drivers/s390/scsi/zfcp_erp.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Error Recovery Procedures (ERP).
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   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, 15, 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(146, act);
  79         up(&adapter->erp_ready_sem);
  80         zfcp_rec_dbf_event_thread(2, 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, u8 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(1, 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, u8 id, void *ref)
 241 {
 242         zfcp_erp_adapter_block(adapter, clear_mask);
 243
 244         /* ensure propagation of failed status to new devices */
 245         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 246                 zfcp_erp_adapter_failed(adapter, 13, NULL);
 247                 return -EIO;
 248         }
 249         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 250                                        adapter, NULL, NULL, id, ref);
 251 }
 252
 253 /**
 254  * zfcp_erp_adapter_reopen - Reopen adapter.
 255  * @adapter: Adapter to reopen.
 256  * @clear: Status flags to clear.
 257  * @id: Id for debug trace event.
 258  * @ref: Reference for debug trace event.
 259  */
 260 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
 261                              u8 id, void *ref)
 262 {
 263         unsigned long flags;
 264
 265         read_lock_irqsave(&zfcp_data.config_lock, flags);
 266         write_lock(&adapter->erp_lock);
 267         _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
 268         write_unlock(&adapter->erp_lock);
 269         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 270 }
 271
 272 /**
 273  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 274  * @adapter: Adapter to shut down.
 275  * @clear: Status flags to clear.
 276  * @id: Id for debug trace event.
 277  * @ref: Reference for debug trace event.
 278  */
 279 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 280                                u8 id, void *ref)
 281 {
 282         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 283         zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
 284 }
 285
 286 /**
 287  * zfcp_erp_port_shutdown - Shutdown port
 288  * @port: Port to shut down.
 289  * @clear: Status flags to clear.
 290  * @id: Id for debug trace event.
 291  * @ref: Reference for debug trace event.
 292  */
 293 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, u8 id, void *ref)
 294 {
 295         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 296         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 297 }
 298
 299 /**
 300  * zfcp_erp_unit_shutdown - Shutdown unit
 301  * @unit: Unit to shut down.
 302  * @clear: Status flags to clear.
 303  * @id: Id for debug trace event.
 304  * @ref: Reference for debug trace event.
 305  */
 306 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, u8 id, void *ref)
 307 {
 308         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 309         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 310 }
 311
 312 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 313 {
 314         zfcp_erp_modify_port_status(port, 17, NULL,
 315                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 316                                     ZFCP_CLEAR);
 317 }
 318
 319 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 320                                          int clear, u8 id, void *ref)
 321 {
 322         zfcp_erp_port_block(port, clear);
 323
 324         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 325                 return;
 326
 327         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 328                                 port->adapter, port, NULL, id, ref);
 329 }
 330
 331 /**
 332  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 333  * @port: Port to force close and to reopen.
 334  * @id: Id for debug trace event.
 335  * @ref: Reference for debug trace event.
 336  */
 337 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, u8 id,
 338                                  void *ref)
 339 {
 340         unsigned long flags;
 341         struct zfcp_adapter *adapter = port->adapter;
 342
 343         read_lock_irqsave(&zfcp_data.config_lock, flags);
 344         write_lock(&adapter->erp_lock);
 345         _zfcp_erp_port_forced_reopen(port, clear, id, ref);
 346         write_unlock(&adapter->erp_lock);
 347         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 348 }
 349
 350 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, u8 id,
 351                                  void *ref)
 352 {
 353         zfcp_erp_port_block(port, clear);
 354
 355         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 356                 /* ensure propagation of failed status to new devices */
 357                 zfcp_erp_port_failed(port, 14, NULL);
 358                 return -EIO;
 359         }
 360
 361         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 362                                        port->adapter, port, NULL, id, ref);
 363 }
 364
 365 /**
 366  * zfcp_erp_port_reopen - trigger remote port recovery
 367  * @port: port to recover
 368  * @clear_mask: flags in port status to be cleared
 369  *
 370  * Returns 0 if recovery has been triggered, < 0 if not.
 371  */
 372 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, u8 id, void *ref)
 373 {
 374         unsigned long flags;
 375         int retval;
 376         struct zfcp_adapter *adapter = port->adapter;
 377
 378         read_lock_irqsave(&zfcp_data.config_lock, flags);
 379         write_lock(&adapter->erp_lock);
 380         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 381         write_unlock(&adapter->erp_lock);
 382         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 383
 384         return retval;
 385 }
 386
 387 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 388 {
 389         zfcp_erp_modify_unit_status(unit, 19, NULL,
 390                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 391                                     ZFCP_CLEAR);
 392 }
 393
 394 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, u8 id,
 395                                   void *ref)
 396 {
 397         struct zfcp_adapter *adapter = unit->port->adapter;
 398
 399         zfcp_erp_unit_block(unit, clear);
 400
 401         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 402                 return;
 403
 404         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 405                                 adapter, unit->port, unit, id, ref);
 406 }
 407
 408 /**
 409  * zfcp_erp_unit_reopen - initiate reopen of a unit
 410  * @unit: unit to be reopened
 411  * @clear_mask: specifies flags in unit status to be cleared
 412  * Return: 0 on success, < 0 on error
 413  */
 414 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, u8 id, void *ref)
 415 {
 416         unsigned long flags;
 417         struct zfcp_port *port = unit->port;
 418         struct zfcp_adapter *adapter = port->adapter;
 419
 420         read_lock_irqsave(&zfcp_data.config_lock, flags);
 421         write_lock(&adapter->erp_lock);
 422         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 423         write_unlock(&adapter->erp_lock);
 424         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 425 }
 426
 427 static int status_change_set(unsigned long mask, atomic_t *status)
 428 {
 429         return (atomic_read(status) ^ mask) & mask;
 430 }
 431
 432 static int status_change_clear(unsigned long mask, atomic_t *status)
 433 {
 434         return atomic_read(status) & mask;
 435 }
 436
 437 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 438 {
 439         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 440                 zfcp_rec_dbf_event_adapter(16, NULL, adapter);
 441         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 442 }
 443
 444 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 445 {
 446         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 447                 zfcp_rec_dbf_event_port(18, NULL, port);
 448         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 449 }
 450
 451 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 452 {
 453         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 454                 zfcp_rec_dbf_event_unit(20, NULL, unit);
 455         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 456 }
 457
 458 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 459 {
 460         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 461         zfcp_rec_dbf_event_action(145, erp_action);
 462 }
 463
 464 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 465 {
 466         struct zfcp_adapter *adapter = act->adapter;
 467
 468         if (!act->fsf_req)
 469                 return;
 470
 471         spin_lock(&adapter->req_list_lock);
 472         if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
 473             act->fsf_req->erp_action == act) {
 474                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 475                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 476                         act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 477                         zfcp_rec_dbf_event_action(142, act);
 478                         act->fsf_req->erp_action = NULL;
 479                 }
 480                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 481                         zfcp_rec_dbf_event_action(143, act);
 482                 if (act->fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
 483                                             ZFCP_STATUS_FSFREQ_DISMISSED))
 484                         act->fsf_req = NULL;
 485         } else
 486                 act->fsf_req = NULL;
 487         spin_unlock(&adapter->req_list_lock);
 488 }
 489
 490 /**
 491  * zfcp_erp_notify - Trigger ERP action.
