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_relogin - Log back into the specified device
1489  * @sdev:       scsi device struct
1490  *
1491  **/
1492 static void ibmvfc_relogin(struct scsi_device *sdev)
1493 {
1494         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1495         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1496         struct ibmvfc_target *tgt;
1497
1498         list_for_each_entry(tgt, &vhost->targets, queue) {
1499                 if (rport == tgt->rport) {
1500                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1501                         break;
1502                 }
1503         }
1504
1505         ibmvfc_reinit_host(vhost);
1506 }
1507
1508 /**
1509  * ibmvfc_scsi_done - Handle responses from commands
1510  * @evt:        ibmvfc event to be handled
1511  *
1512  * Used as a callback when sending scsi cmds.
1513  **/
1514 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1515 {
1516         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1517         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1518         struct scsi_cmnd *cmnd = evt->cmnd;
1519         u32 rsp_len = 0;
1520         u32 sense_len = rsp->fcp_sense_len;
1521
1522         if (cmnd) {
1523                 if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
1524                         scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
1525                 else if (rsp->flags & FCP_RESID_UNDER)
1526                         scsi_set_resid(cmnd, rsp->fcp_resid);
1527                 else
1528                         scsi_set_resid(cmnd, 0);
1529
1530                 if (vfc_cmd->status) {
1531                         cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1532
1533                         if (rsp->flags & FCP_RSP_LEN_VALID)
1534                                 rsp_len = rsp->fcp_rsp_len;
1535                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1536                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1537                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1538                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1539                         if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
1540                                 ibmvfc_relogin(cmnd->device);
1541
1542                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1543                                 cmnd->result = (DID_ERROR << 16);
1544
1545                         ibmvfc_log_error(evt);
1546                 }
1547
1548                 if (!cmnd->result &&
1549                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1550                         cmnd->result = (DID_ERROR << 16);
1551
1552                 scsi_dma_unmap(cmnd);
1553                 cmnd->scsi_done(cmnd);
1554         }
1555
1556         if (evt->eh_comp)
1557                 complete(evt->eh_comp);
1558
1559         ibmvfc_free_event(evt);
1560 }
1561
1562 /**
1563  * ibmvfc_host_chkready - Check if the host can accept commands
1564  * @vhost:       struct ibmvfc host
1565  *
1566  * Returns:
1567  *      1 if host can accept command / 0 if not
1568  **/
1569 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1570 {
1571         int result = 0;
1572
1573         switch (vhost->state) {
1574         case IBMVFC_LINK_DEAD:
1575         case IBMVFC_HOST_OFFLINE:
1576                 result = DID_NO_CONNECT << 16;
1577                 break;
1578         case IBMVFC_NO_CRQ:
1579         case IBMVFC_INITIALIZING:
1580         case IBMVFC_HALTED:
1581         case IBMVFC_LINK_DOWN:
1582                 result = DID_REQUEUE << 16;
1583                 break;
1584         case IBMVFC_ACTIVE:
1585                 result = 0;
1586                 break;
1587         };
1588
1589         return result;
1590 }
1591
1592 /**
1593  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1594  * @cmnd:       struct scsi_cmnd to be executed
1595  * @done:       Callback function to be called when cmnd is completed
1596  *
1597  * Returns:
1598  *      0 on success / other on failure
1599  **/
1600 static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
1601                                void (*done) (struct scsi_cmnd *))
1602 {
1603         struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1604         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1605         struct ibmvfc_cmd *vfc_cmd;
1606         struct ibmvfc_event *evt;
1607         u8 tag[2];
1608         int rc;
1609
1610         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1611             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1612                 cmnd->result = rc;
1613                 done(cmnd);
1614                 return 0;
1615         }
1616
1617         cmnd->result = (DID_OK << 16);
1618         evt = ibmvfc_get_event(vhost);
1619         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1620         evt->cmnd = cmnd;
1621         cmnd->scsi_done = done;
1622         vfc_cmd = &evt->iu.cmd;
1623         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1624         vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1625         vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
1626         vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
1627         vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
1628         vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
1629         vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
1630         vfc_cmd->tgt_scsi_id = rport->port_id;
1631         vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
1632         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1633         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1634
1635         if (scsi_populate_tag_msg(cmnd, tag)) {
1636                 vfc_cmd->task_tag = tag[1];
1637                 switch (tag[0]) {
1638                 case MSG_SIMPLE_TAG:
1639                         vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1640                         break;
1641                 case MSG_HEAD_TAG:
1642                         vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
1643                         break;
1644                 case MSG_ORDERED_TAG:
1645                         vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
1646                         break;
1647                 };
1648         }
1649
1650         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1651                 return ibmvfc_send_event(evt, vhost, 0);
1652
1653         ibmvfc_free_event(evt);
1654         if (rc == -ENOMEM)
1655                 return SCSI_MLQUEUE_HOST_BUSY;
1656
1657         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1658                 scmd_printk(KERN_ERR, cmnd,
1659                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1660
1661         cmnd->result = DID_ERROR << 16;
1662         done(cmnd);
1663         return 0;
1664 }
1665
1666 /**
1667  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1668  * @evt:        ibmvfc event struct
1669  *
1670  **/
1671 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1672 {
1673         /* copy the response back */
1674         if (evt->sync_iu)
1675                 *evt->sync_iu = *evt->xfer_iu;
1676
1677         complete(&evt->comp);
1678 }
1679
1680 /**
1681  * ibmvfc_reset_device - Reset the device with the specified reset type
1682  * @sdev:       scsi device to reset
1683  * @type:       reset type
1684  * @desc:       reset type description for log messages
1685  *
1686  * Returns:
1687  *      0 on success / other on failure
1688  **/
1689 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1690 {
1691         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1692         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1693         struct ibmvfc_cmd *tmf;
1694         struct ibmvfc_event *evt = NULL;
1695         union ibmvfc_iu rsp_iu;
1696         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1697         int rsp_rc = -EBUSY;
1698         unsigned long flags;
1699         int rsp_code = 0;
1700
1701         spin_lock_irqsave(vhost->host->host_lock, flags);
1702         if (vhost->state == IBMVFC_ACTIVE) {
1703                 evt = ibmvfc_get_event(vhost);
1704                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1705
1706                 tmf = &evt->iu.cmd;
1707                 memset(tmf, 0, sizeof(*tmf));
1708                 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1709                 tmf->resp.len = sizeof(tmf->rsp);
1710                 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1711                 tmf->payload_len = sizeof(tmf->iu);
1712                 tmf->resp_len = sizeof(tmf->rsp);
1713                 tmf->cancel_key = (unsigned long)sdev->hostdata;
1714                 tmf->tgt_scsi_id = rport->port_id;
1715                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1716                 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1717                 tmf->iu.tmf_flags = type;
1718                 evt->sync_iu = &rsp_iu;
1719
1720                 init_completion(&evt->comp);
1721                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1722         }
1723         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1724
1725         if (rsp_rc != 0) {
1726                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
1727                             desc, rsp_rc);
1728                 return -EIO;
1729         }
1730
1731         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
1732         wait_for_completion(&evt->comp);
1733
1734         if (rsp_iu.cmd.status) {
1735                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
1736                         rsp_code = fc_rsp->data.info.rsp_code;
1737
1738                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
1739                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
1740                             desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
1741                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
1742                             fc_rsp->scsi_status);
1743                 rsp_rc = -EIO;
1744         } else
1745                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
1746
1747         spin_lock_irqsave(vhost->host->host_lock, flags);
1748         ibmvfc_free_event(evt);
1749         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1750         return rsp_rc;
1751 }
1752
1753 /**
1754  * ibmvfc_abort_task_set - Abort outstanding commands to the device
1755  * @sdev:       scsi device to abort commands
1756  *
1757  * This sends an Abort Task Set to the VIOS for the specified device. This does
1758  * NOT send any cancel to the VIOS. That must be done separately.
1759  *
1760  * Returns:
1761  *      0 on success / other on failure
1762  **/
1763 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
1764 {
1765         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1766         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1767         struct ibmvfc_cmd *tmf;
1768         struct ibmvfc_event *evt, *found_evt;
1769         union ibmvfc_iu rsp_iu;
1770         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1771         int rsp_rc = -EBUSY;
1772         unsigned long flags;
1773         int rsp_code = 0;
1774
1775         spin_lock_irqsave(vhost->host->host_lock, flags);
1776         found_evt = NULL;
1777         list_for_each_entry(evt, &vhost->sent, queue) {
1778                 if (evt->cmnd && evt->cmnd->device == sdev) {
1779                         found_evt = evt;
1780                         break;
1781                 }
1782         }
1783
1784         if (!found_evt) {
1785                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1786                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
1787                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1788                 return 0;
1789         }
1790
1791         if (vhost->state == IBMVFC_ACTIVE) {
1792                 evt = ibmvfc_get_event(vhost);
1793                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1794
1795                 tmf = &evt->iu.cmd;
1796                 memset(tmf, 0, sizeof(*tmf));
1797                 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1798                 tmf->resp.len = sizeof(tmf->rsp);
1799                 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1800                 tmf->payload_len = sizeof(tmf->iu);
1801                 tmf->resp_len = sizeof(tmf->rsp);
1802                 tmf->cancel_key = (unsigned long)sdev->hostdata;
1803                 tmf->tgt_scsi_id = rport->port_id;
1804                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1805                 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1806                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
1807                 evt->sync_iu = &rsp_iu;
1808
1809                 init_completion(&evt->comp);
1810                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1811         }
1812
1813         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1814
1815         if (rsp_rc != 0) {
1816                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
1817                 return -EIO;
1818         }
1819
1820         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
1821         wait_for_completion(&evt->comp);
1822
1823         if (rsp_iu.cmd.status) {
1824                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
1825                         rsp_code = fc_rsp->data.info.rsp_code;
1826
1827                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
1828                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
1829                             ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
1830                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
1831                             fc_rsp->scsi_status);
1832                 rsp_rc = -EIO;
1833         } else
1834                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
1835
1836         spin_lock_irqsave(vhost->host->host_lock, flags);
1837         ibmvfc_free_event(evt);
1838         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1839         return rsp_rc;
1840 }
1841
1842 /**
1843  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
1844  * @sdev:       scsi device to cancel commands
1845  * @type:       type of error recovery being performed
1846  *
1847  * This sends a cancel to the VIOS for the specified device. This does
1848  * NOT send any abort to the actual device. That must be done separately.
