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