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 static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic)
 348 {
 349         unsigned long flags = 0 /* shut up gcc */;
 350         int written;
 351         __be64 olen;
 352         s64 rc;
 353
 354         if (!opal.entry)
 355                 return -ENODEV;
 356
 357         if (atomic)
 358                 spin_lock_irqsave(&opal_write_lock, flags);
 359         rc = opal_console_write_buffer_space(vtermno, &olen);
 360         if (rc || be64_to_cpu(olen) < total_len) {
 361                 /* Closed -> drop characters */
 362                 if (rc)
 363                         written = total_len;
 364                 else
 365                         written = -EAGAIN;
 366                 goto out;
 367         }
 368
 369         /* Should not get a partial write here because space is available. */
 370         olen = cpu_to_be64(total_len);
 371         rc = opal_console_write(vtermno, &olen, data);
 372         if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 373                 if (rc == OPAL_BUSY_EVENT) {
 374                         mdelay(OPAL_BUSY_DELAY_MS);
 375                         opal_poll_events(NULL);
 376                 } else if (rc == OPAL_BUSY_EVENT) {
 377                         mdelay(OPAL_BUSY_DELAY_MS);
 378                 }
 379                 written = -EAGAIN;
 380                 goto out;
 381         }
 382
 383         /* Closed or other error drop */
 384         if (rc != OPAL_SUCCESS) {
 385                 written = opal_error_code(rc);
 386                 goto out;
 387         }
 388
 389         written = be64_to_cpu(olen);
 390         if (written < total_len) {
 391                 if (atomic) {
 392                         /* Should not happen */
 393                         pr_warn("atomic console write returned partial "
 394                                 "len=%d written=%d\n", total_len, written);
 395                 }
 396                 if (!written)
 397                         written = -EAGAIN;
 398         }
 399
 400 out:
 401         if (atomic)
 402                 spin_unlock_irqrestore(&opal_write_lock, flags);
 403
 404         /* In the -EAGAIN case, callers loop, so we have to flush the console
 405          * here in case they have interrupts off (and we don't want to wait
 406          * for async flushing if we can make immediate progress here). If
 407          * necessary the API could be made entirely non-flushing if the
 408          * callers had a ->flush API to use.
 409          */
 410         if (written == -EAGAIN)
 411                 opal_flush_console(vtermno);
 412
 413         return written;
 414 }
 415
 416 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
 417 {
 418         return __opal_put_chars(vtermno, data, total_len, false);
 419 }
 420
 421 /*
 422  * opal_put_chars_atomic will not perform partial-writes. Data will be
 423  * atomically written to the terminal or not at all. This is not strictly
 424  * true at the moment because console space can race with OPAL's console
 425  * writes.
 426  */
 427 int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len)
 428 {
 429         return __opal_put_chars(vtermno, data, total_len, true);
 430 }
 431
 432 int opal_flush_console(uint32_t vtermno)
 433 {
 434         s64 rc;
 435
 436         if (!opal_check_token(OPAL_CONSOLE_FLUSH)) {
 437                 __be64 evt;
 438
 439                 WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n");
 440                 /*
 441                  * If OPAL_CONSOLE_FLUSH is not implemented in the firmware,
 442                  * the console can still be flushed by calling the polling
 443                  * function while it has OPAL_EVENT_CONSOLE_OUTPUT events.
 444                  */
 445                 do {
 446                         opal_poll_events(&evt);
 447                 } while (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT);
 448
 449                 return OPAL_SUCCESS;
 450         }
 451
 452         do  {
 453                 rc = OPAL_BUSY;
 454                 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 455                         rc = opal_console_flush(vtermno);
 456                         if (rc == OPAL_BUSY_EVENT) {
 457                                 mdelay(OPAL_BUSY_DELAY_MS);
 458                                 opal_poll_events(NULL);
 459                         } else if (rc == OPAL_BUSY) {
 460                                 mdelay(OPAL_BUSY_DELAY_MS);
 461                         }
 462                 }
 463         } while (rc == OPAL_PARTIAL); /* More to flush */
 464
 465         return opal_error_code(rc);
 466 }
 467
 468 static int opal_recover_mce(struct pt_regs *regs,
 469                                         struct machine_check_event *evt)
 470 {
 471         int recovered = 0;
 472
 473         if (!(regs->msr & MSR_RI)) {
 474                 /* If MSR_RI isn't set, we cannot recover */
 475                 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
 476                 recovered = 0;
 477         } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
 478                 /* Platform corrected itself */
 479                 recovered = 1;
 480         } else if (evt->severity == MCE_SEV_FATAL) {
 481                 /* Fatal machine check */
 482                 pr_err("Machine check interrupt is fatal\n");
 483                 recovered = 0;
 484         }
 485
 486         if (!recovered && evt->severity == MCE_SEV_ERROR_SYNC) {
 487                 /*
 488                  * Try to kill processes if we get a synchronous machine check
 489                  * (e.g., one caused by execution of this instruction). This
 490                  * will devolve into a panic if we try to kill init or are in
 491                  * an interrupt etc.
