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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 "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         /* all ports and units are closed */
 723         zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
 724                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 725
 726         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 727                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 728 }
 729
 730 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
 731 {
 732         struct zfcp_adapter *adapter = act->adapter;
 733
 734         if (zfcp_erp_adapter_strategy_open_qdio(act)) {
 735                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 736                                   ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 737                                   &adapter->status);
 738                 return ZFCP_ERP_FAILED;
 739         }
 740
 741         if (zfcp_erp_adapter_strategy_open_fsf(act)) {
 742                 zfcp_erp_adapter_strategy_close(act);
 743                 return ZFCP_ERP_FAILED;
 744         }
 745
 746         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
 747
 748         return ZFCP_ERP_SUCCEEDED;
 749 }
 750
 751 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 752 {
 753         struct zfcp_adapter *adapter = act->adapter;
 754
 755         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
 756                 zfcp_erp_adapter_strategy_close(act);
 757                 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 758                         return ZFCP_ERP_EXIT;
 759         }
 760
 761         if (zfcp_erp_adapter_strategy_open(act)) {
 762                 ssleep(8);
 763                 return ZFCP_ERP_FAILED;
 764         }
 765
 766         return ZFCP_ERP_SUCCEEDED;
 767 }
 768
 769 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 770 {
 771         int retval;
 772
 773         retval = zfcp_fsf_close_physical_port(act);
 774         if (retval == -ENOMEM)
 775                 return ZFCP_ERP_NOMEM;
 776         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 777         if (retval)
 778                 return ZFCP_ERP_FAILED;
 779
 780         return ZFCP_ERP_CONTINUES;
 781 }
 782
 783 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 784 {
 785         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
 786 }
 787
 788 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 789 {
 790         struct zfcp_port *port = erp_action->port;
 791         int status = atomic_read(&port->status);
 792
 793         switch (erp_action->step) {
 794         case ZFCP_ERP_STEP_UNINITIALIZED:
 795                 zfcp_erp_port_strategy_clearstati(port);
 796                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 797                     (status & ZFCP_STATUS_COMMON_OPEN))
 798                         return zfcp_erp_port_forced_strategy_close(erp_action);
 799                 else
 800                         return ZFCP_ERP_FAILED;
 801
 802         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 803                 if (status & ZFCP_STATUS_PORT_PHYS_OPEN)
 804                         return ZFCP_ERP_SUCCEEDED;
 805         }
 806         return ZFCP_ERP_FAILED;
 807 }
 808
 809 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 810 {
 811         int retval;
 812
 813         retval = zfcp_fsf_close_port(erp_action);
 814         if (retval == -ENOMEM)
 815                 return ZFCP_ERP_NOMEM;
 816         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 817         if (retval)
 818                 return ZFCP_ERP_FAILED;
 819         return ZFCP_ERP_CONTINUES;
 820 }
 821
 822 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 823 {
 824         int retval;
 825
 826         retval = zfcp_fsf_open_port(erp_action);
 827         if (retval == -ENOMEM)
 828                 return ZFCP_ERP_NOMEM;
 829         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 830         if (retval)
 831                 return ZFCP_ERP_FAILED;
 832         return ZFCP_ERP_CONTINUES;
 833 }
 834
 835 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 836 {
 837         struct zfcp_adapter *adapter = act->adapter;
 838         struct zfcp_port *port = act->port;
 839
 840         if (port->wwpn != adapter->peer_wwpn) {
 841                 zfcp_erp_port_failed(port, "eroptp1", NULL);
 842                 return ZFCP_ERP_FAILED;
 843         }
 844         port->d_id = adapter->peer_d_id;
 845         return zfcp_erp_port_strategy_open_port(act);
 846 }
 847
 848 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
 849 {
 850         int retval;
 851         struct zfcp_port *port = container_of(work, struct zfcp_port,
 852                                               gid_pn_work);
 853
 854         retval = zfcp_fc_ns_gid_pn(&port->erp_action);
 855         if (retval == -ENOMEM)
 856                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_NOMEM);
 857         port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
 858         if (retval)