 492  * @erp_action: ERP action to continue.
 493  * @set_mask: ERP action status flags to set.
 494  */
 495 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 496 {
 497         struct zfcp_adapter *adapter = erp_action->adapter;
 498         unsigned long flags;
 499
 500         write_lock_irqsave(&adapter->erp_lock, flags);
 501         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 502                 erp_action->status |= set_mask;
 503                 zfcp_erp_action_ready(erp_action);
 504         }
 505         write_unlock_irqrestore(&adapter->erp_lock, flags);
 506 }
 507
 508 /**
 509  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 510  * @data: ERP action (from timer data)
 511  */
 512 void zfcp_erp_timeout_handler(unsigned long data)
 513 {
 514         struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
 515         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 516 }
 517
 518 static void zfcp_erp_memwait_handler(unsigned long data)
 519 {
 520         zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
 521 }
 522
 523 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 524 {
 525         init_timer(&erp_action->timer);
 526         erp_action->timer.function = zfcp_erp_memwait_handler;
 527         erp_action->timer.data = (unsigned long) erp_action;
 528         erp_action->timer.expires = jiffies + HZ;
 529         add_timer(&erp_action->timer);
 530 }
 531
 532 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 533                                       int clear, u8 id, void *ref)
 534 {
 535         struct zfcp_port *port;
 536
 537         list_for_each_entry(port, &adapter->port_list_head, list)
 538                 _zfcp_erp_port_reopen(port, clear, id, ref);
 539 }
 540
 541 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear, u8 id,
 542                                       void *ref)
 543 {
 544         struct zfcp_unit *unit;
 545
 546         list_for_each_entry(unit, &port->unit_list_head, list)
 547                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 548 }
 549
 550 static void zfcp_erp_strategy_followup_actions(struct zfcp_erp_action *act)
 551 {
 552         struct zfcp_adapter *adapter = act->adapter;
 553         struct zfcp_port *port = act->port;
 554         struct zfcp_unit *unit = act->unit;
 555         u32 status = act->status;
 556
 557         /* initiate follow-up actions depending on success of finished action */
 558         switch (act->action) {
 559
 560         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 561                 if (status == ZFCP_ERP_SUCCEEDED)
 562                         _zfcp_erp_port_reopen_all(adapter, 0, 70, NULL);
 563                 else
 564                         _zfcp_erp_adapter_reopen(adapter, 0, 71, NULL);
 565                 break;
 566
 567         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 568                 if (status == ZFCP_ERP_SUCCEEDED)
 569                         _zfcp_erp_port_reopen(port, 0, 72, NULL);
 570                 else
 571                         _zfcp_erp_adapter_reopen(adapter, 0, 73, NULL);
 572                 break;
 573
 574         case ZFCP_ERP_ACTION_REOPEN_PORT:
 575                 if (status == ZFCP_ERP_SUCCEEDED)
 576                         _zfcp_erp_unit_reopen_all(port, 0, 74, NULL);
 577                 else
 578                         _zfcp_erp_port_forced_reopen(port, 0, 75, NULL);
 579                 break;
 580
 581         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 582                 if (status != ZFCP_ERP_SUCCEEDED)
 583                         _zfcp_erp_port_reopen(unit->port, 0, 76, NULL);
 584                 break;
 585         }
 586 }
 587
 588 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 589 {
 590         unsigned long flags;
 591
 592         read_lock_irqsave(&zfcp_data.config_lock, flags);
 593         read_lock(&adapter->erp_lock);
 594         if (list_empty(&adapter->erp_ready_head) &&
 595             list_empty(&adapter->erp_running_head)) {
 596                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 597                                           &adapter->status);
 598                         wake_up(&adapter->erp_done_wqh);
 599         }
 600         read_unlock(&adapter->erp_lock);
 601         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 602 }
 603
 604 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 605 {
 606         if (zfcp_qdio_open(act->adapter))
 607                 return ZFCP_ERP_FAILED;
 608         init_waitqueue_head(&act->adapter->request_wq);
 609         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 610         return ZFCP_ERP_SUCCEEDED;
 611 }
 612
 613 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 614 {
 615         struct zfcp_port *port;
 616         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 617                                  adapter->peer_d_id);
 618         if (IS_ERR(port)) /* error or port already attached */
 619                 return;
 620         _zfcp_erp_port_reopen(port, 0, 150, NULL);
 621 }
 622
 623 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 624 {
 625         int retries;
 626         int sleep = 1;
 627         struct zfcp_adapter *adapter = erp_action->adapter;
 628
 629         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 630
 631         for (retries = 7; retries; retries--) {
 632                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 633                                   &adapter->status);
 634                 write_lock_irq(&adapter->erp_lock);
 635                 zfcp_erp_action_to_running(erp_action);
 636                 write_unlock_irq(&adapter->erp_lock);
 637                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 638                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 639                                           &adapter->status);
 640                         return ZFCP_ERP_FAILED;
 641                 }
 642
 643                 zfcp_rec_dbf_event_thread_lock(6, adapter);
 644                 down(&adapter->erp_ready_sem);
 645                 zfcp_rec_dbf_event_thread_lock(7, adapter);
 646                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 647                         break;
 648
 649                 if (!(atomic_read(&adapter->status) &
 650                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 651                         break;
 652
 653                 ssleep(sleep);
 654                 sleep *= 2;
 655         }
 656
 657         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 658                           &adapter->status);
 659
 660         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 661                 return ZFCP_ERP_FAILED;