 492                  *
 493                  * TODO: Queue up this address for hwpoisioning later.
 494                  * TODO: This is not quite right for d-side machine
 495                  *       checks ->nip is not necessarily the important
 496                  *       address.
 497                  */
 498                 if ((user_mode(regs))) {
 499                         _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
 500                         recovered = 1;
 501                 } else if (die_will_crash()) {
 502                         /*
 503                          * die() would kill the kernel, so better to go via
 504                          * the platform reboot code that will log the
 505                          * machine check.
 506                          */
 507                         recovered = 0;
 508                 } else {
 509                         die("Machine check", regs, SIGBUS);
 510                         recovered = 1;
 511                 }
 512         }
 513
 514         return recovered;
 515 }
 516
 517 void pnv_platform_error_reboot(struct pt_regs *regs, const char *msg)
 518 {
 519         panic_flush_kmsg_start();
 520
 521         pr_emerg("Hardware platform error: %s\n", msg);
 522         if (regs)
 523                 show_regs(regs);
 524         smp_send_stop();
 525
 526         panic_flush_kmsg_end();
 527
 528         /*
 529          * Don't bother to shut things down because this will
 530          * xstop the system.
 531          */
 532         if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg)
 533                                                 == OPAL_UNSUPPORTED) {
 534                 pr_emerg("Reboot type %d not supported for %s\n",
 535                                 OPAL_REBOOT_PLATFORM_ERROR, msg);
 536         }
 537
 538         /*
 539          * We reached here. There can be three possibilities:
 540          * 1. We are running on a firmware level that do not support
 541          *    opal_cec_reboot2()
 542          * 2. We are running on a firmware level that do not support
 543          *    OPAL_REBOOT_PLATFORM_ERROR reboot type.
 544          * 3. We are running on FSP based system that does not need
 545          *    opal to trigger checkstop explicitly for error analysis.
 546          *    The FSP PRD component would have already got notified
 547          *    about this error through other channels.
 548          * 4. We are running on a newer skiboot that by default does
 549          *    not cause a checkstop, drops us back to the kernel to
 550          *    extract context and state at the time of the error.
 551          */
 552
 553         panic(msg);
 554 }
 555
 556 int opal_machine_check(struct pt_regs *regs)
 557 {
 558         struct machine_check_event evt;
 559
 560         if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
 561                 return 0;
 562
 563         /* Print things out */
 564         if (evt.version != MCE_V1) {
 565                 pr_err("Machine Check Exception, Unknown event version %d !\n",
 566                        evt.version);
 567                 return 0;
 568         }
 569         machine_check_print_event_info(&evt, user_mode(regs));
 570
 571         if (opal_recover_mce(regs, &evt))
 572                 return 1;
 573
 574         pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception");
 575 }
 576
 577 /* Early hmi handler called in real mode. */
 578 int opal_hmi_exception_early(struct pt_regs *regs)
 579 {
 580         s64 rc;
 581
 582         /*
 583          * call opal hmi handler. Pass paca address as token.
 584          * The return value OPAL_SUCCESS is an indication that there is
 585          * an HMI event generated waiting to pull by Linux.
 586          */
 587         rc = opal_handle_hmi();
 588         if (rc == OPAL_SUCCESS) {
 589                 local_paca->hmi_event_available = 1;
 590                 return 1;
 591         }
 592         return 0;
 593 }
 594
 595 /* HMI exception handler called in virtual mode during check_irq_replay. */
 596 int opal_handle_hmi_exception(struct pt_regs *regs)
 597 {
 598         /*
 599          * Check if HMI event is available.