 859                 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_FAILED);
 860         zfcp_port_put(port);
 861 }
 862
 863 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 864 {
 865         struct zfcp_adapter *adapter = act->adapter;
 866         struct zfcp_port *port = act->port;
 867         int p_status = atomic_read(&port->status);
 868
 869         switch (act->step) {
 870         case ZFCP_ERP_STEP_UNINITIALIZED:
 871         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 872         case ZFCP_ERP_STEP_PORT_CLOSING:
 873                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 874                         return zfcp_erp_open_ptp_port(act);
 875                 if (!port->d_id) {
 876                         zfcp_port_get(port);
 877                         if (!queue_work(zfcp_data.work_queue,
 878                                         &port->gid_pn_work))
 879                                 zfcp_port_put(port);
 880                         return ZFCP_ERP_CONTINUES;
 881                 }
 882         case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
 883                 if (!port->d_id)
 884                         return ZFCP_ERP_FAILED;
 885                 return zfcp_erp_port_strategy_open_port(act);
 886
 887         case ZFCP_ERP_STEP_PORT_OPENING:
 888                 /* D_ID might have changed during open */
 889                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 890                         if (port->d_id)
 891                                 return ZFCP_ERP_SUCCEEDED;
 892                         else {
 893                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 894                                 return ZFCP_ERP_CONTINUES;
 895                         }
 896                 /* fall through otherwise */
 897                 }
 898         }
 899         return ZFCP_ERP_FAILED;
 900 }
 901
 902 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 903 {
 904         struct zfcp_port *port = erp_action->port;
 905
 906         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 907                 goto close_init_done;
 908
 909         switch (erp_action->step) {
 910         case ZFCP_ERP_STEP_UNINITIALIZED:
 911                 zfcp_erp_port_strategy_clearstati(port);
 912                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 913                         return zfcp_erp_port_strategy_close(erp_action);
 914                 break;
 915
 916         case ZFCP_ERP_STEP_PORT_CLOSING:
 917                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 918                         return ZFCP_ERP_FAILED;
 919                 break;
 920         }
 921
 922 close_init_done:
 923         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 924                 return ZFCP_ERP_EXIT;
 925
 926         return zfcp_erp_port_strategy_open_common(erp_action);
 927 }
 928
 929 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 930 {
 931         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 932                           ZFCP_STATUS_UNIT_SHARED |
 933                           ZFCP_STATUS_UNIT_READONLY,
 934                           &unit->status);
 935 }
 936
 937 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 938 {
 939         int retval = zfcp_fsf_close_unit(erp_action);
 940         if (retval == -ENOMEM)
 941                 return ZFCP_ERP_NOMEM;
 942         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 943         if (retval)
 944                 return ZFCP_ERP_FAILED;
 945         return ZFCP_ERP_CONTINUES;
 946 }
 947
 948 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 949 {
 950         int retval = zfcp_fsf_open_unit(erp_action);
 951         if (retval == -ENOMEM)
 952                 return ZFCP_ERP_NOMEM;
 953         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 954         if (retval)
 955                 return  ZFCP_ERP_FAILED;
 956         return ZFCP_ERP_CONTINUES;
 957 }
 958
 959 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 960 {
 961         struct zfcp_unit *unit = erp_action->unit;
 962
 963         switch (erp_action->step) {
 964         case ZFCP_ERP_STEP_UNINITIALIZED:
 965                 zfcp_erp_unit_strategy_clearstati(unit);
 966                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 967                         return zfcp_erp_unit_strategy_close(erp_action);
 968                 /* already closed, fall through */
 969         case ZFCP_ERP_STEP_UNIT_CLOSING:
 970                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 971                         return ZFCP_ERP_FAILED;
 972                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 973                         return ZFCP_ERP_EXIT;
 974                 return zfcp_erp_unit_strategy_open(erp_action);
 975
 976         case ZFCP_ERP_STEP_UNIT_OPENING:
 977                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 978                         return ZFCP_ERP_SUCCEEDED;
 979         }
 980         return ZFCP_ERP_FAILED;
 981 }
 982
 983 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 984 {
 985         switch (result) {
