1 /* 2 * zfcp device driver 3 * 4 * Module interface and handling of zfcp data structures. 5 * 6 * Copyright IBM Corporation 2002, 2010 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 <linux/slab.h> 34 #include "zfcp_ext.h" 35 #include "zfcp_fc.h" 36 #include "zfcp_reqlist.h" 37 38 #define ZFCP_BUS_ID_SIZE 20 39 40 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com"); 41 MODULE_DESCRIPTION("FCP HBA driver"); 42 MODULE_LICENSE("GPL"); 43 44 static char *init_device; 45 module_param_named(device, init_device, charp, 0400); 46 MODULE_PARM_DESC(device, "specify initial device"); 47 48 static struct kmem_cache *zfcp_cache_hw_align(const char *name, 49 unsigned long size) 50 { 51 return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL); 52 } 53 54 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun) 55 { 56 struct ccw_device *cdev; 57 struct zfcp_adapter *adapter; 58 struct zfcp_port *port; 59 struct zfcp_unit *unit; 60 61 cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); 62 if (!cdev) 63 return; 64 65 if (ccw_device_set_online(cdev)) 66 goto out_ccw_device; 67 68 adapter = zfcp_ccw_adapter_by_cdev(cdev); 69 if (!adapter) 70 goto out_ccw_device; 71 72 port = zfcp_get_port_by_wwpn(adapter, wwpn); 73 if (!port) 74 goto out_port; 75 76 flush_work(&port->rport_work); 77 unit = zfcp_unit_enqueue(port, lun); 78 if (IS_ERR(unit)) 79 goto out_unit; 80 81 zfcp_erp_unit_reopen(unit, 0, "auidc_1", NULL); 82 zfcp_erp_wait(adapter); 83 zfcp_scsi_scan(unit); 84 85 out_unit: 86 put_device(&port->dev); 87 out_port: 88 zfcp_ccw_adapter_put(adapter); 89 out_ccw_device: 90 put_device(&cdev->dev); 91 return; 92 } 93 94 static void __init zfcp_init_device_setup(char *devstr) 95 { 96 char *token; 97 char *str, *str_saved; 98 char busid[ZFCP_BUS_ID_SIZE]; 99 u64 wwpn, lun; 100 101 /* duplicate devstr and keep the original for sysfs presentation*/ 102 str_saved = kstrdup(devstr, GFP_KERNEL); 103 str = str_saved; 104 if (!str) 105 return; 106 107 token = strsep(&str, ","); 108 if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE) 109 goto err_out; 110 strncpy(busid, token, ZFCP_BUS_ID_SIZE); 111 112 token = strsep(&str, ","); 113 if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn)) 114 goto err_out; 115 116 token = strsep(&str, ","); 117 if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun)) 118 goto err_out; 119 120 kfree(str_saved); 121 zfcp_init_device_configure(busid, wwpn, lun); 122 return; 123 124 err_out: 125 kfree(str_saved); 126 pr_err("%s is not a valid SCSI device\n", devstr); 127 } 128 129 static int __init zfcp_module_init(void) 130 { 131 int retval = -ENOMEM; 132 133 zfcp_data.gpn_ft_cache = zfcp_cache_hw_align("zfcp_gpn", 134 sizeof(struct zfcp_fc_gpn_ft_req)); 135 if (!zfcp_data.gpn_ft_cache) 136 goto out; 137 138 zfcp_data.qtcb_cache = zfcp_cache_hw_align("zfcp_qtcb", 139 sizeof(struct fsf_qtcb)); 140 if (!zfcp_data.qtcb_cache) 141 goto out_qtcb_cache; 142 143 zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr", 144 sizeof(struct fsf_status_read_buffer)); 145 if (!zfcp_data.sr_buffer_cache) 146 goto out_sr_cache; 147 148 zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid", 149 sizeof(struct zfcp_fc_gid_pn)); 150 if (!zfcp_data.gid_pn_cache) 151 goto out_gid_cache; 152 153 zfcp_data.adisc_cache = zfcp_cache_hw_align("zfcp_adisc", 154 sizeof(struct zfcp_fc_els_adisc)); 