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, "erablk1", NULL,
  59                                        ZFCP_STATUS_COMMON_UNBLOCKED | mask,
  60                                        ZFCP_CLEAR);
  61 }
  62
  63 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
  64 {
  65         struct zfcp_erp_action *curr_act;
  66
  67         list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
  68                 if (act == curr_act)
  69                         return ZFCP_ERP_ACTION_RUNNING;
  70         return 0;
  71 }
  72
  73 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
  74 {
  75         struct zfcp_adapter *adapter = act->adapter;
  76
  77         list_move(&act->list, &act->adapter->erp_ready_head);
  78         zfcp_rec_dbf_event_action("erardy1", act);
  79         up(&adapter->erp_ready_sem);
  80         zfcp_rec_dbf_event_thread("erardy2", adapter);
  81 }
  82
  83 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
  84 {
  85         act->status |= ZFCP_STATUS_ERP_DISMISSED;
  86         if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
  87                 zfcp_erp_action_ready(act);
  88 }
  89
  90 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
  91 {
  92         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
  93                 zfcp_erp_action_dismiss(&unit->erp_action);
  94 }
  95
  96 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
  97 {
  98         struct zfcp_unit *unit;
  99
 100         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 101                 zfcp_erp_action_dismiss(&port->erp_action);
 102         else
 103                 list_for_each_entry(unit, &port->unit_list_head, list)
 104                     zfcp_erp_action_dismiss_unit(unit);
 105 }
 106
 107 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 108 {
 109         struct zfcp_port *port;
 110
 111         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 112                 zfcp_erp_action_dismiss(&adapter->erp_action);
 113         else
 114                 list_for_each_entry(port, &adapter->port_list_head, list)
 115                     zfcp_erp_action_dismiss_port(port);
 116 }
 117
 118 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 119                                  struct zfcp_port *port,
 120                                  struct zfcp_unit *unit)
 121 {
 122         int need = want;
 123         int u_status, p_status, a_status;
 124
 125         switch (want) {
 126         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 127                 u_status = atomic_read(&unit->status);
 128                 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 129                         return 0;
 130                 p_status = atomic_read(&port->status);
 131                 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
 132                       p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 133                         return 0;
 134                 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 135                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 136                 /* fall through */
 137         case ZFCP_ERP_ACTION_REOPEN_PORT:
 138         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 139                 p_status = atomic_read(&port->status);
 140                 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 141                         return 0;
 142                 a_status = atomic_read(&adapter->status);
 143                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
 144                       a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 145                         return 0;
 146                 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 147                         need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
 148                 /* fall through */
 149         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 150                 a_status = atomic_read(&adapter->status);
 151                 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 152                         return 0;
 153         }
 154
 155         return need;
 156 }
 157
 158 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
 159                                                   struct zfcp_adapter *adapter,
 160                                                   struct zfcp_port *port,
 161                                                   struct zfcp_unit *unit)
 162 {
 163         struct zfcp_erp_action *erp_action;
 164         u32 status = 0;
 165
 166         switch (need) {
 167         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 168                 zfcp_unit_get(unit);
 169                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
 170                 erp_action = &unit->erp_action;
 171                 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
 172                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 173                 break;
 174
 175         case ZFCP_ERP_ACTION_REOPEN_PORT:
 176         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 177                 zfcp_port_get(port);
 178                 zfcp_erp_action_dismiss_port(port);
 179                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
 180                 erp_action = &port->erp_action;
 181                 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
 182                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 183                 break;
 184
 185         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 186                 zfcp_adapter_get(adapter);
 187                 zfcp_erp_action_dismiss_adapter(adapter);
 188                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
 189                 erp_action = &adapter->erp_action;
 190                 if (!(atomic_read(&adapter->status) &
 191                       ZFCP_STATUS_COMMON_RUNNING))
 192                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 193                 break;
 194
 195         default:
 196                 return NULL;
 197         }
 198
 199         memset(erp_action, 0, sizeof(struct zfcp_erp_action));
 200         erp_action->adapter = adapter;
 201         erp_action->port = port;
 202         erp_action->unit = unit;
 203         erp_action->action = need;
 204         erp_action->status = status;
 205
 206         return erp_action;
 207 }
 208
 209 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 210                                    struct zfcp_port *port,
 211                                    struct zfcp_unit *unit, char *id, void *ref)
 212 {
 213         int retval = 1, need;
 214         struct zfcp_erp_action *act = NULL;
 215
 216         if (!(atomic_read(&adapter->status) &
 217               ZFCP_STATUS_ADAPTER_ERP_THREAD_UP))
 218                 return -EIO;
 219
 220         need = zfcp_erp_required_act(want, adapter, port, unit);
 221         if (!need)
 222                 goto out;
 223
 224         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 225         act = zfcp_erp_setup_act(need, adapter, port, unit);
 226         if (!act)
 227                 goto out;
 228         ++adapter->erp_total_count;
 229         list_add_tail(&act->list, &adapter->erp_ready_head);
 230         up(&adapter->erp_ready_sem);
 231         zfcp_rec_dbf_event_thread("eracte1", adapter);
 232         retval = 0;
 233  out:
 234         zfcp_rec_dbf_event_trigger(id, ref, want, need, act,
 235                                    adapter, port, unit);
 236         return retval;
 237 }
 238
 239 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 240                                     int clear_mask, char *id, void *ref)
 241 {
 242         zfcp_erp_adapter_block(adapter, clear_mask);
 243
 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, "erareo1", 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                              char *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                                char *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, char *id,
 294                             void *ref)
 295 {
 296         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 297         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 298 }
 299
 300 /**
 301  * zfcp_erp_unit_shutdown - Shutdown unit
 302  * @unit: Unit to shut down.
 303  * @clear: Status flags to clear.
 304  * @id: Id for debug trace event.
 305  * @ref: Reference for debug trace event.
