drivers/scsi/ibmvscsi/ibmvfc.c

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