 662
 663         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 664                 zfcp_erp_enqueue_ptp_port(adapter);
 665
 666         return ZFCP_ERP_SUCCEEDED;
 667 }
 668
 669 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 670 {
 671         int ret;
 672         struct zfcp_adapter *adapter = act->adapter;
 673
 674         write_lock_irq(&adapter->erp_lock);
 675         zfcp_erp_action_to_running(act);
 676         write_unlock_irq(&adapter->erp_lock);
 677
 678         ret = zfcp_fsf_exchange_port_data(act);
 679         if (ret == -EOPNOTSUPP)
 680                 return ZFCP_ERP_SUCCEEDED;
 681         if (ret)
 682                 return ZFCP_ERP_FAILED;
 683
 684         zfcp_rec_dbf_event_thread_lock(8, adapter);
 685         down(&adapter->erp_ready_sem);
 686         zfcp_rec_dbf_event_thread_lock(9, adapter);
 687         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 688                 return ZFCP_ERP_FAILED;
 689
 690         return ZFCP_ERP_SUCCEEDED;
 691 }
 692
 693 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 694 {
 695         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 696                 return ZFCP_ERP_FAILED;
 697
 698         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 699                 return ZFCP_ERP_FAILED;
 700
 701         atomic_set(&act->adapter->stat_miss, 16);
 702         if (zfcp_status_read_refill(act->adapter))
 703                 return ZFCP_ERP_FAILED;
 704
 705         return ZFCP_ERP_SUCCEEDED;
 706 }
 707
 708 static int zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *act,
 709                                              int close)
 710 {
 711         int retval = ZFCP_ERP_SUCCEEDED;
 712         struct zfcp_adapter *adapter = act->adapter;
 713
 714         if (close)
 715                 goto close_only;
 716
 717         retval = zfcp_erp_adapter_strategy_open_qdio(act);
 718         if (retval != ZFCP_ERP_SUCCEEDED)
 719                 goto failed_qdio;
 720
 721         retval = zfcp_erp_adapter_strategy_open_fsf(act);
 722         if (retval != ZFCP_ERP_SUCCEEDED)
 723                 goto failed_openfcp;
 724
 725         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &act->adapter->status);
 726
 727         return ZFCP_ERP_SUCCEEDED;
 728
 729  close_only:
 730         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
 731                           &act->adapter->status);
 732
 733  failed_openfcp:
 734         /* close queues to ensure that buffers are not accessed by adapter */
 735         zfcp_qdio_close(adapter);
 736         zfcp_fsf_req_dismiss_all(adapter);
 737         adapter->fsf_req_seq_no = 0;
 738         /* all ports and units are closed */
 739         zfcp_erp_modify_adapter_status(adapter, 24, NULL,
 740                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 741  failed_qdio:
 742         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 743                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 744                           &act->adapter->status);
 745         return retval;
 746 }
 747
 748 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 749 {
 750         int retval;
 751
 752         zfcp_erp_adapter_strategy_generic(act, 1); /* close */
 753         if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 754                 return ZFCP_ERP_EXIT;
 755
 756         retval = zfcp_erp_adapter_strategy_generic(act, 0); /* open */
 757
 758         if (retval == ZFCP_ERP_FAILED)
 759                 ssleep(8);
 760
 761         return retval;
 762 }
 763
 764 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 765 {
 766         int retval;
 767
 768         retval = zfcp_fsf_close_physical_port(act);
 769         if (retval == -ENOMEM)
 770                 return ZFCP_ERP_NOMEM;
 771         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 772         if (retval)
 773                 return ZFCP_ERP_FAILED;
 774
 775         return ZFCP_ERP_CONTINUES;
 776 }
 777
 778 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 779 {
 780         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 781                           ZFCP_STATUS_PORT_PHYS_CLOSING |
 782                           ZFCP_STATUS_PORT_INVALID_WWPN,
 783                           &port->status);
 784 }
 785
 786 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 787 {
 788         struct zfcp_port *port = erp_action->port;
 789         int status = atomic_read(&port->status);
 790
 791         switch (erp_action->step) {
 792         case ZFCP_ERP_STEP_UNINITIALIZED:
 793                 zfcp_erp_port_strategy_clearstati(port);
 794                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 795                     (status & ZFCP_STATUS_COMMON_OPEN))
 796                         return zfcp_erp_port_forced_strategy_close(erp_action);
 797                 else
 798                         return ZFCP_ERP_FAILED;
 799
 800         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 801                 if (status & ZFCP_STATUS_PORT_PHYS_OPEN)
 802                         return ZFCP_ERP_SUCCEEDED;
 803         }
 804         return ZFCP_ERP_FAILED;
 805 }
 806
 807 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 808 {
 809         int retval;
 810
 811         retval = zfcp_fsf_close_port(erp_action);
 812         if (retval == -ENOMEM)
 813                 return ZFCP_ERP_NOMEM;
 814         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 815         if (retval)
 816                 return ZFCP_ERP_FAILED;
 817         return ZFCP_ERP_CONTINUES;
 818 }
 819
 820 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 821 {
 822         int retval;
 823
 824         retval = zfcp_fsf_open_port(erp_action);
 825         if (retval == -ENOMEM)
 826                 return ZFCP_ERP_NOMEM;
 827         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 828         if (retval)
 829                 return ZFCP_ERP_FAILED;
 830         return ZFCP_ERP_CONTINUES;
 831 }
 832
 833 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 834 {
 835         struct zfcp_adapter *adapter = act->adapter;
 836         struct zfcp_port *port = act->port;
 837
 838         if (port->wwpn != adapter->peer_wwpn) {
 839                 zfcp_erp_port_failed(port, 25, NULL);
 840                 return ZFCP_ERP_FAILED;
 841         }
 842         port->d_id = adapter->peer_d_id;
 843         return zfcp_erp_port_strategy_open_port(act);
 844 }
 845
 846 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
 847 {
 848         int retval;
 849         struct zfcp_port *port = container_of(work, struct zfcp_port,
 850                                               gid_pn_work);
 851
 852         retval = zfcp_fc_ns_gid_pn(&port->erp_action);
