1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter 4 * 5 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation 6 * 7 * Copyright (C) IBM Corporation, 2008 8 */ 9 10 #include <linux/module.h> 11 #include <linux/moduleparam.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/dmapool.h> 14 #include <linux/delay.h> 15 #include <linux/interrupt.h> 16 #include <linux/kthread.h> 17 #include <linux/slab.h> 18 #include <linux/of.h> 19 #include <linux/pm.h> 20 #include <linux/stringify.h> 21 #include <linux/bsg-lib.h> 22 #include <asm/firmware.h> 23 #include <asm/irq.h> 24 #include <asm/rtas.h> 25 #include <asm/vio.h> 26 #include <scsi/scsi.h> 27 #include <scsi/scsi_cmnd.h> 28 #include <scsi/scsi_host.h> 29 #include <scsi/scsi_device.h> 30 #include <scsi/scsi_tcq.h> 31 #include <scsi/scsi_transport_fc.h> 32 #include <scsi/scsi_bsg_fc.h> 33 #include "ibmvfc.h" 34 35 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT; 36 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT; 37 static u64 max_lun = IBMVFC_MAX_LUN; 38 static unsigned int max_targets = IBMVFC_MAX_TARGETS; 39 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT; 40 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS; 41 static unsigned int ibmvfc_debug = IBMVFC_DEBUG; 42 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL; 43 static unsigned int cls3_error = IBMVFC_CLS3_ERROR; 44 static unsigned int mq_enabled = IBMVFC_MQ; 45 static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES; 46 static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS; 47 static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ; 48 static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M; 49 50 static LIST_HEAD(ibmvfc_head); 51 static DEFINE_SPINLOCK(ibmvfc_driver_lock); 52 static struct scsi_transport_template *ibmvfc_transport_template; 53 54 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver"); 55 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>"); 56 MODULE_LICENSE("GPL"); 57 MODULE_VERSION(IBMVFC_DRIVER_VERSION); 58 59 module_param_named(mq, mq_enabled, uint, S_IRUGO); 60 MODULE_PARM_DESC(mq, "Enable multiqueue support. " 61 "[Default=" __stringify(IBMVFC_MQ) "]"); 62 module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO); 63 MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. " 64 "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]"); 65 module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO); 66 MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. " 67 "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]"); 68 module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO); 69 MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. " 70 "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]"); 71 module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO); 72 MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. " 73 "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]"); 74 75 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR); 76 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. " 77 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]"); 78 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR); 79 MODULE_PARM_DESC(default_timeout, 80 "Default timeout in seconds for initialization and EH commands. " 81 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]"); 82 module_param_named(max_requests, max_requests, uint, S_IRUGO); 83 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. " 84 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]"); 85 module_param_named(max_lun, max_lun, ullong, S_IRUGO); 86 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. " 87 "[Default=" __stringify(IBMVFC_MAX_LUN) "]"); 88 module_param_named(max_targets, max_targets, uint, S_IRUGO); 89 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. " 90 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]"); 91 module_param_named(disc_threads, disc_threads, uint, S_IRUGO); 92 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. " 93 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]"); 94 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR); 95 MODULE_PARM_DESC(debug, "Enable driver debug information. " 96 "[Default=" __stringify(IBMVFC_DEBUG) "]"); 97 module_param_named(log_level, log_level, uint, 0); 98 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. " 99 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]"); 100 module_param_named(cls3_error, cls3_error, uint, 0); 101 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. " 102 "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]"); 103 104 static const struct { 105 u16 status; 106 u16 error; 107 u8 result; 108 u8 retry; 109 int log; 110 char *name; 111 } cmd_status [] = { 112 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" }, 113 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" }, 114 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" }, 115 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" }, 116 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" }, 117 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" }, 118 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" }, 119 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" }, 120 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" }, 121 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" }, 122 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" }, 123 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" }, 124 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" }, 125 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" }, 126 127 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" }, 128 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" }, 129 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" }, 130 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" }, 131 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" }, 132 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" }, 133 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" }, 134 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" }, 135 { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" }, 136 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" }, 137 138 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" }, 139 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" }, 140 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" }, 141 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" }, 142 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" }, 143 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" }, 144 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" }, 145 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" }, 146 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" }, 147 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" }, 148 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" }, 149 150 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" }, 151 { IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." }, 152 }; 153 154 static void ibmvfc_npiv_login(struct ibmvfc_host *); 155 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *); 156 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *); 157 static void ibmvfc_tgt_query_target(struct ibmvfc_target *); 158 static void ibmvfc_npiv_logout(struct ibmvfc_host *); 159 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *); 160 static void ibmvfc_tgt_move_login(struct ibmvfc_target *); 161 162 static void ibmvfc_release_sub_crqs(struct ibmvfc_host *); 163 static void ibmvfc_init_sub_crqs(struct ibmvfc_host *); 164 165 static const char *unknown_error = "unknown error"; 166 167 static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba, 168 unsigned long length, unsigned long *cookie, 169 unsigned long *irq) 170 { 171 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 172 long rc; 173 174 rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length); 175 *cookie = retbuf[0]; 176 *irq = retbuf[1]; 177 178 return rc; 179 } 180 181 static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags) 182 { 183 u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities); 184 185 return (host_caps & cap_flags) ? 1 : 0; 186 } 187 188 static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost, 189 struct ibmvfc_cmd *vfc_cmd) 190 { 191 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 192 return &vfc_cmd->v2.iu; 193 else 194 return &vfc_cmd->v1.iu; 195 } 196 197 static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost, 198 struct ibmvfc_cmd *vfc_cmd) 199 { 200 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 201 return &vfc_cmd->v2.rsp; 202 else 203 return &vfc_cmd->v1.rsp; 204 } 205 206 #ifdef CONFIG_SCSI_IBMVFC_TRACE 207 /** 208 * ibmvfc_trc_start - Log a start trace entry 209 * @evt: ibmvfc event struct 210 * 211 **/ 212 static void ibmvfc_trc_start(struct ibmvfc_event *evt) 213 { 214 struct ibmvfc_host *vhost = evt->vhost; 215 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; 216 struct ibmvfc_mad_common *mad = &evt->iu.mad_common; 217 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 218 struct ibmvfc_trace_entry *entry; 219 int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK; 220 221 entry = &vhost->trace[index]; 222 entry->evt = evt; 223 entry->time = jiffies; 224 entry->fmt = evt->crq.format; 225 entry->type = IBMVFC_TRC_START; 226 227 switch (entry->fmt) { 228 case IBMVFC_CMD_FORMAT: 229 entry->op_code = iu->cdb[0]; 230 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id); 231 entry->lun = scsilun_to_int(&iu->lun); 232 entry->tmf_flags = iu->tmf_flags; 233 entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len); 234 break; 235 case IBMVFC_MAD_FORMAT: 236 entry->op_code = be32_to_cpu(mad->opcode); 237 break; 238 default: 239 break; 240 } 241 } 242 243 /** 244 * ibmvfc_trc_end - Log an end trace entry 245 * @evt: ibmvfc event struct 246 * 247 **/ 248 static void ibmvfc_trc_end(struct ibmvfc_event *evt) 249 { 250 struct ibmvfc_host *vhost = evt->vhost; 251 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 252 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common; 253 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 254 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 255 struct ibmvfc_trace_entry *entry; 256 int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK; 257 258 entry = &vhost->trace[index]; 259 entry->evt = evt; 260 entry->time = jiffies; 261 entry->fmt = evt->crq.format; 262 entry->type = IBMVFC_TRC_END; 263 264 switch (entry->fmt) { 265 case IBMVFC_CMD_FORMAT: 266 entry->op_code = iu->cdb[0]; 267 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id); 268 entry->lun = scsilun_to_int(&iu->lun); 269 entry->tmf_flags = iu->tmf_flags; 270 entry->u.end.status = be16_to_cpu(vfc_cmd->status); 271 entry->u.end.error = be16_to_cpu(vfc_cmd->error); 272 entry->u.end.fcp_rsp_flags = rsp->flags; 273 entry->u.end.rsp_code = rsp->data.info.rsp_code; 274 entry->u.end.scsi_status = rsp->scsi_status; 275 break; 276 case IBMVFC_MAD_FORMAT: 277 entry->op_code = be32_to_cpu(mad->opcode); 278 entry->u.end.status = be16_to_cpu(mad->status); 279 break; 280 default: 281 break; 282 283 } 284 } 285 286 #else 287 #define ibmvfc_trc_start(evt) do { } while (0) 288 #define ibmvfc_trc_end(evt) do { } while (0) 289 #endif 290 291 /** 292 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response 293 * @status: status / error class 294 * @error: error 295 * 296 * Return value: 297 * index into cmd_status / -EINVAL on failure 298 **/ 299 static int ibmvfc_get_err_index(u16 status, u16 error) 300 { 301 int i; 302 303 for (i = 0; i < ARRAY_SIZE(cmd_status); i++) 304 if ((cmd_status[i].status & status) == cmd_status[i].status && 305 cmd_status[i].error == error) 306 return i; 307 308 return -EINVAL; 309 } 310 311 /** 312 * ibmvfc_get_cmd_error - Find the error description for the fcp response 313 * @status: status / error class 314 * @error: error 315 * 316 * Return value: 317 * error description string 318 **/ 319 static const char *ibmvfc_get_cmd_error(u16 status, u16 error) 320 { 321 int rc = ibmvfc_get_err_index(status, error); 322 if (rc >= 0) 323 return cmd_status[rc].name; 324 return unknown_error; 325 } 326 327 /** 328 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response 329 * @vfc_cmd: ibmvfc command struct 330 * 331 * Return value: 332 * SCSI result value to return for completed command 333 **/ 334 static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd) 335 { 336 int err; 337 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 338 int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len); 339 340 if ((rsp->flags & FCP_RSP_LEN_VALID) && 341 ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) || 342 rsp->data.info.rsp_code)) 343 return DID_ERROR << 16; 344 345 err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error)); 346 if (err >= 0) 347 return rsp->scsi_status | (cmd_status[err].result << 16); 348 return rsp->scsi_status | (DID_ERROR << 16); 349 } 350 351 /** 352 * ibmvfc_retry_cmd - Determine if error status is retryable 353 * @status: status / error class 354 * @error: error 355 * 356 * Return value: 357 * 1 if error should be retried / 0 if it should not 358 **/ 359 static int ibmvfc_retry_cmd(u16 status, u16 error) 360 { 361 int rc = ibmvfc_get_err_index(status, error); 362 363 if (rc >= 0) 364 return cmd_status[rc].retry; 365 return 1; 366 } 367 368 static const char *unknown_fc_explain = "unknown fc explain"; 369 370 static const struct { 371 u16 fc_explain; 372 char *name; 373 } ls_explain [] = { 374 { 0x00, "no additional explanation" }, 375 { 0x01, "service parameter error - options" }, 376 { 0x03, "service parameter error - initiator control" }, 377 { 0x05, "service parameter error - recipient control" }, 378 { 0x07, "service parameter error - received data field size" }, 379 { 0x09, "service parameter error - concurrent seq" }, 380 { 0x0B, "service parameter error - credit" }, 381 { 0x0D, "invalid N_Port/F_Port_Name" }, 382 { 0x0E, "invalid node/Fabric Name" }, 383 { 0x0F, "invalid common service parameters" }, 384 { 0x11, "invalid association header" }, 385 { 0x13, "association header required" }, 386 { 0x15, "invalid originator S_ID" }, 387 { 0x17, "invalid OX_ID-RX-ID combination" }, 388 { 0x19, "command (request) already in progress" }, 389 { 0x1E, "N_Port Login requested" }, 390 { 0x1F, "Invalid N_Port_ID" }, 391 }; 392 393 static const struct { 394 u16 fc_explain; 395 char *name; 396 } gs_explain [] = { 397 { 0x00, "no additional explanation" }, 398 { 0x01, "port identifier not registered" }, 399 { 0x02, "port name not registered" }, 400 { 0x03, "node name not registered" }, 401 { 0x04, "class of service not registered" }, 402 { 0x06, "initial process associator not registered" }, 403 { 0x07, "FC-4 TYPEs not registered" }, 404 { 0x08, "symbolic port name not registered" }, 405 { 0x09, "symbolic node name not registered" }, 406 { 0x0A, "port type not registered" }, 407 { 0xF0, "authorization exception" }, 408 { 0xF1, "authentication exception" }, 409 { 0xF2, "data base full" }, 410 { 0xF3, "data base empty" }, 411 { 0xF4, "processing request" }, 412 { 0xF5, "unable to verify connection" }, 413 { 0xF6, "devices not in a common zone" }, 414 }; 415 416 /** 417 * ibmvfc_get_ls_explain - Return the FC Explain description text 418 * @status: FC Explain status 419 * 420 * Returns: 421 * error string 422 **/ 423 static const char *ibmvfc_get_ls_explain(u16 status) 424 { 425 int i; 426 427 for (i = 0; i < ARRAY_SIZE(ls_explain); i++) 428 if (ls_explain[i].fc_explain == status) 429 return ls_explain[i].name; 430 431 return unknown_fc_explain; 432 } 433 434 /** 435 * ibmvfc_get_gs_explain - Return the FC Explain description text 436 * @status: FC Explain status 437 * 438 * Returns: 439 * error string 440 **/ 441 static const char *ibmvfc_get_gs_explain(u16 status) 442 { 443 int i; 444 445 for (i = 0; i < ARRAY_SIZE(gs_explain); i++) 446 if (gs_explain[i].fc_explain == status) 447 return gs_explain[i].name; 448 449 return unknown_fc_explain; 450 } 451 452 static const struct { 453 enum ibmvfc_fc_type fc_type; 454 char *name; 455 } fc_type [] = { 456 { IBMVFC_FABRIC_REJECT, "fabric reject" }, 457 { IBMVFC_PORT_REJECT, "port reject" }, 458 { IBMVFC_LS_REJECT, "ELS reject" }, 459 { IBMVFC_FABRIC_BUSY, "fabric busy" }, 460 { IBMVFC_PORT_BUSY, "port busy" }, 461 { IBMVFC_BASIC_REJECT, "basic reject" }, 462 }; 463 464 static const char *unknown_fc_type = "unknown fc type"; 465 466 /** 467 * ibmvfc_get_fc_type - Return the FC Type description text 468 * @status: FC Type error status 469 * 470 * Returns: 471 * error string 472 **/ 473 static const char *ibmvfc_get_fc_type(u16 status) 474 { 475 int i; 476 477 for (i = 0; i < ARRAY_SIZE(fc_type); i++) 478 if (fc_type[i].fc_type == status) 479 return fc_type[i].name; 480 481 return unknown_fc_type; 482 } 483 484 /** 485 * ibmvfc_set_tgt_action - Set the next init action for the target 486 * @tgt: ibmvfc target struct 487 * @action: action to perform 488 * 489 * Returns: 490 * 0 if action changed / non-zero if not changed 491 **/ 492 static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt, 493 enum ibmvfc_target_action action) 494 { 495 int rc = -EINVAL; 496 497 switch (tgt->action) { 498 case IBMVFC_TGT_ACTION_LOGOUT_RPORT: 499 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT || 500 action == IBMVFC_TGT_ACTION_DEL_RPORT) { 501 tgt->action = action; 502 rc = 0; 503 } 504 break; 505 case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT: 506 if (action == IBMVFC_TGT_ACTION_DEL_RPORT || 507 action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) { 508 tgt->action = action; 509 rc = 0; 510 } 511 break; 512 case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT: 513 if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) { 514 tgt->action = action; 515 rc = 0; 516 } 517 break; 518 case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT: 519 if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) { 520 tgt->action = action; 521 rc = 0; 522 } 523 break; 524 case IBMVFC_TGT_ACTION_DEL_RPORT: 525 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) { 526 tgt->action = action; 527 rc = 0; 528 } 529 break; 530 case IBMVFC_TGT_ACTION_DELETED_RPORT: 531 break; 532 default: 533 tgt->action = action; 534 rc = 0; 535 break; 536 } 537 538 if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT) 539 tgt->add_rport = 0; 540 541 return rc; 542 } 543 544 /** 545 * ibmvfc_set_host_state - Set the state for the host 546 * @vhost: ibmvfc host struct 547 * @state: state to set host to 548 * 549 * Returns: 550 * 0 if state changed / non-zero if not changed 551 **/ 552 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost, 553 enum ibmvfc_host_state state) 554 { 555 int rc = 0; 556 557 switch (vhost->state) { 558 case IBMVFC_HOST_OFFLINE: 559 rc = -EINVAL; 560 break; 561 default: 562 vhost->state = state; 563 break; 564 } 565 566 return rc; 567 } 568 569 /** 570 * ibmvfc_set_host_action - Set the next init action for the host 571 * @vhost: ibmvfc host struct 572 * @action: action to perform 573 * 574 **/ 575 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost, 576 enum ibmvfc_host_action action) 577 { 578 switch (action) { 579 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 580 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) 581 vhost->action = action; 582 break; 583 case IBMVFC_HOST_ACTION_LOGO_WAIT: 584 if (vhost->action == IBMVFC_HOST_ACTION_LOGO) 585 vhost->action = action; 586 break; 587 case IBMVFC_HOST_ACTION_INIT_WAIT: 588 if (vhost->action == IBMVFC_HOST_ACTION_INIT) 589 vhost->action = action; 590 break; 591 case IBMVFC_HOST_ACTION_QUERY: 592 switch (vhost->action) { 593 case IBMVFC_HOST_ACTION_INIT_WAIT: 594 case IBMVFC_HOST_ACTION_NONE: 595 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 596 vhost->action = action; 597 break; 598 default: 599 break; 600 } 601 break; 602 case IBMVFC_HOST_ACTION_TGT_INIT: 603 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS) 604 vhost->action = action; 605 break; 606 case IBMVFC_HOST_ACTION_INIT: 607 case IBMVFC_HOST_ACTION_TGT_DEL: 608 switch (vhost->action) { 609 case IBMVFC_HOST_ACTION_RESET: 610 case IBMVFC_HOST_ACTION_REENABLE: 611 break; 612 default: 613 vhost->action = action; 614 break; 615 } 616 break; 617 case IBMVFC_HOST_ACTION_LOGO: 618 case IBMVFC_HOST_ACTION_QUERY_TGTS: 619 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 620 case IBMVFC_HOST_ACTION_NONE: 621 case IBMVFC_HOST_ACTION_RESET: 622 case IBMVFC_HOST_ACTION_REENABLE: 623 default: 624 vhost->action = action; 625 break; 626 } 627 } 628 629 /** 630 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login) 631 * @vhost: ibmvfc host struct 632 * 633 * Return value: 634 * nothing 635 **/ 636 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost) 637 { 638 if (vhost->action == IBMVFC_HOST_ACTION_NONE && 639 vhost->state == IBMVFC_ACTIVE) { 640 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 641 scsi_block_requests(vhost->host); 642 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 643 } 644 } else 645 vhost->reinit = 1; 646 647 wake_up(&vhost->work_wait_q); 648 } 649 650 /** 651 * ibmvfc_del_tgt - Schedule cleanup and removal of the target 652 * @tgt: ibmvfc target struct 653 * @job_step: job step to perform 654 * 655 **/ 656 static void ibmvfc_del_tgt(struct ibmvfc_target *tgt) 657 { 658 if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) 659 tgt->job_step = ibmvfc_tgt_implicit_logout_and_del; 660 wake_up(&tgt->vhost->work_wait_q); 661 } 662 663 /** 664 * ibmvfc_link_down - Handle a link down event from the adapter 665 * @vhost: ibmvfc host struct 666 * @state: ibmvfc host state to enter 667 * 668 **/ 669 static void ibmvfc_link_down(struct ibmvfc_host *vhost, 670 enum ibmvfc_host_state state) 671 { 672 struct ibmvfc_target *tgt; 673 674 ENTER; 675 scsi_block_requests(vhost->host); 676 list_for_each_entry(tgt, &vhost->targets, queue) 677 ibmvfc_del_tgt(tgt); 678 ibmvfc_set_host_state(vhost, state); 679 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); 680 vhost->events_to_log |= IBMVFC_AE_LINKDOWN; 681 wake_up(&vhost->work_wait_q); 682 LEAVE; 683 } 684 685 /** 686 * ibmvfc_init_host - Start host initialization 687 * @vhost: ibmvfc host struct 688 * 689 * Return value: 690 * nothing 691 **/ 692 static void ibmvfc_init_host(struct ibmvfc_host *vhost) 693 { 694 struct ibmvfc_target *tgt; 695 696 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { 697 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { 698 dev_err(vhost->dev, 699 "Host initialization retries exceeded. Taking adapter offline\n"); 700 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 701 return; 702 } 703 } 704 705 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 706 memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE); 707 vhost->async_crq.cur = 0; 708 709 list_for_each_entry(tgt, &vhost->targets, queue) 710 ibmvfc_del_tgt(tgt); 711 scsi_block_requests(vhost->host); 712 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 713 vhost->job_step = ibmvfc_npiv_login; 714 wake_up(&vhost->work_wait_q); 715 } 716 } 717 718 /** 719 * ibmvfc_send_crq - Send a CRQ 720 * @vhost: ibmvfc host struct 721 * @word1: the first 64 bits of the data 722 * @word2: the second 64 bits of the data 723 * 724 * Return value: 725 * 0 on success / other on failure 726 **/ 727 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2) 728 { 729 struct vio_dev *vdev = to_vio_dev(vhost->dev); 730 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); 731 } 732 733 static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1, 734 u64 word2, u64 word3, u64 word4) 735 { 736 struct vio_dev *vdev = to_vio_dev(vhost->dev); 737 738 return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie, 739 word1, word2, word3, word4); 740 } 741 742 /** 743 * ibmvfc_send_crq_init - Send a CRQ init message 744 * @vhost: ibmvfc host struct 745 * 746 * Return value: 747 * 0 on success / other on failure 748 **/ 749 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost) 750 { 751 ibmvfc_dbg(vhost, "Sending CRQ init\n"); 752 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0); 753 } 754 755 /** 756 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message 757 * @vhost: ibmvfc host struct 758 * 759 * Return value: 760 * 0 on success / other on failure 761 **/ 762 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost) 763 { 764 ibmvfc_dbg(vhost, "Sending CRQ init complete\n"); 765 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0); 766 } 767 768 /** 769 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host 770 * @vhost: ibmvfc host who owns the event pool 771 * 772 * Returns zero on success. 