drivers/scsi/ibmvscsi/ibmvfc.c

   1 /*
   2  * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
   3  *
   4  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
   5  *
   6  * Copyright (C) IBM Corporation, 2008
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/dmapool.h>
  28 #include <linux/delay.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/kthread.h>
  31 #include <linux/slab.h>
  32 #include <linux/of.h>
  33 #include <linux/pm.h>
  34 #include <linux/stringify.h>
  35 #include <linux/bsg-lib.h>
  36 #include <asm/firmware.h>
  37 #include <asm/irq.h>
  38 #include <asm/vio.h>
  39 #include <scsi/scsi.h>
  40 #include <scsi/scsi_cmnd.h>
  41 #include <scsi/scsi_host.h>
  42 #include <scsi/scsi_device.h>
  43 #include <scsi/scsi_tcq.h>
  44 #include <scsi/scsi_transport_fc.h>
  45 #include <scsi/scsi_bsg_fc.h>
  46 #include "ibmvfc.h"
  47
  48 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  49 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  50 static u64 max_lun = IBMVFC_MAX_LUN;
  51 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  52 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  53 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  54 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  55 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  56 static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
  57 static LIST_HEAD(ibmvfc_head);
  58 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  59 static struct scsi_transport_template *ibmvfc_transport_template;
  60
  61 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  62 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  63 MODULE_LICENSE("GPL");
  64 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  65
  66 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  67 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  68                  "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  69 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  70 MODULE_PARM_DESC(default_timeout,
  71                  "Default timeout in seconds for initialization and EH commands. "
  72                  "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  73 module_param_named(max_requests, max_requests, uint, S_IRUGO);
  74 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  75                  "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  76 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
  77 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  78                  "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  79 module_param_named(max_targets, max_targets, uint, S_IRUGO);
  80 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  81                  "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  82 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
  83 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
  84                  "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
  85 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
  86 MODULE_PARM_DESC(debug, "Enable driver debug information. "
  87                  "[Default=" __stringify(IBMVFC_DEBUG) "]");
  88 module_param_named(log_level, log_level, uint, 0);
  89 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
  90                  "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
  91 module_param_named(cls3_error, cls3_error, uint, 0);
  92 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
  93                  "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
  94
  95 static const struct {
  96         u16 status;
  97         u16 error;
  98         u8 result;
  99         u8 retry;
 100         int log;
 101         char *name;
 102 } cmd_status [] = {
 103         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
 104         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
 105         { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
 106         { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
 107         { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
 108         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
 109         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
 110         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
 111         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
 112         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
 113         { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 114         { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 115         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 116         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 117
 118         { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 119         { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 120         { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 121         { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 122         { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 123         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 124         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 125         { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 126         { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 127         { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 128
 129         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 130         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 131         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 132         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 133         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 134         { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 135         { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 136         { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 137         { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 138         { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 139         { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 140
 141         { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 142 };
 143
 144 static void ibmvfc_npiv_login(struct ibmvfc_host *);
 145 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 146 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 147 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 148 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 149
 150 static const char *unknown_error = "unknown error";
 151
 152 #ifdef CONFIG_SCSI_IBMVFC_TRACE
 153 /**
 154  * ibmvfc_trc_start - Log a start trace entry
 155  * @evt:                ibmvfc event struct
 156  *
 157  **/
 158 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 159 {
 160         struct ibmvfc_host *vhost = evt->vhost;
 161         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 162         struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 163         struct ibmvfc_trace_entry *entry;
 164
 165         entry = &vhost->trace[vhost->trace_index++];
 166         entry->evt = evt;
 167         entry->time = jiffies;
 168         entry->fmt = evt->crq.format;
 169         entry->type = IBMVFC_TRC_START;
 170
 171         switch (entry->fmt) {
 172         case IBMVFC_CMD_FORMAT:
 173                 entry->op_code = vfc_cmd->iu.cdb[0];
 174                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 175                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 176                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 177                 entry->u.start.xfer_len = be32_to_cpu(vfc_cmd->iu.xfer_len);
 178                 break;
 179         case IBMVFC_MAD_FORMAT:
 180                 entry->op_code = be32_to_cpu(mad->opcode);
 181                 break;
 182         default:
 183                 break;
 184         }
 185 }
 186
 187 /**
 188  * ibmvfc_trc_end - Log an end trace entry
 189  * @evt:                ibmvfc event struct
 190  *
 191  **/
 192 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 193 {
 194         struct ibmvfc_host *vhost = evt->vhost;
 195         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 196         struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 197         struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
 198
 199         entry->evt = evt;
 200         entry->time = jiffies;
 201         entry->fmt = evt->crq.format;
 202         entry->type = IBMVFC_TRC_END;
 203
 204         switch (entry->fmt) {
 205         case IBMVFC_CMD_FORMAT:
 206                 entry->op_code = vfc_cmd->iu.cdb[0];
 207                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 208                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 209                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 210                 entry->u.end.status = be16_to_cpu(vfc_cmd->status);
 211                 entry->u.end.error = be16_to_cpu(vfc_cmd->error);
 212                 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
 213                 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
 214                 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
 215                 break;
 216         case IBMVFC_MAD_FORMAT:
 217                 entry->op_code = be32_to_cpu(mad->opcode);
 218                 entry->u.end.status = be16_to_cpu(mad->status);
 219                 break;
 220         default:
 221                 break;
 222
 223         }
 224 }
 225
 226 #else
 227 #define ibmvfc_trc_start(evt) do { } while (0)
 228 #define ibmvfc_trc_end(evt) do { } while (0)
 229 #endif
 230
 231 /**
 232  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 233  * @status:             status / error class
 234  * @error:              error
 235  *
 236  * Return value:
 237  *      index into cmd_status / -EINVAL on failure
 238  **/
 239 static int ibmvfc_get_err_index(u16 status, u16 error)
 240 {
 241         int i;
 242
 243         for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 244                 if ((cmd_status[i].status & status) == cmd_status[i].status &&
 245                     cmd_status[i].error == error)
 246                         return i;
 247
 248         return -EINVAL;
 249 }
 250
 251 /**
 252  * ibmvfc_get_cmd_error - Find the error description for the fcp response
 253  * @status:             status / error class
 254  * @error:              error
 255  *
 256  * Return value:
 257  *      error description string
 258  **/
 259 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 260 {
 261         int rc = ibmvfc_get_err_index(status, error);
 262         if (rc >= 0)
 263                 return cmd_status[rc].name;
 264         return unknown_error;
 265 }
 266
 267 /**
 268  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 269  * @vfc_cmd:    ibmvfc command struct
 270  *
 271  * Return value:
 272  *      SCSI result value to return for completed command
 273  **/
 274 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
 275 {
 276         int err;
 277         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
 278         int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
 279
 280         if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 281             ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 282              rsp->data.info.rsp_code))
 283                 return DID_ERROR << 16;
 284
 285         err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
 286         if (err >= 0)
 287                 return rsp->scsi_status | (cmd_status[err].result << 16);
 288         return rsp->scsi_status | (DID_ERROR << 16);
 289 }
 290
 291 /**
 292  * ibmvfc_retry_cmd - Determine if error status is retryable
 293  * @status:             status / error class
 294  * @error:              error
 295  *
 296  * Return value:
 297  *      1 if error should be retried / 0 if it should not
 298  **/
 299 static int ibmvfc_retry_cmd(u16 status, u16 error)
 300 {
 301         int rc = ibmvfc_get_err_index(status, error);
 302
 303         if (rc >= 0)
 304                 return cmd_status[rc].retry;
 305         return 1;
 306 }
 307
 308 static const char *unknown_fc_explain = "unknown fc explain";
 309
 310 static const struct {
 311         u16 fc_explain;
 312         char *name;
 313 } ls_explain [] = {
 314         { 0x00, "no additional explanation" },
 315         { 0x01, "service parameter error - options" },
 316         { 0x03, "service parameter error - initiator control" },
 317         { 0x05, "service parameter error - recipient control" },
 318         { 0x07, "service parameter error - received data field size" },
 319         { 0x09, "service parameter error - concurrent seq" },
 320         { 0x0B, "service parameter error - credit" },
 321         { 0x0D, "invalid N_Port/F_Port_Name" },
 322         { 0x0E, "invalid node/Fabric Name" },
 323         { 0x0F, "invalid common service parameters" },
 324         { 0x11, "invalid association header" },
 325         { 0x13, "association header required" },
 326         { 0x15, "invalid originator S_ID" },
 327         { 0x17, "invalid OX_ID-RX-ID combination" },
 328         { 0x19, "command (request) already in progress" },
 329         { 0x1E, "N_Port Login requested" },
 330         { 0x1F, "Invalid N_Port_ID" },
 331 };
 332
 333 static const struct {
 334         u16 fc_explain;
 335         char *name;
 336 } gs_explain [] = {
 337         { 0x00, "no additional explanation" },
 338         { 0x01, "port identifier not registered" },
 339         { 0x02, "port name not registered" },
 340         { 0x03, "node name not registered" },
 341         { 0x04, "class of service not registered" },
 342         { 0x06, "initial process associator not registered" },
 343         { 0x07, "FC-4 TYPEs not registered" },
 344         { 0x08, "symbolic port name not registered" },
 345         { 0x09, "symbolic node name not registered" },
 346         { 0x0A, "port type not registered" },
 347         { 0xF0, "authorization exception" },
 348         { 0xF1, "authentication exception" },
 349         { 0xF2, "data base full" },
 350         { 0xF3, "data base empty" },
 351         { 0xF4, "processing request" },
 352         { 0xF5, "unable to verify connection" },
 353         { 0xF6, "devices not in a common zone" },
 354 };
 355
 356 /**
 357  * ibmvfc_get_ls_explain - Return the FC Explain description text
 358  * @status:     FC Explain status
 359  *
 360  * Returns:
 361  *      error string
 362  **/
 363 static const char *ibmvfc_get_ls_explain(u16 status)
 364 {
 365         int i;
 366
 367         for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 368                 if (ls_explain[i].fc_explain == status)
 369                         return ls_explain[i].name;
 370
 371         return unknown_fc_explain;
 372 }
 373
 374 /**
 375  * ibmvfc_get_gs_explain - Return the FC Explain description text
 376  * @status:     FC Explain status
 377  *
 378  * Returns:
 379  *      error string
 380  **/
 381 static const char *ibmvfc_get_gs_explain(u16 status)
 382 {
 383         int i;
 384
 385         for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 386                 if (gs_explain[i].fc_explain == status)
 387                         return gs_explain[i].name;
 388
 389         return unknown_fc_explain;
 390 }
 391
 392 static const struct {
 393         enum ibmvfc_fc_type fc_type;
 394         char *name;
 395 } fc_type [] = {
 396         { IBMVFC_FABRIC_REJECT, "fabric reject" },
 397         { IBMVFC_PORT_REJECT, "port reject" },
 398         { IBMVFC_LS_REJECT, "ELS reject" },
 399         { IBMVFC_FABRIC_BUSY, "fabric busy" },
 400         { IBMVFC_PORT_BUSY, "port busy" },
 401         { IBMVFC_BASIC_REJECT, "basic reject" },
 402 };
 403
 404 static const char *unknown_fc_type = "unknown fc type";
 405
 406 /**
 407  * ibmvfc_get_fc_type - Return the FC Type description text
 408  * @status:     FC Type error status
 409  *
 410  * Returns:
 411  *      error string
 412  **/
 413 static const char *ibmvfc_get_fc_type(u16 status)
 414 {
 415         int i;
 416
 417         for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 418                 if (fc_type[i].fc_type == status)
 419                         return fc_type[i].name;
 420
 421         return unknown_fc_type;
 422 }
 423
 424 /**
 425  * ibmvfc_set_tgt_action - Set the next init action for the target
 426  * @tgt:                ibmvfc target struct
 427  * @action:             action to perform
 428  *
 429  **/
 430 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 431                                   enum ibmvfc_target_action action)
 432 {
 433         switch (tgt->action) {
 434         case IBMVFC_TGT_ACTION_DEL_RPORT:
 435                 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
 436                         tgt->action = action;
 437         case IBMVFC_TGT_ACTION_DELETED_RPORT:
 438                 break;
 439         default:
 440                 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
 441                         tgt->add_rport = 0;
 442                 tgt->action = action;
 443                 break;
 444         }
 445 }
 446
 447 /**
 448  * ibmvfc_set_host_state - Set the state for the host
 449  * @vhost:              ibmvfc host struct
 450  * @state:              state to set host to
 451  *
 452  * Returns:
 453  *      0 if state changed / non-zero if not changed
 454  **/
 455 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
 456                                   enum ibmvfc_host_state state)
 457 {
 458         int rc = 0;
 459
 460         switch (vhost->state) {
 461         case IBMVFC_HOST_OFFLINE:
 462                 rc = -EINVAL;
 463                 break;
 464         default:
 465                 vhost->state = state;
 466                 break;
 467         }
 468
 469         return rc;
 470 }
 471
 472 /**
 473  * ibmvfc_set_host_action - Set the next init action for the host
 474  * @vhost:              ibmvfc host struct
 475  * @action:             action to perform
 476  *
 477  **/
 478 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 479                                    enum ibmvfc_host_action action)
 480 {
 481         switch (action) {
 482         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 483                 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
 484                         vhost->action = action;
 485                 break;
 486         case IBMVFC_HOST_ACTION_LOGO_WAIT:
 487                 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
 488                         vhost->action = action;
 489                 break;
 490         case IBMVFC_HOST_ACTION_INIT_WAIT:
 491                 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
 492                         vhost->action = action;
 493                 break;
 494         case IBMVFC_HOST_ACTION_QUERY:
 495                 switch (vhost->action) {
 496                 case IBMVFC_HOST_ACTION_INIT_WAIT:
 497                 case IBMVFC_HOST_ACTION_NONE:
 498                 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 499                         vhost->action = action;
 500                         break;
 501                 default:
 502                         break;
 503                 }
 504                 break;
 505         case IBMVFC_HOST_ACTION_TGT_INIT:
 506                 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 507                         vhost->action = action;
 508                 break;
 509         case IBMVFC_HOST_ACTION_INIT:
 510         case IBMVFC_HOST_ACTION_TGT_DEL:
 511                 switch (vhost->action) {
 512                 case IBMVFC_HOST_ACTION_RESET:
 513                 case IBMVFC_HOST_ACTION_REENABLE:
 514                         break;
 515                 default:
 516                         vhost->action = action;
 517                         break;
 518                 }
 519                 break;
 520         case IBMVFC_HOST_ACTION_LOGO:
 521         case IBMVFC_HOST_ACTION_QUERY_TGTS:
 522         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 523         case IBMVFC_HOST_ACTION_NONE:
 524         case IBMVFC_HOST_ACTION_RESET:
 525         case IBMVFC_HOST_ACTION_REENABLE:
 526         default:
 527                 vhost->action = action;
 528                 break;
 529         }
 530 }
 531
 532 /**
 533  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 534  * @vhost:              ibmvfc host struct
 535  *
 536  * Return value:
 537  *      nothing
 538  **/
 539 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 540 {
 541         if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
 542                 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 543                         scsi_block_requests(vhost->host);
 544                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 545                 }
 546         } else
 547                 vhost->reinit = 1;
 548
 549         wake_up(&vhost->work_wait_q);
 550 }
 551
 552 /**
 553  * ibmvfc_link_down - Handle a link down event from the adapter
 554  * @vhost:      ibmvfc host struct
 555  * @state:      ibmvfc host state to enter
 556  *
 557  **/
 558 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 559                              enum ibmvfc_host_state state)
 560 {
 561         struct ibmvfc_target *tgt;
 562
 563         ENTER;
 564         scsi_block_requests(vhost->host);
 565         list_for_each_entry(tgt, &vhost->targets, queue)
 566                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 567         ibmvfc_set_host_state(vhost, state);
 568         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 569         vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 570         wake_up(&vhost->work_wait_q);
 571         LEAVE;
 572 }
 573
 574 /**
 575  * ibmvfc_init_host - Start host initialization
 576  * @vhost:              ibmvfc host struct
 577  *
 578  * Return value:
 579  *      nothing
 580  **/
 581 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
 582 {
 583         struct ibmvfc_target *tgt;
 584
 585         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 586                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 587                         dev_err(vhost->dev,
 588                                 "Host initialization retries exceeded. Taking adapter offline\n");
 589                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 590                         return;
 591                 }
 592         }
 593
 594         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 595                 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
 596                 vhost->async_crq.cur = 0;
 597
 598                 list_for_each_entry(tgt, &vhost->targets, queue)
 599                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 600                 scsi_block_requests(vhost->host);
 601                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 602                 vhost->job_step = ibmvfc_npiv_login;
 603                 wake_up(&vhost->work_wait_q);
 604         }
 605 }
 606
 607 /**
 608  * ibmvfc_send_crq - Send a CRQ
 609  * @vhost:      ibmvfc host struct
 610  * @word1:      the first 64 bits of the data
 611  * @word2:      the second 64 bits of the data
 612  *
 613  * Return value:
 614  *      0 on success / other on failure
 615  **/
 616 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 617 {
 618         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 619         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 620 }
 621
 622 /**
 623  * ibmvfc_send_crq_init - Send a CRQ init 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(struct ibmvfc_host *vhost)
 630 {
 631         ibmvfc_dbg(vhost, "Sending CRQ init\n");
 632         return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 633 }
 634
 635 /**
 636  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 637  * @vhost:      ibmvfc host struct
 638  *
 639  * Return value:
 640  *      0 on success / other on failure
 641  **/
 642 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 643 {
 644         ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 645         return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 646 }
 647
 648 /**
 649  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 650  * @vhost:      ibmvfc host struct
 651  *
 652  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 653  * the crq with the hypervisor.
