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 {
2905         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2906                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2907
2908         return scsi_change_queue_depth(sdev, qdepth);
2909 }
2910
2911 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2912                                                  struct device_attribute *attr, char *buf)
2913 {
2914         struct Scsi_Host *shost = class_to_shost(dev);
2915         struct ibmvfc_host *vhost = shost_priv(shost);
2916
2917         return snprintf(buf, PAGE_SIZE, "%s\n",
2918                         vhost->login_buf->resp.partition_name);
2919 }
2920
2921 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2922                                             struct device_attribute *attr, char *buf)
2923 {
2924         struct Scsi_Host *shost = class_to_shost(dev);
2925         struct ibmvfc_host *vhost = shost_priv(shost);
2926
2927         return snprintf(buf, PAGE_SIZE, "%s\n",
2928                         vhost->login_buf->resp.device_name);
2929 }
2930
2931 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2932                                          struct device_attribute *attr, char *buf)
2933 {
2934         struct Scsi_Host *shost = class_to_shost(dev);
2935         struct ibmvfc_host *vhost = shost_priv(shost);
2936
2937         return snprintf(buf, PAGE_SIZE, "%s\n",
2938                         vhost->login_buf->resp.port_loc_code);
2939 }
2940
2941 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2942                                          struct device_attribute *attr, char *buf)
2943 {
2944         struct Scsi_Host *shost = class_to_shost(dev);
2945         struct ibmvfc_host *vhost = shost_priv(shost);
2946
2947         return snprintf(buf, PAGE_SIZE, "%s\n",
2948                         vhost->login_buf->resp.drc_name);
2949 }
2950
2951 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2952                                              struct device_attribute *attr, char *buf)
2953 {
2954         struct Scsi_Host *shost = class_to_shost(dev);
2955         struct ibmvfc_host *vhost = shost_priv(shost);
2956         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2957 }
2958
2959 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2960                                              struct device_attribute *attr, char *buf)
2961 {
2962         struct Scsi_Host *shost = class_to_shost(dev);
2963         struct ibmvfc_host *vhost = shost_priv(shost);
2964         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2965 }
2966
2967 /**
2968  * ibmvfc_show_log_level - Show the adapter's error logging level
2969  * @dev:        class device struct
2970  * @buf:        buffer
2971  *
2972  * Return value:
2973  *      number of bytes printed to buffer
2974  **/
2975 static ssize_t ibmvfc_show_log_level(struct device *dev,
2976                                      struct device_attribute *attr, char *buf)
2977 {
2978         struct Scsi_Host *shost = class_to_shost(dev);
2979         struct ibmvfc_host *vhost = shost_priv(shost);
2980         unsigned long flags = 0;
2981         int len;
2982
2983         spin_lock_irqsave(shost->host_lock, flags);
2984         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2985         spin_unlock_irqrestore(shost->host_lock, flags);
2986         return len;
2987 }
2988
2989 /**
2990  * ibmvfc_store_log_level - Change the adapter's error logging level
2991  * @dev:        class device struct
2992  * @buf:        buffer
2993  *
2994  * Return value:
2995  *      number of bytes printed to buffer
2996  **/
2997 static ssize_t ibmvfc_store_log_level(struct device *dev,
2998                                       struct device_attribute *attr,
2999                                       const char *buf, size_t count)
3000 {
3001         struct Scsi_Host *shost = class_to_shost(dev);
3002         struct ibmvfc_host *vhost = shost_priv(shost);
3003         unsigned long flags = 0;
3004
3005         spin_lock_irqsave(shost->host_lock, flags);
3006         vhost->log_level = simple_strtoul(buf, NULL, 10);
3007         spin_unlock_irqrestore(shost->host_lock, flags);
3008         return strlen(buf);
3009 }
3010
3011 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3012 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3013 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3014 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3015 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3016 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3017 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3018                    ibmvfc_show_log_level, ibmvfc_store_log_level);
3019
3020 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3021 /**
3022  * ibmvfc_read_trace - Dump the adapter trace
3023  * @filp:               open sysfs file
3024  * @kobj:               kobject struct
3025  * @bin_attr:   bin_attribute struct
3026  * @buf:                buffer
3027  * @off:                offset
3028  * @count:              buffer size
3029  *
3030  * Return value:
3031  *      number of bytes printed to buffer
3032  **/
3033 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3034                                  struct bin_attribute *bin_attr,
3035                                  char *buf, loff_t off, size_t count)
3036 {
3037         struct device *dev = container_of(kobj, struct device, kobj);
3038         struct Scsi_Host *shost = class_to_shost(dev);
3039         struct ibmvfc_host *vhost = shost_priv(shost);
3040         unsigned long flags = 0;
3041         int size = IBMVFC_TRACE_SIZE;
3042         char *src = (char *)vhost->trace;
3043
3044         if (off > size)
3045                 return 0;
3046         if (off + count > size) {
3047                 size -= off;
3048                 count = size;
3049         }
3050
3051         spin_lock_irqsave(shost->host_lock, flags);
3052         memcpy(buf, &src[off], count);
3053         spin_unlock_irqrestore(shost->host_lock, flags);
3054         return count;
3055 }
3056
3057 static struct bin_attribute ibmvfc_trace_attr = {
3058         .attr = {
3059                 .name = "trace",
3060                 .mode = S_IRUGO,
3061         },
3062         .size = 0,
3063         .read = ibmvfc_read_trace,
3064 };
3065 #endif
3066
3067 static struct device_attribute *ibmvfc_attrs[] = {
3068         &dev_attr_partition_name,
3069         &dev_attr_device_name,
3070         &dev_attr_port_loc_code,
3071         &dev_attr_drc_name,
3072         &dev_attr_npiv_version,
3073         &dev_attr_capabilities,
3074         &dev_attr_log_level,
3075         NULL
3076 };
3077
3078 static struct scsi_host_template driver_template = {
3079         .module = THIS_MODULE,
3080         .name = "IBM POWER Virtual FC Adapter",
3081         .proc_name = IBMVFC_NAME,
3082         .queuecommand = ibmvfc_queuecommand,
3083         .eh_abort_handler = ibmvfc_eh_abort_handler,
3084         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3085         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3086         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3087         .slave_alloc = ibmvfc_slave_alloc,
3088         .slave_configure = ibmvfc_slave_configure,
3089         .target_alloc = ibmvfc_target_alloc,
3090         .scan_finished = ibmvfc_scan_finished,
3091         .change_queue_depth = ibmvfc_change_queue_depth,
3092         .change_queue_type = scsi_change_queue_type,
3093         .cmd_per_lun = 16,
3094         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3095         .this_id = -1,
3096         .sg_tablesize = SG_ALL,
3097         .max_sectors = IBMVFC_MAX_SECTORS,
3098         .use_clustering = ENABLE_CLUSTERING,
3099         .shost_attrs = ibmvfc_attrs,
3100         .use_blk_tags = 1,
3101         .track_queue_depth = 1,
3102 };
3103
3104 /**
3105  * ibmvfc_next_async_crq - Returns the next entry in async queue
3106  * @vhost:      ibmvfc host struct
3107  *
3108  * Returns:
3109  *      Pointer to next entry in queue / NULL if empty
3110  **/
3111 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3112 {
3113         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3114         struct ibmvfc_async_crq *crq;
3115
3116         crq = &async_crq->msgs[async_crq->cur];
3117         if (crq->valid & 0x80) {
3118                 if (++async_crq->cur == async_crq->size)
3119                         async_crq->cur = 0;
3120                 rmb();
3121         } else
3122                 crq = NULL;
3123
3124         return crq;
3125 }
3126
3127 /**
3128  * ibmvfc_next_crq - Returns the next entry in message queue
3129  * @vhost:      ibmvfc host struct
3130  *
3131  * Returns:
3132  *      Pointer to next entry in queue / NULL if empty
3133  **/
3134 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3135 {
3136         struct ibmvfc_crq_queue *queue = &vhost->crq;
3137         struct ibmvfc_crq *crq;
3138
3139         crq = &queue->msgs[queue->cur];
3140         if (crq->valid & 0x80) {
3141                 if (++queue->cur == queue->size)
3142                         queue->cur = 0;
3143                 rmb();
3144         } else
3145                 crq = NULL;
3146
3147         return crq;
3148 }
3149
3150 /**
3151  * ibmvfc_interrupt - Interrupt handler
3152  * @irq:                number of irq to handle, not used
3153  * @dev_instance: ibmvfc_host that received interrupt
3154  *
3155  * Returns:
3156  *      IRQ_HANDLED
3157  **/
3158 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3159 {
3160         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3161         unsigned long flags;
3162
3163         spin_lock_irqsave(vhost->host->host_lock, flags);
3164         vio_disable_interrupts(to_vio_dev(vhost->dev));
3165         tasklet_schedule(&vhost->tasklet);
3166         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3167         return IRQ_HANDLED;
3168 }
3169
3170 /**
3171  * ibmvfc_tasklet - Interrupt handler tasklet
3172  * @data:               ibmvfc host struct
3173  *
3174  * Returns:
3175  *      Nothing
3176  **/
3177 static void ibmvfc_tasklet(void *data)
3178 {
3179         struct ibmvfc_host *vhost = data;
3180         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3181         struct ibmvfc_crq *crq;
3182         struct ibmvfc_async_crq *async;
3183         unsigned long flags;
