linux/drivers/scsi/ibmvscsi/ibmvfc.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
   4 *
   5 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
   6 *
   7 * Copyright (C) IBM Corporation, 2008
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/moduleparam.h>
  12#include <linux/dma-mapping.h>
  13#include <linux/dmapool.h>
  14#include <linux/delay.h>
  15#include <linux/interrupt.h>
  16#include <linux/irqdomain.h>
  17#include <linux/kthread.h>
  18#include <linux/slab.h>
  19#include <linux/of.h>
  20#include <linux/pm.h>
  21#include <linux/stringify.h>
  22#include <linux/bsg-lib.h>
  23#include <asm/firmware.h>
  24#include <asm/irq.h>
  25#include <asm/rtas.h>
  26#include <asm/vio.h>
  27#include <scsi/scsi.h>
  28#include <scsi/scsi_cmnd.h>
  29#include <scsi/scsi_host.h>
  30#include <scsi/scsi_device.h>
  31#include <scsi/scsi_tcq.h>
  32#include <scsi/scsi_transport_fc.h>
  33#include <scsi/scsi_bsg_fc.h>
  34#include "ibmvfc.h"
  35
  36static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  37static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  38static u64 max_lun = IBMVFC_MAX_LUN;
  39static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  40static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  41static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  42static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  43static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  44static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
  45static unsigned int mq_enabled = IBMVFC_MQ;
  46static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES;
  47static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS;
  48static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ;
  49static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M;
  50
  51static LIST_HEAD(ibmvfc_head);
  52static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  53static struct scsi_transport_template *ibmvfc_transport_template;
  54
  55MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  56MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  57MODULE_LICENSE("GPL");
  58MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  59
  60module_param_named(mq, mq_enabled, uint, S_IRUGO);
  61MODULE_PARM_DESC(mq, "Enable multiqueue support. "
  62                 "[Default=" __stringify(IBMVFC_MQ) "]");
  63module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO);
  64MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. "
  65                 "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]");
  66module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO);
  67MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. "
  68                 "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]");
  69module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO);
  70MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. "
  71                 "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]");
  72module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO);
  73MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. "
  74                 "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]");
  75
  76module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  77MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  78                 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  79module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  80MODULE_PARM_DESC(default_timeout,
  81                 "Default timeout in seconds for initialization and EH commands. "
  82                 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  83module_param_named(max_requests, max_requests, uint, S_IRUGO);
  84MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  85                 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  86module_param_named(max_lun, max_lun, ullong, S_IRUGO);
  87MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  88                 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  89module_param_named(max_targets, max_targets, uint, S_IRUGO);
  90MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  91                 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  92module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
  93MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
  94                 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
  95module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
  96MODULE_PARM_DESC(debug, "Enable driver debug information. "
  97                 "[Default=" __stringify(IBMVFC_DEBUG) "]");
  98module_param_named(log_level, log_level, uint, 0);
  99MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
 100                 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
 101module_param_named(cls3_error, cls3_error, uint, 0);
 102MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
 103                 "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
 104
 105static const struct {
 106        u16 status;
 107        u16 error;
 108        u8 result;
 109        u8 retry;
 110        int log;
 111        char *name;
 112} cmd_status [] = {
 113        { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
 114        { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
 115        { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
 116        { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
 117        { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
 118        { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
 119        { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
 120        { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
 121        { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
 122        { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
 123        { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 124        { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 125        { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 126        { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 127
 128        { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 129        { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 130        { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 131        { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 132        { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 133        { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 134        { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 135        { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 136        { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 137        { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 138
 139        { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 140        { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 141        { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 142        { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 143        { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 144        { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 145        { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 146        { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 147        { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 148        { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 149        { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 150
 151        { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 152        { IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
 153};
 154
 155static void ibmvfc_npiv_login(struct ibmvfc_host *);
 156static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 157static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 158static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 159static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 160static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *);
 161static void ibmvfc_tgt_move_login(struct ibmvfc_target *);
 162
 163static void ibmvfc_release_sub_crqs(struct ibmvfc_host *);
 164static void ibmvfc_init_sub_crqs(struct ibmvfc_host *);
 165
 166static const char *unknown_error = "unknown error";
 167
 168static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba,
 169                          unsigned long length, unsigned long *cookie,
 170                          unsigned long *irq)
 171{
 172        unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 173        long rc;
 174
 175        rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length);
 176        *cookie = retbuf[0];
 177        *irq = retbuf[1];
 178
 179        return rc;
 180}
 181
 182static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags)
 183{
 184        u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities);
 185
 186        return (host_caps & cap_flags) ? 1 : 0;
 187}
 188
 189static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost,
 190                                                   struct ibmvfc_cmd *vfc_cmd)
 191{
 192        if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
 193                return &vfc_cmd->v2.iu;
 194        else
 195                return &vfc_cmd->v1.iu;
 196}
 197
 198static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost,
 199                                                 struct ibmvfc_cmd *vfc_cmd)
 200{
 201        if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
 202                return &vfc_cmd->v2.rsp;
 203        else
 204                return &vfc_cmd->v1.rsp;
 205}
 206
 207#ifdef CONFIG_SCSI_IBMVFC_TRACE
 208/**
 209 * ibmvfc_trc_start - Log a start trace entry
 210 * @evt:                ibmvfc event struct
 211 *
 212 **/
 213static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 214{
 215        struct ibmvfc_host *vhost = evt->vhost;
 216        struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 217        struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 218        struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
 219        struct ibmvfc_trace_entry *entry;
 220        int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
 221
 222        entry = &vhost->trace[index];
 223        entry->evt = evt;
 224        entry->time = jiffies;
 225        entry->fmt = evt->crq.format;
 226        entry->type = IBMVFC_TRC_START;
 227
 228        switch (entry->fmt) {
 229        case IBMVFC_CMD_FORMAT:
 230                entry->op_code = iu->cdb[0];
 231                entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 232                entry->lun = scsilun_to_int(&iu->lun);
 233                entry->tmf_flags = iu->tmf_flags;
 234                entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len);
 235                break;
 236        case IBMVFC_MAD_FORMAT:
 237                entry->op_code = be32_to_cpu(mad->opcode);
 238                break;
 239        default:
 240                break;
 241        }
 242}
 243
 244/**
 245 * ibmvfc_trc_end - Log an end trace entry
 246 * @evt:                ibmvfc event struct
 247 *
 248 **/
 249static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 250{
 251        struct ibmvfc_host *vhost = evt->vhost;
 252        struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 253        struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 254        struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
 255        struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
 256        struct ibmvfc_trace_entry *entry;
 257        int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
 258
 259        entry = &vhost->trace[index];
 260        entry->evt = evt;
 261        entry->time = jiffies;
 262        entry->fmt = evt->crq.format;
 263        entry->type = IBMVFC_TRC_END;
 264
 265        switch (entry->fmt) {
 266        case IBMVFC_CMD_FORMAT:
 267                entry->op_code = iu->cdb[0];
 268                entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 269                entry->lun = scsilun_to_int(&iu->lun);
 270                entry->tmf_flags = iu->tmf_flags;
 271                entry->u.end.status = be16_to_cpu(vfc_cmd->status);
 272                entry->u.end.error = be16_to_cpu(vfc_cmd->error);
 273                entry->u.end.fcp_rsp_flags = rsp->flags;
 274                entry->u.end.rsp_code = rsp->data.info.rsp_code;
 275                entry->u.end.scsi_status = rsp->scsi_status;
 276                break;
 277        case IBMVFC_MAD_FORMAT:
 278                entry->op_code = be32_to_cpu(mad->opcode);
 279                entry->u.end.status = be16_to_cpu(mad->status);
 280                break;
 281        default:
 282                break;
 283
 284        }
 285}
 286
 287#else
 288#define ibmvfc_trc_start(evt) do { } while (0)
 289#define ibmvfc_trc_end(evt) do { } while (0)
 290#endif
 291
 292/**
 293 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 294 * @status:             status / error class
 295 * @error:              error
 296 *
 297 * Return value:
 298 *      index into cmd_status / -EINVAL on failure
 299 **/
 300static int ibmvfc_get_err_index(u16 status, u16 error)
 301{
 302        int i;
 303
 304        for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 305                if ((cmd_status[i].status & status) == cmd_status[i].status &&
 306                    cmd_status[i].error == error)
 307                        return i;
 308
 309        return -EINVAL;
 310}
 311
 312/**
 313 * ibmvfc_get_cmd_error - Find the error description for the fcp response
 314 * @status:             status / error class
 315 * @error:              error
 316 *
 317 * Return value:
 318 *      error description string
 319 **/
 320static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 321{
 322        int rc = ibmvfc_get_err_index(status, error);
 323        if (rc >= 0)
 324                return cmd_status[rc].name;
 325        return unknown_error;
 326}
 327
 328/**
 329 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 330 * @vhost:      ibmvfc host struct
 331 * @vfc_cmd:    ibmvfc command struct
 332 *
 333 * Return value:
 334 *      SCSI result value to return for completed command
 335 **/
 336static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd)
 337{
 338        int err;
 339        struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
 340        int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
 341
 342        if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 343            ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 344             rsp->data.info.rsp_code))
 345                return DID_ERROR << 16;
 346
 347        err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
 348        if (err >= 0)
 349                return rsp->scsi_status | (cmd_status[err].result << 16);
 350        return rsp->scsi_status | (DID_ERROR << 16);
 351}
 352
 353/**
 354 * ibmvfc_retry_cmd - Determine if error status is retryable
 355 * @status:             status / error class
 356 * @error:              error
 357 *
 358 * Return value:
 359 *      1 if error should be retried / 0 if it should not
 360 **/
 361static int ibmvfc_retry_cmd(u16 status, u16 error)
 362{
 363        int rc = ibmvfc_get_err_index(status, error);
 364
 365        if (rc >= 0)
 366                return cmd_status[rc].retry;
 367        return 1;
 368}
 369
 370static const char *unknown_fc_explain = "unknown fc explain";
 371
 372static const struct {
 373        u16 fc_explain;
 374        char *name;
 375} ls_explain [] = {
 376        { 0x00, "no additional explanation" },
 377        { 0x01, "service parameter error - options" },
 378        { 0x03, "service parameter error - initiator control" },
 379        { 0x05, "service parameter error - recipient control" },
 380        { 0x07, "service parameter error - received data field size" },
 381        { 0x09, "service parameter error - concurrent seq" },
 382        { 0x0B, "service parameter error - credit" },
 383        { 0x0D, "invalid N_Port/F_Port_Name" },
 384        { 0x0E, "invalid node/Fabric Name" },
 385        { 0x0F, "invalid common service parameters" },
 386        { 0x11, "invalid association header" },
 387        { 0x13, "association header required" },
 388        { 0x15, "invalid originator S_ID" },
 389        { 0x17, "invalid OX_ID-RX-ID combination" },
 390        { 0x19, "command (request) already in progress" },
 391        { 0x1E, "N_Port Login requested" },
 392        { 0x1F, "Invalid N_Port_ID" },
 393};
 394
 395static const struct {
 396        u16 fc_explain;
 397        char *name;
 398} gs_explain [] = {
 399        { 0x00, "no additional explanation" },
 400        { 0x01, "port identifier not registered" },
 401        { 0x02, "port name not registered" },
 402        { 0x03, "node name not registered" },
 403        { 0x04, "class of service not registered" },
 404        { 0x06, "initial process associator not registered" },
 405        { 0x07, "FC-4 TYPEs not registered" },
 406        { 0x08, "symbolic port name not registered" },
 407        { 0x09, "symbolic node name not registered" },
 408        { 0x0A, "port type not registered" },
 409        { 0xF0, "authorization exception" },
 410        { 0xF1, "authentication exception" },
 411        { 0xF2, "data base full" },
 412        { 0xF3, "data base empty" },
 413        { 0xF4, "processing request" },
 414        { 0xF5, "unable to verify connection" },
 415        { 0xF6, "devices not in a common zone" },
 416};
 417
 418/**
 419 * ibmvfc_get_ls_explain - Return the FC Explain description text
 420 * @status:     FC Explain status
 421 *
 422 * Returns:
 423 *      error string
 424 **/
 425static const char *ibmvfc_get_ls_explain(u16 status)
 426{
 427        int i;
 428
 429        for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 430                if (ls_explain[i].fc_explain == status)
 431                        return ls_explain[i].name;
 432
 433        return unknown_fc_explain;
 434}
 435
 436/**
 437 * ibmvfc_get_gs_explain - Return the FC Explain description text
 438 * @status:     FC Explain status
 439 *
 440 * Returns:
 441 *      error string
 442 **/
 443static const char *ibmvfc_get_gs_explain(u16 status)
 444{
 445        int i;
 446
 447        for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 448                if (gs_explain[i].fc_explain == status)
 449                        return gs_explain[i].name;
 450
 451        return unknown_fc_explain;
 452}
 453
 454static const struct {
 455        enum ibmvfc_fc_type fc_type;
 456        char *name;
 457} fc_type [] = {
 458        { IBMVFC_FABRIC_REJECT, "fabric reject" },
 459        { IBMVFC_PORT_REJECT, "port reject" },
 460        { IBMVFC_LS_REJECT, "ELS reject" },
 461        { IBMVFC_FABRIC_BUSY, "fabric busy" },
 462        { IBMVFC_PORT_BUSY, "port busy" },
 463        { IBMVFC_BASIC_REJECT, "basic reject" },
 464};
 465
 466static const char *unknown_fc_type = "unknown fc type";
 467
 468/**
 469 * ibmvfc_get_fc_type - Return the FC Type description text
 470 * @status:     FC Type error status
 471 *
 472 * Returns:
 473 *      error string
 474 **/
 475static const char *ibmvfc_get_fc_type(u16 status)
 476{
 477        int i;
 478
 479        for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 480                if (fc_type[i].fc_type == status)
 481                        return fc_type[i].name;
 482
 483        return unknown_fc_type;
 484}
 485
 486/**