 600          * if Yes, then wake kopald to process them.
 601          */
 602         if (!local_paca->hmi_event_available)
 603                 return 0;
 604
 605         local_paca->hmi_event_available = 0;
 606         opal_wake_poller();
 607
 608         return 1;
 609 }
 610
 611 static uint64_t find_recovery_address(uint64_t nip)
 612 {
 613         int i;
 614
 615         for (i = 0; i < mc_recoverable_range_len; i++)
 616                 if ((nip >= mc_recoverable_range[i].start_addr) &&
 617                     (nip < mc_recoverable_range[i].end_addr))
 618                     return mc_recoverable_range[i].recover_addr;
 619         return 0;
 620 }
 621
 622 bool opal_mce_check_early_recovery(struct pt_regs *regs)
 623 {
 624         uint64_t recover_addr = 0;
 625
 626         if (!opal.base || !opal.size)
 627                 goto out;
 628
 629         if ((regs->nip >= opal.base) &&
 630                         (regs->nip < (opal.base + opal.size)))
 631                 recover_addr = find_recovery_address(regs->nip);
 632
 633         /*
 634          * Setup regs->nip to rfi into fixup address.
 635          */
 636         if (recover_addr)
 637                 regs->nip = recover_addr;
 638
 639 out:
 640         return !!recover_addr;
 641 }
 642
 643 static int opal_sysfs_init(void)
 644 {
 645         opal_kobj = kobject_create_and_add("opal", firmware_kobj);
 646         if (!opal_kobj) {
 647                 pr_warn("kobject_create_and_add opal failed\n");
 648                 return -ENOMEM;
 649         }
 650
 651         return 0;
 652 }
 653
 654 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
 655                                struct bin_attribute *bin_attr,
 656                                char *buf, loff_t off, size_t count)
 657 {
 658         return memory_read_from_buffer(buf, count, &off, bin_attr->private,
 659                                        bin_attr->size);
 660 }
 661
 662 static BIN_ATTR_RO(symbol_map, 0);
 663
 664 static void opal_export_symmap(void)
 665 {
 666         const __be64 *syms;
 667         unsigned int size;
 668         struct device_node *fw;
 669         int rc;
 670
 671         fw = of_find_node_by_path("/ibm,opal/firmware");
 672         if (!fw)
 673                 return;
 674         syms = of_get_property(fw, "symbol-map", &size);
 675         if (!syms || size != 2 * sizeof(__be64))
 676                 return;
 677
 678         /* Setup attributes */
 679         bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0]));
 680         bin_attr_symbol_map.size = be64_to_cpu(syms[1]);
 681
 682         rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map);
 683         if (rc)
 684                 pr_warn("Error %d creating OPAL symbols file\n", rc);
 685 }
 686
 687 static ssize_t export_attr_read(struct file *fp, struct kobject *kobj,
 688                                 struct bin_attribute *bin_attr, char *buf,
 689                                 loff_t off, size_t count)
 690 {
 691         return memory_read_from_buffer(buf, count, &off, bin_attr->private,
 692                                        bin_attr->size);
 693 }
 694
 695 /*
 696  * opal_export_attrs: creates a sysfs node for each property listed in
 697  * the device-tree under /ibm,opal/firmware/exports/
 698  * All new sysfs nodes are created under /opal/exports/.
 699  * This allows for reserved memory regions (e.g. HDAT) to be read.
 700  * The new sysfs nodes are only readable by root.