155 if (!zfcp_data.adisc_cache) 156 goto out_adisc_cache; 157 158 zfcp_data.scsi_transport_template = 159 fc_attach_transport(&zfcp_transport_functions); 160 if (!zfcp_data.scsi_transport_template) 161 goto out_transport; 162 scsi_transport_reserve_device(zfcp_data.scsi_transport_template, 163 sizeof(struct zfcp_scsi_dev)); 164 165 166 retval = misc_register(&zfcp_cfdc_misc); 167 if (retval) { 168 pr_err("Registering the misc device zfcp_cfdc failed\n"); 169 goto out_misc; 170 } 171 172 retval = ccw_driver_register(&zfcp_ccw_driver); 173 if (retval) { 174 pr_err("The zfcp device driver could not register with " 175 "the common I/O layer\n"); 176 goto out_ccw_register; 177 } 178 179 if (init_device) 180 zfcp_init_device_setup(init_device); 181 return 0; 182 183 out_ccw_register: 184 misc_deregister(&zfcp_cfdc_misc); 185 out_misc: 186 fc_release_transport(zfcp_data.scsi_transport_template); 187 out_transport: 188 kmem_cache_destroy(zfcp_data.adisc_cache); 189 out_adisc_cache: 190 kmem_cache_destroy(zfcp_data.gid_pn_cache); 191 out_gid_cache: 192 kmem_cache_destroy(zfcp_data.sr_buffer_cache); 193 out_sr_cache: 194 kmem_cache_destroy(zfcp_data.qtcb_cache); 195 out_qtcb_cache: 196 kmem_cache_destroy(zfcp_data.gpn_ft_cache); 197 out: 198 return retval; 199 } 200 201 module_init(zfcp_module_init); 202 203 static void __exit zfcp_module_exit(void) 204 { 205 ccw_driver_unregister(&zfcp_ccw_driver); 206 misc_deregister(&zfcp_cfdc_misc); 207 fc_release_transport(zfcp_data.scsi_transport_template); 208 kmem_cache_destroy(zfcp_data.adisc_cache); 209 kmem_cache_destroy(zfcp_data.gid_pn_cache); 210 kmem_cache_destroy(zfcp_data.sr_buffer_cache); 211 kmem_cache_destroy(zfcp_data.qtcb_cache); 212 kmem_cache_destroy(zfcp_data.gpn_ft_cache); 213 } 214 215 module_exit(zfcp_module_exit); 216 217 /** 218 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN 219 * @port: pointer to port to search for unit 220 * @fcp_lun: FCP LUN to search for 221 * 222 * Returns: pointer to zfcp_unit or NULL 223 */ 224 struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun) 225 { 226 unsigned long flags; 227 struct zfcp_unit *unit; 228 229 read_lock_irqsave(&port->unit_list_lock, flags); 230 list_for_each_entry(unit, &port->unit_list, list) 231 if (unit->fcp_lun == fcp_lun) { 232 if (!get_device(&unit->dev)) 233 unit = NULL; 234 read_unlock_irqrestore(&port->unit_list_lock, flags); 235 return unit; 236 } 237 read_unlock_irqrestore(&port->unit_list_lock, flags); 238 return NULL; 239 } 240 241 /** 242 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn 243 * @adapter: pointer to adapter to search for port 244 * @wwpn: wwpn to search for 245 * 246 * Returns: pointer to zfcp_port or NULL 247 */ 248 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, 249 u64 wwpn) 250 { 251 unsigned long flags; 252 struct zfcp_port *port; 253 254 read_lock_irqsave(&adapter->port_list_lock, flags); 255 list_for_each_entry(port, &adapter->port_list, list) 256 if (port->wwpn == wwpn) { 257 if (!get_device(&port->dev)) 258 port = NULL; 259 read_unlock_irqrestore(&adapter->port_list_lock, flags); 260 return port; 261 } 262 read_unlock_irqrestore(&adapter->port_list_lock, flags); 263 return NULL; 264 } 265 266 /** 267 * zfcp_unit_release - dequeue unit 268 * @dev: pointer to device 269 * 270 * waits until all work is done on unit and removes it then from the unit->list 