1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * PowerNV OPAL high level interfaces 4 * 5 * Copyright 2011 IBM Corp. 6 */ 7 8#define pr_fmt(fmt) "opal: " fmt 9 10#include <linux/printk.h> 11#include <linux/types.h> 12#include <linux/of.h> 13#include <linux/of_fdt.h> 14#include <linux/of_platform.h> 15#include <linux/of_address.h> 16#include <linux/interrupt.h> 17#include <linux/notifier.h> 18#include <linux/slab.h> 19#include <linux/sched.h> 20#include <linux/kobject.h> 21#include <linux/delay.h> 22#include <linux/memblock.h> 23#include <linux/kthread.h> 24#include <linux/freezer.h> 25#include <linux/kmsg_dump.h> 26#include <linux/console.h> 27#include <linux/sched/debug.h> 28 29#include <asm/machdep.h> 30#include <asm/opal.h> 31#include <asm/firmware.h> 32#include <asm/mce.h> 33#include <asm/imc-pmu.h> 34#include <asm/bug.h> 35 36#include "powernv.h" 37 38#define OPAL_MSG_QUEUE_MAX 16 39 40struct opal_msg_node { 41 struct list_head list; 42 struct opal_msg msg; 43}; 44 45static DEFINE_SPINLOCK(msg_list_lock); 46static LIST_HEAD(msg_list); 47 48/* /sys/firmware/opal */ 49struct kobject *opal_kobj; 50 51struct opal { 52 u64 base; 53 u64 entry; 54 u64 size; 55} opal; 56 57struct mcheck_recoverable_range { 58 u64 start_addr; 59 u64 end_addr; 60 u64 recover_addr; 61}; 62 63static int msg_list_size; 64 65static struct mcheck_recoverable_range *mc_recoverable_range; 66static int mc_recoverable_range_len; 67 68struct device_node *opal_node; 69static DEFINE_SPINLOCK(opal_write_lock); 70static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 71static uint32_t opal_heartbeat; 72static struct task_struct *kopald_tsk; 73static struct opal_msg *opal_msg; 74static u32 opal_msg_size __ro_after_init; 75 76void __init opal_configure_cores(void) 77{ 78 u64 reinit_flags = 0; 79 80 /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 81 * 82 * It will preserve non volatile GPRs and HSPRG0/1. It will 83 * also restore HIDs and other SPRs to their original value 84 * but it might clobber a bunch. 85 */ 86#ifdef __BIG_ENDIAN__ 87 reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; 88#else 89 reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; 90#endif 91 92 /* 93 * POWER9 always support running hash: 94 * ie. Host hash supports hash guests 95 * Host radix supports hash/radix guests 96 */ 97 if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { 98 reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; 99 if (early_radix_enabled()) 100 reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; 101 } 102 103 opal_reinit_cpus(reinit_flags); 104 105 /* Restore some bits */ 106 if (cur_cpu_spec->cpu_restore) 107 cur_cpu_spec->cpu_restore(); 108} 109 110int __init early_init_dt_scan_opal(unsigned long node, 111 const char *uname, int depth, void *data) 112{ 113 const void *basep, *entryp, *sizep; 114 int basesz, entrysz, runtimesz; 115 116 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 117 return 0; 118 119 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 120 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 121 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 122 123 if (!basep || !entryp || !sizep) 124 return 1; 125 126 opal.base = of_read_number(basep, basesz/4); 127 opal.entry = of_read_number(entryp, entrysz/4); 128 opal.size = of_read_number(sizep, runtimesz/4); 129 130 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 131 opal.base, basep, basesz); 132 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 133 opal.entry, entryp, entrysz); 134 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 135 opal.size, sizep, runtimesz); 136 137 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 138 powerpc_firmware_features |= FW_FEATURE_OPAL; 139 pr_debug("OPAL detected !\n"); 140 } else { 141 panic("OPAL != V3 detected, no longer supported.\n"); 142 } 143 144 return 1; 145} 146 147int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 148 const char *uname, int depth, void *data) 149{ 150 int i, psize, size; 151 const __be32 *prop; 152 153 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 154 return 0; 155 156 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 157 158 if (!prop) 159 return 1; 160 161 pr_debug("Found machine check recoverable ranges.