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 "zfcp_ext.h"
  13
  14 #define ZFCP_MAX_ERPS                   3
  15
  16 enum zfcp_erp_act_flags {
  17         ZFCP_STATUS_ERP_TIMEDOUT        = 0x10000000,
  18         ZFCP_STATUS_ERP_CLOSE_ONLY      = 0x01000000,
  19         ZFCP_STATUS_ERP_DISMISSING      = 0x00100000,
  20         ZFCP_STATUS_ERP_DISMISSED       = 0x00200000,
  21         ZFCP_STATUS_ERP_LOWMEM          = 0x00400000,
  22 };
  23
  24 enum zfcp_erp_steps {
  25         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
  26         ZFCP_ERP_STEP_FSF_XCONFIG       = 0x0001,
  27         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
  28         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
  29         ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
  30         ZFCP_ERP_STEP_UNIT_CLOSING      = 0x1000,
  31         ZFCP_ERP_STEP_UNIT_OPENING      = 0x2000,
  32 };
  33
  34 enum zfcp_erp_act_type {
  35         ZFCP_ERP_ACTION_REOPEN_UNIT        = 1,
  36         ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
  37         ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
  38         ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
  39 };
  40
  41 enum zfcp_erp_act_state {
  42         ZFCP_ERP_ACTION_RUNNING = 1,
  43         ZFCP_ERP_ACTION_READY   = 2,
  44 };
  45
  46 enum zfcp_erp_act_result {
  47         ZFCP_ERP_SUCCEEDED = 0,
  48         ZFCP_ERP_FAILED    = 1,
  49         ZFCP_ERP_CONTINUES = 2,
  50         ZFCP_ERP_EXIT      = 3,
  51         ZFCP_ERP_DISMISSED = 4,
  52         ZFCP_ERP_NOMEM     = 5,
  53 };
  54
  55 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
  56 {
  57         zfcp_erp_modify_adapter_status(adapter, "erablk1", NULL,
  58                                        ZFCP_STATUS_COMMON_UNBLOCKED | mask,
  59                                        ZFCP_CLEAR);
  60 }
  61
  62 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
  63 {
  64         struct zfcp_erp_action *curr_act;
  65
  66         list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
  67                 if (act == curr_act)
  68                         return ZFCP_ERP_ACTION_RUNNING;
  69         return 0;
  70 }
  71
  72 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
  73 {
  74         struct zfcp_adapter *adapter = act->adapter;
  75
  76         list_move(&act->list, &act->adapter->erp_ready_head);
  77         zfcp_rec_dbf_event_action("erardy1", act);
  78         up(&adapter->erp_ready_sem);
  79         zfcp_rec_dbf_event_thread("erardy2", adapter);
  80 }
  81
  82 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
  83 {
  84         act->status |= ZFCP_STATUS_ERP_DISMISSED;
  85         if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
  86                 zfcp_erp_action_ready(act);
  87 }
  88
  89 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
  90 {
  91         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
  92                 zfcp_erp_action_dismiss(&unit->erp_action);
  93 }
  94
  95 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
  96 {
  97         struct zfcp_unit *unit;
  98
  99         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 100                 zfcp_erp_action_dismiss(&port->erp_action);
 101         else
 102                 list_for_each_entry(unit, &port->unit_list_head, list)
 103                     zfcp_erp_action_dismiss_unit(unit);
 104 }
 105
 106 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 107 {
 108         struct zfcp_port *port;
 109
 110         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 111                 zfcp_erp_action_dismiss(&adapter->erp_action);
 112         else
 113                 list_for_each_entry(port, &adapter->port_list_head, list)
 114                     zfcp_erp_action_dismiss_port(port);
 115 }
 116
 117 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 118                                  struct zfcp_port *port,
 119                                  struct zfcp_unit *unit)
 120 {
 121         int need = want;
 122         int u_status, p_status, a_status;
 123
 124         switch (want) {
 125         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 126                 u_status = atomic_read(&unit->status);
 127                 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 128                         return 0;
 129                 p_status = atomic_read(&port->status);
 130                 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
 131                       p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 132                         return 0;
 133                 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 134                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 135                 /* fall through */
 136         case ZFCP_ERP_ACTION_REOPEN_PORT:
 137         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 138                 p_status = atomic_read(&port->status);
 139                 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 140                         return 0;
 141                 a_status = atomic_read(&adapter->status);
 142                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
 143                       a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 144                         return 0;
 145                 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 146                         need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
 147                 /* fall through */
 148         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 149                 a_status = atomic_read(&adapter->status);
 150                 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 151                         return 0;
 152         }
 153
 154         return need;
 155 }
 156
 157 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
 158                                                   struct zfcp_adapter *adapter,
 159                                                   struct zfcp_port *port,
 160                                                   struct zfcp_unit *unit)
 161 {
 162         struct zfcp_erp_action *erp_action;
 163         u32 status = 0;
 164
 165         switch (need) {
 166         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 167                 zfcp_unit_get(unit);
 168                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
 169                 erp_action = &unit->erp_action;
 170                 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
 171                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 172                 break;
 173
 174         case ZFCP_ERP_ACTION_REOPEN_PORT:
 175         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 176                 zfcp_port_get(port);
 177                 zfcp_erp_action_dismiss_port(port);
 178                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
 179                 erp_action = &port->erp_action;
 180                 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
 181                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 182                 break;
 183
