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   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 <linux/kthread.h>
  13 #include "zfcp_ext.h"
  14
  15 #define ZFCP_MAX_ERPS                   3
  16
  17 enum zfcp_erp_act_flags {
  18         ZFCP_STATUS_ERP_TIMEDOUT        = 0x10000000,
  19         ZFCP_STATUS_ERP_CLOSE_ONLY      = 0x01000000,
  20         ZFCP_STATUS_ERP_DISMISSING      = 0x00100000,
  21         ZFCP_STATUS_ERP_DISMISSED       = 0x00200000,
  22         ZFCP_STATUS_ERP_LOWMEM          = 0x00400000,
  23 };
  24
  25 enum zfcp_erp_steps {
  26         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
  27         ZFCP_ERP_STEP_FSF_XCONFIG       = 0x0001,
  28         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
  29         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
  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_dbf_rec_action("erardy1", act);
  79         wake_up(&adapter->erp_ready_wq);
  80         zfcp_dbf_rec_thread("erardy2", adapter->dbf);
  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 (!adapter->erp_thread)
 217                 return -EIO;
 218
 219         need = zfcp_erp_required_act(want, adapter, port, unit);
 220         if (!need)
 221                 goto out;
 222
 223         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 224         act = zfcp_erp_setup_act(need, adapter, port, unit);
 225         if (!act)
 226                 goto out;
 227         ++adapter->erp_total_count;
 228         list_add_tail(&act->list, &adapter->erp_ready_head);
 229         wake_up(&adapter->erp_ready_wq);
 230         zfcp_dbf_rec_thread("eracte1", adapter->dbf);
 231         retval = 0;
 232  out:
 233         zfcp_dbf_rec_trigger(id, ref, want, need, act, adapter, port, unit);
 234         return retval;
 235 }
 236
 237 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 238                                     int clear_mask, char *id, void *ref)
 239 {
 240         zfcp_erp_adapter_block(adapter, clear_mask);
 241         zfcp_scsi_schedule_rports_block(adapter);
 242
 243         /* ensure propagation of failed status to new devices */
 244         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 245                 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
 246                 return -EIO;
 247         }
 248         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 249                                        adapter, NULL, NULL, id, ref);
 250 }
 251
 252 /**
 253  * zfcp_erp_adapter_reopen - Reopen adapter.
 254  * @adapter: Adapter to reopen.
 255  * @clear: Status flags to clear.
 256  * @id: Id for debug trace event.
 257  * @ref: Reference for debug trace event.
 258  */
 259 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
 260                              char *id, void *ref)
 261 {
 262         unsigned long flags;
 263
 264         read_lock_irqsave(&zfcp_data.config_lock, flags);
 265         write_lock(&adapter->erp_lock);
 266         _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
 267         write_unlock(&adapter->erp_lock);
 268         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 269 }
 270
 271 /**
 272  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 273  * @adapter: Adapter to shut down.
 274  * @clear: Status flags to clear.
 275  * @id: Id for debug trace event.
 276  * @ref: Reference for debug trace event.
 277  */
 278 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 279                                char *id, void *ref)
 280 {
 281         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 282         zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
 283 }
 284
 285 /**
 286  * zfcp_erp_port_shutdown - Shutdown port
 287  * @port: Port to shut down.
 288  * @clear: Status flags to clear.
 289  * @id: Id for debug trace event.
 290  * @ref: Reference for debug trace event.
 291  */
 292 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id,
 293                             void *ref)
 294 {
 295         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 296         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 297 }
 298
 299 /**
 300  * zfcp_erp_unit_shutdown - Shutdown unit
 301  * @unit: Unit to shut down.
 302  * @clear: Status flags to clear.
 303  * @id: Id for debug trace event.
 304  * @ref: Reference for debug trace event.
 305  */
 306 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
 307                             void *ref)
 308 {
 309         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 310         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 311 }
 312
 313 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 314 {
 315         zfcp_erp_modify_port_status(port, "erpblk1", NULL,
 316                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 317                                     ZFCP_CLEAR);
 318 }
 319
 320 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 321                                          int clear, char *id, void *ref)
 322 {
 323         zfcp_erp_port_block(port, clear);
 324         zfcp_scsi_schedule_rport_block(port);
 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         zfcp_scsi_schedule_rport_block(port);
 357
 358         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 359                 /* ensure propagation of failed status to new devices */
 360                 zfcp_erp_port_failed(port, "erpreo1", NULL);
 361                 return -EIO;
 362         }
 363
 364         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 365                                        port->adapter, port, NULL, id, ref);
 366 }
 367
 368 /**
 369  * zfcp_erp_port_reopen - trigger remote port recovery
 370  * @port: port to recover
 371  * @clear_mask: flags in port status to be cleared
 372  *
 373  * Returns 0 if recovery has been triggered, < 0 if not.
