drivers/scsi/ibmvscsi/ibmvfc.c

   1 /*
   2  * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
   3  *
   4  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
   5  *
   6  * Copyright (C) IBM Corporation, 2008
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/dmapool.h>
  28 #include <linux/delay.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/kthread.h>
  31 #include <linux/of.h>
  32 #include <linux/stringify.h>
  33 #include <asm/firmware.h>
  34 #include <asm/irq.h>
  35 #include <asm/vio.h>
  36 #include <scsi/scsi.h>
  37 #include <scsi/scsi_cmnd.h>
  38 #include <scsi/scsi_host.h>
  39 #include <scsi/scsi_device.h>
  40 #include <scsi/scsi_tcq.h>
  41 #include <scsi/scsi_transport_fc.h>
  42 #include "ibmvfc.h"
  43
  44 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  45 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  46 static unsigned int max_lun = IBMVFC_MAX_LUN;
  47 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  48 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  49 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  50 static unsigned int dev_loss_tmo = IBMVFC_DEV_LOSS_TMO;
  51 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  52 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  53 static LIST_HEAD(ibmvfc_head);
  54 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  55 static struct scsi_transport_template *ibmvfc_transport_template;
  56
  57 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  58 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  59 MODULE_LICENSE("GPL");
  60 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  61
  62 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  63 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  64                  "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  65 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  66 MODULE_PARM_DESC(default_timeout,
  67                  "Default timeout in seconds for initialization and EH commands. "
  68                  "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  69 module_param_named(max_requests, max_requests, uint, S_IRUGO);
  70 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  71                  "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  72 module_param_named(max_lun, max_lun, uint, S_IRUGO);
  73 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  74                  "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  75 module_param_named(max_targets, max_targets, uint, S_IRUGO);
  76 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  77                  "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  78 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
  79 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
  80                  "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
  81 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
  82 MODULE_PARM_DESC(debug, "Enable driver debug information. "
  83                  "[Default=" __stringify(IBMVFC_DEBUG) "]");
  84 module_param_named(dev_loss_tmo, dev_loss_tmo, uint, S_IRUGO | S_IWUSR);
  85 MODULE_PARM_DESC(dev_loss_tmo, "Maximum number of seconds that the FC "
  86                  "transport should insulate the loss of a remote port. Once this "
  87                  "value is exceeded, the scsi target is removed. "
  88                  "[Default=" __stringify(IBMVFC_DEV_LOSS_TMO) "]");
  89 module_param_named(log_level, log_level, uint, 0);
  90 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
  91                  "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
  92
  93 static const struct {
  94         u16 status;
  95         u16 error;
  96         u8 result;
  97         u8 retry;
  98         int log;
  99         char *name;
 100 } cmd_status [] = {
 101         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
 102         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
 103         { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
 104         { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
 105         { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
 106         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
 107         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
 108         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
 109         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
 110         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
 111         { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 112         { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 113         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 114         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 115
 116         { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 117         { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 118         { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 119         { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 120         { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 121         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 122         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 123         { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 124         { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 125         { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 126
 127         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 128         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 129         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 130         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 131         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 132         { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 133         { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 134         { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 135         { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 136         { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 137         { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 138
 139         { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 140 };
 141
 142 static void ibmvfc_npiv_login(struct ibmvfc_host *);
 143 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 144 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 145 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 146 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 147
 148 static const char *unknown_error = "unknown error";
 149
 150 #ifdef CONFIG_SCSI_IBMVFC_TRACE
 151 /**
 152  * ibmvfc_trc_start - Log a start trace entry
 153  * @evt:                ibmvfc event struct
 154  *
 155  **/
 156 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 157 {
 158         struct ibmvfc_host *vhost = evt->vhost;
 159         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 160         struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 161         struct ibmvfc_trace_entry *entry;
 162
 163         entry = &vhost->trace[vhost->trace_index++];
 164         entry->evt = evt;
 165         entry->time = jiffies;
 166         entry->fmt = evt->crq.format;
 167         entry->type = IBMVFC_TRC_START;
 168
 169         switch (entry->fmt) {
 170         case IBMVFC_CMD_FORMAT:
 171                 entry->op_code = vfc_cmd->iu.cdb[0];
 172                 entry->scsi_id = vfc_cmd->tgt_scsi_id;
 173                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 174                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 175                 entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
 176                 break;
 177         case IBMVFC_MAD_FORMAT:
 178                 entry->op_code = mad->opcode;
 179                 break;
 180         default:
 181                 break;
 182         };
 183 }
 184
 185 /**
 186  * ibmvfc_trc_end - Log an end trace entry
 187  * @evt:                ibmvfc event struct
 188  *
 189  **/
 190 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 191 {
 192         struct ibmvfc_host *vhost = evt->vhost;
 193         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 194         struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 195         struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
 196
 197         entry->evt = evt;
 198         entry->time = jiffies;
 199         entry->fmt = evt->crq.format;
 200         entry->type = IBMVFC_TRC_END;
 201
 202         switch (entry->fmt) {
 203         case IBMVFC_CMD_FORMAT:
 204                 entry->op_code = vfc_cmd->iu.cdb[0];
 205                 entry->scsi_id = vfc_cmd->tgt_scsi_id;
 206                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 207                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 208                 entry->u.end.status = vfc_cmd->status;
 209                 entry->u.end.error = vfc_cmd->error;
 210                 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
 211                 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
 212                 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
 213                 break;
 214         case IBMVFC_MAD_FORMAT:
 215                 entry->op_code = mad->opcode;
 216                 entry->u.end.status = mad->status;
 217                 break;
 218         default:
 219                 break;
 220
 221         };
 222 }
 223
 224 #else
 225 #define ibmvfc_trc_start(evt) do { } while (0)
 226 #define ibmvfc_trc_end(evt) do { } while (0)
 227 #endif
 228
 229 /**
 230  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 231  * @status:             status / error class
 232  * @error:              error
 233  *
 234  * Return value:
 235  *      index into cmd_status / -EINVAL on failure
 236  **/
 237 static int ibmvfc_get_err_index(u16 status, u16 error)
 238 {
 239         int i;
 240
 241         for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 242                 if ((cmd_status[i].status & status) == cmd_status[i].status &&
 243                     cmd_status[i].error == error)
 244                         return i;
 245
 246         return -EINVAL;
 247 }
 248
 249 /**
 250  * ibmvfc_get_cmd_error - Find the error description for the fcp response
 251  * @status:             status / error class
 252  * @error:              error
 253  *
 254  * Return value:
 255  *      error description string
 256  **/
 257 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 258 {
 259         int rc = ibmvfc_get_err_index(status, error);
 260         if (rc >= 0)
 261                 return cmd_status[rc].name;
 262         return unknown_error;
 263 }
 264
 265 /**
 266  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 267  * @vfc_cmd:    ibmvfc command struct
 268  *
 269  * Return value:
 270  *      SCSI result value to return for completed command
 271  **/
 272 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
 273 {
 274         int err;
 275         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
 276         int fc_rsp_len = rsp->fcp_rsp_len;
 277
 278         if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 279             ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 280              rsp->data.info.rsp_code))
 281                 return DID_ERROR << 16;
 282
 283         err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
 284         if (err >= 0)
 285                 return rsp->scsi_status | (cmd_status[err].result << 16);
 286         return rsp->scsi_status | (DID_ERROR << 16);
 287 }
 288
 289 /**
 290  * ibmvfc_retry_cmd - Determine if error status is retryable
 291  * @status:             status / error class
 292  * @error:              error
 293  *
 294  * Return value:
 295  *      1 if error should be retried / 0 if it should not
 296  **/
 297 static int ibmvfc_retry_cmd(u16 status, u16 error)
 298 {
 299         int rc = ibmvfc_get_err_index(status, error);
 300
 301         if (rc >= 0)
 302                 return cmd_status[rc].retry;
 303         return 1;
 304 }
 305
 306 static const char *unknown_fc_explain = "unknown fc explain";
 307
 308 static const struct {
 309         u16 fc_explain;
 310         char *name;
 311 } ls_explain [] = {
 312         { 0x00, "no additional explanation" },
 313         { 0x01, "service parameter error - options" },
 314         { 0x03, "service parameter error - initiator control" },
 315         { 0x05, "service parameter error - recipient control" },
 316         { 0x07, "service parameter error - received data field size" },
 317         { 0x09, "service parameter error - concurrent seq" },
 318         { 0x0B, "service parameter error - credit" },
 319         { 0x0D, "invalid N_Port/F_Port_Name" },
 320         { 0x0E, "invalid node/Fabric Name" },
 321         { 0x0F, "invalid common service parameters" },
 322         { 0x11, "invalid association header" },
 323         { 0x13, "association header required" },
 324         { 0x15, "invalid originator S_ID" },
 325         { 0x17, "invalid OX_ID-RX-ID combination" },
 326         { 0x19, "command (request) already in progress" },
 327         { 0x1E, "N_Port Login requested" },
 328         { 0x1F, "Invalid N_Port_ID" },
 329 };
 330
 331 static const struct {
 332         u16 fc_explain;
 333         char *name;
 334 } gs_explain [] = {
 335         { 0x00, "no additional explanation" },
 336         { 0x01, "port identifier not registered" },
 337         { 0x02, "port name not registered" },
 338         { 0x03, "node name not registered" },
 339         { 0x04, "class of service not registered" },
 340         { 0x06, "initial process associator not registered" },
 341         { 0x07, "FC-4 TYPEs not registered" },
 342         { 0x08, "symbolic port name not registered" },
 343         { 0x09, "symbolic node name not registered" },
 344         { 0x0A, "port type not registered" },
 345         { 0xF0, "authorization exception" },
 346         { 0xF1, "authentication exception" },
 347         { 0xF2, "data base full" },
 348         { 0xF3, "data base empty" },
 349         { 0xF4, "processing request" },
 350         { 0xF5, "unable to verify connection" },
 351         { 0xF6, "devices not in a common zone" },
 352 };
 353
 354 /**
 355  * ibmvfc_get_ls_explain - Return the FC Explain description text
 356  * @status:     FC Explain status
 357  *
 358  * Returns:
 359  *      error string
 360  **/
 361 static const char *ibmvfc_get_ls_explain(u16 status)
 362 {
 363         int i;
 364
 365         for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 366                 if (ls_explain[i].fc_explain == status)
 367                         return ls_explain[i].name;
 368
 369         return unknown_fc_explain;
 370 }
 371
 372 /**
 373  * ibmvfc_get_gs_explain - Return the FC Explain description text
 374  * @status:     FC Explain status
 375  *
 376  * Returns:
 377  *      error string
 378  **/
 379 static const char *ibmvfc_get_gs_explain(u16 status)
 380 {
 381         int i;
 382
 383         for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 384                 if (gs_explain[i].fc_explain == status)
 385                         return gs_explain[i].name;
 386
 387         return unknown_fc_explain;
 388 }
 389
 390 static const struct {
 391         enum ibmvfc_fc_type fc_type;
 392         char *name;
 393 } fc_type [] = {
 394         { IBMVFC_FABRIC_REJECT, "fabric reject" },
 395         { IBMVFC_PORT_REJECT, "port reject" },
 396         { IBMVFC_LS_REJECT, "ELS reject" },
 397         { IBMVFC_FABRIC_BUSY, "fabric busy" },
 398         { IBMVFC_PORT_BUSY, "port busy" },
 399         { IBMVFC_BASIC_REJECT, "basic reject" },
 400 };
 401
 402 static const char *unknown_fc_type = "unknown fc type";
 403
 404 /**
 405  * ibmvfc_get_fc_type - Return the FC Type description text
 406  * @status:     FC Type error status
 407  *
 408  * Returns:
 409  *      error string
 410  **/
 411 static const char *ibmvfc_get_fc_type(u16 status)
 412 {
 413         int i;
 414
 415         for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 416                 if (fc_type[i].fc_type == status)
 417                         return fc_type[i].name;
 418
 419         return unknown_fc_type;
 420 }
 421
 422 /**
 423  * ibmvfc_set_tgt_action - Set the next init action for the target
 424  * @tgt:                ibmvfc target struct
 425  * @action:             action to perform
 426  *
 427  **/
 428 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 429                                   enum ibmvfc_target_action action)
 430 {
 431         switch (tgt->action) {
 432         case IBMVFC_TGT_ACTION_DEL_RPORT:
 433                 break;
 434         default:
 435                 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
 436                         tgt->add_rport = 0;
 437                 tgt->action = action;
 438                 break;
 439         }
 440 }
 441
 442 /**
 443  * ibmvfc_set_host_state - Set the state for the host
 444  * @vhost:              ibmvfc host struct
 445  * @state:              state to set host to
 446  *
 447  * Returns:
 448  *      0 if state changed / non-zero if not changed
 449  **/
 450 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
 451                                   enum ibmvfc_host_state state)
 452 {
 453         int rc = 0;
 454
 455         switch (vhost->state) {
 456         case IBMVFC_HOST_OFFLINE:
 457                 rc = -EINVAL;
 458                 break;
 459         default:
 460                 vhost->state = state;
 461                 break;
 462         };
 463
 464         return rc;
 465 }
 466
 467 /**
 468  * ibmvfc_set_host_action - Set the next init action for the host
 469  * @vhost:              ibmvfc host struct
 470  * @action:             action to perform
 471  *
 472  **/
 473 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 474                                    enum ibmvfc_host_action action)
 475 {
 476         switch (action) {
 477         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 478                 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
 479                         vhost->action = action;
 480                 break;
 481         case IBMVFC_HOST_ACTION_LOGO_WAIT:
 482                 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
 483                         vhost->action = action;
 484                 break;
 485         case IBMVFC_HOST_ACTION_INIT_WAIT:
 486                 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
 487                         vhost->action = action;
 488                 break;
 489         case IBMVFC_HOST_ACTION_QUERY:
 490                 switch (vhost->action) {
 491                 case IBMVFC_HOST_ACTION_INIT_WAIT:
 492                 case IBMVFC_HOST_ACTION_NONE:
 493                 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 494                         vhost->action = action;
 495                         break;
 496                 default:
 497                         break;
 498                 };
 499                 break;
 500         case IBMVFC_HOST_ACTION_TGT_INIT:
 501                 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 502                         vhost->action = action;
 503                 break;
 504         case IBMVFC_HOST_ACTION_LOGO:
 505         case IBMVFC_HOST_ACTION_INIT:
 506         case IBMVFC_HOST_ACTION_TGT_DEL:
 507         case IBMVFC_HOST_ACTION_QUERY_TGTS:
 508         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 509         case IBMVFC_HOST_ACTION_NONE:
 510         default:
 511                 vhost->action = action;
 512                 break;
 513         };
 514 }
 515
 516 /**
 517  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 518  * @vhost:              ibmvfc host struct
 519  *
 520  * Return value:
 521  *      nothing
 522  **/
 523 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 524 {
 525         if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
 526                 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 527                         scsi_block_requests(vhost->host);
 528                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 529                 }
 530         } else
 531                 vhost->reinit = 1;
 532
 533         wake_up(&vhost->work_wait_q);
 534 }
 535
 536 /**
 537  * ibmvfc_link_down - Handle a link down event from the adapter
 538  * @vhost:      ibmvfc host struct
 539  * @state:      ibmvfc host state to enter
 540  *
 541  **/
 542 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 543                              enum ibmvfc_host_state state)
 544 {
 545         struct ibmvfc_target *tgt;
 546
 547         ENTER;
 548         scsi_block_requests(vhost->host);
 549         list_for_each_entry(tgt, &vhost->targets, queue)
 550                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 551         ibmvfc_set_host_state(vhost, state);
 552         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 553         vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 554         wake_up(&vhost->work_wait_q);
 555         LEAVE;
 556 }
 557
 558 /**
 559  * ibmvfc_init_host - Start host initialization
 560  * @vhost:              ibmvfc host struct
 561  * @relogin:    is this a re-login?
