ipmi_pci_remove), 2550 #ifdef CONFIG_PM 2551 .suspend = ipmi_pci_suspend, 2552 .resume = ipmi_pci_resume, 2553 #endif 2554 }; 2555 #endif /* CONFIG_PCI */ 2556 2557 static int __devinit ipmi_probe(struct platform_device *dev) 2558 { 2559 #ifdef CONFIG_OF 2560 struct smi_info *info; 2561 struct resource resource; 2562 const __be32 *regsize, *regspacing, *regshift; 2563 struct device_node *np = dev->dev.of_node; 2564 int ret; 2565 int proplen; 2566 2567 dev_info(&dev->dev, "probing via device tree\n"); 2568 2569 if (!dev->dev.of_match) 2570 return -EINVAL; 2571 2572 ret = of_address_to_resource(np, 0, &resource); 2573 if (ret) { 2574 dev_warn(&dev->dev, PFX "invalid address from OF\n"); 2575 return ret; 2576 } 2577 2578 regsize = of_get_property(np, "reg-size", &proplen); 2579 if (regsize && proplen != 4) { 2580 dev_warn(&dev->dev, PFX "invalid regsize from OF\n"); 2581 return -EINVAL; 2582 } 2583 2584 regspacing = of_get_property(np, "reg-spacing", &proplen); 2585 if (regspacing && proplen != 4) { 2586 dev_warn(&dev->dev, PFX "invalid regspacing from OF\n"); 2587 return -EINVAL; 2588 } 2589 2590 regshift = of_get_property(np, "reg-shift", &proplen); 2591 if (regshift && proplen != 4) { 2592 dev_warn(&dev->dev, PFX "invalid regshift from OF\n"); 2593 return -EINVAL; 2594 } 2595 2596 info = smi_info_alloc(); 2597 2598 if (!info) { 2599 dev_err(&dev->dev, 2600 "could not allocate memory for OF probe\n"); 2601 return -ENOMEM; 2602 } 2603 2604 info->si_type = (enum si_type) dev->dev.of_match->data; 2605 info->addr_source = SI_DEVICETREE; 2606 info->irq_setup = std_irq_setup; 2607 2608 if (resource.flags & IORESOURCE_IO) { 2609 info->io_setup = port_setup; 2610 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2611 } else { 2612 info->io_setup = mem_setup; 2613 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2614 } 2615 2616 info->io.addr_data = resource.start; 2617 2618 info->io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE; 2619 info->io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING; 2620 info->io.regshift = regshift ? be32_to_cpup(regshift) : 0; 2621 2622 info->irq = irq_of_parse_and_map(dev->dev.of_node, 0); 2623 info->dev = &dev->dev; 2624 2625 dev_dbg(&dev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n", 2626 info->io.addr_data, info->io.regsize, info->io.regspacing, 2627 info->irq); 2628 2629 dev_set_drvdata(&dev->dev, info); 2630 2631 if (add_smi(info)) { 2632 kfree(info); 2633 return -EBUSY; 2634 } 2635 #endif 2636 return 0; 2637 } 2638 2639 static int __devexit ipmi_remove(struct platform_device *dev) 2640 { 2641 #ifdef CONFIG_OF 2642 cleanup_one_si(dev_get_drvdata(&dev->dev)); 2643 #endif 2644 return 0; 2645 } 2646 2647 static struct of_device_id ipmi_match[] = 2648 { 2649 { .type = "ipmi", .compatible = "ipmi-kcs", 2650 .data = (void *)(unsigned long) SI_KCS }, 2651 { .type = "ipmi", .compatible = "ipmi-smic", 2652 .data = (void *)(unsigned long) SI_SMIC }, 2653 { .type = "ipmi", .compatible = "ipmi-bt", 2654 .data = (void *)(unsigned long) SI_BT }, 2655 {}, 2656 }; 2657 2658 static struct platform_driver ipmi_driver = { 2659 .driver = { 2660 .name = DEVICE_NAME, 2661 .owner = THIS_MODULE, 2662 .of_match_table = ipmi_match, 2663 }, 2664 .probe = ipmi_probe, 2665 .remove = __devexit_p(ipmi_remove), 2666 }; 2667 2668 static int wait_for_msg_done(struct smi_info *smi_info) 2669 { 2670 enum si_sm_result smi_result; 2671 2672 smi_result = smi_info->handlers->event(smi_info->si_sm, 0); 2673 for (;;) { 2674 if (smi_result == SI_SM_CALL_WITH_DELAY || 2675 smi_result == SI_SM_CALL_WITH_TICK_DELAY) { 2676 schedule_timeout_uninterruptible(1); 2677 smi_result = smi_info->handlers->event( 2678 smi_info->si_sm, 100); 2679 } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { 2680 smi_result = smi_info->handlers->event( 2681 smi_info->si_sm, 0); 2682 } else 2683 break; 2684 } 2685 if (smi_result == SI_SM_HOSED) 2686 /* 2687 * We couldn't get the state machine to run, so whatever's at 2688 * the port is probably not an IPMI SMI interface. 