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, 2020
   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  *            Benjamin Block
  29  */
  30
  31 #define KMSG_COMPONENT "zfcp"
  32 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  33
  34 #include <linux/seq_file.h>
  35 #include <linux/slab.h>
  36 #include <linux/module.h>
  37 #include "zfcp_ext.h"
  38 #include "zfcp_fc.h"
  39 #include "zfcp_reqlist.h"
  40 #include "zfcp_diag.h"
  41
  42 #define ZFCP_BUS_ID_SIZE        20
  43
  44 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
  45 MODULE_DESCRIPTION("FCP HBA driver");
  46 MODULE_LICENSE("GPL");
  47
  48 static char *init_device;
  49 module_param_named(device, init_device, charp, 0400);
  50 MODULE_PARM_DESC(device, "specify initial device");
  51
  52 static struct kmem_cache * __init zfcp_cache_hw_align(const char *name,
  53                                                       unsigned long size)
  54 {
  55         return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL);
  56 }
  57
  58 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
  59 {
  60         struct ccw_device *cdev;
  61         struct zfcp_adapter *adapter;
  62         struct zfcp_port *port;
  63
  64         cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
  65         if (!cdev)
  66                 return;
  67
  68         if (ccw_device_set_online(cdev))
  69                 goto out_ccw_device;
  70
  71         adapter = zfcp_ccw_adapter_by_cdev(cdev);
  72         if (!adapter)
  73                 goto out_ccw_device;
  74
  75         port = zfcp_get_port_by_wwpn(adapter, wwpn);
  76         if (!port)
  77                 goto out_port;
  78         flush_work(&port->rport_work);
  79
  80         zfcp_unit_add(port, lun);
  81         put_device(&port->dev);
  82
  83 out_port:
  84         zfcp_ccw_adapter_put(adapter);
  85 out_ccw_device:
  86         put_device(&cdev->dev);
  87         return;
  88 }
  89
  90 static void __init zfcp_init_device_setup(char *devstr)
  91 {
  92         char *token;
  93         char *str, *str_saved;
  94         char busid[ZFCP_BUS_ID_SIZE];
  95         u64 wwpn, lun;
  96
  97         /* duplicate devstr and keep the original for sysfs presentation*/
  98         str_saved = kstrdup(devstr, GFP_KERNEL);
  99         str = str_saved;
 100         if (!str)
 101                 return;
 102
 103         token = strsep(&str, ",");
 104         if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
 105                 goto err_out;
 106         strlcpy(busid, token, ZFCP_BUS_ID_SIZE);
 107
 108         token = strsep(&str, ",");
 109         if (!token || kstrtoull(token, 0, (unsigned long long *) &wwpn))
 110                 goto err_out;
 111
 112         token = strsep(&str, ",");
 113         if (!token || kstrtoull(token, 0, (unsigned long long *) &lun))
 114                 goto err_out;
 115
 116         kfree(str_saved);
 117         zfcp_init_device_configure(busid, wwpn, lun);
 118         return;
 119
 120 err_out:
 121         kfree(str_saved);
 122         pr_err("%s is not a valid SCSI device\n", devstr);
 123 }
 124
 125 static int __init zfcp_module_init(void)
 126 {
 127         int retval = -ENOMEM;
 128
 129         if (zfcp_experimental_dix)
 130                 pr_warn("DIX is enabled. It is experimental and might cause problems\n");
 131
 132         zfcp_fsf_qtcb_cache = zfcp_cache_hw_align("zfcp_fsf_qtcb",
 133                                                   sizeof(struct fsf_qtcb));
 134         if (!zfcp_fsf_qtcb_cache)
 135                 goto out_qtcb_cache;
 136
 137         zfcp_fc_req_cache = zfcp_cache_hw_align("zfcp_fc_req",
 138                                                 sizeof(struct zfcp_fc_req));
 139         if (!zfcp_fc_req_cache)
 140                 goto out_fc_cache;
 141
 142         zfcp_scsi_transport_template =
 143                 fc_attach_transport(&zfcp_transport_functions);
 144         if (!zfcp_scsi_transport_template)
 145                 goto out_transport;
 146         scsi_transport_reserve_device(zfcp_scsi_transport_template,
 147                                       sizeof(struct zfcp_scsi_dev));
 148
 149         retval = ccw_driver_register(&zfcp_ccw_driver);
 150         if (retval) {
 151                 pr_err("The zfcp device driver could not register with "
 152                        "the common I/O layer\n");
 153                 goto out_ccw_register;
 154         }
 155
 156         if (init_device)
 157                 zfcp_init_device_setup(init_device);
 158         return 0;
 159
 160 out_ccw_register:
 161         fc_release_transport(zfcp_scsi_transport_template);