 986         case ZFCP_ERP_SUCCEEDED :
 987                 atomic_set(&unit->erp_counter, 0);
 988                 zfcp_erp_unit_unblock(unit);
 989                 break;
 990         case ZFCP_ERP_FAILED :
 991                 atomic_inc(&unit->erp_counter);
 992                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
 993                         dev_err(&unit->port->adapter->ccw_device->dev,
 994                                 "ERP failed for unit 0x%016Lx on "
 995                                 "port 0x%016Lx\n",
 996                                 (unsigned long long)unit->fcp_lun,
 997                                 (unsigned long long)unit->port->wwpn);
 998                         zfcp_erp_unit_failed(unit, "erusck1", NULL);
 999                 }
1000                 break;
1001         }
1002
1003         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1004                 zfcp_erp_unit_block(unit, 0);
1005                 result = ZFCP_ERP_EXIT;
1006         }
1007         return result;
1008 }
1009
1010 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1011 {
1012         switch (result) {
1013         case ZFCP_ERP_SUCCEEDED :
1014                 atomic_set(&port->erp_counter, 0);
1015                 zfcp_erp_port_unblock(port);
1016                 break;
1017
1018         case ZFCP_ERP_FAILED :
1019                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1020                         zfcp_erp_port_block(port, 0);
1021                         result = ZFCP_ERP_EXIT;
1022                 }
1023                 atomic_inc(&port->erp_counter);
1024                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1025                         dev_err(&port->adapter->ccw_device->dev,
1026                                 "ERP failed for remote port 0x%016Lx\n",
1027                                 (unsigned long long)port->wwpn);
1028                         zfcp_erp_port_failed(port, "erpsck1", NULL);
1029                 }
1030                 break;
1031         }
1032
1033         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1034                 zfcp_erp_port_block(port, 0);
1035                 result = ZFCP_ERP_EXIT;
1036         }
1037         return result;
1038 }
1039
1040 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1041                                            int result)
1042 {
1043         switch (result) {
1044         case ZFCP_ERP_SUCCEEDED :
1045                 atomic_set(&adapter->erp_counter, 0);
1046                 zfcp_erp_adapter_unblock(adapter);
1047                 break;
1048
1049         case ZFCP_ERP_FAILED :
1050                 atomic_inc(&adapter->erp_counter);
1051                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1052                         dev_err(&adapter->ccw_device->dev,
1053                                 "ERP cannot recover an error "
1054                                 "on the FCP device\n");
1055                         zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1056                 }
1057                 break;
1058         }
1059
1060         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1061                 zfcp_erp_adapter_block(adapter, 0);
1062                 result = ZFCP_ERP_EXIT;
1063         }
1064         return result;
1065 }
1066
1067 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1068                                           int result)
1069 {
1070         struct zfcp_adapter *adapter = erp_action->adapter;
1071         struct zfcp_port *port = erp_action->port;
1072         struct zfcp_unit *unit = erp_action->unit;
1073
1074         switch (erp_action->action) {
1075
1076         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1077                 result = zfcp_erp_strategy_check_unit(unit, result);
1078                 break;
1079
1080         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1081         case ZFCP_ERP_ACTION_REOPEN_PORT:
1082                 result = zfcp_erp_strategy_check_port(port, result);
1083                 break;
1084
1085         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1086                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1087                 break;
1088         }
1089         return result;
1090 }
1091
1092 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1093 {
1094         int status = atomic_read(target_status);
1095
1096         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1097             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1098                 return 1; /* take it online */
1099
1100         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1101             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1102                 return 1; /* take it offline */
1103
1104         return 0;
1105 }
1106
1107 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1108 {
1109         int action = act->action;
1110         struct zfcp_adapter *adapter = act->adapter;
1111         struct zfcp_port *port = act->port;
1112         struct zfcp_unit *unit = act->unit;
1113         u32 erp_status = act->status;
1114
1115         switch (action) {