 562  *
 563  * Return value:
 564  *      nothing
 565  **/
 566 static void ibmvfc_init_host(struct ibmvfc_host *vhost, int relogin)
 567 {
 568         struct ibmvfc_target *tgt;
 569
 570         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 571                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 572                         dev_err(vhost->dev,
 573                                 "Host initialization retries exceeded. Taking adapter offline\n");
 574                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 575                         return;
 576                 }
 577         }
 578
 579         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 580                 if (!relogin) {
 581                         memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
 582                         vhost->async_crq.cur = 0;
 583                 }
 584
 585                 list_for_each_entry(tgt, &vhost->targets, queue)
 586                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 587                 scsi_block_requests(vhost->host);
 588                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 589                 vhost->job_step = ibmvfc_npiv_login;
 590                 wake_up(&vhost->work_wait_q);
 591         }
 592 }
 593
 594 /**
 595  * ibmvfc_send_crq - Send a CRQ
 596  * @vhost:      ibmvfc host struct
 597  * @word1:      the first 64 bits of the data
 598  * @word2:      the second 64 bits of the data
 599  *
 600  * Return value:
 601  *      0 on success / other on failure
 602  **/
 603 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 604 {
 605         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 606         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 607 }
 608
 609 /**
 610  * ibmvfc_send_crq_init - Send a CRQ init message
 611  * @vhost:      ibmvfc host struct
 612  *
 613  * Return value:
 614  *      0 on success / other on failure
 615  **/
 616 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
 617 {
 618         ibmvfc_dbg(vhost, "Sending CRQ init\n");
 619         return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 620 }
 621
 622 /**
 623  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 624  * @vhost:      ibmvfc host struct
 625  *
 626  * Return value:
 627  *      0 on success / other on failure
 628  **/
 629 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 630 {
 631         ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 632         return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 633 }
 634
 635 /**
 636  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 637  * @vhost:      ibmvfc host struct
 638  *
 639  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 640  * the crq with the hypervisor.
 641  **/
 642 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 643 {
 644         long rc;
 645         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 646         struct ibmvfc_crq_queue *crq = &vhost->crq;
 647
 648         ibmvfc_dbg(vhost, "Releasing CRQ\n");
 649         free_irq(vdev->irq, vhost);
 650         tasklet_kill(&vhost->tasklet);
 651         do {
 652                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 653         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 654
 655         vhost->state = IBMVFC_NO_CRQ;
 656         vhost->logged_in = 0;
 657         dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 658         free_page((unsigned long)crq->msgs);
 659 }
 660
 661 /**
 662  * ibmvfc_reenable_crq_queue - reenables the CRQ
 663  * @vhost:      ibmvfc host struct
 664  *
 665  * Return value:
 666  *      0 on success / other on failure
 667  **/
 668 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 669 {
 670         int rc;
 671         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 672
 673         /* Re-enable the CRQ */
 674         do {
 675                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 676         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 677
 678         if (rc)
 679                 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 680
 681         return rc;
 682 }
 683
 684 /**
 685  * ibmvfc_reset_crq - resets a crq after a failure
 686  * @vhost:      ibmvfc host struct
 687  *
 688  * Return value:
 689  *      0 on success / other on failure
 690  **/
 691 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 692 {
 693         int rc;
 694         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 695         struct ibmvfc_crq_queue *crq = &vhost->crq;
 696
 697         /* Close the CRQ */
 698         do {
 699                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 700         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 701
 702         vhost->state = IBMVFC_NO_CRQ;
 703         vhost->logged_in = 0;
 704         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
 705
 706         /* Clean out the queue */
 707         memset(crq->msgs, 0, PAGE_SIZE);
 708         crq->cur = 0;
 709
 710         /* And re-open it again */
 711         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 712                                 crq->msg_token, PAGE_SIZE);
 713
 714         if (rc == H_CLOSED)
 715                 /* Adapter is good, but other end is not ready */
 716                 dev_warn(vhost->dev, "Partner adapter not ready\n");
 717         else if (rc != 0)
 718                 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 719
 720         return rc;
 721 }
 722
 723 /**
 724  * ibmvfc_valid_event - Determines if event is valid.
 725  * @pool:       event_pool that contains the event
 726  * @evt:        ibmvfc event to be checked for validity
 727  *
 728  * Return value:
 729  *      1 if event is valid / 0 if event is not valid
 730  **/
 731 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
 732                               struct ibmvfc_event *evt)
 733 {
 734         int index = evt - pool->events;
 735         if (index < 0 || index >= pool->size)   /* outside of bounds */
 736                 return 0;
 737         if (evt != pool->events + index)        /* unaligned */
 738                 return 0;
 739         return 1;
 740 }
 741
 742 /**
 743  * ibmvfc_free_event - Free the specified event
 744  * @evt:        ibmvfc_event to be freed
 745  *
 746  **/
 747 static void ibmvfc_free_event(struct ibmvfc_event *evt)
 748 {
 749         struct ibmvfc_host *vhost = evt->vhost;
 750         struct ibmvfc_event_pool *pool = &vhost->pool;
 751
 752         BUG_ON(!ibmvfc_valid_event(pool, evt));
 753         BUG_ON(atomic_inc_return(&evt->free) != 1);
 754         list_add_tail(&evt->queue, &vhost->free);
 755 }
 756
 757 /**
 758  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
 759  * @evt:        ibmvfc event struct
 760  *
 761  * This function does not setup any error status, that must be done
 762  * before this function gets called.
 763  **/
 764 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
 765 {
 766         struct scsi_cmnd *cmnd = evt->cmnd;
 767
 768         if (cmnd) {
 769                 scsi_dma_unmap(cmnd);
 770                 cmnd->scsi_done(cmnd);
 771         }
 772
 773         if (evt->eh_comp)
 774                 complete(evt->eh_comp);
 775
 776         ibmvfc_free_event(evt);
 777 }
 778
 779 /**
 780  * ibmvfc_fail_request - Fail request with specified error code
 781  * @evt:                ibmvfc event struct
 782  * @error_code: error code to fail request with
 783  *
 784  * Return value:
 785  *      none
 786  **/
 787 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
 788 {
 789         if (evt->cmnd) {
 790                 evt->cmnd->result = (error_code << 16);
 791                 evt->done = ibmvfc_scsi_eh_done;
 792         } else
 793                 evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;
 794
 795         list_del(&evt->queue);
 796         del_timer(&evt->timer);
 797         ibmvfc_trc_end(evt);
 798         evt->done(evt);
 799 }
 800
 801 /**
 802  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
 803  * @vhost:              ibmvfc host struct
 804  * @error_code: error code to fail requests with
 805  *
 806  * Return value:
 807  *      none
 808  **/
 809 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
 810 {
 811         struct ibmvfc_event *evt, *pos;
 812
 813         ibmvfc_dbg(vhost, "Purging all requests\n");
 814         list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
 815                 ibmvfc_fail_request(evt, error_code);
 816 }
 817
 818 /**
 819  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
 820  * @vhost:      struct ibmvfc host to reset
 821  **/
 822 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
 823 {
 824         int rc;
 825
 826         scsi_block_requests(vhost->host);
 827         ibmvfc_purge_requests(vhost, DID_ERROR);
 828         if ((rc = ibmvfc_reset_crq(vhost)) ||
 829             (rc = ibmvfc_send_crq_init(vhost)) ||
 830             (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
 831                 dev_err(vhost->dev, "Error after reset rc=%d\n", rc);
 832                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
 833         } else
 834                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
 835 }
 836
 837 /**
 838  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
 839  * @vhost:      struct ibmvfc host to reset
 840  **/
 841 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
 842 {
 843         if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
 844             !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 845                 scsi_block_requests(vhost->host);
 846                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
 847                 vhost->job_step = ibmvfc_npiv_logout;
 848                 wake_up(&vhost->work_wait_q);
 849         } else
 850                 ibmvfc_hard_reset_host(vhost);
 851 }
 852
 853 /**
 854  * ibmvfc_reset_host - Reset the connection to the server
 855  * @vhost:      ibmvfc host struct
 856  **/
 857 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
 858 {
 859         unsigned long flags;
 860
 861         spin_lock_irqsave(vhost->host->host_lock, flags);
 862         __ibmvfc_reset_host(vhost);
 863         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 864 }
 865
 866 /**
 867  * ibmvfc_retry_host_init - Retry host initialization if allowed
 868  * @vhost:      ibmvfc host struct
 869  *
 870  * Returns: 1 if init will be retried / 0 if not
 871  *
 872  **/
 873 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
 874 {
 875         int retry = 0;
 876
 877         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 878                 vhost->delay_init = 1;
 879                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 880                         dev_err(vhost->dev,
 881                                 "Host initialization retries exceeded. Taking adapter offline\n");
 882                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 883                 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
 884                         __ibmvfc_reset_host(vhost);
 885                 else {
 886                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 887                         retry = 1;
 888                 }
 889         }
 890
 891         wake_up(&vhost->work_wait_q);
 892         return retry;
 893 }
 894
 895 /**
 896  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
 897  * @starget:    scsi target struct
 898  *
 899  * Return value:
 900  *      ibmvfc_target struct / NULL if not found
 901  **/
 902 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
 903 {
 904         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 905         struct ibmvfc_host *vhost = shost_priv(shost);
 906         struct ibmvfc_target *tgt;
 907
 908         list_for_each_entry(tgt, &vhost->targets, queue)
 909                 if (tgt->target_id == starget->id) {
 910                         kref_get(&tgt->kref);
 911                         return tgt;
 912                 }
 913         return NULL;
 914 }
 915
 916 /**
 917  * ibmvfc_get_target - Find the specified scsi_target
 918  * @starget:    scsi target struct
 919  *
 920  * Return value:
 921  *      ibmvfc_target struct / NULL if not found
 922  **/
 923 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
 924 {
 925         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 926         struct ibmvfc_target *tgt;
 927         unsigned long flags;
 928
 929         spin_lock_irqsave(shost->host_lock, flags);
 930         tgt = __ibmvfc_get_target(starget);
 931         spin_unlock_irqrestore(shost->host_lock, flags);
 932         return tgt;
 933 }
 934
 935 /**
 936  * ibmvfc_get_host_speed - Get host port speed
 937  * @shost:              scsi host struct
 938  *
 939  * Return value:
 940  *      none
 941  **/
 942 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
 943 {
 944         struct ibmvfc_host *vhost = shost_priv(shost);
 945         unsigned long flags;
 946
 947         spin_lock_irqsave(shost->host_lock, flags);
 948         if (vhost->state == IBMVFC_ACTIVE) {
 949                 switch (vhost->login_buf->resp.link_speed / 100) {
 950                 case 1:
 951                         fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
 952                         break;
 953                 case 2:
 954                         fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
 955                         break;
 956                 case 4:
 957                         fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
 958                         break;
 959                 case 8:
 960                         fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
 961                         break;
 962                 case 10:
 963                         fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
 964                         break;
 965                 case 16:
 966                         fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
 967                         break;
 968                 default:
 969                         ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
 970                                    vhost->login_buf->resp.link_speed / 100);
 971                         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 972                         break;
 973                 }
 974         } else
 975                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 976         spin_unlock_irqrestore(shost->host_lock, flags);
 977 }
 978
 979 /**
 980  * ibmvfc_get_host_port_state - Get host port state
 981  * @shost:              scsi host struct
 982  *
 983  * Return value:
 984  *      none
 985  **/
 986 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
 987 {
 988         struct ibmvfc_host *vhost = shost_priv(shost);
 989         unsigned long flags;
 990
 991         spin_lock_irqsave(shost->host_lock, flags);
 992         switch (vhost->state) {
 993         case IBMVFC_INITIALIZING:
 994         case IBMVFC_ACTIVE:
 995                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 996                 break;
 997         case IBMVFC_LINK_DOWN:
 998                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 999                 break;
1000         case IBMVFC_LINK_DEAD:
1001         case IBMVFC_HOST_OFFLINE:
1002                 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1003                 break;
1004         case IBMVFC_HALTED:
1005                 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1006                 break;
1007         case IBMVFC_NO_CRQ:
1008                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1009                 break;
1010         default:
1011                 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1012                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1013                 break;
1014         }
1015         spin_unlock_irqrestore(shost->host_lock, flags);
1016 }
1017
1018 /**
1019  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1020  * @rport:              rport struct
1021  * @timeout:    timeout value
1022  *
1023  * Return value:
1024  *      none
1025  **/
1026 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1027 {
1028         if (timeout)
1029                 rport->dev_loss_tmo = timeout;
1030         else
1031                 rport->dev_loss_tmo = 1;
1032 }
1033
1034 /**
1035  * ibmvfc_release_tgt - Free memory allocated for a target
1036  * @kref:               kref struct
1037  *
1038  **/
1039 static void ibmvfc_release_tgt(struct kref *kref)
1040 {
1041         struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1042         kfree(tgt);
1043 }
1044
1045 /**
1046  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1047  * @starget:    scsi target struct
1048  *
1049  * Return value:
1050  *      none
1051  **/
1052 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1053 {
1054         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1055         fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1056         if (tgt)
1057                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1058 }
1059
1060 /**
1061  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1062  * @starget:    scsi target struct
1063  *
1064  * Return value:
1065  *      none
1066  **/
1067 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1068 {
1069         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1070         fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1071         if (tgt)
1072                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1073 }
1074
1075 /**
1076  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1077  * @starget:    scsi target struct
1078  *
1079  * Return value:
1080  *      none
1081  **/
1082 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1083 {
1084         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1085         fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1086         if (tgt)
1087                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1088 }
1089
1090 /**
1091  * ibmvfc_wait_while_resetting - Wait while the host resets
1092  * @vhost:              ibmvfc host struct
1093  *
1094  * Return value:
1095  *      0 on success / other on failure
1096  **/
1097 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1098 {
1099         long timeout = wait_event_timeout(vhost->init_wait_q,
1100                                           ((vhost->state == IBMVFC_ACTIVE ||
1101                                             vhost->state == IBMVFC_HOST_OFFLINE ||
1102                                             vhost->state == IBMVFC_LINK_DEAD) &&
1103                                            vhost->action == IBMVFC_HOST_ACTION_NONE),
1104                                           (init_timeout * HZ));
1105
1106         return timeout ? 0 : -EIO;
1107 }
1108
1109 /**
1110  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1111  * @shost:              scsi host struct
1112  *
1113  * Return value:
1114  *      0 on success / other on failure
1115  **/
1116 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1117 {
1118         struct ibmvfc_host *vhost = shost_priv(shost);
1119
1120         dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1121         ibmvfc_reset_host(vhost);
1122         return ibmvfc_wait_while_resetting(vhost);
1123 }
1124
1125 /**
1126  * ibmvfc_gather_partition_info - Gather info about the LPAR
1127  *
1128  * Return value:
1129  *      none
1130  **/
1131 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1132 {
1133         struct device_node *rootdn;
1134         const char *name;
1135         const unsigned int *num;
1136
1137         rootdn = of_find_node_by_path("/");
1138         if (!rootdn)
1139                 return;
1140
1141         name = of_get_property(rootdn, "ibm,partition-name", NULL);
1142         if (name)
1143                 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1144         num = of_get_property(rootdn, "ibm,partition-no", NULL);
1145         if (num)
1146                 vhost->partition_number = *num;
1147         of_node_put(rootdn);
1148 }
1149
1150 /**
1151  * ibmvfc_set_login_info - Setup info for NPIV login
1152  * @vhost:      ibmvfc host struct
1153  *
1154  * Return value:
1155  *      none
1156  **/
1157 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1158 {
1159         struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1160         struct device_node *of_node = vhost->dev->archdata.of_node;
1161         const char *location;
1162
1163         memset(login_info, 0, sizeof(*login_info));
1164
1165         login_info->ostype = IBMVFC_OS_LINUX;
1166         login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
1167         login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
1168         login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
1169         login_info->partition_num = vhost->partition_number;
1170         login_info->vfc_frame_version = 1;
1171         login_info->fcp_version = 3;
1172         login_info->flags = IBMVFC_FLUSH_ON_HALT;
1173         if (vhost->client_migrated)
1174                 login_info->flags |= IBMVFC_CLIENT_MIGRATED;
1175
1176         login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1177         login_info->capabilities = IBMVFC_CAN_MIGRATE;
1178         login_info->async.va = vhost->async_crq.msg_token;
1179         login_info->async.len = vhost->async_crq.size * sizeof(*vhost->async_crq.msgs);
1180         strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1181         strncpy(login_info->device_name,
1182                 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1183
1184         location = of_get_property(of_node, "ibm,loc-code", NULL);
1185         location = location ? location : dev_name(vhost->dev);
1186         strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1187 }
1188
1189 /**
1190  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1191  * @vhost:      ibmvfc host who owns the event pool
1192  *
1193  * Returns zero on success.
