drivers/s390/scsi/zfcp_erp.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Error Recovery Procedures (ERP).
   5  *
   6  * Copyright IBM Corporation 2002, 2010
   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 #include "zfcp_reqlist.h"
  15
  16 #define ZFCP_MAX_ERPS                   3
  17
  18 enum zfcp_erp_act_flags {
  19         ZFCP_STATUS_ERP_TIMEDOUT        = 0x10000000,
  20         ZFCP_STATUS_ERP_CLOSE_ONLY      = 0x01000000,
  21         ZFCP_STATUS_ERP_DISMISSING      = 0x00100000,
  22         ZFCP_STATUS_ERP_DISMISSED       = 0x00200000,
  23         ZFCP_STATUS_ERP_LOWMEM          = 0x00400000,
  24 };
  25
  26 enum zfcp_erp_steps {
  27         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
  28         ZFCP_ERP_STEP_FSF_XCONFIG       = 0x0001,
  29         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
  30         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
  31         ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
  32         ZFCP_ERP_STEP_UNIT_CLOSING      = 0x1000,
  33         ZFCP_ERP_STEP_UNIT_OPENING      = 0x2000,
  34 };
  35
  36 enum zfcp_erp_act_type {
  37         ZFCP_ERP_ACTION_REOPEN_UNIT        = 1,
  38         ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
  39         ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
  40         ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
  41 };
  42
  43 enum zfcp_erp_act_state {
  44         ZFCP_ERP_ACTION_RUNNING = 1,
  45         ZFCP_ERP_ACTION_READY   = 2,
  46 };
  47
  48 enum zfcp_erp_act_result {
  49         ZFCP_ERP_SUCCEEDED = 0,
  50         ZFCP_ERP_FAILED    = 1,
  51         ZFCP_ERP_CONTINUES = 2,
  52         ZFCP_ERP_EXIT      = 3,
  53         ZFCP_ERP_DISMISSED = 4,
  54         ZFCP_ERP_NOMEM     = 5,
  55 };
  56
  57 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
  58 {
  59         zfcp_erp_modify_adapter_status(adapter, "erablk1", NULL,
  60                                        ZFCP_STATUS_COMMON_UNBLOCKED | mask,
  61                                        ZFCP_CLEAR);
  62 }
  63
  64 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
  65 {
  66         struct zfcp_erp_action *curr_act;
  67
  68         list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
  69                 if (act == curr_act)
  70                         return ZFCP_ERP_ACTION_RUNNING;
  71         return 0;
  72 }
  73
  74 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
  75 {
  76         struct zfcp_adapter *adapter = act->adapter;
  77
  78         list_move(&act->list, &act->adapter->erp_ready_head);
  79         zfcp_dbf_rec_action("erardy1", act);
  80         wake_up(&adapter->erp_ready_wq);
  81         zfcp_dbf_rec_thread("erardy2", adapter->dbf);
  82 }
  83
  84 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
  85 {
  86         act->status |= ZFCP_STATUS_ERP_DISMISSED;
  87         if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
  88                 zfcp_erp_action_ready(act);
  89 }
  90
  91 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
  92 {
  93         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
  94                 zfcp_erp_action_dismiss(&unit->erp_action);
  95 }
  96
  97 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
  98 {
  99         struct zfcp_unit *unit;
 100
 101         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 102                 zfcp_erp_action_dismiss(&port->erp_action);
 103         else {
 104                 read_lock(&port->unit_list_lock);
 105                 list_for_each_entry(unit, &port->unit_list, list)
 106                         zfcp_erp_action_dismiss_unit(unit);
 107                 read_unlock(&port->unit_list_lock);
 108         }
 109 }
 110
 111 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 112 {
 113         struct zfcp_port *port;
 114
 115         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 116                 zfcp_erp_action_dismiss(&adapter->erp_action);
 117         else {
 118                 read_lock(&adapter->port_list_lock);
 119                 list_for_each_entry(port, &adapter->port_list, list)
 120                     zfcp_erp_action_dismiss_port(port);
 121                 read_unlock(&adapter->port_list_lock);
 122         }
 123 }
 124
 125 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 126                                  struct zfcp_port *port,
 127                                  struct zfcp_unit *unit)
 128 {
 129         int need = want;
 130         int u_status, p_status, a_status;
 131
 132         switch (want) {
 133         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 134                 u_status = atomic_read(&unit->status);
 135                 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 136                         return 0;
 137                 p_status = atomic_read(&port->status);
 138                 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
 139                       p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 140                         return 0;
 141                 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 142                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 143                 /* fall through */
 144         case ZFCP_ERP_ACTION_REOPEN_PORT:
 145         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 146                 p_status = atomic_read(&port->status);
 147                 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 148                         return 0;
 149                 a_status = atomic_read(&adapter->status);
 150                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
 151                       a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 152                         return 0;
 153                 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 154                         need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
 155                 /* fall through */
 156         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 157                 a_status = atomic_read(&adapter->status);
 158                 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 159                         return 0;
 160                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
 161                     !(a_status & ZFCP_STATUS_COMMON_OPEN))
 162                         return 0; /* shutdown requested for closed adapter */
 163         }
 164
 165         return need;
 166 }
 167
 168 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
 169                                                   struct zfcp_adapter *adapter,
 170                                                   struct zfcp_port *port,
 171                                                   struct zfcp_unit *unit)
 172 {
 173         struct zfcp_erp_action *erp_action;
 174         u32 status = 0;
 175
 176         switch (need) {
 177         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 178                 if (!get_device(&unit->dev))
 179                         return NULL;
 180                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
 181                 erp_action = &unit->erp_action;
 182                 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
 183                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 184                 break;
 185
 186         case ZFCP_ERP_ACTION_REOPEN_PORT:
 187         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 188                 if (!get_device(&port->dev))
 189                         return NULL;
