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_debug("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_warn("%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_warn("%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 panic_flush_kmsg_start(); 465 466 pr_emerg("Hardware platform error: %s\n", msg); 467 if (regs) 468 show_regs(regs); 469 smp_send_stop(); 470 471 panic_flush_kmsg_end(); 472 473 /* 474 * Don't bother to shut things down because this will 475 * xstop the system. 476 */ 477 if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) 478 == OPAL_UNSUPPORTED) { 479 pr_emerg("Reboot type %d not supported for %s\n", 480 OPAL_REBOOT_PLATFORM_ERROR, msg); 481 } 482 483 /* 484 * We reached here. There can be three possibilities: 485 * 1. We are running on a firmware level that do not support 486 * opal_cec_reboot2() 487 * 2. We are running on a firmware level that do not support 488 * OPAL_REBOOT_PLATFORM_ERROR reboot type. 489 * 3. We are running on FSP based system that does not need 490 * opal to trigger checkstop explicitly for error analysis. 491 * The FSP PRD component would have already got notified 492 * about this error through other channels. 493 * 4. We are running on a newer skiboot that by default does 494 * not cause a checkstop, drops us back to the kernel to 495 * extract context and state at the time of the error. 496 */ 497 498 panic(msg); 499 } 500 501 int opal_machine_check(struct pt_regs *regs) 502 { 503 struct machine_check_event evt; 504 505 if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 506 return 0; 507 508 /* Print things out */ 509 if (evt.version != MCE_V1) { 510 pr_err("Machine Check Exception, Unknown event version %d !\n", 511 evt.version); 512 return 0; 513 } 514 machine_check_print_event_info(&evt, user_mode(regs)); 515 516 if (opal_recover_mce(regs, &evt)) 517 return 1; 518 519 pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); 520 } 521 522 /* Early hmi handler called in real mode. */ 523 int opal_hmi_exception_early(struct pt_regs *regs) 524 { 525 s64 rc; 526 527 /* 528 * call opal hmi handler. Pass paca address as token. 529 * The return value OPAL_SUCCESS is an indication that there is 530 * an HMI event generated waiting to pull by Linux. 531 */ 532 rc = opal_handle_hmi(); 533 if (rc == OPAL_SUCCESS) { 534 local_paca->hmi_event_available = 1; 535 return 1; 536 } 537 return 0; 538 } 539 540 /* HMI exception handler called in virtual mode during check_irq_replay. */ 541 int opal_handle_hmi_exception(struct pt_regs *regs) 542 { 543 s64 rc; 544 __be64 evt = 0; 545 546 /* 547 * Check if HMI event is available. 548 * if Yes, then call opal_poll_events to pull opal messages and 549 * process them. 550 */ 551 if (!local_paca->hmi_event_available) 552 return 0; 553 554 local_paca->hmi_event_available = 0; 555 rc = opal_poll_events(&evt); 556 if (rc == OPAL_SUCCESS && evt) 557 opal_handle_events(be64_to_cpu(evt)); 558 559 return 1; 560 } 561 562 static uint64_t find_recovery_address(uint64_t nip) 563 { 564 int i; 565 566 for (i = 0; i < mc_recoverable_range_len; i++) 567 if ((nip >= mc_recoverable_range[i].start_addr) && 568 (nip < mc_recoverable_range[i].end_addr)) 569 return mc_recoverable_range[i].recover_addr; 570 return 0; 571 } 572 573 bool opal_mce_check_early_recovery(struct pt_regs *regs) 574 { 575 uint64_t recover_addr = 0; 576 577 if (!opal.base || !opal.size) 578 goto out; 579 580 if ((regs->nip >= opal.base) && 581 (regs->nip < (opal.base + opal.size))) 582 recover_addr = find_recovery_address(regs->nip); 583 584 /* 585 * Setup regs->nip to rfi into fixup address. 