drivers/s390/scsi/zfcp_erp.c

   1 /*
   2  *
   3  * linux/drivers/s390/scsi/zfcp_erp.c
   4  *
   5  * FCP adapter driver for IBM eServer zSeries
   6  *
   7  * (C) Copyright IBM Corp. 2002, 2004
   8  *
   9  * Author(s): Martin Peschke <mpeschke@de.ibm.com>
  10  *            Raimund Schroeder <raimund.schroeder@de.ibm.com>
  11  *            Aron Zeh
  12  *            Wolfgang Taphorn
  13  *            Stefan Bader <stefan.bader@de.ibm.com>
  14  *            Heiko Carstens <heiko.carstens@de.ibm.com>
  15  *            Andreas Herrmann <aherrman@de.ibm.com>
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2, or (at your option)
  20  * any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_ERP
  33
  34 #define ZFCP_ERP_REVISION "$Revision: 1.86 $"
  35
  36 #include "zfcp_ext.h"
  37
  38 static int zfcp_erp_adisc(struct zfcp_adapter *, fc_id_t);
  39 static void zfcp_erp_adisc_handler(unsigned long);
  40
  41 static int zfcp_erp_adapter_reopen_internal(struct zfcp_adapter *, int);
  42 static int zfcp_erp_port_forced_reopen_internal(struct zfcp_port *, int);
  43 static int zfcp_erp_port_reopen_internal(struct zfcp_port *, int);
  44 static int zfcp_erp_unit_reopen_internal(struct zfcp_unit *, int);
  45
  46 static int zfcp_erp_port_reopen_all_internal(struct zfcp_adapter *, int);
  47 static int zfcp_erp_unit_reopen_all_internal(struct zfcp_port *, int);
  48
  49 static void zfcp_erp_adapter_block(struct zfcp_adapter *, int);
  50 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *);
  51 static void zfcp_erp_port_block(struct zfcp_port *, int);
  52 static void zfcp_erp_port_unblock(struct zfcp_port *);
  53 static void zfcp_erp_unit_block(struct zfcp_unit *, int);
  54 static void zfcp_erp_unit_unblock(struct zfcp_unit *);
  55
  56 static int zfcp_erp_thread(void *);
  57
  58 static int zfcp_erp_strategy(struct zfcp_erp_action *);
  59
  60 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *);
  61 static int zfcp_erp_strategy_memwait(struct zfcp_erp_action *);
  62 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *, int);
  63 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *, int);
  64 static int zfcp_erp_strategy_check_port(struct zfcp_port *, int);
  65 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *, int);
  66 static int zfcp_erp_strategy_statechange(int, u32, struct zfcp_adapter *,
  67                                          struct zfcp_port *,
  68                                          struct zfcp_unit *, int);
  69 static inline int zfcp_erp_strategy_statechange_detected(atomic_t *, u32);
  70 static int zfcp_erp_strategy_followup_actions(int, struct zfcp_adapter *,
  71                                               struct zfcp_port *,
  72                                               struct zfcp_unit *, int);
  73 static int zfcp_erp_strategy_check_queues(struct zfcp_adapter *);
  74 static int zfcp_erp_strategy_check_action(struct zfcp_erp_action *, int);
  75
  76 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *);
  77 static int zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *, int);
  78 static int zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *);
  79 static int zfcp_erp_adapter_strategy_close_qdio(struct zfcp_erp_action *);
  80 static int zfcp_erp_adapter_strategy_close_fsf(struct zfcp_erp_action *);
  81 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *);
  82 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *);
  83 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *);
  84 static int zfcp_erp_adapter_strategy_open_fsf_xconfig(struct zfcp_erp_action *);
  85 static int zfcp_erp_adapter_strategy_open_fsf_statusread(
  86         struct zfcp_erp_action *);
  87
  88 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *);
  89 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *);
  90
  91 static int zfcp_erp_port_strategy(struct zfcp_erp_action *);
  92 static int zfcp_erp_port_strategy_clearstati(struct zfcp_port *);
  93 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *);
  94 static int zfcp_erp_port_strategy_open(struct zfcp_erp_action *);
  95 static int zfcp_erp_port_strategy_open_nameserver(struct zfcp_erp_action *);
  96 static int zfcp_erp_port_strategy_open_nameserver_wakeup(
  97         struct zfcp_erp_action *);
  98 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *);
  99 static int zfcp_erp_port_strategy_open_common_lookup(struct zfcp_erp_action *);
 100 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *);
 101
 102 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *);
 103 static int zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *);
 104 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *);
 105 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *);
 106
 107 static int zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *);
 108 static int zfcp_erp_action_dismiss_port(struct zfcp_port *);
 109 static int zfcp_erp_action_dismiss_unit(struct zfcp_unit *);
 110 static int zfcp_erp_action_dismiss(struct zfcp_erp_action *);
 111
 112 static int zfcp_erp_action_enqueue(int, struct zfcp_adapter *,
 113                                    struct zfcp_port *, struct zfcp_unit *);
 114 static int zfcp_erp_action_dequeue(struct zfcp_erp_action *);
 115 static void zfcp_erp_action_cleanup(int, struct zfcp_adapter *,
 116                                     struct zfcp_port *, struct zfcp_unit *,
 117                                     int);
 118
 119 static void zfcp_erp_action_ready(struct zfcp_erp_action *);
 120 static int  zfcp_erp_action_exists(struct zfcp_erp_action *);
 121
 122 static inline void zfcp_erp_action_to_ready(struct zfcp_erp_action *);
 123 static inline void zfcp_erp_action_to_running(struct zfcp_erp_action *);
 124
 125 static void zfcp_erp_memwait_handler(unsigned long);
 126 static void zfcp_erp_timeout_handler(unsigned long);
 127 static inline void zfcp_erp_timeout_init(struct zfcp_erp_action *);
 128
 129 /**
 130  * zfcp_fsf_request_timeout_handler - called if a request timed out
 131  * @data: pointer to adapter for handler function
 132  *
 133  * This function needs to be called if requests (ELS, Generic Service,
 134  * or SCSI commands) exceed a certain time limit. The assumption is
 135  * that after the time limit the adapter get stuck. So we trigger a reopen of
 136  * the adapter. This should not be used for error recovery, SCSI abort
 137  * commands and SCSI requests from SCSI mid-layer.
 138  */
 139 void
 140 zfcp_fsf_request_timeout_handler(unsigned long data)
 141 {
 142         struct zfcp_adapter *adapter;
 143
 144         adapter = (struct zfcp_adapter *) data;
 145
 146         zfcp_erp_adapter_reopen(adapter, 0);
 147 }
 148
 149 /*
 150  * function:    zfcp_fsf_scsi_er_timeout_handler
 151  *
 152  * purpose:     This function needs to be called whenever a SCSI error recovery
 153  *              action (abort/reset) does not return.
 154  *              Re-opening the adapter means that the command can be returned
 155  *              by zfcp (it is guarranteed that it does not return via the
 156  *              adapter anymore). The buffer can then be used again.
 157  *
 158  * returns:     sod all
 159  */
 160 void
 161 zfcp_fsf_scsi_er_timeout_handler(unsigned long data)
 162 {
 163         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
 164
 165         ZFCP_LOG_NORMAL("warning: SCSI error recovery timed out. "
 166                         "Restarting all operations on the adapter %s\n",
 167                         zfcp_get_busid_by_adapter(adapter));
 168         debug_text_event(adapter->erp_dbf, 1, "eh_lmem_tout");
 169         zfcp_erp_adapter_reopen(adapter, 0);
 170
 171         return;
 172 }
 173
 174 /*
 175  * function:
 176  *
 177  * purpose:     called if an adapter failed,
 178  *              initiates adapter recovery which is done
 179  *              asynchronously
 180  *
 181  * returns:     0       - initiated action succesfully
 182  *              <0      - failed to initiate action
 183  */
 184 int
 185 zfcp_erp_adapter_reopen_internal(struct zfcp_adapter *adapter, int clear_mask)
 186 {
 187         int retval;
 188
 189         debug_text_event(adapter->erp_dbf, 5, "a_ro");
 190         ZFCP_LOG_DEBUG("reopen adapter %s\n",
 191                        zfcp_get_busid_by_adapter(adapter));
 192
 193         zfcp_erp_adapter_block(adapter, clear_mask);
 194
 195         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) {
 196                 ZFCP_LOG_DEBUG("skipped reopen of failed adapter %s\n",
 197                                zfcp_get_busid_by_adapter(adapter));
 198                 debug_text_event(adapter->erp_dbf, 5, "a_ro_f");
 199                 /* ensure propagation of failed status to new devices */
 200                 zfcp_erp_adapter_failed(adapter);
 201                 retval = -EIO;
 202                 goto out;
 203         }
 204         retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 205                                          adapter, NULL, NULL);
 206
 207  out:
 208         return retval;
 209 }
 210
 211 /*
 212  * function:
 213  *
 214  * purpose:     Wrappper for zfcp_erp_adapter_reopen_internal
 215  *              used to ensure the correct locking
 216  *
 217  * returns:     0       - initiated action succesfully
 218  *              <0      - failed to initiate action
 219  */
 220 int
 221 zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear_mask)
 222 {
 223         int retval;
 224         unsigned long flags;
 225
 226         read_lock_irqsave(&zfcp_data.config_lock, flags);
 227         write_lock(&adapter->erp_lock);
 228         retval = zfcp_erp_adapter_reopen_internal(adapter, clear_mask);
 229         write_unlock(&adapter->erp_lock);
 230         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 231
 232         return retval;
 233 }
 234
 235 /*
 236  * function:
 237  *
 238  * purpose:
 239  *
 240  * returns:
 241  */
 242 int
 243 zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear_mask)
 244 {
 245         int retval;
 246
 247         retval = zfcp_erp_adapter_reopen(adapter,
 248                                          ZFCP_STATUS_COMMON_RUNNING |
 249                                          ZFCP_STATUS_COMMON_ERP_FAILED |
 250                                          clear_mask);
 251
 252         return retval;
 253 }
 254
 255 /*
 256  * function:
 257  *
 258  * purpose:
 259  *
 260  * returns:
 261  */
 262 int
 263 zfcp_erp_port_shutdown(struct zfcp_port *port, int clear_mask)
 264 {
 265         int retval;
 266
 267         retval = zfcp_erp_port_reopen(port,
 268                                       ZFCP_STATUS_COMMON_RUNNING |
 269                                       ZFCP_STATUS_COMMON_ERP_FAILED |
 270                                       clear_mask);
 271
 272         return retval;
 273 }
 274
 275 /*
 276  * function:
 277  *
 278  * purpose:
 279  *
 280  * returns:
 281  */
 282 int
 283 zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear_mask)
 284 {
 285         int retval;
 286
 287         retval = zfcp_erp_unit_reopen(unit,
 288                                       ZFCP_STATUS_COMMON_RUNNING |
 289                                       ZFCP_STATUS_COMMON_ERP_FAILED |
 290                                       clear_mask);
 291
 292         return retval;
 293 }
 294
 295
 296 /**
 297  * zfcp_erp_adisc - send ADISC ELS command
 298  * @adapter: adapter structure
 299  * @d_id: d_id of port where ADISC is sent to
 300  */
 301 int
 302 zfcp_erp_adisc(struct zfcp_adapter *adapter, fc_id_t d_id)
 303 {
 304         struct zfcp_send_els *send_els;
 305         struct zfcp_ls_adisc *adisc;
 306         void *address = NULL;
 307         int retval = 0;
 308         struct timer_list *timer;
 309
 310         send_els = kmalloc(sizeof(struct zfcp_send_els), GFP_ATOMIC);
 311         if (send_els == NULL)
 312                 goto nomem;
 313         memset(send_els, 0, sizeof(*send_els));
 314
 315         send_els->req = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC);
 316         if (send_els->req == NULL)
 317                 goto nomem;
 318         memset(send_els->req, 0, sizeof(*send_els->req));
 319
 320         send_els->resp = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC);
 321         if (send_els->resp == NULL)
 322                 goto nomem;
 323         memset(send_els->resp, 0, sizeof(*send_els->resp));
 324
 325         address = (void *) get_zeroed_page(GFP_ATOMIC);
 326         if (address == NULL)
 327                 goto nomem;
 328
 329         zfcp_address_to_sg(address, send_els->req);
 330         address += PAGE_SIZE >> 1;
 331         zfcp_address_to_sg(address, send_els->resp);
 332         send_els->req_count = send_els->resp_count = 1;
 333
 334         send_els->adapter = adapter;
 335         send_els->d_id = d_id;
 336         send_els->handler = zfcp_erp_adisc_handler;
 337         send_els->handler_data = (unsigned long) send_els;
 338
 339         adisc = zfcp_sg_to_address(send_els->req);
 340         send_els->ls_code = adisc->code = ZFCP_LS_ADISC;
 341
 342         send_els->req->length = sizeof(struct zfcp_ls_adisc);
 343         send_els->resp->length = sizeof(struct zfcp_ls_adisc_acc);
 344
 345         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 346            without FC-AL-2 capability, so we don't set it */
 347         adisc->wwpn = adapter->wwpn;
 348         adisc->wwnn = adapter->wwnn;
 349         adisc->nport_id = adapter->s_id;
 350         ZFCP_LOG_INFO("ADISC request from s_id 0x%08x to d_id 0x%08x "
 351                       "(wwpn=0x%016Lx, wwnn=0x%016Lx, "
 352                       "hard_nport_id=0x%08x, nport_id=0x%08x)\n",
 353                       adapter->s_id, d_id, (wwn_t) adisc->wwpn,
 354                       (wwn_t) adisc->wwnn, adisc->hard_nport_id,
 355                       adisc->nport_id);
 356
 357         timer = kmalloc(sizeof(struct timer_list), GFP_ATOMIC);
 358         if (!timer)
 359                 goto nomem;
 360
 361         init_timer(timer);
 362         timer->function = zfcp_fsf_request_timeout_handler;
 363         timer->data = (unsigned long) adapter;
 364         timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;
 365         send_els->timer = timer;
 366
 367         retval = zfcp_fsf_send_els(send_els);
 368         if (retval != 0) {
 369                 ZFCP_LOG_NORMAL("error: initiation of Send ELS failed for port "
 370                                 "0x%08x on adapter %s\n", d_id,
 371                                 zfcp_get_busid_by_adapter(adapter));
 372                 del_timer(send_els->timer);
 373                 goto freemem;
 374         }
 375
 376         goto out;
 377
 378  nomem:
 379         retval = -ENOMEM;
 380  freemem:
 381         if (address != NULL)
 382                 __free_pages(send_els->req->page, 0);
 383         if (send_els != NULL) {
 384                 kfree(send_els->timer);
 385                 kfree(send_els->req);
 386                 kfree(send_els->resp);
 387                 kfree(send_els);
 388         }
 389  out:
 390         return retval;
 391 }
 392
 393
 394 /**
 395  * zfcp_erp_adisc_handler - handler for ADISC ELS command
 396  * @data: pointer to struct zfcp_send_els
 397  *
 398  * If ADISC failed (LS_RJT or timed out) forced reopen of the port is triggered.