271 * of the associated port. 272 */ 273 static void zfcp_unit_release(struct device *dev) 274 { 275 struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev); 276 277 put_device(&unit->port->dev); 278 kfree(unit); 279 } 280 281 /** 282 * zfcp_unit_enqueue - enqueue unit to unit list of a port. 283 * @port: pointer to port where unit is added 284 * @fcp_lun: FCP LUN of unit to be enqueued 285 * Returns: pointer to enqueued unit on success, ERR_PTR on error 286 * 287 * Sets up some unit internal structures and creates sysfs entry. 288 */ 289 struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun) 290 { 291 struct zfcp_unit *unit; 292 int retval = -ENOMEM; 293 294 get_device(&port->dev); 295 296 unit = zfcp_get_unit_by_lun(port, fcp_lun); 297 if (unit) { 298 put_device(&unit->dev); 299 retval = -EEXIST; 300 goto err_out; 301 } 302 303 unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL); 304 if (!unit) 305 goto err_out; 306 307 unit->port = port; 308 unit->fcp_lun = fcp_lun; 309 unit->dev.parent = &port->dev; 310 unit->dev.release = zfcp_unit_release; 311 312 if (dev_set_name(&unit->dev, "0x%016llx", 313 (unsigned long long) fcp_lun)) { 314 kfree(unit); 315 goto err_out; 316 } 317 retval = -EINVAL; 318 319 INIT_WORK(&unit->scsi_work, zfcp_scsi_scan_work); 320 321 spin_lock_init(&unit->latencies.lock); 322 unit->latencies.write.channel.min = 0xFFFFFFFF; 323 unit->latencies.write.fabric.min = 0xFFFFFFFF; 324 unit->latencies.read.channel.min = 0xFFFFFFFF; 325 unit->latencies.read.fabric.min = 0xFFFFFFFF; 326 unit->latencies.cmd.channel.min = 0xFFFFFFFF; 327 unit->latencies.cmd.fabric.min = 0xFFFFFFFF; 328 329 if (device_register(&unit->dev)) { 330 put_device(&unit->dev); 331 goto err_out; 332 } 333 334 if (sysfs_create_group(&unit->dev.kobj, &zfcp_sysfs_unit_attrs)) 335 goto err_out_put; 336 337 write_lock_irq(&port->unit_list_lock); 338 list_add_tail(&unit->list, &port->unit_list); 339 write_unlock_irq(&port->unit_list_lock); 340 341 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status); 342 343 return unit; 344 345 err_out_put: 346 device_unregister(&unit->dev); 347 err_out: 348 put_device(&port->dev); 349 return ERR_PTR(retval); 350 } 351 352 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter) 353 { 354 adapter->pool.erp_req = 355 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 356 if (!adapter->pool.erp_req) 357 return -ENOMEM; 358 359 adapter->pool.gid_pn_req = 360 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 361 if (!adapter->pool.gid_pn_req) 362 return -ENOMEM; 363 364 adapter->pool.scsi_req = 365 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 366 if (!adapter->pool.scsi_req) 367 return -ENOMEM; 368 369 adapter->pool.scsi_abort = 370 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 371 if (!adapter->pool.scsi_abort) 372 return -ENOMEM; 373 374 adapter->pool.status_read_req = 375 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM, 376 sizeof(struct zfcp_fsf_req)); 377 if (!adapter->pool.status_read_req) 378 return -ENOMEM; 379 380 adapter->pool.qtcb_pool = 381 mempool_create_slab_pool(4, zfcp_data.qtcb_cache); 382 if (!adapter->pool.qtcb_pool) 383 return -ENOMEM; 384 385 adapter->pool.status_read_data = 386 mempool_create_slab_pool(FSF_STATUS_READS_RECOM, 387 zfcp_data.sr_buffer_cache); 388 if (!adapter->pool.status_read_data) 389 return -ENOMEM; 