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 2035 scsi_target_unblock(&rport->dev); 2036 LEAVE; 2037 } 2038 2039 static const struct { 2040 enum ibmvfc_async_event ae; 2041 const char *desc; 2042 } ae_desc [] = { 2043 { IBMVFC_AE_ELS_PLOGI, "PLOGI" }, 2044 { IBMVFC_AE_ELS_LOGO, "LOGO" }, 2045 { IBMVFC_AE_ELS_PRLO, "PRLO" }, 2046 { IBMVFC_AE_SCN_NPORT, "N-Port SCN" }, 2047 { IBMVFC_AE_SCN_GROUP, "Group SCN" }, 2048 { IBMVFC_AE_SCN_DOMAIN, "Domain SCN" }, 2049 { IBMVFC_AE_SCN_FABRIC, "Fabric SCN" }, 2050 { IBMVFC_AE_LINK_UP, "Link Up" }, 2051 { IBMVFC_AE_LINK_DOWN, "Link Down" }, 2052 { IBMVFC_AE_LINK_DEAD, "Link Dead" }, 2053 { IBMVFC_AE_HALT, "Halt" }, 2054 { IBMVFC_AE_RESUME, "Resume" }, 2055 { IBMVFC_AE_ADAPTER_FAILED, "Adapter Failed" }, 2056 }; 2057 2058 static const char *unknown_ae = "Unknown async"; 2059 2060 /** 2061 * ibmvfc_get_ae_desc - Get text description for async event 2062 * @ae: async event 2063 * 2064 **/ 2065 static const char *ibmvfc_get_ae_desc(u64 ae) 2066 { 2067 int i; 2068 2069 for (i = 0; i < ARRAY_SIZE(ae_desc); i++) 2070 if (ae_desc[i].ae == ae) 2071 return ae_desc[i].desc; 2072 2073 return unknown_ae; 2074 } 2075 2076 /** 2077 * ibmvfc_handle_async - Handle an async event from the adapter 2078 * @crq: crq to process 2079 * @vhost: ibmvfc host struct 2080 * 2081 **/ 2082 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq, 2083 struct ibmvfc_host *vhost) 2084 { 2085 const char *desc = ibmvfc_get_ae_desc(crq->event); 2086 2087 ibmvfc_log(vhost, 3, "%s event received. scsi_id: %lx, wwpn: %lx," 2088 " node_name: %lx\n", desc, crq->scsi_id, crq->wwpn, crq->node_name); 2089 2090 switch (crq->event) { 2091 case IBMVFC_AE_LINK_UP: 2092 case IBMVFC_AE_RESUME: 2093 vhost->events_to_log |= IBMVFC_AE_LINKUP; 2094 ibmvfc_init_host(vhost, 1); 2095 break; 2096 case IBMVFC_AE_SCN_FABRIC: 2097 vhost->events_to_log |= IBMVFC_AE_RSCN; 2098 ibmvfc_init_host(vhost, 1); 2099 break; 2100 case IBMVFC_AE_SCN_NPORT: 2101 case IBMVFC_AE_SCN_GROUP: 2102 case IBMVFC_AE_SCN_DOMAIN: 2103 vhost->events_to_log |= IBMVFC_AE_RSCN; 2104 case IBMVFC_AE_ELS_LOGO: 2105 case IBMVFC_AE_ELS_PRLO: 2106 case IBMVFC_AE_ELS_PLOGI: 2107 ibmvfc_reinit_host(vhost); 2108 break; 2109 case IBMVFC_AE_LINK_DOWN: 2110 case IBMVFC_AE_ADAPTER_FAILED: 2111 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 2112 break; 2113 case IBMVFC_AE_LINK_DEAD: 2114 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 2115 break; 2116 case IBMVFC_AE_HALT: 2117 ibmvfc_link_down(vhost, IBMVFC_HALTED); 2118 break; 2119 default: 2120 dev_err(vhost->dev, "Unknown async event received: %ld\n", crq->event); 2121 break; 2122 }; 2123 } 2124 2125 /** 2126 * ibmvfc_handle_crq - Handles and frees received events in the CRQ 2127 * @crq: Command/Response queue 2128 * @vhost: ibmvfc host struct 2129 * 2130 **/ 2131 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost) 2132 { 2133 long rc; 2134 struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba; 2135 2136 switch (crq->valid) { 2137 case IBMVFC_CRQ_INIT_RSP: 2138 switch (crq->format) { 2139 case IBMVFC_CRQ_INIT: 2140 dev_info(vhost->dev, "Partner initialized\n"); 2141 /* Send back a response */ 2142 rc = ibmvfc_send_crq_init_complete(vhost); 2143 if (rc == 0) 2144 ibmvfc_init_host(vhost, 0); 2145 else 2146 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc); 2147 break; 2148 case IBMVFC_CRQ_INIT_COMPLETE: 2149 dev_info(vhost->dev, "Partner initialization complete\n"); 2150 ibmvfc_init_host(vhost, 0); 2151 break; 2152 default: 2153 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format); 2154 } 2155 return; 2156 case IBMVFC_CRQ_XPORT_EVENT: 2157 vhost->state = IBMVFC_NO_CRQ; 2158 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 2159 if (crq->format == IBMVFC_PARTITION_MIGRATED) { 2160 /* We need to re-setup the interpartition connection */ 2161 dev_info(vhost->dev, "Re-enabling adapter\n"); 2162 vhost->client_migrated = 1; 2163 ibmvfc_purge_requests(vhost, DID_REQUEUE); 2164 if ((rc = ibmvfc_reenable_crq_queue(vhost)) || 2165 (rc = ibmvfc_send_crq_init(vhost))) { 2166 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 2167 dev_err(vhost->dev, "Error after enable (rc=%ld)\n", rc); 2168 } else 2169 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 2170 } else { 2171 dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format); 2172 2173 ibmvfc_purge_requests(vhost, DID_ERROR); 2174 if ((rc = ibmvfc_reset_crq(vhost)) || 2175 (rc = ibmvfc_send_crq_init(vhost))) { 2176 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 2177 dev_err(vhost->dev, "Error after reset (rc=%ld)\n", rc); 2178 } else 2179 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN); 2180 } 2181 return; 2182 case IBMVFC_CRQ_CMD_RSP: 2183 break; 2184 default: 2185 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid); 2186 return; 2187 } 2188 2189 if (crq->format == IBMVFC_ASYNC_EVENT) 2190 return; 2191 2192 /* The only kind of payload CRQs we should get are responses to 2193 * things we send. Make sure this response is to something we 2194 * actually sent 2195 */ 2196 if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) { 2197 dev_err(vhost->dev, "Returned correlation_token 0x%08lx is invalid!\n", 2198 crq->ioba); 2199 return; 2200 } 2201 2202 if (unlikely(atomic_read(&evt->free))) { 2203 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08lx!\n", 2204 crq->ioba); 2205 return; 2206 } 2207 2208 del_timer(&evt->timer); 2209 list_del(&evt->queue); 2210 ibmvfc_trc_end(evt); 2211 evt->done(evt); 2212 } 2213 2214 /** 2215 * ibmvfc_scan_finished - Check if the device scan is done. 2216 * @shost: scsi host struct 2217 * @time: current elapsed time 2218 * 2219 * Returns: 2220 * 0 if scan is not done / 1 if scan is done 2221 **/ 2222 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time) 2223 { 2224 unsigned long flags; 2225 struct ibmvfc_host *vhost = shost_priv(shost); 2226 int done = 0; 2227 2228 spin_lock_irqsave(shost->host_lock, flags); 2229 if (time >= (init_timeout * HZ)) { 2230 dev_info(vhost->dev, "Scan taking longer than %d seconds, " 2231 "continuing initialization\n", init_timeout); 2232 done = 1; 2233 } 2234 2235 if (vhost->state != IBMVFC_NO_CRQ && vhost->action == IBMVFC_HOST_ACTION_NONE) 2236 done = 1; 2237 spin_unlock_irqrestore(shost->host_lock, flags); 2238 return done; 2239 } 2240 2241 /** 2242 * ibmvfc_slave_alloc - Setup the device's task set value 2243 * @sdev: struct scsi_device device to configure 2244 * 2245 * Set the device's task set value so that error handling works as 2246 * expected. 2247 * 2248 * Returns: 2249 * 0 on success / -ENXIO if device does not exist 2250 **/ 2251 static int ibmvfc_slave_alloc(struct scsi_device *sdev) 2252 { 2253 struct Scsi_Host *shost = sdev->host; 2254 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 2255 struct ibmvfc_host *vhost = shost_priv(shost); 2256 unsigned long flags = 0; 2257 2258 if (!rport || fc_remote_port_chkready(rport)) 2259 return -ENXIO; 2260 2261 spin_lock_irqsave(shost->host_lock, flags); 2262 sdev->hostdata = (void *)(unsigned long)vhost->task_set++; 2263 spin_unlock_irqrestore(shost->host_lock, flags); 2264 return 0; 2265 } 2266 2267 /** 2268 * ibmvfc_slave_configure - Configure the device 2269 * @sdev: struct scsi_device device to configure 2270 * 2271 * Enable allow_restart for a device if it is a disk. Adjust the 2272 * queue_depth here also. 2273 * 2274 * Returns: 2275 * 0 2276 **/ 2277 static int ibmvfc_slave_configure(struct scsi_device *sdev) 2278 { 2279 struct Scsi_Host *shost = sdev->host; 2280 struct fc_rport *rport = starget_to_rport(sdev->sdev_target); 2281 unsigned long flags = 0; 2282 2283 spin_lock_irqsave(shost->host_lock, flags); 2284 if (sdev->type == TYPE_DISK) 2285 sdev->allow_restart = 1; 2286 2287 if (sdev->tagged_supported) { 2288 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG); 2289 scsi_activate_tcq(sdev, sdev->queue_depth); 2290 } else 2291 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2292 2293 rport->dev_loss_tmo = dev_loss_tmo; 2294 spin_unlock_irqrestore(shost->host_lock, flags); 2295 return 0; 2296 } 2297 2298 /** 2299 * ibmvfc_change_queue_depth - Change the device's queue depth 2300 * @sdev: scsi device struct 2301 * @qdepth: depth to set 2302 * 2303 * Return value: 2304 * actual depth set 2305 **/ 2306 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth) 2307 { 2308 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN) 2309 qdepth = IBMVFC_MAX_CMDS_PER_LUN; 2310 2311 scsi_adjust_queue_depth(sdev, 0, qdepth); 2312 return sdev->queue_depth; 2313 } 2314 2315 /** 2316 * ibmvfc_change_queue_type - Change the device's queue type 2317 * @sdev: scsi device struct 2318 * @tag_type: type of tags to use 2319 * 2320 * Return value: 2321 * actual queue type set 2322 **/ 2323 static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type) 2324 { 2325 if (sdev->tagged_supported) { 2326 scsi_set_tag_type(sdev, tag_type); 2327 2328 if (tag_type) 2329 scsi_activate_tcq(sdev, sdev->queue_depth); 2330 else 2331 scsi_deactivate_tcq(sdev, sdev->queue_depth); 2332 } else 2333 tag_type = 0; 2334 2335 return tag_type; 2336 } 2337 2338 static ssize_t ibmvfc_show_host_partition_name(struct device *dev, 2339 struct device_attribute *attr, char *buf) 2340 { 2341 struct Scsi_Host *shost = class_to_shost(dev); 2342 struct ibmvfc_host *vhost = shost_priv(shost); 2343 2344 return snprintf(buf, PAGE_SIZE, "%s\n", 2345 vhost->login_buf->resp.partition_name); 2346 } 2347 2348 static struct device_attribute ibmvfc_host_partition_name = { 2349 .attr = { 2350 .name = "partition_name", 2351 .mode = S_IRUGO, 2352 }, 2353 .show = ibmvfc_show_host_partition_name, 2354 }; 2355 2356 static ssize_t ibmvfc_show_host_device_name(struct device *dev, 2357 struct device_attribute *attr, char *buf) 2358 { 2359 struct Scsi_Host *shost = class_to_shost(dev); 2360 struct ibmvfc_host *vhost = shost_priv(shost); 2361 2362 return snprintf(buf, PAGE_SIZE, "%s\n", 2363 vhost->login_buf->resp.device_name); 2364 } 2365 2366 static struct device_attribute ibmvfc_host_device_name = { 2367 .attr = { 2368 .name = "device_name", 2369 .mode = S_IRUGO, 2370 }, 2371 .show = ibmvfc_show_host_device_name, 2372 }; 2373 2374 static ssize_t ibmvfc_show_host_loc_code(struct device *dev, 2375 struct device_attribute *attr, char *buf) 2376 { 2377 struct Scsi_Host *shost = class_to_shost(dev); 2378 struct ibmvfc_host *vhost = shost_priv(shost); 2379 2380 return snprintf(buf, PAGE_SIZE, "%s\n", 2381 vhost->login_buf->resp.port_loc_code); 2382 } 2383 2384 static struct device_attribute ibmvfc_host_loc_code = { 2385 .attr = { 2386 .name = "port_loc_code", 2387 .mode = S_IRUGO, 2388 }, 2389 .show = ibmvfc_show_host_loc_code, 2390 }; 2391 2392 static ssize_t ibmvfc_show_host_drc_name(struct device *dev, 2393 struct device_attribute *attr, char *buf) 2394 { 2395 struct Scsi_Host *shost = class_to_shost(dev); 2396 struct ibmvfc_host *vhost = shost_priv(shost); 2397 2398 return snprintf(buf, PAGE_SIZE, "%s\n", 2399 vhost->login_buf->resp.drc_name); 2400 } 2401 2402 static struct device_attribute ibmvfc_host_drc_name = { 2403 .attr = { 2404 .name = "drc_name", 2405 .mode = S_IRUGO, 2406 }, 2407 .show = ibmvfc_show_host_drc_name, 2408 }; 2409 2410 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev, 2411 struct device_attribute *attr, char *buf) 2412 { 2413 struct Scsi_Host *shost = class_to_shost(dev); 2414 struct ibmvfc_host *vhost = shost_priv(shost); 2415 return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version); 2416 } 2417 2418 static struct device_attribute ibmvfc_host_npiv_version = { 2419 .attr = { 2420 .name = "npiv_version", 2421 .mode = S_IRUGO, 2422 }, 2423 .show = ibmvfc_show_host_npiv_version, 2424 }; 2425 2426 /** 2427 * ibmvfc_show_log_level - Show the adapter's error logging level 2428 * @dev: class device struct 2429 * @buf: buffer 2430 * 2431 * Return value: 2432 * number of bytes printed to buffer 2433 **/ 2434 static ssize_t ibmvfc_show_log_level(struct device *dev, 2435 struct device_attribute *attr, char *buf) 2436 { 2437 struct Scsi_Host *shost = class_to_shost(dev); 2438 struct ibmvfc_host *vhost = shost_priv(shost); 2439 unsigned long flags = 0; 2440 int len; 2441 2442 spin_lock_irqsave(shost->host_lock, flags); 2443 len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level); 2444 spin_unlock_irqrestore(shost->host_lock, flags); 2445 return len; 2446 } 2447 2448 /** 2449 * ibmvfc_store_log_level - Change the adapter's error logging level 2450 * @dev: class device struct 2451 * @buf: buffer 2452 * 2453 * Return value: 2454 * number of bytes printed to buffer 2455 **/ 2456 static ssize_t ibmvfc_store_log_level(struct device *dev, 2457 struct device_attribute *attr, 2458 const char *buf, size_t count) 2459 { 2460 struct Scsi_Host *shost = class_to_shost(dev); 2461 struct ibmvfc_host *vhost = shost_priv(shost); 2462 unsigned long flags = 0; 2463 2464 spin_lock_irqsave(shost->host_lock, flags); 2465 vhost->log_level = simple_strtoul(buf, NULL, 10); 2466 spin_unlock_irqrestore(shost->host_lock, flags); 2467 return strlen(buf); 2468 } 2469 2470 static struct device_attribute ibmvfc_log_level_attr = { 2471 .attr = { 2472 .name = "log_level", 2473 .mode = S_IRUGO | S_IWUSR, 2474 }, 2475 .show = ibmvfc_show_log_level, 2476 .store = ibmvfc_store_log_level 2477 }; 2478 2479 #ifdef CONFIG_SCSI_IBMVFC_TRACE 2480 /** 2481 * ibmvfc_read_trace - Dump the adapter trace 2482 * @kobj: kobject struct 2483 * @bin_attr: bin_attribute struct 2484 * @buf: buffer 2485 * @off: offset 2486 * @count: buffer size 2487 * 2488 * Return value: 2489 * number of bytes printed to buffer 2490 **/ 2491 static ssize_t ibmvfc_read_trace(struct kobject *kobj, 2492 struct bin_attribute *bin_attr, 2493 char *buf, loff_t off, size_t count) 2494 { 2495 struct device *dev = container_of(kobj, struct device, kobj); 2496 struct Scsi_Host *shost = class_to_shost(dev); 2497 struct ibmvfc_host *vhost = shost_priv(shost); 2498 unsigned long flags = 0; 2499 int size = IBMVFC_TRACE_SIZE; 2500 char *src = (char *)vhost->trace; 2501 2502 if (off > size) 2503 return 0; 2504 if (off + count > size) { 2505 size -= off; 2506 count = size; 2507 } 2508 2509 spin_lock_irqsave(shost->host_lock, flags); 2510 memcpy(buf, &src[off], count); 2511 spin_unlock_irqrestore(shost->host_lock, flags); 2512 return count; 2513 } 2514 2515 static struct bin_attribute ibmvfc_trace_attr = { 2516 .attr = { 2517 .name = "trace", 2518 .mode = S_IRUGO, 2519 }, 2520 .size = 0, 2521 .read = ibmvfc_read_trace, 2522 }; 2523 #endif 2524 2525 static struct device_attribute *ibmvfc_attrs[] = { 2526 &ibmvfc_host_partition_name, 2527 &ibmvfc_host_device_name, 2528 &ibmvfc_host_loc_code, 2529 &ibmvfc_host_drc_name, 2530 &ibmvfc_host_npiv_version, 2531 &ibmvfc_log_level_attr, 2532 NULL 2533 }; 2534 2535 static struct scsi_host_template driver_template = { 2536 .module = THIS_MODULE, 2537 .name = "IBM POWER Virtual FC Adapter", 2538 .proc_name = IBMVFC_NAME, 2539 .queuecommand = ibmvfc_queuecommand, 2540 .eh_abort_handler = ibmvfc_eh_abort_handler, 2541 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler, 2542 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler, 2543 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler, 2544 .slave_alloc = ibmvfc_slave_alloc, 2545 .slave_configure = ibmvfc_slave_configure, 2546 .scan_finished = ibmvfc_scan_finished, 2547 .change_queue_depth = ibmvfc_change_queue_depth, 2548 .change_queue_type = ibmvfc_change_queue_type, 2549 .cmd_per_lun = 16, 2550 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT, 2551 .this_id = -1, 2552 .sg_tablesize = SG_ALL, 2553 .max_sectors = IBMVFC_MAX_SECTORS, 2554 .use_clustering = ENABLE_CLUSTERING, 2555 .shost_attrs = ibmvfc_attrs, 2556 }; 2557 2558 /** 2559 * ibmvfc_next_async_crq - Returns the next entry in async queue 2560 * @vhost: ibmvfc host struct 2561 * 2562 * Returns: 2563 * Pointer to next entry in queue / NULL if empty 2564 **/ 2565 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost) 2566 { 2567 struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq; 2568 struct ibmvfc_async_crq *crq; 2569 2570 crq = &async_crq->msgs[async_crq->cur]; 2571 if (crq->valid & 0x80) { 2572 if (++async_crq->cur == async_crq->size) 2573 async_crq->cur = 0; 2574 } else 2575 crq = NULL; 2576 2577 return crq; 2578 } 2579 2580 /** 2581 * ibmvfc_next_crq - Returns the next entry in message queue 2582 * @vhost: ibmvfc host struct 2583 * 2584 * Returns: 2585 * Pointer to next entry in queue / NULL if empty 2586 **/ 2587 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost) 2588 { 2589 struct ibmvfc_crq_queue *queue = &vhost->crq; 2590 struct ibmvfc_crq *crq; 2591 2592 crq = &queue->msgs[queue->cur]; 2593 if (crq->valid & 0x80) { 2594 if (++queue->cur == queue->size) 2595 queue->cur = 0; 2596 } else 2597 crq = NULL; 2598 2599 return crq; 2600 } 2601 2602 /** 2603 * ibmvfc_interrupt - Interrupt handler 2604 * @irq: number of irq to handle, not used 2605 * @dev_instance: ibmvfc_host that received interrupt 2606 * 2607 * Returns: 2608 * IRQ_HANDLED 2609 **/ 2610 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance) 2611 { 2612 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance; 2613 struct vio_dev *vdev = to_vio_dev(vhost->dev); 2614 struct ibmvfc_crq *crq; 2615 struct ibmvfc_async_crq *async; 2616 unsigned long flags; 2617 int done = 0; 2618 2619 spin_lock_irqsave(vhost->host->host_lock, flags); 2620 vio_disable_interrupts(to_vio_dev(vhost->dev)); 2621 while (!done) { 2622 /* Pull all the valid messages off the CRQ */ 2623 while ((crq = ibmvfc_next_crq(vhost)) != NULL) { 2624 ibmvfc_handle_crq(crq, vhost); 2625 crq->valid = 0; 2626 } 2627 2628 /* Pull all the valid messages off the async CRQ */ 2629 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 2630 ibmvfc_handle_async(async, vhost); 2631 async->valid = 0; 2632 } 2633 2634 vio_enable_interrupts(vdev); 2635 if ((crq = ibmvfc_next_crq(vhost)) != NULL) { 2636 vio_disable_interrupts(vdev); 2637 ibmvfc_handle_crq(crq, vhost); 2638 crq->valid = 0; 2639 } else if ((async = ibmvfc_next_async_crq(vhost)) != NULL) { 2640 vio_disable_interrupts(vdev); 2641 ibmvfc_handle_async(async, vhost); 2642 crq->valid = 0; 2643 } else 2644 done = 1; 2645 } 2646 2647 spin_unlock_irqrestore(vhost->host->host_lock, flags); 2648 return IRQ_HANDLED; 2649 } 2650 2651 /** 2652 * ibmvfc_init_tgt - Set the next init job step for the target 2653 * @tgt: ibmvfc target struct 2654 * @job_step: job step to perform 2655 * 2656 **/ 2657 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt, 2658 void (*job_step) (struct ibmvfc_target *)) 2659 { 2660 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT); 2661 tgt->job_step = job_step; 2662 wake_up(&tgt->vhost->work_wait_q); 2663 } 2664 2665 /** 2666 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization 2667 * @tgt: ibmvfc target struct 2668 * @job_step: initialization job step 2669 * 2670 **/ 2671 static void ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt, 2672 void (*job_step) (struct ibmvfc_target *)) 2673 { 2674 if (++tgt->init_retries > IBMVFC_MAX_INIT_RETRIES) { 2675 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 2676 wake_up(&tgt->vhost->work_wait_q); 2677 } else 2678 ibmvfc_init_tgt(tgt, job_step); 2679 } 2680 2681 /** 2682 * ibmvfc_tgt_prli_done - Completion handler for Process Login 2683 * @evt: ibmvfc event struct 2684 * 2685 **/ 2686 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt) 2687 { 2688 struct ibmvfc_target *tgt = evt->tgt; 2689 struct ibmvfc_host *vhost = evt->vhost; 2690 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli; 2691 u32 status = rsp->common.status; 2692 2693 vhost->discovery_threads--; 2694 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 2695 switch (status) { 2696 case IBMVFC_MAD_SUCCESS: 2697 tgt_dbg(tgt, "Process Login succeeded\n"); 2698 tgt->need_login = 0; 2699 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_ADD_RPORT); 2700 break; 2701 case IBMVFC_MAD_DRIVER_FAILED: 2702 break; 2703 case IBMVFC_MAD_CRQ_ERROR: 2704 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 2705 break; 2706 case IBMVFC_MAD_FAILED: 2707 default: 2708 tgt_err(tgt, "Process Login failed: %s (%x:%x) rc=0x%02X\n", 2709 ibmvfc_get_cmd_error(rsp->status, rsp->error), 2710 rsp->status, rsp->error, status); 2711 if (ibmvfc_retry_cmd(rsp->status, rsp->error)) 2712 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli); 2713 break; 2714 }; 2715 2716 kref_put(&tgt->kref, ibmvfc_release_tgt); 2717 ibmvfc_free_event(evt); 2718 wake_up(&vhost->work_wait_q); 2719 } 2720 2721 /** 2722 * ibmvfc_tgt_send_prli - Send a process login 2723 * @tgt: ibmvfc target struct 2724 * 2725 **/ 2726 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt) 2727 { 2728 struct ibmvfc_process_login *prli; 2729 struct ibmvfc_host *vhost = tgt->vhost; 2730 struct ibmvfc_event *evt; 2731 2732 if (vhost->discovery_threads >= disc_threads) 2733 return; 2734 2735 kref_get(&tgt->kref); 2736 evt = ibmvfc_get_event(vhost); 2737 vhost->discovery_threads++; 2738 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT); 2739 evt->tgt = tgt; 2740 prli = &evt->iu.prli; 2741 memset(prli, 0, sizeof(*prli)); 2742 prli->common.version = 1; 2743 prli->common.opcode = IBMVFC_PROCESS_LOGIN; 2744 prli->common.length = sizeof(*prli); 2745 prli->scsi_id = tgt->scsi_id; 2746 2747 prli->parms.type = IBMVFC_SCSI_FCP_TYPE; 2748 prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR; 2749 prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC; 2750 2751 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 2752 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 2753 vhost->discovery_threads--; 2754 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 2755 kref_put(&tgt->kref, ibmvfc_release_tgt); 2756 } else 2757 tgt_dbg(tgt, "Sent process login\n"); 2758 } 2759 2760 /** 2761 * ibmvfc_tgt_plogi_done - Completion handler for Port Login 2762 * @evt: ibmvfc event struct 2763 * 2764 **/ 2765 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt) 2766 { 2767 struct ibmvfc_target *tgt = evt->tgt; 2768 struct ibmvfc_host *vhost = evt->vhost; 2769 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi; 2770 u32 status = rsp->common.status; 2771 2772 vhost->discovery_threads--; 2773 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 2774 switch (status) { 2775 case IBMVFC_MAD_SUCCESS: 2776 tgt_dbg(tgt, "Port Login succeeded\n"); 2777 if (tgt->ids.port_name && 2778 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) { 2779 vhost->reinit = 1; 2780 tgt_dbg(tgt, "Port re-init required\n"); 2781 break; 2782 } 2783 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name); 2784 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name); 2785 tgt->ids.port_id = tgt->scsi_id; 2786 tgt->ids.roles = FC_PORT_ROLE_FCP_TARGET; 2787 memcpy(&tgt->service_parms, &rsp->service_parms, 2788 sizeof(tgt->service_parms)); 2789 memcpy(&tgt->service_parms_change, &rsp->service_parms_change, 2790 sizeof(tgt->service_parms_change)); 2791 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli); 2792 break; 2793 case IBMVFC_MAD_DRIVER_FAILED: 2794 break; 2795 case IBMVFC_MAD_CRQ_ERROR: 2796 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 2797 break; 2798 case IBMVFC_MAD_FAILED: 2799 default: 2800 tgt_err(tgt, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 2801 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error, 2802 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type, 2803 ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status); 2804 2805 if (ibmvfc_retry_cmd(rsp->status, rsp->error)) 2806 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi); 2807 break; 2808 }; 2809 2810 kref_put(&tgt->kref, ibmvfc_release_tgt); 