drivers/s390/scsi/zfcp_erp.c

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