 306  */
 307 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
 308                             void *ref)
 309 {
 310         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 311         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 312 }
 313
 314 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 315 {
 316         zfcp_erp_modify_port_status(port, "erpblk1", NULL,
 317                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 318                                     ZFCP_CLEAR);
 319 }
 320
 321 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 322                                          int clear, char *id, void *ref)
 323 {
 324         zfcp_erp_port_block(port, clear);
 325
 326         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 327                 return;
 328
 329         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 330                                 port->adapter, port, NULL, id, ref);
 331 }
 332
 333 /**
 334  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 335  * @port: Port to force close and to reopen.
 336  * @id: Id for debug trace event.
 337  * @ref: Reference for debug trace event.
 338  */
 339 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id,
 340                                  void *ref)
 341 {
 342         unsigned long flags;
 343         struct zfcp_adapter *adapter = port->adapter;
 344
 345         read_lock_irqsave(&zfcp_data.config_lock, flags);
 346         write_lock(&adapter->erp_lock);
 347         _zfcp_erp_port_forced_reopen(port, clear, id, ref);
 348         write_unlock(&adapter->erp_lock);
 349         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 350 }
 351
 352 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id,
 353                                  void *ref)
 354 {
 355         zfcp_erp_port_block(port, clear);
 356
 357         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 358                 /* ensure propagation of failed status to new devices */
 359                 zfcp_erp_port_failed(port, "erpreo1", NULL);
 360                 return -EIO;
 361         }
 362
 363         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 364                                        port->adapter, port, NULL, id, ref);
 365 }
 366
 367 /**
 368  * zfcp_erp_port_reopen - trigger remote port recovery
 369  * @port: port to recover
 370  * @clear_mask: flags in port status to be cleared
 371  *
 372  * Returns 0 if recovery has been triggered, < 0 if not.
 373  */
 374 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
 375 {
 376         unsigned long flags;
 377         int retval;
 378         struct zfcp_adapter *adapter = port->adapter;
 379
 380         read_lock_irqsave(&zfcp_data.config_lock, flags);
 381         write_lock(&adapter->erp_lock);
 382         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 383         write_unlock(&adapter->erp_lock);
 384         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 385
 386         return retval;
 387 }
 388
 389 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 390 {
 391         zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
 392                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 393                                     ZFCP_CLEAR);
 394 }
 395
 396 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 397                                   void *ref)
 398 {
 399         struct zfcp_adapter *adapter = unit->port->adapter;
 400
 401         zfcp_erp_unit_block(unit, clear);
 402
 403         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 404                 return;
 405
 406         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 407                                 adapter, unit->port, unit, id, ref);
 408 }
 409
 410 /**
 411  * zfcp_erp_unit_reopen - initiate reopen of a unit
 412  * @unit: unit to be reopened
 413  * @clear_mask: specifies flags in unit status to be cleared
 414  * Return: 0 on success, < 0 on error
 415  */
 416 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 417                           void *ref)
 418 {
 419         unsigned long flags;
 420         struct zfcp_port *port = unit->port;
 421         struct zfcp_adapter *adapter = port->adapter;
 422
 423         read_lock_irqsave(&zfcp_data.config_lock, flags);
 424         write_lock(&adapter->erp_lock);
 425         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 426         write_unlock(&adapter->erp_lock);
 427         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 428 }
 429
 430 static int status_change_set(unsigned long mask, atomic_t *status)
 431 {
 432         return (atomic_read(status) ^ mask) & mask;
 433 }
 434
 435 static int status_change_clear(unsigned long mask, atomic_t *status)
 436 {
 437         return atomic_read(status) & mask;
 438 }
 439
 440 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 441 {
 442         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 443                 zfcp_rec_dbf_event_adapter("eraubl1", NULL, adapter);
 444         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 445 }
 446
 447 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 448 {
 449         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 450                 zfcp_rec_dbf_event_port("erpubl1", NULL, port);
 451         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 452 }
 453
 454 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 455 {
 456         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 457                 zfcp_rec_dbf_event_unit("eruubl1", NULL, unit);
 458         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 459 }
 460
 461 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 462 {
 463         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 464         zfcp_rec_dbf_event_action("erator1", erp_action);
 465 }
 466
 467 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 468 {
 469         struct zfcp_adapter *adapter = act->adapter;
 470
 471         if (!act->fsf_req)
 472                 return;
 473
 474         spin_lock(&adapter->req_list_lock);
 475         if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
 476             act->fsf_req->erp_action == act) {
 477                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 478                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 479                         act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 480                         zfcp_rec_dbf_event_action("erscf_1", act);
 481                         act->fsf_req->erp_action = NULL;
 482                 }
 483                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 484                         zfcp_rec_dbf_event_action("erscf_2", act);
 485                 if (act->fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
 486                                             ZFCP_STATUS_FSFREQ_DISMISSED))
 487                         act->fsf_req = NULL;
 488         } else
 489                 act->fsf_req = NULL;
 490         spin_unlock(&adapter->req_list_lock);
 491 }
 492
 493 /**
 494  * zfcp_erp_notify - Trigger ERP action.
 495  * @erp_action: ERP action to continue.
 496  * @set_mask: ERP action status flags to set.
