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

   1 /*
   2  * zfcp device driver
   3  *
   4  * Error Recovery Procedures (ERP).
   5  *
   6  * Copyright IBM Corporation 2002, 2008
   7  */
   8
   9 #include "zfcp_ext.h"
  10
  11 #define ZFCP_MAX_ERPS                   3
  12
  13 enum zfcp_erp_act_flags {
  14         ZFCP_STATUS_ERP_TIMEDOUT        = 0x10000000,
  15         ZFCP_STATUS_ERP_CLOSE_ONLY      = 0x01000000,
  16         ZFCP_STATUS_ERP_DISMISSING      = 0x00100000,
  17         ZFCP_STATUS_ERP_DISMISSED       = 0x00200000,
  18         ZFCP_STATUS_ERP_LOWMEM          = 0x00400000,
  19 };
  20
  21 enum zfcp_erp_steps {
  22         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
  23         ZFCP_ERP_STEP_FSF_XCONFIG       = 0x0001,
  24         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
  25         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
  26         ZFCP_ERP_STEP_NAMESERVER_LOOKUP = 0x0400,
  27         ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
  28         ZFCP_ERP_STEP_UNIT_CLOSING      = 0x1000,
  29         ZFCP_ERP_STEP_UNIT_OPENING      = 0x2000,
  30 };
  31
  32 enum zfcp_erp_act_type {
  33         ZFCP_ERP_ACTION_REOPEN_UNIT        = 1,
  34         ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
  35         ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
  36         ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
  37 };
  38
  39 enum zfcp_erp_act_state {
  40         ZFCP_ERP_ACTION_RUNNING = 1,
  41         ZFCP_ERP_ACTION_READY   = 2,
  42 };
  43
  44 enum zfcp_erp_act_result {
  45         ZFCP_ERP_SUCCEEDED = 0,
  46         ZFCP_ERP_FAILED    = 1,
  47         ZFCP_ERP_CONTINUES = 2,
  48         ZFCP_ERP_EXIT      = 3,
  49         ZFCP_ERP_DISMISSED = 4,
  50         ZFCP_ERP_NOMEM     = 5,
  51 };
  52
  53 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
  54 {
  55         zfcp_erp_modify_adapter_status(adapter, 15, NULL,
  56                                        ZFCP_STATUS_COMMON_UNBLOCKED | mask,
  57                                        ZFCP_CLEAR);
  58 }
  59
  60 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
  61 {
  62         struct zfcp_erp_action *curr_act;
  63
  64         list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
  65                 if (act == curr_act)
  66                         return ZFCP_ERP_ACTION_RUNNING;
  67         return 0;
  68 }
  69
  70 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
  71 {
  72         struct zfcp_adapter *adapter = act->adapter;
  73
  74         list_move(&act->list, &act->adapter->erp_ready_head);
  75         zfcp_rec_dbf_event_action(146, act);
  76         up(&adapter->erp_ready_sem);
  77         zfcp_rec_dbf_event_thread(2, adapter);
  78 }
  79
  80 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
  81 {
  82         act->status |= ZFCP_STATUS_ERP_DISMISSED;
  83         if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
  84                 zfcp_erp_action_ready(act);
  85 }
  86
  87 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
  88 {
  89         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
  90                 zfcp_erp_action_dismiss(&unit->erp_action);
  91 }
  92
  93 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
  94 {
  95         struct zfcp_unit *unit;
  96
  97         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
  98                 zfcp_erp_action_dismiss(&port->erp_action);
  99         else
 100                 list_for_each_entry(unit, &port->unit_list_head, list)
 101                     zfcp_erp_action_dismiss_unit(unit);
 102 }
 103
 104 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 105 {
 106         struct zfcp_port *port;
 107
 108         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 109                 zfcp_erp_action_dismiss(&adapter->erp_action);
 110         else
 111                 list_for_each_entry(port, &adapter->port_list_head, list)
 112                     zfcp_erp_action_dismiss_port(port);
 113 }
 114
 115 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 116                                  struct zfcp_port *port,
 117                                  struct zfcp_unit *unit)
 118 {
 119         int need = want;
 120         int u_status, p_status, a_status;
 121
 122         switch (want) {
 123         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 124                 u_status = atomic_read(&unit->status);
 125                 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 126                         return 0;
 127                 p_status = atomic_read(&port->status);
 128                 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
 129                       p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 130                         return 0;
 131                 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 132                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 133                 /* fall through */
 134         case ZFCP_ERP_ACTION_REOPEN_PORT:
 135         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 136                 p_status = atomic_read(&port->status);
 137                 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 138                         return 0;
 139                 a_status = atomic_read(&adapter->status);
 140                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
 141                       a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 142                         return 0;
 143                 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 144                         need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
 145                 /* fall through */
 146         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 147                 a_status = atomic_read(&adapter->status);
 148                 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 149                         return 0;
 150         }
 151
 152         return need;
 153 }
 154
 155 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
 156                                                   struct zfcp_adapter *adapter,
 157                                                   struct zfcp_port *port,
 158                                                   struct zfcp_unit *unit)
 159 {
 160         struct zfcp_erp_action *erp_action;
 161         u32 status = 0;
 162
 163         switch (need) {
 164         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 165                 zfcp_unit_get(unit);
 166                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
 167                 erp_action = &unit->erp_action;
 168                 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
 169                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 170                 break;
 171
 172         case ZFCP_ERP_ACTION_REOPEN_PORT:
 173         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 174                 zfcp_port_get(port);
 175                 zfcp_erp_action_dismiss_port(port);
 176                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
 177                 erp_action = &port->erp_action;
 178                 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
 179                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 180                 break;
 181
 182         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 183                 zfcp_adapter_get(adapter);
 184                 zfcp_erp_action_dismiss_adapter(adapter);
 185                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
 186                 erp_action = &adapter->erp_action;
 187                 if (!(atomic_read(&adapter->status) &
 188                       ZFCP_STATUS_COMMON_RUNNING))
 189                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 190                 break;
 191
 192         default:
 193                 return NULL;
 194         }
 195
 196         memset(erp_action, 0, sizeof(struct zfcp_erp_action));
 197         erp_action->adapter = adapter;
 198         erp_action->port = port;
 199         erp_action->unit = unit;
 200         erp_action->action = need;
 201         erp_action->status = status;
 202
 203         return erp_action;
 204 }
 205
 206 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 207                                    struct zfcp_port *port,
 208                                    struct zfcp_unit *unit, u8 id, void *ref)
 209 {
 210         int retval = 1, need;
 211         struct zfcp_erp_action *act = NULL;
 212
 213         if (!(atomic_read(&adapter->status) &
 214               ZFCP_STATUS_ADAPTER_ERP_THREAD_UP))
 215                 return -EIO;
 216
 217         need = zfcp_erp_required_act(want, adapter, port, unit);
 218         if (!need)
 219                 goto out;
 220
 221         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 222         act = zfcp_erp_setup_act(need, adapter, port, unit);
 223         if (!act)
 224                 goto out;
 225         ++adapter->erp_total_count;
 226         list_add_tail(&act->list, &adapter->erp_ready_head);
 227         up(&adapter->erp_ready_sem);
 228         zfcp_rec_dbf_event_thread(1, adapter);
 229         retval = 0;
 230  out:
 231         zfcp_rec_dbf_event_trigger(id, ref, want, need, act,
 232                                    adapter, port, unit);
 233         return retval;
 234 }
 235
 236 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 237                                     int clear_mask, u8 id, void *ref)
 238 {
 239         zfcp_erp_adapter_block(adapter, clear_mask);
 240
 241         /* ensure propagation of failed status to new devices */
 242         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 243                 zfcp_erp_adapter_failed(adapter, 13, NULL);
 244                 return -EIO;
 245         }
 246         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 247                                        adapter, NULL, NULL, id, ref);
 248 }
 249
 250 /**
 251  * zfcp_erp_adapter_reopen - Reopen adapter.
