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/interrupt.h>
  20 #include <linux/notifier.h>
  21 #include <linux/slab.h>
  22 #include <linux/sched.h>
  23 #include <linux/kobject.h>
  24 #include <linux/delay.h>
  25 #include <linux/memblock.h>
  26 #include <linux/kthread.h>
  27 #include <linux/freezer.h>
  28
  29 #include <asm/machdep.h>
  30 #include <asm/opal.h>
  31 #include <asm/firmware.h>
  32 #include <asm/mce.h>
  33
  34 #include "powernv.h"
  35
  36 /* /sys/firmware/opal */
  37 struct kobject *opal_kobj;
  38
  39 struct opal {
  40         u64 base;
  41         u64 entry;
  42         u64 size;
  43 } opal;
  44
  45 struct mcheck_recoverable_range {
  46         u64 start_addr;
  47         u64 end_addr;
  48         u64 recover_addr;
  49 };
  50
  51 static struct mcheck_recoverable_range *mc_recoverable_range;
  52 static int mc_recoverable_range_len;
  53
  54 struct device_node *opal_node;
  55 static DEFINE_SPINLOCK(opal_write_lock);
  56 static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
  57 static uint32_t opal_heartbeat;
  58 static struct task_struct *kopald_tsk;
  59
  60 void opal_configure_cores(void)
  61 {
  62         u64 reinit_flags = 0;
  63
  64         /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
  65          *
  66          * It will preserve non volatile GPRs and HSPRG0/1. It will
  67          * also restore HIDs and other SPRs to their original value
  68          * but it might clobber a bunch.
  69          */
  70 #ifdef __BIG_ENDIAN__
  71         reinit_flags |= OPAL_REINIT_CPUS_HILE_BE;
  72 #else
  73         reinit_flags |= OPAL_REINIT_CPUS_HILE_LE;
  74 #endif
  75
  76         /*
  77          * POWER9 always support running hash:
  78          *  ie. Host hash  supports  hash guests
  79          *      Host radix supports  hash/radix guests
  80          */
  81         if (early_cpu_has_feature(CPU_FTR_ARCH_300)) {
  82                 reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH;
  83                 if (early_radix_enabled())
  84                         reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX;
  85         }
  86
  87         opal_reinit_cpus(reinit_flags);
  88
  89         /* Restore some bits */
  90         if (cur_cpu_spec->cpu_restore)
  91                 cur_cpu_spec->cpu_restore();
  92 }
  93
  94 int __init early_init_dt_scan_opal(unsigned long node,
  95                                    const char *uname, int depth, void *data)
  96 {
  97         const void *basep, *entryp, *sizep;
  98         int basesz, entrysz, runtimesz;
  99
 100         if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
 101                 return 0;
 102
 103         basep  = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
 104         entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
 105         sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);
 106
 107         if (!basep || !entryp || !sizep)
 108                 return 1;
 109
 110         opal.base = of_read_number(basep, basesz/4);
 111         opal.entry = of_read_number(entryp, entrysz/4);
 112         opal.size = of_read_number(sizep, runtimesz/4);
 113
 114         pr_debug("OPAL Base  = 0x%llx (basep=%p basesz=%d)\n",
 115                  opal.base, basep, basesz);
 116         pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
 117                  opal.entry, entryp, entrysz);
 118         pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
 119                  opal.size, sizep, runtimesz);
 120
 121         if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
 122                 powerpc_firmware_features |= FW_FEATURE_OPAL;
 123                 pr_info("OPAL detected !\n");
 124         } else {
 125                 panic("OPAL != V3 detected, no longer supported.\n");
 126         }
 127
 128         return 1;
 129 }
 130
 131 int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
 132                                    const char *uname, int depth, void *data)
 133 {
 134         int i, psize, size;
 135         const __be32 *prop;
 136
 137         if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
 138                 return 0;
 139
 140         prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);
 141
 142         if (!prop)
 143                 return 1;
 144
 145         pr_debug("Found machine check recoverable ranges.\n");
 146
 147         /*
 148          * Calculate number of available entries.
 149          *
 150          * Each recoverable address range entry is (start address, len,
 151          * recovery address), 2 cells each for start and recovery address,
 152          * 1 cell for len, totalling 5 cells per entry.
