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 } 238 239 int opal_message_notifier_unregister(enum opal_msg_type msg_type, 240 struct notifier_block *nb) 241 { 242 return atomic_notifier_chain_unregister( 243 &opal_msg_notifier_head[msg_type], nb); 244 } 245 246 static void opal_message_do_notify(uint32_t msg_type, void *msg) 247 { 248 /* notify subscribers */ 249 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 250 msg_type, msg); 251 } 252 253 static void opal_handle_message(void) 254 { 255 s64 ret; 256 /* 257 * TODO: pre-allocate a message buffer depending on opal-msg-size 258 * value in /proc/device-tree. 259 */ 260 static struct opal_msg msg; 261 u32 type; 262 263 ret = opal_get_msg(__pa(&msg), sizeof(msg)); 264 /* No opal message pending. */ 265 if (ret == OPAL_RESOURCE) 266 return; 267 268 /* check for errors. */ 269 if (ret) { 270 pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 271 __func__, ret); 272 return; 273 } 274 275 type = be32_to_cpu(msg.msg_type); 276 277 /* Sanity check */ 278 if (type >= OPAL_MSG_TYPE_MAX) { 279 pr_warning("%s: Unknown message type: %u\n", __func__, type); 280 return; 281 } 282 opal_message_do_notify(type, (void *)&msg); 283 } 284 285 static irqreturn_t opal_message_notify(int irq, void *data) 286 { 287 opal_handle_message(); 288 return IRQ_HANDLED; 289 } 290 291 static int __init opal_message_init(void) 292 { 293 int ret, i, irq; 294 295 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 296 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 297 298 irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 299 if (!irq) { 300 pr_err("%s: Can't register OPAL event irq (%d)\n", 301 __func__, irq); 302 return irq; 303 } 304 305 ret = request_irq(irq, opal_message_notify, 306 IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 307 if (ret) { 308 pr_err("%s: Can't request OPAL event irq (%d)\n", 309 __func__, ret); 310 return ret; 311 } 312 313 return 0; 314 } 315 316 int opal_get_chars(uint32_t vtermno, char *buf, int count) 317 { 318 s64 rc; 319 __be64 evt, len; 320 321 if (!opal.entry) 322 return -ENODEV; 323 opal_poll_events(&evt); 324 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 325 return 0; 326 len = cpu_to_be64(count); 327 rc = opal_console_read(vtermno, &len, buf); 328 if (rc == OPAL_SUCCESS) 329 return be64_to_cpu(len); 330 return 0; 331 } 332 333 int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 334 { 335 int written = 0; 336 __be64 olen; 337 s64 len, rc; 338 unsigned long flags; 339 __be64 evt; 340 341 if (!opal.entry) 342 return -ENODEV; 343 344 /* We want put_chars to be atomic to avoid mangling of hvsi 345 * packets. To do that, we first test for room and return 346 * -EAGAIN if there isn't enough. 347 * 348 * Unfortunately, opal_console_write_buffer_space() doesn't 349 * appear to work on opal v1, so we just assume there is 350 * enough room and be done with it 351 */ 352 spin_lock_irqsave(&opal_write_lock, flags); 353 if (firmware_has_feature(FW_FEATURE_OPALv2)) { 354 rc = opal_console_write_buffer_space(vtermno, &olen); 355 len = be64_to_cpu(olen); 356 if (rc || len < total_len) { 357 spin_unlock_irqrestore(&opal_write_lock, flags); 358 /* Closed -> drop characters */ 359 if (rc) 360 return total_len; 361 opal_poll_events(NULL); 362 return -EAGAIN; 363 } 364 } 365 366 /* We still try to handle partial completions, though they 367 * should no longer happen. 368 */ 369 rc = OPAL_BUSY; 370 while(total_len > 0 && (rc == OPAL_BUSY || 371 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 372 olen = cpu_to_be64(total_len); 373 rc = opal_console_write(vtermno, &olen, data); 374 len = be64_to_cpu(olen); 375 376 /* Closed or other error drop */ 377 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 378 rc != OPAL_BUSY_EVENT) { 379 written = total_len; 380 break; 381 } 382 if (rc == OPAL_SUCCESS) { 383 total_len -= len; 384 data += len; 385 written += len; 386 } 387 /* This is a bit nasty but we need that for the console to 388 * flush when there aren't any interrupts. We will clean 389 * things a bit later to limit that to synchronous path 390 * such as the kernel console and xmon/udbg 391 */ 392 do 393 opal_poll_events(&evt); 394 while(rc == OPAL_SUCCESS && 395 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 396 } 397 spin_unlock_irqrestore(&opal_write_lock, flags); 398 return written; 399 } 400 401 static int opal_recover_mce(struct pt_regs *regs, 402 struct machine_check_event *evt) 403 { 404 int recovered = 0; 405 uint64_t ea = get_mce_fault_addr(evt); 406 407 if (!