1 /* 2 * zfcp device driver 3 * 4 * Module interface and handling of zfcp data structures. 5 * 6 * Copyright IBM Corporation 2002, 2009 7 */ 8 9 /* 10 * Driver authors: 11 * Martin Peschke (originator of the driver) 12 * Raimund Schroeder 13 * Aron Zeh 14 * Wolfgang Taphorn 15 * Stefan Bader 16 * Heiko Carstens (kernel 2.6 port of the driver) 17 * Andreas Herrmann 18 * Maxim Shchetynin 19 * Volker Sameske 20 * Ralph Wuerthner 21 * Michael Loehr 22 * Swen Schillig 23 * Christof Schmitt 24 * Martin Petermann 25 * Sven Schuetz 26 */ 27 28 #define KMSG_COMPONENT "zfcp" 29 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 30 31 #include <linux/miscdevice.h> 32 #include <linux/seq_file.h> 33 #include "zfcp_ext.h" 34 #include "zfcp_fc.h" 35 36 #define ZFCP_BUS_ID_SIZE 20 37 38 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com"); 39 MODULE_DESCRIPTION("FCP HBA driver"); 40 MODULE_LICENSE("GPL"); 41 42 static char *init_device; 43 module_param_named(device, init_device, charp, 0400); 44 MODULE_PARM_DESC(device, "specify initial device"); 45 46 static struct kmem_cache *zfcp_cache_hw_align(const char *name, 47 unsigned long size) 48 { 49 return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL); 50 } 51 52 static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter) 53 { 54 int idx; 55 56 adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head), 57 GFP_KERNEL); 58 if (!adapter->req_list) 59 return -ENOMEM; 60 61 for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) 62 INIT_LIST_HEAD(&adapter->req_list[idx]); 63 return 0; 64 } 65 66 /** 67 * zfcp_reqlist_isempty - is the request list empty 68 * @adapter: pointer to struct zfcp_adapter 69 * 70 * Returns: true if list is empty, false otherwise 71 */ 72 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter) 73 { 74 unsigned int idx; 75 76 for (idx = 0; idx < REQUEST_LIST_SIZE; idx++) 77 if (!list_empty(&adapter->req_list[idx])) 78 return 0; 79 return 1; 80 } 81 82 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun) 83 { 84 struct ccw_device *cdev; 85 struct zfcp_adapter *adapter; 86 struct zfcp_port *port; 87 struct zfcp_unit *unit; 88 89 cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); 90 if (!cdev) 91 return; 92 93 if (ccw_device_set_online(cdev)) 94 goto out_ccw_device; 95 96 adapter = zfcp_ccw_adapter_by_cdev(cdev); 97 if (!adapter) 98 goto out_ccw_device; 99 100 port = zfcp_get_port_by_wwpn(adapter, wwpn); 101 if (!port) 102 goto out_port; 103 104 unit = zfcp_unit_enqueue(port, lun); 105 if (IS_ERR(unit)) 106 goto out_unit; 107 108 zfcp_erp_unit_reopen(unit, 0, "auidc_1", NULL); 109 zfcp_erp_wait(adapter); 110 flush_work(&unit->scsi_work); 111 112 out_unit: 113 put_device(&port->sysfs_device); 114 out_port: 115 zfcp_ccw_adapter_put(adapter); 116 out_ccw_device: 117 put_device(&cdev->dev); 118 return; 119 } 120 121 static void __init zfcp_init_device_setup(char *devstr) 122 { 123 char *token; 124 char *str, *str_saved; 125 char busid[ZFCP_BUS_ID_SIZE]; 126 u64 wwpn, lun; 127 128 /* duplicate devstr and keep the original for sysfs presentation*/ 129 str_saved = kmalloc(strlen(devstr) + 1, GFP_KERNEL); 130 str = str_saved; 131 if (!str) 132 return; 133 134 strcpy(str, devstr); 135 136 token = strsep(&str, ","); 137 if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE) 138 goto err_out; 139 strncpy(busid, token, ZFCP_BUS_ID_SIZE); 140 141 token = strsep(&str, ","); 142 if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn)) 143 goto err_out; 144 145 token = strsep(&str, ","); 146 