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                 pr_warning("%s: RTAS service <ibm,set-eeh-option> invalid\n",
  93                         __func__);
  94                 return -EINVAL;
  95         } else if (ibm_set_slot_reset == RTAS_UNKNOWN_SERVICE) {
  96                 pr_warning("%s: RTAS service <ibm,set-slot-reset> invalid\n",
  97                         __func__);
  98                 return -EINVAL;
  99         } else if (ibm_read_slot_reset_state2 == RTAS_UNKNOWN_SERVICE &&
 100                    ibm_read_slot_reset_state == RTAS_UNKNOWN_SERVICE) {
 101                 pr_warning("%s: RTAS service <ibm,read-slot-reset-state2> and "
 102                         "<ibm,read-slot-reset-state> invalid\n",
 103                         __func__);
 104                 return -EINVAL;
 105         } else if (ibm_slot_error_detail == RTAS_UNKNOWN_SERVICE) {
 106                 pr_warning("%s: RTAS service <ibm,slot-error-detail> invalid\n",
 107                         __func__);
 108                 return -EINVAL;
 109         } else if (ibm_configure_pe == RTAS_UNKNOWN_SERVICE &&
 110                    ibm_configure_bridge == RTAS_UNKNOWN_SERVICE) {
 111                 pr_warning("%s: RTAS service <ibm,configure-pe> and "
 112                         "<ibm,configure-bridge> invalid\n",
 113                         __func__);
 114                 return -EINVAL;
 115         }
 116
 117         /* Initialize error log lock and size */
 118         spin_lock_init(&slot_errbuf_lock);
 119         eeh_error_buf_size = rtas_token("rtas-error-log-max");
 120         if (eeh_error_buf_size == RTAS_UNKNOWN_SERVICE) {
 121                 pr_warning("%s: unknown EEH error log size\n",
 122                         __func__);
 123                 eeh_error_buf_size = 1024;
 124         } else if (eeh_error_buf_size > RTAS_ERROR_LOG_MAX) {
 125                 pr_warning("%s: EEH error log size %d exceeds the maximal %d\n",
 126                         __func__, eeh_error_buf_size, RTAS_ERROR_LOG_MAX);
 127                 eeh_error_buf_size = RTAS_ERROR_LOG_MAX;
 128         }
 129
 130         /* Set EEH probe mode */
 131         eeh_probe_mode_set(EEH_PROBE_MODE_DEVTREE);
 132
 133         return 0;
 134 }
 135
 136 /**
 137  * pseries_eeh_of_probe - EEH probe on the given device
 138  * @dn: OF node
 139  * @flag: Unused
 140  *
 141  * When EEH module is installed during system boot, all PCI devices
 142  * are checked one by one to see if it supports EEH. The function
 143  * is introduced for the purpose.
 144  */
 145 static void *pseries_eeh_of_probe(struct device_node *dn, void *flag)
 146 {
 147         struct eeh_dev *edev;
 148         struct eeh_pe pe;
 149         const u32 *class_code, *vendor_id, *device_id;
 150         const u32 *regs;
 151         int enable = 0;
 152         int ret;
 153
 154         /* Retrieve OF node and eeh device */
 155         edev = of_node_to_eeh_dev(dn);
 156         if (!of_device_is_available(dn))
 157                 return NULL;
 158
 159         /* Retrieve class/vendor/device IDs */
 160         class_code = of_get_property(dn, "class-code", NULL);
 161         vendor_id  = of_get_property(dn, "vendor-id", NULL);
 162         device_id  = of_get_property(dn, "device-id", NULL);
 163
 164         /* Skip for bad OF node or PCI-ISA bridge */
 165         if (!class_code || !vendor_id || !device_id)
 166                 return NULL;
 167         if (dn->type && !strcmp(dn->type, "isa"))
 168                 return NULL;
 169
 170         /* Update class code and mode of eeh device */
 171         edev->class_code = *class_code;
 172         edev->mode = 0;
 173
 174         /* Retrieve the device address */
 175         regs = of_get_property(dn, "reg", NULL);
 176         if (!regs) {
 177                 pr_warning("%s: OF node property %s::reg not found\n",
 178                         __func__, dn->full_name);
 179                 return NULL;
 180         }
 181
 182         /* Initialize the fake PE */
 183         memset(&pe, 0, sizeof(struct eeh_pe));
 184         pe.phb = edev->phb;
 185         pe.config_addr = regs[0];
 186
 187         /* Enable EEH on the device */
 188         ret = eeh_ops->set_option(&pe, EEH_OPT_ENABLE);
 189         if (!ret) {
 190                 edev->config_addr = regs[0];
 191                 /* Retrieve PE address */
 192                 edev->pe_config_addr = eeh_ops->get_pe_addr(&pe);
 193                 pe.addr = edev->pe_config_addr;
 194
 195                 /* Some older systems (Power4) allow the ibm,set-eeh-option
 196                  * call to succeed even on nodes where EEH is not supported.
