SAFE public projects git trees. - safe/jmp/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, 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, &port->status);
 781 }
 782
 783 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 784 {
 785         struct zfcp_port *port = erp_action->port;
 786         int status = atomic_read(&port->status);
 787
 788         switch (erp_action->step) {
 789         case ZFCP_ERP_STEP_UNINITIALIZED:
 790                 zfcp_erp_port_strategy_clearstati(port);
 791                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 792                     (status & ZFCP_STATUS_COMMON_OPEN))
 793                         return zfcp_erp_port_forced_strategy_close(erp_action);
 794                 else
 795                         return ZFCP_ERP_FAILED;
 796
 797         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 798                 if (status & ZFCP_STATUS_PORT_PHYS_OPEN)
 799                         return ZFCP_ERP_SUCCEEDED;
 800         }
 801         return ZFCP_ERP_FAILED;
 802 }
 803
 804 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 805 {
 806         int retval;
 807
 808         retval = zfcp_fsf_close_port(erp_action);
 809         if (retval == -ENOMEM)
 810                 return ZFCP_ERP_NOMEM;
 811         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 812         if (retval)
 813                 return ZFCP_ERP_FAILED;
 814         return ZFCP_ERP_CONTINUES;
 815 }
 816
 817 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 818 {
 819         int retval;
 820
 821         retval = zfcp_fsf_open_port(erp_action);
 822         if (retval == -ENOMEM)
 823                 return ZFCP_ERP_NOMEM;
 824         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 825         if (retval)
 826                 return ZFCP_ERP_FAILED;
 827         return ZFCP_ERP_CONTINUES;
 828 }
 829
 830 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 831 {
 832         struct zfcp_adapter *adapter = act->adapter;
 833         struct zfcp_port *port = act->port;
 834
 835         if (port->wwpn != adapter->peer_wwpn) {
 836                 zfcp_erp_port_failed(port, 25, NULL);
 837                 return ZFCP_ERP_FAILED;
 838         }
 839         port->d_id = adapter->peer_d_id;
 840         return zfcp_erp_port_strategy_open_port(act);
 841 }
 842
 843 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
 844 {
 845         int retval;
 846         struct zfcp_port *port = container_of(work, struct zfcp_port,
 847                                               gid_pn_work);
 848
 849         retval = zfcp_fc_ns_gid_pn(&port->erp_action);
 850         if (retval == -ENOMEM)
 851                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_NOMEM);
 852         port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
 853         if (retval)
 854                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_FAILED);
 855
 856 }
 857
 858 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 859 {
 860         struct zfcp_adapter *adapter = act->adapter;
 861         struct zfcp_port *port = act->port;
 862         int p_status = atomic_read(&port->status);
 863
 864         switch (act->step) {
 865         case ZFCP_ERP_STEP_UNINITIALIZED:
 866         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 867         case ZFCP_ERP_STEP_PORT_CLOSING:
 868                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 869                         return zfcp_erp_open_ptp_port(act);
 870                 if (!port->d_id) {
 871                         queue_work(zfcp_data.work_queue, &port->gid_pn_work);
 872                         return ZFCP_ERP_CONTINUES;
 873                 }
 874         case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
 875                 if (!port->d_id)
 876                         return ZFCP_ERP_FAILED;
 877                 return zfcp_erp_port_strategy_open_port(act);
 878
 879         case ZFCP_ERP_STEP_PORT_OPENING:
 880                 /* D_ID might have changed during open */
 881                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 882                         if (port->d_id)
 883                                 return ZFCP_ERP_SUCCEEDED;
 884                         else {
 885                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 886                                 return ZFCP_ERP_CONTINUES;
 887                         }
 888                 /* fall through otherwise */
 889                 }
 890         }
 891         return ZFCP_ERP_FAILED;
 892 }
 893
 894 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 895 {
 896         struct zfcp_port *port = erp_action->port;
 897
 898         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 899                 goto close_init_done;
 900
 901         switch (erp_action->step) {
 902         case ZFCP_ERP_STEP_UNINITIALIZED:
 903                 zfcp_erp_port_strategy_clearstati(port);
 904                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 905                         return zfcp_erp_port_strategy_close(erp_action);
 906                 break;
 907
 908         case ZFCP_ERP_STEP_PORT_CLOSING:
 909                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 910                         return ZFCP_ERP_FAILED;
