Pileus Git - ~andy/linux/blob - drivers/scsi/ibmvscsi/ibmvfc.c

   1 /*
   2  * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
   3  *
   4  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
   5  *
   6  * Copyright (C) IBM Corporation, 2008
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/dmapool.h>
  28 #include <linux/delay.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/kthread.h>
  31 #include <linux/slab.h>
  32 #include <linux/of.h>
  33 #include <linux/pm.h>
  34 #include <linux/stringify.h>
  35 #include <asm/firmware.h>
  36 #include <asm/irq.h>
  37 #include <asm/vio.h>
  38 #include <scsi/scsi.h>
  39 #include <scsi/scsi_cmnd.h>
  40 #include <scsi/scsi_host.h>
  41 #include <scsi/scsi_device.h>
  42 #include <scsi/scsi_tcq.h>
  43 #include <scsi/scsi_transport_fc.h>
  44 #include <scsi/scsi_bsg_fc.h>
  45 #include "ibmvfc.h"
  46
  47 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  48 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  49 static unsigned int max_lun = IBMVFC_MAX_LUN;
  50 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  51 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  52 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  53 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  54 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  55 static LIST_HEAD(ibmvfc_head);
  56 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  57 static struct scsi_transport_template *ibmvfc_transport_template;
  58
  59 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  60 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  61 MODULE_LICENSE("GPL");
  62 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  63
  64 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  65 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  66                  "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  67 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  68 MODULE_PARM_DESC(default_timeout,
  69                  "Default timeout in seconds for initialization and EH commands. "
  70                  "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  71 module_param_named(max_requests, max_requests, uint, S_IRUGO);
  72 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  73                  "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  74 module_param_named(max_lun, max_lun, uint, S_IRUGO);
  75 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  76                  "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  77 module_param_named(max_targets, max_targets, uint, S_IRUGO);
  78 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  79                  "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  80 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
  81 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
  82                  "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
  83 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
  84 MODULE_PARM_DESC(debug, "Enable driver debug information. "
  85                  "[Default=" __stringify(IBMVFC_DEBUG) "]");
  86 module_param_named(log_level, log_level, uint, 0);
  87 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
  88                  "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
  89
  90 static const struct {
  91         u16 status;
  92         u16 error;
  93         u8 result;
  94         u8 retry;
  95         int log;
  96         char *name;
  97 } cmd_status [] = {
  98         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
  99         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
 100         { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
 101         { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
 102         { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
 103         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
 104         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
 105         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
 106         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
 107         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
 108         { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 109         { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 110         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 111         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 112
 113         { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 114         { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 115         { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 116         { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 117         { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 118         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 119         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 120         { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 121         { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 122         { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 123
 124         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 125         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 126         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 127         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 128         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 129         { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 130         { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 131         { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 132         { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 133         { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 134         { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 135
 136         { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 137 };
 138
 139 static void ibmvfc_npiv_login(struct ibmvfc_host *);
 140 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 141 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 142 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 143 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 144
 145 static const char *unknown_error = "unknown error";
 146
 147 #ifdef CONFIG_SCSI_IBMVFC_TRACE
 148 /**
 149  * ibmvfc_trc_start - Log a start trace entry
 150  * @evt:                ibmvfc event struct
 151  *
 152  **/
 153 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 154 {
 155         struct ibmvfc_host *vhost = evt->vhost;
 156         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 157         struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 158         struct ibmvfc_trace_entry *entry;
 159
 160         entry = &vhost->trace[vhost->trace_index++];
 161         entry->evt = evt;
 162         entry->time = jiffies;
 163         entry->fmt = evt->crq.format;
 164         entry->type = IBMVFC_TRC_START;
 165
 166         switch (entry->fmt) {
 167         case IBMVFC_CMD_FORMAT:
 168                 entry->op_code = vfc_cmd->iu.cdb[0];
 169                 entry->scsi_id = vfc_cmd->tgt_scsi_id;
 170                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 171                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 172                 entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
 173                 break;
 174         case IBMVFC_MAD_FORMAT:
 175                 entry->op_code = mad->opcode;
 176                 break;
 177         default:
 178                 break;
 179         };
 180 }
 181
 182 /**
 183  * ibmvfc_trc_end - Log an end trace entry
 184  * @evt:                ibmvfc event struct
 185  *
 186  **/
 187 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 188 {
 189         struct ibmvfc_host *vhost = evt->vhost;
 190         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 191         struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 192         struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
 193
 194         entry->evt = evt;
 195         entry->time = jiffies;
 196         entry->fmt = evt->crq.format;
 197         entry->type = IBMVFC_TRC_END;
 198
 199         switch (entry->fmt) {
 200         case IBMVFC_CMD_FORMAT:
 201                 entry->op_code = vfc_cmd->iu.cdb[0];
 202                 entry->scsi_id = vfc_cmd->tgt_scsi_id;
 203                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 204                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 205                 entry->u.end.status = vfc_cmd->status;
 206                 entry->u.end.error = vfc_cmd->error;
 207                 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
 208                 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
 209                 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
 210                 break;
 211         case IBMVFC_MAD_FORMAT:
 212                 entry->op_code = mad->opcode;
 213                 entry->u.end.status = mad->status;
 214                 break;
 215         default:
 216                 break;
 217
 218         };
 219 }
 220
 221 #else
 222 #define ibmvfc_trc_start(evt) do { } while (0)
 223 #define ibmvfc_trc_end(evt) do { } while (0)
 224 #endif
 225
 226 /**
 227  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 228  * @status:             status / error class
 229  * @error:              error
 230  *
 231  * Return value:
 232  *      index into cmd_status / -EINVAL on failure
 233  **/
 234 static int ibmvfc_get_err_index(u16 status, u16 error)
 235 {
 236         int i;
 237
 238         for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 239                 if ((cmd_status[i].status & status) == cmd_status[i].status &&
 240                     cmd_status[i].error == error)
 241                         return i;
 242
 243         return -EINVAL;
 244 }
 245
 246 /**
 247  * ibmvfc_get_cmd_error - Find the error description for the fcp response
 248  * @status:             status / error class
 249  * @error:              error
 250  *
 251  * Return value:
 252  *      error description string
 253  **/
 254 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 255 {
 256         int rc = ibmvfc_get_err_index(status, error);
 257         if (rc >= 0)
 258                 return cmd_status[rc].name;
 259         return unknown_error;
 260 }
 261
 262 /**
 263  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 264  * @vfc_cmd:    ibmvfc command struct
 265  *
 266  * Return value:
 267  *      SCSI result value to return for completed command
 268  **/
 269 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
 270 {
 271         int err;
 272         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
 273         int fc_rsp_len = rsp->fcp_rsp_len;
 274
 275         if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 276             ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 277              rsp->data.info.rsp_code))
 278                 return DID_ERROR << 16;
 279
 280         err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
 281         if (err >= 0)
 282                 return rsp->scsi_status | (cmd_status[err].result << 16);
 283         return rsp->scsi_status | (DID_ERROR << 16);
 284 }
 285
 286 /**
 287  * ibmvfc_retry_cmd - Determine if error status is retryable
 288  * @status:             status / error class
 289  * @error:              error
 290  *
 291  * Return value:
 292  *      1 if error should be retried / 0 if it should not
 293  **/
 294 static int ibmvfc_retry_cmd(u16 status, u16 error)
 295 {
 296         int rc = ibmvfc_get_err_index(status, error);
 297
 298         if (rc >= 0)
 299                 return cmd_status[rc].retry;
 300         return 1;
 301 }
 302
 303 static const char *unknown_fc_explain = "unknown fc explain";
 304
 305 static const struct {
 306         u16 fc_explain;
 307         char *name;
 308 } ls_explain [] = {
 309         { 0x00, "no additional explanation" },
 310         { 0x01, "service parameter error - options" },
 311         { 0x03, "service parameter error - initiator control" },
 312         { 0x05, "service parameter error - recipient control" },
 313         { 0x07, "service parameter error - received data field size" },
 314         { 0x09, "service parameter error - concurrent seq" },
 315         { 0x0B, "service parameter error - credit" },
 316         { 0x0D, "invalid N_Port/F_Port_Name" },
 317         { 0x0E, "invalid node/Fabric Name" },
 318         { 0x0F, "invalid common service parameters" },
 319         { 0x11, "invalid association header" },
 320         { 0x13, "association header required" },
 321         { 0x15, "invalid originator S_ID" },
 322         { 0x17, "invalid OX_ID-RX-ID combination" },
 323         { 0x19, "command (request) already in progress" },
 324         { 0x1E, "N_Port Login requested" },
 325         { 0x1F, "Invalid N_Port_ID" },
 326 };
 327
 328 static const struct {
 329         u16 fc_explain;
 330         char *name;
 331 } gs_explain [] = {
 332         { 0x00, "no additional explanation" },
 333         { 0x01, "port identifier not registered" },
 334         { 0x02, "port name not registered" },
 335         { 0x03, "node name not registered" },
 336         { 0x04, "class of service not registered" },
 337         { 0x06, "initial process associator not registered" },
 338         { 0x07, "FC-4 TYPEs not registered" },
 339         { 0x08, "symbolic port name not registered" },
 340         { 0x09, "symbolic node name not registered" },
 341         { 0x0A, "port type not registered" },
 342         { 0xF0, "authorization exception" },
 343         { 0xF1, "authentication exception" },
 344         { 0xF2, "data base full" },
 345         { 0xF3, "data base empty" },
 346         { 0xF4, "processing request" },
 347         { 0xF5, "unable to verify connection" },
 348         { 0xF6, "devices not in a common zone" },
 349 };
 350
 351 /**
 352  * ibmvfc_get_ls_explain - Return the FC Explain description text
 353  * @status:     FC Explain status
 354  *
 355  * Returns:
 356  *      error string
 357  **/
 358 static const char *ibmvfc_get_ls_explain(u16 status)
 359 {
 360         int i;
 361
 362         for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 363                 if (ls_explain[i].fc_explain == status)
 364                         return ls_explain[i].name;
 365
 366         return unknown_fc_explain;
 367 }
 368
 369 /**
 370  * ibmvfc_get_gs_explain - Return the FC Explain description text
 371  * @status:     FC Explain status
 372  *
 373  * Returns:
 374  *      error string
 375  **/
 376 static const char *ibmvfc_get_gs_explain(u16 status)
 377 {
 378         int i;
 379
 380         for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 381                 if (gs_explain[i].fc_explain == status)
 382                         return gs_explain[i].name;
 383
 384         return unknown_fc_explain;
 385 }
 386
 387 static const struct {
 388         enum ibmvfc_fc_type fc_type;
 389         char *name;
 390 } fc_type [] = {
 391         { IBMVFC_FABRIC_REJECT, "fabric reject" },
 392         { IBMVFC_PORT_REJECT, "port reject" },
 393         { IBMVFC_LS_REJECT, "ELS reject" },
 394         { IBMVFC_FABRIC_BUSY, "fabric busy" },
 395         { IBMVFC_PORT_BUSY, "port busy" },
 396         { IBMVFC_BASIC_REJECT, "basic reject" },
 397 };
 398
 399 static const char *unknown_fc_type = "unknown fc type";
 400
 401 /**
 402  * ibmvfc_get_fc_type - Return the FC Type description text
 403  * @status:     FC Type error status
 404  *
 405  * Returns:
 406  *      error string
 407  **/
 408 static const char *ibmvfc_get_fc_type(u16 status)
 409 {
 410         int i;
 411
 412         for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 413                 if (fc_type[i].fc_type == status)
 414                         return fc_type[i].name;
 415
 416         return unknown_fc_type;
 417 }
 418
 419 /**
 420  * ibmvfc_set_tgt_action - Set the next init action for the target
 421  * @tgt:                ibmvfc target struct
 422  * @action:             action to perform
 423  *
 424  **/
 425 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 426                                   enum ibmvfc_target_action action)
 427 {
 428         switch (tgt->action) {
 429         case IBMVFC_TGT_ACTION_DEL_RPORT:
 430                 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
 431                         tgt->action = action;
 432         case IBMVFC_TGT_ACTION_DELETED_RPORT:
 433                 break;
 434         default:
 435                 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
 436                         tgt->add_rport = 0;
 437                 tgt->action = action;
 438                 break;
 439         }
 440 }
 441
 442 /**
 443  * ibmvfc_set_host_state - Set the state for the host
 444  * @vhost:              ibmvfc host struct
 445  * @state:              state to set host to
 446  *
 447  * Returns:
 448  *      0 if state changed / non-zero if not changed
 449  **/
 450 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
 451                                   enum ibmvfc_host_state state)
 452 {
 453         int rc = 0;
 454
 455         switch (vhost->state) {
 456         case IBMVFC_HOST_OFFLINE:
 457                 rc = -EINVAL;
 458                 break;
 459         default:
 460                 vhost->state = state;
 461                 break;
 462         };
 463
 464         return rc;
 465 }
 466
 467 /**
 468  * ibmvfc_set_host_action - Set the next init action for the host
 469  * @vhost:              ibmvfc host struct
 470  * @action:             action to perform
 471  *
 472  **/
 473 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 474                                    enum ibmvfc_host_action action)
 475 {
 476         switch (action) {
 477         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 478                 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
 479                         vhost->action = action;
 480                 break;
 481         case IBMVFC_HOST_ACTION_LOGO_WAIT:
 482                 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
 483                         vhost->action = action;
 484                 break;
 485         case IBMVFC_HOST_ACTION_INIT_WAIT:
 486                 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
 487                         vhost->action = action;
 488                 break;
 489         case IBMVFC_HOST_ACTION_QUERY:
 490                 switch (vhost->action) {
 491                 case IBMVFC_HOST_ACTION_INIT_WAIT:
 492                 case IBMVFC_HOST_ACTION_NONE:
 493                 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 494                         vhost->action = action;
 495                         break;
 496                 default:
 497                         break;
 498                 };
 499                 break;
 500         case IBMVFC_HOST_ACTION_TGT_INIT:
 501                 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 502                         vhost->action = action;
 503                 break;
 504         case IBMVFC_HOST_ACTION_INIT:
 505         case IBMVFC_HOST_ACTION_TGT_DEL:
 506                 switch (vhost->action) {
 507                 case IBMVFC_HOST_ACTION_RESET:
 508                 case IBMVFC_HOST_ACTION_REENABLE:
 509                         break;
 510                 default:
 511                         vhost->action = action;
 512                         break;
 513                 };
 514                 break;
 515         case IBMVFC_HOST_ACTION_LOGO:
 516         case IBMVFC_HOST_ACTION_QUERY_TGTS:
 517         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 518         case IBMVFC_HOST_ACTION_NONE:
 519         case IBMVFC_HOST_ACTION_RESET:
 520         case IBMVFC_HOST_ACTION_REENABLE:
 521         default:
 522                 vhost->action = action;
 523                 break;
 524         };
 525 }
 526
 527 /**
 528  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 529  * @vhost:              ibmvfc host struct
 530  *
 531  * Return value:
 532  *      nothing
 533  **/
 534 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 535 {
 536         if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
 537                 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 538                         scsi_block_requests(vhost->host);
 539                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 540                 }
 541         } else
 542                 vhost->reinit = 1;
 543
 544         wake_up(&vhost->work_wait_q);
 545 }
 546
 547 /**
 548  * ibmvfc_link_down - Handle a link down event from the adapter
 549  * @vhost:      ibmvfc host struct
 550  * @state:      ibmvfc host state to enter
 551  *
 552  **/
 553 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 554                              enum ibmvfc_host_state state)
 555 {
 556         struct ibmvfc_target *tgt;
 557
 558         ENTER;
 559         scsi_block_requests(vhost->host);
 560         list_for_each_entry(tgt, &vhost->targets, queue)
 561                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 562         ibmvfc_set_host_state(vhost, state);
 563         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 564         vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 565         wake_up(&vhost->work_wait_q);
 566         LEAVE;
 567 }
 568
 569 /**
 570  * ibmvfc_init_host - Start host initialization
 571  * @vhost:              ibmvfc host struct
 572  *
 573  * Return value:
 574  *      nothing
 575  **/
 576 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
 577 {
 578         struct ibmvfc_target *tgt;
 579
 580         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 581                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 582                         dev_err(vhost->dev,
 583                                 "Host initialization retries exceeded. Taking adapter offline\n");
 584                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 585                         return;
 586                 }
 587         }
 588
 589         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 590                 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
 591                 vhost->async_crq.cur = 0;
 592
 593                 list_for_each_entry(tgt, &vhost->targets, queue)
 594                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 595                 scsi_block_requests(vhost->host);
 596                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 597                 vhost->job_step = ibmvfc_npiv_login;
 598                 wake_up(&vhost->work_wait_q);
 599         }
 600 }
 601
 602 /**
 603  * ibmvfc_send_crq - Send a CRQ
 604  * @vhost:      ibmvfc host struct
 605  * @word1:      the first 64 bits of the data
 606  * @word2:      the second 64 bits of the data
 607  *
 608  * Return value:
 609  *      0 on success / other on failure
 610  **/
 611 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 612 {
 613         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 614         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 615 }
 616
 617 /**
 618  * ibmvfc_send_crq_init - Send a CRQ init message
 619  * @vhost:      ibmvfc host struct
 620  *
 621  * Return value:
 622  *      0 on success / other on failure
 623  **/
 624 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
 625 {
 626         ibmvfc_dbg(vhost, "Sending CRQ init\n");
 627         return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 628 }
 629
 630 /**
 631  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 632  * @vhost:      ibmvfc host struct
 633  *
 634  * Return value:
 635  *      0 on success / other on failure
 636  **/
 637 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 638 {
 639         ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 640         return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 641 }
 642
 643 /**
 644  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 645  * @vhost:      ibmvfc host struct
 646  *
 647  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 648  * the crq with the hypervisor.
