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/of_address.h> 20 #include <linux/interrupt.h> 21 #include <linux/notifier.h> 22 #include <linux/slab.h> 23 #include <linux/sched.h> 24 #include <linux/kobject.h> 25 #include <linux/delay.h> 26 #include <linux/memblock.h> 27 #include <linux/kthread.h> 28 #include <linux/freezer.h> 29 #include <linux/printk.h> 30 #include <linux/kmsg_dump.h> 31 #include <linux/console.h> 32 #include <linux/sched/debug.h> 33 34 #include <asm/machdep.h> 35 #include <asm/opal.h> 36 #include <asm/firmware.h> 37 #include <asm/mce.h> 38 #include <asm/imc-pmu.h> 39 #include <asm/bug.h> 40 41 #include "powernv.h" 42 43 /* /sys/firmware/opal */ 44 struct kobject *opal_kobj; 45 46 struct opal { 47 u64 base; 48 u64 entry; 49 u64 size; 50 } opal; 51 52 struct mcheck_recoverable_range { 53 u64 start_addr; 54 u64 end_addr; 55 u64 recover_addr; 56 }; 57 58 static struct mcheck_recoverable_range *mc_recoverable_range; 59 static int mc_recoverable_range_len; 60 61 struct device_node *opal_node; 62 static DEFINE_SPINLOCK(opal_write_lock); 63 static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 64 static uint32_t opal_heartbeat; 65 static struct task_struct *kopald_tsk; 66 67 void opal_configure_cores(void) 68 { 69 u64 reinit_flags = 0; 70 71 /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 72 * 73 * It will preserve non volatile GPRs and HSPRG0/1. It will 74 * also restore HIDs and other SPRs to their original value 75 * but it might clobber a bunch. 76 */ 77 #ifdef __BIG_ENDIAN__ 78 reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; 79 #else 80 reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; 81 #endif 82 83 /* 84 * POWER9 always support running hash: 85 * ie. Host hash supports hash guests 86 * Host radix supports hash/radix guests 87 */ 88 if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { 89 reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; 90 if (early_radix_enabled()) 91 reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; 92 } 93 94 opal_reinit_cpus(reinit_flags); 95 96 /* Restore some bits */ 97 if (cur_cpu_spec->cpu_restore) 98 cur_cpu_spec->cpu_restore(); 99 } 100 101 int __init early_init_dt_scan_opal(unsigned long node, 102 const char *uname, int depth, void *data) 103 { 104 const void *basep, *entryp, *sizep; 105 int basesz, entrysz, runtimesz; 106 107 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 108 return 0; 109 110 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 111 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 112 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 113 114 if (!basep || !entryp || !sizep) 115 return 1; 116 117 opal.base = of_read_number(basep, basesz/4); 118 opal.entry = of_read_number(entryp, entrysz/4); 119 opal.size = of_read_number(sizep, runtimesz/4); 120 121 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 122 opal.base, basep, basesz); 123 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 124 opal.entry, entryp, entrysz); 125 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 126 opal.size, sizep, runtimesz); 127 128 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 129 powerpc_firmware_features |= FW_FEATURE_OPAL; 130 pr_info("OPAL detected !\n"); 131 } else { 132 panic("OPAL != V3 detected, no longer supported.\n"); 133 } 134 135 return 1; 136 } 137 138 int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 139 const char *uname, int depth, void *data) 140 { 141 int i, psize, size; 142 const __be32 *prop; 143 144 if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 145 return 0; 146 147 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 148 149 if (!prop) 150 return 1; 151 152 pr_debug("Found machine check recoverable ranges.\n"); 153 154 /* 155 * Calculate number of available entries. 156 * 157 * Each recoverable address range entry is (start address, len, 158 * recovery address), 2 cells each for start and recovery address, 159 * 1 cell for len, totalling 5 cells per entry. 