1 /* 2 * 3 * linux/drivers/s390/scsi/zfcp_scsi.c 4 * 5 * FCP adapter driver for IBM eServer zSeries 6 * 7 * (C) Copyright IBM Corp. 2002, 2004 8 * 9 * Author(s): Martin Peschke <mpeschke@de.ibm.com> 10 * Raimund Schroeder <raimund.schroeder@de.ibm.com> 11 * Aron Zeh 12 * Wolfgang Taphorn 13 * Stefan Bader <stefan.bader@de.ibm.com> 14 * Heiko Carstens <heiko.carstens@de.ibm.com> 15 * Andreas Herrmann <aherrman@de.ibm.com> 16 * 17 * This program is free software; you can redistribute it and/or modify 18 * it under the terms of the GNU General Public License as published by 19 * the Free Software Foundation; either version 2, or (at your option) 20 * any later version. 21 * 22 * This program is distributed in the hope that it will be useful, 23 * but WITHOUT ANY WARRANTY; without even the implied warranty of 24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 25 * GNU General Public License for more details. 26 * 27 * You should have received a copy of the GNU General Public License 28 * along with this program; if not, write to the Free Software 29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 30 */ 31 32 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI 33 34 #include "zfcp_ext.h" 35 36 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); 37 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); 38 static int zfcp_scsi_slave_configure(struct scsi_device *sdp); 39 static int zfcp_scsi_queuecommand(struct scsi_cmnd *, 40 void (*done) (struct scsi_cmnd *)); 41 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); 42 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); 43 static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *); 44 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); 45 static int zfcp_task_management_function(struct zfcp_unit *, u8, 46 struct scsi_cmnd *); 47 48 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t, 49 scsi_lun_t); 50 51 static struct device_attribute *zfcp_sysfs_sdev_attrs[]; 52 53 struct scsi_transport_template *zfcp_transport_template; 54 55 struct zfcp_data zfcp_data = { 56 .scsi_host_template = { 57 name: ZFCP_NAME, 58 proc_name: "zfcp", 59 proc_info: NULL, 60 detect: NULL, 61 slave_alloc: zfcp_scsi_slave_alloc, 62 slave_configure: zfcp_scsi_slave_configure, 63 slave_destroy: zfcp_scsi_slave_destroy, 64 queuecommand: zfcp_scsi_queuecommand, 65 eh_abort_handler: zfcp_scsi_eh_abort_handler, 66 eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler, 67 eh_bus_reset_handler: zfcp_scsi_eh_bus_reset_handler, 68 eh_host_reset_handler: zfcp_scsi_eh_host_reset_handler, 69 /* FIXME(openfcp): Tune */ 70 can_queue: 4096, 71 this_id: -1, 72 /* 73 * FIXME: 74 * one less? can zfcp_create_sbale cope with it? 75 */ 76 sg_tablesize: ZFCP_MAX_SBALES_PER_REQ, 77 cmd_per_lun: 1, 78 unchecked_isa_dma: 0, 79 use_clustering: 1, 80 sdev_attrs: zfcp_sysfs_sdev_attrs, 81 }, 82 .driver_version = ZFCP_VERSION, 83 /* rest initialised with zeros */ 84 }; 85 86 /* Find start of Response Information in FCP response unit*/ 87 char * 88 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 89 { 90 char *fcp_rsp_info_ptr; 91 92 fcp_rsp_info_ptr = 93 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 94 95 return fcp_rsp_info_ptr; 96 } 97 98 /* Find start of Sense Information in FCP response unit*/ 99 char * 100 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) 101 { 102 char *fcp_sns_info_ptr; 103 104 fcp_sns_info_ptr = 105 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); 106 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) 107 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + 108 fcp_rsp_iu->fcp_rsp_len; 109 110 return fcp_sns_info_ptr; 111 } 112 113 fcp_dl_t * 114 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) 115 { 116 int additional_length = fcp_cmd->add_fcp_cdb_length << 2; 117 fcp_dl_t *fcp_dl_addr; 118 119 fcp_dl_addr = (fcp_dl_t *) 120 ((unsigned char *) fcp_cmd + 121 sizeof (struct fcp_cmnd_iu) + additional_length); 122 /* 123 * fcp_dl_addr = start address of fcp_cmnd structure + 124 * size of fixed part + size of dynamically sized add_dcp_cdb field 125 * SEE FCP-2 documentation 126 */ 127 return fcp_dl_addr; 128 } 129 130 fcp_dl_t 131 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) 132 { 133 return *zfcp_get_fcp_dl_ptr(fcp_cmd); 134 } 135 136 void 137 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) 138 { 139 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; 140 } 141 142 /* 143 * note: it's a bit-or operation not an assignment 144 * regarding the specified byte 145 */ 146 static inline void 147 set_byte(u32 * result, char