arch/powerpc/platforms/pseries/eeh_pseries.c

   1 /*
   2  * The file intends to implement the platform dependent EEH operations on pseries.
   3  * Actually, the pseries platform is built based on RTAS heavily. That means the
   4  * pseries platform dependent EEH operations will be built on RTAS calls. The functions
   5  * are devired from arch/powerpc/platforms/pseries/eeh.c and necessary cleanup has
   6  * been done.
   7  *
   8  * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2011.
   9  * Copyright IBM Corporation 2001, 2005, 2006
  10  * Copyright Dave Engebretsen & Todd Inglett 2001
  11  * Copyright Linas Vepstas 2005, 2006
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  26  */
  27
  28 #include <linux/atomic.h>
  29 #include <linux/delay.h>
  30 #include <linux/export.h>
  31 #include <linux/init.h>
  32 #include <linux/list.h>
  33 #include <linux/of.h>
  34 #include <linux/pci.h>
  35 #include <linux/proc_fs.h>
  36 #include <linux/rbtree.h>
  37 #include <linux/sched.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/spinlock.h>
  40
  41 #include <asm/eeh.h>
  42 #include <asm/eeh_event.h>
  43 #include <asm/io.h>
  44 #include <asm/machdep.h>
  45 #include <asm/ppc-pci.h>
  46 #include <asm/rtas.h>
  47
  48 /* RTAS tokens */
  49 static int ibm_set_eeh_option;
  50 static int ibm_set_slot_reset;
  51 static int ibm_read_slot_reset_state;
  52 static int ibm_read_slot_reset_state2;
  53 static int ibm_slot_error_detail;
  54 static int ibm_get_config_addr_info;
  55 static int ibm_get_config_addr_info2;
  56 static int ibm_configure_bridge;
  57 static int ibm_configure_pe;
  58
  59 /*
  60  * Buffer for reporting slot-error-detail rtas calls. Its here
  61  * in BSS, and not dynamically alloced, so that it ends up in
  62  * RMO where RTAS can access it.
  63  */
  64 static unsigned char slot_errbuf[RTAS_ERROR_LOG_MAX];
  65 static DEFINE_SPINLOCK(slot_errbuf_lock);
  66 static int eeh_error_buf_size;
  67
  68 /**
  69  * pseries_eeh_init - EEH platform dependent initialization
  70  *
  71  * EEH platform dependent initialization on pseries.
  72  */
  73 static int pseries_eeh_init(void)
  74 {
  75         /* figure out EEH RTAS function call tokens */
  76         ibm_set_eeh_option              = rtas_token("ibm,set-eeh-option");
  77         ibm_set_slot_reset              = rtas_token("ibm,set-slot-reset");
  78         ibm_read_slot_reset_state2      = rtas_token("ibm,read-slot-reset-state2");
  79         ibm_read_slot_reset_state       = rtas_token("ibm,read-slot-reset-state");
  80         ibm_slot_error_detail           = rtas_token("ibm,slot-error-detail");
  81         ibm_get_config_addr_info2       = rtas_token("ibm,get-config-addr-info2");
  82         ibm_get_config_addr_info        = rtas_token("ibm,get-config-addr-info");
  83         ibm_configure_pe                = rtas_token("ibm,configure-pe");
  84         ibm_configure_bridge            = rtas_token("ibm,configure-bridge");
  85
  86         /*
  87          * Necessary sanity check. We needn't check "get-config-addr-info"
  88          * and its variant since the old firmware probably support address
  89          * of domain/bus/slot/function for EEH RTAS operations.