\n"); 162 163 /* 164 * Calculate number of available entries. 165 * 166 * Each recoverable address range entry is (start address, len, 167 * recovery address), 2 cells each for start and recovery address, 168 * 1 cell for len, totalling 5 cells per entry. 169 */ 170 mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 171 172 /* Sanity check */ 173 if (!mc_recoverable_range_len) 174 return 1; 175 176 /* Size required to hold all the entries. */ 177 size = mc_recoverable_range_len * 178 sizeof(struct mcheck_recoverable_range); 179 180 /* 181 * Allocate a buffer to hold the MC recoverable ranges. 182 */ 183 mc_recoverable_range = memblock_alloc(size, __alignof__(u64)); 184 if (!mc_recoverable_range) 185 panic("%s: Failed to allocate %u bytes align=0x%lx\n", 186 __func__, size, __alignof__(u64)); 187 188 for (i = 0; i < mc_recoverable_range_len; i++) { 189 mc_recoverable_range[i].start_addr = 190 of_read_number(prop + (i * 5) + 0, 2); 191 mc_recoverable_range[i].end_addr = 192 mc_recoverable_range[i].start_addr + 193 of_read_number(prop + (i * 5) + 2, 1); 194 mc_recoverable_range[i].recover_addr = 195 of_read_number(prop + (i * 5) + 3, 2); 196 197 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 198 mc_recoverable_range[i].start_addr, 199 mc_recoverable_range[i].end_addr, 200 mc_recoverable_range[i].recover_addr); 201 } 202 return 1; 203} 204 205static int __init opal_register_exception_handlers(void) 206{ 207#ifdef __BIG_ENDIAN__ 208 u64 glue; 209 210 if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 211 return -ENODEV; 212 213 /* Hookup some exception handlers except machine check. We use the 214 * fwnmi area at 0x7000 to provide the glue space to OPAL 215 */ 216 glue = 0x7000; 217 218 /* 219 * Only ancient OPAL firmware requires this. 220 * Specifically, firmware from FW810.00 (released June 2014) 221 * through FW810.20 (Released October 2014). 222 * 223 * Check if we are running on newer (post Oct 2014) firmware that 224 * exports the OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to 225 * patch the HMI interrupt and we catch it directly in Linux. 226 * 227 * For older firmware (i.e < FW810.20), we fallback to old behavior and 228 * let OPAL patch the HMI vector and handle it inside OPAL firmware. 229 * 230 * For newer firmware we catch/handle the HMI directly in Linux. 231 */ 232 if (!opal_check_token(OPAL_HANDLE_HMI)) { 233 pr_info("Old firmware detected, OPAL handles HMIs.\n"); 234 opal_register_exception_handler( 235 OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 236 0, glue); 237 glue += 128; 238 } 239 240 /* 241 * Only applicable to ancient firmware, all modern 242 * (post March 2015/skiboot 5.0) firmware will just return 243 * OPAL_UNSUPPORTED. 244 */ 245 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 246#endif 247 248 return 0; 249} 250machine_early_initcall(powernv, opal_register_exception_handlers); 251 252static void queue_replay_msg(void *msg) 253{ 254 struct opal_msg_node *msg_node; 255 256 if (msg_list_size < OPAL_MSG_QUEUE_MAX) { 257 msg_node = kzalloc(sizeof(*msg_node), GFP_ATOMIC); 258 if (msg_node) { 259 INIT_LIST_HEAD(&msg_node->list); 260 memcpy(&msg_node->msg, msg, sizeof(struct opal_msg)); 261 list_add_tail(&msg_node->list, &msg_list); 262 msg_list_size++; 263 } else 264 pr_warn_once("message queue no memory\n"); 265 266 if (msg_list_size >= OPAL_MSG_QUEUE_MAX) 267 pr_warn_once("message queue full\n"); 268 } 269} 270 271static void dequeue_replay_msg(enum opal_msg_type msg_type) 272{ 273 struct opal_msg_node *msg_node, *tmp; 274 275 list_for_each_entry_safe(msg_node, tmp, &msg_list, list) { 276 if (be32_to_cpu(msg_node->msg.msg_type) != msg_type) 277 continue; 278 279 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 280 msg_type, 281 &msg_node->msg); 282 283 list_del(&msg_node->list); 284 kfree(msg_node); 285 msg_list_size--; 286 } 287} 288 289/* 290 * Opal message notifier based on message type. Allow subscribers to get 291 * notified for specific messgae type. 292 */ 293int opal_message_notifier_register(enum opal_msg_type msg_type, 294 struct notifier_block *nb) 295{ 296 int ret; 297 unsigned long flags; 298 299 if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 300 pr_warn("%s: Invalid arguments, msg_type:%d\n", 301 __func__, msg_type); 302 return -EINVAL; 303 } 304 305 spin_lock_irqsave(&msg_list_lock, flags); 306 ret = atomic_notifier_chain_register( 307 &opal_msg_notifier_head[msg_type], nb); 308 309 /* 310 * If the registration succeeded, replay any queued messages that came 311 * in prior to the notifier chain registration. msg_list_lock held here 312 * to ensure they're delivered prior to any subsequent messages. 