drivers/scsi/ibmvscsi/ibmvfc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
   4  *
   5  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
   6  *
   7  * Copyright (C) IBM Corporation, 2008
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/moduleparam.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/dmapool.h>
  14 #include <linux/delay.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/kthread.h>
  17 #include <linux/slab.h>
  18 #include <linux/of.h>
  19 #include <linux/pm.h>
  20 #include <linux/stringify.h>
  21 #include <linux/bsg-lib.h>
  22 #include <asm/firmware.h>
  23 #include <asm/irq.h>
  24 #include <asm/vio.h>
  25 #include <scsi/scsi.h>
  26 #include <scsi/scsi_cmnd.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/scsi_tcq.h>
  30 #include <scsi/scsi_transport_fc.h>
  31 #include <scsi/scsi_bsg_fc.h>
  32 #include "ibmvfc.h"
  33
  34 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  35 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  36 static u64 max_lun = IBMVFC_MAX_LUN;
  37 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  38 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  39 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  40 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  41 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  42 static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
  43 static LIST_HEAD(ibmvfc_head);
  44 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  45 static struct scsi_transport_template *ibmvfc_transport_template;
  46
  47 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  48 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  49 MODULE_LICENSE("GPL");
  50 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  51
  52 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  53 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  54                  "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  55 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  56 MODULE_PARM_DESC(default_timeout,
  57                  "Default timeout in seconds for initialization and EH commands. "
  58                  "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  59 module_param_named(max_requests, max_requests, uint, S_IRUGO);
  60 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  61                  "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  62 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
  63 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  64                  "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  65 module_param_named(max_targets, max_targets, uint, S_IRUGO);
  66 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  67                  "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  68 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
  69 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
  70                  "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
  71 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
  72 MODULE_PARM_DESC(debug, "Enable driver debug information. "
  73                  "[Default=" __stringify(IBMVFC_DEBUG) "]");
  74 module_param_named(log_level, log_level, uint, 0);
  75 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
  76                  "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
  77 module_param_named(cls3_error, cls3_error, uint, 0);
  78 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
  79                  "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
  80
  81 static const struct {
  82         u16 status;
  83         u16 error;
  84         u8 result;
  85         u8 retry;
  86         int log;
  87         char *name;
  88 } cmd_status [] = {
  89         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
  90         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
  91         { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
  92         { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
  93         { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
  94         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
  95         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
  96         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
  97         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
  98         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
  99         { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 100         { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 101         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 102         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 103
 104         { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 105         { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 106         { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 107         { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 108         { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 109         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 110         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 111         { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 112         { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 113         { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 114
 115         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 116         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 117         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 118         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 119         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 120         { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 121         { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 122         { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 123         { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 124         { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 125         { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 126
 127         { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 128         { IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
 129 };
 130
 131 static void ibmvfc_npiv_login(struct ibmvfc_host *);
 132 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 133 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 134 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 135 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 136
 137 static const char *unknown_error = "unknown error";
 138
 139 #ifdef CONFIG_SCSI_IBMVFC_TRACE
 140 /**
 141  * ibmvfc_trc_start - Log a start trace entry
 142  * @evt:                ibmvfc event struct
 143  *
 144  **/
 145 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 146 {
 147         struct ibmvfc_host *vhost = evt->vhost;
 148         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 149         struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 150         struct ibmvfc_trace_entry *entry;
 151
 152         entry = &vhost->trace[vhost->trace_index++];
 153         entry->evt = evt;
 154         entry->time = jiffies;
 155         entry->fmt = evt->crq.format;
 156         entry->type = IBMVFC_TRC_START;
 157
 158         switch (entry->fmt) {
 159         case IBMVFC_CMD_FORMAT:
 160                 entry->op_code = vfc_cmd->iu.cdb[0];
 161                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 162                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 163                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 164                 entry->u.start.xfer_len = be32_to_cpu(vfc_cmd->iu.xfer_len);
 165                 break;
 166         case IBMVFC_MAD_FORMAT:
 167                 entry->op_code = be32_to_cpu(mad->opcode);
 168                 break;
 169         default:
 170                 break;
 171         }
 172 }
 173
 174 /**
 175  * ibmvfc_trc_end - Log an end trace entry
 176  * @evt:                ibmvfc event struct
 177  *
 178  **/
 179 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 180 {
 181         struct ibmvfc_host *vhost = evt->vhost;
 182         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 183         struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 184         struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
 185
 186         entry->evt = evt;
 187         entry->time = jiffies;
 188         entry->fmt = evt->crq.format;
 189         entry->type = IBMVFC_TRC_END;
 190
 191         switch (entry->fmt) {
 192         case IBMVFC_CMD_FORMAT:
 193                 entry->op_code = vfc_cmd->iu.cdb[0];
 194                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 195                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 196                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 197                 entry->u.end.status = be16_to_cpu(vfc_cmd->status);
 198                 entry->u.end.error = be16_to_cpu(vfc_cmd->error);
 199                 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
 200                 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
 201                 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
 202                 break;
 203         case IBMVFC_MAD_FORMAT:
 204                 entry->op_code = be32_to_cpu(mad->opcode);
 205                 entry->u.end.status = be16_to_cpu(mad->status);
 206                 break;
 207         default:
 208                 break;
 209
 210         }
 211 }
 212
 213 #else
 214 #define ibmvfc_trc_start(evt) do { } while (0)
 215 #define ibmvfc_trc_end(evt) do { } while (0)
 216 #endif
 217
 218 /**
 219  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 220  * @status:             status / error class
 221  * @error:              error
 222  *
 223  * Return value:
 224  *      index into cmd_status / -EINVAL on failure
 225  **/
 226 static int ibmvfc_get_err_index(u16 status, u16 error)
 227 {
 228         int i;
 229
 230         for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 231                 if ((cmd_status[i].status & status) == cmd_status[i].status &&
 232                     cmd_status[i].error == error)
 233                         return i;
 234
 235         return -EINVAL;
 236 }
 237
 238 /**
 239  * ibmvfc_get_cmd_error - Find the error description for the fcp response
 240  * @status:             status / error class
 241  * @error:              error
 242  *
 243  * Return value:
 244  *      error description string
 245  **/
 246 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 247 {
 248         int rc = ibmvfc_get_err_index(status, error);
 249         if (rc >= 0)
 250                 return cmd_status[rc].name;
 251         return unknown_error;
 252 }
 253
 254 /**
 255  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 256  * @vfc_cmd:    ibmvfc command struct
 257  *
 258  * Return value:
 259  *      SCSI result value to return for completed command
 260  **/
 261 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
 262 {
 263         int err;
 264         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
 265         int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
 266
 267         if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 268             ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 269              rsp->data.info.rsp_code))
 270                 return DID_ERROR << 16;
 271
 272         err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
 273         if (err >= 0)
 274                 return rsp->scsi_status | (cmd_status[err].result << 16);
 275         return rsp->scsi_status | (DID_ERROR << 16);
 276 }
 277
 278 /**
 279  * ibmvfc_retry_cmd - Determine if error status is retryable
 280  * @status:             status / error class
 281  * @error:              error
 282  *
 283  * Return value:
 284  *      1 if error should be retried / 0 if it should not
 285  **/
 286 static int ibmvfc_retry_cmd(u16 status, u16 error)
 287 {
 288         int rc = ibmvfc_get_err_index(status, error);
 289
 290         if (rc >= 0)
 291                 return cmd_status[rc].retry;
 292         return 1;
 293 }
 294
 295 static const char *unknown_fc_explain = "unknown fc explain";
 296
 297 static const struct {
 298         u16 fc_explain;
 299         char *name;
 300 } ls_explain [] = {
 301         { 0x00, "no additional explanation" },
 302         { 0x01, "service parameter error - options" },
 303         { 0x03, "service parameter error - initiator control" },
 304         { 0x05, "service parameter error - recipient control" },
 305         { 0x07, "service parameter error - received data field size" },
 306         { 0x09, "service parameter error - concurrent seq" },
 307         { 0x0B, "service parameter error - credit" },
 308         { 0x0D, "invalid N_Port/F_Port_Name" },
 309         { 0x0E, "invalid node/Fabric Name" },
 310         { 0x0F, "invalid common service parameters" },
 311         { 0x11, "invalid association header" },
 312         { 0x13, "association header required" },
 313         { 0x15, "invalid originator S_ID" },
 314         { 0x17, "invalid OX_ID-RX-ID combination" },
 315         { 0x19, "command (request) already in progress" },
 316         { 0x1E, "N_Port Login requested" },
 317         { 0x1F, "Invalid N_Port_ID" },
 318 };
 319
 320 static const struct {
 321         u16 fc_explain;
 322         char *name;
 323 } gs_explain [] = {
 324         { 0x00, "no additional explanation" },
 325         { 0x01, "port identifier not registered" },
 326         { 0x02, "port name not registered" },
 327         { 0x03, "node name not registered" },
 328         { 0x04, "class of service not registered" },
 329         { 0x06, "initial process associator not registered" },
 330         { 0x07, "FC-4 TYPEs not registered" },
 331         { 0x08, "symbolic port name not registered" },
 332         { 0x09, "symbolic node name not registered" },
 333         { 0x0A, "port type not registered" },
 334         { 0xF0, "authorization exception" },
 335         { 0xF1, "authentication exception" },
 336         { 0xF2, "data base full" },
 337         { 0xF3, "data base empty" },
 338         { 0xF4, "processing request" },
 339         { 0xF5, "unable to verify connection" },
 340         { 0xF6, "devices not in a common zone" },
 341 };
 342
 343 /**
 344  * ibmvfc_get_ls_explain - Return the FC Explain description text
 345  * @status:     FC Explain status
 346  *
 347  * Returns:
 348  *      error string
 349  **/
 350 static const char *ibmvfc_get_ls_explain(u16 status)
 351 {
 352         int i;
 353
 354         for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 355                 if (ls_explain[i].fc_explain == status)
 356                         return ls_explain[i].name;
 357
 358         return unknown_fc_explain;
 359 }
 360
 361 /**
 362  * ibmvfc_get_gs_explain - Return the FC Explain description text
 363  * @status:     FC Explain status
 364  *
 365  * Returns:
 366  *      error string
 367  **/
 368 static const char *ibmvfc_get_gs_explain(u16 status)
 369 {
 370         int i;
 371
 372         for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 373                 if (gs_explain[i].fc_explain == status)
 374                         return gs_explain[i].name;
 375
 376         return unknown_fc_explain;
 377 }
 378
 379 static const struct {
 380         enum ibmvfc_fc_type fc_type;
 381         char *name;
 382 } fc_type [] = {
 383         { IBMVFC_FABRIC_REJECT, "fabric reject" },
 384         { IBMVFC_PORT_REJECT, "port reject" },
 385         { IBMVFC_LS_REJECT, "ELS reject" },
 386         { IBMVFC_FABRIC_BUSY, "fabric busy" },
 387         { IBMVFC_PORT_BUSY, "port busy" },
 388         { IBMVFC_BASIC_REJECT, "basic reject" },
 389 };
 390
 391 static const char *unknown_fc_type = "unknown fc type";
 392
 393 /**
 394  * ibmvfc_get_fc_type - Return the FC Type description text
 395  * @status:     FC Type error status
 396  *
 397  * Returns:
 398  *      error string
 399  **/
 400 static const char *ibmvfc_get_fc_type(u16 status)
 401 {
 402         int i;
 403
 404         for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 405                 if (fc_type[i].fc_type == status)
 406                         return fc_type[i].name;
 407
 408         return unknown_fc_type;
 409 }
 410
 411 /**
 412  * ibmvfc_set_tgt_action - Set the next init action for the target
 413  * @tgt:                ibmvfc target struct
 414  * @action:             action to perform
 415  *
 416  **/
 417 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 418                                   enum ibmvfc_target_action action)
 419 {
 420         switch (tgt->action) {
 421         case IBMVFC_TGT_ACTION_DEL_RPORT:
 422                 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
 423                         tgt->action = action;
 424         case IBMVFC_TGT_ACTION_DELETED_RPORT:
 425                 break;
 426         default:
 427                 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
 428                         tgt->add_rport = 0;
 429                 tgt->action = action;
 430                 break;
 431         }
 432 }
 433
 434 /**
 435  * ibmvfc_set_host_state - Set the state for the host
 436  * @vhost:              ibmvfc host struct
 437  * @state:              state to set host to
 438  *
 439  * Returns:
 440  *      0 if state changed / non-zero if not changed
 441  **/
 442 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
 443                                   enum ibmvfc_host_state state)
 444 {
 445         int rc = 0;
 446
 447         switch (vhost->state) {
 448         case IBMVFC_HOST_OFFLINE:
 449                 rc = -EINVAL;
 450                 break;
 451         default:
 452                 vhost->state = state;
 453                 break;
 454         }
 455
 456         return rc;
 457 }
 458
 459 /**
 460  * ibmvfc_set_host_action - Set the next init action for the host
 461  * @vhost:              ibmvfc host struct
 462  * @action:             action to perform
 463  *
 464  **/
 465 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 466                                    enum ibmvfc_host_action action)
 467 {
 468         switch (action) {
 469         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 470                 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
 471                         vhost->action = action;
 472                 break;
 473         case IBMVFC_HOST_ACTION_LOGO_WAIT:
 474                 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
 475                         vhost->action = action;
 476                 break;
 477         case IBMVFC_HOST_ACTION_INIT_WAIT:
 478                 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
 479                         vhost->action = action;
 480                 break;
 481         case IBMVFC_HOST_ACTION_QUERY:
 482                 switch (vhost->action) {
 483                 case IBMVFC_HOST_ACTION_INIT_WAIT:
 484                 case IBMVFC_HOST_ACTION_NONE:
 485                 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 486                         vhost->action = action;
 487                         break;
 488                 default:
 489                         break;
 490                 }
 491                 break;
 492         case IBMVFC_HOST_ACTION_TGT_INIT:
 493                 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 494                         vhost->action = action;
 495                 break;
 496         case IBMVFC_HOST_ACTION_INIT:
 497         case IBMVFC_HOST_ACTION_TGT_DEL:
 498                 switch (vhost->action) {
 499                 case IBMVFC_HOST_ACTION_RESET:
 500                 case IBMVFC_HOST_ACTION_REENABLE:
 501                         break;
 502                 default:
 503                         vhost->action = action;
 504                         break;
 505                 }
 506                 break;
 507         case IBMVFC_HOST_ACTION_LOGO:
 508         case IBMVFC_HOST_ACTION_QUERY_TGTS:
 509         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 510         case IBMVFC_HOST_ACTION_NONE:
 511         case IBMVFC_HOST_ACTION_RESET:
 512         case IBMVFC_HOST_ACTION_REENABLE:
 513         default:
 514                 vhost->action = action;
 515                 break;
 516         }
 517 }
 518
 519 /**
 520  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 521  * @vhost:              ibmvfc host struct
 522  *
 523  * Return value:
 524  *      nothing
 525  **/
 526 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 527 {
 528         if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
 529                 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 530                         scsi_block_requests(vhost->host);
 531                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 532                 }
 533         } else
 534                 vhost->reinit = 1;
 535
 536         wake_up(&vhost->work_wait_q);
 537 }
 538
 539 /**
 540  * ibmvfc_link_down - Handle a link down event from the adapter
 541  * @vhost:      ibmvfc host struct
 542  * @state:      ibmvfc host state to enter
 543  *
 544  **/
 545 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 546                              enum ibmvfc_host_state state)
 547 {
 548         struct ibmvfc_target *tgt;
 549
 550         ENTER;
 551         scsi_block_requests(vhost->host);
 552         list_for_each_entry(tgt, &vhost->targets, queue)
 553                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 554         ibmvfc_set_host_state(vhost, state);
 555         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 556         vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 557         wake_up(&vhost->work_wait_q);
 558         LEAVE;
 559 }
 560
 561 /**
 562  * ibmvfc_init_host - Start host initialization
 563  * @vhost:              ibmvfc host struct
 564  *
 565  * Return value:
 566  *      nothing
 567  **/
 568 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
 569 {
 570         struct ibmvfc_target *tgt;
 571
 572         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 573                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 574                         dev_err(vhost->dev,
 575                                 "Host initialization retries exceeded. Taking adapter offline\n");
 576                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 577                         return;
 578                 }
 579         }
 580
 581         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 582                 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
 583                 vhost->async_crq.cur = 0;
 584
 585                 list_for_each_entry(tgt, &vhost->targets, queue)
 586                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 587                 scsi_block_requests(vhost->host);
 588                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 589                 vhost->job_step = ibmvfc_npiv_login;
 590                 wake_up(&vhost->work_wait_q);
 591         }
 592 }
 593
 594 /**
 595  * ibmvfc_send_crq - Send a CRQ
 596  * @vhost:      ibmvfc host struct
 597  * @word1:      the first 64 bits of the data
 598  * @word2:      the second 64 bits of the data
 599  *
 600  * Return value:
 601  *      0 on success / other on failure
 602  **/
 603 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 604 {
 605         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 606         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 607 }
 608
 609 /**
 610  * ibmvfc_send_crq_init - Send a CRQ init message
 611  * @vhost:      ibmvfc host struct
 612  *
 613  * Return value:
 614  *      0 on success / other on failure
 615  **/
 616 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
 617 {
 618         ibmvfc_dbg(vhost, "Sending CRQ init\n");
 619         return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 620 }
 621
 622 /**
 623  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 624  * @vhost:      ibmvfc host struct
 625  *
 626  * Return value:
 627  *      0 on success / other on failure
 628  **/
 629 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 630 {
 631         ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 632         return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 633 }
 634
 635 /**
 636  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 637  * @vhost:      ibmvfc host struct
 638  *
 639  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 640  * the crq with the hypervisor.