 153          */
 154         mc_recoverable_range_len = psize / (sizeof(*prop) * 5);
 155
 156         /* Sanity check */
 157         if (!mc_recoverable_range_len)
 158                 return 1;
 159
 160         /* Size required to hold all the entries. */
 161         size = mc_recoverable_range_len *
 162                         sizeof(struct mcheck_recoverable_range);
 163
 164         /*
 165          * Allocate a buffer to hold the MC recoverable ranges. We would be
 166          * accessing them in real mode, hence it needs to be within
 167          * RMO region.
 168          */
 169         mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64),
 170                                                         ppc64_rma_size));
 171         memset(mc_recoverable_range, 0, size);
 172
 173         for (i = 0; i < mc_recoverable_range_len; i++) {
 174                 mc_recoverable_range[i].start_addr =
 175                                         of_read_number(prop + (i * 5) + 0, 2);
 176                 mc_recoverable_range[i].end_addr =
 177                                         mc_recoverable_range[i].start_addr +
 178                                         of_read_number(prop + (i * 5) + 2, 1);
 179                 mc_recoverable_range[i].recover_addr =
 180                                         of_read_number(prop + (i * 5) + 3, 2);
 181
 182                 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
 183                                 mc_recoverable_range[i].start_addr,
 184                                 mc_recoverable_range[i].end_addr,
 185                                 mc_recoverable_range[i].recover_addr);
 186         }
 187         return 1;
 188 }
 189
 190 static int __init opal_register_exception_handlers(void)
 191 {
 192 #ifdef __BIG_ENDIAN__
 193         u64 glue;
 194
 195         if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
 196                 return -ENODEV;
 197
 198         /* Hookup some exception handlers except machine check. We use the
 199          * fwnmi area at 0x7000 to provide the glue space to OPAL
 200          */
 201         glue = 0x7000;
 202
 203         /*
 204          * Check if we are running on newer firmware that exports
 205          * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
 206          * the HMI interrupt and we catch it directly in Linux.
 207          *
 208          * For older firmware (i.e currently released POWER8 System Firmware
 209          * as of today <= SV810_087), we fallback to old behavior and let OPAL
 210          * patch the HMI vector and handle it inside OPAL firmware.
 211          *
 212          * For newer firmware (in development/yet to be released) we will
 213          * start catching/handling HMI directly in Linux.
 214          */
 215         if (!opal_check_token(OPAL_HANDLE_HMI)) {
 216                 pr_info("Old firmware detected, OPAL handles HMIs.\n");
 217                 opal_register_exception_handler(
 218                                 OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
 219                                 0, glue);
 220                 glue += 128;
 221         }
 222
 223         opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
 224 #endif
 225
 226         return 0;
 227 }
 228 machine_early_initcall(powernv, opal_register_exception_handlers);
 229
 230 /*
 231  * Opal message notifier based on message type. Allow subscribers to get
 232  * notified for specific messgae type.
 233  */
 234 int opal_message_notifier_register(enum opal_msg_type msg_type,
 235                                         struct notifier_block *nb)
 236 {
 237         if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) {
 238                 pr_warning("%s: Invalid arguments, msg_type:%d\n",
 239                            __func__, msg_type);
 240                 return -EINVAL;
 241         }
 242
 243         return atomic_notifier_chain_register(
 244                                 &opal_msg_notifier_head[msg_type], nb);
 245 }
 246 EXPORT_SYMBOL_GPL(opal_message_notifier_register);
 247
 248 int opal_message_notifier_unregister(enum opal_msg_type msg_type,
 249                                      struct notifier_block *nb)
 250 {
 251         return atomic_notifier_chain_unregister(
 252                         &opal_msg_notifier_head[msg_type], nb);
 253 }
 254 EXPORT_SYMBOL_GPL(opal_message_notifier_unregister);
 255
 256 static void opal_message_do_notify(uint32_t msg_type, void *msg)
 257 {
 258         /* notify subscribers */
 259         atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type],
 260                                         msg_type, msg);
 261 }
 262
 263 static void opal_handle_message(void)
 264 {
 265         s64 ret;
 266         /*
 267          * TODO: pre-allocate a message buffer depending on opal-msg-size
 268          * value in /proc/device-tree.
