1 /* 2 * PowerNV OPAL high level interfaces 3 * 4 * Copyright 2011 IBM Corp. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #define pr_fmt(fmt) "opal: " fmt 13 14 #include <linux/printk.h> 15 #include <linux/types.h> 16 #include <linux/of.h> 17 #include <linux/of_fdt.h> 18 #include <linux/of_platform.h> 19 #include <linux/interrupt.h> 20 #include <linux/notifier.h> 21 #include <linux/slab.h> 22 #include <linux/sched.h> 23 #include <linux/kobject.h> 24 #include <linux/delay.h> 25 #include <linux/memblock.h> 26 #include <linux/kthread.h> 27 #include <linux/freezer.h> 28 29 #include <asm/machdep.h> 30 #include <asm/opal.h> 31 #include <asm/firmware.h> 32 #include <asm/mce.h> 33 34 #include "powernv.h" 35 36 /* /sys/firmware/opal */ 37 struct kobject *opal_kobj; 38 39 struct opal { 40 u64 base; 41 u64 entry; 42 u64 size; 43 } opal; 44 45 struct mcheck_recoverable_range { 46 u64 start_addr; 47 u64 end_addr; 48 u64 recover_addr; 49 }; 50 51 static struct mcheck_recoverable_range *mc_recoverable_range; 52 static int mc_recoverable_range_len; 53 54 struct device_node *opal_node; 55 static DEFINE_SPINLOCK(opal_write_lock); 56 static unsigned int *opal_irqs; 57 static unsigned int opal_irq_count; 58 static ATOMIC_NOTIFIER_HEAD(opal_notifier_head); 59 static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 60 static DEFINE_SPINLOCK(opal_notifier_lock); 61 static uint64_t last_notified_mask = 0x0ul; 62 static atomic_t opal_notifier_hold = ATOMIC_INIT(0); 63 static uint32_t opal_heartbeat; 64 65 static void opal_reinit_cores(void) 66 { 67 /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 68 * 69 * It will preserve non volatile GPRs and HSPRG0/1. It will 70 * also restore HIDs and other SPRs to their original value 71 * but it might clobber a bunch. 72 */ 73 #ifdef __BIG_ENDIAN__ 74 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); 75 #else 76 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); 77 #endif 78 } 79 80 int __init early_init_dt_scan_opal(unsigned long node, 81 const char *uname, int depth, void *data) 82 { 83 const void *basep, *entryp, *sizep; 84 int basesz, entrysz, runtimesz; 85 86 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 87 return 0; 88 89 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 90 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 91 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 92 93 if (!basep || !entryp || !sizep) 94 return 1; 95 96 opal.base = of_read_number(basep, basesz/4); 97 opal.entry = of_read_number(entryp, entrysz/4); 98 opal.size = of_read_number(sizep, runtimesz/4); 99 100 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 101 opal.base, basep, basesz); 102 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 103 opal.entry, entryp, entrysz); 104 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 105 opal.size, sizep, runtimesz); 106 107 powerpc_firmware_features |= FW_FEATURE_OPAL; 108 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 109 powerpc_firmware_features |= FW_FEATURE_OPALv2; 110 powerpc_firmware_features |= FW_FEATURE_OPALv3; 111 pr_info("OPAL V3 detected !\n"); 112 } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { 113 powerpc_firmware_features |= FW_FEATURE_OPALv2; 114 pr_info("OPAL V2 detected !\n"); 115 } else { 116 pr_info("OPAL V1 detected !