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 static struct task_struct *kopald_tsk; 59 60 static void opal_reinit_cores(void) 61 { 62 /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 63 * 64 * It will preserve non volatile GPRs and HSPRG0/1. It will 65 * also restore HIDs and other SPRs to their original value 66 * but it might clobber a bunch. 67 */ 68 #ifdef __BIG_ENDIAN__ 69 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); 70 #else 71 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); 72 #endif 73 } 74 75 int __init early_init_dt_scan_opal(unsigned long node, 76 const char *uname, int depth, void *data) 77 { 78 const void *basep, *entryp, *sizep; 79 int basesz, entrysz, runtimesz; 80 81 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 82 return 0; 83 84 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 85 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 86 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 87 88 if (!basep || !entryp || !sizep) 89 return 1; 90 91 opal.base = of_read_number(basep, basesz/4); 92 opal.entry = of_read_number(entryp, entrysz/4); 93 opal.size = of_read_number(sizep, runtimesz/4); 94 95 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 96 opal.base, basep, basesz); 97 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 98 opal.entry, entryp, entrysz); 99 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 100 opal.size, sizep, runtimesz); 101 102 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 103 powerpc_firmware_features |= FW_FEATURE_OPAL; 104 pr_info("OPAL detected !\n"); 105 } else { 106 panic("OPAL != V3 detected, no longer supported.\n"); 107 } 108 109 /* Reinit all cores with the right endian */ 110 opal_reinit_cores(); 111 112 /* Restore some bits */ 113 if (cur_cpu_spec->cpu_restore) 114 cur_cpu_spec->cpu_restore(); 115 116 return 1; 117 } 118 119 int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 120 const char *uname, int depth, void *data) 121 { 122 int i, psize, size; 123 const __be32 *prop; 124 125 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 126 return 0; 127 128 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 129 130 if (!prop) 131 return 1; 132 133 pr_debug("Found machine check recoverable ranges.\n"); 134 135 /* 136 * Calculate number of available entries. 137 * 138 * Each recoverable address range entry is (start address, len, 139 * recovery address), 2 cells each for start and recovery address, 140 * 1 cell for len, totalling 5 cells per entry. 141 */ 142 mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 143 144 /* Sanity check */ 145 if (!mc_recoverable_range_len) 146 return 1; 147 148 /* Size required to hold all the entries. */ 149 size = mc_recoverable_range_len * 150 sizeof(struct mcheck_recoverable_range); 151 152 /* 153 * Allocate a buffer to hold the MC recoverable ranges. We would be 154 * accessing them in real mode, hence it needs to be within 155 * RMO region. 156 */ 157 mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 158 ppc64_rma_size)); 159 memset(mc_recoverable_range, 0, size); 160 161 for (i = 0; i < mc_recoverable_range_len; i++) { 162 mc_recoverable_range[i].start_addr = 163 of_read_number(prop + (i * 5) + 0, 2); 164 mc_recoverable_range[i].end_addr = 165 mc_recoverable_range[i].start_addr + 166 of_read_number(prop + (i * 5) + 2, 1); 167 mc_recoverable_range[i].recover_addr = 168 of_read_number(prop + (i * 5) + 3, 2); 169 170 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 171 mc_recoverable_range[i].start_addr, 172 mc_recoverable_range[i].end_addr, 173 mc_recoverable_range[i].recover_addr); 174 } 175 return 1; 176 } 177 178 static int __init opal_register_exception_handlers(void) 179 { 180 #ifdef __BIG_ENDIAN__ 181 u64 glue; 182 183 if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 184 return -ENODEV; 185 186 /* Hookup some exception handlers except machine check. We use the 187 * fwnmi area at 0x7000 to provide the glue space to OPAL 188 */ 189 glue = 0x7000; 190 191 /* 192 * Check if we are running on newer firmware that exports 193 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 194 * the HMI interrupt and we catch it directly in Linux. 