 252  * @adapter: Adapter to reopen.
 253  * @clear: Status flags to clear.
 254  * @id: Id for debug trace event.
 255  * @ref: Reference for debug trace event.
 256  */
 257 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
 258                              u8 id, void *ref)
 259 {
 260         unsigned long flags;
 261
 262         read_lock_irqsave(&zfcp_data.config_lock, flags);
 263         write_lock(&adapter->erp_lock);
 264         _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
 265         write_unlock(&adapter->erp_lock);
 266         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 267 }
 268
 269 /**
 270  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 271  * @adapter: Adapter to shut down.
 272  * @clear: Status flags to clear.
 273  * @id: Id for debug trace event.
 274  * @ref: Reference for debug trace event.
 275  */
 276 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 277                                u8 id, void *ref)
 278 {
 279         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 280         zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
 281 }
 282
 283 /**
 284  * zfcp_erp_port_shutdown - Shutdown port
 285  * @port: Port to shut down.
 286  * @clear: Status flags to clear.
 287  * @id: Id for debug trace event.
 288  * @ref: Reference for debug trace event.
 289  */
 290 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, u8 id, void *ref)
 291 {
 292         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 293         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 294 }
 295
 296 /**
 297  * zfcp_erp_unit_shutdown - Shutdown unit
 298  * @unit: Unit to shut down.
 299  * @clear: Status flags to clear.
 300  * @id: Id for debug trace event.
 301  * @ref: Reference for debug trace event.
 302  */
 303 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, u8 id, void *ref)
 304 {
 305         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 306         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 307 }
 308
 309 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 310 {
 311         zfcp_erp_modify_port_status(port, 17, NULL,
 312                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 313                                     ZFCP_CLEAR);
 314 }
 315
 316 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 317                                          int clear, u8 id, void *ref)
 318 {
 319         zfcp_erp_port_block(port, clear);
 320
 321         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 322                 return;
 323
 324         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 325                                 port->adapter, port, NULL, id, ref);
 326 }
 327
 328 /**
 329  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 330  * @port: Port to force close and to reopen.
 331  * @id: Id for debug trace event.
 332  * @ref: Reference for debug trace event.
 333  */
 334 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, u8 id,
 335                                  void *ref)
 336 {
 337         unsigned long flags;
 338         struct zfcp_adapter *adapter = port->adapter;
 339
 340         read_lock_irqsave(&zfcp_data.config_lock, flags);
 341         write_lock(&adapter->erp_lock);
 342         _zfcp_erp_port_forced_reopen(port, clear, id, ref);
 343         write_unlock(&adapter->erp_lock);
 344         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 345 }
 346
 347 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, u8 id,
 348                                  void *ref)
 349 {
 350         zfcp_erp_port_block(port, clear);
 351
 352         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 353                 /* ensure propagation of failed status to new devices */
 354                 zfcp_erp_port_failed(port, 14, NULL);
 355                 return -EIO;
 356         }
 357
 358         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 359                                        port->adapter, port, NULL, id, ref);
 360 }
 361
 362 /**
 363  * zfcp_erp_port_reopen - trigger remote port recovery
 364  * @port: port to recover
 365  * @clear_mask: flags in port status to be cleared
 366  *
 367  * Returns 0 if recovery has been triggered, < 0 if not.
 368  */
 369 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, u8 id, void *ref)
 370 {
 371         unsigned long flags;
 372         int retval;
 373         struct zfcp_adapter *adapter = port->adapter;
 374
 375         read_lock_irqsave(&zfcp_data.config_lock, flags);
 376         write_lock(&adapter->erp_lock);
 377         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 378         write_unlock(&adapter->erp_lock);
 379         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 380
 381         return retval;
 382 }
 383
 384 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 385 {
 386         zfcp_erp_modify_unit_status(unit, 19, NULL,
 387                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 388                                     ZFCP_CLEAR);
 389 }
 390
 391 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, u8 id,
 392                                   void *ref)
 393 {
 394         struct zfcp_adapter *adapter = unit->port->adapter;
 395
 396         zfcp_erp_unit_block(unit, clear);
 397
 398         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 399                 return;
 400
 401         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 402                                 adapter, unit->port, unit, id, ref);
 403 }
 404
 405 /**
 406  * zfcp_erp_unit_reopen - initiate reopen of a unit
 407  * @unit: unit to be reopened
 408  * @clear_mask: specifies flags in unit status to be cleared
 409  * Return: 0 on success, < 0 on error
 410  */
 411 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, u8 id, void *ref)
 412 {
 413         unsigned long flags;
 414         struct zfcp_port *port = unit->port;
 415         struct zfcp_adapter *adapter = port->adapter;
 416
 417         read_lock_irqsave(&zfcp_data.config_lock, flags);
 418         write_lock(&adapter->erp_lock);
 419         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 420         write_unlock(&adapter->erp_lock);
 421         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 422 }
 423
 424 static int status_change_set(unsigned long mask, atomic_t *status)
 425 {
 426         return (atomic_read(status) ^ mask) & mask;
 427 }
 428
 429 static int status_change_clear(unsigned long mask, atomic_t *status)
 430 {
 431         return atomic_read(status) & mask;
 432 }
 433
 434 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 435 {
 436         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 437                 zfcp_rec_dbf_event_adapter(16, NULL, adapter);
 438         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 439 }
 440
 441 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 442 {
 443         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 444                 zfcp_rec_dbf_event_port(18, NULL, port);
 445         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 446 }
 447
 448 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 449 {
 450         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 451                 zfcp_rec_dbf_event_unit(20, NULL, unit);
 452         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 453 }
 454
 455 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 456 {
 457         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 458         zfcp_rec_dbf_event_action(145, erp_action);
 459 }
 460
 461 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 462 {
 463         struct zfcp_adapter *adapter = act->adapter;
 464
 465         if (!act->fsf_req)
 466                 return;
 467
 468         spin_lock(&adapter->req_list_lock);
 469         if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
 470             act->fsf_req->erp_action == act) {
 471                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 472                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 473                         act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 474                         zfcp_rec_dbf_event_action(142, act);
 475                         act->fsf_req->erp_action = NULL;
 476                 }
 477                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 478                         zfcp_rec_dbf_event_action(143, act);
 479                 if (act->fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
 480                                             ZFCP_STATUS_FSFREQ_DISMISSED))
 481                         act->fsf_req = NULL;
 482         } else
 483                 act->fsf_req = NULL;
 484         spin_unlock(&adapter->req_list_lock);
 485 }
 486
 487 /**
 488  * zfcp_erp_notify - Trigger ERP action.