 497  */
 498 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 499 {
 500         struct zfcp_adapter *adapter = erp_action->adapter;
 501         unsigned long flags;
 502
 503         write_lock_irqsave(&adapter->erp_lock, flags);
 504         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 505                 erp_action->status |= set_mask;
 506                 zfcp_erp_action_ready(erp_action);
 507         }
 508         write_unlock_irqrestore(&adapter->erp_lock, flags);
 509 }
 510
 511 /**
 512  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 513  * @data: ERP action (from timer data)
 514  */
 515 void zfcp_erp_timeout_handler(unsigned long data)
 516 {
 517         struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
 518         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 519 }
 520
 521 static void zfcp_erp_memwait_handler(unsigned long data)
 522 {
 523         zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
 524 }
 525
 526 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 527 {
 528         init_timer(&erp_action->timer);
 529         erp_action->timer.function = zfcp_erp_memwait_handler;
 530         erp_action->timer.data = (unsigned long) erp_action;
 531         erp_action->timer.expires = jiffies + HZ;
 532         add_timer(&erp_action->timer);
 533 }
 534
 535 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 536                                       int clear, char *id, void *ref)
 537 {
 538         struct zfcp_port *port;
 539
 540         list_for_each_entry(port, &adapter->port_list_head, list)
 541                 _zfcp_erp_port_reopen(port, clear, id, ref);
 542 }
 543
 544 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
 545                                       char *id, void *ref)
 546 {
 547         struct zfcp_unit *unit;
 548
 549         list_for_each_entry(unit, &port->unit_list_head, list)
 550                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 551 }
 552
 553 static void zfcp_erp_strategy_followup_actions(struct zfcp_erp_action *act)
 554 {
 555         struct zfcp_adapter *adapter = act->adapter;
 556         struct zfcp_port *port = act->port;
 557         struct zfcp_unit *unit = act->unit;
 558         u32 status = act->status;
 559
 560         /* initiate follow-up actions depending on success of finished action */
 561         switch (act->action) {
 562
 563         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 564                 if (status == ZFCP_ERP_SUCCEEDED)
 565                         _zfcp_erp_port_reopen_all(adapter, 0, "ersfa_1", NULL);
 566                 else
 567                         _zfcp_erp_adapter_reopen(adapter, 0, "ersfa_2", NULL);
 568                 break;
 569
 570         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 571                 if (status == ZFCP_ERP_SUCCEEDED)
 572                         _zfcp_erp_port_reopen(port, 0, "ersfa_3", NULL);
 573                 else
 574                         _zfcp_erp_adapter_reopen(adapter, 0, "ersfa_4", NULL);
 575                 break;
 576
 577         case ZFCP_ERP_ACTION_REOPEN_PORT:
 578                 if (status == ZFCP_ERP_SUCCEEDED)
 579                         _zfcp_erp_unit_reopen_all(port, 0, "ersfa_5", NULL);
 580                 else
 581                         _zfcp_erp_port_forced_reopen(port, 0, "ersfa_6", NULL);
 582                 break;
 583
 584         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 585                 if (status != ZFCP_ERP_SUCCEEDED)
 586                         _zfcp_erp_port_reopen(unit->port, 0, "ersfa_7", NULL);
 587                 break;
 588         }
 589 }
 590
 591 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 592 {
 593         unsigned long flags;
 594
 595         read_lock_irqsave(&zfcp_data.config_lock, flags);
 596         read_lock(&adapter->erp_lock);
 597         if (list_empty(&adapter->erp_ready_head) &&
 598             list_empty(&adapter->erp_running_head)) {
 599                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 600                                           &adapter->status);
 601                         wake_up(&adapter->erp_done_wqh);
 602         }
 603         read_unlock(&adapter->erp_lock);
 604         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 605 }
 606
 607 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 608 {
 609         if (zfcp_qdio_open(act->adapter))
 610                 return ZFCP_ERP_FAILED;
 611         init_waitqueue_head(&act->adapter->request_wq);
 612         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 613         return ZFCP_ERP_SUCCEEDED;
 614 }
 615
 616 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 617 {
 618         struct zfcp_port *port;
 619         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 620                                  adapter->peer_d_id);
 621         if (IS_ERR(port)) /* error or port already attached */
 622                 return;
 623         _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
 624 }
 625
 626 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 627 {
 628         int retries;
 629         int sleep = 1;
 630         struct zfcp_adapter *adapter = erp_action->adapter;
 631
 632         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 633
 634         for (retries = 7; retries; retries--) {
 635                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 636                                   &adapter->status);
 637                 write_lock_irq(&adapter->erp_lock);
 638                 zfcp_erp_action_to_running(erp_action);
 639                 write_unlock_irq(&adapter->erp_lock);
 640                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 641                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 642                                           &adapter->status);
 643                         return ZFCP_ERP_FAILED;
 644                 }
 645
 646                 zfcp_rec_dbf_event_thread_lock("erasfx1", adapter);
 647                 down(&adapter->erp_ready_sem);
 648                 zfcp_rec_dbf_event_thread_lock("erasfx2", adapter);
 649                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 650                         break;
 651
 652                 if (!(atomic_read(&adapter->status) &
 653                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 654                         break;
 655
 656                 ssleep(sleep);
 657                 sleep *= 2;
 658         }
 659
 660         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 661                           &adapter->status);
 662
 663         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 664                 return ZFCP_ERP_FAILED;
 665
 666         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 667                 zfcp_erp_enqueue_ptp_port(adapter);
 668
 669         return ZFCP_ERP_SUCCEEDED;
 670 }
 671
 672 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 673 {
 674         int ret;
 675         struct zfcp_adapter *adapter = act->adapter;
 676
 677         write_lock_irq(&adapter->erp_lock);
 678         zfcp_erp_action_to_running(act);
 679         write_unlock_irq(&adapter->erp_lock);
 680
 681         ret = zfcp_fsf_exchange_port_data(act);
 682         if (ret == -EOPNOTSUPP)
 683                 return ZFCP_ERP_SUCCEEDED;
 684         if (ret)
 685                 return ZFCP_ERP_FAILED;
 686
 687         zfcp_rec_dbf_event_thread_lock("erasox1", adapter);
 688         down(&adapter->erp_ready_sem);
 689         zfcp_rec_dbf_event_thread_lock("erasox2", adapter);
 690         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 691                 return ZFCP_ERP_FAILED;
 692
 693         return ZFCP_ERP_SUCCEEDED;
 694 }
 695