 701  */
 702 static void opal_export_attrs(void)
 703 {
 704         struct bin_attribute *attr;
 705         struct device_node *np;
 706         struct property *prop;
 707         struct kobject *kobj;
 708         u64 vals[2];
 709         int rc;
 710
 711         np = of_find_node_by_path("/ibm,opal/firmware/exports");
 712         if (!np)
 713                 return;
 714
 715         /* Create new 'exports' directory - /sys/firmware/opal/exports */
 716         kobj = kobject_create_and_add("exports", opal_kobj);
 717         if (!kobj) {
 718                 pr_warn("kobject_create_and_add() of exports failed\n");
 719                 return;
 720         }
 721
 722         for_each_property_of_node(np, prop) {
 723                 if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle"))
 724                         continue;
 725
 726                 if (of_property_read_u64_array(np, prop->name, &vals[0], 2))
 727                         continue;
 728
 729                 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
 730
 731                 if (attr == NULL) {
 732                         pr_warn("Failed kmalloc for bin_attribute!");
 733                         continue;
 734                 }
 735
 736                 sysfs_bin_attr_init(attr);
 737                 attr->attr.name = kstrdup(prop->name, GFP_KERNEL);
 738                 attr->attr.mode = 0400;
 739                 attr->read = export_attr_read;
 740                 attr->private = __va(vals[0]);
 741                 attr->size = vals[1];
 742
 743                 if (attr->attr.name == NULL) {
 744                         pr_warn("Failed kstrdup for bin_attribute attr.name");
 745                         kfree(attr);
 746                         continue;
 747                 }
 748
 749                 rc = sysfs_create_bin_file(kobj, attr);
 750                 if (rc) {
 751                         pr_warn("Error %d creating OPAL sysfs exports/%s file\n",
 752                                  rc, prop->name);
 753                         kfree(attr->attr.name);
 754                         kfree(attr);
 755                 }
 756         }
 757
 758         of_node_put(np);
 759 }
 760
 761 static void __init opal_dump_region_init(void)
 762 {
 763         void *addr;
 764         uint64_t size;
 765         int rc;
 766
 767         if (!opal_check_token(OPAL_REGISTER_DUMP_REGION))
 768                 return;
 769
 770         /* Register kernel log buffer */
 771         addr = log_buf_addr_get();
 772         if (addr == NULL)
 773                 return;
 774
 775         size = log_buf_len_get();
 776         if (size == 0)
 777                 return;
 778
 779         rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
 780                                        __pa(addr), size);
 781         /* Don't warn if this is just an older OPAL that doesn't
 782          * know about that call
 783          */
 784         if (rc && rc != OPAL_UNSUPPORTED)
 785                 pr_warn("DUMP: Failed to register kernel log buffer. "
 786                         "rc = %d\n", rc);
 787 }
 788
 789 static void opal_pdev_init(const char *compatible)
 790 {
 791         struct device_node *np;
 792
 793         for_each_compatible_node(np, NULL, compatible)
 794                 of_platform_device_create(np, NULL, NULL);
 795 }
 796
 797 static void __init opal_imc_init_dev(void)
 798 {
 799         struct device_node *np;
 800
 801         np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT);
 802         if (np)
 803                 of_platform_device_create(np, NULL, NULL);
 804 }
 805
 806 static int kopald(void *unused)
 807 {
 808         unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1;
 809
 810         set_freezable();
 811         do {
 812                 try_to_freeze();
 813
 814                 opal_handle_events();
 815
 816                 set_current_state(TASK_INTERRUPTIBLE);
 817                 if (opal_have_pending_events())
 818                         __set_current_state(TASK_RUNNING);
 819                 else
 820                         schedule_timeout(timeout);
 821
 822         } while (!kthread_should_stop());
 823
 824         return 0;
 825 }
 826
 827 void opal_wake_poller(void)
 828 {
 829         if (kopald_tsk)
 830                 wake_up_process(kopald_tsk);
 831 }
 832
 833 static void opal_init_heartbeat(void)
 834 {
 835         /* Old firwmware, we assume the HVC heartbeat is sufficient */
 836         if (of_property_read_u32(opal_node, "ibm,heartbeat-ms",
 837                                  &opal_heartbeat) != 0)
