arch/powerpc/platforms/powernv/eeh-powernv.c

   1 /*
   2  * The file intends to implement the platform dependent EEH operations on
   3  * powernv platform. Actually, the powernv was created in order to fully
   4  * hypervisor support.
   5  *
   6  * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2013.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/atomic.h>
  15 #include <linux/debugfs.h>
  16 #include <linux/delay.h>
  17 #include <linux/export.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/list.h>
  21 #include <linux/msi.h>
  22 #include <linux/of.h>
  23 #include <linux/pci.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/rbtree.h>
  26 #include <linux/sched.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/spinlock.h>
  29
  30 #include <asm/eeh.h>
  31 #include <asm/eeh_event.h>
  32 #include <asm/firmware.h>
  33 #include <asm/io.h>
  34 #include <asm/iommu.h>
  35 #include <asm/machdep.h>
  36 #include <asm/msi_bitmap.h>
  37 #include <asm/opal.h>
  38 #include <asm/ppc-pci.h>
  39 #include <asm/pnv-pci.h>
  40
  41 #include "powernv.h"
  42 #include "pci.h"
  43
  44 static bool pnv_eeh_nb_init = false;
  45 static int eeh_event_irq = -EINVAL;
  46
  47 static int pnv_eeh_init(void)
  48 {
  49         struct pci_controller *hose;
  50         struct pnv_phb *phb;
  51
  52         if (!firmware_has_feature(FW_FEATURE_OPAL)) {
  53                 pr_warn("%s: OPAL is required !\n",
  54                         __func__);
  55                 return -EINVAL;
  56         }
  57
  58         /* Set probe mode */
  59         eeh_add_flag(EEH_PROBE_MODE_DEV);
  60
  61         /*
  62          * P7IOC blocks PCI config access to frozen PE, but PHB3
  63          * doesn't do that. So we have to selectively enable I/O
  64          * prior to collecting error log.
  65          */
  66         list_for_each_entry(hose, &hose_list, list_node) {
  67                 phb = hose->private_data;
  68
  69                 if (phb->model == PNV_PHB_MODEL_P7IOC)
  70                         eeh_add_flag(EEH_ENABLE_IO_FOR_LOG);
  71
  72                 /*
  73                  * PE#0 should be regarded as valid by EEH core
  74                  * if it's not the reserved one. Currently, we
  75                  * have the reserved PE#255 and PE#127 for PHB3
  76                  * and P7IOC separately. So we should regard
  77                  * PE#0 as valid for PHB3 and P7IOC.
  78                  */
  79                 if (phb->ioda.reserved_pe_idx != 0)
  80                         eeh_add_flag(EEH_VALID_PE_ZERO);
  81
  82                 break;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static irqreturn_t pnv_eeh_event(int irq, void *data)
  89 {
  90         /*
  91          * We simply send a special EEH event if EEH has been
  92          * enabled. We don't care about EEH events until we've
  93          * finished processing the outstanding ones. Event processing
  94          * gets unmasked in next_error() if EEH is enabled.
  95          */
  96         disable_irq_nosync(irq);
  97
  98         if (eeh_enabled())
  99                 eeh_send_failure_event(NULL);
 100
 101         return IRQ_HANDLED;
 102 }
 103
 104 #ifdef CONFIG_DEBUG_FS
 105 static ssize_t pnv_eeh_ei_write(struct file *filp,
 106                                 const char __user *user_buf,
 107                                 size_t count, loff_t *ppos)
 108 {
 109         struct pci_controller *hose = filp->private_data;
 110         struct eeh_dev *edev;
 111         struct eeh_pe *pe;
 112         int pe_no, type, func;
 113         unsigned long addr, mask;
 114         char buf[50];
 115         int ret;
 116
 117         if (!eeh_ops || !eeh_ops->err_inject)
 118                 return -ENXIO;
 119
 120         /* Copy over argument buffer */
 121         ret = simple_write_to_buffer(buf, sizeof(buf), ppos, user_buf, count);
 122         if (!ret)
 123                 return -EFAULT;
 124
 125         /* Retrieve parameters */
 126         ret = sscanf(buf, "%x:%x:%x:%lx:%lx",
 127                      &pe_no, &type, &func, &addr, &mask);
 128         if (ret != 5)
 129                 return -EINVAL;
 130
 131         /* Retrieve PE */
 132         edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 133         if (!edev)
 134                 return -ENOMEM;
 135         edev->phb = hose;
 136         edev->pe_config_addr = pe_no;
 137         pe = eeh_pe_get(edev);
 138         kfree(edev);
 139         if (!pe)
 140                 return -ENODEV;
 141
 142         /* Do error injection */
 143         ret = eeh_ops->err_inject(pe, type, func, addr, mask);
 144         return ret < 0 ? ret : count;
 145 }
 146
 147 static const struct file_operations pnv_eeh_ei_fops = {
 148         .open   = simple_open,
 149         .llseek = no_llseek,
 150         .write  = pnv_eeh_ei_write,
 151 };
 152
 153 static int pnv_eeh_dbgfs_set(void *data, int offset, u64 val)
 154 {
 155         struct pci_controller *hose = data;
 156         struct pnv_phb *phb = hose->private_data;
 157
 158         out_be64(phb->regs + offset, val);
 159         return 0;
 160 }
 161
 162 static int pnv_eeh_dbgfs_get(void *data, int offset, u64 *val)
 163 {
 164         struct pci_controller *hose = data;
 165         struct pnv_phb *phb = hose->private_data;
 166
 167         *val = in_be64(phb->regs + offset);
 168         return 0;
 169 }
 170
 171 #define PNV_EEH_DBGFS_ENTRY(name, reg)                          \
 172 static int pnv_eeh_dbgfs_set_##name(void *data, u64 val)        \
 173 {                                                               \
 174         return pnv_eeh_dbgfs_set(data, reg, val);               \
 175 }                                                               \
 176                                                                 \
 177 static int pnv_eeh_dbgfs_get_##name(void *data, u64 *val)       \
 178 {                                                               \
 179         return pnv_eeh_dbgfs_get(data, reg, val);               \
 180 }                                                               \
 181                                                                 \
 182 DEFINE_SIMPLE_ATTRIBUTE(pnv_eeh_dbgfs_ops_##name,               \
 183                         pnv_eeh_dbgfs_get_##name,               \
 184                         pnv_eeh_dbgfs_set_##name,               \
 185                         "0x%llx\n")
 186
 187 PNV_EEH_DBGFS_ENTRY(outb, 0xD10);
 188 PNV_EEH_DBGFS_ENTRY(inbA, 0xD90);
 189 PNV_EEH_DBGFS_ENTRY(inbB, 0xE10);
 190
 191 #endif /* CONFIG_DEBUG_FS */
 192
 193 /**
 194  * pnv_eeh_post_init - EEH platform dependent post initialization
 195  *
 196  * EEH platform dependent post initialization on powernv. When
 197  * the function is called, the EEH PEs and devices should have
 198  * been built. If the I/O cache staff has been built, EEH is
 199  * ready to supply service.
 200  */
 201 static int pnv_eeh_post_init(void)
 202 {
 203         struct pci_controller *hose;
 204         struct pnv_phb *phb;
 205         int ret = 0;
 206
 207         /* Register OPAL event notifier */
 208         if (!pnv_eeh_nb_init) {
 209                 eeh_event_irq = opal_event_request(ilog2(OPAL_EVENT_PCI_ERROR));
 210                 if (eeh_event_irq < 0) {
 211                         pr_err("%s: Can't register OPAL event interrupt (%d)\n",
 212                                __func__, eeh_event_irq);
 213                         return eeh_event_irq;
 214                 }
 215
 216                 ret = request_irq(eeh_event_irq, pnv_eeh_event,
 217                                 IRQ_TYPE_LEVEL_HIGH, "opal-eeh", NULL);
 218                 if (ret < 0) {
 219                         irq_dispose_mapping(eeh_event_irq);
 220                         pr_err("%s: Can't request OPAL event interrupt (%d)\n",
 221                                __func__, eeh_event_irq);
 222                         return ret;
 223                 }
 224
 225                 pnv_eeh_nb_init = true;
 226         }
 227
 228         if (!eeh_enabled())
 229                 disable_irq(eeh_event_irq);
 230
 231         list_for_each_entry(hose, &hose_list, list_node) {
 232                 phb = hose->private_data;
 233
 234                 /*
 235                  * If EEH is enabled, we're going to rely on that.
 236                  * Otherwise, we restore to conventional mechanism
 237                  * to clear frozen PE during PCI config access.