 399  */
 400 void
 401 zfcp_erp_adisc_handler(unsigned long data)
 402 {
 403         struct zfcp_send_els *send_els;
 404         struct zfcp_port *port;
 405         struct zfcp_adapter *adapter;
 406         fc_id_t d_id;
 407         struct zfcp_ls_adisc_acc *adisc;
 408
 409         send_els = (struct zfcp_send_els *) data;
 410
 411         del_timer(send_els->timer);
 412
 413         adapter = send_els->adapter;
 414         d_id = send_els->d_id;
 415
 416         read_lock(&zfcp_data.config_lock);
 417         port = zfcp_get_port_by_did(send_els->adapter, send_els->d_id);
 418         read_unlock(&zfcp_data.config_lock);
 419
 420         BUG_ON(port == NULL);
 421
 422         /* request rejected or timed out */
 423         if (send_els->status != 0) {
 424                 ZFCP_LOG_NORMAL("ELS request rejected/timed out, "
 425                                 "force physical port reopen "
 426                                 "(adapter %s, port d_id=0x%08x)\n",
 427                                 zfcp_get_busid_by_adapter(adapter), d_id);
 428                 debug_text_event(adapter->erp_dbf, 3, "forcreop");
 429                 if (zfcp_erp_port_forced_reopen(port, 0))
 430                         ZFCP_LOG_NORMAL("failed reopen of port "
 431                                         "(adapter %s, wwpn=0x%016Lx)\n",
 432                                         zfcp_get_busid_by_port(port),
 433                                         port->wwpn);
 434                 goto out;
 435         }
 436
 437         adisc = zfcp_sg_to_address(send_els->resp);
 438
 439         ZFCP_LOG_INFO("ADISC response from d_id 0x%08x to s_id "
 440                       "0x%08x (wwpn=0x%016Lx, wwnn=0x%016Lx, "
 441                       "hard_nport_id=0x%08x, nport_id=0x%08x)\n",
 442                       d_id, adapter->s_id, (wwn_t) adisc->wwpn,
 443                       (wwn_t) adisc->wwnn, adisc->hard_nport_id,
 444                       adisc->nport_id);
 445
 446         /* set wwnn for port */
 447         if (port->wwnn == 0)
 448                 port->wwnn = adisc->wwnn;
 449
 450         if (port->wwpn != adisc->wwpn) {
 451                 ZFCP_LOG_NORMAL("d_id assignment changed, reopening "
 452                                 "port (adapter %s, wwpn=0x%016Lx, "
 453                                 "adisc_resp_wwpn=0x%016Lx)\n",
 454                                 zfcp_get_busid_by_port(port),
 455                                 port->wwpn, (wwn_t) adisc->wwpn);
 456                 if (zfcp_erp_port_reopen(port, 0))
 457                         ZFCP_LOG_NORMAL("failed reopen of port "
 458                                         "(adapter %s, wwpn=0x%016Lx)\n",
 459                                         zfcp_get_busid_by_port(port),
 460                                         port->wwpn);
 461         }
 462
 463  out:
 464         zfcp_port_put(port);
 465         __free_pages(send_els->req->page, 0);
 466         kfree(send_els->timer);
 467         kfree(send_els->req);
 468         kfree(send_els->resp);
 469         kfree(send_els);
 470 }
 471
 472
 473 /**
 474  * zfcp_test_link - lightweight link test procedure
 475  * @port: port to be tested
 476  *
 477  * Test status of a link to a remote port using the ELS command ADISC.
 478  */
 479 int
 480 zfcp_test_link(struct zfcp_port *port)
 481 {
 482         int retval;
 483
 484         zfcp_port_get(port);
 485         retval = zfcp_erp_adisc(port->adapter, port->d_id);
 486         if (retval != 0) {
 487                 zfcp_port_put(port);
 488                 ZFCP_LOG_NORMAL("reopen needed for port 0x%016Lx "
 489                                 "on adapter %s\n ", port->wwpn,
 490                                 zfcp_get_busid_by_port(port));
 491                 retval = zfcp_erp_port_forced_reopen(port, 0);
 492                 if (retval != 0) {
 493                         ZFCP_LOG_NORMAL("reopen of remote port 0x%016Lx "
 494                                         "on adapter %s failed\n", port->wwpn,
 495                                         zfcp_get_busid_by_port(port));
 496                         retval = -EPERM;
 497                 }
 498         }
 499
 500         return retval;
 501 }
 502
 503
 504 /*
 505  * function:
 506  *
 507  * purpose:     called if a port failed to be opened normally
 508  *              initiates Forced Reopen recovery which is done
 509  *              asynchronously
 510  *
 511  * returns:     0       - initiated action succesfully
 512  *              <0      - failed to initiate action
 513  */
 514 static int
 515 zfcp_erp_port_forced_reopen_internal(struct zfcp_port *port, int clear_mask)
 516 {
 517         int retval;
 518         struct zfcp_adapter *adapter = port->adapter;
 519
 520         debug_text_event(adapter->erp_dbf, 5, "pf_ro");
 521         debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
 522
 523         ZFCP_LOG_DEBUG("forced reopen of port 0x%016Lx on adapter %s\n",
 524                        port->wwpn, zfcp_get_busid_by_port(port));
 525
 526         zfcp_erp_port_block(port, clear_mask);
 527
 528         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
 529                 ZFCP_LOG_DEBUG("skipped forced reopen of failed port 0x%016Lx "
 530                                "on adapter %s\n", port->wwpn,
 531                                zfcp_get_busid_by_port(port));
 532                 debug_text_event(adapter->erp_dbf, 5, "pf_ro_f");
 533                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
 534                 retval = -EIO;
 535                 goto out;
 536         }
 537
 538         retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 539                                          port->adapter, port, NULL);
 540
 541  out:
 542         return retval;
 543 }
 544
 545 /*
 546  * function:
 547  *
 548  * purpose:     Wrappper for zfcp_erp_port_forced_reopen_internal
 549  *              used to ensure the correct locking
 550  *
 551  * returns:     0       - initiated action succesfully
 552  *              <0      - failed to initiate action
 553  */
 554 int
 555 zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear_mask)
 556 {
 557         int retval;
 558         unsigned long flags;
 559         struct zfcp_adapter *adapter;
 560
 561         adapter = port->adapter;
 562         read_lock_irqsave(&zfcp_data.config_lock, flags);
 563         write_lock(&adapter->erp_lock);
 564         retval = zfcp_erp_port_forced_reopen_internal(port, clear_mask);
 565         write_unlock(&adapter->erp_lock);
 566         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 567
 568         return retval;
 569 }
 570
 571 /*
 572  * function:
 573  *
 574  * purpose:     called if a port is to be opened
 575  *              initiates Reopen recovery which is done
 576  *              asynchronously
 577  *
 578  * returns:     0       - initiated action succesfully
 579  *              <0      - failed to initiate action
 580  */
 581 static int
 582 zfcp_erp_port_reopen_internal(struct zfcp_port *port, int clear_mask)
 583 {
 584         int retval;
 585         struct zfcp_adapter *adapter = port->adapter;
 586
 587         debug_text_event(adapter->erp_dbf, 5, "p_ro");
 588         debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
 589
 590         ZFCP_LOG_DEBUG("reopen of port 0x%016Lx on adapter %s\n",
 591                        port->wwpn, zfcp_get_busid_by_port(port));
 592
 593         zfcp_erp_port_block(port, clear_mask);
 594
 595         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
 596                 ZFCP_LOG_DEBUG("skipped reopen of failed port 0x%016Lx "
 597                                "on adapter %s\n", port->wwpn,
 598                                zfcp_get_busid_by_port(port));
 599                 debug_text_event(adapter->erp_dbf, 5, "p_ro_f");
 600                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
 601                 /* ensure propagation of failed status to new devices */
 602                 zfcp_erp_port_failed(port);
 603                 retval = -EIO;
 604                 goto out;
 605         }
 606
 607         retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 608                                          port->adapter, port, NULL);
 609
 610  out:
 611         return retval;
 612 }
 613
 614 /**
 615  * zfcp_erp_port_reopen - initiate reopen of a remote port
 616  * @port: port to be reopened
 617  * @clear_mask: specifies flags in port status to be cleared
 618  * Return: 0 on success, < 0 on error
 619  *
 620  * This is a wrappper function for zfcp_erp_port_reopen_internal. It ensures
 621  * correct locking. An error recovery task is initiated to do the reopen.
 622  * To wait for the completion of the reopen zfcp_erp_wait should be used.
 623  */
 624 int
 625 zfcp_erp_port_reopen(struct zfcp_port *port, int clear_mask)
 626 {
 627         int retval;
 628         unsigned long flags;
 629         struct zfcp_adapter *adapter = port->adapter;
 630
 631         read_lock_irqsave(&zfcp_data.config_lock, flags);
 632         write_lock(&adapter->erp_lock);
 633         retval = zfcp_erp_port_reopen_internal(port, clear_mask);
 634         write_unlock(&adapter->erp_lock);
 635         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 636
 637         return retval;
 638 }
 639
 640 /*
 641  * function:
 642  *
 643  * purpose:     called if a unit is to be opened
 644  *              initiates Reopen recovery which is done
 645  *              asynchronously
 646  *
 647  * returns:     0       - initiated action succesfully
 648  *              <0      - failed to initiate action
 649  */
 650 static int
 651 zfcp_erp_unit_reopen_internal(struct zfcp_unit *unit, int clear_mask)
 652 {
 653         int retval;
 654         struct zfcp_adapter *adapter = unit->port->adapter;
 655
 656         debug_text_event(adapter->erp_dbf, 5, "u_ro");
 657         debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t));
 658         ZFCP_LOG_DEBUG("reopen of unit 0x%016Lx on port 0x%016Lx "
 659                        "on adapter %s\n", unit->fcp_lun,
 660                        unit->port->wwpn, zfcp_get_busid_by_unit(unit));
 661
 662         zfcp_erp_unit_block(unit, clear_mask);
 663
 664         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status)) {
 665                 ZFCP_LOG_DEBUG("skipped reopen of failed unit 0x%016Lx "
 666                                "on port 0x%016Lx on adapter %s\n",
 667                                unit->fcp_lun, unit->port->wwpn,
 668                                zfcp_get_busid_by_unit(unit));
 669                 debug_text_event(adapter->erp_dbf, 5, "u_ro_f");
 670                 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
 671                             sizeof (fcp_lun_t));
 672                 retval = -EIO;
 673                 goto out;
 674         }
 675
 676         retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 677                                          unit->port->adapter, unit->port, unit);
 678  out:
 679         return retval;
 680 }
 681
 682 /**
 683  * zfcp_erp_unit_reopen - initiate reopen of a unit
 684  * @unit: unit to be reopened
 685  * @clear_mask: specifies flags in unit status to be cleared
 686  * Return: 0 on success, < 0 on error
 687  *
 688  * This is a wrappper for zfcp_erp_unit_reopen_internal. It ensures correct
 689  * locking. An error recovery task is initiated to do the reopen.
 690  * To wait for the completion of the reopen zfcp_erp_wait should be used.
 691  */
 692 int
 693 zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear_mask)
 694 {
 695         int retval;
 696         unsigned long flags;
 697         struct zfcp_adapter *adapter;
 698         struct zfcp_port *port;
 699
 700         port = unit->port;
 701         adapter = port->adapter;
 702
 703         read_lock_irqsave(&zfcp_data.config_lock, flags);
 704         write_lock(&adapter->erp_lock);
 705         retval = zfcp_erp_unit_reopen_internal(unit, clear_mask);
 706         write_unlock(&adapter->erp_lock);
 707         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 708
 709         return retval;
 710 }
 711
 712 /*
 713  * function:
 714  *
 715  * purpose:     disable I/O,
 716  *              return any open requests and clean them up,
 717  *              aim: no pending and incoming I/O
 718  *
 719  * returns:
 720  */
 721 static void
 722 zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int clear_mask)
 723 {
 724         debug_text_event(adapter->erp_dbf, 6, "a_bl");
 725         zfcp_erp_modify_adapter_status(adapter,
 726                                        ZFCP_STATUS_COMMON_UNBLOCKED |
 727                                        clear_mask, ZFCP_CLEAR);
 728 }
 729
 730 /*
 731  * function:
 732  *
 733  * purpose:     enable I/O
 734  *
 735  * returns:
 736  */
 737 static void
 738 zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 739 {
 740         debug_text_event(adapter->erp_dbf, 6, "a_ubl");
 741         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 742 }
 743
 744 /*
 745  * function:
 746  *
 747  * purpose:     disable I/O,
 748  *              return any open requests and clean them up,
 749  *              aim: no pending and incoming I/O
 750  *
 751  * returns:
 752  */
 753 static void
 754 zfcp_erp_port_block(struct zfcp_port *port, int clear_mask)
 755 {
 756         struct zfcp_adapter *adapter = port->adapter;
 757
 758         debug_text_event(adapter->erp_dbf, 6, "p_bl");
 759         debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
 760         zfcp_erp_modify_port_status(port,
 761                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 762                                     ZFCP_CLEAR);
 763 }
 764
 765 /*
 766  * function:
 767  *
 768  * purpose:     enable I/O
 769  *
 770  * returns:
 771  */
 772 static void
 773 zfcp_erp_port_unblock(struct zfcp_port *port)
 774 {
 775         struct zfcp_adapter *adapter = port->adapter;
 776
 777         debug_text_event(adapter->erp_dbf, 6, "p_ubl");
 778         debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
 779         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 780 }
 781
 782 /*
 783  * function:
 784  *
 785  * purpose:     disable I/O,
 786  *              return any open requests and clean them up,
 787  *              aim: no pending and incoming I/O
 788  *
 789  * returns:
 790  */
 791 static void
 792 zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 793 {
 794         struct zfcp_adapter *adapter = unit->port->adapter;
 795
 796         debug_text_event(adapter->erp_dbf, 6, "u_bl");
 797         debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
 798         zfcp_erp_modify_unit_status(unit,
 799                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 800                                     ZFCP_CLEAR);
 801 }
 802
 803 /*
 804  * function:
 805  *
 806  * purpose:     enable I/O
 807  *
 808  * returns:
 809  */
 810 static void
 811 zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 812 {
 813         struct zfcp_adapter *adapter = unit->port->adapter;
 814
 815         debug_text_event(adapter->erp_dbf, 6, "u_ubl");
 816         debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
 817         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 818 }
 819
 820 /*
 821  * function:
 822  *
 823  * purpose:
 824  *
 825  * returns:
 826  */
 827 static void
 828 zfcp_erp_action_ready(struct zfcp_erp_action *erp_action)
 829 {
 830         struct zfcp_adapter *adapter = erp_action->adapter;
 831
 832         debug_text_event(adapter->erp_dbf, 4, "a_ar");
 833         debug_event(adapter->erp_dbf, 4, &erp_action->action, sizeof (int));
 834
 835         zfcp_erp_action_to_ready(erp_action);
 836         up(&adapter->erp_ready_sem);
 837 }
 838
 839 /*
 840  * function:
 841  *
 842  * purpose:
 843  *
 844  * returns:     <0                      erp_action not found in any list
 845  *              ZFCP_ERP_ACTION_READY   erp_action is in ready list
 846  *              ZFCP_ERP_ACTION_RUNNING erp_action is in running list
 847  *
 848  * locks:       erp_lock must be held
 849  */
 850 static int
 851 zfcp_erp_action_exists(struct zfcp_erp_action *erp_action)
 852 {
 853         int retval = -EINVAL;
 854         struct list_head *entry;
 855         struct zfcp_erp_action *entry_erp_action;
 856         struct zfcp_adapter *adapter = erp_action->adapter;
 857
 858         /* search in running list */
 859         list_for_each(entry, &adapter->erp_running_head) {
 860                 entry_erp_action =
 861                     list_entry(entry, struct zfcp_erp_action, list);
 862                 if (entry_erp_action == erp_action) {
 863                         retval = ZFCP_ERP_ACTION_RUNNING;
 864                         goto out;
 865                 }
 866         }
 867         /* search in ready list */
 868         list_for_each(entry, &adapter->erp_ready_head) {
 869                 entry_erp_action =
 870                     list_entry(entry, struct zfcp_erp_action, list);
 871                 if (entry_erp_action == erp_action) {
 872                         retval = ZFCP_ERP_ACTION_READY;
 873                         goto out;
 874                 }
 875         }
 876
 877  out:
 878         return retval;
 879 }
 880
 881 /*
 882  * purpose:     checks current status of action (timed out, dismissed, ...)
 883  *              and does appropriate preparations (dismiss fsf request, ...)