 838                 opal_heartbeat = 0;
 839
 840         if (opal_heartbeat)
 841                 kopald_tsk = kthread_run(kopald, NULL, "kopald");
 842 }
 843
 844 static int __init opal_init(void)
 845 {
 846         struct device_node *np, *consoles, *leds;
 847         int rc;
 848
 849         opal_node = of_find_node_by_path("/ibm,opal");
 850         if (!opal_node) {
 851                 pr_warn("Device node not found\n");
 852                 return -ENODEV;
 853         }
 854
 855         /* Register OPAL consoles if any ports */
 856         consoles = of_find_node_by_path("/ibm,opal/consoles");
 857         if (consoles) {
 858                 for_each_child_of_node(consoles, np) {
 859                         if (strcmp(np->name, "serial"))
 860                                 continue;
 861                         of_platform_device_create(np, NULL, NULL);
 862                 }
 863                 of_node_put(consoles);
 864         }
 865
 866         /* Initialise OPAL messaging system */
 867         opal_message_init();
 868
 869         /* Initialise OPAL asynchronous completion interface */
 870         opal_async_comp_init();
 871
 872         /* Initialise OPAL sensor interface */
 873         opal_sensor_init();
 874
 875         /* Initialise OPAL hypervisor maintainence interrupt handling */
 876         opal_hmi_handler_init();
 877
 878         /* Create i2c platform devices */
 879         opal_pdev_init("ibm,opal-i2c");
 880
 881         /* Handle non-volatile memory devices */
 882         opal_pdev_init("pmem-region");
 883
 884         /* Setup a heatbeat thread if requested by OPAL */
 885         opal_init_heartbeat();
 886
 887         /* Detect In-Memory Collection counters and create devices*/
 888         opal_imc_init_dev();
 889
 890         /* Create leds platform devices */
 891         leds = of_find_node_by_path("/ibm,opal/leds");
 892         if (leds) {
 893                 of_platform_device_create(leds, "opal_leds", NULL);
 894                 of_node_put(leds);
 895         }
 896
 897         /* Initialise OPAL message log interface */
 898         opal_msglog_init();
 899
 900         /* Create "opal" kobject under /sys/firmware */
 901         rc = opal_sysfs_init();
 902         if (rc == 0) {
 903                 /* Export symbol map to userspace */
 904                 opal_export_symmap();
 905                 /* Setup dump region interface */
 906                 opal_dump_region_init();
 907                 /* Setup error log interface */
 908                 rc = opal_elog_init();
 909                 /* Setup code update interface */
 910                 opal_flash_update_init();
 911                 /* Setup platform dump extract interface */
 912                 opal_platform_dump_init();
 913                 /* Setup system parameters interface */
 914                 opal_sys_param_init();
 915                 /* Setup message log sysfs interface. */
 916                 opal_msglog_sysfs_init();
 917         }
 918
 919         /* Export all properties */
 920         opal_export_attrs();
 921
 922         /* Initialize platform devices: IPMI backend, PRD & flash interface */
 923         opal_pdev_init("ibm,opal-ipmi");
 924         opal_pdev_init("ibm,opal-flash");
 925         opal_pdev_init("ibm,opal-prd");
 926
 927         /* Initialise platform device: oppanel interface */
 928         opal_pdev_init("ibm,opal-oppanel");
 929
 930         /* Initialise OPAL kmsg dumper for flushing console on panic */
 931         opal_kmsg_init();
 932
 933         /* Initialise OPAL powercap interface */
 934         opal_powercap_init();
 935
 936         /* Initialise OPAL Power-Shifting-Ratio interface */
 937         opal_psr_init();
 938
 939         /* Initialise OPAL sensor groups */
 940         opal_sensor_groups_init();
 941
 942         return 0;
 943 }
 944 machine_subsys_initcall(powernv, opal_init);
 945
 946 void opal_shutdown(void)
 947 {
 948         long rc = OPAL_BUSY;
 949
 950         opal_event_shutdown();
 951
 952         /*
 953          * Then sync with OPAL which ensure anything that can
 954          * potentially write to our memory has completed such
 955          * as an ongoing dump retrieval
 956          */
 957         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 958                 rc = opal_sync_host_reboot();
 959                 if (rc == OPAL_BUSY)
 960                         opal_poll_events(NULL);
 961                 else
 962                         mdelay(10);
 963         }
 964
 965         /* Unregister memory dump region */
