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 #undef DEBUG
  13
  14 #include <linux/types.h>
  15 #include <linux/of.h>
  16 #include <linux/of_fdt.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/notifier.h>
  20 #include <linux/slab.h>
  21 #include <linux/sched.h>
  22 #include <linux/kobject.h>
  23 #include <linux/delay.h>
  24 #include <linux/memblock.h>
  25
  26 #include <asm/machdep.h>
  27 #include <asm/opal.h>
  28 #include <asm/firmware.h>
  29 #include <asm/mce.h>
  30
  31 #include "powernv.h"
  32
  33 /* /sys/firmware/opal */
  34 struct kobject *opal_kobj;
  35
  36 struct opal {
  37         u64 base;
  38         u64 entry;
  39         u64 size;
  40 } opal;
  41
  42 struct mcheck_recoverable_range {
  43         u64 start_addr;
  44         u64 end_addr;
  45         u64 recover_addr;
  46 };
  47
  48 static struct mcheck_recoverable_range *mc_recoverable_range;
  49 static int mc_recoverable_range_len;
  50
  51 struct device_node *opal_node;
  52 static DEFINE_SPINLOCK(opal_write_lock);
  53 static unsigned int *opal_irqs;
  54 static unsigned int opal_irq_count;
  55 static ATOMIC_NOTIFIER_HEAD(opal_notifier_head);
  56 static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
  57 static DEFINE_SPINLOCK(opal_notifier_lock);
  58 static uint64_t last_notified_mask = 0x0ul;
  59 static atomic_t opal_notifier_hold = ATOMIC_INIT(0);
  60
  61 static void opal_reinit_cores(void)
  62 {
  63         /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
  64          *
  65          * It will preserve non volatile GPRs and HSPRG0/1. It will
  66          * also restore HIDs and other SPRs to their original value
  67          * but it might clobber a bunch.
  68          */
  69 #ifdef __BIG_ENDIAN__
  70         opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
  71 #else
  72         opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE);
  73 #endif
  74 }
  75
  76 int __init early_init_dt_scan_opal(unsigned long node,
  77                                    const char *uname, int depth, void *data)
  78 {
  79         const void *basep, *entryp, *sizep;
  80         int basesz, entrysz, runtimesz;
  81
  82         if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
  83                 return 0;
  84
  85         basep  = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
  86         entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
  87         sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);
  88
  89         if (!basep || !entryp || !sizep)
  90                 return 1;
  91
  92         opal.base = of_read_number(basep, basesz/4);
  93         opal.entry = of_read_number(entryp, entrysz/4);
  94         opal.size = of_read_number(sizep, runtimesz/4);
  95
  96         pr_debug("OPAL Base  = 0x%llx (basep=%p basesz=%d)\n",
  97                  opal.base, basep, basesz);
  98         pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
  99                  opal.entry, entryp, entrysz);
 100         pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
 101                  opal.size, sizep, runtimesz);
 102
 103         powerpc_firmware_features |= FW_FEATURE_OPAL;
 104         if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
 105                 powerpc_firmware_features |= FW_FEATURE_OPALv2;
 106                 powerpc_firmware_features |= FW_FEATURE_OPALv3;
 107                 pr_info("OPAL V3 detected !\n");
 108         } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
 109                 powerpc_firmware_features |= FW_FEATURE_OPALv2;
 110                 pr_info("OPAL V2 detected !\n");
 111         } else {
 112                 pr_info("OPAL V1 detected !\n");
 113         }
 114
 115         /* Reinit all cores with the right endian */
 116         opal_reinit_cores();
 117
 118         /* Restore some bits */
 119         if (cur_cpu_spec->cpu_restore)
 120                 cur_cpu_spec->cpu_restore();
 121
 122         return 1;
 123 }
 124
 125 int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
 126                                    const char *uname, int depth, void *data)
 127 {
 128         int i, psize, size;
 129         const __be32 *prop;
 130
 131         if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
 132                 return 0;
 133
 134         prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);
 135
 136         if (!prop)
 137                 return 1;
 138
 139         pr_debug("Found machine check recoverable ranges.\n");
 140
 141         /*
 142          * Calculate number of available entries.