 374  */
 375 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
 376 {
 377         unsigned long flags;
 378         int retval;
 379         struct zfcp_adapter *adapter = port->adapter;
 380
 381         read_lock_irqsave(&zfcp_data.config_lock, flags);
 382         write_lock(&adapter->erp_lock);
 383         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 384         write_unlock(&adapter->erp_lock);
 385         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 386
 387         return retval;
 388 }
 389
 390 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 391 {
 392         zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
 393                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 394                                     ZFCP_CLEAR);
 395 }
 396
 397 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 398                                   void *ref)
 399 {
 400         struct zfcp_adapter *adapter = unit->port->adapter;
 401
 402         zfcp_erp_unit_block(unit, clear);
 403
 404         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 405                 return;
 406
 407         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 408                                 adapter, unit->port, unit, id, ref);
 409 }
 410
 411 /**
 412  * zfcp_erp_unit_reopen - initiate reopen of a unit
 413  * @unit: unit to be reopened
 414  * @clear_mask: specifies flags in unit status to be cleared
 415  * Return: 0 on success, < 0 on error
 416  */
 417 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 418                           void *ref)
 419 {
 420         unsigned long flags;
 421         struct zfcp_port *port = unit->port;
 422         struct zfcp_adapter *adapter = port->adapter;
 423
 424         read_lock_irqsave(&zfcp_data.config_lock, flags);
 425         write_lock(&adapter->erp_lock);
 426         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 427         write_unlock(&adapter->erp_lock);
 428         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 429 }
 430
 431 static int status_change_set(unsigned long mask, atomic_t *status)
 432 {
 433         return (atomic_read(status) ^ mask) & mask;
 434 }
 435
 436 static int status_change_clear(unsigned long mask, atomic_t *status)
 437 {
 438         return atomic_read(status) & mask;
 439 }
 440
 441 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 442 {
 443         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 444                 zfcp_dbf_rec_adapter("eraubl1", NULL, adapter->dbf);
 445         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 446 }
 447
 448 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 449 {
 450         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 451                 zfcp_dbf_rec_port("erpubl1", NULL, port);
 452         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 453 }
 454
 455 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 456 {
 457         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 458                 zfcp_dbf_rec_unit("eruubl1", NULL, unit);
 459         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 460 }
 461
 462 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 463 {
 464         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 465         zfcp_dbf_rec_action("erator1", erp_action);
 466 }
 467
 468 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 469 {
 470         struct zfcp_adapter *adapter = act->adapter;
 471
 472         if (!act->fsf_req)
 473                 return;
 474
 475         spin_lock(&adapter->req_list_lock);
 476         if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
 477             act->fsf_req->erp_action == act) {
 478                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 479                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 480                         act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 481                         zfcp_dbf_rec_action("erscf_1", act);
 482                         act->fsf_req->erp_action = NULL;
 483                 }
 484                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 485                         zfcp_dbf_rec_action("erscf_2", act);
 486                 if (act->fsf_req->status & 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_failed(struct zfcp_erp_action *act)
 554 {
 555         switch (act->action) {
 556         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 557                 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1", NULL);
 558                 break;
 559         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 560                 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2", NULL);
 561                 break;
 562         case ZFCP_ERP_ACTION_REOPEN_PORT:
 563                 _zfcp_erp_port_reopen(act->port, 0, "ersff_3", NULL);
 564                 break;
 565         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 566                 _zfcp_erp_unit_reopen(act->unit, 0, "ersff_4", NULL);
 567                 break;
 568         }
 569 }
 570
 571 static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
 572 {
 573         switch (act->action) {
 574         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 575                 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1", NULL);
 576                 break;
 577         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 578                 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2", NULL);
 579                 break;
 580         case ZFCP_ERP_ACTION_REOPEN_PORT:
 581                 _zfcp_erp_unit_reopen_all(act->port, 0, "ersfs_3", NULL);
 582                 break;
 583         }
 584 }
 585
 586 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 587 {
 588         unsigned long flags;
 589