 654  **/
 655 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 656 {
 657         long rc = 0;
 658         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 659         struct ibmvfc_crq_queue *crq = &vhost->crq;
 660
 661         ibmvfc_dbg(vhost, "Releasing CRQ\n");
 662         free_irq(vdev->irq, vhost);
 663         tasklet_kill(&vhost->tasklet);
 664         do {
 665                 if (rc)
 666                         msleep(100);
 667                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 668         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 669
 670         vhost->state = IBMVFC_NO_CRQ;
 671         vhost->logged_in = 0;
 672         dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 673         free_page((unsigned long)crq->msgs);
 674 }
 675
 676 /**
 677  * ibmvfc_reenable_crq_queue - reenables the CRQ
 678  * @vhost:      ibmvfc host struct
 679  *
 680  * Return value:
 681  *      0 on success / other on failure
 682  **/
 683 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 684 {
 685         int rc = 0;
 686         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 687
 688         /* Re-enable the CRQ */
 689         do {
 690                 if (rc)
 691                         msleep(100);
 692                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 693         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 694
 695         if (rc)
 696                 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 697
 698         return rc;
 699 }
 700
 701 /**
 702  * ibmvfc_reset_crq - resets a crq after a failure
 703  * @vhost:      ibmvfc host struct
 704  *
 705  * Return value:
 706  *      0 on success / other on failure
 707  **/
 708 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 709 {
 710         int rc = 0;
 711         unsigned long flags;
 712         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 713         struct ibmvfc_crq_queue *crq = &vhost->crq;
 714
 715         /* Close the CRQ */
 716         do {
 717                 if (rc)
 718                         msleep(100);
 719                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 720         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 721
 722         spin_lock_irqsave(vhost->host->host_lock, flags);
 723         vhost->state = IBMVFC_NO_CRQ;
 724         vhost->logged_in = 0;
 725
 726         /* Clean out the queue */
 727         memset(crq->msgs, 0, PAGE_SIZE);
 728         crq->cur = 0;
 729
 730         /* And re-open it again */
 731         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 732                                 crq->msg_token, PAGE_SIZE);
 733
 734         if (rc == H_CLOSED)
 735                 /* Adapter is good, but other end is not ready */
 736                 dev_warn(vhost->dev, "Partner adapter not ready\n");
 737         else if (rc != 0)
 738                 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 739         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 740
 741         return rc;
 742 }
 743
 744 /**
 745  * ibmvfc_valid_event - Determines if event is valid.
 746  * @pool:       event_pool that contains the event
 747  * @evt:        ibmvfc event to be checked for validity
 748  *
 749  * Return value:
 750  *      1 if event is valid / 0 if event is not valid
 751  **/
 752 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
 753                               struct ibmvfc_event *evt)
 754 {
 755         int index = evt - pool->events;
 756         if (index < 0 || index >= pool->size)   /* outside of bounds */
 757                 return 0;
 758         if (evt != pool->events + index)        /* unaligned */
 759                 return 0;
 760         return 1;
 761 }
 762
 763 /**
 764  * ibmvfc_free_event - Free the specified event
 765  * @evt:        ibmvfc_event to be freed
 766  *
 767  **/
 768 static void ibmvfc_free_event(struct ibmvfc_event *evt)
 769 {
 770         struct ibmvfc_host *vhost = evt->vhost;
 771         struct ibmvfc_event_pool *pool = &vhost->pool;
 772
 773         BUG_ON(!ibmvfc_valid_event(pool, evt));
 774         BUG_ON(atomic_inc_return(&evt->free) != 1);
 775         list_add_tail(&evt->queue, &vhost->free);
 776 }
 777
 778 /**
 779  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
 780  * @evt:        ibmvfc event struct
 781  *
 782  * This function does not setup any error status, that must be done
 783  * before this function gets called.
 784  **/
 785 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
 786 {
 787         struct scsi_cmnd *cmnd = evt->cmnd;
 788
 789         if (cmnd) {
 790                 scsi_dma_unmap(cmnd);
 791                 cmnd->scsi_done(cmnd);
 792         }
 793
 794         if (evt->eh_comp)
 795                 complete(evt->eh_comp);
 796
 797         ibmvfc_free_event(evt);
 798 }
 799
 800 /**
 801  * ibmvfc_fail_request - Fail request with specified error code
 802  * @evt:                ibmvfc event struct
 803  * @error_code: error code to fail request with
 804  *
 805  * Return value:
 806  *      none
 807  **/
 808 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
 809 {
 810         if (evt->cmnd) {
 811                 evt->cmnd->result = (error_code << 16);
 812                 evt->done = ibmvfc_scsi_eh_done;
 813         } else
 814                 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
 815
 816         list_del(&evt->queue);
 817         del_timer(&evt->timer);
 818         ibmvfc_trc_end(evt);
 819         evt->done(evt);
 820 }
 821
 822 /**
 823  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
 824  * @vhost:              ibmvfc host struct
 825  * @error_code: error code to fail requests with
 826  *
 827  * Return value:
 828  *      none
 829  **/
 830 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
 831 {
 832         struct ibmvfc_event *evt, *pos;
 833
 834         ibmvfc_dbg(vhost, "Purging all requests\n");
 835         list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
 836                 ibmvfc_fail_request(evt, error_code);
 837 }
 838
 839 /**
 840  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
 841  * @vhost:      struct ibmvfc host to reset
 842  **/
 843 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
 844 {
 845         ibmvfc_purge_requests(vhost, DID_ERROR);
 846         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
 847         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
 848 }
 849
 850 /**
 851  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
 852  * @vhost:      struct ibmvfc host to reset
 853  **/
 854 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
 855 {
 856         if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
 857             !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 858                 scsi_block_requests(vhost->host);
 859                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
 860                 vhost->job_step = ibmvfc_npiv_logout;
 861                 wake_up(&vhost->work_wait_q);
 862         } else
 863                 ibmvfc_hard_reset_host(vhost);
 864 }
 865
 866 /**
 867  * ibmvfc_reset_host - Reset the connection to the server
 868  * @vhost:      ibmvfc host struct
 869  **/
 870 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
 871 {
 872         unsigned long flags;
 873
 874         spin_lock_irqsave(vhost->host->host_lock, flags);
 875         __ibmvfc_reset_host(vhost);
 876         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 877 }
 878
 879 /**
 880  * ibmvfc_retry_host_init - Retry host initialization if allowed
 881  * @vhost:      ibmvfc host struct
 882  *
 883  * Returns: 1 if init will be retried / 0 if not
 884  *
 885  **/
 886 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
 887 {
 888         int retry = 0;
 889
 890         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 891                 vhost->delay_init = 1;
 892                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 893                         dev_err(vhost->dev,
 894                                 "Host initialization retries exceeded. Taking adapter offline\n");
 895                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 896                 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
 897                         __ibmvfc_reset_host(vhost);
 898                 else {
 899                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 900                         retry = 1;
 901                 }
 902         }
 903
 904         wake_up(&vhost->work_wait_q);
 905         return retry;
 906 }
 907
 908 /**
 909  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
 910  * @starget:    scsi target struct
 911  *
 912  * Return value:
 913  *      ibmvfc_target struct / NULL if not found
 914  **/
 915 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
 916 {
 917         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 918         struct ibmvfc_host *vhost = shost_priv(shost);
 919         struct ibmvfc_target *tgt;
 920
 921         list_for_each_entry(tgt, &vhost->targets, queue)
 922                 if (tgt->target_id == starget->id) {
 923                         kref_get(&tgt->kref);
 924                         return tgt;
 925                 }
 926         return NULL;
 927 }
 928
 929 /**
 930  * ibmvfc_get_target - Find the specified scsi_target
 931  * @starget:    scsi target struct
 932  *
 933  * Return value:
 934  *      ibmvfc_target struct / NULL if not found
 935  **/
 936 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
 937 {
 938         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 939         struct ibmvfc_target *tgt;
 940         unsigned long flags;
 941
 942         spin_lock_irqsave(shost->host_lock, flags);
 943         tgt = __ibmvfc_get_target(starget);
 944         spin_unlock_irqrestore(shost->host_lock, flags);
 945         return tgt;
 946 }
 947
 948 /**
 949  * ibmvfc_get_host_speed - Get host port speed
 950  * @shost:              scsi host struct
 951  *
 952  * Return value:
 953  *      none
 954  **/
 955 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
 956 {
 957         struct ibmvfc_host *vhost = shost_priv(shost);
 958         unsigned long flags;
 959
 960         spin_lock_irqsave(shost->host_lock, flags);
 961         if (vhost->state == IBMVFC_ACTIVE) {
 962                 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
 963                 case 1:
 964                         fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
 965                         break;
 966                 case 2:
 967                         fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
 968                         break;
 969                 case 4:
 970                         fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
 971                         break;
 972                 case 8:
 973                         fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
 974                         break;
 975                 case 10:
 976                         fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
 977                         break;
 978                 case 16:
 979                         fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
 980                         break;
 981                 default:
 982                         ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
 983                                    be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
 984                         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 985                         break;
 986                 }
 987         } else
 988                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 989         spin_unlock_irqrestore(shost->host_lock, flags);
 990 }
 991
 992 /**
 993  * ibmvfc_get_host_port_state - Get host port state
 994  * @shost:              scsi host struct
 995  *
 996  * Return value:
 997  *      none
 998  **/
 999 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1000 {
1001         struct ibmvfc_host *vhost = shost_priv(shost);
1002         unsigned long flags;
1003
1004         spin_lock_irqsave(shost->host_lock, flags);
1005         switch (vhost->state) {
1006         case IBMVFC_INITIALIZING:
1007         case IBMVFC_ACTIVE:
1008                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1009                 break;
1010         case IBMVFC_LINK_DOWN:
1011                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1012                 break;
1013         case IBMVFC_LINK_DEAD:
1014         case IBMVFC_HOST_OFFLINE:
1015                 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1016                 break;
1017         case IBMVFC_HALTED:
1018                 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1019                 break;
1020         case IBMVFC_NO_CRQ:
1021                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1022                 break;
1023         default:
1024                 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1025                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1026                 break;
1027         }
1028         spin_unlock_irqrestore(shost->host_lock, flags);
1029 }
1030
1031 /**
1032  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1033  * @rport:              rport struct
1034  * @timeout:    timeout value
1035  *
1036  * Return value:
1037  *      none
1038  **/
1039 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1040 {
1041         if (timeout)
1042                 rport->dev_loss_tmo = timeout;
1043         else
1044                 rport->dev_loss_tmo = 1;
1045 }
1046
1047 /**
1048  * ibmvfc_release_tgt - Free memory allocated for a target
1049  * @kref:               kref struct
1050  *
1051  **/
1052 static void ibmvfc_release_tgt(struct kref *kref)
1053 {
1054         struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1055         kfree(tgt);
1056 }
1057
1058 /**
1059  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1060  * @starget:    scsi target struct
1061  *
1062  * Return value:
1063  *      none
1064  **/
1065 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1066 {
1067         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1068         fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1069         if (tgt)
1070                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1071 }
1072
1073 /**
1074  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1075  * @starget:    scsi target struct
1076  *
1077  * Return value:
1078  *      none
1079  **/
1080 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1081 {
1082         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1083         fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1084         if (tgt)
1085                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1086 }
1087
1088 /**
1089  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1090  * @starget:    scsi target struct
1091  *
1092  * Return value:
1093  *      none
1094  **/
1095 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1096 {
1097         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1098         fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1099         if (tgt)
1100                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1101 }
1102
1103 /**
1104  * ibmvfc_wait_while_resetting - Wait while the host resets
1105  * @vhost:              ibmvfc host struct
1106  *
1107  * Return value:
1108  *      0 on success / other on failure
1109  **/
1110 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1111 {
1112         long timeout = wait_event_timeout(vhost->init_wait_q,
1113                                           ((vhost->state == IBMVFC_ACTIVE ||
1114                                             vhost->state == IBMVFC_HOST_OFFLINE ||
1115                                             vhost->state == IBMVFC_LINK_DEAD) &&
1116                                            vhost->action == IBMVFC_HOST_ACTION_NONE),
1117                                           (init_timeout * HZ));
1118
1119         return timeout ? 0 : -EIO;
1120 }
1121
1122 /**
1123  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1124  * @shost:              scsi host struct
1125  *
1126  * Return value:
1127  *      0 on success / other on failure
1128  **/
1129 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1130 {
1131         struct ibmvfc_host *vhost = shost_priv(shost);
1132
1133         dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1134         ibmvfc_reset_host(vhost);
1135         return ibmvfc_wait_while_resetting(vhost);
1136 }
1137
1138 /**
1139  * ibmvfc_gather_partition_info - Gather info about the LPAR
1140  *
1141  * Return value:
1142  *      none
1143  **/
1144 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1145 {
1146         struct device_node *rootdn;
1147         const char *name;
1148         const unsigned int *num;
1149
1150         rootdn = of_find_node_by_path("/");
1151         if (!rootdn)
1152                 return;
1153
1154         name = of_get_property(rootdn, "ibm,partition-name", NULL);
1155         if (name)
1156                 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1157         num = of_get_property(rootdn, "ibm,partition-no", NULL);
1158         if (num)
1159                 vhost->partition_number = *num;
1160         of_node_put(rootdn);
1161 }
1162
1163 /**
1164  * ibmvfc_set_login_info - Setup info for NPIV login
1165  * @vhost:      ibmvfc host struct
1166  *
1167  * Return value:
1168  *      none
1169  **/
1170 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1171 {
1172         struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1173         struct device_node *of_node = vhost->dev->of_node;
1174         const char *location;
1175
1176         memset(login_info, 0, sizeof(*login_info));
1177
1178         login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1179         login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1180         login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1181         login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1182         login_info->partition_num = cpu_to_be32(vhost->partition_number);
1183         login_info->vfc_frame_version = cpu_to_be32(1);
1184         login_info->fcp_version = cpu_to_be16(3);
1185         login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1186         if (vhost->client_migrated)
1187                 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1188
1189         login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1190         login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE);
1191         login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1192         login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs));
1193         strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1194         strncpy(login_info->device_name,
1195                 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1196
1197         location = of_get_property(of_node, "ibm,loc-code", NULL);
1198         location = location ? location : dev_name(vhost->dev);
1199         strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1200 }
1201
1202 /**
1203  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1204  * @vhost:      ibmvfc host who owns the event pool
1205  *
1206  * Returns zero on success.
1207  **/
1208 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1209 {
1210         int i;
1211         struct ibmvfc_event_pool *pool = &vhost->pool;
1212
1213         ENTER;
1214         pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1215         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1216         if (!pool->events)
1217                 return -ENOMEM;
1218
1219         pool->iu_storage = dma_alloc_coherent(vhost->dev,
1220                                               pool->size * sizeof(*pool->iu_storage),
1221                                               &pool->iu_token, 0);
1222
1223         if (!pool->iu_storage) {
1224                 kfree(pool->events);
1225                 return -ENOMEM;
1226         }
1227
1228         for (i = 0; i < pool->size; ++i) {
1229                 struct ibmvfc_event *evt = &pool->events[i];
1230                 atomic_set(&evt->free, 1);
1231                 evt->crq.valid = 0x80;
1232                 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
1233                 evt->xfer_iu = pool->iu_storage + i;
1234                 evt->vhost = vhost;
1235                 evt->ext_list = NULL;
1236                 list_add_tail(&evt->queue, &vhost->free);
1237         }
1238
1239         LEAVE;
1240         return 0;
1241 }
1242
1243 /**
1244  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1245  * @vhost:      ibmvfc host who owns the event pool
1246  *
1247  **/
1248 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1249 {
1250         int i;
1251         struct ibmvfc_event_pool *pool = &vhost->pool;
1252
1253         ENTER;
1254         for (i = 0; i < pool->size; ++i) {
1255                 list_del(&pool->events[i].queue);
1256                 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1257                 if (pool->events[i].ext_list)
1258                         dma_pool_free(vhost->sg_pool,
1259                                       pool->events[i].ext_list,
1260                                       pool->events[i].ext_list_token);
1261         }
1262
1263         kfree(pool->events);
1264         dma_free_coherent(vhost->dev,
1265                           pool->size * sizeof(*pool->iu_storage),
1266                           pool->iu_storage, pool->iu_token);
1267         LEAVE;
1268 }
1269
1270 /**
1271  * ibmvfc_get_event - Gets the next free event in pool
1272  * @vhost:      ibmvfc host struct
1273  *
1274  * Returns a free event from the pool.
1275  **/
1276 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1277 {
1278         struct ibmvfc_event *evt;
1279
1280         BUG_ON(list_empty(&vhost->free));
1281         evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1282         atomic_set(&evt->free, 0);
1283         list_del(&evt->queue);
1284         return evt;
1285 }
1286
1287 /**
1288  * ibmvfc_init_event - Initialize fields in an event struct that are always
1289  *                              required.