 184         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 185                 zfcp_adapter_get(adapter);
 186                 zfcp_erp_action_dismiss_adapter(adapter);
 187                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
 188                 erp_action = &adapter->erp_action;
 189                 if (!(atomic_read(&adapter->status) &
 190                       ZFCP_STATUS_COMMON_RUNNING))
 191                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 192                 break;
 193
 194         default:
 195                 return NULL;
 196         }
 197
 198         memset(erp_action, 0, sizeof(struct zfcp_erp_action));
 199         erp_action->adapter = adapter;
 200         erp_action->port = port;
 201         erp_action->unit = unit;
 202         erp_action->action = need;
 203         erp_action->status = status;
 204
 205         return erp_action;
 206 }
 207
 208 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 209                                    struct zfcp_port *port,
 210                                    struct zfcp_unit *unit, char *id, void *ref)
 211 {
 212         int retval = 1, need;
 213         struct zfcp_erp_action *act = NULL;
 214
 215         if (!(atomic_read(&adapter->status) &
 216               ZFCP_STATUS_ADAPTER_ERP_THREAD_UP))
 217                 return -EIO;
 218
 219         need = zfcp_erp_required_act(want, adapter, port, unit);
 220         if (!need)
 221                 goto out;
 222
 223         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 224         act = zfcp_erp_setup_act(need, adapter, port, unit);
 225         if (!act)
 226                 goto out;
 227         ++adapter->erp_total_count;
 228         list_add_tail(&act->list, &adapter->erp_ready_head);
 229         up(&adapter->erp_ready_sem);
 230         zfcp_rec_dbf_event_thread("eracte1", adapter);
 231         retval = 0;
 232  out:
 233         zfcp_rec_dbf_event_trigger(id, ref, want, need, act,
 234                                    adapter, port, unit);
 235         return retval;
 236 }
 237
 238 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 239                                     int clear_mask, char *id, void *ref)
 240 {
 241         zfcp_erp_adapter_block(adapter, clear_mask);
 242         zfcp_scsi_schedule_rports_block(adapter);
 243
 244         /* ensure propagation of failed status to new devices */
 245         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 246                 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
 247                 return -EIO;
 248         }
 249         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 250                                        adapter, NULL, NULL, id, ref);
 251 }
 252
 253 /**
 254  * zfcp_erp_adapter_reopen - Reopen adapter.
 255  * @adapter: Adapter to reopen.
 256  * @clear: Status flags to clear.
 257  * @id: Id for debug trace event.
 258  * @ref: Reference for debug trace event.
 259  */
 260 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
 261                              char *id, void *ref)
 262 {
 263         unsigned long flags;
 264
 265         read_lock_irqsave(&zfcp_data.config_lock, flags);
 266         write_lock(&adapter->erp_lock);
 267         _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
 268         write_unlock(&adapter->erp_lock);
 269         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 270 }
 271
 272 /**
 273  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 274  * @adapter: Adapter to shut down.
 275  * @clear: Status flags to clear.
 276  * @id: Id for debug trace event.
 277  * @ref: Reference for debug trace event.
 278  */
 279 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 280                                char *id, void *ref)
 281 {
 282         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 283         zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
 284 }
 285
 286 /**
 287  * zfcp_erp_port_shutdown - Shutdown port
 288  * @port: Port to shut down.
 289  * @clear: Status flags to clear.
 290  * @id: Id for debug trace event.
 291  * @ref: Reference for debug trace event.
 292  */
 293 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id,
 294                             void *ref)
 295 {
 296         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 297         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 298 }
 299
 300 /**
 301  * zfcp_erp_unit_shutdown - Shutdown unit
 302  * @unit: Unit to shut down.
 303  * @clear: Status flags to clear.
 304  * @id: Id for debug trace event.
 305  * @ref: Reference for debug trace event.
 306  */
 307 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
 308                             void *ref)
 309 {
 310         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 311         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 312 }
 313
 314 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 315 {
 316         zfcp_erp_modify_port_status(port, "erpblk1", NULL,
 317                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 318                                     ZFCP_CLEAR);
 319 }
 320
 321 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 322                                          int clear, char *id, void *ref)
 323 {
 324         zfcp_erp_port_block(port, clear);
 325         zfcp_scsi_schedule_rport_block(port);
 326
 327         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 328                 return;
 329
 330         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 331                                 port->adapter, port, NULL, id, ref);
 332 }
 333
 334 /**
 335  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 336  * @port: Port to force close and to reopen.
 337  * @id: Id for debug trace event.
 338  * @ref: Reference for debug trace event.
 339  */
 340 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id,
 341                                  void *ref)
 342 {
 343         unsigned long flags;
 344         struct zfcp_adapter *adapter = port->adapter;
 345
 346         read_lock_irqsave(&zfcp_data.config_lock, flags);
 347         write_lock(&adapter->erp_lock);
 348         _zfcp_erp_port_forced_reopen(port, clear, id, ref);
 349         write_unlock(&adapter->erp_lock);
 350         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 351 }
 352
 353 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id,
 354                                  void *ref)
 355 {
 356         zfcp_erp_port_block(port, clear);
 357         zfcp_scsi_schedule_rport_block(port);
 358
 359         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 360                 /* ensure propagation of failed status to new devices */
 361                 zfcp_erp_port_failed(port, "erpreo1", NULL);
 362                 return -EIO;
 363         }
 364
 365         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 366                                        port->adapter, port, NULL, id, ref);
 367 }
 368
 369 /**
 370  * zfcp_erp_port_reopen - trigger remote port recovery
 371  * @port: port to recover
 372  * @clear_mask: flags in port status to be cleared
 373  *
 374  * Returns 0 if recovery has been triggered, < 0 if not.