 590         read_lock_irqsave(&zfcp_data.config_lock, flags);
 591         read_lock(&adapter->erp_lock);
 592         if (list_empty(&adapter->erp_ready_head) &&
 593             list_empty(&adapter->erp_running_head)) {
 594                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 595                                           &adapter->status);
 596                         wake_up(&adapter->erp_done_wqh);
 597         }
 598         read_unlock(&adapter->erp_lock);
 599         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 600 }
 601
 602 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 603 {
 604         struct zfcp_qdio *qdio = act->adapter->qdio;
 605
 606         if (zfcp_qdio_open(qdio))
 607                 return ZFCP_ERP_FAILED;
 608         init_waitqueue_head(&qdio->req_q_wq);
 609         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 610         return ZFCP_ERP_SUCCEEDED;
 611 }
 612
 613 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 614 {
 615         struct zfcp_port *port;
 616         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 617                                  adapter->peer_d_id);
 618         if (IS_ERR(port)) /* error or port already attached */
 619                 return;
 620         _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
 621 }
 622
 623 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 624 {
 625         int retries;
 626         int sleep = 1;
 627         struct zfcp_adapter *adapter = erp_action->adapter;
 628
 629         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 630
 631         for (retries = 7; retries; retries--) {
 632                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 633                                   &adapter->status);
 634                 write_lock_irq(&adapter->erp_lock);
 635                 zfcp_erp_action_to_running(erp_action);
 636                 write_unlock_irq(&adapter->erp_lock);
 637                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 638                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 639                                           &adapter->status);
 640                         return ZFCP_ERP_FAILED;
 641                 }
 642
 643                 zfcp_dbf_rec_thread_lock("erasfx1", adapter->dbf);
 644                 wait_event(adapter->erp_ready_wq,
 645                            !list_empty(&adapter->erp_ready_head));
 646                 zfcp_dbf_rec_thread_lock("erasfx2", adapter->dbf);
 647                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 648                         break;
 649
 650                 if (!(atomic_read(&adapter->status) &
 651                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 652                         break;
 653
 654                 ssleep(sleep);
 655                 sleep *= 2;
 656         }
 657
 658         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 659                           &adapter->status);
 660
 661         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 662                 return ZFCP_ERP_FAILED;
 663
 664         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 665                 zfcp_erp_enqueue_ptp_port(adapter);
 666
 667         return ZFCP_ERP_SUCCEEDED;
 668 }
 669
 670 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 671 {
 672         int ret;
 673         struct zfcp_adapter *adapter = act->adapter;
 674
 675         write_lock_irq(&adapter->erp_lock);
 676         zfcp_erp_action_to_running(act);
 677         write_unlock_irq(&adapter->erp_lock);
 678
 679         ret = zfcp_fsf_exchange_port_data(act);
 680         if (ret == -EOPNOTSUPP)
 681                 return ZFCP_ERP_SUCCEEDED;
 682         if (ret)
 683                 return ZFCP_ERP_FAILED;
 684
 685         zfcp_dbf_rec_thread_lock("erasox1", adapter->dbf);
 686         wait_event(adapter->erp_ready_wq,
 687                    !list_empty(&adapter->erp_ready_head));
 688         zfcp_dbf_rec_thread_lock("erasox2", adapter->dbf);
 689         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 690                 return ZFCP_ERP_FAILED;
 691
 692         return ZFCP_ERP_SUCCEEDED;
 693 }
 694
 695 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 696 {
 697         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 698                 return ZFCP_ERP_FAILED;
 699
 700         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 701                 return ZFCP_ERP_FAILED;
 702
 703         atomic_set(&act->adapter->stat_miss, 16);
 704         if (zfcp_status_read_refill(act->adapter))
 705                 return ZFCP_ERP_FAILED;
 706
 707         return ZFCP_ERP_SUCCEEDED;
 708 }
 709
 710 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 711 {
 712         struct zfcp_adapter *adapter = act->adapter;
 713
 714         /* close queues to ensure that buffers are not accessed by adapter */
 715         zfcp_qdio_close(adapter->qdio);
 716         zfcp_fsf_req_dismiss_all(adapter);
 717         adapter->fsf_req_seq_no = 0;
 718         zfcp_fc_wka_ports_force_offline(adapter->gs);
 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 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 846 {
 847         struct zfcp_adapter *adapter = act->adapter;
 848         struct zfcp_port *port = act->port;
 849         int p_status = atomic_read(&port->status);
 850
 851         switch (act->step) {
 852         case ZFCP_ERP_STEP_UNINITIALIZED:
 853         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 854         case ZFCP_ERP_STEP_PORT_CLOSING:
 855                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 856                         return zfcp_erp_open_ptp_port(act);
 857                 if (!port->d_id) {
 858                         zfcp_port_get(port);
 859                         if (!queue_work(adapter->work_queue,