if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun)) 147 goto err_out; 148 149 kfree(str_saved); 150 zfcp_init_device_configure(busid, wwpn, lun); 151 return; 152 153 err_out: 154 kfree(str_saved); 155 pr_err("%s is not a valid SCSI device\n", devstr); 156 } 157 158 static int __init zfcp_module_init(void) 159 { 160 int retval = -ENOMEM; 161 162 zfcp_data.gpn_ft_cache = zfcp_cache_hw_align("zfcp_gpn", 163 sizeof(struct zfcp_fc_gpn_ft_req)); 164 if (!zfcp_data.gpn_ft_cache) 165 goto out; 166 167 zfcp_data.qtcb_cache = zfcp_cache_hw_align("zfcp_qtcb", 168 sizeof(struct fsf_qtcb)); 169 if (!zfcp_data.qtcb_cache) 170 goto out_qtcb_cache; 171 172 zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr", 173 sizeof(struct fsf_status_read_buffer)); 174 if (!zfcp_data.sr_buffer_cache) 175 goto out_sr_cache; 176 177 zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid", 178 sizeof(struct zfcp_fc_gid_pn)); 179 if (!zfcp_data.gid_pn_cache) 180 goto out_gid_cache; 181 182 zfcp_data.adisc_cache = zfcp_cache_hw_align("zfcp_adisc", 183 sizeof(struct zfcp_fc_els_adisc)); 184 if (!zfcp_data.adisc_cache) 185 goto out_adisc_cache; 186 187 zfcp_data.scsi_transport_template = 188 fc_attach_transport(&zfcp_transport_functions); 189 if (!zfcp_data.scsi_transport_template) 190 goto out_transport; 191 192 retval = misc_register(&zfcp_cfdc_misc); 193 if (retval) { 194 pr_err("Registering the misc device zfcp_cfdc failed\n"); 195 goto out_misc; 196 } 197 198 retval = ccw_driver_register(&zfcp_ccw_driver); 199 if (retval) { 200 pr_err("The zfcp device driver could not register with " 201 "the common I/O layer\n"); 202 goto out_ccw_register; 203 } 204 205 if (init_device) 206 zfcp_init_device_setup(init_device); 207 return 0; 208 209 out_ccw_register: 210 misc_deregister(&zfcp_cfdc_misc); 211 out_misc: 212 fc_release_transport(zfcp_data.scsi_transport_template); 213 out_transport: 214 kmem_cache_destroy(zfcp_data.adisc_cache); 215 out_adisc_cache: 216 kmem_cache_destroy(zfcp_data.gid_pn_cache); 217 out_gid_cache: 218 kmem_cache_destroy(zfcp_data.sr_buffer_cache); 219 out_sr_cache: 220 kmem_cache_destroy(zfcp_data.qtcb_cache); 221 out_qtcb_cache: 222 kmem_cache_destroy(zfcp_data.gpn_ft_cache); 223 out: 224 return retval; 225 } 226 227 module_init(zfcp_module_init); 228 229 static void __exit zfcp_module_exit(void) 230 { 231 ccw_driver_unregister(&zfcp_ccw_driver); 232 misc_deregister(&zfcp_cfdc_misc); 233 fc_release_transport(zfcp_data.scsi_transport_template); 234 kmem_cache_destroy(zfcp_data.adisc_cache); 235 kmem_cache_destroy(zfcp_data.gid_pn_cache); 236 kmem_cache_destroy(zfcp_data.sr_buffer_cache); 237 kmem_cache_destroy(zfcp_data.qtcb_cache); 238 kmem_cache_destroy(zfcp_data.gpn_ft_cache); 239 } 240 241 module_exit(zfcp_module_exit); 242 243 /** 244 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN 245 * @port: pointer to port to search for unit 246 * @fcp_lun: FCP LUN to search for 247 * 248 * Returns: pointer to zfcp_unit or NULL 249 */ 250 struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun) 251 { 252 unsigned long flags; 253 struct zfcp_unit *unit; 254 255 read_lock_irqsave(&port->unit_list_lock, flags); 256 list_for_each_entry(unit, &port->unit_list, list) 257 if (unit->fcp_lun == fcp_lun) { 258 if (!get_device(&unit->sysfs_device)) 259 unit = NULL; 260 read_unlock_irqrestore(&port->unit_list_lock, flags); 261 return unit; 262 } 263 read_unlock_irqrestore(&port->unit_list_lock, flags); 264 return NULL; 265 } 266 267 /** 268 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn 269 * @adapter: pointer to adapter to search for port 270 * @wwpn: wwpn to search for 271 * 272 * Returns: pointer to zfcp_port or NULL 273 */ 274 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, 275 u64 wwpn) 276 { 277 unsigned long flags; 278 struct zfcp_port *port; 279 280 read_lock_irqsave(&adapter->port_list_lock, flags); 281 list_for_each_entry(port, &adapter->port_list, list) 282 if (port->wwpn == wwpn) { 283 if (!get_device(&port->sysfs_device)) 284 port = NULL; 285 read_unlock_irqrestore(&adapter->port_list_lock, flags); 286 return port; 287 } 288 read_unlock_irqrestore(&adapter->port_list_lock, flags); 289 return NULL; 290 } 291 292 /** 293 * zfcp_unit_release - dequeue unit 294 * @dev: pointer to device 295 * 296 * waits until all work is done on unit and removes it then from the unit->list 297 * of the associated port. 298 */ 299 static void zfcp_unit_release(struct device *dev) 300 { 301 struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, 302 sysfs_device); 303 304 put_device(&unit->port->sysfs_device); 305 kfree(unit); 306 } 307 308 /** 309 * zfcp_unit_enqueue - enqueue unit to unit list of a port. 310 * @port: pointer to port where unit is added 311 * @fcp_lun: FCP LUN of unit to be enqueued 312 * Returns: pointer to enqueued unit on success, ERR_PTR on error 313 * 314 * Sets up some unit internal structures and creates sysfs entry. 315 */ 316 struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun) 317 { 318 struct zfcp_unit *unit; 319 int retval = -ENOMEM; 320 321 get_device(&port->sysfs_device); 322 323 unit = zfcp_get_unit_by_lun(port, fcp_lun); 324 if (unit) { 325 put_device(&unit->sysfs_device); 326 retval = -EEXIST; 327 goto err_out; 328 } 329 330 unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL); 331 if (!unit) 332 goto err_out; 333 334 unit->port = port; 335 unit->fcp_lun = fcp_lun; 336 unit->sysfs_device.parent = &port->sysfs_device; 337 unit->sysfs_device.release = zfcp_unit_release; 338 339 if (dev_set_name(&unit->sysfs_device, "0x%016llx", 340 (unsigned long long) fcp_lun)) { 341 kfree(unit); 342 goto err_out; 343 } 344 retval = -EINVAL; 345 346 INIT_WORK(&unit->scsi_work, zfcp_scsi_scan); 347 348 spin_lock_init(&unit->latencies.lock); 349 unit->latencies.write.channel.min = 0xFFFFFFFF; 350 unit->latencies.write.fabric.min = 0xFFFFFFFF; 351 unit->latencies.read.channel.min = 0xFFFFFFFF; 352 unit->latencies.read.fabric.min = 0xFFFFFFFF; 353 unit->latencies.cmd.channel.min = 0xFFFFFFFF; 354 unit->latencies.cmd.fabric.min = 0xFFFFFFFF; 355 356 if (device_register(&unit->sysfs_device)) { 357 put_device(&unit->sysfs_device); 358 goto err_out; 359 } 360 361 if (sysfs_create_group(&unit->sysfs_device.kobj, 362 &zfcp_sysfs_unit_attrs)) 363 goto err_out_put; 364 365 write_lock_irq(&port->unit_list_lock); 366 list_add_tail(&unit->list, &port->unit_list); 367 write_unlock_irq(&port->unit_list_lock); 368 369 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status); 370 371 return unit; 372 373 err_out_put: 374 device_unregister(&unit->sysfs_device); 375 err_out: 376 put_device(&port->sysfs_device); 377 return ERR_PTR(retval); 378 } 379 380 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter) 381 { 382 adapter->pool.erp_req = 383 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 384 if (!adapter->pool.erp_req) 385 return -ENOMEM; 386 387 adapter->pool.gid_pn_req = 388 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 389 if (!adapter->pool.gid_pn_req) 390 return -ENOMEM; 391 392 adapter->pool.scsi_req = 393 