1290  * @evt:        The event
1291  * @done:       Routine to call when the event is responded to
1292  * @format:     SRP or MAD format
1293  **/
1294 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1295                               void (*done) (struct ibmvfc_event *), u8 format)
1296 {
1297         evt->cmnd = NULL;
1298         evt->sync_iu = NULL;
1299         evt->crq.format = format;
1300         evt->done = done;
1301         evt->eh_comp = NULL;
1302 }
1303
1304 /**
1305  * ibmvfc_map_sg_list - Initialize scatterlist
1306  * @scmd:       scsi command struct
1307  * @nseg:       number of scatterlist segments
1308  * @md: memory descriptor list to initialize
1309  **/
1310 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1311                                struct srp_direct_buf *md)
1312 {
1313         int i;
1314         struct scatterlist *sg;
1315
1316         scsi_for_each_sg(scmd, sg, nseg, i) {
1317                 md[i].va = cpu_to_be64(sg_dma_address(sg));
1318                 md[i].len = cpu_to_be32(sg_dma_len(sg));
1319                 md[i].key = 0;
1320         }
1321 }
1322
1323 /**
1324  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1325  * @scmd:               Scsi_Cmnd with the scatterlist
1326  * @evt:                ibmvfc event struct
1327  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1328  * @dev:                device for which to map dma memory
1329  *
1330  * Returns:
1331  *      0 on success / non-zero on failure
1332  **/
1333 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1334                               struct ibmvfc_event *evt,
1335                               struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1336 {
1337
1338         int sg_mapped;
1339         struct srp_direct_buf *data = &vfc_cmd->ioba;
1340         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1341
1342         if (cls3_error)
1343                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1344
1345         sg_mapped = scsi_dma_map(scmd);
1346         if (!sg_mapped) {
1347                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1348                 return 0;
1349         } else if (unlikely(sg_mapped < 0)) {
1350                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1351                         scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1352                 return sg_mapped;
1353         }
1354
1355         if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1356                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1357                 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1358         } else {
1359                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1360                 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1361         }
1362
1363         if (sg_mapped == 1) {
1364                 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1365                 return 0;
1366         }
1367
1368         vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1369
1370         if (!evt->ext_list) {
1371                 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1372                                                &evt->ext_list_token);
1373
1374                 if (!evt->ext_list) {
1375                         scsi_dma_unmap(scmd);
1376                         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1377                                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1378                         return -ENOMEM;
1379                 }
1380         }
1381
1382         ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1383
1384         data->va = cpu_to_be64(evt->ext_list_token);
1385         data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1386         data->key = 0;
1387         return 0;
1388 }
1389
1390 /**
1391  * ibmvfc_timeout - Internal command timeout handler
1392  * @evt:        struct ibmvfc_event that timed out
1393  *
1394  * Called when an internally generated command times out
1395  **/
1396 static void ibmvfc_timeout(struct timer_list *t)
1397 {
1398         struct ibmvfc_event *evt = from_timer(evt, t, timer);
1399         struct ibmvfc_host *vhost = evt->vhost;
1400         dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1401         ibmvfc_reset_host(vhost);
1402 }
1403
1404 /**
1405  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1406  * @evt:                event to be sent
1407  * @vhost:              ibmvfc host struct
1408  * @timeout:    timeout in seconds - 0 means do not time command
1409  *
1410  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1411  **/
1412 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1413                              struct ibmvfc_host *vhost, unsigned long timeout)
1414 {
1415         __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1416         int rc;
1417
1418         /* Copy the IU into the transfer area */
1419         *evt->xfer_iu = evt->iu;
1420         if (evt->crq.format == IBMVFC_CMD_FORMAT)
1421                 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1422         else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1423                 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1424         else
1425                 BUG();
1426
1427         list_add_tail(&evt->queue, &vhost->sent);
1428         timer_setup(&evt->timer, ibmvfc_timeout, 0);
1429
1430         if (timeout) {
1431                 evt->timer.expires = jiffies + (timeout * HZ);
1432                 add_timer(&evt->timer);
1433         }
1434
1435         mb();
1436
1437         if ((rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1438                                   be64_to_cpu(crq_as_u64[1])))) {
1439                 list_del(&evt->queue);
1440                 del_timer(&evt->timer);
1441
1442                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1443                  * Firmware will send a CRQ with a transport event (0xFF) to
1444                  * tell this client what has happened to the transport. This
1445                  * will be handled in ibmvfc_handle_crq()
1446                  */
1447                 if (rc == H_CLOSED) {
1448                         if (printk_ratelimit())
1449                                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1450                         if (evt->cmnd)
1451                                 scsi_dma_unmap(evt->cmnd);
1452                         ibmvfc_free_event(evt);
1453                         return SCSI_MLQUEUE_HOST_BUSY;
1454                 }
1455
1456                 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1457                 if (evt->cmnd) {
1458                         evt->cmnd->result = DID_ERROR << 16;
1459                         evt->done = ibmvfc_scsi_eh_done;
1460                 } else
1461                         evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1462
1463                 evt->done(evt);
1464         } else
1465                 ibmvfc_trc_start(evt);
1466
1467         return 0;
1468 }
1469
1470 /**
1471  * ibmvfc_log_error - Log an error for the failed command if appropriate
1472  * @evt:        ibmvfc event to log
1473  *
1474  **/
1475 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1476 {
1477         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1478         struct ibmvfc_host *vhost = evt->vhost;
1479         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1480         struct scsi_cmnd *cmnd = evt->cmnd;
1481         const char *err = unknown_error;
1482         int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1483         int logerr = 0;
1484         int rsp_code = 0;
1485
1486         if (index >= 0) {
1487                 logerr = cmd_status[index].log;
1488                 err = cmd_status[index].name;
1489         }
1490
1491         if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1492                 return;
1493
1494         if (rsp->flags & FCP_RSP_LEN_VALID)
1495                 rsp_code = rsp->data.info.rsp_code;
1496
1497         scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1498                     "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1499                     cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1500                     rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1501 }
1502
1503 /**
1504  * ibmvfc_relogin - Log back into the specified device
1505  * @sdev:       scsi device struct
1506  *
1507  **/
1508 static void ibmvfc_relogin(struct scsi_device *sdev)
1509 {
1510         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1511         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1512         struct ibmvfc_target *tgt;
1513
1514         list_for_each_entry(tgt, &vhost->targets, queue) {
1515                 if (rport == tgt->rport) {
1516                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1517                         break;
1518                 }
1519         }
1520
1521         ibmvfc_reinit_host(vhost);
1522 }
1523
1524 /**
1525  * ibmvfc_scsi_done - Handle responses from commands
1526  * @evt:        ibmvfc event to be handled
1527  *
1528  * Used as a callback when sending scsi cmds.
1529  **/
1530 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1531 {
1532         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1533         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1534         struct scsi_cmnd *cmnd = evt->cmnd;
1535         u32 rsp_len = 0;
1536         u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1537
1538         if (cmnd) {
1539                 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1540                         scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1541                 else if (rsp->flags & FCP_RESID_UNDER)
1542                         scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1543                 else
1544                         scsi_set_resid(cmnd, 0);
1545
1546                 if (vfc_cmd->status) {
1547                         cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1548
1549                         if (rsp->flags & FCP_RSP_LEN_VALID)
1550                                 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1551                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1552                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1553                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1554                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1555                         if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1556                             (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1557                                 ibmvfc_relogin(cmnd->device);
1558
1559                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1560                                 cmnd->result = (DID_ERROR << 16);
1561
1562                         ibmvfc_log_error(evt);
1563                 }
1564
1565                 if (!cmnd->result &&
1566                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1567                         cmnd->result = (DID_ERROR << 16);
1568
1569                 scsi_dma_unmap(cmnd);
1570                 cmnd->scsi_done(cmnd);
1571         }
1572
1573         if (evt->eh_comp)
1574                 complete(evt->eh_comp);
1575
1576         ibmvfc_free_event(evt);
1577 }
1578
1579 /**
1580  * ibmvfc_host_chkready - Check if the host can accept commands
1581  * @vhost:       struct ibmvfc host
1582  *
1583  * Returns:
1584  *      1 if host can accept command / 0 if not
1585  **/
1586 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1587 {
1588         int result = 0;
1589
1590         switch (vhost->state) {
1591         case IBMVFC_LINK_DEAD:
1592         case IBMVFC_HOST_OFFLINE:
1593                 result = DID_NO_CONNECT << 16;
1594                 break;
1595         case IBMVFC_NO_CRQ:
1596         case IBMVFC_INITIALIZING:
1597         case IBMVFC_HALTED:
1598         case IBMVFC_LINK_DOWN:
1599                 result = DID_REQUEUE << 16;
1600                 break;
1601         case IBMVFC_ACTIVE:
1602                 result = 0;
1603                 break;
1604         }
1605
1606         return result;
1607 }
1608
1609 /**
1610  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1611  * @cmnd:       struct scsi_cmnd to be executed
1612  * @done:       Callback function to be called when cmnd is completed
1613  *
1614  * Returns:
1615  *      0 on success / other on failure
1616  **/
1617 static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
1618                                void (*done) (struct scsi_cmnd *))
1619 {
1620         struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1621         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1622         struct ibmvfc_cmd *vfc_cmd;
1623         struct ibmvfc_event *evt;
1624         int rc;
1625
1626         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1627             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1628                 cmnd->result = rc;
1629                 done(cmnd);
1630                 return 0;
1631         }
1632
1633         cmnd->result = (DID_OK << 16);
1634         evt = ibmvfc_get_event(vhost);
1635         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1636         evt->cmnd = cmnd;
1637         cmnd->scsi_done = done;
1638         vfc_cmd = &evt->iu.cmd;
1639         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1640         vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1641         vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1642         vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1643         vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu));
1644         vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1645         vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata);
1646         vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1647         vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1648         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1649         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1650
1651         if (cmnd->flags & SCMD_TAGGED) {
1652                 vfc_cmd->task_tag = cpu_to_be64(cmnd->tag);
1653                 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1654         }
1655
1656         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1657                 return ibmvfc_send_event(evt, vhost, 0);
1658
1659         ibmvfc_free_event(evt);
1660         if (rc == -ENOMEM)
1661                 return SCSI_MLQUEUE_HOST_BUSY;
1662
1663         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1664                 scmd_printk(KERN_ERR, cmnd,
1665                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1666
1667         cmnd->result = DID_ERROR << 16;
1668         done(cmnd);
1669         return 0;
1670 }
1671
1672 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1673
1674 /**
1675  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1676  * @evt:        ibmvfc event struct
1677  *
1678  **/
1679 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1680 {
1681         /* copy the response back */
1682         if (evt->sync_iu)
1683                 *evt->sync_iu = *evt->xfer_iu;
1684
1685         complete(&evt->comp);
1686 }
1687
1688 /**
1689  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1690  * @evt:        struct ibmvfc_event
1691  *
1692  **/
1693 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1694 {
1695         struct ibmvfc_host *vhost = evt->vhost;
1696
1697         ibmvfc_free_event(evt);
1698         vhost->aborting_passthru = 0;
1699         dev_info(vhost->dev, "Passthru command cancelled\n");
1700 }
1701
1702 /**
1703  * ibmvfc_bsg_timeout - Handle a BSG timeout
1704  * @job:        struct bsg_job that timed out
1705  *
1706  * Returns:
1707  *      0 on success / other on failure
1708  **/
1709 static int ibmvfc_bsg_timeout(struct bsg_job *job)
1710 {
1711         struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
1712         unsigned long port_id = (unsigned long)job->dd_data;
1713         struct ibmvfc_event *evt;
1714         struct ibmvfc_tmf *tmf;
1715         unsigned long flags;
1716         int rc;
1717
1718         ENTER;
1719         spin_lock_irqsave(vhost->host->host_lock, flags);
1720         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1721                 __ibmvfc_reset_host(vhost);
1722                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1723                 return 0;
1724         }
1725
1726         vhost->aborting_passthru = 1;
1727         evt = ibmvfc_get_event(vhost);
1728         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1729
1730         tmf = &evt->iu.tmf;
1731         memset(tmf, 0, sizeof(*tmf));
1732         tmf->common.version = cpu_to_be32(1);
1733         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
1734         tmf->common.length = cpu_to_be16(sizeof(*tmf));
1735         tmf->scsi_id = cpu_to_be64(port_id);
1736         tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1737         tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
1738         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1739
1740         if (rc != 0) {
1741                 vhost->aborting_passthru = 0;
1742                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1743                 rc = -EIO;
1744         } else
1745                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1746                          port_id);
1747
1748         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1749
1750         LEAVE;
1751         return rc;
1752 }
1753
1754 /**
1755  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1756  * @vhost:              struct ibmvfc_host to send command
1757  * @port_id:    port ID to send command
1758  *
1759  * Returns:
1760  *      0 on success / other on failure
1761  **/
1762 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1763 {
1764         struct ibmvfc_port_login *plogi;
1765         struct ibmvfc_target *tgt;
1766         struct ibmvfc_event *evt;
1767         union ibmvfc_iu rsp_iu;
1768         unsigned long flags;
1769         int rc = 0, issue_login = 1;
1770
1771         ENTER;
1772         spin_lock_irqsave(vhost->host->host_lock, flags);
1773         list_for_each_entry(tgt, &vhost->targets, queue) {
1774                 if (tgt->scsi_id == port_id) {
1775                         issue_login = 0;
1776                         break;
1777                 }
1778         }
1779
1780         if (!issue_login)
1781                 goto unlock_out;
1782         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1783                 goto unlock_out;
1784
1785         evt = ibmvfc_get_event(vhost);
1786         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1787         plogi = &evt->iu.plogi;
1788         memset(plogi, 0, sizeof(*plogi));
1789         plogi->common.version = cpu_to_be32(1);
1790         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
1791         plogi->common.length = cpu_to_be16(sizeof(*plogi));
1792         plogi->scsi_id = cpu_to_be64(port_id);
1793         evt->sync_iu = &rsp_iu;
1794         init_completion(&evt->comp);
1795
1796         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1797         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1798
1799         if (rc)
1800                 return -EIO;
1801
1802         wait_for_completion(&evt->comp);
1803
1804         if (rsp_iu.plogi.common.status)
1805                 rc = -EIO;
1806
1807         spin_lock_irqsave(vhost->host->host_lock, flags);
1808         ibmvfc_free_event(evt);
1809 unlock_out:
1810         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1811         LEAVE;
1812         return rc;
1813 }
1814
1815 /**
1816  * ibmvfc_bsg_request - Handle a BSG request
1817  * @job:        struct bsg_job to be executed
1818  *
1819  * Returns:
1820  *      0 on success / other on failure
1821  **/
1822 static int ibmvfc_bsg_request(struct bsg_job *job)
1823 {
1824         struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
1825         struct fc_rport *rport = fc_bsg_to_rport(job);
1826         struct ibmvfc_passthru_mad *mad;
1827         struct ibmvfc_event *evt;
1828         union ibmvfc_iu rsp_iu;
1829         unsigned long flags, port_id = -1;
1830         struct fc_bsg_request *bsg_request = job->request;
1831         struct fc_bsg_reply *bsg_reply = job->reply;
1832         unsigned int code = bsg_request->msgcode;
1833         int rc = 0, req_seg, rsp_seg, issue_login = 0;
1834         u32 fc_flags, rsp_len;
1835
1836         ENTER;
1837         bsg_reply->reply_payload_rcv_len = 0;
1838         if (rport)
1839                 port_id = rport->port_id;
1840
1841         switch (code) {
1842         case FC_BSG_HST_ELS_NOLOGIN:
1843                 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
1844                         (bsg_request->rqst_data.h_els.port_id[1] << 8) |
1845                         bsg_request->rqst_data.h_els.port_id[2];
1846         case FC_BSG_RPT_ELS:
1847                 fc_flags = IBMVFC_FC_ELS;
1848                 break;
1849         case FC_BSG_HST_CT:
1850                 issue_login = 1;
1851                 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
1852                         (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
1853                         bsg_request->rqst_data.h_ct.port_id[2];
1854         case FC_BSG_RPT_CT:
1855                 fc_flags = IBMVFC_FC_CT_IU;
1856                 break;
1857         default:
1858                 return -ENOTSUPP;
1859         }
1860
1861         if (port_id == -1)
1862                 return -EINVAL;
1863         if (!mutex_trylock(&vhost->passthru_mutex))
1864                 return -EBUSY;
1865
1866         job->dd_data = (void *)port_id;
1867         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1868                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1869
1870         if (!req_seg) {
1871                 mutex_unlock(&vhost->passthru_mutex);
1872                 return -ENOMEM;
1873         }
1874
1875         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1876                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1877
1878         if (!rsp_seg) {
1879                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1880                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1881                 mutex_unlock(&vhost->passthru_mutex);
1882                 return -ENOMEM;
1883         }
1884
1885         if (req_seg > 1 || rsp_seg > 1) {
1886                 rc = -EINVAL;
1887                 goto out;
1888         }
1889
1890         if (issue_login)
1891                 rc = ibmvfc_bsg_plogi(vhost, port_id);
1892
1893         spin_lock_irqsave(vhost->host->host_lock, flags);
1894
1895         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1896             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1897                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1898                 goto out;
1899         }
1900
1901         evt = ibmvfc_get_event(vhost);
1902         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1903         mad = &evt->iu.passthru;
1904
1905         memset(mad, 0, sizeof(*mad));
1906         mad->common.version = cpu_to_be32(1);
1907         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
1908         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
1909
1910         mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
1911                 offsetof(struct ibmvfc_passthru_mad, iu));
1912         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
1913
1914         mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
1915         mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
1916         mad->iu.flags = cpu_to_be32(fc_flags);