 487 * ibmvfc_set_tgt_action - Set the next init action for the target
 488 * @tgt:                ibmvfc target struct
 489 * @action:             action to perform
 490 *
 491 * Returns:
 492 *      0 if action changed / non-zero if not changed
 493 **/
 494static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 495                                  enum ibmvfc_target_action action)
 496{
 497        int rc = -EINVAL;
 498
 499        switch (tgt->action) {
 500        case IBMVFC_TGT_ACTION_LOGOUT_RPORT:
 501                if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT ||
 502                    action == IBMVFC_TGT_ACTION_DEL_RPORT) {
 503                        tgt->action = action;
 504                        rc = 0;
 505                }
 506                break;
 507        case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT:
 508                if (action == IBMVFC_TGT_ACTION_DEL_RPORT ||
 509                    action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
 510                        tgt->action = action;
 511                        rc = 0;
 512                }
 513                break;
 514        case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT:
 515                if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
 516                        tgt->action = action;
 517                        rc = 0;
 518                }
 519                break;
 520        case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT:
 521                if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
 522                        tgt->action = action;
 523                        rc = 0;
 524                }
 525                break;
 526        case IBMVFC_TGT_ACTION_DEL_RPORT:
 527                if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
 528                        tgt->action = action;
 529                        rc = 0;
 530                }
 531                break;
 532        case IBMVFC_TGT_ACTION_DELETED_RPORT:
 533                break;
 534        default:
 535                tgt->action = action;
 536                rc = 0;
 537                break;
 538        }
 539
 540        if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT)
 541                tgt->add_rport = 0;
 542
 543        return rc;
 544}
 545
 546/**
 547 * ibmvfc_set_host_state - Set the state for the host
 548 * @vhost:              ibmvfc host struct
 549 * @state:              state to set host to
 550 *
 551 * Returns:
 552 *      0 if state changed / non-zero if not changed
 553 **/
 554static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
 555                                  enum ibmvfc_host_state state)
 556{
 557        int rc = 0;
 558
 559        switch (vhost->state) {
 560        case IBMVFC_HOST_OFFLINE:
 561                rc = -EINVAL;
 562                break;
 563        default:
 564                vhost->state = state;
 565                break;
 566        }
 567
 568        return rc;
 569}
 570
 571/**
 572 * ibmvfc_set_host_action - Set the next init action for the host
 573 * @vhost:              ibmvfc host struct
 574 * @action:             action to perform
 575 *
 576 **/
 577static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 578                                   enum ibmvfc_host_action action)
 579{
 580        switch (action) {
 581        case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 582                if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
 583                        vhost->action = action;
 584                break;
 585        case IBMVFC_HOST_ACTION_LOGO_WAIT:
 586                if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
 587                        vhost->action = action;
 588                break;
 589        case IBMVFC_HOST_ACTION_INIT_WAIT:
 590                if (vhost->action == IBMVFC_HOST_ACTION_INIT)
 591                        vhost->action = action;
 592                break;
 593        case IBMVFC_HOST_ACTION_QUERY:
 594                switch (vhost->action) {
 595                case IBMVFC_HOST_ACTION_INIT_WAIT:
 596                case IBMVFC_HOST_ACTION_NONE:
 597                case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 598                        vhost->action = action;
 599                        break;
 600                default:
 601                        break;
 602                }
 603                break;
 604        case IBMVFC_HOST_ACTION_TGT_INIT:
 605                if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 606                        vhost->action = action;
 607                break;
 608        case IBMVFC_HOST_ACTION_REENABLE:
 609        case IBMVFC_HOST_ACTION_RESET:
 610                vhost->action = action;
 611                break;
 612        case IBMVFC_HOST_ACTION_INIT:
 613        case IBMVFC_HOST_ACTION_TGT_DEL:
 614        case IBMVFC_HOST_ACTION_LOGO:
 615        case IBMVFC_HOST_ACTION_QUERY_TGTS:
 616        case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 617        case IBMVFC_HOST_ACTION_NONE:
 618        default:
 619                switch (vhost->action) {
 620                case IBMVFC_HOST_ACTION_RESET:
 621                case IBMVFC_HOST_ACTION_REENABLE:
 622                        break;
 623                default:
 624                        vhost->action = action;
 625                        break;
 626                }
 627                break;
 628        }
 629}
 630
 631/**
 632 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 633 * @vhost:              ibmvfc host struct
 634 *
 635 * Return value:
 636 *      nothing
 637 **/
 638static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 639{
 640        if (vhost->action == IBMVFC_HOST_ACTION_NONE &&
 641            vhost->state == IBMVFC_ACTIVE) {
 642                if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 643                        scsi_block_requests(vhost->host);
 644                        ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 645                }
 646        } else
 647                vhost->reinit = 1;
 648
 649        wake_up(&vhost->work_wait_q);
 650}
 651
 652/**
 653 * ibmvfc_del_tgt - Schedule cleanup and removal of the target
 654 * @tgt:                ibmvfc target struct
 655 **/
 656static void ibmvfc_del_tgt(struct ibmvfc_target *tgt)
 657{
 658        if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) {
 659                tgt->job_step = ibmvfc_tgt_implicit_logout_and_del;
 660                tgt->init_retries = 0;
 661        }
 662        wake_up(&tgt->vhost->work_wait_q);
 663}
 664
 665/**
 666 * ibmvfc_link_down - Handle a link down event from the adapter
 667 * @vhost:      ibmvfc host struct
 668 * @state:      ibmvfc host state to enter
 669 *
 670 **/
 671static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 672                             enum ibmvfc_host_state state)
 673{
 674        struct ibmvfc_target *tgt;
 675
 676        ENTER;
 677        scsi_block_requests(vhost->host);
 678        list_for_each_entry(tgt, &vhost->targets, queue)
 679                ibmvfc_del_tgt(tgt);
 680        ibmvfc_set_host_state(vhost, state);
 681        ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 682        vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 683        wake_up(&vhost->work_wait_q);
 684        LEAVE;
 685}
 686
 687/**
 688 * ibmvfc_init_host - Start host initialization
 689 * @vhost:              ibmvfc host struct
 690 *
 691 * Return value:
 692 *      nothing
 693 **/
 694static void ibmvfc_init_host(struct ibmvfc_host *vhost)
 695{
 696        struct ibmvfc_target *tgt;
 697
 698        if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 699                if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 700                        dev_err(vhost->dev,
 701                                "Host initialization retries exceeded. Taking adapter offline\n");
 702                        ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 703                        return;
 704                }
 705        }
 706
 707        if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 708                memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE);
 709                vhost->async_crq.cur = 0;
 710
 711                list_for_each_entry(tgt, &vhost->targets, queue)
 712                        ibmvfc_del_tgt(tgt);
 713                scsi_block_requests(vhost->host);
 714                ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 715                vhost->job_step = ibmvfc_npiv_login;
 716                wake_up(&vhost->work_wait_q);
 717        }
 718}
 719
 720/**
 721 * ibmvfc_send_crq - Send a CRQ
 722 * @vhost:      ibmvfc host struct
 723 * @word1:      the first 64 bits of the data
 724 * @word2:      the second 64 bits of the data
 725 *
 726 * Return value:
 727 *      0 on success / other on failure
 728 **/
 729static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 730{
 731        struct vio_dev *vdev = to_vio_dev(vhost->dev);
 732        return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 733}
 734
 735static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1,
 736                               u64 word2, u64 word3, u64 word4)
 737{
 738        struct vio_dev *vdev = to_vio_dev(vhost->dev);
 739
 740        return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie,
 741                                  word1, word2, word3, word4);
 742}
 743
 744/**
 745 * ibmvfc_send_crq_init - Send a CRQ init message
 746 * @vhost:      ibmvfc host struct
 747 *
 748 * Return value:
 749 *      0 on success / other on failure
 750 **/
 751static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
 752{
 753        ibmvfc_dbg(vhost, "Sending CRQ init\n");
 754        return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 755}
 756
 757/**
 758 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 759 * @vhost:      ibmvfc host struct
 760 *
 761 * Return value:
 762 *      0 on success / other on failure
 763 **/
 764static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 765{
 766        ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 767        return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 768}
 769
 770/**
 771 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
 772 * @vhost:      ibmvfc host who owns the event pool
 773 * @queue:      ibmvfc queue struct
 774 * @size:       pool size
 775 *
 776 * Returns zero on success.
 777 **/
 778static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost,
 779                                  struct ibmvfc_queue *queue,
 780                                  unsigned int size)
 781{
 782        int i;
 783        struct ibmvfc_event_pool *pool = &queue->evt_pool;
 784
 785        ENTER;
 786        if (!size)
 787                return 0;
 788
 789        pool->size = size;
 790        pool->events = kcalloc(size, sizeof(*pool->events), GFP_KERNEL);
 791        if (!pool->events)
 792                return -ENOMEM;
 793
 794        pool->iu_storage = dma_alloc_coherent(vhost->dev,
 795                                              size * sizeof(*pool->iu_storage),
 796                                              &pool->iu_token, 0);
 797
 798        if (!pool->iu_storage) {
 799                kfree(pool->events);
 800                return -ENOMEM;
 801        }
 802
 803        INIT_LIST_HEAD(&queue->sent);
 804        INIT_LIST_HEAD(&queue->free);
 805        spin_lock_init(&queue->l_lock);
 806
 807        for (i = 0; i < size; ++i) {
 808                struct ibmvfc_event *evt = &pool->events[i];
 809
 810                /*
 811                 * evt->active states
 812                 *  1 = in flight
 813                 *  0 = being completed
 814                 * -1 = free/freed
 815                 */
 816                atomic_set(&evt->active, -1);
 817                atomic_set(&evt->free, 1);
 818                evt->crq.valid = 0x80;
 819                evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
 820                evt->xfer_iu = pool->iu_storage + i;
 821                evt->vhost = vhost;
 822                evt->queue = queue;
 823                evt->ext_list = NULL;
 824                list_add_tail(&evt->queue_list, &queue->free);
 825        }
 826
 827        LEAVE;
 828        return 0;
 829}
 830
 831/**
 832 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
 833 * @vhost:      ibmvfc host who owns the event pool
 834 * @queue:      ibmvfc queue struct
 835 *
 836 **/
 837static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost,
 838                                   struct ibmvfc_queue *queue)
 839{
 840        int i;
 841        struct ibmvfc_event_pool *pool = &queue->evt_pool;
 842
 843        ENTER;
 844        for (i = 0; i < pool->size; ++i) {
 845                list_del(&pool->events[i].queue_list);
 846                BUG_ON(atomic_read(&pool->events[i].free) != 1);
 847                if (pool->events[i].ext_list)
 848                        dma_pool_free(vhost->sg_pool,
 849                                      pool->events[i].ext_list,
 850                                      pool->events[i].ext_list_token);
 851        }
 852
 853        kfree(pool->events);
 854        dma_free_coherent(vhost->dev,
 855                          pool->size * sizeof(*pool->iu_storage),
 856                          pool->iu_storage, pool->iu_token);
 857        LEAVE;
 858}
 859
 860/**
 861 * ibmvfc_free_queue - Deallocate queue
 862 * @vhost:      ibmvfc host struct
 863 * @queue:      ibmvfc queue struct
 864 *
 865 * Unmaps dma and deallocates page for messages
 866 **/
 867static void ibmvfc_free_queue(struct ibmvfc_host *vhost,
 868                              struct ibmvfc_queue *queue)
 869{
 870        struct device *dev = vhost->dev;
 871
 872        dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 873        free_page((unsigned long)queue->msgs.handle);
 874        queue->msgs.handle = NULL;
 875
 876        ibmvfc_free_event_pool(vhost, queue);
 877}
 878
 879/**
 880 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 881 * @vhost:      ibmvfc host struct
 882 *
 883 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 884 * the crq with the hypervisor.
 885 **/
 886static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 887{
 888        long rc = 0;
 889        struct vio_dev *vdev = to_vio_dev(vhost->dev);
 890        struct ibmvfc_queue *crq = &vhost->crq;
 891
 892        ibmvfc_dbg(vhost, "Releasing CRQ\n");
 893        free_irq(vdev->irq, vhost);
 894        tasklet_kill(&vhost->tasklet);
 895        do {
 896                if (rc)
 897                        msleep(100);
 898                rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 899        } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 900
 901        vhost->state = IBMVFC_NO_CRQ;
 902        vhost->logged_in = 0;
 903
 904        ibmvfc_free_queue(vhost, crq);
 905}
 906
 907/**
 908 * ibmvfc_reenable_crq_queue - reenables the CRQ
 909 * @vhost:      ibmvfc host struct
 910 *
 911 * Return value:
 912 *      0 on success / other on failure
 913 **/
 914static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 915{
 916        int rc = 0;
 917        struct vio_dev *vdev = to_vio_dev(vhost->dev);
 918        unsigned long flags;
 919
 920        ibmvfc_release_sub_crqs(vhost);
 921
 922        /* Re-enable the CRQ */
 923        do {
 924                if (rc)
 925                        msleep(100);
 926                rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 927        } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 928
 929        if (rc)
 930                dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 931
 932        spin_lock_irqsave(vhost->host->host_lock, flags);
 933        spin_lock(vhost->crq.q_lock);
 934        vhost->do_enquiry = 1;
 935        vhost->using_channels = 0;
 936        spin_unlock(vhost->crq.q_lock);
 937        spin_unlock_irqrestore(vhost->host->host_lock, flags);
 938
 939        ibmvfc_init_sub_crqs(vhost);
 940
 941        return rc;
 942}
 943
 944/**
 945 * ibmvfc_reset_crq - resets a crq after a failure
 946 * @vhost:      ibmvfc host struct
 947 *
 948 * Return value:
 949 *      0 on success / other on failure
 950 **/
 951static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 952{
 953        int rc = 0;
 954        unsigned long flags;
 955        struct vio_dev *vdev = to_vio_dev(vhost->dev);
 956        struct ibmvfc_queue *crq = &vhost->crq;
 957
 958        ibmvfc_release_sub_crqs(vhost);
 959
 960        /* Close the CRQ */
 961        do {
 962                if (rc)
 963                        msleep(100);
 964                rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 965        } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 966
 967        spin_lock_irqsave(vhost->host->host_lock, flags);
 968        spin_lock(vhost->crq.q_lock);
 969        vhost->state = IBMVFC_NO_CRQ;
 970        vhost->logged_in = 0;
 971        vhost->do_enquiry = 1;
 972        vhost->using_channels = 0;
 973
 974        /* Clean out the queue */
 975        memset(crq->msgs.crq, 0, PAGE_SIZE);
 976        crq->cur = 0;
 977
 978        /* And re-open it again */
 979        rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 980                                crq->msg_token, PAGE_SIZE);
 981
 982        if (rc == H_CLOSED)
 983                /* Adapter is good, but other end is not ready */
 984                dev_warn(vhost->dev, "Partner adapter not ready\n");
 985        else if (rc != 0)
 986                dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 987
 988        spin_unlock(vhost->crq.q_lock);
 989        spin_unlock_irqrestore(vhost->host->host_lock, flags);
 990
 991        ibmvfc_init_sub_crqs(vhost);
 992
 993        return rc;
 994}
 995
 996/**
 997 * ibmvfc_valid_event - Determines if event is valid.
 998 * @pool:       event_pool that contains the event
 999 * @evt:        ibmvfc event to be checked for validity
1000 *
1001 * Return value:
1002 *      1 if event is valid / 0 if event is not valid
1003 **/
1004static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
1005                              struct ibmvfc_event *evt)
1006{
1007        int index = evt - pool->events;
1008        if (index < 0 || index >= pool->size)   /* outside of bounds */
1009                return 0;
1010        if (evt != pool->events + index)        /* unaligned */
1011                return 0;
1012        return 1;
1013}
1014
1015/**
1016 * ibmvfc_free_event - Free the specified event
1017 * @evt:        ibmvfc_event to be freed
1018 *
1019 **/
1020static void ibmvfc_free_event(struct ibmvfc_event *evt)
1021{
1022        struct ibmvfc_event_pool *pool = &evt->queue->evt_pool;
1023        unsigned long flags;
1024
1025        BUG_ON(!ibmvfc_valid_event(pool, evt));
1026        BUG_ON(atomic_inc_return(&evt->free) != 1);
1027        BUG_ON(atomic_dec_and_test(&evt->active));
1028
1029        spin_lock_irqsave(&evt->queue->l_lock, flags);
1030        list_add_tail(&evt->queue_list, &evt->queue->free);
1031        if (evt->eh_comp)
1032                complete(evt->eh_comp);
1033        spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1034}
1035
1036/**
1037 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
1038 * @evt:        ibmvfc event struct
1039 *
1040 * This function does not setup any error status, that must be done
1041 * before this function gets called.