 269          */
 270         static struct opal_msg msg;
 271         u32 type;
 272
 273         ret = opal_get_msg(__pa(&msg), sizeof(msg));
 274         /* No opal message pending. */
 275         if (ret == OPAL_RESOURCE)
 276                 return;
 277
 278         /* check for errors. */
 279         if (ret) {
 280                 pr_warning("%s: Failed to retrieve opal message, err=%lld\n",
 281                                 __func__, ret);
 282                 return;
 283         }
 284
 285         type = be32_to_cpu(msg.msg_type);
 286
 287         /* Sanity check */
 288         if (type >= OPAL_MSG_TYPE_MAX) {
 289                 pr_warn_once("%s: Unknown message type: %u\n", __func__, type);
 290                 return;
 291         }
 292         opal_message_do_notify(type, (void *)&msg);
 293 }
 294
 295 static irqreturn_t opal_message_notify(int irq, void *data)
 296 {
 297         opal_handle_message();
 298         return IRQ_HANDLED;
 299 }
 300
 301 static int __init opal_message_init(void)
 302 {
 303         int ret, i, irq;
 304
 305         for (i = 0; i < OPAL_MSG_TYPE_MAX; i++)
 306                 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]);
 307
 308         irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING));
 309         if (!irq) {
 310                 pr_err("%s: Can't register OPAL event irq (%d)\n",
 311                        __func__, irq);
 312                 return irq;
 313         }
 314
 315         ret = request_irq(irq, opal_message_notify,
 316                         IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL);
 317         if (ret) {
 318                 pr_err("%s: Can't request OPAL event irq (%d)\n",
 319                        __func__, ret);
 320                 return ret;
 321         }
 322
 323         return 0;
 324 }
 325
 326 int opal_get_chars(uint32_t vtermno, char *buf, int count)
 327 {
 328         s64 rc;
 329         __be64 evt, len;
 330
 331         if (!opal.entry)
 332                 return -ENODEV;
 333         opal_poll_events(&evt);
 334         if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
 335                 return 0;
 336         len = cpu_to_be64(count);
 337         rc = opal_console_read(vtermno, &len, buf);
 338         if (rc == OPAL_SUCCESS)
 339                 return be64_to_cpu(len);
 340         return 0;
 341 }
 342
 343 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
 344 {
 345         int written = 0;
 346         __be64 olen;
 347         s64 len, rc;
 348         unsigned long flags;
 349         __be64 evt;
 350
 351         if (!opal.entry)
 352                 return -ENODEV;
 353
 354         /* We want put_chars to be atomic to avoid mangling of hvsi
 355          * packets. To do that, we first test for room and return
 356          * -EAGAIN if there isn't enough.
 357          *
 358          * Unfortunately, opal_console_write_buffer_space() doesn't
 359          * appear to work on opal v1, so we just assume there is
 360          * enough room and be done with it
 361          */
 362         spin_lock_irqsave(&opal_write_lock, flags);
 363         rc = opal_console_write_buffer_space(vtermno, &olen);
 364         len = be64_to_cpu(olen);
 365         if (rc || len < total_len) {
 366                 spin_unlock_irqrestore(&opal_write_lock, flags);
 367                 /* Closed -> drop characters */
 368                 if (rc)
 369                         return total_len;
 370                 opal_poll_events(NULL);
 371                 return -EAGAIN;
 372         }
 373
 374         /* We still try to handle partial completions, though they
 375          * should no longer happen.