  90          */
  91         if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE          ||
  92             ibm_set_slot_reset == RTAS_UNKNOWN_SERVICE          ||
  93             (ibm_read_slot_reset_state2 == RTAS_UNKNOWN_SERVICE &&
  94              ibm_read_slot_reset_state == RTAS_UNKNOWN_SERVICE) ||
  95             ibm_slot_error_detail == RTAS_UNKNOWN_SERVICE       ||
  96             (ibm_configure_pe == RTAS_UNKNOWN_SERVICE           &&
  97              ibm_configure_bridge == RTAS_UNKNOWN_SERVICE)) {
  98                 pr_info("EEH functionality not supported\n");
  99                 return -EINVAL;
 100         }
 101
 102         /* Initialize error log lock and size */
 103         spin_lock_init(&slot_errbuf_lock);
 104         eeh_error_buf_size = rtas_token("rtas-error-log-max");
 105         if (eeh_error_buf_size == RTAS_UNKNOWN_SERVICE) {
 106                 pr_info("%s: unknown EEH error log size\n",
 107                         __func__);
 108                 eeh_error_buf_size = 1024;
 109         } else if (eeh_error_buf_size > RTAS_ERROR_LOG_MAX) {
 110                 pr_info("%s: EEH error log size %d exceeds the maximal %d\n",
 111                         __func__, eeh_error_buf_size, RTAS_ERROR_LOG_MAX);
 112                 eeh_error_buf_size = RTAS_ERROR_LOG_MAX;
 113         }
 114
 115         /* Set EEH probe mode */
 116         eeh_add_flag(EEH_PROBE_MODE_DEVTREE | EEH_ENABLE_IO_FOR_LOG);
 117
 118         return 0;
 119 }
 120
 121 static int pseries_eeh_cap_start(struct pci_dn *pdn)
 122 {
 123         u32 status;
 124
 125         if (!pdn)
 126                 return 0;
 127
 128         rtas_read_config(pdn, PCI_STATUS, 2, &status);
 129         if (!(status & PCI_STATUS_CAP_LIST))
 130                 return 0;
 131
 132         return PCI_CAPABILITY_LIST;
 133 }
 134
 135
 136 static int pseries_eeh_find_cap(struct pci_dn *pdn, int cap)
 137 {
 138         int pos = pseries_eeh_cap_start(pdn);
 139         int cnt = 48;   /* Maximal number of capabilities */
 140         u32 id;
 141
 142         if (!pos)
 143                 return 0;
 144
 145         while (cnt--) {
 146                 rtas_read_config(pdn, pos, 1, &pos);
 147                 if (pos < 0x40)
 148                         break;
 149                 pos &= ~3;
 150                 rtas_read_config(pdn, pos + PCI_CAP_LIST_ID, 1, &id);
 151                 if (id == 0xff)
 152                         break;
 153                 if (id == cap)
 154                         return pos;
 155                 pos += PCI_CAP_LIST_NEXT;
 156         }
 157
 158         return 0;
 159 }
 160
 161 static int pseries_eeh_find_ecap(struct pci_dn *pdn, int cap)
 162 {
 163         struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
 164         u32 header;
 165         int pos = 256;
 166         int ttl = (4096 - 256) / 8;
 167
 168         if (!edev || !edev->pcie_cap)
 169                 return 0;
 170         if (rtas_read_config(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
 171                 return 0;
 172         else if (!header)
 173                 return 0;
 174
 175         while (ttl-- > 0) {
 176                 if (PCI_EXT_CAP_ID(header) == cap && pos)
 177                         return pos;
 178
 179                 pos = PCI_EXT_CAP_NEXT(header);
 180                 if (pos < 256)
 181                         break;
 182
 183                 if (rtas_read_config(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
 184                         break;
 185         }
 186
 187         return 0;
 188 }
 189
 190 /**
 191  * pseries_eeh_probe - EEH probe on the given device
 192  * @pdn: PCI device node
 193  * @data: Unused
 194  *
 195  * When EEH module is installed during system boot, all PCI devices
 196  * are checked one by one to see if it supports EEH. The function
 197  * is introduced for the purpose.
 198  */
 199 static void *pseries_eeh_probe(struct pci_dn *pdn, void *data)
 200 {
 201         struct eeh_dev *edev;
 202         struct eeh_pe pe;
 203         u32 pcie_flags;
 204         int enable = 0;
 205         int ret;
 206
 207         /* Retrieve OF node and eeh device */
 208         edev = pdn_to_eeh_dev(pdn);
 209         if (!edev || edev->pe)
 210                 return NULL;
 211
 212         /* Check class/vendor/device IDs */
 213         if (!pdn->vendor_id || !pdn->device_id || !pdn->class_code)
 214                 return NULL;
 215
 216         /* Skip for PCI-ISA bridge */
 217         if ((pdn->class_code >> 8) == PCI_CLASS_BRIDGE_ISA)
 218                 return NULL;
 219
 220         /*
 221          * Update class code and mode of eeh device. We need
 222          * correctly reflects that current device is root port
 223          * or PCIe switch downstream port.
