1 /* 2 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter 3 * 4 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation 5 * 6 * Copyright (C) IBM Corporation, 2008 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 */ 23 24 #include <linux/module.h> 25 #include <linux/moduleparam.h> 26 #include <linux/dma-mapping.h> 27 #include <linux/dmapool.h> 28 #include <linux/delay.h> 29 #include <linux/interrupt.h> 30 #include <linux/kthread.h> 31 #include <linux/slab.h> 32 #include <linux/of.h> 33 #include <linux/pm.h> 34 #include <linux/stringify.h> 35 #include <asm/firmware.h> 36 #include <asm/irq.h> 37 #include <asm/vio.h> 38 #include <scsi/scsi.h> 39 #include <scsi/scsi_cmnd.h> 40 #include <scsi/scsi_host.h> 41 #include <scsi/scsi_device.h> 42 #include <scsi/scsi_tcq.h> 43 #include <scsi/scsi_transport_fc.h> 44 #include <scsi/scsi_bsg_fc.h> 45 #include "ibmvfc.h" 46 47 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT; 48 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT; 49 static unsigned int max_lun = IBMVFC_MAX_LUN; 50 static unsigned int max_targets = IBMVFC_MAX_TARGETS; 51 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT; 52 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS; 53 static unsigned int ibmvfc_debug = IBMVFC_DEBUG; 54 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL; 55 static LIST_HEAD(ibmvfc_head); 56 static DEFINE_SPINLOCK(ibmvfc_driver_lock); 57 static struct scsi_transport_template *ibmvfc_transport_template; 58 59 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver"); 60 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>"); 61 MODULE_LICENSE("GPL"); 62 MODULE_VERSION(IBMVFC_DRIVER_VERSION); 63 64 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR); 65 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. " 66 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]"); 67 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR); 68 MODULE_PARM_DESC(default_timeout, 69 "Default timeout in seconds for initialization and EH commands. " 70 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]"); 71 module_param_named(max_requests, max_requests, uint, S_IRUGO); 72 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. " 73 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]"); 74 module_param_named(max_lun, max_lun, uint, S_IRUGO); 75 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. " 76 "[Default=" __stringify(IBMVFC_MAX_LUN) "]"); 77 module_param_named(max_targets, max_targets, uint, S_IRUGO); 78 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. " 79 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]"); 80 module_param_named(disc_threads, disc_threads, uint, S_IRUGO); 81 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. " 82 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]"); 83 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR); 84 MODULE_PARM_DESC(debug, "Enable driver debug information. " 85 "[Default=" __stringify(IBMVFC_DEBUG) "]"); 86 module_param_named(log_level, log_level, uint, 0); 87 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. " 88 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]"); 89 90 static const struct { 91 u16 status; 92 u16 error; 93 u8 result; 94 u8 retry; 95 int log; 96 char *name; 97 } cmd_status [] = { 98 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" }, 99 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" }, 100 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" }, 101 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" }, 102 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" }, 103 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" }, 104 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" }, 105 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" }, 106 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" }, 107 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" }, 108 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" }, 109 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" }, 110 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" }, 111 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" }, 112 113 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" }, 114 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" }, 115 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" }, 116 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" }, 117 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" }, 118 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" }, 119 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" }, 120 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" }, 121 { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" }, 122 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" }, 123 124 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" }, 125 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" }, 126 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" }, 127 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" }, 128 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" }, 129 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" }, 130 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" }, 131 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" }, 132 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" }, 133 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" }, 134 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" }, 135 136 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" }, 137 }; 138 139 static void ibmvfc_npiv_login(struct ibmvfc_host *); 140 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *); 141 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *); 142 static void ibmvfc_tgt_query_target(struct ibmvfc_target *); 143 static void ibmvfc_npiv_logout(struct ibmvfc_host *); 144 145 static const char *unknown_error = "unknown error"; 146 147 #ifdef CONFIG_SCSI_IBMVFC_TRACE 148 /** 149 * ibmvfc_trc_start - Log a start trace entry 150 * @evt: ibmvfc event struct 151 * 152 **/ 153 static void ibmvfc_trc_start(struct ibmvfc_event *evt) 154 { 155 struct ibmvfc_host *vhost = evt->vhost; 156 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd; 157 struct ibmvfc_mad_common *mad = &evt->iu.mad_common; 158 struct ibmvfc_trace_entry *entry; 159 160 entry = &vhost->trace[vhost->trace_index++]; 161 entry->evt = evt; 162 entry->time = jiffies; 163 entry->fmt = evt->crq.format; 164 entry->type = IBMVFC_TRC_START; 165 166 switch (entry->fmt) { 167 case IBMVFC_CMD_FORMAT: 168 entry->op_code = vfc_cmd->iu.cdb[0]; 169 entry->scsi_id = vfc_cmd->tgt_scsi_id; 170 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun); 171 entry->tmf_flags = vfc_cmd->iu.tmf_flags; 172 entry->u.start.xfer_len = vfc_cmd->iu.xfer_len; 173 break; 174 case IBMVFC_MAD_FORMAT: 175 entry->op_code = mad->opcode; 176 break; 177 default: 178 break; 179 }; 180 } 181 182 /** 183 * ibmvfc_trc_end - Log an end trace entry 184 * @evt: ibmvfc event struct 185 * 186 **/ 187 static void ibmvfc_trc_end(struct ibmvfc_event *evt) 188 { 189 struct ibmvfc_host *vhost = evt->vhost; 190 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 191 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common; 192 struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++]; 193 194 entry->evt = evt; 195 entry->time = jiffies; 196 entry->fmt = evt->crq.format; 197 entry->type = IBMVFC_TRC_END; 198 199 switch (entry->fmt) { 200 case IBMVFC_CMD_FORMAT: 201 entry->op_code = vfc_cmd->iu.cdb[0]; 202 entry->scsi_id = vfc_cmd->tgt_scsi_id; 203 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun); 204 entry->tmf_flags = vfc_cmd->iu.tmf_flags; 205 entry->u.end.status = vfc_cmd->status; 206 entry->u.end.error = vfc_cmd->error; 207 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags; 208 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code; 209 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status; 210 break; 211 case IBMVFC_MAD_FORMAT: 212 entry->op_code = mad->opcode; 213 entry->u.end.status = mad->status; 214 break; 215 default: 216 break; 217 218 }; 219 } 220 221 #else 222 #define ibmvfc_trc_start(evt) do { } while (0) 223 #define ibmvfc_trc_end(evt) do { } while (0) 224 #endif 225 226 /** 227 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response 228 * @status: status / error class 229 * @error: error 230 * 231 * Return value: 232 * index into cmd_status / -EINVAL on failure 233 **/ 234 static int ibmvfc_get_err_index(u16 status, u16 error) 235 { 236 int i; 237 238 for (i = 0; i < ARRAY_SIZE(cmd_status); i++) 239 if ((cmd_status[i].status & status) == cmd_status[i].status && 240 cmd_status[i].error == error) 241 return i; 242 243 return -EINVAL; 244 } 245 246 /** 247 * ibmvfc_get_cmd_error - Find the error description for the fcp response 248 * @status: status / error class 249 * @error: error 250 * 251 * Return value: 252 * error description string 253 **/ 254 static const char *ibmvfc_get_cmd_error(u16 status, u16 error) 255 { 256 int rc = ibmvfc_get_err_index(status, error); 257 if (rc >= 0) 258 return cmd_status[rc].name; 259 return unknown_error; 260 } 261 262 /** 263 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response 264 * @vfc_cmd: ibmvfc command struct 265 * 266 * Return value: 267 * SCSI result value to return for completed command 268 **/ 269 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd) 270 { 271 int err; 272 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; 273 int fc_rsp_len = rsp->fcp_rsp_len; 274 275 if ((rsp->flags & FCP_RSP_LEN_VALID) && 276 ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) || 277 rsp->data.info.rsp_code)) 278 return DID_ERROR << 16; 279 280 err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error); 281 if (err >= 0) 282 return rsp->scsi_status | (cmd_status[err].result << 16); 283 return rsp->scsi_status | (DID_ERROR << 16); 284 } 285 286 /** 287 * ibmvfc_retry_cmd - Determine if error status is retryable 288 * @status: status / error class 289 * @error: error 290 * 291 * Return value: 292 * 1 if error should be retried / 0 if it should not 293 **/ 294 static int ibmvfc_retry_cmd(u16 status, u16 error) 295 { 296 int rc = ibmvfc_get_err_index(status, error); 297 298 if (rc >= 0) 299 return cmd_status[rc].retry; 300 return 1; 301 } 302 303 static const char *unknown_fc_explain = "unknown fc explain"; 304 305 static const struct { 306 u16 fc_explain; 307 char *name; 308 } ls_explain [] = { 309 { 0x00, "no additional explanation" }, 310 { 0x01, "service parameter error - options" }, 311 { 0x03, "service parameter error - initiator control" }, 312 { 0x05, "service parameter error - recipient control" }, 313 { 0x07, "service parameter error - received data field size" }, 314 { 0x09, "service parameter error - concurrent seq" }, 315 { 0x0B, "service parameter error - credit" }, 316 { 0x0D, "invalid N_Port/F_Port_Name" }, 317 { 0x0E, "invalid node/Fabric Name" }, 318 { 0x0F, "invalid common service parameters" }, 319 { 0x11, "invalid association header" }, 320 { 0x13, "association header required" }, 321 { 0x15, "invalid originator S_ID" }, 322 { 0x17, "invalid OX_ID-RX-ID combination" }, 323 { 0x19, "command (request) already in progress" }, 324 { 0x1E, "N_Port Login requested" }, 325 { 0x1F, "Invalid N_Port_ID" }, 326 }; 327 328 static const struct { 329 u16 fc_explain; 330 char *name; 331 } gs_explain [] = { 332 { 0x00, "no additional explanation" }, 333 { 0x01, "port identifier not registered" }, 334 { 0x02, "port name not registered" }, 335 { 0x03, "node name not registered" }, 336 { 0x04, "class of service not registered" }, 337 { 0x06, "initial process associator not registered" }, 338 { 0x07, "FC-4 TYPEs not registered" }, 339 { 0x08, "symbolic port name not registered" }, 340 { 0x09, "symbolic node name not registered" }, 341 { 0x0A, "port type not registered" }, 342 { 0xF0, "authorization exception" }, 343 { 0xF1, "authentication exception" }, 344 { 0xF2, "data base full" }, 345 { 0xF3, "data base empty" }, 346 { 0xF4, "processing request" }, 347 { 0xF5, "unable to verify connection" }, 348 { 0xF6, "devices not in a common zone" }, 349 }; 350 351 /** 352 * ibmvfc_get_ls_explain - Return the FC Explain description text 353 * @status: FC Explain status 354 * 355 * Returns: 356 * error string 357 **/ 358 static const char *ibmvfc_get_ls_explain(u16 status) 359 { 360 int i; 361 362 for (i = 0; i < ARRAY_SIZE(ls_explain); i++) 363 if (ls_explain[i].fc_explain == status) 364 return ls_explain[i].name; 365 366 return unknown_fc_explain; 367 } 368 369 /** 370 * ibmvfc_get_gs_explain - Return the FC Explain description text 371 * @status: FC Explain status 372 * 373 * Returns: 374 * error string 375 **/ 376 static const char *ibmvfc_get_gs_explain(u16 status) 377 { 378 int i; 379 380 for (i = 0; i < ARRAY_SIZE(gs_explain); i++) 381 if (gs_explain[i].fc_explain == status) 382 return gs_explain[i].name; 383 384 return unknown_fc_explain; 385 } 386 387 static const struct { 388 enum ibmvfc_fc_type fc_type; 389 char *name; 390 } fc_type [] = { 391 { IBMVFC_FABRIC_REJECT, "fabric reject" }, 392 { IBMVFC_PORT_REJECT, "port reject" }, 393 { IBMVFC_LS_REJECT, "ELS reject" }, 394 { IBMVFC_FABRIC_BUSY, "fabric busy" }, 395 { IBMVFC_PORT_BUSY, "port busy" }, 396 { IBMVFC_BASIC_REJECT, "basic reject" }, 397 }; 398 399 static const char *unknown_fc_type = "unknown fc type"; 400 401 /** 402 * ibmvfc_get_fc_type - Return the FC Type description text 403 * @status: FC Type error status 404 * 405 * Returns: 406 * error string 407 **/ 408 static const char *ibmvfc_get_fc_type(u16 status) 409 { 410 int i; 411 412 for (i = 0; i < ARRAY_SIZE(fc_type); i++) 413 if (fc_type[i].fc_type == status) 414 return fc_type[i].name; 415 416 return unknown_fc_type; 417 } 418 419 /** 420 * ibmvfc_set_tgt_action - Set the next init action for the target 421 * @tgt: ibmvfc target struct 422 * @action: action to perform 423 * 424 **/ 425 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt, 426 enum ibmvfc_target_action action) 427 { 428 switch (tgt->action) { 429 case IBMVFC_TGT_ACTION_DEL_RPORT: 430 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) 431 tgt->action = action; 432 case IBMVFC_TGT_ACTION_DELETED_RPORT: 433 break; 434 default: 435 if (action == IBMVFC_TGT_ACTION_DEL_RPORT) 436 tgt->add_rport = 0; 437 tgt->action = action; 438 break; 439 } 440 } 441 442 /** 443 * ibmvfc_set_host_state - Set the state for the host 444 * @vhost: ibmvfc host struct 445 * @state: state to set host to 446 * 447 * Returns: 448 * 0 if state changed / non-zero if not changed 449 **/ 450 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost, 451 enum ibmvfc_host_state state) 452 { 453 int rc = 0; 454 455 switch (vhost->state) { 456 case IBMVFC_HOST_OFFLINE: 457 rc = -EINVAL; 458 break; 459 default: 460 vhost->state = state; 461 break; 462 }; 463 464 return rc; 465 } 466 467 /** 468 * ibmvfc_set_host_action - Set the next init action for the host 469 * @vhost: ibmvfc host struct 470 * @action: action to perform 471 * 472 **/ 473 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost, 474 enum ibmvfc_host_action action) 475 { 476 switch (action) { 477 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 478 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) 479 vhost->action = action; 480 break; 481 case IBMVFC_HOST_ACTION_LOGO_WAIT: 482 if (vhost->action == IBMVFC_HOST_ACTION_LOGO) 483 vhost->action = action; 484 break; 485 case IBMVFC_HOST_ACTION_INIT_WAIT: 486 if (vhost->action == IBMVFC_HOST_ACTION_INIT) 487 vhost->action = action; 488 break; 489 case IBMVFC_HOST_ACTION_QUERY: 490 switch (vhost->action) { 491 case IBMVFC_HOST_ACTION_INIT_WAIT: 492 case IBMVFC_HOST_ACTION_NONE: 493 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 494 vhost->action = action; 495 break; 496 default: 497 break; 498 }; 499 break; 500 case IBMVFC_HOST_ACTION_TGT_INIT: 501 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS) 502 vhost->action = action; 503 break; 504 case IBMVFC_HOST_ACTION_INIT: 505 case IBMVFC_HOST_ACTION_TGT_DEL: 506 switch (vhost->action) { 507 case IBMVFC_HOST_ACTION_RESET: 508 case IBMVFC_HOST_ACTION_REENABLE: 509 break; 510 default: 511 vhost->action = action; 512 break; 513 }; 514 break; 515 case IBMVFC_HOST_ACTION_LOGO: 516 case IBMVFC_HOST_ACTION_QUERY_TGTS: 517 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 518 case IBMVFC_HOST_ACTION_NONE: 519 case IBMVFC_HOST_ACTION_RESET: 520 case IBMVFC_HOST_ACTION_REENABLE: 521 default: 522 vhost->action = action; 523 break; 524 }; 525 } 526 527 /** 528 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login) 529 * @vhost: ibmvfc host struct 530 * 531 * Return value: 532 * nothing 533 **/ 534 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost) 535 { 536 if (vhost->action == IBMVFC_HOST_ACTION_NONE) { 537 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 538 scsi_block_requests(vhost->host); 539 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 540 } 541 } else 542 vhost->reinit = 1; 543 544 wake_up(&vhost->work_wait_q); 545 } 546 547 /** 548 * ibmvfc_link_down - Handle a link down event from the adapter 549 * @vhost: ibmvfc host struct 550 * @state: ibmvfc host state to enter 551 * 552 **/ 553 static void ibmvfc_link_down(struct ibmvfc_host *vhost, 554 enum ibmvfc_host_state state) 555 { 556 struct ibmvfc_target *tgt; 557 558 ENTER; 559 scsi_block_requests(vhost->host); 560 list_for_each_entry(tgt, &vhost->targets, queue) 561 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 562 ibmvfc_set_host_state(vhost, state); 563 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); 564 vhost->events_to_log |= IBMVFC_AE_LINKDOWN; 565 wake_up(&vhost->work_wait_q); 566 LEAVE; 567 } 568 569 /** 570 * ibmvfc_init_host - Start host initialization 571 * @vhost: ibmvfc host struct 572 * 573 * Return value: 574 * nothing 575 **/ 576 static void ibmvfc_init_host(struct ibmvfc_host *vhost) 577 { 578 struct ibmvfc_target *tgt; 579 580 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { 581 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { 582 dev_err(vhost->dev, 583 "Host initialization retries exceeded. Taking adapter offline\n"); 584 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 585 return; 586 } 587 } 588 589 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 590 memset(vhost->async_crq.msgs, 0, PAGE_SIZE); 591 vhost->async_crq.cur = 0; 592 593 list_for_each_entry(tgt, &vhost->targets, queue) 594 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 595 scsi_block_requests(vhost->host); 596 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 597 vhost->job_step = ibmvfc_npiv_login; 598 wake_up(&vhost->work_wait_q); 599 } 600 } 601 602 /** 603 * ibmvfc_send_crq - Send a CRQ 604 * @vhost: ibmvfc host struct 605 * @word1: the first 64 bits of the data 606 * @word2: the second 64 bits of the data 607 * 608 * Return value: 609 * 0 on success / other on failure 610 **/ 611 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2) 612 { 613 struct vio_dev *vdev = to_vio_dev(vhost->dev); 614 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); 615 } 616 617 /** 618 * ibmvfc_send_crq_init - Send a CRQ init message 619 * @vhost: ibmvfc host struct 620 * 621 * Return value: 622 * 0 on success / other on failure 623 **/ 624 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost) 625 { 626 ibmvfc_dbg(vhost, "Sending CRQ init\n"); 627 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0); 628 } 629 630 /** 631 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message 632 * @vhost: ibmvfc host struct 633 * 634 * Return value: 635 * 0 on success / other on failure 636 **/ 637 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost) 638 { 639 ibmvfc_dbg(vhost, "Sending CRQ init complete\n"); 640 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0); 641 } 642 643 /** 644 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ 645 * @vhost: ibmvfc host struct 646 * 647 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters 648 * the crq with the hypervisor. 