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 struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 57 static uint32_t opal_heartbeat; 58 59 static void opal_reinit_cores(void) 60 { 61 /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 62 * 63 * It will preserve non volatile GPRs and HSPRG0/1. It will 64 * also restore HIDs and other SPRs to their original value 65 * but it might clobber a bunch. 66 */ 67 #ifdef __BIG_ENDIAN__ 68 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); 69 #else 70 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); 71 #endif 72 } 73 74 int __init early_init_dt_scan_opal(unsigned long node, 75 const char *uname, int depth, void *data) 76 { 77 const void *basep, *entryp, *sizep; 78 int basesz, entrysz, runtimesz; 79 80 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 81 return 0; 82 83 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 84 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 85 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 86 87 if (!basep || !entryp || !sizep) 88 return 1; 89 90 opal.base = of_read_number(basep, basesz/4); 91 opal.entry = of_read_number(entryp, entrysz/4); 92 opal.size = of_read_number(sizep, runtimesz/4); 93 94 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 95 opal.base, basep, basesz); 96 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 97 opal.entry, entryp, entrysz); 98 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 99 opal.size, sizep, runtimesz); 100 101 powerpc_firmware_features |= FW_FEATURE_OPAL; 102 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 103 powerpc_firmware_features |= FW_FEATURE_OPALv2; 104 powerpc_firmware_features |= FW_FEATURE_OPALv3; 105 pr_info("OPAL V3 detected !\n"); 106 } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { 107 powerpc_firmware_features |= FW_FEATURE_OPALv2; 108 pr_info("OPAL V2 detected !\n"); 109 } else { 110 pr_info("OPAL V1 detected !\n"); 111 } 112 113 /* Reinit all cores with the right endian */ 114 opal_reinit_cores(); 115 116 /* Restore some bits */ 117 if (cur_cpu_spec->cpu_restore) 118 cur_cpu_spec->cpu_restore(); 119 120 return 1; 121 } 122 123 int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 124 const char *uname, int depth, void *data) 125 { 126 int i, psize, size; 127 const __be32 *prop; 128 129 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 130 return 0; 131 132 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 133 134 if (!prop) 135 return 1; 136 137 pr_debug("Found machine check recoverable ranges.\n"); 138 139 /* 140 * Calculate number of available entries. 141 * 142 * Each recoverable address range entry is (start address, len, 143 * recovery address), 2 cells each for start and recovery address, 144 * 1 cell for len, totalling 5 cells per entry. 145 */ 146 mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 147 148 /* Sanity check */ 149 if (!mc_recoverable_range_len) 150 return 1; 151 152 /* Size required to hold all the entries. */ 153 size = mc_recoverable_range_len * 154 sizeof(struct mcheck_recoverable_range); 155 156 /* 157 * Allocate a buffer to hold the MC recoverable ranges. We would be 158 * accessing them in real mode, hence it needs to be within 159 * RMO region. 160 */ 161 mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 162 ppc64_rma_size)); 163 memset(mc_recoverable_range, 0, size); 164 165 for (i = 0; i < mc_recoverable_range_len; i++) { 166 mc_recoverable_range[i].start_addr = 167 of_read_number(prop + (i * 5) + 0, 2); 168 mc_recoverable_range[i].end_addr = 169 mc_recoverable_range[i].start_addr + 170 of_read_number(prop + (i * 5) + 2, 1); 171 mc_recoverable_range[i].recover_addr = 172 of_read_number(prop + (i * 5) + 3, 2); 173 174 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 175 mc_recoverable_range[i].start_addr, 176 mc_recoverable_range[i].end_addr, 177 mc_recoverable_range[i].recover_addr); 178 } 179 return 1; 180 } 181 182 static int __init opal_register_exception_handlers(void) 183 { 184 #ifdef __BIG_ENDIAN__ 185 u64 glue; 186 187 if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 188 return -ENODEV; 189 190 /* Hookup some exception handlers except machine check. We use the 191 * fwnmi area at 0x7000 to provide the glue space to OPAL 192 */ 193 glue = 0x7000; 194 195 /* 196 * Check if we are running on newer firmware that exports 197 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 198 * the HMI interrupt and we catch it directly in Linux. 