 197                  * Verify support explicitly.
 198                  */
 199                 ret = eeh_ops->get_state(&pe, NULL);
 200                 if (ret > 0 && ret != EEH_STATE_NOT_SUPPORT)
 201                         enable = 1;
 202
 203                 if (enable) {
 204                         eeh_subsystem_enabled = 1;
 205                         eeh_add_to_parent_pe(edev);
 206
 207                         pr_debug("%s: EEH enabled on %s PHB#%d-PE#%x, config addr#%x\n",
 208                                 __func__, dn->full_name, pe.phb->global_number,
 209                                 pe.addr, pe.config_addr);
 210                 } else if (dn->parent && of_node_to_eeh_dev(dn->parent) &&
 211                            (of_node_to_eeh_dev(dn->parent))->pe) {
 212                         /* This device doesn't support EEH, but it may have an
 213                          * EEH parent, in which case we mark it as supported.
 214                          */
 215                         edev->config_addr = of_node_to_eeh_dev(dn->parent)->config_addr;
 216                         edev->pe_config_addr = of_node_to_eeh_dev(dn->parent)->pe_config_addr;
 217                         eeh_add_to_parent_pe(edev);
 218                 }
 219         }
 220
 221         /* Save memory bars */
 222         eeh_save_bars(edev);
 223
 224         return NULL;
 225 }
 226
 227 /**
 228  * pseries_eeh_set_option - Initialize EEH or MMIO/DMA reenable
 229  * @pe: EEH PE
 230  * @option: operation to be issued
 231  *
 232  * The function is used to control the EEH functionality globally.
 233  * Currently, following options are support according to PAPR:
 234  * Enable EEH, Disable EEH, Enable MMIO and Enable DMA
 235  */
 236 static int pseries_eeh_set_option(struct eeh_pe *pe, int option)
 237 {
 238         int ret = 0;
 239         int config_addr;
 240
 241         /*
 242          * When we're enabling or disabling EEH functioality on
 243          * the particular PE, the PE config address is possibly
 244          * unavailable. Therefore, we have to figure it out from
 245          * the FDT node.
 246          */
 247         switch (option) {
 248         case EEH_OPT_DISABLE:
 249         case EEH_OPT_ENABLE:
 250         case EEH_OPT_THAW_MMIO:
 251         case EEH_OPT_THAW_DMA:
 252                 config_addr = pe->config_addr;
 253                 if (pe->addr)
 254                         config_addr = pe->addr;
 255                 break;
 256
 257         default:
 258                 pr_err("%s: Invalid option %d\n",
 259                         __func__, option);
 260                 return -EINVAL;
 261         }
 262
 263         ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL,
 264                         config_addr, BUID_HI(pe->phb->buid),
 265                         BUID_LO(pe->phb->buid), option);
 266
 267         return ret;
 268 }
 269
 270 /**
 271  * pseries_eeh_get_pe_addr - Retrieve PE address
 272  * @pe: EEH PE
 273  *
 274  * Retrieve the assocated PE address. Actually, there're 2 RTAS
 275  * function calls dedicated for the purpose. We need implement
 276  * it through the new function and then the old one. Besides,
 277  * you should make sure the config address is figured out from
 278  * FDT node before calling the function.
 279  *
 280  * It's notable that zero'ed return value means invalid PE config
 281  * address.
 282  */
 283 static int pseries_eeh_get_pe_addr(struct eeh_pe *pe)
 284 {
 285         int ret = 0;
 286         int rets[3];
 287
 288         if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) {
 289                 /*
 290                  * First of all, we need to make sure there has one PE
 291                  * associated with the device. Otherwise, PE address is
 292                  * meaningless.