160 */ 161 mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 162 163 /* Sanity check */ 164 if (!mc_recoverable_range_len) 165 return 1; 166 167 /* Size required to hold all the entries. */ 168 size = mc_recoverable_range_len * 169 sizeof(struct mcheck_recoverable_range); 170 171 /* 172 * Allocate a buffer to hold the MC recoverable ranges. 173 */ 174 mc_recoverable_range =__va(memblock_alloc(size, __alignof__(u64))); 175 memset(mc_recoverable_range, 0, size); 176 177 for (i = 0; i < mc_recoverable_range_len; i++) { 178 mc_recoverable_range[i].start_addr = 179 of_read_number(prop + (i * 5) + 0, 2); 180 mc_recoverable_range[i].end_addr = 181 mc_recoverable_range[i].start_addr + 182 of_read_number(prop + (i * 5) + 2, 1); 183 mc_recoverable_range[i].recover_addr = 184 of_read_number(prop + (i * 5) + 3, 2); 185 186 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 187 mc_recoverable_range[i].start_addr, 188 mc_recoverable_range[i].end_addr, 189 mc_recoverable_range[i].recover_addr); 190 } 191 return 1; 192 } 193 194 static int __init opal_register_exception_handlers(void) 195 { 196 #ifdef __BIG_ENDIAN__ 197 u64 glue; 198 199 if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 200 return -ENODEV; 201 202 /* Hookup some exception handlers except machine check. We use the 203 * fwnmi area at 0x7000 to provide the glue space to OPAL 204 */ 205 glue = 0x7000; 206 207 /* 208 * Check if we are running on newer firmware that exports 209 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 210 * the HMI interrupt and we catch it directly in Linux. 211 * 212 * For older firmware (i.e currently released POWER8 System Firmware 213 * as of today <= SV810_087), we fallback to old behavior and let OPAL 214 * patch the HMI vector and handle it inside OPAL firmware. 215 * 216 * For newer firmware (in development/yet to be released) we will 217 * start catching/handling HMI directly in Linux. 218 */ 219 if (!opal_check_token(OPAL_HANDLE_HMI)) { 220 pr_info("Old firmware detected, OPAL handles HMIs.\n"); 221 opal_register_exception_handler( 222 OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 223 0, glue); 224 glue += 128; 225 } 226 227 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 228 #endif 229 230 return 0; 231 } 232 machine_early_initcall(powernv, opal_register_exception_handlers); 233 234 /* 235 * Opal message notifier based on message type. Allow subscribers to get 236 * notified for specific messgae type. 237 */ 238 int opal_message_notifier_register(enum opal_msg_type msg_type, 239 struct notifier_block *nb) 240 { 241 if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 242 pr_warning("%s: Invalid arguments, msg_type:%d\n", 243 __func__, msg_type); 244 return -EINVAL; 245 } 246 247 return atomic_notifier_chain_register( 248 &opal_msg_notifier_head[msg_type], nb); 249 } 250 EXPORT_SYMBOL_GPL(opal_message_notifier_register); 251 252 int opal_message_notifier_unregister(enum opal_msg_type msg_type, 253 struct notifier_block *nb) 254 { 255 return atomic_notifier_chain_unregister( 256 &opal_msg_notifier_head[msg_type], nb); 257 } 258 EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 259 260 static void opal_message_do_notify(uint32_t msg_type, void *msg) 261 { 262 /* notify subscribers */ 263 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 264 msg_type, msg); 265 } 266 267 static void opal_handle_message(void) 268 { 269 s64 ret; 270 /* 271 * TODO: pre-allocate a message buffer depending on opal-msg-size 272 * value in /proc/device-tree. 273 */ 274 static struct opal_msg msg; 275 u32 type; 276 277 ret = opal_get_msg(__pa(&msg), sizeof(msg)); 278 /* No opal message pending. */ 279 if (ret == OPAL_RESOURCE) 280 return; 281 282 /* check for errors. */ 283 if (ret) { 284 pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 285 __func__, ret); 286 return; 287 } 288 289 type = be32_to_cpu(msg.msg_type); 290 291 /* Sanity check */ 292 if (type >= OPAL_MSG_TYPE_MAX) { 293 pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 294 return; 295 } 296 opal_message_do_notify(type, (void *)&msg); 