drivers/scsi/ibmvscsi/ibmvfc.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
ibmvfc_trc_start
ibmvfc_trc_end
ibmvfc_get_err_index
ibmvfc_get_cmd_error
ibmvfc_get_err_result
ibmvfc_retry_cmd
ibmvfc_get_ls_explain
ibmvfc_get_gs_explain
ibmvfc_get_fc_type
ibmvfc_set_tgt_action
ibmvfc_set_host_state
ibmvfc_set_host_action
ibmvfc_reinit_host
ibmvfc_link_down
ibmvfc_init_host
ibmvfc_send_crq
ibmvfc_send_crq_init
ibmvfc_send_crq_init_complete
ibmvfc_release_crq_queue
ibmvfc_reenable_crq_queue
ibmvfc_reset_crq
ibmvfc_valid_event
ibmvfc_free_event
ibmvfc_scsi_eh_done
ibmvfc_fail_request
ibmvfc_purge_requests
ibmvfc_hard_reset_host
__ibmvfc_reset_host
ibmvfc_reset_host
ibmvfc_retry_host_init
__ibmvfc_get_target
ibmvfc_get_target
ibmvfc_get_host_speed
ibmvfc_get_host_port_state
ibmvfc_set_rport_dev_loss_tmo
ibmvfc_release_tgt
ibmvfc_get_starget_node_name
ibmvfc_get_starget_port_name
ibmvfc_get_starget_port_id
ibmvfc_wait_while_resetting
ibmvfc_issue_fc_host_lip
ibmvfc_gather_partition_info
ibmvfc_set_login_info
ibmvfc_init_event_pool
ibmvfc_free_event_pool
ibmvfc_get_event
ibmvfc_init_event
ibmvfc_map_sg_list
ibmvfc_map_sg_data
ibmvfc_timeout
ibmvfc_send_event
ibmvfc_log_error
ibmvfc_relogin
ibmvfc_scsi_done
ibmvfc_host_chkready
ibmvfc_queuecommand_lck
DEF_SCSI_QCMD
ibmvfc_bsg_timeout_done
ibmvfc_bsg_timeout
ibmvfc_bsg_plogi
ibmvfc_bsg_request
ibmvfc_reset_device
ibmvfc_match_rport
ibmvfc_match_target
ibmvfc_match_lun
ibmvfc_wait_for_ops
ibmvfc_cancel_all
ibmvfc_match_key
ibmvfc_match_evt
ibmvfc_abort_task_set
ibmvfc_eh_abort_handler
ibmvfc_eh_device_reset_handler
ibmvfc_dev_cancel_all_noreset
ibmvfc_dev_cancel_all_reset
ibmvfc_eh_target_reset_handler
ibmvfc_eh_host_reset_handler
ibmvfc_terminate_rport_io
ibmvfc_get_ae_desc
ibmvfc_get_link_state
ibmvfc_handle_async
ibmvfc_handle_crq
ibmvfc_scan_finished
ibmvfc_slave_alloc
ibmvfc_target_alloc
ibmvfc_slave_configure
ibmvfc_change_queue_depth
ibmvfc_show_host_partition_name
ibmvfc_show_host_device_name
ibmvfc_show_host_loc_code
ibmvfc_show_host_drc_name
ibmvfc_show_host_npiv_version
ibmvfc_show_host_capabilities
ibmvfc_show_log_level
ibmvfc_store_log_level
ibmvfc_read_trace
ibmvfc_next_async_crq
ibmvfc_next_crq
ibmvfc_interrupt
ibmvfc_tasklet
ibmvfc_init_tgt
ibmvfc_retry_tgt_init
ibmvfc_get_prli_rsp
ibmvfc_tgt_prli_done
ibmvfc_tgt_send_prli
ibmvfc_tgt_plogi_done
ibmvfc_tgt_send_plogi
ibmvfc_tgt_implicit_logout_done
ibmvfc_tgt_implicit_logout
ibmvfc_adisc_needs_plogi
ibmvfc_tgt_adisc_done
ibmvfc_init_passthru
ibmvfc_tgt_adisc_cancel_done
ibmvfc_adisc_timeout
ibmvfc_tgt_adisc
ibmvfc_tgt_query_target_done
ibmvfc_tgt_query_target
ibmvfc_alloc_target
ibmvfc_alloc_targets
ibmvfc_discover_targets_done
ibmvfc_discover_targets
ibmvfc_npiv_login_done
ibmvfc_npiv_login
ibmvfc_npiv_logout_done
ibmvfc_npiv_logout
ibmvfc_dev_init_to_do
__ibmvfc_work_to_do
ibmvfc_work_to_do
ibmvfc_log_ae
ibmvfc_tgt_add_rport
ibmvfc_do_work
ibmvfc_work
ibmvfc_init_crq
ibmvfc_free_mem
ibmvfc_alloc_mem
ibmvfc_rport_add_thread
ibmvfc_probe
ibmvfc_remove
ibmvfc_resume
ibmvfc_get_desired_dma
ibmvfc_module_init
ibmvfc_module_exit
   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/kthread.h>
  17 #include <linux/slab.h>
  18 #include <linux/of.h>
  19 #include <linux/pm.h>
  20 #include <linux/stringify.h>
  21 #include <linux/bsg-lib.h>
  22 #include <asm/firmware.h>
  23 #include <asm/irq.h>
  24 #include <asm/vio.h>
  25 #include <scsi/scsi.h>
  26 #include <scsi/scsi_cmnd.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/scsi_tcq.h>
  30 #include <scsi/scsi_transport_fc.h>
  31 #include <scsi/scsi_bsg_fc.h>
  32 #include "ibmvfc.h"
  33 
  34 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  35 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  36 static u64 max_lun = IBMVFC_MAX_LUN;
  37 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  38 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  39 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  40 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  41 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  42 static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
  43 static LIST_HEAD(ibmvfc_head);
  44 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  45 static struct scsi_transport_template *ibmvfc_transport_template;
  46 
  47 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  48 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  49 MODULE_LICENSE("GPL");
  50 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  51 
  52 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  53 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  54                  "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  55 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  56 MODULE_PARM_DESC(default_timeout,
  57                  "Default timeout in seconds for initialization and EH commands. "
  58                  "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  59 module_param_named(max_requests, max_requests, uint, S_IRUGO);
  60 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  61                  "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  62 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
  63 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  64                  "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  65 module_param_named(max_targets, max_targets, uint, S_IRUGO);
  66 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  67                  "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  68 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
  69 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
  70                  "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
  71 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
  72 MODULE_PARM_DESC(debug, "Enable driver debug information. "
  73                  "[Default=" __stringify(IBMVFC_DEBUG) "]");
  74 module_param_named(log_level, log_level, uint, 0);
  75 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
  76                  "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
  77 module_param_named(cls3_error, cls3_error, uint, 0);
  78 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
  79                  "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
  80 
  81 static const struct {
  82         u16 status;
  83         u16 error;
  84         u8 result;
  85         u8 retry;
  86         int log;
  87         char *name;
  88 } cmd_status [] = {
  89         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
  90         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
  91         { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
  92         { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
  93         { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
  94         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
  95         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
  96         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
  97         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
  98         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
  99         { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 100         { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 101         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 102         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 103 
 104         { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 105         { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 106         { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 107         { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 108         { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 109         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 110         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 111         { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 112         { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 113         { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 114 
 115         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 116         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 117         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 118         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 119         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 120         { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 121         { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 122         { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 123         { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 124         { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 125         { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 126 
 127         { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 128         { IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
 129 };
 130 
 131 static void ibmvfc_npiv_login(struct ibmvfc_host *);
 132 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 133 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 134 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 135 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 136 
 137 static const char *unknown_error = "unknown error";
 138 
 139 #ifdef CONFIG_SCSI_IBMVFC_TRACE
 140 /**
 141  * ibmvfc_trc_start - Log a start trace entry
 142  * @evt:                ibmvfc event struct
 143  *
 144  **/
 145 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 146 {
 147         struct ibmvfc_host *vhost = evt->vhost;
 148         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 149         struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 150         struct ibmvfc_trace_entry *entry;
 151 
 152         entry = &vhost->trace[vhost->trace_index++];
 153         entry->evt = evt;
 154         entry->time = jiffies;
 155         entry->fmt = evt->crq.format;
 156         entry->type = IBMVFC_TRC_START;
 157 
 158         switch (entry->fmt) {
 159         case IBMVFC_CMD_FORMAT:
 160                 entry->op_code = vfc_cmd->iu.cdb[0];
 161                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 162                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 163                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 164                 entry->u.start.xfer_len = be32_to_cpu(vfc_cmd->iu.xfer_len);
 165                 break;
 166         case IBMVFC_MAD_FORMAT:
 167                 entry->op_code = be32_to_cpu(mad->opcode);
 168                 break;
 169         default:
 170                 break;
 171         }
 172 }
 173 
 174 /**
 175  * ibmvfc_trc_end - Log an end trace entry
 176  * @evt:                ibmvfc event struct
 177  *
 178  **/
 179 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 180 {
 181         struct ibmvfc_host *vhost = evt->vhost;
 182         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 183         struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 184         struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
 185 
 186         entry->evt = evt;
 187         entry->time = jiffies;
 188         entry->fmt = evt->crq.format;
 189         entry->type = IBMVFC_TRC_END;
 190 
 191         switch (entry->fmt) {
 192         case IBMVFC_CMD_FORMAT:
 193                 entry->op_code = vfc_cmd->iu.cdb[0];
 194                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 195                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
 196                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
 197                 entry->u.end.status = be16_to_cpu(vfc_cmd->status);
 198                 entry->u.end.error = be16_to_cpu(vfc_cmd->error);
 199                 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
 200                 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
 201                 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
 202                 break;
 203         case IBMVFC_MAD_FORMAT:
 204                 entry->op_code = be32_to_cpu(mad->opcode);
 205                 entry->u.end.status = be16_to_cpu(mad->status);
 206                 break;
 207         default:
 208                 break;
 209 
 210         }
 211 }
 212 
 213 #else
 214 #define ibmvfc_trc_start(evt) do { } while (0)
 215 #define ibmvfc_trc_end(evt) do { } while (0)
 216 #endif
 217 
 218 /**
 219  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 220  * @status:             status / error class
 221  * @error:              error
 222  *
 223  * Return value:
 224  *      index into cmd_status / -EINVAL on failure
 225  **/
 226 static int ibmvfc_get_err_index(u16 status, u16 error)
 227 {
 228         int i;
 229 
 230         for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 231                 if ((cmd_status[i].status & status) == cmd_status[i].status &&
 232                     cmd_status[i].error == error)
 233                         return i;
 234 
 235         return -EINVAL;
 236 }
 237 
 238 /**
 239  * ibmvfc_get_cmd_error - Find the error description for the fcp response
 240  * @status:             status / error class
 241  * @error:              error
 242  *
 243  * Return value:
 244  *      error description string
 245  **/
 246 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 247 {
 248         int rc = ibmvfc_get_err_index(status, error);
 249         if (rc >= 0)
 250                 return cmd_status[rc].name;
 251         return unknown_error;
 252 }
 253 
 254 /**
 255  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 256  * @vfc_cmd:    ibmvfc command struct
 257  *
 258  * Return value:
 259  *      SCSI result value to return for completed command
 260  **/
 261 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
 262 {
 263         int err;
 264         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
 265         int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
 266 
 267         if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 268             ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 269              rsp->data.info.rsp_code))
 270                 return DID_ERROR << 16;
 271 
 272         err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
 273         if (err >= 0)
 274                 return rsp->scsi_status | (cmd_status[err].result << 16);
 275         return rsp->scsi_status | (DID_ERROR << 16);
 276 }
 277 
 278 /**
 279  * ibmvfc_retry_cmd - Determine if error status is retryable
 280  * @status:             status / error class
 281  * @error:              error
 282  *
 283  * Return value:
 284  *      1 if error should be retried / 0 if it should not
 285  **/
 286 static int ibmvfc_retry_cmd(u16 status, u16 error)
 287 {
 288         int rc = ibmvfc_get_err_index(status, error);
 289 
 290         if (rc >= 0)
 291                 return cmd_status[rc].retry;
 292         return 1;
 293 }
 294 
 295 static const char *unknown_fc_explain = "unknown fc explain";
 296 
 297 static const struct {
 298         u16 fc_explain;
 299         char *name;
 300 } ls_explain [] = {
 301         { 0x00, "no additional explanation" },
 302         { 0x01, "service parameter error - options" },
 303         { 0x03, "service parameter error - initiator control" },
 304         { 0x05, "service parameter error - recipient control" },
 305         { 0x07, "service parameter error - received data field size" },
 306         { 0x09, "service parameter error - concurrent seq" },
 307         { 0x0B, "service parameter error - credit" },
 308         { 0x0D, "invalid N_Port/F_Port_Name" },
 309         { 0x0E, "invalid node/Fabric Name" },
 310         { 0x0F, "invalid common service parameters" },
 311         { 0x11, "invalid association header" },
 312         { 0x13, "association header required" },
 313         { 0x15, "invalid originator S_ID" },
 314         { 0x17, "invalid OX_ID-RX-ID combination" },
 315         { 0x19, "command (request) already in progress" },
 316         { 0x1E, "N_Port Login requested" },
 317         { 0x1F, "Invalid N_Port_ID" },
 318 };
 319 
 320 static const struct {
 321         u16 fc_explain;
 322         char *name;
 323 } gs_explain [] = {
 324         { 0x00, "no additional explanation" },
 325         { 0x01, "port identifier not registered" },
 326         { 0x02, "port name not registered" },
 327         { 0x03, "node name not registered" },
 328         { 0x04, "class of service not registered" },
 329         { 0x06, "initial process associator not registered" },
 330         { 0x07, "FC-4 TYPEs not registered" },
 331         { 0x08, "symbolic port name not registered" },
 332         { 0x09, "symbolic node name not registered" },
 333         { 0x0A, "port type not registered" },
 334         { 0xF0, "authorization exception" },
 335         { 0xF1, "authentication exception" },
 336         { 0xF2, "data base full" },
 337         { 0xF3, "data base empty" },
 338         { 0xF4, "processing request" },
 339         { 0xF5, "unable to verify connection" },
 340         { 0xF6, "devices not in a common zone" },
 341 };
 342 
 343 /**
 344  * ibmvfc_get_ls_explain - Return the FC Explain description text
 345  * @status:     FC Explain status
 346  *
 347  * Returns:
 348  *      error string
 349  **/
 350 static const char *ibmvfc_get_ls_explain(u16 status)
 351 {
 352         int i;
 353 
 354         for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 355                 if (ls_explain[i].fc_explain == status)
 356                         return ls_explain[i].name;
 357 
 358         return unknown_fc_explain;
 359 }
 360 
 361 /**
 362  * ibmvfc_get_gs_explain - Return the FC Explain description text
 363  * @status:     FC Explain status
 364  *
 365  * Returns:
 366  *      error string
 367  **/
 368 static const char *ibmvfc_get_gs_explain(u16 status)
 369 {
 370         int i;
 371 
 372         for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 373                 if (gs_explain[i].fc_explain == status)
 374                         return gs_explain[i].name;
 375 
 376         return unknown_fc_explain;
 377 }
 378 
 379 static const struct {
 380         enum ibmvfc_fc_type fc_type;
 381         char *name;
 382 } fc_type [] = {
 383         { IBMVFC_FABRIC_REJECT, "fabric reject" },
 384         { IBMVFC_PORT_REJECT, "port reject" },
 385         { IBMVFC_LS_REJECT, "ELS reject" },
 386         { IBMVFC_FABRIC_BUSY, "fabric busy" },
 387         { IBMVFC_PORT_BUSY, "port busy" },
 388         { IBMVFC_BASIC_REJECT, "basic reject" },
 389 };
 390 
 391 static const char *unknown_fc_type = "unknown fc type";
 392 
 393 /**
 394  * ibmvfc_get_fc_type - Return the FC Type description text
 395  * @status:     FC Type error status
 396  *
 397  * Returns:
 398  *      error string
 399  **/
 400 static const char *ibmvfc_get_fc_type(u16 status)
 401 {
 402         int i;
 403 
 404         for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 405                 if (fc_type[i].fc_type == status)
 406                         return fc_type[i].name;
 407 
 408         return unknown_fc_type;
 409 }
 410 
 411 /**
 412  * ibmvfc_set_tgt_action - Set the next init action for the target
 413  * @tgt:                ibmvfc target struct
 414  * @action:             action to perform
 415  *
 416  **/
 417 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 418                                   enum ibmvfc_target_action action)
 419 {
 420         switch (tgt->action) {
 421         case IBMVFC_TGT_ACTION_DEL_RPORT:
 422                 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
 423                         tgt->action = action;
 424         case IBMVFC_TGT_ACTION_DELETED_RPORT:
 425                 break;
 426         default:
 427                 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
 428                         tgt->add_rport = 0;
 429                 tgt->action = action;
 430                 break;
 431         }
 432 }
 433 
 434 /**
 435  * ibmvfc_set_host_state - Set the state for the host
 436  * @vhost:              ibmvfc host struct
 437  * @state:              state to set host to
 438  *
 439  * Returns:
 440  *      0 if state changed / non-zero if not changed
 441  **/
 442 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
 443                                   enum ibmvfc_host_state state)
 444 {
 445         int rc = 0;
 446 
 447         switch (vhost->state) {
 448         case IBMVFC_HOST_OFFLINE:
 449                 rc = -EINVAL;
 450                 break;
 451         default:
 452                 vhost->state = state;
 453                 break;
 454         }
 455 
 456         return rc;
 457 }
 458 
 459 /**
 460  * ibmvfc_set_host_action - Set the next init action for the host
 461  * @vhost:              ibmvfc host struct
 462  * @action:             action to perform
 463  *
 464  **/
 465 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 466                                    enum ibmvfc_host_action action)
 467 {
 468         switch (action) {
 469         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 470                 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
 471                         vhost->action = action;
 472                 break;
 473         case IBMVFC_HOST_ACTION_LOGO_WAIT:
 474                 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
 475                         vhost->action = action;
 476                 break;
 477         case IBMVFC_HOST_ACTION_INIT_WAIT:
 478                 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
 479                         vhost->action = action;
 480                 break;
 481         case IBMVFC_HOST_ACTION_QUERY:
 482                 switch (vhost->action) {
 483                 case IBMVFC_HOST_ACTION_INIT_WAIT:
 484                 case IBMVFC_HOST_ACTION_NONE:
 485                 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 486                         vhost->action = action;
 487                         break;
 488                 default:
 489                         break;
 490                 }
 491                 break;
 492         case IBMVFC_HOST_ACTION_TGT_INIT:
 493                 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 494                         vhost->action = action;
 495                 break;
 496         case IBMVFC_HOST_ACTION_INIT:
 497         case IBMVFC_HOST_ACTION_TGT_DEL:
 498                 switch (vhost->action) {
 499                 case IBMVFC_HOST_ACTION_RESET:
 500                 case IBMVFC_HOST_ACTION_REENABLE:
 501                         break;
 502                 default:
 503                         vhost->action = action;
 504                         break;
 505                 }
 506                 break;
 507         case IBMVFC_HOST_ACTION_LOGO:
 508         case IBMVFC_HOST_ACTION_QUERY_TGTS:
 509         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 510         case IBMVFC_HOST_ACTION_NONE:
 511         case IBMVFC_HOST_ACTION_RESET:
 512         case IBMVFC_HOST_ACTION_REENABLE:
 513         default:
 514                 vhost->action = action;
 515                 break;
 516         }
 517 }
 518 
 519 /**
 520  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 521  * @vhost:              ibmvfc host struct
 522  *
 523  * Return value:
 524  *      nothing
 525  **/
 526 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 527 {
 528         if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
 529                 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 530                         scsi_block_requests(vhost->host);
 531                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 532                 }
 533         } else
 534                 vhost->reinit = 1;
 535 
 536         wake_up(&vhost->work_wait_q);
 537 }
 538 
 539 /**
 540  * ibmvfc_link_down - Handle a link down event from the adapter
 541  * @vhost:      ibmvfc host struct
 542  * @state:      ibmvfc host state to enter
 543  *
 544  **/
 545 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 546                              enum ibmvfc_host_state state)
 547 {
 548         struct ibmvfc_target *tgt;
 549 
 550         ENTER;
 551         scsi_block_requests(vhost->host);
 552         list_for_each_entry(tgt, &vhost->targets, queue)
 553                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 554         ibmvfc_set_host_state(vhost, state);
 555         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 556         vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 557         wake_up(&vhost->work_wait_q);
 558         LEAVE;
 559 }
 560 
 561 /**
 562  * ibmvfc_init_host - Start host initialization
 563  * @vhost:              ibmvfc host struct
 564  *
 565  * Return value:
 566  *      nothing
 567  **/
 568 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
 569 {
 570         struct ibmvfc_target *tgt;
 571 
 572         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 573                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 574                         dev_err(vhost->dev,
 575                                 "Host initialization retries exceeded. Taking adapter offline\n");
 576                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 577                         return;
 578                 }
 579         }
 580 
 581         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 582                 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
 583                 vhost->async_crq.cur = 0;
 584 
 585                 list_for_each_entry(tgt, &vhost->targets, queue)
 586                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
 587                 scsi_block_requests(vhost->host);
 588                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 589                 vhost->job_step = ibmvfc_npiv_login;
 590                 wake_up(&vhost->work_wait_q);
 591         }
 592 }
 593 
 594 /**
 595  * ibmvfc_send_crq - Send a CRQ
 596  * @vhost:      ibmvfc host struct
 597  * @word1:      the first 64 bits of the data
 598  * @word2:      the second 64 bits of the data
 599  *
 600  * Return value:
 601  *      0 on success / other on failure
 602  **/
 603 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 604 {
 605         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 606         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 607 }
 608 
 609 /**
 610  * ibmvfc_send_crq_init - Send a CRQ init message
 611  * @vhost:      ibmvfc host struct
 612  *
 613  * Return value:
 614  *      0 on success / other on failure
 615  **/
 616 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
 617 {
 618         ibmvfc_dbg(vhost, "Sending CRQ init\n");
 619         return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 620 }
 621 
 622 /**
 623  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 624  * @vhost:      ibmvfc host struct
 625  *
 626  * Return value:
 627  *      0 on success / other on failure
 628  **/
 629 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 630 {
 631         ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 632         return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 633 }
 634 
 635 /**
 636  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 637  * @vhost:      ibmvfc host struct
 638  *
 639  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 640  * the crq with the hypervisor.
