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 <linux/sched.h> 45 #include <linux/seq_file.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/dmi.h> 65 #include <linux/string.h> 66 #include <linux/ctype.h> 67 #include <linux/of_device.h> 68 #include <linux/of_platform.h> 69 #include <linux/of_address.h> 70 #include <linux/of_irq.h> 71 #include <linux/acpi.h> 72 73 #ifdef CONFIG_PARISC 74 #include <asm/hardware.h> /* for register_parisc_driver() stuff */ 75 #include <asm/parisc-device.h> 76 #endif 77 78 #define PFX "ipmi_si: " 79 80 /* Measure times between events in the driver. */ 81 #undef DEBUG_TIMING 82 83 /* Call every 10 ms. */ 84 #define SI_TIMEOUT_TIME_USEC 10000 85 #define SI_USEC_PER_JIFFY (1000000/HZ) 86 #define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY) 87 #define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a 88 short timeout */ 89 90 enum si_intf_state { 91 SI_NORMAL, 92 SI_GETTING_FLAGS, 93 SI_GETTING_EVENTS, 94 SI_CLEARING_FLAGS, 95 SI_GETTING_MESSAGES, 96 SI_CHECKING_ENABLES, 97 SI_SETTING_ENABLES 98 /* FIXME - add watchdog stuff. */ 99 }; 100 101 /* Some BT-specific defines we need here. */ 102 #define IPMI_BT_INTMASK_REG 2 103 #define IPMI_BT_INTMASK_CLEAR_IRQ_BIT 2 104 #define IPMI_BT_INTMASK_ENABLE_IRQ_BIT 1 105 106 enum si_type { 107 SI_KCS, SI_SMIC, SI_BT 108 }; 109 110 static const char * const si_to_str[] = { "kcs", "smic", "bt" }; 111 112 #define DEVICE_NAME "ipmi_si" 113 114 static struct platform_driver ipmi_driver; 115 116 /* 117 * Indexes into stats[] in smi_info below. 118 */ 119 enum si_stat_indexes { 120 /* 121 * Number of times the driver requested a timer while an operation 122 * was in progress. 123 */ 124 SI_STAT_short_timeouts = 0, 125 126 /* 127 * Number of times the driver requested a timer while nothing was in 128 * progress. 129 */ 130 SI_STAT_long_timeouts, 131 132 /* Number of times the interface was idle while being polled. */ 133 SI_STAT_idles, 134 135 /* Number of interrupts the driver handled. */ 136 SI_STAT_interrupts, 137 138 /* Number of time the driver got an ATTN from the hardware. */ 139 SI_STAT_attentions, 140 141 /* Number of times the driver requested flags from the hardware. */ 142 SI_STAT_flag_fetches, 143 144 /* Number of times the hardware didn't follow the state machine. */ 145 SI_STAT_hosed_count, 146 147 /* Number of completed messages. */ 148 SI_STAT_complete_transactions, 149 150 /* Number of IPMI events received from the hardware. */ 151 SI_STAT_events, 152 153 /* Number of watchdog pretimeouts. */ 154 SI_STAT_watchdog_pretimeouts, 155 156 /* Number of asynchronous messages received. */ 157 SI_STAT_incoming_messages, 158 159 160 /* This *must* remain last, add new values above this. */ 161 SI_NUM_STATS 162 }; 163 164 struct smi_info { 165 int intf_num; 166 ipmi_smi_t intf; 167 struct si_sm_data *si_sm; 168 const struct si_sm_handlers *handlers; 169 enum si_type si_type; 170 spinlock_t si_lock; 171 struct ipmi_smi_msg *waiting_msg; 172 struct ipmi_smi_msg *curr_msg; 173 enum si_intf_state si_state; 174 175 /* 176 * Used to handle the various types of I/O that can occur with 177 * IPMI 178 */ 179 struct si_sm_io io; 180 int (*io_setup)(struct smi_info *info); 181 void (*io_cleanup)(struct smi_info *info); 182 int (*irq_setup)(struct smi_info *info); 183 void (*irq_cleanup)(struct smi_info *info); 184 unsigned int io_size; 185 enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */ 186 void (*addr_source_cleanup)(struct smi_info *info); 187 void *addr_source_data; 188 189 /* 190 * Per-OEM handler, called from handle_flags(). Returns 1 191 * when handle_flags() needs to be re-run or 0 indicating it 192 * set si_state itself. 193 */ 194 int (*oem_data_avail_handler)(struct smi_info *smi_info); 195 196 /* 197 * Flags from the last GET_MSG_FLAGS command, used when an ATTN 198 * is set to hold the flags until we are done handling everything 199 * from the flags. 200 */ 201 #define RECEIVE_MSG_AVAIL 0x01 202 #define EVENT_MSG_BUFFER_FULL 0x02 203 #define WDT_PRE_TIMEOUT_INT 0x08 204 #define OEM0_DATA_AVAIL 0x20 205 #define OEM1_DATA_AVAIL 0x40 206 #define OEM2_DATA_AVAIL 0x80 207 #define OEM_DATA_AVAIL (OEM0_DATA_AVAIL | \ 208 OEM1_DATA_AVAIL | \ 209 OEM2_DATA_AVAIL) 210 unsigned char msg_flags; 211 212 /* Does the BMC have an event buffer? */ 213 bool has_event_buffer; 214 215 /* 216 * If set to true, this will request events the next time the 217 * state machine is idle. 218 */ 219 atomic_t req_events; 220 221 /* 222 * If true, run the state machine to completion on every send 223 * call. Generally used after a panic to make sure stuff goes 224 * out. 225 */ 226 bool run_to_completion; 227 228 /* The I/O port of an SI interface. */ 229 int port; 230 231 /* 232 * The space between start addresses of the two ports. For 233 * instance, if the first port is 0xca2 and the spacing is 4, then 234 * the second port is 0xca6. 235 */ 236 unsigned int spacing; 237 238 /* zero if no irq; */ 239 int irq; 240 241 /* The timer for this si. */ 242 struct timer_list si_timer; 243 244 /* This flag is set, if the timer is running (timer_pending() isn't enough) */ 245 bool timer_running; 246 247 /* The time (in jiffies) the last timeout occurred at. */ 248 unsigned long last_timeout_jiffies; 249 250 /* Are we waiting for the events, pretimeouts, received msgs? */ 251 atomic_t need_watch; 252 253 /* 254 * The driver will disable interrupts when it gets into a 255 * situation where it cannot handle messages due to lack of 256 * memory. Once that situation clears up, it will re-enable 257 * interrupts. 258 */ 259 bool interrupt_disabled; 260 261 /* 262 * Does the BMC support events? 263 */ 264 bool supports_event_msg_buff; 265 266 /* 267 * Can we disable interrupts the global enables receive irq 268 * bit? There are currently two forms of brokenness, some 269 * systems cannot disable the bit (which is technically within 270 * the spec but a bad idea) and some systems have the bit 271 * forced to zero even though interrupts work (which is 272 * clearly outside the spec). The next bool tells which form 273 * of brokenness is present. 274 */ 275 bool cannot_disable_irq; 276 277 /* 278 * Some systems are broken and cannot set the irq enable 279 * bit, even if they support interrupts. 280 */ 281 bool irq_enable_broken; 282 283 /* 284 * Did we get an attention that we did not handle? 285 */ 286 bool got_attn; 287 288 /* From the get device id response... */ 289 struct ipmi_device_id device_id; 290 291 /* Driver model stuff. */ 292 struct device *dev; 293 struct platform_device *pdev; 294 295 /* 296 * True if we allocated the device, false if it came from 297 * someplace else (like PCI). 298 */ 299 bool dev_registered; 300 301 /* Slave address, could be reported from DMI. */ 302 unsigned char slave_addr; 303 304 /* Counters and things for the proc filesystem. */ 305 atomic_t stats[SI_NUM_STATS]; 306 307 struct task_struct *thread; 308 309 struct list_head link; 310 union ipmi_smi_info_union addr_info; 311 }; 312 313 #define smi_inc_stat(smi, stat) \ 314 atomic_inc(&(smi)->stats[SI_STAT_ ## stat]) 315 #define smi_get_stat(smi, stat) \ 316 ((unsigned int) atomic_read(&(smi)->stats[SI_STAT_ ## stat])) 317 318 #define SI_MAX_PARMS 4 319 320 static int force_kipmid[SI_MAX_PARMS]; 321 static int num_force_kipmid; 322 #ifdef CONFIG_PCI 323 static bool pci_registered; 324 #endif 325 #ifdef CONFIG_PARISC 326 static bool parisc_registered; 327 #endif 328 329 static unsigned int kipmid_max_busy_us[SI_MAX_PARMS]; 330 static int num_max_busy_us; 331 332 static bool unload_when_empty = true; 333 334 static int add_smi(struct smi_info *smi); 335 static int try_smi_init(struct smi_info *smi); 336 static void cleanup_one_si(struct smi_info *to_clean); 337 static void cleanup_ipmi_si(void); 338 339 #ifdef DEBUG_TIMING 340 void debug_timestamp(char *msg) 341 { 342 struct timespec64 t; 343 344 getnstimeofday64(&t); 345 pr_debug("**%s: %lld.%9.9ld\n", msg, (long long) t.tv_sec, t.tv_nsec); 346 } 347 #else 348 #define debug_timestamp(x) 349 #endif 350 351 static ATOMIC_NOTIFIER_HEAD(xaction_notifier_list); 352 static int register_xaction_notifier(struct notifier_block *nb) 353 { 354 return atomic_notifier_chain_register(&xaction_notifier_list, nb); 355 } 356 357 static void deliver_recv_msg(struct smi_info *smi_info, 358 struct ipmi_smi_msg *msg) 359 { 360 /* Deliver the message to the upper layer. */ 361 if (smi_info->intf) 362 ipmi_smi_msg_received(smi_info->intf, msg); 363 else 364 ipmi_free_smi_msg(msg); 365 } 366 367 static void return_hosed_msg(struct smi_info *smi_info, int cCode) 368 { 369 struct ipmi_smi_msg *msg = smi_info->curr_msg; 370 371 if (cCode < 0 || cCode > IPMI_ERR_UNSPECIFIED) 372 cCode = IPMI_ERR_UNSPECIFIED; 373 /* else use it as is */ 374 375 /* Make it a response */ 376 msg->rsp[0] = msg->data[0] | 4; 377 msg->rsp[1] = msg->data[1]; 378 msg->rsp[2] = cCode; 379 msg->rsp_size = 3; 380 381 smi_info->curr_msg = NULL; 382 deliver_recv_msg(smi_info, msg); 383 } 384 385 static enum si_sm_result start_next_msg(struct smi_info *smi_info) 386 { 387 int rv; 388 389 if (!smi_info->waiting_msg) { 390 smi_info->curr_msg = NULL; 391 rv = SI_SM_IDLE; 392 } else { 393 int err; 394 395 smi_info->curr_msg = smi_info->waiting_msg; 396 smi_info->waiting_msg = NULL; 397 debug_timestamp("Start2"); 398 err = atomic_notifier_call_chain(&xaction_notifier_list, 399 0, smi_info); 400 if (err & NOTIFY_STOP_MASK) { 401 rv = SI_SM_CALL_WITHOUT_DELAY; 402 goto out; 403 } 404 err = smi_info->handlers->start_transaction( 405 smi_info->si_sm, 406 smi_info->curr_msg->data, 407 smi_info->curr_msg->data_size); 408 if (err) 409 return_hosed_msg(smi_info, err); 410 411 rv = SI_SM_CALL_WITHOUT_DELAY; 412 } 413 out: 414 return rv; 415 } 416 417 static void smi_mod_timer(struct smi_info *smi_info, unsigned long new_val) 418 { 419 smi_info->last_timeout_jiffies = jiffies; 420 mod_timer(&smi_info->si_timer, new_val); 421 smi_info->timer_running = true; 422 } 423 424 /* 425 * Start a new message and (re)start the timer and thread. 426 */ 427 static void start_new_msg(struct smi_info *smi_info, unsigned char *msg, 428 unsigned int size) 429 { 430 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); 431 432 if (smi_info->thread) 433 wake_up_process(smi_info->thread); 434 435 smi_info->handlers->start_transaction(smi_info->si_sm, msg, size); 436 } 437 438 static void start_check_enables(struct smi_info *smi_info, bool start_timer) 439 { 440 unsigned char msg[2]; 441 442 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 443 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; 444 445 if (start_timer) 446 start_new_msg(smi_info, msg, 2); 447 else 448 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); 449 smi_info->si_state = SI_CHECKING_ENABLES; 450 } 451 452 static void start_clear_flags(struct smi_info *smi_info, bool start_timer) 453 { 454 unsigned char msg[3]; 455 456 /* Make sure the watchdog pre-timeout flag is not set at startup. */ 457 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 458 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; 459 msg[2] = WDT_PRE_TIMEOUT_INT; 460 461 if (start_timer) 462 start_new_msg(smi_info, msg, 3); 463 else 464 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); 465 smi_info->si_state = SI_CLEARING_FLAGS; 466 } 467 468 static void start_getting_msg_queue(struct smi_info *smi_info) 469 { 470 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); 471 smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD; 472 smi_info->curr_msg->data_size = 2; 473 474 start_new_msg(smi_info, smi_info->curr_msg->data, 475 smi_info->curr_msg->data_size); 476 smi_info->si_state = SI_GETTING_MESSAGES; 477 } 478 479 static void start_getting_events(struct smi_info *smi_info) 480 { 481 smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); 482 smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; 483 smi_info->curr_msg->data_size = 2; 484 485 start_new_msg(smi_info, smi_info->curr_msg->data, 486 smi_info->curr_msg->data_size); 487 smi_info->si_state = SI_GETTING_EVENTS; 488 } 489 490 /* 491 * When we have a situtaion where we run out of memory and cannot 492 * allocate messages, we just leave them in the BMC and run the system 493 * polled until we can allocate some memory. Once we have some 494 * memory, we will re-enable the interrupt. 495 * 496 * Note that we cannot just use disable_irq(), since the interrupt may 497 * be shared. 498 */ 499 static inline bool disable_si_irq(struct smi_info *smi_info, bool start_timer) 500 { 501 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) { 502 smi_info->interrupt_disabled = true; 503 start_check_enables(smi_info, start_timer); 504 return true; 505 } 506 return false; 507 } 508 509 static inline bool enable_si_irq(struct smi_info *smi_info) 510 { 511 if ((smi_info->irq) && (smi_info->interrupt_disabled)) { 512 smi_info->interrupt_disabled = false; 513 start_check_enables(smi_info, true); 514 return true; 515 } 516 return false; 517 } 518 519 /* 520 * Allocate a message. If unable to allocate, start the interrupt 521 * disable process and return NULL. If able to allocate but 522 * interrupts are disabled, free the message and return NULL after 523 * starting the interrupt enable process. 