1 /* 2 * zfcp device driver 3 * 4 * Module interface and handling of zfcp data structures. 5 * 6 * Copyright IBM Corp. 2002, 2013 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 * Steffen Maier 27 */ 28 29 #define KMSG_COMPONENT "zfcp" 30 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 31 32 #include <linux/miscdevice.h> 33 #include <linux/seq_file.h> 34 #include <linux/slab.h> 35 #include <linux/module.h> 36 #include "zfcp_ext.h" 37 #include "zfcp_fc.h" 38 #include "zfcp_reqlist.h" 39 40 #define ZFCP_BUS_ID_SIZE 20 41 42 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com"); 43 MODULE_DESCRIPTION("FCP HBA driver"); 44 MODULE_LICENSE("GPL"); 45 46 static char *init_device; 47 module_param_named(device, init_device, charp, 0400); 48 MODULE_PARM_DESC(device, "specify initial device"); 49 50 static struct kmem_cache * __init zfcp_cache_hw_align(const char *name, 51 unsigned long size) 52 { 53 return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL); 54 } 55 56 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun) 57 { 58 struct ccw_device *cdev; 59 struct zfcp_adapter *adapter; 60 struct zfcp_port *port; 61 62 cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); 63 if (!cdev) 64 return; 65 66 if (ccw_device_set_online(cdev)) 67 goto out_ccw_device; 68 69 adapter = zfcp_ccw_adapter_by_cdev(cdev); 70 if (!adapter) 71 goto out_ccw_device; 72 73 port = zfcp_get_port_by_wwpn(adapter, wwpn); 74 if (!port) 75 goto out_port; 76 flush_work(&port->rport_work); 77 78 zfcp_unit_add(port, lun); 79 put_device(&port->dev); 80 81 out_port: 82 zfcp_ccw_adapter_put(adapter); 83 out_ccw_device: 84 put_device(&cdev->dev); 85 return; 86 } 87 88 static void __init zfcp_init_device_setup(char *devstr) 89 { 90 char *token; 91 char *str, *str_saved; 92 char busid[ZFCP_BUS_ID_SIZE]; 93 u64 wwpn, lun; 94 95 /* duplicate devstr and keep the original for sysfs presentation*/ 96 str_saved = kstrdup(devstr, GFP_KERNEL); 97 str = str_saved; 98 if (!str) 99 return; 100 101 token = strsep(&str, ","); 102 if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE) 103 goto err_out; 104 strncpy(busid, token, ZFCP_BUS_ID_SIZE); 105 106 token = strsep(&str, ","); 107 if (!token || kstrtoull(token, 0, (unsigned long long *) &wwpn)) 108 goto err_out; 109 110 token = strsep(&str, ","); 111 if (!token || kstrtoull(token, 0, (unsigned long long *) &lun)) 112 goto err_out; 113 114 kfree(str_saved); 115 zfcp_init_device_configure(busid, wwpn, lun); 116 return; 117 118 err_out: 119 kfree(str_saved); 120 pr_err("%s is not a valid SCSI device\n", devstr); 121 } 122 123 static int __init zfcp_module_init(void) 124 { 125 int retval = -ENOMEM; 126 127 zfcp_fsf_qtcb_cache = zfcp_cache_hw_align("zfcp_fsf_qtcb", 128 sizeof(struct fsf_qtcb)); 129 if (!zfcp_fsf_qtcb_cache) 130 goto out_qtcb_cache; 131 132 zfcp_fc_req_cache = zfcp_cache_hw_align("zfcp_fc_req", 133 sizeof(struct zfcp_fc_req)); 134 if (!zfcp_fc_req_cache) 135 goto out_fc_cache; 136 137 zfcp_scsi_transport_template = 138 fc_attach_transport(&zfcp_transport_functions); 139 if (!zfcp_scsi_transport_template) 140 goto out_transport; 141 scsi_transport_reserve_device(zfcp_scsi_transport_template, 142 sizeof(struct zfcp_scsi_dev)); 143 144 retval = ccw_driver_register(&zfcp_ccw_driver); 145 if (retval) { 146 pr_err("The zfcp device driver could not register with " 147 "the common I/O layer\n"); 148 goto out_ccw_register; 149 } 150 151 if (init_device) 152 zfcp_init_device_setup(init_device); 153 return 0; 154 155 out_ccw_register: 156 fc_release_transport(zfcp_scsi_transport_template); 157 out_transport: 158 kmem_cache_destroy(zfcp_fc_req_cache); 159 out_fc_cache: 160 kmem_cache_destroy(zfcp_fsf_qtcb_cache); 161 out_qtcb_cache: 162 return retval; 163 } 164 165 module_init(zfcp_module_init); 166 167 static void __exit zfcp_module_exit(void) 168 { 169 ccw_driver_unregister(&zfcp_ccw_driver); 170 fc_release_transport(zfcp_scsi_transport_template); 171 