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