2689 */ 2690 return -ENODEV; 2691 2692 return 0; 2693 } 2694 2695 static int try_get_dev_id(struct smi_info *smi_info) 2696 { 2697 unsigned char msg[2]; 2698 unsigned char *resp; 2699 unsigned long resp_len; 2700 int rv = 0; 2701 2702 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); 2703 if (!resp) 2704 return -ENOMEM; 2705 2706 /* 2707 * Do a Get Device ID command, since it comes back with some 2708 * useful info. 2709 */ 2710 msg[0] = IPMI_NETFN_APP_REQUEST << 2; 2711 msg[1] = IPMI_GET_DEVICE_ID_CMD; 2712 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); 2713 2714 rv = wait_for_msg_done(smi_info); 2715 if (rv) 2716 goto out; 2717 2718 resp_len = smi_info->handlers->get_result(smi_info->si_sm, 2719 resp, IPMI_MAX_MSG_LENGTH); 2720 2721 /* Check and record info from the get device id, in case we need it. */ 2722 rv = ipmi_demangle_device_id(resp, resp_len, &smi_info->device_id); 2723 2724 out: 2725 kfree(resp); 2726 return rv; 2727 } 2728 2729 static int try_enable_event_buffer(struct smi_info *smi_info) 2730 { 2731 unsigned char msg[3]; 2732 unsigned char *resp; 2733 unsigned long resp_len; 2734 int rv = 0; 2735 2736 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); 2737 if (!resp) 2738 return -ENOMEM; 2739 2740 msg[0] = IPMI_NETFN_APP_REQUEST << 2; 2741 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; 2742 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); 2743 2744 rv = wait_for_msg_done(smi_info); 2745 if (rv) { 2746 printk(KERN_WARNING PFX "Error getting response from get" 2747 " global enables command, the event buffer is not" 2748 " enabled.\n"); 2749 goto out; 2750 } 2751 2752 resp_len = smi_info->handlers->get_result(smi_info->si_sm, 2753 resp, IPMI_MAX_MSG_LENGTH); 2754 2755 if (resp_len < 4 || 2756 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || 2757 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || 2758 resp[2] != 0) { 2759 printk(KERN_WARNING PFX "Invalid return from get global" 2760 " enables command, cannot enable the event buffer.\n"); 2761 rv = -EINVAL; 2762 goto out; 2763 } 2764 2765 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) 2766 /* buffer is already enabled, nothing to do. */ 2767 goto out; 2768 2769 msg[0] = IPMI_NETFN_APP_REQUEST << 2; 2770 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; 2771 msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF; 2772 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); 2773 2774 rv = wait_for_msg_done(smi_info); 2775 if (rv) { 2776 printk(KERN_WARNING PFX "Error getting response from set" 2777 " global, enables command, the event buffer is not" 2778 " enabled.\n"); 2779 goto out; 2780 } 2781 2782 resp_len = smi_info->handlers->get_result(smi_info->si_sm, 2783 resp, IPMI_MAX_MSG_LENGTH); 2784 2785 if (resp_len < 3 || 2786 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || 2787 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { 2788 printk(KERN_WARNING PFX "Invalid return from get global," 2789 "enables command, not enable the event buffer.\n"); 2790 rv = -EINVAL; 2791 goto out; 2792 } 2793 2794 if (resp[2] != 0) 2795 /* 2796 * An error when setting the event buffer bit means 2797 * that the event buffer is not supported. 