1 /* 2 * This file is part of the zfcp device driver for 3 * FCP adapters for IBM System z9 and zSeries. 4 * 5 * (C) Copyright IBM Corp. 2002, 2006 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI 23 24 #include "zfcp_ext.h" 25 #include <asm/atomic.h> 26 27 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); 28 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); 29 static int zfcp_scsi_slave_configure(struct scsi_device *sdp); 30 static int zfcp_scsi_queuecommand(struct scsi_cmnd *, 31 void (*done) (struct scsi_cmnd *)); 32 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); 33 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); 34 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); 35 static int zfcp_task_management_function(struct zfcp_unit *, u8, 36 struct scsi_cmnd *); 37 38 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, 39 unsigned int, unsigned int); 40 41 static struct device_attribute *zfcp_sysfs_sdev_attrs[]; 42 43 struct zfcp_data zfcp_data = { 44 .scsi_host_template = { 45 .name = ZFCP_NAME, 46 .module = THIS_MODULE, 47 .proc_name = "zfcp", 48 .slave_alloc = zfcp_scsi_slave_alloc, 49 .slave_configure = zfcp_scsi_slave_configure, 50 .slave_destroy = zfcp_scsi_slave_destroy, 51 .queuecommand = zfcp_scsi_queuecommand, 52 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 53 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 54 .eh_bus_reset_handler = zfcp_scsi_eh_host_reset_handler, 55 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 56 .can_queue = 4096, 57 .this_id = -1, 58 .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ, 59 .cmd_per_lun = 1, 60 .use_clustering = 1, 61 .sdev_attrs = zfcp_sysfs_sdev_attrs, 62 .max_sectors = ZFCP_MAX_SECTORS, 63 }, 64 .driver_version = ZFCP_VERSION, 65 }; 66 67 /* Find start of Response Information in FCP response unit*/ 68 char * 69 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 70 { 71 char *fcp_rsp_info_ptr; 72 73 fcp_rsp_info_ptr = 74 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 75 76 return fcp_rsp_info_ptr; 77 } 78 79 /* Find start of Sense Information in FCP response unit*/ 80 char * 81 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 82 { 83 char *fcp_sns_info_ptr; 84 85 fcp_sns_info_ptr = 86 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 87 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) 88 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + 89 fcp_rsp_iu->fcp_rsp_len; 90 91 return fcp_sns_info_ptr; 92 } 93 94 static fcp_dl_t * 95 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) 96 { 97 int additional_length = fcp_cmd->add_fcp_cdb_length << 2; 98 fcp_dl_t *fcp_dl_addr; 99 100 fcp_dl_addr = (fcp_dl_t *) 101 ((unsigned char *) fcp_cmd + 102 sizeof (struct fcp_cmnd_iu) + additional_length); 103 /* 104 * fcp_dl_addr = start address of fcp_cmnd structure + 105 * size of fixed part + size of dynamically sized add_dcp_cdb field 106 * SEE FCP-2 documentation 107 */ 108 return fcp_dl_addr; 109 } 110 111 fcp_dl_t 112 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) 113 { 114 return *zfcp_get_fcp_dl_ptr(fcp_cmd); 115 } 116 117 void 118 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) 119 { 120 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; 121 } 122 123 /* 124 * note: it's a bit-or operation not an assignment 125 * regarding the specified byte 126 */ 127 static inline void 128 set_byte(int *result, char status, char pos) 129 { 130 *result |= status << (pos * 8); 131 } 132 133 void 134 set_host_byte(int *result, char status) 135 { 136 set_byte(result, status, 2); 137 } 138 139 void 140 set_driver_byte(int *result, char status) 141 { 142 set_byte(result, status, 3); 143 } 144 145 static int 146 zfcp_scsi_slave_alloc(struct scsi_device *sdp) 147 { 148 struct zfcp_adapter *adapter; 149 struct zfcp_unit *unit; 150 unsigned long flags; 151 int retval = -ENXIO; 152 153 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; 154 if (!adapter) 155 goto out; 156 157 read_lock_irqsave(&zfcp_data.config_lock, flags); 158 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); 159 if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED, 160 &unit->status)) { 161 sdp->hostdata = unit; 162 unit->device = sdp; 163 zfcp_unit_get(unit); 164 retval = 0; 165 } 166 read_unlock_irqrestore(&zfcp_data.config_lock, flags); 167 out: 168 return retval; 169 } 170 171 /** 172 * zfcp_scsi_slave_destroy - called when scsi device is removed 173 * 174 * Remove reference to associated scsi device for an zfcp_unit. 175 * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs 176 * or a scan for this device might have failed. 