 224          */
 225         edev->class_code = pdn->class_code;
 226         edev->pcix_cap = pseries_eeh_find_cap(pdn, PCI_CAP_ID_PCIX);
 227         edev->pcie_cap = pseries_eeh_find_cap(pdn, PCI_CAP_ID_EXP);
 228         edev->aer_cap = pseries_eeh_find_ecap(pdn, PCI_EXT_CAP_ID_ERR);
 229         edev->mode &= 0xFFFFFF00;
 230         if ((edev->class_code >> 8) == PCI_CLASS_BRIDGE_PCI) {
 231                 edev->mode |= EEH_DEV_BRIDGE;
 232                 if (edev->pcie_cap) {
 233                         rtas_read_config(pdn, edev->pcie_cap + PCI_EXP_FLAGS,
 234                                          2, &pcie_flags);
 235                         pcie_flags = (pcie_flags & PCI_EXP_FLAGS_TYPE) >> 4;
 236                         if (pcie_flags == PCI_EXP_TYPE_ROOT_PORT)
 237                                 edev->mode |= EEH_DEV_ROOT_PORT;
 238                         else if (pcie_flags == PCI_EXP_TYPE_DOWNSTREAM)
 239                                 edev->mode |= EEH_DEV_DS_PORT;
 240                 }
 241         }
 242
 243         /* Initialize the fake PE */
 244         memset(&pe, 0, sizeof(struct eeh_pe));
 245         pe.phb = edev->phb;
 246         pe.config_addr = (pdn->busno << 16) | (pdn->devfn << 8);
 247
 248         /* Enable EEH on the device */
 249         ret = eeh_ops->set_option(&pe, EEH_OPT_ENABLE);
 250         if (!ret) {
 251                 /* Retrieve PE address */
 252                 edev->config_addr = (pdn->busno << 16) | (pdn->devfn << 8);
 253                 edev->pe_config_addr = eeh_ops->get_pe_addr(&pe);
 254                 pe.addr = edev->pe_config_addr;
 255
 256                 /* Some older systems (Power4) allow the ibm,set-eeh-option
 257                  * call to succeed even on nodes where EEH is not supported.
 258                  * Verify support explicitly.
 259                  */
 260                 ret = eeh_ops->get_state(&pe, NULL);
 261                 if (ret > 0 && ret != EEH_STATE_NOT_SUPPORT)
 262                         enable = 1;
 263
 264                 if (enable) {
 265                         eeh_add_flag(EEH_ENABLED);
 266                         eeh_add_to_parent_pe(edev);
 267
 268                         pr_debug("%s: EEH enabled on %02x:%02x.%01x PHB#%d-PE#%x\n",
 269                                 __func__, pdn->busno, PCI_SLOT(pdn->devfn),
 270                                 PCI_FUNC(pdn->devfn), pe.phb->global_number,
 271                                 pe.addr);
 272                 } else if (pdn->parent && pdn_to_eeh_dev(pdn->parent) &&
 273                            (pdn_to_eeh_dev(pdn->parent))->pe) {
 274                         /* This device doesn't support EEH, but it may have an
 275                          * EEH parent, in which case we mark it as supported.
 276                          */
 277                         edev->config_addr = pdn_to_eeh_dev(pdn->parent)->config_addr;
 278                         edev->pe_config_addr = pdn_to_eeh_dev(pdn->parent)->pe_config_addr;
 279                         eeh_add_to_parent_pe(edev);
 280                 }
 281         }
 282
 283         /* Save memory bars */
 284         eeh_save_bars(edev);
 285
 286         return NULL;
 287 }
 288
 289 /**
 290  * pseries_eeh_set_option - Initialize EEH or MMIO/DMA reenable
 291  * @pe: EEH PE
 292  * @option: operation to be issued
 293  *
 294  * The function is used to control the EEH functionality globally.
