SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/s390/scsi/zfcp_erp.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Error Recovery Procedures (ERP).
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/kthread.h>
  13 #include "zfcp_ext.h"
  14
  15 #define ZFCP_MAX_ERPS                   3
  16
  17 enum zfcp_erp_act_flags {
  18         ZFCP_STATUS_ERP_TIMEDOUT        = 0x10000000,
  19         ZFCP_STATUS_ERP_CLOSE_ONLY      = 0x01000000,
  20         ZFCP_STATUS_ERP_DISMISSING      = 0x00100000,
  21         ZFCP_STATUS_ERP_DISMISSED       = 0x00200000,
  22         ZFCP_STATUS_ERP_LOWMEM          = 0x00400000,
  23 };
  24
  25 enum zfcp_erp_steps {
  26         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
  27         ZFCP_ERP_STEP_FSF_XCONFIG       = 0x0001,
  28         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
  29         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
  30         ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
  31         ZFCP_ERP_STEP_UNIT_CLOSING      = 0x1000,
  32         ZFCP_ERP_STEP_UNIT_OPENING      = 0x2000,
  33 };
  34
  35 enum zfcp_erp_act_type {
  36         ZFCP_ERP_ACTION_REOPEN_UNIT        = 1,
  37         ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
  38         ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
  39         ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
  40 };
  41
  42 enum zfcp_erp_act_state {
  43         ZFCP_ERP_ACTION_RUNNING = 1,
  44         ZFCP_ERP_ACTION_READY   = 2,
  45 };
  46
  47 enum zfcp_erp_act_result {
  48         ZFCP_ERP_SUCCEEDED = 0,
  49         ZFCP_ERP_FAILED    = 1,
  50         ZFCP_ERP_CONTINUES = 2,
  51         ZFCP_ERP_EXIT      = 3,
  52         ZFCP_ERP_DISMISSED = 4,
  53         ZFCP_ERP_NOMEM     = 5,
  54 };
  55
  56 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
  57 {
  58         zfcp_erp_modify_adapter_status(adapter, "erablk1", NULL,
  59                                        ZFCP_STATUS_COMMON_UNBLOCKED | mask,
  60                                        ZFCP_CLEAR);
  61 }
  62
  63 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
  64 {
  65         struct zfcp_erp_action *curr_act;
  66
  67         list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
  68                 if (act == curr_act)
  69                         return ZFCP_ERP_ACTION_RUNNING;
  70         return 0;
  71 }
  72
  73 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
  74 {
  75         struct zfcp_adapter *adapter = act->adapter;
  76
  77         list_move(&act->list, &act->adapter->erp_ready_head);
  78         zfcp_dbf_rec_action("erardy1", act);
  79         wake_up(&adapter->erp_ready_wq);
  80         zfcp_dbf_rec_thread("erardy2", adapter->dbf);
  81 }
  82
  83 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
  84 {
  85         act->status |= ZFCP_STATUS_ERP_DISMISSED;
  86         if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
  87                 zfcp_erp_action_ready(act);
  88 }
  89
  90 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
  91 {
  92         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
  93                 zfcp_erp_action_dismiss(&unit->erp_action);
  94 }
  95
  96 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
  97 {
  98         struct zfcp_unit *unit;
  99
 100         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 101                 zfcp_erp_action_dismiss(&port->erp_action);
 102         else {
 103                 read_lock(&port->unit_list_lock);
 104                 list_for_each_entry(unit, &port->unit_list, list)
 105                         zfcp_erp_action_dismiss_unit(unit);
 106                 read_unlock(&port->unit_list_lock);
 107         }
 108 }
 109
 110 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 111 {
 112         struct zfcp_port *port;
 113
 114         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 115                 zfcp_erp_action_dismiss(&adapter->erp_action);
 116         else {
 117                 read_lock(&adapter->port_list_lock);
 118                 list_for_each_entry(port, &adapter->port_list, list)
 119                     zfcp_erp_action_dismiss_port(port);
 120                 read_unlock(&adapter->port_list_lock);
 121         }
 122 }
 123
 124 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 125                                  struct zfcp_port *port,
 126                                  struct zfcp_unit *unit)
 127 {
 128         int need = want;
 129         int u_status, p_status, a_status;
 130
 131         switch (want) {
 132         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 133                 u_status = atomic_read(&unit->status);
 134                 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 135                         return 0;
 136                 p_status = atomic_read(&port->status);
 137                 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
 138                       p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 139                         return 0;
 140                 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 141                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 142                 /* fall through */
 143         case ZFCP_ERP_ACTION_REOPEN_PORT:
 144         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 145                 p_status = atomic_read(&port->status);
 146                 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 147                         return 0;
 148                 a_status = atomic_read(&adapter->status);
 149                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
 150                       a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 151                         return 0;
 152                 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 153                         need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
 154                 /* fall through */
 155         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 156                 a_status = atomic_read(&adapter->status);
 157                 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 158                         return 0;
 159                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
 160                     !(a_status & ZFCP_STATUS_COMMON_OPEN))
 161                         return 0; /* shutdown requested for closed adapter */
 162         }
 163
 164         return need;
 165 }
 166
 167 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
 168                                                   struct zfcp_adapter *adapter,
 169                                                   struct zfcp_port *port,
 170                                                   struct zfcp_unit *unit)
 171 {
 172         struct zfcp_erp_action *erp_action;
 173         u32 status = 0;
 174
 175         switch (need) {
 176         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 177                 if (!get_device(&unit->sysfs_device))
 178                         return NULL;
 179                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
 180                 erp_action = &unit->erp_action;
 181                 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
 182                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 183                 break;
 184
 185         case ZFCP_ERP_ACTION_REOPEN_PORT:
 186         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 187                 if (!get_device(&port->sysfs_device))