 641  **/
 642 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 643 {
 644         long rc = 0;
 645         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 646         struct ibmvfc_crq_queue *crq = &vhost->crq;
 647 
 648         ibmvfc_dbg(vhost, "Releasing CRQ\n");
 649         free_irq(vdev->irq, vhost);
 650         tasklet_kill(&vhost->tasklet);
 651         do {
 652                 if (rc)
 653                         msleep(100);
 654                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 655         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 656 
 657         vhost->state = IBMVFC_NO_CRQ;
 658         vhost->logged_in = 0;
 659         dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 660         free_page((unsigned long)crq->msgs);
 661 }
 662 
 663 /**
 664  * ibmvfc_reenable_crq_queue - reenables the CRQ
 665  * @vhost:      ibmvfc host struct
 666  *
 667  * Return value:
 668  *      0 on success / other on failure
 669  **/
 670 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 671 {
 672         int rc = 0;
 673         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 674 
 675         /* Re-enable the CRQ */
 676         do {
 677                 if (rc)
 678                         msleep(100);
 679                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 680         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 681 
 682         if (rc)
 683                 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 684 
 685         return rc;
 686 }
 687 
 688 /**
 689  * ibmvfc_reset_crq - resets a crq after a failure
 690  * @vhost:      ibmvfc host struct
 691  *
 692  * Return value:
 693  *      0 on success / other on failure
 694  **/
 695 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 696 {
 697         int rc = 0;
 698         unsigned long flags;
 699         struct vio_dev *vdev = to_vio_dev(vhost->dev);
 700         struct ibmvfc_crq_queue *crq = &vhost->crq;
 701 
 702         /* Close the CRQ */
 703         do {
 704                 if (rc)
 705                         msleep(100);
 706                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 707         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 708 
 709         spin_lock_irqsave(vhost->host->host_lock, flags);
 710         vhost->state = IBMVFC_NO_CRQ;
 711         vhost->logged_in = 0;
 712 
 713         /* Clean out the queue */
 714         memset(crq->msgs, 0, PAGE_SIZE);
 715         crq->cur = 0;
 716 
 717         /* And re-open it again */
 718         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 719                                 crq->msg_token, PAGE_SIZE);
 720 
 721         if (rc == H_CLOSED)
 722                 /* Adapter is good, but other end is not ready */
 723                 dev_warn(vhost->dev, "Partner adapter not ready\n");
 724         else if (rc != 0)
 725                 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 726         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 727 
 728         return rc;
 729 }
 730 
 731 /**
 732  * ibmvfc_valid_event - Determines if event is valid.
 733  * @pool:       event_pool that contains the event
 734  * @evt:        ibmvfc event to be checked for validity
 735  *
 736  * Return value:
 737  *      1 if event is valid / 0 if event is not valid
 738  **/
 739 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
 740                               struct ibmvfc_event *evt)
 741 {
 742         int index = evt - pool->events;
 743         if (index < 0 || index >= pool->size)   /* outside of bounds */
 744                 return 0;
 745         if (evt != pool->events + index)        /* unaligned */
 746                 return 0;
 747         return 1;
 748 }
 749 
 750 /**
 751  * ibmvfc_free_event - Free the specified event
 752  * @evt:        ibmvfc_event to be freed
 753  *
 754  **/
 755 static void ibmvfc_free_event(struct ibmvfc_event *evt)
 756 {
 757         struct ibmvfc_host *vhost = evt->vhost;
 758         struct ibmvfc_event_pool *pool = &vhost->pool;
 759 
 760         BUG_ON(!ibmvfc_valid_event(pool, evt));
 761         BUG_ON(atomic_inc_return(&evt->free) != 1);
 762         list_add_tail(&evt->queue, &vhost->free);
 763 }
 764 
 765 /**
 766  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
 767  * @evt:        ibmvfc event struct
 768  *
 769  * This function does not setup any error status, that must be done
 770  * before this function gets called.
 771  **/
 772 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
 773 {
 774         struct scsi_cmnd *cmnd = evt->cmnd;
 775 
 776         if (cmnd) {
 777                 scsi_dma_unmap(cmnd);
 778                 cmnd->scsi_done(cmnd);
 779         }
 780 
 781         if (evt->eh_comp)
 782                 complete(evt->eh_comp);
 783 
 784         ibmvfc_free_event(evt);
 785 }
 786 
 787 /**
 788  * ibmvfc_fail_request - Fail request with specified error code
 789  * @evt:                ibmvfc event struct
 790  * @error_code: error code to fail request with
 791  *
 792  * Return value:
 793  *      none
 794  **/
 795 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
 796 {
 797         if (evt->cmnd) {
 798                 evt->cmnd->result = (error_code << 16);
 799                 evt->done = ibmvfc_scsi_eh_done;
 800         } else
 801                 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
 802 
 803         list_del(&evt->queue);
 804         del_timer(&evt->timer);
 805         ibmvfc_trc_end(evt);
 806         evt->done(evt);
 807 }
 808 
 809 /**
 810  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
 811  * @vhost:              ibmvfc host struct
 812  * @error_code: error code to fail requests with
 813  *
 814  * Return value:
 815  *      none
 816  **/
 817 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
 818 {
 819         struct ibmvfc_event *evt, *pos;
 820 
 821         ibmvfc_dbg(vhost, "Purging all requests\n");
 822         list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
 823                 ibmvfc_fail_request(evt, error_code);
 824 }
 825 
 826 /**
 827  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
 828  * @vhost:      struct ibmvfc host to reset
 829  **/
 830 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
 831 {
 832         ibmvfc_purge_requests(vhost, DID_ERROR);
 833         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
 834         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
 835 }
 836 
 837 /**
 838  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
 839  * @vhost:      struct ibmvfc host to reset
 840  **/
 841 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
 842 {
 843         if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
 844             !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 845                 scsi_block_requests(vhost->host);
 846                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
 847                 vhost->job_step = ibmvfc_npiv_logout;
 848                 wake_up(&vhost->work_wait_q);
 849         } else
 850                 ibmvfc_hard_reset_host(vhost);
 851 }
 852 
 853 /**
 854  * ibmvfc_reset_host - Reset the connection to the server
 855  * @vhost:      ibmvfc host struct
 856  **/
 857 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
 858 {
 859         unsigned long flags;
 860 
 861         spin_lock_irqsave(vhost->host->host_lock, flags);
 862         __ibmvfc_reset_host(vhost);
 863         spin_unlock_irqrestore(vhost->host->host_lock, flags);
 864 }
 865 
 866 /**
 867  * ibmvfc_retry_host_init - Retry host initialization if allowed
 868  * @vhost:      ibmvfc host struct
 869  *
 870  * Returns: 1 if init will be retried / 0 if not
 871  *
 872  **/
 873 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
 874 {
 875         int retry = 0;
 876 
 877         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 878                 vhost->delay_init = 1;
 879                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 880                         dev_err(vhost->dev,
 881                                 "Host initialization retries exceeded. Taking adapter offline\n");
 882                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 883                 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
 884                         __ibmvfc_reset_host(vhost);
 885                 else {
 886                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 887                         retry = 1;
 888                 }
 889         }
 890 
 891         wake_up(&vhost->work_wait_q);
 892         return retry;
 893 }
 894 
 895 /**
 896  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
 897  * @starget:    scsi target struct
 898  *
 899  * Return value:
 900  *      ibmvfc_target struct / NULL if not found
 901  **/
 902 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
 903 {
 904         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 905         struct ibmvfc_host *vhost = shost_priv(shost);
 906         struct ibmvfc_target *tgt;
 907 
 908         list_for_each_entry(tgt, &vhost->targets, queue)
 909                 if (tgt->target_id == starget->id) {
 910                         kref_get(&tgt->kref);
 911                         return tgt;
 912                 }
 913         return NULL;
 914 }
 915 
 916 /**
 917  * ibmvfc_get_target - Find the specified scsi_target
 918  * @starget:    scsi target struct
 919  *
 920  * Return value:
 921  *      ibmvfc_target struct / NULL if not found
 922  **/
 923 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
 924 {
 925         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 926         struct ibmvfc_target *tgt;
 927         unsigned long flags;
 928 
 929         spin_lock_irqsave(shost->host_lock, flags);
 930         tgt = __ibmvfc_get_target(starget);
 931         spin_unlock_irqrestore(shost->host_lock, flags);
 932         return tgt;
 933 }
 934 
 935 /**
 936  * ibmvfc_get_host_speed - Get host port speed
 937  * @shost:              scsi host struct
 938  *
 939  * Return value:
 940  *      none
 941  **/
 942 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
 943 {
 944         struct ibmvfc_host *vhost = shost_priv(shost);
 945         unsigned long flags;
 946 
 947         spin_lock_irqsave(shost->host_lock, flags);
 948         if (vhost->state == IBMVFC_ACTIVE) {
 949                 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
 950                 case 1:
 951                         fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
 952                         break;
 953                 case 2:
 954                         fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
 955                         break;
 956                 case 4:
 957                         fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
 958                         break;
 959                 case 8:
 960                         fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
 961                         break;
 962                 case 10:
 963                         fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
 964                         break;
 965                 case 16:
 966                         fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
 967                         break;
 968                 default:
 969                         ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
 970                                    be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
 971                         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 972                         break;
 973                 }
 974         } else
 975                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 976         spin_unlock_irqrestore(shost->host_lock, flags);
 977 }
 978 
 979 /**
 980  * ibmvfc_get_host_port_state - Get host port state
 981  * @shost:              scsi host struct
 982  *
 983  * Return value:
 984  *      none
 985  **/
 986 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
 987 {
 988         struct ibmvfc_host *vhost = shost_priv(shost);
 989         unsigned long flags;
 990 
 991         spin_lock_irqsave(shost->host_lock, flags);
 992         switch (vhost->state) {
 993         case IBMVFC_INITIALIZING:
 994         case IBMVFC_ACTIVE:
 995                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 996                 break;
 997         case IBMVFC_LINK_DOWN:
 998                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 999                 break;
1000         case IBMVFC_LINK_DEAD:
1001         case IBMVFC_HOST_OFFLINE:
1002                 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1003                 break;
1004         case IBMVFC_HALTED:
1005                 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1006                 break;
1007         case IBMVFC_NO_CRQ:
1008                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1009                 break;
1010         default:
1011                 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1012                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1013                 break;
1014         }
1015         spin_unlock_irqrestore(shost->host_lock, flags);
1016 }
1017 
1018 /**
1019  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1020  * @rport:              rport struct
1021  * @timeout:    timeout value
1022  *
1023  * Return value:
1024  *      none
1025  **/
1026 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1027 {
1028         if (timeout)
1029                 rport->dev_loss_tmo = timeout;
1030         else
1031                 rport->dev_loss_tmo = 1;
1032 }
1033 
1034 /**
1035  * ibmvfc_release_tgt - Free memory allocated for a target
1036  * @kref:               kref struct
1037  *
1038  **/
1039 static void ibmvfc_release_tgt(struct kref *kref)
1040 {
1041         struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1042         kfree(tgt);
1043 }
1044 
1045 /**
1046  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1047  * @starget:    scsi target struct
1048  *
1049  * Return value:
1050  *      none
1051  **/
1052 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1053 {
1054         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1055         fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1056         if (tgt)
1057                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1058 }
1059 
1060 /**
1061  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1062  * @starget:    scsi target struct
1063  *
1064  * Return value:
1065  *      none
1066  **/
1067 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1068 {
1069         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1070         fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1071         if (tgt)
1072                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1073 }
1074 
1075 /**
1076  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1077  * @starget:    scsi target struct
1078  *
1079  * Return value:
1080  *      none
1081  **/
1082 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1083 {
1084         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1085         fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1086         if (tgt)
1087                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1088 }
1089 
1090 /**
1091  * ibmvfc_wait_while_resetting - Wait while the host resets
1092  * @vhost:              ibmvfc host struct
1093  *
1094  * Return value:
1095  *      0 on success / other on failure
1096  **/
1097 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1098 {
1099         long timeout = wait_event_timeout(vhost->init_wait_q,
1100                                           ((vhost->state == IBMVFC_ACTIVE ||
1101                                             vhost->state == IBMVFC_HOST_OFFLINE ||
1102                                             vhost->state == IBMVFC_LINK_DEAD) &&
1103                                            vhost->action == IBMVFC_HOST_ACTION_NONE),
1104                                           (init_timeout * HZ));
1105 
1106         return timeout ? 0 : -EIO;
1107 }
1108 
1109 /**
1110  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1111  * @shost:              scsi host struct
1112  *
1113  * Return value:
1114  *      0 on success / other on failure
1115  **/
1116 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1117 {
1118         struct ibmvfc_host *vhost = shost_priv(shost);
1119 
1120         dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1121         ibmvfc_reset_host(vhost);
1122         return ibmvfc_wait_while_resetting(vhost);
1123 }
1124 
1125 /**
1126  * ibmvfc_gather_partition_info - Gather info about the LPAR
1127  *
1128  * Return value:
1129  *      none
1130  **/
1131 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1132 {
1133         struct device_node *rootdn;
1134         const char *name;
1135         const unsigned int *num;
1136 
1137         rootdn = of_find_node_by_path("/");
1138         if (!rootdn)
1139                 return;
1140 
1141         name = of_get_property(rootdn, "ibm,partition-name", NULL);
1142         if (name)
1143                 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1144         num = of_get_property(rootdn, "ibm,partition-no", NULL);
1145         if (num)
1146                 vhost->partition_number = *num;
1147         of_node_put(rootdn);
1148 }
1149 
1150 /**
1151  * ibmvfc_set_login_info - Setup info for NPIV login
1152  * @vhost:      ibmvfc host struct
1153  *
1154  * Return value:
1155  *      none
1156  **/
1157 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1158 {
1159         struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1160         struct device_node *of_node = vhost->dev->of_node;
1161         const char *location;
1162 
1163         memset(login_info, 0, sizeof(*login_info));
1164 
1165         login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1166         login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1167         login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1168         login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1169         login_info->partition_num = cpu_to_be32(vhost->partition_number);
1170         login_info->vfc_frame_version = cpu_to_be32(1);
1171         login_info->fcp_version = cpu_to_be16(3);
1172         login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1173         if (vhost->client_migrated)
1174                 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1175 
1176         login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1177         login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE);
1178         login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1179         login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs));
1180         strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1181         strncpy(login_info->device_name,
1182                 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1183 
1184         location = of_get_property(of_node, "ibm,loc-code", NULL);
1185         location = location ? location : dev_name(vhost->dev);
1186         strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1187 }
1188 
1189 /**
1190  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1191  * @vhost:      ibmvfc host who owns the event pool
1192  *
1193  * Returns zero on success.
