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 26 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); 27 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); 28 static int zfcp_scsi_slave_configure(struct scsi_device *sdp); 29 static int zfcp_scsi_queuecommand(struct scsi_cmnd *, 30 void (*done) (struct scsi_cmnd *)); 31 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); 32 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); 33 static int zfcp_scsi_eh_bus_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 scsi_transport_template *zfcp_transport_template; 44 45 struct zfcp_data zfcp_data = { 46 .scsi_host_template = { 47 name: ZFCP_NAME, 48 proc_name: "zfcp", 49 proc_info: NULL, 50 detect: NULL, 51 slave_alloc: zfcp_scsi_slave_alloc, 52 slave_configure: zfcp_scsi_slave_configure, 53 slave_destroy: zfcp_scsi_slave_destroy, 54 queuecommand: zfcp_scsi_queuecommand, 55 eh_abort_handler: zfcp_scsi_eh_abort_handler, 56 eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler, 57 eh_bus_reset_handler: zfcp_scsi_eh_bus_reset_handler, 58 eh_host_reset_handler: zfcp_scsi_eh_host_reset_handler, 59 /* FIXME(openfcp): Tune */ 60 can_queue: 4096, 61 this_id: -1, 62 /* 63 * FIXME: 64 * one less? can zfcp_create_sbale cope with it? 65 */ 66 sg_tablesize: ZFCP_MAX_SBALES_PER_REQ, 67 cmd_per_lun: 1, 68 unchecked_isa_dma: 0, 69 use_clustering: 1, 70 sdev_attrs: zfcp_sysfs_sdev_attrs, 71 }, 72 .driver_version = ZFCP_VERSION, 73 /* rest initialised with zeros */ 74 }; 75 76 /* Find start of Response Information in FCP response unit*/ 77 char * 78 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 79 { 80 char *fcp_rsp_info_ptr; 81 82 fcp_rsp_info_ptr = 83 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 84 85 return fcp_rsp_info_ptr; 86 } 87 88 /* Find start of Sense Information in FCP response unit*/ 89 char * 90 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 91 { 92 char *fcp_sns_info_ptr; 93 94 fcp_sns_info_ptr = 95 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 96 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) 97 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + 98 fcp_rsp_iu->fcp_rsp_len; 99 100 return fcp_sns_info_ptr; 101 } 102 103 fcp_dl_t * 104 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) 105 { 106 int additional_length = fcp_cmd->add_fcp_cdb_length << 2; 107 fcp_dl_t *fcp_dl_addr; 108 109 fcp_dl_addr = (fcp_dl_t *) 110 ((unsigned char *) fcp_cmd + 111 sizeof (struct fcp_cmnd_iu) + additional_length); 112 /* 113 * fcp_dl_addr = start address of fcp_cmnd structure + 114 * size of fixed part + size of dynamically sized add_dcp_cdb field 115 * SEE FCP-2 documentation 116 */ 117 return fcp_dl_addr; 118 } 119 120 fcp_dl_t 121 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) 122 { 123 return *zfcp_get_fcp_dl_ptr(fcp_cmd); 124 } 125 126 void 127 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) 128 { 129 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; 130 } 131 132 /* 133 * note: it's a bit-or operation not an assignment 134 * regarding the specified byte 135 */ 136 static inline void 137 set_byte(u32 * result, char status, char pos) 138 { 139 *result |= status << (pos * 8); 140 } 141 142 void 143 set_host_byte(u32 * result, char status) 144 { 145 set_byte(result, status, 2); 146 } 147 148 void 149 set_driver_byte(u32 * result, char status) 150 { 151 set_byte(result, status, 3); 152 } 153 154 static int 155 zfcp_scsi_slave_alloc(struct scsi_device *sdp) 156 { 157 struct zfcp_adapter *adapter; 158 struct zfcp_unit *unit; 159 unsigned long flags; 160 int retval = -ENXIO; 161 162 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; 163 if (!adapter) 164 goto out; 165 166 read_lock_irqsave(&zfcp_data.config_lock, flags); 167 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); 168 if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED, 169 &unit->status)) { 170 sdp->hostdata = unit; 171 unit->device = sdp; 172 zfcp_unit_get(unit); 173 retval = 0; 174 } 175 read_unlock_irqrestore(&zfcp_data.config_lock, flags); 176 out: 177 return retval; 178 } 179 180 static void 181 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) 182 { 183 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; 184 185 if (unit) { 186 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status); 187 sdpnt->hostdata = NULL; 188 unit->device = NULL; 189 zfcp_unit_put(unit); 190 } else { 191 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " 192 "address %p\n", sdpnt); 193 } 194 } 195 196 /* 197 * called from scsi midlayer to allow finetuning of a device. 