1194  **/
1195 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1196 {
1197         int i;
1198         struct ibmvfc_event_pool *pool = &vhost->pool;
1199
1200         ENTER;
1201         pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1202         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1203         if (!pool->events)
1204                 return -ENOMEM;
1205
1206         pool->iu_storage = dma_alloc_coherent(vhost->dev,
1207                                               pool->size * sizeof(*pool->iu_storage),
1208                                               &pool->iu_token, 0);
1209
1210         if (!pool->iu_storage) {
1211                 kfree(pool->events);
1212                 return -ENOMEM;
1213         }
1214
1215         for (i = 0; i < pool->size; ++i) {
1216                 struct ibmvfc_event *evt = &pool->events[i];
1217                 atomic_set(&evt->free, 1);
1218                 evt->crq.valid = 0x80;
1219                 evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
1220                 evt->xfer_iu = pool->iu_storage + i;
1221                 evt->vhost = vhost;
1222                 evt->ext_list = NULL;
1223                 list_add_tail(&evt->queue, &vhost->free);
1224         }
1225
1226         LEAVE;
1227         return 0;
1228 }
1229
1230 /**
1231  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1232  * @vhost:      ibmvfc host who owns the event pool
1233  *
1234  **/
1235 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1236 {
1237         int i;
1238         struct ibmvfc_event_pool *pool = &vhost->pool;
1239
1240         ENTER;
1241         for (i = 0; i < pool->size; ++i) {
1242                 list_del(&pool->events[i].queue);
1243                 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1244                 if (pool->events[i].ext_list)
1245                         dma_pool_free(vhost->sg_pool,
1246                                       pool->events[i].ext_list,
1247                                       pool->events[i].ext_list_token);
1248         }
1249
1250         kfree(pool->events);
1251         dma_free_coherent(vhost->dev,
1252                           pool->size * sizeof(*pool->iu_storage),
1253                           pool->iu_storage, pool->iu_token);
1254         LEAVE;
1255 }
1256
1257 /**
1258  * ibmvfc_get_event - Gets the next free event in pool
1259  * @vhost:      ibmvfc host struct
1260  *
1261  * Returns a free event from the pool.
1262  **/
1263 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1264 {
1265         struct ibmvfc_event *evt;
1266
1267         BUG_ON(list_empty(&vhost->free));
1268         evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1269         atomic_set(&evt->free, 0);
1270         list_del(&evt->queue);
1271         return evt;
1272 }
1273
1274 /**
1275  * ibmvfc_init_event - Initialize fields in an event struct that are always
1276  *                              required.
1277  * @evt:        The event
1278  * @done:       Routine to call when the event is responded to
1279  * @format:     SRP or MAD format
1280  **/
1281 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1282                               void (*done) (struct ibmvfc_event *), u8 format)
1283 {
1284         evt->cmnd = NULL;
1285         evt->sync_iu = NULL;
1286         evt->crq.format = format;
1287         evt->done = done;
1288         evt->eh_comp = NULL;
1289 }
1290
1291 /**
1292  * ibmvfc_map_sg_list - Initialize scatterlist
1293  * @scmd:       scsi command struct
1294  * @nseg:       number of scatterlist segments
1295  * @md: memory descriptor list to initialize
1296  **/
1297 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1298                                struct srp_direct_buf *md)
1299 {
1300         int i;
1301         struct scatterlist *sg;
1302
1303         scsi_for_each_sg(scmd, sg, nseg, i) {
1304                 md[i].va = sg_dma_address(sg);
1305                 md[i].len = sg_dma_len(sg);
1306                 md[i].key = 0;
1307         }
1308 }
1309
1310 /**
1311  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1312  * @scmd:               Scsi_Cmnd with the scatterlist
1313  * @evt:                ibmvfc event struct
1314  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1315  * @dev:                device for which to map dma memory
1316  *
1317  * Returns:
1318  *      0 on success / non-zero on failure
1319  **/
1320 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1321                               struct ibmvfc_event *evt,
1322                               struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1323 {
1324
1325         int sg_mapped;
1326         struct srp_direct_buf *data = &vfc_cmd->ioba;
1327         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1328
1329         sg_mapped = scsi_dma_map(scmd);
1330         if (!sg_mapped) {
1331                 vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
1332                 return 0;
1333         } else if (unlikely(sg_mapped < 0)) {
1334                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1335                         scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1336                 return sg_mapped;
1337         }
1338
1339         if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1340                 vfc_cmd->flags |= IBMVFC_WRITE;
1341                 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1342         } else {
1343                 vfc_cmd->flags |= IBMVFC_READ;
1344                 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1345         }
1346
1347         if (sg_mapped == 1) {
1348                 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1349                 return 0;
1350         }
1351
1352         vfc_cmd->flags |= IBMVFC_SCATTERLIST;
1353
1354         if (!evt->ext_list) {
1355                 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1356                                                &evt->ext_list_token);
1357
1358                 if (!evt->ext_list) {
1359                         scsi_dma_unmap(scmd);
1360                         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1361                                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1362                         return -ENOMEM;
1363                 }
1364         }
1365
1366         ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1367
1368         data->va = evt->ext_list_token;
1369         data->len = sg_mapped * sizeof(struct srp_direct_buf);
1370         data->key = 0;
1371         return 0;
1372 }
1373
1374 /**
1375  * ibmvfc_timeout - Internal command timeout handler
1376  * @evt:        struct ibmvfc_event that timed out
1377  *
1378  * Called when an internally generated command times out
1379  **/
1380 static void ibmvfc_timeout(struct ibmvfc_event *evt)
1381 {
1382         struct ibmvfc_host *vhost = evt->vhost;
1383         dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1384         ibmvfc_reset_host(vhost);
1385 }
1386
1387 /**
1388  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1389  * @evt:                event to be sent
1390  * @vhost:              ibmvfc host struct
1391  * @timeout:    timeout in seconds - 0 means do not time command
1392  *
1393  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1394  **/
1395 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1396                              struct ibmvfc_host *vhost, unsigned long timeout)
1397 {
1398         u64 *crq_as_u64 = (u64 *) &evt->crq;
1399         int rc;
1400
1401         /* Copy the IU into the transfer area */
1402         *evt->xfer_iu = evt->iu;
1403         if (evt->crq.format == IBMVFC_CMD_FORMAT)
1404                 evt->xfer_iu->cmd.tag = (u64)evt;
1405         else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1406                 evt->xfer_iu->mad_common.tag = (u64)evt;
1407         else
1408                 BUG();
1409
1410         list_add_tail(&evt->queue, &vhost->sent);
1411         init_timer(&evt->timer);
1412
1413         if (timeout) {
1414                 evt->timer.data = (unsigned long) evt;
1415                 evt->timer.expires = jiffies + (timeout * HZ);
1416                 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1417                 add_timer(&evt->timer);
1418         }
1419
1420         mb();
1421
1422         if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
1423                 list_del(&evt->queue);
1424                 del_timer(&evt->timer);
1425
1426                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1427                  * Firmware will send a CRQ with a transport event (0xFF) to
1428                  * tell this client what has happened to the transport. This
1429                  * will be handled in ibmvfc_handle_crq()
1430                  */
1431                 if (rc == H_CLOSED) {
1432                         if (printk_ratelimit())
1433                                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1434                         if (evt->cmnd)
1435                                 scsi_dma_unmap(evt->cmnd);
1436                         ibmvfc_free_event(evt);
1437                         return SCSI_MLQUEUE_HOST_BUSY;
1438                 }
1439
1440                 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1441                 if (evt->cmnd) {
1442                         evt->cmnd->result = DID_ERROR << 16;
1443                         evt->done = ibmvfc_scsi_eh_done;
1444                 } else
1445                         evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
1446
1447                 evt->done(evt);
1448         } else
1449                 ibmvfc_trc_start(evt);
1450
1451         return 0;
1452 }
1453
1454 /**
1455  * ibmvfc_log_error - Log an error for the failed command if appropriate
1456  * @evt:        ibmvfc event to log
1457  *
1458  **/
1459 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1460 {
1461         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1462         struct ibmvfc_host *vhost = evt->vhost;
1463         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1464         struct scsi_cmnd *cmnd = evt->cmnd;
1465         const char *err = unknown_error;
1466         int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
1467         int logerr = 0;
1468         int rsp_code = 0;
1469
1470         if (index >= 0) {
1471                 logerr = cmd_status[index].log;
1472                 err = cmd_status[index].name;
1473         }
1474
1475         if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1476                 return;
1477
1478         if (rsp->flags & FCP_RSP_LEN_VALID)
1479                 rsp_code = rsp->data.info.rsp_code;
1480
1481         scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1482                     "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1483                     cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1484                     rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1485 }
1486
1487 /**
1488  * ibmvfc_scsi_done - Handle responses from commands
1489  * @evt:        ibmvfc event to be handled
1490  *
1491  * Used as a callback when sending scsi cmds.
1492  **/
1493 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1494 {
1495         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1496         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1497         struct scsi_cmnd *cmnd = evt->cmnd;
1498         u32 rsp_len = 0;
1499         u32 sense_len = rsp->fcp_sense_len;
1500
1501         if (cmnd) {
1502                 if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
1503                         scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
1504                 else if (rsp->flags & FCP_RESID_UNDER)
1505                         scsi_set_resid(cmnd, rsp->fcp_resid);
1506                 else
1507                         scsi_set_resid(cmnd, 0);
1508
1509                 if (vfc_cmd->status) {
1510                         cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1511
1512                         if (rsp->flags & FCP_RSP_LEN_VALID)
1513                                 rsp_len = rsp->fcp_rsp_len;
1514                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1515                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1516                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1517                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1518                         if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
1519                                 ibmvfc_reinit_host(evt->vhost);
1520
1521                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1522                                 cmnd->result = (DID_ERROR << 16);
1523
1524                         ibmvfc_log_error(evt);
1525                 }
1526
1527                 if (!cmnd->result &&
1528                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1529                         cmnd->result = (DID_ERROR << 16);
1530
1531                 scsi_dma_unmap(cmnd);
1532                 cmnd->scsi_done(cmnd);
1533         }
1534
1535         if (evt->eh_comp)
1536                 complete(evt->eh_comp);
1537
1538         ibmvfc_free_event(evt);
1539 }
1540
1541 /**
1542  * ibmvfc_host_chkready - Check if the host can accept commands
1543  * @vhost:       struct ibmvfc host
1544  *
1545  * Returns:
1546  *      1 if host can accept command / 0 if not
1547  **/
1548 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1549 {
1550         int result = 0;
1551
1552         switch (vhost->state) {
1553         case IBMVFC_LINK_DEAD:
1554         case IBMVFC_HOST_OFFLINE:
1555                 result = DID_NO_CONNECT << 16;
1556                 break;
1557         case IBMVFC_NO_CRQ:
1558         case IBMVFC_INITIALIZING:
1559         case IBMVFC_HALTED:
1560         case IBMVFC_LINK_DOWN:
1561                 result = DID_REQUEUE << 16;
1562                 break;
1563         case IBMVFC_ACTIVE:
1564                 result = 0;
1565                 break;
1566         };
1567
1568         return result;
1569 }
1570
1571 /**
1572  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1573  * @cmnd:       struct scsi_cmnd to be executed
1574  * @done:       Callback function to be called when cmnd is completed
1575  *
1576  * Returns:
1577  *      0 on success / other on failure
1578  **/
1579 static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
1580                                void (*done) (struct scsi_cmnd *))
1581 {
1582         struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1583         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1584         struct ibmvfc_cmd *vfc_cmd;
1585         struct ibmvfc_event *evt;
1586         u8 tag[2];
1587         int rc;
1588
1589         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1590             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1591                 cmnd->result = rc;
1592                 done(cmnd);
1593                 return 0;
1594         }
1595
1596         cmnd->result = (DID_OK << 16);
1597         evt = ibmvfc_get_event(vhost);
1598         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1599         evt->cmnd = cmnd;
1600         cmnd->scsi_done = done;
1601         vfc_cmd = &evt->iu.cmd;
1602         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1603         vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1604         vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
1605         vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
1606         vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
1607         vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
1608         vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
1609         vfc_cmd->tgt_scsi_id = rport->port_id;
1610         vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
1611         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1612         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1613
1614         if (scsi_populate_tag_msg(cmnd, tag)) {
1615                 vfc_cmd->task_tag = tag[1];
1616                 switch (tag[0]) {
1617                 case MSG_SIMPLE_TAG:
1618                         vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1619                         break;
1620                 case MSG_HEAD_TAG:
1621                         vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
1622                         break;
1623                 case MSG_ORDERED_TAG:
1624                         vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
1625                         break;
1626                 };
1627         }
1628
1629         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1630                 return ibmvfc_send_event(evt, vhost, 0);
1631
1632         ibmvfc_free_event(evt);
1633         if (rc == -ENOMEM)
1634                 return SCSI_MLQUEUE_HOST_BUSY;
1635
1636         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1637                 scmd_printk(KERN_ERR, cmnd,
1638                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1639
1640         cmnd->result = DID_ERROR << 16;
1641         done(cmnd);
1642         return 0;
1643 }
1644
1645 /**
1646  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1647  * @evt:        ibmvfc event struct
1648  *
1649  **/
1650 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1651 {
1652         /* copy the response back */
1653         if (evt->sync_iu)
1654                 *evt->sync_iu = *evt->xfer_iu;
1655
1656         complete(&evt->comp);
1657 }
1658
1659 /**
1660  * ibmvfc_reset_device - Reset the device with the specified reset type
1661  * @sdev:       scsi device to reset
1662  * @type:       reset type
1663  * @desc:       reset type description for log messages
1664  *
1665  * Returns:
1666  *      0 on success / other on failure
1667  **/
1668 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1669 {
1670         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1671         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1672         struct ibmvfc_cmd *tmf;
1673         struct ibmvfc_event *evt = NULL;
1674         union ibmvfc_iu rsp_iu;
1675         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1676         int rsp_rc = -EBUSY;
1677         unsigned long flags;
1678         int rsp_code = 0;
1679
1680         spin_lock_irqsave(vhost->host->host_lock, flags);
1681         if (vhost->state == IBMVFC_ACTIVE) {
1682                 evt = ibmvfc_get_event(vhost);
1683                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1684
1685                 tmf = &evt->iu.cmd;
1686                 memset(tmf, 0, sizeof(*tmf));
1687                 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1688                 tmf->resp.len = sizeof(tmf->rsp);
1689                 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1690                 tmf->payload_len = sizeof(tmf->iu);
1691                 tmf->resp_len = sizeof(tmf->rsp);
1692                 tmf->cancel_key = (unsigned long)sdev->hostdata;
1693                 tmf->tgt_scsi_id = rport->port_id;
1694                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1695                 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1696                 tmf->iu.tmf_flags = type;
1697                 evt->sync_iu = &rsp_iu;
1698
1699                 init_completion(&evt->comp);
1700                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1701         }
1702         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1703
1704         if (rsp_rc != 0) {
1705                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
1706                             desc, rsp_rc);
1707                 return -EIO;
1708         }
1709
1710         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
1711         wait_for_completion(&evt->comp);
1712
1713         if (rsp_iu.cmd.status) {
1714                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
1715                         rsp_code = fc_rsp->data.info.rsp_code;
1716
1717                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
1718                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
1719                             desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
1720                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
1721                             fc_rsp->scsi_status);
1722                 rsp_rc = -EIO;
1723         } else
1724                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
1725
1726         spin_lock_irqsave(vhost->host->host_lock, flags);
1727         ibmvfc_free_event(evt);
1728         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1729         return rsp_rc;
1730 }
1731
1732 /**
1733  * ibmvfc_abort_task_set - Abort outstanding commands to the device
1734  * @sdev:       scsi device to abort commands
1735  *
1736  * This sends an Abort Task Set to the VIOS for the specified device. This does
1737  * NOT send any cancel to the VIOS. That must be done separately.