 696 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 697 {
 698         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 699                 return ZFCP_ERP_FAILED;
 700
 701         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 702                 return ZFCP_ERP_FAILED;
 703
 704         atomic_set(&act->adapter->stat_miss, 16);
 705         if (zfcp_status_read_refill(act->adapter))
 706                 return ZFCP_ERP_FAILED;
 707
 708         return ZFCP_ERP_SUCCEEDED;
 709 }
 710
 711 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 712 {
 713         struct zfcp_adapter *adapter = act->adapter;
 714
 715         /* close queues to ensure that buffers are not accessed by adapter */
 716         zfcp_qdio_close(adapter);
 717         zfcp_fsf_req_dismiss_all(adapter);
 718         adapter->fsf_req_seq_no = 0;
 719         /* all ports and units are closed */
 720         zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
 721                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 722
 723         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 724                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 725 }
 726
 727 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
 728 {
 729         struct zfcp_adapter *adapter = act->adapter;
 730
 731         if (zfcp_erp_adapter_strategy_open_qdio(act)) {
 732                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 733                                   ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 734                                   &adapter->status);
 735                 return ZFCP_ERP_FAILED;
 736         }
 737
 738         if (zfcp_erp_adapter_strategy_open_fsf(act)) {
 739                 zfcp_erp_adapter_strategy_close(act);
 740                 return ZFCP_ERP_FAILED;
 741         }
 742
 743         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
 744
 745         return ZFCP_ERP_SUCCEEDED;
 746 }
 747
 748 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 749 {
 750         struct zfcp_adapter *adapter = act->adapter;
 751
 752         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
 753                 zfcp_erp_adapter_strategy_close(act);
 754                 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 755                         return ZFCP_ERP_EXIT;
 756         }
 757
 758         if (zfcp_erp_adapter_strategy_open(act)) {
 759                 ssleep(8);
 760                 return ZFCP_ERP_FAILED;
 761         }
 762
 763         return ZFCP_ERP_SUCCEEDED;
 764 }
 765
 766 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 767 {
 768         int retval;
 769
 770         retval = zfcp_fsf_close_physical_port(act);
 771         if (retval == -ENOMEM)
 772                 return ZFCP_ERP_NOMEM;
 773         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 774         if (retval)
 775                 return ZFCP_ERP_FAILED;
 776
 777         return ZFCP_ERP_CONTINUES;
 778 }
 779
 780 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 781 {
 782         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
 783 }
 784
 785 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 786 {
 787         struct zfcp_port *port = erp_action->port;
 788         int status = atomic_read(&port->status);
 789
 790         switch (erp_action->step) {
 791         case ZFCP_ERP_STEP_UNINITIALIZED:
 792                 zfcp_erp_port_strategy_clearstati(port);
 793                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 794                     (status & ZFCP_STATUS_COMMON_OPEN))
 795                         return zfcp_erp_port_forced_strategy_close(erp_action);
 796                 else
 797                         return ZFCP_ERP_FAILED;
 798
 799         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 800                 if (status & ZFCP_STATUS_PORT_PHYS_OPEN)
 801                         return ZFCP_ERP_SUCCEEDED;
 802         }
 803         return ZFCP_ERP_FAILED;
 804 }
 805
 806 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 807 {
 808         int retval;
 809
 810         retval = zfcp_fsf_close_port(erp_action);
 811         if (retval == -ENOMEM)
 812                 return ZFCP_ERP_NOMEM;
 813         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 814         if (retval)
 815                 return ZFCP_ERP_FAILED;
 816         return ZFCP_ERP_CONTINUES;
 817 }
 818
 819 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 820 {
 821         int retval;
 822
 823         retval = zfcp_fsf_open_port(erp_action);
 824         if (retval == -ENOMEM)
 825                 return ZFCP_ERP_NOMEM;
 826         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 827         if (retval)
 828                 return ZFCP_ERP_FAILED;
 829         return ZFCP_ERP_CONTINUES;
 830 }
 831
 832 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 833 {
 834         struct zfcp_adapter *adapter = act->adapter;
 835         struct zfcp_port *port = act->port;
 836
 837         if (port->wwpn != adapter->peer_wwpn) {
 838                 zfcp_erp_port_failed(port, "eroptp1", NULL);
 839                 return ZFCP_ERP_FAILED;
 840         }
 841         port->d_id = adapter->peer_d_id;
 842         return zfcp_erp_port_strategy_open_port(act);
 843 }
 844
 845 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
 846 {
 847         int retval;
 848         struct zfcp_port *port = container_of(work, struct zfcp_port,
 849                                               gid_pn_work);
 850
 851         retval = zfcp_fc_ns_gid_pn(&port->erp_action);
 852         if (retval == -ENOMEM)
 853                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_NOMEM);
 854         port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
 855         if (retval)
 856                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_FAILED);
 857
 858 }
 859
 860 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 861 {
 862         struct zfcp_adapter *adapter = act->adapter;
 863         struct zfcp_port *port = act->port;
 864         int p_status = atomic_read(&port->status);
 865
 866         switch (act->step) {
 867         case ZFCP_ERP_STEP_UNINITIALIZED:
 868         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 869         case ZFCP_ERP_STEP_PORT_CLOSING:
 870                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 871                         return zfcp_erp_open_ptp_port(act);
 872                 if (!port->d_id) {
 873                         queue_work(zfcp_data.work_queue, &port->gid_pn_work);
 874                         return ZFCP_ERP_CONTINUES;
 875                 }
 876         case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
 877                 if (!port->d_id)
 878                         return ZFCP_ERP_FAILED;
 879                 return zfcp_erp_port_strategy_open_port(act);
 880
 881         case ZFCP_ERP_STEP_PORT_OPENING:
 882                 /* D_ID might have changed during open */
 883                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 884                         if (port->d_id)
 885                                 return ZFCP_ERP_SUCCEEDED;
 886                         else {
 887                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 888                                 return ZFCP_ERP_CONTINUES;
 889                         }
 890                 /* fall through otherwise */
 891                 }
 892         }
 893         return ZFCP_ERP_FAILED;
 894 }
 895
 896 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 897 {
 898         struct zfcp_port *port = erp_action->port;
 899
 900         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 901                 goto close_init_done;
 902
 903         switch (erp_action->step) {