524 */ 525 static struct ipmi_smi_msg *alloc_msg_handle_irq(struct smi_info *smi_info) 526 { 527 struct ipmi_smi_msg *msg; 528 529 msg = ipmi_alloc_smi_msg(); 530 if (!msg) { 531 if (!disable_si_irq(smi_info, true)) 532 smi_info->si_state = SI_NORMAL; 533 } else if (enable_si_irq(smi_info)) { 534 ipmi_free_smi_msg(msg); 535 msg = NULL; 536 } 537 return msg; 538 } 539 540 static void handle_flags(struct smi_info *smi_info) 541 { 542 retry: 543 if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) { 544 /* Watchdog pre-timeout */ 545 smi_inc_stat(smi_info, watchdog_pretimeouts); 546 547 start_clear_flags(smi_info, true); 548 smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; 549 if (smi_info->intf) 550 ipmi_smi_watchdog_pretimeout(smi_info->intf); 551 } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) { 552 /* Messages available. */ 553 smi_info->curr_msg = alloc_msg_handle_irq(smi_info); 554 if (!smi_info->curr_msg) 555 return; 556 557 start_getting_msg_queue(smi_info); 558 } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) { 559 /* Events available. */ 560 smi_info->curr_msg = alloc_msg_handle_irq(smi_info); 561 if (!smi_info->curr_msg) 562 return; 563 564 start_getting_events(smi_info); 565 } else if (smi_info->msg_flags & OEM_DATA_AVAIL && 566 smi_info->oem_data_avail_handler) { 567 if (smi_info->oem_data_avail_handler(smi_info)) 568 goto retry; 569 } else 570 smi_info->si_state = SI_NORMAL; 571 } 572 573 /* 574 * Global enables we care about. 575 */ 576 #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \ 577 IPMI_BMC_EVT_MSG_INTR) 578 579 static u8 current_global_enables(struct smi_info *smi_info, u8 base, 580 bool *irq_on) 581 { 582 u8 enables = 0; 583 584 if (smi_info->supports_event_msg_buff) 585 enables |= IPMI_BMC_EVT_MSG_BUFF; 586 587 if (((smi_info->irq && !smi_info->interrupt_disabled) || 588 smi_info->cannot_disable_irq) && 589 !smi_info->irq_enable_broken) 590 enables |= IPMI_BMC_RCV_MSG_INTR; 591 592 if (smi_info->supports_event_msg_buff && 593 smi_info->irq && !smi_info->interrupt_disabled && 594 !smi_info->irq_enable_broken) 595 enables |= IPMI_BMC_EVT_MSG_INTR; 596 597 *irq_on = enables & (IPMI_BMC_EVT_MSG_INTR | IPMI_BMC_RCV_MSG_INTR); 598 599 return enables; 600 } 601 602 static void check_bt_irq(struct smi_info *smi_info, bool irq_on) 603 { 604 u8 irqstate = smi_info->io.inputb(&smi_info->io, IPMI_BT_INTMASK_REG); 605 606 irqstate &= IPMI_BT_INTMASK_ENABLE_IRQ_BIT; 607 608 if ((bool)irqstate == irq_on) 609 return; 610 611 if (irq_on) 612 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 613 IPMI_BT_INTMASK_ENABLE_IRQ_BIT); 614 else 615 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 0); 616 } 617 618 static void handle_transaction_done(struct smi_info *smi_info) 619 { 620 struct ipmi_smi_msg *msg; 621 622 debug_timestamp("Done"); 623 switch (smi_info->si_state) { 624 case SI_NORMAL: 625 if (!smi_info->curr_msg) 626 break; 627 628 smi_info->curr_msg->rsp_size 629 = smi_info->handlers->get_result( 630 smi_info->si_sm, 631 smi_info->curr_msg->rsp, 632 IPMI_MAX_MSG_LENGTH); 633 634 /* 635 * Do this here becase deliver_recv_msg() releases the 636 * lock, and a new message can be put in during the 637 * time the lock is released. 638 */ 639 msg = smi_info->curr_msg; 640 smi_info->curr_msg = NULL; 641 deliver_recv_msg(smi_info, msg); 642 break; 643 644 case SI_GETTING_FLAGS: 645 { 646 unsigned char msg[4]; 647 unsigned int len; 648 649 /* We got the flags from the SMI, now handle them. */ 650 len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4); 651 if (msg[2] != 0) { 652 /* Error fetching flags, just give up for now. */ 653 smi_info->si_state = SI_NORMAL; 654 } else if (len < 4) { 655 /* 656 * Hmm, no flags. That's technically illegal, but 657 * don't use uninitialized data. 658 */ 659 smi_info->si_state = SI_NORMAL; 660 } else { 661 smi_info->msg_flags = msg[3]; 662 handle_flags(smi_info); 663 } 664 break; 665 } 666 667 case SI_CLEARING_FLAGS: 668 { 669 unsigned char msg[3]; 670 671 /* We cleared the flags. */ 672 smi_info->handlers->get_result(smi_info->si_sm, msg, 3); 673 if (msg[2] != 0) { 674 /* Error clearing flags */ 675 dev_warn(smi_info->dev, 676 "Error clearing flags: %2.2x\n", msg[2]); 677 } 678 smi_info->si_state = SI_NORMAL; 679 break; 680 } 681 682 case SI_GETTING_EVENTS: 683 { 684 smi_info->curr_msg->rsp_size 685 = smi_info->handlers->get_result( 686 smi_info->si_sm, 687 smi_info->curr_msg->rsp, 688 IPMI_MAX_MSG_LENGTH); 689 690 /* 691 * Do this here becase deliver_recv_msg() releases the 692 * lock, and a new message can be put in during the 693 * time the lock is released. 694 */ 695 msg = smi_info->curr_msg; 696 smi_info->curr_msg = NULL; 697 if (msg->rsp[2] != 0) { 698 /* Error getting event, probably done. */ 699 msg->done(msg); 700 701 /* Take off the event flag. */ 702 smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; 703 handle_flags(smi_info); 704 } else { 705 smi_inc_stat(smi_info, events); 706 707 /* 708 * Do this before we deliver the message 709 * because delivering the message releases the 710 * lock and something else can mess with the 711 * state. 712 */ 713 handle_flags(smi_info); 714 715 deliver_recv_msg(smi_info, msg); 716 } 717 break; 718 } 719 720 case SI_GETTING_MESSAGES: 721 { 722 smi_info->curr_msg->rsp_size 723 = smi_info->handlers->get_result( 724 smi_info->si_sm, 725 smi_info->curr_msg->rsp, 726 IPMI_MAX_MSG_LENGTH); 727 728 /* 729 * Do this here becase deliver_recv_msg() releases the 730 * lock, and a new message can be put in during the 731 * time the lock is released. 732 */ 733 msg = smi_info->curr_msg; 734 smi_info->curr_msg = NULL; 735 if (msg->rsp[2] != 0) { 736 /* Error getting event, probably done. */ 737 msg->done(msg); 738 739 /* Take off the msg flag. */ 740 smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL; 741 handle_flags(smi_info); 742 } else { 743 smi_inc_stat(smi_info, incoming_messages); 744 745 /* 746 * Do this before we deliver the message 747 * because delivering the message releases the 748 * lock and something else can mess with the 749 * state. 750 */ 751 handle_flags(smi_info); 752 753 deliver_recv_msg(smi_info, msg); 754 } 755 break; 756 } 757 758 case SI_CHECKING_ENABLES: 759 { 760 unsigned char msg[4]; 761 u8 enables; 762 bool irq_on; 763 764 /* We got the flags from the SMI, now handle them. */ 765 smi_info->handlers->get_result(smi_info->si_sm, msg, 4); 766 if (msg[2] != 0) { 767 dev_warn(smi_info->dev, 768 "Couldn't get irq info: %x.\n", msg[2]); 769 dev_warn(smi_info->dev, 770 "Maybe ok, but ipmi might run very slowly.\n"); 771 smi_info->si_state = SI_NORMAL; 772 break; 773 } 774 enables = current_global_enables(smi_info, 0, &irq_on); 775 if (smi_info->si_type == SI_BT) 776 /* BT has its own interrupt enable bit. */ 777 check_bt_irq(smi_info, irq_on); 778 if (enables != (msg[3] & GLOBAL_ENABLES_MASK)) { 779 /* Enables are not correct, fix them. */ 780 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 781 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; 782 msg[2] = enables | (msg[3] & ~GLOBAL_ENABLES_MASK); 783 smi_info->handlers->start_transaction( 784 smi_info->si_sm, msg, 3); 785 smi_info->si_state = SI_SETTING_ENABLES; 786 } else if (smi_info->supports_event_msg_buff) { 787 smi_info->curr_msg = ipmi_alloc_smi_msg(); 788 if (!smi_info->curr_msg) { 789 smi_info->si_state = SI_NORMAL; 790 break; 791 } 792 start_getting_msg_queue(smi_info); 793 } else { 794 smi_info->si_state = SI_NORMAL; 795 } 796 break; 797 } 798 799 case SI_SETTING_ENABLES: 800 { 801 unsigned char msg[4]; 802 803 smi_info->handlers->get_result(smi_info->si_sm, msg, 4); 804 if (msg[2] != 0) 805 dev_warn(smi_info->dev, 806 "Could not set the global enables: 0x%x.\n", 807 msg[2]); 808 809 if (smi_info->supports_event_msg_buff) { 810 smi_info->curr_msg = ipmi_alloc_smi_msg(); 811 if (!smi_info->curr_msg) { 812 smi_info->si_state = SI_NORMAL; 813 break; 814 } 815 start_getting_msg_queue(smi_info); 816 } else { 817 smi_info->si_state = SI_NORMAL; 818 } 819 break; 820 } 821 } 822 } 823 824 /* 825 * Called on timeouts and events. Timeouts should pass the elapsed 826 * time, interrupts should pass in zero. Must be called with 827 * si_lock held and interrupts disabled. 828 */ 829 static enum si_sm_result smi_event_handler(struct smi_info *smi_info, 830 int time) 831 { 832 enum si_sm_result si_sm_result; 833 834 restart: 835 /* 836 * There used to be a loop here that waited a little while 837 * (around 25us) before giving up. That turned out to be 838 * pointless, the minimum delays I was seeing were in the 300us 839 * range, which is far too long to wait in an interrupt. So 840 * we just run until the state machine tells us something 841 * happened or it needs a delay. 842 */ 843 si_sm_result = smi_info->handlers->event(smi_info->si_sm, time); 844 time = 0; 845 while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY) 846 si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); 847 848 if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) { 849 smi_inc_stat(smi_info, complete_transactions); 850 851 handle_transaction_done(smi_info); 852 goto restart; 853 } else if (si_sm_result == SI_SM_HOSED) { 854 smi_inc_stat(smi_info, hosed_count); 855 856 /* 857 * Do the before return_hosed_msg, because that 858 * releases the lock. 859 */ 860 smi_info->si_state = SI_NORMAL; 861 if (smi_info->curr_msg != NULL) { 862 /* 863 * If we were handling a user message, format 864 * a response to send to the upper layer to 865 * tell it about the error. 866 */ 867 return_hosed_msg(smi_info, IPMI_ERR_UNSPECIFIED); 868 } 869 goto restart; 870 } 871 872 /* 873 * We prefer handling attn over new messages. But don't do 874 * this if there is not yet an upper layer to handle anything. 875 */ 876 if (likely(smi_info->intf) && 877 (si_sm_result == SI_SM_ATTN || smi_info->got_attn)) { 878 unsigned char msg[2]; 879 880 if (smi_info->si_state != SI_NORMAL) { 881 /* 882 * We got an ATTN, but we are doing something else. 883 * Handle the ATTN later. 884 */ 885 smi_info->got_attn = true; 886 } else { 887 smi_info->got_attn = false; 888 smi_inc_stat(smi_info, attentions); 889 890 /* 891 * Got a attn, send down a get message flags to see 892 * what's causing it. It would be better to handle 893 * this in the upper layer, but due to the way 894 * interrupts work with the SMI, that's not really 895 * possible. 896 */ 897 msg[0] = (IPMI_NETFN_APP_REQUEST << 2); 898 msg[1] = IPMI_GET_MSG_FLAGS_CMD; 899 900 start_new_msg(smi_info, msg, 2); 901 smi_info->si_state = SI_GETTING_FLAGS; 902 goto restart; 903 } 904 } 905 906 /* If we are currently idle, try to start the next message. */ 907 if (si_sm_result == SI_SM_IDLE) { 908 smi_inc_stat(smi_info, idles); 909 910 si_sm_result = start_next_msg(smi_info); 911 if (si_sm_result != SI_SM_IDLE) 912 goto restart; 913 } 914 915 if ((si_sm_result == SI_SM_IDLE) 916 && (atomic_read(&smi_info->req_events))) { 917 /* 918 * We are idle and the upper layer requested that I fetch 919 * events, so do so. 920 */ 921 atomic_set(&smi_info->req_events, 0); 922 923 /* 924 * Take this opportunity to check the interrupt and 925 * message enable state for the BMC. The BMC can be 926 * asynchronously reset, and may thus get interrupts 927 * disable and messages disabled. 928 */ 929 if (smi_info->supports_event_msg_buff || smi_info->irq) { 930 start_check_enables(smi_info, true); 931 } else { 932 smi_info->curr_msg = alloc_msg_handle_irq(smi_info); 933 if (!smi_info->curr_msg) 934 goto out; 935 936 start_getting_events(smi_info); 937 } 938 goto restart; 939 } 940 941 if (si_sm_result == SI_SM_IDLE && smi_info->timer_running) { 942 /* Ok it if fails, the timer will just go off. */ 943 if (del_timer(&smi_info->si_timer)) 944 smi_info->timer_running = false; 945 } 946 947 out: 948 return si_sm_result; 949 } 950 951 static void check_start_timer_thread(struct smi_info *smi_info) 952 { 953 if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) { 954 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); 955 956 if (smi_info->thread) 957 wake_up_process(smi_info->thread); 958 959 start_next_msg(smi_info); 960 smi_event_handler(smi_info, 0); 961 } 962 } 963 964 static void flush_messages(void *send_info) 965 { 966 struct smi_info *smi_info = send_info; 967 enum si_sm_result result; 968 969 /* 970 * Currently, this function is called only in run-to-completion 971 * mode. This means we are single-threaded, no need for locks. 972 */ 973 result = smi_event_handler(smi_info, 0); 974 while (result != SI_SM_IDLE) { 975 udelay(SI_SHORT_TIMEOUT_USEC); 976 result = smi_event_handler(smi_info, SI_SHORT_TIMEOUT_USEC); 977 } 978 } 979 980 static void sender(void *send_info, 981 struct ipmi_smi_msg *msg) 982 { 983 struct smi_info *smi_info = send_info; 984 unsigned long flags; 985 986 debug_timestamp("Enqueue"); 987 988 if (smi_info->run_to_completion) { 989 /* 990 * If we are running to completion, start it. Upper 991 * layer will call flush_messages to clear it out. 992 */ 993 smi_info->waiting_msg = msg; 994 return; 995 } 996 997 spin_lock_irqsave(&smi_info->si_lock, flags); 998 /* 999 * The following two lines don't need to be under the lock for 1000 * the lock's sake, but they do need SMP memory barriers to 1001 * avoid getting things out of order. We are already claiming 1002 * the lock, anyway, so just do it under the lock to avoid the 1003 * ordering problem. 