 911                 break;
 912         }
 913
 914 close_init_done:
 915         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 916                 return ZFCP_ERP_EXIT;
 917
 918         return zfcp_erp_port_strategy_open_common(erp_action);
 919 }
 920
 921 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 922 {
 923         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 924                           ZFCP_STATUS_UNIT_SHARED |
 925                           ZFCP_STATUS_UNIT_READONLY,
 926                           &unit->status);
 927 }
 928
 929 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 930 {
 931         int retval = zfcp_fsf_close_unit(erp_action);
 932         if (retval == -ENOMEM)
 933                 return ZFCP_ERP_NOMEM;
 934         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 935         if (retval)
 936                 return ZFCP_ERP_FAILED;
 937         return ZFCP_ERP_CONTINUES;
 938 }
 939
 940 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 941 {
 942         int retval = zfcp_fsf_open_unit(erp_action);
 943         if (retval == -ENOMEM)
 944                 return ZFCP_ERP_NOMEM;
 945         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 946         if (retval)
 947                 return  ZFCP_ERP_FAILED;
 948         return ZFCP_ERP_CONTINUES;
 949 }
 950
 951 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 952 {
 953         struct zfcp_unit *unit = erp_action->unit;
 954
 955         switch (erp_action->step) {
 956         case ZFCP_ERP_STEP_UNINITIALIZED:
 957                 zfcp_erp_unit_strategy_clearstati(unit);
 958                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 959                         return zfcp_erp_unit_strategy_close(erp_action);
 960                 /* already closed, fall through */
 961         case ZFCP_ERP_STEP_UNIT_CLOSING:
 962                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 963                         return ZFCP_ERP_FAILED;
 964                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 965                         return ZFCP_ERP_EXIT;
 966                 return zfcp_erp_unit_strategy_open(erp_action);
 967
 968         case ZFCP_ERP_STEP_UNIT_OPENING:
 969                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 970                         return ZFCP_ERP_SUCCEEDED;
 971         }
 972         return ZFCP_ERP_FAILED;
 973 }
 974
 975 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 976 {
 977         switch (result) {
 978         case ZFCP_ERP_SUCCEEDED :
 979                 atomic_set(&unit->erp_counter, 0);
 980                 zfcp_erp_unit_unblock(unit);
 981                 break;
 982         case ZFCP_ERP_FAILED :
 983                 atomic_inc(&unit->erp_counter);
 984                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
 985                         dev_err(&unit->port->adapter->ccw_device->dev,
 986                                 "ERP failed for unit 0x%016Lx on "
 987                                 "port 0x%016Lx\n",
 988                                 (unsigned long long)unit->fcp_lun,
 989                                 (unsigned long long)unit->port->wwpn);
 990                         zfcp_erp_unit_failed(unit, 21, NULL);
 991                 }
 992                 break;
 993         }
 994
 995         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 996                 zfcp_erp_unit_block(unit, 0);
 997                 result = ZFCP_ERP_EXIT;
 998         }
 999         return result;
1000 }
1001
1002 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1003 {
1004         switch (result) {
1005         case ZFCP_ERP_SUCCEEDED :
1006                 atomic_set(&port->erp_counter, 0);
1007                 zfcp_erp_port_unblock(port);
1008                 break;
1009
1010         case ZFCP_ERP_FAILED :
1011                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1012                         zfcp_erp_port_block(port, 0);
1013                         result = ZFCP_ERP_EXIT;
1014                 }
1015                 atomic_inc(&port->erp_counter);
1016                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1017                         dev_err(&port->adapter->ccw_device->dev,
1018                                 "ERP failed for remote port 0x%016Lx\n",
1019                                 (unsigned long long)port->wwpn);
1020                         zfcp_erp_port_failed(port, 22, NULL);
1021                 }
1022                 break;
1023         }
1024
1025         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1026                 zfcp_erp_port_block(port, 0);
1027                 result = ZFCP_ERP_EXIT;
1028         }
1029         return result;
1030 }
1031
1032 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1033                                            int result)
1034 {
1035         switch (result) {
1036         case ZFCP_ERP_SUCCEEDED :
1037                 atomic_set(&adapter->erp_counter, 0);
1038                 zfcp_erp_adapter_unblock(adapter);
1039                 break;
1040
1041         case ZFCP_ERP_FAILED :
1042                 atomic_inc(&adapter->erp_counter);