 190                 zfcp_erp_action_dismiss_port(port);
 191                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
 192                 erp_action = &port->erp_action;
 193                 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
 194                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 195                 break;
 196
 197         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 198                 kref_get(&adapter->ref);
 199                 zfcp_erp_action_dismiss_adapter(adapter);
 200                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
 201                 erp_action = &adapter->erp_action;
 202                 if (!(atomic_read(&adapter->status) &
 203                       ZFCP_STATUS_COMMON_RUNNING))
 204                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 205                 break;
 206
 207         default:
 208                 return NULL;
 209         }
 210
 211         memset(erp_action, 0, sizeof(struct zfcp_erp_action));
 212         erp_action->adapter = adapter;
 213         erp_action->port = port;
 214         erp_action->unit = unit;
 215         erp_action->action = need;
 216         erp_action->status = status;
 217
 218         return erp_action;
 219 }
 220
 221 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 222                                    struct zfcp_port *port,
 223                                    struct zfcp_unit *unit, char *id, void *ref)
 224 {
 225         int retval = 1, need;
 226         struct zfcp_erp_action *act = NULL;
 227
 228         if (!adapter->erp_thread)
 229                 return -EIO;
 230
 231         need = zfcp_erp_required_act(want, adapter, port, unit);
 232         if (!need)
 233                 goto out;
 234
 235         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 236         act = zfcp_erp_setup_act(need, adapter, port, unit);
 237         if (!act)
 238                 goto out;
 239         ++adapter->erp_total_count;
 240         list_add_tail(&act->list, &adapter->erp_ready_head);
 241         wake_up(&adapter->erp_ready_wq);
 242         zfcp_dbf_rec_thread("eracte1", adapter->dbf);
 243         retval = 0;
 244  out:
 245         zfcp_dbf_rec_trigger(id, ref, want, need, act, adapter, port, unit);
 246         return retval;
 247 }
 248
 249 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 250                                     int clear_mask, char *id, void *ref)
 251 {
 252         zfcp_erp_adapter_block(adapter, clear_mask);
 253         zfcp_scsi_schedule_rports_block(adapter);
 254
 255         /* ensure propagation of failed status to new devices */
 256         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 257                 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
 258                 return -EIO;
 259         }
 260         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 261                                        adapter, NULL, NULL, id, ref);
 262 }
 263
 264 /**
 265  * zfcp_erp_adapter_reopen - Reopen adapter.
 266  * @adapter: Adapter to reopen.
 267  * @clear: Status flags to clear.
 268  * @id: Id for debug trace event.
 269  * @ref: Reference for debug trace event.
 270  */
 271 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
 272                              char *id, void *ref)
 273 {
 274         unsigned long flags;
 275
 276         zfcp_erp_adapter_block(adapter, clear);
 277         zfcp_scsi_schedule_rports_block(adapter);
 278
 279         write_lock_irqsave(&adapter->erp_lock, flags);
 280         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 281                 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
 282         else
 283                 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter,
 284                                         NULL, NULL, id, ref);
 285         write_unlock_irqrestore(&adapter->erp_lock, flags);
 286 }
 287
 288 /**
 289  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 290  * @adapter: Adapter to shut down.
 291  * @clear: Status flags to clear.
 292  * @id: Id for debug trace event.
 293  * @ref: Reference for debug trace event.
 294  */
 295 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 296                                char *id, void *ref)
 297 {
 298         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 299         zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
 300 }
 301
 302 /**
 303  * zfcp_erp_port_shutdown - Shutdown port
 304  * @port: Port to shut down.
 305  * @clear: Status flags to clear.
 306  * @id: Id for debug trace event.
 307  * @ref: Reference for debug trace event.
 308  */
 309 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id,
 310                             void *ref)
 311 {
 312         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 313         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 314 }
 315
 316 /**
 317  * zfcp_erp_unit_shutdown - Shutdown unit
 318  * @unit: Unit to shut down.
 319  * @clear: Status flags to clear.
 320  * @id: Id for debug trace event.
 321  * @ref: Reference for debug trace event.
 322  */
 323 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
 324                             void *ref)
 325 {
 326         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 327         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 328 }
 329
 330 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 331 {
 332         zfcp_erp_modify_port_status(port, "erpblk1", NULL,
 333                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 334                                     ZFCP_CLEAR);
 335 }
 336
 337 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 338                                          int clear, char *id, void *ref)
 339 {
 340         zfcp_erp_port_block(port, clear);
 341         zfcp_scsi_schedule_rport_block(port);
 342
 343         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 344                 return;
 345
 346         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 347                                 port->adapter, port, NULL, id, ref);
 348 }
 349
 350 /**
 351  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 352  * @port: Port to force close and to reopen.
 353  * @id: Id for debug trace event.
 354  * @ref: Reference for debug trace event.
 355  */
 356 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id,
 357                                  void *ref)
 358 {
 359         unsigned long flags;
 360         struct zfcp_adapter *adapter = port->adapter;
 361
 362         write_lock_irqsave(&adapter->erp_lock, flags);
 363         _zfcp_erp_port_forced_reopen(port, clear, id, ref);
 364         write_unlock_irqrestore(&adapter->erp_lock, flags);
 365 }
 366
 367 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id,
 368                                  void *ref)
 369 {
 370         zfcp_erp_port_block(port, clear);
 371         zfcp_scsi_schedule_rport_block(port);
 372
 373         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 374                 /* ensure propagation of failed status to new devices */
 375                 zfcp_erp_port_failed(port, "erpreo1", NULL);
 376                 return -EIO;
 377         }
 378
 379         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 380                                        port->adapter, port, NULL, id, ref);
 381 }
 382
 383 /**
 384  * zfcp_erp_port_reopen - trigger remote port recovery
 385  * @port: port to recover
 386  * @clear_mask: flags in port status to be cleared
 387  *
 388  * Returns 0 if recovery has been triggered, < 0 if not.