1042 **/
1043static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
1044{
1045        struct scsi_cmnd *cmnd = evt->cmnd;
1046
1047        if (cmnd) {
1048                scsi_dma_unmap(cmnd);
1049                cmnd->scsi_done(cmnd);
1050        }
1051
1052        ibmvfc_free_event(evt);
1053}
1054
1055/**
1056 * ibmvfc_complete_purge - Complete failed command list
1057 * @purge_list:         list head of failed commands
1058 *
1059 * This function runs completions on commands to fail as a result of a
1060 * host reset or platform migration.
1061 **/
1062static void ibmvfc_complete_purge(struct list_head *purge_list)
1063{
1064        struct ibmvfc_event *evt, *pos;
1065
1066        list_for_each_entry_safe(evt, pos, purge_list, queue_list) {
1067                list_del(&evt->queue_list);
1068                ibmvfc_trc_end(evt);
1069                evt->done(evt);
1070        }
1071}
1072
1073/**
1074 * ibmvfc_fail_request - Fail request with specified error code
1075 * @evt:                ibmvfc event struct
1076 * @error_code: error code to fail request with
1077 *
1078 * Return value:
1079 *      none
1080 **/
1081static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
1082{
1083        /*
1084         * Anything we are failing should still be active. Otherwise, it
1085         * implies we already got a response for the command and are doing
1086         * something bad like double completing it.
1087         */
1088        BUG_ON(!atomic_dec_and_test(&evt->active));
1089        if (evt->cmnd) {
1090                evt->cmnd->result = (error_code << 16);
1091                evt->done = ibmvfc_scsi_eh_done;
1092        } else
1093                evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
1094
1095        del_timer(&evt->timer);
1096}
1097
1098/**
1099 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
1100 * @vhost:              ibmvfc host struct
1101 * @error_code: error code to fail requests with
1102 *
1103 * Return value:
1104 *      none
1105 **/
1106static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
1107{
1108        struct ibmvfc_event *evt, *pos;
1109        struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
1110        unsigned long flags;
1111        int hwqs = 0;
1112        int i;
1113
1114        if (vhost->using_channels)
1115                hwqs = vhost->scsi_scrqs.active_queues;
1116
1117        ibmvfc_dbg(vhost, "Purging all requests\n");
1118        spin_lock_irqsave(&vhost->crq.l_lock, flags);
1119        list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list)
1120                ibmvfc_fail_request(evt, error_code);
1121        list_splice_init(&vhost->crq.sent, &vhost->purge);
1122        spin_unlock_irqrestore(&vhost->crq.l_lock, flags);
1123
1124        for (i = 0; i < hwqs; i++) {
1125                spin_lock_irqsave(queues[i].q_lock, flags);
1126                spin_lock(&queues[i].l_lock);
1127                list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list)
1128                        ibmvfc_fail_request(evt, error_code);
1129                list_splice_init(&queues[i].sent, &vhost->purge);
1130                spin_unlock(&queues[i].l_lock);
1131                spin_unlock_irqrestore(queues[i].q_lock, flags);
1132        }
1133}
1134
1135/**
1136 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
1137 * @vhost:      struct ibmvfc host to reset
1138 **/
1139static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
1140{
1141        ibmvfc_purge_requests(vhost, DID_ERROR);
1142        ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
1143        ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
1144}
1145
1146/**
1147 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
1148 * @vhost:      struct ibmvfc host to reset
1149 **/
1150static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
1151{
1152        if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
1153            !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
1154                scsi_block_requests(vhost->host);
1155                ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
1156                vhost->job_step = ibmvfc_npiv_logout;
1157                wake_up(&vhost->work_wait_q);
1158        } else
1159                ibmvfc_hard_reset_host(vhost);
1160}
1161
1162/**
1163 * ibmvfc_reset_host - Reset the connection to the server
1164 * @vhost:      ibmvfc host struct
1165 **/
1166static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
1167{
1168        unsigned long flags;
1169
1170        spin_lock_irqsave(vhost->host->host_lock, flags);
1171        __ibmvfc_reset_host(vhost);
1172        spin_unlock_irqrestore(vhost->host->host_lock, flags);
1173}
1174
1175/**
1176 * ibmvfc_retry_host_init - Retry host initialization if allowed
1177 * @vhost:      ibmvfc host struct
1178 *
1179 * Returns: 1 if init will be retried / 0 if not
1180 *
1181 **/
1182static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
1183{
1184        int retry = 0;
1185
1186        if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
1187                vhost->delay_init = 1;
1188                if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
1189                        dev_err(vhost->dev,
1190                                "Host initialization retries exceeded. Taking adapter offline\n");
1191                        ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
1192                } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
1193                        __ibmvfc_reset_host(vhost);
1194                else {
1195                        ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
1196                        retry = 1;
1197                }
1198        }
1199
1200        wake_up(&vhost->work_wait_q);
1201        return retry;
1202}
1203
1204/**
1205 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
1206 * @starget:    scsi target struct
1207 *
1208 * Return value:
1209 *      ibmvfc_target struct / NULL if not found
1210 **/
1211static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
1212{
1213        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1214        struct ibmvfc_host *vhost = shost_priv(shost);
1215        struct ibmvfc_target *tgt;
1216
1217        list_for_each_entry(tgt, &vhost->targets, queue)
1218                if (tgt->target_id == starget->id) {
1219                        kref_get(&tgt->kref);
1220                        return tgt;
1221                }
1222        return NULL;
1223}
1224
1225/**
1226 * ibmvfc_get_target - Find the specified scsi_target
1227 * @starget:    scsi target struct
1228 *
1229 * Return value:
1230 *      ibmvfc_target struct / NULL if not found
1231 **/
1232static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
1233{
1234        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1235        struct ibmvfc_target *tgt;
1236        unsigned long flags;
1237
1238        spin_lock_irqsave(shost->host_lock, flags);
1239        tgt = __ibmvfc_get_target(starget);
1240        spin_unlock_irqrestore(shost->host_lock, flags);
1241        return tgt;
1242}
1243
1244/**
1245 * ibmvfc_get_host_speed - Get host port speed
1246 * @shost:              scsi host struct
1247 *
1248 * Return value:
1249 *      none
1250 **/
1251static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
1252{
1253        struct ibmvfc_host *vhost = shost_priv(shost);
1254        unsigned long flags;
1255
1256        spin_lock_irqsave(shost->host_lock, flags);
1257        if (vhost->state == IBMVFC_ACTIVE) {
1258                switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
1259                case 1:
1260                        fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
1261                        break;
1262                case 2:
1263                        fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
1264                        break;
1265                case 4:
1266                        fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
1267                        break;
1268                case 8:
1269                        fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
1270                        break;
1271                case 10:
1272                        fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
1273                        break;
1274                case 16:
1275                        fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
1276                        break;
1277                default:
1278                        ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
1279                                   be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
1280                        fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1281                        break;
1282                }
1283        } else
1284                fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1285        spin_unlock_irqrestore(shost->host_lock, flags);
1286}
1287
1288/**
1289 * ibmvfc_get_host_port_state - Get host port state
1290 * @shost:              scsi host struct
1291 *
1292 * Return value:
1293 *      none
1294 **/
1295static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1296{
1297        struct ibmvfc_host *vhost = shost_priv(shost);
1298        unsigned long flags;
1299
1300        spin_lock_irqsave(shost->host_lock, flags);
1301        switch (vhost->state) {
1302        case IBMVFC_INITIALIZING:
1303        case IBMVFC_ACTIVE:
1304                fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1305                break;
1306        case IBMVFC_LINK_DOWN:
1307                fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1308                break;
1309        case IBMVFC_LINK_DEAD:
1310        case IBMVFC_HOST_OFFLINE:
1311                fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1312                break;
1313        case IBMVFC_HALTED:
1314                fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1315                break;
1316        case IBMVFC_NO_CRQ:
1317                fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1318                break;
1319        default:
1320                ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1321                fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1322                break;
1323        }
1324        spin_unlock_irqrestore(shost->host_lock, flags);
1325}
1326
1327/**
1328 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1329 * @rport:              rport struct
1330 * @timeout:    timeout value
1331 *
1332 * Return value:
1333 *      none
1334 **/
1335static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1336{
1337        if (timeout)
1338                rport->dev_loss_tmo = timeout;
1339        else
1340                rport->dev_loss_tmo = 1;
1341}
1342
1343/**
1344 * ibmvfc_release_tgt - Free memory allocated for a target
1345 * @kref:               kref struct
1346 *
1347 **/
1348static void ibmvfc_release_tgt(struct kref *kref)
1349{
1350        struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1351        kfree(tgt);
1352}
1353
1354/**
1355 * ibmvfc_get_starget_node_name - Get SCSI target's node name
1356 * @starget:    scsi target struct
1357 *
1358 * Return value:
1359 *      none
1360 **/
1361static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1362{
1363        struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1364        fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1365        if (tgt)
1366                kref_put(&tgt->kref, ibmvfc_release_tgt);
1367}
1368
1369/**
1370 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1371 * @starget:    scsi target struct
1372 *
1373 * Return value:
1374 *      none
1375 **/
1376static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1377{
1378        struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1379        fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1380        if (tgt)
1381                kref_put(&tgt->kref, ibmvfc_release_tgt);
1382}
1383
1384/**
1385 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1386 * @starget:    scsi target struct
1387 *
1388 * Return value:
1389 *      none
1390 **/
1391static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1392{
1393        struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1394        fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1395        if (tgt)
1396                kref_put(&tgt->kref, ibmvfc_release_tgt);
1397}
1398
1399/**
1400 * ibmvfc_wait_while_resetting - Wait while the host resets
1401 * @vhost:              ibmvfc host struct
1402 *
1403 * Return value:
1404 *      0 on success / other on failure
1405 **/
1406static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1407{
1408        long timeout = wait_event_timeout(vhost->init_wait_q,
1409                                          ((vhost->state == IBMVFC_ACTIVE ||
1410                                            vhost->state == IBMVFC_HOST_OFFLINE ||
1411                                            vhost->state == IBMVFC_LINK_DEAD) &&
1412                                           vhost->action == IBMVFC_HOST_ACTION_NONE),
1413                                          (init_timeout * HZ));
1414
1415        return timeout ? 0 : -EIO;
1416}
1417
1418/**
1419 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1420 * @shost:              scsi host struct
1421 *
1422 * Return value:
1423 *      0 on success / other on failure
1424 **/
1425static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1426{
1427        struct ibmvfc_host *vhost = shost_priv(shost);
1428
1429        dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1430        ibmvfc_reset_host(vhost);
1431        return ibmvfc_wait_while_resetting(vhost);
1432}
1433
1434/**
1435 * ibmvfc_gather_partition_info - Gather info about the LPAR
1436 * @vhost:      ibmvfc host struct
1437 *
1438 * Return value:
1439 *      none
1440 **/
1441static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1442{
1443        struct device_node *rootdn;
1444        const char *name;
1445        const unsigned int *num;
1446
1447        rootdn = of_find_node_by_path("/");
1448        if (!rootdn)
1449                return;
1450
1451        name = of_get_property(rootdn, "ibm,partition-name", NULL);
1452        if (name)
1453                strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1454        num = of_get_property(rootdn, "ibm,partition-no", NULL);
1455        if (num)
1456                vhost->partition_number = *num;
1457        of_node_put(rootdn);
1458}
1459
1460/**
1461 * ibmvfc_set_login_info - Setup info for NPIV login
1462 * @vhost:      ibmvfc host struct
1463 *
1464 * Return value:
1465 *      none
1466 **/
1467static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1468{
1469        struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1470        struct ibmvfc_queue *async_crq = &vhost->async_crq;
1471        struct device_node *of_node = vhost->dev->of_node;
1472        const char *location;
1473
1474        memset(login_info, 0, sizeof(*login_info));
1475
1476        login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1477        login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1478        login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1479        login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1480        login_info->partition_num = cpu_to_be32(vhost->partition_number);
1481        login_info->vfc_frame_version = cpu_to_be32(1);
1482        login_info->fcp_version = cpu_to_be16(3);
1483        login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1484        if (vhost->client_migrated)
1485                login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1486
1487        login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1488        login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN);
1489
1490        if (vhost->mq_enabled || vhost->using_channels)
1491                login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
1492
1493        login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1494        login_info->async.len = cpu_to_be32(async_crq->size *
1495                                            sizeof(*async_crq->msgs.async));
1496        strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1497        strncpy(login_info->device_name,
1498                dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1499
1500        location = of_get_property(of_node, "ibm,loc-code", NULL);
1501        location = location ? location : dev_name(vhost->dev);
1502        strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1503}
1504
1505/**
1506 * ibmvfc_get_event - Gets the next free event in pool
1507 * @queue:      ibmvfc queue struct
1508 *
1509 * Returns a free event from the pool.
1510 **/
1511static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_queue *queue)
1512{
1513        struct ibmvfc_event *evt;
1514        unsigned long flags;
1515
1516        spin_lock_irqsave(&queue->l_lock, flags);
1517        BUG_ON(list_empty(&queue->free));
1518        evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1519        atomic_set(&evt->free, 0);
1520        list_del(&evt->queue_list);
1521        spin_unlock_irqrestore(&queue->l_lock, flags);
1522        return evt;
1523}
1524
1525/**
1526 * ibmvfc_locked_done - Calls evt completion with host_lock held
1527 * @evt:        ibmvfc evt to complete
1528 *
1529 * All non-scsi command completion callbacks have the expectation that the
1530 * host_lock is held. This callback is used by ibmvfc_init_event to wrap a
1531 * MAD evt with the host_lock.
1532 **/
1533static void ibmvfc_locked_done(struct ibmvfc_event *evt)
1534{
1535        unsigned long flags;
1536
1537        spin_lock_irqsave(evt->vhost->host->host_lock, flags);
1538        evt->_done(evt);
1539        spin_unlock_irqrestore(evt->vhost->host->host_lock, flags);
1540}
1541
1542/**
1543 * ibmvfc_init_event - Initialize fields in an event struct that are always
1544 *                              required.