2811 ibmvfc_free_event(evt); 2812 wake_up(&vhost->work_wait_q); 2813 } 2814 2815 /** 2816 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target 2817 * @tgt: ibmvfc target struct 2818 * 2819 **/ 2820 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt) 2821 { 2822 struct ibmvfc_port_login *plogi; 2823 struct ibmvfc_host *vhost = tgt->vhost; 2824 struct ibmvfc_event *evt; 2825 2826 if (vhost->discovery_threads >= disc_threads) 2827 return; 2828 2829 kref_get(&tgt->kref); 2830 evt = ibmvfc_get_event(vhost); 2831 vhost->discovery_threads++; 2832 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 2833 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT); 2834 evt->tgt = tgt; 2835 plogi = &evt->iu.plogi; 2836 memset(plogi, 0, sizeof(*plogi)); 2837 plogi->common.version = 1; 2838 plogi->common.opcode = IBMVFC_PORT_LOGIN; 2839 plogi->common.length = sizeof(*plogi); 2840 plogi->scsi_id = tgt->scsi_id; 2841 2842 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 2843 vhost->discovery_threads--; 2844 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 2845 kref_put(&tgt->kref, ibmvfc_release_tgt); 2846 } else 2847 tgt_dbg(tgt, "Sent port login\n"); 2848 } 2849 2850 /** 2851 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD 2852 * @evt: ibmvfc event struct 2853 * 2854 **/ 2855 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt) 2856 { 2857 struct ibmvfc_target *tgt = evt->tgt; 2858 struct ibmvfc_host *vhost = evt->vhost; 2859 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout; 2860 u32 status = rsp->common.status; 2861 2862 vhost->discovery_threads--; 2863 ibmvfc_free_event(evt); 2864 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 2865 2866 switch (status) { 2867 case IBMVFC_MAD_SUCCESS: 2868 tgt_dbg(tgt, "Implicit Logout succeeded\n"); 2869 break; 2870 case IBMVFC_MAD_DRIVER_FAILED: 2871 kref_put(&tgt->kref, ibmvfc_release_tgt); 2872 wake_up(&vhost->work_wait_q); 2873 return; 2874 case IBMVFC_MAD_FAILED: 2875 default: 2876 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status); 2877 break; 2878 }; 2879 2880 if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT) 2881 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi); 2882 else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS && 2883 tgt->scsi_id != tgt->new_scsi_id) 2884 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 2885 kref_put(&tgt->kref, ibmvfc_release_tgt); 2886 wake_up(&vhost->work_wait_q); 2887 } 2888 2889 /** 2890 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target 2891 * @tgt: ibmvfc target struct 2892 * 2893 **/ 2894 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt) 2895 { 2896 struct ibmvfc_implicit_logout *mad; 2897 struct ibmvfc_host *vhost = tgt->vhost; 2898 struct ibmvfc_event *evt; 2899 2900 if (vhost->discovery_threads >= disc_threads) 2901 return; 2902 2903 kref_get(&tgt->kref); 2904 evt = ibmvfc_get_event(vhost); 2905 vhost->discovery_threads++; 2906 ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT); 2907 evt->tgt = tgt; 2908 mad = &evt->iu.implicit_logout; 2909 memset(mad, 0, sizeof(*mad)); 2910 mad->common.version = 1; 2911 mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT; 2912 mad->common.length = sizeof(*mad); 2913 mad->old_scsi_id = tgt->scsi_id; 2914 2915 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 2916 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 2917 vhost->discovery_threads--; 2918 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 2919 kref_put(&tgt->kref, ibmvfc_release_tgt); 2920 } else 2921 tgt_dbg(tgt, "Sent Implicit Logout\n"); 2922 } 2923 2924 /** 2925 * ibmvfc_adisc_needs_plogi - Does device need PLOGI? 2926 * @mad: ibmvfc passthru mad struct 2927 * @tgt: ibmvfc target struct 2928 * 2929 * Returns: 2930 * 1 if PLOGI needed / 0 if PLOGI not needed 2931 **/ 2932 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad, 2933 struct ibmvfc_target *tgt) 2934 { 2935 if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name, 2936 sizeof(tgt->ids.port_name))) 2937 return 1; 2938 if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name, 2939 sizeof(tgt->ids.node_name))) 2940 return 1; 2941 if (mad->fc_iu.response[6] != tgt->scsi_id) 2942 return 1; 2943 return 0; 2944 } 2945 2946 /** 2947 * ibmvfc_tgt_adisc_done - Completion handler for ADISC 2948 * @evt: ibmvfc event struct 2949 * 2950 **/ 2951 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt) 2952 { 2953 struct ibmvfc_target *tgt = evt->tgt; 2954 struct ibmvfc_host *vhost = evt->vhost; 2955 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru; 2956 u32 status = mad->common.status; 2957 u8 fc_reason, fc_explain; 2958 2959 vhost->discovery_threads--; 2960 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 2961 2962 switch (status) { 2963 case IBMVFC_MAD_SUCCESS: 2964 tgt_dbg(tgt, "ADISC succeeded\n"); 2965 if (ibmvfc_adisc_needs_plogi(mad, tgt)) 2966 tgt->need_login = 1; 2967 break; 2968 case IBMVFC_MAD_DRIVER_FAILED: 2969 break; 2970 case IBMVFC_MAD_FAILED: 2971 default: 2972 tgt->need_login = 1; 2973 fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16; 2974 fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8; 2975 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 2976 ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error), 2977 mad->iu.status, mad->iu.error, 2978 ibmvfc_get_fc_type(fc_reason), fc_reason, 2979 ibmvfc_get_ls_explain(fc_explain), fc_explain, status); 2980 break; 2981 }; 2982 2983 kref_put(&tgt->kref, ibmvfc_release_tgt); 2984 ibmvfc_free_event(evt); 2985 wake_up(&vhost->work_wait_q); 2986 } 2987 2988 /** 2989 * ibmvfc_init_passthru - Initialize an event struct for FC passthru 2990 * @evt: ibmvfc event struct 2991 * 2992 **/ 2993 static void ibmvfc_init_passthru(struct ibmvfc_event *evt) 2994 { 2995 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru; 2996 2997 memset(mad, 0, sizeof(*mad)); 2998 mad->common.version = 1; 2999 mad->common.opcode = IBMVFC_PASSTHRU; 3000 mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu); 3001 mad->cmd_ioba.va = (u64)evt->crq.ioba + 3002 offsetof(struct ibmvfc_passthru_mad, iu); 3003 mad->cmd_ioba.len = sizeof(mad->iu); 3004 mad->iu.cmd_len = sizeof(mad->fc_iu.payload); 3005 mad->iu.rsp_len = sizeof(mad->fc_iu.response); 3006 mad->iu.cmd.va = (u64)evt->crq.ioba + 3007 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 3008 offsetof(struct ibmvfc_passthru_fc_iu, payload); 3009 mad->iu.cmd.len = sizeof(mad->fc_iu.payload); 3010 mad->iu.rsp.va = (u64)evt->crq.ioba + 3011 offsetof(struct ibmvfc_passthru_mad, fc_iu) + 3012 offsetof(struct ibmvfc_passthru_fc_iu, response); 3013 mad->iu.rsp.len = sizeof(mad->fc_iu.response); 3014 } 3015 3016 /** 3017 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target 3018 * @tgt: ibmvfc target struct 3019 * 3020 **/ 3021 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt) 3022 { 3023 struct ibmvfc_passthru_mad *mad; 3024 struct ibmvfc_host *vhost = tgt->vhost; 3025 struct ibmvfc_event *evt; 3026 3027 if (vhost->discovery_threads >= disc_threads) 3028 return; 3029 3030 kref_get(&tgt->kref); 3031 evt = ibmvfc_get_event(vhost); 3032 vhost->discovery_threads++; 3033 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT); 3034 evt->tgt = tgt; 3035 3036 ibmvfc_init_passthru(evt); 3037 mad = &evt->iu.passthru; 3038 mad->iu.flags = IBMVFC_FC_ELS; 3039 mad->iu.scsi_id = tgt->scsi_id; 3040 3041 mad->fc_iu.payload[0] = IBMVFC_ADISC; 3042 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name, 3043 sizeof(vhost->login_buf->resp.port_name)); 3044 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name, 3045 sizeof(vhost->login_buf->resp.node_name)); 3046 mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff; 3047 3048 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 3049 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 3050 vhost->discovery_threads--; 3051 