\n"); 117 } 118 119 /* Reinit all cores with the right endian */ 120 opal_reinit_cores(); 121 122 /* Restore some bits */ 123 if (cur_cpu_spec->cpu_restore) 124 cur_cpu_spec->cpu_restore(); 125 126 return 1; 127 } 128 129 int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 130 const char *uname, int depth, void *data) 131 { 132 int i, psize, size; 133 const __be32 *prop; 134 135 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 136 return 0; 137 138 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 139 140 if (!prop) 141 return 1; 142 143 pr_debug("Found machine check recoverable ranges.\n"); 144 145 /* 146 * Calculate number of available entries. 147 * 148 * Each recoverable address range entry is (start address, len, 149 * recovery address), 2 cells each for start and recovery address, 150 * 1 cell for len, totalling 5 cells per entry. 151 */ 152 mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 153 154 /* Sanity check */ 155 if (!mc_recoverable_range_len) 156 return 1; 157 158 /* Size required to hold all the entries. */ 159 size = mc_recoverable_range_len * 160 sizeof(struct mcheck_recoverable_range); 161 162 /* 163 * Allocate a buffer to hold the MC recoverable ranges. We would be 164 * accessing them in real mode, hence it needs to be within 165 * RMO region. 166 */ 167 mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 168 ppc64_rma_size)); 169 memset(mc_recoverable_range, 0, size); 170 171 for (i = 0; i < mc_recoverable_range_len; i++) { 172 mc_recoverable_range[i].start_addr = 173 of_read_number(prop + (i * 5) + 0, 2); 174 mc_recoverable_range[i].end_addr = 175 mc_recoverable_range[i].start_addr + 176 of_read_number(prop + (i * 5) + 2, 1); 177 mc_recoverable_range[i].recover_addr = 178 of_read_number(prop + (i * 5) + 3, 2); 179 180 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 181 mc_recoverable_range[i].start_addr, 182 mc_recoverable_range[i].end_addr, 183 mc_recoverable_range[i].recover_addr); 184 } 185 return 1; 186 } 187 188 static int __init opal_register_exception_handlers(void) 189 { 190 #ifdef __BIG_ENDIAN__ 191 u64 glue; 192 193 if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 194 return -ENODEV; 195 196 /* Hookup some exception handlers except machine check. We use the 197 * fwnmi area at 0x7000 to provide the glue space to OPAL 198 */ 199 glue = 0x7000; 200 201 /* 202 * Check if we are running on newer firmware that exports 203 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 204 * the HMI interrupt and we catch it directly in Linux. 205 * 206 * For older firmware (i.e currently released POWER8 System Firmware 207 * as of today <= SV810_087), we fallback to old behavior and let OPAL 208 * patch the HMI vector and handle it inside OPAL firmware. 209 * 210 * For newer firmware (in development/yet to be released) we will 211 * start catching/handling HMI directly in Linux. 212 */ 213 if (!opal_check_token(OPAL_HANDLE_HMI)) { 214 pr_info("Old firmware detected, OPAL handles HMIs.\n"); 215 opal_register_exception_handler( 216 OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 217 0, glue); 218 glue += 128; 219 } 220 221 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 222 #endif 223 224 return 0; 225 } 226 machine_early_initcall(powernv, opal_register_exception_handlers); 227 228 int opal_notifier_register(struct notifier_block *nb) 229 { 230 if (!nb) { 231 pr_warning("%s: Invalid argument (%p)\n", 232 __func__, nb); 233 return -EINVAL; 234 } 235 236 atomic_notifier_chain_register(&opal_notifier_head, nb); 237 return 0; 238 } 239 EXPORT_SYMBOL_GPL(opal_notifier_register); 240 241 int opal_notifier_unregister(struct notifier_block *nb) 242 { 243 if (!nb) { 244 pr_warning("%s: Invalid argument (%p)\n", 245 __func__, nb); 246 return -EINVAL; 247 } 248 249 atomic_notifier_chain_unregister(&opal_notifier_head, nb); 