scsi/ibmvscsi/ibmvfc.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
0004  *
0005  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
0006  *
0007  * Copyright (C) IBM Corporation, 2008
0008  */
0009
0010 #include <linux/module.h>
0011 #include <linux/moduleparam.h>
0012 #include <linux/dma-mapping.h>
0013 #include <linux/dmapool.h>
0014 #include <linux/delay.h>
0015 #include <linux/interrupt.h>
0016 #include <linux/irqdomain.h>
0017 #include <linux/kthread.h>
0018 #include <linux/slab.h>
0019 #include <linux/of.h>
0020 #include <linux/pm.h>
0021 #include <linux/stringify.h>
0022 #include <linux/bsg-lib.h>
0023 #include <asm/firmware.h>
0024 #include <asm/irq.h>
0025 #include <asm/rtas.h>
0026 #include <asm/vio.h>
0027 #include <scsi/scsi.h>
0028 #include <scsi/scsi_cmnd.h>
0029 #include <scsi/scsi_host.h>
0030 #include <scsi/scsi_device.h>
0031 #include <scsi/scsi_tcq.h>
0032 #include <scsi/scsi_transport_fc.h>
0033 #include <scsi/scsi_bsg_fc.h>
0034 #include "ibmvfc.h"
0035
0036 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
0037 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
0038 static u64 max_lun = IBMVFC_MAX_LUN;
0039 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
0040 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
0041 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
0042 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
0043 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
0044 static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
0045 static unsigned int mq_enabled = IBMVFC_MQ;
0046 static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES;
0047 static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS;
0048 static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ;
0049 static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M;
0050
0051 static LIST_HEAD(ibmvfc_head);
0052 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
0053 static struct scsi_transport_template *ibmvfc_transport_template;
0054
0055 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
0056 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
0057 MODULE_LICENSE("GPL");
0058 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
0059
0060 module_param_named(mq, mq_enabled, uint, S_IRUGO);
0061 MODULE_PARM_DESC(mq, "Enable multiqueue support. "
0062          "[Default=" __stringify(IBMVFC_MQ) "]");
0063 module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO);
0064 MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. "
0065          "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]");
0066 module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO);
0067 MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. "
0068          "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]");
0069 module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO);
0070 MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. "
0071          "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]");
0072 module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO);
0073 MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. "
0074          "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]");
0075
0076 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
0077 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
0078          "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
0079 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
0080 MODULE_PARM_DESC(default_timeout,
0081          "Default timeout in seconds for initialization and EH commands. "
0082          "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
0083 module_param_named(max_requests, max_requests, uint, S_IRUGO);
0084 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
0085          "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
0086 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
0087 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
0088          "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
0089 module_param_named(max_targets, max_targets, uint, S_IRUGO);
0090 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
0091          "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
0092 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
0093 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
0094          "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
0095 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
0096 MODULE_PARM_DESC(debug, "Enable driver debug information. "
0097          "[Default=" __stringify(IBMVFC_DEBUG) "]");
0098 module_param_named(log_level, log_level, uint, 0);
0099 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
0100          "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
0101 module_param_named(cls3_error, cls3_error, uint, 0);
0102 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
0103          "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
0104
0105 static const struct {
0106     u16 status;
0107     u16 error;
0108     u8 result;
0109     u8 retry;
0110     int log;
0111     char *name;
0112 } cmd_status [] = {
0113     { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
0114     { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
0115     { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
0116     { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
0117     { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
0118     { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
0119     { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
0120     { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
0121     { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
0122     { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
0123     { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
0124     { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
0125     { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
0126     { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
0127
0128     { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
0129     { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
0130     { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
0131     { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
0132     { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
0133     { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
0134     { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
0135     { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
0136     { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
0137     { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
0138
0139     { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
0140     { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
0141     { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
0142     { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
0143     { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
0144     { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
0145     { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
0146     { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
0147     { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
0148     { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
0149     { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
0150
0151     { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
0152     { IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
0153 };
0154
0155 static void ibmvfc_npiv_login(struct ibmvfc_host *);
0156 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
0157 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
0158 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
0159 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
0160 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *);
0161 static void ibmvfc_tgt_move_login(struct ibmvfc_target *);
0162
0163 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *);
0164 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *);
0165
0166 static const char *unknown_error = "unknown error";
0167
0168 static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba,
0169               unsigned long length, unsigned long *cookie,
0170               unsigned long *irq)
0171 {
0172     unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
0173     long rc;
0174
0175     rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length);
0176     *cookie = retbuf[0];
0177     *irq = retbuf[1];
0178
0179     return rc;
0180 }
0181
0182 static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags)
0183 {
0184     u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities);
0185
0186     return (host_caps & cap_flags) ? 1 : 0;
0187 }
0188
0189 static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost,
0190                            struct ibmvfc_cmd *vfc_cmd)
0191 {
0192     if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
0193         return &vfc_cmd->v2.iu;
0194     else
0195         return &vfc_cmd->v1.iu;
0196 }
0197
0198 static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost,
0199                          struct ibmvfc_cmd *vfc_cmd)
0200 {
0201     if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
0202         return &vfc_cmd->v2.rsp;
0203     else
0204         return &vfc_cmd->v1.rsp;
0205 }
0206
0207 #ifdef CONFIG_SCSI_IBMVFC_TRACE
0208 /**
0209  * ibmvfc_trc_start - Log a start trace entry
0210  * @evt:        ibmvfc event struct
0211  *
0212  **/
0213 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
0214 {
0215     struct ibmvfc_host *vhost = evt->vhost;
0216     struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
0217     struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
0218     struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
0219     struct ibmvfc_trace_entry *entry;
0220     int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
0221
0222     entry = &vhost->trace[index];
0223     entry->evt = evt;
0224     entry->time = jiffies;
0225     entry->fmt = evt->crq.format;
0226     entry->type = IBMVFC_TRC_START;
0227
0228     switch (entry->fmt) {
0229     case IBMVFC_CMD_FORMAT:
0230         entry->op_code = iu->cdb[0];
0231         entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
0232         entry->lun = scsilun_to_int(&iu->lun);
0233         entry->tmf_flags = iu->tmf_flags;
0234         entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len);
0235         break;
0236     case IBMVFC_MAD_FORMAT:
0237         entry->op_code = be32_to_cpu(mad->opcode);
0238         break;
0239     default:
0240         break;
0241     }
0242 }
0243
0244 /**
0245  * ibmvfc_trc_end - Log an end trace entry
0246  * @evt:        ibmvfc event struct
0247  *
0248  **/
0249 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
0250 {
0251     struct ibmvfc_host *vhost = evt->vhost;
0252     struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
0253     struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
0254     struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
0255     struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
0256     struct ibmvfc_trace_entry *entry;
0257     int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
0258
0259     entry = &vhost->trace[index];
0260     entry->evt = evt;
0261     entry->time = jiffies;
0262     entry->fmt = evt->crq.format;
0263     entry->type = IBMVFC_TRC_END;
0264
0265     switch (entry->fmt) {
0266     case IBMVFC_CMD_FORMAT:
0267         entry->op_code = iu->cdb[0];
0268         entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
0269         entry->lun = scsilun_to_int(&iu->lun);
0270         entry->tmf_flags = iu->tmf_flags;
0271         entry->u.end.status = be16_to_cpu(vfc_cmd->status);
0272         entry->u.end.error = be16_to_cpu(vfc_cmd->error);
0273         entry->u.end.fcp_rsp_flags = rsp->flags;
0274         entry->u.end.rsp_code = rsp->data.info.rsp_code;
0275         entry->u.end.scsi_status = rsp->scsi_status;
0276         break;
0277     case IBMVFC_MAD_FORMAT:
0278         entry->op_code = be32_to_cpu(mad->opcode);
0279         entry->u.end.status = be16_to_cpu(mad->status);
0280         break;
0281     default:
0282         break;
0283
0284     }
0285 }
0286
0287 #else
0288 #define ibmvfc_trc_start(evt) do { } while (0)
0289 #define ibmvfc_trc_end(evt) do { } while (0)
0290 #endif
0291
0292 /**
0293  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
0294  * @status:     status / error class
0295  * @error:      error
0296  *
0297  * Return value:
0298  *  index into cmd_status / -EINVAL on failure
0299  **/
0300 static int ibmvfc_get_err_index(u16 status, u16 error)
0301 {
0302     int i;
0303
0304     for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
0305         if ((cmd_status[i].status & status) == cmd_status[i].status &&
0306             cmd_status[i].error == error)
0307             return i;
0308
0309     return -EINVAL;
0310 }
0311
0312 /**
0313  * ibmvfc_get_cmd_error - Find the error description for the fcp response
0314  * @status:     status / error class
0315  * @error:      error
0316  *
0317  * Return value:
0318  *  error description string
0319  **/
0320 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
0321 {
0322     int rc = ibmvfc_get_err_index(status, error);
0323     if (rc >= 0)
0324         return cmd_status[rc].name;
0325     return unknown_error;
0326 }
0327
0328 /**
0329  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
0330  * @vhost:      ibmvfc host struct
0331  * @vfc_cmd:    ibmvfc command struct
0332  *
0333  * Return value:
0334  *  SCSI result value to return for completed command
0335  **/
0336 static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd)
0337 {
0338     int err;
0339     struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
0340     int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
0341
0342     if ((rsp->flags & FCP_RSP_LEN_VALID) &&
0343         ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
0344          rsp->data.info.rsp_code))
0345         return DID_ERROR << 16;
0346
0347     err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
0348     if (err >= 0)
0349         return rsp->scsi_status | (cmd_status[err].result << 16);
0350     return rsp->scsi_status | (DID_ERROR << 16);
0351 }
0352
0353 /**
0354  * ibmvfc_retry_cmd - Determine if error status is retryable
0355  * @status:     status / error class
0356  * @error:      error
0357  *
0358  * Return value:
0359  *  1 if error should be retried / 0 if it should not
0360  **/
0361 static int ibmvfc_retry_cmd(u16 status, u16 error)
0362 {
0363     int rc = ibmvfc_get_err_index(status, error);
0364
0365     if (rc >= 0)
0366         return cmd_status[rc].retry;
0367     return 1;
0368 }
0369
0370 static const char *unknown_fc_explain = "unknown fc explain";
0371
0372 static const struct {
0373     u16 fc_explain;
0374     char *name;
0375 } ls_explain [] = {
0376     { 0x00, "no additional explanation" },
0377     { 0x01, "service parameter error - options" },
0378     { 0x03, "service parameter error - initiator control" },
0379     { 0x05, "service parameter error - recipient control" },
0380     { 0x07, "service parameter error - received data field size" },
0381     { 0x09, "service parameter error - concurrent seq" },
0382     { 0x0B, "service parameter error - credit" },
0383     { 0x0D, "invalid N_Port/F_Port_Name" },
0384     { 0x0E, "invalid node/Fabric Name" },
0385     { 0x0F, "invalid common service parameters" },
0386     { 0x11, "invalid association header" },
0387     { 0x13, "association header required" },
0388     { 0x15, "invalid originator S_ID" },
0389     { 0x17, "invalid OX_ID-RX-ID combination" },
0390     { 0x19, "command (request) already in progress" },
0391     { 0x1E, "N_Port Login requested" },
0392     { 0x1F, "Invalid N_Port_ID" },
0393 };
0394
0395 static const struct {
0396     u16 fc_explain;
0397     char *name;
0398 } gs_explain [] = {
0399     { 0x00, "no additional explanation" },
0400     { 0x01, "port identifier not registered" },
0401     { 0x02, "port name not registered" },
0402     { 0x03, "node name not registered" },
0403     { 0x04, "class of service not registered" },
0404     { 0x06, "initial process associator not registered" },
0405     { 0x07, "FC-4 TYPEs not registered" },
0406     { 0x08, "symbolic port name not registered" },
0407     { 0x09, "symbolic node name not registered" },
0408     { 0x0A, "port type not registered" },
0409     { 0xF0, "authorization exception" },
0410     { 0xF1, "authentication exception" },
0411     { 0xF2, "data base full" },
0412     { 0xF3, "data base empty" },
0413     { 0xF4, "processing request" },
0414     { 0xF5, "unable to verify connection" },
0415     { 0xF6, "devices not in a common zone" },
0416 };
0417
0418 /**
0419  * ibmvfc_get_ls_explain - Return the FC Explain description text
0420  * @status: FC Explain status
0421  *
0422  * Returns:
0423  *  error string
0424  **/
0425 static const char *ibmvfc_get_ls_explain(u16 status)
0426 {
0427     int i;
0428
0429     for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
0430         if (ls_explain[i].fc_explain == status)
0431             return ls_explain[i].name;
0432
0433     return unknown_fc_explain;
0434 }
0435
0436 /**
0437  * ibmvfc_get_gs_explain - Return the FC Explain description text
0438  * @status: FC Explain status
0439  *
0440  * Returns:
0441  *  error string
0442  **/
0443 static const char *ibmvfc_get_gs_explain(u16 status)
0444 {
0445     int i;
0446
0447     for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
0448         if (gs_explain[i].fc_explain == status)
0449             return gs_explain[i].name;
0450
0451     return unknown_fc_explain;
0452 }
0453
0454 static const struct {
0455     enum ibmvfc_fc_type fc_type;
0456     char *name;
0457 } fc_type [] = {
0458     { IBMVFC_FABRIC_REJECT, "fabric reject" },
0459     { IBMVFC_PORT_REJECT, "port reject" },
0460     { IBMVFC_LS_REJECT, "ELS reject" },
0461     { IBMVFC_FABRIC_BUSY, "fabric busy" },
0462     { IBMVFC_PORT_BUSY, "port busy" },
0463     { IBMVFC_BASIC_REJECT, "basic reject" },
0464 };
0465
0466 static const char *unknown_fc_type = "unknown fc type";
0467
0468 /**
0469  * ibmvfc_get_fc_type - Return the FC Type description text
0470  * @status: FC Type error status
0471  *
0472  * Returns:
0473  *  error string
0474  **/
0475 static const char *ibmvfc_get_fc_type(u16 status)
0476 {
0477     int i;
0478
0479     for (i = 0; i < ARRAY_SIZE(fc_type); i++)
0480         if (fc_type[i].fc_type == status)
0481             return fc_type[i].name;
0482
0483     return unknown_fc_type;
0484 }
0485
0486 /**
0487  * ibmvfc_set_tgt_action - Set the next init action for the target
0488  * @tgt:        ibmvfc target struct
0489  * @action:     action to perform
0490  *
0491  * Returns:
0492  *  0 if action changed / non-zero if not changed
0493  **/
0494 static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
0495                   enum ibmvfc_target_action action)
0496 {
0497     int rc = -EINVAL;
0498
0499     switch (tgt->action) {
0500     case IBMVFC_TGT_ACTION_LOGOUT_RPORT:
0501         if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT ||
0502             action == IBMVFC_TGT_ACTION_DEL_RPORT) {
0503             tgt->action = action;
0504             rc = 0;
0505         }
0506         break;
0507     case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT:
0508         if (action == IBMVFC_TGT_ACTION_DEL_RPORT ||
0509             action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
0510             tgt->action = action;
0511             rc = 0;
0512         }
0513         break;
0514     case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT:
0515         if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
0516             tgt->action = action;
0517             rc = 0;
0518         }
0519         break;
0520     case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT:
0521         if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
0522             tgt->action = action;
0523             rc = 0;
0524         }
0525         break;
0526     case IBMVFC_TGT_ACTION_DEL_RPORT:
0527         if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
0528             tgt->action = action;
0529             rc = 0;
0530         }
0531         break;
0532     case IBMVFC_TGT_ACTION_DELETED_RPORT:
0533         break;
0534     default:
0535         tgt->action = action;
0536         rc = 0;
0537         break;
0538     }
0539
0540     if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT)
0541         tgt->add_rport = 0;
0542
0543     return rc;
0544 }
0545
0546 /**
0547  * ibmvfc_set_host_state - Set the state for the host
0548  * @vhost:      ibmvfc host struct
0549  * @state:      state to set host to
0550  *
0551  * Returns:
0552  *  0 if state changed / non-zero if not changed
0553  **/
0554 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
0555                   enum ibmvfc_host_state state)
0556 {
0557     int rc = 0;
0558
0559     switch (vhost->state) {
0560     case IBMVFC_HOST_OFFLINE:
0561         rc = -EINVAL;
0562         break;
0563     default:
0564         vhost->state = state;
0565         break;
0566     }
0567
0568     return rc;
0569 }
0570
0571 /**
0572  * ibmvfc_set_host_action - Set the next init action for the host
0573  * @vhost:      ibmvfc host struct
0574  * @action:     action to perform
0575  *
0576  **/
0577 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
0578                    enum ibmvfc_host_action action)
0579 {
0580     switch (action) {
0581     case IBMVFC_HOST_ACTION_ALLOC_TGTS:
0582         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
0583             vhost->action = action;
0584         break;
0585     case IBMVFC_HOST_ACTION_LOGO_WAIT:
0586         if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
0587             vhost->action = action;
0588         break;
0589     case IBMVFC_HOST_ACTION_INIT_WAIT:
0590         if (vhost->action == IBMVFC_HOST_ACTION_INIT)
0591             vhost->action = action;
0592         break;
0593     case IBMVFC_HOST_ACTION_QUERY:
0594         switch (vhost->action) {
0595         case IBMVFC_HOST_ACTION_INIT_WAIT:
0596         case IBMVFC_HOST_ACTION_NONE:
0597         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
0598             vhost->action = action;
0599             break;
0600         default:
0601             break;
0602         }
0603         break;
0604     case IBMVFC_HOST_ACTION_TGT_INIT:
0605         if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
0606             vhost->action = action;
0607         break;
0608     case IBMVFC_HOST_ACTION_REENABLE:
0609     case IBMVFC_HOST_ACTION_RESET:
0610         vhost->action = action;
0611         break;
0612     case IBMVFC_HOST_ACTION_INIT:
0613     case IBMVFC_HOST_ACTION_TGT_DEL:
0614     case IBMVFC_HOST_ACTION_LOGO:
0615     case IBMVFC_HOST_ACTION_QUERY_TGTS:
0616     case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
0617     case IBMVFC_HOST_ACTION_NONE:
0618     default:
0619         switch (vhost->action) {
0620         case IBMVFC_HOST_ACTION_RESET:
0621         case IBMVFC_HOST_ACTION_REENABLE:
0622             break;
0623         default:
0624             vhost->action = action;
0625             break;
0626         }
0627         break;
0628     }
0629 }
0630
0631 /**
0632  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
0633  * @vhost:      ibmvfc host struct
0634  *
0635  * Return value:
0636  *  nothing
0637  **/
0638 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
0639 {
0640     if (vhost->action == IBMVFC_HOST_ACTION_NONE &&
0641         vhost->state == IBMVFC_ACTIVE) {
0642         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
0643             scsi_block_requests(vhost->host);
0644             ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
0645         }
0646     } else
0647         vhost->reinit = 1;
0648
0649     wake_up(&vhost->work_wait_q);
0650 }
0651
0652 /**
0653  * ibmvfc_del_tgt - Schedule cleanup and removal of the target
0654  * @tgt:        ibmvfc target struct
0655  **/
0656 static void ibmvfc_del_tgt(struct ibmvfc_target *tgt)
0657 {
0658     if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) {
0659         tgt->job_step = ibmvfc_tgt_implicit_logout_and_del;
0660         tgt->init_retries = 0;
0661     }
0662     wake_up(&tgt->vhost->work_wait_q);
0663 }
0664
0665 /**
0666  * ibmvfc_link_down - Handle a link down event from the adapter
0667  * @vhost:  ibmvfc host struct
0668  * @state:  ibmvfc host state to enter
0669  *
0670  **/
0671 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
0672                  enum ibmvfc_host_state state)
0673 {
0674     struct ibmvfc_target *tgt;
0675
0676     ENTER;
0677     scsi_block_requests(vhost->host);
0678     list_for_each_entry(tgt, &vhost->targets, queue)
0679         ibmvfc_del_tgt(tgt);
0680     ibmvfc_set_host_state(vhost, state);
0681     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
0682     vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
0683     wake_up(&vhost->work_wait_q);
0684     LEAVE;
0685 }
0686
0687 /**
0688  * ibmvfc_init_host - Start host initialization
0689  * @vhost:      ibmvfc host struct
0690  *
0691  * Return value:
0692  *  nothing
0693  **/
0694 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
0695 {
0696     struct ibmvfc_target *tgt;
0697
0698     if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
0699         if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
0700             dev_err(vhost->dev,
0701                 "Host initialization retries exceeded. Taking adapter offline\n");
0702             ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
0703             return;
0704         }
0705     }
0706
0707     if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
0708         memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE);
0709         vhost->async_crq.cur = 0;
0710
0711         list_for_each_entry(tgt, &vhost->targets, queue)
0712             ibmvfc_del_tgt(tgt);
0713         scsi_block_requests(vhost->host);
0714         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
0715         vhost->job_step = ibmvfc_npiv_login;
0716         wake_up(&vhost->work_wait_q);
0717     }
0718 }
0719
0720 /**
0721  * ibmvfc_send_crq - Send a CRQ
0722  * @vhost:  ibmvfc host struct
0723  * @word1:  the first 64 bits of the data
0724  * @word2:  the second 64 bits of the data
0725  *
0726  * Return value:
0727  *  0 on success / other on failure
0728  **/
0729 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
0730 {
0731     struct vio_dev *vdev = to_vio_dev(vhost->dev);
0732     return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
0733 }
0734
0735 static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1,
0736                    u64 word2, u64 word3, u64 word4)
0737 {
0738     struct vio_dev *vdev = to_vio_dev(vhost->dev);
0739
0740     return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie,
0741                   word1, word2, word3, word4);
0742 }
0743
0744 /**
0745  * ibmvfc_send_crq_init - Send a CRQ init message
0746  * @vhost:  ibmvfc host struct
0747  *
0748  * Return value:
0749  *  0 on success / other on failure
0750  **/
0751 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
0752 {
0753     ibmvfc_dbg(vhost, "Sending CRQ init\n");
0754     return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
0755 }
0756
0757 /**
0758  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
0759  * @vhost:  ibmvfc host struct
0760  *
0761  * Return value:
0762  *  0 on success / other on failure
0763  **/
0764 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
0765 {
0766     ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
0767     return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
0768 }
0769
0770 /**
0771  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
0772  * @vhost:  ibmvfc host who owns the event pool
0773  * @queue:      ibmvfc queue struct
0774  * @size:       pool size
0775  *
0776  * Returns zero on success.
0777  **/
0778 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost,
0779                   struct ibmvfc_queue *queue,
0780                   unsigned int size)
0781 {
0782     int i;
0783     struct ibmvfc_event_pool *pool = &queue->evt_pool;
0784
0785     ENTER;
0786     if (!size)
0787         return 0;
0788
0789     pool->size = size;
0790     pool->events = kcalloc(size, sizeof(*pool->events), GFP_KERNEL);
0791     if (!pool->events)
0792         return -ENOMEM;
0793
0794     pool->iu_storage = dma_alloc_coherent(vhost->dev,
0795                           size * sizeof(*pool->iu_storage),
0796                           &pool->iu_token, 0);
0797
0798     if (!pool->iu_storage) {
0799         kfree(pool->events);
0800         return -ENOMEM;
0801     }
0802
0803     INIT_LIST_HEAD(&queue->sent);
0804     INIT_LIST_HEAD(&queue->free);
0805     spin_lock_init(&queue->l_lock);
0806
0807     for (i = 0; i < size; ++i) {
0808         struct ibmvfc_event *evt = &pool->events[i];
0809
0810         /*
0811          * evt->active states
0812          *  1 = in flight
0813          *  0 = being completed
0814          * -1 = free/freed
0815          */
0816         atomic_set(&evt->active, -1);
0817         atomic_set(&evt->free, 1);
0818         evt->crq.valid = 0x80;
0819         evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
0820         evt->xfer_iu = pool->iu_storage + i;
0821         evt->vhost = vhost;
0822         evt->queue = queue;
0823         evt->ext_list = NULL;
0824         list_add_tail(&evt->queue_list, &queue->free);
0825     }
0826
0827     LEAVE;
0828     return 0;
0829 }
0830
0831 /**
0832  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
0833  * @vhost:  ibmvfc host who owns the event pool
0834  * @queue:      ibmvfc queue struct
0835  *
0836  **/
0837 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost,
0838                    struct ibmvfc_queue *queue)
0839 {
0840     int i;
0841     struct ibmvfc_event_pool *pool = &queue->evt_pool;
0842
0843     ENTER;
0844     for (i = 0; i < pool->size; ++i) {
0845         list_del(&pool->events[i].queue_list);
0846         BUG_ON(atomic_read(&pool->events[i].free) != 1);
0847         if (pool->events[i].ext_list)
0848             dma_pool_free(vhost->sg_pool,
0849                       pool->events[i].ext_list,
0850                       pool->events[i].ext_list_token);
0851     }
0852
0853     kfree(pool->events);
0854     dma_free_coherent(vhost->dev,
0855               pool->size * sizeof(*pool->iu_storage),
0856               pool->iu_storage, pool->iu_token);
0857     LEAVE;
0858 }
0859
0860 /**
0861  * ibmvfc_free_queue - Deallocate queue
0862  * @vhost:  ibmvfc host struct
0863  * @queue:  ibmvfc queue struct
0864  *
0865  * Unmaps dma and deallocates page for messages
0866  **/
0867 static void ibmvfc_free_queue(struct ibmvfc_host *vhost,
0868                   struct ibmvfc_queue *queue)
0869 {
0870     struct device *dev = vhost->dev;
0871
0872     dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
0873     free_page((unsigned long)queue->msgs.handle);
0874     queue->msgs.handle = NULL;
0875
0876     ibmvfc_free_event_pool(vhost, queue);
0877 }
0878
0879 /**
0880  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
0881  * @vhost:  ibmvfc host struct
0882  *
0883  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
0884  * the crq with the hypervisor.