586 */ 587 if (recover_addr) 588 regs->nip = recover_addr; 589 590 out: 591 return !!recover_addr; 592 } 593 594 static int opal_sysfs_init(void) 595 { 596 opal_kobj = kobject_create_and_add("opal", firmware_kobj); 597 if (!opal_kobj) { 598 pr_warn("kobject_create_and_add opal failed\n"); 599 return -ENOMEM; 600 } 601 602 return 0; 603 } 604 605 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 606 struct bin_attribute *bin_attr, 607 char *buf, loff_t off, size_t count) 608 { 609 return memory_read_from_buffer(buf, count, &off, bin_attr->private, 610 bin_attr->size); 611 } 612 613 static BIN_ATTR_RO(symbol_map, 0); 614 615 static void opal_export_symmap(void) 616 { 617 const __be64 *syms; 618 unsigned int size; 619 struct device_node *fw; 620 int rc; 621 622 fw = of_find_node_by_path("/ibm,opal/firmware"); 623 if (!fw) 624 return; 625 syms = of_get_property(fw, "symbol-map", &size); 626 if (!syms || size != 2 * sizeof(__be64)) 627 return; 628 629 /* Setup attributes */ 630 bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 631 bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 632 633 rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 634 if (rc) 635 pr_warn("Error %d creating OPAL symbols file\n", rc); 636 } 637 638 static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 639 struct bin_attribute *bin_attr, char *buf, 640 loff_t off, size_t count) 641 { 642 return memory_read_from_buffer(buf, count, &off, bin_attr->private, 643 bin_attr->size); 644 } 645 646 /* 647 * opal_export_attrs: creates a sysfs node for each property listed in 648 * the device-tree under /ibm,opal/firmware/exports/ 649 * All new sysfs nodes are created under /opal/exports/. 650 * This allows for reserved memory regions (e.g. HDAT) to be read. 651 * The new sysfs nodes are only readable by root. 652 */ 653 static void opal_export_attrs(void) 654 { 655 struct bin_attribute *attr; 656 struct device_node *np; 657 struct property *prop; 658 struct kobject *kobj; 659 u64 vals[2]; 660 int rc; 661 662 np = of_find_node_by_path("/ibm,opal/firmware/exports"); 663 if (!np) 664 return; 665 666 /* Create new 'exports' directory - /sys/firmware/opal/exports */ 667 kobj = kobject_create_and_add("exports", opal_kobj); 668 if (!kobj) { 669 pr_warn("kobject_create_and_add() of exports failed\n"); 670 return; 671 } 672 673 for_each_property_of_node(np, prop) { 674 if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 675 continue; 676 677 if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 678 continue; 679 680 attr = kzalloc(sizeof(*attr), GFP_KERNEL); 681 682 if (attr == NULL) { 683 pr_warn("Failed kmalloc for bin_attribute!"); 684 continue; 685 } 686 687 sysfs_bin_attr_init(attr); 688 attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 689 attr->attr.mode = 0400; 690 attr->read = export_attr_read; 691 attr->private = __va(vals[0]); 692 attr->size = vals[1]; 693 694 if (attr->attr.name == NULL) { 695 pr_warn("Failed kstrdup for bin_attribute attr.name"); 696 kfree(attr); 697 continue; 698 } 699 700 rc = sysfs_create_bin_file(kobj, attr); 701 if (rc) { 702 pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 703 rc, prop->name); 704 kfree(attr->attr.name); 705 kfree(attr); 706 } 707 } 708 709 of_node_put(np); 710 } 711 712 static void __init opal_dump_region_init(void) 713 { 714 void *addr; 715 uint64_t size; 716 int rc; 717 718 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 719 return; 720 721 /* Register kernel log buffer */ 722 addr = log_buf_addr_get(); 723 if (addr == NULL) 724 return; 725 726 size = log_buf_len_get(); 727 if (size == 0) 728 return; 729 730 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 731 __pa(addr), size); 732 /* Don't warn if this is just an older OPAL that doesn't 733 * know about that call 734 */ 735 if (rc && rc != OPAL_UNSUPPORTED) 736 pr_warn("DUMP: Failed to register kernel log buffer. " 737 "rc = %d\n", rc); 738 } 739 740 static void opal_pdev_init(const char *compatible) 741 { 742 struct device_node *np; 743 744 for_each_compatible_node(np, NULL, compatible) 745 of_platform_device_create(np, NULL, NULL); 746 } 747 748 static void __init opal_imc_init_dev(void) 749 { 750 struct device_node *np; 751 752 np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 753 if (np) 754 of_platform_device_create(np, NULL, NULL); 755 } 756 757 static int kopald(void *unused) 758 { 759 unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 760 __be64 events; 761 762 set_freezable(); 763 do { 764 try_to_freeze(); 765 opal_poll_events(&events); 766 opal_handle_events(be64_to_cpu(events)); 767 schedule_timeout_interruptible(timeout); 768 } while (!kthread_should_stop()); 769 770 return 0; 771 } 772 773 void opal_wake_poller(void) 774 { 775 if (kopald_tsk) 776 wake_up_process(kopald_tsk); 777 } 778 779 static void opal_init_heartbeat(void) 780 { 781 /* Old firwmware, we assume the HVC heartbeat is sufficient */ 782 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 783 &opal_heartbeat) != 0) 784 opal_heartbeat = 0; 785 786 if (opal_heartbeat) 787 kopald_tsk = kthread_run(kopald, NULL, "kopald"); 788 } 789 790 static int __init opal_init(void) 791 { 792 struct device_node *np, *consoles, *leds; 793 int rc; 794 795 opal_node = of_find_node_by_path("/ibm,opal"); 796 if (!opal_node) { 797 pr_warn("Device node not found\n"); 798 return -ENODEV; 799 } 800 801 /* Register OPAL consoles if any ports */ 802 consoles = of_find_node_by_path("/ibm,opal/consoles"); 803 if (consoles) { 804 for_each_child_of_node(consoles, np) { 805 if (strcmp(np->name, "serial")) 806 continue; 807 of_platform_device_create(np, NULL, NULL); 808 } 809 of_node_put(consoles); 810 } 811 812 /* Initialise OPAL messaging system */ 813 opal_message_init(); 814 815 /* Initialise OPAL asynchronous completion interface */ 816 opal_async_comp_init(); 817 818 /* Initialise OPAL sensor interface */ 819 opal_sensor_init(); 820 821 /* Initialise OPAL hypervisor maintainence interrupt handling */ 822 opal_hmi_handler_init(); 823 824 /* Create i2c platform devices */ 825 opal_pdev_init("ibm,opal-i2c"); 826 827 /* Handle non-volatile memory devices */ 828 opal_pdev_init("pmem-region"); 829 830 /* Setup a heatbeat thread if requested by OPAL */ 831 opal_init_heartbeat(); 832 833 /* Detect In-Memory Collection counters and create devices*/ 834 opal_imc_init_dev(); 835 836 /* Create leds platform devices */ 837 leds = of_find_node_by_path("/ibm,opal/leds"); 838 if (leds) { 839 of_platform_device_create(leds, "opal_leds", NULL); 840 of_node_put(leds); 841 } 842 843 /* Initialise OPAL message log interface */ 844 opal_msglog_init(); 845 846 /* Create "opal" kobject under /sys/firmware */ 847 rc = opal_sysfs_init(); 848 if (rc == 0) { 849 /* Export symbol map to userspace */ 850 opal_export_symmap(); 851 /* Setup dump region interface */ 852 opal_dump_region_init(); 853 /* Setup error log interface */ 854 rc = opal_elog_init(); 855 /* Setup code update interface */ 856 opal_flash_update_init(); 857 /* Setup platform dump extract interface */ 858 opal_platform_dump_init(); 859 /* Setup system parameters interface */ 860 opal_sys_param_init(); 861 /* Setup message log sysfs interface. */ 862 opal_msglog_sysfs_init(); 863 } 864 865 /* Export all properties */ 866 opal_export_attrs(); 867 868 /* Initialize platform devices: IPMI backend, PRD & flash interface */ 869 opal_pdev_init("ibm,opal-ipmi"); 870 opal_pdev_init("ibm,opal-flash"); 871 opal_pdev_init("ibm,opal-prd"); 872 873 /* Initialise platform device: oppanel interface */ 874 opal_pdev_init("ibm,opal-oppanel"); 875 876 /* Initialise OPAL kmsg dumper for flushing console on panic */ 877 opal_kmsg_init(); 878 879 /* Initialise OPAL powercap interface */ 880 opal_powercap_init(); 881 882 /* Initialise OPAL Power-Shifting-Ratio interface */ 883 opal_psr_init(); 884 885 /* Initialise OPAL sensor groups */ 886 opal_sensor_groups_init(); 887 888 return 0; 889 } 890 machine_subsys_initcall(powernv, opal_init); 891 892 void opal_shutdown(void) 893 { 894 long rc = OPAL_BUSY; 895 896 opal_event_shutdown(); 897 898 /* 899 * Then sync with OPAL which