 238                  */
 239                 if (eeh_enabled())
 240                         phb->flags |= PNV_PHB_FLAG_EEH;
 241                 else
 242                         phb->flags &= ~PNV_PHB_FLAG_EEH;
 243
 244                 /* Create debugfs entries */
 245 #ifdef CONFIG_DEBUG_FS
 246                 if (phb->has_dbgfs || !phb->dbgfs)
 247                         continue;
 248
 249                 phb->has_dbgfs = 1;
 250                 debugfs_create_file("err_injct", 0200,
 251                                     phb->dbgfs, hose,
 252                                     &pnv_eeh_ei_fops);
 253
 254                 debugfs_create_file("err_injct_outbound", 0600,
 255                                     phb->dbgfs, hose,
 256                                     &pnv_eeh_dbgfs_ops_outb);
 257                 debugfs_create_file("err_injct_inboundA", 0600,
 258                                     phb->dbgfs, hose,
 259                                     &pnv_eeh_dbgfs_ops_inbA);
 260                 debugfs_create_file("err_injct_inboundB", 0600,
 261                                     phb->dbgfs, hose,
 262                                     &pnv_eeh_dbgfs_ops_inbB);
 263 #endif /* CONFIG_DEBUG_FS */
 264         }
 265
 266         return ret;
 267 }
 268
 269 static int pnv_eeh_find_cap(struct pci_dn *pdn, int cap)
 270 {
 271         int pos = PCI_CAPABILITY_LIST;
 272         int cnt = 48;   /* Maximal number of capabilities */
 273         u32 status, id;
 274
 275         if (!pdn)
 276                 return 0;
 277
 278         /* Check if the device supports capabilities */
 279         pnv_pci_cfg_read(pdn, PCI_STATUS, 2, &status);
 280         if (!(status & PCI_STATUS_CAP_LIST))
 281                 return 0;
 282
 283         while (cnt--) {
 284                 pnv_pci_cfg_read(pdn, pos, 1, &pos);
 285                 if (pos < 0x40)
 286                         break;
 287
 288                 pos &= ~3;
 289                 pnv_pci_cfg_read(pdn, pos + PCI_CAP_LIST_ID, 1, &id);
 290                 if (id == 0xff)
 291                         break;
 292
 293                 /* Found */
 294                 if (id == cap)
 295                         return pos;
 296
 297                 /* Next one */
 298                 pos += PCI_CAP_LIST_NEXT;
 299         }
 300
 301         return 0;
 302 }
 303
 304 static int pnv_eeh_find_ecap(struct pci_dn *pdn, int cap)
 305 {
 306         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
 307         u32 header;
 308         int pos = 256, ttl = (4096 - 256) / 8;
 309
 310         if (!edev || !edev->pcie_cap)
 311                 return 0;
 312         if (pnv_pci_cfg_read(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
 313                 return 0;
 314         else if (!header)
 315                 return 0;
 316
 317         while (ttl-- > 0) {
 318                 if (PCI_EXT_CAP_ID(header) == cap && pos)
 319                         return pos;
 320
 321                 pos = PCI_EXT_CAP_NEXT(header);
 322                 if (pos < 256)
 323                         break;
 324
 325                 if (pnv_pci_cfg_read(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
 326                         break;
 327         }
 328
 329         return 0;
 330 }
 331
 332 /**
 333  * pnv_eeh_probe - Do probe on PCI device
 334  * @pdn: PCI device node
 335  * @data: unused
 336  *
 337  * When EEH module is installed during system boot, all PCI devices
 338  * are checked one by one to see if it supports EEH. The function
 339  * is introduced for the purpose. By default, EEH has been enabled
 340  * on all PCI devices. That's to say, we only need do necessary
 341  * initialization on the corresponding eeh device and create PE
 342  * accordingly.
 343  *
 344  * It's notable that's unsafe to retrieve the EEH device through
 345  * the corresponding PCI device. During the PCI device hotplug, which
 346  * was possiblly triggered by EEH core, the binding between EEH device
 347  * and the PCI device isn't built yet.
 348  */
 349 static void *pnv_eeh_probe(struct pci_dn *pdn, void *data)
 350 {
 351         struct pci_controller *hose = pdn->phb;
 352         struct pnv_phb *phb = hose->private_data;
 353         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
 354         uint32_t pcie_flags;
 355         int ret;
 356
 357         /*
 358          * When probing the root bridge, which doesn't have any
 359          * subordinate PCI devices. We don't have OF node for
 360          * the root bridge. So it's not reasonable to continue
 361          * the probing.
 362          */
 363         if (!edev || edev->pe)
 364                 return NULL;
 365
 366         /* Skip for PCI-ISA bridge */
 367         if ((pdn->class_code >> 8) == PCI_CLASS_BRIDGE_ISA)
 368                 return NULL;
 369
 370         /* Initialize eeh device */
 371         edev->class_code = pdn->class_code;
 372         edev->mode      &= 0xFFFFFF00;
 373         edev->pcix_cap = pnv_eeh_find_cap(pdn, PCI_CAP_ID_PCIX);
 374         edev->pcie_cap = pnv_eeh_find_cap(pdn, PCI_CAP_ID_EXP);
 375         edev->af_cap   = pnv_eeh_find_cap(pdn, PCI_CAP_ID_AF);
 376         edev->aer_cap  = pnv_eeh_find_ecap(pdn, PCI_EXT_CAP_ID_ERR);
 377         if ((edev->class_code >> 8) == PCI_CLASS_BRIDGE_PCI) {
 378                 edev->mode |= EEH_DEV_BRIDGE;
 379                 if (edev->pcie_cap) {
 380                         pnv_pci_cfg_read(pdn, edev->pcie_cap + PCI_EXP_FLAGS,
 381                                          2, &pcie_flags);
 382                         pcie_flags = (pcie_flags & PCI_EXP_FLAGS_TYPE) >> 4;
 383                         if (pcie_flags == PCI_EXP_TYPE_ROOT_PORT)
 384                                 edev->mode |= EEH_DEV_ROOT_PORT;
 385                         else if (pcie_flags == PCI_EXP_TYPE_DOWNSTREAM)
 386                                 edev->mode |= EEH_DEV_DS_PORT;
 387                 }
 388         }
 389
 390         edev->config_addr    = (pdn->busno << 8) | (pdn->devfn);
 391         edev->pe_config_addr = phb->ioda.pe_rmap[edev->config_addr];
 392
 393         /* Create PE */
 394         ret = eeh_add_to_parent_pe(edev);
 395         if (ret) {
 396                 pr_warn("%s: Can't add PCI dev %04x:%02x:%02x.%01x to parent PE (%d)\n",
 397                         __func__, hose->global_number, pdn->busno,
 398                         PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn), ret);
 399                 return NULL;
 400         }
 401
 402         /*
 403          * If the PE contains any one of following adapters, the
 404          * PCI config space can't be accessed when dumping EEH log.
 405          * Otherwise, we will run into fenced PHB caused by shortage
 406          * of outbound credits in the adapter. The PCI config access
 407          * should be blocked until PE reset. MMIO access is dropped
 408          * by hardware certainly. In order to drop PCI config requests,
 409          * one more flag (EEH_PE_CFG_RESTRICTED) is introduced, which
 410          * will be checked in the backend for PE state retrival. If
 411          * the PE becomes frozen for the first time and the flag has
 412          * been set for the PE, we will set EEH_PE_CFG_BLOCKED for
 413          * that PE to block its config space.
 414          *
 415          * Broadcom Austin 4-ports NICs (14e4:1657)
 416          * Broadcom Shiner 4-ports 1G NICs (14e4:168a)
 417          * Broadcom Shiner 2-ports 10G NICs (14e4:168e)
 418          */
 419         if ((pdn->vendor_id == PCI_VENDOR_ID_BROADCOM &&
 420              pdn->device_id == 0x1657) ||
 421             (pdn->vendor_id == PCI_VENDOR_ID_BROADCOM &&
 422              pdn->device_id == 0x168a) ||
 423             (pdn->vendor_id == PCI_VENDOR_ID_BROADCOM &&
 424              pdn->device_id == 0x168e))
 425                 edev->pe->state |= EEH_PE_CFG_RESTRICTED;
 426
 427         /*
 428          * Cache the PE primary bus, which can't be fetched when
 429          * full hotplug is in progress. In that case, all child
 430          * PCI devices of the PE are expected to be removed prior
 431          * to PE reset.
 432          */
 433         if (!(edev->pe->state & EEH_PE_PRI_BUS)) {
 434                 edev->pe->bus = pci_find_bus(hose->global_number,
 435                                              pdn->busno);
 436                 if (edev->pe->bus)
 437                         edev->pe->state |= EEH_PE_PRI_BUS;
 438         }
 439
 440         /*
 441          * Enable EEH explicitly so that we will do EEH check
 442          * while accessing I/O stuff
 443          */
 444         eeh_add_flag(EEH_ENABLED);
 445
 446         /* Save memory bars */
 447         eeh_save_bars(edev);
 448
 449         return NULL;
 450 }
 451
 452 /**
 453  * pnv_eeh_set_option - Initialize EEH or MMIO/DMA reenable
 454  * @pe: EEH PE
 455  * @option: operation to be issued
 456  *
 457  * The function is used to control the EEH functionality globally.