250 return 0; 251 } 252 EXPORT_SYMBOL_GPL(opal_notifier_unregister); 253 254 static void opal_do_notifier(uint64_t events) 255 { 256 unsigned long flags; 257 uint64_t changed_mask; 258 259 if (atomic_read(&opal_notifier_hold)) 260 return; 261 262 spin_lock_irqsave(&opal_notifier_lock, flags); 263 changed_mask = last_notified_mask ^ events; 264 last_notified_mask = events; 265 spin_unlock_irqrestore(&opal_notifier_lock, flags); 266 267 /* 268 * We feed with the event bits and changed bits for 269 * enough information to the callback. 270 */ 271 atomic_notifier_call_chain(&opal_notifier_head, 272 events, (void *)changed_mask); 273 } 274 275 void opal_notifier_update_evt(uint64_t evt_mask, 276 uint64_t evt_val) 277 { 278 unsigned long flags; 279 280 spin_lock_irqsave(&opal_notifier_lock, flags); 281 last_notified_mask &= ~evt_mask; 282 last_notified_mask |= evt_val; 283 spin_unlock_irqrestore(&opal_notifier_lock, flags); 284 } 285 286 void opal_notifier_enable(void) 287 { 288 int64_t rc; 289 __be64 evt = 0; 290 291 atomic_set(&opal_notifier_hold, 0); 292 293 /* Process pending events */ 294 rc = opal_poll_events(&evt); 295 if (rc == OPAL_SUCCESS && evt) 296 opal_do_notifier(be64_to_cpu(evt)); 297 } 298 299 void opal_notifier_disable(void) 300 { 301 atomic_set(&opal_notifier_hold, 1); 302 } 303 304 /* 305 * Opal message notifier based on message type. Allow subscribers to get 306 * notified for specific messgae type. 307 */ 308 int opal_message_notifier_register(enum opal_msg_type msg_type, 309 struct notifier_block *nb) 310 { 311 if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 312 pr_warning("%s: Invalid arguments, msg_type:%d\n", 313 __func__, msg_type); 314 return -EINVAL; 315 } 316 317 return atomic_notifier_chain_register( 318 &opal_msg_notifier_head[msg_type], nb); 319 } 320 321 int opal_message_notifier_unregister(enum opal_msg_type msg_type, 322 struct notifier_block *nb) 323 { 324 return atomic_notifier_chain_unregister( 325 &opal_msg_notifier_head[msg_type], nb); 326 } 327 328 static void opal_message_do_notify(uint32_t msg_type, void *msg) 329 { 330 /* notify subscribers */ 331 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 332 msg_type, msg); 333 } 334 335 static void opal_handle_message(void) 336 { 337 s64 ret; 338 /* 339 * TODO: pre-allocate a message buffer depending on opal-msg-size 340 * value in /proc/device-tree. 341 */ 342 static struct opal_msg msg; 343 u32 type; 344 345 ret = opal_get_msg(__pa(&msg), sizeof(msg)); 346 /* No opal message pending. */ 347 if (ret == OPAL_RESOURCE) 348 return; 349 350 /* check for errors. */ 351 if (ret) { 352 pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 353 __func__, ret); 354 return; 355 } 356 357 type = be32_to_cpu(msg.msg_type); 358 359 /* Sanity check */ 360 if (type >= OPAL_MSG_TYPE_MAX) { 361 pr_warning("%s: Unknown message type: %u\n", __func__, type); 362 return; 363 } 364 opal_message_do_notify(type, (void *)&msg); 365 } 366 367 static int opal_message_notify(struct notifier_block *nb, 368 unsigned long events, void *change) 369 { 370 if (events & OPAL_EVENT_MSG_PENDING) 371 opal_handle_message(); 372 return 0; 373 } 374 375 static struct notifier_block opal_message_nb = { 376 .notifier_call = opal_message_notify, 377 .next = NULL, 378 .priority = 0, 379 }; 380 381 static int __init opal_message_init(void) 382 { 383 int ret, i; 384 385 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 386 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 387 388 ret = opal_notifier_register(&opal_message_nb); 389 if (ret) { 390 