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 394 if (!adapter->pool.scsi_req) 395 return -ENOMEM; 396 397 adapter->pool.scsi_abort = 398 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 399 if (!adapter->pool.scsi_abort) 400 return -ENOMEM; 401 402 adapter->pool.status_read_req = 403 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM, 404 sizeof(struct zfcp_fsf_req)); 405 if (!adapter->pool.status_read_req) 406 return -ENOMEM; 407 408 adapter->pool.qtcb_pool = 409 mempool_create_slab_pool(4, zfcp_data.qtcb_cache); 410 if (!adapter->pool.qtcb_pool) 411 return -ENOMEM; 412 413 adapter->pool.status_read_data = 414 mempool_create_slab_pool(FSF_STATUS_READS_RECOM, 415 zfcp_data.sr_buffer_cache); 416 if (!adapter->pool.status_read_data) 417 return -ENOMEM; 418 419 adapter->pool.gid_pn = 420 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache); 421 if (!adapter->pool.gid_pn) 422 return -ENOMEM; 423 424 return 0; 425 } 426 427 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter) 428 { 429 if (adapter->pool.erp_req) 430 mempool_destroy(adapter->pool.erp_req); 431 if (adapter->pool.scsi_req) 432 mempool_destroy(adapter->pool.scsi_req); 433 if (adapter->pool.scsi_abort) 434 mempool_destroy(adapter->pool.scsi_abort); 435 if (adapter->pool.qtcb_pool) 436 mempool_destroy(adapter->pool.qtcb_pool); 437 if (adapter->pool.status_read_req) 438 mempool_destroy(adapter->pool.status_read_req); 439 if (adapter->pool.status_read_data) 440 mempool_destroy(adapter->pool.status_read_data); 441 if (adapter->pool.gid_pn) 442 mempool_destroy(adapter->pool.gid_pn); 443 } 444 445 /** 446 * zfcp_status_read_refill - refill the long running status_read_requests 447 * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled 448 * 449 * Returns: 0 on success, 1 otherwise 450 * 451 * if there are 16 or more status_read requests missing an adapter_reopen 452 * is triggered 453 */ 454 int zfcp_status_read_refill(struct zfcp_adapter *adapter) 455 { 456 while (atomic_read(&adapter->stat_miss) > 0) 457 if (zfcp_fsf_status_read(adapter->qdio)) { 458 if (atomic_read(&adapter->stat_miss) >= 16) { 459 zfcp_erp_adapter_reopen(adapter, 0, "axsref1", 460 NULL); 461 return 1; 462 } 463 break; 464 } else 465 atomic_dec(&adapter->stat_miss); 466 return 0; 467 } 468 469 static void _zfcp_status_read_scheduler(struct work_struct *work) 470 { 471 zfcp_status_read_refill(container_of(work, struct zfcp_adapter, 472 stat_work)); 473 } 474 475 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl) 476 { 477 struct zfcp_adapter *adapter = 478 container_of(sl, struct zfcp_adapter, service_level); 479 480 seq_printf(m, "zfcp: %s microcode level %x\n", 481 dev_name(&adapter->ccw_device->dev), 482 adapter->fsf_lic_version); 483 } 484 485 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter) 486 { 487 char name[TASK_COMM_LEN]; 488 489 snprintf(name, sizeof(name), "zfcp_q_%s", 490 dev_name(&adapter->ccw_device->dev)); 491 adapter->work_queue = create_singlethread_workqueue(name); 492 493 if (adapter->work_queue) 494 return 0; 495 return -ENOMEM; 496 } 497 498 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter) 499 { 500 if (adapter->work_queue) 501 destroy_workqueue(adapter->work_queue); 502 adapter->work_queue = NULL; 503 504 } 505 506 /** 507 * zfcp_adapter_enqueue - enqueue a new adapter to the list 508 * @ccw_device: pointer to the struct cc_device 509 * 510 * Returns: struct zfcp_adapter* 511 * Enqueues an adapter at the end of the adapter list in the driver data. 512 * All adapter internal structures are set up. 513 * Proc-fs entries are also created. 