773 **/ 774 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost, 775 struct ibmvfc_queue *queue, 776 unsigned int size) 777 { 778 int i; 779 struct ibmvfc_event_pool *pool = &queue->evt_pool; 780 781 ENTER; 782 if (!size) 783 return 0; 784 785 pool->size = size; 786 pool->events = kcalloc(size, sizeof(*pool->events), GFP_KERNEL); 787 if (!pool->events) 788 return -ENOMEM; 789 790 pool->iu_storage = dma_alloc_coherent(vhost->dev, 791 size * sizeof(*pool->iu_storage), 792 &pool->iu_token, 0); 793 794 if (!pool->iu_storage) { 795 kfree(pool->events); 796 return -ENOMEM; 797 } 798 799 INIT_LIST_HEAD(&queue->sent); 800 INIT_LIST_HEAD(&queue->free); 801 spin_lock_init(&queue->l_lock); 802 803 for (i = 0; i < size; ++i) { 804 struct ibmvfc_event *evt = &pool->events[i]; 805 806 atomic_set(&evt->free, 1); 807 evt->crq.valid = 0x80; 808 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i)); 809 evt->xfer_iu = pool->iu_storage + i; 810 evt->vhost = vhost; 811 evt->queue = queue; 812 evt->ext_list = NULL; 813 list_add_tail(&evt->queue_list, &queue->free); 814 } 815 816 LEAVE; 817 return 0; 818 } 819 820 /** 821 * ibmvfc_free_event_pool - Frees memory of the event pool of a host 822 * @vhost: ibmvfc host who owns the event pool 823 * 824 **/ 825 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost, 826 struct ibmvfc_queue *queue) 827 { 828 int i; 829 struct ibmvfc_event_pool *pool = &queue->evt_pool; 830 831 ENTER; 832 for (i = 0; i < pool->size; ++i) { 833 list_del(&pool->events[i].queue_list); 834 BUG_ON(atomic_read(&pool->events[i].free) != 1); 835 if (pool->events[i].ext_list) 836 dma_pool_free(vhost->sg_pool, 837 pool->events[i].ext_list, 838 pool->events[i].ext_list_token); 839 } 840 841 kfree(pool->events); 842 dma_free_coherent(vhost->dev, 843 pool->size * sizeof(*pool->iu_storage), 844 pool->iu_storage, pool->iu_token); 845 LEAVE; 846 } 847 848 /** 849 * ibmvfc_free_queue - Deallocate queue 850 * @vhost: ibmvfc host struct 851 * @queue: ibmvfc queue struct 852 * 853 * Unmaps dma and deallocates page for messages 854 **/ 855 static void ibmvfc_free_queue(struct ibmvfc_host *vhost, 856 struct ibmvfc_queue *queue) 857 { 858 struct device *dev = vhost->dev; 859 860 dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); 861 free_page((unsigned long)queue->msgs.handle); 862 queue->msgs.handle = NULL; 863 864 ibmvfc_free_event_pool(vhost, queue); 865 } 866 867 /** 868 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ 869 * @vhost: ibmvfc host struct 870 * 871 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters 872 * the crq with the hypervisor. 873 **/ 874 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost) 875 { 876 long rc = 0; 877 struct vio_dev *vdev = to_vio_dev(vhost->dev); 878 struct ibmvfc_queue *crq = &vhost->crq; 879 880 ibmvfc_dbg(vhost, "Releasing CRQ\n"); 881 free_irq(vdev->irq, vhost); 882 tasklet_kill(&vhost->tasklet); 883 do { 884 if (rc) 885 msleep(100); 886 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 887 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 888 889 vhost->state = IBMVFC_NO_CRQ; 890 vhost->logged_in = 0; 891 892 ibmvfc_free_queue(vhost, crq); 893 } 894 895 /** 896 * ibmvfc_reenable_crq_queue - reenables the CRQ 897 * @vhost: ibmvfc host struct 898 * 899 * Return value: 900 * 0 on success / other on failure 901 **/ 902 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost) 903 { 904 int rc = 0; 905 struct vio_dev *vdev = to_vio_dev(vhost->dev); 906 unsigned long flags; 907 908 ibmvfc_release_sub_crqs(vhost); 909 910 /* Re-enable the CRQ */ 911 do { 912 if (rc) 913 msleep(100); 914 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); 915 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); 916 917 if (rc) 918 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc); 919 920 spin_lock_irqsave(vhost->host->host_lock, flags); 921 spin_lock(vhost->crq.q_lock); 922 vhost->do_enquiry = 1; 923 vhost->using_channels = 0; 924 spin_unlock(vhost->crq.q_lock); 925 spin_unlock_irqrestore(vhost->host->host_lock, flags); 926 927 ibmvfc_init_sub_crqs(vhost); 928 929 return rc; 930 } 931 932 /** 933 * ibmvfc_reset_crq - resets a crq after a failure 934 * @vhost: ibmvfc host struct 935 * 936 * Return value: 937 * 0 on success / other on failure 938 **/ 939 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost) 940 { 941 int rc = 0; 942 unsigned long flags; 943 struct vio_dev *vdev = to_vio_dev(vhost->dev); 944 struct ibmvfc_queue *crq = &vhost->crq; 945 946 ibmvfc_release_sub_crqs(vhost); 947 948 /* Close the CRQ */ 949 do { 950 if (rc) 951 msleep(100); 952 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 953 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 954 955 spin_lock_irqsave(vhost->host->host_lock, flags); 956 spin_lock(vhost->crq.q_lock); 957 vhost->state = IBMVFC_NO_CRQ; 958 vhost->logged_in = 0; 959 vhost->do_enquiry = 1; 960 vhost->using_channels = 0; 961 962 /* Clean out the queue */ 963 memset(crq->msgs.crq, 0, PAGE_SIZE); 964 crq->cur = 0; 965 966 /* And re-open it again */ 967 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 968 crq->msg_token, PAGE_SIZE); 969 970 if (rc == H_CLOSED) 971 /* Adapter is good, but other end is not ready */ 972 dev_warn(vhost->dev, "Partner adapter not ready\n"); 973 else if (rc != 0) 974 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc); 975 976 spin_unlock(vhost->crq.q_lock); 977 spin_unlock_irqrestore(vhost->host->host_lock, flags); 978 979 ibmvfc_init_sub_crqs(vhost); 980 981 return rc; 982 } 983 984 /** 985 * ibmvfc_valid_event - Determines if event is valid. 986 * @pool: event_pool that contains the event 987 * @evt: ibmvfc event to be checked for validity 988 * 989 * Return value: 990 * 1 if event is valid / 0 if event is not valid 991 **/ 992 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool, 993 struct ibmvfc_event *evt) 994 { 995 int index = evt - pool->events; 996 if (index < 0 || index >= pool->size) /* outside of bounds */ 997 return 0; 998 if (evt != pool->events + index) /* unaligned */ 999 return 0; 1000 return 1; 1001 } 1002 1003 /** 1004 * ibmvfc_free_event - Free the specified event 1005 * @evt: ibmvfc_event to be freed 1006 * 1007 **/ 1008 static void ibmvfc_free_event(struct ibmvfc_event *evt) 1009 { 1010 struct ibmvfc_event_pool *pool = &evt->queue->evt_pool; 1011 unsigned long flags; 1012 1013 BUG_ON(!ibmvfc_valid_event(pool, evt)); 1014 BUG_ON(atomic_inc_return(&evt->free) != 1); 1015 1016 spin_lock_irqsave(&evt->queue->l_lock, flags); 1017 list_add_tail(&evt->queue_list, &evt->queue->free); 1018 if (evt->eh_comp) 1019 complete(evt->eh_comp); 1020 spin_unlock_irqrestore(&evt->queue->l_lock, flags); 1021 } 1022 1023 /** 1024 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands 1025 * @evt: ibmvfc event struct 1026 * 1027 * This function does not setup any error status, that must be done 1028 * before this function gets called. 1029 **/ 1030 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt) 1031 { 1032 struct scsi_cmnd *cmnd = evt->cmnd; 1033 1034 if (cmnd) { 1035 scsi_dma_unmap(cmnd); 1036 cmnd->scsi_done(cmnd); 1037 } 1038 1039 ibmvfc_free_event(evt); 1040 } 1041 1042 /** 1043 * ibmvfc_complete_purge - Complete failed command list 1044 * @purge_list: list head of failed commands 1045 * 1046 * This function runs completions on commands to fail as a result of a 1047 * host reset or platform migration. 1048 **/ 1049 static void ibmvfc_complete_purge(struct list_head *purge_list) 1050 { 1051 struct ibmvfc_event *evt, *pos; 1052 1053 list_for_each_entry_safe(evt, pos, purge_list, queue_list) { 1054 list_del(&evt->queue_list); 1055 ibmvfc_trc_end(evt); 1056 evt->done(evt); 1057 } 1058 } 1059 1060 /** 1061 * ibmvfc_fail_request - Fail request with specified error code 1062 * @evt: ibmvfc event struct 1063 * @error_code: error code to fail request with 1064 * 1065 * Return value: 1066 * none 1067 **/ 1068 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code) 1069 { 1070 if (evt->cmnd) { 1071 evt->cmnd->result = (error_code << 16); 1072 evt->done = ibmvfc_scsi_eh_done; 1073 } else 1074 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED); 1075 1076 del_timer(&evt->timer); 1077 } 1078 1079 /** 1080 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests 1081 * @vhost: ibmvfc host struct 1082 * @error_code: error code to fail requests with 1083 * 1084 * Return value: 1085 * none 1086 **/ 1087 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code) 1088 { 1089 struct ibmvfc_event *evt, *pos; 1090 struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs; 1091 unsigned long flags; 1092 int hwqs = 0; 1093 int i; 1094 1095 if (vhost->using_channels) 1096 hwqs = vhost->scsi_scrqs.active_queues; 1097 1098 ibmvfc_dbg(vhost, "Purging all requests\n"); 1099 spin_lock_irqsave(&vhost->crq.l_lock, flags); 1100 list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list) 1101 ibmvfc_fail_request(evt, error_code); 1102 list_splice_init(&vhost->crq.sent, &vhost->purge); 1103 spin_unlock_irqrestore(&vhost->crq.l_lock, flags); 1104 1105 for (i = 0; i < hwqs; i++) { 1106 spin_lock_irqsave(queues[i].q_lock, flags); 1107 spin_lock(&queues[i].l_lock); 1108 list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list) 1109 ibmvfc_fail_request(evt, error_code); 1110 list_splice_init(&queues[i].sent, &vhost->purge); 1111 spin_unlock(&queues[i].l_lock); 1112 spin_unlock_irqrestore(queues[i].q_lock, flags); 1113 } 1114 } 1115 1116 /** 1117 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ 1118 * @vhost: struct ibmvfc host to reset 1119 **/ 1120 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost) 1121 { 1122 ibmvfc_purge_requests(vhost, DID_ERROR); 1123 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 1124 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); 1125 } 1126 1127 /** 1128 * __ibmvfc_reset_host - Reset the connection to the server (no locking) 1129 * @vhost: struct ibmvfc host to reset 1130 **/ 1131 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost) 1132 { 1133 if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT && 1134 !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 1135 scsi_block_requests(vhost->host); 1136 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO); 1137 vhost->job_step = ibmvfc_npiv_logout; 1138 wake_up(&vhost->work_wait_q); 1139 } else 1140 ibmvfc_hard_reset_host(vhost); 1141 } 1142 1143 /** 1144 * ibmvfc_reset_host - Reset the connection to the server 1145 * @vhost: ibmvfc host struct 1146 **/ 1147 static void ibmvfc_reset_host(struct ibmvfc_host *vhost) 1148 { 1149 unsigned long flags; 1150 1151 spin_lock_irqsave(vhost->host->host_lock, flags); 1152 __ibmvfc_reset_host(vhost); 1153 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1154 } 1155 1156 /** 1157 * ibmvfc_retry_host_init - Retry host initialization if allowed 1158 * @vhost: ibmvfc host struct 1159 * 1160 * Returns: 1 if init will be retried / 0 if not 1161 * 1162 **/ 1163 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost) 1164 { 1165 int retry = 0; 1166 1167 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { 1168 vhost->delay_init = 1; 1169 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { 1170 dev_err(vhost->dev, 1171 "Host initialization retries exceeded. Taking adapter offline\n"); 1172 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 1173 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES) 1174 __ibmvfc_reset_host(vhost); 1175 else { 1176 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 1177 retry = 1; 1178 } 1179 } 1180 1181 wake_up(&vhost->work_wait_q); 1182 return retry; 1183 } 1184 1185 /** 1186 * __ibmvfc_get_target - Find the specified scsi_target (no locking) 1187 * @starget: scsi target struct 1188 * 1189 * Return value: 1190 * ibmvfc_target struct / NULL if not found 1191 **/ 1192 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget) 1193 { 1194 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 1195 struct ibmvfc_host *vhost = shost_priv(shost); 1196 struct ibmvfc_target *tgt; 1197 1198 list_for_each_entry(tgt, &vhost->targets, queue) 1199 if (tgt->target_id == starget->id) { 1200 kref_get(&tgt->kref); 1201 return tgt; 1202 } 1203 return NULL; 1204 } 1205 1206 /** 1207 * ibmvfc_get_target - Find the specified scsi_target 1208 * @starget: scsi target struct 1209 * 1210 * Return value: 1211 * ibmvfc_target struct / NULL if not found 1212 **/ 1213 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget) 1214 { 1215 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 1216 struct ibmvfc_target *tgt; 1217 unsigned long flags; 1218 1219 spin_lock_irqsave(shost->host_lock, flags); 1220 tgt = __ibmvfc_get_target(starget); 1221 spin_unlock_irqrestore(shost->host_lock, flags); 1222 return tgt; 1223 } 1224 1225 /** 1226 * ibmvfc_get_host_speed - Get host port speed 1227 * @shost: scsi host struct 1228 * 1229 * Return value: 1230 * none 1231 **/ 1232 static void ibmvfc_get_host_speed(struct Scsi_Host *shost) 1233 { 1234 struct ibmvfc_host *vhost = shost_priv(shost); 1235 unsigned long flags; 1236 1237 spin_lock_irqsave(shost->host_lock, flags); 1238 if (vhost->state == IBMVFC_ACTIVE) { 1239 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) { 1240 case 1: 1241 fc_host_speed(shost) = FC_PORTSPEED_1GBIT; 1242 break; 1243 case 2: 1244 fc_host_speed(shost) = FC_PORTSPEED_2GBIT; 1245 break; 1246 case 4: 1247 fc_host_speed(shost) = FC_PORTSPEED_4GBIT; 1248 break; 1249 case 8: 1250 fc_host_speed(shost) = FC_PORTSPEED_8GBIT; 1251 break; 1252 case 10: 1253 fc_host_speed(shost) = FC_PORTSPEED_10GBIT; 1254 break; 1255 case 16: 1256 fc_host_speed(shost) = FC_PORTSPEED_16GBIT; 1257 break; 1258 default: 1259 ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n", 1260 be64_to_cpu(vhost->login_buf->resp.link_speed) / 100); 1261 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; 1262 break; 1263 } 1264 } else 1265 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; 1266 spin_unlock_irqrestore(shost->host_lock, flags); 1267 } 1268 1269 /** 1270 * ibmvfc_get_host_port_state - Get host port state 1271 * @shost: scsi host struct 1272 * 1273 * Return value: 1274 * none 1275 **/ 1276 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost) 1277 { 1278 struct ibmvfc_host *vhost = shost_priv(shost); 1279 unsigned long flags; 1280 1281 spin_lock_irqsave(shost->host_lock, flags); 1282 switch (vhost->state) { 1283 case IBMVFC_INITIALIZING: 1284 case IBMVFC_ACTIVE: 1285 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 1286 break; 1287 case IBMVFC_LINK_DOWN: 1288 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 1289 break; 1290 case IBMVFC_LINK_DEAD: 1291 case IBMVFC_HOST_OFFLINE: 1292 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; 1293 break; 1294 case IBMVFC_HALTED: 1295 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED; 1296 break; 1297 case IBMVFC_NO_CRQ: 1298 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 1299 break; 1300 default: 1301 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state); 1302 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 1303 break; 1304 } 1305 spin_unlock_irqrestore(shost->host_lock, flags); 1306 } 1307 1308 /** 1309 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout 1310 * @rport: rport struct 1311 * @timeout: timeout value 1312 * 1313 * Return value: 1314 * none 1315 **/ 1316 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 1317 { 1318 if (timeout) 1319 rport->dev_loss_tmo = timeout; 1320 else 1321 rport->dev_loss_tmo = 1; 1322 } 1323 1324 /** 1325 * ibmvfc_release_tgt - Free memory allocated for a target 1326 * @kref: kref struct 1327 * 1328 **/ 1329 static void ibmvfc_release_tgt(struct kref *kref) 1330 { 1331 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref); 1332 kfree(tgt); 1333 } 1334 1335 /** 1336 * ibmvfc_get_starget_node_name - Get SCSI target's node name 1337 * @starget: scsi target struct 1338 * 1339 * Return value: 1340 * none 1341 **/ 1342 static void ibmvfc_get_starget_node_name(struct scsi_target *starget) 1343 { 1344 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1345 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0; 1346 if (tgt) 1347 kref_put(&tgt->kref, ibmvfc_release_tgt); 1348 } 1349 1350 /** 1351 * ibmvfc_get_starget_port_name - Get SCSI target's port name 1352 * @starget: scsi target struct 1353 * 1354 * Return value: 1355 * none 1356 **/ 1357 static void ibmvfc_get_starget_port_name(struct scsi_target *starget) 1358 { 1359 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1360 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0; 1361 if (tgt) 1362 kref_put(&tgt->kref, ibmvfc_release_tgt); 1363 } 1364 1365 /** 1366 * ibmvfc_get_starget_port_id - Get SCSI target's port ID 1367 * @starget: scsi target struct 1368 * 1369 * Return value: 1370 * none 1371 **/ 1372 static void ibmvfc_get_starget_port_id(struct scsi_target *starget) 1373 { 1374 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1375 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1; 1376 if (tgt) 1377 kref_put(&tgt->kref, ibmvfc_release_tgt); 1378 } 1379 1380 /** 1381 * ibmvfc_wait_while_resetting - Wait while the host resets 1382 * @vhost: ibmvfc host struct 1383 * 1384 * Return value: 1385 * 0 on success / other on failure 1386 **/ 1387 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost) 1388 { 1389 long timeout = wait_event_timeout(vhost->init_wait_q, 1390 ((vhost->state == IBMVFC_ACTIVE || 1391 vhost->state == IBMVFC_HOST_OFFLINE || 1392 vhost->state == IBMVFC_LINK_DEAD) && 1393 vhost->action == IBMVFC_HOST_ACTION_NONE), 1394 (init_timeout * HZ)); 1395 1396 return timeout ? 0 : -EIO; 1397 } 1398 1399 /** 1400 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization 1401 * @shost: scsi host struct 1402 * 1403 * Return value: 1404 * 0 on success / other on failure 1405 **/ 1406 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost) 1407 { 1408 struct ibmvfc_host *vhost = shost_priv(shost); 1409 1410 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n"); 1411 ibmvfc_reset_host(vhost); 1412 return ibmvfc_wait_while_resetting(vhost); 1413 } 1414 1415 /** 1416 * ibmvfc_gather_partition_info - Gather info about the LPAR 1417 * 1418 * Return value: 1419 * none 1420 **/ 1421 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost) 1422 { 1423 struct device_node *rootdn; 1424 const char *name; 1425 const unsigned int *num; 1426 1427 rootdn = of_find_node_by_path("/"); 1428 if (!rootdn) 1429 return; 1430 1431 name = of_get_property(rootdn, "ibm,partition-name", NULL); 1432 if (name) 1433 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name)); 1434 num = of_get_property(rootdn, "ibm,partition-no", NULL); 1435 if (num) 1436 vhost->partition_number = *num; 1437 of_node_put(rootdn); 1438 } 1439 1440 /** 1441 * ibmvfc_set_login_info - Setup info for NPIV login 1442 * @vhost: ibmvfc host struct 1443 * 1444 * Return value: 1445 * none 1446 **/ 1447 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost) 1448 { 1449 struct ibmvfc_npiv_login *login_info = &vhost->login_info; 1450 struct ibmvfc_queue *async_crq = &vhost->async_crq; 1451 struct device_node *of_node = vhost->dev->of_node; 1452 const char *location; 1453 1454 memset(login_info, 0, sizeof(*login_info)); 1455 1456 login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX); 1457 login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9); 1458 login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu)); 1459 login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp)); 1460 login_info->partition_num = cpu_to_be32(vhost->partition_number); 1461 login_info->vfc_frame_version = cpu_to_be32(1); 1462 login_info->fcp_version = cpu_to_be16(3); 1463 login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT); 1464 if (vhost->client_migrated) 1465 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED); 1466 1467 login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ); 1468 login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN); 1469 1470 if (vhost->mq_enabled || vhost->using_channels) 1471 login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS); 1472 1473 login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token); 1474 login_info->async.len = cpu_to_be32(async_crq->size * 1475 sizeof(*async_crq->msgs.async)); 1476 strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME); 1477 strncpy(login_info->device_name, 1478 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME); 1479 1480 location = of_get_property(of_node, "ibm,loc-code", NULL); 1481 location = location ? location : dev_name(vhost->dev); 1482 strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME); 1483 } 1484 1485 /** 1486 * ibmvfc_get_event - Gets the next free event in pool 1487 * @vhost: ibmvfc host struct 1488 * 1489 * Returns a free event from the pool. 1490 **/ 1491 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_queue *queue) 1492 { 1493 struct ibmvfc_event *evt; 1494 unsigned long flags; 1495 1496 spin_lock_irqsave(&queue->l_lock, flags); 1497 BUG_ON(list_empty(&queue->free)); 1498 evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list); 1499 atomic_set(&evt->free, 0); 1500 list_del(&evt->queue_list); 1501 spin_unlock_irqrestore(&queue->l_lock, flags); 1502 return evt; 1503 } 1504 1505 /** 1506 * ibmvfc_locked_done - Calls evt completion with host_lock held 1507 * @evt: ibmvfc evt to complete 1508 * 1509 * All non-scsi command completion callbacks have the expectation that the 1510 * host_lock is held. This callback is used by ibmvfc_init_event to wrap a 1511 * MAD evt with the host_lock. 1512 **/ 1513 static void ibmvfc_locked_done(struct ibmvfc_event *evt) 1514 { 1515 unsigned long flags; 1516 1517 spin_lock_irqsave(evt->vhost->host->host_lock, flags); 1518 evt->_done(evt); 1519 spin_unlock_irqrestore(evt->vhost->host->host_lock, flags); 1520 } 1521 1522 /** 1523 * ibmvfc_init_event - Initialize fields in an event struct that are always 1524 * required. 