1194  **/
1195 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1196 {
1197         int i;
1198         struct ibmvfc_event_pool *pool = &vhost->pool;
1199 
1200         ENTER;
1201         pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1202         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1203         if (!pool->events)
1204                 return -ENOMEM;
1205 
1206         pool->iu_storage = dma_alloc_coherent(vhost->dev,
1207                                               pool->size * sizeof(*pool->iu_storage),
1208                                               &pool->iu_token, 0);
1209 
1210         if (!pool->iu_storage) {
1211                 kfree(pool->events);
1212                 return -ENOMEM;
1213         }
1214 
1215         for (i = 0; i < pool->size; ++i) {
1216                 struct ibmvfc_event *evt = &pool->events[i];
1217                 atomic_set(&evt->free, 1);
1218                 evt->crq.valid = 0x80;
1219                 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
1220                 evt->xfer_iu = pool->iu_storage + i;
1221                 evt->vhost = vhost;
1222                 evt->ext_list = NULL;
1223                 list_add_tail(&evt->queue, &vhost->free);
1224         }
1225 
1226         LEAVE;
1227         return 0;
1228 }
1229 
1230 /**
1231  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1232  * @vhost:      ibmvfc host who owns the event pool
1233  *
1234  **/
1235 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1236 {
1237         int i;
1238         struct ibmvfc_event_pool *pool = &vhost->pool;
1239 
1240         ENTER;
1241         for (i = 0; i < pool->size; ++i) {
1242                 list_del(&pool->events[i].queue);
1243                 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1244                 if (pool->events[i].ext_list)
1245                         dma_pool_free(vhost->sg_pool,
1246                                       pool->events[i].ext_list,
1247                                       pool->events[i].ext_list_token);
1248         }
1249 
1250         kfree(pool->events);
1251         dma_free_coherent(vhost->dev,
1252                           pool->size * sizeof(*pool->iu_storage),
1253                           pool->iu_storage, pool->iu_token);
1254         LEAVE;
1255 }
1256 
1257 /**
1258  * ibmvfc_get_event - Gets the next free event in pool
1259  * @vhost:      ibmvfc host struct
1260  *
1261  * Returns a free event from the pool.
1262  **/
1263 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1264 {
1265         struct ibmvfc_event *evt;
1266 
1267         BUG_ON(list_empty(&vhost->free));
1268         evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1269         atomic_set(&evt->free, 0);
1270         list_del(&evt->queue);
1271         return evt;
1272 }
1273 
1274 /**
1275  * ibmvfc_init_event - Initialize fields in an event struct that are always
1276  *                              required.
1277  * @evt:        The event
1278  * @done:       Routine to call when the event is responded to
1279  * @format:     SRP or MAD format
1280  **/
1281 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1282                               void (*done) (struct ibmvfc_event *), u8 format)
1283 {
1284         evt->cmnd = NULL;
1285         evt->sync_iu = NULL;
1286         evt->crq.format = format;
1287         evt->done = done;
1288         evt->eh_comp = NULL;
1289 }
1290 
1291 /**
1292  * ibmvfc_map_sg_list - Initialize scatterlist
1293  * @scmd:       scsi command struct
1294  * @nseg:       number of scatterlist segments
1295  * @md: memory descriptor list to initialize
1296  **/
1297 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1298                                struct srp_direct_buf *md)
1299 {
1300         int i;
1301         struct scatterlist *sg;
1302 
1303         scsi_for_each_sg(scmd, sg, nseg, i) {
1304                 md[i].va = cpu_to_be64(sg_dma_address(sg));
1305                 md[i].len = cpu_to_be32(sg_dma_len(sg));
1306                 md[i].key = 0;
1307         }
1308 }
1309 
1310 /**
1311  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1312  * @scmd:               struct scsi_cmnd with the scatterlist
1313  * @evt:                ibmvfc event struct
1314  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1315  * @dev:                device for which to map dma memory
1316  *
1317  * Returns:
1318  *      0 on success / non-zero on failure
1319  **/
1320 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1321                               struct ibmvfc_event *evt,
1322                               struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1323 {
1324 
1325         int sg_mapped;
1326         struct srp_direct_buf *data = &vfc_cmd->ioba;
1327         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1328 
1329         if (cls3_error)
1330                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1331 
1332         sg_mapped = scsi_dma_map(scmd);
1333         if (!sg_mapped) {
1334                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1335                 return 0;
1336         } else if (unlikely(sg_mapped < 0)) {
1337                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1338                         scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1339                 return sg_mapped;
1340         }
1341 
1342         if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1343                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1344                 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1345         } else {
1346                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1347                 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1348         }
1349 
1350         if (sg_mapped == 1) {
1351                 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1352                 return 0;
1353         }
1354 
1355         vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1356 
1357         if (!evt->ext_list) {
1358                 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1359                                                &evt->ext_list_token);
1360 
1361                 if (!evt->ext_list) {
1362                         scsi_dma_unmap(scmd);
1363                         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1364                                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1365                         return -ENOMEM;
1366                 }
1367         }
1368 
1369         ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1370 
1371         data->va = cpu_to_be64(evt->ext_list_token);
1372         data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1373         data->key = 0;
1374         return 0;
1375 }
1376 
1377 /**
1378  * ibmvfc_timeout - Internal command timeout handler
1379  * @evt:        struct ibmvfc_event that timed out
1380  *
1381  * Called when an internally generated command times out
1382  **/
1383 static void ibmvfc_timeout(struct timer_list *t)
1384 {
1385         struct ibmvfc_event *evt = from_timer(evt, t, timer);
1386         struct ibmvfc_host *vhost = evt->vhost;
1387         dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1388         ibmvfc_reset_host(vhost);
1389 }
1390 
1391 /**
1392  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1393  * @evt:                event to be sent
1394  * @vhost:              ibmvfc host struct
1395  * @timeout:    timeout in seconds - 0 means do not time command
1396  *
1397  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1398  **/
1399 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1400                              struct ibmvfc_host *vhost, unsigned long timeout)
1401 {
1402         __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1403         int rc;
1404 
1405         /* Copy the IU into the transfer area */
1406         *evt->xfer_iu = evt->iu;
1407         if (evt->crq.format == IBMVFC_CMD_FORMAT)
1408                 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1409         else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1410                 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1411         else
1412                 BUG();
1413 
1414         list_add_tail(&evt->queue, &vhost->sent);
1415         timer_setup(&evt->timer, ibmvfc_timeout, 0);
1416 
1417         if (timeout) {
1418                 evt->timer.expires = jiffies + (timeout * HZ);
1419                 add_timer(&evt->timer);
1420         }
1421 
1422         mb();
1423 
1424         if ((rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1425                                   be64_to_cpu(crq_as_u64[1])))) {
1426                 list_del(&evt->queue);
1427                 del_timer(&evt->timer);
1428 
1429                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1430                  * Firmware will send a CRQ with a transport event (0xFF) to
1431                  * tell this client what has happened to the transport. This
1432                  * will be handled in ibmvfc_handle_crq()
1433                  */
1434                 if (rc == H_CLOSED) {
1435                         if (printk_ratelimit())
1436                                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1437                         if (evt->cmnd)
1438                                 scsi_dma_unmap(evt->cmnd);
1439                         ibmvfc_free_event(evt);
1440                         return SCSI_MLQUEUE_HOST_BUSY;
1441                 }
1442 
1443                 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1444                 if (evt->cmnd) {
1445                         evt->cmnd->result = DID_ERROR << 16;
1446                         evt->done = ibmvfc_scsi_eh_done;
1447                 } else
1448                         evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1449 
1450                 evt->done(evt);
1451         } else
1452                 ibmvfc_trc_start(evt);
1453 
1454         return 0;
1455 }
1456 
1457 /**
1458  * ibmvfc_log_error - Log an error for the failed command if appropriate
1459  * @evt:        ibmvfc event to log
1460  *
1461  **/
1462 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1463 {
1464         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1465         struct ibmvfc_host *vhost = evt->vhost;
1466         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1467         struct scsi_cmnd *cmnd = evt->cmnd;
1468         const char *err = unknown_error;
1469         int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1470         int logerr = 0;
1471         int rsp_code = 0;
1472 
1473         if (index >= 0) {
1474                 logerr = cmd_status[index].log;
1475                 err = cmd_status[index].name;
1476         }
1477 
1478         if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1479                 return;
1480 
1481         if (rsp->flags & FCP_RSP_LEN_VALID)
1482                 rsp_code = rsp->data.info.rsp_code;
1483 
1484         scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1485                     "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1486                     cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1487                     rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1488 }
1489 
1490 /**
1491  * ibmvfc_relogin - Log back into the specified device
1492  * @sdev:       scsi device struct
1493  *
1494  **/
1495 static void ibmvfc_relogin(struct scsi_device *sdev)
1496 {
1497         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1498         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1499         struct ibmvfc_target *tgt;
1500 
1501         list_for_each_entry(tgt, &vhost->targets, queue) {
1502                 if (rport == tgt->rport) {
1503                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1504                         break;
1505                 }
1506         }
1507 
1508         ibmvfc_reinit_host(vhost);
1509 }
1510 
1511 /**
1512  * ibmvfc_scsi_done - Handle responses from commands
1513  * @evt:        ibmvfc event to be handled
1514  *
1515  * Used as a callback when sending scsi cmds.
1516  **/
1517 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1518 {
1519         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1520         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1521         struct scsi_cmnd *cmnd = evt->cmnd;
1522         u32 rsp_len = 0;
1523         u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1524 
1525         if (cmnd) {
1526                 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1527                         scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1528                 else if (rsp->flags & FCP_RESID_UNDER)
1529                         scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1530                 else
1531                         scsi_set_resid(cmnd, 0);
1532 
1533                 if (vfc_cmd->status) {
1534                         cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1535 
1536                         if (rsp->flags & FCP_RSP_LEN_VALID)
1537                                 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1538                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1539                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1540                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1541                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1542                         if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1543                             (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1544                                 ibmvfc_relogin(cmnd->device);
1545 
1546                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1547                                 cmnd->result = (DID_ERROR << 16);
1548 
1549                         ibmvfc_log_error(evt);
1550                 }
1551 
1552                 if (!cmnd->result &&
1553                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1554                         cmnd->result = (DID_ERROR << 16);
1555 
1556                 scsi_dma_unmap(cmnd);
1557                 cmnd->scsi_done(cmnd);
1558         }
1559 
1560         if (evt->eh_comp)
1561                 complete(evt->eh_comp);
1562 
1563         ibmvfc_free_event(evt);
1564 }
1565 
1566 /**
1567  * ibmvfc_host_chkready - Check if the host can accept commands
1568  * @vhost:       struct ibmvfc host
1569  *
1570  * Returns:
1571  *      1 if host can accept command / 0 if not
1572  **/
1573 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1574 {
1575         int result = 0;
1576 
1577         switch (vhost->state) {
1578         case IBMVFC_LINK_DEAD:
1579         case IBMVFC_HOST_OFFLINE:
1580                 result = DID_NO_CONNECT << 16;
1581                 break;
1582         case IBMVFC_NO_CRQ:
1583         case IBMVFC_INITIALIZING:
1584         case IBMVFC_HALTED:
1585         case IBMVFC_LINK_DOWN:
1586                 result = DID_REQUEUE << 16;
1587                 break;
1588         case IBMVFC_ACTIVE:
1589                 result = 0;
1590                 break;
1591         }
1592 
1593         return result;
1594 }
1595 
1596 /**
1597  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1598  * @cmnd:       struct scsi_cmnd to be executed
1599  * @done:       Callback function to be called when cmnd is completed
1600  *
1601  * Returns:
1602  *      0 on success / other on failure
1603  **/
1604 static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
1605                                void (*done) (struct scsi_cmnd *))
1606 {
1607         struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1608         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1609         struct ibmvfc_cmd *vfc_cmd;
1610         struct ibmvfc_event *evt;
1611         int rc;
1612 
1613         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1614             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1615                 cmnd->result = rc;
1616                 done(cmnd);
1617                 return 0;
1618         }
1619 
1620         cmnd->result = (DID_OK << 16);
1621         evt = ibmvfc_get_event(vhost);
1622         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1623         evt->cmnd = cmnd;
1624         cmnd->scsi_done = done;
1625         vfc_cmd = &evt->iu.cmd;
1626         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1627         vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1628         vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1629         vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1630         vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu));
1631         vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1632         vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata);
1633         vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1634         vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1635         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1636         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1637 
1638         if (cmnd->flags & SCMD_TAGGED) {
1639                 vfc_cmd->task_tag = cpu_to_be64(cmnd->tag);
1640                 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1641         }
1642 
1643         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1644                 return ibmvfc_send_event(evt, vhost, 0);
1645 
1646         ibmvfc_free_event(evt);
1647         if (rc == -ENOMEM)
1648                 return SCSI_MLQUEUE_HOST_BUSY;
1649 
1650         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1651                 scmd_printk(KERN_ERR, cmnd,
1652                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1653 
1654         cmnd->result = DID_ERROR << 16;
1655         done(cmnd);
1656         return 0;
1657 }
1658 
1659 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1660 
1661 /**
1662  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1663  * @evt:        ibmvfc event struct
1664  *
1665  **/
1666 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1667 {
1668         /* copy the response back */
1669         if (evt->sync_iu)
1670                 *evt->sync_iu = *evt->xfer_iu;
1671 
1672         complete(&evt->comp);
1673 }
1674 
1675 /**
1676  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1677  * @evt:        struct ibmvfc_event
1678  *
1679  **/
1680 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1681 {
1682         struct ibmvfc_host *vhost = evt->vhost;
1683 
1684         ibmvfc_free_event(evt);
1685         vhost->aborting_passthru = 0;
1686         dev_info(vhost->dev, "Passthru command cancelled\n");
1687 }
1688 
1689 /**
1690  * ibmvfc_bsg_timeout - Handle a BSG timeout
1691  * @job:        struct bsg_job that timed out
1692  *
1693  * Returns:
1694  *      0 on success / other on failure
1695  **/
1696 static int ibmvfc_bsg_timeout(struct bsg_job *job)
1697 {
1698         struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
1699         unsigned long port_id = (unsigned long)job->dd_data;
1700         struct ibmvfc_event *evt;
1701         struct ibmvfc_tmf *tmf;
1702         unsigned long flags;
1703         int rc;
1704 
1705         ENTER;
1706         spin_lock_irqsave(vhost->host->host_lock, flags);
1707         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1708                 __ibmvfc_reset_host(vhost);
1709                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1710                 return 0;
1711         }
1712 
1713         vhost->aborting_passthru = 1;
1714         evt = ibmvfc_get_event(vhost);
1715         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1716 
1717         tmf = &evt->iu.tmf;
1718         memset(tmf, 0, sizeof(*tmf));
1719         tmf->common.version = cpu_to_be32(1);
1720         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
1721         tmf->common.length = cpu_to_be16(sizeof(*tmf));
1722         tmf->scsi_id = cpu_to_be64(port_id);
1723         tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1724         tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
1725         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1726 
1727         if (rc != 0) {
1728                 vhost->aborting_passthru = 0;
1729                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1730                 rc = -EIO;
1731         } else
1732                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1733                          port_id);
1734 
1735         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1736 
1737         LEAVE;
1738         return rc;
1739 }
1740 
1741 /**
1742  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1743  * @vhost:              struct ibmvfc_host to send command
