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