1004 */ 1005 BUG_ON(smi_info->waiting_msg); 1006 smi_info->waiting_msg = msg; 1007 check_start_timer_thread(smi_info); 1008 spin_unlock_irqrestore(&smi_info->si_lock, flags); 1009 } 1010 1011 static void set_run_to_completion(void *send_info, bool i_run_to_completion) 1012 { 1013 struct smi_info *smi_info = send_info; 1014 1015 smi_info->run_to_completion = i_run_to_completion; 1016 if (i_run_to_completion) 1017 flush_messages(smi_info); 1018 } 1019 1020 /* 1021 * Use -1 in the nsec value of the busy waiting timespec to tell that 1022 * we are spinning in kipmid looking for something and not delaying 1023 * between checks 1024 */ 1025 static inline void ipmi_si_set_not_busy(struct timespec64 *ts) 1026 { 1027 ts->tv_nsec = -1; 1028 } 1029 static inline int ipmi_si_is_busy(struct timespec64 *ts) 1030 { 1031 return ts->tv_nsec != -1; 1032 } 1033 1034 static inline int ipmi_thread_busy_wait(enum si_sm_result smi_result, 1035 const struct smi_info *smi_info, 1036 struct timespec64 *busy_until) 1037 { 1038 unsigned int max_busy_us = 0; 1039 1040 if (smi_info->intf_num < num_max_busy_us) 1041 max_busy_us = kipmid_max_busy_us[smi_info->intf_num]; 1042 if (max_busy_us == 0 || smi_result != SI_SM_CALL_WITH_DELAY) 1043 ipmi_si_set_not_busy(busy_until); 1044 else if (!ipmi_si_is_busy(busy_until)) { 1045 getnstimeofday64(busy_until); 1046 timespec64_add_ns(busy_until, max_busy_us*NSEC_PER_USEC); 1047 } else { 1048 struct timespec64 now; 1049 1050 getnstimeofday64(&now); 1051 if (unlikely(timespec64_compare(&now, busy_until) > 0)) { 1052 ipmi_si_set_not_busy(busy_until); 1053 return 0; 1054 } 1055 } 1056 return 1; 1057 } 1058 1059 1060 /* 1061 * A busy-waiting loop for speeding up IPMI operation. 1062 * 1063 * Lousy hardware makes this hard. This is only enabled for systems 1064 * that are not BT and do not have interrupts. It starts spinning 1065 * when an operation is complete or until max_busy tells it to stop 1066 * (if that is enabled). See the paragraph on kimid_max_busy_us in 1067 * Documentation/IPMI.txt for details. 1068 */ 1069 static int ipmi_thread(void *data) 1070 { 1071 struct smi_info *smi_info = data; 1072 unsigned long flags; 1073 enum si_sm_result smi_result; 1074 struct timespec64 busy_until; 1075 1076 ipmi_si_set_not_busy(&busy_until); 1077 set_user_nice(current, MAX_NICE); 1078 while (!kthread_should_stop()) { 1079 int busy_wait; 1080 1081 spin_lock_irqsave(&(smi_info->si_lock), flags); 1082 smi_result = smi_event_handler(smi_info, 0); 1083 1084 /* 1085 * If the driver is doing something, there is a possible 1086 * race with the timer. If the timer handler see idle, 1087 * and the thread here sees something else, the timer 1088 * handler won't restart the timer even though it is 1089 * required. So start it here if necessary. 1090 */ 1091 if (smi_result != SI_SM_IDLE && !smi_info->timer_running) 1092 smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_JIFFIES); 1093 1094 spin_unlock_irqrestore(&(smi_info->si_lock), flags); 1095 busy_wait = ipmi_thread_busy_wait(smi_result, smi_info, 1096 &busy_until); 1097 if (smi_result == SI_SM_CALL_WITHOUT_DELAY) 1098 ; /* do nothing */ 1099 else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait) 1100 schedule(); 1101 else if (smi_result == SI_SM_IDLE) { 1102 if (atomic_read(&smi_info->need_watch)) { 1103 schedule_timeout_interruptible(100); 1104 } else { 1105 /* Wait to be woken up when we are needed. */ 1106 __set_current_state(TASK_INTERRUPTIBLE); 1107 schedule(); 1108 } 1109 } else 1110 schedule_timeout_interruptible(1); 1111 } 1112 return 0; 1113 } 1114 1115 1116 static void poll(void *send_info) 1117 { 1118 struct smi_info *smi_info = send_info; 1119 unsigned long flags = 0; 1120 bool run_to_completion = smi_info->run_to_completion; 1121 1122 /* 1123 * Make sure there is some delay in the poll loop so we can 1124 * drive time forward and timeout things. 1125 */ 1126 udelay(10); 1127 if (!run_to_completion) 1128 spin_lock_irqsave(&smi_info->si_lock, flags); 1129 smi_event_handler(smi_info, 10); 1130 if (!run_to_completion) 1131 spin_unlock_irqrestore(&smi_info->si_lock, flags); 1132 } 1133 1134 static void request_events(void *send_info) 1135 { 1136 struct smi_info *smi_info = send_info; 1137 1138 if (!smi_info->has_event_buffer) 1139 return; 1140 1141 atomic_set(&smi_info->req_events, 1); 1142 } 1143 1144 static void set_need_watch(void *send_info, bool enable) 1145 { 1146 struct smi_info *smi_info = send_info; 1147 unsigned long flags; 1148 1149 atomic_set(&smi_info->need_watch, enable); 1150 spin_lock_irqsave(&smi_info->si_lock, flags); 1151 check_start_timer_thread(smi_info); 1152 spin_unlock_irqrestore(&smi_info->si_lock, flags); 1153 } 1154 1155 static int initialized; 1156 1157 static void smi_timeout(unsigned long data) 1158 { 1159 struct smi_info *smi_info = (struct smi_info *) data; 1160 enum si_sm_result smi_result; 1161 unsigned long flags; 1162 unsigned long jiffies_now; 1163 long time_diff; 1164 long timeout; 1165 1166 spin_lock_irqsave(&(smi_info->si_lock), flags); 1167 debug_timestamp("Timer"); 1168 1169 jiffies_now = jiffies; 1170 time_diff = (((long)jiffies_now - (long)smi_info->last_timeout_jiffies) 1171 * SI_USEC_PER_JIFFY); 1172 smi_result = smi_event_handler(smi_info, time_diff); 1173 1174 if ((smi_info->irq) && (!smi_info->interrupt_disabled)) { 1175 /* Running with interrupts, only do long timeouts. */ 1176 timeout = jiffies + SI_TIMEOUT_JIFFIES; 1177 smi_inc_stat(smi_info, long_timeouts); 1178 goto do_mod_timer; 1179 } 1180 1181 /* 1182 * If the state machine asks for a short delay, then shorten 1183 * the timer timeout. 1184 */ 1185 if (smi_result == SI_SM_CALL_WITH_DELAY) { 1186 smi_inc_stat(smi_info, short_timeouts); 1187 timeout = jiffies + 1; 1188 } else { 1189 smi_inc_stat(smi_info, long_timeouts); 1190 timeout = jiffies + SI_TIMEOUT_JIFFIES; 1191 } 1192 1193 do_mod_timer: 1194 if (smi_result != SI_SM_IDLE) 1195 smi_mod_timer(smi_info, timeout); 1196 else 1197 smi_info->timer_running = false; 1198 spin_unlock_irqrestore(&(smi_info->si_lock), flags); 1199 } 1200 1201 static irqreturn_t si_irq_handler(int irq, void *data) 1202 { 1203 struct smi_info *smi_info = data; 1204 unsigned long flags; 1205 1206 spin_lock_irqsave(&(smi_info->si_lock), flags); 1207 1208 smi_inc_stat(smi_info, interrupts); 1209 1210 debug_timestamp("Interrupt"); 1211 1212 smi_event_handler(smi_info, 0); 1213 spin_unlock_irqrestore(&(smi_info->si_lock), flags); 1214 return IRQ_HANDLED; 1215 } 1216 1217 static irqreturn_t si_bt_irq_handler(int irq, void *data) 1218 { 1219 struct smi_info *smi_info = data; 1220 /* We need to clear the IRQ flag for the BT interface. */ 1221 smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG, 1222 IPMI_BT_INTMASK_CLEAR_IRQ_BIT 1223 | IPMI_BT_INTMASK_ENABLE_IRQ_BIT); 1224 return si_irq_handler(irq, data); 1225 } 1226 1227 static int smi_start_processing(void *send_info, 1228 ipmi_smi_t intf) 1229 { 1230 struct smi_info *new_smi = send_info; 1231 int enable = 0; 1232 1233 new_smi->intf = intf; 1234 1235 /* Set up the timer that drives the interface. */ 1236 setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi); 1237 smi_mod_timer(new_smi, jiffies + SI_TIMEOUT_JIFFIES); 1238 1239 /* Try to claim any interrupts. */ 1240 if (new_smi->irq_setup) 1241 new_smi->irq_setup(new_smi); 1242 1243 /* 1244 * Check if the user forcefully enabled the daemon. 1245 */ 1246 if (new_smi->intf_num < num_force_kipmid) 1247 enable = force_kipmid[new_smi->intf_num]; 1248 /* 1249 * The BT interface is efficient enough to not need a thread, 1250 * and there is no need for a thread if we have interrupts. 1251 */ 1252 else if ((new_smi->si_type != SI_BT) && (!new_smi->irq)) 1253 enable = 1; 1254 1255 if (enable) { 1256 new_smi->thread = kthread_run(ipmi_thread, new_smi, 1257 "kipmi%d", new_smi->intf_num); 1258 if (IS_ERR(new_smi->thread)) { 1259 dev_notice(new_smi->dev, "Could not start" 1260 " kernel thread due to error %ld, only using" 1261 " timers to drive the interface\n", 1262 PTR_ERR(new_smi->thread)); 1263 new_smi->thread = NULL; 1264 } 1265 } 1266 1267 return 0; 1268 } 1269 1270 static int get_smi_info(void *send_info, struct ipmi_smi_info *data) 1271 { 1272 struct smi_info *smi = send_info; 1273 1274 data->addr_src = smi->addr_source; 1275 data->dev = smi->dev; 1276 data->addr_info = smi->addr_info; 1277 get_device(smi->dev); 1278 1279 return 0; 1280 } 1281 1282 static void set_maintenance_mode(void *send_info, bool enable) 1283 { 1284 struct smi_info *smi_info = send_info; 1285 1286 if (!enable) 1287 atomic_set(&smi_info->req_events, 0); 1288 } 1289 1290 static const struct ipmi_smi_handlers handlers = { 1291 .owner = THIS_MODULE, 1292 .start_processing = smi_start_processing, 1293 .get_smi_info = get_smi_info, 1294 .sender = sender, 1295 .request_events = request_events, 1296 .set_need_watch = set_need_watch, 1297 .set_maintenance_mode = set_maintenance_mode, 1298 .set_run_to_completion = set_run_to_completion, 1299 .flush_messages = flush_messages, 1300 .poll = poll, 1301 }; 1302 1303 /* 1304 * There can be 4 IO ports passed in (with or without IRQs), 4 addresses, 1305 * a default IO port, and 1 ACPI/SPMI address. That sets SI_MAX_DRIVERS. 1306 */ 1307 1308 static LIST_HEAD(smi_infos); 1309 static DEFINE_MUTEX(smi_infos_lock); 1310 static int smi_num; /* Used to sequence the SMIs */ 1311 1312 #define DEFAULT_REGSPACING 1 1313 #define DEFAULT_REGSIZE 1 1314 1315 #ifdef CONFIG_ACPI 1316 static bool si_tryacpi = true; 1317 #endif 1318 #ifdef CONFIG_DMI 1319 static bool si_trydmi = true; 1320 #endif 1321 static bool si_tryplatform = true; 1322 #ifdef CONFIG_PCI 1323 static bool si_trypci = true; 1324 #endif 1325 static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS); 1326 static char *si_type[SI_MAX_PARMS]; 1327 #define MAX_SI_TYPE_STR 30 1328 static char si_type_str[MAX_SI_TYPE_STR]; 1329 static unsigned long addrs[SI_MAX_PARMS]; 1330 static unsigned int num_addrs; 1331 static unsigned int ports[SI_MAX_PARMS]; 1332 static unsigned int num_ports; 1333 static int irqs[SI_MAX_PARMS]; 1334 static unsigned int num_irqs; 1335 static int regspacings[SI_MAX_PARMS]; 1336 static unsigned int num_regspacings; 1337 static int regsizes[SI_MAX_PARMS]; 1338 static unsigned int num_regsizes; 1339 static int regshifts[SI_MAX_PARMS]; 1340 static unsigned int num_regshifts; 1341 static int slave_addrs[SI_MAX_PARMS]; /* Leaving 0 chooses the default value */ 1342 static unsigned int num_slave_addrs; 1343 1344 #define IPMI_IO_ADDR_SPACE 0 1345 #define IPMI_MEM_ADDR_SPACE 1 1346 static const char * const addr_space_to_str[] = { "i/o", "mem" }; 1347 1348 static int hotmod_handler(const char *val, struct kernel_param *kp); 1349 1350 module_param_call(hotmod, hotmod_handler, NULL, NULL, 0200); 1351 MODULE_PARM_DESC(hotmod, "Add and remove interfaces. See" 1352 " Documentation/IPMI.txt in the kernel sources for the" 1353 " gory details."); 1354 1355 #ifdef CONFIG_ACPI 1356 module_param_named(tryacpi, si_tryacpi, bool, 0); 1357 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the" 1358 " default scan of the interfaces identified via ACPI"); 1359 #endif 1360 #ifdef CONFIG_DMI 1361 module_param_named(trydmi, si_trydmi, bool, 0); 1362 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the" 1363 " default scan of the interfaces identified via DMI"); 1364 #endif 1365 module_param_named(tryplatform, si_tryplatform, bool, 0); 1366 MODULE_PARM_DESC(tryplatform, "Setting this to zero will disable the" 1367 " default scan of the interfaces identified via platform" 1368 " interfaces like openfirmware"); 1369 #ifdef CONFIG_PCI 1370 module_param_named(trypci, si_trypci, bool, 0); 1371 MODULE_PARM_DESC(trypci, "Setting this to zero will disable the" 1372 " default scan of the interfaces identified via pci"); 1373 #endif 1374 module_param_named(trydefaults, si_trydefaults, bool, 0); 1375 MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the" 1376 " default scan of the KCS and SMIC interface at the standard" 1377 " address"); 1378 module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0); 1379 MODULE_PARM_DESC(type, "Defines the type of each interface, each" 1380 " interface separated by commas. The types are 'kcs'," 1381 " 'smic', and 'bt'. For example si_type=kcs,bt will set" 1382 " the first interface to kcs and the second to bt"); 1383 module_param_array(addrs, ulong, &num_addrs, 0); 1384 MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the" 1385 " addresses separated by commas. Only use if an interface" 1386 " is in memory. Otherwise, set it to zero or leave" 1387 " it blank."); 1388 module_param_array(ports, uint, &num_ports, 0); 1389 MODULE_PARM_DESC(ports, "Sets the port address of each interface, the" 1390 " addresses separated by commas. Only use if an interface" 1391 " is a port. Otherwise, set it to zero or leave" 1392 " it blank."); 1393 module_param_array(irqs, int, &num_irqs, 0); 1394 MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the" 1395 " addresses separated by commas. Only use if an interface" 1396 " has an interrupt. Otherwise, set it to zero or leave" 1397 " it blank."); 1398 module_param_array(regspacings, int, &num_regspacings, 0); 1399 MODULE_PARM_DESC(regspacings, "The number of bytes between the start address" 1400 " and each successive register used by the interface. For" 1401 " instance, if the start address is 0xca2 and the spacing" 1402 " is 2, then the second address is at 0xca4. Defaults" 1403 " to 1."); 1404 module_param_array(regsizes, int, &num_regsizes, 0); 1405 MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes." 1406 " This should generally be 1, 2, 4, or 8 for an 8-bit," 1407 " 16-bit, 32-bit, or 64-bit register. Use this if you" 1408 " the 8-bit IPMI register has to be read from a larger" 1409 " register."); 1410 module_param_array(regshifts, int, &num_regshifts, 0); 1411 MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the." 1412 " IPMI register, in bits. For instance, if the data" 1413 " is read from a 32-bit word and the IPMI data is in" 1414 " bit 8-15, then the shift would be 8"); 1415 module_param_array(slave_addrs, int, &num_slave_addrs, 0); 1416 MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for" 1417 " the controller. Normally this is 0x20, but can be" 1418 " overridden by this parm. This is an array indexed" 1419 " by interface number."); 1420 module_param_array(force_kipmid, int, &num_force_kipmid, 0); 1421 MODULE_PARM_DESC(force_kipmid, "Force the kipmi daemon to be enabled (1) or" 1422 " disabled(0). Normally the IPMI driver auto-detects" 1423 " this, but the value may be overridden by this parm."); 1424 module_param(unload_when_empty, bool, 0); 1425 MODULE_PARM_DESC(unload_when_empty, "Unload the module if no interfaces are" 1426 " specified or found, default is 1. Setting to 0" 1427 " is useful for hot add of devices using hotmod."); 1428 module_param_array(kipmid_max_busy_us, uint, &num_max_busy_us, 0644); 1429 MODULE_PARM_DESC(kipmid_max_busy_us, 1430 "Max time (in microseconds) to busy-wait for IPMI data before" 1431 " sleeping. 