390 391 adapter->pool.gid_pn = 392 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache); 393 if (!adapter->pool.gid_pn) 394 return -ENOMEM; 395 396 return 0; 397 } 398 399 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter) 400 { 401 if (adapter->pool.erp_req) 402 mempool_destroy(adapter->pool.erp_req); 403 if (adapter->pool.scsi_req) 404 mempool_destroy(adapter->pool.scsi_req); 405 if (adapter->pool.scsi_abort) 406 mempool_destroy(adapter->pool.scsi_abort); 407 if (adapter->pool.qtcb_pool) 408 mempool_destroy(adapter->pool.qtcb_pool); 409 if (adapter->pool.status_read_req) 410 mempool_destroy(adapter->pool.status_read_req); 411 if (adapter->pool.status_read_data) 412 mempool_destroy(adapter->pool.status_read_data); 413 if (adapter->pool.gid_pn) 414 mempool_destroy(adapter->pool.gid_pn); 415 } 416 417 /** 418 * zfcp_status_read_refill - refill the long running status_read_requests 419 * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled 420 * 421 * Returns: 0 on success, 1 otherwise 422 * 423 * if there are 16 or more status_read requests missing an adapter_reopen 424 * is triggered 425 */ 426 int zfcp_status_read_refill(struct zfcp_adapter *adapter) 427 { 428 while (atomic_read(&adapter->stat_miss) > 0) 429 if (zfcp_fsf_status_read(adapter->qdio)) { 430 if (atomic_read(&adapter->stat_miss) >= 431 adapter->stat_read_buf_num) { 432 zfcp_erp_adapter_reopen(adapter, 0, "axsref1", 433 NULL); 434 return 1; 435 } 436 break; 437 } else 438 atomic_dec(&adapter->stat_miss); 439 return 0; 440 } 441 442 static void _zfcp_status_read_scheduler(struct work_struct *work) 443 { 444 zfcp_status_read_refill(container_of(work, struct zfcp_adapter, 445 stat_work)); 446 } 447 448 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl) 449 { 450 struct zfcp_adapter *adapter = 451 container_of(sl, struct zfcp_adapter, service_level); 452 453 seq_printf(m, "zfcp: %s microcode level %x\n", 454 dev_name(&adapter->ccw_device->dev), 455 adapter->fsf_lic_version); 456 } 457 458 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter) 459 { 460 char name[TASK_COMM_LEN]; 461 462 snprintf(name, sizeof(name), "zfcp_q_%s", 463 dev_name(&adapter->ccw_device->dev)); 464 adapter->work_queue = create_singlethread_workqueue(name); 465 466 if (adapter->work_queue) 467 return 0; 468 return -ENOMEM; 469 } 470 471 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter) 472 { 473 if (adapter->work_queue) 474 destroy_workqueue(adapter->work_queue); 475 adapter->work_queue = NULL; 476 477 } 478 479 /** 480 * zfcp_adapter_enqueue - enqueue a new adapter to the list 481 * @ccw_device: pointer to the struct cc_device 482 * 483 * Returns: struct zfcp_adapter* 484 * Enqueues an adapter at the end of the adapter list in the driver data. 485 * All adapter internal structures are set up. 486 * Proc-fs entries are also created. 487 */ 488 struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device) 489 { 490 struct zfcp_adapter *adapter; 491 492 if (!get_device(&ccw_device->dev)) 493 return ERR_PTR(-ENODEV); 494 495 adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL); 496 if (!adapter) { 497 put_device(&ccw_device->dev); 498 return ERR_PTR(-ENOMEM); 499 } 500 501 kref_init(&adapter->ref); 502 503 ccw_device->handler = NULL; 504 adapter->ccw_device = ccw_device; 505 506 INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler); 507 