1738  *
1739  * Returns:
1740  *      0 on success / other on failure
1741  **/
1742 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
1743 {
1744         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1745         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1746         struct ibmvfc_cmd *tmf;
1747         struct ibmvfc_event *evt, *found_evt;
1748         union ibmvfc_iu rsp_iu;
1749         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1750         int rsp_rc = -EBUSY;
1751         unsigned long flags;
1752         int rsp_code = 0;
1753
1754         spin_lock_irqsave(vhost->host->host_lock, flags);
1755         found_evt = NULL;
1756         list_for_each_entry(evt, &vhost->sent, queue) {
1757                 if (evt->cmnd && evt->cmnd->device == sdev) {
1758                         found_evt = evt;
1759                         break;
1760                 }
1761         }
1762
1763         if (!found_evt) {
1764                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1765                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
1766                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1767                 return 0;
1768         }
1769
1770         if (vhost->state == IBMVFC_ACTIVE) {
1771                 evt = ibmvfc_get_event(vhost);
1772                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1773
1774                 tmf = &evt->iu.cmd;
1775                 memset(tmf, 0, sizeof(*tmf));
1776                 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1777                 tmf->resp.len = sizeof(tmf->rsp);
1778                 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1779                 tmf->payload_len = sizeof(tmf->iu);
1780                 tmf->resp_len = sizeof(tmf->rsp);
1781                 tmf->cancel_key = (unsigned long)sdev->hostdata;
1782                 tmf->tgt_scsi_id = rport->port_id;
1783                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1784                 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1785                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
1786                 evt->sync_iu = &rsp_iu;
1787
1788                 init_completion(&evt->comp);
1789                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1790         }
1791
1792         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1793
1794         if (rsp_rc != 0) {
1795                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
1796                 return -EIO;
1797         }
1798
1799         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
1800         wait_for_completion(&evt->comp);
1801
1802         if (rsp_iu.cmd.status) {
1803                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
1804                         rsp_code = fc_rsp->data.info.rsp_code;
1805
1806                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
1807                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
1808                             ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
1809                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
1810                             fc_rsp->scsi_status);
1811                 rsp_rc = -EIO;
1812         } else
1813                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
1814
1815         spin_lock_irqsave(vhost->host->host_lock, flags);
1816         ibmvfc_free_event(evt);
1817         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1818         return rsp_rc;
1819 }
1820
1821 /**
1822  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
1823  * @sdev:       scsi device to cancel commands
1824  * @type:       type of error recovery being performed
1825  *
1826  * This sends a cancel to the VIOS for the specified device. This does
1827  * NOT send any abort to the actual device. That must be done separately.
1828  *
1829  * Returns:
1830  *      0 on success / other on failure
1831  **/
1832 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
1833 {
1834         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1835         struct scsi_target *starget = scsi_target(sdev);
1836         struct fc_rport *rport = starget_to_rport(starget);
1837         struct ibmvfc_tmf *tmf;
1838         struct ibmvfc_event *evt, *found_evt;
1839         union ibmvfc_iu rsp;
1840         int rsp_rc = -EBUSY;
1841         unsigned long flags;
1842         u16 status;
1843
1844         ENTER;
1845         spin_lock_irqsave(vhost->host->host_lock, flags);
1846         found_evt = NULL;
1847         list_for_each_entry(evt, &vhost->sent, queue) {
1848                 if (evt->cmnd && evt->cmnd->device == sdev) {
1849                         found_evt = evt;
1850                         break;
1851                 }
1852         }
1853
1854         if (!found_evt) {
1855                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1856                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
1857                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1858                 return 0;
1859         }
1860
1861         if (vhost->state == IBMVFC_ACTIVE) {
1862                 evt = ibmvfc_get_event(vhost);
1863                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1864
1865                 tmf = &evt->iu.tmf;
1866                 memset(tmf, 0, sizeof(*tmf));
1867                 tmf->common.version = 1;
1868                 tmf->common.opcode = IBMVFC_TMF_MAD;
1869                 tmf->common.length = sizeof(*tmf);
1870                 tmf->scsi_id = rport->port_id;
1871                 int_to_scsilun(sdev->lun, &tmf->lun);
1872                 tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
1873                 tmf->cancel_key = (unsigned long)sdev->hostdata;
1874                 tmf->my_cancel_key = (unsigned long)starget->hostdata;
1875
1876                 evt->sync_iu = &rsp;
1877                 init_completion(&evt->comp);
1878                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1879         }
1880
1881         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1882
1883         if (rsp_rc != 0) {
1884                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
1885                 return -EIO;
1886         }
1887
1888         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
1889
1890         wait_for_completion(&evt->comp);
1891         status = rsp.mad_common.status;
1892         spin_lock_irqsave(vhost->host->host_lock, flags);
1893         ibmvfc_free_event(evt);
1894         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1895
1896         if (status != IBMVFC_MAD_SUCCESS) {
1897                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
1898                 return -EIO;
1899         }
1900
1901         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
1902         return 0;
1903 }
1904
1905 /**
1906  * ibmvfc_match_target - Match function for specified target
1907  * @evt:        ibmvfc event struct
1908  * @device:     device to match (starget)
1909  *
1910  * Returns:
1911  *      1 if event matches starget / 0 if event does not match starget
1912  **/
1913 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
1914 {
1915         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
1916                 return 1;
1917         return 0;
1918 }
1919
1920 /**
1921  * ibmvfc_match_lun - Match function for specified LUN
1922  * @evt:        ibmvfc event struct
1923  * @device:     device to match (sdev)
1924  *
1925  * Returns:
1926  *      1 if event matches sdev / 0 if event does not match sdev
1927  **/
1928 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
1929 {
1930         if (evt->cmnd && evt->cmnd->device == device)
1931                 return 1;
1932         return 0;
1933 }
1934
1935 /**
1936  * ibmvfc_wait_for_ops - Wait for ops to complete
1937  * @vhost:      ibmvfc host struct
1938  * @device:     device to match (starget or sdev)
1939  * @match:      match function
1940  *
1941  * Returns:
1942  *      SUCCESS / FAILED
1943  **/
1944 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
1945                                int (*match) (struct ibmvfc_event *, void *))
1946 {
1947         struct ibmvfc_event *evt;
1948         DECLARE_COMPLETION_ONSTACK(comp);
1949         int wait;
1950         unsigned long flags;
1951         signed long timeout = init_timeout * HZ;
1952
1953         ENTER;
1954         do {
1955                 wait = 0;
1956                 spin_lock_irqsave(vhost->host->host_lock, flags);
1957                 list_for_each_entry(evt, &vhost->sent, queue) {
1958                         if (match(evt, device)) {
1959                                 evt->eh_comp = &comp;
1960                                 wait++;
1961                         }
1962                 }
1963                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1964
1965                 if (wait) {
1966                         timeout = wait_for_completion_timeout(&comp, timeout);
1967
1968                         if (!timeout) {
1969                                 wait = 0;
1970                                 spin_lock_irqsave(vhost->host->host_lock, flags);
1971                                 list_for_each_entry(evt, &vhost->sent, queue) {
1972                                         if (match(evt, device)) {
1973                                                 evt->eh_comp = NULL;
1974                                                 wait++;
1975                                         }
1976                                 }
1977                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1978                                 if (wait)
1979                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
1980                                 LEAVE;
1981                                 return wait ? FAILED : SUCCESS;
1982                         }
1983                 }
1984         } while (wait);
1985
1986         LEAVE;
1987         return SUCCESS;
1988 }
1989
1990 /**
1991  * ibmvfc_eh_abort_handler - Abort a command
1992  * @cmd:        scsi command to abort
1993  *
1994  * Returns:
1995  *      SUCCESS / FAILED
1996  **/
1997 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
1998 {
1999         struct scsi_device *sdev = cmd->device;
2000         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2001         int cancel_rc, abort_rc;
2002         int rc = FAILED;
2003
2004         ENTER;
2005         ibmvfc_wait_while_resetting(vhost);
2006         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2007         abort_rc = ibmvfc_abort_task_set(sdev);
2008
2009         if (!cancel_rc && !abort_rc)
2010                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2011
2012         LEAVE;
2013         return rc;
2014 }
2015
2016 /**
2017  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2018  * @cmd:        scsi command struct
2019  *
2020  * Returns:
2021  *      SUCCESS / FAILED
2022  **/
2023 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2024 {
2025         struct scsi_device *sdev = cmd->device;
2026         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2027         int cancel_rc, reset_rc;
2028         int rc = FAILED;
2029
2030         ENTER;
2031         ibmvfc_wait_while_resetting(vhost);
2032         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2033         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2034
2035         if (!cancel_rc && !reset_rc)
2036                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2037
2038         LEAVE;
2039         return rc;
2040 }
2041
2042 /**
2043  * ibmvfc_dev_cancel_all - Device iterated cancel all function
2044  * @sdev:       scsi device struct
2045  * @data:       return code
2046  *
2047  **/
2048 static void ibmvfc_dev_cancel_all(struct scsi_device *sdev, void *data)
2049 {
2050         unsigned long *rc = data;
2051         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2052 }
2053
2054 /**
2055  * ibmvfc_dev_abort_all - Device iterated abort task set function
2056  * @sdev:       scsi device struct
2057  * @data:       return code
2058  *
2059  **/
2060 static void ibmvfc_dev_abort_all(struct scsi_device *sdev, void *data)
2061 {
2062         unsigned long *rc = data;
2063         *rc |= ibmvfc_abort_task_set(sdev);
2064 }
2065
2066 /**
2067  * ibmvfc_eh_target_reset_handler - Reset the target
2068  * @cmd:        scsi command struct
2069  *
2070  * Returns:
2071  *      SUCCESS / FAILED
2072  **/
2073 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2074 {
2075         struct scsi_device *sdev = cmd->device;
2076         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2077         struct scsi_target *starget = scsi_target(sdev);
2078         int reset_rc;
2079         int rc = FAILED;
2080         unsigned long cancel_rc = 0;
2081
2082         ENTER;
2083         ibmvfc_wait_while_resetting(vhost);
2084         starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
2085         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2086
2087         if (!cancel_rc && !reset_rc)
2088                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2089
2090         LEAVE;
2091         return rc;
2092 }
2093
2094 /**
2095  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2096  * @cmd:        struct scsi_cmnd having problems
2097  *
2098  **/
2099 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2100 {
2101         int rc;
2102         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2103
2104         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2105         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2106         return rc ? FAILED : SUCCESS;
2107 }
2108
2109 /**
2110  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2111  * @rport:              rport struct
2112  *
2113  * Return value:
2114  *      none
2115  **/
2116 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2117 {
2118         struct scsi_target *starget = to_scsi_target(&rport->dev);
2119         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2120         struct ibmvfc_host *vhost = shost_priv(shost);
2121         unsigned long cancel_rc = 0;
2122         unsigned long abort_rc = 0;
2123         int rc = FAILED;
2124
2125         ENTER;
2126         starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
2127         starget_for_each_device(starget, &abort_rc, ibmvfc_dev_abort_all);
2128
2129         if (!cancel_rc && !abort_rc)
2130                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2131
2132         if (rc == FAILED)
2133                 ibmvfc_issue_fc_host_lip(shost);
2134         LEAVE;
2135 }
2136
2137 static const struct {
2138         enum ibmvfc_async_event ae;
2139         const char *desc;
2140 } ae_desc [] = {
2141         { IBMVFC_AE_ELS_PLOGI,          "PLOGI" },
2142         { IBMVFC_AE_ELS_LOGO,           "LOGO" },
2143         { IBMVFC_AE_ELS_PRLO,           "PRLO" },
2144         { IBMVFC_AE_SCN_NPORT,          "N-Port SCN" },
2145         { IBMVFC_AE_SCN_GROUP,          "Group SCN" },
2146         { IBMVFC_AE_SCN_DOMAIN,         "Domain SCN" },
2147         { IBMVFC_AE_SCN_FABRIC,         "Fabric SCN" },
2148         { IBMVFC_AE_LINK_UP,            "Link Up" },
2149         { IBMVFC_AE_LINK_DOWN,          "Link Down" },
2150         { IBMVFC_AE_LINK_DEAD,          "Link Dead" },
2151         { IBMVFC_AE_HALT,                       "Halt" },
2152         { IBMVFC_AE_RESUME,             "Resume" },
2153         { IBMVFC_AE_ADAPTER_FAILED,     "Adapter Failed" },
2154 };
2155
2156 static const char *unknown_ae = "Unknown async";
2157
2158 /**
2159  * ibmvfc_get_ae_desc - Get text description for async event
2160  * @ae: async event
2161  *
2162  **/
2163 static const char *ibmvfc_get_ae_desc(u64 ae)
2164 {
2165         int i;
2166
2167         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2168                 if (ae_desc[i].ae == ae)
2169                         return ae_desc[i].desc;
2170
2171         return unknown_ae;
2172 }
2173
2174 /**
2175  * ibmvfc_handle_async - Handle an async event from the adapter
2176  * @crq:        crq to process
2177  * @vhost:      ibmvfc host struct
2178  *
2179  **/
2180 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2181                                 struct ibmvfc_host *vhost)
2182 {
2183         const char *desc = ibmvfc_get_ae_desc(crq->event);
2184
2185         ibmvfc_log(vhost, 3, "%s event received. scsi_id: %llx, wwpn: %llx,"
2186                    " node_name: %llx\n", desc, crq->scsi_id, crq->wwpn, crq->node_name);
2187
2188         switch (crq->event) {
2189         case IBMVFC_AE_RESUME:
2190                 switch (crq->link_state) {
2191                 case IBMVFC_AE_LS_LINK_DOWN:
2192                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2193                         break;
2194                 case IBMVFC_AE_LS_LINK_DEAD:
2195                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2196                         break;
2197                 case IBMVFC_AE_LS_LINK_UP:
2198                 case IBMVFC_AE_LS_LINK_BOUNCED:
2199                 default:
2200                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2201                         vhost->delay_init = 1;
2202                         __ibmvfc_reset_host(vhost);
2203                         break;
2204                 };
2205
2206                 break;
2207         case IBMVFC_AE_LINK_UP:
2208                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2209                 vhost->delay_init = 1;
2210                 __ibmvfc_reset_host(vhost);
2211                 break;
2212         case IBMVFC_AE_SCN_FABRIC:
2213         case IBMVFC_AE_SCN_DOMAIN:
2214                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2215                 vhost->delay_init = 1;
2216                 __ibmvfc_reset_host(vhost);
2217                 break;
2218         case IBMVFC_AE_SCN_NPORT:
2219         case IBMVFC_AE_SCN_GROUP:
2220                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2221         case IBMVFC_AE_ELS_LOGO:
2222         case IBMVFC_AE_ELS_PRLO:
2223         case IBMVFC_AE_ELS_PLOGI:
2224                 ibmvfc_reinit_host(vhost);
2225                 break;
2226         case IBMVFC_AE_LINK_DOWN:
2227         case IBMVFC_AE_ADAPTER_FAILED:
2228                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2229                 break;
2230         case IBMVFC_AE_LINK_DEAD:
2231                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2232                 break;
2233         case IBMVFC_AE_HALT:
2234                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2235                 break;
2236         default:
2237                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2238                 break;
2239         };
2240 }
2241
2242 /**
2243  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2244  * @crq:        Command/Response queue
2245  * @vhost:      ibmvfc host struct
2246  *
2247  **/
2248 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2249 {
2250         long rc;
2251         struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
2252
2253         switch (crq->valid) {
2254         case IBMVFC_CRQ_INIT_RSP:
2255                 switch (crq->format) {
2256                 case IBMVFC_CRQ_INIT:
2257                         dev_info(vhost->dev, "Partner initialized\n");
2258                         /* Send back a response */
2259                         rc = ibmvfc_send_crq_init_complete(vhost);
2260                         if (rc == 0)
2261                                 ibmvfc_init_host(vhost, 0);
2262                         else
2263                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2264                         break;
2265                 case IBMVFC_CRQ_INIT_COMPLETE:
2266                         dev_info(vhost->dev, "Partner initialization complete\n");
2267                         ibmvfc_init_host(vhost, 0);
2268                         break;
2269                 default:
2270                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2271                 }
2272                 return;
2273         case IBMVFC_CRQ_XPORT_EVENT:
2274                 vhost->state = IBMVFC_NO_CRQ;
2275                 vhost->logged_in = 0;
2276                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2277                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2278                         /* We need to re-setup the interpartition connection */
2279                         dev_info(vhost->dev, "Re-enabling adapter\n");
2280                         vhost->client_migrated = 1;
2281                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2282                         if ((rc = ibmvfc_reenable_crq_queue(vhost)) ||
2283                             (rc = ibmvfc_send_crq_init(vhost))) {
2284                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2285                                 dev_err(vhost->dev, "Error after enable (rc=%ld)\n", rc);
2286                         } else
2287                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2288                 } else {
2289                         dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2290
2291                         ibmvfc_purge_requests(vhost, DID_ERROR);
2292                         if ((rc = ibmvfc_reset_crq(vhost)) ||
2293                             (rc = ibmvfc_send_crq_init(vhost))) {
2294                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2295                                 dev_err(vhost->dev, "Error after reset (rc=%ld)\n", rc);
2296                         } else
2297                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2298                 }
2299                 return;
2300         case IBMVFC_CRQ_CMD_RSP:
2301                 break;
2302         default:
2303                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2304                 return;
2305         }
2306
2307         if (crq->format == IBMVFC_ASYNC_EVENT)
2308                 return;
2309
2310         /* The only kind of payload CRQs we should get are responses to
2311          * things we send. Make sure this response is to something we
2312          * actually sent
2313          */
2314         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2315                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2316                         crq->ioba);
2317                 return;
2318         }
2319
2320         if (unlikely(atomic_read(&evt->free))) {
2321                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2322                         crq->ioba);
2323                 return;
2324         }
2325
2326         del_timer(&evt->timer);
2327         list_del(&evt->queue);
2328         ibmvfc_trc_end(evt);
2329         evt->done(evt);
2330 }
2331
2332 /**
2333  * ibmvfc_scan_finished - Check if the device scan is done.