 860                                         &port->gid_pn_work))
 861                                 zfcp_port_put(port);
 862                         return ZFCP_ERP_EXIT;
 863                 }
 864                 return zfcp_erp_port_strategy_open_port(act);
 865
 866         case ZFCP_ERP_STEP_PORT_OPENING:
 867                 /* D_ID might have changed during open */
 868                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 869                         if (port->d_id)
 870                                 return ZFCP_ERP_SUCCEEDED;
 871                         else {
 872                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 873                                 return ZFCP_ERP_CONTINUES;
 874                         }
 875                 }
 876                 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
 877                         port->d_id = 0;
 878                         _zfcp_erp_port_reopen(port, 0, "erpsoc1", NULL);
 879                         return ZFCP_ERP_EXIT;
 880                 }
 881                 /* fall through otherwise */
 882         }
 883         return ZFCP_ERP_FAILED;
 884 }
 885
 886 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 887 {
 888         struct zfcp_port *port = erp_action->port;
 889
 890         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 891                 goto close_init_done;
 892
 893         switch (erp_action->step) {
 894         case ZFCP_ERP_STEP_UNINITIALIZED:
 895                 zfcp_erp_port_strategy_clearstati(port);
 896                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 897                         return zfcp_erp_port_strategy_close(erp_action);
 898                 break;
 899
 900         case ZFCP_ERP_STEP_PORT_CLOSING:
 901                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 902                         return ZFCP_ERP_FAILED;
 903                 break;
 904         }
 905
 906 close_init_done:
 907         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 908                 return ZFCP_ERP_EXIT;
 909
 910         return zfcp_erp_port_strategy_open_common(erp_action);
 911 }
 912
 913 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 914 {
 915         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 916                           ZFCP_STATUS_UNIT_SHARED |
 917                           ZFCP_STATUS_UNIT_READONLY,
 918                           &unit->status);
 919 }
 920
 921 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 922 {
 923         int retval = zfcp_fsf_close_unit(erp_action);
 924         if (retval == -ENOMEM)
 925                 return ZFCP_ERP_NOMEM;
 926         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 927         if (retval)
 928                 return ZFCP_ERP_FAILED;
 929         return ZFCP_ERP_CONTINUES;
 930 }
 931
 932 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 933 {
 934         int retval = zfcp_fsf_open_unit(erp_action);
 935         if (retval == -ENOMEM)
 936                 return ZFCP_ERP_NOMEM;
 937         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 938         if (retval)
 939                 return  ZFCP_ERP_FAILED;
 940         return ZFCP_ERP_CONTINUES;
 941 }
 942
 943 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 944 {
 945         struct zfcp_unit *unit = erp_action->unit;
 946
 947         switch (erp_action->step) {
 948         case ZFCP_ERP_STEP_UNINITIALIZED:
 949                 zfcp_erp_unit_strategy_clearstati(unit);
 950                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 951                         return zfcp_erp_unit_strategy_close(erp_action);
 952                 /* already closed, fall through */
 953         case ZFCP_ERP_STEP_UNIT_CLOSING:
 954                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 955                         return ZFCP_ERP_FAILED;
 956                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 957                         return ZFCP_ERP_EXIT;
 958                 return zfcp_erp_unit_strategy_open(erp_action);
 959
 960         case ZFCP_ERP_STEP_UNIT_OPENING:
 961                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 962                         return ZFCP_ERP_SUCCEEDED;
 963         }
 964         return ZFCP_ERP_FAILED;
 965 }
 966
 967 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 968 {
 969         switch (result) {
 970         case ZFCP_ERP_SUCCEEDED :
 971                 atomic_set(&unit->erp_counter, 0);
 972                 zfcp_erp_unit_unblock(unit);
 973                 break;
 974         case ZFCP_ERP_FAILED :
 975                 atomic_inc(&unit->erp_counter);
 976                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
 977                         dev_err(&unit->port->adapter->ccw_device->dev,
 978                                 "ERP failed for unit 0x%016Lx on "
 979                                 "port 0x%016Lx\n",
 980                                 (unsigned long long)unit->fcp_lun,
 981                                 (unsigned long long)unit->port->wwpn);
 982                         zfcp_erp_unit_failed(unit, "erusck1", NULL);
 983                 }
 984                 break;
 985         }
 986
 987         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 988                 zfcp_erp_unit_block(unit, 0);
 989                 result = ZFCP_ERP_EXIT;
 990         }
 991         return result;
 992 }
 993
 994 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
 995 {
 996         switch (result) {
 997         case ZFCP_ERP_SUCCEEDED :
 998                 atomic_set(&port->erp_counter, 0);
 999                 zfcp_erp_port_unblock(port);
1000                 break;
1001
1002         case ZFCP_ERP_FAILED :
1003                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1004                         zfcp_erp_port_block(port, 0);