 188                         return NULL;
 189                 zfcp_erp_action_dismiss_port(port);
 190                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
 191                 erp_action = &port->erp_action;
 192                 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
 193                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 194                 break;
 195
 196         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 197                 kref_get(&adapter->ref);
 198                 zfcp_erp_action_dismiss_adapter(adapter);
 199                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
 200                 erp_action = &adapter->erp_action;
 201                 if (!(atomic_read(&adapter->status) &
 202                       ZFCP_STATUS_COMMON_RUNNING))
 203                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 204                 break;
 205
 206         default:
 207                 return NULL;
 208         }
 209
 210         memset(erp_action, 0, sizeof(struct zfcp_erp_action));
 211         erp_action->adapter = adapter;
 212         erp_action->port = port;
 213         erp_action->unit = unit;
 214         erp_action->action = need;
 215         erp_action->status = status;
 216
 217         return erp_action;
 218 }
 219
 220 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 221                                    struct zfcp_port *port,
 222                                    struct zfcp_unit *unit, char *id, void *ref)
 223 {
 224         int retval = 1, need;
 225         struct zfcp_erp_action *act = NULL;
 226
 227         if (!adapter->erp_thread)
 228                 return -EIO;
 229
 230         need = zfcp_erp_required_act(want, adapter, port, unit);
 231         if (!need)
 232                 goto out;
 233
 234         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 235         act = zfcp_erp_setup_act(need, adapter, port, unit);
 236         if (!act)
 237                 goto out;
 238         ++adapter->erp_total_count;
 239         list_add_tail(&act->list, &adapter->erp_ready_head);
 240         wake_up(&adapter->erp_ready_wq);
 241         zfcp_dbf_rec_thread("eracte1", adapter->dbf);
 242         retval = 0;
 243  out:
 244         zfcp_dbf_rec_trigger(id, ref, want, need, act, adapter, port, unit);
 245         return retval;
 246 }
 247
 248 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 249                                     int clear_mask, char *id, void *ref)
 250 {
 251         zfcp_erp_adapter_block(adapter, clear_mask);
 252         zfcp_scsi_schedule_rports_block(adapter);
 253
 254         /* ensure propagation of failed status to new devices */
 255         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 256                 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
 257                 return -EIO;
 258         }
 259         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 260                                        adapter, NULL, NULL, id, ref);
 261 }
 262
 263 /**
 264  * zfcp_erp_adapter_reopen - Reopen adapter.
 265  * @adapter: Adapter to reopen.
 266  * @clear: Status flags to clear.
 267  * @id: Id for debug trace event.
 268  * @ref: Reference for debug trace event.
 269  */
 270 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
 271                              char *id, void *ref)
 272 {
 273         unsigned long flags;
 274
 275         zfcp_erp_adapter_block(adapter, clear);
 276         zfcp_scsi_schedule_rports_block(adapter);
 277
 278         write_lock_irqsave(&adapter->erp_lock, flags);
 279         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 280                 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
 281         else
 282                 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter,
 283                                         NULL, NULL, id, ref);
 284         write_unlock_irqrestore(&adapter->erp_lock, flags);
 285 }
 286
 287 /**
 288  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 289  * @adapter: Adapter 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_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 295                                char *id, void *ref)
 296 {
 297         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 298         zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
 299 }
 300
 301 /**
 302  * zfcp_erp_port_shutdown - Shutdown port
 303  * @port: Port 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_port_shutdown(struct zfcp_port *port, int clear, char *id,
 309                             void *ref)
 310 {
 311         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 312         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 313 }
 314
 315 /**
 316  * zfcp_erp_unit_shutdown - Shutdown unit
 317  * @unit: Unit to shut down.
 318  * @clear: Status flags to clear.
 319  * @id: Id for debug trace event.
 320  * @ref: Reference for debug trace event.
 321  */
 322 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
 323                             void *ref)
 324 {
 325         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 326         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 327 }
 328
 329 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 330 {
 331         zfcp_erp_modify_port_status(port, "erpblk1", NULL,
 332                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 333                                     ZFCP_CLEAR);
 334 }
 335
 336 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 337                                          int clear, char *id, void *ref)
 338 {
 339         zfcp_erp_port_block(port, clear);
 340         zfcp_scsi_schedule_rport_block(port);
 341
 342         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 343                 return;
 344
 345         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 346                                 port->adapter, port, NULL, id, ref);
 347 }
 348
 349 /**
 350  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 351  * @port: Port to force close and to reopen.
 352  * @id: Id for debug trace event.
 353  * @ref: Reference for debug trace event.
 354  */
 355 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id,
 356                                  void *ref)
 357 {
 358         unsigned long flags;
 359         struct zfcp_adapter *adapter = port->adapter;
 360
 361         write_lock_irqsave(&adapter->erp_lock, flags);
 362         _zfcp_erp_port_forced_reopen(port, clear, id, ref);
 363         write_unlock_irqrestore(&adapter->erp_lock, flags);
 364 }
 365
 366 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id,
 367                                  void *ref)
 368 {
 369         zfcp_erp_port_block(port, clear);
 370         zfcp_scsi_schedule_rport_block(port);
 371
 372         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 373                 /* ensure propagation of failed status to new devices */
 374                 zfcp_erp_port_failed(port, "erpreo1", NULL);
 375                 return -EIO;
 376         }
 377
 378         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 379                                        port->adapter, port, NULL, id, ref);
 380 }
 381
 382 /**
 383  * zfcp_erp_port_reopen - trigger remote port recovery
 384  * @port: port to recover
 385  * @clear_mask: flags in port status to be cleared
 386  *
 387  * Returns 0 if recovery has been triggered, < 0 if not.
