git.oblomov.eu Git - linux-2.6/blob - drivers/s390/scsi/zfcp_erp.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Error Recovery Procedures (ERP).
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include "zfcp_ext.h"
  13
  14 #define ZFCP_MAX_ERPS                   3
  15
  16 enum zfcp_erp_act_flags {
  17         ZFCP_STATUS_ERP_TIMEDOUT        = 0x10000000,
  18         ZFCP_STATUS_ERP_CLOSE_ONLY      = 0x01000000,
  19         ZFCP_STATUS_ERP_DISMISSING      = 0x00100000,
  20         ZFCP_STATUS_ERP_DISMISSED       = 0x00200000,
  21         ZFCP_STATUS_ERP_LOWMEM          = 0x00400000,
  22 };
  23
  24 enum zfcp_erp_steps {
  25         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
  26         ZFCP_ERP_STEP_FSF_XCONFIG       = 0x0001,
  27         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
  28         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
  29         ZFCP_ERP_STEP_NAMESERVER_LOOKUP = 0x0400,
  30         ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
  31         ZFCP_ERP_STEP_UNIT_CLOSING      = 0x1000,
  32         ZFCP_ERP_STEP_UNIT_OPENING      = 0x2000,
  33 };
  34
  35 enum zfcp_erp_act_type {
  36         ZFCP_ERP_ACTION_REOPEN_UNIT        = 1,
  37         ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
  38         ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
  39         ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
  40 };
  41
  42 enum zfcp_erp_act_state {
  43         ZFCP_ERP_ACTION_RUNNING = 1,
  44         ZFCP_ERP_ACTION_READY   = 2,
  45 };
  46
  47 enum zfcp_erp_act_result {
  48         ZFCP_ERP_SUCCEEDED = 0,
  49         ZFCP_ERP_FAILED    = 1,
  50         ZFCP_ERP_CONTINUES = 2,
  51         ZFCP_ERP_EXIT      = 3,
  52         ZFCP_ERP_DISMISSED = 4,
  53         ZFCP_ERP_NOMEM     = 5,
  54 };
  55
  56 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
  57 {
  58         zfcp_erp_modify_adapter_status(adapter, "erablk1", NULL,
  59                                        ZFCP_STATUS_COMMON_UNBLOCKED | mask,
  60                                        ZFCP_CLEAR);
  61 }
  62
  63 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
  64 {
  65         struct zfcp_erp_action *curr_act;
  66
  67         list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
  68                 if (act == curr_act)
  69                         return ZFCP_ERP_ACTION_RUNNING;
  70         return 0;
  71 }
  72
  73 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
  74 {
  75         struct zfcp_adapter *adapter = act->adapter;
  76
  77         list_move(&act->list, &act->adapter->erp_ready_head);
  78         zfcp_rec_dbf_event_action("erardy1", act);
  79         up(&adapter->erp_ready_sem);
  80         zfcp_rec_dbf_event_thread("erardy2", adapter);
  81 }
  82
  83 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
  84 {
  85         act->status |= ZFCP_STATUS_ERP_DISMISSED;
  86         if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
  87                 zfcp_erp_action_ready(act);
  88 }
  89
  90 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
  91 {
  92         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
  93                 zfcp_erp_action_dismiss(&unit->erp_action);
  94 }
  95
  96 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
  97 {
  98         struct zfcp_unit *unit;
  99
 100         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 101                 zfcp_erp_action_dismiss(&port->erp_action);
 102         else
 103                 list_for_each_entry(unit, &port->unit_list_head, list)
 104                     zfcp_erp_action_dismiss_unit(unit);
 105 }
 106
 107 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 108 {
 109         struct zfcp_port *port;
 110
 111         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 112                 zfcp_erp_action_dismiss(&adapter->erp_action);
 113         else
 114                 list_for_each_entry(port, &adapter->port_list_head, list)
 115                     zfcp_erp_action_dismiss_port(port);
 116 }
 117
 118 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 119                                  struct zfcp_port *port,
 120                                  struct zfcp_unit *unit)
 121 {
 122         int need = want;
 123         int u_status, p_status, a_status;
 124
 125         switch (want) {
 126         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 127                 u_status = atomic_read(&unit->status);
 128                 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 129                         return 0;
 130                 p_status = atomic_read(&port->status);
 131                 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
 132                       p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 133                         return 0;
 134                 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 135                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 136                 /* fall through */
 137         case ZFCP_ERP_ACTION_REOPEN_PORT:
 138         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 139                 p_status = atomic_read(&port->status);
 140                 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 141                         return 0;
 142                 a_status = atomic_read(&adapter->status);
 143                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
 144                       a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 145                         return 0;
 146                 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 147                         need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
 148                 /* fall through */
 149         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 150                 a_status = atomic_read(&adapter->status);
 151                 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 152                         return 0;
 153         }
 154
 155         return need;
 156 }
 157
 158 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
 159                                                   struct zfcp_adapter *adapter,
 160                                                   struct zfcp_port *port,
 161                                                   struct zfcp_unit *unit)
 162 {
 163         struct zfcp_erp_action *erp_action;
 164         u32 status = 0;
 165
 166         switch (need) {
 167         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 168                 zfcp_unit_get(unit);
 169                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
 170                 erp_action = &unit->erp_action;
 171                 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
 172                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 173                 break;
 174
 175         case ZFCP_ERP_ACTION_REOPEN_PORT:
 176         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 177                 zfcp_port_get(port);
 178                 zfcp_erp_action_dismiss_port(port);
 179                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
 180                 erp_action = &port->erp_action;
 181                 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
 182                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 183                 break;
 184
 185         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 186                 zfcp_adapter_get(adapter);
 187                 zfcp_erp_action_dismiss_adapter(adapter);
 188                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
 189                 erp_action = &adapter->erp_action;
 190                 if (!(atomic_read(&adapter->status) &
 191                       ZFCP_STATUS_COMMON_RUNNING))
 192                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 193                 break;
 194
 195         default:
 196                 return NULL;
 197         }
 198
 199         memset(erp_action, 0, sizeof(struct zfcp_erp_action));
 200         erp_action->adapter = adapter;
 201         erp_action->port = port;
 202         erp_action->unit = unit;
 203         erp_action->action = need;
 204         erp_action->status = status;
 205
 206         return erp_action;
 207 }
 208
 209 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 210                                    struct zfcp_port *port,
 211                                    struct zfcp_unit *unit, char *id, void *ref)
 212 {
 213         int retval = 1, need;
 214         struct zfcp_erp_action *act = NULL;
 215
 216         if (!(atomic_read(&adapter->status) &
 217               ZFCP_STATUS_ADAPTER_ERP_THREAD_UP))
 218                 return -EIO;
 219
 220         need = zfcp_erp_required_act(want, adapter, port, unit);
 221         if (!need)
 222                 goto out;
 223
 224         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 225         act = zfcp_erp_setup_act(need, adapter, port, unit);
 226         if (!act)
 227                 goto out;
 228         ++adapter->erp_total_count;
 229         list_add_tail(&act->list, &adapter->erp_ready_head);
 230         up(&adapter->erp_ready_sem);
 231         zfcp_rec_dbf_event_thread("eracte1", adapter);
 232         retval = 0;
 233  out:
 234         zfcp_rec_dbf_event_trigger(id, ref, want, need, act,
 235                                    adapter, port, unit);
 236         return retval;
 237 }
 238
 239 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 240                                     int clear_mask, char *id, void *ref)
 241 {
 242         zfcp_erp_adapter_block(adapter, clear_mask);
 243         zfcp_scsi_schedule_rports_block(adapter);
 244
 245         /* ensure propagation of failed status to new devices */
 246         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 247                 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
 248                 return -EIO;
 249         }
 250         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 251                                        adapter, NULL, NULL, id, ref);
 252 }
 253
 254 /**
 255  * zfcp_erp_adapter_reopen - Reopen adapter.
