drivers/scsi/ibmvscsi/ibmvfc.c

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