1917         mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1918
1919         mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
1920         mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
1921         mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
1922         mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
1923         mad->iu.scsi_id = cpu_to_be64(port_id);
1924         mad->iu.tag = cpu_to_be64((u64)evt);
1925         rsp_len = be32_to_cpu(mad->iu.rsp.len);
1926
1927         evt->sync_iu = &rsp_iu;
1928         init_completion(&evt->comp);
1929         rc = ibmvfc_send_event(evt, vhost, 0);
1930         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1931
1932         if (rc) {
1933                 rc = -EIO;
1934                 goto out;
1935         }
1936
1937         wait_for_completion(&evt->comp);
1938
1939         if (rsp_iu.passthru.common.status)
1940                 rc = -EIO;
1941         else
1942                 bsg_reply->reply_payload_rcv_len = rsp_len;
1943
1944         spin_lock_irqsave(vhost->host->host_lock, flags);
1945         ibmvfc_free_event(evt);
1946         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1947         bsg_reply->result = rc;
1948         bsg_job_done(job, bsg_reply->result,
1949                        bsg_reply->reply_payload_rcv_len);
1950         rc = 0;
1951 out:
1952         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1953                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
1954         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1955                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1956         mutex_unlock(&vhost->passthru_mutex);
1957         LEAVE;
1958         return rc;
1959 }
1960
1961 /**
1962  * ibmvfc_reset_device - Reset the device with the specified reset type
1963  * @sdev:       scsi device to reset
1964  * @type:       reset type
1965  * @desc:       reset type description for log messages
1966  *
1967  * Returns:
1968  *      0 on success / other on failure
1969  **/
1970 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1971 {
1972         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1973         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1974         struct ibmvfc_cmd *tmf;
1975         struct ibmvfc_event *evt = NULL;
1976         union ibmvfc_iu rsp_iu;
1977         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1978         int rsp_rc = -EBUSY;
1979         unsigned long flags;
1980         int rsp_code = 0;
1981
1982         spin_lock_irqsave(vhost->host->host_lock, flags);
1983         if (vhost->state == IBMVFC_ACTIVE) {
1984                 evt = ibmvfc_get_event(vhost);
1985                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1986
1987                 tmf = &evt->iu.cmd;
1988                 memset(tmf, 0, sizeof(*tmf));
1989                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1990                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
1991                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1992                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
1993                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
1994                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1995                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
1996                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1997                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
1998                 tmf->iu.tmf_flags = type;
1999                 evt->sync_iu = &rsp_iu;
2000
2001                 init_completion(&evt->comp);
2002                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2003         }
2004         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2005
2006         if (rsp_rc != 0) {
2007                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2008                             desc, rsp_rc);
2009                 return -EIO;
2010         }
2011
2012         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2013         wait_for_completion(&evt->comp);
2014
2015         if (rsp_iu.cmd.status)
2016                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2017
2018         if (rsp_code) {
2019                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2020                         rsp_code = fc_rsp->data.info.rsp_code;
2021
2022                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2023                             "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2024                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2025                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2026                             fc_rsp->scsi_status);
2027                 rsp_rc = -EIO;
2028         } else
2029                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2030
2031         spin_lock_irqsave(vhost->host->host_lock, flags);
2032         ibmvfc_free_event(evt);
2033         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2034         return rsp_rc;
2035 }
2036
2037 /**
2038  * ibmvfc_match_rport - Match function for specified remote port
2039  * @evt:        ibmvfc event struct
2040  * @device:     device to match (rport)
2041  *
2042  * Returns:
2043  *      1 if event matches rport / 0 if event does not match rport
2044  **/
2045 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2046 {
2047         struct fc_rport *cmd_rport;
2048
2049         if (evt->cmnd) {
2050                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2051                 if (cmd_rport == rport)
2052                         return 1;
2053         }
2054         return 0;
2055 }
2056
2057 /**
2058  * ibmvfc_match_target - Match function for specified target
2059  * @evt:        ibmvfc event struct
2060  * @device:     device to match (starget)
2061  *
2062  * Returns:
2063  *      1 if event matches starget / 0 if event does not match starget
2064  **/
2065 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2066 {
2067         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2068                 return 1;
2069         return 0;
2070 }
2071
2072 /**
2073  * ibmvfc_match_lun - Match function for specified LUN
2074  * @evt:        ibmvfc event struct
2075  * @device:     device to match (sdev)
2076  *
2077  * Returns:
2078  *      1 if event matches sdev / 0 if event does not match sdev
2079  **/
2080 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2081 {
2082         if (evt->cmnd && evt->cmnd->device == device)
2083                 return 1;
2084         return 0;
2085 }
2086
2087 /**
2088  * ibmvfc_wait_for_ops - Wait for ops to complete
2089  * @vhost:      ibmvfc host struct
2090  * @device:     device to match (starget or sdev)
2091  * @match:      match function
2092  *
2093  * Returns:
2094  *      SUCCESS / FAILED
2095  **/
2096 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2097                                int (*match) (struct ibmvfc_event *, void *))
2098 {
2099         struct ibmvfc_event *evt;
2100         DECLARE_COMPLETION_ONSTACK(comp);
2101         int wait;
2102         unsigned long flags;
2103         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2104
2105         ENTER;
2106         do {
2107                 wait = 0;
2108                 spin_lock_irqsave(vhost->host->host_lock, flags);
2109                 list_for_each_entry(evt, &vhost->sent, queue) {
2110                         if (match(evt, device)) {
2111                                 evt->eh_comp = &comp;
2112                                 wait++;
2113                         }
2114                 }
2115                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2116
2117                 if (wait) {
2118                         timeout = wait_for_completion_timeout(&comp, timeout);
2119
2120                         if (!timeout) {
2121                                 wait = 0;
2122                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2123                                 list_for_each_entry(evt, &vhost->sent, queue) {
2124                                         if (match(evt, device)) {
2125                                                 evt->eh_comp = NULL;
2126                                                 wait++;
2127                                         }
2128                                 }
2129                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2130                                 if (wait)
2131                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2132                                 LEAVE;
2133                                 return wait ? FAILED : SUCCESS;
2134                         }
2135                 }
2136         } while (wait);
2137
2138         LEAVE;
2139         return SUCCESS;
2140 }
2141
2142 /**
2143  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2144  * @sdev:       scsi device to cancel commands
2145  * @type:       type of error recovery being performed
2146  *
2147  * This sends a cancel to the VIOS for the specified device. This does
2148  * NOT send any abort to the actual device. That must be done separately.
2149  *
2150  * Returns:
2151  *      0 on success / other on failure
2152  **/
2153 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2154 {
2155         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2156         struct scsi_target *starget = scsi_target(sdev);
2157         struct fc_rport *rport = starget_to_rport(starget);
2158         struct ibmvfc_tmf *tmf;
2159         struct ibmvfc_event *evt, *found_evt;
2160         union ibmvfc_iu rsp;
2161         int rsp_rc = -EBUSY;
2162         unsigned long flags;
2163         u16 status;
2164
2165         ENTER;
2166         spin_lock_irqsave(vhost->host->host_lock, flags);
2167         found_evt = NULL;
2168         list_for_each_entry(evt, &vhost->sent, queue) {
2169                 if (evt->cmnd && evt->cmnd->device == sdev) {
2170                         found_evt = evt;
2171                         break;
2172                 }
2173         }
2174
2175         if (!found_evt) {
2176                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2177                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2178                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2179                 return 0;
2180         }
2181
2182         if (vhost->logged_in) {
2183                 evt = ibmvfc_get_event(vhost);
2184                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2185
2186                 tmf = &evt->iu.tmf;
2187                 memset(tmf, 0, sizeof(*tmf));
2188                 tmf->common.version = cpu_to_be32(1);
2189                 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2190                 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2191                 tmf->scsi_id = cpu_to_be64(rport->port_id);
2192                 int_to_scsilun(sdev->lun, &tmf->lun);
2193                 if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS))
2194                         type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2195                 if (vhost->state == IBMVFC_ACTIVE)
2196                         tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2197                 else
2198                         tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2199                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2200                 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2201
2202                 evt->sync_iu = &rsp;
2203                 init_completion(&evt->comp);
2204                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2205         }
2206
2207         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2208
2209         if (rsp_rc != 0) {
2210                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2211                 /* If failure is received, the host adapter is most likely going
2212                  through reset, return success so the caller will wait for the command
2213                  being cancelled to get returned */
2214                 return 0;
2215         }
2216
2217         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2218
2219         wait_for_completion(&evt->comp);
2220         status = be16_to_cpu(rsp.mad_common.status);
2221         spin_lock_irqsave(vhost->host->host_lock, flags);
2222         ibmvfc_free_event(evt);
2223         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2224
2225         if (status != IBMVFC_MAD_SUCCESS) {
2226                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2227                 switch (status) {
2228                 case IBMVFC_MAD_DRIVER_FAILED:
2229                 case IBMVFC_MAD_CRQ_ERROR:
2230                         /* Host adapter most likely going through reset, return success to
2231                          the caller will wait for the command being cancelled to get returned */
2232                         return 0;
2233                 default:
2234                         return -EIO;
2235                 };
2236         }
2237
2238         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2239         return 0;
2240 }
2241
2242 /**
2243  * ibmvfc_match_key - Match function for specified cancel key
2244  * @evt:        ibmvfc event struct
2245  * @key:        cancel key to match
2246  *
2247  * Returns:
2248  *      1 if event matches key / 0 if event does not match key
2249  **/
2250 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2251 {
2252         unsigned long cancel_key = (unsigned long)key;
2253
2254         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2255             be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2256                 return 1;
2257         return 0;
2258 }
2259
2260 /**
2261  * ibmvfc_match_evt - Match function for specified event
2262  * @evt:        ibmvfc event struct
2263  * @match:      event to match
2264  *
2265  * Returns:
2266  *      1 if event matches key / 0 if event does not match key
2267  **/
2268 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2269 {
2270         if (evt == match)
2271                 return 1;
2272         return 0;
2273 }
2274
2275 /**
2276  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2277  * @sdev:       scsi device to abort commands
2278  *
2279  * This sends an Abort Task Set to the VIOS for the specified device. This does
2280  * NOT send any cancel to the VIOS. That must be done separately.
2281  *
2282  * Returns:
2283  *      0 on success / other on failure
2284  **/
2285 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2286 {
2287         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2288         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2289         struct ibmvfc_cmd *tmf;
2290         struct ibmvfc_event *evt, *found_evt;
2291         union ibmvfc_iu rsp_iu;
2292         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2293         int rc, rsp_rc = -EBUSY;
2294         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2295         int rsp_code = 0;
2296
2297         spin_lock_irqsave(vhost->host->host_lock, flags);
2298         found_evt = NULL;
2299         list_for_each_entry(evt, &vhost->sent, queue) {
2300                 if (evt->cmnd && evt->cmnd->device == sdev) {
2301                         found_evt = evt;
2302                         break;
2303                 }
2304         }
2305
2306         if (!found_evt) {
2307                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2308                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2309                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2310                 return 0;
2311         }
2312
2313         if (vhost->state == IBMVFC_ACTIVE) {
2314                 evt = ibmvfc_get_event(vhost);
2315                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2316
2317                 tmf = &evt->iu.cmd;
2318                 memset(tmf, 0, sizeof(*tmf));
2319                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
2320                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
2321                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
2322                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
2323                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
2324                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2325                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
2326                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2327                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2328                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2329                 evt->sync_iu = &rsp_iu;
2330
2331                 init_completion(&evt->comp);
2332                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2333         }
2334
2335         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2336
2337         if (rsp_rc != 0) {
2338                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2339                 return -EIO;
2340         }
2341
2342         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2343         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2344
2345         if (!timeout) {
2346                 rc = ibmvfc_cancel_all(sdev, 0);
2347                 if (!rc) {
2348                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2349                         if (rc == SUCCESS)
2350                                 rc = 0;
2351                 }
2352
2353                 if (rc) {
2354                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2355                         ibmvfc_reset_host(vhost);
2356                         rsp_rc = -EIO;
2357                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2358
2359                         if (rc == SUCCESS)
2360                                 rsp_rc = 0;
2361
2362                         rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2363                         if (rc != SUCCESS) {
2364                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2365                                 ibmvfc_hard_reset_host(vhost);
2366                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2367                                 rsp_rc = 0;
2368                         }
2369
2370                         goto out;
2371                 }
2372         }
2373
2374         if (rsp_iu.cmd.status)
2375                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2376
2377         if (rsp_code) {
2378                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2379                         rsp_code = fc_rsp->data.info.rsp_code;
2380
2381                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2382                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2383                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2384                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2385                             fc_rsp->scsi_status);
2386                 rsp_rc = -EIO;
2387         } else
2388                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2389
2390 out:
2391         spin_lock_irqsave(vhost->host->host_lock, flags);
2392         ibmvfc_free_event(evt);
2393         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2394         return rsp_rc;
2395 }
2396
2397 /**
2398  * ibmvfc_eh_abort_handler - Abort a command
2399  * @cmd:        scsi command to abort
2400  *
2401  * Returns:
2402  *      SUCCESS / FAST_IO_FAIL / FAILED
2403  **/
2404 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2405 {
2406         struct scsi_device *sdev = cmd->device;
2407         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2408         int cancel_rc, block_rc;
2409         int rc = FAILED;
2410
2411         ENTER;
2412         block_rc = fc_block_scsi_eh(cmd);
2413         ibmvfc_wait_while_resetting(vhost);
2414         if (block_rc != FAST_IO_FAIL) {
2415                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2416                 ibmvfc_abort_task_set(sdev);
2417         } else
2418                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2419
2420         if (!cancel_rc)
2421                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2422
2423         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2424                 rc = FAST_IO_FAIL;
2425
2426         LEAVE;
2427         return rc;
2428 }
2429
2430 /**
2431  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2432  * @cmd:        scsi command struct
2433  *
2434  * Returns:
2435  *      SUCCESS / FAST_IO_FAIL / FAILED
2436  **/
2437 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2438 {
2439         struct scsi_device *sdev = cmd->device;
2440         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2441         int cancel_rc, block_rc, reset_rc = 0;
2442         int rc = FAILED;
2443
2444         ENTER;
2445         block_rc = fc_block_scsi_eh(cmd);
2446         ibmvfc_wait_while_resetting(vhost);
2447         if (block_rc != FAST_IO_FAIL) {
2448                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2449                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2450         } else
2451                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2452
2453         if (!cancel_rc && !reset_rc)
2454                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2455
2456         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2457                 rc = FAST_IO_FAIL;
2458
2459         LEAVE;
2460         return rc;
2461 }
2462
2463 /**
2464  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2465  * @sdev:       scsi device struct
2466  * @data:       return code
2467  *
2468  **/
2469 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2470 {
2471         unsigned long *rc = data;
2472         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2473 }
2474
2475 /**
2476  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2477  * @sdev:       scsi device struct
2478  * @data:       return code
2479  *
2480  **/
2481 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2482 {
2483         unsigned long *rc = data;
2484         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2485 }
2486
2487 /**
2488  * ibmvfc_eh_target_reset_handler - Reset the target
2489  * @cmd:        scsi command struct
2490  *
2491  * Returns:
2492  *      SUCCESS / FAST_IO_FAIL / FAILED
2493  **/
2494 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2495 {
2496         struct scsi_device *sdev = cmd->device;
2497         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2498         struct scsi_target *starget = scsi_target(sdev);
2499         int block_rc;
2500         int reset_rc = 0;
2501         int rc = FAILED;
2502         unsigned long cancel_rc = 0;
2503
2504         ENTER;
2505         block_rc = fc_block_scsi_eh(cmd);
2506         ibmvfc_wait_while_resetting(vhost);
2507         if (block_rc != FAST_IO_FAIL) {
2508                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2509                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2510         } else
2511                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2512
2513         if (!cancel_rc && !reset_rc)
2514                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2515
2516         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2517                 rc = FAST_IO_FAIL;
2518
2519         LEAVE;
2520         return rc;
2521 }
2522
2523 /**
2524  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2525  * @cmd:        struct scsi_cmnd having problems
2526  *
2527  **/
2528 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2529 {
2530         int rc;
2531         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2532
2533         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2534         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2535