 256  * @adapter: Adapter to reopen.
 257  * @clear: Status flags to clear.
 258  * @id: Id for debug trace event.
 259  * @ref: Reference for debug trace event.
 260  */
 261 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
 262                              char *id, void *ref)
 263 {
 264         unsigned long flags;
 265
 266         read_lock_irqsave(&zfcp_data.config_lock, flags);
 267         write_lock(&adapter->erp_lock);
 268         _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
 269         write_unlock(&adapter->erp_lock);
 270         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 271 }
 272
 273 /**
 274  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 275  * @adapter: Adapter to shut down.
 276  * @clear: Status flags to clear.
 277  * @id: Id for debug trace event.
 278  * @ref: Reference for debug trace event.
 279  */
 280 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 281                                char *id, void *ref)
 282 {
 283         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 284         zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
 285 }
 286
 287 /**
 288  * zfcp_erp_port_shutdown - Shutdown port
 289  * @port: Port to shut down.
 290  * @clear: Status flags to clear.
 291  * @id: Id for debug trace event.
 292  * @ref: Reference for debug trace event.
 293  */
 294 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id,
 295                             void *ref)
 296 {
 297         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 298         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 299 }
 300
 301 /**
 302  * zfcp_erp_unit_shutdown - Shutdown unit
 303  * @unit: Unit to shut down.
 304  * @clear: Status flags to clear.
 305  * @id: Id for debug trace event.
 306  * @ref: Reference for debug trace event.
 307  */
 308 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
 309                             void *ref)
 310 {
 311         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 312         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 313 }
 314
 315 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 316 {
 317         zfcp_erp_modify_port_status(port, "erpblk1", NULL,
 318                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 319                                     ZFCP_CLEAR);
 320 }
 321
 322 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 323                                          int clear, char *id, void *ref)
 324 {
 325         zfcp_erp_port_block(port, clear);
 326         zfcp_scsi_schedule_rport_block(port);
 327
 328         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 329                 return;
 330
 331         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 332                                 port->adapter, port, NULL, id, ref);
 333 }
 334
 335 /**
 336  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 337  * @port: Port to force close and to reopen.
 338  * @id: Id for debug trace event.
 339  * @ref: Reference for debug trace event.
 340  */
 341 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id,
 342                                  void *ref)
 343 {
 344         unsigned long flags;
 345         struct zfcp_adapter *adapter = port->adapter;
 346
 347         read_lock_irqsave(&zfcp_data.config_lock, flags);
 348         write_lock(&adapter->erp_lock);
 349         _zfcp_erp_port_forced_reopen(port, clear, id, ref);
 350         write_unlock(&adapter->erp_lock);
 351         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 352 }
 353
 354 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id,
 355                                  void *ref)
 356 {
 357         zfcp_erp_port_block(port, clear);
 358         zfcp_scsi_schedule_rport_block(port);
 359
 360         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 361                 /* ensure propagation of failed status to new devices */
 362                 zfcp_erp_port_failed(port, "erpreo1", NULL);
 363                 return -EIO;
 364         }
 365
 366         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 367                                        port->adapter, port, NULL, id, ref);
 368 }
 369
 370 /**
 371  * zfcp_erp_port_reopen - trigger remote port recovery
 372  * @port: port to recover
 373  * @clear_mask: flags in port status to be cleared
 374  *
 375  * Returns 0 if recovery has been triggered, < 0 if not.