 649  **/
 650 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 651 {
 652         long rc = 0;
 653         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 654         struct ibmvfc_crq_queue *crq = &vhost->crq;
 655
 656         ibmvfc_dbg(vhost, "Releasing CRQ\n");
 657         free_irq(vdev->irq, vhost);
 658         tasklet_kill(&vhost->tasklet);
 659         do {
 660                 if (rc)
 661                         msleep(100);
 662                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 663         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 664
 665         vhost->state = IBMVFC_NO_CRQ;
 666         vhost->logged_in = 0;
 667         dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 668         free_page((unsigned long)crq->msgs);
 669 }
 670
 671 /**
 672  * ibmvfc_reenable_crq_queue - reenables the CRQ
 673  * @vhost:      ibmvfc host struct
 674  *
 675  * Return value:
 676  *      0 on success / other on failure
 677  **/
 678 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 679 {
 680         int rc = 0;
 681         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 682
 683         /* Re-enable the CRQ */
 684         do {
 685                 if (rc)
 686                         msleep(100);
 687                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 688         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 689
 690         if (rc)
 691                 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 692
 693         return rc;
 694 }
 695
 696 /**
 697  * ibmvfc_reset_crq - resets a crq after a failure
 698  * @vhost:      ibmvfc host struct
 699  *
 700  * Return value:
 701  *      0 on success / other on failure
 702  **/
 703 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 704 {
 705         int rc = 0;
 706         unsigned long flags;
 707         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 708         struct ibmvfc_crq_queue *crq = &vhost->crq;
 709
 710         /* Close the CRQ */
 711         do {
 712                 if (rc)
 713                         msleep(100);
 714                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 715         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 716
 717         spin_lock_irqsave(vhost->host->host_lock, flags);
 718         vhost->state = IBMVFC_NO_CRQ;
 719         vhost->logged_in = 0;
 720         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
 721
 722         /* Clean out the queue */
 723         memset(crq->msgs, 0, PAGE_SIZE);
 724         crq->cur = 0;
 725
 726         /* And re-open it again */
 727         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 728                                 crq->msg_token, PAGE_SIZE);
 729
 730         if (rc == H_CLOSED)
 731                 /* Adapter is good, but other end is not ready */
 732                 dev_warn(vhost->dev, "Partner adapter not ready\n");
 733         else if (rc != 0)
 734                 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 735         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 736
 737         return rc;
 738 }
 739
 740 /**
 741  * ibmvfc_valid_event - Determines if event is valid.
 742  * @pool:       event_pool that contains the event
 743  * @evt:        ibmvfc event to be checked for validity
 744  *
 745  * Return value:
 746  *      1 if event is valid / 0 if event is not valid
 747  **/
 748 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
 749                               struct ibmvfc_event *evt)
 750 {
 751         int index = evt - pool->events;
 752         if (index < 0 || index >= pool->size)   /* outside of bounds */
 753                 return 0;
 754         if (evt != pool->events + index)        /* unaligned */
 755                 return 0;
 756         return 1;
 757 }
 758
 759 /**
 760  * ibmvfc_free_event - Free the specified event
 761  * @evt:        ibmvfc_event to be freed
 762  *
 763  **/
 764 static void ibmvfc_free_event(struct ibmvfc_event *evt)
 765 {
 766         struct ibmvfc_host *vhost = evt->vhost;
 767         struct ibmvfc_event_pool *pool = &vhost->pool;
 768
 769         BUG_ON(!ibmvfc_valid_event(pool, evt));
 770         BUG_ON(atomic_inc_return(&evt->free) != 1);
 771         list_add_tail(&evt->queue, &vhost->free);
 772 }
 773
 774 /**
 775  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
 776  * @evt:        ibmvfc event struct
 777  *
 778  * This function does not setup any error status, that must be done
 779  * before this function gets called.
 780  **/
 781 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
 782 {
 783         struct scsi_cmnd *cmnd = evt->cmnd;
 784
 785         if (cmnd) {
 786                 scsi_dma_unmap(cmnd);
 787                 cmnd->scsi_done(cmnd);
 788         }
 789
 790         if (evt->eh_comp)
 791                 complete(evt->eh_comp);
 792
 793         ibmvfc_free_event(evt);
 794 }
 795
 796 /**
 797  * ibmvfc_fail_request - Fail request with specified error code
 798  * @evt:                ibmvfc event struct
 799  * @error_code: error code to fail request with
 800  *
 801  * Return value:
 802  *      none
 803  **/
 804 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
 805 {
 806         if (evt->cmnd) {
 807                 evt->cmnd->result = (error_code << 16);
 808                 evt->done = ibmvfc_scsi_eh_done;
 809         } else
 810                 evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;
 811
 812         list_del(&evt->queue);
 813         del_timer(&evt->timer);
 814         ibmvfc_trc_end(evt);
 815         evt->done(evt);
 816 }
 817
 818 /**
 819  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
 820  * @vhost:              ibmvfc host struct
 821  * @error_code: error code to fail requests with
 822  *
 823  * Return value:
 824  *      none
 825  **/
 826 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
 827 {
 828         struct ibmvfc_event *evt, *pos;
 829
 830         ibmvfc_dbg(vhost, "Purging all requests\n");
 831         list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
 832                 ibmvfc_fail_request(evt, error_code);
 833 }
 834
 835 /**
 836  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
 837  * @vhost:      struct ibmvfc host to reset
 838  **/
 839 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
 840 {
 841         ibmvfc_purge_requests(vhost, DID_ERROR);
 842         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
 843         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
 844 }
 845
 846 /**
 847  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
 848  * @vhost:      struct ibmvfc host to reset
 849  **/
 850 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
 851 {
 852         if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
 853             !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 854                 scsi_block_requests(vhost->host);
 855                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
 856                 vhost->job_step = ibmvfc_npiv_logout;
 857                 wake_up(&vhost->work_wait_q);
 858         } else
 859                 ibmvfc_hard_reset_host(vhost);
 860 }
 861
 862 /**
 863  * ibmvfc_reset_host - Reset the connection to the server
 864  * @vhost:      ibmvfc host struct
 865  **/
 866 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
 867 {
 868         unsigned long flags;
 869
 870         spin_lock_irqsave(vhost->host->host_lock, flags);
 871         __ibmvfc_reset_host(vhost);
 872         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 873 }
 874
 875 /**
 876  * ibmvfc_retry_host_init - Retry host initialization if allowed
 877  * @vhost:      ibmvfc host struct
 878  *
 879  * Returns: 1 if init will be retried / 0 if not
 880  *
 881  **/
 882 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
 883 {
 884         int retry = 0;
 885
 886         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 887                 vhost->delay_init = 1;
 888                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 889                         dev_err(vhost->dev,
 890                                 "Host initialization retries exceeded. Taking adapter offline\n");
 891                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 892                 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
 893                         __ibmvfc_reset_host(vhost);
 894                 else {
 895                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 896                         retry = 1;
 897                 }
 898         }
 899
 900         wake_up(&vhost->work_wait_q);
 901         return retry;
 902 }
 903
 904 /**
 905  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
 906  * @starget:    scsi target struct
 907  *
 908  * Return value:
 909  *      ibmvfc_target struct / NULL if not found
 910  **/
 911 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
 912 {
 913         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 914         struct ibmvfc_host *vhost = shost_priv(shost);
 915         struct ibmvfc_target *tgt;
 916
 917         list_for_each_entry(tgt, &vhost->targets, queue)
 918                 if (tgt->target_id == starget->id) {
 919                         kref_get(&tgt->kref);
 920                         return tgt;
 921                 }
 922         return NULL;
 923 }
 924
 925 /**
 926  * ibmvfc_get_target - Find the specified scsi_target
 927  * @starget:    scsi target struct
 928  *
 929  * Return value:
 930  *      ibmvfc_target struct / NULL if not found
 931  **/
 932 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
 933 {
 934         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 935         struct ibmvfc_target *tgt;
 936         unsigned long flags;
 937
 938         spin_lock_irqsave(shost->host_lock, flags);
 939         tgt = __ibmvfc_get_target(starget);
 940         spin_unlock_irqrestore(shost->host_lock, flags);
 941         return tgt;
 942 }
 943
 944 /**
 945  * ibmvfc_get_host_speed - Get host port speed
 946  * @shost:              scsi host struct
 947  *
 948  * Return value:
 949  *      none
 950  **/
 951 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
 952 {
 953         struct ibmvfc_host *vhost = shost_priv(shost);
 954         unsigned long flags;
 955
 956         spin_lock_irqsave(shost->host_lock, flags);
 957         if (vhost->state == IBMVFC_ACTIVE) {
 958                 switch (vhost->login_buf->resp.link_speed / 100) {
 959                 case 1:
 960                         fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
 961                         break;
 962                 case 2:
 963                         fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
 964                         break;
 965                 case 4:
 966                         fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
 967                         break;
 968                 case 8:
 969                         fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
 970                         break;
 971                 case 10:
 972                         fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
 973                         break;
 974                 case 16:
 975                         fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
 976                         break;
 977                 default:
 978                         ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
 979                                    vhost->login_buf->resp.link_speed / 100);
 980                         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 981                         break;
 982                 }
 983         } else
 984                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 985         spin_unlock_irqrestore(shost->host_lock, flags);
 986 }
 987
 988 /**
 989  * ibmvfc_get_host_port_state - Get host port state
 990  * @shost:              scsi host struct
 991  *
 992  * Return value:
 993  *      none
 994  **/
 995 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
 996 {
 997         struct ibmvfc_host *vhost = shost_priv(shost);
 998         unsigned long flags;
 999
1000         spin_lock_irqsave(shost->host_lock, flags);
1001         switch (vhost->state) {
1002         case IBMVFC_INITIALIZING:
1003         case IBMVFC_ACTIVE:
1004                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1005                 break;
1006         case IBMVFC_LINK_DOWN:
1007                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1008                 break;
1009         case IBMVFC_LINK_DEAD:
1010         case IBMVFC_HOST_OFFLINE:
1011                 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1012                 break;
1013         case IBMVFC_HALTED:
1014                 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1015                 break;
1016         case IBMVFC_NO_CRQ:
1017                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1018                 break;
1019         default:
1020                 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1021                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1022                 break;
1023         }
1024         spin_unlock_irqrestore(shost->host_lock, flags);
1025 }
1026
1027 /**
1028  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1029  * @rport:              rport struct
1030  * @timeout:    timeout value
1031  *
1032  * Return value:
1033  *      none
1034  **/
1035 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1036 {
1037         if (timeout)
1038                 rport->dev_loss_tmo = timeout;
1039         else
1040                 rport->dev_loss_tmo = 1;
1041 }
1042
1043 /**
1044  * ibmvfc_release_tgt - Free memory allocated for a target
1045  * @kref:               kref struct
1046  *
1047  **/
1048 static void ibmvfc_release_tgt(struct kref *kref)
1049 {
1050         struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1051         kfree(tgt);
1052 }
1053
1054 /**
1055  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1056  * @starget:    scsi target struct
1057  *
1058  * Return value:
1059  *      none
1060  **/
1061 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1062 {
1063         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1064         fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1065         if (tgt)
1066                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1067 }
1068
1069 /**
1070  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1071  * @starget:    scsi target struct
1072  *
1073  * Return value:
1074  *      none
1075  **/
1076 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1077 {
1078         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1079         fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1080         if (tgt)
1081                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1082 }
1083
1084 /**
1085  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1086  * @starget:    scsi target struct
1087  *
1088  * Return value:
1089  *      none
1090  **/
1091 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1092 {
1093         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1094         fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1095         if (tgt)
1096                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1097 }
1098
1099 /**
1100  * ibmvfc_wait_while_resetting - Wait while the host resets
1101  * @vhost:              ibmvfc host struct
1102  *
1103  * Return value:
1104  *      0 on success / other on failure
1105  **/
1106 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1107 {
1108         long timeout = wait_event_timeout(vhost->init_wait_q,
1109                                           ((vhost->state == IBMVFC_ACTIVE ||
1110                                             vhost->state == IBMVFC_HOST_OFFLINE ||
1111                                             vhost->state == IBMVFC_LINK_DEAD) &&
1112                                            vhost->action == IBMVFC_HOST_ACTION_NONE),
1113                                           (init_timeout * HZ));
1114
1115         return timeout ? 0 : -EIO;
1116 }
1117
1118 /**
1119  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1120  * @shost:              scsi host struct
1121  *
1122  * Return value:
1123  *      0 on success / other on failure
1124  **/
1125 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1126 {
1127         struct ibmvfc_host *vhost = shost_priv(shost);
1128
1129         dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1130         ibmvfc_reset_host(vhost);
1131         return ibmvfc_wait_while_resetting(vhost);
1132 }
1133
1134 /**
1135  * ibmvfc_gather_partition_info - Gather info about the LPAR
1136  *
1137  * Return value:
1138  *      none
1139  **/
1140 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1141 {
1142         struct device_node *rootdn;
1143         const char *name;
1144         const unsigned int *num;
1145
1146         rootdn = of_find_node_by_path("/");
1147         if (!rootdn)
1148                 return;
1149
1150         name = of_get_property(rootdn, "ibm,partition-name", NULL);
1151         if (name)
1152                 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1153         num = of_get_property(rootdn, "ibm,partition-no", NULL);
1154         if (num)
1155                 vhost->partition_number = *num;
1156         of_node_put(rootdn);
1157 }
1158
1159 /**
1160  * ibmvfc_set_login_info - Setup info for NPIV login
1161  * @vhost:      ibmvfc host struct
1162  *
1163  * Return value:
1164  *      none
1165  **/
1166 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1167 {
1168         struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1169         struct device_node *of_node = vhost->dev->of_node;
1170         const char *location;
1171
1172         memset(login_info, 0, sizeof(*login_info));
1173
1174         login_info->ostype = IBMVFC_OS_LINUX;
1175         login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
1176         login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
1177         login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
1178         login_info->partition_num = vhost->partition_number;
1179         login_info->vfc_frame_version = 1;
1180         login_info->fcp_version = 3;
1181         login_info->flags = IBMVFC_FLUSH_ON_HALT;
1182         if (vhost->client_migrated)
1183                 login_info->flags |= IBMVFC_CLIENT_MIGRATED;
1184
1185         login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1186         login_info->capabilities = IBMVFC_CAN_MIGRATE;
1187         login_info->async.va = vhost->async_crq.msg_token;
1188         login_info->async.len = vhost->async_crq.size * sizeof(*vhost->async_crq.msgs);
1189         strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1190         strncpy(login_info->device_name,
1191                 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1192
1193         location = of_get_property(of_node, "ibm,loc-code", NULL);
1194         location = location ? location : dev_name(vhost->dev);
1195         strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1196 }
1197
1198 /**
1199  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1200  * @vhost:      ibmvfc host who owns the event pool
1201  *
1202  * Returns zero on success.
1203  **/
1204 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1205 {
1206         int i;
1207         struct ibmvfc_event_pool *pool = &vhost->pool;
1208
1209         ENTER;
1210         pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1211         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1212         if (!pool->events)
1213                 return -ENOMEM;
1214
1215         pool->iu_storage = dma_alloc_coherent(vhost->dev,
1216                                               pool->size * sizeof(*pool->iu_storage),
1217                                               &pool->iu_token, 0);
1218
1219         if (!pool->iu_storage) {
1220                 kfree(pool->events);
1221                 return -ENOMEM;
1222         }
1223
1224         for (i = 0; i < pool->size; ++i) {
1225                 struct ibmvfc_event *evt = &pool->events[i];
1226                 atomic_set(&evt->free, 1);
1227                 evt->crq.valid = 0x80;
1228                 evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
1229                 evt->xfer_iu = pool->iu_storage + i;
1230                 evt->vhost = vhost;
1231                 evt->ext_list = NULL;
1232                 list_add_tail(&evt->queue, &vhost->free);
1233         }
1234
1235         LEAVE;
1236         return 0;
1237 }
1238
1239 /**
1240  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1241  * @vhost:      ibmvfc host who owns the event pool
1242  *
1243  **/
1244 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1245 {
1246         int i;
1247         struct ibmvfc_event_pool *pool = &vhost->pool;
1248
1249         ENTER;
1250         for (i = 0; i < pool->size; ++i) {
1251                 list_del(&pool->events[i].queue);
1252                 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1253                 if (pool->events[i].ext_list)
1254                         dma_pool_free(vhost->sg_pool,
1255                                       pool->events[i].ext_list,
1256                                       pool->events[i].ext_list_token);
1257         }
1258
1259         kfree(pool->events);
1260         dma_free_coherent(vhost->dev,
1261                           pool->size * sizeof(*pool->iu_storage),
1262                           pool->iu_storage, pool->iu_token);
1263         LEAVE;
1264 }
1265
1266 /**
1267  * ibmvfc_get_event - Gets the next free event in pool
1268  * @vhost:      ibmvfc host struct
1269  *
1270  * Returns a free event from the pool.
1271  **/
1272 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1273 {
1274         struct ibmvfc_event *evt;
1275
1276         BUG_ON(list_empty(&vhost->free));
1277         evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1278         atomic_set(&evt->free, 0);
1279         list_del(&evt->queue);
1280         return evt;
1281 }
1282
1283 /**
1284  * ibmvfc_init_event - Initialize fields in an event struct that are always
1285  *                              required.
