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