 884  *
 885  * locks:       called under erp_lock (disabled interrupts)
 886  *
 887  * returns:     0
 888  */
 889 static int
 890 zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *erp_action)
 891 {
 892         int retval = 0;
 893         struct zfcp_fsf_req *fsf_req;
 894         struct zfcp_adapter *adapter = erp_action->adapter;
 895
 896         if (erp_action->fsf_req) {
 897                 /* take lock to ensure that request is not being deleted meanwhile */
 898                 write_lock(&adapter->fsf_req_list_lock);
 899                 /* check whether fsf req does still exist */
 900                 list_for_each_entry(fsf_req, &adapter->fsf_req_list_head, list)
 901                     if (fsf_req == erp_action->fsf_req)
 902                         break;
 903                 if (fsf_req == erp_action->fsf_req) {
 904                         /* fsf_req still exists */
 905                         debug_text_event(adapter->erp_dbf, 3, "a_ca_req");
 906                         debug_event(adapter->erp_dbf, 3, &fsf_req,
 907                                     sizeof (unsigned long));
 908                         /* dismiss fsf_req of timed out or dismissed erp_action */
 909                         if (erp_action->status & (ZFCP_STATUS_ERP_DISMISSED |
 910                                                   ZFCP_STATUS_ERP_TIMEDOUT)) {
 911                                 debug_text_event(adapter->erp_dbf, 3,
 912                                                  "a_ca_disreq");
 913                                 fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 914                         }
 915                         if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
 916                                 ZFCP_LOG_NORMAL("error: erp step timed out "
 917                                                 "(action=%d, fsf_req=%p)\n ",
 918                                                 erp_action->action,
 919                                                 erp_action->fsf_req);
 920                         }
 921                         /*
 922                          * If fsf_req is neither dismissed nor completed
 923                          * then keep it running asynchronously and don't mess
 924                          * with the association of erp_action and fsf_req.
 925                          */
 926                         if (fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
 927                                                ZFCP_STATUS_FSFREQ_DISMISSED)) {
 928                                 /* forget about association between fsf_req
 929                                    and erp_action */
 930                                 fsf_req->erp_action = NULL;
 931                                 erp_action->fsf_req = NULL;
 932                         }
 933                 } else {
 934                         debug_text_event(adapter->erp_dbf, 3, "a_ca_gonereq");
 935                         /*
 936                          * even if this fsf_req has gone, forget about
 937                          * association between erp_action and fsf_req
 938                          */
 939                         erp_action->fsf_req = NULL;
 940                 }
 941                 write_unlock(&adapter->fsf_req_list_lock);
 942         } else
 943                 debug_text_event(adapter->erp_dbf, 3, "a_ca_noreq");
 944
 945         return retval;
 946 }
 947
 948 /*
 949  * purpose:     generic handler for asynchronous events related to erp_action events
 950  *              (normal completion, time-out, dismissing, retry after
 951  *              low memory condition)
 952  *
 953  * note:        deletion of timer is not required (e.g. in case of a time-out),
 954  *              but a second try does no harm,
 955  *              we leave it in here to allow for greater simplification
 956  *
 957  * returns:     0 - there was an action to handle
 958  *              !0 - otherwise
 959  */
 960 static int
 961 zfcp_erp_async_handler_nolock(struct zfcp_erp_action *erp_action,
 962                               unsigned long set_mask)
 963 {
 964         int retval;
 965         struct zfcp_adapter *adapter = erp_action->adapter;
 966
 967         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 968                 debug_text_event(adapter->erp_dbf, 2, "a_asyh_ex");
 969                 debug_event(adapter->erp_dbf, 2, &erp_action->action,
 970                             sizeof (int));
 971                 if (!(set_mask & ZFCP_STATUS_ERP_TIMEDOUT))
 972                         del_timer(&erp_action->timer);
 973                 erp_action->status |= set_mask;
 974                 zfcp_erp_action_ready(erp_action);
 975                 retval = 0;
 976         } else {
 977                 /* action is ready or gone - nothing to do */
 978                 debug_text_event(adapter->erp_dbf, 3, "a_asyh_gone");
 979                 debug_event(adapter->erp_dbf, 3, &erp_action->action,
 980                             sizeof (int));
 981                 retval = 1;
 982         }
 983
 984         return retval;
 985 }
 986
 987 /*
 988  * purpose:     generic handler for asynchronous events related to erp_action
 989  *               events (normal completion, time-out, dismissing, retry after
 990  *              low memory condition)
 991  *
 992  * note:        deletion of timer is not required (e.g. in case of a time-out),
 993  *              but a second try does no harm,
 994  *              we leave it in here to allow for greater simplification
 995  *
 996  * returns:     0 - there was an action to handle
 997  *              !0 - otherwise
 998  */
 999 int
1000 zfcp_erp_async_handler(struct zfcp_erp_action *erp_action,
1001                        unsigned long set_mask)
1002 {
1003         struct zfcp_adapter *adapter = erp_action->adapter;
1004         unsigned long flags;
1005         int retval;
1006
1007         write_lock_irqsave(&adapter->erp_lock, flags);
1008         retval = zfcp_erp_async_handler_nolock(erp_action, set_mask);
1009         write_unlock_irqrestore(&adapter->erp_lock, flags);
1010
1011         return retval;
1012 }
1013
1014 /*
1015  * purpose:     is called for erp_action which was slept waiting for
1016  *              memory becoming avaliable,
1017  *              will trigger that this action will be continued
1018  */
1019 static void
1020 zfcp_erp_memwait_handler(unsigned long data)
1021 {
1022         struct zfcp_erp_action *erp_action = (struct zfcp_erp_action *) data;
1023         struct zfcp_adapter *adapter = erp_action->adapter;
1024
1025         debug_text_event(adapter->erp_dbf, 2, "a_mwh");
1026         debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int));
1027
1028         zfcp_erp_async_handler(erp_action, 0);
1029 }
1030
1031 /*
1032  * purpose:     is called if an asynchronous erp step timed out,
1033  *              action gets an appropriate flag and will be processed
1034  *              accordingly
1035  */
1036 static void
1037 zfcp_erp_timeout_handler(unsigned long data)
1038 {
1039         struct zfcp_erp_action *erp_action = (struct zfcp_erp_action *) data;
1040         struct zfcp_adapter *adapter = erp_action->adapter;
1041
1042         debug_text_event(adapter->erp_dbf, 2, "a_th");
1043         debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int));
1044
1045         zfcp_erp_async_handler(erp_action, ZFCP_STATUS_ERP_TIMEDOUT);
1046 }
1047
1048 /*
1049  * purpose:     is called for an erp_action which needs to be ended
1050  *              though not being done,
1051  *              this is usually required if an higher is generated,
1052  *              action gets an appropriate flag and will be processed
1053  *              accordingly
1054  *
1055  * locks:       erp_lock held (thus we need to call another handler variant)
1056  */
1057 static int
1058 zfcp_erp_action_dismiss(struct zfcp_erp_action *erp_action)
1059 {
1060         struct zfcp_adapter *adapter = erp_action->adapter;
1061
1062         debug_text_event(adapter->erp_dbf, 2, "a_adis");
1063         debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int));
1064
1065         zfcp_erp_async_handler_nolock(erp_action, ZFCP_STATUS_ERP_DISMISSED);
1066
1067         return 0;
1068 }
1069
1070 int
1071 zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1072 {
1073         int retval = 0;
1074
1075         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1076
1077         rwlock_init(&adapter->erp_lock);
1078         INIT_LIST_HEAD(&adapter->erp_ready_head);
1079         INIT_LIST_HEAD(&adapter->erp_running_head);
1080         sema_init(&adapter->erp_ready_sem, 0);
1081
1082         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1083         if (retval < 0) {
1084                 ZFCP_LOG_NORMAL("error: creation of erp thread failed for "
1085                                 "adapter %s\n",
1086                                 zfcp_get_busid_by_adapter(adapter));
1087                 debug_text_event(adapter->erp_dbf, 5, "a_thset_fail");
1088         } else {
1089                 wait_event(adapter->erp_thread_wqh,
1090                            atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
1091                                             &adapter->status));
1092                 debug_text_event(adapter->erp_dbf, 5, "a_thset_ok");
1093         }
1094
1095         return (retval < 0);
1096 }
1097
1098 /*
1099  * function:
1100  *
1101  * purpose:
1102  *
1103  * returns:
1104  *
1105  * context:     process (i.e. proc-fs or rmmod/insmod)
1106  *
1107  * note:        The caller of this routine ensures that the specified
1108  *              adapter has been shut down and that this operation
1109  *              has been completed. Thus, there are no pending erp_actions
1110  *              which would need to be handled here.
1111  */
1112 int
1113 zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1114 {
1115         int retval = 0;
1116
1117         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1118         up(&adapter->erp_ready_sem);
1119
1120         wait_event(adapter->erp_thread_wqh,
1121                    !atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
1122                                      &adapter->status));
1123
1124         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1125                           &adapter->status);
1126
1127         debug_text_event(adapter->erp_dbf, 5, "a_thki_ok");
1128
1129         return retval;
1130 }
1131
1132 /*
1133  * purpose:     is run as a kernel thread,
1134  *              goes through list of error recovery actions of associated adapter
1135  *              and delegates single action to execution
1136  *
1137  * returns:     0
1138  */
1139 static int
1140 zfcp_erp_thread(void *data)
1141 {
1142         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1143         struct list_head *next;
1144         struct zfcp_erp_action *erp_action;
1145         unsigned long flags;
1146
1147         daemonize("zfcperp%s", zfcp_get_busid_by_adapter(adapter));
1148         /* Block all signals */
1149         siginitsetinv(&current->blocked, 0);
1150         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1151         debug_text_event(adapter->erp_dbf, 5, "a_th_run");
1152         wake_up(&adapter->erp_thread_wqh);
1153
1154         while (!atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1155                                  &adapter->status)) {
1156
1157                 write_lock_irqsave(&adapter->erp_lock, flags);
1158                 next = adapter->erp_ready_head.prev;
1159                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1160
1161                 if (next != &adapter->erp_ready_head) {
1162                         erp_action =
1163                             list_entry(next, struct zfcp_erp_action, list);
1164                         /*
1165                          * process action (incl. [re]moving it
1166                          * from 'ready' queue)
1167                          */
1168                         zfcp_erp_strategy(erp_action);
1169                 }
1170
1171                 /*
1172                  * sleep as long as there is nothing to do, i.e.
1173                  * no action in 'ready' queue to be processed and
1174                  * thread is not to be killed
1175                  */
1176                 down_interruptible(&adapter->erp_ready_sem);
1177                 debug_text_event(adapter->erp_dbf, 5, "a_th_woken");
1178         }
1179
1180         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1181         debug_text_event(adapter->erp_dbf, 5, "a_th_stop");
1182         wake_up(&adapter->erp_thread_wqh);
1183
1184         return 0;
1185 }
1186
1187 /*
1188  * function:
1189  *
1190  * purpose:     drives single error recovery action and schedules higher and
1191  *              subordinate actions, if necessary
1192  *
1193  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
1194  *              ZFCP_ERP_SUCCEEDED      - action finished successfully (deqd)
1195  *              ZFCP_ERP_FAILED         - action finished unsuccessfully (deqd)
1196  *              ZFCP_ERP_EXIT           - action finished (dequeued), offline
1197  *              ZFCP_ERP_DISMISSED      - action canceled (dequeued)
1198  */
1199 static int
1200 zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1201 {
1202         int retval = 0;
1203         struct zfcp_adapter *adapter = erp_action->adapter;
1204         struct zfcp_port *port = erp_action->port;
1205         struct zfcp_unit *unit = erp_action->unit;
1206         int action = erp_action->action;
1207         u32 status = erp_action->status;
1208         unsigned long flags;
1209
1210         /* serialise dismissing, timing out, moving, enqueueing */
1211         read_lock_irqsave(&zfcp_data.config_lock, flags);
1212         write_lock(&adapter->erp_lock);
1213
1214         /* dequeue dismissed action and leave, if required */
1215         retval = zfcp_erp_strategy_check_action(erp_action, retval);
1216         if (retval == ZFCP_ERP_DISMISSED) {
1217                 debug_text_event(adapter->erp_dbf, 4, "a_st_dis1");
1218                 goto unlock;
1219         }
1220
1221         /*
1222          * move action to 'running' queue before processing it
1223          * (to avoid a race condition regarding moving the
1224          * action to the 'running' queue and back)
1225          */
1226         zfcp_erp_action_to_running(erp_action);
1227
1228         /*
1229          * try to process action as far as possible,
1230          * no lock to allow for blocking operations (kmalloc, qdio, ...),
1231          * afterwards the lock is required again for the following reasons:
1232          * - dequeueing of finished action and enqueueing of
1233          *   follow-up actions must be atomic so that any other
1234          *   reopen-routine does not believe there is nothing to do
1235          *   and that it is safe to enqueue something else,
1236          * - we want to force any control thread which is dismissing
1237          *   actions to finish this before we decide about
1238          *   necessary steps to be taken here further
1239          */
1240         write_unlock(&adapter->erp_lock);
1241         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1242         retval = zfcp_erp_strategy_do_action(erp_action);
1243         read_lock_irqsave(&zfcp_data.config_lock, flags);
1244         write_lock(&adapter->erp_lock);
1245
1246         /*
1247          * check for dismissed status again to avoid follow-up actions,
1248          * failing of targets and so on for dismissed actions
1249          */
1250         retval = zfcp_erp_strategy_check_action(erp_action, retval);
1251
1252         switch (retval) {
1253         case ZFCP_ERP_DISMISSED:
1254                 /* leave since this action has ridden to its ancestors */
1255                 debug_text_event(adapter->erp_dbf, 6, "a_st_dis2");
1256                 goto unlock;
1257         case ZFCP_ERP_NOMEM:
1258                 /* no memory to continue immediately, let it sleep */
1259                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1260                         ++adapter->erp_low_mem_count;
1261                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1262                 }
1263                 /* This condition is true if there is no memory available
1264                    for any erp_action on this adapter. This implies that there
1265                    are no elements in the memory pool(s) left for erp_actions.
1266                    This might happen if an erp_action that used a memory pool
1267                    element was timed out.
