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_lck(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 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1676
1677 /**
1678  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1679  * @evt:        ibmvfc event struct
1680  *
1681  **/
1682 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1683 {
1684         /* copy the response back */
1685         if (evt->sync_iu)
1686                 *evt->sync_iu = *evt->xfer_iu;
1687
1688         complete(&evt->comp);
1689 }
1690
1691 /**
1692  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1693  * @evt:        struct ibmvfc_event
1694  *
1695  **/
1696 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1697 {
1698         struct ibmvfc_host *vhost = evt->vhost;
1699
1700         ibmvfc_free_event(evt);
1701         vhost->aborting_passthru = 0;
1702         dev_info(vhost->dev, "Passthru command cancelled\n");
1703 }
1704
1705 /**
1706  * ibmvfc_bsg_timeout - Handle a BSG timeout
1707  * @job:        struct fc_bsg_job that timed out
1708  *
1709  * Returns:
1710  *      0 on success / other on failure
1711  **/
1712 static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
1713 {
1714         struct ibmvfc_host *vhost = shost_priv(job->shost);
1715         unsigned long port_id = (unsigned long)job->dd_data;
1716         struct ibmvfc_event *evt;
1717         struct ibmvfc_tmf *tmf;
1718         unsigned long flags;
1719         int rc;
1720
1721         ENTER;
1722         spin_lock_irqsave(vhost->host->host_lock, flags);
1723         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1724                 __ibmvfc_reset_host(vhost);
1725                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1726                 return 0;
1727         }
1728
1729         vhost->aborting_passthru = 1;
1730         evt = ibmvfc_get_event(vhost);
1731         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1732
1733         tmf = &evt->iu.tmf;
1734         memset(tmf, 0, sizeof(*tmf));
1735         tmf->common.version = 1;
1736         tmf->common.opcode = IBMVFC_TMF_MAD;
1737         tmf->common.length = sizeof(*tmf);
1738         tmf->scsi_id = port_id;
1739         tmf->cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
1740         tmf->my_cancel_key = IBMVFC_INTERNAL_CANCEL_KEY;
1741         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1742
1743         if (rc != 0) {
1744                 vhost->aborting_passthru = 0;
1745                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1746                 rc = -EIO;
1747         } else
1748                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1749                          port_id);
1750
1751         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1752
1753         LEAVE;
1754         return rc;
1755 }
1756
1757 /**
1758  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1759  * @vhost:              struct ibmvfc_host to send command
1760  * @port_id:    port ID to send command
1761  *
1762  * Returns:
1763  *      0 on success / other on failure
1764  **/
1765 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1766 {
1767         struct ibmvfc_port_login *plogi;
1768         struct ibmvfc_target *tgt;
1769         struct ibmvfc_event *evt;
1770         union ibmvfc_iu rsp_iu;
1771         unsigned long flags;
1772         int rc = 0, issue_login = 1;
1773
1774         ENTER;
1775         spin_lock_irqsave(vhost->host->host_lock, flags);
1776         list_for_each_entry(tgt, &vhost->targets, queue) {
1777                 if (tgt->scsi_id == port_id) {
1778                         issue_login = 0;
1779                         break;
1780                 }
1781         }
1782
1783         if (!issue_login)
1784                 goto unlock_out;
1785         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1786                 goto unlock_out;
1787
1788         evt = ibmvfc_get_event(vhost);
1789         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1790         plogi = &evt->iu.plogi;
1791         memset(plogi, 0, sizeof(*plogi));
1792         plogi->common.version = 1;
1793         plogi->common.opcode = IBMVFC_PORT_LOGIN;
1794         plogi->common.length = sizeof(*plogi);
1795         plogi->scsi_id = port_id;
1796         evt->sync_iu = &rsp_iu;
1797         init_completion(&evt->comp);
1798
1799         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1800         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1801
1802         if (rc)
1803                 return -EIO;
1804
1805         wait_for_completion(&evt->comp);
1806
1807         if (rsp_iu.plogi.common.status)
1808                 rc = -EIO;
1809
1810         spin_lock_irqsave(vhost->host->host_lock, flags);
1811         ibmvfc_free_event(evt);
1812 unlock_out:
1813         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1814         LEAVE;
1815         return rc;
1816 }
1817
1818 /**
1819  * ibmvfc_bsg_request - Handle a BSG request
1820  * @job:        struct fc_bsg_job to be executed
1821  *
1822  * Returns:
1823  *      0 on success / other on failure
1824  **/
1825 static int ibmvfc_bsg_request(struct fc_bsg_job *job)
1826 {
1827         struct ibmvfc_host *vhost = shost_priv(job->shost);
1828         struct fc_rport *rport = job->rport;
1829         struct ibmvfc_passthru_mad *mad;
1830         struct ibmvfc_event *evt;
1831         union ibmvfc_iu rsp_iu;
1832         unsigned long flags, port_id = -1;
1833         unsigned int code = job->request->msgcode;
1834         int rc = 0, req_seg, rsp_seg, issue_login = 0;
1835         u32 fc_flags, rsp_len;
1836
1837         ENTER;
1838         job->reply->reply_payload_rcv_len = 0;
1839         if (rport)
1840                 port_id = rport->port_id;
1841
1842         switch (code) {
1843         case FC_BSG_HST_ELS_NOLOGIN:
1844                 port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
1845                         (job->request->rqst_data.h_els.port_id[1] << 8) |
1846                         job->request->rqst_data.h_els.port_id[2];
1847         case FC_BSG_RPT_ELS:
1848                 fc_flags = IBMVFC_FC_ELS;
1849                 break;
1850         case FC_BSG_HST_CT:
1851                 issue_login = 1;
1852                 port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
1853                         (job->request->rqst_data.h_ct.port_id[1] << 8) |
1854                         job->request->rqst_data.h_ct.port_id[2];
1855         case FC_BSG_RPT_CT:
1856                 fc_flags = IBMVFC_FC_CT_IU;
1857                 break;
1858         default:
1859                 return -ENOTSUPP;
1860         };
1861
1862         if (port_id == -1)
1863                 return -EINVAL;
1864         if (!mutex_trylock(&vhost->passthru_mutex))
1865                 return -EBUSY;
1866
1867         job->dd_data = (void *)port_id;
1868         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1869                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1870
1871         if (!req_seg) {
1872                 mutex_unlock(&vhost->passthru_mutex);
1873                 return -ENOMEM;
1874         }
1875
1876         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1877                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1878
1879         if (!rsp_seg) {
1880                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1881                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1882                 mutex_unlock(&vhost->passthru_mutex);
1883                 return -ENOMEM;
1884         }
1885
1886         if (req_seg > 1 || rsp_seg > 1) {
1887                 rc = -EINVAL;
1888                 goto out;
1889         }
1890
1891         if (issue_login)
1892                 rc = ibmvfc_bsg_plogi(vhost, port_id);
1893
1894         spin_lock_irqsave(vhost->host->host_lock, flags);
1895
1896         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1897             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1898                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1899                 goto out;
1900         }
1901
1902         evt = ibmvfc_get_event(vhost);
1903         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1904         mad = &evt->iu.passthru;
1905
1906         memset(mad, 0, sizeof(*mad));
1907         mad->common.version = 1;
1908         mad->common.opcode = IBMVFC_PASSTHRU;
1909         mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
1910
1911         mad->cmd_ioba.va = (u64)evt->crq.ioba +
1912                 offsetof(struct ibmvfc_passthru_mad, iu);
1913         mad->cmd_ioba.len = sizeof(mad->iu);
1914
1915         mad->iu.cmd_len = job->request_payload.payload_len;
1916         mad->iu.rsp_len = job->reply_payload.payload_len;
1917         mad->iu.flags = fc_flags;
1918         mad->iu.cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
1919
1920         mad->iu.cmd.va = sg_dma_address(job->request_payload.sg_list);
1921         mad->iu.cmd.len = sg_dma_len(job->request_payload.sg_list);
1922         mad->iu.rsp.va = sg_dma_address(job->reply_payload.sg_list);
1923         mad->iu.rsp.len = sg_dma_len(job->reply_payload.sg_list);
1924         mad->iu.scsi_id = port_id;
1925         mad->iu.tag = (u64)evt;
1926         rsp_len = mad->iu.rsp.len;
1927
1928         evt->sync_iu = &rsp_iu;
1929         init_completion(&evt->comp);
1930         rc = ibmvfc_send_event(evt, vhost, 0);
1931         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1932
1933         if (rc) {
1934                 rc = -EIO;
1935                 goto out;
1936         }
1937
1938         wait_for_completion(&evt->comp);
1939
1940         if (rsp_iu.passthru.common.status)
1941                 rc = -EIO;
1942         else
1943                 job->reply->reply_payload_rcv_len = rsp_len;
1944
1945         spin_lock_irqsave(vhost->host->host_lock, flags);
1946         ibmvfc_free_event(evt);
1947         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1948         job->reply->result = rc;
1949         job->job_done(job);
1950         rc = 0;
1951 out:
1952         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1953                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
1954         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1955                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1956         mutex_unlock(&vhost->passthru_mutex);
1957         LEAVE;
1958         return rc;
1959 }
1960
1961 /**
1962  * ibmvfc_reset_device - Reset the device with the specified reset type
1963  * @sdev:       scsi device to reset
1964  * @type:       reset type
1965  * @desc:       reset type description for log messages
1966  *
1967  * Returns:
1968  *      0 on success / other on failure
1969  **/
1970 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1971 {
1972         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1973         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1974         struct ibmvfc_cmd *tmf;
1975         struct ibmvfc_event *evt = NULL;
1976         union ibmvfc_iu rsp_iu;
1977         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1978         int rsp_rc = -EBUSY;
1979         unsigned long flags;
1980         int rsp_code = 0;
1981
1982         spin_lock_irqsave(vhost->host->host_lock, flags);
1983         if (vhost->state == IBMVFC_ACTIVE) {
1984                 evt = ibmvfc_get_event(vhost);
1985                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1986
1987                 tmf = &evt->iu.cmd;
1988                 memset(tmf, 0, sizeof(*tmf));
1989                 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1990                 tmf->resp.len = sizeof(tmf->rsp);
1991                 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1992                 tmf->payload_len = sizeof(tmf->iu);
1993                 tmf->resp_len = sizeof(tmf->rsp);
1994                 tmf->cancel_key = (unsigned long)sdev->hostdata;
1995                 tmf->tgt_scsi_id = rport->port_id;
1996                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1997                 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1998                 tmf->iu.tmf_flags = type;
1999                 evt->sync_iu = &rsp_iu;
2000
2001                 init_completion(&evt->comp);
2002                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2003         }
2004         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2005
2006         if (rsp_rc != 0) {
2007                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2008                             desc, rsp_rc);
2009                 return -EIO;
2010         }
2011
2012         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2013         wait_for_completion(&evt->comp);
2014
2015         if (rsp_iu.cmd.status)
2016                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2017
2018         if (rsp_code) {
2019                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2020                         rsp_code = fc_rsp->data.info.rsp_code;
2021
2022                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2023                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2024                             desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
2025                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2026                             fc_rsp->scsi_status);
2027                 rsp_rc = -EIO;
2028         } else
2029                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2030
2031         spin_lock_irqsave(vhost->host->host_lock, flags);
2032         ibmvfc_free_event(evt);
2033         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2034         return rsp_rc;
2035 }
2036
2037 /**
2038  * ibmvfc_match_rport - Match function for specified remote port
2039  * @evt:        ibmvfc event struct
2040  * @device:     device to match (rport)
2041  *
2042  * Returns:
2043  *      1 if event matches rport / 0 if event does not match rport
2044  **/
2045 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2046 {
2047         struct fc_rport *cmd_rport;
2048
2049         if (evt->cmnd) {
2050                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2051                 if (cmd_rport == rport)
2052                         return 1;
2053         }
2054         return 0;
2055 }
2056
2057 /**
2058  * ibmvfc_match_target - Match function for specified target
2059  * @evt:        ibmvfc event struct
2060  * @device:     device to match (starget)
2061  *
2062  * Returns:
2063  *      1 if event matches starget / 0 if event does not match starget
2064  **/
2065 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2066 {
2067         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2068                 return 1;
2069         return 0;
2070 }
2071
2072 /**
2073  * ibmvfc_match_lun - Match function for specified LUN
2074  * @evt:        ibmvfc event struct
2075  * @device:     device to match (sdev)
2076  *
2077  * Returns:
2078  *      1 if event matches sdev / 0 if event does not match sdev
2079  **/
2080 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2081 {
2082         if (evt->cmnd && evt->cmnd->device == device)
2083                 return 1;
2084         return 0;
2085 }
2086
2087 /**
2088  * ibmvfc_wait_for_ops - Wait for ops to complete
2089  * @vhost:      ibmvfc host struct
2090  * @device:     device to match (starget or sdev)
2091  * @match:      match function
2092  *
2093  * Returns:
2094  *      SUCCESS / FAILED
2095  **/
2096 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2097                                int (*match) (struct ibmvfc_event *, void *))
2098 {
2099         struct ibmvfc_event *evt;
2100         DECLARE_COMPLETION_ONSTACK(comp);
2101         int wait;
2102         unsigned long flags;
2103         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2104
2105         ENTER;
2106         do {
2107                 wait = 0;
2108                 spin_lock_irqsave(vhost->host->host_lock, flags);
2109                 list_for_each_entry(evt, &vhost->sent, queue) {
2110                         if (match(evt, device)) {
2111                                 evt->eh_comp = &comp;
2112                                 wait++;
2113                         }
2114                 }
2115                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2116
2117                 if (wait) {
2118                         timeout = wait_for_completion_timeout(&comp, timeout);
2119
2120                         if (!timeout) {
2121                                 wait = 0;
2122                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2123                                 list_for_each_entry(evt, &vhost->sent, queue) {
2124                                         if (match(evt, device)) {
2125                                                 evt->eh_comp = NULL;
2126                                                 wait++;
2127                                         }
2128                                 }
2129                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2130                                 if (wait)
2131                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2132                                 LEAVE;
2133                                 return wait ? FAILED : SUCCESS;
2134                         }
2135                 }
2136         } while (wait);
2137
2138         LEAVE;
2139         return SUCCESS;
2140 }
2141
2142 /**
2143  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2144  * @sdev:       scsi device to cancel commands
2145  * @type:       type of error recovery being performed
2146  *
2147  * This sends a cancel to the VIOS for the specified device. This does
2148  * NOT send any abort to the actual device. That must be done separately.