 853         if (retval == -ENOMEM)
 854                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_NOMEM);
 855         port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
 856         if (retval)
 857                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_FAILED);
 858
 859 }
 860
 861 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 862 {
 863         struct zfcp_adapter *adapter = act->adapter;
 864         struct zfcp_port *port = act->port;
 865         int p_status = atomic_read(&port->status);
 866
 867         switch (act->step) {
 868         case ZFCP_ERP_STEP_UNINITIALIZED:
 869         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 870         case ZFCP_ERP_STEP_PORT_CLOSING:
 871                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 872                         return zfcp_erp_open_ptp_port(act);
 873                 if (!port->d_id) {
 874                         queue_work(zfcp_data.work_queue, &port->gid_pn_work);
 875                         return ZFCP_ERP_CONTINUES;
 876                 }
 877         case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
 878                 if (!port->d_id) {
 879                         if (p_status & (ZFCP_STATUS_PORT_INVALID_WWPN)) {
 880                                 zfcp_erp_port_failed(port, 26, NULL);
 881                                 return ZFCP_ERP_EXIT;
 882                         }
 883                         return ZFCP_ERP_FAILED;
 884                 }
 885                 return zfcp_erp_port_strategy_open_port(act);
 886
 887         case ZFCP_ERP_STEP_PORT_OPENING:
 888                 /* D_ID might have changed during open */
 889                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 890                         if (port->d_id)
 891                                 return ZFCP_ERP_SUCCEEDED;
 892                         else {
 893                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 894                                 return ZFCP_ERP_CONTINUES;
 895                         }
 896                 /* fall through otherwise */
 897                 }
 898         }
 899         return ZFCP_ERP_FAILED;
 900 }
 901
 902 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 903 {
 904         struct zfcp_port *port = erp_action->port;
 905
 906         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 907                 goto close_init_done;
 908
 909         switch (erp_action->step) {
 910         case ZFCP_ERP_STEP_UNINITIALIZED:
 911                 zfcp_erp_port_strategy_clearstati(port);
 912                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 913                         return zfcp_erp_port_strategy_close(erp_action);
 914                 break;
 915
 916         case ZFCP_ERP_STEP_PORT_CLOSING:
 917                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 918                         return ZFCP_ERP_FAILED;
 919                 break;
 920         }
 921
 922 close_init_done:
 923         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 924                 return ZFCP_ERP_EXIT;
 925
 926         return zfcp_erp_port_strategy_open_common(erp_action);
 927 }
 928
 929 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 930 {
 931         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 932                           ZFCP_STATUS_UNIT_SHARED |
 933                           ZFCP_STATUS_UNIT_READONLY,
 934                           &unit->status);
 935 }
 936
 937 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 938 {
 939         int retval = zfcp_fsf_close_unit(erp_action);
 940         if (retval == -ENOMEM)
 941                 return ZFCP_ERP_NOMEM;
 942         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 943         if (retval)
 944                 return ZFCP_ERP_FAILED;
 945         return ZFCP_ERP_CONTINUES;
 946 }
 947
 948 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 949 {
 950         int retval = zfcp_fsf_open_unit(erp_action);
 951         if (retval == -ENOMEM)
 952                 return ZFCP_ERP_NOMEM;
 953         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 954         if (retval)
 955                 return  ZFCP_ERP_FAILED;
 956         return ZFCP_ERP_CONTINUES;
 957 }
 958
 959 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 960 {
 961         struct zfcp_unit *unit = erp_action->unit;
 962
 963         switch (erp_action->step) {
 964         case ZFCP_ERP_STEP_UNINITIALIZED:
 965                 zfcp_erp_unit_strategy_clearstati(unit);
 966                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 967                         return zfcp_erp_unit_strategy_close(erp_action);
 968                 /* already closed, fall through */
 969         case ZFCP_ERP_STEP_UNIT_CLOSING:
 970                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 971                         return ZFCP_ERP_FAILED;
 972                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 973                         return ZFCP_ERP_EXIT;
 974                 return zfcp_erp_unit_strategy_open(erp_action);
 975
 976         case ZFCP_ERP_STEP_UNIT_OPENING:
 977                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 978                         return ZFCP_ERP_SUCCEEDED;
 979         }
 980         return ZFCP_ERP_FAILED;
 981 }
 982
 983 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 984 {
 985         switch (result) {
 986         case ZFCP_ERP_SUCCEEDED :
 987                 atomic_set(&unit->erp_counter, 0);
 988                 zfcp_erp_unit_unblock(unit);
 989                 break;
 990         case ZFCP_ERP_FAILED :
 991                 atomic_inc(&unit->erp_counter);
 992                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
 993                         dev_err(&unit->port->adapter->ccw_device->dev,
 994                                 "ERP failed for unit 0x%016Lx on "
 995                                 "port 0x%016Lx\n",
 996                                 (unsigned long long)unit->fcp_lun,
 997                                 (unsigned long long)unit->port->wwpn);
 998                         zfcp_erp_unit_failed(unit, 21, NULL);
 999                 }
1000                 break;
1001         }
1002
1003         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1004                 zfcp_erp_unit_block(unit, 0);
1005                 result = ZFCP_ERP_EXIT;
1006         }
1007         return result;
1008 }
1009
1010 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1011 {
1012         switch (result) {
1013         case ZFCP_ERP_SUCCEEDED :
1014                 atomic_set(&port->erp_counter, 0);
1015                 zfcp_erp_port_unblock(port);
1016                 break;
1017
1018         case ZFCP_ERP_FAILED :