313 */ 314 if (ret == 0) 315 dequeue_replay_msg(msg_type); 316 317 spin_unlock_irqrestore(&msg_list_lock, flags); 318 319 return ret; 320} 321EXPORT_SYMBOL_GPL(opal_message_notifier_register); 322 323int opal_message_notifier_unregister(enum opal_msg_type msg_type, 324 struct notifier_block *nb) 325{ 326 return atomic_notifier_chain_unregister( 327 &opal_msg_notifier_head[msg_type], nb); 328} 329EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 330 331static void opal_message_do_notify(uint32_t msg_type, void *msg) 332{ 333 unsigned long flags; 334 bool queued = false; 335 336 spin_lock_irqsave(&msg_list_lock, flags); 337 if (opal_msg_notifier_head[msg_type].head == NULL) { 338 /* 339 * Queue up the msg since no notifiers have registered 340 * yet for this msg_type. 341 */ 342 queue_replay_msg(msg); 343 queued = true; 344 } 345 spin_unlock_irqrestore(&msg_list_lock, flags); 346 347 if (queued) 348 return; 349 350 /* notify subscribers */ 351 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 352 msg_type, msg); 353} 354 355static void opal_handle_message(void) 356{ 357 s64 ret; 358 u32 type; 359 360 ret = opal_get_msg(__pa(opal_msg), opal_msg_size); 361 /* No opal message pending. */ 362 if (ret == OPAL_RESOURCE) 363 return; 364 365 /* check for errors. */ 366 if (ret) { 367 pr_warn("%s: Failed to retrieve opal message, err=%lld\n", 368 __func__, ret); 369 return; 370 } 371 372 type = be32_to_cpu(opal_msg->msg_type); 373 374 /* Sanity check */ 375 if (type >= OPAL_MSG_TYPE_MAX) { 376 pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 377 return; 378 } 379 opal_message_do_notify(type, (void *)opal_msg); 380} 381 382static irqreturn_t opal_message_notify(int irq, void *data) 383{ 384 opal_handle_message(); 385 return IRQ_HANDLED; 386} 387 388static int __init opal_message_init(struct device_node *opal_node) 389{ 390 int ret, i, irq; 391 392 ret = of_property_read_u32(opal_node, "opal-msg-size", &opal_msg_size); 393 if (ret) { 394 pr_notice("Failed to read opal-msg-size property\n"); 395 opal_msg_size = sizeof(struct opal_msg); 396 } 397 398 opal_msg = kmalloc(opal_msg_size, GFP_KERNEL); 399 if (!opal_msg) { 400 opal_msg_size = sizeof(struct opal_msg); 401 /* Try to allocate fixed message size */ 402 opal_msg = kmalloc(opal_msg_size, GFP_KERNEL); 403 BUG_ON(opal_msg == NULL); 404 } 405 406 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 407 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 408 409 irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 410 if (!irq) { 411 pr_err("%s: Can't register OPAL event irq (%d)\n", 412 __func__, irq); 413 return irq; 414 } 415 416 ret = request_irq(irq, opal_message_notify, 417 IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 418 if (ret) { 419 pr_err("%s: Can't request OPAL event irq (%d)\n", 420 __func__, ret); 421 return ret; 422 } 423 424 return 0; 425} 426 427ssize_t opal_get_chars(uint32_t vtermno, u8 *buf, size_t count) 428{ 429 s64 rc; 430 __be64 evt, len; 431 432 if (!opal.entry) 433 return -ENODEV; 434 opal_poll_events(&evt); 435 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 436 return 0; 437 len = cpu_to_be64(count); 438 rc = opal_console_read(vtermno, &len, buf); 439 if (rc == OPAL_SUCCESS) 440 return be64_to_cpu(len); 441 return 0; 442} 443 444static ssize_t __opal_put_chars(uint32_t vtermno, const u8 *data, 445 size_t total_len, bool atomic) 446{ 447 unsigned long flags = 0 /* shut up gcc */; 448 ssize_t written; 449 __be64 olen; 450 s64 rc; 451 452 if (!opal.entry) 453 return -ENODEV; 454 455 if (atomic) 456 spin_lock_irqsave(&opal_write_lock, flags); 457 rc = opal_console_write_buffer_space(vtermno, &olen); 458 if (rc || be64_to_cpu(olen) < total_len) { 459 /* Closed -> drop characters */ 460 if (rc) 461 written = total_len; 462 else 463 written = -EAGAIN; 464 goto out; 465 } 466 467 /* Should not get a partial write here because space is available. */ 468 olen = cpu_to_be64(total_len); 469 rc = opal_console_write(vtermno, &olen, data); 470 if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 471 if (rc == OPAL_BUSY_EVENT) 472 opal_poll_events(NULL); 473 written = -EAGAIN; 474 goto out; 475 } 476 477 /* Closed or other error drop */ 478 if (rc != OPAL_SUCCESS) { 479 written = opal_error_code(rc); 480 goto out; 481 } 482 483 written = be64_to_cpu(olen); 484 if (written < total_len) { 485 if (atomic) { 486 /* Should not happen */ 487 pr_warn("atomic console write returned partial " 488 "len=%zu written=%zd\n", total_len, written); 489 } 490 if (!written) 491 written = -EAGAIN; 492 } 493 494out: 495 if (atomic) 496 spin_unlock_irqrestore(&opal_write_lock, flags); 497 498 return written; 499} 500 501ssize_t opal_put_chars(uint32_t vtermno, const u8 *data, size_t total_len) 502{ 503 return __opal_put_chars(vtermno, data, total_len, false); 504} 505 506/* 507 * opal_put_chars_atomic will not perform partial-writes. Data will be 508 * atomically written to the terminal or not at all. This is not strictly 509 * true at the moment because console space can race with OPAL's console 510 * writes. 511 */ 512ssize_t opal_put_chars_atomic(uint32_t vtermno, const u8 *data, 513 size_t total_len) 514{ 515 return __opal_put_chars(vtermno, data, total_len, true); 516} 517 518static s64 __opal_flush_console(uint32_t vtermno) 519{ 520 s64 rc; 521 522 if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { 523 __be64 evt; 524 525 /* 526 * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, 527 * the console can still be flushed by calling the polling 528 * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. 529 */ 530 WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); 531 532 opal_poll_events(&evt); 533 if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)) 534 return OPAL_SUCCESS; 535 return OPAL_BUSY; 536 537 } else { 538 rc = opal_console_flush(vtermno); 539 if (rc == OPAL_BUSY_EVENT) { 540 opal_poll_events(NULL); 541 rc = OPAL_BUSY; 542 } 543 return rc; 544 } 545 546} 547 548/* 549 * opal_flush_console spins until the console is flushed 550 */ 551int opal_flush_console(uint32_t vtermno) 552{ 553 for (;;) { 554 s64 rc = __opal_flush_console(vtermno); 555 556 if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 557 mdelay(1); 558 continue; 559 } 560 561 return opal_error_code(rc); 562 } 563} 564 565/* 566 * opal_flush_chars is an hvc interface that sleeps until the console is 567 * flushed if wait, otherwise it will return -EBUSY if the console has data, 568 * -EAGAIN if it has data and some of it was flushed. 569 */ 570int opal_flush_chars(uint32_t vtermno, bool wait) 571{ 572 for (;;) { 573 s64 rc = __opal_flush_console(vtermno); 574 575 if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 576 if (wait) { 577 msleep(OPAL_BUSY_DELAY_MS); 578 continue; 579 } 580 if (rc == OPAL_PARTIAL) 581 return -EAGAIN; 582 } 583 584 return opal_error_code(rc); 585 } 586} 587 588static int opal_recover_mce(struct pt_regs *regs, 589 struct machine_check_event *evt) 590{ 591 int recovered = 0; 592 593 if (regs_is_unrecoverable(regs)) { 594 /* If MSR_RI isn't set, we cannot recover */ 595 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 596 recovered = 0; 597 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 598 /* Platform corrected itself */ 599 recovered = 1; 600 } else if (evt->severity == MCE_SEV_FATAL) { 601 /* Fatal machine check */ 602 pr_err("Machine check interrupt is fatal\n"); 603 recovered = 0; 604 } 605 606 if (!recovered && evt->sync_error) { 607 /* 608 * Try to kill processes if we get a synchronous machine check 609 * (e.g., one caused by execution of this instruction). This 610 * will devolve into a panic if we try to kill init or are in 611 * an interrupt etc. 612 * 613 * TODO: Queue up this address for hwpoisioning later. 614 * TODO: This is not quite right for d-side machine 615 * checks ->nip is not necessarily the important 616 * address. 