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 static int pseries_eeh_cap_start(struct device_node *dn)
 137 {
 138         struct pci_dn *pdn = PCI_DN(dn);
 139         u32 status;
 140
 141         if (!pdn)
 142                 return 0;
 143
 144         rtas_read_config(pdn, PCI_STATUS, 2, &status);
 145         if (!(status & PCI_STATUS_CAP_LIST))
 146                 return 0;
 147
 148         return PCI_CAPABILITY_LIST;
 149 }
 150
 151
 152 static int pseries_eeh_find_cap(struct device_node *dn, int cap)
 153 {
 154         struct pci_dn *pdn = PCI_DN(dn);
 155         int pos = pseries_eeh_cap_start(dn);
 156         int cnt = 48;   /* Maximal number of capabilities */
 157         u32 id;
 158
 159         if (!pos)
 160                 return 0;
 161
 162         while (cnt--) {
 163                 rtas_read_config(pdn, pos, 1, &pos);
 164                 if (pos < 0x40)
 165                         break;
 166                 pos &= ~3;
 167                 rtas_read_config(pdn, pos + PCI_CAP_LIST_ID, 1, &id);
 168                 if (id == 0xff)
 169                         break;
 170                 if (id == cap)
 171                         return pos;
 172                 pos += PCI_CAP_LIST_NEXT;
 173         }
 174
 175         return 0;
 176 }
 177
 178 /**
 179  * pseries_eeh_of_probe - EEH probe on the given device
 180  * @dn: OF node
 181  * @flag: Unused
 182  *
 183  * When EEH module is installed during system boot, all PCI devices
 184  * are checked one by one to see if it supports EEH. The function
 185  * is introduced for the purpose.
 186  */
 187 static void *pseries_eeh_of_probe(struct device_node *dn, void *flag)
 188 {
 189         struct eeh_dev *edev;
 190         struct eeh_pe pe;
 191         struct pci_dn *pdn = PCI_DN(dn);
 192         const __be32 *classp, *vendorp, *devicep;
 193         u32 class_code;
 194         const __be32 *regs;
 195         u32 pcie_flags;
 196         int enable = 0;
 197         int ret;
 198
 199         /* Retrieve OF node and eeh device */
 200         edev = of_node_to_eeh_dev(dn);
 201         if (edev->pe || !of_device_is_available(dn))
 202                 return NULL;
 203
 204         /* Retrieve class/vendor/device IDs */
 205         classp = of_get_property(dn, "class-code", NULL);
 206         vendorp = of_get_property(dn, "vendor-id", NULL);
 207         devicep = of_get_property(dn, "device-id", NULL);
 208
 209         /* Skip for bad OF node or PCI-ISA bridge */
 210         if (!classp || !vendorp || !devicep)
 211                 return NULL;
 212         if (dn->type && !strcmp(dn->type, "isa"))
 213                 return NULL;
 214
 215         class_code = of_read_number(classp, 1);
 216
 217         /*
 218          * Update class code and mode of eeh device. We need
 219          * correctly reflects that current device is root port
 220          * or PCIe switch downstream port.
 221          */
 222         edev->class_code = class_code;
 223         edev->pcie_cap = pseries_eeh_find_cap(dn, PCI_CAP_ID_EXP);
 224         edev->mode &= 0xFFFFFF00;
 225         if ((edev->class_code >> 8) == PCI_CLASS_BRIDGE_PCI) {
 226                 edev->mode |= EEH_DEV_BRIDGE;
 227                 if (edev->pcie_cap) {
 228                         rtas_read_config(pdn, edev->pcie_cap + PCI_EXP_FLAGS,
 229                                          2, &pcie_flags);
 230                         pcie_flags = (pcie_flags & PCI_EXP_FLAGS_TYPE) >> 4;
 231                         if (pcie_flags == PCI_EXP_TYPE_ROOT_PORT)
 232                                 edev->mode |= EEH_DEV_ROOT_PORT;
 233                         else if (pcie_flags == PCI_EXP_TYPE_DOWNSTREAM)
 234                                 edev->mode |= EEH_DEV_DS_PORT;
 235                 }
 236         }
 237
 238         /* Retrieve the device address */
 239         regs = of_get_property(dn, "reg", NULL);
 240         if (!regs) {
 241                 pr_warning("%s: OF node property %s::reg not found\n",
 242                         __func__, dn->full_name);
 243                 return NULL;
 244         }
 245
 246         /* Initialize the fake PE */
 247         memset(&pe, 0, sizeof(struct eeh_pe));
 248         pe.phb = edev->phb;
 249         pe.config_addr = of_read_number(regs, 1);
 250
 251         /* Enable EEH on the device */
 252         ret = eeh_ops->set_option(&pe, EEH_OPT_ENABLE);
 253         if (!ret) {
 254                 edev->config_addr = of_read_number(regs, 1);
 255                 /* Retrieve PE address */
 256                 edev->pe_config_addr = eeh_ops->get_pe_addr(&pe);
 257                 pe.addr = edev->pe_config_addr;
 258
 259                 /* Some older systems (Power4) allow the ibm,set-eeh-option
 260                  * call to succeed even on nodes where EEH is not supported.