649 **/ 650 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost) 651 { 652 long rc = 0; 653 struct vio_dev *vdev = to_vio_dev(vhost->dev); 654 struct ibmvfc_crq_queue *crq = &vhost->crq; 655 656 ibmvfc_dbg(vhost, "Releasing CRQ\n"); 657 free_irq(vdev->irq, vhost); 658 tasklet_kill(&vhost->tasklet); 659 do { 660 if (rc) 661 msleep(100); 662 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 663 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 664 665 vhost->state = IBMVFC_NO_CRQ; 666 vhost->logged_in = 0; 667 dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); 668 free_page((unsigned long)crq->msgs); 669 } 670 671 /** 672 * ibmvfc_reenable_crq_queue - reenables the CRQ 673 * @vhost: ibmvfc host struct 674 * 675 * Return value: 676 * 0 on success / other on failure 677 **/ 678 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost) 679 { 680 int rc = 0; 681 struct vio_dev *vdev = to_vio_dev(vhost->dev); 682 683 /* Re-enable the CRQ */ 684 do { 685 if (rc) 686 msleep(100); 687 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); 688 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); 689 690 if (rc) 691 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc); 692 693 return rc; 694 } 695 696 /** 697 * ibmvfc_reset_crq - resets a crq after a failure 698 * @vhost: ibmvfc host struct 699 * 700 * Return value: 701 * 0 on success / other on failure 702 **/ 703 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost) 704 { 705 int rc = 0; 706 unsigned long flags; 707 struct vio_dev *vdev = to_vio_dev(vhost->dev); 708 struct ibmvfc_crq_queue *crq = &vhost->crq; 709 710 /* Close the CRQ */ 711 do { 712 if (rc) 713 msleep(100); 714 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 715 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 716 717 spin_lock_irqsave(vhost->host->host_lock, flags); 718 vhost->state = IBMVFC_NO_CRQ; 719 vhost->logged_in = 0; 720 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 721 722 /* Clean out the queue */ 723 memset(crq->msgs, 0, PAGE_SIZE); 724 crq->cur = 0; 725 726 /* And re-open it again */ 727 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 728 crq->msg_token, PAGE_SIZE); 729 730 if (rc == H_CLOSED) 731 /* Adapter is good, but other end is not ready */ 732 dev_warn(vhost->dev, "Partner adapter not ready\n"); 733 else if (rc != 0) 734 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc); 735 spin_unlock_irqrestore(vhost->host->host_lock, flags); 736 737 return rc; 738 } 739 740 /** 741 * ibmvfc_valid_event - Determines if event is valid. 742 * @pool: event_pool that contains the event 743 * @evt: ibmvfc event to be checked for validity 744 * 745 * Return value: 746 * 1 if event is valid / 0 if event is not valid 747 **/ 748 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool, 749 struct ibmvfc_event *evt) 750 { 751 int index = evt - pool->events; 752 if (index < 0 || index >= pool->size) /* outside of bounds */ 753 return 0; 754 if (evt != pool->events + index) /* unaligned */ 755 return 0; 756 return 1; 757 } 758 759 /** 760 * ibmvfc_free_event - Free the specified event 761 * @evt: ibmvfc_event to be freed 762 * 763 **/ 764 static void ibmvfc_free_event(struct ibmvfc_event *evt) 765 { 766 struct ibmvfc_host *vhost = evt->vhost; 767 struct ibmvfc_event_pool *pool = &vhost->pool; 768 769 BUG_ON(!ibmvfc_valid_event(pool, evt)); 770 BUG_ON(atomic_inc_return(&evt->free) != 1); 771 list_add_tail(&evt->queue, &vhost->free); 772 } 773 774 /** 775 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands 776 * @evt: ibmvfc event struct 777 * 778 * This function does not setup any error status, that must be done 779 * before this function gets called. 780 **/ 781 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt) 782 { 783 struct scsi_cmnd *cmnd = evt->cmnd; 784 785 if (cmnd) { 786 scsi_dma_unmap(cmnd); 787 cmnd->scsi_done(cmnd); 788 } 789 790 if (evt->eh_comp) 791 complete(evt->eh_comp); 792 793 ibmvfc_free_event(evt); 794 } 795 796 /** 797 * ibmvfc_fail_request - Fail request with specified error code 798 * @evt: ibmvfc event struct 799 * @error_code: error code to fail request with 800 * 801 * Return value: 802 * none 803 **/ 804 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code) 805 { 806 if (evt->cmnd) { 807 evt->cmnd->result = (error_code << 16); 808 evt->done = ibmvfc_scsi_eh_done; 809 } else 810 evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED; 811 812 list_del(&evt->queue); 813 del_timer(&evt->timer); 814 ibmvfc_trc_end(evt); 815 evt->done(evt); 816 } 817 818 /** 819 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests 820 * @vhost: ibmvfc host struct 821 * @error_code: error code to fail requests with 822 * 823 * Return value: 824 * none 825 **/ 826 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code) 827 { 828 struct ibmvfc_event *evt, *pos; 829 830 ibmvfc_dbg(vhost, "Purging all requests\n"); 831 list_for_each_entry_safe(evt, pos, &vhost->sent, queue) 832 ibmvfc_fail_request(evt, error_code); 833 } 834 835 /** 836 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ 837 * @vhost: struct ibmvfc host to reset 838 **/ 839 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost) 840 { 841 ibmvfc_purge_requests(vhost, DID_ERROR); 842 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 843 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); 844 } 845 846 /** 847 * __ibmvfc_reset_host - Reset the connection to the server (no locking) 848 * @vhost: struct ibmvfc host to reset 849 **/ 850 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost) 851 { 852 if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT && 853 !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 854 scsi_block_requests(vhost->host); 855 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO); 856 vhost->job_step = ibmvfc_npiv_logout; 857 wake_up(&vhost->work_wait_q); 858 } else 859 ibmvfc_hard_reset_host(vhost); 860 } 861 862 /** 863 * ibmvfc_reset_host - Reset the connection to the server 864 * @vhost: ibmvfc host struct 865 **/ 866 static void ibmvfc_reset_host(struct ibmvfc_host *vhost) 867 { 868 unsigned long flags; 869 870 spin_lock_irqsave(vhost->host->host_lock, flags); 871 __ibmvfc_reset_host(vhost); 872 spin_unlock_irqrestore(vhost->host->host_lock, flags); 873 } 874 875 /** 876 * ibmvfc_retry_host_init - Retry host initialization if allowed 877 * @vhost: ibmvfc host struct 878 * 879 * Returns: 1 if init will be retried / 0 if not 880 * 881 **/ 882 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost) 883 { 884 int retry = 0; 885 886 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) { 887 vhost->delay_init = 1; 888 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) { 889 dev_err(vhost->dev, 890 "Host initialization retries exceeded. Taking adapter offline\n"); 891 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 892 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES) 893 __ibmvfc_reset_host(vhost); 894 else { 895 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 896 retry = 1; 897 } 898 } 899 900 wake_up(&vhost->work_wait_q); 901 return retry; 902 } 903 904 /** 905 * __ibmvfc_get_target - Find the specified scsi_target (no locking) 906 * @starget: scsi target struct 907 * 908 * Return value: 909 * ibmvfc_target struct / NULL if not found 910 **/ 911 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget) 912 { 913 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 914 struct ibmvfc_host *vhost = shost_priv(shost); 915 struct ibmvfc_target *tgt; 916 917 list_for_each_entry(tgt, &vhost->targets, queue) 918 if (tgt->target_id == starget->id) { 919 kref_get(&tgt->kref); 920 return tgt; 921 } 922 return NULL; 923 } 924 925 /** 926 * ibmvfc_get_target - Find the specified scsi_target 927 * @starget: scsi target struct 928 * 929 * Return value: 930 * ibmvfc_target struct / NULL if not found 931 **/ 932 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget) 933 { 934 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 935 struct ibmvfc_target *tgt; 936 unsigned long flags; 937 938 spin_lock_irqsave(shost->host_lock, flags); 939 tgt = __ibmvfc_get_target(starget); 940 spin_unlock_irqrestore(shost->host_lock, flags); 941 return tgt; 942 } 943 944 /** 945 * ibmvfc_get_host_speed - Get host port speed 946 * @shost: scsi host struct 947 * 948 * Return value: 949 * none 950 **/ 951 static void ibmvfc_get_host_speed(struct Scsi_Host *shost) 952 { 953 struct ibmvfc_host *vhost = shost_priv(shost); 954 unsigned long flags; 955 956 spin_lock_irqsave(shost->host_lock, flags); 957 if (vhost->state == IBMVFC_ACTIVE) { 958 switch (vhost->login_buf->resp.link_speed / 100) { 959 case 1: 960 fc_host_speed(shost) = FC_PORTSPEED_1GBIT; 961 break; 962 case 2: 963 fc_host_speed(shost) = FC_PORTSPEED_2GBIT; 964 break; 965 case 4: 966 fc_host_speed(shost) = FC_PORTSPEED_4GBIT; 967 break; 968 case 8: 969 fc_host_speed(shost) = FC_PORTSPEED_8GBIT; 970 break; 971 case 10: 972 fc_host_speed(shost) = FC_PORTSPEED_10GBIT; 973 break; 974 case 16: 975 fc_host_speed(shost) = FC_PORTSPEED_16GBIT; 976 break; 977 default: 978 ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n", 979 vhost->login_buf->resp.link_speed / 100); 980 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; 981 break; 982 } 983 } else 984 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN; 985 spin_unlock_irqrestore(shost->host_lock, flags); 986 } 987 988 /** 989 * ibmvfc_get_host_port_state - Get host port state 990 * @shost: scsi host struct 991 * 992 * Return value: 993 * none 994 **/ 995 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost) 996 { 997 struct ibmvfc_host *vhost = shost_priv(shost); 998 unsigned long flags; 999 1000 spin_lock_irqsave(shost->host_lock, flags); 1001 switch (vhost->state) { 1002 case IBMVFC_INITIALIZING: 1003 case IBMVFC_ACTIVE: 1004 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 1005 break; 1006 case IBMVFC_LINK_DOWN: 1007 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 1008 break; 1009 case IBMVFC_LINK_DEAD: 1010 case IBMVFC_HOST_OFFLINE: 1011 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE; 1012 break; 1013 case IBMVFC_HALTED: 1014 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED; 1015 break; 1016 case IBMVFC_NO_CRQ: 1017 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 1018 break; 1019 default: 1020 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state); 1021 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 1022 break; 1023 } 1024 spin_unlock_irqrestore(shost->host_lock, flags); 1025 } 1026 1027 /** 1028 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout 1029 * @rport: rport struct 1030 * @timeout: timeout value 1031 * 1032 * Return value: 1033 * none 1034 **/ 1035 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 1036 { 1037 if (timeout) 1038 rport->dev_loss_tmo = timeout; 1039 else 1040 rport->dev_loss_tmo = 1; 1041 } 1042 1043 /** 1044 * ibmvfc_release_tgt - Free memory allocated for a target 1045 * @kref: kref struct 1046 * 1047 **/ 1048 static void ibmvfc_release_tgt(struct kref *kref) 1049 { 1050 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref); 1051 kfree(tgt); 1052 } 1053 1054 /** 1055 * ibmvfc_get_starget_node_name - Get SCSI target's node name 1056 * @starget: scsi target struct 1057 * 1058 * Return value: 1059 * none 1060 **/ 1061 static void ibmvfc_get_starget_node_name(struct scsi_target *starget) 1062 { 1063 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1064 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0; 1065 if (tgt) 1066 kref_put(&tgt->kref, ibmvfc_release_tgt); 1067 } 1068 1069 /** 1070 * ibmvfc_get_starget_port_name - Get SCSI target's port name 1071 * @starget: scsi target struct 1072 * 1073 * Return value: 1074 * none 1075 **/ 1076 static void ibmvfc_get_starget_port_name(struct scsi_target *starget) 1077 { 1078 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1079 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0; 1080 if (tgt) 1081 kref_put(&tgt->kref, ibmvfc_release_tgt); 1082 } 1083 1084 /** 1085 * ibmvfc_get_starget_port_id - Get SCSI target's port ID 1086 * @starget: scsi target struct 1087 * 1088 * Return value: 1089 * none 1090 **/ 1091 static void ibmvfc_get_starget_port_id(struct scsi_target *starget) 1092 { 1093 struct ibmvfc_target *tgt = ibmvfc_get_target(starget); 1094 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1; 1095 if (tgt) 1096 kref_put(&tgt->kref, ibmvfc_release_tgt); 1097 } 1098 1099 /** 1100 * ibmvfc_wait_while_resetting - Wait while the host resets 1101 * @vhost: ibmvfc host struct 1102 * 1103 * Return value: 1104 * 0 on success / other on failure 1105 **/ 1106 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost) 1107 { 1108 long timeout = wait_event_timeout(vhost->init_wait_q, 1109 ((vhost->state == IBMVFC_ACTIVE || 1110 vhost->state == IBMVFC_HOST_OFFLINE || 1111 vhost->state == IBMVFC_LINK_DEAD) && 1112 vhost->action == IBMVFC_HOST_ACTION_NONE), 1113 (init_timeout * HZ)); 1114 1115 return timeout ? 0 : -EIO; 1116 } 1117 1118 /** 1119 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization 1120 * @shost: scsi host struct 1121 * 1122 * Return value: 1123 * 0 on success / other on failure 1124 **/ 1125 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost) 1126 { 1127 struct ibmvfc_host *vhost = shost_priv(shost); 1128 1129 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n"); 1130 ibmvfc_reset_host(vhost); 1131 return ibmvfc_wait_while_resetting(vhost); 1132 } 1133 1134 /** 1135 * ibmvfc_gather_partition_info - Gather info about the LPAR 1136 * 1137 * Return value: 1138 * none 1139 **/ 1140 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost) 1141 { 1142 struct device_node *rootdn; 1143 const char *name; 1144 const unsigned int *num; 1145 1146 rootdn = of_find_node_by_path("/"); 1147 if (!rootdn) 1148 return; 1149 1150 name = of_get_property(rootdn, "ibm,partition-name", NULL); 1151 if (name) 1152 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name)); 1153 num = of_get_property(rootdn, "ibm,partition-no", NULL); 1154 if (num) 1155 vhost->partition_number = *num; 1156 of_node_put(rootdn); 1157 } 1158 1159 /** 1160 * ibmvfc_set_login_info - Setup info for NPIV login 1161 * @vhost: ibmvfc host struct 1162 * 1163 * Return value: 1164 * none 1165 **/ 1166 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost) 1167 { 1168 struct ibmvfc_npiv_login *login_info = &vhost->login_info; 1169 struct device_node *of_node = vhost->dev->of_node; 1170 const char *location; 1171 1172 memset(login_info, 0, sizeof(*login_info)); 1173 1174 login_info->ostype = IBMVFC_OS_LINUX; 1175 login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9; 1176 login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu); 1177 login_info->max_response = sizeof(struct ibmvfc_fcp_rsp); 1178 login_info->partition_num = vhost->partition_number; 1179 login_info->vfc_frame_version = 1; 1180 login_info->fcp_version = 3; 1181 login_info->flags = IBMVFC_FLUSH_ON_HALT; 1182 if (vhost->client_migrated) 1183 login_info->flags |= IBMVFC_CLIENT_MIGRATED; 1184 1185 login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ; 1186 login_info->capabilities = IBMVFC_CAN_MIGRATE; 1187 login_info->async.va = vhost->async_crq.msg_token; 1188 login_info->async.len = vhost->async_crq.size * sizeof(*vhost->async_crq.msgs); 1189 strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME); 1190 strncpy(login_info->device_name, 1191 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME); 1192 1193 location = of_get_property(of_node, "ibm,loc-code", NULL); 1194 location = location ? location : dev_name(vhost->dev); 1195 strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME); 1196 } 1197 1198 /** 1199 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host 1200 * @vhost: ibmvfc host who owns the event pool 1201 * 1202 * Returns zero on success. 1203 **/ 1204 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost) 1205 { 1206 int i; 1207 struct ibmvfc_event_pool *pool = &vhost->pool; 1208 1209 ENTER; 1210 pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ; 1211 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); 1212 if (!pool->events) 1213 return -ENOMEM; 1214 1215 pool->iu_storage = dma_alloc_coherent(vhost->dev, 1216 pool->size * sizeof(*pool->iu_storage), 1217 &pool->iu_token, 0); 1218 1219 if (!pool->iu_storage) { 1220 kfree(pool->events); 1221 return -ENOMEM; 1222 } 1223 1224 for (i = 0; i < pool->size; ++i) { 1225 struct ibmvfc_event *evt = &pool->events[i]; 1226 atomic_set(&evt->free, 1); 1227 evt->crq.valid = 0x80; 1228 evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i); 1229 evt->xfer_iu = pool->iu_storage + i; 1230 evt->vhost = vhost; 1231 evt->ext_list = NULL; 1232 list_add_tail(&evt->queue, &vhost->free); 1233 } 1234 1235 LEAVE; 1236 return 0; 1237 } 1238 1239 /** 1240 * ibmvfc_free_event_pool - Frees memory of the event pool of a host 1241 * @vhost: ibmvfc host who owns the event pool 1242 * 1243 **/ 1244 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost) 1245 { 1246 int i; 1247 struct ibmvfc_event_pool *pool = &vhost->pool; 1248 1249 ENTER; 1250 for (i = 0; i < pool->size; ++i) { 1251 list_del(&pool->events[i].queue); 1252 BUG_ON(atomic_read(&pool->events[i].free) != 1); 1253 if (pool->events[i].ext_list) 1254 dma_pool_free(vhost->sg_pool, 1255 pool->events[i].ext_list, 1256 pool->events[i].ext_list_token); 1257 } 1258 1259 kfree(pool->events); 1260 dma_free_coherent(vhost->dev, 1261 pool->size * sizeof(*pool->iu_storage), 1262 pool->iu_storage, pool->iu_token); 1263 LEAVE; 1264 } 1265 1266 /** 1267 * ibmvfc_get_event - Gets the next free event in pool 1268 * @vhost: ibmvfc host struct 1269 * 1270 * Returns a free event from the pool. 1271 **/ 1272 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost) 1273 { 1274 struct ibmvfc_event *evt; 1275 1276 BUG_ON(list_empty(&vhost->free)); 1277 evt = list_entry(vhost->free.next, struct ibmvfc_event, queue); 1278 atomic_set(&evt->free, 0); 1279 list_del(&evt->queue); 1280 return evt; 1281 } 1282 1283 /** 1284 * ibmvfc_init_event - Initialize fields in an event struct that are always 1285 * required. 