 904         case ZFCP_ERP_STEP_UNINITIALIZED:
 905                 zfcp_erp_port_strategy_clearstati(port);
 906                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 907                         return zfcp_erp_port_strategy_close(erp_action);
 908                 break;
 909
 910         case ZFCP_ERP_STEP_PORT_CLOSING:
 911                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 912                         return ZFCP_ERP_FAILED;
 913                 break;
 914         }
 915
 916 close_init_done:
 917         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 918                 return ZFCP_ERP_EXIT;
 919
 920         return zfcp_erp_port_strategy_open_common(erp_action);
 921 }
 922
 923 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 924 {
 925         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 926                           ZFCP_STATUS_UNIT_SHARED |
 927                           ZFCP_STATUS_UNIT_READONLY,
 928                           &unit->status);
 929 }
 930
 931 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 932 {
 933         int retval = zfcp_fsf_close_unit(erp_action);
 934         if (retval == -ENOMEM)
 935                 return ZFCP_ERP_NOMEM;
 936         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 937         if (retval)
 938                 return ZFCP_ERP_FAILED;
 939         return ZFCP_ERP_CONTINUES;
 940 }
 941
 942 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 943 {
 944         int retval = zfcp_fsf_open_unit(erp_action);
 945         if (retval == -ENOMEM)
 946                 return ZFCP_ERP_NOMEM;
 947         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 948         if (retval)
 949                 return  ZFCP_ERP_FAILED;
 950         return ZFCP_ERP_CONTINUES;
 951 }
 952
 953 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 954 {
 955         struct zfcp_unit *unit = erp_action->unit;
 956
 957         switch (erp_action->step) {
 958         case ZFCP_ERP_STEP_UNINITIALIZED:
 959                 zfcp_erp_unit_strategy_clearstati(unit);
 960                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 961                         return zfcp_erp_unit_strategy_close(erp_action);
 962                 /* already closed, fall through */
 963         case ZFCP_ERP_STEP_UNIT_CLOSING:
 964                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 965                         return ZFCP_ERP_FAILED;
 966                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 967                         return ZFCP_ERP_EXIT;
 968                 return zfcp_erp_unit_strategy_open(erp_action);
 969
 970         case ZFCP_ERP_STEP_UNIT_OPENING:
 971                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 972                         return ZFCP_ERP_SUCCEEDED;
 973         }
 974         return ZFCP_ERP_FAILED;
 975 }
 976
 977 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 978 {
 979         switch (result) {
 980         case ZFCP_ERP_SUCCEEDED :
 981                 atomic_set(&unit->erp_counter, 0);
 982                 zfcp_erp_unit_unblock(unit);
 983                 break;
 984         case ZFCP_ERP_FAILED :
 985                 atomic_inc(&unit->erp_counter);
 986                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
 987                         dev_err(&unit->port->adapter->ccw_device->dev,
 988                                 "ERP failed for unit 0x%016Lx on "
 989                                 "port 0x%016Lx\n",
 990                                 (unsigned long long)unit->fcp_lun,
 991                                 (unsigned long long)unit->port->wwpn);
 992                         zfcp_erp_unit_failed(unit, "erusck1", NULL);
 993                 }
 994                 break;
 995         }
 996
 997         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 998                 zfcp_erp_unit_block(unit, 0);
 999                 result = ZFCP_ERP_EXIT;
1000         }
1001         return result;
1002 }
1003
1004 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1005 {
1006         switch (result) {
1007         case ZFCP_ERP_SUCCEEDED :
1008                 atomic_set(&port->erp_counter, 0);
1009                 zfcp_erp_port_unblock(port);
1010                 break;
1011
1012         case ZFCP_ERP_FAILED :
1013                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1014                         zfcp_erp_port_block(port, 0);
1015                         result = ZFCP_ERP_EXIT;
1016                 }
1017                 atomic_inc(&port->erp_counter);
1018                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1019                         dev_err(&port->adapter->ccw_device->dev,
1020                                 "ERP failed for remote port 0x%016Lx\n",
1021                                 (unsigned long long)port->wwpn);
1022                         zfcp_erp_port_failed(port, "erpsck1", NULL);
1023                 }
1024                 break;
1025         }
1026
1027         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1028                 zfcp_erp_port_block(port, 0);
1029                 result = ZFCP_ERP_EXIT;
1030         }
1031         return result;
1032 }
1033
1034 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1035                                            int result)
1036 {
1037         switch (result) {
1038         case ZFCP_ERP_SUCCEEDED :
1039                 atomic_set(&adapter->erp_counter, 0);
1040                 zfcp_erp_adapter_unblock(adapter);
1041                 break;
1042
1043         case ZFCP_ERP_FAILED :
1044                 atomic_inc(&adapter->erp_counter);
1045                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1046                         dev_err(&adapter->ccw_device->dev,
1047                                 "ERP cannot recover an error "
1048                                 "on the FCP device\n");
1049                         zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1050                 }
1051                 break;
1052         }
1053
1054         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1055                 zfcp_erp_adapter_block(adapter, 0);
1056                 result = ZFCP_ERP_EXIT;
1057         }
1058         return result;
1059 }
1060
1061 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1062                                           int result)
1063 {
1064         struct zfcp_adapter *adapter = erp_action->adapter;
1065         struct zfcp_port *port = erp_action->port;
1066         struct zfcp_unit *unit = erp_action->unit;
1067
1068         switch (erp_action->action) {
1069
1070         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1071                 result = zfcp_erp_strategy_check_unit(unit, result);
1072                 break;
1073
1074         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1075         case ZFCP_ERP_ACTION_REOPEN_PORT:
1076                 result = zfcp_erp_strategy_check_port(port, result);
1077                 break;
1078
1079         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1080                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1081                 break;
1082         }
1083         return result;
1084 }
1085
1086 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1087 {
1088         int status = atomic_read(target_status);
1089
1090         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1091             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1092                 return 1; /* take it online */
1093
1094         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1095             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1096                 return 1; /* take it offline */
1097