 261                  * Verify support explicitly.
 262                  */
 263                 ret = eeh_ops->get_state(&pe, NULL);
 264                 if (ret > 0 && ret != EEH_STATE_NOT_SUPPORT)
 265                         enable = 1;
 266
 267                 if (enable) {
 268                         eeh_subsystem_enabled = 1;
 269                         eeh_add_to_parent_pe(edev);
 270
 271                         pr_debug("%s: EEH enabled on %s PHB#%d-PE#%x, config addr#%x\n",
 272                                 __func__, dn->full_name, pe.phb->global_number,
 273                                 pe.addr, pe.config_addr);
 274                 } else if (dn->parent && of_node_to_eeh_dev(dn->parent) &&
 275                            (of_node_to_eeh_dev(dn->parent))->pe) {
 276                         /* This device doesn't support EEH, but it may have an
 277                          * EEH parent, in which case we mark it as supported.
 278                          */
 279                         edev->config_addr = of_node_to_eeh_dev(dn->parent)->config_addr;
 280                         edev->pe_config_addr = of_node_to_eeh_dev(dn->parent)->pe_config_addr;
 281                         eeh_add_to_parent_pe(edev);
 282                 }
 283         }
 284
 285         /* Save memory bars */
 286         eeh_save_bars(edev);
 287
 288         return NULL;
 289 }
 290
 291 /**
 292  * pseries_eeh_set_option - Initialize EEH or MMIO/DMA reenable
 293  * @pe: EEH PE
 294  * @option: operation to be issued
 295  *
 296  * The function is used to control the EEH functionality globally.
 297  * Currently, following options are support according to PAPR:
 298  * Enable EEH, Disable EEH, Enable MMIO and Enable DMA
 299  */
 300 static int pseries_eeh_set_option(struct eeh_pe *pe, int option)
 301 {
 302         int ret = 0;
 303         int config_addr;
 304
 305         /*
 306          * When we're enabling or disabling EEH functioality on
 307          * the particular PE, the PE config address is possibly
 308          * unavailable. Therefore, we have to figure it out from
 309          * the FDT node.
 310          */
 311         switch (option) {
 312         case EEH_OPT_DISABLE:
 313         case EEH_OPT_ENABLE:
 314         case EEH_OPT_THAW_MMIO:
 315         case EEH_OPT_THAW_DMA:
 316                 config_addr = pe->config_addr;
 317                 if (pe->addr)
 318                         config_addr = pe->addr;
 319                 break;
 320
 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_warning("%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_warning("%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                 default:
 468                         result = EEH_STATE_NOT_SUPPORT;
 469                 }
 470         } else {
 471                 result = EEH_STATE_NOT_SUPPORT;
 472         }
 473
 474         return result;
 475 }
 476
 477 /**
 478  * pseries_eeh_reset - Reset the specified PE
 479  * @pe: EEH PE
 480  * @option: reset option
 481  *
 482  * Reset the specified PE
 483  */
 484 static int pseries_eeh_reset(struct eeh_pe *pe, int option)
 485 {
 486         int config_addr;
 487         int ret;
 488
 489         /* Figure out PE address */
 490         config_addr = pe->config_addr;
 491         if (pe->addr)
 492                 config_addr = pe->addr;
 493
 494         /* Reset PE through RTAS call */
 495         ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL,
 496                         config_addr, BUID_HI(pe->phb->buid),
 497                         BUID_LO(pe->phb->buid), option);
 498
 499         /* If fundamental-reset not supported, try hot-reset */
 500         if (option == EEH_RESET_FUNDAMENTAL &&
 501             ret == -8) {
 502                 ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL,
 503                                 config_addr, BUID_HI(pe->phb->buid),
 504                                 BUID_LO(pe->phb->buid), EEH_RESET_HOT);
 505         }
 506
 507         return ret;
 508 }
 509
 510 /**
 511  * pseries_eeh_wait_state - Wait for PE state
 512  * @pe: EEH PE
 513  * @max_wait: maximal period in microsecond
 514  *
 515  * Wait for the state of associated PE. It might take some time
 516  * to retrieve the PE's state.