3184         int done = 0;
3185
3186         spin_lock_irqsave(vhost->host->host_lock, flags);
3187         while (!done) {
3188                 /* Pull all the valid messages off the async CRQ */
3189                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3190                         ibmvfc_handle_async(async, vhost);
3191                         async->valid = 0;
3192                         wmb();
3193                 }
3194
3195                 /* Pull all the valid messages off the CRQ */
3196                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3197                         ibmvfc_handle_crq(crq, vhost);
3198                         crq->valid = 0;
3199                         wmb();
3200                 }
3201
3202                 vio_enable_interrupts(vdev);
3203                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3204                         vio_disable_interrupts(vdev);
3205                         ibmvfc_handle_async(async, vhost);
3206                         async->valid = 0;
3207                         wmb();
3208                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3209                         vio_disable_interrupts(vdev);
3210                         ibmvfc_handle_crq(crq, vhost);
3211                         crq->valid = 0;
3212                         wmb();
3213                 } else
3214                         done = 1;
3215         }
3216
3217         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3218 }
3219
3220 /**
3221  * ibmvfc_init_tgt - Set the next init job step for the target
3222  * @tgt:                ibmvfc target struct
3223  * @job_step:   job step to perform
3224  *
3225  **/
3226 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3227                             void (*job_step) (struct ibmvfc_target *))
3228 {
3229         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3230         tgt->job_step = job_step;
3231         wake_up(&tgt->vhost->work_wait_q);
3232 }
3233
3234 /**
3235  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3236  * @tgt:                ibmvfc target struct
3237  * @job_step:   initialization job step
3238  *
3239  * Returns: 1 if step will be retried / 0 if not
3240  *
3241  **/
3242 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3243                                   void (*job_step) (struct ibmvfc_target *))
3244 {
3245         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3246                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3247                 wake_up(&tgt->vhost->work_wait_q);
3248                 return 0;
3249         } else
3250                 ibmvfc_init_tgt(tgt, job_step);
3251         return 1;
3252 }
3253
3254 /* Defined in FC-LS */
3255 static const struct {
3256         int code;
3257         int retry;
3258         int logged_in;
3259 } prli_rsp [] = {
3260         { 0, 1, 0 },
3261         { 1, 0, 1 },
3262         { 2, 1, 0 },
3263         { 3, 1, 0 },
3264         { 4, 0, 0 },
3265         { 5, 0, 0 },
3266         { 6, 0, 1 },
3267         { 7, 0, 0 },
3268         { 8, 1, 0 },
3269 };
3270
3271 /**
3272  * ibmvfc_get_prli_rsp - Find PRLI response index
3273  * @flags:      PRLI response flags
3274  *
3275  **/
3276 static int ibmvfc_get_prli_rsp(u16 flags)
3277 {
3278         int i;
3279         int code = (flags & 0x0f00) >> 8;
3280
3281         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3282                 if (prli_rsp[i].code == code)
3283                         return i;
3284
3285         return 0;
3286 }
3287
3288 /**
3289  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3290  * @evt:        ibmvfc event struct
3291  *
3292  **/
3293 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3294 {
3295         struct ibmvfc_target *tgt = evt->tgt;
3296         struct ibmvfc_host *vhost = evt->vhost;
3297         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3298         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3299         u32 status = be16_to_cpu(rsp->common.status);
3300         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3301
3302         vhost->discovery_threads--;
3303         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3304         switch (status) {
3305         case IBMVFC_MAD_SUCCESS:
3306                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3307                         parms->type, parms->flags, parms->service_parms);
3308
3309                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3310                         index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3311                         if (prli_rsp[index].logged_in) {
3312                                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3313                                         tgt->need_login = 0;
3314                                         tgt->ids.roles = 0;
3315                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3316                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3317                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3318                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3319                                         tgt->add_rport = 1;
3320                                 } else
3321                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3322                         } else if (prli_rsp[index].retry)
3323                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3324                         else
3325                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3326                 } else
3327                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3328                 break;
3329         case IBMVFC_MAD_DRIVER_FAILED:
3330                 break;
3331         case IBMVFC_MAD_CRQ_ERROR:
3332                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3333                 break;
3334         case IBMVFC_MAD_FAILED:
3335         default:
3336                 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3337                      be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3338                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3339                 else if (tgt->logo_rcvd)
3340                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3341                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3342                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3343                 else
3344                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3345
3346                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3347                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3348                         rsp->status, rsp->error, status);
3349                 break;
3350         };
3351
3352         kref_put(&tgt->kref, ibmvfc_release_tgt);
3353         ibmvfc_free_event(evt);
3354         wake_up(&vhost->work_wait_q);
3355 }
3356
3357 /**
3358  * ibmvfc_tgt_send_prli - Send a process login
3359  * @tgt:        ibmvfc target struct
3360  *
3361  **/
3362 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3363 {
3364         struct ibmvfc_process_login *prli;
3365         struct ibmvfc_host *vhost = tgt->vhost;
3366         struct ibmvfc_event *evt;
3367
3368         if (vhost->discovery_threads >= disc_threads)
3369                 return;
3370
3371         kref_get(&tgt->kref);
3372         evt = ibmvfc_get_event(vhost);
3373         vhost->discovery_threads++;
3374         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3375         evt->tgt = tgt;
3376         prli = &evt->iu.prli;
3377         memset(prli, 0, sizeof(*prli));
3378         prli->common.version = cpu_to_be32(1);
3379         prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
3380         prli->common.length = cpu_to_be16(sizeof(*prli));
3381         prli->scsi_id = cpu_to_be64(tgt->scsi_id);
3382
3383         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3384         prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
3385         prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
3386
3387         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3388         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3389                 vhost->discovery_threads--;
3390                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3391                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3392         } else
3393                 tgt_dbg(tgt, "Sent process login\n");
3394 }
3395
3396 /**
3397  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3398  * @evt:        ibmvfc event struct
3399  *
3400  **/
3401 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3402 {
3403         struct ibmvfc_target *tgt = evt->tgt;
3404         struct ibmvfc_host *vhost = evt->vhost;
3405         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3406         u32 status = be16_to_cpu(rsp->common.status);
3407         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3408
3409         vhost->discovery_threads--;
3410         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3411         switch (status) {
3412         case IBMVFC_MAD_SUCCESS:
3413                 tgt_dbg(tgt, "Port Login succeeded\n");
3414                 if (tgt->ids.port_name &&
3415                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3416                         vhost->reinit = 1;
3417                         tgt_dbg(tgt, "Port re-init required\n");
3418                         break;
3419                 }
3420                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3421                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3422                 tgt->ids.port_id = tgt->scsi_id;
3423                 memcpy(&tgt->service_parms, &rsp->service_parms,
3424                        sizeof(tgt->service_parms));
3425                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3426                        sizeof(tgt->service_parms_change));
3427                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3428                 break;
3429         case IBMVFC_MAD_DRIVER_FAILED:
3430                 break;
3431         case IBMVFC_MAD_CRQ_ERROR:
3432                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3433                 break;
3434         case IBMVFC_MAD_FAILED:
3435         default:
3436                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3437                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3438                 else
3439                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3440
3441                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3442                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), rsp->status, rsp->error,
3443                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), rsp->fc_type,
3444                         ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), rsp->fc_explain, status);
3445                 break;
3446         };
3447
3448         kref_put(&tgt->kref, ibmvfc_release_tgt);
3449         ibmvfc_free_event(evt);
3450         wake_up(&vhost->work_wait_q);
3451 }
3452
3453 /**
3454  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3455  * @tgt:        ibmvfc target struct
3456  *
3457  **/
3458 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3459 {
3460         struct ibmvfc_port_login *plogi;
3461         struct ibmvfc_host *vhost = tgt->vhost;
3462         struct ibmvfc_event *evt;
3463
3464         if (vhost->discovery_threads >= disc_threads)
3465                 return;
3466
3467         kref_get(&tgt->kref);
3468         tgt->logo_rcvd = 0;
3469         evt = ibmvfc_get_event(vhost);
3470         vhost->discovery_threads++;
3471         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3472         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3473         evt->tgt = tgt;
3474         plogi = &evt->iu.plogi;
3475         memset(plogi, 0, sizeof(*plogi));
3476         plogi->common.version = cpu_to_be32(1);
3477         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
3478         plogi->common.length = cpu_to_be16(sizeof(*plogi));
3479         plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
3480
3481         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3482                 vhost->discovery_threads--;
3483                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3484                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3485         } else
3486                 tgt_dbg(tgt, "Sent port login\n");
3487 }
3488
3489 /**
3490  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3491  * @evt:        ibmvfc event struct
3492  *
3493  **/
3494 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3495 {
3496         struct ibmvfc_target *tgt = evt->tgt;
3497         struct ibmvfc_host *vhost = evt->vhost;
3498         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3499         u32 status = be16_to_cpu(rsp->common.status);
3500
3501         vhost->discovery_threads--;
3502         ibmvfc_free_event(evt);
3503         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3504
3505         switch (status) {
3506         case IBMVFC_MAD_SUCCESS:
3507                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3508                 break;
3509         case IBMVFC_MAD_DRIVER_FAILED:
3510                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3511                 wake_up(&vhost->work_wait_q);
3512                 return;
3513         case IBMVFC_MAD_FAILED:
3514         default:
3515                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3516                 break;
3517         };
3518
3519         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3520                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3521         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3522                  tgt->scsi_id != tgt->new_scsi_id)
3523                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3524         kref_put(&tgt->kref, ibmvfc_release_tgt);
3525         wake_up(&vhost->work_wait_q);
3526 }
3527
3528 /**
3529  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3530  * @tgt:                ibmvfc target struct
3531  *
3532  **/
3533 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3534 {
3535         struct ibmvfc_implicit_logout *mad;
3536         struct ibmvfc_host *vhost = tgt->vhost;
3537         struct ibmvfc_event *evt;
3538
3539         if (vhost->discovery_threads >= disc_threads)
3540                 return;
3541
3542         kref_get(&tgt->kref);
3543         evt = ibmvfc_get_event(vhost);
3544         vhost->discovery_threads++;
3545         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3546         evt->tgt = tgt;
3547         mad = &evt->iu.implicit_logout;
3548         memset(mad, 0, sizeof(*mad));
3549         mad->common.version = cpu_to_be32(1);
3550         mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
3551         mad->common.length = cpu_to_be16(sizeof(*mad));
3552         mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
3553
3554         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3555         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3556                 vhost->discovery_threads--;
3557                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3558                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3559         } else
3560                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3561 }
3562
3563 /**
3564  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3565  * @mad:        ibmvfc passthru mad struct
3566  * @tgt:        ibmvfc target struct
3567  *
3568  * Returns:
3569  *      1 if PLOGI needed / 0 if PLOGI not needed
3570  **/
3571 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3572                                     struct ibmvfc_target *tgt)
3573 {
3574         if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3575                    sizeof(tgt->ids.port_name)))
3576                 return 1;
3577         if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3578                    sizeof(tgt->ids.node_name)))
3579                 return 1;
3580         if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
3581                 return 1;
3582         return 0;
3583 }
3584
3585 /**
3586  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3587  * @evt:        ibmvfc event struct
3588  *
3589  **/
3590 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3591 {
3592         struct ibmvfc_target *tgt = evt->tgt;
3593         struct ibmvfc_host *vhost = evt->vhost;
3594         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3595         u32 status = be16_to_cpu(mad->common.status);
3596         u8 fc_reason, fc_explain;
3597
3598         vhost->discovery_threads--;
3599         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3600         del_timer(&tgt->timer);
3601
3602         switch (status) {
3603         case IBMVFC_MAD_SUCCESS:
3604                 tgt_dbg(tgt, "ADISC succeeded\n");
3605                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3606                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3607                 break;
3608         case IBMVFC_MAD_DRIVER_FAILED:
3609                 break;
3610         case IBMVFC_MAD_FAILED:
3611         default:
3612                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3613                 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
3614                 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
3615                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3616                          ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
3617                          mad->iu.status, mad->iu.error,
3618                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3619                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3620                 break;
3621         };
3622
3623         kref_put(&tgt->kref, ibmvfc_release_tgt);
3624         ibmvfc_free_event(evt);
3625         wake_up(&vhost->work_wait_q);
3626 }
3627
3628 /**
3629  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3630  * @evt:                ibmvfc event struct
3631  *
3632  **/
3633 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3634 {
3635         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3636
3637         memset(mad, 0, sizeof(*mad));
3638         mad->common.version = cpu_to_be32(1);
3639         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
3640         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
3641         mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3642                 offsetof(struct ibmvfc_passthru_mad, iu));
3643         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
3644         mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3645         mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
3646         mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3647                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3648                 offsetof(struct ibmvfc_passthru_fc_iu, payload));
3649         mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3650         mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3651                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3652                 offsetof(struct ibmvfc_passthru_fc_iu, response));
3653         mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
3654 }
3655
3656 /**
3657  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3658  * @evt:                ibmvfc event struct
3659  *
3660  * Just cleanup this event struct. Everything else is handled by
3661  * the ADISC completion handler. If the ADISC never actually comes
3662  * back, we still have the timer running on the ADISC event struct
3663  * which will fire and cause the CRQ to get reset.
3664  *
3665  **/
3666 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3667 {
3668         struct ibmvfc_host *vhost = evt->vhost;
3669         struct ibmvfc_target *tgt = evt->tgt;
3670
3671         tgt_dbg(tgt, "ADISC cancel complete\n");
3672         vhost->abort_threads--;
3673         ibmvfc_free_event(evt);
3674         kref_put(&tgt->kref, ibmvfc_release_tgt);
3675         wake_up(&vhost->work_wait_q);
3676 }
3677
3678 /**
3679  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3680  * @tgt:                ibmvfc target struct
3681  *
3682  * If an ADISC times out, send a cancel. If the cancel times
3683  * out, reset the CRQ. When the ADISC comes back as cancelled,
3684  * log back into the target.