1545 * @evt:        The event
1546 * @done:       Routine to call when the event is responded to
1547 * @format:     SRP or MAD format
1548 **/
1549static void ibmvfc_init_event(struct ibmvfc_event *evt,
1550                              void (*done) (struct ibmvfc_event *), u8 format)
1551{
1552        evt->cmnd = NULL;
1553        evt->sync_iu = NULL;
1554        evt->eh_comp = NULL;
1555        evt->crq.format = format;
1556        if (format == IBMVFC_CMD_FORMAT)
1557                evt->done = done;
1558        else {
1559                evt->_done = done;
1560                evt->done = ibmvfc_locked_done;
1561        }
1562        evt->hwq = 0;
1563}
1564
1565/**
1566 * ibmvfc_map_sg_list - Initialize scatterlist
1567 * @scmd:       scsi command struct
1568 * @nseg:       number of scatterlist segments
1569 * @md: memory descriptor list to initialize
1570 **/
1571static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1572                               struct srp_direct_buf *md)
1573{
1574        int i;
1575        struct scatterlist *sg;
1576
1577        scsi_for_each_sg(scmd, sg, nseg, i) {
1578                md[i].va = cpu_to_be64(sg_dma_address(sg));
1579                md[i].len = cpu_to_be32(sg_dma_len(sg));
1580                md[i].key = 0;
1581        }
1582}
1583
1584/**
1585 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields
1586 * @scmd:               struct scsi_cmnd with the scatterlist
1587 * @evt:                ibmvfc event struct
1588 * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1589 * @dev:                device for which to map dma memory
1590 *
1591 * Returns:
1592 *      0 on success / non-zero on failure
1593 **/
1594static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1595                              struct ibmvfc_event *evt,
1596                              struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1597{
1598
1599        int sg_mapped;
1600        struct srp_direct_buf *data = &vfc_cmd->ioba;
1601        struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1602        struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd);
1603
1604        if (cls3_error)
1605                vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1606
1607        sg_mapped = scsi_dma_map(scmd);
1608        if (!sg_mapped) {
1609                vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1610                return 0;
1611        } else if (unlikely(sg_mapped < 0)) {
1612                if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1613                        scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1614                return sg_mapped;
1615        }
1616
1617        if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1618                vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1619                iu->add_cdb_len |= IBMVFC_WRDATA;
1620        } else {
1621                vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1622                iu->add_cdb_len |= IBMVFC_RDDATA;
1623        }
1624
1625        if (sg_mapped == 1) {
1626                ibmvfc_map_sg_list(scmd, sg_mapped, data);
1627                return 0;
1628        }
1629
1630        vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1631
1632        if (!evt->ext_list) {
1633                evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1634                                               &evt->ext_list_token);
1635
1636                if (!evt->ext_list) {
1637                        scsi_dma_unmap(scmd);
1638                        if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1639                                scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1640                        return -ENOMEM;
1641                }
1642        }
1643
1644        ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1645
1646        data->va = cpu_to_be64(evt->ext_list_token);
1647        data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1648        data->key = 0;
1649        return 0;
1650}
1651
1652/**
1653 * ibmvfc_timeout - Internal command timeout handler
1654 * @t:  struct ibmvfc_event that timed out
1655 *
1656 * Called when an internally generated command times out
1657 **/
1658static void ibmvfc_timeout(struct timer_list *t)
1659{
1660        struct ibmvfc_event *evt = from_timer(evt, t, timer);
1661        struct ibmvfc_host *vhost = evt->vhost;
1662        dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1663        ibmvfc_reset_host(vhost);
1664}
1665
1666/**
1667 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1668 * @evt:                event to be sent
1669 * @vhost:              ibmvfc host struct
1670 * @timeout:    timeout in seconds - 0 means do not time command
1671 *
1672 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1673 **/
1674static int ibmvfc_send_event(struct ibmvfc_event *evt,
1675                             struct ibmvfc_host *vhost, unsigned long timeout)
1676{
1677        __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1678        unsigned long flags;
1679        int rc;
1680
1681        /* Copy the IU into the transfer area */
1682        *evt->xfer_iu = evt->iu;
1683        if (evt->crq.format == IBMVFC_CMD_FORMAT)
1684                evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1685        else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1686                evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1687        else
1688                BUG();
1689
1690        timer_setup(&evt->timer, ibmvfc_timeout, 0);
1691
1692        if (timeout) {
1693                evt->timer.expires = jiffies + (timeout * HZ);
1694                add_timer(&evt->timer);
1695        }
1696
1697        spin_lock_irqsave(&evt->queue->l_lock, flags);
1698        list_add_tail(&evt->queue_list, &evt->queue->sent);
1699
1700        mb();
1701
1702        if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT)
1703                rc = ibmvfc_send_sub_crq(vhost,
1704                                         evt->queue->vios_cookie,
1705                                         be64_to_cpu(crq_as_u64[0]),
1706                                         be64_to_cpu(crq_as_u64[1]),
1707                                         0, 0);
1708        else
1709                rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1710                                     be64_to_cpu(crq_as_u64[1]));
1711
1712        if (rc) {
1713                list_del(&evt->queue_list);
1714                spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1715                del_timer(&evt->timer);
1716
1717                /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1718                 * Firmware will send a CRQ with a transport event (0xFF) to
1719                 * tell this client what has happened to the transport. This
1720                 * will be handled in ibmvfc_handle_crq()
1721                 */
1722                if (rc == H_CLOSED) {
1723                        if (printk_ratelimit())
1724                                dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1725                        if (evt->cmnd)
1726                                scsi_dma_unmap(evt->cmnd);
1727                        ibmvfc_free_event(evt);
1728                        return SCSI_MLQUEUE_HOST_BUSY;
1729                }
1730
1731                dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1732                if (evt->cmnd) {
1733                        evt->cmnd->result = DID_ERROR << 16;
1734                        evt->done = ibmvfc_scsi_eh_done;
1735                } else
1736                        evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1737
1738                evt->done(evt);
1739        } else {
1740                atomic_set(&evt->active, 1);
1741                spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1742                ibmvfc_trc_start(evt);
1743        }
1744
1745        return 0;
1746}
1747
1748/**
1749 * ibmvfc_log_error - Log an error for the failed command if appropriate
1750 * @evt:        ibmvfc event to log
1751 *
1752 **/
1753static void ibmvfc_log_error(struct ibmvfc_event *evt)
1754{
1755        struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1756        struct ibmvfc_host *vhost = evt->vhost;
1757        struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1758        struct scsi_cmnd *cmnd = evt->cmnd;
1759        const char *err = unknown_error;
1760        int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1761        int logerr = 0;
1762        int rsp_code = 0;
1763
1764        if (index >= 0) {
1765                logerr = cmd_status[index].log;
1766                err = cmd_status[index].name;
1767        }
1768
1769        if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1770                return;
1771
1772        if (rsp->flags & FCP_RSP_LEN_VALID)
1773                rsp_code = rsp->data.info.rsp_code;
1774
1775        scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1776                    "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1777                    cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1778                    rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1779}
1780
1781/**
1782 * ibmvfc_relogin - Log back into the specified device
1783 * @sdev:       scsi device struct
1784 *
1785 **/
1786static void ibmvfc_relogin(struct scsi_device *sdev)
1787{
1788        struct ibmvfc_host *vhost = shost_priv(sdev->host);
1789        struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1790        struct ibmvfc_target *tgt;
1791        unsigned long flags;
1792
1793        spin_lock_irqsave(vhost->host->host_lock, flags);
1794        list_for_each_entry(tgt, &vhost->targets, queue) {
1795                if (rport == tgt->rport) {
1796                        ibmvfc_del_tgt(tgt);
1797                        break;
1798                }
1799        }
1800
1801        ibmvfc_reinit_host(vhost);
1802        spin_unlock_irqrestore(vhost->host->host_lock, flags);
1803}
1804
1805/**
1806 * ibmvfc_scsi_done - Handle responses from commands
1807 * @evt:        ibmvfc event to be handled
1808 *
1809 * Used as a callback when sending scsi cmds.
1810 **/
1811static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1812{
1813        struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1814        struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd);
1815        struct scsi_cmnd *cmnd = evt->cmnd;
1816        u32 rsp_len = 0;
1817        u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1818
1819        if (cmnd) {
1820                if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1821                        scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1822                else if (rsp->flags & FCP_RESID_UNDER)
1823                        scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1824                else
1825                        scsi_set_resid(cmnd, 0);
1826
1827                if (vfc_cmd->status) {
1828                        cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd);
1829
1830                        if (rsp->flags & FCP_RSP_LEN_VALID)
1831                                rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1832                        if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1833                                sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1834                        if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1835                                memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1836                        if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1837                            (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1838                                ibmvfc_relogin(cmnd->device);
1839
1840                        if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1841                                cmnd->result = (DID_ERROR << 16);
1842
1843                        ibmvfc_log_error(evt);
1844                }
1845
1846                if (!cmnd->result &&
1847                    (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1848                        cmnd->result = (DID_ERROR << 16);
1849
1850                scsi_dma_unmap(cmnd);
1851                cmnd->scsi_done(cmnd);
1852        }
1853
1854        ibmvfc_free_event(evt);
1855}
1856
1857/**
1858 * ibmvfc_host_chkready - Check if the host can accept commands
1859 * @vhost:       struct ibmvfc host
1860 *
1861 * Returns:
1862 *      1 if host can accept command / 0 if not
1863 **/
1864static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1865{
1866        int result = 0;
1867
1868        switch (vhost->state) {
1869        case IBMVFC_LINK_DEAD:
1870        case IBMVFC_HOST_OFFLINE:
1871                result = DID_NO_CONNECT << 16;
1872                break;
1873        case IBMVFC_NO_CRQ:
1874        case IBMVFC_INITIALIZING:
1875        case IBMVFC_HALTED:
1876        case IBMVFC_LINK_DOWN:
1877                result = DID_REQUEUE << 16;
1878                break;
1879        case IBMVFC_ACTIVE:
1880                result = 0;
1881                break;
1882        }
1883
1884        return result;
1885}
1886
1887static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev)
1888{
1889        struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1890        struct ibmvfc_host *vhost = evt->vhost;
1891        struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
1892        struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1893        struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1894        size_t offset;
1895
1896        memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1897        if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
1898                offset = offsetof(struct ibmvfc_cmd, v2.rsp);
1899                vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name);
1900        } else
1901                offset = offsetof(struct ibmvfc_cmd, v1.rsp);
1902        vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset);
1903        vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp));
1904        vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1905        vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu));
1906        vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp));
1907        vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1908        vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1909        int_to_scsilun(sdev->lun, &iu->lun);
1910
1911        return vfc_cmd;
1912}
1913
1914/**
1915 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1916 * @shost:      scsi host struct
1917 * @cmnd:       struct scsi_cmnd to be executed
1918 *
1919 * Returns:
1920 *      0 on success / other on failure
1921 **/
1922static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
1923{
1924        struct ibmvfc_host *vhost = shost_priv(shost);
1925        struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1926        struct ibmvfc_cmd *vfc_cmd;
1927        struct ibmvfc_fcp_cmd_iu *iu;
1928        struct ibmvfc_event *evt;
1929        u32 tag_and_hwq = blk_mq_unique_tag(cmnd->request);
1930        u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq);
1931        u16 scsi_channel;
1932        int rc;
1933
1934        if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1935            unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1936                cmnd->result = rc;
1937                cmnd->scsi_done(cmnd);
1938                return 0;
1939        }
1940
1941        cmnd->result = (DID_OK << 16);
1942        if (vhost->using_channels) {
1943                scsi_channel = hwq % vhost->scsi_scrqs.active_queues;
1944                evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]);
1945                evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
1946        } else
1947                evt = ibmvfc_get_event(&vhost->crq);
1948
1949        ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1950        evt->cmnd = cmnd;
1951
1952        vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device);
1953        iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1954
1955        iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1956        memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
1957
1958        if (cmnd->flags & SCMD_TAGGED) {
1959                vfc_cmd->task_tag = cpu_to_be64(cmnd->tag);
1960                iu->pri_task_attr = IBMVFC_SIMPLE_TASK;
1961        }
1962
1963        vfc_cmd->correlation = cpu_to_be64((u64)evt);
1964
1965        if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1966                return ibmvfc_send_event(evt, vhost, 0);
1967
1968        ibmvfc_free_event(evt);
1969        if (rc == -ENOMEM)
1970                return SCSI_MLQUEUE_HOST_BUSY;
1971
1972        if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1973                scmd_printk(KERN_ERR, cmnd,
1974                            "Failed to map DMA buffer for command. rc=%d\n", rc);
1975
1976        cmnd->result = DID_ERROR << 16;
1977        cmnd->scsi_done(cmnd);
1978        return 0;
1979}
1980
1981/**
1982 * ibmvfc_sync_completion - Signal that a synchronous command has completed
1983 * @evt:        ibmvfc event struct
1984 *
1985 **/
1986static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1987{
1988        /* copy the response back */
1989        if (evt->sync_iu)
1990                *evt->sync_iu = *evt->xfer_iu;
1991
1992        complete(&evt->comp);
1993}
1994
1995/**
1996 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1997 * @evt:        struct ibmvfc_event
1998 *
1999 **/
2000static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
2001{
2002        struct ibmvfc_host *vhost = evt->vhost;
2003
2004        ibmvfc_free_event(evt);
2005        vhost->aborting_passthru = 0;
2006        dev_info(vhost->dev, "Passthru command cancelled\n");
2007}
2008
2009/**
2010 * ibmvfc_bsg_timeout - Handle a BSG timeout
2011 * @job:        struct bsg_job that timed out
2012 *
2013 * Returns:
2014 *      0 on success / other on failure
2015 **/
2016static int ibmvfc_bsg_timeout(struct bsg_job *job)
2017{
2018        struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2019        unsigned long port_id = (unsigned long)job->dd_data;
2020        struct ibmvfc_event *evt;
2021        struct ibmvfc_tmf *tmf;
2022        unsigned long flags;
2023        int rc;
2024
2025        ENTER;
2026        spin_lock_irqsave(vhost->host->host_lock, flags);
2027        if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
2028                __ibmvfc_reset_host(vhost);
2029                spin_unlock_irqrestore(vhost->host->host_lock, flags);
2030                return 0;
2031        }
2032
2033        vhost->aborting_passthru = 1;
2034        evt = ibmvfc_get_event(&vhost->crq);
2035        ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
2036
2037        tmf = &evt->iu.tmf;
2038        memset(tmf, 0, sizeof(*tmf));
2039        tmf->common.version = cpu_to_be32(1);
2040        tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2041        tmf->common.length = cpu_to_be16(sizeof(*tmf));
2042        tmf->scsi_id = cpu_to_be64(port_id);
2043        tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2044        tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
2045        rc = ibmvfc_send_event(evt, vhost, default_timeout);
2046
2047        if (rc != 0) {
2048                vhost->aborting_passthru = 0;
2049                dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
2050                rc = -EIO;
2051        } else
2052                dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
2053                         port_id);
2054
2055        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2056
2057        LEAVE;
2058        return rc;
2059}
2060
2061/**
2062 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
2063 * @vhost:              struct ibmvfc_host to send command
2064 * @port_id:    port ID to send command
2065 *
2066 * Returns:
2067 *      0 on success / other on failure
2068 **/
2069static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
2070{
2071        struct ibmvfc_port_login *plogi;
2072        struct ibmvfc_target *tgt;
2073        struct ibmvfc_event *evt;
2074        union ibmvfc_iu rsp_iu;
2075        unsigned long flags;
2076        int rc = 0, issue_login = 1;
2077
2078        ENTER;
2079        spin_lock_irqsave(vhost->host->host_lock, flags);
2080        list_for_each_entry(tgt, &vhost->targets, queue) {
2081                if (tgt->scsi_id == port_id) {
2082                        issue_login = 0;
2083                        break;
2084                }
2085        }
2086
2087        if (!issue_login)
2088                goto unlock_out;
2089        if (unlikely((rc = ibmvfc_host_chkready(vhost))))
2090                goto unlock_out;
2091
2092        evt = ibmvfc_get_event(&vhost->crq);
2093        ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2094        plogi = &evt->iu.plogi;
2095        memset(plogi, 0, sizeof(*plogi));
2096        plogi->common.version = cpu_to_be32(1);
2097        plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
2098        plogi->common.length = cpu_to_be16(sizeof(*plogi));
2099        plogi->scsi_id = cpu_to_be64(port_id);
2100        evt->sync_iu = &rsp_iu;
2101        init_completion(&evt->comp);
2102
2103        rc = ibmvfc_send_event(evt, vhost, default_timeout);
2104        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2105
2106        if (rc)
2107                return -EIO;
2108
2109        wait_for_completion(&evt->comp);
2110
2111        if (rsp_iu.plogi.common.status)
2112                rc = -EIO;
2113
2114        spin_lock_irqsave(vhost->host->host_lock, flags);
2115        ibmvfc_free_event(evt);
2116unlock_out:
2117        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2118        LEAVE;
2119        return rc;
2120}
2121
2122/**
2123 * ibmvfc_bsg_request - Handle a BSG request
2124 * @job:        struct bsg_job to be executed
2125 *
2126 * Returns:
2127 *      0 on success / other on failure
2128 **/
2129static int ibmvfc_bsg_request(struct bsg_job *job)
2130{
2131        struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2132        struct fc_rport *rport = fc_bsg_to_rport(job);