 458  * Currently, following options are support according to PAPR:
 459  * Enable EEH, Disable EEH, Enable MMIO and Enable DMA
 460  */
 461 static int pnv_eeh_set_option(struct eeh_pe *pe, int option)
 462 {
 463         struct pci_controller *hose = pe->phb;
 464         struct pnv_phb *phb = hose->private_data;
 465         bool freeze_pe = false;
 466         int opt;
 467         s64 rc;
 468
 469         switch (option) {
 470         case EEH_OPT_DISABLE:
 471                 return -EPERM;
 472         case EEH_OPT_ENABLE:
 473                 return 0;
 474         case EEH_OPT_THAW_MMIO:
 475                 opt = OPAL_EEH_ACTION_CLEAR_FREEZE_MMIO;
 476                 break;
 477         case EEH_OPT_THAW_DMA:
 478                 opt = OPAL_EEH_ACTION_CLEAR_FREEZE_DMA;
 479                 break;
 480         case EEH_OPT_FREEZE_PE:
 481                 freeze_pe = true;
 482                 opt = OPAL_EEH_ACTION_SET_FREEZE_ALL;
 483                 break;
 484         default:
 485                 pr_warn("%s: Invalid option %d\n", __func__, option);
 486                 return -EINVAL;
 487         }
 488
 489         /* Freeze master and slave PEs if PHB supports compound PEs */
 490         if (freeze_pe) {
 491                 if (phb->freeze_pe) {
 492                         phb->freeze_pe(phb, pe->addr);
 493                         return 0;
 494                 }
 495
 496                 rc = opal_pci_eeh_freeze_set(phb->opal_id, pe->addr, opt);
 497                 if (rc != OPAL_SUCCESS) {
 498                         pr_warn("%s: Failure %lld freezing PHB#%x-PE#%x\n",
 499                                 __func__, rc, phb->hose->global_number,
 500                                 pe->addr);
 501                         return -EIO;
 502                 }
 503
 504                 return 0;
 505         }
 506
 507         /* Unfreeze master and slave PEs if PHB supports */
 508         if (phb->unfreeze_pe)
 509                 return phb->unfreeze_pe(phb, pe->addr, opt);
 510
 511         rc = opal_pci_eeh_freeze_clear(phb->opal_id, pe->addr, opt);
 512         if (rc != OPAL_SUCCESS) {
 513                 pr_warn("%s: Failure %lld enable %d for PHB#%x-PE#%x\n",
 514                         __func__, rc, option, phb->hose->global_number,
 515                         pe->addr);
 516                 return -EIO;
 517         }
 518
 519         return 0;
 520 }
 521
 522 /**
 523  * pnv_eeh_get_pe_addr - Retrieve PE address
 524  * @pe: EEH PE
 525  *
 526  * Retrieve the PE address according to the given tranditional
 527  * PCI BDF (Bus/Device/Function) address.
 528  */
 529 static int pnv_eeh_get_pe_addr(struct eeh_pe *pe)
 530 {
 531         return pe->addr;
 532 }
 533
 534 static void pnv_eeh_get_phb_diag(struct eeh_pe *pe)
 535 {
 536         struct pnv_phb *phb = pe->phb->private_data;
 537         s64 rc;
 538
 539         rc = opal_pci_get_phb_diag_data2(phb->opal_id, pe->data,
 540                                          PNV_PCI_DIAG_BUF_SIZE);
 541         if (rc != OPAL_SUCCESS)
 542                 pr_warn("%s: Failure %lld getting PHB#%x diag-data\n",
 543                         __func__, rc, pe->phb->global_number);
 544 }
 545
 546 static int pnv_eeh_get_phb_state(struct eeh_pe *pe)
 547 {
 548         struct pnv_phb *phb = pe->phb->private_data;
 549         u8 fstate;
 550         __be16 pcierr;
 551         s64 rc;
 552         int result = 0;
 553
 554         rc = opal_pci_eeh_freeze_status(phb->opal_id,
 555                                         pe->addr,
 556                                         &fstate,
 557                                         &pcierr,
 558                                         NULL);
 559         if (rc != OPAL_SUCCESS) {
 560                 pr_warn("%s: Failure %lld getting PHB#%x state\n",
 561                         __func__, rc, phb->hose->global_number);
 562                 return EEH_STATE_NOT_SUPPORT;
 563         }
 564
 565         /*
 566          * Check PHB state. If the PHB is frozen for the
 567          * first time, to dump the PHB diag-data.
 568          */
 569         if (be16_to_cpu(pcierr) != OPAL_EEH_PHB_ERROR) {
 570                 result = (EEH_STATE_MMIO_ACTIVE  |
 571                           EEH_STATE_DMA_ACTIVE   |
 572                           EEH_STATE_MMIO_ENABLED |
 573                           EEH_STATE_DMA_ENABLED);
 574         } else if (!(pe->state & EEH_PE_ISOLATED)) {
 575                 eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
 576                 pnv_eeh_get_phb_diag(pe);
 577
 578                 if (eeh_has_flag(EEH_EARLY_DUMP_LOG))
 579                         pnv_pci_dump_phb_diag_data(pe->phb, pe->data);
 580         }
 581
 582         return result;
 583 }
 584
 585 static int pnv_eeh_get_pe_state(struct eeh_pe *pe)
 586 {
 587         struct pnv_phb *phb = pe->phb->private_data;
 588         u8 fstate;
 589         __be16 pcierr;
 590         s64 rc;
 591         int result;
 592
 593         /*
 594          * We don't clobber hardware frozen state until PE
 595          * reset is completed. In order to keep EEH core
 596          * moving forward, we have to return operational
 597          * state during PE reset.
 598          */
 599         if (pe->state & EEH_PE_RESET) {
 600                 result = (EEH_STATE_MMIO_ACTIVE  |
 601                           EEH_STATE_DMA_ACTIVE   |
 602                           EEH_STATE_MMIO_ENABLED |
 603                           EEH_STATE_DMA_ENABLED);
 604                 return result;
 605         }
 606
 607         /*
 608          * Fetch PE state from hardware. If the PHB
 609          * supports compound PE, let it handle that.
 610          */
 611         if (phb->get_pe_state) {
 612                 fstate = phb->get_pe_state(phb, pe->addr);
 613         } else {
 614                 rc = opal_pci_eeh_freeze_status(phb->opal_id,
 615                                                 pe->addr,
 616                                                 &fstate,
 617                                                 &pcierr,
 618                                                 NULL);
 619                 if (rc != OPAL_SUCCESS) {
 620                         pr_warn("%s: Failure %lld getting PHB#%x-PE%x state\n",
 621                                 __func__, rc, phb->hose->global_number,
 622                                 pe->addr);
 623                         return EEH_STATE_NOT_SUPPORT;
 624                 }
 625         }
 626
 627         /* Figure out state */
 628         switch (fstate) {
 629         case OPAL_EEH_STOPPED_NOT_FROZEN:
 630                 result = (EEH_STATE_MMIO_ACTIVE  |
 631                           EEH_STATE_DMA_ACTIVE   |
 632                           EEH_STATE_MMIO_ENABLED |
 633                           EEH_STATE_DMA_ENABLED);
 634                 break;
 635         case OPAL_EEH_STOPPED_MMIO_FREEZE:
 636                 result = (EEH_STATE_DMA_ACTIVE |
 637                           EEH_STATE_DMA_ENABLED);
 638                 break;
 639         case OPAL_EEH_STOPPED_DMA_FREEZE:
 640                 result = (EEH_STATE_MMIO_ACTIVE |
 641                           EEH_STATE_MMIO_ENABLED);
 642                 break;
 643         case OPAL_EEH_STOPPED_MMIO_DMA_FREEZE:
 644                 result = 0;
 645                 break;
 646         case OPAL_EEH_STOPPED_RESET:
 647                 result = EEH_STATE_RESET_ACTIVE;
 648                 break;
 649         case OPAL_EEH_STOPPED_TEMP_UNAVAIL:
 650                 result = EEH_STATE_UNAVAILABLE;
 651                 break;
 652         case OPAL_EEH_STOPPED_PERM_UNAVAIL:
 653                 result = EEH_STATE_NOT_SUPPORT;
 654                 break;
 655         default:
 656                 result = EEH_STATE_NOT_SUPPORT;
 657                 pr_warn("%s: Invalid PHB#%x-PE#%x state %x\n",
 658                         __func__, phb->hose->global_number,
 659                         pe->addr, fstate);
 660         }
 661
 662         /*
 663          * If PHB supports compound PE, to freeze all
 664          * slave PEs for consistency.
 665          *
 666          * If the PE is switching to frozen state for the
 667          * first time, to dump the PHB diag-data.
 668          */
 669         if (!(result & EEH_STATE_NOT_SUPPORT) &&
 670             !(result & EEH_STATE_UNAVAILABLE) &&
 671             !(result & EEH_STATE_MMIO_ACTIVE) &&
 672             !(result & EEH_STATE_DMA_ACTIVE)  &&
 673             !(pe->state & EEH_PE_ISOLATED)) {
 674                 if (phb->freeze_pe)
 675                         phb->freeze_pe(phb, pe->addr);
 676
 677                 eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
 678                 pnv_eeh_get_phb_diag(pe);
 679
 680                 if (eeh_has_flag(EEH_EARLY_DUMP_LOG))
 681                         pnv_pci_dump_phb_diag_data(pe->phb, pe->data);
 682         }
 683
 684         return result;
 685 }
 686
 687 /**
 688  * pnv_eeh_get_state - Retrieve PE state
 689  * @pe: EEH PE
 690  * @delay: delay while PE state is temporarily unavailable
 691  *
 692  * Retrieve the state of the specified PE. For IODA-compitable
 693  * platform, it should be retrieved from IODA table. Therefore,
 694  * we prefer passing down to hardware implementation to handle
 695  * it.