3685  **/
3686 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3687 {
3688         struct ibmvfc_host *vhost = tgt->vhost;
3689         struct ibmvfc_event *evt;
3690         struct ibmvfc_tmf *tmf;
3691         unsigned long flags;
3692         int rc;
3693
3694         tgt_dbg(tgt, "ADISC timeout\n");
3695         spin_lock_irqsave(vhost->host->host_lock, flags);
3696         if (vhost->abort_threads >= disc_threads ||
3697             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3698             vhost->state != IBMVFC_INITIALIZING ||
3699             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3700                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3701                 return;
3702         }
3703
3704         vhost->abort_threads++;
3705         kref_get(&tgt->kref);
3706         evt = ibmvfc_get_event(vhost);
3707         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3708
3709         evt->tgt = tgt;
3710         tmf = &evt->iu.tmf;
3711         memset(tmf, 0, sizeof(*tmf));
3712         tmf->common.version = cpu_to_be32(1);
3713         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
3714         tmf->common.length = cpu_to_be16(sizeof(*tmf));
3715         tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
3716         tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
3717
3718         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3719
3720         if (rc) {
3721                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3722                 vhost->abort_threads--;
3723                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3724                 __ibmvfc_reset_host(vhost);
3725         } else
3726                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3727         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3728 }
3729
3730 /**
3731  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3732  * @tgt:                ibmvfc target struct
3733  *
3734  * When sending an ADISC we end up with two timers running. The
3735  * first timer is the timer in the ibmvfc target struct. If this
3736  * fires, we send a cancel to the target. The second timer is the
3737  * timer on the ibmvfc event for the ADISC, which is longer. If that
3738  * fires, it means the ADISC timed out and our attempt to cancel it
3739  * also failed, so we need to reset the CRQ.
3740  **/
3741 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3742 {
3743         struct ibmvfc_passthru_mad *mad;
3744         struct ibmvfc_host *vhost = tgt->vhost;
3745         struct ibmvfc_event *evt;
3746
3747         if (vhost->discovery_threads >= disc_threads)
3748                 return;
3749
3750         kref_get(&tgt->kref);
3751         evt = ibmvfc_get_event(vhost);
3752         vhost->discovery_threads++;
3753         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3754         evt->tgt = tgt;
3755
3756         ibmvfc_init_passthru(evt);
3757         mad = &evt->iu.passthru;
3758         mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
3759         mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
3760         mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
3761
3762         mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
3763         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3764                sizeof(vhost->login_buf->resp.port_name));
3765         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3766                sizeof(vhost->login_buf->resp.node_name));
3767         mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
3768
3769         if (timer_pending(&tgt->timer))
3770                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3771         else {
3772                 tgt->timer.data = (unsigned long) tgt;
3773                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3774                 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3775                 add_timer(&tgt->timer);
3776         }
3777
3778         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3779         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3780                 vhost->discovery_threads--;
3781                 del_timer(&tgt->timer);
3782                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3783                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3784         } else
3785                 tgt_dbg(tgt, "Sent ADISC\n");
3786 }
3787
3788 /**
3789  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3790  * @evt:        ibmvfc event struct
3791  *
3792  **/
3793 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3794 {
3795         struct ibmvfc_target *tgt = evt->tgt;
3796         struct ibmvfc_host *vhost = evt->vhost;
3797         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3798         u32 status = be16_to_cpu(rsp->common.status);
3799         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3800
3801         vhost->discovery_threads--;
3802         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3803         switch (status) {
3804         case IBMVFC_MAD_SUCCESS:
3805                 tgt_dbg(tgt, "Query Target succeeded\n");
3806                 tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
3807                 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
3808                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3809                 else
3810                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3811                 break;
3812         case IBMVFC_MAD_DRIVER_FAILED:
3813                 break;
3814         case IBMVFC_MAD_CRQ_ERROR:
3815                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3816                 break;
3817         case IBMVFC_MAD_FAILED:
3818         default:
3819                 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3820                     be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3821                     be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
3822                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3823                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3824                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3825                 else
3826                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3827
3828                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3829                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3830                         rsp->status, rsp->error, ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)),
3831                         rsp->fc_type, ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)),
3832                         rsp->fc_explain, status);
3833                 break;
3834         };
3835
3836         kref_put(&tgt->kref, ibmvfc_release_tgt);
3837         ibmvfc_free_event(evt);
3838         wake_up(&vhost->work_wait_q);
3839 }
3840
3841 /**
3842  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3843  * @tgt:        ibmvfc target struct
3844  *
3845  **/
3846 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3847 {
3848         struct ibmvfc_query_tgt *query_tgt;
3849         struct ibmvfc_host *vhost = tgt->vhost;
3850         struct ibmvfc_event *evt;
3851
3852         if (vhost->discovery_threads >= disc_threads)
3853                 return;
3854
3855         kref_get(&tgt->kref);
3856         evt = ibmvfc_get_event(vhost);
3857         vhost->discovery_threads++;
3858         evt->tgt = tgt;
3859         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3860         query_tgt = &evt->iu.query_tgt;
3861         memset(query_tgt, 0, sizeof(*query_tgt));
3862         query_tgt->common.version = cpu_to_be32(1);
3863         query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
3864         query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
3865         query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
3866
3867         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3868         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3869                 vhost->discovery_threads--;
3870                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3871                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3872         } else
3873                 tgt_dbg(tgt, "Sent Query Target\n");
3874 }
3875
3876 /**
3877  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3878  * @vhost:              ibmvfc host struct
3879  * @scsi_id:    SCSI ID to allocate target for
3880  *
3881  * Returns:
3882  *      0 on success / other on failure
3883  **/
3884 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3885 {
3886         struct ibmvfc_target *tgt;
3887         unsigned long flags;
3888
3889         spin_lock_irqsave(vhost->host->host_lock, flags);
3890         list_for_each_entry(tgt, &vhost->targets, queue) {
3891                 if (tgt->scsi_id == scsi_id) {
3892                         if (tgt->need_login)
3893                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3894                         goto unlock_out;
3895                 }
3896         }
3897         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3898
3899         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3900         if (!tgt) {
3901                 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3902                         scsi_id);
3903                 return -ENOMEM;
3904         }
3905
3906         memset(tgt, 0, sizeof(*tgt));
3907         tgt->scsi_id = scsi_id;
3908         tgt->new_scsi_id = scsi_id;
3909         tgt->vhost = vhost;
3910         tgt->need_login = 1;
3911         tgt->cancel_key = vhost->task_set++;
3912         init_timer(&tgt->timer);
3913         kref_init(&tgt->kref);
3914         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3915         spin_lock_irqsave(vhost->host->host_lock, flags);
3916         list_add_tail(&tgt->queue, &vhost->targets);
3917
3918 unlock_out:
3919         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3920         return 0;
3921 }
3922
3923 /**
3924  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3925  * @vhost:              ibmvfc host struct
3926  *
3927  * Returns:
3928  *      0 on success / other on failure
3929  **/
3930 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3931 {
3932         int i, rc;
3933
3934         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3935                 rc = ibmvfc_alloc_target(vhost,
3936                                          be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
3937                                          IBMVFC_DISC_TGT_SCSI_ID_MASK);
3938
3939         return rc;
3940 }
3941
3942 /**
3943  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3944  * @evt:        ibmvfc event struct
3945  *
3946  **/
3947 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3948 {
3949         struct ibmvfc_host *vhost = evt->vhost;
3950         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3951         u32 mad_status = be16_to_cpu(rsp->common.status);
3952         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3953
3954         switch (mad_status) {
3955         case IBMVFC_MAD_SUCCESS:
3956                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3957                 vhost->num_targets = be32_to_cpu(rsp->num_written);
3958                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3959                 break;