 376  */
 377 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
 378 {
 379         unsigned long flags;
 380         int retval;
 381         struct zfcp_adapter *adapter = port->adapter;
 382
 383         read_lock_irqsave(&zfcp_data.config_lock, flags);
 384         write_lock(&adapter->erp_lock);
 385         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 386         write_unlock(&adapter->erp_lock);
 387         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 388
 389         return retval;
 390 }
 391
 392 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 393 {
 394         zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
 395                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 396                                     ZFCP_CLEAR);
 397 }
 398
 399 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 400                                   void *ref)
 401 {
 402         struct zfcp_adapter *adapter = unit->port->adapter;
 403
 404         zfcp_erp_unit_block(unit, clear);
 405
 406         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 407                 return;
 408
 409         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 410                                 adapter, unit->port, unit, id, ref);
 411 }
 412
 413 /**
 414  * zfcp_erp_unit_reopen - initiate reopen of a unit
 415  * @unit: unit to be reopened
 416  * @clear_mask: specifies flags in unit status to be cleared
 417  * Return: 0 on success, < 0 on error
 418  */
 419 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 420                           void *ref)
 421 {
 422         unsigned long flags;
 423         struct zfcp_port *port = unit->port;
 424         struct zfcp_adapter *adapter = port->adapter;
 425
 426         read_lock_irqsave(&zfcp_data.config_lock, flags);
 427         write_lock(&adapter->erp_lock);
 428         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 429         write_unlock(&adapter->erp_lock);
 430         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 431 }
 432
 433 static int status_change_set(unsigned long mask, atomic_t *status)
 434 {
 435         return (atomic_read(status) ^ mask) & mask;
 436 }
 437
 438 static int status_change_clear(unsigned long mask, atomic_t *status)
 439 {
 440         return atomic_read(status) & mask;
 441 }
 442
 443 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 444 {
 445         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 446                 zfcp_rec_dbf_event_adapter("eraubl1", NULL, adapter);
 447         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 448 }
 449
 450 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 451 {
 452         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 453                 zfcp_rec_dbf_event_port("erpubl1", NULL, port);
 454         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 455 }
 456
 457 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 458 {
 459         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 460                 zfcp_rec_dbf_event_unit("eruubl1", NULL, unit);
 461         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 462 }
 463
 464 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 465 {
 466         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 467         zfcp_rec_dbf_event_action("erator1", erp_action);
 468 }
 469
 470 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 471 {
 472         struct zfcp_adapter *adapter = act->adapter;
 473
 474         if (!act->fsf_req)
 475                 return;
 476
 477         spin_lock(&adapter->req_list_lock);
 478         if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
 479             act->fsf_req->erp_action == act) {
 480                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 481                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 482                         act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 483                         zfcp_rec_dbf_event_action("erscf_1", act);
 484                         act->fsf_req->erp_action = NULL;
 485                 }
 486                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 487                         zfcp_rec_dbf_event_action("erscf_2", act);
 488                 if (act->fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
 489                                             ZFCP_STATUS_FSFREQ_DISMISSED))
 490                         act->fsf_req = NULL;
 491         } else
 492                 act->fsf_req = NULL;
 493         spin_unlock(&adapter->req_list_lock);
 494 }
 495
 496 /**
 497  * zfcp_erp_notify - Trigger ERP action.
 498  * @erp_action: ERP action to continue.
 499  * @set_mask: ERP action status flags to set.
 500  */
 501 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 502 {
 503         struct zfcp_adapter *adapter = erp_action->adapter;
 504         unsigned long flags;
 505
 506         write_lock_irqsave(&adapter->erp_lock, flags);
 507         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 508                 erp_action->status |= set_mask;
 509                 zfcp_erp_action_ready(erp_action);
 510         }
 511         write_unlock_irqrestore(&adapter->erp_lock, flags);
 512 }
 513
 514 /**
 515  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 516  * @data: ERP action (from timer data)
 517  */
 518 void zfcp_erp_timeout_handler(unsigned long data)
 519 {
 520         struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
 521         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 522 }
 523
 524 static void zfcp_erp_memwait_handler(unsigned long data)
 525 {
 526         zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
 527 }
 528
 529 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 530 {
 531         init_timer(&erp_action->timer);
 532         erp_action->timer.function = zfcp_erp_memwait_handler;
 533         erp_action->timer.data = (unsigned long) erp_action;
 534         erp_action->timer.expires = jiffies + HZ;
 535         add_timer(&erp_action->timer);
 536 }
 537
 538 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 539                                       int clear, char *id, void *ref)
 540 {
 541         struct zfcp_port *port;
 542
 543         list_for_each_entry(port, &adapter->port_list_head, list)
 544                 _zfcp_erp_port_reopen(port, clear, id, ref);
 545 }
 546
 547 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
 548                                       char *id, void *ref)
 549 {
 550         struct zfcp_unit *unit;
 551
 552         list_for_each_entry(unit, &port->unit_list_head, list)
 553                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 554 }
 555
 556 static void zfcp_erp_strategy_followup_actions(struct zfcp_erp_action *act)
 557 {
 558         struct zfcp_adapter *adapter = act->adapter;
 559         struct zfcp_port *port = act->port;
 560         struct zfcp_unit *unit = act->unit;
 561         u32 status = act->status;
 562
 563         /* initiate follow-up actions depending on success of finished action */
 564         switch (act->action) {
 565
 566         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 567                 if (status == ZFCP_ERP_SUCCEEDED)
 568                         _zfcp_erp_port_reopen_all(adapter, 0, "ersfa_1", NULL);
 569                 else
 570                         _zfcp_erp_adapter_reopen(adapter, 0, "ersfa_2", NULL);
 571                 break;
 572
 573         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 574                 if (status == ZFCP_ERP_SUCCEEDED)
 575                         _zfcp_erp_port_reopen(port, 0, "ersfa_3", NULL);
 576                 else
 577                         _zfcp_erp_adapter_reopen(adapter, 0, "ersfa_4", NULL);
 578                 break;
 579
 580         case ZFCP_ERP_ACTION_REOPEN_PORT:
 581                 if (status == ZFCP_ERP_SUCCEEDED)
 582                         _zfcp_erp_unit_reopen_all(port, 0, "ersfa_5", NULL);
 583                 else
 584                         _zfcp_erp_port_forced_reopen(port, 0, "ersfa_6", NULL);
 585                 break;
 586
 587         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 588                 if (status != ZFCP_ERP_SUCCEEDED)