1268                  */
1269                 if (adapter->erp_total_count == adapter->erp_low_mem_count) {
1270                         debug_text_event(adapter->erp_dbf, 3, "a_st_lowmem");
1271                         ZFCP_LOG_NORMAL("error: no mempool elements available, "
1272                                         "restarting I/O on adapter %s "
1273                                         "to free mempool\n",
1274                                         zfcp_get_busid_by_adapter(adapter));
1275                         zfcp_erp_adapter_reopen_internal(adapter, 0);
1276                 } else {
1277                 debug_text_event(adapter->erp_dbf, 2, "a_st_memw");
1278                 retval = zfcp_erp_strategy_memwait(erp_action);
1279                 }
1280                 goto unlock;
1281         case ZFCP_ERP_CONTINUES:
1282                 /* leave since this action runs asynchronously */
1283                 debug_text_event(adapter->erp_dbf, 6, "a_st_cont");
1284                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1285                         --adapter->erp_low_mem_count;
1286                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1287                 }
1288                 goto unlock;
1289         }
1290         /* ok, finished action (whatever its result is) */
1291
1292         /* check for unrecoverable targets */
1293         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1294
1295         /* action must be dequeued (here to allow for further ones) */
1296         zfcp_erp_action_dequeue(erp_action);
1297
1298         /*
1299          * put this target through the erp mill again if someone has
1300          * requested to change the status of a target being online
1301          * to offline or the other way around
1302          * (old retval is preserved if nothing has to be done here)
1303          */
1304         retval = zfcp_erp_strategy_statechange(action, status, adapter,
1305                                                port, unit, retval);
1306
1307         /*
1308          * leave if target is in permanent error state or if
1309          * action is repeated in order to process state change
1310          */
1311         if (retval == ZFCP_ERP_EXIT) {
1312                 debug_text_event(adapter->erp_dbf, 2, "a_st_exit");
1313                 goto unlock;
1314         }
1315
1316         /* trigger follow up actions */
1317         zfcp_erp_strategy_followup_actions(action, adapter, port, unit, retval);
1318
1319  unlock:
1320         write_unlock(&adapter->erp_lock);
1321         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1322
1323         if (retval != ZFCP_ERP_CONTINUES)
1324                 zfcp_erp_action_cleanup(action, adapter, port, unit, retval);
1325
1326         /*
1327          * a few tasks remain when the erp queues are empty
1328          * (don't do that if the last action evaluated was dismissed
1329          * since this clearly indicates that there is more to come) :
1330          * - close the name server port if it is open yet
1331          *   (enqueues another [probably] final action)
1332          * - otherwise, wake up whoever wants to be woken when we are
1333          *   done with erp
1334          */
1335         if (retval != ZFCP_ERP_DISMISSED)
1336                 zfcp_erp_strategy_check_queues(adapter);
1337
1338         debug_text_event(adapter->erp_dbf, 6, "a_st_done");
1339
1340         return retval;
1341 }
1342
1343 /*
1344  * function:
1345  *
1346  * purpose:
1347  *
1348  * returns:     ZFCP_ERP_DISMISSED      - if action has been dismissed
1349  *              retval                  - otherwise
1350  */
1351 static int
1352 zfcp_erp_strategy_check_action(struct zfcp_erp_action *erp_action, int retval)
1353 {
1354         struct zfcp_adapter *adapter = erp_action->adapter;
1355
1356         zfcp_erp_strategy_check_fsfreq(erp_action);
1357
1358         debug_event(adapter->erp_dbf, 5, &erp_action->action, sizeof (int));
1359         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1360                 debug_text_event(adapter->erp_dbf, 3, "a_stcd_dis");
1361                 zfcp_erp_action_dequeue(erp_action);
1362                 retval = ZFCP_ERP_DISMISSED;
1363         } else
1364                 debug_text_event(adapter->erp_dbf, 5, "a_stcd_nodis");
1365
1366         return retval;
1367 }
1368
1369 /*
1370  * function:
1371  *
1372  * purpose:
1373  *
1374  * returns:
1375  */
1376 static int
1377 zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1378 {
1379         int retval = ZFCP_ERP_FAILED;
1380         struct zfcp_adapter *adapter = erp_action->adapter;
1381
1382         /*
1383          * try to execute/continue action as far as possible,
1384          * note: no lock in subsequent strategy routines
1385          * (this allows these routine to call schedule, e.g.
1386          * kmalloc with such flags or qdio_initialize & friends)
1387          * Note: in case of timeout, the seperate strategies will fail
1388          * anyhow. No need for a special action. Even worse, a nameserver
1389          * failure would not wake up waiting ports without the call.
1390          */
1391         switch (erp_action->action) {
1392
1393         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1394                 retval = zfcp_erp_adapter_strategy(erp_action);
1395                 break;
1396
1397         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1398                 retval = zfcp_erp_port_forced_strategy(erp_action);
1399                 break;
1400
1401         case ZFCP_ERP_ACTION_REOPEN_PORT:
1402                 retval = zfcp_erp_port_strategy(erp_action);
1403                 break;
1404
1405         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1406                 retval = zfcp_erp_unit_strategy(erp_action);
1407                 break;
1408
1409         default:
1410                 debug_text_exception(adapter->erp_dbf, 1, "a_stda_bug");
1411                 debug_event(adapter->erp_dbf, 1, &erp_action->action,
1412                             sizeof (int));
1413                 ZFCP_LOG_NORMAL("bug: unknown erp action requested on "
1414                                 "adapter %s (action=%d)\n",
1415                                 zfcp_get_busid_by_adapter(erp_action->adapter),
1416                                 erp_action->action);
1417         }
1418
1419         return retval;
1420 }
1421
1422 /*
1423  * function:
1424  *
1425  * purpose:     triggers retry of this action after a certain amount of time
1426  *              by means of timer provided by erp_action
1427  *
1428  * returns:     ZFCP_ERP_CONTINUES - erp_action sleeps in erp running queue
1429  */
1430 static int
1431 zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
1432 {
1433         int retval = ZFCP_ERP_CONTINUES;
1434         struct zfcp_adapter *adapter = erp_action->adapter;
1435
1436         debug_text_event(adapter->erp_dbf, 6, "a_mwinit");
1437         debug_event(adapter->erp_dbf, 6, &erp_action->action, sizeof (int));
1438         init_timer(&erp_action->timer);
1439         erp_action->timer.function = zfcp_erp_memwait_handler;
1440         erp_action->timer.data = (unsigned long) erp_action;
1441         erp_action->timer.expires = jiffies + ZFCP_ERP_MEMWAIT_TIMEOUT;
1442         add_timer(&erp_action->timer);
1443
1444         return retval;
1445 }
1446
1447 /*
1448  * function:    zfcp_erp_adapter_failed
1449  *
1450  * purpose:     sets the adapter and all underlying devices to ERP_FAILED
1451  *
1452  */
1453 void
1454 zfcp_erp_adapter_failed(struct zfcp_adapter *adapter)
1455 {
1456         zfcp_erp_modify_adapter_status(adapter,
1457                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1458         ZFCP_LOG_NORMAL("adapter erp failed on adapter %s\n",
1459                         zfcp_get_busid_by_adapter(adapter));
1460         debug_text_event(adapter->erp_dbf, 2, "a_afail");
1461 }
1462
1463 /*
1464  * function:    zfcp_erp_port_failed
1465  *
1466  * purpose:     sets the port and all underlying devices to ERP_FAILED
1467  *
1468  */
1469 void
1470 zfcp_erp_port_failed(struct zfcp_port *port)
1471 {
1472         zfcp_erp_modify_port_status(port,
1473                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1474
1475         if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
1476                 ZFCP_LOG_NORMAL("port erp failed (adapter %s, "
1477                                 "port d_id=0x%08x)\n",
1478                                 zfcp_get_busid_by_port(port), port->d_id);
1479         else
1480                 ZFCP_LOG_NORMAL("port erp failed (adapter %s, wwpn=0x%016Lx)\n",
1481                                 zfcp_get_busid_by_port(port), port->wwpn);
1482
1483         debug_text_event(port->adapter->erp_dbf, 2, "p_pfail");
1484         debug_event(port->adapter->erp_dbf, 2, &port->wwpn, sizeof (wwn_t));
1485 }
1486
1487 /*
1488  * function:    zfcp_erp_unit_failed
1489  *
1490  * purpose:     sets the unit to ERP_FAILED
1491  *
1492  */
1493 void
1494 zfcp_erp_unit_failed(struct zfcp_unit *unit)
1495 {
1496         zfcp_erp_modify_unit_status(unit,
1497                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1498
1499         ZFCP_LOG_NORMAL("unit erp failed on unit 0x%016Lx on port 0x%016Lx "
1500                         " on adapter %s\n", unit->fcp_lun,
1501                         unit->port->wwpn, zfcp_get_busid_by_unit(unit));
1502         debug_text_event(unit->port->adapter->erp_dbf, 2, "u_ufail");
1503         debug_event(unit->port->adapter->erp_dbf, 2,
1504                     &unit->fcp_lun, sizeof (fcp_lun_t));
1505 }
1506
1507 /*
1508  * function:    zfcp_erp_strategy_check_target
1509  *
1510  * purpose:     increments the erp action count on the device currently in
1511  *              recovery if the action failed or resets the count in case of
1512  *              success. If a maximum count is exceeded the device is marked
1513  *              as ERP_FAILED.
1514  *              The 'blocked' state of a target which has been recovered
1515  *              successfully is reset.
1516  *
1517  * returns:     ZFCP_ERP_CONTINUES      - action continues (not considered)
1518  *              ZFCP_ERP_SUCCEEDED      - action finished successfully
1519  *              ZFCP_ERP_EXIT           - action failed and will not continue
1520  */
1521 static int
1522 zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action, int result)
1523 {
1524         struct zfcp_adapter *adapter = erp_action->adapter;
1525         struct zfcp_port *port = erp_action->port;
1526         struct zfcp_unit *unit = erp_action->unit;
1527
1528         debug_text_event(adapter->erp_dbf, 5, "a_stct_norm");
1529         debug_event(adapter->erp_dbf, 5, &erp_action->action, sizeof (int));
1530         debug_event(adapter->erp_dbf, 5, &result, sizeof (int));
1531
1532         switch (erp_action->action) {
1533
1534         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1535                 result = zfcp_erp_strategy_check_unit(unit, result);
1536                 break;
1537
1538         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1539         case ZFCP_ERP_ACTION_REOPEN_PORT:
1540                 result = zfcp_erp_strategy_check_port(port, result);
1541                 break;
1542
1543         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1544                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1545                 break;
1546         }
1547
1548         return result;
1549 }
1550
1551 /*
1552  * function:
1553  *
1554  * purpose:
1555  *
1556  * returns:
1557  */
1558 static int
1559 zfcp_erp_strategy_statechange(int action,
1560                               u32 status,
1561                               struct zfcp_adapter *adapter,
1562                               struct zfcp_port *port,
1563                               struct zfcp_unit *unit, int retval)
1564 {
1565         debug_text_event(adapter->erp_dbf, 3, "a_stsc");
1566         debug_event(adapter->erp_dbf, 3, &action, sizeof (int));
1567
1568         switch (action) {
1569
1570         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1571                 if (zfcp_erp_strategy_statechange_detected(&adapter->status,
1572                                                            status)) {
1573                         zfcp_erp_adapter_reopen_internal(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
1574                         retval = ZFCP_ERP_EXIT;
1575                 }
1576                 break;
1577
1578         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1579         case ZFCP_ERP_ACTION_REOPEN_PORT:
1580                 if (zfcp_erp_strategy_statechange_detected(&port->status,
1581                                                            status)) {
1582                         zfcp_erp_port_reopen_internal(port, ZFCP_STATUS_COMMON_ERP_FAILED);
1583                         retval = ZFCP_ERP_EXIT;
1584                 }
1585                 break;
1586
1587         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1588                 if (zfcp_erp_strategy_statechange_detected(&unit->status,
1589                                                            status)) {
1590                         zfcp_erp_unit_reopen_internal(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
1591                         retval = ZFCP_ERP_EXIT;
1592                 }
1593                 break;
1594         }
1595
1596         return retval;
1597 }
1598
1599 /*
1600  * function:
1601  *
1602  * purpose:
1603  *
1604  * returns:
1605  */
1606 static inline int
1607 zfcp_erp_strategy_statechange_detected(atomic_t * target_status, u32 erp_status)
1608 {
1609         return
1610             /* take it online */
1611             (atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, target_status) &&
1612              (ZFCP_STATUS_ERP_CLOSE_ONLY & erp_status)) ||
1613             /* take it offline */
1614             (!atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, target_status) &&
1615              !(ZFCP_STATUS_ERP_CLOSE_ONLY & erp_status));
1616 }
1617
1618 /*
1619  * function:
1620  *
1621  * purpose:
1622  *
1623  * returns:
1624  */
1625 static int
1626 zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
1627 {
1628         debug_text_event(unit->port->adapter->erp_dbf, 5, "u_stct");
1629         debug_event(unit->port->adapter->erp_dbf, 5, &unit->fcp_lun,
1630                     sizeof (fcp_lun_t));
1631
1632         switch (result) {
1633         case ZFCP_ERP_SUCCEEDED :
1634                 atomic_set(&unit->erp_counter, 0);
1635                 zfcp_erp_unit_unblock(unit);
1636                 break;
1637         case ZFCP_ERP_FAILED :
1638                 atomic_inc(&unit->erp_counter);
1639                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS)
1640                         zfcp_erp_unit_failed(unit);
1641                 break;
1642         case ZFCP_ERP_EXIT :
1643                 /* nothing */
1644                 break;
1645         }
1646
1647         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status)) {
1648                 zfcp_erp_unit_block(unit, 0); /* for ZFCP_ERP_SUCCEEDED */
1649                 result = ZFCP_ERP_EXIT;
1650         }
1651
1652         return result;
1653 }
1654
1655 /*
1656  * function:
1657  *
1658  * purpose:
1659  *
1660  * returns:
1661  */
1662 static int
1663 zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1664 {
1665         debug_text_event(port->adapter->erp_dbf, 5, "p_stct");
1666         debug_event(port->adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
1667
1668         switch (result) {
1669         case ZFCP_ERP_SUCCEEDED :
1670                 atomic_set(&port->erp_counter, 0);
1671                 zfcp_erp_port_unblock(port);
1672                 break;
1673         case ZFCP_ERP_FAILED :
1674                 atomic_inc(&port->erp_counter);
1675                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS)
1676                         zfcp_erp_port_failed(port);
1677                 break;
1678         case ZFCP_ERP_EXIT :
1679                 /* nothing */
1680                 break;
1681         }
1682
1683         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
1684                 zfcp_erp_port_block(port, 0); /* for ZFCP_ERP_SUCCEEDED */
1685                 result = ZFCP_ERP_EXIT;
1686         }
1687
1688         return result;
1689 }
1690
1691 /*
1692  * function:
1693  *
1694  * purpose:
1695  *
1696  * returns:
1697  */
1698 static int
1699 zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter, int result)
1700 {
1701         debug_text_event(adapter->erp_dbf, 5, "a_stct");
1702
1703         switch (result) {
1704         case ZFCP_ERP_SUCCEEDED :
1705                 atomic_set(&adapter->erp_counter, 0);
1706                 zfcp_erp_adapter_unblock(adapter);
1707                 break;
1708         case ZFCP_ERP_FAILED :
1709                 atomic_inc(&adapter->erp_counter);
1710                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS)
1711                         zfcp_erp_adapter_failed(adapter);
1712                 break;
1713         case ZFCP_ERP_EXIT :
1714                 /* nothing */
1715                 break;
1716         }
1717
1718         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) {
1719                 zfcp_erp_adapter_block(adapter, 0); /* for ZFCP_ERP_SUCCEEDED */
1720                 result = ZFCP_ERP_EXIT;
1721         }
1722
1723         return result;
1724 }
1725
1726 /*
1727  * function:
1728  *
1729  * purpose:     remaining things in good cases,
1730  *              escalation in bad cases
1731  *
1732  * returns:
1733  */
1734 static int
1735 zfcp_erp_strategy_followup_actions(int action,
1736                                    struct zfcp_adapter *adapter,
1737                                    struct zfcp_port *port,
1738                                    struct zfcp_unit *unit, int status)
1739 {
1740         debug_text_event(adapter->erp_dbf, 5, "a_stfol");
1741         debug_event(adapter->erp_dbf, 5, &action, sizeof (int));
1742
1743         /* initiate follow-up actions depending on success of finished action */