199 * 200 * For older firmware (i.e currently released POWER8 System Firmware 201 * as of today <= SV810_087), we fallback to old behavior and let OPAL 202 * patch the HMI vector and handle it inside OPAL firmware. 203 * 204 * For newer firmware (in development/yet to be released) we will 205 * start catching/handling HMI directly in Linux. 206 */ 207 if (!opal_check_token(OPAL_HANDLE_HMI)) { 208 pr_info("Old firmware detected, OPAL handles HMIs.\n"); 209 opal_register_exception_handler( 210 OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 211 0, glue); 212 glue += 128; 213 } 214 215 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 216 #endif 217 218 return 0; 219 } 220 machine_early_initcall(powernv, opal_register_exception_handlers); 221 222 /* 223 * Opal message notifier based on message type. Allow subscribers to get 224 * notified for specific messgae type. 225 */ 226 int opal_message_notifier_register(enum opal_msg_type msg_type, 227 struct notifier_block *nb) 228 { 229 if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 230 pr_warning("%s: Invalid arguments, msg_type:%d\n", 231 __func__, msg_type); 232 return -EINVAL; 233 } 234 235 return atomic_notifier_chain_register( 236 &opal_msg_notifier_head[msg_type], nb); 237 } 238 EXPORT_SYMBOL_GPL(opal_message_notifier_register); 239 240 int opal_message_notifier_unregister(enum opal_msg_type msg_type, 241 struct notifier_block *nb) 242 { 243 return atomic_notifier_chain_unregister( 244 &opal_msg_notifier_head[msg_type], nb); 245 } 246 EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 247 248 static void opal_message_do_notify(uint32_t msg_type, void *msg) 249 { 250 /* notify subscribers */ 251 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 252 msg_type, msg); 253 } 254 255 static void opal_handle_message(void) 256 { 257 s64 ret; 258 /* 259 * TODO: pre-allocate a message buffer depending on opal-msg-size 260 * value in /proc/device-tree. 261 */ 262 static struct opal_msg msg; 263 u32 type; 264 265 ret = opal_get_msg(__pa(&msg), sizeof(msg)); 266 /* No opal message pending. */ 267 if (ret == OPAL_RESOURCE) 268 return; 269 270 /* check for errors. */ 271 if (ret) { 272 pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 273 __func__, ret); 274 return; 275 } 276 277 type = be32_to_cpu(msg.msg_type); 278 279 /* Sanity check */ 280 if (type >= OPAL_MSG_TYPE_MAX) { 281 pr_warning("%s: Unknown message type: %u\n", __func__, type); 282 return; 283 } 284 opal_message_do_notify(type, (void *)&msg); 285 } 286 287 static irqreturn_t opal_message_notify(int irq, void *data) 288 { 289 opal_handle_message(); 290 return IRQ_HANDLED; 291 } 292 293 static int __init opal_message_init(void) 294 { 295 int ret, i, irq; 296 297 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 298 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 299 300 irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 301 if (!irq) { 302 pr_err("%s: Can't register OPAL event irq (%d)\n", 303 __func__, irq); 304 return irq; 305 } 306 307 ret = request_irq(irq, opal_message_notify, 308 IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 309 if (ret) { 310 pr_err("%s: Can't request OPAL event irq (%d)\n", 311 __func__, ret); 312 return ret; 313 } 314 315 return 0; 316 } 317 318 int opal_get_chars(uint32_t vtermno, char *buf, int