2334  * @shost:      scsi host struct
2335  * @time:       current elapsed time
2336  *
2337  * Returns:
2338  *      0 if scan is not done / 1 if scan is done
2339  **/
2340 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2341 {
2342         unsigned long flags;
2343         struct ibmvfc_host *vhost = shost_priv(shost);
2344         int done = 0;
2345
2346         spin_lock_irqsave(shost->host_lock, flags);
2347         if (time >= (init_timeout * HZ)) {
2348                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2349                          "continuing initialization\n", init_timeout);
2350                 done = 1;
2351         }
2352
2353         if (vhost->scan_complete)
2354                 done = 1;
2355         spin_unlock_irqrestore(shost->host_lock, flags);
2356         return done;
2357 }
2358
2359 /**
2360  * ibmvfc_slave_alloc - Setup the device's task set value
2361  * @sdev:       struct scsi_device device to configure
2362  *
2363  * Set the device's task set value so that error handling works as
2364  * expected.
2365  *
2366  * Returns:
2367  *      0 on success / -ENXIO if device does not exist
2368  **/
2369 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2370 {
2371         struct Scsi_Host *shost = sdev->host;
2372         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2373         struct ibmvfc_host *vhost = shost_priv(shost);
2374         unsigned long flags = 0;
2375
2376         if (!rport || fc_remote_port_chkready(rport))
2377                 return -ENXIO;
2378
2379         spin_lock_irqsave(shost->host_lock, flags);
2380         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2381         spin_unlock_irqrestore(shost->host_lock, flags);
2382         return 0;
2383 }
2384
2385 /**
2386  * ibmvfc_target_alloc - Setup the target's task set value
2387  * @starget:    struct scsi_target
2388  *
2389  * Set the target's task set value so that error handling works as
2390  * expected.
2391  *
2392  * Returns:
2393  *      0 on success / -ENXIO if device does not exist
2394  **/
2395 static int ibmvfc_target_alloc(struct scsi_target *starget)
2396 {
2397         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2398         struct ibmvfc_host *vhost = shost_priv(shost);
2399         unsigned long flags = 0;
2400
2401         spin_lock_irqsave(shost->host_lock, flags);
2402         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2403         spin_unlock_irqrestore(shost->host_lock, flags);
2404         return 0;
2405 }
2406
2407 /**
2408  * ibmvfc_slave_configure - Configure the device
2409  * @sdev:       struct scsi_device device to configure
2410  *
2411  * Enable allow_restart for a device if it is a disk. Adjust the
2412  * queue_depth here also.
2413  *
2414  * Returns:
2415  *      0
2416  **/
2417 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2418 {
2419         struct Scsi_Host *shost = sdev->host;
2420         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
2421         unsigned long flags = 0;
2422
2423         spin_lock_irqsave(shost->host_lock, flags);
2424         if (sdev->type == TYPE_DISK)
2425                 sdev->allow_restart = 1;
2426
2427         if (sdev->tagged_supported) {
2428                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2429                 scsi_activate_tcq(sdev, sdev->queue_depth);
2430         } else
2431                 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2432
2433         rport->dev_loss_tmo = dev_loss_tmo;
2434         spin_unlock_irqrestore(shost->host_lock, flags);
2435         return 0;
2436 }
2437
2438 /**
2439  * ibmvfc_change_queue_depth - Change the device's queue depth
2440  * @sdev:       scsi device struct
2441  * @qdepth:     depth to set
2442  *
2443  * Return value:
2444  *      actual depth set
2445  **/
2446 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2447 {
2448         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2449                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2450
2451         scsi_adjust_queue_depth(sdev, 0, qdepth);
2452         return sdev->queue_depth;
2453 }
2454
2455 /**
2456  * ibmvfc_change_queue_type - Change the device's queue type
2457  * @sdev:               scsi device struct
2458  * @tag_type:   type of tags to use
2459  *
2460  * Return value:
2461  *      actual queue type set
2462  **/
2463 static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
2464 {
2465         if (sdev->tagged_supported) {
2466                 scsi_set_tag_type(sdev, tag_type);
2467
2468                 if (tag_type)
2469                         scsi_activate_tcq(sdev, sdev->queue_depth);
2470                 else
2471                         scsi_deactivate_tcq(sdev, sdev->queue_depth);
2472         } else
2473                 tag_type = 0;
2474
2475         return tag_type;
2476 }
2477
2478 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2479                                                  struct device_attribute *attr, char *buf)
2480 {
2481         struct Scsi_Host *shost = class_to_shost(dev);
2482         struct ibmvfc_host *vhost = shost_priv(shost);
2483
2484         return snprintf(buf, PAGE_SIZE, "%s\n",
2485                         vhost->login_buf->resp.partition_name);
2486 }
2487
2488 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2489                                             struct device_attribute *attr, char *buf)
2490 {
2491         struct Scsi_Host *shost = class_to_shost(dev);
2492         struct ibmvfc_host *vhost = shost_priv(shost);
2493
2494         return snprintf(buf, PAGE_SIZE, "%s\n",
2495                         vhost->login_buf->resp.device_name);
2496 }
2497
2498 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2499                                          struct device_attribute *attr, char *buf)
2500 {
2501         struct Scsi_Host *shost = class_to_shost(dev);
2502         struct ibmvfc_host *vhost = shost_priv(shost);
2503
2504         return snprintf(buf, PAGE_SIZE, "%s\n",
2505                         vhost->login_buf->resp.port_loc_code);
2506 }
2507
2508 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2509                                          struct device_attribute *attr, char *buf)
2510 {
2511         struct Scsi_Host *shost = class_to_shost(dev);
2512         struct ibmvfc_host *vhost = shost_priv(shost);
2513
2514         return snprintf(buf, PAGE_SIZE, "%s\n",
2515                         vhost->login_buf->resp.drc_name);
2516 }
2517
2518 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2519                                              struct device_attribute *attr, char *buf)
2520 {
2521         struct Scsi_Host *shost = class_to_shost(dev);
2522         struct ibmvfc_host *vhost = shost_priv(shost);
2523         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2524 }
2525
2526 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2527                                              struct device_attribute *attr, char *buf)
2528 {
2529         struct Scsi_Host *shost = class_to_shost(dev);
2530         struct ibmvfc_host *vhost = shost_priv(shost);
2531         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2532 }
2533
2534 /**
2535  * ibmvfc_show_log_level - Show the adapter's error logging level
2536  * @dev:        class device struct
2537  * @buf:        buffer
2538  *
2539  * Return value:
2540  *      number of bytes printed to buffer
2541  **/
2542 static ssize_t ibmvfc_show_log_level(struct device *dev,
2543                                      struct device_attribute *attr, char *buf)
2544 {
2545         struct Scsi_Host *shost = class_to_shost(dev);
2546         struct ibmvfc_host *vhost = shost_priv(shost);
2547         unsigned long flags = 0;
2548         int len;
2549
2550         spin_lock_irqsave(shost->host_lock, flags);
2551         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2552         spin_unlock_irqrestore(shost->host_lock, flags);
2553         return len;
2554 }
2555
2556 /**
2557  * ibmvfc_store_log_level - Change the adapter's error logging level
2558  * @dev:        class device struct
2559  * @buf:        buffer
2560  *
2561  * Return value:
2562  *      number of bytes printed to buffer
2563  **/
2564 static ssize_t ibmvfc_store_log_level(struct device *dev,
2565                                       struct device_attribute *attr,
2566                                       const char *buf, size_t count)
2567 {
2568         struct Scsi_Host *shost = class_to_shost(dev);
2569         struct ibmvfc_host *vhost = shost_priv(shost);
2570         unsigned long flags = 0;
2571
2572         spin_lock_irqsave(shost->host_lock, flags);
2573         vhost->log_level = simple_strtoul(buf, NULL, 10);
2574         spin_unlock_irqrestore(shost->host_lock, flags);
2575         return strlen(buf);
2576 }
2577
2578 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
2579 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
2580 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
2581 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
2582 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
2583 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
2584 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
2585                    ibmvfc_show_log_level, ibmvfc_store_log_level);
2586
2587 #ifdef CONFIG_SCSI_IBMVFC_TRACE
2588 /**
2589  * ibmvfc_read_trace - Dump the adapter trace
2590  * @kobj:               kobject struct
2591  * @bin_attr:   bin_attribute struct
2592  * @buf:                buffer
2593  * @off:                offset
2594  * @count:              buffer size
2595  *
2596  * Return value:
2597  *      number of bytes printed to buffer
2598  **/
2599 static ssize_t ibmvfc_read_trace(struct kobject *kobj,
2600                                  struct bin_attribute *bin_attr,
2601                                  char *buf, loff_t off, size_t count)
2602 {
2603         struct device *dev = container_of(kobj, struct device, kobj);
2604         struct Scsi_Host *shost = class_to_shost(dev);
2605         struct ibmvfc_host *vhost = shost_priv(shost);
2606         unsigned long flags = 0;
2607         int size = IBMVFC_TRACE_SIZE;
2608         char *src = (char *)vhost->trace;
2609
2610         if (off > size)
2611                 return 0;
2612         if (off + count > size) {
2613                 size -= off;
2614                 count = size;
2615         }
2616
2617         spin_lock_irqsave(shost->host_lock, flags);
2618         memcpy(buf, &src[off], count);
2619         spin_unlock_irqrestore(shost->host_lock, flags);
2620         return count;
2621 }
2622
2623 static struct bin_attribute ibmvfc_trace_attr = {
2624         .attr = {
2625                 .name = "trace",
2626                 .mode = S_IRUGO,
2627         },
2628         .size = 0,
2629         .read = ibmvfc_read_trace,
2630 };
2631 #endif
2632
2633 static struct device_attribute *ibmvfc_attrs[] = {
2634         &dev_attr_partition_name,
2635         &dev_attr_device_name,
2636         &dev_attr_port_loc_code,
2637         &dev_attr_drc_name,
2638         &dev_attr_npiv_version,
2639         &dev_attr_capabilities,
2640         &dev_attr_log_level,
2641         NULL
2642 };
2643
2644 static struct scsi_host_template driver_template = {
2645         .module = THIS_MODULE,
2646         .name = "IBM POWER Virtual FC Adapter",
2647         .proc_name = IBMVFC_NAME,
2648         .queuecommand = ibmvfc_queuecommand,
2649         .eh_abort_handler = ibmvfc_eh_abort_handler,
2650         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
2651         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
2652         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
2653         .slave_alloc = ibmvfc_slave_alloc,
2654         .slave_configure = ibmvfc_slave_configure,
2655         .target_alloc = ibmvfc_target_alloc,
2656         .scan_finished = ibmvfc_scan_finished,
2657         .change_queue_depth = ibmvfc_change_queue_depth,
2658         .change_queue_type = ibmvfc_change_queue_type,
2659         .cmd_per_lun = 16,
2660         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
2661         .this_id = -1,
2662         .sg_tablesize = SG_ALL,
2663         .max_sectors = IBMVFC_MAX_SECTORS,
2664         .use_clustering = ENABLE_CLUSTERING,
2665         .shost_attrs = ibmvfc_attrs,
2666 };
2667
2668 /**
2669  * ibmvfc_next_async_crq - Returns the next entry in async queue
2670  * @vhost:      ibmvfc host struct
2671  *
2672  * Returns:
2673  *      Pointer to next entry in queue / NULL if empty
2674  **/
2675 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
2676 {
2677         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
2678         struct ibmvfc_async_crq *crq;
2679
2680         crq = &async_crq->msgs[async_crq->cur];
2681         if (crq->valid & 0x80) {
2682                 if (++async_crq->cur == async_crq->size)
2683                         async_crq->cur = 0;
2684         } else
2685                 crq = NULL;
2686
2687         return crq;
2688 }
2689
2690 /**
2691  * ibmvfc_next_crq - Returns the next entry in message queue
2692  * @vhost:      ibmvfc host struct
2693  *
2694  * Returns:
2695  *      Pointer to next entry in queue / NULL if empty
2696  **/
2697 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
2698 {
2699         struct ibmvfc_crq_queue *queue = &vhost->crq;
2700         struct ibmvfc_crq *crq;
2701
2702         crq = &queue->msgs[queue->cur];
2703         if (crq->valid & 0x80) {
2704                 if (++queue->cur == queue->size)
2705                         queue->cur = 0;
2706         } else
2707                 crq = NULL;
2708
2709         return crq;
2710 }
2711
2712 /**
2713  * ibmvfc_interrupt - Interrupt handler
2714  * @irq:                number of irq to handle, not used
2715  * @dev_instance: ibmvfc_host that received interrupt
2716  *
2717  * Returns:
2718  *      IRQ_HANDLED
2719  **/
2720 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
2721 {
2722         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
2723         unsigned long flags;
2724
2725         spin_lock_irqsave(vhost->host->host_lock, flags);
2726         vio_disable_interrupts(to_vio_dev(vhost->dev));
2727         tasklet_schedule(&vhost->tasklet);
2728         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2729         return IRQ_HANDLED;
2730 }
2731
2732 /**
2733  * ibmvfc_tasklet - Interrupt handler tasklet
2734  * @data:               ibmvfc host struct
2735  *
2736  * Returns:
2737  *      Nothing
2738  **/
2739 static void ibmvfc_tasklet(void *data)
2740 {
2741         struct ibmvfc_host *vhost = data;
2742         struct vio_dev *vdev = to_vio_dev(vhost->dev);
2743         struct ibmvfc_crq *crq;
2744         struct ibmvfc_async_crq *async;
2745         unsigned long flags;
2746         int done = 0;
2747
2748         spin_lock_irqsave(vhost->host->host_lock, flags);
2749         while (!done) {
2750                 /* Pull all the valid messages off the CRQ */
2751                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
2752                         ibmvfc_handle_crq(crq, vhost);
2753                         crq->valid = 0;
2754                 }
2755
2756                 /* Pull all the valid messages off the async CRQ */
2757                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
2758                         ibmvfc_handle_async(async, vhost);
2759                         async->valid = 0;
2760                 }
2761
2762                 vio_enable_interrupts(vdev);
2763                 if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
2764                         vio_disable_interrupts(vdev);
2765                         ibmvfc_handle_crq(crq, vhost);
2766                         crq->valid = 0;
2767                 } else if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
2768                         vio_disable_interrupts(vdev);
2769                         ibmvfc_handle_async(async, vhost);
2770                         async->valid = 0;
2771                 } else
2772                         done = 1;
2773         }
2774
2775         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2776 }
2777
2778 /**
2779  * ibmvfc_init_tgt - Set the next init job step for the target
2780  * @tgt:                ibmvfc target struct
2781  * @job_step:   job step to perform
2782  *
2783  **/
2784 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
2785                             void (*job_step) (struct ibmvfc_target *))
2786 {
2787         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
2788         tgt->job_step = job_step;
2789         wake_up(&tgt->vhost->work_wait_q);
2790 }
2791
2792 /**
2793  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
2794  * @tgt:                ibmvfc target struct
2795  * @job_step:   initialization job step
2796  *
2797  * Returns: 1 if step will be retried / 0 if not
2798  *
2799  **/
2800 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
2801                                   void (*job_step) (struct ibmvfc_target *))
2802 {
2803         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
2804                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2805                 wake_up(&tgt->vhost->work_wait_q);
2806                 return 0;
2807         } else
2808                 ibmvfc_init_tgt(tgt, job_step);
2809         return 1;
2810 }
2811
2812 /* Defined in FC-LS */
2813 static const struct {
2814         int code;
2815         int retry;
2816         int logged_in;
2817 } prli_rsp [] = {
2818         { 0, 1, 0 },
2819         { 1, 0, 1 },
2820         { 2, 1, 0 },
2821         { 3, 1, 0 },
2822         { 4, 0, 0 },
2823         { 5, 0, 0 },
2824         { 6, 0, 1 },
2825         { 7, 0, 0 },
2826         { 8, 1, 0 },
2827 };
2828
2829 /**
2830  * ibmvfc_get_prli_rsp - Find PRLI response index
2831  * @flags:      PRLI response flags
2832  *
2833  **/
2834 static int ibmvfc_get_prli_rsp(u16 flags)
2835 {
2836         int i;
2837         int code = (flags & 0x0f00) >> 8;
2838
2839         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
2840                 if (prli_rsp[i].code == code)
2841                         return i;
2842
2843         return 0;
2844 }
2845
2846 /**
2847  * ibmvfc_tgt_prli_done - Completion handler for Process Login
2848  * @evt:        ibmvfc event struct
2849  *
2850  **/
2851 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
2852 {
2853         struct ibmvfc_target *tgt = evt->tgt;
2854         struct ibmvfc_host *vhost = evt->vhost;