297 } 298 299 static irqreturn_t opal_message_notify(int irq, void *data) 300 { 301 opal_handle_message(); 302 return IRQ_HANDLED; 303 } 304 305 static int __init opal_message_init(void) 306 { 307 int ret, i, irq; 308 309 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 310 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 311 312 irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 313 if (!irq) { 314 pr_err("%s: Can't register OPAL event irq (%d)\n", 315 __func__, irq); 316 return irq; 317 } 318 319 ret = request_irq(irq, opal_message_notify, 320 IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 321 if (ret) { 322 pr_err("%s: Can't request OPAL event irq (%d)\n", 323 __func__, ret); 324 return ret; 325 } 326 327 return 0; 328 } 329 330 int opal_get_chars(uint32_t vtermno, char *buf, int count) 331 { 332 s64 rc; 333 __be64 evt, len; 334 335 if (!opal.entry) 336 return -ENODEV; 337 opal_poll_events(&evt); 338 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 339 return 0; 340 len = cpu_to_be64(count); 341 rc = opal_console_read(vtermno, &len, buf); 342 if (rc == OPAL_SUCCESS) 343 return be64_to_cpu(len); 344 return 0; 345 } 346 347 int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 348 { 349 int written = 0; 350 __be64 olen; 351 s64 len, rc; 352 unsigned long flags; 353 __be64 evt; 354 355 if (!opal.entry) 356 return -ENODEV; 357 358 /* We want put_chars to be atomic to avoid mangling of hvsi 359 * packets. To do that, we first test for room and return 360 * -EAGAIN if there isn't enough. 361 * 362 * Unfortunately, opal_console_write_buffer_space() doesn't 363 * appear to work on opal v1, so we just assume there is 364 * enough room and be done with it 365 */ 366 spin_lock_irqsave(&opal_write_lock, flags); 367 rc = opal_console_write_buffer_space(vtermno, &olen); 368 len = be64_to_cpu(olen); 369 if (rc || len < total_len) { 370 spin_unlock_irqrestore(&opal_write_lock, flags); 371 /* Closed -> drop characters */ 372 if (rc) 373 return total_len; 374 opal_poll_events(NULL); 375 return -EAGAIN; 376 } 377 378 /* We still try to handle partial completions, though they 379 * should no longer happen. 380 */ 381 rc = OPAL_BUSY; 382 while(total_len > 0 && (rc == OPAL_BUSY || 383 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 384 olen = cpu_to_be64(total_len); 385 rc = opal_console_write(vtermno, &olen, data); 386 len = be64_to_cpu(olen); 387 388 /* Closed or other error drop */ 389 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 390 rc != OPAL_BUSY_EVENT) { 391 written = total_len; 392 break; 393 } 394 if (rc == OPAL_SUCCESS) { 395 total_len -= len; 396 data += len; 397 written += len; 398 } 399 /* This is a bit nasty but we need that for the console to 400 * flush when there aren't any interrupts. We will clean 401 * things a bit later to limit that to synchronous path 402 * such as the kernel console and xmon/udbg 403 */ 404 do 405 opal_poll_events(&evt); 406 while(rc == OPAL_SUCCESS && 407 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 408 } 409 spin_unlock_irqrestore(&opal_write_lock, flags); 410 return written; 411 } 412 413 static int opal_recover_mce(struct pt_regs *regs, 414 struct machine_check_event *evt) 415 { 416 int recovered = 0; 417 418 if (!(regs->msr & MSR_RI)) { 419 /* If MSR_RI isn't set, we cannot recover */ 420 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 421 recovered = 0; 422 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 423 /* Platform corrected itself */ 424 recovered = 1; 425 } else if (evt->severity == MCE_SEV_FATAL) { 426 /* Fatal machine check */ 427 pr_err("Machine check interrupt is fatal\n"); 428 recovered = 0; 429 } 430 431 if (!recovered && evt->severity == MCE_SEV_ERROR_SYNC) { 432 /* 433 * Try to kill processes if we get a synchronous machine check 434 * (e.g., one caused by execution of this instruction). This 435 * will devolve into a panic if we try to kill init or are in 436 * an interrupt etc. 437 * 438 * TODO: Queue up this address for hwpoisioning later. 