1005                         result = ZFCP_ERP_EXIT;
1006                 }
1007                 atomic_inc(&port->erp_counter);
1008                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1009                         dev_err(&port->adapter->ccw_device->dev,
1010                                 "ERP failed for remote port 0x%016Lx\n",
1011                                 (unsigned long long)port->wwpn);
1012                         zfcp_erp_port_failed(port, "erpsck1", NULL);
1013                 }
1014                 break;
1015         }
1016
1017         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1018                 zfcp_erp_port_block(port, 0);
1019                 result = ZFCP_ERP_EXIT;
1020         }
1021         return result;
1022 }
1023
1024 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1025                                            int result)
1026 {
1027         switch (result) {
1028         case ZFCP_ERP_SUCCEEDED :
1029                 atomic_set(&adapter->erp_counter, 0);
1030                 zfcp_erp_adapter_unblock(adapter);
1031                 break;
1032
1033         case ZFCP_ERP_FAILED :
1034                 atomic_inc(&adapter->erp_counter);
1035                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1036                         dev_err(&adapter->ccw_device->dev,
1037                                 "ERP cannot recover an error "
1038                                 "on the FCP device\n");
1039                         zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1040                 }
1041                 break;
1042         }
1043
1044         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1045                 zfcp_erp_adapter_block(adapter, 0);
1046                 result = ZFCP_ERP_EXIT;
1047         }
1048         return result;
1049 }
1050
1051 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1052                                           int result)
1053 {
1054         struct zfcp_adapter *adapter = erp_action->adapter;
1055         struct zfcp_port *port = erp_action->port;
1056         struct zfcp_unit *unit = erp_action->unit;
1057
1058         switch (erp_action->action) {
1059
1060         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1061                 result = zfcp_erp_strategy_check_unit(unit, result);
1062                 break;
1063
1064         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1065         case ZFCP_ERP_ACTION_REOPEN_PORT:
1066                 result = zfcp_erp_strategy_check_port(port, result);
1067                 break;
1068
1069         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1070                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1071                 break;
1072         }
1073         return result;
1074 }
1075
1076 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1077 {
1078         int status = atomic_read(target_status);
1079
1080         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1081             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1082                 return 1; /* take it online */
1083
1084         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1085             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1086                 return 1; /* take it offline */
1087
1088         return 0;
1089 }
1090
1091 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1092 {
1093         int action = act->action;
1094         struct zfcp_adapter *adapter = act->adapter;
1095         struct zfcp_port *port = act->port;
1096         struct zfcp_unit *unit = act->unit;
1097         u32 erp_status = act->status;
1098
1099         switch (action) {
1100         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1101                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1102                         _zfcp_erp_adapter_reopen(adapter,
1103                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1104                                                  "ersscg1", NULL);
1105                         return ZFCP_ERP_EXIT;
1106                 }
1107                 break;
1108
1109         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1110         case ZFCP_ERP_ACTION_REOPEN_PORT:
1111                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1112                         _zfcp_erp_port_reopen(port,
1113                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1114                                               "ersscg2", NULL);
1115                         return ZFCP_ERP_EXIT;
1116                 }
1117                 break;
1118
1119         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1120                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1121                         _zfcp_erp_unit_reopen(unit,
1122                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1123                                               "ersscg3", NULL);
1124                         return ZFCP_ERP_EXIT;
1125                 }
1126                 break;
1127         }
1128         return ret;
1129 }
1130
1131 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1132 {
1133         struct zfcp_adapter *adapter = erp_action->adapter;
1134
1135         adapter->erp_total_count--;
1136         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1137                 adapter->erp_low_mem_count--;
1138                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1139         }
1140
1141         list_del(&erp_action->list);
1142         zfcp_dbf_rec_action("eractd1", erp_action);
1143
1144         switch (erp_action->action) {
1145         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1146                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1147                                   &erp_action->unit->status);
1148                 break;
1149