195 * 196 * For older firmware (i.e currently released POWER8 System Firmware 197 * as of today <= SV810_087), we fallback to old behavior and let OPAL 198 * patch the HMI vector and handle it inside OPAL firmware. 199 * 200 * For newer firmware (in development/yet to be released) we will 201 * start catching/handling HMI directly in Linux. 202 */ 203 if (!opal_check_token(OPAL_HANDLE_HMI)) { 204 pr_info("Old firmware detected, OPAL handles HMIs.\n"); 205 opal_register_exception_handler( 206 OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 207 0, glue); 208 glue += 128; 209 } 210 211 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 212 #endif 213 214 return 0; 215 } 216 machine_early_initcall(powernv, opal_register_exception_handlers); 217 218 /* 219 * Opal message notifier based on message type. Allow subscribers to get 220 * notified for specific messgae type. 221 */ 222 int opal_message_notifier_register(enum opal_msg_type msg_type, 223 struct notifier_block *nb) 224 { 225 if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 226 pr_warning("%s: Invalid arguments, msg_type:%d\n", 227 __func__, msg_type); 228 return -EINVAL; 229 } 230 231 return atomic_notifier_chain_register( 232 &opal_msg_notifier_head[msg_type], nb); 233 } 234 EXPORT_SYMBOL_GPL(opal_message_notifier_register); 235 236 int opal_message_notifier_unregister(enum opal_msg_type msg_type, 237 struct notifier_block *nb) 238 { 239 return atomic_notifier_chain_unregister( 240 &opal_msg_notifier_head[msg_type], nb); 241 } 242 EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 243 244 static void opal_message_do_notify(uint32_t msg_type, void *msg) 245 { 246 /* notify subscribers */ 247 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 248 msg_type, msg); 249 } 250 251 static void opal_handle_message(void) 252 { 253 s64 ret; 254 /* 255 * TODO: pre-allocate a message buffer depending on opal-msg-size 256 * value in /proc/device-tree. 257 */ 258 static struct opal_msg msg; 259 u32 type; 260 261 ret = opal_get_msg(__pa(&msg), sizeof(msg)); 262 /* No opal message pending. */ 263 if (ret == OPAL_RESOURCE) 264 return; 265 266 /* check for errors. */ 267 if (ret) { 268 pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 269 __func__, ret); 270 return; 271 } 272 273 type = be32_to_cpu(msg.msg_type); 274 275 /* Sanity check */ 276 if (type >= OPAL_MSG_TYPE_MAX) { 277 pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 278 return; 279 } 280 opal_message_do_notify(type, (void *)&msg); 281 } 282 283 static irqreturn_t opal_message_notify(int irq, void *data) 284 { 285 opal_handle_message(); 286 return IRQ_HANDLED; 287 } 288 289 static int __init opal_message_init(void) 290 { 291 int ret, i, irq; 292 293 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 294 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 295 296 irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 297 if (!irq) { 298 pr_err("%s: Can't register OPAL event irq (%d)\n", 299 __func__, irq); 300 return irq; 301 } 302 303 ret = request_irq(irq, opal_message_notify, 304 IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 305 if (ret) { 306 pr_err("%s: Can't request OPAL event irq (%d)\n", 307 __func__, ret); 308 return ret; 309 } 310 311 return 0; 312 } 313 314 int opal_get_chars(uint32_t vtermno, char *buf, int count) 315 { 316 s64 rc; 317 __be64 evt, len; 318 319 if (!opal.entry) 320 return -ENODEV; 321 opal_poll_events(&evt); 322 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 323 return 0; 324 len = cpu_to_be64(count); 325 rc = opal_console_read(vtermno, &len, buf); 326 if (rc == OPAL_SUCCESS) 327 return be64_to_cpu(len); 328 return 0; 329 } 330 331 int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 332 { 333 int written = 0; 334 __be64 olen; 335 s64 len, rc; 336 unsigned long flags; 337 __be64 evt; 338 339 if (!opal.entry) 340 return -ENODEV; 341 342 /* We want put_chars to be atomic to avoid mangling of hvsi 343 * packets. To do that, we first test for room and return 344 * -EAGAIN if there isn't enough. 