1286 * @evt: The event 1287 * @done: Routine to call when the event is responded to 1288 * @format: SRP or MAD format 1289 **/ 1290 static void ibmvfc_init_event(struct ibmvfc_event *evt, 1291 void (*done) (struct ibmvfc_event *), u8 format) 1292 { 1293 evt->cmnd = NULL; 1294 evt->sync_iu = NULL; 1295 evt->crq.format = format; 1296 evt->done = done; 1297 evt->eh_comp = NULL; 1298 } 1299 1300 /** 1301 * ibmvfc_map_sg_list - Initialize scatterlist 1302 * @scmd: scsi command struct 1303 * @nseg: number of scatterlist segments 1304 * @md: memory descriptor list to initialize 1305 **/ 1306 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg, 1307 struct srp_direct_buf *md) 1308 { 1309 int i; 1310 struct scatterlist *sg; 1311 1312 scsi_for_each_sg(scmd, sg, nseg, i) { 1313 md[i].va = sg_dma_address(sg); 1314 md[i].len = sg_dma_len(sg); 1315 md[i].key = 0; 1316 } 1317 } 1318 1319 /** 1320 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields 1321 * @scmd: Scsi_Cmnd with the scatterlist 1322 * @evt: ibmvfc event struct 1323 * @vfc_cmd: vfc_cmd that contains the memory descriptor 1324 * @dev: device for which to map dma memory 1325 * 1326 * Returns: 1327 * 0 on success / non-zero on failure 1328 **/ 1329 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd, 1330 struct ibmvfc_event *evt, 1331 struct ibmvfc_cmd *vfc_cmd, struct device *dev) 1332 { 1333 1334 int sg_mapped; 1335 struct srp_direct_buf *data = &vfc_cmd->ioba; 1336 struct ibmvfc_host *vhost = dev_get_drvdata(dev); 1337 1338 sg_mapped = scsi_dma_map(scmd); 1339 if (!sg_mapped) { 1340 vfc_cmd->flags |= IBMVFC_NO_MEM_DESC; 1341 return 0; 1342 } else if (unlikely(sg_mapped < 0)) { 1343 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1344 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n"); 1345 return sg_mapped; 1346 } 1347 1348 if (scmd->sc_data_direction == DMA_TO_DEVICE) { 1349 vfc_cmd->flags |= IBMVFC_WRITE; 1350 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA; 1351 } else { 1352 vfc_cmd->flags |= IBMVFC_READ; 1353 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA; 1354 } 1355 1356 if (sg_mapped == 1) { 1357 ibmvfc_map_sg_list(scmd, sg_mapped, data); 1358 return 0; 1359 } 1360 1361 vfc_cmd->flags |= IBMVFC_SCATTERLIST; 1362 1363 if (!evt->ext_list) { 1364 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC, 1365 &evt->ext_list_token); 1366 1367 if (!evt->ext_list) { 1368 scsi_dma_unmap(scmd); 1369 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1370 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n"); 1371 return -ENOMEM; 1372 } 1373 } 1374 1375 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list); 1376 1377 data->va = evt->ext_list_token; 1378 data->len = sg_mapped * sizeof(struct srp_direct_buf); 1379 data->key = 0; 1380 return 0; 1381 } 1382 1383 /** 1384 * ibmvfc_timeout - Internal command timeout handler 1385 * @evt: struct ibmvfc_event that timed out 1386 * 1387 * Called when an internally generated command times out 1388 **/ 1389 static void ibmvfc_timeout(struct ibmvfc_event *evt) 1390 { 1391 struct ibmvfc_host *vhost = evt->vhost; 1392 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt); 1393 ibmvfc_reset_host(vhost); 1394 } 1395 1396 /** 1397 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq() 1398 * @evt: event to be sent 1399 * @vhost: ibmvfc host struct 1400 * @timeout: timeout in seconds - 0 means do not time command 1401 * 1402 * Returns the value returned from ibmvfc_send_crq(). (Zero for success) 1403 **/ 1404 static int ibmvfc_send_event(struct ibmvfc_event *evt, 1405 struct ibmvfc_host *vhost, unsigned long timeout) 1406 { 1407 u64 *crq_as_u64 = (u64 *) &evt->crq; 1408 int rc; 1409 1410 /* Copy the IU into the transfer area */ 1411 *evt->xfer_iu = evt->iu; 1412 if (evt->crq.format == IBMVFC_CMD_FORMAT) 1413 evt->xfer_iu->cmd.tag = (u64)evt; 1414 else if (evt->crq.format == IBMVFC_MAD_FORMAT) 1415 evt->xfer_iu->mad_common.tag = (u64)evt; 1416 else 1417 BUG(); 1418 1419 list_add_tail(&evt->queue, &vhost->sent); 1420 init_timer(&evt->timer); 1421 1422 if (timeout) { 1423 evt->timer.data = (unsigned long) evt; 1424 evt->timer.expires = jiffies + (timeout * HZ); 1425 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout; 1426 add_timer(&evt->timer); 1427 } 1428 1429 mb(); 1430 1431 if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) { 1432 list_del(&evt->queue); 1433 del_timer(&evt->timer); 1434 1435 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. 1436 * Firmware will send a CRQ with a transport event (0xFF) to 1437 * tell this client what has happened to the transport. This 1438 * will be handled in ibmvfc_handle_crq() 1439 */ 1440 if (rc == H_CLOSED) { 1441 if (printk_ratelimit()) 1442 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n"); 1443 if (evt->cmnd) 1444 scsi_dma_unmap(evt->cmnd); 1445 ibmvfc_free_event(evt); 1446 return SCSI_MLQUEUE_HOST_BUSY; 1447 } 1448 1449 dev_err(vhost->dev, "Send error (rc=%d)\n", rc); 1450 if (evt->cmnd) { 1451 evt->cmnd->result = DID_ERROR << 16; 1452 evt->done = ibmvfc_scsi_eh_done; 1453 } else 1454 evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR; 1455 1456 evt->done(evt); 1457 } else 1458 ibmvfc_trc_start(evt); 1459 1460 return 0; 1461 } 1462 1463 /** 1464 * ibmvfc_log_error - Log an error for the failed command if appropriate 1465 * @evt: ibmvfc event to log 1466 * 1467 **/ 1468 static void ibmvfc_log_error(struct ibmvfc_event *evt) 1469 { 1470 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 1471 struct ibmvfc_host *vhost = evt->vhost; 1472 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; 1473 struct scsi_cmnd *cmnd = evt->cmnd; 1474 const char *err = unknown_error; 1475 int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error); 1476 int logerr = 0; 1477 int rsp_code = 0; 1478 1479 if (index >= 0) { 1480 logerr = cmd_status[index].log; 1481 err = cmd_status[index].name; 1482 } 1483 1484 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1))) 1485 return; 1486 1487 if (rsp->flags & FCP_RSP_LEN_VALID) 1488 rsp_code = rsp->data.info.rsp_code; 1489 1490 scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) " 1491 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n", 1492 cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error, 1493 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status); 1494 } 1495 1496 /** 1497 * ibmvfc_relogin - Log back into the specified device 1498 * @sdev: scsi device struct 1499 * 1500 **/ 1501 static void ibmvfc_relogin(struct scsi_device *sdev) 1502 { 1503 struct ibmvfc_host *vhost = shost_priv(sdev->host); 1504 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 1505 struct ibmvfc_target *tgt; 1506 1507 list_for_each_entry(tgt, &vhost->targets, queue) { 1508 if (rport == tgt->rport) { 1509 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 1510 break; 1511 } 1512 } 1513 1514 ibmvfc_reinit_host(vhost); 1515 } 1516 1517 /** 1518 * ibmvfc_scsi_done - Handle responses from commands 1519 * @evt: ibmvfc event to be handled 1520 * 1521 * Used as a callback when sending scsi cmds. 1522 **/ 1523 static void ibmvfc_scsi_done(struct ibmvfc_event *evt) 1524 { 1525 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd; 1526 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp; 1527 struct scsi_cmnd *cmnd = evt->cmnd; 1528 u32 rsp_len = 0; 1529 u32 sense_len = rsp->fcp_sense_len; 1530 1531 if (cmnd) { 1532 if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID) 1533 scsi_set_resid(cmnd, vfc_cmd->adapter_resid); 1534 else if (rsp->flags & FCP_RESID_UNDER) 1535 scsi_set_resid(cmnd, rsp->fcp_resid); 1536 else 1537 scsi_set_resid(cmnd, 0); 1538 1539 if (vfc_cmd->status) { 1540 cmnd->result = ibmvfc_get_err_result(vfc_cmd); 1541 1542 if (rsp->flags & FCP_RSP_LEN_VALID) 1543 rsp_len = rsp->fcp_rsp_len; 1544 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE) 1545 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len; 1546 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8) 1547 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len); 1548 if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED)) 1549 ibmvfc_relogin(cmnd->device); 1550 1551 if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER))) 1552 cmnd->result = (DID_ERROR << 16); 1553 1554 ibmvfc_log_error(evt); 1555 } 1556 1557 if (!cmnd->result && 1558 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow)) 1559 cmnd->result = (DID_ERROR << 16); 1560 1561 scsi_dma_unmap(cmnd); 1562 cmnd->scsi_done(cmnd); 1563 } 1564 1565 if (evt->eh_comp) 1566 complete(evt->eh_comp); 1567 1568 ibmvfc_free_event(evt); 1569 } 1570 1571 /** 1572 * ibmvfc_host_chkready - Check if the host can accept commands 1573 * @vhost: struct ibmvfc host 1574 * 1575 * Returns: 1576 * 1 if host can accept command / 0 if not 1577 **/ 1578 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost) 1579 { 1580 int result = 0; 1581 1582 switch (vhost->state) { 1583 case IBMVFC_LINK_DEAD: 1584 case IBMVFC_HOST_OFFLINE: 1585 result = DID_NO_CONNECT << 16; 1586 break; 1587 case IBMVFC_NO_CRQ: 1588 case IBMVFC_INITIALIZING: 1589 case IBMVFC_HALTED: 1590 case IBMVFC_LINK_DOWN: 1591 result = DID_REQUEUE << 16; 1592 break; 1593 case IBMVFC_ACTIVE: 1594 result = 0; 1595 break; 1596 }; 1597 1598 return result; 1599 } 1600 1601 /** 1602 * ibmvfc_queuecommand - The queuecommand function of the scsi template 1603 * @cmnd: struct scsi_cmnd to be executed 1604 * @done: Callback function to be called when cmnd is completed 1605 * 1606 * Returns: 1607 * 0 on success / other on failure 1608 **/ 1609 static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd, 1610 void (*done) (struct scsi_cmnd *)) 1611 { 1612 struct ibmvfc_host *vhost = shost_priv(cmnd->device->host); 1613 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device)); 1614 struct ibmvfc_cmd *vfc_cmd; 1615 struct ibmvfc_event *evt; 1616 u8 tag[2]; 1617 int rc; 1618 1619 if (unlikely((rc = fc_remote_port_chkready(rport))) || 1620 unlikely((rc = ibmvfc_host_chkready(vhost)))) { 1621 cmnd->result = rc; 1622 done(cmnd); 1623 return 0; 1624 } 1625 1626 cmnd->result = (DID_OK << 16); 1627 evt = ibmvfc_get_event(vhost); 1628 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT); 1629 evt->cmnd = cmnd; 1630 cmnd->scsi_done = done; 1631 vfc_cmd = &evt->iu.cmd; 1632 memset(vfc_cmd, 0, sizeof(*vfc_cmd)); 1633 vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp); 1634 vfc_cmd->resp.len = sizeof(vfc_cmd->rsp); 1635 vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE; 1636 vfc_cmd->payload_len = sizeof(vfc_cmd->iu); 1637 vfc_cmd->resp_len = sizeof(vfc_cmd->rsp); 1638 vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata; 1639 vfc_cmd->tgt_scsi_id = rport->port_id; 1640 vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd); 1641 int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun); 1642 memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len); 1643 1644 if (scsi_populate_tag_msg(cmnd, tag)) { 1645 vfc_cmd->task_tag = tag[1]; 1646 switch (tag[0]) { 1647 case MSG_SIMPLE_TAG: 1648 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK; 1649 break; 1650 case MSG_HEAD_TAG: 1651 vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE; 1652 break; 1653 case MSG_ORDERED_TAG: 1654 vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK; 1655 break; 1656 }; 1657 } 1658 1659 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev)))) 1660 return ibmvfc_send_event(evt, vhost, 0); 1661 1662 ibmvfc_free_event(evt); 1663 if (rc == -ENOMEM) 1664 return SCSI_MLQUEUE_HOST_BUSY; 1665 1666 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 1667 scmd_printk(KERN_ERR, cmnd, 1668 "Failed to map DMA buffer for command. rc=%d\n", rc); 1669 1670 cmnd->result = DID_ERROR << 16; 1671 done(cmnd); 1672 return 0; 1673 } 1674 1675 static DEF_SCSI_QCMD(ibmvfc_queuecommand) 1676 1677 /** 1678 * ibmvfc_sync_completion - Signal that a synchronous command has completed 1679 * @evt: ibmvfc event struct 1680 * 1681 **/ 1682 static void ibmvfc_sync_completion(struct ibmvfc_event *evt) 1683 { 1684 /* copy the response back */ 1685 if (evt->sync_iu) 1686 *evt->sync_iu = *evt->xfer_iu; 1687 1688 complete(&evt->comp); 1689 } 1690 1691 /** 1692 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands 1693 * @evt: struct ibmvfc_event 1694 * 1695 **/ 1696 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt) 1697 { 1698 struct ibmvfc_host *vhost = evt->vhost; 1699 1700 ibmvfc_free_event(evt); 1701 vhost->aborting_passthru = 0; 1702 dev_info(vhost->dev, "Passthru command cancelled\n"); 1703 } 1704 1705 /** 1706 * ibmvfc_bsg_timeout - Handle a BSG timeout 1707 * @job: struct fc_bsg_job that timed out 1708 * 1709 * Returns: 1710 * 0 on success / other on failure 1711 **/ 1712 static int ibmvfc_bsg_timeout(struct fc_bsg_job *job) 1713 { 1714 struct ibmvfc_host *vhost = shost_priv(job->shost); 1715 unsigned long port_id = (unsigned long)job->dd_data; 1716 struct ibmvfc_event *evt; 1717 struct ibmvfc_tmf *tmf; 1718 unsigned long flags; 1719 int rc; 1720 1721 ENTER; 1722 spin_lock_irqsave(vhost->host->host_lock, flags); 1723 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) { 1724 __ibmvfc_reset_host(vhost); 1725 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1726 return 0; 1727 } 1728 1729 vhost->aborting_passthru = 1; 1730 evt = ibmvfc_get_event(vhost); 1731 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT); 1732 1733 tmf = &evt->iu.tmf; 1734 memset(tmf, 0, sizeof(*tmf)); 1735 tmf->common.version = 1; 1736 tmf->common.opcode = IBMVFC_TMF_MAD; 1737 tmf->common.length = sizeof(*tmf); 1738 tmf->scsi_id = port_id; 1739 tmf->cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY; 1740 tmf->my_cancel_key = IBMVFC_INTERNAL_CANCEL_KEY; 1741 rc = ibmvfc_send_event(evt, vhost, default_timeout); 1742 1743 if (rc != 0) { 1744 vhost->aborting_passthru = 0; 1745 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc); 1746 rc = -EIO; 1747 } else 1748 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n", 1749 port_id); 1750 1751 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1752 1753 LEAVE; 1754 return rc; 1755 } 1756 1757 /** 1758 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command 1759 * @vhost: struct ibmvfc_host to send command 1760 * @port_id: port ID to send command 1761 * 1762 * Returns: 1763 * 0 on success / other on failure 1764 **/ 1765 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id) 1766 { 1767 struct ibmvfc_port_login *plogi; 1768 struct ibmvfc_target *tgt; 1769 struct ibmvfc_event *evt; 1770 union ibmvfc_iu rsp_iu; 1771 unsigned long flags; 1772 int rc = 0, issue_login = 1; 1773 1774 ENTER; 1775 spin_lock_irqsave(vhost->host->host_lock, flags); 1776 list_for_each_entry(tgt, &vhost->targets, queue) { 1777 if (tgt->scsi_id == port_id) { 1778 issue_login = 0; 1779 break; 1780 } 1781 } 1782 1783 if (!issue_login) 1784 goto unlock_out; 1785 if (unlikely((rc = ibmvfc_host_chkready(vhost)))) 1786 goto unlock_out; 1787 1788 evt = ibmvfc_get_event(vhost); 1789 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 1790 plogi = &evt->iu.plogi; 1791 memset(plogi, 0, sizeof(*plogi)); 1792 plogi->common.version = 1; 1793 plogi->common.opcode = IBMVFC_PORT_LOGIN; 1794 plogi->common.length = sizeof(*plogi); 1795 plogi->scsi_id = port_id; 1796 evt->sync_iu = &rsp_iu; 1797 init_completion(&evt->comp); 1798 1799 rc = ibmvfc_send_event(evt, vhost, default_timeout); 1800 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1801 1802 if (rc) 1803 return -EIO; 1804 1805 wait_for_completion(&evt->comp); 1806 1807 if (rsp_iu.plogi.common.status) 1808 rc = -EIO; 1809 1810 spin_lock_irqsave(vhost->host->host_lock, flags); 1811 ibmvfc_free_event(evt); 1812 unlock_out: 1813 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1814 LEAVE; 1815 return rc; 1816 } 1817 1818 /** 1819 * ibmvfc_bsg_request - Handle a BSG request 1820 * @job: struct fc_bsg_job to be executed 1821 * 1822 * Returns: 1823 * 0 on success / other on failure 1824 **/ 1825 static int ibmvfc_bsg_request(struct fc_bsg_job *job) 1826 { 1827 struct ibmvfc_host *vhost = shost_priv(job->shost); 1828 struct fc_rport *rport = job->rport; 1829 struct ibmvfc_passthru_mad *mad; 1830 struct ibmvfc_event *evt; 1831 union ibmvfc_iu rsp_iu; 1832 unsigned long flags, port_id = -1; 1833 unsigned int code = job->request->msgcode; 1834 int rc = 0, req_seg, rsp_seg, issue_login = 0; 1835 u32 fc_flags, rsp_len; 1836 1837 ENTER; 1838 job->reply->reply_payload_rcv_len = 0; 1839 if (rport) 1840 port_id = rport->port_id; 1841 1842 switch (code) { 1843 case FC_BSG_HST_ELS_NOLOGIN: 1844 port_id = (job->request->rqst_data.h_els.port_id[0] << 16) | 1845 (job->request->rqst_data.h_els.port_id[1] << 8) | 1846 job->request->rqst_data.h_els.port_id[2]; 1847 case FC_BSG_RPT_ELS: 1848 fc_flags = IBMVFC_FC_ELS; 1849 break; 1850 case FC_BSG_HST_CT: 1851 issue_login = 1; 1852 port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) | 1853 (job->request->rqst_data.h_ct.port_id[1] << 8) | 1854 job->request->rqst_data.h_ct.port_id[2]; 1855 case FC_BSG_RPT_CT: 1856 fc_flags = IBMVFC_FC_CT_IU; 1857 break; 1858 default: 1859 return -ENOTSUPP; 1860 }; 1861 1862 if (port_id == -1) 1863 return -EINVAL; 1864 if (!mutex_trylock(&vhost->passthru_mutex)) 1865 return -EBUSY; 1866 1867 job->dd_data = (void *)port_id; 1868 req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list, 1869 job->request_payload.sg_cnt, DMA_TO_DEVICE); 1870 1871 if (!req_seg) { 1872 mutex_unlock(&vhost->passthru_mutex); 1873 return -ENOMEM; 1874 } 1875 1876 rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list, 1877 job->reply_payload.sg_cnt, DMA_FROM_DEVICE); 1878 1879 if (!rsp_seg) { 1880 dma_unmap_sg(vhost->dev, job->request_payload.sg_list, 1881 job->request_payload.sg_cnt, DMA_TO_DEVICE); 1882 mutex_unlock(&vhost->passthru_mutex); 1883 return -ENOMEM; 1884 } 1885 1886 if (req_seg > 1 || rsp_seg > 1) { 1887 rc = -EINVAL; 1888 goto out; 1889 } 1890 1891 if (issue_login) 1892 rc = ibmvfc_bsg_plogi(vhost, port_id); 1893 1894 spin_lock_irqsave(vhost->host->host_lock, flags); 1895 1896 if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) || 1897 unlikely((rc = ibmvfc_host_chkready(vhost)))) { 1898 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1899 goto out; 1900 } 1901 1902 evt = ibmvfc_get_event(vhost); 1903 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 1904 mad = &evt->iu.passthru; 1905 1906 memset(mad, 0, sizeof(*mad)); 1907 mad->common.version = 1; 1908 mad->common.opcode = IBMVFC_PASSTHRU; 1909 mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu); 1910 1911 mad->cmd_ioba.va = (u64)evt->crq.ioba + 1912 offsetof(struct ibmvfc_passthru_mad, iu); 1913 mad->cmd_ioba.len = sizeof(mad->iu); 1914 1915 mad->iu.cmd_len = job->request_payload.payload_len; 1916 mad->iu.rsp_len = job->reply_payload.payload_len; 1917 mad->iu.flags = fc_flags; 1918 mad->iu.cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY; 1919 1920 mad->iu.cmd.va = sg_dma_address(job->request_payload.sg_list); 1921 mad->iu.cmd.len = sg_dma_len(job->request_payload.sg_list); 1922 mad->iu.rsp.va = sg_dma_address(job->reply_payload.sg_list); 1923 mad->iu.rsp.len = sg_dma_len(job->reply_payload.sg_list); 1924 mad->iu.scsi_id = port_id; 1925 mad->iu.tag = (u64)evt; 1926 rsp_len = mad->iu.rsp.len; 1927 1928 evt->sync_iu = &rsp_iu; 1929 init_completion(&evt->comp); 1930 rc = ibmvfc_send_event(evt, vhost, 0); 1931 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1932 1933 if (rc) { 1934 rc = -EIO; 1935 goto out; 1936 } 1937 1938 wait_for_completion(&evt->comp); 1939 1940 if (rsp_iu.passthru.common.status) 1941 rc = -EIO; 