 517  */
 518 static int pseries_eeh_wait_state(struct eeh_pe *pe, int max_wait)
 519 {
 520         int ret;
 521         int mwait;
 522
 523         /*
 524          * According to PAPR, the state of PE might be temporarily
 525          * unavailable. Under the circumstance, we have to wait
 526          * for indicated time determined by firmware. The maximal
 527          * wait time is 5 minutes, which is acquired from the original
 528          * EEH implementation. Also, the original implementation
 529          * also defined the minimal wait time as 1 second.
 530          */
 531 #define EEH_STATE_MIN_WAIT_TIME (1000)
 532 #define EEH_STATE_MAX_WAIT_TIME (300 * 1000)
 533
 534         while (1) {
 535                 ret = pseries_eeh_get_state(pe, &mwait);
 536
 537                 /*
 538                  * If the PE's state is temporarily unavailable,
 539                  * we have to wait for the specified time. Otherwise,
 540                  * the PE's state will be returned immediately.
 541                  */
 542                 if (ret != EEH_STATE_UNAVAILABLE)
 543                         return ret;
 544
 545                 if (max_wait <= 0) {
 546                         pr_warning("%s: Timeout when getting PE's state (%d)\n",
 547                                 __func__, max_wait);
 548                         return EEH_STATE_NOT_SUPPORT;
 549                 }
 550
 551                 if (mwait <= 0) {
 552                         pr_warning("%s: Firmware returned bad wait value %d\n",
 553                                 __func__, mwait);
 554                         mwait = EEH_STATE_MIN_WAIT_TIME;
 555                 } else if (mwait > EEH_STATE_MAX_WAIT_TIME) {
 556                         pr_warning("%s: Firmware returned too long wait value %d\n",
 557                                 __func__, mwait);
 558                         mwait = EEH_STATE_MAX_WAIT_TIME;
 559                 }
 560
 561                 max_wait -= mwait;
 562                 msleep(mwait);
 563         }
 564
 565         return EEH_STATE_NOT_SUPPORT;
 566 }
 567
 568 /**
 569  * pseries_eeh_get_log - Retrieve error log
 570  * @pe: EEH PE
 571  * @severity: temporary or permanent error log
 572  * @drv_log: driver log to be combined with retrieved error log
 573  * @len: length of driver log
 574  *
 575  * Retrieve the temporary or permanent error from the PE.
 576  * Actually, the error will be retrieved through the dedicated
 577  * RTAS call.
 578  */
 579 static int pseries_eeh_get_log(struct eeh_pe *pe, int severity, char *drv_log, unsigned long len)
 580 {
 581         int config_addr;
 582         unsigned long flags;
 583         int ret;
 584
 585         spin_lock_irqsave(&slot_errbuf_lock, flags);
 586         memset(slot_errbuf, 0, eeh_error_buf_size);
 587
 588         /* Figure out the PE address */
 589         config_addr = pe->config_addr;
 590         if (pe->addr)
 591                 config_addr = pe->addr;
 592
 593         ret = rtas_call(ibm_slot_error_detail, 8, 1, NULL, config_addr,
 594                         BUID_HI(pe->phb->buid), BUID_LO(pe->phb->buid),
 595                         virt_to_phys(drv_log), len,
 596                         virt_to_phys(slot_errbuf), eeh_error_buf_size,
 597                         severity);
 598         if (!ret)
 599                 log_error(slot_errbuf, ERR_TYPE_RTAS_LOG, 0);
 600         spin_unlock_irqrestore(&slot_errbuf_lock, flags);
 601
 602         return ret;
 603 }
 604
 605 /**
 606  * pseries_eeh_configure_bridge - Configure PCI bridges in the indicated PE
 607  * @pe: EEH PE
 608  *
 609  * The function will be called to reconfigure the bridges included
 610  * in the specified PE so that the mulfunctional PE would be recovered
 611  * again.