 641  **/
 642 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 643 {
 644         long rc = 0;
 645         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 646         struct ibmvfc_crq_queue *crq = &vhost->crq;
 647
 648         ibmvfc_dbg(vhost, "Releasing CRQ\n");
 649         free_irq(vdev->irq, vhost);
 650         tasklet_kill(&vhost->tasklet);
 651         do {
 652                 if (rc)
 653                         msleep(100);
 654                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 655         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 656
 657         vhost->state = IBMVFC_NO_CRQ;
 658         vhost->logged_in = 0;
 659         dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 660         free_page((unsigned long)crq->msgs);
 661 }
 662
 663 /**
 664  * ibmvfc_reenable_crq_queue - reenables the CRQ
 665  * @vhost:      ibmvfc host struct
 666  *
 667  * Return value:
 668  *      0 on success / other on failure
 669  **/
 670 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 671 {
 672         int rc = 0;
 673         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 674
 675         /* Re-enable the CRQ */
 676         do {
 677                 if (rc)
 678                         msleep(100);
 679                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 680         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 681
 682         if (rc)
 683                 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 684
 685         return rc;
 686 }
 687
 688 /**
 689  * ibmvfc_reset_crq - resets a crq after a failure
 690  * @vhost:      ibmvfc host struct
 691  *
 692  * Return value:
 693  *      0 on success / other on failure
 694  **/
 695 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 696 {
 697         int rc = 0;
 698         unsigned long flags;
 699         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 700         struct ibmvfc_crq_queue *crq = &vhost->crq;
 701
 702         /* Close the CRQ */
 703         do {
 704                 if (rc)
 705                         msleep(100);
 706                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 707         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 708
 709         spin_lock_irqsave(vhost->host->host_lock, flags);
 710         vhost->state = IBMVFC_NO_CRQ;
 711         vhost->logged_in = 0;
 712
 713         /* Clean out the queue */
 714         memset(crq->msgs, 0, PAGE_SIZE);
 715         crq->cur = 0;
 716
 717         /* And re-open it again */
 718         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 719                                 crq->msg_token, PAGE_SIZE);
 720
 721         if (rc == H_CLOSED)
 722                 /* Adapter is good, but other end is not ready */
 723                 dev_warn(vhost->dev, "Partner adapter not ready\n");
 724         else if (rc != 0)
 725                 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 726         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 727
 728         return rc;
 729 }
 730
 731 /**
 732  * ibmvfc_valid_event - Determines if event is valid.
 733  * @pool:       event_pool that contains the event
 734  * @evt:        ibmvfc event to be checked for validity
 735  *
 736  * Return value:
 737  *      1 if event is valid / 0 if event is not valid
 738  **/
 739 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
 740                               struct ibmvfc_event *evt)
 741 {
 742         int index = evt - pool->events;
 743         if (index < 0 || index >= pool->size)   /* outside of bounds */
 744                 return 0;
 745         if (evt != pool->events + index)        /* unaligned */
 746                 return 0;
 747         return 1;
 748 }
 749
 750 /**
 751  * ibmvfc_free_event - Free the specified event
 752  * @evt:        ibmvfc_event to be freed
 753  *
 754  **/
 755 static void ibmvfc_free_event(struct ibmvfc_event *evt)
 756 {
 757         struct ibmvfc_host *vhost = evt->vhost;
 758         struct ibmvfc_event_pool *pool = &vhost->pool;
 759
 760         BUG_ON(!ibmvfc_valid_event(pool, evt));
 761         BUG_ON(atomic_inc_return(&evt->free) != 1);
 762         list_add_tail(&evt->queue, &vhost->free);
 763 }
 764
 765 /**
 766  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
 767  * @evt:        ibmvfc event struct
 768  *
 769  * This function does not setup any error status, that must be done
 770  * before this function gets called.
 771  **/
 772 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
 773 {
 774         struct scsi_cmnd *cmnd = evt->cmnd;
 775
 776         if (cmnd) {
 777                 scsi_dma_unmap(cmnd);
 778                 cmnd->scsi_done(cmnd);
 779         }
 780
 781         if (evt->eh_comp)
 782                 complete(evt->eh_comp);
 783
 784         ibmvfc_free_event(evt);
 785 }
 786
 787 /**
 788  * ibmvfc_fail_request - Fail request with specified error code
 789  * @evt:                ibmvfc event struct
 790  * @error_code: error code to fail request with
 791  *
 792  * Return value:
 793  *      none
 794  **/
 795 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
 796 {
 797         if (evt->cmnd) {
 798                 evt->cmnd->result = (error_code << 16);
 799                 evt->done = ibmvfc_scsi_eh_done;
 800         } else
 801                 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
 802
 803         list_del(&evt->queue);
 804         del_timer(&evt->timer);
 805         ibmvfc_trc_end(evt);
 806         evt->done(evt);
 807 }
 808
 809 /**
 810  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
 811  * @vhost:              ibmvfc host struct
 812  * @error_code: error code to fail requests with
 813  *
 814  * Return value:
 815  *      none
 816  **/
 817 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
 818 {
 819         struct ibmvfc_event *evt, *pos;
 820
 821         ibmvfc_dbg(vhost, "Purging all requests\n");
 822         list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
 823                 ibmvfc_fail_request(evt, error_code);
 824 }
 825
 826 /**
 827  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
 828  * @vhost:      struct ibmvfc host to reset
 829  **/
 830 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
 831 {
 832         ibmvfc_purge_requests(vhost, DID_ERROR);
 833         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
 834         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
 835 }
 836
 837 /**
 838  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
 839  * @vhost:      struct ibmvfc host to reset
 840  **/
 841 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
 842 {
 843         if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
 844             !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 845                 scsi_block_requests(vhost->host);
 846                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
 847                 vhost->job_step = ibmvfc_npiv_logout;
 848                 wake_up(&vhost->work_wait_q);
 849         } else
 850                 ibmvfc_hard_reset_host(vhost);
 851 }
 852
 853 /**
 854  * ibmvfc_reset_host - Reset the connection to the server
 855  * @vhost:      ibmvfc host struct
 856  **/
 857 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
 858 {
 859         unsigned long flags;
 860
 861         spin_lock_irqsave(vhost->host->host_lock, flags);
 862         __ibmvfc_reset_host(vhost);
 863         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 864 }
 865
 866 /**
 867  * ibmvfc_retry_host_init - Retry host initialization if allowed
 868  * @vhost:      ibmvfc host struct
 869  *
 870  * Returns: 1 if init will be retried / 0 if not
 871  *
 872  **/
 873 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
 874 {
 875         int retry = 0;
 876
 877         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 878                 vhost->delay_init = 1;
 879                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 880                         dev_err(vhost->dev,
 881                                 "Host initialization retries exceeded. Taking adapter offline\n");
 882                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 883                 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
 884                         __ibmvfc_reset_host(vhost);
 885                 else {
 886                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 887                         retry = 1;
 888                 }
 889         }
 890
 891         wake_up(&vhost->work_wait_q);
 892         return retry;
 893 }
 894
 895 /**
 896  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
 897  * @starget:    scsi target struct
 898  *
 899  * Return value:
 900  *      ibmvfc_target struct / NULL if not found
 901  **/
 902 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
 903 {
 904         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 905         struct ibmvfc_host *vhost = shost_priv(shost);
 906         struct ibmvfc_target *tgt;
 907
 908         list_for_each_entry(tgt, &vhost->targets, queue)
 909                 if (tgt->target_id == starget->id) {
 910                         kref_get(&tgt->kref);
 911                         return tgt;
 912                 }
 913         return NULL;
 914 }
 915
 916 /**
 917  * ibmvfc_get_target - Find the specified scsi_target
 918  * @starget:    scsi target struct
 919  *
 920  * Return value:
 921  *      ibmvfc_target struct / NULL if not found
 922  **/
 923 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
 924 {
 925         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 926         struct ibmvfc_target *tgt;
 927         unsigned long flags;
 928
 929         spin_lock_irqsave(shost->host_lock, flags);
 930         tgt = __ibmvfc_get_target(starget);
 931         spin_unlock_irqrestore(shost->host_lock, flags);
 932         return tgt;
 933 }
 934
 935 /**
 936  * ibmvfc_get_host_speed - Get host port speed
 937  * @shost:              scsi host struct
 938  *
 939  * Return value:
 940  *      none
 941  **/
 942 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
 943 {
 944         struct ibmvfc_host *vhost = shost_priv(shost);
 945         unsigned long flags;
 946
 947         spin_lock_irqsave(shost->host_lock, flags);
 948         if (vhost->state == IBMVFC_ACTIVE) {
 949                 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
 950                 case 1:
 951                         fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
 952                         break;
 953                 case 2:
 954                         fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
 955                         break;
 956                 case 4:
 957                         fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
 958                         break;
 959                 case 8:
 960                         fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
 961                         break;
 962                 case 10:
 963                         fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
 964                         break;
 965                 case 16:
 966                         fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
 967                         break;
 968                 default:
 969                         ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
 970                                    be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
 971                         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 972                         break;
 973                 }
 974         } else
 975                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 976         spin_unlock_irqrestore(shost->host_lock, flags);
 977 }
 978
 979 /**
 980  * ibmvfc_get_host_port_state - Get host port state
 981  * @shost:              scsi host struct
 982  *
 983  * Return value:
 984  *      none
 985  **/
 986 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
 987 {
 988         struct ibmvfc_host *vhost = shost_priv(shost);
 989         unsigned long flags;
 990
 991         spin_lock_irqsave(shost->host_lock, flags);
 992         switch (vhost->state) {
 993         case IBMVFC_INITIALIZING:
 994         case IBMVFC_ACTIVE:
 995                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 996                 break;
 997         case IBMVFC_LINK_DOWN:
 998                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 999                 break;
1000         case IBMVFC_LINK_DEAD:
1001         case IBMVFC_HOST_OFFLINE:
1002                 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1003                 break;
1004         case IBMVFC_HALTED:
1005                 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1006                 break;
1007         case IBMVFC_NO_CRQ:
1008                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1009                 break;
1010         default:
1011                 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1012                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1013                 break;
1014         }
1015         spin_unlock_irqrestore(shost->host_lock, flags);
1016 }
1017
1018 /**
1019  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1020  * @rport:              rport struct
1021  * @timeout:    timeout value
1022  *
1023  * Return value:
1024  *      none
1025  **/
1026 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1027 {
1028         if (timeout)
1029                 rport->dev_loss_tmo = timeout;
1030         else
1031                 rport->dev_loss_tmo = 1;
1032 }
1033
1034 /**
1035  * ibmvfc_release_tgt - Free memory allocated for a target
1036  * @kref:               kref struct
1037  *
1038  **/
1039 static void ibmvfc_release_tgt(struct kref *kref)
1040 {
1041         struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1042         kfree(tgt);
1043 }
1044
1045 /**
1046  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1047  * @starget:    scsi target struct
1048  *
1049  * Return value:
1050  *      none
1051  **/
1052 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1053 {
1054         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1055         fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1056         if (tgt)
1057                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1058 }
1059
1060 /**
1061  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1062  * @starget:    scsi target struct
1063  *
1064  * Return value:
1065  *      none
1066  **/
1067 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1068 {
1069         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1070         fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1071         if (tgt)
1072                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1073 }
1074
1075 /**
1076  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1077  * @starget:    scsi target struct
1078  *
1079  * Return value:
1080  *      none
1081  **/
1082 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1083 {
1084         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1085         fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1086         if (tgt)
1087                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1088 }
1089
1090 /**
1091  * ibmvfc_wait_while_resetting - Wait while the host resets
1092  * @vhost:              ibmvfc host struct
1093  *
1094  * Return value:
1095  *      0 on success / other on failure
1096  **/
1097 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1098 {
1099         long timeout = wait_event_timeout(vhost->init_wait_q,
1100                                           ((vhost->state == IBMVFC_ACTIVE ||
1101                                             vhost->state == IBMVFC_HOST_OFFLINE ||
1102                                             vhost->state == IBMVFC_LINK_DEAD) &&
1103                                            vhost->action == IBMVFC_HOST_ACTION_NONE),
1104                                           (init_timeout * HZ));
1105
1106         return timeout ? 0 : -EIO;
1107 }
1108
1109 /**
1110  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1111  * @shost:              scsi host struct
1112  *
1113  * Return value:
1114  *      0 on success / other on failure
1115  **/
1116 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1117 {
1118         struct ibmvfc_host *vhost = shost_priv(shost);
1119
1120         dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1121         ibmvfc_reset_host(vhost);
1122         return ibmvfc_wait_while_resetting(vhost);
1123 }
1124
1125 /**
1126  * ibmvfc_gather_partition_info - Gather info about the LPAR
1127  *
1128  * Return value:
1129  *      none
1130  **/
1131 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1132 {
1133         struct device_node *rootdn;
1134         const char *name;
1135         const unsigned int *num;
1136
1137         rootdn = of_find_node_by_path("/");
1138         if (!rootdn)
1139                 return;
1140
1141         name = of_get_property(rootdn, "ibm,partition-name", NULL);
1142         if (name)
1143                 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1144         num = of_get_property(rootdn, "ibm,partition-no", NULL);
1145         if (num)
1146                 vhost->partition_number = *num;
1147         of_node_put(rootdn);
1148 }
1149
1150 /**
1151  * ibmvfc_set_login_info - Setup info for NPIV login
1152  * @vhost:      ibmvfc host struct
1153  *
1154  * Return value:
1155  *      none
1156  **/
1157 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1158 {
1159         struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1160         struct device_node *of_node = vhost->dev->of_node;
1161         const char *location;
1162
1163         memset(login_info, 0, sizeof(*login_info));
1164
1165         login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1166         login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1167         login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1168         login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1169         login_info->partition_num = cpu_to_be32(vhost->partition_number);
1170         login_info->vfc_frame_version = cpu_to_be32(1);
1171         login_info->fcp_version = cpu_to_be16(3);
1172         login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1173         if (vhost->client_migrated)
1174                 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1175
1176         login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1177         login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE);
1178         login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1179         login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs));
1180         strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1181         strncpy(login_info->device_name,
1182                 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1183
1184         location = of_get_property(of_node, "ibm,loc-code", NULL);
1185         location = location ? location : dev_name(vhost->dev);
1186         strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1187 }
1188
1189 /**
1190  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1191  * @vhost:      ibmvfc host who owns the event pool
1192  *
1193  * Returns zero on success.
1194  **/
1195 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1196 {
1197         int i;
1198         struct ibmvfc_event_pool *pool = &vhost->pool;
1199
1200         ENTER;
1201         pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1202         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1203         if (!pool->events)
1204                 return -ENOMEM;
1205
1206         pool->iu_storage = dma_alloc_coherent(vhost->dev,
1207                                               pool->size * sizeof(*pool->iu_storage),
1208                                               &pool->iu_token, 0);
1209
1210         if (!pool->iu_storage) {
1211                 kfree(pool->events);
1212                 return -ENOMEM;
1213         }
1214
1215         for (i = 0; i < pool->size; ++i) {
1216                 struct ibmvfc_event *evt = &pool->events[i];
1217                 atomic_set(&evt->free, 1);
1218                 evt->crq.valid = 0x80;
1219                 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
1220                 evt->xfer_iu = pool->iu_storage + i;
1221                 evt->vhost = vhost;
1222                 evt->ext_list = NULL;
1223                 list_add_tail(&evt->queue, &vhost->free);
1224         }
1225
1226         LEAVE;
1227         return 0;
1228 }
1229
1230 /**
1231  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1232  * @vhost:      ibmvfc host who owns the event pool
1233  *
1234  **/
1235 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1236 {
1237         int i;
1238         struct ibmvfc_event_pool *pool = &vhost->pool;
1239
1240         ENTER;
1241         for (i = 0; i < pool->size; ++i) {
1242                 list_del(&pool->events[i].queue);
1243                 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1244                 if (pool->events[i].ext_list)
1245                         dma_pool_free(vhost->sg_pool,
1246                                       pool->events[i].ext_list,
1247                                       pool->events[i].ext_list_token);
1248         }
1249
1250         kfree(pool->events);
1251         dma_free_coherent(vhost->dev,
1252                           pool->size * sizeof(*pool->iu_storage),
1253                           pool->iu_storage, pool->iu_token);
1254         LEAVE;
1255 }
1256
1257 /**
1258  * ibmvfc_get_event - Gets the next free event in pool
1259  * @vhost:      ibmvfc host struct
1260  *
1261  * Returns a free event from the pool.
1262  **/
1263 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1264 {
1265         struct ibmvfc_event *evt;
1266
1267         BUG_ON(list_empty(&vhost->free));
1268         evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1269         atomic_set(&evt->free, 0);
1270         list_del(&evt->queue);
1271         return evt;
1272 }
1273
1274 /**
1275  * ibmvfc_init_event - Initialize fields in an event struct that are always
1276  *                              required.