 696  */
 697 static int pnv_eeh_get_state(struct eeh_pe *pe, int *delay)
 698 {
 699         int ret;
 700
 701         if (pe->type & EEH_PE_PHB)
 702                 ret = pnv_eeh_get_phb_state(pe);
 703         else
 704                 ret = pnv_eeh_get_pe_state(pe);
 705
 706         if (!delay)
 707                 return ret;
 708
 709         /*
 710          * If the PE state is temporarily unavailable,
 711          * to inform the EEH core delay for default
 712          * period (1 second)
 713          */
 714         *delay = 0;
 715         if (ret & EEH_STATE_UNAVAILABLE)
 716                 *delay = 1000;
 717
 718         return ret;
 719 }
 720
 721 static s64 pnv_eeh_poll(unsigned long id)
 722 {
 723         s64 rc = OPAL_HARDWARE;
 724
 725         while (1) {
 726                 rc = opal_pci_poll(id);
 727                 if (rc <= 0)
 728                         break;
 729
 730                 if (system_state < SYSTEM_RUNNING)
 731                         udelay(1000 * rc);
 732                 else
 733                         msleep(rc);
 734         }
 735
 736         return rc;
 737 }
 738
 739 int pnv_eeh_phb_reset(struct pci_controller *hose, int option)
 740 {
 741         struct pnv_phb *phb = hose->private_data;
 742         s64 rc = OPAL_HARDWARE;
 743
 744         pr_debug("%s: Reset PHB#%x, option=%d\n",
 745                  __func__, hose->global_number, option);
 746
 747         /* Issue PHB complete reset request */
 748         if (option == EEH_RESET_FUNDAMENTAL ||
 749             option == EEH_RESET_HOT)
 750                 rc = opal_pci_reset(phb->opal_id,
 751                                     OPAL_RESET_PHB_COMPLETE,
 752                                     OPAL_ASSERT_RESET);
 753         else if (option == EEH_RESET_DEACTIVATE)
 754                 rc = opal_pci_reset(phb->opal_id,
 755                                     OPAL_RESET_PHB_COMPLETE,
 756                                     OPAL_DEASSERT_RESET);
 757         if (rc < 0)
 758                 goto out;
 759
 760         /*
 761          * Poll state of the PHB until the request is done
 762          * successfully. The PHB reset is usually PHB complete
 763          * reset followed by hot reset on root bus. So we also
 764          * need the PCI bus settlement delay.
 765          */
 766         rc = pnv_eeh_poll(phb->opal_id);
 767         if (option == EEH_RESET_DEACTIVATE) {
 768                 if (system_state < SYSTEM_RUNNING)
 769                         udelay(1000 * EEH_PE_RST_SETTLE_TIME);
 770                 else
 771                         msleep(EEH_PE_RST_SETTLE_TIME);
 772         }
 773 out:
 774         if (rc != OPAL_SUCCESS)
 775                 return -EIO;
 776
 777         return 0;
 778 }
 779
 780 static int pnv_eeh_root_reset(struct pci_controller *hose, int option)
 781 {
 782         struct pnv_phb *phb = hose->private_data;
 783         s64 rc = OPAL_HARDWARE;
 784
 785         pr_debug("%s: Reset PHB#%x, option=%d\n",
 786                  __func__, hose->global_number, option);
 787
 788         /*
 789          * During the reset deassert time, we needn't care
 790          * the reset scope because the firmware does nothing
 791          * for fundamental or hot reset during deassert phase.
 792          */
 793         if (option == EEH_RESET_FUNDAMENTAL)
 794                 rc = opal_pci_reset(phb->opal_id,
 795                                     OPAL_RESET_PCI_FUNDAMENTAL,
 796                                     OPAL_ASSERT_RESET);
 797         else if (option == EEH_RESET_HOT)
 798                 rc = opal_pci_reset(phb->opal_id,
 799                                     OPAL_RESET_PCI_HOT,
 800                                     OPAL_ASSERT_RESET);
 801         else if (option == EEH_RESET_DEACTIVATE)
 802                 rc = opal_pci_reset(phb->opal_id,
 803                                     OPAL_RESET_PCI_HOT,
 804                                     OPAL_DEASSERT_RESET);
 805         if (rc < 0)
 806                 goto out;
 807
 808         /* Poll state of the PHB until the request is done */
 809         rc = pnv_eeh_poll(phb->opal_id);
 810         if (option == EEH_RESET_DEACTIVATE)
 811                 msleep(EEH_PE_RST_SETTLE_TIME);
 812 out:
 813         if (rc != OPAL_SUCCESS)
 814                 return -EIO;
 815
 816         return 0;
 817 }
 818
 819 static int __pnv_eeh_bridge_reset(struct pci_dev *dev, int option)
 820 {
 821         struct pci_dn *pdn = pci_get_pdn_by_devfn(dev->bus, dev->devfn);
 822         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
 823         int aer = edev ? edev->aer_cap : 0;
 824         u32 ctrl;
 825
 826         pr_debug("%s: Reset PCI bus %04x:%02x with option %d\n",
 827                  __func__, pci_domain_nr(dev->bus),
 828                  dev->bus->number, option);
 829
 830         switch (option) {
 831         case EEH_RESET_FUNDAMENTAL:
 832         case EEH_RESET_HOT:
 833                 /* Don't report linkDown event */
 834                 if (aer) {
 835                         eeh_ops->read_config(pdn, aer + PCI_ERR_UNCOR_MASK,
 836                                              4, &ctrl);
 837                         ctrl |= PCI_ERR_UNC_SURPDN;
 838                         eeh_ops->write_config(pdn, aer + PCI_ERR_UNCOR_MASK,
 839                                               4, ctrl);
 840                 }
 841
 842                 eeh_ops->read_config(pdn, PCI_BRIDGE_CONTROL, 2, &ctrl);
 843                 ctrl |= PCI_BRIDGE_CTL_BUS_RESET;
 844                 eeh_ops->write_config(pdn, PCI_BRIDGE_CONTROL, 2, ctrl);
 845
 846                 msleep(EEH_PE_RST_HOLD_TIME);
 847                 break;
 848         case EEH_RESET_DEACTIVATE:
 849                 eeh_ops->read_config(pdn, PCI_BRIDGE_CONTROL, 2, &ctrl);
 850                 ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
 851                 eeh_ops->write_config(pdn, PCI_BRIDGE_CONTROL, 2, ctrl);
 852
 853                 msleep(EEH_PE_RST_SETTLE_TIME);
 854
 855                 /* Continue reporting linkDown event */
 856                 if (aer) {
 857                         eeh_ops->read_config(pdn, aer + PCI_ERR_UNCOR_MASK,
 858                                              4, &ctrl);
 859                         ctrl &= ~PCI_ERR_UNC_SURPDN;
 860                         eeh_ops->write_config(pdn, aer + PCI_ERR_UNCOR_MASK,
 861                                               4, ctrl);
 862                 }
 863
 864                 break;
 865         }
 866
 867         return 0;
 868 }
 869
 870 static int pnv_eeh_bridge_reset(struct pci_dev *pdev, int option)
 871 {
 872         struct pci_controller *hose = pci_bus_to_host(pdev->bus);
 873         struct pnv_phb *phb = hose->private_data;
 874         struct device_node *dn = pci_device_to_OF_node(pdev);
 875         uint64_t id = PCI_SLOT_ID(phb->opal_id,
 876                                   (pdev->bus->number << 8) | pdev->devfn);
 877         uint8_t scope;
 878         int64_t rc;
 879
 880         /* Hot reset to the bus if firmware cannot handle */
 881         if (!dn || !of_get_property(dn, "ibm,reset-by-firmware", NULL))
 882                 return __pnv_eeh_bridge_reset(pdev, option);
 883
 884         switch (option) {
 885         case EEH_RESET_FUNDAMENTAL:
 886                 scope = OPAL_RESET_PCI_FUNDAMENTAL;
 887                 break;
 888         case EEH_RESET_HOT:
 889                 scope = OPAL_RESET_PCI_HOT;
 890                 break;
 891         case EEH_RESET_DEACTIVATE:
 892                 return 0;
 893         default:
 894                 dev_dbg(&pdev->dev, "%s: Unsupported reset %d\n",
 895                         __func__, option);
 896                 return -EINVAL;
 897         }
 898
 899         rc = opal_pci_reset(id, scope, OPAL_ASSERT_RESET);
 900         if (rc <= OPAL_SUCCESS)
 901                 goto out;
 902
 903         rc = pnv_eeh_poll(id);
 904 out:
 905         return (rc == OPAL_SUCCESS) ? 0 : -EIO;
 906 }
 907
 908 void pnv_pci_reset_secondary_bus(struct pci_dev *dev)
 909 {
 910         struct pci_controller *hose;
 911
 912         if (pci_is_root_bus(dev->bus)) {
 913                 hose = pci_bus_to_host(dev->bus);
 914                 pnv_eeh_root_reset(hose, EEH_RESET_HOT);
 915                 pnv_eeh_root_reset(hose, EEH_RESET_DEACTIVATE);
 916         } else {
 917                 pnv_eeh_bridge_reset(dev, EEH_RESET_HOT);
 918                 pnv_eeh_bridge_reset(dev, EEH_RESET_DEACTIVATE);
 919         }
 920 }
 921
 922 static void pnv_eeh_wait_for_pending(struct pci_dn *pdn, const char *type,
 923                                      int pos, u16 mask)
 924 {
 925         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
 926         int i, status = 0;
 927
 928         /* Wait for Transaction Pending bit to be cleared */
 929         for (i = 0; i < 4; i++) {
 930                 eeh_ops->read_config(pdn, pos, 2, &status);