2798 */ 2799 rv = -ENOENT; 2800 out: 2801 kfree(resp); 2802 return rv; 2803 } 2804 2805 static int type_file_read_proc(char *page, char **start, off_t off, 2806 int count, int *eof, void *data) 2807 { 2808 struct smi_info *smi = data; 2809 2810 return sprintf(page, "%s\n", si_to_str[smi->si_type]); 2811 } 2812 2813 static int stat_file_read_proc(char *page, char **start, off_t off, 2814 int count, int *eof, void *data) 2815 { 2816 char *out = (char *) page; 2817 struct smi_info *smi = data; 2818 2819 out += sprintf(out, "interrupts_enabled: %d\n", 2820 smi->irq && !smi->interrupt_disabled); 2821 out += sprintf(out, "short_timeouts: %u\n", 2822 smi_get_stat(smi, short_timeouts)); 2823 out += sprintf(out, "long_timeouts: %u\n", 2824 smi_get_stat(smi, long_timeouts)); 2825 out += sprintf(out, "idles: %u\n", 2826 smi_get_stat(smi, idles)); 2827 out += sprintf(out, "interrupts: %u\n", 2828 smi_get_stat(smi, interrupts)); 2829 out += sprintf(out, "attentions: %u\n", 2830 smi_get_stat(smi, attentions)); 2831 out += sprintf(out, "flag_fetches: %u\n", 2832 smi_get_stat(smi, flag_fetches)); 2833 out += sprintf(out, "hosed_count: %u\n", 2834 smi_get_stat(smi, hosed_count)); 2835 out += sprintf(out, "complete_transactions: %u\n", 2836 smi_get_stat(smi, complete_transactions)); 2837 out += sprintf(out, "events: %u\n", 2838 smi_get_stat(smi, events)); 2839 out += sprintf(out, "watchdog_pretimeouts: %u\n", 2840 smi_get_stat(smi, watchdog_pretimeouts)); 2841 out += sprintf(out, "incoming_messages: %u\n", 2842 smi_get_stat(smi, incoming_messages)); 2843 2844 return out - page; 2845 } 2846 2847 static int param_read_proc(char *page, char **start, off_t off, 2848 int count, int *eof, void *data) 2849 { 2850 struct smi_info *smi = data; 2851 2852 return sprintf(page, 2853 "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n", 2854 si_to_str[smi->si_type], 2855 addr_space_to_str[smi->io.addr_type], 2856 smi->io.addr_data, 2857 smi->io.regspacing, 2858 smi->io.regsize, 2859 smi->io.regshift, 2860 smi->irq, 2861 smi->slave_addr); 2862 } 2863 2864 /* 2865 * oem_data_avail_to_receive_msg_avail 2866 * @info - smi_info structure with msg_flags set 2867 * 2868 * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL 2869 * Returns 1 indicating need to re-run handle_flags(). 2870 */ 2871 static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info) 2872 { 2873 smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) | 2874 RECEIVE_MSG_AVAIL); 2875 return 1; 2876 } 2877 2878 /* 2879 * setup_dell_poweredge_oem_data_handler 2880 * @info - smi_info.device_id must be populated 2881 * 2882 * Systems that match, but have firmware version < 1.40 may assert 2883 * OEM0_DATA_AVAIL on their own, without being told via Set Flags that 2884 * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL 2885 * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags 2886 * as RECEIVE_MSG_AVAIL instead. 2887 * 2888 * As Dell has no plans to release IPMI 1.5 firmware that *ever* 2889 * assert the OEM[012] bits, and if it did, the driver would have to 2890 * change to handle that properly, we don't actually check for the 2891 * firmware version. 