1744  * @port_id:    port ID to send command
1745  *
1746  * Returns:
1747  *      0 on success / other on failure
1748  **/
1749 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1750 {
1751         struct ibmvfc_port_login *plogi;
1752         struct ibmvfc_target *tgt;
1753         struct ibmvfc_event *evt;
1754         union ibmvfc_iu rsp_iu;
1755         unsigned long flags;
1756         int rc = 0, issue_login = 1;
1757 
1758         ENTER;
1759         spin_lock_irqsave(vhost->host->host_lock, flags);
1760         list_for_each_entry(tgt, &vhost->targets, queue) {
1761                 if (tgt->scsi_id == port_id) {
1762                         issue_login = 0;
1763                         break;
1764                 }
1765         }
1766 
1767         if (!issue_login)
1768                 goto unlock_out;
1769         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1770                 goto unlock_out;
1771 
1772         evt = ibmvfc_get_event(vhost);
1773         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1774         plogi = &evt->iu.plogi;
1775         memset(plogi, 0, sizeof(*plogi));
1776         plogi->common.version = cpu_to_be32(1);
1777         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
1778         plogi->common.length = cpu_to_be16(sizeof(*plogi));
1779         plogi->scsi_id = cpu_to_be64(port_id);
1780         evt->sync_iu = &rsp_iu;
1781         init_completion(&evt->comp);
1782 
1783         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1784         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1785 
1786         if (rc)
1787                 return -EIO;
1788 
1789         wait_for_completion(&evt->comp);
1790 
1791         if (rsp_iu.plogi.common.status)
1792                 rc = -EIO;
1793 
1794         spin_lock_irqsave(vhost->host->host_lock, flags);
1795         ibmvfc_free_event(evt);
1796 unlock_out:
1797         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1798         LEAVE;
1799         return rc;
1800 }
1801 
1802 /**
1803  * ibmvfc_bsg_request - Handle a BSG request
1804  * @job:        struct bsg_job to be executed
1805  *
1806  * Returns:
1807  *      0 on success / other on failure
1808  **/
1809 static int ibmvfc_bsg_request(struct bsg_job *job)
1810 {
1811         struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
1812         struct fc_rport *rport = fc_bsg_to_rport(job);
1813         struct ibmvfc_passthru_mad *mad;
1814         struct ibmvfc_event *evt;
1815         union ibmvfc_iu rsp_iu;
1816         unsigned long flags, port_id = -1;
1817         struct fc_bsg_request *bsg_request = job->request;
1818         struct fc_bsg_reply *bsg_reply = job->reply;
1819         unsigned int code = bsg_request->msgcode;
1820         int rc = 0, req_seg, rsp_seg, issue_login = 0;
1821         u32 fc_flags, rsp_len;
1822 
1823         ENTER;
1824         bsg_reply->reply_payload_rcv_len = 0;
1825         if (rport)
1826                 port_id = rport->port_id;
1827 
1828         switch (code) {
1829         case FC_BSG_HST_ELS_NOLOGIN:
1830                 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
1831                         (bsg_request->rqst_data.h_els.port_id[1] << 8) |
1832                         bsg_request->rqst_data.h_els.port_id[2];
1833                 /* fall through */
1834         case FC_BSG_RPT_ELS:
1835                 fc_flags = IBMVFC_FC_ELS;
1836                 break;
1837         case FC_BSG_HST_CT:
1838                 issue_login = 1;
1839                 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
1840                         (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
1841                         bsg_request->rqst_data.h_ct.port_id[2];
1842                 /* fall through */
1843         case FC_BSG_RPT_CT:
1844                 fc_flags = IBMVFC_FC_CT_IU;
1845                 break;
1846         default:
1847                 return -ENOTSUPP;
1848         }
1849 
1850         if (port_id == -1)
1851                 return -EINVAL;
1852         if (!mutex_trylock(&vhost->passthru_mutex))
1853                 return -EBUSY;
1854 
1855         job->dd_data = (void *)port_id;
1856         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1857                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1858 
1859         if (!req_seg) {
1860                 mutex_unlock(&vhost->passthru_mutex);
1861                 return -ENOMEM;
1862         }
1863 
1864         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1865                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1866 
1867         if (!rsp_seg) {
1868                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1869                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1870                 mutex_unlock(&vhost->passthru_mutex);
1871                 return -ENOMEM;
1872         }
1873 
1874         if (req_seg > 1 || rsp_seg > 1) {
1875                 rc = -EINVAL;
1876                 goto out;
1877         }
1878 
1879         if (issue_login)
1880                 rc = ibmvfc_bsg_plogi(vhost, port_id);
1881 
1882         spin_lock_irqsave(vhost->host->host_lock, flags);
1883 
1884         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1885             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1886                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1887                 goto out;
1888         }
1889 
1890         evt = ibmvfc_get_event(vhost);
1891         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1892         mad = &evt->iu.passthru;
1893 
1894         memset(mad, 0, sizeof(*mad));
1895         mad->common.version = cpu_to_be32(1);
1896         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
1897         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
1898 
1899         mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
1900                 offsetof(struct ibmvfc_passthru_mad, iu));
1901         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
1902 
1903         mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
1904         mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
1905         mad->iu.flags = cpu_to_be32(fc_flags);
1906         mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1907 
1908         mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
1909         mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
1910         mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
1911         mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
1912         mad->iu.scsi_id = cpu_to_be64(port_id);
1913         mad->iu.tag = cpu_to_be64((u64)evt);
1914         rsp_len = be32_to_cpu(mad->iu.rsp.len);
1915 
1916         evt->sync_iu = &rsp_iu;
1917         init_completion(&evt->comp);
1918         rc = ibmvfc_send_event(evt, vhost, 0);
1919         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1920 
1921         if (rc) {
1922                 rc = -EIO;
1923                 goto out;
1924         }
1925 
1926         wait_for_completion(&evt->comp);
1927 
1928         if (rsp_iu.passthru.common.status)
1929                 rc = -EIO;
1930         else
1931                 bsg_reply->reply_payload_rcv_len = rsp_len;
1932 
1933         spin_lock_irqsave(vhost->host->host_lock, flags);
1934         ibmvfc_free_event(evt);
1935         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1936         bsg_reply->result = rc;
1937         bsg_job_done(job, bsg_reply->result,
1938                        bsg_reply->reply_payload_rcv_len);
1939         rc = 0;
1940 out:
1941         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1942                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
1943         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1944                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1945         mutex_unlock(&vhost->passthru_mutex);
1946         LEAVE;
1947         return rc;
1948 }
1949 
1950 /**
1951  * ibmvfc_reset_device - Reset the device with the specified reset type
1952  * @sdev:       scsi device to reset
1953  * @type:       reset type
1954  * @desc:       reset type description for log messages
1955  *
1956  * Returns:
1957  *      0 on success / other on failure
1958  **/
1959 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1960 {
1961         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1962         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1963         struct ibmvfc_cmd *tmf;
1964         struct ibmvfc_event *evt = NULL;
1965         union ibmvfc_iu rsp_iu;
1966         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1967         int rsp_rc = -EBUSY;
1968         unsigned long flags;
1969         int rsp_code = 0;
1970 
1971         spin_lock_irqsave(vhost->host->host_lock, flags);
1972         if (vhost->state == IBMVFC_ACTIVE) {
1973                 evt = ibmvfc_get_event(vhost);
1974                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1975 
1976                 tmf = &evt->iu.cmd;
1977                 memset(tmf, 0, sizeof(*tmf));
1978                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1979                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
1980                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1981                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
1982                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
1983                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1984                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
1985                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1986                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
1987                 tmf->iu.tmf_flags = type;
1988                 evt->sync_iu = &rsp_iu;
1989 
1990                 init_completion(&evt->comp);
1991                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1992         }
1993         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1994 
1995         if (rsp_rc != 0) {
1996                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
1997                             desc, rsp_rc);
1998                 return -EIO;
1999         }
2000 
2001         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2002         wait_for_completion(&evt->comp);
2003 
2004         if (rsp_iu.cmd.status)
2005                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2006 
2007         if (rsp_code) {
2008                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2009                         rsp_code = fc_rsp->data.info.rsp_code;
2010 
2011                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2012                             "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2013                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2014                             be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2015                             fc_rsp->scsi_status);
2016                 rsp_rc = -EIO;
2017         } else
2018                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2019 
2020         spin_lock_irqsave(vhost->host->host_lock, flags);
2021         ibmvfc_free_event(evt);
2022         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2023         return rsp_rc;
2024 }
2025 
2026 /**
2027  * ibmvfc_match_rport - Match function for specified remote port
2028  * @evt:        ibmvfc event struct
2029  * @device:     device to match (rport)
2030  *
2031  * Returns:
2032  *      1 if event matches rport / 0 if event does not match rport
2033  **/
2034 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2035 {
2036         struct fc_rport *cmd_rport;
2037 
2038         if (evt->cmnd) {
2039                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2040                 if (cmd_rport == rport)
2041                         return 1;
2042         }
2043         return 0;
2044 }
2045 
2046 /**
2047  * ibmvfc_match_target - Match function for specified target
2048  * @evt:        ibmvfc event struct
2049  * @device:     device to match (starget)
2050  *
2051  * Returns:
2052  *      1 if event matches starget / 0 if event does not match starget
2053  **/
2054 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2055 {
2056         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2057                 return 1;
2058         return 0;
2059 }
2060 
2061 /**
2062  * ibmvfc_match_lun - Match function for specified LUN
2063  * @evt:        ibmvfc event struct
2064  * @device:     device to match (sdev)
2065  *
2066  * Returns:
2067  *      1 if event matches sdev / 0 if event does not match sdev
2068  **/
2069 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2070 {
2071         if (evt->cmnd && evt->cmnd->device == device)
2072                 return 1;
2073         return 0;
2074 }
2075 
2076 /**
2077  * ibmvfc_wait_for_ops - Wait for ops to complete
2078  * @vhost:      ibmvfc host struct
2079  * @device:     device to match (starget or sdev)
2080  * @match:      match function
2081  *
2082  * Returns:
2083  *      SUCCESS / FAILED
2084  **/
2085 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2086                                int (*match) (struct ibmvfc_event *, void *))
2087 {
2088         struct ibmvfc_event *evt;
2089         DECLARE_COMPLETION_ONSTACK(comp);
2090         int wait;
2091         unsigned long flags;
2092         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2093 
2094         ENTER;
2095         do {
2096                 wait = 0;
2097                 spin_lock_irqsave(vhost->host->host_lock, flags);
2098                 list_for_each_entry(evt, &vhost->sent, queue) {
2099                         if (match(evt, device)) {
2100                                 evt->eh_comp = &comp;
2101                                 wait++;
2102                         }
2103                 }
2104                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2105 
2106                 if (wait) {
2107                         timeout = wait_for_completion_timeout(&comp, timeout);
2108 
2109                         if (!timeout) {
2110                                 wait = 0;
2111                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2112                                 list_for_each_entry(evt, &vhost->sent, queue) {
2113                                         if (match(evt, device)) {
2114                                                 evt->eh_comp = NULL;
2115                                                 wait++;
2116                                         }
2117                                 }
2118                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2119                                 if (wait)
2120                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2121                                 LEAVE;
2122                                 return wait ? FAILED : SUCCESS;
2123                         }
2124                 }
2125         } while (wait);
2126 
2127         LEAVE;
2128         return SUCCESS;
2129 }
2130 
2131 /**
2132  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2133  * @sdev:       scsi device to cancel commands
2134  * @type:       type of error recovery being performed
2135  *
2136  * This sends a cancel to the VIOS for the specified device. This does
2137  * NOT send any abort to the actual device. That must be done separately.
2138  *
2139  * Returns:
2140  *      0 on success / other on failure
2141  **/
2142 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2143 {
2144         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2145         struct scsi_target *starget = scsi_target(sdev);
2146         struct fc_rport *rport = starget_to_rport(starget);
2147         struct ibmvfc_tmf *tmf;
2148         struct ibmvfc_event *evt, *found_evt;
2149         union ibmvfc_iu rsp;
2150         int rsp_rc = -EBUSY;
2151         unsigned long flags;
2152         u16 status;
2153 
2154         ENTER;
2155         spin_lock_irqsave(vhost->host->host_lock, flags);
2156         found_evt = NULL;
2157         list_for_each_entry(evt, &vhost->sent, queue) {
2158                 if (evt->cmnd && evt->cmnd->device == sdev) {
2159                         found_evt = evt;
2160                         break;
2161                 }
2162         }
2163 
2164         if (!found_evt) {
2165                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2166                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2167                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2168                 return 0;
2169         }
2170 
2171         if (vhost->logged_in) {
2172                 evt = ibmvfc_get_event(vhost);
2173                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2174 
2175                 tmf = &evt->iu.tmf;
2176                 memset(tmf, 0, sizeof(*tmf));
2177                 tmf->common.version = cpu_to_be32(1);
2178                 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2179                 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2180                 tmf->scsi_id = cpu_to_be64(rport->port_id);
2181                 int_to_scsilun(sdev->lun, &tmf->lun);
2182                 if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS))
2183                         type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2184                 if (vhost->state == IBMVFC_ACTIVE)
2185                         tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2186                 else
2187                         tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2188                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2189                 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2190 
2191                 evt->sync_iu = &rsp;
2192                 init_completion(&evt->comp);
2193                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2194         }
2195 
2196         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2197 
2198         if (rsp_rc != 0) {
2199                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2200                 /* If failure is received, the host adapter is most likely going
2201                  through reset, return success so the caller will wait for the command
2202                  being cancelled to get returned */
2203                 return 0;
2204         }
2205 
2206         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2207 
2208         wait_for_completion(&evt->comp);
2209         status = be16_to_cpu(rsp.mad_common.status);
2210         spin_lock_irqsave(vhost->host->host_lock, flags);
2211         ibmvfc_free_event(evt);
2212         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2213 
2214         if (status != IBMVFC_MAD_SUCCESS) {
2215                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2216                 switch (status) {
2217                 case IBMVFC_MAD_DRIVER_FAILED:
2218                 case IBMVFC_MAD_CRQ_ERROR:
2219                         /* Host adapter most likely going through reset, return success to
2220                          the caller will wait for the command being cancelled to get returned */
2221                         return 0;
2222                 default:
2223                         return -EIO;
2224                 };
2225         }
2226 
2227         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2228         return 0;
2229 }
2230 
2231 /**
2232  * ibmvfc_match_key - Match function for specified cancel key
2233  * @evt:        ibmvfc event struct
2234  * @key:        cancel key to match
2235  *
2236  * Returns:
2237  *      1 if event matches key / 0 if event does not match key
2238  **/
2239 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2240 {
2241         unsigned long cancel_key = (unsigned long)key;
2242 
2243         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2244             be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2245                 return 1;
2246         return 0;
2247 }
2248 
2249 /**
2250  * ibmvfc_match_evt - Match function for specified event
2251  * @evt:        ibmvfc event struct
2252  * @match:      event to match
2253  *
2254  * Returns:
2255  *      1 if event matches key / 0 if event does not match key
2256  **/
2257 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2258 {
2259         if (evt == match)
2260                 return 1;
2261         return 0;
2262 }
2263 
2264 /**
2265  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2266  * @sdev:       scsi device to abort commands
2267  *
2268  * This sends an Abort Task Set to the VIOS for the specified device. This does
2269  * NOT send any cancel to the VIOS. That must be done separately.