3960         case IBMVFC_MAD_FAILED:
3961                 level += ibmvfc_retry_host_init(vhost);
3962                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3963                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3964                            rsp->status, rsp->error);
3965                 break;
3966         case IBMVFC_MAD_DRIVER_FAILED:
3967                 break;
3968         default:
3969                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3970                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3971                 break;
3972         }
3973
3974         ibmvfc_free_event(evt);
3975         wake_up(&vhost->work_wait_q);
3976 }
3977
3978 /**
3979  * ibmvfc_discover_targets - Send Discover Targets MAD
3980  * @vhost:      ibmvfc host struct
3981  *
3982  **/
3983 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3984 {
3985         struct ibmvfc_discover_targets *mad;
3986         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3987
3988         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3989         mad = &evt->iu.discover_targets;
3990         memset(mad, 0, sizeof(*mad));
3991         mad->common.version = cpu_to_be32(1);
3992         mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
3993         mad->common.length = cpu_to_be16(sizeof(*mad));
3994         mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
3995         mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
3996         mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
3997         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3998
3999         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4000                 ibmvfc_dbg(vhost, "Sent discover targets\n");
4001         else
4002                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4003 }
4004
4005 /**
4006  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
4007  * @evt:        ibmvfc event struct
4008  *
4009  **/
4010 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4011 {
4012         struct ibmvfc_host *vhost = evt->vhost;
4013         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
4014         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4015         unsigned int npiv_max_sectors;
4016         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4017
4018         switch (mad_status) {
4019         case IBMVFC_MAD_SUCCESS:
4020                 ibmvfc_free_event(evt);
4021                 break;
4022         case IBMVFC_MAD_FAILED:
4023                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4024                         level += ibmvfc_retry_host_init(vhost);
4025                 else
4026                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4027                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4028                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4029                                                 rsp->status, rsp->error);
4030                 ibmvfc_free_event(evt);
4031                 return;
4032         case IBMVFC_MAD_CRQ_ERROR:
4033                 ibmvfc_retry_host_init(vhost);
4034         case IBMVFC_MAD_DRIVER_FAILED:
4035                 ibmvfc_free_event(evt);
4036                 return;
4037         default:
4038                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4039                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4040                 ibmvfc_free_event(evt);
4041                 return;
4042         }
4043
4044         vhost->client_migrated = 0;
4045
4046         if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
4047                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4048                         rsp->flags);
4049                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4050                 wake_up(&vhost->work_wait_q);
4051                 return;
4052         }
4053
4054         if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
4055                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4056                         rsp->max_cmds);
4057                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4058                 wake_up(&vhost->work_wait_q);
4059                 return;
4060         }
4061
4062         vhost->logged_in = 1;
4063         npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
4064         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4065                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4066                  rsp->drc_name, npiv_max_sectors);
4067
4068         fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
4069         fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
4070         fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
4071         fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
4072         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4073         fc_host_supported_classes(vhost->host) = 0;
4074         if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
4075                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4076         if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
4077                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4078         if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
4079                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4080         fc_host_maxframe_size(vhost->host) =
4081                 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
4082
4083         vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
4084         vhost->host->max_sectors = npiv_max_sectors;
4085         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4086         wake_up(&vhost->work_wait_q);
4087 }
4088
4089 /**
4090  * ibmvfc_npiv_login - Sends NPIV login
4091  * @vhost:      ibmvfc host struct
4092  *
4093  **/
4094 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4095 {
4096         struct ibmvfc_npiv_login_mad *mad;
4097         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4098
4099         ibmvfc_gather_partition_info(vhost);
4100         ibmvfc_set_login_info(vhost);
4101         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4102
4103         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4104         mad = &evt->iu.npiv_login;
4105         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4106         mad->common.version = cpu_to_be32(1);
4107         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
4108         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
4109         mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
4110         mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
4111
4112         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4113
4114         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4115                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4116         else
4117                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4118 };
4119
4120 /**
4121  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4122  * @vhost:              ibmvfc host struct
4123  *
4124  **/
4125 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4126 {
4127         struct ibmvfc_host *vhost = evt->vhost;
4128         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
4129
4130         ibmvfc_free_event(evt);
4131
4132         switch (mad_status) {
4133         case IBMVFC_MAD_SUCCESS:
4134                 if (list_empty(&vhost->sent) &&
4135                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4136                         ibmvfc_init_host(vhost);
4137                         return;
4138                 }
4139                 break;
4140         case IBMVFC_MAD_FAILED:
4141         case IBMVFC_MAD_NOT_SUPPORTED:
4142         case IBMVFC_MAD_CRQ_ERROR:
4143         case IBMVFC_MAD_DRIVER_FAILED:
4144         default:
4145                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4146                 break;
4147         }
4148
4149         ibmvfc_hard_reset_host(vhost);
4150 }
4151
4152 /**
4153  * ibmvfc_npiv_logout - Issue an NPIV Logout
4154  * @vhost:              ibmvfc host struct
4155  *
4156  **/
4157 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4158 {
4159         struct ibmvfc_npiv_logout_mad *mad;
4160         struct ibmvfc_event *evt;
4161
4162         evt = ibmvfc_get_event(vhost);
4163         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4164
4165         mad = &evt->iu.npiv_logout;
4166         memset(mad, 0, sizeof(*mad));
4167         mad->common.version = cpu_to_be32(1);
4168         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
4169         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
4170
4171         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4172
4173         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4174                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4175         else
4176                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4177 }
4178
4179 /**
4180  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4181  * @vhost:              ibmvfc host struct
4182  *
4183  * Returns:
4184  *      1 if work to do / 0 if not
4185  **/
4186 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4187 {
4188         struct ibmvfc_target *tgt;
4189
4190         list_for_each_entry(tgt, &vhost->targets, queue) {
4191                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4192                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4193                         return 1;
4194         }
4195
4196         return 0;
4197 }
4198
4199 /**
4200  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4201  * @vhost:              ibmvfc host struct
4202  *
4203  * Returns:
4204  *      1 if work to do / 0 if not
4205  **/
4206 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4207 {
4208         struct ibmvfc_target *tgt;
4209
4210         if (kthread_should_stop())
4211                 return 1;
4212         switch (vhost->action) {
4213         case IBMVFC_HOST_ACTION_NONE:
4214         case IBMVFC_HOST_ACTION_INIT_WAIT:
4215         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4216                 return 0;
4217         case IBMVFC_HOST_ACTION_TGT_INIT:
4218         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4219                 if (vhost->discovery_threads == disc_threads)
4220                         return 0;
4221                 list_for_each_entry(tgt, &vhost->targets, queue)
4222                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4223                                 return 1;
4224                 list_for_each_entry(tgt, &vhost->targets, queue)
4225                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4226                                 return 0;
4227                 return 1;
4228         case IBMVFC_HOST_ACTION_LOGO:
4229         case IBMVFC_HOST_ACTION_INIT:
4230         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4231         case IBMVFC_HOST_ACTION_TGT_DEL:
4232         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4233         case IBMVFC_HOST_ACTION_QUERY:
4234         case IBMVFC_HOST_ACTION_RESET:
4235         case IBMVFC_HOST_ACTION_REENABLE:
4236         default:
4237                 break;
4238         };
4239
4240         return 1;
4241 }
4242
4243 /**
4244  * ibmvfc_work_to_do - Is there task level work to do?