0885  **/
0886 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
0887 {
0888     long rc = 0;
0889     struct vio_dev *vdev = to_vio_dev(vhost->dev);
0890     struct ibmvfc_queue *crq = &vhost->crq;
0891
0892     ibmvfc_dbg(vhost, "Releasing CRQ\n");
0893     free_irq(vdev->irq, vhost);
0894     tasklet_kill(&vhost->tasklet);
0895     do {
0896         if (rc)
0897             msleep(100);
0898         rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
0899     } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
0900
0901     vhost->state = IBMVFC_NO_CRQ;
0902     vhost->logged_in = 0;
0903
0904     ibmvfc_free_queue(vhost, crq);
0905 }
0906
0907 /**
0908  * ibmvfc_reenable_crq_queue - reenables the CRQ
0909  * @vhost:  ibmvfc host struct
0910  *
0911  * Return value:
0912  *  0 on success / other on failure
0913  **/
0914 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
0915 {
0916     int rc = 0;
0917     struct vio_dev *vdev = to_vio_dev(vhost->dev);
0918     unsigned long flags;
0919
0920     ibmvfc_dereg_sub_crqs(vhost);
0921
0922     /* Re-enable the CRQ */
0923     do {
0924         if (rc)
0925             msleep(100);
0926         rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
0927     } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
0928
0929     if (rc)
0930         dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
0931
0932     spin_lock_irqsave(vhost->host->host_lock, flags);
0933     spin_lock(vhost->crq.q_lock);
0934     vhost->do_enquiry = 1;
0935     vhost->using_channels = 0;
0936     spin_unlock(vhost->crq.q_lock);
0937     spin_unlock_irqrestore(vhost->host->host_lock, flags);
0938
0939     ibmvfc_reg_sub_crqs(vhost);
0940
0941     return rc;
0942 }
0943
0944 /**
0945  * ibmvfc_reset_crq - resets a crq after a failure
0946  * @vhost:  ibmvfc host struct
0947  *
0948  * Return value:
0949  *  0 on success / other on failure
0950  **/
0951 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
0952 {
0953     int rc = 0;
0954     unsigned long flags;
0955     struct vio_dev *vdev = to_vio_dev(vhost->dev);
0956     struct ibmvfc_queue *crq = &vhost->crq;
0957
0958     ibmvfc_dereg_sub_crqs(vhost);
0959
0960     /* Close the CRQ */
0961     do {
0962         if (rc)
0963             msleep(100);
0964         rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
0965     } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
0966
0967     spin_lock_irqsave(vhost->host->host_lock, flags);
0968     spin_lock(vhost->crq.q_lock);
0969     vhost->state = IBMVFC_NO_CRQ;
0970     vhost->logged_in = 0;
0971     vhost->do_enquiry = 1;
0972     vhost->using_channels = 0;
0973
0974     /* Clean out the queue */
0975     memset(crq->msgs.crq, 0, PAGE_SIZE);
0976     crq->cur = 0;
0977
0978     /* And re-open it again */
0979     rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
0980                 crq->msg_token, PAGE_SIZE);
0981
0982     if (rc == H_CLOSED)
0983         /* Adapter is good, but other end is not ready */
0984         dev_warn(vhost->dev, "Partner adapter not ready\n");
0985     else if (rc != 0)
0986         dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
0987
0988     spin_unlock(vhost->crq.q_lock);
0989     spin_unlock_irqrestore(vhost->host->host_lock, flags);
0990
0991     ibmvfc_reg_sub_crqs(vhost);
0992
0993     return rc;
0994 }
0995
0996 /**
0997  * ibmvfc_valid_event - Determines if event is valid.
0998  * @pool:   event_pool that contains the event
0999  * @evt:    ibmvfc event to be checked for validity
1000  *
1001  * Return value:
1002  *  1 if event is valid / 0 if event is not valid
1003  **/
1004 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
1005                   struct ibmvfc_event *evt)
1006 {
1007     int index = evt - pool->events;
1008     if (index < 0 || index >= pool->size)   /* outside of bounds */
1009         return 0;
1010     if (evt != pool->events + index)    /* unaligned */
1011         return 0;
1012     return 1;
1013 }
1014
1015 /**
1016  * ibmvfc_free_event - Free the specified event
1017  * @evt:    ibmvfc_event to be freed
1018  *
1019  **/
1020 static void ibmvfc_free_event(struct ibmvfc_event *evt)
1021 {
1022     struct ibmvfc_event_pool *pool = &evt->queue->evt_pool;
1023     unsigned long flags;
1024
1025     BUG_ON(!ibmvfc_valid_event(pool, evt));
1026     BUG_ON(atomic_inc_return(&evt->free) != 1);
1027     BUG_ON(atomic_dec_and_test(&evt->active));
1028
1029     spin_lock_irqsave(&evt->queue->l_lock, flags);
1030     list_add_tail(&evt->queue_list, &evt->queue->free);
1031     if (evt->eh_comp)
1032         complete(evt->eh_comp);
1033     spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1034 }
1035
1036 /**
1037  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
1038  * @evt:    ibmvfc event struct
1039  *
1040  * This function does not setup any error status, that must be done
1041  * before this function gets called.
1042  **/
1043 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
1044 {
1045     struct scsi_cmnd *cmnd = evt->cmnd;
1046
1047     if (cmnd) {
1048         scsi_dma_unmap(cmnd);
1049         scsi_done(cmnd);
1050     }
1051
1052     ibmvfc_free_event(evt);
1053 }
1054
1055 /**
1056  * ibmvfc_complete_purge - Complete failed command list
1057  * @purge_list:     list head of failed commands
1058  *
1059  * This function runs completions on commands to fail as a result of a
1060  * host reset or platform migration.
1061  **/
1062 static void ibmvfc_complete_purge(struct list_head *purge_list)
1063 {
1064     struct ibmvfc_event *evt, *pos;
1065
1066     list_for_each_entry_safe(evt, pos, purge_list, queue_list) {
1067         list_del(&evt->queue_list);
1068         ibmvfc_trc_end(evt);
1069         evt->done(evt);
1070     }
1071 }
1072
1073 /**
1074  * ibmvfc_fail_request - Fail request with specified error code
1075  * @evt:        ibmvfc event struct
1076  * @error_code: error code to fail request with
1077  *
1078  * Return value:
1079  *  none
1080  **/
1081 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
1082 {
1083     /*
1084      * Anything we are failing should still be active. Otherwise, it
1085      * implies we already got a response for the command and are doing
1086      * something bad like double completing it.
1087      */
1088     BUG_ON(!atomic_dec_and_test(&evt->active));
1089     if (evt->cmnd) {
1090         evt->cmnd->result = (error_code << 16);
1091         evt->done = ibmvfc_scsi_eh_done;
1092     } else
1093         evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
1094
1095     del_timer(&evt->timer);
1096 }
1097
1098 /**
1099  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
1100  * @vhost:      ibmvfc host struct
1101  * @error_code: error code to fail requests with
1102  *
1103  * Return value:
1104  *  none
1105  **/
1106 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
1107 {
1108     struct ibmvfc_event *evt, *pos;
1109     struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
1110     unsigned long flags;
1111     int hwqs = 0;
1112     int i;
1113
1114     if (vhost->using_channels)
1115         hwqs = vhost->scsi_scrqs.active_queues;
1116
1117     ibmvfc_dbg(vhost, "Purging all requests\n");
1118     spin_lock_irqsave(&vhost->crq.l_lock, flags);
1119     list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list)
1120         ibmvfc_fail_request(evt, error_code);
1121     list_splice_init(&vhost->crq.sent, &vhost->purge);
1122     spin_unlock_irqrestore(&vhost->crq.l_lock, flags);
1123
1124     for (i = 0; i < hwqs; i++) {
1125         spin_lock_irqsave(queues[i].q_lock, flags);
1126         spin_lock(&queues[i].l_lock);
1127         list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list)
1128             ibmvfc_fail_request(evt, error_code);
1129         list_splice_init(&queues[i].sent, &vhost->purge);
1130         spin_unlock(&queues[i].l_lock);
1131         spin_unlock_irqrestore(queues[i].q_lock, flags);
1132     }
1133 }
1134
1135 /**
1136  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
1137  * @vhost:  struct ibmvfc host to reset
1138  **/
1139 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
1140 {
1141     ibmvfc_purge_requests(vhost, DID_ERROR);
1142     ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
1143     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
1144 }
1145
1146 /**
1147  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
1148  * @vhost:  struct ibmvfc host to reset
1149  **/
1150 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
1151 {
1152     if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
1153         !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
1154         scsi_block_requests(vhost->host);
1155         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
1156         vhost->job_step = ibmvfc_npiv_logout;
1157         wake_up(&vhost->work_wait_q);
1158     } else
1159         ibmvfc_hard_reset_host(vhost);
1160 }
1161
1162 /**
1163  * ibmvfc_reset_host - Reset the connection to the server
1164  * @vhost:  ibmvfc host struct
1165  **/
1166 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
1167 {
1168     unsigned long flags;
1169
1170     spin_lock_irqsave(vhost->host->host_lock, flags);
1171     __ibmvfc_reset_host(vhost);
1172     spin_unlock_irqrestore(vhost->host->host_lock, flags);
1173 }
1174
1175 /**
1176  * ibmvfc_retry_host_init - Retry host initialization if allowed
1177  * @vhost:  ibmvfc host struct
1178  *
1179  * Returns: 1 if init will be retried / 0 if not
1180  *
1181  **/
1182 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
1183 {
1184     int retry = 0;
1185
1186     if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
1187         vhost->delay_init = 1;
1188         if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
1189             dev_err(vhost->dev,
1190                 "Host initialization retries exceeded. Taking adapter offline\n");
1191             ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
1192         } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
1193             __ibmvfc_reset_host(vhost);
1194         else {
1195             ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
1196             retry = 1;
1197         }
1198     }
1199
1200     wake_up(&vhost->work_wait_q);
1201     return retry;
1202 }
1203
1204 /**
1205  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
1206  * @starget:    scsi target struct
1207  *
1208  * Return value:
1209  *  ibmvfc_target struct / NULL if not found
1210  **/
1211 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
1212 {
1213     struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1214     struct ibmvfc_host *vhost = shost_priv(shost);
1215     struct ibmvfc_target *tgt;
1216
1217     list_for_each_entry(tgt, &vhost->targets, queue)
1218         if (tgt->target_id == starget->id) {
1219             kref_get(&tgt->kref);
1220             return tgt;
1221         }
1222     return NULL;
1223 }
1224
1225 /**
1226  * ibmvfc_get_target - Find the specified scsi_target
1227  * @starget:    scsi target struct
1228  *
1229  * Return value:
1230  *  ibmvfc_target struct / NULL if not found
1231  **/
1232 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
1233 {
1234     struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1235     struct ibmvfc_target *tgt;
1236     unsigned long flags;
1237
1238     spin_lock_irqsave(shost->host_lock, flags);
1239     tgt = __ibmvfc_get_target(starget);
1240     spin_unlock_irqrestore(shost->host_lock, flags);
1241     return tgt;
1242 }
1243
1244 /**
1245  * ibmvfc_get_host_speed - Get host port speed
1246  * @shost:      scsi host struct
1247  *
1248  * Return value:
1249  *  none
1250  **/
1251 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
1252 {
1253     struct ibmvfc_host *vhost = shost_priv(shost);
1254     unsigned long flags;
1255
1256     spin_lock_irqsave(shost->host_lock, flags);
1257     if (vhost->state == IBMVFC_ACTIVE) {
1258         switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
1259         case 1:
1260             fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
1261             break;
1262         case 2:
1263             fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
1264             break;
1265         case 4:
1266             fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
1267             break;
1268         case 8:
1269             fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
1270             break;
1271         case 10:
1272             fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
1273             break;
1274         case 16:
1275             fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
1276             break;
1277         default:
1278             ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
1279                    be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
1280             fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1281             break;
1282         }
1283     } else
1284         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1285     spin_unlock_irqrestore(shost->host_lock, flags);
1286 }
1287
1288 /**
1289  * ibmvfc_get_host_port_state - Get host port state
1290  * @shost:      scsi host struct
1291  *
1292  * Return value:
1293  *  none
1294  **/
1295 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1296 {
1297     struct ibmvfc_host *vhost = shost_priv(shost);
1298     unsigned long flags;
1299
1300     spin_lock_irqsave(shost->host_lock, flags);
1301     switch (vhost->state) {
1302     case IBMVFC_INITIALIZING:
1303     case IBMVFC_ACTIVE:
1304         fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1305         break;
1306     case IBMVFC_LINK_DOWN:
1307         fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1308         break;
1309     case IBMVFC_LINK_DEAD:
1310     case IBMVFC_HOST_OFFLINE:
1311         fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1312         break;
1313     case IBMVFC_HALTED:
1314         fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1315         break;
1316     case IBMVFC_NO_CRQ:
1317         fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1318         break;
1319     default:
1320         ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1321         fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1322         break;
1323     }
1324     spin_unlock_irqrestore(shost->host_lock, flags);
1325 }
1326
1327 /**
1328  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1329  * @rport:      rport struct
1330  * @timeout:    timeout value
1331  *
1332  * Return value:
1333  *  none
1334  **/
1335 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1336 {
1337     if (timeout)
1338         rport->dev_loss_tmo = timeout;
1339     else
1340         rport->dev_loss_tmo = 1;
1341 }
1342
1343 /**
1344  * ibmvfc_release_tgt - Free memory allocated for a target
1345  * @kref:       kref struct
1346  *
1347  **/
1348 static void ibmvfc_release_tgt(struct kref *kref)
1349 {
1350     struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1351     kfree(tgt);
1352 }
1353
1354 /**
1355  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1356  * @starget:    scsi target struct
1357  *
1358  * Return value:
1359  *  none
1360  **/
1361 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1362 {
1363     struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1364     fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1365     if (tgt)
1366         kref_put(&tgt->kref, ibmvfc_release_tgt);
1367 }
1368
1369 /**
1370  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1371  * @starget:    scsi target struct
1372  *
1373  * Return value:
1374  *  none
1375  **/
1376 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1377 {
1378     struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1379     fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1380     if (tgt)
1381         kref_put(&tgt->kref, ibmvfc_release_tgt);
1382 }
1383
1384 /**
1385  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1386  * @starget:    scsi target struct
1387  *
1388  * Return value:
1389  *  none
1390  **/
1391 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1392 {
1393     struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1394     fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1395     if (tgt)
1396         kref_put(&tgt->kref, ibmvfc_release_tgt);
1397 }
1398
1399 /**
1400  * ibmvfc_wait_while_resetting - Wait while the host resets
1401  * @vhost:      ibmvfc host struct
1402  *
1403  * Return value:
1404  *  0 on success / other on failure
1405  **/
1406 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1407 {
1408     long timeout = wait_event_timeout(vhost->init_wait_q,
1409                       ((vhost->state == IBMVFC_ACTIVE ||
1410                         vhost->state == IBMVFC_HOST_OFFLINE ||
1411                         vhost->state == IBMVFC_LINK_DEAD) &&
1412                        vhost->action == IBMVFC_HOST_ACTION_NONE),
1413                       (init_timeout * HZ));
1414
1415     return timeout ? 0 : -EIO;
1416 }
1417
1418 /**
1419  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1420  * @shost:      scsi host struct
1421  *
1422  * Return value:
1423  *  0 on success / other on failure
1424  **/
1425 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1426 {
1427     struct ibmvfc_host *vhost = shost_priv(shost);
1428
1429     dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1430     ibmvfc_reset_host(vhost);
1431     return ibmvfc_wait_while_resetting(vhost);
1432 }
1433
1434 /**
1435  * ibmvfc_gather_partition_info - Gather info about the LPAR
1436  * @vhost:      ibmvfc host struct
1437  *
1438  * Return value:
1439  *  none
1440  **/
1441 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1442 {
1443     struct device_node *rootdn;
1444     const char *name;
1445     const unsigned int *num;
1446
1447     rootdn = of_find_node_by_path("/");
1448     if (!rootdn)
1449         return;
1450
1451     name = of_get_property(rootdn, "ibm,partition-name", NULL);
1452     if (name)
1453         strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1454     num = of_get_property(rootdn, "ibm,partition-no", NULL);
1455     if (num)
1456         vhost->partition_number = *num;
1457     of_node_put(rootdn);
1458 }
1459
1460 /**
1461  * ibmvfc_set_login_info - Setup info for NPIV login
1462  * @vhost:  ibmvfc host struct
1463  *
1464  * Return value:
1465  *  none
1466  **/
1467 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1468 {
1469     struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1470     struct ibmvfc_queue *async_crq = &vhost->async_crq;
1471     struct device_node *of_node = vhost->dev->of_node;
1472     const char *location;
1473
1474     memset(login_info, 0, sizeof(*login_info));
1475
1476     login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1477     login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1478     login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1479     login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1480     login_info->partition_num = cpu_to_be32(vhost->partition_number);
1481     login_info->vfc_frame_version = cpu_to_be32(1);
1482     login_info->fcp_version = cpu_to_be16(3);
1483     login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1484     if (vhost->client_migrated)
1485         login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1486
1487     login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1488     login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN);
1489
1490     if (vhost->mq_enabled || vhost->using_channels)
1491         login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
1492
1493     login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1494     login_info->async.len = cpu_to_be32(async_crq->size *
1495                         sizeof(*async_crq->msgs.async));
1496     strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1497     strncpy(login_info->device_name,
1498         dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1499
1500     location = of_get_property(of_node, "ibm,loc-code", NULL);
1501     location = location ? location : dev_name(vhost->dev);
1502     strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1503 }
1504
1505 /**
1506  * ibmvfc_get_event - Gets the next free event in pool
1507  * @queue:      ibmvfc queue struct
1508  *
1509  * Returns a free event from the pool.
1510  **/
1511 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_queue *queue)
1512 {
1513     struct ibmvfc_event *evt;
1514     unsigned long flags;
1515
1516     spin_lock_irqsave(&queue->l_lock, flags);
1517     BUG_ON(list_empty(&queue->free));
1518     evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1519     atomic_set(&evt->free, 0);
1520     list_del(&evt->queue_list);
1521     spin_unlock_irqrestore(&queue->l_lock, flags);
1522     return evt;
1523 }
1524
1525 /**
1526  * ibmvfc_locked_done - Calls evt completion with host_lock held
1527  * @evt:    ibmvfc evt to complete
1528  *
1529  * All non-scsi command completion callbacks have the expectation that the
1530  * host_lock is held. This callback is used by ibmvfc_init_event to wrap a
1531  * MAD evt with the host_lock.
1532  **/
1533 static void ibmvfc_locked_done(struct ibmvfc_event *evt)
1534 {
1535     unsigned long flags;
1536
1537     spin_lock_irqsave(evt->vhost->host->host_lock, flags);
1538     evt->_done(evt);
1539     spin_unlock_irqrestore(evt->vhost->host->host_lock, flags);
1540 }
1541
1542 /**
1543  * ibmvfc_init_event - Initialize fields in an event struct that are always
1544  *              required.