1286  * @evt:        The event
1287  * @done:       Routine to call when the event is responded to
1288  * @format:     SRP or MAD format
1289  **/
1290 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1291                               void (*done) (struct ibmvfc_event *), u8 format)
1292 {
1293         evt->cmnd = NULL;
1294         evt->sync_iu = NULL;
1295         evt->crq.format = format;
1296         evt->done = done;
1297         evt->eh_comp = NULL;
1298 }
1299
1300 /**
1301  * ibmvfc_map_sg_list - Initialize scatterlist
1302  * @scmd:       scsi command struct
1303  * @nseg:       number of scatterlist segments
1304  * @md: memory descriptor list to initialize
1305  **/
1306 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1307                                struct srp_direct_buf *md)
1308 {
1309         int i;
1310         struct scatterlist *sg;
1311
1312         scsi_for_each_sg(scmd, sg, nseg, i) {
1313                 md[i].va = sg_dma_address(sg);
1314                 md[i].len = sg_dma_len(sg);
1315                 md[i].key = 0;
1316         }
1317 }
1318
1319 /**
1320  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1321  * @scmd:               Scsi_Cmnd with the scatterlist
1322  * @evt:                ibmvfc event struct
1323  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1324  * @dev:                device for which to map dma memory
1325  *
1326  * Returns:
1327  *      0 on success / non-zero on failure
1328  **/
1329 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1330                               struct ibmvfc_event *evt,
1331                               struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1332 {
1333
1334         int sg_mapped;
1335         struct srp_direct_buf *data = &vfc_cmd->ioba;
1336         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1337
1338         sg_mapped = scsi_dma_map(scmd);
1339         if (!sg_mapped) {
1340                 vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
1341                 return 0;
1342         } else if (unlikely(sg_mapped < 0)) {
1343                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1344                         scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1345                 return sg_mapped;
1346         }
1347
1348         if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1349                 vfc_cmd->flags |= IBMVFC_WRITE;
1350                 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1351         } else {
1352                 vfc_cmd->flags |= IBMVFC_READ;
1353                 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1354         }
1355
1356         if (sg_mapped == 1) {
1357                 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1358                 return 0;
1359         }
1360
1361         vfc_cmd->flags |= IBMVFC_SCATTERLIST;
1362
1363         if (!evt->ext_list) {
1364                 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1365                                                &evt->ext_list_token);
1366
1367                 if (!evt->ext_list) {
1368                         scsi_dma_unmap(scmd);
1369                         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1370                                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1371                         return -ENOMEM;
1372                 }
1373         }
1374
1375         ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1376
1377         data->va = evt->ext_list_token;
1378         data->len = sg_mapped * sizeof(struct srp_direct_buf);
1379         data->key = 0;
1380         return 0;
1381 }
1382
1383 /**
1384  * ibmvfc_timeout - Internal command timeout handler
1385  * @evt:        struct ibmvfc_event that timed out
1386  *
1387  * Called when an internally generated command times out
1388  **/
1389 static void ibmvfc_timeout(struct ibmvfc_event *evt)
1390 {
1391         struct ibmvfc_host *vhost = evt->vhost;
1392         dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1393         ibmvfc_reset_host(vhost);
1394 }
1395
1396 /**
1397  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1398  * @evt:                event to be sent
1399  * @vhost:              ibmvfc host struct
1400  * @timeout:    timeout in seconds - 0 means do not time command
1401  *
1402  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1403  **/
1404 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1405                              struct ibmvfc_host *vhost, unsigned long timeout)
1406 {
1407         u64 *crq_as_u64 = (u64 *) &evt->crq;
1408         int rc;
1409
1410         /* Copy the IU into the transfer area */
1411         *evt->xfer_iu = evt->iu;
1412         if (evt->crq.format == IBMVFC_CMD_FORMAT)
1413                 evt->xfer_iu->cmd.tag = (u64)evt;
1414         else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1415                 evt->xfer_iu->mad_common.tag = (u64)evt;
1416         else
1417                 BUG();
1418
1419         list_add_tail(&evt->queue, &vhost->sent);
1420         init_timer(&evt->timer);
1421
1422         if (timeout) {
1423                 evt->timer.data = (unsigned long) evt;
1424                 evt->timer.expires = jiffies + (timeout * HZ);
1425                 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1426                 add_timer(&evt->timer);
1427         }
1428
1429         mb();
1430
1431         if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
1432                 list_del(&evt->queue);
1433                 del_timer(&evt->timer);
1434
1435                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1436                  * Firmware will send a CRQ with a transport event (0xFF) to
1437                  * tell this client what has happened to the transport. This
1438                  * will be handled in ibmvfc_handle_crq()
1439                  */
1440                 if (rc == H_CLOSED) {
1441                         if (printk_ratelimit())
1442                                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1443                         if (evt->cmnd)
1444                                 scsi_dma_unmap(evt->cmnd);
1445                         ibmvfc_free_event(evt);
1446                         return SCSI_MLQUEUE_HOST_BUSY;
1447                 }
1448
1449                 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1450                 if (evt->cmnd) {
1451                         evt->cmnd->result = DID_ERROR << 16;
1452                         evt->done = ibmvfc_scsi_eh_done;
1453                 } else
1454                         evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
1455
1456                 evt->done(evt);
1457         } else
1458                 ibmvfc_trc_start(evt);
1459
1460         return 0;
1461 }
1462
1463 /**
1464  * ibmvfc_log_error - Log an error for the failed command if appropriate
1465  * @evt:        ibmvfc event to log
1466  *
1467  **/
1468 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1469 {
1470         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1471         struct ibmvfc_host *vhost = evt->vhost;
1472         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1473         struct scsi_cmnd *cmnd = evt->cmnd;
1474         const char *err = unknown_error;
1475         int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
1476         int logerr = 0;
1477         int rsp_code = 0;
1478
1479         if (index >= 0) {
1480                 logerr = cmd_status[index].log;
1481                 err = cmd_status[index].name;
1482         }
1483
1484         if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1485                 return;
1486
1487         if (rsp->flags & FCP_RSP_LEN_VALID)
1488                 rsp_code = rsp->data.info.rsp_code;
1489
1490         scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1491                     "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1492                     cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1493                     rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1494 }
1495
1496 /**
1497  * ibmvfc_relogin - Log back into the specified device
1498  * @sdev:       scsi device struct
1499  *
1500  **/
1501 static void ibmvfc_relogin(struct scsi_device *sdev)
1502 {
1503         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1504         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1505         struct ibmvfc_target *tgt;
1506
1507         list_for_each_entry(tgt, &vhost->targets, queue) {
1508                 if (rport == tgt->rport) {
1509                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1510                         break;
1511                 }
1512         }
1513
1514         ibmvfc_reinit_host(vhost);
1515 }
1516
1517 /**
1518  * ibmvfc_scsi_done - Handle responses from commands
1519  * @evt:        ibmvfc event to be handled
1520  *
1521  * Used as a callback when sending scsi cmds.
1522  **/
1523 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1524 {
1525         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1526         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1527         struct scsi_cmnd *cmnd = evt->cmnd;
1528         u32 rsp_len = 0;
1529         u32 sense_len = rsp->fcp_sense_len;
1530
1531         if (cmnd) {
1532                 if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
1533                         scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
1534                 else if (rsp->flags & FCP_RESID_UNDER)
1535                         scsi_set_resid(cmnd, rsp->fcp_resid);
1536                 else
1537                         scsi_set_resid(cmnd, 0);
1538
1539                 if (vfc_cmd->status) {
1540                         cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1541
1542                         if (rsp->flags & FCP_RSP_LEN_VALID)
1543                                 rsp_len = rsp->fcp_rsp_len;
1544                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1545                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1546                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1547                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1548                         if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
1549                                 ibmvfc_relogin(cmnd->device);
1550
1551                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1552                                 cmnd->result = (DID_ERROR << 16);
1553
1554                         ibmvfc_log_error(evt);
1555                 }
1556
1557                 if (!cmnd->result &&
1558                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1559                         cmnd->result = (DID_ERROR << 16);
1560
1561                 scsi_dma_unmap(cmnd);
1562                 cmnd->scsi_done(cmnd);
1563         }
1564
1565         if (evt->eh_comp)
1566                 complete(evt->eh_comp);
1567
1568         ibmvfc_free_event(evt);
1569 }
1570
1571 /**
1572  * ibmvfc_host_chkready - Check if the host can accept commands
1573  * @vhost:       struct ibmvfc host
1574  *
1575  * Returns:
1576  *      1 if host can accept command / 0 if not
1577  **/
1578 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1579 {
1580         int result = 0;
1581
1582         switch (vhost->state) {
1583         case IBMVFC_LINK_DEAD:
1584         case IBMVFC_HOST_OFFLINE:
1585                 result = DID_NO_CONNECT << 16;
1586                 break;
1587         case IBMVFC_NO_CRQ:
1588         case IBMVFC_INITIALIZING:
1589         case IBMVFC_HALTED:
1590         case IBMVFC_LINK_DOWN:
1591                 result = DID_REQUEUE << 16;
1592                 break;
1593         case IBMVFC_ACTIVE:
1594                 result = 0;
1595                 break;
1596         };
1597
1598         return result;
1599 }
1600
1601 /**
1602  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1603  * @cmnd:       struct scsi_cmnd to be executed
1604  * @done:       Callback function to be called when cmnd is completed
1605  *
1606  * Returns:
1607  *      0 on success / other on failure
1608  **/
1609 static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
1610                                void (*done) (struct scsi_cmnd *))
1611 {
1612         struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1613         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1614         struct ibmvfc_cmd *vfc_cmd;
1615         struct ibmvfc_event *evt;
1616         u8 tag[2];
1617         int rc;
1618
1619         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1620             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1621                 cmnd->result = rc;
1622                 done(cmnd);
1623                 return 0;
1624         }
1625
1626         cmnd->result = (DID_OK << 16);
1627         evt = ibmvfc_get_event(vhost);
1628         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1629         evt->cmnd = cmnd;
1630         cmnd->scsi_done = done;
1631         vfc_cmd = &evt->iu.cmd;
1632         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1633         vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1634         vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
1635         vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
1636         vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
1637         vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
1638         vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
1639         vfc_cmd->tgt_scsi_id = rport->port_id;
1640         vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
1641         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1642         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1643
1644         if (scsi_populate_tag_msg(cmnd, tag)) {
1645                 vfc_cmd->task_tag = tag[1];
1646                 switch (tag[0]) {
1647                 case MSG_SIMPLE_TAG:
1648                         vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1649                         break;
1650                 case MSG_HEAD_TAG:
1651                         vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
1652                         break;
1653                 case MSG_ORDERED_TAG:
1654                         vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
1655                         break;
1656                 };
1657         }
1658
1659         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1660                 return ibmvfc_send_event(evt, vhost, 0);
1661
1662         ibmvfc_free_event(evt);
1663         if (rc == -ENOMEM)
1664                 return SCSI_MLQUEUE_HOST_BUSY;
1665
1666         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1667                 scmd_printk(KERN_ERR, cmnd,
1668                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1669
1670         cmnd->result = DID_ERROR << 16;
1671         done(cmnd);
1672         return 0;
1673 }
1674
1675 /**
1676  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1677  * @evt:        ibmvfc event struct
1678  *
1679  **/
1680 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1681 {
1682         /* copy the response back */
1683         if (evt->sync_iu)
1684                 *evt->sync_iu = *evt->xfer_iu;
1685
1686         complete(&evt->comp);
1687 }
1688
1689 /**
1690  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1691  * @evt:        struct ibmvfc_event
1692  *
1693  **/
1694 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1695 {
1696         struct ibmvfc_host *vhost = evt->vhost;
1697
1698         ibmvfc_free_event(evt);
1699         vhost->aborting_passthru = 0;
1700         dev_info(vhost->dev, "Passthru command cancelled\n");
1701 }
1702
1703 /**
1704  * ibmvfc_bsg_timeout - Handle a BSG timeout
1705  * @job:        struct fc_bsg_job that timed out
1706  *
1707  * Returns:
1708  *      0 on success / other on failure
1709  **/
1710 static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
1711 {
1712         struct ibmvfc_host *vhost = shost_priv(job->shost);
1713         unsigned long port_id = (unsigned long)job->dd_data;
1714         struct ibmvfc_event *evt;
1715         struct ibmvfc_tmf *tmf;
1716         unsigned long flags;
1717         int rc;
1718
1719         ENTER;
1720         spin_lock_irqsave(vhost->host->host_lock, flags);
1721         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1722                 __ibmvfc_reset_host(vhost);
1723                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1724                 return 0;
1725         }
1726
1727         vhost->aborting_passthru = 1;
1728         evt = ibmvfc_get_event(vhost);
1729         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1730
1731         tmf = &evt->iu.tmf;
1732         memset(tmf, 0, sizeof(*tmf));
1733         tmf->common.version = 1;
1734         tmf->common.opcode = IBMVFC_TMF_MAD;
1735         tmf->common.length = sizeof(*tmf);
1736         tmf->scsi_id = port_id;
1737         tmf->cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
1738         tmf->my_cancel_key = IBMVFC_INTERNAL_CANCEL_KEY;
1739         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1740
1741         if (rc != 0) {
1742                 vhost->aborting_passthru = 0;
1743                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1744                 rc = -EIO;
1745         } else
1746                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1747                          port_id);
1748
1749         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1750
1751         LEAVE;
1752         return rc;
1753 }
1754
1755 /**
1756  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1757  * @vhost:              struct ibmvfc_host to send command
1758  * @port_id:    port ID to send command
1759  *
1760  * Returns:
1761  *      0 on success / other on failure
1762  **/
1763 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1764 {
1765         struct ibmvfc_port_login *plogi;
1766         struct ibmvfc_target *tgt;
1767         struct ibmvfc_event *evt;
1768         union ibmvfc_iu rsp_iu;
1769         unsigned long flags;
1770         int rc = 0, issue_login = 1;
1771
1772         ENTER;
1773         spin_lock_irqsave(vhost->host->host_lock, flags);
1774         list_for_each_entry(tgt, &vhost->targets, queue) {
1775                 if (tgt->scsi_id == port_id) {
1776                         issue_login = 0;
1777                         break;
1778                 }
1779         }
1780
1781         if (!issue_login)
1782                 goto unlock_out;
1783         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1784                 goto unlock_out;
1785
1786         evt = ibmvfc_get_event(vhost);
1787         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1788         plogi = &evt->iu.plogi;
1789         memset(plogi, 0, sizeof(*plogi));
1790         plogi->common.version = 1;
1791         plogi->common.opcode = IBMVFC_PORT_LOGIN;
1792         plogi->common.length = sizeof(*plogi);
1793         plogi->scsi_id = port_id;
1794         evt->sync_iu = &rsp_iu;
1795         init_completion(&evt->comp);
1796
1797         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1798         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1799
1800         if (rc)
1801                 return -EIO;
1802
1803         wait_for_completion(&evt->comp);
1804
1805         if (rsp_iu.plogi.common.status)
1806                 rc = -EIO;
1807
1808         spin_lock_irqsave(vhost->host->host_lock, flags);
1809         ibmvfc_free_event(evt);
1810 unlock_out:
1811         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1812         LEAVE;
1813         return rc;
1814 }
1815
1816 /**
1817  * ibmvfc_bsg_request - Handle a BSG request
1818  * @job:        struct fc_bsg_job to be executed
1819  *
1820  * Returns:
1821  *      0 on success / other on failure
1822  **/
1823 static int ibmvfc_bsg_request(struct fc_bsg_job *job)
1824 {
1825         struct ibmvfc_host *vhost = shost_priv(job->shost);
1826         struct fc_rport *rport = job->rport;
1827         struct ibmvfc_passthru_mad *mad;
1828         struct ibmvfc_event *evt;
1829         union ibmvfc_iu rsp_iu;
1830         unsigned long flags, port_id = -1;
1831         unsigned int code = job->request->msgcode;
1832         int rc = 0, req_seg, rsp_seg, issue_login = 0;
1833         u32 fc_flags, rsp_len;
1834
1835         ENTER;
1836         job->reply->reply_payload_rcv_len = 0;
1837         if (rport)
1838                 port_id = rport->port_id;
1839
1840         switch (code) {
1841         case FC_BSG_HST_ELS_NOLOGIN:
1842                 port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
1843                         (job->request->rqst_data.h_els.port_id[1] << 8) |
1844                         job->request->rqst_data.h_els.port_id[2];
1845         case FC_BSG_RPT_ELS:
1846                 fc_flags = IBMVFC_FC_ELS;
1847                 break;
1848         case FC_BSG_HST_CT:
1849                 issue_login = 1;
1850                 port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
1851                         (job->request->rqst_data.h_ct.port_id[1] << 8) |
1852                         job->request->rqst_data.h_ct.port_id[2];
1853         case FC_BSG_RPT_CT:
1854                 fc_flags = IBMVFC_FC_CT_IU;
1855                 break;
1856         default:
1857                 return -ENOTSUPP;
1858         };
1859
1860         if (port_id == -1)
1861                 return -EINVAL;
1862         if (!mutex_trylock(&vhost->passthru_mutex))
1863                 return -EBUSY;
1864
1865         job->dd_data = (void *)port_id;
1866         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1867                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1868
1869         if (!req_seg) {
1870                 mutex_unlock(&vhost->passthru_mutex);
1871                 return -ENOMEM;
1872         }
1873
1874         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1875                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1876
1877         if (!rsp_seg) {
1878                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1879                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1880                 mutex_unlock(&vhost->passthru_mutex);
1881                 return -ENOMEM;
1882         }
1883
1884         if (req_seg > 1 || rsp_seg > 1) {
1885                 rc = -EINVAL;
1886                 goto out;
1887         }
1888
1889         if (issue_login)
1890                 rc = ibmvfc_bsg_plogi(vhost, port_id);
1891
1892         spin_lock_irqsave(vhost->host->host_lock, flags);
1893
1894         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1895             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1896                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1897                 goto out;
1898         }
1899
1900         evt = ibmvfc_get_event(vhost);
1901         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1902         mad = &evt->iu.passthru;
1903
1904         memset(mad, 0, sizeof(*mad));
1905         mad->common.version = 1;
1906         mad->common.opcode = IBMVFC_PASSTHRU;
1907         mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
1908
1909         mad->cmd_ioba.va = (u64)evt->crq.ioba +
1910                 offsetof(struct ibmvfc_passthru_mad, iu);
1911         mad->cmd_ioba.len = sizeof(mad->iu);
1912
1913         mad->iu.cmd_len = job->request_payload.payload_len;
1914         mad->iu.rsp_len = job->reply_payload.payload_len;
1915         mad->iu.flags = fc_flags;
1916         mad->iu.cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
1917
1918         mad->iu.cmd.va = sg_dma_address(job->request_payload.sg_list);
1919         mad->iu.cmd.len = sg_dma_len(job->request_payload.sg_list);
1920         mad->iu.rsp.va = sg_dma_address(job->reply_payload.sg_list);
1921         mad->iu.rsp.len = sg_dma_len(job->reply_payload.sg_list);
1922         mad->iu.scsi_id = port_id;
1923         mad->iu.tag = (u64)evt;
1924         rsp_len = mad->iu.rsp.len;
1925
1926         evt->sync_iu = &rsp_iu;
1927         init_completion(&evt->comp);
1928         rc = ibmvfc_send_event(evt, vhost, 0);
1929         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1930
1931         if (rc) {
1932                 rc = -EIO;
1933                 goto out;
1934         }
1935
1936         wait_for_completion(&evt->comp);
1937
1938         if (rsp_iu.passthru.common.status)
1939                 rc = -EIO;
1940         else
1941                 job->reply->reply_payload_rcv_len = rsp_len;
1942
1943         spin_lock_irqsave(vhost->host->host_lock, flags);
1944         ibmvfc_free_event(evt);
1945         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1946         job->reply->result = rc;
1947         job->job_done(job);
1948         rc = 0;
1949 out:
1950         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1951                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
1952         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1953                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1954         mutex_unlock(&vhost->passthru_mutex);
1955         LEAVE;
1956         return rc;
1957 }
1958
1959 /**
1960  * ibmvfc_reset_device - Reset the device with the specified reset type
1961  * @sdev:       scsi device to reset
1962  * @type:       reset type
1963  * @desc:       reset type description for log messages
1964  *
1965  * Returns:
1966  *      0 on success / other on failure
1967  **/
1968 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1969 {
1970         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1971         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1972         struct ibmvfc_cmd *tmf;
1973         struct ibmvfc_event *evt = NULL;
1974         union ibmvfc_iu rsp_iu;
1975         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1976         int rsp_rc = -EBUSY;
1977         unsigned long flags;
1978         int rsp_code = 0;
1979
1980         spin_lock_irqsave(vhost->host->host_lock, flags);
1981         if (vhost->state == IBMVFC_ACTIVE) {
1982                 evt = ibmvfc_get_event(vhost);
1983                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1984
1985                 tmf = &evt->iu.cmd;
1986                 memset(tmf, 0, sizeof(*tmf));
1987                 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1988                 tmf->resp.len = sizeof(tmf->rsp);
1989                 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1990                 tmf->payload_len = sizeof(tmf->iu);
1991                 tmf->resp_len = sizeof(tmf->rsp);
1992                 tmf->cancel_key = (unsigned long)sdev->hostdata;
1993                 tmf->tgt_scsi_id = rport->port_id;
1994                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1995                 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1996                 tmf->iu.tmf_flags = type;
1997                 evt->sync_iu = &rsp_iu;
1998
1999                 init_completion(&evt->comp);
2000                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2001         }
2002         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2003
2004         if (rsp_rc != 0) {
2005                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2006                             desc, rsp_rc);
2007                 return -EIO;
2008         }
2009
2010         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2011         wait_for_completion(&evt->comp);
2012
2013         if (rsp_iu.cmd.status)
2014                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2015
2016         if (rsp_code) {