count) 319 { 320 s64 rc; 321 __be64 evt, len; 322 323 if (!opal.entry) 324 return -ENODEV; 325 opal_poll_events(&evt); 326 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 327 return 0; 328 len = cpu_to_be64(count); 329 rc = opal_console_read(vtermno, &len, buf); 330 if (rc == OPAL_SUCCESS) 331 return be64_to_cpu(len); 332 return 0; 333 } 334 335 int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 336 { 337 int written = 0; 338 __be64 olen; 339 s64 len, rc; 340 unsigned long flags; 341 __be64 evt; 342 343 if (!opal.entry) 344 return -ENODEV; 345 346 /* We want put_chars to be atomic to avoid mangling of hvsi 347 * packets. To do that, we first test for room and return 348 * -EAGAIN if there isn't enough. 349 * 350 * Unfortunately, opal_console_write_buffer_space() doesn't 351 * appear to work on opal v1, so we just assume there is 352 * enough room and be done with it 353 */ 354 spin_lock_irqsave(&opal_write_lock, flags); 355 if (firmware_has_feature(FW_FEATURE_OPALv2)) { 356 rc = opal_console_write_buffer_space(vtermno, &olen); 357 len = be64_to_cpu(olen); 358 if (rc || len < total_len) { 359 spin_unlock_irqrestore(&opal_write_lock, flags); 360 /* Closed -> drop characters */ 361 if (rc) 362 return total_len; 363 opal_poll_events(NULL); 364 return -EAGAIN; 365 } 366 } 367 368 /* We still try to handle partial completions, though they 369 * should no longer happen. 370 */ 371 rc = OPAL_BUSY; 372 while(total_len > 0 && (rc == OPAL_BUSY || 373 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 374 olen = cpu_to_be64(total_len); 375 rc = opal_console_write(vtermno, &olen, data); 376 len = be64_to_cpu(olen); 377 378 /* Closed or other error drop */ 379 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 380 rc != OPAL_BUSY_EVENT) { 381 written = total_len; 382 break; 383 } 384 if (rc == OPAL_SUCCESS) { 385 total_len -= len; 386 data += len; 387 written += len; 388 } 389 /* This is a bit nasty but we need that for the console to 390 * flush when there aren't any interrupts. We will clean 391 * things a bit later to limit that to synchronous path 392 * such as the kernel console and xmon/udbg 393 */ 394 do 395 opal_poll_events(&evt); 396 while(rc == OPAL_SUCCESS && 397 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 398 } 399 spin_unlock_irqrestore(&opal_write_lock, flags); 400 return written; 401 } 402 403 static int opal_recover_mce(struct pt_regs *regs, 404 struct machine_check_event *evt) 405 { 406 int recovered = 0; 407 uint64_t ea = get_mce_fault_addr(evt); 408 409 if (!(regs->msr & MSR_RI)) { 410 /* If MSR_RI isn't set, we cannot recover */ 411 recovered = 0; 412 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 413 /* Platform corrected itself */ 414 recovered = 1; 415 } else if (ea && !is_kernel_addr(ea)) { 416 /* 417 * Faulting address is not in kernel text. We should be fine. 418 * We need to find which process uses this address. 419 * For now, kill the task if we have received exception when 420 * in userspace. 421 * 422 * TODO: Queue up this address for hwpoisioning later. 423 */ 424 if (user_mode(regs) && !is_global_init(current)) { 425 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 426 recovered = 1; 427 } else 428 recovered = 0; 429 } else if (user_mode(regs) && !is_global_init(current) && 430 evt->severity == MCE_SEV_ERROR_SYNC) { 431 /* 432 * If we have received a synchronous error when in userspace 433 * kill the task. 434 */ 435 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 436 recovered = 1; 437 } 438 return recovered; 439 } 440 441 int opal_machine_check(struct pt_regs *regs) 442 { 443 struct machine_check_event evt; 444 int ret; 445 446 if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 447 return 0; 448 449 /* Print things out */ 450 if (evt.version != MCE_V1) { 451 pr_err("Machine Check Exception, Unknown event version %d !