1545  * @evt:    The event
1546  * @done:   Routine to call when the event is responded to
1547  * @format: SRP or MAD format
1548  **/
1549 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1550                   void (*done) (struct ibmvfc_event *), u8 format)
1551 {
1552     evt->cmnd = NULL;
1553     evt->sync_iu = NULL;
1554     evt->eh_comp = NULL;
1555     evt->crq.format = format;
1556     if (format == IBMVFC_CMD_FORMAT)
1557         evt->done = done;
1558     else {
1559         evt->_done = done;
1560         evt->done = ibmvfc_locked_done;
1561     }
1562     evt->hwq = 0;
1563 }
1564
1565 /**
1566  * ibmvfc_map_sg_list - Initialize scatterlist
1567  * @scmd:   scsi command struct
1568  * @nseg:   number of scatterlist segments
1569  * @md: memory descriptor list to initialize
1570  **/
1571 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1572                    struct srp_direct_buf *md)
1573 {
1574     int i;
1575     struct scatterlist *sg;
1576
1577     scsi_for_each_sg(scmd, sg, nseg, i) {
1578         md[i].va = cpu_to_be64(sg_dma_address(sg));
1579         md[i].len = cpu_to_be32(sg_dma_len(sg));
1580         md[i].key = 0;
1581     }
1582 }
1583
1584 /**
1585  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields
1586  * @scmd:       struct scsi_cmnd with the scatterlist
1587  * @evt:        ibmvfc event struct
1588  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1589  * @dev:        device for which to map dma memory
1590  *
1591  * Returns:
1592  *  0 on success / non-zero on failure
1593  **/
1594 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1595                   struct ibmvfc_event *evt,
1596                   struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1597 {
1598
1599     int sg_mapped;
1600     struct srp_direct_buf *data = &vfc_cmd->ioba;
1601     struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1602     struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd);
1603
1604     if (cls3_error)
1605         vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1606
1607     sg_mapped = scsi_dma_map(scmd);
1608     if (!sg_mapped) {
1609         vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1610         return 0;
1611     } else if (unlikely(sg_mapped < 0)) {
1612         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1613             scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1614         return sg_mapped;
1615     }
1616
1617     if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1618         vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1619         iu->add_cdb_len |= IBMVFC_WRDATA;
1620     } else {
1621         vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1622         iu->add_cdb_len |= IBMVFC_RDDATA;
1623     }
1624
1625     if (sg_mapped == 1) {
1626         ibmvfc_map_sg_list(scmd, sg_mapped, data);
1627         return 0;
1628     }
1629
1630     vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1631
1632     if (!evt->ext_list) {
1633         evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1634                            &evt->ext_list_token);
1635
1636         if (!evt->ext_list) {
1637             scsi_dma_unmap(scmd);
1638             if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1639                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1640             return -ENOMEM;
1641         }
1642     }
1643
1644     ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1645
1646     data->va = cpu_to_be64(evt->ext_list_token);
1647     data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1648     data->key = 0;
1649     return 0;
1650 }
1651
1652 /**
1653  * ibmvfc_timeout - Internal command timeout handler
1654  * @t:  struct ibmvfc_event that timed out
1655  *
1656  * Called when an internally generated command times out
1657  **/
1658 static void ibmvfc_timeout(struct timer_list *t)
1659 {
1660     struct ibmvfc_event *evt = from_timer(evt, t, timer);
1661     struct ibmvfc_host *vhost = evt->vhost;
1662     dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1663     ibmvfc_reset_host(vhost);
1664 }
1665
1666 /**
1667  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1668  * @evt:        event to be sent
1669  * @vhost:      ibmvfc host struct
1670  * @timeout:    timeout in seconds - 0 means do not time command
1671  *
1672  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1673  **/
1674 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1675                  struct ibmvfc_host *vhost, unsigned long timeout)
1676 {
1677     __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1678     unsigned long flags;
1679     int rc;
1680
1681     /* Copy the IU into the transfer area */
1682     *evt->xfer_iu = evt->iu;
1683     if (evt->crq.format == IBMVFC_CMD_FORMAT)
1684         evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1685     else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1686         evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1687     else
1688         BUG();
1689
1690     timer_setup(&evt->timer, ibmvfc_timeout, 0);
1691
1692     if (timeout) {
1693         evt->timer.expires = jiffies + (timeout * HZ);
1694         add_timer(&evt->timer);
1695     }
1696
1697     spin_lock_irqsave(&evt->queue->l_lock, flags);
1698     list_add_tail(&evt->queue_list, &evt->queue->sent);
1699     atomic_set(&evt->active, 1);
1700
1701     mb();
1702
1703     if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT)
1704         rc = ibmvfc_send_sub_crq(vhost,
1705                      evt->queue->vios_cookie,
1706                      be64_to_cpu(crq_as_u64[0]),
1707                      be64_to_cpu(crq_as_u64[1]),
1708                      0, 0);
1709     else
1710         rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1711                      be64_to_cpu(crq_as_u64[1]));
1712
1713     if (rc) {
1714         atomic_set(&evt->active, 0);
1715         list_del(&evt->queue_list);
1716         spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1717         del_timer(&evt->timer);
1718
1719         /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1720          * Firmware will send a CRQ with a transport event (0xFF) to
1721          * tell this client what has happened to the transport. This
1722          * will be handled in ibmvfc_handle_crq()
1723          */
1724         if (rc == H_CLOSED) {
1725             if (printk_ratelimit())
1726                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1727             if (evt->cmnd)
1728                 scsi_dma_unmap(evt->cmnd);
1729             ibmvfc_free_event(evt);
1730             return SCSI_MLQUEUE_HOST_BUSY;
1731         }
1732
1733         dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1734         if (evt->cmnd) {
1735             evt->cmnd->result = DID_ERROR << 16;
1736             evt->done = ibmvfc_scsi_eh_done;
1737         } else
1738             evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1739
1740         evt->done(evt);
1741     } else {
1742         spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1743         ibmvfc_trc_start(evt);
1744     }
1745
1746     return 0;
1747 }
1748
1749 /**
1750  * ibmvfc_log_error - Log an error for the failed command if appropriate
1751  * @evt:    ibmvfc event to log
1752  *
1753  **/
1754 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1755 {
1756     struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1757     struct ibmvfc_host *vhost = evt->vhost;
1758     struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1759     struct scsi_cmnd *cmnd = evt->cmnd;
1760     const char *err = unknown_error;
1761     int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1762     int logerr = 0;
1763     int rsp_code = 0;
1764
1765     if (index >= 0) {
1766         logerr = cmd_status[index].log;
1767         err = cmd_status[index].name;
1768     }
1769
1770     if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1771         return;
1772
1773     if (rsp->flags & FCP_RSP_LEN_VALID)
1774         rsp_code = rsp->data.info.rsp_code;
1775
1776     scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1777             "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1778             cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1779             rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1780 }
1781
1782 /**
1783  * ibmvfc_relogin - Log back into the specified device
1784  * @sdev:   scsi device struct
1785  *
1786  **/
1787 static void ibmvfc_relogin(struct scsi_device *sdev)
1788 {
1789     struct ibmvfc_host *vhost = shost_priv(sdev->host);
1790     struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1791     struct ibmvfc_target *tgt;
1792     unsigned long flags;
1793
1794     spin_lock_irqsave(vhost->host->host_lock, flags);
1795     list_for_each_entry(tgt, &vhost->targets, queue) {
1796         if (rport == tgt->rport) {
1797             ibmvfc_del_tgt(tgt);
1798             break;
1799         }
1800     }
1801
1802     ibmvfc_reinit_host(vhost);
1803     spin_unlock_irqrestore(vhost->host->host_lock, flags);
1804 }
1805
1806 /**
1807  * ibmvfc_scsi_done - Handle responses from commands
1808  * @evt:    ibmvfc event to be handled
1809  *
1810  * Used as a callback when sending scsi cmds.
1811  **/
1812 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1813 {
1814     struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1815     struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd);
1816     struct scsi_cmnd *cmnd = evt->cmnd;
1817     u32 rsp_len = 0;
1818     u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1819
1820     if (cmnd) {
1821         if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1822             scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1823         else if (rsp->flags & FCP_RESID_UNDER)
1824             scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1825         else
1826             scsi_set_resid(cmnd, 0);
1827
1828         if (vfc_cmd->status) {
1829             cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd);
1830
1831             if (rsp->flags & FCP_RSP_LEN_VALID)
1832                 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1833             if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1834                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1835             if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1836                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1837             if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1838                 (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1839                 ibmvfc_relogin(cmnd->device);
1840
1841             if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1842                 cmnd->result = (DID_ERROR << 16);
1843
1844             ibmvfc_log_error(evt);
1845         }
1846
1847         if (!cmnd->result &&
1848             (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1849             cmnd->result = (DID_ERROR << 16);
1850
1851         scsi_dma_unmap(cmnd);
1852         scsi_done(cmnd);
1853     }
1854
1855     ibmvfc_free_event(evt);
1856 }
1857
1858 /**
1859  * ibmvfc_host_chkready - Check if the host can accept commands
1860  * @vhost:   struct ibmvfc host
1861  *
1862  * Returns:
1863  *  1 if host can accept command / 0 if not
1864  **/
1865 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1866 {
1867     int result = 0;
1868
1869     switch (vhost->state) {
1870     case IBMVFC_LINK_DEAD:
1871     case IBMVFC_HOST_OFFLINE:
1872         result = DID_NO_CONNECT << 16;
1873         break;
1874     case IBMVFC_NO_CRQ:
1875     case IBMVFC_INITIALIZING:
1876     case IBMVFC_HALTED:
1877     case IBMVFC_LINK_DOWN:
1878         result = DID_REQUEUE << 16;
1879         break;
1880     case IBMVFC_ACTIVE:
1881         result = 0;
1882         break;
1883     }
1884
1885     return result;
1886 }
1887
1888 static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev)
1889 {
1890     struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1891     struct ibmvfc_host *vhost = evt->vhost;
1892     struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
1893     struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1894     struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1895     size_t offset;
1896
1897     memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1898     if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
1899         offset = offsetof(struct ibmvfc_cmd, v2.rsp);
1900         vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name);
1901     } else
1902         offset = offsetof(struct ibmvfc_cmd, v1.rsp);
1903     vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset);
1904     vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp));
1905     vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1906     vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu));
1907     vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp));
1908     vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1909     vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1910     int_to_scsilun(sdev->lun, &iu->lun);
1911
1912     return vfc_cmd;
1913 }
1914
1915 /**
1916  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1917  * @shost:  scsi host struct
1918  * @cmnd:   struct scsi_cmnd to be executed
1919  *
1920  * Returns:
1921  *  0 on success / other on failure
1922  **/
1923 static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
1924 {
1925     struct ibmvfc_host *vhost = shost_priv(shost);
1926     struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1927     struct ibmvfc_cmd *vfc_cmd;
1928     struct ibmvfc_fcp_cmd_iu *iu;
1929     struct ibmvfc_event *evt;
1930     u32 tag_and_hwq = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
1931     u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq);
1932     u16 scsi_channel;
1933     int rc;
1934
1935     if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1936         unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1937         cmnd->result = rc;
1938         scsi_done(cmnd);
1939         return 0;
1940     }
1941
1942     cmnd->result = (DID_OK << 16);
1943     if (vhost->using_channels) {
1944         scsi_channel = hwq % vhost->scsi_scrqs.active_queues;
1945         evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]);
1946         evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
1947     } else
1948         evt = ibmvfc_get_event(&vhost->crq);
1949
1950     ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1951     evt->cmnd = cmnd;
1952
1953     vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device);
1954     iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1955
1956     iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1957     memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
1958
1959     if (cmnd->flags & SCMD_TAGGED) {
1960         vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag);
1961         iu->pri_task_attr = IBMVFC_SIMPLE_TASK;
1962     }
1963
1964     vfc_cmd->correlation = cpu_to_be64((u64)evt);
1965
1966     if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1967         return ibmvfc_send_event(evt, vhost, 0);
1968
1969     ibmvfc_free_event(evt);
1970     if (rc == -ENOMEM)
1971         return SCSI_MLQUEUE_HOST_BUSY;
1972
1973     if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1974         scmd_printk(KERN_ERR, cmnd,
1975                 "Failed to map DMA buffer for command. rc=%d\n", rc);
1976
1977     cmnd->result = DID_ERROR << 16;
1978     scsi_done(cmnd);
1979     return 0;
1980 }
1981
1982 /**
1983  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1984  * @evt:    ibmvfc event struct
1985  *
1986  **/
1987 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1988 {
1989     /* copy the response back */
1990     if (evt->sync_iu)
1991         *evt->sync_iu = *evt->xfer_iu;
1992
1993     complete(&evt->comp);
1994 }
1995
1996 /**
1997  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1998  * @evt:    struct ibmvfc_event
1999  *
2000  **/
2001 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
2002 {
2003     struct ibmvfc_host *vhost = evt->vhost;
2004
2005     ibmvfc_free_event(evt);
2006     vhost->aborting_passthru = 0;
2007     dev_info(vhost->dev, "Passthru command cancelled\n");
2008 }
2009
2010 /**
2011  * ibmvfc_bsg_timeout - Handle a BSG timeout
2012  * @job:    struct bsg_job that timed out
2013  *
2014  * Returns:
2015  *  0 on success / other on failure
2016  **/
2017 static int ibmvfc_bsg_timeout(struct bsg_job *job)
2018 {
2019     struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2020     unsigned long port_id = (unsigned long)job->dd_data;
2021     struct ibmvfc_event *evt;
2022     struct ibmvfc_tmf *tmf;
2023     unsigned long flags;
2024     int rc;
2025
2026     ENTER;
2027     spin_lock_irqsave(vhost->host->host_lock, flags);
2028     if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
2029         __ibmvfc_reset_host(vhost);
2030         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2031         return 0;
2032     }
2033
2034     vhost->aborting_passthru = 1;
2035     evt = ibmvfc_get_event(&vhost->crq);
2036     ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
2037
2038     tmf = &evt->iu.tmf;
2039     memset(tmf, 0, sizeof(*tmf));
2040     tmf->common.version = cpu_to_be32(1);
2041     tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2042     tmf->common.length = cpu_to_be16(sizeof(*tmf));
2043     tmf->scsi_id = cpu_to_be64(port_id);
2044     tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2045     tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
2046     rc = ibmvfc_send_event(evt, vhost, default_timeout);
2047
2048     if (rc != 0) {
2049         vhost->aborting_passthru = 0;
2050         dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
2051         rc = -EIO;
2052     } else
2053         dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
2054              port_id);
2055
2056     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2057
2058     LEAVE;
2059     return rc;
2060 }
2061
2062 /**
2063  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
2064  * @vhost:      struct ibmvfc_host to send command
2065  * @port_id:    port ID to send command
2066  *
2067  * Returns:
2068  *  0 on success / other on failure
2069  **/
2070 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
2071 {
2072     struct ibmvfc_port_login *plogi;
2073     struct ibmvfc_target *tgt;
2074     struct ibmvfc_event *evt;
2075     union ibmvfc_iu rsp_iu;
2076     unsigned long flags;
2077     int rc = 0, issue_login = 1;
2078
2079     ENTER;
2080     spin_lock_irqsave(vhost->host->host_lock, flags);
2081     list_for_each_entry(tgt, &vhost->targets, queue) {
2082         if (tgt->scsi_id == port_id) {
2083             issue_login = 0;
2084             break;
2085         }
2086     }
2087
2088     if (!issue_login)
2089         goto unlock_out;
2090     if (unlikely((rc = ibmvfc_host_chkready(vhost))))
2091         goto unlock_out;
2092
2093     evt = ibmvfc_get_event(&vhost->crq);
2094     ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2095     plogi = &evt->iu.plogi;
2096     memset(plogi, 0, sizeof(*plogi));
2097     plogi->common.version = cpu_to_be32(1);
2098     plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
2099     plogi->common.length = cpu_to_be16(sizeof(*plogi));
2100     plogi->scsi_id = cpu_to_be64(port_id);
2101     evt->sync_iu = &rsp_iu;
2102     init_completion(&evt->comp);
2103
2104     rc = ibmvfc_send_event(evt, vhost, default_timeout);
2105     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2106
2107     if (rc)
2108         return -EIO;
2109
2110     wait_for_completion(&evt->comp);
2111
2112     if (rsp_iu.plogi.common.status)
2113         rc = -EIO;
2114
2115     spin_lock_irqsave(vhost->host->host_lock, flags);
2116     ibmvfc_free_event(evt);
2117 unlock_out:
2118     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2119     LEAVE;
2120     return rc;
2121 }
2122
2123 /**
2124  * ibmvfc_bsg_request - Handle a BSG request
2125  * @job:    struct bsg_job to be executed
2126  *
2127  * Returns:
2128  *  0 on success / other on failure
2129  **/
2130 static int ibmvfc_bsg_request(struct bsg_job *job)
2131 {
2132     struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2133     struct fc_rport *rport = fc_bsg_to_rport(job);
2134     struct ibmvfc_passthru_mad *mad;
2135     struct ibmvfc_event *evt;
2136     union ibmvfc_iu rsp_iu;
2137     unsigned long flags, port_id = -1;
2138     struct fc_bsg_request *bsg_request = job->request;
2139     struct fc_bsg_reply *bsg_reply = job->reply;
2140     unsigned int code = bsg_request->msgcode;
2141     int rc = 0, req_seg, rsp_seg, issue_login = 0;
2142     u32 fc_flags, rsp_len;
2143
2144     ENTER;
2145     bsg_reply->reply_payload_rcv_len = 0;
2146     if (rport)
2147         port_id = rport->port_id;
2148
2149     switch (code) {
2150     case FC_BSG_HST_ELS_NOLOGIN:
2151         port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
2152             (bsg_request->rqst_data.h_els.port_id[1] << 8) |
2153             bsg_request->rqst_data.h_els.port_id[2];
2154         fallthrough;
2155     case FC_BSG_RPT_ELS:
2156         fc_flags = IBMVFC_FC_ELS;
2157         break;
2158     case FC_BSG_HST_CT:
2159         issue_login = 1;
2160         port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
2161             (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
2162             bsg_request->rqst_data.h_ct.port_id[2];
2163         fallthrough;
2164     case FC_BSG_RPT_CT:
2165         fc_flags = IBMVFC_FC_CT_IU;
2166         break;
2167     default:
2168         return -ENOTSUPP;
2169     }
2170
2171     if (port_id == -1)
2172         return -EINVAL;
2173     if (!mutex_trylock(&vhost->passthru_mutex))
2174         return -EBUSY;
2175
2176     job->dd_data = (void *)port_id;
2177     req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
2178                  job->request_payload.sg_cnt, DMA_TO_DEVICE);
2179
2180     if (!req_seg) {
2181         mutex_unlock(&vhost->passthru_mutex);
2182         return -ENOMEM;
2183     }
2184
2185     rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
2186                  job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2187
2188     if (!rsp_seg) {
2189         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2190                  job->request_payload.sg_cnt, DMA_TO_DEVICE);
2191         mutex_unlock(&vhost->passthru_mutex);
2192         return -ENOMEM;
2193     }
2194
2195     if (req_seg > 1 || rsp_seg > 1) {
2196         rc = -EINVAL;
2197         goto out;
2198     }
2199
2200     if (issue_login)
2201         rc = ibmvfc_bsg_plogi(vhost, port_id);
2202
2203     spin_lock_irqsave(vhost->host->host_lock, flags);
2204
2205     if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
2206         unlikely((rc = ibmvfc_host_chkready(vhost)))) {
2207         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2208         goto out;
2209     }
2210
2211     evt = ibmvfc_get_event(&vhost->crq);
2212     ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2213     mad = &evt->iu.passthru;
2214
2215     memset(mad, 0, sizeof(*mad));
2216     mad->common.version = cpu_to_be32(1);
2217     mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
2218     mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
2219
2220     mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
2221         offsetof(struct ibmvfc_passthru_mad, iu));
2222     mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
2223
2224     mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
2225     mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
2226     mad->iu.flags = cpu_to_be32(fc_flags);
2227     mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2228
2229     mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
2230     mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
2231     mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
2232     mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
2233     mad->iu.scsi_id = cpu_to_be64(port_id);
2234     mad->iu.tag = cpu_to_be64((u64)evt);
2235     rsp_len = be32_to_cpu(mad->iu.rsp.len);
2236
2237     evt->sync_iu = &rsp_iu;
2238     init_completion(&evt->comp);
2239     rc = ibmvfc_send_event(evt, vhost, 0);
2240     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2241
2242     if (rc) {
2243         rc = -EIO;
2244         goto out;
2245     }
2246
2247     wait_for_completion(&evt->comp);
2248
2249     if (rsp_iu.passthru.common.status)
2250         rc = -EIO;
2251     else
2252         bsg_reply->reply_payload_rcv_len = rsp_len;
2253
2254     spin_lock_irqsave(vhost->host->host_lock, flags);
2255     ibmvfc_free_event(evt);
2256     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2257     bsg_reply->result = rc;
2258     bsg_job_done(job, bsg_reply->result,
2259                bsg_reply->reply_payload_rcv_len);
2260     rc = 0;
2261 out:
2262     dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2263              job->request_payload.sg_cnt, DMA_TO_DEVICE);
2264     dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
2265              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2266     mutex_unlock(&vhost->passthru_mutex);
2267     LEAVE;
2268     return rc;
2269 }
2270
2271 /**
2272  * ibmvfc_reset_device - Reset the device with the specified reset type
2273  * @sdev:   scsi device to reset
2274  * @type:   reset type
2275  * @desc:   reset type description for log messages
2276  *
2277  * Returns:
2278  *  0 on success / other on failure
2279  **/
2280 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
2281 {
2282     struct ibmvfc_host *vhost = shost_priv(sdev->host);
2283     struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2284     struct ibmvfc_cmd *tmf;
2285     struct ibmvfc_event *evt = NULL;
2286     union ibmvfc_iu rsp_iu;
2287     struct ibmvfc_fcp_cmd_iu *iu;
2288     struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2289     int rsp_rc = -EBUSY;
2290     unsigned long flags;
2291     int rsp_code = 0;
2292
2293     spin_lock_irqsave(vhost->host->host_lock, flags);
2294     if (vhost->state == IBMVFC_ACTIVE) {
2295         if (vhost->using_channels)
2296             evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]);
2297         else
2298             evt = ibmvfc_get_event(&vhost->crq);
2299
2300         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2301         tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2302         iu = ibmvfc_get_fcp_iu(vhost, tmf);
2303
2304         tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2305         if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2306             tmf->target_wwpn = cpu_to_be64(rport->port_name);
2307         iu->tmf_flags = type;
2308         evt->sync_iu = &rsp_iu;
2309
2310         init_completion(&evt->comp);
2311         rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2312     }
2313     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2314
2315     if (rsp_rc != 0) {
2316         sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2317                 desc, rsp_rc);
2318         return -EIO;
2319     }
2320
2321     sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2322     wait_for_completion(&evt->comp);
2323
2324     if (rsp_iu.cmd.status)
2325         rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2326
2327     if (rsp_code) {
2328         if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2329             rsp_code = fc_rsp->data.info.rsp_code;
2330
2331         sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2332                 "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2333                 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2334                 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2335                 fc_rsp->scsi_status);
2336         rsp_rc = -EIO;
2337     } else
2338         sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2339
2340     spin_lock_irqsave(vhost->host->host_lock, flags);
2341     ibmvfc_free_event(evt);
2342     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2343     return rsp_rc;
2344 }
2345
2346 /**
2347  * ibmvfc_match_rport - Match function for specified remote port
2348  * @evt:    ibmvfc event struct
2349  * @rport:  device to match
2350  *
2351  * Returns:
2352  *  1 if event matches rport / 0 if event does not match rport
2353  **/
2354 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2355 {
2356     struct fc_rport *cmd_rport;
2357
2358     if (evt->cmnd) {
2359         cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2360         if (cmd_rport == rport)
2361             return 1;
2362     }
2363     return 0;
2364 }
2365
2366 /**
2367  * ibmvfc_match_target - Match function for specified target
2368  * @evt:    ibmvfc event struct
2369  * @device: device to match (starget)
2370  *
2371  * Returns:
2372  *  1 if event matches starget / 0 if event does not match starget
2373  **/
2374 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2375 {
2376     if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2377         return 1;
2378     return 0;
2379 }
2380
2381 /**
2382  * ibmvfc_match_lun - Match function for specified LUN
2383  * @evt:    ibmvfc event struct
2384  * @device: device to match (sdev)
2385  *
2386  * Returns:
2387  *  1 if event matches sdev / 0 if event does not match sdev
2388  **/
2389 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2390 {
2391     if (evt->cmnd && evt->cmnd->device == device)
2392         return 1;
2393     return 0;
2394 }
2395
2396 /**
2397  * ibmvfc_event_is_free - Check if event is free or not
2398  * @evt:    ibmvfc event struct
2399  *
2400  * Returns:
2401  *  true / false
2402  **/
2403 static bool ibmvfc_event_is_free(struct ibmvfc_event *evt)
2404 {
2405     struct ibmvfc_event *loop_evt;
2406
2407     list_for_each_entry(loop_evt, &evt->queue->free, queue_list)
2408         if (loop_evt == evt)
2409             return true;
2410
2411     return false;
2412 }
2413
2414 /**
2415  * ibmvfc_wait_for_ops - Wait for ops to complete
2416  * @vhost:  ibmvfc host struct
2417  * @device: device to match (starget or sdev)
2418  * @match:  match function
2419  *
2420  * Returns:
2421  *  SUCCESS / FAILED
2422  **/
2423 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2424                    int (*match) (struct ibmvfc_event *, void *))
2425 {
2426     struct ibmvfc_event *evt;
2427     DECLARE_COMPLETION_ONSTACK(comp);
2428     int wait, i, q_index, q_size;
2429     unsigned long flags;
2430     signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2431     struct ibmvfc_queue *queues;
2432
2433     ENTER;
2434     if (vhost->mq_enabled && vhost->using_channels) {
2435         queues = vhost->scsi_scrqs.scrqs;
2436         q_size = vhost->scsi_scrqs.active_queues;
2437     } else {
2438         queues = &vhost->crq;
2439         q_size = 1;
2440     }
2441
2442     do {
2443         wait = 0;
2444         spin_lock_irqsave(vhost->host->host_lock, flags);
2445         for (q_index = 0; q_index < q_size; q_index++) {
2446             spin_lock(&queues[q_index].l_lock);
2447             for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2448                 evt = &queues[q_index].evt_pool.events[i];
2449                 if (!ibmvfc_event_is_free(evt)) {
2450                     if (match(evt, device)) {
2451                         evt->eh_comp = &comp;
2452                         wait++;
2453                     }
2454                 }
2455             }
2456             spin_unlock(&queues[q_index].l_lock);
2457         }
2458         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2459
2460         if (wait) {
2461             timeout = wait_for_completion_timeout(&comp, timeout);
2462
2463             if (!timeout) {
2464                 wait = 0;
2465                 spin_lock_irqsave(vhost->host->host_lock, flags);
2466                 for (q_index = 0; q_index < q_size; q_index++) {
2467                     spin_lock(&queues[q_index].l_lock);
2468                     for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2469                         evt = &queues[q_index].evt_pool.events[i];
2470                         if (!ibmvfc_event_is_free(evt)) {
2471                             if (match(evt, device)) {
2472                                 evt->eh_comp = NULL;
2473                                 wait++;
2474                             }
2475                         }
2476                     }
2477                     spin_unlock(&queues[q_index].l_lock);
2478                 }
2479                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2480                 if (wait)
2481                     dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2482                 LEAVE;
2483                 return wait ? FAILED : SUCCESS;
2484             }
2485         }
2486     } while (wait);
2487
2488     LEAVE;
2489     return SUCCESS;
2490 }
2491
2492 static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
2493                         struct scsi_device *sdev,
2494                         int type)
2495 {
2496     struct ibmvfc_host *vhost = shost_priv(sdev->host);
2497     struct scsi_target *starget = scsi_target(sdev);
2498     struct fc_rport *rport = starget_to_rport(starget);
2499     struct ibmvfc_event *evt;
2500     struct ibmvfc_tmf *tmf;
2501
2502     evt = ibmvfc_get_event(queue);
2503     ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2504
2505     tmf = &evt->iu.tmf;
2506     memset(tmf, 0, sizeof(*tmf));
2507     if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
2508         tmf->common.version = cpu_to_be32(2);
2509         tmf->target_wwpn = cpu_to_be64(rport->port_name);
2510     } else {
2511         tmf->common.version = cpu_to_be32(1);
2512     }
2513     tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2514     tmf->common.length = cpu_to_be16(sizeof(*tmf));
2515     tmf->scsi_id = cpu_to_be64(rport->port_id);
2516     int_to_scsilun(sdev->lun, &tmf->lun);
2517     if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
2518         type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2519     if (vhost->state == IBMVFC_ACTIVE)
2520         tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2521     else
2522         tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2523     tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2524     tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2525
2526     init_completion(&evt->comp);
2527
2528     return evt;
2529 }
2530
2531 static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type)
2532 {
2533     struct ibmvfc_host *vhost = shost_priv(sdev->host);
2534     struct ibmvfc_event *evt, *found_evt, *temp;
2535     struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
2536     unsigned long flags;
2537     int num_hwq, i;
2538     int fail = 0;
2539     LIST_HEAD(cancelq);
2540     u16 status;
2541
2542     ENTER;
2543     spin_lock_irqsave(vhost->host->host_lock, flags);
2544     num_hwq = vhost->scsi_scrqs.active_queues;
2545     for (i = 0; i < num_hwq; i++) {
2546         spin_lock(queues[i].q_lock);
2547         spin_lock(&queues[i].l_lock);
2548         found_evt = NULL;
2549         list_for_each_entry(evt, &queues[i].sent, queue_list) {
2550             if (evt->cmnd && evt->cmnd->device == sdev) {
2551                 found_evt = evt;
2552                 break;
2553             }
2554         }
2555         spin_unlock(&queues[i].l_lock);
2556
2557         if (found_evt && vhost->logged_in) {
2558             evt = ibmvfc_init_tmf(&queues[i], sdev, type);
2559             evt->sync_iu = &queues[i].cancel_rsp;
2560             ibmvfc_send_event(evt, vhost, default_timeout);
2561             list_add_tail(&evt->cancel, &cancelq);
2562         }
2563
2564         spin_unlock(queues[i].q_lock);
2565     }
2566     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2567
2568     if (list_empty(&cancelq)) {
2569         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2570             sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2571         return 0;
2572     }
2573
2574     sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2575
2576     list_for_each_entry_safe(evt, temp, &cancelq, cancel) {
2577         wait_for_completion(&evt->comp);
2578         status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status);
2579         list_del(&evt->cancel);
2580         ibmvfc_free_event(evt);
2581
2582         if (status != IBMVFC_MAD_SUCCESS) {
2583             sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2584             switch (status) {
2585             case IBMVFC_MAD_DRIVER_FAILED:
2586             case IBMVFC_MAD_CRQ_ERROR:
2587             /* Host adapter most likely going through reset, return success to
2588              * the caller will wait for the command being cancelled to get returned
2589              */
2590                 break;
2591             default:
2592                 fail = 1;
2593                 break;
2594             }
2595         }
2596     }
2597
2598     if (fail)
2599         return -EIO;
2600
2601     sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2602     LEAVE;
2603     return 0;
2604 }
2605
2606 static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type)
2607 {
2608     struct ibmvfc_host *vhost = shost_priv(sdev->host);
2609     struct ibmvfc_event *evt, *found_evt;
2610     union ibmvfc_iu rsp;
2611     int rsp_rc = -EBUSY;
2612     unsigned long flags;
2613     u16 status;
2614
2615     ENTER;
2616     found_evt = NULL;
2617     spin_lock_irqsave(vhost->host->host_lock, flags);
2618     spin_lock(&vhost->crq.l_lock);
2619     list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2620         if (evt->cmnd && evt->cmnd->device == sdev) {
2621             found_evt = evt;
2622             break;
2623         }
2624     }
2625     spin_unlock(&vhost->crq.l_lock);
2626
2627     if (!found_evt) {
2628         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2629             sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2630         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2631         return 0;
2632     }
2633
2634     if (vhost->logged_in) {
2635         evt = ibmvfc_init_tmf(&vhost->crq, sdev, type);
2636         evt->sync_iu = &rsp;
2637         rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2638     }
2639
2640     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2641
2642     if (rsp_rc != 0) {
2643         sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2644         /* If failure is received, the host adapter is most likely going
2645          through reset, return success so the caller will wait for the command
2646          being cancelled to get returned */
2647         return 0;
2648     }
2649
2650     sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2651
2652     wait_for_completion(&evt->comp);
2653     status = be16_to_cpu(rsp.mad_common.status);
2654     spin_lock_irqsave(vhost->host->host_lock, flags);
2655     ibmvfc_free_event(evt);
2656     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2657
2658     if (status != IBMVFC_MAD_SUCCESS) {
2659         sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2660         switch (status) {
2661         case IBMVFC_MAD_DRIVER_FAILED:
2662         case IBMVFC_MAD_CRQ_ERROR:
2663             /* Host adapter most likely going through reset, return success to
2664              the caller will wait for the command being cancelled to get returned */
2665             return 0;
2666         default:
2667             return -EIO;
2668         };
2669     }
2670
2671     sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2672     return 0;
2673 }
2674
2675 /**
2676  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2677  * @sdev:   scsi device to cancel commands
2678  * @type:   type of error recovery being performed
2679  *
2680  * This sends a cancel to the VIOS for the specified device. This does
2681  * NOT send any abort to the actual device. That must be done separately.
