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/slab.h>
  32 #include <linux/of.h>
  33 #include <linux/pm.h>
  34 #include <linux/stringify.h>
  35 #include <asm/firmware.h>
  36 #include <asm/irq.h>
  37 #include <asm/vio.h>
  38 #include <scsi/scsi.h>
  39 #include <scsi/scsi_cmnd.h>
  40 #include <scsi/scsi_host.h>
  41 #include <scsi/scsi_device.h>
  42 #include <scsi/scsi_tcq.h>
  43 #include <scsi/scsi_transport_fc.h>
  44 #include <scsi/scsi_bsg_fc.h>
  45 #include "ibmvfc.h"
  46
  47 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  48 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  49 static u64 max_lun = IBMVFC_MAX_LUN;
  50 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  51 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  52 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  53 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  54 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  55 static LIST_HEAD(ibmvfc_head);
  56 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  57 static struct scsi_transport_template *ibmvfc_transport_template;
  58
  59 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  60 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  61 MODULE_LICENSE("GPL");
  62 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  63
  64 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  65 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  66                  "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  67 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  68 MODULE_PARM_DESC(default_timeout,
  69                  "Default timeout in seconds for initialization and EH commands. "
  70                  "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  71 module_param_named(max_requests, max_requests, uint, S_IRUGO);
  72 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  73                  "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  74 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
  75 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  76                  "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  77 module_param_named(max_targets, max_targets, uint, S_IRUGO);
  78 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  79                  "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  80 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
  81 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
  82                  "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
  83 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
  84 MODULE_PARM_DESC(debug, "Enable driver debug information. "
  85                  "[Default=" __stringify(IBMVFC_DEBUG) "]");
  86 module_param_named(log_level, log_level, uint, 0);
  87 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
  88                  "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
  89
  90 static const struct {
  91         u16 status;
  92         u16 error;
  93         u8 result;
  94         u8 retry;
  95         int log;
  96         char *name;
  97 } cmd_status [] = {
  98         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
  99         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
 100         { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
 101         { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
 102         { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
 103         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
 104         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
 105         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
 106         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
 107         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
 108         { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 109         { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 110         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 111         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 112
 113         { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 114         { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 115         { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 116         { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 117         { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 118         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 119         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 120         { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 121         { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 122         { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 123
 124         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 125         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 126         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 127         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 128         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 129         { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 130         { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 131         { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 132         { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 133         { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 134         { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 135
 136         { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 137 };
 138
 139 static void ibmvfc_npiv_login(struct ibmvfc_host *);
 140 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 141 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 142 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 143 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 144
 145 static const char *unknown_error = "unknown error";
 146
 147 #ifdef CONFIG_SCSI_IBMVFC_TRACE
 148 /**
 149  * ibmvfc_trc_start - Log a start trace entry
 150  * @evt:                ibmvfc event struct
 151  *
 152  **/
 153 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 154 {
 155         struct ibmvfc_host *vhost = evt->vhost;
 156         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 157         struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 158         struct ibmvfc_trace_entry *entry;
 159
 160         entry = &vhost->trace[vhost->trace_index++];
 161         entry->evt = evt;
 162         entry->time = jiffies;
 163         entry->fmt = evt->crq.format;
 164         entry->type = IBMVFC_TRC_START;
 165
 166         switch (entry->fmt) {
 167         case IBMVFC_CMD_FORMAT:
 168                 entry->op_code = vfc_cmd->iu.cdb[0];
 169                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 170                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 171                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 172                 entry->u.start.xfer_len = be32_to_cpu(vfc_cmd->iu.xfer_len);
 173                 break;
 174         case IBMVFC_MAD_FORMAT:
 175                 entry->op_code = be32_to_cpu(mad->opcode);
 176                 break;
 177         default:
 178                 break;
 179         };
 180 }
 181
 182 /**
 183  * ibmvfc_trc_end - Log an end trace entry
 184  * @evt:                ibmvfc event struct
 185  *
 186  **/
 187 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 188 {
 189         struct ibmvfc_host *vhost = evt->vhost;
 190         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 191         struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 192         struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
 193
 194         entry->evt = evt;
 195         entry->time = jiffies;
 196         entry->fmt = evt->crq.format;
 197         entry->type = IBMVFC_TRC_END;
 198
 199         switch (entry->fmt) {
 200         case IBMVFC_CMD_FORMAT:
 201                 entry->op_code = vfc_cmd->iu.cdb[0];
 202                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 203                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 204                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 205                 entry->u.end.status = be16_to_cpu(vfc_cmd->status);
 206                 entry->u.end.error = be16_to_cpu(vfc_cmd->error);
 207                 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
 208                 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
 209                 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
 210                 break;
 211         case IBMVFC_MAD_FORMAT:
 212                 entry->op_code = be32_to_cpu(mad->opcode);
 213                 entry->u.end.status = be16_to_cpu(mad->status);
 214                 break;
 215         default:
 216                 break;
 217
 218         };
 219 }
 220
 221 #else
 222 #define ibmvfc_trc_start(evt) do { } while (0)
 223 #define ibmvfc_trc_end(evt) do { } while (0)
 224 #endif
 225
 226 /**
 227  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 228  * @status:             status / error class
 229  * @error:              error
 230  *
 231  * Return value:
 232  *      index into cmd_status / -EINVAL on failure
 233  **/
 234 static int ibmvfc_get_err_index(u16 status, u16 error)
 235 {
 236         int i;
 237
 238         for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 239                 if ((cmd_status[i].status & status) == cmd_status[i].status &&
 240                     cmd_status[i].error == error)
 241                         return i;
 242
 243         return -EINVAL;
 244 }
 245
 246 /**
 247  * ibmvfc_get_cmd_error - Find the error description for the fcp response
 248  * @status:             status / error class
 249  * @error:              error
 250  *
 251  * Return value:
 252  *      error description string
 253  **/
 254 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 255 {
 256         int rc = ibmvfc_get_err_index(status, error);
 257         if (rc >= 0)
 258                 return cmd_status[rc].name;
 259         return unknown_error;
 260 }
 261
 262 /**
 263  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 264  * @vfc_cmd:    ibmvfc command struct
 265  *
 266  * Return value:
 267  *      SCSI result value to return for completed command
 268  **/
 269 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
 270 {
 271         int err;
 272         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
 273         int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
 274
 275         if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 276             ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 277              rsp->data.info.rsp_code))
 278                 return DID_ERROR << 16;
 279
 280         err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
 281         if (err >= 0)
 282                 return rsp->scsi_status | (cmd_status[err].result << 16);
 283         return rsp->scsi_status | (DID_ERROR << 16);
 284 }
 285
 286 /**
 287  * ibmvfc_retry_cmd - Determine if error status is retryable
 288  * @status:             status / error class
 289  * @error:              error
 290  *
 291  * Return value:
 292  *      1 if error should be retried / 0 if it should not
 293  **/
 294 static int ibmvfc_retry_cmd(u16 status, u16 error)
 295 {
 296         int rc = ibmvfc_get_err_index(status, error);
 297
 298         if (rc >= 0)
 299                 return cmd_status[rc].retry;
 300         return 1;
 301 }
 302
 303 static const char *unknown_fc_explain = "unknown fc explain";
 304
 305 static const struct {
 306         u16 fc_explain;
 307         char *name;
 308 } ls_explain [] = {
 309         { 0x00, "no additional explanation" },
 310         { 0x01, "service parameter error - options" },
 311         { 0x03, "service parameter error - initiator control" },
 312         { 0x05, "service parameter error - recipient control" },
 313         { 0x07, "service parameter error - received data field size" },
 314         { 0x09, "service parameter error - concurrent seq" },
 315         { 0x0B, "service parameter error - credit" },
 316         { 0x0D, "invalid N_Port/F_Port_Name" },
 317         { 0x0E, "invalid node/Fabric Name" },
 318         { 0x0F, "invalid common service parameters" },
 319         { 0x11, "invalid association header" },
 320         { 0x13, "association header required" },
 321         { 0x15, "invalid originator S_ID" },
 322         { 0x17, "invalid OX_ID-RX-ID combination" },
 323         { 0x19, "command (request) already in progress" },
 324         { 0x1E, "N_Port Login requested" },
 325         { 0x1F, "Invalid N_Port_ID" },
 326 };
 327
 328 static const struct {
 329         u16 fc_explain;
 330         char *name;
 331 } gs_explain [] = {
 332         { 0x00, "no additional explanation" },
 333         { 0x01, "port identifier not registered" },
 334         { 0x02, "port name not registered" },
 335         { 0x03, "node name not registered" },
 336         { 0x04, "class of service not registered" },
 337         { 0x06, "initial process associator not registered" },
 338         { 0x07, "FC-4 TYPEs not registered" },
 339         { 0x08, "symbolic port name not registered" },
 340         { 0x09, "symbolic node name not registered" },
 341         { 0x0A, "port type not registered" },
 342         { 0xF0, "authorization exception" },
 343         { 0xF1, "authentication exception" },
 344         { 0xF2, "data base full" },
 345         { 0xF3, "data base empty" },
 346         { 0xF4, "processing request" },
 347         { 0xF5, "unable to verify connection" },
 348         { 0xF6, "devices not in a common zone" },
 349 };
 350
 351 /**
 352  * ibmvfc_get_ls_explain - Return the FC Explain description text
 353  * @status:     FC Explain status
 354  *
 355  * Returns:
 356  *      error string
 357  **/
 358 static const char *ibmvfc_get_ls_explain(u16 status)
 359 {
 360         int i;
 361
 362         for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 363                 if (ls_explain[i].fc_explain == status)
 364                         return ls_explain[i].name;
 365
 366         return unknown_fc_explain;
 367 }
 368
 369 /**
 370  * ibmvfc_get_gs_explain - Return the FC Explain description text
 371  * @status:     FC Explain status
 372  *
 373  * Returns:
 374  *      error string
 375  **/
 376 static const char *ibmvfc_get_gs_explain(u16 status)
 377 {
 378         int i;
 379
 380         for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 381                 if (gs_explain[i].fc_explain == status)
 382                         return gs_explain[i].name;
 383
 384         return unknown_fc_explain;
 385 }
 386
 387 static const struct {
 388         enum ibmvfc_fc_type fc_type;
 389         char *name;
 390 } fc_type [] = {
 391         { IBMVFC_FABRIC_REJECT, "fabric reject" },
 392         { IBMVFC_PORT_REJECT, "port reject" },
 393         { IBMVFC_LS_REJECT, "ELS reject" },
 394         { IBMVFC_FABRIC_BUSY, "fabric busy" },
 395         { IBMVFC_PORT_BUSY, "port busy" },
 396         { IBMVFC_BASIC_REJECT, "basic reject" },
 397 };
 398
 399 static const char *unknown_fc_type = "unknown fc type";
 400
 401 /**
 402  * ibmvfc_get_fc_type - Return the FC Type description text
 403  * @status:     FC Type error status
 404  *
 405  * Returns:
 406  *      error string
 407  **/
 408 static const char *ibmvfc_get_fc_type(u16 status)
 409 {
 410         int i;
 411
 412         for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 413                 if (fc_type[i].fc_type == status)
 414                         return fc_type[i].name;
 415
 416         return unknown_fc_type;
 417 }
 418
 419 /**
 420  * ibmvfc_set_tgt_action - Set the next init action for the target
 421  * @tgt:                ibmvfc target struct
 422  * @action:             action to perform
 423  *
 424  **/
 425 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 426                                   enum ibmvfc_target_action action)
 427 {
 428         switch (tgt->action) {
 429         case IBMVFC_TGT_ACTION_DEL_RPORT:
 430                 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
 431                         tgt->action = action;
 432         case IBMVFC_TGT_ACTION_DELETED_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_INIT:
 505         case IBMVFC_HOST_ACTION_TGT_DEL:
 506                 switch (vhost->action) {
 507                 case IBMVFC_HOST_ACTION_RESET:
 508                 case IBMVFC_HOST_ACTION_REENABLE:
 509                         break;
 510                 default:
 511                         vhost->action = action;
 512                         break;
 513                 };
 514                 break;
 515         case IBMVFC_HOST_ACTION_LOGO:
 516         case IBMVFC_HOST_ACTION_QUERY_TGTS:
 517         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 518         case IBMVFC_HOST_ACTION_NONE:
 519         case IBMVFC_HOST_ACTION_RESET:
 520         case IBMVFC_HOST_ACTION_REENABLE:
 521         default:
 522                 vhost->action = action;
 523                 break;
 524         };
 525 }
 526
 527 /**
 528  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 529  * @vhost:              ibmvfc host struct
 530  *
 531  * Return value:
 532  *      nothing
 533  **/
 534 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 535 {
 536         if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
 537                 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 538                         scsi_block_requests(vhost->host);
 539                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 540                 }
 541         } else
 542                 vhost->reinit = 1;
 543
 544         wake_up(&vhost->work_wait_q);
 545 }
 546
 547 /**
 548  * ibmvfc_link_down - Handle a link down event from the adapter
 549  * @vhost:      ibmvfc host struct
 550  * @state:      ibmvfc host state to enter
 551  *
 552  **/
 553 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 554                              enum ibmvfc_host_state state)
 555 {
 556         struct ibmvfc_target *tgt;
 557
 558         ENTER;
 559         scsi_block_requests(vhost->host);
 560         list_for_each_entry(tgt, &vhost->targets, queue)
 561                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 562         ibmvfc_set_host_state(vhost, state);
 563         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 564         vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 565         wake_up(&vhost->work_wait_q);
 566         LEAVE;
 567 }
 568
 569 /**
 570  * ibmvfc_init_host - Start host initialization
 571  * @vhost:              ibmvfc host struct
 572  *
 573  * Return value:
 574  *      nothing
 575  **/
 576 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
 577 {
 578         struct ibmvfc_target *tgt;
 579
 580         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 581                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 582                         dev_err(vhost->dev,
 583                                 "Host initialization retries exceeded. Taking adapter offline\n");
 584                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 585                         return;
 586                 }
 587         }
 588
 589         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 590                 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
 591                 vhost->async_crq.cur = 0;
 592
 593                 list_for_each_entry(tgt, &vhost->targets, queue)
 594                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 595                 scsi_block_requests(vhost->host);
 596                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 597                 vhost->job_step = ibmvfc_npiv_login;
 598                 wake_up(&vhost->work_wait_q);
 599         }
 600 }
 601
 602 /**
 603  * ibmvfc_send_crq - Send a CRQ
 604  * @vhost:      ibmvfc host struct
 605  * @word1:      the first 64 bits of the data
 606  * @word2:      the second 64 bits of the data
 607  *
 608  * Return value:
 609  *      0 on success / other on failure
 610  **/
 611 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 612 {
 613         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 614         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 615 }
 616
 617 /**
 618  * ibmvfc_send_crq_init - Send a CRQ init message
 619  * @vhost:      ibmvfc host struct
 620  *
 621  * Return value:
 622  *      0 on success / other on failure
 623  **/
 624 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
 625 {
 626         ibmvfc_dbg(vhost, "Sending CRQ init\n");
 627         return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 628 }
 629
 630 /**
 631  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 632  * @vhost:      ibmvfc host struct
 633  *
 634  * Return value:
 635  *      0 on success / other on failure
 636  **/
 637 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 638 {
 639         ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 640         return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 641 }
 642
 643 /**
 644  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 645  * @vhost:      ibmvfc host struct
 646  *
 647  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 648  * the crq with the hypervisor.
 649  **/
 650 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 651 {
 652         long rc = 0;
 653         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 654         struct ibmvfc_crq_queue *crq = &vhost->crq;
 655
 656         ibmvfc_dbg(vhost, "Releasing CRQ\n");
 657         free_irq(vdev->irq, vhost);
 658         tasklet_kill(&vhost->tasklet);
 659         do {
 660                 if (rc)
 661                         msleep(100);
 662                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 663         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 664
 665         vhost->state = IBMVFC_NO_CRQ;
 666         vhost->logged_in = 0;
 667         dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 668         free_page((unsigned long)crq->msgs);
 669 }
 670
 671 /**
 672  * ibmvfc_reenable_crq_queue - reenables the CRQ
 673  * @vhost:      ibmvfc host struct
 674  *
 675  * Return value:
 676  *      0 on success / other on failure
 677  **/
 678 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 679 {
 680         int rc = 0;
 681         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 682
 683         /* Re-enable the CRQ */
 684         do {
 685                 if (rc)
 686                         msleep(100);
 687                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 688         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 689
 690         if (rc)
 691                 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 692
 693         return rc;
 694 }
 695
 696 /**
 697  * ibmvfc_reset_crq - resets a crq after a failure
 698  * @vhost:      ibmvfc host struct
 699  *
 700  * Return value:
 701  *      0 on success / other on failure
 702  **/
 703 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 704 {
 705         int rc = 0;
 706         unsigned long flags;
 707         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 708         struct ibmvfc_crq_queue *crq = &vhost->crq;
 709
 710         /* Close the CRQ */
 711         do {
 712                 if (rc)
 713                         msleep(100);
 714                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 715         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 716
 717         spin_lock_irqsave(vhost->host->host_lock, flags);
 718         vhost->state = IBMVFC_NO_CRQ;
 719         vhost->logged_in = 0;
 720         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
 721
 722         /* Clean out the queue */
 723         memset(crq->msgs, 0, PAGE_SIZE);
 724         crq->cur = 0;
 725
 726         /* And re-open it again */
 727         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 728                                 crq->msg_token, PAGE_SIZE);
 729
 730         if (rc == H_CLOSED)
 731                 /* Adapter is good, but other end is not ready */
 732                 dev_warn(vhost->dev, "Partner adapter not ready\n");
 733         else if (rc != 0)
 734                 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 735         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 736
 737         return rc;
 738 }
 739
 740 /**
 741  * ibmvfc_valid_event - Determines if event is valid.