177 */ 178 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) 179 { 180 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; 181 182 if (unit) { 183 zfcp_erp_wait(unit->port->adapter); 184 wait_event(unit->scsi_scan_wq, 185 atomic_test_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, 186 &unit->status) == 0); 187 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status); 188 sdpnt->hostdata = NULL; 189 unit->device = NULL; 190 zfcp_erp_unit_failed(unit); 191 zfcp_unit_put(unit); 192 } else 193 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " 194 "address %p\n", sdpnt); 195 } 196 197 /* 198 * called from scsi midlayer to allow finetuning of a device. 199 */ 200 static int 201 zfcp_scsi_slave_configure(struct scsi_device *sdp) 202 { 203 if (sdp->tagged_supported) 204 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); 205 else 206 scsi_adjust_queue_depth(sdp, 0, 1); 207 return 0; 208 } 209 210 /** 211 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function 212 * @scpnt: pointer to struct scsi_cmnd where result is set 213 * @result: result to be set in scpnt (e.g. DID_ERROR) 214 */ 215 static void 216 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 217 { 218 set_host_byte(&scpnt->result, result); 219 if ((scpnt->device != NULL) && (scpnt->device->host != NULL)) 220 zfcp_scsi_dbf_event_result("fail", 4, 221 (struct zfcp_adapter*) scpnt->device->host->hostdata[0], 222 scpnt, NULL); 223 /* return directly */ 224 scpnt->scsi_done(scpnt); 225 } 226 227 /** 228 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and 229 * zfcp_scsi_command_sync 230 * @adapter: adapter where scsi command is issued 231 * @unit: unit to which scsi command is sent 232 * @scpnt: scsi command to be sent 233 * @timer: timer to be started if request is successfully initiated 234 * 235 * Note: In scsi_done function must be set in scpnt. 236 */ 237 int 238 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, 239 struct scsi_cmnd *scpnt, int use_timer) 240 { 241 int tmp; 242 int retval; 243 244 retval = 0; 245 246 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); 247 BUG_ON(scpnt->scsi_done == NULL); 248 249 if (unlikely(NULL == unit)) { 250 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 251 goto out; 252 } 253 254 if (unlikely( 255 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || 256 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { 257 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " 258 "0x%016Lx on adapter %s\n", 259 unit->fcp_lun, unit->port->wwpn, 260 zfcp_get_busid_by_adapter(adapter)); 261 zfcp_scsi_command_fail(scpnt, DID_ERROR); 262 goto out; 263 } 264 265 if (unlikely( 266 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { 267 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " 268 "on port 0x%016Lx in recovery\n", 269 zfcp_get_busid_by_unit(unit), 270 unit->fcp_lun, unit->port->wwpn); 271 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 272 goto out; 273 } 274 275 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer, 276 ZFCP_REQ_AUTO_CLEANUP); 277 278 if (unlikely(tmp < 0)) { 279 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); 280 retval = SCSI_MLQUEUE_HOST_BUSY; 281 } 282 283 out: 284 return retval; 285 } 286 287 static void 288 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) 289 { 290 struct completion *wait = (struct completion *) scpnt->SCp.ptr; 291 complete(wait); 292 } 293 294 295 /** 296 * zfcp_scsi_command_sync - send a SCSI command and wait for completion 297 * @unit: unit where command is sent to 298 * @scpnt: scsi command to be sent 299 * @use_timer: indicates whether timer should be setup or not 300 * Return: 0 301 * 302 * Errors are indicated in scpnt->result 303 */ 304 int 305 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, 