617 */ 618 if ((user_mode(regs))) { 619 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 620 recovered = 1; 621 } else if (die_will_crash()) { 622 /* 623 * die() would kill the kernel, so better to go via 624 * the platform reboot code that will log the 625 * machine check. 626 */ 627 recovered = 0; 628 } else { 629 die_mce("Machine check", regs, SIGBUS); 630 recovered = 1; 631 } 632 } 633 634 return recovered; 635} 636 637void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) 638{ 639 panic_flush_kmsg_start(); 640 641 pr_emerg("Hardware platform error: %s\n", msg); 642 if (regs) 643 show_regs(regs); 644 smp_send_stop(); 645 646 panic_flush_kmsg_end(); 647 648 /* 649 * Don't bother to shut things down because this will 650 * xstop the system. 651 */ 652 if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) 653 == OPAL_UNSUPPORTED) { 654 pr_emerg("Reboot type %d not supported for %s\n", 655 OPAL_REBOOT_PLATFORM_ERROR, msg); 656 } 657 658 /* 659 * We reached here. There can be three possibilities: 660 * 1. We are running on a firmware level that do not support 661 * opal_cec_reboot2() 662 * 2. We are running on a firmware level that do not support 663 * OPAL_REBOOT_PLATFORM_ERROR reboot type. 664 * 3. We are running on FSP based system that does not need 665 * opal to trigger checkstop explicitly for error analysis. 666 * The FSP PRD component would have already got notified 667 * about this error through other channels. 668 * 4. We are running on a newer skiboot that by default does 669 * not cause a checkstop, drops us back to the kernel to 670 * extract context and state at the time of the error. 671 */ 672 673 panic(msg); 674} 675 676int opal_machine_check(struct pt_regs *regs) 677{ 678 struct machine_check_event evt; 679 680 if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 681 return 0; 682 683 /* Print things out */ 684 if (evt.version != MCE_V1) { 685 pr_err("Machine Check Exception, Unknown event version %d !\n", 686 evt.version); 687 return 0; 688 } 689 machine_check_print_event_info(&evt, user_mode(regs), false); 690 691 if (opal_recover_mce(regs, &evt)) 692 return 1; 693 694 pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); 695} 696 697/* Early hmi handler called in real mode. */ 698int opal_hmi_exception_early(struct pt_regs *regs) 699{ 700 s64 rc; 701 702 /* 703 * call opal hmi handler. Pass paca address as token. 704 * The return value OPAL_SUCCESS is an indication that there is 705 * an HMI event generated waiting to pull by Linux. 706 */ 707 rc = opal_handle_hmi(); 708 if (rc == OPAL_SUCCESS) { 709 local_paca->hmi_event_available = 1; 710 return 1; 711 } 712 return 0; 713} 714 715int opal_hmi_exception_early2(struct pt_regs *regs) 716{ 717 s64 rc; 718 __be64 out_flags; 719 720 /* 721 * call opal hmi handler. 722 * Check 64-bit flag mask to find out if an event was generated, 723 * and whether TB is still valid or not etc. 724 */ 725 rc = opal_handle_hmi2(&out_flags); 726 if (rc != OPAL_SUCCESS) 727 return 0; 728 729 if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_NEW_EVENT) 730 local_paca->hmi_event_available = 1; 731 if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL) 732 tb_invalid = true; 733 return 1; 734} 735 736/* HMI exception handler called in virtual mode when irqs are next enabled. */ 737int opal_handle_hmi_exception(struct pt_regs *regs) 738{ 739 /* 740 * Check if HMI event is available. 741 * if Yes, then wake kopald to process them. 742 */ 743 if (!local_paca->hmi_event_available) 744 return 0; 745 746 local_paca->hmi_event_available = 0; 747 opal_wake_poller(); 748 749 return 1; 750} 751 752static uint64_t find_recovery_address(uint64_t nip) 753{ 754 int i; 755 756 for (i = 0; i < mc_recoverable_range_len; i++) 757 if ((nip >= mc_recoverable_range[i].start_addr) && 758 (nip < mc_recoverable_range[i].end_addr)) 759 return mc_recoverable_range[i].recover_addr; 760 return 0; 761} 762 763bool opal_mce_check_early_recovery(struct pt_regs *regs) 764{ 765 uint64_t recover_addr = 0; 766 767 if (!opal.base || !opal.size) 768 goto out; 769 770 if ((regs->nip >= opal.base) && 771 (regs->nip < (opal.base + opal.size))) 772 recover_addr = find_recovery_address(regs->nip); 773 774 /* 775 * Setup regs->nip to rfi into fixup address. 