 742  * @pool:       event_pool that contains the event
 743  * @evt:        ibmvfc event to be checked for validity
 744  *
 745  * Return value:
 746  *      1 if event is valid / 0 if event is not valid
 747  **/
 748 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
 749                               struct ibmvfc_event *evt)
 750 {
 751         int index = evt - pool->events;
 752         if (index < 0 || index >= pool->size)   /* outside of bounds */
 753                 return 0;
 754         if (evt != pool->events + index)        /* unaligned */
 755                 return 0;
 756         return 1;
 757 }
 758
 759 /**
 760  * ibmvfc_free_event - Free the specified event
 761  * @evt:        ibmvfc_event to be freed
 762  *
 763  **/
 764 static void ibmvfc_free_event(struct ibmvfc_event *evt)
 765 {
 766         struct ibmvfc_host *vhost = evt->vhost;
 767         struct ibmvfc_event_pool *pool = &vhost->pool;
 768
 769         BUG_ON(!ibmvfc_valid_event(pool, evt));
 770         BUG_ON(atomic_inc_return(&evt->free) != 1);
 771         list_add_tail(&evt->queue, &vhost->free);
 772 }
 773
 774 /**
 775  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
 776  * @evt:        ibmvfc event struct
 777  *
 778  * This function does not setup any error status, that must be done
 779  * before this function gets called.
 780  **/
 781 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
 782 {
 783         struct scsi_cmnd *cmnd = evt->cmnd;
 784
 785         if (cmnd) {
 786                 scsi_dma_unmap(cmnd);
 787                 cmnd->scsi_done(cmnd);
 788         }
 789
 790         if (evt->eh_comp)
 791                 complete(evt->eh_comp);
 792
 793         ibmvfc_free_event(evt);
 794 }
 795
 796 /**
 797  * ibmvfc_fail_request - Fail request with specified error code
 798  * @evt:                ibmvfc event struct
 799  * @error_code: error code to fail request with
 800  *
 801  * Return value:
 802  *      none
 803  **/
 804 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
 805 {
 806         if (evt->cmnd) {
 807                 evt->cmnd->result = (error_code << 16);
 808                 evt->done = ibmvfc_scsi_eh_done;
 809         } else
 810                 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
 811
 812         list_del(&evt->queue);
 813         del_timer(&evt->timer);
 814         ibmvfc_trc_end(evt);
 815         evt->done(evt);
 816 }
 817
 818 /**
 819  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
 820  * @vhost:              ibmvfc host struct
 821  * @error_code: error code to fail requests with
 822  *
 823  * Return value:
 824  *      none
 825  **/
 826 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
 827 {
 828         struct ibmvfc_event *evt, *pos;
 829
 830         ibmvfc_dbg(vhost, "Purging all requests\n");
 831         list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
 832                 ibmvfc_fail_request(evt, error_code);
 833 }
 834
 835 /**
 836  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
 837  * @vhost:      struct ibmvfc host to reset
 838  **/
 839 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
 840 {
 841         ibmvfc_purge_requests(vhost, DID_ERROR);
 842         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
 843         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
 844 }
 845
 846 /**
 847  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
 848  * @vhost:      struct ibmvfc host to reset
 849  **/
 850 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
 851 {
 852         if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
 853             !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 854                 scsi_block_requests(vhost->host);
 855                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
 856                 vhost->job_step = ibmvfc_npiv_logout;
 857                 wake_up(&vhost->work_wait_q);
 858         } else
 859                 ibmvfc_hard_reset_host(vhost);
 860 }
 861
 862 /**
 863  * ibmvfc_reset_host - Reset the connection to the server
 864  * @vhost:      ibmvfc host struct
 865  **/
 866 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
 867 {
 868         unsigned long flags;
 869
 870         spin_lock_irqsave(vhost->host->host_lock, flags);
 871         __ibmvfc_reset_host(vhost);
 872         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 873 }
 874
 875 /**
 876  * ibmvfc_retry_host_init - Retry host initialization if allowed
 877  * @vhost:      ibmvfc host struct
 878  *
 879  * Returns: 1 if init will be retried / 0 if not
 880  *
 881  **/
 882 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
 883 {
 884         int retry = 0;
 885
 886         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 887                 vhost->delay_init = 1;
 888                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 889                         dev_err(vhost->dev,
 890                                 "Host initialization retries exceeded. Taking adapter offline\n");
 891                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 892                 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
 893                         __ibmvfc_reset_host(vhost);
 894                 else {
 895                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 896                         retry = 1;
 897                 }
 898         }
 899
 900         wake_up(&vhost->work_wait_q);
 901         return retry;
 902 }
 903
 904 /**
 905  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
 906  * @starget:    scsi target struct
 907  *
 908  * Return value:
 909  *      ibmvfc_target struct / NULL if not found
 910  **/
 911 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
 912 {
 913         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 914         struct ibmvfc_host *vhost = shost_priv(shost);
 915         struct ibmvfc_target *tgt;
 916
 917         list_for_each_entry(tgt, &vhost->targets, queue)
 918                 if (tgt->target_id == starget->id) {
 919                         kref_get(&tgt->kref);
 920                         return tgt;
 921                 }
 922         return NULL;
 923 }
 924
 925 /**
 926  * ibmvfc_get_target - Find the specified scsi_target
 927  * @starget:    scsi target struct
 928  *
 929  * Return value:
 930  *      ibmvfc_target struct / NULL if not found
 931  **/
 932 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
 933 {
 934         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 935         struct ibmvfc_target *tgt;
 936         unsigned long flags;
 937
 938         spin_lock_irqsave(shost->host_lock, flags);
 939         tgt = __ibmvfc_get_target(starget);
 940         spin_unlock_irqrestore(shost->host_lock, flags);
 941         return tgt;
 942 }
 943
 944 /**
 945  * ibmvfc_get_host_speed - Get host port speed
 946  * @shost:              scsi host struct
 947  *
 948  * Return value:
 949  *      none
 950  **/
 951 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
 952 {
 953         struct ibmvfc_host *vhost = shost_priv(shost);
 954         unsigned long flags;
 955
 956         spin_lock_irqsave(shost->host_lock, flags);
 957         if (vhost->state == IBMVFC_ACTIVE) {
 958                 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
 959                 case 1:
 960                         fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
 961                         break;
 962                 case 2:
 963                         fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
 964                         break;
 965                 case 4:
 966                         fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
 967                         break;
 968                 case 8:
 969                         fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
 970                         break;
 971                 case 10:
 972                         fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
 973                         break;
 974                 case 16:
 975                         fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
 976                         break;
 977                 default:
 978                         ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
 979                                    be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
 980                         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 981                         break;
 982                 }
 983         } else
 984                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 985         spin_unlock_irqrestore(shost->host_lock, flags);
 986 }
 987
 988 /**
 989  * ibmvfc_get_host_port_state - Get host port state
 990  * @shost:              scsi host struct
 991  *
 992  * Return value:
 993  *      none
 994  **/
 995 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
 996 {
 997         struct ibmvfc_host *vhost = shost_priv(shost);
 998         unsigned long flags;
 999
1000         spin_lock_irqsave(shost->host_lock, flags);
1001         switch (vhost->state) {
1002         case IBMVFC_INITIALIZING:
1003         case IBMVFC_ACTIVE:
1004                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1005                 break;
1006         case IBMVFC_LINK_DOWN:
1007                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1008                 break;
1009         case IBMVFC_LINK_DEAD:
1010         case IBMVFC_HOST_OFFLINE:
1011                 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1012                 break;
1013         case IBMVFC_HALTED:
1014                 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1015                 break;
1016         case IBMVFC_NO_CRQ:
1017                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1018                 break;
1019         default:
1020                 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1021                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1022                 break;
1023         }
1024         spin_unlock_irqrestore(shost->host_lock, flags);
1025 }
1026
1027 /**
1028  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1029  * @rport:              rport struct
1030  * @timeout:    timeout value
1031  *
1032  * Return value:
1033  *      none
1034  **/
1035 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1036 {
1037         if (timeout)
1038                 rport->dev_loss_tmo = timeout;
1039         else
1040                 rport->dev_loss_tmo = 1;
1041 }
1042
1043 /**
1044  * ibmvfc_release_tgt - Free memory allocated for a target
1045  * @kref:               kref struct
1046  *
1047  **/
1048 static void ibmvfc_release_tgt(struct kref *kref)
1049 {
1050         struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1051         kfree(tgt);
1052 }
1053
1054 /**
1055  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1056  * @starget:    scsi target struct
1057  *
1058  * Return value:
1059  *      none
1060  **/
1061 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1062 {
1063         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1064         fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1065         if (tgt)
1066                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1067 }
1068
1069 /**
1070  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1071  * @starget:    scsi target struct
1072  *
1073  * Return value:
1074  *      none
1075  **/
1076 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1077 {
1078         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1079         fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1080         if (tgt)
1081                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1082 }
1083
1084 /**
1085  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1086  * @starget:    scsi target struct
1087  *
1088  * Return value:
1089  *      none
1090  **/
1091 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1092 {
1093         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1094         fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1095         if (tgt)
1096                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1097 }
1098
1099 /**
1100  * ibmvfc_wait_while_resetting - Wait while the host resets
1101  * @vhost:              ibmvfc host struct
1102  *
1103  * Return value:
1104  *      0 on success / other on failure
1105  **/
1106 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1107 {
1108         long timeout = wait_event_timeout(vhost->init_wait_q,
1109                                           ((vhost->state == IBMVFC_ACTIVE ||
1110                                             vhost->state == IBMVFC_HOST_OFFLINE ||
1111                                             vhost->state == IBMVFC_LINK_DEAD) &&
1112                                            vhost->action == IBMVFC_HOST_ACTION_NONE),
1113                                           (init_timeout * HZ));
1114
1115         return timeout ? 0 : -EIO;
1116 }
1117
1118 /**
1119  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1120  * @shost:              scsi host struct
1121  *
1122  * Return value:
1123  *      0 on success / other on failure
1124  **/
1125 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1126 {
1127         struct ibmvfc_host *vhost = shost_priv(shost);
1128
1129         dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1130         ibmvfc_reset_host(vhost);
1131         return ibmvfc_wait_while_resetting(vhost);
1132 }
1133
1134 /**
1135  * ibmvfc_gather_partition_info - Gather info about the LPAR
1136  *
1137  * Return value:
1138  *      none
1139  **/
1140 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1141 {
1142         struct device_node *rootdn;
1143         const char *name;
1144         const unsigned int *num;
1145
1146         rootdn = of_find_node_by_path("/");
1147         if (!rootdn)
1148                 return;
1149
1150         name = of_get_property(rootdn, "ibm,partition-name", NULL);
1151         if (name)
1152                 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1153         num = of_get_property(rootdn, "ibm,partition-no", NULL);
1154         if (num)
1155                 vhost->partition_number = *num;
1156         of_node_put(rootdn);
1157 }
1158
1159 /**
1160  * ibmvfc_set_login_info - Setup info for NPIV login
1161  * @vhost:      ibmvfc host struct
1162  *
1163  * Return value:
1164  *      none
1165  **/
1166 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1167 {
1168         struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1169         struct device_node *of_node = vhost->dev->of_node;
1170         const char *location;
1171
1172         memset(login_info, 0, sizeof(*login_info));
1173
1174         login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1175         login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1176         login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1177         login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1178         login_info->partition_num = cpu_to_be32(vhost->partition_number);
1179         login_info->vfc_frame_version = cpu_to_be32(1);
1180         login_info->fcp_version = cpu_to_be16(3);
1181         login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1182         if (vhost->client_migrated)
1183                 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1184
1185         login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1186         login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE);
1187         login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1188         login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs));
1189         strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1190         strncpy(login_info->device_name,
1191                 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1192
1193         location = of_get_property(of_node, "ibm,loc-code", NULL);
1194         location = location ? location : dev_name(vhost->dev);
1195         strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1196 }
1197
1198 /**
1199  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1200  * @vhost:      ibmvfc host who owns the event pool
1201  *
1202  * Returns zero on success.
1203  **/
1204 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1205 {
1206         int i;
1207         struct ibmvfc_event_pool *pool = &vhost->pool;
1208
1209         ENTER;
1210         pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1211         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1212         if (!pool->events)
1213                 return -ENOMEM;
1214
1215         pool->iu_storage = dma_alloc_coherent(vhost->dev,
1216                                               pool->size * sizeof(*pool->iu_storage),
1217                                               &pool->iu_token, 0);
1218
1219         if (!pool->iu_storage) {
1220                 kfree(pool->events);
1221                 return -ENOMEM;
1222         }
1223
1224         for (i = 0; i < pool->size; ++i) {
1225                 struct ibmvfc_event *evt = &pool->events[i];
1226                 atomic_set(&evt->free, 1);
1227                 evt->crq.valid = 0x80;
1228                 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
1229                 evt->xfer_iu = pool->iu_storage + i;
1230                 evt->vhost = vhost;
1231                 evt->ext_list = NULL;
1232                 list_add_tail(&evt->queue, &vhost->free);
1233         }
1234
1235         LEAVE;
1236         return 0;
1237 }
1238
1239 /**
1240  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1241  * @vhost:      ibmvfc host who owns the event pool
1242  *
1243  **/
1244 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1245 {
1246         int i;
1247         struct ibmvfc_event_pool *pool = &vhost->pool;
1248
1249         ENTER;
1250         for (i = 0; i < pool->size; ++i) {
1251                 list_del(&pool->events[i].queue);
1252                 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1253                 if (pool->events[i].ext_list)
1254                         dma_pool_free(vhost->sg_pool,
1255                                       pool->events[i].ext_list,
1256                                       pool->events[i].ext_list_token);
1257         }
1258
1259         kfree(pool->events);
1260         dma_free_coherent(vhost->dev,
1261                           pool->size * sizeof(*pool->iu_storage),
1262                           pool->iu_storage, pool->iu_token);
1263         LEAVE;
1264 }
1265
1266 /**
1267  * ibmvfc_get_event - Gets the next free event in pool
1268  * @vhost:      ibmvfc host struct
1269  *
1270  * Returns a free event from the pool.
1271  **/
1272 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1273 {
1274         struct ibmvfc_event *evt;
1275
1276         BUG_ON(list_empty(&vhost->free));
1277         evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1278         atomic_set(&evt->free, 0);
1279         list_del(&evt->queue);
1280         return evt;
1281 }
1282
1283 /**
1284  * ibmvfc_init_event - Initialize fields in an event struct that are always
1285  *                              required.