1849  *
1850  * Returns:
1851  *      0 on success / other on failure
1852  **/
1853 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
1854 {
1855         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1856         struct scsi_target *starget = scsi_target(sdev);
1857         struct fc_rport *rport = starget_to_rport(starget);
1858         struct ibmvfc_tmf *tmf;
1859         struct ibmvfc_event *evt, *found_evt;
1860         union ibmvfc_iu rsp;
1861         int rsp_rc = -EBUSY;
1862         unsigned long flags;
1863         u16 status;
1864
1865         ENTER;
1866         spin_lock_irqsave(vhost->host->host_lock, flags);
1867         found_evt = NULL;
1868         list_for_each_entry(evt, &vhost->sent, queue) {
1869                 if (evt->cmnd && evt->cmnd->device == sdev) {
1870                         found_evt = evt;
1871                         break;
1872                 }
1873         }
1874
1875         if (!found_evt) {
1876                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1877                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
1878                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1879                 return 0;
1880         }
1881
1882         if (vhost->state == IBMVFC_ACTIVE) {
1883                 evt = ibmvfc_get_event(vhost);
1884                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1885
1886                 tmf = &evt->iu.tmf;
1887                 memset(tmf, 0, sizeof(*tmf));
1888                 tmf->common.version = 1;
1889                 tmf->common.opcode = IBMVFC_TMF_MAD;
1890                 tmf->common.length = sizeof(*tmf);
1891                 tmf->scsi_id = rport->port_id;
1892                 int_to_scsilun(sdev->lun, &tmf->lun);
1893                 tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
1894                 tmf->cancel_key = (unsigned long)sdev->hostdata;
1895                 tmf->my_cancel_key = (unsigned long)starget->hostdata;
1896
1897                 evt->sync_iu = &rsp;
1898                 init_completion(&evt->comp);
1899                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1900         }
1901
1902         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1903
1904         if (rsp_rc != 0) {
1905                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
1906                 return -EIO;
1907         }
1908
1909         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
1910
1911         wait_for_completion(&evt->comp);
1912         status = rsp.mad_common.status;
1913         spin_lock_irqsave(vhost->host->host_lock, flags);
1914         ibmvfc_free_event(evt);
1915         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1916
1917         if (status != IBMVFC_MAD_SUCCESS) {
1918                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
1919                 return -EIO;
1920         }
1921
1922         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
1923         return 0;
1924 }
1925
1926 /**
1927  * ibmvfc_match_target - Match function for specified target
1928  * @evt:        ibmvfc event struct
1929  * @device:     device to match (starget)
1930  *
1931  * Returns:
1932  *      1 if event matches starget / 0 if event does not match starget
1933  **/
1934 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
1935 {
1936         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
1937                 return 1;
1938         return 0;
1939 }
1940
1941 /**
1942  * ibmvfc_match_lun - Match function for specified LUN
1943  * @evt:        ibmvfc event struct
1944  * @device:     device to match (sdev)
1945  *
1946  * Returns:
1947  *      1 if event matches sdev / 0 if event does not match sdev
1948  **/
1949 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
1950 {
1951         if (evt->cmnd && evt->cmnd->device == device)
1952                 return 1;
1953         return 0;
1954 }
1955
1956 /**
1957  * ibmvfc_wait_for_ops - Wait for ops to complete
1958  * @vhost:      ibmvfc host struct
1959  * @device:     device to match (starget or sdev)
1960  * @match:      match function
1961  *
1962  * Returns:
1963  *      SUCCESS / FAILED
1964  **/
1965 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
1966                                int (*match) (struct ibmvfc_event *, void *))
1967 {
1968         struct ibmvfc_event *evt;
1969         DECLARE_COMPLETION_ONSTACK(comp);
1970         int wait;
1971         unsigned long flags;
1972         signed long timeout = init_timeout * HZ;
1973
1974         ENTER;
1975         do {
1976                 wait = 0;
1977                 spin_lock_irqsave(vhost->host->host_lock, flags);
1978                 list_for_each_entry(evt, &vhost->sent, queue) {
1979                         if (match(evt, device)) {
1980                                 evt->eh_comp = &comp;
1981                                 wait++;
1982                         }
1983                 }
1984                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1985
1986                 if (wait) {
1987                         timeout = wait_for_completion_timeout(&comp, timeout);
1988
1989                         if (!timeout) {
1990                                 wait = 0;
1991                                 spin_lock_irqsave(vhost->host->host_lock, flags);
1992                                 list_for_each_entry(evt, &vhost->sent, queue) {
1993                                         if (match(evt, device)) {
1994                                                 evt->eh_comp = NULL;
1995                                                 wait++;
1996                                         }
1997                                 }
1998                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1999                                 if (wait)
2000                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2001                                 LEAVE;
2002                                 return wait ? FAILED : SUCCESS;
2003                         }
2004                 }
2005         } while (wait);
2006
2007         LEAVE;
2008         return SUCCESS;
2009 }
2010
2011 /**
2012  * ibmvfc_eh_abort_handler - Abort a command
2013  * @cmd:        scsi command to abort
2014  *
2015  * Returns:
2016  *      SUCCESS / FAILED
2017  **/
2018 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2019 {
2020         struct scsi_device *sdev = cmd->device;
2021         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2022         int cancel_rc, abort_rc;
2023         int rc = FAILED;
2024
2025         ENTER;
2026         ibmvfc_wait_while_resetting(vhost);
2027         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2028         abort_rc = ibmvfc_abort_task_set(sdev);
2029
2030         if (!cancel_rc && !abort_rc)
2031                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2032
2033         LEAVE;
2034         return rc;
2035 }
2036
2037 /**
2038  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2039  * @cmd:        scsi command struct
2040  *
2041  * Returns:
2042  *      SUCCESS / FAILED
2043  **/
2044 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2045 {
2046         struct scsi_device *sdev = cmd->device;
2047         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2048         int cancel_rc, reset_rc;
2049         int rc = FAILED;
2050
2051         ENTER;
2052         ibmvfc_wait_while_resetting(vhost);
2053         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2054         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2055
2056         if (!cancel_rc && !reset_rc)
2057                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2058
2059         LEAVE;
2060         return rc;
2061 }
2062
2063 /**
2064  * ibmvfc_dev_cancel_all - Device iterated cancel all function
2065  * @sdev:       scsi device struct
2066  * @data:       return code
2067  *
2068  **/
2069 static void ibmvfc_dev_cancel_all(struct scsi_device *sdev, void *data)
2070 {
2071         unsigned long *rc = data;
2072         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2073 }
2074
2075 /**
2076  * ibmvfc_dev_abort_all - Device iterated abort task set function
2077  * @sdev:       scsi device struct
2078  * @data:       return code
2079  *
2080  **/
2081 static void ibmvfc_dev_abort_all(struct scsi_device *sdev, void *data)
2082 {
2083         unsigned long *rc = data;
2084         *rc |= ibmvfc_abort_task_set(sdev);
2085 }
2086
2087 /**
2088  * ibmvfc_eh_target_reset_handler - Reset the target
2089  * @cmd:        scsi command struct
2090  *
2091  * Returns:
2092  *      SUCCESS / FAILED
2093  **/
2094 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2095 {
2096         struct scsi_device *sdev = cmd->device;
2097         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2098         struct scsi_target *starget = scsi_target(sdev);
2099         int reset_rc;
2100         int rc = FAILED;
2101         unsigned long cancel_rc = 0;
2102
2103         ENTER;
2104         ibmvfc_wait_while_resetting(vhost);
2105         starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
2106         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2107
2108         if (!cancel_rc && !reset_rc)
2109                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2110
2111         LEAVE;
2112         return rc;
2113 }
2114
2115 /**
2116  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2117  * @cmd:        struct scsi_cmnd having problems
2118  *
2119  **/
2120 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2121 {
2122         int rc;
2123         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2124
2125         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2126         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2127         return rc ? FAILED : SUCCESS;
2128 }
2129
2130 /**
2131  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2132  * @rport:              rport struct
2133  *
2134  * Return value:
2135  *      none
2136  **/
2137 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2138 {
2139         struct scsi_target *starget = to_scsi_target(&rport->dev);
2140         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2141         struct ibmvfc_host *vhost = shost_priv(shost);
2142         unsigned long cancel_rc = 0;
2143         unsigned long abort_rc = 0;
2144         int rc = FAILED;
2145
2146         ENTER;
2147         starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
2148         starget_for_each_device(starget, &abort_rc, ibmvfc_dev_abort_all);
2149
2150         if (!cancel_rc && !abort_rc)
2151                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2152
2153         if (rc == FAILED)
2154                 ibmvfc_issue_fc_host_lip(shost);
2155         LEAVE;
2156 }
2157
2158 static const struct {
2159         enum ibmvfc_async_event ae;
2160         const char *desc;
2161 } ae_desc [] = {
2162         { IBMVFC_AE_ELS_PLOGI,          "PLOGI" },
2163         { IBMVFC_AE_ELS_LOGO,           "LOGO" },
2164         { IBMVFC_AE_ELS_PRLO,           "PRLO" },
2165         { IBMVFC_AE_SCN_NPORT,          "N-Port SCN" },
2166         { IBMVFC_AE_SCN_GROUP,          "Group SCN" },
2167         { IBMVFC_AE_SCN_DOMAIN,         "Domain SCN" },
2168         { IBMVFC_AE_SCN_FABRIC,         "Fabric SCN" },
2169         { IBMVFC_AE_LINK_UP,            "Link Up" },
2170         { IBMVFC_AE_LINK_DOWN,          "Link Down" },
2171         { IBMVFC_AE_LINK_DEAD,          "Link Dead" },
2172         { IBMVFC_AE_HALT,                       "Halt" },
2173         { IBMVFC_AE_RESUME,             "Resume" },
2174         { IBMVFC_AE_ADAPTER_FAILED,     "Adapter Failed" },
2175 };
2176
2177 static const char *unknown_ae = "Unknown async";
2178
2179 /**
2180  * ibmvfc_get_ae_desc - Get text description for async event
2181  * @ae: async event
2182  *
2183  **/
2184 static const char *ibmvfc_get_ae_desc(u64 ae)
2185 {
2186         int i;
2187
2188         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2189                 if (ae_desc[i].ae == ae)
2190                         return ae_desc[i].desc;
2191
2192         return unknown_ae;
2193 }
2194
2195 /**
2196  * ibmvfc_handle_async - Handle an async event from the adapter
2197  * @crq:        crq to process
2198  * @vhost:      ibmvfc host struct
2199  *
2200  **/
2201 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2202                                 struct ibmvfc_host *vhost)
2203 {
2204         const char *desc = ibmvfc_get_ae_desc(crq->event);
2205         struct ibmvfc_target *tgt;
2206
2207         ibmvfc_log(vhost, 3, "%s event received. scsi_id: %llx, wwpn: %llx,"
2208                    " node_name: %llx\n", desc, crq->scsi_id, crq->wwpn, crq->node_name);
2209
2210         switch (crq->event) {
2211         case IBMVFC_AE_RESUME:
2212                 switch (crq->link_state) {
2213                 case IBMVFC_AE_LS_LINK_DOWN:
2214                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2215                         break;
2216                 case IBMVFC_AE_LS_LINK_DEAD:
2217                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2218                         break;
2219                 case IBMVFC_AE_LS_LINK_UP:
2220                 case IBMVFC_AE_LS_LINK_BOUNCED:
2221                 default:
2222                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2223                         vhost->delay_init = 1;
2224                         __ibmvfc_reset_host(vhost);
2225                         break;
2226                 };
2227
2228                 break;
2229         case IBMVFC_AE_LINK_UP:
2230                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2231                 vhost->delay_init = 1;
2232                 __ibmvfc_reset_host(vhost);
2233                 break;
2234         case IBMVFC_AE_SCN_FABRIC:
2235         case IBMVFC_AE_SCN_DOMAIN:
2236                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2237                 vhost->delay_init = 1;
2238                 __ibmvfc_reset_host(vhost);
2239                 break;
2240         case IBMVFC_AE_SCN_NPORT:
2241         case IBMVFC_AE_SCN_GROUP:
2242                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2243                 ibmvfc_reinit_host(vhost);
2244                 break;
2245         case IBMVFC_AE_ELS_LOGO:
2246         case IBMVFC_AE_ELS_PRLO:
2247         case IBMVFC_AE_ELS_PLOGI:
2248                 list_for_each_entry(tgt, &vhost->targets, queue) {
2249                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2250                                 break;
2251                         if (crq->scsi_id && tgt->scsi_id != crq->scsi_id)
2252                                 continue;
2253                         if (crq->wwpn && tgt->ids.port_name != crq->wwpn)
2254                                 continue;
2255                         if (crq->node_name && tgt->ids.node_name != crq->node_name)
2256                                 continue;
2257                         if (tgt->need_login && crq->event == IBMVFC_AE_ELS_LOGO)
2258                                 tgt->logo_rcvd = 1;
2259                         if (!tgt->need_login || crq->event == IBMVFC_AE_ELS_PLOGI) {
2260                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2261                                 ibmvfc_reinit_host(vhost);
2262                         }
2263                 }
2264                 break;
2265         case IBMVFC_AE_LINK_DOWN:
2266         case IBMVFC_AE_ADAPTER_FAILED:
2267                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2268                 break;
2269         case IBMVFC_AE_LINK_DEAD:
2270                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2271                 break;
2272         case IBMVFC_AE_HALT:
2273                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2274                 break;
2275         default:
2276                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2277                 break;
2278         };
2279 }
2280
2281 /**
2282  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2283  * @crq:        Command/Response queue
2284  * @vhost:      ibmvfc host struct
2285  *
2286  **/
2287 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2288 {
2289         long rc;
2290         struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
2291
2292         switch (crq->valid) {
2293         case IBMVFC_CRQ_INIT_RSP:
2294                 switch (crq->format) {
2295                 case IBMVFC_CRQ_INIT:
2296                         dev_info(vhost->dev, "Partner initialized\n");
2297                         /* Send back a response */
2298                         rc = ibmvfc_send_crq_init_complete(vhost);
2299                         if (rc == 0)
2300                                 ibmvfc_init_host(vhost, 0);
2301                         else
2302                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2303                         break;
2304                 case IBMVFC_CRQ_INIT_COMPLETE:
2305                         dev_info(vhost->dev, "Partner initialization complete\n");
2306                         ibmvfc_init_host(vhost, 0);
2307                         break;
2308                 default:
2309                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2310                 }
2311                 return;
2312         case IBMVFC_CRQ_XPORT_EVENT:
2313                 vhost->state = IBMVFC_NO_CRQ;
2314                 vhost->logged_in = 0;
2315                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2316                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2317                         /* We need to re-setup the interpartition connection */
2318                         dev_info(vhost->dev, "Re-enabling adapter\n");
2319                         vhost->client_migrated = 1;
2320                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2321                         if ((rc = ibmvfc_reenable_crq_queue(vhost)) ||
2322                             (rc = ibmvfc_send_crq_init(vhost))) {
2323                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2324                                 dev_err(vhost->dev, "Error after enable (rc=%ld)\n", rc);
2325                         } else
2326                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2327                 } else {
2328                         dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2329
2330                         ibmvfc_purge_requests(vhost, DID_ERROR);
2331                         if ((rc = ibmvfc_reset_crq(vhost)) ||
2332                             (rc = ibmvfc_send_crq_init(vhost))) {
2333                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2334                                 dev_err(vhost->dev, "Error after reset (rc=%ld)\n", rc);
2335                         } else
2336                                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2337                 }
2338                 return;
2339         case IBMVFC_CRQ_CMD_RSP:
2340                 break;
2341         default:
2342                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2343                 return;
2344         }
2345
2346         if (crq->format == IBMVFC_ASYNC_EVENT)
2347                 return;
2348
2349         /* The only kind of payload CRQs we should get are responses to
2350          * things we send. Make sure this response is to something we
2351          * actually sent
2352          */
2353         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2354                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2355                         crq->ioba);
2356                 return;
2357         }
2358
2359         if (unlikely(atomic_read(&evt->free))) {
2360                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2361                         crq->ioba);
2362                 return;
2363         }
2364
2365         del_timer(&evt->timer);
2366         list_del(&evt->queue);
2367         ibmvfc_trc_end(evt);
2368         evt->done(evt);
2369 }
2370
2371 /**
2372  * ibmvfc_scan_finished - Check if the device scan is done.
2373  * @shost:      scsi host struct
2374  * @time:       current elapsed time
2375  *
2376  * Returns:
2377  *      0 if scan is not done / 1 if scan is done
2378  **/
2379 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2380 {
2381         unsigned long flags;
2382         struct ibmvfc_host *vhost = shost_priv(shost);
2383         int done = 0;
2384
2385         spin_lock_irqsave(shost->host_lock, flags);
2386         if (time >= (init_timeout * HZ)) {
2387                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2388                          "continuing initialization\n", init_timeout);
2389                 done = 1;
2390         }
2391
2392         if (vhost->scan_complete)
2393                 done = 1;
2394         spin_unlock_irqrestore(shost->host_lock, flags);
2395         return done;
2396 }
2397
2398 /**
2399  * ibmvfc_slave_alloc - Setup the device's task set value
2400  * @sdev:       struct scsi_device device to configure
2401  *
2402  * Set the device's task set value so that error handling works as
2403  * expected.
2404  *
2405  * Returns:
2406  *      0 on success / -ENXIO if device does not exist
2407  **/
2408 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2409 {
2410         struct Scsi_Host *shost = sdev->host;
2411         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2412         struct ibmvfc_host *vhost = shost_priv(shost);
2413         unsigned long flags = 0;
2414
2415         if (!rport || fc_remote_port_chkready(rport))
2416                 return -ENXIO;
2417
2418         spin_lock_irqsave(shost->host_lock, flags);
2419         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2420         spin_unlock_irqrestore(shost->host_lock, flags);
2421         return 0;
2422 }
2423
2424 /**
2425  * ibmvfc_target_alloc - Setup the target's task set value
2426  * @starget:    struct scsi_target
2427  *
2428  * Set the target's task set value so that error handling works as
2429  * expected.
2430  *
2431  * Returns:
2432  *      0 on success / -ENXIO if device does not exist
2433  **/
2434 static int ibmvfc_target_alloc(struct scsi_target *starget)
2435 {
2436         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2437         struct ibmvfc_host *vhost = shost_priv(shost);
2438         unsigned long flags = 0;
2439
2440         spin_lock_irqsave(shost->host_lock, flags);
2441         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2442         spin_unlock_irqrestore(shost->host_lock, flags);
2443         return 0;
2444 }
2445
2446 /**
2447  * ibmvfc_slave_configure - Configure the device
2448  * @sdev:       struct scsi_device device to configure
2449  *
2450  * Enable allow_restart for a device if it is a disk. Adjust the
2451  * queue_depth here also.
2452  *
2453  * Returns:
2454  *      0
2455  **/
2456 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2457 {
2458         struct Scsi_Host *shost = sdev->host;
2459         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
2460         unsigned long flags = 0;
2461
2462         spin_lock_irqsave(shost->host_lock, flags);
2463         if (sdev->type == TYPE_DISK)
2464                 sdev->allow_restart = 1;
2465
2466         if (sdev->tagged_supported) {
2467                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2468                 scsi_activate_tcq(sdev, sdev->queue_depth);
2469         } else
2470                 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2471
2472         rport->dev_loss_tmo = dev_loss_tmo;
2473         spin_unlock_irqrestore(shost->host_lock, flags);
2474         return 0;
2475 }
2476
2477 /**
2478  * ibmvfc_change_queue_depth - Change the device's queue depth
2479  * @sdev:       scsi device struct
2480  * @qdepth:     depth to set
2481  *
2482  * Return value:
2483  *      actual depth set
2484  **/
2485 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2486 {
2487         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2488                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2489
2490         scsi_adjust_queue_depth(sdev, 0, qdepth);
2491         return sdev->queue_depth;
2492 }
2493
2494 /**
2495  * ibmvfc_change_queue_type - Change the device's queue type
2496  * @sdev:               scsi device struct
2497  * @tag_type:   type of tags to use
2498  *
2499  * Return value:
2500  *      actual queue type set
2501  **/
2502 static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
2503 {
2504         if (sdev->tagged_supported) {
2505                 scsi_set_tag_type(sdev, tag_type);
2506
2507                 if (tag_type)
2508                         scsi_activate_tcq(sdev, sdev->queue_depth);
2509                 else
2510                         scsi_deactivate_tcq(sdev, sdev->queue_depth);
2511         } else
2512                 tag_type = 0;
2513
2514         return tag_type;
2515 }
2516
2517 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2518                                                  struct device_attribute *attr, char *buf)
2519 {
2520         struct Scsi_Host *shost = class_to_shost(dev);
2521         struct ibmvfc_host *vhost = shost_priv(shost);
2522
2523         return snprintf(buf, PAGE_SIZE, "%s\n",
2524                         vhost->login_buf->resp.partition_name);
2525 }
2526
2527 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2528                                             struct device_attribute *attr, char *buf)
2529 {
2530         struct Scsi_Host *shost = class_to_shost(dev);
2531         struct ibmvfc_host *vhost = shost_priv(shost);
2532
2533         return snprintf(buf, PAGE_SIZE, "%s\n",
2534                         vhost->login_buf->resp.device_name);
2535 }
2536
2537 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2538                                          struct device_attribute *attr, char *buf)
2539 {
2540         struct Scsi_Host *shost = class_to_shost(dev);
2541         struct ibmvfc_host *vhost = shost_priv(shost);
2542
2543         return snprintf(buf, PAGE_SIZE, "%s\n",
2544                         vhost->login_buf->resp.port_loc_code);
2545 }
2546
2547 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2548                                          struct device_attribute *attr, char *buf)
2549 {
2550         struct Scsi_Host *shost = class_to_shost(dev);
2551         struct ibmvfc_host *vhost = shost_priv(shost);
2552
2553         return snprintf(buf, PAGE_SIZE, "%s\n",
2554                         vhost->login_buf->resp.drc_name);
2555 }
2556
2557 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2558                                              struct device_attribute *attr, char *buf)
2559 {
2560         struct Scsi_Host *shost = class_to_shost(dev);
2561         struct ibmvfc_host *vhost = shost_priv(shost);
2562         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2563 }
2564
2565 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2566                                              struct device_attribute *attr, char *buf)
2567 {
2568         struct Scsi_Host *shost = class_to_shost(dev);
2569         struct ibmvfc_host *vhost = shost_priv(shost);
2570         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2571 }
2572
2573 /**
2574  * ibmvfc_show_log_level - Show the adapter's error logging level
2575  * @dev:        class device struct
2576  * @buf:        buffer
2577  *
2578  * Return value:
2579  *      number of bytes printed to buffer
2580  **/
2581 static ssize_t ibmvfc_show_log_level(struct device *dev,
2582                                      struct device_attribute *attr, char *buf)
2583 {
2584         struct Scsi_Host *shost = class_to_shost(dev);
2585         struct ibmvfc_host *vhost = shost_priv(shost);
2586         unsigned long flags = 0;
2587         int len;
2588
2589         spin_lock_irqsave(shost->host_lock, flags);
2590         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2591         spin_unlock_irqrestore(shost->host_lock, flags);
2592         return len;
2593 }
2594
2595 /**
2596  * ibmvfc_store_log_level - Change the adapter's error logging level
2597  * @dev:        class device struct
2598  * @buf:        buffer
2599  *
2600  * Return value:
2601  *      number of bytes printed to buffer
2602  **/
2603 static ssize_t ibmvfc_store_log_level(struct device *dev,
2604                                       struct device_attribute *attr,
2605                                       const char *buf, size_t count)
2606 {
2607         struct Scsi_Host *shost = class_to_shost(dev);
2608         struct ibmvfc_host *vhost = shost_priv(shost);
2609         unsigned long flags = 0;
