drivers/s390/scsi/zfcp_aux.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Module interface and handling of zfcp data structures.
   6  *
   7  * Copyright IBM Corp. 2002, 2017
   8  */
   9
  10 /*
  11  * Driver authors:
  12  *            Martin Peschke (originator of the driver)
  13  *            Raimund Schroeder
  14  *            Aron Zeh
  15  *            Wolfgang Taphorn
  16  *            Stefan Bader
  17  *            Heiko Carstens (kernel 2.6 port of the driver)
  18  *            Andreas Herrmann
  19  *            Maxim Shchetynin
  20  *            Volker Sameske
  21  *            Ralph Wuerthner
  22  *            Michael Loehr
  23  *            Swen Schillig
  24  *            Christof Schmitt
  25  *            Martin Petermann
  26  *            Sven Schuetz
  27  *            Steffen Maier
  28  */
  29
  30 #define KMSG_COMPONENT "zfcp"
  31 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  32
  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         strlcpy(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         if (zfcp_experimental_dix)
 128                 pr_warn("DIX is enabled. It is experimental and might cause problems\n");
 129
 130         zfcp_fsf_qtcb_cache = zfcp_cache_hw_align("zfcp_fsf_qtcb",
 131                                                   sizeof(struct fsf_qtcb));
 132         if (!zfcp_fsf_qtcb_cache)
 133                 goto out_qtcb_cache;
 134
 135         zfcp_fc_req_cache = zfcp_cache_hw_align("zfcp_fc_req",
 136                                                 sizeof(struct zfcp_fc_req));
 137         if (!zfcp_fc_req_cache)
 138                 goto out_fc_cache;
 139
 140         zfcp_scsi_transport_template =
 141                 fc_attach_transport(&zfcp_transport_functions);
 142         if (!zfcp_scsi_transport_template)
 143                 goto out_transport;
 144         scsi_transport_reserve_device(zfcp_scsi_transport_template,
 145                                       sizeof(struct zfcp_scsi_dev));
 146
 147         retval = ccw_driver_register(&zfcp_ccw_driver);
 148         if (retval) {
 149                 pr_err("The zfcp device driver could not register with "
 150                        "the common I/O layer\n");
 151                 goto out_ccw_register;
 152         }
 153
 154         if (init_device)
 155                 zfcp_init_device_setup(init_device);
 156         return 0;
 157
 158 out_ccw_register:
 159         fc_release_transport(zfcp_scsi_transport_template);
 160 out_transport:
 161         kmem_cache_destroy(zfcp_fc_req_cache);
 162 out_fc_cache:
 163         kmem_cache_destroy(zfcp_fsf_qtcb_cache);
 164 out_qtcb_cache:
 165         return retval;
 166 }
 167
 168 module_init(zfcp_module_init);
 169
 170 static void __exit zfcp_module_exit(void)
 171 {
 172         ccw_driver_unregister(&zfcp_ccw_driver);
 173         fc_release_transport(zfcp_scsi_transport_template);
 174         kmem_cache_destroy(zfcp_fc_req_cache);
 175         kmem_cache_destroy(zfcp_fsf_qtcb_cache);
 176 }
 177
 178 module_exit(zfcp_module_exit);
 179
 180 /**
 181  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 182  * @adapter: pointer to adapter to search for port
 183  * @wwpn: wwpn to search for
 184  *
 185  * Returns: pointer to zfcp_port or NULL
 186  */
 187 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
 188                                         u64 wwpn)
 189 {
 190         unsigned long flags;
 191         struct zfcp_port *port;
 192
 193         read_lock_irqsave(&adapter->port_list_lock, flags);
 194         list_for_each_entry(port, &adapter->port_list, list)
 195                 if (port->wwpn == wwpn) {
 196                         if (!get_device(&port->dev))
 197                                 port = NULL;
 198                         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 199                         return port;
 200                 }
 201         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 202         return NULL;
 203 }
 204
 205 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 206 {
 207         adapter->pool.erp_req =
 208                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 209         if (!adapter->pool.erp_req)
 210                 return -ENOMEM;
 211
 212         adapter->pool.gid_pn_req =
 213                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 214         if (!adapter->pool.gid_pn_req)
 215                 return -ENOMEM;
 216
 217         adapter->pool.scsi_req =
 218                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 219         if (!adapter->pool.scsi_req)
 220                 return -ENOMEM;
 221
 222         adapter->pool.scsi_abort =
 223                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 224         if (!adapter->pool.scsi_abort)
 225                 return -ENOMEM;
 226
 227         adapter->pool.status_read_req =
 228                 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
 229                                             sizeof(struct zfcp_fsf_req));
 230         if (!adapter->pool.status_read_req)
 231                 return -ENOMEM;
 232
 233         adapter->pool.qtcb_pool =
 234                 mempool_create_slab_pool(4, zfcp_fsf_qtcb_cache);
 235         if (!adapter->pool.qtcb_pool)
 236                 return -ENOMEM;
 237
 238         BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE);
 239         adapter->pool.sr_data =