2133        struct ibmvfc_passthru_mad *mad;
2134        struct ibmvfc_event *evt;
2135        union ibmvfc_iu rsp_iu;
2136        unsigned long flags, port_id = -1;
2137        struct fc_bsg_request *bsg_request = job->request;
2138        struct fc_bsg_reply *bsg_reply = job->reply;
2139        unsigned int code = bsg_request->msgcode;
2140        int rc = 0, req_seg, rsp_seg, issue_login = 0;
2141        u32 fc_flags, rsp_len;
2142
2143        ENTER;
2144        bsg_reply->reply_payload_rcv_len = 0;
2145        if (rport)
2146                port_id = rport->port_id;
2147
2148        switch (code) {
2149        case FC_BSG_HST_ELS_NOLOGIN:
2150                port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
2151                        (bsg_request->rqst_data.h_els.port_id[1] << 8) |
2152                        bsg_request->rqst_data.h_els.port_id[2];
2153                fallthrough;
2154        case FC_BSG_RPT_ELS:
2155                fc_flags = IBMVFC_FC_ELS;
2156                break;
2157        case FC_BSG_HST_CT:
2158                issue_login = 1;
2159                port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
2160                        (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
2161                        bsg_request->rqst_data.h_ct.port_id[2];
2162                fallthrough;
2163        case FC_BSG_RPT_CT:
2164                fc_flags = IBMVFC_FC_CT_IU;
2165                break;
2166        default:
2167                return -ENOTSUPP;
2168        }
2169
2170        if (port_id == -1)
2171                return -EINVAL;
2172        if (!mutex_trylock(&vhost->passthru_mutex))
2173                return -EBUSY;
2174
2175        job->dd_data = (void *)port_id;
2176        req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
2177                             job->request_payload.sg_cnt, DMA_TO_DEVICE);
2178
2179        if (!req_seg) {
2180                mutex_unlock(&vhost->passthru_mutex);
2181                return -ENOMEM;
2182        }
2183
2184        rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
2185                             job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2186
2187        if (!rsp_seg) {
2188                dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2189                             job->request_payload.sg_cnt, DMA_TO_DEVICE);
2190                mutex_unlock(&vhost->passthru_mutex);
2191                return -ENOMEM;
2192        }
2193
2194        if (req_seg > 1 || rsp_seg > 1) {
2195                rc = -EINVAL;
2196                goto out;
2197        }
2198
2199        if (issue_login)
2200                rc = ibmvfc_bsg_plogi(vhost, port_id);
2201
2202        spin_lock_irqsave(vhost->host->host_lock, flags);
2203
2204        if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
2205            unlikely((rc = ibmvfc_host_chkready(vhost)))) {
2206                spin_unlock_irqrestore(vhost->host->host_lock, flags);
2207                goto out;
2208        }
2209
2210        evt = ibmvfc_get_event(&vhost->crq);
2211        ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2212        mad = &evt->iu.passthru;
2213
2214        memset(mad, 0, sizeof(*mad));
2215        mad->common.version = cpu_to_be32(1);
2216        mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
2217        mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
2218
2219        mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
2220                offsetof(struct ibmvfc_passthru_mad, iu));
2221        mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
2222
2223        mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
2224        mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
2225        mad->iu.flags = cpu_to_be32(fc_flags);
2226        mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2227
2228        mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
2229        mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
2230        mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
2231        mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
2232        mad->iu.scsi_id = cpu_to_be64(port_id);
2233        mad->iu.tag = cpu_to_be64((u64)evt);
2234        rsp_len = be32_to_cpu(mad->iu.rsp.len);
2235
2236        evt->sync_iu = &rsp_iu;
2237        init_completion(&evt->comp);
2238        rc = ibmvfc_send_event(evt, vhost, 0);
2239        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2240
2241        if (rc) {
2242                rc = -EIO;
2243                goto out;
2244        }
2245
2246        wait_for_completion(&evt->comp);
2247
2248        if (rsp_iu.passthru.common.status)
2249                rc = -EIO;
2250        else
2251                bsg_reply->reply_payload_rcv_len = rsp_len;
2252
2253        spin_lock_irqsave(vhost->host->host_lock, flags);
2254        ibmvfc_free_event(evt);
2255        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2256        bsg_reply->result = rc;
2257        bsg_job_done(job, bsg_reply->result,
2258                       bsg_reply->reply_payload_rcv_len);
2259        rc = 0;
2260out:
2261        dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2262                     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2263        dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
2264                     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2265        mutex_unlock(&vhost->passthru_mutex);
2266        LEAVE;
2267        return rc;
2268}
2269
2270/**
2271 * ibmvfc_reset_device - Reset the device with the specified reset type
2272 * @sdev:       scsi device to reset
2273 * @type:       reset type
2274 * @desc:       reset type description for log messages
2275 *
2276 * Returns:
2277 *      0 on success / other on failure
2278 **/
2279static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
2280{
2281        struct ibmvfc_host *vhost = shost_priv(sdev->host);
2282        struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2283        struct ibmvfc_cmd *tmf;
2284        struct ibmvfc_event *evt = NULL;
2285        union ibmvfc_iu rsp_iu;
2286        struct ibmvfc_fcp_cmd_iu *iu;
2287        struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2288        int rsp_rc = -EBUSY;
2289        unsigned long flags;
2290        int rsp_code = 0;
2291
2292        spin_lock_irqsave(vhost->host->host_lock, flags);
2293        if (vhost->state == IBMVFC_ACTIVE) {
2294                if (vhost->using_channels)
2295                        evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]);
2296                else
2297                        evt = ibmvfc_get_event(&vhost->crq);
2298
2299                ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2300                tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2301                iu = ibmvfc_get_fcp_iu(vhost, tmf);
2302
2303                tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2304                if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2305                        tmf->target_wwpn = cpu_to_be64(rport->port_name);
2306                iu->tmf_flags = type;
2307                evt->sync_iu = &rsp_iu;
2308
2309                init_completion(&evt->comp);
2310                rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2311        }
2312        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2313
2314        if (rsp_rc != 0) {
2315                sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2316                            desc, rsp_rc);
2317                return -EIO;
2318        }
2319
2320        sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2321        wait_for_completion(&evt->comp);
2322
2323        if (rsp_iu.cmd.status)
2324                rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2325
2326        if (rsp_code) {
2327                if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2328                        rsp_code = fc_rsp->data.info.rsp_code;
2329
2330                sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2331                            "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2332                            ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2333                            be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2334                            fc_rsp->scsi_status);
2335                rsp_rc = -EIO;
2336        } else
2337                sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2338
2339        spin_lock_irqsave(vhost->host->host_lock, flags);
2340        ibmvfc_free_event(evt);
2341        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2342        return rsp_rc;
2343}
2344
2345/**
2346 * ibmvfc_match_rport - Match function for specified remote port
2347 * @evt:        ibmvfc event struct
2348 * @rport:      device to match
2349 *
2350 * Returns:
2351 *      1 if event matches rport / 0 if event does not match rport
2352 **/
2353static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2354{
2355        struct fc_rport *cmd_rport;
2356
2357        if (evt->cmnd) {
2358                cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2359                if (cmd_rport == rport)
2360                        return 1;
2361        }
2362        return 0;
2363}
2364
2365/**
2366 * ibmvfc_match_target - Match function for specified target
2367 * @evt:        ibmvfc event struct
2368 * @device:     device to match (starget)
2369 *
2370 * Returns:
2371 *      1 if event matches starget / 0 if event does not match starget
2372 **/
2373static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2374{
2375        if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2376                return 1;
2377        return 0;
2378}
2379
2380/**
2381 * ibmvfc_match_lun - Match function for specified LUN
2382 * @evt:        ibmvfc event struct
2383 * @device:     device to match (sdev)
2384 *
2385 * Returns:
2386 *      1 if event matches sdev / 0 if event does not match sdev
2387 **/
2388static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2389{
2390        if (evt->cmnd && evt->cmnd->device == device)
2391                return 1;
2392        return 0;
2393}
2394
2395/**
2396 * ibmvfc_event_is_free - Check if event is free or not
2397 * @evt:        ibmvfc event struct
2398 *
2399 * Returns:
2400 *      true / false
2401 **/
2402static bool ibmvfc_event_is_free(struct ibmvfc_event *evt)
2403{
2404        struct ibmvfc_event *loop_evt;
2405
2406        list_for_each_entry(loop_evt, &evt->queue->free, queue_list)
2407                if (loop_evt == evt)
2408                        return true;
2409
2410        return false;
2411}
2412
2413/**
2414 * ibmvfc_wait_for_ops - Wait for ops to complete
2415 * @vhost:      ibmvfc host struct
2416 * @device:     device to match (starget or sdev)
2417 * @match:      match function
2418 *
2419 * Returns:
2420 *      SUCCESS / FAILED
2421 **/
2422static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2423                               int (*match) (struct ibmvfc_event *, void *))
2424{
2425        struct ibmvfc_event *evt;
2426        DECLARE_COMPLETION_ONSTACK(comp);
2427        int wait, i, q_index, q_size;
2428        unsigned long flags;
2429        signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2430        struct ibmvfc_queue *queues;
2431
2432        ENTER;
2433        if (vhost->mq_enabled && vhost->using_channels) {
2434                queues = vhost->scsi_scrqs.scrqs;
2435                q_size = vhost->scsi_scrqs.active_queues;
2436        } else {
2437                queues = &vhost->crq;
2438                q_size = 1;
2439        }
2440
2441        do {
2442                wait = 0;
2443                spin_lock_irqsave(vhost->host->host_lock, flags);
2444                for (q_index = 0; q_index < q_size; q_index++) {
2445                        spin_lock(&queues[q_index].l_lock);
2446                        for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2447                                evt = &queues[q_index].evt_pool.events[i];
2448                                if (!ibmvfc_event_is_free(evt)) {
2449                                        if (match(evt, device)) {
2450                                                evt->eh_comp = &comp;
2451                                                wait++;
2452                                        }
2453                                }
2454                        }
2455                        spin_unlock(&queues[q_index].l_lock);
2456                }
2457                spin_unlock_irqrestore(vhost->host->host_lock, flags);
2458
2459                if (wait) {
2460                        timeout = wait_for_completion_timeout(&comp, timeout);
2461
2462                        if (!timeout) {
2463                                wait = 0;
2464                                spin_lock_irqsave(vhost->host->host_lock, flags);
2465                                for (q_index = 0; q_index < q_size; q_index++) {
2466                                        spin_lock(&queues[q_index].l_lock);
2467                                        for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2468                                                evt = &queues[q_index].evt_pool.events[i];
2469                                                if (!ibmvfc_event_is_free(evt)) {
2470                                                        if (match(evt, device)) {
2471                                                                evt->eh_comp = NULL;
2472                                                                wait++;
2473                                                        }
2474                                                }
2475                                        }
2476                                        spin_unlock(&queues[q_index].l_lock);
2477                                }
2478                                spin_unlock_irqrestore(vhost->host->host_lock, flags);
2479                                if (wait)
2480                                        dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2481                                LEAVE;
2482                                return wait ? FAILED : SUCCESS;
2483                        }
2484                }
2485        } while (wait);
2486
2487        LEAVE;
2488        return SUCCESS;
2489}
2490
2491static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
2492                                            struct scsi_device *sdev,
2493                                            int type)
2494{
2495        struct ibmvfc_host *vhost = shost_priv(sdev->host);
2496        struct scsi_target *starget = scsi_target(sdev);
2497        struct fc_rport *rport = starget_to_rport(starget);
2498        struct ibmvfc_event *evt;
2499        struct ibmvfc_tmf *tmf;
2500
2501        evt = ibmvfc_get_event(queue);
2502        ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2503
2504        tmf = &evt->iu.tmf;
2505        memset(tmf, 0, sizeof(*tmf));
2506        if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
2507                tmf->common.version = cpu_to_be32(2);
2508                tmf->target_wwpn = cpu_to_be64(rport->port_name);
2509        } else {
2510                tmf->common.version = cpu_to_be32(1);
2511        }
2512        tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2513        tmf->common.length = cpu_to_be16(sizeof(*tmf));
2514        tmf->scsi_id = cpu_to_be64(rport->port_id);
2515        int_to_scsilun(sdev->lun, &tmf->lun);
2516        if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
2517                type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2518        if (vhost->state == IBMVFC_ACTIVE)
2519                tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2520        else
2521                tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2522        tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2523        tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2524
2525        init_completion(&evt->comp);
2526
2527        return evt;
2528}
2529
2530static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type)
2531{
2532        struct ibmvfc_host *vhost = shost_priv(sdev->host);
2533        struct ibmvfc_event *evt, *found_evt, *temp;
2534        struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
2535        unsigned long flags;
2536        int num_hwq, i;
2537        int fail = 0;
2538        LIST_HEAD(cancelq);
2539        u16 status;
2540
2541        ENTER;
2542        spin_lock_irqsave(vhost->host->host_lock, flags);
2543        num_hwq = vhost->scsi_scrqs.active_queues;
2544        for (i = 0; i < num_hwq; i++) {
2545                spin_lock(queues[i].q_lock);
2546                spin_lock(&queues[i].l_lock);
2547                found_evt = NULL;
2548                list_for_each_entry(evt, &queues[i].sent, queue_list) {
2549                        if (evt->cmnd && evt->cmnd->device == sdev) {
2550                                found_evt = evt;
2551                                break;
2552                        }
2553                }
2554                spin_unlock(&queues[i].l_lock);
2555
2556                if (found_evt && vhost->logged_in) {
2557                        evt = ibmvfc_init_tmf(&queues[i], sdev, type);
2558                        evt->sync_iu = &queues[i].cancel_rsp;
2559                        ibmvfc_send_event(evt, vhost, default_timeout);
2560                        list_add_tail(&evt->cancel, &cancelq);
2561                }
2562
2563                spin_unlock(queues[i].q_lock);
2564        }
2565        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2566
2567        if (list_empty(&cancelq)) {
2568                if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2569                        sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2570                return 0;
2571        }
2572
2573        sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2574
2575        list_for_each_entry_safe(evt, temp, &cancelq, cancel) {
2576                wait_for_completion(&evt->comp);
2577                status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status);
2578                list_del(&evt->cancel);
2579                ibmvfc_free_event(evt);
2580
2581                if (status != IBMVFC_MAD_SUCCESS) {
2582                        sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2583                        switch (status) {
2584                        case IBMVFC_MAD_DRIVER_FAILED:
2585                        case IBMVFC_MAD_CRQ_ERROR:
2586                        /* Host adapter most likely going through reset, return success to
2587                         * the caller will wait for the command being cancelled to get returned
2588                         */
2589                                break;
2590                        default:
2591                                fail = 1;
2592                                break;
2593                        }
2594                }
2595        }
2596
2597        if (fail)
2598                return -EIO;
2599
2600        sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2601        LEAVE;
2602        return 0;
2603}
2604
2605static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type)
2606{
2607        struct ibmvfc_host *vhost = shost_priv(sdev->host);
2608        struct ibmvfc_event *evt, *found_evt;
2609        union ibmvfc_iu rsp;
2610        int rsp_rc = -EBUSY;
2611        unsigned long flags;
2612        u16 status;
2613
2614        ENTER;
2615        found_evt = NULL;
2616        spin_lock_irqsave(vhost->host->host_lock, flags);
2617        spin_lock(&vhost->crq.l_lock);
2618        list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2619                if (evt->cmnd && evt->cmnd->device == sdev) {
2620                        found_evt = evt;
2621                        break;
2622                }
2623        }
2624        spin_unlock(&vhost->crq.l_lock);
2625
2626        if (!found_evt) {
2627                if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2628                        sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2629                spin_unlock_irqrestore(vhost->host->host_lock, flags);
2630                return 0;
2631        }
2632
2633        if (vhost->logged_in) {
2634                evt = ibmvfc_init_tmf(&vhost->crq, sdev, type);
2635                evt->sync_iu = &rsp;
2636                rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2637        }
2638
2639        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2640
2641        if (rsp_rc != 0) {
2642                sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2643                /* If failure is received, the host adapter is most likely going
2644                 through reset, return success so the caller will wait for the command
2645                 being cancelled to get returned */
2646                return 0;
2647        }
2648
2649        sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2650
2651        wait_for_completion(&evt->comp);
2652        status = be16_to_cpu(rsp.mad_common.status);
2653        spin_lock_irqsave(vhost->host->host_lock, flags);
2654        ibmvfc_free_event(evt);
2655        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2656
2657        if (status != IBMVFC_MAD_SUCCESS) {
2658                sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2659                switch (status) {
2660                case IBMVFC_MAD_DRIVER_FAILED:
2661                case IBMVFC_MAD_CRQ_ERROR:
2662                        /* Host adapter most likely going through reset, return success to
2663                         the caller will wait for the command being cancelled to get returned */
2664                        return 0;
2665                default:
2666                        return -EIO;
2667                };
2668        }
2669
2670        sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2671        return 0;
2672}
2673
2674/**
2675 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2676 * @sdev:       scsi device to cancel commands
2677 * @type:       type of error recovery being performed
2678 *
2679 * This sends a cancel to the VIOS for the specified device. This does
2680 * NOT send any abort to the actual device. That must be done separately.