 293                  */
 294                 ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
 295                                 pe->config_addr, BUID_HI(pe->phb->buid),
 296                                 BUID_LO(pe->phb->buid), 1);
 297                 if (ret || (rets[0] == 0))
 298                         return 0;
 299
 300                 /* Retrieve the associated PE config address */
 301                 ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets,
 302                                 pe->config_addr, BUID_HI(pe->phb->buid),
 303                                 BUID_LO(pe->phb->buid), 0);
 304                 if (ret) {
 305                         pr_warning("%s: Failed to get address for PHB#%d-PE#%x\n",
 306                                 __func__, pe->phb->global_number, pe->config_addr);
 307                         return 0;
 308                 }
 309
 310                 return rets[0];
 311         }
 312
 313         if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) {
 314                 ret = rtas_call(ibm_get_config_addr_info, 4, 2, rets,
 315                                 pe->config_addr, BUID_HI(pe->phb->buid),
 316                                 BUID_LO(pe->phb->buid), 0);
 317                 if (ret) {
 318                         pr_warning("%s: Failed to get address for PHB#%d-PE#%x\n",
 319                                 __func__, pe->phb->global_number, pe->config_addr);
 320                         return 0;
 321                 }
 322
 323                 return rets[0];
 324         }
 325
 326         return ret;
 327 }
 328
 329 /**
 330  * pseries_eeh_get_state - Retrieve PE state
 331  * @pe: EEH PE
 332  * @state: return value
 333  *
 334  * Retrieve the state of the specified PE. On RTAS compliant
 335  * pseries platform, there already has one dedicated RTAS function
 336  * for the purpose. It's notable that the associated PE config address
 337  * might be ready when calling the function. Therefore, endeavour to
 338  * use the PE config address if possible. Further more, there're 2
 339  * RTAS calls for the purpose, we need to try the new one and back
 340  * to the old one if the new one couldn't work properly.
 341  */
 342 static int pseries_eeh_get_state(struct eeh_pe *pe, int *state)
 343 {
 344         int config_addr;
 345         int ret;
 346         int rets[4];
 347         int result;
 348
 349         /* Figure out PE config address if possible */
 350         config_addr = pe->config_addr;
 351         if (pe->addr)
 352                 config_addr = pe->addr;
 353
 354         if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) {
 355                 ret = rtas_call(ibm_read_slot_reset_state2, 3, 4, rets,
 356                                 config_addr, BUID_HI(pe->phb->buid),
 357                                 BUID_LO(pe->phb->buid));
 358         } else if (ibm_read_slot_reset_state != RTAS_UNKNOWN_SERVICE) {
 359                 /* Fake PE unavailable info */
 360                 rets[2] = 0;
 361                 ret = rtas_call(ibm_read_slot_reset_state, 3, 3, rets,
 362                                 config_addr, BUID_HI(pe->phb->buid),
 363                                 BUID_LO(pe->phb->buid));
 364         } else {
 365                 return EEH_STATE_NOT_SUPPORT;
 366         }
 367
 368         if (ret)
 369                 return ret;
 370
 371         /* Parse the result out */
 372         result = 0;
 373         if (rets[1]) {
 374                 switch(rets[0]) {
 375                 case 0:
 376                         result &= ~EEH_STATE_RESET_ACTIVE;
 377                         result |= EEH_STATE_MMIO_ACTIVE;
 378                         result |= EEH_STATE_DMA_ACTIVE;
 379                         break;
 380                 case 1:
 381                         result |= EEH_STATE_RESET_ACTIVE;
 382                         result |= EEH_STATE_MMIO_ACTIVE;
 383                         result |= EEH_STATE_DMA_ACTIVE;
 384                         break;
 385                 case 2:
 386                         result &= ~EEH_STATE_RESET_ACTIVE;
 387                         result &= ~EEH_STATE_MMIO_ACTIVE;
 388                         result &= ~EEH_STATE_DMA_ACTIVE;
 389                         break;
 390                 case 4:
 391                         result &= ~EEH_STATE_RESET_ACTIVE;
 392                         result &= ~EEH_STATE_MMIO_ACTIVE;
 393                         result &= ~EEH_STATE_DMA_ACTIVE;
 394                         result |= EEH_STATE_MMIO_ENABLED;
 395                         break;
 396                 case 5:
 397                         if (rets[2]) {
 398                                 if (state) *state = rets[2];
 399                                 result = EEH_STATE_UNAVAILABLE;
 400                         } else {
 401                                 result = EEH_STATE_NOT_SUPPORT;
 402                         }
 403                 default:
 404                         result = EEH_STATE_NOT_SUPPORT;
 405                 }
 406         } else {
 407                 result = EEH_STATE_NOT_SUPPORT;
 408         }
 409
 410         return result;
 411 }
 412
 413 /**
 414  * pseries_eeh_reset - Reset the specified PE
 415  * @pe: EEH PE
 416  * @option: reset option
 417  *
 418  * Reset the specified PE
 419  */
 420 static int pseries_eeh_reset(struct eeh_pe *pe, int option)
 421 {
 422         int config_addr;
 423         int ret;
 424
 425         /* Figure out PE address */
 426         config_addr = pe->config_addr;
 427         if (pe->addr)
 428                 config_addr = pe->addr;
 429
 430         /* Reset PE through RTAS call */
 431         ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL,
 432                         config_addr, BUID_HI(pe->phb->buid),
 433                         BUID_LO(pe->phb->buid), option);
 434
 435         /* If fundamental-reset not supported, try hot-reset */
 436         if (option == EEH_RESET_FUNDAMENTAL &&
 437             ret == -8) {
 438                 ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL,
 439                                 config_addr, BUID_HI(pe->phb->buid),
 440                                 BUID_LO(pe->phb->buid), EEH_RESET_HOT);
 441         }
 442
 443         return ret;
 444 }
 445
 446 /**
 447  * pseries_eeh_wait_state - Wait for PE state
 448  * @pe: EEH PE
 449  * @max_wait: maximal period in microsecond
 450  *
 451  * Wait for the state of associated PE. It might take some time
 452  * to retrieve the PE's state.