 376          */
 377         rc = OPAL_BUSY;
 378         while(total_len > 0 && (rc == OPAL_BUSY ||
 379                                 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
 380                 olen = cpu_to_be64(total_len);
 381                 rc = opal_console_write(vtermno, &olen, data);
 382                 len = be64_to_cpu(olen);
 383
 384                 /* Closed or other error drop */
 385                 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
 386                     rc != OPAL_BUSY_EVENT) {
 387                         written = total_len;
 388                         break;
 389                 }
 390                 if (rc == OPAL_SUCCESS) {
 391                         total_len -= len;
 392                         data += len;
 393                         written += len;
 394                 }
 395                 /* This is a bit nasty but we need that for the console to
 396                  * flush when there aren't any interrupts. We will clean
 397                  * things a bit later to limit that to synchronous path
 398                  * such as the kernel console and xmon/udbg
 399                  */
 400                 do
 401                         opal_poll_events(&evt);
 402                 while(rc == OPAL_SUCCESS &&
 403                         (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT));
 404         }
 405         spin_unlock_irqrestore(&opal_write_lock, flags);
 406         return written;
 407 }
 408
 409 static int opal_recover_mce(struct pt_regs *regs,
 410                                         struct machine_check_event *evt)
 411 {
 412         int recovered = 0;
 413
 414         if (!(regs->msr & MSR_RI)) {
 415                 /* If MSR_RI isn't set, we cannot recover */
 416                 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
 417                 recovered = 0;
 418         } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
 419                 /* Platform corrected itself */
 420                 recovered = 1;
 421         } else if (evt->severity == MCE_SEV_FATAL) {
 422                 /* Fatal machine check */
 423                 pr_err("Machine check interrupt is fatal\n");
 424                 recovered = 0;
 425         } else if ((evt->severity == MCE_SEV_ERROR_SYNC) &&
 426                         (user_mode(regs) && !is_global_init(current))) {
 427                 /*
 428                  * For now, kill the task if we have received exception when
 429                  * in userspace.
 430                  *
 431                  * TODO: Queue up this address for hwpoisioning later.
 432                  */
 433                 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
 434                 recovered = 1;
 435         }
 436         return recovered;
 437 }
 438
 439 int opal_machine_check(struct pt_regs *regs)
 440 {
 441         struct machine_check_event evt;
 442         int ret;
 443
 444         if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
 445                 return 0;
 446
 447         /* Print things out */
 448         if (evt.version != MCE_V1) {
 449                 pr_err("Machine Check Exception, Unknown event version %d !\n",
 450                        evt.version);
 451                 return 0;
 452         }
 453         machine_check_print_event_info(&evt, user_mode(regs));
 454
 455         if (opal_recover_mce(regs, &evt))
 456                 return 1;
 457
 458         /*
 459          * Unrecovered machine check, we are heading to panic path.
 460          *
 461          * We may have hit this MCE in very early stage of kernel
 462          * initialization even before opal-prd has started running. If
 463          * this is the case then this MCE error may go un-noticed or
 464          * un-analyzed if we go down panic path. We need to inform
 465          * BMC/OCC about this error so that they can collect relevant
 466          * data for error analysis before rebooting.
 467          * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so.
 468          * This function may not return on BMC based system.
 469          */
 470         ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR,
 471                         "Unrecoverable Machine Check exception");
 472         if (ret == OPAL_UNSUPPORTED) {
 473                 pr_emerg("Reboot type %d not supported\n",
 474                                         OPAL_REBOOT_PLATFORM_ERROR);
 475         }
 476
 477         /*
 478          * We reached here. There can be three possibilities:
 479          * 1. We are running on a firmware level that do not support
 480          *    opal_cec_reboot2()
 481          * 2. We are running on a firmware level that do not support
 482          *    OPAL_REBOOT_PLATFORM_ERROR reboot type.
 483          * 3. We are running on FSP based system that does not need opal
 484          *    to trigger checkstop explicitly for error analysis. The FSP
 485          *    PRD component would have already got notified about this
 486          *    error through other channels.
 487          *
 488          * If hardware marked this as an unrecoverable MCE, we are
 489          * going to panic anyway. Even if it didn't, it's not safe to
 490          * continue at this point, so we should explicitly panic.
 491          */
 492
 493         panic("PowerNV Unrecovered Machine Check");
 494         return 0;
 495 }
 496
 497 /* Early hmi handler called in real mode. */
 498 int opal_hmi_exception_early(struct pt_regs *regs)
 499 {
 500         s64 rc;
 501
 502         /*
 503          * call opal hmi handler. Pass paca address as token.
 504          * The return value OPAL_SUCCESS is an indication that there is
 505          * an HMI event generated waiting to pull by Linux.