2681 *
2682 * Returns:
2683 *      0 on success / other on failure
2684 **/
2685static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2686{
2687        struct ibmvfc_host *vhost = shost_priv(sdev->host);
2688
2689        if (vhost->mq_enabled && vhost->using_channels)
2690                return ibmvfc_cancel_all_mq(sdev, type);
2691        else
2692                return ibmvfc_cancel_all_sq(sdev, type);
2693}
2694
2695/**
2696 * ibmvfc_match_key - Match function for specified cancel key
2697 * @evt:        ibmvfc event struct
2698 * @key:        cancel key to match
2699 *
2700 * Returns:
2701 *      1 if event matches key / 0 if event does not match key
2702 **/
2703static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2704{
2705        unsigned long cancel_key = (unsigned long)key;
2706
2707        if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2708            be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2709                return 1;
2710        return 0;
2711}
2712
2713/**
2714 * ibmvfc_match_evt - Match function for specified event
2715 * @evt:        ibmvfc event struct
2716 * @match:      event to match
2717 *
2718 * Returns:
2719 *      1 if event matches key / 0 if event does not match key
2720 **/
2721static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2722{
2723        if (evt == match)
2724                return 1;
2725        return 0;
2726}
2727
2728/**
2729 * ibmvfc_abort_task_set - Abort outstanding commands to the device
2730 * @sdev:       scsi device to abort commands
2731 *
2732 * This sends an Abort Task Set to the VIOS for the specified device. This does
2733 * NOT send any cancel to the VIOS. That must be done separately.
2734 *
2735 * Returns:
2736 *      0 on success / other on failure
2737 **/
2738static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2739{
2740        struct ibmvfc_host *vhost = shost_priv(sdev->host);
2741        struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2742        struct ibmvfc_cmd *tmf;
2743        struct ibmvfc_event *evt, *found_evt;
2744        union ibmvfc_iu rsp_iu;
2745        struct ibmvfc_fcp_cmd_iu *iu;
2746        struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2747        int rc, rsp_rc = -EBUSY;
2748        unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2749        int rsp_code = 0;
2750
2751        found_evt = NULL;
2752        spin_lock_irqsave(vhost->host->host_lock, flags);
2753        spin_lock(&vhost->crq.l_lock);
2754        list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2755                if (evt->cmnd && evt->cmnd->device == sdev) {
2756                        found_evt = evt;
2757                        break;
2758                }
2759        }
2760        spin_unlock(&vhost->crq.l_lock);
2761
2762        if (!found_evt) {
2763                if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2764                        sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2765                spin_unlock_irqrestore(vhost->host->host_lock, flags);
2766                return 0;
2767        }
2768
2769        if (vhost->state == IBMVFC_ACTIVE) {
2770                evt = ibmvfc_get_event(&vhost->crq);
2771                ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2772                tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2773                iu = ibmvfc_get_fcp_iu(vhost, tmf);
2774
2775                if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2776                        tmf->target_wwpn = cpu_to_be64(rport->port_name);
2777                iu->tmf_flags = IBMVFC_ABORT_TASK_SET;
2778                tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2779                evt->sync_iu = &rsp_iu;
2780
2781                tmf->correlation = cpu_to_be64((u64)evt);
2782
2783                init_completion(&evt->comp);
2784                rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2785        }
2786
2787        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2788
2789        if (rsp_rc != 0) {
2790                sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2791                return -EIO;
2792        }
2793
2794        sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2795        timeout = wait_for_completion_timeout(&evt->comp, timeout);
2796
2797        if (!timeout) {
2798                rc = ibmvfc_cancel_all(sdev, 0);
2799                if (!rc) {
2800                        rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2801                        if (rc == SUCCESS)
2802                                rc = 0;
2803                }
2804
2805                if (rc) {
2806                        sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2807                        ibmvfc_reset_host(vhost);
2808                        rsp_rc = -EIO;
2809                        rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2810
2811                        if (rc == SUCCESS)
2812                                rsp_rc = 0;
2813
2814                        rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2815                        if (rc != SUCCESS) {
2816                                spin_lock_irqsave(vhost->host->host_lock, flags);
2817                                ibmvfc_hard_reset_host(vhost);
2818                                spin_unlock_irqrestore(vhost->host->host_lock, flags);
2819                                rsp_rc = 0;
2820                        }
2821
2822                        goto out;
2823                }
2824        }
2825
2826        if (rsp_iu.cmd.status)
2827                rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2828
2829        if (rsp_code) {
2830                if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2831                        rsp_code = fc_rsp->data.info.rsp_code;
2832
2833                sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2834                            "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2835                            ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2836                            be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2837                            fc_rsp->scsi_status);
2838                rsp_rc = -EIO;
2839        } else
2840                sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2841
2842out:
2843        spin_lock_irqsave(vhost->host->host_lock, flags);
2844        ibmvfc_free_event(evt);
2845        spin_unlock_irqrestore(vhost->host->host_lock, flags);
2846        return rsp_rc;
2847}
2848
2849/**
2850 * ibmvfc_eh_abort_handler - Abort a command
2851 * @cmd:        scsi command to abort
2852 *
2853 * Returns:
2854 *      SUCCESS / FAST_IO_FAIL / FAILED
2855 **/
2856static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2857{
2858        struct scsi_device *sdev = cmd->device;
2859        struct ibmvfc_host *vhost = shost_priv(sdev->host);
2860        int cancel_rc, block_rc;
2861        int rc = FAILED;
2862
2863        ENTER;
2864        block_rc = fc_block_scsi_eh(cmd);
2865        ibmvfc_wait_while_resetting(vhost);
2866        if (block_rc != FAST_IO_FAIL) {
2867                cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2868                ibmvfc_abort_task_set(sdev);
2869        } else
2870                cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2871
2872        if (!cancel_rc)
2873                rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2874
2875        if (block_rc == FAST_IO_FAIL && rc != FAILED)
2876                rc = FAST_IO_FAIL;
2877
2878        LEAVE;
2879        return rc;
2880}
2881
2882/**
2883 * ibmvfc_eh_device_reset_handler - Reset a single LUN
2884 * @cmd:        scsi command struct
2885 *
2886 * Returns:
2887 *      SUCCESS / FAST_IO_FAIL / FAILED
2888 **/
2889static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2890{
2891        struct scsi_device *sdev = cmd->device;
2892        struct ibmvfc_host *vhost = shost_priv(sdev->host);
2893        int cancel_rc, block_rc, reset_rc = 0;
2894        int rc = FAILED;
2895
2896        ENTER;
2897        block_rc = fc_block_scsi_eh(cmd);
2898        ibmvfc_wait_while_resetting(vhost);
2899        if (block_rc != FAST_IO_FAIL) {
2900                cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2901                reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2902        } else
2903                cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2904
2905        if (!cancel_rc && !reset_rc)
2906                rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2907
2908        if (block_rc == FAST_IO_FAIL && rc != FAILED)
2909                rc = FAST_IO_FAIL;
2910
2911        LEAVE;
2912        return rc;
2913}
2914
2915/**
2916 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2917 * @sdev:       scsi device struct
2918 * @data:       return code
2919 *
2920 **/
2921static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2922{
2923        unsigned long *rc = data;
2924        *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2925}
2926
2927/**
2928 * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2929 * @sdev:       scsi device struct
2930 * @data:       return code
2931 *
2932 **/
2933static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2934{
2935        unsigned long *rc = data;
2936        *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2937}
2938
2939/**
2940 * ibmvfc_eh_target_reset_handler - Reset the target
2941 * @cmd:        scsi command struct
2942 *
2943 * Returns:
2944 *      SUCCESS / FAST_IO_FAIL / FAILED
2945 **/
2946static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2947{
2948        struct scsi_device *sdev = cmd->device;
2949        struct ibmvfc_host *vhost = shost_priv(sdev->host);
2950        struct scsi_target *starget = scsi_target(sdev);
2951        int block_rc;
2952        int reset_rc = 0;
2953        int rc = FAILED;
2954        unsigned long cancel_rc = 0;
2955
2956        ENTER;
2957        block_rc = fc_block_scsi_eh(cmd);
2958        ibmvfc_wait_while_resetting(vhost);
2959        if (block_rc != FAST_IO_FAIL) {
2960                starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2961                reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2962        } else
2963                starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2964
2965        if (!cancel_rc && !reset_rc)
2966                rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2967
2968        if (block_rc == FAST_IO_FAIL && rc != FAILED)
2969                rc = FAST_IO_FAIL;
2970
2971        LEAVE;
2972        return rc;
2973}
2974
2975/**
2976 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2977 * @cmd:        struct scsi_cmnd having problems
2978 *
2979 **/
2980static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2981{
2982        int rc;
2983        struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2984
2985        dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2986        rc = ibmvfc_issue_fc_host_lip(vhost->host);
2987
2988        return rc ? FAILED : SUCCESS;
2989}
2990
2991/**
2992 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2993 * @rport:              rport struct
2994 *
2995 * Return value:
2996 *      none
2997 **/
2998static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2999{
3000        struct Scsi_Host *shost = rport_to_shost(rport);
3001        struct ibmvfc_host *vhost = shost_priv(shost);
3002        struct fc_rport *dev_rport;
3003        struct scsi_device *sdev;
3004        struct ibmvfc_target *tgt;
3005        unsigned long rc, flags;
3006        unsigned int found;
3007
3008        ENTER;
3009        shost_for_each_device(sdev, shost) {
3010                dev_rport = starget_to_rport(scsi_target(sdev));
3011                if (dev_rport != rport)
3012                        continue;
3013                ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3014        }
3015
3016        rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
3017
3018        if (rc == FAILED)
3019                ibmvfc_issue_fc_host_lip(shost);
3020
3021        spin_lock_irqsave(shost->host_lock, flags);
3022        found = 0;
3023        list_for_each_entry(tgt, &vhost->targets, queue) {
3024                if (tgt->scsi_id == rport->port_id) {
3025                        found++;
3026                        break;
3027                }
3028        }
3029
3030        if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
3031                /*
3032                 * If we get here, that means we previously attempted to send
3033                 * an implicit logout to the target but it failed, most likely
3034                 * due to I/O being pending, so we need to send it again
3035                 */
3036                ibmvfc_del_tgt(tgt);
3037                ibmvfc_reinit_host(vhost);
3038        }
3039
3040        spin_unlock_irqrestore(shost->host_lock, flags);
3041        LEAVE;
3042}
3043
3044static const struct ibmvfc_async_desc ae_desc [] = {
3045        { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3046        { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3047        { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3048        { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3049        { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3050        { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
3051        { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
3052        { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
3053        { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
3054        { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
3055        { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
3056        { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
3057        { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
3058};
3059
3060static const struct ibmvfc_async_desc unknown_ae = {
3061        "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
3062};
3063
3064/**
3065 * ibmvfc_get_ae_desc - Get text description for async event
3066 * @ae: async event
3067 *
3068 **/
3069static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
3070{
3071        int i;
3072
3073        for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
3074                if (ae_desc[i].ae == ae)
3075                        return &ae_desc[i];
3076
3077        return &unknown_ae;
3078}
3079
3080static const struct {
3081        enum ibmvfc_ae_link_state state;
3082        const char *desc;
3083} link_desc [] = {
3084        { IBMVFC_AE_LS_LINK_UP,         " link up" },
3085        { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
3086        { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
3087        { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
3088};
3089
3090/**
3091 * ibmvfc_get_link_state - Get text description for link state
3092 * @state:      link state
3093 *
3094 **/
3095static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
3096{
3097        int i;
3098
3099        for (i = 0; i < ARRAY_SIZE(link_desc); i++)
3100                if (link_desc[i].state == state)
3101                        return link_desc[i].desc;
3102
3103        return "";
3104}
3105
3106/**
3107 * ibmvfc_handle_async - Handle an async event from the adapter
3108 * @crq:        crq to process
3109 * @vhost:      ibmvfc host struct
3110 *
3111 **/
3112static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
3113                                struct ibmvfc_host *vhost)
3114{
3115        const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
3116        struct ibmvfc_target *tgt;
3117
3118        ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
3119                   " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
3120                   be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
3121                   ibmvfc_get_link_state(crq->link_state));
3122
3123        switch (be64_to_cpu(crq->event)) {
3124        case IBMVFC_AE_RESUME:
3125                switch (crq->link_state) {
3126                case IBMVFC_AE_LS_LINK_DOWN:
3127                        ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3128                        break;
3129                case IBMVFC_AE_LS_LINK_DEAD:
3130                        ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3131                        break;
3132                case IBMVFC_AE_LS_LINK_UP:
3133                case IBMVFC_AE_LS_LINK_BOUNCED:
3134                default:
3135                        vhost->events_to_log |= IBMVFC_AE_LINKUP;
3136                        vhost->delay_init = 1;
3137                        __ibmvfc_reset_host(vhost);
3138                        break;
3139                }
3140
3141                break;
3142        case IBMVFC_AE_LINK_UP:
3143                vhost->events_to_log |= IBMVFC_AE_LINKUP;
3144                vhost->delay_init = 1;
3145                __ibmvfc_reset_host(vhost);
3146                break;
3147        case IBMVFC_AE_SCN_FABRIC:
3148        case IBMVFC_AE_SCN_DOMAIN:
3149                vhost->events_to_log |= IBMVFC_AE_RSCN;
3150                if (vhost->state < IBMVFC_HALTED) {
3151                        vhost->delay_init = 1;
3152                        __ibmvfc_reset_host(vhost);
3153                }
3154                break;
3155        case IBMVFC_AE_SCN_NPORT:
3156        case IBMVFC_AE_SCN_GROUP:
3157                vhost->events_to_log |= IBMVFC_AE_RSCN;
3158                ibmvfc_reinit_host(vhost);
3159                break;
3160        case IBMVFC_AE_ELS_LOGO:
3161        case IBMVFC_AE_ELS_PRLO:
3162        case IBMVFC_AE_ELS_PLOGI:
3163                list_for_each_entry(tgt, &vhost->targets, queue) {
3164                        if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
3165                                break;
3166                        if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
3167                                continue;
3168                        if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
3169                                continue;
3170                        if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
3171                                continue;
3172                        if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
3173                                tgt->logo_rcvd = 1;
3174                        if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
3175                                ibmvfc_del_tgt(tgt);
3176                                ibmvfc_reinit_host(vhost);
3177                        }
3178                }
3179                break;
3180        case IBMVFC_AE_LINK_DOWN:
3181        case IBMVFC_AE_ADAPTER_FAILED:
3182                ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3183                break;
3184        case IBMVFC_AE_LINK_DEAD:
3185                ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3186                break;
3187        case IBMVFC_AE_HALT:
3188                ibmvfc_link_down(vhost, IBMVFC_HALTED);
3189                break;
3190        default:
3191                dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
3192                break;
3193        }
3194}
3195
3196/**
3197 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
3198 * @crq:        Command/Response queue
3199 * @vhost:      ibmvfc host struct
3200 * @evt_doneq:  Event done queue
3201 *
3202**/
3203static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3204                              struct list_head *evt_doneq)
3205{
3206        long rc;
3207        struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3208
3209        switch (crq->valid) {
3210        case IBMVFC_CRQ_INIT_RSP:
3211                switch (crq->format) {
3212                case IBMVFC_CRQ_INIT:
3213                        dev_info(vhost->dev, "Partner initialized\n");
3214                        /* Send back a response */
3215                        rc = ibmvfc_send_crq_init_complete(vhost);
3216                        if (rc == 0)
3217                                ibmvfc_init_host(vhost);
3218                        else
3219                                dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
3220                        break;
3221                case IBMVFC_CRQ_INIT_COMPLETE:
3222                        dev_info(vhost->dev, "Partner initialization complete\n");
3223                        ibmvfc_init_host(vhost);
3224                        break;
3225                default:
3226                        dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
3227                }
3228                return;
3229        case IBMVFC_CRQ_XPORT_EVENT:
3230                vhost->state = IBMVFC_NO_CRQ;
3231                vhost->logged_in = 0;
3232                ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3233                if (crq->format == IBMVFC_PARTITION_MIGRATED) {
3234                        /* We need to re-setup the interpartition connection */
3235                        dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
3236                        vhost->client_migrated = 1;
3237                        ibmvfc_purge_requests(vhost, DID_REQUEUE);
3238                        ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3239                        ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
3240                } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
3241                        dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
3242                        ibmvfc_purge_requests(vhost, DID_ERROR);
3243                        ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3244                        ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
3245                } else {
3246                        dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
3247                }
3248                return;
3249        case IBMVFC_CRQ_CMD_RSP:
3250                break;
3251        default:
3252                dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
3253                return;
3254        }
3255
3256        if (crq->format == IBMVFC_ASYNC_EVENT)
3257                return;
3258
3259        /* The only kind of payload CRQs we should get are responses to
3260         * things we send. Make sure this response is to something we
3261         * actually sent
3262         */
3263        if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) {
3264                dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3265                        crq->ioba);
3266                return;
3267        }
3268
3269        if (unlikely(atomic_dec_if_positive(&evt->active))) {
3270                dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3271                        crq->ioba);
3272                return;
3273        }
3274
3275        spin_lock(&evt->queue->l_lock);
3276        list_move_tail(&evt->queue_list, evt_doneq);
3277        spin_unlock(&evt->queue->l_lock);
3278}
3279
3280/**
3281 * ibmvfc_scan_finished - Check if the device scan is done.