1019                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1020                         zfcp_erp_port_block(port, 0);
1021                         result = ZFCP_ERP_EXIT;
1022                 }
1023                 atomic_inc(&port->erp_counter);
1024                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1025                         dev_err(&port->adapter->ccw_device->dev,
1026                                 "ERP failed for remote port 0x%016Lx\n",
1027                                 (unsigned long long)port->wwpn);
1028                         zfcp_erp_port_failed(port, 22, NULL);
1029                 }
1030                 break;
1031         }
1032
1033         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1034                 zfcp_erp_port_block(port, 0);
1035                 result = ZFCP_ERP_EXIT;
1036         }
1037         return result;
1038 }
1039
1040 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1041                                            int result)
1042 {
1043         switch (result) {
1044         case ZFCP_ERP_SUCCEEDED :
1045                 atomic_set(&adapter->erp_counter, 0);
1046                 zfcp_erp_adapter_unblock(adapter);
1047                 break;
1048
1049         case ZFCP_ERP_FAILED :
1050                 atomic_inc(&adapter->erp_counter);
1051                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1052                         dev_err(&adapter->ccw_device->dev,
1053                                 "ERP cannot recover an error "
1054                                 "on the FCP device\n");
1055                         zfcp_erp_adapter_failed(adapter, 23, NULL);
1056                 }
1057                 break;
1058         }
1059
1060         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1061                 zfcp_erp_adapter_block(adapter, 0);
1062                 result = ZFCP_ERP_EXIT;
1063         }
1064         return result;
1065 }
1066
1067 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1068                                           int result)
1069 {
1070         struct zfcp_adapter *adapter = erp_action->adapter;
1071         struct zfcp_port *port = erp_action->port;
1072         struct zfcp_unit *unit = erp_action->unit;
1073
1074         switch (erp_action->action) {
1075
1076         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1077                 result = zfcp_erp_strategy_check_unit(unit, result);
1078                 break;
1079
1080         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1081         case ZFCP_ERP_ACTION_REOPEN_PORT:
1082                 result = zfcp_erp_strategy_check_port(port, result);
1083                 break;
1084
1085         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1086                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1087                 break;
1088         }
1089         return result;
1090 }
1091
1092 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1093 {
1094         int status = atomic_read(target_status);
1095
1096         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1097             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1098                 return 1; /* take it online */
1099
1100         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1101             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1102                 return 1; /* take it offline */
1103
1104         return 0;
1105 }
1106
1107 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1108 {
1109         int action = act->action;
1110         struct zfcp_adapter *adapter = act->adapter;
1111         struct zfcp_port *port = act->port;
1112         struct zfcp_unit *unit = act->unit;
1113         u32 erp_status = act->status;
1114
1115         switch (action) {
1116         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1117                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1118                         _zfcp_erp_adapter_reopen(adapter,
1119                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1120                                                  67, NULL);
1121                         return ZFCP_ERP_EXIT;
1122                 }
1123                 break;
1124
1125         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1126         case ZFCP_ERP_ACTION_REOPEN_PORT:
1127                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1128                         _zfcp_erp_port_reopen(port,
1129                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1130                                               68, NULL);
1131                         return ZFCP_ERP_EXIT;
1132                 }
1133                 break;
1134
1135         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1136                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1137                         _zfcp_erp_unit_reopen(unit,
1138                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1139                                               69, NULL);
1140                         return ZFCP_ERP_EXIT;
1141                 }
1142                 break;
1143         }
1144         return ret;
1145 }
1146
1147 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1148 {
1149         struct zfcp_adapter *adapter = erp_action->adapter;
1150
1151         adapter->erp_total_count--;
1152         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1153                 adapter->erp_low_mem_count--;
1154                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1155         }
1156
1157         list_del(&erp_action->list);
1158         zfcp_rec_dbf_event_action(144, erp_action);
1159
1160         switch (erp_action->action) {
1161         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1162                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1163                                   &erp_action->unit->status);
1164                 break;
1165
1166         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1167         case ZFCP_ERP_ACTION_REOPEN_PORT:
1168                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1169                                   &erp_action->port->status);
1170                 break;
1171
1172         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1173                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1174                                   &erp_action->adapter->status);
1175                 break;
1176         }
1177 }
1178
1179 struct zfcp_erp_add_work {
1180         struct zfcp_unit  *unit;
1181         struct work_struct work;
1182 };
1183
1184 static void zfcp_erp_scsi_scan(struct work_struct *work)
1185 {
1186         struct zfcp_erp_add_work *p =