 388  */
 389 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
 390 {
 391         int retval;
 392         unsigned long flags;
 393         struct zfcp_adapter *adapter = port->adapter;
 394
 395         write_lock_irqsave(&adapter->erp_lock, flags);
 396         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 397         write_unlock_irqrestore(&adapter->erp_lock, flags);
 398
 399         return retval;
 400 }
 401
 402 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 403 {
 404         zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
 405                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 406                                     ZFCP_CLEAR);
 407 }
 408
 409 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 410                                   void *ref)
 411 {
 412         struct zfcp_adapter *adapter = unit->port->adapter;
 413
 414         zfcp_erp_unit_block(unit, clear);
 415
 416         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 417                 return;
 418
 419         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 420                                 adapter, unit->port, unit, id, ref);
 421 }
 422
 423 /**
 424  * zfcp_erp_unit_reopen - initiate reopen of a unit
 425  * @unit: unit to be reopened
 426  * @clear_mask: specifies flags in unit status to be cleared
 427  * Return: 0 on success, < 0 on error
 428  */
 429 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 430                           void *ref)
 431 {
 432         unsigned long flags;
 433         struct zfcp_port *port = unit->port;
 434         struct zfcp_adapter *adapter = port->adapter;
 435
 436         write_lock_irqsave(&adapter->erp_lock, flags);
 437         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 438         write_unlock_irqrestore(&adapter->erp_lock, flags);
 439 }
 440
 441 static int status_change_set(unsigned long mask, atomic_t *status)
 442 {
 443         return (atomic_read(status) ^ mask) & mask;
 444 }
 445
 446 static int status_change_clear(unsigned long mask, atomic_t *status)
 447 {
 448         return atomic_read(status) & mask;
 449 }
 450
 451 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 452 {
 453         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 454                 zfcp_dbf_rec_adapter("eraubl1", NULL, adapter->dbf);
 455         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 456 }
 457
 458 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 459 {
 460         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 461                 zfcp_dbf_rec_port("erpubl1", NULL, port);
 462         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 463 }
 464
 465 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 466 {
 467         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 468                 zfcp_dbf_rec_unit("eruubl1", NULL, unit);
 469         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 470 }
 471
 472 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 473 {
 474         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 475         zfcp_dbf_rec_action("erator1", erp_action);
 476 }
 477
 478 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 479 {
 480         struct zfcp_adapter *adapter = act->adapter;
 481
 482         if (!act->fsf_req)
 483                 return;
 484
 485         spin_lock(&adapter->req_list_lock);
 486         if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
 487             act->fsf_req->erp_action == act) {
 488                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 489                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 490                         act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 491                         zfcp_dbf_rec_action("erscf_1", act);
 492                         act->fsf_req->erp_action = NULL;
 493                 }
 494                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 495                         zfcp_dbf_rec_action("erscf_2", act);
 496                 if (act->fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
 497                         act->fsf_req = NULL;
 498         } else
 499                 act->fsf_req = NULL;
 500         spin_unlock(&adapter->req_list_lock);
 501 }
 502
 503 /**
 504  * zfcp_erp_notify - Trigger ERP action.
 505  * @erp_action: ERP action to continue.
 506  * @set_mask: ERP action status flags to set.
 507  */
 508 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 509 {
 510         struct zfcp_adapter *adapter = erp_action->adapter;
 511         unsigned long flags;
 512
 513         write_lock_irqsave(&adapter->erp_lock, flags);
 514         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 515                 erp_action->status |= set_mask;
 516                 zfcp_erp_action_ready(erp_action);
 517         }
 518         write_unlock_irqrestore(&adapter->erp_lock, flags);
 519 }
 520
 521 /**
 522  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 523  * @data: ERP action (from timer data)
 524  */
 525 void zfcp_erp_timeout_handler(unsigned long data)
 526 {
 527         struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
 528         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 529 }
 530
 531 static void zfcp_erp_memwait_handler(unsigned long data)
 532 {
 533         zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
 534 }
 535
 536 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 537 {
 538         init_timer(&erp_action->timer);
 539         erp_action->timer.function = zfcp_erp_memwait_handler;
 540         erp_action->timer.data = (unsigned long) erp_action;
 541         erp_action->timer.expires = jiffies + HZ;
 542         add_timer(&erp_action->timer);
 543 }
 544
 545 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 546                                       int clear, char *id, void *ref)
 547 {
 548         struct zfcp_port *port;
 549
 550         read_lock(&adapter->port_list_lock);
 551         list_for_each_entry(port, &adapter->port_list, list)
 552                 _zfcp_erp_port_reopen(port, clear, id, ref);
 553         read_unlock(&adapter->port_list_lock);
 554 }
 555
 556 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
 557                                       char *id, void *ref)
 558 {
 559         struct zfcp_unit *unit;
 560
 561         read_lock(&port->unit_list_lock);
 562         list_for_each_entry(unit, &port->unit_list, list)
 563                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 564         read_unlock(&port->unit_list_lock);
 565 }
 566
 567 static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
 568 {
 569         switch (act->action) {
 570         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 571                 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1", NULL);
 572                 break;
 573         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 574                 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2", NULL);
 575                 break;
 576         case ZFCP_ERP_ACTION_REOPEN_PORT:
 577                 _zfcp_erp_port_reopen(act->port, 0, "ersff_3", NULL);
 578                 break;
 579         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 580                 _zfcp_erp_unit_reopen(act->unit, 0, "ersff_4", NULL);
 581                 break;
 582         }
 583 }
 584
 585 static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
 586 {
 587         switch (act->action) {
 588         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 589                 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1", NULL);
 590                 break;
 591         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 592                 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2", NULL);
 593                 break;
 594         case ZFCP_ERP_ACTION_REOPEN_PORT:
 595                 _zfcp_erp_unit_reopen_all(act->port, 0, "ersfs_3", NULL);
 596                 break;
 597         }
 598 }
 599