 143          *
 144          * Each recoverable address range entry is (start address, len,
 145          * recovery address), 2 cells each for start and recovery address,
 146          * 1 cell for len, totalling 5 cells per entry.
 147          */
 148         mc_recoverable_range_len = psize / (sizeof(*prop) * 5);
 149
 150         /* Sanity check */
 151         if (!mc_recoverable_range_len)
 152                 return 1;
 153
 154         /* Size required to hold all the entries. */
 155         size = mc_recoverable_range_len *
 156                         sizeof(struct mcheck_recoverable_range);
 157
 158         /*
 159          * Allocate a buffer to hold the MC recoverable ranges. We would be
 160          * accessing them in real mode, hence it needs to be within
 161          * RMO region.
 162          */
 163         mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64),
 164                                                         ppc64_rma_size));
 165         memset(mc_recoverable_range, 0, size);
 166
 167         for (i = 0; i < mc_recoverable_range_len; i++) {
 168                 mc_recoverable_range[i].start_addr =
 169                                         of_read_number(prop + (i * 5) + 0, 2);
 170                 mc_recoverable_range[i].end_addr =
 171                                         mc_recoverable_range[i].start_addr +
 172                                         of_read_number(prop + (i * 5) + 2, 1);
 173                 mc_recoverable_range[i].recover_addr =
 174                                         of_read_number(prop + (i * 5) + 3, 2);
 175
 176                 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
 177                                 mc_recoverable_range[i].start_addr,
 178                                 mc_recoverable_range[i].end_addr,
 179                                 mc_recoverable_range[i].recover_addr);
 180         }
 181         return 1;
 182 }
 183
 184 static int __init opal_register_exception_handlers(void)
 185 {
 186 #ifdef __BIG_ENDIAN__
 187         u64 glue;
 188
 189         if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
 190                 return -ENODEV;
 191
 192         /* Hookup some exception handlers except machine check. We use the
 193          * fwnmi area at 0x7000 to provide the glue space to OPAL
 194          */
 195         glue = 0x7000;
 196
 197         /*
 198          * Check if we are running on newer firmware that exports
 199          * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
 200          * the HMI interrupt and we catch it directly in Linux.
 201          *
 202          * For older firmware (i.e currently released POWER8 System Firmware
 203          * as of today <= SV810_087), we fallback to old behavior and let OPAL
 204          * patch the HMI vector and handle it inside OPAL firmware.
 205          *
 206          * For newer firmware (in development/yet to be released) we will
 207          * start catching/handling HMI directly in Linux.
 208          */
 209         if (!opal_check_token(OPAL_HANDLE_HMI)) {
 210                 pr_info("opal: Old firmware detected, OPAL handles HMIs.\n");
 211                 opal_register_exception_handler(
 212                                 OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
 213                                 0, glue);
 214                 glue += 128;
 215         }
 216
 217         opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
 218 #endif
 219
 220         return 0;
 221 }
 222 machine_early_initcall(powernv, opal_register_exception_handlers);
 223
 224 int opal_notifier_register(struct notifier_block *nb)
 225 {
 226         if (!nb) {
 227                 pr_warning("%s: Invalid argument (%p)\n",
 228                            __func__, nb);
 229                 return -EINVAL;
 230         }
 231
 232         atomic_notifier_chain_register(&opal_notifier_head, nb);
 233         return 0;
 234 }
 235 EXPORT_SYMBOL_GPL(opal_notifier_register);
 236
 237 int opal_notifier_unregister(struct notifier_block *nb)
 238 {
 239         if (!nb) {
 240                 pr_warning("%s: Invalid argument (%p)\n",
 241                            __func__, nb);
 242                 return -EINVAL;
 243         }
 244
 245         atomic_notifier_chain_unregister(&opal_notifier_head, nb);
 246         return 0;
 247 }
 248 EXPORT_SYMBOL_GPL(opal_notifier_unregister);
 249
 250 static void opal_do_notifier(uint64_t events)
 251 {
 252         unsigned long flags;
 253         uint64_t changed_mask;
 254
 255         if (atomic_read(&opal_notifier_hold))
 256                 return;
 257
 258         spin_lock_irqsave(&opal_notifier_lock, flags);
 259         changed_mask = last_notified_mask ^ events;
 260         last_notified_mask = events;
 261         spin_unlock_irqrestore(&opal_notifier_lock, flags);
 262
 263         /*
 264          * We feed with the event bits and changed bits for
 265          * enough information to the callback.