198 */ 199 static int 200 zfcp_scsi_slave_configure(struct scsi_device *sdp) 201 { 202 if (sdp->tagged_supported) 203 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); 204 else 205 scsi_adjust_queue_depth(sdp, 0, 1); 206 return 0; 207 } 208 209 /** 210 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function 211 * @scpnt: pointer to struct scsi_cmnd where result is set 212 * @result: result to be set in scpnt (e.g. DID_ERROR) 213 */ 214 static void 215 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 216 { 217 set_host_byte(&scpnt->result, result); 218 if ((scpnt->device != NULL) && (scpnt->device->host != NULL)) 219 zfcp_scsi_dbf_event_result("fail", 4, 220 (struct zfcp_adapter*) scpnt->device->host->hostdata[0], 221 scpnt, NULL); 222 /* return directly */ 223 scpnt->scsi_done(scpnt); 224 } 225 226 /** 227 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and 228 * zfcp_scsi_command_sync 229 * @adapter: adapter where scsi command is issued 230 * @unit: unit to which scsi command is sent 231 * @scpnt: scsi command to be sent 232 * @timer: timer to be started if request is successfully initiated 233 * 234 * Note: In scsi_done function must be set in scpnt. 235 */ 236 int 237 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, 238 struct scsi_cmnd *scpnt, struct timer_list *timer) 239 { 240 int tmp; 241 int retval; 242 243 retval = 0; 244 245 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); 246 BUG_ON(scpnt->scsi_done == NULL); 247 248 if (unlikely(NULL == unit)) { 249 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 250 goto out; 251 } 252 253 if (unlikely( 254 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || 255 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { 256 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " 257 "0x%016Lx on adapter %s\n", 258 unit->fcp_lun, unit->port->wwpn, 259 zfcp_get_busid_by_adapter(adapter)); 260 zfcp_scsi_command_fail(scpnt, DID_ERROR); 261 goto out; 262 } 263 264 if (unlikely( 265 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { 266 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " 267 "on port 0x%016Lx in recovery\n", 268 zfcp_get_busid_by_unit(unit), 269 unit->fcp_lun, unit->port->wwpn); 270 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 271 goto out; 272 } 273 274 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer, 275 ZFCP_REQ_AUTO_CLEANUP); 276 277 if (unlikely(tmp < 0)) { 278 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); 279 retval = SCSI_MLQUEUE_HOST_BUSY; 280 } 281 282 out: 283 return retval; 284 } 285 286 void 287 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) 288 { 289 struct completion *wait = (struct completion *) scpnt->SCp.ptr; 290 complete(wait); 291 } 292 293 294 /** 295 * zfcp_scsi_command_sync - send a SCSI command and wait for completion 296 * @unit: unit where command is sent to 297 * @scpnt: scsi command to be sent 298 * @timer: timer to be started if request is successfully initiated 299 * Return: 0 300 * 301 * Errors are indicated in scpnt->result 302 */ 303 int 304 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, 305 struct timer_list *timer) 306 { 307 int ret; 308 DECLARE_COMPLETION(wait); 309 310 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ 311 scpnt->scsi_done = zfcp_scsi_command_sync_handler; 312 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer); 313 if (ret == 0) 314 wait_for_completion(&wait); 315 316 scpnt->SCp.ptr = NULL; 317 318 return 0; 319 } 320 321 /* 322 * function: zfcp_scsi_queuecommand 323 * 324 * purpose: enqueues a SCSI command to the specified target device 325 * 326 * returns: 0 - success, SCSI command enqueued 327 * !0 - failure 328 */ 329 int 330 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, 331 void (*done) (struct