2017                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2018                         rsp_code = fc_rsp->data.info.rsp_code;
2019
2020                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2021                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2022                             desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
2023                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2024                             fc_rsp->scsi_status);
2025                 rsp_rc = -EIO;
2026         } else
2027                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2028
2029         spin_lock_irqsave(vhost->host->host_lock, flags);
2030         ibmvfc_free_event(evt);
2031         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2032         return rsp_rc;
2033 }
2034
2035 /**
2036  * ibmvfc_match_rport - Match function for specified remote port
2037  * @evt:        ibmvfc event struct
2038  * @device:     device to match (rport)
2039  *
2040  * Returns:
2041  *      1 if event matches rport / 0 if event does not match rport
2042  **/
2043 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2044 {
2045         struct fc_rport *cmd_rport;
2046
2047         if (evt->cmnd) {
2048                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2049                 if (cmd_rport == rport)
2050                         return 1;
2051         }
2052         return 0;
2053 }
2054
2055 /**
2056  * ibmvfc_match_target - Match function for specified target
2057  * @evt:        ibmvfc event struct
2058  * @device:     device to match (starget)
2059  *
2060  * Returns:
2061  *      1 if event matches starget / 0 if event does not match starget
2062  **/
2063 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2064 {
2065         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2066                 return 1;
2067         return 0;
2068 }
2069
2070 /**
2071  * ibmvfc_match_lun - Match function for specified LUN
2072  * @evt:        ibmvfc event struct
2073  * @device:     device to match (sdev)
2074  *
2075  * Returns:
2076  *      1 if event matches sdev / 0 if event does not match sdev
2077  **/
2078 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2079 {
2080         if (evt->cmnd && evt->cmnd->device == device)
2081                 return 1;
2082         return 0;
2083 }
2084
2085 /**
2086  * ibmvfc_wait_for_ops - Wait for ops to complete
2087  * @vhost:      ibmvfc host struct
2088  * @device:     device to match (starget or sdev)
2089  * @match:      match function
2090  *
2091  * Returns:
2092  *      SUCCESS / FAILED
2093  **/
2094 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2095                                int (*match) (struct ibmvfc_event *, void *))
2096 {
2097         struct ibmvfc_event *evt;
2098         DECLARE_COMPLETION_ONSTACK(comp);
2099         int wait;
2100         unsigned long flags;
2101         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2102
2103         ENTER;
2104         do {
2105                 wait = 0;
2106                 spin_lock_irqsave(vhost->host->host_lock, flags);
2107                 list_for_each_entry(evt, &vhost->sent, queue) {
2108                         if (match(evt, device)) {
2109                                 evt->eh_comp = &comp;
2110                                 wait++;
2111                         }
2112                 }
2113                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2114
2115                 if (wait) {
2116                         timeout = wait_for_completion_timeout(&comp, timeout);
2117
2118                         if (!timeout) {
2119                                 wait = 0;
2120                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2121                                 list_for_each_entry(evt, &vhost->sent, queue) {
2122                                         if (match(evt, device)) {
2123                                                 evt->eh_comp = NULL;
2124                                                 wait++;
2125                                         }
2126                                 }
2127                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2128                                 if (wait)
2129                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2130                                 LEAVE;
2131                                 return wait ? FAILED : SUCCESS;
2132                         }
2133                 }
2134         } while (wait);
2135
2136         LEAVE;
2137         return SUCCESS;
2138 }
2139
2140 /**
2141  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2142  * @sdev:       scsi device to cancel commands
2143  * @type:       type of error recovery being performed
2144  *
2145  * This sends a cancel to the VIOS for the specified device. This does
2146  * NOT send any abort to the actual device. That must be done separately.
2147  *
2148  * Returns:
2149  *      0 on success / other on failure
2150  **/
2151 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2152 {
2153         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2154         struct scsi_target *starget = scsi_target(sdev);
2155         struct fc_rport *rport = starget_to_rport(starget);
2156         struct ibmvfc_tmf *tmf;
2157         struct ibmvfc_event *evt, *found_evt;
2158         union ibmvfc_iu rsp;
2159         int rsp_rc = -EBUSY;
2160         unsigned long flags;
2161         u16 status;
2162
2163         ENTER;
2164         spin_lock_irqsave(vhost->host->host_lock, flags);
2165         found_evt = NULL;
2166         list_for_each_entry(evt, &vhost->sent, queue) {
2167                 if (evt->cmnd && evt->cmnd->device == sdev) {
2168                         found_evt = evt;
2169                         break;
2170                 }
2171         }
2172
2173         if (!found_evt) {
2174                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2175                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2176                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2177                 return 0;
2178         }
2179
2180         if (vhost->state == IBMVFC_ACTIVE) {
2181                 evt = ibmvfc_get_event(vhost);
2182                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2183
2184                 tmf = &evt->iu.tmf;
2185                 memset(tmf, 0, sizeof(*tmf));
2186                 tmf->common.version = 1;
2187                 tmf->common.opcode = IBMVFC_TMF_MAD;
2188                 tmf->common.length = sizeof(*tmf);
2189                 tmf->scsi_id = rport->port_id;
2190                 int_to_scsilun(sdev->lun, &tmf->lun);
2191                 tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
2192                 tmf->cancel_key = (unsigned long)sdev->hostdata;
2193                 tmf->my_cancel_key = (unsigned long)starget->hostdata;
2194
2195                 evt->sync_iu = &rsp;
2196                 init_completion(&evt->comp);
2197                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2198         }
2199
2200         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2201
2202         if (rsp_rc != 0) {
2203                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2204                 return -EIO;
2205         }
2206
2207         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2208
2209         wait_for_completion(&evt->comp);
2210         status = rsp.mad_common.status;
2211         spin_lock_irqsave(vhost->host->host_lock, flags);
2212         ibmvfc_free_event(evt);
2213         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2214
2215         if (status != IBMVFC_MAD_SUCCESS) {
2216                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2217                 return -EIO;
2218         }
2219
2220         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2221         return 0;
2222 }
2223
2224 /**
2225  * ibmvfc_match_key - Match function for specified cancel key
2226  * @evt:        ibmvfc event struct
2227  * @key:        cancel key to match
2228  *
2229  * Returns:
2230  *      1 if event matches key / 0 if event does not match key
2231  **/
2232 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2233 {
2234         unsigned long cancel_key = (unsigned long)key;
2235
2236         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2237             evt->iu.cmd.cancel_key == cancel_key)
2238                 return 1;
2239         return 0;
2240 }
2241
2242 /**
2243  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2244  * @sdev:       scsi device to abort commands
2245  *
2246  * This sends an Abort Task Set to the VIOS for the specified device. This does
2247  * NOT send any cancel to the VIOS. That must be done separately.
2248  *
2249  * Returns:
2250  *      0 on success / other on failure
2251  **/
2252 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2253 {
2254         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2255         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2256         struct ibmvfc_cmd *tmf;
2257         struct ibmvfc_event *evt, *found_evt;
2258         union ibmvfc_iu rsp_iu;
2259         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2260         int rc, rsp_rc = -EBUSY;
2261         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2262         int rsp_code = 0;
2263
2264         spin_lock_irqsave(vhost->host->host_lock, flags);
2265         found_evt = NULL;
2266         list_for_each_entry(evt, &vhost->sent, queue) {
2267                 if (evt->cmnd && evt->cmnd->device == sdev) {
2268                         found_evt = evt;
2269                         break;
2270                 }
2271         }
2272
2273         if (!found_evt) {
2274                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2275                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2276                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2277                 return 0;
2278         }
2279
2280         if (vhost->state == IBMVFC_ACTIVE) {
2281                 evt = ibmvfc_get_event(vhost);
2282                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2283
2284                 tmf = &evt->iu.cmd;
2285                 memset(tmf, 0, sizeof(*tmf));
2286                 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
2287                 tmf->resp.len = sizeof(tmf->rsp);
2288                 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
2289                 tmf->payload_len = sizeof(tmf->iu);
2290                 tmf->resp_len = sizeof(tmf->rsp);
2291                 tmf->cancel_key = (unsigned long)sdev->hostdata;
2292                 tmf->tgt_scsi_id = rport->port_id;
2293                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2294                 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
2295                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2296                 evt->sync_iu = &rsp_iu;
2297
2298                 init_completion(&evt->comp);
2299                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2300         }
2301
2302         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2303
2304         if (rsp_rc != 0) {
2305                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2306                 return -EIO;
2307         }
2308
2309         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2310         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2311
2312         if (!timeout) {
2313                 rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2314                 if (!rc) {
2315                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2316                         if (rc == SUCCESS)
2317                                 rc = 0;
2318                 }
2319
2320                 if (rc) {
2321                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2322                         ibmvfc_reset_host(vhost);
2323                         rsp_rc = 0;
2324                         goto out;
2325                 }
2326         }
2327
2328         if (rsp_iu.cmd.status)
2329                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2330
2331         if (rsp_code) {
2332                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2333                         rsp_code = fc_rsp->data.info.rsp_code;
2334
2335                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2336                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2337                             ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
2338                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2339                             fc_rsp->scsi_status);
2340                 rsp_rc = -EIO;
2341         } else
2342                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2343
2344 out:
2345         spin_lock_irqsave(vhost->host->host_lock, flags);
2346         ibmvfc_free_event(evt);
2347         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2348         return rsp_rc;
2349 }
2350
2351 /**
2352  * ibmvfc_eh_abort_handler - Abort a command
2353  * @cmd:        scsi command to abort
2354  *
2355  * Returns:
2356  *      SUCCESS / FAILED
2357  **/
2358 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2359 {
2360         struct scsi_device *sdev = cmd->device;
2361         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2362         int cancel_rc, abort_rc;
2363         int rc = FAILED;
2364
2365         ENTER;
2366         fc_block_scsi_eh(cmd);
2367         ibmvfc_wait_while_resetting(vhost);
2368         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2369         abort_rc = ibmvfc_abort_task_set(sdev);
2370
2371         if (!cancel_rc && !abort_rc)
2372                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2373
2374         LEAVE;
2375         return rc;
2376 }
2377
2378 /**
2379  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2380  * @cmd:        scsi command struct
2381  *
2382  * Returns:
2383  *      SUCCESS / FAILED
2384  **/
2385 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2386 {
2387         struct scsi_device *sdev = cmd->device;
2388         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2389         int cancel_rc, reset_rc;
2390         int rc = FAILED;
2391
2392         ENTER;
2393         fc_block_scsi_eh(cmd);
2394         ibmvfc_wait_while_resetting(vhost);
2395         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2396         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2397
2398         if (!cancel_rc && !reset_rc)
2399                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2400
2401         LEAVE;
2402         return rc;
2403 }
2404
2405 /**
2406  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2407  * @sdev:       scsi device struct
2408  * @data:       return code
2409  *
2410  **/
2411 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2412 {
2413         unsigned long *rc = data;
2414         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2415 }
2416
2417 /**
2418  * ibmvfc_eh_target_reset_handler - Reset the target
2419  * @cmd:        scsi command struct
2420  *
2421  * Returns:
2422  *      SUCCESS / FAILED
2423  **/
2424 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2425 {
2426         struct scsi_device *sdev = cmd->device;
2427         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2428         struct scsi_target *starget = scsi_target(sdev);
2429         int reset_rc;
2430         int rc = FAILED;
2431         unsigned long cancel_rc = 0;
2432
2433         ENTER;
2434         fc_block_scsi_eh(cmd);
2435         ibmvfc_wait_while_resetting(vhost);
2436         starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2437         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2438
2439         if (!cancel_rc && !reset_rc)
2440                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2441
2442         LEAVE;
2443         return rc;
2444 }
2445
2446 /**
2447  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2448  * @cmd:        struct scsi_cmnd having problems
2449  *
2450  **/
2451 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2452 {
2453         int rc;
2454         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2455
2456         fc_block_scsi_eh(cmd);
2457         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2458         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2459         return rc ? FAILED : SUCCESS;
2460 }
2461
2462 /**
2463  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2464  * @rport:              rport struct
2465  *
2466  * Return value:
2467  *      none
2468  **/
2469 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2470 {
2471         struct Scsi_Host *shost = rport_to_shost(rport);
2472         struct ibmvfc_host *vhost = shost_priv(shost);
2473         struct fc_rport *dev_rport;
2474         struct scsi_device *sdev;
2475         unsigned long rc;
2476
2477         ENTER;
2478         shost_for_each_device(sdev, shost) {
2479                 dev_rport = starget_to_rport(scsi_target(sdev));
2480                 if (dev_rport != rport)
2481                         continue;
2482                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2483                 ibmvfc_abort_task_set(sdev);
2484         }
2485
2486         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2487
2488         if (rc == FAILED)
2489                 ibmvfc_issue_fc_host_lip(shost);
2490         LEAVE;
2491 }
2492
2493 static const struct ibmvfc_async_desc ae_desc [] = {
2494         { IBMVFC_AE_ELS_PLOGI,          "PLOGI",                IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2495         { IBMVFC_AE_ELS_LOGO,           "LOGO",         IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2496         { IBMVFC_AE_ELS_PRLO,           "PRLO",         IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2497         { IBMVFC_AE_SCN_NPORT,          "N-Port SCN",   IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2498         { IBMVFC_AE_SCN_GROUP,          "Group SCN",    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2499         { IBMVFC_AE_SCN_DOMAIN,         "Domain SCN",   IBMVFC_DEFAULT_LOG_LEVEL },
2500         { IBMVFC_AE_SCN_FABRIC,         "Fabric SCN",   IBMVFC_DEFAULT_LOG_LEVEL },
2501         { IBMVFC_AE_LINK_UP,            "Link Up",              IBMVFC_DEFAULT_LOG_LEVEL },
2502         { IBMVFC_AE_LINK_DOWN,          "Link Down",    IBMVFC_DEFAULT_LOG_LEVEL },
2503         { IBMVFC_AE_LINK_DEAD,          "Link Dead",    IBMVFC_DEFAULT_LOG_LEVEL },
2504         { IBMVFC_AE_HALT,                       "Halt",         IBMVFC_DEFAULT_LOG_LEVEL },
2505         { IBMVFC_AE_RESUME,             "Resume",               IBMVFC_DEFAULT_LOG_LEVEL },
2506         { IBMVFC_AE_ADAPTER_FAILED,     "Adapter Failed",       IBMVFC_DEFAULT_LOG_LEVEL },
2507 };
2508
2509 static const struct ibmvfc_async_desc unknown_ae = {
2510         0, "Unknown async", IBMVFC_DEFAULT_LOG_LEVEL
2511 };
2512
2513 /**
2514  * ibmvfc_get_ae_desc - Get text description for async event
2515  * @ae: async event
2516  *
2517  **/
2518 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2519 {
2520         int i;
2521
2522         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2523                 if (ae_desc[i].ae == ae)
2524                         return &ae_desc[i];
2525
2526         return &unknown_ae;
2527 }
2528
2529 static const struct {
2530         enum ibmvfc_ae_link_state state;
2531         const char *desc;
2532 } link_desc [] = {
2533         { IBMVFC_AE_LS_LINK_UP,         " link up" },
2534         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
2535         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
2536         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
2537 };
2538
2539 /**
2540  * ibmvfc_get_link_state - Get text description for link state
2541  * @state:      link state
2542  *
2543  **/
2544 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2545 {
2546         int i;
2547
2548         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2549                 if (link_desc[i].state == state)
2550                         return link_desc[i].desc;
2551
2552         return "";
2553 }
2554
2555 /**
2556  * ibmvfc_handle_async - Handle an async event from the adapter
2557  * @crq:        crq to process
2558  * @vhost:      ibmvfc host struct
2559  *
2560  **/
2561 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2562                                 struct ibmvfc_host *vhost)
2563 {
2564         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(crq->event);
2565         struct ibmvfc_target *tgt;
2566
2567         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2568                    " node_name: %llx%s\n", desc->desc, crq->scsi_id, crq->wwpn, crq->node_name,
2569                    ibmvfc_get_link_state(crq->link_state));
2570
2571         switch (crq->event) {
2572         case IBMVFC_AE_RESUME:
2573                 switch (crq->link_state) {
2574                 case IBMVFC_AE_LS_LINK_DOWN:
2575                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2576                         break;
2577                 case IBMVFC_AE_LS_LINK_DEAD:
2578                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2579                         break;
2580                 case IBMVFC_AE_LS_LINK_UP:
2581                 case IBMVFC_AE_LS_LINK_BOUNCED:
2582                 default:
2583                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2584                         vhost->delay_init = 1;
2585                         __ibmvfc_reset_host(vhost);
2586                         break;
2587                 };
2588
2589                 break;
2590         case IBMVFC_AE_LINK_UP:
2591                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2592                 vhost->delay_init = 1;
2593                 __ibmvfc_reset_host(vhost);
2594                 break;
2595         case IBMVFC_AE_SCN_FABRIC:
2596         case IBMVFC_AE_SCN_DOMAIN:
2597                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2598                 vhost->delay_init = 1;
2599                 __ibmvfc_reset_host(vhost);
2600                 break;
2601         case IBMVFC_AE_SCN_NPORT:
2602         case IBMVFC_AE_SCN_GROUP:
2603                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2604                 ibmvfc_reinit_host(vhost);
2605                 break;
2606         case IBMVFC_AE_ELS_LOGO:
2607         case IBMVFC_AE_ELS_PRLO:
2608         case IBMVFC_AE_ELS_PLOGI:
2609                 list_for_each_entry(tgt, &vhost->targets, queue) {
2610                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2611                                 break;
2612                         if (crq->scsi_id && tgt->scsi_id != crq->scsi_id)
2613                                 continue;
2614                         if (crq->wwpn && tgt->ids.port_name != crq->wwpn)
2615                                 continue;
2616                         if (crq->node_name && tgt->ids.node_name != crq->node_name)
2617                                 continue;
2618                         if (tgt->need_login && crq->event == IBMVFC_AE_ELS_LOGO)
2619                                 tgt->logo_rcvd = 1;
2620                         if (!tgt->need_login || crq->event == IBMVFC_AE_ELS_PLOGI) {
2621                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2622                                 ibmvfc_reinit_host(vhost);
2623                         }
2624                 }
2625                 break;
2626         case IBMVFC_AE_LINK_DOWN:
2627         case IBMVFC_AE_ADAPTER_FAILED:
2628                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2629                 break;
2630         case IBMVFC_AE_LINK_DEAD:
2631                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2632                 break;
2633         case IBMVFC_AE_HALT:
2634                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2635                 break;
2636         default:
2637                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2638                 break;
2639         };
2640 }
2641
2642 /**
2643  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2644  * @crq:        Command/Response queue
2645  * @vhost:      ibmvfc host struct
2646  *
2647  **/
2648 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2649 {
2650         long rc;
2651         struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
2652
2653         switch (crq->valid) {
2654         case IBMVFC_CRQ_INIT_RSP:
2655                 switch (crq->format) {
2656                 case IBMVFC_CRQ_INIT:
2657                         dev_info(vhost->dev, "Partner initialized\n");
2658                         /* Send back a response */
2659                         rc = ibmvfc_send_crq_init_complete(vhost);
2660                         if (rc == 0)
2661                                 ibmvfc_init_host(vhost);
2662                         else
2663                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2664                         break;
2665                 case IBMVFC_CRQ_INIT_COMPLETE:
2666                         dev_info(vhost->dev, "Partner initialization complete\n");
2667                         ibmvfc_init_host(vhost);
2668                         break;
2669                 default:
2670                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2671                 }
2672                 return;
2673         case IBMVFC_CRQ_XPORT_EVENT:
2674                 vhost->state = IBMVFC_NO_CRQ;
2675                 vhost->logged_in = 0;
2676                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2677                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2678                         /* We need to re-setup the interpartition connection */
2679                         dev_info(vhost->dev, "Re-enabling adapter\n");
2680                         vhost->client_migrated = 1;
2681                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2682                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2683                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2684                 } else {
2685                         dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2686                         ibmvfc_purge_requests(vhost, DID_ERROR);
2687                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2688                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2689                 }
2690                 return;
2691         case IBMVFC_CRQ_CMD_RSP:
2692                 break;
2693         default:
2694                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2695                 return;
2696         }
2697
2698         if (crq->format == IBMVFC_ASYNC_EVENT)
2699                 return;
2700
2701         /* The only kind of payload CRQs we should get are responses to
2702          * things we send. Make sure this response is to something we
2703          * actually sent
2704          */
2705         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2706                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2707                         crq->ioba);
2708                 return;
2709         }
2710
2711         if (unlikely(atomic_read(&evt->free))) {
2712                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2713                         crq->ioba);
2714                 return;
2715         }
2716
2717         del_timer(&evt->timer);
2718         list_del(&evt->queue);
2719         ibmvfc_trc_end(evt);
2720         evt->done(evt);
2721 }
2722
2723 /**
2724  * ibmvfc_scan_finished - Check if the device scan is done.