 266          */
 267         atomic_notifier_call_chain(&opal_notifier_head,
 268                                    events, (void *)changed_mask);
 269 }
 270
 271 void opal_notifier_update_evt(uint64_t evt_mask,
 272                               uint64_t evt_val)
 273 {
 274         unsigned long flags;
 275
 276         spin_lock_irqsave(&opal_notifier_lock, flags);
 277         last_notified_mask &= ~evt_mask;
 278         last_notified_mask |= evt_val;
 279         spin_unlock_irqrestore(&opal_notifier_lock, flags);
 280 }
 281
 282 void opal_notifier_enable(void)
 283 {
 284         int64_t rc;
 285         __be64 evt = 0;
 286
 287         atomic_set(&opal_notifier_hold, 0);
 288
 289         /* Process pending events */
 290         rc = opal_poll_events(&evt);
 291         if (rc == OPAL_SUCCESS && evt)
 292                 opal_do_notifier(be64_to_cpu(evt));
 293 }
 294
 295 void opal_notifier_disable(void)
 296 {
 297         atomic_set(&opal_notifier_hold, 1);
 298 }
 299
 300 /*
 301  * Opal message notifier based on message type. Allow subscribers to get
 302  * notified for specific messgae type.
 303  */
 304 int opal_message_notifier_register(enum OpalMessageType msg_type,
 305                                         struct notifier_block *nb)
 306 {
 307         if (!nb) {
 308                 pr_warning("%s: Invalid argument (%p)\n",
 309                            __func__, nb);
 310                 return -EINVAL;
 311         }
 312         if (msg_type > OPAL_MSG_TYPE_MAX) {
 313                 pr_warning("%s: Invalid message type argument (%d)\n",
 314                            __func__, msg_type);
 315                 return -EINVAL;
 316         }
 317         return atomic_notifier_chain_register(
 318                                 &opal_msg_notifier_head[msg_type], nb);
 319 }
 320
 321 static void opal_message_do_notify(uint32_t msg_type, void *msg)
 322 {
 323         /* notify subscribers */
 324         atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type],
 325                                         msg_type, msg);
 326 }
 327
 328 static void opal_handle_message(void)
 329 {
 330         s64 ret;
 331         /*
 332          * TODO: pre-allocate a message buffer depending on opal-msg-size
 333          * value in /proc/device-tree.
