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