2149  *
2150  * Returns:
2151  *      0 on success / other on failure
2152  **/
2153 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2154 {
2155         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2156         struct scsi_target *starget = scsi_target(sdev);
2157         struct fc_rport *rport = starget_to_rport(starget);
2158         struct ibmvfc_tmf *tmf;
2159         struct ibmvfc_event *evt, *found_evt;
2160         union ibmvfc_iu rsp;
2161         int rsp_rc = -EBUSY;
2162         unsigned long flags;
2163         u16 status;
2164
2165         ENTER;
2166         spin_lock_irqsave(vhost->host->host_lock, flags);
2167         found_evt = NULL;
2168         list_for_each_entry(evt, &vhost->sent, queue) {
2169                 if (evt->cmnd && evt->cmnd->device == sdev) {
2170                         found_evt = evt;
2171                         break;
2172                 }
2173         }
2174
2175         if (!found_evt) {
2176                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2177                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2178                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2179                 return 0;
2180         }
2181
2182         if (vhost->state == IBMVFC_ACTIVE) {
2183                 evt = ibmvfc_get_event(vhost);
2184                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2185
2186                 tmf = &evt->iu.tmf;
2187                 memset(tmf, 0, sizeof(*tmf));
2188                 tmf->common.version = 1;
2189                 tmf->common.opcode = IBMVFC_TMF_MAD;
2190                 tmf->common.length = sizeof(*tmf);
2191                 tmf->scsi_id = rport->port_id;
2192                 int_to_scsilun(sdev->lun, &tmf->lun);
2193                 tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
2194                 tmf->cancel_key = (unsigned long)sdev->hostdata;
2195                 tmf->my_cancel_key = (unsigned long)starget->hostdata;
2196
2197                 evt->sync_iu = &rsp;
2198                 init_completion(&evt->comp);
2199                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2200         }
2201
2202         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2203
2204         if (rsp_rc != 0) {
2205                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2206                 return -EIO;
2207         }
2208
2209         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2210
2211         wait_for_completion(&evt->comp);
2212         status = rsp.mad_common.status;
2213         spin_lock_irqsave(vhost->host->host_lock, flags);
2214         ibmvfc_free_event(evt);
2215         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2216
2217         if (status != IBMVFC_MAD_SUCCESS) {
2218                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2219                 return -EIO;
2220         }
2221
2222         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2223         return 0;
2224 }
2225
2226 /**
2227  * ibmvfc_match_key - Match function for specified cancel key
2228  * @evt:        ibmvfc event struct
2229  * @key:        cancel key to match
2230  *
2231  * Returns:
2232  *      1 if event matches key / 0 if event does not match key
2233  **/
2234 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2235 {
2236         unsigned long cancel_key = (unsigned long)key;
2237
2238         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2239             evt->iu.cmd.cancel_key == cancel_key)
2240                 return 1;
2241         return 0;
2242 }
2243
2244 /**
2245  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2246  * @sdev:       scsi device to abort commands
2247  *
2248  * This sends an Abort Task Set to the VIOS for the specified device. This does
2249  * NOT send any cancel to the VIOS. That must be done separately.
2250  *
2251  * Returns:
2252  *      0 on success / other on failure
2253  **/
2254 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2255 {
2256         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2257         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2258         struct ibmvfc_cmd *tmf;
2259         struct ibmvfc_event *evt, *found_evt;
2260         union ibmvfc_iu rsp_iu;
2261         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2262         int rc, rsp_rc = -EBUSY;
2263         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2264         int rsp_code = 0;
2265
2266         spin_lock_irqsave(vhost->host->host_lock, flags);
2267         found_evt = NULL;
2268         list_for_each_entry(evt, &vhost->sent, queue) {
2269                 if (evt->cmnd && evt->cmnd->device == sdev) {
2270                         found_evt = evt;
2271                         break;
2272                 }
2273         }
2274
2275         if (!found_evt) {
2276                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2277                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2278                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2279                 return 0;
2280         }
2281
2282         if (vhost->state == IBMVFC_ACTIVE) {
2283                 evt = ibmvfc_get_event(vhost);
2284                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2285
2286                 tmf = &evt->iu.cmd;
2287                 memset(tmf, 0, sizeof(*tmf));
2288                 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
2289                 tmf->resp.len = sizeof(tmf->rsp);
2290                 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
2291                 tmf->payload_len = sizeof(tmf->iu);
2292                 tmf->resp_len = sizeof(tmf->rsp);
2293                 tmf->cancel_key = (unsigned long)sdev->hostdata;
2294                 tmf->tgt_scsi_id = rport->port_id;
2295                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2296                 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
2297                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2298                 evt->sync_iu = &rsp_iu;
2299
2300                 init_completion(&evt->comp);
2301                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2302         }
2303
2304         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2305
2306         if (rsp_rc != 0) {
2307                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2308                 return -EIO;
2309         }
2310
2311         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2312         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2313
2314         if (!timeout) {
2315                 rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2316                 if (!rc) {
2317                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2318                         if (rc == SUCCESS)
2319                                 rc = 0;
2320                 }
2321
2322                 if (rc) {
2323                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2324                         ibmvfc_reset_host(vhost);
2325                         rsp_rc = 0;
2326                         goto out;
2327                 }
2328         }
2329
2330         if (rsp_iu.cmd.status)
2331                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2332
2333         if (rsp_code) {
2334                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2335                         rsp_code = fc_rsp->data.info.rsp_code;
2336
2337                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2338                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2339                             ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
2340                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2341                             fc_rsp->scsi_status);
2342                 rsp_rc = -EIO;
2343         } else
2344                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2345
2346 out:
2347         spin_lock_irqsave(vhost->host->host_lock, flags);
2348         ibmvfc_free_event(evt);
2349         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2350         return rsp_rc;
2351 }
2352
2353 /**
2354  * ibmvfc_eh_abort_handler - Abort a command
2355  * @cmd:        scsi command to abort
2356  *
2357  * Returns:
2358  *      SUCCESS / FAILED
2359  **/
2360 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2361 {
2362         struct scsi_device *sdev = cmd->device;
2363         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2364         int cancel_rc, abort_rc;
2365         int rc = FAILED;
2366
2367         ENTER;
2368         fc_block_scsi_eh(cmd);
2369         ibmvfc_wait_while_resetting(vhost);
2370         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2371         abort_rc = ibmvfc_abort_task_set(sdev);
2372
2373         if (!cancel_rc && !abort_rc)
2374                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2375
2376         LEAVE;
2377         return rc;
2378 }
2379
2380 /**
2381  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2382  * @cmd:        scsi command struct
2383  *
2384  * Returns:
2385  *      SUCCESS / FAILED
2386  **/
2387 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2388 {
2389         struct scsi_device *sdev = cmd->device;
2390         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2391         int cancel_rc, reset_rc;
2392         int rc = FAILED;
2393
2394         ENTER;
2395         fc_block_scsi_eh(cmd);
2396         ibmvfc_wait_while_resetting(vhost);
2397         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2398         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2399
2400         if (!cancel_rc && !reset_rc)
2401                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2402
2403         LEAVE;
2404         return rc;
2405 }
2406
2407 /**
2408  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2409  * @sdev:       scsi device struct
2410  * @data:       return code
2411  *
2412  **/
2413 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2414 {
2415         unsigned long *rc = data;
2416         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2417 }
2418
2419 /**
2420  * ibmvfc_eh_target_reset_handler - Reset the target
2421  * @cmd:        scsi command struct
2422  *
2423  * Returns:
2424  *      SUCCESS / FAILED
2425  **/
2426 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2427 {
2428         struct scsi_device *sdev = cmd->device;
2429         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2430         struct scsi_target *starget = scsi_target(sdev);
2431         int reset_rc;
2432         int rc = FAILED;
2433         unsigned long cancel_rc = 0;
2434
2435         ENTER;
2436         fc_block_scsi_eh(cmd);
2437         ibmvfc_wait_while_resetting(vhost);
2438         starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2439         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2440
2441         if (!cancel_rc && !reset_rc)
2442                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2443
2444         LEAVE;
2445         return rc;
2446 }
2447
2448 /**
2449  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2450  * @cmd:        struct scsi_cmnd having problems
2451  *
2452  **/
2453 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2454 {
2455         int rc;
2456         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2457
2458         fc_block_scsi_eh(cmd);
2459         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2460         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2461         return rc ? FAILED : SUCCESS;
2462 }
2463
2464 /**
2465  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2466  * @rport:              rport struct
2467  *
2468  * Return value:
2469  *      none
2470  **/
2471 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2472 {
2473         struct Scsi_Host *shost = rport_to_shost(rport);
2474         struct ibmvfc_host *vhost = shost_priv(shost);
2475         struct fc_rport *dev_rport;
2476         struct scsi_device *sdev;
2477         unsigned long rc;
2478
2479         ENTER;
2480         shost_for_each_device(sdev, shost) {
2481                 dev_rport = starget_to_rport(scsi_target(sdev));
2482                 if (dev_rport != rport)
2483                         continue;
2484                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2485                 ibmvfc_abort_task_set(sdev);
2486         }
2487
2488         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2489
2490         if (rc == FAILED)
2491                 ibmvfc_issue_fc_host_lip(shost);
2492         LEAVE;
2493 }
2494
2495 static const struct ibmvfc_async_desc ae_desc [] = {
2496         { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2497         { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2498         { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2499         { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2500         { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2501         { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
2502         { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
2503         { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
2504         { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
2505         { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
2506         { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
2507         { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
2508         { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2509 };
2510
2511 static const struct ibmvfc_async_desc unknown_ae = {
2512         "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2513 };
2514
2515 /**
2516  * ibmvfc_get_ae_desc - Get text description for async event
2517  * @ae: async event
2518  *
2519  **/
2520 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2521 {
2522         int i;
2523
2524         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2525                 if (ae_desc[i].ae == ae)
2526                         return &ae_desc[i];
2527
2528         return &unknown_ae;
2529 }
2530
2531 static const struct {
2532         enum ibmvfc_ae_link_state state;
2533         const char *desc;
2534 } link_desc [] = {
2535         { IBMVFC_AE_LS_LINK_UP,         " link up" },
2536         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
2537         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
2538         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
2539 };
2540
2541 /**
2542  * ibmvfc_get_link_state - Get text description for link state
2543  * @state:      link state
2544  *
2545  **/
2546 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2547 {
2548         int i;
2549
2550         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2551                 if (link_desc[i].state == state)
2552                         return link_desc[i].desc;
2553
2554         return "";
2555 }
2556
2557 /**
2558  * ibmvfc_handle_async - Handle an async event from the adapter