 334          */
 335         static struct opal_msg msg;
 336         u32 type;
 337
 338         ret = opal_get_msg(__pa(&msg), sizeof(msg));
 339         /* No opal message pending. */
 340         if (ret == OPAL_RESOURCE)
 341                 return;
 342
 343         /* check for errors. */
 344         if (ret) {
 345                 pr_warning("%s: Failed to retrieve opal message, err=%lld\n",
 346                                 __func__, ret);
 347                 return;
 348         }
 349
 350         type = be32_to_cpu(msg.msg_type);
 351
 352         /* Sanity check */
 353         if (type > OPAL_MSG_TYPE_MAX) {
 354                 pr_warning("%s: Unknown message type: %u\n", __func__, type);
 355                 return;
 356         }
 357         opal_message_do_notify(type, (void *)&msg);
 358 }
 359
 360 static int opal_message_notify(struct notifier_block *nb,
 361                           unsigned long events, void *change)
 362 {
 363         if (events & OPAL_EVENT_MSG_PENDING)
 364                 opal_handle_message();
 365         return 0;
 366 }
 367
 368 static struct notifier_block opal_message_nb = {
 369         .notifier_call  = opal_message_notify,
 370         .next           = NULL,
 371         .priority       = 0,
 372 };
 373
 374 static int __init opal_message_init(void)
 375 {
 376         int ret, i;
 377
 378         for (i = 0; i < OPAL_MSG_TYPE_MAX; i++)
 379                 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]);
 380
 381         ret = opal_notifier_register(&opal_message_nb);
 382         if (ret) {
 383                 pr_err("%s: Can't register OPAL event notifier (%d)\n",
 384                        __func__, ret);
 385                 return ret;
 386         }
 387         return 0;
 388 }
 389 machine_early_initcall(powernv, opal_message_init);
 390
 391 int opal_get_chars(uint32_t vtermno, char *buf, int count)
 392 {
 393         s64 rc;
 394         __be64 evt, len;
 395
 396         if (!opal.entry)
 397                 return -ENODEV;
 398         opal_poll_events(&evt);
 399         if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
 400                 return 0;
 401         len = cpu_to_be64(count);
 402         rc = opal_console_read(vtermno, &len, buf);
 403         if (rc == OPAL_SUCCESS)
 404                 return be64_to_cpu(len);
 405         return 0;
 406 }
 407
 408 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
 409 {
 410         int written = 0;
 411         __be64 olen;
 412         s64 len, rc;
 413         unsigned long flags;
 414         __be64 evt;
 415
 416         if (!opal.entry)
 417                 return -ENODEV;
 418
 419         /* We want put_chars to be atomic to avoid mangling of hvsi
 420          * packets. To do that, we first test for room and return
 421          * -EAGAIN if there isn't enough.
 422          *
 423          * Unfortunately, opal_console_write_buffer_space() doesn't
 424          * appear to work on opal v1, so we just assume there is
 425          * enough room and be done with it
 426          */
 427         spin_lock_irqsave(&opal_write_lock, flags);
 428         if (firmware_has_feature(FW_FEATURE_OPALv2)) {
 429                 rc = opal_console_write_buffer_space(vtermno, &olen);
 430                 len = be64_to_cpu(olen);
 431                 if (rc || len < total_len) {
 432                         spin_unlock_irqrestore(&opal_write_lock, flags);
 433                         /* Closed -> drop characters */
 434                         if (rc)
 435                                 return total_len;
 436                         opal_poll_events(NULL);
 437                         return -EAGAIN;
 438                 }
 439         }
 440
 441         /* We still try to handle partial completions, though they
 442          * should no longer happen.
 443          */
 444         rc = OPAL_BUSY;
 445         while(total_len > 0 && (rc == OPAL_BUSY ||
 446                                 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
 447                 olen = cpu_to_be64(total_len);
 448                 rc = opal_console_write(vtermno, &olen, data);
 449                 len = be64_to_cpu(olen);
 450
 451                 /* Closed or other error drop */
 452                 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
 453                     rc != OPAL_BUSY_EVENT) {
 454                         written = total_len;
 455                         break;
 456                 }
 457                 if (rc == OPAL_SUCCESS) {
 458                         total_len -= len;
 459                         data += len;
 460                         written += len;
 461                 }
 462                 /* This is a bit nasty but we need that for the console to
 463                  * flush when there aren't any interrupts. We will clean
 464                  * things a bit later to limit that to synchronous path
 465                  * such as the kernel console and xmon/udbg
 466                  */
 467                 do
 468                         opal_poll_events(&evt);
 469                 while(rc == OPAL_SUCCESS &&
 470                         (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT));
 471         }
 472         spin_unlock_irqrestore(&opal_write_lock, flags);
 473         return written;
 474 }
 475
 476 static int opal_recover_mce(struct pt_regs *regs,
 477                                         struct machine_check_event *evt)
 478 {
 479         int recovered = 0;
 480         uint64_t ea = get_mce_fault_addr(evt);
 481
 482         if (!(regs->msr & MSR_RI)) {
 483                 /* If MSR_RI isn't set, we cannot recover */
 484                 recovered = 0;
 485         } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
 486                 /* Platform corrected itself */
 487                 recovered = 1;
 488         } else if (ea && !is_kernel_addr(ea)) {
 489                 /*
 490                  * Faulting address is not in kernel text. We should be fine.