 375  */
 376 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
 377 {
 378         unsigned long flags;
 379         int retval;
 380         struct zfcp_adapter *adapter = port->adapter;
 381
 382         read_lock_irqsave(&zfcp_data.config_lock, flags);
 383         write_lock(&adapter->erp_lock);
 384         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 385         write_unlock(&adapter->erp_lock);
 386         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 387
 388         return retval;
 389 }
 390
 391 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 392 {
 393         zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
 394                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 395                                     ZFCP_CLEAR);
 396 }
 397
 398 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 399                                   void *ref)
 400 {
 401         struct zfcp_adapter *adapter = unit->port->adapter;
 402
 403         zfcp_erp_unit_block(unit, clear);
 404
 405         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 406                 return;
 407
 408         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 409                                 adapter, unit->port, unit, id, ref);
 410 }
 411
 412 /**
 413  * zfcp_erp_unit_reopen - initiate reopen of a unit
 414  * @unit: unit to be reopened
 415  * @clear_mask: specifies flags in unit status to be cleared
 416  * Return: 0 on success, < 0 on error
 417  */
 418 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 419                           void *ref)
 420 {
 421         unsigned long flags;
 422         struct zfcp_port *port = unit->port;
 423         struct zfcp_adapter *adapter = port->adapter;
 424
 425         read_lock_irqsave(&zfcp_data.config_lock, flags);
 426         write_lock(&adapter->erp_lock);
 427         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 428         write_unlock(&adapter->erp_lock);
 429         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 430 }
 431
 432 static int status_change_set(unsigned long mask, atomic_t *status)
 433 {
 434         return (atomic_read(status) ^ mask) & mask;
 435 }
 436
 437 static int status_change_clear(unsigned long mask, atomic_t *status)
 438 {
 439         return atomic_read(status) & mask;
 440 }
 441
 442 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 443 {
 444         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 445                 zfcp_rec_dbf_event_adapter("eraubl1", NULL, adapter);
 446         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 447 }
 448
 449 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 450 {
 451         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 452                 zfcp_rec_dbf_event_port("erpubl1", NULL, port);
 453         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 454 }
 455
 456 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 457 {
 458         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 459                 zfcp_rec_dbf_event_unit("eruubl1", NULL, unit);
 460         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 461 }
 462
 463 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 464 {
 465         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 466         zfcp_rec_dbf_event_action("erator1", erp_action);
 467 }
 468
 469 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 470 {
 471         struct zfcp_adapter *adapter = act->adapter;
 472
 473         if (!act->fsf_req)
 474                 return;
 475
 476         spin_lock(&adapter->req_list_lock);
 477         if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
 478             act->fsf_req->erp_action == act) {
 479                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 480                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 481                         act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 482                         zfcp_rec_dbf_event_action("erscf_1", act);
 483                         act->fsf_req->erp_action = NULL;
 484                 }
 485                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 486                         zfcp_rec_dbf_event_action("erscf_2", act);
 487                 if (act->fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
 488                         act->fsf_req = NULL;
 489         } else
 490                 act->fsf_req = NULL;
 491         spin_unlock(&adapter->req_list_lock);
 492 }
 493
 494 /**
 495  * zfcp_erp_notify - Trigger ERP action.
 496  * @erp_action: ERP action to continue.
 497  * @set_mask: ERP action status flags to set.
 498  */
 499 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 500 {
 501         struct zfcp_adapter *adapter = erp_action->adapter;
 502         unsigned long flags;
 503
 504         write_lock_irqsave(&adapter->erp_lock, flags);
 505         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 506                 erp_action->status |= set_mask;
 507                 zfcp_erp_action_ready(erp_action);
 508         }
 509         write_unlock_irqrestore(&adapter->erp_lock, flags);
 510 }
 511
 512 /**
 513  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 514  * @data: ERP action (from timer data)
 515  */
 516 void zfcp_erp_timeout_handler(unsigned long data)
 517 {
 518         struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
 519         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 520 }
 521
 522 static void zfcp_erp_memwait_handler(unsigned long data)
 523 {
 524         zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
 525 }
 526
 527 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 528 {
 529         init_timer(&erp_action->timer);
 530         erp_action->timer.function = zfcp_erp_memwait_handler;
 531         erp_action->timer.data = (unsigned long) erp_action;
 532         erp_action->timer.expires = jiffies + HZ;
 533         add_timer(&erp_action->timer);
 534 }
 535
 536 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 537                                       int clear, char *id, void *ref)
 538 {
 539         struct zfcp_port *port;
 540
 541         list_for_each_entry(port, &adapter->port_list_head, list)
 542                 _zfcp_erp_port_reopen(port, clear, id, ref);
 543 }
 544
 545 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
 546                                       char *id, void *ref)
 547 {
 548         struct zfcp_unit *unit;
 549
 550         list_for_each_entry(unit, &port->unit_list_head, list)
 551                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 552 }
 553
 554 static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
 555 {
 556         switch (act->action) {
 557         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 558                 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1", NULL);
 559                 break;
 560         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 561                 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2", NULL);
 562                 break;
 563         case ZFCP_ERP_ACTION_REOPEN_PORT:
 564                 _zfcp_erp_port_reopen(act->port, 0, "ersff_3", NULL);
 565                 break;
 566         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 567                 _zfcp_erp_unit_reopen(act->unit, 0, "ersff_4", NULL);
 568                 break;
 569         }
 570 }
 571
 572 static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
 573 {
 574         switch (act->action) {
 575         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 576                 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1", NULL);
 577                 break;
 578         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 579                 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2", NULL);
 580                 break;
 581         case ZFCP_ERP_ACTION_REOPEN_PORT:
 582                 _zfcp_erp_unit_reopen_all(act->port, 0, "ersfs_3", NULL);
 583                 break;
 584         }
 585 }
 586
 587 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 588 {
 589         unsigned long flags;
 590
 591         read_lock_irqsave(&zfcp_data.config_lock, flags);
 592         read_lock(&adapter->erp_lock);
 593         if (list_empty(&adapter->erp_ready_head) &&
 594             list_empty(&adapter->erp_running_head)) {
 595                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 596                                           &adapter->status);
 597                         wake_up(&adapter->erp_done_wqh);
 598         }
 599         read_unlock(&adapter->erp_lock);
 600         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 601 }
 602
 603 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 604 {
 605         struct zfcp_qdio *qdio = act->adapter->qdio;
 606
 607         if (zfcp_qdio_open(qdio))
 608                 return ZFCP_ERP_FAILED;
 609         init_waitqueue_head(&qdio->req_q_wq);
 610         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 611         return ZFCP_ERP_SUCCEEDED;
 612 }
 613
 614 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 615 {
 616         struct zfcp_port *port;
 617         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 618                                  adapter->peer_d_id);
 619         if (IS_ERR(port)) /* error or port already attached */
 620                 return;
 621         _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
 622 }
 623
 624 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 625 {
 626         int retries;
 627         int sleep = 1;
 628         struct zfcp_adapter *adapter = erp_action->adapter;
 629
 630         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 631
 632         for (retries = 7; retries; retries--) {
 633                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 634                                   &adapter->status);
 635                 write_lock_irq(&adapter->erp_lock);
 636                 zfcp_erp_action_to_running(erp_action);
 637                 write_unlock_irq(&adapter->erp_lock);
 638                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 639                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 640                                           &adapter->status);
 641                         return ZFCP_ERP_FAILED;
 642                 }
 643
 644                 zfcp_rec_dbf_event_thread_lock("erasfx1", adapter);
 645                 down(&adapter->erp_ready_sem);
 646                 zfcp_rec_dbf_event_thread_lock("erasfx2", adapter);
 647                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 648                         break;
 649
 650                 if (!(atomic_read(&adapter->status) &
 651                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 652                         break;
 653
 654                 ssleep(sleep);
 655                 sleep *= 2;
 656         }
 657
 658         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 659                           &adapter->status);
 660
 661         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 662                 return ZFCP_ERP_FAILED;
 663
 664         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 665                 zfcp_erp_enqueue_ptp_port(adapter);
 666
 667         return ZFCP_ERP_SUCCEEDED;
 668 }
 669
 670 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 671 {
 672         int ret;
 673         struct zfcp_adapter *adapter = act->adapter;
 674
 675         write_lock_irq(&adapter->erp_lock);
 676         zfcp_erp_action_to_running(act);
 677         write_unlock_irq(&adapter->erp_lock);
 678
 679         ret = zfcp_fsf_exchange_port_data(act);
 680         if (ret == -EOPNOTSUPP)
 681                 return ZFCP_ERP_SUCCEEDED;
 682         if (ret)
 683                 return ZFCP_ERP_FAILED;
 684
 685         zfcp_rec_dbf_event_thread_lock("erasox1", adapter);
 686         down(&adapter->erp_ready_sem);
 687         zfcp_rec_dbf_event_thread_lock("erasox2", adapter);
 688         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 689                 return ZFCP_ERP_FAILED;
 690
 691         return ZFCP_ERP_SUCCEEDED;
 692 }
 693
 694 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 695 {
 696         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 697                 return ZFCP_ERP_FAILED;
 698
 699         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 700                 return ZFCP_ERP_FAILED;
 701
 702         atomic_set(&act->adapter->stat_miss, 16);
 703         if (zfcp_status_read_refill(act->adapter))
 704                 return ZFCP_ERP_FAILED;
 705
 706         return ZFCP_ERP_SUCCEEDED;
 707 }
 708
 709 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 710 {
 711         struct zfcp_adapter *adapter = act->adapter;
 712
 713         /* close queues to ensure that buffers are not accessed by adapter */
 714         zfcp_qdio_close(adapter->qdio);
 715         zfcp_fsf_req_dismiss_all(adapter);
 716         adapter->fsf_req_seq_no = 0;
 717         zfcp_fc_wka_ports_force_offline(adapter->gs);
 718         /* all ports and units are closed */
 719         zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
 720                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 721
 722         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 723                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 724 }
 725
 726 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
 727 {
 728         struct zfcp_adapter *adapter = act->adapter;
 729
 730         if (zfcp_erp_adapter_strategy_open_qdio(act)) {
 731                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 732                                   ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 733                                   &adapter->status);
 734                 return ZFCP_ERP_FAILED;
 735         }
 736
 737         if (zfcp_erp_adapter_strategy_open_fsf(act)) {
 738                 zfcp_erp_adapter_strategy_close(act);
 739                 return ZFCP_ERP_FAILED;
 740         }
 741
 742         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
 743
 744         return ZFCP_ERP_SUCCEEDED;
 745 }
 746
 747 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 748 {
 749         struct zfcp_adapter *adapter = act->adapter;
 750
 751         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
 752                 zfcp_erp_adapter_strategy_close(act);
 753                 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 754                         return ZFCP_ERP_EXIT;
 755         }
 756
 757         if (zfcp_erp_adapter_strategy_open(act)) {
 758                 ssleep(8);
 759                 return ZFCP_ERP_FAILED;
 760         }
 761
 762         return ZFCP_ERP_SUCCEEDED;
 763 }
 764
 765 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 766 {
 767         int retval;
 768
 769         retval = zfcp_fsf_close_physical_port(act);
 770         if (retval == -ENOMEM)
 771                 return ZFCP_ERP_NOMEM;
 772         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 773         if (retval)
 774                 return ZFCP_ERP_FAILED;
 775
 776         return ZFCP_ERP_CONTINUES;
 777 }
 778
 779 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 780 {
 781         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
 782 }
 783
 784 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 785 {
 786         struct zfcp_port *port = erp_action->port;
 787         int status = atomic_read(&port->status);
 788
 789         switch (erp_action->step) {
 790         case ZFCP_ERP_STEP_UNINITIALIZED:
 791                 zfcp_erp_port_strategy_clearstati(port);
 792                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 793                     (status & ZFCP_STATUS_COMMON_OPEN))