4245  * @vhost:              ibmvfc host struct
4246  *
4247  * Returns:
4248  *      1 if work to do / 0 if not
4249  **/
4250 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4251 {
4252         unsigned long flags;
4253         int rc;
4254
4255         spin_lock_irqsave(vhost->host->host_lock, flags);
4256         rc = __ibmvfc_work_to_do(vhost);
4257         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4258         return rc;
4259 }
4260
4261 /**
4262  * ibmvfc_log_ae - Log async events if necessary
4263  * @vhost:              ibmvfc host struct
4264  * @events:             events to log
4265  *
4266  **/
4267 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4268 {
4269         if (events & IBMVFC_AE_RSCN)
4270                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4271         if ((events & IBMVFC_AE_LINKDOWN) &&
4272             vhost->state >= IBMVFC_HALTED)
4273                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4274         if ((events & IBMVFC_AE_LINKUP) &&
4275             vhost->state == IBMVFC_INITIALIZING)
4276                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4277 }
4278
4279 /**
4280  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4281  * @tgt:                ibmvfc target struct
4282  *
4283  **/
4284 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4285 {
4286         struct ibmvfc_host *vhost = tgt->vhost;
4287         struct fc_rport *rport;
4288         unsigned long flags;
4289
4290         tgt_dbg(tgt, "Adding rport\n");
4291         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4292         spin_lock_irqsave(vhost->host->host_lock, flags);
4293
4294         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4295                 tgt_dbg(tgt, "Deleting rport\n");
4296                 list_del(&tgt->queue);
4297                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4298                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4299                 fc_remote_port_delete(rport);
4300                 del_timer_sync(&tgt->timer);
4301                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4302                 return;
4303         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4304                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4305                 return;
4306         }
4307
4308         if (rport) {
4309                 tgt_dbg(tgt, "rport add succeeded\n");
4310                 tgt->rport = rport;
4311                 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
4312                 rport->supported_classes = 0;
4313                 tgt->target_id = rport->scsi_target_id;
4314                 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
4315                         rport->supported_classes |= FC_COS_CLASS1;
4316                 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
4317                         rport->supported_classes |= FC_COS_CLASS2;
4318                 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
4319                         rport->supported_classes |= FC_COS_CLASS3;
4320                 if (rport->rqst_q)
4321                         blk_queue_max_segments(rport->rqst_q, 1);
4322         } else
4323                 tgt_dbg(tgt, "rport add failed\n");
4324         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4325 }
4326
4327 /**
4328  * ibmvfc_do_work - Do task level work
4329  * @vhost:              ibmvfc host struct
4330  *
4331  **/
4332 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4333 {
4334         struct ibmvfc_target *tgt;
4335         unsigned long flags;
4336         struct fc_rport *rport;
4337         int rc;
4338
4339         ibmvfc_log_ae(vhost, vhost->events_to_log);
4340         spin_lock_irqsave(vhost->host->host_lock, flags);
4341         vhost->events_to_log = 0;
4342         switch (vhost->action) {
4343         case IBMVFC_HOST_ACTION_NONE:
4344         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4345         case IBMVFC_HOST_ACTION_INIT_WAIT:
4346                 break;
4347         case IBMVFC_HOST_ACTION_RESET:
4348                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4349                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4350                 rc = ibmvfc_reset_crq(vhost);
4351                 spin_lock_irqsave(vhost->host->host_lock, flags);
4352                 if (rc == H_CLOSED)
4353                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4354                 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4355                     (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4356                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4357                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4358                 }
4359                 break;
4360         case IBMVFC_HOST_ACTION_REENABLE:
4361                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4362                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4363                 rc = ibmvfc_reenable_crq_queue(vhost);
4364                 spin_lock_irqsave(vhost->host->host_lock, flags);
4365                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4366                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4367                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4368                 }
4369                 break;
4370         case IBMVFC_HOST_ACTION_LOGO:
4371                 vhost->job_step(vhost);
4372                 break;
4373         case IBMVFC_HOST_ACTION_INIT:
4374                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4375                 if (vhost->delay_init) {
4376                         vhost->delay_init = 0;
4377                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4378                         ssleep(15);
4379                         return;
4380                 } else
4381                         vhost->job_step(vhost);
4382                 break;
4383         case IBMVFC_HOST_ACTION_QUERY:
4384                 list_for_each_entry(tgt, &vhost->targets, queue)
4385                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4386                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4387                 break;
4388         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4389                 list_for_each_entry(tgt, &vhost->targets, queue) {
4390                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4391                                 tgt->job_step(tgt);
4392                                 break;
4393                         }
4394                 }
4395
4396                 if (!ibmvfc_dev_init_to_do(vhost))
4397                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4398                 break;
4399         case IBMVFC_HOST_ACTION_TGT_DEL:
4400         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4401                 list_for_each_entry(tgt, &vhost->targets, queue) {
4402                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4403                                 tgt_dbg(tgt, "Deleting rport\n");
4404                                 rport = tgt->rport;
4405                                 tgt->rport = NULL;
4406                                 list_del(&tgt->queue);
4407                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4408                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4409                                 if (rport)
4410                                         fc_remote_port_delete(rport);
4411                                 del_timer_sync(&tgt->timer);
4412                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4413                                 return;
4414                         }
4415                 }
4416
4417                 if (vhost->state == IBMVFC_INITIALIZING) {
4418                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4419                                 if (vhost->reinit) {
4420                                         vhost->reinit = 0;
4421                                         scsi_block_requests(vhost->host);
4422                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4423                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4424                                 } else {
4425                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4426                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4427                                         wake_up(&vhost->init_wait_q);
4428                                         schedule_work(&vhost->rport_add_work_q);
4429                                         vhost->init_retries = 0;
4430                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4431                                         scsi_unblock_requests(vhost->host);
4432                                 }
4433
4434                                 return;
4435                         } else {
4436                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4437                                 vhost->job_step = ibmvfc_discover_targets;
4438                         }
4439                 } else {
4440                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4441                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4442                         scsi_unblock_requests(vhost->host);
4443                         wake_up(&vhost->init_wait_q);
4444                         return;
4445                 }
4446                 break;
4447         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4448                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4449                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4450                 ibmvfc_alloc_targets(vhost);
4451                 spin_lock_irqsave(vhost->host->host_lock, flags);
4452                 break;
4453         case IBMVFC_HOST_ACTION_TGT_INIT:
4454                 list_for_each_entry(tgt, &vhost->targets, queue) {
4455                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4456                                 tgt->job_step(tgt);
4457                                 break;
4458                         }
4459                 }
4460
4461                 if (!ibmvfc_dev_init_to_do(vhost))
4462                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4463                 break;
4464         default:
4465                 break;
4466         };
4467
4468         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4469 }
4470
4471 /**
4472  * ibmvfc_work - Do task level work
4473  * @data:               ibmvfc host struct
4474  *
4475  * Returns:
4476  *      zero
4477  **/
4478 static int ibmvfc_work(void *data)
4479 {
4480         struct ibmvfc_host *vhost = data;
4481         int rc;
4482
4483         set_user_nice(current, MIN_NICE);
4484
4485         while (1) {
4486                 rc = wait_event_interruptible(vhost->work_wait_q,
4487                                               ibmvfc_work_to_do(vhost));
4488
4489                 BUG_ON(rc);
4490
4491                 if (kthread_should_stop())
4492                         break;
4493
4494                 ibmvfc_do_work(vhost);
4495         }
4496
4497         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4498         return 0;
4499 }
4500
4501 /**
4502  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4503  * @vhost:      ibmvfc host struct
4504  *
4505  * Allocates a page for messages, maps it for dma, and registers
4506  * the crq with the hypervisor.