2559  * @crq:        crq to process
2560  * @vhost:      ibmvfc host struct
2561  *
2562  **/
2563 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2564                                 struct ibmvfc_host *vhost)
2565 {
2566         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(crq->event);
2567         struct ibmvfc_target *tgt;
2568
2569         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2570                    " node_name: %llx%s\n", desc->desc, crq->scsi_id, crq->wwpn, crq->node_name,
2571                    ibmvfc_get_link_state(crq->link_state));
2572
2573         switch (crq->event) {
2574         case IBMVFC_AE_RESUME:
2575                 switch (crq->link_state) {
2576                 case IBMVFC_AE_LS_LINK_DOWN:
2577                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2578                         break;
2579                 case IBMVFC_AE_LS_LINK_DEAD:
2580                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2581                         break;
2582                 case IBMVFC_AE_LS_LINK_UP:
2583                 case IBMVFC_AE_LS_LINK_BOUNCED:
2584                 default:
2585                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2586                         vhost->delay_init = 1;
2587                         __ibmvfc_reset_host(vhost);
2588                         break;
2589                 };
2590
2591                 break;
2592         case IBMVFC_AE_LINK_UP:
2593                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2594                 vhost->delay_init = 1;
2595                 __ibmvfc_reset_host(vhost);
2596                 break;
2597         case IBMVFC_AE_SCN_FABRIC:
2598         case IBMVFC_AE_SCN_DOMAIN:
2599                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2600                 vhost->delay_init = 1;
2601                 __ibmvfc_reset_host(vhost);
2602                 break;
2603         case IBMVFC_AE_SCN_NPORT:
2604         case IBMVFC_AE_SCN_GROUP:
2605                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2606                 ibmvfc_reinit_host(vhost);
2607                 break;
2608         case IBMVFC_AE_ELS_LOGO:
2609         case IBMVFC_AE_ELS_PRLO:
2610         case IBMVFC_AE_ELS_PLOGI:
2611                 list_for_each_entry(tgt, &vhost->targets, queue) {
2612                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2613                                 break;
2614                         if (crq->scsi_id && tgt->scsi_id != crq->scsi_id)
2615                                 continue;
2616                         if (crq->wwpn && tgt->ids.port_name != crq->wwpn)
2617                                 continue;
2618                         if (crq->node_name && tgt->ids.node_name != crq->node_name)
2619                                 continue;
2620                         if (tgt->need_login && crq->event == IBMVFC_AE_ELS_LOGO)
2621                                 tgt->logo_rcvd = 1;
2622                         if (!tgt->need_login || crq->event == IBMVFC_AE_ELS_PLOGI) {
2623                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2624                                 ibmvfc_reinit_host(vhost);
2625                         }
2626                 }
2627                 break;
2628         case IBMVFC_AE_LINK_DOWN:
2629         case IBMVFC_AE_ADAPTER_FAILED:
2630                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2631                 break;
2632         case IBMVFC_AE_LINK_DEAD:
2633                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2634                 break;
2635         case IBMVFC_AE_HALT:
2636                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2637                 break;
2638         default:
2639                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2640                 break;
2641         };
2642 }
2643
2644 /**
2645  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2646  * @crq:        Command/Response queue
2647  * @vhost:      ibmvfc host struct
2648  *
2649  **/
2650 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2651 {
2652         long rc;
2653         struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
2654
2655         switch (crq->valid) {
2656         case IBMVFC_CRQ_INIT_RSP:
2657                 switch (crq->format) {
2658                 case IBMVFC_CRQ_INIT:
2659                         dev_info(vhost->dev, "Partner initialized\n");
2660                         /* Send back a response */
2661                         rc = ibmvfc_send_crq_init_complete(vhost);
2662                         if (rc == 0)
2663                                 ibmvfc_init_host(vhost);
2664                         else
2665                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2666                         break;
2667                 case IBMVFC_CRQ_INIT_COMPLETE:
2668                         dev_info(vhost->dev, "Partner initialization complete\n");
2669                         ibmvfc_init_host(vhost);
2670                         break;
2671                 default:
2672                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2673                 }
2674                 return;
2675         case IBMVFC_CRQ_XPORT_EVENT:
2676                 vhost->state = IBMVFC_NO_CRQ;
2677                 vhost->logged_in = 0;
2678                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2679                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2680                         /* We need to re-setup the interpartition connection */
2681                         dev_info(vhost->dev, "Re-enabling adapter\n");
2682                         vhost->client_migrated = 1;
2683                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2684                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2685                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2686                 } else {
2687                         dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2688                         ibmvfc_purge_requests(vhost, DID_ERROR);
2689                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2690                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2691                 }
2692                 return;
2693         case IBMVFC_CRQ_CMD_RSP:
2694                 break;
2695         default:
2696                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2697                 return;
2698         }
2699
2700         if (crq->format == IBMVFC_ASYNC_EVENT)
2701                 return;
2702
2703         /* The only kind of payload CRQs we should get are responses to
2704          * things we send. Make sure this response is to something we
2705          * actually sent
2706          */
2707         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2708                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2709                         crq->ioba);
2710                 return;
2711         }
2712
2713         if (unlikely(atomic_read(&evt->free))) {
2714                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2715                         crq->ioba);
2716                 return;
2717         }
2718
2719         del_timer(&evt->timer);
2720         list_del(&evt->queue);
2721         ibmvfc_trc_end(evt);
2722         evt->done(evt);
2723 }
2724
2725 /**
2726  * ibmvfc_scan_finished - Check if the device scan is done.
2727  * @shost:      scsi host struct
2728  * @time:       current elapsed time
2729  *
2730  * Returns:
2731  *      0 if scan is not done / 1 if scan is done
2732  **/
2733 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2734 {
2735         unsigned long flags;
2736         struct ibmvfc_host *vhost = shost_priv(shost);
2737         int done = 0;
2738
2739         spin_lock_irqsave(shost->host_lock, flags);
2740         if (time >= (init_timeout * HZ)) {
2741                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2742                          "continuing initialization\n", init_timeout);
2743                 done = 1;
2744         }
2745
2746         if (vhost->scan_complete)
2747                 done = 1;
2748         spin_unlock_irqrestore(shost->host_lock, flags);
2749         return done;
2750 }
2751
2752 /**
2753  * ibmvfc_slave_alloc - Setup the device's task set value
2754  * @sdev:       struct scsi_device device to configure
2755  *
2756  * Set the device's task set value so that error handling works as
2757  * expected.
2758  *
2759  * Returns:
2760  *      0 on success / -ENXIO if device does not exist
2761  **/
2762 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2763 {
2764         struct Scsi_Host *shost = sdev->host;
2765         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2766         struct ibmvfc_host *vhost = shost_priv(shost);
2767         unsigned long flags = 0;
2768
2769         if (!rport || fc_remote_port_chkready(rport))
2770                 return -ENXIO;
2771
2772         spin_lock_irqsave(shost->host_lock, flags);
2773         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2774         spin_unlock_irqrestore(shost->host_lock, flags);
2775         return 0;
2776 }
2777
2778 /**
2779  * ibmvfc_target_alloc - Setup the target's task set value
2780  * @starget:    struct scsi_target
2781  *
2782  * Set the target's task set value so that error handling works as
2783  * expected.
2784  *
2785  * Returns:
2786  *      0 on success / -ENXIO if device does not exist
2787  **/
2788 static int ibmvfc_target_alloc(struct scsi_target *starget)
2789 {
2790         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2791         struct ibmvfc_host *vhost = shost_priv(shost);
2792         unsigned long flags = 0;
2793
2794         spin_lock_irqsave(shost->host_lock, flags);
2795         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2796         spin_unlock_irqrestore(shost->host_lock, flags);
2797         return 0;
2798 }
2799
2800 /**
2801  * ibmvfc_slave_configure - Configure the device
2802  * @sdev:       struct scsi_device device to configure
2803  *
2804  * Enable allow_restart for a device if it is a disk. Adjust the
2805  * queue_depth here also.
2806  *
2807  * Returns:
2808  *      0
2809  **/
2810 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2811 {
2812         struct Scsi_Host *shost = sdev->host;
2813         unsigned long flags = 0;
2814
2815         spin_lock_irqsave(shost->host_lock, flags);
2816         if (sdev->type == TYPE_DISK)
2817                 sdev->allow_restart = 1;
2818
2819         if (sdev->tagged_supported) {
2820                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2821                 scsi_activate_tcq(sdev, sdev->queue_depth);
2822         } else
2823                 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2824         spin_unlock_irqrestore(shost->host_lock, flags);
2825         return 0;
2826 }
2827
2828 /**
2829  * ibmvfc_change_queue_depth - Change the device's queue depth
2830  * @sdev:       scsi device struct
2831  * @qdepth:     depth to set
2832  * @reason:     calling context
2833  *
2834  * Return value:
2835  *      actual depth set
2836  **/
2837 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth,
2838                                      int reason)
2839 {
2840         if (reason != SCSI_QDEPTH_DEFAULT)
2841                 return -EOPNOTSUPP;
2842
2843         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2844                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2845
2846         scsi_adjust_queue_depth(sdev, 0, qdepth);
2847         return sdev->queue_depth;
2848 }
2849
2850 /**
2851  * ibmvfc_change_queue_type - Change the device's queue type
2852  * @sdev:               scsi device struct
2853  * @tag_type:   type of tags to use
2854  *
2855  * Return value:
2856  *      actual queue type set
2857  **/
2858 static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
2859 {
2860         if (sdev->tagged_supported) {
2861                 scsi_set_tag_type(sdev, tag_type);
2862
2863                 if (tag_type)
2864                         scsi_activate_tcq(sdev, sdev->queue_depth);
2865                 else
2866                         scsi_deactivate_tcq(sdev, sdev->queue_depth);
2867         } else
2868                 tag_type = 0;
2869
2870         return tag_type;
2871 }
2872
2873 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2874                                                  struct device_attribute *attr, char *buf)
2875 {
2876         struct Scsi_Host *shost = class_to_shost(dev);
2877         struct ibmvfc_host *vhost = shost_priv(shost);
2878
2879         return snprintf(buf, PAGE_SIZE, "%s\n",
2880                         vhost->login_buf->resp.partition_name);
2881 }
2882
2883 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2884                                             struct device_attribute *attr, char *buf)
2885 {
2886         struct Scsi_Host *shost = class_to_shost(dev);
2887         struct ibmvfc_host *vhost = shost_priv(shost);
2888
2889         return snprintf(buf, PAGE_SIZE, "%s\n",
2890                         vhost->login_buf->resp.device_name);
2891 }
2892
2893 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2894                                          struct device_attribute *attr, char *buf)
2895 {
2896         struct Scsi_Host *shost = class_to_shost(dev);
2897         struct ibmvfc_host *vhost = shost_priv(shost);
2898
2899         return snprintf(buf, PAGE_SIZE, "%s\n",
2900                         vhost->login_buf->resp.port_loc_code);
2901 }
2902
2903 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2904                                          struct device_attribute *attr, char *buf)
2905 {
2906         struct Scsi_Host *shost = class_to_shost(dev);
2907         struct ibmvfc_host *vhost = shost_priv(shost);
2908
2909         return snprintf(buf, PAGE_SIZE, "%s\n",
2910                         vhost->login_buf->resp.drc_name);
2911 }
2912
2913 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2914                                              struct device_attribute *attr, char *buf)
2915 {
2916         struct Scsi_Host *shost = class_to_shost(dev);
2917         struct ibmvfc_host *vhost = shost_priv(shost);
2918         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2919 }
2920
2921 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2922                                              struct device_attribute *attr, char *buf)
2923 {
2924         struct Scsi_Host *shost = class_to_shost(dev);
2925         struct ibmvfc_host *vhost = shost_priv(shost);
2926         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2927 }
2928
2929 /**
2930  * ibmvfc_show_log_level - Show the adapter's error logging level
2931  * @dev:        class device struct
2932  * @buf:        buffer
2933  *
2934  * Return value:
2935  *      number of bytes printed to buffer
2936  **/
2937 static ssize_t ibmvfc_show_log_level(struct device *dev,