2536         return rc ? FAILED : SUCCESS;
2537 }
2538
2539 /**
2540  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2541  * @rport:              rport struct
2542  *
2543  * Return value:
2544  *      none
2545  **/
2546 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2547 {
2548         struct Scsi_Host *shost = rport_to_shost(rport);
2549         struct ibmvfc_host *vhost = shost_priv(shost);
2550         struct fc_rport *dev_rport;
2551         struct scsi_device *sdev;
2552         unsigned long rc;
2553
2554         ENTER;
2555         shost_for_each_device(sdev, shost) {
2556                 dev_rport = starget_to_rport(scsi_target(sdev));
2557                 if (dev_rport != rport)
2558                         continue;
2559                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2560         }
2561
2562         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2563
2564         if (rc == FAILED)
2565                 ibmvfc_issue_fc_host_lip(shost);
2566         LEAVE;
2567 }
2568
2569 static const struct ibmvfc_async_desc ae_desc [] = {
2570         { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2571         { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2572         { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2573         { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2574         { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2575         { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
2576         { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
2577         { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
2578         { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
2579         { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
2580         { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
2581         { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
2582         { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2583 };
2584
2585 static const struct ibmvfc_async_desc unknown_ae = {
2586         "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2587 };
2588
2589 /**
2590  * ibmvfc_get_ae_desc - Get text description for async event
2591  * @ae: async event
2592  *
2593  **/
2594 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2595 {
2596         int i;
2597
2598         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2599                 if (ae_desc[i].ae == ae)
2600                         return &ae_desc[i];
2601
2602         return &unknown_ae;
2603 }
2604
2605 static const struct {
2606         enum ibmvfc_ae_link_state state;
2607         const char *desc;
2608 } link_desc [] = {
2609         { IBMVFC_AE_LS_LINK_UP,         " link up" },
2610         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
2611         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
2612         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
2613 };
2614
2615 /**
2616  * ibmvfc_get_link_state - Get text description for link state
2617  * @state:      link state
2618  *
2619  **/
2620 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2621 {
2622         int i;
2623
2624         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2625                 if (link_desc[i].state == state)
2626                         return link_desc[i].desc;
2627
2628         return "";
2629 }
2630
2631 /**
2632  * ibmvfc_handle_async - Handle an async event from the adapter
2633  * @crq:        crq to process
2634  * @vhost:      ibmvfc host struct
2635  *
2636  **/
2637 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2638                                 struct ibmvfc_host *vhost)
2639 {
2640         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
2641         struct ibmvfc_target *tgt;
2642
2643         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2644                    " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
2645                    be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
2646                    ibmvfc_get_link_state(crq->link_state));
2647
2648         switch (be64_to_cpu(crq->event)) {
2649         case IBMVFC_AE_RESUME:
2650                 switch (crq->link_state) {
2651                 case IBMVFC_AE_LS_LINK_DOWN:
2652                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2653                         break;
2654                 case IBMVFC_AE_LS_LINK_DEAD:
2655                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2656                         break;
2657                 case IBMVFC_AE_LS_LINK_UP:
2658                 case IBMVFC_AE_LS_LINK_BOUNCED:
2659                 default:
2660                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2661                         vhost->delay_init = 1;
2662                         __ibmvfc_reset_host(vhost);
2663                         break;
2664                 }
2665
2666                 break;
2667         case IBMVFC_AE_LINK_UP:
2668                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2669                 vhost->delay_init = 1;
2670                 __ibmvfc_reset_host(vhost);
2671                 break;
2672         case IBMVFC_AE_SCN_FABRIC:
2673         case IBMVFC_AE_SCN_DOMAIN:
2674                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2675                 if (vhost->state < IBMVFC_HALTED) {
2676                         vhost->delay_init = 1;
2677                         __ibmvfc_reset_host(vhost);
2678                 }
2679                 break;
2680         case IBMVFC_AE_SCN_NPORT:
2681         case IBMVFC_AE_SCN_GROUP:
2682                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2683                 ibmvfc_reinit_host(vhost);
2684                 break;
2685         case IBMVFC_AE_ELS_LOGO:
2686         case IBMVFC_AE_ELS_PRLO:
2687         case IBMVFC_AE_ELS_PLOGI:
2688                 list_for_each_entry(tgt, &vhost->targets, queue) {
2689                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2690                                 break;
2691                         if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
2692                                 continue;
2693                         if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
2694                                 continue;
2695                         if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
2696                                 continue;
2697                         if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
2698                                 tgt->logo_rcvd = 1;
2699                         if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
2700                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2701                                 ibmvfc_reinit_host(vhost);
2702                         }
2703                 }
2704                 break;
2705         case IBMVFC_AE_LINK_DOWN:
2706         case IBMVFC_AE_ADAPTER_FAILED:
2707                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2708                 break;
2709         case IBMVFC_AE_LINK_DEAD:
2710                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2711                 break;
2712         case IBMVFC_AE_HALT:
2713                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2714                 break;
2715         default:
2716                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2717                 break;
2718         }
2719 }
2720
2721 /**
2722  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2723  * @crq:        Command/Response queue
2724  * @vhost:      ibmvfc host struct
2725  *
2726  **/
2727 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2728 {
2729         long rc;
2730         struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
2731
2732         switch (crq->valid) {
2733         case IBMVFC_CRQ_INIT_RSP:
2734                 switch (crq->format) {
2735                 case IBMVFC_CRQ_INIT:
2736                         dev_info(vhost->dev, "Partner initialized\n");
2737                         /* Send back a response */
2738                         rc = ibmvfc_send_crq_init_complete(vhost);
2739                         if (rc == 0)
2740                                 ibmvfc_init_host(vhost);
2741                         else
2742                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2743                         break;
2744                 case IBMVFC_CRQ_INIT_COMPLETE:
2745                         dev_info(vhost->dev, "Partner initialization complete\n");
2746                         ibmvfc_init_host(vhost);
2747                         break;
2748                 default:
2749                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2750                 }
2751                 return;
2752         case IBMVFC_CRQ_XPORT_EVENT:
2753                 vhost->state = IBMVFC_NO_CRQ;
2754                 vhost->logged_in = 0;
2755                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2756                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2757                         /* We need to re-setup the interpartition connection */
2758                         dev_info(vhost->dev, "Re-enabling adapter\n");
2759                         vhost->client_migrated = 1;
2760                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2761                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2762                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2763                 } else {
2764                         dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2765                         ibmvfc_purge_requests(vhost, DID_ERROR);
2766                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2767                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2768                 }
2769                 return;
2770         case IBMVFC_CRQ_CMD_RSP:
2771                 break;
2772         default:
2773                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2774                 return;
2775         }
2776
2777         if (crq->format == IBMVFC_ASYNC_EVENT)
2778                 return;
2779
2780         /* The only kind of payload CRQs we should get are responses to
2781          * things we send. Make sure this response is to something we
2782          * actually sent
2783          */
2784         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2785                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2786                         crq->ioba);
2787                 return;
2788         }
2789
2790         if (unlikely(atomic_read(&evt->free))) {
2791                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2792                         crq->ioba);
2793                 return;
2794         }
2795
2796         del_timer(&evt->timer);
2797         list_del(&evt->queue);
2798         ibmvfc_trc_end(evt);
2799         evt->done(evt);
2800 }
2801
2802 /**
2803  * ibmvfc_scan_finished - Check if the device scan is done.
2804  * @shost:      scsi host struct
2805  * @time:       current elapsed time
2806  *
2807  * Returns:
2808  *      0 if scan is not done / 1 if scan is done
2809  **/
2810 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2811 {
2812         unsigned long flags;
2813         struct ibmvfc_host *vhost = shost_priv(shost);
2814         int done = 0;
2815
2816         spin_lock_irqsave(shost->host_lock, flags);
2817         if (time >= (init_timeout * HZ)) {
2818                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2819                          "continuing initialization\n", init_timeout);
2820                 done = 1;
2821         }
2822
2823         if (vhost->scan_complete)
2824                 done = 1;
2825         spin_unlock_irqrestore(shost->host_lock, flags);
2826         return done;
2827 }
2828
2829 /**
2830  * ibmvfc_slave_alloc - Setup the device's task set value
2831  * @sdev:       struct scsi_device device to configure
2832  *
2833  * Set the device's task set value so that error handling works as
2834  * expected.
2835  *
2836  * Returns:
2837  *      0 on success / -ENXIO if device does not exist
2838  **/
2839 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2840 {
2841         struct Scsi_Host *shost = sdev->host;
2842         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2843         struct ibmvfc_host *vhost = shost_priv(shost);
2844         unsigned long flags = 0;
2845
2846         if (!rport || fc_remote_port_chkready(rport))
2847                 return -ENXIO;
2848
2849         spin_lock_irqsave(shost->host_lock, flags);
2850         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2851         spin_unlock_irqrestore(shost->host_lock, flags);
2852         return 0;
2853 }
2854
2855 /**
2856  * ibmvfc_target_alloc - Setup the target's task set value
2857  * @starget:    struct scsi_target
2858  *
2859  * Set the target's task set value so that error handling works as
2860  * expected.
2861  *
2862  * Returns:
2863  *      0 on success / -ENXIO if device does not exist
2864  **/
2865 static int ibmvfc_target_alloc(struct scsi_target *starget)
2866 {
2867         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2868         struct ibmvfc_host *vhost = shost_priv(shost);
2869         unsigned long flags = 0;
2870
2871         spin_lock_irqsave(shost->host_lock, flags);
2872         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2873         spin_unlock_irqrestore(shost->host_lock, flags);
2874         return 0;
2875 }
2876
2877 /**
2878  * ibmvfc_slave_configure - Configure the device
2879  * @sdev:       struct scsi_device device to configure
2880  *
2881  * Enable allow_restart for a device if it is a disk. Adjust the
2882  * queue_depth here also.
2883  *
2884  * Returns:
2885  *      0
2886  **/
2887 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2888 {
2889         struct Scsi_Host *shost = sdev->host;
2890         unsigned long flags = 0;
2891
2892         spin_lock_irqsave(shost->host_lock, flags);
2893         if (sdev->type == TYPE_DISK)
2894                 sdev->allow_restart = 1;
2895         spin_unlock_irqrestore(shost->host_lock, flags);
2896         return 0;
2897 }
2898
2899 /**
2900  * ibmvfc_change_queue_depth - Change the device's queue depth
2901  * @sdev:       scsi device struct
2902  * @qdepth:     depth to set
2903  * @reason:     calling context
2904  *
2905  * Return value:
2906  *      actual depth set
2907  **/
2908 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2909 {
2910         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2911                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2912
2913         return scsi_change_queue_depth(sdev, qdepth);
2914 }
2915
2916 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2917                                                  struct device_attribute *attr, char *buf)
2918 {
2919         struct Scsi_Host *shost = class_to_shost(dev);
2920         struct ibmvfc_host *vhost = shost_priv(shost);
2921
2922         return snprintf(buf, PAGE_SIZE, "%s\n",
2923                         vhost->login_buf->resp.partition_name);
2924 }
2925
2926 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2927                                             struct device_attribute *attr, char *buf)
2928 {
2929         struct Scsi_Host *shost = class_to_shost(dev);
2930         struct ibmvfc_host *vhost = shost_priv(shost);
2931
2932         return snprintf(buf, PAGE_SIZE, "%s\n",
2933                         vhost->login_buf->resp.device_name);
2934 }
2935
2936 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2937                                          struct device_attribute *attr, char *buf)
2938 {
2939         struct Scsi_Host *shost = class_to_shost(dev);
2940         struct ibmvfc_host *vhost = shost_priv(shost);
2941
2942         return snprintf(buf, PAGE_SIZE, "%s\n",
2943                         vhost->login_buf->resp.port_loc_code);
2944 }
2945
2946 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2947                                          struct device_attribute *attr, char *buf)
2948 {
2949         struct Scsi_Host *shost = class_to_shost(dev);
2950         struct ibmvfc_host *vhost = shost_priv(shost);
2951
2952         return snprintf(buf, PAGE_SIZE, "%s\n",
2953                         vhost->login_buf->resp.drc_name);
2954 }
2955
2956 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2957                                              struct device_attribute *attr, char *buf)
2958 {
2959         struct Scsi_Host *shost = class_to_shost(dev);
2960         struct ibmvfc_host *vhost = shost_priv(shost);
2961         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2962 }
2963
2964 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2965                                              struct device_attribute *attr, char *buf)
2966 {
2967         struct Scsi_Host *shost = class_to_shost(dev);
2968         struct ibmvfc_host *vhost = shost_priv(shost);
2969         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2970 }
2971
2972 /**
2973  * ibmvfc_show_log_level - Show the adapter's error logging level
2974  * @dev:        class device struct
2975  * @buf:        buffer
2976  *
2977  * Return value:
2978  *      number of bytes printed to buffer
2979  **/
2980 static ssize_t ibmvfc_show_log_level(struct device *dev,
2981                                      struct device_attribute *attr, char *buf)
2982 {
2983         struct Scsi_Host *shost = class_to_shost(dev);
2984         struct ibmvfc_host *vhost = shost_priv(shost);
2985         unsigned long flags = 0;
2986         int len;
2987
2988         spin_lock_irqsave(shost->host_lock, flags);
2989         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2990         spin_unlock_irqrestore(shost->host_lock, flags);
2991         return len;
2992 }
2993
2994 /**
2995  * ibmvfc_store_log_level - Change the adapter's error logging level
2996  * @dev:        class device struct
2997  * @buf:        buffer
2998  *
2999  * Return value:
3000  *      number of bytes printed to buffer
3001  **/
3002 static ssize_t ibmvfc_store_log_level(struct device *dev,
3003                                       struct device_attribute *attr,
3004                                       const char *buf, size_t count)
3005 {
3006         struct Scsi_Host *shost = class_to_shost(dev);
3007         struct ibmvfc_host *vhost = shost_priv(shost);
3008         unsigned long flags = 0;
3009
3010         spin_lock_irqsave(shost->host_lock, flags);
3011         vhost->log_level = simple_strtoul(buf, NULL, 10);
3012         spin_unlock_irqrestore(shost->host_lock, flags);
3013         return strlen(buf);
3014 }
3015
3016 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3017 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3018 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3019 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3020 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3021 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3022 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3023                    ibmvfc_show_log_level, ibmvfc_store_log_level);
3024
3025 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3026 /**
3027  * ibmvfc_read_trace - Dump the adapter trace
3028  * @filp:               open sysfs file
3029  * @kobj:               kobject struct
3030  * @bin_attr:   bin_attribute struct
3031  * @buf:                buffer
3032  * @off:                offset
3033  * @count:              buffer size
3034  *
3035  * Return value:
3036  *      number of bytes printed to buffer
3037  **/
3038 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3039                                  struct bin_attribute *bin_attr,
3040                                  char *buf, loff_t off, size_t count)
3041 {
3042         struct device *dev = container_of(kobj, struct device, kobj);
3043         struct Scsi_Host *shost = class_to_shost(dev);
3044         struct ibmvfc_host *vhost = shost_priv(shost);
3045         unsigned long flags = 0;
3046         int size = IBMVFC_TRACE_SIZE;
3047         char *src = (char *)vhost->trace;
3048
3049         if (off > size)
3050                 return 0;
3051         if (off + count > size) {
3052                 size -= off;
3053                 count = size;
3054         }
3055
3056         spin_lock_irqsave(shost->host_lock, flags);
3057         memcpy(buf, &src[off], count);
3058         spin_unlock_irqrestore(shost->host_lock, flags);
3059         return count;
3060 }
3061
3062 static struct bin_attribute ibmvfc_trace_attr = {
3063         .attr = {
3064                 .name = "trace",
3065                 .mode = S_IRUGO,
3066         },
3067         .size = 0,
3068         .read = ibmvfc_read_trace,
3069 };
3070 #endif
3071
3072 static struct device_attribute *ibmvfc_attrs[] = {
3073         &dev_attr_partition_name,
3074         &dev_attr_device_name,
3075         &dev_attr_port_loc_code,
3076         &dev_attr_drc_name,
3077         &dev_attr_npiv_version,
3078         &dev_attr_capabilities,
3079         &dev_attr_log_level,
3080         NULL
3081 };
3082
3083 static struct scsi_host_template driver_template = {
3084         .module = THIS_MODULE,
3085         .name = "IBM POWER Virtual FC Adapter",
3086         .proc_name = IBMVFC_NAME,
3087         .queuecommand = ibmvfc_queuecommand,
3088         .eh_timed_out = fc_eh_timed_out,
3089         .eh_abort_handler = ibmvfc_eh_abort_handler,
3090         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3091         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3092         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3093         .slave_alloc = ibmvfc_slave_alloc,
3094         .slave_configure = ibmvfc_slave_configure,
3095         .target_alloc = ibmvfc_target_alloc,
3096         .scan_finished = ibmvfc_scan_finished,
3097         .change_queue_depth = ibmvfc_change_queue_depth,
3098         .cmd_per_lun = 16,
3099         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3100         .this_id = -1,
3101         .sg_tablesize = SG_ALL,
3102         .max_sectors = IBMVFC_MAX_SECTORS,
3103         .use_clustering = ENABLE_CLUSTERING,
3104         .shost_attrs = ibmvfc_attrs,
3105         .track_queue_depth = 1,
3106 };
3107
3108 /**
3109  * ibmvfc_next_async_crq - Returns the next entry in async queue
3110  * @vhost:      ibmvfc host struct
3111  *
3112  * Returns:
3113  *      Pointer to next entry in queue / NULL if empty
3114  **/
3115 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3116 {
3117         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3118         struct ibmvfc_async_crq *crq;
3119
3120         crq = &async_crq->msgs[async_crq->cur];
3121         if (crq->valid & 0x80) {
3122                 if (++async_crq->cur == async_crq->size)
3123                         async_crq->cur = 0;
3124                 rmb();
3125         } else
3126                 crq = NULL;
3127
3128         return crq;
3129 }
3130
3131 /**
3132  * ibmvfc_next_crq - Returns the next entry in message queue
3133  * @vhost:      ibmvfc host struct
3134  *
3135  * Returns:
3136  *      Pointer to next entry in queue / NULL if empty
3137  **/
3138 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3139 {
3140         struct ibmvfc_crq_queue *queue = &vhost->crq;
3141         struct ibmvfc_crq *crq;
3142
3143         crq = &queue->msgs[queue->cur];
3144         if (crq->valid & 0x80) {
3145                 if (++queue->cur == queue->size)
3146                         queue->cur = 0;
3147                 rmb();
3148         } else
3149                 crq = NULL;
3150
3151         return crq;
3152 }
3153
3154 /**
3155  * ibmvfc_interrupt - Interrupt handler
3156  * @irq:                number of irq to handle, not used
3157  * @dev_instance: ibmvfc_host that received interrupt
3158  *
3159  * Returns:
3160  *      IRQ_HANDLED
3161  **/
3162 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3163 {