2682  *
2683  * Returns:
2684  *  0 on success / other on failure
2685  **/
2686 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2687 {
2688     struct ibmvfc_host *vhost = shost_priv(sdev->host);
2689
2690     if (vhost->mq_enabled && vhost->using_channels)
2691         return ibmvfc_cancel_all_mq(sdev, type);
2692     else
2693         return ibmvfc_cancel_all_sq(sdev, type);
2694 }
2695
2696 /**
2697  * ibmvfc_match_key - Match function for specified cancel key
2698  * @evt:    ibmvfc event struct
2699  * @key:    cancel key to match
2700  *
2701  * Returns:
2702  *  1 if event matches key / 0 if event does not match key
2703  **/
2704 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2705 {
2706     unsigned long cancel_key = (unsigned long)key;
2707
2708     if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2709         be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2710         return 1;
2711     return 0;
2712 }
2713
2714 /**
2715  * ibmvfc_match_evt - Match function for specified event
2716  * @evt:    ibmvfc event struct
2717  * @match:  event to match
2718  *
2719  * Returns:
2720  *  1 if event matches key / 0 if event does not match key
2721  **/
2722 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2723 {
2724     if (evt == match)
2725         return 1;
2726     return 0;
2727 }
2728
2729 /**
2730  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2731  * @sdev:   scsi device to abort commands
2732  *
2733  * This sends an Abort Task Set to the VIOS for the specified device. This does
2734  * NOT send any cancel to the VIOS. That must be done separately.
2735  *
2736  * Returns:
2737  *  0 on success / other on failure
2738  **/
2739 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2740 {
2741     struct ibmvfc_host *vhost = shost_priv(sdev->host);
2742     struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2743     struct ibmvfc_cmd *tmf;
2744     struct ibmvfc_event *evt, *found_evt;
2745     union ibmvfc_iu rsp_iu;
2746     struct ibmvfc_fcp_cmd_iu *iu;
2747     struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2748     int rc, rsp_rc = -EBUSY;
2749     unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2750     int rsp_code = 0;
2751
2752     found_evt = NULL;
2753     spin_lock_irqsave(vhost->host->host_lock, flags);
2754     spin_lock(&vhost->crq.l_lock);
2755     list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2756         if (evt->cmnd && evt->cmnd->device == sdev) {
2757             found_evt = evt;
2758             break;
2759         }
2760     }
2761     spin_unlock(&vhost->crq.l_lock);
2762
2763     if (!found_evt) {
2764         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2765             sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2766         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2767         return 0;
2768     }
2769
2770     if (vhost->state == IBMVFC_ACTIVE) {
2771         evt = ibmvfc_get_event(&vhost->crq);
2772         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2773         tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2774         iu = ibmvfc_get_fcp_iu(vhost, tmf);
2775
2776         if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2777             tmf->target_wwpn = cpu_to_be64(rport->port_name);
2778         iu->tmf_flags = IBMVFC_ABORT_TASK_SET;
2779         tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2780         evt->sync_iu = &rsp_iu;
2781
2782         tmf->correlation = cpu_to_be64((u64)evt);
2783
2784         init_completion(&evt->comp);
2785         rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2786     }
2787
2788     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2789
2790     if (rsp_rc != 0) {
2791         sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2792         return -EIO;
2793     }
2794
2795     sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2796     timeout = wait_for_completion_timeout(&evt->comp, timeout);
2797
2798     if (!timeout) {
2799         rc = ibmvfc_cancel_all(sdev, 0);
2800         if (!rc) {
2801             rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2802             if (rc == SUCCESS)
2803                 rc = 0;
2804         }
2805
2806         if (rc) {
2807             sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2808             ibmvfc_reset_host(vhost);
2809             rsp_rc = -EIO;
2810             rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2811
2812             if (rc == SUCCESS)
2813                 rsp_rc = 0;
2814
2815             rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2816             if (rc != SUCCESS) {
2817                 spin_lock_irqsave(vhost->host->host_lock, flags);
2818                 ibmvfc_hard_reset_host(vhost);
2819                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2820                 rsp_rc = 0;
2821             }
2822
2823             goto out;
2824         }
2825     }
2826
2827     if (rsp_iu.cmd.status)
2828         rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2829
2830     if (rsp_code) {
2831         if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2832             rsp_code = fc_rsp->data.info.rsp_code;
2833
2834         sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2835                 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2836                 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2837                 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2838                 fc_rsp->scsi_status);
2839         rsp_rc = -EIO;
2840     } else
2841         sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2842
2843 out:
2844     spin_lock_irqsave(vhost->host->host_lock, flags);
2845     ibmvfc_free_event(evt);
2846     spin_unlock_irqrestore(vhost->host->host_lock, flags);
2847     return rsp_rc;
2848 }
2849
2850 /**
2851  * ibmvfc_eh_abort_handler - Abort a command
2852  * @cmd:    scsi command to abort
2853  *
2854  * Returns:
2855  *  SUCCESS / FAST_IO_FAIL / FAILED
2856  **/
2857 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2858 {
2859     struct scsi_device *sdev = cmd->device;
2860     struct ibmvfc_host *vhost = shost_priv(sdev->host);
2861     int cancel_rc, block_rc;
2862     int rc = FAILED;
2863
2864     ENTER;
2865     block_rc = fc_block_scsi_eh(cmd);
2866     ibmvfc_wait_while_resetting(vhost);
2867     if (block_rc != FAST_IO_FAIL) {
2868         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2869         ibmvfc_abort_task_set(sdev);
2870     } else
2871         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2872
2873     if (!cancel_rc)
2874         rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2875
2876     if (block_rc == FAST_IO_FAIL && rc != FAILED)
2877         rc = FAST_IO_FAIL;
2878
2879     LEAVE;
2880     return rc;
2881 }
2882
2883 /**
2884  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2885  * @cmd:    scsi command struct
2886  *
2887  * Returns:
2888  *  SUCCESS / FAST_IO_FAIL / FAILED
2889  **/
2890 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2891 {
2892     struct scsi_device *sdev = cmd->device;
2893     struct ibmvfc_host *vhost = shost_priv(sdev->host);
2894     int cancel_rc, block_rc, reset_rc = 0;
2895     int rc = FAILED;
2896
2897     ENTER;
2898     block_rc = fc_block_scsi_eh(cmd);
2899     ibmvfc_wait_while_resetting(vhost);
2900     if (block_rc != FAST_IO_FAIL) {
2901         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2902         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2903     } else
2904         cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2905
2906     if (!cancel_rc && !reset_rc)
2907         rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2908
2909     if (block_rc == FAST_IO_FAIL && rc != FAILED)
2910         rc = FAST_IO_FAIL;
2911
2912     LEAVE;
2913     return rc;
2914 }
2915
2916 /**
2917  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2918  * @sdev:   scsi device struct
2919  * @data:   return code
2920  *
2921  **/
2922 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2923 {
2924     unsigned long *rc = data;
2925     *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2926 }
2927
2928 /**
2929  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2930  * @sdev:   scsi device struct
2931  * @data:   return code
2932  *
2933  **/
2934 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2935 {
2936     unsigned long *rc = data;
2937     *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2938 }
2939
2940 /**
2941  * ibmvfc_eh_target_reset_handler - Reset the target
2942  * @cmd:    scsi command struct
2943  *
2944  * Returns:
2945  *  SUCCESS / FAST_IO_FAIL / FAILED
2946  **/
2947 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2948 {
2949     struct scsi_device *sdev = cmd->device;
2950     struct ibmvfc_host *vhost = shost_priv(sdev->host);
2951     struct scsi_target *starget = scsi_target(sdev);
2952     int block_rc;
2953     int reset_rc = 0;
2954     int rc = FAILED;
2955     unsigned long cancel_rc = 0;
2956
2957     ENTER;
2958     block_rc = fc_block_scsi_eh(cmd);
2959     ibmvfc_wait_while_resetting(vhost);
2960     if (block_rc != FAST_IO_FAIL) {
2961         starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2962         reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2963     } else
2964         starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2965
2966     if (!cancel_rc && !reset_rc)
2967         rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2968
2969     if (block_rc == FAST_IO_FAIL && rc != FAILED)
2970         rc = FAST_IO_FAIL;
2971
2972     LEAVE;
2973     return rc;
2974 }
2975
2976 /**
2977  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2978  * @cmd:    struct scsi_cmnd having problems
2979  *
2980  **/
2981 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2982 {
2983     int rc;
2984     struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2985
2986     dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2987     rc = ibmvfc_issue_fc_host_lip(vhost->host);
2988
2989     return rc ? FAILED : SUCCESS;
2990 }
2991
2992 /**
2993  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2994  * @rport:      rport struct
2995  *
2996  * Return value:
2997  *  none
2998  **/
2999 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
3000 {
3001     struct Scsi_Host *shost = rport_to_shost(rport);
3002     struct ibmvfc_host *vhost = shost_priv(shost);
3003     struct fc_rport *dev_rport;
3004     struct scsi_device *sdev;
3005     struct ibmvfc_target *tgt;
3006     unsigned long rc, flags;
3007     unsigned int found;
3008
3009     ENTER;
3010     shost_for_each_device(sdev, shost) {
3011         dev_rport = starget_to_rport(scsi_target(sdev));
3012         if (dev_rport != rport)
3013             continue;
3014         ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3015     }
3016
3017     rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
3018
3019     if (rc == FAILED)
3020         ibmvfc_issue_fc_host_lip(shost);
3021
3022     spin_lock_irqsave(shost->host_lock, flags);
3023     found = 0;
3024     list_for_each_entry(tgt, &vhost->targets, queue) {
3025         if (tgt->scsi_id == rport->port_id) {
3026             found++;
3027             break;
3028         }
3029     }
3030
3031     if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
3032         /*
3033          * If we get here, that means we previously attempted to send
3034          * an implicit logout to the target but it failed, most likely
3035          * due to I/O being pending, so we need to send it again
3036          */
3037         ibmvfc_del_tgt(tgt);
3038         ibmvfc_reinit_host(vhost);
3039     }
3040
3041     spin_unlock_irqrestore(shost->host_lock, flags);
3042     LEAVE;
3043 }
3044
3045 static const struct ibmvfc_async_desc ae_desc [] = {
3046     { "PLOGI",  IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3047     { "LOGO",   IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3048     { "PRLO",   IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3049     { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3050     { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3051     { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
3052     { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
3053     { "Link Up",    IBMVFC_AE_LINK_UP,  IBMVFC_DEFAULT_LOG_LEVEL },
3054     { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
3055     { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
3056     { "Halt",   IBMVFC_AE_HALT,     IBMVFC_DEFAULT_LOG_LEVEL },
3057     { "Resume", IBMVFC_AE_RESUME,   IBMVFC_DEFAULT_LOG_LEVEL },
3058     { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
3059 };
3060
3061 static const struct ibmvfc_async_desc unknown_ae = {
3062     "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
3063 };
3064
3065 /**
3066  * ibmvfc_get_ae_desc - Get text description for async event
3067  * @ae: async event
3068  *
3069  **/
3070 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
3071 {
3072     int i;
3073
3074     for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
3075         if (ae_desc[i].ae == ae)
3076             return &ae_desc[i];
3077
3078     return &unknown_ae;
3079 }
3080
3081 static const struct {
3082     enum ibmvfc_ae_link_state state;
3083     const char *desc;
3084 } link_desc [] = {
3085     { IBMVFC_AE_LS_LINK_UP,     " link up" },
3086     { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
3087     { IBMVFC_AE_LS_LINK_DOWN,   " link down" },
3088     { IBMVFC_AE_LS_LINK_DEAD,   " link dead" },
3089 };
3090
3091 /**
3092  * ibmvfc_get_link_state - Get text description for link state
3093  * @state:  link state
3094  *
3095  **/
3096 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
3097 {
3098     int i;
3099
3100     for (i = 0; i < ARRAY_SIZE(link_desc); i++)
3101         if (link_desc[i].state == state)
3102             return link_desc[i].desc;
3103
3104     return "";
3105 }
3106
3107 /**
3108  * ibmvfc_handle_async - Handle an async event from the adapter
3109  * @crq:    crq to process
3110  * @vhost:  ibmvfc host struct
3111  *
3112  **/
3113 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
3114                 struct ibmvfc_host *vhost)
3115 {
3116     const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
3117     struct ibmvfc_target *tgt;
3118
3119     ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
3120            " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
3121            be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
3122            ibmvfc_get_link_state(crq->link_state));
3123
3124     switch (be64_to_cpu(crq->event)) {
3125     case IBMVFC_AE_RESUME:
3126         switch (crq->link_state) {
3127         case IBMVFC_AE_LS_LINK_DOWN:
3128             ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3129             break;
3130         case IBMVFC_AE_LS_LINK_DEAD:
3131             ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3132             break;
3133         case IBMVFC_AE_LS_LINK_UP:
3134         case IBMVFC_AE_LS_LINK_BOUNCED:
3135         default:
3136             vhost->events_to_log |= IBMVFC_AE_LINKUP;
3137             vhost->delay_init = 1;
3138             __ibmvfc_reset_host(vhost);
3139             break;
3140         }
3141
3142         break;
3143     case IBMVFC_AE_LINK_UP:
3144         vhost->events_to_log |= IBMVFC_AE_LINKUP;
3145         vhost->delay_init = 1;
3146         __ibmvfc_reset_host(vhost);
3147         break;
3148     case IBMVFC_AE_SCN_FABRIC:
3149     case IBMVFC_AE_SCN_DOMAIN:
3150         vhost->events_to_log |= IBMVFC_AE_RSCN;
3151         if (vhost->state < IBMVFC_HALTED) {
3152             vhost->delay_init = 1;
3153             __ibmvfc_reset_host(vhost);
3154         }
3155         break;
3156     case IBMVFC_AE_SCN_NPORT:
3157     case IBMVFC_AE_SCN_GROUP:
3158         vhost->events_to_log |= IBMVFC_AE_RSCN;
3159         ibmvfc_reinit_host(vhost);
3160         break;
3161     case IBMVFC_AE_ELS_LOGO:
3162     case IBMVFC_AE_ELS_PRLO:
3163     case IBMVFC_AE_ELS_PLOGI:
3164         list_for_each_entry(tgt, &vhost->targets, queue) {
3165             if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
3166                 break;
3167             if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
3168                 continue;
3169             if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
3170                 continue;
3171             if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
3172                 continue;
3173             if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
3174                 tgt->logo_rcvd = 1;
3175             if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
3176                 ibmvfc_del_tgt(tgt);
3177                 ibmvfc_reinit_host(vhost);
3178             }
3179         }
3180         break;
3181     case IBMVFC_AE_LINK_DOWN:
3182     case IBMVFC_AE_ADAPTER_FAILED:
3183         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3184         break;
3185     case IBMVFC_AE_LINK_DEAD:
3186         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3187         break;
3188     case IBMVFC_AE_HALT:
3189         ibmvfc_link_down(vhost, IBMVFC_HALTED);
3190         break;
3191     default:
3192         dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
3193         break;
3194     }
3195 }
3196
3197 /**
3198  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
3199  * @crq:    Command/Response queue
3200  * @vhost:  ibmvfc host struct
3201  * @evt_doneq:  Event done queue
3202  *
3203 **/
3204 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3205                   struct list_head *evt_doneq)
3206 {
3207     long rc;
3208     struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3209
3210     switch (crq->valid) {
3211     case IBMVFC_CRQ_INIT_RSP:
3212         switch (crq->format) {
3213         case IBMVFC_CRQ_INIT:
3214             dev_info(vhost->dev, "Partner initialized\n");
3215             /* Send back a response */
3216             rc = ibmvfc_send_crq_init_complete(vhost);
3217             if (rc == 0)
3218                 ibmvfc_init_host(vhost);
3219             else
3220                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
3221             break;
3222         case IBMVFC_CRQ_INIT_COMPLETE:
3223             dev_info(vhost->dev, "Partner initialization complete\n");
3224             ibmvfc_init_host(vhost);
3225             break;
3226         default:
3227             dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
3228         }
3229         return;
3230     case IBMVFC_CRQ_XPORT_EVENT:
3231         vhost->state = IBMVFC_NO_CRQ;
3232         vhost->logged_in = 0;
3233         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3234         if (crq->format == IBMVFC_PARTITION_MIGRATED) {
3235             /* We need to re-setup the interpartition connection */
3236             dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
3237             vhost->client_migrated = 1;
3238             ibmvfc_purge_requests(vhost, DID_REQUEUE);
3239             ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3240             ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
3241         } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
3242             dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
3243             ibmvfc_purge_requests(vhost, DID_ERROR);
3244             ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3245             ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
3246         } else {
3247             dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
3248         }
3249         return;
3250     case IBMVFC_CRQ_CMD_RSP:
3251         break;
3252     default:
3253         dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
3254         return;
3255     }
3256
3257     if (crq->format == IBMVFC_ASYNC_EVENT)
3258         return;
3259
3260     /* The only kind of payload CRQs we should get are responses to
3261      * things we send. Make sure this response is to something we
3262      * actually sent
3263      */
3264     if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) {
3265         dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3266             crq->ioba);
3267         return;
3268     }
3269
3270     if (unlikely(atomic_dec_if_positive(&evt->active))) {
3271         dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3272             crq->ioba);
3273         return;
3274     }
3275
3276     spin_lock(&evt->queue->l_lock);
3277     list_move_tail(&evt->queue_list, evt_doneq);
3278     spin_unlock(&evt->queue->l_lock);
3279 }
3280
3281 /**
3282  * ibmvfc_scan_finished - Check if the device scan is done.
3283  * @shost:  scsi host struct
3284  * @time:   current elapsed time
3285  *
3286  * Returns:
3287  *  0 if scan is not done / 1 if scan is done
3288  **/
3289 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
3290 {
3291     unsigned long flags;
3292     struct ibmvfc_host *vhost = shost_priv(shost);
3293     int done = 0;
3294
3295     spin_lock_irqsave(shost->host_lock, flags);
3296     if (!vhost->scan_timeout)
3297         done = 1;
3298     else if (time >= (vhost->scan_timeout * HZ)) {
3299         dev_info(vhost->dev, "Scan taking longer than %d seconds, "
3300              "continuing initialization\n", vhost->scan_timeout);
3301         done = 1;
3302     }
3303
3304     if (vhost->scan_complete) {
3305         vhost->scan_timeout = init_timeout;
3306         done = 1;
3307     }
3308     spin_unlock_irqrestore(shost->host_lock, flags);
3309     return done;
3310 }
3311
3312 /**
3313  * ibmvfc_slave_alloc - Setup the device's task set value
3314  * @sdev:   struct scsi_device device to configure
3315  *
3316  * Set the device's task set value so that error handling works as
3317  * expected.
