drivers/s390/scsi/zfcp_erp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Error Recovery Procedures (ERP).
   6  *
   7  * Copyright IBM Corp. 2002, 2016
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/kthread.h>
  14 #include "zfcp_ext.h"
  15 #include "zfcp_reqlist.h"
  16
  17 #define ZFCP_MAX_ERPS                   3
  18
  19 enum zfcp_erp_act_flags {
  20         ZFCP_STATUS_ERP_TIMEDOUT        = 0x10000000,
  21         ZFCP_STATUS_ERP_CLOSE_ONLY      = 0x01000000,
  22         ZFCP_STATUS_ERP_DISMISSING      = 0x00100000,
  23         ZFCP_STATUS_ERP_DISMISSED       = 0x00200000,
  24         ZFCP_STATUS_ERP_LOWMEM          = 0x00400000,
  25         ZFCP_STATUS_ERP_NO_REF          = 0x00800000,
  26 };
  27
  28 enum zfcp_erp_steps {
  29         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
  30         ZFCP_ERP_STEP_FSF_XCONFIG       = 0x0001,
  31         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
  32         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
  33         ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
  34         ZFCP_ERP_STEP_LUN_CLOSING       = 0x1000,
  35         ZFCP_ERP_STEP_LUN_OPENING       = 0x2000,
  36 };
  37
  38 /**
  39  * enum zfcp_erp_act_type - Type of ERP action object.
  40  * @ZFCP_ERP_ACTION_REOPEN_LUN: LUN recovery.
  41  * @ZFCP_ERP_ACTION_REOPEN_PORT: Port recovery.
  42  * @ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: Forced port recovery.
  43  * @ZFCP_ERP_ACTION_REOPEN_ADAPTER: Adapter recovery.
  44  * @ZFCP_ERP_ACTION_NONE: Eyecatcher pseudo flag to bitwise or-combine with
  45  *                        either of the first four enum values.
  46  *                        Used to indicate that an ERP action could not be
  47  *                        set up despite a detected need for some recovery.
  48  * @ZFCP_ERP_ACTION_FAILED: Eyecatcher pseudo flag to bitwise or-combine with
  49  *                          either of the first four enum values.
  50  *                          Used to indicate that ERP not needed because
  51  *                          the object has ZFCP_STATUS_COMMON_ERP_FAILED.
  52  */
  53 enum zfcp_erp_act_type {
  54         ZFCP_ERP_ACTION_REOPEN_LUN         = 1,
  55         ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
  56         ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
  57         ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
  58         ZFCP_ERP_ACTION_NONE               = 0xc0,
  59         ZFCP_ERP_ACTION_FAILED             = 0xe0,
  60 };
  61
  62 enum zfcp_erp_act_state {
  63         ZFCP_ERP_ACTION_RUNNING = 1,
  64         ZFCP_ERP_ACTION_READY   = 2,
  65 };
  66
  67 enum zfcp_erp_act_result {
  68         ZFCP_ERP_SUCCEEDED = 0,
  69         ZFCP_ERP_FAILED    = 1,
  70         ZFCP_ERP_CONTINUES = 2,
  71         ZFCP_ERP_EXIT      = 3,
  72         ZFCP_ERP_DISMISSED = 4,
  73         ZFCP_ERP_NOMEM     = 5,
  74 };
  75
  76 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
  77 {
  78         zfcp_erp_clear_adapter_status(adapter,
  79                                        ZFCP_STATUS_COMMON_UNBLOCKED | mask);
  80 }
  81
  82 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
  83 {
  84         struct zfcp_erp_action *curr_act;
  85
  86         list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
  87                 if (act == curr_act)
  88                         return ZFCP_ERP_ACTION_RUNNING;
  89         return 0;
  90 }
  91
  92 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
  93 {
  94         struct zfcp_adapter *adapter = act->adapter;
  95
  96         list_move(&act->list, &act->adapter->erp_ready_head);
  97         zfcp_dbf_rec_run("erardy1", act);
  98         wake_up(&adapter->erp_ready_wq);
  99         zfcp_dbf_rec_run("erardy2", act);
 100 }
 101
 102 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
 103 {
 104         act->status |= ZFCP_STATUS_ERP_DISMISSED;
 105         if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
 106                 zfcp_erp_action_ready(act);
 107 }
 108
 109 static void zfcp_erp_action_dismiss_lun(struct scsi_device *sdev)
 110 {
 111         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 112
 113         if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 114                 zfcp_erp_action_dismiss(&zfcp_sdev->erp_action);
 115 }
 116
 117 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
 118 {
 119         struct scsi_device *sdev;
 120
 121         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 122                 zfcp_erp_action_dismiss(&port->erp_action);
 123         else {
 124                 spin_lock(port->adapter->scsi_host->host_lock);
 125                 __shost_for_each_device(sdev, port->adapter->scsi_host)
 126                         if (sdev_to_zfcp(sdev)->port == port)
 127                                 zfcp_erp_action_dismiss_lun(sdev);
 128                 spin_unlock(port->adapter->scsi_host->host_lock);
 129         }
 130 }
 131
 132 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 133 {
 134         struct zfcp_port *port;
 135
 136         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 137                 zfcp_erp_action_dismiss(&adapter->erp_action);
 138         else {
 139                 read_lock(&adapter->port_list_lock);
 140                 list_for_each_entry(port, &adapter->port_list, list)
 141                     zfcp_erp_action_dismiss_port(port);
 142                 read_unlock(&adapter->port_list_lock);
 143         }
 144 }
 145
 146 static int zfcp_erp_handle_failed(int want, struct zfcp_adapter *adapter,
 147                                   struct zfcp_port *port,
 148                                   struct scsi_device *sdev)
 149 {
 150         int need = want;
 151         struct zfcp_scsi_dev *zsdev;
 152
 153         switch (want) {
 154         case ZFCP_ERP_ACTION_REOPEN_LUN:
 155                 zsdev = sdev_to_zfcp(sdev);
 156                 if (atomic_read(&zsdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 157                         need = 0;
 158                 break;
 159         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 160                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 161                         need = 0;
 162                 break;
 163         case ZFCP_ERP_ACTION_REOPEN_PORT:
 164                 if (atomic_read(&port->status) &
 165                     ZFCP_STATUS_COMMON_ERP_FAILED) {
 166                         need = 0;
 167                         /* ensure propagation of failed status to new devices */
 168                         zfcp_erp_set_port_status(
 169                                 port, ZFCP_STATUS_COMMON_ERP_FAILED);
 170                 }
 171                 break;
 172         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 173                 if (atomic_read(&adapter->status) &
 174                     ZFCP_STATUS_COMMON_ERP_FAILED) {
 175                         need = 0;
 176                         /* ensure propagation of failed status to new devices */
 177                         zfcp_erp_set_adapter_status(
 178                                 adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 179                 }
 180                 break;
 181         default:
 182                 need = 0;
 183                 break;
 184         }
 185
 186         return need;
 187 }
 188
 189 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 190                                  struct zfcp_port *port,
 191                                  struct scsi_device *sdev)
 192 {
 193         int need = want;
 194         int l_status, p_status, a_status;
 195         struct zfcp_scsi_dev *zfcp_sdev;
 196
 197         switch (want) {
 198         case ZFCP_ERP_ACTION_REOPEN_LUN:
 199                 zfcp_sdev = sdev_to_zfcp(sdev);
 200                 l_status = atomic_read(&zfcp_sdev->status);
 201                 if (l_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 202                         return 0;
 203                 p_status = atomic_read(&port->status);
 204                 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
 205                       p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 206                         return 0;
 207                 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 208                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 209                 /* fall through */