 506          */
 507         rc = opal_handle_hmi();
 508         if (rc == OPAL_SUCCESS) {
 509                 local_paca->hmi_event_available = 1;
 510                 return 1;
 511         }
 512         return 0;
 513 }
 514
 515 /* HMI exception handler called in virtual mode during check_irq_replay. */
 516 int opal_handle_hmi_exception(struct pt_regs *regs)
 517 {
 518         s64 rc;
 519         __be64 evt = 0;
 520
 521         /*
 522          * Check if HMI event is available.
 523          * if Yes, then call opal_poll_events to pull opal messages and
 524          * process them.
 525          */
 526         if (!local_paca->hmi_event_available)
 527                 return 0;
 528
 529         local_paca->hmi_event_available = 0;
 530         rc = opal_poll_events(&evt);
 531         if (rc == OPAL_SUCCESS && evt)
 532                 opal_handle_events(be64_to_cpu(evt));
 533
 534         return 1;
 535 }
 536
 537 static uint64_t find_recovery_address(uint64_t nip)
 538 {
 539         int i;
 540
 541         for (i = 0; i < mc_recoverable_range_len; i++)
 542                 if ((nip >= mc_recoverable_range[i].start_addr) &&
 543                     (nip < mc_recoverable_range[i].end_addr))
 544                     return mc_recoverable_range[i].recover_addr;
 545         return 0;
 546 }
 547
 548 bool opal_mce_check_early_recovery(struct pt_regs *regs)
 549 {
 550         uint64_t recover_addr = 0;
 551
 552         if (!opal.base || !opal.size)
 553                 goto out;
 554
 555         if ((regs->nip >= opal.base) &&
 556                         (regs->nip < (opal.base + opal.size)))
 557                 recover_addr = find_recovery_address(regs->nip);
 558
 559         /*
 560          * Setup regs->nip to rfi into fixup address.
 561          */
 562         if (recover_addr)
 563                 regs->nip = recover_addr;
 564
 565 out:
 566         return !!recover_addr;
 567 }
 568
 569 static int opal_sysfs_init(void)
 570 {
 571         opal_kobj = kobject_create_and_add("opal", firmware_kobj);
 572         if (!opal_kobj) {
 573                 pr_warn("kobject_create_and_add opal failed\n");
 574                 return -ENOMEM;
 575         }
 576
 577         return 0;
 578 }
 579
 580 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
 581                                struct bin_attribute *bin_attr,
 582                                char *buf, loff_t off, size_t count)
 583 {
 584         return memory_read_from_buffer(buf, count, &off, bin_attr->private,
 585                                        bin_attr->size);
 586 }
 587
 588 static BIN_ATTR_RO(symbol_map, 0);
 589
 590 static void opal_export_symmap(void)
 591 {
 592         const __be64 *syms;
 593         unsigned int size;
 594         struct device_node *fw;
 595         int rc;
 596
 597         fw = of_find_node_by_path("/ibm,opal/firmware");
 598         if (!fw)
 599                 return;
 600         syms = of_get_property(fw, "symbol-map", &size);
 601         if (!syms || size != 2 * sizeof(__be64))
 602                 return;
 603
 604         /* Setup attributes */
 605         bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0]));
 606         bin_attr_symbol_map.size = be64_to_cpu(syms[1]);
 607
 608         rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map);
 609         if (rc)
 610                 pr_warn("Error %d creating OPAL symbols file\n", rc);
 611 }
 612
 613 static ssize_t export_attr_read(struct file *fp, struct kobject *kobj,
 614                                 struct bin_attribute *bin_attr, char *buf,
 615                                 loff_t off, size_t count)
 616 {
 617         return memory_read_from_buffer(buf, count, &off, bin_attr->private,
 618                                        bin_attr->size);
 619 }
 620
 621 /*
 622  * opal_export_attrs: creates a sysfs node for each property listed in
 623  * the device-tree under /ibm,opal/firmware/exports/
 624  * All new sysfs nodes are created under /opal/exports/.
 625  * This allows for reserved memory regions (e.g. HDAT) to be read.
 626  * The new sysfs nodes are only readable by root.