 931                 if (!(status & mask))
 932                         return;
 933
 934                 msleep((1 << i) * 100);
 935         }
 936
 937         pr_warn("%s: Pending transaction while issuing %sFLR to %04x:%02x:%02x.%01x\n",
 938                 __func__, type,
 939                 edev->phb->global_number, pdn->busno,
 940                 PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn));
 941 }
 942
 943 static int pnv_eeh_do_flr(struct pci_dn *pdn, int option)
 944 {
 945         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
 946         u32 reg = 0;
 947
 948         if (WARN_ON(!edev->pcie_cap))
 949                 return -ENOTTY;
 950
 951         eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCAP, 4, &reg);
 952         if (!(reg & PCI_EXP_DEVCAP_FLR))
 953                 return -ENOTTY;
 954
 955         switch (option) {
 956         case EEH_RESET_HOT:
 957         case EEH_RESET_FUNDAMENTAL:
 958                 pnv_eeh_wait_for_pending(pdn, "",
 959                                          edev->pcie_cap + PCI_EXP_DEVSTA,
 960                                          PCI_EXP_DEVSTA_TRPND);
 961                 eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
 962                                      4, &reg);
 963                 reg |= PCI_EXP_DEVCTL_BCR_FLR;
 964                 eeh_ops->write_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
 965                                       4, reg);
 966                 msleep(EEH_PE_RST_HOLD_TIME);
 967                 break;
 968         case EEH_RESET_DEACTIVATE:
 969                 eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
 970                                      4, &reg);
 971                 reg &= ~PCI_EXP_DEVCTL_BCR_FLR;
 972                 eeh_ops->write_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
 973                                       4, reg);
 974                 msleep(EEH_PE_RST_SETTLE_TIME);
 975                 break;
 976         }
 977
 978         return 0;
 979 }
 980
 981 static int pnv_eeh_do_af_flr(struct pci_dn *pdn, int option)
 982 {
 983         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
 984         u32 cap = 0;
 985
 986         if (WARN_ON(!edev->af_cap))
 987                 return -ENOTTY;
 988
 989         eeh_ops->read_config(pdn, edev->af_cap + PCI_AF_CAP, 1, &cap);
 990         if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR))
 991                 return -ENOTTY;
 992
 993         switch (option) {
 994         case EEH_RESET_HOT:
 995         case EEH_RESET_FUNDAMENTAL:
 996                 /*
 997                  * Wait for Transaction Pending bit to clear. A word-aligned
 998                  * test is used, so we use the conrol offset rather than status
 999                  * and shift the test bit to match.
1000                  */
1001                 pnv_eeh_wait_for_pending(pdn, "AF",
1002                                          edev->af_cap + PCI_AF_CTRL,
1003                                          PCI_AF_STATUS_TP << 8);
1004                 eeh_ops->write_config(pdn, edev->af_cap + PCI_AF_CTRL,
1005                                       1, PCI_AF_CTRL_FLR);
1006                 msleep(EEH_PE_RST_HOLD_TIME);
1007                 break;
1008         case EEH_RESET_DEACTIVATE:
1009                 eeh_ops->write_config(pdn, edev->af_cap + PCI_AF_CTRL, 1, 0);
1010                 msleep(EEH_PE_RST_SETTLE_TIME);
1011                 break;
1012         }
1013
1014         return 0;
1015 }
1016
1017 static int pnv_eeh_reset_vf_pe(struct eeh_pe *pe, int option)
1018 {
1019         struct eeh_dev *edev;
1020         struct pci_dn *pdn;
1021         int ret;
1022
1023         /* The VF PE should have only one child device */
1024         edev = list_first_entry_or_null(&pe->edevs, struct eeh_dev, list);
1025         pdn = eeh_dev_to_pdn(edev);
1026         if (!pdn)
1027                 return -ENXIO;
1028
1029         ret = pnv_eeh_do_flr(pdn, option);
1030         if (!ret)
1031                 return ret;
1032
1033         return pnv_eeh_do_af_flr(pdn, option);
1034 }
1035
1036 /**
1037  * pnv_eeh_reset - Reset the specified PE
1038  * @pe: EEH PE
1039  * @option: reset option
1040  *
1041  * Do reset on the indicated PE. For PCI bus sensitive PE,
1042  * we need to reset the parent p2p bridge. The PHB has to
1043  * be reinitialized if the p2p bridge is root bridge. For
1044  * PCI device sensitive PE, we will try to reset the device
1045  * through FLR. For now, we don't have OPAL APIs to do HARD
1046  * reset yet, so all reset would be SOFT (HOT) reset.
1047  */
1048 static int pnv_eeh_reset(struct eeh_pe *pe, int option)
1049 {
1050         struct pci_controller *hose = pe->phb;
1051         struct pnv_phb *phb;
1052         struct pci_bus *bus;
1053         int64_t rc;
1054
1055         /*
1056          * For PHB reset, we always have complete reset. For those PEs whose
1057          * primary bus derived from root complex (root bus) or root port
1058          * (usually bus#1), we apply hot or fundamental reset on the root port.
1059          * For other PEs, we always have hot reset on the PE primary bus.
1060          *
1061          * Here, we have different design to pHyp, which always clear the
1062          * frozen state during PE reset. However, the good idea here from
1063          * benh is to keep frozen state before we get PE reset done completely
1064          * (until BAR restore). With the frozen state, HW drops illegal IO
1065          * or MMIO access, which can incur recrusive frozen PE during PE
1066          * reset. The side effect is that EEH core has to clear the frozen
1067          * state explicitly after BAR restore.
1068          */
1069         if (pe->type & EEH_PE_PHB)
1070                 return pnv_eeh_phb_reset(hose, option);
1071
1072         /*
1073          * The frozen PE might be caused by PAPR error injection
1074          * registers, which are expected to be cleared after hitting
1075          * frozen PE as stated in the hardware spec. Unfortunately,
1076          * that's not true on P7IOC. So we have to clear it manually
1077          * to avoid recursive EEH errors during recovery.
1078          */
1079         phb = hose->private_data;
1080         if (phb->model == PNV_PHB_MODEL_P7IOC &&
1081             (option == EEH_RESET_HOT ||
1082              option == EEH_RESET_FUNDAMENTAL)) {
1083                 rc = opal_pci_reset(phb->opal_id,
1084                                     OPAL_RESET_PHB_ERROR,
1085                                     OPAL_ASSERT_RESET);
1086                 if (rc != OPAL_SUCCESS) {
1087                         pr_warn("%s: Failure %lld clearing error injection registers\n",
1088                                 __func__, rc);
1089                         return -EIO;
1090                 }
1091         }
1092
1093         if (pe->type & EEH_PE_VF)
1094                 return pnv_eeh_reset_vf_pe(pe, option);
1095
1096         bus = eeh_pe_bus_get(pe);
1097         if (!bus) {
1098                 pr_err("%s: Cannot find PCI bus for PHB#%d-PE#%x\n",
1099                         __func__, pe->phb->global_number, pe->addr);
1100                 return -EIO;
1101         }
1102
1103         if (pci_is_root_bus(bus) ||
1104             pci_is_root_bus(bus->parent))
1105                 return pnv_eeh_root_reset(hose, option);
1106
1107         return pnv_eeh_bridge_reset(bus->self, option);
1108 }
1109
1110 /**
1111  * pnv_eeh_wait_state - Wait for PE state
1112  * @pe: EEH PE
1113  * @max_wait: maximal period in millisecond
1114  *
1115  * Wait for the state of associated PE. It might take some time
1116  * to retrieve the PE's state.
1117  */
1118 static int pnv_eeh_wait_state(struct eeh_pe *pe, int max_wait)
1119 {
1120         int ret;
1121         int mwait;
1122
1123         while (1) {
1124                 ret = pnv_eeh_get_state(pe, &mwait);
1125
1126                 /*
1127                  * If the PE's state is temporarily unavailable,
1128                  * we have to wait for the specified time. Otherwise,
1129                  * the PE's state will be returned immediately.
1130                  */
1131                 if (ret != EEH_STATE_UNAVAILABLE)
1132                         return ret;
1133
1134                 if (max_wait <= 0) {
1135                         pr_warn("%s: Timeout getting PE#%x's state (%d)\n",
1136                                 __func__, pe->addr, max_wait);
1137                         return EEH_STATE_NOT_SUPPORT;
1138                 }
1139
1140                 max_wait -= mwait;
1141                 msleep(mwait);
1142         }
1143
1144         return EEH_STATE_NOT_SUPPORT;
1145 }
1146
1147 /**
1148  * pnv_eeh_get_log - Retrieve error log
1149  * @pe: EEH PE
1150  * @severity: temporary or permanent error log
1151  * @drv_log: driver log to be combined with retrieved error log
1152  * @len: length of driver log
1153  *
1154  * Retrieve the temporary or permanent error from the PE.