1744         switch (action) {
1745
1746         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1747                 if (status == ZFCP_ERP_SUCCEEDED)
1748                         zfcp_erp_port_reopen_all_internal(adapter, 0);
1749                 else
1750                         zfcp_erp_adapter_reopen_internal(adapter, 0);
1751                 break;
1752
1753         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1754                 if (status == ZFCP_ERP_SUCCEEDED)
1755                         zfcp_erp_port_reopen_internal(port, 0);
1756                 else
1757                         zfcp_erp_adapter_reopen_internal(adapter, 0);
1758                 break;
1759
1760         case ZFCP_ERP_ACTION_REOPEN_PORT:
1761                 if (status == ZFCP_ERP_SUCCEEDED)
1762                         zfcp_erp_unit_reopen_all_internal(port, 0);
1763                 else
1764                         zfcp_erp_port_forced_reopen_internal(port, 0);
1765                 break;
1766
1767         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1768                 if (status == ZFCP_ERP_SUCCEEDED) ;     /* no further action */
1769                 else
1770                         zfcp_erp_port_reopen_internal(unit->port, 0);
1771                 break;
1772         }
1773
1774         return 0;
1775 }
1776
1777 /*
1778  * function:
1779  *
1780  * purpose:
1781  *
1782  * returns:
1783  */
1784 static int
1785 zfcp_erp_strategy_check_queues(struct zfcp_adapter *adapter)
1786 {
1787         unsigned long flags;
1788
1789         read_lock_irqsave(&zfcp_data.config_lock, flags);
1790         read_lock(&adapter->erp_lock);
1791         if (list_empty(&adapter->erp_ready_head) &&
1792             list_empty(&adapter->erp_running_head)) {
1793                         debug_text_event(adapter->erp_dbf, 4, "a_cq_wake");
1794                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
1795                                           &adapter->status);
1796                         wake_up(&adapter->erp_done_wqh);
1797         } else
1798                 debug_text_event(adapter->erp_dbf, 5, "a_cq_notempty");
1799         read_unlock(&adapter->erp_lock);
1800         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1801
1802         return 0;
1803 }
1804
1805 /**
1806  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1807  * @adapter: adapter for which to wait for completion of its error recovery
1808  * Return: 0
1809  */
1810 int
1811 zfcp_erp_wait(struct zfcp_adapter *adapter)
1812 {
1813         int retval = 0;
1814
1815         wait_event(adapter->erp_done_wqh,
1816                    !atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
1817                                      &adapter->status));
1818
1819         return retval;
1820 }
1821
1822 /*
1823  * function:    zfcp_erp_modify_adapter_status
1824  *
1825  * purpose:
1826  *
1827  */
1828 void
1829 zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter,
1830                                u32 mask, int set_or_clear)
1831 {
1832         struct zfcp_port *port;
1833         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1834
1835         if (set_or_clear == ZFCP_SET) {
1836                 atomic_set_mask(mask, &adapter->status);
1837                 debug_text_event(adapter->erp_dbf, 3, "a_mod_as_s");
1838         } else {
1839                 atomic_clear_mask(mask, &adapter->status);
1840                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1841                         atomic_set(&adapter->erp_counter, 0);
1842                 debug_text_event(adapter->erp_dbf, 3, "a_mod_as_c");
1843         }
1844         debug_event(adapter->erp_dbf, 3, &mask, sizeof (u32));
1845
1846         /* Deal with all underlying devices, only pass common_mask */
1847         if (common_mask)
1848                 list_for_each_entry(port, &adapter->port_list_head, list)
1849                     zfcp_erp_modify_port_status(port, common_mask,
1850                                                 set_or_clear);
1851 }
1852
1853 /*
1854  * function:    zfcp_erp_modify_port_status
1855  *
1856  * purpose:     sets the port and all underlying devices to ERP_FAILED
1857  *
1858  */
1859 void
1860 zfcp_erp_modify_port_status(struct zfcp_port *port, u32 mask, int set_or_clear)
1861 {
1862         struct zfcp_unit *unit;
1863         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1864
1865         if (set_or_clear == ZFCP_SET) {
1866                 atomic_set_mask(mask, &port->status);
1867                 debug_text_event(port->adapter->erp_dbf, 3, "p_mod_ps_s");
1868         } else {
1869                 atomic_clear_mask(mask, &port->status);
1870                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1871                         atomic_set(&port->erp_counter, 0);
1872                 debug_text_event(port->adapter->erp_dbf, 3, "p_mod_ps_c");
1873         }
1874         debug_event(port->adapter->erp_dbf, 3, &port->wwpn, sizeof (wwn_t));
1875         debug_event(port->adapter->erp_dbf, 3, &mask, sizeof (u32));
1876
1877         /* Modify status of all underlying devices, only pass common mask */
1878         if (common_mask)
1879                 list_for_each_entry(unit, &port->unit_list_head, list)
1880                     zfcp_erp_modify_unit_status(unit, common_mask,
1881                                                 set_or_clear);
1882 }
1883
1884 /*
1885  * function:    zfcp_erp_modify_unit_status
1886  *
1887  * purpose:     sets the unit to ERP_FAILED
1888  *
1889  */
1890 void
1891 zfcp_erp_modify_unit_status(struct zfcp_unit *unit, u32 mask, int set_or_clear)
1892 {
1893         if (set_or_clear == ZFCP_SET) {
1894                 atomic_set_mask(mask, &unit->status);
1895                 debug_text_event(unit->port->adapter->erp_dbf, 3, "u_mod_us_s");
1896         } else {
1897                 atomic_clear_mask(mask, &unit->status);
1898                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1899                         atomic_set(&unit->erp_counter, 0);
1900                 }
1901                 debug_text_event(unit->port->adapter->erp_dbf, 3, "u_mod_us_c");
1902         }
1903         debug_event(unit->port->adapter->erp_dbf, 3, &unit->fcp_lun,
1904                     sizeof (fcp_lun_t));
1905         debug_event(unit->port->adapter->erp_dbf, 3, &mask, sizeof (u32));
1906 }
1907
1908 /*
1909  * function:
1910  *
1911  * purpose:     Wrappper for zfcp_erp_port_reopen_all_internal
1912  *              used to ensure the correct locking
1913  *
1914  * returns:     0       - initiated action succesfully
1915  *              <0      - failed to initiate action
1916  */
1917 int
1918 zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter, int clear_mask)
1919 {
1920         int retval;
1921         unsigned long flags;
1922
1923         read_lock_irqsave(&zfcp_data.config_lock, flags);
1924         write_lock(&adapter->erp_lock);
1925         retval = zfcp_erp_port_reopen_all_internal(adapter, clear_mask);
1926         write_unlock(&adapter->erp_lock);
1927         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1928
1929         return retval;
1930 }
1931
1932 /*
1933  * function:
1934  *
1935  * purpose:
1936  *
1937  * returns:     FIXME
1938  */
1939 static int
1940 zfcp_erp_port_reopen_all_internal(struct zfcp_adapter *adapter, int clear_mask)
1941 {
1942         int retval = 0;
1943         struct zfcp_port *port;
1944
1945         list_for_each_entry(port, &adapter->port_list_head, list)
1946                 if (!atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
1947                         zfcp_erp_port_reopen_internal(port, clear_mask);
1948
1949         return retval;
1950 }
1951
1952 /*
1953  * function:
1954  *
1955  * purpose:
1956  *
1957  * returns:     FIXME
1958  */
1959 static int
1960 zfcp_erp_unit_reopen_all_internal(struct zfcp_port *port, int clear_mask)
1961 {
1962         int retval = 0;
1963         struct zfcp_unit *unit;
1964
1965         list_for_each_entry(unit, &port->unit_list_head, list)
1966             zfcp_erp_unit_reopen_internal(unit, clear_mask);
1967
1968         return retval;
1969 }
1970
1971 /*
1972  * function:
1973  *
1974  * purpose:     this routine executes the 'Reopen Adapter' action
1975  *              (the entire action is processed synchronously, since
1976  *              there are no actions which might be run concurrently
1977  *              per definition)
1978  *
1979  * returns:     ZFCP_ERP_SUCCEEDED      - action finished successfully
1980  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
1981  */
1982 static int
1983 zfcp_erp_adapter_strategy(struct zfcp_erp_action *erp_action)
1984 {
1985         int retval;
1986         struct zfcp_adapter *adapter = erp_action->adapter;
1987
1988         retval = zfcp_erp_adapter_strategy_close(erp_action);
1989         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
1990                 retval = ZFCP_ERP_EXIT;
1991         else
1992                 retval = zfcp_erp_adapter_strategy_open(erp_action);
1993
1994         debug_text_event(adapter->erp_dbf, 3, "a_ast/ret");
1995         debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
1996         debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
1997
1998         if (retval == ZFCP_ERP_FAILED) {
1999                 ZFCP_LOG_INFO("Waiting to allow the adapter %s "
2000                               "to recover itself\n",
2001                               zfcp_get_busid_by_adapter(adapter));
2002                 msleep(jiffies_to_msecs(ZFCP_TYPE2_RECOVERY_TIME));
2003         }
2004
2005         return retval;
2006 }
2007
2008 /*
2009  * function:
2010  *
2011  * purpose:
2012  *
2013  * returns:     ZFCP_ERP_SUCCEEDED      - action finished successfully
2014  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
2015  */
2016 static int
2017 zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *erp_action)
2018 {
2019         int retval;
2020
2021         atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING,
2022                         &erp_action->adapter->status);
2023         retval = zfcp_erp_adapter_strategy_generic(erp_action, 1);
2024         atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING,
2025                           &erp_action->adapter->status);
2026
2027         return retval;
2028 }
2029
2030 /*
2031  * function:
2032  *
2033  * purpose:
2034  *
2035  * returns:     ZFCP_ERP_SUCCEEDED      - action finished successfully
2036  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
2037  */
2038 static int
2039 zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *erp_action)
2040 {
2041         int retval;
2042
2043         atomic_set_mask(ZFCP_STATUS_COMMON_OPENING,
2044                         &erp_action->adapter->status);
2045         retval = zfcp_erp_adapter_strategy_generic(erp_action, 0);
2046         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING,
2047                           &erp_action->adapter->status);
2048
2049         return retval;
2050 }
2051
2052 /*
2053  * function:    zfcp_register_adapter
2054  *
2055  * purpose:     allocate the irq associated with this devno and register
2056  *              the FSF adapter with the SCSI stack
2057  *
2058  * returns:
2059  */
2060 static int
2061 zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *erp_action, int close)
2062 {
2063         int retval = ZFCP_ERP_SUCCEEDED;
2064
2065         if (close)
2066                 goto close_only;
2067
2068         retval = zfcp_erp_adapter_strategy_open_qdio(erp_action);
2069         if (retval != ZFCP_ERP_SUCCEEDED)
2070                 goto failed_qdio;
2071
2072         retval = zfcp_erp_adapter_strategy_open_fsf(erp_action);
2073         if (retval != ZFCP_ERP_SUCCEEDED)
2074                 goto failed_openfcp;
2075
2076         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &erp_action->adapter->status);
2077         goto out;
2078
2079  close_only:
2080         atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
2081                           &erp_action->adapter->status);
2082
2083  failed_openfcp:
2084         zfcp_erp_adapter_strategy_close_qdio(erp_action);
2085         zfcp_erp_adapter_strategy_close_fsf(erp_action);
2086  failed_qdio:
2087  out:
2088         return retval;
2089 }
2090
2091 /*
2092  * function:    zfcp_qdio_init
2093  *
2094  * purpose:     setup QDIO operation for specified adapter
2095  *
2096  * returns:     0 - successful setup
2097  *              !0 - failed setup
2098  */
2099 int
2100 zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *erp_action)
2101 {
2102         int retval;
2103         int i;
2104         volatile struct qdio_buffer_element *sbale;
2105         struct zfcp_adapter *adapter = erp_action->adapter;
2106
2107         if (atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
2108                 ZFCP_LOG_NORMAL("bug: second attempt to set up QDIO on "
2109                                 "adapter %s\n",
2110                                 zfcp_get_busid_by_adapter(adapter));
2111                 goto failed_sanity;
2112         }
2113
2114         if (qdio_establish(&adapter->qdio_init_data) != 0) {
2115                 ZFCP_LOG_INFO("error: establishment of QDIO queues failed "
2116                               "on adapter %s\n",
2117                               zfcp_get_busid_by_adapter(adapter));
2118                 goto failed_qdio_establish;
2119         }
2120         debug_text_event(adapter->erp_dbf, 3, "qdio_est");
2121
2122         if (qdio_activate(adapter->ccw_device, 0) != 0) {
2123                 ZFCP_LOG_INFO("error: activation of QDIO queues failed "
2124                               "on adapter %s\n",
2125                               zfcp_get_busid_by_adapter(adapter));
2126                 goto failed_qdio_activate;
2127         }
2128         debug_text_event(adapter->erp_dbf, 3, "qdio_act");
2129
2130         /*
2131          * put buffers into response queue,
2132          */
2133         for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
2134                 sbale = &(adapter->response_queue.buffer[i]->element[0]);
2135                 sbale->length = 0;
2136                 sbale->flags = SBAL_FLAGS_LAST_ENTRY;
2137                 sbale->addr = 0;
2138         }
2139
2140         ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, "
2141                        "queue_no=%i, index_in_queue=%i, count=%i)\n",
2142                        zfcp_get_busid_by_adapter(adapter),
2143                        QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q);
2144
2145         retval = do_QDIO(adapter->ccw_device,
2146                          QDIO_FLAG_SYNC_INPUT,
2147                          0, 0, QDIO_MAX_BUFFERS_PER_Q, NULL);
2148
2149         if (retval) {
2150                 ZFCP_LOG_NORMAL("bug: setup of QDIO failed (retval=%d)\n",
2151                                 retval);
2152                 goto failed_do_qdio;
2153         } else {
2154                 adapter->response_queue.free_index = 0;
2155                 atomic_set(&adapter->response_queue.free_count, 0);
2156                 ZFCP_LOG_DEBUG("%i buffers successfully enqueued to "
2157                                "response queue\n", QDIO_MAX_BUFFERS_PER_Q);
2158         }
2159         /* set index of first avalable SBALS / number of available SBALS */
2160         adapter->request_queue.free_index = 0;
2161         atomic_set(&adapter->request_queue.free_count, QDIO_MAX_BUFFERS_PER_Q);
2162         adapter->request_queue.distance_from_int = 0;
2163
2164         /* initialize waitqueue used to wait for free SBALs in requests queue */
2165         init_waitqueue_head(&adapter->request_wq);
2166
2167         /* ok, we did it - skip all cleanups for different failures */
2168         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
2169         retval = ZFCP_ERP_SUCCEEDED;
2170         goto out;
2171
2172  failed_do_qdio:
2173         /* NOP */
2174
2175  failed_qdio_activate:
2176         debug_text_event(adapter->erp_dbf, 3, "qdio_down1a");
2177         while (qdio_shutdown(adapter->ccw_device,
2178                              QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS)
2179                 msleep(1000);
2180         debug_text_event(adapter->erp_dbf, 3, "qdio_down1b");
2181
2182  failed_qdio_establish:
2183  failed_sanity:
2184         retval = ZFCP_ERP_FAILED;
2185
2186  out:
2187         return retval;
2188 }
2189
2190 /*
2191  * function:    zfcp_qdio_cleanup
2192  *
2193  * purpose:     cleans up QDIO operation for the specified adapter
2194  *
2195  * returns:     0 - successful cleanup
2196  *              !0 - failed cleanup
2197  */
2198 int
2199 zfcp_erp_adapter_strategy_close_qdio(struct zfcp_erp_action *erp_action)
2200 {
2201         int retval = ZFCP_ERP_SUCCEEDED;
2202         int first_used;
2203         int used_count;
2204         struct zfcp_adapter *adapter = erp_action->adapter;
2205
2206         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
2207                 ZFCP_LOG_DEBUG("error: attempt to shut down inactive QDIO "
2208                                "queues on adapter %s\n",
2209                                zfcp_get_busid_by_adapter(adapter));
2210                 retval = ZFCP_ERP_FAILED;
2211                 goto out;
2212         }
2213
2214         /*
2215          * Get queue_lock and clear QDIOUP flag. Thus it's guaranteed that
2216          * do_QDIO won't be called while qdio_shutdown is in progress.
2217          */
2218
2219         write_lock_irq(&adapter->request_queue.queue_lock);
2220         atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
2221         write_unlock_irq(&adapter->request_queue.queue_lock);
2222
2223         debug_text_event(adapter->erp_dbf, 3, "qdio_down2a");
2224         while (qdio_shutdown(adapter->ccw_device,
2225                              QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS)
2226                 msleep(1000);
2227         debug_text_event(adapter->erp_dbf, 3, "qdio_down2b");
2228
2229         /*
2230          * First we had to stop QDIO operation.
2231          * Now it is safe to take the following actions.