 295  * Currently, following options are support according to PAPR:
 296  * Enable EEH, Disable EEH, Enable MMIO and Enable DMA
 297  */
 298 static int pseries_eeh_set_option(struct eeh_pe *pe, int option)
 299 {
 300         int ret = 0;
 301         int config_addr;
 302
 303         /*
 304          * When we're enabling or disabling EEH functioality on
 305          * the particular PE, the PE config address is possibly
 306          * unavailable. Therefore, we have to figure it out from
 307          * the FDT node.
 308          */
 309         switch (option) {
 310         case EEH_OPT_DISABLE:
 311         case EEH_OPT_ENABLE:
 312         case EEH_OPT_THAW_MMIO:
 313         case EEH_OPT_THAW_DMA:
 314                 config_addr = pe->config_addr;
 315                 if (pe->addr)
 316                         config_addr = pe->addr;
 317                 break;
 318         case EEH_OPT_FREEZE_PE:
 319                 /* Not support */
 320                 return 0;
 321         default:
 322                 pr_err("%s: Invalid option %d\n",
 323                         __func__, option);
 324                 return -EINVAL;
 325         }
 326
 327         ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL,
 328                         config_addr, BUID_HI(pe->phb->buid),
 329                         BUID_LO(pe->phb->buid), option);
 330
 331         return ret;
 332 }
 333
 334 /**
 335  * pseries_eeh_get_pe_addr - Retrieve PE address
 336  * @pe: EEH PE
 337  *
 338  * Retrieve the assocated PE address. Actually, there're 2 RTAS
 339  * function calls dedicated for the purpose. We need implement
 340  * it through the new function and then the old one. Besides,
 341  * you should make sure the config address is figured out from
 342  * FDT node before calling the function.
 343  *
 344  * It's notable that zero'ed return value means invalid PE config
 345  * address.
 346  */
 347 static int pseries_eeh_get_pe_addr(struct eeh_pe *pe)
 348 {
 349         int ret = 0;
 350         int rets[3];
 351
 352         if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) {
 353                 /*
 354                  * First of all, we need to make sure there has one PE
 355                  * associated with the device. Otherwise, PE address is
 356                  * meaningless.
 357                  */
 358                 ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
 359                                 pe->config_addr, BUID_HI(pe->phb->buid),
 360                                 BUID_LO(pe->phb->buid), 1);
 361                 if (ret || (rets[0] == 0))
 362                         return 0;
 363
 364                 /* Retrieve the associated PE config address */
 365                 ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
 366                                 pe->config_addr, BUID_HI(pe->phb->buid),
 367                                 BUID_LO(pe->phb->buid), 0);
 368                 if (ret) {
 369                         pr_warn("%s: Failed to get address for PHB#%d-PE#%x\n",
 370                                 __func__, pe->phb->global_number, pe->config_addr);
 371                         return 0;
 372                 }
 373
 374                 return rets[0];
 375         }
 376
 377         if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) {
 378                 ret = rtas_call(ibm_get_config_addr_info, 4, 2, rets,
 379                                 pe->config_addr, BUID_HI(pe->phb->buid),
 380                                 BUID_LO(pe->phb->buid), 0);
 381                 if (ret) {
 382                         pr_warn("%s: Failed to get address for PHB#%d-PE#%x\n",
 383                                 __func__, pe->phb->global_number, pe->config_addr);
 384                         return 0;
 385                 }
 386
 387                 return rets[0];
 388         }
 389
 390         return ret;
 391 }
 392
 393 /**
 394  * pseries_eeh_get_state - Retrieve PE state
 395  * @pe: EEH PE
 396  * @state: return value
 397  *
 398  * Retrieve the state of the specified PE. On RTAS compliant
 399  * pseries platform, there already has one dedicated RTAS function
 400  * for the purpose. It's notable that the associated PE config address
 401  * might be ready when calling the function. Therefore, endeavour to
 402  * use the PE config address if possible. Further more, there're 2
 403  * RTAS calls for the purpose, we need to try the new one and back
 404  * to the old one if the new one couldn't work properly.