3318  *
3319  * Returns:
3320  *  0 on success / -ENXIO if device does not exist
3321  **/
3322 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
3323 {
3324     struct Scsi_Host *shost = sdev->host;
3325     struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
3326     struct ibmvfc_host *vhost = shost_priv(shost);
3327     unsigned long flags = 0;
3328
3329     if (!rport || fc_remote_port_chkready(rport))
3330         return -ENXIO;
3331
3332     spin_lock_irqsave(shost->host_lock, flags);
3333     sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
3334     spin_unlock_irqrestore(shost->host_lock, flags);
3335     return 0;
3336 }
3337
3338 /**
3339  * ibmvfc_target_alloc - Setup the target's task set value
3340  * @starget:    struct scsi_target
3341  *
3342  * Set the target's task set value so that error handling works as
3343  * expected.
3344  *
3345  * Returns:
3346  *  0 on success / -ENXIO if device does not exist
3347  **/
3348 static int ibmvfc_target_alloc(struct scsi_target *starget)
3349 {
3350     struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3351     struct ibmvfc_host *vhost = shost_priv(shost);
3352     unsigned long flags = 0;
3353
3354     spin_lock_irqsave(shost->host_lock, flags);
3355     starget->hostdata = (void *)(unsigned long)vhost->task_set++;
3356     spin_unlock_irqrestore(shost->host_lock, flags);
3357     return 0;
3358 }
3359
3360 /**
3361  * ibmvfc_slave_configure - Configure the device
3362  * @sdev:   struct scsi_device device to configure
3363  *
3364  * Enable allow_restart for a device if it is a disk. Adjust the
3365  * queue_depth here also.
3366  *
3367  * Returns:
3368  *  0
3369  **/
3370 static int ibmvfc_slave_configure(struct scsi_device *sdev)
3371 {
3372     struct Scsi_Host *shost = sdev->host;
3373     unsigned long flags = 0;
3374
3375     spin_lock_irqsave(shost->host_lock, flags);
3376     if (sdev->type == TYPE_DISK) {
3377         sdev->allow_restart = 1;
3378         blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
3379     }
3380     spin_unlock_irqrestore(shost->host_lock, flags);
3381     return 0;
3382 }
3383
3384 /**
3385  * ibmvfc_change_queue_depth - Change the device's queue depth
3386  * @sdev:   scsi device struct
3387  * @qdepth: depth to set
3388  *
3389  * Return value:
3390  *  actual depth set
3391  **/
3392 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
3393 {
3394     if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
3395         qdepth = IBMVFC_MAX_CMDS_PER_LUN;
3396
3397     return scsi_change_queue_depth(sdev, qdepth);
3398 }
3399
3400 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
3401                          struct device_attribute *attr, char *buf)
3402 {
3403     struct Scsi_Host *shost = class_to_shost(dev);
3404     struct ibmvfc_host *vhost = shost_priv(shost);
3405
3406     return snprintf(buf, PAGE_SIZE, "%s\n",
3407             vhost->login_buf->resp.partition_name);
3408 }
3409
3410 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
3411                         struct device_attribute *attr, char *buf)
3412 {
3413     struct Scsi_Host *shost = class_to_shost(dev);
3414     struct ibmvfc_host *vhost = shost_priv(shost);
3415
3416     return snprintf(buf, PAGE_SIZE, "%s\n",
3417             vhost->login_buf->resp.device_name);
3418 }
3419
3420 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
3421                      struct device_attribute *attr, char *buf)
3422 {
3423     struct Scsi_Host *shost = class_to_shost(dev);
3424     struct ibmvfc_host *vhost = shost_priv(shost);
3425
3426     return snprintf(buf, PAGE_SIZE, "%s\n",
3427             vhost->login_buf->resp.port_loc_code);
3428 }
3429
3430 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
3431                      struct device_attribute *attr, char *buf)
3432 {
3433     struct Scsi_Host *shost = class_to_shost(dev);
3434     struct ibmvfc_host *vhost = shost_priv(shost);
3435
3436     return snprintf(buf, PAGE_SIZE, "%s\n",
3437             vhost->login_buf->resp.drc_name);
3438 }
3439
3440 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
3441                          struct device_attribute *attr, char *buf)
3442 {
3443     struct Scsi_Host *shost = class_to_shost(dev);
3444     struct ibmvfc_host *vhost = shost_priv(shost);
3445     return snprintf(buf, PAGE_SIZE, "%d\n", be32_to_cpu(vhost->login_buf->resp.version));
3446 }
3447
3448 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3449                          struct device_attribute *attr, char *buf)
3450 {
3451     struct Scsi_Host *shost = class_to_shost(dev);
3452     struct ibmvfc_host *vhost = shost_priv(shost);
3453     return snprintf(buf, PAGE_SIZE, "%llx\n", be64_to_cpu(vhost->login_buf->resp.capabilities));
3454 }
3455
3456 /**
3457  * ibmvfc_show_log_level - Show the adapter's error logging level
3458  * @dev:    class device struct
3459  * @attr:   unused
3460  * @buf:    buffer
3461  *
3462  * Return value:
3463  *  number of bytes printed to buffer
3464  **/
3465 static ssize_t ibmvfc_show_log_level(struct device *dev,
3466                      struct device_attribute *attr, char *buf)
3467 {
3468     struct Scsi_Host *shost = class_to_shost(dev);
3469     struct ibmvfc_host *vhost = shost_priv(shost);
3470     unsigned long flags = 0;
3471     int len;
3472
3473     spin_lock_irqsave(shost->host_lock, flags);
3474     len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
3475     spin_unlock_irqrestore(shost->host_lock, flags);
3476     return len;
3477 }
3478
3479 /**
3480  * ibmvfc_store_log_level - Change the adapter's error logging level
3481  * @dev:    class device struct
3482  * @attr:   unused
3483  * @buf:    buffer
3484  * @count:      buffer size
3485  *
3486  * Return value:
3487  *  number of bytes printed to buffer
3488  **/
3489 static ssize_t ibmvfc_store_log_level(struct device *dev,
3490                       struct device_attribute *attr,
3491                       const char *buf, size_t count)
3492 {
3493     struct Scsi_Host *shost = class_to_shost(dev);
3494     struct ibmvfc_host *vhost = shost_priv(shost);
3495     unsigned long flags = 0;
3496
3497     spin_lock_irqsave(shost->host_lock, flags);
3498     vhost->log_level = simple_strtoul(buf, NULL, 10);
3499     spin_unlock_irqrestore(shost->host_lock, flags);
3500     return strlen(buf);
3501 }
3502
3503 static ssize_t ibmvfc_show_scsi_channels(struct device *dev,
3504                      struct device_attribute *attr, char *buf)
3505 {
3506     struct Scsi_Host *shost = class_to_shost(dev);
3507     struct ibmvfc_host *vhost = shost_priv(shost);
3508     unsigned long flags = 0;
3509     int len;
3510
3511     spin_lock_irqsave(shost->host_lock, flags);
3512     len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->client_scsi_channels);
3513     spin_unlock_irqrestore(shost->host_lock, flags);
3514     return len;
3515 }
3516
3517 static ssize_t ibmvfc_store_scsi_channels(struct device *dev,
3518                      struct device_attribute *attr,
3519                      const char *buf, size_t count)
3520 {
3521     struct Scsi_Host *shost = class_to_shost(dev);
3522     struct ibmvfc_host *vhost = shost_priv(shost);
3523     unsigned long flags = 0;
3524     unsigned int channels;
3525
3526     spin_lock_irqsave(shost->host_lock, flags);
3527     channels = simple_strtoul(buf, NULL, 10);
3528     vhost->client_scsi_channels = min(channels, nr_scsi_hw_queues);
3529     ibmvfc_hard_reset_host(vhost);
3530     spin_unlock_irqrestore(shost->host_lock, flags);
3531     return strlen(buf);
3532 }
3533
3534 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3535 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3536 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3537 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3538 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3539 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3540 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3541            ibmvfc_show_log_level, ibmvfc_store_log_level);
3542 static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
3543            ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels);
3544
3545 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3546 /**
3547  * ibmvfc_read_trace - Dump the adapter trace
3548  * @filp:       open sysfs file
3549  * @kobj:       kobject struct
3550  * @bin_attr:   bin_attribute struct
3551  * @buf:        buffer
3552  * @off:        offset
3553  * @count:      buffer size
3554  *
3555  * Return value:
3556  *  number of bytes printed to buffer
3557  **/
3558 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3559                  struct bin_attribute *bin_attr,
3560                  char *buf, loff_t off, size_t count)
3561 {
3562     struct device *dev = kobj_to_dev(kobj);
3563     struct Scsi_Host *shost = class_to_shost(dev);
3564     struct ibmvfc_host *vhost = shost_priv(shost);
3565     unsigned long flags = 0;
3566     int size = IBMVFC_TRACE_SIZE;
3567     char *src = (char *)vhost->trace;
3568
3569     if (off > size)
3570         return 0;
3571     if (off + count > size) {
3572         size -= off;
3573         count = size;
3574     }
3575
3576     spin_lock_irqsave(shost->host_lock, flags);
3577     memcpy(buf, &src[off], count);
3578     spin_unlock_irqrestore(shost->host_lock, flags);
3579     return count;
3580 }
3581
3582 static struct bin_attribute ibmvfc_trace_attr = {
3583     .attr = {
3584         .name = "trace",
3585         .mode = S_IRUGO,
3586     },
3587     .size = 0,
3588     .read = ibmvfc_read_trace,
3589 };
3590 #endif
3591
3592 static struct attribute *ibmvfc_host_attrs[] = {
3593     &dev_attr_partition_name.attr,
3594     &dev_attr_device_name.attr,
3595     &dev_attr_port_loc_code.attr,
3596     &dev_attr_drc_name.attr,
3597     &dev_attr_npiv_version.attr,
3598     &dev_attr_capabilities.attr,
3599     &dev_attr_log_level.attr,
3600     &dev_attr_nr_scsi_channels.attr,
3601     NULL
3602 };
3603
3604 ATTRIBUTE_GROUPS(ibmvfc_host);
3605
3606 static struct scsi_host_template driver_template = {
3607     .module = THIS_MODULE,
3608     .name = "IBM POWER Virtual FC Adapter",
3609     .proc_name = IBMVFC_NAME,
3610     .queuecommand = ibmvfc_queuecommand,
3611     .eh_timed_out = fc_eh_timed_out,
3612     .eh_abort_handler = ibmvfc_eh_abort_handler,
3613     .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3614     .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3615     .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3616     .slave_alloc = ibmvfc_slave_alloc,
3617     .slave_configure = ibmvfc_slave_configure,
3618     .target_alloc = ibmvfc_target_alloc,
3619     .scan_finished = ibmvfc_scan_finished,
3620     .change_queue_depth = ibmvfc_change_queue_depth,
3621     .cmd_per_lun = 16,
3622     .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3623     .this_id = -1,
3624     .sg_tablesize = SG_ALL,
3625     .max_sectors = IBMVFC_MAX_SECTORS,
3626     .shost_groups = ibmvfc_host_groups,
3627     .track_queue_depth = 1,
3628     .host_tagset = 1,
3629 };
3630
3631 /**
3632  * ibmvfc_next_async_crq - Returns the next entry in async queue
3633  * @vhost:  ibmvfc host struct
3634  *
3635  * Returns:
3636  *  Pointer to next entry in queue / NULL if empty
3637  **/
3638 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3639 {
3640     struct ibmvfc_queue *async_crq = &vhost->async_crq;
3641     struct ibmvfc_async_crq *crq;
3642
3643     crq = &async_crq->msgs.async[async_crq->cur];
3644     if (crq->valid & 0x80) {
3645         if (++async_crq->cur == async_crq->size)
3646             async_crq->cur = 0;
3647         rmb();
3648     } else
3649         crq = NULL;
3650
3651     return crq;
3652 }
3653
3654 /**
3655  * ibmvfc_next_crq - Returns the next entry in message queue
3656  * @vhost:  ibmvfc host struct
3657  *
3658  * Returns:
3659  *  Pointer to next entry in queue / NULL if empty
3660  **/
3661 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3662 {
3663     struct ibmvfc_queue *queue = &vhost->crq;
3664     struct ibmvfc_crq *crq;
3665
3666     crq = &queue->msgs.crq[queue->cur];
3667     if (crq->valid & 0x80) {
3668         if (++queue->cur == queue->size)
3669             queue->cur = 0;
3670         rmb();
3671     } else
3672         crq = NULL;
3673
3674     return crq;
3675 }
3676
3677 /**
3678  * ibmvfc_interrupt - Interrupt handler
3679  * @irq:        number of irq to handle, not used
3680  * @dev_instance: ibmvfc_host that received interrupt
3681  *
3682  * Returns:
3683  *  IRQ_HANDLED
3684  **/
3685 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3686 {
3687     struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3688     unsigned long flags;
3689
3690     spin_lock_irqsave(vhost->host->host_lock, flags);
3691     vio_disable_interrupts(to_vio_dev(vhost->dev));
3692     tasklet_schedule(&vhost->tasklet);
3693     spin_unlock_irqrestore(vhost->host->host_lock, flags);
3694     return IRQ_HANDLED;
3695 }
3696
3697 /**
3698  * ibmvfc_tasklet - Interrupt handler tasklet
3699  * @data:       ibmvfc host struct
3700  *
3701  * Returns:
3702  *  Nothing
3703  **/
3704 static void ibmvfc_tasklet(void *data)
3705 {
3706     struct ibmvfc_host *vhost = data;
3707     struct vio_dev *vdev = to_vio_dev(vhost->dev);
3708     struct ibmvfc_crq *crq;
3709     struct ibmvfc_async_crq *async;
3710     struct ibmvfc_event *evt, *temp;
3711     unsigned long flags;
3712     int done = 0;
3713     LIST_HEAD(evt_doneq);
3714
3715     spin_lock_irqsave(vhost->host->host_lock, flags);
3716     spin_lock(vhost->crq.q_lock);
3717     while (!done) {
3718         /* Pull all the valid messages off the async CRQ */
3719         while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3720             ibmvfc_handle_async(async, vhost);
3721             async->valid = 0;
3722             wmb();
3723         }
3724
3725         /* Pull all the valid messages off the CRQ */
3726         while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3727             ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3728             crq->valid = 0;
3729             wmb();
3730         }
3731
3732         vio_enable_interrupts(vdev);
3733         if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3734             vio_disable_interrupts(vdev);
3735             ibmvfc_handle_async(async, vhost);
3736             async->valid = 0;
3737             wmb();
3738         } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3739             vio_disable_interrupts(vdev);
3740             ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3741             crq->valid = 0;
3742             wmb();
3743         } else
3744             done = 1;
3745     }
3746
3747     spin_unlock(vhost->crq.q_lock);
3748     spin_unlock_irqrestore(vhost->host->host_lock, flags);
3749
3750     list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3751         del_timer(&evt->timer);
3752         list_del(&evt->queue_list);
3753         ibmvfc_trc_end(evt);
3754         evt->done(evt);
3755     }
3756 }
3757
3758 static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
3759 {
3760     struct device *dev = scrq->vhost->dev;
3761     struct vio_dev *vdev = to_vio_dev(dev);
3762     unsigned long rc;
3763     int irq_action = H_ENABLE_VIO_INTERRUPT;
3764
3765     if (!enable)
3766         irq_action = H_DISABLE_VIO_INTERRUPT;
3767
3768     rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
3769                 scrq->hw_irq, 0, 0);
3770
3771     if (rc)
3772         dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
3773             enable ? "enable" : "disable", scrq->hwq_id, rc);
3774
3775     return rc;
3776 }
3777
3778 static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3779                    struct list_head *evt_doneq)
3780 {
3781     struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3782
3783     switch (crq->valid) {
3784     case IBMVFC_CRQ_CMD_RSP:
3785         break;
3786     case IBMVFC_CRQ_XPORT_EVENT:
3787         return;
3788     default:
3789         dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
3790         return;
3791     }
3792
3793     /* The only kind of payload CRQs we should get are responses to
3794      * things we send. Make sure this response is to something we
3795      * actually sent
3796      */
3797     if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
3798         dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3799             crq->ioba);
3800         return;
3801     }
3802
3803     if (unlikely(atomic_dec_if_positive(&evt->active))) {
3804         dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3805             crq->ioba);
3806         return;
3807     }
3808
3809     spin_lock(&evt->queue->l_lock);
3810     list_move_tail(&evt->queue_list, evt_doneq);
3811     spin_unlock(&evt->queue->l_lock);
3812 }
3813
3814 static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
3815 {
3816     struct ibmvfc_crq *crq;
3817
3818     crq = &scrq->msgs.scrq[scrq->cur].crq;
3819     if (crq->valid & 0x80) {
3820         if (++scrq->cur == scrq->size)
3821             scrq->cur = 0;
3822         rmb();
3823     } else
3824         crq = NULL;
3825
3826     return crq;
3827 }
3828
3829 static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
3830 {
3831     struct ibmvfc_crq *crq;
3832     struct ibmvfc_event *evt, *temp;
3833     unsigned long flags;
3834     int done = 0;
3835     LIST_HEAD(evt_doneq);
3836
3837     spin_lock_irqsave(scrq->q_lock, flags);
3838     while (!done) {
3839         while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3840             ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3841             crq->valid = 0;
3842             wmb();
3843         }
3844
3845         ibmvfc_toggle_scrq_irq(scrq, 1);
3846         if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3847             ibmvfc_toggle_scrq_irq(scrq, 0);
3848             ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3849             crq->valid = 0;
3850             wmb();
3851         } else
3852             done = 1;
3853     }
3854     spin_unlock_irqrestore(scrq->q_lock, flags);
3855
3856     list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3857         del_timer(&evt->timer);
3858         list_del(&evt->queue_list);
3859         ibmvfc_trc_end(evt);
3860         evt->done(evt);
3861     }
3862 }
3863
3864 static irqreturn_t ibmvfc_interrupt_scsi(int irq, void *scrq_instance)
3865 {
3866     struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance;
3867
3868     ibmvfc_toggle_scrq_irq(scrq, 0);
3869     ibmvfc_drain_sub_crq(scrq);
3870
3871     return IRQ_HANDLED;
3872 }
3873
3874 /**
3875  * ibmvfc_init_tgt - Set the next init job step for the target
3876  * @tgt:        ibmvfc target struct
3877  * @job_step:   job step to perform
3878  *
3879  **/
3880 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3881                 void (*job_step) (struct ibmvfc_target *))
3882 {
3883     if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT))
3884         tgt->job_step = job_step;
3885     wake_up(&tgt->vhost->work_wait_q);
3886 }
3887
3888 /**
3889  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3890  * @tgt:        ibmvfc target struct
3891  * @job_step:   initialization job step
3892  *
3893  * Returns: 1 if step will be retried / 0 if not
3894  *
3895  **/
3896 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3897                   void (*job_step) (struct ibmvfc_target *))
3898 {
3899     if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3900         ibmvfc_del_tgt(tgt);
3901         wake_up(&tgt->vhost->work_wait_q);
3902         return 0;
3903     } else
3904         ibmvfc_init_tgt(tgt, job_step);
3905     return 1;
3906 }
3907
3908 /* Defined in FC-LS */
3909 static const struct {
3910     int code;
3911     int retry;
3912     int logged_in;
3913 } prli_rsp [] = {
3914     { 0, 1, 0 },
3915     { 1, 0, 1 },
3916     { 2, 1, 0 },
3917     { 3, 1, 0 },
3918     { 4, 0, 0 },
3919     { 5, 0, 0 },
3920     { 6, 0, 1 },
3921     { 7, 0, 0 },
3922     { 8, 1, 0 },
3923 };
3924
3925 /**
3926  * ibmvfc_get_prli_rsp - Find PRLI response index
3927  * @flags:  PRLI response flags
3928  *
3929  **/
3930 static int ibmvfc_get_prli_rsp(u16 flags)
3931 {
3932     int i;
3933     int code = (flags & 0x0f00) >> 8;
3934
3935     for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3936         if (prli_rsp[i].code == code)
3937             return i;
3938
3939     return 0;
3940 }
3941
3942 /**
3943  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3944  * @evt:    ibmvfc event struct
3945  *
3946  **/
3947 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3948 {
3949     struct ibmvfc_target *tgt = evt->tgt;
3950     struct ibmvfc_host *vhost = evt->vhost;
3951     struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3952     struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3953     u32 status = be16_to_cpu(rsp->common.status);
3954     int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3955
3956     vhost->discovery_threads--;
3957     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3958     switch (status) {
3959     case IBMVFC_MAD_SUCCESS:
3960         tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3961             parms->type, parms->flags, parms->service_parms);
3962
3963         if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3964             index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3965             if (prli_rsp[index].logged_in) {
3966                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3967                     tgt->need_login = 0;
3968                     tgt->ids.roles = 0;
3969                     if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3970                         tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3971                     if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3972                         tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3973                     tgt->add_rport = 1;
3974                 } else
3975                     ibmvfc_del_tgt(tgt);
3976             } else if (prli_rsp[index].retry)
3977                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3978             else
3979                 ibmvfc_del_tgt(tgt);
3980         } else
3981             ibmvfc_del_tgt(tgt);
3982         break;
3983     case IBMVFC_MAD_DRIVER_FAILED:
3984         break;
3985     case IBMVFC_MAD_CRQ_ERROR:
3986         ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3987         break;
3988     case IBMVFC_MAD_FAILED:
3989     default:
3990         if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3991              be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3992             level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3993         else if (tgt->logo_rcvd)
3994             level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3995         else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3996             level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3997         else
3998             ibmvfc_del_tgt(tgt);
3999
4000         tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
4001             ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4002             be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
4003         break;
4004     }
4005
4006     kref_put(&tgt->kref, ibmvfc_release_tgt);
4007     ibmvfc_free_event(evt);
4008     wake_up(&vhost->work_wait_q);
4009 }
4010
4011 /**
4012  * ibmvfc_tgt_send_prli - Send a process login
4013  * @tgt:    ibmvfc target struct
4014  *
4015  **/
4016 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
4017 {
4018     struct ibmvfc_process_login *prli;
4019     struct ibmvfc_host *vhost = tgt->vhost;
4020     struct ibmvfc_event *evt;
4021
4022     if (vhost->discovery_threads >= disc_threads)
4023         return;
4024
4025     kref_get(&tgt->kref);
4026     evt = ibmvfc_get_event(&vhost->crq);
4027     vhost->discovery_threads++;
4028     ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
4029     evt->tgt = tgt;
4030     prli = &evt->iu.prli;
4031     memset(prli, 0, sizeof(*prli));
4032     if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4033         prli->common.version = cpu_to_be32(2);
4034         prli->target_wwpn = cpu_to_be64(tgt->wwpn);
4035     } else {
4036         prli->common.version = cpu_to_be32(1);
4037     }
4038     prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
4039     prli->common.length = cpu_to_be16(sizeof(*prli));
4040     prli->scsi_id = cpu_to_be64(tgt->scsi_id);
4041
4042     prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
4043     prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
4044     prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
4045     prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
4046
4047     if (cls3_error)
4048         prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
4049
4050     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4051     if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4052         vhost->discovery_threads--;
4053         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4054         kref_put(&tgt->kref, ibmvfc_release_tgt);
4055     } else
4056         tgt_dbg(tgt, "Sent process login\n");
4057 }
4058
4059 /**
4060  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
4061  * @evt:    ibmvfc event struct
4062  *
4063  **/
4064 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
4065 {
4066     struct ibmvfc_target *tgt = evt->tgt;
4067     struct ibmvfc_host *vhost = evt->vhost;
4068     struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
4069     u32 status = be16_to_cpu(rsp->common.status);
4070     int level = IBMVFC_DEFAULT_LOG_LEVEL;
4071
4072     vhost->discovery_threads--;
4073     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4074     switch (status) {
4075     case IBMVFC_MAD_SUCCESS:
4076         tgt_dbg(tgt, "Port Login succeeded\n");
4077         if (tgt->ids.port_name &&
4078             tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
4079             vhost->reinit = 1;
4080             tgt_dbg(tgt, "Port re-init required\n");
4081             break;
4082         }
4083         tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4084         tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4085         tgt->ids.port_id = tgt->scsi_id;
4086         memcpy(&tgt->service_parms, &rsp->service_parms,
4087                sizeof(tgt->service_parms));
4088         memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4089                sizeof(tgt->service_parms_change));
4090         ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4091         break;
4092     case IBMVFC_MAD_DRIVER_FAILED:
4093         break;
4094     case IBMVFC_MAD_CRQ_ERROR:
4095         ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4096         break;
4097     case IBMVFC_MAD_FAILED:
4098     default:
4099         if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4100             level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4101         else
4102             ibmvfc_del_tgt(tgt);
4103
4104         tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4105             ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4106                          be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4107             ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4108             ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
4109         break;
4110     }
4111
4112     kref_put(&tgt->kref, ibmvfc_release_tgt);
4113     ibmvfc_free_event(evt);
4114     wake_up(&vhost->work_wait_q);
4115 }
4116
4117 /**
4118  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
4119  * @tgt:    ibmvfc target struct
4120  *
4121  **/
4122 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
4123 {
4124     struct ibmvfc_port_login *plogi;
4125     struct ibmvfc_host *vhost = tgt->vhost;
4126     struct ibmvfc_event *evt;
4127
4128     if (vhost->discovery_threads >= disc_threads)
4129         return;
4130
4131     kref_get(&tgt->kref);
4132     tgt->logo_rcvd = 0;
4133     evt = ibmvfc_get_event(&vhost->crq);
4134     vhost->discovery_threads++;
4135     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4136     ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
4137     evt->tgt = tgt;
4138     plogi = &evt->iu.plogi;
4139     memset(plogi, 0, sizeof(*plogi));
4140     if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4141         plogi->common.version = cpu_to_be32(2);
4142         plogi->target_wwpn = cpu_to_be64(tgt->wwpn);
4143     } else {
4144         plogi->common.version = cpu_to_be32(1);
4145     }
4146     plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
4147     plogi->common.length = cpu_to_be16(sizeof(*plogi));
4148     plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
4149
4150     if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4151         vhost->discovery_threads--;
4152         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4153         kref_put(&tgt->kref, ibmvfc_release_tgt);
4154     } else
4155         tgt_dbg(tgt, "Sent port login\n");
4156 }
4157
4158 /**
4159  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
4160  * @evt:    ibmvfc event struct
4161  *
4162  **/
4163 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
4164 {
4165     struct ibmvfc_target *tgt = evt->tgt;
4166     struct ibmvfc_host *vhost = evt->vhost;
4167     struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
4168     u32 status = be16_to_cpu(rsp->common.status);
4169
4170     vhost->discovery_threads--;
4171     ibmvfc_free_event(evt);
4172     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4173
4174     switch (status) {
4175     case IBMVFC_MAD_SUCCESS:
4176         tgt_dbg(tgt, "Implicit Logout succeeded\n");
4177         break;
4178     case IBMVFC_MAD_DRIVER_FAILED:
4179         kref_put(&tgt->kref, ibmvfc_release_tgt);
4180         wake_up(&vhost->work_wait_q);
4181         return;
4182     case IBMVFC_MAD_FAILED:
4183     default:
4184         tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
4185         break;
4186     }
4187
4188     ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
4189     kref_put(&tgt->kref, ibmvfc_release_tgt);
4190     wake_up(&vhost->work_wait_q);
4191 }
4192
4193 /**
4194  * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout
4195  * @tgt:        ibmvfc target struct
4196  * @done:       Routine to call when the event is responded to
4197  *
4198  * Returns:
4199  *  Allocated and initialized ibmvfc_event struct
4200  **/
4201 static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt,
4202                                  void (*done) (struct ibmvfc_event *))
4203 {
4204     struct ibmvfc_implicit_logout *mad;
4205     struct ibmvfc_host *vhost = tgt->vhost;
4206     struct ibmvfc_event *evt;
4207
4208     kref_get(&tgt->kref);
4209     evt = ibmvfc_get_event(&vhost->crq);
4210     ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT);
4211     evt->tgt = tgt;
4212     mad = &evt->iu.implicit_logout;
4213     memset(mad, 0, sizeof(*mad));
4214     mad->common.version = cpu_to_be32(1);
4215     mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
4216     mad->common.length = cpu_to_be16(sizeof(*mad));
4217     mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4218     return evt;
4219 }
4220
4221 /**
4222  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
4223  * @tgt:        ibmvfc target struct
4224  *
4225  **/
4226 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
4227 {
4228     struct ibmvfc_host *vhost = tgt->vhost;
4229     struct ibmvfc_event *evt;
4230
4231     if (vhost->discovery_threads >= disc_threads)
4232         return;
4233
4234     vhost->discovery_threads++;
4235     evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4236                            ibmvfc_tgt_implicit_logout_done);
4237
4238     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4239     if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4240         vhost->discovery_threads--;
4241         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4242         kref_put(&tgt->kref, ibmvfc_release_tgt);
4243     } else
4244         tgt_dbg(tgt, "Sent Implicit Logout\n");
4245 }
4246
4247 /**
4248  * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD
4249  * @evt:    ibmvfc event struct
4250  *
4251  **/
4252 static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt)
4253 {
4254     struct ibmvfc_target *tgt = evt->tgt;
4255     struct ibmvfc_host *vhost = evt->vhost;
4256     struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4257     u32 status = be16_to_cpu(mad->common.status);
4258
4259     vhost->discovery_threads--;
4260     ibmvfc_free_event(evt);
4261
4262     /*
4263      * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the
4264      * driver in which case we need to free up all the targets. If we are
4265      * not unloading, we will still go through a hard reset to get out of
4266      * offline state, so there is no need to track the old targets in that
4267      * case.