pr_err("%s: Can't register OPAL event notifier (%d)\n", 391 __func__, ret); 392 return ret; 393 } 394 return 0; 395 } 396 machine_early_initcall(powernv, opal_message_init); 397 398 int opal_get_chars(uint32_t vtermno, char *buf, int count) 399 { 400 s64 rc; 401 __be64 evt, len; 402 403 if (!opal.entry) 404 return -ENODEV; 405 opal_poll_events(&evt); 406 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 407 return 0; 408 len = cpu_to_be64(count); 409 rc = opal_console_read(vtermno, &len, buf); 410 if (rc == OPAL_SUCCESS) 411 return be64_to_cpu(len); 412 return 0; 413 } 414 415 int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 416 { 417 int written = 0; 418 __be64 olen; 419 s64 len, rc; 420 unsigned long flags; 421 __be64 evt; 422 423 if (!opal.entry) 424 return -ENODEV; 425 426 /* We want put_chars to be atomic to avoid mangling of hvsi 427 * packets. To do that, we first test for room and return 428 * -EAGAIN if there isn't enough. 429 * 430 * Unfortunately, opal_console_write_buffer_space() doesn't 431 * appear to work on opal v1, so we just assume there is 432 * enough room and be done with it 433 */ 434 spin_lock_irqsave(&opal_write_lock, flags); 435 if (firmware_has_feature(FW_FEATURE_OPALv2)) { 436 rc = opal_console_write_buffer_space(vtermno, &olen); 437 len = be64_to_cpu(olen); 438 if (rc || len < total_len) { 439 spin_unlock_irqrestore(&opal_write_lock, flags); 440 /* Closed -> drop characters */ 441 if (rc) 442 return total_len; 443 opal_poll_events(NULL); 444 return -EAGAIN; 445 } 446 } 447 448 /* We still try to handle partial completions, though they 449 * should no longer happen. 450 */ 451 rc = OPAL_BUSY; 452 while(total_len > 0 && (rc == OPAL_BUSY || 453 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 454 olen = cpu_to_be64(total_len); 455 rc = opal_console_write(vtermno, &olen, data); 456 len = be64_to_cpu(olen); 457 458 /* Closed or other error drop */ 459 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 460 rc != OPAL_BUSY_EVENT) { 461 written = total_len; 462 break; 463 } 464 if (rc == OPAL_SUCCESS) { 465 total_len -= len; 466 data += len; 467 written += len; 468 } 469 /* This is a bit nasty but we need that for the console to 470 * flush when there aren't any interrupts. We will clean 471 * things a bit later to limit that to synchronous path 472 * such as the kernel console and xmon/udbg 473 */ 474 do 475 opal_poll_events(&evt); 476 while(rc == OPAL_SUCCESS && 477 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 478 } 479 spin_unlock_irqrestore(&opal_write_lock, flags); 480 return written; 481 } 482 483 static int opal_recover_mce(struct pt_regs *regs, 484 struct machine_check_event *evt) 485 { 486 int recovered = 0; 487 uint64_t ea = get_mce_fault_addr(evt); 488 489 if (!(regs->msr & MSR_RI)) { 490 /* If MSR_RI isn't set, we cannot recover */ 491 recovered = 0; 492 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 493 /* Platform corrected itself */ 494 recovered = 1; 495 } else if (ea && !is_kernel_addr(ea)) { 496 /* 497 * Faulting address is not in kernel text. We should be fine. 498 * We need to find which process uses this address. 499 * For now, kill the task if we have received exception when 500 * in userspace. 501 * 502 * TODO: Queue up this address for hwpoisioning later. 