 627  */
 628 static void opal_export_attrs(void)
 629 {
 630         struct bin_attribute *attr;
 631         struct device_node *np;
 632         struct property *prop;
 633         struct kobject *kobj;
 634         u64 vals[2];
 635         int rc;
 636
 637         np = of_find_node_by_path("/ibm,opal/firmware/exports");
 638         if (!np)
 639                 return;
 640
 641         /* Create new 'exports' directory - /sys/firmware/opal/exports */
 642         kobj = kobject_create_and_add("exports", opal_kobj);
 643         if (!kobj) {
 644                 pr_warn("kobject_create_and_add() of exports failed\n");
 645                 return;
 646         }
 647
 648         for_each_property_of_node(np, prop) {
 649                 if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle"))
 650                         continue;
 651
 652                 if (of_property_read_u64_array(np, prop->name, &vals[0], 2))
 653                         continue;
 654
 655                 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
 656
 657                 if (attr == NULL) {
 658                         pr_warn("Failed kmalloc for bin_attribute!");
 659                         continue;
 660                 }
 661
 662                 sysfs_bin_attr_init(attr);
 663                 attr->attr.name = kstrdup(prop->name, GFP_KERNEL);
 664                 attr->attr.mode = 0400;
 665                 attr->read = export_attr_read;
 666                 attr->private = __va(vals[0]);
 667                 attr->size = vals[1];
 668
 669                 if (attr->attr.name == NULL) {
 670                         pr_warn("Failed kstrdup for bin_attribute attr.name");
 671                         kfree(attr);
 672                         continue;
 673                 }
 674
 675                 rc = sysfs_create_bin_file(kobj, attr);
 676                 if (rc) {
 677                         pr_warn("Error %d creating OPAL sysfs exports/%s file\n",
 678                                  rc, prop->name);
 679                         kfree(attr->attr.name);
 680                         kfree(attr);
 681                 }
 682         }
 683
 684         of_node_put(np);
 685 }
 686
 687 static void __init opal_dump_region_init(void)
 688 {
 689         void *addr;
 690         uint64_t size;
 691         int rc;
 692
 693         if (!opal_check_token(OPAL_REGISTER_DUMP_REGION))
 694                 return;
 695
 696         /* Register kernel log buffer */
 697         addr = log_buf_addr_get();
 698         if (addr == NULL)
 699                 return;
 700
 701         size = log_buf_len_get();
 702         if (size == 0)
 703                 return;
 704
 705         rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
 706                                        __pa(addr), size);
 707         /* Don't warn if this is just an older OPAL that doesn't
 708          * know about that call
 709          */
 710         if (rc && rc != OPAL_UNSUPPORTED)
 711                 pr_warn("DUMP: Failed to register kernel log buffer. "
 712                         "rc = %d\n", rc);
 713 }
 714
 715 static void opal_pdev_init(const char *compatible)
 716 {
 717         struct device_node *np;
 718
 719         for_each_compatible_node(np, NULL, compatible)
 720                 of_platform_device_create(np, NULL, NULL);
 721 }
 722
 723 static int kopald(void *unused)
 724 {
 725         unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1;
 726         __be64 events;
 727
 728         set_freezable();
 729         do {
 730                 try_to_freeze();
 731                 opal_poll_events(&events);
 732                 opal_handle_events(be64_to_cpu(events));
 733                 schedule_timeout_interruptible(timeout);
 734         } while (!kthread_should_stop());
 735
 736         return 0;
 737 }
 738
 739 void opal_wake_poller(void)
 740 {
 741         if (kopald_tsk)
 742                 wake_up_process(kopald_tsk);
 743 }
 744
 745 static void opal_init_heartbeat(void)
 746 {
 747         /* Old firwmware, we assume the HVC heartbeat is sufficient */
 748         if (of_property_read_u32(opal_node, "ibm,heartbeat-ms",
 749                                  &opal_heartbeat) != 0)
 750                 opal_heartbeat = 0;