 489  * @erp_action: ERP action to continue.
 490  * @set_mask: ERP action status flags to set.
 491  */
 492 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 493 {
 494         struct zfcp_adapter *adapter = erp_action->adapter;
 495         unsigned long flags;
 496
 497         write_lock_irqsave(&adapter->erp_lock, flags);
 498         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 499                 erp_action->status |= set_mask;
 500                 zfcp_erp_action_ready(erp_action);
 501         }
 502         write_unlock_irqrestore(&adapter->erp_lock, flags);
 503 }
 504
 505 /**
 506  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 507  * @data: ERP action (from timer data)
 508  */
 509 void zfcp_erp_timeout_handler(unsigned long data)
 510 {
 511         struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
 512         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 513 }
 514
 515 static void zfcp_erp_memwait_handler(unsigned long data)
 516 {
 517         zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
 518 }
 519
 520 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 521 {
 522         init_timer(&erp_action->timer);
 523         erp_action->timer.function = zfcp_erp_memwait_handler;
 524         erp_action->timer.data = (unsigned long) erp_action;
 525         erp_action->timer.expires = jiffies + HZ;
 526         add_timer(&erp_action->timer);
 527 }
 528
 529 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 530                                       int clear, u8 id, void *ref)
 531 {
 532         struct zfcp_port *port;
 533
 534         list_for_each_entry(port, &adapter->port_list_head, list)
 535                 _zfcp_erp_port_reopen(port, clear, id, ref);
 536 }
 537
 538 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear, u8 id,
 539                                       void *ref)
 540 {
 541         struct zfcp_unit *unit;
 542
 543         list_for_each_entry(unit, &port->unit_list_head, list)
 544                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 545 }
 546
 547 static void zfcp_erp_strategy_followup_actions(struct zfcp_erp_action *act)
 548 {
 549         struct zfcp_adapter *adapter = act->adapter;
 550         struct zfcp_port *port = act->port;
 551         struct zfcp_unit *unit = act->unit;
 552         u32 status = act->status;
 553
 554         /* initiate follow-up actions depending on success of finished action */
 555         switch (act->action) {
 556
 557         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 558                 if (status == ZFCP_ERP_SUCCEEDED)
 559                         _zfcp_erp_port_reopen_all(adapter, 0, 70, NULL);
 560                 else
 561                         _zfcp_erp_adapter_reopen(adapter, 0, 71, NULL);
 562                 break;
 563
 564         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 565                 if (status == ZFCP_ERP_SUCCEEDED)
 566                         _zfcp_erp_port_reopen(port, 0, 72, NULL);
 567                 else
 568                         _zfcp_erp_adapter_reopen(adapter, 0, 73, NULL);
 569                 break;
 570
 571         case ZFCP_ERP_ACTION_REOPEN_PORT:
 572                 if (status == ZFCP_ERP_SUCCEEDED)
 573                         _zfcp_erp_unit_reopen_all(port, 0, 74, NULL);
 574                 else
 575                         _zfcp_erp_port_forced_reopen(port, 0, 75, NULL);
 576                 break;
 577
 578         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 579                 if (status != ZFCP_ERP_SUCCEEDED)
 580                         _zfcp_erp_port_reopen(unit->port, 0, 76, NULL);
 581                 break;
 582         }
 583 }
 584
 585 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 586 {
 587         unsigned long flags;
 588
 589         read_lock_irqsave(&zfcp_data.config_lock, flags);
 590         read_lock(&adapter->erp_lock);
 591         if (list_empty(&adapter->erp_ready_head) &&
 592             list_empty(&adapter->erp_running_head)) {
 593                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 594                                           &adapter->status);
 595                         wake_up(&adapter->erp_done_wqh);
 596         }
 597         read_unlock(&adapter->erp_lock);
 598         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 599 }
 600
 601 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 602 {
 603         if (zfcp_qdio_open(act->adapter))
 604                 return ZFCP_ERP_FAILED;
 605         init_waitqueue_head(&act->adapter->request_wq);
 606         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 607         return ZFCP_ERP_SUCCEEDED;
 608 }
 609
 610 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 611 {
 612         struct zfcp_port *port;
 613         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 614                                  adapter->peer_d_id);
 615         if (IS_ERR(port)) /* error or port already attached */
 616                 return;
 617         _zfcp_erp_port_reopen(port, 0, 150, NULL);
 618 }
 619
 620 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 621 {
 622         int retries;
 623         int sleep = 1;
 624         struct zfcp_adapter *adapter = erp_action->adapter;
 625
 626         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 627
 628         for (retries = 7; retries; retries--) {
 629                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 630                                   &adapter->status);
 631                 write_lock_irq(&adapter->erp_lock);
 632                 zfcp_erp_action_to_running(erp_action);
 633                 write_unlock_irq(&adapter->erp_lock);
 634                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 635                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 636                                           &adapter->status);
 637                         return ZFCP_ERP_FAILED;
 638                 }
 639
 640                 zfcp_rec_dbf_event_thread_lock(6, adapter);
 641                 down(&adapter->erp_ready_sem);
 642                 zfcp_rec_dbf_event_thread_lock(7, adapter);
 643                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 644                         break;
 645
 646                 if (!(atomic_read(&adapter->status) &
 647                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 648                         break;
 649
 650                 ssleep(sleep);
 651                 sleep *= 2;
 652         }
 653
 654         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 655                           &adapter->status);
 656
 657         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 658                 return ZFCP_ERP_FAILED;
 659
 660         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 661                 zfcp_erp_enqueue_ptp_port(adapter);
 662
 663         return ZFCP_ERP_SUCCEEDED;
 664 }
 665
 666 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 667 {
 668         int ret;
 669         struct zfcp_adapter *adapter = act->adapter;
 670
 671         write_lock_irq(&adapter->erp_lock);
 672         zfcp_erp_action_to_running(act);
 673         write_unlock_irq(&adapter->erp_lock);
 674
 675         ret = zfcp_fsf_exchange_port_data(act);
 676         if (ret == -EOPNOTSUPP)
 677                 return ZFCP_ERP_SUCCEEDED;
 678         if (ret)
 679                 return ZFCP_ERP_FAILED;
 680
 681         zfcp_rec_dbf_event_thread_lock(8, adapter);
 682         down(&adapter->erp_ready_sem);
 683         zfcp_rec_dbf_event_thread_lock(9, adapter);
 684         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 685                 return ZFCP_ERP_FAILED;