1525 * @evt: The event 1526 * @done: Routine to call when the event is responded to 1527 * @format: SRP or MAD format 1528 **/ 1529 static void ibmvfc_init_event(struct ibmvfc_event *evt, 1530 void (*done) (struct ibmvfc_event *), u8 format) 1531 { 1532 evt->cmnd = NULL; 1533 evt->sync_iu = NULL; 1534 evt->eh_comp = NULL; 1535 evt->crq.format = format; 1536 if (format == IBMVFC_CMD_FORMAT) 1537 evt->done = done; 1538 else { 1539 evt->_done = done; 1540 evt->done = ibmvfc_locked_done; 1541 } 1542 evt->hwq = 0; 1543 } 1544 1545 /** 1546 * ibmvfc_map_sg_list - Initialize scatterlist 1547 * @scmd: scsi command struct 1548 * @nseg: number of scatterlist segments 1549 * @md: memory descriptor list to initialize 1550 **/ 1551 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg, 1552 struct srp_direct_buf *md) 1553 { 1554 int i; 1555 struct scatterlist *sg; 1556 1557 scsi_for_each_sg(scmd, sg, nseg, i) { 1558 md[i].va = cpu_to_be64(sg_dma_address(sg)); 1559 md[i].len = cpu_to_be32(sg_dma_len(sg)); 1560 md[i].key = 0; 1561 } 1562 } 1563 1564 /** 1565 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields 1566 * @scmd: struct scsi_cmnd with the scatterlist 1567 * @evt: ibmvfc event struct 1568 * @vfc_cmd: vfc_cmd that contains the memory descriptor 1569 * @dev: device for which to map dma memory 1570 * 1571 * Returns: 1572 * 0 on success / non-zero on failure 1573 **/ 1574 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd, 1575 struct ibmvfc_event *evt, 1576 struct ibmvfc_cmd *vfc_cmd, struct device *dev) 1577 { 1578 1579 int sg_mapped; 1580 struct srp_direct_buf *data = &vfc_cmd->ioba; 1581 struct ibmvfc_host *vhost = dev_get_drvdata(dev); 1582 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd); 1583 1584 if (cls3_error) 1585 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR); 1586 1587 sg_mapped = scsi_dma_map(scmd); 1588 if (!sg_mapped) { 1589 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC); 1590 return 0; 1591 } else if (unlikely(sg_mapped < 0)) { 1592 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1593 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n"); 1594 return sg_mapped; 1595 } 1596 1597 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 1598 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE); 1599 iu->add_cdb_len |= IBMVFC_WRDATA; 1600 } else { 1601 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ); 1602 iu->add_cdb_len |= IBMVFC_RDDATA; 1603 } 1604 1605 if (sg_mapped == 1) { 1606 ibmvfc_map_sg_list(scmd, sg_mapped, data); 1607 return 0; 1608 } 1609 1610 vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST); 1611 1612 if (!evt->ext_list) { 1613 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC, 1614 &evt->ext_list_token); 1615 1616 if (!evt->ext_list) { 1617 scsi_dma_unmap(scmd); 1618 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1619 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n"); 1620 return -ENOMEM; 1621 } 1622 } 1623 1624 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list); 1625 1626 data->va = cpu_to_be64(evt->ext_list_token); 1627 data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf)); 1628 data->key = 0; 1629 return 0; 1630 } 1631 1632 /** 1633 * ibmvfc_timeout - Internal command timeout handler 1634 * @evt: struct ibmvfc_event that timed out 1635 * 1636 * Called when an internally generated command times out 1637 **/ 1638 static void ibmvfc_timeout(struct timer_list *t) 1639 { 1640 struct ibmvfc_event *evt = from_timer(evt, t, timer); 1641 struct ibmvfc_host *vhost = evt->vhost; 1642 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt); 1643 ibmvfc_reset_host(vhost); 1644 } 1645 1646 /** 1647 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq() 1648 * @evt: event to be sent 1649 * @vhost: ibmvfc host struct 1650 * @timeout: timeout in seconds - 0 means do not time command 1651 * 1652 * Returns the value returned from ibmvfc_send_crq(). (Zero for success) 1653 **/ 1654 static int ibmvfc_send_event(struct ibmvfc_event *evt, 1655 struct ibmvfc_host *vhost, unsigned long timeout) 1656 { 1657 __be64 *crq_as_u64 = (__be64 *) &evt->crq; 1658 unsigned long flags; 1659 int rc; 1660 1661 /* Copy the IU into the transfer area */ 1662 *evt->xfer_iu = evt->iu; 1663 if (evt->crq.format == IBMVFC_CMD_FORMAT) 1664 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt); 1665 else if (evt->crq.format == IBMVFC_MAD_FORMAT) 1666 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt); 1667 else 1668 BUG(); 1669 1670 timer_setup(&evt->timer, ibmvfc_timeout, 0); 1671 1672 if (timeout) { 1673 evt->timer.expires = jiffies + (timeout * HZ); 1674 add_timer(&evt->timer); 1675 } 1676 1677 spin_lock_irqsave(&evt->queue->l_lock, flags); 1678 list_add_tail(&evt->queue_list, &evt->queue->sent); 1679 1680 mb(); 1681 1682 if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT) 1683 rc = ibmvfc_send_sub_crq(vhost, 1684 evt->queue->vios_cookie, 1685 be64_to_cpu(crq_as_u64[0]), 1686 be64_to_cpu(crq_as_u64[1]), 1687 0, 0); 1688 else 1689 rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]), 1690 be64_to_cpu(crq_as_u64[1])); 1691 1692 if (rc) { 1693 list_del(&evt->queue_list); 1694 spin_unlock_irqrestore(&evt->queue->l_lock, flags); 1695 del_timer(&evt->timer); 1696 1697 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. 1698 * Firmware will send a CRQ with a transport event (0xFF) to 1699 * tell this client what has happened to the transport. This 1700 * will be handled in ibmvfc_handle_crq() 1701 */ 1702 if (rc == H_CLOSED) { 1703 if (printk_ratelimit()) 1704 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n"); 1705 if (evt->cmnd) 1706 scsi_dma_unmap(evt->cmnd); 1707 ibmvfc_free_event(evt); 1708 return SCSI_MLQUEUE_HOST_BUSY; 1709 } 1710 1711 dev_err(vhost->dev, "Send error (rc=%d)\n", rc); 1712 if (evt->cmnd) { 1713 evt->cmnd->result = DID_ERROR << 16; 1714 evt->done = ibmvfc_scsi_eh_done; 1715 } else 1716 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR); 1717 1718 evt->done(evt); 1719 } else { 1720 spin_unlock_irqrestore(&evt->queue->l_lock, flags); 1721 ibmvfc_trc_start(evt); 1722 } 1723 1724 return 0; 1725 } 1726 1727 /** 1728 * ibmvfc_log_error - Log an error for the failed command if appropriate 1729 * @evt: ibmvfc event to log 1730 * 1731 **/ 1732 static void ibmvfc_log_error(struct ibmvfc_event *evt) 1733 { 1734 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 1735 struct ibmvfc_host *vhost = evt->vhost; 1736 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 1737 struct scsi_cmnd *cmnd = evt->cmnd; 1738 const char *err = unknown_error; 1739 int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error)); 1740 int logerr = 0; 1741 int rsp_code = 0; 1742 1743 if (index >= 0) { 1744 logerr = cmd_status[index].log; 1745 err = cmd_status[index].name; 1746 } 1747 1748 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1))) 1749 return; 1750 1751 if (rsp->flags & FCP_RSP_LEN_VALID) 1752 rsp_code = rsp->data.info.rsp_code; 1753 1754 scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) " 1755 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n", 1756 cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error), 1757 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status); 1758 } 1759 1760 /** 1761 * ibmvfc_relogin - Log back into the specified device 1762 * @sdev: scsi device struct 1763 * 1764 **/ 1765 static void ibmvfc_relogin(struct scsi_device *sdev) 1766 { 1767 struct ibmvfc_host *vhost = shost_priv(sdev->host); 1768 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 1769 struct ibmvfc_target *tgt; 1770 unsigned long flags; 1771 1772 spin_lock_irqsave(vhost->host->host_lock, flags); 1773 list_for_each_entry(tgt, &vhost->targets, queue) { 1774 if (rport == tgt->rport) { 1775 ibmvfc_del_tgt(tgt); 1776 break; 1777 } 1778 } 1779 1780 ibmvfc_reinit_host(vhost); 1781 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1782 } 1783 1784 /** 1785 * ibmvfc_scsi_done - Handle responses from commands 1786 * @evt: ibmvfc event to be handled 1787 * 1788 * Used as a callback when sending scsi cmds. 1789 **/ 1790 static void ibmvfc_scsi_done(struct ibmvfc_event *evt) 1791 { 1792 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 1793 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd); 1794 struct scsi_cmnd *cmnd = evt->cmnd; 1795 u32 rsp_len = 0; 1796 u32 sense_len = be32_to_cpu(rsp->fcp_sense_len); 1797 1798 if (cmnd) { 1799 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID) 1800 scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid)); 1801 else if (rsp->flags & FCP_RESID_UNDER) 1802 scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid)); 1803 else 1804 scsi_set_resid(cmnd, 0); 1805 1806 if (vfc_cmd->status) { 1807 cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd); 1808 1809 if (rsp->flags & FCP_RSP_LEN_VALID) 1810 rsp_len = be32_to_cpu(rsp->fcp_rsp_len); 1811 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE) 1812 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len; 1813 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8) 1814 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len); 1815 if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) && 1816 (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED)) 1817 ibmvfc_relogin(cmnd->device); 1818 1819 if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER))) 1820 cmnd->result = (DID_ERROR << 16); 1821 1822 ibmvfc_log_error(evt); 1823 } 1824 1825 if (!cmnd->result && 1826 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow)) 1827 cmnd->result = (DID_ERROR << 16); 1828 1829 scsi_dma_unmap(cmnd); 1830 cmnd->scsi_done(cmnd); 1831 } 1832 1833 ibmvfc_free_event(evt); 1834 } 1835 1836 /** 1837 * ibmvfc_host_chkready - Check if the host can accept commands 1838 * @vhost: struct ibmvfc host 1839 * 1840 * Returns: 1841 * 1 if host can accept command / 0 if not 1842 **/ 1843 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost) 1844 { 1845 int result = 0; 1846 1847 switch (vhost->state) { 1848 case IBMVFC_LINK_DEAD: 1849 case IBMVFC_HOST_OFFLINE: 1850 result = DID_NO_CONNECT << 16; 1851 break; 1852 case IBMVFC_NO_CRQ: 1853 case IBMVFC_INITIALIZING: 1854 case IBMVFC_HALTED: 1855 case IBMVFC_LINK_DOWN: 1856 result = DID_REQUEUE << 16; 1857 break; 1858 case IBMVFC_ACTIVE: 1859 result = 0; 1860 break; 1861 } 1862 1863 return result; 1864 } 1865 1866 static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev) 1867 { 1868 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 1869 struct ibmvfc_host *vhost = evt->vhost; 1870 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; 1871 struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 1872 struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd); 1873 size_t offset; 1874 1875 memset(vfc_cmd, 0, sizeof(*vfc_cmd)); 1876 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 1877 offset = offsetof(struct ibmvfc_cmd, v2.rsp); 1878 vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name); 1879 } else 1880 offset = offsetof(struct ibmvfc_cmd, v1.rsp); 1881 vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset); 1882 vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp)); 1883 vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE); 1884 vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu)); 1885 vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp)); 1886 vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata); 1887 vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id); 1888 int_to_scsilun(sdev->lun, &iu->lun); 1889 1890 return vfc_cmd; 1891 } 1892 1893 /** 1894 * ibmvfc_queuecommand - The queuecommand function of the scsi template 1895 * @cmnd: struct scsi_cmnd to be executed 1896 * @done: Callback function to be called when cmnd is completed 1897 * 1898 * Returns: 1899 * 0 on success / other on failure 1900 **/ 1901 static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd) 1902 { 1903 struct ibmvfc_host *vhost = shost_priv(shost); 1904 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device)); 1905 struct ibmvfc_cmd *vfc_cmd; 1906 struct ibmvfc_fcp_cmd_iu *iu; 1907 struct ibmvfc_event *evt; 1908 u32 tag_and_hwq = blk_mq_unique_tag(cmnd->request); 1909 u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq); 1910 u16 scsi_channel; 1911 int rc; 1912 1913 if (unlikely((rc = fc_remote_port_chkready(rport))) || 1914 unlikely((rc = ibmvfc_host_chkready(vhost)))) { 1915 cmnd->result = rc; 1916 cmnd->scsi_done(cmnd); 1917 return 0; 1918 } 1919 1920 cmnd->result = (DID_OK << 16); 1921 if (vhost->using_channels) { 1922 scsi_channel = hwq % vhost->scsi_scrqs.active_queues; 1923 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]); 1924 evt->hwq = hwq % vhost->scsi_scrqs.active_queues; 1925 } else 1926 evt = ibmvfc_get_event(&vhost->crq); 1927 1928 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT); 1929 evt->cmnd = cmnd; 1930 1931 vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device); 1932 iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd); 1933 1934 iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd)); 1935 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len); 1936 1937 if (cmnd->flags & SCMD_TAGGED) { 1938 vfc_cmd->task_tag = cpu_to_be64(cmnd->tag); 1939 iu->pri_task_attr = IBMVFC_SIMPLE_TASK; 1940 } 1941 1942 vfc_cmd->correlation = cpu_to_be64((u64)evt); 1943 1944 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev)))) 1945 return ibmvfc_send_event(evt, vhost, 0); 1946 1947 ibmvfc_free_event(evt); 1948 if (rc == -ENOMEM) 1949 return SCSI_MLQUEUE_HOST_BUSY; 1950 1951 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1952 scmd_printk(KERN_ERR, cmnd, 1953 "Failed to map DMA buffer for command. rc=%d\n", rc); 1954 1955 cmnd->result = DID_ERROR << 16; 1956 cmnd->scsi_done(cmnd); 1957 return 0; 1958 } 1959 1960 /** 1961 * ibmvfc_sync_completion - Signal that a synchronous command has completed 1962 * @evt: ibmvfc event struct 1963 * 1964 **/ 1965 static void ibmvfc_sync_completion(struct ibmvfc_event *evt) 1966 { 1967 /* copy the response back */ 1968 if (evt->sync_iu) 1969 *evt->sync_iu = *evt->xfer_iu; 1970 1971 complete(&evt->comp); 1972 } 1973 1974 /** 1975 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands 1976 * @evt: struct ibmvfc_event 1977 * 1978 **/ 1979 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt) 1980 { 1981 struct ibmvfc_host *vhost = evt->vhost; 1982 1983 ibmvfc_free_event(evt); 1984 vhost->aborting_passthru = 0; 1985 dev_info(vhost->dev, "Passthru command cancelled\n"); 1986 } 1987 1988 /** 1989 * ibmvfc_bsg_timeout - Handle a BSG timeout 1990 * @job: struct bsg_job that timed out 1991 * 1992 * Returns: 1993 * 0 on success / other on failure 1994 **/ 1995 static int ibmvfc_bsg_timeout(struct bsg_job *job) 1996 { 1997 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job)); 1998 unsigned long port_id = (unsigned long)job->dd_data; 1999 struct ibmvfc_event *evt; 2000 struct ibmvfc_tmf *tmf; 2001 unsigned long flags; 2002 int rc; 2003 2004 ENTER; 2005 spin_lock_irqsave(vhost->host->host_lock, flags); 2006 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) { 2007 __ibmvfc_reset_host(vhost); 2008 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2009 return 0; 2010 } 2011 2012 vhost->aborting_passthru = 1; 2013 evt = ibmvfc_get_event(&vhost->crq); 2014 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT); 2015 2016 tmf = &evt->iu.tmf; 2017 memset(tmf, 0, sizeof(*tmf)); 2018 tmf->common.version = cpu_to_be32(1); 2019 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); 2020 tmf->common.length = cpu_to_be16(sizeof(*tmf)); 2021 tmf->scsi_id = cpu_to_be64(port_id); 2022 tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY); 2023 tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY); 2024 rc = ibmvfc_send_event(evt, vhost, default_timeout); 2025 2026 if (rc != 0) { 2027 vhost->aborting_passthru = 0; 2028 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc); 2029 rc = -EIO; 2030 } else 2031 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n", 2032 port_id); 2033 2034 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2035 2036 LEAVE; 2037 return rc; 2038 } 2039 2040 /** 2041 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command 2042 * @vhost: struct ibmvfc_host to send command 2043 * @port_id: port ID to send command 2044 * 2045 * Returns: 2046 * 0 on success / other on failure 2047 **/ 2048 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id) 2049 { 2050 struct ibmvfc_port_login *plogi; 2051 struct ibmvfc_target *tgt; 2052 struct ibmvfc_event *evt; 2053 union ibmvfc_iu rsp_iu; 2054 unsigned long flags; 2055 int rc = 0, issue_login = 1; 2056 2057 ENTER; 2058 spin_lock_irqsave(vhost->host->host_lock, flags); 2059 list_for_each_entry(tgt, &vhost->targets, queue) { 2060 if (tgt->scsi_id == port_id) { 2061 issue_login = 0; 2062 break; 2063 } 2064 } 2065 2066 if (!issue_login) 2067 goto unlock_out; 2068 if (unlikely((rc = ibmvfc_host_chkready(vhost)))) 2069 goto unlock_out; 2070 2071 evt = ibmvfc_get_event(&vhost->crq); 2072 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2073 plogi = &evt->iu.plogi; 2074 memset(plogi, 0, sizeof(*plogi)); 2075 plogi->common.version = cpu_to_be32(1); 2076 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN); 2077 plogi->common.length = cpu_to_be16(sizeof(*plogi)); 2078 plogi->scsi_id = cpu_to_be64(port_id); 2079 evt->sync_iu = &rsp_iu; 2080 init_completion(&evt->comp); 2081 2082 rc = ibmvfc_send_event(evt, vhost, default_timeout); 2083 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2084 2085 if (rc) 2086 return -EIO; 2087 2088 wait_for_completion(&evt->comp); 2089 2090 if (rsp_iu.plogi.common.status) 2091 rc = -EIO; 2092 2093 spin_lock_irqsave(vhost->host->host_lock, flags); 2094 ibmvfc_free_event(evt); 2095 unlock_out: 2096 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2097 LEAVE; 2098 return rc; 2099 } 2100 2101 /** 2102 * ibmvfc_bsg_request - Handle a BSG request 2103 * @job: struct bsg_job to be executed 2104 * 2105 * Returns: 2106 * 0 on success / other on failure 2107 **/ 2108 static int ibmvfc_bsg_request(struct bsg_job *job) 2109 { 2110 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job)); 2111 struct fc_rport *rport = fc_bsg_to_rport(job); 2112 struct ibmvfc_passthru_mad *mad; 2113 struct ibmvfc_event *evt; 2114 union ibmvfc_iu rsp_iu; 2115 unsigned long flags, port_id = -1; 2116 struct fc_bsg_request *bsg_request = job->request; 2117 struct fc_bsg_reply *bsg_reply = job->reply; 2118 unsigned int code = bsg_request->msgcode; 2119 int rc = 0, req_seg, rsp_seg, issue_login = 0; 2120 u32 fc_flags, rsp_len; 2121 2122 ENTER; 2123 bsg_reply->reply_payload_rcv_len = 0; 2124 if (rport) 2125 port_id = rport->port_id; 2126 2127 switch (code) { 2128 case FC_BSG_HST_ELS_NOLOGIN: 2129 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) | 2130 (bsg_request->rqst_data.h_els.port_id[1] << 8) | 2131 bsg_request->rqst_data.h_els.port_id[2]; 2132 fallthrough; 2133 case FC_BSG_RPT_ELS: 2134 fc_flags = IBMVFC_FC_ELS; 2135 break; 2136 case FC_BSG_HST_CT: 2137 issue_login = 1; 2138 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) | 2139 (bsg_request->rqst_data.h_ct.port_id[1] << 8) | 2140 bsg_request->rqst_data.h_ct.port_id[2]; 2141 fallthrough; 2142 case FC_BSG_RPT_CT: 2143 fc_flags = IBMVFC_FC_CT_IU; 2144 break; 2145 default: 2146 return -ENOTSUPP; 2147 } 2148 2149 if (port_id == -1) 2150 return -EINVAL; 2151 if (!mutex_trylock(&vhost->passthru_mutex)) 2152 return -EBUSY; 2153 2154 job->dd_data = (void *)port_id; 2155 req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list, 2156 job->request_payload.sg_cnt, DMA_TO_DEVICE); 2157 2158 if (!req_seg) { 2159 mutex_unlock(&vhost->passthru_mutex); 2160 return -ENOMEM; 2161 } 2162 2163 rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list, 2164 job->reply_payload.sg_cnt, DMA_FROM_DEVICE); 2165 2166 if (!rsp_seg) { 2167 dma_unmap_sg(vhost->dev, job->request_payload.sg_list, 2168 job->request_payload.sg_cnt, DMA_TO_DEVICE); 2169 mutex_unlock(&vhost->passthru_mutex); 2170 return -ENOMEM; 2171 } 2172 2173 if (req_seg > 1 || rsp_seg > 1) { 2174 rc = -EINVAL; 2175 goto out; 2176 } 2177 2178 if (issue_login) 2179 rc = ibmvfc_bsg_plogi(vhost, port_id); 2180 2181 spin_lock_irqsave(vhost->host->host_lock, flags); 2182 2183 if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) || 2184 unlikely((rc = ibmvfc_host_chkready(vhost)))) { 2185 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2186 goto out; 2187 } 2188 2189 evt = ibmvfc_get_event(&vhost->crq); 2190 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2191 mad = &evt->iu.passthru; 2192 2193 memset(mad, 0, sizeof(*mad)); 2194 mad->common.version = cpu_to_be32(1); 2195 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU); 2196 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu)); 2197 2198 mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + 2199 offsetof(struct ibmvfc_passthru_mad, iu)); 2200 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu)); 2201 2202 mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len); 2203 mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len); 2204 mad->iu.flags = cpu_to_be32(fc_flags); 2205 mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY); 2206 2207 mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list)); 2208 mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list)); 2209 mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list)); 2210 mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list)); 2211 mad->iu.scsi_id = cpu_to_be64(port_id); 2212 mad->iu.tag = cpu_to_be64((u64)evt); 2213 rsp_len = be32_to_cpu(mad->iu.rsp.len); 2214 2215 evt->sync_iu = &rsp_iu; 2216 init_completion(&evt->comp); 2217 rc = ibmvfc_send_event(evt, vhost, 0); 2218 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2219 2220 if (rc) { 2221 rc = -EIO; 2222 goto out; 2223 } 2224 2225 wait_for_completion(&evt->comp); 2226 2227 if (rsp_iu.passthru.common.status) 2228 rc = -EIO; 2229 else 2230 bsg_reply->reply_payload_rcv_len = rsp_len; 2231 2232 spin_lock_irqsave(vhost->host->host_lock, flags); 2233 ibmvfc_free_event(evt); 2234 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2235 bsg_reply->result = rc; 2236 bsg_job_done(job, bsg_reply->result, 2237 bsg_reply->reply_payload_rcv_len); 2238 rc = 0; 2239 out: 2240 dma_unmap_sg(vhost->dev, job->request_payload.sg_list, 2241 job->request_payload.sg_cnt, DMA_TO_DEVICE); 2242 dma_unmap_sg(vhost->dev, job->reply_payload.sg_list, 2243 job->reply_payload.sg_cnt, DMA_FROM_DEVICE); 2244 mutex_unlock(&vhost->passthru_mutex); 2245 LEAVE; 2246 return rc; 2247 } 2248 2249 /** 2250 * ibmvfc_reset_device - Reset the device with the specified reset type 2251 * @sdev: scsi device to reset 2252 * @type: reset type 2253 * @desc: reset type description for log messages 2254 * 2255 * Returns: 2256 * 0 on success / other on failure 2257 **/ 2258 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc) 2259 { 2260 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2261 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2262 struct ibmvfc_cmd *tmf; 2263 struct ibmvfc_event *evt = NULL; 2264 union ibmvfc_iu rsp_iu; 2265 struct ibmvfc_fcp_cmd_iu *iu; 2266 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd); 2267 int rsp_rc = -EBUSY; 2268 unsigned long flags; 2269 int rsp_code = 0; 2270 2271 spin_lock_irqsave(vhost->host->host_lock, flags); 2272 if (vhost->state == IBMVFC_ACTIVE) { 2273 if (vhost->using_channels) 2274 evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]); 2275 else 2276 evt = ibmvfc_get_event(&vhost->crq); 2277 2278 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); 2279 tmf = ibmvfc_init_vfc_cmd(evt, sdev); 2280 iu = ibmvfc_get_fcp_iu(vhost, tmf); 2281 2282 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF)); 2283 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 2284 tmf->target_wwpn = cpu_to_be64(rport->port_name); 2285 iu->tmf_flags = type; 2286 evt->sync_iu = &rsp_iu; 2287 2288 init_completion(&evt->comp); 2289 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2290 } 2291 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2292 2293 if (rsp_rc != 0) { 2294 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n", 2295 desc, rsp_rc); 2296 return -EIO; 2297 } 2298 2299 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc); 2300 wait_for_completion(&evt->comp); 2301 2302 if (rsp_iu.cmd.status) 2303 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd); 2304 2305 if (rsp_code) { 2306 if (fc_rsp->flags & FCP_RSP_LEN_VALID) 2307 rsp_code = fc_rsp->data.info.rsp_code; 2308 2309 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) " 2310 "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc, 2311 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)), 2312 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code, 2313 fc_rsp->scsi_status); 2314 rsp_rc = -EIO; 2315 } else 2316 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc); 2317 2318 spin_lock_irqsave(vhost->host->host_lock, flags); 2319 ibmvfc_free_event(evt); 2320 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2321 return rsp_rc; 2322 } 2323 2324 /** 2325 * ibmvfc_match_rport - Match function for specified remote port 2326 * @evt: ibmvfc event struct 2327 * @device: device to match (rport) 2328 * 2329 * Returns: 2330 * 1 if event matches rport / 0 if event does not match rport 2331 **/ 2332 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport) 2333 { 2334 struct fc_rport *cmd_rport; 2335 2336 if (evt->cmnd) { 2337 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device)); 2338 if (cmd_rport == rport) 2339 return 1; 2340 } 2341 return 0; 2342 } 2343 2344 /** 2345 * ibmvfc_match_target - Match function for specified target 2346 * @evt: ibmvfc event struct 2347 * @device: device to match (starget) 2348 * 2349 * Returns: 2350 * 1 if event matches starget / 0 if event does not match starget 2351 **/ 2352 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device) 2353 { 2354 if (evt->cmnd && scsi_target(evt->cmnd->device) == device) 2355 return 1; 2356 return 0; 2357 } 2358 2359 /** 2360 * ibmvfc_match_lun - Match function for specified LUN 2361 * @evt: ibmvfc event struct 2362 * @device: device to match (sdev) 2363 * 2364 * Returns: 2365 * 1 if event matches sdev / 0 if event does not match sdev 2366 **/ 2367 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device) 2368 { 2369 if (evt->cmnd && evt->cmnd->device == device) 2370 return 1; 2371 return 0; 2372 } 2373 2374 /** 2375 * ibmvfc_event_is_free - Check if event is free or not 2376 * @evt: ibmvfc event struct 2377 * 2378 * Returns: 2379 * true / false 2380 **/ 2381 static bool ibmvfc_event_is_free(struct ibmvfc_event *evt) 2382 { 2383 struct ibmvfc_event *loop_evt; 2384 2385 list_for_each_entry(loop_evt, &evt->queue->free, queue_list) 2386 if (loop_evt == evt) 2387 return true; 2388 2389 return false; 2390 } 2391 2392 /** 2393 * ibmvfc_wait_for_ops - Wait for ops to complete 2394 * @vhost: ibmvfc host struct 2395 * @device: device to match (starget or sdev) 2396 * @match: match function 2397 * 2398 * Returns: 2399 * SUCCESS / FAILED 2400 **/ 2401 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device, 2402 int (*match) (struct ibmvfc_event *, void *)) 2403 { 2404 struct ibmvfc_event *evt; 2405 DECLARE_COMPLETION_ONSTACK(comp); 2406 int wait, i, q_index, q_size; 2407 unsigned long flags; 2408 signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ; 2409 struct ibmvfc_queue *queues; 2410 2411 ENTER; 2412 if (vhost->mq_enabled && vhost->using_channels) { 2413 queues = vhost->scsi_scrqs.scrqs; 2414 q_size = vhost->scsi_scrqs.active_queues; 2415 } else { 2416 queues = &vhost->crq; 2417 q_size = 1; 2418 } 2419 2420 do { 2421 wait = 0; 2422 spin_lock_irqsave(vhost->host->host_lock, flags); 2423 for (q_index = 0; q_index < q_size; q_index++) { 2424 spin_lock(&queues[q_index].l_lock); 2425 for (i = 0; i < queues[q_index].evt_pool.size; i++) { 2426 evt = &queues[q_index].evt_pool.events[i]; 2427 if (!ibmvfc_event_is_free(evt)) { 2428 if (match(evt, device)) { 2429 evt->eh_comp = ∁ 2430 wait++; 2431 } 2432 } 2433 } 2434 spin_unlock(&queues[q_index].l_lock); 2435 } 2436 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2437 2438 if (wait) { 2439 timeout = wait_for_completion_timeout(&comp, timeout); 2440 2441 if (!timeout) { 2442 wait = 0; 2443 spin_lock_irqsave(vhost->host->host_lock, flags); 2444 for (q_index = 0; q_index < q_size; q_index++) { 2445 spin_lock(&queues[q_index].l_lock); 2446 for (i = 0; i < queues[q_index].evt_pool.size; i++) { 2447 evt = &queues[q_index].evt_pool.events[i]; 2448 if (!ibmvfc_event_is_free(evt)) { 2449 if (match(evt, device)) { 2450 evt->eh_comp = NULL; 2451 wait++; 2452 } 2453 } 2454 } 2455 spin_unlock(&queues[q_index].l_lock); 2456 } 2457 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2458 if (wait) 2459 dev_err(vhost->dev, "Timed out waiting for aborted commands\n"); 2460 LEAVE; 2461 return wait ? FAILED : SUCCESS; 2462 } 2463 } 2464 } while (wait); 2465 2466 LEAVE; 2467 return SUCCESS; 2468 } 2469 2470 static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue, 2471 struct scsi_device *sdev, 2472 int type) 2473 { 2474 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2475 struct scsi_target *starget = scsi_target(sdev); 2476 struct fc_rport *rport = starget_to_rport(starget); 2477 struct ibmvfc_event *evt; 2478 struct ibmvfc_tmf *tmf; 2479 2480 evt = ibmvfc_get_event(queue); 2481 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2482 2483 tmf = &evt->iu.tmf; 2484 memset(tmf, 0, sizeof(*tmf)); 2485 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 2486 tmf->common.version = cpu_to_be32(2); 2487 tmf->target_wwpn = cpu_to_be64(rport->port_name); 2488 } else { 2489 tmf->common.version = cpu_to_be32(1); 2490 } 2491 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); 2492 tmf->common.length = cpu_to_be16(sizeof(*tmf)); 2493 tmf->scsi_id = cpu_to_be64(rport->port_id); 2494 int_to_scsilun(sdev->lun, &tmf->lun); 2495 if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS)) 2496 type &= ~IBMVFC_TMF_SUPPRESS_ABTS; 2497 if (vhost->state == IBMVFC_ACTIVE) 2498 tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID)); 2499 else 2500 tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID)); 2501 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata); 2502 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata); 2503 2504 init_completion(&evt->comp); 2505 2506 return evt; 2507 } 2508 2509 static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type) 2510 { 2511 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2512 struct ibmvfc_event *evt, *found_evt, *temp; 2513 struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs; 2514 unsigned long flags; 2515 int num_hwq, i; 2516 int fail = 0; 2517 LIST_HEAD(cancelq); 2518 u16 status; 2519 2520 ENTER; 2521 spin_lock_irqsave(vhost->host->host_lock, flags); 2522 num_hwq = vhost->scsi_scrqs.active_queues; 2523 for (i = 0; i < num_hwq; i++) { 2524 spin_lock(queues[i].q_lock); 2525 spin_lock(&queues[i].l_lock); 2526 found_evt = NULL; 2527 list_for_each_entry(evt, &queues[i].sent, queue_list) { 2528 if (evt->cmnd && evt->cmnd->device == sdev) { 2529 found_evt = evt; 2530 break; 2531 } 2532 } 2533 spin_unlock(&queues[i].l_lock); 2534 2535 if (found_evt && vhost->logged_in) { 2536 evt = ibmvfc_init_tmf(&queues[i], sdev, type); 2537 evt->sync_iu = &queues[i].cancel_rsp; 2538 ibmvfc_send_event(evt, vhost, default_timeout); 2539 list_add_tail(&evt->cancel, &cancelq); 2540 } 2541 2542 spin_unlock(queues[i].q_lock); 2543 } 2544 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2545 2546 if (list_empty(&cancelq)) { 2547 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2548 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n"); 2549 return 0; 2550 } 2551 2552 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n"); 2553 2554 list_for_each_entry_safe(evt, temp, &cancelq, cancel) { 2555 wait_for_completion(&evt->comp); 2556 status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status); 2557 list_del(&evt->cancel); 2558 ibmvfc_free_event(evt); 2559 2560 if (status != IBMVFC_MAD_SUCCESS) { 2561 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status); 2562 switch (status) { 2563 case IBMVFC_MAD_DRIVER_FAILED: 2564 case IBMVFC_MAD_CRQ_ERROR: 2565 /* Host adapter most likely going through reset, return success to 2566 * the caller will wait for the command being cancelled to get returned 2567 */ 2568 break; 2569 default: 2570 fail = 1; 2571 break; 2572 } 2573 } 2574 } 2575 2576 if (fail) 2577 return -EIO; 2578 2579 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n"); 2580 LEAVE; 2581 return 0; 2582 } 2583 2584 static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type) 2585 { 2586 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2587 struct ibmvfc_event *evt, *found_evt; 2588 union ibmvfc_iu rsp; 2589 int rsp_rc = -EBUSY; 2590 unsigned long flags; 2591 u16 status; 2592 2593 ENTER; 2594 found_evt = NULL; 2595 spin_lock_irqsave(vhost->host->host_lock, flags); 2596 spin_lock(&vhost->crq.l_lock); 2597 list_for_each_entry(evt, &vhost->crq.sent, queue_list) { 2598 if (evt->cmnd && evt->cmnd->device == sdev) { 2599 found_evt = evt; 2600 break; 2601 } 2602 } 2603 spin_unlock(&vhost->crq.l_lock); 2604 2605 if (!found_evt) { 2606 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2607 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n"); 2608 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2609 return 0; 2610 } 2611 2612 if (vhost->logged_in) { 2613 evt = ibmvfc_init_tmf(&vhost->crq, sdev, type); 2614 evt->sync_iu = &rsp; 2615 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2616 } 2617 2618 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2619 2620 if (rsp_rc != 0) { 2621 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc); 2622 /* If failure is received, the host adapter is most likely going 2623 through reset, return success so the caller will wait for the command 2624 being cancelled to get returned */ 2625 return 0; 2626 } 2627 2628 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n"); 2629 2630 wait_for_completion(&evt->comp); 2631 status = be16_to_cpu(rsp.mad_common.status); 2632 spin_lock_irqsave(vhost->host->host_lock, flags); 2633 ibmvfc_free_event(evt); 2634 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2635 2636 if (status != IBMVFC_MAD_SUCCESS) { 2637 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status); 2638 switch (status) { 2639 case IBMVFC_MAD_DRIVER_FAILED: 2640 case IBMVFC_MAD_CRQ_ERROR: 2641 /* Host adapter most likely going through reset, return success to 2642 the caller will wait for the command being cancelled to get returned */ 2643 return 0; 2644 default: 2645 return -EIO; 2646 }; 2647 } 2648 2649 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n"); 2650 return 0; 2651 } 2652 2653 /** 2654 * ibmvfc_cancel_all - Cancel all outstanding commands to the device 2655 * @sdev: scsi device to cancel commands 2656 * @type: type of error recovery being performed 2657 * 2658 * This sends a cancel to the VIOS for the specified device. This does 2659 * NOT send any abort to the actual device. That must be done separately. 2660 * 2661 * Returns: 2662 * 0 on success / other on failure 2663 **/ 2664 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type) 2665 { 2666 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2667 2668 if (vhost->mq_enabled && vhost->using_channels) 2669 return ibmvfc_cancel_all_mq(sdev, type); 2670 else 2671 return ibmvfc_cancel_all_sq(sdev, type); 2672 } 2673 2674 /** 2675 * ibmvfc_match_key - Match function for specified cancel key 2676 * @evt: ibmvfc event struct 2677 * @key: cancel key to match 2678 * 2679 * Returns: 2680 * 1 if event matches key / 0 if event does not match key 2681 **/ 2682 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key) 2683 { 2684 unsigned long cancel_key = (unsigned long)key; 2685 2686 if (evt->crq.format == IBMVFC_CMD_FORMAT && 2687 be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key) 2688 return 1; 2689 return 0; 2690 } 2691 2692 /** 2693 * ibmvfc_match_evt - Match function for specified event 2694 * @evt: ibmvfc event struct 2695 * @match: event to match 2696 * 2697 * Returns: 2698 * 1 if event matches key / 0 if event does not match key 2699 **/ 2700 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match) 2701 { 2702 if (evt == match) 2703 return 1; 2704 return 0; 2705 } 2706 2707 /** 2708 * ibmvfc_abort_task_set - Abort outstanding commands to the device 2709 * @sdev: scsi device to abort commands 2710 * 2711 * This sends an Abort Task Set to the VIOS for the specified device. This does 2712 * NOT send any cancel to the VIOS. That must be done separately. 2713 * 2714 * Returns: 2715 * 0 on success / other on failure 2716 **/ 2717 static int ibmvfc_abort_task_set(struct scsi_device *sdev) 2718 { 2719 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2720 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2721 struct ibmvfc_cmd *tmf; 2722 struct ibmvfc_event *evt, *found_evt; 2723 union ibmvfc_iu rsp_iu; 2724 struct ibmvfc_fcp_cmd_iu *iu; 2725 struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd); 2726 int rc, rsp_rc = -EBUSY; 2727 unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT; 2728 int rsp_code = 0; 2729 2730 found_evt = NULL; 2731 spin_lock_irqsave(vhost->host->host_lock, flags); 2732 spin_lock(&vhost->crq.l_lock); 2733 list_for_each_entry(evt, &vhost->crq.sent, queue_list) { 2734 if (evt->cmnd && evt->cmnd->device == sdev) { 2735 found_evt = evt; 2736 break; 2737 } 2738 } 2739 spin_unlock(&vhost->crq.l_lock); 2740 2741 if (!found_evt) { 2742 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2743 sdev_printk(KERN_INFO, sdev, "No events found to abort\n"); 2744 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2745 return 0; 2746 } 2747 2748 if (vhost->state == IBMVFC_ACTIVE) { 2749 evt = ibmvfc_get_event(&vhost->crq); 2750 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); 2751 tmf = ibmvfc_init_vfc_cmd(evt, sdev); 2752 iu = ibmvfc_get_fcp_iu(vhost, tmf); 2753 2754 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) 2755 tmf->target_wwpn = cpu_to_be64(rport->port_name); 2756 iu->tmf_flags = IBMVFC_ABORT_TASK_SET; 2757 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF)); 2758 evt->sync_iu = &rsp_iu; 2759 2760 tmf->correlation = cpu_to_be64((u64)evt); 2761 2762 init_completion(&evt->comp); 2763 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2764 } 2765 2766 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2767 2768 if (rsp_rc != 0) { 2769 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc); 2770 return -EIO; 2771 } 2772 2773 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n"); 2774 timeout = wait_for_completion_timeout(&evt->comp, timeout); 2775 2776 if (!timeout) { 2777 rc = ibmvfc_cancel_all(sdev, 0); 2778 if (!rc) { 2779 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); 2780 if (rc == SUCCESS) 2781 rc = 0; 2782 } 2783 2784 if (rc) { 2785 sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n"); 2786 ibmvfc_reset_host(vhost); 2787 rsp_rc = -EIO; 2788 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); 2789 2790 if (rc == SUCCESS) 2791 rsp_rc = 0; 2792 2793 rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt); 2794 if (rc != SUCCESS) { 2795 spin_lock_irqsave(vhost->host->host_lock, flags); 2796 ibmvfc_hard_reset_host(vhost); 2797 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2798 rsp_rc = 0; 2799 } 2800 2801 goto out; 2802 } 2803 } 2804 2805 if (rsp_iu.cmd.status) 2806 rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd); 2807 2808 if (rsp_code) { 2809 if (fc_rsp->flags & FCP_RSP_LEN_VALID) 2810 rsp_code = fc_rsp->data.info.rsp_code; 2811 2812 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) " 2813 "flags: %x fcp_rsp: %x, scsi_status: %x\n", 2814 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)), 2815 be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code, 2816 fc_rsp->scsi_status); 2817 rsp_rc = -EIO; 2818 } else 2819 sdev_printk(KERN_INFO, sdev, "Abort successful\n"); 2820 2821 out: 2822 spin_lock_irqsave(vhost->host->host_lock, flags); 2823 ibmvfc_free_event(evt); 2824 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2825 return rsp_rc; 2826 } 2827 2828 /** 2829 * ibmvfc_eh_abort_handler - Abort a command 2830 * @cmd: scsi command to abort 2831 * 2832 * Returns: 2833 * SUCCESS / FAST_IO_FAIL / FAILED 2834 **/ 2835 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd) 2836 { 2837 struct scsi_device *sdev = cmd->device; 2838 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2839 int cancel_rc, block_rc; 2840 int rc = FAILED; 2841 2842 ENTER; 2843 block_rc = fc_block_scsi_eh(cmd); 2844 ibmvfc_wait_while_resetting(vhost); 2845 if (block_rc != FAST_IO_FAIL) { 2846 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET); 2847 ibmvfc_abort_task_set(sdev); 2848 } else 2849 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2850 2851 if (!cancel_rc) 2852 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); 2853 2854 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2855 rc = FAST_IO_FAIL; 2856 2857 LEAVE; 2858 return rc; 2859 } 2860 2861 /** 2862 * ibmvfc_eh_device_reset_handler - Reset a single LUN 2863 * @cmd: scsi command struct 2864 * 2865 * Returns: 2866 * SUCCESS / FAST_IO_FAIL / FAILED 2867 **/ 2868 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd) 2869 { 2870 struct scsi_device *sdev = cmd->device; 2871 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2872 int cancel_rc, block_rc, reset_rc = 0; 2873 int rc = FAILED; 2874 2875 ENTER; 2876 block_rc = fc_block_scsi_eh(cmd); 2877 ibmvfc_wait_while_resetting(vhost); 2878 if (block_rc != FAST_IO_FAIL) { 2879 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET); 2880 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN"); 2881 } else 2882 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2883 2884 if (!cancel_rc && !reset_rc) 2885 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); 2886 2887 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2888 rc = FAST_IO_FAIL; 2889 2890 LEAVE; 2891 return rc; 2892 } 2893 2894 /** 2895 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function 2896 * @sdev: scsi device struct 2897 * @data: return code 2898 * 2899 **/ 2900 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data) 2901 { 2902 unsigned long *rc = data; 2903 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2904 } 2905 2906 /** 2907 * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function 2908 * @sdev: scsi device struct 2909 * @data: return code 2910 * 2911 **/ 2912 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data) 2913 { 2914 unsigned long *rc = data; 2915 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET); 2916 } 2917 2918 /** 2919 * ibmvfc_eh_target_reset_handler - Reset the target 2920 * @cmd: scsi command struct 2921 * 2922 * Returns: 2923 * SUCCESS / FAST_IO_FAIL / FAILED 2924 **/ 2925 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd) 2926 { 2927 struct scsi_device *sdev = cmd->device; 2928 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2929 struct scsi_target *starget = scsi_target(sdev); 2930 int block_rc; 2931 int reset_rc = 0; 2932 int rc = FAILED; 2933 unsigned long cancel_rc = 0; 2934 2935 ENTER; 2936 block_rc = fc_block_scsi_eh(cmd); 2937 ibmvfc_wait_while_resetting(vhost); 2938 if (block_rc != FAST_IO_FAIL) { 2939 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset); 2940 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target"); 2941 } else 2942 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset); 2943 2944 if (!cancel_rc && !reset_rc) 2945 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target); 2946 2947 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2948 rc = FAST_IO_FAIL; 2949 2950 LEAVE; 2951 return rc; 2952 } 2953 2954 /** 2955 * ibmvfc_eh_host_reset_handler - Reset the connection to the server 2956 * @cmd: struct scsi_cmnd having problems 2957 * 2958 **/ 2959 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd) 2960 { 2961 int rc; 2962 struct ibmvfc_host *vhost = shost_priv(cmd->device->host); 2963 2964 dev_err(vhost->dev, "Resetting connection due to error recovery\n"); 2965 rc = ibmvfc_issue_fc_host_lip(vhost->host); 2966 2967 return rc ? FAILED : SUCCESS; 2968 } 2969 2970 /** 2971 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport. 2972 * @rport: rport struct 2973 * 2974 * Return value: 2975 * none 2976 **/ 2977 static void ibmvfc_terminate_rport_io(struct fc_rport *rport) 2978 { 2979 struct Scsi_Host *shost = rport_to_shost(rport); 2980 struct ibmvfc_host *vhost = shost_priv(shost); 2981 struct fc_rport *dev_rport; 2982 struct scsi_device *sdev; 2983 struct ibmvfc_target *tgt; 2984 unsigned long rc, flags; 2985 unsigned int found; 2986 2987 ENTER; 2988 shost_for_each_device(sdev, shost) { 2989 dev_rport = starget_to_rport(scsi_target(sdev)); 2990 if (dev_rport != rport) 2991 continue; 2992 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2993 } 2994 2995 rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport); 2996 2997 if (rc == FAILED) 2998 ibmvfc_issue_fc_host_lip(shost); 2999 3000 spin_lock_irqsave(shost->host_lock, flags); 3001 found = 0; 3002 list_for_each_entry(tgt, &vhost->targets, queue) { 3003 if (tgt->scsi_id == rport->port_id) { 3004 found++; 3005 break; 3006 } 3007 } 3008 3009 if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) { 3010 /* 3011 * If we get here, that means we previously attempted to send 3012 * an implicit logout to the target but it failed, most likely 3013 * due to I/O being pending, so we need to send it again 3014 */ 3015 ibmvfc_del_tgt(tgt); 3016 ibmvfc_reinit_host(vhost); 3017 } 3018 3019 spin_unlock_irqrestore(shost->host_lock, flags); 3020 LEAVE; 3021 } 3022 3023 static const struct ibmvfc_async_desc ae_desc [] = { 3024 { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3025 { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3026 { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3027 { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3028 { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 3029 { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL }, 3030 { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL }, 3031 { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL }, 3032 { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL }, 3033 { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL }, 3034 { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL }, 3035 { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL }, 3036 { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL }, 3037 }; 3038 3039 static const struct ibmvfc_async_desc unknown_ae = { 3040 "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL 3041 }; 3042 3043 /** 3044 * ibmvfc_get_ae_desc - Get text description for async event 3045 * @ae: async event 3046 * 3047 **/ 3048 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae) 3049 { 3050 int i; 3051 3052 for (i = 0; i < ARRAY_SIZE(ae_desc); i++) 3053 if (ae_desc[i].ae == ae) 3054 return &ae_desc[i]; 3055 3056 return &unknown_ae; 3057 } 3058 3059 static const struct { 3060 enum ibmvfc_ae_link_state state; 3061 const char *desc; 3062 } link_desc [] = { 3063 { IBMVFC_AE_LS_LINK_UP, " link up" }, 3064 { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" }, 3065 { IBMVFC_AE_LS_LINK_DOWN, " link down" }, 3066 { IBMVFC_AE_LS_LINK_DEAD, " link dead" }, 3067 }; 3068 3069 /** 3070 * ibmvfc_get_link_state - Get text description for link state 3071 * @state: link state 3072 * 3073 **/ 3074 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state) 3075 { 3076 int i; 3077 3078 for (i = 0; i < ARRAY_SIZE(link_desc); i++) 3079 if (link_desc[i].state == state) 3080 return link_desc[i].desc; 3081 3082 return ""; 3083 } 3084 3085 /** 3086 * ibmvfc_handle_async - Handle an async event from the adapter 3087 * @crq: crq to process 3088 * @vhost: ibmvfc host struct 3089 * 3090 **/ 3091 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq, 3092 struct ibmvfc_host *vhost) 3093 { 3094 const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event)); 3095 struct ibmvfc_target *tgt; 3096 3097 ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx," 3098 " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id), 3099 be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name), 3100 ibmvfc_get_link_state(crq->link_state)); 3101 3102 switch (be64_to_cpu(crq->event)) { 3103 case IBMVFC_AE_RESUME: 3104 switch (crq->link_state) { 3105 case IBMVFC_AE_LS_LINK_DOWN: 3106 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3107 break; 3108 case IBMVFC_AE_LS_LINK_DEAD: 3109 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3110 break; 3111 case IBMVFC_AE_LS_LINK_UP: 3112 case IBMVFC_AE_LS_LINK_BOUNCED: 3113 default: 3114 vhost->events_to_log |= IBMVFC_AE_LINKUP; 3115 vhost->delay_init = 1; 3116 __ibmvfc_reset_host(vhost); 3117 break; 3118 } 3119 3120 break; 3121 case IBMVFC_AE_LINK_UP: 3122 vhost->events_to_log |= IBMVFC_AE_LINKUP; 3123 vhost->delay_init = 1; 3124 __ibmvfc_reset_host(vhost); 3125 break; 3126 case IBMVFC_AE_SCN_FABRIC: 3127 case IBMVFC_AE_SCN_DOMAIN: 3128 vhost->events_to_log |= IBMVFC_AE_RSCN; 3129 if (vhost->state < IBMVFC_HALTED) { 3130 vhost->delay_init = 1; 3131 __ibmvfc_reset_host(vhost); 3132 } 3133 break; 3134 case IBMVFC_AE_SCN_NPORT: 3135 case IBMVFC_AE_SCN_GROUP: 3136 vhost->events_to_log |= IBMVFC_AE_RSCN; 3137 ibmvfc_reinit_host(vhost); 3138 break; 3139 case IBMVFC_AE_ELS_LOGO: 3140 case IBMVFC_AE_ELS_PRLO: 3141 case IBMVFC_AE_ELS_PLOGI: 3142 list_for_each_entry(tgt, &vhost->targets, queue) { 3143 if (!crq->scsi_id && !crq->wwpn && !crq->node_name) 3144 break; 3145 if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id) 3146 continue; 3147 if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn) 3148 continue; 3149 if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name) 3150 continue; 3151 if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO) 3152 tgt->logo_rcvd = 1; 3153 if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) { 3154 ibmvfc_del_tgt(tgt); 3155 ibmvfc_reinit_host(vhost); 3156 } 3157 } 3158 break; 3159 case IBMVFC_AE_LINK_DOWN: 3160 case IBMVFC_AE_ADAPTER_FAILED: 3161 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3162 break; 3163 case IBMVFC_AE_LINK_DEAD: 3164 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3165 break; 3166 case IBMVFC_AE_HALT: 3167 ibmvfc_link_down(vhost, IBMVFC_HALTED); 3168 break; 3169 default: 3170 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event); 3171 break; 3172 } 3173 } 3174 3175 /** 3176 * ibmvfc_handle_crq - Handles and frees received events in the CRQ 3177 * @crq: Command/Response queue 3178 * @vhost: ibmvfc host struct 3179 * 3180 **/ 3181 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost, 3182 struct list_head *evt_doneq) 3183 { 3184 long rc; 3185 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba); 3186 3187 switch (crq->valid) { 3188 case IBMVFC_CRQ_INIT_RSP: 3189 switch (crq->format) { 3190 case IBMVFC_CRQ_INIT: 3191 dev_info(vhost->dev, "Partner initialized\n"); 3192 /* Send back a response */ 3193 rc = ibmvfc_send_crq_init_complete(vhost); 3194 if (rc == 0) 3195 ibmvfc_init_host(vhost); 3196 else 3197 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc); 3198 break; 3199 case IBMVFC_CRQ_INIT_COMPLETE: 3200 dev_info(vhost->dev, "Partner initialization complete\n"); 3201 ibmvfc_init_host(vhost); 3202 break; 3203 default: 3204 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format); 3205 } 3206 return; 3207 case IBMVFC_CRQ_XPORT_EVENT: 3208 vhost->state = IBMVFC_NO_CRQ; 3209 vhost->logged_in = 0; 3210 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 3211 if (crq->format == IBMVFC_PARTITION_MIGRATED) { 3212 /* We need to re-setup the interpartition connection */ 3213 dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n"); 3214 vhost->client_migrated = 1; 3215 ibmvfc_purge_requests(vhost, DID_REQUEUE); 3216 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3217 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE); 3218 } else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) { 3219 dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format); 3220 ibmvfc_purge_requests(vhost, DID_ERROR); 3221 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 3222 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); 3223 } else { 3224 dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format); 3225 } 3226 return; 3227 case IBMVFC_CRQ_CMD_RSP: 3228 break; 3229 default: 3230 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid); 3231 return; 3232 } 3233 3234 if (crq->format == IBMVFC_ASYNC_EVENT) 3235 return; 3236 3237 /* The only kind of payload CRQs we should get are responses to 3238 * things we send. Make sure this response is to something we 3239 * actually sent 3240 */ 3241 if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) { 3242 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n", 3243 crq->ioba); 3244 return; 3245 } 3246 3247 if (unlikely(atomic_read(&evt->free))) { 3248 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n", 3249 crq->ioba); 3250 return; 3251 } 3252 3253 spin_lock(&evt->queue->l_lock); 3254 list_move_tail(&evt->queue_list, evt_doneq); 3255 spin_unlock(&evt->queue->l_lock); 3256 } 3257 3258 /** 3259 * ibmvfc_scan_finished - Check if the device scan is done. 3260 * @shost: scsi host struct 3261 * @time: current elapsed time 3262 * 3263 * Returns: 3264 * 0 if scan is not done / 1 if scan is done 3265 **/ 3266 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time) 3267 { 3268 unsigned long flags; 3269 struct ibmvfc_host *vhost = shost_priv(shost); 3270 int done = 0; 3271 3272 spin_lock_irqsave(shost->host_lock, flags); 3273 if (time >= (init_timeout * HZ)) { 3274 dev_info(vhost->dev, "Scan taking longer than %d seconds, " 3275 "continuing initialization\n", init_timeout); 3276 done = 1; 3277 } 3278 3279 if (vhost->scan_complete) 3280 done = 1; 3281 spin_unlock_irqrestore(shost->host_lock, flags); 3282 return done; 3283 } 3284 3285 /** 3286 * ibmvfc_slave_alloc - Setup the device's task set value 3287 * @sdev: struct scsi_device device to configure 3288 * 3289 * Set the device's task set value so that error handling works as 3290 * expected. 