503 */ 504 if (user_mode(regs) && !is_global_init(current)) { 505 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 506 recovered = 1; 507 } else 508 recovered = 0; 509 } else if (user_mode(regs) && !is_global_init(current) && 510 evt->severity == MCE_SEV_ERROR_SYNC) { 511 /* 512 * If we have received a synchronous error when in userspace 513 * kill the task. 514 */ 515 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 516 recovered = 1; 517 } 518 return recovered; 519 } 520 521 int opal_machine_check(struct pt_regs *regs) 522 { 523 struct machine_check_event evt; 524 525 if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 526 return 0; 527 528 /* Print things out */ 529 if (evt.version != MCE_V1) { 530 pr_err("Machine Check Exception, Unknown event version %d !\n", 531 evt.version); 532 return 0; 533 } 534 machine_check_print_event_info(&evt); 535 536 if (opal_recover_mce(regs, &evt)) 537 return 1; 538 return 0; 539 } 540 541 /* Early hmi handler called in real mode. */ 542 int opal_hmi_exception_early(struct pt_regs *regs) 543 { 544 s64 rc; 545 546 /* 547 * call opal hmi handler. Pass paca address as token. 548 * The return value OPAL_SUCCESS is an indication that there is 549 * an HMI event generated waiting to pull by Linux. 550 */ 551 rc = opal_handle_hmi(); 552 if (rc == OPAL_SUCCESS) { 553 local_paca->hmi_event_available = 1; 554 return 1; 555 } 556 return 0; 557 } 558 559 /* HMI exception handler called in virtual mode during check_irq_replay. */ 560 int opal_handle_hmi_exception(struct pt_regs *regs) 561 { 562 s64 rc; 563 __be64 evt = 0; 564 565 /* 566 * Check if HMI event is available. 567 * if Yes, then call opal_poll_events to pull opal messages and 568 * process them. 569 */ 570 if (!local_paca->hmi_event_available) 571 return 0; 572 573 local_paca->hmi_event_available = 0; 574 rc = opal_poll_events(&evt); 575 if (rc == OPAL_SUCCESS && evt) 576 opal_do_notifier(be64_to_cpu(evt)); 577 578 return 1; 579 } 580 581 static uint64_t find_recovery_address(uint64_t nip) 582 { 583 int i; 584 585 for (i = 0; i < mc_recoverable_range_len; i++) 586 if ((nip >= mc_recoverable_range[i].start_addr) && 587 (nip < mc_recoverable_range[i].end_addr)) 588 return mc_recoverable_range[i].recover_addr; 589 return 0; 590 } 591 592 bool opal_mce_check_early_recovery(struct pt_regs *regs) 593 { 594 uint64_t recover_addr = 0; 595 596 if (!opal.base || !opal.size) 597 goto out; 598 599 if ((regs->nip >= opal.base) && 600 (regs->nip <= (opal.base + opal.size))) 601 recover_addr = find_recovery_address(regs->nip); 602 603 /* 604 * Setup regs->nip to rfi into fixup address. 605 */ 606 if (recover_addr) 607 regs->nip = recover_addr; 608 609 out: 610 return !!recover_addr; 611 } 612 613 static irqreturn_t opal_interrupt(int irq, void *data) 614 { 615 __be64 events; 616 617 opal_handle_interrupt(virq_to_hw(irq), &events); 618 619 opal_do_notifier(be64_to_cpu(events)); 620 621 return IRQ_HANDLED; 622 } 623 624 static int opal_sysfs_init(void) 625 { 626 opal_kobj = kobject_create_and_add("opal", firmware_kobj); 627 if (!opal_kobj) { 628 pr_warn("kobject_create_and_add opal failed\n"); 629 return -ENOMEM; 630 } 631 632 return 0; 633 } 634 635 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 636 struct bin_attribute *bin_attr, 637 char *buf, loff_t off, size_t count) 638 { 639 return memory_read_from_buffer(buf, count, &off, bin_attr->private, 640 bin_attr->size); 641 } 642 643 static BIN_ATTR_RO(symbol_map, 0); 644 645 static void opal_export_symmap(void) 646 { 647 const __be64 *syms; 648 unsigned int size; 649 struct device_node *fw; 650 int rc; 651 652 fw = of_find_node_by_path("/ibm,opal/firmware"); 653 if (!fw) 654 return; 655 syms = of_get_property(fw, "symbol-map", &size); 656 if (!syms || size != 2 * sizeof(__be64)) 657 return; 658 659 /* Setup attributes */ 660 bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 661 bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 662 663 rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 664 if (rc) 665 pr_warn("Error %d creating OPAL symbols file\n", rc); 666 } 667 668 static void __init opal_dump_region_init(void) 669 { 670 void *addr; 671 uint64_t size; 672 int rc; 673 674 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 675 return; 676 677 /* Register kernel log buffer */ 678 addr = log_buf_addr_get(); 679 if (addr == NULL) 680 return; 681 682 size = log_buf_len_get(); 683 if (size == 0) 684 return; 685 686 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 687 __pa(addr), size); 688 /* Don't warn if this is just an older OPAL that doesn't 689 * know about that call 690 */ 691 if (rc && rc != OPAL_UNSUPPORTED) 692 pr_warn("DUMP: Failed to register kernel log buffer. " 693 "rc = %d\n", rc); 694 } 695 696 static void opal_ipmi_init(struct device_node *opal_node) 697 { 698 struct device_node *np; 699 700 for_each_child_of_node(opal_node, np) 701 if (of_device_is_compatible(np, "ibm,opal-ipmi")) 702 of_platform_device_create(np, NULL, NULL); 703 } 704 705 static void opal_i2c_create_devs(void) 706 { 707 struct device_node *np; 708 709 for_each_compatible_node(np, NULL, "ibm,opal-i2c") 710 of_platform_device_create(np, NULL, NULL); 711 } 712 713 static void __init opal_irq_init(struct device_node *dn) 714 { 715 const __be32 *irqs; 716 int i, irqlen; 717 718 /* Get interrupt property */ 719 irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); 720 opal_irq_count = irqs ? (irqlen / 4) : 0; 721 pr_debug("Found %d interrupts reserved for OPAL\n", opal_irq_count); 722 if (!opal_irq_count) 723 return; 724 725 /* Install interrupt handlers */ 726 opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); 727 for (i = 0; irqs && i < opal_irq_count; i++, irqs++) { 728 unsigned int irq, virq; 729 int rc; 730 731 /* Get hardware and virtual IRQ */ 732 irq = be32_to_cpup(irqs); 733 virq = irq_create_mapping(NULL, irq); 734 if (virq == NO_IRQ) { 735 pr_warn("Failed to map irq 0x%x\n", irq); 736 continue; 737 } 738 739 /* Install interrupt handler */ 740 rc = request_irq(virq, opal_interrupt, 0, "opal", NULL); 741 if (rc) { 742 irq_dispose_mapping(virq); 743 pr_warn("Error %d requesting irq %d (0x%x)\n", 744 rc, virq, irq); 745 continue; 746 } 747 748 /* Cache IRQ */ 749 opal_irqs[i] = virq; 750 } 751 } 752 753 static int kopald(void *unused) 754 { 755 set_freezable(); 756 do { 757 try_to_freeze(); 758 opal_poll_events(NULL); 759 msleep_interruptible(opal_heartbeat); 760 } while (!kthread_should_stop()); 761 762 return 0; 763 } 764 765 static void opal_init_heartbeat(void) 766 { 767 /* Old firwmware, we assume the HVC heartbeat is sufficient */ 768 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 769 &opal_heartbeat) != 0) 770 opal_heartbeat = 0; 771 772 if (opal_heartbeat) 773 kthread_run(kopald, NULL, "kopald"); 774 } 775 776 static int __init opal_init(void) 777 { 778 struct device_node *np, *consoles; 779 int rc; 780 781 opal_node = of_find_node_by_path("/ibm,opal"); 782 if (!opal_node) { 783 pr_warn("Device node not found\n"); 784 return -ENODEV; 785 } 786 787 /* Register OPAL consoles if any ports */ 788 if (firmware_has_feature(FW_FEATURE_OPALv2)) 789 consoles = of_find_node_by_path("/ibm,opal/consoles"); 790 else 791 consoles = of_node_get(opal_node); 792 if (consoles) { 793 for_each_child_of_node(consoles, np) { 794 if (strcmp(np->name, "serial")) 795 continue; 796 of_platform_device_create(np, NULL, NULL); 797 } 798 of_node_put(consoles); 