2855         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
2856         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
2857         u32 status = rsp->common.status;
2858         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
2859
2860         vhost->discovery_threads--;
2861         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2862         switch (status) {
2863         case IBMVFC_MAD_SUCCESS:
2864                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
2865                         parms->type, parms->flags, parms->service_parms);
2866
2867                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
2868                         index = ibmvfc_get_prli_rsp(parms->flags);
2869                         if (prli_rsp[index].logged_in) {
2870                                 if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) {
2871                                         tgt->need_login = 0;
2872                                         tgt->ids.roles = 0;
2873                                         if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC)
2874                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
2875                                         if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC)
2876                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
2877                                         tgt->add_rport = 1;
2878                                 } else
2879                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2880                         } else if (prli_rsp[index].retry)
2881                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2882                         else
2883                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2884                 } else
2885                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2886                 break;
2887         case IBMVFC_MAD_DRIVER_FAILED:
2888                 break;
2889         case IBMVFC_MAD_CRQ_ERROR:
2890                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2891                 break;
2892         case IBMVFC_MAD_FAILED:
2893         default:
2894                 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
2895                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2896                 else
2897                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2898
2899                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
2900                         ibmvfc_get_cmd_error(rsp->status, rsp->error),
2901                         rsp->status, rsp->error, status);
2902                 break;
2903         };
2904
2905         kref_put(&tgt->kref, ibmvfc_release_tgt);
2906         ibmvfc_free_event(evt);
2907         wake_up(&vhost->work_wait_q);
2908 }
2909
2910 /**
2911  * ibmvfc_tgt_send_prli - Send a process login
2912  * @tgt:        ibmvfc target struct
2913  *
2914  **/
2915 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
2916 {
2917         struct ibmvfc_process_login *prli;
2918         struct ibmvfc_host *vhost = tgt->vhost;
2919         struct ibmvfc_event *evt;
2920
2921         if (vhost->discovery_threads >= disc_threads)
2922                 return;
2923
2924         kref_get(&tgt->kref);
2925         evt = ibmvfc_get_event(vhost);
2926         vhost->discovery_threads++;
2927         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
2928         evt->tgt = tgt;
2929         prli = &evt->iu.prli;
2930         memset(prli, 0, sizeof(*prli));
2931         prli->common.version = 1;
2932         prli->common.opcode = IBMVFC_PROCESS_LOGIN;
2933         prli->common.length = sizeof(*prli);
2934         prli->scsi_id = tgt->scsi_id;
2935
2936         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
2937         prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
2938         prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
2939
2940         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2941         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2942                 vhost->discovery_threads--;
2943                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2944                 kref_put(&tgt->kref, ibmvfc_release_tgt);
2945         } else
2946                 tgt_dbg(tgt, "Sent process login\n");
2947 }
2948
2949 /**
2950  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
2951  * @evt:        ibmvfc event struct
2952  *
2953  **/
2954 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
2955 {
2956         struct ibmvfc_target *tgt = evt->tgt;
2957         struct ibmvfc_host *vhost = evt->vhost;
2958         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
2959         u32 status = rsp->common.status;
2960         int level = IBMVFC_DEFAULT_LOG_LEVEL;
2961
2962         vhost->discovery_threads--;
2963         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2964         switch (status) {
2965         case IBMVFC_MAD_SUCCESS:
2966                 tgt_dbg(tgt, "Port Login succeeded\n");
2967                 if (tgt->ids.port_name &&
2968                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
2969                         vhost->reinit = 1;
2970                         tgt_dbg(tgt, "Port re-init required\n");
2971                         break;
2972                 }
2973                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
2974                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
2975                 tgt->ids.port_id = tgt->scsi_id;
2976                 memcpy(&tgt->service_parms, &rsp->service_parms,
2977                        sizeof(tgt->service_parms));
2978                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
2979                        sizeof(tgt->service_parms_change));
2980                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
2981                 break;
2982         case IBMVFC_MAD_DRIVER_FAILED:
2983                 break;
2984         case IBMVFC_MAD_CRQ_ERROR:
2985                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
2986                 break;
2987         case IBMVFC_MAD_FAILED:
2988         default:
2989                 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
2990                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
2991                 else
2992                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2993
2994                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
2995                         ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
2996                         ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
2997                         ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
2998                 break;
2999         };
3000
3001         kref_put(&tgt->kref, ibmvfc_release_tgt);
3002         ibmvfc_free_event(evt);
3003         wake_up(&vhost->work_wait_q);
3004 }
3005
3006 /**
3007  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3008  * @tgt:        ibmvfc target struct
3009  *
3010  **/
3011 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3012 {
3013         struct ibmvfc_port_login *plogi;
3014         struct ibmvfc_host *vhost = tgt->vhost;
3015         struct ibmvfc_event *evt;
3016
3017         if (vhost->discovery_threads >= disc_threads)
3018                 return;
3019
3020         kref_get(&tgt->kref);
3021         evt = ibmvfc_get_event(vhost);
3022         vhost->discovery_threads++;
3023         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3024         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3025         evt->tgt = tgt;
3026         plogi = &evt->iu.plogi;
3027         memset(plogi, 0, sizeof(*plogi));
3028         plogi->common.version = 1;
3029         plogi->common.opcode = IBMVFC_PORT_LOGIN;
3030         plogi->common.length = sizeof(*plogi);
3031         plogi->scsi_id = tgt->scsi_id;
3032
3033         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3034                 vhost->discovery_threads--;
3035                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3036                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3037         } else
3038                 tgt_dbg(tgt, "Sent port login\n");
3039 }
3040
3041 /**
3042  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3043  * @evt:        ibmvfc event struct
3044  *
3045  **/
3046 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3047 {
3048         struct ibmvfc_target *tgt = evt->tgt;
3049         struct ibmvfc_host *vhost = evt->vhost;
3050         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3051         u32 status = rsp->common.status;
3052
3053         vhost->discovery_threads--;
3054         ibmvfc_free_event(evt);
3055         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3056
3057         switch (status) {
3058         case IBMVFC_MAD_SUCCESS:
3059                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3060                 break;
3061         case IBMVFC_MAD_DRIVER_FAILED:
3062                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3063                 wake_up(&vhost->work_wait_q);
3064                 return;
3065         case IBMVFC_MAD_FAILED:
3066         default:
3067                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3068                 break;
3069         };
3070
3071         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3072                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3073         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3074                  tgt->scsi_id != tgt->new_scsi_id)
3075                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3076         kref_put(&tgt->kref, ibmvfc_release_tgt);
3077         wake_up(&vhost->work_wait_q);
3078 }
3079
3080 /**
3081  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3082  * @tgt:                ibmvfc target struct
3083  *
3084  **/
3085 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3086 {
3087         struct ibmvfc_implicit_logout *mad;
3088         struct ibmvfc_host *vhost = tgt->vhost;
3089         struct ibmvfc_event *evt;
3090
3091         if (vhost->discovery_threads >= disc_threads)
3092                 return;
3093
3094         kref_get(&tgt->kref);
3095         evt = ibmvfc_get_event(vhost);
3096         vhost->discovery_threads++;
3097         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3098         evt->tgt = tgt;
3099         mad = &evt->iu.implicit_logout;
3100         memset(mad, 0, sizeof(*mad));
3101         mad->common.version = 1;
3102         mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
3103         mad->common.length = sizeof(*mad);
3104         mad->old_scsi_id = tgt->scsi_id;
3105
3106         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3107         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3108                 vhost->discovery_threads--;
3109                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3110                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3111         } else
3112                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3113 }
3114
3115 /**
3116  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3117  * @mad:        ibmvfc passthru mad struct
3118  * @tgt:        ibmvfc target struct
3119  *
3120  * Returns:
3121  *      1 if PLOGI needed / 0 if PLOGI not needed
3122  **/
3123 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3124                                     struct ibmvfc_target *tgt)
3125 {
3126         if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3127                    sizeof(tgt->ids.port_name)))
3128                 return 1;
3129         if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3130                    sizeof(tgt->ids.node_name)))
3131                 return 1;
3132         if (mad->fc_iu.response[6] != tgt->scsi_id)
3133                 return 1;
3134         return 0;
3135 }
3136
3137 /**
3138  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3139  * @evt:        ibmvfc event struct
3140  *
3141  **/
3142 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3143 {
3144         struct ibmvfc_target *tgt = evt->tgt;
3145         struct ibmvfc_host *vhost = evt->vhost;
3146         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3147         u32 status = mad->common.status;
3148         u8 fc_reason, fc_explain;
3149
3150         vhost->discovery_threads--;
3151         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3152         del_timer(&tgt->timer);
3153
3154         switch (status) {
3155         case IBMVFC_MAD_SUCCESS:
3156                 tgt_dbg(tgt, "ADISC succeeded\n");
3157                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3158                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3159                 break;
3160         case IBMVFC_MAD_DRIVER_FAILED:
3161                 break;
3162         case IBMVFC_MAD_FAILED:
3163         default:
3164                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3165                 fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16;
3166                 fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8;
3167                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3168                          ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error),
3169                          mad->iu.status, mad->iu.error,
3170                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3171                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3172                 break;
3173         };
3174
3175         kref_put(&tgt->kref, ibmvfc_release_tgt);
3176         ibmvfc_free_event(evt);
3177         wake_up(&vhost->work_wait_q);
3178 }
3179
3180 /**
3181  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3182  * @evt:                ibmvfc event struct
3183  *
3184  **/
3185 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3186 {
3187         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3188
3189         memset(mad, 0, sizeof(*mad));
3190         mad->common.version = 1;
3191         mad->common.opcode = IBMVFC_PASSTHRU;
3192         mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
3193         mad->cmd_ioba.va = (u64)evt->crq.ioba +
3194                 offsetof(struct ibmvfc_passthru_mad, iu);
3195         mad->cmd_ioba.len = sizeof(mad->iu);
3196         mad->iu.cmd_len = sizeof(mad->fc_iu.payload);
3197         mad->iu.rsp_len = sizeof(mad->fc_iu.response);
3198         mad->iu.cmd.va = (u64)evt->crq.ioba +
3199                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3200                 offsetof(struct ibmvfc_passthru_fc_iu, payload);
3201         mad->iu.cmd.len = sizeof(mad->fc_iu.payload);
3202         mad->iu.rsp.va = (u64)evt->crq.ioba +
3203                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3204                 offsetof(struct ibmvfc_passthru_fc_iu, response);
3205         mad->iu.rsp.len = sizeof(mad->fc_iu.response);
3206 }
3207
3208 /**
3209  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3210  * @evt:                ibmvfc event struct
3211  *
3212  * Just cleanup this event struct. Everything else is handled by
3213  * the ADISC completion handler. If the ADISC never actually comes
3214  * back, we still have the timer running on the ADISC event struct
3215  * which will fire and cause the CRQ to get reset.
3216  *
3217  **/
3218 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3219 {
3220         struct ibmvfc_host *vhost = evt->vhost;
3221         struct ibmvfc_target *tgt = evt->tgt;
3222
3223         tgt_dbg(tgt, "ADISC cancel complete\n");
3224         vhost->abort_threads--;
3225         ibmvfc_free_event(evt);
3226         kref_put(&tgt->kref, ibmvfc_release_tgt);
3227         wake_up(&vhost->work_wait_q);
3228 }
3229
3230 /**
3231  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3232  * @tgt:                ibmvfc target struct
3233  *
3234  * If an ADISC times out, send a cancel. If the cancel times
3235  * out, reset the CRQ. When the ADISC comes back as cancelled,
3236  * log back into the target.
3237  **/
3238 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3239 {
3240         struct ibmvfc_host *vhost = tgt->vhost;
3241         struct ibmvfc_event *evt;
3242         struct ibmvfc_tmf *tmf;
3243         unsigned long flags;
3244         int rc;
3245
3246         tgt_dbg(tgt, "ADISC timeout\n");
3247         spin_lock_irqsave(vhost->host->host_lock, flags);
3248         if (vhost->abort_threads >= disc_threads ||
3249             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3250             vhost->state != IBMVFC_INITIALIZING ||
3251             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3252                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3253                 return;
3254         }
3255
3256         vhost->abort_threads++;
3257         kref_get(&tgt->kref);
3258         evt = ibmvfc_get_event(vhost);
3259         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3260
3261         evt->tgt = tgt;
3262         tmf = &evt->iu.tmf;
3263         memset(tmf, 0, sizeof(*tmf));
3264         tmf->common.version = 1;
3265         tmf->common.opcode = IBMVFC_TMF_MAD;
3266         tmf->common.length = sizeof(*tmf);
3267         tmf->scsi_id = tgt->scsi_id;
3268         tmf->cancel_key = tgt->cancel_key;
3269
3270         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3271
3272         if (rc) {
3273                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3274                 vhost->abort_threads--;
3275                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3276                 __ibmvfc_reset_host(vhost);
3277         } else
3278                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3279         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3280 }
3281
3282 /**
3283  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3284  * @tgt:                ibmvfc target struct
3285  *
3286  * When sending an ADISC we end up with two timers running. The
3287  * first timer is the timer in the ibmvfc target struct. If this
3288  * fires, we send a cancel to the target. The second timer is the
3289  * timer on the ibmvfc event for the ADISC, which is longer. If that
3290  * fires, it means the ADISC timed out and our attempt to cancel it
3291  * also failed, so we need to reset the CRQ.