status, char pos) 148 { 149 *result |= status << (pos * 8); 150 } 151 152 void 153 set_host_byte(u32 * result, char status) 154 { 155 set_byte(result, status, 2); 156 } 157 158 void 159 set_driver_byte(u32 * result, char status) 160 { 161 set_byte(result, status, 3); 162 } 163 164 /* 165 * function: zfcp_scsi_slave_alloc 166 * 167 * purpose: 168 * 169 * returns: 170 */ 171 172 static int 173 zfcp_scsi_slave_alloc(struct scsi_device *sdp) 174 { 175 struct zfcp_adapter *adapter; 176 struct zfcp_unit *unit; 177 unsigned long flags; 178 int retval = -ENXIO; 179 180 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; 181 if (!adapter) 182 goto out; 183 184 read_lock_irqsave(&zfcp_data.config_lock, flags); 185 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); 186 if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED, 187 &unit->status)) { 188 sdp->hostdata = unit; 189 unit->device = sdp; 190 zfcp_unit_get(unit); 191 retval = 0; 192 } 193 read_unlock_irqrestore(&zfcp_data.config_lock, flags); 194 out: 195 return retval; 196 } 197 198 /* 199 * function: zfcp_scsi_slave_destroy 200 * 201 * purpose: 202 * 203 * returns: 204 */ 205 206 static void 207 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) 208 { 209 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; 210 211 if (unit) { 212 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status); 213 sdpnt->hostdata = NULL; 214 unit->device = NULL; 215 zfcp_unit_put(unit); 216 } else { 217 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " 218 "address %p\n", sdpnt); 219 } 220 } 221 222 /* 223 * called from scsi midlayer to allow finetuning of a device. 224 */ 225 static int 226 zfcp_scsi_slave_configure(struct scsi_device *sdp) 227 { 228 if (sdp->tagged_supported) 229 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); 230 else 231 scsi_adjust_queue_depth(sdp, 0, 1); 232 return 0; 233 } 234 235 /** 236 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function 237 * @scpnt: pointer to struct scsi_cmnd where result is set 238 * @result: result to be set in scpnt (e.g. DID_ERROR) 239 */ 240 static void 241 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 242 { 243 set_host_byte(&scpnt->result, result); 244 if ((scpnt->device != NULL) && (scpnt->device->host != NULL)) 245 zfcp_scsi_dbf_event_result("fail", 4, 246 (struct zfcp_adapter*) scpnt->device->host->hostdata[0], 247 scpnt, NULL); 248 /* return directly */ 249 scpnt->scsi_done(scpnt); 250 } 251 252 /** 253 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and 254 * zfcp_scsi_command_sync 255 * @adapter: adapter where scsi command is issued 256 * @unit: unit to which scsi command is sent 257 * @scpnt: scsi command to be sent 258 * @timer: timer to be started if request is successfully initiated 259 * 260 * Note: In scsi_done function must be set in scpnt. 261 */ 262 int 263 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, 264 struct scsi_cmnd *scpnt, struct timer_list *timer) 265 { 266 int tmp; 267 int retval; 268 269 retval = 0; 270 271 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); 272 BUG_ON(scpnt->scsi_done == NULL); 273 274 if (unlikely(NULL == unit)) { 275 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 276 goto out; 277 } 278 279 if (unlikely( 280 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || 281 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { 282 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " 283 "0x%016Lx on adapter %s\n", 284 unit->fcp_lun, unit->port->wwpn, 285 zfcp_get_busid_by_adapter(adapter)); 286 zfcp_scsi_command_fail(scpnt, DID_ERROR); 287 goto out; 288 } 289 290 if (unlikely( 291 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { 292 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " 293 "on port 0x%016Lx in recovery\n", 294 zfcp_get_busid_by_unit(unit), 295 unit->fcp_lun, unit->port->wwpn); 296 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); 297 goto out; 298 } 299 300 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer, 301 ZFCP_REQ_AUTO_CLEANUP); 302 303 if (unlikely(tmp < 0)) { 304 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); 305 retval = SCSI_MLQUEUE_HOST_BUSY; 306 } 307 308 out: 309 return retval; 310 } 311 312 void 313 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) 314 { 315 struct completion *wait = (struct completion *) scpnt->SCp.ptr; 316 complete(wait); 317 } 318 319 320 /** 321 * zfcp_scsi_command_sync - send a SCSI command and wait for completion 322 * @unit: unit where command is sent to 323 * @scpnt: scsi command to be sent 324 * @timer: timer to be started if