799 } 800 801 /* Create i2c platform devices */ 802 opal_i2c_create_devs(); 803 804 /* Setup a heatbeat thread if requested by OPAL */ 805 opal_init_heartbeat(); 806 807 /* Find all OPAL interrupts and request them */ 808 opal_irq_init(opal_node); 809 810 /* Create "opal" kobject under /sys/firmware */ 811 rc = opal_sysfs_init(); 812 if (rc == 0) { 813 /* Export symbol map to userspace */ 814 opal_export_symmap(); 815 /* Setup dump region interface */ 816 opal_dump_region_init(); 817 /* Setup error log interface */ 818 rc = opal_elog_init(); 819 /* Setup code update interface */ 820 opal_flash_init(); 821 /* Setup platform dump extract interface */ 822 opal_platform_dump_init(); 823 /* Setup system parameters interface */ 824 opal_sys_param_init(); 825 /* Setup message log interface. */ 826 opal_msglog_init(); 827 } 828 829 /* Initialize OPAL IPMI backend */ 830 opal_ipmi_init(opal_node); 831 832 return 0; 833 } 834 machine_subsys_initcall(powernv, opal_init); 835 836 void opal_shutdown(void) 837 { 838 unsigned int i; 839 long rc = OPAL_BUSY; 840 841 /* First free interrupts, which will also mask them */ 842 for (i = 0; i < opal_irq_count; i++) { 843 if (opal_irqs[i]) 844 free_irq(opal_irqs[i], NULL); 845 opal_irqs[i] = 0; 846 } 847 848 /* 849 * Then sync with OPAL which ensure anything that can 850 * potentially write to our memory has completed such 851 * as an ongoing dump retrieval 852 */ 853 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 854 rc = opal_sync_host_reboot(); 855 if (rc == OPAL_BUSY) 856 opal_poll_events(NULL); 857 else 858 mdelay(10); 859 } 860 861 /* Unregister memory dump region */ 862 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 863 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 864 } 865 866 /* Export this so that test modules can use it */ 867 EXPORT_SYMBOL_GPL(opal_invalid_call); 868 EXPORT_SYMBOL_GPL(opal_ipmi_send); 869 EXPORT_SYMBOL_GPL(opal_ipmi_recv); 870 871 /* Convert a region of vmalloc memory to an opal sg list */ 872 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 873 unsigned long vmalloc_size) 874 { 875 struct opal_sg_list *sg, *first = NULL; 876 unsigned long i = 0; 877 878 sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 879 if (!sg) 880 goto nomem; 881 882 first = sg; 883 884 while (vmalloc_size > 0) { 885 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 886 uint64_t length = min(vmalloc_size, PAGE_SIZE); 887 888 sg->entry[i].data = cpu_to_be64(data); 889 sg->entry[i].length = cpu_to_be64(length); 890 i++; 891 892 if (i >= SG_ENTRIES_PER_NODE) { 893 struct opal_sg_list *next; 894 895 next = kzalloc(PAGE_SIZE, GFP_KERNEL); 896 if (!next) 897 goto nomem; 898 899 sg->length = cpu_to_be64( 900 i * sizeof(struct opal_sg_entry) + 16); 901 i = 0; 902 sg->next = cpu_to_be64(__pa(next)); 903 sg = next; 904 } 905 906 vmalloc_addr += length; 907 vmalloc_size -= length; 908 } 909 910 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 911 912 return first; 913 914 nomem: 915 pr_err("%s : Failed to allocate memory\n", __func__); 916 opal_free_sg_list(first); 917 return NULL; 918 } 919 920 void opal_free_sg_list(struct opal_sg_list *sg) 921 { 922 while (sg) { 923 uint64_t next = be64_to_cpu(sg->next); 924 925 kfree(sg); 926 927 if (next) 928 sg = __va(next); 929 else 930 sg = NULL; 931 } 932 } 933 934 EXPORT_SYMBOL_GPL(opal_poll_events); 935 EXPORT_SYMBOL_GPL(opal_rtc_read); 936 EXPORT_SYMBOL_GPL(opal_rtc_write); 937 EXPORT_SYMBOL_GPL(opal_tpo_read); 938 EXPORT_SYMBOL_GPL(opal_tpo_write); 939 EXPORT_SYMBOL_GPL(opal_i2c_request); 940