 600 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 601 {
 602         unsigned long flags;
 603
 604         read_lock_irqsave(&adapter->erp_lock, flags);
 605         if (list_empty(&adapter->erp_ready_head) &&
 606             list_empty(&adapter->erp_running_head)) {
 607                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 608                                           &adapter->status);
 609                         wake_up(&adapter->erp_done_wqh);
 610         }
 611         read_unlock_irqrestore(&adapter->erp_lock, flags);
 612 }
 613
 614 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 615 {
 616         struct zfcp_qdio *qdio = act->adapter->qdio;
 617
 618         if (zfcp_qdio_open(qdio))
 619                 return ZFCP_ERP_FAILED;
 620         init_waitqueue_head(&qdio->req_q_wq);
 621         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 622         return ZFCP_ERP_SUCCEEDED;
 623 }
 624
 625 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 626 {
 627         struct zfcp_port *port;
 628         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 629                                  adapter->peer_d_id);
 630         if (IS_ERR(port)) /* error or port already attached */
 631                 return;
 632         _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
 633 }
 634
 635 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 636 {
 637         int retries;
 638         int sleep = 1;
 639         struct zfcp_adapter *adapter = erp_action->adapter;
 640
 641         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 642
 643         for (retries = 7; retries; retries--) {
 644                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 645                                   &adapter->status);
 646                 write_lock_irq(&adapter->erp_lock);
 647                 zfcp_erp_action_to_running(erp_action);
 648                 write_unlock_irq(&adapter->erp_lock);
 649                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 650                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 651                                           &adapter->status);
 652                         return ZFCP_ERP_FAILED;
 653                 }
 654
 655                 zfcp_dbf_rec_thread_lock("erasfx1", adapter->dbf);
 656                 wait_event(adapter->erp_ready_wq,
 657                            !list_empty(&adapter->erp_ready_head));
 658                 zfcp_dbf_rec_thread_lock("erasfx2", adapter->dbf);
 659                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 660                         break;
 661
 662                 if (!(atomic_read(&adapter->status) &
 663                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 664                         break;
 665
 666                 ssleep(sleep);
 667                 sleep *= 2;
 668         }
 669
 670         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 671                           &adapter->status);
 672
 673         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 674                 return ZFCP_ERP_FAILED;
 675
 676         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 677                 zfcp_erp_enqueue_ptp_port(adapter);
 678
 679         return ZFCP_ERP_SUCCEEDED;
 680 }
 681
 682 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 683 {
 684         int ret;
 685         struct zfcp_adapter *adapter = act->adapter;
 686
 687         write_lock_irq(&adapter->erp_lock);
 688         zfcp_erp_action_to_running(act);
 689         write_unlock_irq(&adapter->erp_lock);
 690
 691         ret = zfcp_fsf_exchange_port_data(act);
 692         if (ret == -EOPNOTSUPP)
 693                 return ZFCP_ERP_SUCCEEDED;
 694         if (ret)
 695                 return ZFCP_ERP_FAILED;
 696
 697         zfcp_dbf_rec_thread_lock("erasox1", adapter->dbf);
 698         wait_event(adapter->erp_ready_wq,
 699                    !list_empty(&adapter->erp_ready_head));
 700         zfcp_dbf_rec_thread_lock("erasox2", adapter->dbf);
 701         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 702                 return ZFCP_ERP_FAILED;
 703
 704         return ZFCP_ERP_SUCCEEDED;
 705 }
 706
 707 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 708 {
 709         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 710                 return ZFCP_ERP_FAILED;
 711
 712         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 713                 return ZFCP_ERP_FAILED;
 714
 715         atomic_set(&act->adapter->stat_miss, 16);
 716         if (zfcp_status_read_refill(act->adapter))
 717                 return ZFCP_ERP_FAILED;
 718
 719         return ZFCP_ERP_SUCCEEDED;
 720 }
 721
 722 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 723 {
 724         struct zfcp_adapter *adapter = act->adapter;
 725
 726         /* close queues to ensure that buffers are not accessed by adapter */
 727         zfcp_qdio_close(adapter->qdio);
 728         zfcp_fsf_req_dismiss_all(adapter);
 729         adapter->fsf_req_seq_no = 0;
 730         zfcp_fc_wka_ports_force_offline(adapter->gs);
 731         /* all ports and units are closed */
 732         zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
 733                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 734
 735         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 736                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 737 }
 738
 739 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
 740 {
 741         struct zfcp_adapter *adapter = act->adapter;
 742
 743         if (zfcp_erp_adapter_strategy_open_qdio(act)) {
 744                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 745                                   ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 746                                   &adapter->status);
 747                 return ZFCP_ERP_FAILED;
 748         }
 749
 750         if (zfcp_erp_adapter_strategy_open_fsf(act)) {
 751                 zfcp_erp_adapter_strategy_close(act);
 752                 return ZFCP_ERP_FAILED;
 753         }
 754
 755         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
 756
 757         return ZFCP_ERP_SUCCEEDED;
 758 }
 759
 760 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 761 {
 762         struct zfcp_adapter *adapter = act->adapter;
 763
 764         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
 765                 zfcp_erp_adapter_strategy_close(act);
 766                 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 767                         return ZFCP_ERP_EXIT;
 768         }
 769
 770         if (zfcp_erp_adapter_strategy_open(act)) {
 771                 ssleep(8);
 772                 return ZFCP_ERP_FAILED;
 773         }
 774
 775         return ZFCP_ERP_SUCCEEDED;
 776 }
 777
 778 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 779 {
 780         int retval;
 781
 782         retval = zfcp_fsf_close_physical_port(act);
 783         if (retval == -ENOMEM)
 784                 return ZFCP_ERP_NOMEM;
 785         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 786         if (retval)
 787                 return ZFCP_ERP_FAILED;
 788
 789         return ZFCP_ERP_CONTINUES;
 790 }
 791
 792 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 793 {
 794         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
 795 }
 796
 797 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 798 {
 799         struct zfcp_port *port = erp_action->port;
 800         int status = atomic_read(&port->status);
 801
 802         switch (erp_action->step) {
 803         case ZFCP_ERP_STEP_UNINITIALIZED:
 804                 zfcp_erp_port_strategy_clearstati(port);
 805                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 806                     (status & ZFCP_STATUS_COMMON_OPEN))
 807                         return zfcp_erp_port_forced_strategy_close(erp_action);
 808                 else
 809                         return ZFCP_ERP_FAILED;
 810