0 (default) means to wait forever. Set to 100-500" 1432 " if kipmid is using up a lot of CPU time."); 1433 1434 1435 static void std_irq_cleanup(struct smi_info *info) 1436 { 1437 if (info->si_type == SI_BT) 1438 /* Disable the interrupt in the BT interface. */ 1439 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 0); 1440 free_irq(info->irq, info); 1441 } 1442 1443 static int std_irq_setup(struct smi_info *info) 1444 { 1445 int rv; 1446 1447 if (!info->irq) 1448 return 0; 1449 1450 if (info->si_type == SI_BT) { 1451 rv = request_irq(info->irq, 1452 si_bt_irq_handler, 1453 IRQF_SHARED, 1454 DEVICE_NAME, 1455 info); 1456 if (!rv) 1457 /* Enable the interrupt in the BT interface. */ 1458 info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 1459 IPMI_BT_INTMASK_ENABLE_IRQ_BIT); 1460 } else 1461 rv = request_irq(info->irq, 1462 si_irq_handler, 1463 IRQF_SHARED, 1464 DEVICE_NAME, 1465 info); 1466 if (rv) { 1467 dev_warn(info->dev, "%s unable to claim interrupt %d," 1468 " running polled\n", 1469 DEVICE_NAME, info->irq); 1470 info->irq = 0; 1471 } else { 1472 info->irq_cleanup = std_irq_cleanup; 1473 dev_info(info->dev, "Using irq %d\n", info->irq); 1474 } 1475 1476 return rv; 1477 } 1478 1479 static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset) 1480 { 1481 unsigned int addr = io->addr_data; 1482 1483 return inb(addr + (offset * io->regspacing)); 1484 } 1485 1486 static void port_outb(const struct si_sm_io *io, unsigned int offset, 1487 unsigned char b) 1488 { 1489 unsigned int addr = io->addr_data; 1490 1491 outb(b, addr + (offset * io->regspacing)); 1492 } 1493 1494 static unsigned char port_inw(const struct si_sm_io *io, unsigned int offset) 1495 { 1496 unsigned int addr = io->addr_data; 1497 1498 return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff; 1499 } 1500 1501 static void port_outw(const struct si_sm_io *io, unsigned int offset, 1502 unsigned char b) 1503 { 1504 unsigned int addr = io->addr_data; 1505 1506 outw(b << io->regshift, addr + (offset * io->regspacing)); 1507 } 1508 1509 static unsigned char port_inl(const struct si_sm_io *io, unsigned int offset) 1510 { 1511 unsigned int addr = io->addr_data; 1512 1513 return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff; 1514 } 1515 1516 static void port_outl(const struct si_sm_io *io, unsigned int offset, 1517 unsigned char b) 1518 { 1519 unsigned int addr = io->addr_data; 1520 1521 outl(b << io->regshift, addr+(offset * io->regspacing)); 1522 } 1523 1524 static void port_cleanup(struct smi_info *info) 1525 { 1526 unsigned int addr = info->io.addr_data; 1527 int idx; 1528 1529 if (addr) { 1530 for (idx = 0; idx < info->io_size; idx++) 1531 release_region(addr + idx * info->io.regspacing, 1532 info->io.regsize); 1533 } 1534 } 1535 1536 static int port_setup(struct smi_info *info) 1537 { 1538 unsigned int addr = info->io.addr_data; 1539 int idx; 1540 1541 if (!addr) 1542 return -ENODEV; 1543 1544 info->io_cleanup = port_cleanup; 1545 1546 /* 1547 * Figure out the actual inb/inw/inl/etc routine to use based 1548 * upon the register size. 1549 */ 1550 switch (info->io.regsize) { 1551 case 1: 1552 info->io.inputb = port_inb; 1553 info->io.outputb = port_outb; 1554 break; 1555 case 2: 1556 info->io.inputb = port_inw; 1557 info->io.outputb = port_outw; 1558 break; 1559 case 4: 1560 info->io.inputb = port_inl; 1561 info->io.outputb = port_outl; 1562 break; 1563 default: 1564 dev_warn(info->dev, "Invalid register size: %d\n", 1565 info->io.regsize); 1566 return -EINVAL; 1567 } 1568 1569 /* 1570 * Some BIOSes reserve disjoint I/O regions in their ACPI 1571 * tables. This causes problems when trying to register the 1572 * entire I/O region. Therefore we must register each I/O 1573 * port separately. 1574 */ 1575 for (idx = 0; idx < info->io_size; idx++) { 1576 if (request_region(addr + idx * info->io.regspacing, 1577 info->io.regsize, DEVICE_NAME) == NULL) { 1578 /* Undo allocations */ 1579 while (idx--) { 1580 release_region(addr + idx * info->io.regspacing, 1581 info->io.regsize); 1582 } 1583 return -EIO; 1584 } 1585 } 1586 return 0; 1587 } 1588 1589 static unsigned char intf_mem_inb(const struct si_sm_io *io, 1590 unsigned int offset) 1591 { 1592 return readb((io->addr)+(offset * io->regspacing)); 1593 } 1594 1595 static void intf_mem_outb(const struct si_sm_io *io, unsigned int offset, 1596 unsigned char b) 1597 { 1598 writeb(b, (io->addr)+(offset * io->regspacing)); 1599 } 1600 1601 static unsigned char intf_mem_inw(const struct si_sm_io *io, 1602 unsigned int offset) 1603 { 1604 return (readw((io->addr)+(offset * io->regspacing)) >> io->regshift) 1605 & 0xff; 1606 } 1607 1608 static void intf_mem_outw(const struct si_sm_io *io, unsigned int offset, 1609 unsigned char b) 1610 { 1611 writeb(b << io->regshift, (io->addr)+(offset * io->regspacing)); 1612 } 1613 1614 static unsigned char intf_mem_inl(const struct si_sm_io *io, 1615 unsigned int offset) 1616 { 1617 return (readl((io->addr)+(offset * io->regspacing)) >> io->regshift) 1618 & 0xff; 1619 } 1620 1621 static void intf_mem_outl(const struct si_sm_io *io, unsigned int offset, 1622 unsigned char b) 1623 { 1624 writel(b << io->regshift, (io->addr)+(offset * io->regspacing)); 1625 } 1626 1627 #ifdef readq 1628 static unsigned char mem_inq(const struct si_sm_io *io, unsigned int offset) 1629 { 1630 return (readq((io->addr)+(offset * io->regspacing)) >> io->regshift) 1631 & 0xff; 1632 } 1633 1634 static void mem_outq(const struct si_sm_io *io, unsigned int offset, 1635 unsigned char b) 1636 { 1637 writeq(b << io->regshift, (io->addr)+(offset * io->regspacing)); 1638 } 1639 #endif 1640 1641 static void mem_cleanup(struct smi_info *info) 1642 { 1643 unsigned long addr = info->io.addr_data; 1644 int mapsize; 1645 1646 if (info->io.addr) { 1647 iounmap(info->io.addr); 1648 1649 mapsize = ((info->io_size * info->io.regspacing) 1650 - (info->io.regspacing - info->io.regsize)); 1651 1652 release_mem_region(addr, mapsize); 1653 } 1654 } 1655 1656 static int mem_setup(struct smi_info *info) 1657 { 1658 unsigned long addr = info->io.addr_data; 1659 int mapsize; 1660 1661 if (!addr) 1662 return -ENODEV; 1663 1664 info->io_cleanup = mem_cleanup; 1665 1666 /* 1667 * Figure out the actual readb/readw/readl/etc routine to use based 1668 * upon the register size. 1669 */ 1670 switch (info->io.regsize) { 1671 case 1: 1672 info->io.inputb = intf_mem_inb; 1673 info->io.outputb = intf_mem_outb; 1674 break; 1675 case 2: 1676 info->io.inputb = intf_mem_inw; 1677 info->io.outputb = intf_mem_outw; 1678 break; 1679 case 4: 1680 info->io.inputb = intf_mem_inl; 1681 info->io.outputb = intf_mem_outl; 1682 break; 1683 #ifdef readq 1684 case 8: 1685 info->io.inputb = mem_inq; 1686 info->io.outputb = mem_outq; 1687 break; 1688 #endif 1689 default: 1690 dev_warn(info->dev, "Invalid register size: %d\n", 1691 info->io.regsize); 1692 return -EINVAL; 1693 } 1694 1695 /* 1696 * Calculate the total amount of memory to claim. This is an 1697 * unusual looking calculation, but it avoids claiming any 1698 * more memory than it has to. It will claim everything 1699 * between the first address to the end of the last full 1700 * register. 1701 */ 1702 mapsize = ((info->io_size * info->io.regspacing) 1703 - (info->io.regspacing - info->io.regsize)); 1704 1705 if (request_mem_region(addr, mapsize, DEVICE_NAME) == NULL) 1706 return -EIO; 1707 1708 info->io.addr = ioremap(addr, mapsize); 1709 if (info->io.addr == NULL) { 1710 release_mem_region(addr, mapsize); 1711 return -EIO; 1712 } 1713 return 0; 1714 } 1715 1716 /* 1717 * Parms come in as <op1>[:op2[:op3...]]. ops are: 1718 * add|remove,kcs|bt|smic,mem|i/o,<address>[,<opt1>[,<opt2>[,...]]] 1719 * Options are: 1720 * rsp=<regspacing> 1721 * rsi=<regsize> 1722 * rsh=<regshift> 1723 * irq=<irq> 1724 * ipmb=<ipmb addr> 1725 */ 1726 enum hotmod_op { HM_ADD, HM_REMOVE }; 1727 struct hotmod_vals { 1728 const char *name; 1729 const int val; 1730 }; 1731 1732 static const struct hotmod_vals hotmod_ops[] = { 1733 { "add", HM_ADD }, 1734 { "remove", HM_REMOVE }, 1735 { NULL } 1736 }; 1737 1738 static const struct hotmod_vals hotmod_si[] = { 1739 { "kcs", SI_KCS }, 1740 { "smic", SI_SMIC }, 1741 { "bt", SI_BT }, 1742 { NULL } 1743 }; 1744 1745 static const struct hotmod_vals hotmod_as[] = { 1746 { "mem", IPMI_MEM_ADDR_SPACE }, 1747 { "i/o", IPMI_IO_ADDR_SPACE }, 1748 { NULL } 1749 }; 1750 1751 static int parse_str(const struct hotmod_vals *v, int *val, char *name, 1752 char **curr) 1753 { 1754 char *s; 1755 int i; 1756 1757 s = strchr(*curr, ','); 1758 if (!s) { 1759 printk(KERN_WARNING PFX "No hotmod %s given.\n", name); 1760 return -EINVAL; 1761 } 1762 *s = '\0'; 1763 s++; 1764 for (i = 0; v[i].name; i++) { 1765 if (strcmp(*curr, v[i].name) == 0) { 1766 *val = v[i].val; 1767 *curr = s; 1768 return 0; 1769 } 1770 } 1771 1772 printk(KERN_WARNING PFX "Invalid hotmod %s '%s'\n", name, *curr); 1773 return -EINVAL; 1774 } 1775 1776 static int check_hotmod_int_op(const char *curr, const char *option, 1777 const char *name, int *val) 1778 { 1779 char *n; 1780 1781 if (strcmp(curr, name) == 0) { 1782 if (!option) { 1783 printk(KERN_WARNING PFX 1784 "No option given for '%s'\n", 1785 curr); 1786 return -EINVAL; 1787 } 1788 *val = simple_strtoul(option, &n, 0); 1789 if ((*n != '\0') || (*option == '\0')) { 1790 printk(KERN_WARNING PFX 1791 "Bad option given for '%s'\n", 1792 curr); 1793 return -EINVAL; 1794 } 1795 return 1; 1796 } 1797 return 0; 1798 } 1799 1800 static struct smi_info *smi_info_alloc(void) 1801 { 1802 struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL); 1803 1804 if (info) 1805 spin_lock_init(&info->si_lock); 1806 return info; 1807 } 1808 1809 static int hotmod_handler(const char *val, struct kernel_param *kp) 1810 { 1811 char *str = kstrdup(val, GFP_KERNEL); 1812 int rv; 1813 char *next, *curr, *s, *n, *o; 1814 enum hotmod_op op; 1815 enum si_type si_type; 1816 int addr_space; 1817 unsigned long addr; 1818 int regspacing; 1819 int regsize; 1820 int regshift; 1821 int irq; 1822 int ipmb; 1823 int ival; 1824 int len; 1825 struct smi_info *info; 1826 1827 if (!str) 1828 return -ENOMEM; 1829 1830 /* Kill any trailing spaces, as we can get a "\n" from echo. */ 1831 len = strlen(str); 1832 ival = len - 1; 1833 while ((ival >= 0) && isspace(str[ival])) { 1834 str[ival] = '\0'; 1835 ival--; 1836 } 1837 1838 for (curr = str; curr; curr = next) { 1839 regspacing = 1; 1840 regsize = 1; 1841 regshift = 0; 1842 irq = 0; 1843 ipmb = 0; /* Choose the default if not specified */ 1844 1845 next = strchr(curr, ':'); 1846 if (next) { 1847 *next = '\0'; 1848 next++; 1849 } 1850 1851 rv = parse_str(hotmod_ops, &ival, "operation", &curr); 1852 if (rv) 1853 break; 1854 op = ival; 1855 1856 rv = parse_str(hotmod_si, &ival, "interface type", &curr); 1857 if (rv) 1858 break; 1859 si_type = ival; 1860 1861 rv = parse_str(hotmod_as, &addr_space, "address space", &curr); 1862 if (rv) 1863 break; 1864 1865 s = strchr(curr, ','); 1866 if (s) { 1867 *s = '\0'; 1868 s++; 1869 } 1870 addr = simple_strtoul(curr, &n, 0); 1871 if ((*n != '\0') || (*curr == '\0')) { 1872 printk(KERN_WARNING PFX "Invalid hotmod address" 1873 " '%s'\n", curr); 1874 break; 1875 } 1876 1877 while (s) { 1878 curr = s; 1879 s = strchr(curr, ','); 1880 if (s) { 1881 *s = '\0'; 1882 s++; 1883 } 1884 o = strchr(curr, '='); 1885 if (o) { 1886 *o = '\0'; 1887 o++; 1888 } 1889 rv = check_hotmod_int_op(curr, o, "rsp", ®spacing); 1890 if (rv < 0) 1891 goto out; 1892 else if (rv) 1893 continue; 1894 rv = check_hotmod_int_op(curr, o, "rsi", ®size); 1895 if (rv < 0) 1896 goto out; 1897 else if (rv) 1898 continue; 1899 rv = check_hotmod_int_op(curr, o, "rsh", ®shift); 1900 if (rv < 0) 1901 goto out; 1902 else if (rv) 1903 continue; 1904 rv = check_hotmod_int_op(curr, o, "irq", &irq); 1905 if (rv < 0) 1906 goto out; 1907 else if (rv) 1908 continue; 1909 rv = check_hotmod_int_op(curr, o, "ipmb", &ipmb); 1910 if (rv < 0) 1911 goto out; 1912 else if (rv) 1913 continue; 1914 1915 rv = -EINVAL; 1916 printk(KERN_WARNING PFX 1917 "Invalid hotmod option '%s'\n", 1918 curr); 1919 goto out; 1920 } 1921 1922 if (op == HM_ADD) { 1923 info = smi_info_alloc(); 1924 if (!info) { 1925 rv = -ENOMEM; 1926 goto out; 1927 } 1928 1929 info->addr_source = SI_HOTMOD; 1930 info->si_type = si_type; 1931 info->io.addr_data = addr; 1932 info->io.addr_type = addr_space; 1933 if (addr_space == IPMI_MEM_ADDR_SPACE) 1934 info->io_setup = mem_setup; 1935 else 1936 info->io_setup = port_setup; 1937 1938 info->io.addr = NULL; 1939 info->io.regspacing = regspacing; 1940 if (!info->io.regspacing) 1941 info->io.regspacing = DEFAULT_REGSPACING; 1942 info->io.regsize = regsize; 1943 if (!info->io.regsize) 1944 info->io.regsize = DEFAULT_REGSPACING; 1945 info->io.regshift = regshift; 1946 info->irq = irq; 1947 if (info->irq) 1948 info->irq_setup = std_irq_setup; 1949 info->slave_addr = ipmb; 1950 1951 rv = add_smi(info); 1952 if (rv) { 1953 kfree(info); 1954 goto out; 1955 } 1956 rv = try_smi_init(info); 1957 if (rv) { 1958 cleanup_one_si(info); 1959 goto out; 1960 } 1961 } else { 1962 /* remove */ 1963 struct smi_info *e, *tmp_e; 1964 1965 mutex_lock(&smi_infos_lock); 1966 list_for_each_entry_safe(e, tmp_e, &smi_infos, link) { 1967 if (e->io.addr_type != addr_space) 1968 continue; 1969 if (e->si_type != si_type) 1970 continue; 1971 if (e->io.addr_data == addr) 1972 cleanup_one_si(e); 1973 } 1974 mutex_unlock(&smi_infos_lock); 1975 } 1976 } 1977 rv = len; 1978 out: 1979 kfree(str); 1980 return rv; 1981 } 1982 1983 static int hardcode_find_bmc(void) 1984 { 1985 int ret = -ENODEV; 1986 int i; 1987 struct smi_info *info; 1988 1989 for (i = 0; i < SI_MAX_PARMS; i++) { 1990 if (!ports[i] && !addrs[i]) 1991 continue; 1992 1993 info = smi_info_alloc(); 1994 if (!info) 1995 return -ENOMEM; 1996 1997 info->addr_source = SI_HARDCODED; 1998 printk(KERN_INFO PFX "probing via hardcoded address\n"); 1999 2000 if (!si_type[i] || strcmp(si_type[i], "kcs") == 0) { 2001 info->si_type = SI_KCS; 2002 } else if (strcmp(si_type[i], "smic") == 0) { 2003 info->si_type = SI_SMIC; 2004 } else if (strcmp(si_type[i], "bt") == 0) { 2005 info->si_type = SI_BT; 2006 } else { 2007 printk(KERN_WARNING PFX "Interface type specified " 2008 "for interface %d, was invalid: %s\n", 2009 i, si_type[i]); 2010 kfree(info); 2011 continue; 2012 } 2013 2014 if (ports[i]) { 2015 /* An I/O port */ 2016 info->io_setup = port_setup; 2017 info->io.addr_data = ports[i]; 2018 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2019 } else if (addrs[i]) { 2020 /* A memory port */ 2021 info->io_setup = mem_setup; 2022 info->io.addr_data = addrs[i]; 2023 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2024 } else { 2025 printk(KERN_WARNING PFX "Interface type specified " 2026 "for interface %d, but port and address were " 2027 "not set or set to zero.