scsi_cmnd *)) 332 { 333 struct zfcp_unit *unit; 334 struct zfcp_adapter *adapter; 335 336 /* reset the status for this request */ 337 scpnt->result = 0; 338 scpnt->host_scribble = NULL; 339 scpnt->scsi_done = done; 340 341 /* 342 * figure out adapter and target device 343 * (stored there by zfcp_scsi_slave_alloc) 344 */ 345 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; 346 unit = (struct zfcp_unit *) scpnt->device->hostdata; 347 348 return zfcp_scsi_command_async(adapter, unit, scpnt, NULL); 349 } 350 351 static struct zfcp_unit * 352 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id, 353 unsigned int lun) 354 { 355 struct zfcp_port *port; 356 struct zfcp_unit *unit, *retval = NULL; 357 358 list_for_each_entry(port, &adapter->port_list_head, list) { 359 if (!port->rport || (id != port->rport->scsi_target_id)) 360 continue; 361 list_for_each_entry(unit, &port->unit_list_head, list) { 362 if (lun == unit->scsi_lun) { 363 retval = unit; 364 goto out; 365 } 366 } 367 } 368 out: 369 return retval; 370 } 371 372 /** 373 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command 374 * @scpnt: pointer to scsi_cmnd to be aborted 375 * Return: SUCCESS - command has been aborted and cleaned up in internal 376 * bookkeeping, SCSI stack won't be called for aborted command 377 * FAILED - otherwise 378 * 379 * We do not need to care for a SCSI command which completes normally 380 * but late during this abort routine runs. We are allowed to return 381 * late commands to the SCSI stack. It tracks the state of commands and 382 * will handle late commands. (Usually, the normal completion of late 383 * commands is ignored with respect to the running abort operation.) 384 */ 385 int 386 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 int retval = SUCCESS; 392 struct zfcp_fsf_req *new_fsf_req = NULL; 393 struct zfcp_fsf_req *old_fsf_req; 394 unsigned long flags; 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 /* 407 * Check whether command has just completed and can not be aborted. 408 * Even if the command has just been completed late, we can access 409 * scpnt since the SCSI stack does not release it at least until 410 * this routine returns. (scpnt is parameter passed to this routine 411 * and must not disappear during abort even on late completion.) 412 */ 413 old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble; 414 if (!old_fsf_req) { 415 write_unlock_irqrestore(&adapter->abort_lock, flags); 416 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, NULL); 417 retval = SUCCESS; 418 goto out; 419 } 420 old_fsf_req->data = 0; 421 old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; 422 423 /* don't access old_fsf_req after releasing the abort_lock */ 424 write_unlock_irqrestore(&adapter->abort_lock, flags); 425 /* call FSF routine which does the abort */ 426 new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req, 427 adapter, unit, 0); 428 if (!new_fsf_req) { 429 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n"); 430 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL, 431 old_fsf_req); 432 retval = FAILED; 433 goto out; 434 } 435 436 /* wait for completion of abort */ 437 __wait_event(new_fsf_req->completion_wq, 438 new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 439 440 /* status should be valid since signals were not permitted */ 441 if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { 442 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req, 443 NULL); 444 retval = SUCCESS; 445 } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { 446 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req, 447 NULL); 448 retval = SUCCESS; 449 } else { 450 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req, 451 NULL); 452 retval = FAILED; 453 } 454 zfcp_fsf_req_free(new_fsf_req); 455 out: 456 return retval; 457 } 458 459 int 460 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 461 { 462 int retval; 463 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; 464 465 if (!unit) { 466 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); 467 retval = SUCCESS; 468 goto out; 469 } 470 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); 471 472 /* 473 * If we do not know whether the unit supports 'logical unit reset' 474 * then try 'logical unit reset' and proceed with 'target reset' 475 * if 'logical unit reset' fails. 