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3052 kref_put(&tgt->kref, ibmvfc_release_tgt); 3053 } else 3054 tgt_dbg(tgt, "Sent ADISC\n"); 3055 } 3056 3057 /** 3058 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD 3059 * @evt: ibmvfc event struct 3060 * 3061 **/ 3062 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt) 3063 { 3064 struct ibmvfc_target *tgt = evt->tgt; 3065 struct ibmvfc_host *vhost = evt->vhost; 3066 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt; 3067 u32 status = rsp->common.status; 3068 3069 vhost->discovery_threads--; 3070 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3071 switch (status) { 3072 case IBMVFC_MAD_SUCCESS: 3073 tgt_dbg(tgt, "Query Target succeeded\n"); 3074 tgt->new_scsi_id = rsp->scsi_id; 3075 if (rsp->scsi_id != tgt->scsi_id) 3076 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 3077 else 3078 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc); 3079 break; 3080 case IBMVFC_MAD_DRIVER_FAILED: 3081 break; 3082 case IBMVFC_MAD_CRQ_ERROR: 3083 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 3084 break; 3085 case IBMVFC_MAD_FAILED: 3086 default: 3087 tgt_err(tgt, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n", 3088 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error, 3089 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type, 3090 ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status); 3091 3092 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED && 3093 rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ && 3094 rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG) 3095 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT); 3096 else if (ibmvfc_retry_cmd(rsp->status, rsp->error)) 3097 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target); 3098 break; 3099 }; 3100 3101 kref_put(&tgt->kref, ibmvfc_release_tgt); 3102 ibmvfc_free_event(evt); 3103 wake_up(&vhost->work_wait_q); 3104 } 3105 3106 /** 3107 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target 3108 * @tgt: ibmvfc target struct 3109 * 3110 **/ 3111 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt) 3112 { 3113 struct ibmvfc_query_tgt *query_tgt; 3114 struct ibmvfc_host *vhost = tgt->vhost; 3115 struct ibmvfc_event *evt; 3116 3117 if (vhost->discovery_threads >= disc_threads) 3118 return; 3119 3120 kref_get(&tgt->kref); 3121 evt = ibmvfc_get_event(vhost); 3122 vhost->discovery_threads++; 3123 evt->tgt = tgt; 3124 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT); 3125 query_tgt = &evt->iu.query_tgt; 3126 memset(query_tgt, 0, sizeof(*query_tgt)); 3127 query_tgt->common.version = 1; 3128 query_tgt->common.opcode = IBMVFC_QUERY_TARGET; 3129 query_tgt->common.length = sizeof(*query_tgt); 3130 query_tgt->wwpn = tgt->ids.port_name; 3131 3132 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); 3133 if (ibmvfc_send_event(evt, vhost, default_timeout)) { 3134 vhost->discovery_threads--; 3135 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3136 kref_put(&tgt->kref, ibmvfc_release_tgt); 3137 } else 3138 tgt_dbg(tgt, "Sent Query Target\n"); 3139 } 3140 3141 /** 3142 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target 3143 * @vhost: ibmvfc host struct 3144 * @scsi_id: SCSI ID to allocate target for 3145 * 3146 * Returns: 3147 * 0 on success / other on failure 3148 **/ 3149 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id) 3150 { 3151 struct ibmvfc_target *tgt; 3152 unsigned long flags; 3153 3154 spin_lock_irqsave(vhost->host->host_lock, flags); 3155 list_for_each_entry(tgt, &vhost->targets, queue) { 3156 if (tgt->scsi_id == scsi_id) { 3157 if (tgt->need_login) 3158 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 3159 goto unlock_out; 3160 } 3161 } 3162 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3163 3164 tgt = mempool_alloc(vhost->tgt_pool, GFP_KERNEL); 3165 if (!tgt) { 3166 dev_err(vhost->dev, "Target allocation failure for scsi id %08lx\n", 3167 scsi_id); 3168 return -ENOMEM; 3169 } 3170 3171 tgt->scsi_id = scsi_id; 3172 tgt->new_scsi_id = scsi_id; 3173 tgt->vhost = vhost; 3174 tgt->need_login = 1; 3175 kref_init(&tgt->kref); 3176 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout); 3177 spin_lock_irqsave(vhost->host->host_lock, flags); 3178 list_add_tail(&tgt->queue, &vhost->targets); 3179 3180 unlock_out: 3181 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3182 return 0; 3183 } 3184 3185 /** 3186 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets 3187 * @vhost: ibmvfc host struct 3188 * 3189 * Returns: 3190 * 0 on success / other on failure 3191 **/ 3192 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost) 3193 { 3194 int i, rc; 3195 3196 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++) 3197 rc = ibmvfc_alloc_target(vhost, 3198 vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK); 3199 3200 return rc; 3201 } 3202 3203 /** 3204 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD 3205 * @evt: ibmvfc event struct 3206 * 3207 **/ 3208 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt) 3209 { 3210 struct ibmvfc_host *vhost = evt->vhost; 3211 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets; 3212 u32 mad_status = rsp->common.status; 3213 3214 switch (mad_status) { 3215 case IBMVFC_MAD_SUCCESS: 3216 ibmvfc_dbg(vhost, "Discover Targets succeeded\n"); 3217 vhost->num_targets = rsp->num_written; 3218 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS); 3219 break; 3220 case IBMVFC_MAD_FAILED: 3221 dev_err(vhost->dev, "Discover Targets failed: %s (%x:%x)\n", 3222 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error); 3223 ibmvfc_retry_host_init(vhost); 3224 break; 3225 case IBMVFC_MAD_DRIVER_FAILED: 3226 break; 3227 default: 3228 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status); 3229 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3230 break; 3231 } 3232 3233 ibmvfc_free_event(evt); 3234 wake_up(&vhost->work_wait_q); 3235 } 3236 3237 /** 3238 * ibmvfc_discover_targets - Send Discover Targets MAD 3239 * @vhost: ibmvfc host struct 3240 * 3241 **/ 3242 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost) 3243 { 3244 struct ibmvfc_discover_targets *mad; 3245 struct ibmvfc_event *evt = ibmvfc_get_event(vhost); 3246 3247 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT); 3248 mad = &evt->iu.discover_targets; 3249 memset(mad, 0, sizeof(*mad)); 3250 mad->common.version = 1; 3251 mad->common.opcode = IBMVFC_DISC_TARGETS; 3252 mad->common.length = sizeof(*mad); 3253 mad->bufflen = vhost->disc_buf_sz; 3254 mad->buffer.va = vhost->disc_buf_dma; 3255 mad->buffer.len = vhost->disc_buf_sz; 3256 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 3257 3258 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 3259 ibmvfc_dbg(vhost, "Sent discover targets\n"); 3260 else 3261 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3262 } 3263 3264 /** 3265 * ibmvfc_npiv_login_done - Completion handler for NPIV Login 3266 * @evt: ibmvfc event struct 3267 * 3268 **/ 3269 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt) 3270 { 3271 struct ibmvfc_host *vhost = evt->vhost; 3272 u32 mad_status = evt->xfer_iu->npiv_login.common.status; 3273 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp; 3274 unsigned int npiv_max_sectors; 3275 3276 switch (mad_status) { 3277 case IBMVFC_MAD_SUCCESS: 3278 ibmvfc_free_event(evt); 3279 break; 3280 case IBMVFC_MAD_FAILED: 3281 dev_err(vhost->dev, "NPIV Login failed: %s (%x:%x)\n", 3282 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error); 3283 if (ibmvfc_retry_cmd(rsp->status, rsp->error)) 3284 ibmvfc_retry_host_init(vhost); 3285 else 3286 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3287 ibmvfc_free_event(evt); 3288 return; 3289 case IBMVFC_MAD_CRQ_ERROR: 3290 ibmvfc_retry_host_init(vhost); 3291 case IBMVFC_MAD_DRIVER_FAILED: 3292 ibmvfc_free_event(evt); 3293 return; 3294 default: 3295 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status); 3296 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3297 ibmvfc_free_event(evt); 3298 return; 3299 } 3300 3301 vhost->client_migrated = 0; 3302 3303 if (!