 491                  * We need to find which process uses this address.
 492                  * For now, kill the task if we have received exception when
 493                  * in userspace.
 494                  *
 495                  * TODO: Queue up this address for hwpoisioning later.
 496                  */
 497                 if (user_mode(regs) && !is_global_init(current)) {
 498                         _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
 499                         recovered = 1;
 500                 } else
 501                         recovered = 0;
 502         } else if (user_mode(regs) && !is_global_init(current) &&
 503                 evt->severity == MCE_SEV_ERROR_SYNC) {
 504                 /*
 505                  * If we have received a synchronous error when in userspace
 506                  * kill the task.
 507                  */
 508                 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
 509                 recovered = 1;
 510         }
 511         return recovered;
 512 }
 513
 514 int opal_machine_check(struct pt_regs *regs)
 515 {
 516         struct machine_check_event evt;
 517
 518         if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
 519                 return 0;
 520
 521         /* Print things out */
 522         if (evt.version != MCE_V1) {
 523                 pr_err("Machine Check Exception, Unknown event version %d !\n",
 524                        evt.version);
 525                 return 0;
 526         }
 527         machine_check_print_event_info(&evt);
 528
 529         if (opal_recover_mce(regs, &evt))
 530                 return 1;
 531         return 0;
 532 }
 533
 534 /* Early hmi handler called in real mode. */
 535 int opal_hmi_exception_early(struct pt_regs *regs)
 536 {
 537         s64 rc;
 538
 539         /*
 540          * call opal hmi handler. Pass paca address as token.
 541          * The return value OPAL_SUCCESS is an indication that there is
 542          * an HMI event generated waiting to pull by Linux.
 543          */
 544         rc = opal_handle_hmi();
 545         if (rc == OPAL_SUCCESS) {
 546                 local_paca->hmi_event_available = 1;
 547                 return 1;
 548         }
 549         return 0;
 550 }
 551
 552 /* HMI exception handler called in virtual mode during check_irq_replay. */
 553 int opal_handle_hmi_exception(struct pt_regs *regs)
 554 {
 555         s64 rc;
 556         __be64 evt = 0;
 557
 558         /*
 559          * Check if HMI event is available.
 560          * if Yes, then call opal_poll_events to pull opal messages and
 561          * process them.
 562          */
 563         if (!local_paca->hmi_event_available)
 564                 return 0;
 565
 566         local_paca->hmi_event_available = 0;
 567         rc = opal_poll_events(&evt);
 568         if (rc == OPAL_SUCCESS && evt)
 569                 opal_do_notifier(be64_to_cpu(evt));
 570
 571         return 1;
 572 }
 573
 574 static uint64_t find_recovery_address(uint64_t nip)
 575 {
 576         int i;
 577
 578         for (i = 0; i < mc_recoverable_range_len; i++)
 579                 if ((nip >= mc_recoverable_range[i].start_addr) &&
 580                     (nip < mc_recoverable_range[i].end_addr))
 581                     return mc_recoverable_range[i].recover_addr;
 582         return 0;
 583 }
 584
 585 bool opal_mce_check_early_recovery(struct pt_regs *regs)
 586 {
 587         uint64_t recover_addr = 0;
 588
 589         if (!opal.base || !opal.size)
 590                 goto out;
 591
 592         if ((regs->nip >= opal.base) &&
 593                         (regs->nip <= (opal.base + opal.size)))
 594                 recover_addr = find_recovery_address(regs->nip);
 595
 596         /*
 597          * Setup regs->nip to rfi into fixup address.