\n", i); 2028 kfree(info); 2029 continue; 2030 } 2031 2032 info->io.addr = NULL; 2033 info->io.regspacing = regspacings[i]; 2034 if (!info->io.regspacing) 2035 info->io.regspacing = DEFAULT_REGSPACING; 2036 info->io.regsize = regsizes[i]; 2037 if (!info->io.regsize) 2038 info->io.regsize = DEFAULT_REGSPACING; 2039 info->io.regshift = regshifts[i]; 2040 info->irq = irqs[i]; 2041 if (info->irq) 2042 info->irq_setup = std_irq_setup; 2043 info->slave_addr = slave_addrs[i]; 2044 2045 if (!add_smi(info)) { 2046 if (try_smi_init(info)) 2047 cleanup_one_si(info); 2048 ret = 0; 2049 } else { 2050 kfree(info); 2051 } 2052 } 2053 return ret; 2054 } 2055 2056 #ifdef CONFIG_ACPI 2057 2058 /* 2059 * Once we get an ACPI failure, we don't try any more, because we go 2060 * through the tables sequentially. Once we don't find a table, there 2061 * are no more. 2062 */ 2063 static int acpi_failure; 2064 2065 /* For GPE-type interrupts. */ 2066 static u32 ipmi_acpi_gpe(acpi_handle gpe_device, 2067 u32 gpe_number, void *context) 2068 { 2069 struct smi_info *smi_info = context; 2070 unsigned long flags; 2071 2072 spin_lock_irqsave(&(smi_info->si_lock), flags); 2073 2074 smi_inc_stat(smi_info, interrupts); 2075 2076 debug_timestamp("ACPI_GPE"); 2077 2078 smi_event_handler(smi_info, 0); 2079 spin_unlock_irqrestore(&(smi_info->si_lock), flags); 2080 2081 return ACPI_INTERRUPT_HANDLED; 2082 } 2083 2084 static void acpi_gpe_irq_cleanup(struct smi_info *info) 2085 { 2086 if (!info->irq) 2087 return; 2088 2089 acpi_remove_gpe_handler(NULL, info->irq, &ipmi_acpi_gpe); 2090 } 2091 2092 static int acpi_gpe_irq_setup(struct smi_info *info) 2093 { 2094 acpi_status status; 2095 2096 if (!info->irq) 2097 return 0; 2098 2099 status = acpi_install_gpe_handler(NULL, 2100 info->irq, 2101 ACPI_GPE_LEVEL_TRIGGERED, 2102 &ipmi_acpi_gpe, 2103 info); 2104 if (status != AE_OK) { 2105 dev_warn(info->dev, "%s unable to claim ACPI GPE %d," 2106 " running polled\n", DEVICE_NAME, info->irq); 2107 info->irq = 0; 2108 return -EINVAL; 2109 } else { 2110 info->irq_cleanup = acpi_gpe_irq_cleanup; 2111 dev_info(info->dev, "Using ACPI GPE %d\n", info->irq); 2112 return 0; 2113 } 2114 } 2115 2116 /* 2117 * Defined at 2118 * http://h21007.www2.hp.com/portal/download/files/unprot/hpspmi.pdf 2119 */ 2120 struct SPMITable { 2121 s8 Signature[4]; 2122 u32 Length; 2123 u8 Revision; 2124 u8 Checksum; 2125 s8 OEMID[6]; 2126 s8 OEMTableID[8]; 2127 s8 OEMRevision[4]; 2128 s8 CreatorID[4]; 2129 s8 CreatorRevision[4]; 2130 u8 InterfaceType; 2131 u8 IPMIlegacy; 2132 s16 SpecificationRevision; 2133 2134 /* 2135 * Bit 0 - SCI interrupt supported 2136 * Bit 1 - I/O APIC/SAPIC 2137 */ 2138 u8 InterruptType; 2139 2140 /* 2141 * If bit 0 of InterruptType is set, then this is the SCI 2142 * interrupt in the GPEx_STS register. 2143 */ 2144 u8 GPE; 2145 2146 s16 Reserved; 2147 2148 /* 2149 * If bit 1 of InterruptType is set, then this is the I/O 2150 * APIC/SAPIC interrupt. 2151 */ 2152 u32 GlobalSystemInterrupt; 2153 2154 /* The actual register address. */ 2155 struct acpi_generic_address addr; 2156 2157 u8 UID[4]; 2158 2159 s8 spmi_id[1]; /* A '\0' terminated array starts here. */ 2160 }; 2161 2162 static int try_init_spmi(struct SPMITable *spmi) 2163 { 2164 struct smi_info *info; 2165 int rv; 2166 2167 if (spmi->IPMIlegacy != 1) { 2168 printk(KERN_INFO PFX "Bad SPMI legacy %d\n", spmi->IPMIlegacy); 2169 return -ENODEV; 2170 } 2171 2172 info = smi_info_alloc(); 2173 if (!info) { 2174 printk(KERN_ERR PFX "Could not allocate SI data (3)\n"); 2175 return -ENOMEM; 2176 } 2177 2178 info->addr_source = SI_SPMI; 2179 printk(KERN_INFO PFX "probing via SPMI\n"); 2180 2181 /* Figure out the interface type. */ 2182 switch (spmi->InterfaceType) { 2183 case 1: /* KCS */ 2184 info->si_type = SI_KCS; 2185 break; 2186 case 2: /* SMIC */ 2187 info->si_type = SI_SMIC; 2188 break; 2189 case 3: /* BT */ 2190 info->si_type = SI_BT; 2191 break; 2192 case 4: /* SSIF, just ignore */ 2193 kfree(info); 2194 return -EIO; 2195 default: 2196 printk(KERN_INFO PFX "Unknown ACPI/SPMI SI type %d\n", 2197 spmi->InterfaceType); 2198 kfree(info); 2199 return -EIO; 2200 } 2201 2202 if (spmi->InterruptType & 1) { 2203 /* We've got a GPE interrupt. */ 2204 info->irq = spmi->GPE; 2205 info->irq_setup = acpi_gpe_irq_setup; 2206 } else if (spmi->InterruptType & 2) { 2207 /* We've got an APIC/SAPIC interrupt. */ 2208 info->irq = spmi->GlobalSystemInterrupt; 2209 info->irq_setup = std_irq_setup; 2210 } else { 2211 /* Use the default interrupt setting. */ 2212 info->irq = 0; 2213 info->irq_setup = NULL; 2214 } 2215 2216 if (spmi->addr.bit_width) { 2217 /* A (hopefully) properly formed register bit width. */ 2218 info->io.regspacing = spmi->addr.bit_width / 8; 2219 } else { 2220 info->io.regspacing = DEFAULT_REGSPACING; 2221 } 2222 info->io.regsize = info->io.regspacing; 2223 info->io.regshift = spmi->addr.bit_offset; 2224 2225 if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { 2226 info->io_setup = mem_setup; 2227 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2228 } else if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_IO) { 2229 info->io_setup = port_setup; 2230 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2231 } else { 2232 kfree(info); 2233 printk(KERN_WARNING PFX "Unknown ACPI I/O Address type\n"); 2234 return -EIO; 2235 } 2236 info->io.addr_data = spmi->addr.address; 2237 2238 pr_info("ipmi_si: SPMI: %s %#lx regsize %d spacing %d irq %d\n", 2239 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem", 2240 info->io.addr_data, info->io.regsize, info->io.regspacing, 2241 info->irq); 2242 2243 rv = add_smi(info); 2244 if (rv) 2245 kfree(info); 2246 2247 return rv; 2248 } 2249 2250 static void spmi_find_bmc(void) 2251 { 2252 acpi_status status; 2253 struct SPMITable *spmi; 2254 int i; 2255 2256 if (acpi_disabled) 2257 return; 2258 2259 if (acpi_failure) 2260 return; 2261 2262 for (i = 0; ; i++) { 2263 status = acpi_get_table(ACPI_SIG_SPMI, i+1, 2264 (struct acpi_table_header **)&spmi); 2265 if (status != AE_OK) 2266 return; 2267 2268 try_init_spmi(spmi); 2269 } 2270 } 2271 #endif 2272 2273 #ifdef CONFIG_DMI 2274 struct dmi_ipmi_data { 2275 u8 type; 2276 u8 addr_space; 2277 unsigned long base_addr; 2278 u8 irq; 2279 u8 offset; 2280 u8 slave_addr; 2281 }; 2282 2283 static int decode_dmi(const struct dmi_header *dm, 2284 struct dmi_ipmi_data *dmi) 2285 { 2286 const u8 *data = (const u8 *)dm; 2287 unsigned long base_addr; 2288 u8 reg_spacing; 2289 u8 len = dm->length; 2290 2291 dmi->type = data[4]; 2292 2293 memcpy(&base_addr, data+8, sizeof(unsigned long)); 2294 if (len >= 0x11) { 2295 if (base_addr & 1) { 2296 /* I/O */ 2297 base_addr &= 0xFFFE; 2298 dmi->addr_space = IPMI_IO_ADDR_SPACE; 2299 } else 2300 /* Memory */ 2301 dmi->addr_space = IPMI_MEM_ADDR_SPACE; 2302 2303 /* If bit 4 of byte 0x10 is set, then the lsb for the address 2304 is odd. */ 2305 dmi->base_addr = base_addr | ((data[0x10] & 0x10) >> 4); 2306 2307 dmi->irq = data[0x11]; 2308 2309 /* The top two bits of byte 0x10 hold the register spacing. */ 2310 reg_spacing = (data[0x10] & 0xC0) >> 6; 2311 switch (reg_spacing) { 2312 case 0x00: /* Byte boundaries */ 2313 dmi->offset = 1; 2314 break; 2315 case 0x01: /* 32-bit boundaries */ 2316 dmi->offset = 4; 2317 break; 2318 case 0x02: /* 16-byte boundaries */ 2319 dmi->offset = 16; 2320 break; 2321 default: 2322 /* Some other interface, just ignore it. */ 2323 return -EIO; 2324 } 2325 } else { 2326 /* Old DMI spec. */ 2327 /* 2328 * Note that technically, the lower bit of the base 2329 * address should be 1 if the address is I/O and 0 if 2330 * the address is in memory. So many systems get that 2331 * wrong (and all that I have seen are I/O) so we just 2332 * ignore that bit and assume I/O. Systems that use 2333 * memory should use the newer spec, anyway. 2334 */ 2335 dmi->base_addr = base_addr & 0xfffe; 2336 dmi->addr_space = IPMI_IO_ADDR_SPACE; 2337 dmi->offset = 1; 2338 } 2339 2340 dmi->slave_addr = data[6]; 2341 2342 return 0; 2343 } 2344 2345 static void try_init_dmi(struct dmi_ipmi_data *ipmi_data) 2346 { 2347 struct smi_info *info; 2348 2349 info = smi_info_alloc(); 2350 if (!info) { 2351 printk(KERN_ERR PFX "Could not allocate SI data\n"); 2352 return; 2353 } 2354 2355 info->addr_source = SI_SMBIOS; 2356 printk(KERN_INFO PFX "probing via SMBIOS\n"); 2357 2358 switch (ipmi_data->type) { 2359 case 0x01: /* KCS */ 2360 info->si_type = SI_KCS; 2361 break; 2362 case 0x02: /* SMIC */ 2363 info->si_type = SI_SMIC; 2364 break; 2365 case 0x03: /* BT */ 2366 info->si_type = SI_BT; 2367 break; 2368 default: 2369 kfree(info); 2370 return; 2371 } 2372 2373 switch (ipmi_data->addr_space) { 2374 case IPMI_MEM_ADDR_SPACE: 2375 info->io_setup = mem_setup; 2376 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2377 break; 2378 2379 case IPMI_IO_ADDR_SPACE: 2380 info->io_setup = port_setup; 2381 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2382 break; 2383 2384 default: 2385 kfree(info); 2386 printk(KERN_WARNING PFX "Unknown SMBIOS I/O Address type: %d\n", 2387 ipmi_data->addr_space); 2388 return; 2389 } 2390 info->io.addr_data = ipmi_data->base_addr; 2391 2392 info->io.regspacing = ipmi_data->offset; 2393 if (!info->io.regspacing) 2394 info->io.regspacing = DEFAULT_REGSPACING; 2395 info->io.regsize = DEFAULT_REGSPACING; 2396 info->io.regshift = 0; 2397 2398 info->slave_addr = ipmi_data->slave_addr; 2399 2400 info->irq = ipmi_data->irq; 2401 if (info->irq) 2402 info->irq_setup = std_irq_setup; 2403 2404 pr_info("ipmi_si: SMBIOS: %s %#lx regsize %d spacing %d irq %d\n", 2405 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? "io" : "mem", 2406 info->io.addr_data, info->io.regsize, info->io.regspacing, 2407 info->irq); 2408 2409 if (add_smi(info)) 2410 kfree(info); 2411 } 2412 2413 static void dmi_find_bmc(void) 2414 { 2415 const struct dmi_device *dev = NULL; 2416 struct dmi_ipmi_data data; 2417 int rv; 2418 2419 while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev))) { 2420 memset(&data, 0, sizeof(data)); 2421 rv = decode_dmi((const struct dmi_header *) dev->device_data, 2422 &data); 2423 if (!rv) 2424 try_init_dmi(&data); 2425 } 2426 } 2427 #endif /* CONFIG_DMI */ 2428 2429 #ifdef CONFIG_PCI 2430 2431 #define PCI_ERMC_CLASSCODE 0x0C0700 2432 #define PCI_ERMC_CLASSCODE_MASK 0xffffff00 2433 #define PCI_ERMC_CLASSCODE_TYPE_MASK 0xff 2434 #define PCI_ERMC_CLASSCODE_TYPE_SMIC 0x00 2435 #define PCI_ERMC_CLASSCODE_TYPE_KCS 0x01 2436 #define PCI_ERMC_CLASSCODE_TYPE_BT 0x02 2437 2438 #define PCI_HP_VENDOR_ID 0x103C 2439 #define PCI_MMC_DEVICE_ID 0x121A 2440 #define PCI_MMC_ADDR_CW 0x10 2441 2442 static void ipmi_pci_cleanup(struct smi_info *info) 2443 { 2444 struct pci_dev *pdev = info->addr_source_data; 2445 2446 pci_disable_device(pdev); 2447 } 2448 2449 static int ipmi_pci_probe_regspacing(struct smi_info *info) 2450 { 2451 if (info->si_type == SI_KCS) { 2452 unsigned char status; 2453 int regspacing; 2454 2455 info->io.regsize = DEFAULT_REGSIZE; 2456 info->io.regshift = 0; 2457 info->io_size = 2; 2458 info->handlers = &kcs_smi_handlers; 2459 2460 /* detect 1, 4, 16byte spacing */ 2461 for (regspacing = DEFAULT_REGSPACING; regspacing <= 16;) { 2462 info->io.regspacing = regspacing; 2463 if (info->io_setup(info)) { 2464 dev_err(info->dev, 2465 "Could not setup I/O space\n"); 2466 return DEFAULT_REGSPACING; 2467 } 2468 /* write invalid cmd */ 2469 info->io.outputb(&info->io, 1, 0x10); 2470 /* read status back */ 2471 status = info->io.inputb(&info->io, 1); 2472 info->io_cleanup(info); 2473 if (status) 2474 return regspacing; 2475 regspacing *= 4; 2476 } 2477 } 2478 return DEFAULT_REGSPACING; 2479 } 2480 2481 static int ipmi_pci_probe(struct pci_dev *pdev, 2482 const struct pci_device_id *ent) 2483 { 2484 int rv; 2485 int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK; 2486 struct smi_info *info; 2487 2488 info = smi_info_alloc(); 2489 if (!info) 2490 return -ENOMEM; 2491 2492 info->addr_source = SI_PCI; 2493 dev_info(&pdev->dev, "probing via PCI"); 2494 2495 switch (class_type) { 2496 case PCI_ERMC_CLASSCODE_TYPE_SMIC: 2497 info->si_type = SI_SMIC; 2498 break; 2499 2500 case PCI_ERMC_CLASSCODE_TYPE_KCS: 2501 info->si_type = SI_KCS; 2502 break; 2503 2504 case PCI_ERMC_CLASSCODE_TYPE_BT: 2505 info->si_type = SI_BT; 2506 break; 2507 2508 default: 2509 kfree(info); 2510 dev_info(&pdev->dev, "Unknown IPMI type: %d\n", class_type); 2511 return -ENOMEM; 2512 } 2513 2514 rv = pci_enable_device(pdev); 2515 if (rv) { 2516 dev_err(&pdev->dev, "couldn't enable PCI device\n"); 2517 kfree(info); 2518 return rv; 2519 } 2520 2521 info->addr_source_cleanup = ipmi_pci_cleanup; 2522 info->addr_source_data = pdev; 2523 2524 if (pci_resource_flags(pdev, 0) & IORESOURCE_IO) { 2525 info->io_setup = port_setup; 2526 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2527 } else { 2528 info->io_setup = mem_setup; 2529 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2530 } 2531 info->io.addr_data = pci_resource_start(pdev, 0); 2532 2533 info->io.regspacing = ipmi_pci_probe_regspacing(info); 2534 info->io.regsize = DEFAULT_REGSIZE; 2535 info->io.regshift = 0; 2536 2537 info->irq = pdev->irq; 2538 if (info->irq) 2539 info->irq_setup = std_irq_setup; 2540 2541 info->dev = &pdev->dev; 2542 pci_set_drvdata(pdev, info); 2543 2544 dev_info(&pdev->dev, "%pR regsize %d spacing %d irq %d\n", 2545 &pdev->resource[0], info->io.regsize, info->io.regspacing, 2546 info->irq); 2547 2548 rv = add_smi(info); 2549 if (rv) { 2550 kfree(info); 2551 pci_disable_device(pdev); 2552 } 2553 2554 return rv; 2555 } 2556 2557 static void ipmi_pci_remove(struct pci_dev *pdev) 2558 { 2559 struct smi_info *info = pci_get_drvdata(pdev); 2560 cleanup_one_si(info); 2561 } 2562 2563 static const struct pci_device_id ipmi_pci_devices[] = { 2564 { PCI_DEVICE(PCI_HP_VENDOR_ID, PCI_MMC_DEVICE_ID) }, 2565 { PCI_DEVICE_CLASS(PCI_ERMC_CLASSCODE, PCI_ERMC_CLASSCODE_MASK) }, 2566 { 0, } 2567 }; 2568 MODULE_DEVICE_TABLE(pci, ipmi_pci_devices); 2569 2570 static struct pci_driver ipmi_pci_driver = { 2571 .name = DEVICE_NAME, 2572 .id_table = ipmi_pci_devices, 2573 .probe = ipmi_pci_probe, 2574 .remove = ipmi_pci_remove, 2575 }; 2576 #endif /* CONFIG_PCI */ 2577 2578 #ifdef CONFIG_OF 2579 static const struct of_device_id of_ipmi_match[] = { 2580 { .type = "ipmi", .compatible = "ipmi-kcs", 2581 .data = (void *)(unsigned long) SI_KCS }, 2582 { .type = "ipmi", .compatible = "ipmi-smic", 2583 .data = (void *)(unsigned long) SI_SMIC }, 2584 { .type = "ipmi", .compatible = "ipmi-bt", 2585 .data = (void *)(unsigned long) SI_BT }, 2586 {}, 2587 }; 2588 MODULE_DEVICE_TABLE(of, of_ipmi_match); 2589 2590 static int of_ipmi_probe(struct platform_device *dev) 2591 { 2592 const struct of_device_id *match; 2593 struct smi_info *info; 2594 struct resource resource; 2595 const __be32 *regsize, *regspacing, *regshift; 2596 struct device_node *np = dev->dev.of_node; 2597 int ret; 2598 int proplen; 2599 2600 dev_info(&dev->dev, "probing via device tree\n"); 2601 2602 match = of_match_device(of_ipmi_match, &dev->dev); 2603 if (!match) 2604 return -ENODEV; 2605 2606 if (!of_device_is_available(np)) 2607 return -EINVAL; 2608 2609 ret = of_address_to_resource(np, 0, &resource); 2610 if (ret) { 2611 dev_warn(&dev->dev, PFX "invalid address from OF\n"); 2612 return ret; 2613 } 2614 2615 regsize = of_get_property(np, "reg-size", &proplen); 2616 if (regsize && proplen != 4) { 2617 dev_warn(&dev->dev, PFX "invalid regsize from OF\n"); 2618 return -EINVAL; 2619 } 2620 2621 regspacing = of_get_property(np, "reg-spacing", &proplen); 2622 if (regspacing && proplen != 4) { 2623 dev_warn(&dev->dev, PFX "invalid regspacing from OF\n"); 2624 return -EINVAL; 2625 } 2626 2627 regshift = of_get_property(np, "reg-shift", &proplen); 2628 if (regshift && proplen != 4) { 2629 dev_warn(&dev->dev, PFX "invalid regshift from OF\n"); 2630 return -EINVAL; 2631 } 2632 2633 info = smi_info_alloc(); 2634 2635 if (!info) { 2636 dev_err(&dev->dev, 2637 "could not allocate memory for OF probe\n"); 2638 return -ENOMEM; 2639 } 2640 2641 info->si_type = (enum si_type) match->data; 2642 info->addr_source = SI_DEVICETREE; 2643 info->irq_setup = std_irq_setup; 2644 2645 if (resource.flags & IORESOURCE_IO) { 2646 info->io_setup = port_setup; 2647 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2648 } else { 2649 info->io_setup = mem_setup; 2650 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2651 } 2652 2653 info->io.addr_data = resource.start; 2654 2655 info->io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE; 2656 info->io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING; 2657 info->io.regshift = regshift ? be32_to_cpup(regshift) : 0; 2658 2659 info->irq = irq_of_parse_and_map(dev->dev.of_node, 0); 2660 info->dev = &dev->dev; 2661 2662 dev_dbg(&dev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n", 2663 info->io.addr_data, info->io.regsize, info->io.regspacing, 2664 info->irq); 2665 2666 dev_set_drvdata(&dev->dev, info); 2667 2668 ret = add_smi(info); 2669 if (ret) { 2670 kfree(info); 2671 return ret; 2672 } 2673 return 0; 2674 } 2675 #else 2676 #define of_ipmi_match NULL 2677 static int of_ipmi_probe(struct platform_device *dev) 2678 { 2679 return -ENODEV; 2680 } 2681 #endif 2682 2683 #ifdef CONFIG_ACPI 2684 static int acpi_ipmi_probe(struct platform_device *dev) 2685 { 2686 struct smi_info *info; 2687 struct resource *res, *res_second; 2688 acpi_handle handle; 2689 acpi_status status; 2690 unsigned long long tmp; 2691 int rv = -EINVAL; 2692 2693 if (!si_tryacpi) 2694 return 0; 2695 2696 handle = ACPI_HANDLE(&dev->dev); 2697 if (!handle) 2698 return -ENODEV; 2699 2700 info = smi_info_alloc(); 2701 if (!info) 2702 return -ENOMEM; 2703 2704 info->addr_source = SI_ACPI; 2705 dev_info(&dev->dev, PFX "probing via ACPI\n"); 2706 2707 info->addr_info.acpi_info.acpi_handle = handle; 2708 2709 /* _IFT tells us the interface type: KCS, BT, etc */ 2710 status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp); 2711 if (ACPI_FAILURE(status)) { 2712 dev_err(&dev->dev, "Could not find ACPI IPMI interface type\n"); 2713 goto err_free; 2714 } 2715 2716 switch (tmp) { 2717 case 1: 2718 info->si_type = SI_KCS; 2719 break; 2720 case 2: 2721 info->si_type = SI_SMIC; 2722 break; 2723 case 3: 2724 info->si_type = SI_BT; 2725 break; 2726 case 4: /* SSIF, just ignore */ 2727 rv = -ENODEV; 2728 goto err_free; 2729 default: 2730 dev_info(&dev->dev, "unknown IPMI type %lld\n", tmp); 2731 goto err_free; 2732 } 2733 2734 res = platform_get_resource(dev, IORESOURCE_IO, 0); 2735 if (res) { 2736 info->io_setup = port_setup; 2737 info->io.addr_type = IPMI_IO_ADDR_SPACE; 2738 } else { 2739 res = platform_get_resource(dev, IORESOURCE_MEM, 0); 2740 if (res) { 2741 info->io_setup = mem_setup; 2742 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2743 } 2744 } 2745 if (!res) { 2746 dev_err(&dev->dev, "no I/O or memory address\n"); 2747 goto err_free; 2748 } 2749 info->io.addr_data = res->start; 2750 2751 info->io.regspacing = DEFAULT_REGSPACING; 2752 res_second = platform_get_resource(dev, 2753 (info->io.addr_type == IPMI_IO_ADDR_SPACE) ? 2754 IORESOURCE_IO : IORESOURCE_MEM, 2755 1); 2756 if (res_second) { 2757 if (res_second->start > info->io.addr_data) 2758 info->io.regspacing = 2759 res_second->start - info->io.addr_data; 2760 } 2761 info->io.regsize = DEFAULT_REGSPACING; 2762 info->io.regshift = 0; 2763 2764 /* If _GPE exists, use it; otherwise use standard interrupts */ 2765 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); 2766 if (ACPI_SUCCESS(status)) { 2767 info->irq = tmp; 2768 info->irq_setup = acpi_gpe_irq_setup; 2769 } else { 2770 int irq = platform_get_irq(dev, 0); 2771 2772 if (irq > 0) { 2773 info->irq = irq; 2774 info->irq_setup = std_irq_setup; 2775 } 2776 } 2777 2778 info->dev = &dev->dev; 2779 platform_set_drvdata(dev, info); 2780 2781 dev_info(info->dev, "%pR regsize %d spacing %d irq %d\n", 2782 res, info->io.regsize, info->io.regspacing, 2783 info->irq); 2784 2785 rv = add_smi(info); 2786 if (rv) 2787 kfree(info); 2788 2789 return rv; 2790 2791 err_free: 2792 kfree(info); 2793 return rv; 2794 } 2795 2796 static const struct acpi_device_id acpi_ipmi_match[] = { 2797 { "IPI0001", 0 }, 2798 { }, 2799 }; 2800 MODULE_DEVICE_TABLE(acpi, acpi_ipmi_match); 2801 #else 2802 static int acpi_ipmi_probe(struct platform_device *dev) 2803 { 2804 return -ENODEV; 2805 } 2806 #endif 2807 2808 static int ipmi_probe(struct platform_device *dev) 2809 { 2810 if (of_ipmi_probe(dev) == 0) 2811 return 0; 2812 2813 return acpi_ipmi_probe(dev); 2814 } 2815 2816 static int ipmi_remove(struct platform_device *dev) 2817 { 2818 struct smi_info *info = dev_get_drvdata(&dev->dev); 2819 2820 cleanup_one_si(info); 2821 return 0; 2822 } 2823 2824 static struct platform_driver ipmi_driver = { 2825 .driver = { 2826 .name = DEVICE_NAME, 2827 .of_match_table = of_ipmi_match, 2828 .acpi_match_table = ACPI_PTR(acpi_ipmi_match), 2829 }, 2830 .probe = ipmi_probe, 2831 .remove = ipmi_remove, 2832 }; 2833 2834 #ifdef CONFIG_PARISC 2835 static int ipmi_parisc_probe(struct parisc_device *dev) 2836 { 2837 struct smi_info *info; 2838 int rv; 2839 2840 info = smi_info_alloc(); 2841 2842 if (!info) { 2843 dev_err(&dev->dev, 2844 "could not allocate memory for PARISC probe\n"); 2845 return -ENOMEM; 2846 } 2847 2848 info->si_type = SI_KCS; 2849 info->addr_source = SI_DEVICETREE; 2850 info->io_setup = mem_setup; 2851 info->io.addr_type = IPMI_MEM_ADDR_SPACE; 2852 info->io.addr_data = dev->hpa.start; 2853 info->io.regsize = 1; 2854 info->io.regspacing = 1; 2855 info->io.regshift = 0; 2856 info->irq = 0; /* no interrupt */ 2857 info->irq_setup = NULL; 2858 info->dev = &dev->dev; 2859 2860 dev_dbg(&dev->dev, "addr 0x%lx\n", info->io.addr_data); 2861 2862 dev_set_drvdata(&dev->dev, info); 2863 2864 rv = add_smi(info); 2865 if (rv) { 2866 kfree(info); 2867 return rv; 2868 } 2869 2870 return 0; 2871 } 2872 2873 static int ipmi_parisc_remove(struct parisc_device *dev) 2874 { 2875 cleanup_one_si(dev_get_drvdata(&dev->dev)); 2876 return 0; 2877 } 2878 2879 static const struct parisc_device_id ipmi_parisc_tbl[] = { 2880 { HPHW_MC, HVERSION_REV_ANY_ID, 0x004, 0xC0 }, 2881 { 0, } 2882 }; 2883 2884 static struct parisc_driver ipmi_parisc_driver = { 2885 .name = "ipmi", 2886 .id_table = ipmi_parisc_tbl, 2887 .probe = ipmi_parisc_probe, 2888 .remove = ipmi_parisc_remove, 2889 }; 2890 #endif /* CONFIG_PARISC */ 2891 2892 static int wait_for_msg_done(struct smi_info *smi_info) 2893 { 2894 enum si_sm_result smi_result; 2895 2896 smi_result = smi_info->handlers->event(smi_info->si_sm, 0); 2897 for (;;) { 2898 if (smi_result == SI_SM_CALL_WITH_DELAY || 2899 smi_result == SI_SM_CALL_WITH_TICK_DELAY) { 2900 schedule_timeout_uninterruptible(1); 2901 smi_result = smi_info->handlers->event( 2902 smi_info->si_sm, jiffies_to_usecs(1)); 2903 } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) { 2904 smi_result = smi_info->handlers->event( 2905 smi_info->si_sm, 0); 2906 } else 2907 break; 2908 } 2909 if (smi_result == SI_SM_HOSED) 2910 /* 2911 * We couldn't get the state machine to run, so whatever's at 2912 * the port is probably not an IPMI SMI interface. 2913 */ 2914 return -ENODEV; 2915 2916 return 0; 2917 } 2918 2919 static int try_get_dev_id(struct smi_info *smi_info) 2920 { 2921 unsigned char msg[2]; 2922 unsigned char *resp; 2923 unsigned long resp_len; 2924 int rv = 0; 2925 2926 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); 2927 if (!resp) 2928 return -ENOMEM; 2929 2930 /* 2931 * Do a Get Device ID command, since it comes back with some 2932 * useful info. 2933 */ 2934 msg[0] = IPMI_NETFN_APP_REQUEST << 2; 2935 msg[1] = IPMI_GET_DEVICE_ID_CMD; 2936 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); 2937 2938 rv = wait_for_msg_done(smi_info); 2939 if (rv) 2940 goto out; 2941 2942 resp_len = smi_info->handlers->get_result(smi_info->si_sm, 2943 resp, IPMI_MAX_MSG_LENGTH); 2944 2945 /* Check and record info from the get device id, in case we need it. */ 2946 rv = ipmi_demangle_device_id(resp, resp_len, &smi_info->device_id); 2947 2948 out: 2949 kfree(resp); 2950 return rv; 2951 } 2952 2953 static int get_global_enables(struct smi_info *smi_info, u8 *enables) 2954 { 2955 unsigned char msg[3]; 2956 unsigned char *resp; 2957 unsigned long resp_len; 2958 int rv; 2959 2960 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); 2961 if (!resp) 2962 return -ENOMEM; 2963 2964 msg[0] = IPMI_NETFN_APP_REQUEST << 2; 2965 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; 2966 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); 2967 2968 rv = wait_for_msg_done(smi_info); 2969 if (rv) { 2970 dev_warn(smi_info->dev, 2971 "Error getting response from get global enables command: %d\n", 2972 rv); 2973 goto out; 2974 } 2975 2976 resp_len = smi_info->handlers->get_result(smi_info->si_sm, 2977 resp, IPMI_MAX_MSG_LENGTH); 2978 2979 if (resp_len < 4 || 2980 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || 2981 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || 2982 resp[2] != 0) { 2983 dev_warn(smi_info->dev, 2984 "Invalid return from get global enables command: %ld %x %x %x\n", 2985 resp_len, resp[0], resp[1], resp[2]); 2986 rv = -EINVAL; 2987 goto out; 2988 } else { 2989 *enables = resp[3]; 2990 } 2991 2992 out: 2993 kfree(resp); 2994 return rv; 2995 } 2996 2997 /* 2998 * Returns 1 if it gets an error from the command. 