776 */ 777 if (recover_addr) 778 regs_set_return_ip(regs, recover_addr); 779 780out: 781 return !!recover_addr; 782} 783 784static int __init opal_sysfs_init(void) 785{ 786 opal_kobj = kobject_create_and_add("opal", firmware_kobj); 787 if (!opal_kobj) { 788 pr_warn("kobject_create_and_add opal failed\n"); 789 return -ENOMEM; 790 } 791 792 return 0; 793} 794 795static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 796 struct bin_attribute *bin_attr, char *buf, 797 loff_t off, size_t count) 798{ 799 return memory_read_from_buffer(buf, count, &off, bin_attr->private, 800 bin_attr->size); 801} 802 803static int opal_add_one_export(struct kobject *parent, const char *export_name, 804 struct device_node *np, const char *prop_name) 805{ 806 struct bin_attribute *attr = NULL; 807 const char *name = NULL; 808 u64 vals[2]; 809 int rc; 810 811 rc = of_property_read_u64_array(np, prop_name, &vals[0], 2); 812 if (rc) 813 goto out; 814 815 attr = kzalloc(sizeof(*attr), GFP_KERNEL); 816 if (!attr) { 817 rc = -ENOMEM; 818 goto out; 819 } 820 name = kstrdup(export_name, GFP_KERNEL); 821 if (!name) { 822 rc = -ENOMEM; 823 goto out; 824 } 825 826 sysfs_bin_attr_init(attr); 827 attr->attr.name = name; 828 attr->attr.mode = 0400; 829 attr->read = export_attr_read; 830 attr->private = __va(vals[0]); 831 attr->size = vals[1]; 832 833 rc = sysfs_create_bin_file(parent, attr); 834out: 835 if (rc) { 836 kfree(name); 837 kfree(attr); 838 } 839 840 return rc; 841} 842 843static void opal_add_exported_attrs(struct device_node *np, 844 struct kobject *kobj) 845{ 846 struct device_node *child; 847 struct property *prop; 848 849 for_each_property_of_node(np, prop) { 850 int rc; 851 852 if (!strcmp(prop->name, "name") || 853 !strcmp(prop->name, "phandle")) 854 continue; 855 856 rc = opal_add_one_export(kobj, prop->name, np, prop->name); 857 if (rc) { 858 pr_warn("Unable to add export %pOF/%s, rc = %d!\n", 859 np, prop->name, rc); 860 } 861 } 862 863 for_each_child_of_node(np, child) { 864 struct kobject *child_kobj; 865 866 child_kobj = kobject_create_and_add(child->name, kobj); 867 if (!child_kobj) { 868 pr_err("Unable to create export dir for %pOF\n", child); 869 continue; 870 } 871 872 opal_add_exported_attrs(child, child_kobj); 873 } 874} 875 876/* 877 * opal_export_attrs: creates a sysfs node for each property listed in 878 * the device-tree under /ibm,opal/firmware/exports/ 879 * All new sysfs nodes are created under /opal/exports/. 880 * This allows for reserved memory regions (e.g. HDAT) to be read. 881 * The new sysfs nodes are only readable by root. 882 */ 883static void opal_export_attrs(void) 884{ 885 struct device_node *np; 886 struct kobject *kobj; 887 int rc; 888 889 np = of_find_node_by_path("/ibm,opal/firmware/exports"); 890 if (!np) 891 return; 892 893 /* Create new 'exports' directory - /sys/firmware/opal/exports */ 894 kobj = kobject_create_and_add("exports", opal_kobj); 895 if (!kobj) { 896 pr_warn("kobject_create_and_add() of exports failed\n"); 897 of_node_put(np); 898 return; 899 } 900 901 opal_add_exported_attrs(np, kobj); 902 903 /* 904 * NB: symbol_map existed before the generic export interface so it 905 * lives under the top level opal_kobj. 906 */ 907 rc = opal_add_one_export(opal_kobj, "symbol_map", 908 np->parent, "symbol-map"); 909 if (rc) 910 pr_warn("Error %d creating OPAL symbols file\n", rc); 911 912 of_node_put(np); 913} 914 915static void __init opal_dump_region_init(void) 916{ 917 void *addr; 918 uint64_t size; 919 int rc; 920 921 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 922 return; 923 924 /* Register kernel log buffer */ 925 addr = log_buf_addr_get(); 926 if (addr == NULL) 927 return; 928 929 size = log_buf_len_get(); 930 if (size == 0) 931 return; 932 933 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 934 __pa(addr), size); 935 /* Don't warn if this is just an older OPAL that doesn't 936 * know about that call 937 */ 938 if (rc && rc != OPAL_UNSUPPORTED) 939 pr_warn("DUMP: Failed to register kernel log buffer. " 940 "rc = %d\n", rc); 941} 942 943static void __init opal_pdev_init(const char *compatible) 944{ 945 struct device_node *np; 946 947 for_each_compatible_node(np, NULL, compatible) 948 