kmem_cache_destroy(zfcp_fc_req_cache); 172 kmem_cache_destroy(zfcp_fsf_qtcb_cache); 173 } 174 175 module_exit(zfcp_module_exit); 176 177 /** 178 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn 179 * @adapter: pointer to adapter to search for port 180 * @wwpn: wwpn to search for 181 * 182 * Returns: pointer to zfcp_port or NULL 183 */ 184 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, 185 u64 wwpn) 186 { 187 unsigned long flags; 188 struct zfcp_port *port; 189 190 read_lock_irqsave(&adapter->port_list_lock, flags); 191 list_for_each_entry(port, &adapter->port_list, list) 192 if (port->wwpn == wwpn) { 193 if (!get_device(&port->dev)) 194 port = NULL; 195 read_unlock_irqrestore(&adapter->port_list_lock, flags); 196 return port; 197 } 198 read_unlock_irqrestore(&adapter->port_list_lock, flags); 199 return NULL; 200 } 201 202 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter) 203 { 204 adapter->pool.erp_req = 205 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 206 if (!adapter->pool.erp_req) 207 return -ENOMEM; 208 209 adapter->pool.gid_pn_req = 210 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 211 if (!adapter->pool.gid_pn_req) 212 return -ENOMEM; 213 214 adapter->pool.scsi_req = 215 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 216 if (!adapter->pool.scsi_req) 217 return -ENOMEM; 218 219 adapter->pool.scsi_abort = 220 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req)); 221 if (!adapter->pool.scsi_abort) 222 return -ENOMEM; 223 224 adapter->pool.status_read_req = 225 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM, 226 sizeof(struct zfcp_fsf_req)); 227 if (!adapter->pool.status_read_req) 228 return -ENOMEM; 229 230 adapter->pool.qtcb_pool = 231 mempool_create_slab_pool(4, zfcp_fsf_qtcb_cache); 232 if (!adapter->pool.qtcb_pool) 233 return -ENOMEM; 234 235 BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE); 236 adapter->pool.sr_data = 237 mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0); 238 if (!adapter->pool.sr_data) 239 return -ENOMEM; 240 241 adapter->pool.gid_pn = 242 mempool_create_slab_pool(1, zfcp_fc_req_cache); 243 if (!adapter->pool.gid_pn) 244 return -ENOMEM; 245 246 return 0; 247 } 248 249 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter) 250 { 251 if (adapter->pool.erp_req) 252 mempool_destroy(adapter->pool.erp_req); 253 if (adapter->pool.scsi_req) 254 mempool_destroy(adapter->pool.scsi_req); 255 if (adapter->pool.scsi_abort) 256 mempool_destroy(adapter->pool.scsi_abort); 257 if (adapter->pool.qtcb_pool) 258 mempool_destroy(adapter->pool.qtcb_pool); 259 if (adapter->pool.status_read_req) 260 mempool_destroy(adapter->pool.status_read_req); 261 if (adapter->pool.sr_data) 262 mempool_destroy(adapter->pool.sr_data); 263 if (adapter->pool.gid_pn) 264 mempool_destroy(adapter->pool.gid_pn); 265 } 266 267 /** 268 * zfcp_status_read_refill - refill the long running status_read_requests 269 * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled 270 * 271 * Returns: 0 on success, 1 otherwise 272 * 273 * if there are 16 or more status_read requests missing an adapter_reopen 274 * is triggered 275 */ 276 int zfcp_status_read_refill(struct zfcp_adapter *adapter) 277 { 278 while (atomic_read(&adapter->stat_miss) > 0) 279 if (zfcp_fsf_status_read(adapter->qdio)) { 280 if (atomic_read(&adapter->stat_miss) >= 281 adapter->stat_read_buf_num) { 282 zfcp_erp_adapter_reopen(adapter, 0, "axsref1"); 283 return 1; 284 } 285 break; 286 } else 287 atomic_dec(&adapter->stat_miss); 288 return 0; 289 } 290 291 static void _zfcp_status_read_scheduler(struct work_struct *work) 292 { 293 zfcp_status_read_refill(container_of(work, struct zfcp_adapter, 294 stat_work)); 295 } 296 297 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl) 298 { 299 struct zfcp_adapter *adapter = 300 container_of(sl, struct zfcp_adapter, service_level); 301 302 seq_printf(m, "zfcp: %s microcode level %x\n", 303 dev_name(&adapter->ccw_device->dev), 