arch/powerpc/platforms/powernv/opal.c

   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);