 686
 687         return ZFCP_ERP_SUCCEEDED;
 688 }
 689
 690 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 691 {
 692         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 693                 return ZFCP_ERP_FAILED;
 694
 695         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 696                 return ZFCP_ERP_FAILED;
 697
 698         atomic_set(&act->adapter->stat_miss, 16);
 699         if (zfcp_status_read_refill(act->adapter))
 700                 return ZFCP_ERP_FAILED;
 701
 702         return ZFCP_ERP_SUCCEEDED;
 703 }
 704
 705 static int zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *act,
 706                                              int close)
 707 {
 708         int retval = ZFCP_ERP_SUCCEEDED;
 709         struct zfcp_adapter *adapter = act->adapter;
 710
 711         if (close)
 712                 goto close_only;
 713
 714         retval = zfcp_erp_adapter_strategy_open_qdio(act);
 715         if (retval != ZFCP_ERP_SUCCEEDED)
 716                 goto failed_qdio;
 717
 718         retval = zfcp_erp_adapter_strategy_open_fsf(act);
 719         if (retval != ZFCP_ERP_SUCCEEDED)
 720                 goto failed_openfcp;
 721
 722         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &act->adapter->status);
 723
 724         return ZFCP_ERP_SUCCEEDED;
 725
 726  close_only:
 727         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
 728                           &act->adapter->status);
 729
 730  failed_openfcp:
 731         /* close queues to ensure that buffers are not accessed by adapter */
 732         zfcp_qdio_close(adapter);
 733         zfcp_fsf_req_dismiss_all(adapter);
 734         adapter->fsf_req_seq_no = 0;
 735         /* all ports and units are closed */
 736         zfcp_erp_modify_adapter_status(adapter, 24, NULL,
 737                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 738  failed_qdio:
 739         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 740                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 741                           &act->adapter->status);
 742         return retval;
 743 }
 744
 745 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 746 {
 747         int retval;
 748
 749         zfcp_erp_adapter_strategy_generic(act, 1); /* close */
 750         if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 751                 return ZFCP_ERP_EXIT;
 752
 753         retval = zfcp_erp_adapter_strategy_generic(act, 0); /* open */
 754
 755         if (retval == ZFCP_ERP_FAILED)
 756                 ssleep(8);
 757
 758         return retval;
 759 }
 760
 761 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 762 {
 763         int retval;
 764
 765         retval = zfcp_fsf_close_physical_port(act);
 766         if (retval == -ENOMEM)
 767                 return ZFCP_ERP_NOMEM;
 768         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 769         if (retval)
 770                 return ZFCP_ERP_FAILED;
 771
 772         return ZFCP_ERP_CONTINUES;
 773 }
 774
 775 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 776 {
 777         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 778                           ZFCP_STATUS_PORT_PHYS_CLOSING |
 779                           ZFCP_STATUS_PORT_INVALID_WWPN,
 780                           &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         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
 841         return zfcp_erp_port_strategy_open_port(act);
 842 }
 843
 844 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
 845 {
 846         int retval;
 847         struct zfcp_port *port = container_of(work, struct zfcp_port,
 848                                               gid_pn_work);
 849
 850         retval = zfcp_fc_ns_gid_pn(&port->erp_action);
 851         if (retval == -ENOMEM)
 852                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_NOMEM);
 853         port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
 854         if (retval)
 855                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_FAILED);
 856
 857 }
 858
 859 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 860 {
 861         struct zfcp_adapter *adapter = act->adapter;
 862         struct zfcp_port *port = act->port;
 863         int p_status = atomic_read(&port->status);
 864
 865         switch (act->step) {
 866         case ZFCP_ERP_STEP_UNINITIALIZED:
 867         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 868         case ZFCP_ERP_STEP_PORT_CLOSING:
 869                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 870                         return zfcp_erp_open_ptp_port(act);
 871                 if (!(p_status & ZFCP_STATUS_PORT_DID_DID)) {
 872                         queue_work(zfcp_data.work_queue, &port->gid_pn_work);
 873                         return ZFCP_ERP_CONTINUES;
 874                 }
 875         case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
 876                 if (!(p_status & ZFCP_STATUS_PORT_DID_DID)) {
 877                         if (p_status & (ZFCP_STATUS_PORT_INVALID_WWPN)) {
 878                                 zfcp_erp_port_failed(port, 26, NULL);
 879                                 return ZFCP_ERP_EXIT;
 880                         }
 881                         return ZFCP_ERP_FAILED;
 882                 }
 883                 return zfcp_erp_port_strategy_open_port(act);
 884
 885         case ZFCP_ERP_STEP_PORT_OPENING:
 886                 /* D_ID might have changed during open */
 887                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 888                         if (p_status & ZFCP_STATUS_PORT_DID_DID)
 889                                 return ZFCP_ERP_SUCCEEDED;
 890                         else {
 891                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 892                                 return ZFCP_ERP_CONTINUES;
 893                         }
 894                 /* fall through otherwise */
 895                 }
 896         }
 897         return ZFCP_ERP_FAILED;
 898 }
 899
 900 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 901 {
 902         struct zfcp_port *port = erp_action->port;
 903
 904         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 905                 goto close_init_done;
 906
 907         switch (erp_action->step) {
 908         case ZFCP_ERP_STEP_UNINITIALIZED:
 909                 zfcp_erp_port_strategy_clearstati(port);
 910                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 911                         return zfcp_erp_port_strategy_close(erp_action);
 912                 break;
 913
 914         case ZFCP_ERP_STEP_PORT_CLOSING:
 915                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 916                         return ZFCP_ERP_FAILED;
 917                 break;
 918         }
 919
 920 close_init_done:
 921         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 922                 return ZFCP_ERP_EXIT;
 923
 924         return zfcp_erp_port_strategy_open_common(erp_action);
 925 }
 926
 927 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 928 {
 929         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 930                           ZFCP_STATUS_UNIT_SHARED |
 931                           ZFCP_STATUS_UNIT_READONLY,
 932                           &unit->status);
 933 }
 934
 935 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 936 {
 937         int retval = zfcp_fsf_close_unit(erp_action);
 938         if (retval == -ENOMEM)
 939                 return ZFCP_ERP_NOMEM;
 940         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 941         if (retval)