request is successfully initiated 325 * Return: 0 326 * 327 * Errors are indicated in scpnt->result 328 */ 329 int 330 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, 331 struct timer_list *timer) 332 { 333 int ret; 334 DECLARE_COMPLETION(wait); 335 336 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ 337 scpnt->scsi_done = zfcp_scsi_command_sync_handler; 338 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer); 339 if (ret == 0) 340 wait_for_completion(&wait); 341 342 scpnt->SCp.ptr = NULL; 343 344 return 0; 345 } 346 347 /* 348 * function: zfcp_scsi_queuecommand 349 * 350 * purpose: enqueues a SCSI command to the specified target device 351 * 352 * returns: 0 - success, SCSI command enqueued 353 * !0 - failure 354 */ 355 int 356 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, 357 void (*done) (struct scsi_cmnd *)) 358 { 359 struct zfcp_unit *unit; 360 struct zfcp_adapter *adapter; 361 362 /* reset the status for this request */ 363 scpnt->result = 0; 364 scpnt->host_scribble = NULL; 365 scpnt->scsi_done = done; 366 367 /* 368 * figure out adapter and target device 369 * (stored there by zfcp_scsi_slave_alloc) 370 */ 371 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; 372 unit = (struct zfcp_unit *) scpnt->device->hostdata; 373 374 return zfcp_scsi_command_async(adapter, unit, scpnt, NULL); 375 } 376 377 /* 378 * function: zfcp_unit_lookup 379 * 380 * purpose: 381 * 382 * returns: 383 * 384 * context: 385 */ 386 static struct zfcp_unit * 387 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id, 388 scsi_lun_t lun) 389 { 390 struct zfcp_port *port; 391 struct zfcp_unit *unit, *retval = NULL; 392 393 list_for_each_entry(port, &adapter->port_list_head, list) { 394 if (!port->rport || (id != port->rport->scsi_target_id)) 395 continue; 396 list_for_each_entry(unit, &port->unit_list_head, list) { 397 if (lun == unit->scsi_lun) { 398 retval = unit; 399 goto out; 400 } 401 } 402 } 403 out: 404 return retval; 405 } 406 407 /** 408 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command 409 * @scpnt: pointer to scsi_cmnd to be aborted 410 * Return: SUCCESS - command has been aborted and cleaned up in internal 411 * bookkeeping, SCSI stack won't be called for aborted command 412 * FAILED - otherwise 413 * 414 * We do not need to care for a SCSI command which completes normally 415 * but late during this abort routine runs. We are allowed to return 416 * late commands to the SCSI stack. It tracks the state of commands and 417 * will handle late commands. (Usually, the normal completion of late 418 * commands is ignored with respect to the running abort operation.) 419 */ 420 int 421 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 422 { 423 struct Scsi_Host *scsi_host; 424 struct zfcp_adapter *adapter; 425 struct zfcp_unit *unit; 426 int retval = SUCCESS; 427 struct zfcp_fsf_req *new_fsf_req = NULL; 428 struct zfcp_fsf_req *old_fsf_req; 429 unsigned long flags; 430 431 scsi_host = scpnt->device->host; 432 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; 433 unit = (struct zfcp_unit *) scpnt->device->hostdata; 434 435 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", 436 scpnt, zfcp_get_busid_by_adapter(adapter)); 437 438 /* avoid race condition between late normal completion and abort */ 439 write_lock_irqsave(&adapter->abort_lock, flags); 440 441 /* 442 * Check whether command has just completed and can not be aborted. 443 * Even if the command has just been completed late, we can access 444 * scpnt since the SCSI stack does not release it at least until 445 * this routine returns. (scpnt is parameter passed to this routine 446 * and must not disappear during abort even on late completion.) 447 */ 448 old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble; 449 if (!old_fsf_req) { 450 write_unlock_irqrestore(&adapter->abort_lock, flags); 451 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, NULL); 452 retval = SUCCESS; 453 goto out; 454 } 455 old_fsf_req->data = 0; 456 old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; 457 458 /* don't access old_fsf_req after releasing the abort_lock */ 459 write_unlock_irqrestore(&adapter->abort_lock, flags); 460 /* call FSF routine which does the abort */ 461 new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req, 462 adapter, unit, 0); 463 if (!new_fsf_req) { 464 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n"); 465 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL, 466 old_fsf_req); 467 retval = FAILED; 468 goto out; 469 } 470 471 /* wait for completion of abort */ 472 __wait_event(new_fsf_req->completion_wq, 