 794                         return zfcp_erp_port_forced_strategy_close(erp_action);
 795                 else
 796                         return ZFCP_ERP_FAILED;
 797
 798         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 799                 if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
 800                         return ZFCP_ERP_SUCCEEDED;
 801         }
 802         return ZFCP_ERP_FAILED;
 803 }
 804
 805 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 806 {
 807         int retval;
 808
 809         retval = zfcp_fsf_close_port(erp_action);
 810         if (retval == -ENOMEM)
 811                 return ZFCP_ERP_NOMEM;
 812         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 813         if (retval)
 814                 return ZFCP_ERP_FAILED;
 815         return ZFCP_ERP_CONTINUES;
 816 }
 817
 818 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 819 {
 820         int retval;
 821
 822         retval = zfcp_fsf_open_port(erp_action);
 823         if (retval == -ENOMEM)
 824                 return ZFCP_ERP_NOMEM;
 825         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 826         if (retval)
 827                 return ZFCP_ERP_FAILED;
 828         return ZFCP_ERP_CONTINUES;
 829 }
 830
 831 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 832 {
 833         struct zfcp_adapter *adapter = act->adapter;
 834         struct zfcp_port *port = act->port;
 835
 836         if (port->wwpn != adapter->peer_wwpn) {
 837                 zfcp_erp_port_failed(port, "eroptp1", NULL);
 838                 return ZFCP_ERP_FAILED;
 839         }
 840         port->d_id = adapter->peer_d_id;
 841         return zfcp_erp_port_strategy_open_port(act);
 842 }
 843
 844 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 845 {
 846         struct zfcp_adapter *adapter = act->adapter;
 847         struct zfcp_port *port = act->port;
 848         int p_status = atomic_read(&port->status);
 849
 850         switch (act->step) {
 851         case ZFCP_ERP_STEP_UNINITIALIZED:
 852         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 853         case ZFCP_ERP_STEP_PORT_CLOSING:
 854                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 855                         return zfcp_erp_open_ptp_port(act);
 856                 if (!port->d_id) {
 857                         zfcp_port_get(port);
 858                         if (!queue_work(adapter->work_queue,
 859                                         &port->gid_pn_work))
 860                                 zfcp_port_put(port);
 861                         return ZFCP_ERP_EXIT;
 862                 }
 863                 return zfcp_erp_port_strategy_open_port(act);
 864
 865         case ZFCP_ERP_STEP_PORT_OPENING:
 866                 /* D_ID might have changed during open */
 867                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 868                         if (port->d_id)
 869                                 return ZFCP_ERP_SUCCEEDED;
 870                         else {
 871                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 872                                 return ZFCP_ERP_CONTINUES;
 873                         }
 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
 889         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 890                 goto close_init_done;
 891
 892         switch (erp_action->step) {
 893         case ZFCP_ERP_STEP_UNINITIALIZED:
 894                 zfcp_erp_port_strategy_clearstati(port);
 895                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 896                         return zfcp_erp_port_strategy_close(erp_action);
 897                 break;
 898
 899         case ZFCP_ERP_STEP_PORT_CLOSING:
 900                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 901                         return ZFCP_ERP_FAILED;
 902                 break;
 903         }
 904
 905 close_init_done:
 906         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 907                 return ZFCP_ERP_EXIT;
 908
 909         return zfcp_erp_port_strategy_open_common(erp_action);
 910 }
 911
 912 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 913 {
 914         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 915                           ZFCP_STATUS_UNIT_SHARED |
 916                           ZFCP_STATUS_UNIT_READONLY,
 917                           &unit->status);
 918 }
 919
 920 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 921 {
 922         int retval = zfcp_fsf_close_unit(erp_action);
 923         if (retval == -ENOMEM)
 924                 return ZFCP_ERP_NOMEM;
 925         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 926         if (retval)
 927                 return ZFCP_ERP_FAILED;
 928         return ZFCP_ERP_CONTINUES;
 929 }
 930
 931 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 932 {
 933         int retval = zfcp_fsf_open_unit(erp_action);
 934         if (retval == -ENOMEM)
 935                 return ZFCP_ERP_NOMEM;
 936         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 937         if (retval)
 938                 return  ZFCP_ERP_FAILED;
 939         return ZFCP_ERP_CONTINUES;
 940 }
 941
 942 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 943 {
 944         struct zfcp_unit *unit = erp_action->unit;
 945
 946         switch (erp_action->step) {
 947         case ZFCP_ERP_STEP_UNINITIALIZED:
 948                 zfcp_erp_unit_strategy_clearstati(unit);
 949                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 950                         return zfcp_erp_unit_strategy_close(erp_action);
 951                 /* already closed, fall through */
 952         case ZFCP_ERP_STEP_UNIT_CLOSING:
 953                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 954                         return ZFCP_ERP_FAILED;
 955                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 956                         return ZFCP_ERP_EXIT;
 957                 return zfcp_erp_unit_strategy_open(erp_action);
 958
 959         case ZFCP_ERP_STEP_UNIT_OPENING:
 960                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 961                         return ZFCP_ERP_SUCCEEDED;
 962         }
 963         return ZFCP_ERP_FAILED;
 964 }
 965
 966 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 967 {
 968         switch (result) {
 969         case ZFCP_ERP_SUCCEEDED :
 970                 atomic_set(&unit->erp_counter, 0);
 971                 zfcp_erp_unit_unblock(unit);
 972                 break;
 973         case ZFCP_ERP_FAILED :
 974                 atomic_inc(&unit->erp_counter);
 975                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
 976                         dev_err(&unit->port->adapter->ccw_device->dev,
 977                                 "ERP failed for unit 0x%016Lx on "
 978                                 "port 0x%016Lx\n",
 979                                 (unsigned long long)unit->fcp_lun,
 980                                 (unsigned long long)unit->port->wwpn);
 981                         zfcp_erp_unit_failed(unit, "erusck1", NULL);
 982                 }
 983                 break;
 984         }
 985
 986         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 987                 zfcp_erp_unit_block(unit, 0);
 988                 result = ZFCP_ERP_EXIT;
 989         }
 990         return result;
 991 }
 992
 993 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
 994 {
 995         switch (result) {
 996         case ZFCP_ERP_SUCCEEDED :
 997                 atomic_set(&port->erp_counter, 0);
 998                 zfcp_erp_port_unblock(port);
 999                 break;
1000
1001         case ZFCP_ERP_FAILED :
1002                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1003                         zfcp_erp_port_block(port, 0);
1004                         result = ZFCP_ERP_EXIT;