 942                 return ZFCP_ERP_FAILED;
 943         return ZFCP_ERP_CONTINUES;
 944 }
 945
 946 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 947 {
 948         int retval = zfcp_fsf_open_unit(erp_action);
 949         if (retval == -ENOMEM)
 950                 return ZFCP_ERP_NOMEM;
 951         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 952         if (retval)
 953                 return  ZFCP_ERP_FAILED;
 954         return ZFCP_ERP_CONTINUES;
 955 }
 956
 957 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 958 {
 959         struct zfcp_unit *unit = erp_action->unit;
 960
 961         switch (erp_action->step) {
 962         case ZFCP_ERP_STEP_UNINITIALIZED:
 963                 zfcp_erp_unit_strategy_clearstati(unit);
 964                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 965                         return zfcp_erp_unit_strategy_close(erp_action);
 966                 /* already closed, fall through */
 967         case ZFCP_ERP_STEP_UNIT_CLOSING:
 968                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 969                         return ZFCP_ERP_FAILED;
 970                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 971                         return ZFCP_ERP_EXIT;
 972                 return zfcp_erp_unit_strategy_open(erp_action);
 973
 974         case ZFCP_ERP_STEP_UNIT_OPENING:
 975                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 976                         return ZFCP_ERP_SUCCEEDED;
 977         }
 978         return ZFCP_ERP_FAILED;
 979 }
 980
 981 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 982 {
 983         switch (result) {
 984         case ZFCP_ERP_SUCCEEDED :
 985                 atomic_set(&unit->erp_counter, 0);
 986                 zfcp_erp_unit_unblock(unit);
 987                 break;
 988         case ZFCP_ERP_FAILED :
 989                 atomic_inc(&unit->erp_counter);
 990                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
 991                         dev_err(&unit->port->adapter->ccw_device->dev,
 992                                 "ERP failed for unit 0x%016Lx on "
 993                                 "port 0x%016Lx\n",
 994                                 (unsigned long long)unit->fcp_lun,
 995                                 (unsigned long long)unit->port->wwpn);
 996                         zfcp_erp_unit_failed(unit, 21, NULL);
 997                 }
 998                 break;
 999         }
1000
1001         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1002                 zfcp_erp_unit_block(unit, 0);
1003                 result = ZFCP_ERP_EXIT;
1004         }
1005         return result;
1006 }
1007
1008 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1009 {
1010         switch (result) {
1011         case ZFCP_ERP_SUCCEEDED :
1012                 atomic_set(&port->erp_counter, 0);
1013                 zfcp_erp_port_unblock(port);
1014                 break;
1015
1016         case ZFCP_ERP_FAILED :
1017                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1018                         zfcp_erp_port_block(port, 0);
1019                         result = ZFCP_ERP_EXIT;
1020                 }
1021                 atomic_inc(&port->erp_counter);
1022                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1023                         dev_err(&port->adapter->ccw_device->dev,
1024                                 "ERP failed for remote port 0x%016Lx\n",
1025                                 (unsigned long long)port->wwpn);
1026                         zfcp_erp_port_failed(port, 22, NULL);
1027                 }
1028                 break;
1029         }
1030
1031         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1032                 zfcp_erp_port_block(port, 0);
1033                 result = ZFCP_ERP_EXIT;
1034         }
1035         return result;
1036 }
1037
1038 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1039                                            int result)
1040 {
1041         switch (result) {
1042         case ZFCP_ERP_SUCCEEDED :
1043                 atomic_set(&adapter->erp_counter, 0);
1044                 zfcp_erp_adapter_unblock(adapter);
1045                 break;
1046
1047         case ZFCP_ERP_FAILED :
1048                 atomic_inc(&adapter->erp_counter);
1049                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1050                         dev_err(&adapter->ccw_device->dev,
1051                                 "ERP cannot recover an error "
1052                                 "on the FCP device\n");
1053                         zfcp_erp_adapter_failed(adapter, 23, NULL);
1054                 }
1055                 break;
1056         }
1057
1058         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1059                 zfcp_erp_adapter_block(adapter, 0);
1060                 result = ZFCP_ERP_EXIT;
1061         }
1062         return result;
1063 }
1064
1065 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1066                                           int result)
1067 {
1068         struct zfcp_adapter *adapter = erp_action->adapter;
1069         struct zfcp_port *port = erp_action->port;
1070         struct zfcp_unit *unit = erp_action->unit;
1071
1072         switch (erp_action->action) {
1073
1074         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1075                 result = zfcp_erp_strategy_check_unit(unit, result);
1076                 break;
1077
1078         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1079         case ZFCP_ERP_ACTION_REOPEN_PORT:
1080                 result = zfcp_erp_strategy_check_port(port, result);
1081                 break;
1082
1083         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1084                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1085                 break;
1086         }
1087         return result;
1088 }
1089
1090 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1091 {
1092         int status = atomic_read(target_status);
1093
1094         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1095             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1096                 return 1; /* take it online */
1097
1098         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1099             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1100                 return 1; /* take it offline */
1101
1102         return 0;
1103 }
1104
1105 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1106 {
1107         int action = act->action;
1108         struct zfcp_adapter *adapter = act->adapter;
1109         struct zfcp_port *port = act->port;
1110         struct zfcp_unit *unit = act->unit;
1111         u32 erp_status = act->status;
1112
1113         switch (action) {
1114         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1115                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1116                         _zfcp_erp_adapter_reopen(adapter,
1117                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1118                                                  67, NULL);
1119                         return ZFCP_ERP_EXIT;
1120                 }
1121                 break;
1122
1123         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1124         case ZFCP_ERP_ACTION_REOPEN_PORT:
1125                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1126                         _zfcp_erp_port_reopen(port,
1127                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1128                                               68, NULL);
1129                         return ZFCP_ERP_EXIT;
1130                 }
1131                 break;