 405  */
 406 static int pseries_eeh_get_state(struct eeh_pe *pe, int *state)
 407 {
 408         int config_addr;
 409         int ret;
 410         int rets[4];
 411         int result;
 412
 413         /* Figure out PE config address if possible */
 414         config_addr = pe->config_addr;
 415         if (pe->addr)
 416                 config_addr = pe->addr;
 417
 418         if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) {
 419                 ret = rtas_call(ibm_read_slot_reset_state2, 3, 4, rets,
 420                                 config_addr, BUID_HI(pe->phb->buid),
 421                                 BUID_LO(pe->phb->buid));
 422         } else if (ibm_read_slot_reset_state != RTAS_UNKNOWN_SERVICE) {
 423                 /* Fake PE unavailable info */
 424                 rets[2] = 0;
 425                 ret = rtas_call(ibm_read_slot_reset_state, 3, 3, rets,
 426                                 config_addr, BUID_HI(pe->phb->buid),
 427                                 BUID_LO(pe->phb->buid));
 428         } else {
 429                 return EEH_STATE_NOT_SUPPORT;
 430         }
 431
 432         if (ret)
 433                 return ret;
 434
 435         /* Parse the result out */
 436         result = 0;
 437         if (rets[1]) {
 438                 switch(rets[0]) {
 439                 case 0:
 440                         result &= ~EEH_STATE_RESET_ACTIVE;
 441                         result |= EEH_STATE_MMIO_ACTIVE;
 442                         result |= EEH_STATE_DMA_ACTIVE;
 443                         break;
 444                 case 1:
 445                         result |= EEH_STATE_RESET_ACTIVE;
 446                         result |= EEH_STATE_MMIO_ACTIVE;
 447                         result |= EEH_STATE_DMA_ACTIVE;
 448                         break;
 449                 case 2:
 450                         result &= ~EEH_STATE_RESET_ACTIVE;
 451                         result &= ~EEH_STATE_MMIO_ACTIVE;
 452                         result &= ~EEH_STATE_DMA_ACTIVE;
 453                         break;
 454                 case 4:
 455                         result &= ~EEH_STATE_RESET_ACTIVE;
 456                         result &= ~EEH_STATE_MMIO_ACTIVE;
 457                         result &= ~EEH_STATE_DMA_ACTIVE;
 458                         result |= EEH_STATE_MMIO_ENABLED;
 459                         break;
 460                 case 5:
 461                         if (rets[2]) {
 462                                 if (state) *state = rets[2];
 463                                 result = EEH_STATE_UNAVAILABLE;
 464                         } else {
 465                                 result = EEH_STATE_NOT_SUPPORT;
 466                         }
 467                         break;
 468                 default:
 469                         result = EEH_STATE_NOT_SUPPORT;
 470                 }
 471         } else {
 472                 result = EEH_STATE_NOT_SUPPORT;
 473         }
 474
 475         return result;
 476 }
 477
 478 /**
 479  * pseries_eeh_reset - Reset the specified PE
 480  * @pe: EEH PE
 481  * @option: reset option
 482  *
 483  * Reset the specified PE
 484  */
 485 static int pseries_eeh_reset(struct eeh_pe *pe, int option)
 486 {
 487         int config_addr;
 488         int ret;
 489
 490         /* Figure out PE address */
 491         config_addr = pe->config_addr;
 492         if (pe->addr)
 493                 config_addr = pe->addr;
 494
 495         /* Reset PE through RTAS call */
 496         ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL,
 497                         config_addr, BUID_HI(pe->phb->buid),
 498                         BUID_LO(pe->phb->buid), option);
 499
 500         /* If fundamental-reset not supported, try hot-reset */
 501         if (option == EEH_RESET_FUNDAMENTAL &&
 502             ret == -8) {
 503                 option = EEH_RESET_HOT;
 504                 ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL,
 505                                 config_addr, BUID_HI(pe->phb->buid),
 506                                 BUID_LO(pe->phb->buid), option);
 507         }
 508
 509         /* We need reset hold or settlement delay */
 510         if (option == EEH_RESET_FUNDAMENTAL ||
 511             option == EEH_RESET_HOT)
 512                 msleep(EEH_PE_RST_HOLD_TIME);
 513         else
 514                 msleep(EEH_PE_RST_SETTLE_TIME);
 515
 516         return ret;
 517 }
 518
 519 /**
 520  * pseries_eeh_wait_state - Wait for PE state
 521  * @pe: EEH PE
 522  * @max_wait: maximal period in microsecond
 523  *
 524  * Wait for the state of associated PE. It might take some time
 525  * to retrieve the PE's state.