2725  * @shost:      scsi host struct
2726  * @time:       current elapsed time
2727  *
2728  * Returns:
2729  *      0 if scan is not done / 1 if scan is done
2730  **/
2731 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2732 {
2733         unsigned long flags;
2734         struct ibmvfc_host *vhost = shost_priv(shost);
2735         int done = 0;
2736
2737         spin_lock_irqsave(shost->host_lock, flags);
2738         if (time >= (init_timeout * HZ)) {
2739                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2740                          "continuing initialization\n", init_timeout);
2741                 done = 1;
2742         }
2743
2744         if (vhost->scan_complete)
2745                 done = 1;
2746         spin_unlock_irqrestore(shost->host_lock, flags);
2747         return done;
2748 }
2749
2750 /**
2751  * ibmvfc_slave_alloc - Setup the device's task set value
2752  * @sdev:       struct scsi_device device to configure
2753  *
2754  * Set the device's task set value so that error handling works as
2755  * expected.
2756  *
2757  * Returns:
2758  *      0 on success / -ENXIO if device does not exist
2759  **/
2760 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2761 {
2762         struct Scsi_Host *shost = sdev->host;
2763         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2764         struct ibmvfc_host *vhost = shost_priv(shost);
2765         unsigned long flags = 0;
2766
2767         if (!rport || fc_remote_port_chkready(rport))
2768                 return -ENXIO;
2769
2770         spin_lock_irqsave(shost->host_lock, flags);
2771         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2772         spin_unlock_irqrestore(shost->host_lock, flags);
2773         return 0;
2774 }
2775
2776 /**
2777  * ibmvfc_target_alloc - Setup the target's task set value
2778  * @starget:    struct scsi_target
2779  *
2780  * Set the target's task set value so that error handling works as
2781  * expected.
2782  *
2783  * Returns:
2784  *      0 on success / -ENXIO if device does not exist
2785  **/
2786 static int ibmvfc_target_alloc(struct scsi_target *starget)
2787 {
2788         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2789         struct ibmvfc_host *vhost = shost_priv(shost);
2790         unsigned long flags = 0;
2791
2792         spin_lock_irqsave(shost->host_lock, flags);
2793         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2794         spin_unlock_irqrestore(shost->host_lock, flags);
2795         return 0;
2796 }
2797
2798 /**
2799  * ibmvfc_slave_configure - Configure the device
2800  * @sdev:       struct scsi_device device to configure
2801  *
2802  * Enable allow_restart for a device if it is a disk. Adjust the
2803  * queue_depth here also.
2804  *
2805  * Returns:
2806  *      0
2807  **/
2808 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2809 {
2810         struct Scsi_Host *shost = sdev->host;
2811         unsigned long flags = 0;
2812
2813         spin_lock_irqsave(shost->host_lock, flags);
2814         if (sdev->type == TYPE_DISK)
2815                 sdev->allow_restart = 1;
2816
2817         if (sdev->tagged_supported) {
2818                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2819                 scsi_activate_tcq(sdev, sdev->queue_depth);
2820         } else
2821                 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2822         spin_unlock_irqrestore(shost->host_lock, flags);
2823         return 0;
2824 }
2825
2826 /**
2827  * ibmvfc_change_queue_depth - Change the device's queue depth
2828  * @sdev:       scsi device struct
2829  * @qdepth:     depth to set
2830  * @reason:     calling context
2831  *
2832  * Return value:
2833  *      actual depth set
2834  **/
2835 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth,
2836                                      int reason)
2837 {
2838         if (reason != SCSI_QDEPTH_DEFAULT)
2839                 return -EOPNOTSUPP;
2840
2841         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2842                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2843
2844         scsi_adjust_queue_depth(sdev, 0, qdepth);
2845         return sdev->queue_depth;
2846 }
2847
2848 /**
2849  * ibmvfc_change_queue_type - Change the device's queue type
2850  * @sdev:               scsi device struct
2851  * @tag_type:   type of tags to use
2852  *
2853  * Return value:
2854  *      actual queue type set
2855  **/
2856 static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
2857 {
2858         if (sdev->tagged_supported) {
2859                 scsi_set_tag_type(sdev, tag_type);
2860
2861                 if (tag_type)
2862                         scsi_activate_tcq(sdev, sdev->queue_depth);
2863                 else
2864                         scsi_deactivate_tcq(sdev, sdev->queue_depth);
2865         } else
2866                 tag_type = 0;
2867
2868         return tag_type;
2869 }
2870
2871 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2872                                                  struct device_attribute *attr, char *buf)
2873 {
2874         struct Scsi_Host *shost = class_to_shost(dev);
2875         struct ibmvfc_host *vhost = shost_priv(shost);
2876
2877         return snprintf(buf, PAGE_SIZE, "%s\n",
2878                         vhost->login_buf->resp.partition_name);
2879 }
2880
2881 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2882                                             struct device_attribute *attr, char *buf)
2883 {
2884         struct Scsi_Host *shost = class_to_shost(dev);
2885         struct ibmvfc_host *vhost = shost_priv(shost);
2886
2887         return snprintf(buf, PAGE_SIZE, "%s\n",
2888                         vhost->login_buf->resp.device_name);
2889 }
2890
2891 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2892                                          struct device_attribute *attr, char *buf)
2893 {
2894         struct Scsi_Host *shost = class_to_shost(dev);
2895         struct ibmvfc_host *vhost = shost_priv(shost);
2896
2897         return snprintf(buf, PAGE_SIZE, "%s\n",
2898                         vhost->login_buf->resp.port_loc_code);
2899 }
2900
2901 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2902                                          struct device_attribute *attr, char *buf)
2903 {
2904         struct Scsi_Host *shost = class_to_shost(dev);
2905         struct ibmvfc_host *vhost = shost_priv(shost);
2906
2907         return snprintf(buf, PAGE_SIZE, "%s\n",
2908                         vhost->login_buf->resp.drc_name);
2909 }
2910
2911 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2912                                              struct device_attribute *attr, char *buf)
2913 {
2914         struct Scsi_Host *shost = class_to_shost(dev);
2915         struct ibmvfc_host *vhost = shost_priv(shost);
2916         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2917 }
2918
2919 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2920                                              struct device_attribute *attr, char *buf)
2921 {
2922         struct Scsi_Host *shost = class_to_shost(dev);
2923         struct ibmvfc_host *vhost = shost_priv(shost);
2924         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2925 }
2926
2927 /**
2928  * ibmvfc_show_log_level - Show the adapter's error logging level
2929  * @dev:        class device struct
2930  * @buf:        buffer
2931  *
2932  * Return value:
2933  *      number of bytes printed to buffer
2934  **/
2935 static ssize_t ibmvfc_show_log_level(struct device *dev,
2936                                      struct device_attribute *attr, char *buf)
2937 {
2938         struct Scsi_Host *shost = class_to_shost(dev);
2939         struct ibmvfc_host *vhost = shost_priv(shost);
2940         unsigned long flags = 0;
2941         int len;
2942
2943         spin_lock_irqsave(shost->host_lock, flags);
2944         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2945         spin_unlock_irqrestore(shost->host_lock, flags);
2946         return len;
2947 }
2948
2949 /**
2950  * ibmvfc_store_log_level - Change the adapter's error logging level
2951  * @dev:        class device struct
2952  * @buf:        buffer
2953  *
2954  * Return value:
2955  *      number of bytes printed to buffer
2956  **/
2957 static ssize_t ibmvfc_store_log_level(struct device *dev,
2958                                       struct device_attribute *attr,
2959                                       const char *buf, size_t count)
2960 {
2961         struct Scsi_Host *shost = class_to_shost(dev);
2962         struct ibmvfc_host *vhost = shost_priv(shost);
2963         unsigned long flags = 0;
2964
2965         spin_lock_irqsave(shost->host_lock, flags);
2966         vhost->log_level = simple_strtoul(buf, NULL, 10);
2967         spin_unlock_irqrestore(shost->host_lock, flags);
2968         return strlen(buf);
2969 }
2970
2971 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
2972 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
2973 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
2974 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
2975 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
2976 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
2977 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
2978                    ibmvfc_show_log_level, ibmvfc_store_log_level);
2979
2980 #ifdef CONFIG_SCSI_IBMVFC_TRACE
2981 /**
2982  * ibmvfc_read_trace - Dump the adapter trace
2983  * @filp:               open sysfs file
2984  * @kobj:               kobject struct
2985  * @bin_attr:   bin_attribute struct
2986  * @buf:                buffer
2987  * @off:                offset
2988  * @count:              buffer size
2989  *
2990  * Return value:
2991  *      number of bytes printed to buffer
2992  **/
2993 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
2994                                  struct bin_attribute *bin_attr,
2995                                  char *buf, loff_t off, size_t count)
2996 {
2997         struct device *dev = container_of(kobj, struct device, kobj);
2998         struct Scsi_Host *shost = class_to_shost(dev);
2999         struct ibmvfc_host *vhost = shost_priv(shost);
3000         unsigned long flags = 0;
3001         int size = IBMVFC_TRACE_SIZE;
3002         char *src = (char *)vhost->trace;
3003
3004         if (off > size)
3005                 return 0;
3006         if (off + count > size) {
3007                 size -= off;
3008                 count = size;
3009         }
3010
3011         spin_lock_irqsave(shost->host_lock, flags);
3012         memcpy(buf, &src[off], count);
3013         spin_unlock_irqrestore(shost->host_lock, flags);
3014         return count;
3015 }
3016
3017 static struct bin_attribute ibmvfc_trace_attr = {
3018         .attr = {
3019                 .name = "trace",
3020                 .mode = S_IRUGO,
3021         },
3022         .size = 0,
3023         .read = ibmvfc_read_trace,
3024 };
3025 #endif
3026
3027 static struct device_attribute *ibmvfc_attrs[] = {
3028         &dev_attr_partition_name,
3029         &dev_attr_device_name,
3030         &dev_attr_port_loc_code,
3031         &dev_attr_drc_name,
3032         &dev_attr_npiv_version,
3033         &dev_attr_capabilities,
3034         &dev_attr_log_level,
3035         NULL
3036 };
3037
3038 static struct scsi_host_template driver_template = {
3039         .module = THIS_MODULE,
3040         .name = "IBM POWER Virtual FC Adapter",
3041         .proc_name = IBMVFC_NAME,
3042         .queuecommand = ibmvfc_queuecommand,
3043         .eh_abort_handler = ibmvfc_eh_abort_handler,
3044         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3045         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3046         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3047         .slave_alloc = ibmvfc_slave_alloc,
3048         .slave_configure = ibmvfc_slave_configure,
3049         .target_alloc = ibmvfc_target_alloc,
3050         .scan_finished = ibmvfc_scan_finished,
3051         .change_queue_depth = ibmvfc_change_queue_depth,
3052         .change_queue_type = ibmvfc_change_queue_type,
3053         .cmd_per_lun = 16,
3054         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3055         .this_id = -1,
3056         .sg_tablesize = SG_ALL,
3057         .max_sectors = IBMVFC_MAX_SECTORS,
3058         .use_clustering = ENABLE_CLUSTERING,
3059         .shost_attrs = ibmvfc_attrs,
3060 };
3061
3062 /**
3063  * ibmvfc_next_async_crq - Returns the next entry in async queue
3064  * @vhost:      ibmvfc host struct
3065  *
3066  * Returns:
3067  *      Pointer to next entry in queue / NULL if empty
3068  **/
3069 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3070 {
3071         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3072         struct ibmvfc_async_crq *crq;
3073
3074         crq = &async_crq->msgs[async_crq->cur];
3075         if (crq->valid & 0x80) {
3076                 if (++async_crq->cur == async_crq->size)
3077                         async_crq->cur = 0;
3078                 rmb();
3079         } else
3080                 crq = NULL;
3081
3082         return crq;
3083 }
3084
3085 /**
3086  * ibmvfc_next_crq - Returns the next entry in message queue
3087  * @vhost:      ibmvfc host struct
3088  *
3089  * Returns:
3090  *      Pointer to next entry in queue / NULL if empty
3091  **/
3092 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3093 {
3094         struct ibmvfc_crq_queue *queue = &vhost->crq;
3095         struct ibmvfc_crq *crq;
3096
3097         crq = &queue->msgs[queue->cur];
3098         if (crq->valid & 0x80) {
3099                 if (++queue->cur == queue->size)
3100                         queue->cur = 0;
3101                 rmb();
3102         } else
3103                 crq = NULL;
3104
3105         return crq;
3106 }
3107
3108 /**
3109  * ibmvfc_interrupt - Interrupt handler
3110  * @irq:                number of irq to handle, not used
3111  * @dev_instance: ibmvfc_host that received interrupt
3112  *
3113  * Returns:
3114  *      IRQ_HANDLED
3115  **/
3116 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3117 {
3118         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3119         unsigned long flags;
3120
3121         spin_lock_irqsave(vhost->host->host_lock, flags);
3122         vio_disable_interrupts(to_vio_dev(vhost->dev));
3123         tasklet_schedule(&vhost->tasklet);
3124         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3125         return IRQ_HANDLED;
3126 }
3127
3128 /**
3129  * ibmvfc_tasklet - Interrupt handler tasklet
3130  * @data:               ibmvfc host struct
3131  *
3132  * Returns:
3133  *      Nothing
3134  **/
3135 static void ibmvfc_tasklet(void *data)
3136 {
3137         struct ibmvfc_host *vhost = data;
3138         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3139         struct ibmvfc_crq *crq;
3140         struct ibmvfc_async_crq *async;
3141         unsigned long flags;
3142         int done = 0;
3143
3144         spin_lock_irqsave(vhost->host->host_lock, flags);
3145         while (!done) {
3146                 /* Pull all the valid messages off the async CRQ */
3147                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3148                         ibmvfc_handle_async(async, vhost);
3149                         async->valid = 0;
3150                         wmb();
3151                 }
3152
3153                 /* Pull all the valid messages off the CRQ */
3154                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3155                         ibmvfc_handle_crq(crq, vhost);
3156                         crq->valid = 0;
3157                         wmb();
3158                 }
3159
3160                 vio_enable_interrupts(vdev);
3161                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3162                         vio_disable_interrupts(vdev);
3163                         ibmvfc_handle_async(async, vhost);
3164                         async->valid = 0;
3165                         wmb();
3166                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3167                         vio_disable_interrupts(vdev);
3168                         ibmvfc_handle_crq(crq, vhost);
3169                         crq->valid = 0;
3170                         wmb();
3171                 } else
3172                         done = 1;
3173         }
3174
3175         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3176 }
3177
3178 /**
3179  * ibmvfc_init_tgt - Set the next init job step for the target
3180  * @tgt:                ibmvfc target struct
3181  * @job_step:   job step to perform
3182  *
3183  **/
3184 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3185                             void (*job_step) (struct ibmvfc_target *))
3186 {
3187         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3188         tgt->job_step = job_step;
3189         wake_up(&tgt->vhost->work_wait_q);
3190 }
3191
3192 /**
3193  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3194  * @tgt:                ibmvfc target struct
3195  * @job_step:   initialization job step
3196  *
3197  * Returns: 1 if step will be retried / 0 if not
3198  *
3199  **/
3200 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3201                                   void (*job_step) (struct ibmvfc_target *))
3202 {
3203         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3204                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3205                 wake_up(&tgt->vhost->work_wait_q);
3206                 return 0;
3207         } else
3208                 ibmvfc_init_tgt(tgt, job_step);
3209         return 1;
3210 }
3211
3212 /* Defined in FC-LS */
3213 static const struct {
3214         int code;
3215         int retry;
3216         int logged_in;
3217 } prli_rsp [] = {
3218         { 0, 1, 0 },
3219         { 1, 0, 1 },
3220         { 2, 1, 0 },
3221         { 3, 1, 0 },
3222         { 4, 0, 0 },
3223         { 5, 0, 0 },
3224         { 6, 0, 1 },
3225         { 7, 0, 0 },
3226         { 8, 1, 0 },
3227 };
3228
3229 /**
3230  * ibmvfc_get_prli_rsp - Find PRLI response index
3231  * @flags:      PRLI response flags
3232  *
3233  **/
3234 static int ibmvfc_get_prli_rsp(u16 flags)
3235 {
3236         int i;
3237         int code = (flags & 0x0f00) >> 8;
3238
3239         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3240                 if (prli_rsp[i].code == code)
3241                         return i;
3242
3243         return 0;
3244 }
3245
3246 /**
3247  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3248  * @evt:        ibmvfc event struct
3249  *
3250  **/
3251 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3252 {
3253         struct ibmvfc_target *tgt = evt->tgt;
3254         struct ibmvfc_host *vhost = evt->vhost;