1150         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1151         case ZFCP_ERP_ACTION_REOPEN_PORT:
1152                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1153                                   &erp_action->port->status);
1154                 break;
1155
1156         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1157                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1158                                   &erp_action->adapter->status);
1159                 break;
1160         }
1161 }
1162
1163 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1164 {
1165         struct zfcp_adapter *adapter = act->adapter;
1166         struct zfcp_port *port = act->port;
1167         struct zfcp_unit *unit = act->unit;
1168
1169         switch (act->action) {
1170         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1171                 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1172                         zfcp_unit_get(unit);
1173                         if (scsi_queue_work(unit->port->adapter->scsi_host,
1174                                             &unit->scsi_work) <= 0)
1175                                 zfcp_unit_put(unit);
1176                 }
1177                 zfcp_unit_put(unit);
1178                 break;
1179
1180         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1181         case ZFCP_ERP_ACTION_REOPEN_PORT:
1182                 if (result == ZFCP_ERP_SUCCEEDED)
1183                         zfcp_scsi_schedule_rport_register(port);
1184                 zfcp_port_put(port);
1185                 break;
1186
1187         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1188                 if (result == ZFCP_ERP_SUCCEEDED) {
1189                         register_service_level(&adapter->service_level);
1190                         schedule_work(&adapter->scan_work);
1191                 } else
1192                         unregister_service_level(&adapter->service_level);
1193                 zfcp_adapter_put(adapter);
1194                 break;
1195         }
1196 }
1197
1198 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1199 {
1200         switch (erp_action->action) {
1201         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1202                 return zfcp_erp_adapter_strategy(erp_action);
1203         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1204                 return zfcp_erp_port_forced_strategy(erp_action);
1205         case ZFCP_ERP_ACTION_REOPEN_PORT:
1206                 return zfcp_erp_port_strategy(erp_action);
1207         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1208                 return zfcp_erp_unit_strategy(erp_action);
1209         }
1210         return ZFCP_ERP_FAILED;
1211 }
1212
1213 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1214 {
1215         int retval;
1216         struct zfcp_adapter *adapter = erp_action->adapter;
1217         unsigned long flags;
1218
1219         read_lock_irqsave(&zfcp_data.config_lock, flags);
1220         write_lock(&adapter->erp_lock);
1221
1222         zfcp_erp_strategy_check_fsfreq(erp_action);
1223
1224         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1225                 zfcp_erp_action_dequeue(erp_action);
1226                 retval = ZFCP_ERP_DISMISSED;
1227                 goto unlock;
1228         }
1229
1230         zfcp_erp_action_to_running(erp_action);
1231
1232         /* no lock to allow for blocking operations */
1233         write_unlock(&adapter->erp_lock);
1234         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1235         retval = zfcp_erp_strategy_do_action(erp_action);
1236         read_lock_irqsave(&zfcp_data.config_lock, flags);
1237         write_lock(&adapter->erp_lock);
1238
1239         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1240                 retval = ZFCP_ERP_CONTINUES;
1241
1242         switch (retval) {
1243         case ZFCP_ERP_NOMEM:
1244                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1245                         ++adapter->erp_low_mem_count;
1246                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1247                 }
1248                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1249                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1250                 else {
1251                         zfcp_erp_strategy_memwait(erp_action);
1252                         retval = ZFCP_ERP_CONTINUES;
1253                 }
1254                 goto unlock;
1255
1256         case ZFCP_ERP_CONTINUES:
1257                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1258                         --adapter->erp_low_mem_count;
1259                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1260                 }
1261                 goto unlock;
1262         }
1263
1264         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1265         zfcp_erp_action_dequeue(erp_action);
1266         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1267         if (retval == ZFCP_ERP_EXIT)
1268                 goto unlock;
1269         if (retval == ZFCP_ERP_SUCCEEDED)
1270                 zfcp_erp_strategy_followup_success(erp_action);
1271         if (retval == ZFCP_ERP_FAILED)
1272                 zfcp_erp_strategy_followup_failed(erp_action);
1273
1274  unlock:
1275         write_unlock(&adapter->erp_lock);
1276         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1277
1278         if (retval != ZFCP_ERP_CONTINUES)
1279                 zfcp_erp_action_cleanup(erp_action, retval);
1280
1281         return retval;
1282 }
1283
1284 static int zfcp_erp_thread(void *data)
1285 {
1286         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1287         struct list_head *next;
1288         struct zfcp_erp_action *act;
1289         unsigned long flags;
1290
1291         for (;;) {
