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