1132
1133         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1134                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1135                         _zfcp_erp_unit_reopen(unit,
1136                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1137                                               69, NULL);
1138                         return ZFCP_ERP_EXIT;
1139                 }
1140                 break;
1141         }
1142         return ret;
1143 }
1144
1145 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1146 {
1147         struct zfcp_adapter *adapter = erp_action->adapter;
1148
1149         adapter->erp_total_count--;
1150         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1151                 adapter->erp_low_mem_count--;
1152                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1153         }
1154
1155         list_del(&erp_action->list);
1156         zfcp_rec_dbf_event_action(144, erp_action);
1157
1158         switch (erp_action->action) {
1159         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1160                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1161                                   &erp_action->unit->status);
1162                 break;
1163
1164         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1165         case ZFCP_ERP_ACTION_REOPEN_PORT:
1166                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1167                                   &erp_action->port->status);
1168                 break;
1169
1170         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1171                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1172                                   &erp_action->adapter->status);
1173                 break;
1174         }
1175 }
1176
1177 struct zfcp_erp_add_work {
1178         struct zfcp_unit  *unit;
1179         struct work_struct work;
1180 };
1181
1182 static void zfcp_erp_scsi_scan(struct work_struct *work)
1183 {
1184         struct zfcp_erp_add_work *p =
1185                 container_of(work, struct zfcp_erp_add_work, work);
1186         struct zfcp_unit *unit = p->unit;
1187         struct fc_rport *rport = unit->port->rport;
1188
1189         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
1190                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
1191                          scsilun_to_int((struct scsi_lun *)&unit->fcp_lun), 0);
1192         atomic_clear_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1193         zfcp_unit_put(unit);
1194         wake_up(&unit->port->adapter->erp_done_wqh);
1195         kfree(p);
1196 }
1197
1198 static void zfcp_erp_schedule_work(struct zfcp_unit *unit)
1199 {
1200         struct zfcp_erp_add_work *p;
1201
1202         p = kzalloc(sizeof(*p), GFP_KERNEL);
1203         if (!p) {
1204                 dev_err(&unit->port->adapter->ccw_device->dev,
1205                         "Registering unit 0x%016Lx on port 0x%016Lx failed\n",
1206                         (unsigned long long)unit->fcp_lun,
1207                         (unsigned long long)unit->port->wwpn);
1208                 return;
1209         }
1210
1211         zfcp_unit_get(unit);
1212         atomic_set_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1213         INIT_WORK(&p->work, zfcp_erp_scsi_scan);
1214         p->unit = unit;
1215         queue_work(zfcp_data.work_queue, &p->work);
1216 }
1217
1218 static void zfcp_erp_rport_register(struct zfcp_port *port)
1219 {
1220         struct fc_rport_identifiers ids;
1221         ids.node_name = port->wwnn;
1222         ids.port_name = port->wwpn;
1223         ids.port_id = port->d_id;
1224         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
1225         port->rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
1226         if (!port->rport) {
1227                 dev_err(&port->adapter->ccw_device->dev,
1228                         "Registering port 0x%016Lx failed\n",
1229                         (unsigned long long)port->wwpn);
1230                 return;
1231         }
1232
1233         scsi_target_unblock(&port->rport->dev);
1234         port->rport->maxframe_size = port->maxframe_size;
1235         port->rport->supported_classes = port->supported_classes;
1236 }
1237
1238 static void zfcp_erp_rports_del(struct zfcp_adapter *adapter)
1239 {
1240         struct zfcp_port *port;
1241         list_for_each_entry(port, &adapter->port_list_head, list) {
1242                 if (!port->rport)
1243                         continue;
1244                 fc_remote_port_delete(port->rport);
1245                 port->rport = NULL;
1246         }
1247 }
1248
1249 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1250 {
1251         struct zfcp_adapter *adapter = act->adapter;
1252         struct zfcp_port *port = act->port;
1253         struct zfcp_unit *unit = act->unit;
1254
1255         switch (act->action) {
1256         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1257                 if ((result == ZFCP_ERP_SUCCEEDED) &&
1258                     !unit->device && port->rport) {
1259                         atomic_set_mask(ZFCP_STATUS_UNIT_REGISTERED,
1260                                         &unit->status);
1261                         if (!(atomic_read(&unit->status) &
1262                               ZFCP_STATUS_UNIT_SCSI_WORK_PENDING))
1263                                 zfcp_erp_schedule_work(unit);
1264                 }
1265                 zfcp_unit_put(unit);
1266                 break;
1267
1268         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1269         case ZFCP_ERP_ACTION_REOPEN_PORT:
1270                 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_NO_WWPN) {
1271                         zfcp_port_put(port);
1272                         return;
1273                 }
1274                 if ((result == ZFCP_ERP_SUCCEEDED) && !port->rport)
1275                         zfcp_erp_rport_register(port);
1276                 if ((result != ZFCP_ERP_SUCCEEDED) && port->rport) {
1277                         fc_remote_port_delete(port->rport);
1278                         port->rport = NULL;
1279                 }
1280                 zfcp_port_put(port);
1281                 break;
1282
1283         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1284                 if (result != ZFCP_ERP_SUCCEEDED)
1285                         zfcp_erp_rports_del(adapter);
1286                 else
1287                         schedule_work(&adapter->scan_work);
1288                 zfcp_adapter_put(adapter);
1289                 break;
1290         }
1291 }
1292
1293 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1294 {
1295         switch (erp_action->action) {
1296         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1297                 return zfcp_erp_adapter_strategy(erp_action);
1298         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1299                 return zfcp_erp_port_forced_strategy(erp_action);
1300         case ZFCP_ERP_ACTION_REOPEN_PORT:
1301                 return zfcp_erp_port_strategy(erp_action);
1302         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1303                 return zfcp_erp_unit_strategy(erp_action);
1304         }
1305         return ZFCP_ERP_FAILED;
1306 }
1307
1308 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1309 {
1310         int retval;
1311         struct zfcp_adapter *adapter = erp_action->adapter;
1312         unsigned long flags;
1313
1314         read_lock_irqsave(&zfcp_data.config_lock, flags);
1315         write_lock(&adapter->erp_lock);
1316
1317         zfcp_erp_strategy_check_fsfreq(erp_action);
1318