 589                         _zfcp_erp_port_reopen(unit->port, 0, "ersfa_7", NULL);
 590                 break;
 591         }
 592 }
 593
 594 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 595 {
 596         unsigned long flags;
 597
 598         read_lock_irqsave(&zfcp_data.config_lock, flags);
 599         read_lock(&adapter->erp_lock);
 600         if (list_empty(&adapter->erp_ready_head) &&
 601             list_empty(&adapter->erp_running_head)) {
 602                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 603                                           &adapter->status);
 604                         wake_up(&adapter->erp_done_wqh);
 605         }
 606         read_unlock(&adapter->erp_lock);
 607         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 608 }
 609
 610 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 611 {
 612         if (zfcp_qdio_open(act->adapter))
 613                 return ZFCP_ERP_FAILED;
 614         init_waitqueue_head(&act->adapter->request_wq);
 615         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 616         return ZFCP_ERP_SUCCEEDED;
 617 }
 618
 619 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 620 {
 621         struct zfcp_port *port;
 622         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 623                                  adapter->peer_d_id);
 624         if (IS_ERR(port)) /* error or port already attached */
 625                 return;
 626         _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
 627 }
 628
 629 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 630 {
 631         int retries;
 632         int sleep = 1;
 633         struct zfcp_adapter *adapter = erp_action->adapter;
 634
 635         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 636
 637         for (retries = 7; retries; retries--) {
 638                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 639                                   &adapter->status);
 640                 write_lock_irq(&adapter->erp_lock);
 641                 zfcp_erp_action_to_running(erp_action);
 642                 write_unlock_irq(&adapter->erp_lock);
 643                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 644                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 645                                           &adapter->status);
 646                         return ZFCP_ERP_FAILED;
 647                 }
 648
 649                 zfcp_rec_dbf_event_thread_lock("erasfx1", adapter);
 650                 down(&adapter->erp_ready_sem);
 651                 zfcp_rec_dbf_event_thread_lock("erasfx2", adapter);
 652                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 653                         break;
 654
 655                 if (!(atomic_read(&adapter->status) &
 656                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 657                         break;
 658
 659                 ssleep(sleep);
 660                 sleep *= 2;
 661         }
 662
 663         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 664                           &adapter->status);
 665
 666         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 667                 return ZFCP_ERP_FAILED;
 668
 669         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 670                 zfcp_erp_enqueue_ptp_port(adapter);
 671
 672         return ZFCP_ERP_SUCCEEDED;
 673 }
 674
 675 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 676 {
 677         int ret;
 678         struct zfcp_adapter *adapter = act->adapter;
 679
 680         write_lock_irq(&adapter->erp_lock);
 681         zfcp_erp_action_to_running(act);
 682         write_unlock_irq(&adapter->erp_lock);
 683
 684         ret = zfcp_fsf_exchange_port_data(act);
 685         if (ret == -EOPNOTSUPP)
 686                 return ZFCP_ERP_SUCCEEDED;
 687         if (ret)
 688                 return ZFCP_ERP_FAILED;
 689
 690         zfcp_rec_dbf_event_thread_lock("erasox1", adapter);
 691         down(&adapter->erp_ready_sem);
 692         zfcp_rec_dbf_event_thread_lock("erasox2", adapter);
 693         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 694                 return ZFCP_ERP_FAILED;
 695
 696         return ZFCP_ERP_SUCCEEDED;
 697 }
 698
 699 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 700 {
 701         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 702                 return ZFCP_ERP_FAILED;
 703
 704         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 705                 return ZFCP_ERP_FAILED;
 706
 707         atomic_set(&act->adapter->stat_miss, 16);
 708         if (zfcp_status_read_refill(act->adapter))
 709                 return ZFCP_ERP_FAILED;
 710
 711         return ZFCP_ERP_SUCCEEDED;
 712 }
 713
 714 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 715 {
 716         struct zfcp_adapter *adapter = act->adapter;
 717
 718         /* close queues to ensure that buffers are not accessed by adapter */
 719         zfcp_qdio_close(adapter);
 720         zfcp_fsf_req_dismiss_all(adapter);
 721         adapter->fsf_req_seq_no = 0;
 722         zfcp_fc_wka_port_force_offline(&adapter->gs->ds);
 723         /* all ports and units are closed */
 724         zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
 725                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 726
 727         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 728                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 729 }
 730
 731 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
 732 {
 733         struct zfcp_adapter *adapter = act->adapter;
 734
 735         if (zfcp_erp_adapter_strategy_open_qdio(act)) {
 736                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 737                                   ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 738                                   &adapter->status);
 739                 return ZFCP_ERP_FAILED;
 740         }
 741
 742         if (zfcp_erp_adapter_strategy_open_fsf(act)) {
 743                 zfcp_erp_adapter_strategy_close(act);
 744                 return ZFCP_ERP_FAILED;
 745         }
 746
 747         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
 748
 749         return ZFCP_ERP_SUCCEEDED;
 750 }
 751
 752 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 753 {
 754         struct zfcp_adapter *adapter = act->adapter;
 755
 756         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
 757                 zfcp_erp_adapter_strategy_close(act);
 758                 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 759                         return ZFCP_ERP_EXIT;
 760         }
 761
 762         if (zfcp_erp_adapter_strategy_open(act)) {
 763                 ssleep(8);
 764                 return ZFCP_ERP_FAILED;
 765         }
 766
 767         return ZFCP_ERP_SUCCEEDED;
 768 }
 769
 770 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 771 {
 772         int retval;
 773
 774         retval = zfcp_fsf_close_physical_port(act);
 775         if (retval == -ENOMEM)
 776                 return ZFCP_ERP_NOMEM;
 777         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 778         if (retval)
 779                 return ZFCP_ERP_FAILED;
 780
 781         return ZFCP_ERP_CONTINUES;
 782 }
 783
 784 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 785 {
 786         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
 787 }
 788
 789 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 790 {
 791         struct zfcp_port *port = erp_action->port;
 792         int status = atomic_read(&port->status);
 793
 794         switch (erp_action->step) {
 795         case ZFCP_ERP_STEP_UNINITIALIZED:
 796                 zfcp_erp_port_strategy_clearstati(port);
 797                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 798                     (status & ZFCP_STATUS_COMMON_OPEN))
 799                         return zfcp_erp_port_forced_strategy_close(erp_action);
 800                 else
 801                         return ZFCP_ERP_FAILED;
 802
 803         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 804                 if (status & ZFCP_STATUS_PORT_PHYS_OPEN)