1005                 }
1006                 atomic_inc(&port->erp_counter);
1007                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1008                         dev_err(&port->adapter->ccw_device->dev,
1009                                 "ERP failed for remote port 0x%016Lx\n",
1010                                 (unsigned long long)port->wwpn);
1011                         zfcp_erp_port_failed(port, "erpsck1", NULL);
1012                 }
1013                 break;
1014         }
1015
1016         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1017                 zfcp_erp_port_block(port, 0);
1018                 result = ZFCP_ERP_EXIT;
1019         }
1020         return result;
1021 }
1022
1023 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1024                                            int result)
1025 {
1026         switch (result) {
1027         case ZFCP_ERP_SUCCEEDED :
1028                 atomic_set(&adapter->erp_counter, 0);
1029                 zfcp_erp_adapter_unblock(adapter);
1030                 break;
1031
1032         case ZFCP_ERP_FAILED :
1033                 atomic_inc(&adapter->erp_counter);
1034                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1035                         dev_err(&adapter->ccw_device->dev,
1036                                 "ERP cannot recover an error "
1037                                 "on the FCP device\n");
1038                         zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1039                 }
1040                 break;
1041         }
1042
1043         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1044                 zfcp_erp_adapter_block(adapter, 0);
1045                 result = ZFCP_ERP_EXIT;
1046         }
1047         return result;
1048 }
1049
1050 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1051                                           int result)
1052 {
1053         struct zfcp_adapter *adapter = erp_action->adapter;
1054         struct zfcp_port *port = erp_action->port;
1055         struct zfcp_unit *unit = erp_action->unit;
1056
1057         switch (erp_action->action) {
1058
1059         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1060                 result = zfcp_erp_strategy_check_unit(unit, result);
1061                 break;
1062
1063         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1064         case ZFCP_ERP_ACTION_REOPEN_PORT:
1065                 result = zfcp_erp_strategy_check_port(port, result);
1066                 break;
1067
1068         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1069                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1070                 break;
1071         }
1072         return result;
1073 }
1074
1075 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1076 {
1077         int status = atomic_read(target_status);
1078
1079         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1080             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1081                 return 1; /* take it online */
1082
1083         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1084             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1085                 return 1; /* take it offline */
1086
1087         return 0;
1088 }
1089
1090 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1091 {
1092         int action = act->action;
1093         struct zfcp_adapter *adapter = act->adapter;
1094         struct zfcp_port *port = act->port;
1095         struct zfcp_unit *unit = act->unit;
1096         u32 erp_status = act->status;
1097
1098         switch (action) {
1099         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1100                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1101                         _zfcp_erp_adapter_reopen(adapter,
1102                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1103                                                  "ersscg1", NULL);
1104                         return ZFCP_ERP_EXIT;
1105                 }
1106                 break;
1107
1108         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1109         case ZFCP_ERP_ACTION_REOPEN_PORT:
1110                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1111                         _zfcp_erp_port_reopen(port,
1112                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1113                                               "ersscg2", NULL);
1114                         return ZFCP_ERP_EXIT;
1115                 }
1116                 break;
1117
1118         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1119                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1120                         _zfcp_erp_unit_reopen(unit,
1121                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1122                                               "ersscg3", NULL);
1123                         return ZFCP_ERP_EXIT;
1124                 }
1125                 break;
1126         }
1127         return ret;
1128 }
1129
1130 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1131 {
1132         struct zfcp_adapter *adapter = erp_action->adapter;
1133
1134         adapter->erp_total_count--;
1135         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1136                 adapter->erp_low_mem_count--;
1137                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1138         }
1139
1140         list_del(&erp_action->list);
1141         zfcp_rec_dbf_event_action("eractd1", erp_action);
1142
1143         switch (erp_action->action) {
1144         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1145                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1146                                   &erp_action->unit->status);
1147                 break;
1148
1149         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1150         case ZFCP_ERP_ACTION_REOPEN_PORT:
1151                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1152                                   &erp_action->port->status);
1153                 break;
1154
1155         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1156                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1157                                   &erp_action->adapter->status);
1158                 break;
1159         }
1160 }
1161
1162 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1163 {
1164         struct zfcp_adapter *adapter = act->adapter;
1165         struct zfcp_port *port = act->port;
1166         struct zfcp_unit *unit = act->unit;
1167
1168         switch (act->action) {
1169         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1170                 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1171                         zfcp_unit_get(unit);
1172                         if (scsi_queue_work(unit->port->adapter->scsi_host,
1173                                             &unit->scsi_work) <= 0)
1174                                 zfcp_unit_put(unit);
1175                 }
1176                 zfcp_unit_put(unit);
1177                 break;
1178
1179         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1180         case ZFCP_ERP_ACTION_REOPEN_PORT:
1181                 if (result == ZFCP_ERP_SUCCEEDED)
1182                         zfcp_scsi_schedule_rport_register(port);
1183                 zfcp_port_put(port);
1184                 break;
1185
1186         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1187                 if (result == ZFCP_ERP_SUCCEEDED) {
1188                         register_service_level(&adapter->service_level);
1189                         schedule_work(&adapter->scan_work);
1190                 } else
1191                         unregister_service_level(&adapter->service_level);
1192                 zfcp_adapter_put(adapter);
1193                 break;
1194         }
1195 }
1196