 453  */
 454 static int pseries_eeh_wait_state(struct eeh_pe *pe, int max_wait)
 455 {
 456         int ret;
 457         int mwait;
 458
 459         /*
 460          * According to PAPR, the state of PE might be temporarily
 461          * unavailable. Under the circumstance, we have to wait
 462          * for indicated time determined by firmware. The maximal
 463          * wait time is 5 minutes, which is acquired from the original
 464          * EEH implementation. Also, the original implementation
 465          * also defined the minimal wait time as 1 second.
 466          */
 467 #define EEH_STATE_MIN_WAIT_TIME (1000)
 468 #define EEH_STATE_MAX_WAIT_TIME (300 * 1000)
 469
 470         while (1) {
 471                 ret = pseries_eeh_get_state(pe, &mwait);
 472
 473                 /*
 474                  * If the PE's state is temporarily unavailable,
 475                  * we have to wait for the specified time. Otherwise,
 476                  * the PE's state will be returned immediately.
 477                  */
 478                 if (ret != EEH_STATE_UNAVAILABLE)
 479                         return ret;
 480
 481                 if (max_wait <= 0) {
 482                         pr_warning("%s: Timeout when getting PE's state (%d)\n",
 483                                 __func__, max_wait);
 484                         return EEH_STATE_NOT_SUPPORT;
 485                 }
 486
 487                 if (mwait <= 0) {
 488                         pr_warning("%s: Firmware returned bad wait value %d\n",
 489                                 __func__, mwait);
 490                         mwait = EEH_STATE_MIN_WAIT_TIME;
 491                 } else if (mwait > EEH_STATE_MAX_WAIT_TIME) {
 492                         pr_warning("%s: Firmware returned too long wait value %d\n",
 493                                 __func__, mwait);
 494                         mwait = EEH_STATE_MAX_WAIT_TIME;
 495                 }
 496
 497                 max_wait -= mwait;
 498                 msleep(mwait);
 499         }
 500
 501         return EEH_STATE_NOT_SUPPORT;
 502 }
 503
 504 /**
 505  * pseries_eeh_get_log - Retrieve error log
 506  * @pe: EEH PE
 507  * @severity: temporary or permanent error log
 508  * @drv_log: driver log to be combined with retrieved error log
 509  * @len: length of driver log
 510  *
 511  * Retrieve the temporary or permanent error from the PE.
 512  * Actually, the error will be retrieved through the dedicated
 513  * RTAS call.
 514  */
 515 static int pseries_eeh_get_log(struct eeh_pe *pe, int severity, char *drv_log, unsigned long len)
 516 {
 517         int config_addr;
 518         unsigned long flags;
 519         int ret;
 520
 521         spin_lock_irqsave(&slot_errbuf_lock, flags);
 522         memset(slot_errbuf, 0, eeh_error_buf_size);
 523
 524         /* Figure out the PE address */
 525         config_addr = pe->config_addr;
 526         if (pe->addr)
 527                 config_addr = pe->addr;
 528
 529         ret = rtas_call(ibm_slot_error_detail, 8, 1, NULL, config_addr,
 530                         BUID_HI(pe->phb->buid), BUID_LO(pe->phb->buid),
 531                         virt_to_phys(drv_log), len,
 532                         virt_to_phys(slot_errbuf), eeh_error_buf_size,
 533                         severity);
 534         if (!ret)
 535                 log_error(slot_errbuf, ERR_TYPE_RTAS_LOG, 0);
 536         spin_unlock_irqrestore(&slot_errbuf_lock, flags);
 537
 538         return ret;
 539 }
 540
 541 /**
 542  * pseries_eeh_configure_bridge - Configure PCI bridges in the indicated PE
 543  * @pe: EEH PE
 544  *
 545  * The function will be called to reconfigure the bridges included
 546  * in the specified PE so that the mulfunctional PE would be recovered
 547  * again.