 526  */
 527 static int pseries_eeh_wait_state(struct eeh_pe *pe, int max_wait)
 528 {
 529         int ret;
 530         int mwait;
 531
 532         /*
 533          * According to PAPR, the state of PE might be temporarily
 534          * unavailable. Under the circumstance, we have to wait
 535          * for indicated time determined by firmware. The maximal
 536          * wait time is 5 minutes, which is acquired from the original
 537          * EEH implementation. Also, the original implementation
 538          * also defined the minimal wait time as 1 second.
 539          */
 540 #define EEH_STATE_MIN_WAIT_TIME (1000)
 541 #define EEH_STATE_MAX_WAIT_TIME (300 * 1000)
 542
 543         while (1) {
 544                 ret = pseries_eeh_get_state(pe, &mwait);
 545
 546                 /*
 547                  * If the PE's state is temporarily unavailable,
 548                  * we have to wait for the specified time. Otherwise,
 549                  * the PE's state will be returned immediately.
 550                  */
 551                 if (ret != EEH_STATE_UNAVAILABLE)
 552                         return ret;
 553
 554                 if (max_wait <= 0) {
 555                         pr_warn("%s: Timeout when getting PE's state (%d)\n",
 556                                 __func__, max_wait);
 557                         return EEH_STATE_NOT_SUPPORT;
 558                 }
 559
 560                 if (mwait <= 0) {
 561                         pr_warn("%s: Firmware returned bad wait value %d\n",
 562                                 __func__, mwait);
 563                         mwait = EEH_STATE_MIN_WAIT_TIME;
 564                 } else if (mwait > EEH_STATE_MAX_WAIT_TIME) {
 565                         pr_warn("%s: Firmware returned too long wait value %d\n",
 566                                 __func__, mwait);
 567                         mwait = EEH_STATE_MAX_WAIT_TIME;
 568                 }
 569
 570                 max_wait -= mwait;
 571                 msleep(mwait);
 572         }
 573
 574         return EEH_STATE_NOT_SUPPORT;
 575 }
 576
 577 /**
 578  * pseries_eeh_get_log - Retrieve error log
 579  * @pe: EEH PE
 580  * @severity: temporary or permanent error log
 581  * @drv_log: driver log to be combined with retrieved error log
 582  * @len: length of driver log
 583  *
 584  * Retrieve the temporary or permanent error from the PE.
 585  * Actually, the error will be retrieved through the dedicated
 586  * RTAS call.
 587  */
 588 static int pseries_eeh_get_log(struct eeh_pe *pe, int severity, char *drv_log, unsigned long len)
 589 {
 590         int config_addr;
 591         unsigned long flags;
 592         int ret;
 593
 594         spin_lock_irqsave(&slot_errbuf_lock, flags);
 595         memset(slot_errbuf, 0, eeh_error_buf_size);
 596
 597         /* Figure out the PE address */
 598         config_addr = pe->config_addr;
 599         if (pe->addr)
 600                 config_addr = pe->addr;
 601
 602         ret = rtas_call(ibm_slot_error_detail, 8, 1, NULL, config_addr,
 603                         BUID_HI(pe->phb->buid), BUID_LO(pe->phb->buid),
 604                         virt_to_phys(drv_log), len,
 605                         virt_to_phys(slot_errbuf), eeh_error_buf_size,
 606                         severity);
 607         if (!ret)
 608                 log_error(slot_errbuf, ERR_TYPE_RTAS_LOG, 0);
 609         spin_unlock_irqrestore(&slot_errbuf_lock, flags);
 610
 611         return ret;
 612 }
 613
 614 /**
 615  * pseries_eeh_configure_bridge - Configure PCI bridges in the indicated PE
 616  * @pe: EEH PE
 617  *
 618  * The function will be called to reconfigure the bridges included
 619  * in the specified PE so that the mulfunctional PE would be recovered
 620  * again.