2938                                      struct device_attribute *attr, char *buf)
2939 {
2940         struct Scsi_Host *shost = class_to_shost(dev);
2941         struct ibmvfc_host *vhost = shost_priv(shost);
2942         unsigned long flags = 0;
2943         int len;
2944
2945         spin_lock_irqsave(shost->host_lock, flags);
2946         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2947         spin_unlock_irqrestore(shost->host_lock, flags);
2948         return len;
2949 }
2950
2951 /**
2952  * ibmvfc_store_log_level - Change the adapter's error logging level
2953  * @dev:        class device struct
2954  * @buf:        buffer
2955  *
2956  * Return value:
2957  *      number of bytes printed to buffer
2958  **/
2959 static ssize_t ibmvfc_store_log_level(struct device *dev,
2960                                       struct device_attribute *attr,
2961                                       const char *buf, size_t count)
2962 {
2963         struct Scsi_Host *shost = class_to_shost(dev);
2964         struct ibmvfc_host *vhost = shost_priv(shost);
2965         unsigned long flags = 0;
2966
2967         spin_lock_irqsave(shost->host_lock, flags);
2968         vhost->log_level = simple_strtoul(buf, NULL, 10);
2969         spin_unlock_irqrestore(shost->host_lock, flags);
2970         return strlen(buf);
2971 }
2972
2973 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
2974 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
2975 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
2976 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
2977 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
2978 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
2979 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
2980                    ibmvfc_show_log_level, ibmvfc_store_log_level);
2981
2982 #ifdef CONFIG_SCSI_IBMVFC_TRACE
2983 /**
2984  * ibmvfc_read_trace - Dump the adapter trace
2985  * @filp:               open sysfs file
2986  * @kobj:               kobject struct
2987  * @bin_attr:   bin_attribute struct
2988  * @buf:                buffer
2989  * @off:                offset
2990  * @count:              buffer size
2991  *
2992  * Return value:
2993  *      number of bytes printed to buffer
2994  **/
2995 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
2996                                  struct bin_attribute *bin_attr,
2997                                  char *buf, loff_t off, size_t count)
2998 {
2999         struct device *dev = container_of(kobj, struct device, kobj);
3000         struct Scsi_Host *shost = class_to_shost(dev);
3001         struct ibmvfc_host *vhost = shost_priv(shost);
3002         unsigned long flags = 0;
3003         int size = IBMVFC_TRACE_SIZE;
3004         char *src = (char *)vhost->trace;
3005
3006         if (off > size)
3007                 return 0;
3008         if (off + count > size) {
3009                 size -= off;
3010                 count = size;
3011         }
3012
3013         spin_lock_irqsave(shost->host_lock, flags);
3014         memcpy(buf, &src[off], count);
3015         spin_unlock_irqrestore(shost->host_lock, flags);
3016         return count;
3017 }
3018
3019 static struct bin_attribute ibmvfc_trace_attr = {
3020         .attr = {
3021                 .name = "trace",
3022                 .mode = S_IRUGO,
3023         },
3024         .size = 0,
3025         .read = ibmvfc_read_trace,
3026 };
3027 #endif
3028
3029 static struct device_attribute *ibmvfc_attrs[] = {
3030         &dev_attr_partition_name,
3031         &dev_attr_device_name,
3032         &dev_attr_port_loc_code,
3033         &dev_attr_drc_name,
3034         &dev_attr_npiv_version,
3035         &dev_attr_capabilities,
3036         &dev_attr_log_level,
3037         NULL
3038 };
3039
3040 static struct scsi_host_template driver_template = {
3041         .module = THIS_MODULE,
3042         .name = "IBM POWER Virtual FC Adapter",
3043         .proc_name = IBMVFC_NAME,
3044         .queuecommand = ibmvfc_queuecommand,
3045         .eh_abort_handler = ibmvfc_eh_abort_handler,
3046         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3047         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3048         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3049         .slave_alloc = ibmvfc_slave_alloc,
3050         .slave_configure = ibmvfc_slave_configure,
3051         .target_alloc = ibmvfc_target_alloc,
3052         .scan_finished = ibmvfc_scan_finished,
3053         .change_queue_depth = ibmvfc_change_queue_depth,
3054         .change_queue_type = ibmvfc_change_queue_type,
3055         .cmd_per_lun = 16,
3056         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3057         .this_id = -1,
3058         .sg_tablesize = SG_ALL,
3059         .max_sectors = IBMVFC_MAX_SECTORS,
3060         .use_clustering = ENABLE_CLUSTERING,
3061         .shost_attrs = ibmvfc_attrs,
3062 };
3063
3064 /**
3065  * ibmvfc_next_async_crq - Returns the next entry in async queue
3066  * @vhost:      ibmvfc host struct
3067  *
3068  * Returns:
3069  *      Pointer to next entry in queue / NULL if empty
3070  **/
3071 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3072 {
3073         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3074         struct ibmvfc_async_crq *crq;
3075
3076         crq = &async_crq->msgs[async_crq->cur];
3077         if (crq->valid & 0x80) {
3078                 if (++async_crq->cur == async_crq->size)
3079                         async_crq->cur = 0;
3080                 rmb();
3081         } else
3082                 crq = NULL;
3083
3084         return crq;
3085 }
3086
3087 /**
3088  * ibmvfc_next_crq - Returns the next entry in message queue
3089  * @vhost:      ibmvfc host struct
3090  *
3091  * Returns:
3092  *      Pointer to next entry in queue / NULL if empty
3093  **/
3094 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3095 {
3096         struct ibmvfc_crq_queue *queue = &vhost->crq;
3097         struct ibmvfc_crq *crq;
3098
3099         crq = &queue->msgs[queue->cur];
3100         if (crq->valid & 0x80) {
3101                 if (++queue->cur == queue->size)
3102                         queue->cur = 0;
3103                 rmb();
3104         } else
3105                 crq = NULL;
3106
3107         return crq;
3108 }
3109
3110 /**
3111  * ibmvfc_interrupt - Interrupt handler
3112  * @irq:                number of irq to handle, not used
3113  * @dev_instance: ibmvfc_host that received interrupt
3114  *
3115  * Returns:
3116  *      IRQ_HANDLED
3117  **/
3118 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3119 {
3120         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3121         unsigned long flags;
3122
3123         spin_lock_irqsave(vhost->host->host_lock, flags);
3124         vio_disable_interrupts(to_vio_dev(vhost->dev));
3125         tasklet_schedule(&vhost->tasklet);
3126         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3127         return IRQ_HANDLED;
3128 }
3129
3130 /**
3131  * ibmvfc_tasklet - Interrupt handler tasklet
3132  * @data:               ibmvfc host struct
3133  *
3134  * Returns:
3135  *      Nothing
3136  **/
3137 static void ibmvfc_tasklet(void *data)
3138 {
3139         struct ibmvfc_host *vhost = data;
3140         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3141         struct ibmvfc_crq *crq;
3142         struct ibmvfc_async_crq *async;
3143         unsigned long flags;
3144         int done = 0;
3145
3146         spin_lock_irqsave(vhost->host->host_lock, flags);
3147         while (!done) {
3148                 /* Pull all the valid messages off the async CRQ */
3149                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3150                         ibmvfc_handle_async(async, vhost);
3151                         async->valid = 0;
3152                         wmb();
3153                 }
3154
3155                 /* Pull all the valid messages off the CRQ */
3156                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3157                         ibmvfc_handle_crq(crq, vhost);
3158                         crq->valid = 0;
3159                         wmb();
3160                 }
3161
3162                 vio_enable_interrupts(vdev);
3163                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3164                         vio_disable_interrupts(vdev);
3165                         ibmvfc_handle_async(async, vhost);
3166                         async->valid = 0;
3167                         wmb();
3168                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3169                         vio_disable_interrupts(vdev);
3170                         ibmvfc_handle_crq(crq, vhost);
3171                         crq->valid = 0;
3172                         wmb();
3173                 } else
3174                         done = 1;
3175         }
3176
3177         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3178 }
3179
3180 /**
3181  * ibmvfc_init_tgt - Set the next init job step for the target
3182  * @tgt:                ibmvfc target struct
3183  * @job_step:   job step to perform
3184  *
3185  **/
3186 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3187                             void (*job_step) (struct ibmvfc_target *))
3188 {
3189         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3190         tgt->job_step = job_step;
3191         wake_up(&tgt->vhost->work_wait_q);
3192 }
3193
3194 /**
3195  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3196  * @tgt:                ibmvfc target struct
3197  * @job_step:   initialization job step
3198  *
3199  * Returns: 1 if step will be retried / 0 if not
3200  *
3201  **/
3202 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3203                                   void (*job_step) (struct ibmvfc_target *))
3204 {
3205         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3206                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3207                 wake_up(&tgt->vhost->work_wait_q);
3208                 return 0;
3209         } else
3210                 ibmvfc_init_tgt(tgt, job_step);
3211         return 1;
3212 }
3213
3214 /* Defined in FC-LS */
3215 static const struct {
3216         int code;
3217         int retry;
3218         int logged_in;
3219 } prli_rsp [] = {
3220         { 0, 1, 0 },
3221         { 1, 0, 1 },
3222         { 2, 1, 0 },
3223         { 3, 1, 0 },
3224         { 4, 0, 0 },
3225         { 5, 0, 0 },
3226         { 6, 0, 1 },
3227         { 7, 0, 0 },
3228         { 8, 1, 0 },
3229 };
3230
3231 /**
3232  * ibmvfc_get_prli_rsp - Find PRLI response index
3233  * @flags:      PRLI response flags
3234  *
3235  **/
3236 static int ibmvfc_get_prli_rsp(u16 flags)
3237 {
3238         int i;
3239         int code = (flags & 0x0f00) >> 8;
3240
3241         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3242                 if (prli_rsp[i].code == code)
3243                         return i;
3244
3245         return 0;
3246 }
3247
3248 /**
3249  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3250  * @evt:        ibmvfc event struct
3251  *
3252  **/
3253 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3254 {
3255         struct ibmvfc_target *tgt = evt->tgt;
3256         struct ibmvfc_host *vhost = evt->vhost;
3257         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3258         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3259         u32 status = rsp->common.status;
3260         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3261
3262         vhost->discovery_threads--;
3263         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3264         switch (status) {
3265         case IBMVFC_MAD_SUCCESS:
3266                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3267                         parms->type, parms->flags, parms->service_parms);
3268
3269                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3270                         index = ibmvfc_get_prli_rsp(parms->flags);
3271                         if (prli_rsp[index].logged_in) {
3272                                 if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) {
3273                                         tgt->need_login = 0;
3274                                         tgt->ids.roles = 0;
3275                                         if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC)
3276                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3277                                         if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC)
3278                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3279                                         tgt->add_rport = 1;
3280                                 } else
3281                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3282                         } else if (prli_rsp[index].retry)
3283                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3284                         else
3285                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3286                 } else
3287                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3288                 break;
3289         case IBMVFC_MAD_DRIVER_FAILED:
3290                 break;
3291         case IBMVFC_MAD_CRQ_ERROR:
3292                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3293                 break;
3294         case IBMVFC_MAD_FAILED:
3295         default:
3296                 if ((rsp->status & IBMVFC_VIOS_FAILURE) && rsp->error == IBMVFC_PLOGI_REQUIRED)
3297                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3298                 else if (tgt->logo_rcvd)
3299                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3300                 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3301                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3302                 else
3303                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3304
3305                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3306                         ibmvfc_get_cmd_error(rsp->status, rsp->error),
3307                         rsp->status, rsp->error, status);
3308                 break;
3309         };
3310
3311         kref_put(&tgt->kref, ibmvfc_release_tgt);
3312         ibmvfc_free_event(evt);
3313         wake_up(&vhost->work_wait_q);
3314 }
3315
3316 /**
3317  * ibmvfc_tgt_send_prli - Send a process login
3318  * @tgt:        ibmvfc target struct
3319  *
3320  **/
3321 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3322 {
3323         struct ibmvfc_process_login *prli;
3324         struct ibmvfc_host *vhost = tgt->vhost;
3325         struct ibmvfc_event *evt;
3326
3327         if (vhost->discovery_threads >= disc_threads)
3328                 return;
3329
3330         kref_get(&tgt->kref);
3331         evt = ibmvfc_get_event(vhost);
3332         vhost->discovery_threads++;
3333         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3334         evt->tgt = tgt;
3335         prli = &evt->iu.prli;
