kernel/drivers/s390/scsi/zfcp_aux.c

   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_set_mask(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 }