 389  */
 390 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
 391 {
 392         int retval;
 393         unsigned long flags;
 394         struct zfcp_adapter *adapter = port->adapter;
 395
 396         write_lock_irqsave(&adapter->erp_lock, flags);
 397         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 398         write_unlock_irqrestore(&adapter->erp_lock, flags);
 399
 400         return retval;
 401 }
 402
 403 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 404 {
 405         zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
 406                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 407                                     ZFCP_CLEAR);
 408 }
 409
 410 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 411                                   void *ref)
 412 {
 413         struct zfcp_adapter *adapter = unit->port->adapter;
 414
 415         zfcp_erp_unit_block(unit, clear);
 416
 417         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 418                 return;
 419
 420         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 421                                 adapter, unit->port, unit, id, ref);
 422 }
 423
 424 /**
 425  * zfcp_erp_unit_reopen - initiate reopen of a unit
 426  * @unit: unit to be reopened
 427  * @clear_mask: specifies flags in unit status to be cleared
 428  * Return: 0 on success, < 0 on error
 429  */
 430 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 431                           void *ref)
 432 {
 433         unsigned long flags;
 434         struct zfcp_port *port = unit->port;
 435         struct zfcp_adapter *adapter = port->adapter;
 436
 437         write_lock_irqsave(&adapter->erp_lock, flags);
 438         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 439         write_unlock_irqrestore(&adapter->erp_lock, flags);
 440 }
 441
 442 static int status_change_set(unsigned long mask, atomic_t *status)
 443 {
 444         return (atomic_read(status) ^ mask) & mask;
 445 }
 446
 447 static int status_change_clear(unsigned long mask, atomic_t *status)
 448 {
 449         return atomic_read(status) & mask;
 450 }
 451
 452 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 453 {
 454         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 455                 zfcp_dbf_rec_adapter("eraubl1", NULL, adapter->dbf);
 456         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 457 }
 458
 459 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 460 {
 461         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 462                 zfcp_dbf_rec_port("erpubl1", NULL, port);
 463         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 464 }
 465
 466 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 467 {
 468         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 469                 zfcp_dbf_rec_unit("eruubl1", NULL, unit);
 470         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 471 }
 472
 473 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 474 {
 475         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 476         zfcp_dbf_rec_action("erator1", erp_action);
 477 }
 478
 479 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 480 {
 481         struct zfcp_adapter *adapter = act->adapter;
 482         struct zfcp_fsf_req *req;
 483
 484         if (!act->fsf_req_id)
 485                 return;
 486
 487         spin_lock(&adapter->req_list->lock);
 488         req = _zfcp_reqlist_find(adapter->req_list, act->fsf_req_id);
 489         if (req && req->erp_action == act) {
 490                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 491                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 492                         req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 493                         zfcp_dbf_rec_action("erscf_1", act);
 494                         req->erp_action = NULL;
 495                 }
 496                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 497                         zfcp_dbf_rec_action("erscf_2", act);
 498                 if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
 499                         act->fsf_req_id = 0;
 500         } else
 501                 act->fsf_req_id = 0;
 502         spin_unlock(&adapter->req_list->lock);
 503 }
 504
 505 /**
 506  * zfcp_erp_notify - Trigger ERP action.
 507  * @erp_action: ERP action to continue.
 508  * @set_mask: ERP action status flags to set.
 509  */
 510 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 511 {
 512         struct zfcp_adapter *adapter = erp_action->adapter;
 513         unsigned long flags;
 514
 515         write_lock_irqsave(&adapter->erp_lock, flags);
 516         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 517                 erp_action->status |= set_mask;
 518                 zfcp_erp_action_ready(erp_action);
 519         }
 520         write_unlock_irqrestore(&adapter->erp_lock, flags);
 521 }
 522
 523 /**
 524  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 525  * @data: ERP action (from timer data)
 526  */
 527 void zfcp_erp_timeout_handler(unsigned long data)
 528 {
 529         struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
 530         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 531 }
 532
 533 static void zfcp_erp_memwait_handler(unsigned long data)
 534 {
 535         zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
 536 }
 537
 538 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 539 {
 540         init_timer(&erp_action->timer);
 541         erp_action->timer.function = zfcp_erp_memwait_handler;
 542         erp_action->timer.data = (unsigned long) erp_action;
 543         erp_action->timer.expires = jiffies + HZ;
 544         add_timer(&erp_action->timer);
 545 }
 546
 547 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 548                                       int clear, char *id, void *ref)
 549 {
 550         struct zfcp_port *port;
 551
 552         read_lock(&adapter->port_list_lock);
 553         list_for_each_entry(port, &adapter->port_list, list)
 554                 _zfcp_erp_port_reopen(port, clear, id, ref);
 555         read_unlock(&adapter->port_list_lock);
 556 }
 557
 558 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
 559                                       char *id, void *ref)
 560 {
 561         struct zfcp_unit *unit;
 562
 563         read_lock(&port->unit_list_lock);
 564         list_for_each_entry(unit, &port->unit_list, list)
 565                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 566         read_unlock(&port->unit_list_lock);
 567 }
 568
 569 static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
 570 {
 571         switch (act->action) {
 572         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 573                 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1", NULL);
 574                 break;
 575         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 576                 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2", NULL);
 577                 break;
 578         case ZFCP_ERP_ACTION_REOPEN_PORT:
 579                 _zfcp_erp_port_reopen(act->port, 0, "ersff_3", NULL);
 580                 break;
 581         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 582                 _zfcp_erp_unit_reopen(act->unit, 0, "ersff_4", NULL);
 583                 break;
 584         }
 585 }
 586
 587 static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
 588 {
 589         switch (act->action) {
 590         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 591                 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1", NULL);
 592                 break;
 593         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 594                 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2", NULL);
 595                 break;
 596         case ZFCP_ERP_ACTION_REOPEN_PORT:
 597                 _zfcp_erp_unit_reopen_all(act->port, 0, "ersfs_3", NULL);
 598                 break;
 599         }