304 adapter->fsf_lic_version); 305 } 306 307 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter) 308 { 309 char name[TASK_COMM_LEN]; 310 311 snprintf(name, sizeof(name), "zfcp_q_%s", 312 dev_name(&adapter->ccw_device->dev)); 313 adapter->work_queue = create_singlethread_workqueue(name); 314 315 if (adapter->work_queue) 316 return 0; 317 return -ENOMEM; 318 } 319 320 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter) 321 { 322 if (adapter->work_queue) 323 destroy_workqueue(adapter->work_queue); 324 adapter->work_queue = NULL; 325 326 } 327 328 /** 329 * zfcp_adapter_enqueue - enqueue a new adapter to the list 330 * @ccw_device: pointer to the struct cc_device 331 * 332 * Returns: struct zfcp_adapter* 333 * Enqueues an adapter at the end of the adapter list in the driver data. 334 * All adapter internal structures are set up. 335 * Proc-fs entries are also created. 336 */ 337 struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device) 338 { 339 struct zfcp_adapter *adapter; 340 341 if (!get_device(&ccw_device->dev)) 342 return ERR_PTR(-ENODEV); 343 344 adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL); 345 if (!adapter) { 346 put_device(&ccw_device->dev); 347 return ERR_PTR(-ENOMEM); 348 } 349 350 kref_init(&adapter->ref); 351 352 ccw_device->handler = NULL; 353 adapter->ccw_device = ccw_device; 354 355 INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler); 356 INIT_DELAYED_WORK(&adapter->scan_work, zfcp_fc_scan_ports); 357 INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update); 358 359 adapter->next_port_scan = jiffies; 360 361 if (zfcp_qdio_setup(adapter)) 362 goto failed; 363 364 if (zfcp_allocate_low_mem_buffers(adapter)) 365 goto failed; 366 367 adapter->req_list = zfcp_reqlist_alloc(); 368 if (!adapter->req_list) 369 goto failed; 370 371 if (zfcp_dbf_adapter_register(adapter)) 372 goto failed; 373 374 if (zfcp_setup_adapter_work_queue(adapter)) 375 goto failed; 376 377 if (zfcp_fc_gs_setup(adapter)) 378 goto failed; 379 380 rwlock_init(&adapter->port_list_lock); 381 INIT_LIST_HEAD(&adapter->port_list); 382 383 INIT_LIST_HEAD(&adapter->events.list); 384 INIT_WORK(&adapter->events.work, zfcp_fc_post_event); 385 spin_lock_init(&adapter->events.list_lock); 386 387 init_waitqueue_head(&adapter->erp_ready_wq); 388 init_waitqueue_head(&adapter->erp_done_wqh); 389 390 INIT_LIST_HEAD(&adapter->erp_ready_head); 391 INIT_LIST_HEAD(&adapter->erp_running_head); 392 393 rwlock_init(&adapter->erp_lock); 394 rwlock_init(&adapter->abort_lock); 395 396 if (zfcp_erp_thread_setup(adapter)) 397 goto failed; 398 399 adapter->service_level.seq_print = zfcp_print_sl; 400 401 dev_set_drvdata(&ccw_device->dev, adapter); 402 403 if (sysfs_create_group(&ccw_device->dev.kobj, 404 &zfcp_sysfs_adapter_attrs)) 405 goto failed; 406 407 /* report size limit per scatter-gather segment */ 408 adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN; 409 adapter->ccw_device->dev.dma_parms = &adapter->dma_parms; 410 411 adapter->stat_read_buf_num = FSF_STATUS_READS_RECOM; 412 413 if (!zfcp_scsi_adapter_register(adapter)) 414 return adapter; 415 416 failed: 417 zfcp_adapter_unregister(adapter); 418 return ERR_PTR(-ENOMEM); 419 } 420 421 void zfcp_adapter_unregister(struct zfcp_adapter *adapter) 422 { 423 struct ccw_device *cdev = adapter->ccw_device; 424 425 cancel_delayed_work_sync(&adapter->scan_work); 426 cancel_work_sync(&adapter->stat_work); 427 cancel_work_sync(&adapter->ns_up_work); 428 zfcp_destroy_adapter_work_queue(adapter); 429 430 zfcp_fc_wka_ports_force_offline(adapter->gs); 431 zfcp_scsi_adapter_unregister(adapter); 432 sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs); 433 434 zfcp_erp_thread_kill(adapter); 435 zfcp_dbf_adapter_unregister(adapter); 436 zfcp_qdio_destroy(adapter->qdio); 437 438 zfcp_ccw_adapter_put(adapter); /* final put to release */ 439 } 440 441 /** 442 * zfcp_adapter_release - remove the adapter from the resource