1043                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1044                         dev_err(&adapter->ccw_device->dev,
1045                                 "ERP cannot recover an error "
1046                                 "on the FCP device\n");
1047                         zfcp_erp_adapter_failed(adapter, 23, NULL);
1048                 }
1049                 break;
1050         }
1051
1052         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1053                 zfcp_erp_adapter_block(adapter, 0);
1054                 result = ZFCP_ERP_EXIT;
1055         }
1056         return result;
1057 }
1058
1059 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1060                                           int result)
1061 {
1062         struct zfcp_adapter *adapter = erp_action->adapter;
1063         struct zfcp_port *port = erp_action->port;
1064         struct zfcp_unit *unit = erp_action->unit;
1065
1066         switch (erp_action->action) {
1067
1068         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1069                 result = zfcp_erp_strategy_check_unit(unit, result);
1070                 break;
1071
1072         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1073         case ZFCP_ERP_ACTION_REOPEN_PORT:
1074                 result = zfcp_erp_strategy_check_port(port, result);
1075                 break;
1076
1077         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1078                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1079                 break;
1080         }
1081         return result;
1082 }
1083
1084 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1085 {
1086         int status = atomic_read(target_status);
1087
1088         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1089             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1090                 return 1; /* take it online */
1091
1092         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1093             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1094                 return 1; /* take it offline */
1095
1096         return 0;
1097 }
1098
1099 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1100 {
1101         int action = act->action;
1102         struct zfcp_adapter *adapter = act->adapter;
1103         struct zfcp_port *port = act->port;
1104         struct zfcp_unit *unit = act->unit;
1105         u32 erp_status = act->status;
1106
1107         switch (action) {
1108         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1109                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1110                         _zfcp_erp_adapter_reopen(adapter,
1111                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1112                                                  67, NULL);
1113                         return ZFCP_ERP_EXIT;
1114                 }
1115                 break;
1116
1117         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1118         case ZFCP_ERP_ACTION_REOPEN_PORT:
1119                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1120                         _zfcp_erp_port_reopen(port,
1121                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1122                                               68, NULL);
1123                         return ZFCP_ERP_EXIT;
1124                 }
1125                 break;
1126
1127         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1128                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1129                         _zfcp_erp_unit_reopen(unit,
1130                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1131                                               69, NULL);
1132                         return ZFCP_ERP_EXIT;
1133                 }
1134                 break;
1135         }
1136         return ret;
1137 }
1138
1139 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1140 {
1141         struct zfcp_adapter *adapter = erp_action->adapter;
1142
1143         adapter->erp_total_count--;
1144         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1145                 adapter->erp_low_mem_count--;
1146                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1147         }
1148
1149         list_del(&erp_action->list);
1150         zfcp_rec_dbf_event_action(144, erp_action);
1151
1152         switch (erp_action->action) {
1153         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1154                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1155                                   &erp_action->unit->status);
1156                 break;
1157
1158         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1159         case ZFCP_ERP_ACTION_REOPEN_PORT:
1160                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1161                                   &erp_action->port->status);
1162                 break;
1163
1164         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1165                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1166                                   &erp_action->adapter->status);
1167                 break;
1168         }
1169 }
1170
1171 struct zfcp_erp_add_work {
1172         struct zfcp_unit  *unit;
1173         struct work_struct work;
1174 };
1175