3255         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3256         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3257         u32 status = rsp->common.status;
3258         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3259
3260         vhost->discovery_threads--;
3261         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3262         switch (status) {
3263         case IBMVFC_MAD_SUCCESS:
3264                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3265                         parms->type, parms->flags, parms->service_parms);
3266
3267                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3268                         index = ibmvfc_get_prli_rsp(parms->flags);
3269                         if (prli_rsp[index].logged_in) {
3270                                 if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) {
3271                                         tgt->need_login = 0;
3272                                         tgt->ids.roles = 0;
3273                                         if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC)
3274                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3275                                         if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC)
3276                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3277                                         tgt->add_rport = 1;
3278                                 } else
3279                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3280                         } else if (prli_rsp[index].retry)
3281                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3282                         else
3283                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3284                 } else
3285                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3286                 break;
3287         case IBMVFC_MAD_DRIVER_FAILED:
3288                 break;
3289         case IBMVFC_MAD_CRQ_ERROR:
3290                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3291                 break;
3292         case IBMVFC_MAD_FAILED:
3293         default:
3294                 if ((rsp->status & IBMVFC_VIOS_FAILURE) && rsp->error == IBMVFC_PLOGI_REQUIRED)
3295                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3296                 else if (tgt->logo_rcvd)
3297                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3298                 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3299                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3300                 else
3301                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3302
3303                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3304                         ibmvfc_get_cmd_error(rsp->status, rsp->error),
3305                         rsp->status, rsp->error, status);
3306                 break;
3307         };
3308
3309         kref_put(&tgt->kref, ibmvfc_release_tgt);
3310         ibmvfc_free_event(evt);
3311         wake_up(&vhost->work_wait_q);
3312 }
3313
3314 /**
3315  * ibmvfc_tgt_send_prli - Send a process login
3316  * @tgt:        ibmvfc target struct
3317  *
3318  **/
3319 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3320 {
3321         struct ibmvfc_process_login *prli;
3322         struct ibmvfc_host *vhost = tgt->vhost;
3323         struct ibmvfc_event *evt;
3324
3325         if (vhost->discovery_threads >= disc_threads)
3326                 return;
3327
3328         kref_get(&tgt->kref);
3329         evt = ibmvfc_get_event(vhost);
3330         vhost->discovery_threads++;
3331         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3332         evt->tgt = tgt;
3333         prli = &evt->iu.prli;
3334         memset(prli, 0, sizeof(*prli));
3335         prli->common.version = 1;
3336         prli->common.opcode = IBMVFC_PROCESS_LOGIN;
3337         prli->common.length = sizeof(*prli);
3338         prli->scsi_id = tgt->scsi_id;
3339
3340         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3341         prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
3342         prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
3343
3344         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3345         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3346                 vhost->discovery_threads--;
3347                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3348                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3349         } else
3350                 tgt_dbg(tgt, "Sent process login\n");
3351 }
3352
3353 /**
3354  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3355  * @evt:        ibmvfc event struct
3356  *
3357  **/
3358 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3359 {
3360         struct ibmvfc_target *tgt = evt->tgt;
3361         struct ibmvfc_host *vhost = evt->vhost;
3362         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3363         u32 status = rsp->common.status;
3364         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3365
3366         vhost->discovery_threads--;
3367         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3368         switch (status) {
3369         case IBMVFC_MAD_SUCCESS:
3370                 tgt_dbg(tgt, "Port Login succeeded\n");
3371                 if (tgt->ids.port_name &&
3372                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3373                         vhost->reinit = 1;
3374                         tgt_dbg(tgt, "Port re-init required\n");
3375                         break;
3376                 }
3377                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3378                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3379                 tgt->ids.port_id = tgt->scsi_id;
3380                 memcpy(&tgt->service_parms, &rsp->service_parms,
3381                        sizeof(tgt->service_parms));
3382                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3383                        sizeof(tgt->service_parms_change));
3384                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3385                 break;
3386         case IBMVFC_MAD_DRIVER_FAILED:
3387                 break;
3388         case IBMVFC_MAD_CRQ_ERROR:
3389                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3390                 break;
3391         case IBMVFC_MAD_FAILED:
3392         default:
3393                 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3394                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3395                 else
3396                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3397
3398                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3399                         ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3400                         ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3401                         ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
3402                 break;
3403         };
3404
3405         kref_put(&tgt->kref, ibmvfc_release_tgt);
3406         ibmvfc_free_event(evt);
3407         wake_up(&vhost->work_wait_q);
3408 }
3409
3410 /**
3411  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3412  * @tgt:        ibmvfc target struct
3413  *
3414  **/
3415 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3416 {
3417         struct ibmvfc_port_login *plogi;
3418         struct ibmvfc_host *vhost = tgt->vhost;
3419         struct ibmvfc_event *evt;
3420
3421         if (vhost->discovery_threads >= disc_threads)
3422                 return;
3423
3424         kref_get(&tgt->kref);
3425         tgt->logo_rcvd = 0;
3426         evt = ibmvfc_get_event(vhost);
3427         vhost->discovery_threads++;
3428         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3429         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3430         evt->tgt = tgt;
3431         plogi = &evt->iu.plogi;
3432         memset(plogi, 0, sizeof(*plogi));
3433         plogi->common.version = 1;
3434         plogi->common.opcode = IBMVFC_PORT_LOGIN;
3435         plogi->common.length = sizeof(*plogi);
3436         plogi->scsi_id = tgt->scsi_id;
3437
3438         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3439                 vhost->discovery_threads--;
3440                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3441                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3442         } else
3443                 tgt_dbg(tgt, "Sent port login\n");
3444 }
3445
3446 /**
3447  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3448  * @evt:        ibmvfc event struct
3449  *
3450  **/
3451 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3452 {
3453         struct ibmvfc_target *tgt = evt->tgt;
3454         struct ibmvfc_host *vhost = evt->vhost;
3455         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3456         u32 status = rsp->common.status;
3457
3458         vhost->discovery_threads--;
3459         ibmvfc_free_event(evt);
3460         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3461
3462         switch (status) {
3463         case IBMVFC_MAD_SUCCESS:
3464                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3465                 break;
3466         case IBMVFC_MAD_DRIVER_FAILED:
3467                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3468                 wake_up(&vhost->work_wait_q);
3469                 return;
3470         case IBMVFC_MAD_FAILED:
3471         default:
3472                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3473                 break;
3474         };
3475
3476         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3477                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3478         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3479                  tgt->scsi_id != tgt->new_scsi_id)
3480                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3481         kref_put(&tgt->kref, ibmvfc_release_tgt);
3482         wake_up(&vhost->work_wait_q);
3483 }
3484
3485 /**
3486  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3487  * @tgt:                ibmvfc target struct
3488  *
3489  **/
3490 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3491 {
3492         struct ibmvfc_implicit_logout *mad;
3493         struct ibmvfc_host *vhost = tgt->vhost;
3494         struct ibmvfc_event *evt;
3495
3496         if (vhost->discovery_threads >= disc_threads)
3497                 return;
3498
3499         kref_get(&tgt->kref);
3500         evt = ibmvfc_get_event(vhost);
3501         vhost->discovery_threads++;
3502         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3503         evt->tgt = tgt;
3504         mad = &evt->iu.implicit_logout;
3505         memset(mad, 0, sizeof(*mad));
3506         mad->common.version = 1;
3507         mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
3508         mad->common.length = sizeof(*mad);
3509         mad->old_scsi_id = tgt->scsi_id;
3510
3511         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3512         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3513                 vhost->discovery_threads--;
3514                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3515                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3516         } else
3517                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3518 }
3519
3520 /**
3521  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3522  * @mad:        ibmvfc passthru mad struct
3523  * @tgt:        ibmvfc target struct
3524  *
3525  * Returns:
3526  *      1 if PLOGI needed / 0 if PLOGI not needed
3527  **/
3528 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3529                                     struct ibmvfc_target *tgt)
3530 {
3531         if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3532                    sizeof(tgt->ids.port_name)))
3533                 return 1;
3534         if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3535                    sizeof(tgt->ids.node_name)))
3536                 return 1;
3537         if (mad->fc_iu.response[6] != tgt->scsi_id)
3538                 return 1;
3539         return 0;
3540 }
3541
3542 /**
3543  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3544  * @evt:        ibmvfc event struct
3545  *
3546  **/
3547 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3548 {
3549         struct ibmvfc_target *tgt = evt->tgt;
3550         struct ibmvfc_host *vhost = evt->vhost;
3551         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3552         u32 status = mad->common.status;
3553         u8 fc_reason, fc_explain;
3554
3555         vhost->discovery_threads--;
3556         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3557         del_timer(&tgt->timer);
3558
3559         switch (status) {
3560         case IBMVFC_MAD_SUCCESS:
3561                 tgt_dbg(tgt, "ADISC succeeded\n");
3562                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3563                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3564                 break;
3565         case IBMVFC_MAD_DRIVER_FAILED:
3566                 break;
3567         case IBMVFC_MAD_FAILED:
3568         default:
3569                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3570                 fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16;
3571                 fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8;
3572                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3573                          ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error),
3574                          mad->iu.status, mad->iu.error,
3575                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3576                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3577                 break;
3578         };
3579
3580         kref_put(&tgt->kref, ibmvfc_release_tgt);
3581         ibmvfc_free_event(evt);
3582         wake_up(&vhost->work_wait_q);
3583 }
3584
3585 /**
3586  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3587  * @evt:                ibmvfc event struct
3588  *
3589  **/
3590 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3591 {
3592         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3593
3594         memset(mad, 0, sizeof(*mad));
3595         mad->common.version = 1;
3596         mad->common.opcode = IBMVFC_PASSTHRU;
3597         mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
3598         mad->cmd_ioba.va = (u64)evt->crq.ioba +
3599                 offsetof(struct ibmvfc_passthru_mad, iu);
3600         mad->cmd_ioba.len = sizeof(mad->iu);
3601         mad->iu.cmd_len = sizeof(mad->fc_iu.payload);
3602         mad->iu.rsp_len = sizeof(mad->fc_iu.response);
3603         mad->iu.cmd.va = (u64)evt->crq.ioba +
3604                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3605                 offsetof(struct ibmvfc_passthru_fc_iu, payload);
3606         mad->iu.cmd.len = sizeof(mad->fc_iu.payload);
3607         mad->iu.rsp.va = (u64)evt->crq.ioba +
3608                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3609                 offsetof(struct ibmvfc_passthru_fc_iu, response);
3610         mad->iu.rsp.len = sizeof(mad->fc_iu.response);
3611 }
3612
3613 /**
3614  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3615  * @evt:                ibmvfc event struct
3616  *
3617  * Just cleanup this event struct. Everything else is handled by
3618  * the ADISC completion handler. If the ADISC never actually comes
3619  * back, we still have the timer running on the ADISC event struct
3620  * which will fire and cause the CRQ to get reset.
3621  *
3622  **/
3623 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3624 {
3625         struct ibmvfc_host *vhost = evt->vhost;
3626         struct ibmvfc_target *tgt = evt->tgt;
3627
3628         tgt_dbg(tgt, "ADISC cancel complete\n");
3629         vhost->abort_threads--;
3630         ibmvfc_free_event(evt);
3631         kref_put(&tgt->kref, ibmvfc_release_tgt);
3632         wake_up(&vhost->work_wait_q);
3633 }
3634
3635 /**
3636  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3637  * @tgt:                ibmvfc target struct
3638  *
3639  * If an ADISC times out, send a cancel. If the cancel times
3640  * out, reset the CRQ. When the ADISC comes back as cancelled,
3641  * log back into the target.
3642  **/
3643 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3644 {
3645         struct ibmvfc_host *vhost = tgt->vhost;
3646         struct ibmvfc_event *evt;
3647         struct ibmvfc_tmf *tmf;
3648         unsigned long flags;
3649         int rc;
3650
3651         tgt_dbg(tgt, "ADISC timeout\n");
3652         spin_lock_irqsave(vhost->host->host_lock, flags);
3653         if (vhost->abort_threads >= disc_threads ||
3654             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3655             vhost->state != IBMVFC_INITIALIZING ||
3656             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3657                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3658                 return;
3659         }
3660
3661         vhost->abort_threads++;
3662         kref_get(&tgt->kref);
3663         evt = ibmvfc_get_event(vhost);
3664         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3665
3666         evt->tgt = tgt;
3667         tmf = &evt->iu.tmf;
3668         memset(tmf, 0, sizeof(*tmf));
3669         tmf->common.version = 1;
3670         tmf->common.opcode = IBMVFC_TMF_MAD;
3671         tmf->common.length = sizeof(*tmf);
3672         tmf->scsi_id = tgt->scsi_id;
3673         tmf->cancel_key = tgt->cancel_key;
3674
3675         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3676
3677         if (rc) {
3678                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3679                 vhost->abort_threads--;
3680                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3681                 __ibmvfc_reset_host(vhost);
3682         } else
3683                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3684         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3685 }
3686
3687 /**
3688  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3689  * @tgt:                ibmvfc target struct
3690  *
3691  * When sending an ADISC we end up with two timers running. The
3692  * first timer is the timer in the ibmvfc target struct. If this
3693  * fires, we send a cancel to the target. The second timer is the
3694  * timer on the ibmvfc event for the ADISC, which is longer. If that
3695  * fires, it means the ADISC timed out and our attempt to cancel it
3696  * also failed, so we need to reset the CRQ.