 162 out_transport:
 163         kmem_cache_destroy(zfcp_fc_req_cache);
 164 out_fc_cache:
 165         kmem_cache_destroy(zfcp_fsf_qtcb_cache);
 166 out_qtcb_cache:
 167         return retval;
 168 }
 169
 170 module_init(zfcp_module_init);
 171
 172 static void __exit zfcp_module_exit(void)
 173 {
 174         ccw_driver_unregister(&zfcp_ccw_driver);
 175         fc_release_transport(zfcp_scsi_transport_template);
 176         kmem_cache_destroy(zfcp_fc_req_cache);
 177         kmem_cache_destroy(zfcp_fsf_qtcb_cache);
 178 }
 179
 180 module_exit(zfcp_module_exit);
 181
 182 /**
 183  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
 184  * @adapter: pointer to adapter to search for port
 185  * @wwpn: wwpn to search for
 186  *
 187  * Returns: pointer to zfcp_port or NULL
 188  */
 189 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
 190                                         u64 wwpn)
 191 {
 192         unsigned long flags;
 193         struct zfcp_port *port;
 194
 195         read_lock_irqsave(&adapter->port_list_lock, flags);
 196         list_for_each_entry(port, &adapter->port_list, list)
 197                 if (port->wwpn == wwpn) {
 198                         if (!get_device(&port->dev))
 199                                 port = NULL;
 200                         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 201                         return port;
 202                 }
 203         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 204         return NULL;
 205 }
 206
 207 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 208 {
 209         adapter->pool.erp_req =
 210                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 211         if (!adapter->pool.erp_req)
 212                 return -ENOMEM;
 213
 214         adapter->pool.gid_pn_req =
 215                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 216         if (!adapter->pool.gid_pn_req)
 217                 return -ENOMEM;
 218
 219         adapter->pool.scsi_req =
 220                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 221         if (!adapter->pool.scsi_req)
 222                 return -ENOMEM;
 223
 224         adapter->pool.scsi_abort =
 225                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
 226         if (!adapter->pool.scsi_abort)
 227                 return -ENOMEM;
 228
 229         adapter->pool.status_read_req =
 230                 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
 231                                             sizeof(struct zfcp_fsf_req));
 232         if (!adapter->pool.status_read_req)
 233                 return -ENOMEM;
 234
 235         adapter->pool.qtcb_pool =
 236                 mempool_create_slab_pool(4, zfcp_fsf_qtcb_cache);
 237         if (!adapter->pool.qtcb_pool)
 238                 return -ENOMEM;
 239
 240         BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE);
 241         adapter->pool.sr_data =
 242                 mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0);
 243         if (!adapter->pool.sr_data)
 244                 return -ENOMEM;
 245
 246         adapter->pool.gid_pn =
 247                 mempool_create_slab_pool(1, zfcp_fc_req_cache);
 248         if (!adapter->pool.gid_pn)
 249                 return -ENOMEM;
 250
 251         return 0;
 252 }
 253
 254 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 255 {
 256         mempool_destroy(adapter->pool.erp_req);
 257         mempool_destroy(adapter->pool.scsi_req);
 258         mempool_destroy(adapter->pool.scsi_abort);
 259         mempool_destroy(adapter->pool.qtcb_pool);
 260         mempool_destroy(adapter->pool.status_read_req);
 261         mempool_destroy(adapter->pool.sr_data);
 262         mempool_destroy(adapter->pool.gid_pn);
 263 }
 264
 265 /**
 266  * zfcp_status_read_refill - refill the long running status_read_requests
 267  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
 268  *
 269  * Return:
 270  * * 0 on success meaning at least one status read is pending
 271  * * 1 if posting failed and not a single status read buffer is pending,
 272  *     also triggers adapter reopen recovery
 273  */
 274 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
 275 {
 276         while (atomic_add_unless(&adapter->stat_miss, -1, 0))
 277                 if (zfcp_fsf_status_read(adapter->qdio)) {
 278                         atomic_inc(&adapter->stat_miss); /* undo add -1 */
 279                         if (atomic_read(&adapter->stat_miss) >=
 280                             adapter->stat_read_buf_num) {
 281                                 zfcp_erp_adapter_reopen(adapter, 0, "axsref1");