3336         memset(prli, 0, sizeof(*prli));
3337         prli->common.version = 1;
3338         prli->common.opcode = IBMVFC_PROCESS_LOGIN;
3339         prli->common.length = sizeof(*prli);
3340         prli->scsi_id = tgt->scsi_id;
3341
3342         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3343         prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
3344         prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
3345
3346         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3347         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3348                 vhost->discovery_threads--;
3349                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3350                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3351         } else
3352                 tgt_dbg(tgt, "Sent process login\n");
3353 }
3354
3355 /**
3356  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3357  * @evt:        ibmvfc event struct
3358  *
3359  **/
3360 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3361 {
3362         struct ibmvfc_target *tgt = evt->tgt;
3363         struct ibmvfc_host *vhost = evt->vhost;
3364         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3365         u32 status = rsp->common.status;
3366         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3367
3368         vhost->discovery_threads--;
3369         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3370         switch (status) {
3371         case IBMVFC_MAD_SUCCESS:
3372                 tgt_dbg(tgt, "Port Login succeeded\n");
3373                 if (tgt->ids.port_name &&
3374                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3375                         vhost->reinit = 1;
3376                         tgt_dbg(tgt, "Port re-init required\n");
3377                         break;
3378                 }
3379                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3380                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3381                 tgt->ids.port_id = tgt->scsi_id;
3382                 memcpy(&tgt->service_parms, &rsp->service_parms,
3383                        sizeof(tgt->service_parms));
3384                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3385                        sizeof(tgt->service_parms_change));
3386                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3387                 break;
3388         case IBMVFC_MAD_DRIVER_FAILED:
3389                 break;
3390         case IBMVFC_MAD_CRQ_ERROR:
3391                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3392                 break;
3393         case IBMVFC_MAD_FAILED:
3394         default:
3395                 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3396                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3397                 else
3398                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3399
3400                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3401                         ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3402                         ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3403                         ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
3404                 break;
3405         };
3406
3407         kref_put(&tgt->kref, ibmvfc_release_tgt);
3408         ibmvfc_free_event(evt);
3409         wake_up(&vhost->work_wait_q);
3410 }
3411
3412 /**
3413  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3414  * @tgt:        ibmvfc target struct
3415  *
3416  **/
3417 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3418 {
3419         struct ibmvfc_port_login *plogi;
3420         struct ibmvfc_host *vhost = tgt->vhost;
3421         struct ibmvfc_event *evt;
3422
3423         if (vhost->discovery_threads >= disc_threads)
3424                 return;
3425
3426         kref_get(&tgt->kref);
3427         tgt->logo_rcvd = 0;
3428         evt = ibmvfc_get_event(vhost);
3429         vhost->discovery_threads++;
3430         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3431         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3432         evt->tgt = tgt;
3433         plogi = &evt->iu.plogi;
3434         memset(plogi, 0, sizeof(*plogi));
3435         plogi->common.version = 1;
3436         plogi->common.opcode = IBMVFC_PORT_LOGIN;
3437         plogi->common.length = sizeof(*plogi);
3438         plogi->scsi_id = tgt->scsi_id;
3439
3440         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3441                 vhost->discovery_threads--;
3442                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3443                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3444         } else
3445                 tgt_dbg(tgt, "Sent port login\n");
3446 }
3447
3448 /**
3449  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3450  * @evt:        ibmvfc event struct
3451  *
3452  **/
3453 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3454 {
3455         struct ibmvfc_target *tgt = evt->tgt;
3456         struct ibmvfc_host *vhost = evt->vhost;
3457         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3458         u32 status = rsp->common.status;
3459
3460         vhost->discovery_threads--;
3461         ibmvfc_free_event(evt);
3462         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3463
3464         switch (status) {
3465         case IBMVFC_MAD_SUCCESS:
3466                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3467                 break;
3468         case IBMVFC_MAD_DRIVER_FAILED:
3469                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3470                 wake_up(&vhost->work_wait_q);
3471                 return;
3472         case IBMVFC_MAD_FAILED:
3473         default:
3474                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3475                 break;
3476         };
3477
3478         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3479                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3480         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3481                  tgt->scsi_id != tgt->new_scsi_id)
3482                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3483         kref_put(&tgt->kref, ibmvfc_release_tgt);
3484         wake_up(&vhost->work_wait_q);
3485 }
3486
3487 /**
3488  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3489  * @tgt:                ibmvfc target struct
3490  *
3491  **/
3492 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3493 {
3494         struct ibmvfc_implicit_logout *mad;
3495         struct ibmvfc_host *vhost = tgt->vhost;
3496         struct ibmvfc_event *evt;
3497
3498         if (vhost->discovery_threads >= disc_threads)
3499                 return;
3500
3501         kref_get(&tgt->kref);
3502         evt = ibmvfc_get_event(vhost);
3503         vhost->discovery_threads++;
3504         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3505         evt->tgt = tgt;
3506         mad = &evt->iu.implicit_logout;
3507         memset(mad, 0, sizeof(*mad));
3508         mad->common.version = 1;
3509         mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
3510         mad->common.length = sizeof(*mad);
3511         mad->old_scsi_id = tgt->scsi_id;
3512
3513         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3514         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3515                 vhost->discovery_threads--;
3516                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3517                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3518         } else
3519                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3520 }
3521
3522 /**
3523  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3524  * @mad:        ibmvfc passthru mad struct
3525  * @tgt:        ibmvfc target struct
3526  *
3527  * Returns:
3528  *      1 if PLOGI needed / 0 if PLOGI not needed
3529  **/
3530 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3531                                     struct ibmvfc_target *tgt)
3532 {
3533         if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3534                    sizeof(tgt->ids.port_name)))
3535                 return 1;
3536         if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3537                    sizeof(tgt->ids.node_name)))
3538                 return 1;
3539         if (mad->fc_iu.response[6] != tgt->scsi_id)
3540                 return 1;
3541         return 0;
3542 }
3543
3544 /**
3545  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3546  * @evt:        ibmvfc event struct
3547  *
3548  **/
3549 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3550 {
3551         struct ibmvfc_target *tgt = evt->tgt;
3552         struct ibmvfc_host *vhost = evt->vhost;
3553         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3554         u32 status = mad->common.status;
3555         u8 fc_reason, fc_explain;
3556
3557         vhost->discovery_threads--;
3558         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3559         del_timer(&tgt->timer);
3560
3561         switch (status) {
3562         case IBMVFC_MAD_SUCCESS:
3563                 tgt_dbg(tgt, "ADISC succeeded\n");
3564                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3565                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3566                 break;
3567         case IBMVFC_MAD_DRIVER_FAILED:
3568                 break;
3569         case IBMVFC_MAD_FAILED:
3570         default:
3571                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3572                 fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16;
3573                 fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8;
3574                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3575                          ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error),
3576                          mad->iu.status, mad->iu.error,
3577                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3578                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3579                 break;
3580         };
3581
3582         kref_put(&tgt->kref, ibmvfc_release_tgt);
3583         ibmvfc_free_event(evt);
3584         wake_up(&vhost->work_wait_q);
3585 }
3586
3587 /**
3588  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3589  * @evt:                ibmvfc event struct
3590  *
3591  **/
3592 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3593 {
3594         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3595
3596         memset(mad, 0, sizeof(*mad));
3597         mad->common.version = 1;
3598         mad->common.opcode = IBMVFC_PASSTHRU;
3599         mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
3600         mad->cmd_ioba.va = (u64)evt->crq.ioba +
3601                 offsetof(struct ibmvfc_passthru_mad, iu);
3602         mad->cmd_ioba.len = sizeof(mad->iu);
3603         mad->iu.cmd_len = sizeof(mad->fc_iu.payload);
3604         mad->iu.rsp_len = sizeof(mad->fc_iu.response);
3605         mad->iu.cmd.va = (u64)evt->crq.ioba +
3606                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3607                 offsetof(struct ibmvfc_passthru_fc_iu, payload);
3608         mad->iu.cmd.len = sizeof(mad->fc_iu.payload);
3609         mad->iu.rsp.va = (u64)evt->crq.ioba +
3610                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3611                 offsetof(struct ibmvfc_passthru_fc_iu, response);
3612         mad->iu.rsp.len = sizeof(mad->fc_iu.response);
3613 }
3614
3615 /**
3616  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3617  * @evt:                ibmvfc event struct
3618  *
3619  * Just cleanup this event struct. Everything else is handled by
3620  * the ADISC completion handler. If the ADISC never actually comes
3621  * back, we still have the timer running on the ADISC event struct
3622  * which will fire and cause the CRQ to get reset.
3623  *
3624  **/
3625 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3626 {
3627         struct ibmvfc_host *vhost = evt->vhost;
3628         struct ibmvfc_target *tgt = evt->tgt;
3629
3630         tgt_dbg(tgt, "ADISC cancel complete\n");
3631         vhost->abort_threads--;
3632         ibmvfc_free_event(evt);
3633         kref_put(&tgt->kref, ibmvfc_release_tgt);
3634         wake_up(&vhost->work_wait_q);
3635 }
3636
3637 /**
3638  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3639  * @tgt:                ibmvfc target struct
3640  *
3641  * If an ADISC times out, send a cancel. If the cancel times
3642  * out, reset the CRQ. When the ADISC comes back as cancelled,
3643  * log back into the target.
3644  **/
3645 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3646 {
3647         struct ibmvfc_host *vhost = tgt->vhost;
3648         struct ibmvfc_event *evt;
3649         struct ibmvfc_tmf *tmf;
3650         unsigned long flags;
3651         int rc;
3652
3653         tgt_dbg(tgt, "ADISC timeout\n");
3654         spin_lock_irqsave(vhost->host->host_lock, flags);
3655         if (vhost->abort_threads >= disc_threads ||
3656             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3657             vhost->state != IBMVFC_INITIALIZING ||
3658             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3659                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3660                 return;
3661         }
3662
3663         vhost->abort_threads++;
3664         kref_get(&tgt->kref);
3665         evt = ibmvfc_get_event(vhost);
3666         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3667
3668         evt->tgt = tgt;
3669         tmf = &evt->iu.tmf;
3670         memset(tmf, 0, sizeof(*tmf));
3671         tmf->common.version = 1;
3672         tmf->common.opcode = IBMVFC_TMF_MAD;
3673         tmf->common.length = sizeof(*tmf);
3674         tmf->scsi_id = tgt->scsi_id;
3675         tmf->cancel_key = tgt->cancel_key;
3676
3677         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3678
3679         if (rc) {
3680                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3681                 vhost->abort_threads--;
3682                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3683                 __ibmvfc_reset_host(vhost);
3684         } else
3685                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3686         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3687 }
3688
3689 /**
3690  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3691  * @tgt:                ibmvfc target struct
3692  *
3693  * When sending an ADISC we end up with two timers running. The
3694  * first timer is the timer in the ibmvfc target struct. If this
3695  * fires, we send a cancel to the target. The second timer is the
3696  * timer on the ibmvfc event for the ADISC, which is longer. If that
3697  * fires, it means the ADISC timed out and our attempt to cancel it
3698  * also failed, so we need to reset the CRQ.