 805                         return ZFCP_ERP_SUCCEEDED;
 806         }
 807         return ZFCP_ERP_FAILED;
 808 }
 809
 810 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 811 {
 812         int retval;
 813
 814         retval = zfcp_fsf_close_port(erp_action);
 815         if (retval == -ENOMEM)
 816                 return ZFCP_ERP_NOMEM;
 817         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 818         if (retval)
 819                 return ZFCP_ERP_FAILED;
 820         return ZFCP_ERP_CONTINUES;
 821 }
 822
 823 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 824 {
 825         int retval;
 826
 827         retval = zfcp_fsf_open_port(erp_action);
 828         if (retval == -ENOMEM)
 829                 return ZFCP_ERP_NOMEM;
 830         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 831         if (retval)
 832                 return ZFCP_ERP_FAILED;
 833         return ZFCP_ERP_CONTINUES;
 834 }
 835
 836 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 837 {
 838         struct zfcp_adapter *adapter = act->adapter;
 839         struct zfcp_port *port = act->port;
 840
 841         if (port->wwpn != adapter->peer_wwpn) {
 842                 zfcp_erp_port_failed(port, "eroptp1", NULL);
 843                 return ZFCP_ERP_FAILED;
 844         }
 845         port->d_id = adapter->peer_d_id;
 846         return zfcp_erp_port_strategy_open_port(act);
 847 }
 848
 849 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
 850 {
 851         int retval;
 852         struct zfcp_port *port = container_of(work, struct zfcp_port,
 853                                               gid_pn_work);
 854
 855         retval = zfcp_fc_ns_gid_pn(&port->erp_action);
 856         if (retval == -ENOMEM)
 857                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_NOMEM);
 858         port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
 859         if (retval)
 860                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_FAILED);
 861         zfcp_port_put(port);
 862 }
 863
 864 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 865 {
 866         struct zfcp_adapter *adapter = act->adapter;
 867         struct zfcp_port *port = act->port;
 868         int p_status = atomic_read(&port->status);
 869
 870         switch (act->step) {
 871         case ZFCP_ERP_STEP_UNINITIALIZED:
 872         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 873         case ZFCP_ERP_STEP_PORT_CLOSING:
 874                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 875                         return zfcp_erp_open_ptp_port(act);
 876                 if (!port->d_id) {
 877                         zfcp_port_get(port);
 878                         if (!queue_work(zfcp_data.work_queue,
 879                                         &port->gid_pn_work))
 880                                 zfcp_port_put(port);
 881                         return ZFCP_ERP_CONTINUES;
 882                 }
 883                 /* fall through */
 884         case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
 885                 if (!port->d_id)
 886                         return ZFCP_ERP_FAILED;
 887                 return zfcp_erp_port_strategy_open_port(act);
 888
 889         case ZFCP_ERP_STEP_PORT_OPENING:
 890                 /* D_ID might have changed during open */
 891                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 892                         if (port->d_id)
 893                                 return ZFCP_ERP_SUCCEEDED;
 894                         else {
 895                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 896                                 return ZFCP_ERP_CONTINUES;
 897                         }
 898                 }
 899                 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
 900                         port->d_id = 0;
 901                         _zfcp_erp_port_reopen(port, 0, "erpsoc1", NULL);
 902                         return ZFCP_ERP_EXIT;
 903                 }
 904                 /* fall through otherwise */
 905         }
 906         return ZFCP_ERP_FAILED;
 907 }
 908
 909 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 910 {
 911         struct zfcp_port *port = erp_action->port;
 912
 913         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 914                 goto close_init_done;
 915
 916         switch (erp_action->step) {
 917         case ZFCP_ERP_STEP_UNINITIALIZED:
 918                 zfcp_erp_port_strategy_clearstati(port);
 919                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 920                         return zfcp_erp_port_strategy_close(erp_action);
 921                 break;
 922
 923         case ZFCP_ERP_STEP_PORT_CLOSING:
 924                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 925                         return ZFCP_ERP_FAILED;
 926                 break;
 927         }
 928
 929 close_init_done:
 930         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 931                 return ZFCP_ERP_EXIT;
 932
 933         return zfcp_erp_port_strategy_open_common(erp_action);
 934 }
 935
 936 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 937 {
 938         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 939                           ZFCP_STATUS_UNIT_SHARED |
 940                           ZFCP_STATUS_UNIT_READONLY,
 941                           &unit->status);
 942 }
 943
 944 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 945 {
 946         int retval = zfcp_fsf_close_unit(erp_action);
 947         if (retval == -ENOMEM)
 948                 return ZFCP_ERP_NOMEM;
 949         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 950         if (retval)
 951                 return ZFCP_ERP_FAILED;
 952         return ZFCP_ERP_CONTINUES;
 953 }
 954
 955 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 956 {
 957         int retval = zfcp_fsf_open_unit(erp_action);
 958         if (retval == -ENOMEM)
 959                 return ZFCP_ERP_NOMEM;
 960         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 961         if (retval)
 962                 return  ZFCP_ERP_FAILED;
 963         return ZFCP_ERP_CONTINUES;
 964 }
 965
 966 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 967 {
 968         struct zfcp_unit *unit = erp_action->unit;
 969
 970         switch (erp_action->step) {
 971         case ZFCP_ERP_STEP_UNINITIALIZED:
 972                 zfcp_erp_unit_strategy_clearstati(unit);
 973                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 974                         return zfcp_erp_unit_strategy_close(erp_action);
 975                 /* already closed, fall through */
 976         case ZFCP_ERP_STEP_UNIT_CLOSING:
 977                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 978                         return ZFCP_ERP_FAILED;
 979                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 980                         return ZFCP_ERP_EXIT;
 981                 return zfcp_erp_unit_strategy_open(erp_action);
 982
 983         case ZFCP_ERP_STEP_UNIT_OPENING:
 984                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 985                         return ZFCP_ERP_SUCCEEDED;
 986         }
 987         return ZFCP_ERP_FAILED;
 988 }
 989
 990 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 991 {
 992         switch (result) {
 993         case ZFCP_ERP_SUCCEEDED :
 994                 atomic_set(&unit->erp_counter, 0);
 995                 zfcp_erp_unit_unblock(unit);
 996                 break;
 997         case ZFCP_ERP_FAILED :
 998                 atomic_inc(&unit->erp_counter);
 999                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
1000                         dev_err(&unit->port->adapter->ccw_device->dev,
1001                                 "ERP failed for unit 0x%016Lx on "
1002                                 "port 0x%016Lx\n",
1003                                 (unsigned long long)unit->fcp_lun,
1004                                 (unsigned long long)unit->port->wwpn);
1005                         zfcp_erp_unit_failed(unit, "erusck1", NULL);
1006                 }