1116         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1117                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1118                         _zfcp_erp_adapter_reopen(adapter,
1119                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1120                                                  "ersscg1", NULL);
1121                         return ZFCP_ERP_EXIT;
1122                 }
1123                 break;
1124
1125         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1126         case ZFCP_ERP_ACTION_REOPEN_PORT:
1127                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1128                         _zfcp_erp_port_reopen(port,
1129                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1130                                               "ersscg2", NULL);
1131                         return ZFCP_ERP_EXIT;
1132                 }
1133                 break;
1134
1135         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1136                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1137                         _zfcp_erp_unit_reopen(unit,
1138                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1139                                               "ersscg3", NULL);
1140                         return ZFCP_ERP_EXIT;
1141                 }
1142                 break;
1143         }
1144         return ret;
1145 }
1146
1147 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1148 {
1149         struct zfcp_adapter *adapter = erp_action->adapter;
1150
1151         adapter->erp_total_count--;
1152         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1153                 adapter->erp_low_mem_count--;
1154                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1155         }
1156
1157         list_del(&erp_action->list);
1158         zfcp_rec_dbf_event_action("eractd1", erp_action);
1159
1160         switch (erp_action->action) {
1161         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1162                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1163                                   &erp_action->unit->status);
1164                 break;
1165
1166         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1167         case ZFCP_ERP_ACTION_REOPEN_PORT:
1168                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1169                                   &erp_action->port->status);
1170                 break;
1171
1172         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1173                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1174                                   &erp_action->adapter->status);
1175                 break;
1176         }
1177 }
1178
1179 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1180 {
1181         struct zfcp_adapter *adapter = act->adapter;
1182         struct zfcp_port *port = act->port;
1183         struct zfcp_unit *unit = act->unit;
1184
1185         switch (act->action) {
1186         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1187                 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1188                         zfcp_unit_get(unit);
1189                         if (scsi_queue_work(unit->port->adapter->scsi_host,
1190                                             &unit->scsi_work) <= 0)
1191                                 zfcp_unit_put(unit);
1192                 }
1193                 zfcp_unit_put(unit);
1194                 break;
1195
1196         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1197         case ZFCP_ERP_ACTION_REOPEN_PORT:
1198                 if (result == ZFCP_ERP_SUCCEEDED)
1199                         zfcp_scsi_schedule_rport_register(port);
1200                 zfcp_port_put(port);
1201                 break;
1202
1203         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1204                 if (result == ZFCP_ERP_SUCCEEDED) {
1205                         register_service_level(&adapter->service_level);
1206                         schedule_work(&adapter->scan_work);
1207                 } else
1208                         unregister_service_level(&adapter->service_level);
1209                 zfcp_adapter_put(adapter);
1210                 break;
1211         }
1212 }
1213
1214 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1215 {
1216         switch (erp_action->action) {
1217         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1218                 return zfcp_erp_adapter_strategy(erp_action);
1219         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1220                 return zfcp_erp_port_forced_strategy(erp_action);
1221         case ZFCP_ERP_ACTION_REOPEN_PORT:
1222                 return zfcp_erp_port_strategy(erp_action);
1223         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1224                 return zfcp_erp_unit_strategy(erp_action);
1225         }
1226         return ZFCP_ERP_FAILED;
1227 }
1228
1229 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1230 {
1231         int retval;
1232         struct zfcp_adapter *adapter = erp_action->adapter;
1233         unsigned long flags;