3699  **/
3700 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3701 {
3702         struct ibmvfc_passthru_mad *mad;
3703         struct ibmvfc_host *vhost = tgt->vhost;
3704         struct ibmvfc_event *evt;
3705
3706         if (vhost->discovery_threads >= disc_threads)
3707                 return;
3708
3709         kref_get(&tgt->kref);
3710         evt = ibmvfc_get_event(vhost);
3711         vhost->discovery_threads++;
3712         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3713         evt->tgt = tgt;
3714
3715         ibmvfc_init_passthru(evt);
3716         mad = &evt->iu.passthru;
3717         mad->iu.flags = IBMVFC_FC_ELS;
3718         mad->iu.scsi_id = tgt->scsi_id;
3719         mad->iu.cancel_key = tgt->cancel_key;
3720
3721         mad->fc_iu.payload[0] = IBMVFC_ADISC;
3722         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3723                sizeof(vhost->login_buf->resp.port_name));
3724         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3725                sizeof(vhost->login_buf->resp.node_name));
3726         mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
3727
3728         if (timer_pending(&tgt->timer))
3729                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3730         else {
3731                 tgt->timer.data = (unsigned long) tgt;
3732                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3733                 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3734                 add_timer(&tgt->timer);
3735         }
3736
3737         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3738         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3739                 vhost->discovery_threads--;
3740                 del_timer(&tgt->timer);
3741                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3742                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3743         } else
3744                 tgt_dbg(tgt, "Sent ADISC\n");
3745 }
3746
3747 /**
3748  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3749  * @evt:        ibmvfc event struct
3750  *
3751  **/
3752 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3753 {
3754         struct ibmvfc_target *tgt = evt->tgt;
3755         struct ibmvfc_host *vhost = evt->vhost;
3756         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3757         u32 status = rsp->common.status;
3758         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3759
3760         vhost->discovery_threads--;
3761         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3762         switch (status) {
3763         case IBMVFC_MAD_SUCCESS:
3764                 tgt_dbg(tgt, "Query Target succeeded\n");
3765                 tgt->new_scsi_id = rsp->scsi_id;
3766                 if (rsp->scsi_id != tgt->scsi_id)
3767                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3768                 else
3769                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3770                 break;
3771         case IBMVFC_MAD_DRIVER_FAILED:
3772                 break;
3773         case IBMVFC_MAD_CRQ_ERROR:
3774                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3775                 break;
3776         case IBMVFC_MAD_FAILED:
3777         default:
3778                 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3779                     rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3780                     rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
3781                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3782                 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3783                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3784                 else
3785                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3786
3787                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3788                         ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3789                         ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3790                         ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
3791                 break;
3792         };
3793
3794         kref_put(&tgt->kref, ibmvfc_release_tgt);
3795         ibmvfc_free_event(evt);
3796         wake_up(&vhost->work_wait_q);
3797 }
3798
3799 /**
3800  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3801  * @tgt:        ibmvfc target struct
3802  *
3803  **/
3804 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3805 {
3806         struct ibmvfc_query_tgt *query_tgt;
3807         struct ibmvfc_host *vhost = tgt->vhost;
3808         struct ibmvfc_event *evt;
3809
3810         if (vhost->discovery_threads >= disc_threads)
3811                 return;
3812
3813         kref_get(&tgt->kref);
3814         evt = ibmvfc_get_event(vhost);
3815         vhost->discovery_threads++;
3816         evt->tgt = tgt;
3817         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3818         query_tgt = &evt->iu.query_tgt;
3819         memset(query_tgt, 0, sizeof(*query_tgt));
3820         query_tgt->common.version = 1;
3821         query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
3822         query_tgt->common.length = sizeof(*query_tgt);
3823         query_tgt->wwpn = tgt->ids.port_name;
3824
3825         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3826         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3827                 vhost->discovery_threads--;
3828                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3829                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3830         } else
3831                 tgt_dbg(tgt, "Sent Query Target\n");
3832 }
3833
3834 /**
3835  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3836  * @vhost:              ibmvfc host struct
3837  * @scsi_id:    SCSI ID to allocate target for
3838  *
3839  * Returns:
3840  *      0 on success / other on failure
3841  **/
3842 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3843 {
3844         struct ibmvfc_target *tgt;
3845         unsigned long flags;
3846
3847         spin_lock_irqsave(vhost->host->host_lock, flags);
3848         list_for_each_entry(tgt, &vhost->targets, queue) {
3849                 if (tgt->scsi_id == scsi_id) {
3850                         if (tgt->need_login)
3851                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3852                         goto unlock_out;
3853                 }
3854         }
3855         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3856
3857         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3858         if (!tgt) {
3859                 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3860                         scsi_id);
3861                 return -ENOMEM;
3862         }
3863
3864         memset(tgt, 0, sizeof(*tgt));
3865         tgt->scsi_id = scsi_id;
3866         tgt->new_scsi_id = scsi_id;
3867         tgt->vhost = vhost;
3868         tgt->need_login = 1;
3869         tgt->cancel_key = vhost->task_set++;
3870         init_timer(&tgt->timer);
3871         kref_init(&tgt->kref);
3872         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3873         spin_lock_irqsave(vhost->host->host_lock, flags);
3874         list_add_tail(&tgt->queue, &vhost->targets);
3875
3876 unlock_out:
3877         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3878         return 0;
3879 }
3880
3881 /**
3882  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3883  * @vhost:              ibmvfc host struct
3884  *
3885  * Returns:
3886  *      0 on success / other on failure
3887  **/
3888 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3889 {
3890         int i, rc;
3891
3892         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3893                 rc = ibmvfc_alloc_target(vhost,
3894                                          vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
3895
3896         return rc;
3897 }
3898
3899 /**
3900  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3901  * @evt:        ibmvfc event struct
3902  *
3903  **/
3904 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3905 {
3906         struct ibmvfc_host *vhost = evt->vhost;
3907         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3908         u32 mad_status = rsp->common.status;
3909         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3910
3911         switch (mad_status) {
3912         case IBMVFC_MAD_SUCCESS:
3913                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3914                 vhost->num_targets = rsp->num_written;
3915                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3916                 break;
3917         case IBMVFC_MAD_FAILED:
3918                 level += ibmvfc_retry_host_init(vhost);
3919                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3920                            ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3921                 break;
3922         case IBMVFC_MAD_DRIVER_FAILED:
3923                 break;
3924         default:
3925                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3926                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3927                 break;
3928         }
3929
3930         ibmvfc_free_event(evt);
3931         wake_up(&vhost->work_wait_q);
3932 }
3933
3934 /**
3935  * ibmvfc_discover_targets - Send Discover Targets MAD
3936  * @vhost:      ibmvfc host struct
3937  *
3938  **/
3939 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3940 {
3941         struct ibmvfc_discover_targets *mad;
3942         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3943
3944         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3945         mad = &evt->iu.discover_targets;
3946         memset(mad, 0, sizeof(*mad));
3947         mad->common.version = 1;
3948         mad->common.opcode = IBMVFC_DISC_TARGETS;
3949         mad->common.length = sizeof(*mad);
3950         mad->bufflen = vhost->disc_buf_sz;
3951         mad->buffer.va = vhost->disc_buf_dma;
3952         mad->buffer.len = vhost->disc_buf_sz;
3953         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3954
3955         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3956                 ibmvfc_dbg(vhost, "Sent discover targets\n");
3957         else
3958                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3959 }
3960
3961 /**
3962  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
3963  * @evt:        ibmvfc event struct
3964  *
3965  **/
3966 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
3967 {
3968         struct ibmvfc_host *vhost = evt->vhost;
3969         u32 mad_status = evt->xfer_iu->npiv_login.common.status;
3970         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
3971         unsigned int npiv_max_sectors;
3972         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3973
3974         switch (mad_status) {
3975         case IBMVFC_MAD_SUCCESS:
3976                 ibmvfc_free_event(evt);
3977                 break;
3978         case IBMVFC_MAD_FAILED:
3979                 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3980                         level += ibmvfc_retry_host_init(vhost);
3981                 else
3982                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3983                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
3984                            ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3985                 ibmvfc_free_event(evt);
3986                 return;
3987         case IBMVFC_MAD_CRQ_ERROR:
3988                 ibmvfc_retry_host_init(vhost);
3989         case IBMVFC_MAD_DRIVER_FAILED:
3990                 ibmvfc_free_event(evt);
3991                 return;
3992         default:
3993                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
3994                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3995                 ibmvfc_free_event(evt);
3996                 return;
3997         }
3998
3999         vhost->client_migrated = 0;
4000
4001         if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
4002                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4003                         rsp->flags);
4004                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4005                 wake_up(&vhost->work_wait_q);
4006                 return;
4007         }
4008
4009         if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
4010                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4011                         rsp->max_cmds);
4012                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4013                 wake_up(&vhost->work_wait_q);
4014                 return;
4015         }
4016
4017         vhost->logged_in = 1;
4018         npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
4019         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4020                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4021                  rsp->drc_name, npiv_max_sectors);
4022
4023         fc_host_fabric_name(vhost->host) = rsp->node_name;
4024         fc_host_node_name(vhost->host) = rsp->node_name;
4025         fc_host_port_name(vhost->host) = rsp->port_name;
4026         fc_host_port_id(vhost->host) = rsp->scsi_id;
4027         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4028         fc_host_supported_classes(vhost->host) = 0;
4029         if (rsp->service_parms.class1_parms[0] & 0x80000000)
4030                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4031         if (rsp->service_parms.class2_parms[0] & 0x80000000)
4032                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4033         if (rsp->service_parms.class3_parms[0] & 0x80000000)
4034                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4035         fc_host_maxframe_size(vhost->host) =
4036                 rsp->service_parms.common.bb_rcv_sz & 0x0fff;
4037
4038         vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
4039         vhost->host->max_sectors = npiv_max_sectors;
4040         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4041         wake_up(&vhost->work_wait_q);
4042 }
4043
4044 /**
4045  * ibmvfc_npiv_login - Sends NPIV login
4046  * @vhost:      ibmvfc host struct
4047  *
4048  **/
4049 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4050 {
4051         struct ibmvfc_npiv_login_mad *mad;
4052         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4053
4054         ibmvfc_gather_partition_info(vhost);
4055         ibmvfc_set_login_info(vhost);
4056         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4057
4058         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4059         mad = &evt->iu.npiv_login;
4060         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4061         mad->common.version = 1;
4062         mad->common.opcode = IBMVFC_NPIV_LOGIN;
4063         mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
4064         mad->buffer.va = vhost->login_buf_dma;
4065         mad->buffer.len = sizeof(*vhost->login_buf);
4066
4067         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4068
4069         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4070                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4071         else
4072                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4073 };
4074
4075 /**
4076  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4077  * @vhost:              ibmvfc host struct
4078  *
4079  **/
4080 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4081 {
4082         struct ibmvfc_host *vhost = evt->vhost;
4083         u32 mad_status = evt->xfer_iu->npiv_logout.common.status;
4084
4085         ibmvfc_free_event(evt);
4086
4087         switch (mad_status) {
4088         case IBMVFC_MAD_SUCCESS:
4089                 if (list_empty(&vhost->sent) &&
4090                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4091                         ibmvfc_init_host(vhost);
4092                         return;
4093                 }
4094                 break;
4095         case IBMVFC_MAD_FAILED:
4096         case IBMVFC_MAD_NOT_SUPPORTED:
4097         case IBMVFC_MAD_CRQ_ERROR:
4098         case IBMVFC_MAD_DRIVER_FAILED:
4099         default:
4100                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4101                 break;
4102         }
4103
4104         ibmvfc_hard_reset_host(vhost);
4105 }
4106
4107 /**
4108  * ibmvfc_npiv_logout - Issue an NPIV Logout
4109  * @vhost:              ibmvfc host struct
4110  *
4111  **/
4112 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4113 {
4114         struct ibmvfc_npiv_logout_mad *mad;
4115         struct ibmvfc_event *evt;
4116
4117         evt = ibmvfc_get_event(vhost);
4118         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4119
4120         mad = &evt->iu.npiv_logout;
4121         memset(mad, 0, sizeof(*mad));
4122         mad->common.version = 1;
4123         mad->common.opcode = IBMVFC_NPIV_LOGOUT;
4124         mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);
4125
4126         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4127
4128         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4129                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4130         else
4131                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4132 }
4133
4134 /**
4135  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4136  * @vhost:              ibmvfc host struct
4137  *
4138  * Returns:
4139  *      1 if work to do / 0 if not
4140  **/
4141 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4142 {
4143         struct ibmvfc_target *tgt;
4144
4145         list_for_each_entry(tgt, &vhost->targets, queue) {
4146                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4147                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4148                         return 1;
4149         }
4150
4151         return 0;
4152 }
4153
4154 /**
4155  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4156  * @vhost:              ibmvfc host struct
4157  *
4158  * Returns:
4159  *      1 if work to do / 0 if not
4160  **/
4161 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4162 {
4163         struct ibmvfc_target *tgt;
4164
4165         if (kthread_should_stop())
4166                 return 1;
4167         switch (vhost->action) {
4168         case IBMVFC_HOST_ACTION_NONE:
4169         case IBMVFC_HOST_ACTION_INIT_WAIT:
4170         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4171                 return 0;
4172         case IBMVFC_HOST_ACTION_TGT_INIT:
4173         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4174                 if (vhost->discovery_threads == disc_threads)
4175                         return 0;
4176                 list_for_each_entry(tgt, &vhost->targets, queue)
4177                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4178                                 return 1;
4179                 list_for_each_entry(tgt, &vhost->targets, queue)
4180                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4181                                 return 0;
4182                 return 1;
4183         case IBMVFC_HOST_ACTION_LOGO:
4184         case IBMVFC_HOST_ACTION_INIT:
4185         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4186         case IBMVFC_HOST_ACTION_TGT_DEL:
4187         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4188         case IBMVFC_HOST_ACTION_QUERY:
4189         case IBMVFC_HOST_ACTION_RESET:
4190         case IBMVFC_HOST_ACTION_REENABLE:
4191         default:
4192                 break;
4193         };
4194
4195         return 1;
4196 }
4197
4198 /**
4199  * ibmvfc_work_to_do - Is there task level work to do?