ensure anything that can 900 * potentially write to our memory has completed such 901 * as an ongoing dump retrieval 902 */ 903 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 904 rc = opal_sync_host_reboot(); 905 if (rc == OPAL_BUSY) 906 opal_poll_events(NULL); 907 else 908 mdelay(10); 909 } 910 911 /* Unregister memory dump region */ 912 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 913 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 914 } 915 916 /* Export this so that test modules can use it */ 917 EXPORT_SYMBOL_GPL(opal_invalid_call); 918 EXPORT_SYMBOL_GPL(opal_xscom_read); 919 EXPORT_SYMBOL_GPL(opal_xscom_write); 920 EXPORT_SYMBOL_GPL(opal_ipmi_send); 921 EXPORT_SYMBOL_GPL(opal_ipmi_recv); 922 EXPORT_SYMBOL_GPL(opal_flash_read); 923 EXPORT_SYMBOL_GPL(opal_flash_write); 924 EXPORT_SYMBOL_GPL(opal_flash_erase); 925 EXPORT_SYMBOL_GPL(opal_prd_msg); 926 927 /* Convert a region of vmalloc memory to an opal sg list */ 928 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 929 unsigned long vmalloc_size) 930 { 931 struct opal_sg_list *sg, *first = NULL; 932 unsigned long i = 0; 933 934 sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 935 if (!sg) 936 goto nomem; 937 938 first = sg; 939 940 while (vmalloc_size > 0) { 941 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 942 uint64_t length = min(vmalloc_size, PAGE_SIZE); 943 944 sg->entry[i].data = cpu_to_be64(data); 945 sg->entry[i].length = cpu_to_be64(length); 946 i++; 947 948 if (i >= SG_ENTRIES_PER_NODE) { 949 struct opal_sg_list *next; 950 951 next = kzalloc(PAGE_SIZE, GFP_KERNEL); 952 if (!next) 953 goto nomem; 954 955 sg->length = cpu_to_be64( 956 i * sizeof(struct opal_sg_entry) + 16); 957 i = 0; 958 sg->next = cpu_to_be64(__pa(next)); 959 sg = next; 960 } 961 962 vmalloc_addr += length; 963 vmalloc_size -= length; 964 } 965 966 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 967 968 return first; 969 970 nomem: 971 pr_err("%s : Failed to allocate memory\n", __func__); 972 opal_free_sg_list(first); 973 return NULL; 974 } 975 976 void opal_free_sg_list(struct opal_sg_list *sg) 977 { 978 while (sg) { 979 uint64_t next = be64_to_cpu(sg->next); 980 981 kfree(sg); 982 983 if (next) 984 sg = __va(next); 985 else 986 sg = NULL; 987 } 988 } 989 990 int opal_error_code(int rc) 991 { 992 switch (rc) { 993 case OPAL_SUCCESS: return 0; 994 995 case OPAL_PARAMETER: return -EINVAL; 996 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 997 case OPAL_BUSY: 998 case OPAL_BUSY_EVENT: return -EBUSY; 999 case OPAL_NO_MEM: return -ENOMEM; 1000 case OPAL_PERMISSION: return -EPERM; 1001 1002 case OPAL_UNSUPPORTED: return -EIO; 1003 case OPAL_HARDWARE: return -EIO; 1004 case OPAL_INTERNAL_ERROR: return -EIO; 1005 case OPAL_TIMEOUT: return -ETIMEDOUT; 1006 default: 1007 pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 1008 return -EIO; 1009 } 1010 } 1011 1012 void powernv_set_nmmu_ptcr(unsigned long ptcr) 1013 { 1014 int rc; 1015 1016 if (firmware_has_feature(FW_FEATURE_OPAL)) { 1017 rc = opal_nmmu_set_ptcr(-1UL, ptcr); 1018 if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 1019 pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 1020 } 1021 } 1022 1023 EXPORT_SYMBOL_GPL(opal_poll_events); 1024 EXPORT_SYMBOL_GPL(opal_rtc_read); 1025 EXPORT_SYMBOL_GPL(opal_rtc_write); 1026 EXPORT_SYMBOL_GPL(opal_tpo_read); 1027 EXPORT_SYMBOL_GPL(opal_tpo_write); 1028 EXPORT_SYMBOL_GPL(opal_i2c_request); 1029 /* Export these symbols for PowerNV LED class driver */ 1030 EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1031 EXPORT_SYMBOL_GPL(opal_leds_set_ind); 1032 /* Export this symbol for PowerNV Operator Panel class driver */ 1033 EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1034 /* Export this for KVM */ 1035 EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 1036 EXPORT_SYMBOL_GPL(opal_int_eoi); 1037 EXPORT_SYMBOL_GPL(opal_error_code); 1038