\n", 452 evt.version); 453 return 0; 454 } 455 machine_check_print_event_info(&evt); 456 457 if (opal_recover_mce(regs, &evt)) 458 return 1; 459 460 /* 461 * Unrecovered machine check, we are heading to panic path. 462 * 463 * We may have hit this MCE in very early stage of kernel 464 * initialization even before opal-prd has started running. If 465 * this is the case then this MCE error may go un-noticed or 466 * un-analyzed if we go down panic path. We need to inform 467 * BMC/OCC about this error so that they can collect relevant 468 * data for error analysis before rebooting. 469 * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. 470 * This function may not return on BMC based system. 471 */ 472 ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, 473 "Unrecoverable Machine Check exception"); 474 if (ret == OPAL_UNSUPPORTED) { 475 pr_emerg("Reboot type %d not supported\n", 476 OPAL_REBOOT_PLATFORM_ERROR); 477 } 478 479 /* 480 * We reached here. There can be three possibilities: 481 * 1. We are running on a firmware level that do not support 482 * opal_cec_reboot2() 483 * 2. We are running on a firmware level that do not support 484 * OPAL_REBOOT_PLATFORM_ERROR reboot type. 485 * 3. We are running on FSP based system that does not need opal 486 * to trigger checkstop explicitly for error analysis. The FSP 487 * PRD component would have already got notified about this 488 * error through other channels. 489 * 490 * In any case, let us just fall through. We anyway heading 491 * down to panic path. 492 */ 493 return 0; 494 } 495 496 /* Early hmi handler called in real mode. */ 497 int opal_hmi_exception_early(struct pt_regs *regs) 498 { 499 s64 rc; 500 501 /* 502 * call opal hmi handler. Pass paca address as token. 503 * The return value OPAL_SUCCESS is an indication that there is 504 * an HMI event generated waiting to pull by Linux. 505 */ 506 rc = opal_handle_hmi(); 507 if (rc == OPAL_SUCCESS) { 508 local_paca->hmi_event_available = 1; 509 return 1; 510 } 511 return 0; 512 } 513 514 /* HMI exception handler called in virtual mode during check_irq_replay. */ 515 int opal_handle_hmi_exception(struct pt_regs *regs) 516 { 517 s64 rc; 518 __be64 evt = 0; 519 520 /* 521 * Check if HMI event is available. 522 * if Yes, then call opal_poll_events to pull opal messages and 523 * process them. 524 */ 525 if (!local_paca->hmi_event_available) 526 return 0; 527 528 local_paca->hmi_event_available = 0; 529 rc = opal_poll_events(&evt); 530 if (rc == OPAL_SUCCESS && evt) 531 opal_handle_events(be64_to_cpu(evt)); 532 533 return 1; 534 } 535 536 static uint64_t find_recovery_address(uint64_t nip) 537 { 538 int i; 539 540 for (i = 0; i < mc_recoverable_range_len; i++) 541 if ((nip >= mc_recoverable_range[i].start_addr) && 542 (nip < mc_recoverable_range[i].end_addr)) 543 return mc_recoverable_range[i].recover_addr; 544 return 0; 545 } 546 547 bool opal_mce_check_early_recovery(struct pt_regs *regs) 548 { 549 uint64_t recover_addr = 0; 550 551 if (!opal.base || !opal.size) 552 goto out; 553 554 if ((regs->nip >= opal.base) && 555 (regs->nip <= (opal.base + opal.size))) 556 recover_addr = find_recovery_address(regs->nip); 557 558 /* 559 * Setup regs->nip to rfi into fixup address. 560 */ 561 if (recover_addr) 562 regs->nip = recover_addr; 563 564 out: 565 return !!recover_addr; 566 } 567 568 static int opal_sysfs_init(void) 569 { 570 opal_kobj = kobject_create_and_add("opal", firmware_kobj); 571 if (!opal_kobj) { 572 pr_warn("kobject_create_and_add opal failed\n"); 573 return -ENOMEM; 574 } 575 576 return 0; 577 } 578 579 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 580 struct bin_attribute *bin_attr, 581 char *buf, loff_t off, size_t count) 582 { 583 return memory_read_from_buffer(buf, count, &off, bin_attr->private, 584 bin_attr->size); 585 } 586 587 static BIN_ATTR_RO(symbol_map, 0); 588 589 static void opal_export_symmap(void) 590 { 591 const __be64 *syms; 592 unsigned int size; 