473 new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 474 475 /* status should be valid since signals were not permitted */ 476 if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { 477 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req, 478 NULL); 479 retval = SUCCESS; 480 } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { 481 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req, 482 NULL); 483 retval = SUCCESS; 484 } else { 485 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req, 486 NULL); 487 retval = FAILED; 488 } 489 zfcp_fsf_req_free(new_fsf_req); 490 out: 491 return retval; 492 } 493 494 /* 495 * function: zfcp_scsi_eh_device_reset_handler 496 * 497 * purpose: 498 * 499 * returns: 500 */ 501 int 502 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 503 { 504 int retval; 505 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; 506 507 if (!unit) { 508 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); 509 retval = SUCCESS; 510 goto out; 511 } 512 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); 513 514 /* 515 * If we do not know whether the unit supports 'logical unit reset' 516 * then try 'logical unit reset' and proceed with 'target reset' 517 * if 'logical unit reset' fails. 518 * If the unit is known not to support 'logical unit reset' then 519 * skip 'logical unit reset' and try 'target reset' immediately. 520 */ 521 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 522 &unit->status)) { 523 retval = zfcp_task_management_function(unit, 524 FCP_LOGICAL_UNIT_RESET, 525 scpnt); 526 if (retval) { 527 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); 528 if (retval == -ENOTSUPP) 529 atomic_set_mask 530 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, 531 &unit->status); 532 /* fall through and try 'target reset' next */ 533 } else { 534 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", 535 unit); 536 /* avoid 'target reset' */ 537 retval = SUCCESS; 538 goto out; 539 } 540 } 541 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt); 542 if (retval) { 543 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); 544 retval = FAILED; 545 } else { 546 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); 547 retval = SUCCESS; 548 } 549 out: 550 return retval; 551 } 552 553 static int 554 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags, 555 struct scsi_cmnd *scpnt) 556 { 557 struct zfcp_adapter *adapter = unit->port->adapter; 558 struct zfcp_fsf_req *fsf_req; 559 int retval = 0; 560 561 /* issue task management function */ 562 fsf_req = zfcp_fsf_send_fcp_command_task_management 563 (adapter, unit, tm_flags, 0); 564 if (!fsf_req) { 565 ZFCP_LOG_INFO("error: creation of task management request " 566 "failed for unit 0x%016Lx on port 0x%016Lx on " 567 "adapter %s\n", unit->fcp_lun, unit->port->wwpn, 568 zfcp_get_busid_by_adapter(adapter)); 569 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt); 570 retval = -ENOMEM; 571 goto out; 572 } 573 574 __wait_event(fsf_req->completion_wq, 575 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); 576 577 /* 578 * check completion status of task management function 579 */ 580 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 581 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt); 582 retval = -EIO; 583 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) { 584 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt); 585 retval = -ENOTSUPP; 586 } else 587 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt); 588 589 zfcp_fsf_req_free(fsf_req); 590 out: 591 return retval; 592 } 593 594 /** 595 * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter) 596 */ 597 int 598 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt) 599 { 600 struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata; 601 struct zfcp_adapter *adapter = unit->port->adapter; 602 603 ZFCP_LOG_NORMAL("bus reset because of problems with " 604 "unit 0x%016Lx\n", unit->fcp_lun); 605 zfcp_erp_adapter_reopen(adapter, 0); 606 zfcp_erp_wait(adapter); 607 608 return SUCCESS; 609 } 610 611 /** 612 * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter) 613 */ 614 int 615 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 616 { 617 struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata; 618 struct zfcp_adapter *adapter = unit->port->adapter; 619 620 ZFCP_LOG_NORMAL("host reset because of problems with " 621 "unit 0x%016Lx\n", unit->fcp_lun); 622 zfcp_erp_adapter_reopen(adapter, 0); 623 zfcp_erp_wait(adapter); 624 625 return SUCCESS; 626 } 627 628 /* 629 * function: 630 * 631 * purpose: 632 * 633 * returns: 634 */ 635 int 636 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) 637 { 638 int retval = 0; 639 static unsigned int unique_id = 0; 640 641 /* register adapter as SCSI host with mid layer of SCSI stack */ 642 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, 643 sizeof (struct zfcp_adapter *)); 644 if (!adapter->scsi_host) { 645 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " 646 "for adapter %s ", 647 zfcp_get_busid_by_adapter(adapter)); 648 retval = -EIO; 649 goto out; 650 } 651 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); 652 653 /* tell the SCSI stack some characteristics of this adapter */ 654 adapter->scsi_host->max_id = 1; 655 adapter->scsi_host->max_lun = 1; 656 adapter->scsi_host->max_channel = 0; 657 adapter->scsi_host->unique_id = unique_id++; /* FIXME */ 658 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; 659 adapter->scsi_host->transportt = zfcp_transport_template; 660 /* 661 * Reverse mapping of the host number to avoid race condition 662 */ 663 adapter->scsi_host_no = adapter->scsi_host->host_no; 664 665 /* 666 * save a pointer to our own adapter data structure within 667 * hostdata field of SCSI host data structure 668 */ 669 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 670 671 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 672 scsi_host_put(adapter->scsi_host); 673 retval = -EIO; 674 goto out; 675 } 676 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 677 out: 678 return retval; 679 } 680 681 /* 682 * function: 683 * 684 * purpose: 685 * 686 * returns: 687 */ 688 void 689 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) 690 { 691 struct Scsi_Host *shost; 692 struct zfcp_port *port; 693 694 shost = adapter->scsi_host; 695 if (!shost) 696 return; 697 read_lock_irq(&zfcp_data.config_lock); 698 list_for_each_entry(port, &adapter->port_list_head, list) 699 if (port->rport) 700 port->rport = NULL; 701 read_unlock_irq(&zfcp_data.config_lock); 702 fc_remove_host(shost); 703 scsi_remove_host(shost); 704 scsi_host_put(shost); 705 adapter->scsi_host = NULL; 706 adapter->scsi_host_no = 0; 707 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); 708 709 return; 710 } 711 712 713 void 714 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter) 715 { 716 adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler; 717 adapter->scsi_er_timer.data = (unsigned long) adapter; 718 adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT; 719 add_timer(&adapter->scsi_er_timer); 720 } 721 722 /* 723 * Support functions for FC transport class 724 */ 725 static struct fc_host_statistics* 726 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 727 { 728 struct fc_host_statistics *fc_stats; 729 730 if (!adapter->fc_stats) { 731 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 732 if (!fc_stats) 733 return NULL; 734 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */ 735 } 736 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 737 return adapter->fc_stats; 738 } 739 740 static void 741 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 742 struct fsf_qtcb_bottom_port *data, 743 struct fsf_qtcb_bottom_port *old) 744 { 745 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset - 746 old->seconds_since_last_reset; 747 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 748 fc_stats->tx_words = data->tx_words - old->tx_words; 749 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 750 fc_stats->rx_words = data->rx_words - old->rx_words; 751 fc_stats->lip_count = data->lip - old->lip; 752 fc_stats->nos_count = data->nos - old->nos; 753 fc_stats->error_frames = data->error_frames - old->error_frames; 754 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 755 fc_stats->link_failure_count = data->link_failure - old->link_failure; 756 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 757 fc_stats->loss_of_signal_count = data->loss_of_signal - 758 old->loss_of_signal; 759 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts - 760 old->psp_error_counts; 761 fc_stats->invalid_tx_word_count = data->invalid_tx_words - 762 old->invalid_tx_words; 763 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 764 fc_stats->fcp_input_requests = data->input_requests - 765 old->input_requests; 766 fc_stats->fcp_output_requests = data->output_requests - 767 old->output_requests; 768 fc_stats->fcp_control_requests = data->control_requests - 769 old->control_requests; 770 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 771 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 772 } 773 774 static void 775 