 210         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 211                 p_status = atomic_read(&port->status);
 212                 if (!(p_status & ZFCP_STATUS_COMMON_OPEN))
 213                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 214                 /* fall through */
 215         case ZFCP_ERP_ACTION_REOPEN_PORT:
 216                 p_status = atomic_read(&port->status);
 217                 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 218                         return 0;
 219                 a_status = atomic_read(&adapter->status);
 220                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
 221                       a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 222                         return 0;
 223                 if (p_status & ZFCP_STATUS_COMMON_NOESC)
 224                         return need;
 225                 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 226                         need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
 227                 /* fall through */
 228         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 229                 a_status = atomic_read(&adapter->status);
 230                 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 231                         return 0;
 232                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
 233                     !(a_status & ZFCP_STATUS_COMMON_OPEN))
 234                         return 0; /* shutdown requested for closed adapter */
 235         }
 236
 237         return need;
 238 }
 239
 240 static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status,
 241                                                   struct zfcp_adapter *adapter,
 242                                                   struct zfcp_port *port,
 243                                                   struct scsi_device *sdev)
 244 {
 245         struct zfcp_erp_action *erp_action;
 246         struct zfcp_scsi_dev *zfcp_sdev;
 247
 248         switch (need) {
 249         case ZFCP_ERP_ACTION_REOPEN_LUN:
 250                 zfcp_sdev = sdev_to_zfcp(sdev);
 251                 if (!(act_status & ZFCP_STATUS_ERP_NO_REF))
 252                         if (scsi_device_get(sdev))
 253                                 return NULL;
 254                 atomic_or(ZFCP_STATUS_COMMON_ERP_INUSE,
 255                                 &zfcp_sdev->status);
 256                 erp_action = &zfcp_sdev->erp_action;
 257                 WARN_ON_ONCE(erp_action->port != port);
 258                 WARN_ON_ONCE(erp_action->sdev != sdev);
 259                 if (!(atomic_read(&zfcp_sdev->status) &
 260                       ZFCP_STATUS_COMMON_RUNNING))
 261                         act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
 262                 break;
 263
 264         case ZFCP_ERP_ACTION_REOPEN_PORT:
 265         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 266                 if (!get_device(&port->dev))
 267                         return NULL;
 268                 zfcp_erp_action_dismiss_port(port);
 269                 atomic_or(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
 270                 erp_action = &port->erp_action;
 271                 WARN_ON_ONCE(erp_action->port != port);
 272                 WARN_ON_ONCE(erp_action->sdev != NULL);
 273                 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
 274                         act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
 275                 break;
 276
 277         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 278                 kref_get(&adapter->ref);
 279                 zfcp_erp_action_dismiss_adapter(adapter);
 280                 atomic_or(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
 281                 erp_action = &adapter->erp_action;
 282                 WARN_ON_ONCE(erp_action->port != NULL);
 283                 WARN_ON_ONCE(erp_action->sdev != NULL);
 284                 if (!(atomic_read(&adapter->status) &
 285                       ZFCP_STATUS_COMMON_RUNNING))
 286                         act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
 287                 break;
 288
 289         default:
 290                 return NULL;
 291         }
 292
 293         WARN_ON_ONCE(erp_action->adapter != adapter);
 294         memset(&erp_action->list, 0, sizeof(erp_action->list));
 295         memset(&erp_action->timer, 0, sizeof(erp_action->timer));
 296         erp_action->step = ZFCP_ERP_STEP_UNINITIALIZED;
 297         erp_action->fsf_req_id = 0;
 298         erp_action->action = need;
 299         erp_action->status = act_status;
 300
 301         return erp_action;
 302 }
 303
 304 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 305                                    struct zfcp_port *port,
 306                                    struct scsi_device *sdev,
 307                                    char *id, u32 act_status)
 308 {
 309         int retval = 1, need;
 310         struct zfcp_erp_action *act;
 311
 312         need = zfcp_erp_handle_failed(want, adapter, port, sdev);
 313         if (!need) {
 314                 need = ZFCP_ERP_ACTION_FAILED; /* marker for trace */
 315                 goto out;
 316         }
 317
 318         if (!adapter->erp_thread) {
 319                 need = ZFCP_ERP_ACTION_NONE; /* marker for trace */
 320                 retval = -EIO;
 321                 goto out;
 322         }
 323
 324         need = zfcp_erp_required_act(want, adapter, port, sdev);
 325         if (!need)
 326                 goto out;
 327
 328         act = zfcp_erp_setup_act(need, act_status, adapter, port, sdev);
 329         if (!act) {
 330                 need |= ZFCP_ERP_ACTION_NONE; /* marker for trace */
 331                 goto out;
 332         }
 333         atomic_or(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 334         ++adapter->erp_total_count;
 335         list_add_tail(&act->list, &adapter->erp_ready_head);
 336         wake_up(&adapter->erp_ready_wq);
 337         retval = 0;
 338  out:
 339         zfcp_dbf_rec_trig(id, adapter, port, sdev, want, need);
 340         return retval;
 341 }
 342
 343 void zfcp_erp_port_forced_no_port_dbf(char *id, struct zfcp_adapter *adapter,
 344                                       u64 port_name, u32 port_id)
 345 {
 346         unsigned long flags;
 347         static /* don't waste stack */ struct zfcp_port tmpport;
 348
 349         write_lock_irqsave(&adapter->erp_lock, flags);
 350         /* Stand-in zfcp port with fields just good enough for
 351          * zfcp_dbf_rec_trig() and zfcp_dbf_set_common().
 352          * Under lock because tmpport is static.
 353          */
 354         atomic_set(&tmpport.status, -1); /* unknown */
 355         tmpport.wwpn = port_name;
 356         tmpport.d_id = port_id;
 357         zfcp_dbf_rec_trig(id, adapter, &tmpport, NULL,
 358                           ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 359                           ZFCP_ERP_ACTION_NONE);
 360         write_unlock_irqrestore(&adapter->erp_lock, flags);
 361 }
 362
 363 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 364                                     int clear_mask, char *id)
 365 {
 366         zfcp_erp_adapter_block(adapter, clear_mask);
 367         zfcp_scsi_schedule_rports_block(adapter);
 368
 369         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 370                                        adapter, NULL, NULL, id, 0);
 371 }
 372
 373 /**
 374  * zfcp_erp_adapter_reopen - Reopen adapter.
 375  * @adapter: Adapter to reopen.
 376  * @clear: Status flags to clear.
 377  * @id: Id for debug trace event.
 378  */
 379 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear, char *id)
 380 {
 381         unsigned long flags;
 382
 383         zfcp_erp_adapter_block(adapter, clear);
 384         zfcp_scsi_schedule_rports_block(adapter);
 385
 386         write_lock_irqsave(&adapter->erp_lock, flags);
 387         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter,
 388                                 NULL, NULL, id, 0);
 389         write_unlock_irqrestore(&adapter->erp_lock, flags);
 390 }
 391
 392 /**
 393  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 394  * @adapter: Adapter to shut down.
 395  * @clear: Status flags to clear.
 396  * @id: Id for debug trace event.