1942 else 1943 job->reply->reply_payload_rcv_len = rsp_len; 1944 1945 spin_lock_irqsave(vhost->host->host_lock, flags); 1946 ibmvfc_free_event(evt); 1947 spin_unlock_irqrestore(vhost->host->host_lock, flags); 1948 job->reply->result = rc; 1949 job->job_done(job); 1950 rc = 0; 1951 out: 1952 dma_unmap_sg(vhost->dev, job->request_payload.sg_list, 1953 job->request_payload.sg_cnt, DMA_TO_DEVICE); 1954 dma_unmap_sg(vhost->dev, job->reply_payload.sg_list, 1955 job->reply_payload.sg_cnt, DMA_FROM_DEVICE); 1956 mutex_unlock(&vhost->passthru_mutex); 1957 LEAVE; 1958 return rc; 1959 } 1960 1961 /** 1962 * ibmvfc_reset_device - Reset the device with the specified reset type 1963 * @sdev: scsi device to reset 1964 * @type: reset type 1965 * @desc: reset type description for log messages 1966 * 1967 * Returns: 1968 * 0 on success / other on failure 1969 **/ 1970 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc) 1971 { 1972 struct ibmvfc_host *vhost = shost_priv(sdev->host); 1973 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 1974 struct ibmvfc_cmd *tmf; 1975 struct ibmvfc_event *evt = NULL; 1976 union ibmvfc_iu rsp_iu; 1977 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp; 1978 int rsp_rc = -EBUSY; 1979 unsigned long flags; 1980 int rsp_code = 0; 1981 1982 spin_lock_irqsave(vhost->host->host_lock, flags); 1983 if (vhost->state == IBMVFC_ACTIVE) { 1984 evt = ibmvfc_get_event(vhost); 1985 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); 1986 1987 tmf = &evt->iu.cmd; 1988 memset(tmf, 0, sizeof(*tmf)); 1989 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp); 1990 tmf->resp.len = sizeof(tmf->rsp); 1991 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE; 1992 tmf->payload_len = sizeof(tmf->iu); 1993 tmf->resp_len = sizeof(tmf->rsp); 1994 tmf->cancel_key = (unsigned long)sdev->hostdata; 1995 tmf->tgt_scsi_id = rport->port_id; 1996 int_to_scsilun(sdev->lun, &tmf->iu.lun); 1997 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF); 1998 tmf->iu.tmf_flags = type; 1999 evt->sync_iu = &rsp_iu; 2000 2001 init_completion(&evt->comp); 2002 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2003 } 2004 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2005 2006 if (rsp_rc != 0) { 2007 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n", 2008 desc, rsp_rc); 2009 return -EIO; 2010 } 2011 2012 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc); 2013 wait_for_completion(&evt->comp); 2014 2015 if (rsp_iu.cmd.status) 2016 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd); 2017 2018 if (rsp_code) { 2019 if (fc_rsp->flags & FCP_RSP_LEN_VALID) 2020 rsp_code = fc_rsp->data.info.rsp_code; 2021 2022 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) " 2023 "flags: %x fcp_rsp: %x, scsi_status: %x\n", 2024 desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error), 2025 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code, 2026 fc_rsp->scsi_status); 2027 rsp_rc = -EIO; 2028 } else 2029 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc); 2030 2031 spin_lock_irqsave(vhost->host->host_lock, flags); 2032 ibmvfc_free_event(evt); 2033 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2034 return rsp_rc; 2035 } 2036 2037 /** 2038 * ibmvfc_match_rport - Match function for specified remote port 2039 * @evt: ibmvfc event struct 2040 * @device: device to match (rport) 2041 * 2042 * Returns: 2043 * 1 if event matches rport / 0 if event does not match rport 2044 **/ 2045 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport) 2046 { 2047 struct fc_rport *cmd_rport; 2048 2049 if (evt->cmnd) { 2050 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device)); 2051 if (cmd_rport == rport) 2052 return 1; 2053 } 2054 return 0; 2055 } 2056 2057 /** 2058 * ibmvfc_match_target - Match function for specified target 2059 * @evt: ibmvfc event struct 2060 * @device: device to match (starget) 2061 * 2062 * Returns: 2063 * 1 if event matches starget / 0 if event does not match starget 2064 **/ 2065 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device) 2066 { 2067 if (evt->cmnd && scsi_target(evt->cmnd->device) == device) 2068 return 1; 2069 return 0; 2070 } 2071 2072 /** 2073 * ibmvfc_match_lun - Match function for specified LUN 2074 * @evt: ibmvfc event struct 2075 * @device: device to match (sdev) 2076 * 2077 * Returns: 2078 * 1 if event matches sdev / 0 if event does not match sdev 2079 **/ 2080 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device) 2081 { 2082 if (evt->cmnd && evt->cmnd->device == device) 2083 return 1; 2084 return 0; 2085 } 2086 2087 /** 2088 * ibmvfc_wait_for_ops - Wait for ops to complete 2089 * @vhost: ibmvfc host struct 2090 * @device: device to match (starget or sdev) 2091 * @match: match function 2092 * 2093 * Returns: 2094 * SUCCESS / FAILED 2095 **/ 2096 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device, 2097 int (*match) (struct ibmvfc_event *, void *)) 2098 { 2099 struct ibmvfc_event *evt; 2100 DECLARE_COMPLETION_ONSTACK(comp); 2101 int wait; 2102 unsigned long flags; 2103 signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ; 2104 2105 ENTER; 2106 do { 2107 wait = 0; 2108 spin_lock_irqsave(vhost->host->host_lock, flags); 2109 list_for_each_entry(evt, &vhost->sent, queue) { 2110 if (match(evt, device)) { 2111 evt->eh_comp = ∁ 2112 wait++; 2113 } 2114 } 2115 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2116 2117 if (wait) { 2118 timeout = wait_for_completion_timeout(&comp, timeout); 2119 2120 if (!timeout) { 2121 wait = 0; 2122 spin_lock_irqsave(vhost->host->host_lock, flags); 2123 list_for_each_entry(evt, &vhost->sent, queue) { 2124 if (match(evt, device)) { 2125 evt->eh_comp = NULL; 2126 wait++; 2127 } 2128 } 2129 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2130 if (wait) 2131 dev_err(vhost->dev, "Timed out waiting for aborted commands\n"); 2132 LEAVE; 2133 return wait ? FAILED : SUCCESS; 2134 } 2135 } 2136 } while (wait); 2137 2138 LEAVE; 2139 return SUCCESS; 2140 } 2141 2142 /** 2143 * ibmvfc_cancel_all - Cancel all outstanding commands to the device 2144 * @sdev: scsi device to cancel commands 2145 * @type: type of error recovery being performed 2146 * 2147 * This sends a cancel to the VIOS for the specified device. This does 2148 * NOT send any abort to the actual device. That must be done separately. 2149 * 2150 * Returns: 2151 * 0 on success / other on failure 2152 **/ 2153 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type) 2154 { 2155 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2156 struct scsi_target *starget = scsi_target(sdev); 2157 struct fc_rport *rport = starget_to_rport(starget); 2158 struct ibmvfc_tmf *tmf; 2159 struct ibmvfc_event *evt, *found_evt; 2160 union ibmvfc_iu rsp; 2161 int rsp_rc = -EBUSY; 2162 unsigned long flags; 2163 u16 status; 2164 2165 ENTER; 2166 spin_lock_irqsave(vhost->host->host_lock, flags); 2167 found_evt = NULL; 2168 list_for_each_entry(evt, &vhost->sent, queue) { 2169 if (evt->cmnd && evt->cmnd->device == sdev) { 2170 found_evt = evt; 2171 break; 2172 } 2173 } 2174 2175 if (!found_evt) { 2176 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2177 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n"); 2178 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2179 return 0; 2180 } 2181 2182 if (vhost->logged_in) { 2183 evt = ibmvfc_get_event(vhost); 2184 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT); 2185 2186 tmf = &evt->iu.tmf; 2187 memset(tmf, 0, sizeof(*tmf)); 2188 tmf->common.version = 1; 2189 tmf->common.opcode = IBMVFC_TMF_MAD; 2190 tmf->common.length = sizeof(*tmf); 2191 tmf->scsi_id = rport->port_id; 2192 int_to_scsilun(sdev->lun, &tmf->lun); 2193 if (!(vhost->login_buf->resp.capabilities & IBMVFC_CAN_SUPPRESS_ABTS)) 2194 type &= ~IBMVFC_TMF_SUPPRESS_ABTS; 2195 if (vhost->state == IBMVFC_ACTIVE) 2196 tmf->flags = (type | IBMVFC_TMF_LUA_VALID); 2197 else 2198 tmf->flags = ((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID); 2199 tmf->cancel_key = (unsigned long)sdev->hostdata; 2200 tmf->my_cancel_key = (unsigned long)starget->hostdata; 2201 2202 evt->sync_iu = &rsp; 2203 init_completion(&evt->comp); 2204 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2205 } 2206 2207 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2208 2209 if (rsp_rc != 0) { 2210 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc); 2211 return -EIO; 2212 } 2213 2214 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n"); 2215 2216 wait_for_completion(&evt->comp); 2217 status = rsp.mad_common.status; 2218 spin_lock_irqsave(vhost->host->host_lock, flags); 2219 ibmvfc_free_event(evt); 2220 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2221 2222 if (status != IBMVFC_MAD_SUCCESS) { 2223 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status); 2224 return -EIO; 2225 } 2226 2227 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n"); 2228 return 0; 2229 } 2230 2231 /** 2232 * ibmvfc_match_key - Match function for specified cancel key 2233 * @evt: ibmvfc event struct 2234 * @key: cancel key to match 2235 * 2236 * Returns: 2237 * 1 if event matches key / 0 if event does not match key 2238 **/ 2239 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key) 2240 { 2241 unsigned long cancel_key = (unsigned long)key; 2242 2243 if (evt->crq.format == IBMVFC_CMD_FORMAT && 2244 evt->iu.cmd.cancel_key == cancel_key) 2245 return 1; 2246 return 0; 2247 } 2248 2249 /** 2250 * ibmvfc_match_evt - Match function for specified event 2251 * @evt: ibmvfc event struct 2252 * @match: event to match 2253 * 2254 * Returns: 2255 * 1 if event matches key / 0 if event does not match key 2256 **/ 2257 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match) 2258 { 2259 if (evt == match) 2260 return 1; 2261 return 0; 2262 } 2263 2264 /** 2265 * ibmvfc_abort_task_set - Abort outstanding commands to the device 2266 * @sdev: scsi device to abort commands 2267 * 2268 * This sends an Abort Task Set to the VIOS for the specified device. This does 2269 * NOT send any cancel to the VIOS. That must be done separately. 2270 * 2271 * Returns: 2272 * 0 on success / other on failure 2273 **/ 2274 static int ibmvfc_abort_task_set(struct scsi_device *sdev) 2275 { 2276 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2277 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2278 struct ibmvfc_cmd *tmf; 2279 struct ibmvfc_event *evt, *found_evt; 2280 union ibmvfc_iu rsp_iu; 2281 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp; 2282 int rc, rsp_rc = -EBUSY; 2283 unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT; 2284 int rsp_code = 0; 2285 2286 spin_lock_irqsave(vhost->host->host_lock, flags); 2287 found_evt = NULL; 2288 list_for_each_entry(evt, &vhost->sent, queue) { 2289 if (evt->cmnd && evt->cmnd->device == sdev) { 2290 found_evt = evt; 2291 break; 2292 } 2293 } 2294 2295 if (!found_evt) { 2296 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL) 2297 sdev_printk(KERN_INFO, sdev, "No events found to abort\n"); 2298 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2299 return 0; 2300 } 2301 2302 if (vhost->state == IBMVFC_ACTIVE) { 2303 evt = ibmvfc_get_event(vhost); 2304 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT); 2305 2306 tmf = &evt->iu.cmd; 2307 memset(tmf, 0, sizeof(*tmf)); 2308 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp); 2309 tmf->resp.len = sizeof(tmf->rsp); 2310 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE; 2311 tmf->payload_len = sizeof(tmf->iu); 2312 tmf->resp_len = sizeof(tmf->rsp); 2313 tmf->cancel_key = (unsigned long)sdev->hostdata; 2314 tmf->tgt_scsi_id = rport->port_id; 2315 int_to_scsilun(sdev->lun, &tmf->iu.lun); 2316 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF); 2317 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET; 2318 evt->sync_iu = &rsp_iu; 2319 2320 init_completion(&evt->comp); 2321 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout); 2322 } 2323 2324 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2325 2326 if (rsp_rc != 0) { 2327 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc); 2328 return -EIO; 2329 } 2330 2331 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n"); 2332 timeout = wait_for_completion_timeout(&evt->comp, timeout); 2333 2334 if (!timeout) { 2335 rc = ibmvfc_cancel_all(sdev, 0); 2336 if (!rc) { 2337 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); 2338 if (rc == SUCCESS) 2339 rc = 0; 2340 } 2341 2342 if (rc) { 2343 sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n"); 2344 ibmvfc_reset_host(vhost); 2345 rsp_rc = -EIO; 2346 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key); 2347 2348 if (rc == SUCCESS) 2349 rsp_rc = 0; 2350 2351 rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt); 2352 if (rc != SUCCESS) { 2353 spin_lock_irqsave(vhost->host->host_lock, flags); 2354 ibmvfc_hard_reset_host(vhost); 2355 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2356 rsp_rc = 0; 2357 } 2358 2359 goto out; 2360 } 2361 } 2362 2363 if (rsp_iu.cmd.status) 2364 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd); 2365 2366 if (rsp_code) { 2367 if (fc_rsp->flags & FCP_RSP_LEN_VALID) 2368 rsp_code = fc_rsp->data.info.rsp_code; 2369 2370 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) " 2371 "flags: %x fcp_rsp: %x, scsi_status: %x\n", 2372 ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error), 2373 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code, 2374 fc_rsp->scsi_status); 2375 rsp_rc = -EIO; 2376 } else 2377 sdev_printk(KERN_INFO, sdev, "Abort successful\n"); 2378 2379 out: 2380 spin_lock_irqsave(vhost->host->host_lock, flags); 2381 ibmvfc_free_event(evt); 2382 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2383 return rsp_rc; 2384 } 2385 2386 /** 2387 * ibmvfc_eh_abort_handler - Abort a command 2388 * @cmd: scsi command to abort 2389 * 2390 * Returns: 2391 * SUCCESS / FAST_IO_FAIL / FAILED 2392 **/ 2393 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd) 2394 { 2395 struct scsi_device *sdev = cmd->device; 2396 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2397 int cancel_rc, block_rc; 2398 int rc = FAILED; 2399 2400 ENTER; 2401 block_rc = fc_block_scsi_eh(cmd); 2402 ibmvfc_wait_while_resetting(vhost); 2403 if (block_rc != FAST_IO_FAIL) { 2404 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET); 2405 ibmvfc_abort_task_set(sdev); 2406 } else 2407 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2408 2409 if (!cancel_rc) 2410 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); 2411 2412 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2413 rc = FAST_IO_FAIL; 2414 2415 LEAVE; 2416 return rc; 2417 } 2418 2419 /** 2420 * ibmvfc_eh_device_reset_handler - Reset a single LUN 2421 * @cmd: scsi command struct 2422 * 2423 * Returns: 2424 * SUCCESS / FAST_IO_FAIL / FAILED 2425 **/ 2426 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd) 2427 { 2428 struct scsi_device *sdev = cmd->device; 2429 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2430 int cancel_rc, block_rc, reset_rc = 0; 2431 int rc = FAILED; 2432 2433 ENTER; 2434 block_rc = fc_block_scsi_eh(cmd); 2435 ibmvfc_wait_while_resetting(vhost); 2436 if (block_rc != FAST_IO_FAIL) { 2437 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET); 2438 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN"); 2439 } else 2440 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2441 2442 if (!cancel_rc && !reset_rc) 2443 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun); 2444 2445 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2446 rc = FAST_IO_FAIL; 2447 2448 LEAVE; 2449 return rc; 2450 } 2451 2452 /** 2453 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function 2454 * @sdev: scsi device struct 2455 * @data: return code 2456 * 2457 **/ 2458 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data) 2459 { 2460 unsigned long *rc = data; 2461 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2462 } 2463 2464 /** 2465 * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function 2466 * @sdev: scsi device struct 2467 * @data: return code 2468 * 2469 **/ 2470 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data) 2471 { 2472 unsigned long *rc = data; 2473 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET); 2474 } 2475 2476 /** 2477 * ibmvfc_eh_target_reset_handler - Reset the target 2478 * @cmd: scsi command struct 2479 * 2480 * Returns: 2481 * SUCCESS / FAST_IO_FAIL / FAILED 2482 **/ 2483 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd) 2484 { 2485 struct scsi_device *sdev = cmd->device; 2486 struct ibmvfc_host *vhost = shost_priv(sdev->host); 2487 struct scsi_target *starget = scsi_target(sdev); 2488 int block_rc; 2489 int reset_rc = 0; 2490 int rc = FAILED; 2491 unsigned long cancel_rc = 0; 2492 2493 ENTER; 2494 block_rc = fc_block_scsi_eh(cmd); 2495 ibmvfc_wait_while_resetting(vhost); 2496 if (block_rc != FAST_IO_FAIL) { 2497 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset); 2498 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target"); 2499 } else 2500 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset); 2501 2502 if (!cancel_rc && !reset_rc) 2503 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target); 2504 2505 if (block_rc == FAST_IO_FAIL && rc != FAILED) 2506 rc = FAST_IO_FAIL; 2507 2508 LEAVE; 2509 return rc; 2510 } 2511 2512 /** 2513 * ibmvfc_eh_host_reset_handler - Reset the connection to the server 2514 * @cmd: struct scsi_cmnd having problems 2515 * 2516 **/ 2517 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd) 2518 { 2519 int rc, block_rc; 2520 struct ibmvfc_host *vhost = shost_priv(cmd->device->host); 2521 2522 block_rc = fc_block_scsi_eh(cmd); 2523 dev_err(vhost->dev, "Resetting connection due to error recovery\n"); 2524 rc = ibmvfc_issue_fc_host_lip(vhost->host); 2525 2526 if (block_rc == FAST_IO_FAIL) 2527 return FAST_IO_FAIL; 2528 2529 return rc ? FAILED : SUCCESS; 2530 } 2531 2532 /** 2533 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport. 2534 * @rport: rport struct 2535 * 2536 * Return value: 2537 * none 2538 **/ 2539 static void ibmvfc_terminate_rport_io(struct fc_rport *rport) 2540 { 2541 struct Scsi_Host *shost = rport_to_shost(rport); 2542 struct ibmvfc_host *vhost = shost_priv(shost); 2543 struct fc_rport *dev_rport; 2544 struct scsi_device *sdev; 2545 unsigned long rc; 2546 2547 ENTER; 2548 shost_for_each_device(sdev, shost) { 2549 dev_rport = starget_to_rport(scsi_target(sdev)); 2550 if (dev_rport != rport) 2551 continue; 2552 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS); 2553 } 2554 2555 rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport); 2556 2557 if (rc == FAILED) 2558 ibmvfc_issue_fc_host_lip(shost); 2559 LEAVE; 2560 } 2561 2562 static const struct ibmvfc_async_desc ae_desc [] = { 2563 { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 2564 { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 2565 { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 2566 { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 2567 { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 }, 2568 { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL }, 2569 { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL }, 2570 { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL }, 2571 { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL }, 2572 { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL }, 2573 { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL }, 2574 { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL }, 2575 { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL }, 2576 }; 2577 2578 static const struct ibmvfc_async_desc unknown_ae = { 2579 "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL 2580 }; 2581 2582 /** 2583 * ibmvfc_get_ae_desc - Get text description for async event 2584 * @ae: async event 2585 * 2586 **/ 2587 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae) 2588 { 2589 int i; 2590 2591 for (i = 0; i < ARRAY_SIZE(ae_desc); i++) 2592 if (ae_desc[i].ae == ae) 2593 return &ae_desc[i]; 2594 2595 return &unknown_ae; 2596 } 2597 2598 static const struct { 2599 enum ibmvfc_ae_link_state state; 2600 const char *desc; 2601 } link_desc [] = { 2602 { IBMVFC_AE_LS_LINK_UP, " link up" }, 2603 { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" }, 2604 { IBMVFC_AE_LS_LINK_DOWN, " link down" }, 2605 { IBMVFC_AE_LS_LINK_DEAD, " link dead" }, 2606 }; 2607 2608 /** 2609 * ibmvfc_get_link_state - Get text description for link state 2610 * @state: link state 2611 * 2612 **/ 2613 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state) 2614 { 2615 int i; 2616 2617 for (i = 0; i < ARRAY_SIZE(link_desc); i++) 2618 if (link_desc[i].state == state) 2619 return link_desc[i].desc; 2620 2621 return ""; 2622 } 2623 2624 /** 2625 * ibmvfc_handle_async - Handle an async event from the adapter 2626 * @crq: crq to process 2627 * @vhost: ibmvfc host struct 2628 * 2629 **/ 2630 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq, 2631 struct ibmvfc_host *vhost) 2632 { 2633 const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(crq->event); 2634 struct ibmvfc_target *tgt; 2635 2636 ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx," 2637 " node_name: %llx%s\n", desc->desc, crq->scsi_id, crq->wwpn, crq->node_name, 2638 ibmvfc_get_link_state(crq->link_state)); 2639 2640 switch (crq->event) { 2641 case IBMVFC_AE_RESUME: 2642 switch (crq->link_state) { 2643 case IBMVFC_AE_LS_LINK_DOWN: 2644 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 2645 break; 2646 case IBMVFC_AE_LS_LINK_DEAD: 2647 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 2648 break; 2649 case IBMVFC_AE_LS_LINK_UP: 2650 case IBMVFC_AE_LS_LINK_BOUNCED: 2651 default: 2652 vhost->events_to_log |= IBMVFC_AE_LINKUP; 2653 vhost->delay_init = 1; 2654 __ibmvfc_reset_host(vhost); 2655 break; 2656 }; 2657 2658 break; 2659 case IBMVFC_AE_LINK_UP: 2660 vhost->events_to_log |= IBMVFC_AE_LINKUP; 2661 vhost->delay_init = 1; 2662 __ibmvfc_reset_host(vhost); 2663 break; 2664 case IBMVFC_AE_SCN_FABRIC: 2665 case IBMVFC_AE_SCN_DOMAIN: 2666 vhost->events_to_log |= IBMVFC_AE_RSCN; 2667 if (vhost->state < IBMVFC_HALTED) { 2668 vhost->delay_init = 1; 2669 __ibmvfc_reset_host(vhost); 2670 } 2671 break; 2672 case IBMVFC_AE_SCN_NPORT: 2673 case IBMVFC_AE_SCN_GROUP: 2674 vhost->events_to_log |= IBMVFC_AE_RSCN; 2675 ibmvfc_reinit_host(vhost); 2676 break; 2677 case IBMVFC_AE_ELS_LOGO: 2678 case IBMVFC_AE_ELS_PRLO: 2679 case IBMVFC_AE_ELS_PLOGI: 2680 list_for_each_entry(tgt, &vhost->targets, queue) { 2681 if (!crq->scsi_id && !crq->wwpn && !crq->node_name) 2682 break; 2683 if (crq->scsi_id && tgt->scsi_id != crq->scsi_id) 2684 continue; 2685 if (crq->wwpn && tgt->ids.port_name != crq->wwpn) 2686 continue; 2687 if (crq->node_name && tgt->ids.node_name != crq->node_name) 2688 continue; 2689 if (tgt->need_login && crq->event == IBMVFC_AE_ELS_LOGO) 2690 tgt->logo_rcvd = 1; 2691 if (!tgt->need_login || crq->event == IBMVFC_AE_ELS_PLOGI) { 2692 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 2693 ibmvfc_reinit_host(vhost); 2694 } 2695 } 2696 break; 2697 case IBMVFC_AE_LINK_DOWN: 2698 case IBMVFC_AE_ADAPTER_FAILED: 2699 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 2700 break; 2701 case IBMVFC_AE_LINK_DEAD: 2702 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 2703 break; 2704 case IBMVFC_AE_HALT: 2705 ibmvfc_link_down(vhost, IBMVFC_HALTED); 2706 break; 2707 default: 2708 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event); 2709 break; 2710 }; 2711 } 2712 2713 /** 2714 * ibmvfc_handle_crq - Handles and frees received events in the CRQ 2715 * @crq: Command/Response queue 2716 * @vhost: ibmvfc host struct 2717 * 2718 **/ 2719 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost) 2720 { 2721 long rc; 2722 struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba; 2723 2724 switch (crq->valid) { 2725 case IBMVFC_CRQ_INIT_RSP: 2726 switch (crq->format) { 2727 case IBMVFC_CRQ_INIT: 2728 dev_info(vhost->dev, "Partner initialized\n"); 2729 /* Send back a response */ 2730 rc = ibmvfc_send_crq_init_complete(vhost); 2731 if (rc == 0) 2732 ibmvfc_init_host(vhost); 2733 else 2734 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc); 2735 break; 2736 case IBMVFC_CRQ_INIT_COMPLETE: 2737 dev_info(vhost->dev, "Partner initialization complete\n"); 2738 ibmvfc_init_host(vhost); 2739 break; 2740 default: 2741 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format); 2742 } 2743 return; 2744 case IBMVFC_CRQ_XPORT_EVENT: 2745 vhost->state = IBMVFC_NO_CRQ; 2746 vhost->logged_in = 0; 2747 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 2748 if (crq->format == IBMVFC_PARTITION_MIGRATED) { 2749 /* We need to re-setup the interpartition connection */ 2750 dev_info(vhost->dev, "Re-enabling adapter\n"); 2751 vhost->client_migrated = 1; 2752 ibmvfc_purge_requests(vhost, DID_REQUEUE); 2753 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 2754 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE); 2755 } else { 2756 dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format); 2757 ibmvfc_purge_requests(vhost, DID_ERROR); 2758 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 2759 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET); 2760 } 2761 return; 2762 case IBMVFC_CRQ_CMD_RSP: 2763 break; 2764 default: 2765 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid); 2766 return; 2767 } 2768 2769 if (crq->format == IBMVFC_ASYNC_EVENT) 2770 return; 2771 2772 /* The only kind of payload CRQs we should get are responses to 2773 * things we send. Make sure this response is to something we 2774 * actually sent 2775 */ 2776 if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) { 2777 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n", 2778 crq->ioba); 2779 return; 2780 } 2781 2782 if (unlikely(atomic_read(&evt->free))) { 2783 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n", 2784 crq->ioba); 2785 return; 2786 } 2787 2788 del_timer(&evt->timer); 2789 list_del(&evt->queue); 2790 ibmvfc_trc_end(evt); 2791 evt->done(evt); 2792 } 2793 2794 /** 2795 * ibmvfc_scan_finished - Check if the device scan is done. 2796 * @shost: scsi host struct 2797 * @time: current elapsed time 2798 * 2799 * Returns: 2800 * 0 if scan is not done / 1 if scan is done 2801 **/ 2802 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time) 2803 { 2804 unsigned long flags; 2805 struct ibmvfc_host *vhost = shost_priv(shost); 2806 int done = 0; 2807 2808 spin_lock_irqsave(shost->host_lock, flags); 2809 if (time >= (init_timeout * HZ)) { 2810 dev_info(vhost->dev, "Scan taking longer than %d seconds, " 2811 "continuing initialization\n", init_timeout); 2812 done = 1; 2813 } 2814 2815 if (vhost->scan_complete) 2816 done = 1; 2817 spin_unlock_irqrestore(shost->host_lock, flags); 2818 return done; 2819 } 2820 2821 /** 2822 * ibmvfc_slave_alloc - Setup the device's task set value 2823 * @sdev: struct scsi_device device to configure 2824 * 2825 * Set the device's task set value so that error handling works as 2826 * expected. 2827 * 2828 * Returns: 2829 * 0 on success / -ENXIO if device does not exist 2830 **/ 2831 static int ibmvfc_slave_alloc(struct scsi_device *sdev) 2832 { 2833 struct Scsi_Host *shost = sdev->host; 2834 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2835 struct ibmvfc_host *vhost = shost_priv(shost); 2836 unsigned long flags = 0; 2837 2838 if (!rport || fc_remote_port_chkready(rport)) 2839 return -ENXIO; 2840 2841 spin_lock_irqsave(shost->host_lock, flags); 2842 sdev->hostdata = (void *)(unsigned long)vhost->task_set++; 2843 spin_unlock_irqrestore(shost->host_lock, flags); 2844 return 0; 2845 } 2846 2847 /** 2848 * ibmvfc_target_alloc - Setup the target's task set value 2849 * @starget: struct scsi_target 2850 * 2851 * Set the target's task set value so that error handling works as 2852 * expected. 2853 * 2854 * Returns: 2855 * 0 on success / -ENXIO if device does not exist 2856 **/ 2857 static int ibmvfc_target_alloc(struct scsi_target *starget) 2858 { 2859 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 2860 struct ibmvfc_host *vhost = shost_priv(shost); 2861 unsigned long flags = 0; 2862 2863 spin_lock_irqsave(shost->host_lock, flags); 2864 starget->hostdata = (void *)(unsigned long)vhost->task_set++; 2865 spin_unlock_irqrestore(shost->host_lock, flags); 2866 return 0; 2867 } 2868 2869 /** 2870 * ibmvfc_slave_configure - Configure the device 2871 * @sdev: struct scsi_device device to configure 2872 * 2873 * Enable allow_restart for a device if it is a disk. Adjust the 2874 * queue_depth here also. 2875 * 2876 * Returns: 2877 * 0 2878 **/ 2879 static int ibmvfc_slave_configure(struct scsi_device *sdev) 2880 { 2881 struct Scsi_Host *shost = sdev->host; 2882 unsigned long flags = 0; 2883 2884 spin_lock_irqsave(shost->host_lock, flags); 2885 if (sdev->type == TYPE_DISK) 2886 sdev->allow_restart = 1; 2887 2888 if (sdev->tagged_supported) { 2889 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG); 2890 scsi_activate_tcq(sdev, sdev->queue_depth); 2891 } else 2892 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2893 spin_unlock_irqrestore(shost->host_lock, flags); 2894 return 0; 2895 } 2896 2897 /** 2898 * ibmvfc_change_queue_depth - Change the device's queue depth 2899 * @sdev: scsi device struct 2900 * @qdepth: depth to set 2901 * @reason: calling context 2902 * 2903 * Return value: 2904 * actual depth set 2905 **/ 2906 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth, 2907 int reason) 2908 { 2909 if (reason != SCSI_QDEPTH_DEFAULT) 2910 return -EOPNOTSUPP; 2911 2912 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN) 2913 qdepth = IBMVFC_MAX_CMDS_PER_LUN; 2914 2915 scsi_adjust_queue_depth(sdev, 0, qdepth); 2916 return sdev->queue_depth; 2917 } 2918 2919 /** 2920 * ibmvfc_change_queue_type - Change the device's queue type 2921 * @sdev: scsi device struct 2922 * @tag_type: type of tags to use 2923 * 2924 * Return value: 2925 * actual queue type set 2926 **/ 2927 static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type) 2928 { 2929 if (sdev->tagged_supported) { 2930 scsi_set_tag_type(sdev, tag_type); 2931 2932 if (tag_type) 2933 scsi_activate_tcq(sdev, sdev->queue_depth); 2934 else 2935 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2936 } else 2937 tag_type = 0; 2938 2939 return tag_type; 2940 } 2941 2942 static ssize_t ibmvfc_show_host_partition_name(struct device *dev, 2943 struct device_attribute *attr, char *buf) 2944 { 2945 struct Scsi_Host *shost = class_to_shost(dev); 2946 struct ibmvfc_host *vhost = shost_priv(shost); 2947 2948 return snprintf(buf, PAGE_SIZE, "%s\n", 2949 vhost->login_buf->resp.partition_name); 2950 } 2951 2952 static ssize_t ibmvfc_show_host_device_name(struct device *dev, 2953 struct device_attribute *attr, char *buf) 2954 { 2955 struct Scsi_Host *shost = class_to_shost(dev); 2956 struct ibmvfc_host *vhost = shost_priv(shost); 2957 2958 return snprintf(buf, PAGE_SIZE, "%s\n", 2959 vhost->login_buf->resp.device_name); 2960 } 2961 2962 static ssize_t ibmvfc_show_host_loc_code(struct device *dev, 2963 struct device_attribute *attr, char *buf) 2964 { 2965 struct Scsi_Host *shost = class_to_shost(dev); 2966 struct ibmvfc_host *vhost = shost_priv(shost); 2967 2968 return snprintf(buf, PAGE_SIZE, "%s\n", 2969 vhost->login_buf->resp.port_loc_code); 2970 } 2971 2972 static ssize_t ibmvfc_show_host_drc_name(struct device *dev, 2973 struct device_attribute *attr, char *buf) 2974 { 2975 struct Scsi_Host *shost = class_to_shost(dev); 2976 struct ibmvfc_host *vhost = shost_priv(shost); 2977 2978 return snprintf(buf, PAGE_SIZE, "%s\n", 2979 vhost->login_buf->resp.drc_name); 2980 } 2981 2982 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev, 2983 struct device_attribute *attr, char *buf) 2984 { 2985 struct Scsi_Host *shost = class_to_shost(dev); 2986 struct ibmvfc_host *vhost = shost_priv(shost); 2987 return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version); 2988 } 2989 2990 static ssize_t ibmvfc_show_host_capabilities(struct device *dev, 2991 struct device_attribute *attr, char *buf) 2992 { 2993 struct Scsi_Host *shost = class_to_shost(dev); 2994 struct ibmvfc_host *vhost = shost_priv(shost); 2995 return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities); 2996 } 2997 2998 /** 2999 * ibmvfc_show_log_level - Show the adapter's error logging level 3000 * @dev: class device struct 3001 * @buf: buffer 3002 * 3003 * Return value: 3004 * number of bytes printed to buffer 3005 **/ 3006 static ssize_t ibmvfc_show_log_level(struct device *dev, 3007 struct device_attribute *attr, char *buf) 3008 { 3009 struct Scsi_Host *shost = class_to_shost(dev); 3010 struct ibmvfc_host *vhost = shost_priv(shost); 3011 unsigned long flags = 0; 3012 int len; 3013 3014 spin_lock_irqsave(shost->host_lock, flags); 3015 len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level); 3016 spin_unlock_irqrestore(shost->host_lock, flags); 3017 return len; 3018 } 3019 3020 /** 3021 * ibmvfc_store_log_level - Change the adapter's error logging level 3022 * @dev: class device struct 3023 * @buf: buffer 3024 * 3025 * Return value: 3026 * number of bytes printed to buffer 3027 **/ 3028 static ssize_t ibmvfc_store_log_level(struct device *dev, 3029 struct device_attribute *attr, 3030 const char *buf, size_t count) 3031 { 3032 struct Scsi_Host *shost = class_to_shost(dev); 3033 struct ibmvfc_host *vhost = shost_priv(shost); 3034 unsigned long flags = 0; 3035 3036 spin_lock_irqsave(shost->host_lock, flags); 3037 vhost->log_level = simple_strtoul(buf, NULL, 10); 3038 spin_unlock_irqrestore(shost->host_lock, flags); 3039 return strlen(buf); 3040 } 3041 3042 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL); 3043 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL); 3044 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL); 3045 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL); 3046 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL); 3047 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL); 3048 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR, 3049 ibmvfc_show_log_level, ibmvfc_store_log_level); 3050 3051 #ifdef CONFIG_SCSI_IBMVFC_TRACE 3052 /** 3053 * ibmvfc_read_trace - Dump the adapter trace 3054 * @filp: open sysfs file 3055 * @kobj: kobject struct 3056 * @bin_attr: bin_attribute struct 3057 * @buf: buffer 3058 * @off: offset 3059 * @count: buffer size 3060 * 3061 * Return value: 3062 * number of bytes printed to buffer 3063 **/ 3064 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj, 3065 struct bin_attribute *bin_attr, 3066 char *buf, loff_t off, size_t count) 3067 { 3068 struct device *dev = container_of(kobj, struct device, kobj); 3069 struct Scsi_Host *shost = class_to_shost(dev); 3070 struct ibmvfc_host *vhost = shost_priv(shost); 3071 unsigned long flags = 0; 3072 int size = IBMVFC_TRACE_SIZE; 3073 char *src = (char *)vhost->trace; 3074 3075 if (off > size) 3076 return 0; 3077 if (off + count > size) { 3078 size -= off; 3079 count = size; 3080 } 3081 3082 spin_lock_irqsave(shost->host_lock, flags); 3083 memcpy(buf, &src[off], count); 3084 spin_unlock_irqrestore(shost->host_lock, flags); 3085 return count; 3086 } 3087 3088 static struct bin_attribute ibmvfc_trace_attr = { 3089 .attr = { 3090 .name = "trace", 3091 .mode = S_IRUGO, 3092 }, 3093 .size = 0, 3094 .read = ibmvfc_read_trace, 3095 }; 3096 #endif 3097 3098 static struct device_attribute *ibmvfc_attrs[] = { 3099 &dev_attr_partition_name, 3100 &dev_attr_device_name, 3101 &dev_attr_port_loc_code, 3102 &dev_attr_drc_name, 3103 &dev_attr_npiv_version, 3104 &dev_attr_capabilities, 3105 &dev_attr_log_level, 3106 NULL 3107 }; 3108 3109 static struct scsi_host_template driver_template = { 3110 .module = THIS_MODULE, 3111 .name = "IBM POWER Virtual FC Adapter", 3112 .proc_name = IBMVFC_NAME, 3113 .queuecommand = ibmvfc_queuecommand, 3114 .eh_abort_handler = ibmvfc_eh_abort_handler, 3115 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler, 3116 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler, 3117 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler, 3118 .slave_alloc = ibmvfc_slave_alloc, 3119 .slave_configure = ibmvfc_slave_configure, 3120 .target_alloc = ibmvfc_target_alloc, 3121 .scan_finished = ibmvfc_scan_finished, 3122 .change_queue_depth = ibmvfc_change_queue_depth, 3123 .change_queue_type = ibmvfc_change_queue_type, 3124 .cmd_per_lun = 16, 3125 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT, 3126 .this_id = -1, 3127 .sg_tablesize = SG_ALL, 3128 .max_sectors = IBMVFC_MAX_SECTORS, 3129 .use_clustering = ENABLE_CLUSTERING, 3130 .shost_attrs = ibmvfc_attrs, 3131 }; 3132 3133 /** 3134 * ibmvfc_next_async_crq - Returns the next entry in async queue 3135 * @vhost: ibmvfc host struct 3136 * 3137 * Returns: 3138 * Pointer to next entry in queue / NULL if empty 3139 **/ 3140 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost) 3141 { 3142 struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq; 3143 struct ibmvfc_async_crq *crq; 3144 3145 crq = &async_crq->msgs[async_crq->cur]; 3146 if (crq->valid & 0x80) { 3147 if (++async_crq->cur == async_crq->size) 3148 async_crq->cur = 0; 3149 rmb(); 3150 } else 3151 crq = NULL; 3152 3153 return crq; 3154 } 3155 3156 /** 3157 * ibmvfc_next_crq - Returns the next entry in message queue 3158 * @vhost: ibmvfc host struct 3159 * 3160 * Returns: 3161 * Pointer to next entry in queue / NULL if empty 3162 **/ 3163 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost) 3164 { 3165 struct ibmvfc_crq_queue *queue = &vhost->crq; 3166 struct ibmvfc_crq *crq; 3167 3168 crq = &queue->msgs[queue->cur]; 3169 if (crq->valid & 0x80) { 3170 if (++queue->cur == queue->size) 3171 queue->cur = 0; 3172 rmb(); 3173 } else 3174 crq = NULL; 3175 3176 return crq; 3177 } 3178 3179 /** 3180 * ibmvfc_interrupt - Interrupt handler 3181 * @irq: number of irq to handle, not used 3182 * @dev_instance: ibmvfc_host that received interrupt 3183 * 3184 * Returns: 3185 * IRQ_HANDLED 3186 **/ 3187 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance) 3188 { 3189 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance; 3190 unsigned long flags; 3191 3192 spin_lock_irqsave(vhost->host->host_lock, flags); 3193 vio_disable_interrupts(to_vio_dev(vhost->dev)); 3194 tasklet_schedule(&vhost->tasklet); 3195 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3196 return IRQ_HANDLED; 3197 } 3198 3199 /** 3200 * ibmvfc_tasklet - Interrupt handler tasklet 3201 * @data: ibmvfc host struct 3202 * 3203 * Returns: 3204 * Nothing 3205 **/ 3206 static void