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 776 struct fsf_qtcb_bottom_port *data) 777 { 778 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 779 fc_stats->tx_frames = data->tx_frames; 780 fc_stats->tx_words = data->tx_words; 781 fc_stats->rx_frames = data->rx_frames; 782 fc_stats->rx_words = data->rx_words; 783 fc_stats->lip_count = data->lip; 784 fc_stats->nos_count = data->nos; 785 fc_stats->error_frames = data->error_frames; 786 fc_stats->dumped_frames = data->dumped_frames; 787 fc_stats->link_failure_count = data->link_failure; 788 fc_stats->loss_of_sync_count = data->loss_of_sync; 789 fc_stats->loss_of_signal_count = data->loss_of_signal; 790 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 791 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 792 fc_stats->invalid_crc_count = data->invalid_crcs; 793 fc_stats->fcp_input_requests = data->input_requests; 794 fc_stats->fcp_output_requests = data->output_requests; 795 fc_stats->fcp_control_requests = data->control_requests; 796 fc_stats->fcp_input_megabytes = data->input_mb; 797 fc_stats->fcp_output_megabytes = data->output_mb; 798 } 799 800 /** 801 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc 802 * 803 * assumption: scsi_transport_fc synchronizes calls of 804 * get_fc_host_stats and reset_fc_host_stats 805 * (XXX to be checked otherwise introduce locking) 806 */ 807 static struct fc_host_statistics * 808 zfcp_get_fc_host_stats(struct Scsi_Host *shost) 809 { 810 struct zfcp_adapter *adapter; 811 struct fc_host_statistics *fc_stats; 812 struct fsf_qtcb_bottom_port *data; 813 int ret; 814 815 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 816 fc_stats = zfcp_init_fc_host_stats(adapter); 817 if (!fc_stats) 818 return NULL; 819 820 data = kmalloc(sizeof(*data), GFP_KERNEL); 821 if (!data) 822 return NULL; 823 memset(data, 0, sizeof(*data)); 824 825 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); 826 if (ret) { 827 kfree(data); 828 return NULL; /* XXX return zeroed fc_stats? */ 829 } 830 831 if (adapter->stats_reset && 832 ((jiffies/HZ - adapter->stats_reset) < 833 data->seconds_since_last_reset)) { 834 zfcp_adjust_fc_host_stats(fc_stats, data, 835 adapter->stats_reset_data); 836 } else 837 zfcp_set_fc_host_stats(fc_stats, data); 838 839 kfree(data); 840 return fc_stats; 841 } 842 843 static void 844 zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 845 { 846 struct zfcp_adapter *adapter; 847 struct fsf_qtcb_bottom_port *data, *old_data; 848 int ret; 849 850 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 851 data = kmalloc(sizeof(*data), GFP_KERNEL); 852 if (!data) 853 return; 854 memset(data, 0, sizeof(*data)); 855 856 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); 857 if (ret == 0) { 858 adapter->stats_reset = jiffies/HZ; 859 old_data = adapter->stats_reset_data; 860 adapter->stats_reset_data = data; /* finally freed in 861 adater_dequeue */ 862 kfree(old_data); 863 } 864 } 865 866 struct fc_function_template zfcp_transport_functions = { 867 .show_starget_port_id = 1, 868 .show_starget_port_name = 1, 869 .show_starget_node_name = 1, 870 .show_rport_supported_classes = 1, 871 .show_host_node_name = 1, 872 .show_host_port_name = 1, 873 .show_host_permanent_port_name = 1, 874 .show_host_supported_classes = 1, 875 .show_host_supported_speeds = 1, 876 .show_host_maxframe_size = 1, 877 .show_host_serial_number = 1, 878 .get_fc_host_stats = zfcp_get_fc_host_stats, 879 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 880 /* no functions registered for following dynamic attributes but 881 directly set by LLDD */ 882 .show_host_port_type = 1, 883 .show_host_speed = 1, 884 .show_host_port_id = 1, 885 }; 886 887 /** 888 * ZFCP_DEFINE_SCSI_ATTR 889 * @_name: name of show attribute 890 * @_format: format string 891 * @_value: value to print 892 * 893 * Generates attribute for a unit. 894 */ 895 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ 896 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ 897 char *buf) \ 898 { \ 899 struct scsi_device *sdev; \ 900 struct zfcp_unit *unit; \ 901 \ 902 sdev = to_scsi_device(dev); \ 903 unit = sdev->hostdata; \ 904 return sprintf(buf, _format, _value); \ 905 } \ 906 \ 907 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); 908 909 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); 910 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); 911 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); 912 913 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { 914 &dev_attr_fcp_lun, 915 &dev_attr_wwpn, 916 &dev_attr_hba_id, 917 NULL 918 }; 919 920 #undef ZFCP_LOG_AREA 921