1286  * @evt:        The event
1287  * @done:       Routine to call when the event is responded to
1288  * @format:     SRP or MAD format
1289  **/
1290 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1291                               void (*done) (struct ibmvfc_event *), u8 format)
1292 {
1293         evt->cmnd = NULL;
1294         evt->sync_iu = NULL;
1295         evt->crq.format = format;
1296         evt->done = done;
1297         evt->eh_comp = NULL;
1298 }
1299
1300 /**
1301  * ibmvfc_map_sg_list - Initialize scatterlist
1302  * @scmd:       scsi command struct
1303  * @nseg:       number of scatterlist segments
1304  * @md: memory descriptor list to initialize
1305  **/
1306 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1307                                struct srp_direct_buf *md)
1308 {
1309         int i;
1310         struct scatterlist *sg;
1311
1312         scsi_for_each_sg(scmd, sg, nseg, i) {
1313                 md[i].va = cpu_to_be64(sg_dma_address(sg));
1314                 md[i].len = cpu_to_be32(sg_dma_len(sg));
1315                 md[i].key = 0;
1316         }
1317 }
1318
1319 /**
1320  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1321  * @scmd:               Scsi_Cmnd with the scatterlist
1322  * @evt:                ibmvfc event struct
1323  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1324  * @dev:                device for which to map dma memory
1325  *
1326  * Returns:
1327  *      0 on success / non-zero on failure
1328  **/
1329 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1330                               struct ibmvfc_event *evt,
1331                               struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1332 {
1333
1334         int sg_mapped;
1335         struct srp_direct_buf *data = &vfc_cmd->ioba;
1336         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1337
1338         sg_mapped = scsi_dma_map(scmd);
1339         if (!sg_mapped) {
1340                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1341                 return 0;
1342         } else if (unlikely(sg_mapped < 0)) {
1343                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1344                         scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1345                 return sg_mapped;
1346         }
1347
1348         if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1349                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1350                 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1351         } else {
1352                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1353                 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1354         }
1355
1356         if (sg_mapped == 1) {
1357                 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1358                 return 0;
1359         }
1360
1361         vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1362
1363         if (!evt->ext_list) {
1364                 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1365                                                &evt->ext_list_token);
1366
1367                 if (!evt->ext_list) {
1368                         scsi_dma_unmap(scmd);
1369                         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1370                                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1371                         return -ENOMEM;
1372                 }
1373         }
1374
1375         ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1376
1377         data->va = cpu_to_be64(evt->ext_list_token);
1378         data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1379         data->key = 0;
1380         return 0;
1381 }
1382
1383 /**
1384  * ibmvfc_timeout - Internal command timeout handler
1385  * @evt:        struct ibmvfc_event that timed out
1386  *
1387  * Called when an internally generated command times out
1388  **/
1389 static void ibmvfc_timeout(struct ibmvfc_event *evt)
1390 {
1391         struct ibmvfc_host *vhost = evt->vhost;
1392         dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1393         ibmvfc_reset_host(vhost);
1394 }
1395
1396 /**
1397  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1398  * @evt:                event to be sent
1399  * @vhost:              ibmvfc host struct
1400  * @timeout:    timeout in seconds - 0 means do not time command
1401  *
1402  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1403  **/
1404 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1405                              struct ibmvfc_host *vhost, unsigned long timeout)
1406 {
1407         __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1408         int rc;
1409
1410         /* Copy the IU into the transfer area */
1411         *evt->xfer_iu = evt->iu;
1412         if (evt->crq.format == IBMVFC_CMD_FORMAT)
1413                 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1414         else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1415                 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1416         else
1417                 BUG();
1418
1419         list_add_tail(&evt->queue, &vhost->sent);
1420         init_timer(&evt->timer);
1421
1422         if (timeout) {
1423                 evt->timer.data = (unsigned long) evt;
1424                 evt->timer.expires = jiffies + (timeout * HZ);
1425                 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1426                 add_timer(&evt->timer);
1427         }
1428
1429         mb();
1430
1431         if ((rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1432                                   be64_to_cpu(crq_as_u64[1])))) {
1433                 list_del(&evt->queue);
1434                 del_timer(&evt->timer);
1435
1436                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1437                  * Firmware will send a CRQ with a transport event (0xFF) to
1438                  * tell this client what has happened to the transport. This
1439                  * will be handled in ibmvfc_handle_crq()
1440                  */
1441                 if (rc == H_CLOSED) {
1442                         if (printk_ratelimit())
1443                                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1444                         if (evt->cmnd)
1445                                 scsi_dma_unmap(evt->cmnd);
1446                         ibmvfc_free_event(evt);
1447                         return SCSI_MLQUEUE_HOST_BUSY;
1448                 }
1449
1450                 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1451                 if (evt->cmnd) {
1452                         evt->cmnd->result = DID_ERROR << 16;
1453                         evt->done = ibmvfc_scsi_eh_done;
1454                 } else
1455                         evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1456
1457                 evt->done(evt);
1458         } else
1459                 ibmvfc_trc_start(evt);
1460
1461         return 0;
1462 }
1463
1464 /**
1465  * ibmvfc_log_error - Log an error for the failed command if appropriate
1466  * @evt:        ibmvfc event to log
1467  *
1468  **/
1469 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1470 {
1471         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1472         struct ibmvfc_host *vhost = evt->vhost;
1473         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1474         struct scsi_cmnd *cmnd = evt->cmnd;
1475         const char *err = unknown_error;
1476         int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1477         int logerr = 0;
1478         int rsp_code = 0;
1479
1480         if (index >= 0) {
1481                 logerr = cmd_status[index].log;
1482                 err = cmd_status[index].name;
1483         }
1484
1485         if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1486                 return;
1487
1488         if (rsp->flags & FCP_RSP_LEN_VALID)
1489                 rsp_code = rsp->data.info.rsp_code;
1490
1491         scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1492                     "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1493                     cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1494                     rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1495 }
1496
1497 /**
1498  * ibmvfc_relogin - Log back into the specified device
1499  * @sdev:       scsi device struct
1500  *
1501  **/
1502 static void ibmvfc_relogin(struct scsi_device *sdev)
1503 {
1504         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1505         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1506         struct ibmvfc_target *tgt;
1507
1508         list_for_each_entry(tgt, &vhost->targets, queue) {
1509                 if (rport == tgt->rport) {
1510                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1511                         break;
1512                 }
1513         }
1514
1515         ibmvfc_reinit_host(vhost);
1516 }
1517
1518 /**
1519  * ibmvfc_scsi_done - Handle responses from commands
1520  * @evt:        ibmvfc event to be handled
1521  *
1522  * Used as a callback when sending scsi cmds.
1523  **/
1524 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1525 {
1526         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1527         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1528         struct scsi_cmnd *cmnd = evt->cmnd;
1529         u32 rsp_len = 0;
1530         u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1531
1532         if (cmnd) {
1533                 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1534                         scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1535                 else if (rsp->flags & FCP_RESID_UNDER)
1536                         scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1537                 else
1538                         scsi_set_resid(cmnd, 0);
1539
1540                 if (vfc_cmd->status) {
1541                         cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1542
1543                         if (rsp->flags & FCP_RSP_LEN_VALID)
1544                                 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1545                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1546                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1547                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1548                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1549                         if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1550                             (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1551                                 ibmvfc_relogin(cmnd->device);
1552
1553                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1554                                 cmnd->result = (DID_ERROR << 16);
1555
1556                         ibmvfc_log_error(evt);
1557                 }
1558
1559                 if (!cmnd->result &&
1560                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1561                         cmnd->result = (DID_ERROR << 16);
1562
1563                 scsi_dma_unmap(cmnd);
1564                 cmnd->scsi_done(cmnd);
1565         }
1566
1567         if (evt->eh_comp)
1568                 complete(evt->eh_comp);
1569
1570         ibmvfc_free_event(evt);
1571 }
1572
1573 /**
1574  * ibmvfc_host_chkready - Check if the host can accept commands
1575  * @vhost:       struct ibmvfc host
1576  *
1577  * Returns:
1578  *      1 if host can accept command / 0 if not
1579  **/
1580 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1581 {
1582         int result = 0;
1583
1584         switch (vhost->state) {
1585         case IBMVFC_LINK_DEAD:
1586         case IBMVFC_HOST_OFFLINE:
1587                 result = DID_NO_CONNECT << 16;
1588                 break;
1589         case IBMVFC_NO_CRQ:
1590         case IBMVFC_INITIALIZING:
1591         case IBMVFC_HALTED:
1592         case IBMVFC_LINK_DOWN:
1593                 result = DID_REQUEUE << 16;
1594                 break;
1595         case IBMVFC_ACTIVE:
1596                 result = 0;
1597                 break;
1598         };
1599
1600         return result;
1601 }
1602
1603 /**
1604  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1605  * @cmnd:       struct scsi_cmnd to be executed
1606  * @done:       Callback function to be called when cmnd is completed
1607  *
1608  * Returns:
1609  *      0 on success / other on failure
1610  **/
1611 static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
1612                                void (*done) (struct scsi_cmnd *))
1613 {
1614         struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1615         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1616         struct ibmvfc_cmd *vfc_cmd;
1617         struct ibmvfc_event *evt;
1618         u8 tag[2];
1619         int rc;
1620
1621         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1622             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1623                 cmnd->result = rc;
1624                 done(cmnd);
1625                 return 0;
1626         }
1627
1628         cmnd->result = (DID_OK << 16);
1629         evt = ibmvfc_get_event(vhost);
1630         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1631         evt->cmnd = cmnd;
1632         cmnd->scsi_done = done;
1633         vfc_cmd = &evt->iu.cmd;
1634         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1635         vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1636         vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1637         vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1638         vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu));
1639         vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1640         vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata);
1641         vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1642         vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1643         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1644         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1645
1646         if (cmnd->flags & SCMD_TAGGED) {
1647                 vfc_cmd->task_tag = cpu_to_be64(cmnd->tag);
1648                 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1649         }
1650
1651         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1652                 return ibmvfc_send_event(evt, vhost, 0);
1653
1654         ibmvfc_free_event(evt);
1655         if (rc == -ENOMEM)
1656                 return SCSI_MLQUEUE_HOST_BUSY;
1657
1658         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1659                 scmd_printk(KERN_ERR, cmnd,
1660                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1661
1662         cmnd->result = DID_ERROR << 16;
1663         done(cmnd);
1664         return 0;
1665 }
1666
1667 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1668
1669 /**
1670  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1671  * @evt:        ibmvfc event struct
1672  *
1673  **/
1674 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1675 {
1676         /* copy the response back */
1677         if (evt->sync_iu)
1678                 *evt->sync_iu = *evt->xfer_iu;
1679
1680         complete(&evt->comp);
1681 }
1682
1683 /**
1684  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1685  * @evt:        struct ibmvfc_event
1686  *
1687  **/
1688 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1689 {
1690         struct ibmvfc_host *vhost = evt->vhost;
1691
1692         ibmvfc_free_event(evt);
1693         vhost->aborting_passthru = 0;
1694         dev_info(vhost->dev, "Passthru command cancelled\n");
1695 }
1696
1697 /**
1698  * ibmvfc_bsg_timeout - Handle a BSG timeout
1699  * @job:        struct fc_bsg_job that timed out
1700  *
1701  * Returns:
1702  *      0 on success / other on failure
1703  **/
1704 static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
1705 {
1706         struct ibmvfc_host *vhost = shost_priv(job->shost);
1707         unsigned long port_id = (unsigned long)job->dd_data;
1708         struct ibmvfc_event *evt;
1709         struct ibmvfc_tmf *tmf;
1710         unsigned long flags;
1711         int rc;
1712
1713         ENTER;
1714         spin_lock_irqsave(vhost->host->host_lock, flags);
1715         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1716                 __ibmvfc_reset_host(vhost);
1717                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1718                 return 0;
1719         }
1720
1721         vhost->aborting_passthru = 1;
1722         evt = ibmvfc_get_event(vhost);
1723         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1724
1725         tmf = &evt->iu.tmf;
1726         memset(tmf, 0, sizeof(*tmf));
1727         tmf->common.version = cpu_to_be32(1);
1728         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
1729         tmf->common.length = cpu_to_be16(sizeof(*tmf));
1730         tmf->scsi_id = cpu_to_be64(port_id);
1731         tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1732         tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
1733         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1734
1735         if (rc != 0) {
1736                 vhost->aborting_passthru = 0;
1737                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1738                 rc = -EIO;
1739         } else
1740                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1741                          port_id);
1742
1743         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1744
1745         LEAVE;
1746         return rc;
1747 }
1748
1749 /**
1750  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1751  * @vhost:              struct ibmvfc_host to send command
1752  * @port_id:    port ID to send command
1753  *
1754  * Returns:
1755  *      0 on success / other on failure
1756  **/
1757 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1758 {
1759         struct ibmvfc_port_login *plogi;
1760         struct ibmvfc_target *tgt;
1761         struct ibmvfc_event *evt;
1762         union ibmvfc_iu rsp_iu;
1763         unsigned long flags;
1764         int rc = 0, issue_login = 1;
1765
1766         ENTER;
1767         spin_lock_irqsave(vhost->host->host_lock, flags);
1768         list_for_each_entry(tgt, &vhost->targets, queue) {
1769                 if (tgt->scsi_id == port_id) {
1770                         issue_login = 0;
1771                         break;
1772                 }
1773         }
1774
1775         if (!issue_login)
1776                 goto unlock_out;
1777         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1778                 goto unlock_out;
1779
1780         evt = ibmvfc_get_event(vhost);
1781         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1782         plogi = &evt->iu.plogi;
1783         memset(plogi, 0, sizeof(*plogi));
1784         plogi->common.version = cpu_to_be32(1);
1785         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
1786         plogi->common.length = cpu_to_be16(sizeof(*plogi));
1787         plogi->scsi_id = cpu_to_be64(port_id);
1788         evt->sync_iu = &rsp_iu;
1789         init_completion(&evt->comp);
1790
1791         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1792         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1793
1794         if (rc)
1795                 return -EIO;
1796
1797         wait_for_completion(&evt->comp);
1798
1799         if (rsp_iu.plogi.common.status)
1800                 rc = -EIO;
1801
1802         spin_lock_irqsave(vhost->host->host_lock, flags);
1803         ibmvfc_free_event(evt);
1804 unlock_out:
1805         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1806         LEAVE;
1807         return rc;
1808 }
1809
1810 /**
1811  * ibmvfc_bsg_request - Handle a BSG request
1812  * @job:        struct fc_bsg_job to be executed
1813  *
1814  * Returns:
1815  *      0 on success / other on failure
1816  **/
1817 static int ibmvfc_bsg_request(struct fc_bsg_job *job)
1818 {
1819         struct ibmvfc_host *vhost = shost_priv(job->shost);
1820         struct fc_rport *rport = job->rport;
1821         struct ibmvfc_passthru_mad *mad;
1822         struct ibmvfc_event *evt;
1823         union ibmvfc_iu rsp_iu;
1824         unsigned long flags, port_id = -1;
1825         unsigned int code = job->request->msgcode;
1826         int rc = 0, req_seg, rsp_seg, issue_login = 0;
1827         u32 fc_flags, rsp_len;
1828
1829         ENTER;
1830         job->reply->reply_payload_rcv_len = 0;
1831         if (rport)
1832                 port_id = rport->port_id;
1833
1834         switch (code) {
1835         case FC_BSG_HST_ELS_NOLOGIN:
1836                 port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
1837                         (job->request->rqst_data.h_els.port_id[1] << 8) |
1838                         job->request->rqst_data.h_els.port_id[2];
1839         case FC_BSG_RPT_ELS:
1840                 fc_flags = IBMVFC_FC_ELS;
1841                 break;
1842         case FC_BSG_HST_CT:
1843                 issue_login = 1;
1844                 port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
1845                         (job->request->rqst_data.h_ct.port_id[1] << 8) |
1846                         job->request->rqst_data.h_ct.port_id[2];
1847         case FC_BSG_RPT_CT:
1848                 fc_flags = IBMVFC_FC_CT_IU;
1849                 break;
1850         default:
1851                 return -ENOTSUPP;
1852         };
1853
1854         if (port_id == -1)
1855                 return -EINVAL;
1856         if (!mutex_trylock(&vhost->passthru_mutex))
1857                 return -EBUSY;
1858
1859         job->dd_data = (void *)port_id;
1860         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1861                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1862
1863         if (!req_seg) {
1864                 mutex_unlock(&vhost->passthru_mutex);
1865                 return -ENOMEM;
1866         }
1867
1868         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1869                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1870
1871         if (!rsp_seg) {
1872                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1873                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1874                 mutex_unlock(&vhost->passthru_mutex);
1875                 return -ENOMEM;
1876         }
1877
1878         if (req_seg > 1 || rsp_seg > 1) {
1879                 rc = -EINVAL;
1880                 goto out;
1881         }
1882
1883         if (issue_login)
1884                 rc = ibmvfc_bsg_plogi(vhost, port_id);
1885
1886         spin_lock_irqsave(vhost->host->host_lock, flags);
1887
1888         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1889             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1890                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1891                 goto out;
1892         }
1893
1894         evt = ibmvfc_get_event(vhost);
1895         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1896         mad = &evt->iu.passthru;
1897
1898         memset(mad, 0, sizeof(*mad));
1899         mad->common.version = cpu_to_be32(1);
1900         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
1901         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
1902
1903         mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
1904                 offsetof(struct ibmvfc_passthru_mad, iu));
1905         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
1906
1907         mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
1908         mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
1909         mad->iu.flags = cpu_to_be32(fc_flags);
1910         mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1911
1912         mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
1913         mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
1914         mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
1915         mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
1916         mad->iu.scsi_id = cpu_to_be64(port_id);
1917         mad->iu.tag = cpu_to_be64((u64)evt);
1918         rsp_len = be32_to_cpu(mad->iu.rsp.len);
1919
1920         evt->sync_iu = &rsp_iu;
1921         init_completion(&evt->comp);
1922         rc = ibmvfc_send_event(evt, vhost, 0);
1923         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1924
1925         if (rc) {
1926                 rc = -EIO;
1927                 goto out;
1928         }
1929
1930         wait_for_completion(&evt->comp);
1931
1932         if (rsp_iu.passthru.common.status)
1933                 rc = -EIO;
1934         else
1935                 job->reply->reply_payload_rcv_len = rsp_len;
1936
1937         spin_lock_irqsave(vhost->host->host_lock, flags);
1938         ibmvfc_free_event(evt);
1939         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1940         job->reply->result = rc;
1941         job->job_done(job);
1942         rc = 0;
1943 out:
1944         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1945                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
1946         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1947                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1948         mutex_unlock(&vhost->passthru_mutex);
1949         LEAVE;
1950         return rc;
1951 }
1952
1953 /**
1954  * ibmvfc_reset_device - Reset the device with the specified reset type
1955  * @sdev:       scsi device to reset
1956  * @type:       reset type
1957  * @desc:       reset type description for log messages
1958  *
1959  * Returns:
1960  *      0 on success / other on failure
1961  **/
1962 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1963 {
1964         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1965         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1966         struct ibmvfc_cmd *tmf;
1967         struct ibmvfc_event *evt = NULL;
1968         union ibmvfc_iu rsp_iu;
1969         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1970         int rsp_rc = -EBUSY;
1971         unsigned long flags;
1972         int rsp_code = 0;
1973
1974         spin_lock_irqsave(vhost->host->host_lock, flags);
1975         if (vhost->state == IBMVFC_ACTIVE) {
1976                 evt = ibmvfc_get_event(vhost);
1977                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1978
1979                 tmf = &evt->iu.cmd;
1980                 memset(tmf, 0, sizeof(*tmf));
1981                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1982                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
1983                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1984                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
1985                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
1986                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1987                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
1988                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1989                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
1990                 tmf->iu.tmf_flags = type;
1991                 evt->sync_iu = &rsp_iu;
1992
1993                 init_completion(&evt->comp);
1994                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1995         }
1996         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1997
1998         if (rsp_rc != 0) {
1999                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2000                             desc, rsp_rc);
2001                 return -EIO;
2002         }
2003
2004         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2005         wait_for_completion(&evt->comp);
2006
2007         if (rsp_iu.cmd.status)
2008                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2009
2010         if (rsp_code) {
2011                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2012                         rsp_code = fc_rsp->data.info.rsp_code;
2013
2014                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2015                             "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2016                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2017                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2018                             fc_rsp->scsi_status);
2019                 rsp_rc = -EIO;
2020         } else
2021                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2022
2023         spin_lock_irqsave(vhost->host->host_lock, flags);
2024         ibmvfc_free_event(evt);
2025         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2026         return rsp_rc;
2027 }
2028
2029 /**
2030  * ibmvfc_match_rport - Match function for specified remote port
2031  * @evt:        ibmvfc event struct
2032  * @device:     device to match (rport)
2033  *
2034  * Returns:
2035  *      1 if event matches rport / 0 if event does not match rport
2036  **/
2037 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2038 {
2039         struct fc_rport *cmd_rport;
2040
2041         if (evt->cmnd) {
2042                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2043                 if (cmd_rport == rport)
2044                         return 1;
2045         }
2046         return 0;
2047 }
2048
2049 /**
2050  * ibmvfc_match_target - Match function for specified target
2051  * @evt:        ibmvfc event struct
2052  * @device:     device to match (starget)
2053  *
2054  * Returns:
2055  *      1 if event matches starget / 0 if event does not match starget
2056  **/
2057 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2058 {
2059         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2060                 return 1;
2061         return 0;
2062 }
2063
2064 /**
2065  * ibmvfc_match_lun - Match function for specified LUN
2066  * @evt:        ibmvfc event struct
2067  * @device:     device to match (sdev)
2068  *
2069  * Returns:
2070  *      1 if event matches sdev / 0 if event does not match sdev
2071  **/
2072 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2073 {
2074         if (evt->cmnd && evt->cmnd->device == device)
2075                 return 1;
2076         return 0;
2077 }
2078
2079 /**
2080  * ibmvfc_wait_for_ops - Wait for ops to complete
2081  * @vhost:      ibmvfc host struct
2082  * @device:     device to match (starget or sdev)
2083  * @match:      match function
2084  *
2085  * Returns:
2086  *      SUCCESS / FAILED
2087  **/
2088 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2089                                int (*match) (struct ibmvfc_event *, void *))
2090 {
2091         struct ibmvfc_event *evt;
2092         DECLARE_COMPLETION_ONSTACK(comp);
2093         int wait;
2094         unsigned long flags;
2095         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2096
2097         ENTER;
2098         do {
2099                 wait = 0;
2100                 spin_lock_irqsave(vhost->host->host_lock, flags);
2101                 list_for_each_entry(evt, &vhost->sent, queue) {
2102                         if (match(evt, device)) {
2103                                 evt->eh_comp = &comp;
2104                                 wait++;
2105                         }
2106                 }
2107                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2108
2109                 if (wait) {
2110                         timeout = wait_for_completion_timeout(&comp, timeout);
2111
2112                         if (!timeout) {
2113                                 wait = 0;
2114                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2115                                 list_for_each_entry(evt, &vhost->sent, queue) {
2116                                         if (match(evt, device)) {
2117                                                 evt->eh_comp = NULL;
2118                                                 wait++;
2119                                         }
2120                                 }
2121                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2122                                 if (wait)
2123                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2124                                 LEAVE;
2125                                 return wait ? FAILED : SUCCESS;
2126                         }
2127                 }
2128         } while (wait);
2129
2130         LEAVE;
2131         return SUCCESS;
2132 }
2133
2134 /**
2135  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2136  * @sdev:       scsi device to cancel commands
2137  * @type:       type of error recovery being performed
2138  *
2139  * This sends a cancel to the VIOS for the specified device. This does
2140  * NOT send any abort to the actual device. That must be done separately.