439 * TODO: This is not quite right for d-side machine 440 * checks ->nip is not necessarily the important 441 * address. 442 */ 443 if ((user_mode(regs))) { 444 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 445 recovered = 1; 446 } else if (die_will_crash()) { 447 /* 448 * die() would kill the kernel, so better to go via 449 * the platform reboot code that will log the 450 * machine check. 451 */ 452 recovered = 0; 453 } else { 454 die("Machine check", regs, SIGBUS); 455 recovered = 1; 456 } 457 } 458 459 return recovered; 460 } 461 462 void pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) 463 { 464 /* 465 * This is mostly taken from kernel/panic.c, but tries to do 466 * relatively minimal work. Don't use delay functions (TB may 467 * be broken), don't crash dump (need to set a firmware log), 468 * don't run notifiers. We do want to get some information to 469 * Linux console. 470 */ 471 console_verbose(); 472 bust_spinlocks(1); 473 pr_emerg("Hardware platform error: %s\n", msg); 474 if (regs) 475 show_regs(regs); 476 smp_send_stop(); 477 printk_safe_flush_on_panic(); 478 kmsg_dump(KMSG_DUMP_PANIC); 479 bust_spinlocks(0); 480 debug_locks_off(); 481 console_flush_on_panic(); 482 483 /* 484 * Don't bother to shut things down because this will 485 * xstop the system. 486 */ 487 if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) 488 == OPAL_UNSUPPORTED) { 489 pr_emerg("Reboot type %d not supported for %s\n", 490 OPAL_REBOOT_PLATFORM_ERROR, msg); 491 } 492 493 /* 494 * We reached here. There can be three possibilities: 495 * 1. We are running on a firmware level that do not support 496 * opal_cec_reboot2() 497 * 2. We are running on a firmware level that do not support 498 * OPAL_REBOOT_PLATFORM_ERROR reboot type. 499 * 3. We are running on FSP based system that does not need 500 * opal to trigger checkstop explicitly for error analysis. 501 * The FSP PRD component would have already got notified 502 * about this error through other channels. 503 */ 504 505 ppc_md.restart(NULL); 506 } 507 508 int opal_machine_check(struct pt_regs *regs) 509 { 510 struct machine_check_event evt; 511 512 if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 513 return 0; 514 515 /* Print things out */ 516 if (evt.version != MCE_V1) { 517 pr_err("Machine Check Exception, Unknown event version %d !\n", 518 evt.version); 519 return 0; 520 } 521 machine_check_print_event_info(&evt, user_mode(regs)); 522 523 if (opal_recover_mce(regs, &evt)) 524 return 1; 525 526 pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); 527 } 528 529 /* Early hmi handler called in real mode. */ 530 int opal_hmi_exception_early(struct pt_regs *regs) 531 { 532 s64 rc; 533 534 /* 535 * call opal hmi handler. Pass paca address as token. 536 * The return value OPAL_SUCCESS is an indication that there is 537 * an HMI event generated waiting to pull by Linux. 538 */ 539 rc = opal_handle_hmi(); 540 if (rc == OPAL_SUCCESS) { 541 local_paca->hmi_event_available = 1; 542 return 1; 543 } 544 return 0; 545 } 546 547 /* HMI exception handler called in virtual mode during check_irq_replay. */ 548 int opal_handle_hmi_exception(struct pt_regs *regs) 549 { 550 s64 rc; 551 __be64 evt = 0; 552 553 /* 554 * Check if HMI event is available. 555 * if Yes, then call opal_poll_events to pull opal messages and 556 * process them. 557 */ 558 if (!local_paca->hmi_event_available) 559 return 0; 560 561 local_paca->hmi_event_available = 0; 562 rc = opal_poll_events(&evt); 563 if (rc == OPAL_SUCCESS && evt) 564 opal_handle_events(be64_to_cpu(evt)); 565 566 return 1; 567 } 568 569 static uint64_t find_recovery_address(uint64_t nip) 570 { 571 int i; 572 573 for (i = 0; i < mc_recoverable_range_len; i++) 574 if ((nip >= mc_recoverable_range[i].start_addr) && 575 (nip < mc_recoverable_range[i].end_addr)) 576 return mc_recoverable_range[i].recover_addr; 577 return 0; 578 } 579 580 bool opal_mce_check_early_recovery(struct pt_regs *regs) 581 { 582 uint64_t recover_addr = 0; 583 584 if (!opal.base || !opal.size) 585 goto out; 586 587 if ((regs->nip >= opal.base) && 588 (regs->nip < (opal.base + opal.size))) 589 recover_addr = find_recovery_address(regs->nip); 590 591 /* 592 * Setup regs->nip to rfi into fixup address. 