INIT_WORK(&adapter->scan_work, zfcp_fc_scan_ports); 508 509 if (zfcp_qdio_setup(adapter)) 510 goto failed; 511 512 if (zfcp_allocate_low_mem_buffers(adapter)) 513 goto failed; 514 515 adapter->req_list = zfcp_reqlist_alloc(); 516 if (!adapter->req_list) 517 goto failed; 518 519 if (zfcp_dbf_adapter_register(adapter)) 520 goto failed; 521 522 if (zfcp_setup_adapter_work_queue(adapter)) 523 goto failed; 524 525 if (zfcp_fc_gs_setup(adapter)) 526 goto failed; 527 528 rwlock_init(&adapter->port_list_lock); 529 INIT_LIST_HEAD(&adapter->port_list); 530 531 INIT_LIST_HEAD(&adapter->events.list); 532 INIT_WORK(&adapter->events.work, zfcp_fc_post_event); 533 spin_lock_init(&adapter->events.list_lock); 534 535 init_waitqueue_head(&adapter->erp_ready_wq); 536 init_waitqueue_head(&adapter->erp_done_wqh); 537 538 INIT_LIST_HEAD(&adapter->erp_ready_head); 539 INIT_LIST_HEAD(&adapter->erp_running_head); 540 541 rwlock_init(&adapter->erp_lock); 542 rwlock_init(&adapter->abort_lock); 543 544 if (zfcp_erp_thread_setup(adapter)) 545 goto failed; 546 547 adapter->service_level.seq_print = zfcp_print_sl; 548 549 dev_set_drvdata(&ccw_device->dev, adapter); 550 551 if (sysfs_create_group(&ccw_device->dev.kobj, 552 &zfcp_sysfs_adapter_attrs)) 553 goto failed; 554 555 /* report size limit per scatter-gather segment */ 556 adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN; 557 adapter->ccw_device->dev.dma_parms = &adapter->dma_parms; 558 559 if (!zfcp_adapter_scsi_register(adapter)) 560 return adapter; 561 562 failed: 563 zfcp_adapter_unregister(adapter); 564 return ERR_PTR(-ENOMEM); 565 } 566 567 void zfcp_adapter_unregister(struct zfcp_adapter *adapter) 568 { 569 struct ccw_device *cdev = adapter->ccw_device; 570 571 cancel_work_sync(&adapter->scan_work); 572 cancel_work_sync(&adapter->stat_work); 573 zfcp_destroy_adapter_work_queue(adapter); 574 575 zfcp_fc_wka_ports_force_offline(adapter->gs); 576 zfcp_adapter_scsi_unregister(adapter); 577 sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs); 578 579 zfcp_erp_thread_kill(adapter); 580 zfcp_dbf_adapter_unregister(adapter->dbf); 581 zfcp_qdio_destroy(adapter->qdio); 582 583 zfcp_ccw_adapter_put(adapter); /* final put to release */ 584 } 585 586 /** 587 * zfcp_adapter_release - remove the adapter from the resource list 588 * @ref: pointer to struct kref 589 * locks: adapter list write lock is assumed to be held by caller 590 */ 591 void zfcp_adapter_release(struct kref *ref) 592 { 593 struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter, 594 ref); 595 struct ccw_device *cdev = adapter->ccw_device; 596 597 dev_set_drvdata(&adapter->ccw_device->dev, NULL); 598 zfcp_fc_gs_destroy(adapter); 599 zfcp_free_low_mem_buffers(adapter); 600 kfree(adapter->req_list); 601 kfree(adapter->fc_stats); 602 kfree(adapter->stats_reset_data); 603 kfree(adapter); 604 put_device(&cdev->dev); 605 } 606 607 /** 608 * zfcp_device_unregister - remove port, unit from system 609 * @dev: reference to device which is to be removed 610 * @grp: related reference to attribute group 611 * 612 * Helper function to unregister port, unit from system 613 */ 614 void zfcp_device_unregister(struct device *dev, 615 const struct attribute_group *grp) 616 { 617 sysfs_remove_group(&dev->kobj, grp); 618 device_unregister(dev); 619 } 620 621 static void zfcp_port_release(struct device *dev) 622 { 623 struct