1187                 container_of(work, struct zfcp_erp_add_work, work);
1188         struct zfcp_unit *unit = p->unit;
1189         struct fc_rport *rport = unit->port->rport;
1190
1191         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
1192                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
1193                          scsilun_to_int((struct scsi_lun *)&unit->fcp_lun), 0);
1194         atomic_clear_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1195         zfcp_unit_put(unit);
1196         wake_up(&unit->port->adapter->erp_done_wqh);
1197         kfree(p);
1198 }
1199
1200 static void zfcp_erp_schedule_work(struct zfcp_unit *unit)
1201 {
1202         struct zfcp_erp_add_work *p;
1203
1204         p = kzalloc(sizeof(*p), GFP_KERNEL);
1205         if (!p) {
1206                 dev_err(&unit->port->adapter->ccw_device->dev,
1207                         "Registering unit 0x%016Lx on port 0x%016Lx failed\n",
1208                         (unsigned long long)unit->fcp_lun,
1209                         (unsigned long long)unit->port->wwpn);
1210                 return;
1211         }
1212
1213         zfcp_unit_get(unit);
1214         atomic_set_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1215         INIT_WORK(&p->work, zfcp_erp_scsi_scan);
1216         p->unit = unit;
1217         queue_work(zfcp_data.work_queue, &p->work);
1218 }
1219
1220 static void zfcp_erp_rport_register(struct zfcp_port *port)
1221 {
1222         struct fc_rport_identifiers ids;
1223         ids.node_name = port->wwnn;
1224         ids.port_name = port->wwpn;
1225         ids.port_id = port->d_id;
1226         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
1227         port->rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
1228         if (!port->rport) {
1229                 dev_err(&port->adapter->ccw_device->dev,
1230                         "Registering port 0x%016Lx failed\n",
1231                         (unsigned long long)port->wwpn);
1232                 return;
1233         }
1234
1235         scsi_target_unblock(&port->rport->dev);
1236         port->rport->maxframe_size = port->maxframe_size;
1237         port->rport->supported_classes = port->supported_classes;
1238 }
1239
1240 static void zfcp_erp_rports_del(struct zfcp_adapter *adapter)
1241 {
1242         struct zfcp_port *port;
1243         list_for_each_entry(port, &adapter->port_list_head, list) {
1244                 if (!port->rport)
1245                         continue;
1246                 fc_remote_port_delete(port->rport);
1247                 port->rport = NULL;
1248         }
1249 }
1250
1251 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1252 {
1253         struct zfcp_adapter *adapter = act->adapter;
1254         struct zfcp_port *port = act->port;
1255         struct zfcp_unit *unit = act->unit;
1256
1257         switch (act->action) {
1258         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1259                 if ((result == ZFCP_ERP_SUCCEEDED) &&
1260                     !unit->device && port->rport) {
1261                         atomic_set_mask(ZFCP_STATUS_UNIT_REGISTERED,
1262                                         &unit->status);
1263                         if (!(atomic_read(&unit->status) &
1264                               ZFCP_STATUS_UNIT_SCSI_WORK_PENDING))
1265                                 zfcp_erp_schedule_work(unit);
1266                 }
1267                 zfcp_unit_put(unit);
1268                 break;
1269
1270         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1271         case ZFCP_ERP_ACTION_REOPEN_PORT:
1272                 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_NO_WWPN) {
1273                         zfcp_port_put(port);
1274                         return;
1275                 }
1276                 if ((result == ZFCP_ERP_SUCCEEDED) && !port->rport)
1277                         zfcp_erp_rport_register(port);
1278                 if ((result != ZFCP_ERP_SUCCEEDED) && port->rport) {
1279                         fc_remote_port_delete(port->rport);
1280                         port->rport = NULL;
1281                 }
1282                 zfcp_port_put(port);
1283                 break;
1284
1285         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1286                 if (result != ZFCP_ERP_SUCCEEDED) {
1287                         unregister_service_level(&adapter->service_level);
1288                         zfcp_erp_rports_del(adapter);
1289                 } else {
1290                         register_service_level(&adapter->service_level);
1291                         schedule_work(&adapter->scan_work);
1292                 }
1293                 zfcp_adapter_put(adapter);
1294                 break;
1295         }
1296 }
1297
1298 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1299 {
1300         switch (erp_action->action) {
1301         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1302                 return zfcp_erp_adapter_strategy(erp_action);
1303         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1304                 return zfcp_erp_port_forced_strategy(erp_action);
1305         case ZFCP_ERP_ACTION_REOPEN_PORT:
1306                 return zfcp_erp_port_strategy(erp_action);
1307         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1308                 return zfcp_erp_unit_strategy(erp_action);
1309         }
1310         return ZFCP_ERP_FAILED;
1311 }
1312
1313 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1314 {
1315         int retval;
1316         struct zfcp_adapter *adapter = erp_action->adapter;
1317         unsigned long flags;
1318
1319         read_lock_irqsave(&zfcp_data.config_lock, flags);
1320         write_lock(&adapter->erp_lock);
1321
1322         zfcp_erp_strategy_check_fsfreq(erp_action);
1323
1324         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1325                 zfcp_erp_action_dequeue(erp_action);
1326                 retval = ZFCP_ERP_DISMISSED;
1327                 goto unlock;
1328         }
1329
1330         zfcp_erp_action_to_running(erp_action);
1331
1332         /* no lock to allow for blocking operations */
1333         write_unlock(&adapter->erp_lock);
1334         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1335         retval = zfcp_erp_strategy_do_action(erp_action);
1336         read_lock_irqsave(&zfcp_data.config_lock, flags);
1337         write_lock(&adapter->erp_lock);
1338
1339         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1340                 retval = ZFCP_ERP_CONTINUES;
1341
1342         switch (retval) {
1343         case ZFCP_ERP_NOMEM:
1344                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1345                         ++adapter->erp_low_mem_count;
1346                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1347                 }