1176 static void zfcp_erp_scsi_scan(struct work_struct *work)
1177 {
1178         struct zfcp_erp_add_work *p =
1179                 container_of(work, struct zfcp_erp_add_work, work);
1180         struct zfcp_unit *unit = p->unit;
1181         struct fc_rport *rport = unit->port->rport;
1182
1183         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
1184                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
1185                          scsilun_to_int((struct scsi_lun *)&unit->fcp_lun), 0);
1186         atomic_clear_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1187         zfcp_unit_put(unit);
1188         wake_up(&unit->port->adapter->erp_done_wqh);
1189         kfree(p);
1190 }
1191
1192 static void zfcp_erp_schedule_work(struct zfcp_unit *unit)
1193 {
1194         struct zfcp_erp_add_work *p;
1195
1196         p = kzalloc(sizeof(*p), GFP_KERNEL);
1197         if (!p) {
1198                 dev_err(&unit->port->adapter->ccw_device->dev,
1199                         "Registering unit 0x%016Lx on port 0x%016Lx failed\n",
1200                         (unsigned long long)unit->fcp_lun,
1201                         (unsigned long long)unit->port->wwpn);
1202                 return;
1203         }
1204
1205         zfcp_unit_get(unit);
1206         atomic_set_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1207         INIT_WORK(&p->work, zfcp_erp_scsi_scan);
1208         p->unit = unit;
1209         queue_work(zfcp_data.work_queue, &p->work);
1210 }
1211
1212 static void zfcp_erp_rport_register(struct zfcp_port *port)
1213 {
1214         struct fc_rport_identifiers ids;
1215         ids.node_name = port->wwnn;
1216         ids.port_name = port->wwpn;
1217         ids.port_id = port->d_id;
1218         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
1219         port->rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
1220         if (!port->rport) {
1221                 dev_err(&port->adapter->ccw_device->dev,
1222                         "Registering port 0x%016Lx failed\n",
1223                         (unsigned long long)port->wwpn);
1224                 return;
1225         }
1226
1227         scsi_target_unblock(&port->rport->dev);
1228         port->rport->maxframe_size = port->maxframe_size;
1229         port->rport->supported_classes = port->supported_classes;
1230 }
1231
1232 static void zfcp_erp_rports_del(struct zfcp_adapter *adapter)
1233 {
1234         struct zfcp_port *port;
1235         list_for_each_entry(port, &adapter->port_list_head, list) {
1236                 if (!port->rport)
1237                         continue;
1238                 fc_remote_port_delete(port->rport);
1239                 port->rport = NULL;
1240         }
1241 }
1242
1243 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1244 {
1245         struct zfcp_adapter *adapter = act->adapter;
1246         struct zfcp_port *port = act->port;
1247         struct zfcp_unit *unit = act->unit;
1248
1249         switch (act->action) {
1250         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1251                 if ((result == ZFCP_ERP_SUCCEEDED) &&
1252                     !unit->device && port->rport) {
1253                         if (!(atomic_read(&unit->status) &
1254                               ZFCP_STATUS_UNIT_SCSI_WORK_PENDING))
1255                                 zfcp_erp_schedule_work(unit);
1256                 }
1257                 zfcp_unit_put(unit);
1258                 break;
1259
1260         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1261         case ZFCP_ERP_ACTION_REOPEN_PORT:
1262                 if ((result == ZFCP_ERP_SUCCEEDED) && !port->rport)
1263                         zfcp_erp_rport_register(port);
1264                 if ((result != ZFCP_ERP_SUCCEEDED) && port->rport) {
1265                         fc_remote_port_delete(port->rport);
1266                         port->rport = NULL;
1267                 }
1268                 zfcp_port_put(port);
1269                 break;
1270
1271         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1272                 if (result != ZFCP_ERP_SUCCEEDED) {
1273                         unregister_service_level(&adapter->service_level);
1274                         zfcp_erp_rports_del(adapter);
1275                 } else {
1276                         register_service_level(&adapter->service_level);
1277                         schedule_work(&adapter->scan_work);
1278                 }
1279                 zfcp_adapter_put(adapter);
1280                 break;
1281         }
1282 }
1283
1284 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1285 {
1286         switch (erp_action->action) {
1287         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1288                 return zfcp_erp_adapter_strategy(erp_action);
1289         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1290                 return zfcp_erp_port_forced_strategy(erp_action);
1291         case ZFCP_ERP_ACTION_REOPEN_PORT:
1292                 return zfcp_erp_port_strategy(erp_action);
1293         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1294                 return zfcp_erp_unit_strategy(erp_action);
1295         }
1296         return ZFCP_ERP_FAILED;
1297 }
1298
1299 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1300 {