306 int use_timer) 307 { 308 int ret; 309 DECLARE_COMPLETION_ONSTACK(wait); 310 311 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ 312 scpnt->scsi_done = zfcp_scsi_command_sync_handler; 313 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, 314 use_timer); 315 if (ret == 0) 316 wait_for_completion(&wait); 317 318 scpnt->SCp.ptr = NULL; 319 320 return 0; 321 } 322 323 /* 324 * function: zfcp_scsi_queuecommand 325 * 326 * purpose: enqueues a SCSI command to the specified target device 327 * 328 * returns: 0 - success, SCSI command enqueued 329 * !0 - failure 330 */ 331 static int 332 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, 333 void (*done) (struct scsi_cmnd *)) 334 { 335 struct zfcp_unit *unit; 336 struct zfcp_adapter *adapter; 337 338 /* reset the status for this request */ 339 scpnt->result = 0; 340 scpnt->host_scribble = NULL; 341 scpnt->scsi_done = done; 342 343 /* 344 * figure out adapter and target device 345 * (stored there by zfcp_scsi_slave_alloc) 346 */ 347 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; 348 unit = (struct zfcp_unit *) scpnt->device->hostdata; 349 350 return zfcp_scsi_command_async(adapter, unit, scpnt, 0); 351 } 352 353 static struct zfcp_unit * 354 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id, 355 unsigned int lun) 356 { 357 struct zfcp_port *port; 358 struct zfcp_unit *unit, *retval = NULL; 359 360 list_for_each_entry(port, &adapter->port_list_head, list) { 361 if (!port->rport || (id != port->rport->scsi_target_id)) 362 continue; 363 list_for_each_entry(unit, &port->unit_list_head, list) 364 if (lun == unit->scsi_lun) { 365 retval = unit; 366 goto out; 367 } 368 } 369 out: 370 return retval; 371 } 372 373 /** 374 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command 375 * @scpnt: pointer to scsi_cmnd to be aborted 376 * Return: SUCCESS - command has been aborted and cleaned up in internal 377 * bookkeeping, SCSI stack won't be called for aborted command 378 * FAILED - otherwise 379 * 380 * We do not need to care for a SCSI command which completes normally 381 * but late during this abort routine runs. We are allowed to return 382 * late commands to the SCSI stack. It tracks the state of commands and 383 * will handle late commands. (Usually, the normal completion of late 384 * commands is ignored with respect to the running abort operation.) 385 */ 386 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 387 { 388 struct Scsi_Host *scsi_host; 389 struct zfcp_adapter *adapter; 390 struct zfcp_unit *unit; 391 struct zfcp_fsf_req *fsf_req; 392 unsigned long flags; 393 unsigned long old_req_id; 394 int retval = SUCCESS; 395 396 scsi_host = scpnt->device->host; 397 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; 398 unit = (struct zfcp_unit *) scpnt->device->hostdata; 399 400 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", 401 scpnt, zfcp_get_busid_by_adapter(adapter)); 402 403 /* avoid race condition between late normal completion and abort */ 404 write_lock_irqsave(&adapter->abort_lock, flags); 405 406 /* Check whether corresponding fsf_req is still pending */ 407 spin_lock(&adapter->req_list_lock); 408 fsf_req = zfcp_reqlist_find(adapter, 409 (unsigned long) scpnt->host_scribble); 410 spin_unlock(&adapter->req_list_lock); 411 if (!fsf_req) { 412 write_unlock_irqrestore(&adapter->abort_lock, flags); 413 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0); 414 retval = SUCCESS; 415 goto out; 416 } 417 fsf_req->data = 0; 418 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; 419 old_req_id = fsf_req->req_id; 420 421 /* don't access old fsf_req after releasing the abort_lock */ 422 write_unlock_irqrestore(&adapter->abort_lock, flags); 423 424 fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0); 425 if (!fsf_req) { 426 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n"); 427 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL, 428 old_req_id); 429 retval = FAILED; 430 goto out; 431 } 432 433 __wait_event(fsf_req->completion_wq, 434 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 435 436 if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { 437 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0); 