2610
2611         spin_lock_irqsave(shost->host_lock, flags);
2612         vhost->log_level = simple_strtoul(buf, NULL, 10);
2613         spin_unlock_irqrestore(shost->host_lock, flags);
2614         return strlen(buf);
2615 }
2616
2617 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
2618 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
2619 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
2620 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
2621 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
2622 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
2623 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
2624                    ibmvfc_show_log_level, ibmvfc_store_log_level);
2625
2626 #ifdef CONFIG_SCSI_IBMVFC_TRACE
2627 /**
2628  * ibmvfc_read_trace - Dump the adapter trace
2629  * @kobj:               kobject struct
2630  * @bin_attr:   bin_attribute struct
2631  * @buf:                buffer
2632  * @off:                offset
2633  * @count:              buffer size
2634  *
2635  * Return value:
2636  *      number of bytes printed to buffer
2637  **/
2638 static ssize_t ibmvfc_read_trace(struct kobject *kobj,
2639                                  struct bin_attribute *bin_attr,
2640                                  char *buf, loff_t off, size_t count)
2641 {
2642         struct device *dev = container_of(kobj, struct device, kobj);
2643         struct Scsi_Host *shost = class_to_shost(dev);
2644         struct ibmvfc_host *vhost = shost_priv(shost);
2645         unsigned long flags = 0;
2646         int size = IBMVFC_TRACE_SIZE;
2647         char *src = (char *)vhost->trace;
2648
2649         if (off > size)
2650                 return 0;
2651         if (off + count > size) {
2652                 size -= off;
2653                 count = size;
2654         }
2655
2656         spin_lock_irqsave(shost->host_lock, flags);
2657         memcpy(buf, &src[off], count);
2658         spin_unlock_irqrestore(shost->host_lock, flags);
2659         return count;
2660 }
2661
2662 static struct bin_attribute ibmvfc_trace_attr = {
2663         .attr = {
2664                 .name = "trace",
2665                 .mode = S_IRUGO,
2666         },
2667         .size = 0,
2668         .read = ibmvfc_read_trace,
2669 };
2670 #endif
2671
2672 static struct device_attribute *ibmvfc_attrs[] = {
2673         &dev_attr_partition_name,
2674         &dev_attr_device_name,
2675         &dev_attr_port_loc_code,
2676         &dev_attr_drc_name,
2677         &dev_attr_npiv_version,
2678         &dev_attr_capabilities,
2679         &dev_attr_log_level,
2680         NULL
2681 };
2682
2683 static struct scsi_host_template driver_template = {
2684         .module = THIS_MODULE,
2685         .name = "IBM POWER Virtual FC Adapter",
2686         .proc_name = IBMVFC_NAME,
2687         .queuecommand = ibmvfc_queuecommand,
2688         .eh_abort_handler = ibmvfc_eh_abort_handler,
2689         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
2690         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
2691         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
2692         .slave_alloc = ibmvfc_slave_alloc,
2693         .slave_configure = ibmvfc_slave_configure,
2694         .target_alloc = ibmvfc_target_alloc,
2695         .scan_finished = ibmvfc_scan_finished,
2696         .change_queue_depth = ibmvfc_change_queue_depth,
2697         .change_queue_type = ibmvfc_change_queue_type,
2698         .cmd_per_lun = 16,
2699         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
2700         .this_id = -1,
2701         .sg_tablesize = SG_ALL,
2702         .max_sectors = IBMVFC_MAX_SECTORS,
2703         .use_clustering = ENABLE_CLUSTERING,
2704         .shost_attrs = ibmvfc_attrs,
2705 };
2706
2707 /**
2708  * ibmvfc_next_async_crq - Returns the next entry in async queue
2709  * @vhost:      ibmvfc host struct
2710  *
2711  * Returns:
2712  *      Pointer to next entry in queue / NULL if empty
2713  **/
2714 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
2715 {
2716         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
2717         struct ibmvfc_async_crq *crq;
2718
2719         crq = &async_crq->msgs[async_crq->cur];
2720         if (crq->valid & 0x80) {
2721                 if (++async_crq->cur == async_crq->size)
2722                         async_crq->cur = 0;
2723         } else
2724                 crq = NULL;
2725
2726         return crq;
2727 }
2728
2729 /**
2730  * ibmvfc_next_crq - Returns the next entry in message queue
2731  * @vhost:      ibmvfc host struct
2732  *
2733  * Returns:
2734  *      Pointer to next entry in queue / NULL if empty
2735  **/
2736 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
2737 {
2738         struct ibmvfc_crq_queue *queue = &vhost->crq;
2739         struct ibmvfc_crq *crq;
2740
2741         crq = &queue->msgs[queue->cur];
2742         if (crq->valid & 0x80) {
2743                 if (++queue->cur == queue->size)
2744                         queue->cur = 0;
2745         } else
2746                 crq = NULL;
2747
2748         return crq;
2749 }
2750
2751 /**
2752  * ibmvfc_interrupt - Interrupt handler
2753  * @irq:                number of irq to handle, not used
2754  * @dev_instance: ibmvfc_host that received interrupt
2755  *
2756  * Returns:
2757  *      IRQ_HANDLED
2758  **/
2759 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
2760 {
2761         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
2762         unsigned long flags;
2763
2764         spin_lock_irqsave(vhost->host->host_lock, flags);
2765         vio_disable_interrupts(to_vio_dev(vhost->dev));
2766         tasklet_schedule(&vhost->tasklet);
2767         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2768         return IRQ_HANDLED;
2769 }
2770
2771 /**
2772  * ibmvfc_tasklet - Interrupt handler tasklet
2773  * @data:               ibmvfc host struct
2774  *
2775  * Returns:
2776  *      Nothing
2777  **/
2778 static void ibmvfc_tasklet(void *data)
2779 {
2780         struct ibmvfc_host *vhost = data;
2781         struct vio_dev *vdev = to_vio_dev(vhost->dev);
2782         struct ibmvfc_crq *crq;
2783         struct ibmvfc_async_crq *async;
2784         unsigned long flags;
2785         int done = 0;
2786
2787         spin_lock_irqsave(vhost->host->host_lock, flags);
2788         while (!done) {
2789                 /* Pull all the valid messages off the async CRQ */
2790                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
2791                         ibmvfc_handle_async(async, vhost);
2792                         async->valid = 0;
2793                 }
2794
2795                 /* Pull all the valid messages off the CRQ */
2796                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
2797                         ibmvfc_handle_crq(crq, vhost);
2798                         crq->valid = 0;
2799                 }
2800
2801                 vio_enable_interrupts(vdev);
2802                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
2803                         vio_disable_interrupts(vdev);
2804                         ibmvfc_handle_async(async, vhost);
2805                         async->valid = 0;
2806                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
2807                         vio_disable_interrupts(vdev);
2808                         ibmvfc_handle_crq(crq, vhost);
2809                         crq->valid = 0;
2810                 } else
2811                         done = 1;
2812         }
2813
2814         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2815 }
2816
2817 /**
2818  * ibmvfc_init_tgt - Set the next init job step for the target
2819  * @tgt:                ibmvfc target struct
2820  * @job_step:   job step to perform
2821  *
2822  **/
2823 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
2824                             void (*job_step) (struct ibmvfc_target *))
2825 {
2826         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
2827         tgt->job_step = job_step;
2828         wake_up(&tgt->vhost->work_wait_q);
2829 }
2830
2831 /**
2832  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
2833  * @tgt:                ibmvfc target struct
2834  * @job_step:   initialization job step
2835  *
2836  * Returns: 1 if step will be retried / 0 if not
2837  *
2838  **/
2839 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
2840                                   void (*job_step) (struct ibmvfc_target *))
2841 {
2842         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
2843                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2844                 wake_up(&tgt->vhost->work_wait_q);
2845                 return 0;
2846         } else
2847                 ibmvfc_init_tgt(tgt, job_step);
2848         return 1;
2849 }
2850
2851 /* Defined in FC-LS */
2852 static const struct {
2853         int code;
2854         int retry;
2855         int logged_in;
2856 } prli_rsp [] = {
2857         { 0, 1, 0 },
2858         { 1, 0, 1 },
2859         { 2, 1, 0 },
2860         { 3, 1, 0 },
2861         { 4, 0, 0 },
2862         { 5, 0, 0 },
2863         { 6, 0, 1 },
2864         { 7, 0, 0 },
2865         { 8, 1, 0 },
2866 };
2867
2868 /**
2869  * ibmvfc_get_prli_rsp - Find PRLI response index
2870  * @flags:      PRLI response flags
2871  *
2872  **/
2873 static int ibmvfc_get_prli_rsp(u16 flags)
2874 {
2875         int i;
2876         int code = (flags & 0x0f00) >> 8;
2877
2878         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
2879                 if (prli_rsp[i].code == code)
2880                         return i;
2881
2882         return 0;
2883 }
2884
2885 /**
2886  * ibmvfc_tgt_prli_done - Completion handler for Process Login
2887  * @evt:        ibmvfc event struct
2888  *
2889  **/
2890 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
2891 {
2892         struct ibmvfc_target *tgt = evt->tgt;
2893         struct ibmvfc_host *vhost = evt->vhost;
2894         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
2895         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
2896         u32 status = rsp->common.status;
2897         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
2898
2899         vhost->discovery_threads--;
2900         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2901         switch (status) {
2902         case IBMVFC_MAD_SUCCESS:
2903                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
2904                         parms->type, parms->flags, parms->service_parms);
2905
2906                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
2907                         index = ibmvfc_get_prli_rsp(parms->flags);
2908                         if (prli_rsp[index].logged_in) {
2909                                 if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) {
2910                                         tgt->need_login = 0;
2911                                         tgt->ids.roles = 0;
2912                                         if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC)
2913                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
2914                                         if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC)
2915                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
2916                                         tgt->add_rport = 1;
2917                                 } else
2918                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2919                         } else if (prli_rsp[index].retry)
2920                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2921                         else
2922                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2923                 } else
2924                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2925                 break;
2926         case IBMVFC_MAD_DRIVER_FAILED:
2927                 break;
2928         case IBMVFC_MAD_CRQ_ERROR:
2929                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2930                 break;
2931         case IBMVFC_MAD_FAILED:
2932         default:
2933                 if ((rsp->status & IBMVFC_VIOS_FAILURE) && rsp->error == IBMVFC_PLOGI_REQUIRED)
2934                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
2935                 else if (tgt->logo_rcvd)
2936                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
2937                 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
2938                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2939                 else
2940                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2941
2942                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
2943                         ibmvfc_get_cmd_error(rsp->status, rsp->error),
2944                         rsp->status, rsp->error, status);
2945                 break;
2946         };
2947
2948         kref_put(&tgt->kref, ibmvfc_release_tgt);
2949         ibmvfc_free_event(evt);
2950         wake_up(&vhost->work_wait_q);
2951 }
2952
2953 /**
2954  * ibmvfc_tgt_send_prli - Send a process login
2955  * @tgt:        ibmvfc target struct
2956  *
2957  **/
2958 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
2959 {
2960         struct ibmvfc_process_login *prli;
2961         struct ibmvfc_host *vhost = tgt->vhost;
2962         struct ibmvfc_event *evt;
2963
2964         if (vhost->discovery_threads >= disc_threads)
2965                 return;
2966
2967         kref_get(&tgt->kref);
2968         evt = ibmvfc_get_event(vhost);
2969         vhost->discovery_threads++;
2970         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
2971         evt->tgt = tgt;
2972         prli = &evt->iu.prli;
2973         memset(prli, 0, sizeof(*prli));
2974         prli->common.version = 1;
2975         prli->common.opcode = IBMVFC_PROCESS_LOGIN;
2976         prli->common.length = sizeof(*prli);
2977         prli->scsi_id = tgt->scsi_id;
2978
2979         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
2980         prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
2981         prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
2982
2983         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2984         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2985                 vhost->discovery_threads--;