1007                 break;
1008         }
1009
1010         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1011                 zfcp_erp_unit_block(unit, 0);
1012                 result = ZFCP_ERP_EXIT;
1013         }
1014         return result;
1015 }
1016
1017 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1018 {
1019         switch (result) {
1020         case ZFCP_ERP_SUCCEEDED :
1021                 atomic_set(&port->erp_counter, 0);
1022                 zfcp_erp_port_unblock(port);
1023                 break;
1024
1025         case ZFCP_ERP_FAILED :
1026                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1027                         zfcp_erp_port_block(port, 0);
1028                         result = ZFCP_ERP_EXIT;
1029                 }
1030                 atomic_inc(&port->erp_counter);
1031                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1032                         dev_err(&port->adapter->ccw_device->dev,
1033                                 "ERP failed for remote port 0x%016Lx\n",
1034                                 (unsigned long long)port->wwpn);
1035                         zfcp_erp_port_failed(port, "erpsck1", NULL);
1036                 }
1037                 break;
1038         }
1039
1040         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1041                 zfcp_erp_port_block(port, 0);
1042                 result = ZFCP_ERP_EXIT;
1043         }
1044         return result;
1045 }
1046
1047 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1048                                            int result)
1049 {
1050         switch (result) {
1051         case ZFCP_ERP_SUCCEEDED :
1052                 atomic_set(&adapter->erp_counter, 0);
1053                 zfcp_erp_adapter_unblock(adapter);
1054                 break;
1055
1056         case ZFCP_ERP_FAILED :
1057                 atomic_inc(&adapter->erp_counter);
1058                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1059                         dev_err(&adapter->ccw_device->dev,
1060                                 "ERP cannot recover an error "
1061                                 "on the FCP device\n");
1062                         zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1063                 }
1064                 break;
1065         }
1066
1067         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1068                 zfcp_erp_adapter_block(adapter, 0);
1069                 result = ZFCP_ERP_EXIT;
1070         }
1071         return result;
1072 }
1073
1074 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1075                                           int result)
1076 {
1077         struct zfcp_adapter *adapter = erp_action->adapter;
1078         struct zfcp_port *port = erp_action->port;
1079         struct zfcp_unit *unit = erp_action->unit;
1080
1081         switch (erp_action->action) {
1082
1083         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1084                 result = zfcp_erp_strategy_check_unit(unit, result);
1085                 break;
1086
1087         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1088         case ZFCP_ERP_ACTION_REOPEN_PORT:
1089                 result = zfcp_erp_strategy_check_port(port, result);
1090                 break;
1091
1092         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1093                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1094                 break;
1095         }
1096         return result;
1097 }
1098
1099 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1100 {
1101         int status = atomic_read(target_status);
1102
1103         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1104             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1105                 return 1; /* take it online */
1106
1107         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1108             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1109                 return 1; /* take it offline */
1110
1111         return 0;
1112 }
1113
1114 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1115 {
1116         int action = act->action;
1117         struct zfcp_adapter *adapter = act->adapter;
1118         struct zfcp_port *port = act->port;
1119         struct zfcp_unit *unit = act->unit;
1120         u32 erp_status = act->status;
1121
1122         switch (action) {
1123         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1124                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1125                         _zfcp_erp_adapter_reopen(adapter,
1126                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1127                                                  "ersscg1", NULL);
1128                         return ZFCP_ERP_EXIT;
1129                 }
1130                 break;
1131
1132         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1133         case ZFCP_ERP_ACTION_REOPEN_PORT:
1134                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1135                         _zfcp_erp_port_reopen(port,
1136                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1137                                               "ersscg2", NULL);
1138                         return ZFCP_ERP_EXIT;
1139                 }
1140                 break;
1141
1142         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1143                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1144                         _zfcp_erp_unit_reopen(unit,
1145                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1146                                               "ersscg3", NULL);
1147                         return ZFCP_ERP_EXIT;
1148                 }
1149                 break;
1150         }
1151         return ret;
1152 }
1153
1154 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1155 {
1156         struct zfcp_adapter *adapter = erp_action->adapter;
1157
1158         adapter->erp_total_count--;
1159         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1160                 adapter->erp_low_mem_count--;
1161                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1162         }
1163
1164         list_del(&erp_action->list);
1165         zfcp_rec_dbf_event_action("eractd1", erp_action);
1166
1167         switch (erp_action->action) {
1168         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1169                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1170                                   &erp_action->unit->status);
1171                 break;
1172
1173         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1174         case ZFCP_ERP_ACTION_REOPEN_PORT:
1175                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1176                                   &erp_action->port->status);
1177                 break;
1178
1179         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1180                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1181                                   &erp_action->adapter->status);
1182                 break;
1183         }
1184 }
1185
1186 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1187 {
1188         struct zfcp_adapter *adapter = act->adapter;
1189         struct zfcp_port *port = act->port;
1190         struct zfcp_unit *unit = act->unit;
1191
1192         switch (act->action) {
1193         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1194                 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1195                         zfcp_unit_get(unit);
1196                         if (scsi_queue_work(unit->port->adapter->scsi_host,
1197                                             &unit->scsi_work) <= 0)
1198                                 zfcp_unit_put(unit);
1199                 }
1200                 zfcp_unit_put(unit);
1201                 break;
1202
1203         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1204         case ZFCP_ERP_ACTION_REOPEN_PORT:
1205                 if (result == ZFCP_ERP_SUCCEEDED)
1206                         zfcp_scsi_schedule_rport_register(port);
1207                 zfcp_port_put(port);
1208                 break;
1209