1234
1235         read_lock_irqsave(&zfcp_data.config_lock, flags);
1236         write_lock(&adapter->erp_lock);
1237
1238         zfcp_erp_strategy_check_fsfreq(erp_action);
1239
1240         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1241                 zfcp_erp_action_dequeue(erp_action);
1242                 retval = ZFCP_ERP_DISMISSED;
1243                 goto unlock;
1244         }
1245
1246         zfcp_erp_action_to_running(erp_action);
1247
1248         /* no lock to allow for blocking operations */
1249         write_unlock(&adapter->erp_lock);
1250         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1251         retval = zfcp_erp_strategy_do_action(erp_action);
1252         read_lock_irqsave(&zfcp_data.config_lock, flags);
1253         write_lock(&adapter->erp_lock);
1254
1255         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1256                 retval = ZFCP_ERP_CONTINUES;
1257
1258         switch (retval) {
1259         case ZFCP_ERP_NOMEM:
1260                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1261                         ++adapter->erp_low_mem_count;
1262                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1263                 }
1264                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1265                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1266                 else {
1267                         zfcp_erp_strategy_memwait(erp_action);
1268                         retval = ZFCP_ERP_CONTINUES;
1269                 }
1270                 goto unlock;
1271
1272         case ZFCP_ERP_CONTINUES:
1273                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1274                         --adapter->erp_low_mem_count;
1275                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1276                 }
1277                 goto unlock;
1278         }
1279
1280         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1281         zfcp_erp_action_dequeue(erp_action);
1282         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1283         if (retval == ZFCP_ERP_EXIT)
1284                 goto unlock;
1285         zfcp_erp_strategy_followup_actions(erp_action);
1286
1287  unlock:
1288         write_unlock(&adapter->erp_lock);
1289         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1290
1291         if (retval != ZFCP_ERP_CONTINUES)
1292                 zfcp_erp_action_cleanup(erp_action, retval);
1293
1294         return retval;
1295 }
1296
1297 static int zfcp_erp_thread(void *data)
1298 {
1299         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1300         struct list_head *next;
1301         struct zfcp_erp_action *act;
1302         unsigned long flags;
1303         int ignore;
1304
1305         daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1306         /* Block all signals */
1307         siginitsetinv(&current->blocked, 0);
1308         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1309         wake_up(&adapter->erp_thread_wqh);
1310
1311         while (!(atomic_read(&adapter->status) &
1312                  ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1313                 write_lock_irqsave(&adapter->erp_lock, flags);
1314                 next = adapter->erp_ready_head.next;
1315                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1316
1317                 if (next != &adapter->erp_ready_head) {
1318                         act = list_entry(next, struct zfcp_erp_action, list);
1319
1320                         /* there is more to come after dismission, no notify */
1321                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1322                                 zfcp_erp_wakeup(adapter);
1323                 }
1324
1325                 zfcp_rec_dbf_event_thread_lock("erthrd1", adapter);
1326                 ignore = down_interruptible(&adapter->erp_ready_sem);
1327                 zfcp_rec_dbf_event_thread_lock("erthrd2", adapter);
1328         }
1329
1330         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1331         wake_up(&adapter->erp_thread_wqh);
1332
1333         return 0;
1334 }
1335
1336 /**
1337  * zfcp_erp_thread_setup - Start ERP thread for adapter
1338  * @adapter: Adapter to start the ERP thread for
1339  *
1340  * Returns 0 on success or error code from kernel_thread()
1341  */
1342 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1343 {
1344         int retval;
1345
1346         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1347         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1348         if (retval < 0) {
1349                 dev_err(&adapter->ccw_device->dev,
1350                         "Creating an ERP thread for the FCP device failed.\n");
1351                 return retval;
1352         }
1353         wait_event(adapter->erp_thread_wqh,
1354                    atomic_read(&adapter->status) &
1355                         ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1356         return 0;
1357 }
1358
1359 /**
1360  * zfcp_erp_thread_kill - Stop ERP thread.
1361  * @adapter: Adapter where the ERP thread should be stopped.