2892 * Device ID = 0x20 BMC on PowerEdge 8G servers 2893 * Device Revision = 0x80 2894 * Firmware Revision1 = 0x01 BMC version 1.40 2895 * Firmware Revision2 = 0x40 BCD encoded 2896 * IPMI Version = 0x51 IPMI 1.5 2897 * Manufacturer ID = A2 02 00 Dell IANA 2898 * 2899 * Additionally, PowerEdge systems with IPMI < 1.5 may also assert 2900 * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL. 2901 * 2902 */ 2903 #define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20 2904 #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80 2905 #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51 2906 #define DELL_IANA_MFR_ID 0x0002a2 2907 static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info) 2908 { 2909 struct ipmi_device_id *id = &smi_info->device_id; 2910 if (id->manufacturer_id == DELL_IANA_MFR_ID) { 2911 if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID && 2912 id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV && 2913 id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) { 2914 smi_info->oem_data_avail_handler = 2915 oem_data_avail_to_receive_msg_avail; 2916 } else if (ipmi_version_major(id) < 1 || 2917 (ipmi_version_major(id) == 1 && 2918 ipmi_version_minor(id) < 5)) { 2919 smi_info->oem_data_avail_handler = 2920 oem_data_avail_to_receive_msg_avail; 2921 } 2922 } 2923 } 2924 2925 #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA 2926 static void return_hosed_msg_badsize(struct smi_info *smi_info) 2927 { 2928 struct ipmi_smi_msg *msg = smi_info->curr_msg; 2929 2930 /* Make it a reponse */ 2931 msg->rsp[0] = msg->data[0] | 4; 2932 msg->rsp[1] = msg->data[1]; 2933 msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH; 2934 msg->rsp_size = 3; 2935 smi_info->curr_msg = NULL; 2936 deliver_recv_msg(smi_info, msg); 2937 } 2938 2939 /* 2940 * dell_poweredge_bt_xaction_handler 2941 * @info - smi_info.device_id must be populated 2942 * 2943 * Dell PowerEdge servers with the BT interface (x6xx and 1750) will 2944 * not respond to a Get SDR command if the length of the data 2945 * requested is exactly 0x3A, which leads to command timeouts and no 2946 * data returned. This intercepts such commands, and causes userspace 2947 * callers to try again with a different-sized buffer, which succeeds. 2948 */ 2949 2950 #define STORAGE_NETFN 0x0A 2951 #define STORAGE_CMD_GET_SDR 0x23 2952 static int dell_poweredge_bt_xaction_handler(struct notifier_block *self, 2953 unsigned long unused, 2954 void *in) 2955 { 2956 struct smi_info *smi_info = in; 2957 unsigned char *data = smi_info->curr_msg->data; 2958 unsigned int size = smi_info->curr_msg->data_size; 2959 if (size >= 8 && 2960 (data[0]>>2) == STORAGE_NETFN && 2961 data[1] == STORAGE_CMD_GET_SDR && 2962 data[7] == 0x3A) { 2963 return_hosed_msg_badsize(smi_info); 2964 return NOTIFY_STOP; 2965 } 2966 return NOTIFY_DONE; 2967 } 2968 2969 static struct notifier_block dell_poweredge_bt_xaction_notifier = { 2970 .notifier_call = dell_poweredge_bt_xaction_handler, 2971 }; 2972 2973 /* 2974 * setup_dell_poweredge_bt_xaction_handler 2975 * @info - smi_info.device_id must be filled in already 2976 * 2977 * Fills in smi_info.device_id.start_transaction_pre_hook 2978 * when we know what function to use there. 2979 */ 2980 static void 2981 setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info) 2982 { 2983 struct ipmi_device_id *id = &smi_info->device_id; 2984 if (id->manufacturer_id == DELL_IANA_MFR_ID && 2985 smi_info->si_type == SI_BT) 2986 register_xaction_notifier(&dell_poweredge_bt_xaction_notifier); 2987 } 2988 2989 /* 2990 * setup_oem_data_handler 2991 * @info - smi_info.device_id must be filled in already 2992 * 2993 * Fills in smi_info.device_id.oem_data_available_handler 2994 * when we know what function to use there. 