4268      */
4269     if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE)
4270         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4271     else
4272         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT);
4273
4274     tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed");
4275     kref_put(&tgt->kref, ibmvfc_release_tgt);
4276     wake_up(&vhost->work_wait_q);
4277 }
4278
4279 /**
4280  * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target
4281  * @tgt:        ibmvfc target struct
4282  *
4283  **/
4284 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt)
4285 {
4286     struct ibmvfc_host *vhost = tgt->vhost;
4287     struct ibmvfc_event *evt;
4288
4289     if (!vhost->logged_in) {
4290         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4291         return;
4292     }
4293
4294     if (vhost->discovery_threads >= disc_threads)
4295         return;
4296
4297     vhost->discovery_threads++;
4298     evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4299                            ibmvfc_tgt_implicit_logout_and_del_done);
4300
4301     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT);
4302     if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4303         vhost->discovery_threads--;
4304         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4305         kref_put(&tgt->kref, ibmvfc_release_tgt);
4306     } else
4307         tgt_dbg(tgt, "Sent Implicit Logout\n");
4308 }
4309
4310 /**
4311  * ibmvfc_tgt_move_login_done - Completion handler for Move Login
4312  * @evt:    ibmvfc event struct
4313  *
4314  **/
4315 static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt)
4316 {
4317     struct ibmvfc_target *tgt = evt->tgt;
4318     struct ibmvfc_host *vhost = evt->vhost;
4319     struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login;
4320     u32 status = be16_to_cpu(rsp->common.status);
4321     int level = IBMVFC_DEFAULT_LOG_LEVEL;
4322
4323     vhost->discovery_threads--;
4324     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4325     switch (status) {
4326     case IBMVFC_MAD_SUCCESS:
4327         tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id);
4328         tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4329         tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4330         tgt->scsi_id = tgt->new_scsi_id;
4331         tgt->ids.port_id = tgt->scsi_id;
4332         memcpy(&tgt->service_parms, &rsp->service_parms,
4333                sizeof(tgt->service_parms));
4334         memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4335                sizeof(tgt->service_parms_change));
4336         ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4337         break;
4338     case IBMVFC_MAD_DRIVER_FAILED:
4339         break;
4340     case IBMVFC_MAD_CRQ_ERROR:
4341         ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4342         break;
4343     case IBMVFC_MAD_FAILED:
4344     default:
4345         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4346
4347         tgt_log(tgt, level,
4348             "Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n",
4349             tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags),
4350             status);
4351         break;
4352     }
4353
4354     kref_put(&tgt->kref, ibmvfc_release_tgt);
4355     ibmvfc_free_event(evt);
4356     wake_up(&vhost->work_wait_q);
4357 }
4358
4359
4360 /**
4361  * ibmvfc_tgt_move_login - Initiate a move login for specified target
4362  * @tgt:        ibmvfc target struct
4363  *
4364  **/
4365 static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt)
4366 {
4367     struct ibmvfc_host *vhost = tgt->vhost;
4368     struct ibmvfc_move_login *move;
4369     struct ibmvfc_event *evt;
4370
4371     if (vhost->discovery_threads >= disc_threads)
4372         return;
4373
4374     kref_get(&tgt->kref);
4375     evt = ibmvfc_get_event(&vhost->crq);
4376     vhost->discovery_threads++;
4377     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4378     ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT);
4379     evt->tgt = tgt;
4380     move = &evt->iu.move_login;
4381     memset(move, 0, sizeof(*move));
4382     move->common.version = cpu_to_be32(1);
4383     move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN);
4384     move->common.length = cpu_to_be16(sizeof(*move));
4385
4386     move->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4387     move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id);
4388     move->wwpn = cpu_to_be64(tgt->wwpn);
4389     move->node_name = cpu_to_be64(tgt->ids.node_name);
4390
4391     if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4392         vhost->discovery_threads--;
4393         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4394         kref_put(&tgt->kref, ibmvfc_release_tgt);
4395     } else
4396         tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id);
4397 }
4398
4399 /**
4400  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
4401  * @mad:    ibmvfc passthru mad struct
4402  * @tgt:    ibmvfc target struct
4403  *
4404  * Returns:
4405  *  1 if PLOGI needed / 0 if PLOGI not needed
4406  **/
4407 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
4408                     struct ibmvfc_target *tgt)
4409 {
4410     if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
4411         return 1;
4412     if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
4413         return 1;
4414     if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
4415         return 1;
4416     return 0;
4417 }
4418
4419 /**
4420  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
4421  * @evt:    ibmvfc event struct
4422  *
4423  **/
4424 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
4425 {
4426     struct ibmvfc_target *tgt = evt->tgt;
4427     struct ibmvfc_host *vhost = evt->vhost;
4428     struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4429     u32 status = be16_to_cpu(mad->common.status);
4430     u8 fc_reason, fc_explain;
4431
4432     vhost->discovery_threads--;
4433     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4434     del_timer(&tgt->timer);
4435
4436     switch (status) {
4437     case IBMVFC_MAD_SUCCESS:
4438         tgt_dbg(tgt, "ADISC succeeded\n");
4439         if (ibmvfc_adisc_needs_plogi(mad, tgt))
4440             ibmvfc_del_tgt(tgt);
4441         break;
4442     case IBMVFC_MAD_DRIVER_FAILED:
4443         break;
4444     case IBMVFC_MAD_FAILED:
4445     default:
4446         ibmvfc_del_tgt(tgt);
4447         fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
4448         fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
4449         tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4450              ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
4451              be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
4452              ibmvfc_get_fc_type(fc_reason), fc_reason,
4453              ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
4454         break;
4455     }
4456
4457     kref_put(&tgt->kref, ibmvfc_release_tgt);
4458     ibmvfc_free_event(evt);
4459     wake_up(&vhost->work_wait_q);
4460 }
4461
4462 /**
4463  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
4464  * @evt:        ibmvfc event struct
4465  *
4466  **/
4467 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
4468 {
4469     struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
4470
4471     memset(mad, 0, sizeof(*mad));
4472     mad->common.version = cpu_to_be32(1);
4473     mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
4474     mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
4475     mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4476         offsetof(struct ibmvfc_passthru_mad, iu));
4477     mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
4478     mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4479     mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
4480     mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4481         offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4482         offsetof(struct ibmvfc_passthru_fc_iu, payload));
4483     mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4484     mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4485         offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4486         offsetof(struct ibmvfc_passthru_fc_iu, response));
4487     mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
4488 }
4489
4490 /**
4491  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
4492  * @evt:        ibmvfc event struct
4493  *
4494  * Just cleanup this event struct. Everything else is handled by
4495  * the ADISC completion handler. If the ADISC never actually comes
4496  * back, we still have the timer running on the ADISC event struct
4497  * which will fire and cause the CRQ to get reset.
4498  *
4499  **/
4500 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
4501 {
4502     struct ibmvfc_host *vhost = evt->vhost;
4503     struct ibmvfc_target *tgt = evt->tgt;
4504
4505     tgt_dbg(tgt, "ADISC cancel complete\n");
4506     vhost->abort_threads--;
4507     ibmvfc_free_event(evt);
4508     kref_put(&tgt->kref, ibmvfc_release_tgt);
4509     wake_up(&vhost->work_wait_q);
4510 }
4511
4512 /**
4513  * ibmvfc_adisc_timeout - Handle an ADISC timeout
4514  * @t:      ibmvfc target struct
4515  *
4516  * If an ADISC times out, send a cancel. If the cancel times
4517  * out, reset the CRQ. When the ADISC comes back as cancelled,
4518  * log back into the target.
4519  **/
4520 static void ibmvfc_adisc_timeout(struct timer_list *t)
4521 {
4522     struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
4523     struct ibmvfc_host *vhost = tgt->vhost;
4524     struct ibmvfc_event *evt;
4525     struct ibmvfc_tmf *tmf;
4526     unsigned long flags;
4527     int rc;
4528
4529     tgt_dbg(tgt, "ADISC timeout\n");
4530     spin_lock_irqsave(vhost->host->host_lock, flags);
4531     if (vhost->abort_threads >= disc_threads ||
4532         tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
4533         vhost->state != IBMVFC_INITIALIZING ||
4534         vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
4535         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4536         return;
4537     }
4538
4539     vhost->abort_threads++;
4540     kref_get(&tgt->kref);
4541     evt = ibmvfc_get_event(&vhost->crq);
4542     ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
4543
4544     evt->tgt = tgt;
4545     tmf = &evt->iu.tmf;
4546     memset(tmf, 0, sizeof(*tmf));
4547     if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4548         tmf->common.version = cpu_to_be32(2);
4549         tmf->target_wwpn = cpu_to_be64(tgt->wwpn);
4550     } else {
4551         tmf->common.version = cpu_to_be32(1);
4552     }
4553     tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
4554     tmf->common.length = cpu_to_be16(sizeof(*tmf));
4555     tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
4556     tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
4557
4558     rc = ibmvfc_send_event(evt, vhost, default_timeout);
4559
4560     if (rc) {
4561         tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
4562         vhost->abort_threads--;
4563         kref_put(&tgt->kref, ibmvfc_release_tgt);
4564         __ibmvfc_reset_host(vhost);
4565     } else
4566         tgt_dbg(tgt, "Attempting to cancel ADISC\n");
4567     spin_unlock_irqrestore(vhost->host->host_lock, flags);
4568 }
4569
4570 /**
4571  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
4572  * @tgt:        ibmvfc target struct
4573  *
4574  * When sending an ADISC we end up with two timers running. The
4575  * first timer is the timer in the ibmvfc target struct. If this
4576  * fires, we send a cancel to the target. The second timer is the
4577  * timer on the ibmvfc event for the ADISC, which is longer. If that
4578  * fires, it means the ADISC timed out and our attempt to cancel it
4579  * also failed, so we need to reset the CRQ.
4580  **/
4581 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
4582 {
4583     struct ibmvfc_passthru_mad *mad;
4584     struct ibmvfc_host *vhost = tgt->vhost;
4585     struct ibmvfc_event *evt;
4586
4587     if (vhost->discovery_threads >= disc_threads)
4588         return;
4589
4590     kref_get(&tgt->kref);
4591     evt = ibmvfc_get_event(&vhost->crq);
4592     vhost->discovery_threads++;
4593     ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
4594     evt->tgt = tgt;
4595
4596     ibmvfc_init_passthru(evt);
4597     mad = &evt->iu.passthru;
4598     mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
4599     mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
4600     mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
4601
4602     mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
4603     memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
4604            sizeof(vhost->login_buf->resp.port_name));
4605     memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
4606            sizeof(vhost->login_buf->resp.node_name));
4607     mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
4608
4609     if (timer_pending(&tgt->timer))
4610         mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
4611     else {
4612         tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
4613         add_timer(&tgt->timer);
4614     }
4615
4616     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4617     if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
4618         vhost->discovery_threads--;
4619         del_timer(&tgt->timer);
4620         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4621         kref_put(&tgt->kref, ibmvfc_release_tgt);
4622     } else
4623         tgt_dbg(tgt, "Sent ADISC\n");
4624 }
4625
4626 /**
4627  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
4628  * @evt:    ibmvfc event struct
4629  *
4630  **/
4631 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
4632 {
4633     struct ibmvfc_target *tgt = evt->tgt;
4634     struct ibmvfc_host *vhost = evt->vhost;
4635     struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
4636     u32 status = be16_to_cpu(rsp->common.status);
4637     int level = IBMVFC_DEFAULT_LOG_LEVEL;
4638
4639     vhost->discovery_threads--;
4640     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4641     switch (status) {
4642     case IBMVFC_MAD_SUCCESS:
4643         tgt_dbg(tgt, "Query Target succeeded\n");
4644         if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
4645             ibmvfc_del_tgt(tgt);
4646         else
4647             ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
4648         break;
4649     case IBMVFC_MAD_DRIVER_FAILED:
4650         break;
4651     case IBMVFC_MAD_CRQ_ERROR:
4652         ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4653         break;
4654     case IBMVFC_MAD_FAILED:
4655     default:
4656         if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
4657             be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
4658             be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
4659             ibmvfc_del_tgt(tgt);
4660         else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4661             level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4662         else
4663             ibmvfc_del_tgt(tgt);
4664
4665         tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4666             ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4667             be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4668             ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4669             ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
4670             status);
4671         break;
4672     }
4673
4674     kref_put(&tgt->kref, ibmvfc_release_tgt);
4675     ibmvfc_free_event(evt);
4676     wake_up(&vhost->work_wait_q);
4677 }
4678
4679 /**
4680  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
4681  * @tgt:    ibmvfc target struct
4682  *
4683  **/
4684 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
4685 {
4686     struct ibmvfc_query_tgt *query_tgt;
4687     struct ibmvfc_host *vhost = tgt->vhost;
4688     struct ibmvfc_event *evt;
4689
4690     if (vhost->discovery_threads >= disc_threads)
4691         return;
4692
4693     kref_get(&tgt->kref);
4694     evt = ibmvfc_get_event(&vhost->crq);
4695     vhost->discovery_threads++;
4696     evt->tgt = tgt;
4697     ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
4698     query_tgt = &evt->iu.query_tgt;
4699     memset(query_tgt, 0, sizeof(*query_tgt));
4700     query_tgt->common.version = cpu_to_be32(1);
4701     query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
4702     query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
4703     query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
4704
4705     ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4706     if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4707         vhost->discovery_threads--;
4708         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4709         kref_put(&tgt->kref, ibmvfc_release_tgt);
4710     } else
4711         tgt_dbg(tgt, "Sent Query Target\n");
4712 }
4713
4714 /**
4715  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
4716  * @vhost:      ibmvfc host struct
4717  * @target:     Holds SCSI ID to allocate target forand the WWPN
4718  *
4719  * Returns:
4720  *  0 on success / other on failure
4721  **/
4722 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost,
4723                    struct ibmvfc_discover_targets_entry *target)
4724 {
4725     struct ibmvfc_target *stgt = NULL;
4726     struct ibmvfc_target *wtgt = NULL;
4727     struct ibmvfc_target *tgt;
4728     unsigned long flags;
4729     u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK;
4730     u64 wwpn = be64_to_cpu(target->wwpn);
4731
4732     /* Look to see if we already have a target allocated for this SCSI ID or WWPN */
4733     spin_lock_irqsave(vhost->host->host_lock, flags);
4734     list_for_each_entry(tgt, &vhost->targets, queue) {
4735         if (tgt->wwpn == wwpn) {
4736             wtgt = tgt;
4737             break;
4738         }
4739     }
4740
4741     list_for_each_entry(tgt, &vhost->targets, queue) {
4742         if (tgt->scsi_id == scsi_id) {
4743             stgt = tgt;
4744             break;
4745         }
4746     }
4747
4748     if (wtgt && !stgt) {
4749         /*
4750          * A WWPN target has moved and we still are tracking the old
4751          * SCSI ID.  The only way we should be able to get here is if
4752          * we attempted to send an implicit logout for the old SCSI ID
4753          * and it failed for some reason, such as there being I/O
4754          * pending to the target. In this case, we will have already
4755          * deleted the rport from the FC transport so we do a move
4756          * login, which works even with I/O pending, however, if
4757          * there is still I/O pending, it will stay outstanding, so
4758          * we only do this if fast fail is disabled for the rport,
4759          * otherwise we let terminate_rport_io clean up the port
4760          * before we login at the new location.
4761          */
4762         if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
4763             if (wtgt->move_login) {
4764                 /*
4765                  * Do a move login here. The old target is no longer
4766                  * known to the transport layer We don't use the
4767                  * normal ibmvfc_set_tgt_action to set this, as we
4768                  * don't normally want to allow this state change.