3697  **/
3698 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3699 {
3700         struct ibmvfc_passthru_mad *mad;
3701         struct ibmvfc_host *vhost = tgt->vhost;
3702         struct ibmvfc_event *evt;
3703
3704         if (vhost->discovery_threads >= disc_threads)
3705                 return;
3706
3707         kref_get(&tgt->kref);
3708         evt = ibmvfc_get_event(vhost);
3709         vhost->discovery_threads++;
3710         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3711         evt->tgt = tgt;
3712
3713         ibmvfc_init_passthru(evt);
3714         mad = &evt->iu.passthru;
3715         mad->iu.flags = IBMVFC_FC_ELS;
3716         mad->iu.scsi_id = tgt->scsi_id;
3717         mad->iu.cancel_key = tgt->cancel_key;
3718
3719         mad->fc_iu.payload[0] = IBMVFC_ADISC;
3720         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3721                sizeof(vhost->login_buf->resp.port_name));
3722         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3723                sizeof(vhost->login_buf->resp.node_name));
3724         mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
3725
3726         if (timer_pending(&tgt->timer))
3727                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3728         else {
3729                 tgt->timer.data = (unsigned long) tgt;
3730                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3731                 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3732                 add_timer(&tgt->timer);
3733         }
3734
3735         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3736         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3737                 vhost->discovery_threads--;
3738                 del_timer(&tgt->timer);
3739                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3740                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3741         } else
3742                 tgt_dbg(tgt, "Sent ADISC\n");
3743 }
3744
3745 /**
3746  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3747  * @evt:        ibmvfc event struct
3748  *
3749  **/
3750 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3751 {
3752         struct ibmvfc_target *tgt = evt->tgt;
3753         struct ibmvfc_host *vhost = evt->vhost;
3754         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3755         u32 status = rsp->common.status;
3756         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3757
3758         vhost->discovery_threads--;
3759         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3760         switch (status) {
3761         case IBMVFC_MAD_SUCCESS:
3762                 tgt_dbg(tgt, "Query Target succeeded\n");
3763                 tgt->new_scsi_id = rsp->scsi_id;
3764                 if (rsp->scsi_id != tgt->scsi_id)
3765                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3766                 else
3767                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3768                 break;
3769         case IBMVFC_MAD_DRIVER_FAILED:
3770                 break;
3771         case IBMVFC_MAD_CRQ_ERROR:
3772                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3773                 break;
3774         case IBMVFC_MAD_FAILED:
3775         default:
3776                 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3777                     rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3778                     rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
3779                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3780                 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3781                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3782                 else
3783                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3784
3785                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3786                         ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3787                         ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3788                         ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
3789                 break;
3790         };
3791
3792         kref_put(&tgt->kref, ibmvfc_release_tgt);
3793         ibmvfc_free_event(evt);
3794         wake_up(&vhost->work_wait_q);
3795 }
3796
3797 /**
3798  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3799  * @tgt:        ibmvfc target struct
3800  *
3801  **/
3802 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3803 {
3804         struct ibmvfc_query_tgt *query_tgt;
3805         struct ibmvfc_host *vhost = tgt->vhost;
3806         struct ibmvfc_event *evt;
3807
3808         if (vhost->discovery_threads >= disc_threads)
3809                 return;
3810
3811         kref_get(&tgt->kref);
3812         evt = ibmvfc_get_event(vhost);
3813         vhost->discovery_threads++;
3814         evt->tgt = tgt;
3815         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3816         query_tgt = &evt->iu.query_tgt;
3817         memset(query_tgt, 0, sizeof(*query_tgt));
3818         query_tgt->common.version = 1;
3819         query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
3820         query_tgt->common.length = sizeof(*query_tgt);
3821         query_tgt->wwpn = tgt->ids.port_name;
3822
3823         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3824         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3825                 vhost->discovery_threads--;
3826                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3827                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3828         } else
3829                 tgt_dbg(tgt, "Sent Query Target\n");
3830 }
3831
3832 /**
3833  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3834  * @vhost:              ibmvfc host struct
3835  * @scsi_id:    SCSI ID to allocate target for
3836  *
3837  * Returns:
3838  *      0 on success / other on failure
3839  **/
3840 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3841 {
3842         struct ibmvfc_target *tgt;
3843         unsigned long flags;
3844
3845         spin_lock_irqsave(vhost->host->host_lock, flags);
3846         list_for_each_entry(tgt, &vhost->targets, queue) {
3847                 if (tgt->scsi_id == scsi_id) {
3848                         if (tgt->need_login)
3849                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3850                         goto unlock_out;
3851                 }
3852         }
3853         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3854
3855         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3856         if (!tgt) {
3857                 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3858                         scsi_id);
3859                 return -ENOMEM;
3860         }
3861
3862         memset(tgt, 0, sizeof(*tgt));
3863         tgt->scsi_id = scsi_id;
3864         tgt->new_scsi_id = scsi_id;
3865         tgt->vhost = vhost;
3866         tgt->need_login = 1;
3867         tgt->cancel_key = vhost->task_set++;
3868         init_timer(&tgt->timer);
3869         kref_init(&tgt->kref);
3870         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3871         spin_lock_irqsave(vhost->host->host_lock, flags);
3872         list_add_tail(&tgt->queue, &vhost->targets);
3873
3874 unlock_out:
3875         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3876         return 0;
3877 }
3878
3879 /**
3880  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3881  * @vhost:              ibmvfc host struct
3882  *
3883  * Returns:
3884  *      0 on success / other on failure
3885  **/
3886 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3887 {
3888         int i, rc;
3889
3890         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3891                 rc = ibmvfc_alloc_target(vhost,
3892                                          vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
3893
3894         return rc;
3895 }
3896
3897 /**
3898  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3899  * @evt:        ibmvfc event struct
3900  *
3901  **/
3902 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3903 {
3904         struct ibmvfc_host *vhost = evt->vhost;
3905         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3906         u32 mad_status = rsp->common.status;
3907         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3908
3909         switch (mad_status) {
3910         case IBMVFC_MAD_SUCCESS:
3911                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3912                 vhost->num_targets = rsp->num_written;
3913                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3914                 break;
3915         case IBMVFC_MAD_FAILED:
3916                 level += ibmvfc_retry_host_init(vhost);
3917                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3918                            ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3919                 break;
3920         case IBMVFC_MAD_DRIVER_FAILED:
3921                 break;
3922         default:
3923                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3924                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3925                 break;
3926         }
3927
3928         ibmvfc_free_event(evt);
3929         wake_up(&vhost->work_wait_q);
3930 }
3931
3932 /**
3933  * ibmvfc_discover_targets - Send Discover Targets MAD
3934  * @vhost:      ibmvfc host struct
3935  *
3936  **/
3937 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3938 {
3939         struct ibmvfc_discover_targets *mad;
3940         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3941
3942         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3943         mad = &evt->iu.discover_targets;
3944         memset(mad, 0, sizeof(*mad));
3945         mad->common.version = 1;
3946         mad->common.opcode = IBMVFC_DISC_TARGETS;
3947         mad->common.length = sizeof(*mad);
3948         mad->bufflen = vhost->disc_buf_sz;
3949         mad->buffer.va = vhost->disc_buf_dma;
3950         mad->buffer.len = vhost->disc_buf_sz;
3951         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3952
3953         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3954                 ibmvfc_dbg(vhost, "Sent discover targets\n");
3955         else
3956                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3957 }
3958
3959 /**
3960  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
3961  * @evt:        ibmvfc event struct
3962  *
3963  **/
3964 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
3965 {
3966         struct ibmvfc_host *vhost = evt->vhost;
3967         u32 mad_status = evt->xfer_iu->npiv_login.common.status;
3968         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
3969         unsigned int npiv_max_sectors;
3970         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3971
3972         switch (mad_status) {
3973         case IBMVFC_MAD_SUCCESS:
3974                 ibmvfc_free_event(evt);
3975                 break;
3976         case IBMVFC_MAD_FAILED:
3977                 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3978                         level += ibmvfc_retry_host_init(vhost);
3979                 else
3980                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3981                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
3982                            ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3983                 ibmvfc_free_event(evt);
3984                 return;
3985         case IBMVFC_MAD_CRQ_ERROR:
3986                 ibmvfc_retry_host_init(vhost);
3987         case IBMVFC_MAD_DRIVER_FAILED:
3988                 ibmvfc_free_event(evt);
3989                 return;
3990         default:
3991                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
3992                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3993                 ibmvfc_free_event(evt);
3994                 return;
3995         }
3996
3997         vhost->client_migrated = 0;
3998
3999         if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
4000                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4001                         rsp->flags);
4002                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4003                 wake_up(&vhost->work_wait_q);
4004                 return;
4005         }
4006
4007         if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
4008                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4009                         rsp->max_cmds);
4010                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4011                 wake_up(&vhost->work_wait_q);
4012                 return;
4013         }
4014
4015         vhost->logged_in = 1;
4016         npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
4017         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4018                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4019                  rsp->drc_name, npiv_max_sectors);
4020
4021         fc_host_fabric_name(vhost->host) = rsp->node_name;
4022         fc_host_node_name(vhost->host) = rsp->node_name;
4023         fc_host_port_name(vhost->host) = rsp->port_name;
4024         fc_host_port_id(vhost->host) = rsp->scsi_id;
4025         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4026         fc_host_supported_classes(vhost->host) = 0;
4027         if (rsp->service_parms.class1_parms[0] & 0x80000000)
4028                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4029         if (rsp->service_parms.class2_parms[0] & 0x80000000)
4030                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4031         if (rsp->service_parms.class3_parms[0] & 0x80000000)
4032                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4033         fc_host_maxframe_size(vhost->host) =
4034                 rsp->service_parms.common.bb_rcv_sz & 0x0fff;
4035
4036         vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
4037         vhost->host->max_sectors = npiv_max_sectors;
4038         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4039         wake_up(&vhost->work_wait_q);
4040 }
4041
4042 /**
4043  * ibmvfc_npiv_login - Sends NPIV login
4044  * @vhost:      ibmvfc host struct
4045  *
4046  **/
4047 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4048 {
4049         struct ibmvfc_npiv_login_mad *mad;
4050         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4051
4052         ibmvfc_gather_partition_info(vhost);
4053         ibmvfc_set_login_info(vhost);
4054         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4055
4056         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4057         mad = &evt->iu.npiv_login;
4058         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4059         mad->common.version = 1;
4060         mad->common.opcode = IBMVFC_NPIV_LOGIN;
4061         mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
4062         mad->buffer.va = vhost->login_buf_dma;
4063         mad->buffer.len = sizeof(*vhost->login_buf);
4064
4065         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4066
4067         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4068                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4069         else
4070                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4071 };
4072
4073 /**
4074  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4075  * @vhost:              ibmvfc host struct
4076  *
4077  **/
4078 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4079 {
4080         struct ibmvfc_host *vhost = evt->vhost;
4081         u32 mad_status = evt->xfer_iu->npiv_logout.common.status;
4082
4083         ibmvfc_free_event(evt);
4084
4085         switch (mad_status) {
4086         case IBMVFC_MAD_SUCCESS:
4087                 if (list_empty(&vhost->sent) &&
4088                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4089                         ibmvfc_init_host(vhost);
4090                         return;
4091                 }
4092                 break;
4093         case IBMVFC_MAD_FAILED:
4094         case IBMVFC_MAD_NOT_SUPPORTED:
4095         case IBMVFC_MAD_CRQ_ERROR:
4096         case IBMVFC_MAD_DRIVER_FAILED:
4097         default:
4098                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4099                 break;
4100         }
4101
4102         ibmvfc_hard_reset_host(vhost);
4103 }
4104
4105 /**
4106  * ibmvfc_npiv_logout - Issue an NPIV Logout
4107  * @vhost:              ibmvfc host struct
4108  *
4109  **/
4110 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4111 {
4112         struct ibmvfc_npiv_logout_mad *mad;
4113         struct ibmvfc_event *evt;
4114
4115         evt = ibmvfc_get_event(vhost);
4116         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4117
4118         mad = &evt->iu.npiv_logout;
4119         memset(mad, 0, sizeof(*mad));
4120         mad->common.version = 1;
4121         mad->common.opcode = IBMVFC_NPIV_LOGOUT;
4122         mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);
4123
4124         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4125
4126         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4127                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4128         else
4129                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4130 }
4131
4132 /**
4133  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4134  * @vhost:              ibmvfc host struct
4135  *
4136  * Returns:
4137  *      1 if work to do / 0 if not
4138  **/
4139 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4140 {
4141         struct ibmvfc_target *tgt;
4142
4143         list_for_each_entry(tgt, &vhost->targets, queue) {
4144                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4145                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4146                         return 1;
4147         }
4148
4149         return 0;
4150 }
4151
4152 /**
4153  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4154  * @vhost:              ibmvfc host struct
4155  *
4156  * Returns:
4157  *      1 if work to do / 0 if not
4158  **/
4159 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4160 {
4161         struct ibmvfc_target *tgt;
4162
4163         if (kthread_should_stop())
4164                 return 1;
4165         switch (vhost->action) {
4166         case IBMVFC_HOST_ACTION_NONE:
4167         case IBMVFC_HOST_ACTION_INIT_WAIT:
4168         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4169                 return 0;
4170         case IBMVFC_HOST_ACTION_TGT_INIT:
4171         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4172                 if (vhost->discovery_threads == disc_threads)
4173                         return 0;
4174                 list_for_each_entry(tgt, &vhost->targets, queue)
4175                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4176                                 return 1;
4177                 list_for_each_entry(tgt, &vhost->targets, queue)
4178                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4179                                 return 0;
4180                 return 1;
4181         case IBMVFC_HOST_ACTION_LOGO:
4182         case IBMVFC_HOST_ACTION_INIT:
4183         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4184         case IBMVFC_HOST_ACTION_TGT_DEL:
4185         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4186         case IBMVFC_HOST_ACTION_QUERY:
4187         case IBMVFC_HOST_ACTION_RESET:
4188         case IBMVFC_HOST_ACTION_REENABLE:
4189         default:
4190                 break;
4191         };
4192
4193         return 1;
4194 }
4195
4196 /**
4197  * ibmvfc_work_to_do - Is there task level work to do?
4198  * @vhost:              ibmvfc host struct
4199  *
4200  * Returns:
4201  *      1 if work to do / 0 if not
4202  **/
4203 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4204 {
4205         unsigned long flags;
4206         int rc;
4207
4208         spin_lock_irqsave(vhost->host->host_lock, flags);
4209         rc = __ibmvfc_work_to_do(vhost);
4210         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4211         return rc;
4212 }
4213
4214 /**
4215  * ibmvfc_log_ae - Log async events if necessary
4216  * @vhost:              ibmvfc host struct
4217  * @events:             events to log
4218  *
4219  **/
4220 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4221 {
4222         if (events & IBMVFC_AE_RSCN)
4223                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4224         if ((events & IBMVFC_AE_LINKDOWN) &&
4225             vhost->state >= IBMVFC_HALTED)
4226                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4227         if ((events & IBMVFC_AE_LINKUP) &&
4228             vhost->state == IBMVFC_INITIALIZING)
4229                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4230 }
4231
4232 /**
4233  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4234  * @tgt:                ibmvfc target struct
4235  *
4236  **/
4237 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4238 {
4239         struct ibmvfc_host *vhost = tgt->vhost;
4240         struct fc_rport *rport;
4241         unsigned long flags;
4242
4243         tgt_dbg(tgt, "Adding rport\n");
4244         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4245         spin_lock_irqsave(vhost->host->host_lock, flags);
4246
4247         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4248                 tgt_dbg(tgt, "Deleting rport\n");
4249                 list_del(&tgt->queue);
4250                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4251                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4252                 fc_remote_port_delete(rport);
4253                 del_timer_sync(&tgt->timer);
4254                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4255                 return;
4256         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4257                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4258                 return;
4259         }
4260
4261         if (rport) {
4262                 tgt_dbg(tgt, "rport add succeeded\n");
4263                 tgt->rport = rport;
4264                 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
4265                 rport->supported_classes = 0;
4266                 tgt->target_id = rport->scsi_target_id;
4267                 if (tgt->service_parms.class1_parms[0] & 0x80000000)
4268                         rport->supported_classes |= FC_COS_CLASS1;
4269                 if (tgt->service_parms.class2_parms[0] & 0x80000000)
4270                         rport->supported_classes |= FC_COS_CLASS2;
4271                 if (tgt->service_parms.class3_parms[0] & 0x80000000)
4272                         rport->supported_classes |= FC_COS_CLASS3;
4273                 if (rport->rqst_q)
4274                         blk_queue_max_segments(rport->rqst_q, 1);
4275         } else
4276                 tgt_dbg(tgt, "rport add failed\n");
4277         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4278 }
4279
4280 /**
4281  * ibmvfc_do_work - Do task level work
4282  * @vhost:              ibmvfc host struct
4283  *
4284  **/
4285 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4286 {
4287         struct ibmvfc_target *tgt;
4288         unsigned long flags;
4289         struct fc_rport *rport;
4290         int rc;
4291
4292         ibmvfc_log_ae(vhost, vhost->events_to_log);
4293         spin_lock_irqsave(vhost->host->host_lock, flags);
4294         vhost->events_to_log = 0;
4295         switch (vhost->action) {
4296         case IBMVFC_HOST_ACTION_NONE:
4297         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4298         case IBMVFC_HOST_ACTION_INIT_WAIT:
4299                 break;
4300         case IBMVFC_HOST_ACTION_RESET:
4301                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4302                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4303                 rc = ibmvfc_reset_crq(vhost);
4304                 spin_lock_irqsave(vhost->host->host_lock, flags);
4305                 if (rc == H_CLOSED)
4306                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4307                 else if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4308                          (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4309                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4310                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4311                 }
4312                 break;
4313         case IBMVFC_HOST_ACTION_REENABLE:
4314                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4315                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4316                 rc = ibmvfc_reenable_crq_queue(vhost);
4317                 spin_lock_irqsave(vhost->host->host_lock, flags);
4318                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4319                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4320                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4321                 }
4322                 break;
4323         case IBMVFC_HOST_ACTION_LOGO:
4324                 vhost->job_step(vhost);
4325                 break;
4326         case IBMVFC_HOST_ACTION_INIT:
4327                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4328                 if (vhost->delay_init) {
4329                         vhost->delay_init = 0;
4330                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4331                         ssleep(15);
4332                         return;
4333                 } else
4334                         vhost->job_step(vhost);
4335                 break;
4336         case IBMVFC_HOST_ACTION_QUERY:
4337                 list_for_each_entry(tgt, &vhost->targets, queue)
4338                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4339                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4340                 break;
4341         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4342                 list_for_each_entry(tgt, &vhost->targets, queue) {
4343                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4344                                 tgt->job_step(tgt);
4345                                 break;
4346                         }
4347                 }
4348
4349                 if (!ibmvfc_dev_init_to_do(vhost))
4350                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4351                 break;
4352         case IBMVFC_HOST_ACTION_TGT_DEL:
4353         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4354                 list_for_each_entry(tgt, &vhost->targets, queue) {
4355                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4356                                 tgt_dbg(tgt, "Deleting rport\n");
4357                                 rport = tgt->rport;
4358                                 tgt->rport = NULL;
4359                                 list_del(&tgt->queue);
4360                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4361                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4362                                 if (rport)
4363                                         fc_remote_port_delete(rport);
4364                                 del_timer_sync(&tgt->timer);
4365                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4366                                 return;
4367                         }
4368                 }
4369
4370                 if (vhost->state == IBMVFC_INITIALIZING) {
4371                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4372                                 if (vhost->reinit) {
4373                                         vhost->reinit = 0;
4374                                         scsi_block_requests(vhost->host);
4375                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4376                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4377                                 } else {
4378                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4379                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4380                                         wake_up(&vhost->init_wait_q);
4381                                         schedule_work(&vhost->rport_add_work_q);
4382                                         vhost->init_retries = 0;
4383                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4384                                         scsi_unblock_requests(vhost->host);
4385                                 }
4386
4387                                 return;
4388                         } else {
4389                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4390                                 vhost->job_step = ibmvfc_discover_targets;
4391                         }
4392                 } else {
4393                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4394                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4395                         scsi_unblock_requests(vhost->host);
4396                         wake_up(&vhost->init_wait_q);
4397                         return;
4398                 }
4399                 break;
4400         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4401                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4402                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4403                 ibmvfc_alloc_targets(vhost);
4404                 spin_lock_irqsave(vhost->host->host_lock, flags);
4405                 break;
4406         case IBMVFC_HOST_ACTION_TGT_INIT:
4407                 list_for_each_entry(tgt, &vhost->targets, queue) {
4408                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4409                                 tgt->job_step(tgt);
4410                                 break;
4411                         }
4412                 }
4413
4414                 if (!ibmvfc_dev_init_to_do(vhost))
4415                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4416                 break;
4417         default:
4418                 break;
4419         };
4420
4421         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4422 }
4423
4424 /**
4425  * ibmvfc_work - Do task level work
4426  * @data:               ibmvfc host struct
4427  *
4428  * Returns:
4429  *      zero
4430  **/
4431 static int ibmvfc_work(void *data)
4432 {
4433         struct ibmvfc_host *vhost = data;
4434         int rc;
4435
4436         set_user_nice(current, -20);
4437
4438         while (1) {
4439                 rc = wait_event_interruptible(vhost->work_wait_q,
4440                                               ibmvfc_work_to_do(vhost));
4441
4442                 BUG_ON(rc);
4443
4444                 if (kthread_should_stop())
4445                         break;
4446
4447                 ibmvfc_do_work(vhost);
4448         }
4449
4450         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4451         return 0;
4452 }
4453
4454 /**
4455  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4456  * @vhost:      ibmvfc host struct
4457  *
4458  * Allocates a page for messages, maps it for dma, and registers
4459  * the crq with the hypervisor.