 600 }
 601
 602 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 603 {
 604         unsigned long flags;
 605
 606         read_lock_irqsave(&adapter->erp_lock, flags);
 607         if (list_empty(&adapter->erp_ready_head) &&
 608             list_empty(&adapter->erp_running_head)) {
 609                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 610                                           &adapter->status);
 611                         wake_up(&adapter->erp_done_wqh);
 612         }
 613         read_unlock_irqrestore(&adapter->erp_lock, flags);
 614 }
 615
 616 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 617 {
 618         struct zfcp_qdio *qdio = act->adapter->qdio;
 619
 620         if (zfcp_qdio_open(qdio))
 621                 return ZFCP_ERP_FAILED;
 622         init_waitqueue_head(&qdio->req_q_wq);
 623         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 624         return ZFCP_ERP_SUCCEEDED;
 625 }
 626
 627 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 628 {
 629         struct zfcp_port *port;
 630         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 631                                  adapter->peer_d_id);
 632         if (IS_ERR(port)) /* error or port already attached */
 633                 return;
 634         _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
 635 }
 636
 637 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 638 {
 639         int retries;
 640         int sleep = 1;
 641         struct zfcp_adapter *adapter = erp_action->adapter;
 642
 643         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 644
 645         for (retries = 7; retries; retries--) {
 646                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 647                                   &adapter->status);
 648                 write_lock_irq(&adapter->erp_lock);
 649                 zfcp_erp_action_to_running(erp_action);
 650                 write_unlock_irq(&adapter->erp_lock);
 651                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 652                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 653                                           &adapter->status);
 654                         return ZFCP_ERP_FAILED;
 655                 }
 656
 657                 zfcp_dbf_rec_thread_lock("erasfx1", adapter->dbf);
 658                 wait_event(adapter->erp_ready_wq,
 659                            !list_empty(&adapter->erp_ready_head));
 660                 zfcp_dbf_rec_thread_lock("erasfx2", adapter->dbf);
 661                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 662                         break;
 663
 664                 if (!(atomic_read(&adapter->status) &
 665                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 666                         break;
 667
 668                 ssleep(sleep);
 669                 sleep *= 2;
 670         }
 671
 672         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 673                           &adapter->status);
 674
 675         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 676                 return ZFCP_ERP_FAILED;
 677
 678         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 679                 zfcp_erp_enqueue_ptp_port(adapter);
 680
 681         return ZFCP_ERP_SUCCEEDED;
 682 }
 683
 684 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 685 {
 686         int ret;
 687         struct zfcp_adapter *adapter = act->adapter;
 688
 689         write_lock_irq(&adapter->erp_lock);
 690         zfcp_erp_action_to_running(act);
 691         write_unlock_irq(&adapter->erp_lock);
 692
 693         ret = zfcp_fsf_exchange_port_data(act);
 694         if (ret == -EOPNOTSUPP)
 695                 return ZFCP_ERP_SUCCEEDED;
 696         if (ret)
 697                 return ZFCP_ERP_FAILED;
 698
 699         zfcp_dbf_rec_thread_lock("erasox1", adapter->dbf);
 700         wait_event(adapter->erp_ready_wq,
 701                    !list_empty(&adapter->erp_ready_head));
 702         zfcp_dbf_rec_thread_lock("erasox2", adapter->dbf);
 703         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 704                 return ZFCP_ERP_FAILED;
 705
 706         return ZFCP_ERP_SUCCEEDED;
 707 }
 708
 709 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 710 {
 711         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 712                 return ZFCP_ERP_FAILED;
 713
 714         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 715                 return ZFCP_ERP_FAILED;
 716
 717         atomic_set(&act->adapter->stat_miss, act->adapter->stat_read_buf_num);
 718         if (zfcp_status_read_refill(act->adapter))
 719                 return ZFCP_ERP_FAILED;
 720
 721         return ZFCP_ERP_SUCCEEDED;
 722 }
 723
 724 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 725 {
 726         struct zfcp_adapter *adapter = act->adapter;
 727
 728         /* close queues to ensure that buffers are not accessed by adapter */
 729         zfcp_qdio_close(adapter->qdio);
 730         zfcp_fsf_req_dismiss_all(adapter);
 731         adapter->fsf_req_seq_no = 0;
 732         zfcp_fc_wka_ports_force_offline(adapter->gs);
 733         /* all ports and units are closed */
 734         zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
 735                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 736
 737         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 738                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 739 }
 740
 741 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
 742 {
 743         struct zfcp_adapter *adapter = act->adapter;
 744
 745         if (zfcp_erp_adapter_strategy_open_qdio(act)) {
 746                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 747                                   ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 748                                   &adapter->status);
 749                 return ZFCP_ERP_FAILED;
 750         }
 751
 752         if (zfcp_erp_adapter_strategy_open_fsf(act)) {
 753                 zfcp_erp_adapter_strategy_close(act);
 754                 return ZFCP_ERP_FAILED;
 755         }
 756
 757         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
 758
 759         return ZFCP_ERP_SUCCEEDED;
 760 }
 761
 762 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 763 {
 764         struct zfcp_adapter *adapter = act->adapter;
 765
 766         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
 767                 zfcp_erp_adapter_strategy_close(act);
 768                 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 769                         return ZFCP_ERP_EXIT;
 770         }
 771
 772         if (zfcp_erp_adapter_strategy_open(act)) {
 773                 ssleep(8);
 774                 return ZFCP_ERP_FAILED;
 775         }
 776
 777         return ZFCP_ERP_SUCCEEDED;
 778 }
 779
 780 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 781 {
 782         int retval;
 783
 784         retval = zfcp_fsf_close_physical_port(act);
 785         if (retval == -ENOMEM)
 786                 return ZFCP_ERP_NOMEM;
 787         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 788         if (retval)
 789                 return ZFCP_ERP_FAILED;
 790
 791         return ZFCP_ERP_CONTINUES;
 792 }
 793
 794 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 795 {
 796         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
 797 }
 798
 799 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 800 {
 801         struct zfcp_port *port = erp_action->port;
 802         int status = atomic_read(&port->status);
 803
 804         switch (erp_action->step) {
 805         case ZFCP_ERP_STEP_UNINITIALIZED:
 806                 zfcp_erp_port_strategy_clearstati(port);
 807                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 808                     (status & ZFCP_STATUS_COMMON_OPEN))
 809                         return zfcp_erp_port_forced_strategy_close(erp_action);
 810                 else
 811                         return ZFCP_ERP_FAILED;