 397  */
 398 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 399                                char *id)
 400 {
 401         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 402         zfcp_erp_adapter_reopen(adapter, clear | flags, id);
 403 }
 404
 405 /**
 406  * zfcp_erp_port_shutdown - Shutdown port
 407  * @port: Port to shut down.
 408  * @clear: Status flags to clear.
 409  * @id: Id for debug trace event.
 410  */
 411 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id)
 412 {
 413         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 414         zfcp_erp_port_reopen(port, clear | flags, id);
 415 }
 416
 417 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 418 {
 419         zfcp_erp_clear_port_status(port,
 420                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear);
 421 }
 422
 423 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear,
 424                                          char *id)
 425 {
 426         zfcp_erp_port_block(port, clear);
 427         zfcp_scsi_schedule_rport_block(port);
 428
 429         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 430                                 port->adapter, port, NULL, id, 0);
 431 }
 432
 433 /**
 434  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 435  * @port: Port to force close and to reopen.
 436  * @clear: Status flags to clear.
 437  * @id: Id for debug trace event.
 438  */
 439 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id)
 440 {
 441         unsigned long flags;
 442         struct zfcp_adapter *adapter = port->adapter;
 443
 444         write_lock_irqsave(&adapter->erp_lock, flags);
 445         _zfcp_erp_port_forced_reopen(port, clear, id);
 446         write_unlock_irqrestore(&adapter->erp_lock, flags);
 447 }
 448
 449 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
 450 {
 451         zfcp_erp_port_block(port, clear);
 452         zfcp_scsi_schedule_rport_block(port);
 453
 454         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 455                                        port->adapter, port, NULL, id, 0);
 456 }
 457
 458 /**
 459  * zfcp_erp_port_reopen - trigger remote port recovery
 460  * @port: port to recover
 461  * @clear_mask: flags in port status to be cleared
 462  * @id: Id for debug trace event.
 463  *
 464  * Returns 0 if recovery has been triggered, < 0 if not.
 465  */
 466 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
 467 {
 468         int retval;
 469         unsigned long flags;
 470         struct zfcp_adapter *adapter = port->adapter;
 471
 472         write_lock_irqsave(&adapter->erp_lock, flags);
 473         retval = _zfcp_erp_port_reopen(port, clear, id);
 474         write_unlock_irqrestore(&adapter->erp_lock, flags);
 475
 476         return retval;
 477 }
 478
 479 static void zfcp_erp_lun_block(struct scsi_device *sdev, int clear_mask)
 480 {
 481         zfcp_erp_clear_lun_status(sdev,
 482                                   ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask);
 483 }
 484
 485 static void _zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id,
 486                                  u32 act_status)
 487 {
 488         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 489         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 490
 491         zfcp_erp_lun_block(sdev, clear);
 492
 493         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter,
 494                                 zfcp_sdev->port, sdev, id, act_status);
 495 }
 496
 497 /**
 498  * zfcp_erp_lun_reopen - initiate reopen of a LUN
 499  * @sdev: SCSI device / LUN to be reopened
 500  * @clear_mask: specifies flags in LUN status to be cleared
 501  * @id: Id for debug trace event.
 502  *
 503  * Return: 0 on success, < 0 on error
 504  */
 505 void zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id)
 506 {
 507         unsigned long flags;
 508         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 509         struct zfcp_port *port = zfcp_sdev->port;
 510         struct zfcp_adapter *adapter = port->adapter;
 511
 512         write_lock_irqsave(&adapter->erp_lock, flags);
 513         _zfcp_erp_lun_reopen(sdev, clear, id, 0);
 514         write_unlock_irqrestore(&adapter->erp_lock, flags);
 515 }
 516
 517 /**
 518  * zfcp_erp_lun_shutdown - Shutdown LUN
 519  * @sdev: SCSI device / LUN to shut down.
 520  * @clear: Status flags to clear.
 521  * @id: Id for debug trace event.
 522  */
 523 void zfcp_erp_lun_shutdown(struct scsi_device *sdev, int clear, char *id)
 524 {
 525         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 526         zfcp_erp_lun_reopen(sdev, clear | flags, id);
 527 }
 528
 529 /**
 530  * zfcp_erp_lun_shutdown_wait - Shutdown LUN and wait for erp completion
 531  * @sdev: SCSI device / LUN to shut down.
 532  * @id: Id for debug trace event.
 533  *
 534  * Do not acquire a reference for the LUN when creating the ERP
 535  * action. It is safe, because this function waits for the ERP to
 536  * complete first. This allows to shutdown the LUN, even when the SCSI
 537  * device is in the state SDEV_DEL when scsi_device_get will fail.
 538  */
 539 void zfcp_erp_lun_shutdown_wait(struct scsi_device *sdev, char *id)
 540 {
 541         unsigned long flags;
 542         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 543         struct zfcp_port *port = zfcp_sdev->port;
 544         struct zfcp_adapter *adapter = port->adapter;
 545         int clear = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 546
 547         write_lock_irqsave(&adapter->erp_lock, flags);
 548         _zfcp_erp_lun_reopen(sdev, clear, id, ZFCP_STATUS_ERP_NO_REF);
 549         write_unlock_irqrestore(&adapter->erp_lock, flags);
 550
 551         zfcp_erp_wait(adapter);
 552 }
 553
 554 static int status_change_set(unsigned long mask, atomic_t *status)
 555 {
 556         return (atomic_read(status) ^ mask) & mask;
 557 }
 558
 559 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 560 {
 561         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 562                 zfcp_dbf_rec_run("eraubl1", &adapter->erp_action);
 563         atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 564 }
 565
 566 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 567 {
 568         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 569                 zfcp_dbf_rec_run("erpubl1", &port->erp_action);
 570         atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 571 }
 572
 573 static void zfcp_erp_lun_unblock(struct scsi_device *sdev)
 574 {
 575         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 576
 577         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status))
 578                 zfcp_dbf_rec_run("erlubl1", &sdev_to_zfcp(sdev)->erp_action);
 579         atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status);
 580 }
 581
 582 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 583 {
 584         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 585         zfcp_dbf_rec_run("erator1", erp_action);
 586 }
 587
 588 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 589 {
 590         struct zfcp_adapter *adapter = act->adapter;
 591         struct zfcp_fsf_req *req;
 592
 593         if (!act->fsf_req_id)
 594                 return;
 595
 596         spin_lock(&adapter->req_list->lock);
 597         req = _zfcp_reqlist_find(adapter->req_list, act->fsf_req_id);
 598         if (req && req->erp_action == act) {
 599                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 600                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 601                         req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 602                         zfcp_dbf_rec_run("erscf_1", act);
 603                         req->erp_action = NULL;
 604                 }
 605                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 606                         zfcp_dbf_rec_run("erscf_2", act);
 607                 if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
 608                         act->fsf_req_id = 0;
 609         } else
 610                 act->fsf_req_id = 0;
 611         spin_unlock(&adapter->req_list->lock);
 612 }
 613
 614 /**
 615  * zfcp_erp_notify - Trigger ERP action.
 616  * @erp_action: ERP action to continue.
 617  * @set_mask: ERP action status flags to set.