1277  * @evt:        The event
1278  * @done:       Routine to call when the event is responded to
1279  * @format:     SRP or MAD format
1280  **/
1281 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1282                               void (*done) (struct ibmvfc_event *), u8 format)
1283 {
1284         evt->cmnd = NULL;
1285         evt->sync_iu = NULL;
1286         evt->crq.format = format;
1287         evt->done = done;
1288         evt->eh_comp = NULL;
1289 }
1290
1291 /**
1292  * ibmvfc_map_sg_list - Initialize scatterlist
1293  * @scmd:       scsi command struct
1294  * @nseg:       number of scatterlist segments
1295  * @md: memory descriptor list to initialize
1296  **/
1297 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1298                                struct srp_direct_buf *md)
1299 {
1300         int i;
1301         struct scatterlist *sg;
1302
1303         scsi_for_each_sg(scmd, sg, nseg, i) {
1304                 md[i].va = cpu_to_be64(sg_dma_address(sg));
1305                 md[i].len = cpu_to_be32(sg_dma_len(sg));
1306                 md[i].key = 0;
1307         }
1308 }
1309
1310 /**
1311  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1312  * @scmd:               struct scsi_cmnd with the scatterlist
1313  * @evt:                ibmvfc event struct
1314  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1315  * @dev:                device for which to map dma memory
1316  *
1317  * Returns:
1318  *      0 on success / non-zero on failure
1319  **/
1320 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1321                               struct ibmvfc_event *evt,
1322                               struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1323 {
1324
1325         int sg_mapped;
1326         struct srp_direct_buf *data = &vfc_cmd->ioba;
1327         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1328
1329         if (cls3_error)
1330                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1331
1332         sg_mapped = scsi_dma_map(scmd);
1333         if (!sg_mapped) {
1334                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1335                 return 0;
1336         } else if (unlikely(sg_mapped < 0)) {
1337                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1338                         scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1339                 return sg_mapped;
1340         }
1341
1342         if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1343                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1344                 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1345         } else {
1346                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1347                 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1348         }
1349
1350         if (sg_mapped == 1) {
1351                 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1352                 return 0;
1353         }
1354
1355         vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1356
1357         if (!evt->ext_list) {
1358                 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1359                                                &evt->ext_list_token);
1360
1361                 if (!evt->ext_list) {
1362                         scsi_dma_unmap(scmd);
1363                         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1364                                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1365                         return -ENOMEM;
1366                 }
1367         }
1368
1369         ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1370
1371         data->va = cpu_to_be64(evt->ext_list_token);
1372         data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1373         data->key = 0;
1374         return 0;
1375 }
1376
1377 /**
1378  * ibmvfc_timeout - Internal command timeout handler
1379  * @evt:        struct ibmvfc_event that timed out
1380  *
1381  * Called when an internally generated command times out
1382  **/
1383 static void ibmvfc_timeout(struct timer_list *t)
1384 {
1385         struct ibmvfc_event *evt = from_timer(evt, t, timer);
1386         struct ibmvfc_host *vhost = evt->vhost;
1387         dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1388         ibmvfc_reset_host(vhost);
1389 }
1390
1391 /**
1392  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1393  * @evt:                event to be sent
1394  * @vhost:              ibmvfc host struct
1395  * @timeout:    timeout in seconds - 0 means do not time command
1396  *
1397  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1398  **/
1399 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1400                              struct ibmvfc_host *vhost, unsigned long timeout)
1401 {
1402         __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1403         int rc;
1404
1405         /* Copy the IU into the transfer area */
1406         *evt->xfer_iu = evt->iu;
1407         if (evt->crq.format == IBMVFC_CMD_FORMAT)
1408                 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1409         else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1410                 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1411         else
1412                 BUG();
1413
1414         list_add_tail(&evt->queue, &vhost->sent);
1415         timer_setup(&evt->timer, ibmvfc_timeout, 0);
1416
1417         if (timeout) {
1418                 evt->timer.expires = jiffies + (timeout * HZ);
1419                 add_timer(&evt->timer);
1420         }
1421
1422         mb();
1423
1424         if ((rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1425                                   be64_to_cpu(crq_as_u64[1])))) {
1426                 list_del(&evt->queue);
1427                 del_timer(&evt->timer);
1428
1429                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1430                  * Firmware will send a CRQ with a transport event (0xFF) to
1431                  * tell this client what has happened to the transport. This
1432                  * will be handled in ibmvfc_handle_crq()
1433                  */
1434                 if (rc == H_CLOSED) {
1435                         if (printk_ratelimit())
1436                                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1437                         if (evt->cmnd)
1438                                 scsi_dma_unmap(evt->cmnd);
1439                         ibmvfc_free_event(evt);
1440                         return SCSI_MLQUEUE_HOST_BUSY;
1441                 }
1442
1443                 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1444                 if (evt->cmnd) {
1445                         evt->cmnd->result = DID_ERROR << 16;
1446                         evt->done = ibmvfc_scsi_eh_done;
1447                 } else
1448                         evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1449
1450                 evt->done(evt);
1451         } else
1452                 ibmvfc_trc_start(evt);
1453
1454         return 0;
1455 }
1456
1457 /**
1458  * ibmvfc_log_error - Log an error for the failed command if appropriate
1459  * @evt:        ibmvfc event to log
1460  *
1461  **/
1462 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1463 {
1464         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1465         struct ibmvfc_host *vhost = evt->vhost;
1466         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1467         struct scsi_cmnd *cmnd = evt->cmnd;
1468         const char *err = unknown_error;
1469         int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1470         int logerr = 0;
1471         int rsp_code = 0;
1472
1473         if (index >= 0) {
1474                 logerr = cmd_status[index].log;
1475                 err = cmd_status[index].name;
1476         }
1477
1478         if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1479                 return;
1480
1481         if (rsp->flags & FCP_RSP_LEN_VALID)
1482                 rsp_code = rsp->data.info.rsp_code;
1483
1484         scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1485                     "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1486                     cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1487                     rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1488 }
1489
1490 /**
1491  * ibmvfc_relogin - Log back into the specified device
1492  * @sdev:       scsi device struct
1493  *
1494  **/
1495 static void ibmvfc_relogin(struct scsi_device *sdev)
1496 {
1497         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1498         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1499         struct ibmvfc_target *tgt;
1500
1501         list_for_each_entry(tgt, &vhost->targets, queue) {
1502                 if (rport == tgt->rport) {
1503                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1504                         break;
1505                 }
1506         }
1507
1508         ibmvfc_reinit_host(vhost);
1509 }
1510
1511 /**
1512  * ibmvfc_scsi_done - Handle responses from commands
1513  * @evt:        ibmvfc event to be handled
1514  *
1515  * Used as a callback when sending scsi cmds.
1516  **/
1517 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1518 {
1519         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1520         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1521         struct scsi_cmnd *cmnd = evt->cmnd;
1522         u32 rsp_len = 0;
1523         u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1524
1525         if (cmnd) {
1526                 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1527                         scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1528                 else if (rsp->flags & FCP_RESID_UNDER)
1529                         scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1530                 else
1531                         scsi_set_resid(cmnd, 0);
1532
1533                 if (vfc_cmd->status) {
1534                         cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1535
1536                         if (rsp->flags & FCP_RSP_LEN_VALID)
1537                                 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1538                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1539                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1540                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1541                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1542                         if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1543                             (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1544                                 ibmvfc_relogin(cmnd->device);
1545
1546                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1547                                 cmnd->result = (DID_ERROR << 16);
1548
1549                         ibmvfc_log_error(evt);
1550                 }
1551
1552                 if (!cmnd->result &&
1553                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1554                         cmnd->result = (DID_ERROR << 16);
1555
1556                 scsi_dma_unmap(cmnd);
1557                 cmnd->scsi_done(cmnd);
1558         }
1559
1560         if (evt->eh_comp)
1561                 complete(evt->eh_comp);
1562
1563         ibmvfc_free_event(evt);
1564 }
1565
1566 /**
1567  * ibmvfc_host_chkready - Check if the host can accept commands
1568  * @vhost:       struct ibmvfc host
1569  *
1570  * Returns:
1571  *      1 if host can accept command / 0 if not
1572  **/
1573 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1574 {
1575         int result = 0;
1576
1577         switch (vhost->state) {
1578         case IBMVFC_LINK_DEAD:
1579         case IBMVFC_HOST_OFFLINE:
1580                 result = DID_NO_CONNECT << 16;
1581                 break;
1582         case IBMVFC_NO_CRQ:
1583         case IBMVFC_INITIALIZING:
1584         case IBMVFC_HALTED:
1585         case IBMVFC_LINK_DOWN:
1586                 result = DID_REQUEUE << 16;
1587                 break;
1588         case IBMVFC_ACTIVE:
1589                 result = 0;
1590                 break;
1591         }
1592
1593         return result;
1594 }
1595
1596 /**
1597  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1598  * @cmnd:       struct scsi_cmnd to be executed
1599  * @done:       Callback function to be called when cmnd is completed
1600  *
1601  * Returns:
1602  *      0 on success / other on failure
1603  **/
1604 static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
1605                                void (*done) (struct scsi_cmnd *))
1606 {
1607         struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1608         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1609         struct ibmvfc_cmd *vfc_cmd;
1610         struct ibmvfc_event *evt;
1611         int rc;
1612
1613         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1614             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1615                 cmnd->result = rc;
1616                 done(cmnd);
1617                 return 0;
1618         }
1619
1620         cmnd->result = (DID_OK << 16);
1621         evt = ibmvfc_get_event(vhost);
1622         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1623         evt->cmnd = cmnd;
1624         cmnd->scsi_done = done;
1625         vfc_cmd = &evt->iu.cmd;
1626         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1627         vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1628         vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1629         vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1630         vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu));
1631         vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1632         vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata);
1633         vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1634         vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1635         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1636         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1637
1638         if (cmnd->flags & SCMD_TAGGED) {
1639                 vfc_cmd->task_tag = cpu_to_be64(cmnd->tag);
1640                 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1641         }
1642
1643         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1644                 return ibmvfc_send_event(evt, vhost, 0);
1645
1646         ibmvfc_free_event(evt);
1647         if (rc == -ENOMEM)
1648                 return SCSI_MLQUEUE_HOST_BUSY;
1649
1650         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1651                 scmd_printk(KERN_ERR, cmnd,
1652                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1653
1654         cmnd->result = DID_ERROR << 16;
1655         done(cmnd);
1656         return 0;
1657 }
1658
1659 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1660
1661 /**
1662  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1663  * @evt:        ibmvfc event struct
1664  *
1665  **/
1666 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1667 {
1668         /* copy the response back */
1669         if (evt->sync_iu)
1670                 *evt->sync_iu = *evt->xfer_iu;
1671
1672         complete(&evt->comp);
1673 }
1674
1675 /**
1676  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1677  * @evt:        struct ibmvfc_event
1678  *
1679  **/
1680 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1681 {
1682         struct ibmvfc_host *vhost = evt->vhost;
1683
1684         ibmvfc_free_event(evt);
1685         vhost->aborting_passthru = 0;
1686         dev_info(vhost->dev, "Passthru command cancelled\n");
1687 }
1688
1689 /**
1690  * ibmvfc_bsg_timeout - Handle a BSG timeout
1691  * @job:        struct bsg_job that timed out
1692  *
1693  * Returns:
1694  *      0 on success / other on failure
1695  **/
1696 static int ibmvfc_bsg_timeout(struct bsg_job *job)
1697 {
1698         struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
1699         unsigned long port_id = (unsigned long)job->dd_data;
1700         struct ibmvfc_event *evt;
1701         struct ibmvfc_tmf *tmf;
1702         unsigned long flags;
1703         int rc;
1704
1705         ENTER;
1706         spin_lock_irqsave(vhost->host->host_lock, flags);
1707         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1708                 __ibmvfc_reset_host(vhost);
1709                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1710                 return 0;
1711         }
1712
1713         vhost->aborting_passthru = 1;
1714         evt = ibmvfc_get_event(vhost);
1715         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1716
1717         tmf = &evt->iu.tmf;
1718         memset(tmf, 0, sizeof(*tmf));
1719         tmf->common.version = cpu_to_be32(1);
1720         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
1721         tmf->common.length = cpu_to_be16(sizeof(*tmf));
1722         tmf->scsi_id = cpu_to_be64(port_id);
1723         tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1724         tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
1725         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1726
1727         if (rc != 0) {
1728                 vhost->aborting_passthru = 0;
1729                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1730                 rc = -EIO;
1731         } else
1732                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1733                          port_id);
1734
1735         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1736
1737         LEAVE;
1738         return rc;
1739 }
1740
1741 /**
1742  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1743  * @vhost:              struct ibmvfc_host to send command
1744  * @port_id:    port ID to send command
1745  *
1746  * Returns:
1747  *      0 on success / other on failure
1748  **/
1749 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1750 {
1751         struct ibmvfc_port_login *plogi;
1752         struct ibmvfc_target *tgt;
1753         struct ibmvfc_event *evt;
1754         union ibmvfc_iu rsp_iu;
1755         unsigned long flags;
1756         int rc = 0, issue_login = 1;
1757
1758         ENTER;
1759         spin_lock_irqsave(vhost->host->host_lock, flags);
1760         list_for_each_entry(tgt, &vhost->targets, queue) {
1761                 if (tgt->scsi_id == port_id) {
1762                         issue_login = 0;
1763                         break;
1764                 }
1765         }
1766
1767         if (!issue_login)
1768                 goto unlock_out;
1769         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1770                 goto unlock_out;
1771
1772         evt = ibmvfc_get_event(vhost);
1773         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1774         plogi = &evt->iu.plogi;
1775         memset(plogi, 0, sizeof(*plogi));
1776         plogi->common.version = cpu_to_be32(1);
1777         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
1778         plogi->common.length = cpu_to_be16(sizeof(*plogi));
1779         plogi->scsi_id = cpu_to_be64(port_id);
1780         evt->sync_iu = &rsp_iu;
1781         init_completion(&evt->comp);
1782
1783         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1784         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1785
1786         if (rc)
1787                 return -EIO;
1788
1789         wait_for_completion(&evt->comp);
1790
1791         if (rsp_iu.plogi.common.status)
1792                 rc = -EIO;
1793
1794         spin_lock_irqsave(vhost->host->host_lock, flags);
1795         ibmvfc_free_event(evt);
1796 unlock_out:
1797         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1798         LEAVE;
1799         return rc;
1800 }
1801
1802 /**
1803  * ibmvfc_bsg_request - Handle a BSG request
1804  * @job:        struct bsg_job to be executed
1805  *
1806  * Returns:
1807  *      0 on success / other on failure
1808  **/
1809 static int ibmvfc_bsg_request(struct bsg_job *job)
1810 {
1811         struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
1812         struct fc_rport *rport = fc_bsg_to_rport(job);
1813         struct ibmvfc_passthru_mad *mad;
1814         struct ibmvfc_event *evt;
1815         union ibmvfc_iu rsp_iu;
1816         unsigned long flags, port_id = -1;
1817         struct fc_bsg_request *bsg_request = job->request;
1818         struct fc_bsg_reply *bsg_reply = job->reply;
1819         unsigned int code = bsg_request->msgcode;
1820         int rc = 0, req_seg, rsp_seg, issue_login = 0;
1821         u32 fc_flags, rsp_len;
1822
1823         ENTER;
1824         bsg_reply->reply_payload_rcv_len = 0;
1825         if (rport)
1826                 port_id = rport->port_id;
1827
1828         switch (code) {
1829         case FC_BSG_HST_ELS_NOLOGIN:
1830                 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
1831                         (bsg_request->rqst_data.h_els.port_id[1] << 8) |
1832                         bsg_request->rqst_data.h_els.port_id[2];
1833         case FC_BSG_RPT_ELS:
1834                 fc_flags = IBMVFC_FC_ELS;
1835                 break;
1836         case FC_BSG_HST_CT:
1837                 issue_login = 1;
1838                 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
1839                         (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
1840                         bsg_request->rqst_data.h_ct.port_id[2];
1841         case FC_BSG_RPT_CT:
1842                 fc_flags = IBMVFC_FC_CT_IU;
1843                 break;
1844         default:
1845                 return -ENOTSUPP;
1846         }
1847
1848         if (port_id == -1)
1849                 return -EINVAL;
1850         if (!mutex_trylock(&vhost->passthru_mutex))
1851                 return -EBUSY;
1852
1853         job->dd_data = (void *)port_id;
1854         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1855                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1856
1857         if (!req_seg) {
1858                 mutex_unlock(&vhost->passthru_mutex);
1859                 return -ENOMEM;
1860         }
1861
1862         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1863                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1864
1865         if (!rsp_seg) {
1866                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1867                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1868                 mutex_unlock(&vhost->passthru_mutex);
1869                 return -ENOMEM;
1870         }
1871
1872         if (req_seg > 1 || rsp_seg > 1) {
1873                 rc = -EINVAL;
1874                 goto out;
1875         }
1876
1877         if (issue_login)
1878                 rc = ibmvfc_bsg_plogi(vhost, port_id);
1879
1880         spin_lock_irqsave(vhost->host->host_lock, flags);
1881
1882         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1883             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1884                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1885                 goto out;
1886         }
1887
1888         evt = ibmvfc_get_event(vhost);
1889         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1890         mad = &evt->iu.passthru;
1891
1892         memset(mad, 0, sizeof(*mad));
1893         mad->common.version = cpu_to_be32(1);
1894         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
1895         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
1896
1897         mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
1898                 offsetof(struct ibmvfc_passthru_mad, iu));
1899         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
1900
1901         mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
1902         mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
1903         mad->iu.flags = cpu_to_be32(fc_flags);
1904         mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1905