2999 */ 3000 static int set_global_enables(struct smi_info *smi_info, u8 enables) 3001 { 3002 unsigned char msg[3]; 3003 unsigned char *resp; 3004 unsigned long resp_len; 3005 int rv; 3006 3007 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); 3008 if (!resp) 3009 return -ENOMEM; 3010 3011 msg[0] = IPMI_NETFN_APP_REQUEST << 2; 3012 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; 3013 msg[2] = enables; 3014 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); 3015 3016 rv = wait_for_msg_done(smi_info); 3017 if (rv) { 3018 dev_warn(smi_info->dev, 3019 "Error getting response from set global enables command: %d\n", 3020 rv); 3021 goto out; 3022 } 3023 3024 resp_len = smi_info->handlers->get_result(smi_info->si_sm, 3025 resp, IPMI_MAX_MSG_LENGTH); 3026 3027 if (resp_len < 3 || 3028 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || 3029 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { 3030 dev_warn(smi_info->dev, 3031 "Invalid return from set global enables command: %ld %x %x\n", 3032 resp_len, resp[0], resp[1]); 3033 rv = -EINVAL; 3034 goto out; 3035 } 3036 3037 if (resp[2] != 0) 3038 rv = 1; 3039 3040 out: 3041 kfree(resp); 3042 return rv; 3043 } 3044 3045 /* 3046 * Some BMCs do not support clearing the receive irq bit in the global 3047 * enables (even if they don't support interrupts on the BMC). Check 3048 * for this and handle it properly. 3049 */ 3050 static void check_clr_rcv_irq(struct smi_info *smi_info) 3051 { 3052 u8 enables = 0; 3053 int rv; 3054 3055 rv = get_global_enables(smi_info, &enables); 3056 if (!rv) { 3057 if ((enables & IPMI_BMC_RCV_MSG_INTR) == 0) 3058 /* Already clear, should work ok. */ 3059 return; 3060 3061 enables &= ~IPMI_BMC_RCV_MSG_INTR; 3062 rv = set_global_enables(smi_info, enables); 3063 } 3064 3065 if (rv < 0) { 3066 dev_err(smi_info->dev, 3067 "Cannot check clearing the rcv irq: %d\n", rv); 3068 return; 3069 } 3070 3071 if (rv) { 3072 /* 3073 * An error when setting the event buffer bit means 3074 * clearing the bit is not supported. 3075 */ 3076 dev_warn(smi_info->dev, 3077 "The BMC does not support clearing the recv irq bit, compensating, but the BMC needs to be fixed.\n"); 3078 smi_info->cannot_disable_irq = true; 3079 } 3080 } 3081 3082 /* 3083 * Some BMCs do not support setting the interrupt bits in the global 3084 * enables even if they support interrupts. Clearly bad, but we can 3085 * compensate. 3086 */ 3087 static void check_set_rcv_irq(struct smi_info *smi_info) 3088 { 3089 u8 enables = 0; 3090 int rv; 3091 3092 if (!smi_info->irq) 3093 return; 3094 3095 rv = get_global_enables(smi_info, &enables); 3096 if (!rv) { 3097 enables |= IPMI_BMC_RCV_MSG_INTR; 3098 rv = set_global_enables(smi_info, enables); 3099 } 3100 3101 if (rv < 0) { 3102 dev_err(smi_info->dev, 3103 "Cannot check setting the rcv irq: %d\n", rv); 3104 return; 3105 } 3106 3107 if (rv) { 3108 /* 3109 * An error when setting the event buffer bit means 3110 * setting the bit is not supported. 3111 */ 3112 dev_warn(smi_info->dev, 3113 "The BMC does not support setting the recv irq bit, compensating, but the BMC needs to be fixed.\n"); 3114 smi_info->cannot_disable_irq = true; 3115 smi_info->irq_enable_broken = true; 3116 } 3117 } 3118 3119 static int try_enable_event_buffer(struct smi_info *smi_info) 3120 { 3121 unsigned char msg[3]; 3122 unsigned char *resp; 3123 unsigned long resp_len; 3124 int rv = 0; 3125 3126 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); 3127 if (!resp) 3128 return -ENOMEM; 3129 3130 msg[0] = IPMI_NETFN_APP_REQUEST << 2; 3131 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; 3132 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); 3133 3134 rv = wait_for_msg_done(smi_info); 3135 if (rv) { 3136 printk(KERN_WARNING PFX "Error getting response from get" 3137 " global enables command, the event buffer is not" 3138 " enabled.\n"); 3139 goto out; 3140 } 3141 3142 resp_len = smi_info->handlers->get_result(smi_info->si_sm, 3143 resp, IPMI_MAX_MSG_LENGTH); 3144 3145 if (resp_len < 4 || 3146 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || 3147 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD || 3148 resp[2] != 0) { 3149 printk(KERN_WARNING PFX "Invalid return from get global" 3150 " enables command, cannot enable the event buffer.\n"); 3151 rv = -EINVAL; 3152 goto out; 3153 } 3154 3155 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) { 3156 /* buffer is already enabled, nothing to do. */ 3157 smi_info->supports_event_msg_buff = true; 3158 goto out; 3159 } 3160 3161 msg[0] = IPMI_NETFN_APP_REQUEST << 2; 3162 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; 3163 msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF; 3164 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); 3165 3166 rv = wait_for_msg_done(smi_info); 3167 if (rv) { 3168 printk(KERN_WARNING PFX "Error getting response from set" 3169 " global, enables command, the event buffer is not" 3170 " enabled.\n"); 3171 goto out; 3172 } 3173 3174 resp_len = smi_info->handlers->get_result(smi_info->si_sm, 3175 resp, IPMI_MAX_MSG_LENGTH); 3176 3177 if (resp_len < 3 || 3178 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 || 3179 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) { 3180 printk(KERN_WARNING PFX "Invalid return from get global," 3181 "enables command, not enable the event buffer.\n"); 3182 rv = -EINVAL; 3183 goto out; 3184 } 3185 3186 if (resp[2] != 0) 3187 /* 3188 * An error when setting the event buffer bit means 3189 * that the event buffer is not supported. 3190 */ 3191 rv = -ENOENT; 3192 else 3193 smi_info->supports_event_msg_buff = true; 3194 3195 out: 3196 kfree(resp); 3197 return rv; 3198 } 3199 3200 static int smi_type_proc_show(struct seq_file *m, void *v) 3201 { 3202 struct smi_info *smi = m->private; 3203 3204 seq_printf(m, "%s\n", si_to_str[smi->si_type]); 3205 3206 return 0; 3207 } 3208 3209 static int smi_type_proc_open(struct inode *inode, struct file *file) 3210 { 3211 return single_open(file, smi_type_proc_show, PDE_DATA(inode)); 3212 } 3213 3214 static const struct file_operations smi_type_proc_ops = { 3215 .open = smi_type_proc_open, 3216 .read = seq_read, 3217 .llseek = seq_lseek, 3218 .release = single_release, 3219 }; 3220 3221 static int smi_si_stats_proc_show(struct seq_file *m, void *v) 3222 { 3223 struct smi_info *smi = m->private; 3224 3225 seq_printf(m, "interrupts_enabled: %d\n", 3226 smi->irq && !smi->interrupt_disabled); 3227 seq_printf(m, "short_timeouts: %u\n", 3228 smi_get_stat(smi, short_timeouts)); 3229 seq_printf(m, "long_timeouts: %u\n", 3230 smi_get_stat(smi, long_timeouts)); 3231 seq_printf(m, "idles: %u\n", 3232 smi_get_stat(smi, idles)); 3233 seq_printf(m, "interrupts: %u\n", 3234 smi_get_stat(smi, interrupts)); 3235 seq_printf(m, "attentions: %u\n", 3236 smi_get_stat(smi, attentions)); 3237 seq_printf(m, "flag_fetches: %u\n", 3238 smi_get_stat(smi, flag_fetches)); 3239 seq_printf(m, "hosed_count: %u\n", 3240 smi_get_stat(smi, hosed_count)); 3241 seq_printf(m, "complete_transactions: %u\n", 3242 smi_get_stat(smi, complete_transactions)); 3243 seq_printf(m, "events: %u\n", 3244 smi_get_stat(smi, events)); 3245 seq_printf(m, "watchdog_pretimeouts: %u\n", 3246 smi_get_stat(smi, watchdog_pretimeouts)); 3247 seq_printf(m, "incoming_messages: %u\n", 3248 smi_get_stat(smi, incoming_messages)); 3249 return 0; 3250 } 3251 3252 static int smi_si_stats_proc_open(struct inode *inode, struct file *file) 3253 { 3254 return single_open(file, smi_si_stats_proc_show, PDE_DATA(inode)); 3255 } 3256 3257 static const struct file_operations smi_si_stats_proc_ops = { 3258 .open = smi_si_stats_proc_open, 3259 .read = seq_read, 3260 .llseek = seq_lseek, 3261 .release = single_release, 3262 }; 3263 3264 static int smi_params_proc_show(struct seq_file *m, void *v) 3265 { 3266 struct smi_info *smi = m->private; 3267 3268 seq_printf(m, 3269 "%s,%s,0x%lx,rsp=%d,rsi=%d,rsh=%d,irq=%d,ipmb=%d\n", 3270 si_to_str[smi->si_type], 3271 addr_space_to_str[smi->io.addr_type], 3272 smi->io.addr_data, 3273 smi->io.regspacing, 3274 smi->io.regsize, 3275 smi->io.regshift, 3276 smi->irq, 3277 smi->slave_addr); 3278 3279 return 0; 3280 } 3281 3282 static int smi_params_proc_open(struct inode *inode, struct file *file) 3283 { 3284 return single_open(file, smi_params_proc_show, PDE_DATA(inode)); 3285 } 3286 3287 static const struct file_operations smi_params_proc_ops = { 3288 .open = smi_params_proc_open, 3289 .read = seq_read, 3290 .llseek = seq_lseek, 3291 .release = single_release, 3292 }; 3293 3294 /* 3295 * oem_data_avail_to_receive_msg_avail 3296 * @info - smi_info structure with msg_flags set 3297 * 3298 * Converts flags from OEM_DATA_AVAIL to RECEIVE_MSG_AVAIL 3299 * Returns 1 indicating need to re-run handle_flags(). 3300 */ 3301 static int oem_data_avail_to_receive_msg_avail(struct smi_info *smi_info) 3302 { 3303 smi_info->msg_flags = ((smi_info->msg_flags & ~OEM_DATA_AVAIL) | 3304 RECEIVE_MSG_AVAIL); 3305 return 1; 3306 } 3307 3308 /* 3309 * setup_dell_poweredge_oem_data_handler 3310 * @info - smi_info.device_id must be populated 3311 * 3312 * Systems that match, but have firmware version < 1.40 may assert 3313 * OEM0_DATA_AVAIL on their own, without being told via Set Flags that 3314 * it's safe to do so. Such systems will de-assert OEM1_DATA_AVAIL 3315 * upon receipt of IPMI_GET_MSG_CMD, so we should treat these flags 3316 * as RECEIVE_MSG_AVAIL instead. 3317 * 3318 * As Dell has no plans to release IPMI 1.5 firmware that *ever* 3319 * assert the OEM[012] bits, and if it did, the driver would have to 3320 * change to handle that properly, we don't actually check for the 3321 * firmware version. 3322 * Device ID = 0x20 BMC on PowerEdge 8G servers 3323 * Device Revision = 0x80 3324 * Firmware Revision1 = 0x01 BMC version 1.40 3325 * Firmware Revision2 = 0x40 BCD encoded 3326 * IPMI Version = 0x51 IPMI 1.5 3327 * Manufacturer ID = A2 02 00 Dell IANA 3328 * 3329 * Additionally, PowerEdge systems with IPMI < 1.5 may also assert 3330 * OEM0_DATA_AVAIL and needs to be treated as RECEIVE_MSG_AVAIL. 3331 * 3332 */ 3333 #define DELL_POWEREDGE_8G_BMC_DEVICE_ID 0x20 3334 #define DELL_POWEREDGE_8G_BMC_DEVICE_REV 0x80 3335 #define DELL_POWEREDGE_8G_BMC_IPMI_VERSION 0x51 3336 #define DELL_IANA_MFR_ID 0x0002a2 3337 static void setup_dell_poweredge_oem_data_handler(struct smi_info *smi_info) 3338 { 3339 struct ipmi_device_id *id = &smi_info->device_id; 3340 if (id->manufacturer_id == DELL_IANA_MFR_ID) { 3341 if (id->device_id == DELL_POWEREDGE_8G_BMC_DEVICE_ID && 3342 id->device_revision == DELL_POWEREDGE_8G_BMC_DEVICE_REV && 3343 id->ipmi_version == DELL_POWEREDGE_8G_BMC_IPMI_VERSION) { 3344 smi_info->oem_data_avail_handler = 3345 oem_data_avail_to_receive_msg_avail; 3346 } else if (ipmi_version_major(id) < 1 || 3347 (ipmi_version_major(id) == 1 && 3348 ipmi_version_minor(id) < 5)) { 3349 smi_info->oem_data_avail_handler = 3350 oem_data_avail_to_receive_msg_avail; 3351 } 3352 } 3353 } 3354 3355 #define CANNOT_RETURN_REQUESTED_LENGTH 0xCA 3356 static void return_hosed_msg_badsize(struct smi_info *smi_info) 3357 { 3358 struct ipmi_smi_msg *msg = smi_info->curr_msg; 3359 3360 /* Make it a response */ 3361 msg->rsp[0] = msg->data[0] | 4; 3362 msg->rsp[1] = msg->data[1]; 3363 msg->rsp[2] = CANNOT_RETURN_REQUESTED_LENGTH; 3364 msg->rsp_size = 3; 3365 smi_info->curr_msg = NULL; 3366 deliver_recv_msg(smi_info, msg); 3367 } 3368 3369 /* 3370 * dell_poweredge_bt_xaction_handler 3371 * @info - smi_info.device_id must be populated 3372 * 3373 * Dell PowerEdge servers with the BT interface (x6xx and 1750) will 3374 * not respond to a Get SDR command if the length of the data 3375 * requested is exactly 0x3A, which leads to command timeouts and no 3376 * data returned. This intercepts such commands, and causes userspace 3377 * callers to try again with a different-sized buffer, which succeeds. 3378 */ 3379 3380 #define STORAGE_NETFN 0x0A 3381 #define STORAGE_CMD_GET_SDR 0x23 3382 static int dell_poweredge_bt_xaction_handler(struct notifier_block *self, 3383 unsigned long unused, 3384 void *in) 3385 { 3386 struct smi_info *smi_info = in; 3387 unsigned char *data = smi_info->curr_msg->data; 3388 unsigned int size = smi_info->curr_msg->data_size; 3389 if (size >= 8 && 3390 (data[0]>>2) == STORAGE_NETFN && 3391 data[1] == STORAGE_CMD_GET_SDR && 3392 data[7] == 0x3A) { 3393 return_hosed_msg_badsize(smi_info); 3394 return NOTIFY_STOP; 3395 } 3396 return NOTIFY_DONE; 3397 } 3398 3399 static struct notifier_block dell_poweredge_bt_xaction_notifier = { 3400 .notifier_call = dell_poweredge_bt_xaction_handler, 3401 }; 3402 3403 /* 3404 * setup_dell_poweredge_bt_xaction_handler 3405 * @info - smi_info.device_id must be filled in already 3406 * 3407 * Fills in smi_info.device_id.start_transaction_pre_hook 3408 * when we know what function to use there. 3409 */ 3410 static void 3411 setup_dell_poweredge_bt_xaction_handler(struct smi_info *smi_info) 3412 { 3413 struct ipmi_device_id *id = &smi_info->device_id; 3414 if (id->manufacturer_id == DELL_IANA_MFR_ID && 3415 smi_info->si_type == SI_BT) 3416 register_xaction_notifier(&dell_poweredge_bt_xaction_notifier); 3417 } 3418 3419 /* 3420 * setup_oem_data_handler 3421 * @info - smi_info.device_id must be filled in already 3422 * 3423 * Fills in smi_info.device_id.oem_data_available_handler 3424 * when we know what function to use there. 