1362  *
1363  * The caller of this routine ensures that the specified adapter has
1364  * been shut down and that this operation has been completed. Thus,
1365  * there are no pending erp_actions which would need to be handled
1366  * here.
1367  */
1368 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1369 {
1370         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1371         up(&adapter->erp_ready_sem);
1372         zfcp_rec_dbf_event_thread_lock("erthrk1", adapter);
1373
1374         wait_event(adapter->erp_thread_wqh,
1375                    !(atomic_read(&adapter->status) &
1376                                 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1377
1378         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1379                           &adapter->status);
1380 }
1381
1382 /**
1383  * zfcp_erp_adapter_failed - Set adapter status to failed.
1384  * @adapter: Failed adapter.
1385  * @id: Event id for debug trace.
1386  * @ref: Reference for debug trace.
1387  */
1388 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1389 {
1390         zfcp_erp_modify_adapter_status(adapter, id, ref,
1391                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1392 }
1393
1394 /**
1395  * zfcp_erp_port_failed - Set port status to failed.
1396  * @port: Failed port.
1397  * @id: Event id for debug trace.
1398  * @ref: Reference for debug trace.
1399  */
1400 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1401 {
1402         zfcp_erp_modify_port_status(port, id, ref,
1403                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1404 }
1405
1406 /**
1407  * zfcp_erp_unit_failed - Set unit status to failed.
1408  * @unit: Failed unit.
1409  * @id: Event id for debug trace.
1410  * @ref: Reference for debug trace.
1411  */
1412 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1413 {
1414         zfcp_erp_modify_unit_status(unit, id, ref,
1415                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1416 }
1417
1418 /**
1419  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1420  * @adapter: adapter for which to wait for completion of its error recovery
1421  */
1422 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1423 {
1424         wait_event(adapter->erp_done_wqh,
1425                    !(atomic_read(&adapter->status) &
1426                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1427 }
1428
1429 /**
1430  * zfcp_erp_modify_adapter_status - change adapter status bits
1431  * @adapter: adapter to change the status
1432  * @id: id for the debug trace
1433  * @ref: reference for the debug trace
1434  * @mask: status bits to change
1435  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1436  *
1437  * Changes in common status bits are propagated to attached ports and units.
1438  */
1439 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1440                                     void *ref, u32 mask, int set_or_clear)
1441 {
1442         struct zfcp_port *port;
1443         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1444
1445         if (set_or_clear == ZFCP_SET) {
1446                 if (status_change_set(mask, &adapter->status))
1447                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1448                 atomic_set_mask(mask, &adapter->status);
1449         } else {
1450                 if (status_change_clear(mask, &adapter->status))
1451                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1452                 atomic_clear_mask(mask, &adapter->status);
1453                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1454                         atomic_set(&adapter->erp_counter, 0);
1455         }
1456
1457         if (common_mask)
1458                 list_for_each_entry(port, &adapter->port_list_head, list)
1459                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1460                                                     set_or_clear);
1461 }
1462
1463 /**
1464  * zfcp_erp_modify_port_status - change port status bits
1465  * @port: port to change the status bits
1466  * @id: id for the debug trace
1467  * @ref: reference for the debug trace
1468  * @mask: status bits to change
1469  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1470  *
1471  * Changes in common status bits are propagated to attached units.