476 * If the unit is known not to support 'logical unit reset' then 477 * skip 'logical unit reset' and try 'target reset' immediately. 478 */ 479 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 480 &unit->status)) { 481 retval = zfcp_task_management_function(unit, 482 FCP_LOGICAL_UNIT_RESET, 483 scpnt); 484 if (retval) { 485 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); 486 if (retval == -ENOTSUPP) 487 atomic_set_mask 488 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 489 &unit->status); 490 /* fall through and try 'target reset' next */ 491 } else { 492 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", 493 unit); 494 /* avoid 'target reset' */ 495 retval = SUCCESS; 496 goto out; 497 } 498 } 499 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt); 500 if (retval) { 501 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); 502 retval = FAILED; 503 } else { 504 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); 505 retval = SUCCESS; 506 } 507 out: 508 return retval; 509 } 510 511 static int 512 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags, 513 struct scsi_cmnd *scpnt) 514 { 515 struct zfcp_adapter *adapter = unit->port->adapter; 516 struct zfcp_fsf_req *fsf_req; 517 int retval = 0; 518 519 /* issue task management function */ 520 fsf_req = zfcp_fsf_send_fcp_command_task_management 521 (adapter, unit, tm_flags, 0); 522 if (!fsf_req) { 523 ZFCP_LOG_INFO("error: creation of task management request " 524 "failed for unit 0x%016Lx on port 0x%016Lx on " 525 "adapter %s\n", unit->fcp_lun, unit->port->wwpn, 526 zfcp_get_busid_by_adapter(adapter)); 527 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt); 528 retval = -ENOMEM; 529 goto out; 530 } 531 532 __wait_event(fsf_req->completion_wq, 533 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 534 535 /* 536 * check completion status of task management function 537 */ 538 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 539 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt); 540 retval = -EIO; 541 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) { 542 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt); 543 retval = -ENOTSUPP; 544 } else 545 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt); 546 547 zfcp_fsf_req_free(fsf_req); 548 out: 549 return retval; 550 } 551 552 /** 553 * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter) 554 */ 555 int 556 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt) 557 { 558 struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata; 559 struct zfcp_adapter *adapter = unit->port->adapter; 560 561 ZFCP_LOG_NORMAL("bus reset because of problems with " 562 "unit 0x%016Lx\n", unit->fcp_lun); 563 zfcp_erp_adapter_reopen(adapter, 0); 564 zfcp_erp_wait(adapter); 565 566 return SUCCESS; 567 } 568 569 /** 570 * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter) 571 */ 572 int 573 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 574 { 575 struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata; 576 struct zfcp_adapter *adapter = unit->port->adapter; 577 578 ZFCP_LOG_NORMAL("host reset because of problems with " 579 "unit 0x%016Lx\n", unit->fcp_lun); 580 zfcp_erp_adapter_reopen(adapter, 0); 581 zfcp_erp_wait(adapter); 582 583 return SUCCESS; 584 } 585 586 int 587 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) 588 { 589 int retval = 0; 590 static unsigned int unique_id = 0; 591 592 /* register adapter as SCSI host with mid layer of SCSI stack */ 593 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, 594 sizeof (struct zfcp_adapter *)); 595 if (!adapter->scsi_host) { 596 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " 597 "for adapter %s ", 598 zfcp_get_busid_by_adapter(adapter)); 599 retval = -EIO; 600 goto out; 601 } 602 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); 603 604 /* tell the SCSI stack some characteristics of this adapter */ 605 adapter->scsi_host->max_id = 1; 606 adapter->scsi_host->max_lun = 1; 607 adapter->scsi_host->max_channel = 0; 608 adapter->scsi_host->unique_id = unique_id++; /* FIXME */ 609 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; 610 adapter->scsi_host->transportt = zfcp_transport_template; 611 612 /* 613 * save a pointer to our own adapter data structure within 614 * hostdata field of SCSI host data structure 615 */ 616 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 617 618 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 619 scsi_host_put(adapter->scsi_host); 620 retval = -EIO; 621 goto out; 622 } 623 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 624 out: 625 return retval; 626 } 627 628 void 629 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) 630 { 631 struct Scsi_Host *shost; 632 struct zfcp_port *port; 633 634 shost = adapter->scsi_host; 635 if (!shost) 636 return; 637 read_lock_irq(&zfcp_data.config_lock); 638 list_for_each_entry(port, &adapter->port_list_head, list) 639 if (port->rport) 640 port->rport = NULL; 641 read_unlock_irq(&zfcp_data.config_lock); 642 fc_remove_host(shost); 643 scsi_remove_host(shost); 644 scsi_host_put(shost); 645 adapter->scsi_host = NULL; 646 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 647 648 return; 649 } 650 651 652 void 653 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter) 654 { 655 adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler; 656 adapter->scsi_er_timer.data = (unsigned long) adapter; 657 adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT; 658 add_timer(&adapter->scsi_er_timer); 659 } 660 661 /* 662 * Support functions for FC transport class 663 */ 664 static struct fc_host_statistics* 665 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 666 { 667 struct fc_host_statistics *fc_stats; 668 669 if (!adapter->fc_stats) { 670 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 671 if (!fc_stats) 672 return NULL; 673 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */ 674 } 675 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 676 return adapter->fc_stats; 677 } 678 679 static void 680 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 681 struct fsf_qtcb_bottom_port *data, 682 struct fsf_qtcb_bottom_port *old) 683 { 684 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset - 685 old->seconds_since_last_reset; 686 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 687 fc_stats->tx_words = data->tx_words - old->tx_words; 688 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 689 fc_stats->rx_words = data->rx_words - old->rx_words; 690 fc_stats->lip_count = data->lip - old->lip; 691 fc_stats->nos_count = data->nos - old->nos; 692 fc_stats->error_frames = data->error_frames - old->error_frames; 693 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 694 fc_stats->link_failure_count = data->link_failure - old->link_failure; 695 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 696 fc_stats->loss_of_signal_count = data->loss_of_signal - 697 old->loss_of_signal; 698 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts - 699 old->psp_error_counts; 700 fc_stats->invalid_tx_word_count = data->invalid_tx_words - 701 old->invalid_tx_words; 702 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 703 fc_stats->fcp_input_requests = data->input_requests - 704 old->input_requests; 705 fc_stats->fcp_output_requests = data->output_requests - 706 old->output_requests; 707 fc_stats->fcp_control_requests = data->control_requests - 708 old->control_requests; 709 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 710 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 711 } 712 713 static void 714 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 715 struct fsf_qtcb_bottom_port *data) 716 { 717 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 718 fc_stats->tx_frames = data->tx_frames; 719 fc_stats->tx_words = data->tx_words; 720 fc_stats->rx_frames = data->rx_frames; 721 fc_stats->rx_words = data->rx_words; 722 fc_stats->lip_count = data->lip; 723 fc_stats->nos_count = data->nos; 724 fc_stats->error_frames = data->error_frames; 725 fc_stats->dumped_frames = data->dumped_frames; 726 fc_stats->link_failure_count = data->link_failure; 727 fc_stats->loss_of_sync_count = data->loss_of_sync; 