2141  *
2142  * Returns:
2143  *      0 on success / other on failure
2144  **/
2145 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2146 {
2147         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2148         struct scsi_target *starget = scsi_target(sdev);
2149         struct fc_rport *rport = starget_to_rport(starget);
2150         struct ibmvfc_tmf *tmf;
2151         struct ibmvfc_event *evt, *found_evt;
2152         union ibmvfc_iu rsp;
2153         int rsp_rc = -EBUSY;
2154         unsigned long flags;
2155         u16 status;
2156
2157         ENTER;
2158         spin_lock_irqsave(vhost->host->host_lock, flags);
2159         found_evt = NULL;
2160         list_for_each_entry(evt, &vhost->sent, queue) {
2161                 if (evt->cmnd && evt->cmnd->device == sdev) {
2162                         found_evt = evt;
2163                         break;
2164                 }
2165         }
2166
2167         if (!found_evt) {
2168                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2169                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2170                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2171                 return 0;
2172         }
2173
2174         if (vhost->logged_in) {
2175                 evt = ibmvfc_get_event(vhost);
2176                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2177
2178                 tmf = &evt->iu.tmf;
2179                 memset(tmf, 0, sizeof(*tmf));
2180                 tmf->common.version = cpu_to_be32(1);
2181                 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2182                 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2183                 tmf->scsi_id = cpu_to_be64(rport->port_id);
2184                 int_to_scsilun(sdev->lun, &tmf->lun);
2185                 if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS))
2186                         type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2187                 if (vhost->state == IBMVFC_ACTIVE)
2188                         tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2189                 else
2190                         tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2191                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2192                 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2193
2194                 evt->sync_iu = &rsp;
2195                 init_completion(&evt->comp);
2196                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2197         }
2198
2199         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2200
2201         if (rsp_rc != 0) {
2202                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2203                 /* If failure is received, the host adapter is most likely going
2204                  through reset, return success so the caller will wait for the command
2205                  being cancelled to get returned */
2206                 return 0;
2207         }
2208
2209         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2210
2211         wait_for_completion(&evt->comp);
2212         status = be16_to_cpu(rsp.mad_common.status);
2213         spin_lock_irqsave(vhost->host->host_lock, flags);
2214         ibmvfc_free_event(evt);
2215         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2216
2217         if (status != IBMVFC_MAD_SUCCESS) {
2218                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2219                 switch (status) {
2220                 case IBMVFC_MAD_DRIVER_FAILED:
2221                 case IBMVFC_MAD_CRQ_ERROR:
2222                         /* Host adapter most likely going through reset, return success to
2223                          the caller will wait for the command being cancelled to get returned */
2224                         return 0;
2225                 default:
2226                         return -EIO;
2227                 };
2228         }
2229
2230         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2231         return 0;
2232 }
2233
2234 /**
2235  * ibmvfc_match_key - Match function for specified cancel key
2236  * @evt:        ibmvfc event struct
2237  * @key:        cancel key to match
2238  *
2239  * Returns:
2240  *      1 if event matches key / 0 if event does not match key
2241  **/
2242 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2243 {
2244         unsigned long cancel_key = (unsigned long)key;
2245
2246         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2247             be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2248                 return 1;
2249         return 0;
2250 }
2251
2252 /**
2253  * ibmvfc_match_evt - Match function for specified event
2254  * @evt:        ibmvfc event struct
2255  * @match:      event to match
2256  *
2257  * Returns:
2258  *      1 if event matches key / 0 if event does not match key
2259  **/
2260 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2261 {
2262         if (evt == match)
2263                 return 1;
2264         return 0;
2265 }
2266
2267 /**
2268  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2269  * @sdev:       scsi device to abort commands
2270  *
2271  * This sends an Abort Task Set to the VIOS for the specified device. This does
2272  * NOT send any cancel to the VIOS. That must be done separately.
2273  *
2274  * Returns:
2275  *      0 on success / other on failure
2276  **/
2277 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2278 {
2279         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2280         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2281         struct ibmvfc_cmd *tmf;
2282         struct ibmvfc_event *evt, *found_evt;
2283         union ibmvfc_iu rsp_iu;
2284         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2285         int rc, rsp_rc = -EBUSY;
2286         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2287         int rsp_code = 0;
2288
2289         spin_lock_irqsave(vhost->host->host_lock, flags);
2290         found_evt = NULL;
2291         list_for_each_entry(evt, &vhost->sent, queue) {
2292                 if (evt->cmnd && evt->cmnd->device == sdev) {
2293                         found_evt = evt;
2294                         break;
2295                 }
2296         }
2297
2298         if (!found_evt) {
2299                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2300                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2301                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2302                 return 0;
2303         }
2304
2305         if (vhost->state == IBMVFC_ACTIVE) {
2306                 evt = ibmvfc_get_event(vhost);
2307                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2308
2309                 tmf = &evt->iu.cmd;
2310                 memset(tmf, 0, sizeof(*tmf));
2311                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
2312                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
2313                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
2314                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
2315                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
2316                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2317                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
2318                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2319                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2320                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2321                 evt->sync_iu = &rsp_iu;
2322
2323                 init_completion(&evt->comp);
2324                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2325         }
2326
2327         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2328
2329         if (rsp_rc != 0) {
2330                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2331                 return -EIO;
2332         }
2333
2334         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2335         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2336
2337         if (!timeout) {
2338                 rc = ibmvfc_cancel_all(sdev, 0);
2339                 if (!rc) {
2340                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2341                         if (rc == SUCCESS)
2342                                 rc = 0;
2343                 }
2344
2345                 if (rc) {
2346                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2347                         ibmvfc_reset_host(vhost);
2348                         rsp_rc = -EIO;
2349                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2350
2351                         if (rc == SUCCESS)
2352                                 rsp_rc = 0;
2353
2354                         rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2355                         if (rc != SUCCESS) {
2356                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2357                                 ibmvfc_hard_reset_host(vhost);
2358                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2359                                 rsp_rc = 0;
2360                         }
2361
2362                         goto out;
2363                 }
2364         }
2365
2366         if (rsp_iu.cmd.status)
2367                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2368
2369         if (rsp_code) {
2370                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2371                         rsp_code = fc_rsp->data.info.rsp_code;
2372
2373                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2374                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2375                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2376                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2377                             fc_rsp->scsi_status);
2378                 rsp_rc = -EIO;
2379         } else
2380                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2381
2382 out:
2383         spin_lock_irqsave(vhost->host->host_lock, flags);
2384         ibmvfc_free_event(evt);
2385         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2386         return rsp_rc;
2387 }
2388
2389 /**
2390  * ibmvfc_eh_abort_handler - Abort a command
2391  * @cmd:        scsi command to abort
2392  *
2393  * Returns:
2394  *      SUCCESS / FAST_IO_FAIL / FAILED
2395  **/
2396 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2397 {
2398         struct scsi_device *sdev = cmd->device;
2399         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2400         int cancel_rc, block_rc;
2401         int rc = FAILED;
2402
2403         ENTER;
2404         block_rc = fc_block_scsi_eh(cmd);
2405         ibmvfc_wait_while_resetting(vhost);
2406         if (block_rc != FAST_IO_FAIL) {
2407                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2408                 ibmvfc_abort_task_set(sdev);
2409         } else
2410                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2411
2412         if (!cancel_rc)
2413                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2414
2415         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2416                 rc = FAST_IO_FAIL;
2417
2418         LEAVE;
2419         return rc;
2420 }
2421
2422 /**
2423  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2424  * @cmd:        scsi command struct
2425  *
2426  * Returns:
2427  *      SUCCESS / FAST_IO_FAIL / FAILED
2428  **/
2429 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2430 {
2431         struct scsi_device *sdev = cmd->device;
2432         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2433         int cancel_rc, block_rc, reset_rc = 0;
2434         int rc = FAILED;
2435
2436         ENTER;
2437         block_rc = fc_block_scsi_eh(cmd);
2438         ibmvfc_wait_while_resetting(vhost);
2439         if (block_rc != FAST_IO_FAIL) {
2440                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2441                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2442         } else
2443                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2444
2445         if (!cancel_rc && !reset_rc)
2446                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2447
2448         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2449                 rc = FAST_IO_FAIL;
2450
2451         LEAVE;
2452         return rc;
2453 }
2454
2455 /**
2456  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2457  * @sdev:       scsi device struct
2458  * @data:       return code
2459  *
2460  **/
2461 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2462 {
2463         unsigned long *rc = data;
2464         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2465 }
2466
2467 /**
2468  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2469  * @sdev:       scsi device struct
2470  * @data:       return code
2471  *
2472  **/
2473 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2474 {
2475         unsigned long *rc = data;
2476         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2477 }
2478
2479 /**
2480  * ibmvfc_eh_target_reset_handler - Reset the target
2481  * @cmd:        scsi command struct
2482  *
2483  * Returns:
2484  *      SUCCESS / FAST_IO_FAIL / FAILED
2485  **/
2486 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2487 {
2488         struct scsi_device *sdev = cmd->device;
2489         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2490         struct scsi_target *starget = scsi_target(sdev);
2491         int block_rc;
2492         int reset_rc = 0;
2493         int rc = FAILED;
2494         unsigned long cancel_rc = 0;
2495
2496         ENTER;
2497         block_rc = fc_block_scsi_eh(cmd);
2498         ibmvfc_wait_while_resetting(vhost);
2499         if (block_rc != FAST_IO_FAIL) {
2500                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2501                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2502         } else
2503                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2504
2505         if (!cancel_rc && !reset_rc)
2506                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2507
2508         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2509                 rc = FAST_IO_FAIL;
2510
2511         LEAVE;
2512         return rc;
2513 }
2514
2515 /**
2516  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2517  * @cmd:        struct scsi_cmnd having problems
2518  *
2519  **/
2520 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2521 {
2522         int rc, block_rc;
2523         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2524
2525         block_rc = fc_block_scsi_eh(cmd);
2526         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2527         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2528
2529         if (block_rc == FAST_IO_FAIL)
2530                 return FAST_IO_FAIL;
2531
2532         return rc ? FAILED : SUCCESS;
2533 }
2534
2535 /**
2536  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2537  * @rport:              rport struct
2538  *
2539  * Return value:
2540  *      none
2541  **/
2542 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2543 {
2544         struct Scsi_Host *shost = rport_to_shost(rport);
2545         struct ibmvfc_host *vhost = shost_priv(shost);
2546         struct fc_rport *dev_rport;
2547         struct scsi_device *sdev;
2548         unsigned long rc;
2549
2550         ENTER;
2551         shost_for_each_device(sdev, shost) {
2552                 dev_rport = starget_to_rport(scsi_target(sdev));
2553                 if (dev_rport != rport)
2554                         continue;
2555                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2556         }
2557
2558         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2559
2560         if (rc == FAILED)
2561                 ibmvfc_issue_fc_host_lip(shost);
2562         LEAVE;
2563 }
2564
2565 static const struct ibmvfc_async_desc ae_desc [] = {
2566         { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2567         { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2568         { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2569         { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2570         { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2571         { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
2572         { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
2573         { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
2574         { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
2575         { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
2576         { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
2577         { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
2578         { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2579 };
2580
2581 static const struct ibmvfc_async_desc unknown_ae = {
2582         "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2583 };
2584
2585 /**
2586  * ibmvfc_get_ae_desc - Get text description for async event
2587  * @ae: async event
2588  *
2589  **/
2590 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2591 {
2592         int i;
2593
2594         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2595                 if (ae_desc[i].ae == ae)
2596                         return &ae_desc[i];
2597
2598         return &unknown_ae;
2599 }
2600
2601 static const struct {
2602         enum ibmvfc_ae_link_state state;
2603         const char *desc;
2604 } link_desc [] = {
2605         { IBMVFC_AE_LS_LINK_UP,         " link up" },
2606         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
2607         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
2608         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
2609 };
2610
2611 /**
2612  * ibmvfc_get_link_state - Get text description for link state
2613  * @state:      link state
2614  *
2615  **/
2616 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2617 {
2618         int i;
2619
2620         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2621                 if (link_desc[i].state == state)
2622                         return link_desc[i].desc;
2623
2624         return "";
2625 }
2626
2627 /**
2628  * ibmvfc_handle_async - Handle an async event from the adapter
2629  * @crq:        crq to process
2630  * @vhost:      ibmvfc host struct
2631  *
2632  **/
2633 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2634                                 struct ibmvfc_host *vhost)
2635 {
2636         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
2637         struct ibmvfc_target *tgt;
2638
2639         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2640                    " node_name: %llx%s\n", desc->desc, crq->scsi_id, crq->wwpn, crq->node_name,
2641                    ibmvfc_get_link_state(crq->link_state));
2642
2643         switch (be64_to_cpu(crq->event)) {
2644         case IBMVFC_AE_RESUME:
2645                 switch (crq->link_state) {
2646                 case IBMVFC_AE_LS_LINK_DOWN:
2647                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2648                         break;
2649                 case IBMVFC_AE_LS_LINK_DEAD:
2650                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2651                         break;
2652                 case IBMVFC_AE_LS_LINK_UP:
2653                 case IBMVFC_AE_LS_LINK_BOUNCED:
2654                 default:
2655                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2656                         vhost->delay_init = 1;
2657                         __ibmvfc_reset_host(vhost);
2658                         break;
2659                 };
2660
2661                 break;
2662         case IBMVFC_AE_LINK_UP:
2663                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2664                 vhost->delay_init = 1;
2665                 __ibmvfc_reset_host(vhost);
2666                 break;
2667         case IBMVFC_AE_SCN_FABRIC:
2668         case IBMVFC_AE_SCN_DOMAIN:
2669                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2670                 if (vhost->state < IBMVFC_HALTED) {
2671                         vhost->delay_init = 1;
2672                         __ibmvfc_reset_host(vhost);
2673                 }
2674                 break;
2675         case IBMVFC_AE_SCN_NPORT:
2676         case IBMVFC_AE_SCN_GROUP:
2677                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2678                 ibmvfc_reinit_host(vhost);
2679                 break;
2680         case IBMVFC_AE_ELS_LOGO:
2681         case IBMVFC_AE_ELS_PRLO:
2682         case IBMVFC_AE_ELS_PLOGI:
2683                 list_for_each_entry(tgt, &vhost->targets, queue) {
2684                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2685                                 break;
2686                         if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
2687                                 continue;
2688                         if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
2689                                 continue;
2690                         if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
2691                                 continue;
2692                         if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
2693                                 tgt->logo_rcvd = 1;
2694                         if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
2695                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2696                                 ibmvfc_reinit_host(vhost);
2697                         }
2698                 }
2699                 break;
2700         case IBMVFC_AE_LINK_DOWN:
2701         case IBMVFC_AE_ADAPTER_FAILED:
2702                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2703                 break;
2704         case IBMVFC_AE_LINK_DEAD:
2705                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2706                 break;
2707         case IBMVFC_AE_HALT:
2708                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2709                 break;
2710         default:
2711                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2712                 break;
2713         };
2714 }
2715
2716 /**
2717  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2718  * @crq:        Command/Response queue
2719  * @vhost:      ibmvfc host struct
2720  *
2721  **/
2722 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2723 {
2724         long rc;
2725         struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
2726
2727         switch (crq->valid) {
2728         case IBMVFC_CRQ_INIT_RSP:
2729                 switch (crq->format) {
2730                 case IBMVFC_CRQ_INIT:
2731                         dev_info(vhost->dev, "Partner initialized\n");
2732                         /* Send back a response */
2733                         rc = ibmvfc_send_crq_init_complete(vhost);
2734                         if (rc == 0)
2735                                 ibmvfc_init_host(vhost);
2736                         else
2737                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2738                         break;
2739                 case IBMVFC_CRQ_INIT_COMPLETE:
2740                         dev_info(vhost->dev, "Partner initialization complete\n");
2741                         ibmvfc_init_host(vhost);
2742                         break;
2743                 default:
2744                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2745                 }
2746                 return;
2747         case IBMVFC_CRQ_XPORT_EVENT:
2748                 vhost->state = IBMVFC_NO_CRQ;
2749                 vhost->logged_in = 0;
2750                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2751                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2752                         /* We need to re-setup the interpartition connection */
2753                         dev_info(vhost->dev, "Re-enabling adapter\n");
2754                         vhost->client_migrated = 1;
2755                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2756                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2757                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2758                 } else {
2759                         dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2760                         ibmvfc_purge_requests(vhost, DID_ERROR);
2761                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2762                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2763                 }
2764                 return;
2765         case IBMVFC_CRQ_CMD_RSP:
2766                 break;
2767         default:
2768                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2769                 return;
2770         }
2771
2772         if (crq->format == IBMVFC_ASYNC_EVENT)
2773                 return;
2774
2775         /* The only kind of payload CRQs we should get are responses to
2776          * things we send. Make sure this response is to something we
2777          * actually sent
2778          */
2779         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2780                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2781                         crq->ioba);
2782                 return;
2783         }
2784
2785         if (unlikely(atomic_read(&evt->free))) {
2786                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2787                         crq->ioba);
2788                 return;
2789         }
2790
2791         del_timer(&evt->timer);
2792         list_del(&evt->queue);
2793         ibmvfc_trc_end(evt);
2794         evt->done(evt);
2795 }
2796
2797 /**
2798  * ibmvfc_scan_finished - Check if the device scan is done.