345 * 346 * Unfortunately, opal_console_write_buffer_space() doesn't 347 * appear to work on opal v1, so we just assume there is 348 * enough room and be done with it 349 */ 350 spin_lock_irqsave(&opal_write_lock, flags); 351 rc = opal_console_write_buffer_space(vtermno, &olen); 352 len = be64_to_cpu(olen); 353 if (rc || len < total_len) { 354 spin_unlock_irqrestore(&opal_write_lock, flags); 355 /* Closed -> drop characters */ 356 if (rc) 357 return total_len; 358 opal_poll_events(NULL); 359 return -EAGAIN; 360 } 361 362 /* We still try to handle partial completions, though they 363 * should no longer happen. 364 */ 365 rc = OPAL_BUSY; 366 while(total_len > 0 && (rc == OPAL_BUSY || 367 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 368 olen = cpu_to_be64(total_len); 369 rc = opal_console_write(vtermno, &olen, data); 370 len = be64_to_cpu(olen); 371 372 /* Closed or other error drop */ 373 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 374 rc != OPAL_BUSY_EVENT) { 375 written = total_len; 376 break; 377 } 378 if (rc == OPAL_SUCCESS) { 379 total_len -= len; 380 data += len; 381 written += len; 382 } 383 /* This is a bit nasty but we need that for the console to 384 * flush when there aren't any interrupts. We will clean 385 * things a bit later to limit that to synchronous path 386 * such as the kernel console and xmon/udbg 387 */ 388 do 389 opal_poll_events(&evt); 390 while(rc == OPAL_SUCCESS && 391 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 392 } 393 spin_unlock_irqrestore(&opal_write_lock, flags); 394 return written; 395 } 396 397 static int opal_recover_mce(struct pt_regs *regs, 398 struct machine_check_event *evt) 399 { 400 int recovered = 0; 401 uint64_t ea = get_mce_fault_addr(evt); 402 403 if (!(regs->msr & MSR_RI)) { 404 /* If MSR_RI isn't set, we cannot recover */ 405 recovered = 0; 406 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 407 /* Platform corrected itself */ 408 recovered = 1; 409 } else if (ea && !is_kernel_addr(ea)) { 410 /* 411 * Faulting address is not in kernel text. We should be fine. 412 * We need to find which process uses this address. 413 * For now, kill the task if we have received exception when 414 * in userspace. 415 * 416 * TODO: Queue up this address for hwpoisioning later. 417 */ 418 if (user_mode(regs) && !is_global_init(current)) { 419 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 420 recovered = 1; 421 } else 422 recovered = 0; 423 } else if (user_mode(regs) && !is_global_init(current) && 424 evt->severity == MCE_SEV_ERROR_SYNC) { 425 /* 426 * If we have received a synchronous error when in userspace 427 * kill the task. 428 */ 429 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 430 recovered = 1; 431 } 432 return recovered; 433 } 434 435 int opal_machine_check(struct pt_regs *regs) 436 { 437 struct machine_check_event evt; 438 int ret; 439 440 if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 441 return 0; 442 443 /* Print things out */ 444 if (evt.version != MCE_V1) { 445 pr_err("Machine Check Exception, Unknown event version %d !\n", 446 evt.version); 447 return 0; 448 } 449 machine_check_print_event_info(&evt); 450 451 if (opal_recover_mce(regs, &evt)) 452 return 1; 453 454 /* 455 * Unrecovered machine check, we are heading to panic path. 456 * 457 * We may have hit this MCE in very early stage of kernel 458 * initialization even before opal-prd has started running. If 459 * this is the case then this MCE error may go un-noticed or 460 * un-analyzed if we go down panic path. We need to inform 461 * BMC/OCC about this error so that they can collect relevant 462 * data for error analysis before rebooting. 