4507  *
4508  * Return value:
4509  *      zero on success / other on failure
4510  **/
4511 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4512 {
4513         int rc, retrc = -ENOMEM;
4514         struct device *dev = vhost->dev;
4515         struct vio_dev *vdev = to_vio_dev(dev);
4516         struct ibmvfc_crq_queue *crq = &vhost->crq;
4517
4518         ENTER;
4519         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4520
4521         if (!crq->msgs)
4522                 return -ENOMEM;
4523
4524         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4525         crq->msg_token = dma_map_single(dev, crq->msgs,
4526                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4527
4528         if (dma_mapping_error(dev, crq->msg_token))
4529                 goto map_failed;
4530
4531         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4532                                         crq->msg_token, PAGE_SIZE);
4533
4534         if (rc == H_RESOURCE)
4535                 /* maybe kexecing and resource is busy. try a reset */
4536                 retrc = rc = ibmvfc_reset_crq(vhost);
4537
4538         if (rc == H_CLOSED)
4539                 dev_warn(dev, "Partner adapter not ready\n");
4540         else if (rc) {
4541                 dev_warn(dev, "Error %d opening adapter\n", rc);
4542                 goto reg_crq_failed;
4543         }
4544
4545         retrc = 0;
4546
4547         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4548
4549         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4550                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4551                 goto req_irq_failed;
4552         }
4553
4554         if ((rc = vio_enable_interrupts(vdev))) {
4555                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4556                 goto req_irq_failed;
4557         }
4558
4559         crq->cur = 0;
4560         LEAVE;
4561         return retrc;
4562
4563 req_irq_failed:
4564         tasklet_kill(&vhost->tasklet);
4565         do {
4566                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4567         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4568 reg_crq_failed:
4569         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4570 map_failed:
4571         free_page((unsigned long)crq->msgs);
4572         return retrc;
4573 }
4574
4575 /**
4576  * ibmvfc_free_mem - Free memory for vhost
4577  * @vhost:      ibmvfc host struct
4578  *
4579  * Return value:
4580  *      none
4581  **/
4582 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4583 {
4584         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4585
4586         ENTER;
4587         mempool_destroy(vhost->tgt_pool);
4588         kfree(vhost->trace);
4589         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4590                           vhost->disc_buf_dma);
4591         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4592                           vhost->login_buf, vhost->login_buf_dma);
4593         dma_pool_destroy(vhost->sg_pool);
4594         dma_unmap_single(vhost->dev, async_q->msg_token,
4595                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4596         free_page((unsigned long)async_q->msgs);
4597         LEAVE;
4598 }
4599
4600 /**
4601  * ibmvfc_alloc_mem - Allocate memory for vhost
4602  * @vhost:      ibmvfc host struct
4603  *
4604  * Return value:
4605  *      0 on success / non-zero on failure
4606  **/
4607 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4608 {
4609         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4610         struct device *dev = vhost->dev;
4611
4612         ENTER;
4613         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4614         if (!async_q->msgs) {
4615                 dev_err(dev, "Couldn't allocate async queue.\n");
4616                 goto nomem;
4617         }
4618
4619         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4620         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4621                                             async_q->size * sizeof(*async_q->msgs),
4622                                             DMA_BIDIRECTIONAL);
4623
4624         if (dma_mapping_error(dev, async_q->msg_token)) {
4625                 dev_err(dev, "Failed to map async queue\n");
4626                 goto free_async_crq;
4627         }
4628
4629         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4630                                          SG_ALL * sizeof(struct srp_direct_buf),
4631                                          sizeof(struct srp_direct_buf), 0);
4632
4633         if (!vhost->sg_pool) {
4634                 dev_err(dev, "Failed to allocate sg pool\n");
4635                 goto unmap_async_crq;
4636         }
4637
4638         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4639                                               &vhost->login_buf_dma, GFP_KERNEL);
4640
4641         if (!vhost->login_buf) {
4642                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4643                 goto free_sg_pool;
4644         }
4645
4646         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4647         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4648                                              &vhost->disc_buf_dma, GFP_KERNEL);
4649
4650         if (!vhost->disc_buf) {
4651                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4652                 goto free_login_buffer;
4653         }
4654
4655         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4656                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4657
4658         if (!vhost->trace)
4659                 goto free_disc_buffer;
4660
4661         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4662                                                       sizeof(struct ibmvfc_target));
4663
4664         if (!vhost->tgt_pool) {
4665                 dev_err(dev, "Couldn't allocate target memory pool\n");
4666                 goto free_trace;
4667         }
4668
4669         LEAVE;
4670         return 0;
4671
4672 free_trace:
4673         kfree(vhost->trace);
4674 free_disc_buffer:
4675         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4676                           vhost->disc_buf_dma);
4677 free_login_buffer:
4678         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4679                           vhost->login_buf, vhost->login_buf_dma);
4680 free_sg_pool:
4681         dma_pool_destroy(vhost->sg_pool);
4682 unmap_async_crq:
4683         dma_unmap_single(dev, async_q->msg_token,
4684                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4685 free_async_crq:
4686         free_page((unsigned long)async_q->msgs);
4687 nomem:
4688         LEAVE;
4689         return -ENOMEM;
4690 }
4691
4692 /**
4693  * ibmvfc_rport_add_thread - Worker thread for rport adds
4694  * @work:       work struct
4695  *
4696  **/
4697 static void ibmvfc_rport_add_thread(struct work_struct *work)
4698 {
4699         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4700                                                  rport_add_work_q);
4701         struct ibmvfc_target *tgt;
4702         struct fc_rport *rport;
4703         unsigned long flags;
4704         int did_work;
4705
4706         ENTER;
4707         spin_lock_irqsave(vhost->host->host_lock, flags);
4708         do {
4709                 did_work = 0;
4710                 if (vhost->state != IBMVFC_ACTIVE)
4711                         break;
4712
4713                 list_for_each_entry(tgt, &vhost->targets, queue) {
4714                         if (tgt->add_rport) {
4715                                 did_work = 1;
4716                                 tgt->add_rport = 0;
4717                                 kref_get(&tgt->kref);
4718                                 rport = tgt->rport;
4719                                 if (!rport) {
4720                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4721                                         ibmvfc_tgt_add_rport(tgt);
4722                                 } else if (get_device(&rport->dev)) {
4723                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4724                                         tgt_dbg(tgt, "Setting rport roles\n");
4725                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4726                                         put_device(&rport->dev);
4727                                 }
4728
4729                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4730                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4731                                 break;
4732                         }
4733                 }
4734         } while(did_work);
4735
4736         if (vhost->state == IBMVFC_ACTIVE)
4737                 vhost->scan_complete = 1;
4738         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4739         LEAVE;
4740 }
4741
4742 /**
4743  * ibmvfc_probe - Adapter hot plug add entry point
4744  * @vdev:       vio device struct
4745  * @id: vio device id struct
4746  *
4747  * Return value:
4748  *      0 on success / non-zero on failure
4749  **/
4750 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4751 {