 618  */
 619 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 620 {
 621         struct zfcp_adapter *adapter = erp_action->adapter;
 622         unsigned long flags;
 623
 624         write_lock_irqsave(&adapter->erp_lock, flags);
 625         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 626                 erp_action->status |= set_mask;
 627                 zfcp_erp_action_ready(erp_action);
 628         }
 629         write_unlock_irqrestore(&adapter->erp_lock, flags);
 630 }
 631
 632 /**
 633  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 634  * @data: ERP action (from timer data)
 635  */
 636 void zfcp_erp_timeout_handler(struct timer_list *t)
 637 {
 638         struct zfcp_fsf_req *fsf_req = from_timer(fsf_req, t, timer);
 639         struct zfcp_erp_action *act = fsf_req->erp_action;
 640
 641         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 642 }
 643
 644 static void zfcp_erp_memwait_handler(struct timer_list *t)
 645 {
 646         struct zfcp_erp_action *act = from_timer(act, t, timer);
 647
 648         zfcp_erp_notify(act, 0);
 649 }
 650
 651 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 652 {
 653         timer_setup(&erp_action->timer, zfcp_erp_memwait_handler, 0);
 654         erp_action->timer.expires = jiffies + HZ;
 655         add_timer(&erp_action->timer);
 656 }
 657
 658 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 659                                       int clear, char *id)
 660 {
 661         struct zfcp_port *port;
 662
 663         read_lock(&adapter->port_list_lock);
 664         list_for_each_entry(port, &adapter->port_list, list)
 665                 _zfcp_erp_port_reopen(port, clear, id);
 666         read_unlock(&adapter->port_list_lock);
 667 }
 668
 669 static void _zfcp_erp_lun_reopen_all(struct zfcp_port *port, int clear,
 670                                      char *id)
 671 {
 672         struct scsi_device *sdev;
 673
 674         spin_lock(port->adapter->scsi_host->host_lock);
 675         __shost_for_each_device(sdev, port->adapter->scsi_host)
 676                 if (sdev_to_zfcp(sdev)->port == port)
 677                         _zfcp_erp_lun_reopen(sdev, clear, id, 0);
 678         spin_unlock(port->adapter->scsi_host->host_lock);
 679 }
 680
 681 static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
 682 {
 683         switch (act->action) {
 684         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 685                 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1");
 686                 break;
 687         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 688                 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2");
 689                 break;
 690         case ZFCP_ERP_ACTION_REOPEN_PORT:
 691                 _zfcp_erp_port_reopen(act->port, 0, "ersff_3");
 692                 break;
 693         case ZFCP_ERP_ACTION_REOPEN_LUN:
 694                 _zfcp_erp_lun_reopen(act->sdev, 0, "ersff_4", 0);
 695                 break;
 696         }
 697 }
 698
 699 static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
 700 {
 701         switch (act->action) {
 702         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 703                 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1");
 704                 break;
 705         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 706                 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2");
 707                 break;
 708         case ZFCP_ERP_ACTION_REOPEN_PORT:
 709                 _zfcp_erp_lun_reopen_all(act->port, 0, "ersfs_3");
 710                 break;
 711         }
 712 }
 713
 714 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 715 {
 716         unsigned long flags;
 717
 718         read_lock_irqsave(&adapter->erp_lock, flags);
 719         if (list_empty(&adapter->erp_ready_head) &&
 720             list_empty(&adapter->erp_running_head)) {
 721                         atomic_andnot(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 722                                           &adapter->status);
 723                         wake_up(&adapter->erp_done_wqh);
 724         }
 725         read_unlock_irqrestore(&adapter->erp_lock, flags);
 726 }
 727
 728 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 729 {
 730         struct zfcp_port *port;
 731         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 732                                  adapter->peer_d_id);
 733         if (IS_ERR(port)) /* error or port already attached */
 734                 return;
 735         _zfcp_erp_port_reopen(port, 0, "ereptp1");
 736 }
 737
 738 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 739 {
 740         int retries;
 741         int sleep = 1;
 742         struct zfcp_adapter *adapter = erp_action->adapter;
 743
 744         atomic_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 745
 746         for (retries = 7; retries; retries--) {
 747                 atomic_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 748                                   &adapter->status);
 749                 write_lock_irq(&adapter->erp_lock);
 750                 zfcp_erp_action_to_running(erp_action);
 751                 write_unlock_irq(&adapter->erp_lock);
 752                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 753                         atomic_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 754                                           &adapter->status);
 755                         return ZFCP_ERP_FAILED;
 756                 }
 757
 758                 wait_event(adapter->erp_ready_wq,
 759                            !list_empty(&adapter->erp_ready_head));
 760                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 761                         break;
 762
 763                 if (!(atomic_read(&adapter->status) &
 764                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 765                         break;
 766
 767                 ssleep(sleep);
 768                 sleep *= 2;
 769         }
 770
 771         atomic_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 772                           &adapter->status);
 773
 774         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 775                 return ZFCP_ERP_FAILED;
 776
 777         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 778                 zfcp_erp_enqueue_ptp_port(adapter);
 779
 780         return ZFCP_ERP_SUCCEEDED;
 781 }
 782
 783 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 784 {
 785         int ret;
 786         struct zfcp_adapter *adapter = act->adapter;
 787
 788         write_lock_irq(&adapter->erp_lock);
 789         zfcp_erp_action_to_running(act);
 790         write_unlock_irq(&adapter->erp_lock);
 791
 792         ret = zfcp_fsf_exchange_port_data(act);
 793         if (ret == -EOPNOTSUPP)
 794                 return ZFCP_ERP_SUCCEEDED;
 795         if (ret)
 796                 return ZFCP_ERP_FAILED;
 797
 798         zfcp_dbf_rec_run("erasox1", act);
 799         wait_event(adapter->erp_ready_wq,
 800                    !list_empty(&adapter->erp_ready_head));
 801         zfcp_dbf_rec_run("erasox2", act);
 802         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 803                 return ZFCP_ERP_FAILED;
 804
 805         return ZFCP_ERP_SUCCEEDED;
 806 }
 807
 808 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 809 {
 810         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 811                 return ZFCP_ERP_FAILED;
 812
 813         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 814                 return ZFCP_ERP_FAILED;
 815
 816         if (mempool_resize(act->adapter->pool.sr_data,
 817                            act->adapter->stat_read_buf_num))
 818                 return ZFCP_ERP_FAILED;
 819
 820         if (mempool_resize(act->adapter->pool.status_read_req,
 821                            act->adapter->stat_read_buf_num))
 822                 return ZFCP_ERP_FAILED;
 823
 824         atomic_set(&act->adapter->stat_miss, act->adapter->stat_read_buf_num);
 825         if (zfcp_status_read_refill(act->adapter))
 826                 return ZFCP_ERP_FAILED;
 827
 828         return ZFCP_ERP_SUCCEEDED;
 829 }
 830
 831 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 832 {
 833         struct zfcp_adapter *adapter = act->adapter;
 834
 835         /* close queues to ensure that buffers are not accessed by adapter */
 836         zfcp_qdio_close(adapter->qdio);
 837         zfcp_fsf_req_dismiss_all(adapter);
 838         adapter->fsf_req_seq_no = 0;
 839         zfcp_fc_wka_ports_force_offline(adapter->gs);
 840         /* all ports and LUNs are closed */
 841         zfcp_erp_clear_adapter_status(adapter, ZFCP_STATUS_COMMON_OPEN);
 842
 843         atomic_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 844                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 845 }
 846
 847 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
 848 {
 849         struct zfcp_adapter *adapter = act->adapter;
 850
 851         if (zfcp_qdio_open(adapter->qdio)) {