ibmvfc_tasklet(void *data) 3207 { 3208 struct ibmvfc_host *vhost = data; 3209 struct vio_dev *vdev = to_vio_dev(vhost->dev); 3210 struct ibmvfc_crq *crq; 3211 struct ibmvfc_async_crq *async; 3212 unsigned long flags; 3213 int done = 0; 3214 3215 spin_lock_irqsave(vhost->host->host_lock, flags); 3216 while (!done) { 3217 /* Pull all the valid messages off the async CRQ */ 3218 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 3219 ibmvfc_handle_async(async, vhost); 3220 async->valid = 0; 3221 wmb(); 3222 } 3223 3224 /* Pull all the valid messages off the CRQ */ 3225 while ((crq = ibmvfc_next_crq(vhost)) != NULL) { 3226 ibmvfc_handle_crq(crq, vhost); 3227 crq->valid = 0; 3228 wmb(); 3229 } 3230 3231 vio_enable_interrupts(vdev); 3232 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 3233 vio_disable_interrupts(vdev); 3234 ibmvfc_handle_async(async, vhost); 3235 async->valid = 0; 3236 wmb(); 3237 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) { 3238 vio_disable_interrupts(vdev); 3239 ibmvfc_handle_crq(crq, vhost); 3240 crq->valid = 0; 3241 wmb(); 3242 } else 3243 done = 1; 3244 } 3245 3246 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3247 } 3248 3249 /** 3250 * ibmvfc_init_tgt - Set the next init job step for the target 3251 * @tgt: ibmvfc target struct 3252 * @job_step: job step to perform 3253 * 3254 **/ 3255 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt, 3256 void (*job_step) (struct ibmvfc_target *)) 3257 { 3258 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT); 3259 tgt->job_step = job_step; 3260 wake_up(&tgt->vhost->work_wait_q); 3261 } 3262 3263 /** 3264 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization 3265 * @tgt: ibmvfc target struct 3266 * @job_step: initialization job step 3267 * 3268 * Returns: 1 if step will be retried / 0 if not 3269 * 3270 **/ 3271 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt, 3272 void (*job_step) (struct ibmvfc_target *)) 3273 { 3274 if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) { 3275 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3276 wake_up(&tgt->vhost->work_wait_q); 3277 return 0; 3278 } else 3279 ibmvfc_init_tgt(tgt, job_step); 3280 return 1; 3281 } 3282 3283 /* Defined in FC-LS */ 3284 static const struct { 3285 int code; 3286 int retry; 3287 int logged_in; 3288 } prli_rsp [] = { 3289 { 0, 1, 0 }, 3290 { 1, 0, 1 }, 3291 { 2, 1, 0 }, 3292 { 3, 1, 0 }, 3293 { 4, 0, 0 }, 3294 { 5, 0, 0 }, 3295 { 6, 0, 1 }, 3296 { 7, 0, 0 }, 3297 { 8, 1, 0 }, 3298 }; 3299 3300 /** 3301 * ibmvfc_get_prli_rsp - Find PRLI response index 3302 * @flags: PRLI response flags 3303 * 3304 **/ 3305 static int ibmvfc_get_prli_rsp(u16 flags) 3306 { 3307 int i; 3308 int code = (flags & 0x0f00) >> 8; 3309 3310 for (i = 0; i < ARRAY_SIZE(prli_rsp); i++) 3311 if (prli_rsp[i].code == code) 3312 return i; 3313 3314 return 0; 3315 } 3316 3317 /** 3318 * ibmvfc_tgt_prli_done - Completion handler for Process Login 3319 * @evt: ibmvfc event struct 3320 * 3321 **/ 3322 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt) 3323 { 3324 struct ibmvfc_target *tgt = evt->tgt; 3325 struct ibmvfc_host *vhost = evt->vhost; 3326 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli; 3327 struct ibmvfc_prli_svc_parms *parms = &rsp->parms; 3328 u32 status = rsp->common.status; 3329 int index, level = IBMVFC_DEFAULT_LOG_LEVEL; 3330 3331 vhost->discovery_threads--; 3332 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3333 switch (status) { 3334 case IBMVFC_MAD_SUCCESS: 3335 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n", 3336 parms->type, parms->flags, parms->service_parms); 3337 3338 if (parms->type == IBMVFC_SCSI_FCP_TYPE) { 3339 index = ibmvfc_get_prli_rsp(parms->flags); 3340 if (prli_rsp[index].logged_in) { 3341 if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) { 3342 tgt->need_login = 0; 3343 tgt->ids.roles = 0; 3344 if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC) 3345 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET; 3346 if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC) 3347 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR; 3348 tgt->add_rport = 1; 3349 } else 3350 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3351 } else if (prli_rsp[index].retry) 3352 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 3353 else 3354 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3355 } else 3356 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3357 break; 3358 case IBMVFC_MAD_DRIVER_FAILED: 3359 break; 3360 case IBMVFC_MAD_CRQ_ERROR: 3361 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 3362 break; 3363 case IBMVFC_MAD_FAILED: 3364 default: 3365 if ((rsp->status & IBMVFC_VIOS_FAILURE) && rsp->error == IBMVFC_PLOGI_REQUIRED) 3366 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 3367 else if (tgt->logo_rcvd) 3368 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 3369 else if (ibmvfc_retry_cmd(rsp->status, rsp->error)) 3370 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 3371 else 3372 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3373 3374 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n", 3375 ibmvfc_get_cmd_error(rsp->status, rsp->error), 3376 rsp->status, rsp->error, status); 3377 break; 3378 }; 3379 3380 kref_put(&tgt->kref, ibmvfc_release_tgt); 3381 ibmvfc_free_event(evt); 3382 wake_up(&vhost->work_wait_q); 3383 } 3384 3385 /** 3386 * ibmvfc_tgt_send_prli - Send a process login 3387 * @tgt: ibmvfc target struct 3388 * 3389 **/ 3390 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt) 3391 { 3392 struct ibmvfc_process_login *prli; 3393 struct ibmvfc_host *vhost = tgt->vhost; 3394 struct ibmvfc_event *evt; 3395 3396 if (vhost->discovery_threads >= disc_threads) 3397 return; 3398 3399 kref_get(&tgt->kref); 3400 evt = ibmvfc_get_event(vhost); 3401 vhost->discovery_threads++; 3402 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT); 3403 evt->tgt = tgt; 3404 prli = &evt->iu.prli; 3405 memset(prli, 0, sizeof(*prli)); 3406 prli->common.version = 1; 3407 prli->common.opcode = IBMVFC_PROCESS_LOGIN; 3408 prli->common.length = sizeof(*prli); 3409 prli->scsi_id = tgt->scsi_id; 3410 3411 prli->parms.type = IBMVFC_SCSI_FCP_TYPE; 3412 prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR; 3413 prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC; 3414 3415 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 3416 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 3417 vhost->discovery_threads--; 3418 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3419 kref_put(&tgt->kref, ibmvfc_release_tgt); 3420 } else 3421 tgt_dbg(tgt, "Sent process login\n"); 3422 } 3423 3424 /** 3425 * ibmvfc_tgt_plogi_done - Completion handler for Port Login 3426 * @evt: ibmvfc event struct 3427 * 3428 **/ 3429 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt) 3430 { 3431 struct ibmvfc_target *tgt = evt->tgt; 3432 struct ibmvfc_host *vhost = evt->vhost; 3433 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi; 3434 u32 status = rsp->common.status; 3435 int level = IBMVFC_DEFAULT_LOG_LEVEL; 3436 3437 vhost->discovery_threads--; 3438 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3439 switch (status) { 3440 case IBMVFC_MAD_SUCCESS: 3441 tgt_dbg(tgt, "Port Login succeeded\n"); 3442 if (tgt->ids.port_name && 3443 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) { 3444 vhost->reinit = 1; 3445 tgt_dbg(tgt, "Port re-init required\n"); 3446 break; 3447 } 3448 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name); 3449 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name); 3450 tgt->ids.port_id = tgt->scsi_id; 3451 memcpy(&tgt->service_parms, &rsp->service_parms, 3452 sizeof(tgt->service_parms)); 3453 memcpy(&tgt->service_parms_change, &rsp->service_parms_change, 3454 sizeof(tgt->service_parms_change)); 3455 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli); 3456 break; 3457 case IBMVFC_MAD_DRIVER_FAILED: 3458 break; 3459 case IBMVFC_MAD_CRQ_ERROR: 3460 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 3461 break; 3462 case IBMVFC_MAD_FAILED: 3463 default: 3464 if (ibmvfc_retry_cmd(rsp->status, rsp->error)) 3465 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 3466 else 3467 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3468 3469 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 3470 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error, 3471 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type, 3472 ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status); 3473 break; 3474 }; 3475 3476 kref_put(&tgt->kref, ibmvfc_release_tgt); 3477 ibmvfc_free_event(evt); 3478 wake_up(&vhost->work_wait_q); 3479 } 3480 3481 /** 3482 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target 3483 * @tgt: ibmvfc target struct 3484 * 3485 **/ 3486 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt) 3487 { 3488 struct ibmvfc_port_login *plogi; 3489 struct ibmvfc_host *vhost = tgt->vhost; 3490 struct ibmvfc_event *evt; 3491 3492 if (vhost->discovery_threads >= disc_threads) 3493 return; 3494 3495 kref_get(&tgt->kref); 3496 tgt->logo_rcvd = 0; 3497 evt = ibmvfc_get_event(vhost); 3498 vhost->discovery_threads++; 3499 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 3500 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT); 3501 evt->tgt = tgt; 3502 plogi = &evt->iu.plogi; 3503 memset(plogi, 0, sizeof(*plogi)); 3504 plogi->common.version = 1; 3505 plogi->common.opcode = IBMVFC_PORT_LOGIN; 3506 plogi->common.length = sizeof(*plogi); 3507 plogi->scsi_id = tgt->scsi_id; 3508 3509 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 3510 vhost->discovery_threads--; 3511 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3512 kref_put(&tgt->kref, ibmvfc_release_tgt); 3513 } else 3514 tgt_dbg(tgt, "Sent port login\n"); 3515 } 3516 3517 /** 3518 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD 3519 * @evt: ibmvfc event struct 3520 * 3521 **/ 3522 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt) 3523 { 3524 struct ibmvfc_target *tgt = evt->tgt; 3525 struct ibmvfc_host *vhost = evt->vhost; 3526 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout; 3527 u32 status = rsp->common.status; 3528 3529 vhost->discovery_threads--; 3530 ibmvfc_free_event(evt); 3531 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3532 3533 switch (status) { 3534 case IBMVFC_MAD_SUCCESS: 3535 tgt_dbg(tgt, "Implicit Logout succeeded\n"); 3536 break; 3537 case IBMVFC_MAD_DRIVER_FAILED: 3538 kref_put(&tgt->kref, ibmvfc_release_tgt); 3539 wake_up(&vhost->work_wait_q); 3540 return; 3541 case IBMVFC_MAD_FAILED: 3542 default: 3543 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status); 3544 break; 3545 }; 3546 3547 if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT) 3548 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi); 3549 else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS && 3550 tgt->scsi_id != tgt->new_scsi_id) 3551 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3552 kref_put(&tgt->kref, ibmvfc_release_tgt); 3553 wake_up(&vhost->work_wait_q); 3554 } 3555 3556 /** 3557 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target 3558 * @tgt: ibmvfc target struct 3559 * 3560 **/ 3561 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt) 3562 { 3563 struct ibmvfc_implicit_logout *mad; 3564 struct ibmvfc_host *vhost = tgt->vhost; 3565 struct ibmvfc_event *evt; 3566 3567 if (vhost->discovery_threads >= disc_threads) 3568 return; 3569 3570 kref_get(&tgt->kref); 3571 evt = ibmvfc_get_event(vhost); 3572 vhost->discovery_threads++; 3573 ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT); 3574 evt->tgt = tgt; 3575 mad = &evt->iu.implicit_logout; 3576 memset(mad, 0, sizeof(*mad)); 3577 mad->common.version = 1; 3578 mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT; 3579 mad->common.length = sizeof(*mad); 3580 mad->old_scsi_id = tgt->scsi_id; 3581 3582 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 3583 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 3584 vhost->discovery_threads--; 3585 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3586 kref_put(&tgt->kref, ibmvfc_release_tgt); 3587 } else 3588 tgt_dbg(tgt, "Sent Implicit Logout\n"); 3589 } 3590 3591 /** 3592 * ibmvfc_adisc_needs_plogi - Does device need PLOGI? 3593 * @mad: ibmvfc passthru mad struct 3594 * @tgt: ibmvfc target struct 3595 * 3596 * Returns: 3597 * 1 if PLOGI needed / 0 if PLOGI not needed 3598 **/ 3599 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad, 3600 struct ibmvfc_target *tgt) 3601 { 3602 if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name, 3603 sizeof(tgt->ids.port_name))) 3604 return 1; 3605 if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name, 3606 sizeof(tgt->ids.node_name))) 3607 return 1; 3608 if (mad->fc_iu.response[6] != tgt->scsi_id) 3609 return 1; 3610 return 0; 3611 } 3612 3613 /** 3614 * ibmvfc_tgt_adisc_done - Completion handler for ADISC 3615 * @evt: ibmvfc event struct 3616 * 3617 **/ 3618 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt) 3619 { 3620 struct ibmvfc_target *tgt = evt->tgt; 3621 struct ibmvfc_host *vhost = evt->vhost; 3622 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru; 3623 u32 status = mad->common.status; 3624 u8 fc_reason, fc_explain; 3625 3626 vhost->discovery_threads--; 3627 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3628 del_timer(&tgt->timer); 3629 3630 switch (status) { 3631 case IBMVFC_MAD_SUCCESS: 3632 tgt_dbg(tgt, "ADISC succeeded\n"); 3633 if (ibmvfc_adisc_needs_plogi(mad, tgt)) 3634 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3635 break; 3636 case IBMVFC_MAD_DRIVER_FAILED: 3637 break; 3638 case IBMVFC_MAD_FAILED: 3639 default: 3640 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3641 fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16; 3642 fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8; 3643 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 3644 ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error), 3645 mad->iu.status, mad->iu.error, 3646 ibmvfc_get_fc_type(fc_reason), fc_reason, 3647 ibmvfc_get_ls_explain(fc_explain), fc_explain, status); 3648 break; 3649 }; 3650 3651 kref_put(&tgt->kref, ibmvfc_release_tgt); 3652 ibmvfc_free_event(evt); 3653 wake_up(&vhost->work_wait_q); 3654 } 3655 3656 /** 3657 * ibmvfc_init_passthru - Initialize an event struct for FC passthru 3658 * @evt: ibmvfc event struct 3659 * 3660 **/ 3661 static void ibmvfc_init_passthru(struct ibmvfc_event *evt) 3662 { 3663 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru; 3664 3665 memset(mad, 0, sizeof(*mad)); 3666 mad->common.version = 1; 3667 mad->common.opcode = IBMVFC_PASSTHRU; 3668 mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu); 3669 mad->cmd_ioba.va = (u64)evt->crq.ioba + 3670 offsetof(struct ibmvfc_passthru_mad, iu); 3671 mad->cmd_ioba.len = sizeof(mad->iu); 3672 mad->iu.cmd_len = sizeof(mad->fc_iu.payload); 3673 mad->iu.rsp_len = sizeof(mad->fc_iu.response); 3674 mad->iu.cmd.va = (u64)evt->crq.ioba + 3675 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 3676 offsetof(struct ibmvfc_passthru_fc_iu, payload); 3677 mad->iu.cmd.len = sizeof(mad->fc_iu.payload); 3678 mad->iu.rsp.va = (u64)evt->crq.ioba + 3679 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 3680 offsetof(struct ibmvfc_passthru_fc_iu, response); 3681 mad->iu.rsp.len = sizeof(mad->fc_iu.response); 3682 } 3683 3684 /** 3685 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC 3686 * @evt: ibmvfc event struct 3687 * 3688 * Just cleanup this event struct. Everything else is handled by 3689 * the ADISC completion handler. If the ADISC never actually comes 3690 * back, we still have the timer running on the ADISC event struct 3691 * which will fire and cause the CRQ to get reset. 3692 * 3693 **/ 3694 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt) 3695 { 3696 struct ibmvfc_host *vhost = evt->vhost; 3697 struct ibmvfc_target *tgt = evt->tgt; 3698 3699 tgt_dbg(tgt, "ADISC cancel complete\n"); 3700 vhost->abort_threads--; 3701 ibmvfc_free_event(evt); 3702 kref_put(&tgt->kref, ibmvfc_release_tgt); 3703 wake_up(&vhost->work_wait_q); 3704 } 3705 3706 /** 3707 * ibmvfc_adisc_timeout - Handle an ADISC timeout 3708 * @tgt: ibmvfc target struct 3709 * 3710 * If an ADISC times out, send a cancel. If the cancel times 3711 * out, reset the CRQ. When the ADISC comes back as cancelled, 3712 * log back into the target. 