2799  * @shost:      scsi host struct
2800  * @time:       current elapsed time
2801  *
2802  * Returns:
2803  *      0 if scan is not done / 1 if scan is done
2804  **/
2805 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2806 {
2807         unsigned long flags;
2808         struct ibmvfc_host *vhost = shost_priv(shost);
2809         int done = 0;
2810
2811         spin_lock_irqsave(shost->host_lock, flags);
2812         if (time >= (init_timeout * HZ)) {
2813                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2814                          "continuing initialization\n", init_timeout);
2815                 done = 1;
2816         }
2817
2818         if (vhost->scan_complete)
2819                 done = 1;
2820         spin_unlock_irqrestore(shost->host_lock, flags);
2821         return done;
2822 }
2823
2824 /**
2825  * ibmvfc_slave_alloc - Setup the device's task set value
2826  * @sdev:       struct scsi_device device to configure
2827  *
2828  * Set the device's task set value so that error handling works as
2829  * expected.
2830  *
2831  * Returns:
2832  *      0 on success / -ENXIO if device does not exist
2833  **/
2834 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2835 {
2836         struct Scsi_Host *shost = sdev->host;
2837         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2838         struct ibmvfc_host *vhost = shost_priv(shost);
2839         unsigned long flags = 0;
2840
2841         if (!rport || fc_remote_port_chkready(rport))
2842                 return -ENXIO;
2843
2844         spin_lock_irqsave(shost->host_lock, flags);
2845         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2846         spin_unlock_irqrestore(shost->host_lock, flags);
2847         return 0;
2848 }
2849
2850 /**
2851  * ibmvfc_target_alloc - Setup the target's task set value
2852  * @starget:    struct scsi_target
2853  *
2854  * Set the target's task set value so that error handling works as
2855  * expected.
2856  *
2857  * Returns:
2858  *      0 on success / -ENXIO if device does not exist
2859  **/
2860 static int ibmvfc_target_alloc(struct scsi_target *starget)
2861 {
2862         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2863         struct ibmvfc_host *vhost = shost_priv(shost);
2864         unsigned long flags = 0;
2865
2866         spin_lock_irqsave(shost->host_lock, flags);
2867         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2868         spin_unlock_irqrestore(shost->host_lock, flags);
2869         return 0;
2870 }
2871
2872 /**
2873  * ibmvfc_slave_configure - Configure the device
2874  * @sdev:       struct scsi_device device to configure
2875  *
2876  * Enable allow_restart for a device if it is a disk. Adjust the
2877  * queue_depth here also.
2878  *
2879  * Returns:
2880  *      0
2881  **/
2882 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2883 {
2884         struct Scsi_Host *shost = sdev->host;
2885         unsigned long flags = 0;
2886
2887         spin_lock_irqsave(shost->host_lock, flags);
2888         if (sdev->type == TYPE_DISK)
2889                 sdev->allow_restart = 1;
2890         spin_unlock_irqrestore(shost->host_lock, flags);
2891         return 0;
2892 }
2893
2894 /**
2895  * ibmvfc_change_queue_depth - Change the device's queue depth
2896  * @sdev:       scsi device struct
2897  * @qdepth:     depth to set
2898  * @reason:     calling context
2899  *
2900  * Return value:
2901  *      actual depth set
2902  **/
2903 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth,
2904                                      int reason)
2905 {
2906         if (reason != SCSI_QDEPTH_DEFAULT)
2907                 return -EOPNOTSUPP;
2908
2909         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2910                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2911
2912         scsi_adjust_queue_depth(sdev, qdepth);
2913         return sdev->queue_depth;
2914 }
2915
2916 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2917                                                  struct device_attribute *attr, char *buf)
2918 {
2919         struct Scsi_Host *shost = class_to_shost(dev);
2920         struct ibmvfc_host *vhost = shost_priv(shost);
2921
2922         return snprintf(buf, PAGE_SIZE, "%s\n",
2923                         vhost->login_buf->resp.partition_name);
2924 }
2925
2926 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2927                                             struct device_attribute *attr, char *buf)
2928 {
2929         struct Scsi_Host *shost = class_to_shost(dev);
2930         struct ibmvfc_host *vhost = shost_priv(shost);
2931
2932         return snprintf(buf, PAGE_SIZE, "%s\n",
2933                         vhost->login_buf->resp.device_name);
2934 }
2935
2936 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2937                                          struct device_attribute *attr, char *buf)
2938 {
2939         struct Scsi_Host *shost = class_to_shost(dev);
2940         struct ibmvfc_host *vhost = shost_priv(shost);
2941
2942         return snprintf(buf, PAGE_SIZE, "%s\n",
2943                         vhost->login_buf->resp.port_loc_code);
2944 }
2945
2946 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2947                                          struct device_attribute *attr, char *buf)
2948 {
2949         struct Scsi_Host *shost = class_to_shost(dev);
2950         struct ibmvfc_host *vhost = shost_priv(shost);
2951
2952         return snprintf(buf, PAGE_SIZE, "%s\n",
2953                         vhost->login_buf->resp.drc_name);
2954 }
2955
2956 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2957                                              struct device_attribute *attr, char *buf)
2958 {
2959         struct Scsi_Host *shost = class_to_shost(dev);
2960         struct ibmvfc_host *vhost = shost_priv(shost);
2961         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2962 }
2963
2964 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2965                                              struct device_attribute *attr, char *buf)
2966 {
2967         struct Scsi_Host *shost = class_to_shost(dev);
2968         struct ibmvfc_host *vhost = shost_priv(shost);
2969         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2970 }
2971
2972 /**
2973  * ibmvfc_show_log_level - Show the adapter's error logging level
2974  * @dev:        class device struct
2975  * @buf:        buffer
2976  *
2977  * Return value:
2978  *      number of bytes printed to buffer
2979  **/
2980 static ssize_t ibmvfc_show_log_level(struct device *dev,
2981                                      struct device_attribute *attr, char *buf)
2982 {
2983         struct Scsi_Host *shost = class_to_shost(dev);
2984         struct ibmvfc_host *vhost = shost_priv(shost);
2985         unsigned long flags = 0;
2986         int len;
2987
2988         spin_lock_irqsave(shost->host_lock, flags);
2989         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2990         spin_unlock_irqrestore(shost->host_lock, flags);
2991         return len;
2992 }
2993
2994 /**
2995  * ibmvfc_store_log_level - Change the adapter's error logging level
2996  * @dev:        class device struct
2997  * @buf:        buffer
2998  *
2999  * Return value:
3000  *      number of bytes printed to buffer
3001  **/
3002 static ssize_t ibmvfc_store_log_level(struct device *dev,
3003                                       struct device_attribute *attr,
3004                                       const char *buf, size_t count)
3005 {
3006         struct Scsi_Host *shost = class_to_shost(dev);
3007         struct ibmvfc_host *vhost = shost_priv(shost);
3008         unsigned long flags = 0;
3009
3010         spin_lock_irqsave(shost->host_lock, flags);
3011         vhost->log_level = simple_strtoul(buf, NULL, 10);
3012         spin_unlock_irqrestore(shost->host_lock, flags);
3013         return strlen(buf);
3014 }
3015
3016 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3017 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3018 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3019 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3020 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3021 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3022 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3023                    ibmvfc_show_log_level, ibmvfc_store_log_level);
3024
3025 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3026 /**
3027  * ibmvfc_read_trace - Dump the adapter trace
3028  * @filp:               open sysfs file
3029  * @kobj:               kobject struct
3030  * @bin_attr:   bin_attribute struct
3031  * @buf:                buffer
3032  * @off:                offset
3033  * @count:              buffer size
3034  *
3035  * Return value:
3036  *      number of bytes printed to buffer
3037  **/
3038 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3039                                  struct bin_attribute *bin_attr,
3040                                  char *buf, loff_t off, size_t count)
3041 {
3042         struct device *dev = container_of(kobj, struct device, kobj);
3043         struct Scsi_Host *shost = class_to_shost(dev);
3044         struct ibmvfc_host *vhost = shost_priv(shost);
3045         unsigned long flags = 0;
3046         int size = IBMVFC_TRACE_SIZE;
3047         char *src = (char *)vhost->trace;
3048
3049         if (off > size)
3050                 return 0;
3051         if (off + count > size) {
3052                 size -= off;
3053                 count = size;
3054         }
3055
3056         spin_lock_irqsave(shost->host_lock, flags);
3057         memcpy(buf, &src[off], count);
3058         spin_unlock_irqrestore(shost->host_lock, flags);
3059         return count;
3060 }
3061
3062 static struct bin_attribute ibmvfc_trace_attr = {
3063         .attr = {
3064                 .name = "trace",
3065                 .mode = S_IRUGO,
3066         },
3067         .size = 0,
3068         .read = ibmvfc_read_trace,
3069 };
3070 #endif
3071
3072 static struct device_attribute *ibmvfc_attrs[] = {
3073         &dev_attr_partition_name,
3074         &dev_attr_device_name,
3075         &dev_attr_port_loc_code,
3076         &dev_attr_drc_name,
3077         &dev_attr_npiv_version,
3078         &dev_attr_capabilities,
3079         &dev_attr_log_level,
3080         NULL
3081 };
3082
3083 static struct scsi_host_template driver_template = {
3084         .module = THIS_MODULE,
3085         .name = "IBM POWER Virtual FC Adapter",
3086         .proc_name = IBMVFC_NAME,
3087         .queuecommand = ibmvfc_queuecommand,
3088         .eh_abort_handler = ibmvfc_eh_abort_handler,
3089         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3090         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3091         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3092         .slave_alloc = ibmvfc_slave_alloc,
3093         .slave_configure = ibmvfc_slave_configure,
3094         .target_alloc = ibmvfc_target_alloc,
3095         .scan_finished = ibmvfc_scan_finished,
3096         .change_queue_depth = ibmvfc_change_queue_depth,
3097         .change_queue_type = scsi_change_queue_type,
3098         .cmd_per_lun = 16,
3099         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3100         .this_id = -1,
3101         .sg_tablesize = SG_ALL,
3102         .max_sectors = IBMVFC_MAX_SECTORS,
3103         .use_clustering = ENABLE_CLUSTERING,
3104         .shost_attrs = ibmvfc_attrs,
3105         .use_blk_tags = 1,
3106         .track_queue_depth = 1,
3107 };
3108
3109 /**
3110  * ibmvfc_next_async_crq - Returns the next entry in async queue
3111  * @vhost:      ibmvfc host struct
3112  *
3113  * Returns:
3114  *      Pointer to next entry in queue / NULL if empty
3115  **/
3116 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3117 {
3118         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3119         struct ibmvfc_async_crq *crq;
3120
3121         crq = &async_crq->msgs[async_crq->cur];
3122         if (crq->valid & 0x80) {
3123                 if (++async_crq->cur == async_crq->size)
3124                         async_crq->cur = 0;
3125                 rmb();
3126         } else
3127                 crq = NULL;
3128
3129         return crq;
3130 }
3131
3132 /**
3133  * ibmvfc_next_crq - Returns the next entry in message queue
3134  * @vhost:      ibmvfc host struct
3135  *
3136  * Returns:
3137  *      Pointer to next entry in queue / NULL if empty
3138  **/
3139 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3140 {
3141         struct ibmvfc_crq_queue *queue = &vhost->crq;
3142         struct ibmvfc_crq *crq;
3143
3144         crq = &queue->msgs[queue->cur];
3145         if (crq->valid & 0x80) {
3146                 if (++queue->cur == queue->size)
3147                         queue->cur = 0;
3148                 rmb();
3149         } else
3150                 crq = NULL;
3151
3152         return crq;
3153 }
3154
3155 /**
3156  * ibmvfc_interrupt - Interrupt handler
3157  * @irq:                number of irq to handle, not used
3158  * @dev_instance: ibmvfc_host that received interrupt
3159  *
3160  * Returns:
3161  *      IRQ_HANDLED
3162  **/
3163 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3164 {
3165         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3166         unsigned long flags;
3167
3168         spin_lock_irqsave(vhost->host->host_lock, flags);
3169         vio_disable_interrupts(to_vio_dev(vhost->dev));
3170         tasklet_schedule(&vhost->tasklet);
3171         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3172         return IRQ_HANDLED;
3173 }
3174
3175 /**
3176  * ibmvfc_tasklet - Interrupt handler tasklet
3177  * @data:               ibmvfc host struct
3178  *
3179  * Returns:
3180  *      Nothing
3181  **/
3182 static void ibmvfc_tasklet(void *data)
3183 {
3184         struct ibmvfc_host *vhost = data;
3185         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3186         struct ibmvfc_crq *crq;
3187         struct ibmvfc_async_crq *async;
3188         unsigned long flags;
3189         int done = 0;
3190
3191         spin_lock_irqsave(vhost->host->host_lock, flags);
3192         while (!done) {
3193                 /* Pull all the valid messages off the async CRQ */
3194                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3195                         ibmvfc_handle_async(async, vhost);
3196                         async->valid = 0;
3197                         wmb();
3198                 }
3199
3200                 /* Pull all the valid messages off the CRQ */
3201                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3202                         ibmvfc_handle_crq(crq, vhost);
3203                         crq->valid = 0;
3204                         wmb();
3205                 }
3206
3207                 vio_enable_interrupts(vdev);
3208                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3209                         vio_disable_interrupts(vdev);
3210                         ibmvfc_handle_async(async, vhost);
3211                         async->valid = 0;
3212                         wmb();
3213                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3214                         vio_disable_interrupts(vdev);
3215                         ibmvfc_handle_crq(crq, vhost);
3216                         crq->valid = 0;
3217                         wmb();
3218                 } else
3219                         done = 1;
3220         }
3221
3222         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3223 }
3224
3225 /**
3226  * ibmvfc_init_tgt - Set the next init job step for the target
3227  * @tgt:                ibmvfc target struct
3228  * @job_step:   job step to perform
3229  *
3230  **/
3231 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3232                             void (*job_step) (struct ibmvfc_target *))
3233 {
3234         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3235         tgt->job_step = job_step;
3236         wake_up(&tgt->vhost->work_wait_q);
3237 }
3238
3239 /**
3240  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3241  * @tgt:                ibmvfc target struct
3242  * @job_step:   initialization job step
3243  *
3244  * Returns: 1 if step will be retried / 0 if not
3245  *
3246  **/
3247 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3248                                   void (*job_step) (struct ibmvfc_target *))
3249 {
3250         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3251                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3252                 wake_up(&tgt->vhost->work_wait_q);
3253                 return 0;
3254         } else
3255                 ibmvfc_init_tgt(tgt, job_step);
3256         return 1;
3257 }
3258
3259 /* Defined in FC-LS */
3260 static const struct {
3261         int code;
3262         int retry;
3263         int logged_in;
3264 } prli_rsp [] = {
3265         { 0, 1, 0 },
3266         { 1, 0, 1 },
3267         { 2, 1, 0 },
3268         { 3, 1, 0 },
3269         { 4, 0, 0 },
3270         { 5, 0, 0 },
3271         { 6, 0, 1 },
3272         { 7, 0, 0 },
3273         { 8, 1, 0 },
3274 };
3275
3276 /**
3277  * ibmvfc_get_prli_rsp - Find PRLI response index
3278  * @flags:      PRLI response flags
3279  *
3280  **/
3281 static int ibmvfc_get_prli_rsp(u16 flags)
3282 {
3283         int i;
3284         int code = (flags & 0x0f00) >> 8;
3285
3286         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3287                 if (prli_rsp[i].code == code)
3288                         return i;
3289
3290         return 0;
3291 }
3292
3293 /**
3294  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3295  * @evt:        ibmvfc event struct
3296  *
3297  **/
3298 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3299 {
3300         struct ibmvfc_target *tgt = evt->tgt;
3301         struct ibmvfc_host *vhost = evt->vhost;
3302         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3303         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3304         u32 status = be16_to_cpu(rsp->common.status);
3305         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3306
3307         vhost->discovery_threads--;
3308         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3309         switch (status) {
3310         case IBMVFC_MAD_SUCCESS:
3311                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3312                         parms->type, parms->flags, parms->service_parms);
3313
3314                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3315                         index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3316                         if (prli_rsp[index].logged_in) {