1348                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1349                         _zfcp_erp_adapter_reopen(adapter, 0, 66, NULL);
1350                 else {
1351                         zfcp_erp_strategy_memwait(erp_action);
1352                         retval = ZFCP_ERP_CONTINUES;
1353                 }
1354                 goto unlock;
1355
1356         case ZFCP_ERP_CONTINUES:
1357                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1358                         --adapter->erp_low_mem_count;
1359                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1360                 }
1361                 goto unlock;
1362         }
1363
1364         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1365         zfcp_erp_action_dequeue(erp_action);
1366         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1367         if (retval == ZFCP_ERP_EXIT)
1368                 goto unlock;
1369         zfcp_erp_strategy_followup_actions(erp_action);
1370
1371  unlock:
1372         write_unlock(&adapter->erp_lock);
1373         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1374
1375         if (retval != ZFCP_ERP_CONTINUES)
1376                 zfcp_erp_action_cleanup(erp_action, retval);
1377
1378         return retval;
1379 }
1380
1381 static int zfcp_erp_thread(void *data)
1382 {
1383         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1384         struct list_head *next;
1385         struct zfcp_erp_action *act;
1386         unsigned long flags;
1387         int ignore;
1388
1389         daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1390         /* Block all signals */
1391         siginitsetinv(&current->blocked, 0);
1392         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1393         wake_up(&adapter->erp_thread_wqh);
1394
1395         while (!(atomic_read(&adapter->status) &
1396                  ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1397                 write_lock_irqsave(&adapter->erp_lock, flags);
1398                 next = adapter->erp_ready_head.next;
1399                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1400
1401                 if (next != &adapter->erp_ready_head) {
1402                         act = list_entry(next, struct zfcp_erp_action, list);
1403
1404                         /* there is more to come after dismission, no notify */
1405                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1406                                 zfcp_erp_wakeup(adapter);
1407                 }
1408
1409                 zfcp_rec_dbf_event_thread_lock(4, adapter);
1410                 ignore = down_interruptible(&adapter->erp_ready_sem);
1411                 zfcp_rec_dbf_event_thread_lock(5, adapter);
1412         }
1413
1414         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1415         wake_up(&adapter->erp_thread_wqh);
1416
1417         return 0;
1418 }
1419
1420 /**
1421  * zfcp_erp_thread_setup - Start ERP thread for adapter
1422  * @adapter: Adapter to start the ERP thread for
1423  *
1424  * Returns 0 on success or error code from kernel_thread()
1425  */
1426 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1427 {
1428         int retval;
1429
1430         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1431         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1432         if (retval < 0) {
1433                 dev_err(&adapter->ccw_device->dev,
1434                         "Creating an ERP thread for the FCP device failed.\n");
1435                 return retval;
1436         }
1437         wait_event(adapter->erp_thread_wqh,
1438                    atomic_read(&adapter->status) &
1439                         ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1440         return 0;
1441 }
1442
1443 /**
1444  * zfcp_erp_thread_kill - Stop ERP thread.
1445  * @adapter: Adapter where the ERP thread should be stopped.
1446  *
1447  * The caller of this routine ensures that the specified adapter has
1448  * been shut down and that this operation has been completed. Thus,
1449  * there are no pending erp_actions which would need to be handled
1450  * here.
1451  */
1452 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1453 {
1454         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1455         up(&adapter->erp_ready_sem);
1456         zfcp_rec_dbf_event_thread_lock(3, adapter);
1457
1458         wait_event(adapter->erp_thread_wqh,
1459                    !(atomic_read(&adapter->status) &
1460                                 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1461
1462         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1463                           &adapter->status);
1464 }
1465
1466 /**
1467  * zfcp_erp_adapter_failed - Set adapter status to failed.
1468  * @adapter: Failed adapter.
1469  * @id: Event id for debug trace.
1470  * @ref: Reference for debug trace.
1471  */
1472 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, u8 id, void *ref)
1473 {
1474         zfcp_erp_modify_adapter_status(adapter, id, ref,
1475                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1476 }
1477
1478 /**
1479  * zfcp_erp_port_failed - Set port status to failed.
1480  * @port: Failed port.
1481  * @id: Event id for debug trace.
1482  * @ref: Reference for debug trace.
1483  */
1484 void zfcp_erp_port_failed(struct zfcp_port *port, u8 id, void *ref)
1485 {
1486         zfcp_erp_modify_port_status(port, id, ref,
1487                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1488 }
1489
1490 /**
1491  * zfcp_erp_unit_failed - Set unit status to failed.
1492  * @unit: Failed unit.
1493  * @id: Event id for debug trace.
1494  * @ref: Reference for debug trace.
1495  */
1496 void zfcp_erp_unit_failed(struct zfcp_unit *unit, u8 id, void *ref)
1497 {
1498         zfcp_erp_modify_unit_status(unit, id, ref,
1499                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1500 }
1501
1502 /**
1503  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1504  * @adapter: adapter for which to wait for completion of its error recovery
1505  */
1506 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1507 {
1508         wait_event(adapter->erp_done_wqh,
1509                    !(atomic_read(&adapter->status) &
1510                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1511 }
1512
1513 /**
1514  * zfcp_erp_modify_adapter_status - change adapter status bits
1515  * @adapter: adapter to change the status
1516  * @id: id for the debug trace
1517  * @ref: reference for the debug trace
1518  * @mask: status bits to change
1519  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1520  *
1521  * Changes in common status bits are propagated to attached ports and units.