1472  */
1473 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1474                                  u32 mask, int set_or_clear)
1475 {
1476         struct zfcp_unit *unit;
1477         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1478
1479         if (set_or_clear == ZFCP_SET) {
1480                 if (status_change_set(mask, &port->status))
1481                         zfcp_rec_dbf_event_port(id, ref, port);
1482                 atomic_set_mask(mask, &port->status);
1483         } else {
1484                 if (status_change_clear(mask, &port->status))
1485                         zfcp_rec_dbf_event_port(id, ref, port);
1486                 atomic_clear_mask(mask, &port->status);
1487                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1488                         atomic_set(&port->erp_counter, 0);
1489         }
1490
1491         if (common_mask)
1492                 list_for_each_entry(unit, &port->unit_list_head, list)
1493                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1494                                                     set_or_clear);
1495 }
1496
1497 /**
1498  * zfcp_erp_modify_unit_status - change unit status bits
1499  * @unit: unit to change the status bits
1500  * @id: id for the debug trace
1501  * @ref: reference for the debug trace
1502  * @mask: status bits to change
1503  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1504  */
1505 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1506                                  u32 mask, int set_or_clear)
1507 {
1508         if (set_or_clear == ZFCP_SET) {
1509                 if (status_change_set(mask, &unit->status))
1510                         zfcp_rec_dbf_event_unit(id, ref, unit);
1511                 atomic_set_mask(mask, &unit->status);
1512         } else {
1513                 if (status_change_clear(mask, &unit->status))
1514                         zfcp_rec_dbf_event_unit(id, ref, unit);
1515                 atomic_clear_mask(mask, &unit->status);
1516                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1517                         atomic_set(&unit->erp_counter, 0);
1518                 }
1519         }
1520 }
1521
1522 /**
1523  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1524  * @port: The "boxed" port.
1525  * @id: The debug trace id.
1526  * @id: Reference for the debug trace.
1527  */
1528 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1529 {
1530         unsigned long flags;
1531
1532         read_lock_irqsave(&zfcp_data.config_lock, flags);
1533         zfcp_erp_modify_port_status(port, id, ref,
1534                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1535         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1536         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1537 }
1538
1539 /**
1540  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1541  * @port: The "boxed" unit.
1542  * @id: The debug trace id.
1543  * @id: Reference for the debug trace.
1544  */
1545 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1546 {
1547         zfcp_erp_modify_unit_status(unit, id, ref,
1548                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1549         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1550 }
1551
1552 /**
1553  * zfcp_erp_port_access_denied - Adapter denied access to port.
1554  * @port: port where access has been denied
1555  * @id: id for debug trace
1556  * @ref: reference for debug trace
1557  *
1558  * Since the adapter has denied access, stop using the port and the
1559  * attached units.
1560  */
1561 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1562 {
1563         unsigned long flags;
1564
1565         read_lock_irqsave(&zfcp_data.config_lock, flags);
1566         zfcp_erp_modify_port_status(port, id, ref,
1567                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1568                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1569         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1570 }
1571
1572 /**
1573  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1574  * @unit: unit where access has been denied
1575  * @id: id for debug trace
1576  * @ref: reference for debug trace
1577  *
1578  * Since the adapter has denied access, stop using the unit.
1579  */
1580 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1581 {
1582         zfcp_erp_modify_unit_status(unit, id, ref,
1583                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1584                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1585 }
1586
1587 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1588                                          void *ref)
1589 {
1590         int status = atomic_read(&unit->status);
1591         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1592                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1593                 return;
1594
1595         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1596 }
1597
1598 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1599                                          void *ref)
1600 {
1601         struct zfcp_unit *unit;
1602         int status = atomic_read(&port->status);
1603
1604         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1605                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1606                 list_for_each_entry(unit, &port->unit_list_head, list)
1607                                     zfcp_erp_unit_access_changed(unit, id, ref);
1608                 return;
1609         }
1610
1611         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1612 }
1613
1614 /**
1615  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1616  * @adapter: Adapter where the Access Control Table (ACT) changed
1617  * @id: Id for debug trace
1618  * @ref: Reference for debug trace
1619  */
1620 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1621                                      void *ref)
1622 {
1623         struct zfcp_port *port;
1624         unsigned long flags;
1625
1626         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1627                 return;
1628
1629         read_lock_irqsave(&zfcp_data.config_lock, flags);
1630         list_for_each_entry(port, &adapter->port_list_head, list)
1631                 zfcp_erp_port_access_changed(port, id, ref);
1632         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1633 }