593 struct device_node *fw; 594 int rc; 595 596 fw = of_find_node_by_path("/ibm,opal/firmware"); 597 if (!fw) 598 return; 599 syms = of_get_property(fw, "symbol-map", &size); 600 if (!syms || size != 2 * sizeof(__be64)) 601 return; 602 603 /* Setup attributes */ 604 bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 605 bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 606 607 rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 608 if (rc) 609 pr_warn("Error %d creating OPAL symbols file\n", rc); 610 } 611 612 static void __init opal_dump_region_init(void) 613 { 614 void *addr; 615 uint64_t size; 616 int rc; 617 618 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 619 return; 620 621 /* Register kernel log buffer */ 622 addr = log_buf_addr_get(); 623 if (addr == NULL) 624 return; 625 626 size = log_buf_len_get(); 627 if (size == 0) 628 return; 629 630 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 631 __pa(addr), size); 632 /* Don't warn if this is just an older OPAL that doesn't 633 * know about that call 634 */ 635 if (rc && rc != OPAL_UNSUPPORTED) 636 pr_warn("DUMP: Failed to register kernel log buffer. " 637 "rc = %d\n", rc); 638 } 639 640 static void opal_pdev_init(struct device_node *opal_node, 641 const char *compatible) 642 { 643 struct device_node *np; 644 645 for_each_child_of_node(opal_node, np) 646 if (of_device_is_compatible(np, compatible)) 647 of_platform_device_create(np, NULL, NULL); 648 } 649 650 static void opal_i2c_create_devs(void) 651 { 652 struct device_node *np; 653 654 for_each_compatible_node(np, NULL, "ibm,opal-i2c") 655 of_platform_device_create(np, NULL, NULL); 656 } 657 658 static int kopald(void *unused) 659 { 660 __be64 events; 661 662 set_freezable(); 663 do { 664 try_to_freeze(); 665 opal_poll_events(&events); 666 opal_handle_events(be64_to_cpu(events)); 667 msleep_interruptible(opal_heartbeat); 668 } while (!kthread_should_stop()); 669 670 return 0; 671 } 672 673 static void opal_init_heartbeat(void) 674 { 675 /* Old firwmware, we assume the HVC heartbeat is sufficient */ 676 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 677 &opal_heartbeat) != 0) 678 opal_heartbeat = 0; 679 680 if (opal_heartbeat) 681 kthread_run(kopald, NULL, "kopald"); 682 } 683 684 static int __init opal_init(void) 685 { 686 struct device_node *np, *consoles, *leds; 687 int rc; 688 689 opal_node = of_find_node_by_path("/ibm,opal"); 690 if (!opal_node) { 691 pr_warn("Device node not found\n"); 692 return -ENODEV; 693 } 694 695 /* Register OPAL consoles if any ports */ 696 if (firmware_has_feature(FW_FEATURE_OPALv2)) 697 consoles = of_find_node_by_path("/ibm,opal/consoles"); 698 else 699 consoles = of_node_get(opal_node); 700 if (consoles) { 701 for_each_child_of_node(consoles, np) { 702 if (strcmp(np->name, "serial")) 703 continue; 704 of_platform_device_create(np, NULL, NULL); 705 } 706 of_node_put(consoles); 707 } 708 709 /* Initialise OPAL messaging system */ 710 opal_message_init(); 711 712 /* Initialise OPAL asynchronous completion interface */ 713 opal_async_comp_init(); 714 715 /* Initialise OPAL sensor interface */ 716 opal_sensor_init(); 717 718 /* Initialise OPAL hypervisor maintainence interrupt handling */ 719 opal_hmi_handler_init(); 720 721 /* Create i2c platform devices */ 722 opal_i2c_create_devs(); 723 724 /* Setup a heatbeat thread if requested by OPAL */ 725 opal_init_heartbeat(); 726 727 /* Create leds platform devices */ 728 leds = of_find_node_by_path("/ibm,opal/leds"); 729 if (leds) { 730 of_platform_device_create(leds, "opal_leds", NULL); 731 of_node_put(leds); 732 } 733 734 /* Create "opal" kobject under /sys/firmware */ 735 rc = opal_sysfs_init(); 736 if (rc == 0) { 737 /* Export symbol map to userspace */ 738 opal_export_symmap(); 739 /* Setup dump region interface */ 740 opal_dump_region_init(); 741 /* Setup error log interface */ 742 rc = opal_elog_init(); 743 /* Setup