2270  *
2271  * Returns:
2272  *      0 on success / other on failure
2273  **/
2274 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2275 {
2276         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2277         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2278         struct ibmvfc_cmd *tmf;
2279         struct ibmvfc_event *evt, *found_evt;
2280         union ibmvfc_iu rsp_iu;
2281         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2282         int rc, rsp_rc = -EBUSY;
2283         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2284         int rsp_code = 0;
2285 
2286         spin_lock_irqsave(vhost->host->host_lock, flags);
2287         found_evt = NULL;
2288         list_for_each_entry(evt, &vhost->sent, queue) {
2289                 if (evt->cmnd && evt->cmnd->device == sdev) {
2290                         found_evt = evt;
2291                         break;
2292                 }
2293         }
2294 
2295         if (!found_evt) {
2296                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2297                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2298                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2299                 return 0;
2300         }
2301 
2302         if (vhost->state == IBMVFC_ACTIVE) {
2303                 evt = ibmvfc_get_event(vhost);
2304                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2305 
2306                 tmf = &evt->iu.cmd;
2307                 memset(tmf, 0, sizeof(*tmf));
2308                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
2309                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
2310                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
2311                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
2312                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
2313                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2314                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
2315                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2316                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2317                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2318                 evt->sync_iu = &rsp_iu;
2319 
2320                 init_completion(&evt->comp);
2321                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2322         }
2323 
2324         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2325 
2326         if (rsp_rc != 0) {
2327                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2328                 return -EIO;
2329         }
2330 
2331         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2332         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2333 
2334         if (!timeout) {
2335                 rc = ibmvfc_cancel_all(sdev, 0);
2336                 if (!rc) {
2337                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2338                         if (rc == SUCCESS)
2339                                 rc = 0;
2340                 }
2341 
2342                 if (rc) {
2343                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2344                         ibmvfc_reset_host(vhost);
2345                         rsp_rc = -EIO;
2346                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2347 
2348                         if (rc == SUCCESS)
2349                                 rsp_rc = 0;
2350 
2351                         rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2352                         if (rc != SUCCESS) {
2353                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2354                                 ibmvfc_hard_reset_host(vhost);
2355                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2356                                 rsp_rc = 0;
2357                         }
2358 
2359                         goto out;
2360                 }
2361         }
2362 
2363         if (rsp_iu.cmd.status)
2364                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2365 
2366         if (rsp_code) {
2367                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2368                         rsp_code = fc_rsp->data.info.rsp_code;
2369 
2370                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2371                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2372                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2373                             be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2374                             fc_rsp->scsi_status);
2375                 rsp_rc = -EIO;
2376         } else
2377                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2378 
2379 out:
2380         spin_lock_irqsave(vhost->host->host_lock, flags);
2381         ibmvfc_free_event(evt);
2382         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2383         return rsp_rc;
2384 }
2385 
2386 /**
2387  * ibmvfc_eh_abort_handler - Abort a command
2388  * @cmd:        scsi command to abort
2389  *
2390  * Returns:
2391  *      SUCCESS / FAST_IO_FAIL / FAILED
2392  **/
2393 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2394 {
2395         struct scsi_device *sdev = cmd->device;
2396         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2397         int cancel_rc, block_rc;
2398         int rc = FAILED;
2399 
2400         ENTER;
2401         block_rc = fc_block_scsi_eh(cmd);
2402         ibmvfc_wait_while_resetting(vhost);
2403         if (block_rc != FAST_IO_FAIL) {
2404                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2405                 ibmvfc_abort_task_set(sdev);
2406         } else
2407                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2408 
2409         if (!cancel_rc)
2410                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2411 
2412         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2413                 rc = FAST_IO_FAIL;
2414 
2415         LEAVE;
2416         return rc;
2417 }
2418 
2419 /**
2420  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2421  * @cmd:        scsi command struct
2422  *
2423  * Returns:
2424  *      SUCCESS / FAST_IO_FAIL / FAILED
2425  **/
2426 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2427 {
2428         struct scsi_device *sdev = cmd->device;
2429         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2430         int cancel_rc, block_rc, reset_rc = 0;
2431         int rc = FAILED;
2432 
2433         ENTER;
2434         block_rc = fc_block_scsi_eh(cmd);
2435         ibmvfc_wait_while_resetting(vhost);
2436         if (block_rc != FAST_IO_FAIL) {
2437                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2438                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2439         } else
2440                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2441 
2442         if (!cancel_rc && !reset_rc)
2443                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2444 
2445         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2446                 rc = FAST_IO_FAIL;
2447 
2448         LEAVE;
2449         return rc;
2450 }
2451 
2452 /**
2453  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2454  * @sdev:       scsi device struct
2455  * @data:       return code
2456  *
2457  **/
2458 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2459 {
2460         unsigned long *rc = data;
2461         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2462 }
2463 
2464 /**
2465  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2466  * @sdev:       scsi device struct
2467  * @data:       return code
2468  *
2469  **/
2470 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2471 {
2472         unsigned long *rc = data;
2473         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2474 }
2475 
2476 /**
2477  * ibmvfc_eh_target_reset_handler - Reset the target
2478  * @cmd:        scsi command struct
2479  *
2480  * Returns:
2481  *      SUCCESS / FAST_IO_FAIL / FAILED
2482  **/
2483 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2484 {
2485         struct scsi_device *sdev = cmd->device;
2486         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2487         struct scsi_target *starget = scsi_target(sdev);
2488         int block_rc;
2489         int reset_rc = 0;
2490         int rc = FAILED;
2491         unsigned long cancel_rc = 0;
2492 
2493         ENTER;
2494         block_rc = fc_block_scsi_eh(cmd);
2495         ibmvfc_wait_while_resetting(vhost);
2496         if (block_rc != FAST_IO_FAIL) {
2497                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2498                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2499         } else
2500                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2501 
2502         if (!cancel_rc && !reset_rc)
2503                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2504 
2505         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2506                 rc = FAST_IO_FAIL;
2507 
2508         LEAVE;
2509         return rc;
2510 }
2511 
2512 /**
2513  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2514  * @cmd:        struct scsi_cmnd having problems
2515  *
2516  **/
2517 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2518 {
2519         int rc;
2520         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2521 
2522         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2523         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2524 
2525         return rc ? FAILED : SUCCESS;
2526 }
2527 
2528 /**
2529  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2530  * @rport:              rport struct
2531  *
2532  * Return value:
2533  *      none
2534  **/
2535 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2536 {
2537         struct Scsi_Host *shost = rport_to_shost(rport);
2538         struct ibmvfc_host *vhost = shost_priv(shost);
2539         struct fc_rport *dev_rport;
2540         struct scsi_device *sdev;
2541         unsigned long rc;
2542 
2543         ENTER;
2544         shost_for_each_device(sdev, shost) {
2545                 dev_rport = starget_to_rport(scsi_target(sdev));
2546                 if (dev_rport != rport)
2547                         continue;
2548                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2549         }
2550 
2551         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2552 
2553         if (rc == FAILED)
2554                 ibmvfc_issue_fc_host_lip(shost);
2555         LEAVE;
2556 }
2557 
2558 static const struct ibmvfc_async_desc ae_desc [] = {
2559         { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2560         { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2561         { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2562         { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2563         { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2564         { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
2565         { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
2566         { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
2567         { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
2568         { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
2569         { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
2570         { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
2571         { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2572 };
2573 
2574 static const struct ibmvfc_async_desc unknown_ae = {
2575         "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2576 };
2577 
2578 /**
2579  * ibmvfc_get_ae_desc - Get text description for async event
2580  * @ae: async event
2581  *
2582  **/
2583 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2584 {
2585         int i;
2586 
2587         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2588                 if (ae_desc[i].ae == ae)
2589                         return &ae_desc[i];
2590 
2591         return &unknown_ae;
2592 }
2593 
2594 static const struct {
2595         enum ibmvfc_ae_link_state state;
2596         const char *desc;
2597 } link_desc [] = {
2598         { IBMVFC_AE_LS_LINK_UP,         " link up" },
2599         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
2600         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
2601         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
2602 };
2603 
2604 /**
2605  * ibmvfc_get_link_state - Get text description for link state
2606  * @state:      link state
2607  *
2608  **/
2609 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2610 {
2611         int i;
2612 
2613         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2614                 if (link_desc[i].state == state)
2615                         return link_desc[i].desc;
2616 
2617         return "";
2618 }
2619 
2620 /**
2621  * ibmvfc_handle_async - Handle an async event from the adapter
2622  * @crq:        crq to process
2623  * @vhost:      ibmvfc host struct
2624  *
2625  **/
2626 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2627                                 struct ibmvfc_host *vhost)
2628 {
2629         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
2630         struct ibmvfc_target *tgt;
2631 
2632         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2633                    " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
2634                    be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
2635                    ibmvfc_get_link_state(crq->link_state));
2636 
2637         switch (be64_to_cpu(crq->event)) {
2638         case IBMVFC_AE_RESUME:
2639                 switch (crq->link_state) {
2640                 case IBMVFC_AE_LS_LINK_DOWN:
2641                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2642                         break;
2643                 case IBMVFC_AE_LS_LINK_DEAD:
2644                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2645                         break;
2646                 case IBMVFC_AE_LS_LINK_UP:
2647                 case IBMVFC_AE_LS_LINK_BOUNCED:
2648                 default:
2649                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2650                         vhost->delay_init = 1;
2651                         __ibmvfc_reset_host(vhost);
2652                         break;
2653                 }
2654 
2655                 break;
2656         case IBMVFC_AE_LINK_UP:
2657                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2658                 vhost->delay_init = 1;
2659                 __ibmvfc_reset_host(vhost);
2660                 break;
2661         case IBMVFC_AE_SCN_FABRIC:
2662         case IBMVFC_AE_SCN_DOMAIN:
2663                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2664                 if (vhost->state < IBMVFC_HALTED) {
2665                         vhost->delay_init = 1;
2666                         __ibmvfc_reset_host(vhost);
2667                 }
2668                 break;
2669         case IBMVFC_AE_SCN_NPORT:
2670         case IBMVFC_AE_SCN_GROUP:
2671                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2672                 ibmvfc_reinit_host(vhost);
2673                 break;
2674         case IBMVFC_AE_ELS_LOGO:
2675         case IBMVFC_AE_ELS_PRLO:
2676         case IBMVFC_AE_ELS_PLOGI:
2677                 list_for_each_entry(tgt, &vhost->targets, queue) {
2678                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2679                                 break;
2680                         if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
2681                                 continue;
2682                         if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
2683                                 continue;
2684                         if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
2685                                 continue;
2686                         if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
2687                                 tgt->logo_rcvd = 1;
2688                         if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
2689                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2690                                 ibmvfc_reinit_host(vhost);
2691                         }
2692                 }
2693                 break;
2694         case IBMVFC_AE_LINK_DOWN:
2695         case IBMVFC_AE_ADAPTER_FAILED:
2696                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2697                 break;
2698         case IBMVFC_AE_LINK_DEAD:
2699                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2700                 break;
2701         case IBMVFC_AE_HALT:
2702                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2703                 break;
2704         default:
2705                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2706                 break;
2707         }
2708 }
2709 
2710 /**
2711  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2712  * @crq:        Command/Response queue
2713  * @vhost:      ibmvfc host struct
2714  *
2715  **/
2716 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2717 {
2718         long rc;
2719         struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
2720 
2721         switch (crq->valid) {
2722         case IBMVFC_CRQ_INIT_RSP:
2723                 switch (crq->format) {
2724                 case IBMVFC_CRQ_INIT:
2725                         dev_info(vhost->dev, "Partner initialized\n");
2726                         /* Send back a response */
2727                         rc = ibmvfc_send_crq_init_complete(vhost);
2728                         if (rc == 0)
2729                                 ibmvfc_init_host(vhost);
2730                         else
2731                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2732                         break;
2733                 case IBMVFC_CRQ_INIT_COMPLETE:
2734                         dev_info(vhost->dev, "Partner initialization complete\n");
2735                         ibmvfc_init_host(vhost);
2736                         break;
2737                 default:
2738                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2739                 }
2740                 return;
2741         case IBMVFC_CRQ_XPORT_EVENT:
2742                 vhost->state = IBMVFC_NO_CRQ;
2743                 vhost->logged_in = 0;
2744                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2745                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2746                         /* We need to re-setup the interpartition connection */
2747                         dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
2748                         vhost->client_migrated = 1;
2749                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2750                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2751                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2752                 } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
2753                         dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
2754                         ibmvfc_purge_requests(vhost, DID_ERROR);
2755                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2756                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2757                 } else {
2758                         dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
2759                 }
2760                 return;
2761         case IBMVFC_CRQ_CMD_RSP:
2762                 break;
2763         default:
2764                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2765                 return;
2766         }
2767 
2768         if (crq->format == IBMVFC_ASYNC_EVENT)
2769                 return;
2770 
2771         /* The only kind of payload CRQs we should get are responses to
2772          * things we send. Make sure this response is to something we
2773          * actually sent
2774          */
2775         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2776                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2777                         crq->ioba);
2778                 return;
2779         }
2780 
2781         if (unlikely(atomic_read(&evt->free))) {
2782                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2783                         crq->ioba);
2784                 return;
2785         }
2786 
2787         del_timer(&evt->timer);
2788         list_del(&evt->queue);
2789         ibmvfc_trc_end(evt);
2790         evt->done(evt);
2791 }
2792 
2793 /**
2794  * ibmvfc_scan_finished - Check if the device scan is done.
2795  * @shost:      scsi host struct
2796  * @time:       current elapsed time
2797  *
2798  * Returns:
2799  *      0 if scan is not done / 1 if scan is done
2800  **/
2801 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2802 {
2803         unsigned long flags;
2804         struct ibmvfc_host *vhost = shost_priv(shost);
2805         int done = 0;
2806 
2807         spin_lock_irqsave(shost->host_lock, flags);
2808         if (time >= (init_timeout * HZ)) {
2809                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2810                          "continuing initialization\n", init_timeout);
2811                 done = 1;
2812         }
2813 
2814         if (vhost->scan_complete)
2815                 done = 1;
2816         spin_unlock_irqrestore(shost->host_lock, flags);
2817         return done;
2818 }
2819 
2820 /**
2821  * ibmvfc_slave_alloc - Setup the device's task set value
2822  * @sdev:       struct scsi_device device to configure
2823  *
2824  * Set the device's task set value so that error handling works as
2825  * expected.
2826  *
2827  * Returns:
2828  *      0 on success / -ENXIO if device does not exist
2829  **/
2830 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2831 {
2832         struct Scsi_Host *shost = sdev->host;
2833         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2834         struct ibmvfc_host *vhost = shost_priv(shost);
2835         unsigned long flags = 0;
2836 
2837         if (!rport || fc_remote_port_chkready(rport))
2838                 return -ENXIO;
2839 
2840         spin_lock_irqsave(shost->host_lock, flags);
2841         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2842         spin_unlock_irqrestore(shost->host_lock, flags);
2843         return 0;
2844 }
2845 
2846 /**
2847  * ibmvfc_target_alloc - Setup the target's task set value
2848  * @starget:    struct scsi_target
2849  *
2850  * Set the target's task set value so that error handling works as
2851  * expected.
2852  *
2853  * Returns:
2854  *      0 on success / -ENXIO if device does not exist
2855  **/
2856 static int ibmvfc_target_alloc(struct scsi_target *starget)
2857 {
2858         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2859         struct ibmvfc_host *vhost = shost_priv(shost);
2860         unsigned long flags = 0;
2861 
2862         spin_lock_irqsave(shost->host_lock, flags);
2863         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2864         spin_unlock_irqrestore(shost->host_lock, flags);
2865         return 0;
2866 }
2867 
2868 /**
2869  * ibmvfc_slave_configure - Configure the device
2870  * @sdev:       struct scsi_device device to configure
2871  *
2872  * Enable allow_restart for a device if it is a disk. Adjust the
2873  * queue_depth here also.
2874  *
2875  * Returns:
2876  *      0
2877  **/
2878 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2879 {
2880         struct Scsi_Host *shost = sdev->host;
2881         unsigned long flags = 0;
2882 
2883         spin_lock_irqsave(shost->host_lock, flags);
2884         if (sdev->type == TYPE_DISK)
2885                 sdev->allow_restart = 1;
2886         spin_unlock_irqrestore(shost->host_lock, flags);
2887         return 0;
2888 }
2889 
2890 /**
2891  * ibmvfc_change_queue_depth - Change the device's queue depth
2892  * @sdev:       scsi device struct
2893  * @qdepth:     depth to set
2894  * @reason:     calling context
2895  *
2896  * Return value:
2897  *      actual depth set
2898  **/
2899 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2900 {
2901         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2902                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2903 
2904         return scsi_change_queue_depth(sdev, qdepth);
2905 }
2906 
2907 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2908                                                  struct device_attribute *attr, char *buf)
2909 {
2910         struct Scsi_Host *shost = class_to_shost(dev);
2911         struct ibmvfc_host *vhost = shost_priv(shost);
2912 
2913         return snprintf(buf, PAGE_SIZE, "%s\n",
2914                         vhost->login_buf->resp.partition_name);
2915 }
2916 
2917 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2918                                             struct device_attribute *attr, char *buf)
2919 {
2920         struct Scsi_Host *shost = class_to_shost(dev);
2921         struct ibmvfc_host *vhost = shost_priv(shost);
2922 
2923         return snprintf(buf, PAGE_SIZE, "%s\n",
2924                         vhost->login_buf->resp.device_name);
2925 }
2926 
2927 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2928                                          struct device_attribute *attr, char *buf)
2929 {
2930         struct Scsi_Host *shost = class_to_shost(dev);
2931         struct ibmvfc_host *vhost = shost_priv(shost);
2932 
2933         return snprintf(buf, PAGE_SIZE, "%s\n",
2934                         vhost->login_buf->resp.port_loc_code);
2935 }
2936 
2937 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2938                                          struct device_attribute *attr, char *buf)
2939 {
2940         struct Scsi_Host *shost = class_to_shost(dev);
2941         struct ibmvfc_host *vhost = shost_priv(shost);
2942 
2943         return snprintf(buf, PAGE_SIZE, "%s\n",
2944                         vhost->login_buf->resp.drc_name);
2945 }
2946 
2947 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2948                                              struct device_attribute *attr, char *buf)
2949 {
2950         struct Scsi_Host *shost = class_to_shost(dev);
2951         struct ibmvfc_host *vhost = shost_priv(shost);
2952         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2953 }
2954 
2955 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2956                                              struct device_attribute *attr, char *buf)
2957 {
2958         struct Scsi_Host *shost = class_to_shost(dev);
2959         struct ibmvfc_host *vhost = shost_priv(shost);
2960         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2961 }
2962 
2963 /**
2964  * ibmvfc_show_log_level - Show the adapter's error logging level
2965  * @dev:        class device struct
2966  * @buf:        buffer
2967  *
2968  * Return value:
2969  *      number of bytes printed to buffer
2970  **/
2971 static ssize_t ibmvfc_show_log_level(struct device *dev,
2972                                      struct device_attribute *attr, char *buf)
2973 {
2974         struct Scsi_Host *shost = class_to_shost(dev);
2975         struct ibmvfc_host *vhost = shost_priv(shost);
2976         unsigned long flags = 0;
2977         int len;
2978 
2979         spin_lock_irqsave(shost->host_lock, flags);
2980         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2981         spin_unlock_irqrestore(shost->host_lock, flags);
2982         return len;
2983 }
2984 
2985 /**
2986  * ibmvfc_store_log_level - Change the adapter's error logging level
2987  * @dev:        class device struct
2988  * @buf:        buffer
2989  *
2990  * Return value:
2991  *      number of bytes printed to buffer
2992  **/
2993 static ssize_t ibmvfc_store_log_level(struct device *dev,
2994                                       struct device_attribute *attr,
2995                                       const char *buf, size_t count)
2996 {
2997         struct Scsi_Host *shost = class_to_shost(dev);
2998         struct ibmvfc_host *vhost = shost_priv(shost);
2999         unsigned long flags = 0;
3000 
3001         spin_lock_irqsave(shost->host_lock, flags);
3002         vhost->log_level = simple_strtoul(buf, NULL, 10);
3003         spin_unlock_irqrestore(shost->host_lock, flags);
3004         return strlen(buf);
3005 }
3006 
3007 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3008 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3009 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3010 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3011 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3012 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3013 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3014                    ibmvfc_show_log_level, ibmvfc_store_log_level);