 852                 atomic_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 853                                   ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 854                                   &adapter->status);
 855                 return ZFCP_ERP_FAILED;
 856         }
 857
 858         if (zfcp_erp_adapter_strategy_open_fsf(act)) {
 859                 zfcp_erp_adapter_strategy_close(act);
 860                 return ZFCP_ERP_FAILED;
 861         }
 862
 863         atomic_or(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
 864
 865         return ZFCP_ERP_SUCCEEDED;
 866 }
 867
 868 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 869 {
 870         struct zfcp_adapter *adapter = act->adapter;
 871
 872         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
 873                 zfcp_erp_adapter_strategy_close(act);
 874                 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 875                         return ZFCP_ERP_EXIT;
 876         }
 877
 878         if (zfcp_erp_adapter_strategy_open(act)) {
 879                 ssleep(8);
 880                 return ZFCP_ERP_FAILED;
 881         }
 882
 883         return ZFCP_ERP_SUCCEEDED;
 884 }
 885
 886 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 887 {
 888         int retval;
 889
 890         retval = zfcp_fsf_close_physical_port(act);
 891         if (retval == -ENOMEM)
 892                 return ZFCP_ERP_NOMEM;
 893         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 894         if (retval)
 895                 return ZFCP_ERP_FAILED;
 896
 897         return ZFCP_ERP_CONTINUES;
 898 }
 899
 900 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 901 {
 902         struct zfcp_port *port = erp_action->port;
 903         int status = atomic_read(&port->status);
 904
 905         switch (erp_action->step) {
 906         case ZFCP_ERP_STEP_UNINITIALIZED:
 907                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 908                     (status & ZFCP_STATUS_COMMON_OPEN))
 909                         return zfcp_erp_port_forced_strategy_close(erp_action);
 910                 else
 911                         return ZFCP_ERP_FAILED;
 912
 913         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 914                 if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
 915                         return ZFCP_ERP_SUCCEEDED;
 916         }
 917         return ZFCP_ERP_FAILED;
 918 }
 919
 920 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 921 {
 922         int retval;
 923
 924         retval = zfcp_fsf_close_port(erp_action);
 925         if (retval == -ENOMEM)
 926                 return ZFCP_ERP_NOMEM;
 927         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 928         if (retval)
 929                 return ZFCP_ERP_FAILED;
 930         return ZFCP_ERP_CONTINUES;
 931 }
 932
 933 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 934 {
 935         int retval;
 936
 937         retval = zfcp_fsf_open_port(erp_action);
 938         if (retval == -ENOMEM)
 939                 return ZFCP_ERP_NOMEM;
 940         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 941         if (retval)
 942                 return ZFCP_ERP_FAILED;
 943         return ZFCP_ERP_CONTINUES;
 944 }
 945
 946 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 947 {
 948         struct zfcp_adapter *adapter = act->adapter;
 949         struct zfcp_port *port = act->port;
 950
 951         if (port->wwpn != adapter->peer_wwpn) {
 952                 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 953                 return ZFCP_ERP_FAILED;
 954         }
 955         port->d_id = adapter->peer_d_id;
 956         return zfcp_erp_port_strategy_open_port(act);
 957 }
 958
 959 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 960 {
 961         struct zfcp_adapter *adapter = act->adapter;
 962         struct zfcp_port *port = act->port;
 963         int p_status = atomic_read(&port->status);
 964
 965         switch (act->step) {
 966         case ZFCP_ERP_STEP_UNINITIALIZED:
 967         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 968         case ZFCP_ERP_STEP_PORT_CLOSING:
 969                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 970                         return zfcp_erp_open_ptp_port(act);
 971                 if (!port->d_id) {
 972                         zfcp_fc_trigger_did_lookup(port);
 973                         return ZFCP_ERP_EXIT;
 974                 }
 975                 return zfcp_erp_port_strategy_open_port(act);
 976
 977         case ZFCP_ERP_STEP_PORT_OPENING:
 978                 /* D_ID might have changed during open */
 979                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 980                         if (!port->d_id) {
 981                                 zfcp_fc_trigger_did_lookup(port);
 982                                 return ZFCP_ERP_EXIT;
 983                         }
 984                         return ZFCP_ERP_SUCCEEDED;
 985                 }
 986                 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
 987                         port->d_id = 0;
 988                         return ZFCP_ERP_FAILED;
 989                 }
 990                 /* fall through otherwise */
 991         }
 992         return ZFCP_ERP_FAILED;
 993 }
 994
 995 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 996 {
 997         struct zfcp_port *port = erp_action->port;
 998         int p_status = atomic_read(&port->status);
 999
1000         if ((p_status & ZFCP_STATUS_COMMON_NOESC) &&
1001             !(p_status & ZFCP_STATUS_COMMON_OPEN))
1002                 goto close_init_done;
1003
1004         switch (erp_action->step) {
1005         case ZFCP_ERP_STEP_UNINITIALIZED:
1006                 if (p_status & ZFCP_STATUS_COMMON_OPEN)
1007                         return zfcp_erp_port_strategy_close(erp_action);
1008                 break;
1009
1010         case ZFCP_ERP_STEP_PORT_CLOSING:
1011                 if (p_status & ZFCP_STATUS_COMMON_OPEN)
1012                         return ZFCP_ERP_FAILED;
1013                 break;
1014         }
1015
1016 close_init_done:
1017         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
1018                 return ZFCP_ERP_EXIT;
1019
1020         return zfcp_erp_port_strategy_open_common(erp_action);
1021 }
1022
1023 static void zfcp_erp_lun_strategy_clearstati(struct scsi_device *sdev)
1024 {
1025         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1026
1027         atomic_andnot(ZFCP_STATUS_COMMON_ACCESS_DENIED,
1028                           &zfcp_sdev->status);
1029 }
1030
1031 static int zfcp_erp_lun_strategy_close(struct zfcp_erp_action *erp_action)
1032 {
1033         int retval = zfcp_fsf_close_lun(erp_action);
1034         if (retval == -ENOMEM)
1035                 return ZFCP_ERP_NOMEM;
1036         erp_action->step = ZFCP_ERP_STEP_LUN_CLOSING;
1037         if (retval)
1038                 return ZFCP_ERP_FAILED;
1039         return ZFCP_ERP_CONTINUES;
1040 }
1041
1042 static int zfcp_erp_lun_strategy_open(struct zfcp_erp_action *erp_action)
1043 {
1044         int retval = zfcp_fsf_open_lun(erp_action);
1045         if (retval == -ENOMEM)
1046                 return ZFCP_ERP_NOMEM;
1047         erp_action->step = ZFCP_ERP_STEP_LUN_OPENING;
1048         if (retval)
1049                 return  ZFCP_ERP_FAILED;
1050         return ZFCP_ERP_CONTINUES;
1051 }
1052
1053 static int zfcp_erp_lun_strategy(struct zfcp_erp_action *erp_action)
1054 {
1055         struct scsi_device *sdev = erp_action->sdev;
1056         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1057
1058         switch (erp_action->step) {
1059         case ZFCP_ERP_STEP_UNINITIALIZED:
1060                 zfcp_erp_lun_strategy_clearstati(sdev);
1061                 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
1062                         return zfcp_erp_lun_strategy_close(erp_action);
1063                 /* already closed, fall through */
1064         case ZFCP_ERP_STEP_LUN_CLOSING:
1065                 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
1066                         return ZFCP_ERP_FAILED;
1067                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
1068                         return ZFCP_ERP_EXIT;
1069                 return zfcp_erp_lun_strategy_open(erp_action);
1070
1071         case ZFCP_ERP_STEP_LUN_OPENING:
1072                 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
1073                         return ZFCP_ERP_SUCCEEDED;
1074         }
1075         return ZFCP_ERP_FAILED;
1076 }
1077
1078 static int zfcp_erp_strategy_check_lun(struct scsi_device *sdev, int result)
1079 {
1080         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1081
1082         switch (result) {
1083         case ZFCP_ERP_SUCCEEDED :
1084                 atomic_set(&zfcp_sdev->erp_counter, 0);
1085                 zfcp_erp_lun_unblock(sdev);
1086                 break;
1087         case ZFCP_ERP_FAILED :
1088                 atomic_inc(&zfcp_sdev->erp_counter);
1089                 if (atomic_read(&zfcp_sdev->erp_counter) > ZFCP_MAX_ERPS) {