4460  *
4461  * Return value:
4462  *      zero on success / other on failure
4463  **/
4464 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4465 {
4466         int rc, retrc = -ENOMEM;
4467         struct device *dev = vhost->dev;
4468         struct vio_dev *vdev = to_vio_dev(dev);
4469         struct ibmvfc_crq_queue *crq = &vhost->crq;
4470
4471         ENTER;
4472         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4473
4474         if (!crq->msgs)
4475                 return -ENOMEM;
4476
4477         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4478         crq->msg_token = dma_map_single(dev, crq->msgs,
4479                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4480
4481         if (dma_mapping_error(dev, crq->msg_token))
4482                 goto map_failed;
4483
4484         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4485                                         crq->msg_token, PAGE_SIZE);
4486
4487         if (rc == H_RESOURCE)
4488                 /* maybe kexecing and resource is busy. try a reset */
4489                 retrc = rc = ibmvfc_reset_crq(vhost);
4490
4491         if (rc == H_CLOSED)
4492                 dev_warn(dev, "Partner adapter not ready\n");
4493         else if (rc) {
4494                 dev_warn(dev, "Error %d opening adapter\n", rc);
4495                 goto reg_crq_failed;
4496         }
4497
4498         retrc = 0;
4499
4500         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4501
4502         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4503                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4504                 goto req_irq_failed;
4505         }
4506
4507         if ((rc = vio_enable_interrupts(vdev))) {
4508                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4509                 goto req_irq_failed;
4510         }
4511
4512         crq->cur = 0;
4513         LEAVE;
4514         return retrc;
4515
4516 req_irq_failed:
4517         tasklet_kill(&vhost->tasklet);
4518         do {
4519                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4520         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4521 reg_crq_failed:
4522         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4523 map_failed:
4524         free_page((unsigned long)crq->msgs);
4525         return retrc;
4526 }
4527
4528 /**
4529  * ibmvfc_free_mem - Free memory for vhost
4530  * @vhost:      ibmvfc host struct
4531  *
4532  * Return value:
4533  *      none
4534  **/
4535 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4536 {
4537         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4538
4539         ENTER;
4540         mempool_destroy(vhost->tgt_pool);
4541         kfree(vhost->trace);
4542         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4543                           vhost->disc_buf_dma);
4544         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4545                           vhost->login_buf, vhost->login_buf_dma);
4546         dma_pool_destroy(vhost->sg_pool);
4547         dma_unmap_single(vhost->dev, async_q->msg_token,
4548                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4549         free_page((unsigned long)async_q->msgs);
4550         LEAVE;
4551 }
4552
4553 /**
4554  * ibmvfc_alloc_mem - Allocate memory for vhost
4555  * @vhost:      ibmvfc host struct
4556  *
4557  * Return value:
4558  *      0 on success / non-zero on failure
4559  **/
4560 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4561 {
4562         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4563         struct device *dev = vhost->dev;
4564
4565         ENTER;
4566         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4567         if (!async_q->msgs) {
4568                 dev_err(dev, "Couldn't allocate async queue.\n");
4569                 goto nomem;
4570         }
4571
4572         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4573         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4574                                             async_q->size * sizeof(*async_q->msgs),
4575                                             DMA_BIDIRECTIONAL);
4576
4577         if (dma_mapping_error(dev, async_q->msg_token)) {
4578                 dev_err(dev, "Failed to map async queue\n");
4579                 goto free_async_crq;
4580         }
4581
4582         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4583                                          SG_ALL * sizeof(struct srp_direct_buf),
4584                                          sizeof(struct srp_direct_buf), 0);
4585
4586         if (!vhost->sg_pool) {
4587                 dev_err(dev, "Failed to allocate sg pool\n");
4588                 goto unmap_async_crq;
4589         }
4590
4591         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4592                                               &vhost->login_buf_dma, GFP_KERNEL);
4593
4594         if (!vhost->login_buf) {
4595                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4596                 goto free_sg_pool;
4597         }
4598
4599         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4600         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4601                                              &vhost->disc_buf_dma, GFP_KERNEL);
4602
4603         if (!vhost->disc_buf) {
4604                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4605                 goto free_login_buffer;
4606         }
4607
4608         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4609                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4610
4611         if (!vhost->trace)
4612                 goto free_disc_buffer;
4613
4614         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4615                                                       sizeof(struct ibmvfc_target));
4616
4617         if (!vhost->tgt_pool) {
4618                 dev_err(dev, "Couldn't allocate target memory pool\n");
4619                 goto free_trace;
4620         }
4621
4622         LEAVE;
4623         return 0;
4624
4625 free_trace:
4626         kfree(vhost->trace);
4627 free_disc_buffer:
4628         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4629                           vhost->disc_buf_dma);
4630 free_login_buffer:
4631         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4632                           vhost->login_buf, vhost->login_buf_dma);
4633 free_sg_pool:
4634         dma_pool_destroy(vhost->sg_pool);
4635 unmap_async_crq:
4636         dma_unmap_single(dev, async_q->msg_token,
4637                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4638 free_async_crq:
4639         free_page((unsigned long)async_q->msgs);
4640 nomem:
4641         LEAVE;
4642         return -ENOMEM;
4643 }
4644
4645 /**
4646  * ibmvfc_rport_add_thread - Worker thread for rport adds
4647  * @work:       work struct
4648  *
4649  **/
4650 static void ibmvfc_rport_add_thread(struct work_struct *work)
4651 {
4652         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4653                                                  rport_add_work_q);
4654         struct ibmvfc_target *tgt;
4655         struct fc_rport *rport;
4656         unsigned long flags;
4657         int did_work;
4658
4659         ENTER;
4660         spin_lock_irqsave(vhost->host->host_lock, flags);
4661         do {
4662                 did_work = 0;
4663                 if (vhost->state != IBMVFC_ACTIVE)
4664                         break;
4665
4666                 list_for_each_entry(tgt, &vhost->targets, queue) {
4667                         if (tgt->add_rport) {
4668                                 did_work = 1;
4669                                 tgt->add_rport = 0;
4670                                 kref_get(&tgt->kref);
4671                                 rport = tgt->rport;
4672                                 if (!rport) {
4673                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4674                                         ibmvfc_tgt_add_rport(tgt);
4675                                 } else if (get_device(&rport->dev)) {
4676                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4677                                         tgt_dbg(tgt, "Setting rport roles\n");
4678                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4679                                         put_device(&rport->dev);
4680                                 }
4681
4682                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4683                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4684                                 break;
4685                         }
4686                 }
4687         } while(did_work);
4688
4689         if (vhost->state == IBMVFC_ACTIVE)
4690                 vhost->scan_complete = 1;
4691         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4692         LEAVE;
4693 }
4694
4695 /**
4696  * ibmvfc_probe - Adapter hot plug add entry point
4697  * @vdev:       vio device struct
4698  * @id: vio device id struct
4699  *
4700  * Return value:
4701  *      0 on success / non-zero on failure
4702  **/
4703 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4704 {
4705         struct ibmvfc_host *vhost;
4706         struct Scsi_Host *shost;
4707         struct device *dev = &vdev->dev;
4708         int rc = -ENOMEM;
4709
4710         ENTER;
4711         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4712         if (!shost) {
4713                 dev_err(dev, "Couldn't allocate host data\n");
4714                 goto out;
4715         }
4716
4717         shost->transportt = ibmvfc_transport_template;
4718         shost->can_queue = max_requests;
4719         shost->max_lun = max_lun;
4720         shost->max_id = max_targets;
4721         shost->max_sectors = IBMVFC_MAX_SECTORS;
4722         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4723         shost->unique_id = shost->host_no;
4724
4725         vhost = shost_priv(shost);
4726         INIT_LIST_HEAD(&vhost->sent);
4727         INIT_LIST_HEAD(&vhost->free);
4728         INIT_LIST_HEAD(&vhost->targets);
4729         sprintf(vhost->name, IBMVFC_NAME);
4730         vhost->host = shost;
4731         vhost->dev = dev;
4732         vhost->partition_number = -1;
4733         vhost->log_level = log_level;
4734         vhost->task_set = 1;
4735         strcpy(vhost->partition_name, "UNKNOWN");
4736         init_waitqueue_head(&vhost->work_wait_q);
4737         init_waitqueue_head(&vhost->init_wait_q);
4738         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4739         mutex_init(&vhost->passthru_mutex);
4740
4741         if ((rc = ibmvfc_alloc_mem(vhost)))
4742                 goto free_scsi_host;
4743
4744         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4745                                          shost->host_no);
4746
4747         if (IS_ERR(vhost->work_thread)) {
4748                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4749                         PTR_ERR(vhost->work_thread));
4750                 goto free_host_mem;
4751         }
4752
4753         if ((rc = ibmvfc_init_crq(vhost))) {
4754                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4755                 goto kill_kthread;
4756         }
4757
4758         if ((rc = ibmvfc_init_event_pool(vhost))) {
4759                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4760                 goto release_crq;
4761         }
4762
4763         if ((rc = scsi_add_host(shost, dev)))
4764                 goto release_event_pool;
4765
4766         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4767
4768         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4769                                            &ibmvfc_trace_attr))) {
4770                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4771                 goto remove_shost;
4772         }
4773
4774         if (shost_to_fc_host(shost)->rqst_q)
4775                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4776         dev_set_drvdata(dev, vhost);
4777         spin_lock(&ibmvfc_driver_lock);
4778         list_add_tail(&vhost->queue, &ibmvfc_head);
4779         spin_unlock(&ibmvfc_driver_lock);
4780
4781         ibmvfc_send_crq_init(vhost);
4782         scsi_scan_host(shost);
4783         return 0;
4784
4785 remove_shost:
4786         scsi_remove_host(shost);
4787 release_event_pool:
4788         ibmvfc_free_event_pool(vhost);
4789 release_crq:
4790         ibmvfc_release_crq_queue(vhost);
4791 kill_kthread:
4792         kthread_stop(vhost->work_thread);
4793 free_host_mem:
4794         ibmvfc_free_mem(vhost);
4795 free_scsi_host:
4796         scsi_host_put(shost);
4797 out:
4798         LEAVE;
4799         return rc;
4800 }
4801
4802 /**
4803  * ibmvfc_remove - Adapter hot plug remove entry point
4804  * @vdev:       vio device struct
4805  *
4806  * Return value:
4807  *      0
4808  **/
4809 static int ibmvfc_remove(struct vio_dev *vdev)
4810 {
4811         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4812         unsigned long flags;
4813
4814         ENTER;
4815         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4816
4817         spin_lock_irqsave(vhost->host->host_lock, flags);
4818         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4819         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4820
4821         ibmvfc_wait_while_resetting(vhost);
4822         ibmvfc_release_crq_queue(vhost);
4823         kthread_stop(vhost->work_thread);
4824         fc_remove_host(vhost->host);
4825         scsi_remove_host(vhost->host);
4826
4827         spin_lock_irqsave(vhost->host->host_lock, flags);
4828         ibmvfc_purge_requests(vhost, DID_ERROR);
4829         ibmvfc_free_event_pool(vhost);
4830         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4831
4832         ibmvfc_free_mem(vhost);
4833         spin_lock(&ibmvfc_driver_lock);
4834         list_del(&vhost->queue);
4835         spin_unlock(&ibmvfc_driver_lock);
4836         scsi_host_put(vhost->host);
4837         LEAVE;
4838         return 0;
4839 }
4840
4841 /**
4842  * ibmvfc_resume - Resume from suspend
4843  * @dev:        device struct
4844  *
4845  * We may have lost an interrupt across suspend/resume, so kick the
4846  * interrupt handler
4847  *
4848  */
4849 static int ibmvfc_resume(struct device *dev)
4850 {
4851         unsigned long flags;
4852         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4853         struct vio_dev *vdev = to_vio_dev(dev);
4854
4855         spin_lock_irqsave(vhost->host->host_lock, flags);
4856         vio_disable_interrupts(vdev);
4857         tasklet_schedule(&vhost->tasklet);
4858         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4859         return 0;
4860 }
4861
4862 /**
4863  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4864  * @vdev:       vio device struct
4865  *
4866  * Return value:
4867  *      Number of bytes the driver will need to DMA map at the same time in
4868  *      order to perform well.
4869  */
4870 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4871 {
4872         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4873         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4874 }
4875
4876 static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
4877         {"fcp", "IBM,vfc-client"},
4878         { "", "" }
4879 };
4880 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4881
4882 static struct dev_pm_ops ibmvfc_pm_ops = {
4883         .resume = ibmvfc_resume
4884 };
4885
4886 static struct vio_driver ibmvfc_driver = {
4887         .id_table = ibmvfc_device_table,
4888         .probe = ibmvfc_probe,
4889         .remove = ibmvfc_remove,
4890         .get_desired_dma = ibmvfc_get_desired_dma,
4891         .driver = {
4892                 .name = IBMVFC_NAME,
4893                 .owner = THIS_MODULE,
4894                 .pm = &ibmvfc_pm_ops,
4895         }
4896 };
4897
4898 static struct fc_function_template ibmvfc_transport_functions = {
4899         .show_host_fabric_name = 1,
4900         .show_host_node_name = 1,
4901         .show_host_port_name = 1,
4902         .show_host_supported_classes = 1,
4903         .show_host_port_type = 1,
4904         .show_host_port_id = 1,
4905         .show_host_maxframe_size = 1,
4906
4907         .get_host_port_state = ibmvfc_get_host_port_state,
4908         .show_host_port_state = 1,
4909
4910         .get_host_speed = ibmvfc_get_host_speed,
4911         .show_host_speed = 1,
4912
4913         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4914         .terminate_rport_io = ibmvfc_terminate_rport_io,
4915
4916         .show_rport_maxframe_size = 1,
4917         .show_rport_supported_classes = 1,
4918
4919         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4920         .show_rport_dev_loss_tmo = 1,
4921
4922         .get_starget_node_name = ibmvfc_get_starget_node_name,
4923         .show_starget_node_name = 1,
4924
4925         .get_starget_port_name = ibmvfc_get_starget_port_name,
4926         .show_starget_port_name = 1,
4927
4928         .get_starget_port_id = ibmvfc_get_starget_port_id,
4929         .show_starget_port_id = 1,
4930
4931         .bsg_request = ibmvfc_bsg_request,
4932         .bsg_timeout = ibmvfc_bsg_timeout,
4933 };
4934
4935 /**
4936  * ibmvfc_module_init - Initialize the ibmvfc module
4937  *
4938  * Return value:
4939  *      0 on success / other on failure
4940  **/
4941 static int __init ibmvfc_module_init(void)
4942 {
4943         int rc;
4944
4945         if (!firmware_has_feature(FW_FEATURE_VIO))
4946                 return -ENODEV;
4947
4948         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4949                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4950
4951         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4952         if (!ibmvfc_transport_template)
4953                 return -ENOMEM;
4954
4955         rc = vio_register_driver(&ibmvfc_driver);
4956         if (rc)
4957                 fc_release_transport(ibmvfc_transport_template);
4958         return rc;
4959 }
4960
4961 /**
4962  * ibmvfc_module_exit - Teardown the ibmvfc module
4963  *
4964  * Return value:
4965  *      nothing
4966  **/
4967 static void __exit ibmvfc_module_exit(void)
4968 {
4969         vio_unregister_driver(&ibmvfc_driver);
4970         fc_release_transport(ibmvfc_transport_template);
4971 }
4972
4973 module_init(ibmvfc_module_init);
4974 module_exit(ibmvfc_module_exit);