drivers/scsi/ibmvscsi/ibmvfc.c

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