 612  */
 613 static int pseries_eeh_configure_bridge(struct eeh_pe *pe)
 614 {
 615         int config_addr;
 616         int ret;
 617
 618         /* Figure out the PE address */
 619         config_addr = pe->config_addr;
 620         if (pe->addr)
 621                 config_addr = pe->addr;
 622
 623         /* Use new configure-pe function, if supported */
 624         if (ibm_configure_pe != RTAS_UNKNOWN_SERVICE) {
 625                 ret = rtas_call(ibm_configure_pe, 3, 1, NULL,
 626                                 config_addr, BUID_HI(pe->phb->buid),
 627                                 BUID_LO(pe->phb->buid));
 628         } else if (ibm_configure_bridge != RTAS_UNKNOWN_SERVICE) {
 629                 ret = rtas_call(ibm_configure_bridge, 3, 1, NULL,
 630                                 config_addr, BUID_HI(pe->phb->buid),
 631                                 BUID_LO(pe->phb->buid));
 632         } else {
 633                 return -EFAULT;
 634         }
 635
 636         if (ret)
 637                 pr_warning("%s: Unable to configure bridge PHB#%d-PE#%x (%d)\n",
 638                         __func__, pe->phb->global_number, pe->addr, ret);
 639
 640         return ret;
 641 }
 642
 643 /**
 644  * pseries_eeh_read_config - Read PCI config space
 645  * @dn: device node
 646  * @where: PCI address
 647  * @size: size to read
 648  * @val: return value
 649  *
 650  * Read config space from the speicifed device
 651  */
 652 static int pseries_eeh_read_config(struct device_node *dn, int where, int size, u32 *val)
 653 {
 654         struct pci_dn *pdn;
 655
 656         pdn = PCI_DN(dn);
 657
 658         return rtas_read_config(pdn, where, size, val);
 659 }
 660
 661 /**
 662  * pseries_eeh_write_config - Write PCI config space
 663  * @dn: device node
 664  * @where: PCI address
 665  * @size: size to write
 666  * @val: value to be written
 667  *
 668  * Write config space to the specified device
 669  */
 670 static int pseries_eeh_write_config(struct device_node *dn, int where, int size, u32 val)
 671 {
 672         struct pci_dn *pdn;
 673
 674         pdn = PCI_DN(dn);
 675
 676         return rtas_write_config(pdn, where, size, val);
 677 }
 678
 679 static struct eeh_ops pseries_eeh_ops = {
 680         .name                   = "pseries",
 681         .init                   = pseries_eeh_init,
 682         .of_probe               = pseries_eeh_of_probe,
 683         .dev_probe              = NULL,
 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         .read_config            = pseries_eeh_read_config,
 692         .write_config           = pseries_eeh_write_config,
 693         .next_error             = NULL,
 694         .restore_config         = NULL
 695 };
 696
 697 /**
 698  * eeh_pseries_init - Register platform dependent EEH operations
 699  *
 700  * EEH initialization on pseries platform. This function should be
 701  * called before any EEH related functions.
 702  */
 703 static int __init eeh_pseries_init(void)
 704 {
 705         int ret = -EINVAL;
 706
 707         if (!machine_is(pseries))
 708                 return ret;
 709
 710         ret = eeh_ops_register(&pseries_eeh_ops);
 711         if (!ret)
 712                 pr_info("EEH: pSeries platform initialized\n");
 713         else
 714                 pr_info("EEH: pSeries platform initialization failure (%d)\n",
 715                         ret);
 716
 717         return ret;
 718 }
 719
 720 early_initcall(eeh_pseries_init);