 548  */
 549 static int pseries_eeh_configure_bridge(struct eeh_pe *pe)
 550 {
 551         int config_addr;
 552         int ret;
 553
 554         /* Figure out the PE address */
 555         config_addr = pe->config_addr;
 556         if (pe->addr)
 557                 config_addr = pe->addr;
 558
 559         /* Use new configure-pe function, if supported */
 560         if (ibm_configure_pe != RTAS_UNKNOWN_SERVICE) {
 561                 ret = rtas_call(ibm_configure_pe, 3, 1, NULL,
 562                                 config_addr, BUID_HI(pe->phb->buid),
 563                                 BUID_LO(pe->phb->buid));
 564         } else if (ibm_configure_bridge != RTAS_UNKNOWN_SERVICE) {
 565                 ret = rtas_call(ibm_configure_bridge, 3, 1, NULL,
 566                                 config_addr, BUID_HI(pe->phb->buid),
 567                                 BUID_LO(pe->phb->buid));
 568         } else {
 569                 return -EFAULT;
 570         }
 571
 572         if (ret)
 573                 pr_warning("%s: Unable to configure bridge PHB#%d-PE#%x (%d)\n",
 574                         __func__, pe->phb->global_number, pe->addr, ret);
 575
 576         return ret;
 577 }
 578
 579 /**
 580  * pseries_eeh_read_config - Read PCI config space
 581  * @dn: device node
 582  * @where: PCI address
 583  * @size: size to read
 584  * @val: return value
 585  *
 586  * Read config space from the speicifed device
 587  */
 588 static int pseries_eeh_read_config(struct device_node *dn, int where, int size, u32 *val)
 589 {
 590         struct pci_dn *pdn;
 591
 592         pdn = PCI_DN(dn);
 593
 594         return rtas_read_config(pdn, where, size, val);
 595 }
 596
 597 /**
 598  * pseries_eeh_write_config - Write PCI config space
 599  * @dn: device node
 600  * @where: PCI address
 601  * @size: size to write
 602  * @val: value to be written
 603  *
 604  * Write config space to the specified device
 605  */
 606 static int pseries_eeh_write_config(struct device_node *dn, int where, int size, u32 val)
 607 {
 608         struct pci_dn *pdn;
 609
 610         pdn = PCI_DN(dn);
 611
 612         return rtas_write_config(pdn, where, size, val);
 613 }
 614
 615 static struct eeh_ops pseries_eeh_ops = {
 616         .name                   = "pseries",
 617         .init                   = pseries_eeh_init,
 618         .of_probe               = pseries_eeh_of_probe,
 619         .dev_probe              = NULL,
 620         .set_option             = pseries_eeh_set_option,
 621         .get_pe_addr            = pseries_eeh_get_pe_addr,
 622         .get_state              = pseries_eeh_get_state,
 623         .reset                  = pseries_eeh_reset,
 624         .wait_state             = pseries_eeh_wait_state,
 625         .get_log                = pseries_eeh_get_log,
 626         .configure_bridge       = pseries_eeh_configure_bridge,
 627         .read_config            = pseries_eeh_read_config,
 628         .write_config           = pseries_eeh_write_config
 629 };
 630
 631 /**
 632  * eeh_pseries_init - Register platform dependent EEH operations
 633  *
 634  * EEH initialization on pseries platform. This function should be
 635  * called before any EEH related functions.
 636  */
 637 static int __init eeh_pseries_init(void)
 638 {
 639         int ret = -EINVAL;
 640
 641         if (!machine_is(pseries))
 642                 return ret;
 643
 644         ret = eeh_ops_register(&pseries_eeh_ops);
 645         if (!ret)
 646                 pr_info("EEH: pSeries platform initialized\n");
 647         else
 648                 pr_info("EEH: pSeries platform initialization failure (%d)\n",
 649                         ret);
 650
 651         return ret;
 652 }
 653
 654 early_initcall(eeh_pseries_init);