593 */ 594 if (recover_addr) 595 regs->nip = recover_addr; 596 597 out: 598 return !!recover_addr; 599 } 600 601 static int opal_sysfs_init(void) 602 { 603 opal_kobj = kobject_create_and_add("opal", firmware_kobj); 604 if (!opal_kobj) { 605 pr_warn("kobject_create_and_add opal failed\n"); 606 return -ENOMEM; 607 } 608 609 return 0; 610 } 611 612 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 613 struct bin_attribute *bin_attr, 614 char *buf, loff_t off, size_t count) 615 { 616 return memory_read_from_buffer(buf, count, &off, bin_attr->private, 617 bin_attr->size); 618 } 619 620 static BIN_ATTR_RO(symbol_map, 0); 621 622 static void opal_export_symmap(void) 623 { 624 const __be64 *syms; 625 unsigned int size; 626 struct device_node *fw; 627 int rc; 628 629 fw = of_find_node_by_path("/ibm,opal/firmware"); 630 if (!fw) 631 return; 632 syms = of_get_property(fw, "symbol-map", &size); 633 if (!syms || size != 2 * sizeof(__be64)) 634 return; 635 636 /* Setup attributes */ 637 bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 638 bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 639 640 rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 641 if (rc) 642 pr_warn("Error %d creating OPAL symbols file\n", rc); 643 } 644 645 static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 646 struct bin_attribute *bin_attr, char *buf, 647 loff_t off, size_t count) 648 { 649 return memory_read_from_buffer(buf, count, &off, bin_attr->private, 650 bin_attr->size); 651 } 652 653 /* 654 * opal_export_attrs: creates a sysfs node for each property listed in 655 * the device-tree under /ibm,opal/firmware/exports/ 656 * All new sysfs nodes are created under /opal/exports/. 657 * This allows for reserved memory regions (e.g. HDAT) to be read. 658 * The new sysfs nodes are only readable by root. 659 */ 660 static void opal_export_attrs(void) 661 { 662 struct bin_attribute *attr; 663 struct device_node *np; 664 struct property *prop; 665 struct kobject *kobj; 666 u64 vals[2]; 667 int rc; 668 669 np = of_find_node_by_path("/ibm,opal/firmware/exports"); 670 if (!np) 671 return; 672 673 /* Create new 'exports' directory - /sys/firmware/opal/exports */ 674 kobj = kobject_create_and_add("exports", opal_kobj); 675 if (!kobj) { 676 pr_warn("kobject_create_and_add() of exports failed\n"); 677 return; 678 } 679 680 for_each_property_of_node(np, prop) { 681 if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 682 continue; 683 684 if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 685 continue; 686 687 attr = kzalloc(sizeof(*attr), GFP_KERNEL); 688 689 if (attr == NULL) { 690 pr_warn("Failed kmalloc for bin_attribute!"); 691 continue; 692 } 693 694 sysfs_bin_attr_init(attr); 695 attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 696 attr->attr.mode = 0400; 697 attr->read = export_attr_read; 698 attr->private = __va(vals[0]); 699 attr->size = vals[1]; 700 701 if (attr->attr.name == NULL) { 702 pr_warn("Failed kstrdup for bin_attribute attr.name"); 703 kfree(attr); 704 continue; 705 } 706 707 rc = sysfs_create_bin_file(kobj, attr); 708 if (rc) { 709 pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 710 rc, prop->name); 711 kfree(attr->attr.name); 712 kfree(attr); 713 } 714 } 715 716 of_node_put(np); 717 } 718 719 static void __init opal_dump_region_init(void) 720 { 721 void *addr; 722 uint64_t size; 723 int rc; 724 725 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 726 return; 727 728 /* Register kernel log buffer */ 729 addr = log_buf_addr_get(); 730 if (addr == NULL) 731 return; 732 733 size = log_buf_len_get(); 734 if (size == 0) 735 return; 736 737 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 738 __pa(addr), size); 739 /* Don't warn if this is just an older OPAL that doesn't 740 * know about that call 741 */ 742 if (rc && rc != OPAL_UNSUPPORTED) 743 pr_warn("DUMP: Failed to register kernel log buffer. " 744 "rc = %d\n", rc); 745 } 746 747 static void opal_pdev_init(const char *compatible) 748 { 749 struct device_node *np; 750 751 for_each_compatible_node(np, NULL, compatible) 752 of_platform_device_create(np, NULL, NULL); 753 } 754 755 static void __init opal_imc_init_dev(void) 756 { 757 struct device_node *np; 758 759 np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 760 if (np) 761 of_platform_device_create(np, NULL, NULL); 762 } 763 764 static int kopald(void *unused) 765 { 766 unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 767 __be64 events; 768 769 set_freezable(); 770 do { 771 try_to_freeze(); 772 opal_poll_events(&events); 773 opal_handle_events(be64_to_cpu(events)); 774 schedule_timeout_interruptible(timeout); 775 } while (!kthread_should_stop()); 776 777 return 0; 778 } 779 780 void opal_wake_poller(void) 781 { 782 if (kopald_tsk) 783 wake_up_process(kopald_tsk); 784 } 785 786 static void opal_init_heartbeat(void) 787 { 788 /* Old firwmware, we assume the HVC heartbeat is sufficient */ 789 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 790 &opal_heartbeat) != 0) 791 opal_heartbeat = 0; 792 793 if (opal_heartbeat) 794 kopald_tsk = kthread_run(kopald, NULL, "kopald"); 795 } 796 797 static int __init opal_init(void) 798 { 799 struct device_node *np, *consoles, *leds; 800 int rc; 801 802 opal_node = of_find_node_by_path("/ibm,opal"); 803 if (!opal_node) { 804 pr_warn("Device node not found\n"); 805 return -ENODEV; 806 } 807 808 /* Register OPAL consoles if any ports */ 809 consoles = of_find_node_by_path("/ibm,opal/consoles"); 810 if (consoles) { 811 for_each_child_of_node(consoles, np) { 812 if (strcmp(np->name, "serial")) 813 continue; 814 of_platform_device_create(np, NULL, NULL); 815 } 816 of_node_put(consoles); 817 } 818 819 /* Initialise OPAL messaging system */ 820 opal_message_init(); 821 822 /* Initialise OPAL asynchronous completion interface */ 823 opal_async_comp_init(); 824 825 /* Initialise OPAL sensor interface */ 826 opal_sensor_init(); 827 828 /* Initialise OPAL hypervisor maintainence interrupt handling */ 829 opal_hmi_handler_init(); 830 831 /* Create i2c platform devices */ 832 opal_pdev_init("ibm,opal-i2c"); 833 834 /* Setup a heatbeat thread if requested by OPAL */ 835 opal_init_heartbeat(); 836 837 /* Detect In-Memory Collection counters and create devices*/ 838 opal_imc_init_dev(); 839 840 /* Create leds platform devices */ 841 leds = of_find_node_by_path("/ibm,opal/leds"); 842 if (leds) { 843 of_platform_device_create(leds, "opal_leds", NULL); 844 of_node_put(leds); 845 } 846 847 /* Initialise OPAL message log interface */ 848 opal_msglog_init(); 849 850 /* Create "opal" kobject under /sys/firmware */ 851 rc = opal_sysfs_init(); 852 if (rc == 0) { 853 /* Export symbol map to userspace */ 854 opal_export_symmap(); 855 /* Setup dump region interface */ 856 opal_dump_region_init(); 857 /* Setup error log interface */ 858 rc = opal_elog_init(); 859 /* Setup code update interface */ 860 opal_flash_update_init(); 861 /* Setup platform dump extract interface */ 862 opal_platform_dump_init(); 863 /* Setup system parameters interface */ 864 opal_sys_param_init(); 865 /* Setup message log sysfs interface. */ 866 opal_msglog_sysfs_init(); 867 } 868 869 /* Export all properties */ 870 opal_export_attrs(); 871 872 /* Initialize platform devices: IPMI backend, PRD & flash interface */ 873 opal_pdev_init("ibm,opal-ipmi"); 874 opal_pdev_init("ibm,opal-flash"); 875 opal_pdev_init("ibm,opal-prd"); 876 877 /* Initialise platform device: oppanel interface */ 878 opal_pdev_init("ibm,opal-oppanel"); 879 880 /* Initialise OPAL kmsg dumper for flushing console on panic */ 881 opal_kmsg_init(); 882 883 /* Initialise OPAL powercap interface */ 884 opal_powercap_init(); 885 886 /* Initialise OPAL Power-Shifting-Ratio interface */ 887 opal_psr_init(); 888 889 /* Initialise OPAL sensor groups */ 890 opal_sensor_groups_init(); 891 892 return 0; 893 } 894 machine_subsys_initcall(powernv, opal_init); 895 896 