3015 
3016 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3017 /**
3018  * ibmvfc_read_trace - Dump the adapter trace
3019  * @filp:               open sysfs file
3020  * @kobj:               kobject struct
3021  * @bin_attr:   bin_attribute struct
3022  * @buf:                buffer
3023  * @off:                offset
3024  * @count:              buffer size
3025  *
3026  * Return value:
3027  *      number of bytes printed to buffer
3028  **/
3029 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3030                                  struct bin_attribute *bin_attr,
3031                                  char *buf, loff_t off, size_t count)
3032 {
3033         struct device *dev = container_of(kobj, struct device, kobj);
3034         struct Scsi_Host *shost = class_to_shost(dev);
3035         struct ibmvfc_host *vhost = shost_priv(shost);
3036         unsigned long flags = 0;
3037         int size = IBMVFC_TRACE_SIZE;
3038         char *src = (char *)vhost->trace;
3039 
3040         if (off > size)
3041                 return 0;
3042         if (off + count > size) {
3043                 size -= off;
3044                 count = size;
3045         }
3046 
3047         spin_lock_irqsave(shost->host_lock, flags);
3048         memcpy(buf, &src[off], count);
3049         spin_unlock_irqrestore(shost->host_lock, flags);
3050         return count;
3051 }
3052 
3053 static struct bin_attribute ibmvfc_trace_attr = {
3054         .attr = {
3055                 .name = "trace",
3056                 .mode = S_IRUGO,
3057         },
3058         .size = 0,
3059         .read = ibmvfc_read_trace,
3060 };
3061 #endif
3062 
3063 static struct device_attribute *ibmvfc_attrs[] = {
3064         &dev_attr_partition_name,
3065         &dev_attr_device_name,
3066         &dev_attr_port_loc_code,
3067         &dev_attr_drc_name,
3068         &dev_attr_npiv_version,
3069         &dev_attr_capabilities,
3070         &dev_attr_log_level,
3071         NULL
3072 };
3073 
3074 static struct scsi_host_template driver_template = {
3075         .module = THIS_MODULE,
3076         .name = "IBM POWER Virtual FC Adapter",
3077         .proc_name = IBMVFC_NAME,
3078         .queuecommand = ibmvfc_queuecommand,
3079         .eh_timed_out = fc_eh_timed_out,
3080         .eh_abort_handler = ibmvfc_eh_abort_handler,
3081         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3082         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3083         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3084         .slave_alloc = ibmvfc_slave_alloc,
3085         .slave_configure = ibmvfc_slave_configure,
3086         .target_alloc = ibmvfc_target_alloc,
3087         .scan_finished = ibmvfc_scan_finished,
3088         .change_queue_depth = ibmvfc_change_queue_depth,
3089         .cmd_per_lun = 16,
3090         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3091         .this_id = -1,
3092         .sg_tablesize = SG_ALL,
3093         .max_sectors = IBMVFC_MAX_SECTORS,
3094         .shost_attrs = ibmvfc_attrs,
3095         .track_queue_depth = 1,
3096 };
3097 
3098 /**
3099  * ibmvfc_next_async_crq - Returns the next entry in async queue
3100  * @vhost:      ibmvfc host struct
3101  *
3102  * Returns:
3103  *      Pointer to next entry in queue / NULL if empty
3104  **/
3105 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3106 {
3107         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3108         struct ibmvfc_async_crq *crq;
3109 
3110         crq = &async_crq->msgs[async_crq->cur];
3111         if (crq->valid & 0x80) {
3112                 if (++async_crq->cur == async_crq->size)
3113                         async_crq->cur = 0;
3114                 rmb();
3115         } else
3116                 crq = NULL;
3117 
3118         return crq;
3119 }
3120 
3121 /**
3122  * ibmvfc_next_crq - Returns the next entry in message queue
3123  * @vhost:      ibmvfc host struct
3124  *
3125  * Returns:
3126  *      Pointer to next entry in queue / NULL if empty
3127  **/
3128 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3129 {
3130         struct ibmvfc_crq_queue *queue = &vhost->crq;
3131         struct ibmvfc_crq *crq;
3132 
3133         crq = &queue->msgs[queue->cur];
3134         if (crq->valid & 0x80) {
3135                 if (++queue->cur == queue->size)
3136                         queue->cur = 0;
3137                 rmb();
3138         } else
3139                 crq = NULL;
3140 
3141         return crq;
3142 }
3143 
3144 /**
3145  * ibmvfc_interrupt - Interrupt handler
3146  * @irq:                number of irq to handle, not used
3147  * @dev_instance: ibmvfc_host that received interrupt
3148  *
3149  * Returns:
3150  *      IRQ_HANDLED
3151  **/
3152 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3153 {
3154         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3155         unsigned long flags;
3156 
3157         spin_lock_irqsave(vhost->host->host_lock, flags);
3158         vio_disable_interrupts(to_vio_dev(vhost->dev));
3159         tasklet_schedule(&vhost->tasklet);
3160         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3161         return IRQ_HANDLED;
3162 }
3163 
3164 /**
3165  * ibmvfc_tasklet - Interrupt handler tasklet
3166  * @data:               ibmvfc host struct
3167  *
3168  * Returns:
3169  *      Nothing
3170  **/
3171 static void ibmvfc_tasklet(void *data)
3172 {
3173         struct ibmvfc_host *vhost = data;
3174         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3175         struct ibmvfc_crq *crq;
3176         struct ibmvfc_async_crq *async;
3177         unsigned long flags;
3178         int done = 0;
3179 
3180         spin_lock_irqsave(vhost->host->host_lock, flags);
3181         while (!done) {
3182                 /* Pull all the valid messages off the async CRQ */
3183                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3184                         ibmvfc_handle_async(async, vhost);
3185                         async->valid = 0;
3186                         wmb();
3187                 }
3188 
3189                 /* Pull all the valid messages off the CRQ */
3190                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3191                         ibmvfc_handle_crq(crq, vhost);
3192                         crq->valid = 0;
3193                         wmb();
3194                 }
3195 
3196                 vio_enable_interrupts(vdev);
3197                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3198                         vio_disable_interrupts(vdev);
3199                         ibmvfc_handle_async(async, vhost);
3200                         async->valid = 0;
3201                         wmb();
3202                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3203                         vio_disable_interrupts(vdev);
3204                         ibmvfc_handle_crq(crq, vhost);
3205                         crq->valid = 0;
3206                         wmb();
3207                 } else
3208                         done = 1;
3209         }
3210 
3211         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3212 }
3213 
3214 /**
3215  * ibmvfc_init_tgt - Set the next init job step for the target
3216  * @tgt:                ibmvfc target struct
3217  * @job_step:   job step to perform
3218  *
3219  **/
3220 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3221                             void (*job_step) (struct ibmvfc_target *))
3222 {
3223         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3224         tgt->job_step = job_step;
3225         wake_up(&tgt->vhost->work_wait_q);
3226 }
3227 
3228 /**
3229  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3230  * @tgt:                ibmvfc target struct
3231  * @job_step:   initialization job step
3232  *
3233  * Returns: 1 if step will be retried / 0 if not
3234  *
3235  **/
3236 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3237                                   void (*job_step) (struct ibmvfc_target *))
3238 {
3239         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3240                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3241                 wake_up(&tgt->vhost->work_wait_q);
3242                 return 0;
3243         } else
3244                 ibmvfc_init_tgt(tgt, job_step);
3245         return 1;
3246 }
3247 
3248 /* Defined in FC-LS */
3249 static const struct {
3250         int code;
3251         int retry;
3252         int logged_in;
3253 } prli_rsp [] = {
3254         { 0, 1, 0 },
3255         { 1, 0, 1 },
3256         { 2, 1, 0 },
3257         { 3, 1, 0 },
3258         { 4, 0, 0 },
3259         { 5, 0, 0 },
3260         { 6, 0, 1 },
3261         { 7, 0, 0 },
3262         { 8, 1, 0 },
3263 };
3264 
3265 /**
3266  * ibmvfc_get_prli_rsp - Find PRLI response index
3267  * @flags:      PRLI response flags
3268  *
3269  **/
3270 static int ibmvfc_get_prli_rsp(u16 flags)
3271 {
3272         int i;
3273         int code = (flags & 0x0f00) >> 8;
3274 
3275         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3276                 if (prli_rsp[i].code == code)
3277                         return i;
3278 
3279         return 0;
3280 }
3281 
3282 /**
3283  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3284  * @evt:        ibmvfc event struct
3285  *
3286  **/
3287 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3288 {
3289         struct ibmvfc_target *tgt = evt->tgt;
3290         struct ibmvfc_host *vhost = evt->vhost;
3291         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3292         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3293         u32 status = be16_to_cpu(rsp->common.status);
3294         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3295 
3296         vhost->discovery_threads--;
3297         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3298         switch (status) {
3299         case IBMVFC_MAD_SUCCESS:
3300                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3301                         parms->type, parms->flags, parms->service_parms);
3302 
3303                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3304                         index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3305                         if (prli_rsp[index].logged_in) {
3306                                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3307                                         tgt->need_login = 0;
3308                                         tgt->ids.roles = 0;
3309                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3310                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3311                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3312                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3313                                         tgt->add_rport = 1;
3314                                 } else
3315                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3316                         } else if (prli_rsp[index].retry)
3317                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3318                         else
3319                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3320                 } else
3321                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3322                 break;
3323         case IBMVFC_MAD_DRIVER_FAILED:
3324                 break;
3325         case IBMVFC_MAD_CRQ_ERROR:
3326                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3327                 break;
3328         case IBMVFC_MAD_FAILED:
3329         default:
3330                 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3331                      be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3332                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3333                 else if (tgt->logo_rcvd)
3334                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3335                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3336                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3337                 else
3338                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3339 
3340                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3341                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3342                         be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
3343                 break;
3344         }
3345 
3346         kref_put(&tgt->kref, ibmvfc_release_tgt);
3347         ibmvfc_free_event(evt);
3348         wake_up(&vhost->work_wait_q);
3349 }
3350 
3351 /**
3352  * ibmvfc_tgt_send_prli - Send a process login
3353  * @tgt:        ibmvfc target struct
3354  *
3355  **/
3356 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3357 {
3358         struct ibmvfc_process_login *prli;
3359         struct ibmvfc_host *vhost = tgt->vhost;
3360         struct ibmvfc_event *evt;
3361 
3362         if (vhost->discovery_threads >= disc_threads)
3363                 return;
3364 
3365         kref_get(&tgt->kref);
3366         evt = ibmvfc_get_event(vhost);
3367         vhost->discovery_threads++;
3368         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3369         evt->tgt = tgt;
3370         prli = &evt->iu.prli;
3371         memset(prli, 0, sizeof(*prli));
3372         prli->common.version = cpu_to_be32(1);
3373         prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
3374         prli->common.length = cpu_to_be16(sizeof(*prli));
3375         prli->scsi_id = cpu_to_be64(tgt->scsi_id);
3376 
3377         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3378         prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
3379         prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
3380         prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
3381 
3382         if (cls3_error)
3383                 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
3384 
3385         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3386         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3387                 vhost->discovery_threads--;
3388                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3389                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3390         } else
3391                 tgt_dbg(tgt, "Sent process login\n");
3392 }
3393 
3394 /**
3395  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3396  * @evt:        ibmvfc event struct
3397  *
3398  **/
3399 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3400 {
3401         struct ibmvfc_target *tgt = evt->tgt;
3402         struct ibmvfc_host *vhost = evt->vhost;
3403         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3404         u32 status = be16_to_cpu(rsp->common.status);
3405         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3406 
3407         vhost->discovery_threads--;
3408         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3409         switch (status) {
3410         case IBMVFC_MAD_SUCCESS:
3411                 tgt_dbg(tgt, "Port Login succeeded\n");
3412                 if (tgt->ids.port_name &&
3413                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3414                         vhost->reinit = 1;
3415                         tgt_dbg(tgt, "Port re-init required\n");
3416                         break;
3417                 }
3418                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3419                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3420                 tgt->ids.port_id = tgt->scsi_id;
3421                 memcpy(&tgt->service_parms, &rsp->service_parms,
3422                        sizeof(tgt->service_parms));
3423                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3424                        sizeof(tgt->service_parms_change));
3425                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3426                 break;
3427         case IBMVFC_MAD_DRIVER_FAILED:
3428                 break;
3429         case IBMVFC_MAD_CRQ_ERROR:
3430                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3431                 break;
3432         case IBMVFC_MAD_FAILED:
3433         default:
3434                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3435                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3436                 else
3437                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3438 
3439                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3440                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3441                                              be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
3442                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
3443                         ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
3444                 break;
3445         }
3446 
3447         kref_put(&tgt->kref, ibmvfc_release_tgt);
3448         ibmvfc_free_event(evt);
3449         wake_up(&vhost->work_wait_q);
3450 }
3451 
3452 /**
3453  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3454  * @tgt:        ibmvfc target struct
3455  *
3456  **/
3457 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3458 {
3459         struct ibmvfc_port_login *plogi;
3460         struct ibmvfc_host *vhost = tgt->vhost;
3461         struct ibmvfc_event *evt;
3462 
3463         if (vhost->discovery_threads >= disc_threads)
3464                 return;
3465 
3466         kref_get(&tgt->kref);
3467         tgt->logo_rcvd = 0;
3468         evt = ibmvfc_get_event(vhost);
3469         vhost->discovery_threads++;
3470         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3471         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3472         evt->tgt = tgt;
3473         plogi = &evt->iu.plogi;
3474         memset(plogi, 0, sizeof(*plogi));
3475         plogi->common.version = cpu_to_be32(1);
3476         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
3477         plogi->common.length = cpu_to_be16(sizeof(*plogi));
3478         plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
3479 
3480         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3481                 vhost->discovery_threads--;
3482                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3483                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3484         } else
3485                 tgt_dbg(tgt, "Sent port login\n");
3486 }
3487 
3488 /**
3489  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3490  * @evt:        ibmvfc event struct
3491  *
3492  **/
3493 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3494 {
3495         struct ibmvfc_target *tgt = evt->tgt;
3496         struct ibmvfc_host *vhost = evt->vhost;
3497         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3498         u32 status = be16_to_cpu(rsp->common.status);
3499 
3500         vhost->discovery_threads--;
3501         ibmvfc_free_event(evt);
3502         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3503 
3504         switch (status) {
3505         case IBMVFC_MAD_SUCCESS:
3506                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3507                 break;
3508         case IBMVFC_MAD_DRIVER_FAILED:
3509                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3510                 wake_up(&vhost->work_wait_q);
3511                 return;
3512         case IBMVFC_MAD_FAILED:
3513         default:
3514                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3515                 break;
3516         }
3517 
3518         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3519                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3520         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3521                  tgt->scsi_id != tgt->new_scsi_id)
3522                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3523         kref_put(&tgt->kref, ibmvfc_release_tgt);
3524         wake_up(&vhost->work_wait_q);
3525 }
3526 
3527 /**
3528  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3529  * @tgt:                ibmvfc target struct
3530  *
3531  **/
3532 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3533 {
3534         struct ibmvfc_implicit_logout *mad;
3535         struct ibmvfc_host *vhost = tgt->vhost;
3536         struct ibmvfc_event *evt;
3537 
3538         if (vhost->discovery_threads >= disc_threads)
3539                 return;
3540 
3541         kref_get(&tgt->kref);
3542         evt = ibmvfc_get_event(vhost);
3543         vhost->discovery_threads++;
3544         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3545         evt->tgt = tgt;
3546         mad = &evt->iu.implicit_logout;
3547         memset(mad, 0, sizeof(*mad));
3548         mad->common.version = cpu_to_be32(1);
3549         mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
3550         mad->common.length = cpu_to_be16(sizeof(*mad));
3551         mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
3552 
3553         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3554         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3555                 vhost->discovery_threads--;
3556                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3557                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3558         } else
3559                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3560 }
3561 
3562 /**
3563  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3564  * @mad:        ibmvfc passthru mad struct
3565  * @tgt:        ibmvfc target struct
3566  *
3567  * Returns:
3568  *      1 if PLOGI needed / 0 if PLOGI not needed
3569  **/
3570 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3571                                     struct ibmvfc_target *tgt)
3572 {
3573         if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
3574                 return 1;
3575         if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
3576                 return 1;
3577         if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
3578                 return 1;
3579         return 0;
3580 }
3581 
3582 /**
3583  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3584  * @evt:        ibmvfc event struct
3585  *
3586  **/
3587 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3588 {
3589         struct ibmvfc_target *tgt = evt->tgt;
3590         struct ibmvfc_host *vhost = evt->vhost;
3591         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3592         u32 status = be16_to_cpu(mad->common.status);
3593         u8 fc_reason, fc_explain;
3594 
3595         vhost->discovery_threads--;
3596         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3597         del_timer(&tgt->timer);
3598 
3599         switch (status) {
3600         case IBMVFC_MAD_SUCCESS:
3601                 tgt_dbg(tgt, "ADISC succeeded\n");
3602                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3603                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3604                 break;
3605         case IBMVFC_MAD_DRIVER_FAILED:
3606                 break;
3607         case IBMVFC_MAD_FAILED:
3608         default:
3609                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3610                 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
3611                 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
3612                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3613                          ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
3614                          be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
3615                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3616                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3617                 break;
3618         }
3619 
3620         kref_put(&tgt->kref, ibmvfc_release_tgt);
3621         ibmvfc_free_event(evt);
3622         wake_up(&vhost->work_wait_q);
3623 }
3624 
3625 /**
3626  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3627  * @evt:                ibmvfc event struct
3628  *
3629  **/
3630 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3631 {
3632         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3633 
3634         memset(mad, 0, sizeof(*mad));
3635         mad->common.version = cpu_to_be32(1);
3636         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
3637         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
3638         mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3639                 offsetof(struct ibmvfc_passthru_mad, iu));
3640         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
3641         mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3642         mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
3643         mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3644                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3645                 offsetof(struct ibmvfc_passthru_fc_iu, payload));
3646         mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3647         mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3648                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3649                 offsetof(struct ibmvfc_passthru_fc_iu, response));
3650         mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
3651 }
3652 
3653 /**
3654  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3655  * @evt:                ibmvfc event struct
3656  *
3657  * Just cleanup this event struct. Everything else is handled by
3658  * the ADISC completion handler. If the ADISC never actually comes
3659  * back, we still have the timer running on the ADISC event struct
3660  * which will fire and cause the CRQ to get reset.
3661  *
3662  **/
3663 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3664 {
3665         struct ibmvfc_host *vhost = evt->vhost;
3666         struct ibmvfc_target *tgt = evt->tgt;
3667 
3668         tgt_dbg(tgt, "ADISC cancel complete\n");
3669         vhost->abort_threads--;
3670         ibmvfc_free_event(evt);
3671         kref_put(&tgt->kref, ibmvfc_release_tgt);
3672         wake_up(&vhost->work_wait_q);
3673 }
3674 
3675 /**
3676  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3677  * @tgt:                ibmvfc target struct
3678  *
3679  * If an ADISC times out, send a cancel. If the cancel times
3680  * out, reset the CRQ. When the ADISC comes back as cancelled,
3681  * log back into the target.
3682  **/
3683 static void ibmvfc_adisc_timeout(struct timer_list *t)
3684 {
3685         struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
3686         struct ibmvfc_host *vhost = tgt->vhost;
3687         struct ibmvfc_event *evt;
3688         struct ibmvfc_tmf *tmf;
3689         unsigned long flags;
3690         int rc;
3691 
3692         tgt_dbg(tgt, "ADISC timeout\n");
3693         spin_lock_irqsave(vhost->host->host_lock, flags);
3694         if (vhost->abort_threads >= disc_threads ||
3695             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3696             vhost->state != IBMVFC_INITIALIZING ||
3697             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3698                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3699                 return;
3700         }
3701 
3702         vhost->abort_threads++;
3703         kref_get(&tgt->kref);
3704         evt = ibmvfc_get_event(vhost);
3705         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3706 
3707         evt->tgt = tgt;
3708         tmf = &evt->iu.tmf;
3709         memset(tmf, 0, sizeof(*tmf));
3710         tmf->common.version = cpu_to_be32(1);
3711         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
3712         tmf->common.length = cpu_to_be16(sizeof(*tmf));
3713         tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
3714         tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
3715 
3716         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3717 
3718         if (rc) {
3719                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3720                 vhost->abort_threads--;
3721                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3722                 __ibmvfc_reset_host(vhost);
3723         } else
3724                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3725         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3726 }
3727 
3728 /**
3729  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3730  * @tgt:                ibmvfc target struct
3731  *
3732  * When sending an ADISC we end up with two timers running. The
3733  * first timer is the timer in the ibmvfc target struct. If this
3734  * fires, we send a cancel to the target. The second timer is the
3735  * timer on the ibmvfc event for the ADISC, which is longer. If that
3736  * fires, it means the ADISC timed out and our attempt to cancel it
3737  * also failed, so we need to reset the CRQ.