1197 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1198 {
1199         switch (erp_action->action) {
1200         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1201                 return zfcp_erp_adapter_strategy(erp_action);
1202         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1203                 return zfcp_erp_port_forced_strategy(erp_action);
1204         case ZFCP_ERP_ACTION_REOPEN_PORT:
1205                 return zfcp_erp_port_strategy(erp_action);
1206         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1207                 return zfcp_erp_unit_strategy(erp_action);
1208         }
1209         return ZFCP_ERP_FAILED;
1210 }
1211
1212 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1213 {
1214         int retval;
1215         struct zfcp_adapter *adapter = erp_action->adapter;
1216         unsigned long flags;
1217
1218         read_lock_irqsave(&zfcp_data.config_lock, flags);
1219         write_lock(&adapter->erp_lock);
1220
1221         zfcp_erp_strategy_check_fsfreq(erp_action);
1222
1223         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1224                 zfcp_erp_action_dequeue(erp_action);
1225                 retval = ZFCP_ERP_DISMISSED;
1226                 goto unlock;
1227         }
1228
1229         zfcp_erp_action_to_running(erp_action);
1230
1231         /* no lock to allow for blocking operations */
1232         write_unlock(&adapter->erp_lock);
1233         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1234         retval = zfcp_erp_strategy_do_action(erp_action);
1235         read_lock_irqsave(&zfcp_data.config_lock, flags);
1236         write_lock(&adapter->erp_lock);
1237
1238         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1239                 retval = ZFCP_ERP_CONTINUES;
1240
1241         switch (retval) {
1242         case ZFCP_ERP_NOMEM:
1243                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1244                         ++adapter->erp_low_mem_count;
1245                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1246                 }
1247                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1248                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1249                 else {
1250                         zfcp_erp_strategy_memwait(erp_action);
1251                         retval = ZFCP_ERP_CONTINUES;
1252                 }
1253                 goto unlock;
1254
1255         case ZFCP_ERP_CONTINUES:
1256                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1257                         --adapter->erp_low_mem_count;
1258                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1259                 }
1260                 goto unlock;
1261         }
1262
1263         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1264         zfcp_erp_action_dequeue(erp_action);
1265         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1266         if (retval == ZFCP_ERP_EXIT)
1267                 goto unlock;
1268         if (retval == ZFCP_ERP_SUCCEEDED)
1269                 zfcp_erp_strategy_followup_success(erp_action);
1270         if (retval == ZFCP_ERP_FAILED)
1271                 zfcp_erp_strategy_followup_failed(erp_action);
1272
1273  unlock:
1274         write_unlock(&adapter->erp_lock);
1275         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1276
1277         if (retval != ZFCP_ERP_CONTINUES)
1278                 zfcp_erp_action_cleanup(erp_action, retval);
1279
1280         return retval;
1281 }
1282
1283 static int zfcp_erp_thread(void *data)
1284 {
1285         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1286         struct list_head *next;
1287         struct zfcp_erp_action *act;
1288         unsigned long flags;
1289         int ignore;
1290
1291         daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1292         /* Block all signals */
1293         siginitsetinv(&current->blocked, 0);
1294         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1295         wake_up(&adapter->erp_thread_wqh);
1296
1297         while (!(atomic_read(&adapter->status) &
1298                  ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1299
1300                 zfcp_rec_dbf_event_thread_lock("erthrd1", adapter);
1301                 ignore = down_interruptible(&adapter->erp_ready_sem);
1302                 zfcp_rec_dbf_event_thread_lock("erthrd2", adapter);
1303
1304                 write_lock_irqsave(&adapter->erp_lock, flags);
1305                 next = adapter->erp_ready_head.next;
1306                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1307
1308                 if (next != &adapter->erp_ready_head) {
1309                         act = list_entry(next, struct zfcp_erp_action, list);
1310
1311                         /* there is more to come after dismission, no notify */
1312                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1313                                 zfcp_erp_wakeup(adapter);
1314                 }
1315         }
1316
1317         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1318         wake_up(&adapter->erp_thread_wqh);
1319
1320         return 0;
1321 }
1322
1323 /**
1324  * zfcp_erp_thread_setup - Start ERP thread for adapter
1325  * @adapter: Adapter to start the ERP thread for
1326  *
1327  * Returns 0 on success or error code from kernel_thread()
1328  */
1329 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1330 {
1331         int retval;
1332
1333         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1334         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1335         if (retval < 0) {
1336                 dev_err(&adapter->ccw_device->dev,
1337                         "Creating an ERP thread for the FCP device failed.\n");
1338                 return retval;
1339         }
1340         wait_event(adapter->erp_thread_wqh,
1341                    atomic_read(&adapter->status) &
1342                         ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1343         return 0;
1344 }
1345
1346 /**
1347  * zfcp_erp_thread_kill - Stop ERP thread.
1348  * @adapter: Adapter where the ERP thread should be stopped.
1349  *
1350  * The caller of this routine ensures that the specified adapter has
1351  * been shut down and that this operation has been completed. Thus,
1352  * there are no pending erp_actions which would need to be handled
1353  * here.
1354  */
1355 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1356 {
1357         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1358         up(&adapter->erp_ready_sem);
1359         zfcp_rec_dbf_event_thread_lock("erthrk1", adapter);
1360
1361         wait_event(adapter->erp_thread_wqh,
1362                    !(atomic_read(&adapter->status) &
1363                                 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1364
1365         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1366                           &adapter->status);
1367 }
1368
1369 /**
1370  * zfcp_erp_adapter_failed - Set adapter status to failed.
1371  * @adapter: Failed adapter.
1372  * @id: Event id for debug trace.
1373  * @ref: Reference for debug trace.
1374  */
1375 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1376 {
1377         zfcp_erp_modify_adapter_status(adapter, id, ref,
1378                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1379 }
1380
1381 /**
1382  * zfcp_erp_port_failed - Set port status to failed.
1383  * @port: Failed port.
1384  * @id: Event id for debug trace.
1385  * @ref: Reference for debug trace.
1386  */
1387 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1388 {
1389         zfcp_erp_modify_port_status(port, id, ref,
1390                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1391 }
1392
1393 /**
1394  * zfcp_erp_unit_failed - Set unit status to failed.
1395  * @unit: Failed unit.
1396  * @id: Event id for debug trace.
1397  * @ref: Reference for debug trace.