2995 */ 2996 2997 static void setup_oem_data_handler(struct smi_info *smi_info) 2998 { 2999 setup_dell_poweredge_oem_data_handler(smi_info); 3000 } 3001 3002 static void setup_xaction_handlers(struct smi_info *smi_info) 3003 { 3004 setup_dell_poweredge_bt_xaction_handler(smi_info); 3005 } 3006 3007 static inline void wait_for_timer_and_thread(struct smi_info *smi_info) 3008 { 3009 if (smi_info->intf) { 3010 /* 3011 * The timer and thread are only running if the 3012 * interface has been started up and registered. 3013 */ 3014 if (smi_info->thread != NULL) 3015 kthread_stop(smi_info->thread); 3016 del_timer_sync(&smi_info->si_timer); 3017 } 3018 } 3019 3020 static __devinitdata struct ipmi_default_vals 3021 { 3022 int type; 3023 int port; 3024 } ipmi_defaults[] = 3025 { 3026 { .type = SI_KCS, .port = 0xca2 }, 3027 { .type = SI_SMIC, .port = 0xca9 }, 3028 { .type = SI_BT, .port = 0xe4 }, 3029 { .port = 0 } 3030 }; 3031 3032 static void __devinit default_find_bmc(void) 3033 { 3034 struct smi_info *info; 3035 int i; 3036 3037 for (i = 0; ; i++) { 3038 if (!ipmi_defaults[i].port) 3039 break; 3040 #ifdef CONFIG_PPC 3041 if (check_legacy_ioport(ipmi_defaults[i].port)) 3042 continue; 3043 #endif 3044 info = smi_info_alloc(); 3045 if (!info) 3046 return; 3047 3048 info->addr_source = SI_DEFAULT; 3049 3050 info->si_type = ipmi_defaults[i].type; 3051 info->io_setup = port_setup; 3052 info->io.addr_data = ipmi_defaults[i].port; 3053 info->io.addr_type = IPMI_IO_ADDR_SPACE; 3054 3055 info->io.addr = NULL; 3056 info->io.regspacing = DEFAULT_REGSPACING; 3057 info->io.regsize = DEFAULT_REGSPACING; 3058 info->io.regshift = 0; 3059 3060 if (add_smi(info) == 0) { 3061 if ((try_smi_init(info)) == 0) { 3062 /* Found one... */ 3063 printk(KERN_INFO PFX "Found default %s" 3064 " state machine at %s address 0x%lx\n", 3065 si_to_str[info->si_type], 3066 addr_space_to_str[info->io.addr_type], 3067 info->io.addr_data); 3068 } else 3069 cleanup_one_si(info); 3070 } else { 3071 kfree(info); 3072 } 3073 } 3074 } 3075 3076 static int is_new_interface(struct smi_info *info) 3077 { 3078 struct smi_info *e; 3079 3080 list_for_each_entry(e, &smi_infos, link) { 3081 if (e->io.addr_type != info->io.addr_type) 3082 continue; 3083 if (e->io.addr_data == info->io.addr_data) 3084 return 0; 3085 } 3086 3087 return 1; 3088 } 3089 3090 static int add_smi(struct smi_info *new_smi) 3091 { 3092 int rv = 0; 3093 3094 printk(KERN_INFO PFX "Adding %s-specified %s state machine", 3095 ipmi_addr_src_to_str[new_smi->addr_source], 3096 si_to_str[new_smi->si_type]); 3097 mutex_lock(&smi_infos_lock); 3098 if (!is_new_interface(new_smi)) { 3099 printk(KERN_CONT " duplicate interface\n"); 3100 rv = -EBUSY; 3101 goto out_err; 3102 } 3103 3104 printk(KERN_CONT "\n"); 3105 3106 /* So we know not to free it unless we have allocated one. */ 3107 new_smi->intf = NULL; 3108 new_smi->si_sm = NULL; 3109 new_smi->handlers = NULL; 3110 3111 list_add_tail(&new_smi->link, &smi_infos); 3112 3113 out_err: 3114 mutex_unlock(&smi_infos_lock); 3115 return rv; 3116 } 3117 3118 static int try_smi_init(struct smi_info *new_smi) 3119 { 3120 int rv = 0; 3121 int i; 3122 3123 printk(KERN_INFO PFX "Trying %s-specified %s state" 3124 " machine at %s address 0x%lx, slave address 0x%x," 3125 " irq %d\n", 3126 ipmi_addr_src_to_str[new_smi->addr_source], 3127 si_to_str[new_smi->si_type], 3128 addr_space_to_str[new_smi->io.addr_type], 3129 new_smi->io.addr_data, 3130 new_smi->slave_addr, new_smi->irq); 3131 3132 switch (new_smi->si_type) { 3133 case SI_KCS: 3134 new_smi->handlers = &kcs_smi_handlers; 3135 break; 3136 3137 case SI_SMIC: 3138 new_smi->handlers = &smic_smi_handlers; 3139 break; 3140 3141 case SI_BT: 3142 new_smi->handlers = &bt_smi_handlers; 3143 break; 3144 3145 default: 3146 /* No support for anything else yet. */ 3147 rv = -EIO; 3148 goto out_err; 