 621  */
 622 static int pseries_eeh_configure_bridge(struct eeh_pe *pe)
 623 {
 624         int config_addr;
 625         int ret;
 626
 627         /* Figure out the PE address */
 628         config_addr = pe->config_addr;
 629         if (pe->addr)
 630                 config_addr = pe->addr;
 631
 632         /* Use new configure-pe function, if supported */
 633         if (ibm_configure_pe != RTAS_UNKNOWN_SERVICE) {
 634                 ret = rtas_call(ibm_configure_pe, 3, 1, NULL,
 635                                 config_addr, BUID_HI(pe->phb->buid),
 636                                 BUID_LO(pe->phb->buid));
 637         } else if (ibm_configure_bridge != RTAS_UNKNOWN_SERVICE) {
 638                 ret = rtas_call(ibm_configure_bridge, 3, 1, NULL,
 639                                 config_addr, BUID_HI(pe->phb->buid),
 640                                 BUID_LO(pe->phb->buid));
 641         } else {
 642                 return -EFAULT;
 643         }
 644
 645         if (ret)
 646                 pr_warn("%s: Unable to configure bridge PHB#%d-PE#%x (%d)\n",
 647                         __func__, pe->phb->global_number, pe->addr, ret);
 648
 649         return ret;
 650 }
 651
 652 /**
 653  * pseries_eeh_read_config - Read PCI config space
 654  * @pdn: PCI device node
 655  * @where: PCI address
 656  * @size: size to read
 657  * @val: return value
 658  *
 659  * Read config space from the speicifed device
 660  */
 661 static int pseries_eeh_read_config(struct pci_dn *pdn, int where, int size, u32 *val)
 662 {
 663         return rtas_read_config(pdn, where, size, val);
 664 }
 665
 666 /**
 667  * pseries_eeh_write_config - Write PCI config space
 668  * @pdn: PCI device node
 669  * @where: PCI address
 670  * @size: size to write
 671  * @val: value to be written
 672  *
 673  * Write config space to the specified device
 674  */
 675 static int pseries_eeh_write_config(struct pci_dn *pdn, int where, int size, u32 val)
 676 {
 677         return rtas_write_config(pdn, where, size, val);
 678 }
 679
 680 static struct eeh_ops pseries_eeh_ops = {
 681         .name                   = "pseries",
 682         .init                   = pseries_eeh_init,
 683         .probe                  = pseries_eeh_probe,
 684         .set_option             = pseries_eeh_set_option,
 685         .get_pe_addr            = pseries_eeh_get_pe_addr,
 686         .get_state              = pseries_eeh_get_state,
 687         .reset                  = pseries_eeh_reset,
 688         .wait_state             = pseries_eeh_wait_state,
 689         .get_log                = pseries_eeh_get_log,
 690         .configure_bridge       = pseries_eeh_configure_bridge,
 691         .err_inject             = NULL,
 692         .read_config            = pseries_eeh_read_config,
 693         .write_config           = pseries_eeh_write_config,
 694         .next_error             = NULL,
 695         .restore_config         = NULL
 696 };
 697
 698 /**
 699  * eeh_pseries_init - Register platform dependent EEH operations
 700  *
 701  * EEH initialization on pseries platform. This function should be
 702  * called before any EEH related functions.
 703  */
 704 static int __init eeh_pseries_init(void)
 705 {
 706         int ret;
 707
 708         ret = eeh_ops_register(&pseries_eeh_ops);
 709         if (!ret)
 710                 pr_info("EEH: pSeries platform initialized\n");
 711         else
 712                 pr_info("EEH: pSeries platform initialization failure (%d)\n",
 713                         ret);
 714
 715         return ret;
 716 }
 717 machine_early_initcall(pseries, eeh_pseries_init);