438 retval = SUCCESS; 439 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { 440 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0); 441 retval = SUCCESS; 442 } else { 443 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0); 444 retval = FAILED; 445 } 446 zfcp_fsf_req_free(fsf_req); 447 out: 448 return retval; 449 } 450 451 static int 452 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 453 { 454 int retval; 455 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; 456 457 if (!unit) { 458 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); 459 retval = SUCCESS; 460 goto out; 461 } 462 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); 463 464 /* 465 * If we do not know whether the unit supports 'logical unit reset' 466 * then try 'logical unit reset' and proceed with 'target reset' 467 * if 'logical unit reset' fails. 468 * If the unit is known not to support 'logical unit reset' then 469 * skip 'logical unit reset' and try 'target reset' immediately. 470 */ 471 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 472 &unit->status)) { 473 retval = zfcp_task_management_function(unit, 474 FCP_LOGICAL_UNIT_RESET, 475 scpnt); 476 if (retval) { 477 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); 478 if (retval == -ENOTSUPP) 479 atomic_set_mask 480 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 481 &unit->status); 482 /* fall through and try 'target reset' next */ 483 } else { 484 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", 485 unit); 486 /* avoid 'target reset' */ 487 retval = SUCCESS; 488 goto out; 489 } 490 } 491 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt); 492 if (retval) { 493 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); 494 retval = FAILED; 495 } else { 496 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); 497 retval = SUCCESS; 498 } 499 out: 500 return retval; 501 } 502 503 static int 504 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags, 505 struct scsi_cmnd *scpnt) 506 { 507 struct zfcp_adapter *adapter = unit->port->adapter; 508 struct zfcp_fsf_req *fsf_req; 509 int retval = 0; 510 511 /* issue task management function */ 512 fsf_req = zfcp_fsf_send_fcp_command_task_management 513 (adapter, unit, tm_flags, 0); 514 if (!fsf_req) { 515 ZFCP_LOG_INFO("error: creation of task management request " 516 "failed for unit 0x%016Lx on port 0x%016Lx on " 517 "adapter %s\n", unit->fcp_lun, unit->port->wwpn, 518 zfcp_get_busid_by_adapter(adapter)); 519 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt); 520 retval = -ENOMEM; 521 goto out; 522 } 523 524 __wait_event(fsf_req->completion_wq, 525 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 526 527 /* 528 * check completion status of task management function 529 */ 530 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 531 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt); 532 retval = -EIO; 533 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) { 534 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt); 535 retval = -ENOTSUPP; 536 } else 537 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt); 538 539 zfcp_fsf_req_free(fsf_req); 540 out: 541 return retval; 542 } 543 544 /** 545 * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset 546 */ 547 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 548 { 549 struct zfcp_unit *unit; 550 struct zfcp_adapter *adapter; 551 552 unit = (struct zfcp_unit*) scpnt->device->hostdata; 553 adapter = unit->port->adapter; 554 555 ZFCP_LOG_NORMAL("host/bus reset because of problems with " 556 "unit 0x%016Lx\n", unit->fcp_lun); 557 558 zfcp_erp_adapter_reopen(adapter, 0); 559 zfcp_erp_wait(adapter); 560 561 return SUCCESS; 562 } 563 564 int 565 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) 566 { 567 int retval = 0; 568 static unsigned int unique_id = 0; 569 570 if (adapter->scsi_host) 571 goto out; 572 573 /* register adapter as SCSI host with mid layer of SCSI stack */ 574 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, 575 sizeof (struct zfcp_adapter *)); 576 if (!adapter->scsi_host) { 577 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " 578 "for adapter %s ", 579 zfcp_get_busid_by_adapter(adapter)); 