1155  */
1156 static int pnv_eeh_get_log(struct eeh_pe *pe, int severity,
1157                            char *drv_log, unsigned long len)
1158 {
1159         if (!eeh_has_flag(EEH_EARLY_DUMP_LOG))
1160                 pnv_pci_dump_phb_diag_data(pe->phb, pe->data);
1161
1162         return 0;
1163 }
1164
1165 /**
1166  * pnv_eeh_configure_bridge - Configure PCI bridges in the indicated PE
1167  * @pe: EEH PE
1168  *
1169  * The function will be called to reconfigure the bridges included
1170  * in the specified PE so that the mulfunctional PE would be recovered
1171  * again.
1172  */
1173 static int pnv_eeh_configure_bridge(struct eeh_pe *pe)
1174 {
1175         return 0;
1176 }
1177
1178 /**
1179  * pnv_pe_err_inject - Inject specified error to the indicated PE
1180  * @pe: the indicated PE
1181  * @type: error type
1182  * @func: specific error type
1183  * @addr: address
1184  * @mask: address mask
1185  *
1186  * The routine is called to inject specified error, which is
1187  * determined by @type and @func, to the indicated PE for
1188  * testing purpose.
1189  */
1190 static int pnv_eeh_err_inject(struct eeh_pe *pe, int type, int func,
1191                               unsigned long addr, unsigned long mask)
1192 {
1193         struct pci_controller *hose = pe->phb;
1194         struct pnv_phb *phb = hose->private_data;
1195         s64 rc;
1196
1197         if (type != OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR &&
1198             type != OPAL_ERR_INJECT_TYPE_IOA_BUS_ERR64) {
1199                 pr_warn("%s: Invalid error type %d\n",
1200                         __func__, type);
1201                 return -ERANGE;
1202         }
1203
1204         if (func < OPAL_ERR_INJECT_FUNC_IOA_LD_MEM_ADDR ||
1205             func > OPAL_ERR_INJECT_FUNC_IOA_DMA_WR_TARGET) {
1206                 pr_warn("%s: Invalid error function %d\n",
1207                         __func__, func);
1208                 return -ERANGE;
1209         }
1210
1211         /* Firmware supports error injection ? */
1212         if (!opal_check_token(OPAL_PCI_ERR_INJECT)) {
1213                 pr_warn("%s: Firmware doesn't support error injection\n",
1214                         __func__);
1215                 return -ENXIO;
1216         }
1217
1218         /* Do error injection */
1219         rc = opal_pci_err_inject(phb->opal_id, pe->addr,
1220                                  type, func, addr, mask);
1221         if (rc != OPAL_SUCCESS) {
1222                 pr_warn("%s: Failure %lld injecting error "
1223                         "%d-%d to PHB#%x-PE#%x\n",
1224                         __func__, rc, type, func,
1225                         hose->global_number, pe->addr);
1226                 return -EIO;
1227         }
1228
1229         return 0;
1230 }
1231
1232 static inline bool pnv_eeh_cfg_blocked(struct pci_dn *pdn)
1233 {
1234         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
1235
1236         if (!edev || !edev->pe)
1237                 return false;
1238
1239         /*
1240          * We will issue FLR or AF FLR to all VFs, which are contained
1241          * in VF PE. It relies on the EEH PCI config accessors. So we
1242          * can't block them during the window.
1243          */
1244         if (edev->physfn && (edev->pe->state & EEH_PE_RESET))
1245                 return false;
1246
1247         if (edev->pe->state & EEH_PE_CFG_BLOCKED)
1248                 return true;
1249
1250         return false;
1251 }
1252
1253 static int pnv_eeh_read_config(struct pci_dn *pdn,
1254                                int where, int size, u32 *val)
1255 {
1256         if (!pdn)
1257                 return PCIBIOS_DEVICE_NOT_FOUND;
1258
1259         if (pnv_eeh_cfg_blocked(pdn)) {
1260                 *val = 0xFFFFFFFF;
1261                 return PCIBIOS_SET_FAILED;
1262         }
1263
1264         return pnv_pci_cfg_read(pdn, where, size, val);
1265 }
1266
1267 static int pnv_eeh_write_config(struct pci_dn *pdn,
1268                                 int where, int size, u32 val)
1269 {
1270         if (!pdn)
1271                 return PCIBIOS_DEVICE_NOT_FOUND;
1272
1273         if (pnv_eeh_cfg_blocked(pdn))
1274                 return PCIBIOS_SET_FAILED;
1275
1276         return pnv_pci_cfg_write(pdn, where, size, val);
1277 }
1278
1279 static void pnv_eeh_dump_hub_diag_common(struct OpalIoP7IOCErrorData *data)
1280 {
1281         /* GEM */
1282         if (data->gemXfir || data->gemRfir ||
1283             data->gemRirqfir || data->gemMask || data->gemRwof)
1284                 pr_info("  GEM: %016llx %016llx %016llx %016llx %016llx\n",
1285                         be64_to_cpu(data->gemXfir),
1286                         be64_to_cpu(data->gemRfir),
1287                         be64_to_cpu(data->gemRirqfir),
1288                         be64_to_cpu(data->gemMask),
1289                         be64_to_cpu(data->gemRwof));
1290
1291         /* LEM */
1292         if (data->lemFir || data->lemErrMask ||
1293             data->lemAction0 || data->lemAction1 || data->lemWof)
1294                 pr_info("  LEM: %016llx %016llx %016llx %016llx %016llx\n",
1295                         be64_to_cpu(data->lemFir),
1296                         be64_to_cpu(data->lemErrMask),
1297                         be64_to_cpu(data->lemAction0),
1298                         be64_to_cpu(data->lemAction1),
1299                         be64_to_cpu(data->lemWof));
1300 }
1301
1302 static void pnv_eeh_get_and_dump_hub_diag(struct pci_controller *hose)
1303 {
1304         struct pnv_phb *phb = hose->private_data;
1305         struct OpalIoP7IOCErrorData *data = &phb->diag.hub_diag;
1306         long rc;
1307
1308         rc = opal_pci_get_hub_diag_data(phb->hub_id, data, sizeof(*data));
1309         if (rc != OPAL_SUCCESS) {
1310                 pr_warn("%s: Failed to get HUB#%llx diag-data (%ld)\n",
1311                         __func__, phb->hub_id, rc);
1312                 return;
1313         }
1314
1315         switch (data->type) {
1316         case OPAL_P7IOC_DIAG_TYPE_RGC:
1317                 pr_info("P7IOC diag-data for RGC\n\n");
1318                 pnv_eeh_dump_hub_diag_common(data);
1319                 if (data->rgc.rgcStatus || data->rgc.rgcLdcp)
1320                         pr_info("  RGC: %016llx %016llx\n",
1321                                 be64_to_cpu(data->rgc.rgcStatus),
1322                                 be64_to_cpu(data->rgc.rgcLdcp));
1323                 break;
1324         case OPAL_P7IOC_DIAG_TYPE_BI:
1325                 pr_info("P7IOC diag-data for BI %s\n\n",
1326                         data->bi.biDownbound ? "Downbound" : "Upbound");
1327                 pnv_eeh_dump_hub_diag_common(data);
1328                 if (data->bi.biLdcp0 || data->bi.biLdcp1 ||
1329                     data->bi.biLdcp2 || data->bi.biFenceStatus)
1330                         pr_info("  BI:  %016llx %016llx %016llx %016llx\n",
1331                                 be64_to_cpu(data->bi.biLdcp0),
1332                                 be64_to_cpu(data->bi.biLdcp1),
1333                                 be64_to_cpu(data->bi.biLdcp2),
1334                                 be64_to_cpu(data->bi.biFenceStatus));
1335                 break;
1336         case OPAL_P7IOC_DIAG_TYPE_CI:
1337                 pr_info("P7IOC diag-data for CI Port %d\n\n",
1338                         data->ci.ciPort);
1339                 pnv_eeh_dump_hub_diag_common(data);
1340                 if (data->ci.ciPortStatus || data->ci.ciPortLdcp)
1341                         pr_info("  CI:  %016llx %016llx\n",
1342                                 be64_to_cpu(data->ci.ciPortStatus),
1343                                 be64_to_cpu(data->ci.ciPortLdcp));
1344                 break;
1345         case OPAL_P7IOC_DIAG_TYPE_MISC:
1346                 pr_info("P7IOC diag-data for MISC\n\n");
1347                 pnv_eeh_dump_hub_diag_common(data);
1348                 break;
1349         case OPAL_P7IOC_DIAG_TYPE_I2C:
1350                 pr_info("P7IOC diag-data for I2C\n\n");
1351                 pnv_eeh_dump_hub_diag_common(data);
1352                 break;
1353         default:
1354                 pr_warn("%s: Invalid type of HUB#%llx diag-data (%d)\n",
1355                         __func__, phb->hub_id, data->type);
1356         }
1357 }
1358
1359 static int pnv_eeh_get_pe(struct pci_controller *hose,
1360                           u16 pe_no, struct eeh_pe **pe)
1361 {
1362         struct pnv_phb *phb = hose->private_data;
1363         struct pnv_ioda_pe *pnv_pe;
1364         struct eeh_pe *dev_pe;
1365         struct eeh_dev edev;
1366
1367         /*
1368          * If PHB supports compound PE, to fetch
1369          * the master PE because slave PE is invisible
1370          * to EEH core.