3291 * 3292 * Returns: 3293 * 0 on success / -ENXIO if device does not exist 3294 **/ 3295 static int ibmvfc_slave_alloc(struct scsi_device *sdev) 3296 { 3297 struct Scsi_Host *shost = sdev->host; 3298 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 3299 struct ibmvfc_host *vhost = shost_priv(shost); 3300 unsigned long flags = 0; 3301 3302 if (!rport || fc_remote_port_chkready(rport)) 3303 return -ENXIO; 3304 3305 spin_lock_irqsave(shost->host_lock, flags); 3306 sdev->hostdata = (void *)(unsigned long)vhost->task_set++; 3307 spin_unlock_irqrestore(shost->host_lock, flags); 3308 return 0; 3309 } 3310 3311 /** 3312 * ibmvfc_target_alloc - Setup the target's task set value 3313 * @starget: struct scsi_target 3314 * 3315 * Set the target's task set value so that error handling works as 3316 * expected. 3317 * 3318 * Returns: 3319 * 0 on success / -ENXIO if device does not exist 3320 **/ 3321 static int ibmvfc_target_alloc(struct scsi_target *starget) 3322 { 3323 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 3324 struct ibmvfc_host *vhost = shost_priv(shost); 3325 unsigned long flags = 0; 3326 3327 spin_lock_irqsave(shost->host_lock, flags); 3328 starget->hostdata = (void *)(unsigned long)vhost->task_set++; 3329 spin_unlock_irqrestore(shost->host_lock, flags); 3330 return 0; 3331 } 3332 3333 /** 3334 * ibmvfc_slave_configure - Configure the device 3335 * @sdev: struct scsi_device device to configure 3336 * 3337 * Enable allow_restart for a device if it is a disk. Adjust the 3338 * queue_depth here also. 3339 * 3340 * Returns: 3341 * 0 3342 **/ 3343 static int ibmvfc_slave_configure(struct scsi_device *sdev) 3344 { 3345 struct Scsi_Host *shost = sdev->host; 3346 unsigned long flags = 0; 3347 3348 spin_lock_irqsave(shost->host_lock, flags); 3349 if (sdev->type == TYPE_DISK) { 3350 sdev->allow_restart = 1; 3351 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); 3352 } 3353 spin_unlock_irqrestore(shost->host_lock, flags); 3354 return 0; 3355 } 3356 3357 /** 3358 * ibmvfc_change_queue_depth - Change the device's queue depth 3359 * @sdev: scsi device struct 3360 * @qdepth: depth to set 3361 * @reason: calling context 3362 * 3363 * Return value: 3364 * actual depth set 3365 **/ 3366 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth) 3367 { 3368 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN) 3369 qdepth = IBMVFC_MAX_CMDS_PER_LUN; 3370 3371 return scsi_change_queue_depth(sdev, qdepth); 3372 } 3373 3374 static ssize_t ibmvfc_show_host_partition_name(struct device *dev, 3375 struct device_attribute *attr, char *buf) 3376 { 3377 struct Scsi_Host *shost = class_to_shost(dev); 3378 struct ibmvfc_host *vhost = shost_priv(shost); 3379 3380 return snprintf(buf, PAGE_SIZE, "%s\n", 3381 vhost->login_buf->resp.partition_name); 3382 } 3383 3384 static ssize_t ibmvfc_show_host_device_name(struct device *dev, 3385 struct device_attribute *attr, char *buf) 3386 { 3387 struct Scsi_Host *shost = class_to_shost(dev); 3388 struct ibmvfc_host *vhost = shost_priv(shost); 3389 3390 return snprintf(buf, PAGE_SIZE, "%s\n", 3391 vhost->login_buf->resp.device_name); 3392 } 3393 3394 static ssize_t ibmvfc_show_host_loc_code(struct device *dev, 3395 struct device_attribute *attr, char *buf) 3396 { 3397 struct Scsi_Host *shost = class_to_shost(dev); 3398 struct ibmvfc_host *vhost = shost_priv(shost); 3399 3400 return snprintf(buf, PAGE_SIZE, "%s\n", 3401 vhost->login_buf->resp.port_loc_code); 3402 } 3403 3404 static ssize_t ibmvfc_show_host_drc_name(struct device *dev, 3405 struct device_attribute *attr, char *buf) 3406 { 3407 struct Scsi_Host *shost = class_to_shost(dev); 3408 struct ibmvfc_host *vhost = shost_priv(shost); 3409 3410 return snprintf(buf, PAGE_SIZE, "%s\n", 3411 vhost->login_buf->resp.drc_name); 3412 } 3413 3414 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev, 3415 struct device_attribute *attr, char *buf) 3416 { 3417 struct Scsi_Host *shost = class_to_shost(dev); 3418 struct ibmvfc_host *vhost = shost_priv(shost); 3419 return snprintf(buf, PAGE_SIZE, "%d\n", be32_to_cpu(vhost->login_buf->resp.version)); 3420 } 3421 3422 static ssize_t ibmvfc_show_host_capabilities(struct device *dev, 3423 struct device_attribute *attr, char *buf) 3424 { 3425 struct Scsi_Host *shost = class_to_shost(dev); 3426 struct ibmvfc_host *vhost = shost_priv(shost); 3427 return snprintf(buf, PAGE_SIZE, "%llx\n", be64_to_cpu(vhost->login_buf->resp.capabilities)); 3428 } 3429 3430 /** 3431 * ibmvfc_show_log_level - Show the adapter's error logging level 3432 * @dev: class device struct 3433 * @buf: buffer 3434 * 3435 * Return value: 3436 * number of bytes printed to buffer 3437 **/ 3438 static ssize_t ibmvfc_show_log_level(struct device *dev, 3439 struct device_attribute *attr, char *buf) 3440 { 3441 struct Scsi_Host *shost = class_to_shost(dev); 3442 struct ibmvfc_host *vhost = shost_priv(shost); 3443 unsigned long flags = 0; 3444 int len; 3445 3446 spin_lock_irqsave(shost->host_lock, flags); 3447 len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level); 3448 spin_unlock_irqrestore(shost->host_lock, flags); 3449 return len; 3450 } 3451 3452 /** 3453 * ibmvfc_store_log_level - Change the adapter's error logging level 3454 * @dev: class device struct 3455 * @buf: buffer 3456 * 3457 * Return value: 3458 * number of bytes printed to buffer 3459 **/ 3460 static ssize_t ibmvfc_store_log_level(struct device *dev, 3461 struct device_attribute *attr, 3462 const char *buf, size_t count) 3463 { 3464 struct Scsi_Host *shost = class_to_shost(dev); 3465 struct ibmvfc_host *vhost = shost_priv(shost); 3466 unsigned long flags = 0; 3467 3468 spin_lock_irqsave(shost->host_lock, flags); 3469 vhost->log_level = simple_strtoul(buf, NULL, 10); 3470 spin_unlock_irqrestore(shost->host_lock, flags); 3471 return strlen(buf); 3472 } 3473 3474 static ssize_t ibmvfc_show_scsi_channels(struct device *dev, 3475 struct device_attribute *attr, char *buf) 3476 { 3477 struct Scsi_Host *shost = class_to_shost(dev); 3478 struct ibmvfc_host *vhost = shost_priv(shost); 3479 unsigned long flags = 0; 3480 int len; 3481 3482 spin_lock_irqsave(shost->host_lock, flags); 3483 len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->client_scsi_channels); 3484 spin_unlock_irqrestore(shost->host_lock, flags); 3485 return len; 3486 } 3487 3488 static ssize_t ibmvfc_store_scsi_channels(struct device *dev, 3489 struct device_attribute *attr, 3490 const char *buf, size_t count) 3491 { 3492 struct Scsi_Host *shost = class_to_shost(dev); 3493 struct ibmvfc_host *vhost = shost_priv(shost); 3494 unsigned long flags = 0; 3495 unsigned int channels; 3496 3497 spin_lock_irqsave(shost->host_lock, flags); 3498 channels = simple_strtoul(buf, NULL, 10); 3499 vhost->client_scsi_channels = min(channels, nr_scsi_hw_queues); 3500 ibmvfc_hard_reset_host(vhost); 3501 spin_unlock_irqrestore(shost->host_lock, flags); 3502 return strlen(buf); 3503 } 3504 3505 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL); 3506 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL); 3507 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL); 3508 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL); 3509 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL); 3510 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL); 3511 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR, 3512 ibmvfc_show_log_level, ibmvfc_store_log_level); 3513 static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR, 3514 ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels); 3515 3516 #ifdef CONFIG_SCSI_IBMVFC_TRACE 3517 /** 3518 * ibmvfc_read_trace - Dump the adapter trace 3519 * @filp: open sysfs file 3520 * @kobj: kobject struct 3521 * @bin_attr: bin_attribute struct 3522 * @buf: buffer 3523 * @off: offset 3524 * @count: buffer size 3525 * 3526 * Return value: 3527 * number of bytes printed to buffer 3528 **/ 3529 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj, 3530 struct bin_attribute *bin_attr, 3531 char *buf, loff_t off, size_t count) 3532 { 3533 struct device *dev = container_of(kobj, struct device, kobj); 3534 struct Scsi_Host *shost = class_to_shost(dev); 3535 struct ibmvfc_host *vhost = shost_priv(shost); 3536 unsigned long flags = 0; 3537 int size = IBMVFC_TRACE_SIZE; 3538 char *src = (char *)vhost->trace; 3539 3540 if (off > size) 3541 return 0; 3542 if (off + count > size) { 3543 size -= off; 3544 count = size; 3545 } 3546 3547 spin_lock_irqsave(shost->host_lock, flags); 3548 memcpy(buf, &src[off], count); 3549 spin_unlock_irqrestore(shost->host_lock, flags); 3550 return count; 3551 } 3552 3553 static struct bin_attribute ibmvfc_trace_attr = { 3554 .attr = { 3555 .name = "trace", 3556 .mode = S_IRUGO, 3557 }, 3558 .size = 0, 3559 .read = ibmvfc_read_trace, 3560 }; 3561 #endif 3562 3563 static struct device_attribute *ibmvfc_attrs[] = { 3564 &dev_attr_partition_name, 3565 &dev_attr_device_name, 3566 &dev_attr_port_loc_code, 3567 &dev_attr_drc_name, 3568 &dev_attr_npiv_version, 3569 &dev_attr_capabilities, 3570 &dev_attr_log_level, 3571 &dev_attr_nr_scsi_channels, 3572 NULL 3573 }; 3574 3575 static struct scsi_host_template driver_template = { 3576 .module = THIS_MODULE, 3577 .name = "IBM POWER Virtual FC Adapter", 3578 .proc_name = IBMVFC_NAME, 3579 .queuecommand = ibmvfc_queuecommand, 3580 .eh_timed_out = fc_eh_timed_out, 3581 .eh_abort_handler = ibmvfc_eh_abort_handler, 3582 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler, 3583 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler, 3584 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler, 3585 .slave_alloc = ibmvfc_slave_alloc, 3586 .slave_configure = ibmvfc_slave_configure, 3587 .target_alloc = ibmvfc_target_alloc, 3588 .scan_finished = ibmvfc_scan_finished, 3589 .change_queue_depth = ibmvfc_change_queue_depth, 3590 .cmd_per_lun = 16, 3591 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT, 3592 .this_id = -1, 3593 .sg_tablesize = SG_ALL, 3594 .max_sectors = IBMVFC_MAX_SECTORS, 3595 .shost_attrs = ibmvfc_attrs, 3596 .track_queue_depth = 1, 3597 .host_tagset = 1, 3598 }; 3599 3600 /** 3601 * ibmvfc_next_async_crq - Returns the next entry in async queue 3602 * @vhost: ibmvfc host struct 3603 * 3604 * Returns: 3605 * Pointer to next entry in queue / NULL if empty 3606 **/ 3607 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost) 3608 { 3609 struct ibmvfc_queue *async_crq = &vhost->async_crq; 3610 struct ibmvfc_async_crq *crq; 3611 3612 crq = &async_crq->msgs.async[async_crq->cur]; 3613 if (crq->valid & 0x80) { 3614 if (++async_crq->cur == async_crq->size) 3615 async_crq->cur = 0; 3616 rmb(); 3617 } else 3618 crq = NULL; 3619 3620 return crq; 3621 } 3622 3623 /** 3624 * ibmvfc_next_crq - Returns the next entry in message queue 3625 * @vhost: ibmvfc host struct 3626 * 3627 * Returns: 3628 * Pointer to next entry in queue / NULL if empty 3629 **/ 3630 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost) 3631 { 3632 struct ibmvfc_queue *queue = &vhost->crq; 3633 struct ibmvfc_crq *crq; 3634 3635 crq = &queue->msgs.crq[queue->cur]; 3636 if (crq->valid & 0x80) { 3637 if (++queue->cur == queue->size) 3638 queue->cur = 0; 3639 rmb(); 3640 } else 3641 crq = NULL; 3642 3643 return crq; 3644 } 3645 3646 /** 3647 * ibmvfc_interrupt - Interrupt handler 3648 * @irq: number of irq to handle, not used 3649 * @dev_instance: ibmvfc_host that received interrupt 3650 * 3651 * Returns: 3652 * IRQ_HANDLED 3653 **/ 3654 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance) 3655 { 3656 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance; 3657 unsigned long flags; 3658 3659 spin_lock_irqsave(vhost->host->host_lock, flags); 3660 vio_disable_interrupts(to_vio_dev(vhost->dev)); 3661 tasklet_schedule(&vhost->tasklet); 3662 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3663 return IRQ_HANDLED; 3664 } 3665 3666 /** 3667 * ibmvfc_tasklet - Interrupt handler tasklet 3668 * @data: ibmvfc host struct 3669 * 3670 * Returns: 3671 * Nothing 3672 **/ 3673 static void ibmvfc_tasklet(void *data) 3674 { 3675 struct ibmvfc_host *vhost = data; 3676 struct vio_dev *vdev = to_vio_dev(vhost->dev); 3677 struct ibmvfc_crq *crq; 3678 struct ibmvfc_async_crq *async; 3679 struct ibmvfc_event *evt, *temp; 3680 unsigned long flags; 3681 int done = 0; 3682 LIST_HEAD(evt_doneq); 3683 3684 spin_lock_irqsave(vhost->host->host_lock, flags); 3685 spin_lock(vhost->crq.q_lock); 3686 while (!done) { 3687 /* Pull all the valid messages off the async CRQ */ 3688 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 3689 ibmvfc_handle_async(async, vhost); 3690 async->valid = 0; 3691 wmb(); 3692 } 3693 3694 /* Pull all the valid messages off the CRQ */ 3695 while ((crq = ibmvfc_next_crq(vhost)) != NULL) { 3696 ibmvfc_handle_crq(crq, vhost, &evt_doneq); 3697 crq->valid = 0; 3698 wmb(); 3699 } 3700 3701 vio_enable_interrupts(vdev); 3702 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 3703 vio_disable_interrupts(vdev); 3704 ibmvfc_handle_async(async, vhost); 3705 async->valid = 0; 3706 wmb(); 3707 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) { 3708 vio_disable_interrupts(vdev); 3709 ibmvfc_handle_crq(crq, vhost, &evt_doneq); 3710 crq->valid = 0; 3711 wmb(); 3712 } else 3713 done = 1; 3714 } 3715 3716 spin_unlock(vhost->crq.q_lock); 3717 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3718 3719 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) { 3720 del_timer(&evt->timer); 3721 list_del(&evt->queue_list); 3722 ibmvfc_trc_end(evt); 3723 evt->done(evt); 3724 } 3725 } 3726 3727 static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable) 3728 { 3729 struct device *dev = scrq->vhost->dev; 3730 struct vio_dev *vdev = to_vio_dev(dev); 3731 unsigned long rc; 3732 int irq_action = H_ENABLE_VIO_INTERRUPT; 3733 3734 if (!enable) 3735 irq_action = H_DISABLE_VIO_INTERRUPT; 3736 3737 rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action, 3738 scrq->hw_irq, 0, 0); 3739 3740 if (rc) 3741 dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n", 3742 enable ? "enable" : "disable", scrq->hwq_id, rc); 3743 3744 return rc; 3745 } 3746 3747 static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost, 3748 struct list_head *evt_doneq) 3749 { 3750 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba); 3751 3752 switch (crq->valid) { 3753 case IBMVFC_CRQ_CMD_RSP: 3754 break; 3755 case IBMVFC_CRQ_XPORT_EVENT: 3756 return; 3757 default: 3758 dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid); 3759 return; 3760 } 3761 3762 /* The only kind of payload CRQs we should get are responses to 3763 * things we send. Make sure this response is to something we 3764 * actually sent 3765 */ 3766 if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) { 3767 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n", 3768 crq->ioba); 3769 return; 3770 } 3771 3772 if (unlikely(atomic_read(&evt->free))) { 3773 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n", 3774 crq->ioba); 3775 return; 3776 } 3777 3778 spin_lock(&evt->queue->l_lock); 3779 list_move_tail(&evt->queue_list, evt_doneq); 3780 spin_unlock(&evt->queue->l_lock); 3781 } 3782 3783 static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq) 3784 { 3785 struct ibmvfc_crq *crq; 3786 3787 crq = &scrq->msgs.scrq[scrq->cur].crq; 3788 if (crq->valid & 0x80) { 3789 if (++scrq->cur == scrq->size) 3790 scrq->cur = 0; 3791 rmb(); 3792 } else 3793 crq = NULL; 3794 3795 return crq; 3796 } 3797 3798 static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq) 3799 { 3800 struct ibmvfc_crq *crq; 3801 struct ibmvfc_event *evt, *temp; 3802 unsigned long flags; 3803 int done = 0; 3804 LIST_HEAD(evt_doneq); 3805 3806 spin_lock_irqsave(scrq->q_lock, flags); 3807 while (!done) { 3808 while ((crq = ibmvfc_next_scrq(scrq)) != NULL) { 3809 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq); 3810 crq->valid = 0; 3811 wmb(); 3812 } 3813 3814 ibmvfc_toggle_scrq_irq(scrq, 1); 3815 if ((crq = ibmvfc_next_scrq(scrq)) != NULL) { 3816 ibmvfc_toggle_scrq_irq(scrq, 0); 3817 ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq); 3818 crq->valid = 0; 3819 wmb(); 3820 } else 3821 done = 1; 3822 } 3823 spin_unlock_irqrestore(scrq->q_lock, flags); 3824 3825 list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) { 3826 del_timer(&evt->timer); 3827 list_del(&evt->queue_list); 3828 ibmvfc_trc_end(evt); 3829 evt->done(evt); 3830 } 3831 } 3832 3833 static irqreturn_t ibmvfc_interrupt_scsi(int irq, void *scrq_instance) 3834 { 3835 struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance; 3836 3837 ibmvfc_toggle_scrq_irq(scrq, 0); 3838 ibmvfc_drain_sub_crq(scrq); 3839 3840 return IRQ_HANDLED; 3841 } 3842 3843 /** 3844 * ibmvfc_init_tgt - Set the next init job step for the target 3845 * @tgt: ibmvfc target struct 3846 * @job_step: job step to perform 3847 * 3848 **/ 3849 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt, 3850 void (*job_step) (struct ibmvfc_target *)) 3851 { 3852 if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT)) 3853 tgt->job_step = job_step; 3854 wake_up(&tgt->vhost->work_wait_q); 3855 } 3856 3857 /** 3858 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization 3859 * @tgt: ibmvfc target struct 3860 * @job_step: initialization job step 3861 * 3862 * Returns: 1 if step will be retried / 0 if not 3863 * 3864 **/ 3865 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt, 3866 void (*job_step) (struct ibmvfc_target *)) 3867 { 3868 if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) { 3869 ibmvfc_del_tgt(tgt); 3870 wake_up(&tgt->vhost->work_wait_q); 3871 return 0; 3872 } else 3873 ibmvfc_init_tgt(tgt, job_step); 3874 return 1; 3875 } 3876 3877 /* Defined in FC-LS */ 3878 static const struct { 3879 int code; 3880 int retry; 3881 int logged_in; 3882 } prli_rsp [] = { 3883 { 0, 1, 0 }, 3884 { 1, 0, 1 }, 3885 { 2, 1, 0 }, 3886 { 3, 1, 0 }, 3887 { 4, 0, 0 }, 3888 { 5, 0, 0 }, 3889 { 6, 0, 1 }, 3890 { 7, 0, 0 }, 3891 { 8, 1, 0 }, 3892 }; 3893 3894 /** 3895 * ibmvfc_get_prli_rsp - Find PRLI response index 3896 * @flags: PRLI response flags 3897 * 3898 **/ 3899 static int ibmvfc_get_prli_rsp(u16 flags) 3900 { 3901 int i; 3902 int code = (flags & 0x0f00) >> 8; 3903 3904 for (i = 0; i < ARRAY_SIZE(prli_rsp); i++) 3905 if (prli_rsp[i].code == code) 3906 return i; 3907 3908 return 0; 3909 } 3910 3911 /** 3912 * ibmvfc_tgt_prli_done - Completion handler for Process Login 3913 * @evt: ibmvfc event struct 3914 * 3915 **/ 3916 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt) 3917 { 3918 struct ibmvfc_target *tgt = evt->tgt; 3919 struct ibmvfc_host *vhost = evt->vhost; 3920 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli; 3921 struct ibmvfc_prli_svc_parms *parms = &rsp->parms; 3922 u32 status = be16_to_cpu(rsp->common.status); 3923 int index, level = IBMVFC_DEFAULT_LOG_LEVEL; 3924 3925 vhost->discovery_threads--; 3926 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3927 switch (status) { 3928 case IBMVFC_MAD_SUCCESS: 3929 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n", 3930 parms->type, parms->flags, parms->service_parms); 3931 3932 if (parms->type == IBMVFC_SCSI_FCP_TYPE) { 3933 index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags)); 3934 if (prli_rsp[index].logged_in) { 3935 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) { 3936 tgt->need_login = 0; 3937 tgt->ids.roles = 0; 3938 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC) 3939 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET; 3940 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC) 3941 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR; 3942 tgt->add_rport = 1; 3943 } else 3944 ibmvfc_del_tgt(tgt); 3945 } else if (prli_rsp[index].retry) 3946 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 3947 else 3948 ibmvfc_del_tgt(tgt); 3949 } else 3950 ibmvfc_del_tgt(tgt); 3951 break; 3952 case IBMVFC_MAD_DRIVER_FAILED: 3953 break; 3954 case IBMVFC_MAD_CRQ_ERROR: 3955 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 3956 break; 3957 case IBMVFC_MAD_FAILED: 3958 default: 3959 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) && 3960 be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED) 3961 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 3962 else if (tgt->logo_rcvd) 3963 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 3964 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 3965 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 3966 else 3967 ibmvfc_del_tgt(tgt); 3968 3969 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n", 3970 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 3971 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status); 3972 break; 3973 } 3974 3975 kref_put(&tgt->kref, ibmvfc_release_tgt); 3976 ibmvfc_free_event(evt); 3977 wake_up(&vhost->work_wait_q); 3978 } 3979 3980 /** 3981 * ibmvfc_tgt_send_prli - Send a process login 3982 * @tgt: ibmvfc target struct 3983 * 3984 **/ 3985 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt) 