 240                 mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0);
 241         if (!adapter->pool.sr_data)
 242                 return -ENOMEM;
 243
 244         adapter->pool.gid_pn =
 245                 mempool_create_slab_pool(1, zfcp_fc_req_cache);
 246         if (!adapter->pool.gid_pn)
 247                 return -ENOMEM;
 248
 249         return 0;
 250 }
 251
 252 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 253 {
 254         mempool_destroy(adapter->pool.erp_req);
 255         mempool_destroy(adapter->pool.scsi_req);
 256         mempool_destroy(adapter->pool.scsi_abort);
 257         mempool_destroy(adapter->pool.qtcb_pool);
 258         mempool_destroy(adapter->pool.status_read_req);
 259         mempool_destroy(adapter->pool.sr_data);
 260         mempool_destroy(adapter->pool.gid_pn);
 261 }
 262
 263 /**
 264  * zfcp_status_read_refill - refill the long running status_read_requests
 265  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
 266  *
 267  * Return:
 268  * * 0 on success meaning at least one status read is pending
 269  * * 1 if posting failed and not a single status read buffer is pending,
 270  *     also triggers adapter reopen recovery
 271  */
 272 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 273 {
 274         while (atomic_add_unless(&adapter->stat_miss, -1, 0))
 275                 if (zfcp_fsf_status_read(adapter->qdio)) {
 276                         atomic_inc(&adapter->stat_miss); /* undo add -1 */
 277                         if (atomic_read(&adapter->stat_miss) >=
 278                             adapter->stat_read_buf_num) {
 279                                 zfcp_erp_adapter_reopen(adapter, 0, "axsref1");
 280                                 return 1;
 281                         }
 282                         break;
 283                 }
 284         return 0;
 285 }
 286
 287 static void _zfcp_status_read_scheduler(struct work_struct *work)
 288 {
 289         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 290                                              stat_work));
 291 }
 292
 293 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
 294 {
 295         struct zfcp_adapter *adapter =
 296                 container_of(sl, struct zfcp_adapter, service_level);
 297
 298         seq_printf(m, "zfcp: %s microcode level %x\n",
 299                    dev_name(&adapter->ccw_device->dev),
 300                    adapter->fsf_lic_version);
 301 }
 302
 303 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
 304 {
 305         char name[TASK_COMM_LEN];
 306
 307         snprintf(name, sizeof(name), "zfcp_q_%s",
 308                  dev_name(&adapter->ccw_device->dev));
 309         adapter->work_queue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
 310
 311         if (adapter->work_queue)
 312                 return 0;
 313         return -ENOMEM;
 314 }
 315
 316 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
 317 {
 318         if (adapter->work_queue)
 319                 destroy_workqueue(adapter->work_queue);
 320         adapter->work_queue = NULL;
 321
 322 }
 323
 324 /**
 325  * zfcp_adapter_enqueue - enqueue a new adapter to the list
 326  * @ccw_device: pointer to the struct cc_device
 327  *
 328  * Returns:     struct zfcp_adapter*
 329  * Enqueues an adapter at the end of the adapter list in the driver data.
 330  * All adapter internal structures are set up.
 331  * Proc-fs entries are also created.
 332  */
 333 struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 334 {
 335         struct zfcp_adapter *adapter;
 336
 337         if (!get_device(&ccw_device->dev))
 338                 return ERR_PTR(-ENODEV);
 339
 340         adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
 341         if (!adapter) {
 342                 put_device(&ccw_device->dev);
 343                 return ERR_PTR(-ENOMEM);
 344         }
 345
 346         kref_init(&adapter->ref);
 347
 348         ccw_device->handler = NULL;
 349         adapter->ccw_device = ccw_device;
 350
 351         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
 352         INIT_DELAYED_WORK(&adapter->scan_work, zfcp_fc_scan_ports);
 353         INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update);
 354
 355         adapter->next_port_scan = jiffies;
 356
 357         adapter->erp_action.adapter = adapter;
 358
 359         if (zfcp_qdio_setup(adapter))
 360                 goto failed;
 361
 362         if (zfcp_allocate_low_mem_buffers(adapter))
 363                 goto failed;
 364
 365         adapter->req_list = zfcp_reqlist_alloc();
 366         if (!adapter->req_list)
 367                 goto failed;
 368
 369         if (zfcp_dbf_adapter_register(adapter))
 370                 goto failed;
 371
 372         if (zfcp_setup_adapter_work_queue(adapter))
 373                 goto failed;
 374
 375         if (zfcp_fc_gs_setup(adapter))
 376                 goto failed;
 377
 378         rwlock_init(&adapter->port_list_lock);
 379         INIT_LIST_HEAD(&adapter->port_list);
 380
 381         INIT_LIST_HEAD(&adapter->events.list);
 382         INIT_WORK(&adapter->events.work, zfcp_fc_post_event);
 383         spin_lock_init(&adapter->events.list_lock);
 384
 385         init_waitqueue_head(&adapter->erp_ready_wq);
 386         init_waitqueue_head(&adapter->erp_done_wqh);
 387
 388         INIT_LIST_HEAD(&adapter->erp_ready_head);
 389         INIT_LIST_HEAD(&adapter->erp_running_head);