 811         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 812                 if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
 813                         return ZFCP_ERP_SUCCEEDED;
 814         }
 815         return ZFCP_ERP_FAILED;
 816 }
 817
 818 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 819 {
 820         int retval;
 821
 822         retval = zfcp_fsf_close_port(erp_action);
 823         if (retval == -ENOMEM)
 824                 return ZFCP_ERP_NOMEM;
 825         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 826         if (retval)
 827                 return ZFCP_ERP_FAILED;
 828         return ZFCP_ERP_CONTINUES;
 829 }
 830
 831 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 832 {
 833         int retval;
 834
 835         retval = zfcp_fsf_open_port(erp_action);
 836         if (retval == -ENOMEM)
 837                 return ZFCP_ERP_NOMEM;
 838         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 839         if (retval)
 840                 return ZFCP_ERP_FAILED;
 841         return ZFCP_ERP_CONTINUES;
 842 }
 843
 844 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 845 {
 846         struct zfcp_adapter *adapter = act->adapter;
 847         struct zfcp_port *port = act->port;
 848
 849         if (port->wwpn != adapter->peer_wwpn) {
 850                 zfcp_erp_port_failed(port, "eroptp1", NULL);
 851                 return ZFCP_ERP_FAILED;
 852         }
 853         port->d_id = adapter->peer_d_id;
 854         return zfcp_erp_port_strategy_open_port(act);
 855 }
 856
 857 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 858 {
 859         struct zfcp_adapter *adapter = act->adapter;
 860         struct zfcp_port *port = act->port;
 861         int p_status = atomic_read(&port->status);
 862
 863         switch (act->step) {
 864         case ZFCP_ERP_STEP_UNINITIALIZED:
 865         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 866         case ZFCP_ERP_STEP_PORT_CLOSING:
 867                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 868                         return zfcp_erp_open_ptp_port(act);
 869                 if (!port->d_id) {
 870                         zfcp_fc_trigger_did_lookup(port);
 871                         return ZFCP_ERP_EXIT;
 872                 }
 873                 return zfcp_erp_port_strategy_open_port(act);
 874
 875         case ZFCP_ERP_STEP_PORT_OPENING:
 876                 /* D_ID might have changed during open */
 877                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 878                         if (!port->d_id) {
 879                                 zfcp_fc_trigger_did_lookup(port);
 880                                 return ZFCP_ERP_EXIT;
 881                         }
 882                         return ZFCP_ERP_SUCCEEDED;
 883                 }
 884                 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
 885                         port->d_id = 0;
 886                         _zfcp_erp_port_reopen(port, 0, "erpsoc1", NULL);
 887                         return ZFCP_ERP_EXIT;
 888                 }
 889                 /* fall through otherwise */
 890         }
 891         return ZFCP_ERP_FAILED;
 892 }
 893
 894 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 895 {
 896         struct zfcp_port *port = erp_action->port;
 897         int p_status = atomic_read(&port->status);
 898
 899         if ((p_status & ZFCP_STATUS_COMMON_NOESC) &&
 900             !(p_status & ZFCP_STATUS_COMMON_OPEN))
 901                 goto close_init_done;
 902
 903         switch (erp_action->step) {
 904         case ZFCP_ERP_STEP_UNINITIALIZED:
 905                 zfcp_erp_port_strategy_clearstati(port);
 906                 if (p_status & ZFCP_STATUS_COMMON_OPEN)
 907                         return zfcp_erp_port_strategy_close(erp_action);
 908                 break;
 909
 910         case ZFCP_ERP_STEP_PORT_CLOSING:
 911                 if (p_status & ZFCP_STATUS_COMMON_OPEN)
 912                         return ZFCP_ERP_FAILED;
 913                 break;
 914         }
 915
 916 close_init_done:
 917         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 918                 return ZFCP_ERP_EXIT;
 919
 920         return zfcp_erp_port_strategy_open_common(erp_action);
 921 }
 922
 923 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 924 {
 925         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 926                           ZFCP_STATUS_UNIT_SHARED |
 927                           ZFCP_STATUS_UNIT_READONLY,
 928                           &unit->status);
 929 }
 930
 931 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 932 {
 933         int retval = zfcp_fsf_close_unit(erp_action);
 934         if (retval == -ENOMEM)
 935                 return ZFCP_ERP_NOMEM;
 936         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 937         if (retval)
 938                 return ZFCP_ERP_FAILED;
 939         return ZFCP_ERP_CONTINUES;
 940 }
 941
 942 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 943 {
 944         int retval = zfcp_fsf_open_unit(erp_action);
 945         if (retval == -ENOMEM)
 946                 return ZFCP_ERP_NOMEM;
 947         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 948         if (retval)
 949                 return  ZFCP_ERP_FAILED;
 950         return ZFCP_ERP_CONTINUES;
 951 }
 952
 953 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 954 {
 955         struct zfcp_unit *unit = erp_action->unit;
 956
 957         switch (erp_action->step) {
 958         case ZFCP_ERP_STEP_UNINITIALIZED:
 959                 zfcp_erp_unit_strategy_clearstati(unit);
 960                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 961                         return zfcp_erp_unit_strategy_close(erp_action);
 962                 /* already closed, fall through */
 963         case ZFCP_ERP_STEP_UNIT_CLOSING:
 964                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 965                         return ZFCP_ERP_FAILED;
 966                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 967                         return ZFCP_ERP_EXIT;
 968                 return zfcp_erp_unit_strategy_open(erp_action);
 969
 970         case ZFCP_ERP_STEP_UNIT_OPENING:
 971                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 972                         return ZFCP_ERP_SUCCEEDED;
 973         }
 974         return ZFCP_ERP_FAILED;
 975 }
 976
 977 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 978 {
 979         switch (result) {
 980         case ZFCP_ERP_SUCCEEDED :
 981                 atomic_set(&unit->erp_counter, 0);
 982                 zfcp_erp_unit_unblock(unit);
 983                 break;
 984         case ZFCP_ERP_FAILED :
 985                 atomic_inc(&unit->erp_counter);
 986                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
 987                         dev_err(&unit->port->adapter->ccw_device->dev,
 988                                 "ERP failed for unit 0x%016Lx on "
 989                                 "port 0x%016Lx\n",
 990                                 (unsigned long long)unit->fcp_lun,
 991                                 (unsigned long long)unit->port->wwpn);
 992                         zfcp_erp_unit_failed(unit, "erusck1", NULL);
 993                 }
 994                 break;
 995         }
 996
 997         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 998                 zfcp_erp_unit_block(unit, 0);
 999                 result = ZFCP_ERP_EXIT;
1000         }
1001         return result;
1002 }
1003
1004 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1005 {
1006         switch (result) {
1007         case ZFCP_ERP_SUCCEEDED :
1008                 atomic_set(&port->erp_counter, 0);
1009                 zfcp_erp_port_unblock(port);
1010                 break;
1011
1012         case ZFCP_ERP_FAILED :
1013                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1014                         zfcp_erp_port_block(port, 0);
1015                         result = ZFCP_ERP_EXIT;
1016                 }