3986 { 3987 struct ibmvfc_process_login *prli; 3988 struct ibmvfc_host *vhost = tgt->vhost; 3989 struct ibmvfc_event *evt; 3990 3991 if (vhost->discovery_threads >= disc_threads) 3992 return; 3993 3994 kref_get(&tgt->kref); 3995 evt = ibmvfc_get_event(&vhost->crq); 3996 vhost->discovery_threads++; 3997 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT); 3998 evt->tgt = tgt; 3999 prli = &evt->iu.prli; 4000 memset(prli, 0, sizeof(*prli)); 4001 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 4002 prli->common.version = cpu_to_be32(2); 4003 prli->target_wwpn = cpu_to_be64(tgt->wwpn); 4004 } else { 4005 prli->common.version = cpu_to_be32(1); 4006 } 4007 prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN); 4008 prli->common.length = cpu_to_be16(sizeof(*prli)); 4009 prli->scsi_id = cpu_to_be64(tgt->scsi_id); 4010 4011 prli->parms.type = IBMVFC_SCSI_FCP_TYPE; 4012 prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR); 4013 prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC); 4014 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED); 4015 4016 if (cls3_error) 4017 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY); 4018 4019 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4020 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4021 vhost->discovery_threads--; 4022 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4023 kref_put(&tgt->kref, ibmvfc_release_tgt); 4024 } else 4025 tgt_dbg(tgt, "Sent process login\n"); 4026 } 4027 4028 /** 4029 * ibmvfc_tgt_plogi_done - Completion handler for Port Login 4030 * @evt: ibmvfc event struct 4031 * 4032 **/ 4033 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt) 4034 { 4035 struct ibmvfc_target *tgt = evt->tgt; 4036 struct ibmvfc_host *vhost = evt->vhost; 4037 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi; 4038 u32 status = be16_to_cpu(rsp->common.status); 4039 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4040 4041 vhost->discovery_threads--; 4042 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4043 switch (status) { 4044 case IBMVFC_MAD_SUCCESS: 4045 tgt_dbg(tgt, "Port Login succeeded\n"); 4046 if (tgt->ids.port_name && 4047 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) { 4048 vhost->reinit = 1; 4049 tgt_dbg(tgt, "Port re-init required\n"); 4050 break; 4051 } 4052 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name); 4053 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name); 4054 tgt->ids.port_id = tgt->scsi_id; 4055 memcpy(&tgt->service_parms, &rsp->service_parms, 4056 sizeof(tgt->service_parms)); 4057 memcpy(&tgt->service_parms_change, &rsp->service_parms_change, 4058 sizeof(tgt->service_parms_change)); 4059 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli); 4060 break; 4061 case IBMVFC_MAD_DRIVER_FAILED: 4062 break; 4063 case IBMVFC_MAD_CRQ_ERROR: 4064 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4065 break; 4066 case IBMVFC_MAD_FAILED: 4067 default: 4068 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 4069 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 4070 else 4071 ibmvfc_del_tgt(tgt); 4072 4073 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 4074 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4075 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), 4076 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type), 4077 ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status); 4078 break; 4079 } 4080 4081 kref_put(&tgt->kref, ibmvfc_release_tgt); 4082 ibmvfc_free_event(evt); 4083 wake_up(&vhost->work_wait_q); 4084 } 4085 4086 /** 4087 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target 4088 * @tgt: ibmvfc target struct 4089 * 4090 **/ 4091 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt) 4092 { 4093 struct ibmvfc_port_login *plogi; 4094 struct ibmvfc_host *vhost = tgt->vhost; 4095 struct ibmvfc_event *evt; 4096 4097 if (vhost->discovery_threads >= disc_threads) 4098 return; 4099 4100 kref_get(&tgt->kref); 4101 tgt->logo_rcvd = 0; 4102 evt = ibmvfc_get_event(&vhost->crq); 4103 vhost->discovery_threads++; 4104 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4105 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT); 4106 evt->tgt = tgt; 4107 plogi = &evt->iu.plogi; 4108 memset(plogi, 0, sizeof(*plogi)); 4109 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 4110 plogi->common.version = cpu_to_be32(2); 4111 plogi->target_wwpn = cpu_to_be64(tgt->wwpn); 4112 } else { 4113 plogi->common.version = cpu_to_be32(1); 4114 } 4115 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN); 4116 plogi->common.length = cpu_to_be16(sizeof(*plogi)); 4117 plogi->scsi_id = cpu_to_be64(tgt->scsi_id); 4118 4119 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4120 vhost->discovery_threads--; 4121 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4122 kref_put(&tgt->kref, ibmvfc_release_tgt); 4123 } else 4124 tgt_dbg(tgt, "Sent port login\n"); 4125 } 4126 4127 /** 4128 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD 4129 * @evt: ibmvfc event struct 4130 * 4131 **/ 4132 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt) 4133 { 4134 struct ibmvfc_target *tgt = evt->tgt; 4135 struct ibmvfc_host *vhost = evt->vhost; 4136 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout; 4137 u32 status = be16_to_cpu(rsp->common.status); 4138 4139 vhost->discovery_threads--; 4140 ibmvfc_free_event(evt); 4141 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4142 4143 switch (status) { 4144 case IBMVFC_MAD_SUCCESS: 4145 tgt_dbg(tgt, "Implicit Logout succeeded\n"); 4146 break; 4147 case IBMVFC_MAD_DRIVER_FAILED: 4148 kref_put(&tgt->kref, ibmvfc_release_tgt); 4149 wake_up(&vhost->work_wait_q); 4150 return; 4151 case IBMVFC_MAD_FAILED: 4152 default: 4153 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status); 4154 break; 4155 } 4156 4157 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi); 4158 kref_put(&tgt->kref, ibmvfc_release_tgt); 4159 wake_up(&vhost->work_wait_q); 4160 } 4161 4162 /** 4163 * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout 4164 * @tgt: ibmvfc target struct 4165 * 4166 * Returns: 4167 * Allocated and initialized ibmvfc_event struct 4168 **/ 4169 static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt, 4170 void (*done) (struct ibmvfc_event *)) 4171 { 4172 struct ibmvfc_implicit_logout *mad; 4173 struct ibmvfc_host *vhost = tgt->vhost; 4174 struct ibmvfc_event *evt; 4175 4176 kref_get(&tgt->kref); 4177 evt = ibmvfc_get_event(&vhost->crq); 4178 ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT); 4179 evt->tgt = tgt; 4180 mad = &evt->iu.implicit_logout; 4181 memset(mad, 0, sizeof(*mad)); 4182 mad->common.version = cpu_to_be32(1); 4183 mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT); 4184 mad->common.length = cpu_to_be16(sizeof(*mad)); 4185 mad->old_scsi_id = cpu_to_be64(tgt->scsi_id); 4186 return evt; 4187 } 4188 4189 /** 4190 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target 4191 * @tgt: ibmvfc target struct 4192 * 4193 **/ 4194 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt) 4195 { 4196 struct ibmvfc_host *vhost = tgt->vhost; 4197 struct ibmvfc_event *evt; 4198 4199 if (vhost->discovery_threads >= disc_threads) 4200 return; 4201 4202 vhost->discovery_threads++; 4203 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt, 4204 ibmvfc_tgt_implicit_logout_done); 4205 4206 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4207 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4208 vhost->discovery_threads--; 4209 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4210 kref_put(&tgt->kref, ibmvfc_release_tgt); 4211 } else 4212 tgt_dbg(tgt, "Sent Implicit Logout\n"); 4213 } 4214 4215 /** 4216 * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD 4217 * @evt: ibmvfc event struct 4218 * 4219 **/ 4220 static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt) 4221 { 4222 struct ibmvfc_target *tgt = evt->tgt; 4223 struct ibmvfc_host *vhost = evt->vhost; 4224 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru; 4225 u32 status = be16_to_cpu(mad->common.status); 4226 4227 vhost->discovery_threads--; 4228 ibmvfc_free_event(evt); 4229 4230 /* 4231 * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the 4232 * driver in which case we need to free up all the targets. If we are 4233 * not unloading, we will still go through a hard reset to get out of 4234 * offline state, so there is no need to track the old targets in that 4235 * case. 4236 */ 4237 if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE) 4238 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4239 else 4240 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT); 4241 4242 tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed"); 4243 kref_put(&tgt->kref, ibmvfc_release_tgt); 4244 wake_up(&vhost->work_wait_q); 4245 } 4246 4247 /** 4248 * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target 4249 * @tgt: ibmvfc target struct 4250 * 4251 **/ 4252 static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt) 4253 { 4254 struct ibmvfc_host *vhost = tgt->vhost; 4255 struct ibmvfc_event *evt; 4256 4257 if (!vhost->logged_in) { 4258 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4259 return; 4260 } 4261 4262 if (vhost->discovery_threads >= disc_threads) 4263 return; 4264 4265 vhost->discovery_threads++; 4266 evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt, 4267 ibmvfc_tgt_implicit_logout_and_del_done); 4268 4269 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT); 4270 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4271 vhost->discovery_threads--; 4272 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4273 kref_put(&tgt->kref, ibmvfc_release_tgt); 4274 } else 4275 tgt_dbg(tgt, "Sent Implicit Logout\n"); 4276 } 4277 4278 /** 4279 * ibmvfc_tgt_move_login_done - Completion handler for Move Login 4280 * @evt: ibmvfc event struct 4281 * 4282 **/ 4283 static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt) 4284 { 4285 struct ibmvfc_target *tgt = evt->tgt; 4286 struct ibmvfc_host *vhost = evt->vhost; 4287 struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login; 4288 u32 status = be16_to_cpu(rsp->common.status); 4289 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4290 4291 vhost->discovery_threads--; 4292 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4293 switch (status) { 4294 case IBMVFC_MAD_SUCCESS: 4295 tgt_dbg(tgt, "Move Login succeeded for old scsi_id: %llX\n", tgt->old_scsi_id); 4296 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name); 4297 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name); 4298 tgt->ids.port_id = tgt->scsi_id; 4299 memcpy(&tgt->service_parms, &rsp->service_parms, 4300 sizeof(tgt->service_parms)); 4301 memcpy(&tgt->service_parms_change, &rsp->service_parms_change, 4302 sizeof(tgt->service_parms_change)); 4303 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli); 4304 break; 4305 case IBMVFC_MAD_DRIVER_FAILED: 4306 break; 4307 case IBMVFC_MAD_CRQ_ERROR: 4308 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login); 4309 break; 4310 case IBMVFC_MAD_FAILED: 4311 default: 4312 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login); 4313 4314 tgt_log(tgt, level, 4315 "Move Login failed: old scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n", 4316 tgt->old_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags), 4317 status); 4318 break; 4319 } 4320 4321 kref_put(&tgt->kref, ibmvfc_release_tgt); 4322 ibmvfc_free_event(evt); 4323 wake_up(&vhost->work_wait_q); 4324 } 4325 4326 4327 /** 4328 * ibmvfc_tgt_move_login - Initiate a move login for specified target 4329 * @tgt: ibmvfc target struct 4330 * 4331 **/ 4332 static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt) 4333 { 4334 struct ibmvfc_host *vhost = tgt->vhost; 4335 struct ibmvfc_move_login *move; 4336 struct ibmvfc_event *evt; 4337 4338 if (vhost->discovery_threads >= disc_threads) 4339 return; 4340 4341 kref_get(&tgt->kref); 4342 evt = ibmvfc_get_event(&vhost->crq); 4343 vhost->discovery_threads++; 4344 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4345 ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT); 4346 evt->tgt = tgt; 4347 move = &evt->iu.move_login; 4348 memset(move, 0, sizeof(*move)); 4349 move->common.version = cpu_to_be32(1); 4350 move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN); 4351 move->common.length = cpu_to_be16(sizeof(*move)); 4352 4353 move->old_scsi_id = cpu_to_be64(tgt->old_scsi_id); 4354 move->new_scsi_id = cpu_to_be64(tgt->scsi_id); 4355 move->wwpn = cpu_to_be64(tgt->wwpn); 4356 move->node_name = cpu_to_be64(tgt->ids.node_name); 4357 4358 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4359 vhost->discovery_threads--; 4360 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 4361 kref_put(&tgt->kref, ibmvfc_release_tgt); 4362 } else 4363 tgt_dbg(tgt, "Sent Move Login for old scsi_id: %llX\n", tgt->old_scsi_id); 4364 } 4365 4366 /** 4367 * ibmvfc_adisc_needs_plogi - Does device need PLOGI? 4368 * @mad: ibmvfc passthru mad struct 4369 * @tgt: ibmvfc target struct 4370 * 4371 * Returns: 4372 * 1 if PLOGI needed / 0 if PLOGI not needed 4373 **/ 4374 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad, 4375 struct ibmvfc_target *tgt) 4376 { 4377 if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name) 4378 return 1; 4379 if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name) 4380 return 1; 4381 if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id) 4382 return 1; 4383 return 0; 4384 } 4385 4386 /** 4387 * ibmvfc_tgt_adisc_done - Completion handler for ADISC 4388 * @evt: ibmvfc event struct 4389 * 4390 **/ 4391 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt) 4392 { 4393 struct ibmvfc_target *tgt = evt->tgt; 4394 struct ibmvfc_host *vhost = evt->vhost; 4395 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru; 4396 u32 status = be16_to_cpu(mad->common.status); 4397 u8 fc_reason, fc_explain; 4398 4399 vhost->discovery_threads--; 4400 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4401 del_timer(&tgt->timer); 4402 4403 switch (status) { 4404 case IBMVFC_MAD_SUCCESS: 4405 tgt_dbg(tgt, "ADISC succeeded\n"); 4406 if (ibmvfc_adisc_needs_plogi(mad, tgt)) 4407 ibmvfc_del_tgt(tgt); 4408 break; 4409 case IBMVFC_MAD_DRIVER_FAILED: 4410 break; 4411 case IBMVFC_MAD_FAILED: 4412 default: 4413 ibmvfc_del_tgt(tgt); 4414 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16; 4415 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8; 4416 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 4417 ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)), 4418 be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error), 4419 ibmvfc_get_fc_type(fc_reason), fc_reason, 4420 ibmvfc_get_ls_explain(fc_explain), fc_explain, status); 4421 break; 4422 } 4423 4424 kref_put(&tgt->kref, ibmvfc_release_tgt); 4425 ibmvfc_free_event(evt); 4426 wake_up(&vhost->work_wait_q); 4427 } 4428 4429 /** 4430 * ibmvfc_init_passthru - Initialize an event struct for FC passthru 4431 * @evt: ibmvfc event struct 4432 * 4433 **/ 4434 static void ibmvfc_init_passthru(struct ibmvfc_event *evt) 4435 { 4436 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru; 4437 4438 memset(mad, 0, sizeof(*mad)); 4439 mad->common.version = cpu_to_be32(1); 4440 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU); 4441 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu)); 4442 mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + 4443 offsetof(struct ibmvfc_passthru_mad, iu)); 4444 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu)); 4445 mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload)); 4446 mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response)); 4447 mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + 4448 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 4449 offsetof(struct ibmvfc_passthru_fc_iu, payload)); 4450 mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload)); 4451 mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) + 4452 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 4453 offsetof(struct ibmvfc_passthru_fc_iu, response)); 4454 mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response)); 4455 } 4456 4457 /** 4458 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC 4459 * @evt: ibmvfc event struct 4460 * 4461 * Just cleanup this event struct. Everything else is handled by 4462 * the ADISC completion handler. If the ADISC never actually comes 4463 * back, we still have the timer running on the ADISC event struct 4464 * which will fire and cause the CRQ to get reset. 4465 * 4466 **/ 4467 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt) 4468 { 4469 struct ibmvfc_host *vhost = evt->vhost; 4470 struct ibmvfc_target *tgt = evt->tgt; 4471 4472 tgt_dbg(tgt, "ADISC cancel complete\n"); 4473 vhost->abort_threads--; 4474 ibmvfc_free_event(evt); 4475 kref_put(&tgt->kref, ibmvfc_release_tgt); 4476 wake_up(&vhost->work_wait_q); 4477 } 4478 4479 /** 4480 * ibmvfc_adisc_timeout - Handle an ADISC timeout 4481 * @tgt: ibmvfc target struct 4482 * 4483 * If an ADISC times out, send a cancel. If the cancel times 4484 * out, reset the CRQ. When the ADISC comes back as cancelled, 4485 * log back into the target. 4486 **/ 4487 static void ibmvfc_adisc_timeout(struct timer_list *t) 4488 { 4489 struct ibmvfc_target *tgt = from_timer(tgt, t, timer); 4490 struct ibmvfc_host *vhost = tgt->vhost; 4491 struct ibmvfc_event *evt; 4492 struct ibmvfc_tmf *tmf; 4493 unsigned long flags; 4494 int rc; 4495 4496 tgt_dbg(tgt, "ADISC timeout\n"); 4497 spin_lock_irqsave(vhost->host->host_lock, flags); 4498 if (vhost->abort_threads >= disc_threads || 4499 tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT || 4500 vhost->state != IBMVFC_INITIALIZING || 4501 vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) { 4502 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4503 return; 4504 } 4505 4506 vhost->abort_threads++; 4507 kref_get(&tgt->kref); 4508 evt = ibmvfc_get_event(&vhost->crq); 4509 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT); 4510 4511 evt->tgt = tgt; 4512 tmf = &evt->iu.tmf; 4513 memset(tmf, 0, sizeof(*tmf)); 4514 if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) { 4515 tmf->common.version = cpu_to_be32(2); 4516 tmf->target_wwpn = cpu_to_be64(tgt->wwpn); 4517 } else { 4518 tmf->common.version = cpu_to_be32(1); 4519 } 4520 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD); 4521 tmf->common.length = cpu_to_be16(sizeof(*tmf)); 4522 tmf->scsi_id = cpu_to_be64(tgt->scsi_id); 4523 tmf->cancel_key = cpu_to_be32(tgt->cancel_key); 4524 4525 rc = ibmvfc_send_event(evt, vhost, default_timeout); 4526 4527 if (rc) { 4528 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc); 4529 vhost->abort_threads--; 4530 kref_put(&tgt->kref, ibmvfc_release_tgt); 4531 __ibmvfc_reset_host(vhost); 4532 } else 4533 tgt_dbg(tgt, "Attempting to cancel ADISC\n"); 4534 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4535 } 4536 4537 /** 4538 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target 4539 * @tgt: ibmvfc target struct 4540 * 4541 * When sending an ADISC we end up with two timers running. The 4542 * first timer is the timer in the ibmvfc target struct. If this 4543 * fires, we send a cancel to the target. The second timer is the 4544 * timer on the ibmvfc event for the ADISC, which is longer. If that 4545 * fires, it means the ADISC timed out and our attempt to cancel it 4546 * also failed, so we need to reset the CRQ. 4547 **/ 4548 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt) 4549 { 4550 struct ibmvfc_passthru_mad *mad; 4551 struct ibmvfc_host *vhost = tgt->vhost; 4552 struct ibmvfc_event *evt; 4553 4554 if (vhost->discovery_threads >= disc_threads) 4555 return; 4556 4557 kref_get(&tgt->kref); 4558 evt = ibmvfc_get_event(&vhost->crq); 4559 vhost->discovery_threads++; 4560 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT); 4561 evt->tgt = tgt; 4562 4563 ibmvfc_init_passthru(evt); 4564 mad = &evt->iu.passthru; 4565 mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS); 4566 mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id); 4567 mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key); 4568 4569 mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC); 4570 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name, 4571 sizeof(vhost->login_buf->resp.port_name)); 4572 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name, 4573 sizeof(vhost->login_buf->resp.node_name)); 4574 mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff); 4575 4576 if (timer_pending(&tgt->timer)) 4577 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ)); 4578 else { 4579 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ); 4580 add_timer(&tgt->timer); 4581 } 4582 4583 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4584 if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) { 4585 vhost->discovery_threads--; 4586 del_timer(&tgt->timer); 4587 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4588 kref_put(&tgt->kref, ibmvfc_release_tgt); 4589 } else 4590 tgt_dbg(tgt, "Sent ADISC\n"); 4591 } 4592 4593 /** 4594 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD 4595 * @evt: ibmvfc event struct 4596 * 4597 **/ 4598 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt) 4599 { 4600 struct ibmvfc_target *tgt = evt->tgt; 4601 struct ibmvfc_host *vhost = evt->vhost; 4602 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt; 4603 u32 status = be16_to_cpu(rsp->common.status); 4604 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4605 4606 vhost->discovery_threads--; 4607 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4608 switch (status) { 4609 case IBMVFC_MAD_SUCCESS: 4610 tgt_dbg(tgt, "Query Target succeeded\n"); 4611 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id) 4612 ibmvfc_del_tgt(tgt); 4613 else 4614 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc); 4615 break; 4616 case IBMVFC_MAD_DRIVER_FAILED: 4617 break; 4618 case IBMVFC_MAD_CRQ_ERROR: 4619 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 4620 break; 4621 case IBMVFC_MAD_FAILED: 4622 default: 4623 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED && 4624 be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ && 4625 be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG) 4626 ibmvfc_del_tgt(tgt); 4627 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 4628 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 4629 else 4630 ibmvfc_del_tgt(tgt); 4631 4632 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 4633 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4634 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), 4635 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type), 4636 ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), 4637 status); 4638 break; 4639 } 4640 4641 kref_put(&tgt->kref, ibmvfc_release_tgt); 4642 ibmvfc_free_event(evt); 4643 wake_up(&vhost->work_wait_q); 4644 } 4645 4646 /** 4647 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target 4648 * @tgt: ibmvfc target struct 4649 * 4650 **/ 4651 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt) 4652 { 4653 struct ibmvfc_query_tgt *query_tgt; 4654 struct ibmvfc_host *vhost = tgt->vhost; 4655 struct ibmvfc_event *evt; 4656 4657 if (vhost->discovery_threads >= disc_threads) 4658 return; 4659 4660 kref_get(&tgt->kref); 4661 evt = ibmvfc_get_event(&vhost->crq); 4662 vhost->discovery_threads++; 4663 evt->tgt = tgt; 4664 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT); 4665 query_tgt = &evt->iu.query_tgt; 4666 memset(query_tgt, 0, sizeof(*query_tgt)); 4667 query_tgt->common.version = cpu_to_be32(1); 4668 query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET); 4669 query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt)); 4670 query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name); 4671 4672 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 4673 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 4674 vhost->discovery_threads--; 4675 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 4676 kref_put(&tgt->kref, ibmvfc_release_tgt); 4677 } else 4678 tgt_dbg(tgt, "Sent Query Target\n"); 4679 } 4680 4681 /** 4682 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target 4683 * @vhost: ibmvfc host struct 4684 * @scsi_id: SCSI ID to allocate target for 4685 * 4686 * Returns: 4687 * 0 on success / other on failure 4688 **/ 4689 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, 4690 struct ibmvfc_discover_targets_entry *target) 4691 { 4692 struct ibmvfc_target *stgt = NULL; 4693 struct ibmvfc_target *wtgt = NULL; 4694 struct ibmvfc_target *tgt; 4695 unsigned long flags; 4696 u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK; 4697 u64 wwpn = be64_to_cpu(target->wwpn); 4698 4699 /* Look to see if we already have a target allocated for this SCSI ID or WWPN */ 4700 spin_lock_irqsave(vhost->host->host_lock, flags); 4701 list_for_each_entry(tgt, &vhost->targets, queue) { 4702 if (tgt->wwpn == wwpn) { 4703 wtgt = tgt; 4704 break; 4705 } 4706 } 4707 4708 list_for_each_entry(tgt, &vhost->targets, queue) { 4709 if (tgt->scsi_id == scsi_id) { 4710 stgt = tgt; 4711 break; 4712 } 4713 } 4714 4715 if (wtgt && !stgt) { 4716 /* 4717 * A WWPN target has moved and we still are tracking the old 4718 * SCSI ID. The only way we should be able to get here is if 4719 * we attempted to send an implicit logout for the old SCSI ID 4720 * and it failed for some reason, such as there being I/O 4721 * pending to the target. In this case, we will have already 4722 * deleted the rport from the FC transport so we do a move 4723 * login, which works even with I/O pending, as it will cancel 4724 * any active commands. 