1522  */
1523 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, u8 id,
1524                                     void *ref, u32 mask, int set_or_clear)
1525 {
1526         struct zfcp_port *port;
1527         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1528
1529         if (set_or_clear == ZFCP_SET) {
1530                 if (status_change_set(mask, &adapter->status))
1531                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1532                 atomic_set_mask(mask, &adapter->status);
1533         } else {
1534                 if (status_change_clear(mask, &adapter->status))
1535                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1536                 atomic_clear_mask(mask, &adapter->status);
1537                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1538                         atomic_set(&adapter->erp_counter, 0);
1539         }
1540
1541         if (common_mask)
1542                 list_for_each_entry(port, &adapter->port_list_head, list)
1543                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1544                                                     set_or_clear);
1545 }
1546
1547 /**
1548  * zfcp_erp_modify_port_status - change port status bits
1549  * @port: port to change the status bits
1550  * @id: id for the debug trace
1551  * @ref: reference for the debug trace
1552  * @mask: status bits to change
1553  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1554  *
1555  * Changes in common status bits are propagated to attached units.
1556  */
1557 void zfcp_erp_modify_port_status(struct zfcp_port *port, u8 id, void *ref,
1558                                  u32 mask, int set_or_clear)
1559 {
1560         struct zfcp_unit *unit;
1561         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1562
1563         if (set_or_clear == ZFCP_SET) {
1564                 if (status_change_set(mask, &port->status))
1565                         zfcp_rec_dbf_event_port(id, ref, port);
1566                 atomic_set_mask(mask, &port->status);
1567         } else {
1568                 if (status_change_clear(mask, &port->status))
1569                         zfcp_rec_dbf_event_port(id, ref, port);
1570                 atomic_clear_mask(mask, &port->status);
1571                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1572                         atomic_set(&port->erp_counter, 0);
1573         }
1574
1575         if (common_mask)
1576                 list_for_each_entry(unit, &port->unit_list_head, list)
1577                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1578                                                     set_or_clear);
1579 }
1580
1581 /**
1582  * zfcp_erp_modify_unit_status - change unit status bits
1583  * @unit: unit to change the status bits
1584  * @id: id for the debug trace
1585  * @ref: reference for the debug trace
1586  * @mask: status bits to change
1587  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1588  */
1589 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, u8 id, void *ref,
1590                                  u32 mask, int set_or_clear)
1591 {
1592         if (set_or_clear == ZFCP_SET) {
1593                 if (status_change_set(mask, &unit->status))
1594                         zfcp_rec_dbf_event_unit(id, ref, unit);
1595                 atomic_set_mask(mask, &unit->status);
1596         } else {
1597                 if (status_change_clear(mask, &unit->status))
1598                         zfcp_rec_dbf_event_unit(id, ref, unit);
1599                 atomic_clear_mask(mask, &unit->status);
1600                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1601                         atomic_set(&unit->erp_counter, 0);
1602                 }
1603         }
1604 }
1605
1606 /**
1607  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1608  * @port: The "boxed" port.
1609  * @id: The debug trace id.
1610  * @id: Reference for the debug trace.
1611  */
1612 void zfcp_erp_port_boxed(struct zfcp_port *port, u8 id, void *ref)
1613 {
1614         unsigned long flags;
1615
1616         read_lock_irqsave(&zfcp_data.config_lock, flags);
1617         zfcp_erp_modify_port_status(port, id, ref,
1618                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1619         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1620         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1621 }
1622
1623 /**
1624  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1625  * @port: The "boxed" unit.
1626  * @id: The debug trace id.
1627  * @id: Reference for the debug trace.
1628  */
1629 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, u8 id, void *ref)
1630 {
1631         zfcp_erp_modify_unit_status(unit, id, ref,
1632                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1633         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1634 }
1635
1636 /**
1637  * zfcp_erp_port_access_denied - Adapter denied access to port.
1638  * @port: port where access has been denied
1639  * @id: id for debug trace
1640  * @ref: reference for debug trace
1641  *
1642  * Since the adapter has denied access, stop using the port and the
1643  * attached units.
1644  */
1645 void zfcp_erp_port_access_denied(struct zfcp_port *port, u8 id, void *ref)
1646 {
1647         unsigned long flags;
1648
1649         read_lock_irqsave(&zfcp_data.config_lock, flags);
1650         zfcp_erp_modify_port_status(port, id, ref,
1651                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1652                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1653         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1654 }
1655
1656 /**
1657  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1658  * @unit: unit where access has been denied
1659  * @id: id for debug trace
1660  * @ref: reference for debug trace
1661  *
1662  * Since the adapter has denied access, stop using the unit.
1663  */
1664 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, u8 id, void *ref)
1665 {
1666         zfcp_erp_modify_unit_status(unit, id, ref,
1667                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1668                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1669 }
1670
1671 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, u8 id,
1672                                          void *ref)
1673 {
1674         int status = atomic_read(&unit->status);
1675         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1676                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1677                 return;
1678
1679         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1680 }
1681
1682 static void zfcp_erp_port_access_changed(struct zfcp_port *port, u8 id,
1683                                          void *ref)
1684 {
1685         struct zfcp_unit *unit;
1686         int status = atomic_read(&port->status);
1687
1688         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1689                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1690                 list_for_each_entry(unit, &port->unit_list_head, list)
1691                                     zfcp_erp_unit_access_changed(unit, id, ref);
1692                 return;
1693         }
1694
1695         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1696 }
1697
1698 /**
1699  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1700  * @adapter: Adapter where the Access Control Table (ACT) changed
1701  * @id: Id for debug trace
1702  * @ref: Reference for debug trace
1703  */
1704 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, u8 id,
1705                                      void *ref)
1706 {
1707         struct zfcp_port *port;
1708         unsigned long flags;
1709
1710         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1711                 return;
1712
1713         read_lock_irqsave(&zfcp_data.config_lock, flags);
1714         list_for_each_entry(port, &adapter->port_list_head, list)
1715                 zfcp_erp_port_access_changed(port, id, ref);
1716         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1717 }