2232          */
2233
2234         /* Cleanup only necessary when there are unacknowledged buffers */
2235         if (atomic_read(&adapter->request_queue.free_count)
2236             < QDIO_MAX_BUFFERS_PER_Q) {
2237                 first_used = (adapter->request_queue.free_index +
2238                               atomic_read(&adapter->request_queue.free_count))
2239                         % QDIO_MAX_BUFFERS_PER_Q;
2240                 used_count = QDIO_MAX_BUFFERS_PER_Q -
2241                         atomic_read(&adapter->request_queue.free_count);
2242                 zfcp_qdio_zero_sbals(adapter->request_queue.buffer,
2243                                      first_used, used_count);
2244         }
2245         adapter->response_queue.free_index = 0;
2246         atomic_set(&adapter->response_queue.free_count, 0);
2247         adapter->request_queue.free_index = 0;
2248         atomic_set(&adapter->request_queue.free_count, 0);
2249         adapter->request_queue.distance_from_int = 0;
2250  out:
2251         return retval;
2252 }
2253
2254 /*
2255  * function:    zfcp_fsf_init
2256  *
2257  * purpose:     initializes FSF operation for the specified adapter
2258  *
2259  * returns:     0 - succesful initialization of FSF operation
2260  *              !0 - failed to initialize FSF operation
2261  */
2262 static int
2263 zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *erp_action)
2264 {
2265         int retval;
2266
2267         /* do 'exchange configuration data' */
2268         retval = zfcp_erp_adapter_strategy_open_fsf_xconfig(erp_action);
2269         if (retval == ZFCP_ERP_FAILED)
2270                 return retval;
2271
2272         /* start the desired number of Status Reads */
2273         retval = zfcp_erp_adapter_strategy_open_fsf_statusread(erp_action);
2274         return retval;
2275 }
2276
2277 /*
2278  * function:
2279  *
2280  * purpose:
2281  *
2282  * returns:
2283  */
2284 static int
2285 zfcp_erp_adapter_strategy_open_fsf_xconfig(struct zfcp_erp_action *erp_action)
2286 {
2287         int retval = ZFCP_ERP_SUCCEEDED;
2288         int retries;
2289         struct zfcp_adapter *adapter = erp_action->adapter;
2290
2291         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
2292         retries = ZFCP_EXCHANGE_CONFIG_DATA_RETRIES;
2293
2294         do {
2295                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
2296                                   &adapter->status);
2297                 ZFCP_LOG_DEBUG("Doing exchange config data\n");
2298                 zfcp_erp_action_to_running(erp_action);
2299                 zfcp_erp_timeout_init(erp_action);
2300                 if (zfcp_fsf_exchange_config_data(erp_action)) {
2301                         retval = ZFCP_ERP_FAILED;
2302                         debug_text_event(adapter->erp_dbf, 5, "a_fstx_xf");
2303                         ZFCP_LOG_INFO("error:  initiation of exchange of "
2304                                       "configuration data failed for "
2305                                       "adapter %s\n",
2306                                       zfcp_get_busid_by_adapter(adapter));
2307                         break;
2308                 }
2309                 debug_text_event(adapter->erp_dbf, 6, "a_fstx_xok");
2310                 ZFCP_LOG_DEBUG("Xchange underway\n");
2311
2312                 /*
2313                  * Why this works:
2314                  * Both the normal completion handler as well as the timeout
2315                  * handler will do an 'up' when the 'exchange config data'
2316                  * request completes or times out. Thus, the signal to go on
2317                  * won't be lost utilizing this semaphore.
2318                  * Furthermore, this 'adapter_reopen' action is
2319                  * guaranteed to be the only action being there (highest action
2320                  * which prevents other actions from being created).
2321                  * Resulting from that, the wake signal recognized here
2322                  * _must_ be the one belonging to the 'exchange config
2323                  * data' request.
2324                  */
2325                 down(&adapter->erp_ready_sem);
2326                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
2327                         ZFCP_LOG_INFO("error: exchange of configuration data "
2328                                       "for adapter %s timed out\n",
2329                                       zfcp_get_busid_by_adapter(adapter));
2330                         break;
2331                 }
2332                 if (atomic_test_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
2333                                      &adapter->status)) {
2334                         ZFCP_LOG_DEBUG("host connection still initialising... "
2335                                        "waiting and retrying...\n");
2336                         /* sleep a little bit before retry */
2337                         msleep(jiffies_to_msecs(ZFCP_EXCHANGE_CONFIG_DATA_SLEEP));
2338                 }
2339         } while ((retries--) &&
2340                  atomic_test_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
2341                                   &adapter->status));
2342
2343         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2344                               &adapter->status)) {
2345                 ZFCP_LOG_INFO("error: exchange of configuration data for "
2346                               "adapter %s failed\n",
2347                               zfcp_get_busid_by_adapter(adapter));
2348                 retval = ZFCP_ERP_FAILED;
2349         }
2350
2351         return retval;
2352 }
2353
2354 /*
2355  * function:
2356  *
2357  * purpose:
2358  *
2359  * returns:
2360  */
2361 static int
2362 zfcp_erp_adapter_strategy_open_fsf_statusread(struct zfcp_erp_action
2363                                               *erp_action)
2364 {
2365         int retval = ZFCP_ERP_SUCCEEDED;
2366         int temp_ret;
2367         struct zfcp_adapter *adapter = erp_action->adapter;
2368         int i;
2369
2370         adapter->status_read_failed = 0;
2371         for (i = 0; i < ZFCP_STATUS_READS_RECOM; i++) {
2372                 temp_ret = zfcp_fsf_status_read(adapter, ZFCP_WAIT_FOR_SBAL);
2373                 if (temp_ret < 0) {
2374                         ZFCP_LOG_INFO("error: set-up of unsolicited status "
2375                                       "notification failed on adapter %s\n",
2376                                       zfcp_get_busid_by_adapter(adapter));
2377                         retval = ZFCP_ERP_FAILED;
2378                         i--;
2379                         break;
2380                 }
2381         }
2382
2383         return retval;
2384 }
2385
2386 /*
2387  * function:    zfcp_fsf_cleanup
2388  *
2389  * purpose:     cleanup FSF operation for specified adapter
2390  *
2391  * returns:     0 - FSF operation successfully cleaned up
2392  *              !0 - failed to cleanup FSF operation for this adapter
2393  */
2394 static int
2395 zfcp_erp_adapter_strategy_close_fsf(struct zfcp_erp_action *erp_action)
2396 {
2397         int retval = ZFCP_ERP_SUCCEEDED;
2398         struct zfcp_adapter *adapter = erp_action->adapter;
2399
2400         /*
2401          * wake waiting initiators of requests,
2402          * return SCSI commands (with error status),
2403          * clean up all requests (synchronously)
2404          */
2405         zfcp_fsf_req_dismiss_all(adapter);
2406         /* reset FSF request sequence number */
2407         adapter->fsf_req_seq_no = 0;
2408         /* all ports and units are closed */
2409         zfcp_erp_modify_adapter_status(adapter,
2410                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
2411
2412         return retval;
2413 }
2414
2415 /*
2416  * function:
2417  *
2418  * purpose:     this routine executes the 'Reopen Physical Port' action
2419  *
2420  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
2421  *              ZFCP_ERP_SUCCEEDED      - action finished successfully
2422  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
2423  */
2424 static int
2425 zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
2426 {
2427         int retval = ZFCP_ERP_FAILED;
2428         struct zfcp_port *port = erp_action->port;
2429         struct zfcp_adapter *adapter = erp_action->adapter;
2430
2431         switch (erp_action->step) {
2432
2433                 /*
2434                  * FIXME:
2435                  * the ULP spec. begs for waiting for oustanding commands
2436                  */
2437         case ZFCP_ERP_STEP_UNINITIALIZED:
2438                 zfcp_erp_port_strategy_clearstati(port);
2439                 /*
2440                  * it would be sufficient to test only the normal open flag
2441                  * since the phys. open flag cannot be set if the normal
2442                  * open flag is unset - however, this is for readabilty ...
2443                  */
2444                 if (atomic_test_mask((ZFCP_STATUS_PORT_PHYS_OPEN |
2445                                       ZFCP_STATUS_COMMON_OPEN),
2446                                      &port->status)) {
2447                         ZFCP_LOG_DEBUG("port 0x%016Lx is open -> trying "
2448                                        "close physical\n", port->wwpn);
2449                         retval =
2450                             zfcp_erp_port_forced_strategy_close(erp_action);
2451                 } else
2452                         retval = ZFCP_ERP_FAILED;
2453                 break;
2454
2455         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
2456                 if (atomic_test_mask(ZFCP_STATUS_PORT_PHYS_OPEN,
2457                                      &port->status)) {
2458                         ZFCP_LOG_DEBUG("close physical failed for port "
2459                                        "0x%016Lx\n", port->wwpn);
2460                         retval = ZFCP_ERP_FAILED;
2461                 } else
2462                         retval = ZFCP_ERP_SUCCEEDED;
2463                 break;
2464         }
2465
2466         debug_text_event(adapter->erp_dbf, 3, "p_pfst/ret");
2467         debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof (wwn_t));
2468         debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
2469         debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
2470
2471         return retval;
2472 }
2473
2474 /*
2475  * function:
2476  *
2477  * purpose:     this routine executes the 'Reopen Port' action
2478  *
2479  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
2480  *              ZFCP_ERP_SUCCEEDED      - action finished successfully
2481  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
2482  */
2483 static int
2484 zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
2485 {
2486         int retval = ZFCP_ERP_FAILED;
2487         struct zfcp_port *port = erp_action->port;
2488         struct zfcp_adapter *adapter = erp_action->adapter;
2489
2490         switch (erp_action->step) {
2491
2492                 /*
2493                  * FIXME:
2494                  * the ULP spec. begs for waiting for oustanding commands
2495                  */
2496         case ZFCP_ERP_STEP_UNINITIALIZED:
2497                 zfcp_erp_port_strategy_clearstati(port);
2498                 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &port->status)) {
2499                         ZFCP_LOG_DEBUG("port 0x%016Lx is open -> trying "
2500                                        "close\n", port->wwpn);
2501                         retval = zfcp_erp_port_strategy_close(erp_action);
2502                         goto out;
2503                 }               /* else it's already closed, open it */
2504                 break;
2505
2506         case ZFCP_ERP_STEP_PORT_CLOSING:
2507                 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &port->status)) {
2508                         ZFCP_LOG_DEBUG("close failed for port 0x%016Lx\n",
2509                                        port->wwpn);
2510                         retval = ZFCP_ERP_FAILED;
2511                         goto out;
2512                 }               /* else it's closed now, open it */
2513                 break;
2514         }
2515         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
2516                 retval = ZFCP_ERP_EXIT;
2517         else
2518                 retval = zfcp_erp_port_strategy_open(erp_action);
2519
2520  out:
2521         debug_text_event(adapter->erp_dbf, 3, "p_pst/ret");
2522         debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof (wwn_t));
2523         debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
2524         debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
2525
2526         return retval;
2527 }
2528
2529 /*
2530  * function:
2531  *
2532  * purpose:
2533  *
2534  * returns:
2535  */
2536 static int
2537 zfcp_erp_port_strategy_open(struct zfcp_erp_action *erp_action)
2538 {
2539         int retval;
2540
2541         if (atomic_test_mask(ZFCP_STATUS_PORT_WKA,
2542                              &erp_action->port->status))
2543                 retval = zfcp_erp_port_strategy_open_nameserver(erp_action);
2544         else
2545                 retval = zfcp_erp_port_strategy_open_common(erp_action);
2546
2547         return retval;
2548 }
2549
2550 /*
2551  * function:
2552  *
2553  * purpose:
2554  *
2555  * returns:
2556  *
2557  * FIXME(design):       currently only prepared for fabric (nameserver!)