 812
 813         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 814                 if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
 815                         return ZFCP_ERP_SUCCEEDED;
 816         }
 817         return ZFCP_ERP_FAILED;
 818 }
 819
 820 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 821 {
 822         int retval;
 823
 824         retval = zfcp_fsf_close_port(erp_action);
 825         if (retval == -ENOMEM)
 826                 return ZFCP_ERP_NOMEM;
 827         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 828         if (retval)
 829                 return ZFCP_ERP_FAILED;
 830         return ZFCP_ERP_CONTINUES;
 831 }
 832
 833 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 834 {
 835         int retval;
 836
 837         retval = zfcp_fsf_open_port(erp_action);
 838         if (retval == -ENOMEM)
 839                 return ZFCP_ERP_NOMEM;
 840         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 841         if (retval)
 842                 return ZFCP_ERP_FAILED;
 843         return ZFCP_ERP_CONTINUES;
 844 }
 845
 846 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 847 {
 848         struct zfcp_adapter *adapter = act->adapter;
 849         struct zfcp_port *port = act->port;
 850
 851         if (port->wwpn != adapter->peer_wwpn) {
 852                 zfcp_erp_port_failed(port, "eroptp1", NULL);
 853                 return ZFCP_ERP_FAILED;
 854         }
 855         port->d_id = adapter->peer_d_id;
 856         return zfcp_erp_port_strategy_open_port(act);
 857 }
 858
 859 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 860 {
 861         struct zfcp_adapter *adapter = act->adapter;
 862         struct zfcp_port *port = act->port;
 863         int p_status = atomic_read(&port->status);
 864
 865         switch (act->step) {
 866         case ZFCP_ERP_STEP_UNINITIALIZED:
 867         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 868         case ZFCP_ERP_STEP_PORT_CLOSING:
 869                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 870                         return zfcp_erp_open_ptp_port(act);
 871                 if (!port->d_id) {
 872                         zfcp_fc_trigger_did_lookup(port);
 873                         return ZFCP_ERP_EXIT;
 874                 }
 875                 return zfcp_erp_port_strategy_open_port(act);
 876
 877         case ZFCP_ERP_STEP_PORT_OPENING:
 878                 /* D_ID might have changed during open */
 879                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 880                         if (!port->d_id) {
 881                                 zfcp_fc_trigger_did_lookup(port);
 882                                 return ZFCP_ERP_EXIT;
 883                         }
 884                         return ZFCP_ERP_SUCCEEDED;
 885                 }
 886                 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
 887                         port->d_id = 0;
 888                         _zfcp_erp_port_reopen(port, 0, "erpsoc1", NULL);
 889                         return ZFCP_ERP_EXIT;
 890                 }
 891                 /* fall through otherwise */
 892         }
 893         return ZFCP_ERP_FAILED;
 894 }
 895
 896 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 897 {
 898         struct zfcp_port *port = erp_action->port;
 899         int p_status = atomic_read(&port->status);
 900
 901         if ((p_status & ZFCP_STATUS_COMMON_NOESC) &&
 902             !(p_status & ZFCP_STATUS_COMMON_OPEN))
 903                 goto close_init_done;
 904
 905         switch (erp_action->step) {
 906         case ZFCP_ERP_STEP_UNINITIALIZED:
 907                 zfcp_erp_port_strategy_clearstati(port);
 908                 if (p_status & ZFCP_STATUS_COMMON_OPEN)
 909                         return zfcp_erp_port_strategy_close(erp_action);
 910                 break;
 911
 912         case ZFCP_ERP_STEP_PORT_CLOSING:
 913                 if (p_status & ZFCP_STATUS_COMMON_OPEN)
 914                         return ZFCP_ERP_FAILED;
 915                 break;
 916         }
 917
 918 close_init_done:
 919         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 920                 return ZFCP_ERP_EXIT;
 921
 922         return zfcp_erp_port_strategy_open_common(erp_action);
 923 }
 924
 925 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 926 {
 927         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 928                           ZFCP_STATUS_UNIT_SHARED |
 929                           ZFCP_STATUS_UNIT_READONLY,
 930                           &unit->status);
 931 }
 932
 933 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 934 {
 935         int retval = zfcp_fsf_close_unit(erp_action);
 936         if (retval == -ENOMEM)
 937                 return ZFCP_ERP_NOMEM;
 938         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 939         if (retval)
 940                 return ZFCP_ERP_FAILED;
 941         return ZFCP_ERP_CONTINUES;
 942 }
 943
 944 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 945 {
 946         int retval = zfcp_fsf_open_unit(erp_action);
 947         if (retval == -ENOMEM)
 948                 return ZFCP_ERP_NOMEM;
 949         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 950         if (retval)
 951                 return  ZFCP_ERP_FAILED;
 952         return ZFCP_ERP_CONTINUES;
 953 }
 954
 955 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 956 {
 957         struct zfcp_unit *unit = erp_action->unit;
 958
 959         switch (erp_action->step) {
 960         case ZFCP_ERP_STEP_UNINITIALIZED:
 961                 zfcp_erp_unit_strategy_clearstati(unit);
 962                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 963                         return zfcp_erp_unit_strategy_close(erp_action);
 964                 /* already closed, fall through */
 965         case ZFCP_ERP_STEP_UNIT_CLOSING:
 966                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 967                         return ZFCP_ERP_FAILED;
 968                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 969                         return ZFCP_ERP_EXIT;
 970                 return zfcp_erp_unit_strategy_open(erp_action);
 971
 972         case ZFCP_ERP_STEP_UNIT_OPENING:
 973                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 974                         return ZFCP_ERP_SUCCEEDED;
 975         }
 976         return ZFCP_ERP_FAILED;
 977 }
 978
 979 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 980 {
 981         switch (result) {
 982         case ZFCP_ERP_SUCCEEDED :
 983                 atomic_set(&unit->erp_counter, 0);
 984                 zfcp_erp_unit_unblock(unit);
 985                 break;
 986         case ZFCP_ERP_FAILED :
 987                 atomic_inc(&unit->erp_counter);
 988                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
 989                         dev_err(&unit->port->adapter->ccw_device->dev,
 990                                 "ERP failed for unit 0x%016Lx on "
 991                                 "port 0x%016Lx\n",
 992                                 (unsigned long long)unit->fcp_lun,
 993                                 (unsigned long long)unit->port->wwpn);
 994                         zfcp_erp_unit_failed(unit, "erusck1", NULL);
 995                 }
 996                 break;
 997         }
 998
 999         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1000                 zfcp_erp_unit_block(unit, 0);
1001                 result = ZFCP_ERP_EXIT;
1002         }
1003         return result;
1004 }
1005
1006 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1007 {
1008         switch (result) {
1009         case ZFCP_ERP_SUCCEEDED :
1010                 atomic_set(&port->erp_counter, 0);
1011                 zfcp_erp_port_unblock(port);
1012                 break;
1013
1014         case ZFCP_ERP_FAILED :
1015                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1016                         zfcp_erp_port_block(port, 0);
1017                         result = ZFCP_ERP_EXIT;