1210         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1211                 if (result == ZFCP_ERP_SUCCEEDED) {
1212                         register_service_level(&adapter->service_level);
1213                         schedule_work(&adapter->scan_work);
1214                 } else
1215                         unregister_service_level(&adapter->service_level);
1216                 zfcp_adapter_put(adapter);
1217                 break;
1218         }
1219 }
1220
1221 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1222 {
1223         switch (erp_action->action) {
1224         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1225                 return zfcp_erp_adapter_strategy(erp_action);
1226         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1227                 return zfcp_erp_port_forced_strategy(erp_action);
1228         case ZFCP_ERP_ACTION_REOPEN_PORT:
1229                 return zfcp_erp_port_strategy(erp_action);
1230         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1231                 return zfcp_erp_unit_strategy(erp_action);
1232         }
1233         return ZFCP_ERP_FAILED;
1234 }
1235
1236 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1237 {
1238         int retval;
1239         struct zfcp_adapter *adapter = erp_action->adapter;
1240         unsigned long flags;
1241
1242         read_lock_irqsave(&zfcp_data.config_lock, flags);
1243         write_lock(&adapter->erp_lock);
1244
1245         zfcp_erp_strategy_check_fsfreq(erp_action);
1246
1247         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1248                 zfcp_erp_action_dequeue(erp_action);
1249                 retval = ZFCP_ERP_DISMISSED;
1250                 goto unlock;
1251         }
1252
1253         zfcp_erp_action_to_running(erp_action);
1254
1255         /* no lock to allow for blocking operations */
1256         write_unlock(&adapter->erp_lock);
1257         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1258         retval = zfcp_erp_strategy_do_action(erp_action);
1259         read_lock_irqsave(&zfcp_data.config_lock, flags);
1260         write_lock(&adapter->erp_lock);
1261
1262         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1263                 retval = ZFCP_ERP_CONTINUES;
1264
1265         switch (retval) {
1266         case ZFCP_ERP_NOMEM:
1267                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1268                         ++adapter->erp_low_mem_count;
1269                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1270                 }
1271                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1272                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1273                 else {
1274                         zfcp_erp_strategy_memwait(erp_action);
1275                         retval = ZFCP_ERP_CONTINUES;
1276                 }
1277                 goto unlock;
1278
1279         case ZFCP_ERP_CONTINUES:
1280                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1281                         --adapter->erp_low_mem_count;
1282                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1283                 }
1284                 goto unlock;
1285         }
1286
1287         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1288         zfcp_erp_action_dequeue(erp_action);
1289         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1290         if (retval == ZFCP_ERP_EXIT)
1291                 goto unlock;
1292         zfcp_erp_strategy_followup_actions(erp_action);
1293
1294  unlock:
1295         write_unlock(&adapter->erp_lock);
1296         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1297
1298         if (retval != ZFCP_ERP_CONTINUES)
1299                 zfcp_erp_action_cleanup(erp_action, retval);
1300
1301         return retval;
1302 }
1303
1304 static int zfcp_erp_thread(void *data)
1305 {
1306         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1307         struct list_head *next;
1308         struct zfcp_erp_action *act;
1309         unsigned long flags;
1310         int ignore;
1311
1312         daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1313         /* Block all signals */
1314         siginitsetinv(&current->blocked, 0);
1315         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1316         wake_up(&adapter->erp_thread_wqh);
1317
1318         while (!(atomic_read(&adapter->status) &
1319                  ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1320
1321                 zfcp_rec_dbf_event_thread_lock("erthrd1", adapter);
1322                 ignore = down_interruptible(&adapter->erp_ready_sem);
1323                 zfcp_rec_dbf_event_thread_lock("erthrd2", adapter);
1324
1325                 write_lock_irqsave(&adapter->erp_lock, flags);
1326                 next = adapter->erp_ready_head.next;
1327                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1328
1329                 if (next != &adapter->erp_ready_head) {
1330                         act = list_entry(next, struct zfcp_erp_action, list);
1331
1332                         /* there is more to come after dismission, no notify */
1333                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1334                                 zfcp_erp_wakeup(adapter);
1335                 }
1336         }
1337
1338         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1339         wake_up(&adapter->erp_thread_wqh);
1340
1341         return 0;
1342 }
1343
1344 /**
1345  * zfcp_erp_thread_setup - Start ERP thread for adapter
1346  * @adapter: Adapter to start the ERP thread for
1347  *
1348  * Returns 0 on success or error code from kernel_thread()
1349  */
1350 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1351 {
1352         int retval;
1353
1354         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1355         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1356         if (retval < 0) {
1357                 dev_err(&adapter->ccw_device->dev,
1358                         "Creating an ERP thread for the FCP device failed.\n");
1359                 return retval;
1360         }
1361         wait_event(adapter->erp_thread_wqh,
1362                    atomic_read(&adapter->status) &
1363                         ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1364         return 0;
1365 }
1366
1367 /**
1368  * zfcp_erp_thread_kill - Stop ERP thread.
1369  * @adapter: Adapter where the ERP thread should be stopped.
1370  *
1371  * The caller of this routine ensures that the specified adapter has
1372  * been shut down and that this operation has been completed. Thus,
1373  * there are no pending erp_actions which would need to be handled
1374  * here.
1375  */
1376 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1377 {
1378         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1379         up(&adapter->erp_ready_sem);
1380         zfcp_rec_dbf_event_thread_lock("erthrk1", adapter);
1381
1382         wait_event(adapter->erp_thread_wqh,
1383                    !(atomic_read(&adapter->status) &
1384                                 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1385
1386         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1387                           &adapter->status);
1388 }
1389
1390 /**
1391  * zfcp_erp_adapter_failed - Set adapter status to failed.
1392  * @adapter: Failed adapter.
1393  * @id: Event id for debug trace.
1394  * @ref: Reference for debug trace.
1395  */
1396 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1397 {
1398         zfcp_erp_modify_adapter_status(adapter, id, ref,
1399                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1400 }
1401
1402 /**
1403  * zfcp_erp_port_failed - Set port status to failed.
1404  * @port: Failed port.
1405  * @id: Event id for debug trace.
1406  * @ref: Reference for debug trace.
1407  */
1408 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1409 {
1410         zfcp_erp_modify_port_status(port, id, ref,
1411                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1412 }
1413
1414 /**
1415  * zfcp_erp_unit_failed - Set unit status to failed.
1416  * @unit: Failed unit.
1417  * @id: Event id for debug trace.
1418  * @ref: Reference for debug trace.