1090                         dev_err(&zfcp_sdev->port->adapter->ccw_device->dev,
1091                                 "ERP failed for LUN 0x%016Lx on "
1092                                 "port 0x%016Lx\n",
1093                                 (unsigned long long)zfcp_scsi_dev_lun(sdev),
1094                                 (unsigned long long)zfcp_sdev->port->wwpn);
1095                         zfcp_erp_set_lun_status(sdev,
1096                                                 ZFCP_STATUS_COMMON_ERP_FAILED);
1097                 }
1098                 break;
1099         }
1100
1101         if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1102                 zfcp_erp_lun_block(sdev, 0);
1103                 result = ZFCP_ERP_EXIT;
1104         }
1105         return result;
1106 }
1107
1108 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1109 {
1110         switch (result) {
1111         case ZFCP_ERP_SUCCEEDED :
1112                 atomic_set(&port->erp_counter, 0);
1113                 zfcp_erp_port_unblock(port);
1114                 break;
1115
1116         case ZFCP_ERP_FAILED :
1117                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1118                         zfcp_erp_port_block(port, 0);
1119                         result = ZFCP_ERP_EXIT;
1120                 }
1121                 atomic_inc(&port->erp_counter);
1122                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1123                         dev_err(&port->adapter->ccw_device->dev,
1124                                 "ERP failed for remote port 0x%016Lx\n",
1125                                 (unsigned long long)port->wwpn);
1126                         zfcp_erp_set_port_status(port,
1127                                          ZFCP_STATUS_COMMON_ERP_FAILED);
1128                 }
1129                 break;
1130         }
1131
1132         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1133                 zfcp_erp_port_block(port, 0);
1134                 result = ZFCP_ERP_EXIT;
1135         }
1136         return result;
1137 }
1138
1139 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1140                                            int result)
1141 {
1142         switch (result) {
1143         case ZFCP_ERP_SUCCEEDED :
1144                 atomic_set(&adapter->erp_counter, 0);
1145                 zfcp_erp_adapter_unblock(adapter);
1146                 break;
1147
1148         case ZFCP_ERP_FAILED :
1149                 atomic_inc(&adapter->erp_counter);
1150                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1151                         dev_err(&adapter->ccw_device->dev,
1152                                 "ERP cannot recover an error "
1153                                 "on the FCP device\n");
1154                         zfcp_erp_set_adapter_status(adapter,
1155                                             ZFCP_STATUS_COMMON_ERP_FAILED);
1156                 }
1157                 break;
1158         }
1159
1160         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1161                 zfcp_erp_adapter_block(adapter, 0);
1162                 result = ZFCP_ERP_EXIT;
1163         }
1164         return result;
1165 }
1166
1167 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1168                                           int result)
1169 {
1170         struct zfcp_adapter *adapter = erp_action->adapter;
1171         struct zfcp_port *port = erp_action->port;
1172         struct scsi_device *sdev = erp_action->sdev;
1173
1174         switch (erp_action->action) {
1175
1176         case ZFCP_ERP_ACTION_REOPEN_LUN:
1177                 result = zfcp_erp_strategy_check_lun(sdev, result);
1178                 break;
1179
1180         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1181         case ZFCP_ERP_ACTION_REOPEN_PORT:
1182                 result = zfcp_erp_strategy_check_port(port, result);
1183                 break;
1184
1185         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1186                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1187                 break;
1188         }
1189         return result;
1190 }
1191
1192 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1193 {
1194         int status = atomic_read(target_status);
1195
1196         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1197             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1198                 return 1; /* take it online */
1199
1200         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1201             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1202                 return 1; /* take it offline */
1203
1204         return 0;
1205 }
1206
1207 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1208 {
1209         int action = act->action;
1210         struct zfcp_adapter *adapter = act->adapter;
1211         struct zfcp_port *port = act->port;
1212         struct scsi_device *sdev = act->sdev;
1213         struct zfcp_scsi_dev *zfcp_sdev;
1214         u32 erp_status = act->status;
1215
1216         switch (action) {
1217         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1218                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1219                         _zfcp_erp_adapter_reopen(adapter,
1220                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1221                                                  "ersscg1");
1222                         return ZFCP_ERP_EXIT;
1223                 }
1224                 break;
1225
1226         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1227         case ZFCP_ERP_ACTION_REOPEN_PORT:
1228                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1229                         _zfcp_erp_port_reopen(port,
1230                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1231                                               "ersscg2");
1232                         return ZFCP_ERP_EXIT;
1233                 }
1234                 break;
1235
1236         case ZFCP_ERP_ACTION_REOPEN_LUN:
1237                 zfcp_sdev = sdev_to_zfcp(sdev);
1238                 if (zfcp_erp_strat_change_det(&zfcp_sdev->status, erp_status)) {
1239                         _zfcp_erp_lun_reopen(sdev,
1240                                              ZFCP_STATUS_COMMON_ERP_FAILED,
1241                                              "ersscg3", 0);
1242                         return ZFCP_ERP_EXIT;
1243                 }
1244                 break;
1245         }
1246         return ret;
1247 }
1248
1249 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1250 {
1251         struct zfcp_adapter *adapter = erp_action->adapter;
1252         struct zfcp_scsi_dev *zfcp_sdev;
1253
1254         adapter->erp_total_count--;
1255         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1256                 adapter->erp_low_mem_count--;
1257                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1258         }
1259
1260         list_del(&erp_action->list);
1261         zfcp_dbf_rec_run("eractd1", erp_action);
1262
1263         switch (erp_action->action) {
1264         case ZFCP_ERP_ACTION_REOPEN_LUN:
1265                 zfcp_sdev = sdev_to_zfcp(erp_action->sdev);
1266                 atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE,
1267                                   &zfcp_sdev->status);
1268                 break;
1269
1270         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1271         case ZFCP_ERP_ACTION_REOPEN_PORT:
1272                 atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE,
1273                                   &erp_action->port->status);
1274                 break;
1275
1276         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1277                 atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE,
1278                                   &erp_action->adapter->status);
1279                 break;
1280         }
1281 }
1282
1283 /**
1284  * zfcp_erp_try_rport_unblock - unblock rport if no more/new recovery
1285  * @port: zfcp_port whose fc_rport we should try to unblock
1286  */
1287 static void zfcp_erp_try_rport_unblock(struct zfcp_port *port)
1288 {
1289         unsigned long flags;
1290         struct zfcp_adapter *adapter = port->adapter;
1291         int port_status;
1292         struct Scsi_Host *shost = adapter->scsi_host;
1293         struct scsi_device *sdev;
1294
1295         write_lock_irqsave(&adapter->erp_lock, flags);
1296         port_status = atomic_read(&port->status);
1297         if ((port_status & ZFCP_STATUS_COMMON_UNBLOCKED)    == 0 ||
1298             (port_status & (ZFCP_STATUS_COMMON_ERP_INUSE |
1299                             ZFCP_STATUS_COMMON_ERP_FAILED)) != 0) {
1300                 /* new ERP of severity >= port triggered elsewhere meanwhile or
1301                  * local link down (adapter erp_failed but not clear unblock)
1302                  */
1303                 zfcp_dbf_rec_run_lvl(4, "ertru_p", &port->erp_action);
1304                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1305                 return;
1306         }
1307         spin_lock(shost->host_lock);