3149 } 3150 3151 /* Allocate the state machine's data and initialize it. */ 3152 new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL); 3153 if (!new_smi->si_sm) { 3154 printk(KERN_ERR PFX 3155 "Could not allocate state machine memory\n"); 3156 rv = -ENOMEM; 3157 goto out_err; 3158 } 3159 new_smi->io_size = new_smi->handlers->init_data(new_smi->si_sm, 3160 &new_smi->io); 3161 3162 /* Now that we know the I/O size, we can set up the I/O. */ 3163 rv = new_smi->io_setup(new_smi); 3164 if (rv) { 3165 printk(KERN_ERR PFX "Could not set up I/O space\n"); 3166 goto out_err; 3167 } 3168 3169 /* Do low-level detection first. */ 3170 if (new_smi->handlers->detect(new_smi->si_sm)) { 3171 if (new_smi->addr_source) 3172 printk(KERN_INFO PFX "Interface detection failed\n"); 3173 rv = -ENODEV; 3174 goto out_err; 3175 } 3176 3177 /* 3178 * Attempt a get device id command. If it fails, we probably 3179 * don't have a BMC here. 3180 */ 3181 rv = try_get_dev_id(new_smi); 3182 if (rv) { 3183 if (new_smi->addr_source) 3184 printk(KERN_INFO PFX "There appears to be no BMC" 3185 " at this location\n"); 3186 goto out_err; 3187 } 3188 3189 setup_oem_data_handler(new_smi); 3190 setup_xaction_handlers(new_smi); 3191 3192 INIT_LIST_HEAD(&(new_smi->xmit_msgs)); 3193 INIT_LIST_HEAD(&(new_smi->hp_xmit_msgs)); 3194 new_smi->curr_msg = NULL; 3195 atomic_set(&new_smi->req_events, 0); 3196 new_smi->run_to_completion = 0; 3197 for (i = 0; i < SI_NUM_STATS; i++) 3198 atomic_set(&new_smi->stats[i], 0); 3199 3200 new_smi->interrupt_disabled = 1; 3201 atomic_set(&new_smi->stop_operation, 0); 3202 new_smi->intf_num = smi_num; 3203 smi_num++; 3204 3205 rv = try_enable_event_buffer(new_smi); 3206 if (rv == 0) 3207 new_smi->has_event_buffer = 1; 3208 3209 /* 3210 * Start clearing the flags before we enable interrupts or the 3211 * timer to avoid racing with the timer. 3212 */ 3213 start_clear_flags(new_smi); 3214 /* IRQ is defined to be set when non-zero. */ 3215 if (new_smi->irq) 3216 new_smi->si_state = SI_CLEARING_FLAGS_THEN_SET_IRQ; 3217 3218 if (!new_smi->dev) { 3219 /* 3220 * If we don't already have a device from something 3221 * else (like PCI), then register a new one. 3222 */ 3223 new_smi->pdev = platform_device_alloc("ipmi_si", 3224 new_smi->intf_num); 3225 if (!new_smi->pdev) { 3226 printk(KERN_ERR PFX 3227 "Unable to allocate platform device\n"); 3228 goto out_err; 3229 } 3230 new_smi->dev = &new_smi->pdev->dev; 3231 new_smi->dev->driver = &ipmi_driver.driver; 3232 3233 rv = platform_device_add(new_smi->pdev); 3234 if (rv) { 3235 printk(KERN_ERR PFX 3236 "Unable to register system interface device:" 3237 " %d\n", 3238 rv); 3239 goto out_err; 3240 } 3241 new_smi->dev_registered = 1; 3242 } 3243 3244 rv = ipmi_register_smi(&handlers, 3245 new_smi, 3246 &new_smi->device_id, 3247 new_smi->dev, 3248 "bmc", 3249 new_smi->slave_addr); 3250 if (rv) { 3251 dev_err(new_smi->dev, "Unable to register device: error %d\n", 3252 rv); 3253 goto out_err_stop_timer; 3254 } 3255 3256 rv = ipmi_smi_add_proc_entry(new_smi->intf, "type", 3257 type_file_read_proc, 3258 new_smi); 3259 if (rv) { 3260 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv); 3261 goto out_err_stop_timer; 3262 } 3263 3264 rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats", 3265 stat_file_read_proc, 3266 new_smi); 3267 if (rv) { 3268 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv); 3269 goto out_err_stop_timer; 3270 } 3271 3272 rv = ipmi_smi_add_proc_entry(new_smi->intf, "params", 3273 param_read_proc, 3274 new_smi); 3275 if (rv) { 3276 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv); 