514 */ 515 struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device) 516 { 517 struct zfcp_adapter *adapter; 518 519 if (!get_device(&ccw_device->dev)) 520 return ERR_PTR(-ENODEV); 521 522 adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL); 523 if (!adapter) { 524 put_device(&ccw_device->dev); 525 return ERR_PTR(-ENOMEM); 526 } 527 528 kref_init(&adapter->ref); 529 530 ccw_device->handler = NULL; 531 adapter->ccw_device = ccw_device; 532 533 INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler); 534 INIT_WORK(&adapter->scan_work, zfcp_fc_scan_ports); 535 536 if (zfcp_qdio_setup(adapter)) 537 goto failed; 538 539 if (zfcp_allocate_low_mem_buffers(adapter)) 540 goto failed; 541 542 if (zfcp_reqlist_alloc(adapter)) 543 goto failed; 544 545 if (zfcp_dbf_adapter_register(adapter)) 546 goto failed; 547 548 if (zfcp_setup_adapter_work_queue(adapter)) 549 goto failed; 550 551 if (zfcp_fc_gs_setup(adapter)) 552 goto failed; 553 554 rwlock_init(&adapter->port_list_lock); 555 INIT_LIST_HEAD(&adapter->port_list); 556 557 init_waitqueue_head(&adapter->erp_ready_wq); 558 init_waitqueue_head(&adapter->erp_done_wqh); 559 560 INIT_LIST_HEAD(&adapter->erp_ready_head); 561 INIT_LIST_HEAD(&adapter->erp_running_head); 562 563 spin_lock_init(&adapter->req_list_lock); 564 565 rwlock_init(&adapter->erp_lock); 566 rwlock_init(&adapter->abort_lock); 567 568 if (zfcp_erp_thread_setup(adapter)) 569 goto failed; 570 571 adapter->service_level.seq_print = zfcp_print_sl; 572 573 dev_set_drvdata(&ccw_device->dev, adapter); 574 575 if (sysfs_create_group(&ccw_device->dev.kobj, 576 &zfcp_sysfs_adapter_attrs)) 577 goto failed; 578 579 if (!zfcp_adapter_scsi_register(adapter)) 580 return adapter; 581 582 failed: 583 zfcp_adapter_unregister(adapter); 584 return ERR_PTR(-ENOMEM); 585 } 586 587 void zfcp_adapter_unregister(struct zfcp_adapter *adapter) 588 { 589 struct ccw_device *cdev = adapter->ccw_device; 590 591 cancel_work_sync(&adapter->scan_work); 592 cancel_work_sync(&adapter->stat_work); 593 zfcp_destroy_adapter_work_queue(adapter); 594 595 zfcp_fc_wka_ports_force_offline(adapter->gs); 596 zfcp_adapter_scsi_unregister(adapter); 597 sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs); 598 599 zfcp_erp_thread_kill(adapter); 600 zfcp_dbf_adapter_unregister(adapter->dbf); 601 zfcp_qdio_destroy(adapter->qdio); 602 603 zfcp_ccw_adapter_put(adapter); /* final put to release */ 604 } 605 606 /** 607 * zfcp_adapter_release - remove the adapter from the resource list 608 * @ref: pointer to struct kref 609 * locks: adapter list write lock is assumed to be held by caller 610 */ 611 void zfcp_adapter_release(struct kref *ref) 612 { 613 struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter, 614 ref); 615 struct ccw_device *cdev = adapter->ccw_device; 616 617 dev_set_drvdata(&adapter->ccw_device->dev, NULL); 618 zfcp_fc_gs_destroy(adapter); 619 zfcp_free_low_mem_buffers(adapter); 620 kfree(adapter->req_list); 621 kfree(adapter->fc_stats); 622 kfree(adapter->stats_reset_data); 623 kfree(adapter); 624 put_device(&cdev->dev); 625 } 626 627 /** 628 * zfcp_device_unregister - remove port, unit from system 629 * @dev: reference to device which is to be removed 630 * @grp: related reference to attribute group 631 * 632 * Helper function to unregister port, unit from system 633 */ 634 void zfcp_device_unregister(struct device *dev, 635 const struct attribute_group *grp) 636 { 637 sysfs_remove_group(&dev->kobj, grp); 638 device_unregister(dev); 639 } 640 641 