4725 */ 4726 if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) { 4727 /* 4728 * Do a move login here. The old target is no longer 4729 * known to the transport layer We don't use the 4730 * normal ibmvfc_set_tgt_action to set this, as we 4731 * don't normally want to allow this state change. 4732 */ 4733 wtgt->old_scsi_id = wtgt->scsi_id; 4734 wtgt->scsi_id = scsi_id; 4735 wtgt->action = IBMVFC_TGT_ACTION_INIT; 4736 ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login); 4737 goto unlock_out; 4738 } else { 4739 tgt_err(wtgt, "Unexpected target state: %d, %p\n", 4740 wtgt->action, wtgt->rport); 4741 } 4742 } else if (stgt) { 4743 if (tgt->need_login) 4744 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 4745 goto unlock_out; 4746 } 4747 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4748 4749 tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO); 4750 memset(tgt, 0, sizeof(*tgt)); 4751 tgt->scsi_id = scsi_id; 4752 tgt->wwpn = wwpn; 4753 tgt->vhost = vhost; 4754 tgt->need_login = 1; 4755 timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0); 4756 kref_init(&tgt->kref); 4757 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 4758 spin_lock_irqsave(vhost->host->host_lock, flags); 4759 tgt->cancel_key = vhost->task_set++; 4760 list_add_tail(&tgt->queue, &vhost->targets); 4761 4762 unlock_out: 4763 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4764 return 0; 4765 } 4766 4767 /** 4768 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets 4769 * @vhost: ibmvfc host struct 4770 * 4771 * Returns: 4772 * 0 on success / other on failure 4773 **/ 4774 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost) 4775 { 4776 int i, rc; 4777 4778 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++) 4779 rc = ibmvfc_alloc_target(vhost, &vhost->disc_buf[i]); 4780 4781 return rc; 4782 } 4783 4784 /** 4785 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD 4786 * @evt: ibmvfc event struct 4787 * 4788 **/ 4789 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt) 4790 { 4791 struct ibmvfc_host *vhost = evt->vhost; 4792 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets; 4793 u32 mad_status = be16_to_cpu(rsp->common.status); 4794 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4795 4796 switch (mad_status) { 4797 case IBMVFC_MAD_SUCCESS: 4798 ibmvfc_dbg(vhost, "Discover Targets succeeded\n"); 4799 vhost->num_targets = be32_to_cpu(rsp->num_written); 4800 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS); 4801 break; 4802 case IBMVFC_MAD_FAILED: 4803 level += ibmvfc_retry_host_init(vhost); 4804 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n", 4805 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 4806 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)); 4807 break; 4808 case IBMVFC_MAD_DRIVER_FAILED: 4809 break; 4810 default: 4811 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status); 4812 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4813 break; 4814 } 4815 4816 ibmvfc_free_event(evt); 4817 wake_up(&vhost->work_wait_q); 4818 } 4819 4820 /** 4821 * ibmvfc_discover_targets - Send Discover Targets MAD 4822 * @vhost: ibmvfc host struct 4823 * 4824 **/ 4825 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost) 4826 { 4827 struct ibmvfc_discover_targets *mad; 4828 struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq); 4829 4830 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT); 4831 mad = &evt->iu.discover_targets; 4832 memset(mad, 0, sizeof(*mad)); 4833 mad->common.version = cpu_to_be32(1); 4834 mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS); 4835 mad->common.length = cpu_to_be16(sizeof(*mad)); 4836 mad->bufflen = cpu_to_be32(vhost->disc_buf_sz); 4837 mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma); 4838 mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz); 4839 mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST); 4840 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 4841 4842 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 4843 ibmvfc_dbg(vhost, "Sent discover targets\n"); 4844 else 4845 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4846 } 4847 4848 static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt) 4849 { 4850 struct ibmvfc_host *vhost = evt->vhost; 4851 struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf; 4852 struct ibmvfc_scsi_channels *scrqs = &vhost->scsi_scrqs; 4853 u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status); 4854 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4855 int flags, active_queues, i; 4856 4857 ibmvfc_free_event(evt); 4858 4859 switch (mad_status) { 4860 case IBMVFC_MAD_SUCCESS: 4861 ibmvfc_dbg(vhost, "Channel Setup succeeded\n"); 4862 flags = be32_to_cpu(setup->flags); 4863 vhost->do_enquiry = 0; 4864 active_queues = be32_to_cpu(setup->num_scsi_subq_channels); 4865 scrqs->active_queues = active_queues; 4866 4867 if (flags & IBMVFC_CHANNELS_CANCELED) { 4868 ibmvfc_dbg(vhost, "Channels Canceled\n"); 4869 vhost->using_channels = 0; 4870 } else { 4871 if (active_queues) 4872 vhost->using_channels = 1; 4873 for (i = 0; i < active_queues; i++) 4874 scrqs->scrqs[i].vios_cookie = 4875 be64_to_cpu(setup->channel_handles[i]); 4876 4877 ibmvfc_dbg(vhost, "Using %u channels\n", 4878 vhost->scsi_scrqs.active_queues); 4879 } 4880 break; 4881 case IBMVFC_MAD_FAILED: 4882 level += ibmvfc_retry_host_init(vhost); 4883 ibmvfc_log(vhost, level, "Channel Setup failed\n"); 4884 fallthrough; 4885 case IBMVFC_MAD_DRIVER_FAILED: 4886 return; 4887 default: 4888 dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n", 4889 mad_status); 4890 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4891 return; 4892 } 4893 4894 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 4895 wake_up(&vhost->work_wait_q); 4896 } 4897 4898 static void ibmvfc_channel_setup(struct ibmvfc_host *vhost) 4899 { 4900 struct ibmvfc_channel_setup_mad *mad; 4901 struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf; 4902 struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq); 4903 struct ibmvfc_scsi_channels *scrqs = &vhost->scsi_scrqs; 4904 unsigned int num_channels = 4905 min(vhost->client_scsi_channels, vhost->max_vios_scsi_channels); 4906 int i; 4907 4908 memset(setup_buf, 0, sizeof(*setup_buf)); 4909 if (num_channels == 0) 4910 setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS); 4911 else { 4912 setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels); 4913 for (i = 0; i < num_channels; i++) 4914 setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie); 4915 } 4916 4917 ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT); 4918 mad = &evt->iu.channel_setup; 4919 memset(mad, 0, sizeof(*mad)); 4920 mad->common.version = cpu_to_be32(1); 4921 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP); 4922 mad->common.length = cpu_to_be16(sizeof(*mad)); 4923 mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma); 4924 mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf)); 4925 4926 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 4927 4928 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 4929 ibmvfc_dbg(vhost, "Sent channel setup\n"); 4930 else 4931 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 4932 } 4933 4934 static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt) 4935 { 4936 struct ibmvfc_host *vhost = evt->vhost; 4937 struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry; 4938 u32 mad_status = be16_to_cpu(rsp->common.status); 4939 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4940 4941 switch (mad_status) { 4942 case IBMVFC_MAD_SUCCESS: 4943 ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n"); 4944 vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels); 4945 ibmvfc_free_event(evt); 4946 break; 4947 case IBMVFC_MAD_FAILED: 4948 level += ibmvfc_retry_host_init(vhost); 4949 ibmvfc_log(vhost, level, "Channel Enquiry failed\n"); 4950 fallthrough; 4951 case IBMVFC_MAD_DRIVER_FAILED: 4952 ibmvfc_free_event(evt); 4953 return; 4954 default: 4955 dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n", 4956 mad_status); 4957 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4958 ibmvfc_free_event(evt); 4959 return; 4960 } 4961 4962 ibmvfc_channel_setup(vhost); 4963 } 4964 4965 static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost) 4966 { 4967 struct ibmvfc_channel_enquiry *mad; 4968 struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq); 4969 4970 ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT); 4971 mad = &evt->iu.channel_enquiry; 4972 memset(mad, 0, sizeof(*mad)); 4973 mad->common.version = cpu_to_be32(1); 4974 mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY); 4975 mad->common.length = cpu_to_be16(sizeof(*mad)); 4976 4977 if (mig_channels_only) 4978 mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT); 4979 if (mig_no_less_channels) 4980 mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT); 4981 4982 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 4983 4984 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 4985 ibmvfc_dbg(vhost, "Send channel enquiry\n"); 4986 else 4987 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4988 } 4989 4990 /** 4991 * ibmvfc_npiv_login_done - Completion handler for NPIV Login 4992 * @evt: ibmvfc event struct 4993 * 4994 **/ 4995 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt) 4996 { 4997 struct ibmvfc_host *vhost = evt->vhost; 4998 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status); 4999 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp; 5000 unsigned int npiv_max_sectors; 5001 int level = IBMVFC_DEFAULT_LOG_LEVEL; 5002 5003 switch (mad_status) { 5004 case IBMVFC_MAD_SUCCESS: 5005 ibmvfc_free_event(evt); 5006 break; 5007 case IBMVFC_MAD_FAILED: 5008 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error))) 5009 level += ibmvfc_retry_host_init(vhost); 5010 else 5011 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5012 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n", 5013 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), 5014 be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)); 5015 ibmvfc_free_event(evt); 5016 return; 5017 case IBMVFC_MAD_CRQ_ERROR: 5018 ibmvfc_retry_host_init(vhost); 5019 fallthrough; 5020 case IBMVFC_MAD_DRIVER_FAILED: 5021 ibmvfc_free_event(evt); 5022 return; 5023 default: 5024 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status); 5025 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5026 ibmvfc_free_event(evt); 5027 return; 5028 } 5029 5030 vhost->client_migrated = 0; 5031 5032 if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) { 5033 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n", 5034 rsp->flags); 5035 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5036 wake_up(&vhost->work_wait_q); 5037 return; 5038 } 5039 5040 if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) { 5041 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n", 5042 rsp->max_cmds); 5043 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5044 wake_up(&vhost->work_wait_q); 5045 return; 5046 } 5047 5048 vhost->logged_in = 1; 5049 npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS); 5050 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n", 5051 rsp->partition_name, rsp->device_name, rsp->port_loc_code, 5052 rsp->drc_name, npiv_max_sectors); 5053 5054 fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name); 5055 fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name); 5056 fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name); 5057 fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id); 5058 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV; 5059 fc_host_supported_classes(vhost->host) = 0; 5060 if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000) 5061 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1; 5062 if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000) 5063 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2; 5064 if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000) 5065 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3; 5066 fc_host_maxframe_size(vhost->host) = 5067 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff; 5068 5069 vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ; 5070 vhost->host->max_sectors = npiv_max_sectors; 5071 5072 if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) { 5073 ibmvfc_channel_enquiry(vhost); 5074 } else { 5075 vhost->do_enquiry = 0; 5076 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 5077 wake_up(&vhost->work_wait_q); 5078 } 5079 } 5080 5081 /** 5082 * ibmvfc_npiv_login - Sends NPIV login 5083 * @vhost: ibmvfc host struct 5084 * 5085 **/ 5086 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost) 5087 { 5088 struct ibmvfc_npiv_login_mad *mad; 5089 struct ibmvfc_event *evt = ibmvfc_get_event(&vhost->crq); 5090 5091 ibmvfc_gather_partition_info(vhost); 5092 ibmvfc_set_login_info(vhost); 5093 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT); 5094 5095 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info)); 5096 mad = &evt->iu.npiv_login; 5097 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad)); 5098 mad->common.version = cpu_to_be32(1); 5099 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN); 5100 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad)); 5101 mad->buffer.va = cpu_to_be64(vhost->login_buf_dma); 5102 mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf)); 5103 5104 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 5105 5106 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5107 ibmvfc_dbg(vhost, "Sent NPIV login\n"); 5108 else 5109 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5110 } 5111 5112 /** 5113 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout 5114 * @vhost: ibmvfc host struct 5115 * 5116 **/ 5117 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt) 5118 { 5119 struct ibmvfc_host *vhost = evt->vhost; 5120 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status); 5121 5122 ibmvfc_free_event(evt); 5123 5124 switch (mad_status) { 5125 case IBMVFC_MAD_SUCCESS: 5126 if (list_empty(&vhost->crq.sent) && 5127 vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) { 5128 ibmvfc_init_host(vhost); 5129 return; 5130 } 5131 break; 5132 case IBMVFC_MAD_FAILED: 5133 case IBMVFC_MAD_NOT_SUPPORTED: 5134 case IBMVFC_MAD_CRQ_ERROR: 5135 case IBMVFC_MAD_DRIVER_FAILED: 5136 default: 5137 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status); 5138 break; 5139 } 5140 5141 ibmvfc_hard_reset_host(vhost); 5142 } 5143 5144 /** 5145 * ibmvfc_npiv_logout - Issue an NPIV Logout 5146 * @vhost: ibmvfc host struct 5147 * 5148 **/ 5149 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost) 5150 { 5151 struct ibmvfc_npiv_logout_mad *mad; 5152 struct ibmvfc_event *evt; 5153 5154 evt = ibmvfc_get_event(&vhost->crq); 5155 ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT); 5156 5157 mad = &evt->iu.npiv_logout; 5158 memset(mad, 0, sizeof(*mad)); 5159 mad->common.version = cpu_to_be32(1); 5160 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT); 5161 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad)); 5162 5163 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT); 5164 5165 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 5166 ibmvfc_dbg(vhost, "Sent NPIV logout\n"); 5167 else 5168 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5169 } 5170 5171 /** 5172 * ibmvfc_dev_init_to_do - Is there target initialization work to do? 5173 * @vhost: ibmvfc host struct 5174 * 5175 * Returns: 5176 * 1 if work to do / 0 if not 5177 **/ 5178 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost) 5179 { 5180 struct ibmvfc_target *tgt; 5181 5182 list_for_each_entry(tgt, &vhost->targets, queue) { 5183 if (tgt->action == IBMVFC_TGT_ACTION_INIT || 5184 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 5185 return 1; 5186 } 5187 5188 return 0; 5189 } 5190 5191 /** 5192 * ibmvfc_dev_logo_to_do - Is there target logout work to do? 5193 * @vhost: ibmvfc host struct 5194 * 5195 * Returns: 5196 * 1 if work to do / 0 if not 5197 **/ 5198 static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost) 5199 { 5200 struct ibmvfc_target *tgt; 5201 5202 list_for_each_entry(tgt, &vhost->targets, queue) { 5203 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT || 5204 tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT) 5205 return 1; 5206 } 5207 return 0; 5208 } 5209 5210 /** 5211 * __ibmvfc_work_to_do - Is there task level work to do? (no locking) 5212 * @vhost: ibmvfc host struct 5213 * 5214 * Returns: 5215 * 1 if work to do / 0 if not 5216 **/ 5217 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost) 5218 { 5219 struct ibmvfc_target *tgt; 5220 5221 if (kthread_should_stop()) 5222 return 1; 5223 switch (vhost->action) { 5224 case IBMVFC_HOST_ACTION_NONE: 5225 case IBMVFC_HOST_ACTION_INIT_WAIT: 5226 case IBMVFC_HOST_ACTION_LOGO_WAIT: 5227 return 0; 5228 case IBMVFC_HOST_ACTION_TGT_INIT: 5229 case IBMVFC_HOST_ACTION_QUERY_TGTS: 5230 if (vhost->discovery_threads == disc_threads) 5231 return 0; 5232 list_for_each_entry(tgt, &vhost->targets, queue) 5233 if (tgt->action == IBMVFC_TGT_ACTION_INIT) 5234 return 1; 5235 list_for_each_entry(tgt, &vhost->targets, queue) 5236 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 5237 return 0; 5238 return 1; 5239 case IBMVFC_HOST_ACTION_TGT_DEL: 5240 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 5241 if (vhost->discovery_threads == disc_threads) 5242 return 0; 5243 list_for_each_entry(tgt, &vhost->targets, queue) 5244 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) 5245 return 1; 5246 list_for_each_entry(tgt, &vhost->targets, queue) 5247 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT) 5248 return 0; 5249 return 1; 5250 case IBMVFC_HOST_ACTION_LOGO: 5251 case IBMVFC_HOST_ACTION_INIT: 5252 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 5253 case IBMVFC_HOST_ACTION_QUERY: 5254 case IBMVFC_HOST_ACTION_RESET: 5255 case IBMVFC_HOST_ACTION_REENABLE: 5256 default: 5257 break; 5258 } 5259 5260 return 1; 5261 } 5262 5263 /** 5264 * ibmvfc_work_to_do - Is there task level work to do? 5265 * @vhost: ibmvfc host struct 5266 * 5267 * Returns: 5268 * 1 if work to do / 0 if not 5269 **/ 5270 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost) 5271 { 5272 unsigned long flags; 5273 int rc; 5274 5275 spin_lock_irqsave(vhost->host->host_lock, flags); 5276 rc = __ibmvfc_work_to_do(vhost); 5277 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5278 return rc; 5279 } 5280 5281 /** 5282 * ibmvfc_log_ae - Log async events if necessary 5283 * @vhost: ibmvfc host struct 5284 * @events: events to log 5285 * 5286 **/ 5287 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events) 5288 { 5289 if (events & IBMVFC_AE_RSCN) 5290 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0); 5291 if ((events & IBMVFC_AE_LINKDOWN) && 5292 vhost->state >= IBMVFC_HALTED) 5293 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0); 5294 if ((events & IBMVFC_AE_LINKUP) && 5295 vhost->state == IBMVFC_INITIALIZING) 5296 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0); 5297 } 5298 5299 /** 5300 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port 5301 * @tgt: ibmvfc target struct 5302 * 5303 **/ 5304 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt) 5305 { 5306 struct ibmvfc_host *vhost = tgt->vhost; 5307 struct fc_rport *rport; 5308 unsigned long flags; 5309 5310 tgt_dbg(tgt, "Adding rport\n"); 5311 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids); 5312 spin_lock_irqsave(vhost->host->host_lock, flags); 5313 5314 if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { 5315 tgt_dbg(tgt, "Deleting rport\n"); 5316 list_del(&tgt->queue); 5317 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT); 5318 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5319 fc_remote_port_delete(rport); 5320 del_timer_sync(&tgt->timer); 5321 kref_put(&tgt->kref, ibmvfc_release_tgt); 5322 return; 5323 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) { 5324 tgt_dbg(tgt, "Deleting rport with outstanding I/O\n"); 5325 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT); 5326 tgt->rport = NULL; 5327 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5328 fc_remote_port_delete(rport); 5329 return; 5330 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) { 5331 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5332 return; 5333 } 5334 5335 if (rport) { 5336 tgt_dbg(tgt, "rport add succeeded\n"); 5337 tgt->rport = rport; 5338 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff; 5339 rport->supported_classes = 0; 5340 tgt->target_id = rport->scsi_target_id; 5341 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000) 5342 rport->supported_classes |= FC_COS_CLASS1; 5343 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000) 5344 rport->supported_classes |= FC_COS_CLASS2; 5345 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000) 5346 rport->supported_classes |= FC_COS_CLASS3; 5347 if (rport->rqst_q) 5348 blk_queue_max_segments(rport->rqst_q, 1); 5349 } else 5350 tgt_dbg(tgt, "rport add failed\n"); 5351 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5352 } 5353 5354 /** 5355 * ibmvfc_do_work - Do task level work 5356 * @vhost: ibmvfc host struct 5357 * 5358 **/ 5359 static void ibmvfc_do_work(struct ibmvfc_host *vhost) 5360 { 5361 struct ibmvfc_target *tgt; 5362 unsigned long flags; 5363 struct fc_rport *rport; 5364 LIST_HEAD(purge); 5365 int rc; 5366 5367 ibmvfc_log_ae(vhost, vhost->events_to_log); 5368 spin_lock_irqsave(vhost->host->host_lock, flags); 5369 vhost->events_to_log = 0; 5370 switch (vhost->action) { 5371 case IBMVFC_HOST_ACTION_NONE: 5372 case IBMVFC_HOST_ACTION_LOGO_WAIT: 5373 case IBMVFC_HOST_ACTION_INIT_WAIT: 5374 break; 5375 case IBMVFC_HOST_ACTION_RESET: 5376 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL; 5377 list_splice_init(&vhost->purge, &purge); 5378 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5379 ibmvfc_complete_purge(&purge); 5380 rc = ibmvfc_reset_crq(vhost); 5381 spin_lock_irqsave(vhost->host->host_lock, flags); 5382 if (rc == H_CLOSED) 5383 vio_enable_interrupts(to_vio_dev(vhost->dev)); 5384 if (rc || (rc = ibmvfc_send_crq_init(vhost)) || 5385 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) { 5386 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5387 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc); 5388 } 5389 break; 5390 case IBMVFC_HOST_ACTION_REENABLE: 5391 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL; 5392 list_splice_init(&vhost->purge, &purge); 5393 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5394 ibmvfc_complete_purge(&purge); 5395 rc = ibmvfc_reenable_crq_queue(vhost); 5396 spin_lock_irqsave(vhost->host->host_lock, flags); 5397 if (rc || (rc = ibmvfc_send_crq_init(vhost))) { 5398 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 5399 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc); 5400 } 5401 break; 5402 case IBMVFC_HOST_ACTION_LOGO: 5403 vhost->job_step(vhost); 5404 break; 5405 case IBMVFC_HOST_ACTION_INIT: 5406 BUG_ON(vhost->state != IBMVFC_INITIALIZING); 5407 if (vhost->delay_init) { 5408 vhost->delay_init = 0; 5409 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5410 ssleep(15); 5411 return; 5412 } else 5413 vhost->job_step(vhost); 5414 break; 5415 case IBMVFC_HOST_ACTION_QUERY: 5416 list_for_each_entry(tgt, &vhost->targets, queue) 5417 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target); 5418 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS); 5419 break; 5420 case IBMVFC_HOST_ACTION_QUERY_TGTS: 5421 list_for_each_entry(tgt, &vhost->targets, queue) { 5422 if (tgt->action == IBMVFC_TGT_ACTION_INIT) { 5423 tgt->job_step(tgt); 5424 break; 5425 } 5426 } 5427 5428 if (!ibmvfc_dev_init_to_do(vhost)) 5429 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); 5430 break; 5431 case IBMVFC_HOST_ACTION_TGT_DEL: 5432 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 5433 list_for_each_entry(tgt, &vhost->targets, queue) { 5434 if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) { 5435 tgt->job_step(tgt); 5436 break; 5437 } 5438 } 5439 5440 if (ibmvfc_dev_logo_to_do(vhost)) { 5441 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5442 return; 5443 } 5444 5445 list_for_each_entry(tgt, &vhost->targets, queue) { 5446 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { 5447 tgt_dbg(tgt, "Deleting rport\n"); 5448 rport = tgt->rport; 5449 tgt->rport = NULL; 5450 list_del(&tgt->queue); 5451 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT); 5452 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5453 if (rport) 5454 fc_remote_port_delete(rport); 5455 del_timer_sync(&tgt->timer); 5456 kref_put(&tgt->kref, ibmvfc_release_tgt); 5457 return; 5458 } else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) { 5459 tgt_dbg(tgt, "Deleting rport with I/O outstanding\n"); 5460 rport = tgt->rport; 5461 tgt->rport = NULL; 5462 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT); 5463 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5464 if (rport) 5465 fc_remote_port_delete(rport); 5466 return; 5467 } 5468 } 5469 5470 if (vhost->state == IBMVFC_INITIALIZING) { 5471 if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) { 5472 if (vhost->reinit) { 5473 vhost->reinit = 0; 5474 scsi_block_requests(vhost->host); 5475 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 5476 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5477 } else { 5478 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE); 5479 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 5480 wake_up(&vhost->init_wait_q); 5481 schedule_work(&vhost->rport_add_work_q); 5482 vhost->init_retries = 0; 5483 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5484 scsi_unblock_requests(vhost->host); 5485 } 5486 5487 return; 5488 } else { 5489 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 5490 vhost->job_step = ibmvfc_discover_targets; 5491 } 5492 } else { 5493 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 5494 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5495 scsi_unblock_requests(vhost->host); 5496 wake_up(&vhost->init_wait_q); 5497 return; 5498 } 5499 break; 5500 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 5501 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT); 5502 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5503 ibmvfc_alloc_targets(vhost); 5504 spin_lock_irqsave(vhost->host->host_lock, flags); 5505 break; 5506 case IBMVFC_HOST_ACTION_TGT_INIT: 5507 list_for_each_entry(tgt, &vhost->targets, queue) { 5508 if (tgt->action == IBMVFC_TGT_ACTION_INIT) { 5509 tgt->job_step(tgt); 5510 break; 5511 } 5512 } 5513 5514 if (!ibmvfc_dev_init_to_do(vhost)) 5515 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED); 5516 break; 5517 default: 5518 break; 5519 } 5520 5521 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5522 } 5523 5524 /** 5525 * ibmvfc_work - Do task level work 5526 * @data: ibmvfc host struct 5527 * 5528 * Returns: 5529 * zero 5530 **/ 5531 static int ibmvfc_work(void *data) 5532 { 5533 struct ibmvfc_host *vhost = data; 5534 int rc; 5535 5536 set_user_nice(current, MIN_NICE); 5537 5538 while (1) { 5539 rc = wait_event_interruptible(vhost->work_wait_q, 5540 ibmvfc_work_to_do(vhost)); 5541 5542 BUG_ON(rc); 5543 5544 if (kthread_should_stop()) 5545 break; 5546 5547 ibmvfc_do_work(vhost); 5548 } 5549 5550 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n"); 5551 return 0; 5552 } 5553 5554 /** 5555 * ibmvfc_alloc_queue - Allocate queue 5556 * @vhost: ibmvfc host struct 5557 * @queue: ibmvfc queue to allocate 5558 * @fmt: queue format to allocate 5559 * 5560 * Returns: 5561 * 0 on success / non-zero on failure 5562 **/ 5563 static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost, 5564 struct ibmvfc_queue *queue, 5565 enum ibmvfc_msg_fmt fmt) 5566 { 5567 struct device *dev = vhost->dev; 5568 size_t fmt_size; 5569 unsigned int pool_size = 0; 5570 5571 ENTER; 5572 spin_lock_init(&queue->_lock); 5573 queue->q_lock = &queue->_lock; 5574 5575 switch (fmt) { 5576 case IBMVFC_CRQ_FMT: 5577 fmt_size = sizeof(*queue->msgs.crq); 5578 pool_size = max_requests + IBMVFC_NUM_INTERNAL_REQ; 5579 break; 5580 case IBMVFC_ASYNC_FMT: 5581 fmt_size = sizeof(*queue->msgs.async); 5582 break; 5583 case IBMVFC_SUB_CRQ_FMT: 5584 fmt_size = sizeof(*queue->msgs.scrq); 5585 /* We need one extra event for Cancel Commands */ 5586 pool_size = max_requests + 1; 5587 break; 5588 default: 5589 dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt); 5590 return -EINVAL; 5591 } 5592 5593 if (ibmvfc_init_event_pool(vhost, queue, pool_size)) { 5594 dev_err(dev, "Couldn't initialize event pool.\n"); 5595 return -ENOMEM; 5596 } 5597 5598 queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL); 5599 if (!queue->msgs.handle) 5600 return -ENOMEM; 5601 5602 queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE, 5603 DMA_BIDIRECTIONAL); 5604 5605 if (dma_mapping_error(dev, queue->msg_token)) { 5606 free_page((unsigned long)queue->msgs.handle); 5607 queue->msgs.handle = NULL; 5608 return -ENOMEM; 5609 } 5610 5611 queue->cur = 0; 5612 queue->fmt = fmt; 5613 queue->size = PAGE_SIZE / fmt_size; 5614 return 0; 5615 } 5616 5617 /** 5618 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor 5619 * @vhost: ibmvfc host struct 5620 * 5621 * Allocates a page for messages, maps it for dma, and registers 5622 * the crq with the hypervisor. 5623 * 5624 * Return value: 5625 * zero on success / other on failure 5626 **/ 5627 static int ibmvfc_init_crq(struct ibmvfc_host *vhost) 5628 { 5629 int rc, retrc = -ENOMEM; 5630 struct device *dev = vhost->dev; 5631 struct vio_dev *vdev = to_vio_dev(dev); 5632 struct ibmvfc_queue *crq = &vhost->crq; 5633 5634 ENTER; 5635 if (ibmvfc_alloc_queue(vhost, crq, IBMVFC_CRQ_FMT)) 5636 return -ENOMEM; 5637 5638 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 5639 crq->msg_token, PAGE_SIZE); 5640 5641 if (rc == H_RESOURCE) 5642 /* maybe kexecing and resource is busy. try a reset */ 5643 retrc = rc = ibmvfc_reset_crq(vhost); 5644 5645 if (rc == H_CLOSED) 5646 dev_warn(dev, "Partner adapter not ready\n"); 5647 else if (rc) { 5648 dev_warn(dev, "Error %d opening adapter\n", rc); 5649 goto reg_crq_failed; 5650 } 5651 5652 retrc = 0; 5653 5654 tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost); 5655 5656 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) { 5657 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc); 5658 goto req_irq_failed; 5659 } 5660 5661 if ((rc = vio_enable_interrupts(vdev))) { 5662 dev_err(dev, "Error %d enabling interrupts\n", rc); 5663 goto req_irq_failed; 5664 } 5665 5666 LEAVE; 5667 return retrc; 5668 5669 req_irq_failed: 5670 tasklet_kill(&vhost->tasklet); 5671 do { 5672 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 5673 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 5674 reg_crq_failed: 5675 ibmvfc_free_queue(vhost, crq); 5676 return retrc; 5677 } 5678 5679 static int ibmvfc_register_scsi_channel(struct ibmvfc_host *vhost, 5680 int index) 5681 { 5682 struct device *dev = vhost->dev; 5683 struct vio_dev *vdev = to_vio_dev(dev); 5684 struct ibmvfc_queue *scrq = &vhost->scsi_scrqs.scrqs[index]; 5685 int rc = -ENOMEM; 5686 5687 ENTER; 5688 5689 if (ibmvfc_alloc_queue(vhost, scrq, IBMVFC_SUB_CRQ_FMT)) 5690 return -ENOMEM; 5691 5692 rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE, 5693 &scrq->cookie, &scrq->hw_irq); 5694 5695 /* H_CLOSED indicates successful register, but no CRQ partner */ 5696 if (rc && rc != H_CLOSED) { 5697 dev_warn(dev, "Error registering sub-crq: %d\n", rc); 5698 if (rc == H_PARAMETER) 5699 dev_warn_once(dev, "Firmware may not support MQ\n"); 5700 goto reg_failed; 5701 } 5702 5703 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq); 5704 5705 if (!scrq->irq) { 5706 rc = -EINVAL; 5707 dev_err(dev, "Error mapping sub-crq[%d] irq\n", index); 5708 goto irq_failed; 5709 } 5710 5711 snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d", 5712 vdev->unit_address, index); 5713 rc = request_irq(scrq->irq, ibmvfc_interrupt_scsi, 0, scrq->name, scrq); 5714 5715 if (rc) { 5716 dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index); 5717 irq_dispose_mapping(scrq->irq); 5718 goto irq_failed; 5719 } 5720 5721 scrq->hwq_id = index; 5722 scrq->vhost = vhost; 5723 5724 LEAVE; 5725 return 0; 5726 5727 irq_failed: 5728 do { 5729 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie); 5730 } while (rtas_busy_delay(rc)); 5731 reg_failed: 5732 ibmvfc_free_queue(vhost, scrq); 5733 LEAVE; 5734 return rc; 5735 } 5736 5737 static void ibmvfc_deregister_scsi_channel(struct ibmvfc_host *vhost, int index) 5738 { 5739 struct device *dev = vhost->dev; 5740 struct vio_dev *vdev = to_vio_dev(dev); 5741 struct ibmvfc_queue *scrq = &vhost->scsi_scrqs.scrqs[index]; 5742 long rc; 5743 5744 ENTER; 5745 5746 free_irq(scrq->irq, scrq); 5747 irq_dispose_mapping(scrq->irq); 5748 scrq->irq = 0; 5749 5750 do { 5751 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, 5752 scrq->cookie); 5753 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 5754 5755 if (rc) 5756 dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc); 5757 5758 ibmvfc_free_queue(vhost, scrq); 5759 LEAVE; 5760 } 5761 5762 static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost) 5763 { 5764 int i, j; 5765 5766 ENTER; 5767 if (!vhost->mq_enabled) 5768 return; 5769 5770 vhost->scsi_scrqs.scrqs = kcalloc(nr_scsi_hw_queues, 5771 sizeof(*vhost->scsi_scrqs.scrqs), 5772 GFP_KERNEL); 5773 if (!vhost->scsi_scrqs.scrqs) { 5774 vhost->do_enquiry = 0; 5775 return; 5776 } 5777 5778 for (i = 0; i < nr_scsi_hw_queues; i++) { 5779 if (ibmvfc_register_scsi_channel(vhost, i)) { 5780 for (j = i; j > 0; j--) 5781 ibmvfc_deregister_scsi_channel(vhost, j - 1); 5782 kfree(vhost->scsi_scrqs.scrqs); 5783 vhost->scsi_scrqs.scrqs = NULL; 5784 vhost->scsi_scrqs.active_queues = 0; 5785 vhost->do_enquiry = 0; 5786 break; 5787 } 5788 } 5789 5790 LEAVE; 5791 } 5792 5793 static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost) 5794 { 5795 int i; 5796 5797 ENTER; 5798 if (!vhost->scsi_scrqs.scrqs) 5799 return; 5800 5801 for (i = 0; i < nr_scsi_hw_queues; i++) 5802 ibmvfc_deregister_scsi_channel(vhost, i); 5803 5804 kfree(vhost->scsi_scrqs.scrqs); 5805 vhost->scsi_scrqs.scrqs = NULL; 5806 vhost->scsi_scrqs.active_queues = 0; 5807 LEAVE; 5808 } 5809 5810 /** 5811 * ibmvfc_free_mem - Free memory for vhost 5812 * @vhost: ibmvfc host struct 5813 * 5814 * Return value: 5815 * none 5816 **/ 5817 static void ibmvfc_free_mem(struct ibmvfc_host *vhost) 5818 { 5819 struct ibmvfc_queue *async_q = &vhost->async_crq; 5820 5821 ENTER; 5822 mempool_destroy(vhost->tgt_pool); 5823 kfree(vhost->trace); 5824 dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf, 5825 vhost->disc_buf_dma); 5826 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf), 5827 vhost->login_buf, vhost->login_buf_dma); 5828 dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf), 5829 vhost->channel_setup_buf, vhost->channel_setup_dma); 5830 dma_pool_destroy(vhost->sg_pool); 5831 ibmvfc_free_queue(vhost, async_q); 5832 LEAVE; 5833 } 5834 5835 /** 5836 * ibmvfc_alloc_mem - Allocate memory for vhost 5837 * @vhost: ibmvfc host struct 5838 * 5839 * Return value: 5840 * 0 on success / non-zero on failure 5841 **/ 5842 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost) 5843 { 5844 struct ibmvfc_queue *async_q = &vhost->async_crq; 5845 struct device *dev = vhost->dev; 5846 5847 ENTER; 5848 if (ibmvfc_alloc_queue(vhost, async_q, IBMVFC_ASYNC_FMT)) { 5849 dev_err(dev, "Couldn't allocate/map async queue.\n"); 5850 goto nomem; 5851 } 5852 5853 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev, 5854 SG_ALL * sizeof(struct srp_direct_buf), 5855 sizeof(struct srp_direct_buf), 0); 5856 5857 if (!vhost->sg_pool) { 5858 dev_err(dev, "Failed to allocate sg pool\n"); 5859 goto unmap_async_crq; 5860 } 5861 5862 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf), 5863 &vhost->login_buf_dma, GFP_KERNEL); 5864 5865 if (!vhost->login_buf) { 5866 dev_err(dev, "Couldn't allocate NPIV login buffer\n"); 5867 goto free_sg_pool; 5868 } 5869 5870 vhost->disc_buf_sz = sizeof(*vhost->disc_buf) * max_targets; 5871 vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz, 5872 &vhost->disc_buf_dma, GFP_KERNEL); 5873 5874 if (!vhost->disc_buf) { 5875 dev_err(dev, "Couldn't allocate Discover Targets buffer\n"); 5876 goto free_login_buffer; 5877 } 5878 5879 vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES, 5880 sizeof(struct ibmvfc_trace_entry), GFP_KERNEL); 5881 atomic_set(&vhost->trace_index, -1); 5882 5883 if (!vhost->trace) 5884 goto free_disc_buffer; 5885 5886 vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ, 5887 sizeof(struct ibmvfc_target)); 5888 5889 if (!vhost->tgt_pool) { 5890 dev_err(dev, "Couldn't allocate target memory pool\n"); 5891 goto free_trace; 5892 } 5893 5894 vhost->channel_setup_buf = dma_alloc_coherent(dev, sizeof(*vhost->channel_setup_buf), 5895 &vhost->channel_setup_dma, 5896 GFP_KERNEL); 5897 5898 if (!vhost->channel_setup_buf) { 5899 dev_err(dev, "Couldn't allocate Channel Setup buffer\n"); 5900 goto free_tgt_pool; 5901 } 5902 5903 LEAVE; 5904 return 0; 5905 5906 free_tgt_pool: 5907 mempool_destroy(vhost->tgt_pool); 5908 free_trace: 5909 kfree(vhost->trace); 5910 free_disc_buffer: 5911 dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf, 5912 vhost->disc_buf_dma); 5913 free_login_buffer: 5914 dma_free_coherent(dev, sizeof(*vhost->login_buf), 5915 vhost->login_buf, vhost->login_buf_dma); 5916 free_sg_pool: 5917 dma_pool_destroy(vhost->sg_pool); 5918 unmap_async_crq: 5919 ibmvfc_free_queue(vhost, async_q); 5920 nomem: 5921 LEAVE; 5922 return -ENOMEM; 5923 } 5924 5925 /** 5926 * ibmvfc_rport_add_thread - Worker thread for rport adds 5927 * @work: work struct 5928 * 5929 **/ 5930 static void ibmvfc_rport_add_thread(struct work_struct *work) 5931 { 5932 struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host, 5933 rport_add_work_q); 5934 struct ibmvfc_target *tgt; 5935 struct fc_rport *rport; 5936 unsigned long flags; 5937 int did_work; 5938 5939 ENTER; 5940 spin_lock_irqsave(vhost->host->host_lock, flags); 5941 do { 5942 did_work = 0; 5943 if (vhost->state != IBMVFC_ACTIVE) 5944 break; 5945 5946 list_for_each_entry(tgt, &vhost->targets, queue) { 5947 if (tgt->add_rport) { 5948 did_work = 1; 5949 tgt->add_rport = 0; 5950 kref_get(&tgt->kref); 5951 rport = tgt->rport; 5952 if (!rport) { 5953 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5954 ibmvfc_tgt_add_rport(tgt); 5955 } else if (get_device(&rport->dev)) { 5956 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5957 tgt_dbg(tgt, "Setting rport roles\n"); 5958 fc_remote_port_rolechg(rport, tgt->ids.roles); 5959 put_device(&rport->dev); 5960 } else { 5961 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5962 } 5963 5964 kref_put(&tgt->kref, ibmvfc_release_tgt); 5965 spin_lock_irqsave(vhost->host->host_lock, flags); 5966 break; 5967 } 5968 } 5969 } while(did_work); 5970 5971 if (vhost->state == IBMVFC_ACTIVE) 5972 vhost->scan_complete = 1; 5973 spin_unlock_irqrestore(vhost->host->host_lock, flags); 5974 LEAVE; 5975 } 5976 5977 /** 5978 * ibmvfc_probe - Adapter hot plug add entry point 5979 * @vdev: vio device struct 5980 * @id: vio device id struct 5981 * 5982 * Return value: 5983 * 0 on success / non-zero on failure 5984 **/ 5985 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id) 5986 { 5987 struct ibmvfc_host *vhost; 5988 struct Scsi_Host *shost; 5989 struct device *dev = &vdev->dev; 5990 int rc = -ENOMEM; 5991 unsigned int max_scsi_queues = IBMVFC_MAX_SCSI_QUEUES; 5992 5993 ENTER; 5994 shost = scsi_host_alloc(&driver_template, sizeof(*vhost)); 5995 if (!shost) { 5996 dev_err(dev, "Couldn't allocate host data\n"); 5997 goto out; 5998 } 5999 6000 shost->transportt = ibmvfc_transport_template; 6001 shost->can_queue = max_requests; 6002 shost->max_lun = max_lun; 6003 shost->max_id = max_targets; 6004 shost->max_sectors = IBMVFC_MAX_SECTORS; 6005 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN; 6006 shost->unique_id = shost->host_no; 6007 shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1; 6008 6009 vhost = shost_priv(shost); 6010 INIT_LIST_HEAD(&vhost->targets); 6011 INIT_LIST_HEAD(&vhost->purge); 6012 sprintf(vhost->name, IBMVFC_NAME); 6013 vhost->host = shost; 6014 vhost->dev = dev; 6015 vhost->partition_number = -1; 6016 vhost->log_level = log_level; 6017 vhost->task_set = 1; 6018 6019 vhost->mq_enabled = mq_enabled; 6020 vhost->client_scsi_channels = min(shost->nr_hw_queues, nr_scsi_channels); 6021 vhost->using_channels = 0; 6022 vhost->do_enquiry = 1; 6023 6024 strcpy(vhost->partition_name, "UNKNOWN"); 6025 init_waitqueue_head(&vhost->work_wait_q); 6026 init_waitqueue_head(&vhost->init_wait_q); 6027 INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread); 6028 mutex_init(&vhost->passthru_mutex); 6029 6030 if ((rc = ibmvfc_alloc_mem(vhost))) 6031 goto free_scsi_host; 6032 6033 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME, 6034 shost->host_no); 6035 6036 if (IS_ERR(vhost->work_thread)) { 6037 dev_err(dev, "Couldn't create kernel thread: %ld\n", 6038 PTR_ERR(vhost->work_thread)); 6039 rc = PTR_ERR(vhost->work_thread); 6040 goto free_host_mem; 6041 } 6042 6043 if ((rc = ibmvfc_init_crq(vhost))) { 6044 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc); 6045 goto kill_kthread; 6046 } 6047 6048 if ((rc = scsi_add_host(shost, dev))) 6049 goto release_crq; 6050 6051 fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO; 6052 6053 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj, 6054 &ibmvfc_trace_attr))) { 6055 dev_err(dev, "Failed to create trace file. rc=%d\n", rc); 6056 goto remove_shost; 6057 } 6058 6059 ibmvfc_init_sub_crqs(vhost); 6060 6061 if (shost_to_fc_host(shost)->rqst_q) 6062 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1); 6063 dev_set_drvdata(dev, vhost); 6064 spin_lock(&ibmvfc_driver_lock); 6065 list_add_tail(&vhost->queue, &ibmvfc_head); 6066 spin_unlock(&ibmvfc_driver_lock); 6067 6068 ibmvfc_send_crq_init(vhost); 6069 scsi_scan_host(shost); 6070 return 0; 6071 6072 remove_shost: 6073 scsi_remove_host(shost); 6074 release_crq: 6075 ibmvfc_release_crq_queue(vhost); 6076 kill_kthread: 6077 kthread_stop(vhost->work_thread); 6078 free_host_mem: 6079 ibmvfc_free_mem(vhost); 6080 free_scsi_host: 6081 scsi_host_put(shost); 6082 out: 6083 LEAVE; 6084 return rc; 6085 } 6086 6087 /** 6088 * ibmvfc_remove - Adapter hot plug remove entry point 6089 * @vdev: vio device struct 6090 * 6091 * Return value: 6092 * 0 6093 **/ 6094 static void ibmvfc_remove(struct vio_dev *vdev) 6095 { 6096 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev); 6097 LIST_HEAD(purge); 6098 unsigned long flags; 6099 6100 ENTER; 6101 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr); 6102 6103 spin_lock_irqsave(vhost->host->host_lock, flags); 6104 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 6105 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6106 6107 ibmvfc_wait_while_resetting(vhost); 6108 kthread_stop(vhost->work_thread); 6109 fc_remove_host(vhost->host); 6110 scsi_remove_host(vhost->host); 6111 6112 spin_lock_irqsave(vhost->host->host_lock, flags); 6113 ibmvfc_purge_requests(vhost, DID_ERROR); 6114 list_splice_init(&vhost->purge, &purge); 6115 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6116 ibmvfc_complete_purge(&purge); 6117 ibmvfc_release_sub_crqs(vhost); 6118 ibmvfc_release_crq_queue(vhost); 6119 6120 ibmvfc_free_mem(vhost); 6121 spin_lock(&ibmvfc_driver_lock); 6122 list_del(&vhost->queue); 6123 spin_unlock(&ibmvfc_driver_lock); 6124 scsi_host_put(vhost->host); 6125 LEAVE; 6126 } 6127 6128 /** 6129 * ibmvfc_resume - Resume from suspend 6130 * @dev: device struct 6131 * 6132 * We may have lost an interrupt across suspend/resume, so kick the 6133 * interrupt handler 6134 * 6135 */ 6136 static int ibmvfc_resume(struct device *dev) 6137 { 6138 unsigned long flags; 6139 struct ibmvfc_host *vhost = dev_get_drvdata(dev); 6140 struct vio_dev *vdev = to_vio_dev(dev); 6141 6142 spin_lock_irqsave(vhost->host->host_lock, flags); 6143 vio_disable_interrupts(vdev); 6144 tasklet_schedule(&vhost->tasklet); 6145 spin_unlock_irqrestore(vhost->host->host_lock, flags); 6146 return 0; 6147 } 6148 6149 /** 6150 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver 6151 * @vdev: vio device struct 6152 * 6153 * Return value: 6154 * Number of bytes the driver will need to DMA map at the same time in 6155 * order to perform well. 6156 */ 6157 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev) 6158 { 6159 unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu); 6160 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun); 6161 } 6162 6163 static const struct vio_device_id ibmvfc_device_table[] = { 6164 {"fcp", "IBM,vfc-client"}, 6165 { "", "" } 6166 }; 6167 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table); 6168 6169 static const struct dev_pm_ops ibmvfc_pm_ops = { 6170 .resume = ibmvfc_resume 6171 }; 6172 6173 static struct vio_driver ibmvfc_driver = { 6174 .id_table = ibmvfc_device_table, 6175 .probe = ibmvfc_probe, 6176 .remove = ibmvfc_remove, 6177 .get_desired_dma = ibmvfc_get_desired_dma, 6178 .name = IBMVFC_NAME, 6179 .pm = &ibmvfc_pm_ops, 6180 }; 6181 6182 static struct fc_function_template ibmvfc_transport_functions = { 6183 .show_host_fabric_name = 1, 6184 .show_host_node_name = 1, 6185 .show_host_port_name = 1, 6186 .show_host_supported_classes = 1, 6187 .show_host_port_type = 1, 6188 .show_host_port_id = 1, 6189 .show_host_maxframe_size = 1, 6190 6191 .get_host_port_state = ibmvfc_get_host_port_state, 6192 .show_host_port_state = 1, 6193 6194 .get_host_speed = ibmvfc_get_host_speed, 6195 .show_host_speed = 1, 6196 6197 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip, 6198 .terminate_rport_io = ibmvfc_terminate_rport_io, 6199 6200 .show_rport_maxframe_size = 1, 6201 .show_rport_supported_classes = 1, 6202 6203 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo, 6204 .show_rport_dev_loss_tmo = 1, 6205 6206 .get_starget_node_name = ibmvfc_get_starget_node_name, 6207 .show_starget_node_name = 1, 6208 6209 .get_starget_port_name = ibmvfc_get_starget_port_name, 6210 .show_starget_port_name = 1, 6211 6212 .get_starget_port_id = ibmvfc_get_starget_port_id, 6213 .show_starget_port_id = 1, 6214 6215 .bsg_request = ibmvfc_bsg_request, 6216 .bsg_timeout = ibmvfc_bsg_timeout, 6217 }; 6218 6219 /** 6220 * ibmvfc_module_init - Initialize the ibmvfc module 6221 * 6222 * Return value: 6223 * 0 on success / other on failure 6224 **/ 6225 static int __init ibmvfc_module_init(void) 6226 { 6227 int rc; 6228 6229 if (!firmware_has_feature(FW_FEATURE_VIO)) 6230 return -ENODEV; 6231 6232 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n", 6233 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE); 6234 6235 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions); 6236 if (!ibmvfc_transport_template) 6237 return -ENOMEM; 6238 6239 rc = vio_register_driver(&ibmvfc_driver); 6240 if (rc) 6241 fc_release_transport(ibmvfc_transport_template); 6242 return rc; 6243 } 6244 6245 /** 6246 * ibmvfc_module_exit - Teardown the ibmvfc module 6247 * 6248 * Return value: 6249 * nothing 6250 **/ 6251 static void __exit ibmvfc_module_exit(void) 6252 { 6253 vio_unregister_driver(&ibmvfc_driver); 6254 fc_release_transport(ibmvfc_transport_template); 6255 } 6256 6257 module_init(ibmvfc_module_init); 6258 module_exit(ibmvfc_module_exit); 6259