1017                 atomic_inc(&port->erp_counter);
1018                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1019                         dev_err(&port->adapter->ccw_device->dev,
1020                                 "ERP failed for remote port 0x%016Lx\n",
1021                                 (unsigned long long)port->wwpn);
1022                         zfcp_erp_port_failed(port, "erpsck1", NULL);
1023                 }
1024                 break;
1025         }
1026
1027         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1028                 zfcp_erp_port_block(port, 0);
1029                 result = ZFCP_ERP_EXIT;
1030         }
1031         return result;
1032 }
1033
1034 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1035                                            int result)
1036 {
1037         switch (result) {
1038         case ZFCP_ERP_SUCCEEDED :
1039                 atomic_set(&adapter->erp_counter, 0);
1040                 zfcp_erp_adapter_unblock(adapter);
1041                 break;
1042
1043         case ZFCP_ERP_FAILED :
1044                 atomic_inc(&adapter->erp_counter);
1045                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1046                         dev_err(&adapter->ccw_device->dev,
1047                                 "ERP cannot recover an error "
1048                                 "on the FCP device\n");
1049                         zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1050                 }
1051                 break;
1052         }
1053
1054         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1055                 zfcp_erp_adapter_block(adapter, 0);
1056                 result = ZFCP_ERP_EXIT;
1057         }
1058         return result;
1059 }
1060
1061 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1062                                           int result)
1063 {
1064         struct zfcp_adapter *adapter = erp_action->adapter;
1065         struct zfcp_port *port = erp_action->port;
1066         struct zfcp_unit *unit = erp_action->unit;
1067
1068         switch (erp_action->action) {
1069
1070         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1071                 result = zfcp_erp_strategy_check_unit(unit, result);
1072                 break;
1073
1074         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1075         case ZFCP_ERP_ACTION_REOPEN_PORT:
1076                 result = zfcp_erp_strategy_check_port(port, result);
1077                 break;
1078
1079         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1080                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1081                 break;
1082         }
1083         return result;
1084 }
1085
1086 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1087 {
1088         int status = atomic_read(target_status);
1089
1090         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1091             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1092                 return 1; /* take it online */
1093
1094         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1095             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1096                 return 1; /* take it offline */
1097
1098         return 0;
1099 }
1100
1101 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1102 {
1103         int action = act->action;
1104         struct zfcp_adapter *adapter = act->adapter;
1105         struct zfcp_port *port = act->port;
1106         struct zfcp_unit *unit = act->unit;
1107         u32 erp_status = act->status;
1108
1109         switch (action) {
1110         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1111                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1112                         _zfcp_erp_adapter_reopen(adapter,
1113                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1114                                                  "ersscg1", NULL);
1115                         return ZFCP_ERP_EXIT;
1116                 }
1117                 break;
1118
1119         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1120         case ZFCP_ERP_ACTION_REOPEN_PORT:
1121                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1122                         _zfcp_erp_port_reopen(port,
1123                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1124                                               "ersscg2", NULL);
1125                         return ZFCP_ERP_EXIT;
1126                 }
1127                 break;
1128
1129         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1130                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1131                         _zfcp_erp_unit_reopen(unit,
1132                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1133                                               "ersscg3", NULL);
1134                         return ZFCP_ERP_EXIT;
1135                 }
1136                 break;
1137         }
1138         return ret;
1139 }
1140
1141 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1142 {
1143         struct zfcp_adapter *adapter = erp_action->adapter;
1144
1145         adapter->erp_total_count--;
1146         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1147                 adapter->erp_low_mem_count--;
1148                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1149         }
1150
1151         list_del(&erp_action->list);
1152         zfcp_dbf_rec_action("eractd1", erp_action);
1153
1154         switch (erp_action->action) {
1155         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1156                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1157                                   &erp_action->unit->status);
1158                 break;
1159
1160         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1161         case ZFCP_ERP_ACTION_REOPEN_PORT:
1162                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1163                                   &erp_action->port->status);
1164                 break;
1165
1166         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1167                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1168                                   &erp_action->adapter->status);
1169                 break;
1170         }
1171 }
1172
1173 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1174 {
1175         struct zfcp_adapter *adapter = act->adapter;
1176         struct zfcp_port *port = act->port;
1177         struct zfcp_unit *unit = act->unit;
1178
1179         switch (act->action) {
1180         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1181                 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1182                         get_device(&unit->sysfs_device);
1183                         if (scsi_queue_work(unit->port->adapter->scsi_host,
1184                                             &unit->scsi_work) <= 0)
1185                                 put_device(&unit->sysfs_device);
1186                 }
1187                 put_device(&unit->sysfs_device);
1188                 break;
1189
1190         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1191         case ZFCP_ERP_ACTION_REOPEN_PORT:
1192                 if (result == ZFCP_ERP_SUCCEEDED)
1193                         zfcp_scsi_schedule_rport_register(port);
1194                 put_device(&port->sysfs_device);
1195                 break;
1196
1197         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1198                 if (result == ZFCP_ERP_SUCCEEDED) {
1199                         register_service_level(&adapter->service_level);
1200                         queue_work(adapter->work_queue, &adapter->scan_work);
1201                 } else
1202                         unregister_service_level(&adapter->service_level);
1203                 kref_put(&adapter->ref, zfcp_adapter_release);
1204                 break;
1205         }
1206 }
1207
1208 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1209 {
1210         switch (erp_action->action) {