list 443 * @ref: pointer to struct kref 444 * locks: adapter list write lock is assumed to be held by caller 445 */ 446 void zfcp_adapter_release(struct kref *ref) 447 { 448 struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter, 449 ref); 450 struct ccw_device *cdev = adapter->ccw_device; 451 452 dev_set_drvdata(&adapter->ccw_device->dev, NULL); 453 zfcp_fc_gs_destroy(adapter); 454 zfcp_free_low_mem_buffers(adapter); 455 kfree(adapter->req_list); 456 kfree(adapter->fc_stats); 457 kfree(adapter->stats_reset_data); 458 kfree(adapter); 459 put_device(&cdev->dev); 460 } 461 462 static void zfcp_port_release(struct device *dev) 463 { 464 struct zfcp_port *port = container_of(dev, struct zfcp_port, dev); 465 466 zfcp_ccw_adapter_put(port->adapter); 467 kfree(port); 468 } 469 470 /** 471 * zfcp_port_enqueue - enqueue port to port list of adapter 472 * @adapter: adapter where remote port is added 473 * @wwpn: WWPN of the remote port to be enqueued 474 * @status: initial status for the port 475 * @d_id: destination id of the remote port to be enqueued 476 * Returns: pointer to enqueued port on success, ERR_PTR on error 477 * 478 * All port internal structures are set up and the sysfs entry is generated. 479 * d_id is used to enqueue ports with a well known address like the Directory 480 * Service for nameserver lookup. 481 */ 482 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn, 483 u32 status, u32 d_id) 484 { 485 struct zfcp_port *port; 486 int retval = -ENOMEM; 487 488 kref_get(&adapter->ref); 489 490 port = zfcp_get_port_by_wwpn(adapter, wwpn); 491 if (port) { 492 put_device(&port->dev); 493 retval = -EEXIST; 494 goto err_out; 495 } 496 497 port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL); 498 if (!port) 499 goto err_out; 500 501 rwlock_init(&port->unit_list_lock); 502 INIT_LIST_HEAD(&port->unit_list); 503 atomic_set(&port->units, 0); 504 505 INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup); 506 INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work); 507 INIT_WORK(&port->rport_work, zfcp_scsi_rport_work); 508 509 port->adapter = adapter; 510 port->d_id = d_id; 511 port->wwpn = wwpn; 512 port->rport_task = RPORT_NONE; 513 port->dev.parent = &adapter->ccw_device->dev; 514 port->dev.groups = zfcp_port_attr_groups; 515 port->dev.release = zfcp_port_release; 516 517 if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) { 518 kfree(port); 519 goto err_out; 520 } 521 retval = -EINVAL; 522 523 if (device_register(&port->dev)) { 524 put_device(&port->dev); 525 goto err_out; 526 } 527 528 write_lock_irq(&adapter->port_list_lock); 529 list_add_tail(&port->list, &adapter->port_list); 530 write_unlock_irq(&adapter->port_list_lock); 531 532 atomic_or(status | ZFCP_STATUS_COMMON_RUNNING, &port->status); 533 534 return port; 535 536 err_out: 537 zfcp_ccw_adapter_put(adapter); 538 return ERR_PTR(retval); 539 } 540 541 /** 542 * zfcp_sg_free_table - free memory used by scatterlists 543 * @sg: pointer to scatterlist 544 * @count: number of scatterlist which are to be free'ed 545 * the scatterlist are expected to reference pages always 546 */ 547 void zfcp_sg_free_table(struct scatterlist *sg, int count) 548 { 549 int i; 550 551 for (i = 0; i < count; i++, sg++) 552 if (sg) 553 free_page((unsigned long) sg_virt(sg)); 554 else 555 break; 556 } 557 558 /** 559 * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers 560 * @sg: pointer to struct scatterlist 561 * @count: number of scatterlists which should be assigned with buffers 562 * of size page 563 * 564 * Returns: 0 on success, -ENOMEM otherwise 565 */ 566 int zfcp_sg_setup_table(struct scatterlist *sg, int count) 567 { 568 void *addr; 569 int i; 570 571 sg_init_table(sg, count); 572 for (i = 0; i < count; i++, sg++) { 573 addr = (void *) get_zeroed_page(GFP_KERNEL); 574 if (!addr) { 575 zfcp_sg_free_table(sg, i); 576 return -ENOMEM; 577 } 578 sg_set_buf(sg, addr, PAGE_SIZE); 579 } 580 return 0; 581 } 582