463 * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. 464 * This function may not return on BMC based system. 465 */ 466 ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, 467 "Unrecoverable Machine Check exception"); 468 if (ret == OPAL_UNSUPPORTED) { 469 pr_emerg("Reboot type %d not supported\n", 470 OPAL_REBOOT_PLATFORM_ERROR); 471 } 472 473 /* 474 * We reached here. There can be three possibilities: 475 * 1. We are running on a firmware level that do not support 476 * opal_cec_reboot2() 477 * 2. We are running on a firmware level that do not support 478 * OPAL_REBOOT_PLATFORM_ERROR reboot type. 479 * 3. We are running on FSP based system that does not need opal 480 * to trigger checkstop explicitly for error analysis. The FSP 481 * PRD component would have already got notified about this 482 * error through other channels. 483 * 484 * If hardware marked this as an unrecoverable MCE, we are 485 * going to panic anyway. Even if it didn't, it's not safe to 486 * continue at this point, so we should explicitly panic. 487 */ 488 489 panic("PowerNV Unrecovered Machine Check"); 490 return 0; 491 } 492 493 /* Early hmi handler called in real mode. */ 494 int opal_hmi_exception_early(struct pt_regs *regs) 495 { 496 s64 rc; 497 498 /* 499 * call opal hmi handler. Pass paca address as token. 500 * The return value OPAL_SUCCESS is an indication that there is 501 * an HMI event generated waiting to pull by Linux. 502 */ 503 rc = opal_handle_hmi(); 504 if (rc == OPAL_SUCCESS) { 505 local_paca->hmi_event_available = 1; 506 return 1; 507 } 508 return 0; 509 } 510 511 /* HMI exception handler called in virtual mode during check_irq_replay. */ 512 int opal_handle_hmi_exception(struct pt_regs *regs) 513 { 514 s64 rc; 515 __be64 evt = 0; 516 517 /* 518 * Check if HMI event is available. 519 * if Yes, then call opal_poll_events to pull opal messages and 520 * process them. 521 */ 522 if (!local_paca->hmi_event_available) 523 return 0; 524 525 local_paca->hmi_event_available = 0; 526 rc = opal_poll_events(&evt); 527 if (rc == OPAL_SUCCESS && evt) 528 opal_handle_events(be64_to_cpu(evt)); 529 530 return 1; 531 } 532 533 static uint64_t find_recovery_address(uint64_t nip) 534 { 535 int i; 536 537 for (i = 0; i < mc_recoverable_range_len; i++) 538 if ((nip >= mc_recoverable_range[i].start_addr) && 539 (nip < mc_recoverable_range[i].end_addr)) 540 return mc_recoverable_range[i].recover_addr; 541 return 0; 542 } 543 544 bool opal_mce_check_early_recovery(struct pt_regs *regs) 545 { 546 uint64_t recover_addr = 0; 547 548 if (!opal.base || !opal.size) 549 goto out; 550 551 if ((regs->nip >= opal.base) && 552 (regs->nip < (opal.base + opal.size))) 553 recover_addr = find_recovery_address(regs->nip); 554 555 /* 556 * Setup regs->nip to rfi into fixup address. 557 */ 558 if (recover_addr) 559 regs->nip = recover_addr; 560 561 out: 562 return !!recover_addr; 563 } 564 565 static int opal_sysfs_init(void) 566 { 567 opal_kobj = kobject_create_and_add("opal", firmware_kobj); 568 if (!opal_kobj) { 569 pr_warn("kobject_create_and_add opal failed\n"); 570 return -ENOMEM; 571 } 572 573 return 0; 574 } 575 576 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 577 struct bin_attribute *bin_attr, 578 char *buf, loff_t off, size_t count) 579 { 580 return memory_read_from_buffer(buf, count, &off, bin_attr->private, 581 bin_attr->size); 582 } 583 584 static BIN_ATTR_RO(symbol_map, 0); 585 586 static void opal_export_symmap(void) 587 { 588 const __be64 *syms; 589 unsigned int size; 590 struct device_node *fw; 591 int rc; 592 593 fw = of_find_node_by_path("/ibm,opal/firmware"); 594 if (!fw) 595 return; 596 syms = of_get_property(fw, "symbol-map", &size); 597 if (!syms || size != 2 * sizeof(__be64)) 598 return; 599 600 /* Setup attributes */ 601 bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 602 bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 603 604 rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 605 if (rc) 606 pr_warn("Error %d creating OPAL symbols file\n", rc); 607 } 608 609 static void __init opal_dump_region_init(void) 610 { 611 void *addr; 612 uint64_t size; 613 int rc; 614 615 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 616 return; 617 618 /* Register kernel log buffer */ 619 addr = log_buf_addr_get(); 620 if (addr == NULL) 621 return; 622 623 size = log_buf_len_get(); 624 if (size == 0) 625 return; 626 627 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 628 __pa(addr), size); 629 /* Don't warn if this is just an older OPAL that doesn't 630 * know about that call 631 */ 632 if (rc && rc != OPAL_UNSUPPORTED) 633 pr_warn("DUMP: Failed to register kernel log buffer. " 634 "rc = %d\n", rc); 635 } 636 637 static void opal_pdev_init(struct device_node *opal_node, 638 const char *compatible) 639 { 640 struct device_node *np; 641 642 for_each_child_of_node(opal_node, np) 643 if (of_device_is_compatible(np, compatible)) 644 of_platform_device_create(np, NULL, NULL); 645 } 646 647 static void opal_i2c_create_devs(void) 648 { 649 struct device_node *np; 650 651 for_each_compatible_node(np, NULL, "ibm,opal-i2c") 652 of_platform_device_create(np, NULL, NULL); 653 } 654 655 static int kopald(void *unused) 656 { 657 unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 658 __be64 events; 659 660 set_freezable(); 661 do { 662 try_to_freeze(); 663 opal_poll_events(&events); 664 opal_handle_events(be64_to_cpu(events)); 665 schedule_timeout_interruptible(timeout); 666 } while (!kthread_should_stop()); 667 668 return 0; 669 } 670 671 void opal_wake_poller(void) 672 { 673 if (kopald_tsk) 674 wake_up_process(kopald_tsk); 675 } 676 677 static void opal_init_heartbeat(void) 678 { 679 /* Old firwmware, we assume the HVC heartbeat is sufficient */ 680 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 681 &opal_heartbeat) != 0) 682 opal_heartbeat = 0; 683 684 if (opal_heartbeat) 685 kopald_tsk = kthread_run(kopald, NULL, "kopald"); 686 } 687 688 static int __init opal_init(void) 689 { 690 struct device_node *np, *consoles, *leds; 691 int rc; 692 693 opal_node = of_find_node_by_path("/ibm,opal"); 694 if (!opal_node) { 695 pr_warn("Device node not found\n"); 696 return -ENODEV; 697 } 698 699 /* Register OPAL consoles if any ports */ 700 consoles = of_find_node_by_path("/ibm,opal/consoles"); 701 if (consoles) { 702 for_each_child_of_node(consoles, np) { 703 if (strcmp(np->name, "serial")) 704 continue; 705 of_platform_device_create(np, NULL, NULL); 706 } 707 of_node_put(consoles); 708 } 709 710 /* Initialise OPAL messaging system */ 711 opal_message_init(); 712 713 /* Initialise OPAL asynchronous completion interface */ 714 opal_async_comp_init(); 715 716 /* Initialise OPAL sensor interface */ 717 opal_sensor_init(); 718 719 /* Initialise OPAL hypervisor maintainence interrupt handling */ 720 opal_hmi_handler_init(); 721 722 /* Create i2c platform devices */ 723 opal_i2c_create_devs(); 724 725 /* Setup a heatbeat thread if requested by OPAL */ 726 opal_init_heartbeat(); 727 728 /* Create leds platform devices */ 729 leds = of_find_node_by_path("/ibm,opal/leds"); 730 if (leds) { 731 of_platform_device_create(leds, "opal_leds", NULL); 732 of_node_put(leds); 733 } 734 735 /* Initialise OPAL message log interface */ 736 opal_msglog_init(); 737 738 /* Create "opal" kobject under /sys/firmware */ 739 rc = opal_sysfs_init(); 740 if (rc == 0) { 741 /* Export symbol map to userspace */ 742 opal_export_symmap(); 743 /* Setup dump region interface */ 744 opal_dump_region_init(); 745 /* Setup error log interface */ 746 rc = opal_elog_init(); 747 /* Setup code update interface */ 748 opal_flash_update_init(); 749 /* Setup platform dump extract interface */ 750 opal_platform_dump_init(); 751 /* Setup system parameters interface */ 752 opal_sys_param_init(); 753 /* Setup message log sysfs interface. */ 754 opal_msglog_sysfs_init(); 755 } 756 757 /* Initialize platform devices: IPMI backend, PRD & flash interface */ 758 opal_pdev_init(opal_node, "ibm,opal-ipmi"); 759 opal_pdev_init(opal_node, "ibm,opal-flash"); 760 opal_pdev_init(opal_node, "ibm,opal-prd"); 761 762 /* Initialise platform device: oppanel interface */ 763 opal_pdev_init(opal_node, "ibm,opal-oppanel"); 764 765 /* Initialise OPAL kmsg dumper for flushing console on panic */ 766 opal_kmsg_init(); 767 768 return 0; 769 } 770 machine_subsys_initcall(powernv, opal_init); 771 772 void opal_shutdown(void) 773 { 774 long rc = OPAL_BUSY; 775 776 opal_event_shutdown(); 777 778 /* 779 * Then sync with OPAL which ensure anything that can 780 * potentially write to our memory has completed such 781 * as an ongoing dump retrieval 782 */ 783 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 784 rc = opal_sync_host_reboot(); 785 if (rc == OPAL_BUSY) 786 opal_poll_events(NULL); 787 else 788 mdelay(10); 789 } 790 791 /* Unregister memory dump region */ 792 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 793 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 794 } 795 796 /* Export this so that test modules can use it */ 797 EXPORT_SYMBOL_GPL(opal_invalid_call); 798 EXPORT_SYMBOL_GPL(opal_xscom_read); 799 EXPORT_SYMBOL_GPL(opal_xscom_write); 800 EXPORT_SYMBOL_GPL(opal_ipmi_send); 801 EXPORT_SYMBOL_GPL(opal_ipmi_recv); 802 EXPORT_SYMBOL_GPL(opal_flash_read); 803 EXPORT_SYMBOL_GPL(opal_flash_write); 804 EXPORT_SYMBOL_GPL(opal_flash_erase); 805 EXPORT_SYMBOL_GPL(opal_prd_msg); 806 807 /* Convert a region of vmalloc memory to an opal sg list */ 808 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 809 unsigned long vmalloc_size) 810 { 811 struct opal_sg_list *sg, *first = NULL; 812 unsigned long i = 0; 813 814 sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 815 if (!sg) 816 goto nomem; 817 818 first = sg; 819 820 while (vmalloc_size > 0) { 821 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 822 uint64_t length = min(vmalloc_size, PAGE_SIZE); 823 824 sg->entry[i].data = cpu_to_be64(data); 825 sg->entry[i].length = cpu_to_be64(length); 826 i++; 827 828 if (i >= SG_ENTRIES_PER_NODE) { 829 struct opal_sg_list *next; 830 831 next = kzalloc(PAGE_SIZE, GFP_KERNEL); 832 if (!next) 833 goto nomem; 834 835 sg->length = cpu_to_be64( 836 i * sizeof(struct opal_sg_entry) + 16); 837 i = 0; 838 sg->next = cpu_to_be64(__pa(next)); 839 sg = next; 840 } 841 842 vmalloc_addr += length; 843 vmalloc_size -= length; 844 } 845 846 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 847 848 return first; 849 850 nomem: 851 pr_err("%s : Failed to allocate memory\n", __func__); 852 opal_free_sg_list(first); 853 return NULL; 854 } 855 856 void opal_free_sg_list(struct opal_sg_list *sg) 857 { 858 while (sg) { 859 uint64_t next = be64_to_cpu(sg->next); 860 861 kfree(sg); 862 863 if (next) 864 sg = __va(next); 865 else 866 sg = NULL; 867 } 868 } 869 870 int opal_error_code(int rc) 871 { 872 switch (rc) { 873 case OPAL_SUCCESS: return 0; 874 875 case OPAL_PARAMETER: return -EINVAL; 876 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 877 case OPAL_BUSY_EVENT: return -EBUSY; 878 case OPAL_NO_MEM: return -ENOMEM; 879 case OPAL_PERMISSION: return -EPERM; 880 881 case OPAL_UNSUPPORTED: return -EIO; 882 case OPAL_HARDWARE: return -EIO; 883 case OPAL_INTERNAL_ERROR: return -EIO; 884 default: 885 pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 886 return -EIO; 887 } 888 } 889 890 EXPORT_SYMBOL_GPL(opal_poll_events); 891 EXPORT_SYMBOL_GPL(opal_rtc_read); 892 EXPORT_SYMBOL_GPL(opal_rtc_write); 893 EXPORT_SYMBOL_GPL(opal_tpo_read); 894 EXPORT_SYMBOL_GPL(opal_tpo_write); 895 EXPORT_SYMBOL_GPL(opal_i2c_request); 896 /* Export these symbols for PowerNV LED class driver */ 897 EXPORT_SYMBOL_GPL(opal_leds_get_ind); 898 EXPORT_SYMBOL_GPL(opal_leds_set_ind); 899 /* Export this symbol for PowerNV Operator Panel class driver */ 900 EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 901