3292  **/
3293 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3294 {
3295         struct ibmvfc_passthru_mad *mad;
3296         struct ibmvfc_host *vhost = tgt->vhost;
3297         struct ibmvfc_event *evt;
3298
3299         if (vhost->discovery_threads >= disc_threads)
3300                 return;
3301
3302         kref_get(&tgt->kref);
3303         evt = ibmvfc_get_event(vhost);
3304         vhost->discovery_threads++;
3305         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3306         evt->tgt = tgt;
3307
3308         ibmvfc_init_passthru(evt);
3309         mad = &evt->iu.passthru;
3310         mad->iu.flags = IBMVFC_FC_ELS;
3311         mad->iu.scsi_id = tgt->scsi_id;
3312         mad->iu.cancel_key = tgt->cancel_key;
3313
3314         mad->fc_iu.payload[0] = IBMVFC_ADISC;
3315         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3316                sizeof(vhost->login_buf->resp.port_name));
3317         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3318                sizeof(vhost->login_buf->resp.node_name));
3319         mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
3320
3321         if (timer_pending(&tgt->timer))
3322                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3323         else {
3324                 tgt->timer.data = (unsigned long) tgt;
3325                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3326                 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3327                 add_timer(&tgt->timer);
3328         }
3329
3330         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3331         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3332                 vhost->discovery_threads--;
3333                 del_timer(&tgt->timer);
3334                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3335                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3336         } else
3337                 tgt_dbg(tgt, "Sent ADISC\n");
3338 }
3339
3340 /**
3341  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3342  * @evt:        ibmvfc event struct
3343  *
3344  **/
3345 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3346 {
3347         struct ibmvfc_target *tgt = evt->tgt;
3348         struct ibmvfc_host *vhost = evt->vhost;
3349         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3350         u32 status = rsp->common.status;
3351         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3352
3353         vhost->discovery_threads--;
3354         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3355         switch (status) {
3356         case IBMVFC_MAD_SUCCESS:
3357                 tgt_dbg(tgt, "Query Target succeeded\n");
3358                 tgt->new_scsi_id = rsp->scsi_id;
3359                 if (rsp->scsi_id != tgt->scsi_id)
3360                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3361                 else
3362                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3363                 break;
3364         case IBMVFC_MAD_DRIVER_FAILED:
3365                 break;
3366         case IBMVFC_MAD_CRQ_ERROR:
3367                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3368                 break;
3369         case IBMVFC_MAD_FAILED:
3370         default:
3371                 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3372                     rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3373                     rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
3374                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3375                 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3376                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3377                 else
3378                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3379
3380                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3381                         ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3382                         ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3383                         ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
3384                 break;
3385         };
3386
3387         kref_put(&tgt->kref, ibmvfc_release_tgt);
3388         ibmvfc_free_event(evt);
3389         wake_up(&vhost->work_wait_q);
3390 }
3391
3392 /**
3393  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3394  * @tgt:        ibmvfc target struct
3395  *
3396  **/
3397 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3398 {
3399         struct ibmvfc_query_tgt *query_tgt;
3400         struct ibmvfc_host *vhost = tgt->vhost;
3401         struct ibmvfc_event *evt;
3402
3403         if (vhost->discovery_threads >= disc_threads)
3404                 return;
3405
3406         kref_get(&tgt->kref);
3407         evt = ibmvfc_get_event(vhost);
3408         vhost->discovery_threads++;
3409         evt->tgt = tgt;
3410         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3411         query_tgt = &evt->iu.query_tgt;
3412         memset(query_tgt, 0, sizeof(*query_tgt));
3413         query_tgt->common.version = 1;
3414         query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
3415         query_tgt->common.length = sizeof(*query_tgt);
3416         query_tgt->wwpn = tgt->ids.port_name;
3417
3418         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3419         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3420                 vhost->discovery_threads--;
3421                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3422                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3423         } else
3424                 tgt_dbg(tgt, "Sent Query Target\n");
3425 }
3426
3427 /**
3428  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3429  * @vhost:              ibmvfc host struct
3430  * @scsi_id:    SCSI ID to allocate target for
3431  *
3432  * Returns:
3433  *      0 on success / other on failure
3434  **/
3435 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3436 {
3437         struct ibmvfc_target *tgt;
3438         unsigned long flags;
3439
3440         spin_lock_irqsave(vhost->host->host_lock, flags);
3441         list_for_each_entry(tgt, &vhost->targets, queue) {
3442                 if (tgt->scsi_id == scsi_id) {
3443                         if (tgt->need_login)
3444                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3445                         goto unlock_out;
3446                 }
3447         }
3448         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3449
3450         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3451         if (!tgt) {
3452                 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3453                         scsi_id);
3454                 return -ENOMEM;
3455         }
3456
3457         memset(tgt, 0, sizeof(*tgt));
3458         tgt->scsi_id = scsi_id;
3459         tgt->new_scsi_id = scsi_id;
3460         tgt->vhost = vhost;
3461         tgt->need_login = 1;
3462         tgt->cancel_key = vhost->task_set++;
3463         init_timer(&tgt->timer);
3464         kref_init(&tgt->kref);
3465         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3466         spin_lock_irqsave(vhost->host->host_lock, flags);
3467         list_add_tail(&tgt->queue, &vhost->targets);
3468
3469 unlock_out:
3470         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3471         return 0;
3472 }
3473
3474 /**
3475  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3476  * @vhost:              ibmvfc host struct
3477  *
3478  * Returns:
3479  *      0 on success / other on failure
3480  **/
3481 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3482 {
3483         int i, rc;
3484
3485         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3486                 rc = ibmvfc_alloc_target(vhost,
3487                                          vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
3488
3489         return rc;
3490 }
3491
3492 /**
3493  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3494  * @evt:        ibmvfc event struct
3495  *
3496  **/
3497 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3498 {
3499         struct ibmvfc_host *vhost = evt->vhost;
3500         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3501         u32 mad_status = rsp->common.status;
3502         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3503
3504         switch (mad_status) {
3505         case IBMVFC_MAD_SUCCESS:
3506                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3507                 vhost->num_targets = rsp->num_written;
3508                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3509                 break;
3510         case IBMVFC_MAD_FAILED:
3511                 level += ibmvfc_retry_host_init(vhost);
3512                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3513                            ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3514                 break;
3515         case IBMVFC_MAD_DRIVER_FAILED:
3516                 break;
3517         default:
3518                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3519                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3520                 break;
3521         }
3522
3523         ibmvfc_free_event(evt);
3524         wake_up(&vhost->work_wait_q);
3525 }
3526
3527 /**
3528  * ibmvfc_discover_targets - Send Discover Targets MAD
3529  * @vhost:      ibmvfc host struct
3530  *
3531  **/
3532 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3533 {
3534         struct ibmvfc_discover_targets *mad;
3535         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3536
3537         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3538         mad = &evt->iu.discover_targets;
3539         memset(mad, 0, sizeof(*mad));
3540         mad->common.version = 1;
3541         mad->common.opcode = IBMVFC_DISC_TARGETS;
3542         mad->common.length = sizeof(*mad);
3543         mad->bufflen = vhost->disc_buf_sz;
3544         mad->buffer.va = vhost->disc_buf_dma;
3545         mad->buffer.len = vhost->disc_buf_sz;
3546         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3547
3548         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3549                 ibmvfc_dbg(vhost, "Sent discover targets\n");
3550         else
3551                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3552 }
3553
3554 /**
3555  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
3556  * @evt:        ibmvfc event struct
3557  *
3558  **/
3559 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
3560 {
3561         struct ibmvfc_host *vhost = evt->vhost;
3562         u32 mad_status = evt->xfer_iu->npiv_login.common.status;
3563         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
3564         unsigned int npiv_max_sectors;
3565         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3566
3567         switch (mad_status) {
3568         case IBMVFC_MAD_SUCCESS:
3569                 ibmvfc_free_event(evt);
3570                 break;
3571         case IBMVFC_MAD_FAILED:
3572                 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3573                         level += ibmvfc_retry_host_init(vhost);
3574                 else
3575                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3576                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
3577                            ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3578                 ibmvfc_free_event(evt);
3579                 return;
3580         case IBMVFC_MAD_CRQ_ERROR:
3581                 ibmvfc_retry_host_init(vhost);
3582         case IBMVFC_MAD_DRIVER_FAILED:
3583                 ibmvfc_free_event(evt);
3584                 return;
3585         default:
3586                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
3587                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3588                 ibmvfc_free_event(evt);
3589                 return;
3590         }
3591
3592         vhost->client_migrated = 0;
3593
3594         if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
3595                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
3596                         rsp->flags);
3597                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3598                 wake_up(&vhost->work_wait_q);
3599                 return;
3600         }
3601
3602         if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
3603                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
3604                         rsp->max_cmds);
3605                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3606                 wake_up(&vhost->work_wait_q);
3607                 return;
3608         }
3609
3610         vhost->logged_in = 1;
3611         npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
3612         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
3613                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
3614                  rsp->drc_name, npiv_max_sectors);
3615
3616         fc_host_fabric_name(vhost->host) = rsp->node_name;
3617         fc_host_node_name(vhost->host) = rsp->node_name;
3618         fc_host_port_name(vhost->host) = rsp->port_name;
3619         fc_host_port_id(vhost->host) = rsp->scsi_id;
3620         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
3621         fc_host_supported_classes(vhost->host) = 0;
3622         if (rsp->service_parms.class1_parms[0] & 0x80000000)
3623                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
3624         if (rsp->service_parms.class2_parms[0] & 0x80000000)
3625                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
3626         if (rsp->service_parms.class3_parms[0] & 0x80000000)
3627                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
3628         fc_host_maxframe_size(vhost->host) =
3629                 rsp->service_parms.common.bb_rcv_sz & 0x0fff;
3630
3631         vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
3632         vhost->host->max_sectors = npiv_max_sectors;
3633         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
3634         wake_up(&vhost->work_wait_q);
3635 }
3636
3637 /**
3638  * ibmvfc_npiv_login - Sends NPIV login
3639  * @vhost:      ibmvfc host struct
3640  *
3641  **/
3642 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
3643 {
3644         struct ibmvfc_npiv_login_mad *mad;
3645         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3646
3647         ibmvfc_gather_partition_info(vhost);
3648         ibmvfc_set_login_info(vhost);
3649         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
3650
3651         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
3652         mad = &evt->iu.npiv_login;
3653         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
3654         mad->common.version = 1;
3655         mad->common.opcode = IBMVFC_NPIV_LOGIN;
3656         mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
3657         mad->buffer.va = vhost->login_buf_dma;
3658         mad->buffer.len = sizeof(*vhost->login_buf);
3659
3660         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3661
3662         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3663                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
3664         else
3665                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3666 };
3667
3668 /**
3669  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
3670  * @vhost:              ibmvfc host struct
3671  *
3672  **/
3673 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
3674 {
3675         struct ibmvfc_host *vhost = evt->vhost;
3676         u32 mad_status = evt->xfer_iu->npiv_logout.common.status;
3677
3678         ibmvfc_free_event(evt);
3679
3680         switch (mad_status) {
3681         case IBMVFC_MAD_SUCCESS:
3682                 if (list_empty(&vhost->sent) &&
3683                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
3684                         ibmvfc_init_host(vhost, 0);
3685                         return;
3686                 }
3687                 break;
3688         case IBMVFC_MAD_FAILED:
3689         case IBMVFC_MAD_NOT_SUPPORTED:
3690         case IBMVFC_MAD_CRQ_ERROR:
3691         case IBMVFC_MAD_DRIVER_FAILED:
3692         default:
3693                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
3694                 break;
3695         }
3696
3697         ibmvfc_hard_reset_host(vhost);
3698 }
3699
3700 /**
3701  * ibmvfc_npiv_logout - Issue an NPIV Logout
3702  * @vhost:              ibmvfc host struct
3703  *
3704  **/
3705 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
3706 {
3707         struct ibmvfc_npiv_logout_mad *mad;
3708         struct ibmvfc_event *evt;
3709
3710         evt = ibmvfc_get_event(vhost);
3711         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
3712
3713         mad = &evt->iu.npiv_logout;
3714         memset(mad, 0, sizeof(*mad));
3715         mad->common.version = 1;
3716         mad->common.opcode = IBMVFC_NPIV_LOGOUT;
3717         mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);
3718
3719         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
3720
3721         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3722                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
3723         else
3724                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3725 }
3726
3727 /**
3728  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
3729  * @vhost:              ibmvfc host struct
3730  *
3731  * Returns:
3732  *      1 if work to do / 0 if not
3733  **/
3734 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
3735 {
3736         struct ibmvfc_target *tgt;
3737
3738         list_for_each_entry(tgt, &vhost->targets, queue) {
3739                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
3740                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
3741                         return 1;
3742         }
3743
3744         return 0;
3745 }
3746
3747 /**
3748  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
3749  * @vhost:              ibmvfc host struct
3750  *
3751  * Returns:
3752  *      1 if work to do / 0 if not
3753  **/
3754 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
3755 {
3756         struct ibmvfc_target *tgt;
3757
3758         if (kthread_should_stop())
3759                 return 1;
3760         switch (vhost->action) {
3761         case IBMVFC_HOST_ACTION_NONE:
3762         case IBMVFC_HOST_ACTION_INIT_WAIT:
3763         case IBMVFC_HOST_ACTION_LOGO_WAIT:
3764                 return 0;
3765         case IBMVFC_HOST_ACTION_TGT_INIT:
3766         case IBMVFC_HOST_ACTION_QUERY_TGTS:
3767                 if (vhost->discovery_threads == disc_threads)
3768                         return 0;
3769                 list_for_each_entry(tgt, &vhost->targets, queue)
3770                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
3771                                 return 1;
3772                 list_for_each_entry(tgt, &vhost->targets, queue)
3773                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
3774                                 return 0;
3775                 return 1;
3776         case IBMVFC_HOST_ACTION_LOGO:
3777         case IBMVFC_HOST_ACTION_INIT:
3778         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
3779         case IBMVFC_HOST_ACTION_TGT_DEL:
3780         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
3781         case IBMVFC_HOST_ACTION_QUERY:
3782         default:
3783                 break;
3784         };
3785
3786         return 1;
3787 }
3788
3789 /**
3790  * ibmvfc_work_to_do - Is there task level work to do?
3791  * @vhost:              ibmvfc host struct
3792  *
3793  * Returns:
3794  *      1 if work to do / 0 if not
3795  **/
3796 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
3797 {
3798         unsigned long flags;
3799         int rc;
3800
3801         spin_lock_irqsave(vhost->host->host_lock, flags);
3802         rc = __ibmvfc_work_to_do(vhost);
3803         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3804         return rc;
3805 }
3806
3807 /**
3808  * ibmvfc_log_ae - Log async events if necessary
3809  * @vhost:              ibmvfc host struct
3810  * @events:             events to log
3811  *
3812  **/
3813 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
3814 {
3815         if (events & IBMVFC_AE_RSCN)
3816                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
3817         if ((events & IBMVFC_AE_LINKDOWN) &&
3818             vhost->state >= IBMVFC_HALTED)
3819                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
3820         if ((events & IBMVFC_AE_LINKUP) &&
3821             vhost->state == IBMVFC_INITIALIZING)
3822                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
3823 }
3824
3825 /**
3826  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
3827  * @tgt:                ibmvfc target struct
3828  *
3829  **/
3830 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
3831 {
3832         struct ibmvfc_host *vhost = tgt->vhost;
3833         struct fc_rport *rport;
3834         unsigned long flags;
3835
3836         tgt_dbg(tgt, "Adding rport\n");
3837         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
3838         spin_lock_irqsave(vhost->host->host_lock, flags);
3839
3840         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
3841                 tgt_dbg(tgt, "Deleting rport\n");
3842                 list_del(&tgt->queue);
3843                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3844                 fc_remote_port_delete(rport);
3845                 del_timer_sync(&tgt->timer);
3846                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3847                 return;
3848         }
3849
3850         if (rport) {
3851                 tgt_dbg(tgt, "rport add succeeded\n");
3852                 tgt->rport = rport;
3853                 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
3854                 rport->supported_classes = 0;
3855                 tgt->target_id = rport->scsi_target_id;
3856                 if (tgt->service_parms.class1_parms[0] & 0x80000000)
3857                         rport->supported_classes |= FC_COS_CLASS1;
3858                 if (tgt->service_parms.class2_parms[0] & 0x80000000)
3859                         rport->supported_classes |= FC_COS_CLASS2;
3860                 if (tgt->service_parms.class3_parms[0] & 0x80000000)
3861                         rport->supported_classes |= FC_COS_CLASS3;
3862         } else
3863                 tgt_dbg(tgt, "rport add failed\n");
3864         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3865 }
3866
3867 /**
3868  * ibmvfc_do_work - Do task level work
3869  * @vhost:              ibmvfc host struct
3870  *
3871  **/
3872 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
3873 {
3874         struct ibmvfc_target *tgt;
3875         unsigned long flags;
3876         struct fc_rport *rport;
3877
3878         ibmvfc_log_ae(vhost, vhost->events_to_log);
3879         spin_lock_irqsave(vhost->host->host_lock, flags);
3880         vhost->events_to_log = 0;
3881         switch (vhost->action) {
3882         case IBMVFC_HOST_ACTION_NONE:
3883         case IBMVFC_HOST_ACTION_LOGO_WAIT:
3884         case IBMVFC_HOST_ACTION_INIT_WAIT:
3885                 break;
3886         case IBMVFC_HOST_ACTION_LOGO:
3887                 vhost->job_step(vhost);
3888                 break;
3889         case IBMVFC_HOST_ACTION_INIT:
3890                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
3891                 if (vhost->delay_init) {
3892                         vhost->delay_init = 0;
3893                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3894                         ssleep(15);
3895                         return;
3896                 } else
3897                         vhost->job_step(vhost);
3898                 break;
3899         case IBMVFC_HOST_ACTION_QUERY:
3900                 list_for_each_entry(tgt, &vhost->targets, queue)
3901                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
3902                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
3903                 break;
3904         case IBMVFC_HOST_ACTION_QUERY_TGTS:
3905                 list_for_each_entry(tgt, &vhost->targets, queue) {
3906                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
3907                                 tgt->job_step(tgt);
3908                                 break;
3909                         }
3910                 }
3911
3912                 if (!ibmvfc_dev_init_to_do(vhost))
3913                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
3914                 break;
3915         case IBMVFC_HOST_ACTION_TGT_DEL:
3916         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
3917                 list_for_each_entry(tgt, &vhost->targets, queue) {
3918                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
3919                                 tgt_dbg(tgt, "Deleting rport\n");
3920                                 rport = tgt->rport;
3921                                 tgt->rport = NULL;
3922                                 list_del(&tgt->queue);
3923                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3924                                 if (rport)
3925                                         fc_remote_port_delete(rport);
3926                                 del_timer_sync(&tgt->timer);
3927                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3928                                 return;
3929                         }
3930                 }
3931
3932                 if (vhost->state == IBMVFC_INITIALIZING) {
3933                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
3934                                 if (vhost->reinit) {
3935                                         vhost->reinit = 0;
3936                                         scsi_block_requests(vhost->host);
3937                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
3938                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3939                                 } else {
3940                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
3941                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3942                                         wake_up(&vhost->init_wait_q);
3943                                         schedule_work(&vhost->rport_add_work_q);
3944                                         vhost->init_retries = 0;
3945                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3946                                         scsi_unblock_requests(vhost->host);
3947                                 }
3948
3949                                 return;
3950                         } else {
3951                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
3952                                 vhost->job_step = ibmvfc_discover_targets;
3953                         }
3954                 } else {
3955                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3956                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3957                         scsi_unblock_requests(vhost->host);
3958                         wake_up(&vhost->init_wait_q);
3959                         return;
3960                 }
3961                 break;
3962         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
3963                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
3964                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3965                 ibmvfc_alloc_targets(vhost);
3966                 spin_lock_irqsave(vhost->host->host_lock, flags);
3967                 break;
3968         case IBMVFC_HOST_ACTION_TGT_INIT:
3969                 list_for_each_entry(tgt, &vhost->targets, queue) {
3970                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
3971                                 tgt->job_step(tgt);
3972                                 break;
3973                         }
3974                 }
3975
3976                 if (!ibmvfc_dev_init_to_do(vhost))
3977                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
3978                 break;
3979         default:
3980                 break;
3981         };
3982
3983         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3984 }
3985
3986 /**
3987  * ibmvfc_work - Do task level work
3988  * @data:               ibmvfc host struct
3989  *
3990  * Returns:
3991  *      zero
3992  **/
3993 static int ibmvfc_work(void *data)
3994 {
3995         struct ibmvfc_host *vhost = data;
3996         int rc;
3997
3998         set_user_nice(current, -20);
3999
4000         while (1) {
4001                 rc = wait_event_interruptible(vhost->work_wait_q,
4002                                               ibmvfc_work_to_do(vhost));
4003
4004                 BUG_ON(rc);
4005
4006                 if (kthread_should_stop())
4007                         break;
4008
4009                 ibmvfc_do_work(vhost);
4010         }
4011
4012         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4013         return 0;
4014 }
4015
4016 /**
4017  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4018  * @vhost:      ibmvfc host struct
4019  *
4020  * Allocates a page for messages, maps it for dma, and registers
4021  * the crq with the hypervisor.