 751
 752         if (opal_heartbeat)
 753                 kopald_tsk = kthread_run(kopald, NULL, "kopald");
 754 }
 755
 756 static int __init opal_init(void)
 757 {
 758         struct device_node *np, *consoles, *leds;
 759         int rc;
 760
 761         opal_node = of_find_node_by_path("/ibm,opal");
 762         if (!opal_node) {
 763                 pr_warn("Device node not found\n");
 764                 return -ENODEV;
 765         }
 766
 767         /* Register OPAL consoles if any ports */
 768         consoles = of_find_node_by_path("/ibm,opal/consoles");
 769         if (consoles) {
 770                 for_each_child_of_node(consoles, np) {
 771                         if (strcmp(np->name, "serial"))
 772                                 continue;
 773                         of_platform_device_create(np, NULL, NULL);
 774                 }
 775                 of_node_put(consoles);
 776         }
 777
 778         /* Initialise OPAL messaging system */
 779         opal_message_init();
 780
 781         /* Initialise OPAL asynchronous completion interface */
 782         opal_async_comp_init();
 783
 784         /* Initialise OPAL sensor interface */
 785         opal_sensor_init();
 786
 787         /* Initialise OPAL hypervisor maintainence interrupt handling */
 788         opal_hmi_handler_init();
 789
 790         /* Create i2c platform devices */
 791         opal_pdev_init("ibm,opal-i2c");
 792
 793         /* Setup a heatbeat thread if requested by OPAL */
 794         opal_init_heartbeat();
 795
 796         /* Create leds platform devices */
 797         leds = of_find_node_by_path("/ibm,opal/leds");
 798         if (leds) {
 799                 of_platform_device_create(leds, "opal_leds", NULL);
 800                 of_node_put(leds);
 801         }
 802
 803         /* Initialise OPAL message log interface */
 804         opal_msglog_init();
 805
 806         /* Create "opal" kobject under /sys/firmware */
 807         rc = opal_sysfs_init();
 808         if (rc == 0) {
 809                 /* Export symbol map to userspace */
 810                 opal_export_symmap();
 811                 /* Setup dump region interface */
 812                 opal_dump_region_init();
 813                 /* Setup error log interface */
 814                 rc = opal_elog_init();
 815                 /* Setup code update interface */
 816                 opal_flash_update_init();
 817                 /* Setup platform dump extract interface */
 818                 opal_platform_dump_init();
 819                 /* Setup system parameters interface */
 820                 opal_sys_param_init();
 821                 /* Setup message log sysfs interface. */
 822                 opal_msglog_sysfs_init();
 823         }
 824
 825         /* Export all properties */
 826         opal_export_attrs();
 827
 828         /* Initialize platform devices: IPMI backend, PRD & flash interface */
 829         opal_pdev_init("ibm,opal-ipmi");
 830         opal_pdev_init("ibm,opal-flash");
 831         opal_pdev_init("ibm,opal-prd");
 832
 833         /* Initialise platform device: oppanel interface */
 834         opal_pdev_init("ibm,opal-oppanel");
 835
 836         /* Initialise OPAL kmsg dumper for flushing console on panic */
 837         opal_kmsg_init();
 838
 839         return 0;
 840 }
 841 machine_subsys_initcall(powernv, opal_init);
 842
 843 void opal_shutdown(void)
 844 {
 845         long rc = OPAL_BUSY;
 846
 847         opal_event_shutdown();
 848
 849         /*
 850          * Then sync with OPAL which ensure anything that can
 851          * potentially write to our memory has completed such
 852          * as an ongoing dump retrieval
 853          */
 854         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 855                 rc = opal_sync_host_reboot();
 856                 if (rc == OPAL_BUSY)
 857                         opal_poll_events(NULL);
 858                 else
 859                         mdelay(10);
 860         }
 861
 862         /* Unregister memory dump region */
 863         if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION))
 864                 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
 865 }
 866
 867 /* Export this so that test modules can use it */