void opal_shutdown(void) 897 { 898 long rc = OPAL_BUSY; 899 900 opal_event_shutdown(); 901 902 /* 903 * Then sync with OPAL which ensure anything that can 904 * potentially write to our memory has completed such 905 * as an ongoing dump retrieval 906 */ 907 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 908 rc = opal_sync_host_reboot(); 909 if (rc == OPAL_BUSY) 910 opal_poll_events(NULL); 911 else 912 mdelay(10); 913 } 914 915 /* Unregister memory dump region */ 916 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 917 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 918 } 919 920 /* Export this so that test modules can use it */ 921 EXPORT_SYMBOL_GPL(opal_invalid_call); 922 EXPORT_SYMBOL_GPL(opal_xscom_read); 923 EXPORT_SYMBOL_GPL(opal_xscom_write); 924 EXPORT_SYMBOL_GPL(opal_ipmi_send); 925 EXPORT_SYMBOL_GPL(opal_ipmi_recv); 926 EXPORT_SYMBOL_GPL(opal_flash_read); 927 EXPORT_SYMBOL_GPL(opal_flash_write); 928 EXPORT_SYMBOL_GPL(opal_flash_erase); 929 EXPORT_SYMBOL_GPL(opal_prd_msg); 930 931 /* Convert a region of vmalloc memory to an opal sg list */ 932 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 933 unsigned long vmalloc_size) 934 { 935 struct opal_sg_list *sg, *first = NULL; 936 unsigned long i = 0; 937 938 sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 939 if (!sg) 940 goto nomem; 941 942 first = sg; 943 944 while (vmalloc_size > 0) { 945 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 946 uint64_t length = min(vmalloc_size, PAGE_SIZE); 947 948 sg->entry[i].data = cpu_to_be64(data); 949 sg->entry[i].length = cpu_to_be64(length); 950 i++; 951 952 if (i >= SG_ENTRIES_PER_NODE) { 953 struct opal_sg_list *next; 954 955 next = kzalloc(PAGE_SIZE, GFP_KERNEL); 956 if (!next) 957 goto nomem; 958 959 sg->length = cpu_to_be64( 960 i * sizeof(struct opal_sg_entry) + 16); 961 i = 0; 962 sg->next = cpu_to_be64(__pa(next)); 963 sg = next; 964 } 965 966 vmalloc_addr += length; 967 vmalloc_size -= length; 968 } 969 970 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 971 972 return first; 973 974 nomem: 975 pr_err("%s : Failed to allocate memory\n", __func__); 976 opal_free_sg_list(first); 977 return NULL; 978 } 979 980 void opal_free_sg_list(struct opal_sg_list *sg) 981 { 982 while (sg) { 983 uint64_t next = be64_to_cpu(sg->next); 984 985 kfree(sg); 986 987 if (next) 988 sg = __va(next); 989 else 990 sg = NULL; 991 } 992 } 993 994 int opal_error_code(int rc) 995 { 996 switch (rc) { 997 case OPAL_SUCCESS: return 0; 998 999 case OPAL_PARAMETER: return -EINVAL; 1000 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 1001 case OPAL_BUSY: 1002 case OPAL_BUSY_EVENT: return -EBUSY; 1003 case OPAL_NO_MEM: return -ENOMEM; 1004 case OPAL_PERMISSION: return -EPERM; 1005 1006 case OPAL_UNSUPPORTED: return -EIO; 1007 case OPAL_HARDWARE: return -EIO; 1008 case OPAL_INTERNAL_ERROR: return -EIO; 1009 case OPAL_TIMEOUT: return -ETIMEDOUT; 1010 default: 1011 pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 1012 return -EIO; 1013 } 1014 } 1015 1016 void powernv_set_nmmu_ptcr(unsigned long ptcr) 1017 { 1018 int rc; 1019 1020 if (firmware_has_feature(FW_FEATURE_OPAL)) { 1021 rc = opal_nmmu_set_ptcr(-1UL, ptcr); 1022 if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 1023 pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 1024 } 1025 } 1026 1027 EXPORT_SYMBOL_GPL(opal_poll_events); 1028 EXPORT_SYMBOL_GPL(opal_rtc_read); 1029 EXPORT_SYMBOL_GPL(opal_rtc_write); 1030 EXPORT_SYMBOL_GPL(opal_tpo_read); 1031 EXPORT_SYMBOL_GPL(opal_tpo_write); 1032 EXPORT_SYMBOL_GPL(opal_i2c_request); 1033 /* Export these symbols for PowerNV LED class driver */ 1034 EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1035 EXPORT_SYMBOL_GPL(opal_leds_set_ind); 1036 /* Export this symbol for PowerNV Operator Panel class driver */ 1037 EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1038 /* Export this for KVM */ 1039 EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 1040 EXPORT_SYMBOL_GPL(opal_int_eoi); 1041 EXPORT_SYMBOL_GPL(opal_error_code); 1042