1301         int retval;
1302         struct zfcp_adapter *adapter = erp_action->adapter;
1303         unsigned long flags;
1304
1305         read_lock_irqsave(&zfcp_data.config_lock, flags);
1306         write_lock(&adapter->erp_lock);
1307
1308         zfcp_erp_strategy_check_fsfreq(erp_action);
1309
1310         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1311                 zfcp_erp_action_dequeue(erp_action);
1312                 retval = ZFCP_ERP_DISMISSED;
1313                 goto unlock;
1314         }
1315
1316         zfcp_erp_action_to_running(erp_action);
1317
1318         /* no lock to allow for blocking operations */
1319         write_unlock(&adapter->erp_lock);
1320         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1321         retval = zfcp_erp_strategy_do_action(erp_action);
1322         read_lock_irqsave(&zfcp_data.config_lock, flags);
1323         write_lock(&adapter->erp_lock);
1324
1325         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1326                 retval = ZFCP_ERP_CONTINUES;
1327
1328         switch (retval) {
1329         case ZFCP_ERP_NOMEM:
1330                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1331                         ++adapter->erp_low_mem_count;
1332                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1333                 }
1334                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1335                         _zfcp_erp_adapter_reopen(adapter, 0, 66, NULL);
1336                 else {
1337                         zfcp_erp_strategy_memwait(erp_action);
1338                         retval = ZFCP_ERP_CONTINUES;
1339                 }
1340                 goto unlock;
1341
1342         case ZFCP_ERP_CONTINUES:
1343                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1344                         --adapter->erp_low_mem_count;
1345                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1346                 }
1347                 goto unlock;
1348         }
1349
1350         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1351         zfcp_erp_action_dequeue(erp_action);
1352         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1353         if (retval == ZFCP_ERP_EXIT)
1354                 goto unlock;
1355         zfcp_erp_strategy_followup_actions(erp_action);
1356
1357  unlock:
1358         write_unlock(&adapter->erp_lock);
1359         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1360
1361         if (retval != ZFCP_ERP_CONTINUES)
1362                 zfcp_erp_action_cleanup(erp_action, retval);
1363
1364         return retval;
1365 }
1366
1367 static int zfcp_erp_thread(void *data)
1368 {
1369         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1370         struct list_head *next;
1371         struct zfcp_erp_action *act;
1372         unsigned long flags;
1373         int ignore;
1374
1375         daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1376         /* Block all signals */
1377         siginitsetinv(&current->blocked, 0);
1378         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1379         wake_up(&adapter->erp_thread_wqh);
1380
1381         while (!(atomic_read(&adapter->status) &
1382                  ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1383                 write_lock_irqsave(&adapter->erp_lock, flags);
1384                 next = adapter->erp_ready_head.next;
1385                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1386
1387                 if (next != &adapter->erp_ready_head) {
1388                         act = list_entry(next, struct zfcp_erp_action, list);
1389
1390                         /* there is more to come after dismission, no notify */
1391                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1392                                 zfcp_erp_wakeup(adapter);
1393                 }
1394
1395                 zfcp_rec_dbf_event_thread_lock(4, adapter);
1396                 ignore = down_interruptible(&adapter->erp_ready_sem);
1397                 zfcp_rec_dbf_event_thread_lock(5, adapter);
1398         }
1399
1400         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1401         wake_up(&adapter->erp_thread_wqh);
1402
1403         return 0;
1404 }
1405
1406 /**
1407  * zfcp_erp_thread_setup - Start ERP thread for adapter
1408  * @adapter: Adapter to start the ERP thread for
1409  *
1410  * Returns 0 on success or error code from kernel_thread()
1411  */
1412 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1413 {
1414         int retval;
1415
1416         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1417         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1418         if (retval < 0) {
1419                 dev_err(&adapter->ccw_device->dev,
1420                         "Creating an ERP thread for the FCP device failed.\n");
1421                 return retval;
1422         }
1423         wait_event(adapter->erp_thread_wqh,
1424                    atomic_read(&adapter->status) &
1425                         ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1426         return 0;
1427 }
1428
1429 /**
1430  * zfcp_erp_thread_kill - Stop ERP thread.
1431  * @adapter: Adapter where the ERP thread should be stopped.