1371          */
1372         pnv_pe = &phb->ioda.pe_array[pe_no];
1373         if (pnv_pe->flags & PNV_IODA_PE_SLAVE) {
1374                 pnv_pe = pnv_pe->master;
1375                 WARN_ON(!pnv_pe ||
1376                         !(pnv_pe->flags & PNV_IODA_PE_MASTER));
1377                 pe_no = pnv_pe->pe_number;
1378         }
1379
1380         /* Find the PE according to PE# */
1381         memset(&edev, 0, sizeof(struct eeh_dev));
1382         edev.phb = hose;
1383         edev.pe_config_addr = pe_no;
1384         dev_pe = eeh_pe_get(&edev);
1385         if (!dev_pe)
1386                 return -EEXIST;
1387
1388         /* Freeze the (compound) PE */
1389         *pe = dev_pe;
1390         if (!(dev_pe->state & EEH_PE_ISOLATED))
1391                 phb->freeze_pe(phb, pe_no);
1392
1393         /*
1394          * At this point, we're sure the (compound) PE should
1395          * have been frozen. However, we still need poke until
1396          * hitting the frozen PE on top level.
1397          */
1398         dev_pe = dev_pe->parent;
1399         while (dev_pe && !(dev_pe->type & EEH_PE_PHB)) {
1400                 int ret;
1401                 int active_flags = (EEH_STATE_MMIO_ACTIVE |
1402                                     EEH_STATE_DMA_ACTIVE);
1403
1404                 ret = eeh_ops->get_state(dev_pe, NULL);
1405                 if (ret <= 0 || (ret & active_flags) == active_flags) {
1406                         dev_pe = dev_pe->parent;
1407                         continue;
1408                 }
1409
1410                 /* Frozen parent PE */
1411                 *pe = dev_pe;
1412                 if (!(dev_pe->state & EEH_PE_ISOLATED))
1413                         phb->freeze_pe(phb, dev_pe->addr);
1414
1415                 /* Next one */
1416                 dev_pe = dev_pe->parent;
1417         }
1418
1419         return 0;
1420 }
1421
1422 /**
1423  * pnv_eeh_next_error - Retrieve next EEH error to handle
1424  * @pe: Affected PE
1425  *
1426  * The function is expected to be called by EEH core while it gets
1427  * special EEH event (without binding PE). The function calls to
1428  * OPAL APIs for next error to handle. The informational error is
1429  * handled internally by platform. However, the dead IOC, dead PHB,
1430  * fenced PHB and frozen PE should be handled by EEH core eventually.
1431  */
1432 static int pnv_eeh_next_error(struct eeh_pe **pe)
1433 {
1434         struct pci_controller *hose;
1435         struct pnv_phb *phb;
1436         struct eeh_pe *phb_pe, *parent_pe;
1437         __be64 frozen_pe_no;
1438         __be16 err_type, severity;
1439         int active_flags = (EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE);
1440         long rc;
1441         int state, ret = EEH_NEXT_ERR_NONE;
1442
1443         /*
1444          * While running here, it's safe to purge the event queue. The
1445          * event should still be masked.
1446          */
1447         eeh_remove_event(NULL, false);
1448
1449         list_for_each_entry(hose, &hose_list, list_node) {
1450                 /*
1451                  * If the subordinate PCI buses of the PHB has been
1452                  * removed or is exactly under error recovery, we
1453                  * needn't take care of it any more.
1454                  */
1455                 phb = hose->private_data;
1456                 phb_pe = eeh_phb_pe_get(hose);
1457                 if (!phb_pe || (phb_pe->state & EEH_PE_ISOLATED))
1458                         continue;
1459
1460                 rc = opal_pci_next_error(phb->opal_id,
1461                                          &frozen_pe_no, &err_type, &severity);
1462                 if (rc != OPAL_SUCCESS) {
1463                         pr_devel("%s: Invalid return value on "
1464                                  "PHB#%x (0x%lx) from opal_pci_next_error",
1465                                  __func__, hose->global_number, rc);
1466                         continue;
1467                 }
1468
1469                 /* If the PHB doesn't have error, stop processing */
1470                 if (be16_to_cpu(err_type) == OPAL_EEH_NO_ERROR ||
1471                     be16_to_cpu(severity) == OPAL_EEH_SEV_NO_ERROR) {
1472                         pr_devel("%s: No error found on PHB#%x\n",
1473                                  __func__, hose->global_number);
1474                         continue;
1475                 }
1476
1477                 /*
1478                  * Processing the error. We're expecting the error with
1479                  * highest priority reported upon multiple errors on the
1480                  * specific PHB.
1481                  */
1482                 pr_devel("%s: Error (%d, %d, %llu) on PHB#%x\n",
1483                         __func__, be16_to_cpu(err_type),
1484                         be16_to_cpu(severity), be64_to_cpu(frozen_pe_no),
1485                         hose->global_number);
1486                 switch (be16_to_cpu(err_type)) {
1487                 case OPAL_EEH_IOC_ERROR:
1488                         if (be16_to_cpu(severity) == OPAL_EEH_SEV_IOC_DEAD) {
1489                                 pr_err("EEH: dead IOC detected\n");
1490                                 ret = EEH_NEXT_ERR_DEAD_IOC;
1491                         } else if (be16_to_cpu(severity) == OPAL_EEH_SEV_INF) {
1492                                 pr_info("EEH: IOC informative error "
1493                                         "detected\n");
1494                                 pnv_eeh_get_and_dump_hub_diag(hose);
1495                                 ret = EEH_NEXT_ERR_NONE;
1496                         }
1497
1498                         break;
1499                 case OPAL_EEH_PHB_ERROR:
1500                         if (be16_to_cpu(severity) == OPAL_EEH_SEV_PHB_DEAD) {
1501                                 *pe = phb_pe;
1502                                 pr_err("EEH: dead PHB#%x detected, "
1503                                        "location: %s\n",
1504                                         hose->global_number,
1505                                         eeh_pe_loc_get(phb_pe));
1506                                 ret = EEH_NEXT_ERR_DEAD_PHB;
1507                         } else if (be16_to_cpu(severity) ==
1508                                    OPAL_EEH_SEV_PHB_FENCED) {
1509                                 *pe = phb_pe;
1510                                 pr_err("EEH: Fenced PHB#%x detected, "
1511                                        "location: %s\n",
1512                                         hose->global_number,
1513                                         eeh_pe_loc_get(phb_pe));
1514                                 ret = EEH_NEXT_ERR_FENCED_PHB;
1515                         } else if (be16_to_cpu(severity) == OPAL_EEH_SEV_INF) {
1516                                 pr_info("EEH: PHB#%x informative error "
1517                                         "detected, location: %s\n",
1518                                         hose->global_number,
1519                                         eeh_pe_loc_get(phb_pe));
1520                                 pnv_eeh_get_phb_diag(phb_pe);
1521                                 pnv_pci_dump_phb_diag_data(hose, phb_pe->data);
1522                                 ret = EEH_NEXT_ERR_NONE;
1523                         }
1524
1525                         break;
1526                 case OPAL_EEH_PE_ERROR:
1527                         /*
1528                          * If we can't find the corresponding PE, we
1529                          * just try to unfreeze.
1530                          */
1531                         if (pnv_eeh_get_pe(hose,
1532                                 be64_to_cpu(frozen_pe_no), pe)) {
1533                                 pr_info("EEH: Clear non-existing PHB#%x-PE#%llx\n",
1534                                         hose->global_number, be64_to_cpu(frozen_pe_no));
1535                                 pr_info("EEH: PHB location: %s\n",
1536                                         eeh_pe_loc_get(phb_pe));
1537
1538                                 /* Dump PHB diag-data */
1539                                 rc = opal_pci_get_phb_diag_data2(phb->opal_id,
1540                                         phb->diag.blob, PNV_PCI_DIAG_BUF_SIZE);
1541                                 if (rc == OPAL_SUCCESS)
1542                                         pnv_pci_dump_phb_diag_data(hose,
1543                                                         phb->diag.blob);
1544
1545                                 /* Try best to clear it */
1546                                 opal_pci_eeh_freeze_clear(phb->opal_id,
1547                                         frozen_pe_no,
1548                                         OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
1549                                 ret = EEH_NEXT_ERR_NONE;
1550                         } else if ((*pe)->state & EEH_PE_ISOLATED ||
1551                                    eeh_pe_passed(*pe)) {
1552                                 ret = EEH_NEXT_ERR_NONE;
1553                         } else {
1554                                 pr_err("EEH: Frozen PE#%x "
1555                                        "on PHB#%x detected\n",
1556                                        (*pe)->addr,
1557                                         (*pe)->phb->global_number);
1558                                 pr_err("EEH: PE location: %s, "
1559                                        "PHB location: %s\n",
1560                                        eeh_pe_loc_get(*pe),
1561                                        eeh_pe_loc_get(phb_pe));
1562                                 ret = EEH_NEXT_ERR_FROZEN_PE;
1563                         }
1564
1565                         break;
1566                 default:
1567                         pr_warn("%s: Unexpected error type %d\n",
1568                                 __func__, be16_to_cpu(err_type));
1569                 }
1570
1571                 /*
1572                  * EEH core will try recover from fenced PHB or
1573                  * frozen PE. In the time for frozen PE, EEH core
1574                  * enable IO path for that before collecting logs,
1575                  * but it ruins the site. So we have to dump the
1576                  * log in advance here.