3282 * @shost:      scsi host struct
3283 * @time:       current elapsed time
3284 *
3285 * Returns:
3286 *      0 if scan is not done / 1 if scan is done
3287 **/
3288static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
3289{
3290        unsigned long flags;
3291        struct ibmvfc_host *vhost = shost_priv(shost);
3292        int done = 0;
3293
3294        spin_lock_irqsave(shost->host_lock, flags);
3295        if (time >= (init_timeout * HZ)) {
3296                dev_info(vhost->dev, "Scan taking longer than %d seconds, "
3297                         "continuing initialization\n", init_timeout);
3298                done = 1;
3299        }
3300
3301        if (vhost->scan_complete)
3302                done = 1;
3303        spin_unlock_irqrestore(shost->host_lock, flags);
3304        return done;
3305}
3306
3307/**
3308 * ibmvfc_slave_alloc - Setup the device's task set value
3309 * @sdev:       struct scsi_device device to configure
3310 *
3311 * Set the device's task set value so that error handling works as
3312 * expected.
3313 *
3314 * Returns:
3315 *      0 on success / -ENXIO if device does not exist
3316 **/
3317static int ibmvfc_slave_alloc(struct scsi_device *sdev)
3318{
3319        struct Scsi_Host *shost = sdev->host;
3320        struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
3321        struct ibmvfc_host *vhost = shost_priv(shost);
3322        unsigned long flags = 0;
3323
3324        if (!rport || fc_remote_port_chkready(rport))
3325                return -ENXIO;
3326
3327        spin_lock_irqsave(shost->host_lock, flags);
3328        sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
3329        spin_unlock_irqrestore(shost->host_lock, flags);
3330        return 0;
3331}
3332
3333/**
3334 * ibmvfc_target_alloc - Setup the target's task set value
3335 * @starget:    struct scsi_target
3336 *
3337 * Set the target's task set value so that error handling works as
3338 * expected.
3339 *
3340 * Returns:
3341 *      0 on success / -ENXIO if device does not exist
3342 **/
3343static int ibmvfc_target_alloc(struct scsi_target *starget)
3344{
3345        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3346        struct ibmvfc_host *vhost = shost_priv(shost);
3347        unsigned long flags = 0;
3348
3349        spin_lock_irqsave(shost->host_lock, flags);
3350        starget->hostdata = (void *)(unsigned long)vhost->task_set++;
3351        spin_unlock_irqrestore(shost->host_lock, flags);
3352        return 0;
3353}
3354
3355/**
3356 * ibmvfc_slave_configure - Configure the device
3357 * @sdev:       struct scsi_device device to configure
3358 *
3359 * Enable allow_restart for a device if it is a disk. Adjust the
3360 * queue_depth here also.
3361 *
3362 * Returns:
3363 *      0
3364 **/
3365static int ibmvfc_slave_configure(struct scsi_device *sdev)
3366{
3367        struct Scsi_Host *shost = sdev->host;
3368        unsigned long flags = 0;
3369
3370        spin_lock_irqsave(shost->host_lock, flags);
3371        if (sdev->type == TYPE_DISK) {
3372                sdev->allow_restart = 1;
3373                blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
3374        }
3375        spin_unlock_irqrestore(shost->host_lock, flags);
3376        return 0;
3377}
3378
3379/**
3380 * ibmvfc_change_queue_depth - Change the device's queue depth
3381 * @sdev:       scsi device struct
3382 * @qdepth:     depth to set
3383 *
3384 * Return value:
3385 *      actual depth set
3386 **/
3387static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
3388{
3389        if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
3390                qdepth = IBMVFC_MAX_CMDS_PER_LUN;
3391
3392        return scsi_change_queue_depth(sdev, qdepth);
3393}
3394
3395static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
3396                                                 struct device_attribute *attr, char *buf)
3397{
3398        struct Scsi_Host *shost = class_to_shost(dev);
3399        struct ibmvfc_host *vhost = shost_priv(shost);
3400
3401        return snprintf(buf, PAGE_SIZE, "%s\n",
3402                        vhost->login_buf->resp.partition_name);
3403}
3404
3405static ssize_t ibmvfc_show_host_device_name(struct device *dev,
3406                                            struct device_attribute *attr, char *buf)
3407{
3408        struct Scsi_Host *shost = class_to_shost(dev);
3409        struct ibmvfc_host *vhost = shost_priv(shost);
3410
3411        return snprintf(buf, PAGE_SIZE, "%s\n",
3412                        vhost->login_buf->resp.device_name);
3413}
3414
3415static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
3416                                         struct device_attribute *attr, char *buf)
3417{
3418        struct Scsi_Host *shost = class_to_shost(dev);
3419        struct ibmvfc_host *vhost = shost_priv(shost);
3420
3421        return snprintf(buf, PAGE_SIZE, "%s\n",
3422                        vhost->login_buf->resp.port_loc_code);
3423}
3424
3425static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
3426                                         struct device_attribute *attr, char *buf)
3427{
3428        struct Scsi_Host *shost = class_to_shost(dev);
3429        struct ibmvfc_host *vhost = shost_priv(shost);
3430
3431        return snprintf(buf, PAGE_SIZE, "%s\n",
3432                        vhost->login_buf->resp.drc_name);
3433}
3434
3435static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
3436                                             struct device_attribute *attr, char *buf)
3437{
3438        struct Scsi_Host *shost = class_to_shost(dev);
3439        struct ibmvfc_host *vhost = shost_priv(shost);
3440        return snprintf(buf, PAGE_SIZE, "%d\n", be32_to_cpu(vhost->login_buf->resp.version));
3441}
3442
3443static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3444                                             struct device_attribute *attr, char *buf)
3445{
3446        struct Scsi_Host *shost = class_to_shost(dev);
3447        struct ibmvfc_host *vhost = shost_priv(shost);
3448        return snprintf(buf, PAGE_SIZE, "%llx\n", be64_to_cpu(vhost->login_buf->resp.capabilities));
3449}
3450
3451/**
3452 * ibmvfc_show_log_level - Show the adapter's error logging level
3453 * @dev:        class device struct
3454 * @attr:       unused
3455 * @buf:        buffer
3456 *
3457 * Return value:
3458 *      number of bytes printed to buffer
3459 **/
3460static ssize_t ibmvfc_show_log_level(struct device *dev,
3461                                     struct device_attribute *attr, char *buf)
3462{
3463        struct Scsi_Host *shost = class_to_shost(dev);
3464        struct ibmvfc_host *vhost = shost_priv(shost);
3465        unsigned long flags = 0;
3466        int len;
3467
3468        spin_lock_irqsave(shost->host_lock, flags);
3469        len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
3470        spin_unlock_irqrestore(shost->host_lock, flags);
3471        return len;
3472}
3473
3474/**
3475 * ibmvfc_store_log_level - Change the adapter's error logging level
3476 * @dev:        class device struct
3477 * @attr:       unused
3478 * @buf:        buffer
3479 * @count:      buffer size
3480 *
3481 * Return value:
3482 *      number of bytes printed to buffer
3483 **/
3484static ssize_t ibmvfc_store_log_level(struct device *dev,
3485                                      struct device_attribute *attr,
3486                                      const char *buf, size_t count)
3487{
3488        struct Scsi_Host *shost = class_to_shost(dev);
3489        struct ibmvfc_host *vhost = shost_priv(shost);
3490        unsigned long flags = 0;
3491
3492        spin_lock_irqsave(shost->host_lock, flags);
3493        vhost->log_level = simple_strtoul(buf, NULL, 10);
3494        spin_unlock_irqrestore(shost->host_lock, flags);
3495        return strlen(buf);
3496}
3497
3498static ssize_t ibmvfc_show_scsi_channels(struct device *dev,
3499                                         struct device_attribute *attr, char *buf)
3500{
3501        struct Scsi_Host *shost = class_to_shost(dev);
3502        struct ibmvfc_host *vhost = shost_priv(shost);
3503        unsigned long flags = 0;
3504        int len;
3505
3506        spin_lock_irqsave(shost->host_lock, flags);
3507        len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->client_scsi_channels);
3508        spin_unlock_irqrestore(shost->host_lock, flags);
3509        return len;
3510}
3511
3512static ssize_t ibmvfc_store_scsi_channels(struct device *dev,
3513                                         struct device_attribute *attr,
3514                                         const char *buf, size_t count)
3515{
3516        struct Scsi_Host *shost = class_to_shost(dev);
3517        struct ibmvfc_host *vhost = shost_priv(shost);
3518        unsigned long flags = 0;
3519        unsigned int channels;
3520
3521        spin_lock_irqsave(shost->host_lock, flags);
3522        channels = simple_strtoul(buf, NULL, 10);
3523        vhost->client_scsi_channels = min(channels, nr_scsi_hw_queues);
3524        ibmvfc_hard_reset_host(vhost);
3525        spin_unlock_irqrestore(shost->host_lock, flags);
3526        return strlen(buf);
3527}
3528
3529static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3530static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3531static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3532static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3533static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3534static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3535static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3536                   ibmvfc_show_log_level, ibmvfc_store_log_level);
3537static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
3538                   ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels);
3539
3540#ifdef CONFIG_SCSI_IBMVFC_TRACE
3541/**
3542 * ibmvfc_read_trace - Dump the adapter trace
3543 * @filp:               open sysfs file
3544 * @kobj:               kobject struct
3545 * @bin_attr:   bin_attribute struct
3546 * @buf:                buffer
3547 * @off:                offset
3548 * @count:              buffer size
3549 *
3550 * Return value:
3551 *      number of bytes printed to buffer
3552 **/
3553static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3554                                 struct bin_attribute *bin_attr,
3555                                 char *buf, loff_t off, size_t count)
3556{
3557        struct device *dev = kobj_to_dev(kobj);
3558        struct Scsi_Host *shost = class_to_shost(dev);
3559        struct ibmvfc_host *vhost = shost_priv(shost);
3560        unsigned long flags = 0;
3561        int size = IBMVFC_TRACE_SIZE;
3562        char *src = (char *)vhost->trace;
3563
3564        if (off > size)
3565                return 0;
3566        if (off + count > size) {
3567                size -= off;
3568                count = size;
3569        }
3570
3571        spin_lock_irqsave(shost->host_lock, flags);
3572        memcpy(buf, &src[off], count);
3573        spin_unlock_irqrestore(shost->host_lock, flags);
3574        return count;
3575}
3576
3577static struct bin_attribute ibmvfc_trace_attr = {
3578        .attr = {
3579                .name = "trace",
3580                .mode = S_IRUGO,
3581        },
3582        .size = 0,
3583        .read = ibmvfc_read_trace,
3584};
3585#endif
3586
3587static struct device_attribute *ibmvfc_attrs[] = {
3588        &dev_attr_partition_name,
3589        &dev_attr_device_name,
3590        &dev_attr_port_loc_code,
3591        &dev_attr_drc_name,
3592        &dev_attr_npiv_version,
3593        &dev_attr_capabilities,
3594        &dev_attr_log_level,
3595        &dev_attr_nr_scsi_channels,
3596        NULL
3597};
3598
3599static struct scsi_host_template driver_template = {
3600        .module = THIS_MODULE,
3601        .name = "IBM POWER Virtual FC Adapter",
3602        .proc_name = IBMVFC_NAME,
3603        .queuecommand = ibmvfc_queuecommand,
3604        .eh_timed_out = fc_eh_timed_out,
3605        .eh_abort_handler = ibmvfc_eh_abort_handler,
3606        .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3607        .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3608        .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3609        .slave_alloc = ibmvfc_slave_alloc,
3610        .slave_configure = ibmvfc_slave_configure,
3611        .target_alloc = ibmvfc_target_alloc,
3612        .scan_finished = ibmvfc_scan_finished,
3613        .change_queue_depth = ibmvfc_change_queue_depth,
3614        .cmd_per_lun = 16,
3615        .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3616        .this_id = -1,
3617        .sg_tablesize = SG_ALL,
3618        .max_sectors = IBMVFC_MAX_SECTORS,
3619        .shost_attrs = ibmvfc_attrs,
3620        .track_queue_depth = 1,
3621        .host_tagset = 1,
3622};
3623
3624/**
3625 * ibmvfc_next_async_crq - Returns the next entry in async queue
3626 * @vhost:      ibmvfc host struct
3627 *
3628 * Returns:
3629 *      Pointer to next entry in queue / NULL if empty
3630 **/
3631static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3632{
3633        struct ibmvfc_queue *async_crq = &vhost->async_crq;
3634        struct ibmvfc_async_crq *crq;
3635
3636        crq = &async_crq->msgs.async[async_crq->cur];
3637        if (crq->valid & 0x80) {
3638                if (++async_crq->cur == async_crq->size)
3639                        async_crq->cur = 0;
3640                rmb();
3641        } else
3642                crq = NULL;
3643
3644        return crq;
3645}
3646
3647/**
3648 * ibmvfc_next_crq - Returns the next entry in message queue
3649 * @vhost:      ibmvfc host struct
3650 *
3651 * Returns:
3652 *      Pointer to next entry in queue / NULL if empty
3653 **/
3654static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3655{
3656        struct ibmvfc_queue *queue = &vhost->crq;
3657        struct ibmvfc_crq *crq;
3658
3659        crq = &queue->msgs.crq[queue->cur];
3660        if (crq->valid & 0x80) {
3661                if (++queue->cur == queue->size)
3662                        queue->cur = 0;
3663                rmb();
3664        } else
3665                crq = NULL;
3666
3667        return crq;
3668}
3669
3670/**
3671 * ibmvfc_interrupt - Interrupt handler
3672 * @irq:                number of irq to handle, not used
3673 * @dev_instance: ibmvfc_host that received interrupt
3674 *
3675 * Returns:
3676 *      IRQ_HANDLED
3677 **/
3678static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3679{
3680        struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3681        unsigned long flags;
3682
3683        spin_lock_irqsave(vhost->host->host_lock, flags);
3684        vio_disable_interrupts(to_vio_dev(vhost->dev));
3685        tasklet_schedule(&vhost->tasklet);
3686        spin_unlock_irqrestore(vhost->host->host_lock, flags);
3687        return IRQ_HANDLED;
3688}
3689
3690/**
3691 * ibmvfc_tasklet - Interrupt handler tasklet
3692 * @data:               ibmvfc host struct
3693 *
3694 * Returns:
3695 *      Nothing
3696 **/
3697static void ibmvfc_tasklet(void *data)
3698{
3699        struct ibmvfc_host *vhost = data;
3700        struct vio_dev *vdev = to_vio_dev(vhost->dev);
3701        struct ibmvfc_crq *crq;
3702        struct ibmvfc_async_crq *async;
3703        struct ibmvfc_event *evt, *temp;
3704        unsigned long flags;
3705        int done = 0;
3706        LIST_HEAD(evt_doneq);
3707
3708        spin_lock_irqsave(vhost->host->host_lock, flags);
3709        spin_lock(vhost->crq.q_lock);
3710        while (!done) {
3711                /* Pull all the valid messages off the async CRQ */
3712                while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3713                        ibmvfc_handle_async(async, vhost);
3714                        async->valid = 0;
3715                        wmb();
3716                }
3717
3718                /* Pull all the valid messages off the CRQ */
3719                while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3720                        ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3721                        crq->valid = 0;