4752         struct ibmvfc_host *vhost;
4753         struct Scsi_Host *shost;
4754         struct device *dev = &vdev->dev;
4755         int rc = -ENOMEM;
4756
4757         ENTER;
4758         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4759         if (!shost) {
4760                 dev_err(dev, "Couldn't allocate host data\n");
4761                 goto out;
4762         }
4763
4764         shost->transportt = ibmvfc_transport_template;
4765         shost->can_queue = max_requests;
4766         shost->max_lun = max_lun;
4767         shost->max_id = max_targets;
4768         shost->max_sectors = IBMVFC_MAX_SECTORS;
4769         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4770         shost->unique_id = shost->host_no;
4771
4772         vhost = shost_priv(shost);
4773         INIT_LIST_HEAD(&vhost->sent);
4774         INIT_LIST_HEAD(&vhost->free);
4775         INIT_LIST_HEAD(&vhost->targets);
4776         sprintf(vhost->name, IBMVFC_NAME);
4777         vhost->host = shost;
4778         vhost->dev = dev;
4779         vhost->partition_number = -1;
4780         vhost->log_level = log_level;
4781         vhost->task_set = 1;
4782         strcpy(vhost->partition_name, "UNKNOWN");
4783         init_waitqueue_head(&vhost->work_wait_q);
4784         init_waitqueue_head(&vhost->init_wait_q);
4785         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4786         mutex_init(&vhost->passthru_mutex);
4787
4788         if ((rc = ibmvfc_alloc_mem(vhost)))
4789                 goto free_scsi_host;
4790
4791         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4792                                          shost->host_no);
4793
4794         if (IS_ERR(vhost->work_thread)) {
4795                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4796                         PTR_ERR(vhost->work_thread));
4797                 goto free_host_mem;
4798         }
4799
4800         if ((rc = ibmvfc_init_crq(vhost))) {
4801                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4802                 goto kill_kthread;
4803         }
4804
4805         if ((rc = ibmvfc_init_event_pool(vhost))) {
4806                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4807                 goto release_crq;
4808         }
4809
4810         if ((rc = scsi_add_host(shost, dev)))
4811                 goto release_event_pool;
4812
4813         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4814
4815         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4816                                            &ibmvfc_trace_attr))) {
4817                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4818                 goto remove_shost;
4819         }
4820
4821         if (shost_to_fc_host(shost)->rqst_q)
4822                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4823         dev_set_drvdata(dev, vhost);
4824         spin_lock(&ibmvfc_driver_lock);
4825         list_add_tail(&vhost->queue, &ibmvfc_head);
4826         spin_unlock(&ibmvfc_driver_lock);
4827
4828         ibmvfc_send_crq_init(vhost);
4829         scsi_scan_host(shost);
4830         return 0;
4831
4832 remove_shost:
4833         scsi_remove_host(shost);
4834 release_event_pool:
4835         ibmvfc_free_event_pool(vhost);
4836 release_crq:
4837         ibmvfc_release_crq_queue(vhost);
4838 kill_kthread:
4839         kthread_stop(vhost->work_thread);
4840 free_host_mem:
4841         ibmvfc_free_mem(vhost);
4842 free_scsi_host:
4843         scsi_host_put(shost);
4844 out:
4845         LEAVE;
4846         return rc;
4847 }
4848
4849 /**
4850  * ibmvfc_remove - Adapter hot plug remove entry point
4851  * @vdev:       vio device struct
4852  *
4853  * Return value:
4854  *      0
4855  **/
4856 static int ibmvfc_remove(struct vio_dev *vdev)
4857 {
4858         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4859         unsigned long flags;
4860
4861         ENTER;
4862         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4863
4864         spin_lock_irqsave(vhost->host->host_lock, flags);
4865         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4866         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4867
4868         ibmvfc_wait_while_resetting(vhost);
4869         ibmvfc_release_crq_queue(vhost);
4870         kthread_stop(vhost->work_thread);
4871         fc_remove_host(vhost->host);
4872         scsi_remove_host(vhost->host);
4873
4874         spin_lock_irqsave(vhost->host->host_lock, flags);
4875         ibmvfc_purge_requests(vhost, DID_ERROR);
4876         ibmvfc_free_event_pool(vhost);
4877         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4878
4879         ibmvfc_free_mem(vhost);
4880         spin_lock(&ibmvfc_driver_lock);
4881         list_del(&vhost->queue);
4882         spin_unlock(&ibmvfc_driver_lock);
4883         scsi_host_put(vhost->host);
4884         LEAVE;
4885         return 0;
4886 }
4887
4888 /**
4889  * ibmvfc_resume - Resume from suspend
4890  * @dev:        device struct
4891  *
4892  * We may have lost an interrupt across suspend/resume, so kick the
4893  * interrupt handler
4894  *
4895  */
4896 static int ibmvfc_resume(struct device *dev)
4897 {
4898         unsigned long flags;
4899         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4900         struct vio_dev *vdev = to_vio_dev(dev);
4901
4902         spin_lock_irqsave(vhost->host->host_lock, flags);
4903         vio_disable_interrupts(vdev);
4904         tasklet_schedule(&vhost->tasklet);
4905         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4906         return 0;
4907 }
4908
4909 /**
4910  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4911  * @vdev:       vio device struct
4912  *
4913  * Return value:
4914  *      Number of bytes the driver will need to DMA map at the same time in
4915  *      order to perform well.
4916  */
4917 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4918 {
4919         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4920         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4921 }
4922
4923 static struct vio_device_id ibmvfc_device_table[] = {
4924         {"fcp", "IBM,vfc-client"},
4925         { "", "" }
4926 };
4927 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4928
4929 static struct dev_pm_ops ibmvfc_pm_ops = {
4930         .resume = ibmvfc_resume
4931 };
4932
4933 static struct vio_driver ibmvfc_driver = {
4934         .id_table = ibmvfc_device_table,
4935         .probe = ibmvfc_probe,
4936         .remove = ibmvfc_remove,
4937         .get_desired_dma = ibmvfc_get_desired_dma,
4938         .name = IBMVFC_NAME,
4939         .pm = &ibmvfc_pm_ops,
4940 };
4941
4942 static struct fc_function_template ibmvfc_transport_functions = {
4943         .show_host_fabric_name = 1,
4944         .show_host_node_name = 1,
4945         .show_host_port_name = 1,
4946         .show_host_supported_classes = 1,
4947         .show_host_port_type = 1,
4948         .show_host_port_id = 1,
4949         .show_host_maxframe_size = 1,
4950
4951         .get_host_port_state = ibmvfc_get_host_port_state,
4952         .show_host_port_state = 1,
4953
4954         .get_host_speed = ibmvfc_get_host_speed,
4955         .show_host_speed = 1,
4956
4957         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4958         .terminate_rport_io = ibmvfc_terminate_rport_io,
4959
4960         .show_rport_maxframe_size = 1,
4961         .show_rport_supported_classes = 1,
4962
4963         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4964         .show_rport_dev_loss_tmo = 1,
4965
4966         .get_starget_node_name = ibmvfc_get_starget_node_name,
4967         .show_starget_node_name = 1,
4968
4969         .get_starget_port_name = ibmvfc_get_starget_port_name,
4970         .show_starget_port_name = 1,
4971
4972         .get_starget_port_id = ibmvfc_get_starget_port_id,
4973         .show_starget_port_id = 1,
4974
4975         .bsg_request = ibmvfc_bsg_request,
4976         .bsg_timeout = ibmvfc_bsg_timeout,
4977 };
4978
4979 /**
4980  * ibmvfc_module_init - Initialize the ibmvfc module
4981  *
4982  * Return value:
4983  *      0 on success / other on failure
4984  **/
4985 static int __init ibmvfc_module_init(void)
4986 {
4987         int rc;
4988
4989         if (!firmware_has_feature(FW_FEATURE_VIO))
4990                 return -ENODEV;
4991
4992         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4993                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4994
4995         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4996         if (!ibmvfc_transport_template)
4997                 return -ENOMEM;
4998
4999         rc = vio_register_driver(&ibmvfc_driver);
5000         if (rc)
5001                 fc_release_transport(ibmvfc_transport_template);
5002         return rc;
5003 }
5004
5005 /**
5006  * ibmvfc_module_exit - Teardown the ibmvfc module
5007  *
5008  * Return value:
5009  *      nothing
5010  **/
5011 static void __exit ibmvfc_module_exit(void)
5012 {
5013         vio_unregister_driver(&ibmvfc_driver);
5014         fc_release_transport(ibmvfc_transport_template);
5015 }
5016
5017 module_init(ibmvfc_module_init);
5018 module_exit(ibmvfc_module_exit);