2986                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2987                 kref_put(&tgt->kref, ibmvfc_release_tgt);
2988         } else
2989                 tgt_dbg(tgt, "Sent process login\n");
2990 }
2991
2992 /**
2993  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
2994  * @evt:        ibmvfc event struct
2995  *
2996  **/
2997 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
2998 {
2999         struct ibmvfc_target *tgt = evt->tgt;
3000         struct ibmvfc_host *vhost = evt->vhost;
3001         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3002         u32 status = rsp->common.status;
3003         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3004
3005         vhost->discovery_threads--;
3006         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3007         switch (status) {
3008         case IBMVFC_MAD_SUCCESS:
3009                 tgt_dbg(tgt, "Port Login succeeded\n");
3010                 if (tgt->ids.port_name &&
3011                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3012                         vhost->reinit = 1;
3013                         tgt_dbg(tgt, "Port re-init required\n");
3014                         break;
3015                 }
3016                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3017                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3018                 tgt->ids.port_id = tgt->scsi_id;
3019                 memcpy(&tgt->service_parms, &rsp->service_parms,
3020                        sizeof(tgt->service_parms));
3021                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3022                        sizeof(tgt->service_parms_change));
3023                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3024                 break;
3025         case IBMVFC_MAD_DRIVER_FAILED:
3026                 break;
3027         case IBMVFC_MAD_CRQ_ERROR:
3028                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3029                 break;
3030         case IBMVFC_MAD_FAILED:
3031         default:
3032                 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3033                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3034                 else
3035                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3036
3037                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3038                         ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3039                         ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3040                         ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
3041                 break;
3042         };
3043
3044         kref_put(&tgt->kref, ibmvfc_release_tgt);
3045         ibmvfc_free_event(evt);
3046         wake_up(&vhost->work_wait_q);
3047 }
3048
3049 /**
3050  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3051  * @tgt:        ibmvfc target struct
3052  *
3053  **/
3054 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3055 {
3056         struct ibmvfc_port_login *plogi;
3057         struct ibmvfc_host *vhost = tgt->vhost;
3058         struct ibmvfc_event *evt;
3059
3060         if (vhost->discovery_threads >= disc_threads)
3061                 return;
3062
3063         kref_get(&tgt->kref);
3064         tgt->logo_rcvd = 0;
3065         evt = ibmvfc_get_event(vhost);
3066         vhost->discovery_threads++;
3067         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3068         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3069         evt->tgt = tgt;
3070         plogi = &evt->iu.plogi;
3071         memset(plogi, 0, sizeof(*plogi));
3072         plogi->common.version = 1;
3073         plogi->common.opcode = IBMVFC_PORT_LOGIN;
3074         plogi->common.length = sizeof(*plogi);
3075         plogi->scsi_id = tgt->scsi_id;
3076
3077         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3078                 vhost->discovery_threads--;
3079                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3080                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3081         } else
3082                 tgt_dbg(tgt, "Sent port login\n");
3083 }
3084
3085 /**
3086  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3087  * @evt:        ibmvfc event struct
3088  *
3089  **/
3090 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3091 {
3092         struct ibmvfc_target *tgt = evt->tgt;
3093         struct ibmvfc_host *vhost = evt->vhost;
3094         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3095         u32 status = rsp->common.status;
3096
3097         vhost->discovery_threads--;
3098         ibmvfc_free_event(evt);
3099         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3100
3101         switch (status) {
3102         case IBMVFC_MAD_SUCCESS:
3103                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3104                 break;
3105         case IBMVFC_MAD_DRIVER_FAILED:
3106                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3107                 wake_up(&vhost->work_wait_q);
3108                 return;
3109         case IBMVFC_MAD_FAILED:
3110         default:
3111                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3112                 break;
3113         };
3114
3115         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3116                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3117         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3118                  tgt->scsi_id != tgt->new_scsi_id)
3119                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3120         kref_put(&tgt->kref, ibmvfc_release_tgt);
3121         wake_up(&vhost->work_wait_q);
3122 }
3123
3124 /**
3125  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3126  * @tgt:                ibmvfc target struct
3127  *
3128  **/
3129 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3130 {
3131         struct ibmvfc_implicit_logout *mad;
3132         struct ibmvfc_host *vhost = tgt->vhost;
3133         struct ibmvfc_event *evt;
3134
3135         if (vhost->discovery_threads >= disc_threads)
3136                 return;
3137
3138         kref_get(&tgt->kref);
3139         evt = ibmvfc_get_event(vhost);
3140         vhost->discovery_threads++;
3141         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3142         evt->tgt = tgt;
3143         mad = &evt->iu.implicit_logout;
3144         memset(mad, 0, sizeof(*mad));
3145         mad->common.version = 1;
3146         mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
3147         mad->common.length = sizeof(*mad);
3148         mad->old_scsi_id = tgt->scsi_id;
3149
3150         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3151         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3152                 vhost->discovery_threads--;
3153                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3154                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3155         } else
3156                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3157 }
3158
3159 /**
3160  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3161  * @mad:        ibmvfc passthru mad struct
3162  * @tgt:        ibmvfc target struct
3163  *
3164  * Returns:
3165  *      1 if PLOGI needed / 0 if PLOGI not needed
3166  **/
3167 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3168                                     struct ibmvfc_target *tgt)
3169 {
3170         if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3171                    sizeof(tgt->ids.port_name)))
3172                 return 1;
3173         if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3174                    sizeof(tgt->ids.node_name)))
3175                 return 1;
3176         if (mad->fc_iu.response[6] != tgt->scsi_id)
3177                 return 1;
3178         return 0;
3179 }
3180
3181 /**
3182  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3183  * @evt:        ibmvfc event struct
3184  *
3185  **/
3186 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3187 {
3188         struct ibmvfc_target *tgt = evt->tgt;
3189         struct ibmvfc_host *vhost = evt->vhost;
3190         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3191         u32 status = mad->common.status;
3192         u8 fc_reason, fc_explain;
3193
3194         vhost->discovery_threads--;
3195         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3196         del_timer(&tgt->timer);
3197
3198         switch (status) {
3199         case IBMVFC_MAD_SUCCESS:
3200                 tgt_dbg(tgt, "ADISC succeeded\n");
3201                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3202                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3203                 break;
3204         case IBMVFC_MAD_DRIVER_FAILED:
3205                 break;
3206         case IBMVFC_MAD_FAILED:
3207         default:
3208                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3209                 fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16;
3210                 fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8;
3211                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3212                          ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error),
3213                          mad->iu.status, mad->iu.error,
3214                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3215                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3216                 break;
3217         };
3218
3219         kref_put(&tgt->kref, ibmvfc_release_tgt);
3220         ibmvfc_free_event(evt);
3221         wake_up(&vhost->work_wait_q);
3222 }
3223
3224 /**
3225  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3226  * @evt:                ibmvfc event struct
3227  *
3228  **/
3229 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3230 {
3231         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3232
3233         memset(mad, 0, sizeof(*mad));
3234         mad->common.version = 1;
3235         mad->common.opcode = IBMVFC_PASSTHRU;
3236         mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
3237         mad->cmd_ioba.va = (u64)evt->crq.ioba +
3238                 offsetof(struct ibmvfc_passthru_mad, iu);
3239         mad->cmd_ioba.len = sizeof(mad->iu);
3240         mad->iu.cmd_len = sizeof(mad->fc_iu.payload);
3241         mad->iu.rsp_len = sizeof(mad->fc_iu.response);
3242         mad->iu.cmd.va = (u64)evt->crq.ioba +
3243                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3244                 offsetof(struct ibmvfc_passthru_fc_iu, payload);
3245         mad->iu.cmd.len = sizeof(mad->fc_iu.payload);
3246         mad->iu.rsp.va = (u64)evt->crq.ioba +
3247                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3248                 offsetof(struct ibmvfc_passthru_fc_iu, response);
3249         mad->iu.rsp.len = sizeof(mad->fc_iu.response);
3250 }
3251
3252 /**
3253  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3254  * @evt:                ibmvfc event struct
3255  *
3256  * Just cleanup this event struct. Everything else is handled by
3257  * the ADISC completion handler. If the ADISC never actually comes
3258  * back, we still have the timer running on the ADISC event struct
3259  * which will fire and cause the CRQ to get reset.
3260  *
3261  **/
3262 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3263 {
3264         struct ibmvfc_host *vhost = evt->vhost;
3265         struct ibmvfc_target *tgt = evt->tgt;
3266
3267         tgt_dbg(tgt, "ADISC cancel complete\n");
3268         vhost->abort_threads--;
3269         ibmvfc_free_event(evt);
3270         kref_put(&tgt->kref, ibmvfc_release_tgt);
3271         wake_up(&vhost->work_wait_q);
3272 }
3273
3274 /**
3275  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3276  * @tgt:                ibmvfc target struct
3277  *
3278  * If an ADISC times out, send a cancel. If the cancel times
3279  * out, reset the CRQ. When the ADISC comes back as cancelled,
3280  * log back into the target.
3281  **/
3282 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3283 {
3284         struct ibmvfc_host *vhost = tgt->vhost;
3285         struct ibmvfc_event *evt;
3286         struct ibmvfc_tmf *tmf;
3287         unsigned long flags;
3288         int rc;
3289
3290         tgt_dbg(tgt, "ADISC timeout\n");
3291         spin_lock_irqsave(vhost->host->host_lock, flags);
3292         if (vhost->abort_threads >= disc_threads ||
3293             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3294             vhost->state != IBMVFC_INITIALIZING ||
3295             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3296                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3297                 return;
3298         }
3299
3300         vhost->abort_threads++;
3301         kref_get(&tgt->kref);
3302         evt = ibmvfc_get_event(vhost);
3303         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3304
3305         evt->tgt = tgt;
3306         tmf = &evt->iu.tmf;
3307         memset(tmf, 0, sizeof(*tmf));
3308         tmf->common.version = 1;
3309         tmf->common.opcode = IBMVFC_TMF_MAD;
3310         tmf->common.length = sizeof(*tmf);
3311         tmf->scsi_id = tgt->scsi_id;
3312         tmf->cancel_key = tgt->cancel_key;
3313
3314         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3315
3316         if (rc) {
3317                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3318                 vhost->abort_threads--;
3319                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3320                 __ibmvfc_reset_host(vhost);
3321         } else
3322                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3323         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3324 }
3325
3326 /**
3327  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3328  * @tgt:                ibmvfc target struct
3329  *
3330  * When sending an ADISC we end up with two timers running. The
3331  * first timer is the timer in the ibmvfc target struct. If this
3332  * fires, we send a cancel to the target. The second timer is the
3333  * timer on the ibmvfc event for the ADISC, which is longer. If that
3334  * fires, it means the ADISC timed out and our attempt to cancel it
3335  * also failed, so we need to reset the CRQ.