 868 EXPORT_SYMBOL_GPL(opal_invalid_call);
 869 EXPORT_SYMBOL_GPL(opal_xscom_read);
 870 EXPORT_SYMBOL_GPL(opal_xscom_write);
 871 EXPORT_SYMBOL_GPL(opal_ipmi_send);
 872 EXPORT_SYMBOL_GPL(opal_ipmi_recv);
 873 EXPORT_SYMBOL_GPL(opal_flash_read);
 874 EXPORT_SYMBOL_GPL(opal_flash_write);
 875 EXPORT_SYMBOL_GPL(opal_flash_erase);
 876 EXPORT_SYMBOL_GPL(opal_prd_msg);
 877
 878 /* Convert a region of vmalloc memory to an opal sg list */
 879 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
 880                                              unsigned long vmalloc_size)
 881 {
 882         struct opal_sg_list *sg, *first = NULL;
 883         unsigned long i = 0;
 884
 885         sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
 886         if (!sg)
 887                 goto nomem;
 888
 889         first = sg;
 890
 891         while (vmalloc_size > 0) {
 892                 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
 893                 uint64_t length = min(vmalloc_size, PAGE_SIZE);
 894
 895                 sg->entry[i].data = cpu_to_be64(data);
 896                 sg->entry[i].length = cpu_to_be64(length);
 897                 i++;
 898
 899                 if (i >= SG_ENTRIES_PER_NODE) {
 900                         struct opal_sg_list *next;
 901
 902                         next = kzalloc(PAGE_SIZE, GFP_KERNEL);
 903                         if (!next)
 904                                 goto nomem;
 905
 906                         sg->length = cpu_to_be64(
 907                                         i * sizeof(struct opal_sg_entry) + 16);
 908                         i = 0;
 909                         sg->next = cpu_to_be64(__pa(next));
 910                         sg = next;
 911                 }
 912
 913                 vmalloc_addr += length;
 914                 vmalloc_size -= length;
 915         }
 916
 917         sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
 918
 919         return first;
 920
 921 nomem:
 922         pr_err("%s : Failed to allocate memory\n", __func__);
 923         opal_free_sg_list(first);
 924         return NULL;
 925 }
 926
 927 void opal_free_sg_list(struct opal_sg_list *sg)
 928 {
 929         while (sg) {
 930                 uint64_t next = be64_to_cpu(sg->next);
 931
 932                 kfree(sg);
 933
 934                 if (next)
 935                         sg = __va(next);
 936                 else
 937                         sg = NULL;
 938         }
 939 }
 940
 941 int opal_error_code(int rc)
 942 {
 943         switch (rc) {
 944         case OPAL_SUCCESS:              return 0;
 945
 946         case OPAL_PARAMETER:            return -EINVAL;
 947         case OPAL_ASYNC_COMPLETION:     return -EINPROGRESS;
 948         case OPAL_BUSY_EVENT:           return -EBUSY;
 949         case OPAL_NO_MEM:               return -ENOMEM;
 950         case OPAL_PERMISSION:           return -EPERM;
 951
 952         case OPAL_UNSUPPORTED:          return -EIO;
 953         case OPAL_HARDWARE:             return -EIO;
 954         case OPAL_INTERNAL_ERROR:       return -EIO;
 955         default:
 956                 pr_err("%s: unexpected OPAL error %d\n", __func__, rc);
 957                 return -EIO;
 958         }
 959 }
 960
 961 void powernv_set_nmmu_ptcr(unsigned long ptcr)
 962 {
 963         int rc;
 964
 965         if (firmware_has_feature(FW_FEATURE_OPAL)) {
 966                 rc = opal_nmmu_set_ptcr(-1UL, ptcr);
 967                 if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED)
 968                         pr_warn("%s: Unable to set nest mmu ptcr\n", __func__);
 969         }
 970 }
 971
 972 EXPORT_SYMBOL_GPL(opal_poll_events);
 973 EXPORT_SYMBOL_GPL(opal_rtc_read);
 974 EXPORT_SYMBOL_GPL(opal_rtc_write);
 975 EXPORT_SYMBOL_GPL(opal_tpo_read);
 976 EXPORT_SYMBOL_GPL(opal_tpo_write);
 977 EXPORT_SYMBOL_GPL(opal_i2c_request);
 978 /* Export these symbols for PowerNV LED class driver */
 979 EXPORT_SYMBOL_GPL(opal_leds_get_ind);
 980 EXPORT_SYMBOL_GPL(opal_leds_set_ind);
 981 /* Export this symbol for PowerNV Operator Panel class driver */
 982 EXPORT_SYMBOL_GPL(opal_write_oppanel_async);
 983 /* Export this for KVM */
 984 EXPORT_SYMBOL_GPL(opal_int_set_mfrr);
 985 EXPORT_SYMBOL_GPL(opal_int_eoi);