(regs->msr & MSR_RI)) { 408 /* If MSR_RI isn't set, we cannot recover */ 409 recovered = 0; 410 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 411 /* Platform corrected itself */ 412 recovered = 1; 413 } else if (ea && !is_kernel_addr(ea)) { 414 /* 415 * Faulting address is not in kernel text. We should be fine. 416 * We need to find which process uses this address. 417 * For now, kill the task if we have received exception when 418 * in userspace. 419 * 420 * TODO: Queue up this address for hwpoisioning later. 421 */ 422 if (user_mode(regs) && !is_global_init(current)) { 423 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 424 recovered = 1; 425 } else 426 recovered = 0; 427 } else if (user_mode(regs) && !is_global_init(current) && 428 evt->severity == MCE_SEV_ERROR_SYNC) { 429 /* 430 * If we have received a synchronous error when in userspace 431 * kill the task. 432 */ 433 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 434 recovered = 1; 435 } 436 return recovered; 437 } 438 439 int opal_machine_check(struct pt_regs *regs) 440 { 441 struct machine_check_event evt; 442 443 if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 444 return 0; 445 446 /* Print things out */ 447 if (evt.version != MCE_V1) { 448 pr_err("Machine Check Exception, Unknown event version %d !\n", 449 evt.version); 450 return 0; 451 } 452 machine_check_print_event_info(&evt); 453 454 if (opal_recover_mce(regs, &evt)) 455 return 1; 456 return 0; 457 } 458 459 /* Early hmi handler called in real mode. */ 460 int opal_hmi_exception_early(struct pt_regs *regs) 461 { 462 s64 rc; 463 464 /* 465 * call opal hmi handler. Pass paca address as token. 466 * The return value OPAL_SUCCESS is an indication that there is 467 * an HMI event generated waiting to pull by Linux. 468 */ 469 rc = opal_handle_hmi(); 470 if (rc == OPAL_SUCCESS) { 471 local_paca->hmi_event_available = 1; 472 return 1; 473 } 474 return 0; 475 } 476 477 /* HMI exception handler called in virtual mode during check_irq_replay. */ 478 int opal_handle_hmi_exception(struct pt_regs *regs) 479 { 480 s64 rc; 481 __be64 evt = 0; 482 483 /* 484 * Check if HMI event is available. 485 * if Yes, then call opal_poll_events to pull opal messages and 486 * process them. 487 */ 488 if (!local_paca->hmi_event_available) 489 return 0; 490 491 local_paca->hmi_event_available = 0; 492 rc = opal_poll_events(&evt); 493 if (rc == OPAL_SUCCESS && evt) 494 opal_handle_events(be64_to_cpu(evt)); 495 496 return 1; 497 } 498 499 static uint64_t find_recovery_address(uint64_t nip) 500 { 501 int i; 502 503 for (i = 0; i < mc_recoverable_range_len; i++) 504 if ((nip >= mc_recoverable_range[i].start_addr) && 505 (nip < mc_recoverable_range[i].end_addr)) 506 return mc_recoverable_range[i].recover_addr; 507 return 0; 508 } 509 510 bool opal_mce_check_early_recovery(struct pt_regs *regs) 511 { 512 uint64_t recover_addr = 0; 513 514 if (!opal.base || !opal.size) 515 goto out; 516 517 if ((regs->nip >= opal.base) && 518 (regs->nip <= (opal.base + opal.size))) 519 recover_addr = find_recovery_address(regs->nip); 520 521 /* 522 * Setup regs->nip to rfi into fixup address. 