3713 **/ 3714 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt) 3715 { 3716 struct ibmvfc_host *vhost = tgt->vhost; 3717 struct ibmvfc_event *evt; 3718 struct ibmvfc_tmf *tmf; 3719 unsigned long flags; 3720 int rc; 3721 3722 tgt_dbg(tgt, "ADISC timeout\n"); 3723 spin_lock_irqsave(vhost->host->host_lock, flags); 3724 if (vhost->abort_threads >= disc_threads || 3725 tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT || 3726 vhost->state != IBMVFC_INITIALIZING || 3727 vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) { 3728 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3729 return; 3730 } 3731 3732 vhost->abort_threads++; 3733 kref_get(&tgt->kref); 3734 evt = ibmvfc_get_event(vhost); 3735 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT); 3736 3737 evt->tgt = tgt; 3738 tmf = &evt->iu.tmf; 3739 memset(tmf, 0, sizeof(*tmf)); 3740 tmf->common.version = 1; 3741 tmf->common.opcode = IBMVFC_TMF_MAD; 3742 tmf->common.length = sizeof(*tmf); 3743 tmf->scsi_id = tgt->scsi_id; 3744 tmf->cancel_key = tgt->cancel_key; 3745 3746 rc = ibmvfc_send_event(evt, vhost, default_timeout); 3747 3748 if (rc) { 3749 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc); 3750 vhost->abort_threads--; 3751 kref_put(&tgt->kref, ibmvfc_release_tgt); 3752 __ibmvfc_reset_host(vhost); 3753 } else 3754 tgt_dbg(tgt, "Attempting to cancel ADISC\n"); 3755 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3756 } 3757 3758 /** 3759 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target 3760 * @tgt: ibmvfc target struct 3761 * 3762 * When sending an ADISC we end up with two timers running. The 3763 * first timer is the timer in the ibmvfc target struct. If this 3764 * fires, we send a cancel to the target. The second timer is the 3765 * timer on the ibmvfc event for the ADISC, which is longer. If that 3766 * fires, it means the ADISC timed out and our attempt to cancel it 3767 * also failed, so we need to reset the CRQ. 3768 **/ 3769 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt) 3770 { 3771 struct ibmvfc_passthru_mad *mad; 3772 struct ibmvfc_host *vhost = tgt->vhost; 3773 struct ibmvfc_event *evt; 3774 3775 if (vhost->discovery_threads >= disc_threads) 3776 return; 3777 3778 kref_get(&tgt->kref); 3779 evt = ibmvfc_get_event(vhost); 3780 vhost->discovery_threads++; 3781 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT); 3782 evt->tgt = tgt; 3783 3784 ibmvfc_init_passthru(evt); 3785 mad = &evt->iu.passthru; 3786 mad->iu.flags = IBMVFC_FC_ELS; 3787 mad->iu.scsi_id = tgt->scsi_id; 3788 mad->iu.cancel_key = tgt->cancel_key; 3789 3790 mad->fc_iu.payload[0] = IBMVFC_ADISC; 3791 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name, 3792 sizeof(vhost->login_buf->resp.port_name)); 3793 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name, 3794 sizeof(vhost->login_buf->resp.node_name)); 3795 mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff; 3796 3797 if (timer_pending(&tgt->timer)) 3798 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ)); 3799 else { 3800 tgt->timer.data = (unsigned long) tgt; 3801 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ); 3802 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout; 3803 add_timer(&tgt->timer); 3804 } 3805 3806 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 3807 if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) { 3808 vhost->discovery_threads--; 3809 del_timer(&tgt->timer); 3810 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3811 kref_put(&tgt->kref, ibmvfc_release_tgt); 3812 } else 3813 tgt_dbg(tgt, "Sent ADISC\n"); 3814 } 3815 3816 /** 3817 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD 3818 * @evt: ibmvfc event struct 3819 * 3820 **/ 3821 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt) 3822 { 3823 struct ibmvfc_target *tgt = evt->tgt; 3824 struct ibmvfc_host *vhost = evt->vhost; 3825 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt; 3826 u32 status = rsp->common.status; 3827 int level = IBMVFC_DEFAULT_LOG_LEVEL; 3828 3829 vhost->discovery_threads--; 3830 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3831 switch (status) { 3832 case IBMVFC_MAD_SUCCESS: 3833 tgt_dbg(tgt, "Query Target succeeded\n"); 3834 tgt->new_scsi_id = rsp->scsi_id; 3835 if (rsp->scsi_id != tgt->scsi_id) 3836 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 3837 else 3838 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc); 3839 break; 3840 case IBMVFC_MAD_DRIVER_FAILED: 3841 break; 3842 case IBMVFC_MAD_CRQ_ERROR: 3843 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 3844 break; 3845 case IBMVFC_MAD_FAILED: 3846 default: 3847 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED && 3848 rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ && 3849 rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG) 3850 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3851 else if (ibmvfc_retry_cmd(rsp->status, rsp->error)) 3852 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 3853 else 3854 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3855 3856 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 3857 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error, 3858 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type, 3859 ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status); 3860 break; 3861 }; 3862 3863 kref_put(&tgt->kref, ibmvfc_release_tgt); 3864 ibmvfc_free_event(evt); 3865 wake_up(&vhost->work_wait_q); 3866 } 3867 3868 /** 3869 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target 3870 * @tgt: ibmvfc target struct 3871 * 3872 **/ 3873 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt) 3874 { 3875 struct ibmvfc_query_tgt *query_tgt; 3876 struct ibmvfc_host *vhost = tgt->vhost; 3877 struct ibmvfc_event *evt; 3878 3879 if (vhost->discovery_threads >= disc_threads) 3880 return; 3881 3882 kref_get(&tgt->kref); 3883 evt = ibmvfc_get_event(vhost); 3884 vhost->discovery_threads++; 3885 evt->tgt = tgt; 3886 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT); 3887 query_tgt = &evt->iu.query_tgt; 3888 memset(query_tgt, 0, sizeof(*query_tgt)); 3889 query_tgt->common.version = 1; 3890 query_tgt->common.opcode = IBMVFC_QUERY_TARGET; 3891 query_tgt->common.length = sizeof(*query_tgt); 3892 query_tgt->wwpn = tgt->ids.port_name; 3893 3894 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 3895 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 3896 vhost->discovery_threads--; 3897 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3898 kref_put(&tgt->kref, ibmvfc_release_tgt); 3899 } else 3900 tgt_dbg(tgt, "Sent Query Target\n"); 3901 } 3902 3903 /** 3904 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target 3905 * @vhost: ibmvfc host struct 3906 * @scsi_id: SCSI ID to allocate target for 3907 * 3908 * Returns: 3909 * 0 on success / other on failure 3910 **/ 3911 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id) 3912 { 3913 struct ibmvfc_target *tgt; 3914 unsigned long flags; 3915 3916 spin_lock_irqsave(vhost->host->host_lock, flags); 3917 list_for_each_entry(tgt, &vhost->targets, queue) { 3918 if (tgt->scsi_id == scsi_id) { 3919 if (tgt->need_login) 3920 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 3921 goto unlock_out; 3922 } 3923 } 3924 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3925 3926 tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO); 3927 if (!tgt) { 3928 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n", 3929 scsi_id); 3930 return -ENOMEM; 3931 } 3932 3933 memset(tgt, 0, sizeof(*tgt)); 3934 tgt->scsi_id = scsi_id; 3935 tgt->new_scsi_id = scsi_id; 3936 tgt->vhost = vhost; 3937 tgt->need_login = 1; 3938 tgt->cancel_key = vhost->task_set++; 3939 init_timer(&tgt->timer); 3940 kref_init(&tgt->kref); 3941 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 3942 spin_lock_irqsave(vhost->host->host_lock, flags); 3943 list_add_tail(&tgt->queue, &vhost->targets); 3944 3945 unlock_out: 3946 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3947 return 0; 3948 } 3949 3950 /** 3951 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets 3952 * @vhost: ibmvfc host struct 3953 * 3954 * Returns: 3955 * 0 on success / other on failure 3956 **/ 3957 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost) 3958 { 3959 int i, rc; 3960 3961 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++) 3962 rc = ibmvfc_alloc_target(vhost, 3963 vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK); 3964 3965 return rc; 3966 } 3967 3968 /** 3969 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD 3970 * @evt: ibmvfc event struct 3971 * 3972 **/ 3973 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt) 3974 { 3975 struct ibmvfc_host *vhost = evt->vhost; 3976 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets; 3977 u32 mad_status = rsp->common.status; 3978 int level = IBMVFC_DEFAULT_LOG_LEVEL; 3979 3980 switch (mad_status) { 3981 case IBMVFC_MAD_SUCCESS: 3982 ibmvfc_dbg(vhost, "Discover Targets succeeded\n"); 3983 vhost->num_targets = rsp->num_written; 3984 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS); 3985 break; 3986 case IBMVFC_MAD_FAILED: 3987 level += ibmvfc_retry_host_init(vhost); 3988 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n", 3989 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error); 3990 break; 3991 case IBMVFC_MAD_DRIVER_FAILED: 3992 break; 3993 default: 3994 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status); 3995 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3996 break; 3997 } 3998 3999 ibmvfc_free_event(evt); 4000 wake_up(&vhost->work_wait_q); 4001 } 4002 4003 /** 4004 * ibmvfc_discover_targets - Send Discover Targets MAD 4005 * @vhost: ibmvfc host struct 4006 * 4007 **/ 4008 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost) 4009 { 4010 struct ibmvfc_discover_targets *mad; 4011 struct ibmvfc_event *evt = ibmvfc_get_event(vhost); 4012 4013 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT); 4014 mad = &evt->iu.discover_targets; 4015 memset(mad, 0, sizeof(*mad)); 4016 mad->common.version = 1; 4017 mad->common.opcode = IBMVFC_DISC_TARGETS; 4018 mad->common.length = sizeof(*mad); 4019 mad->bufflen = vhost->disc_buf_sz; 4020 mad->buffer.va = vhost->disc_buf_dma; 4021 mad->buffer.len = vhost->disc_buf_sz; 4022 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 4023 4024 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 4025 ibmvfc_dbg(vhost, "Sent discover targets\n"); 4026 else 4027 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4028 } 4029 4030 /** 4031 * ibmvfc_npiv_login_done - Completion handler for NPIV Login 4032 * @evt: ibmvfc event struct 4033 * 4034 **/ 4035 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt) 4036 { 4037 struct ibmvfc_host *vhost = evt->vhost; 4038 u32 mad_status = evt->xfer_iu->npiv_login.common.status; 4039 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp; 4040 unsigned int npiv_max_sectors; 4041 int level = IBMVFC_DEFAULT_LOG_LEVEL; 4042 4043 switch (mad_status) { 4044 case IBMVFC_MAD_SUCCESS: 4045 ibmvfc_free_event(evt); 4046 break; 4047 case IBMVFC_MAD_FAILED: 4048 if (ibmvfc_retry_cmd(rsp->status, rsp->error)) 4049 level += ibmvfc_retry_host_init(vhost); 4050 else 4051 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4052 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n", 4053 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error); 4054 ibmvfc_free_event(evt); 4055 return; 4056 case IBMVFC_MAD_CRQ_ERROR: 4057 ibmvfc_retry_host_init(vhost); 4058 case IBMVFC_MAD_DRIVER_FAILED: 4059 ibmvfc_free_event(evt); 4060 return; 4061 default: 4062 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status); 4063 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4064 ibmvfc_free_event(evt); 4065 return; 4066 } 4067 4068 vhost->client_migrated = 0; 4069 4070 if (!(rsp->flags & IBMVFC_NATIVE_FC)) { 4071 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n", 4072 rsp->flags); 4073 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4074 wake_up(&vhost->work_wait_q); 4075 return; 4076 } 4077 4078 if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) { 4079 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n", 4080 rsp->max_cmds); 4081 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4082 wake_up(&vhost->work_wait_q); 4083 return; 4084 } 4085 4086 vhost->logged_in = 1; 4087 npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS); 4088 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n", 4089 rsp->partition_name, rsp->device_name, rsp->port_loc_code, 4090 rsp->drc_name, npiv_max_sectors); 4091 4092 fc_host_fabric_name(vhost->host) = rsp->node_name; 4093 fc_host_node_name(vhost->host) = rsp->node_name; 4094 fc_host_port_name(vhost->host) = rsp->port_name; 4095 fc_host_port_id(vhost->host) = rsp->scsi_id; 4096 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV; 4097 fc_host_supported_classes(vhost->host) = 0; 4098 if (rsp->service_parms.class1_parms[0] & 0x80000000) 4099 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1; 4100 if (rsp->service_parms.class2_parms[0] & 0x80000000) 4101 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2; 4102 if (rsp->service_parms.class3_parms[0] & 0x80000000) 4103 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3; 4104 fc_host_maxframe_size(vhost->host) = 4105 rsp->service_parms.common.bb_rcv_sz & 0x0fff; 4106 4107 vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ; 4108 vhost->host->max_sectors = npiv_max_sectors; 4109 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 4110 wake_up(&vhost->work_wait_q); 4111 } 4112 4113 /** 4114 * ibmvfc_npiv_login - Sends NPIV login 4115 * @vhost: ibmvfc host struct 4116 * 4117 **/ 4118 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost) 4119 { 4120 struct ibmvfc_npiv_login_mad *mad; 4121 struct ibmvfc_event *evt = ibmvfc_get_event(vhost); 4122 4123 ibmvfc_gather_partition_info(vhost); 4124 ibmvfc_set_login_info(vhost); 4125 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT); 4126 4127 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info)); 4128 mad = &evt->iu.npiv_login; 4129 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad)); 4130 mad->common.version = 1; 4131 mad->common.opcode = IBMVFC_NPIV_LOGIN; 4132 mad->common.length = sizeof(struct ibmvfc_npiv_login_mad); 4133 mad->buffer.va = vhost->login_buf_dma; 4134 mad->buffer.len = sizeof(*vhost->login_buf); 4135 4136 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 4137 4138 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 4139 ibmvfc_dbg(vhost, "Sent NPIV login\n"); 4140 else 4141 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4142 }; 4143 4144 /** 4145 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout 4146 * @vhost: ibmvfc host struct 4147 * 4148 **/ 4149 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt) 4150 { 4151 struct ibmvfc_host *vhost = evt->vhost; 4152 u32 mad_status = evt->xfer_iu->npiv_logout.common.status; 4153 4154 ibmvfc_free_event(evt); 4155 4156 switch (mad_status) { 4157 case IBMVFC_MAD_SUCCESS: 4158 if (list_empty(&vhost->sent) && 4159 vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) { 4160 ibmvfc_init_host(vhost); 4161 return; 4162 } 4163 break; 4164 case IBMVFC_MAD_FAILED: 4165 case IBMVFC_MAD_NOT_SUPPORTED: 4166 case IBMVFC_MAD_CRQ_ERROR: 4167 case IBMVFC_MAD_DRIVER_FAILED: 4168 default: 4169 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status); 4170 break; 4171 } 4172 4173 ibmvfc_hard_reset_host(vhost); 4174 } 4175 4176 /** 4177 * ibmvfc_npiv_logout - Issue an NPIV Logout 4178 * @vhost: ibmvfc host struct 4179 * 4180 **/ 4181 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost) 4182 { 4183 struct ibmvfc_npiv_logout_mad *mad; 4184 struct ibmvfc_event *evt; 4185 4186 evt = ibmvfc_get_event(vhost); 4187 ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT); 4188 4189 mad = &evt->iu.npiv_logout; 4190 memset(mad, 0, sizeof(*mad)); 4191 mad->common.version = 1; 4192 mad->common.opcode = IBMVFC_NPIV_LOGOUT; 4193 mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad); 4194 4195 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT); 4196 4197 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 4198 ibmvfc_dbg(vhost, "Sent NPIV logout\n"); 4199 else 4200 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4201 } 4202 4203 /** 4204 * ibmvfc_dev_init_to_do - Is there target initialization work to do? 4205 * @vhost: ibmvfc host struct 4206 * 4207 * Returns: 4208 * 1 if work to do / 0 if not 4209 **/ 4210 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost) 4211 { 4212 struct ibmvfc_target *tgt; 4213 4214 list_for_each_entry(tgt, &vhost->targets, queue) { 4215 if (tgt->action == IBMVFC_TGT_ACTION_INIT || 4216 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 4217 return 1; 4218 } 4219 4220 return 0; 4221 } 4222 4223 /** 4224 * __ibmvfc_work_to_do - Is there task level work to do? (no locking) 4225 * @vhost: ibmvfc host struct 4226 * 4227 * Returns: 4228 * 1 if work to do / 0 if not 4229 **/ 4230 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost) 4231 { 4232 struct ibmvfc_target *tgt; 4233 4234 if (kthread_should_stop()) 4235 return 1; 4236 switch (vhost->action) { 4237 case IBMVFC_HOST_ACTION_NONE: 4238 case IBMVFC_HOST_ACTION_INIT_WAIT: 4239 case IBMVFC_HOST_ACTION_LOGO_WAIT: 4240 return 0; 4241 case IBMVFC_HOST_ACTION_TGT_INIT: 4242 case IBMVFC_HOST_ACTION_QUERY_TGTS: 4243 if (vhost->discovery_threads == disc_threads) 4244 return 0; 4245 list_for_each_entry(tgt, &vhost->targets, queue) 4246 if (tgt->action == IBMVFC_TGT_ACTION_INIT) 4247 return 1; 4248 list_for_each_entry(tgt, &vhost->targets, queue) 4249 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 4250 return 0; 4251 return 1; 4252 case IBMVFC_HOST_ACTION_LOGO: 4253 case IBMVFC_HOST_ACTION_INIT: 4254 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 4255 case IBMVFC_HOST_ACTION_TGT_DEL: 4256 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 4257 case IBMVFC_HOST_ACTION_QUERY: 4258 case IBMVFC_HOST_ACTION_RESET: 4259 case IBMVFC_HOST_ACTION_REENABLE: 4260 default: 4261 break; 4262 }; 4263 4264 return 1; 4265 } 4266 4267 /** 4268 * ibmvfc_work_to_do - Is there task level work to do? 4269 * @vhost: ibmvfc host struct 4270 * 4271 * Returns: 4272 * 1 if work to do / 0 if not 4273 **/ 4274 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost) 4275 { 4276 unsigned long flags; 4277 int rc; 4278 4279 spin_lock_irqsave(vhost->host->host_lock, flags); 4280 rc = __ibmvfc_work_to_do(vhost); 4281 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4282 return rc; 4283 } 4284 4285 /** 4286 * ibmvfc_log_ae - Log async events if necessary 4287 * @vhost: ibmvfc host struct 4288 * @events: events to log 4289 * 4290 **/ 4291 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events) 4292 { 4293 if (events & IBMVFC_AE_RSCN) 4294 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0); 4295 if ((events & IBMVFC_AE_LINKDOWN) && 4296 vhost->state >= IBMVFC_HALTED) 4297 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0); 4298 if ((events & IBMVFC_AE_LINKUP) && 4299 vhost->state == IBMVFC_INITIALIZING) 4300 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0); 4301 } 4302 4303 /** 4304 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port 4305 * @tgt: ibmvfc target struct 4306 * 4307 **/ 4308 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt) 4309 { 4310 struct ibmvfc_host *vhost = tgt->vhost; 4311 struct fc_rport *rport; 4312 unsigned long flags; 4313 4314 tgt_dbg(tgt, "Adding rport\n"); 4315 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids); 4316 spin_lock_irqsave(vhost->host->host_lock, flags); 4317 4318 if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { 4319 tgt_dbg(tgt, "Deleting rport\n"); 4320 list_del(&tgt->queue); 4321 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT); 4322 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4323 fc_remote_port_delete(rport); 4324 del_timer_sync(&tgt->timer); 4325 kref_put(&tgt->kref, ibmvfc_release_tgt); 4326 return; 4327 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) { 4328 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4329 return; 4330 } 4331 4332 if (rport) { 4333 tgt_dbg(tgt, "rport add succeeded\n"); 4334 tgt->rport = rport; 4335 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff; 4336 rport->supported_classes = 0; 4337 tgt->target_id = rport->scsi_target_id; 4338 if (tgt->service_parms.class1_parms[0] & 0x80000000) 4339 rport->supported_classes |= FC_COS_CLASS1; 4340 if (tgt->service_parms.class2_parms[0] & 0x80000000) 4341 rport->supported_classes |= FC_COS_CLASS2; 4342 if (tgt->service_parms.class3_parms[0] & 0x80000000) 4343 rport->supported_classes |= FC_COS_CLASS3; 4344 if (rport->rqst_q) 4345 blk_queue_max_segments(rport->rqst_q, 1); 4346 } else 4347 tgt_dbg(tgt, "rport add failed\n"); 4348 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4349 } 4350 4351 /** 4352 * ibmvfc_do_work - Do task level work 4353 * @vhost: ibmvfc host struct 4354 * 4355 **/ 4356 static void ibmvfc_do_work(struct ibmvfc_host *vhost) 4357 { 4358 struct ibmvfc_target *tgt; 4359 unsigned long flags; 4360 struct fc_rport *rport; 4361 int rc; 4362 4363 ibmvfc_log_ae(vhost, vhost->events_to_log); 4364 spin_lock_irqsave(vhost->host->host_lock, flags); 4365 vhost->events_to_log = 0; 4366 switch (vhost->action) { 4367 case IBMVFC_HOST_ACTION_NONE: 4368 case IBMVFC_HOST_ACTION_LOGO_WAIT: 4369 case IBMVFC_HOST_ACTION_INIT_WAIT: 4370 break; 4371 case IBMVFC_HOST_ACTION_RESET: 4372 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL; 4373 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4374 rc = ibmvfc_reset_crq(vhost); 4375 spin_lock_irqsave(vhost->host->host_lock, flags); 4376 if (rc == H_CLOSED) 4377 vio_enable_interrupts(to_vio_dev(vhost->dev)); 4378 if (rc || (rc = ibmvfc_send_crq_init(vhost)) || 4379 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) { 4380 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4381 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc); 4382 } 4383 break; 4384 case IBMVFC_HOST_ACTION_REENABLE: 4385 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL; 4386 