drivers/scsi/ibmvscsi/ibmvfc.c

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