2558  */
2559 static int
2560 zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *erp_action)
2561 {
2562         int retval = 0;
2563         struct zfcp_adapter *adapter = erp_action->adapter;
2564         struct zfcp_port *port = erp_action->port;
2565
2566         switch (erp_action->step) {
2567
2568         case ZFCP_ERP_STEP_UNINITIALIZED:
2569         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
2570         case ZFCP_ERP_STEP_PORT_CLOSING:
2571                 if (!(adapter->nameserver_port)) {
2572                         retval = zfcp_nameserver_enqueue(adapter);
2573                         if (retval != 0) {
2574                                 ZFCP_LOG_NORMAL("error: nameserver port "
2575                                                 "unavailable for adapter %s\n",
2576                                                 zfcp_get_busid_by_adapter(adapter));
2577                                 retval = ZFCP_ERP_FAILED;
2578                                 break;
2579                         }
2580                 }
2581                 if (!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
2582                                       &adapter->nameserver_port->status)) {
2583                         ZFCP_LOG_DEBUG("nameserver port is not open -> open "
2584                                        "nameserver port\n");
2585                         /* nameserver port may live again */
2586                         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING,
2587                                         &adapter->nameserver_port->status);
2588                         if (zfcp_erp_port_reopen(adapter->nameserver_port, 0)
2589                             >= 0) {
2590                                 erp_action->step =
2591                                         ZFCP_ERP_STEP_NAMESERVER_OPEN;
2592                                 retval = ZFCP_ERP_CONTINUES;
2593                         } else
2594                                 retval = ZFCP_ERP_FAILED;
2595                         break;
2596                 }
2597                 /* else nameserver port is already open, fall through */
2598         case ZFCP_ERP_STEP_NAMESERVER_OPEN:
2599                 if (!atomic_test_mask(ZFCP_STATUS_COMMON_OPEN,
2600                                       &adapter->nameserver_port->status)) {
2601                         ZFCP_LOG_DEBUG("open failed for nameserver port\n");
2602                         retval = ZFCP_ERP_FAILED;
2603                 } else {
2604                         ZFCP_LOG_DEBUG("nameserver port is open -> "
2605                                        "nameserver look-up for port 0x%016Lx\n",
2606                                        port->wwpn);
2607                         retval = zfcp_erp_port_strategy_open_common_lookup
2608                                 (erp_action);
2609                 }
2610                 break;
2611
2612         case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
2613                 if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status)) {
2614                         if (atomic_test_mask
2615                             (ZFCP_STATUS_PORT_INVALID_WWPN, &port->status)) {
2616                                 ZFCP_LOG_DEBUG("nameserver look-up failed "
2617                                                "for port 0x%016Lx "
2618                                                "(misconfigured WWPN?)\n",
2619                                                port->wwpn);
2620                                 zfcp_erp_port_failed(port);
2621                                 retval = ZFCP_ERP_EXIT;
2622                         } else {
2623                                 ZFCP_LOG_DEBUG("nameserver look-up failed for "
2624                                                "port 0x%016Lx\n", port->wwpn);
2625                                 retval = ZFCP_ERP_FAILED;
2626                         }
2627                 } else {
2628                         ZFCP_LOG_DEBUG("port 0x%016Lx has d_id=0x%08x -> "
2629                                        "trying open\n", port->wwpn, port->d_id);
2630                         retval = zfcp_erp_port_strategy_open_port(erp_action);
2631                 }
2632                 break;
2633
2634         case ZFCP_ERP_STEP_PORT_OPENING:
2635                 /* D_ID might have changed during open */
2636                 if (atomic_test_mask((ZFCP_STATUS_COMMON_OPEN |
2637                                       ZFCP_STATUS_PORT_DID_DID),
2638                                      &port->status)) {
2639                         ZFCP_LOG_DEBUG("port 0x%016Lx is open\n", port->wwpn);
2640                         retval = ZFCP_ERP_SUCCEEDED;
2641                 } else {
2642                         ZFCP_LOG_DEBUG("open failed for port 0x%016Lx\n",
2643                                        port->wwpn);
2644                         retval = ZFCP_ERP_FAILED;
2645                 }
2646                 break;
2647
2648         default:
2649                 ZFCP_LOG_NORMAL("bug: unknown erp step 0x%08x\n",
2650                                 erp_action->step);
2651                 retval = ZFCP_ERP_FAILED;
2652         }
2653
2654         return retval;
2655 }
2656
2657 /*
2658  * function:
2659  *
2660  * purpose:
2661  *
2662  * returns:
2663  */
2664 static int
2665 zfcp_erp_port_strategy_open_nameserver(struct zfcp_erp_action *erp_action)
2666 {
2667         int retval;
2668         struct zfcp_port *port = erp_action->port;
2669
2670         switch (erp_action->step) {
2671
2672         case ZFCP_ERP_STEP_UNINITIALIZED:
2673         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
2674         case ZFCP_ERP_STEP_PORT_CLOSING:
2675                 ZFCP_LOG_DEBUG("port 0x%016Lx has d_id=0x%08x -> trying open\n",
2676                                port->wwpn, port->d_id);
2677                 retval = zfcp_erp_port_strategy_open_port(erp_action);
2678                 break;
2679
2680         case ZFCP_ERP_STEP_PORT_OPENING:
2681                 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &port->status)) {
2682                         ZFCP_LOG_DEBUG("WKA port is open\n");
2683                         retval = ZFCP_ERP_SUCCEEDED;
2684                 } else {
2685                         ZFCP_LOG_DEBUG("open failed for WKA port\n");
2686                         retval = ZFCP_ERP_FAILED;
2687                 }
2688                 /* this is needed anyway (dont care for retval of wakeup) */
2689                 ZFCP_LOG_DEBUG("continue other open port operations\n");
2690                 zfcp_erp_port_strategy_open_nameserver_wakeup(erp_action);
2691                 break;
2692
2693         default:
2694                 ZFCP_LOG_NORMAL("bug: unknown erp step 0x%08x\n",
2695                                 erp_action->step);
2696                 retval = ZFCP_ERP_FAILED;
2697         }
2698
2699         return retval;
2700 }
2701
2702 /*
2703  * function:
2704  *
2705  * purpose:     makes the erp thread continue with reopen (physical) port
2706  *              actions which have been paused until the name server port
2707  *              is opened (or failed)
2708  *
2709  * returns:     0       (a kind of void retval, its not used)
2710  */
2711 static int
2712 zfcp_erp_port_strategy_open_nameserver_wakeup(struct zfcp_erp_action
2713                                               *ns_erp_action)
2714 {
2715         int retval = 0;
2716         unsigned long flags;
2717         struct zfcp_adapter *adapter = ns_erp_action->adapter;
2718         struct zfcp_erp_action *erp_action, *tmp;
2719
2720         read_lock_irqsave(&adapter->erp_lock, flags);
2721         list_for_each_entry_safe(erp_action, tmp, &adapter->erp_running_head,
2722                                  list) {
2723                 debug_text_event(adapter->erp_dbf, 4, "p_pstnsw_n");
2724                 debug_event(adapter->erp_dbf, 4, &erp_action->port->wwpn,
2725                             sizeof (wwn_t));
2726                 if (erp_action->step == ZFCP_ERP_STEP_NAMESERVER_OPEN) {
2727                         debug_text_event(adapter->erp_dbf, 3, "p_pstnsw_w");
2728                         debug_event(adapter->erp_dbf, 3,
2729                                     &erp_action->port->wwpn, sizeof (wwn_t));
2730                         if (atomic_test_mask(
2731                                     ZFCP_STATUS_COMMON_ERP_FAILED,
2732                                     &adapter->nameserver_port->status))
2733                                 zfcp_erp_port_failed(erp_action->port);
2734                         zfcp_erp_action_ready(erp_action);
2735                 }
2736         }
2737         read_unlock_irqrestore(&adapter->erp_lock, flags);
2738
2739         return retval;
2740 }
2741
2742 /*
2743  * function:
2744  *
2745  * purpose:
2746  *
2747  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
2748  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
2749  */
2750 static int
2751 zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *erp_action)
2752 {
2753         int retval;
2754         struct zfcp_adapter *adapter = erp_action->adapter;
2755         struct zfcp_port *port = erp_action->port;
2756
2757         zfcp_erp_timeout_init(erp_action);
2758         retval = zfcp_fsf_close_physical_port(erp_action);
2759         if (retval == -ENOMEM) {
2760                 debug_text_event(adapter->erp_dbf, 5, "o_pfstc_nomem");
2761                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2762                 retval = ZFCP_ERP_NOMEM;
2763                 goto out;
2764         }
2765         erp_action->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
2766         if (retval != 0) {
2767                 debug_text_event(adapter->erp_dbf, 5, "o_pfstc_cpf");
2768                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2769                 /* could not send 'open', fail */
2770                 retval = ZFCP_ERP_FAILED;
2771                 goto out;
2772         }
2773         debug_text_event(adapter->erp_dbf, 6, "o_pfstc_cpok");
2774         debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
2775         retval = ZFCP_ERP_CONTINUES;
2776  out:
2777         return retval;
2778 }
2779
2780 /*
2781  * function:
2782  *
2783  * purpose:
2784  *
2785  * returns:
2786  */
2787 static int
2788 zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
2789 {
2790         int retval = 0;
2791         struct zfcp_adapter *adapter = port->adapter;
2792
2793         debug_text_event(adapter->erp_dbf, 5, "p_pstclst");
2794         debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2795
2796         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING |
2797                           ZFCP_STATUS_COMMON_CLOSING |
2798                           ZFCP_STATUS_COMMON_ACCESS_DENIED |
2799                           ZFCP_STATUS_PORT_DID_DID |
2800                           ZFCP_STATUS_PORT_PHYS_CLOSING |
2801                           ZFCP_STATUS_PORT_INVALID_WWPN,
2802                           &port->status);
2803         return retval;
2804 }
2805
2806 /*
2807  * function:
2808  *
2809  * purpose:
2810  *
2811  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
2812  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
2813  */
2814 static int
2815 zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
2816 {
2817         int retval;
2818         struct zfcp_adapter *adapter = erp_action->adapter;
2819         struct zfcp_port *port = erp_action->port;
2820
2821         zfcp_erp_timeout_init(erp_action);
2822         retval = zfcp_fsf_close_port(erp_action);
2823         if (retval == -ENOMEM) {
2824                 debug_text_event(adapter->erp_dbf, 5, "p_pstc_nomem");
2825                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2826                 retval = ZFCP_ERP_NOMEM;
2827                 goto out;
2828         }
2829         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
2830         if (retval != 0) {
2831                 debug_text_event(adapter->erp_dbf, 5, "p_pstc_cpf");
2832                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2833                 /* could not send 'close', fail */
2834                 retval = ZFCP_ERP_FAILED;
2835                 goto out;
2836         }
2837         debug_text_event(adapter->erp_dbf, 6, "p_pstc_cpok");
2838         debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
2839         retval = ZFCP_ERP_CONTINUES;
2840  out:
2841         return retval;
2842 }
2843
2844 /*
2845  * function:
2846  *
2847  * purpose:
2848  *
2849  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
2850  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
2851  */
2852 static int
2853 zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
2854 {
2855         int retval;
2856         struct zfcp_adapter *adapter = erp_action->adapter;
2857         struct zfcp_port *port = erp_action->port;
2858
2859         zfcp_erp_timeout_init(erp_action);
2860         retval = zfcp_fsf_open_port(erp_action);
2861         if (retval == -ENOMEM) {
2862                 debug_text_event(adapter->erp_dbf, 5, "p_psto_nomem");
2863                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2864                 retval = ZFCP_ERP_NOMEM;
2865                 goto out;
2866         }
2867         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
2868         if (retval != 0) {
2869                 debug_text_event(adapter->erp_dbf, 5, "p_psto_opf");
2870                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2871                 /* could not send 'open', fail */
2872                 retval = ZFCP_ERP_FAILED;
2873                 goto out;
2874         }
2875         debug_text_event(adapter->erp_dbf, 6, "p_psto_opok");
2876         debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
2877         retval = ZFCP_ERP_CONTINUES;
2878  out:
2879         return retval;
2880 }
2881
2882 /*
2883  * function:
2884  *
2885  * purpose:
2886  *
2887  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
2888  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
2889  */
2890 static int
2891 zfcp_erp_port_strategy_open_common_lookup(struct zfcp_erp_action *erp_action)
2892 {
2893         int retval;
2894         struct zfcp_adapter *adapter = erp_action->adapter;
2895         struct zfcp_port *port = erp_action->port;
2896
2897         zfcp_erp_timeout_init(erp_action);
2898         retval = zfcp_ns_gid_pn_request(erp_action);
2899         if (retval == -ENOMEM) {
2900                 debug_text_event(adapter->erp_dbf, 5, "p_pstn_nomem");
2901                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2902                 retval = ZFCP_ERP_NOMEM;
2903                 goto out;
2904         }
2905         erp_action->step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
2906         if (retval != 0) {
2907                 debug_text_event(adapter->erp_dbf, 5, "p_pstn_ref");
2908                 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2909                 /* could not send nameserver request, fail */
2910                 retval = ZFCP_ERP_FAILED;
2911                 goto out;
2912         }
2913         debug_text_event(adapter->erp_dbf, 6, "p_pstn_reok");
2914         debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
2915         retval = ZFCP_ERP_CONTINUES;
2916  out:
2917         return retval;
2918 }
2919
2920 /*
2921  * function:
2922  *
2923  * purpose:     this routine executes the 'Reopen Unit' action
2924  *              currently no retries
2925  *
2926  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
2927  *              ZFCP_ERP_SUCCEEDED      - action finished successfully
2928  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
2929  */
2930 static int
2931 zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
2932 {
2933         int retval = ZFCP_ERP_FAILED;
2934         struct zfcp_unit *unit = erp_action->unit;
2935         struct zfcp_adapter *adapter = erp_action->adapter;
2936
2937         switch (erp_action->step) {
2938
2939                 /*
2940                  * FIXME:
2941                  * the ULP spec. begs for waiting for oustanding commands
2942                  */
2943         case ZFCP_ERP_STEP_UNINITIALIZED:
2944                 zfcp_erp_unit_strategy_clearstati(unit);
2945                 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status)) {
2946                         ZFCP_LOG_DEBUG("unit 0x%016Lx is open -> "
2947                                        "trying close\n", unit->fcp_lun);
2948                         retval = zfcp_erp_unit_strategy_close(erp_action);
2949                         break;
2950                 }
2951                 /* else it's already closed, fall through */
2952         case ZFCP_ERP_STEP_UNIT_CLOSING:
2953                 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status)) {
2954                         ZFCP_LOG_DEBUG("close failed for unit 0x%016Lx\n",
2955                                        unit->fcp_lun);
2956                         retval = ZFCP_ERP_FAILED;
2957                 } else {
2958                         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
2959                                 retval = ZFCP_ERP_EXIT;
2960                         else {
2961                                 ZFCP_LOG_DEBUG("unit 0x%016Lx is not open -> "
2962                                                "trying open\n", unit->fcp_lun);
2963                                 retval =
2964                                     zfcp_erp_unit_strategy_open(erp_action);
2965                         }
2966                 }
2967                 break;
2968
2969         case ZFCP_ERP_STEP_UNIT_OPENING:
2970                 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status)) {
2971                         ZFCP_LOG_DEBUG("unit 0x%016Lx is open\n",
2972                                        unit->fcp_lun);
2973                         retval = ZFCP_ERP_SUCCEEDED;
2974                 } else {
2975                         ZFCP_LOG_DEBUG("open failed for unit 0x%016Lx\n",
2976                                        unit->fcp_lun);
2977                         retval = ZFCP_ERP_FAILED;
2978                 }
2979                 break;
2980         }
2981
2982         debug_text_event(adapter->erp_dbf, 3, "u_ust/ret");
2983         debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof (fcp_lun_t));
2984         debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
2985         debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
2986         return retval;
2987 }
2988
2989 /*
2990  * function:
2991  *
2992  * purpose:
2993  *
2994  * returns:
2995  */
2996 static int
2997 zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
2998 {
2999         int retval = 0;
3000         struct zfcp_adapter *adapter = unit->port->adapter;
3001
3002         debug_text_event(adapter->erp_dbf, 5, "u_ustclst");
3003         debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t));
3004
3005         atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING |
3006                           ZFCP_STATUS_COMMON_CLOSING |
3007                           ZFCP_STATUS_COMMON_ACCESS_DENIED |
3008                           ZFCP_STATUS_UNIT_SHARED |
3009                           ZFCP_STATUS_UNIT_READONLY,
3010                           &unit->status);
3011
3012         return retval;
3013 }
3014
3015 /*
3016  * function:
3017  *
3018  * purpose:
3019  *
3020  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
3021  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
3022  */
3023 static int
3024 zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
3025 {
3026         int retval;
3027         struct zfcp_adapter *adapter = erp_action->adapter;
3028         struct zfcp_unit *unit = erp_action->unit;
3029
3030         zfcp_erp_timeout_init(erp_action);
3031         retval = zfcp_fsf_close_unit(erp_action);
3032         if (retval == -ENOMEM) {
3033                 debug_text_event(adapter->erp_dbf, 5, "u_ustc_nomem");
3034                 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
3035                             sizeof (fcp_lun_t));
3036                 retval = ZFCP_ERP_NOMEM;
3037                 goto out;
3038         }
3039         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
3040         if (retval != 0) {
3041                 debug_text_event(adapter->erp_dbf, 5, "u_ustc_cuf");
3042                 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
3043                             sizeof (fcp_lun_t));
3044                 /* could not send 'close', fail */
3045                 retval = ZFCP_ERP_FAILED;
3046                 goto out;
3047         }
3048         debug_text_event(adapter->erp_dbf, 6, "u_ustc_cuok");
3049         debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
3050         retval = ZFCP_ERP_CONTINUES;
3051
3052  out:
3053         return retval;
3054 }
3055
3056 /*
3057  * function:
3058  *
3059  * purpose:
3060  *
3061  * returns:     ZFCP_ERP_CONTINUES      - action continues (asynchronously)
3062  *              ZFCP_ERP_FAILED         - action finished unsuccessfully
3063  */
3064 static int
3065 zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
3066 {
3067         int retval;
3068         struct zfcp_adapter *adapter = erp_action->adapter;
3069         struct zfcp_unit *unit = erp_action->unit;
3070
3071         zfcp_erp_timeout_init(erp_action);
3072         retval = zfcp_fsf_open_unit(erp_action);
3073         if (retval == -ENOMEM) {
3074                 debug_text_event(adapter->erp_dbf, 5, "u_usto_nomem");
3075                 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
3076                             sizeof (fcp_lun_t));
3077                 retval = ZFCP_ERP_NOMEM;
3078                 goto out;
3079         }
3080         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
3081         if (retval != 0) {
3082                 debug_text_event(adapter->erp_dbf, 5, "u_usto_ouf");
3083                 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
3084                             sizeof (fcp_lun_t));
3085                 /* could not send 'open', fail */
3086                 retval = ZFCP_ERP_FAILED;
3087                 goto out;
3088         }
3089         debug_text_event(adapter->erp_dbf, 6, "u_usto_ouok");
3090         debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
3091         retval = ZFCP_ERP_CONTINUES;
3092  out:
3093         return retval;
3094 }
3095
3096 /*
3097  * function:
3098  *
3099  * purpose:
3100  *
3101  * returns:
3102  */
3103 static inline void
3104 zfcp_erp_timeout_init(struct zfcp_erp_action *erp_action)
3105 {
3106         init_timer(&erp_action->timer);
3107         erp_action->timer.function = zfcp_erp_timeout_handler;
3108         erp_action->timer.data = (unsigned long) erp_action;
3109         /* jiffies will be added in zfcp_fsf_req_send */
3110         erp_action->timer.expires = ZFCP_ERP_FSFREQ_TIMEOUT;
3111 }
3112
3113 /*
3114  * function:
3115  *
3116  * purpose:     enqueue the specified error recovery action, if needed
3117  *
3118  * returns:
3119  */
3120 static int
3121 zfcp_erp_action_enqueue(int action,
3122                         struct zfcp_adapter *adapter,
3123                         struct zfcp_port *port, struct zfcp_unit *unit)
3124 {
3125         int retval = 1;
3126         struct zfcp_erp_action *erp_action = NULL;
3127         int stronger_action = 0;
3128         u32 status = 0;
3129
3130         /*
3131          * We need some rules here which check whether we really need
3132          * this action or whether we should just drop it.