3164         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3165         unsigned long flags;
3166
3167         spin_lock_irqsave(vhost->host->host_lock, flags);
3168         vio_disable_interrupts(to_vio_dev(vhost->dev));
3169         tasklet_schedule(&vhost->tasklet);
3170         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3171         return IRQ_HANDLED;
3172 }
3173
3174 /**
3175  * ibmvfc_tasklet - Interrupt handler tasklet
3176  * @data:               ibmvfc host struct
3177  *
3178  * Returns:
3179  *      Nothing
3180  **/
3181 static void ibmvfc_tasklet(void *data)
3182 {
3183         struct ibmvfc_host *vhost = data;
3184         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3185         struct ibmvfc_crq *crq;
3186         struct ibmvfc_async_crq *async;
3187         unsigned long flags;
3188         int done = 0;
3189
3190         spin_lock_irqsave(vhost->host->host_lock, flags);
3191         while (!done) {
3192                 /* Pull all the valid messages off the async CRQ */
3193                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3194                         ibmvfc_handle_async(async, vhost);
3195                         async->valid = 0;
3196                         wmb();
3197                 }
3198
3199                 /* Pull all the valid messages off the CRQ */
3200                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3201                         ibmvfc_handle_crq(crq, vhost);
3202                         crq->valid = 0;
3203                         wmb();
3204                 }
3205
3206                 vio_enable_interrupts(vdev);
3207                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3208                         vio_disable_interrupts(vdev);
3209                         ibmvfc_handle_async(async, vhost);
3210                         async->valid = 0;
3211                         wmb();
3212                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3213                         vio_disable_interrupts(vdev);
3214                         ibmvfc_handle_crq(crq, vhost);
3215                         crq->valid = 0;
3216                         wmb();
3217                 } else
3218                         done = 1;
3219         }
3220
3221         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3222 }
3223
3224 /**
3225  * ibmvfc_init_tgt - Set the next init job step for the target
3226  * @tgt:                ibmvfc target struct
3227  * @job_step:   job step to perform
3228  *
3229  **/
3230 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3231                             void (*job_step) (struct ibmvfc_target *))
3232 {
3233         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3234         tgt->job_step = job_step;
3235         wake_up(&tgt->vhost->work_wait_q);
3236 }
3237
3238 /**
3239  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3240  * @tgt:                ibmvfc target struct
3241  * @job_step:   initialization job step
3242  *
3243  * Returns: 1 if step will be retried / 0 if not
3244  *
3245  **/
3246 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3247                                   void (*job_step) (struct ibmvfc_target *))
3248 {
3249         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3250                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3251                 wake_up(&tgt->vhost->work_wait_q);
3252                 return 0;
3253         } else
3254                 ibmvfc_init_tgt(tgt, job_step);
3255         return 1;
3256 }
3257
3258 /* Defined in FC-LS */
3259 static const struct {
3260         int code;
3261         int retry;
3262         int logged_in;
3263 } prli_rsp [] = {
3264         { 0, 1, 0 },
3265         { 1, 0, 1 },
3266         { 2, 1, 0 },
3267         { 3, 1, 0 },
3268         { 4, 0, 0 },
3269         { 5, 0, 0 },
3270         { 6, 0, 1 },
3271         { 7, 0, 0 },
3272         { 8, 1, 0 },
3273 };
3274
3275 /**
3276  * ibmvfc_get_prli_rsp - Find PRLI response index
3277  * @flags:      PRLI response flags
3278  *
3279  **/
3280 static int ibmvfc_get_prli_rsp(u16 flags)
3281 {
3282         int i;
3283         int code = (flags & 0x0f00) >> 8;
3284
3285         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3286                 if (prli_rsp[i].code == code)
3287                         return i;
3288
3289         return 0;
3290 }
3291
3292 /**
3293  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3294  * @evt:        ibmvfc event struct
3295  *
3296  **/
3297 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3298 {
3299         struct ibmvfc_target *tgt = evt->tgt;
3300         struct ibmvfc_host *vhost = evt->vhost;
3301         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3302         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3303         u32 status = be16_to_cpu(rsp->common.status);
3304         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3305
3306         vhost->discovery_threads--;
3307         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3308         switch (status) {
3309         case IBMVFC_MAD_SUCCESS:
3310                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3311                         parms->type, parms->flags, parms->service_parms);
3312
3313                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3314                         index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3315                         if (prli_rsp[index].logged_in) {
3316                                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3317                                         tgt->need_login = 0;
3318                                         tgt->ids.roles = 0;
3319                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3320                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3321                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3322                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3323                                         tgt->add_rport = 1;
3324                                 } else
3325                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3326                         } else if (prli_rsp[index].retry)
3327                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3328                         else
3329                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3330                 } else
3331                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3332                 break;
3333         case IBMVFC_MAD_DRIVER_FAILED:
3334                 break;
3335         case IBMVFC_MAD_CRQ_ERROR:
3336                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3337                 break;
3338         case IBMVFC_MAD_FAILED:
3339         default:
3340                 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3341                      be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3342                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3343                 else if (tgt->logo_rcvd)
3344                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3345                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3346                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3347                 else
3348                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3349
3350                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3351                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3352                         rsp->status, rsp->error, status);
3353                 break;
3354         }
3355
3356         kref_put(&tgt->kref, ibmvfc_release_tgt);
3357         ibmvfc_free_event(evt);
3358         wake_up(&vhost->work_wait_q);
3359 }
3360
3361 /**
3362  * ibmvfc_tgt_send_prli - Send a process login
3363  * @tgt:        ibmvfc target struct
3364  *
3365  **/
3366 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3367 {
3368         struct ibmvfc_process_login *prli;
3369         struct ibmvfc_host *vhost = tgt->vhost;
3370         struct ibmvfc_event *evt;
3371
3372         if (vhost->discovery_threads >= disc_threads)
3373                 return;
3374
3375         kref_get(&tgt->kref);
3376         evt = ibmvfc_get_event(vhost);
3377         vhost->discovery_threads++;
3378         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3379         evt->tgt = tgt;
3380         prli = &evt->iu.prli;
3381         memset(prli, 0, sizeof(*prli));
3382         prli->common.version = cpu_to_be32(1);
3383         prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
3384         prli->common.length = cpu_to_be16(sizeof(*prli));
3385         prli->scsi_id = cpu_to_be64(tgt->scsi_id);
3386
3387         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3388         prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
3389         prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
3390         prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
3391
3392         if (cls3_error)
3393                 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
3394
3395         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3396         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3397                 vhost->discovery_threads--;
3398                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3399                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3400         } else
3401                 tgt_dbg(tgt, "Sent process login\n");
3402 }
3403
3404 /**
3405  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3406  * @evt:        ibmvfc event struct
3407  *
3408  **/
3409 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3410 {
3411         struct ibmvfc_target *tgt = evt->tgt;
3412         struct ibmvfc_host *vhost = evt->vhost;
3413         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3414         u32 status = be16_to_cpu(rsp->common.status);
3415         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3416
3417         vhost->discovery_threads--;
3418         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3419         switch (status) {
3420         case IBMVFC_MAD_SUCCESS:
3421                 tgt_dbg(tgt, "Port Login succeeded\n");
3422                 if (tgt->ids.port_name &&
3423                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3424                         vhost->reinit = 1;
3425                         tgt_dbg(tgt, "Port re-init required\n");
3426                         break;
3427                 }
3428                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3429                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3430                 tgt->ids.port_id = tgt->scsi_id;
3431                 memcpy(&tgt->service_parms, &rsp->service_parms,
3432                        sizeof(tgt->service_parms));
3433                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3434                        sizeof(tgt->service_parms_change));
3435                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3436                 break;
3437         case IBMVFC_MAD_DRIVER_FAILED:
3438                 break;
3439         case IBMVFC_MAD_CRQ_ERROR:
3440                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3441                 break;
3442         case IBMVFC_MAD_FAILED:
3443         default:
3444                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3445                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3446                 else
3447                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3448
3449                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3450                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), rsp->status, rsp->error,
3451                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), rsp->fc_type,
3452                         ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), rsp->fc_explain, status);
3453                 break;
3454         }
3455
3456         kref_put(&tgt->kref, ibmvfc_release_tgt);
3457         ibmvfc_free_event(evt);
3458         wake_up(&vhost->work_wait_q);
3459 }
3460
3461 /**
3462  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3463  * @tgt:        ibmvfc target struct
3464  *
3465  **/
3466 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3467 {
3468         struct ibmvfc_port_login *plogi;
3469         struct ibmvfc_host *vhost = tgt->vhost;
3470         struct ibmvfc_event *evt;
3471
3472         if (vhost->discovery_threads >= disc_threads)
3473                 return;
3474
3475         kref_get(&tgt->kref);
3476         tgt->logo_rcvd = 0;
3477         evt = ibmvfc_get_event(vhost);
3478         vhost->discovery_threads++;
3479         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3480         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3481         evt->tgt = tgt;
3482         plogi = &evt->iu.plogi;
3483         memset(plogi, 0, sizeof(*plogi));
3484         plogi->common.version = cpu_to_be32(1);
3485         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
3486         plogi->common.length = cpu_to_be16(sizeof(*plogi));
3487         plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
3488
3489         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3490                 vhost->discovery_threads--;
3491                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3492                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3493         } else
3494                 tgt_dbg(tgt, "Sent port login\n");
3495 }
3496
3497 /**
3498  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3499  * @evt:        ibmvfc event struct
3500  *
3501  **/
3502 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3503 {
3504         struct ibmvfc_target *tgt = evt->tgt;
3505         struct ibmvfc_host *vhost = evt->vhost;
3506         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3507         u32 status = be16_to_cpu(rsp->common.status);
3508
3509         vhost->discovery_threads--;
3510         ibmvfc_free_event(evt);
3511         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3512
3513         switch (status) {
3514         case IBMVFC_MAD_SUCCESS:
3515                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3516                 break;
3517         case IBMVFC_MAD_DRIVER_FAILED:
3518                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3519                 wake_up(&vhost->work_wait_q);
3520                 return;
3521         case IBMVFC_MAD_FAILED:
3522         default:
3523                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3524                 break;
3525         }
3526
3527         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3528                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3529         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3530                  tgt->scsi_id != tgt->new_scsi_id)
3531                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3532         kref_put(&tgt->kref, ibmvfc_release_tgt);
3533         wake_up(&vhost->work_wait_q);
3534 }
3535
3536 /**
3537  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3538  * @tgt:                ibmvfc target struct
3539  *
3540  **/
3541 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3542 {
3543         struct ibmvfc_implicit_logout *mad;
3544         struct ibmvfc_host *vhost = tgt->vhost;
3545         struct ibmvfc_event *evt;
3546
3547         if (vhost->discovery_threads >= disc_threads)
3548                 return;
3549
3550         kref_get(&tgt->kref);
3551         evt = ibmvfc_get_event(vhost);
3552         vhost->discovery_threads++;
3553         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3554         evt->tgt = tgt;
3555         mad = &evt->iu.implicit_logout;
3556         memset(mad, 0, sizeof(*mad));
3557         mad->common.version = cpu_to_be32(1);
3558         mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
3559         mad->common.length = cpu_to_be16(sizeof(*mad));
3560         mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
3561
3562         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3563         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3564                 vhost->discovery_threads--;
3565                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3566                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3567         } else
3568                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3569 }
3570
3571 /**
3572  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3573  * @mad:        ibmvfc passthru mad struct
3574  * @tgt:        ibmvfc target struct
3575  *
3576  * Returns:
3577  *      1 if PLOGI needed / 0 if PLOGI not needed
3578  **/
3579 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3580                                     struct ibmvfc_target *tgt)
3581 {
3582         if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
3583                 return 1;
3584         if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
3585                 return 1;
3586         if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
3587                 return 1;
3588         return 0;
3589 }
3590
3591 /**
3592  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3593  * @evt:        ibmvfc event struct
3594  *
3595  **/
3596 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3597 {
3598         struct ibmvfc_target *tgt = evt->tgt;
3599         struct ibmvfc_host *vhost = evt->vhost;
3600         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3601         u32 status = be16_to_cpu(mad->common.status);
3602         u8 fc_reason, fc_explain;
3603
3604         vhost->discovery_threads--;
3605         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3606         del_timer(&tgt->timer);
3607
3608         switch (status) {
3609         case IBMVFC_MAD_SUCCESS:
3610                 tgt_dbg(tgt, "ADISC succeeded\n");
3611                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3612                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3613                 break;
3614         case IBMVFC_MAD_DRIVER_FAILED:
3615                 break;
3616         case IBMVFC_MAD_FAILED:
3617         default:
3618                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3619                 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
3620                 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
3621                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3622                          ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
3623                          mad->iu.status, mad->iu.error,
3624                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3625                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3626                 break;
3627         }
3628
3629         kref_put(&tgt->kref, ibmvfc_release_tgt);
3630         ibmvfc_free_event(evt);
3631         wake_up(&vhost->work_wait_q);
3632 }
3633
3634 /**
3635  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3636  * @evt:                ibmvfc event struct
3637  *
3638  **/
3639 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3640 {
3641         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3642
3643         memset(mad, 0, sizeof(*mad));
3644         mad->common.version = cpu_to_be32(1);
3645         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
3646         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
3647         mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3648                 offsetof(struct ibmvfc_passthru_mad, iu));
3649         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
3650         mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3651         mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
3652         mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3653                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3654                 offsetof(struct ibmvfc_passthru_fc_iu, payload));
3655         mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3656         mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3657                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3658                 offsetof(struct ibmvfc_passthru_fc_iu, response));
3659         mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
3660 }
3661
3662 /**
3663  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3664  * @evt:                ibmvfc event struct
3665  *
3666  * Just cleanup this event struct. Everything else is handled by
3667  * the ADISC completion handler. If the ADISC never actually comes
3668  * back, we still have the timer running on the ADISC event struct
3669  * which will fire and cause the CRQ to get reset.
3670  *
3671  **/
3672 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3673 {
3674         struct ibmvfc_host *vhost = evt->vhost;
3675         struct ibmvfc_target *tgt = evt->tgt;
3676
3677         tgt_dbg(tgt, "ADISC cancel complete\n");
3678         vhost->abort_threads--;
3679         ibmvfc_free_event(evt);
3680         kref_put(&tgt->kref, ibmvfc_release_tgt);
3681         wake_up(&vhost->work_wait_q);
3682 }
3683
3684 /**
3685  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3686  * @tgt:                ibmvfc target struct
3687  *
3688  * If an ADISC times out, send a cancel. If the cancel times
3689  * out, reset the CRQ. When the ADISC comes back as cancelled,
3690  * log back into the target.
3691  **/
3692 static void ibmvfc_adisc_timeout(struct timer_list *t)
3693 {
3694         struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
3695         struct ibmvfc_host *vhost = tgt->vhost;
3696         struct ibmvfc_event *evt;
3697         struct ibmvfc_tmf *tmf;
3698         unsigned long flags;
3699         int rc;
3700
3701         tgt_dbg(tgt, "ADISC timeout\n");
3702         spin_lock_irqsave(vhost->host->host_lock, flags);
3703         if (vhost->abort_threads >= disc_threads ||
3704             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3705             vhost->state != IBMVFC_INITIALIZING ||
3706             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3707                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3708                 return;
3709         }
3710
3711         vhost->abort_threads++;
3712         kref_get(&tgt->kref);
3713         evt = ibmvfc_get_event(vhost);
3714         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3715
3716         evt->tgt = tgt;
3717         tmf = &evt->iu.tmf;
3718         memset(tmf, 0, sizeof(*tmf));
3719         tmf->common.version = cpu_to_be32(1);
3720         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
3721         tmf->common.length = cpu_to_be16(sizeof(*tmf));
3722         tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
3723         tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
3724
3725         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3726
3727         if (rc) {
3728                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3729                 vhost->abort_threads--;
3730                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3731                 __ibmvfc_reset_host(vhost);
3732         } else
3733                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3734         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3735 }
3736
3737 /**
3738  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3739  * @tgt:                ibmvfc target struct
3740  *
3741  * When sending an ADISC we end up with two timers running. The
3742  * first timer is the timer in the ibmvfc target struct. If this
3743  * fires, we send a cancel to the target. The second timer is the
3744  * timer on the ibmvfc event for the ADISC, which is longer. If that
3745  * fires, it means the ADISC timed out and our attempt to cancel it
3746  * also failed, so we need to reset the CRQ.