4769                  */
4770                 wtgt->new_scsi_id = scsi_id;
4771                 wtgt->action = IBMVFC_TGT_ACTION_INIT;
4772                 wtgt->init_retries = 0;
4773                 ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login);
4774             }
4775             goto unlock_out;
4776         } else {
4777             tgt_err(wtgt, "Unexpected target state: %d, %p\n",
4778                 wtgt->action, wtgt->rport);
4779         }
4780     } else if (stgt) {
4781         if (tgt->need_login)
4782             ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4783         goto unlock_out;
4784     }
4785     spin_unlock_irqrestore(vhost->host->host_lock, flags);
4786
4787     tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
4788     memset(tgt, 0, sizeof(*tgt));
4789     tgt->scsi_id = scsi_id;
4790     tgt->wwpn = wwpn;
4791     tgt->vhost = vhost;
4792     tgt->need_login = 1;
4793     timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
4794     kref_init(&tgt->kref);
4795     ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4796     spin_lock_irqsave(vhost->host->host_lock, flags);
4797     tgt->cancel_key = vhost->task_set++;
4798     list_add_tail(&tgt->queue, &vhost->targets);
4799
4800 unlock_out:
4801     spin_unlock_irqrestore(vhost->host->host_lock, flags);
4802     return 0;
4803 }
4804
4805 /**
4806  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
4807  * @vhost:      ibmvfc host struct
4808  *
4809  * Returns:
4810  *  0 on success / other on failure
4811  **/
4812 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
4813 {
4814     int i, rc;
4815
4816     for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
4817         rc = ibmvfc_alloc_target(vhost, &vhost->disc_buf[i]);
4818
4819     return rc;
4820 }
4821
4822 /**
4823  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
4824  * @evt:    ibmvfc event struct
4825  *
4826  **/
4827 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
4828 {
4829     struct ibmvfc_host *vhost = evt->vhost;
4830     struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
4831     u32 mad_status = be16_to_cpu(rsp->common.status);
4832     int level = IBMVFC_DEFAULT_LOG_LEVEL;
4833
4834     switch (mad_status) {
4835     case IBMVFC_MAD_SUCCESS:
4836         ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
4837         vhost->num_targets = be32_to_cpu(rsp->num_written);
4838         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
4839         break;
4840     case IBMVFC_MAD_FAILED:
4841         level += ibmvfc_retry_host_init(vhost);
4842         ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4843                ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4844                be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4845         break;
4846     case IBMVFC_MAD_DRIVER_FAILED:
4847         break;
4848     default:
4849         dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4850         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4851         break;
4852     }
4853
4854     ibmvfc_free_event(evt);
4855     wake_up(&vhost->work_wait_q);
4856 }
4857
4858 /**
4859  * ibmvfc_discover_targets - Send Discover Targets MAD
4860  * @vhost:  ibmvfc host struct
4861  *
4862  **/
4863 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4864 {
4865     struct ibmvfc_discover_targets *mad;
4866     struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq);
4867
4868     ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
4869     mad = &evt->iu.discover_targets;
4870     memset(mad, 0, sizeof(*mad));
4871     mad->common.version = cpu_to_be32(1);
4872     mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
4873     mad->common.length = cpu_to_be16(sizeof(*mad));
4874     mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
4875     mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
4876     mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
4877     mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST);
4878     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4879
4880     if (!ibmvfc_send_event(evt, vhost, default_timeout))
4881         ibmvfc_dbg(vhost, "Sent discover targets\n");
4882     else
4883         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4884 }
4885
4886 static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
4887 {
4888     struct ibmvfc_host *vhost = evt->vhost;
4889     struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf;
4890     struct ibmvfc_scsi_channels *scrqs = &vhost->scsi_scrqs;
4891     u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
4892     int level = IBMVFC_DEFAULT_LOG_LEVEL;
4893     int flags, active_queues, i;
4894
4895     ibmvfc_free_event(evt);
4896
4897     switch (mad_status) {
4898     case IBMVFC_MAD_SUCCESS:
4899         ibmvfc_dbg(vhost, "Channel Setup succeeded\n");
4900         flags = be32_to_cpu(setup->flags);
4901         vhost->do_enquiry = 0;
4902         active_queues = be32_to_cpu(setup->num_scsi_subq_channels);
4903         scrqs->active_queues = active_queues;
4904
4905         if (flags & IBMVFC_CHANNELS_CANCELED) {
4906             ibmvfc_dbg(vhost, "Channels Canceled\n");
4907             vhost->using_channels = 0;
4908         } else {
4909             if (active_queues)
4910                 vhost->using_channels = 1;
4911             for (i = 0; i < active_queues; i++)
4912                 scrqs->scrqs[i].vios_cookie =
4913                     be64_to_cpu(setup->channel_handles[i]);
4914
4915             ibmvfc_dbg(vhost, "Using %u channels\n",
4916                    vhost->scsi_scrqs.active_queues);
4917         }
4918         break;
4919     case IBMVFC_MAD_FAILED:
4920         level += ibmvfc_retry_host_init(vhost);
4921         ibmvfc_log(vhost, level, "Channel Setup failed\n");
4922         fallthrough;
4923     case IBMVFC_MAD_DRIVER_FAILED:
4924         return;
4925     default:
4926         dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n",
4927             mad_status);
4928         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4929         return;
4930     }
4931
4932     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4933     wake_up(&vhost->work_wait_q);
4934 }
4935
4936 static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
4937 {
4938     struct ibmvfc_channel_setup_mad *mad;
4939     struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
4940     struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq);
4941     struct ibmvfc_scsi_channels *scrqs = &vhost->scsi_scrqs;
4942     unsigned int num_channels =
4943         min(vhost->client_scsi_channels, vhost->max_vios_scsi_channels);
4944     int i;
4945
4946     memset(setup_buf, 0, sizeof(*setup_buf));
4947     if (num_channels == 0)
4948         setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
4949     else {
4950         setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels);
4951         for (i = 0; i < num_channels; i++)
4952             setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie);
4953     }
4954
4955     ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT);
4956     mad = &evt->iu.channel_setup;
4957     memset(mad, 0, sizeof(*mad));
4958     mad->common.version = cpu_to_be32(1);
4959     mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP);
4960     mad->common.length = cpu_to_be16(sizeof(*mad));
4961     mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma);
4962     mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf));
4963
4964     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4965
4966     if (!ibmvfc_send_event(evt, vhost, default_timeout))
4967         ibmvfc_dbg(vhost, "Sent channel setup\n");
4968     else
4969         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
4970 }
4971
4972 static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt)
4973 {
4974     struct ibmvfc_host *vhost = evt->vhost;
4975     struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry;
4976     u32 mad_status = be16_to_cpu(rsp->common.status);
4977     int level = IBMVFC_DEFAULT_LOG_LEVEL;
4978
4979     switch (mad_status) {
4980     case IBMVFC_MAD_SUCCESS:
4981         ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n");
4982         vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels);
4983         ibmvfc_free_event(evt);
4984         break;
4985     case IBMVFC_MAD_FAILED:
4986         level += ibmvfc_retry_host_init(vhost);
4987         ibmvfc_log(vhost, level, "Channel Enquiry failed\n");
4988         fallthrough;
4989     case IBMVFC_MAD_DRIVER_FAILED:
4990         ibmvfc_free_event(evt);
4991         return;
4992     default:
4993         dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n",
4994             mad_status);
4995         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4996         ibmvfc_free_event(evt);
4997         return;
4998     }
4999
5000     ibmvfc_channel_setup(vhost);
5001 }
5002
5003 static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost)
5004 {
5005     struct ibmvfc_channel_enquiry *mad;
5006     struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq);
5007
5008     ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT);
5009     mad = &evt->iu.channel_enquiry;
5010     memset(mad, 0, sizeof(*mad));
5011     mad->common.version = cpu_to_be32(1);
5012     mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY);
5013     mad->common.length = cpu_to_be16(sizeof(*mad));
5014
5015     if (mig_channels_only)
5016         mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT);
5017     if (mig_no_less_channels)
5018         mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT);
5019
5020     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5021
5022     if (!ibmvfc_send_event(evt, vhost, default_timeout))
5023         ibmvfc_dbg(vhost, "Send channel enquiry\n");
5024     else
5025         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5026 }
5027
5028 /**
5029  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
5030  * @evt:    ibmvfc event struct
5031  *
5032  **/
5033 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
5034 {
5035     struct ibmvfc_host *vhost = evt->vhost;
5036     u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
5037     struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
5038     unsigned int npiv_max_sectors;
5039     int level = IBMVFC_DEFAULT_LOG_LEVEL;
5040
5041     switch (mad_status) {
5042     case IBMVFC_MAD_SUCCESS:
5043         ibmvfc_free_event(evt);
5044         break;
5045     case IBMVFC_MAD_FAILED:
5046         if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
5047             level += ibmvfc_retry_host_init(vhost);
5048         else
5049             ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5050         ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
5051                ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
5052                         be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
5053         ibmvfc_free_event(evt);
5054         return;
5055     case IBMVFC_MAD_CRQ_ERROR:
5056         ibmvfc_retry_host_init(vhost);
5057         fallthrough;
5058     case IBMVFC_MAD_DRIVER_FAILED:
5059         ibmvfc_free_event(evt);
5060         return;
5061     default:
5062         dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
5063         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5064         ibmvfc_free_event(evt);
5065         return;
5066     }
5067
5068     vhost->client_migrated = 0;
5069
5070     if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
5071         dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
5072             rsp->flags);
5073         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5074         wake_up(&vhost->work_wait_q);
5075         return;
5076     }
5077
5078     if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
5079         dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
5080             rsp->max_cmds);
5081         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5082         wake_up(&vhost->work_wait_q);
5083         return;
5084     }
5085
5086     vhost->logged_in = 1;
5087     npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
5088     dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
5089          rsp->partition_name, rsp->device_name, rsp->port_loc_code,
5090          rsp->drc_name, npiv_max_sectors);
5091
5092     fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
5093     fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
5094     fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
5095     fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
5096     fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
5097     fc_host_supported_classes(vhost->host) = 0;
5098     if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
5099         fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
5100     if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
5101         fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
5102     if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
5103         fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
5104     fc_host_maxframe_size(vhost->host) =
5105         be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
5106
5107     vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
5108     vhost->host->max_sectors = npiv_max_sectors;
5109
5110     if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) {
5111         ibmvfc_channel_enquiry(vhost);
5112     } else {
5113         vhost->do_enquiry = 0;
5114         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5115         wake_up(&vhost->work_wait_q);
5116     }
5117 }
5118
5119 /**
5120  * ibmvfc_npiv_login - Sends NPIV login
5121  * @vhost:  ibmvfc host struct
5122  *
5123  **/
5124 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
5125 {
5126     struct ibmvfc_npiv_login_mad *mad;
5127     struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq);
5128
5129     ibmvfc_gather_partition_info(vhost);
5130     ibmvfc_set_login_info(vhost);
5131     ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
5132
5133     memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
5134     mad = &evt->iu.npiv_login;
5135     memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
5136     mad->common.version = cpu_to_be32(1);
5137     mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
5138     mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
5139     mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
5140     mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
5141
5142     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5143
5144     if (!ibmvfc_send_event(evt, vhost, default_timeout))
5145         ibmvfc_dbg(vhost, "Sent NPIV login\n");
5146     else
5147         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5148 }
5149
5150 /**
5151  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
5152  * @evt:        ibmvfc event struct
5153  *
5154  **/
5155 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
5156 {
5157     struct ibmvfc_host *vhost = evt->vhost;
5158     u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
5159
5160     ibmvfc_free_event(evt);
5161
5162     switch (mad_status) {
5163     case IBMVFC_MAD_SUCCESS:
5164         if (list_empty(&vhost->crq.sent) &&
5165             vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
5166             ibmvfc_init_host(vhost);
5167             return;
5168         }
5169         break;
5170     case IBMVFC_MAD_FAILED:
5171     case IBMVFC_MAD_NOT_SUPPORTED:
5172     case IBMVFC_MAD_CRQ_ERROR:
5173     case IBMVFC_MAD_DRIVER_FAILED:
5174     default:
5175         ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
5176         break;
5177     }
5178
5179     ibmvfc_hard_reset_host(vhost);
5180 }
5181
5182 /**
5183  * ibmvfc_npiv_logout - Issue an NPIV Logout
5184  * @vhost:      ibmvfc host struct
5185  *
5186  **/
5187 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
5188 {
5189     struct ibmvfc_npiv_logout_mad *mad;
5190     struct ibmvfc_event *evt;
5191
5192     evt = ibmvfc_get_event(&vhost->crq);
5193     ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
5194
5195     mad = &evt->iu.npiv_logout;
5196     memset(mad, 0, sizeof(*mad));
5197     mad->common.version = cpu_to_be32(1);
5198     mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
5199     mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
5200
5201     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
5202
5203     if (!ibmvfc_send_event(evt, vhost, default_timeout))
5204         ibmvfc_dbg(vhost, "Sent NPIV logout\n");
5205     else
5206         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5207 }
5208
5209 /**
5210  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
5211  * @vhost:      ibmvfc host struct
5212  *
5213  * Returns:
5214  *  1 if work to do / 0 if not
5215  **/
5216 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
5217 {
5218     struct ibmvfc_target *tgt;
5219
5220     list_for_each_entry(tgt, &vhost->targets, queue) {
5221         if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
5222             tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5223             return 1;
5224     }
5225
5226     return 0;
5227 }
5228
5229 /**
5230  * ibmvfc_dev_logo_to_do - Is there target logout work to do?
5231  * @vhost:      ibmvfc host struct
5232  *
5233  * Returns:
5234  *  1 if work to do / 0 if not
5235  **/
5236 static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost)
5237 {
5238     struct ibmvfc_target *tgt;
5239
5240     list_for_each_entry(tgt, &vhost->targets, queue) {
5241         if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT ||
5242             tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5243             return 1;
5244     }
5245     return 0;
5246 }
5247
5248 /**
5249  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
5250  * @vhost:      ibmvfc host struct
5251  *
5252  * Returns:
5253  *  1 if work to do / 0 if not
5254  **/
5255 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5256 {
5257     struct ibmvfc_target *tgt;
5258
5259     if (kthread_should_stop())
5260         return 1;
5261     switch (vhost->action) {
5262     case IBMVFC_HOST_ACTION_NONE:
5263     case IBMVFC_HOST_ACTION_INIT_WAIT:
5264     case IBMVFC_HOST_ACTION_LOGO_WAIT:
5265         return 0;
5266     case IBMVFC_HOST_ACTION_TGT_INIT:
5267     case IBMVFC_HOST_ACTION_QUERY_TGTS:
5268         if (vhost->discovery_threads == disc_threads)
5269             return 0;
5270         list_for_each_entry(tgt, &vhost->targets, queue)
5271             if (tgt->action == IBMVFC_TGT_ACTION_INIT)
5272                 return 1;
5273         list_for_each_entry(tgt, &vhost->targets, queue)
5274             if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5275                 return 0;
5276         return 1;
5277     case IBMVFC_HOST_ACTION_TGT_DEL:
5278     case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5279         if (vhost->discovery_threads == disc_threads)
5280             return 0;
5281         list_for_each_entry(tgt, &vhost->targets, queue)
5282             if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT)
5283                 return 1;
5284         list_for_each_entry(tgt, &vhost->targets, queue)
5285             if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5286                 return 0;
5287         return 1;
5288     case IBMVFC_HOST_ACTION_LOGO:
5289     case IBMVFC_HOST_ACTION_INIT:
5290     case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5291     case IBMVFC_HOST_ACTION_QUERY:
5292     case IBMVFC_HOST_ACTION_RESET:
5293     case IBMVFC_HOST_ACTION_REENABLE:
5294     default:
5295         break;
5296     }
5297
5298     return 1;
5299 }
5300
5301 /**
5302  * ibmvfc_work_to_do - Is there task level work to do?
5303  * @vhost:      ibmvfc host struct
5304  *
5305  * Returns:
5306  *  1 if work to do / 0 if not
5307  **/
5308 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5309 {
5310     unsigned long flags;
5311     int rc;
5312
5313     spin_lock_irqsave(vhost->host->host_lock, flags);
5314     rc = __ibmvfc_work_to_do(vhost);
5315     spin_unlock_irqrestore(vhost->host->host_lock, flags);
5316     return rc;
5317 }
5318
5319 /**
5320  * ibmvfc_log_ae - Log async events if necessary
5321  * @vhost:      ibmvfc host struct
5322  * @events:     events to log
5323  *
5324  **/
5325 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
5326 {
5327     if (events & IBMVFC_AE_RSCN)
5328         fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
5329     if ((events & IBMVFC_AE_LINKDOWN) &&
5330         vhost->state >= IBMVFC_HALTED)
5331         fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
5332     if ((events & IBMVFC_AE_LINKUP) &&
5333         vhost->state == IBMVFC_INITIALIZING)
5334         fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
5335 }
5336
5337 /**
5338  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
5339  * @tgt:        ibmvfc target struct
5340  *
5341  **/
5342 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
5343 {
5344     struct ibmvfc_host *vhost = tgt->vhost;
5345     struct fc_rport *rport;
5346     unsigned long flags;
5347
5348     tgt_dbg(tgt, "Adding rport\n");
5349     rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
5350     spin_lock_irqsave(vhost->host->host_lock, flags);
5351
5352     if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5353         tgt_dbg(tgt, "Deleting rport\n");
5354         list_del(&tgt->queue);
5355         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5356         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5357         fc_remote_port_delete(rport);
5358         del_timer_sync(&tgt->timer);
5359         kref_put(&tgt->kref, ibmvfc_release_tgt);
5360         return;
5361     } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5362         tgt_dbg(tgt, "Deleting rport with outstanding I/O\n");
5363         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5364         tgt->rport = NULL;
5365         tgt->init_retries = 0;
5366         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5367         fc_remote_port_delete(rport);
5368         return;
5369     } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
5370         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5371         return;
5372     }
5373
5374     if (rport) {
5375         tgt_dbg(tgt, "rport add succeeded\n");
5376         tgt->rport = rport;
5377         rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
5378         rport->supported_classes = 0;
5379         tgt->target_id = rport->scsi_target_id;
5380         if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
5381             rport->supported_classes |= FC_COS_CLASS1;
5382         if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
5383             rport->supported_classes |= FC_COS_CLASS2;
5384         if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
5385             rport->supported_classes |= FC_COS_CLASS3;
5386         if (rport->rqst_q)
5387             blk_queue_max_segments(rport->rqst_q, 1);
5388     } else
5389         tgt_dbg(tgt, "rport add failed\n");
5390     spin_unlock_irqrestore(vhost->host->host_lock, flags);
5391 }
5392
5393 /**
5394  * ibmvfc_do_work - Do task level work
5395  * @vhost:      ibmvfc host struct
5396  *
5397  **/
5398 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
5399 {
5400     struct ibmvfc_target *tgt;
5401     unsigned long flags;
5402     struct fc_rport *rport;
5403     LIST_HEAD(purge);
5404     int rc;
5405
5406     ibmvfc_log_ae(vhost, vhost->events_to_log);
5407     spin_lock_irqsave(vhost->host->host_lock, flags);
5408     vhost->events_to_log = 0;
5409     switch (vhost->action) {
5410     case IBMVFC_HOST_ACTION_NONE:
5411     case IBMVFC_HOST_ACTION_LOGO_WAIT:
5412     case IBMVFC_HOST_ACTION_INIT_WAIT:
5413         break;
5414     case IBMVFC_HOST_ACTION_RESET:
5415         list_splice_init(&vhost->purge, &purge);
5416         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5417         ibmvfc_complete_purge(&purge);
5418         rc = ibmvfc_reset_crq(vhost);
5419
5420         spin_lock_irqsave(vhost->host->host_lock, flags);
5421         if (!rc || rc == H_CLOSED)
5422             vio_enable_interrupts(to_vio_dev(vhost->dev));
5423         if (vhost->action == IBMVFC_HOST_ACTION_RESET) {
5424             /*
5425              * The only action we could have changed to would have
5426              * been reenable, in which case, we skip the rest of
5427              * this path and wait until we've done the re-enable
5428              * before sending the crq init.
5429              */
5430             vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5431
5432             if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
5433                 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
5434                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5435                 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
5436             }
5437         }
5438         break;
5439     case IBMVFC_HOST_ACTION_REENABLE:
5440         list_splice_init(&vhost->purge, &purge);
5441         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5442         ibmvfc_complete_purge(&purge);
5443         rc = ibmvfc_reenable_crq_queue(vhost);
5444
5445         spin_lock_irqsave(vhost->host->host_lock, flags);
5446         if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) {
5447             /*
5448              * The only action we could have changed to would have
5449              * been reset, in which case, we skip the rest of this
5450              * path and wait until we've done the reset before
5451              * sending the crq init.
5452              */
5453             vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5454             if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
5455                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5456                 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
5457             }
5458         }
5459         break;
5460     case IBMVFC_HOST_ACTION_LOGO:
5461         vhost->job_step(vhost);
5462         break;
5463     case IBMVFC_HOST_ACTION_INIT:
5464         BUG_ON(vhost->state != IBMVFC_INITIALIZING);
5465         if (vhost->delay_init) {
5466             vhost->delay_init = 0;
5467             spin_unlock_irqrestore(vhost->host->host_lock, flags);
5468             ssleep(15);
5469             return;
5470         } else
5471             vhost->job_step(vhost);
5472         break;
5473     case IBMVFC_HOST_ACTION_QUERY:
5474         list_for_each_entry(tgt, &vhost->targets, queue)
5475             ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
5476         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
5477         break;
5478     case IBMVFC_HOST_ACTION_QUERY_TGTS:
5479         list_for_each_entry(tgt, &vhost->targets, queue) {
5480             if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5481                 tgt->job_step(tgt);
5482                 break;
5483             }
5484         }
5485
5486         if (!ibmvfc_dev_init_to_do(vhost))
5487             ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
5488         break;
5489     case IBMVFC_HOST_ACTION_TGT_DEL:
5490     case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5491         list_for_each_entry(tgt, &vhost->targets, queue) {
5492             if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
5493                 tgt->job_step(tgt);
5494                 break;
5495             }
5496         }
5497
5498         if (ibmvfc_dev_logo_to_do(vhost)) {
5499             spin_unlock_irqrestore(vhost->host->host_lock, flags);
5500             return;
5501         }
5502
5503         list_for_each_entry(tgt, &vhost->targets, queue) {
5504             if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5505                 tgt_dbg(tgt, "Deleting rport\n");
5506                 rport = tgt->rport;
5507                 tgt->rport = NULL;
5508                 list_del(&tgt->queue);
5509                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5510                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5511                 if (rport)
5512                     fc_remote_port_delete(rport);
5513                 del_timer_sync(&tgt->timer);
5514                 kref_put(&tgt->kref, ibmvfc_release_tgt);
5515                 return;
5516             } else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5517                 tgt_dbg(tgt, "Deleting rport with I/O outstanding\n");
5518                 rport = tgt->rport;
5519                 tgt->rport = NULL;
5520                 tgt->init_retries = 0;
5521                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5522
5523                 /*
5524                  * If fast fail is enabled, we wait for it to fire and then clean up
5525                  * the old port, since we expect the fast fail timer to clean up the
5526                  * outstanding I/O faster than waiting for normal command timeouts.
5527                  * However, if fast fail is disabled, any I/O outstanding to the
5528                  * rport LUNs will stay outstanding indefinitely, since the EH handlers
5529                  * won't get invoked for I/O's timing out. If this is a NPIV failover
5530                  * scenario, the better alternative is to use the move login.
5531                  */
5532                 if (rport && rport->fast_io_fail_tmo == -1)
5533                     tgt->move_login = 1;
5534                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
5535                 if (rport)
5536                     fc_remote_port_delete(rport);
5537                 return;
5538             }
5539         }
5540
5541         if (vhost->state == IBMVFC_INITIALIZING) {
5542             if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
5543                 if (vhost->reinit) {
5544                     vhost->reinit = 0;
5545                     scsi_block_requests(vhost->host);
5546                     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5547                     spin_unlock_irqrestore(vhost->host->host_lock, flags);
5548                 } else {
5549                     ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
5550                     ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5551                     wake_up(&vhost->init_wait_q);
5552                     schedule_work(&vhost->rport_add_work_q);
5553                     vhost->init_retries = 0;
5554                     spin_unlock_irqrestore(vhost->host->host_lock, flags);
5555                     scsi_unblock_requests(vhost->host);
5556                 }
5557
5558                 return;
5559             } else {
5560                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
5561                 vhost->job_step = ibmvfc_discover_targets;
5562             }
5563         } else {
5564             ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5565             spin_unlock_irqrestore(vhost->host->host_lock, flags);
5566             scsi_unblock_requests(vhost->host);
5567             wake_up(&vhost->init_wait_q);
5568             return;
5569         }
5570         break;
5571     case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5572         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
5573         spin_unlock_irqrestore(vhost->host->host_lock, flags);
5574         ibmvfc_alloc_targets(vhost);
5575         spin_lock_irqsave(vhost->host->host_lock, flags);
5576         break;
5577     case IBMVFC_HOST_ACTION_TGT_INIT:
5578         list_for_each_entry(tgt, &vhost->targets, queue) {
5579             if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5580                 tgt->job_step(tgt);
5581                 break;
5582             }
5583         }
5584
5585         if (!ibmvfc_dev_init_to_do(vhost))
5586             ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
5587         break;
5588     default:
5589         break;
5590     }
5591
5592     spin_unlock_irqrestore(vhost->host->host_lock, flags);
5593 }
5594
5595 /**
5596  * ibmvfc_work - Do task level work
5597  * @data:       ibmvfc host struct
5598  *
5599  * Returns:
5600  *  zero
5601  **/
5602 static int ibmvfc_work(void *data)
5603 {
5604     struct ibmvfc_host *vhost = data;
5605     int rc;
5606
5607     set_user_nice(current, MIN_NICE);
5608
5609     while (1) {
5610         rc = wait_event_interruptible(vhost->work_wait_q,
5611                           ibmvfc_work_to_do(vhost));
5612
5613         BUG_ON(rc);
5614
5615         if (kthread_should_stop())
5616             break;
5617
5618         ibmvfc_do_work(vhost);
5619     }
5620
5621     ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
5622     return 0;
5623 }
5624
5625 /**
5626  * ibmvfc_alloc_queue - Allocate queue
5627  * @vhost:  ibmvfc host struct
5628  * @queue:  ibmvfc queue to allocate
5629  * @fmt:    queue format to allocate
5630  *
5631  * Returns:
5632  *  0 on success / non-zero on failure
5633  **/
5634 static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost,
5635                   struct ibmvfc_queue *queue,
5636                   enum ibmvfc_msg_fmt fmt)
5637 {
5638     struct device *dev = vhost->dev;
5639     size_t fmt_size;
5640     unsigned int pool_size = 0;
5641
5642     ENTER;
5643     spin_lock_init(&queue->_lock);
5644     queue->q_lock = &queue->_lock;
5645
5646     switch (fmt) {
5647     case IBMVFC_CRQ_FMT:
5648         fmt_size = sizeof(*queue->msgs.crq);
5649         pool_size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
5650         break;
5651     case IBMVFC_ASYNC_FMT:
5652         fmt_size = sizeof(*queue->msgs.async);
5653         break;
5654     case IBMVFC_SUB_CRQ_FMT:
5655         fmt_size = sizeof(*queue->msgs.scrq);
5656         /* We need one extra event for Cancel Commands */
5657         pool_size = max_requests + 1;
5658         break;
5659     default:
5660         dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt);
5661         return -EINVAL;
5662     }
5663
5664     if (ibmvfc_init_event_pool(vhost, queue, pool_size)) {
5665         dev_err(dev, "Couldn't initialize event pool.\n");
5666         return -ENOMEM;
5667     }
5668
5669     queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL);
5670     if (!queue->msgs.handle)
5671         return -ENOMEM;
5672
5673     queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE,
5674                       DMA_BIDIRECTIONAL);
5675
5676     if (dma_mapping_error(dev, queue->msg_token)) {
5677         free_page((unsigned long)queue->msgs.handle);
5678         queue->msgs.handle = NULL;
5679         return -ENOMEM;
5680     }
5681
5682     queue->cur = 0;
5683     queue->fmt = fmt;
5684     queue->size = PAGE_SIZE / fmt_size;
5685
5686     queue->vhost = vhost;
5687     return 0;
5688 }
5689
5690 /**
5691  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
5692  * @vhost:  ibmvfc host struct
5693  *
5694  * Allocates a page for messages, maps it for dma, and registers
5695  * the crq with the hypervisor.