3133          * E.g. if there is a unfinished 'Reopen Port' request then we drop a
3134          * 'Reopen Unit' request for an associated unit since we can't
3135          * satisfy this request now. A 'Reopen Port' action will trigger
3136          * 'Reopen Unit' actions when it completes.
3137          * Thus, there are only actions in the queue which can immediately be
3138          * executed. This makes the processing of the action queue more
3139          * efficient.
3140          */
3141
3142         if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
3143                               &adapter->status))
3144                 return -EIO;
3145
3146         debug_event(adapter->erp_dbf, 4, &action, sizeof (int));
3147         /* check whether we really need this */
3148         switch (action) {
3149         case ZFCP_ERP_ACTION_REOPEN_UNIT:
3150                 if (atomic_test_mask
3151                     (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status)) {
3152                         debug_text_event(adapter->erp_dbf, 4, "u_actenq_drp");
3153                         debug_event(adapter->erp_dbf, 4, &port->wwpn,
3154                                     sizeof (wwn_t));
3155                         debug_event(adapter->erp_dbf, 4, &unit->fcp_lun,
3156                                     sizeof (fcp_lun_t));
3157                         goto out;
3158                 }
3159                 if (!atomic_test_mask
3160                     (ZFCP_STATUS_COMMON_RUNNING, &port->status) ||
3161                     atomic_test_mask
3162                     (ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
3163                         goto out;
3164                 }
3165                 if (!atomic_test_mask
3166                     (ZFCP_STATUS_COMMON_UNBLOCKED, &port->status)) {
3167                         stronger_action = ZFCP_ERP_ACTION_REOPEN_PORT;
3168                         unit = NULL;
3169                 }
3170                 /* fall through !!! */
3171
3172         case ZFCP_ERP_ACTION_REOPEN_PORT:
3173                 if (atomic_test_mask
3174                     (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status)) {
3175                         debug_text_event(adapter->erp_dbf, 4, "p_actenq_drp");
3176                         debug_event(adapter->erp_dbf, 4, &port->wwpn,
3177                                     sizeof (wwn_t));
3178                         goto out;
3179                 }
3180                 /* fall through !!! */
3181
3182         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
3183                 if (atomic_test_mask
3184                     (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status)
3185                     && port->erp_action.action ==
3186                     ZFCP_ERP_ACTION_REOPEN_PORT_FORCED) {
3187                         debug_text_event(adapter->erp_dbf, 4, "pf_actenq_drp");
3188                         debug_event(adapter->erp_dbf, 4, &port->wwpn,
3189                                     sizeof (wwn_t));
3190                         goto out;
3191                 }
3192                 if (!atomic_test_mask
3193                     (ZFCP_STATUS_COMMON_RUNNING, &adapter->status) ||
3194                     atomic_test_mask
3195                     (ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) {
3196                         goto out;
3197                 }
3198                 if (!atomic_test_mask
3199                     (ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status)) {
3200                         stronger_action = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
3201                         port = NULL;
3202                 }
3203                 /* fall through !!! */
3204
3205         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
3206                 if (atomic_test_mask
3207                     (ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status)) {
3208                         debug_text_event(adapter->erp_dbf, 4, "a_actenq_drp");
3209                         goto out;
3210                 }
3211                 break;
3212
3213         default:
3214                 debug_text_exception(adapter->erp_dbf, 1, "a_actenq_bug");
3215                 debug_event(adapter->erp_dbf, 1, &action, sizeof (int));
3216                 ZFCP_LOG_NORMAL("bug: unknown erp action requested "
3217                                 "on adapter %s (action=%d)\n",
3218                                 zfcp_get_busid_by_adapter(adapter), action);
3219                 goto out;
3220         }
3221
3222         /* check whether we need something stronger first */
3223         if (stronger_action) {
3224                 debug_text_event(adapter->erp_dbf, 4, "a_actenq_str");
3225                 debug_event(adapter->erp_dbf, 4, &stronger_action,
3226                             sizeof (int));
3227                 ZFCP_LOG_DEBUG("stronger erp action %d needed before "
3228                                "erp action %d on adapter %s\n",
3229                                stronger_action, action,
3230                                zfcp_get_busid_by_adapter(adapter));
3231                 action = stronger_action;
3232         }
3233
3234         /* mark adapter to have some error recovery pending */
3235         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
3236
3237         /* setup error recovery action */
3238         switch (action) {
3239
3240         case ZFCP_ERP_ACTION_REOPEN_UNIT:
3241                 zfcp_unit_get(unit);
3242                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
3243                 erp_action = &unit->erp_action;
3244                 if (!atomic_test_mask
3245                     (ZFCP_STATUS_COMMON_RUNNING, &unit->status))
3246                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
3247                 break;
3248
3249         case ZFCP_ERP_ACTION_REOPEN_PORT:
3250         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
3251                 zfcp_port_get(port);
3252                 zfcp_erp_action_dismiss_port(port);
3253                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
3254                 erp_action = &port->erp_action;
3255                 if (!atomic_test_mask
3256                     (ZFCP_STATUS_COMMON_RUNNING, &port->status))
3257                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
3258                 break;
3259
3260         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
3261                 zfcp_adapter_get(adapter);
3262                 zfcp_erp_action_dismiss_adapter(adapter);
3263                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
3264                 erp_action = &adapter->erp_action;
3265                 if (!atomic_test_mask
3266                     (ZFCP_STATUS_COMMON_RUNNING, &adapter->status))
3267                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
3268                 break;
3269         }
3270
3271         debug_text_event(adapter->erp_dbf, 4, "a_actenq");
3272
3273         memset(erp_action, 0, sizeof (struct zfcp_erp_action));
3274         erp_action->adapter = adapter;
3275         erp_action->port = port;
3276         erp_action->unit = unit;
3277         erp_action->action = action;
3278         erp_action->status = status;
3279
3280         ++adapter->erp_total_count;
3281
3282         /* finally put it into 'ready' queue and kick erp thread */
3283         list_add(&erp_action->list, &adapter->erp_ready_head);
3284         up(&adapter->erp_ready_sem);
3285         retval = 0;
3286  out:
3287         return retval;
3288 }
3289
3290 /*
3291  * function:
3292  *
3293  * purpose:
3294  *
3295  * returns:
3296  */
3297 static int
3298 zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
3299 {
3300         int retval = 0;
3301         struct zfcp_adapter *adapter = erp_action->adapter;
3302
3303         --adapter->erp_total_count;
3304         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
3305                 --adapter->erp_low_mem_count;
3306                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
3307         }
3308
3309         debug_text_event(adapter->erp_dbf, 4, "a_actdeq");
3310         debug_event(adapter->erp_dbf, 4, &erp_action->action, sizeof (int));
3311         list_del(&erp_action->list);
3312         switch (erp_action->action) {
3313         case ZFCP_ERP_ACTION_REOPEN_UNIT:
3314                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
3315                                   &erp_action->unit->status);
3316                 break;
3317         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
3318         case ZFCP_ERP_ACTION_REOPEN_PORT:
3319                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
3320                                   &erp_action->port->status);
3321                 break;
3322         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
3323                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
3324                                   &erp_action->adapter->status);
3325                 break;
3326         default:
3327                 /* bug */
3328                 break;
3329         }
3330         return retval;
3331 }
3332
3333 /**
3334  * zfcp_erp_action_cleanup
3335  *
3336  * Register unit with scsi stack if appropiate and fix reference counts.
3337  * Note: Temporary units are not registered with scsi stack.
3338  */
3339 static void
3340 zfcp_erp_action_cleanup(int action, struct zfcp_adapter *adapter,
3341                         struct zfcp_port *port, struct zfcp_unit *unit,
3342                         int result)
3343 {
3344         switch (action) {
3345         case ZFCP_ERP_ACTION_REOPEN_UNIT:
3346                 if ((result == ZFCP_ERP_SUCCEEDED)
3347                     && (!atomic_test_mask(ZFCP_STATUS_UNIT_TEMPORARY,
3348                                           &unit->status))
3349                     && (!unit->device))
3350                         scsi_add_device(unit->port->adapter->scsi_host, 0,
3351                                         unit->port->scsi_id, unit->scsi_lun);
3352                 zfcp_unit_put(unit);
3353                 break;
3354         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
3355         case ZFCP_ERP_ACTION_REOPEN_PORT:
3356                 zfcp_port_put(port);
3357                 break;
3358         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
3359                 zfcp_adapter_put(adapter);
3360                 break;
3361         default:
3362                 break;
3363         }
3364 }
3365
3366
3367 /*
3368  * function:
3369  *
3370  * purpose:
3371  *
3372  * returns:     FIXME
3373  */
3374 static int
3375 zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
3376 {
3377         int retval = 0;
3378         struct zfcp_port *port;
3379
3380         debug_text_event(adapter->erp_dbf, 5, "a_actab");
3381         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status))
3382                 zfcp_erp_action_dismiss(&adapter->erp_action);
3383         else
3384                 list_for_each_entry(port, &adapter->port_list_head, list)
3385                     zfcp_erp_action_dismiss_port(port);
3386
3387         return retval;
3388 }
3389
3390 /*
3391  * function:
3392  *
3393  * purpose:
3394  *
3395  * returns:     FIXME
3396  */
3397 static int
3398 zfcp_erp_action_dismiss_port(struct zfcp_port *port)
3399 {
3400         int retval = 0;
3401         struct zfcp_unit *unit;
3402         struct zfcp_adapter *adapter = port->adapter;
3403
3404         debug_text_event(adapter->erp_dbf, 5, "p_actab");
3405         debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
3406         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status))
3407                 zfcp_erp_action_dismiss(&port->erp_action);
3408         else
3409                 list_for_each_entry(unit, &port->unit_list_head, list)
3410                     zfcp_erp_action_dismiss_unit(unit);
3411
3412         return retval;
3413 }
3414
3415 /*
3416  * function:
3417  *
3418  * purpose:
3419  *
3420  * returns:     FIXME
3421  */
3422 static int
3423 zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
3424 {
3425         int retval = 0;
3426         struct zfcp_adapter *adapter = unit->port->adapter;
3427
3428         debug_text_event(adapter->erp_dbf, 5, "u_actab");
3429         debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t));
3430         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status))
3431                 zfcp_erp_action_dismiss(&unit->erp_action);
3432
3433         return retval;
3434 }
3435
3436 /*
3437  * function:
3438  *
3439  * purpose:     moves erp_action to 'erp running list'
3440  *
3441  * returns:
3442  */
3443 static inline void
3444 zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
3445 {
3446         struct zfcp_adapter *adapter = erp_action->adapter;
3447
3448         debug_text_event(adapter->erp_dbf, 6, "a_toru");
3449         debug_event(adapter->erp_dbf, 6, &erp_action->action, sizeof (int));
3450         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
3451 }
3452
3453 /*
3454  * function:
3455  *
3456  * purpose:     moves erp_action to 'erp ready list'
3457  *
3458  * returns:
3459  */
3460 static inline void
3461 zfcp_erp_action_to_ready(struct zfcp_erp_action *erp_action)
3462 {
3463         struct zfcp_adapter *adapter = erp_action->adapter;
3464
3465         debug_text_event(adapter->erp_dbf, 6, "a_tore");
3466         debug_event(adapter->erp_dbf, 6, &erp_action->action, sizeof (int));
3467         list_move(&erp_action->list, &erp_action->adapter->erp_ready_head);
3468 }
3469
3470 /*
3471  * function:    zfcp_erp_port_access_denied
3472  *
3473  * purpose:
3474  */
3475 void
3476 zfcp_erp_port_access_denied(struct zfcp_port *port)
3477 {
3478         struct zfcp_adapter *adapter = port->adapter;
3479         unsigned long flags;
3480
3481         debug_text_event(adapter->erp_dbf, 3, "p_access_block");
3482         debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof(wwn_t));
3483         read_lock_irqsave(&zfcp_data.config_lock, flags);
3484         zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED |
3485                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
3486         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
3487 }
3488
3489 /*
3490  * function:    zfcp_erp_unit_access_denied
3491  *
3492  * purpose:
3493  */
3494 void
3495 zfcp_erp_unit_access_denied(struct zfcp_unit *unit)
3496 {
3497         struct zfcp_adapter *adapter = unit->port->adapter;
3498
3499         debug_text_event(adapter->erp_dbf, 3, "u_access_block");
3500         debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof(fcp_lun_t));
3501         zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_ERP_FAILED |
3502                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
3503 }
3504
3505 /*
3506  * function:    zfcp_erp_adapter_access_changed
3507  *
3508  * purpose:
3509  */
3510 void
3511 zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter)
3512 {
3513         struct zfcp_port *port;
3514         unsigned long flags;
3515
3516         debug_text_event(adapter->erp_dbf, 3, "a_access_unblock");
3517         debug_event(adapter->erp_dbf, 3, &adapter->name, 8);
3518
3519         zfcp_erp_port_access_changed(adapter->nameserver_port);
3520         read_lock_irqsave(&zfcp_data.config_lock, flags);
3521         list_for_each_entry(port, &adapter->port_list_head, list)
3522                 if (port != adapter->nameserver_port)
3523                         zfcp_erp_port_access_changed(port);
3524         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
3525 }
3526
3527 /*
3528  * function:    zfcp_erp_port_access_changed
3529  *
3530  * purpose:
3531  */
3532 void
3533 zfcp_erp_port_access_changed(struct zfcp_port *port)
3534 {
3535         struct zfcp_adapter *adapter = port->adapter;
3536         struct zfcp_unit *unit;
3537
3538         debug_text_event(adapter->erp_dbf, 3, "p_access_unblock");
3539         debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof(wwn_t));
3540
3541         if (!atomic_test_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED,
3542                               &port->status)) {
3543                 if (!atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
3544                         list_for_each_entry(unit, &port->unit_list_head, list)
3545                                 zfcp_erp_unit_access_changed(unit);
3546                 return;
3547         }
3548
3549         ZFCP_LOG_NORMAL("reopen of port 0x%016Lx on adapter %s "
3550                         "(due to ACT update)\n",
3551                         port->wwpn, zfcp_get_busid_by_adapter(adapter));
3552         if (zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
3553                 ZFCP_LOG_NORMAL("failed reopen of port"
3554                                 "(adapter %s, wwpn=0x%016Lx)\n",
3555                                 zfcp_get_busid_by_adapter(adapter), port->wwpn);
3556 }
3557
3558 /*
3559  * function:    zfcp_erp_unit_access_changed
3560  *
3561  * purpose:
3562  */
3563 void
3564 zfcp_erp_unit_access_changed(struct zfcp_unit *unit)
3565 {
3566         struct zfcp_adapter *adapter = unit->port->adapter;
3567
3568         debug_text_event(adapter->erp_dbf, 3, "u_access_unblock");
3569         debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof(fcp_lun_t));
3570
3571         if (!atomic_test_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status))
3572                 return;
3573
3574         ZFCP_LOG_NORMAL("reopen of unit 0x%016Lx on port 0x%016Lx "
3575                         " on adapter %s (due to ACT update)\n",
3576                         unit->fcp_lun, unit->port->wwpn,
3577                         zfcp_get_busid_by_adapter(adapter));
3578         if (zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
3579                 ZFCP_LOG_NORMAL("failed reopen of unit (adapter %s, "
3580                                 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3581                                 zfcp_get_busid_by_adapter(adapter),
3582                                 unit->port->wwpn, unit->fcp_lun);
3583 }
3584
3585 #undef ZFCP_LOG_AREA