(rsp->flags & IBMVFC_NATIVE_FC)) { 3304 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n", 3305 rsp->flags); 3306 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3307 wake_up(&vhost->work_wait_q); 3308 return; 3309 } 3310 3311 if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) { 3312 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n", 3313 rsp->max_cmds); 3314 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3315 wake_up(&vhost->work_wait_q); 3316 return; 3317 } 3318 3319 npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS); 3320 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n", 3321 rsp->partition_name, rsp->device_name, rsp->port_loc_code, 3322 rsp->drc_name, npiv_max_sectors); 3323 3324 fc_host_fabric_name(vhost->host) = rsp->node_name; 3325 fc_host_node_name(vhost->host) = rsp->node_name; 3326 fc_host_port_name(vhost->host) = rsp->port_name; 3327 fc_host_port_id(vhost->host) = rsp->scsi_id; 3328 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV; 3329 fc_host_supported_classes(vhost->host) = 0; 3330 if (rsp->service_parms.class1_parms[0] & 0x80000000) 3331 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1; 3332 if (rsp->service_parms.class2_parms[0] & 0x80000000) 3333 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2; 3334 if (rsp->service_parms.class3_parms[0] & 0x80000000) 3335 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3; 3336 fc_host_maxframe_size(vhost->host) = 3337 rsp->service_parms.common.bb_rcv_sz & 0x0fff; 3338 3339 vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ; 3340 vhost->host->max_sectors = npiv_max_sectors; 3341 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 3342 wake_up(&vhost->work_wait_q); 3343 } 3344 3345 /** 3346 * ibmvfc_npiv_login - Sends NPIV login 3347 * @vhost: ibmvfc host struct 3348 * 3349 **/ 3350 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost) 3351 { 3352 struct ibmvfc_npiv_login_mad *mad; 3353 struct ibmvfc_event *evt = ibmvfc_get_event(vhost); 3354 3355 ibmvfc_gather_partition_info(vhost); 3356 ibmvfc_set_login_info(vhost); 3357 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT); 3358 3359 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info)); 3360 mad = &evt->iu.npiv_login; 3361 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad)); 3362 mad->common.version = 1; 3363 mad->common.opcode = IBMVFC_NPIV_LOGIN; 3364 mad->common.length = sizeof(struct ibmvfc_npiv_login_mad); 3365 mad->buffer.va = vhost->login_buf_dma; 3366 mad->buffer.len = sizeof(*vhost->login_buf); 3367 3368 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT); 3369 3370 if (!ibmvfc_send_event(evt, vhost, default_timeout)) 3371 ibmvfc_dbg(vhost, "Sent NPIV login\n"); 3372 else 3373 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD); 3374 }; 3375 3376 /** 3377 * ibmvfc_dev_init_to_do - Is there target initialization work to do? 3378 * @vhost: ibmvfc host struct 3379 * 3380 * Returns: 3381 * 1 if work to do / 0 if not 3382 **/ 3383 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost) 3384 { 3385 struct ibmvfc_target *tgt; 3386 3387 list_for_each_entry(tgt, &vhost->targets, queue) { 3388 if (tgt->action == IBMVFC_TGT_ACTION_INIT || 3389 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 3390 return 1; 3391 } 3392 3393 return 0; 3394 } 3395 3396 /** 3397 * __ibmvfc_work_to_do - Is there task level work to do? (no locking) 3398 * @vhost: ibmvfc host struct 3399 * 3400 * Returns: 3401 * 1 if work to do / 0 if not 3402 **/ 3403 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost) 3404 { 3405 struct ibmvfc_target *tgt; 3406 3407 if (kthread_should_stop()) 3408 return 1; 3409 switch (vhost->action) { 3410 case IBMVFC_HOST_ACTION_NONE: 3411 case IBMVFC_HOST_ACTION_INIT_WAIT: 3412 return 0; 3413 case IBMVFC_HOST_ACTION_TGT_INIT: 3414 case IBMVFC_HOST_ACTION_QUERY_TGTS: 3415 if (vhost->discovery_threads == disc_threads) 3416 return 0; 3417 list_for_each_entry(tgt, &vhost->targets, queue) 3418 if (tgt->action == IBMVFC_TGT_ACTION_INIT) 3419 return 1; 3420 list_for_each_entry(tgt, &vhost->targets, queue) 3421 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT) 3422 return 0; 3423 return 1; 3424 case IBMVFC_HOST_ACTION_INIT: 3425 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 3426 case IBMVFC_HOST_ACTION_TGT_ADD: 3427 case IBMVFC_HOST_ACTION_TGT_DEL: 3428 case IBMVFC_HOST_ACTION_QUERY: 3429 default: 3430 break; 3431 }; 3432 3433 return 1; 3434 } 3435 3436 /** 3437 * ibmvfc_work_to_do - Is there task level work to do? 3438 * @vhost: ibmvfc host struct 3439 * 3440 * Returns: 3441 * 1 if work to do / 0 if not 3442 **/ 3443 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost) 3444 { 3445 unsigned long flags; 3446 int rc; 3447 3448 spin_lock_irqsave(vhost->host->host_lock, flags); 3449 rc = __ibmvfc_work_to_do(vhost); 3450 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3451 return rc; 3452 } 3453 3454 /** 3455 * ibmvfc_log_ae - Log async events if necessary 3456 * @vhost: ibmvfc host struct 3457 * @events: events to log 3458 * 3459 **/ 3460 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events) 3461 { 3462 if (events & IBMVFC_AE_RSCN) 3463 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0); 3464 if ((events & IBMVFC_AE_LINKDOWN) && 3465 vhost->state >= IBMVFC_HALTED) 3466 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0); 3467 if ((events & IBMVFC_AE_LINKUP) && 3468 vhost->state == IBMVFC_INITIALIZING) 3469 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0); 3470 } 3471 3472 /** 3473 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port 3474 * @tgt: ibmvfc target struct 3475 * 3476 **/ 3477 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt) 3478 { 3479 struct ibmvfc_host *vhost = tgt->vhost; 3480 struct fc_rport *rport; 3481 unsigned long flags; 3482 3483 tgt_dbg(tgt, "Adding rport\n"); 3484 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids); 3485 spin_lock_irqsave(vhost->host->host_lock, flags); 3486 tgt->rport = rport; 3487 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE); 3488 if (rport) { 3489 tgt_dbg(tgt, "rport add succeeded\n"); 3490 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff; 3491 rport->supported_classes = 0; 3492 tgt->target_id = rport->scsi_target_id; 3493 if (tgt->service_parms.class1_parms[0] & 0x80000000) 3494 rport->supported_classes |= FC_COS_CLASS1; 3495 if (tgt->service_parms.class2_parms[0] & 0x80000000) 3496 rport->supported_classes |= FC_COS_CLASS2; 3497 if (tgt->service_parms.class3_parms[0] & 0x80000000) 3498 rport->supported_classes |= FC_COS_CLASS3; 3499 } else 3500 tgt_dbg(tgt, "rport add failed\n"); 3501 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3502 } 3503 3504 /** 3505 * ibmvfc_do_work - Do task level work 3506 * @vhost: ibmvfc host struct 3507 * 3508 **/ 3509 static void ibmvfc_do_work(struct ibmvfc_host *vhost) 3510 { 3511 struct ibmvfc_target *tgt; 3512 unsigned long flags; 3513 struct fc_rport *rport; 3514 3515 ibmvfc_log_ae(vhost, vhost->events_to_log); 3516 spin_lock_irqsave(vhost->host->host_lock, flags); 3517 vhost->events_to_log = 0; 3518 switch (vhost->action) { 3519 case IBMVFC_HOST_ACTION_NONE: 3520 case IBMVFC_HOST_ACTION_INIT_WAIT: 3521 break; 3522 case IBMVFC_HOST_ACTION_INIT: 3523 BUG_ON(vhost->state != IBMVFC_INITIALIZING); 3524 vhost->job_step(vhost); 3525 break; 3526 case IBMVFC_HOST_ACTION_QUERY: 3527 list_for_each_entry(tgt, &vhost->targets, queue) 3528 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target); 3529 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS); 3530 break; 3531 case IBMVFC_HOST_ACTION_QUERY_TGTS: 3532 list_for_each_entry(tgt, &vhost->targets, queue) { 3533 if (tgt->action == IBMVFC_TGT_ACTION_INIT) { 3534 tgt->job_step(tgt); 3535 break; 3536 } 