1292                 zfcp_dbf_rec_thread_lock("erthrd1", adapter->dbf);
1293                 wait_event_interruptible(adapter->erp_ready_wq,
1294                            !list_empty(&adapter->erp_ready_head) ||
1295                            kthread_should_stop());
1296                 zfcp_dbf_rec_thread_lock("erthrd2", adapter->dbf);
1297
1298                 if (kthread_should_stop())
1299                         break;
1300
1301                 write_lock_irqsave(&adapter->erp_lock, flags);
1302                 next = adapter->erp_ready_head.next;
1303                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1304
1305                 if (next != &adapter->erp_ready_head) {
1306                         act = list_entry(next, struct zfcp_erp_action, list);
1307
1308                         /* there is more to come after dismission, no notify */
1309                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1310                                 zfcp_erp_wakeup(adapter);
1311                 }
1312         }
1313
1314         return 0;
1315 }
1316
1317 /**
1318  * zfcp_erp_thread_setup - Start ERP thread for adapter
1319  * @adapter: Adapter to start the ERP thread for
1320  *
1321  * Returns 0 on success or error code from kernel_thread()
1322  */
1323 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1324 {
1325         struct task_struct *thread;
1326
1327         thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
1328                              dev_name(&adapter->ccw_device->dev));
1329         if (IS_ERR(thread)) {
1330                 dev_err(&adapter->ccw_device->dev,
1331                         "Creating an ERP thread for the FCP device failed.\n");
1332                 return PTR_ERR(thread);
1333         }
1334
1335         adapter->erp_thread = thread;
1336         return 0;
1337 }
1338
1339 /**
1340  * zfcp_erp_thread_kill - Stop ERP thread.
1341  * @adapter: Adapter where the ERP thread should be stopped.
1342  *
1343  * The caller of this routine ensures that the specified adapter has
1344  * been shut down and that this operation has been completed. Thus,
1345  * there are no pending erp_actions which would need to be handled
1346  * here.
1347  */
1348 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1349 {
1350         kthread_stop(adapter->erp_thread);
1351         adapter->erp_thread = NULL;
1352 }
1353
1354 /**
1355  * zfcp_erp_adapter_failed - Set adapter status to failed.
1356  * @adapter: Failed adapter.
1357  * @id: Event id for debug trace.
1358  * @ref: Reference for debug trace.
1359  */
1360 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1361 {
1362         zfcp_erp_modify_adapter_status(adapter, id, ref,
1363                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1364 }
1365
1366 /**
1367  * zfcp_erp_port_failed - Set port status to failed.
1368  * @port: Failed port.
1369  * @id: Event id for debug trace.
1370  * @ref: Reference for debug trace.
1371  */
1372 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1373 {
1374         zfcp_erp_modify_port_status(port, id, ref,
1375                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1376 }
1377
1378 /**
1379  * zfcp_erp_unit_failed - Set unit status to failed.
1380  * @unit: Failed unit.
1381  * @id: Event id for debug trace.
1382  * @ref: Reference for debug trace.
1383  */
1384 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1385 {
1386         zfcp_erp_modify_unit_status(unit, id, ref,
1387                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1388 }
1389
1390 /**
1391  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1392  * @adapter: adapter for which to wait for completion of its error recovery
1393  */
1394 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1395 {
1396         wait_event(adapter->erp_done_wqh,
1397                    !(atomic_read(&adapter->status) &
1398                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1399 }
1400
1401 /**
1402  * zfcp_erp_modify_adapter_status - change adapter status bits
1403  * @adapter: adapter to change the status
1404  * @id: id for the debug trace
1405  * @ref: reference for the debug trace
1406  * @mask: status bits to change
1407  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1408  *
1409  * Changes in common status bits are propagated to attached ports and units.
1410  */
1411 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1412                                     void *ref, u32 mask, int set_or_clear)
1413 {
1414         struct zfcp_port *port;
1415         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1416
1417         if (set_or_clear == ZFCP_SET) {
1418                 if (status_change_set(mask, &adapter->status))
1419                         zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1420                 atomic_set_mask(mask, &adapter->status);
1421         } else {
1422                 if (status_change_clear(mask, &adapter->status))
1423                         zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1424                 atomic_clear_mask(mask, &adapter->status);
1425                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1426                         atomic_set(&adapter->erp_counter, 0);
1427         }
1428
1429         if (common_mask)
1430                 list_for_each_entry(port, &adapter->port_list_head, list)
1431                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1432                                                     set_or_clear);
1433 }
1434
1435 /**
1436  * zfcp_erp_modify_port_status - change port status bits
1437  * @port: port to change the status bits
1438  * @id: id for the debug trace
1439  * @ref: reference for the debug trace
1440  * @mask: status bits to change
1441  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1442  *
1443  * Changes in common status bits are propagated to attached units.