of_platform_device_create(np, NULL, NULL); 949} 950 951static void __init opal_imc_init_dev(void) 952{ 953 struct device_node *np; 954 955 np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 956 if (np) 957 of_platform_device_create(np, NULL, NULL); 958 959 of_node_put(np); 960} 961 962static int kopald(void *unused) 963{ 964 unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 965 966 set_freezable(); 967 do { 968 try_to_freeze(); 969 970 opal_handle_events(); 971 972 set_current_state(TASK_INTERRUPTIBLE); 973 if (opal_have_pending_events()) 974 __set_current_state(TASK_RUNNING); 975 else 976 schedule_timeout(timeout); 977 978 } while (!kthread_should_stop()); 979 980 return 0; 981} 982 983void opal_wake_poller(void) 984{ 985 if (kopald_tsk) 986 wake_up_process(kopald_tsk); 987} 988 989static void __init opal_init_heartbeat(void) 990{ 991 /* Old firwmware, we assume the HVC heartbeat is sufficient */ 992 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 993 &opal_heartbeat) != 0) 994 opal_heartbeat = 0; 995 996 if (opal_heartbeat) 997 kopald_tsk = kthread_run(kopald, NULL, "kopald"); 998} 999 1000static int __init opal_init(void) 1001{ 1002 struct device_node *np, *consoles, *leds; 1003 int rc; 1004 1005 opal_node = of_find_node_by_path("/ibm,opal"); 1006 if (!opal_node) { 1007 pr_warn("Device node not found\n"); 1008 return -ENODEV; 1009 } 1010 1011 /* Register OPAL consoles if any ports */ 1012 consoles = of_find_node_by_path("/ibm,opal/consoles"); 1013 if (consoles) { 1014 for_each_child_of_node(consoles, np) { 1015 if (!of_node_name_eq(np, "serial")) 1016 continue; 1017 of_platform_device_create(np, NULL, NULL); 1018 } 1019 of_node_put(consoles); 1020 } 1021 1022 /* Initialise OPAL messaging system */ 1023 opal_message_init(opal_node); 1024 1025 /* Initialise OPAL asynchronous completion interface */ 1026 opal_async_comp_init(); 1027 1028 /* Initialise OPAL sensor interface */ 1029 opal_sensor_init(); 1030 1031 /* Initialise OPAL hypervisor maintainence interrupt handling */ 1032 opal_hmi_handler_init(); 1033 1034 /* Create i2c platform devices */ 1035 opal_pdev_init("ibm,opal-i2c"); 1036 1037 /* Handle non-volatile memory devices */ 1038 opal_pdev_init("pmem-region"); 1039 1040 /* Setup a heatbeat thread if requested by OPAL */ 1041 opal_init_heartbeat(); 1042 1043 /* Detect In-Memory Collection counters and create devices*/ 1044 opal_imc_init_dev(); 1045 1046 /* Create leds platform devices */ 1047 leds = of_find_node_by_path("/ibm,opal/leds"); 1048 if (leds) { 1049 of_platform_device_create(leds, "opal_leds", NULL); 1050 of_node_put(leds); 1051 } 1052 1053 /* Initialise OPAL message log interface */ 1054 opal_msglog_init(); 1055 1056 /* Create "opal" kobject under /sys/firmware */ 1057 rc = opal_sysfs_init(); 1058 if (rc == 0) { 1059 /* Setup dump region interface */ 1060 opal_dump_region_init(); 1061 /* Setup error log interface */ 1062 rc = opal_elog_init(); 1063 /* Setup code update interface */ 1064 opal_flash_update_init(); 1065 /* Setup platform dump extract interface */ 1066 opal_platform_dump_init(); 1067 /* Setup system parameters interface */ 1068 opal_sys_param_init(); 1069 /* Setup message log sysfs interface. */ 1070 opal_msglog_sysfs_init(); 1071 /* Add all export properties*/ 1072 opal_export_attrs(); 1073 } 1074 1075 /* Initialize platform devices: IPMI backend, PRD & flash interface */ 1076 opal_pdev_init("ibm,opal-ipmi"); 1077 opal_pdev_init("ibm,opal-flash"); 1078 opal_pdev_init("ibm,opal-prd"); 1079 1080 /* Initialise platform device: oppanel interface */ 1081 opal_pdev_init("ibm,opal-oppanel"); 1082 1083 /* Initialise OPAL kmsg dumper for flushing console on panic */ 1084 opal_kmsg_init(); 1085 1086 /* Initialise OPAL powercap interface */ 1087 opal_powercap_init(); 1088 1089 /* Initialise OPAL Power-Shifting-Ratio interface */ 1090 opal_psr_init(); 1091 1092 /* Initialise OPAL sensor groups */ 1093 opal_sensor_groups_init(); 1094 1095 /* Initialise OPAL Power control interface */ 1096 opal_power_control_init(); 1097 1098 /* Initialize OPAL secure variables */ 1099 opal_pdev_init("ibm,secvar-backend"); 1100 1101 return 0; 1102} 1103machine_subsys_initcall(powernv, opal_init); 1104 1105void opal_shutdown(void) 