1906         mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
1907         mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
1908         mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
1909         mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
1910         mad->iu.scsi_id = cpu_to_be64(port_id);
1911         mad->iu.tag = cpu_to_be64((u64)evt);
1912         rsp_len = be32_to_cpu(mad->iu.rsp.len);
1913
1914         evt->sync_iu = &rsp_iu;
1915         init_completion(&evt->comp);
1916         rc = ibmvfc_send_event(evt, vhost, 0);
1917         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1918
1919         if (rc) {
1920                 rc = -EIO;
1921                 goto out;
1922         }
1923
1924         wait_for_completion(&evt->comp);
1925
1926         if (rsp_iu.passthru.common.status)
1927                 rc = -EIO;
1928         else
1929                 bsg_reply->reply_payload_rcv_len = rsp_len;
1930
1931         spin_lock_irqsave(vhost->host->host_lock, flags);
1932         ibmvfc_free_event(evt);
1933         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1934         bsg_reply->result = rc;
1935         bsg_job_done(job, bsg_reply->result,
1936                        bsg_reply->reply_payload_rcv_len);
1937         rc = 0;
1938 out:
1939         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1940                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
1941         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1942                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1943         mutex_unlock(&vhost->passthru_mutex);
1944         LEAVE;
1945         return rc;
1946 }
1947
1948 /**
1949  * ibmvfc_reset_device - Reset the device with the specified reset type
1950  * @sdev:       scsi device to reset
1951  * @type:       reset type
1952  * @desc:       reset type description for log messages
1953  *
1954  * Returns:
1955  *      0 on success / other on failure
1956  **/
1957 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1958 {
1959         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1960         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1961         struct ibmvfc_cmd *tmf;
1962         struct ibmvfc_event *evt = NULL;
1963         union ibmvfc_iu rsp_iu;
1964         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1965         int rsp_rc = -EBUSY;
1966         unsigned long flags;
1967         int rsp_code = 0;
1968
1969         spin_lock_irqsave(vhost->host->host_lock, flags);
1970         if (vhost->state == IBMVFC_ACTIVE) {
1971                 evt = ibmvfc_get_event(vhost);
1972                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1973
1974                 tmf = &evt->iu.cmd;
1975                 memset(tmf, 0, sizeof(*tmf));
1976                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1977                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
1978                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1979                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
1980                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
1981                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1982                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
1983                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1984                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
1985                 tmf->iu.tmf_flags = type;
1986                 evt->sync_iu = &rsp_iu;
1987
1988                 init_completion(&evt->comp);
1989                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1990         }
1991         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1992
1993         if (rsp_rc != 0) {
1994                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
1995                             desc, rsp_rc);
1996                 return -EIO;
1997         }
1998
1999         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2000         wait_for_completion(&evt->comp);
2001
2002         if (rsp_iu.cmd.status)
2003                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2004
2005         if (rsp_code) {
2006                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2007                         rsp_code = fc_rsp->data.info.rsp_code;
2008
2009                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2010                             "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2011                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2012                             be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2013                             fc_rsp->scsi_status);
2014                 rsp_rc = -EIO;
2015         } else
2016                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2017
2018         spin_lock_irqsave(vhost->host->host_lock, flags);
2019         ibmvfc_free_event(evt);
2020         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2021         return rsp_rc;
2022 }
2023
2024 /**
2025  * ibmvfc_match_rport - Match function for specified remote port
2026  * @evt:        ibmvfc event struct
2027  * @device:     device to match (rport)
2028  *
2029  * Returns:
2030  *      1 if event matches rport / 0 if event does not match rport
2031  **/
2032 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2033 {
2034         struct fc_rport *cmd_rport;
2035
2036         if (evt->cmnd) {
2037                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2038                 if (cmd_rport == rport)
2039                         return 1;
2040         }
2041         return 0;
2042 }
2043
2044 /**
2045  * ibmvfc_match_target - Match function for specified target
2046  * @evt:        ibmvfc event struct
2047  * @device:     device to match (starget)
2048  *
2049  * Returns:
2050  *      1 if event matches starget / 0 if event does not match starget
2051  **/
2052 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2053 {
2054         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2055                 return 1;
2056         return 0;
2057 }
2058
2059 /**
2060  * ibmvfc_match_lun - Match function for specified LUN
2061  * @evt:        ibmvfc event struct
2062  * @device:     device to match (sdev)
2063  *
2064  * Returns:
2065  *      1 if event matches sdev / 0 if event does not match sdev
2066  **/
2067 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2068 {
2069         if (evt->cmnd && evt->cmnd->device == device)
2070                 return 1;
2071         return 0;
2072 }
2073
2074 /**
2075  * ibmvfc_wait_for_ops - Wait for ops to complete
2076  * @vhost:      ibmvfc host struct
2077  * @device:     device to match (starget or sdev)
2078  * @match:      match function
2079  *
2080  * Returns:
2081  *      SUCCESS / FAILED
2082  **/
2083 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2084                                int (*match) (struct ibmvfc_event *, void *))
2085 {
2086         struct ibmvfc_event *evt;
2087         DECLARE_COMPLETION_ONSTACK(comp);
2088         int wait;
2089         unsigned long flags;
2090         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2091
2092         ENTER;
2093         do {
2094                 wait = 0;
2095                 spin_lock_irqsave(vhost->host->host_lock, flags);
2096                 list_for_each_entry(evt, &vhost->sent, queue) {
2097                         if (match(evt, device)) {
2098                                 evt->eh_comp = &comp;
2099                                 wait++;
2100                         }
2101                 }
2102                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2103
2104                 if (wait) {
2105                         timeout = wait_for_completion_timeout(&comp, timeout);
2106
2107                         if (!timeout) {
2108                                 wait = 0;
2109                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2110                                 list_for_each_entry(evt, &vhost->sent, queue) {
2111                                         if (match(evt, device)) {
2112                                                 evt->eh_comp = NULL;
2113                                                 wait++;
2114                                         }
2115                                 }
2116                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2117                                 if (wait)
2118                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2119                                 LEAVE;
2120                                 return wait ? FAILED : SUCCESS;
2121                         }
2122                 }
2123         } while (wait);
2124
2125         LEAVE;
2126         return SUCCESS;
2127 }
2128
2129 /**
2130  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2131  * @sdev:       scsi device to cancel commands
2132  * @type:       type of error recovery being performed
2133  *
2134  * This sends a cancel to the VIOS for the specified device. This does
2135  * NOT send any abort to the actual device. That must be done separately.
2136  *
2137  * Returns:
2138  *      0 on success / other on failure
2139  **/
2140 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2141 {
2142         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2143         struct scsi_target *starget = scsi_target(sdev);
2144         struct fc_rport *rport = starget_to_rport(starget);
2145         struct ibmvfc_tmf *tmf;
2146         struct ibmvfc_event *evt, *found_evt;
2147         union ibmvfc_iu rsp;
2148         int rsp_rc = -EBUSY;
2149         unsigned long flags;
2150         u16 status;
2151
2152         ENTER;
2153         spin_lock_irqsave(vhost->host->host_lock, flags);
2154         found_evt = NULL;
2155         list_for_each_entry(evt, &vhost->sent, queue) {
2156                 if (evt->cmnd && evt->cmnd->device == sdev) {
2157                         found_evt = evt;
2158                         break;
2159                 }
2160         }
2161
2162         if (!found_evt) {
2163                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2164                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2165                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2166                 return 0;
2167         }
2168
2169         if (vhost->logged_in) {
2170                 evt = ibmvfc_get_event(vhost);
2171                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2172
2173                 tmf = &evt->iu.tmf;
2174                 memset(tmf, 0, sizeof(*tmf));
2175                 tmf->common.version = cpu_to_be32(1);
2176                 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2177                 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2178                 tmf->scsi_id = cpu_to_be64(rport->port_id);
2179                 int_to_scsilun(sdev->lun, &tmf->lun);
2180                 if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS))
2181                         type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2182                 if (vhost->state == IBMVFC_ACTIVE)
2183                         tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2184                 else
2185                         tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2186                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2187                 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2188
2189                 evt->sync_iu = &rsp;
2190                 init_completion(&evt->comp);
2191                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2192         }
2193
2194         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2195
2196         if (rsp_rc != 0) {
2197                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2198                 /* If failure is received, the host adapter is most likely going
2199                  through reset, return success so the caller will wait for the command
2200                  being cancelled to get returned */
2201                 return 0;
2202         }
2203
2204         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2205
2206         wait_for_completion(&evt->comp);
2207         status = be16_to_cpu(rsp.mad_common.status);
2208         spin_lock_irqsave(vhost->host->host_lock, flags);
2209         ibmvfc_free_event(evt);
2210         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2211
2212         if (status != IBMVFC_MAD_SUCCESS) {
2213                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2214                 switch (status) {
2215                 case IBMVFC_MAD_DRIVER_FAILED:
2216                 case IBMVFC_MAD_CRQ_ERROR:
2217                         /* Host adapter most likely going through reset, return success to
2218                          the caller will wait for the command being cancelled to get returned */
2219                         return 0;
2220                 default:
2221                         return -EIO;
2222                 };
2223         }
2224
2225         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2226         return 0;
2227 }
2228
2229 /**
2230  * ibmvfc_match_key - Match function for specified cancel key
2231  * @evt:        ibmvfc event struct
2232  * @key:        cancel key to match
2233  *
2234  * Returns:
2235  *      1 if event matches key / 0 if event does not match key
2236  **/
2237 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2238 {
2239         unsigned long cancel_key = (unsigned long)key;
2240
2241         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2242             be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2243                 return 1;
2244         return 0;
2245 }
2246
2247 /**
2248  * ibmvfc_match_evt - Match function for specified event
2249  * @evt:        ibmvfc event struct
2250  * @match:      event to match
2251  *
2252  * Returns:
2253  *      1 if event matches key / 0 if event does not match key
2254  **/
2255 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2256 {
2257         if (evt == match)
2258                 return 1;
2259         return 0;
2260 }
2261
2262 /**
2263  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2264  * @sdev:       scsi device to abort commands
2265  *
2266  * This sends an Abort Task Set to the VIOS for the specified device. This does
2267  * NOT send any cancel to the VIOS. That must be done separately.
2268  *
2269  * Returns:
2270  *      0 on success / other on failure
2271  **/
2272 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2273 {
2274         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2275         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2276         struct ibmvfc_cmd *tmf;
2277         struct ibmvfc_event *evt, *found_evt;
2278         union ibmvfc_iu rsp_iu;
2279         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2280         int rc, rsp_rc = -EBUSY;
2281         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2282         int rsp_code = 0;
2283
2284         spin_lock_irqsave(vhost->host->host_lock, flags);
2285         found_evt = NULL;
2286         list_for_each_entry(evt, &vhost->sent, queue) {
2287                 if (evt->cmnd && evt->cmnd->device == sdev) {
2288                         found_evt = evt;
2289                         break;
2290                 }
2291         }
2292
2293         if (!found_evt) {
2294                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2295                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2296                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2297                 return 0;
2298         }
2299
2300         if (vhost->state == IBMVFC_ACTIVE) {
2301                 evt = ibmvfc_get_event(vhost);
2302                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2303
2304                 tmf = &evt->iu.cmd;
2305                 memset(tmf, 0, sizeof(*tmf));
2306                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
2307                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
2308                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
2309                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
2310                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
2311                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2312                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
2313                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2314                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2315                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2316                 evt->sync_iu = &rsp_iu;
2317
2318                 init_completion(&evt->comp);
2319                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2320         }
2321
2322         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2323
2324         if (rsp_rc != 0) {
2325                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2326                 return -EIO;
2327         }
2328
2329         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2330         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2331
2332         if (!timeout) {
2333                 rc = ibmvfc_cancel_all(sdev, 0);
2334                 if (!rc) {
2335                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2336                         if (rc == SUCCESS)
2337                                 rc = 0;
2338                 }
2339
2340                 if (rc) {
2341                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2342                         ibmvfc_reset_host(vhost);
2343                         rsp_rc = -EIO;
2344                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2345
2346                         if (rc == SUCCESS)
2347                                 rsp_rc = 0;
2348
2349                         rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2350                         if (rc != SUCCESS) {
2351                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2352                                 ibmvfc_hard_reset_host(vhost);
2353                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2354                                 rsp_rc = 0;
2355                         }
2356
2357                         goto out;
2358                 }
2359         }
2360
2361         if (rsp_iu.cmd.status)
2362                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2363
2364         if (rsp_code) {
2365                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2366                         rsp_code = fc_rsp->data.info.rsp_code;
2367
2368                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2369                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2370                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2371                             be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2372                             fc_rsp->scsi_status);
2373                 rsp_rc = -EIO;
2374         } else
2375                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2376
2377 out:
2378         spin_lock_irqsave(vhost->host->host_lock, flags);
2379         ibmvfc_free_event(evt);
2380         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2381         return rsp_rc;
2382 }
2383
2384 /**
2385  * ibmvfc_eh_abort_handler - Abort a command
2386  * @cmd:        scsi command to abort
2387  *
2388  * Returns:
2389  *      SUCCESS / FAST_IO_FAIL / FAILED
2390  **/
2391 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2392 {
2393         struct scsi_device *sdev = cmd->device;
2394         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2395         int cancel_rc, block_rc;
2396         int rc = FAILED;
2397
2398         ENTER;
2399         block_rc = fc_block_scsi_eh(cmd);
2400         ibmvfc_wait_while_resetting(vhost);
2401         if (block_rc != FAST_IO_FAIL) {
2402                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2403                 ibmvfc_abort_task_set(sdev);
2404         } else
2405                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2406
2407         if (!cancel_rc)
2408                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2409
2410         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2411                 rc = FAST_IO_FAIL;
2412
2413         LEAVE;
2414         return rc;
2415 }
2416
2417 /**
2418  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2419  * @cmd:        scsi command struct
2420  *
2421  * Returns:
2422  *      SUCCESS / FAST_IO_FAIL / FAILED
2423  **/
2424 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2425 {
2426         struct scsi_device *sdev = cmd->device;
2427         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2428         int cancel_rc, block_rc, reset_rc = 0;
2429         int rc = FAILED;
2430
2431         ENTER;
2432         block_rc = fc_block_scsi_eh(cmd);
2433         ibmvfc_wait_while_resetting(vhost);
2434         if (block_rc != FAST_IO_FAIL) {
2435                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2436                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2437         } else
2438                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2439
2440         if (!cancel_rc && !reset_rc)
2441                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2442
2443         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2444                 rc = FAST_IO_FAIL;
2445
2446         LEAVE;
2447         return rc;
2448 }
2449
2450 /**
2451  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2452  * @sdev:       scsi device struct
2453  * @data:       return code
2454  *
2455  **/
2456 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2457 {
2458         unsigned long *rc = data;
2459         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2460 }
2461
2462 /**
2463  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2464  * @sdev:       scsi device struct
2465  * @data:       return code
2466  *
2467  **/
2468 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2469 {
2470         unsigned long *rc = data;
2471         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2472 }
2473
2474 /**
2475  * ibmvfc_eh_target_reset_handler - Reset the target
2476  * @cmd:        scsi command struct
2477  *
2478  * Returns:
2479  *      SUCCESS / FAST_IO_FAIL / FAILED
2480  **/
2481 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2482 {
2483         struct scsi_device *sdev = cmd->device;
2484         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2485         struct scsi_target *starget = scsi_target(sdev);
2486         int block_rc;
2487         int reset_rc = 0;
2488         int rc = FAILED;
2489         unsigned long cancel_rc = 0;
2490
2491         ENTER;
2492         block_rc = fc_block_scsi_eh(cmd);
2493         ibmvfc_wait_while_resetting(vhost);
2494         if (block_rc != FAST_IO_FAIL) {
2495                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2496                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2497         } else
2498                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2499
2500         if (!cancel_rc && !reset_rc)
2501                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2502
2503         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2504                 rc = FAST_IO_FAIL;
2505
2506         LEAVE;
2507         return rc;
2508 }
2509
2510 /**
2511  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2512  * @cmd:        struct scsi_cmnd having problems
2513  *
2514  **/
2515 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2516 {
2517         int rc;
2518         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2519
2520         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2521         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2522
2523         return rc ? FAILED : SUCCESS;
2524 }