1018                 }
1019                 atomic_inc(&port->erp_counter);
1020                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1021                         dev_err(&port->adapter->ccw_device->dev,
1022                                 "ERP failed for remote port 0x%016Lx\n",
1023                                 (unsigned long long)port->wwpn);
1024                         zfcp_erp_port_failed(port, "erpsck1", NULL);
1025                 }
1026                 break;
1027         }
1028
1029         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1030                 zfcp_erp_port_block(port, 0);
1031                 result = ZFCP_ERP_EXIT;
1032         }
1033         return result;
1034 }
1035
1036 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1037                                            int result)
1038 {
1039         switch (result) {
1040         case ZFCP_ERP_SUCCEEDED :
1041                 atomic_set(&adapter->erp_counter, 0);
1042                 zfcp_erp_adapter_unblock(adapter);
1043                 break;
1044
1045         case ZFCP_ERP_FAILED :
1046                 atomic_inc(&adapter->erp_counter);
1047                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1048                         dev_err(&adapter->ccw_device->dev,
1049                                 "ERP cannot recover an error "
1050                                 "on the FCP device\n");
1051                         zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1052                 }
1053                 break;
1054         }
1055
1056         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1057                 zfcp_erp_adapter_block(adapter, 0);
1058                 result = ZFCP_ERP_EXIT;
1059         }
1060         return result;
1061 }
1062
1063 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1064                                           int result)
1065 {
1066         struct zfcp_adapter *adapter = erp_action->adapter;
1067         struct zfcp_port *port = erp_action->port;
1068         struct zfcp_unit *unit = erp_action->unit;
1069
1070         switch (erp_action->action) {
1071
1072         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1073                 result = zfcp_erp_strategy_check_unit(unit, result);
1074                 break;
1075
1076         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1077         case ZFCP_ERP_ACTION_REOPEN_PORT:
1078                 result = zfcp_erp_strategy_check_port(port, result);
1079                 break;
1080
1081         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1082                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1083                 break;
1084         }
1085         return result;
1086 }
1087
1088 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1089 {
1090         int status = atomic_read(target_status);
1091
1092         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1093             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1094                 return 1; /* take it online */
1095
1096         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1097             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1098                 return 1; /* take it offline */
1099
1100         return 0;
1101 }
1102
1103 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1104 {
1105         int action = act->action;
1106         struct zfcp_adapter *adapter = act->adapter;
1107         struct zfcp_port *port = act->port;
1108         struct zfcp_unit *unit = act->unit;
1109         u32 erp_status = act->status;
1110
1111         switch (action) {
1112         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1113                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1114                         _zfcp_erp_adapter_reopen(adapter,
1115                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1116                                                  "ersscg1", NULL);
1117                         return ZFCP_ERP_EXIT;
1118                 }
1119                 break;
1120
1121         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1122         case ZFCP_ERP_ACTION_REOPEN_PORT:
1123                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1124                         _zfcp_erp_port_reopen(port,
1125                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1126                                               "ersscg2", NULL);
1127                         return ZFCP_ERP_EXIT;
1128                 }
1129                 break;
1130
1131         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1132                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1133                         _zfcp_erp_unit_reopen(unit,
1134                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1135                                               "ersscg3", NULL);
1136                         return ZFCP_ERP_EXIT;
1137                 }
1138                 break;
1139         }
1140         return ret;
1141 }
1142
1143 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1144 {
1145         struct zfcp_adapter *adapter = erp_action->adapter;
1146
1147         adapter->erp_total_count--;
1148         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1149                 adapter->erp_low_mem_count--;
1150                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1151         }
1152
1153         list_del(&erp_action->list);
1154         zfcp_dbf_rec_action("eractd1", erp_action);
1155
1156         switch (erp_action->action) {
1157         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1158                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1159                                   &erp_action->unit->status);
1160                 break;
1161
1162         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1163         case ZFCP_ERP_ACTION_REOPEN_PORT:
1164                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1165                                   &erp_action->port->status);
1166                 break;
1167
1168         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1169                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1170                                   &erp_action->adapter->status);
1171                 break;
1172         }
1173 }
1174
1175 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1176 {
1177         struct zfcp_adapter *adapter = act->adapter;
1178         struct zfcp_port *port = act->port;
1179         struct zfcp_unit *unit = act->unit;
1180
1181         switch (act->action) {
1182         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1183                 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1184                         get_device(&unit->dev);
1185                         if (scsi_queue_work(unit->port->adapter->scsi_host,
1186                                             &unit->scsi_work) <= 0)
1187                                 put_device(&unit->dev);
1188                 }
1189                 put_device(&unit->dev);
1190                 break;
1191
1192         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1193         case ZFCP_ERP_ACTION_REOPEN_PORT:
1194                 if (result == ZFCP_ERP_SUCCEEDED)
1195                         zfcp_scsi_schedule_rport_register(port);
1196                 put_device(&port->dev);
1197                 break;
1198
1199         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1200                 if (result == ZFCP_ERP_SUCCEEDED) {
1201                         register_service_level(&adapter->service_level);
1202                         queue_work(adapter->work_queue, &adapter->scan_work);
1203                 } else
1204                         unregister_service_level(&adapter->service_level);
1205                 kref_put(&adapter->ref, zfcp_adapter_release);
1206                 break;
1207         }
1208 }
1209
1210 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1211 {
1212         switch (erp_action->action) {