1432  *
1433  * The caller of this routine ensures that the specified adapter has
1434  * been shut down and that this operation has been completed. Thus,
1435  * there are no pending erp_actions which would need to be handled
1436  * here.
1437  */
1438 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1439 {
1440         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1441         up(&adapter->erp_ready_sem);
1442         zfcp_rec_dbf_event_thread_lock(3, adapter);
1443
1444         wait_event(adapter->erp_thread_wqh,
1445                    !(atomic_read(&adapter->status) &
1446                                 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1447
1448         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1449                           &adapter->status);
1450 }
1451
1452 /**
1453  * zfcp_erp_adapter_failed - Set adapter status to failed.
1454  * @adapter: Failed adapter.
1455  * @id: Event id for debug trace.
1456  * @ref: Reference for debug trace.
1457  */
1458 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, u8 id, void *ref)
1459 {
1460         zfcp_erp_modify_adapter_status(adapter, id, ref,
1461                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1462 }
1463
1464 /**
1465  * zfcp_erp_port_failed - Set port status to failed.
1466  * @port: Failed port.
1467  * @id: Event id for debug trace.
1468  * @ref: Reference for debug trace.
1469  */
1470 void zfcp_erp_port_failed(struct zfcp_port *port, u8 id, void *ref)
1471 {
1472         zfcp_erp_modify_port_status(port, id, ref,
1473                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1474 }
1475
1476 /**
1477  * zfcp_erp_unit_failed - Set unit status to failed.
1478  * @unit: Failed unit.
1479  * @id: Event id for debug trace.
1480  * @ref: Reference for debug trace.
1481  */
1482 void zfcp_erp_unit_failed(struct zfcp_unit *unit, u8 id, void *ref)
1483 {
1484         zfcp_erp_modify_unit_status(unit, id, ref,
1485                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1486 }
1487
1488 /**
1489  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1490  * @adapter: adapter for which to wait for completion of its error recovery
1491  */
1492 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1493 {
1494         wait_event(adapter->erp_done_wqh,
1495                    !(atomic_read(&adapter->status) &
1496                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1497 }
1498
1499 /**
1500  * zfcp_erp_modify_adapter_status - change adapter status bits
1501  * @adapter: adapter to change the status
1502  * @id: id for the debug trace
1503  * @ref: reference for the debug trace
1504  * @mask: status bits to change
1505  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1506  *
1507  * Changes in common status bits are propagated to attached ports and units.
1508  */
1509 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, u8 id,
1510                                     void *ref, u32 mask, int set_or_clear)
1511 {
1512         struct zfcp_port *port;
1513         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1514
1515         if (set_or_clear == ZFCP_SET) {
1516                 if (status_change_set(mask, &adapter->status))
1517                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1518                 atomic_set_mask(mask, &adapter->status);
1519         } else {
1520                 if (status_change_clear(mask, &adapter->status))
1521                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1522                 atomic_clear_mask(mask, &adapter->status);
1523                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1524                         atomic_set(&adapter->erp_counter, 0);
1525         }
1526
1527         if (common_mask)
1528                 list_for_each_entry(port, &adapter->port_list_head, list)
1529                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1530                                                     set_or_clear);
1531 }
1532
1533 /**
1534  * zfcp_erp_modify_port_status - change port status bits
1535  * @port: port to change the status bits
1536  * @id: id for the debug trace
1537  * @ref: reference for the debug trace
1538  * @mask: status bits to change
1539  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1540  *
1541  * Changes in common status bits are propagated to attached units.