5696  *
5697  * Return value:
5698  *  zero on success / other on failure
5699  **/
5700 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
5701 {
5702     int rc, retrc = -ENOMEM;
5703     struct device *dev = vhost->dev;
5704     struct vio_dev *vdev = to_vio_dev(dev);
5705     struct ibmvfc_queue *crq = &vhost->crq;
5706
5707     ENTER;
5708     if (ibmvfc_alloc_queue(vhost, crq, IBMVFC_CRQ_FMT))
5709         return -ENOMEM;
5710
5711     retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5712                     crq->msg_token, PAGE_SIZE);
5713
5714     if (rc == H_RESOURCE)
5715         /* maybe kexecing and resource is busy. try a reset */
5716         retrc = rc = ibmvfc_reset_crq(vhost);
5717
5718     if (rc == H_CLOSED)
5719         dev_warn(dev, "Partner adapter not ready\n");
5720     else if (rc) {
5721         dev_warn(dev, "Error %d opening adapter\n", rc);
5722         goto reg_crq_failed;
5723     }
5724
5725     retrc = 0;
5726
5727     tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
5728
5729     if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
5730         dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
5731         goto req_irq_failed;
5732     }
5733
5734     if ((rc = vio_enable_interrupts(vdev))) {
5735         dev_err(dev, "Error %d enabling interrupts\n", rc);
5736         goto req_irq_failed;
5737     }
5738
5739     LEAVE;
5740     return retrc;
5741
5742 req_irq_failed:
5743     tasklet_kill(&vhost->tasklet);
5744     do {
5745         rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5746     } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5747 reg_crq_failed:
5748     ibmvfc_free_queue(vhost, crq);
5749     return retrc;
5750 }
5751
5752 static int ibmvfc_register_scsi_channel(struct ibmvfc_host *vhost,
5753                   int index)
5754 {
5755     struct device *dev = vhost->dev;
5756     struct vio_dev *vdev = to_vio_dev(dev);
5757     struct ibmvfc_queue *scrq = &vhost->scsi_scrqs.scrqs[index];
5758     int rc = -ENOMEM;
5759
5760     ENTER;
5761
5762     rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE,
5763                &scrq->cookie, &scrq->hw_irq);
5764
5765     /* H_CLOSED indicates successful register, but no CRQ partner */
5766     if (rc && rc != H_CLOSED) {
5767         dev_warn(dev, "Error registering sub-crq: %d\n", rc);
5768         if (rc == H_PARAMETER)
5769             dev_warn_once(dev, "Firmware may not support MQ\n");
5770         goto reg_failed;
5771     }
5772
5773     scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
5774
5775     if (!scrq->irq) {
5776         rc = -EINVAL;
5777         dev_err(dev, "Error mapping sub-crq[%d] irq\n", index);
5778         goto irq_failed;
5779     }
5780
5781     snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d",
5782          vdev->unit_address, index);
5783     rc = request_irq(scrq->irq, ibmvfc_interrupt_scsi, 0, scrq->name, scrq);
5784
5785     if (rc) {
5786         dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index);
5787         irq_dispose_mapping(scrq->irq);
5788         goto irq_failed;
5789     }
5790
5791     scrq->hwq_id = index;
5792
5793     LEAVE;
5794     return 0;
5795
5796 irq_failed:
5797     do {
5798         rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
5799     } while (rtas_busy_delay(rc));
5800 reg_failed:
5801     LEAVE;
5802     return rc;
5803 }
5804
5805 static void ibmvfc_deregister_scsi_channel(struct ibmvfc_host *vhost, int index)
5806 {
5807     struct device *dev = vhost->dev;
5808     struct vio_dev *vdev = to_vio_dev(dev);
5809     struct ibmvfc_queue *scrq = &vhost->scsi_scrqs.scrqs[index];
5810     long rc;
5811
5812     ENTER;
5813
5814     free_irq(scrq->irq, scrq);
5815     irq_dispose_mapping(scrq->irq);
5816     scrq->irq = 0;
5817
5818     do {
5819         rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address,
5820                     scrq->cookie);
5821     } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5822
5823     if (rc)
5824         dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc);
5825
5826     /* Clean out the queue */
5827     memset(scrq->msgs.crq, 0, PAGE_SIZE);
5828     scrq->cur = 0;
5829
5830     LEAVE;
5831 }
5832
5833 static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *vhost)
5834 {
5835     int i, j;
5836
5837     ENTER;
5838     if (!vhost->mq_enabled || !vhost->scsi_scrqs.scrqs)
5839         return;
5840
5841     for (i = 0; i < nr_scsi_hw_queues; i++) {
5842         if (ibmvfc_register_scsi_channel(vhost, i)) {
5843             for (j = i; j > 0; j--)
5844                 ibmvfc_deregister_scsi_channel(vhost, j - 1);
5845             vhost->do_enquiry = 0;
5846             return;
5847         }
5848     }
5849
5850     LEAVE;
5851 }
5852
5853 static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *vhost)
5854 {
5855     int i;
5856
5857     ENTER;
5858     if (!vhost->mq_enabled || !vhost->scsi_scrqs.scrqs)
5859         return;
5860
5861     for (i = 0; i < nr_scsi_hw_queues; i++)
5862         ibmvfc_deregister_scsi_channel(vhost, i);
5863
5864     LEAVE;
5865 }
5866
5867 static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost)
5868 {
5869     struct ibmvfc_queue *scrq;
5870     int i, j;
5871
5872     ENTER;
5873     if (!vhost->mq_enabled)
5874         return;
5875
5876     vhost->scsi_scrqs.scrqs = kcalloc(nr_scsi_hw_queues,
5877                       sizeof(*vhost->scsi_scrqs.scrqs),
5878                       GFP_KERNEL);
5879     if (!vhost->scsi_scrqs.scrqs) {
5880         vhost->do_enquiry = 0;
5881         return;
5882     }
5883
5884     for (i = 0; i < nr_scsi_hw_queues; i++) {
5885         scrq = &vhost->scsi_scrqs.scrqs[i];
5886         if (ibmvfc_alloc_queue(vhost, scrq, IBMVFC_SUB_CRQ_FMT)) {
5887             for (j = i; j > 0; j--) {
5888                 scrq = &vhost->scsi_scrqs.scrqs[j - 1];
5889                 ibmvfc_free_queue(vhost, scrq);
5890             }
5891             kfree(vhost->scsi_scrqs.scrqs);
5892             vhost->scsi_scrqs.scrqs = NULL;
5893             vhost->scsi_scrqs.active_queues = 0;
5894             vhost->do_enquiry = 0;
5895             vhost->mq_enabled = 0;
5896             return;
5897         }
5898     }
5899
5900     ibmvfc_reg_sub_crqs(vhost);
5901
5902     LEAVE;
5903 }
5904
5905 static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost)
5906 {
5907     struct ibmvfc_queue *scrq;
5908     int i;
5909
5910     ENTER;
5911     if (!vhost->scsi_scrqs.scrqs)
5912         return;
5913
5914     ibmvfc_dereg_sub_crqs(vhost);
5915
5916     for (i = 0; i < nr_scsi_hw_queues; i++) {
5917         scrq = &vhost->scsi_scrqs.scrqs[i];
5918         ibmvfc_free_queue(vhost, scrq);
5919     }
5920
5921     kfree(vhost->scsi_scrqs.scrqs);
5922     vhost->scsi_scrqs.scrqs = NULL;
5923     vhost->scsi_scrqs.active_queues = 0;
5924     LEAVE;
5925 }
5926
5927 /**
5928  * ibmvfc_free_mem - Free memory for vhost
5929  * @vhost:  ibmvfc host struct
5930  *
5931  * Return value:
5932  *  none
5933  **/
5934 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
5935 {
5936     struct ibmvfc_queue *async_q = &vhost->async_crq;
5937
5938     ENTER;
5939     mempool_destroy(vhost->tgt_pool);
5940     kfree(vhost->trace);
5941     dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
5942               vhost->disc_buf_dma);
5943     dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
5944               vhost->login_buf, vhost->login_buf_dma);
5945     dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf),
5946               vhost->channel_setup_buf, vhost->channel_setup_dma);
5947     dma_pool_destroy(vhost->sg_pool);
5948     ibmvfc_free_queue(vhost, async_q);
5949     LEAVE;
5950 }
5951
5952 /**
5953  * ibmvfc_alloc_mem - Allocate memory for vhost
5954  * @vhost:  ibmvfc host struct
5955  *
5956  * Return value:
5957  *  0 on success / non-zero on failure
5958  **/
5959 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
5960 {
5961     struct ibmvfc_queue *async_q = &vhost->async_crq;
5962     struct device *dev = vhost->dev;
5963
5964     ENTER;
5965     if (ibmvfc_alloc_queue(vhost, async_q, IBMVFC_ASYNC_FMT)) {
5966         dev_err(dev, "Couldn't allocate/map async queue.\n");
5967         goto nomem;
5968     }
5969
5970     vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
5971                      SG_ALL * sizeof(struct srp_direct_buf),
5972                      sizeof(struct srp_direct_buf), 0);
5973
5974     if (!vhost->sg_pool) {
5975         dev_err(dev, "Failed to allocate sg pool\n");
5976         goto unmap_async_crq;
5977     }
5978
5979     vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
5980                           &vhost->login_buf_dma, GFP_KERNEL);
5981
5982     if (!vhost->login_buf) {
5983         dev_err(dev, "Couldn't allocate NPIV login buffer\n");
5984         goto free_sg_pool;
5985     }
5986
5987     vhost->disc_buf_sz = sizeof(*vhost->disc_buf) * max_targets;
5988     vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
5989                          &vhost->disc_buf_dma, GFP_KERNEL);
5990
5991     if (!vhost->disc_buf) {
5992         dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
5993         goto free_login_buffer;
5994     }
5995
5996     vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
5997                    sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
5998     atomic_set(&vhost->trace_index, -1);
5999
6000     if (!vhost->trace)
6001         goto free_disc_buffer;
6002
6003     vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
6004                               sizeof(struct ibmvfc_target));
6005
6006     if (!vhost->tgt_pool) {
6007         dev_err(dev, "Couldn't allocate target memory pool\n");
6008         goto free_trace;
6009     }
6010
6011     vhost->channel_setup_buf = dma_alloc_coherent(dev, sizeof(*vhost->channel_setup_buf),
6012                               &vhost->channel_setup_dma,
6013                               GFP_KERNEL);
6014
6015     if (!vhost->channel_setup_buf) {
6016         dev_err(dev, "Couldn't allocate Channel Setup buffer\n");
6017         goto free_tgt_pool;
6018     }
6019
6020     LEAVE;
6021     return 0;
6022
6023 free_tgt_pool:
6024     mempool_destroy(vhost->tgt_pool);
6025 free_trace:
6026     kfree(vhost->trace);
6027 free_disc_buffer:
6028     dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
6029               vhost->disc_buf_dma);
6030 free_login_buffer:
6031     dma_free_coherent(dev, sizeof(*vhost->login_buf),
6032               vhost->login_buf, vhost->login_buf_dma);
6033 free_sg_pool:
6034     dma_pool_destroy(vhost->sg_pool);
6035 unmap_async_crq:
6036     ibmvfc_free_queue(vhost, async_q);
6037 nomem:
6038     LEAVE;
6039     return -ENOMEM;
6040 }
6041
6042 /**
6043  * ibmvfc_rport_add_thread - Worker thread for rport adds
6044  * @work:   work struct
6045  *
6046  **/
6047 static void ibmvfc_rport_add_thread(struct work_struct *work)
6048 {
6049     struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
6050                          rport_add_work_q);
6051     struct ibmvfc_target *tgt;
6052     struct fc_rport *rport;
6053     unsigned long flags;
6054     int did_work;
6055
6056     ENTER;
6057     spin_lock_irqsave(vhost->host->host_lock, flags);
6058     do {
6059         did_work = 0;
6060         if (vhost->state != IBMVFC_ACTIVE)
6061             break;
6062
6063         list_for_each_entry(tgt, &vhost->targets, queue) {
6064             if (tgt->add_rport) {
6065                 did_work = 1;
6066                 tgt->add_rport = 0;
6067                 kref_get(&tgt->kref);
6068                 rport = tgt->rport;
6069                 if (!rport) {
6070                     spin_unlock_irqrestore(vhost->host->host_lock, flags);
6071                     ibmvfc_tgt_add_rport(tgt);
6072                 } else if (get_device(&rport->dev)) {
6073                     spin_unlock_irqrestore(vhost->host->host_lock, flags);
6074                     tgt_dbg(tgt, "Setting rport roles\n");
6075                     fc_remote_port_rolechg(rport, tgt->ids.roles);
6076                     put_device(&rport->dev);
6077                 } else {
6078                     spin_unlock_irqrestore(vhost->host->host_lock, flags);
6079                 }
6080
6081                 kref_put(&tgt->kref, ibmvfc_release_tgt);
6082                 spin_lock_irqsave(vhost->host->host_lock, flags);
6083                 break;
6084             }
6085         }
6086     } while(did_work);
6087
6088     if (vhost->state == IBMVFC_ACTIVE)
6089         vhost->scan_complete = 1;
6090     spin_unlock_irqrestore(vhost->host->host_lock, flags);
6091     LEAVE;
6092 }
6093
6094 /**
6095  * ibmvfc_probe - Adapter hot plug add entry point
6096  * @vdev:   vio device struct
6097  * @id: vio device id struct
6098  *
6099  * Return value:
6100  *  0 on success / non-zero on failure
6101  **/
6102 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
6103 {
6104     struct ibmvfc_host *vhost;
6105     struct Scsi_Host *shost;
6106     struct device *dev = &vdev->dev;
6107     int rc = -ENOMEM;
6108     unsigned int max_scsi_queues = IBMVFC_MAX_SCSI_QUEUES;
6109
6110     ENTER;
6111     shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
6112     if (!shost) {
6113         dev_err(dev, "Couldn't allocate host data\n");
6114         goto out;
6115     }
6116
6117     shost->transportt = ibmvfc_transport_template;
6118     shost->can_queue = max_requests;
6119     shost->max_lun = max_lun;
6120     shost->max_id = max_targets;
6121     shost->max_sectors = IBMVFC_MAX_SECTORS;
6122     shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
6123     shost->unique_id = shost->host_no;
6124     shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1;
6125
6126     vhost = shost_priv(shost);
6127     INIT_LIST_HEAD(&vhost->targets);
6128     INIT_LIST_HEAD(&vhost->purge);
6129     sprintf(vhost->name, IBMVFC_NAME);
6130     vhost->host = shost;
6131     vhost->dev = dev;
6132     vhost->partition_number = -1;
6133     vhost->log_level = log_level;
6134     vhost->task_set = 1;
6135
6136     vhost->mq_enabled = mq_enabled;
6137     vhost->client_scsi_channels = min(shost->nr_hw_queues, nr_scsi_channels);
6138     vhost->using_channels = 0;
6139     vhost->do_enquiry = 1;
6140     vhost->scan_timeout = 0;
6141
6142     strcpy(vhost->partition_name, "UNKNOWN");
6143     init_waitqueue_head(&vhost->work_wait_q);
6144     init_waitqueue_head(&vhost->init_wait_q);
6145     INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
6146     mutex_init(&vhost->passthru_mutex);
6147
6148     if ((rc = ibmvfc_alloc_mem(vhost)))
6149         goto free_scsi_host;
6150
6151     vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
6152                      shost->host_no);
6153
6154     if (IS_ERR(vhost->work_thread)) {
6155         dev_err(dev, "Couldn't create kernel thread: %ld\n",
6156             PTR_ERR(vhost->work_thread));
6157         rc = PTR_ERR(vhost->work_thread);
6158         goto free_host_mem;
6159     }
6160
6161     if ((rc = ibmvfc_init_crq(vhost))) {
6162         dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
6163         goto kill_kthread;
6164     }
6165
6166     if ((rc = scsi_add_host(shost, dev)))
6167         goto release_crq;
6168
6169     fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
6170
6171     if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
6172                        &ibmvfc_trace_attr))) {
6173         dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
6174         goto remove_shost;
6175     }
6176
6177     ibmvfc_init_sub_crqs(vhost);
6178
6179     if (shost_to_fc_host(shost)->rqst_q)
6180         blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
6181     dev_set_drvdata(dev, vhost);
6182     spin_lock(&ibmvfc_driver_lock);
6183     list_add_tail(&vhost->queue, &ibmvfc_head);
6184     spin_unlock(&ibmvfc_driver_lock);
6185
6186     ibmvfc_send_crq_init(vhost);
6187     scsi_scan_host(shost);
6188     return 0;
6189
6190 remove_shost:
6191     scsi_remove_host(shost);
6192 release_crq:
6193     ibmvfc_release_crq_queue(vhost);
6194 kill_kthread:
6195     kthread_stop(vhost->work_thread);
6196 free_host_mem:
6197     ibmvfc_free_mem(vhost);
6198 free_scsi_host:
6199     scsi_host_put(shost);
6200 out:
6201     LEAVE;
6202     return rc;
6203 }
6204
6205 /**
6206  * ibmvfc_remove - Adapter hot plug remove entry point
6207  * @vdev:   vio device struct
6208  *
6209  * Return value:
6210  *  0
6211  **/
6212 static void ibmvfc_remove(struct vio_dev *vdev)
6213 {
6214     struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
6215     LIST_HEAD(purge);
6216     unsigned long flags;
6217
6218     ENTER;
6219     ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
6220
6221     spin_lock_irqsave(vhost->host->host_lock, flags);
6222     ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
6223     spin_unlock_irqrestore(vhost->host->host_lock, flags);
6224
6225     ibmvfc_wait_while_resetting(vhost);
6226     kthread_stop(vhost->work_thread);
6227     fc_remove_host(vhost->host);
6228     scsi_remove_host(vhost->host);
6229
6230     spin_lock_irqsave(vhost->host->host_lock, flags);
6231     ibmvfc_purge_requests(vhost, DID_ERROR);
6232     list_splice_init(&vhost->purge, &purge);
6233     spin_unlock_irqrestore(vhost->host->host_lock, flags);
6234     ibmvfc_complete_purge(&purge);
6235     ibmvfc_release_sub_crqs(vhost);
6236     ibmvfc_release_crq_queue(vhost);
6237
6238     ibmvfc_free_mem(vhost);
6239     spin_lock(&ibmvfc_driver_lock);
6240     list_del(&vhost->queue);
6241     spin_unlock(&ibmvfc_driver_lock);
6242     scsi_host_put(vhost->host);
6243     LEAVE;
6244 }
6245
6246 /**
6247  * ibmvfc_resume - Resume from suspend
6248  * @dev:    device struct
6249  *
6250  * We may have lost an interrupt across suspend/resume, so kick the
6251  * interrupt handler
6252  *
6253  */
6254 static int ibmvfc_resume(struct device *dev)
6255 {
6256     unsigned long flags;
6257     struct ibmvfc_host *vhost = dev_get_drvdata(dev);
6258     struct vio_dev *vdev = to_vio_dev(dev);
6259
6260     spin_lock_irqsave(vhost->host->host_lock, flags);
6261     vio_disable_interrupts(vdev);
6262     tasklet_schedule(&vhost->tasklet);
6263     spin_unlock_irqrestore(vhost->host->host_lock, flags);
6264     return 0;
6265 }
6266
6267 /**
6268  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
6269  * @vdev:   vio device struct
6270  *
6271  * Return value:
6272  *  Number of bytes the driver will need to DMA map at the same time in
6273  *  order to perform well.
6274  */
6275 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
6276 {
6277     unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
6278     return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
6279 }
6280
6281 static const struct vio_device_id ibmvfc_device_table[] = {
6282     {"fcp", "IBM,vfc-client"},
6283     { "", "" }
6284 };
6285 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
6286
6287 static const struct dev_pm_ops ibmvfc_pm_ops = {
6288     .resume = ibmvfc_resume
6289 };
6290
6291 static struct vio_driver ibmvfc_driver = {
6292     .id_table = ibmvfc_device_table,
6293     .probe = ibmvfc_probe,
6294     .remove = ibmvfc_remove,
6295     .get_desired_dma = ibmvfc_get_desired_dma,
6296     .name = IBMVFC_NAME,
6297     .pm = &ibmvfc_pm_ops,
6298 };
6299
6300 static struct fc_function_template ibmvfc_transport_functions = {
6301     .show_host_fabric_name = 1,
6302     .show_host_node_name = 1,
6303     .show_host_port_name = 1,
6304     .show_host_supported_classes = 1,
6305     .show_host_port_type = 1,
6306     .show_host_port_id = 1,
6307     .show_host_maxframe_size = 1,
6308
6309     .get_host_port_state = ibmvfc_get_host_port_state,
6310     .show_host_port_state = 1,
6311
6312     .get_host_speed = ibmvfc_get_host_speed,
6313     .show_host_speed = 1,
6314
6315     .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
6316     .terminate_rport_io = ibmvfc_terminate_rport_io,
6317
6318     .show_rport_maxframe_size = 1,
6319     .show_rport_supported_classes = 1,
6320
6321     .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
6322     .show_rport_dev_loss_tmo = 1,
6323
6324     .get_starget_node_name = ibmvfc_get_starget_node_name,
6325     .show_starget_node_name = 1,
6326
6327     .get_starget_port_name = ibmvfc_get_starget_port_name,
6328     .show_starget_port_name = 1,
6329
6330     .get_starget_port_id = ibmvfc_get_starget_port_id,
6331     .show_starget_port_id = 1,
6332
6333     .bsg_request = ibmvfc_bsg_request,
6334     .bsg_timeout = ibmvfc_bsg_timeout,
6335 };
6336
6337 /**
6338  * ibmvfc_module_init - Initialize the ibmvfc module
6339  *
6340  * Return value:
6341  *  0 on success / other on failure
6342  **/
6343 static int __init ibmvfc_module_init(void)
6344 {
6345     int rc;
6346
6347     if (!firmware_has_feature(FW_FEATURE_VIO))
6348         return -ENODEV;
6349
6350     printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
6351            IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
6352
6353     ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
6354     if (!ibmvfc_transport_template)
6355         return -ENOMEM;
6356
6357     rc = vio_register_driver(&ibmvfc_driver);
6358     if (rc)
6359         fc_release_transport(ibmvfc_transport_template);
6360     return rc;
6361 }
6362
6363 /**
6364  * ibmvfc_module_exit - Teardown the ibmvfc module
6365  *
6366  * Return value:
6367  *  nothing
6368  **/
6369 static void __exit ibmvfc_module_exit(void)
6370 {
6371     vio_unregister_driver(&ibmvfc_driver);
6372     fc_release_transport(ibmvfc_transport_template);
6373 }
6374
6375 module_init(ibmvfc_module_init);
6376 module_exit(ibmvfc_module_exit);