1319         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1320                 zfcp_erp_action_dequeue(erp_action);
1321                 retval = ZFCP_ERP_DISMISSED;
1322                 goto unlock;
1323         }
1324
1325         zfcp_erp_action_to_running(erp_action);
1326
1327         /* no lock to allow for blocking operations */
1328         write_unlock(&adapter->erp_lock);
1329         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1330         retval = zfcp_erp_strategy_do_action(erp_action);
1331         read_lock_irqsave(&zfcp_data.config_lock, flags);
1332         write_lock(&adapter->erp_lock);
1333
1334         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1335                 retval = ZFCP_ERP_CONTINUES;
1336
1337         switch (retval) {
1338         case ZFCP_ERP_NOMEM:
1339                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1340                         ++adapter->erp_low_mem_count;
1341                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1342                 }
1343                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1344                         _zfcp_erp_adapter_reopen(adapter, 0, 66, NULL);
1345                 else {
1346                         zfcp_erp_strategy_memwait(erp_action);
1347                         retval = ZFCP_ERP_CONTINUES;
1348                 }
1349                 goto unlock;
1350
1351         case ZFCP_ERP_CONTINUES:
1352                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1353                         --adapter->erp_low_mem_count;
1354                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1355                 }
1356                 goto unlock;
1357         }
1358
1359         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1360         zfcp_erp_action_dequeue(erp_action);
1361         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1362         if (retval == ZFCP_ERP_EXIT)
1363                 goto unlock;
1364         zfcp_erp_strategy_followup_actions(erp_action);
1365
1366  unlock:
1367         write_unlock(&adapter->erp_lock);
1368         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1369
1370         if (retval != ZFCP_ERP_CONTINUES)
1371                 zfcp_erp_action_cleanup(erp_action, retval);
1372
1373         return retval;
1374 }
1375
1376 static int zfcp_erp_thread(void *data)
1377 {
1378         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1379         struct list_head *next;
1380         struct zfcp_erp_action *act;
1381         unsigned long flags;
1382
1383         daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1384         /* Block all signals */
1385         siginitsetinv(&current->blocked, 0);
1386         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1387         wake_up(&adapter->erp_thread_wqh);
1388
1389         while (!(atomic_read(&adapter->status) &
1390                  ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1391                 write_lock_irqsave(&adapter->erp_lock, flags);
1392                 next = adapter->erp_ready_head.next;
1393                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1394
1395                 if (next != &adapter->erp_ready_head) {
1396                         act = list_entry(next, struct zfcp_erp_action, list);
1397
1398                         /* there is more to come after dismission, no notify */
1399                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1400                                 zfcp_erp_wakeup(adapter);
1401                 }
1402
1403                 zfcp_rec_dbf_event_thread_lock(4, adapter);
1404                 down_interruptible(&adapter->erp_ready_sem);
1405                 zfcp_rec_dbf_event_thread_lock(5, adapter);
1406         }
1407
1408         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1409         wake_up(&adapter->erp_thread_wqh);
1410
1411         return 0;
1412 }
1413
1414 /**
1415  * zfcp_erp_thread_setup - Start ERP thread for adapter
1416  * @adapter: Adapter to start the ERP thread for
1417  *
1418  * Returns 0 on success or error code from kernel_thread()
1419  */
1420 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1421 {
1422         int retval;
1423
1424         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1425         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1426         if (retval < 0) {
1427                 dev_err(&adapter->ccw_device->dev,
1428                         "Creating an ERP thread for the FCP device failed.\n");
1429                 return retval;
1430         }
1431         wait_event(adapter->erp_thread_wqh,
1432                    atomic_read(&adapter->status) &
1433                         ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1434         return 0;
1435 }
1436
1437 /**
1438  * zfcp_erp_thread_kill - Stop ERP thread.
1439  * @adapter: Adapter where the ERP thread should be stopped.
1440  *
1441  * The caller of this routine ensures that the specified adapter has
1442  * been shut down and that this operation has been completed. Thus,
1443  * there are no pending erp_actions which would need to be handled
1444  * here.
1445  */
1446 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1447 {
1448         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1449         up(&adapter->erp_ready_sem);
1450         zfcp_rec_dbf_event_thread_lock(3, adapter);
1451
1452         wait_event(adapter->erp_thread_wqh,
1453                    !(atomic_read(&adapter->status) &
1454                                 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1455
1456         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1457                           &adapter->status);
1458 }
1459
1460 /**
1461  * zfcp_erp_adapter_failed - Set adapter status to failed.
1462  * @adapter: Failed adapter.
1463  * @id: Event id for debug trace.
1464  * @ref: Reference for debug trace.
1465  */
1466 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, u8 id, void *ref)
1467 {
1468         zfcp_erp_modify_adapter_status(adapter, id, ref,
1469                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1470 }
1471
1472 /**
1473  * zfcp_erp_port_failed - Set port status to failed.
1474  * @port: Failed port.
1475  * @id: Event id for debug trace.
1476  * @ref: Reference for debug trace.
1477  */
1478 void zfcp_erp_port_failed(struct zfcp_port *port, u8 id, void *ref)
1479 {
1480         zfcp_erp_modify_port_status(port, id, ref,
1481                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1482 }
1483
1484 /**
1485  * zfcp_erp_unit_failed - Set unit status to failed.
1486  * @unit: Failed unit.
1487  * @id: Event id for debug trace.
1488  * @ref: Reference for debug trace.
1489  */
1490 void zfcp_erp_unit_failed(struct zfcp_unit *unit, u8 id, void *ref)
1491 {
1492         zfcp_erp_modify_unit_status(unit, id, ref,
1493                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1494 }
1495
1496 /**
1497  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1498  * @adapter: adapter for which to wait for completion of its error recovery
1499  */
1500 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1501 {
1502         wait_event(adapter->erp_done_wqh,
1503                    !(atomic_read(&adapter->status) &
1504                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1505 }
1506
1507 /**
1508  * zfcp_erp_modify_adapter_status - change adapter status bits
1509  * @adapter: adapter to change the status
1510  * @id: id for the debug trace
1511  * @ref: reference for the debug trace
1512  * @mask: status bits to change
1513  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1514  *
1515  * Changes in common status bits are propagated to attached ports and units.