1098         return 0;
1099 }
1100
1101 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1102 {
1103         int action = act->action;
1104         struct zfcp_adapter *adapter = act->adapter;
1105         struct zfcp_port *port = act->port;
1106         struct zfcp_unit *unit = act->unit;
1107         u32 erp_status = act->status;
1108
1109         switch (action) {
1110         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1111                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1112                         _zfcp_erp_adapter_reopen(adapter,
1113                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1114                                                  "ersscg1", NULL);
1115                         return ZFCP_ERP_EXIT;
1116                 }
1117                 break;
1118
1119         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1120         case ZFCP_ERP_ACTION_REOPEN_PORT:
1121                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1122                         _zfcp_erp_port_reopen(port,
1123                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1124                                               "ersscg2", NULL);
1125                         return ZFCP_ERP_EXIT;
1126                 }
1127                 break;
1128
1129         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1130                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1131                         _zfcp_erp_unit_reopen(unit,
1132                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1133                                               "ersscg3", NULL);
1134                         return ZFCP_ERP_EXIT;
1135                 }
1136                 break;
1137         }
1138         return ret;
1139 }
1140
1141 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1142 {
1143         struct zfcp_adapter *adapter = erp_action->adapter;
1144
1145         adapter->erp_total_count--;
1146         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1147                 adapter->erp_low_mem_count--;
1148                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1149         }
1150
1151         list_del(&erp_action->list);
1152         zfcp_rec_dbf_event_action("eractd1", erp_action);
1153
1154         switch (erp_action->action) {
1155         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1156                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1157                                   &erp_action->unit->status);
1158                 break;
1159
1160         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1161         case ZFCP_ERP_ACTION_REOPEN_PORT:
1162                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1163                                   &erp_action->port->status);
1164                 break;
1165
1166         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1167                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1168                                   &erp_action->adapter->status);
1169                 break;
1170         }
1171 }
1172
1173 struct zfcp_erp_add_work {
1174         struct zfcp_unit  *unit;
1175         struct work_struct work;
1176 };
1177
1178 static void zfcp_erp_scsi_scan(struct work_struct *work)
1179 {
1180         struct zfcp_erp_add_work *p =
1181                 container_of(work, struct zfcp_erp_add_work, work);
1182         struct zfcp_unit *unit = p->unit;
1183         struct fc_rport *rport = unit->port->rport;
1184
1185         if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
1186                 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
1187                          scsilun_to_int((struct scsi_lun *)&unit->fcp_lun), 0);
1188         atomic_clear_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1189         zfcp_unit_put(unit);
1190         wake_up(&unit->port->adapter->erp_done_wqh);
1191         kfree(p);
1192 }
1193
1194 static void zfcp_erp_schedule_work(struct zfcp_unit *unit)
1195 {
1196         struct zfcp_erp_add_work *p;
1197
1198         p = kzalloc(sizeof(*p), GFP_KERNEL);
1199         if (!p) {
1200                 dev_err(&unit->port->adapter->ccw_device->dev,
1201                         "Registering unit 0x%016Lx on port 0x%016Lx failed\n",
1202                         (unsigned long long)unit->fcp_lun,
1203                         (unsigned long long)unit->port->wwpn);
1204                 return;
1205         }
1206
1207         zfcp_unit_get(unit);
1208         atomic_set_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1209         INIT_WORK(&p->work, zfcp_erp_scsi_scan);
1210         p->unit = unit;
1211         queue_work(zfcp_data.work_queue, &p->work);
1212 }
1213
1214 static void zfcp_erp_rport_register(struct zfcp_port *port)
1215 {
1216         struct fc_rport_identifiers ids;
1217         ids.node_name = port->wwnn;
1218         ids.port_name = port->wwpn;
1219         ids.port_id = port->d_id;
1220         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
1221         port->rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
1222         if (!port->rport) {
1223                 dev_err(&port->adapter->ccw_device->dev,
1224                         "Registering port 0x%016Lx failed\n",
1225                         (unsigned long long)port->wwpn);
1226                 return;
1227         }
1228
1229         scsi_target_unblock(&port->rport->dev);
1230         port->rport->maxframe_size = port->maxframe_size;
1231         port->rport->supported_classes = port->supported_classes;
1232 }
1233
1234 static void zfcp_erp_rports_del(struct zfcp_adapter *adapter)
1235 {
1236         struct zfcp_port *port;
1237         list_for_each_entry(port, &adapter->port_list_head, list) {
1238                 if (!port->rport)
1239                         continue;
1240                 fc_remote_port_delete(port->rport);
1241                 port->rport = NULL;
1242         }
1243 }
1244
1245 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1246 {
1247         struct zfcp_adapter *adapter = act->adapter;
1248         struct zfcp_port *port = act->port;
1249         struct zfcp_unit *unit = act->unit;
1250
1251         switch (act->action) {
1252         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1253                 if ((result == ZFCP_ERP_SUCCEEDED) &&
1254                     !unit->device && port->rport) {
1255                         if (!(atomic_read(&unit->status) &
1256                               ZFCP_STATUS_UNIT_SCSI_WORK_PENDING))
1257                                 zfcp_erp_schedule_work(unit);
1258                 }
1259                 zfcp_unit_put(unit);
1260                 break;
1261
1262         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1263         case ZFCP_ERP_ACTION_REOPEN_PORT:
1264                 if ((result == ZFCP_ERP_SUCCEEDED) && !port->rport)
1265                         zfcp_erp_rport_register(port);
1266                 if ((result != ZFCP_ERP_SUCCEEDED) && port->rport) {
1267                         fc_remote_port_delete(port->rport);
1268                         port->rport = NULL;
1269                 }
1270                 zfcp_port_put(port);
1271                 break;
1272
1273         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1274                 if (result != ZFCP_ERP_SUCCEEDED) {
1275                         unregister_service_level(&adapter->service_level);
1276                         zfcp_erp_rports_del(adapter);
1277                 } else {
1278                         register_service_level(&adapter->service_level);
1279                         schedule_work(&adapter->scan_work);
1280                 }
1281                 zfcp_adapter_put(adapter);
1282                 break;
1283         }
1284 }
1285