3317                                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3318                                         tgt->need_login = 0;
3319                                         tgt->ids.roles = 0;
3320                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3321                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3322                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3323                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3324                                         tgt->add_rport = 1;
3325                                 } else
3326                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3327                         } else if (prli_rsp[index].retry)
3328                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3329                         else
3330                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3331                 } else
3332                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3333                 break;
3334         case IBMVFC_MAD_DRIVER_FAILED:
3335                 break;
3336         case IBMVFC_MAD_CRQ_ERROR:
3337                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3338                 break;
3339         case IBMVFC_MAD_FAILED:
3340         default:
3341                 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3342                      be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3343                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3344                 else if (tgt->logo_rcvd)
3345                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3346                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3347                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3348                 else
3349                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3350
3351                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3352                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3353                         rsp->status, rsp->error, status);
3354                 break;
3355         };
3356
3357         kref_put(&tgt->kref, ibmvfc_release_tgt);
3358         ibmvfc_free_event(evt);
3359         wake_up(&vhost->work_wait_q);
3360 }
3361
3362 /**
3363  * ibmvfc_tgt_send_prli - Send a process login
3364  * @tgt:        ibmvfc target struct
3365  *
3366  **/
3367 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3368 {
3369         struct ibmvfc_process_login *prli;
3370         struct ibmvfc_host *vhost = tgt->vhost;
3371         struct ibmvfc_event *evt;
3372
3373         if (vhost->discovery_threads >= disc_threads)
3374                 return;
3375
3376         kref_get(&tgt->kref);
3377         evt = ibmvfc_get_event(vhost);
3378         vhost->discovery_threads++;
3379         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3380         evt->tgt = tgt;
3381         prli = &evt->iu.prli;
3382         memset(prli, 0, sizeof(*prli));
3383         prli->common.version = cpu_to_be32(1);
3384         prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
3385         prli->common.length = cpu_to_be16(sizeof(*prli));
3386         prli->scsi_id = cpu_to_be64(tgt->scsi_id);
3387
3388         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3389         prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
3390         prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
3391
3392         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3393         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3394                 vhost->discovery_threads--;
3395                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3396                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3397         } else
3398                 tgt_dbg(tgt, "Sent process login\n");
3399 }
3400
3401 /**
3402  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3403  * @evt:        ibmvfc event struct
3404  *
3405  **/
3406 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3407 {
3408         struct ibmvfc_target *tgt = evt->tgt;
3409         struct ibmvfc_host *vhost = evt->vhost;
3410         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3411         u32 status = be16_to_cpu(rsp->common.status);
3412         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3413
3414         vhost->discovery_threads--;
3415         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3416         switch (status) {
3417         case IBMVFC_MAD_SUCCESS:
3418                 tgt_dbg(tgt, "Port Login succeeded\n");
3419                 if (tgt->ids.port_name &&
3420                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3421                         vhost->reinit = 1;
3422                         tgt_dbg(tgt, "Port re-init required\n");
3423                         break;
3424                 }
3425                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3426                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3427                 tgt->ids.port_id = tgt->scsi_id;
3428                 memcpy(&tgt->service_parms, &rsp->service_parms,
3429                        sizeof(tgt->service_parms));
3430                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3431                        sizeof(tgt->service_parms_change));
3432                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3433                 break;
3434         case IBMVFC_MAD_DRIVER_FAILED:
3435                 break;
3436         case IBMVFC_MAD_CRQ_ERROR:
3437                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3438                 break;
3439         case IBMVFC_MAD_FAILED:
3440         default:
3441                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3442                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3443                 else
3444                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3445
3446                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3447                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), rsp->status, rsp->error,
3448                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), rsp->fc_type,
3449                         ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), rsp->fc_explain, status);
3450                 break;
3451         };
3452
3453         kref_put(&tgt->kref, ibmvfc_release_tgt);
3454         ibmvfc_free_event(evt);
3455         wake_up(&vhost->work_wait_q);
3456 }
3457
3458 /**
3459  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3460  * @tgt:        ibmvfc target struct
3461  *
3462  **/
3463 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3464 {
3465         struct ibmvfc_port_login *plogi;
3466         struct ibmvfc_host *vhost = tgt->vhost;
3467         struct ibmvfc_event *evt;
3468
3469         if (vhost->discovery_threads >= disc_threads)
3470                 return;
3471
3472         kref_get(&tgt->kref);
3473         tgt->logo_rcvd = 0;
3474         evt = ibmvfc_get_event(vhost);
3475         vhost->discovery_threads++;
3476         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3477         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3478         evt->tgt = tgt;
3479         plogi = &evt->iu.plogi;
3480         memset(plogi, 0, sizeof(*plogi));
3481         plogi->common.version = cpu_to_be32(1);
3482         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
3483         plogi->common.length = cpu_to_be16(sizeof(*plogi));
3484         plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
3485
3486         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3487                 vhost->discovery_threads--;
3488                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3489                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3490         } else
3491                 tgt_dbg(tgt, "Sent port login\n");
3492 }
3493
3494 /**
3495  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3496  * @evt:        ibmvfc event struct
3497  *
3498  **/
3499 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3500 {
3501         struct ibmvfc_target *tgt = evt->tgt;
3502         struct ibmvfc_host *vhost = evt->vhost;
3503         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3504         u32 status = be16_to_cpu(rsp->common.status);
3505
3506         vhost->discovery_threads--;
3507         ibmvfc_free_event(evt);
3508         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3509
3510         switch (status) {
3511         case IBMVFC_MAD_SUCCESS:
3512                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3513                 break;
3514         case IBMVFC_MAD_DRIVER_FAILED:
3515                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3516                 wake_up(&vhost->work_wait_q);
3517                 return;
3518         case IBMVFC_MAD_FAILED:
3519         default:
3520                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3521                 break;
3522         };
3523
3524         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3525                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3526         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3527                  tgt->scsi_id != tgt->new_scsi_id)
3528                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3529         kref_put(&tgt->kref, ibmvfc_release_tgt);
3530         wake_up(&vhost->work_wait_q);
3531 }
3532
3533 /**
3534  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3535  * @tgt:                ibmvfc target struct
3536  *
3537  **/
3538 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3539 {
3540         struct ibmvfc_implicit_logout *mad;
3541         struct ibmvfc_host *vhost = tgt->vhost;
3542         struct ibmvfc_event *evt;
3543
3544         if (vhost->discovery_threads >= disc_threads)
3545                 return;
3546
3547         kref_get(&tgt->kref);
3548         evt = ibmvfc_get_event(vhost);
3549         vhost->discovery_threads++;
3550         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3551         evt->tgt = tgt;
3552         mad = &evt->iu.implicit_logout;
3553         memset(mad, 0, sizeof(*mad));
3554         mad->common.version = cpu_to_be32(1);
3555         mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
3556         mad->common.length = cpu_to_be16(sizeof(*mad));
3557         mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
3558
3559         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3560         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3561                 vhost->discovery_threads--;
3562                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3563                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3564         } else
3565                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3566 }
3567
3568 /**
3569  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3570  * @mad:        ibmvfc passthru mad struct
3571  * @tgt:        ibmvfc target struct
3572  *
3573  * Returns:
3574  *      1 if PLOGI needed / 0 if PLOGI not needed
3575  **/
3576 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3577                                     struct ibmvfc_target *tgt)
3578 {
3579         if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3580                    sizeof(tgt->ids.port_name)))
3581                 return 1;
3582         if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3583                    sizeof(tgt->ids.node_name)))
3584                 return 1;
3585         if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
3586                 return 1;
3587         return 0;
3588 }
3589
3590 /**
3591  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3592  * @evt:        ibmvfc event struct
3593  *
3594  **/
3595 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3596 {
3597         struct ibmvfc_target *tgt = evt->tgt;
3598         struct ibmvfc_host *vhost = evt->vhost;
3599         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3600         u32 status = be16_to_cpu(mad->common.status);
3601         u8 fc_reason, fc_explain;
3602
3603         vhost->discovery_threads--;
3604         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3605         del_timer(&tgt->timer);
3606
3607         switch (status) {
3608         case IBMVFC_MAD_SUCCESS:
3609                 tgt_dbg(tgt, "ADISC succeeded\n");
3610                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3611                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3612                 break;
3613         case IBMVFC_MAD_DRIVER_FAILED:
3614                 break;
3615         case IBMVFC_MAD_FAILED:
3616         default:
3617                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3618                 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
3619                 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
3620                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3621                          ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
3622                          mad->iu.status, mad->iu.error,
3623                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3624                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3625                 break;
3626         };
3627
3628         kref_put(&tgt->kref, ibmvfc_release_tgt);
3629         ibmvfc_free_event(evt);
3630         wake_up(&vhost->work_wait_q);
3631 }
3632
3633 /**
3634  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3635  * @evt:                ibmvfc event struct
3636  *
3637  **/
3638 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3639 {
3640         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3641
3642         memset(mad, 0, sizeof(*mad));
3643         mad->common.version = cpu_to_be32(1);
3644         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
3645         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
3646         mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3647                 offsetof(struct ibmvfc_passthru_mad, iu));
3648         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
3649         mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3650         mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
3651         mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3652                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3653                 offsetof(struct ibmvfc_passthru_fc_iu, payload));
3654         mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3655         mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3656                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3657                 offsetof(struct ibmvfc_passthru_fc_iu, response));
3658         mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
3659 }
3660
3661 /**
3662  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3663  * @evt:                ibmvfc event struct
3664  *
3665  * Just cleanup this event struct. Everything else is handled by
3666  * the ADISC completion handler. If the ADISC never actually comes
3667  * back, we still have the timer running on the ADISC event struct
3668  * which will fire and cause the CRQ to get reset.
3669  *
3670  **/
3671 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3672 {
3673         struct ibmvfc_host *vhost = evt->vhost;
3674         struct ibmvfc_target *tgt = evt->tgt;
3675
3676         tgt_dbg(tgt, "ADISC cancel complete\n");
3677         vhost->abort_threads--;
3678         ibmvfc_free_event(evt);
3679         kref_put(&tgt->kref, ibmvfc_release_tgt);
3680         wake_up(&vhost->work_wait_q);
3681 }
3682
3683 /**
3684  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3685  * @tgt:                ibmvfc target struct
3686  *
3687  * If an ADISC times out, send a cancel. If the cancel times
3688  * out, reset the CRQ. When the ADISC comes back as cancelled,
3689  * log back into the target.
3690  **/
3691 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3692 {
3693         struct ibmvfc_host *vhost = tgt->vhost;
3694         struct ibmvfc_event *evt;
3695         struct ibmvfc_tmf *tmf;
3696         unsigned long flags;
3697         int rc;
3698
3699         tgt_dbg(tgt, "ADISC timeout\n");
3700         spin_lock_irqsave(vhost->host->host_lock, flags);
3701         if (vhost->abort_threads >= disc_threads ||
3702             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3703             vhost->state != IBMVFC_INITIALIZING ||
3704             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3705                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3706                 return;
3707         }
3708
3709         vhost->abort_threads++;
3710         kref_get(&tgt->kref);
3711         evt = ibmvfc_get_event(vhost);
3712         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3713
3714         evt->tgt = tgt;
3715         tmf = &evt->iu.tmf;
3716         memset(tmf, 0, sizeof(*tmf));
3717         tmf->common.version = cpu_to_be32(1);
3718         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
3719         tmf->common.length = cpu_to_be16(sizeof(*tmf));
3720         tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
3721         tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
3722
3723         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3724
3725         if (rc) {
3726                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3727                 vhost->abort_threads--;
3728                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3729                 __ibmvfc_reset_host(vhost);
3730         } else
3731                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3732         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3733 }
3734
3735 /**
3736  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3737  * @tgt:                ibmvfc target struct
3738  *
3739  * When sending an ADISC we end up with two timers running. The
3740  * first timer is the timer in the ibmvfc target struct. If this
3741  * fires, we send a cancel to the target. The second timer is the
3742  * timer on the ibmvfc event for the ADISC, which is longer. If that
3743  * fires, it means the ADISC timed out and our attempt to cancel it
3744  * also failed, so we need to reset the CRQ.