code update interface */ 744 opal_flash_update_init(); 745 /* Setup platform dump extract interface */ 746 opal_platform_dump_init(); 747 /* Setup system parameters interface */ 748 opal_sys_param_init(); 749 /* Setup message log interface. */ 750 opal_msglog_init(); 751 } 752 753 /* Initialize platform devices: IPMI backend, PRD & flash interface */ 754 opal_pdev_init(opal_node, "ibm,opal-ipmi"); 755 opal_pdev_init(opal_node, "ibm,opal-flash"); 756 opal_pdev_init(opal_node, "ibm,opal-prd"); 757 758 return 0; 759 } 760 machine_subsys_initcall(powernv, opal_init); 761 762 void opal_shutdown(void) 763 { 764 long rc = OPAL_BUSY; 765 766 opal_event_shutdown(); 767 768 /* 769 * Then sync with OPAL which ensure anything that can 770 * potentially write to our memory has completed such 771 * as an ongoing dump retrieval 772 */ 773 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 774 rc = opal_sync_host_reboot(); 775 if (rc == OPAL_BUSY) 776 opal_poll_events(NULL); 777 else 778 mdelay(10); 779 } 780 781 /* Unregister memory dump region */ 782 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 783 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 784 } 785 786 /* Export this so that test modules can use it */ 787 EXPORT_SYMBOL_GPL(opal_invalid_call); 788 EXPORT_SYMBOL_GPL(opal_xscom_read); 789 EXPORT_SYMBOL_GPL(opal_xscom_write); 790 EXPORT_SYMBOL_GPL(opal_ipmi_send); 791 EXPORT_SYMBOL_GPL(opal_ipmi_recv); 792 EXPORT_SYMBOL_GPL(opal_flash_read); 793 EXPORT_SYMBOL_GPL(opal_flash_write); 794 EXPORT_SYMBOL_GPL(opal_flash_erase); 795 EXPORT_SYMBOL_GPL(opal_prd_msg); 796 797 /* Convert a region of vmalloc memory to an opal sg list */ 798 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 799 unsigned long vmalloc_size) 800 { 801 struct opal_sg_list *sg, *first = NULL; 802 unsigned long i = 0; 803 804 sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 805 if (!sg) 806 goto nomem; 807 808 first = sg; 809 810 while (vmalloc_size > 0) { 811 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 812 uint64_t length = min(vmalloc_size, PAGE_SIZE); 813 814 sg->entry[i].data = cpu_to_be64(data); 815 sg->entry[i].length = cpu_to_be64(length); 816 i++; 817 818 if (i >= SG_ENTRIES_PER_NODE) { 819 struct opal_sg_list *next; 820 821 next = kzalloc(PAGE_SIZE, GFP_KERNEL); 822 if (!next) 823 goto nomem; 824 825 sg->length = cpu_to_be64( 826 i * sizeof(struct opal_sg_entry) + 16); 827 i = 0; 828 sg->next = cpu_to_be64(__pa(next)); 829 sg = next; 830 } 831 832 vmalloc_addr += length; 833 vmalloc_size -= length; 834 } 835 836 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 837 838 return first; 839 840 nomem: 841 pr_err("%s : Failed to allocate memory\n", __func__); 842 opal_free_sg_list(first); 843 return NULL; 844 } 845 846 void opal_free_sg_list(struct opal_sg_list *sg) 847 { 848 while (sg) { 849 uint64_t next = be64_to_cpu(sg->next); 850 851 kfree(sg); 852 853 if (next) 854 sg = __va(next); 855 else 856 sg = NULL; 857 } 858 } 859 860 int opal_error_code(int rc) 861 { 862 switch (rc) { 863 case OPAL_SUCCESS: return 0; 864 865 case OPAL_PARAMETER: return -EINVAL; 866 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 867 case OPAL_BUSY_EVENT: return -EBUSY; 868 case OPAL_NO_MEM: return -ENOMEM; 869 case OPAL_PERMISSION: return -EPERM; 870 871 case OPAL_UNSUPPORTED: return -EIO; 872 case OPAL_HARDWARE: return -EIO; 873 case OPAL_INTERNAL_ERROR: return -EIO; 874 default: 875 pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 876 return -EIO; 877 } 878 } 879 880 EXPORT_SYMBOL_GPL(opal_poll_events); 881 EXPORT_SYMBOL_GPL(opal_rtc_read); 882 EXPORT_SYMBOL_GPL(opal_rtc_write); 883 EXPORT_SYMBOL_GPL(opal_tpo_read); 884 EXPORT_SYMBOL_GPL(opal_tpo_write); 885 EXPORT_SYMBOL_GPL(opal_i2c_request); 886 /* Export these symbols for PowerNV LED class driver */ 887 EXPORT_SYMBOL_GPL(opal_leds_get_ind); 888 EXPORT_SYMBOL_GPL(opal_leds_set_ind); 889