 390
 391         rwlock_init(&adapter->erp_lock);
 392         rwlock_init(&adapter->abort_lock);
 393
 394         if (zfcp_erp_thread_setup(adapter))
 395                 goto failed;
 396
 397         adapter->service_level.seq_print = zfcp_print_sl;
 398
 399         dev_set_drvdata(&ccw_device->dev, adapter);
 400
 401         if (sysfs_create_group(&ccw_device->dev.kobj,
 402                                &zfcp_sysfs_adapter_attrs))
 403                 goto failed;
 404
 405         /* report size limit per scatter-gather segment */
 406         adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN;
 407         adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
 408
 409         adapter->stat_read_buf_num = FSF_STATUS_READS_RECOM;
 410
 411         if (!zfcp_scsi_adapter_register(adapter))
 412                 return adapter;
 413
 414 failed:
 415         zfcp_adapter_unregister(adapter);
 416         return ERR_PTR(-ENOMEM);
 417 }
 418
 419 void zfcp_adapter_unregister(struct zfcp_adapter *adapter)
 420 {
 421         struct ccw_device *cdev = adapter->ccw_device;
 422
 423         cancel_delayed_work_sync(&adapter->scan_work);
 424         cancel_work_sync(&adapter->stat_work);
 425         cancel_work_sync(&adapter->ns_up_work);
 426         zfcp_destroy_adapter_work_queue(adapter);
 427
 428         zfcp_fc_wka_ports_force_offline(adapter->gs);
 429         zfcp_scsi_adapter_unregister(adapter);
 430         sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs);
 431
 432         zfcp_erp_thread_kill(adapter);
 433         zfcp_dbf_adapter_unregister(adapter);
 434         zfcp_qdio_destroy(adapter->qdio);
 435
 436         zfcp_ccw_adapter_put(adapter); /* final put to release */
 437 }
 438
 439 /**
 440  * zfcp_adapter_release - remove the adapter from the resource list
 441  * @ref: pointer to struct kref
 442  * locks:       adapter list write lock is assumed to be held by caller
 443  */
 444 void zfcp_adapter_release(struct kref *ref)
 445 {
 446         struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter,
 447                                                     ref);
 448         struct ccw_device *cdev = adapter->ccw_device;
 449
 450         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
 451         zfcp_fc_gs_destroy(adapter);
 452         zfcp_free_low_mem_buffers(adapter);
 453         kfree(adapter->req_list);
 454         kfree(adapter->fc_stats);
 455         kfree(adapter->stats_reset_data);
 456         kfree(adapter);
 457         put_device(&cdev->dev);
 458 }
 459
 460 static void zfcp_port_release(struct device *dev)
 461 {
 462         struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
 463
 464         zfcp_ccw_adapter_put(port->adapter);
 465         kfree(port);
 466 }
 467
 468 /**
 469  * zfcp_port_enqueue - enqueue port to port list of adapter
 470  * @adapter: adapter where remote port is added
 471  * @wwpn: WWPN of the remote port to be enqueued
 472  * @status: initial status for the port
 473  * @d_id: destination id of the remote port to be enqueued
 474  * Returns: pointer to enqueued port on success, ERR_PTR on error
 475  *
 476  * All port internal structures are set up and the sysfs entry is generated.
 477  * d_id is used to enqueue ports with a well known address like the Directory
 478  * Service for nameserver lookup.
 479  */
 480 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
 481                                      u32 status, u32 d_id)
 482 {
 483         struct zfcp_port *port;
 484         int retval = -ENOMEM;
 485
 486         kref_get(&adapter->ref);
 487
 488         port = zfcp_get_port_by_wwpn(adapter, wwpn);
 489         if (port) {
 490                 put_device(&port->dev);
 491                 retval = -EEXIST;
 492                 goto err_out;
 493         }
 494
 495         port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
 496         if (!port)
 497                 goto err_out;
 498
 499         rwlock_init(&port->unit_list_lock);
 500         INIT_LIST_HEAD(&port->unit_list);
 501         atomic_set(&port->units, 0);
 502
 503         INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
 504         INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
 505         INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
 506
 507         port->adapter = adapter;
 508         port->d_id = d_id;
 509         port->wwpn = wwpn;
 510         port->rport_task = RPORT_NONE;
 511         port->dev.parent = &adapter->ccw_device->dev;
 512         port->dev.groups = zfcp_port_attr_groups;
 513         port->dev.release = zfcp_port_release;
 514
 515         port->erp_action.adapter = adapter;
 516         port->erp_action.port = port;
 517
 518         if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
 519                 kfree(port);
 520                 goto err_out;
 521         }
 522         retval = -EINVAL;
 523
 524         if (device_register(&port->dev)) {
 525                 put_device(&port->dev);
 526                 goto err_out;
 527         }
 528
 529         write_lock_irq(&adapter->port_list_lock);
 530         list_add_tail(&port->list, &adapter->port_list);
 531         write_unlock_irq(&adapter->port_list_lock);
 532
 533         atomic_or(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);
 534
 535         return port;
 536
 537 err_out:
 538         zfcp_ccw_adapter_put(adapter);
 539         return ERR_PTR(retval);
 540 }