 282                                 return 1;
 283                         }
 284                         break;
 285                 }
 286         return 0;
 287 }
 288
 289 static void _zfcp_status_read_scheduler(struct work_struct *work)
 290 {
 291         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
 292                                              stat_work));
 293 }
 294
 295 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
 296 {
 297         struct zfcp_adapter *adapter =
 298                 container_of(sl, struct zfcp_adapter, service_level);
 299
 300         seq_printf(m, "zfcp: %s microcode level %x\n",
 301                    dev_name(&adapter->ccw_device->dev),
 302                    adapter->fsf_lic_version);
 303 }
 304
 305 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
 306 {
 307         char name[TASK_COMM_LEN];
 308
 309         snprintf(name, sizeof(name), "zfcp_q_%s",
 310                  dev_name(&adapter->ccw_device->dev));
 311         adapter->work_queue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
 312
 313         if (adapter->work_queue)
 314                 return 0;
 315         return -ENOMEM;
 316 }
 317
 318 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
 319 {
 320         if (adapter->work_queue)
 321                 destroy_workqueue(adapter->work_queue);
 322         adapter->work_queue = NULL;
 323
 324 }
 325
 326 /**
 327  * zfcp_adapter_enqueue - enqueue a new adapter to the list
 328  * @ccw_device: pointer to the struct cc_device
 329  *
 330  * Returns:     struct zfcp_adapter*
 331  * Enqueues an adapter at the end of the adapter list in the driver data.
 332  * All adapter internal structures are set up.
 333  * Proc-fs entries are also created.
 334  */
 335 struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 336 {
 337         struct zfcp_adapter *adapter;
 338
 339         if (!get_device(&ccw_device->dev))
 340                 return ERR_PTR(-ENODEV);
 341
 342         adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
 343         if (!adapter) {
 344                 put_device(&ccw_device->dev);
 345                 return ERR_PTR(-ENOMEM);
 346         }
 347
 348         kref_init(&adapter->ref);
 349
 350         ccw_device->handler = NULL;
 351         adapter->ccw_device = ccw_device;
 352
 353         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
 354         INIT_DELAYED_WORK(&adapter->scan_work, zfcp_fc_scan_ports);
 355         INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update);
 356
 357         adapter->next_port_scan = jiffies;
 358
 359         adapter->erp_action.adapter = adapter;
 360
 361         if (zfcp_diag_adapter_setup(adapter))
 362                 goto failed;
 363
 364         if (zfcp_qdio_setup(adapter))
 365                 goto failed;
 366
 367         if (zfcp_allocate_low_mem_buffers(adapter))
 368                 goto failed;
 369
 370         adapter->req_list = zfcp_reqlist_alloc();
 371         if (!adapter->req_list)
 372                 goto failed;
 373
 374         if (zfcp_dbf_adapter_register(adapter))
 375                 goto failed;
 376
 377         if (zfcp_setup_adapter_work_queue(adapter))
 378                 goto failed;
 379
 380         if (zfcp_fc_gs_setup(adapter))
 381                 goto failed;
 382
 383         rwlock_init(&adapter->port_list_lock);
 384         INIT_LIST_HEAD(&adapter->port_list);
 385
 386         INIT_LIST_HEAD(&adapter->events.list);
 387         INIT_WORK(&adapter->events.work, zfcp_fc_post_event);
 388         spin_lock_init(&adapter->events.list_lock);
 389
 390         init_waitqueue_head(&adapter->erp_ready_wq);
 391         init_waitqueue_head(&adapter->erp_done_wqh);
 392
 393         INIT_LIST_HEAD(&adapter->erp_ready_head);
 394         INIT_LIST_HEAD(&adapter->erp_running_head);
 395
 396         rwlock_init(&adapter->erp_lock);
 397         rwlock_init(&adapter->abort_lock);
 398
 399         if (zfcp_erp_thread_setup(adapter))
 400                 goto failed;
 401
 402         adapter->service_level.seq_print = zfcp_print_sl;
 403
 404         dev_set_drvdata(&ccw_device->dev, adapter);
 405
 406         if (sysfs_create_group(&ccw_device->dev.kobj,
 407                                &zfcp_sysfs_adapter_attrs))
 408                 goto failed;
 409
 410         if (zfcp_diag_sysfs_setup(adapter))
 411                 goto failed;
 412
 413         /* report size limit per scatter-gather segment */
 414         adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
 415
 416         adapter->stat_read_buf_num = FSF_STATUS_READS_RECOM;
 417
 418         return adapter;
 419
 420 failed:
 421         zfcp_adapter_unregister(adapter);
 422         return ERR_PTR(-ENOMEM);
 423 }
 424
 425 void zfcp_adapter_unregister(struct zfcp_adapter *adapter)
 426 {
 427         struct ccw_device *cdev = adapter->ccw_device;
 428
 429         cancel_delayed_work_sync(&adapter->scan_work);
 430         cancel_work_sync(&adapter->stat_work);
 431         cancel_work_sync(&adapter->ns_up_work);
 432         zfcp_destroy_adapter_work_queue(adapter);
 433
 434         zfcp_fc_wka_ports_force_offline(adapter->gs);
 435         zfcp_scsi_adapter_unregister(adapter);
 436         zfcp_diag_sysfs_destroy(adapter);
 437         sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs);
 438
 439         zfcp_erp_thread_kill(adapter);
 440         zfcp_dbf_adapter_unregister(adapter);
 441         zfcp_qdio_destroy(adapter->qdio);
 442
 443         zfcp_ccw_adapter_put(adapter); /* final put to release */
 444 }
 445
 446 /**
 447  * zfcp_adapter_release - remove the adapter from the resource list
 448  * @ref: pointer to struct kref
 449  * locks:       adapter list write lock is assumed to be held by caller
 450  */
 451 void zfcp_adapter_release(struct kref *ref)
 452 {
 453         struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter,
 454                                                     ref);
 455         struct ccw_device *cdev = adapter->ccw_device;
 456
 457         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
 458         zfcp_fc_gs_destroy(adapter);
 459         zfcp_free_low_mem_buffers(adapter);
 460         zfcp_diag_adapter_free(adapter);
 461         kfree(adapter->req_list);
 462         kfree(adapter->fc_stats);
 463         kfree(adapter->stats_reset_data);
 464         kfree(adapter);
 465         put_device(&cdev->dev);
 466 }
 467
 468 static void zfcp_port_release(struct device *dev)
 469 {
 470         struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
 471
 472         zfcp_ccw_adapter_put(port->adapter);
 473         kfree(port);
 474 }
 475
 476 /**
 477  * zfcp_port_enqueue - enqueue port to port list of adapter
 478  * @adapter: adapter where remote port is added
 479  * @wwpn: WWPN of the remote port to be enqueued
 480  * @status: initial status for the port
 481  * @d_id: destination id of the remote port to be enqueued
 482  * Returns: pointer to enqueued port on success, ERR_PTR on error
 483  *
 484  * All port internal structures are set up and the sysfs entry is generated.
 485  * d_id is used to enqueue ports with a well known address like the Directory
 486  * Service for nameserver lookup.
 487  */
 488 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
 489                                      u32 status, u32 d_id)
 490 {
 491         struct zfcp_port *port;
 492         int retval = -ENOMEM;
 493
 494         kref_get(&adapter->ref);
 495
 496         port = zfcp_get_port_by_wwpn(adapter, wwpn);
 497         if (port) {
 498                 put_device(&port->dev);
 499                 retval = -EEXIST;
 500                 goto err_out;
 501         }
 502
 503         port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
 504         if (!port)
 505                 goto err_out;
 506
 507         rwlock_init(&port->unit_list_lock);
 508         INIT_LIST_HEAD(&port->unit_list);
 509         atomic_set(&port->units, 0);
 510
 511         INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
 512         INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
 513         INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
 514
 515         port->adapter = adapter;
 516         port->d_id = d_id;
 517         port->wwpn = wwpn;
 518         port->rport_task = RPORT_NONE;
 519         port->dev.parent = &adapter->ccw_device->dev;
 520         port->dev.groups = zfcp_port_attr_groups;
 521         port->dev.release = zfcp_port_release;
 522
 523         port->erp_action.adapter = adapter;
 524         port->erp_action.port = port;
 525
 526         if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
 527                 kfree(port);
 528                 goto err_out;
 529         }
 530         retval = -EINVAL;
 531
 532         if (device_register(&port->dev)) {
 533                 put_device(&port->dev);
 534                 goto err_out;
 535         }
 536
 537         write_lock_irq(&adapter->port_list_lock);
 538         list_add_tail(&port->list, &adapter->port_list);
 539         write_unlock_irq(&adapter->port_list_lock);
 540
 541         atomic_or(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);
 542
 543         return port;
 544
 545 err_out:
 546         zfcp_ccw_adapter_put(adapter);
 547         return ERR_PTR(retval);
 548 }