static void zfcp_port_release(struct device *dev) 642 { 643 struct zfcp_port *port = container_of(dev, struct zfcp_port, 644 sysfs_device); 645 646 zfcp_ccw_adapter_put(port->adapter); 647 kfree(port); 648 } 649 650 /** 651 * zfcp_port_enqueue - enqueue port to port list of adapter 652 * @adapter: adapter where remote port is added 653 * @wwpn: WWPN of the remote port to be enqueued 654 * @status: initial status for the port 655 * @d_id: destination id of the remote port to be enqueued 656 * Returns: pointer to enqueued port on success, ERR_PTR on error 657 * 658 * All port internal structures are set up and the sysfs entry is generated. 659 * d_id is used to enqueue ports with a well known address like the Directory 660 * Service for nameserver lookup. 661 */ 662 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn, 663 u32 status, u32 d_id) 664 { 665 struct zfcp_port *port; 666 int retval = -ENOMEM; 667 668 kref_get(&adapter->ref); 669 670 port = zfcp_get_port_by_wwpn(adapter, wwpn); 671 if (port) { 672 put_device(&port->sysfs_device); 673 retval = -EEXIST; 674 goto err_out; 675 } 676 677 port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL); 678 if (!port) 679 goto err_out; 680 681 rwlock_init(&port->unit_list_lock); 682 INIT_LIST_HEAD(&port->unit_list); 683 684 INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup); 685 INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work); 686 INIT_WORK(&port->rport_work, zfcp_scsi_rport_work); 687 688 port->adapter = adapter; 689 port->d_id = d_id; 690 port->wwpn = wwpn; 691 port->rport_task = RPORT_NONE; 692 port->sysfs_device.parent = &adapter->ccw_device->dev; 693 port->sysfs_device.release = zfcp_port_release; 694 695 if (dev_set_name(&port->sysfs_device, "0x%016llx", 696 (unsigned long long)wwpn)) { 697 kfree(port); 698 goto err_out; 699 } 700 retval = -EINVAL; 701 702 if (device_register(&port->sysfs_device)) { 703 put_device(&port->sysfs_device); 704 goto err_out; 705 } 706 707 if (sysfs_create_group(&port->sysfs_device.kobj, 708 &zfcp_sysfs_port_attrs)) 709 goto err_out_put; 710 711 write_lock_irq(&adapter->port_list_lock); 712 list_add_tail(&port->list, &adapter->port_list); 713 write_unlock_irq(&adapter->port_list_lock); 714 715 atomic_set_mask(status | ZFCP_STATUS_COMMON_RUNNING, &port->status); 716 717 return port; 718 719 err_out_put: 720 device_unregister(&port->sysfs_device); 721 err_out: 722 zfcp_ccw_adapter_put(adapter); 723 return ERR_PTR(retval); 724 } 725 726 /** 727 * zfcp_sg_free_table - free memory used by scatterlists 728 * @sg: pointer to scatterlist 729 * @count: number of scatterlist which are to be free'ed 730 * the scatterlist are expected to reference pages always 731 */ 732 void zfcp_sg_free_table(struct scatterlist *sg, int count) 733 { 734 int i; 735 736 for (i = 0; i < count; i++, sg++) 737 if (sg) 738 free_page((unsigned long) sg_virt(sg)); 739 else 740 break; 741 } 742 743 /** 744 * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers 745 * @sg: pointer to struct scatterlist 746 * @count: number of scatterlists which should be assigned with buffers 747 * of size page 748 * 749 * Returns: 0 on success, -ENOMEM otherwise 750 */ 751 int zfcp_sg_setup_table(struct scatterlist *sg, int count) 752 { 753 void *addr; 754 int i; 755 756 sg_init_table(sg, count); 757 for (i = 0; i < count; i++, sg++) { 758 addr = (void *) get_zeroed_page(GFP_KERNEL); 759 if (!addr) { 760 zfcp_sg_free_table(sg, i); 761 return -ENOMEM; 762 } 763 sg_set_buf(sg, addr, PAGE_SIZE); 764 } 765 return 0; 766 } 767