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4387 rc = ibmvfc_reenable_crq_queue(vhost); 4388 spin_lock_irqsave(vhost->host->host_lock, flags); 4389 if (rc || (rc = ibmvfc_send_crq_init(vhost))) { 4390 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 4391 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc); 4392 } 4393 break; 4394 case IBMVFC_HOST_ACTION_LOGO: 4395 vhost->job_step(vhost); 4396 break; 4397 case IBMVFC_HOST_ACTION_INIT: 4398 BUG_ON(vhost->state != IBMVFC_INITIALIZING); 4399 if (vhost->delay_init) { 4400 vhost->delay_init = 0; 4401 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4402 ssleep(15); 4403 return; 4404 } else 4405 vhost->job_step(vhost); 4406 break; 4407 case IBMVFC_HOST_ACTION_QUERY: 4408 list_for_each_entry(tgt, &vhost->targets, queue) 4409 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target); 4410 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS); 4411 break; 4412 case IBMVFC_HOST_ACTION_QUERY_TGTS: 4413 list_for_each_entry(tgt, &vhost->targets, queue) { 4414 if (tgt->action == IBMVFC_TGT_ACTION_INIT) { 4415 tgt->job_step(tgt); 4416 break; 4417 } 4418 } 4419 4420 if (!ibmvfc_dev_init_to_do(vhost)) 4421 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); 4422 break; 4423 case IBMVFC_HOST_ACTION_TGT_DEL: 4424 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED: 4425 list_for_each_entry(tgt, &vhost->targets, queue) { 4426 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { 4427 tgt_dbg(tgt, "Deleting rport\n"); 4428 rport = tgt->rport; 4429 tgt->rport = NULL; 4430 list_del(&tgt->queue); 4431 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT); 4432 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4433 if (rport) 4434 fc_remote_port_delete(rport); 4435 del_timer_sync(&tgt->timer); 4436 kref_put(&tgt->kref, ibmvfc_release_tgt); 4437 return; 4438 } 4439 } 4440 4441 if (vhost->state == IBMVFC_INITIALIZING) { 4442 if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) { 4443 if (vhost->reinit) { 4444 vhost->reinit = 0; 4445 scsi_block_requests(vhost->host); 4446 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 4447 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4448 } else { 4449 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE); 4450 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 4451 wake_up(&vhost->init_wait_q); 4452 schedule_work(&vhost->rport_add_work_q); 4453 vhost->init_retries = 0; 4454 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4455 scsi_unblock_requests(vhost->host); 4456 } 4457 4458 return; 4459 } else { 4460 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 4461 vhost->job_step = ibmvfc_discover_targets; 4462 } 4463 } else { 4464 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 4465 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4466 scsi_unblock_requests(vhost->host); 4467 wake_up(&vhost->init_wait_q); 4468 return; 4469 } 4470 break; 4471 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 4472 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT); 4473 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4474 ibmvfc_alloc_targets(vhost); 4475 spin_lock_irqsave(vhost->host->host_lock, flags); 4476 break; 4477 case IBMVFC_HOST_ACTION_TGT_INIT: 4478 list_for_each_entry(tgt, &vhost->targets, queue) { 4479 if (tgt->action == IBMVFC_TGT_ACTION_INIT) { 4480 tgt->job_step(tgt); 4481 break; 4482 } 4483 } 4484 4485 if (!ibmvfc_dev_init_to_do(vhost)) 4486 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED); 4487 break; 4488 default: 4489 break; 4490 }; 4491 4492 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4493 } 4494 4495 /** 4496 * ibmvfc_work - Do task level work 4497 * @data: ibmvfc host struct 4498 * 4499 * Returns: 4500 * zero 4501 **/ 4502 static int ibmvfc_work(void *data) 4503 { 4504 struct ibmvfc_host *vhost = data; 4505 int rc; 4506 4507 set_user_nice(current, -20); 4508 4509 while (1) { 4510 rc = wait_event_interruptible(vhost->work_wait_q, 4511 ibmvfc_work_to_do(vhost)); 4512 4513 BUG_ON(rc); 4514 4515 if (kthread_should_stop()) 4516 break; 4517 4518 ibmvfc_do_work(vhost); 4519 } 4520 4521 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n"); 4522 return 0; 4523 } 4524 4525 /** 4526 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor 4527 * @vhost: ibmvfc host struct 4528 * 4529 * Allocates a page for messages, maps it for dma, and registers 4530 * the crq with the hypervisor. 4531 * 4532 * Return value: 4533 * zero on success / other on failure 4534 **/ 4535 static int ibmvfc_init_crq(struct ibmvfc_host *vhost) 4536 { 4537 int rc, retrc = -ENOMEM; 4538 struct device *dev = vhost->dev; 4539 struct vio_dev *vdev = to_vio_dev(dev); 4540 struct ibmvfc_crq_queue *crq = &vhost->crq; 4541 4542 ENTER; 4543 crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL); 4544 4545 if (!crq->msgs) 4546 return -ENOMEM; 4547 4548 crq->size = PAGE_SIZE / sizeof(*crq->msgs); 4549 crq->msg_token = dma_map_single(dev, crq->msgs, 4550 PAGE_SIZE, DMA_BIDIRECTIONAL); 4551 4552 if (dma_mapping_error(dev, crq->msg_token)) 4553 goto map_failed; 4554 4555 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 4556 crq->msg_token, PAGE_SIZE); 4557 4558 if (rc == H_RESOURCE) 4559 /* maybe kexecing and resource is busy. try a reset */ 4560 retrc = rc = ibmvfc_reset_crq(vhost); 4561 4562 if (rc == H_CLOSED) 4563 dev_warn(dev, "Partner adapter not ready\n"); 4564 else if (rc) { 4565 dev_warn(dev, "Error %d opening adapter\n", rc); 4566 goto reg_crq_failed; 4567 } 4568 4569 retrc = 0; 4570 4571 tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost); 4572 4573 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) { 4574 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc); 4575 goto req_irq_failed; 4576 } 4577 4578 if ((rc = vio_enable_interrupts(vdev))) { 4579 dev_err(dev, "Error %d enabling interrupts\n", rc); 4580 goto req_irq_failed; 4581 } 4582 4583 crq->cur = 0; 4584 LEAVE; 4585 return retrc; 4586 4587 req_irq_failed: 4588 tasklet_kill(&vhost->tasklet); 4589 do { 4590 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 4591 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 4592 reg_crq_failed: 4593 dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); 4594 map_failed: 4595 free_page((unsigned long)crq->msgs); 4596 return retrc; 4597 } 4598 4599 /** 4600 * ibmvfc_free_mem - Free memory for vhost 4601 * @vhost: ibmvfc host struct 4602 * 4603 * Return value: 4604 * none 4605 **/ 4606 static void ibmvfc_free_mem(struct ibmvfc_host *vhost) 4607 { 4608 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq; 4609 4610 ENTER; 4611 mempool_destroy(vhost->tgt_pool); 4612 kfree(vhost->trace); 4613 dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf, 4614 vhost->disc_buf_dma); 4615 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf), 4616 vhost->login_buf, vhost->login_buf_dma); 4617 dma_pool_destroy(vhost->sg_pool); 4618 dma_unmap_single(vhost->dev, async_q->msg_token, 4619 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL); 4620 free_page((unsigned long)async_q->msgs); 4621 LEAVE; 4622 } 4623 4624 /** 4625 * ibmvfc_alloc_mem - Allocate memory for vhost 4626 * @vhost: ibmvfc host struct 4627 * 4628 * Return value: 4629 * 0 on success / non-zero on failure 4630 **/ 4631 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost) 4632 { 4633 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq; 4634 struct device *dev = vhost->dev; 4635 4636 ENTER; 4637 async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL); 4638 if (!async_q->msgs) { 4639 dev_err(dev, "Couldn't allocate async queue.\n"); 4640 goto nomem; 4641 } 4642 4643 async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq); 4644 async_q->msg_token = dma_map_single(dev, async_q->msgs, 4645 async_q->size * sizeof(*async_q->msgs), 4646 DMA_BIDIRECTIONAL); 4647 4648 if (dma_mapping_error(dev, async_q->msg_token)) { 4649 dev_err(dev, "Failed to map async queue\n"); 4650 goto free_async_crq; 4651 } 4652 4653 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev, 4654 SG_ALL * sizeof(struct srp_direct_buf), 4655 sizeof(struct srp_direct_buf), 0); 4656 4657 if (!vhost->sg_pool) { 4658 dev_err(dev, "Failed to allocate sg pool\n"); 4659 goto unmap_async_crq; 4660 } 4661 4662 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf), 4663 &vhost->login_buf_dma, GFP_KERNEL); 4664 4665 if (!vhost->login_buf) { 4666 dev_err(dev, "Couldn't allocate NPIV login buffer\n"); 4667 goto free_sg_pool; 4668 } 4669 4670 vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets; 4671 vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz, 4672 &vhost->disc_buf_dma, GFP_KERNEL); 4673 4674 if (!vhost->disc_buf) { 4675 dev_err(dev, "Couldn't allocate Discover Targets buffer\n"); 4676 goto free_login_buffer; 4677 } 4678 4679 vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES, 4680 sizeof(struct ibmvfc_trace_entry), GFP_KERNEL); 4681 4682 if (!vhost->trace) 4683 goto free_disc_buffer; 4684 4685 vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ, 4686 sizeof(struct ibmvfc_target)); 4687 4688 if (!vhost->tgt_pool) { 4689 dev_err(dev, "Couldn't allocate target memory pool\n"); 4690 goto free_trace; 4691 } 4692 4693 LEAVE; 4694 return 0; 4695 4696 free_trace: 4697 kfree(vhost->trace); 4698 free_disc_buffer: 4699 dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf, 4700 vhost->disc_buf_dma); 4701 free_login_buffer: 4702 dma_free_coherent(dev, sizeof(*vhost->login_buf), 4703 vhost->login_buf, vhost->login_buf_dma); 4704 free_sg_pool: 4705 dma_pool_destroy(vhost->sg_pool); 4706 unmap_async_crq: 4707 dma_unmap_single(dev, async_q->msg_token, 4708 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL); 4709 free_async_crq: 4710 free_page((unsigned long)async_q->msgs); 4711 nomem: 4712 LEAVE; 4713 return -ENOMEM; 4714 } 4715 4716 /** 4717 * ibmvfc_rport_add_thread - Worker thread for rport adds 4718 * @work: work struct 4719 * 4720 **/ 4721 static void ibmvfc_rport_add_thread(struct work_struct *work) 4722 { 4723 struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host, 4724 rport_add_work_q); 4725 struct ibmvfc_target *tgt; 4726 struct fc_rport *rport; 4727 unsigned long flags; 4728 int did_work; 4729 4730 ENTER; 4731 spin_lock_irqsave(vhost->host->host_lock, flags); 4732 do { 4733 did_work = 0; 4734 if (vhost->state != IBMVFC_ACTIVE) 4735 break; 4736 4737 list_for_each_entry(tgt, &vhost->targets, queue) { 4738 if (tgt->add_rport) { 4739 did_work = 1; 4740 tgt->add_rport = 0; 4741 kref_get(&tgt->kref); 4742 rport = tgt->rport; 4743 if (!rport) { 4744 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4745 ibmvfc_tgt_add_rport(tgt); 4746 } else if (get_device(&rport->dev)) { 4747 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4748 tgt_dbg(tgt, "Setting rport roles\n"); 4749 fc_remote_port_rolechg(rport, tgt->ids.roles); 4750 put_device(&rport->dev); 4751 } 4752 4753 kref_put(&tgt->kref, ibmvfc_release_tgt); 4754 spin_lock_irqsave(vhost->host->host_lock, flags); 4755 break; 4756 } 4757 } 4758 } while(did_work); 4759 4760 if (vhost->state == IBMVFC_ACTIVE) 4761 vhost->scan_complete = 1; 4762 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4763 LEAVE; 4764 } 4765 4766 /** 4767 * ibmvfc_probe - Adapter hot plug add entry point 4768 * @vdev: vio device struct 4769 * @id: vio device id struct 4770 * 4771 * Return value: 4772 * 0 on success / non-zero on failure 4773 **/ 4774 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id) 4775 { 4776 struct ibmvfc_host *vhost; 4777 struct Scsi_Host *shost; 4778 struct device *dev = &vdev->dev; 4779 int rc = -ENOMEM; 4780 4781 ENTER; 4782 shost = scsi_host_alloc(&driver_template, sizeof(*vhost)); 4783 if (!shost) { 4784 dev_err(dev, "Couldn't allocate host data\n"); 4785 goto out; 4786 } 4787 4788 shost->transportt = ibmvfc_transport_template; 4789 shost->can_queue = max_requests; 4790 shost->max_lun = max_lun; 4791 shost->max_id = max_targets; 4792 shost->max_sectors = IBMVFC_MAX_SECTORS; 4793 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN; 4794 shost->unique_id = shost->host_no; 4795 4796 vhost = shost_priv(shost); 4797 INIT_LIST_HEAD(&vhost->sent); 4798 INIT_LIST_HEAD(&vhost->free); 4799 INIT_LIST_HEAD(&vhost->targets); 4800 sprintf(vhost->name, IBMVFC_NAME); 4801 vhost->host = shost; 4802 vhost->dev = dev; 4803 vhost->partition_number = -1; 4804 vhost->log_level = log_level; 4805 vhost->task_set = 1; 4806 strcpy(vhost->partition_name, "UNKNOWN"); 4807 init_waitqueue_head(&vhost->work_wait_q); 4808 init_waitqueue_head(&vhost->init_wait_q); 4809 INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread); 4810 mutex_init(&vhost->passthru_mutex); 4811 4812 if ((rc = ibmvfc_alloc_mem(vhost))) 4813 goto free_scsi_host; 4814 4815 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME, 4816 shost->host_no); 4817 4818 if (IS_ERR(vhost->work_thread)) { 4819 dev_err(dev, "Couldn't create kernel thread: %ld\n", 4820 PTR_ERR(vhost->work_thread)); 4821 goto free_host_mem; 4822 } 4823 4824 if ((rc = ibmvfc_init_crq(vhost))) { 4825 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc); 4826 goto kill_kthread; 4827 } 4828 4829 if ((rc = ibmvfc_init_event_pool(vhost))) { 4830 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc); 4831 goto release_crq; 4832 } 4833 4834 if ((rc = scsi_add_host(shost, dev))) 4835 goto release_event_pool; 4836 4837 fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO; 4838 4839 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj, 4840 &ibmvfc_trace_attr))) { 4841 dev_err(dev, "Failed to create trace file. rc=%d\n", rc); 4842 goto remove_shost; 4843 } 4844 4845 if (shost_to_fc_host(shost)->rqst_q) 4846 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1); 4847 dev_set_drvdata(dev, vhost); 4848 spin_lock(&ibmvfc_driver_lock); 4849 list_add_tail(&vhost->queue, &ibmvfc_head); 4850 spin_unlock(&ibmvfc_driver_lock); 4851 4852 ibmvfc_send_crq_init(vhost); 4853 scsi_scan_host(shost); 4854 return 0; 4855 4856 remove_shost: 4857 scsi_remove_host(shost); 4858 release_event_pool: 4859 ibmvfc_free_event_pool(vhost); 4860 release_crq: 4861 ibmvfc_release_crq_queue(vhost); 4862 kill_kthread: 4863 kthread_stop(vhost->work_thread); 4864 free_host_mem: 4865 ibmvfc_free_mem(vhost); 4866 free_scsi_host: 4867 scsi_host_put(shost); 4868 out: 4869 LEAVE; 4870 return rc; 4871 } 4872 4873 /** 4874 * ibmvfc_remove - Adapter hot plug remove entry point 4875 * @vdev: vio device struct 4876 * 4877 * Return value: 4878 * 0 4879 **/ 4880 static int ibmvfc_remove(struct vio_dev *vdev) 4881 { 4882 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev); 4883 unsigned long flags; 4884 4885 ENTER; 4886 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr); 4887 4888 spin_lock_irqsave(vhost->host->host_lock, flags); 4889 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 4890 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4891 4892 ibmvfc_wait_while_resetting(vhost); 4893 ibmvfc_release_crq_queue(vhost); 4894 kthread_stop(vhost->work_thread); 4895 fc_remove_host(vhost->host); 4896 scsi_remove_host(vhost->host); 4897 4898 spin_lock_irqsave(vhost->host->host_lock, flags); 4899 ibmvfc_purge_requests(vhost, DID_ERROR); 4900 ibmvfc_free_event_pool(vhost); 4901 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4902 4903 ibmvfc_free_mem(vhost); 4904 spin_lock(&ibmvfc_driver_lock); 4905 list_del(&vhost->queue); 4906 spin_unlock(&ibmvfc_driver_lock); 4907 scsi_host_put(vhost->host); 4908 LEAVE; 4909 return 0; 4910 } 4911 4912 /** 4913 * ibmvfc_resume - Resume from suspend 4914 * @dev: device struct 4915 * 4916 * We may have lost an interrupt across suspend/resume, so kick the 4917 * interrupt handler 4918 * 4919 */ 4920 static int ibmvfc_resume(struct device *dev) 4921 { 4922 unsigned long flags; 4923 struct ibmvfc_host *vhost = dev_get_drvdata(dev); 4924 struct vio_dev *vdev = to_vio_dev(dev); 4925 4926 spin_lock_irqsave(vhost->host->host_lock, flags); 4927 vio_disable_interrupts(vdev); 4928 tasklet_schedule(&vhost->tasklet); 4929 spin_unlock_irqrestore(vhost->host->host_lock, flags); 4930 return 0; 4931 } 4932 4933 /** 4934 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver 4935 * @vdev: vio device struct 4936 * 4937 * Return value: 4938 * Number of bytes the driver will need to DMA map at the same time in 4939 * order to perform well. 4940 */ 4941 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev) 4942 { 4943 unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu); 4944 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun); 4945 } 4946 4947 static struct vio_device_id ibmvfc_device_table[] = { 4948 {"fcp", "IBM,vfc-client"}, 4949 { "", "" } 4950 }; 4951 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table); 4952 4953 static struct dev_pm_ops ibmvfc_pm_ops = { 4954 .resume = ibmvfc_resume 4955 }; 4956 4957 static struct vio_driver ibmvfc_driver = { 4958 .id_table = ibmvfc_device_table, 4959 .probe = ibmvfc_probe, 4960 .remove = ibmvfc_remove, 4961 .get_desired_dma = ibmvfc_get_desired_dma, 4962 .name = IBMVFC_NAME, 4963 .pm = &ibmvfc_pm_ops, 4964 }; 4965 4966 static struct fc_function_template ibmvfc_transport_functions = { 4967 .show_host_fabric_name = 1, 4968 .show_host_node_name = 1, 4969 .show_host_port_name = 1, 4970 .show_host_supported_classes = 1, 4971 .show_host_port_type = 1, 4972 .show_host_port_id = 1, 4973 .show_host_maxframe_size = 1, 4974 4975 .get_host_port_state = ibmvfc_get_host_port_state, 4976 .show_host_port_state = 1, 4977 4978 .get_host_speed = ibmvfc_get_host_speed, 4979 .show_host_speed = 1, 4980 4981 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip, 4982 .terminate_rport_io = ibmvfc_terminate_rport_io, 4983 4984 .show_rport_maxframe_size = 1, 4985 .show_rport_supported_classes = 1, 4986 4987 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo, 4988 .show_rport_dev_loss_tmo = 1, 4989 4990 .get_starget_node_name = ibmvfc_get_starget_node_name, 4991 .show_starget_node_name = 1, 4992 4993 .get_starget_port_name = ibmvfc_get_starget_port_name, 4994 .show_starget_port_name = 1, 4995 4996 .get_starget_port_id = ibmvfc_get_starget_port_id, 4997 .show_starget_port_id = 1, 4998 4999 .bsg_request = ibmvfc_bsg_request, 5000 .bsg_timeout = ibmvfc_bsg_timeout, 5001 }; 5002 5003 /** 5004 * ibmvfc_module_init - Initialize the ibmvfc module 5005 * 5006 * Return value: 5007 * 0 on success / other on failure 5008 **/ 5009 static int __init ibmvfc_module_init(void) 5010 { 5011 int rc; 5012 5013 if (!firmware_has_feature(FW_FEATURE_VIO)) 5014 return -ENODEV; 5015 5016 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n", 5017 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE); 5018 5019 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions); 5020 if (!ibmvfc_transport_template) 5021 return -ENOMEM; 5022 5023 rc = vio_register_driver(&ibmvfc_driver); 5024 if (rc) 5025 fc_release_transport(ibmvfc_transport_template); 5026 return rc; 5027 } 5028 5029 /** 5030 * ibmvfc_module_exit - Teardown the ibmvfc module 5031 * 5032 * Return value: 5033 * nothing 5034 **/ 5035 static void __exit ibmvfc_module_exit(void) 5036 { 5037 vio_unregister_driver(&ibmvfc_driver); 5038 fc_release_transport(ibmvfc_transport_template); 5039 } 5040 5041 module_init(ibmvfc_module_init); 5042 module_exit(ibmvfc_module_exit); 5043