2525
2526 /**
2527  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2528  * @rport:              rport struct
2529  *
2530  * Return value:
2531  *      none
2532  **/
2533 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2534 {
2535         struct Scsi_Host *shost = rport_to_shost(rport);
2536         struct ibmvfc_host *vhost = shost_priv(shost);
2537         struct fc_rport *dev_rport;
2538         struct scsi_device *sdev;
2539         unsigned long rc;
2540
2541         ENTER;
2542         shost_for_each_device(sdev, shost) {
2543                 dev_rport = starget_to_rport(scsi_target(sdev));
2544                 if (dev_rport != rport)
2545                         continue;
2546                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2547         }
2548
2549         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2550
2551         if (rc == FAILED)
2552                 ibmvfc_issue_fc_host_lip(shost);
2553         LEAVE;
2554 }
2555
2556 static const struct ibmvfc_async_desc ae_desc [] = {
2557         { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2558         { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2559         { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2560         { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2561         { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2562         { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
2563         { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
2564         { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
2565         { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
2566         { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
2567         { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
2568         { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
2569         { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2570 };
2571
2572 static const struct ibmvfc_async_desc unknown_ae = {
2573         "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2574 };
2575
2576 /**
2577  * ibmvfc_get_ae_desc - Get text description for async event
2578  * @ae: async event
2579  *
2580  **/
2581 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2582 {
2583         int i;
2584
2585         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2586                 if (ae_desc[i].ae == ae)
2587                         return &ae_desc[i];
2588
2589         return &unknown_ae;
2590 }
2591
2592 static const struct {
2593         enum ibmvfc_ae_link_state state;
2594         const char *desc;
2595 } link_desc [] = {
2596         { IBMVFC_AE_LS_LINK_UP,         " link up" },
2597         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
2598         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
2599         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
2600 };
2601
2602 /**
2603  * ibmvfc_get_link_state - Get text description for link state
2604  * @state:      link state
2605  *
2606  **/
2607 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2608 {
2609         int i;
2610
2611         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2612                 if (link_desc[i].state == state)
2613                         return link_desc[i].desc;
2614
2615         return "";
2616 }
2617
2618 /**
2619  * ibmvfc_handle_async - Handle an async event from the adapter
2620  * @crq:        crq to process
2621  * @vhost:      ibmvfc host struct
2622  *
2623  **/
2624 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2625                                 struct ibmvfc_host *vhost)
2626 {
2627         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
2628         struct ibmvfc_target *tgt;
2629
2630         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2631                    " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
2632                    be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
2633                    ibmvfc_get_link_state(crq->link_state));
2634
2635         switch (be64_to_cpu(crq->event)) {
2636         case IBMVFC_AE_RESUME:
2637                 switch (crq->link_state) {
2638                 case IBMVFC_AE_LS_LINK_DOWN:
2639                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2640                         break;
2641                 case IBMVFC_AE_LS_LINK_DEAD:
2642                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2643                         break;
2644                 case IBMVFC_AE_LS_LINK_UP:
2645                 case IBMVFC_AE_LS_LINK_BOUNCED:
2646                 default:
2647                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2648                         vhost->delay_init = 1;
2649                         __ibmvfc_reset_host(vhost);
2650                         break;
2651                 }
2652
2653                 break;
2654         case IBMVFC_AE_LINK_UP:
2655                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2656                 vhost->delay_init = 1;
2657                 __ibmvfc_reset_host(vhost);
2658                 break;
2659         case IBMVFC_AE_SCN_FABRIC:
2660         case IBMVFC_AE_SCN_DOMAIN:
2661                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2662                 if (vhost->state < IBMVFC_HALTED) {
2663                         vhost->delay_init = 1;
2664                         __ibmvfc_reset_host(vhost);
2665                 }
2666                 break;
2667         case IBMVFC_AE_SCN_NPORT:
2668         case IBMVFC_AE_SCN_GROUP:
2669                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2670                 ibmvfc_reinit_host(vhost);
2671                 break;
2672         case IBMVFC_AE_ELS_LOGO:
2673         case IBMVFC_AE_ELS_PRLO:
2674         case IBMVFC_AE_ELS_PLOGI:
2675                 list_for_each_entry(tgt, &vhost->targets, queue) {
2676                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2677                                 break;
2678                         if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
2679                                 continue;
2680                         if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
2681                                 continue;
2682                         if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
2683                                 continue;
2684                         if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
2685                                 tgt->logo_rcvd = 1;
2686                         if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
2687                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2688                                 ibmvfc_reinit_host(vhost);
2689                         }
2690                 }
2691                 break;
2692         case IBMVFC_AE_LINK_DOWN:
2693         case IBMVFC_AE_ADAPTER_FAILED:
2694                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2695                 break;
2696         case IBMVFC_AE_LINK_DEAD:
2697                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2698                 break;
2699         case IBMVFC_AE_HALT:
2700                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2701                 break;
2702         default:
2703                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2704                 break;
2705         }
2706 }
2707
2708 /**
2709  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2710  * @crq:        Command/Response queue
2711  * @vhost:      ibmvfc host struct
2712  *
2713  **/
2714 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2715 {
2716         long rc;
2717         struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
2718
2719         switch (crq->valid) {
2720         case IBMVFC_CRQ_INIT_RSP:
2721                 switch (crq->format) {
2722                 case IBMVFC_CRQ_INIT:
2723                         dev_info(vhost->dev, "Partner initialized\n");
2724                         /* Send back a response */
2725                         rc = ibmvfc_send_crq_init_complete(vhost);
2726                         if (rc == 0)
2727                                 ibmvfc_init_host(vhost);
2728                         else
2729                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2730                         break;
2731                 case IBMVFC_CRQ_INIT_COMPLETE:
2732                         dev_info(vhost->dev, "Partner initialization complete\n");
2733                         ibmvfc_init_host(vhost);
2734                         break;
2735                 default:
2736                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2737                 }
2738                 return;
2739         case IBMVFC_CRQ_XPORT_EVENT:
2740                 vhost->state = IBMVFC_NO_CRQ;
2741                 vhost->logged_in = 0;
2742                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2743                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2744                         /* We need to re-setup the interpartition connection */
2745                         dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
2746                         vhost->client_migrated = 1;
2747                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2748                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2749                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2750                 } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
2751                         dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
2752                         ibmvfc_purge_requests(vhost, DID_ERROR);
2753                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2754                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2755                 } else {
2756                         dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
2757                 }
2758                 return;
2759         case IBMVFC_CRQ_CMD_RSP:
2760                 break;
2761         default:
2762                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2763                 return;
2764         }
2765
2766         if (crq->format == IBMVFC_ASYNC_EVENT)
2767                 return;
2768
2769         /* The only kind of payload CRQs we should get are responses to
2770          * things we send. Make sure this response is to something we
2771          * actually sent
2772          */
2773         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2774                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2775                         crq->ioba);
2776                 return;
2777         }
2778
2779         if (unlikely(atomic_read(&evt->free))) {
2780                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2781                         crq->ioba);
2782                 return;
2783         }
2784
2785         del_timer(&evt->timer);
2786         list_del(&evt->queue);
2787         ibmvfc_trc_end(evt);
2788         evt->done(evt);
2789 }
2790
2791 /**
2792  * ibmvfc_scan_finished - Check if the device scan is done.
2793  * @shost:      scsi host struct
2794  * @time:       current elapsed time
2795  *
2796  * Returns:
2797  *      0 if scan is not done / 1 if scan is done
2798  **/
2799 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2800 {
2801         unsigned long flags;
2802         struct ibmvfc_host *vhost = shost_priv(shost);
2803         int done = 0;
2804
2805         spin_lock_irqsave(shost->host_lock, flags);
2806         if (time >= (init_timeout * HZ)) {
2807                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2808                          "continuing initialization\n", init_timeout);
2809                 done = 1;
2810         }
2811
2812         if (vhost->scan_complete)
2813                 done = 1;
2814         spin_unlock_irqrestore(shost->host_lock, flags);
2815         return done;
2816 }
2817
2818 /**
2819  * ibmvfc_slave_alloc - Setup the device's task set value
2820  * @sdev:       struct scsi_device device to configure
2821  *
2822  * Set the device's task set value so that error handling works as
2823  * expected.
2824  *
2825  * Returns:
2826  *      0 on success / -ENXIO if device does not exist
2827  **/
2828 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2829 {
2830         struct Scsi_Host *shost = sdev->host;
2831         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2832         struct ibmvfc_host *vhost = shost_priv(shost);
2833         unsigned long flags = 0;
2834
2835         if (!rport || fc_remote_port_chkready(rport))
2836                 return -ENXIO;
2837
2838         spin_lock_irqsave(shost->host_lock, flags);
2839         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2840         spin_unlock_irqrestore(shost->host_lock, flags);
2841         return 0;
2842 }
2843
2844 /**
2845  * ibmvfc_target_alloc - Setup the target's task set value
2846  * @starget:    struct scsi_target
2847  *
2848  * Set the target's task set value so that error handling works as
2849  * expected.
2850  *
2851  * Returns:
2852  *      0 on success / -ENXIO if device does not exist
2853  **/
2854 static int ibmvfc_target_alloc(struct scsi_target *starget)
2855 {
2856         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2857         struct ibmvfc_host *vhost = shost_priv(shost);
2858         unsigned long flags = 0;
2859
2860         spin_lock_irqsave(shost->host_lock, flags);
2861         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2862         spin_unlock_irqrestore(shost->host_lock, flags);
2863         return 0;
2864 }
2865
2866 /**
2867  * ibmvfc_slave_configure - Configure the device
2868  * @sdev:       struct scsi_device device to configure
2869  *
2870  * Enable allow_restart for a device if it is a disk. Adjust the
2871  * queue_depth here also.
2872  *
2873  * Returns:
2874  *      0
2875  **/
2876 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2877 {
2878         struct Scsi_Host *shost = sdev->host;
2879         unsigned long flags = 0;
2880
2881         spin_lock_irqsave(shost->host_lock, flags);
2882         if (sdev->type == TYPE_DISK)
2883                 sdev->allow_restart = 1;
2884         spin_unlock_irqrestore(shost->host_lock, flags);
2885         return 0;
2886 }
2887
2888 /**
2889  * ibmvfc_change_queue_depth - Change the device's queue depth
2890  * @sdev:       scsi device struct
2891  * @qdepth:     depth to set
2892  * @reason:     calling context
2893  *
2894  * Return value:
2895  *      actual depth set
2896  **/
2897 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2898 {
2899         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2900                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2901
2902         return scsi_change_queue_depth(sdev, qdepth);
2903 }
2904
2905 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2906                                                  struct device_attribute *attr, char *buf)
2907 {
2908         struct Scsi_Host *shost = class_to_shost(dev);
2909         struct ibmvfc_host *vhost = shost_priv(shost);
2910
2911         return snprintf(buf, PAGE_SIZE, "%s\n",
2912                         vhost->login_buf->resp.partition_name);
2913 }
2914
2915 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2916                                             struct device_attribute *attr, char *buf)
2917 {
2918         struct Scsi_Host *shost = class_to_shost(dev);
2919         struct ibmvfc_host *vhost = shost_priv(shost);
2920
2921         return snprintf(buf, PAGE_SIZE, "%s\n",
2922                         vhost->login_buf->resp.device_name);
2923 }
2924
2925 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2926                                          struct device_attribute *attr, char *buf)
2927 {
2928         struct Scsi_Host *shost = class_to_shost(dev);
2929         struct ibmvfc_host *vhost = shost_priv(shost);
2930
2931         return snprintf(buf, PAGE_SIZE, "%s\n",
2932                         vhost->login_buf->resp.port_loc_code);
2933 }
2934
2935 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2936                                          struct device_attribute *attr, char *buf)
2937 {
2938         struct Scsi_Host *shost = class_to_shost(dev);
2939         struct ibmvfc_host *vhost = shost_priv(shost);
2940
2941         return snprintf(buf, PAGE_SIZE, "%s\n",
2942                         vhost->login_buf->resp.drc_name);
2943 }
2944
2945 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2946                                              struct device_attribute *attr, char *buf)
2947 {
2948         struct Scsi_Host *shost = class_to_shost(dev);
2949         struct ibmvfc_host *vhost = shost_priv(shost);
2950         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2951 }
2952
2953 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2954                                              struct device_attribute *attr, char *buf)
2955 {
2956         struct Scsi_Host *shost = class_to_shost(dev);
2957         struct ibmvfc_host *vhost = shost_priv(shost);
2958         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2959 }
2960
2961 /**
2962  * ibmvfc_show_log_level - Show the adapter's error logging level
2963  * @dev:        class device struct
2964  * @buf:        buffer
2965  *
2966  * Return value:
2967  *      number of bytes printed to buffer
2968  **/
2969 static ssize_t ibmvfc_show_log_level(struct device *dev,
2970                                      struct device_attribute *attr, char *buf)
2971 {
2972         struct Scsi_Host *shost = class_to_shost(dev);
2973         struct ibmvfc_host *vhost = shost_priv(shost);
2974         unsigned long flags = 0;
2975         int len;
2976
2977         spin_lock_irqsave(shost->host_lock, flags);
2978         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2979         spin_unlock_irqrestore(shost->host_lock, flags);
2980         return len;
2981 }
2982
2983 /**
2984  * ibmvfc_store_log_level - Change the adapter's error logging level
2985  * @dev:        class device struct
2986  * @buf:        buffer
2987  *
2988  * Return value:
2989  *      number of bytes printed to buffer
2990  **/
2991 static ssize_t ibmvfc_store_log_level(struct device *dev,
2992                                       struct device_attribute *attr,
2993                                       const char *buf, size_t count)
2994 {
2995         struct Scsi_Host *shost = class_to_shost(dev);
2996         struct ibmvfc_host *vhost = shost_priv(shost);
2997         unsigned long flags = 0;
2998
2999         spin_lock_irqsave(shost->host_lock, flags);
3000         vhost->log_level = simple_strtoul(buf, NULL, 10);
3001         spin_unlock_irqrestore(shost->host_lock, flags);
3002         return strlen(buf);
3003 }
3004
3005 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3006 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3007 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3008 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3009 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3010 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3011 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3012                    ibmvfc_show_log_level, ibmvfc_store_log_level);
3013
3014 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3015 /**
3016  * ibmvfc_read_trace - Dump the adapter trace
3017  * @filp:               open sysfs file
3018  * @kobj:               kobject struct
3019  * @bin_attr:   bin_attribute struct
3020  * @buf:                buffer
3021  * @off:                offset
3022  * @count:              buffer size
3023  *
3024  * Return value:
3025  *      number of bytes printed to buffer
3026  **/
3027 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3028                                  struct bin_attribute *bin_attr,
3029                                  char *buf, loff_t off, size_t count)
3030 {
3031         struct device *dev = container_of(kobj, struct device, kobj);
3032         struct Scsi_Host *shost = class_to_shost(dev);
3033         struct ibmvfc_host *vhost = shost_priv(shost);
3034         unsigned long flags = 0;
3035         int size = IBMVFC_TRACE_SIZE;
3036         char *src = (char *)vhost->trace;
3037
3038         if (off > size)
3039                 return 0;
3040         if (off + count > size) {
3041                 size -= off;
3042                 count = size;
3043         }
3044
3045         spin_lock_irqsave(shost->host_lock, flags);
3046         memcpy(buf, &src[off], count);
3047         spin_unlock_irqrestore(shost->host_lock, flags);
3048         return count;
3049 }
3050
3051 static struct bin_attribute ibmvfc_trace_attr = {
3052         .attr = {
3053                 .name = "trace",
3054                 .mode = S_IRUGO,
3055         },
3056         .size = 0,
3057         .read = ibmvfc_read_trace,
3058 };
3059 #endif
3060
3061 static struct device_attribute *ibmvfc_attrs[] = {
3062         &dev_attr_partition_name,
3063         &dev_attr_device_name,
3064         &dev_attr_port_loc_code,
3065         &dev_attr_drc_name,
3066         &dev_attr_npiv_version,
3067         &dev_attr_capabilities,
3068         &dev_attr_log_level,
3069         NULL
3070 };
3071
3072 static struct scsi_host_template driver_template = {
3073         .module = THIS_MODULE,
3074         .name = "IBM POWER Virtual FC Adapter",
3075         .proc_name = IBMVFC_NAME,
3076         .queuecommand = ibmvfc_queuecommand,
3077         .eh_timed_out = fc_eh_timed_out,
3078         .eh_abort_handler = ibmvfc_eh_abort_handler,
3079         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3080         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3081         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3082         .slave_alloc = ibmvfc_slave_alloc,
3083         .slave_configure = ibmvfc_slave_configure,
3084         .target_alloc = ibmvfc_target_alloc,
3085         .scan_finished = ibmvfc_scan_finished,
3086         .change_queue_depth = ibmvfc_change_queue_depth,
3087         .cmd_per_lun = 16,
3088         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3089         .this_id = -1,
3090         .sg_tablesize = SG_ALL,
3091         .max_sectors = IBMVFC_MAX_SECTORS,
3092         .shost_attrs = ibmvfc_attrs,
3093         .track_queue_depth = 1,
3094 };
3095
3096 /**
3097  * ibmvfc_next_async_crq - Returns the next entry in async queue
3098  * @vhost:      ibmvfc host struct
3099  *
3100  * Returns:
3101  *      Pointer to next entry in queue / NULL if empty
3102  **/
3103 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3104 {
3105         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3106         struct ibmvfc_async_crq *crq;
3107
3108         crq = &async_crq->msgs[async_crq->cur];
3109         if (crq->valid & 0x80) {
3110                 if (++async_crq->cur == async_crq->size)
3111                         async_crq->cur = 0;
3112                 rmb();
3113         } else
3114                 crq = NULL;
3115
3116         return crq;
3117 }
3118
3119 /**
3120  * ibmvfc_next_crq - Returns the next entry in message queue
3121  * @vhost:      ibmvfc host struct
3122  *
3123  * Returns:
3124  *      Pointer to next entry in queue / NULL if empty
3125  **/
3126 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3127 {
3128         struct ibmvfc_crq_queue *queue = &vhost->crq;
3129         struct ibmvfc_crq *crq;
3130
3131         crq = &queue->msgs[queue->cur];
3132         if (crq->valid & 0x80) {
3133                 if (++queue->cur == queue->size)
3134                         queue->cur = 0;
3135                 rmb();
3136         } else
3137                 crq = NULL;
3138
3139         return crq;
3140 }
3141
3142 /**
3143  * ibmvfc_interrupt - Interrupt handler
3144  * @irq:                number of irq to handle, not used
3145  * @dev_instance: ibmvfc_host that received interrupt
3146  *
3147  * Returns:
3148  *      IRQ_HANDLED
3149  **/
3150 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3151 {
3152         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3153         unsigned long flags;