3747  **/
3748 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3749 {
3750         struct ibmvfc_passthru_mad *mad;
3751         struct ibmvfc_host *vhost = tgt->vhost;
3752         struct ibmvfc_event *evt;
3753
3754         if (vhost->discovery_threads >= disc_threads)
3755                 return;
3756
3757         kref_get(&tgt->kref);
3758         evt = ibmvfc_get_event(vhost);
3759         vhost->discovery_threads++;
3760         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3761         evt->tgt = tgt;
3762
3763         ibmvfc_init_passthru(evt);
3764         mad = &evt->iu.passthru;
3765         mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
3766         mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
3767         mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
3768
3769         mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
3770         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3771                sizeof(vhost->login_buf->resp.port_name));
3772         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3773                sizeof(vhost->login_buf->resp.node_name));
3774         mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
3775
3776         if (timer_pending(&tgt->timer))
3777                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3778         else {
3779                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3780                 add_timer(&tgt->timer);
3781         }
3782
3783         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3784         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3785                 vhost->discovery_threads--;
3786                 del_timer(&tgt->timer);
3787                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3788                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3789         } else
3790                 tgt_dbg(tgt, "Sent ADISC\n");
3791 }
3792
3793 /**
3794  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3795  * @evt:        ibmvfc event struct
3796  *
3797  **/
3798 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3799 {
3800         struct ibmvfc_target *tgt = evt->tgt;
3801         struct ibmvfc_host *vhost = evt->vhost;
3802         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3803         u32 status = be16_to_cpu(rsp->common.status);
3804         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3805
3806         vhost->discovery_threads--;
3807         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3808         switch (status) {
3809         case IBMVFC_MAD_SUCCESS:
3810                 tgt_dbg(tgt, "Query Target succeeded\n");
3811                 tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
3812                 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
3813                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3814                 else
3815                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3816                 break;
3817         case IBMVFC_MAD_DRIVER_FAILED:
3818                 break;
3819         case IBMVFC_MAD_CRQ_ERROR:
3820                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3821                 break;
3822         case IBMVFC_MAD_FAILED:
3823         default:
3824                 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3825                     be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3826                     be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
3827                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3828                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3829                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3830                 else
3831                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3832
3833                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3834                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3835                         rsp->status, rsp->error, ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)),
3836                         rsp->fc_type, ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)),
3837                         rsp->fc_explain, status);
3838                 break;
3839         }
3840
3841         kref_put(&tgt->kref, ibmvfc_release_tgt);
3842         ibmvfc_free_event(evt);
3843         wake_up(&vhost->work_wait_q);
3844 }
3845
3846 /**
3847  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3848  * @tgt:        ibmvfc target struct
3849  *
3850  **/
3851 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3852 {
3853         struct ibmvfc_query_tgt *query_tgt;
3854         struct ibmvfc_host *vhost = tgt->vhost;
3855         struct ibmvfc_event *evt;
3856
3857         if (vhost->discovery_threads >= disc_threads)
3858                 return;
3859
3860         kref_get(&tgt->kref);
3861         evt = ibmvfc_get_event(vhost);
3862         vhost->discovery_threads++;
3863         evt->tgt = tgt;
3864         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3865         query_tgt = &evt->iu.query_tgt;
3866         memset(query_tgt, 0, sizeof(*query_tgt));
3867         query_tgt->common.version = cpu_to_be32(1);
3868         query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
3869         query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
3870         query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
3871
3872         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3873         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3874                 vhost->discovery_threads--;
3875                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3876                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3877         } else
3878                 tgt_dbg(tgt, "Sent Query Target\n");
3879 }
3880
3881 /**
3882  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3883  * @vhost:              ibmvfc host struct
3884  * @scsi_id:    SCSI ID to allocate target for
3885  *
3886  * Returns:
3887  *      0 on success / other on failure
3888  **/
3889 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3890 {
3891         struct ibmvfc_target *tgt;
3892         unsigned long flags;
3893
3894         spin_lock_irqsave(vhost->host->host_lock, flags);
3895         list_for_each_entry(tgt, &vhost->targets, queue) {
3896                 if (tgt->scsi_id == scsi_id) {
3897                         if (tgt->need_login)
3898                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3899                         goto unlock_out;
3900                 }
3901         }
3902         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3903
3904         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3905         memset(tgt, 0, sizeof(*tgt));
3906         tgt->scsi_id = scsi_id;
3907         tgt->new_scsi_id = scsi_id;
3908         tgt->vhost = vhost;
3909         tgt->need_login = 1;
3910         tgt->cancel_key = vhost->task_set++;
3911         timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
3912         kref_init(&tgt->kref);
3913         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3914         spin_lock_irqsave(vhost->host->host_lock, flags);
3915         list_add_tail(&tgt->queue, &vhost->targets);
3916
3917 unlock_out:
3918         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3919         return 0;
3920 }
3921
3922 /**
3923  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3924  * @vhost:              ibmvfc host struct
3925  *
3926  * Returns:
3927  *      0 on success / other on failure
3928  **/
3929 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3930 {
3931         int i, rc;
3932
3933         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3934                 rc = ibmvfc_alloc_target(vhost,
3935                                          be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
3936                                          IBMVFC_DISC_TGT_SCSI_ID_MASK);
3937
3938         return rc;
3939 }
3940
3941 /**
3942  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3943  * @evt:        ibmvfc event struct
3944  *
3945  **/
3946 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3947 {
3948         struct ibmvfc_host *vhost = evt->vhost;
3949         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3950         u32 mad_status = be16_to_cpu(rsp->common.status);
3951         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3952
3953         switch (mad_status) {
3954         case IBMVFC_MAD_SUCCESS:
3955                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3956                 vhost->num_targets = be32_to_cpu(rsp->num_written);
3957                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3958                 break;
3959         case IBMVFC_MAD_FAILED:
3960                 level += ibmvfc_retry_host_init(vhost);
3961                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3962                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3963                            rsp->status, rsp->error);
3964                 break;
3965         case IBMVFC_MAD_DRIVER_FAILED:
3966                 break;
3967         default:
3968                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3969                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3970                 break;
3971         }
3972
3973         ibmvfc_free_event(evt);
3974         wake_up(&vhost->work_wait_q);
3975 }
3976
3977 /**
3978  * ibmvfc_discover_targets - Send Discover Targets MAD
3979  * @vhost:      ibmvfc host struct
3980  *
3981  **/
3982 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3983 {
3984         struct ibmvfc_discover_targets *mad;
3985         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3986
3987         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3988         mad = &evt->iu.discover_targets;
3989         memset(mad, 0, sizeof(*mad));
3990         mad->common.version = cpu_to_be32(1);
3991         mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
3992         mad->common.length = cpu_to_be16(sizeof(*mad));
3993         mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
3994         mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
3995         mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
3996         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3997
3998         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3999                 ibmvfc_dbg(vhost, "Sent discover targets\n");
4000         else
4001                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4002 }
4003
4004 /**
4005  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
4006  * @evt:        ibmvfc event struct
4007  *
4008  **/
4009 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4010 {
4011         struct ibmvfc_host *vhost = evt->vhost;
4012         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
4013         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4014         unsigned int npiv_max_sectors;
4015         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4016
4017         switch (mad_status) {
4018         case IBMVFC_MAD_SUCCESS:
4019                 ibmvfc_free_event(evt);
4020                 break;
4021         case IBMVFC_MAD_FAILED:
4022                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4023                         level += ibmvfc_retry_host_init(vhost);
4024                 else
4025                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4026                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4027                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4028                                                 rsp->status, rsp->error);
4029                 ibmvfc_free_event(evt);
4030                 return;
4031         case IBMVFC_MAD_CRQ_ERROR:
4032                 ibmvfc_retry_host_init(vhost);
4033         case IBMVFC_MAD_DRIVER_FAILED:
4034                 ibmvfc_free_event(evt);
4035                 return;
4036         default:
4037                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4038                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4039                 ibmvfc_free_event(evt);
4040                 return;
4041         }
4042
4043         vhost->client_migrated = 0;
4044
4045         if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
4046                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4047                         rsp->flags);
4048                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4049                 wake_up(&vhost->work_wait_q);
4050                 return;
4051         }
4052
4053         if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
4054                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4055                         rsp->max_cmds);
4056                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4057                 wake_up(&vhost->work_wait_q);
4058                 return;
4059         }
4060
4061         vhost->logged_in = 1;
4062         npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
4063         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4064                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4065                  rsp->drc_name, npiv_max_sectors);
4066
4067         fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
4068         fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
4069         fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
4070         fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
4071         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4072         fc_host_supported_classes(vhost->host) = 0;
4073         if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
4074                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4075         if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
4076                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4077         if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
4078                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4079         fc_host_maxframe_size(vhost->host) =
4080                 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
4081
4082         vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
4083         vhost->host->max_sectors = npiv_max_sectors;
4084         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4085         wake_up(&vhost->work_wait_q);
4086 }
4087
4088 /**
4089  * ibmvfc_npiv_login - Sends NPIV login
4090  * @vhost:      ibmvfc host struct
4091  *
4092  **/
4093 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4094 {
4095         struct ibmvfc_npiv_login_mad *mad;
4096         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4097
4098         ibmvfc_gather_partition_info(vhost);
4099         ibmvfc_set_login_info(vhost);
4100         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4101
4102         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4103         mad = &evt->iu.npiv_login;
4104         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4105         mad->common.version = cpu_to_be32(1);
4106         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
4107         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
4108         mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
4109         mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
4110
4111         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4112
4113         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4114                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4115         else
4116                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4117 };
4118
4119 /**
4120  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4121  * @vhost:              ibmvfc host struct
4122  *
4123  **/
4124 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4125 {
4126         struct ibmvfc_host *vhost = evt->vhost;
4127         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
4128
4129         ibmvfc_free_event(evt);
4130
4131         switch (mad_status) {
4132         case IBMVFC_MAD_SUCCESS:
4133                 if (list_empty(&vhost->sent) &&
4134                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4135                         ibmvfc_init_host(vhost);
4136                         return;
4137                 }
4138                 break;
4139         case IBMVFC_MAD_FAILED:
4140         case IBMVFC_MAD_NOT_SUPPORTED:
4141         case IBMVFC_MAD_CRQ_ERROR:
4142         case IBMVFC_MAD_DRIVER_FAILED:
4143         default:
4144                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4145                 break;
4146         }
4147
4148         ibmvfc_hard_reset_host(vhost);
4149 }
4150
4151 /**
4152  * ibmvfc_npiv_logout - Issue an NPIV Logout
4153  * @vhost:              ibmvfc host struct
4154  *
4155  **/
4156 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4157 {
4158         struct ibmvfc_npiv_logout_mad *mad;
4159         struct ibmvfc_event *evt;
4160
4161         evt = ibmvfc_get_event(vhost);
4162         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4163
4164         mad = &evt->iu.npiv_logout;
4165         memset(mad, 0, sizeof(*mad));
4166         mad->common.version = cpu_to_be32(1);
4167         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
4168         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
4169
4170         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4171
4172         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4173                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4174         else
4175                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4176 }
4177
4178 /**
4179  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4180  * @vhost:              ibmvfc host struct
4181  *
4182  * Returns:
4183  *      1 if work to do / 0 if not
4184  **/
4185 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4186 {
4187         struct ibmvfc_target *tgt;
4188
4189         list_for_each_entry(tgt, &vhost->targets, queue) {
4190                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4191                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4192                         return 1;
4193         }
4194
4195         return 0;
4196 }
4197
4198 /**
4199  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4200  * @vhost:              ibmvfc host struct
4201  *
4202  * Returns:
4203  *      1 if work to do / 0 if not
4204  **/
4205 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4206 {
4207         struct ibmvfc_target *tgt;
4208
4209         if (kthread_should_stop())
4210                 return 1;
4211         switch (vhost->action) {
4212         case IBMVFC_HOST_ACTION_NONE:
4213         case IBMVFC_HOST_ACTION_INIT_WAIT:
4214         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4215                 return 0;
4216         case IBMVFC_HOST_ACTION_TGT_INIT:
4217         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4218                 if (vhost->discovery_threads == disc_threads)
4219                         return 0;
4220                 list_for_each_entry(tgt, &vhost->targets, queue)
4221                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4222                                 return 1;
4223                 list_for_each_entry(tgt, &vhost->targets, queue)
4224                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4225                                 return 0;
4226                 return 1;
4227         case IBMVFC_HOST_ACTION_LOGO:
4228         case IBMVFC_HOST_ACTION_INIT:
4229         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4230         case IBMVFC_HOST_ACTION_TGT_DEL:
4231         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4232         case IBMVFC_HOST_ACTION_QUERY:
4233         case IBMVFC_HOST_ACTION_RESET:
4234         case IBMVFC_HOST_ACTION_REENABLE:
4235         default:
4236                 break;
4237         }
4238
4239         return 1;
4240 }
4241
4242 /**
4243  * ibmvfc_work_to_do - Is there task level work to do?
4244  * @vhost:              ibmvfc host struct
4245  *
4246  * Returns:
4247  *      1 if work to do / 0 if not
4248  **/
4249 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4250 {
4251         unsigned long flags;
4252         int rc;
4253
4254         spin_lock_irqsave(vhost->host->host_lock, flags);
4255         rc = __ibmvfc_work_to_do(vhost);
4256         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4257         return rc;
4258 }
4259
4260 /**
4261  * ibmvfc_log_ae - Log async events if necessary
4262  * @vhost:              ibmvfc host struct
4263  * @events:             events to log
4264  *
4265  **/
4266 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4267 {
4268         if (events & IBMVFC_AE_RSCN)
4269                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4270         if ((events & IBMVFC_AE_LINKDOWN) &&
4271             vhost->state >= IBMVFC_HALTED)
4272                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4273         if ((events & IBMVFC_AE_LINKUP) &&
4274             vhost->state == IBMVFC_INITIALIZING)
4275                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4276 }
4277
4278 /**
4279  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4280  * @tgt:                ibmvfc target struct
4281  *
4282  **/
4283 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4284 {
4285         struct ibmvfc_host *vhost = tgt->vhost;
4286         struct fc_rport *rport;
4287         unsigned long flags;
4288
4289         tgt_dbg(tgt, "Adding rport\n");
4290         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4291         spin_lock_irqsave(vhost->host->host_lock, flags);
4292
4293         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4294                 tgt_dbg(tgt, "Deleting rport\n");
4295                 list_del(&tgt->queue);
4296                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4297                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4298                 fc_remote_port_delete(rport);
4299                 del_timer_sync(&tgt->timer);
4300                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4301                 return;
4302         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4303                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4304                 return;
4305         }
4306
4307         if (rport) {
4308                 tgt_dbg(tgt, "rport add succeeded\n");
4309                 tgt->rport = rport;
4310                 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
4311                 rport->supported_classes = 0;
4312                 tgt->target_id = rport->scsi_target_id;
4313                 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
4314                         rport->supported_classes |= FC_COS_CLASS1;
4315                 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
4316                         rport->supported_classes |= FC_COS_CLASS2;
4317                 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
4318                         rport->supported_classes |= FC_COS_CLASS3;
4319                 if (rport->rqst_q)
4320                         blk_queue_max_segments(rport->rqst_q, 1);
4321         } else
4322                 tgt_dbg(tgt, "rport add failed\n");
4323         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4324 }
4325
4326 /**
4327  * ibmvfc_do_work - Do task level work
4328  * @vhost:              ibmvfc host struct
4329  *
4330  **/
4331 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4332 {
4333         struct ibmvfc_target *tgt;
4334         unsigned long flags;
4335         struct fc_rport *rport;
4336         int rc;
4337
4338         ibmvfc_log_ae(vhost, vhost->events_to_log);
4339         spin_lock_irqsave(vhost->host->host_lock, flags);
4340         vhost->events_to_log = 0;
4341         switch (vhost->action) {
4342         case IBMVFC_HOST_ACTION_NONE:
4343         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4344         case IBMVFC_HOST_ACTION_INIT_WAIT:
4345                 break;
4346         case IBMVFC_HOST_ACTION_RESET:
4347                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4348                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4349                 rc = ibmvfc_reset_crq(vhost);
4350                 spin_lock_irqsave(vhost->host->host_lock, flags);
4351                 if (rc == H_CLOSED)
4352                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4353                 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4354                     (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4355                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4356                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4357                 }
4358                 break;
4359         case IBMVFC_HOST_ACTION_REENABLE:
4360                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4361                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4362                 rc = ibmvfc_reenable_crq_queue(vhost);
4363                 spin_lock_irqsave(vhost->host->host_lock, flags);
4364                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4365                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4366                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4367                 }
4368                 break;
4369         case IBMVFC_HOST_ACTION_LOGO:
4370                 vhost->job_step(vhost);
4371                 break;
4372         case IBMVFC_HOST_ACTION_INIT:
4373                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4374                 if (vhost->delay_init) {
4375                         vhost->delay_init = 0;
4376                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4377                         ssleep(15);
4378                         return;
4379                 } else
4380                         vhost->job_step(vhost);
4381                 break;
4382         case IBMVFC_HOST_ACTION_QUERY:
4383                 list_for_each_entry(tgt, &vhost->targets, queue)
4384                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4385                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4386                 break;
4387         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4388                 list_for_each_entry(tgt, &vhost->targets, queue) {
4389                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4390                                 tgt->job_step(tgt);
4391                                 break;
4392                         }
4393                 }
4394
4395                 if (!ibmvfc_dev_init_to_do(vhost))
4396                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4397                 break;
4398         case IBMVFC_HOST_ACTION_TGT_DEL:
4399         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4400                 list_for_each_entry(tgt, &vhost->targets, queue) {
4401                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4402                                 tgt_dbg(tgt, "Deleting rport\n");
4403                                 rport = tgt->rport;
4404                                 tgt->rport = NULL;
4405                                 list_del(&tgt->queue);
4406                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4407                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4408                                 if (rport)
4409                                         fc_remote_port_delete(rport);
4410                                 del_timer_sync(&tgt->timer);
4411                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4412                                 return;
4413                         }
4414                 }
4415
4416                 if (vhost->state == IBMVFC_INITIALIZING) {
4417                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4418                                 if (vhost->reinit) {
4419                                         vhost->reinit = 0;
4420                                         scsi_block_requests(vhost->host);
4421                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4422                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4423                                 } else {
4424                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4425                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4426                                         wake_up(&vhost->init_wait_q);
4427                                         schedule_work(&vhost->rport_add_work_q);
4428                                         vhost->init_retries = 0;
4429                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4430                                         scsi_unblock_requests(vhost->host);
4431                                 }
4432
4433                                 return;
4434                         } else {
4435                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4436                                 vhost->job_step = ibmvfc_discover_targets;
4437                         }
4438                 } else {
4439                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4440                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4441                         scsi_unblock_requests(vhost->host);
4442                         wake_up(&vhost->init_wait_q);
4443                         return;
4444                 }
4445                 break;
4446         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4447                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4448                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4449                 ibmvfc_alloc_targets(vhost);
4450                 spin_lock_irqsave(vhost->host->host_lock, flags);
4451                 break;
4452         case IBMVFC_HOST_ACTION_TGT_INIT:
4453                 list_for_each_entry(tgt, &vhost->targets, queue) {
4454                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4455                                 tgt->job_step(tgt);
4456                                 break;
4457                         }
4458                 }
4459
4460                 if (!ibmvfc_dev_init_to_do(vhost))
4461                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4462                 break;
4463         default:
4464                 break;
4465         }
4466
4467         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4468 }
4469
4470 /**
4471  * ibmvfc_work - Do task level work
4472  * @data:               ibmvfc host struct
4473  *
4474  * Returns:
4475  *      zero
4476  **/
4477 static int ibmvfc_work(void *data)
4478 {
4479         struct ibmvfc_host *vhost = data;
4480         int rc;
4481
4482         set_user_nice(current, MIN_NICE);
4483
4484         while (1) {
4485                 rc = wait_event_interruptible(vhost->work_wait_q,
4486                                               ibmvfc_work_to_do(vhost));
4487
4488                 BUG_ON(rc);
4489
4490                 if (kthread_should_stop())
4491                         break;
4492
4493                 ibmvfc_do_work(vhost);
4494         }
4495
4496         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4497         return 0;
4498 }
4499
4500 /**
4501  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4502  * @vhost:      ibmvfc host struct
4503  *
4504  * Allocates a page for messages, maps it for dma, and registers
4505  * the crq with the hypervisor.