3425 */ 3426 3427 static void setup_oem_data_handler(struct smi_info *smi_info) 3428 { 3429 setup_dell_poweredge_oem_data_handler(smi_info); 3430 } 3431 3432 static void setup_xaction_handlers(struct smi_info *smi_info) 3433 { 3434 setup_dell_poweredge_bt_xaction_handler(smi_info); 3435 } 3436 3437 static void check_for_broken_irqs(struct smi_info *smi_info) 3438 { 3439 check_clr_rcv_irq(smi_info); 3440 check_set_rcv_irq(smi_info); 3441 } 3442 3443 static inline void wait_for_timer_and_thread(struct smi_info *smi_info) 3444 { 3445 if (smi_info->thread != NULL) 3446 kthread_stop(smi_info->thread); 3447 if (smi_info->timer_running) 3448 del_timer_sync(&smi_info->si_timer); 3449 } 3450 3451 static const struct ipmi_default_vals 3452 { 3453 const int type; 3454 const int port; 3455 } ipmi_defaults[] = 3456 { 3457 { .type = SI_KCS, .port = 0xca2 }, 3458 { .type = SI_SMIC, .port = 0xca9 }, 3459 { .type = SI_BT, .port = 0xe4 }, 3460 { .port = 0 } 3461 }; 3462 3463 static void default_find_bmc(void) 3464 { 3465 struct smi_info *info; 3466 int i; 3467 3468 for (i = 0; ; i++) { 3469 if (!ipmi_defaults[i].port) 3470 break; 3471 #ifdef CONFIG_PPC 3472 if (check_legacy_ioport(ipmi_defaults[i].port)) 3473 continue; 3474 #endif 3475 info = smi_info_alloc(); 3476 if (!info) 3477 return; 3478 3479 info->addr_source = SI_DEFAULT; 3480 3481 info->si_type = ipmi_defaults[i].type; 3482 info->io_setup = port_setup; 3483 info->io.addr_data = ipmi_defaults[i].port; 3484 info->io.addr_type = IPMI_IO_ADDR_SPACE; 3485 3486 info->io.addr = NULL; 3487 info->io.regspacing = DEFAULT_REGSPACING; 3488 info->io.regsize = DEFAULT_REGSPACING; 3489 info->io.regshift = 0; 3490 3491 if (add_smi(info) == 0) { 3492 if ((try_smi_init(info)) == 0) { 3493 /* Found one... */ 3494 printk(KERN_INFO PFX "Found default %s" 3495 " state machine at %s address 0x%lx\n", 3496 si_to_str[info->si_type], 3497 addr_space_to_str[info->io.addr_type], 3498 info->io.addr_data); 3499 } else 3500 cleanup_one_si(info); 3501 } else { 3502 kfree(info); 3503 } 3504 } 3505 } 3506 3507 static int is_new_interface(struct smi_info *info) 3508 { 3509 struct smi_info *e; 3510 3511 list_for_each_entry(e, &smi_infos, link) { 3512 if (e->io.addr_type != info->io.addr_type) 3513 continue; 3514 if (e->io.addr_data == info->io.addr_data) 3515 return 0; 3516 } 3517 3518 return 1; 3519 } 3520 3521 static int add_smi(struct smi_info *new_smi) 3522 { 3523 int rv = 0; 3524 3525 printk(KERN_INFO PFX "Adding %s-specified %s state machine", 3526 ipmi_addr_src_to_str(new_smi->addr_source), 3527 si_to_str[new_smi->si_type]); 3528 mutex_lock(&smi_infos_lock); 3529 if (!is_new_interface(new_smi)) { 3530 printk(KERN_CONT " duplicate interface\n"); 3531 rv = -EBUSY; 3532 goto out_err; 3533 } 3534 3535 printk(KERN_CONT "\n"); 3536 3537 /* So we know not to free it unless we have allocated one. */ 3538 new_smi->intf = NULL; 3539 new_smi->si_sm = NULL; 3540 new_smi->handlers = NULL; 3541 3542 list_add_tail(&new_smi->link, &smi_infos); 3543 3544 out_err: 3545 mutex_unlock(&smi_infos_lock); 3546 return rv; 3547 } 3548 3549 static int try_smi_init(struct smi_info *new_smi) 3550 { 3551 int rv = 0; 3552 int i; 3553 3554 printk(KERN_INFO PFX "Trying %s-specified %s state" 3555 " machine at %s address 0x%lx, slave address 0x%x," 3556 " irq %d\n", 3557 ipmi_addr_src_to_str(new_smi->addr_source), 3558 si_to_str[new_smi->si_type], 3559 addr_space_to_str[new_smi->io.addr_type], 3560 new_smi->io.addr_data, 3561 new_smi->slave_addr, new_smi->irq); 3562 3563 switch (new_smi->si_type) { 3564 case SI_KCS: 3565 new_smi->handlers = &kcs_smi_handlers; 3566 break; 3567 3568 case SI_SMIC: 3569 new_smi->handlers = &smic_smi_handlers; 3570 break; 3571 3572 case SI_BT: 3573 new_smi->handlers = &bt_smi_handlers; 3574 break; 3575 3576 default: 3577 /* No support for anything else yet. */ 3578 rv = -EIO; 3579 goto out_err; 3580 } 3581 3582 /* Allocate the state machine's data and initialize it. */ 3583 new_smi->si_sm = kmalloc(new_smi->handlers->size(), GFP_KERNEL); 3584 if (!new_smi->si_sm) { 3585 printk(KERN_ERR PFX 3586 "Could not allocate state machine memory\n"); 3587 rv = -ENOMEM; 3588 goto out_err; 3589 } 3590 new_smi->io_size = new_smi->handlers->init_data(new_smi->si_sm, 3591 &new_smi->io); 3592 3593 /* Now that we know the I/O size, we can set up the I/O. */ 3594 rv = new_smi->io_setup(new_smi); 3595 if (rv) { 3596 printk(KERN_ERR PFX "Could not set up I/O space\n"); 3597 goto out_err; 3598 } 3599 3600 /* Do low-level detection first. */ 3601 if (new_smi->handlers->detect(new_smi->si_sm)) { 3602 if (new_smi->addr_source) 3603 printk(KERN_INFO PFX "Interface detection failed\n"); 3604 rv = -ENODEV; 3605 goto out_err; 3606 } 3607 3608 /* 3609 * Attempt a get device id command. If it fails, we probably 3610 * don't have a BMC here. 3611 */ 3612 rv = try_get_dev_id(new_smi); 3613 if (rv) { 3614 if (new_smi->addr_source) 3615 printk(KERN_INFO PFX "There appears to be no BMC" 3616 " at this location\n"); 3617 goto out_err; 3618 } 3619 3620 setup_oem_data_handler(new_smi); 3621 setup_xaction_handlers(new_smi); 3622 check_for_broken_irqs(new_smi); 3623 3624 new_smi->waiting_msg = NULL; 3625 new_smi->curr_msg = NULL; 3626 atomic_set(&new_smi->req_events, 0); 3627 new_smi->run_to_completion = false; 3628 for (i = 0; i < SI_NUM_STATS; i++) 3629 atomic_set(&new_smi->stats[i], 0); 3630 3631 new_smi->interrupt_disabled = true; 3632 atomic_set(&new_smi->need_watch, 0); 3633 new_smi->intf_num = smi_num; 3634 smi_num++; 3635 3636 rv = try_enable_event_buffer(new_smi); 3637 if (rv == 0) 3638 new_smi->has_event_buffer = true; 3639 3640 /* 3641 * Start clearing the flags before we enable interrupts or the 3642 * timer to avoid racing with the timer. 3643 */ 3644 start_clear_flags(new_smi, false); 3645 3646 /* 3647 * IRQ is defined to be set when non-zero. req_events will 3648 * cause a global flags check that will enable interrupts. 3649 */ 3650 if (new_smi->irq) { 3651 new_smi->interrupt_disabled = false; 3652 atomic_set(&new_smi->req_events, 1); 3653 } 3654 3655 if (!new_smi->dev) { 3656 /* 3657 * If we don't already have a device from something 3658 * else (like PCI), then register a new one. 3659 */ 3660 new_smi->pdev = platform_device_alloc("ipmi_si", 3661 new_smi->intf_num); 3662 if (!new_smi->pdev) { 3663 printk(KERN_ERR PFX 3664 "Unable to allocate platform device\n"); 3665 goto out_err; 3666 } 3667 new_smi->dev = &new_smi->pdev->dev; 3668 new_smi->dev->driver = &ipmi_driver.driver; 3669 3670 rv = platform_device_add(new_smi->pdev); 3671 if (rv) { 3672 printk(KERN_ERR PFX 3673 "Unable to register system interface device:" 3674 " %d\n", 3675 rv); 3676 goto out_err; 3677 } 3678 new_smi->dev_registered = true; 3679 } 3680 3681 rv = ipmi_register_smi(&handlers, 3682 new_smi, 3683 &new_smi->device_id, 3684 new_smi->dev, 3685 new_smi->slave_addr); 3686 if (rv) { 3687 dev_err(new_smi->dev, "Unable to register device: error %d\n", 3688 rv); 3689 goto out_err_stop_timer; 3690 } 3691 3692 rv = ipmi_smi_add_proc_entry(new_smi->intf, "type", 3693 &smi_type_proc_ops, 3694 new_smi); 3695 if (rv) { 3696 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv); 3697 goto out_err_stop_timer; 3698 } 3699 3700 rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats", 3701 &smi_si_stats_proc_ops, 3702 new_smi); 3703 if (rv) { 3704 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv); 3705 goto out_err_stop_timer; 3706 } 3707 3708 rv = ipmi_smi_add_proc_entry(new_smi->intf, "params", 3709 &smi_params_proc_ops, 3710 new_smi); 3711 if (rv) { 3712 dev_err(new_smi->dev, "Unable to create proc entry: %d\n", rv); 3713 goto out_err_stop_timer; 3714 } 3715 3716 dev_info(new_smi->dev, "IPMI %s interface initialized\n", 3717 si_to_str[new_smi->si_type]); 3718 3719 return 0; 3720 3721 out_err_stop_timer: 3722 wait_for_timer_and_thread(new_smi); 3723 3724 out_err: 3725 new_smi->interrupt_disabled = true; 3726 3727 if (new_smi->intf) { 3728 ipmi_smi_t intf = new_smi->intf; 3729 new_smi->intf = NULL; 3730 ipmi_unregister_smi(intf); 3731 } 3732 3733 if (new_smi->irq_cleanup) { 3734 new_smi->irq_cleanup(new_smi); 3735 new_smi->irq_cleanup = NULL; 3736 } 3737 3738 /* 3739 * Wait until we know that we are out of any interrupt 3740 * handlers might have been running before we freed the 3741 * interrupt. 3742 */ 3743 synchronize_sched(); 3744 3745 if (new_smi->si_sm) { 3746 if (new_smi->handlers) 3747 new_smi->handlers->cleanup(new_smi->si_sm); 3748 kfree(new_smi->si_sm); 3749 new_smi->si_sm = NULL; 3750 } 3751 if (new_smi->addr_source_cleanup) { 3752 new_smi->addr_source_cleanup(new_smi); 3753 new_smi->addr_source_cleanup = NULL; 3754 } 3755 if (new_smi->io_cleanup) { 3756 new_smi->io_cleanup(new_smi); 3757 new_smi->io_cleanup = NULL; 3758 } 3759 3760 if (new_smi->dev_registered) { 3761 platform_device_unregister(new_smi->pdev); 3762 new_smi->dev_registered = false; 3763 } 3764 3765 return rv; 3766 } 3767 3768 static int init_ipmi_si(void) 3769 { 3770 int i; 3771 char *str; 3772 int rv; 3773 struct smi_info *e; 3774 enum ipmi_addr_src type = SI_INVALID; 3775 3776 if (initialized) 3777 return 0; 3778 initialized = 1; 3779 3780 if (si_tryplatform) { 3781 rv = platform_driver_register(&ipmi_driver); 3782 if (rv) { 3783 printk(KERN_ERR PFX "Unable to register " 3784 "driver: %d\n", rv); 3785 return rv; 3786 } 3787 } 3788 3789 /* Parse out the si_type string into its components. */ 3790 str = si_type_str; 3791 if (*str != '\0') { 3792 for (i = 0; (i < SI_MAX_PARMS) && (*str != '\0'); i++) { 3793 si_type[i] = str; 3794 str = strchr(str, ','); 3795 if (str) { 3796 *str = '\0'; 3797 str++; 3798 } else { 3799 break; 3800 } 3801 } 3802 } 3803 3804 printk(KERN_INFO "IPMI System Interface driver.\n"); 3805 3806 /* If the user gave us a device, they presumably want us to use it */ 3807 if (!hardcode_find_bmc()) 3808 return 0; 3809 3810 #ifdef CONFIG_PCI 3811 if (si_trypci) { 3812 rv = pci_register_driver(&ipmi_pci_driver); 3813 if (rv) 3814 printk(KERN_ERR PFX "Unable to register " 3815 "PCI driver: %d\n", rv); 3816 else 3817 pci_registered = true; 3818 } 3819 #endif 3820 3821 #ifdef CONFIG_DMI 3822 if (si_trydmi) 3823 dmi_find_bmc(); 3824 #endif 3825 3826 #ifdef CONFIG_ACPI 3827 if (si_tryacpi) 3828 spmi_find_bmc(); 3829 #endif 3830 3831 #ifdef CONFIG_PARISC 3832 register_parisc_driver(&ipmi_parisc_driver); 3833 parisc_registered = true; 3834 /* poking PC IO addresses will crash machine, don't do it */ 3835 si_trydefaults = 0; 3836 #endif 3837 3838 /* We prefer devices with interrupts, but in the case of a machine 3839 with multiple BMCs we assume that there will be several instances 3840 of a given type so if we succeed in registering a type then also 3841 try to register everything else of the same type */ 3842 3843 mutex_lock(&smi_infos_lock); 3844 list_for_each_entry(e, &smi_infos, link) { 3845 /* Try to register a device if it has an IRQ and we either 3846 haven't successfully registered a device yet or this 3847 device has the same type as one we successfully registered */ 3848 if (e->irq && (!type || e->addr_source == type)) { 3849 if (!try_smi_init(e)) { 3850 type = e->addr_source; 3851 } 3852 } 3853 } 3854 3855 /* type will only have been set if we successfully registered an si */ 3856 if (type) { 3857 mutex_unlock(&smi_infos_lock); 3858 return 0; 3859 } 3860 3861 /* Fall back to the preferred device */ 3862 3863 list_for_each_entry(e, &smi_infos, link) { 3864 if (!e->irq && (!type || e->addr_source == type)) { 3865 if (!try_smi_init(e)) { 3866 type = e->addr_source; 3867 } 3868 } 3869 } 3870 mutex_unlock(&smi_infos_lock); 3871 3872 if (type) 3873 return 0; 3874 3875 if (si_trydefaults) { 3876 mutex_lock(&smi_infos_lock); 3877 if (list_empty(&smi_infos)) { 3878 /* No BMC was found, try defaults. */ 3879 mutex_unlock(&smi_infos_lock); 3880 default_find_bmc(); 3881 } else 3882 mutex_unlock(&smi_infos_lock); 3883 } 3884 3885 mutex_lock(&smi_infos_lock); 3886 if (unload_when_empty && list_empty(&smi_infos)) { 3887 mutex_unlock(&smi_infos_lock); 3888 cleanup_ipmi_si(); 3889 printk(KERN_WARNING PFX 3890 "Unable to find any System Interface(s)\n"); 3891 return -ENODEV; 3892 } else { 3893 mutex_unlock(&smi_infos_lock); 3894 return 0; 3895 } 3896 } 3897 module_init(init_ipmi_si); 3898 3899 static void cleanup_one_si(struct smi_info *to_clean) 3900 { 3901 int rv = 0; 3902 3903 if (!to_clean) 3904 return; 3905 3906 if (to_clean->intf) { 3907 ipmi_smi_t intf = to_clean->intf; 3908 3909 to_clean->intf = NULL; 3910 rv = ipmi_unregister_smi(intf); 3911 if (rv) { 3912 pr_err(PFX "Unable to unregister device: errno=%d\n", 3913 rv); 3914 } 3915 } 3916 3917 if (to_clean->dev) 3918 dev_set_drvdata(to_clean->dev, NULL); 3919 3920 list_del(&to_clean->link); 3921 3922 /* 3923 * Make sure that interrupts, the timer and the thread are 3924 * stopped and will not run again. 3925 */ 3926 if (to_clean->irq_cleanup) 3927 to_clean->irq_cleanup(to_clean); 3928 wait_for_timer_and_thread(to_clean); 3929 3930 /* 3931 * Timeouts are stopped, now make sure the interrupts are off 3932 * in the BMC. Note that timers and CPU interrupts are off, 3933 * so no need for locks. 3934 */ 3935 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) { 3936 poll(to_clean); 3937 schedule_timeout_uninterruptible(1); 3938 } 3939 disable_si_irq(to_clean, false); 3940 while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) { 3941 poll(to_clean); 3942 schedule_timeout_uninterruptible(1); 3943 } 3944 3945 if (to_clean->handlers) 3946 to_clean->handlers->cleanup(to_clean->si_sm); 3947 3948 kfree(to_clean->si_sm); 3949 3950 if (to_clean->addr_source_cleanup) 3951 to_clean->addr_source_cleanup(to_clean); 3952 if (to_clean->io_cleanup) 3953 to_clean->io_cleanup(to_clean); 3954 3955 if (to_clean->dev_registered) 3956 platform_device_unregister(to_clean->pdev); 3957 3958 kfree(to_clean); 3959 } 3960 3961 static void cleanup_ipmi_si(void) 3962 { 3963 struct smi_info *e, *tmp_e; 3964 3965 if (!initialized) 3966 return; 3967 3968 #ifdef CONFIG_PCI 3969 if (pci_registered) 3970 pci_unregister_driver(&ipmi_pci_driver); 3971 #endif 3972 #ifdef CONFIG_PARISC 3973 if (parisc_registered) 3974 unregister_parisc_driver(&ipmi_parisc_driver); 3975 #endif 3976 3977 platform_driver_unregister(&ipmi_driver); 3978 3979 mutex_lock(&smi_infos_lock); 3980 list_for_each_entry_safe(e, tmp_e, &smi_infos, link) 3981 cleanup_one_si(e); 3982 mutex_unlock(&smi_infos_lock); 3983 } 3984 module_exit(cleanup_ipmi_si); 3985 3986 MODULE_LICENSE("GPL"); 3987 MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); 3988 MODULE_DESCRIPTION("Interface to the IPMI driver for the KCS, SMIC, and BT" 3989 " system interfaces."); 3990