3154
3155         spin_lock_irqsave(vhost->host->host_lock, flags);
3156         vio_disable_interrupts(to_vio_dev(vhost->dev));
3157         tasklet_schedule(&vhost->tasklet);
3158         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3159         return IRQ_HANDLED;
3160 }
3161
3162 /**
3163  * ibmvfc_tasklet - Interrupt handler tasklet
3164  * @data:               ibmvfc host struct
3165  *
3166  * Returns:
3167  *      Nothing
3168  **/
3169 static void ibmvfc_tasklet(void *data)
3170 {
3171         struct ibmvfc_host *vhost = data;
3172         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3173         struct ibmvfc_crq *crq;
3174         struct ibmvfc_async_crq *async;
3175         unsigned long flags;
3176         int done = 0;
3177
3178         spin_lock_irqsave(vhost->host->host_lock, flags);
3179         while (!done) {
3180                 /* Pull all the valid messages off the async CRQ */
3181                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3182                         ibmvfc_handle_async(async, vhost);
3183                         async->valid = 0;
3184                         wmb();
3185                 }
3186
3187                 /* Pull all the valid messages off the CRQ */
3188                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3189                         ibmvfc_handle_crq(crq, vhost);
3190                         crq->valid = 0;
3191                         wmb();
3192                 }
3193
3194                 vio_enable_interrupts(vdev);
3195                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3196                         vio_disable_interrupts(vdev);
3197                         ibmvfc_handle_async(async, vhost);
3198                         async->valid = 0;
3199                         wmb();
3200                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3201                         vio_disable_interrupts(vdev);
3202                         ibmvfc_handle_crq(crq, vhost);
3203                         crq->valid = 0;
3204                         wmb();
3205                 } else
3206                         done = 1;
3207         }
3208
3209         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3210 }
3211
3212 /**
3213  * ibmvfc_init_tgt - Set the next init job step for the target
3214  * @tgt:                ibmvfc target struct
3215  * @job_step:   job step to perform
3216  *
3217  **/
3218 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3219                             void (*job_step) (struct ibmvfc_target *))
3220 {
3221         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3222         tgt->job_step = job_step;
3223         wake_up(&tgt->vhost->work_wait_q);
3224 }
3225
3226 /**
3227  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3228  * @tgt:                ibmvfc target struct
3229  * @job_step:   initialization job step
3230  *
3231  * Returns: 1 if step will be retried / 0 if not
3232  *
3233  **/
3234 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3235                                   void (*job_step) (struct ibmvfc_target *))
3236 {
3237         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3238                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3239                 wake_up(&tgt->vhost->work_wait_q);
3240                 return 0;
3241         } else
3242                 ibmvfc_init_tgt(tgt, job_step);
3243         return 1;
3244 }
3245
3246 /* Defined in FC-LS */
3247 static const struct {
3248         int code;
3249         int retry;
3250         int logged_in;
3251 } prli_rsp [] = {
3252         { 0, 1, 0 },
3253         { 1, 0, 1 },
3254         { 2, 1, 0 },
3255         { 3, 1, 0 },
3256         { 4, 0, 0 },
3257         { 5, 0, 0 },
3258         { 6, 0, 1 },
3259         { 7, 0, 0 },
3260         { 8, 1, 0 },
3261 };
3262
3263 /**
3264  * ibmvfc_get_prli_rsp - Find PRLI response index
3265  * @flags:      PRLI response flags
3266  *
3267  **/
3268 static int ibmvfc_get_prli_rsp(u16 flags)
3269 {
3270         int i;
3271         int code = (flags & 0x0f00) >> 8;
3272
3273         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3274                 if (prli_rsp[i].code == code)
3275                         return i;
3276
3277         return 0;
3278 }
3279
3280 /**
3281  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3282  * @evt:        ibmvfc event struct
3283  *
3284  **/
3285 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3286 {
3287         struct ibmvfc_target *tgt = evt->tgt;
3288         struct ibmvfc_host *vhost = evt->vhost;
3289         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3290         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3291         u32 status = be16_to_cpu(rsp->common.status);
3292         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3293
3294         vhost->discovery_threads--;
3295         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3296         switch (status) {
3297         case IBMVFC_MAD_SUCCESS:
3298                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3299                         parms->type, parms->flags, parms->service_parms);
3300
3301                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3302                         index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3303                         if (prli_rsp[index].logged_in) {
3304                                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3305                                         tgt->need_login = 0;
3306                                         tgt->ids.roles = 0;
3307                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3308                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3309                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3310                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3311                                         tgt->add_rport = 1;
3312                                 } else
3313                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3314                         } else if (prli_rsp[index].retry)
3315                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3316                         else
3317                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3318                 } else
3319                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3320                 break;
3321         case IBMVFC_MAD_DRIVER_FAILED:
3322                 break;
3323         case IBMVFC_MAD_CRQ_ERROR:
3324                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3325                 break;
3326         case IBMVFC_MAD_FAILED:
3327         default:
3328                 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3329                      be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3330                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3331                 else if (tgt->logo_rcvd)
3332                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3333                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3334                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3335                 else
3336                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3337
3338                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3339                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3340                         be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
3341                 break;
3342         }
3343
3344         kref_put(&tgt->kref, ibmvfc_release_tgt);
3345         ibmvfc_free_event(evt);
3346         wake_up(&vhost->work_wait_q);
3347 }
3348
3349 /**
3350  * ibmvfc_tgt_send_prli - Send a process login
3351  * @tgt:        ibmvfc target struct
3352  *
3353  **/
3354 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3355 {
3356         struct ibmvfc_process_login *prli;
3357         struct ibmvfc_host *vhost = tgt->vhost;
3358         struct ibmvfc_event *evt;
3359
3360         if (vhost->discovery_threads >= disc_threads)
3361                 return;
3362
3363         kref_get(&tgt->kref);
3364         evt = ibmvfc_get_event(vhost);
3365         vhost->discovery_threads++;
3366         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3367         evt->tgt = tgt;
3368         prli = &evt->iu.prli;
3369         memset(prli, 0, sizeof(*prli));
3370         prli->common.version = cpu_to_be32(1);
3371         prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
3372         prli->common.length = cpu_to_be16(sizeof(*prli));
3373         prli->scsi_id = cpu_to_be64(tgt->scsi_id);
3374
3375         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3376         prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
3377         prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
3378         prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
3379
3380         if (cls3_error)
3381                 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
3382
3383         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3384         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3385                 vhost->discovery_threads--;
3386                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3387                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3388         } else
3389                 tgt_dbg(tgt, "Sent process login\n");
3390 }
3391
3392 /**
3393  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3394  * @evt:        ibmvfc event struct
3395  *
3396  **/
3397 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3398 {
3399         struct ibmvfc_target *tgt = evt->tgt;
3400         struct ibmvfc_host *vhost = evt->vhost;
3401         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3402         u32 status = be16_to_cpu(rsp->common.status);
3403         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3404
3405         vhost->discovery_threads--;
3406         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3407         switch (status) {
3408         case IBMVFC_MAD_SUCCESS:
3409                 tgt_dbg(tgt, "Port Login succeeded\n");
3410                 if (tgt->ids.port_name &&
3411                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3412                         vhost->reinit = 1;
3413                         tgt_dbg(tgt, "Port re-init required\n");
3414                         break;
3415                 }
3416                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3417                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3418                 tgt->ids.port_id = tgt->scsi_id;
3419                 memcpy(&tgt->service_parms, &rsp->service_parms,
3420                        sizeof(tgt->service_parms));
3421                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3422                        sizeof(tgt->service_parms_change));
3423                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3424                 break;
3425         case IBMVFC_MAD_DRIVER_FAILED:
3426                 break;
3427         case IBMVFC_MAD_CRQ_ERROR:
3428                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3429                 break;
3430         case IBMVFC_MAD_FAILED:
3431         default:
3432                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3433                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3434                 else
3435                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3436
3437                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3438                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3439                                              be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
3440                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
3441                         ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
3442                 break;
3443         }
3444
3445         kref_put(&tgt->kref, ibmvfc_release_tgt);
3446         ibmvfc_free_event(evt);
3447         wake_up(&vhost->work_wait_q);
3448 }
3449
3450 /**
3451  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3452  * @tgt:        ibmvfc target struct
3453  *
3454  **/
3455 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3456 {
3457         struct ibmvfc_port_login *plogi;
3458         struct ibmvfc_host *vhost = tgt->vhost;
3459         struct ibmvfc_event *evt;
3460
3461         if (vhost->discovery_threads >= disc_threads)
3462                 return;
3463
3464         kref_get(&tgt->kref);
3465         tgt->logo_rcvd = 0;
3466         evt = ibmvfc_get_event(vhost);
3467         vhost->discovery_threads++;
3468         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3469         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3470         evt->tgt = tgt;
3471         plogi = &evt->iu.plogi;
3472         memset(plogi, 0, sizeof(*plogi));
3473         plogi->common.version = cpu_to_be32(1);
3474         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
3475         plogi->common.length = cpu_to_be16(sizeof(*plogi));
3476         plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
3477
3478         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3479                 vhost->discovery_threads--;
3480                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3481                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3482         } else
3483                 tgt_dbg(tgt, "Sent port login\n");
3484 }
3485
3486 /**
3487  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3488  * @evt:        ibmvfc event struct
3489  *
3490  **/
3491 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3492 {
3493         struct ibmvfc_target *tgt = evt->tgt;
3494         struct ibmvfc_host *vhost = evt->vhost;
3495         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3496         u32 status = be16_to_cpu(rsp->common.status);
3497
3498         vhost->discovery_threads--;
3499         ibmvfc_free_event(evt);
3500         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3501
3502         switch (status) {
3503         case IBMVFC_MAD_SUCCESS:
3504                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3505                 break;
3506         case IBMVFC_MAD_DRIVER_FAILED:
3507                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3508                 wake_up(&vhost->work_wait_q);
3509                 return;
3510         case IBMVFC_MAD_FAILED:
3511         default:
3512                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3513                 break;
3514         }
3515
3516         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3517                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3518         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3519                  tgt->scsi_id != tgt->new_scsi_id)
3520                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3521         kref_put(&tgt->kref, ibmvfc_release_tgt);
3522         wake_up(&vhost->work_wait_q);
3523 }
3524
3525 /**
3526  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3527  * @tgt:                ibmvfc target struct
3528  *
3529  **/
3530 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3531 {
3532         struct ibmvfc_implicit_logout *mad;
3533         struct ibmvfc_host *vhost = tgt->vhost;
3534         struct ibmvfc_event *evt;
3535
3536         if (vhost->discovery_threads >= disc_threads)
3537                 return;
3538
3539         kref_get(&tgt->kref);
3540         evt = ibmvfc_get_event(vhost);
3541         vhost->discovery_threads++;
3542         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3543         evt->tgt = tgt;
3544         mad = &evt->iu.implicit_logout;
3545         memset(mad, 0, sizeof(*mad));
3546         mad->common.version = cpu_to_be32(1);
3547         mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
3548         mad->common.length = cpu_to_be16(sizeof(*mad));
3549         mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
3550
3551         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3552         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3553                 vhost->discovery_threads--;
3554                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3555                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3556         } else
3557                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3558 }
3559
3560 /**
3561  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3562  * @mad:        ibmvfc passthru mad struct
3563  * @tgt:        ibmvfc target struct
3564  *
3565  * Returns:
3566  *      1 if PLOGI needed / 0 if PLOGI not needed
3567  **/
3568 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3569                                     struct ibmvfc_target *tgt)
3570 {
3571         if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
3572                 return 1;
3573         if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
3574                 return 1;
3575         if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
3576                 return 1;
3577         return 0;
3578 }
3579
3580 /**
3581  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3582  * @evt:        ibmvfc event struct
3583  *
3584  **/
3585 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3586 {
3587         struct ibmvfc_target *tgt = evt->tgt;
3588         struct ibmvfc_host *vhost = evt->vhost;
3589         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3590         u32 status = be16_to_cpu(mad->common.status);
3591         u8 fc_reason, fc_explain;
3592
3593         vhost->discovery_threads--;
3594         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3595         del_timer(&tgt->timer);
3596
3597         switch (status) {
3598         case IBMVFC_MAD_SUCCESS:
3599                 tgt_dbg(tgt, "ADISC succeeded\n");
3600                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3601                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3602                 break;
3603         case IBMVFC_MAD_DRIVER_FAILED:
3604                 break;
3605         case IBMVFC_MAD_FAILED:
3606         default:
3607                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3608                 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
3609                 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
3610                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3611                          ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
3612                          be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
3613                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3614                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3615                 break;
3616         }
3617
3618         kref_put(&tgt->kref, ibmvfc_release_tgt);
3619         ibmvfc_free_event(evt);
3620         wake_up(&vhost->work_wait_q);
3621 }
3622
3623 /**
3624  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3625  * @evt:                ibmvfc event struct
3626  *
3627  **/
3628 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3629 {
3630         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3631
3632         memset(mad, 0, sizeof(*mad));
3633         mad->common.version = cpu_to_be32(1);
3634         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
3635         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
3636         mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3637                 offsetof(struct ibmvfc_passthru_mad, iu));
3638         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
3639         mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3640         mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
3641         mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3642                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3643                 offsetof(struct ibmvfc_passthru_fc_iu, payload));
3644         mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3645         mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3646                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3647                 offsetof(struct ibmvfc_passthru_fc_iu, response));
3648         mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
3649 }
3650
3651 /**
3652  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3653  * @evt:                ibmvfc event struct
3654  *
3655  * Just cleanup this event struct. Everything else is handled by
3656  * the ADISC completion handler. If the ADISC never actually comes
3657  * back, we still have the timer running on the ADISC event struct
3658  * which will fire and cause the CRQ to get reset.
3659  *
3660  **/
3661 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3662 {
3663         struct ibmvfc_host *vhost = evt->vhost;
3664         struct ibmvfc_target *tgt = evt->tgt;
3665
3666         tgt_dbg(tgt, "ADISC cancel complete\n");
3667         vhost->abort_threads--;
3668         ibmvfc_free_event(evt);
3669         kref_put(&tgt->kref, ibmvfc_release_tgt);
3670         wake_up(&vhost->work_wait_q);
3671 }
3672
3673 /**
3674  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3675  * @tgt:                ibmvfc target struct
3676  *
3677  * If an ADISC times out, send a cancel. If the cancel times
3678  * out, reset the CRQ. When the ADISC comes back as cancelled,
3679  * log back into the target.
3680  **/
3681 static void ibmvfc_adisc_timeout(struct timer_list *t)
3682 {
3683         struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
3684         struct ibmvfc_host *vhost = tgt->vhost;
3685         struct ibmvfc_event *evt;
3686         struct ibmvfc_tmf *tmf;
3687         unsigned long flags;
3688         int rc;
3689
3690         tgt_dbg(tgt, "ADISC timeout\n");
3691         spin_lock_irqsave(vhost->host->host_lock, flags);
3692         if (vhost->abort_threads >= disc_threads ||
3693             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3694             vhost->state != IBMVFC_INITIALIZING ||
3695             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3696                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3697                 return;
3698         }
3699
3700         vhost->abort_threads++;
3701         kref_get(&tgt->kref);
3702         evt = ibmvfc_get_event(vhost);
3703         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3704
3705         evt->tgt = tgt;
3706         tmf = &evt->iu.tmf;
3707         memset(tmf, 0, sizeof(*tmf));
3708         tmf->common.version = cpu_to_be32(1);
3709         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
3710         tmf->common.length = cpu_to_be16(sizeof(*tmf));
3711         tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
3712         tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
3713
3714         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3715
3716         if (rc) {
3717                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3718                 vhost->abort_threads--;
3719                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3720                 __ibmvfc_reset_host(vhost);
3721         } else
3722                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3723         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3724 }
3725
3726 /**
3727  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3728  * @tgt:                ibmvfc target struct
3729  *
3730  * When sending an ADISC we end up with two timers running. The
3731  * first timer is the timer in the ibmvfc target struct. If this
3732  * fires, we send a cancel to the target. The second timer is the
3733  * timer on the ibmvfc event for the ADISC, which is longer. If that
3734  * fires, it means the ADISC timed out and our attempt to cancel it
3735  * also failed, so we need to reset the CRQ.