1106{ 1107 long rc = OPAL_BUSY; 1108 1109 opal_event_shutdown(); 1110 1111 /* 1112 * Then sync with OPAL which ensure anything that can 1113 * potentially write to our memory has completed such 1114 * as an ongoing dump retrieval 1115 */ 1116 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 1117 rc = opal_sync_host_reboot(); 1118 if (rc == OPAL_BUSY) 1119 opal_poll_events(NULL); 1120 else 1121 mdelay(10); 1122 } 1123 1124 /* Unregister memory dump region */ 1125 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 1126 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 1127} 1128 1129/* Export this so that test modules can use it */ 1130EXPORT_SYMBOL_GPL(opal_invalid_call); 1131EXPORT_SYMBOL_GPL(opal_xscom_read); 1132EXPORT_SYMBOL_GPL(opal_xscom_write); 1133EXPORT_SYMBOL_GPL(opal_ipmi_send); 1134EXPORT_SYMBOL_GPL(opal_ipmi_recv); 1135EXPORT_SYMBOL_GPL(opal_flash_read); 1136EXPORT_SYMBOL_GPL(opal_flash_write); 1137EXPORT_SYMBOL_GPL(opal_flash_erase); 1138EXPORT_SYMBOL_GPL(opal_prd_msg); 1139EXPORT_SYMBOL_GPL(opal_check_token); 1140 1141/* Convert a region of vmalloc memory to an opal sg list */ 1142struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 1143 unsigned long vmalloc_size) 1144{ 1145 struct opal_sg_list *sg, *first = NULL; 1146 unsigned long i = 0; 1147 1148 sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 1149 if (!sg) 1150 goto nomem; 1151 1152 first = sg; 1153 1154 while (vmalloc_size > 0) { 1155 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 1156 uint64_t length = min(vmalloc_size, PAGE_SIZE); 1157 1158 sg->entry[i].data = cpu_to_be64(data); 1159 sg->entry[i].length = cpu_to_be64(length); 1160 i++; 1161 1162 if (i >= SG_ENTRIES_PER_NODE) { 1163 struct opal_sg_list *next; 1164 1165 next = kzalloc(PAGE_SIZE, GFP_KERNEL); 1166 if (!next) 1167 goto nomem; 1168 1169 sg->length = cpu_to_be64( 1170 i * sizeof(struct opal_sg_entry) + 16); 1171 i = 0; 1172 sg->next = cpu_to_be64(__pa(next)); 1173 sg = next; 1174 } 1175 1176 vmalloc_addr += length; 1177 vmalloc_size -= length; 1178 } 1179 1180 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 1181 1182 return first; 1183 1184nomem: 1185 pr_err("%s : Failed to allocate memory\n", __func__); 1186 opal_free_sg_list(first); 1187 return NULL; 1188} 1189 1190void opal_free_sg_list(struct opal_sg_list *sg) 1191{ 1192 while (sg) { 1193 uint64_t next = be64_to_cpu(sg->next); 1194 1195 kfree(sg); 1196 1197 if (next) 1198 sg = __va(next); 1199 else 1200 sg = NULL; 1201 } 1202} 1203 1204int opal_error_code(int rc) 1205{ 1206 switch (rc) { 1207 case OPAL_SUCCESS: return 0; 1208 1209 case OPAL_PARAMETER: return -EINVAL; 1210 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 1211 case OPAL_BUSY: 1212 case OPAL_BUSY_EVENT: return -EBUSY; 1213 case OPAL_NO_MEM: return -ENOMEM; 1214 case OPAL_PERMISSION: return -EPERM; 1215 1216 case OPAL_UNSUPPORTED: return -EIO; 1217 case OPAL_HARDWARE: return -EIO; 1218 case OPAL_INTERNAL_ERROR: return -EIO; 1219 case OPAL_TIMEOUT: return -ETIMEDOUT; 1220 default: 1221 pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 1222 return -EIO; 1223 } 1224} 1225 1226void powernv_set_nmmu_ptcr(unsigned long ptcr) 1227{ 1228 int rc; 1229 1230 if (firmware_has_feature(FW_FEATURE_OPAL)) { 1231 rc = opal_nmmu_set_ptcr(-1UL, ptcr); 1232 if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 1233 pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 1234 } 1235} 1236 1237EXPORT_SYMBOL_GPL(opal_poll_events); 1238EXPORT_SYMBOL_GPL(opal_rtc_read); 1239EXPORT_SYMBOL_GPL(opal_rtc_write); 1240EXPORT_SYMBOL_GPL(opal_tpo_read); 1241EXPORT_SYMBOL_GPL(opal_tpo_write); 1242EXPORT_SYMBOL_GPL(opal_i2c_request); 1243/* Export these symbols for PowerNV LED class driver */ 1244EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1245EXPORT_SYMBOL_GPL(opal_leds_set_ind); 1246/* Export this symbol for PowerNV Operator Panel class driver */ 1247EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1248/* Export this for KVM */ 1249EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 1250EXPORT_SYMBOL_GPL(opal_int_eoi); 1251EXPORT_SYMBOL_GPL(opal_error_code); 1252/* Export the below symbol for NX compression */ 1253EXPORT_SYMBOL(opal_nx_coproc_init); 1254