3745  **/
3746 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3747 {
3748         struct ibmvfc_passthru_mad *mad;
3749         struct ibmvfc_host *vhost = tgt->vhost;
3750         struct ibmvfc_event *evt;
3751
3752         if (vhost->discovery_threads >= disc_threads)
3753                 return;
3754
3755         kref_get(&tgt->kref);
3756         evt = ibmvfc_get_event(vhost);
3757         vhost->discovery_threads++;
3758         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3759         evt->tgt = tgt;
3760
3761         ibmvfc_init_passthru(evt);
3762         mad = &evt->iu.passthru;
3763         mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
3764         mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
3765         mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
3766
3767         mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
3768         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3769                sizeof(vhost->login_buf->resp.port_name));
3770         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3771                sizeof(vhost->login_buf->resp.node_name));
3772         mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
3773
3774         if (timer_pending(&tgt->timer))
3775                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3776         else {
3777                 tgt->timer.data = (unsigned long) tgt;
3778                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3779                 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3780                 add_timer(&tgt->timer);
3781         }
3782
3783         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3784         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3785                 vhost->discovery_threads--;
3786                 del_timer(&tgt->timer);
3787                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3788                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3789         } else
3790                 tgt_dbg(tgt, "Sent ADISC\n");
3791 }
3792
3793 /**
3794  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3795  * @evt:        ibmvfc event struct
3796  *
3797  **/
3798 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3799 {
3800         struct ibmvfc_target *tgt = evt->tgt;
3801         struct ibmvfc_host *vhost = evt->vhost;
3802         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3803         u32 status = be16_to_cpu(rsp->common.status);
3804         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3805
3806         vhost->discovery_threads--;
3807         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3808         switch (status) {
3809         case IBMVFC_MAD_SUCCESS:
3810                 tgt_dbg(tgt, "Query Target succeeded\n");
3811                 tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
3812                 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
3813                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3814                 else
3815                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3816                 break;
3817         case IBMVFC_MAD_DRIVER_FAILED:
3818                 break;
3819         case IBMVFC_MAD_CRQ_ERROR:
3820                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3821                 break;
3822         case IBMVFC_MAD_FAILED:
3823         default:
3824                 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3825                     be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3826                     be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
3827                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3828                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3829                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3830                 else
3831                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3832
3833                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3834                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3835                         rsp->status, rsp->error, ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)),
3836                         rsp->fc_type, ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)),
3837                         rsp->fc_explain, status);
3838                 break;
3839         };
3840
3841         kref_put(&tgt->kref, ibmvfc_release_tgt);
3842         ibmvfc_free_event(evt);
3843         wake_up(&vhost->work_wait_q);
3844 }
3845
3846 /**
3847  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3848  * @tgt:        ibmvfc target struct
3849  *
3850  **/
3851 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3852 {
3853         struct ibmvfc_query_tgt *query_tgt;
3854         struct ibmvfc_host *vhost = tgt->vhost;
3855         struct ibmvfc_event *evt;
3856
3857         if (vhost->discovery_threads >= disc_threads)
3858                 return;
3859
3860         kref_get(&tgt->kref);
3861         evt = ibmvfc_get_event(vhost);
3862         vhost->discovery_threads++;
3863         evt->tgt = tgt;
3864         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3865         query_tgt = &evt->iu.query_tgt;
3866         memset(query_tgt, 0, sizeof(*query_tgt));
3867         query_tgt->common.version = cpu_to_be32(1);
3868         query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
3869         query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
3870         query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
3871
3872         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3873         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3874                 vhost->discovery_threads--;
3875                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3876                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3877         } else
3878                 tgt_dbg(tgt, "Sent Query Target\n");
3879 }
3880
3881 /**
3882  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3883  * @vhost:              ibmvfc host struct
3884  * @scsi_id:    SCSI ID to allocate target for
3885  *
3886  * Returns:
3887  *      0 on success / other on failure
3888  **/
3889 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3890 {
3891         struct ibmvfc_target *tgt;
3892         unsigned long flags;
3893
3894         spin_lock_irqsave(vhost->host->host_lock, flags);
3895         list_for_each_entry(tgt, &vhost->targets, queue) {
3896                 if (tgt->scsi_id == scsi_id) {
3897                         if (tgt->need_login)
3898                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3899                         goto unlock_out;
3900                 }
3901         }
3902         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3903
3904         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3905         if (!tgt) {
3906                 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3907                         scsi_id);
3908                 return -ENOMEM;
3909         }
3910
3911         memset(tgt, 0, sizeof(*tgt));
3912         tgt->scsi_id = scsi_id;
3913         tgt->new_scsi_id = scsi_id;
3914         tgt->vhost = vhost;
3915         tgt->need_login = 1;
3916         tgt->cancel_key = vhost->task_set++;
3917         init_timer(&tgt->timer);
3918         kref_init(&tgt->kref);
3919         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3920         spin_lock_irqsave(vhost->host->host_lock, flags);
3921         list_add_tail(&tgt->queue, &vhost->targets);
3922
3923 unlock_out:
3924         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3925         return 0;
3926 }
3927
3928 /**
3929  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3930  * @vhost:              ibmvfc host struct
3931  *
3932  * Returns:
3933  *      0 on success / other on failure
3934  **/
3935 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3936 {
3937         int i, rc;
3938
3939         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3940                 rc = ibmvfc_alloc_target(vhost,
3941                                          be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
3942                                          IBMVFC_DISC_TGT_SCSI_ID_MASK);
3943
3944         return rc;
3945 }
3946
3947 /**
3948  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3949  * @evt:        ibmvfc event struct
3950  *
3951  **/
3952 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3953 {
3954         struct ibmvfc_host *vhost = evt->vhost;
3955         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3956         u32 mad_status = be16_to_cpu(rsp->common.status);
3957         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3958
3959         switch (mad_status) {
3960         case IBMVFC_MAD_SUCCESS:
3961                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3962                 vhost->num_targets = be32_to_cpu(rsp->num_written);
3963                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3964                 break;
3965         case IBMVFC_MAD_FAILED:
3966                 level += ibmvfc_retry_host_init(vhost);
3967                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3968                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3969                            rsp->status, rsp->error);
3970                 break;
3971         case IBMVFC_MAD_DRIVER_FAILED:
3972                 break;
3973         default:
3974                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3975                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3976                 break;
3977         }
3978
3979         ibmvfc_free_event(evt);
3980         wake_up(&vhost->work_wait_q);
3981 }
3982
3983 /**
3984  * ibmvfc_discover_targets - Send Discover Targets MAD
3985  * @vhost:      ibmvfc host struct
3986  *
3987  **/
3988 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3989 {
3990         struct ibmvfc_discover_targets *mad;
3991         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3992
3993         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3994         mad = &evt->iu.discover_targets;
3995         memset(mad, 0, sizeof(*mad));
3996         mad->common.version = cpu_to_be32(1);
3997         mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
3998         mad->common.length = cpu_to_be16(sizeof(*mad));
3999         mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
4000         mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
4001         mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
4002         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4003
4004         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4005                 ibmvfc_dbg(vhost, "Sent discover targets\n");
4006         else
4007                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4008 }
4009
4010 /**
4011  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
4012  * @evt:        ibmvfc event struct
4013  *
4014  **/
4015 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4016 {
4017         struct ibmvfc_host *vhost = evt->vhost;
4018         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
4019         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4020         unsigned int npiv_max_sectors;
4021         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4022
4023         switch (mad_status) {
4024         case IBMVFC_MAD_SUCCESS:
4025                 ibmvfc_free_event(evt);
4026                 break;
4027         case IBMVFC_MAD_FAILED:
4028                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4029                         level += ibmvfc_retry_host_init(vhost);
4030                 else
4031                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4032                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4033                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4034                                                 rsp->status, rsp->error);
4035                 ibmvfc_free_event(evt);
4036                 return;
4037         case IBMVFC_MAD_CRQ_ERROR:
4038                 ibmvfc_retry_host_init(vhost);
4039         case IBMVFC_MAD_DRIVER_FAILED:
4040                 ibmvfc_free_event(evt);
4041                 return;
4042         default:
4043                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4044                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4045                 ibmvfc_free_event(evt);
4046                 return;
4047         }
4048
4049         vhost->client_migrated = 0;
4050
4051         if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
4052                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4053                         rsp->flags);
4054                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4055                 wake_up(&vhost->work_wait_q);
4056                 return;
4057         }
4058
4059         if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
4060                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4061                         rsp->max_cmds);
4062                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4063                 wake_up(&vhost->work_wait_q);
4064                 return;
4065         }
4066
4067         vhost->logged_in = 1;
4068         npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
4069         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4070                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4071                  rsp->drc_name, npiv_max_sectors);
4072
4073         fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
4074         fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
4075         fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
4076         fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
4077         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4078         fc_host_supported_classes(vhost->host) = 0;
4079         if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
4080                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4081         if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
4082                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4083         if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
4084                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4085         fc_host_maxframe_size(vhost->host) =
4086                 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
4087
4088         vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
4089         vhost->host->max_sectors = npiv_max_sectors;
4090         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4091         wake_up(&vhost->work_wait_q);
4092 }
4093
4094 /**
4095  * ibmvfc_npiv_login - Sends NPIV login
4096  * @vhost:      ibmvfc host struct
4097  *
4098  **/
4099 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4100 {
4101         struct ibmvfc_npiv_login_mad *mad;
4102         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4103
4104         ibmvfc_gather_partition_info(vhost);
4105         ibmvfc_set_login_info(vhost);
4106         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4107
4108         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4109         mad = &evt->iu.npiv_login;
4110         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4111         mad->common.version = cpu_to_be32(1);
4112         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
4113         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
4114         mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
4115         mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
4116
4117         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4118
4119         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4120                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4121         else
4122                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4123 };
4124
4125 /**
4126  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4127  * @vhost:              ibmvfc host struct
4128  *
4129  **/
4130 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4131 {
4132         struct ibmvfc_host *vhost = evt->vhost;
4133         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
4134
4135         ibmvfc_free_event(evt);
4136
4137         switch (mad_status) {
4138         case IBMVFC_MAD_SUCCESS:
4139                 if (list_empty(&vhost->sent) &&
4140                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4141                         ibmvfc_init_host(vhost);
4142                         return;
4143                 }
4144                 break;
4145         case IBMVFC_MAD_FAILED:
4146         case IBMVFC_MAD_NOT_SUPPORTED:
4147         case IBMVFC_MAD_CRQ_ERROR:
4148         case IBMVFC_MAD_DRIVER_FAILED:
4149         default:
4150                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4151                 break;
4152         }
4153
4154         ibmvfc_hard_reset_host(vhost);
4155 }
4156
4157 /**
4158  * ibmvfc_npiv_logout - Issue an NPIV Logout
4159  * @vhost:              ibmvfc host struct
4160  *
4161  **/
4162 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4163 {
4164         struct ibmvfc_npiv_logout_mad *mad;
4165         struct ibmvfc_event *evt;
4166
4167         evt = ibmvfc_get_event(vhost);
4168         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4169
4170         mad = &evt->iu.npiv_logout;
4171         memset(mad, 0, sizeof(*mad));
4172         mad->common.version = cpu_to_be32(1);
4173         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
4174         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
4175
4176         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4177
4178         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4179                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4180         else
4181                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4182 }
4183
4184 /**
4185  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4186  * @vhost:              ibmvfc host struct
4187  *
4188  * Returns:
4189  *      1 if work to do / 0 if not
4190  **/
4191 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4192 {
4193         struct ibmvfc_target *tgt;
4194
4195         list_for_each_entry(tgt, &vhost->targets, queue) {
4196                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4197                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4198                         return 1;
4199         }
4200
4201         return 0;
4202 }
4203
4204 /**
4205  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4206  * @vhost:              ibmvfc host struct
4207  *
4208  * Returns:
4209  *      1 if work to do / 0 if not
4210  **/
4211 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4212 {
4213         struct ibmvfc_target *tgt;
4214
4215         if (kthread_should_stop())
4216                 return 1;
4217         switch (vhost->action) {
4218         case IBMVFC_HOST_ACTION_NONE:
4219         case IBMVFC_HOST_ACTION_INIT_WAIT:
4220         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4221                 return 0;
4222         case IBMVFC_HOST_ACTION_TGT_INIT:
4223         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4224                 if (vhost->discovery_threads == disc_threads)
4225                         return 0;
4226                 list_for_each_entry(tgt, &vhost->targets, queue)
4227                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4228                                 return 1;
4229                 list_for_each_entry(tgt, &vhost->targets, queue)
4230                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4231                                 return 0;
4232                 return 1;
4233         case IBMVFC_HOST_ACTION_LOGO:
4234         case IBMVFC_HOST_ACTION_INIT:
4235         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4236         case IBMVFC_HOST_ACTION_TGT_DEL:
4237         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4238         case IBMVFC_HOST_ACTION_QUERY:
4239         case IBMVFC_HOST_ACTION_RESET:
4240         case IBMVFC_HOST_ACTION_REENABLE:
4241         default:
4242                 break;
4243         };
4244
4245         return 1;
4246 }
4247
4248 /**
4249  * ibmvfc_work_to_do - Is there task level work to do?
4250  * @vhost:              ibmvfc host struct
4251  *
4252  * Returns:
4253  *      1 if work to do / 0 if not
4254  **/
4255 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4256 {
4257         unsigned long flags;
4258         int rc;
4259
4260         spin_lock_irqsave(vhost->host->host_lock, flags);
4261         rc = __ibmvfc_work_to_do(vhost);
4262         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4263         return rc;
4264 }
4265
4266 /**
4267  * ibmvfc_log_ae - Log async events if necessary
4268  * @vhost:              ibmvfc host struct
4269  * @events:             events to log
4270  *
4271  **/
4272 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4273 {
4274         if (events & IBMVFC_AE_RSCN)
4275                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4276         if ((events & IBMVFC_AE_LINKDOWN) &&
4277             vhost->state >= IBMVFC_HALTED)
4278                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4279         if ((events & IBMVFC_AE_LINKUP) &&
4280             vhost->state == IBMVFC_INITIALIZING)
4281                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4282 }
4283
4284 /**
4285  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4286  * @tgt:                ibmvfc target struct
4287  *
4288  **/
4289 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4290 {
4291         struct ibmvfc_host *vhost = tgt->vhost;
4292         struct fc_rport *rport;
4293         unsigned long flags;
4294
4295         tgt_dbg(tgt, "Adding rport\n");
4296         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4297         spin_lock_irqsave(vhost->host->host_lock, flags);
4298
4299         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4300                 tgt_dbg(tgt, "Deleting rport\n");
4301                 list_del(&tgt->queue);
4302                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4303                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4304                 fc_remote_port_delete(rport);
4305                 del_timer_sync(&tgt->timer);
4306                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4307                 return;
4308         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4309                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4310                 return;
4311         }
4312
4313         if (rport) {
4314                 tgt_dbg(tgt, "rport add succeeded\n");
4315                 tgt->rport = rport;
4316                 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
4317                 rport->supported_classes = 0;
4318                 tgt->target_id = rport->scsi_target_id;
4319                 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
4320                         rport->supported_classes |= FC_COS_CLASS1;
4321                 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
4322                         rport->supported_classes |= FC_COS_CLASS2;
4323                 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
4324                         rport->supported_classes |= FC_COS_CLASS3;
4325                 if (rport->rqst_q)
4326                         blk_queue_max_segments(rport->rqst_q, 1);
4327         } else
4328                 tgt_dbg(tgt, "rport add failed\n");
4329         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4330 }
4331
4332 /**
4333  * ibmvfc_do_work - Do task level work
4334  * @vhost:              ibmvfc host struct
4335  *
4336  **/
4337 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4338 {
4339         struct ibmvfc_target *tgt;
4340         unsigned long flags;
4341         struct fc_rport *rport;
4342         int rc;
4343
4344         ibmvfc_log_ae(vhost, vhost->events_to_log);
4345         spin_lock_irqsave(vhost->host->host_lock, flags);
4346         vhost->events_to_log = 0;
4347         switch (vhost->action) {
4348         case IBMVFC_HOST_ACTION_NONE:
4349         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4350         case IBMVFC_HOST_ACTION_INIT_WAIT:
4351                 break;
4352         case IBMVFC_HOST_ACTION_RESET:
4353                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4354                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4355                 rc = ibmvfc_reset_crq(vhost);
4356                 spin_lock_irqsave(vhost->host->host_lock, flags);
4357                 if (rc == H_CLOSED)
4358                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4359                 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4360                     (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4361                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4362                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4363                 }
4364                 break;
4365         case IBMVFC_HOST_ACTION_REENABLE:
4366                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4367                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4368                 rc = ibmvfc_reenable_crq_queue(vhost);
4369                 spin_lock_irqsave(vhost->host->host_lock, flags);
4370                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4371                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4372                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4373                 }
4374                 break;
4375         case IBMVFC_HOST_ACTION_LOGO:
4376                 vhost->job_step(vhost);
4377                 break;
4378         case IBMVFC_HOST_ACTION_INIT:
4379                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4380                 if (vhost->delay_init) {
4381                         vhost->delay_init = 0;
4382                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4383                         ssleep(15);
4384                         return;
4385                 } else
4386                         vhost->job_step(vhost);
4387                 break;
4388         case IBMVFC_HOST_ACTION_QUERY:
4389                 list_for_each_entry(tgt, &vhost->targets, queue)
4390                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4391                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4392                 break;
4393         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4394                 list_for_each_entry(tgt, &vhost->targets, queue) {
4395                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4396                                 tgt->job_step(tgt);
4397                                 break;
4398                         }
4399                 }
4400
4401                 if (!ibmvfc_dev_init_to_do(vhost))
4402                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4403                 break;
4404         case IBMVFC_HOST_ACTION_TGT_DEL:
4405         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4406                 list_for_each_entry(tgt, &vhost->targets, queue) {
4407                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4408                                 tgt_dbg(tgt, "Deleting rport\n");
4409                                 rport = tgt->rport;
4410                                 tgt->rport = NULL;
4411                                 list_del(&tgt->queue);
4412                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4413                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4414                                 if (rport)
4415                                         fc_remote_port_delete(rport);
4416                                 del_timer_sync(&tgt->timer);
4417                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4418                                 return;
4419                         }
4420                 }
4421
4422                 if (vhost->state == IBMVFC_INITIALIZING) {
4423                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4424                                 if (vhost->reinit) {
4425                                         vhost->reinit = 0;
4426                                         scsi_block_requests(vhost->host);
4427                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4428                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4429                                 } else {
4430                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4431                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4432                                         wake_up(&vhost->init_wait_q);
4433                                         schedule_work(&vhost->rport_add_work_q);
4434                                         vhost->init_retries = 0;
4435                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4436                                         scsi_unblock_requests(vhost->host);
4437                                 }
4438
4439                                 return;
4440                         } else {
4441                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4442                                 vhost->job_step = ibmvfc_discover_targets;
4443                         }
4444                 } else {
4445                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4446                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4447                         scsi_unblock_requests(vhost->host);
4448                         wake_up(&vhost->init_wait_q);
4449                         return;
4450                 }
4451                 break;
4452         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4453                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4454                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4455                 ibmvfc_alloc_targets(vhost);
4456                 spin_lock_irqsave(vhost->host->host_lock, flags);
4457                 break;
4458         case IBMVFC_HOST_ACTION_TGT_INIT:
4459                 list_for_each_entry(tgt, &vhost->targets, queue) {
4460                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4461                                 tgt->job_step(tgt);
4462                                 break;
4463                         }
4464                 }
4465
4466                 if (!ibmvfc_dev_init_to_do(vhost))
4467                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4468                 break;
4469         default:
4470                 break;
4471         };
4472
4473         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4474 }
4475
4476 /**
4477  * ibmvfc_work - Do task level work
4478  * @data:               ibmvfc host struct
4479  *
4480  * Returns:
4481  *      zero
4482  **/
4483 static int ibmvfc_work(void *data)
4484 {
4485         struct ibmvfc_host *vhost = data;
4486         int rc;
4487
4488         set_user_nice(current, MIN_NICE);
4489
4490         while (1) {
4491                 rc = wait_event_interruptible(vhost->work_wait_q,
4492                                               ibmvfc_work_to_do(vhost));
4493
4494                 BUG_ON(rc);
4495
4496                 if (kthread_should_stop())
4497                         break;
4498
4499                 ibmvfc_do_work(vhost);
4500         }
4501
4502         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4503         return 0;
4504 }
4505
4506 /**
4507  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4508  * @vhost:      ibmvfc host struct
4509  *
4510  * Allocates a page for messages, maps it for dma, and registers
4511  * the crq with the hypervisor.