1308         __shost_for_each_device(sdev, shost) {
1309                 struct zfcp_scsi_dev *zsdev = sdev_to_zfcp(sdev);
1310                 int lun_status;
1311
1312                 if (zsdev->port != port)
1313                         continue;
1314                 /* LUN under port of interest */
1315                 lun_status = atomic_read(&zsdev->status);
1316                 if ((lun_status & ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
1317                         continue; /* unblock rport despite failed LUNs */
1318                 /* LUN recovery not given up yet [maybe follow-up pending] */
1319                 if ((lun_status & ZFCP_STATUS_COMMON_UNBLOCKED) == 0 ||
1320                     (lun_status & ZFCP_STATUS_COMMON_ERP_INUSE) != 0) {
1321                         /* LUN blocked:
1322                          * not yet unblocked [LUN recovery pending]
1323                          * or meanwhile blocked [new LUN recovery triggered]
1324                          */
1325                         zfcp_dbf_rec_run_lvl(4, "ertru_l", &zsdev->erp_action);
1326                         spin_unlock(shost->host_lock);
1327                         write_unlock_irqrestore(&adapter->erp_lock, flags);
1328                         return;
1329                 }
1330         }
1331         /* now port has no child or all children have completed recovery,
1332          * and no ERP of severity >= port was meanwhile triggered elsewhere
1333          */
1334         zfcp_scsi_schedule_rport_register(port);
1335         spin_unlock(shost->host_lock);
1336         write_unlock_irqrestore(&adapter->erp_lock, flags);
1337 }
1338
1339 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1340 {
1341         struct zfcp_adapter *adapter = act->adapter;
1342         struct zfcp_port *port = act->port;
1343         struct scsi_device *sdev = act->sdev;
1344
1345         switch (act->action) {
1346         case ZFCP_ERP_ACTION_REOPEN_LUN:
1347                 if (!(act->status & ZFCP_STATUS_ERP_NO_REF))
1348                         scsi_device_put(sdev);
1349                 zfcp_erp_try_rport_unblock(port);
1350                 break;
1351
1352         case ZFCP_ERP_ACTION_REOPEN_PORT:
1353                 /* This switch case might also happen after a forced reopen
1354                  * was successfully done and thus overwritten with a new
1355                  * non-forced reopen at `ersfs_2'. In this case, we must not
1356                  * do the clean-up of the non-forced version.
1357                  */
1358                 if (act->step != ZFCP_ERP_STEP_UNINITIALIZED)
1359                         if (result == ZFCP_ERP_SUCCEEDED)
1360                                 zfcp_erp_try_rport_unblock(port);
1361                 /* fall through */
1362         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1363                 put_device(&port->dev);
1364                 break;
1365
1366         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1367                 if (result == ZFCP_ERP_SUCCEEDED) {
1368                         register_service_level(&adapter->service_level);
1369                         zfcp_fc_conditional_port_scan(adapter);
1370                         queue_work(adapter->work_queue, &adapter->ns_up_work);
1371                 } else
1372                         unregister_service_level(&adapter->service_level);
1373
1374                 kref_put(&adapter->ref, zfcp_adapter_release);
1375                 break;
1376         }
1377 }
1378
1379 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1380 {
1381         switch (erp_action->action) {
1382         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1383                 return zfcp_erp_adapter_strategy(erp_action);
1384         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1385                 return zfcp_erp_port_forced_strategy(erp_action);
1386         case ZFCP_ERP_ACTION_REOPEN_PORT:
1387                 return zfcp_erp_port_strategy(erp_action);
1388         case ZFCP_ERP_ACTION_REOPEN_LUN:
1389                 return zfcp_erp_lun_strategy(erp_action);
1390         }
1391         return ZFCP_ERP_FAILED;
1392 }
1393
1394 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1395 {
1396         int retval;
1397         unsigned long flags;
1398         struct zfcp_adapter *adapter = erp_action->adapter;
1399
1400         kref_get(&adapter->ref);
1401
1402         write_lock_irqsave(&adapter->erp_lock, flags);
1403         zfcp_erp_strategy_check_fsfreq(erp_action);
1404
1405         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1406                 zfcp_erp_action_dequeue(erp_action);
1407                 retval = ZFCP_ERP_DISMISSED;
1408                 goto unlock;
1409         }
1410
1411         if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
1412                 retval = ZFCP_ERP_FAILED;
1413                 goto check_target;
1414         }
1415
1416         zfcp_erp_action_to_running(erp_action);
1417
1418         /* no lock to allow for blocking operations */
1419         write_unlock_irqrestore(&adapter->erp_lock, flags);
1420         retval = zfcp_erp_strategy_do_action(erp_action);
1421         write_lock_irqsave(&adapter->erp_lock, flags);
1422
1423         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1424                 retval = ZFCP_ERP_CONTINUES;
1425
1426         switch (retval) {
1427         case ZFCP_ERP_NOMEM:
1428                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1429                         ++adapter->erp_low_mem_count;
1430                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1431                 }
1432                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1433                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1");
1434                 else {
1435                         zfcp_erp_strategy_memwait(erp_action);
1436                         retval = ZFCP_ERP_CONTINUES;
1437                 }
1438                 goto unlock;
1439
1440         case ZFCP_ERP_CONTINUES:
1441                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1442                         --adapter->erp_low_mem_count;
1443                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1444                 }
1445                 goto unlock;
1446         }
1447
1448 check_target:
1449         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1450         zfcp_erp_action_dequeue(erp_action);
1451         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1452         if (retval == ZFCP_ERP_EXIT)
1453                 goto unlock;
1454         if (retval == ZFCP_ERP_SUCCEEDED)
1455                 zfcp_erp_strategy_followup_success(erp_action);
1456         if (retval == ZFCP_ERP_FAILED)
1457                 zfcp_erp_strategy_followup_failed(erp_action);
1458
1459  unlock:
1460         write_unlock_irqrestore(&adapter->erp_lock, flags);
1461
1462         if (retval != ZFCP_ERP_CONTINUES)
1463                 zfcp_erp_action_cleanup(erp_action, retval);
1464
1465         kref_put(&adapter->ref, zfcp_adapter_release);
1466         return retval;
1467 }
1468
1469 static int zfcp_erp_thread(void *data)
1470 {
1471         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1472         struct list_head *next;
1473         struct zfcp_erp_action *act;
1474         unsigned long flags;
1475
1476         for (;;) {
1477                 wait_event_interruptible(adapter->erp_ready_wq,
1478                            !list_empty(&adapter->erp_ready_head) ||
1479                            kthread_should_stop());
1480
1481                 if (kthread_should_stop())
1482                         break;
1483
1484                 write_lock_irqsave(&adapter->erp_lock, flags);
1485                 next = adapter->erp_ready_head.next;
1486                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1487
1488                 if (next != &adapter->erp_ready_head) {
1489                         act = list_entry(next, struct zfcp_erp_action, list);
1490
1491                         /* there is more to come after dismission, no notify */
1492                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1493                                 zfcp_erp_wakeup(adapter);
1494                 }
1495         }
1496
1497         return 0;
1498 }
1499
1500 /**
1501  * zfcp_erp_thread_setup - Start ERP thread for adapter
1502  * @adapter: Adapter to start the ERP thread for
1503  *
1504  * Returns 0 on success or error code from kernel_thread()
1505  */
1506 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1507 {
1508         struct task_struct *thread;
1509
1510         thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
1511                              dev_name(&adapter->ccw_device->dev));
1512         if (IS_ERR(thread)) {
1513                 dev_err(&adapter->ccw_device->dev,
1514                         "Creating an ERP thread for the FCP device failed.\n");
1515                 return PTR_ERR(thread);
1516         }
1517
1518         adapter->erp_thread = thread;
1519         return 0;
1520 }
1521
1522 /**
1523  * zfcp_erp_thread_kill - Stop ERP thread.