1398  */
1399 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1400 {
1401         zfcp_erp_modify_unit_status(unit, id, ref,
1402                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1403 }
1404
1405 /**
1406  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1407  * @adapter: adapter for which to wait for completion of its error recovery
1408  */
1409 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1410 {
1411         wait_event(adapter->erp_done_wqh,
1412                    !(atomic_read(&adapter->status) &
1413                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1414 }
1415
1416 /**
1417  * zfcp_erp_modify_adapter_status - change adapter status bits
1418  * @adapter: adapter to change the status
1419  * @id: id for the debug trace
1420  * @ref: reference for the debug trace
1421  * @mask: status bits to change
1422  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1423  *
1424  * Changes in common status bits are propagated to attached ports and units.
1425  */
1426 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1427                                     void *ref, u32 mask, int set_or_clear)
1428 {
1429         struct zfcp_port *port;
1430         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1431
1432         if (set_or_clear == ZFCP_SET) {
1433                 if (status_change_set(mask, &adapter->status))
1434                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1435                 atomic_set_mask(mask, &adapter->status);
1436         } else {
1437                 if (status_change_clear(mask, &adapter->status))
1438                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1439                 atomic_clear_mask(mask, &adapter->status);
1440                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1441                         atomic_set(&adapter->erp_counter, 0);
1442         }
1443
1444         if (common_mask)
1445                 list_for_each_entry(port, &adapter->port_list_head, list)
1446                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1447                                                     set_or_clear);
1448 }
1449
1450 /**
1451  * zfcp_erp_modify_port_status - change port status bits
1452  * @port: port to change the status bits
1453  * @id: id for the debug trace
1454  * @ref: reference for the debug trace
1455  * @mask: status bits to change
1456  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1457  *
1458  * Changes in common status bits are propagated to attached units.
1459  */
1460 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1461                                  u32 mask, int set_or_clear)
1462 {
1463         struct zfcp_unit *unit;
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_rec_dbf_event_port(id, ref, port);
1469                 atomic_set_mask(mask, &port->status);
1470         } else {
1471                 if (status_change_clear(mask, &port->status))
1472                         zfcp_rec_dbf_event_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                 list_for_each_entry(unit, &port->unit_list_head, list)
1480                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1481                                                     set_or_clear);
1482 }
1483
1484 /**
1485  * zfcp_erp_modify_unit_status - change unit status bits
1486  * @unit: unit to change the status bits
1487  * @id: id for the debug trace
1488  * @ref: reference for the debug trace
1489  * @mask: status bits to change
1490  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1491  */
1492 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1493                                  u32 mask, int set_or_clear)
1494 {
1495         if (set_or_clear == ZFCP_SET) {
1496                 if (status_change_set(mask, &unit->status))
1497                         zfcp_rec_dbf_event_unit(id, ref, unit);
1498                 atomic_set_mask(mask, &unit->status);
1499         } else {
1500                 if (status_change_clear(mask, &unit->status))
1501                         zfcp_rec_dbf_event_unit(id, ref, unit);
1502                 atomic_clear_mask(mask, &unit->status);
1503                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1504                         atomic_set(&unit->erp_counter, 0);
1505                 }
1506         }
1507 }
1508
1509 /**
1510  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1511  * @port: The "boxed" port.
1512  * @id: The debug trace id.
1513  * @id: Reference for the debug trace.
1514  */
1515 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1516 {
1517         unsigned long flags;
1518
1519         read_lock_irqsave(&zfcp_data.config_lock, flags);
1520         zfcp_erp_modify_port_status(port, id, ref,
1521                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1522         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1523         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1524 }
1525
1526 /**
1527  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1528  * @port: The "boxed" unit.
1529  * @id: The debug trace id.
1530  * @id: Reference for the debug trace.
1531  */
1532 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1533 {
1534         zfcp_erp_modify_unit_status(unit, id, ref,
1535                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1536         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1537 }
1538
1539 /**
1540  * zfcp_erp_port_access_denied - Adapter denied access to port.
1541  * @port: port where access has been denied
1542  * @id: id for debug trace
1543  * @ref: reference for debug trace
1544  *
1545  * Since the adapter has denied access, stop using the port and the
1546  * attached units.
1547  */
1548 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1549 {
1550         unsigned long flags;
1551
1552         read_lock_irqsave(&zfcp_data.config_lock, flags);
1553         zfcp_erp_modify_port_status(port, id, ref,
1554                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1555                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1556         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1557 }
1558
1559 /**
1560  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1561  * @unit: unit where access has been denied
1562  * @id: id for debug trace
1563  * @ref: reference for debug trace
1564  *
1565  * Since the adapter has denied access, stop using the unit.
1566  */
1567 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1568 {
1569         zfcp_erp_modify_unit_status(unit, id, ref,
1570                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1571                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1572 }
1573
1574 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1575                                          void *ref)
1576 {
1577         int status = atomic_read(&unit->status);
1578         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1579                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1580                 return;
1581
1582         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1583 }
1584
1585 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1586                                          void *ref)
1587 {
1588         struct zfcp_unit *unit;
1589         int status = atomic_read(&port->status);
1590
1591         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1592                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1593                 list_for_each_entry(unit, &port->unit_list_head, list)
1594                                     zfcp_erp_unit_access_changed(unit, id, ref);
1595                 return;
1596         }
1597
1598         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1599 }
1600
1601 /**
1602  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1603  * @adapter: Adapter where the Access Control Table (ACT) changed
1604  * @id: Id for debug trace
1605  * @ref: Reference for debug trace
1606  */
1607 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1608                                      void *ref)
1609 {
1610         struct zfcp_port *port;
1611         unsigned long flags;
1612
1613         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1614                 return;
1615
1616         read_lock_irqsave(&zfcp_data.config_lock, flags);
1617         list_for_each_entry(port, &adapter->port_list_head, list)
1618                 zfcp_erp_port_access_changed(port, id, ref);
1619         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1620 }