 598          */
 599         if (recover_addr)
 600                 regs->nip = recover_addr;
 601
 602 out:
 603         return !!recover_addr;
 604 }
 605
 606 static irqreturn_t opal_interrupt(int irq, void *data)
 607 {
 608         __be64 events;
 609
 610         opal_handle_interrupt(virq_to_hw(irq), &events);
 611
 612         opal_do_notifier(be64_to_cpu(events));
 613
 614         return IRQ_HANDLED;
 615 }
 616
 617 static int opal_sysfs_init(void)
 618 {
 619         opal_kobj = kobject_create_and_add("opal", firmware_kobj);
 620         if (!opal_kobj) {
 621                 pr_warn("kobject_create_and_add opal failed\n");
 622                 return -ENOMEM;
 623         }
 624
 625         return 0;
 626 }
 627
 628 static void __init opal_dump_region_init(void)
 629 {
 630         void *addr;
 631         uint64_t size;
 632         int rc;
 633
 634         /* Register kernel log buffer */
 635         addr = log_buf_addr_get();
 636         size = log_buf_len_get();
 637         rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
 638                                        __pa(addr), size);
 639         /* Don't warn if this is just an older OPAL that doesn't
 640          * know about that call
 641          */
 642         if (rc && rc != OPAL_UNSUPPORTED)
 643                 pr_warn("DUMP: Failed to register kernel log buffer. "
 644                         "rc = %d\n", rc);
 645 }
 646
 647 static void opal_ipmi_init(struct device_node *opal_node)
 648 {
 649         struct device_node *np;
 650
 651         for_each_child_of_node(opal_node, np)
 652                 if (of_device_is_compatible(np, "ibm,opal-ipmi"))
 653                         of_platform_device_create(np, NULL, NULL);
 654 }
 655
 656 static int __init opal_init(void)
 657 {
 658         struct device_node *np, *consoles;
 659         const __be32 *irqs;
 660         int rc, i, irqlen;
 661
 662         opal_node = of_find_node_by_path("/ibm,opal");
 663         if (!opal_node) {
 664                 pr_warn("opal: Node not found\n");
 665                 return -ENODEV;
 666         }
 667
 668         /* Register OPAL consoles if any ports */
 669         if (firmware_has_feature(FW_FEATURE_OPALv2))
 670                 consoles = of_find_node_by_path("/ibm,opal/consoles");
 671         else
 672                 consoles = of_node_get(opal_node);
 673         if (consoles) {
 674                 for_each_child_of_node(consoles, np) {
 675                         if (strcmp(np->name, "serial"))
 676                                 continue;
 677                         of_platform_device_create(np, NULL, NULL);
 678                 }
 679                 of_node_put(consoles);
 680         }
 681
 682         /* Find all OPAL interrupts and request them */
 683         irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
 684         pr_debug("opal: Found %d interrupts reserved for OPAL\n",
 685                  irqs ? (irqlen / 4) : 0);
 686         opal_irq_count = irqlen / 4;
 687         opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL);
 688         for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
 689                 unsigned int hwirq = be32_to_cpup(irqs);
 690                 unsigned int irq = irq_create_mapping(NULL, hwirq);
 691                 if (irq == NO_IRQ) {
 692                         pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
 693                         continue;
 694                 }
 695                 rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
 696                 if (rc)
 697                         pr_warning("opal: Error %d requesting irq %d"
 698                                    " (0x%x)\n", rc, irq, hwirq);
 699                 opal_irqs[i] = irq;
 700         }
 701
 702         /* Create "opal" kobject under /sys/firmware */
 703         rc = opal_sysfs_init();
 704         if (rc == 0) {
 705                 /* Setup dump region interface */
 706                 opal_dump_region_init();
 707                 /* Setup error log interface */