1211         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1212                 return zfcp_erp_adapter_strategy(erp_action);
1213         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1214                 return zfcp_erp_port_forced_strategy(erp_action);
1215         case ZFCP_ERP_ACTION_REOPEN_PORT:
1216                 return zfcp_erp_port_strategy(erp_action);
1217         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1218                 return zfcp_erp_unit_strategy(erp_action);
1219         }
1220         return ZFCP_ERP_FAILED;
1221 }
1222
1223 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1224 {
1225         int retval;
1226         unsigned long flags;
1227         struct zfcp_adapter *adapter = erp_action->adapter;
1228
1229         kref_get(&adapter->ref);
1230
1231         write_lock_irqsave(&adapter->erp_lock, flags);
1232         zfcp_erp_strategy_check_fsfreq(erp_action);
1233
1234         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1235                 zfcp_erp_action_dequeue(erp_action);
1236                 retval = ZFCP_ERP_DISMISSED;
1237                 goto unlock;
1238         }
1239
1240         zfcp_erp_action_to_running(erp_action);
1241
1242         /* no lock to allow for blocking operations */
1243         write_unlock_irqrestore(&adapter->erp_lock, flags);
1244         retval = zfcp_erp_strategy_do_action(erp_action);
1245         write_lock_irqsave(&adapter->erp_lock, flags);
1246
1247         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1248                 retval = ZFCP_ERP_CONTINUES;
1249
1250         switch (retval) {
1251         case ZFCP_ERP_NOMEM:
1252                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1253                         ++adapter->erp_low_mem_count;
1254                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1255                 }
1256                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1257                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1258                 else {
1259                         zfcp_erp_strategy_memwait(erp_action);
1260                         retval = ZFCP_ERP_CONTINUES;
1261                 }
1262                 goto unlock;
1263
1264         case ZFCP_ERP_CONTINUES:
1265                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1266                         --adapter->erp_low_mem_count;
1267                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1268                 }
1269                 goto unlock;
1270         }
1271
1272         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1273         zfcp_erp_action_dequeue(erp_action);
1274         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1275         if (retval == ZFCP_ERP_EXIT)
1276                 goto unlock;
1277         if (retval == ZFCP_ERP_SUCCEEDED)
1278                 zfcp_erp_strategy_followup_success(erp_action);
1279         if (retval == ZFCP_ERP_FAILED)
1280                 zfcp_erp_strategy_followup_failed(erp_action);
1281
1282  unlock:
1283         write_unlock_irqrestore(&adapter->erp_lock, flags);
1284
1285         if (retval != ZFCP_ERP_CONTINUES)
1286                 zfcp_erp_action_cleanup(erp_action, retval);
1287
1288         kref_put(&adapter->ref, zfcp_adapter_release);
1289         return retval;
1290 }
1291
1292 static int zfcp_erp_thread(void *data)
1293 {
1294         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1295         struct list_head *next;
1296         struct zfcp_erp_action *act;
1297         unsigned long flags;
1298
1299         for (;;) {
1300                 zfcp_dbf_rec_thread_lock("erthrd1", adapter->dbf);
1301                 wait_event_interruptible(adapter->erp_ready_wq,
1302                            !list_empty(&adapter->erp_ready_head) ||
1303                            kthread_should_stop());
1304                 zfcp_dbf_rec_thread_lock("erthrd2", adapter->dbf);
1305
1306                 if (kthread_should_stop())
1307                         break;
1308
1309                 write_lock_irqsave(&adapter->erp_lock, flags);
1310                 next = adapter->erp_ready_head.next;
1311                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1312
1313                 if (next != &adapter->erp_ready_head) {
1314                         act = list_entry(next, struct zfcp_erp_action, list);
1315
1316                         /* there is more to come after dismission, no notify */
1317                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1318                                 zfcp_erp_wakeup(adapter);
1319                 }
1320         }
1321
1322         return 0;
1323 }
1324
1325 /**
1326  * zfcp_erp_thread_setup - Start ERP thread for adapter
1327  * @adapter: Adapter to start the ERP thread for
1328  *
1329  * Returns 0 on success or error code from kernel_thread()
1330  */
1331 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1332 {
1333         struct task_struct *thread;
1334
1335         thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
1336                              dev_name(&adapter->ccw_device->dev));
1337         if (IS_ERR(thread)) {
1338                 dev_err(&adapter->ccw_device->dev,
1339                         "Creating an ERP thread for the FCP device failed.\n");
1340                 return PTR_ERR(thread);
1341         }
1342
1343         adapter->erp_thread = thread;
1344         return 0;
1345 }
1346
1347 /**
1348  * zfcp_erp_thread_kill - Stop ERP thread.
1349  * @adapter: Adapter where the ERP thread should be stopped.
1350  *
1351  * The caller of this routine ensures that the specified adapter has
1352  * been shut down and that this operation has been completed. Thus,
1353  * there are no pending erp_actions which would need to be handled
1354  * here.
1355  */
1356 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1357 {
1358         kthread_stop(adapter->erp_thread);
1359         adapter->erp_thread = NULL;
1360         WARN_ON(!list_empty(&adapter->erp_ready_head));
1361         WARN_ON(!list_empty(&adapter->erp_running_head));
1362 }
1363
1364 /**
1365  * zfcp_erp_adapter_failed - Set adapter status to failed.
1366  * @adapter: Failed adapter.
1367  * @id: Event id for debug trace.
1368  * @ref: Reference for debug trace.
1369  */
1370 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1371 {
1372         zfcp_erp_modify_adapter_status(adapter, id, ref,
1373                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1374 }
1375
1376 /**
1377  * zfcp_erp_port_failed - Set port status to failed.
1378  * @port: Failed port.
1379  * @id: Event id for debug trace.
1380  * @ref: Reference for debug trace.
1381  */
1382 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1383 {
1384         zfcp_erp_modify_port_status(port, id, ref,
1385                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1386 }
1387
1388 /**
1389  * zfcp_erp_unit_failed - Set unit status to failed.
1390  * @unit: Failed unit.
1391  * @id: Event id for debug trace.
1392  * @ref: Reference for debug trace.
1393  */
1394 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1395 {
1396         zfcp_erp_modify_unit_status(unit, id, ref,
1397                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1398 }
1399
1400 /**
1401  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1402  * @adapter: adapter for which to wait for completion of its error recovery
1403  */
1404 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1405 {
1406         wait_event(adapter->erp_done_wqh,
1407                    !(atomic_read(&adapter->status) &
1408                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1409 }
1410
1411 /**
1412  * zfcp_erp_modify_adapter_status - change adapter status bits
1413  * @adapter: adapter to change the status
1414  * @id: id for the debug trace
1415  * @ref: reference for the debug trace
1416  * @mask: status bits to change
1417  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1418  *
1419  * Changes in common status bits are propagated to attached ports and units.