zfcp_port *port = container_of(dev, struct zfcp_port, dev); 624 625 zfcp_ccw_adapter_put(port->adapter); 626 kfree(port); 627 } 628 629 /** 630 * zfcp_port_enqueue - enqueue port to port list of adapter 631 * @adapter: adapter where remote port is added 632 * @wwpn: WWPN of the remote port to be enqueued 633 * @status: initial status for the port 634 * @d_id: destination id of the remote port to be enqueued 635 * Returns: pointer to enqueued port on success, ERR_PTR on error 636 * 637 * All port internal structures are set up and the sysfs entry is generated. 638 * d_id is used to enqueue ports with a well known address like the Directory 639 * Service for nameserver lookup. 640 */ 641 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn, 642 u32 status, u32 d_id) 643 { 644 struct zfcp_port *port; 645 int retval = -ENOMEM; 646 647 kref_get(&adapter->ref); 648 649 port = zfcp_get_port_by_wwpn(adapter, wwpn); 650 if (port) { 651 put_device(&port->dev); 652 retval = -EEXIST; 653 goto err_out; 654 } 655 656 port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL); 657 if (!port) 658 goto err_out; 659 660 rwlock_init(&port->unit_list_lock); 661 INIT_LIST_HEAD(&port->unit_list); 662 663 INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup); 664 INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work); 665 INIT_WORK(&port->rport_work, zfcp_scsi_rport_work); 666 667 port->adapter = adapter; 668 port->d_id = d_id; 669 port->wwpn = wwpn; 670 port->rport_task = RPORT_NONE; 671 port->dev.parent = &adapter->ccw_device->dev; 672 port->dev.release = zfcp_port_release; 673 674 if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) { 675 kfree(port); 676 goto err_out; 677 } 678 retval = -EINVAL; 679 680 if (device_register(&port->dev)) { 681 put_device(&port->dev); 682 goto err_out; 683 } 684 685 if (sysfs_create_group(&port->dev.kobj, 686 &zfcp_sysfs_port_attrs)) 687 goto err_out_put; 688 689 write_lock_irq(&adapter->port_list_lock); 690 list_add_tail(&port->list, &adapter->port_list); 691 write_unlock_irq(&adapter->port_list_lock); 692 693 atomic_set_mask(status | ZFCP_STATUS_COMMON_RUNNING, &port->status); 694 695 return port; 696 697 err_out_put: 698 device_unregister(&port->dev); 699 err_out: 700 zfcp_ccw_adapter_put(adapter); 701 return ERR_PTR(retval); 702 } 703 704 /** 705 * zfcp_sg_free_table - free memory used by scatterlists 706 * @sg: pointer to scatterlist 707 * @count: number of scatterlist which are to be free'ed 708 * the scatterlist are expected to reference pages always 709 */ 710 void zfcp_sg_free_table(struct scatterlist *sg, int count) 711 { 712 int i; 713 714 for (i = 0; i < count; i++, sg++) 715 if (sg) 716 free_page((unsigned long) sg_virt(sg)); 717 else 718 break; 719 } 720 721 /** 722 * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers 723 * @sg: pointer to struct scatterlist 724 * @count: number of scatterlists which should be assigned with buffers 725 * of size page 726 * 727 * Returns: 0 on success, -ENOMEM otherwise 728 */ 729 int zfcp_sg_setup_table(struct scatterlist *sg, int count) 730 { 731 void *addr; 732 int i; 733 734 sg_init_table(sg, count); 735 for (i = 0; i < count; i++, sg++) { 736 addr = (void *) get_zeroed_page(GFP_KERNEL); 737 if (!addr) { 738 zfcp_sg_free_table(sg, i); 739 return -ENOMEM; 740 } 741 sg_set_buf(sg, addr, PAGE_SIZE); 742 } 743 return 0; 744 } 745