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