3738  **/
3739 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3740 {
3741         struct ibmvfc_passthru_mad *mad;
3742         struct ibmvfc_host *vhost = tgt->vhost;
3743         struct ibmvfc_event *evt;
3744 
3745         if (vhost->discovery_threads >= disc_threads)
3746                 return;
3747 
3748         kref_get(&tgt->kref);
3749         evt = ibmvfc_get_event(vhost);
3750         vhost->discovery_threads++;
3751         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3752         evt->tgt = tgt;
3753 
3754         ibmvfc_init_passthru(evt);
3755         mad = &evt->iu.passthru;
3756         mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
3757         mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
3758         mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
3759 
3760         mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
3761         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3762                sizeof(vhost->login_buf->resp.port_name));
3763         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3764                sizeof(vhost->login_buf->resp.node_name));
3765         mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
3766 
3767         if (timer_pending(&tgt->timer))
3768                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3769         else {
3770                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3771                 add_timer(&tgt->timer);
3772         }
3773 
3774         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3775         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3776                 vhost->discovery_threads--;
3777                 del_timer(&tgt->timer);
3778                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3779                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3780         } else
3781                 tgt_dbg(tgt, "Sent ADISC\n");
3782 }
3783 
3784 /**
3785  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3786  * @evt:        ibmvfc event struct
3787  *
3788  **/
3789 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3790 {
3791         struct ibmvfc_target *tgt = evt->tgt;
3792         struct ibmvfc_host *vhost = evt->vhost;
3793         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3794         u32 status = be16_to_cpu(rsp->common.status);
3795         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3796 
3797         vhost->discovery_threads--;
3798         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3799         switch (status) {
3800         case IBMVFC_MAD_SUCCESS:
3801                 tgt_dbg(tgt, "Query Target succeeded\n");
3802                 tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
3803                 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
3804                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3805                 else
3806                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3807                 break;
3808         case IBMVFC_MAD_DRIVER_FAILED:
3809                 break;
3810         case IBMVFC_MAD_CRQ_ERROR:
3811                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3812                 break;
3813         case IBMVFC_MAD_FAILED:
3814         default:
3815                 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3816                     be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3817                     be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
3818                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3819                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3820                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3821                 else
3822                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3823 
3824                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3825                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3826                         be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
3827                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
3828                         ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
3829                         status);
3830                 break;
3831         }
3832 
3833         kref_put(&tgt->kref, ibmvfc_release_tgt);
3834         ibmvfc_free_event(evt);
3835         wake_up(&vhost->work_wait_q);
3836 }
3837 
3838 /**
3839  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3840  * @tgt:        ibmvfc target struct
3841  *
3842  **/
3843 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3844 {
3845         struct ibmvfc_query_tgt *query_tgt;
3846         struct ibmvfc_host *vhost = tgt->vhost;
3847         struct ibmvfc_event *evt;
3848 
3849         if (vhost->discovery_threads >= disc_threads)
3850                 return;
3851 
3852         kref_get(&tgt->kref);
3853         evt = ibmvfc_get_event(vhost);
3854         vhost->discovery_threads++;
3855         evt->tgt = tgt;
3856         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3857         query_tgt = &evt->iu.query_tgt;
3858         memset(query_tgt, 0, sizeof(*query_tgt));
3859         query_tgt->common.version = cpu_to_be32(1);
3860         query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
3861         query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
3862         query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
3863 
3864         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3865         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3866                 vhost->discovery_threads--;
3867                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3868                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3869         } else
3870                 tgt_dbg(tgt, "Sent Query Target\n");
3871 }
3872 
3873 /**
3874  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3875  * @vhost:              ibmvfc host struct
3876  * @scsi_id:    SCSI ID to allocate target for
3877  *
3878  * Returns:
3879  *      0 on success / other on failure
3880  **/
3881 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3882 {
3883         struct ibmvfc_target *tgt;
3884         unsigned long flags;
3885 
3886         spin_lock_irqsave(vhost->host->host_lock, flags);
3887         list_for_each_entry(tgt, &vhost->targets, queue) {
3888                 if (tgt->scsi_id == scsi_id) {
3889                         if (tgt->need_login)
3890                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3891                         goto unlock_out;
3892                 }
3893         }
3894         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3895 
3896         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3897         memset(tgt, 0, sizeof(*tgt));
3898         tgt->scsi_id = scsi_id;
3899         tgt->new_scsi_id = scsi_id;
3900         tgt->vhost = vhost;
3901         tgt->need_login = 1;
3902         tgt->cancel_key = vhost->task_set++;
3903         timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
3904         kref_init(&tgt->kref);
3905         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3906         spin_lock_irqsave(vhost->host->host_lock, flags);
3907         list_add_tail(&tgt->queue, &vhost->targets);
3908 
3909 unlock_out:
3910         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3911         return 0;
3912 }
3913 
3914 /**
3915  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3916  * @vhost:              ibmvfc host struct
3917  *
3918  * Returns:
3919  *      0 on success / other on failure
3920  **/
3921 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3922 {
3923         int i, rc;
3924 
3925         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3926                 rc = ibmvfc_alloc_target(vhost,
3927                                          be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
3928                                          IBMVFC_DISC_TGT_SCSI_ID_MASK);
3929 
3930         return rc;
3931 }
3932 
3933 /**
3934  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3935  * @evt:        ibmvfc event struct
3936  *
3937  **/
3938 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3939 {
3940         struct ibmvfc_host *vhost = evt->vhost;
3941         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3942         u32 mad_status = be16_to_cpu(rsp->common.status);
3943         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3944 
3945         switch (mad_status) {
3946         case IBMVFC_MAD_SUCCESS:
3947                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3948                 vhost->num_targets = be32_to_cpu(rsp->num_written);
3949                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3950                 break;
3951         case IBMVFC_MAD_FAILED:
3952                 level += ibmvfc_retry_host_init(vhost);
3953                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3954                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3955                            be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
3956                 break;
3957         case IBMVFC_MAD_DRIVER_FAILED:
3958                 break;
3959         default:
3960                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3961                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3962                 break;
3963         }
3964 
3965         ibmvfc_free_event(evt);
3966         wake_up(&vhost->work_wait_q);
3967 }
3968 
3969 /**
3970  * ibmvfc_discover_targets - Send Discover Targets MAD
3971  * @vhost:      ibmvfc host struct
3972  *
3973  **/
3974 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3975 {
3976         struct ibmvfc_discover_targets *mad;
3977         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3978 
3979         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3980         mad = &evt->iu.discover_targets;
3981         memset(mad, 0, sizeof(*mad));
3982         mad->common.version = cpu_to_be32(1);
3983         mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
3984         mad->common.length = cpu_to_be16(sizeof(*mad));
3985         mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
3986         mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
3987         mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
3988         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3989 
3990         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3991                 ibmvfc_dbg(vhost, "Sent discover targets\n");
3992         else
3993                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3994 }
3995 
3996 /**
3997  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
3998  * @evt:        ibmvfc event struct
3999  *
4000  **/
4001 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4002 {
4003         struct ibmvfc_host *vhost = evt->vhost;
4004         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
4005         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4006         unsigned int npiv_max_sectors;
4007         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4008 
4009         switch (mad_status) {
4010         case IBMVFC_MAD_SUCCESS:
4011                 ibmvfc_free_event(evt);
4012                 break;
4013         case IBMVFC_MAD_FAILED:
4014                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4015                         level += ibmvfc_retry_host_init(vhost);
4016                 else
4017                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4018                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4019                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4020                                                 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4021                 ibmvfc_free_event(evt);
4022                 return;
4023         case IBMVFC_MAD_CRQ_ERROR:
4024                 ibmvfc_retry_host_init(vhost);
4025                 /* fall through */
4026         case IBMVFC_MAD_DRIVER_FAILED:
4027                 ibmvfc_free_event(evt);
4028                 return;
4029         default:
4030                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4031                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4032                 ibmvfc_free_event(evt);
4033                 return;
4034         }
4035 
4036         vhost->client_migrated = 0;
4037 
4038         if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
4039                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4040                         rsp->flags);
4041                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4042                 wake_up(&vhost->work_wait_q);
4043                 return;
4044         }
4045 
4046         if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
4047                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4048                         rsp->max_cmds);
4049                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4050                 wake_up(&vhost->work_wait_q);
4051                 return;
4052         }
4053 
4054         vhost->logged_in = 1;
4055         npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
4056         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4057                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4058                  rsp->drc_name, npiv_max_sectors);
4059 
4060         fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
4061         fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
4062         fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
4063         fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
4064         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4065         fc_host_supported_classes(vhost->host) = 0;
4066         if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
4067                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4068         if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
4069                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4070         if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
4071                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4072         fc_host_maxframe_size(vhost->host) =
4073                 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
4074 
4075         vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
4076         vhost->host->max_sectors = npiv_max_sectors;
4077         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4078         wake_up(&vhost->work_wait_q);
4079 }
4080 
4081 /**
4082  * ibmvfc_npiv_login - Sends NPIV login
4083  * @vhost:      ibmvfc host struct
4084  *
4085  **/
4086 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4087 {
4088         struct ibmvfc_npiv_login_mad *mad;
4089         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4090 
4091         ibmvfc_gather_partition_info(vhost);
4092         ibmvfc_set_login_info(vhost);
4093         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4094 
4095         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4096         mad = &evt->iu.npiv_login;
4097         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4098         mad->common.version = cpu_to_be32(1);
4099         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
4100         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
4101         mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
4102         mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
4103 
4104         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4105 
4106         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4107                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4108         else
4109                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4110 };
4111 
4112 /**
4113  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4114  * @vhost:              ibmvfc host struct
4115  *
4116  **/
4117 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4118 {
4119         struct ibmvfc_host *vhost = evt->vhost;
4120         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
4121 
4122         ibmvfc_free_event(evt);
4123 
4124         switch (mad_status) {
4125         case IBMVFC_MAD_SUCCESS:
4126                 if (list_empty(&vhost->sent) &&
4127                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4128                         ibmvfc_init_host(vhost);
4129                         return;
4130                 }
4131                 break;
4132         case IBMVFC_MAD_FAILED:
4133         case IBMVFC_MAD_NOT_SUPPORTED:
4134         case IBMVFC_MAD_CRQ_ERROR:
4135         case IBMVFC_MAD_DRIVER_FAILED:
4136         default:
4137                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4138                 break;
4139         }
4140 
4141         ibmvfc_hard_reset_host(vhost);
4142 }
4143 
4144 /**
4145  * ibmvfc_npiv_logout - Issue an NPIV Logout
4146  * @vhost:              ibmvfc host struct
4147  *
4148  **/
4149 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4150 {
4151         struct ibmvfc_npiv_logout_mad *mad;
4152         struct ibmvfc_event *evt;
4153 
4154         evt = ibmvfc_get_event(vhost);
4155         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4156 
4157         mad = &evt->iu.npiv_logout;
4158         memset(mad, 0, sizeof(*mad));
4159         mad->common.version = cpu_to_be32(1);
4160         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
4161         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
4162 
4163         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4164 
4165         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4166                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4167         else
4168                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4169 }
4170 
4171 /**
4172  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4173  * @vhost:              ibmvfc host struct
4174  *
4175  * Returns:
4176  *      1 if work to do / 0 if not
4177  **/
4178 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4179 {
4180         struct ibmvfc_target *tgt;
4181 
4182         list_for_each_entry(tgt, &vhost->targets, queue) {
4183                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4184                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4185                         return 1;
4186         }
4187 
4188         return 0;
4189 }
4190 
4191 /**
4192  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4193  * @vhost:              ibmvfc host struct
4194  *
4195  * Returns:
4196  *      1 if work to do / 0 if not
4197  **/
4198 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4199 {
4200         struct ibmvfc_target *tgt;
4201 
4202         if (kthread_should_stop())
4203                 return 1;
4204         switch (vhost->action) {
4205         case IBMVFC_HOST_ACTION_NONE:
4206         case IBMVFC_HOST_ACTION_INIT_WAIT:
4207         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4208                 return 0;
4209         case IBMVFC_HOST_ACTION_TGT_INIT:
4210         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4211                 if (vhost->discovery_threads == disc_threads)
4212                         return 0;
4213                 list_for_each_entry(tgt, &vhost->targets, queue)
4214                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4215                                 return 1;
4216                 list_for_each_entry(tgt, &vhost->targets, queue)
4217                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4218                                 return 0;
4219                 return 1;
4220         case IBMVFC_HOST_ACTION_LOGO:
4221         case IBMVFC_HOST_ACTION_INIT:
4222         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4223         case IBMVFC_HOST_ACTION_TGT_DEL:
4224         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4225         case IBMVFC_HOST_ACTION_QUERY:
4226         case IBMVFC_HOST_ACTION_RESET:
4227         case IBMVFC_HOST_ACTION_REENABLE:
4228         default:
4229                 break;
4230         }
4231 
4232         return 1;
4233 }
4234 
4235 /**
4236  * ibmvfc_work_to_do - Is there task level work to do?
4237  * @vhost:              ibmvfc host struct
4238  *
4239  * Returns:
4240  *      1 if work to do / 0 if not
4241  **/
4242 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4243 {
4244         unsigned long flags;
4245         int rc;
4246 
4247         spin_lock_irqsave(vhost->host->host_lock, flags);
4248         rc = __ibmvfc_work_to_do(vhost);
4249         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4250         return rc;
4251 }
4252 
4253 /**
4254  * ibmvfc_log_ae - Log async events if necessary
4255  * @vhost:              ibmvfc host struct
4256  * @events:             events to log
4257  *
4258  **/
4259 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4260 {
4261         if (events & IBMVFC_AE_RSCN)
4262                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4263         if ((events & IBMVFC_AE_LINKDOWN) &&
4264             vhost->state >= IBMVFC_HALTED)
4265                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4266         if ((events & IBMVFC_AE_LINKUP) &&
4267             vhost->state == IBMVFC_INITIALIZING)
4268                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4269 }
4270 
4271 /**
4272  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4273  * @tgt:                ibmvfc target struct
4274  *
4275  **/
4276 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4277 {
4278         struct ibmvfc_host *vhost = tgt->vhost;
4279         struct fc_rport *rport;
4280         unsigned long flags;
4281 
4282         tgt_dbg(tgt, "Adding rport\n");
4283         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4284         spin_lock_irqsave(vhost->host->host_lock, flags);
4285 
4286         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4287                 tgt_dbg(tgt, "Deleting rport\n");
4288                 list_del(&tgt->queue);
4289                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4290                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4291                 fc_remote_port_delete(rport);
4292                 del_timer_sync(&tgt->timer);
4293                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4294                 return;
4295         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4296                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4297                 return;
4298         }
4299 
4300         if (rport) {
4301                 tgt_dbg(tgt, "rport add succeeded\n");
4302                 tgt->rport = rport;
4303                 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
4304                 rport->supported_classes = 0;
4305                 tgt->target_id = rport->scsi_target_id;
4306                 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
4307                         rport->supported_classes |= FC_COS_CLASS1;
4308                 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
4309                         rport->supported_classes |= FC_COS_CLASS2;
4310                 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
4311                         rport->supported_classes |= FC_COS_CLASS3;
4312                 if (rport->rqst_q)
4313                         blk_queue_max_segments(rport->rqst_q, 1);
4314         } else
4315                 tgt_dbg(tgt, "rport add failed\n");
4316         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4317 }
4318 
4319 /**
4320  * ibmvfc_do_work - Do task level work
4321  * @vhost:              ibmvfc host struct
4322  *
4323  **/
4324 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4325 {
4326         struct ibmvfc_target *tgt;
4327         unsigned long flags;
4328         struct fc_rport *rport;
4329         int rc;
4330 
4331         ibmvfc_log_ae(vhost, vhost->events_to_log);
4332         spin_lock_irqsave(vhost->host->host_lock, flags);
4333         vhost->events_to_log = 0;
4334         switch (vhost->action) {
4335         case IBMVFC_HOST_ACTION_NONE:
4336         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4337         case IBMVFC_HOST_ACTION_INIT_WAIT:
4338                 break;
4339         case IBMVFC_HOST_ACTION_RESET:
4340                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4341                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4342                 rc = ibmvfc_reset_crq(vhost);
4343                 spin_lock_irqsave(vhost->host->host_lock, flags);
4344                 if (rc == H_CLOSED)
4345                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4346                 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4347                     (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4348                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4349                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4350                 }
4351                 break;
4352         case IBMVFC_HOST_ACTION_REENABLE:
4353                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4354                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4355                 rc = ibmvfc_reenable_crq_queue(vhost);
4356                 spin_lock_irqsave(vhost->host->host_lock, flags);
4357                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4358                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4359                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4360                 }
4361                 break;
4362         case IBMVFC_HOST_ACTION_LOGO:
4363                 vhost->job_step(vhost);
4364                 break;
4365         case IBMVFC_HOST_ACTION_INIT:
4366                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4367                 if (vhost->delay_init) {
4368                         vhost->delay_init = 0;
4369                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4370                         ssleep(15);
4371                         return;
4372                 } else
4373                         vhost->job_step(vhost);
4374                 break;
4375         case IBMVFC_HOST_ACTION_QUERY:
4376                 list_for_each_entry(tgt, &vhost->targets, queue)
4377                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4378                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4379                 break;
4380         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4381                 list_for_each_entry(tgt, &vhost->targets, queue) {
4382                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4383                                 tgt->job_step(tgt);
4384                                 break;
4385                         }
4386                 }
4387 
4388                 if (!ibmvfc_dev_init_to_do(vhost))
4389                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4390                 break;
4391         case IBMVFC_HOST_ACTION_TGT_DEL:
4392         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4393                 list_for_each_entry(tgt, &vhost->targets, queue) {
4394                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4395                                 tgt_dbg(tgt, "Deleting rport\n");
4396                                 rport = tgt->rport;
4397                                 tgt->rport = NULL;
4398                                 list_del(&tgt->queue);
4399                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4400                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4401                                 if (rport)
4402                                         fc_remote_port_delete(rport);
4403                                 del_timer_sync(&tgt->timer);
4404                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4405                                 return;
4406                         }
4407                 }
4408 
4409                 if (vhost->state == IBMVFC_INITIALIZING) {
4410                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4411                                 if (vhost->reinit) {
4412                                         vhost->reinit = 0;
4413                                         scsi_block_requests(vhost->host);
4414                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4415                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4416                                 } else {
4417                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4418                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4419                                         wake_up(&vhost->init_wait_q);
4420                                         schedule_work(&vhost->rport_add_work_q);
4421                                         vhost->init_retries = 0;
4422                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4423                                         scsi_unblock_requests(vhost->host);
4424                                 }
4425 
4426                                 return;
4427                         } else {
4428                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4429                                 vhost->job_step = ibmvfc_discover_targets;
4430                         }
4431                 } else {
4432                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4433                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4434                         scsi_unblock_requests(vhost->host);
4435                         wake_up(&vhost->init_wait_q);
4436                         return;
4437                 }
4438                 break;
4439         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4440                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4441                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4442                 ibmvfc_alloc_targets(vhost);
4443                 spin_lock_irqsave(vhost->host->host_lock, flags);
4444                 break;
4445         case IBMVFC_HOST_ACTION_TGT_INIT:
4446                 list_for_each_entry(tgt, &vhost->targets, queue) {
4447                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4448                                 tgt->job_step(tgt);
4449                                 break;
4450                         }
4451                 }
4452 
4453                 if (!ibmvfc_dev_init_to_do(vhost))
4454                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4455                 break;
4456         default:
4457                 break;
4458         }
4459 
4460         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4461 }
4462 
4463 /**
4464  * ibmvfc_work - Do task level work
4465  * @data:               ibmvfc host struct
4466  *
4467  * Returns:
4468  *      zero
4469  **/
4470 static int ibmvfc_work(void *data)
4471 {
4472         struct ibmvfc_host *vhost = data;
4473         int rc;
4474 
4475         set_user_nice(current, MIN_NICE);
4476 
4477         while (1) {
4478                 rc = wait_event_interruptible(vhost->work_wait_q,
4479                                               ibmvfc_work_to_do(vhost));
4480 
4481                 BUG_ON(rc);
4482 
4483                 if (kthread_should_stop())
4484                         break;
4485 
4486                 ibmvfc_do_work(vhost);
4487         }
4488 
4489         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4490         return 0;
4491 }
4492 
4493 /**
4494  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4495  * @vhost:      ibmvfc host struct
4496  *
4497  * Allocates a page for messages, maps it for dma, and registers
4498  * the crq with the hypervisor.