3277 goto out_err_stop_timer; 3278 } 3279 3280 dev_info(new_smi->dev, "IPMI %s interface initialized\n", 3281 si_to_str[new_smi->si_type]); 3282 3283 return 0; 3284 3285 out_err_stop_timer: 3286 atomic_inc(&new_smi->stop_operation); 3287 wait_for_timer_and_thread(new_smi); 3288 3289 out_err: 3290 new_smi->interrupt_disabled = 1; 3291 3292 if (new_smi->intf) { 3293 ipmi_unregister_smi(new_smi->intf); 3294 new_smi->intf = NULL; 3295 } 3296 3297 if (new_smi->irq_cleanup) { 3298 new_smi->irq_cleanup(new_smi); 3299 new_smi->irq_cleanup = NULL; 3300 } 3301 3302 /* 3303 * Wait until we know that we are out of any interrupt 3304 * handlers might have been running before we freed the 3305 * interrupt. 3306 */ 3307 synchronize_sched(); 3308 3309 if (new_smi->si_sm) { 3310 if (new_smi->handlers) 3311 new_smi->handlers->cleanup(new_smi->si_sm); 3312 kfree(new_smi->si_sm); 3313 new_smi->si_sm = NULL; 3314 } 3315 if (new_smi->addr_source_cleanup) { 3316 new_smi->addr_source_cleanup(new_smi); 3317 new_smi->addr_source_cleanup = NULL; 3318 } 3319 if (new_smi->io_cleanup) { 3320 new_smi->io_cleanup(new_smi); 3321 new_smi->io_cleanup = NULL; 3322 } 3323 3324 if (new_smi->dev_registered) { 3325 platform_device_unregister(new_smi->pdev); 3326 new_smi->dev_registered = 0; 3327 } 3328 3329 return rv; 3330 } 3331 3332 static int __devinit init_ipmi_si(void) 3333 { 3334 int i; 3335 char *str; 3336 int rv; 3337 struct smi_info *e; 3338 enum ipmi_addr_src type = SI_INVALID; 3339 3340 if (initialized) 3341 return 0; 3342 initialized = 1; 3343 3344 rv = platform_driver_register(&ipmi_driver); 3345 if (rv) { 3346 printk(KERN_ERR PFX "Unable to register driver: %d\n", rv); 3347 return rv; 3348 } 3349 3350 3351 /* Parse out the si_type string into its components. */ 3352 str = si_type_str; 3353 if (*str != '\0') { 3354 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) { 3355 si_type[i] = str; 3356 str = strchr(str, ','); 3357 if (str) { 3358 *str = '\0'; 3359 str++; 3360 } else { 3361 break; 3362 } 3363 } 3364 } 3365 3366 printk(KERN_INFO "IPMI System Interface driver.\n"); 3367 3368 /* If the user gave us a device, they presumably want us to use it */ 3369 if (!hardcode_find_bmc()) 3370 return 0; 3371 3372 #ifdef CONFIG_PCI 3373 rv = pci_register_driver(&ipmi_pci_driver); 3374 if (rv) 3375 printk(KERN_ERR PFX "Unable to register PCI driver: %d\n", rv); 3376 else 3377 pci_registered = 1; 3378 #endif 3379 3380 #ifdef CONFIG_ACPI 3381 pnp_register_driver(&ipmi_pnp_driver); 3382 pnp_registered = 1; 3383 #endif 3384 3385 #ifdef CONFIG_DMI 3386 dmi_find_bmc(); 3387 #endif 3388 3389 #ifdef CONFIG_ACPI 3390 spmi_find_bmc(); 3391 #endif 3392 3393 /* We prefer devices with interrupts, but in the case of a machine 3394 with multiple BMCs we assume that there will be several instances 3395 of a given type so if we succeed in registering a type then also 3396 try to register everything else of the same type */ 3397 3398 mutex_lock(&smi_infos_lock); 3399 list_for_each_entry(e, &smi_infos, link) { 3400 /* Try to register a device if it has an IRQ and we either 3401 haven't successfully registered a device yet or this 3402 device has the same type as one we successfully registered */ 3403 if (e->irq && (!type || e->addr_source == type)) { 3404 if (!try_smi_init(e)) { 3405 type = e->addr_source; 3406 } 3407 } 3408 } 3409 3410 /* type will only have been set if we successfully registered an si */ 3411 if (type) { 3412 mutex_unlock(&smi_infos_lock); 3413 return 0; 3414 } 3415 3416 /* Fall back to the preferred device */ 3417 3418 list_for_each_entry(e, &smi_infos, link) { 