3736  **/
3737 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3738 {
3739         struct ibmvfc_passthru_mad *mad;
3740         struct ibmvfc_host *vhost = tgt->vhost;
3741         struct ibmvfc_event *evt;
3742
3743         if (vhost->discovery_threads >= disc_threads)
3744                 return;
3745
3746         kref_get(&tgt->kref);
3747         evt = ibmvfc_get_event(vhost);
3748         vhost->discovery_threads++;
3749         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3750         evt->tgt = tgt;
3751
3752         ibmvfc_init_passthru(evt);
3753         mad = &evt->iu.passthru;
3754         mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
3755         mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
3756         mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
3757
3758         mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
3759         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3760                sizeof(vhost->login_buf->resp.port_name));
3761         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3762                sizeof(vhost->login_buf->resp.node_name));
3763         mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
3764
3765         if (timer_pending(&tgt->timer))
3766                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3767         else {
3768                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3769                 add_timer(&tgt->timer);
3770         }
3771
3772         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3773         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3774                 vhost->discovery_threads--;
3775                 del_timer(&tgt->timer);
3776                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3777                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3778         } else
3779                 tgt_dbg(tgt, "Sent ADISC\n");
3780 }
3781
3782 /**
3783  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3784  * @evt:        ibmvfc event struct
3785  *
3786  **/
3787 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3788 {
3789         struct ibmvfc_target *tgt = evt->tgt;
3790         struct ibmvfc_host *vhost = evt->vhost;
3791         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3792         u32 status = be16_to_cpu(rsp->common.status);
3793         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3794
3795         vhost->discovery_threads--;
3796         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3797         switch (status) {
3798         case IBMVFC_MAD_SUCCESS:
3799                 tgt_dbg(tgt, "Query Target succeeded\n");
3800                 tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
3801                 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
3802                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3803                 else
3804                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3805                 break;
3806         case IBMVFC_MAD_DRIVER_FAILED:
3807                 break;
3808         case IBMVFC_MAD_CRQ_ERROR:
3809                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3810                 break;
3811         case IBMVFC_MAD_FAILED:
3812         default:
3813                 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3814                     be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3815                     be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
3816                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3817                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3818                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3819                 else
3820                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3821
3822                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3823                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3824                         be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
3825                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
3826                         ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
3827                         status);
3828                 break;
3829         }
3830
3831         kref_put(&tgt->kref, ibmvfc_release_tgt);
3832         ibmvfc_free_event(evt);
3833         wake_up(&vhost->work_wait_q);
3834 }
3835
3836 /**
3837  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3838  * @tgt:        ibmvfc target struct
3839  *
3840  **/
3841 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3842 {
3843         struct ibmvfc_query_tgt *query_tgt;
3844         struct ibmvfc_host *vhost = tgt->vhost;
3845         struct ibmvfc_event *evt;
3846
3847         if (vhost->discovery_threads >= disc_threads)
3848                 return;
3849
3850         kref_get(&tgt->kref);
3851         evt = ibmvfc_get_event(vhost);
3852         vhost->discovery_threads++;
3853         evt->tgt = tgt;
3854         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3855         query_tgt = &evt->iu.query_tgt;
3856         memset(query_tgt, 0, sizeof(*query_tgt));
3857         query_tgt->common.version = cpu_to_be32(1);
3858         query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
3859         query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
3860         query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
3861
3862         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3863         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3864                 vhost->discovery_threads--;
3865                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3866                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3867         } else
3868                 tgt_dbg(tgt, "Sent Query Target\n");
3869 }
3870
3871 /**
3872  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3873  * @vhost:              ibmvfc host struct
3874  * @scsi_id:    SCSI ID to allocate target for
3875  *
3876  * Returns:
3877  *      0 on success / other on failure
3878  **/
3879 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3880 {
3881         struct ibmvfc_target *tgt;
3882         unsigned long flags;
3883
3884         spin_lock_irqsave(vhost->host->host_lock, flags);
3885         list_for_each_entry(tgt, &vhost->targets, queue) {
3886                 if (tgt->scsi_id == scsi_id) {
3887                         if (tgt->need_login)
3888                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3889                         goto unlock_out;
3890                 }
3891         }
3892         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3893
3894         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3895         memset(tgt, 0, sizeof(*tgt));
3896         tgt->scsi_id = scsi_id;
3897         tgt->new_scsi_id = scsi_id;
3898         tgt->vhost = vhost;
3899         tgt->need_login = 1;
3900         tgt->cancel_key = vhost->task_set++;
3901         timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
3902         kref_init(&tgt->kref);
3903         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3904         spin_lock_irqsave(vhost->host->host_lock, flags);
3905         list_add_tail(&tgt->queue, &vhost->targets);
3906
3907 unlock_out:
3908         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3909         return 0;
3910 }
3911
3912 /**
3913  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3914  * @vhost:              ibmvfc host struct
3915  *
3916  * Returns:
3917  *      0 on success / other on failure
3918  **/
3919 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3920 {
3921         int i, rc;
3922
3923         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3924                 rc = ibmvfc_alloc_target(vhost,
3925                                          be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
3926                                          IBMVFC_DISC_TGT_SCSI_ID_MASK);
3927
3928         return rc;
3929 }
3930
3931 /**
3932  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3933  * @evt:        ibmvfc event struct
3934  *
3935  **/
3936 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3937 {
3938         struct ibmvfc_host *vhost = evt->vhost;
3939         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3940         u32 mad_status = be16_to_cpu(rsp->common.status);
3941         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3942
3943         switch (mad_status) {
3944         case IBMVFC_MAD_SUCCESS:
3945                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3946                 vhost->num_targets = be32_to_cpu(rsp->num_written);
3947                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3948                 break;
3949         case IBMVFC_MAD_FAILED:
3950                 level += ibmvfc_retry_host_init(vhost);
3951                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3952                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3953                            be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
3954                 break;
3955         case IBMVFC_MAD_DRIVER_FAILED:
3956                 break;
3957         default:
3958                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3959                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3960                 break;
3961         }
3962
3963         ibmvfc_free_event(evt);
3964         wake_up(&vhost->work_wait_q);
3965 }
3966
3967 /**
3968  * ibmvfc_discover_targets - Send Discover Targets MAD
3969  * @vhost:      ibmvfc host struct
3970  *
3971  **/
3972 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3973 {
3974         struct ibmvfc_discover_targets *mad;
3975         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3976
3977         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3978         mad = &evt->iu.discover_targets;
3979         memset(mad, 0, sizeof(*mad));
3980         mad->common.version = cpu_to_be32(1);
3981         mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
3982         mad->common.length = cpu_to_be16(sizeof(*mad));
3983         mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
3984         mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
3985         mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
3986         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3987
3988         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3989                 ibmvfc_dbg(vhost, "Sent discover targets\n");
3990         else
3991                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3992 }
3993
3994 /**
3995  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
3996  * @evt:        ibmvfc event struct
3997  *
3998  **/
3999 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4000 {
4001         struct ibmvfc_host *vhost = evt->vhost;
4002         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
4003         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4004         unsigned int npiv_max_sectors;
4005         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4006
4007         switch (mad_status) {
4008         case IBMVFC_MAD_SUCCESS:
4009                 ibmvfc_free_event(evt);
4010                 break;
4011         case IBMVFC_MAD_FAILED:
4012                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4013                         level += ibmvfc_retry_host_init(vhost);
4014                 else
4015                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4016                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4017                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4018                                                 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4019                 ibmvfc_free_event(evt);
4020                 return;
4021         case IBMVFC_MAD_CRQ_ERROR:
4022                 ibmvfc_retry_host_init(vhost);
4023         case IBMVFC_MAD_DRIVER_FAILED:
4024                 ibmvfc_free_event(evt);
4025                 return;
4026         default:
4027                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4028                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4029                 ibmvfc_free_event(evt);
4030                 return;
4031         }
4032
4033         vhost->client_migrated = 0;
4034
4035         if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
4036                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4037                         rsp->flags);
4038                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4039                 wake_up(&vhost->work_wait_q);
4040                 return;
4041         }
4042
4043         if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
4044                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4045                         rsp->max_cmds);
4046                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4047                 wake_up(&vhost->work_wait_q);
4048                 return;
4049         }
4050
4051         vhost->logged_in = 1;
4052         npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
4053         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4054                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4055                  rsp->drc_name, npiv_max_sectors);
4056
4057         fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
4058         fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
4059         fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
4060         fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
4061         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4062         fc_host_supported_classes(vhost->host) = 0;
4063         if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
4064                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4065         if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
4066                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4067         if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
4068                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4069         fc_host_maxframe_size(vhost->host) =
4070                 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
4071
4072         vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
4073         vhost->host->max_sectors = npiv_max_sectors;
4074         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4075         wake_up(&vhost->work_wait_q);
4076 }
4077
4078 /**
4079  * ibmvfc_npiv_login - Sends NPIV login
4080  * @vhost:      ibmvfc host struct
4081  *
4082  **/
4083 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4084 {
4085         struct ibmvfc_npiv_login_mad *mad;
4086         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4087
4088         ibmvfc_gather_partition_info(vhost);
4089         ibmvfc_set_login_info(vhost);
4090         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4091
4092         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4093         mad = &evt->iu.npiv_login;
4094         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4095         mad->common.version = cpu_to_be32(1);
4096         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
4097         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
4098         mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
4099         mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
4100
4101         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4102
4103         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4104                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4105         else
4106                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4107 };
4108
4109 /**
4110  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4111  * @vhost:              ibmvfc host struct
4112  *
4113  **/
4114 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4115 {
4116         struct ibmvfc_host *vhost = evt->vhost;
4117         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
4118
4119         ibmvfc_free_event(evt);
4120
4121         switch (mad_status) {
4122         case IBMVFC_MAD_SUCCESS:
4123                 if (list_empty(&vhost->sent) &&
4124                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4125                         ibmvfc_init_host(vhost);
4126                         return;
4127                 }
4128                 break;
4129         case IBMVFC_MAD_FAILED:
4130         case IBMVFC_MAD_NOT_SUPPORTED:
4131         case IBMVFC_MAD_CRQ_ERROR:
4132         case IBMVFC_MAD_DRIVER_FAILED:
4133         default:
4134                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4135                 break;
4136         }
4137
4138         ibmvfc_hard_reset_host(vhost);
4139 }
4140
4141 /**
4142  * ibmvfc_npiv_logout - Issue an NPIV Logout
4143  * @vhost:              ibmvfc host struct
4144  *
4145  **/
4146 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4147 {
4148         struct ibmvfc_npiv_logout_mad *mad;
4149         struct ibmvfc_event *evt;
4150
4151         evt = ibmvfc_get_event(vhost);
4152         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4153
4154         mad = &evt->iu.npiv_logout;
4155         memset(mad, 0, sizeof(*mad));
4156         mad->common.version = cpu_to_be32(1);
4157         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
4158         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
4159
4160         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4161
4162         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4163                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4164         else
4165                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4166 }
4167
4168 /**
4169  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4170  * @vhost:              ibmvfc host struct
4171  *
4172  * Returns:
4173  *      1 if work to do / 0 if not
4174  **/
4175 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4176 {
4177         struct ibmvfc_target *tgt;
4178
4179         list_for_each_entry(tgt, &vhost->targets, queue) {
4180                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4181                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4182                         return 1;
4183         }
4184
4185         return 0;
4186 }
4187
4188 /**
4189  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4190  * @vhost:              ibmvfc host struct
4191  *
4192  * Returns:
4193  *      1 if work to do / 0 if not
4194  **/
4195 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4196 {
4197         struct ibmvfc_target *tgt;
4198
4199         if (kthread_should_stop())
4200                 return 1;
4201         switch (vhost->action) {
4202         case IBMVFC_HOST_ACTION_NONE:
4203         case IBMVFC_HOST_ACTION_INIT_WAIT:
4204         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4205                 return 0;
4206         case IBMVFC_HOST_ACTION_TGT_INIT:
4207         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4208                 if (vhost->discovery_threads == disc_threads)
4209                         return 0;
4210                 list_for_each_entry(tgt, &vhost->targets, queue)
4211                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4212                                 return 1;
4213                 list_for_each_entry(tgt, &vhost->targets, queue)
4214                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4215                                 return 0;
4216                 return 1;
4217         case IBMVFC_HOST_ACTION_LOGO:
4218         case IBMVFC_HOST_ACTION_INIT:
4219         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4220         case IBMVFC_HOST_ACTION_TGT_DEL:
4221         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4222         case IBMVFC_HOST_ACTION_QUERY:
4223         case IBMVFC_HOST_ACTION_RESET:
4224         case IBMVFC_HOST_ACTION_REENABLE:
4225         default:
4226                 break;
4227         }
4228
4229         return 1;
4230 }
4231
4232 /**
4233  * ibmvfc_work_to_do - Is there task level work to do?
4234  * @vhost:              ibmvfc host struct
4235  *
4236  * Returns:
4237  *      1 if work to do / 0 if not
4238  **/
4239 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4240 {
4241         unsigned long flags;
4242         int rc;
4243
4244         spin_lock_irqsave(vhost->host->host_lock, flags);
4245         rc = __ibmvfc_work_to_do(vhost);
4246         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4247         return rc;
4248 }
4249
4250 /**
4251  * ibmvfc_log_ae - Log async events if necessary
4252  * @vhost:              ibmvfc host struct
4253  * @events:             events to log
4254  *
4255  **/
4256 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4257 {
4258         if (events & IBMVFC_AE_RSCN)
4259                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4260         if ((events & IBMVFC_AE_LINKDOWN) &&
4261             vhost->state >= IBMVFC_HALTED)
4262                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4263         if ((events & IBMVFC_AE_LINKUP) &&
4264             vhost->state == IBMVFC_INITIALIZING)
4265                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4266 }
4267
4268 /**
4269  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4270  * @tgt:                ibmvfc target struct
4271  *
4272  **/
4273 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4274 {
4275         struct ibmvfc_host *vhost = tgt->vhost;
4276         struct fc_rport *rport;
4277         unsigned long flags;
4278
4279         tgt_dbg(tgt, "Adding rport\n");
4280         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4281         spin_lock_irqsave(vhost->host->host_lock, flags);
4282
4283         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4284                 tgt_dbg(tgt, "Deleting rport\n");
4285                 list_del(&tgt->queue);
4286                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4287                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4288                 fc_remote_port_delete(rport);
4289                 del_timer_sync(&tgt->timer);
4290                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4291                 return;
4292         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4293                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4294                 return;
4295         }
4296
4297         if (rport) {
4298                 tgt_dbg(tgt, "rport add succeeded\n");
4299                 tgt->rport = rport;
4300                 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
4301                 rport->supported_classes = 0;
4302                 tgt->target_id = rport->scsi_target_id;
4303                 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
4304                         rport->supported_classes |= FC_COS_CLASS1;
4305                 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
4306                         rport->supported_classes |= FC_COS_CLASS2;
4307                 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
4308                         rport->supported_classes |= FC_COS_CLASS3;
4309                 if (rport->rqst_q)
4310                         blk_queue_max_segments(rport->rqst_q, 1);
4311         } else
4312                 tgt_dbg(tgt, "rport add failed\n");
4313         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4314 }
4315
4316 /**
4317  * ibmvfc_do_work - Do task level work
4318  * @vhost:              ibmvfc host struct
4319  *
4320  **/
4321 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4322 {
4323         struct ibmvfc_target *tgt;
4324         unsigned long flags;
4325         struct fc_rport *rport;
4326         int rc;
4327
4328         ibmvfc_log_ae(vhost, vhost->events_to_log);
4329         spin_lock_irqsave(vhost->host->host_lock, flags);
4330         vhost->events_to_log = 0;
4331         switch (vhost->action) {
4332         case IBMVFC_HOST_ACTION_NONE:
4333         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4334         case IBMVFC_HOST_ACTION_INIT_WAIT:
4335                 break;
4336         case IBMVFC_HOST_ACTION_RESET:
4337                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4338                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4339                 rc = ibmvfc_reset_crq(vhost);
4340                 spin_lock_irqsave(vhost->host->host_lock, flags);
4341                 if (rc == H_CLOSED)
4342                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4343                 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4344                     (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4345                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4346                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4347                 }
4348                 break;
4349         case IBMVFC_HOST_ACTION_REENABLE:
4350                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4351                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4352                 rc = ibmvfc_reenable_crq_queue(vhost);
4353                 spin_lock_irqsave(vhost->host->host_lock, flags);
4354                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4355                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4356                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4357                 }
4358                 break;
4359         case IBMVFC_HOST_ACTION_LOGO:
4360                 vhost->job_step(vhost);
4361                 break;
4362         case IBMVFC_HOST_ACTION_INIT:
4363                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4364                 if (vhost->delay_init) {
4365                         vhost->delay_init = 0;
4366                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4367                         ssleep(15);
4368                         return;
4369                 } else
4370                         vhost->job_step(vhost);
4371                 break;
4372         case IBMVFC_HOST_ACTION_QUERY:
4373                 list_for_each_entry(tgt, &vhost->targets, queue)
4374                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4375                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4376                 break;
4377         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4378                 list_for_each_entry(tgt, &vhost->targets, queue) {
4379                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4380                                 tgt->job_step(tgt);
4381                                 break;
4382                         }
4383                 }
4384
4385                 if (!ibmvfc_dev_init_to_do(vhost))
4386                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4387                 break;
4388         case IBMVFC_HOST_ACTION_TGT_DEL:
4389         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4390                 list_for_each_entry(tgt, &vhost->targets, queue) {
4391                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4392                                 tgt_dbg(tgt, "Deleting rport\n");
4393                                 rport = tgt->rport;
4394                                 tgt->rport = NULL;
4395                                 list_del(&tgt->queue);
4396                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4397                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4398                                 if (rport)
4399                                         fc_remote_port_delete(rport);
4400                                 del_timer_sync(&tgt->timer);
4401                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4402                                 return;
4403                         }
4404                 }
4405
4406                 if (vhost->state == IBMVFC_INITIALIZING) {
4407                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4408                                 if (vhost->reinit) {
4409                                         vhost->reinit = 0;
4410                                         scsi_block_requests(vhost->host);
4411                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4412                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4413                                 } else {
4414                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4415                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4416                                         wake_up(&vhost->init_wait_q);
4417                                         schedule_work(&vhost->rport_add_work_q);
4418                                         vhost->init_retries = 0;
4419                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4420                                         scsi_unblock_requests(vhost->host);
4421                                 }
4422
4423                                 return;
4424                         } else {
4425                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4426                                 vhost->job_step = ibmvfc_discover_targets;
4427                         }
4428                 } else {
4429                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4430                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4431                         scsi_unblock_requests(vhost->host);
4432                         wake_up(&vhost->init_wait_q);
4433                         return;
4434                 }
4435                 break;
4436         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4437                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4438                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4439                 ibmvfc_alloc_targets(vhost);
4440                 spin_lock_irqsave(vhost->host->host_lock, flags);
4441                 break;
4442         case IBMVFC_HOST_ACTION_TGT_INIT:
4443                 list_for_each_entry(tgt, &vhost->targets, queue) {
4444                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4445                                 tgt->job_step(tgt);
4446                                 break;
4447                         }
4448                 }
4449
4450                 if (!ibmvfc_dev_init_to_do(vhost))
4451                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4452                 break;
4453         default:
4454                 break;
4455         }
4456
4457         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4458 }
4459
4460 /**
4461  * ibmvfc_work - Do task level work
4462  * @data:               ibmvfc host struct
4463  *
4464  * Returns:
4465  *      zero
4466  **/
4467 static int ibmvfc_work(void *data)
4468 {
4469         struct ibmvfc_host *vhost = data;
4470         int rc;
4471
4472         set_user_nice(current, MIN_NICE);
4473
4474         while (1) {
4475                 rc = wait_event_interruptible(vhost->work_wait_q,
4476                                               ibmvfc_work_to_do(vhost));
4477
4478                 BUG_ON(rc);
4479
4480                 if (kthread_should_stop())
4481                         break;
4482
4483                 ibmvfc_do_work(vhost);
4484         }
4485
4486         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4487         return 0;
4488 }
4489
4490 /**
4491  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4492  * @vhost:      ibmvfc host struct
4493  *
4494  * Allocates a page for messages, maps it for dma, and registers
4495  * the crq with the hypervisor.