580 retval = -EIO; 581 goto out; 582 } 583 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); 584 585 /* tell the SCSI stack some characteristics of this adapter */ 586 adapter->scsi_host->max_id = 1; 587 adapter->scsi_host->max_lun = 1; 588 adapter->scsi_host->max_channel = 0; 589 adapter->scsi_host->unique_id = unique_id++; /* FIXME */ 590 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; 591 adapter->scsi_host->transportt = zfcp_data.scsi_transport_template; 592 593 /* 594 * save a pointer to our own adapter data structure within 595 * hostdata field of SCSI host data structure 596 */ 597 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 598 599 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 600 scsi_host_put(adapter->scsi_host); 601 retval = -EIO; 602 goto out; 603 } 604 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 605 out: 606 return retval; 607 } 608 609 void 610 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) 611 { 612 struct Scsi_Host *shost; 613 struct zfcp_port *port; 614 615 shost = adapter->scsi_host; 616 if (!shost) 617 return; 618 read_lock_irq(&zfcp_data.config_lock); 619 list_for_each_entry(port, &adapter->port_list_head, list) 620 if (port->rport) 621 port->rport = NULL; 622 read_unlock_irq(&zfcp_data.config_lock); 623 fc_remove_host(shost); 624 scsi_remove_host(shost); 625 scsi_host_put(shost); 626 adapter->scsi_host = NULL; 627 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 628 629 return; 630 } 631 632 /* 633 * Support functions for FC transport class 634 */ 635 static struct fc_host_statistics* 636 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 637 { 638 struct fc_host_statistics *fc_stats; 639 640 if (!adapter->fc_stats) { 641 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 642 if (!fc_stats) 643 return NULL; 644 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */ 645 } 646 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 647 return adapter->fc_stats; 648 } 649 650 static void 651 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 652 struct fsf_qtcb_bottom_port *data, 653 struct fsf_qtcb_bottom_port *old) 654 { 655 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset - 656 old->seconds_since_last_reset; 657 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 658 fc_stats->tx_words = data->tx_words - old->tx_words; 659 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 660 fc_stats->rx_words = data->rx_words - old->rx_words; 661 fc_stats->lip_count = data->lip - old->lip; 662 fc_stats->nos_count = data->nos - old->nos; 663 fc_stats->error_frames = data->error_frames - old->error_frames; 664 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 665 fc_stats->link_failure_count = data->link_failure - old->link_failure; 666 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 667 fc_stats->loss_of_signal_count = data->loss_of_signal - 668 old->loss_of_signal; 669 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts - 670 old->psp_error_counts; 671 fc_stats->invalid_tx_word_count = data->invalid_tx_words - 672 old->invalid_tx_words; 673 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 674 fc_stats->fcp_input_requests = data->input_requests - 675 old->input_requests; 676 fc_stats->fcp_output_requests = data->output_requests - 677 old->output_requests; 678 fc_stats->fcp_control_requests = data->control_requests - 679 old->control_requests; 680 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 681 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 682 } 683 684 static void 685 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 686 struct fsf_qtcb_bottom_port *data) 687 { 688 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 689 fc_stats->tx_frames = data->tx_frames; 690 fc_stats->tx_words = data->tx_words; 691 fc_stats->rx_frames = data->rx_frames; 692 fc_stats->rx_words = data->rx_words; 693 fc_stats->lip_count = data->lip; 694 fc_stats->nos_count = data->nos; 695 fc_stats->error_frames = data->error_frames; 696 fc_stats->dumped_frames = data->dumped_frames; 697 fc_stats->link_failure_count = data->link_failure; 698 fc_stats->loss_of_sync_count = data->loss_of_sync; 699 fc_stats->loss_of_signal_count = data->loss_of_signal; 700 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 701 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 702 fc_stats->invalid_crc_count = data->invalid_crcs; 703 fc_stats->fcp_input_requests = data->input_requests; 704 fc_stats->fcp_output_requests = data->output_requests; 705 fc_stats->fcp_control_requests = data->control_requests; 706 fc_stats->fcp_input_megabytes = data->input_mb; 707 fc_stats->fcp_output_megabytes = data->output_mb; 708 } 709 710 /** 711 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc 712 * 713 * assumption: scsi_transport_fc synchronizes calls of 714 * get_fc_host_stats and reset_fc_host_stats 715 * (XXX to be checked otherwise introduce locking) 716 */ 717 static struct fc_host_statistics * 718 zfcp_get_fc_host_stats(struct Scsi_Host *shost) 719 { 720 struct zfcp_adapter *adapter; 721 struct fc_host_statistics *fc_stats; 722 struct fsf_qtcb_bottom_port *data; 723 int ret; 724 725 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 726 fc_stats = zfcp_init_fc_host_stats(adapter); 727 if (!fc_stats) 728 return NULL; 729 730 data = kzalloc(sizeof(*data), GFP_KERNEL); 731 if (!data) 732 return NULL; 733 734 ret = zfcp_fsf_exchange_port_data_sync(adapter, data); 735 if (ret) { 736 kfree(data); 737 return NULL; /* XXX return zeroed fc_stats? */ 738 } 739 740 if (adapter->stats_reset && 741 ((jiffies/HZ - adapter->stats_reset) < 742 data->seconds_since_last_reset)) { 743 zfcp_adjust_fc_host_stats(fc_stats, data, 744 adapter->stats_reset_data); 745 } else 746 zfcp_set_fc_host_stats(fc_stats, data); 747 748 kfree(data); 749 return fc_stats; 750 } 751 752 static void 753 zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 754 { 755 struct zfcp_adapter *adapter; 756 struct fsf_qtcb_bottom_port *data, *old_data; 757 int ret; 758 759 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 760 data = kzalloc(sizeof(*data), GFP_KERNEL); 761 if (!data) 762 return; 763 764 ret = zfcp_fsf_exchange_port_data_sync(adapter, data); 765 if (ret) { 766 kfree(data); 767 } else { 768 adapter->stats_reset = jiffies/HZ; 769 old_data = adapter->stats_reset_data; 770 adapter->stats_reset_data = data; /* finally freed in 771 adater_dequeue */ 772 kfree(old_data); 773 } 774 } 775 776 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 777 { 778 rport->dev_loss_tmo = timeout; 779 } 780 781 struct fc_function_template zfcp_transport_functions = { 782 .show_starget_port_id = 1, 783 .show_starget_port_name = 1, 784 .show_starget_node_name = 1, 785 .show_rport_supported_classes = 1, 786 .show_rport_maxframe_size = 1, 787 .show_rport_dev_loss_tmo = 1, 788 .show_host_node_name = 1, 789 .show_host_port_name = 1, 790 .show_host_permanent_port_name = 1, 791 .show_host_supported_classes = 1, 792 .show_host_supported_speeds = 1, 793 .show_host_maxframe_size = 1, 794 .show_host_serial_number = 1, 795 .get_fc_host_stats = zfcp_get_fc_host_stats, 796 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 797 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 798 /* no functions registered for following dynamic attributes but 799 directly set by LLDD */ 800 .show_host_port_type = 1, 801 .show_host_speed = 1, 802 .show_host_port_id = 1, 803 .disable_target_scan = 1, 804 }; 805 806 /** 807 * ZFCP_DEFINE_SCSI_ATTR 808 * @_name: name of show attribute 809 * @_format: format string 810 * @_value: value to print 811 * 812 * Generates attribute for a unit. 813 */ 814 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ 815 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ 816 char *buf) \ 817 { \ 818 struct scsi_device *sdev; \ 819 struct zfcp_unit *unit; \ 820 \ 821 sdev = to_scsi_device(dev); \ 822 unit = sdev->hostdata; \ 823 return sprintf(buf, _format, _value); \ 824 } \ 825 \ 826 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); 827 828 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); 829 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); 830 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); 831 832 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { 833 &dev_attr_fcp_lun, 834 &dev_attr_wwpn, 835 &dev_attr_hba_id, 836 NULL 837 }; 838 839 #undef ZFCP_LOG_AREA 840