1286 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1287 {
1288         switch (erp_action->action) {
1289         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1290                 return zfcp_erp_adapter_strategy(erp_action);
1291         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1292                 return zfcp_erp_port_forced_strategy(erp_action);
1293         case ZFCP_ERP_ACTION_REOPEN_PORT:
1294                 return zfcp_erp_port_strategy(erp_action);
1295         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1296                 return zfcp_erp_unit_strategy(erp_action);
1297         }
1298         return ZFCP_ERP_FAILED;
1299 }
1300
1301 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1302 {
1303         int retval;
1304         struct zfcp_adapter *adapter = erp_action->adapter;
1305         unsigned long flags;
1306
1307         read_lock_irqsave(&zfcp_data.config_lock, flags);
1308         write_lock(&adapter->erp_lock);
1309
1310         zfcp_erp_strategy_check_fsfreq(erp_action);
1311
1312         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1313                 zfcp_erp_action_dequeue(erp_action);
1314                 retval = ZFCP_ERP_DISMISSED;
1315                 goto unlock;
1316         }
1317
1318         zfcp_erp_action_to_running(erp_action);
1319
1320         /* no lock to allow for blocking operations */
1321         write_unlock(&adapter->erp_lock);
1322         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1323         retval = zfcp_erp_strategy_do_action(erp_action);
1324         read_lock_irqsave(&zfcp_data.config_lock, flags);
1325         write_lock(&adapter->erp_lock);
1326
1327         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1328                 retval = ZFCP_ERP_CONTINUES;
1329
1330         switch (retval) {
1331         case ZFCP_ERP_NOMEM:
1332                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1333                         ++adapter->erp_low_mem_count;
1334                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1335                 }
1336                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1337                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1338                 else {
1339                         zfcp_erp_strategy_memwait(erp_action);
1340                         retval = ZFCP_ERP_CONTINUES;
1341                 }
1342                 goto unlock;
1343
1344         case ZFCP_ERP_CONTINUES:
1345                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1346                         --adapter->erp_low_mem_count;
1347                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1348                 }
1349                 goto unlock;
1350         }
1351
1352         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1353         zfcp_erp_action_dequeue(erp_action);
1354         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1355         if (retval == ZFCP_ERP_EXIT)
1356                 goto unlock;
1357         zfcp_erp_strategy_followup_actions(erp_action);
1358
1359  unlock:
1360         write_unlock(&adapter->erp_lock);
1361         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1362
1363         if (retval != ZFCP_ERP_CONTINUES)
1364                 zfcp_erp_action_cleanup(erp_action, retval);
1365
1366         return retval;
1367 }
1368
1369 static int zfcp_erp_thread(void *data)
1370 {
1371         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1372         struct list_head *next;
1373         struct zfcp_erp_action *act;
1374         unsigned long flags;
1375         int ignore;
1376
1377         daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1378         /* Block all signals */
1379         siginitsetinv(&current->blocked, 0);
1380         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1381         wake_up(&adapter->erp_thread_wqh);
1382
1383         while (!(atomic_read(&adapter->status) &
1384                  ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1385                 write_lock_irqsave(&adapter->erp_lock, flags);
1386                 next = adapter->erp_ready_head.next;
1387                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1388
1389                 if (next != &adapter->erp_ready_head) {
1390                         act = list_entry(next, struct zfcp_erp_action, list);
1391
1392                         /* there is more to come after dismission, no notify */
1393                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1394                                 zfcp_erp_wakeup(adapter);
1395                 }
1396
1397                 zfcp_rec_dbf_event_thread_lock("erthrd1", adapter);
1398                 ignore = down_interruptible(&adapter->erp_ready_sem);
1399                 zfcp_rec_dbf_event_thread_lock("erthrd2", adapter);
1400         }
1401
1402         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1403         wake_up(&adapter->erp_thread_wqh);
1404
1405         return 0;
1406 }
1407
1408 /**
1409  * zfcp_erp_thread_setup - Start ERP thread for adapter
1410  * @adapter: Adapter to start the ERP thread for
1411  *
1412  * Returns 0 on success or error code from kernel_thread()
1413  */
1414 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1415 {
1416         int retval;
1417
1418         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1419         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1420         if (retval < 0) {
1421                 dev_err(&adapter->ccw_device->dev,
1422                         "Creating an ERP thread for the FCP device failed.\n");
1423                 return retval;
1424         }
1425         wait_event(adapter->erp_thread_wqh,
1426                    atomic_read(&adapter->status) &
1427                         ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1428         return 0;
1429 }
1430
1431 /**
1432  * zfcp_erp_thread_kill - Stop ERP thread.
1433  * @adapter: Adapter where the ERP thread should be stopped.
1434  *
1435  * The caller of this routine ensures that the specified adapter has
1436  * been shut down and that this operation has been completed. Thus,
1437  * there are no pending erp_actions which would need to be handled
1438  * here.
1439  */
1440 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1441 {
1442         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1443         up(&adapter->erp_ready_sem);
1444         zfcp_rec_dbf_event_thread_lock("erthrk1", adapter);
1445
1446         wait_event(adapter->erp_thread_wqh,
1447                    !(atomic_read(&adapter->status) &
1448                                 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1449
1450         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1451                           &adapter->status);
1452 }
1453
1454 /**
1455  * zfcp_erp_adapter_failed - Set adapter status to failed.
1456  * @adapter: Failed adapter.
1457  * @id: Event id for debug trace.
1458  * @ref: Reference for debug trace.
1459  */
1460 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1461 {
1462         zfcp_erp_modify_adapter_status(adapter, id, ref,
1463                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1464 }
1465
1466 /**
1467  * zfcp_erp_port_failed - Set port status to failed.
1468  * @port: Failed port.
1469  * @id: Event id for debug trace.
1470  * @ref: Reference for debug trace.
1471  */
1472 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1473 {
1474         zfcp_erp_modify_port_status(port, id, ref,
1475                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1476 }
1477
1478 /**
1479  * zfcp_erp_unit_failed - Set unit status to failed.
1480  * @unit: Failed unit.
1481  * @id: Event id for debug trace.
1482  * @ref: Reference for debug trace.