3336  **/
3337 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3338 {
3339         struct ibmvfc_passthru_mad *mad;
3340         struct ibmvfc_host *vhost = tgt->vhost;
3341         struct ibmvfc_event *evt;
3342
3343         if (vhost->discovery_threads >= disc_threads)
3344                 return;
3345
3346         kref_get(&tgt->kref);
3347         evt = ibmvfc_get_event(vhost);
3348         vhost->discovery_threads++;
3349         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3350         evt->tgt = tgt;
3351
3352         ibmvfc_init_passthru(evt);
3353         mad = &evt->iu.passthru;
3354         mad->iu.flags = IBMVFC_FC_ELS;
3355         mad->iu.scsi_id = tgt->scsi_id;
3356         mad->iu.cancel_key = tgt->cancel_key;
3357
3358         mad->fc_iu.payload[0] = IBMVFC_ADISC;
3359         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3360                sizeof(vhost->login_buf->resp.port_name));
3361         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3362                sizeof(vhost->login_buf->resp.node_name));
3363         mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
3364
3365         if (timer_pending(&tgt->timer))
3366                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3367         else {
3368                 tgt->timer.data = (unsigned long) tgt;
3369                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3370                 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3371                 add_timer(&tgt->timer);
3372         }
3373
3374         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3375         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3376                 vhost->discovery_threads--;
3377                 del_timer(&tgt->timer);
3378                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3379                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3380         } else
3381                 tgt_dbg(tgt, "Sent ADISC\n");
3382 }
3383
3384 /**
3385  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3386  * @evt:        ibmvfc event struct
3387  *
3388  **/
3389 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3390 {
3391         struct ibmvfc_target *tgt = evt->tgt;
3392         struct ibmvfc_host *vhost = evt->vhost;
3393         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3394         u32 status = rsp->common.status;
3395         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3396
3397         vhost->discovery_threads--;
3398         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3399         switch (status) {
3400         case IBMVFC_MAD_SUCCESS:
3401                 tgt_dbg(tgt, "Query Target succeeded\n");
3402                 tgt->new_scsi_id = rsp->scsi_id;
3403                 if (rsp->scsi_id != tgt->scsi_id)
3404                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3405                 else
3406                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3407                 break;
3408         case IBMVFC_MAD_DRIVER_FAILED:
3409                 break;
3410         case IBMVFC_MAD_CRQ_ERROR:
3411                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3412                 break;
3413         case IBMVFC_MAD_FAILED:
3414         default:
3415                 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3416                     rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3417                     rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
3418                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3419                 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3420                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3421                 else
3422                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3423
3424                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3425                         ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3426                         ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3427                         ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
3428                 break;
3429         };
3430
3431         kref_put(&tgt->kref, ibmvfc_release_tgt);
3432         ibmvfc_free_event(evt);
3433         wake_up(&vhost->work_wait_q);
3434 }
3435
3436 /**
3437  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3438  * @tgt:        ibmvfc target struct
3439  *
3440  **/
3441 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3442 {
3443         struct ibmvfc_query_tgt *query_tgt;
3444         struct ibmvfc_host *vhost = tgt->vhost;
3445         struct ibmvfc_event *evt;
3446
3447         if (vhost->discovery_threads >= disc_threads)
3448                 return;
3449
3450         kref_get(&tgt->kref);
3451         evt = ibmvfc_get_event(vhost);
3452         vhost->discovery_threads++;
3453         evt->tgt = tgt;
3454         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3455         query_tgt = &evt->iu.query_tgt;
3456         memset(query_tgt, 0, sizeof(*query_tgt));
3457         query_tgt->common.version = 1;
3458         query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
3459         query_tgt->common.length = sizeof(*query_tgt);
3460         query_tgt->wwpn = tgt->ids.port_name;
3461
3462         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3463         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3464                 vhost->discovery_threads--;
3465                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3466                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3467         } else
3468                 tgt_dbg(tgt, "Sent Query Target\n");
3469 }
3470
3471 /**
3472  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3473  * @vhost:              ibmvfc host struct
3474  * @scsi_id:    SCSI ID to allocate target for
3475  *
3476  * Returns:
3477  *      0 on success / other on failure
3478  **/
3479 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3480 {
3481         struct ibmvfc_target *tgt;
3482         unsigned long flags;
3483
3484         spin_lock_irqsave(vhost->host->host_lock, flags);
3485         list_for_each_entry(tgt, &vhost->targets, queue) {
3486                 if (tgt->scsi_id == scsi_id) {
3487                         if (tgt->need_login)
3488                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3489                         goto unlock_out;
3490                 }
3491         }
3492         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3493
3494         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3495         if (!tgt) {
3496                 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3497                         scsi_id);
3498                 return -ENOMEM;
3499         }
3500
3501         memset(tgt, 0, sizeof(*tgt));
3502         tgt->scsi_id = scsi_id;
3503         tgt->new_scsi_id = scsi_id;
3504         tgt->vhost = vhost;
3505         tgt->need_login = 1;
3506         tgt->cancel_key = vhost->task_set++;
3507         init_timer(&tgt->timer);
3508         kref_init(&tgt->kref);
3509         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3510         spin_lock_irqsave(vhost->host->host_lock, flags);
3511         list_add_tail(&tgt->queue, &vhost->targets);
3512
3513 unlock_out:
3514         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3515         return 0;
3516 }
3517
3518 /**
3519  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3520  * @vhost:              ibmvfc host struct
3521  *
3522  * Returns:
3523  *      0 on success / other on failure
3524  **/
3525 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3526 {
3527         int i, rc;
3528
3529         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3530                 rc = ibmvfc_alloc_target(vhost,
3531                                          vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
3532
3533         return rc;
3534 }
3535
3536 /**
3537  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3538  * @evt:        ibmvfc event struct
3539  *
3540  **/
3541 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3542 {
3543         struct ibmvfc_host *vhost = evt->vhost;
3544         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3545         u32 mad_status = rsp->common.status;
3546         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3547
3548         switch (mad_status) {
3549         case IBMVFC_MAD_SUCCESS:
3550                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3551                 vhost->num_targets = rsp->num_written;
3552                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3553                 break;
3554         case IBMVFC_MAD_FAILED:
3555                 level += ibmvfc_retry_host_init(vhost);
3556                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3557                            ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3558                 break;
3559         case IBMVFC_MAD_DRIVER_FAILED:
3560                 break;
3561         default:
3562                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3563                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3564                 break;
3565         }
3566
3567         ibmvfc_free_event(evt);
3568         wake_up(&vhost->work_wait_q);
3569 }
3570
3571 /**
3572  * ibmvfc_discover_targets - Send Discover Targets MAD
3573  * @vhost:      ibmvfc host struct
3574  *
3575  **/
3576 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3577 {
3578         struct ibmvfc_discover_targets *mad;
3579         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3580
3581         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3582         mad = &evt->iu.discover_targets;
3583         memset(mad, 0, sizeof(*mad));
3584         mad->common.version = 1;
3585         mad->common.opcode = IBMVFC_DISC_TARGETS;
3586         mad->common.length = sizeof(*mad);
3587         mad->bufflen = vhost->disc_buf_sz;
3588         mad->buffer.va = vhost->disc_buf_dma;
3589         mad->buffer.len = vhost->disc_buf_sz;
3590         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3591
3592         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3593                 ibmvfc_dbg(vhost, "Sent discover targets\n");
3594         else
3595                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3596 }
3597
3598 /**
3599  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
3600  * @evt:        ibmvfc event struct
3601  *
3602  **/
3603 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
3604 {
3605         struct ibmvfc_host *vhost = evt->vhost;
3606         u32 mad_status = evt->xfer_iu->npiv_login.common.status;
3607         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
3608         unsigned int npiv_max_sectors;
3609         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3610
3611         switch (mad_status) {
3612         case IBMVFC_MAD_SUCCESS:
3613                 ibmvfc_free_event(evt);
3614                 break;
3615         case IBMVFC_MAD_FAILED:
3616                 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3617                         level += ibmvfc_retry_host_init(vhost);
3618                 else
3619                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3620                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
3621                            ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3622                 ibmvfc_free_event(evt);
3623                 return;
3624         case IBMVFC_MAD_CRQ_ERROR:
3625                 ibmvfc_retry_host_init(vhost);
3626         case IBMVFC_MAD_DRIVER_FAILED:
3627                 ibmvfc_free_event(evt);
3628                 return;
3629         default:
3630                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
3631                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3632                 ibmvfc_free_event(evt);
3633                 return;
3634         }
3635
3636         vhost->client_migrated = 0;
3637
3638         if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
3639                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
3640                         rsp->flags);
3641                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3642                 wake_up(&vhost->work_wait_q);
3643                 return;
3644         }
3645
3646         if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
3647                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
3648                         rsp->max_cmds);
3649                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3650                 wake_up(&vhost->work_wait_q);
3651                 return;
3652         }
3653
3654         vhost->logged_in = 1;
3655         npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
3656         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
3657                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
3658                  rsp->drc_name, npiv_max_sectors);
3659
3660         fc_host_fabric_name(vhost->host) = rsp->node_name;
3661         fc_host_node_name(vhost->host) = rsp->node_name;
3662         fc_host_port_name(vhost->host) = rsp->port_name;
3663         fc_host_port_id(vhost->host) = rsp->scsi_id;
3664         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
3665         fc_host_supported_classes(vhost->host) = 0;
3666         if (rsp->service_parms.class1_parms[0] & 0x80000000)
3667                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
3668         if (rsp->service_parms.class2_parms[0] & 0x80000000)
3669                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
3670         if (rsp->service_parms.class3_parms[0] & 0x80000000)
3671                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
3672         fc_host_maxframe_size(vhost->host) =
3673                 rsp->service_parms.common.bb_rcv_sz & 0x0fff;
3674
3675         vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
3676         vhost->host->max_sectors = npiv_max_sectors;
3677         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
3678         wake_up(&vhost->work_wait_q);
3679 }
3680
3681 /**
3682  * ibmvfc_npiv_login - Sends NPIV login
3683  * @vhost:      ibmvfc host struct
3684  *
3685  **/
3686 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
3687 {
3688         struct ibmvfc_npiv_login_mad *mad;
3689         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3690
3691         ibmvfc_gather_partition_info(vhost);
3692         ibmvfc_set_login_info(vhost);
3693         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
3694
3695         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
3696         mad = &evt->iu.npiv_login;
3697         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
3698         mad->common.version = 1;
3699         mad->common.opcode = IBMVFC_NPIV_LOGIN;
3700         mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
3701         mad->buffer.va = vhost->login_buf_dma;
3702         mad->buffer.len = sizeof(*vhost->login_buf);
3703
3704         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3705
3706         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3707                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
3708         else
3709                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3710 };
3711
3712 /**
3713  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
3714  * @vhost:              ibmvfc host struct
3715  *
3716  **/
3717 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
3718 {
3719         struct ibmvfc_host *vhost = evt->vhost;
3720         u32 mad_status = evt->xfer_iu->npiv_logout.common.status;
3721
3722         ibmvfc_free_event(evt);
3723
3724         switch (mad_status) {
3725         case IBMVFC_MAD_SUCCESS:
3726                 if (list_empty(&vhost->sent) &&
3727                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
3728                         ibmvfc_init_host(vhost, 0);
3729                         return;
3730                 }
3731                 break;
3732         case IBMVFC_MAD_FAILED:
3733         case IBMVFC_MAD_NOT_SUPPORTED:
3734         case IBMVFC_MAD_CRQ_ERROR:
3735         case IBMVFC_MAD_DRIVER_FAILED:
3736         default:
3737                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
3738                 break;
3739         }
3740
3741         ibmvfc_hard_reset_host(vhost);
3742 }
3743
3744 /**
3745  * ibmvfc_npiv_logout - Issue an NPIV Logout
3746  * @vhost:              ibmvfc host struct
3747  *
3748  **/
3749 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
3750 {
3751         struct ibmvfc_npiv_logout_mad *mad;
3752         struct ibmvfc_event *evt;
3753
3754         evt = ibmvfc_get_event(vhost);
3755         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
3756
3757         mad = &evt->iu.npiv_logout;
3758         memset(mad, 0, sizeof(*mad));
3759         mad->common.version = 1;
3760         mad->common.opcode = IBMVFC_NPIV_LOGOUT;
3761         mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);
3762
3763         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
3764
3765         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3766                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
3767         else
3768                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3769 }
3770
3771 /**
3772  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
3773  * @vhost:              ibmvfc host struct
3774  *
3775  * Returns:
3776  *      1 if work to do / 0 if not
3777  **/
3778 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
3779 {
3780         struct ibmvfc_target *tgt;
3781
3782         list_for_each_entry(tgt, &vhost->targets, queue) {
3783                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
3784                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
3785                         return 1;
3786         }
3787
3788         return 0;
3789 }
3790
3791 /**
3792  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
3793  * @vhost:              ibmvfc host struct
3794  *
3795  * Returns:
3796  *      1 if work to do / 0 if not
3797  **/
3798 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
3799 {
3800         struct ibmvfc_target *tgt;
3801
3802         if (kthread_should_stop())
3803                 return 1;
3804         switch (vhost->action) {
3805         case IBMVFC_HOST_ACTION_NONE:
3806         case IBMVFC_HOST_ACTION_INIT_WAIT:
3807         case IBMVFC_HOST_ACTION_LOGO_WAIT:
3808                 return 0;
3809         case IBMVFC_HOST_ACTION_TGT_INIT:
3810         case IBMVFC_HOST_ACTION_QUERY_TGTS:
3811                 if (vhost->discovery_threads == disc_threads)
3812                         return 0;
3813                 list_for_each_entry(tgt, &vhost->targets, queue)
3814                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
3815                                 return 1;
3816                 list_for_each_entry(tgt, &vhost->targets, queue)
3817                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
3818                                 return 0;
3819                 return 1;
3820         case IBMVFC_HOST_ACTION_LOGO:
3821         case IBMVFC_HOST_ACTION_INIT:
3822         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
3823         case IBMVFC_HOST_ACTION_TGT_DEL:
3824         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
3825         case IBMVFC_HOST_ACTION_QUERY:
3826         default:
3827                 break;
3828         };
3829
3830         return 1;
3831 }
3832
3833 /**
3834  * ibmvfc_work_to_do - Is there task level work to do?