4506  *
4507  * Return value:
4508  *      zero on success / other on failure
4509  **/
4510 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4511 {
4512         int rc, retrc = -ENOMEM;
4513         struct device *dev = vhost->dev;
4514         struct vio_dev *vdev = to_vio_dev(dev);
4515         struct ibmvfc_crq_queue *crq = &vhost->crq;
4516
4517         ENTER;
4518         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4519
4520         if (!crq->msgs)
4521                 return -ENOMEM;
4522
4523         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4524         crq->msg_token = dma_map_single(dev, crq->msgs,
4525                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4526
4527         if (dma_mapping_error(dev, crq->msg_token))
4528                 goto map_failed;
4529
4530         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4531                                         crq->msg_token, PAGE_SIZE);
4532
4533         if (rc == H_RESOURCE)
4534                 /* maybe kexecing and resource is busy. try a reset */
4535                 retrc = rc = ibmvfc_reset_crq(vhost);
4536
4537         if (rc == H_CLOSED)
4538                 dev_warn(dev, "Partner adapter not ready\n");
4539         else if (rc) {
4540                 dev_warn(dev, "Error %d opening adapter\n", rc);
4541                 goto reg_crq_failed;
4542         }
4543
4544         retrc = 0;
4545
4546         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4547
4548         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4549                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4550                 goto req_irq_failed;
4551         }
4552
4553         if ((rc = vio_enable_interrupts(vdev))) {
4554                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4555                 goto req_irq_failed;
4556         }
4557
4558         crq->cur = 0;
4559         LEAVE;
4560         return retrc;
4561
4562 req_irq_failed:
4563         tasklet_kill(&vhost->tasklet);
4564         do {
4565                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4566         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4567 reg_crq_failed:
4568         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4569 map_failed:
4570         free_page((unsigned long)crq->msgs);
4571         return retrc;
4572 }
4573
4574 /**
4575  * ibmvfc_free_mem - Free memory for vhost
4576  * @vhost:      ibmvfc host struct
4577  *
4578  * Return value:
4579  *      none
4580  **/
4581 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4582 {
4583         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4584
4585         ENTER;
4586         mempool_destroy(vhost->tgt_pool);
4587         kfree(vhost->trace);
4588         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4589                           vhost->disc_buf_dma);
4590         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4591                           vhost->login_buf, vhost->login_buf_dma);
4592         dma_pool_destroy(vhost->sg_pool);
4593         dma_unmap_single(vhost->dev, async_q->msg_token,
4594                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4595         free_page((unsigned long)async_q->msgs);
4596         LEAVE;
4597 }
4598
4599 /**
4600  * ibmvfc_alloc_mem - Allocate memory for vhost
4601  * @vhost:      ibmvfc host struct
4602  *
4603  * Return value:
4604  *      0 on success / non-zero on failure
4605  **/
4606 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4607 {
4608         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4609         struct device *dev = vhost->dev;
4610
4611         ENTER;
4612         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4613         if (!async_q->msgs) {
4614                 dev_err(dev, "Couldn't allocate async queue.\n");
4615                 goto nomem;
4616         }
4617
4618         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4619         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4620                                             async_q->size * sizeof(*async_q->msgs),
4621                                             DMA_BIDIRECTIONAL);
4622
4623         if (dma_mapping_error(dev, async_q->msg_token)) {
4624                 dev_err(dev, "Failed to map async queue\n");
4625                 goto free_async_crq;
4626         }
4627
4628         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4629                                          SG_ALL * sizeof(struct srp_direct_buf),
4630                                          sizeof(struct srp_direct_buf), 0);
4631
4632         if (!vhost->sg_pool) {
4633                 dev_err(dev, "Failed to allocate sg pool\n");
4634                 goto unmap_async_crq;
4635         }
4636
4637         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4638                                               &vhost->login_buf_dma, GFP_KERNEL);
4639
4640         if (!vhost->login_buf) {
4641                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4642                 goto free_sg_pool;
4643         }
4644
4645         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4646         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4647                                              &vhost->disc_buf_dma, GFP_KERNEL);
4648
4649         if (!vhost->disc_buf) {
4650                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4651                 goto free_login_buffer;
4652         }
4653
4654         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4655                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4656
4657         if (!vhost->trace)
4658                 goto free_disc_buffer;
4659
4660         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4661                                                       sizeof(struct ibmvfc_target));
4662
4663         if (!vhost->tgt_pool) {
4664                 dev_err(dev, "Couldn't allocate target memory pool\n");
4665                 goto free_trace;
4666         }
4667
4668         LEAVE;
4669         return 0;
4670
4671 free_trace:
4672         kfree(vhost->trace);
4673 free_disc_buffer:
4674         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4675                           vhost->disc_buf_dma);
4676 free_login_buffer:
4677         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4678                           vhost->login_buf, vhost->login_buf_dma);
4679 free_sg_pool:
4680         dma_pool_destroy(vhost->sg_pool);
4681 unmap_async_crq:
4682         dma_unmap_single(dev, async_q->msg_token,
4683                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4684 free_async_crq:
4685         free_page((unsigned long)async_q->msgs);
4686 nomem:
4687         LEAVE;
4688         return -ENOMEM;
4689 }
4690
4691 /**
4692  * ibmvfc_rport_add_thread - Worker thread for rport adds
4693  * @work:       work struct
4694  *
4695  **/
4696 static void ibmvfc_rport_add_thread(struct work_struct *work)
4697 {
4698         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4699                                                  rport_add_work_q);
4700         struct ibmvfc_target *tgt;
4701         struct fc_rport *rport;
4702         unsigned long flags;
4703         int did_work;
4704
4705         ENTER;
4706         spin_lock_irqsave(vhost->host->host_lock, flags);
4707         do {
4708                 did_work = 0;
4709                 if (vhost->state != IBMVFC_ACTIVE)
4710                         break;
4711
4712                 list_for_each_entry(tgt, &vhost->targets, queue) {
4713                         if (tgt->add_rport) {
4714                                 did_work = 1;
4715                                 tgt->add_rport = 0;
4716                                 kref_get(&tgt->kref);
4717                                 rport = tgt->rport;
4718                                 if (!rport) {
4719                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4720                                         ibmvfc_tgt_add_rport(tgt);
4721                                 } else if (get_device(&rport->dev)) {
4722                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4723                                         tgt_dbg(tgt, "Setting rport roles\n");
4724                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4725                                         put_device(&rport->dev);
4726                                 } else {
4727                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4728                                 }
4729
4730                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4731                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4732                                 break;
4733                         }
4734                 }
4735         } while(did_work);
4736
4737         if (vhost->state == IBMVFC_ACTIVE)
4738                 vhost->scan_complete = 1;
4739         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4740         LEAVE;
4741 }
4742
4743 /**
4744  * ibmvfc_probe - Adapter hot plug add entry point
4745  * @vdev:       vio device struct
4746  * @id: vio device id struct
4747  *
4748  * Return value:
4749  *      0 on success / non-zero on failure
4750  **/
4751 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4752 {
4753         struct ibmvfc_host *vhost;
4754         struct Scsi_Host *shost;
4755         struct device *dev = &vdev->dev;
4756         int rc = -ENOMEM;
4757
4758         ENTER;
4759         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4760         if (!shost) {
4761                 dev_err(dev, "Couldn't allocate host data\n");
4762                 goto out;
4763         }
4764
4765         shost->transportt = ibmvfc_transport_template;
4766         shost->can_queue = max_requests;
4767         shost->max_lun = max_lun;
4768         shost->max_id = max_targets;
4769         shost->max_sectors = IBMVFC_MAX_SECTORS;
4770         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4771         shost->unique_id = shost->host_no;
4772
4773         vhost = shost_priv(shost);
4774         INIT_LIST_HEAD(&vhost->sent);
4775         INIT_LIST_HEAD(&vhost->free);
4776         INIT_LIST_HEAD(&vhost->targets);
4777         sprintf(vhost->name, IBMVFC_NAME);
4778         vhost->host = shost;
4779         vhost->dev = dev;
4780         vhost->partition_number = -1;
4781         vhost->log_level = log_level;
4782         vhost->task_set = 1;
4783         strcpy(vhost->partition_name, "UNKNOWN");
4784         init_waitqueue_head(&vhost->work_wait_q);
4785         init_waitqueue_head(&vhost->init_wait_q);
4786         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4787         mutex_init(&vhost->passthru_mutex);
4788
4789         if ((rc = ibmvfc_alloc_mem(vhost)))
4790                 goto free_scsi_host;
4791
4792         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4793                                          shost->host_no);
4794
4795         if (IS_ERR(vhost->work_thread)) {
4796                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4797                         PTR_ERR(vhost->work_thread));
4798                 goto free_host_mem;
4799         }
4800
4801         if ((rc = ibmvfc_init_crq(vhost))) {
4802                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4803                 goto kill_kthread;
4804         }
4805
4806         if ((rc = ibmvfc_init_event_pool(vhost))) {
4807                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4808                 goto release_crq;
4809         }
4810
4811         if ((rc = scsi_add_host(shost, dev)))
4812                 goto release_event_pool;
4813
4814         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4815
4816         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4817                                            &ibmvfc_trace_attr))) {
4818                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4819                 goto remove_shost;
4820         }
4821
4822         if (shost_to_fc_host(shost)->rqst_q)
4823                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4824         dev_set_drvdata(dev, vhost);
4825         spin_lock(&ibmvfc_driver_lock);
4826         list_add_tail(&vhost->queue, &ibmvfc_head);
4827         spin_unlock(&ibmvfc_driver_lock);
4828
4829         ibmvfc_send_crq_init(vhost);
4830         scsi_scan_host(shost);
4831         return 0;
4832
4833 remove_shost:
4834         scsi_remove_host(shost);
4835 release_event_pool:
4836         ibmvfc_free_event_pool(vhost);
4837 release_crq:
4838         ibmvfc_release_crq_queue(vhost);
4839 kill_kthread:
4840         kthread_stop(vhost->work_thread);
4841 free_host_mem:
4842         ibmvfc_free_mem(vhost);
4843 free_scsi_host:
4844         scsi_host_put(shost);
4845 out:
4846         LEAVE;
4847         return rc;
4848 }
4849
4850 /**
4851  * ibmvfc_remove - Adapter hot plug remove entry point
4852  * @vdev:       vio device struct
4853  *
4854  * Return value:
4855  *      0
4856  **/
4857 static int ibmvfc_remove(struct vio_dev *vdev)
4858 {
4859         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4860         unsigned long flags;
4861
4862         ENTER;
4863         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4864
4865         spin_lock_irqsave(vhost->host->host_lock, flags);
4866         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4867         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4868
4869         ibmvfc_wait_while_resetting(vhost);
4870         ibmvfc_release_crq_queue(vhost);
4871         kthread_stop(vhost->work_thread);
4872         fc_remove_host(vhost->host);
4873         scsi_remove_host(vhost->host);
4874
4875         spin_lock_irqsave(vhost->host->host_lock, flags);
4876         ibmvfc_purge_requests(vhost, DID_ERROR);
4877         ibmvfc_free_event_pool(vhost);
4878         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4879
4880         ibmvfc_free_mem(vhost);
4881         spin_lock(&ibmvfc_driver_lock);
4882         list_del(&vhost->queue);
4883         spin_unlock(&ibmvfc_driver_lock);
4884         scsi_host_put(vhost->host);
4885         LEAVE;
4886         return 0;
4887 }
4888
4889 /**
4890  * ibmvfc_resume - Resume from suspend
4891  * @dev:        device struct
4892  *
4893  * We may have lost an interrupt across suspend/resume, so kick the
4894  * interrupt handler
4895  *
4896  */
4897 static int ibmvfc_resume(struct device *dev)
4898 {
4899         unsigned long flags;
4900         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4901         struct vio_dev *vdev = to_vio_dev(dev);
4902
4903         spin_lock_irqsave(vhost->host->host_lock, flags);
4904         vio_disable_interrupts(vdev);
4905         tasklet_schedule(&vhost->tasklet);
4906         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4907         return 0;
4908 }
4909
4910 /**
4911  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4912  * @vdev:       vio device struct
4913  *
4914  * Return value:
4915  *      Number of bytes the driver will need to DMA map at the same time in
4916  *      order to perform well.
4917  */
4918 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4919 {
4920         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4921         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4922 }
4923
4924 static const struct vio_device_id ibmvfc_device_table[] = {
4925         {"fcp", "IBM,vfc-client"},
4926         { "", "" }
4927 };
4928 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4929
4930 static const struct dev_pm_ops ibmvfc_pm_ops = {
4931         .resume = ibmvfc_resume
4932 };
4933
4934 static struct vio_driver ibmvfc_driver = {
4935         .id_table = ibmvfc_device_table,
4936         .probe = ibmvfc_probe,
4937         .remove = ibmvfc_remove,
4938         .get_desired_dma = ibmvfc_get_desired_dma,
4939         .name = IBMVFC_NAME,
4940         .pm = &ibmvfc_pm_ops,
4941 };
4942
4943 static struct fc_function_template ibmvfc_transport_functions = {
4944         .show_host_fabric_name = 1,
4945         .show_host_node_name = 1,
4946         .show_host_port_name = 1,
4947         .show_host_supported_classes = 1,
4948         .show_host_port_type = 1,
4949         .show_host_port_id = 1,
4950         .show_host_maxframe_size = 1,
4951
4952         .get_host_port_state = ibmvfc_get_host_port_state,
4953         .show_host_port_state = 1,
4954
4955         .get_host_speed = ibmvfc_get_host_speed,
4956         .show_host_speed = 1,
4957
4958         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4959         .terminate_rport_io = ibmvfc_terminate_rport_io,
4960
4961         .show_rport_maxframe_size = 1,
4962         .show_rport_supported_classes = 1,
4963
4964         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4965         .show_rport_dev_loss_tmo = 1,
4966
4967         .get_starget_node_name = ibmvfc_get_starget_node_name,
4968         .show_starget_node_name = 1,
4969
4970         .get_starget_port_name = ibmvfc_get_starget_port_name,
4971         .show_starget_port_name = 1,
4972
4973         .get_starget_port_id = ibmvfc_get_starget_port_id,
4974         .show_starget_port_id = 1,
4975
4976         .bsg_request = ibmvfc_bsg_request,
4977         .bsg_timeout = ibmvfc_bsg_timeout,
4978 };
4979
4980 /**
4981  * ibmvfc_module_init - Initialize the ibmvfc module
4982  *
4983  * Return value:
4984  *      0 on success / other on failure
4985  **/
4986 static int __init ibmvfc_module_init(void)
4987 {
4988         int rc;
4989
4990         if (!firmware_has_feature(FW_FEATURE_VIO))
4991                 return -ENODEV;
4992
4993         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4994                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4995
4996         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4997         if (!ibmvfc_transport_template)
4998                 return -ENOMEM;
4999
5000         rc = vio_register_driver(&ibmvfc_driver);
5001         if (rc)
5002                 fc_release_transport(ibmvfc_transport_template);
5003         return rc;
5004 }
5005
5006 /**
5007  * ibmvfc_module_exit - Teardown the ibmvfc module
5008  *
5009  * Return value:
5010  *      nothing
5011  **/
5012 static void __exit ibmvfc_module_exit(void)
5013 {
5014         vio_unregister_driver(&ibmvfc_driver);
5015         fc_release_transport(ibmvfc_transport_template);
5016 }
5017
5018 module_init(ibmvfc_module_init);
5019 module_exit(ibmvfc_module_exit);