1483  */
1484 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1485 {
1486         zfcp_erp_modify_unit_status(unit, id, ref,
1487                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1488 }
1489
1490 /**
1491  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1492  * @adapter: adapter for which to wait for completion of its error recovery
1493  */
1494 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1495 {
1496         wait_event(adapter->erp_done_wqh,
1497                    !(atomic_read(&adapter->status) &
1498                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1499 }
1500
1501 /**
1502  * zfcp_erp_modify_adapter_status - change adapter status bits
1503  * @adapter: adapter to change the status
1504  * @id: id for the debug trace
1505  * @ref: reference for the debug trace
1506  * @mask: status bits to change
1507  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1508  *
1509  * Changes in common status bits are propagated to attached ports and units.
1510  */
1511 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1512                                     void *ref, u32 mask, int set_or_clear)
1513 {
1514         struct zfcp_port *port;
1515         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1516
1517         if (set_or_clear == ZFCP_SET) {
1518                 if (status_change_set(mask, &adapter->status))
1519                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1520                 atomic_set_mask(mask, &adapter->status);
1521         } else {
1522                 if (status_change_clear(mask, &adapter->status))
1523                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1524                 atomic_clear_mask(mask, &adapter->status);
1525                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1526                         atomic_set(&adapter->erp_counter, 0);
1527         }
1528
1529         if (common_mask)
1530                 list_for_each_entry(port, &adapter->port_list_head, list)
1531                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1532                                                     set_or_clear);
1533 }
1534
1535 /**
1536  * zfcp_erp_modify_port_status - change port status bits
1537  * @port: port to change the status bits
1538  * @id: id for the debug trace
1539  * @ref: reference for the debug trace
1540  * @mask: status bits to change
1541  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1542  *
1543  * Changes in common status bits are propagated to attached units.
1544  */
1545 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1546                                  u32 mask, int set_or_clear)
1547 {
1548         struct zfcp_unit *unit;
1549         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1550
1551         if (set_or_clear == ZFCP_SET) {
1552                 if (status_change_set(mask, &port->status))
1553                         zfcp_rec_dbf_event_port(id, ref, port);
1554                 atomic_set_mask(mask, &port->status);
1555         } else {
1556                 if (status_change_clear(mask, &port->status))
1557                         zfcp_rec_dbf_event_port(id, ref, port);
1558                 atomic_clear_mask(mask, &port->status);
1559                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1560                         atomic_set(&port->erp_counter, 0);
1561         }
1562
1563         if (common_mask)
1564                 list_for_each_entry(unit, &port->unit_list_head, list)
1565                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1566                                                     set_or_clear);
1567 }
1568
1569 /**
1570  * zfcp_erp_modify_unit_status - change unit status bits
1571  * @unit: unit to change the status bits
1572  * @id: id for the debug trace
1573  * @ref: reference for the debug trace
1574  * @mask: status bits to change
1575  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1576  */
1577 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1578                                  u32 mask, int set_or_clear)
1579 {
1580         if (set_or_clear == ZFCP_SET) {
1581                 if (status_change_set(mask, &unit->status))
1582                         zfcp_rec_dbf_event_unit(id, ref, unit);
1583                 atomic_set_mask(mask, &unit->status);
1584         } else {
1585                 if (status_change_clear(mask, &unit->status))
1586                         zfcp_rec_dbf_event_unit(id, ref, unit);
1587                 atomic_clear_mask(mask, &unit->status);
1588                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1589                         atomic_set(&unit->erp_counter, 0);
1590                 }
1591         }
1592 }
1593
1594 /**
1595  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1596  * @port: The "boxed" port.
1597  * @id: The debug trace id.
1598  * @id: Reference for the debug trace.
1599  */
1600 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1601 {
1602         unsigned long flags;
1603
1604         read_lock_irqsave(&zfcp_data.config_lock, flags);
1605         zfcp_erp_modify_port_status(port, id, ref,
1606                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1607         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1608         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1609 }
1610
1611 /**
1612  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1613  * @port: The "boxed" unit.
1614  * @id: The debug trace id.
1615  * @id: Reference for the debug trace.
1616  */
1617 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1618 {
1619         zfcp_erp_modify_unit_status(unit, id, ref,
1620                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1621         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1622 }
1623
1624 /**
1625  * zfcp_erp_port_access_denied - Adapter denied access to port.
1626  * @port: port where access has been denied
1627  * @id: id for debug trace
1628  * @ref: reference for debug trace
1629  *
1630  * Since the adapter has denied access, stop using the port and the
1631  * attached units.
1632  */
1633 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1634 {
1635         unsigned long flags;
1636
1637         read_lock_irqsave(&zfcp_data.config_lock, flags);
1638         zfcp_erp_modify_port_status(port, id, ref,
1639                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1640                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1641         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1642 }
1643
1644 /**
1645  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1646  * @unit: unit where access has been denied
1647  * @id: id for debug trace
1648  * @ref: reference for debug trace
1649  *
1650  * Since the adapter has denied access, stop using the unit.
1651  */
1652 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1653 {
1654         zfcp_erp_modify_unit_status(unit, id, ref,
1655                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1656                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1657 }
1658
1659 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1660                                          void *ref)
1661 {
1662         int status = atomic_read(&unit->status);
1663         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1664                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1665                 return;
1666
1667         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1668 }
1669
1670 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1671                                          void *ref)
1672 {
1673         struct zfcp_unit *unit;
1674         int status = atomic_read(&port->status);
1675
1676         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1677                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1678                 list_for_each_entry(unit, &port->unit_list_head, list)
1679                                     zfcp_erp_unit_access_changed(unit, id, ref);
1680                 return;
1681         }
1682
1683         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1684 }
1685
1686 /**
1687  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1688  * @adapter: Adapter where the Access Control Table (ACT) changed
1689  * @id: Id for debug trace
1690  * @ref: Reference for debug trace
1691  */
1692 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1693                                      void *ref)
1694 {
1695         struct zfcp_port *port;
1696         unsigned long flags;
1697
1698         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1699                 return;
1700
1701         read_lock_irqsave(&zfcp_data.config_lock, flags);
1702         list_for_each_entry(port, &adapter->port_list_head, list)
1703                 zfcp_erp_port_access_changed(port, id, ref);
1704         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1705 }