3537 } 3538 3539 if (!ibmvfc_dev_init_to_do(vhost)) 3540 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL); 3541 break; 3542 case IBMVFC_HOST_ACTION_TGT_DEL: 3543 list_for_each_entry(tgt, &vhost->targets, queue) { 3544 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { 3545 tgt_dbg(tgt, "Deleting rport\n"); 3546 rport = tgt->rport; 3547 tgt->rport = NULL; 3548 list_del(&tgt->queue); 3549 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3550 if (rport) 3551 fc_remote_port_delete(rport); 3552 kref_put(&tgt->kref, ibmvfc_release_tgt); 3553 return; 3554 } 3555 } 3556 3557 if (vhost->state == IBMVFC_INITIALIZING) { 3558 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT); 3559 vhost->job_step = ibmvfc_discover_targets; 3560 } else { 3561 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 3562 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3563 scsi_unblock_requests(vhost->host); 3564 wake_up(&vhost->init_wait_q); 3565 return; 3566 } 3567 break; 3568 case IBMVFC_HOST_ACTION_ALLOC_TGTS: 3569 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT); 3570 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3571 ibmvfc_alloc_targets(vhost); 3572 spin_lock_irqsave(vhost->host->host_lock, flags); 3573 break; 3574 case IBMVFC_HOST_ACTION_TGT_INIT: 3575 list_for_each_entry(tgt, &vhost->targets, queue) { 3576 if (tgt->action == IBMVFC_TGT_ACTION_INIT) { 3577 tgt->job_step(tgt); 3578 break; 3579 } 3580 } 3581 3582 if (!ibmvfc_dev_init_to_do(vhost)) { 3583 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE); 3584 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_ADD); 3585 vhost->init_retries = 0; 3586 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3587 scsi_unblock_requests(vhost->host); 3588 return; 3589 } 3590 break; 3591 case IBMVFC_HOST_ACTION_TGT_ADD: 3592 list_for_each_entry(tgt, &vhost->targets, queue) { 3593 if (tgt->action == IBMVFC_TGT_ACTION_ADD_RPORT) { 3594 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3595 ibmvfc_tgt_add_rport(tgt); 3596 return; 3597 } else if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) { 3598 tgt_dbg(tgt, "Deleting rport\n"); 3599 rport = tgt->rport; 3600 tgt->rport = NULL; 3601 list_del(&tgt->queue); 3602 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3603 if (rport) 3604 fc_remote_port_delete(rport); 3605 kref_put(&tgt->kref, ibmvfc_release_tgt); 3606 return; 3607 } 3608 } 3609 3610 if (vhost->reinit && !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) { 3611 vhost->reinit = 0; 3612 scsi_block_requests(vhost->host); 3613 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY); 3614 } else { 3615 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE); 3616 wake_up(&vhost->init_wait_q); 3617 } 3618 break; 3619 default: 3620 break; 3621 }; 3622 3623 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3624 } 3625 3626 /** 3627 * ibmvfc_work - Do task level work 3628 * @data: ibmvfc host struct 3629 * 3630 * Returns: 3631 * zero 3632 **/ 3633 static int ibmvfc_work(void *data) 3634 { 3635 struct ibmvfc_host *vhost = data; 3636 int rc; 3637 3638 set_user_nice(current, -20); 3639 3640 while (1) { 3641 rc = wait_event_interruptible(vhost->work_wait_q, 3642 ibmvfc_work_to_do(vhost)); 3643 3644 BUG_ON(rc); 3645 3646 if (kthread_should_stop()) 3647 break; 3648 3649 ibmvfc_do_work(vhost); 3650 } 3651 3652 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n"); 3653 return 0; 3654 } 3655 3656 /** 3657 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor 3658 * @vhost: ibmvfc host struct 3659 * 3660 * Allocates a page for messages, maps it for dma, and registers 3661 * the crq with the hypervisor. 3662 * 3663 * Return value: 3664 * zero on success / other on failure 3665 **/ 3666 static int ibmvfc_init_crq(struct ibmvfc_host *vhost) 3667 { 3668 int rc, retrc = -ENOMEM; 3669 struct device *dev = vhost->dev; 3670 struct vio_dev *vdev = to_vio_dev(dev); 3671 struct ibmvfc_crq_queue *crq = &vhost->crq; 3672 3673 ENTER; 3674 crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL); 3675 3676 if (!crq->msgs) 3677 return -ENOMEM; 3678 3679 crq->size = PAGE_SIZE / sizeof(*crq->msgs); 3680 crq->msg_token = dma_map_single(dev, crq->msgs, 3681 PAGE_SIZE, DMA_BIDIRECTIONAL); 3682 3683 if (dma_mapping_error(dev, crq->msg_token)) 3684 goto map_failed; 3685 3686 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 3687 crq->msg_token, PAGE_SIZE); 3688 3689 if (rc == H_RESOURCE) 3690 /* maybe kexecing and resource is busy. try a reset */ 3691 retrc = rc = ibmvfc_reset_crq(vhost); 3692 3693 if (rc == H_CLOSED) 3694 dev_warn(dev, "Partner adapter not ready\n"); 3695 else if (rc) { 3696 dev_warn(dev, "Error %d opening adapter\n", rc); 3697 goto reg_crq_failed; 3698 } 3699 3700 retrc = 0; 3701 3702 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) { 3703 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc); 3704 goto req_irq_failed; 3705 } 3706 3707 if ((rc = vio_enable_interrupts(vdev))) { 3708 dev_err(dev, "Error %d enabling interrupts\n", rc); 3709 goto req_irq_failed; 3710 } 3711 3712 crq->cur = 0; 3713 LEAVE; 3714 return retrc; 3715 3716 req_irq_failed: 3717 do { 3718 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 3719 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 3720 reg_crq_failed: 3721 dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); 3722 map_failed: 3723 free_page((unsigned long)crq->msgs); 3724 return retrc; 3725 } 3726 3727 /** 3728 * ibmvfc_free_mem - Free memory for vhost 3729 * @vhost: ibmvfc host struct 3730 * 3731 * Return value: 3732 * none 3733 **/ 3734 static void ibmvfc_free_mem(struct ibmvfc_host *vhost) 3735 { 3736 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq; 3737 3738 ENTER; 3739 mempool_destroy(vhost->tgt_pool); 3740 kfree(vhost->trace); 3741 dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf, 3742 vhost->disc_buf_dma); 3743 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf), 3744 vhost->login_buf, vhost->login_buf_dma); 3745 dma_pool_destroy(vhost->sg_pool); 3746 dma_unmap_single(vhost->dev, async_q->msg_token, 3747 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL); 3748 free_page((unsigned long)async_q->msgs); 3749 LEAVE; 3750 } 3751 3752 /** 3753 * ibmvfc_alloc_mem - Allocate memory for vhost 3754 * @vhost: ibmvfc host struct 3755 * 3756 * Return value: 3757 * 0 on success / non-zero on failure 3758 **/ 3759 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost) 3760 { 3761 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq; 3762 struct device *dev = vhost->dev; 3763 3764 ENTER; 3765 async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL); 3766 if (!async_q->msgs) { 3767 dev_err(dev, "Couldn't allocate async queue.\n"); 3768 goto nomem; 3769 } 3770 3771 async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq); 3772 async_q->msg_token = dma_map_single(dev, async_q->msgs, 3773 async_q->size * sizeof(*async_q->msgs), 3774 DMA_BIDIRECTIONAL); 3775 3776 if (dma_mapping_error(dev, async_q->msg_token)) { 3777 dev_err(dev, "Failed to map async queue\n"); 3778 goto free_async_crq; 3779 } 3780 3781 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev, 3782 SG_ALL * sizeof(struct srp_direct_buf), 3783 sizeof(struct srp_direct_buf), 0); 3784 3785 if (!vhost->sg_pool) { 3786 dev_err(dev, "Failed to allocate sg pool\n"); 3787 goto unmap_async_crq; 3788 } 3789 3790 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf), 3791 &vhost->login_buf_dma, GFP_KERNEL); 3792 3793 if (!vhost->login_buf) { 3794 dev_err(dev, "Couldn't allocate NPIV login buffer\n"); 3795 goto free_sg_pool; 3796 } 3797 3798 vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets; 3799 vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz, 3800 &vhost->disc_buf_dma, GFP_KERNEL); 3801 3802 if (!vhost->disc_buf) { 3803 dev_err(dev, "Couldn't allocate Discover Targets buffer\n"); 3804 goto free_login_buffer; 3805 } 3806 3807 vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES, 3808 sizeof(struct ibmvfc_trace_entry), GFP_KERNEL); 3809 3810 if (!vhost->trace) 3811 goto free_disc_buffer; 3812 3813 vhost->tgt_pool = mempool_create_kzalloc_pool(IBMVFC_TGT_MEMPOOL_SZ, 3814 sizeof(struct ibmvfc_target)); 3815 3816 if (!vhost->tgt_pool) { 3817 dev_err(dev, "Couldn't allocate target memory pool\n"); 3818 goto free_trace; 3819 } 3820 3821 LEAVE; 3822 return 0; 3823 3824 free_trace: 3825 kfree(vhost->trace); 3826 free_disc_buffer: 3827 dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf, 3828 vhost->disc_buf_dma); 3829 free_login_buffer: 3830 dma_free_coherent(dev, sizeof(*vhost->login_buf), 3831 vhost->login_buf, vhost->login_buf_dma); 3832 free_sg_pool: 3833 dma_pool_destroy(vhost->sg_pool); 3834 unmap_async_crq: 3835 dma_unmap_single(dev, async_q->msg_token, 3836 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL); 3837 free_async_crq: 3838 free_page((unsigned long)async_q->msgs); 3839 nomem: 3840 LEAVE; 3841 return -ENOMEM; 3842 } 3843 3844 /** 3845 * ibmvfc_probe - Adapter hot plug add entry point 3846 * @vdev: vio device struct 3847 * @id: vio device id struct 3848 * 3849 * Return value: 3850 * 0 on success / non-zero on failure 3851 **/ 3852 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id) 3853 { 3854 struct ibmvfc_host *vhost; 3855 struct Scsi_Host *shost; 3856 struct device *dev = &vdev->dev; 3857 int rc = -ENOMEM; 3858 3859 ENTER; 3860 shost = scsi_host_alloc(&driver_template, sizeof(*vhost)); 3861 if (!shost) { 3862 dev_err(dev, "Couldn't allocate host data\n"); 3863 goto out; 3864 } 3865 3866 shost->transportt = ibmvfc_transport_template; 3867 shost->can_queue = max_requests; 3868 shost->max_lun = max_lun; 3869 shost->max_id = max_targets; 3870 shost->max_sectors = IBMVFC_MAX_SECTORS; 3871 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN; 3872 shost->unique_id = shost->host_no; 3873 3874 vhost = shost_priv(shost); 3875 INIT_LIST_HEAD(&vhost->sent); 3876 INIT_LIST_HEAD(&vhost->free); 3877 INIT_LIST_HEAD(&vhost->targets); 3878 sprintf(vhost->name, IBMVFC_NAME); 3879 vhost->host = shost; 3880 vhost->dev = dev; 3881 vhost->partition_number = -1; 3882 vhost->log_level = log_level; 3883 strcpy(vhost->partition_name, "UNKNOWN"); 3884 init_waitqueue_head(&vhost->work_wait_q); 3885 init_waitqueue_head(&vhost->init_wait_q); 3886 3887 if ((rc = ibmvfc_alloc_mem(vhost))) 3888 goto free_scsi_host; 3889 3890 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME, 3891 shost->host_no); 3892 3893 if (IS_ERR(vhost->work_thread)) { 3894 dev_err(dev, "Couldn't create kernel thread: %ld\n", 3895 PTR_ERR(vhost->work_thread)); 3896 goto free_host_mem; 3897 } 3898 3899 if ((rc = ibmvfc_init_crq(vhost))) { 3900 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc); 3901 goto kill_kthread; 3902 } 3903 3904 if ((rc = ibmvfc_init_event_pool(vhost))) { 3905 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc); 3906 goto release_crq; 3907 } 3908 3909 if ((rc = scsi_add_host(shost, dev))) 3910 goto release_event_pool; 3911 3912 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj, 3913 &ibmvfc_trace_attr))) { 3914 dev_err(dev, "Failed to create trace file. rc=%d\n", rc); 3915 goto remove_shost; 3916 } 3917 3918 dev_set_drvdata(dev, vhost); 3919 spin_lock(&ibmvfc_driver_lock); 3920 list_add_tail(&vhost->queue, &ibmvfc_head); 3921 spin_unlock(&ibmvfc_driver_lock); 3922 3923 ibmvfc_send_crq_init(vhost); 3924 scsi_scan_host(shost); 3925 return 0; 3926 3927 remove_shost: 3928 scsi_remove_host(shost); 3929 release_event_pool: 3930 ibmvfc_free_event_pool(vhost); 3931 release_crq: 3932 ibmvfc_release_crq_queue(vhost); 3933 kill_kthread: 3934 kthread_stop(vhost->work_thread); 3935 free_host_mem: 3936 ibmvfc_free_mem(vhost); 3937 free_scsi_host: 3938 scsi_host_put(shost); 3939 out: 3940 LEAVE; 3941 return rc; 3942 } 3943 3944 /** 3945 * ibmvfc_remove - Adapter hot plug remove entry point 3946 * @vdev: vio device struct 3947 * 3948 * Return value: 3949 * 0 3950 **/ 3951 static int ibmvfc_remove(struct vio_dev *vdev) 3952 { 3953 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev); 3954 unsigned long flags; 3955 3956 ENTER; 3957 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr); 3958 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE); 3959 ibmvfc_wait_while_resetting(vhost); 3960 ibmvfc_release_crq_queue(vhost); 3961 kthread_stop(vhost->work_thread); 3962 fc_remove_host(vhost->host); 3963 scsi_remove_host(vhost->host); 3964 3965 spin_lock_irqsave(vhost->host->host_lock, flags); 3966 ibmvfc_purge_requests(vhost, DID_ERROR); 3967 ibmvfc_free_event_pool(vhost); 3968 spin_unlock_irqrestore(vhost->host->host_lock, flags); 3969 3970 ibmvfc_free_mem(vhost); 3971 spin_lock(&ibmvfc_driver_lock); 3972 list_del(&vhost->queue); 3973 spin_unlock(&ibmvfc_driver_lock); 3974 scsi_host_put(vhost->host); 3975 LEAVE; 3976 return 0; 3977 } 3978 3979 /** 3980 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver 3981 * @vdev: vio device struct 3982 * 3983 * Return value: 3984 * Number of bytes the driver will need to DMA map at the same time in 3985 * order to perform well. 3986 */ 3987 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev) 3988 { 3989 unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu); 3990 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun); 3991 } 3992 3993 static struct vio_device_id ibmvfc_device_table[] __devinitdata = { 3994 {"fcp", "IBM,vfc-client"}, 3995 { "", "" } 3996 }; 3997 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table); 3998 3999 static struct vio_driver ibmvfc_driver = { 4000 .id_table = ibmvfc_device_table, 4001 .probe = ibmvfc_probe, 4002 .remove = ibmvfc_remove, 4003 .get_desired_dma = ibmvfc_get_desired_dma, 4004 .driver = { 4005 .name = IBMVFC_NAME, 4006 .owner = THIS_MODULE, 4007 } 4008 }; 4009 4010 static struct fc_function_template ibmvfc_transport_functions = { 4011 .show_host_fabric_name = 1, 4012 .show_host_node_name = 1, 4013 .show_host_port_name = 1, 4014 .show_host_supported_classes = 1, 4015 .show_host_port_type = 1, 4016 .show_host_port_id = 1, 4017 4018 .get_host_port_state = ibmvfc_get_host_port_state, 4019 .show_host_port_state = 1, 4020 4021 .get_host_speed = ibmvfc_get_host_speed, 4022 .show_host_speed = 1, 4023 4024 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip, 4025 .terminate_rport_io = ibmvfc_terminate_rport_io, 4026 4027 .show_rport_maxframe_size = 1, 4028 .show_rport_supported_classes = 1, 4029 4030 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo, 4031 .show_rport_dev_loss_tmo = 1, 4032 4033 .get_starget_node_name = ibmvfc_get_starget_node_name, 4034 .show_starget_node_name = 1, 4035 4036 .get_starget_port_name = ibmvfc_get_starget_port_name, 4037 .show_starget_port_name = 1, 4038 4039 .get_starget_port_id = ibmvfc_get_starget_port_id, 4040 .show_starget_port_id = 1, 4041 }; 4042 4043 /** 4044 * ibmvfc_module_init - Initialize the ibmvfc module 4045 * 4046 * Return value: 4047 * 0 on success / other on failure 4048 **/ 4049 static int __init ibmvfc_module_init(void) 4050 { 4051 int rc; 4052 4053 if (!firmware_has_feature(FW_FEATURE_VIO)) 4054 return -ENODEV; 4055 4056 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n", 4057 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE); 4058 4059 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions); 4060 if (!ibmvfc_transport_template) 4061 return -ENOMEM; 4062 4063 rc = vio_register_driver(&ibmvfc_driver); 4064 if (rc) 4065 fc_release_transport(ibmvfc_transport_template); 4066 return rc; 4067 } 4068 4069 /** 4070 * ibmvfc_module_exit - Teardown the ibmvfc module 4071 * 4072 * Return value: 4073 * nothing 4074 **/ 4075 static void __exit ibmvfc_module_exit(void) 4076 { 4077 vio_unregister_driver(&ibmvfc_driver); 4078 fc_release_transport(ibmvfc_transport_template); 4079 } 4080 4081 module_init(ibmvfc_module_init); 4082 module_exit(ibmvfc_module_exit); 4083