1419  */
1420 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1421 {
1422         zfcp_erp_modify_unit_status(unit, id, ref,
1423                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1424 }
1425
1426 /**
1427  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1428  * @adapter: adapter for which to wait for completion of its error recovery
1429  */
1430 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1431 {
1432         wait_event(adapter->erp_done_wqh,
1433                    !(atomic_read(&adapter->status) &
1434                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1435 }
1436
1437 /**
1438  * zfcp_erp_modify_adapter_status - change adapter status bits
1439  * @adapter: adapter to change the status
1440  * @id: id for the debug trace
1441  * @ref: reference for the debug trace
1442  * @mask: status bits to change
1443  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1444  *
1445  * Changes in common status bits are propagated to attached ports and units.
1446  */
1447 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1448                                     void *ref, u32 mask, int set_or_clear)
1449 {
1450         struct zfcp_port *port;
1451         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1452
1453         if (set_or_clear == ZFCP_SET) {
1454                 if (status_change_set(mask, &adapter->status))
1455                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1456                 atomic_set_mask(mask, &adapter->status);
1457         } else {
1458                 if (status_change_clear(mask, &adapter->status))
1459                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1460                 atomic_clear_mask(mask, &adapter->status);
1461                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1462                         atomic_set(&adapter->erp_counter, 0);
1463         }
1464
1465         if (common_mask)
1466                 list_for_each_entry(port, &adapter->port_list_head, list)
1467                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1468                                                     set_or_clear);
1469 }
1470
1471 /**
1472  * zfcp_erp_modify_port_status - change port status bits
1473  * @port: port to change the status bits
1474  * @id: id for the debug trace
1475  * @ref: reference for the debug trace
1476  * @mask: status bits to change
1477  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1478  *
1479  * Changes in common status bits are propagated to attached units.
1480  */
1481 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1482                                  u32 mask, int set_or_clear)
1483 {
1484         struct zfcp_unit *unit;
1485         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1486
1487         if (set_or_clear == ZFCP_SET) {
1488                 if (status_change_set(mask, &port->status))
1489                         zfcp_rec_dbf_event_port(id, ref, port);
1490                 atomic_set_mask(mask, &port->status);
1491         } else {
1492                 if (status_change_clear(mask, &port->status))
1493                         zfcp_rec_dbf_event_port(id, ref, port);
1494                 atomic_clear_mask(mask, &port->status);
1495                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1496                         atomic_set(&port->erp_counter, 0);
1497         }
1498
1499         if (common_mask)
1500                 list_for_each_entry(unit, &port->unit_list_head, list)
1501                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1502                                                     set_or_clear);
1503 }
1504
1505 /**
1506  * zfcp_erp_modify_unit_status - change unit status bits
1507  * @unit: unit to change the status bits
1508  * @id: id for the debug trace
1509  * @ref: reference for the debug trace
1510  * @mask: status bits to change
1511  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1512  */
1513 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1514                                  u32 mask, int set_or_clear)
1515 {
1516         if (set_or_clear == ZFCP_SET) {
1517                 if (status_change_set(mask, &unit->status))
1518                         zfcp_rec_dbf_event_unit(id, ref, unit);
1519                 atomic_set_mask(mask, &unit->status);
1520         } else {
1521                 if (status_change_clear(mask, &unit->status))
1522                         zfcp_rec_dbf_event_unit(id, ref, unit);
1523                 atomic_clear_mask(mask, &unit->status);
1524                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1525                         atomic_set(&unit->erp_counter, 0);
1526                 }
1527         }
1528 }
1529
1530 /**
1531  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1532  * @port: The "boxed" port.
1533  * @id: The debug trace id.
1534  * @id: Reference for the debug trace.
1535  */
1536 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1537 {
1538         unsigned long flags;
1539
1540         read_lock_irqsave(&zfcp_data.config_lock, flags);
1541         zfcp_erp_modify_port_status(port, id, ref,
1542                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1543         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1544         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1545 }
1546
1547 /**
1548  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1549  * @port: The "boxed" unit.
1550  * @id: The debug trace id.
1551  * @id: Reference for the debug trace.
1552  */
1553 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1554 {
1555         zfcp_erp_modify_unit_status(unit, id, ref,
1556                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1557         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1558 }
1559
1560 /**
1561  * zfcp_erp_port_access_denied - Adapter denied access to port.
1562  * @port: port where access has been denied
1563  * @id: id for debug trace
1564  * @ref: reference for debug trace
1565  *
1566  * Since the adapter has denied access, stop using the port and the
1567  * attached units.
1568  */
1569 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1570 {
1571         unsigned long flags;
1572
1573         read_lock_irqsave(&zfcp_data.config_lock, flags);
1574         zfcp_erp_modify_port_status(port, id, ref,
1575                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1576                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1577         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1578 }
1579
1580 /**
1581  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1582  * @unit: unit where access has been denied
1583  * @id: id for debug trace
1584  * @ref: reference for debug trace
1585  *
1586  * Since the adapter has denied access, stop using the unit.
1587  */
1588 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1589 {
1590         zfcp_erp_modify_unit_status(unit, id, ref,
1591                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1592                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1593 }
1594
1595 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1596                                          void *ref)
1597 {
1598         int status = atomic_read(&unit->status);
1599         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1600                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1601                 return;
1602
1603         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1604 }
1605
1606 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1607                                          void *ref)
1608 {
1609         struct zfcp_unit *unit;
1610         int status = atomic_read(&port->status);
1611
1612         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1613                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1614                 list_for_each_entry(unit, &port->unit_list_head, list)
1615                                     zfcp_erp_unit_access_changed(unit, id, ref);
1616                 return;
1617         }
1618
1619         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1620 }
1621
1622 /**
1623  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1624  * @adapter: Adapter where the Access Control Table (ACT) changed
1625  * @id: Id for debug trace
1626  * @ref: Reference for debug trace
1627  */
1628 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1629                                      void *ref)
1630 {
1631         struct zfcp_port *port;
1632         unsigned long flags;
1633
1634         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1635                 return;
1636
1637         read_lock_irqsave(&zfcp_data.config_lock, flags);
1638         list_for_each_entry(port, &adapter->port_list_head, list)
1639                 zfcp_erp_port_access_changed(port, id, ref);
1640         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1641 }