4200  * @vhost:              ibmvfc host struct
4201  *
4202  * Returns:
4203  *      1 if work to do / 0 if not
4204  **/
4205 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4206 {
4207         unsigned long flags;
4208         int rc;
4209
4210         spin_lock_irqsave(vhost->host->host_lock, flags);
4211         rc = __ibmvfc_work_to_do(vhost);
4212         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4213         return rc;
4214 }
4215
4216 /**
4217  * ibmvfc_log_ae - Log async events if necessary
4218  * @vhost:              ibmvfc host struct
4219  * @events:             events to log
4220  *
4221  **/
4222 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4223 {
4224         if (events & IBMVFC_AE_RSCN)
4225                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4226         if ((events & IBMVFC_AE_LINKDOWN) &&
4227             vhost->state >= IBMVFC_HALTED)
4228                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4229         if ((events & IBMVFC_AE_LINKUP) &&
4230             vhost->state == IBMVFC_INITIALIZING)
4231                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4232 }
4233
4234 /**
4235  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4236  * @tgt:                ibmvfc target struct
4237  *
4238  **/
4239 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4240 {
4241         struct ibmvfc_host *vhost = tgt->vhost;
4242         struct fc_rport *rport;
4243         unsigned long flags;
4244
4245         tgt_dbg(tgt, "Adding rport\n");
4246         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4247         spin_lock_irqsave(vhost->host->host_lock, flags);
4248
4249         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4250                 tgt_dbg(tgt, "Deleting rport\n");
4251                 list_del(&tgt->queue);
4252                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4253                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4254                 fc_remote_port_delete(rport);
4255                 del_timer_sync(&tgt->timer);
4256                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4257                 return;
4258         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4259                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4260                 return;
4261         }
4262
4263         if (rport) {
4264                 tgt_dbg(tgt, "rport add succeeded\n");
4265                 tgt->rport = rport;
4266                 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
4267                 rport->supported_classes = 0;
4268                 tgt->target_id = rport->scsi_target_id;
4269                 if (tgt->service_parms.class1_parms[0] & 0x80000000)
4270                         rport->supported_classes |= FC_COS_CLASS1;
4271                 if (tgt->service_parms.class2_parms[0] & 0x80000000)
4272                         rport->supported_classes |= FC_COS_CLASS2;
4273                 if (tgt->service_parms.class3_parms[0] & 0x80000000)
4274                         rport->supported_classes |= FC_COS_CLASS3;
4275                 if (rport->rqst_q)
4276                         blk_queue_max_segments(rport->rqst_q, 1);
4277         } else
4278                 tgt_dbg(tgt, "rport add failed\n");
4279         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4280 }
4281
4282 /**
4283  * ibmvfc_do_work - Do task level work
4284  * @vhost:              ibmvfc host struct
4285  *
4286  **/
4287 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4288 {
4289         struct ibmvfc_target *tgt;
4290         unsigned long flags;
4291         struct fc_rport *rport;
4292         int rc;
4293
4294         ibmvfc_log_ae(vhost, vhost->events_to_log);
4295         spin_lock_irqsave(vhost->host->host_lock, flags);
4296         vhost->events_to_log = 0;
4297         switch (vhost->action) {
4298         case IBMVFC_HOST_ACTION_NONE:
4299         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4300         case IBMVFC_HOST_ACTION_INIT_WAIT:
4301                 break;
4302         case IBMVFC_HOST_ACTION_RESET:
4303                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4304                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4305                 rc = ibmvfc_reset_crq(vhost);
4306                 spin_lock_irqsave(vhost->host->host_lock, flags);
4307                 if (rc == H_CLOSED)
4308                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4309                 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4310                     (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4311                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4312                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4313                 }
4314                 break;
4315         case IBMVFC_HOST_ACTION_REENABLE:
4316                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4317                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4318                 rc = ibmvfc_reenable_crq_queue(vhost);
4319                 spin_lock_irqsave(vhost->host->host_lock, flags);
4320                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4321                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4322                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4323                 }
4324                 break;
4325         case IBMVFC_HOST_ACTION_LOGO:
4326                 vhost->job_step(vhost);
4327                 break;
4328         case IBMVFC_HOST_ACTION_INIT:
4329                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4330                 if (vhost->delay_init) {
4331                         vhost->delay_init = 0;
4332                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4333                         ssleep(15);
4334                         return;
4335                 } else
4336                         vhost->job_step(vhost);
4337                 break;
4338         case IBMVFC_HOST_ACTION_QUERY:
4339                 list_for_each_entry(tgt, &vhost->targets, queue)
4340                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4341                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4342                 break;
4343         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4344                 list_for_each_entry(tgt, &vhost->targets, queue) {
4345                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4346                                 tgt->job_step(tgt);
4347                                 break;
4348                         }
4349                 }
4350
4351                 if (!ibmvfc_dev_init_to_do(vhost))
4352                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4353                 break;
4354         case IBMVFC_HOST_ACTION_TGT_DEL:
4355         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4356                 list_for_each_entry(tgt, &vhost->targets, queue) {
4357                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4358                                 tgt_dbg(tgt, "Deleting rport\n");
4359                                 rport = tgt->rport;
4360                                 tgt->rport = NULL;
4361                                 list_del(&tgt->queue);
4362                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4363                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4364                                 if (rport)
4365                                         fc_remote_port_delete(rport);
4366                                 del_timer_sync(&tgt->timer);
4367                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4368                                 return;
4369                         }
4370                 }
4371
4372                 if (vhost->state == IBMVFC_INITIALIZING) {
4373                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4374                                 if (vhost->reinit) {
4375                                         vhost->reinit = 0;
4376                                         scsi_block_requests(vhost->host);
4377                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4378                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4379                                 } else {
4380                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4381                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4382                                         wake_up(&vhost->init_wait_q);
4383                                         schedule_work(&vhost->rport_add_work_q);
4384                                         vhost->init_retries = 0;
4385                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4386                                         scsi_unblock_requests(vhost->host);
4387                                 }
4388
4389                                 return;
4390                         } else {
4391                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4392                                 vhost->job_step = ibmvfc_discover_targets;
4393                         }
4394                 } else {
4395                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4396                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4397                         scsi_unblock_requests(vhost->host);
4398                         wake_up(&vhost->init_wait_q);
4399                         return;
4400                 }
4401                 break;
4402         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4403                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4404                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4405                 ibmvfc_alloc_targets(vhost);
4406                 spin_lock_irqsave(vhost->host->host_lock, flags);
4407                 break;
4408         case IBMVFC_HOST_ACTION_TGT_INIT:
4409                 list_for_each_entry(tgt, &vhost->targets, queue) {
4410                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4411                                 tgt->job_step(tgt);
4412                                 break;
4413                         }
4414                 }
4415
4416                 if (!ibmvfc_dev_init_to_do(vhost))
4417                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4418                 break;
4419         default:
4420                 break;
4421         };
4422
4423         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4424 }
4425
4426 /**
4427  * ibmvfc_work - Do task level work
4428  * @data:               ibmvfc host struct
4429  *
4430  * Returns:
4431  *      zero
4432  **/
4433 static int ibmvfc_work(void *data)
4434 {
4435         struct ibmvfc_host *vhost = data;
4436         int rc;
4437
4438         set_user_nice(current, -20);
4439
4440         while (1) {
4441                 rc = wait_event_interruptible(vhost->work_wait_q,
4442                                               ibmvfc_work_to_do(vhost));
4443
4444                 BUG_ON(rc);
4445
4446                 if (kthread_should_stop())
4447                         break;
4448
4449                 ibmvfc_do_work(vhost);
4450         }
4451
4452         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4453         return 0;
4454 }
4455
4456 /**
4457  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4458  * @vhost:      ibmvfc host struct
4459  *
4460  * Allocates a page for messages, maps it for dma, and registers
4461  * the crq with the hypervisor.