1577                  */
1578                 if ((ret == EEH_NEXT_ERR_FROZEN_PE  ||
1579                     ret == EEH_NEXT_ERR_FENCED_PHB) &&
1580                     !((*pe)->state & EEH_PE_ISOLATED)) {
1581                         eeh_pe_state_mark(*pe, EEH_PE_ISOLATED);
1582                         pnv_eeh_get_phb_diag(*pe);
1583
1584                         if (eeh_has_flag(EEH_EARLY_DUMP_LOG))
1585                                 pnv_pci_dump_phb_diag_data((*pe)->phb,
1586                                                            (*pe)->data);
1587                 }
1588
1589                 /*
1590                  * We probably have the frozen parent PE out there and
1591                  * we need have to handle frozen parent PE firstly.
1592                  */
1593                 if (ret == EEH_NEXT_ERR_FROZEN_PE) {
1594                         parent_pe = (*pe)->parent;
1595                         while (parent_pe) {
1596                                 /* Hit the ceiling ? */
1597                                 if (parent_pe->type & EEH_PE_PHB)
1598                                         break;
1599
1600                                 /* Frozen parent PE ? */
1601                                 state = eeh_ops->get_state(parent_pe, NULL);
1602                                 if (state > 0 &&
1603                                     (state & active_flags) != active_flags)
1604                                         *pe = parent_pe;
1605
1606                                 /* Next parent level */
1607                                 parent_pe = parent_pe->parent;
1608                         }
1609
1610                         /* We possibly migrate to another PE */
1611                         eeh_pe_state_mark(*pe, EEH_PE_ISOLATED);
1612                 }
1613
1614                 /*
1615                  * If we have no errors on the specific PHB or only
1616                  * informative error there, we continue poking it.
1617                  * Otherwise, we need actions to be taken by upper
1618                  * layer.
1619                  */
1620                 if (ret > EEH_NEXT_ERR_INF)
1621                         break;
1622         }
1623
1624         /* Unmask the event */
1625         if (ret == EEH_NEXT_ERR_NONE && eeh_enabled())
1626                 enable_irq(eeh_event_irq);
1627
1628         return ret;
1629 }
1630
1631 static int pnv_eeh_restore_vf_config(struct pci_dn *pdn)
1632 {
1633         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
1634         u32 devctl, cmd, cap2, aer_capctl;
1635         int old_mps;
1636
1637         if (edev->pcie_cap) {
1638                 /* Restore MPS */
1639                 old_mps = (ffs(pdn->mps) - 8) << 5;
1640                 eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
1641                                      2, &devctl);
1642                 devctl &= ~PCI_EXP_DEVCTL_PAYLOAD;
1643                 devctl |= old_mps;
1644                 eeh_ops->write_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
1645                                       2, devctl);
1646
1647                 /* Disable Completion Timeout */
1648                 eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCAP2,
1649                                      4, &cap2);
1650                 if (cap2 & 0x10) {
1651                         eeh_ops->read_config(pdn,
1652                                              edev->pcie_cap + PCI_EXP_DEVCTL2,
1653                                              4, &cap2);
1654                         cap2 |= 0x10;
1655                         eeh_ops->write_config(pdn,
1656                                               edev->pcie_cap + PCI_EXP_DEVCTL2,
1657                                               4, cap2);
1658                 }
1659         }
1660
1661         /* Enable SERR and parity checking */
1662         eeh_ops->read_config(pdn, PCI_COMMAND, 2, &cmd);
1663         cmd |= (PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
1664         eeh_ops->write_config(pdn, PCI_COMMAND, 2, cmd);
1665
1666         /* Enable report various errors */
1667         if (edev->pcie_cap) {
1668                 eeh_ops->read_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
1669                                      2, &devctl);
1670                 devctl &= ~PCI_EXP_DEVCTL_CERE;
1671                 devctl |= (PCI_EXP_DEVCTL_NFERE |
1672                            PCI_EXP_DEVCTL_FERE |
1673                            PCI_EXP_DEVCTL_URRE);
1674                 eeh_ops->write_config(pdn, edev->pcie_cap + PCI_EXP_DEVCTL,
1675                                       2, devctl);
1676         }
1677
1678         /* Enable ECRC generation and check */
1679         if (edev->pcie_cap && edev->aer_cap) {
1680                 eeh_ops->read_config(pdn, edev->aer_cap + PCI_ERR_CAP,
1681                                      4, &aer_capctl);
1682                 aer_capctl |= (PCI_ERR_CAP_ECRC_GENE | PCI_ERR_CAP_ECRC_CHKE);
1683                 eeh_ops->write_config(pdn, edev->aer_cap + PCI_ERR_CAP,
1684                                       4, aer_capctl);
1685         }
1686
1687         return 0;
1688 }
1689
1690 static int pnv_eeh_restore_config(struct pci_dn *pdn)
1691 {
1692         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
1693         struct pnv_phb *phb;
1694         s64 ret;
1695
1696         if (!edev)
1697                 return -EEXIST;
1698
1699         /*
1700          * We have to restore the PCI config space after reset since the
1701          * firmware can't see SRIOV VFs.
1702          *
1703          * FIXME: The MPS, error routing rules, timeout setting are worthy
1704          * to be exported by firmware in extendible way.
1705          */
1706         if (edev->physfn) {
1707                 ret = pnv_eeh_restore_vf_config(pdn);
1708         } else {
1709                 phb = edev->phb->private_data;
1710                 ret = opal_pci_reinit(phb->opal_id,
1711                                       OPAL_REINIT_PCI_DEV, edev->config_addr);
1712         }
1713
1714         if (ret) {
1715                 pr_warn("%s: Can't reinit PCI dev 0x%x (%lld)\n",
1716                         __func__, edev->config_addr, ret);
1717                 return -EIO;
1718         }
1719
1720         return 0;
1721 }
1722
1723 static struct eeh_ops pnv_eeh_ops = {
1724         .name                   = "powernv",
1725         .init                   = pnv_eeh_init,
1726         .post_init              = pnv_eeh_post_init,
1727         .probe                  = pnv_eeh_probe,
1728         .set_option             = pnv_eeh_set_option,
1729         .get_pe_addr            = pnv_eeh_get_pe_addr,
1730         .get_state              = pnv_eeh_get_state,
1731         .reset                  = pnv_eeh_reset,
1732         .wait_state             = pnv_eeh_wait_state,
1733         .get_log                = pnv_eeh_get_log,
1734         .configure_bridge       = pnv_eeh_configure_bridge,
1735         .err_inject             = pnv_eeh_err_inject,
1736         .read_config            = pnv_eeh_read_config,
1737         .write_config           = pnv_eeh_write_config,
1738         .next_error             = pnv_eeh_next_error,
1739         .restore_config         = pnv_eeh_restore_config
1740 };
1741
1742 void pcibios_bus_add_device(struct pci_dev *pdev)
1743 {
1744         struct pci_dn *pdn = pci_get_pdn(pdev);
1745
1746         if (!pdev->is_virtfn)
1747                 return;
1748
1749         /*
1750          * The following operations will fail if VF's sysfs files
1751          * aren't created or its resources aren't finalized.
1752          */
1753         eeh_add_device_early(pdn);
1754         eeh_add_device_late(pdev);
1755         eeh_sysfs_add_device(pdev);
1756 }
1757
1758 #ifdef CONFIG_PCI_IOV
1759 static void pnv_pci_fixup_vf_mps(struct pci_dev *pdev)
1760 {
1761         struct pci_dn *pdn = pci_get_pdn(pdev);
1762         int parent_mps;
1763
1764         if (!pdev->is_virtfn)
1765                 return;
1766
1767         /* Synchronize MPS for VF and PF */
1768         parent_mps = pcie_get_mps(pdev->physfn);
1769         if ((128 << pdev->pcie_mpss) >= parent_mps)
1770                 pcie_set_mps(pdev, parent_mps);
1771         pdn->mps = pcie_get_mps(pdev);
1772 }
1773 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pnv_pci_fixup_vf_mps);
1774 #endif /* CONFIG_PCI_IOV */
1775
1776 /**
1777  * eeh_powernv_init - Register platform dependent EEH operations
1778  *
1779  * EEH initialization on powernv platform. This function should be
1780  * called before any EEH related functions.
1781  */
1782 static int __init eeh_powernv_init(void)
1783 {
1784         int ret = -EINVAL;
1785
1786         eeh_set_pe_aux_size(PNV_PCI_DIAG_BUF_SIZE);
1787         ret = eeh_ops_register(&pnv_eeh_ops);
1788         if (!ret)
1789                 pr_info("EEH: PowerNV platform initialized\n");
1790         else
1791                 pr_info("EEH: Failed to initialize PowerNV platform (%d)\n", ret);
1792
1793         return ret;
1794 }
1795 machine_early_initcall(powernv, eeh_powernv_init);