1524  * @adapter: Adapter where the ERP thread should be stopped.
1525  *
1526  * The caller of this routine ensures that the specified adapter has
1527  * been shut down and that this operation has been completed. Thus,
1528  * there are no pending erp_actions which would need to be handled
1529  * here.
1530  */
1531 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1532 {
1533         kthread_stop(adapter->erp_thread);
1534         adapter->erp_thread = NULL;
1535         WARN_ON(!list_empty(&adapter->erp_ready_head));
1536         WARN_ON(!list_empty(&adapter->erp_running_head));
1537 }
1538
1539 /**
1540  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1541  * @adapter: adapter for which to wait for completion of its error recovery
1542  */
1543 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1544 {
1545         wait_event(adapter->erp_done_wqh,
1546                    !(atomic_read(&adapter->status) &
1547                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1548 }
1549
1550 /**
1551  * zfcp_erp_set_adapter_status - set adapter status bits
1552  * @adapter: adapter to change the status
1553  * @mask: status bits to change
1554  *
1555  * Changes in common status bits are propagated to attached ports and LUNs.
1556  */
1557 void zfcp_erp_set_adapter_status(struct zfcp_adapter *adapter, u32 mask)
1558 {
1559         struct zfcp_port *port;
1560         struct scsi_device *sdev;
1561         unsigned long flags;
1562         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1563
1564         atomic_or(mask, &adapter->status);
1565
1566         if (!common_mask)
1567                 return;
1568
1569         read_lock_irqsave(&adapter->port_list_lock, flags);
1570         list_for_each_entry(port, &adapter->port_list, list)
1571                 atomic_or(common_mask, &port->status);
1572         read_unlock_irqrestore(&adapter->port_list_lock, flags);
1573
1574         spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
1575         __shost_for_each_device(sdev, adapter->scsi_host)
1576                 atomic_or(common_mask, &sdev_to_zfcp(sdev)->status);
1577         spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
1578 }
1579
1580 /**
1581  * zfcp_erp_clear_adapter_status - clear adapter status bits
1582  * @adapter: adapter to change the status
1583  * @mask: status bits to change
1584  *
1585  * Changes in common status bits are propagated to attached ports and LUNs.
1586  */
1587 void zfcp_erp_clear_adapter_status(struct zfcp_adapter *adapter, u32 mask)
1588 {
1589         struct zfcp_port *port;
1590         struct scsi_device *sdev;
1591         unsigned long flags;
1592         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1593         u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
1594
1595         atomic_andnot(mask, &adapter->status);
1596
1597         if (!common_mask)
1598                 return;
1599
1600         if (clear_counter)
1601                 atomic_set(&adapter->erp_counter, 0);
1602
1603         read_lock_irqsave(&adapter->port_list_lock, flags);
1604         list_for_each_entry(port, &adapter->port_list, list) {
1605                 atomic_andnot(common_mask, &port->status);
1606                 if (clear_counter)
1607                         atomic_set(&port->erp_counter, 0);
1608         }
1609         read_unlock_irqrestore(&adapter->port_list_lock, flags);
1610
1611         spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
1612         __shost_for_each_device(sdev, adapter->scsi_host) {
1613                 atomic_andnot(common_mask, &sdev_to_zfcp(sdev)->status);
1614                 if (clear_counter)
1615                         atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
1616         }
1617         spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
1618 }
1619
1620 /**
1621  * zfcp_erp_set_port_status - set port status bits
1622  * @port: port to change the status
1623  * @mask: status bits to change
1624  *
1625  * Changes in common status bits are propagated to attached LUNs.
1626  */
1627 void zfcp_erp_set_port_status(struct zfcp_port *port, u32 mask)
1628 {
1629         struct scsi_device *sdev;
1630         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1631         unsigned long flags;
1632
1633         atomic_or(mask, &port->status);
1634
1635         if (!common_mask)
1636                 return;
1637
1638         spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
1639         __shost_for_each_device(sdev, port->adapter->scsi_host)
1640                 if (sdev_to_zfcp(sdev)->port == port)
1641                         atomic_or(common_mask,
1642                                         &sdev_to_zfcp(sdev)->status);
1643         spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
1644 }
1645
1646 /**
1647  * zfcp_erp_clear_port_status - clear port status bits
1648  * @port: adapter to change the status
1649  * @mask: status bits to change
1650  *
1651  * Changes in common status bits are propagated to attached LUNs.
1652  */
1653 void zfcp_erp_clear_port_status(struct zfcp_port *port, u32 mask)
1654 {
1655         struct scsi_device *sdev;
1656         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1657         u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
1658         unsigned long flags;
1659
1660         atomic_andnot(mask, &port->status);
1661
1662         if (!common_mask)
1663                 return;
1664
1665         if (clear_counter)
1666                 atomic_set(&port->erp_counter, 0);
1667
1668         spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
1669         __shost_for_each_device(sdev, port->adapter->scsi_host)
1670                 if (sdev_to_zfcp(sdev)->port == port) {
1671                         atomic_andnot(common_mask,
1672                                           &sdev_to_zfcp(sdev)->status);
1673                         if (clear_counter)
1674                                 atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
1675                 }
1676         spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
1677 }
1678
1679 /**
1680  * zfcp_erp_set_lun_status - set lun status bits
1681  * @sdev: SCSI device / lun to set the status bits
1682  * @mask: status bits to change
1683  */
1684 void zfcp_erp_set_lun_status(struct scsi_device *sdev, u32 mask)
1685 {
1686         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1687
1688         atomic_or(mask, &zfcp_sdev->status);
1689 }
1690
1691 /**
1692  * zfcp_erp_clear_lun_status - clear lun status bits
1693  * @sdev: SCSi device / lun to clear the status bits
1694  * @mask: status bits to change
1695  */
1696 void zfcp_erp_clear_lun_status(struct scsi_device *sdev, u32 mask)
1697 {
1698         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1699
1700         atomic_andnot(mask, &zfcp_sdev->status);
1701
1702         if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1703                 atomic_set(&zfcp_sdev->erp_counter, 0);
1704 }
1705