3419 if (!e->irq && (!type || e->addr_source == type)) { 3420 if (!try_smi_init(e)) { 3421 type = e->addr_source; 3422 } 3423 } 3424 } 3425 mutex_unlock(&smi_infos_lock); 3426 3427 if (type) 3428 return 0; 3429 3430 if (si_trydefaults) { 3431 mutex_lock(&smi_infos_lock); 3432 if (list_empty(&smi_infos)) { 3433 /* No BMC was found, try defaults. */ 3434 mutex_unlock(&smi_infos_lock); 3435 default_find_bmc(); 3436 } else 3437 mutex_unlock(&smi_infos_lock); 3438 } 3439 3440 mutex_lock(&smi_infos_lock); 3441 if (unload_when_empty && list_empty(&smi_infos)) { 3442 mutex_unlock(&smi_infos_lock); 3443 cleanup_ipmi_si(); 3444 printk(KERN_WARNING PFX 3445 "Unable to find any System Interface(s)\n"); 3446 return -ENODEV; 3447 } else { 3448 mutex_unlock(&smi_infos_lock); 3449 return 0; 3450 } 3451 } 3452 module_init(init_ipmi_si); 3453 3454 static void cleanup_one_si(struct smi_info *to_clean) 3455 { 3456 int rv = 0; 3457 unsigned long flags; 3458 3459 if (!to_clean) 3460 return; 3461 3462 list_del(&to_clean->link); 3463 3464 /* Tell the driver that we are shutting down. */ 3465 atomic_inc(&to_clean->stop_operation); 3466 3467 /* 3468 * Make sure the timer and thread are stopped and will not run 3469 * again. 3470 */ 3471 wait_for_timer_and_thread(to_clean); 3472 3473 /* 3474 * Timeouts are stopped, now make sure the interrupts are off 3475 * for the device. A little tricky with locks to make sure 3476 * there are no races. 3477 */ 3478 spin_lock_irqsave(&to_clean->si_lock, flags); 3479 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) { 3480 spin_unlock_irqrestore(&to_clean->si_lock, flags); 3481 poll(to_clean); 3482 schedule_timeout_uninterruptible(1); 3483 spin_lock_irqsave(&to_clean->si_lock, flags); 3484 } 3485 disable_si_irq(to_clean); 3486 spin_unlock_irqrestore(&to_clean->si_lock, flags); 3487 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) { 3488 poll(to_clean); 3489 schedule_timeout_uninterruptible(1); 3490 } 3491 3492 /* Clean up interrupts and make sure that everything is done. */ 3493 if (to_clean->irq_cleanup) 3494 to_clean->irq_cleanup(to_clean); 3495 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) { 3496 poll(to_clean); 3497 schedule_timeout_uninterruptible(1); 3498 } 3499 3500 if (to_clean->intf) 3501 rv = ipmi_unregister_smi(to_clean->intf); 3502 3503 if (rv) { 3504 printk(KERN_ERR PFX "Unable to unregister device: errno=%d\n", 3505 rv); 3506 } 3507 3508 if (to_clean->handlers) 3509 to_clean->handlers->cleanup(to_clean->si_sm); 3510 3511 kfree(to_clean->si_sm); 3512 3513 if (to_clean->addr_source_cleanup) 3514 to_clean->addr_source_cleanup(to_clean); 3515 if (to_clean->io_cleanup) 3516 to_clean->io_cleanup(to_clean); 3517 3518 if (to_clean->dev_registered) 3519 platform_device_unregister(to_clean->pdev); 3520 3521 kfree(to_clean); 3522 } 3523 3524 static void __exit cleanup_ipmi_si(void) 3525 { 3526 struct smi_info *e, *tmp_e; 3527 3528 if (!initialized) 3529 return; 3530 3531 #ifdef CONFIG_PCI 3532 if (pci_registered) 3533 pci_unregister_driver(&ipmi_pci_driver); 3534 #endif 3535 #ifdef CONFIG_ACPI 3536 if (pnp_registered) 3537 pnp_unregister_driver(&ipmi_pnp_driver); 3538 #endif 3539 3540 platform_driver_unregister(&ipmi_driver); 3541 3542 mutex_lock(&smi_infos_lock); 3543 list_for_each_entry_safe(e, tmp_e, &smi_infos, link) 3544 cleanup_one_si(e); 3545 mutex_unlock(&smi_infos_lock); 3546 } 3547 module_exit(cleanup_ipmi_si); 3548 3549 MODULE_LICENSE("GPL"); 3550 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); 3551 MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT" 3552 " system interfaces."); 3553