1213         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1214                 return zfcp_erp_adapter_strategy(erp_action);
1215         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1216                 return zfcp_erp_port_forced_strategy(erp_action);
1217         case ZFCP_ERP_ACTION_REOPEN_PORT:
1218                 return zfcp_erp_port_strategy(erp_action);
1219         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1220                 return zfcp_erp_unit_strategy(erp_action);
1221         }
1222         return ZFCP_ERP_FAILED;
1223 }
1224
1225 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1226 {
1227         int retval;
1228         unsigned long flags;
1229         struct zfcp_adapter *adapter = erp_action->adapter;
1230
1231         kref_get(&adapter->ref);
1232
1233         write_lock_irqsave(&adapter->erp_lock, flags);
1234         zfcp_erp_strategy_check_fsfreq(erp_action);
1235
1236         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1237                 zfcp_erp_action_dequeue(erp_action);
1238                 retval = ZFCP_ERP_DISMISSED;
1239                 goto unlock;
1240         }
1241
1242         zfcp_erp_action_to_running(erp_action);
1243
1244         /* no lock to allow for blocking operations */
1245         write_unlock_irqrestore(&adapter->erp_lock, flags);
1246         retval = zfcp_erp_strategy_do_action(erp_action);
1247         write_lock_irqsave(&adapter->erp_lock, flags);
1248
1249         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1250                 retval = ZFCP_ERP_CONTINUES;
1251
1252         switch (retval) {
1253         case ZFCP_ERP_NOMEM:
1254                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1255                         ++adapter->erp_low_mem_count;
1256                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1257                 }
1258                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1259                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1260                 else {
1261                         zfcp_erp_strategy_memwait(erp_action);
1262                         retval = ZFCP_ERP_CONTINUES;
1263                 }
1264                 goto unlock;
1265
1266         case ZFCP_ERP_CONTINUES:
1267                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1268                         --adapter->erp_low_mem_count;
1269                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1270                 }
1271                 goto unlock;
1272         }
1273
1274         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1275         zfcp_erp_action_dequeue(erp_action);
1276         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1277         if (retval == ZFCP_ERP_EXIT)
1278                 goto unlock;
1279         if (retval == ZFCP_ERP_SUCCEEDED)
1280                 zfcp_erp_strategy_followup_success(erp_action);
1281         if (retval == ZFCP_ERP_FAILED)
1282                 zfcp_erp_strategy_followup_failed(erp_action);
1283
1284  unlock:
1285         write_unlock_irqrestore(&adapter->erp_lock, flags);
1286
1287         if (retval != ZFCP_ERP_CONTINUES)
1288                 zfcp_erp_action_cleanup(erp_action, retval);
1289
1290         kref_put(&adapter->ref, zfcp_adapter_release);
1291         return retval;
1292 }
1293
1294 static int zfcp_erp_thread(void *data)
1295 {
1296         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1297         struct list_head *next;
1298         struct zfcp_erp_action *act;
1299         unsigned long flags;
1300
1301         for (;;) {
1302                 zfcp_dbf_rec_thread_lock("erthrd1", adapter->dbf);
1303                 wait_event_interruptible(adapter->erp_ready_wq,
1304                            !list_empty(&adapter->erp_ready_head) ||
1305                            kthread_should_stop());
1306                 zfcp_dbf_rec_thread_lock("erthrd2", adapter->dbf);
1307
1308                 if (kthread_should_stop())
1309                         break;
1310
1311                 write_lock_irqsave(&adapter->erp_lock, flags);
1312                 next = adapter->erp_ready_head.next;
1313                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1314
1315                 if (next != &adapter->erp_ready_head) {
1316                         act = list_entry(next, struct zfcp_erp_action, list);
1317
1318                         /* there is more to come after dismission, no notify */
1319                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1320                                 zfcp_erp_wakeup(adapter);
1321                 }
1322         }
1323
1324         return 0;
1325 }
1326
1327 /**
1328  * zfcp_erp_thread_setup - Start ERP thread for adapter
1329  * @adapter: Adapter to start the ERP thread for
1330  *
1331  * Returns 0 on success or error code from kernel_thread()
1332  */
1333 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1334 {
1335         struct task_struct *thread;
1336
1337         thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
1338                              dev_name(&adapter->ccw_device->dev));
1339         if (IS_ERR(thread)) {
1340                 dev_err(&adapter->ccw_device->dev,
1341                         "Creating an ERP thread for the FCP device failed.\n");
1342                 return PTR_ERR(thread);
1343         }
1344
1345         adapter->erp_thread = thread;
1346         return 0;
1347 }
1348
1349 /**
1350  * zfcp_erp_thread_kill - Stop ERP thread.
1351  * @adapter: Adapter where the ERP thread should be stopped.
1352  *
1353  * The caller of this routine ensures that the specified adapter has
1354  * been shut down and that this operation has been completed. Thus,
1355  * there are no pending erp_actions which would need to be handled
1356  * here.
1357  */
1358 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1359 {
1360         kthread_stop(adapter->erp_thread);
1361         adapter->erp_thread = NULL;
1362         WARN_ON(!list_empty(&adapter->erp_ready_head));
1363         WARN_ON(!list_empty(&adapter->erp_running_head));
1364 }
1365
1366 /**
1367  * zfcp_erp_adapter_failed - Set adapter status to failed.
1368  * @adapter: Failed adapter.
1369  * @id: Event id for debug trace.
1370  * @ref: Reference for debug trace.
1371  */
1372 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1373 {
1374         zfcp_erp_modify_adapter_status(adapter, id, ref,
1375                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1376 }
1377
1378 /**
1379  * zfcp_erp_port_failed - Set port status to failed.
1380  * @port: Failed port.
1381  * @id: Event id for debug trace.
1382  * @ref: Reference for debug trace.
1383  */
1384 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1385 {
1386         zfcp_erp_modify_port_status(port, id, ref,
1387                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1388 }
1389
1390 /**
1391  * zfcp_erp_unit_failed - Set unit status to failed.
1392  * @unit: Failed unit.
1393  * @id: Event id for debug trace.
1394  * @ref: Reference for debug trace.
1395  */
1396 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1397 {
1398         zfcp_erp_modify_unit_status(unit, id, ref,
1399                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1400 }
1401
1402 /**
1403  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1404  * @adapter: adapter for which to wait for completion of its error recovery
1405  */
1406 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1407 {
1408         wait_event(adapter->erp_done_wqh,
1409                    !(atomic_read(&adapter->status) &
1410                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1411 }
1412
1413 /**
1414  * zfcp_erp_modify_adapter_status - change adapter status bits
1415  * @adapter: adapter to change the status
1416  * @id: id for the debug trace
1417  * @ref: reference for the debug trace
1418  * @mask: status bits to change
1419  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1420  *
1421  * Changes in common status bits are propagated to attached ports and units.