3835  * @vhost:              ibmvfc host struct
3836  *
3837  * Returns:
3838  *      1 if work to do / 0 if not
3839  **/
3840 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
3841 {
3842         unsigned long flags;
3843         int rc;
3844
3845         spin_lock_irqsave(vhost->host->host_lock, flags);
3846         rc = __ibmvfc_work_to_do(vhost);
3847         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3848         return rc;
3849 }
3850
3851 /**
3852  * ibmvfc_log_ae - Log async events if necessary
3853  * @vhost:              ibmvfc host struct
3854  * @events:             events to log
3855  *
3856  **/
3857 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
3858 {
3859         if (events & IBMVFC_AE_RSCN)
3860                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
3861         if ((events & IBMVFC_AE_LINKDOWN) &&
3862             vhost->state >= IBMVFC_HALTED)
3863                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
3864         if ((events & IBMVFC_AE_LINKUP) &&
3865             vhost->state == IBMVFC_INITIALIZING)
3866                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
3867 }
3868
3869 /**
3870  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
3871  * @tgt:                ibmvfc target struct
3872  *
3873  **/
3874 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
3875 {
3876         struct ibmvfc_host *vhost = tgt->vhost;
3877         struct fc_rport *rport;
3878         unsigned long flags;
3879
3880         tgt_dbg(tgt, "Adding rport\n");
3881         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
3882         spin_lock_irqsave(vhost->host->host_lock, flags);
3883
3884         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
3885                 tgt_dbg(tgt, "Deleting rport\n");
3886                 list_del(&tgt->queue);
3887                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3888                 fc_remote_port_delete(rport);
3889                 del_timer_sync(&tgt->timer);
3890                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3891                 return;
3892         }
3893
3894         if (rport) {
3895                 tgt_dbg(tgt, "rport add succeeded\n");
3896                 tgt->rport = rport;
3897                 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
3898                 rport->supported_classes = 0;
3899                 tgt->target_id = rport->scsi_target_id;
3900                 if (tgt->service_parms.class1_parms[0] & 0x80000000)
3901                         rport->supported_classes |= FC_COS_CLASS1;
3902                 if (tgt->service_parms.class2_parms[0] & 0x80000000)
3903                         rport->supported_classes |= FC_COS_CLASS2;
3904                 if (tgt->service_parms.class3_parms[0] & 0x80000000)
3905                         rport->supported_classes |= FC_COS_CLASS3;
3906         } else
3907                 tgt_dbg(tgt, "rport add failed\n");
3908         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3909 }
3910
3911 /**
3912  * ibmvfc_do_work - Do task level work
3913  * @vhost:              ibmvfc host struct
3914  *
3915  **/
3916 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
3917 {
3918         struct ibmvfc_target *tgt;
3919         unsigned long flags;
3920         struct fc_rport *rport;
3921
3922         ibmvfc_log_ae(vhost, vhost->events_to_log);
3923         spin_lock_irqsave(vhost->host->host_lock, flags);
3924         vhost->events_to_log = 0;
3925         switch (vhost->action) {
3926         case IBMVFC_HOST_ACTION_NONE:
3927         case IBMVFC_HOST_ACTION_LOGO_WAIT:
3928         case IBMVFC_HOST_ACTION_INIT_WAIT:
3929                 break;
3930         case IBMVFC_HOST_ACTION_LOGO:
3931                 vhost->job_step(vhost);
3932                 break;
3933         case IBMVFC_HOST_ACTION_INIT:
3934                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
3935                 if (vhost->delay_init) {
3936                         vhost->delay_init = 0;
3937                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3938                         ssleep(15);
3939                         return;
3940                 } else
3941                         vhost->job_step(vhost);
3942                 break;
3943         case IBMVFC_HOST_ACTION_QUERY:
3944                 list_for_each_entry(tgt, &vhost->targets, queue)
3945                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
3946                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
3947                 break;
3948         case IBMVFC_HOST_ACTION_QUERY_TGTS:
3949                 list_for_each_entry(tgt, &vhost->targets, queue) {
3950                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
3951                                 tgt->job_step(tgt);
3952                                 break;
3953                         }
3954                 }
3955
3956                 if (!ibmvfc_dev_init_to_do(vhost))
3957                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
3958                 break;
3959         case IBMVFC_HOST_ACTION_TGT_DEL:
3960         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
3961                 list_for_each_entry(tgt, &vhost->targets, queue) {
3962                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
3963                                 tgt_dbg(tgt, "Deleting rport\n");
3964                                 rport = tgt->rport;
3965                                 tgt->rport = NULL;
3966                                 list_del(&tgt->queue);
3967                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3968                                 if (rport)
3969                                         fc_remote_port_delete(rport);
3970                                 del_timer_sync(&tgt->timer);
3971                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3972                                 return;
3973                         }
3974                 }
3975
3976                 if (vhost->state == IBMVFC_INITIALIZING) {
3977                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
3978                                 if (vhost->reinit) {
3979                                         vhost->reinit = 0;
3980                                         scsi_block_requests(vhost->host);
3981                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
3982                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3983                                 } else {
3984                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
3985                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3986                                         wake_up(&vhost->init_wait_q);
3987                                         schedule_work(&vhost->rport_add_work_q);
3988                                         vhost->init_retries = 0;
3989                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3990                                         scsi_unblock_requests(vhost->host);
3991                                 }
3992
3993                                 return;
3994                         } else {
3995                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
3996                                 vhost->job_step = ibmvfc_discover_targets;
3997                         }
3998                 } else {
3999                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4000                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4001                         scsi_unblock_requests(vhost->host);
4002                         wake_up(&vhost->init_wait_q);
4003                         return;
4004                 }
4005                 break;
4006         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4007                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4008                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4009                 ibmvfc_alloc_targets(vhost);
4010                 spin_lock_irqsave(vhost->host->host_lock, flags);
4011                 break;
4012         case IBMVFC_HOST_ACTION_TGT_INIT:
4013                 list_for_each_entry(tgt, &vhost->targets, queue) {
4014                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4015                                 tgt->job_step(tgt);
4016                                 break;
4017                         }
4018                 }
4019
4020                 if (!ibmvfc_dev_init_to_do(vhost))
4021                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4022                 break;
4023         default:
4024                 break;
4025         };
4026
4027         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4028 }
4029
4030 /**
4031  * ibmvfc_work - Do task level work
4032  * @data:               ibmvfc host struct
4033  *
4034  * Returns:
4035  *      zero
4036  **/
4037 static int ibmvfc_work(void *data)
4038 {
4039         struct ibmvfc_host *vhost = data;
4040         int rc;
4041
4042         set_user_nice(current, -20);
4043
4044         while (1) {
4045                 rc = wait_event_interruptible(vhost->work_wait_q,
4046                                               ibmvfc_work_to_do(vhost));
4047
4048                 BUG_ON(rc);
4049
4050                 if (kthread_should_stop())
4051                         break;
4052
4053                 ibmvfc_do_work(vhost);
4054         }
4055
4056         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4057         return 0;
4058 }
4059
4060 /**
4061  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4062  * @vhost:      ibmvfc host struct
4063  *
4064  * Allocates a page for messages, maps it for dma, and registers
4065  * the crq with the hypervisor.