728 fc_stats->loss_of_signal_count = data->loss_of_signal; 729 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 730 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 731 fc_stats->invalid_crc_count = data->invalid_crcs; 732 fc_stats->fcp_input_requests = data->input_requests; 733 fc_stats->fcp_output_requests = data->output_requests; 734 fc_stats->fcp_control_requests = data->control_requests; 735 fc_stats->fcp_input_megabytes = data->input_mb; 736 fc_stats->fcp_output_megabytes = data->output_mb; 737 } 738 739 /** 740 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc 741 * 742 * assumption: scsi_transport_fc synchronizes calls of 743 * get_fc_host_stats and reset_fc_host_stats 744 * (XXX to be checked otherwise introduce locking) 745 */ 746 static struct fc_host_statistics * 747 zfcp_get_fc_host_stats(struct Scsi_Host *shost) 748 { 749 struct zfcp_adapter *adapter; 750 struct fc_host_statistics *fc_stats; 751 struct fsf_qtcb_bottom_port *data; 752 int ret; 753 754 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 755 fc_stats = zfcp_init_fc_host_stats(adapter); 756 if (!fc_stats) 757 return NULL; 758 759 data = kzalloc(sizeof(*data), GFP_KERNEL); 760 if (!data) 761 return NULL; 762 763 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); 764 if (ret) { 765 kfree(data); 766 return NULL; /* XXX return zeroed fc_stats? */ 767 } 768 769 if (adapter->stats_reset && 770 ((jiffies/HZ - adapter->stats_reset) < 771 data->seconds_since_last_reset)) { 772 zfcp_adjust_fc_host_stats(fc_stats, data, 773 adapter->stats_reset_data); 774 } else 775 zfcp_set_fc_host_stats(fc_stats, data); 776 777 kfree(data); 778 return fc_stats; 779 } 780 781 static void 782 zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 783 { 784 struct zfcp_adapter *adapter; 785 struct fsf_qtcb_bottom_port *data, *old_data; 786 int ret; 787 788 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 789 data = kzalloc(sizeof(*data), GFP_KERNEL); 790 if (!data) 791 return; 792 793 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); 794 if (ret == 0) { 795 adapter->stats_reset = jiffies/HZ; 796 old_data = adapter->stats_reset_data; 797 adapter->stats_reset_data = data; /* finally freed in 798 adater_dequeue */ 799 kfree(old_data); 800 } 801 } 802 803 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 804 { 805 rport->dev_loss_tmo = timeout; 806 } 807 808 struct fc_function_template zfcp_transport_functions = { 809 .show_starget_port_id = 1, 810 .show_starget_port_name = 1, 811 .show_starget_node_name = 1, 812 .show_rport_supported_classes = 1, 813 .show_rport_maxframe_size = 1, 814 .show_rport_dev_loss_tmo = 1, 815 .show_host_node_name = 1, 816 .show_host_port_name = 1, 817 .show_host_permanent_port_name = 1, 818 .show_host_supported_classes = 1, 819 .show_host_supported_speeds = 1, 820 .show_host_maxframe_size = 1, 821 .show_host_serial_number = 1, 822 .get_fc_host_stats = zfcp_get_fc_host_stats, 823 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 824 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 825 /* no functions registered for following dynamic attributes but 826 directly set by LLDD */ 827 .show_host_port_type = 1, 828 .show_host_speed = 1, 829 .show_host_port_id = 1, 830 }; 831 832 /** 833 * ZFCP_DEFINE_SCSI_ATTR 834 * @_name: name of show attribute 835 * @_format: format string 836 * @_value: value to print 837 * 838 * Generates attribute for a unit. 839 */ 840 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ 841 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ 842 char *buf) \ 843 { \ 844 struct scsi_device *sdev; \ 845 struct zfcp_unit *unit; \ 846 \ 847 sdev = to_scsi_device(dev); \ 848 unit = sdev->hostdata; \ 849 return sprintf(buf, _format, _value); \ 850 } \ 851 \ 852 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); 853 854 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); 855 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); 856 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); 857 858 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { 859 &dev_attr_fcp_lun, 860 &dev_attr_wwpn, 861 &dev_attr_hba_id, 862 NULL 863 }; 864 865 #undef ZFCP_LOG_AREA 866