1516  */
1517 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, u8 id,
1518                                     void *ref, u32 mask, int set_or_clear)
1519 {
1520         struct zfcp_port *port;
1521         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1522
1523         if (set_or_clear == ZFCP_SET) {
1524                 if (status_change_set(mask, &adapter->status))
1525                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1526                 atomic_set_mask(mask, &adapter->status);
1527         } else {
1528                 if (status_change_clear(mask, &adapter->status))
1529                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1530                 atomic_clear_mask(mask, &adapter->status);
1531                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1532                         atomic_set(&adapter->erp_counter, 0);
1533         }
1534
1535         if (common_mask)
1536                 list_for_each_entry(port, &adapter->port_list_head, list)
1537                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1538                                                     set_or_clear);
1539 }
1540
1541 /**
1542  * zfcp_erp_modify_port_status - change port status bits
1543  * @port: port to change the status bits
1544  * @id: id for the debug trace
1545  * @ref: reference for the debug trace
1546  * @mask: status bits to change
1547  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1548  *
1549  * Changes in common status bits are propagated to attached units.
1550  */
1551 void zfcp_erp_modify_port_status(struct zfcp_port *port, u8 id, void *ref,
1552                                  u32 mask, int set_or_clear)
1553 {
1554         struct zfcp_unit *unit;
1555         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1556
1557         if (set_or_clear == ZFCP_SET) {
1558                 if (status_change_set(mask, &port->status))
1559                         zfcp_rec_dbf_event_port(id, ref, port);
1560                 atomic_set_mask(mask, &port->status);
1561         } else {
1562                 if (status_change_clear(mask, &port->status))
1563                         zfcp_rec_dbf_event_port(id, ref, port);
1564                 atomic_clear_mask(mask, &port->status);
1565                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1566                         atomic_set(&port->erp_counter, 0);
1567         }
1568
1569         if (common_mask)
1570                 list_for_each_entry(unit, &port->unit_list_head, list)
1571                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1572                                                     set_or_clear);
1573 }
1574
1575 /**
1576  * zfcp_erp_modify_unit_status - change unit status bits
1577  * @unit: unit to change the status bits
1578  * @id: id for the debug trace
1579  * @ref: reference for the debug trace
1580  * @mask: status bits to change
1581  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1582  */
1583 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, u8 id, void *ref,
1584                                  u32 mask, int set_or_clear)
1585 {
1586         if (set_or_clear == ZFCP_SET) {
1587                 if (status_change_set(mask, &unit->status))
1588                         zfcp_rec_dbf_event_unit(id, ref, unit);
1589                 atomic_set_mask(mask, &unit->status);
1590         } else {
1591                 if (status_change_clear(mask, &unit->status))
1592                         zfcp_rec_dbf_event_unit(id, ref, unit);
1593                 atomic_clear_mask(mask, &unit->status);
1594                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1595                         atomic_set(&unit->erp_counter, 0);
1596                 }
1597         }
1598 }
1599
1600 /**
1601  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1602  * @port: The "boxed" port.
1603  * @id: The debug trace id.
1604  * @id: Reference for the debug trace.
1605  */
1606 void zfcp_erp_port_boxed(struct zfcp_port *port, u8 id, void *ref)
1607 {
1608         unsigned long flags;
1609
1610         read_lock_irqsave(&zfcp_data.config_lock, flags);
1611         zfcp_erp_modify_port_status(port, id, ref,
1612                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1613         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1614         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1615 }
1616
1617 /**
1618  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1619  * @port: The "boxed" unit.
1620  * @id: The debug trace id.
1621  * @id: Reference for the debug trace.
1622  */
1623 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, u8 id, void *ref)
1624 {
1625         zfcp_erp_modify_unit_status(unit, id, ref,
1626                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1627         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1628 }
1629
1630 /**
1631  * zfcp_erp_port_access_denied - Adapter denied access to port.
1632  * @port: port where access has been denied
1633  * @id: id for debug trace
1634  * @ref: reference for debug trace
1635  *
1636  * Since the adapter has denied access, stop using the port and the
1637  * attached units.
1638  */
1639 void zfcp_erp_port_access_denied(struct zfcp_port *port, u8 id, void *ref)
1640 {
1641         unsigned long flags;
1642
1643         read_lock_irqsave(&zfcp_data.config_lock, flags);
1644         zfcp_erp_modify_port_status(port, id, ref,
1645                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1646                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1647         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1648 }
1649
1650 /**
1651  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1652  * @unit: unit where access has been denied
1653  * @id: id for debug trace
1654  * @ref: reference for debug trace
1655  *
1656  * Since the adapter has denied access, stop using the unit.
1657  */
1658 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, u8 id, void *ref)
1659 {
1660         zfcp_erp_modify_unit_status(unit, id, ref,
1661                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1662                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1663 }
1664
1665 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, u8 id,
1666                                          void *ref)
1667 {
1668         int status = atomic_read(&unit->status);
1669         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1670                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1671                 return;
1672
1673         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1674 }
1675
1676 static void zfcp_erp_port_access_changed(struct zfcp_port *port, u8 id,
1677                                          void *ref)
1678 {
1679         struct zfcp_unit *unit;
1680         int status = atomic_read(&port->status);
1681
1682         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1683                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1684                 list_for_each_entry(unit, &port->unit_list_head, list)
1685                                     zfcp_erp_unit_access_changed(unit, id, ref);
1686                 return;
1687         }
1688
1689         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1690 }
1691
1692 /**
1693  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1694  * @adapter: Adapter where the Access Control Table (ACT) changed
1695  * @id: Id for debug trace
1696  * @ref: Reference for debug trace
1697  */
1698 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, u8 id,
1699                                      void *ref)
1700 {
1701         struct zfcp_port *port;
1702         unsigned long flags;
1703
1704         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1705                 return;
1706
1707         read_lock_irqsave(&zfcp_data.config_lock, flags);
1708         list_for_each_entry(port, &adapter->port_list_head, list)
1709                 zfcp_erp_port_access_changed(port, id, ref);
1710         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1711 }