3722                        wmb();
3723                }
3724
3725                vio_enable_interrupts(vdev);
3726                if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3727                        vio_disable_interrupts(vdev);
3728                        ibmvfc_handle_async(async, vhost);
3729                        async->valid = 0;
3730                        wmb();
3731                } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3732                        vio_disable_interrupts(vdev);
3733                        ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3734                        crq->valid = 0;
3735                        wmb();
3736                } else
3737                        done = 1;
3738        }
3739
3740        spin_unlock(vhost->crq.q_lock);
3741        spin_unlock_irqrestore(vhost->host->host_lock, flags);
3742
3743        list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3744                del_timer(&evt->timer);
3745                list_del(&evt->queue_list);
3746                ibmvfc_trc_end(evt);
3747                evt->done(evt);
3748        }
3749}
3750
3751static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
3752{
3753        struct device *dev = scrq->vhost->dev;
3754        struct vio_dev *vdev = to_vio_dev(dev);
3755        unsigned long rc;
3756        int irq_action = H_ENABLE_VIO_INTERRUPT;
3757
3758        if (!enable)
3759                irq_action = H_DISABLE_VIO_INTERRUPT;
3760
3761        rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
3762                                scrq->hw_irq, 0, 0);
3763
3764        if (rc)
3765                dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
3766                        enable ? "enable" : "disable", scrq->hwq_id, rc);
3767
3768        return rc;
3769}
3770
3771static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3772                               struct list_head *evt_doneq)
3773{
3774        struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3775
3776        switch (crq->valid) {
3777        case IBMVFC_CRQ_CMD_RSP:
3778                break;
3779        case IBMVFC_CRQ_XPORT_EVENT:
3780                return;
3781        default:
3782                dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
3783                return;
3784        }
3785
3786        /* The only kind of payload CRQs we should get are responses to
3787         * things we send. Make sure this response is to something we
3788         * actually sent
3789         */
3790        if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
3791                dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3792                        crq->ioba);
3793                return;
3794        }
3795
3796        if (unlikely(atomic_dec_if_positive(&evt->active))) {
3797                dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3798                        crq->ioba);
3799                return;
3800        }
3801
3802        spin_lock(&evt->queue->l_lock);
3803        list_move_tail(&evt->queue_list, evt_doneq);
3804        spin_unlock(&evt->queue->l_lock);
3805}
3806
3807static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
3808{
3809        struct ibmvfc_crq *crq;
3810
3811        crq = &scrq->msgs.scrq[scrq->cur].crq;
3812        if (crq->valid & 0x80) {
3813                if (++scrq->cur == scrq->size)
3814                        scrq->cur = 0;
3815                rmb();
3816        } else
3817                crq = NULL;
3818
3819        return crq;
3820}
3821
3822static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
3823{
3824        struct ibmvfc_crq *crq;
3825        struct ibmvfc_event *evt, *temp;
3826        unsigned long flags;
3827        int done = 0;
3828        LIST_HEAD(evt_doneq);
3829
3830        spin_lock_irqsave(scrq->q_lock, flags);
3831        while (!done) {
3832                while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3833                        ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3834                        crq->valid = 0;
3835                        wmb();
3836                }
3837
3838                ibmvfc_toggle_scrq_irq(scrq, 1);
3839                if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3840                        ibmvfc_toggle_scrq_irq(scrq, 0);
3841                        ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3842                        crq->valid = 0;
3843                        wmb();
3844                } else
3845                        done = 1;
3846        }
3847        spin_unlock_irqrestore(scrq->q_lock, flags);
3848
3849        list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3850                del_timer(&evt->timer);
3851                list_del(&evt->queue_list);
3852                ibmvfc_trc_end(evt);
3853                evt->done(evt);
3854        }
3855}
3856
3857static irqreturn_t ibmvfc_interrupt_scsi(int irq, void *scrq_instance)
3858{
3859        struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance;
3860
3861        ibmvfc_toggle_scrq_irq(scrq, 0);
3862        ibmvfc_drain_sub_crq(scrq);
3863
3864        return IRQ_HANDLED;
3865}
3866
3867/**
3868 * ibmvfc_init_tgt - Set the next init job step for the target
3869 * @tgt:                ibmvfc target struct
3870 * @job_step:   job step to perform
3871 *
3872 **/
3873static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3874                            void (*job_step) (struct ibmvfc_target *))
3875{
3876        if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT))
3877                tgt->job_step = job_step;
3878        wake_up(&tgt->vhost->work_wait_q);
3879}
3880
3881/**
3882 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3883 * @tgt:                ibmvfc target struct
3884 * @job_step:   initialization job step
3885 *
3886 * Returns: 1 if step will be retried / 0 if not
3887 *
3888 **/
3889static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3890                                  void (*job_step) (struct ibmvfc_target *))
3891{
3892        if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3893                ibmvfc_del_tgt(tgt);
3894                wake_up(&tgt->vhost->work_wait_q);
3895                return 0;
3896        } else
3897                ibmvfc_init_tgt(tgt, job_step);
3898        return 1;
3899}
3900
3901/* Defined in FC-LS */
3902static const struct {
3903        int code;
3904        int retry;
3905        int logged_in;
3906} prli_rsp [] = {
3907        { 0, 1, 0 },
3908        { 1, 0, 1 },
3909        { 2, 1, 0 },
3910        { 3, 1, 0 },
3911        { 4, 0, 0 },
3912        { 5, 0, 0 },
3913        { 6, 0, 1 },
3914        { 7, 0, 0 },
3915        { 8, 1, 0 },
3916};
3917
3918/**
3919 * ibmvfc_get_prli_rsp - Find PRLI response index
3920 * @flags:      PRLI response flags
3921 *
3922 **/
3923static int ibmvfc_get_prli_rsp(u16 flags)
3924{
3925        int i;
3926        int code = (flags & 0x0f00) >> 8;
3927
3928        for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3929                if (prli_rsp[i].code == code)
3930                        return i;
3931
3932        return 0;
3933}
3934
3935/**
3936 * ibmvfc_tgt_prli_done - Completion handler for Process Login
3937 * @evt:        ibmvfc event struct
3938 *
3939 **/
3940static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3941{
3942        struct ibmvfc_target *tgt = evt->tgt;
3943        struct ibmvfc_host *vhost = evt->vhost;
3944        struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3945        struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3946        u32 status = be16_to_cpu(rsp->common.status);
3947        int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3948
3949        vhost->discovery_threads--;
3950        ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3951        switch (status) {
3952        case IBMVFC_MAD_SUCCESS:
3953                tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3954                        parms->type, parms->flags, parms->service_parms);
3955
3956                if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3957                        index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3958                        if (prli_rsp[index].logged_in) {
3959                                if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3960                                        tgt->need_login = 0;
3961                                        tgt->ids.roles = 0;
3962                                        if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3963                                                tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3964                                        if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3965                                                tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3966                                        tgt->add_rport = 1;
3967                                } else
3968                                        ibmvfc_del_tgt(tgt);
3969                        } else if (prli_rsp[index].retry)
3970                                ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3971                        else
3972                                ibmvfc_del_tgt(tgt);
3973                } else
3974                        ibmvfc_del_tgt(tgt);
3975                break;
3976        case IBMVFC_MAD_DRIVER_FAILED:
3977                break;
3978        case IBMVFC_MAD_CRQ_ERROR:
3979                ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3980                break;
3981        case IBMVFC_MAD_FAILED:
3982        default:
3983                if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3984                     be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3985                        level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3986                else if (tgt->logo_rcvd)
3987                        level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3988                else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3989                        level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3990                else
3991                        ibmvfc_del_tgt(tgt);
3992
3993                tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3994                        ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3995                        be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
3996                break;
3997        }
3998
3999        kref_put(&tgt->kref, ibmvfc_release_tgt);
4000        ibmvfc_free_event(evt);
4001        wake_up(&vhost->work_wait_q);
4002}
4003
4004/**
4005 * ibmvfc_tgt_send_prli - Send a process login
4006 * @tgt:        ibmvfc target struct
4007 *
4008 **/
4009static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
4010{
4011        struct ibmvfc_process_login *prli;
4012        struct ibmvfc_host *vhost = tgt->vhost;
4013        struct ibmvfc_event *evt;
4014
4015        if (vhost->discovery_threads >= disc_threads)
4016                return;
4017
4018        kref_get(&tgt->kref);
4019        evt = ibmvfc_get_event(&vhost->crq);
4020        vhost->discovery_threads++;
4021        ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
4022        evt->tgt = tgt;
4023        prli = &evt->iu.prli;
4024        memset(prli, 0, sizeof(*prli));
4025        if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4026                prli->common.version = cpu_to_be32(2);
4027                prli->target_wwpn = cpu_to_be64(tgt->wwpn);
4028        } else {
4029                prli->common.version = cpu_to_be32(1);
4030        }
4031        prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
4032        prli->common.length = cpu_to_be16(sizeof(*prli));
4033        prli->scsi_id = cpu_to_be64(tgt->scsi_id);
4034
4035        prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
4036        prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
4037        prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
4038        prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
4039
4040        if (cls3_error)
4041                prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
4042
4043        ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4044        if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4045                vhost->discovery_threads--;
4046                ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4047                kref_put(&tgt->kref, ibmvfc_release_tgt);
4048        } else
4049                tgt_dbg(tgt, "Sent process login\n");
4050}
4051
4052/**
4053 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
4054 * @evt:        ibmvfc event struct
4055 *
4056 **/
4057static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
4058{
4059        struct ibmvfc_target *tgt = evt->tgt;
4060        struct ibmvfc_host *vhost = evt->vhost;
4061        struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
4062        u32 status = be16_to_cpu(rsp->common.status);
4063        int level = IBMVFC_DEFAULT_LOG_LEVEL;
4064
4065        vhost->discovery_threads--;
4066        ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4067        switch (status) {
4068        case IBMVFC_MAD_SUCCESS:
4069                tgt_dbg(tgt, "Port Login succeeded\n");
4070                if (tgt->ids.port_name &&
4071                    tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
4072                        vhost->reinit = 1;
4073                        tgt_dbg(tgt, "Port re-init required\n");
4074                        break;
4075                }
4076                tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4077                tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4078                tgt->ids.port_id = tgt->scsi_id;
4079                memcpy(&tgt->service_parms, &rsp->service_parms,
4080                       sizeof(tgt->service_parms));
4081                memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4082                       sizeof(tgt->service_parms_change));
4083                ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4084                break;
4085        case IBMVFC_MAD_DRIVER_FAILED:
4086                break;
4087        case IBMVFC_MAD_CRQ_ERROR:
4088                ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4089                break;
4090        case IBMVFC_MAD_FAILED:
4091        default:
4092                if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4093                        level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4094                else
4095                        ibmvfc_del_tgt(tgt);
4096
4097                tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4098                        ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4099                                             be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4100                        ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4101                        ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
4102                break;
4103        }
4104
4105        kref_put(&tgt->kref, ibmvfc_release_tgt);
4106        ibmvfc_free_event(evt);
4107        wake_up(&vhost->work_wait_q);
4108}
4109
4110/**
4111 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
4112 * @tgt:        ibmvfc target struct
4113 *
4114 **/
4115static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
4116{
4117        struct ibmvfc_port_login *plogi;
4118        struct ibmvfc_host *vhost = tgt->vhost;
4119        struct ibmvfc_event *evt;
4120
4121        if (vhost->discovery_threads >= disc_threads)
4122                return;
4123
4124        kref_get(&tgt->kref);
4125        tgt->logo_rcvd = 0;
4126        evt = ibmvfc_get_event(&vhost->crq);
4127        vhost->discovery_threads++;
4128        ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4129        ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
4130        evt->tgt = tgt;
4131