4066  *
4067  * Return value:
4068  *      zero on success / other on failure
4069  **/
4070 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4071 {
4072         int rc, retrc = -ENOMEM;
4073         struct device *dev = vhost->dev;
4074         struct vio_dev *vdev = to_vio_dev(dev);
4075         struct ibmvfc_crq_queue *crq = &vhost->crq;
4076
4077         ENTER;
4078         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4079
4080         if (!crq->msgs)
4081                 return -ENOMEM;
4082
4083         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4084         crq->msg_token = dma_map_single(dev, crq->msgs,
4085                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4086
4087         if (dma_mapping_error(dev, crq->msg_token))
4088                 goto map_failed;
4089
4090         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4091                                         crq->msg_token, PAGE_SIZE);
4092
4093         if (rc == H_RESOURCE)
4094                 /* maybe kexecing and resource is busy. try a reset */
4095                 retrc = rc = ibmvfc_reset_crq(vhost);
4096
4097         if (rc == H_CLOSED)
4098                 dev_warn(dev, "Partner adapter not ready\n");
4099         else if (rc) {
4100                 dev_warn(dev, "Error %d opening adapter\n", rc);
4101                 goto reg_crq_failed;
4102         }
4103
4104         retrc = 0;
4105
4106         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4107
4108         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4109                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4110                 goto req_irq_failed;
4111         }
4112
4113         if ((rc = vio_enable_interrupts(vdev))) {
4114                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4115                 goto req_irq_failed;
4116         }
4117
4118         crq->cur = 0;
4119         LEAVE;
4120         return retrc;
4121
4122 req_irq_failed:
4123         tasklet_kill(&vhost->tasklet);
4124         do {
4125                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4126         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4127 reg_crq_failed:
4128         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4129 map_failed:
4130         free_page((unsigned long)crq->msgs);
4131         return retrc;
4132 }
4133
4134 /**
4135  * ibmvfc_free_mem - Free memory for vhost
4136  * @vhost:      ibmvfc host struct
4137  *
4138  * Return value:
4139  *      none
4140  **/
4141 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4142 {
4143         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4144
4145         ENTER;
4146         mempool_destroy(vhost->tgt_pool);
4147         kfree(vhost->trace);
4148         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4149                           vhost->disc_buf_dma);
4150         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4151                           vhost->login_buf, vhost->login_buf_dma);
4152         dma_pool_destroy(vhost->sg_pool);
4153         dma_unmap_single(vhost->dev, async_q->msg_token,
4154                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4155         free_page((unsigned long)async_q->msgs);
4156         LEAVE;
4157 }
4158
4159 /**
4160  * ibmvfc_alloc_mem - Allocate memory for vhost
4161  * @vhost:      ibmvfc host struct
4162  *
4163  * Return value:
4164  *      0 on success / non-zero on failure
4165  **/
4166 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4167 {
4168         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4169         struct device *dev = vhost->dev;
4170
4171         ENTER;
4172         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4173         if (!async_q->msgs) {
4174                 dev_err(dev, "Couldn't allocate async queue.\n");
4175                 goto nomem;
4176         }
4177
4178         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4179         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4180                                             async_q->size * sizeof(*async_q->msgs),
4181                                             DMA_BIDIRECTIONAL);
4182
4183         if (dma_mapping_error(dev, async_q->msg_token)) {
4184                 dev_err(dev, "Failed to map async queue\n");
4185                 goto free_async_crq;
4186         }
4187
4188         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4189                                          SG_ALL * sizeof(struct srp_direct_buf),
4190                                          sizeof(struct srp_direct_buf), 0);
4191
4192         if (!vhost->sg_pool) {
4193                 dev_err(dev, "Failed to allocate sg pool\n");
4194                 goto unmap_async_crq;
4195         }
4196
4197         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4198                                               &vhost->login_buf_dma, GFP_KERNEL);
4199
4200         if (!vhost->login_buf) {
4201                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4202                 goto free_sg_pool;
4203         }
4204
4205         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4206         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4207                                              &vhost->disc_buf_dma, GFP_KERNEL);
4208
4209         if (!vhost->disc_buf) {
4210                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4211                 goto free_login_buffer;
4212         }
4213
4214         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4215                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4216
4217         if (!vhost->trace)
4218                 goto free_disc_buffer;
4219
4220         vhost->tgt_pool = mempool_create_kzalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4221                                                       sizeof(struct ibmvfc_target));
4222
4223         if (!vhost->tgt_pool) {
4224                 dev_err(dev, "Couldn't allocate target memory pool\n");
4225                 goto free_trace;
4226         }
4227
4228         LEAVE;
4229         return 0;
4230
4231 free_trace:
4232         kfree(vhost->trace);
4233 free_disc_buffer:
4234         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4235                           vhost->disc_buf_dma);
4236 free_login_buffer:
4237         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4238                           vhost->login_buf, vhost->login_buf_dma);
4239 free_sg_pool:
4240         dma_pool_destroy(vhost->sg_pool);
4241 unmap_async_crq:
4242         dma_unmap_single(dev, async_q->msg_token,
4243                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4244 free_async_crq:
4245         free_page((unsigned long)async_q->msgs);
4246 nomem:
4247         LEAVE;
4248         return -ENOMEM;
4249 }
4250
4251 /**
4252  * ibmvfc_rport_add_thread - Worker thread for rport adds
4253  * @work:       work struct
4254  *
4255  **/
4256 static void ibmvfc_rport_add_thread(struct work_struct *work)
4257 {
4258         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4259                                                  rport_add_work_q);
4260         struct ibmvfc_target *tgt;
4261         struct fc_rport *rport;
4262         unsigned long flags;
4263         int did_work;
4264
4265         ENTER;
4266         spin_lock_irqsave(vhost->host->host_lock, flags);
4267         do {
4268                 did_work = 0;
4269                 if (vhost->state != IBMVFC_ACTIVE)
4270                         break;
4271
4272                 list_for_each_entry(tgt, &vhost->targets, queue) {
4273                         if (tgt->add_rport) {
4274                                 did_work = 1;
4275                                 tgt->add_rport = 0;
4276                                 kref_get(&tgt->kref);
4277                                 rport = tgt->rport;
4278                                 if (!rport) {
4279                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4280                                         ibmvfc_tgt_add_rport(tgt);
4281                                 } else if (get_device(&rport->dev)) {
4282                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4283                                         tgt_dbg(tgt, "Setting rport roles\n");
4284                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4285                                         put_device(&rport->dev);
4286                                 }
4287
4288                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4289                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4290                                 break;
4291                         }
4292                 }
4293         } while(did_work);
4294
4295         if (vhost->state == IBMVFC_ACTIVE)
4296                 vhost->scan_complete = 1;
4297         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4298         LEAVE;
4299 }
4300
4301 /**
4302  * ibmvfc_probe - Adapter hot plug add entry point
4303  * @vdev:       vio device struct
4304  * @id: vio device id struct
4305  *
4306  * Return value:
4307  *      0 on success / non-zero on failure
4308  **/
4309 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4310 {
4311         struct ibmvfc_host *vhost;
4312         struct Scsi_Host *shost;
4313         struct device *dev = &vdev->dev;
4314         int rc = -ENOMEM;
4315
4316         ENTER;
4317         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4318         if (!shost) {
4319                 dev_err(dev, "Couldn't allocate host data\n");
4320                 goto out;
4321         }
4322
4323         shost->transportt = ibmvfc_transport_template;
4324         shost->can_queue = max_requests;
4325         shost->max_lun = max_lun;
4326         shost->max_id = max_targets;
4327         shost->max_sectors = IBMVFC_MAX_SECTORS;
4328         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4329         shost->unique_id = shost->host_no;
4330
4331         vhost = shost_priv(shost);
4332         INIT_LIST_HEAD(&vhost->sent);
4333         INIT_LIST_HEAD(&vhost->free);
4334         INIT_LIST_HEAD(&vhost->targets);
4335         sprintf(vhost->name, IBMVFC_NAME);
4336         vhost->host = shost;
4337         vhost->dev = dev;
4338         vhost->partition_number = -1;
4339         vhost->log_level = log_level;
4340         vhost->task_set = 1;
4341         strcpy(vhost->partition_name, "UNKNOWN");
4342         init_waitqueue_head(&vhost->work_wait_q);
4343         init_waitqueue_head(&vhost->init_wait_q);
4344         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4345
4346         if ((rc = ibmvfc_alloc_mem(vhost)))
4347                 goto free_scsi_host;
4348
4349         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4350                                          shost->host_no);
4351
4352         if (IS_ERR(vhost->work_thread)) {
4353                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4354                         PTR_ERR(vhost->work_thread));
4355                 goto free_host_mem;
4356         }
4357
4358         if ((rc = ibmvfc_init_crq(vhost))) {
4359                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4360                 goto kill_kthread;
4361         }
4362
4363         if ((rc = ibmvfc_init_event_pool(vhost))) {
4364                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4365                 goto release_crq;
4366         }
4367
4368         if ((rc = scsi_add_host(shost, dev)))
4369                 goto release_event_pool;
4370
4371         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4372                                            &ibmvfc_trace_attr))) {
4373                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4374                 goto remove_shost;
4375         }
4376
4377         dev_set_drvdata(dev, vhost);
4378         spin_lock(&ibmvfc_driver_lock);
4379         list_add_tail(&vhost->queue, &ibmvfc_head);
4380         spin_unlock(&ibmvfc_driver_lock);
4381
4382         ibmvfc_send_crq_init(vhost);
4383         scsi_scan_host(shost);
4384         return 0;
4385
4386 remove_shost:
4387         scsi_remove_host(shost);
4388 release_event_pool:
4389         ibmvfc_free_event_pool(vhost);
4390 release_crq:
4391         ibmvfc_release_crq_queue(vhost);
4392 kill_kthread:
4393         kthread_stop(vhost->work_thread);
4394 free_host_mem:
4395         ibmvfc_free_mem(vhost);
4396 free_scsi_host:
4397         scsi_host_put(shost);
4398 out:
4399         LEAVE;
4400         return rc;
4401 }
4402
4403 /**
4404  * ibmvfc_remove - Adapter hot plug remove entry point
4405  * @vdev:       vio device struct
4406  *
4407  * Return value:
4408  *      0
4409  **/
4410 static int ibmvfc_remove(struct vio_dev *vdev)
4411 {
4412         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4413         unsigned long flags;
4414
4415         ENTER;
4416         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4417         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4418         ibmvfc_wait_while_resetting(vhost);
4419         ibmvfc_release_crq_queue(vhost);
4420         kthread_stop(vhost->work_thread);
4421         fc_remove_host(vhost->host);
4422         scsi_remove_host(vhost->host);
4423
4424         spin_lock_irqsave(vhost->host->host_lock, flags);
4425         ibmvfc_purge_requests(vhost, DID_ERROR);
4426         ibmvfc_free_event_pool(vhost);
4427         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4428
4429         ibmvfc_free_mem(vhost);
4430         spin_lock(&ibmvfc_driver_lock);
4431         list_del(&vhost->queue);
4432         spin_unlock(&ibmvfc_driver_lock);
4433         scsi_host_put(vhost->host);
4434         LEAVE;
4435         return 0;
4436 }
4437
4438 /**
4439  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4440  * @vdev:       vio device struct
4441  *
4442  * Return value:
4443  *      Number of bytes the driver will need to DMA map at the same time in
4444  *      order to perform well.
4445  */
4446 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4447 {
4448         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4449         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4450 }
4451
4452 static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
4453         {"fcp", "IBM,vfc-client"},
4454         { "", "" }
4455 };
4456 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4457
4458 static struct vio_driver ibmvfc_driver = {
4459         .id_table = ibmvfc_device_table,
4460         .probe = ibmvfc_probe,
4461         .remove = ibmvfc_remove,
4462         .get_desired_dma = ibmvfc_get_desired_dma,
4463         .driver = {
4464                 .name = IBMVFC_NAME,
4465                 .owner = THIS_MODULE,
4466         }
4467 };
4468
4469 static struct fc_function_template ibmvfc_transport_functions = {
4470         .show_host_fabric_name = 1,
4471         .show_host_node_name = 1,
4472         .show_host_port_name = 1,
4473         .show_host_supported_classes = 1,
4474         .show_host_port_type = 1,
4475         .show_host_port_id = 1,
4476         .show_host_maxframe_size = 1,
4477
4478         .get_host_port_state = ibmvfc_get_host_port_state,
4479         .show_host_port_state = 1,
4480
4481         .get_host_speed = ibmvfc_get_host_speed,
4482         .show_host_speed = 1,
4483
4484         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4485         .terminate_rport_io = ibmvfc_terminate_rport_io,
4486
4487         .show_rport_maxframe_size = 1,
4488         .show_rport_supported_classes = 1,
4489
4490         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4491         .show_rport_dev_loss_tmo = 1,
4492
4493         .get_starget_node_name = ibmvfc_get_starget_node_name,
4494         .show_starget_node_name = 1,
4495
4496         .get_starget_port_name = ibmvfc_get_starget_port_name,
4497         .show_starget_port_name = 1,
4498
4499         .get_starget_port_id = ibmvfc_get_starget_port_id,
4500         .show_starget_port_id = 1,
4501 };
4502
4503 /**
4504  * ibmvfc_module_init - Initialize the ibmvfc module
4505  *
4506  * Return value:
4507  *      0 on success / other on failure
4508  **/
4509 static int __init ibmvfc_module_init(void)
4510 {
4511         int rc;
4512
4513         if (!firmware_has_feature(FW_FEATURE_VIO))
4514                 return -ENODEV;
4515
4516         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4517                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4518
4519         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4520         if (!ibmvfc_transport_template)
4521                 return -ENOMEM;
4522
4523         rc = vio_register_driver(&ibmvfc_driver);
4524         if (rc)
4525                 fc_release_transport(ibmvfc_transport_template);
4526         return rc;
4527 }
4528
4529 /**
4530  * ibmvfc_module_exit - Teardown the ibmvfc module
4531  *
4532  * Return value:
4533  *      nothing
4534  **/
4535 static void __exit ibmvfc_module_exit(void)
4536 {
4537         vio_unregister_driver(&ibmvfc_driver);
4538         fc_release_transport(ibmvfc_transport_template);
4539 }
4540
4541 module_init(ibmvfc_module_init);
4542 module_exit(ibmvfc_module_exit);