1420  */
1421 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1422                                     void *ref, u32 mask, int set_or_clear)
1423 {
1424         struct zfcp_port *port;
1425         unsigned long flags;
1426         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1427
1428         if (set_or_clear == ZFCP_SET) {
1429                 if (status_change_set(mask, &adapter->status))
1430                         zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1431                 atomic_set_mask(mask, &adapter->status);
1432         } else {
1433                 if (status_change_clear(mask, &adapter->status))
1434                         zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1435                 atomic_clear_mask(mask, &adapter->status);
1436                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1437                         atomic_set(&adapter->erp_counter, 0);
1438         }
1439
1440         if (common_mask) {
1441                 read_lock_irqsave(&adapter->port_list_lock, flags);
1442                 list_for_each_entry(port, &adapter->port_list, list)
1443                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1444                                                     set_or_clear);
1445                 read_unlock_irqrestore(&adapter->port_list_lock, flags);
1446         }
1447 }
1448
1449 /**
1450  * zfcp_erp_modify_port_status - change port status bits
1451  * @port: port to change the status bits
1452  * @id: id for the debug trace
1453  * @ref: reference for the debug trace
1454  * @mask: status bits to change
1455  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1456  *
1457  * Changes in common status bits are propagated to attached units.
1458  */
1459 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1460                                  u32 mask, int set_or_clear)
1461 {
1462         struct zfcp_unit *unit;
1463         unsigned long flags;
1464         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1465
1466         if (set_or_clear == ZFCP_SET) {
1467                 if (status_change_set(mask, &port->status))
1468                         zfcp_dbf_rec_port(id, ref, port);
1469                 atomic_set_mask(mask, &port->status);
1470         } else {
1471                 if (status_change_clear(mask, &port->status))
1472                         zfcp_dbf_rec_port(id, ref, port);
1473                 atomic_clear_mask(mask, &port->status);
1474                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1475                         atomic_set(&port->erp_counter, 0);
1476         }
1477
1478         if (common_mask) {
1479                 read_lock_irqsave(&port->unit_list_lock, flags);
1480                 list_for_each_entry(unit, &port->unit_list, list)
1481                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1482                                                     set_or_clear);
1483                 read_unlock_irqrestore(&port->unit_list_lock, flags);
1484         }
1485 }
1486
1487 /**
1488  * zfcp_erp_modify_unit_status - change unit status bits
1489  * @unit: unit to change the status bits
1490  * @id: id for the debug trace
1491  * @ref: reference for the debug trace
1492  * @mask: status bits to change
1493  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1494  */
1495 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1496                                  u32 mask, int set_or_clear)
1497 {
1498         if (set_or_clear == ZFCP_SET) {
1499                 if (status_change_set(mask, &unit->status))
1500                         zfcp_dbf_rec_unit(id, ref, unit);
1501                 atomic_set_mask(mask, &unit->status);
1502         } else {
1503                 if (status_change_clear(mask, &unit->status))
1504                         zfcp_dbf_rec_unit(id, ref, unit);
1505                 atomic_clear_mask(mask, &unit->status);
1506                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1507                         atomic_set(&unit->erp_counter, 0);
1508                 }
1509         }
1510 }
1511
1512 /**
1513  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1514  * @port: The "boxed" port.
1515  * @id: The debug trace id.
1516  * @id: Reference for the debug trace.
1517  */
1518 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1519 {
1520         zfcp_erp_modify_port_status(port, id, ref,
1521                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1522         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1523 }
1524
1525 /**
1526  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1527  * @port: The "boxed" unit.
1528  * @id: The debug trace id.
1529  * @id: Reference for the debug trace.
1530  */
1531 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1532 {
1533         zfcp_erp_modify_unit_status(unit, id, ref,
1534                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1535         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1536 }
1537
1538 /**
1539  * zfcp_erp_port_access_denied - Adapter denied access to port.
1540  * @port: port where access has been denied
1541  * @id: id for debug trace
1542  * @ref: reference for debug trace
1543  *
1544  * Since the adapter has denied access, stop using the port and the
1545  * attached units.
1546  */
1547 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1548 {
1549         zfcp_erp_modify_port_status(port, id, ref,
1550                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1551                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1552 }
1553
1554 /**
1555  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1556  * @unit: unit where access has been denied
1557  * @id: id for debug trace
1558  * @ref: reference for debug trace
1559  *
1560  * Since the adapter has denied access, stop using the unit.
1561  */
1562 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1563 {
1564         zfcp_erp_modify_unit_status(unit, id, ref,
1565                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1566                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1567 }
1568
1569 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1570                                          void *ref)
1571 {
1572         int status = atomic_read(&unit->status);
1573         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1574                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1575                 return;
1576
1577         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1578 }
1579
1580 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1581                                          void *ref)
1582 {
1583         struct zfcp_unit *unit;
1584         unsigned long flags;
1585         int status = atomic_read(&port->status);
1586
1587         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1588                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1589                 read_lock_irqsave(&port->unit_list_lock, flags);
1590                 list_for_each_entry(unit, &port->unit_list, list)
1591                                     zfcp_erp_unit_access_changed(unit, id, ref);
1592                 read_unlock_irqrestore(&port->unit_list_lock, flags);
1593                 return;
1594         }
1595
1596         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1597 }
1598
1599 /**
1600  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1601  * @adapter: Adapter where the Access Control Table (ACT) changed
1602  * @id: Id for debug trace
1603  * @ref: Reference for debug trace
1604  */
1605 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1606                                      void *ref)
1607 {
1608         unsigned long flags;
1609         struct zfcp_port *port;
1610
1611         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1612                 return;
1613
1614         read_lock_irqsave(&adapter->port_list_lock, flags);
1615         list_for_each_entry(port, &adapter->port_list, list)
1616                 zfcp_erp_port_access_changed(port, id, ref);
1617         read_unlock_irqrestore(&adapter->port_list_lock, flags);
1618 }