523 */ 524 if (recover_addr) 525 regs->nip = recover_addr; 526 527 out: 528 return !!recover_addr; 529 } 530 531 static int opal_sysfs_init(void) 532 { 533 opal_kobj = kobject_create_and_add("opal", firmware_kobj); 534 if (!opal_kobj) { 535 pr_warn("kobject_create_and_add opal failed\n"); 536 return -ENOMEM; 537 } 538 539 return 0; 540 } 541 542 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 543 struct bin_attribute *bin_attr, 544 char *buf, loff_t off, size_t count) 545 { 546 return memory_read_from_buffer(buf, count, &off, bin_attr->private, 547 bin_attr->size); 548 } 549 550 static BIN_ATTR_RO(symbol_map, 0); 551 552 static void opal_export_symmap(void) 553 { 554 const __be64 *syms; 555 unsigned int size; 556 struct device_node *fw; 557 int rc; 558 559 fw = of_find_node_by_path("/ibm,opal/firmware"); 560 if (!fw) 561 return; 562 syms = of_get_property(fw, "symbol-map", &size); 563 if (!syms || size != 2 * sizeof(__be64)) 564 return; 565 566 /* Setup attributes */ 567 bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 568 bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 569 570 rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 571 if (rc) 572 pr_warn("Error %d creating OPAL symbols file\n", rc); 573 } 574 575 static void __init opal_dump_region_init(void) 576 { 577 void *addr; 578 uint64_t size; 579 int rc; 580 581 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 582 return; 583 584 /* Register kernel log buffer */ 585 addr = log_buf_addr_get(); 586 if (addr == NULL) 587 return; 588 589 size = log_buf_len_get(); 590 if (size == 0) 591 return; 592 593 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 594 __pa(addr), size); 595 /* Don't warn if this is just an older OPAL that doesn't 596 * know about that call 597 */ 598 if (rc && rc != OPAL_UNSUPPORTED) 599 pr_warn("DUMP: Failed to register kernel log buffer. " 600 "rc = %d\n", rc); 601 } 602 603 static void opal_flash_init(struct device_node *opal_node) 604 { 605 struct device_node *np; 606 607 for_each_child_of_node(opal_node, np) 608 if (of_device_is_compatible(np, "ibm,opal-flash")) 609 of_platform_device_create(np, NULL, NULL); 610 } 611 612 static void opal_ipmi_init(struct device_node *opal_node) 613 { 614 struct device_node *np; 615 616 for_each_child_of_node(opal_node, np) 617 if (of_device_is_compatible(np, "ibm,opal-ipmi")) 618 of_platform_device_create(np, NULL, NULL); 619 } 620 621 static void opal_i2c_create_devs(void) 622 { 623 struct device_node *np; 624 625 for_each_compatible_node(np, NULL, "ibm,opal-i2c") 626 of_platform_device_create(np, NULL, NULL); 627 } 628 629 static int kopald(void *unused) 630 { 631 __be64 events; 632 633 set_freezable(); 634 do { 635 try_to_freeze(); 636 opal_poll_events(&events); 637 opal_handle_events(be64_to_cpu(events)); 638 msleep_interruptible(opal_heartbeat); 639 } while (!kthread_should_stop()); 640 641 return 0; 642 } 643 644 static void opal_init_heartbeat(void) 645 { 646 /* Old firwmware, we assume the HVC heartbeat is sufficient */ 647 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 648 &opal_heartbeat) != 0) 649 opal_heartbeat = 0; 650 651 if (opal_heartbeat) 652 kthread_run(kopald, NULL, "kopald"); 653 } 654 655 static int __init opal_init(void) 656 { 657 struct device_node *np, *consoles; 658 int rc; 659 660 opal_node = of_find_node_by_path("/ibm,opal"); 661 if (!opal_node) { 662 pr_warn("Device node not found\n"); 663 return -ENODEV; 664 } 665 666 /* Initialise OPAL events */ 667 opal_event_init(); 668 669 /* Register OPAL consoles if any ports */ 670 if (firmware_has_feature(FW_FEATURE_OPALv2)) 671 consoles = of_find_node_by_path("/ibm,opal/consoles"); 672 else 673 consoles = of_node_get(opal_node); 674 if (consoles) { 675 for_each_child_of_node(consoles, np) { 676 if (strcmp(np->name, "serial")) 677 continue; 678 of_platform_device_create(np, NULL, NULL); 679 } 680 of_node_put(consoles); 681 } 682 683 /* Initialise OPAL messaging system */ 684 opal_message_init(); 685 686 /* Initialise OPAL asynchronous completion interface */ 687 opal_async_comp_init(); 688 689 /* Initialise OPAL sensor interface */ 690 opal_sensor_init(); 691 692 /* Initialise OPAL hypervisor maintainence interrupt handling */ 693 opal_hmi_handler_init(); 694 695 /* Create