1542  */
1543 void zfcp_erp_modify_port_status(struct zfcp_port *port, u8 id, void *ref,
1544                                  u32 mask, int set_or_clear)
1545 {
1546         struct zfcp_unit *unit;
1547         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1548
1549         if (set_or_clear == ZFCP_SET) {
1550                 if (status_change_set(mask, &port->status))
1551                         zfcp_rec_dbf_event_port(id, ref, port);
1552                 atomic_set_mask(mask, &port->status);
1553         } else {
1554                 if (status_change_clear(mask, &port->status))
1555                         zfcp_rec_dbf_event_port(id, ref, port);
1556                 atomic_clear_mask(mask, &port->status);
1557                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1558                         atomic_set(&port->erp_counter, 0);
1559         }
1560
1561         if (common_mask)
1562                 list_for_each_entry(unit, &port->unit_list_head, list)
1563                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1564                                                     set_or_clear);
1565 }
1566
1567 /**
1568  * zfcp_erp_modify_unit_status - change unit status bits
1569  * @unit: unit to change the status bits
1570  * @id: id for the debug trace
1571  * @ref: reference for the debug trace
1572  * @mask: status bits to change
1573  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1574  */
1575 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, u8 id, void *ref,
1576                                  u32 mask, int set_or_clear)
1577 {
1578         if (set_or_clear == ZFCP_SET) {
1579                 if (status_change_set(mask, &unit->status))
1580                         zfcp_rec_dbf_event_unit(id, ref, unit);
1581                 atomic_set_mask(mask, &unit->status);
1582         } else {
1583                 if (status_change_clear(mask, &unit->status))
1584                         zfcp_rec_dbf_event_unit(id, ref, unit);
1585                 atomic_clear_mask(mask, &unit->status);
1586                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1587                         atomic_set(&unit->erp_counter, 0);
1588                 }
1589         }
1590 }
1591
1592 /**
1593  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1594  * @port: The "boxed" port.
1595  * @id: The debug trace id.
1596  * @id: Reference for the debug trace.
1597  */
1598 void zfcp_erp_port_boxed(struct zfcp_port *port, u8 id, void *ref)
1599 {
1600         unsigned long flags;
1601
1602         read_lock_irqsave(&zfcp_data.config_lock, flags);
1603         zfcp_erp_modify_port_status(port, id, ref,
1604                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1605         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1606         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1607 }
1608
1609 /**
1610  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1611  * @port: The "boxed" unit.
1612  * @id: The debug trace id.
1613  * @id: Reference for the debug trace.
1614  */
1615 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, u8 id, void *ref)
1616 {
1617         zfcp_erp_modify_unit_status(unit, id, ref,
1618                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1619         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1620 }
1621
1622 /**
1623  * zfcp_erp_port_access_denied - Adapter denied access to port.
1624  * @port: port where access has been denied
1625  * @id: id for debug trace
1626  * @ref: reference for debug trace
1627  *
1628  * Since the adapter has denied access, stop using the port and the
1629  * attached units.
1630  */
1631 void zfcp_erp_port_access_denied(struct zfcp_port *port, u8 id, void *ref)
1632 {
1633         unsigned long flags;
1634
1635         read_lock_irqsave(&zfcp_data.config_lock, flags);
1636         zfcp_erp_modify_port_status(port, id, ref,
1637                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1638                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1639         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1640 }
1641
1642 /**
1643  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1644  * @unit: unit where access has been denied
1645  * @id: id for debug trace
1646  * @ref: reference for debug trace
1647  *
1648  * Since the adapter has denied access, stop using the unit.
1649  */
1650 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, u8 id, void *ref)
1651 {
1652         zfcp_erp_modify_unit_status(unit, id, ref,
1653                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1654                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1655 }
1656
1657 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, u8 id,
1658                                          void *ref)
1659 {
1660         int status = atomic_read(&unit->status);
1661         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1662                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1663                 return;
1664
1665         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1666 }
1667
1668 static void zfcp_erp_port_access_changed(struct zfcp_port *port, u8 id,
1669                                          void *ref)
1670 {
1671         struct zfcp_unit *unit;
1672         int status = atomic_read(&port->status);
1673
1674         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1675                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1676                 list_for_each_entry(unit, &port->unit_list_head, list)
1677                                     zfcp_erp_unit_access_changed(unit, id, ref);
1678                 return;
1679         }
1680
1681         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1682 }
1683
1684 /**
1685  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1686  * @adapter: Adapter where the Access Control Table (ACT) changed
1687  * @id: Id for debug trace
1688  * @ref: Reference for debug trace
1689  */
1690 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, u8 id,
1691                                      void *ref)
1692 {
1693         struct zfcp_port *port;
1694         unsigned long flags;
1695
1696         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1697                 return;
1698
1699         read_lock_irqsave(&zfcp_data.config_lock, flags);
1700         list_for_each_entry(port, &adapter->port_list_head, list)
1701                 zfcp_erp_port_access_changed(port, id, ref);
1702         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1703 }