4462  *
4463  * Return value:
4464  *      zero on success / other on failure
4465  **/
4466 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4467 {
4468         int rc, retrc = -ENOMEM;
4469         struct device *dev = vhost->dev;
4470         struct vio_dev *vdev = to_vio_dev(dev);
4471         struct ibmvfc_crq_queue *crq = &vhost->crq;
4472
4473         ENTER;
4474         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4475
4476         if (!crq->msgs)
4477                 return -ENOMEM;
4478
4479         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4480         crq->msg_token = dma_map_single(dev, crq->msgs,
4481                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4482
4483         if (dma_mapping_error(dev, crq->msg_token))
4484                 goto map_failed;
4485
4486         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4487                                         crq->msg_token, PAGE_SIZE);
4488
4489         if (rc == H_RESOURCE)
4490                 /* maybe kexecing and resource is busy. try a reset */
4491                 retrc = rc = ibmvfc_reset_crq(vhost);
4492
4493         if (rc == H_CLOSED)
4494                 dev_warn(dev, "Partner adapter not ready\n");
4495         else if (rc) {
4496                 dev_warn(dev, "Error %d opening adapter\n", rc);
4497                 goto reg_crq_failed;
4498         }
4499
4500         retrc = 0;
4501
4502         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4503
4504         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4505                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4506                 goto req_irq_failed;
4507         }
4508
4509         if ((rc = vio_enable_interrupts(vdev))) {
4510                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4511                 goto req_irq_failed;
4512         }
4513
4514         crq->cur = 0;
4515         LEAVE;
4516         return retrc;
4517
4518 req_irq_failed:
4519         tasklet_kill(&vhost->tasklet);
4520         do {
4521                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4522         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4523 reg_crq_failed:
4524         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4525 map_failed:
4526         free_page((unsigned long)crq->msgs);
4527         return retrc;
4528 }
4529
4530 /**
4531  * ibmvfc_free_mem - Free memory for vhost
4532  * @vhost:      ibmvfc host struct
4533  *
4534  * Return value:
4535  *      none
4536  **/
4537 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4538 {
4539         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4540
4541         ENTER;
4542         mempool_destroy(vhost->tgt_pool);
4543         kfree(vhost->trace);
4544         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4545                           vhost->disc_buf_dma);
4546         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4547                           vhost->login_buf, vhost->login_buf_dma);
4548         dma_pool_destroy(vhost->sg_pool);
4549         dma_unmap_single(vhost->dev, async_q->msg_token,
4550                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4551         free_page((unsigned long)async_q->msgs);
4552         LEAVE;
4553 }
4554
4555 /**
4556  * ibmvfc_alloc_mem - Allocate memory for vhost
4557  * @vhost:      ibmvfc host struct
4558  *
4559  * Return value:
4560  *      0 on success / non-zero on failure
4561  **/
4562 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4563 {
4564         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4565         struct device *dev = vhost->dev;
4566
4567         ENTER;
4568         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4569         if (!async_q->msgs) {
4570                 dev_err(dev, "Couldn't allocate async queue.\n");
4571                 goto nomem;
4572         }
4573
4574         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4575         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4576                                             async_q->size * sizeof(*async_q->msgs),
4577                                             DMA_BIDIRECTIONAL);
4578
4579         if (dma_mapping_error(dev, async_q->msg_token)) {
4580                 dev_err(dev, "Failed to map async queue\n");
4581                 goto free_async_crq;
4582         }
4583
4584         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4585                                          SG_ALL * sizeof(struct srp_direct_buf),
4586                                          sizeof(struct srp_direct_buf), 0);
4587
4588         if (!vhost->sg_pool) {
4589                 dev_err(dev, "Failed to allocate sg pool\n");
4590                 goto unmap_async_crq;
4591         }
4592
4593         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4594                                               &vhost->login_buf_dma, GFP_KERNEL);
4595
4596         if (!vhost->login_buf) {
4597                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4598                 goto free_sg_pool;
4599         }
4600
4601         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4602         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4603                                              &vhost->disc_buf_dma, GFP_KERNEL);
4604
4605         if (!vhost->disc_buf) {
4606                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4607                 goto free_login_buffer;
4608         }
4609
4610         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4611                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4612
4613         if (!vhost->trace)
4614                 goto free_disc_buffer;
4615
4616         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4617                                                       sizeof(struct ibmvfc_target));
4618
4619         if (!vhost->tgt_pool) {
4620                 dev_err(dev, "Couldn't allocate target memory pool\n");
4621                 goto free_trace;
4622         }
4623
4624         LEAVE;
4625         return 0;
4626
4627 free_trace:
4628         kfree(vhost->trace);
4629 free_disc_buffer:
4630         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4631                           vhost->disc_buf_dma);
4632 free_login_buffer:
4633         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4634                           vhost->login_buf, vhost->login_buf_dma);
4635 free_sg_pool:
4636         dma_pool_destroy(vhost->sg_pool);
4637 unmap_async_crq:
4638         dma_unmap_single(dev, async_q->msg_token,
4639                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4640 free_async_crq:
4641         free_page((unsigned long)async_q->msgs);
4642 nomem:
4643         LEAVE;
4644         return -ENOMEM;
4645 }
4646
4647 /**
4648  * ibmvfc_rport_add_thread - Worker thread for rport adds
4649  * @work:       work struct
4650  *
4651  **/
4652 static void ibmvfc_rport_add_thread(struct work_struct *work)
4653 {
4654         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4655                                                  rport_add_work_q);
4656         struct ibmvfc_target *tgt;
4657         struct fc_rport *rport;
4658         unsigned long flags;
4659         int did_work;
4660
4661         ENTER;
4662         spin_lock_irqsave(vhost->host->host_lock, flags);
4663         do {
4664                 did_work = 0;
4665                 if (vhost->state != IBMVFC_ACTIVE)
4666                         break;
4667
4668                 list_for_each_entry(tgt, &vhost->targets, queue) {
4669                         if (tgt->add_rport) {
4670                                 did_work = 1;
4671                                 tgt->add_rport = 0;
4672                                 kref_get(&tgt->kref);
4673                                 rport = tgt->rport;
4674                                 if (!rport) {
4675                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4676                                         ibmvfc_tgt_add_rport(tgt);
4677                                 } else if (get_device(&rport->dev)) {
4678                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4679                                         tgt_dbg(tgt, "Setting rport roles\n");
4680                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4681                                         put_device(&rport->dev);
4682                                 }
4683
4684                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4685                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4686                                 break;
4687                         }
4688                 }
4689         } while(did_work);
4690
4691         if (vhost->state == IBMVFC_ACTIVE)
4692                 vhost->scan_complete = 1;
4693         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4694         LEAVE;
4695 }
4696
4697 /**
4698  * ibmvfc_probe - Adapter hot plug add entry point
4699  * @vdev:       vio device struct
4700  * @id: vio device id struct
4701  *
4702  * Return value:
4703  *      0 on success / non-zero on failure
4704  **/
4705 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4706 {
4707         struct ibmvfc_host *vhost;
4708         struct Scsi_Host *shost;
4709         struct device *dev = &vdev->dev;
4710         int rc = -ENOMEM;
4711
4712         ENTER;
4713         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4714         if (!shost) {
4715                 dev_err(dev, "Couldn't allocate host data\n");
4716                 goto out;
4717         }
4718
4719         shost->transportt = ibmvfc_transport_template;
4720         shost->can_queue = max_requests;
4721         shost->max_lun = max_lun;
4722         shost->max_id = max_targets;
4723         shost->max_sectors = IBMVFC_MAX_SECTORS;
4724         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4725         shost->unique_id = shost->host_no;
4726
4727         vhost = shost_priv(shost);
4728         INIT_LIST_HEAD(&vhost->sent);
4729         INIT_LIST_HEAD(&vhost->free);
4730         INIT_LIST_HEAD(&vhost->targets);
4731         sprintf(vhost->name, IBMVFC_NAME);
4732         vhost->host = shost;
4733         vhost->dev = dev;
4734         vhost->partition_number = -1;
4735         vhost->log_level = log_level;
4736         vhost->task_set = 1;
4737         strcpy(vhost->partition_name, "UNKNOWN");
4738         init_waitqueue_head(&vhost->work_wait_q);
4739         init_waitqueue_head(&vhost->init_wait_q);
4740         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4741         mutex_init(&vhost->passthru_mutex);
4742
4743         if ((rc = ibmvfc_alloc_mem(vhost)))
4744                 goto free_scsi_host;
4745
4746         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4747                                          shost->host_no);
4748
4749         if (IS_ERR(vhost->work_thread)) {
4750                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4751                         PTR_ERR(vhost->work_thread));
4752                 goto free_host_mem;
4753         }
4754
4755         if ((rc = ibmvfc_init_crq(vhost))) {
4756                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4757                 goto kill_kthread;
4758         }
4759
4760         if ((rc = ibmvfc_init_event_pool(vhost))) {
4761                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4762                 goto release_crq;
4763         }
4764
4765         if ((rc = scsi_add_host(shost, dev)))
4766                 goto release_event_pool;
4767
4768         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4769
4770         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4771                                            &ibmvfc_trace_attr))) {
4772                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4773                 goto remove_shost;
4774         }
4775
4776         if (shost_to_fc_host(shost)->rqst_q)
4777                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4778         dev_set_drvdata(dev, vhost);
4779         spin_lock(&ibmvfc_driver_lock);
4780         list_add_tail(&vhost->queue, &ibmvfc_head);
4781         spin_unlock(&ibmvfc_driver_lock);
4782
4783         ibmvfc_send_crq_init(vhost);
4784         scsi_scan_host(shost);
4785         return 0;
4786
4787 remove_shost:
4788         scsi_remove_host(shost);
4789 release_event_pool:
4790         ibmvfc_free_event_pool(vhost);
4791 release_crq:
4792         ibmvfc_release_crq_queue(vhost);
4793 kill_kthread:
4794         kthread_stop(vhost->work_thread);
4795 free_host_mem:
4796         ibmvfc_free_mem(vhost);
4797 free_scsi_host:
4798         scsi_host_put(shost);
4799 out:
4800         LEAVE;
4801         return rc;
4802 }
4803
4804 /**
4805  * ibmvfc_remove - Adapter hot plug remove entry point
4806  * @vdev:       vio device struct
4807  *
4808  * Return value:
4809  *      0
4810  **/
4811 static int ibmvfc_remove(struct vio_dev *vdev)
4812 {
4813         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4814         unsigned long flags;
4815
4816         ENTER;
4817         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4818
4819         spin_lock_irqsave(vhost->host->host_lock, flags);
4820         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4821         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4822
4823         ibmvfc_wait_while_resetting(vhost);
4824         ibmvfc_release_crq_queue(vhost);
4825         kthread_stop(vhost->work_thread);
4826         fc_remove_host(vhost->host);
4827         scsi_remove_host(vhost->host);
4828
4829         spin_lock_irqsave(vhost->host->host_lock, flags);
4830         ibmvfc_purge_requests(vhost, DID_ERROR);
4831         ibmvfc_free_event_pool(vhost);
4832         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4833
4834         ibmvfc_free_mem(vhost);
4835         spin_lock(&ibmvfc_driver_lock);
4836         list_del(&vhost->queue);
4837         spin_unlock(&ibmvfc_driver_lock);
4838         scsi_host_put(vhost->host);
4839         LEAVE;
4840         return 0;
4841 }
4842
4843 /**
4844  * ibmvfc_resume - Resume from suspend
4845  * @dev:        device struct
4846  *
4847  * We may have lost an interrupt across suspend/resume, so kick the
4848  * interrupt handler
4849  *
4850  */
4851 static int ibmvfc_resume(struct device *dev)
4852 {
4853         unsigned long flags;
4854         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4855         struct vio_dev *vdev = to_vio_dev(dev);
4856
4857         spin_lock_irqsave(vhost->host->host_lock, flags);
4858         vio_disable_interrupts(vdev);
4859         tasklet_schedule(&vhost->tasklet);
4860         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4861         return 0;
4862 }
4863
4864 /**
4865  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4866  * @vdev:       vio device struct
4867  *
4868  * Return value:
4869  *      Number of bytes the driver will need to DMA map at the same time in
4870  *      order to perform well.
4871  */
4872 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4873 {
4874         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4875         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4876 }
4877
4878 static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
4879         {"fcp", "IBM,vfc-client"},
4880         { "", "" }
4881 };
4882 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4883
4884 static struct dev_pm_ops ibmvfc_pm_ops = {
4885         .resume = ibmvfc_resume
4886 };
4887
4888 static struct vio_driver ibmvfc_driver = {
4889         .id_table = ibmvfc_device_table,
4890         .probe = ibmvfc_probe,
4891         .remove = ibmvfc_remove,
4892         .get_desired_dma = ibmvfc_get_desired_dma,
4893         .driver = {
4894                 .name = IBMVFC_NAME,
4895                 .owner = THIS_MODULE,
4896                 .pm = &ibmvfc_pm_ops,
4897         }
4898 };
4899
4900 static struct fc_function_template ibmvfc_transport_functions = {
4901         .show_host_fabric_name = 1,
4902         .show_host_node_name = 1,
4903         .show_host_port_name = 1,
4904         .show_host_supported_classes = 1,
4905         .show_host_port_type = 1,
4906         .show_host_port_id = 1,
4907         .show_host_maxframe_size = 1,
4908
4909         .get_host_port_state = ibmvfc_get_host_port_state,
4910         .show_host_port_state = 1,
4911
4912         .get_host_speed = ibmvfc_get_host_speed,
4913         .show_host_speed = 1,
4914
4915         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4916         .terminate_rport_io = ibmvfc_terminate_rport_io,
4917
4918         .show_rport_maxframe_size = 1,
4919         .show_rport_supported_classes = 1,
4920
4921         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4922         .show_rport_dev_loss_tmo = 1,
4923
4924         .get_starget_node_name = ibmvfc_get_starget_node_name,
4925         .show_starget_node_name = 1,
4926
4927         .get_starget_port_name = ibmvfc_get_starget_port_name,
4928         .show_starget_port_name = 1,
4929
4930         .get_starget_port_id = ibmvfc_get_starget_port_id,
4931         .show_starget_port_id = 1,
4932
4933         .bsg_request = ibmvfc_bsg_request,
4934         .bsg_timeout = ibmvfc_bsg_timeout,
4935 };
4936
4937 /**
4938  * ibmvfc_module_init - Initialize the ibmvfc module
4939  *
4940  * Return value:
4941  *      0 on success / other on failure
4942  **/
4943 static int __init ibmvfc_module_init(void)
4944 {
4945         int rc;
4946
4947         if (!firmware_has_feature(FW_FEATURE_VIO))
4948                 return -ENODEV;
4949
4950         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4951                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4952
4953         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4954         if (!ibmvfc_transport_template)
4955                 return -ENOMEM;
4956
4957         rc = vio_register_driver(&ibmvfc_driver);
4958         if (rc)
4959                 fc_release_transport(ibmvfc_transport_template);
4960         return rc;
4961 }
4962
4963 /**
4964  * ibmvfc_module_exit - Teardown the ibmvfc module
4965  *
4966  * Return value:
4967  *      nothing
4968  **/
4969 static void __exit ibmvfc_module_exit(void)
4970 {
4971         vio_unregister_driver(&ibmvfc_driver);
4972         fc_release_transport(ibmvfc_transport_template);
4973 }
4974
4975 module_init(ibmvfc_module_init);
4976 module_exit(ibmvfc_module_exit);