4512  *
4513  * Return value:
4514  *      zero on success / other on failure
4515  **/
4516 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4517 {
4518         int rc, retrc = -ENOMEM;
4519         struct device *dev = vhost->dev;
4520         struct vio_dev *vdev = to_vio_dev(dev);
4521         struct ibmvfc_crq_queue *crq = &vhost->crq;
4522
4523         ENTER;
4524         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4525
4526         if (!crq->msgs)
4527                 return -ENOMEM;
4528
4529         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4530         crq->msg_token = dma_map_single(dev, crq->msgs,
4531                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4532
4533         if (dma_mapping_error(dev, crq->msg_token))
4534                 goto map_failed;
4535
4536         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4537                                         crq->msg_token, PAGE_SIZE);
4538
4539         if (rc == H_RESOURCE)
4540                 /* maybe kexecing and resource is busy. try a reset */
4541                 retrc = rc = ibmvfc_reset_crq(vhost);
4542
4543         if (rc == H_CLOSED)
4544                 dev_warn(dev, "Partner adapter not ready\n");
4545         else if (rc) {
4546                 dev_warn(dev, "Error %d opening adapter\n", rc);
4547                 goto reg_crq_failed;
4548         }
4549
4550         retrc = 0;
4551
4552         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4553
4554         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4555                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4556                 goto req_irq_failed;
4557         }
4558
4559         if ((rc = vio_enable_interrupts(vdev))) {
4560                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4561                 goto req_irq_failed;
4562         }
4563
4564         crq->cur = 0;
4565         LEAVE;
4566         return retrc;
4567
4568 req_irq_failed:
4569         tasklet_kill(&vhost->tasklet);
4570         do {
4571                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4572         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4573 reg_crq_failed:
4574         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4575 map_failed:
4576         free_page((unsigned long)crq->msgs);
4577         return retrc;
4578 }
4579
4580 /**
4581  * ibmvfc_free_mem - Free memory for vhost
4582  * @vhost:      ibmvfc host struct
4583  *
4584  * Return value:
4585  *      none
4586  **/
4587 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4588 {
4589         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4590
4591         ENTER;
4592         mempool_destroy(vhost->tgt_pool);
4593         kfree(vhost->trace);
4594         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4595                           vhost->disc_buf_dma);
4596         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4597                           vhost->login_buf, vhost->login_buf_dma);
4598         dma_pool_destroy(vhost->sg_pool);
4599         dma_unmap_single(vhost->dev, async_q->msg_token,
4600                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4601         free_page((unsigned long)async_q->msgs);
4602         LEAVE;
4603 }
4604
4605 /**
4606  * ibmvfc_alloc_mem - Allocate memory for vhost
4607  * @vhost:      ibmvfc host struct
4608  *
4609  * Return value:
4610  *      0 on success / non-zero on failure
4611  **/
4612 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4613 {
4614         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4615         struct device *dev = vhost->dev;
4616
4617         ENTER;
4618         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4619         if (!async_q->msgs) {
4620                 dev_err(dev, "Couldn't allocate async queue.\n");
4621                 goto nomem;
4622         }
4623
4624         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4625         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4626                                             async_q->size * sizeof(*async_q->msgs),
4627                                             DMA_BIDIRECTIONAL);
4628
4629         if (dma_mapping_error(dev, async_q->msg_token)) {
4630                 dev_err(dev, "Failed to map async queue\n");
4631                 goto free_async_crq;
4632         }
4633
4634         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4635                                          SG_ALL * sizeof(struct srp_direct_buf),
4636                                          sizeof(struct srp_direct_buf), 0);
4637
4638         if (!vhost->sg_pool) {
4639                 dev_err(dev, "Failed to allocate sg pool\n");
4640                 goto unmap_async_crq;
4641         }
4642
4643         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4644                                               &vhost->login_buf_dma, GFP_KERNEL);
4645
4646         if (!vhost->login_buf) {
4647                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4648                 goto free_sg_pool;
4649         }
4650
4651         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4652         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4653                                              &vhost->disc_buf_dma, GFP_KERNEL);
4654
4655         if (!vhost->disc_buf) {
4656                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4657                 goto free_login_buffer;
4658         }
4659
4660         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4661                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4662
4663         if (!vhost->trace)
4664                 goto free_disc_buffer;
4665
4666         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4667                                                       sizeof(struct ibmvfc_target));
4668
4669         if (!vhost->tgt_pool) {
4670                 dev_err(dev, "Couldn't allocate target memory pool\n");
4671                 goto free_trace;
4672         }
4673
4674         LEAVE;
4675         return 0;
4676
4677 free_trace:
4678         kfree(vhost->trace);
4679 free_disc_buffer:
4680         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4681                           vhost->disc_buf_dma);
4682 free_login_buffer:
4683         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4684                           vhost->login_buf, vhost->login_buf_dma);
4685 free_sg_pool:
4686         dma_pool_destroy(vhost->sg_pool);
4687 unmap_async_crq:
4688         dma_unmap_single(dev, async_q->msg_token,
4689                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4690 free_async_crq:
4691         free_page((unsigned long)async_q->msgs);
4692 nomem:
4693         LEAVE;
4694         return -ENOMEM;
4695 }
4696
4697 /**
4698  * ibmvfc_rport_add_thread - Worker thread for rport adds
4699  * @work:       work struct
4700  *
4701  **/
4702 static void ibmvfc_rport_add_thread(struct work_struct *work)
4703 {
4704         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4705                                                  rport_add_work_q);
4706         struct ibmvfc_target *tgt;
4707         struct fc_rport *rport;
4708         unsigned long flags;
4709         int did_work;
4710
4711         ENTER;
4712         spin_lock_irqsave(vhost->host->host_lock, flags);
4713         do {
4714                 did_work = 0;
4715                 if (vhost->state != IBMVFC_ACTIVE)
4716                         break;
4717
4718                 list_for_each_entry(tgt, &vhost->targets, queue) {
4719                         if (tgt->add_rport) {
4720                                 did_work = 1;
4721                                 tgt->add_rport = 0;
4722                                 kref_get(&tgt->kref);
4723                                 rport = tgt->rport;
4724                                 if (!rport) {
4725                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4726                                         ibmvfc_tgt_add_rport(tgt);
4727                                 } else if (get_device(&rport->dev)) {
4728                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4729                                         tgt_dbg(tgt, "Setting rport roles\n");
4730                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4731                                         put_device(&rport->dev);
4732                                 }
4733
4734                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4735                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4736                                 break;
4737                         }
4738                 }
4739         } while(did_work);
4740
4741         if (vhost->state == IBMVFC_ACTIVE)
4742                 vhost->scan_complete = 1;
4743         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4744         LEAVE;
4745 }
4746
4747 /**
4748  * ibmvfc_probe - Adapter hot plug add entry point
4749  * @vdev:       vio device struct
4750  * @id: vio device id struct
4751  *
4752  * Return value:
4753  *      0 on success / non-zero on failure
4754  **/
4755 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4756 {
4757         struct ibmvfc_host *vhost;
4758         struct Scsi_Host *shost;
4759         struct device *dev = &vdev->dev;
4760         int rc = -ENOMEM;
4761
4762         ENTER;
4763         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4764         if (!shost) {
4765                 dev_err(dev, "Couldn't allocate host data\n");
4766                 goto out;
4767         }
4768
4769         shost->transportt = ibmvfc_transport_template;
4770         shost->can_queue = max_requests;
4771         shost->max_lun = max_lun;
4772         shost->max_id = max_targets;
4773         shost->max_sectors = IBMVFC_MAX_SECTORS;
4774         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4775         shost->unique_id = shost->host_no;
4776
4777         vhost = shost_priv(shost);
4778         INIT_LIST_HEAD(&vhost->sent);
4779         INIT_LIST_HEAD(&vhost->free);
4780         INIT_LIST_HEAD(&vhost->targets);
4781         sprintf(vhost->name, IBMVFC_NAME);
4782         vhost->host = shost;
4783         vhost->dev = dev;
4784         vhost->partition_number = -1;
4785         vhost->log_level = log_level;
4786         vhost->task_set = 1;
4787         strcpy(vhost->partition_name, "UNKNOWN");
4788         init_waitqueue_head(&vhost->work_wait_q);
4789         init_waitqueue_head(&vhost->init_wait_q);
4790         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4791         mutex_init(&vhost->passthru_mutex);
4792
4793         if ((rc = ibmvfc_alloc_mem(vhost)))
4794                 goto free_scsi_host;
4795
4796         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4797                                          shost->host_no);
4798
4799         if (IS_ERR(vhost->work_thread)) {
4800                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4801                         PTR_ERR(vhost->work_thread));
4802                 goto free_host_mem;
4803         }
4804
4805         if ((rc = ibmvfc_init_crq(vhost))) {
4806                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4807                 goto kill_kthread;
4808         }
4809
4810         if ((rc = ibmvfc_init_event_pool(vhost))) {
4811                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4812                 goto release_crq;
4813         }
4814
4815         if ((rc = scsi_add_host(shost, dev)))
4816                 goto release_event_pool;
4817
4818         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4819
4820         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4821                                            &ibmvfc_trace_attr))) {
4822                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4823                 goto remove_shost;
4824         }
4825
4826         if (shost_to_fc_host(shost)->rqst_q)
4827                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4828         dev_set_drvdata(dev, vhost);
4829         spin_lock(&ibmvfc_driver_lock);
4830         list_add_tail(&vhost->queue, &ibmvfc_head);
4831         spin_unlock(&ibmvfc_driver_lock);
4832
4833         ibmvfc_send_crq_init(vhost);
4834         scsi_scan_host(shost);
4835         return 0;
4836
4837 remove_shost:
4838         scsi_remove_host(shost);
4839 release_event_pool:
4840         ibmvfc_free_event_pool(vhost);
4841 release_crq:
4842         ibmvfc_release_crq_queue(vhost);
4843 kill_kthread:
4844         kthread_stop(vhost->work_thread);
4845 free_host_mem:
4846         ibmvfc_free_mem(vhost);
4847 free_scsi_host:
4848         scsi_host_put(shost);
4849 out:
4850         LEAVE;
4851         return rc;
4852 }
4853
4854 /**
4855  * ibmvfc_remove - Adapter hot plug remove entry point
4856  * @vdev:       vio device struct
4857  *
4858  * Return value:
4859  *      0
4860  **/
4861 static int ibmvfc_remove(struct vio_dev *vdev)
4862 {
4863         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4864         unsigned long flags;
4865
4866         ENTER;
4867         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4868
4869         spin_lock_irqsave(vhost->host->host_lock, flags);
4870         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4871         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4872
4873         ibmvfc_wait_while_resetting(vhost);
4874         ibmvfc_release_crq_queue(vhost);
4875         kthread_stop(vhost->work_thread);
4876         fc_remove_host(vhost->host);
4877         scsi_remove_host(vhost->host);
4878
4879         spin_lock_irqsave(vhost->host->host_lock, flags);
4880         ibmvfc_purge_requests(vhost, DID_ERROR);
4881         ibmvfc_free_event_pool(vhost);
4882         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4883
4884         ibmvfc_free_mem(vhost);
4885         spin_lock(&ibmvfc_driver_lock);
4886         list_del(&vhost->queue);
4887         spin_unlock(&ibmvfc_driver_lock);
4888         scsi_host_put(vhost->host);
4889         LEAVE;
4890         return 0;
4891 }
4892
4893 /**
4894  * ibmvfc_resume - Resume from suspend
4895  * @dev:        device struct
4896  *
4897  * We may have lost an interrupt across suspend/resume, so kick the
4898  * interrupt handler
4899  *
4900  */
4901 static int ibmvfc_resume(struct device *dev)
4902 {
4903         unsigned long flags;
4904         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4905         struct vio_dev *vdev = to_vio_dev(dev);
4906
4907         spin_lock_irqsave(vhost->host->host_lock, flags);
4908         vio_disable_interrupts(vdev);
4909         tasklet_schedule(&vhost->tasklet);
4910         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4911         return 0;
4912 }
4913
4914 /**
4915  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4916  * @vdev:       vio device struct
4917  *
4918  * Return value:
4919  *      Number of bytes the driver will need to DMA map at the same time in
4920  *      order to perform well.
4921  */
4922 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4923 {
4924         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4925         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4926 }
4927
4928 static struct vio_device_id ibmvfc_device_table[] = {
4929         {"fcp", "IBM,vfc-client"},
4930         { "", "" }
4931 };
4932 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4933
4934 static struct dev_pm_ops ibmvfc_pm_ops = {
4935         .resume = ibmvfc_resume
4936 };
4937
4938 static struct vio_driver ibmvfc_driver = {
4939         .id_table = ibmvfc_device_table,
4940         .probe = ibmvfc_probe,
4941         .remove = ibmvfc_remove,
4942         .get_desired_dma = ibmvfc_get_desired_dma,
4943         .name = IBMVFC_NAME,
4944         .pm = &ibmvfc_pm_ops,
4945 };
4946
4947 static struct fc_function_template ibmvfc_transport_functions = {
4948         .show_host_fabric_name = 1,
4949         .show_host_node_name = 1,
4950         .show_host_port_name = 1,
4951         .show_host_supported_classes = 1,
4952         .show_host_port_type = 1,
4953         .show_host_port_id = 1,
4954         .show_host_maxframe_size = 1,
4955
4956         .get_host_port_state = ibmvfc_get_host_port_state,
4957         .show_host_port_state = 1,
4958
4959         .get_host_speed = ibmvfc_get_host_speed,
4960         .show_host_speed = 1,
4961
4962         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4963         .terminate_rport_io = ibmvfc_terminate_rport_io,
4964
4965         .show_rport_maxframe_size = 1,
4966         .show_rport_supported_classes = 1,
4967
4968         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4969         .show_rport_dev_loss_tmo = 1,
4970
4971         .get_starget_node_name = ibmvfc_get_starget_node_name,
4972         .show_starget_node_name = 1,
4973
4974         .get_starget_port_name = ibmvfc_get_starget_port_name,
4975         .show_starget_port_name = 1,
4976
4977         .get_starget_port_id = ibmvfc_get_starget_port_id,
4978         .show_starget_port_id = 1,
4979
4980         .bsg_request = ibmvfc_bsg_request,
4981         .bsg_timeout = ibmvfc_bsg_timeout,
4982 };
4983
4984 /**
4985  * ibmvfc_module_init - Initialize the ibmvfc module
4986  *
4987  * Return value:
4988  *      0 on success / other on failure
4989  **/
4990 static int __init ibmvfc_module_init(void)
4991 {
4992         int rc;
4993
4994         if (!firmware_has_feature(FW_FEATURE_VIO))
4995                 return -ENODEV;
4996
4997         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4998                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4999
5000         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
5001         if (!ibmvfc_transport_template)
5002                 return -ENOMEM;
5003
5004         rc = vio_register_driver(&ibmvfc_driver);
5005         if (rc)
5006                 fc_release_transport(ibmvfc_transport_template);
5007         return rc;
5008 }
5009
5010 /**
5011  * ibmvfc_module_exit - Teardown the ibmvfc module
5012  *
5013  * Return value:
5014  *      nothing
5015  **/
5016 static void __exit ibmvfc_module_exit(void)
5017 {
5018         vio_unregister_driver(&ibmvfc_driver);
5019         fc_release_transport(ibmvfc_transport_template);
5020 }
5021
5022 module_init(ibmvfc_module_init);
5023 module_exit(ibmvfc_module_exit);