i2c platform devices */ 696 opal_i2c_create_devs(); 697 698 /* Setup a heatbeat thread if requested by OPAL */ 699 opal_init_heartbeat(); 700 701 /* Create "opal" kobject under /sys/firmware */ 702 rc = opal_sysfs_init(); 703 if (rc == 0) { 704 /* Export symbol map to userspace */ 705 opal_export_symmap(); 706 /* Setup dump region interface */ 707 opal_dump_region_init(); 708 /* Setup error log interface */ 709 rc = opal_elog_init(); 710 /* Setup code update interface */ 711 opal_flash_update_init(); 712 /* Setup platform dump extract interface */ 713 opal_platform_dump_init(); 714 /* Setup system parameters interface */ 715 opal_sys_param_init(); 716 /* Setup message log interface. */ 717 opal_msglog_init(); 718 } 719 720 /* Initialize OPAL IPMI backend */ 721 opal_ipmi_init(opal_node); 722 723 opal_flash_init(opal_node); 724 725 return 0; 726 } 727 machine_subsys_initcall(powernv, opal_init); 728 729 void opal_shutdown(void) 730 { 731 long rc = OPAL_BUSY; 732 733 opal_event_shutdown(); 734 735 /* 736 * Then sync with OPAL which ensure anything that can 737 * potentially write to our memory has completed such 738 * as an ongoing dump retrieval 739 */ 740 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 741 rc = opal_sync_host_reboot(); 742 if (rc == OPAL_BUSY) 743 opal_poll_events(NULL); 744 else 745 mdelay(10); 746 } 747 748 /* Unregister memory dump region */ 749 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 750 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 751 } 752 753 /* Export this so that test modules can use it */ 754 EXPORT_SYMBOL_GPL(opal_invalid_call); 755 EXPORT_SYMBOL_GPL(opal_ipmi_send); 756 EXPORT_SYMBOL_GPL(opal_ipmi_recv); 757 EXPORT_SYMBOL_GPL(opal_flash_read); 758 EXPORT_SYMBOL_GPL(opal_flash_write); 759 EXPORT_SYMBOL_GPL(opal_flash_erase); 760 761 /* Convert a region of vmalloc memory to an opal sg list */ 762 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 763 unsigned long vmalloc_size) 764 { 765 struct opal_sg_list *sg, *first = NULL; 766 unsigned long i = 0; 767 768 sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 769 if (!sg) 770 goto nomem; 771 772 first = sg; 773 774 while (vmalloc_size > 0) { 775 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 776 uint64_t length = min(vmalloc_size, PAGE_SIZE); 777 778 sg->entry[i].data = cpu_to_be64(data); 779 sg->entry[i].length = cpu_to_be64(length); 780 i++; 781 782 if (i >= SG_ENTRIES_PER_NODE) { 783 struct opal_sg_list *next; 784 785 next = kzalloc(PAGE_SIZE, GFP_KERNEL); 786 if (!next) 787 goto nomem; 788 789 sg->length = cpu_to_be64( 790 i * sizeof(struct opal_sg_entry) + 16); 791 i = 0; 792 sg->next = cpu_to_be64(__pa(next)); 793 sg = next; 794 } 795 796 vmalloc_addr += length; 797 vmalloc_size -= length; 798 } 799 800 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 801 802 return first; 803 804 nomem: 805 pr_err("%s : Failed to allocate memory\n", __func__); 806 opal_free_sg_list(first); 807 return NULL; 808 } 809 810 void opal_free_sg_list(struct opal_sg_list *sg) 811 { 812 while (sg) { 813 uint64_t next = be64_to_cpu(sg->next); 814 815 kfree(sg); 816 817 if (next) 818 sg = __va(next); 819 else 820 sg = NULL; 821 } 822 } 823 824 int opal_error_code(int rc) 825 { 826 switch (rc) { 827 case OPAL_SUCCESS: return 0; 828 829 case OPAL_PARAMETER: return -EINVAL; 830 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 831 case OPAL_BUSY_EVENT: return -EBUSY; 832 case OPAL_NO_MEM: return -ENOMEM; 833 case OPAL_PERMISSION: return -EPERM; 834 835 case OPAL_UNSUPPORTED: return -EIO; 836 case OPAL_HARDWARE: return -EIO; 837 case OPAL_INTERNAL_ERROR: return -EIO; 838 default: 839 pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 840 return -EIO; 841 } 842 } 843 844 EXPORT_SYMBOL_GPL(opal_poll_events); 845 EXPORT_SYMBOL_GPL(opal_rtc_read); 846 EXPORT_SYMBOL_GPL(opal_rtc_write); 847 EXPORT_SYMBOL_GPL(opal_tpo_read); 848 EXPORT_SYMBOL_GPL(opal_tpo_write); 849 EXPORT_SYMBOL_GPL(opal_i2c_request); 850