1422  */
1423 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1424                                     void *ref, u32 mask, int set_or_clear)
1425 {
1426         struct zfcp_port *port;
1427         unsigned long flags;
1428         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1429
1430         if (set_or_clear == ZFCP_SET) {
1431                 if (status_change_set(mask, &adapter->status))
1432                         zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1433                 atomic_set_mask(mask, &adapter->status);
1434         } else {
1435                 if (status_change_clear(mask, &adapter->status))
1436                         zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1437                 atomic_clear_mask(mask, &adapter->status);
1438                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1439                         atomic_set(&adapter->erp_counter, 0);
1440         }
1441
1442         if (common_mask) {
1443                 read_lock_irqsave(&adapter->port_list_lock, flags);
1444                 list_for_each_entry(port, &adapter->port_list, list)
1445                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1446                                                     set_or_clear);
1447                 read_unlock_irqrestore(&adapter->port_list_lock, flags);
1448         }
1449 }
1450
1451 /**
1452  * zfcp_erp_modify_port_status - change port status bits
1453  * @port: port to change the status bits
1454  * @id: id for the debug trace
1455  * @ref: reference for the debug trace
1456  * @mask: status bits to change
1457  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1458  *
1459  * Changes in common status bits are propagated to attached units.
1460  */
1461 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1462                                  u32 mask, int set_or_clear)
1463 {
1464         struct zfcp_unit *unit;
1465         unsigned long flags;
1466         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1467
1468         if (set_or_clear == ZFCP_SET) {
1469                 if (status_change_set(mask, &port->status))
1470                         zfcp_dbf_rec_port(id, ref, port);
1471                 atomic_set_mask(mask, &port->status);
1472         } else {
1473                 if (status_change_clear(mask, &port->status))
1474                         zfcp_dbf_rec_port(id, ref, port);
1475                 atomic_clear_mask(mask, &port->status);
1476                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1477                         atomic_set(&port->erp_counter, 0);
1478         }
1479
1480         if (common_mask) {
1481                 read_lock_irqsave(&port->unit_list_lock, flags);
1482                 list_for_each_entry(unit, &port->unit_list, list)
1483                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1484                                                     set_or_clear);
1485                 read_unlock_irqrestore(&port->unit_list_lock, flags);
1486         }
1487 }
1488
1489 /**
1490  * zfcp_erp_modify_unit_status - change unit status bits
1491  * @unit: unit to change the status bits
1492  * @id: id for the debug trace
1493  * @ref: reference for the debug trace
1494  * @mask: status bits to change
1495  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1496  */
1497 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1498                                  u32 mask, int set_or_clear)
1499 {
1500         if (set_or_clear == ZFCP_SET) {
1501                 if (status_change_set(mask, &unit->status))
1502                         zfcp_dbf_rec_unit(id, ref, unit);
1503                 atomic_set_mask(mask, &unit->status);
1504         } else {
1505                 if (status_change_clear(mask, &unit->status))
1506                         zfcp_dbf_rec_unit(id, ref, unit);
1507                 atomic_clear_mask(mask, &unit->status);
1508                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1509                         atomic_set(&unit->erp_counter, 0);
1510                 }
1511         }
1512 }
1513
1514 /**
1515  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1516  * @port: The "boxed" port.
1517  * @id: The debug trace id.
1518  * @id: Reference for the debug trace.
1519  */
1520 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1521 {
1522         zfcp_erp_modify_port_status(port, id, ref,
1523                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1524         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1525 }
1526
1527 /**
1528  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1529  * @port: The "boxed" unit.
1530  * @id: The debug trace id.
1531  * @id: Reference for the debug trace.
1532  */
1533 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1534 {
1535         zfcp_erp_modify_unit_status(unit, id, ref,
1536                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1537         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1538 }
1539
1540 /**
1541  * zfcp_erp_port_access_denied - Adapter denied access to port.
1542  * @port: port where access has been denied
1543  * @id: id for debug trace
1544  * @ref: reference for debug trace
1545  *
1546  * Since the adapter has denied access, stop using the port and the
1547  * attached units.
1548  */
1549 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1550 {
1551         zfcp_erp_modify_port_status(port, id, ref,
1552                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1553                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1554 }
1555
1556 /**
1557  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1558  * @unit: unit where access has been denied
1559  * @id: id for debug trace
1560  * @ref: reference for debug trace
1561  *
1562  * Since the adapter has denied access, stop using the unit.
1563  */
1564 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1565 {
1566         zfcp_erp_modify_unit_status(unit, id, ref,
1567                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1568                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1569 }
1570
1571 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1572                                          void *ref)
1573 {
1574         int status = atomic_read(&unit->status);
1575         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1576                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1577                 return;
1578
1579         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1580 }
1581
1582 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1583                                          void *ref)
1584 {
1585         struct zfcp_unit *unit;
1586         unsigned long flags;
1587         int status = atomic_read(&port->status);
1588
1589         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1590                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1591                 read_lock_irqsave(&port->unit_list_lock, flags);
1592                 list_for_each_entry(unit, &port->unit_list, list)
1593                                     zfcp_erp_unit_access_changed(unit, id, ref);
1594                 read_unlock_irqrestore(&port->unit_list_lock, flags);
1595                 return;
1596         }
1597
1598         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1599 }
1600
1601 /**
1602  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1603  * @adapter: Adapter where the Access Control Table (ACT) changed
1604  * @id: Id for debug trace
1605  * @ref: Reference for debug trace
1606  */
1607 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1608                                      void *ref)
1609 {
1610         unsigned long flags;
1611         struct zfcp_port *port;
1612
1613         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1614                 return;
1615
1616         read_lock_irqsave(&adapter->port_list_lock, flags);
1617         list_for_each_entry(port, &adapter->port_list, list)
1618                 zfcp_erp_port_access_changed(port, id, ref);
1619         read_unlock_irqrestore(&adapter->port_list_lock, flags);
1620 }