4496  *
4497  * Return value:
4498  *      zero on success / other on failure
4499  **/
4500 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4501 {
4502         int rc, retrc = -ENOMEM;
4503         struct device *dev = vhost->dev;
4504         struct vio_dev *vdev = to_vio_dev(dev);
4505         struct ibmvfc_crq_queue *crq = &vhost->crq;
4506
4507         ENTER;
4508         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4509
4510         if (!crq->msgs)
4511                 return -ENOMEM;
4512
4513         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4514         crq->msg_token = dma_map_single(dev, crq->msgs,
4515                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4516
4517         if (dma_mapping_error(dev, crq->msg_token))
4518                 goto map_failed;
4519
4520         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4521                                         crq->msg_token, PAGE_SIZE);
4522
4523         if (rc == H_RESOURCE)
4524                 /* maybe kexecing and resource is busy. try a reset */
4525                 retrc = rc = ibmvfc_reset_crq(vhost);
4526
4527         if (rc == H_CLOSED)
4528                 dev_warn(dev, "Partner adapter not ready\n");
4529         else if (rc) {
4530                 dev_warn(dev, "Error %d opening adapter\n", rc);
4531                 goto reg_crq_failed;
4532         }
4533
4534         retrc = 0;
4535
4536         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4537
4538         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4539                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4540                 goto req_irq_failed;
4541         }
4542
4543         if ((rc = vio_enable_interrupts(vdev))) {
4544                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4545                 goto req_irq_failed;
4546         }
4547
4548         crq->cur = 0;
4549         LEAVE;
4550         return retrc;
4551
4552 req_irq_failed:
4553         tasklet_kill(&vhost->tasklet);
4554         do {
4555                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4556         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4557 reg_crq_failed:
4558         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4559 map_failed:
4560         free_page((unsigned long)crq->msgs);
4561         return retrc;
4562 }
4563
4564 /**
4565  * ibmvfc_free_mem - Free memory for vhost
4566  * @vhost:      ibmvfc host struct
4567  *
4568  * Return value:
4569  *      none
4570  **/
4571 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4572 {
4573         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4574
4575         ENTER;
4576         mempool_destroy(vhost->tgt_pool);
4577         kfree(vhost->trace);
4578         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4579                           vhost->disc_buf_dma);
4580         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4581                           vhost->login_buf, vhost->login_buf_dma);
4582         dma_pool_destroy(vhost->sg_pool);
4583         dma_unmap_single(vhost->dev, async_q->msg_token,
4584                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4585         free_page((unsigned long)async_q->msgs);
4586         LEAVE;
4587 }
4588
4589 /**
4590  * ibmvfc_alloc_mem - Allocate memory for vhost
4591  * @vhost:      ibmvfc host struct
4592  *
4593  * Return value:
4594  *      0 on success / non-zero on failure
4595  **/
4596 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4597 {
4598         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4599         struct device *dev = vhost->dev;
4600
4601         ENTER;
4602         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4603         if (!async_q->msgs) {
4604                 dev_err(dev, "Couldn't allocate async queue.\n");
4605                 goto nomem;
4606         }
4607
4608         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4609         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4610                                             async_q->size * sizeof(*async_q->msgs),
4611                                             DMA_BIDIRECTIONAL);
4612
4613         if (dma_mapping_error(dev, async_q->msg_token)) {
4614                 dev_err(dev, "Failed to map async queue\n");
4615                 goto free_async_crq;
4616         }
4617
4618         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4619                                          SG_ALL * sizeof(struct srp_direct_buf),
4620                                          sizeof(struct srp_direct_buf), 0);
4621
4622         if (!vhost->sg_pool) {
4623                 dev_err(dev, "Failed to allocate sg pool\n");
4624                 goto unmap_async_crq;
4625         }
4626
4627         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4628                                               &vhost->login_buf_dma, GFP_KERNEL);
4629
4630         if (!vhost->login_buf) {
4631                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4632                 goto free_sg_pool;
4633         }
4634
4635         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4636         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4637                                              &vhost->disc_buf_dma, GFP_KERNEL);
4638
4639         if (!vhost->disc_buf) {
4640                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4641                 goto free_login_buffer;
4642         }
4643
4644         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4645                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4646
4647         if (!vhost->trace)
4648                 goto free_disc_buffer;
4649
4650         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4651                                                       sizeof(struct ibmvfc_target));
4652
4653         if (!vhost->tgt_pool) {
4654                 dev_err(dev, "Couldn't allocate target memory pool\n");
4655                 goto free_trace;
4656         }
4657
4658         LEAVE;
4659         return 0;
4660
4661 free_trace:
4662         kfree(vhost->trace);
4663 free_disc_buffer:
4664         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4665                           vhost->disc_buf_dma);
4666 free_login_buffer:
4667         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4668                           vhost->login_buf, vhost->login_buf_dma);
4669 free_sg_pool:
4670         dma_pool_destroy(vhost->sg_pool);
4671 unmap_async_crq:
4672         dma_unmap_single(dev, async_q->msg_token,
4673                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4674 free_async_crq:
4675         free_page((unsigned long)async_q->msgs);
4676 nomem:
4677         LEAVE;
4678         return -ENOMEM;
4679 }
4680
4681 /**
4682  * ibmvfc_rport_add_thread - Worker thread for rport adds
4683  * @work:       work struct
4684  *
4685  **/
4686 static void ibmvfc_rport_add_thread(struct work_struct *work)
4687 {
4688         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4689                                                  rport_add_work_q);
4690         struct ibmvfc_target *tgt;
4691         struct fc_rport *rport;
4692         unsigned long flags;
4693         int did_work;
4694
4695         ENTER;
4696         spin_lock_irqsave(vhost->host->host_lock, flags);
4697         do {
4698                 did_work = 0;
4699                 if (vhost->state != IBMVFC_ACTIVE)
4700                         break;
4701
4702                 list_for_each_entry(tgt, &vhost->targets, queue) {
4703                         if (tgt->add_rport) {
4704                                 did_work = 1;
4705                                 tgt->add_rport = 0;
4706                                 kref_get(&tgt->kref);
4707                                 rport = tgt->rport;
4708                                 if (!rport) {
4709                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4710                                         ibmvfc_tgt_add_rport(tgt);
4711                                 } else if (get_device(&rport->dev)) {
4712                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4713                                         tgt_dbg(tgt, "Setting rport roles\n");
4714                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4715                                         put_device(&rport->dev);
4716                                 } else {
4717                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4718                                 }
4719
4720                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4721                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4722                                 break;
4723                         }
4724                 }
4725         } while(did_work);
4726
4727         if (vhost->state == IBMVFC_ACTIVE)
4728                 vhost->scan_complete = 1;
4729         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4730         LEAVE;
4731 }
4732
4733 /**
4734  * ibmvfc_probe - Adapter hot plug add entry point
4735  * @vdev:       vio device struct
4736  * @id: vio device id struct
4737  *
4738  * Return value:
4739  *      0 on success / non-zero on failure
4740  **/
4741 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4742 {
4743         struct ibmvfc_host *vhost;
4744         struct Scsi_Host *shost;
4745         struct device *dev = &vdev->dev;
4746         int rc = -ENOMEM;
4747
4748         ENTER;
4749         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4750         if (!shost) {
4751                 dev_err(dev, "Couldn't allocate host data\n");
4752                 goto out;
4753         }
4754
4755         shost->transportt = ibmvfc_transport_template;
4756         shost->can_queue = max_requests;
4757         shost->max_lun = max_lun;
4758         shost->max_id = max_targets;
4759         shost->max_sectors = IBMVFC_MAX_SECTORS;
4760         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4761         shost->unique_id = shost->host_no;
4762
4763         vhost = shost_priv(shost);
4764         INIT_LIST_HEAD(&vhost->sent);
4765         INIT_LIST_HEAD(&vhost->free);
4766         INIT_LIST_HEAD(&vhost->targets);
4767         sprintf(vhost->name, IBMVFC_NAME);
4768         vhost->host = shost;
4769         vhost->dev = dev;
4770         vhost->partition_number = -1;
4771         vhost->log_level = log_level;
4772         vhost->task_set = 1;
4773         strcpy(vhost->partition_name, "UNKNOWN");
4774         init_waitqueue_head(&vhost->work_wait_q);
4775         init_waitqueue_head(&vhost->init_wait_q);
4776         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4777         mutex_init(&vhost->passthru_mutex);
4778
4779         if ((rc = ibmvfc_alloc_mem(vhost)))
4780                 goto free_scsi_host;
4781
4782         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4783                                          shost->host_no);
4784
4785         if (IS_ERR(vhost->work_thread)) {
4786                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4787                         PTR_ERR(vhost->work_thread));
4788                 goto free_host_mem;
4789         }
4790
4791         if ((rc = ibmvfc_init_crq(vhost))) {
4792                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4793                 goto kill_kthread;
4794         }
4795
4796         if ((rc = ibmvfc_init_event_pool(vhost))) {
4797                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4798                 goto release_crq;
4799         }
4800
4801         if ((rc = scsi_add_host(shost, dev)))
4802                 goto release_event_pool;
4803
4804         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4805
4806         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4807                                            &ibmvfc_trace_attr))) {
4808                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4809                 goto remove_shost;
4810         }
4811
4812         if (shost_to_fc_host(shost)->rqst_q)
4813                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4814         dev_set_drvdata(dev, vhost);
4815         spin_lock(&ibmvfc_driver_lock);
4816         list_add_tail(&vhost->queue, &ibmvfc_head);
4817         spin_unlock(&ibmvfc_driver_lock);
4818
4819         ibmvfc_send_crq_init(vhost);
4820         scsi_scan_host(shost);
4821         return 0;
4822
4823 remove_shost:
4824         scsi_remove_host(shost);
4825 release_event_pool:
4826         ibmvfc_free_event_pool(vhost);
4827 release_crq:
4828         ibmvfc_release_crq_queue(vhost);
4829 kill_kthread:
4830         kthread_stop(vhost->work_thread);
4831 free_host_mem:
4832         ibmvfc_free_mem(vhost);
4833 free_scsi_host:
4834         scsi_host_put(shost);
4835 out:
4836         LEAVE;
4837         return rc;
4838 }
4839
4840 /**
4841  * ibmvfc_remove - Adapter hot plug remove entry point
4842  * @vdev:       vio device struct
4843  *
4844  * Return value:
4845  *      0
4846  **/
4847 static int ibmvfc_remove(struct vio_dev *vdev)
4848 {
4849         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4850         unsigned long flags;
4851
4852         ENTER;
4853         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4854
4855         spin_lock_irqsave(vhost->host->host_lock, flags);
4856         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4857         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4858
4859         ibmvfc_wait_while_resetting(vhost);
4860         ibmvfc_release_crq_queue(vhost);
4861         kthread_stop(vhost->work_thread);
4862         fc_remove_host(vhost->host);
4863         scsi_remove_host(vhost->host);
4864
4865         spin_lock_irqsave(vhost->host->host_lock, flags);
4866         ibmvfc_purge_requests(vhost, DID_ERROR);
4867         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4868         ibmvfc_free_event_pool(vhost);
4869
4870         ibmvfc_free_mem(vhost);
4871         spin_lock(&ibmvfc_driver_lock);
4872         list_del(&vhost->queue);
4873         spin_unlock(&ibmvfc_driver_lock);
4874         scsi_host_put(vhost->host);
4875         LEAVE;
4876         return 0;
4877 }
4878
4879 /**
4880  * ibmvfc_resume - Resume from suspend
4881  * @dev:        device struct
4882  *
4883  * We may have lost an interrupt across suspend/resume, so kick the
4884  * interrupt handler
4885  *
4886  */
4887 static int ibmvfc_resume(struct device *dev)
4888 {
4889         unsigned long flags;
4890         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4891         struct vio_dev *vdev = to_vio_dev(dev);
4892
4893         spin_lock_irqsave(vhost->host->host_lock, flags);
4894         vio_disable_interrupts(vdev);
4895         tasklet_schedule(&vhost->tasklet);
4896         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4897         return 0;
4898 }
4899
4900 /**
4901  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4902  * @vdev:       vio device struct
4903  *
4904  * Return value:
4905  *      Number of bytes the driver will need to DMA map at the same time in
4906  *      order to perform well.
4907  */
4908 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4909 {
4910         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4911         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4912 }
4913
4914 static const struct vio_device_id ibmvfc_device_table[] = {
4915         {"fcp", "IBM,vfc-client"},
4916         { "", "" }
4917 };
4918 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4919
4920 static const struct dev_pm_ops ibmvfc_pm_ops = {
4921         .resume = ibmvfc_resume
4922 };
4923
4924 static struct vio_driver ibmvfc_driver = {
4925         .id_table = ibmvfc_device_table,
4926         .probe = ibmvfc_probe,
4927         .remove = ibmvfc_remove,
4928         .get_desired_dma = ibmvfc_get_desired_dma,
4929         .name = IBMVFC_NAME,
4930         .pm = &ibmvfc_pm_ops,
4931 };
4932
4933 static struct fc_function_template ibmvfc_transport_functions = {
4934         .show_host_fabric_name = 1,
4935         .show_host_node_name = 1,
4936         .show_host_port_name = 1,
4937         .show_host_supported_classes = 1,
4938         .show_host_port_type = 1,
4939         .show_host_port_id = 1,
4940         .show_host_maxframe_size = 1,
4941
4942         .get_host_port_state = ibmvfc_get_host_port_state,
4943         .show_host_port_state = 1,
4944
4945         .get_host_speed = ibmvfc_get_host_speed,
4946         .show_host_speed = 1,
4947
4948         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4949         .terminate_rport_io = ibmvfc_terminate_rport_io,
4950
4951         .show_rport_maxframe_size = 1,
4952         .show_rport_supported_classes = 1,
4953
4954         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4955         .show_rport_dev_loss_tmo = 1,
4956
4957         .get_starget_node_name = ibmvfc_get_starget_node_name,
4958         .show_starget_node_name = 1,
4959
4960         .get_starget_port_name = ibmvfc_get_starget_port_name,
4961         .show_starget_port_name = 1,
4962
4963         .get_starget_port_id = ibmvfc_get_starget_port_id,
4964         .show_starget_port_id = 1,
4965
4966         .bsg_request = ibmvfc_bsg_request,
4967         .bsg_timeout = ibmvfc_bsg_timeout,
4968 };
4969
4970 /**
4971  * ibmvfc_module_init - Initialize the ibmvfc module
4972  *
4973  * Return value:
4974  *      0 on success / other on failure
4975  **/
4976 static int __init ibmvfc_module_init(void)
4977 {
4978         int rc;
4979
4980         if (!firmware_has_feature(FW_FEATURE_VIO))
4981                 return -ENODEV;
4982
4983         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4984                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4985
4986         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4987         if (!ibmvfc_transport_template)
4988                 return -ENOMEM;
4989
4990         rc = vio_register_driver(&ibmvfc_driver);
4991         if (rc)
4992                 fc_release_transport(ibmvfc_transport_template);
4993         return rc;
4994 }
4995
4996 /**
4997  * ibmvfc_module_exit - Teardown the ibmvfc module
4998  *
4999  * Return value:
5000  *      nothing
5001  **/
5002 static void __exit ibmvfc_module_exit(void)
5003 {
5004         vio_unregister_driver(&ibmvfc_driver);
5005         fc_release_transport(ibmvfc_transport_template);
5006 }
5007
5008 module_init(ibmvfc_module_init);
5009 module_exit(ibmvfc_module_exit);