 708                 rc = opal_elog_init();
 709                 /* Setup code update interface */
 710                 opal_flash_init();
 711                 /* Setup platform dump extract interface */
 712                 opal_platform_dump_init();
 713                 /* Setup system parameters interface */
 714                 opal_sys_param_init();
 715                 /* Setup message log interface. */
 716                 opal_msglog_init();
 717         }
 718
 719         opal_ipmi_init(opal_node);
 720
 721         return 0;
 722 }
 723 machine_subsys_initcall(powernv, opal_init);
 724
 725 void opal_shutdown(void)
 726 {
 727         unsigned int i;
 728         long rc = OPAL_BUSY;
 729
 730         /* First free interrupts, which will also mask them */
 731         for (i = 0; i < opal_irq_count; i++) {
 732                 if (opal_irqs[i])
 733                         free_irq(opal_irqs[i], NULL);
 734                 opal_irqs[i] = 0;
 735         }
 736
 737         /*
 738          * Then sync with OPAL which ensure anything that can
 739          * potentially write to our memory has completed such
 740          * as an ongoing dump retrieval
 741          */
 742         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 743                 rc = opal_sync_host_reboot();
 744                 if (rc == OPAL_BUSY)
 745                         opal_poll_events(NULL);
 746                 else
 747                         mdelay(10);
 748         }
 749
 750         /* Unregister memory dump region */
 751         opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
 752 }
 753
 754 /* Export this so that test modules can use it */
 755 EXPORT_SYMBOL_GPL(opal_invalid_call);
 756 EXPORT_SYMBOL_GPL(opal_ipmi_send);
 757 EXPORT_SYMBOL_GPL(opal_ipmi_recv);
 758
 759 /* Convert a region of vmalloc memory to an opal sg list */
 760 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
 761                                              unsigned long vmalloc_size)
 762 {
 763         struct opal_sg_list *sg, *first = NULL;
 764         unsigned long i = 0;
 765
 766         sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
 767         if (!sg)
 768                 goto nomem;
 769
 770         first = sg;
 771
 772         while (vmalloc_size > 0) {
 773                 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
 774                 uint64_t length = min(vmalloc_size, PAGE_SIZE);
 775
 776                 sg->entry[i].data = cpu_to_be64(data);
 777                 sg->entry[i].length = cpu_to_be64(length);
 778                 i++;
 779
 780                 if (i >= SG_ENTRIES_PER_NODE) {
 781                         struct opal_sg_list *next;
 782
 783                         next = kzalloc(PAGE_SIZE, GFP_KERNEL);
 784                         if (!next)
 785                                 goto nomem;
 786
 787                         sg->length = cpu_to_be64(
 788                                         i * sizeof(struct opal_sg_entry) + 16);
 789                         i = 0;
 790                         sg->next = cpu_to_be64(__pa(next));
 791                         sg = next;
 792                 }
 793
 794                 vmalloc_addr += length;
 795                 vmalloc_size -= length;
 796         }
 797
 798         sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
 799
 800         return first;
 801
 802 nomem:
 803         pr_err("%s : Failed to allocate memory\n", __func__);
 804         opal_free_sg_list(first);
 805         return NULL;
 806 }
 807
 808 void opal_free_sg_list(struct opal_sg_list *sg)
 809 {
 810         while (sg) {
 811                 uint64_t next = be64_to_cpu(sg->next);
 812
 813                 kfree(sg);
 814
 815                 if (next)
 816                         sg = __va(next);
 817                 else
 818                         sg = NULL;
 819         }
 820 }
 821
 822 EXPORT_SYMBOL_GPL(opal_poll_events);
 823 EXPORT_SYMBOL_GPL(opal_rtc_read);
 824 EXPORT_SYMBOL_GPL(opal_rtc_write);
 825 EXPORT_SYMBOL_GPL(opal_tpo_read);
 826 EXPORT_SYMBOL_GPL(opal_tpo_write);