1444  */
1445 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1446                                  u32 mask, int set_or_clear)
1447 {
1448         struct zfcp_unit *unit;
1449         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1450
1451         if (set_or_clear == ZFCP_SET) {
1452                 if (status_change_set(mask, &port->status))
1453                         zfcp_dbf_rec_port(id, ref, port);
1454                 atomic_set_mask(mask, &port->status);
1455         } else {
1456                 if (status_change_clear(mask, &port->status))
1457                         zfcp_dbf_rec_port(id, ref, port);
1458                 atomic_clear_mask(mask, &port->status);
1459                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1460                         atomic_set(&port->erp_counter, 0);
1461         }
1462
1463         if (common_mask)
1464                 list_for_each_entry(unit, &port->unit_list_head, list)
1465                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1466                                                     set_or_clear);
1467 }
1468
1469 /**
1470  * zfcp_erp_modify_unit_status - change unit status bits
1471  * @unit: unit to change the status bits
1472  * @id: id for the debug trace
1473  * @ref: reference for the debug trace
1474  * @mask: status bits to change
1475  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1476  */
1477 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1478                                  u32 mask, int set_or_clear)
1479 {
1480         if (set_or_clear == ZFCP_SET) {
1481                 if (status_change_set(mask, &unit->status))
1482                         zfcp_dbf_rec_unit(id, ref, unit);
1483                 atomic_set_mask(mask, &unit->status);
1484         } else {
1485                 if (status_change_clear(mask, &unit->status))
1486                         zfcp_dbf_rec_unit(id, ref, unit);
1487                 atomic_clear_mask(mask, &unit->status);
1488                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1489                         atomic_set(&unit->erp_counter, 0);
1490                 }
1491         }
1492 }
1493
1494 /**
1495  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1496  * @port: The "boxed" port.
1497  * @id: The debug trace id.
1498  * @id: Reference for the debug trace.
1499  */
1500 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1501 {
1502         unsigned long flags;
1503
1504         read_lock_irqsave(&zfcp_data.config_lock, flags);
1505         zfcp_erp_modify_port_status(port, id, ref,
1506                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1507         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1508         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1509 }
1510
1511 /**
1512  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1513  * @port: The "boxed" unit.
1514  * @id: The debug trace id.
1515  * @id: Reference for the debug trace.
1516  */
1517 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1518 {
1519         zfcp_erp_modify_unit_status(unit, id, ref,
1520                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1521         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1522 }
1523
1524 /**
1525  * zfcp_erp_port_access_denied - Adapter denied access to port.
1526  * @port: port where access has been denied
1527  * @id: id for debug trace
1528  * @ref: reference for debug trace
1529  *
1530  * Since the adapter has denied access, stop using the port and the
1531  * attached units.
1532  */
1533 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1534 {
1535         unsigned long flags;
1536
1537         read_lock_irqsave(&zfcp_data.config_lock, flags);
1538         zfcp_erp_modify_port_status(port, id, ref,
1539                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1540                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1541         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1542 }
1543
1544 /**
1545  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1546  * @unit: unit where access has been denied
1547  * @id: id for debug trace
1548  * @ref: reference for debug trace
1549  *
1550  * Since the adapter has denied access, stop using the unit.
1551  */
1552 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1553 {
1554         zfcp_erp_modify_unit_status(unit, id, ref,
1555                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1556                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1557 }
1558
1559 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1560                                          void *ref)
1561 {
1562         int status = atomic_read(&unit->status);
1563         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1564                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1565                 return;
1566
1567         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1568 }
1569
1570 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1571                                          void *ref)
1572 {
1573         struct zfcp_unit *unit;
1574         int status = atomic_read(&port->status);
1575
1576         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1577                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1578                 list_for_each_entry(unit, &port->unit_list_head, list)
1579                                     zfcp_erp_unit_access_changed(unit, id, ref);
1580                 return;
1581         }
1582
1583         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1584 }
1585
1586 /**
1587  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1588  * @adapter: Adapter where the Access Control Table (ACT) changed
1589  * @id: Id for debug trace
1590  * @ref: Reference for debug trace
1591  */
1592 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1593                                      void *ref)
1594 {
1595         struct zfcp_port *port;
1596         unsigned long flags;
1597
1598         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1599                 return;
1600
1601         read_lock_irqsave(&zfcp_data.config_lock, flags);
1602         list_for_each_entry(port, &adapter->port_list_head, list)
1603                 zfcp_erp_port_access_changed(port, id, ref);
1604         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1605 }