 966         if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION))
 967                 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
 968 }
 969
 970 /* Export this so that test modules can use it */
 971 EXPORT_SYMBOL_GPL(opal_invalid_call);
 972 EXPORT_SYMBOL_GPL(opal_xscom_read);
 973 EXPORT_SYMBOL_GPL(opal_xscom_write);
 974 EXPORT_SYMBOL_GPL(opal_ipmi_send);
 975 EXPORT_SYMBOL_GPL(opal_ipmi_recv);
 976 EXPORT_SYMBOL_GPL(opal_flash_read);
 977 EXPORT_SYMBOL_GPL(opal_flash_write);
 978 EXPORT_SYMBOL_GPL(opal_flash_erase);
 979 EXPORT_SYMBOL_GPL(opal_prd_msg);
 980 EXPORT_SYMBOL_GPL(opal_check_token);
 981
 982 /* Convert a region of vmalloc memory to an opal sg list */
 983 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
 984                                              unsigned long vmalloc_size)
 985 {
 986         struct opal_sg_list *sg, *first = NULL;
 987         unsigned long i = 0;
 988
 989         sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
 990         if (!sg)
 991                 goto nomem;
 992
 993         first = sg;
 994
 995         while (vmalloc_size > 0) {
 996                 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
 997                 uint64_t length = min(vmalloc_size, PAGE_SIZE);
 998
 999                 sg->entry[i].data = cpu_to_be64(data);
1000                 sg->entry[i].length = cpu_to_be64(length);
1001                 i++;
1002
1003                 if (i >= SG_ENTRIES_PER_NODE) {
1004                         struct opal_sg_list *next;
1005
1006                         next = kzalloc(PAGE_SIZE, GFP_KERNEL);
1007                         if (!next)
1008                                 goto nomem;
1009
1010                         sg->length = cpu_to_be64(
1011                                         i * sizeof(struct opal_sg_entry) + 16);
1012                         i = 0;
1013                         sg->next = cpu_to_be64(__pa(next));
1014                         sg = next;
1015                 }
1016
1017                 vmalloc_addr += length;
1018                 vmalloc_size -= length;
1019         }
1020
1021         sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
1022
1023         return first;
1024
1025 nomem:
1026         pr_err("%s : Failed to allocate memory\n", __func__);
1027         opal_free_sg_list(first);
1028         return NULL;
1029 }
1030
1031 void opal_free_sg_list(struct opal_sg_list *sg)
1032 {
1033         while (sg) {
1034                 uint64_t next = be64_to_cpu(sg->next);
1035
1036                 kfree(sg);
1037
1038                 if (next)
1039                         sg = __va(next);
1040                 else
1041                         sg = NULL;
1042         }
1043 }
1044
1045 int opal_error_code(int rc)
1046 {
1047         switch (rc) {
1048         case OPAL_SUCCESS:              return 0;
1049
1050         case OPAL_PARAMETER:            return -EINVAL;
1051         case OPAL_ASYNC_COMPLETION:     return -EINPROGRESS;
1052         case OPAL_BUSY:
1053         case OPAL_BUSY_EVENT:           return -EBUSY;
1054         case OPAL_NO_MEM:               return -ENOMEM;
1055         case OPAL_PERMISSION:           return -EPERM;
1056
1057         case OPAL_UNSUPPORTED:          return -EIO;
1058         case OPAL_HARDWARE:             return -EIO;
1059         case OPAL_INTERNAL_ERROR:       return -EIO;
1060         case OPAL_TIMEOUT:              return -ETIMEDOUT;
1061         default:
1062                 pr_err("%s: unexpected OPAL error %d\n", __func__, rc);
1063                 return -EIO;
1064         }
1065 }
1066
1067 void powernv_set_nmmu_ptcr(unsigned long ptcr)
1068 {
1069         int rc;
1070
1071         if (firmware_has_feature(FW_FEATURE_OPAL)) {
1072                 rc = opal_nmmu_set_ptcr(-1UL, ptcr);
1073                 if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED)
1074                         pr_warn("%s: Unable to set nest mmu ptcr\n", __func__);
1075         }
1076 }
1077
1078 EXPORT_SYMBOL_GPL(opal_poll_events);
1079 EXPORT_SYMBOL_GPL(opal_rtc_read);
1080 EXPORT_SYMBOL_GPL(opal_rtc_write);
1081 EXPORT_SYMBOL_GPL(opal_tpo_read);
1082 EXPORT_SYMBOL_GPL(opal_tpo_write);
1083 EXPORT_SYMBOL_GPL(opal_i2c_request);
1084 /* Export these symbols for PowerNV LED class driver */
1085 EXPORT_SYMBOL_GPL(opal_leds_get_ind);
1086 EXPORT_SYMBOL_GPL(opal_leds_set_ind);
1087 /* Export this symbol for PowerNV Operator Panel class driver */
1088 EXPORT_SYMBOL_GPL(opal_write_oppanel_async);
1089 /* Export this for KVM */
1090 EXPORT_SYMBOL_GPL(opal_int_set_mfrr);
1091 EXPORT_SYMBOL_GPL(opal_int_eoi);
1092 EXPORT_SYMBOL_GPL(opal_error_code);