4022  *
4023  * Return value:
4024  *      zero on success / other on failure
4025  **/
4026 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4027 {
4028         int rc, retrc = -ENOMEM;
4029         struct device *dev = vhost->dev;
4030         struct vio_dev *vdev = to_vio_dev(dev);
4031         struct ibmvfc_crq_queue *crq = &vhost->crq;
4032
4033         ENTER;
4034         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4035
4036         if (!crq->msgs)
4037                 return -ENOMEM;
4038
4039         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4040         crq->msg_token = dma_map_single(dev, crq->msgs,
4041                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4042
4043         if (dma_mapping_error(dev, crq->msg_token))
4044                 goto map_failed;
4045
4046         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4047                                         crq->msg_token, PAGE_SIZE);
4048
4049         if (rc == H_RESOURCE)
4050                 /* maybe kexecing and resource is busy. try a reset */
4051                 retrc = rc = ibmvfc_reset_crq(vhost);
4052
4053         if (rc == H_CLOSED)
4054                 dev_warn(dev, "Partner adapter not ready\n");
4055         else if (rc) {
4056                 dev_warn(dev, "Error %d opening adapter\n", rc);
4057                 goto reg_crq_failed;
4058         }
4059
4060         retrc = 0;
4061
4062         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4063
4064         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4065                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4066                 goto req_irq_failed;
4067         }
4068
4069         if ((rc = vio_enable_interrupts(vdev))) {
4070                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4071                 goto req_irq_failed;
4072         }
4073
4074         crq->cur = 0;
4075         LEAVE;
4076         return retrc;
4077
4078 req_irq_failed:
4079         tasklet_kill(&vhost->tasklet);
4080         do {
4081                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4082         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4083 reg_crq_failed:
4084         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4085 map_failed:
4086         free_page((unsigned long)crq->msgs);
4087         return retrc;
4088 }
4089
4090 /**
4091  * ibmvfc_free_mem - Free memory for vhost
4092  * @vhost:      ibmvfc host struct
4093  *
4094  * Return value:
4095  *      none
4096  **/
4097 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4098 {
4099         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4100
4101         ENTER;
4102         mempool_destroy(vhost->tgt_pool);
4103         kfree(vhost->trace);
4104         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4105                           vhost->disc_buf_dma);
4106         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4107                           vhost->login_buf, vhost->login_buf_dma);
4108         dma_pool_destroy(vhost->sg_pool);
4109         dma_unmap_single(vhost->dev, async_q->msg_token,
4110                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4111         free_page((unsigned long)async_q->msgs);
4112         LEAVE;
4113 }
4114
4115 /**
4116  * ibmvfc_alloc_mem - Allocate memory for vhost
4117  * @vhost:      ibmvfc host struct
4118  *
4119  * Return value:
4120  *      0 on success / non-zero on failure
4121  **/
4122 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4123 {
4124         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4125         struct device *dev = vhost->dev;
4126
4127         ENTER;
4128         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4129         if (!async_q->msgs) {
4130                 dev_err(dev, "Couldn't allocate async queue.\n");
4131                 goto nomem;
4132         }
4133
4134         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4135         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4136                                             async_q->size * sizeof(*async_q->msgs),
4137                                             DMA_BIDIRECTIONAL);
4138
4139         if (dma_mapping_error(dev, async_q->msg_token)) {
4140                 dev_err(dev, "Failed to map async queue\n");
4141                 goto free_async_crq;
4142         }
4143
4144         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4145                                          SG_ALL * sizeof(struct srp_direct_buf),
4146                                          sizeof(struct srp_direct_buf), 0);
4147
4148         if (!vhost->sg_pool) {
4149                 dev_err(dev, "Failed to allocate sg pool\n");
4150                 goto unmap_async_crq;
4151         }
4152
4153         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4154                                               &vhost->login_buf_dma, GFP_KERNEL);
4155
4156         if (!vhost->login_buf) {
4157                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4158                 goto free_sg_pool;
4159         }
4160
4161         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4162         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4163                                              &vhost->disc_buf_dma, GFP_KERNEL);
4164
4165         if (!vhost->disc_buf) {
4166                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4167                 goto free_login_buffer;
4168         }
4169
4170         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4171                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4172
4173         if (!vhost->trace)
4174                 goto free_disc_buffer;
4175
4176         vhost->tgt_pool = mempool_create_kzalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4177                                                       sizeof(struct ibmvfc_target));
4178
4179         if (!vhost->tgt_pool) {
4180                 dev_err(dev, "Couldn't allocate target memory pool\n");
4181                 goto free_trace;
4182         }
4183
4184         LEAVE;
4185         return 0;
4186
4187 free_trace:
4188         kfree(vhost->trace);
4189 free_disc_buffer:
4190         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4191                           vhost->disc_buf_dma);
4192 free_login_buffer:
4193         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4194                           vhost->login_buf, vhost->login_buf_dma);
4195 free_sg_pool:
4196         dma_pool_destroy(vhost->sg_pool);
4197 unmap_async_crq:
4198         dma_unmap_single(dev, async_q->msg_token,
4199                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4200 free_async_crq:
4201         free_page((unsigned long)async_q->msgs);
4202 nomem:
4203         LEAVE;
4204         return -ENOMEM;
4205 }
4206
4207 /**
4208  * ibmvfc_rport_add_thread - Worker thread for rport adds
4209  * @work:       work struct
4210  *
4211  **/
4212 static void ibmvfc_rport_add_thread(struct work_struct *work)
4213 {
4214         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4215                                                  rport_add_work_q);
4216         struct ibmvfc_target *tgt;
4217         struct fc_rport *rport;
4218         unsigned long flags;
4219         int did_work;
4220
4221         ENTER;
4222         spin_lock_irqsave(vhost->host->host_lock, flags);
4223         do {
4224                 did_work = 0;
4225                 if (vhost->state != IBMVFC_ACTIVE)
4226                         break;
4227
4228                 list_for_each_entry(tgt, &vhost->targets, queue) {
4229                         if (tgt->add_rport) {
4230                                 did_work = 1;
4231                                 tgt->add_rport = 0;
4232                                 kref_get(&tgt->kref);
4233                                 rport = tgt->rport;
4234                                 if (!rport) {
4235                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4236                                         ibmvfc_tgt_add_rport(tgt);
4237                                 } else if (get_device(&rport->dev)) {
4238                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4239                                         tgt_dbg(tgt, "Setting rport roles\n");
4240                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4241                                         put_device(&rport->dev);
4242                                 }
4243
4244                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4245                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4246                                 break;
4247                         }
4248                 }
4249         } while(did_work);
4250
4251         if (vhost->state == IBMVFC_ACTIVE)
4252                 vhost->scan_complete = 1;
4253         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4254         LEAVE;
4255 }
4256
4257 /**
4258  * ibmvfc_probe - Adapter hot plug add entry point
4259  * @vdev:       vio device struct
4260  * @id: vio device id struct
4261  *
4262  * Return value:
4263  *      0 on success / non-zero on failure
4264  **/
4265 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4266 {
4267         struct ibmvfc_host *vhost;
4268         struct Scsi_Host *shost;
4269         struct device *dev = &vdev->dev;
4270         int rc = -ENOMEM;
4271
4272         ENTER;
4273         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4274         if (!shost) {
4275                 dev_err(dev, "Couldn't allocate host data\n");
4276                 goto out;
4277         }
4278
4279         shost->transportt = ibmvfc_transport_template;
4280         shost->can_queue = max_requests;
4281         shost->max_lun = max_lun;
4282         shost->max_id = max_targets;
4283         shost->max_sectors = IBMVFC_MAX_SECTORS;
4284         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4285         shost->unique_id = shost->host_no;
4286
4287         vhost = shost_priv(shost);
4288         INIT_LIST_HEAD(&vhost->sent);
4289         INIT_LIST_HEAD(&vhost->free);
4290         INIT_LIST_HEAD(&vhost->targets);
4291         sprintf(vhost->name, IBMVFC_NAME);
4292         vhost->host = shost;
4293         vhost->dev = dev;
4294         vhost->partition_number = -1;
4295         vhost->log_level = log_level;
4296         vhost->task_set = 1;
4297         strcpy(vhost->partition_name, "UNKNOWN");
4298         init_waitqueue_head(&vhost->work_wait_q);
4299         init_waitqueue_head(&vhost->init_wait_q);
4300         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4301
4302         if ((rc = ibmvfc_alloc_mem(vhost)))
4303                 goto free_scsi_host;
4304
4305         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4306                                          shost->host_no);
4307
4308         if (IS_ERR(vhost->work_thread)) {
4309                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4310                         PTR_ERR(vhost->work_thread));
4311                 goto free_host_mem;
4312         }
4313
4314         if ((rc = ibmvfc_init_crq(vhost))) {
4315                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4316                 goto kill_kthread;
4317         }
4318
4319         if ((rc = ibmvfc_init_event_pool(vhost))) {
4320                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4321                 goto release_crq;
4322         }
4323
4324         if ((rc = scsi_add_host(shost, dev)))
4325                 goto release_event_pool;
4326
4327         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4328                                            &ibmvfc_trace_attr))) {
4329                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4330                 goto remove_shost;
4331         }
4332
4333         dev_set_drvdata(dev, vhost);
4334         spin_lock(&ibmvfc_driver_lock);
4335         list_add_tail(&vhost->queue, &ibmvfc_head);
4336         spin_unlock(&ibmvfc_driver_lock);
4337
4338         ibmvfc_send_crq_init(vhost);
4339         scsi_scan_host(shost);
4340         return 0;
4341
4342 remove_shost:
4343         scsi_remove_host(shost);
4344 release_event_pool:
4345         ibmvfc_free_event_pool(vhost);
4346 release_crq:
4347         ibmvfc_release_crq_queue(vhost);
4348 kill_kthread:
4349         kthread_stop(vhost->work_thread);
4350 free_host_mem:
4351         ibmvfc_free_mem(vhost);
4352 free_scsi_host:
4353         scsi_host_put(shost);
4354 out:
4355         LEAVE;
4356         return rc;
4357 }
4358
4359 /**
4360  * ibmvfc_remove - Adapter hot plug remove entry point
4361  * @vdev:       vio device struct
4362  *
4363  * Return value:
4364  *      0
4365  **/
4366 static int ibmvfc_remove(struct vio_dev *vdev)
4367 {
4368         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4369         unsigned long flags;
4370
4371         ENTER;
4372         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4373         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4374         ibmvfc_wait_while_resetting(vhost);
4375         ibmvfc_release_crq_queue(vhost);
4376         kthread_stop(vhost->work_thread);
4377         fc_remove_host(vhost->host);
4378         scsi_remove_host(vhost->host);
4379
4380         spin_lock_irqsave(vhost->host->host_lock, flags);
4381         ibmvfc_purge_requests(vhost, DID_ERROR);
4382         ibmvfc_free_event_pool(vhost);
4383         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4384
4385         ibmvfc_free_mem(vhost);
4386         spin_lock(&ibmvfc_driver_lock);
4387         list_del(&vhost->queue);
4388         spin_unlock(&ibmvfc_driver_lock);
4389         scsi_host_put(vhost->host);
4390         LEAVE;
4391         return 0;
4392 }
4393
4394 /**
4395  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4396  * @vdev:       vio device struct
4397  *
4398  * Return value:
4399  *      Number of bytes the driver will need to DMA map at the same time in
4400  *      order to perform well.
4401  */
4402 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4403 {
4404         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4405         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4406 }
4407
4408 static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
4409         {"fcp", "IBM,vfc-client"},
4410         { "", "" }
4411 };
4412 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4413
4414 static struct vio_driver ibmvfc_driver = {
4415         .id_table = ibmvfc_device_table,
4416         .probe = ibmvfc_probe,
4417         .remove = ibmvfc_remove,
4418         .get_desired_dma = ibmvfc_get_desired_dma,
4419         .driver = {
4420                 .name = IBMVFC_NAME,
4421                 .owner = THIS_MODULE,
4422         }
4423 };
4424
4425 static struct fc_function_template ibmvfc_transport_functions = {
4426         .show_host_fabric_name = 1,
4427         .show_host_node_name = 1,
4428         .show_host_port_name = 1,
4429         .show_host_supported_classes = 1,
4430         .show_host_port_type = 1,
4431         .show_host_port_id = 1,
4432         .show_host_maxframe_size = 1,
4433
4434         .get_host_port_state = ibmvfc_get_host_port_state,
4435         .show_host_port_state = 1,
4436
4437         .get_host_speed = ibmvfc_get_host_speed,
4438         .show_host_speed = 1,
4439
4440         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4441         .terminate_rport_io = ibmvfc_terminate_rport_io,
4442
4443         .show_rport_maxframe_size = 1,
4444         .show_rport_supported_classes = 1,
4445
4446         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4447         .show_rport_dev_loss_tmo = 1,
4448
4449         .get_starget_node_name = ibmvfc_get_starget_node_name,
4450         .show_starget_node_name = 1,
4451
4452         .get_starget_port_name = ibmvfc_get_starget_port_name,
4453         .show_starget_port_name = 1,
4454
4455         .get_starget_port_id = ibmvfc_get_starget_port_id,
4456         .show_starget_port_id = 1,
4457 };
4458
4459 /**
4460  * ibmvfc_module_init - Initialize the ibmvfc module
4461  *
4462  * Return value:
4463  *      0 on success / other on failure
4464  **/
4465 static int __init ibmvfc_module_init(void)
4466 {
4467         int rc;
4468
4469         if (!firmware_has_feature(FW_FEATURE_VIO))
4470                 return -ENODEV;
4471
4472         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4473                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4474
4475         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4476         if (!ibmvfc_transport_template)
4477                 return -ENOMEM;
4478
4479         rc = vio_register_driver(&ibmvfc_driver);
4480         if (rc)
4481                 fc_release_transport(ibmvfc_transport_template);
4482         return rc;
4483 }
4484
4485 /**
4486  * ibmvfc_module_exit - Teardown the ibmvfc module
4487  *
4488  * Return value:
4489  *      nothing
4490  **/
4491 static void __exit ibmvfc_module_exit(void)
4492 {
4493         vio_unregister_driver(&ibmvfc_driver);
4494         fc_release_transport(ibmvfc_transport_template);
4495 }
4496
4497 module_init(ibmvfc_module_init);
4498 module_exit(ibmvfc_module_exit);