4499  *
4500  * Return value:
4501  *      zero on success / other on failure
4502  **/
4503 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4504 {
4505         int rc, retrc = -ENOMEM;
4506         struct device *dev = vhost->dev;
4507         struct vio_dev *vdev = to_vio_dev(dev);
4508         struct ibmvfc_crq_queue *crq = &vhost->crq;
4509 
4510         ENTER;
4511         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4512 
4513         if (!crq->msgs)
4514                 return -ENOMEM;
4515 
4516         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4517         crq->msg_token = dma_map_single(dev, crq->msgs,
4518                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4519 
4520         if (dma_mapping_error(dev, crq->msg_token))
4521                 goto map_failed;
4522 
4523         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4524                                         crq->msg_token, PAGE_SIZE);
4525 
4526         if (rc == H_RESOURCE)
4527                 /* maybe kexecing and resource is busy. try a reset */
4528                 retrc = rc = ibmvfc_reset_crq(vhost);
4529 
4530         if (rc == H_CLOSED)
4531                 dev_warn(dev, "Partner adapter not ready\n");
4532         else if (rc) {
4533                 dev_warn(dev, "Error %d opening adapter\n", rc);
4534                 goto reg_crq_failed;
4535         }
4536 
4537         retrc = 0;
4538 
4539         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4540 
4541         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4542                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4543                 goto req_irq_failed;
4544         }
4545 
4546         if ((rc = vio_enable_interrupts(vdev))) {
4547                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4548                 goto req_irq_failed;
4549         }
4550 
4551         crq->cur = 0;
4552         LEAVE;
4553         return retrc;
4554 
4555 req_irq_failed:
4556         tasklet_kill(&vhost->tasklet);
4557         do {
4558                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4559         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4560 reg_crq_failed:
4561         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4562 map_failed:
4563         free_page((unsigned long)crq->msgs);
4564         return retrc;
4565 }
4566 
4567 /**
4568  * ibmvfc_free_mem - Free memory for vhost
4569  * @vhost:      ibmvfc host struct
4570  *
4571  * Return value:
4572  *      none
4573  **/
4574 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4575 {
4576         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4577 
4578         ENTER;
4579         mempool_destroy(vhost->tgt_pool);
4580         kfree(vhost->trace);
4581         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4582                           vhost->disc_buf_dma);
4583         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4584                           vhost->login_buf, vhost->login_buf_dma);
4585         dma_pool_destroy(vhost->sg_pool);
4586         dma_unmap_single(vhost->dev, async_q->msg_token,
4587                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4588         free_page((unsigned long)async_q->msgs);
4589         LEAVE;
4590 }
4591 
4592 /**
4593  * ibmvfc_alloc_mem - Allocate memory for vhost
4594  * @vhost:      ibmvfc host struct
4595  *
4596  * Return value:
4597  *      0 on success / non-zero on failure
4598  **/
4599 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4600 {
4601         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4602         struct device *dev = vhost->dev;
4603 
4604         ENTER;
4605         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4606         if (!async_q->msgs) {
4607                 dev_err(dev, "Couldn't allocate async queue.\n");
4608                 goto nomem;
4609         }
4610 
4611         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4612         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4613                                             async_q->size * sizeof(*async_q->msgs),
4614                                             DMA_BIDIRECTIONAL);
4615 
4616         if (dma_mapping_error(dev, async_q->msg_token)) {
4617                 dev_err(dev, "Failed to map async queue\n");
4618                 goto free_async_crq;
4619         }
4620 
4621         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4622                                          SG_ALL * sizeof(struct srp_direct_buf),
4623                                          sizeof(struct srp_direct_buf), 0);
4624 
4625         if (!vhost->sg_pool) {
4626                 dev_err(dev, "Failed to allocate sg pool\n");
4627                 goto unmap_async_crq;
4628         }
4629 
4630         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4631                                               &vhost->login_buf_dma, GFP_KERNEL);
4632 
4633         if (!vhost->login_buf) {
4634                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4635                 goto free_sg_pool;
4636         }
4637 
4638         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4639         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4640                                              &vhost->disc_buf_dma, GFP_KERNEL);
4641 
4642         if (!vhost->disc_buf) {
4643                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4644                 goto free_login_buffer;
4645         }
4646 
4647         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4648                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4649 
4650         if (!vhost->trace)
4651                 goto free_disc_buffer;
4652 
4653         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4654                                                       sizeof(struct ibmvfc_target));
4655 
4656         if (!vhost->tgt_pool) {
4657                 dev_err(dev, "Couldn't allocate target memory pool\n");
4658                 goto free_trace;
4659         }
4660 
4661         LEAVE;
4662         return 0;
4663 
4664 free_trace:
4665         kfree(vhost->trace);
4666 free_disc_buffer:
4667         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4668                           vhost->disc_buf_dma);
4669 free_login_buffer:
4670         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4671                           vhost->login_buf, vhost->login_buf_dma);
4672 free_sg_pool:
4673         dma_pool_destroy(vhost->sg_pool);
4674 unmap_async_crq:
4675         dma_unmap_single(dev, async_q->msg_token,
4676                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4677 free_async_crq:
4678         free_page((unsigned long)async_q->msgs);
4679 nomem:
4680         LEAVE;
4681         return -ENOMEM;
4682 }
4683 
4684 /**
4685  * ibmvfc_rport_add_thread - Worker thread for rport adds
4686  * @work:       work struct
4687  *
4688  **/
4689 static void ibmvfc_rport_add_thread(struct work_struct *work)
4690 {
4691         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4692                                                  rport_add_work_q);
4693         struct ibmvfc_target *tgt;
4694         struct fc_rport *rport;
4695         unsigned long flags;
4696         int did_work;
4697 
4698         ENTER;
4699         spin_lock_irqsave(vhost->host->host_lock, flags);
4700         do {
4701                 did_work = 0;
4702                 if (vhost->state != IBMVFC_ACTIVE)
4703                         break;
4704 
4705                 list_for_each_entry(tgt, &vhost->targets, queue) {
4706                         if (tgt->add_rport) {
4707                                 did_work = 1;
4708                                 tgt->add_rport = 0;
4709                                 kref_get(&tgt->kref);
4710                                 rport = tgt->rport;
4711                                 if (!rport) {
4712                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4713                                         ibmvfc_tgt_add_rport(tgt);
4714                                 } else if (get_device(&rport->dev)) {
4715                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4716                                         tgt_dbg(tgt, "Setting rport roles\n");
4717                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4718                                         put_device(&rport->dev);
4719                                 } else {
4720                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4721                                 }
4722 
4723                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4724                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4725                                 break;
4726                         }
4727                 }
4728         } while(did_work);
4729 
4730         if (vhost->state == IBMVFC_ACTIVE)
4731                 vhost->scan_complete = 1;
4732         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4733         LEAVE;
4734 }
4735 
4736 /**
4737  * ibmvfc_probe - Adapter hot plug add entry point
4738  * @vdev:       vio device struct
4739  * @id: vio device id struct
4740  *
4741  * Return value:
4742  *      0 on success / non-zero on failure
4743  **/
4744 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4745 {
4746         struct ibmvfc_host *vhost;
4747         struct Scsi_Host *shost;
4748         struct device *dev = &vdev->dev;
4749         int rc = -ENOMEM;
4750 
4751         ENTER;
4752         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4753         if (!shost) {
4754                 dev_err(dev, "Couldn't allocate host data\n");
4755                 goto out;
4756         }
4757 
4758         shost->transportt = ibmvfc_transport_template;
4759         shost->can_queue = max_requests;
4760         shost->max_lun = max_lun;
4761         shost->max_id = max_targets;
4762         shost->max_sectors = IBMVFC_MAX_SECTORS;
4763         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4764         shost->unique_id = shost->host_no;
4765 
4766         vhost = shost_priv(shost);
4767         INIT_LIST_HEAD(&vhost->sent);
4768         INIT_LIST_HEAD(&vhost->free);
4769         INIT_LIST_HEAD(&vhost->targets);
4770         sprintf(vhost->name, IBMVFC_NAME);
4771         vhost->host = shost;
4772         vhost->dev = dev;
4773         vhost->partition_number = -1;
4774         vhost->log_level = log_level;
4775         vhost->task_set = 1;
4776         strcpy(vhost->partition_name, "UNKNOWN");
4777         init_waitqueue_head(&vhost->work_wait_q);
4778         init_waitqueue_head(&vhost->init_wait_q);
4779         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4780         mutex_init(&vhost->passthru_mutex);
4781 
4782         if ((rc = ibmvfc_alloc_mem(vhost)))
4783                 goto free_scsi_host;
4784 
4785         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4786                                          shost->host_no);
4787 
4788         if (IS_ERR(vhost->work_thread)) {
4789                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4790                         PTR_ERR(vhost->work_thread));
4791                 goto free_host_mem;
4792         }
4793 
4794         if ((rc = ibmvfc_init_crq(vhost))) {
4795                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4796                 goto kill_kthread;
4797         }
4798 
4799         if ((rc = ibmvfc_init_event_pool(vhost))) {
4800                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4801                 goto release_crq;
4802         }
4803 
4804         if ((rc = scsi_add_host(shost, dev)))
4805                 goto release_event_pool;
4806 
4807         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4808 
4809         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4810                                            &ibmvfc_trace_attr))) {
4811                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4812                 goto remove_shost;
4813         }
4814 
4815         if (shost_to_fc_host(shost)->rqst_q)
4816                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4817         dev_set_drvdata(dev, vhost);
4818         spin_lock(&ibmvfc_driver_lock);
4819         list_add_tail(&vhost->queue, &ibmvfc_head);
4820         spin_unlock(&ibmvfc_driver_lock);
4821 
4822         ibmvfc_send_crq_init(vhost);
4823         scsi_scan_host(shost);
4824         return 0;
4825 
4826 remove_shost:
4827         scsi_remove_host(shost);
4828 release_event_pool:
4829         ibmvfc_free_event_pool(vhost);
4830 release_crq:
4831         ibmvfc_release_crq_queue(vhost);
4832 kill_kthread:
4833         kthread_stop(vhost->work_thread);
4834 free_host_mem:
4835         ibmvfc_free_mem(vhost);
4836 free_scsi_host:
4837         scsi_host_put(shost);
4838 out:
4839         LEAVE;
4840         return rc;
4841 }
4842 
4843 /**
4844  * ibmvfc_remove - Adapter hot plug remove entry point
4845  * @vdev:       vio device struct
4846  *
4847  * Return value:
4848  *      0
4849  **/
4850 static int ibmvfc_remove(struct vio_dev *vdev)
4851 {
4852         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4853         unsigned long flags;
4854 
4855         ENTER;
4856         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4857 
4858         spin_lock_irqsave(vhost->host->host_lock, flags);
4859         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4860         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4861 
4862         ibmvfc_wait_while_resetting(vhost);
4863         ibmvfc_release_crq_queue(vhost);
4864         kthread_stop(vhost->work_thread);
4865         fc_remove_host(vhost->host);
4866         scsi_remove_host(vhost->host);
4867 
4868         spin_lock_irqsave(vhost->host->host_lock, flags);
4869         ibmvfc_purge_requests(vhost, DID_ERROR);
4870         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4871         ibmvfc_free_event_pool(vhost);
4872 
4873         ibmvfc_free_mem(vhost);
4874         spin_lock(&ibmvfc_driver_lock);
4875         list_del(&vhost->queue);
4876         spin_unlock(&ibmvfc_driver_lock);
4877         scsi_host_put(vhost->host);
4878         LEAVE;
4879         return 0;
4880 }
4881 
4882 /**
4883  * ibmvfc_resume - Resume from suspend
4884  * @dev:        device struct
4885  *
4886  * We may have lost an interrupt across suspend/resume, so kick the
4887  * interrupt handler
4888  *
4889  */
4890 static int ibmvfc_resume(struct device *dev)
4891 {
4892         unsigned long flags;
4893         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4894         struct vio_dev *vdev = to_vio_dev(dev);
4895 
4896         spin_lock_irqsave(vhost->host->host_lock, flags);
4897         vio_disable_interrupts(vdev);
4898         tasklet_schedule(&vhost->tasklet);
4899         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4900         return 0;
4901 }
4902 
4903 /**
4904  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4905  * @vdev:       vio device struct
4906  *
4907  * Return value:
4908  *      Number of bytes the driver will need to DMA map at the same time in
4909  *      order to perform well.
4910  */
4911 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4912 {
4913         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4914         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4915 }
4916 
4917 static const struct vio_device_id ibmvfc_device_table[] = {
4918         {"fcp", "IBM,vfc-client"},
4919         { "", "" }
4920 };
4921 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4922 
4923 static const struct dev_pm_ops ibmvfc_pm_ops = {
4924         .resume = ibmvfc_resume
4925 };
4926 
4927 static struct vio_driver ibmvfc_driver = {
4928         .id_table = ibmvfc_device_table,
4929         .probe = ibmvfc_probe,
4930         .remove = ibmvfc_remove,
4931         .get_desired_dma = ibmvfc_get_desired_dma,
4932         .name = IBMVFC_NAME,
4933         .pm = &ibmvfc_pm_ops,
4934 };
4935 
4936 static struct fc_function_template ibmvfc_transport_functions = {
4937         .show_host_fabric_name = 1,
4938         .show_host_node_name = 1,
4939         .show_host_port_name = 1,
4940         .show_host_supported_classes = 1,
4941         .show_host_port_type = 1,
4942         .show_host_port_id = 1,
4943         .show_host_maxframe_size = 1,
4944 
4945         .get_host_port_state = ibmvfc_get_host_port_state,
4946         .show_host_port_state = 1,
4947 
4948         .get_host_speed = ibmvfc_get_host_speed,
4949         .show_host_speed = 1,
4950 
4951         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4952         .terminate_rport_io = ibmvfc_terminate_rport_io,
4953 
4954         .show_rport_maxframe_size = 1,
4955         .show_rport_supported_classes = 1,
4956 
4957         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4958         .show_rport_dev_loss_tmo = 1,
4959 
4960         .get_starget_node_name = ibmvfc_get_starget_node_name,
4961         .show_starget_node_name = 1,
4962 
4963         .get_starget_port_name = ibmvfc_get_starget_port_name,
4964         .show_starget_port_name = 1,
4965 
4966         .get_starget_port_id = ibmvfc_get_starget_port_id,
4967         .show_starget_port_id = 1,
4968 
4969         .bsg_request = ibmvfc_bsg_request,
4970         .bsg_timeout = ibmvfc_bsg_timeout,
4971 };
4972 
4973 /**
4974  * ibmvfc_module_init - Initialize the ibmvfc module
4975  *
4976  * Return value:
4977  *      0 on success / other on failure
4978  **/
4979 static int __init ibmvfc_module_init(void)
4980 {
4981         int rc;
4982 
4983         if (!firmware_has_feature(FW_FEATURE_VIO))
4984                 return -ENODEV;
4985 
4986         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4987                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4988 
4989         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4990         if (!ibmvfc_transport_template)
4991                 return -ENOMEM;
4992 
4993         rc = vio_register_driver(&ibmvfc_driver);
4994         if (rc)
4995                 fc_release_transport(ibmvfc_transport_template);
4996         return rc;
4997 }
4998 
4999 /**
5000  * ibmvfc_module_exit - Teardown the ibmvfc module
5001  *
5002  * Return value:
5003  *      nothing
5004  **/
5005 static void __exit ibmvfc_module_exit(void)
5006 {
5007         vio_unregister_driver(&ibmvfc_driver);
5008         fc_release_transport(ibmvfc_transport_template);
5009 }
5010 
5011 module_init(ibmvfc_module_init);
5012 module_exit(ibmvfc_module_exit);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/scsi/ibmvscsi/ibmvfc.c

DEFINITIONS
