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1// SPDX-License-Identifier: GPL-2.02/*3 * zfcp device driver4 *5 * Module interface and handling of zfcp data structures.6 *7 * Copyright IBM Corp. 2002, 20208 */9 10/*11 * Driver authors:12 * Martin Peschke (originator of the driver)13 * Raimund Schroeder14 * Aron Zeh15 * Wolfgang Taphorn16 * Stefan Bader17 * Heiko Carstens (kernel 2.6 port of the driver)18 * Andreas Herrmann19 * Maxim Shchetynin20 * Volker Sameske21 * Ralph Wuerthner22 * Michael Loehr23 * Swen Schillig24 * Christof Schmitt25 * Martin Petermann26 * Sven Schuetz27 * Steffen Maier28 * Benjamin Block29 */30 31#define KMSG_COMPONENT "zfcp"32#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt33 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 2043 44MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");45MODULE_DESCRIPTION("FCP HBA driver");46MODULE_LICENSE("GPL");47 48static char *init_device;49module_param_named(device, init_device, charp, 0400);50MODULE_PARM_DESC(device, "specify initial device");51 52static 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 58static 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 83out_port:84 zfcp_ccw_adapter_put(adapter);85out_ccw_device:86 put_device(&cdev->dev);87 return;88}89 90static 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 strscpy(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 120err_out:121 kfree(str_saved);122 pr_err("%s is not a valid SCSI device\n", devstr);123}124 125static 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 160out_ccw_register:161 fc_release_transport(zfcp_scsi_transport_template);162out_transport:163 kmem_cache_destroy(zfcp_fc_req_cache);164out_fc_cache:165 kmem_cache_destroy(zfcp_fsf_qtcb_cache);166out_qtcb_cache:167 return retval;168}169 170module_init(zfcp_module_init);171 172static 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 180module_exit(zfcp_module_exit);181 182/**183 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn184 * @adapter: pointer to adapter to search for port185 * @wwpn: wwpn to search for186 *187 * Returns: pointer to zfcp_port or NULL188 */189struct 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 207static 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 254static 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_requests267 * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled268 *269 * Return:270 * * 0 on success meaning at least one status read is pending271 * * 1 if posting failed and not a single status read buffer is pending,272 * also triggers adapter reopen recovery273 */274int 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 289static 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 295static void zfcp_version_change_lost_work(struct work_struct *work)296{297 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,298 version_change_lost_work);299 300 zfcp_fsf_exchange_config_data_sync(adapter->qdio, NULL);301}302 303static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)304{305 struct zfcp_adapter *adapter =306 container_of(sl, struct zfcp_adapter, service_level);307 308 seq_printf(m, "zfcp: %s microcode level %x\n",309 dev_name(&adapter->ccw_device->dev),310 adapter->fsf_lic_version);311}312 313static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)314{315 char name[TASK_COMM_LEN];316 317 snprintf(name, sizeof(name), "zfcp_q_%s",318 dev_name(&adapter->ccw_device->dev));319 adapter->work_queue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);320 321 if (adapter->work_queue)322 return 0;323 return -ENOMEM;324}325 326static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)327{328 if (adapter->work_queue)329 destroy_workqueue(adapter->work_queue);330 adapter->work_queue = NULL;331 332}333 334/**335 * zfcp_adapter_enqueue - enqueue a new adapter to the list336 * @ccw_device: pointer to the struct cc_device337 *338 * Returns: struct zfcp_adapter*339 * Enqueues an adapter at the end of the adapter list in the driver data.340 * All adapter internal structures are set up.341 * Proc-fs entries are also created.342 */343struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)344{345 struct zfcp_adapter *adapter;346 347 if (!get_device(&ccw_device->dev))348 return ERR_PTR(-ENODEV);349 350 adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);351 if (!adapter) {352 put_device(&ccw_device->dev);353 return ERR_PTR(-ENOMEM);354 }355 356 kref_init(&adapter->ref);357 358 ccw_device->handler = NULL;359 adapter->ccw_device = ccw_device;360 361 INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);362 INIT_DELAYED_WORK(&adapter->scan_work, zfcp_fc_scan_ports);363 INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update);364 INIT_WORK(&adapter->version_change_lost_work,365 zfcp_version_change_lost_work);366 367 adapter->next_port_scan = jiffies;368 369 adapter->erp_action.adapter = adapter;370 371 if (zfcp_diag_adapter_setup(adapter))372 goto failed;373 374 if (zfcp_qdio_setup(adapter))375 goto failed;376 377 if (zfcp_allocate_low_mem_buffers(adapter))378 goto failed;379 380 adapter->req_list = zfcp_reqlist_alloc();381 if (!adapter->req_list)382 goto failed;383 384 if (zfcp_dbf_adapter_register(adapter))385 goto failed;386 387 if (zfcp_setup_adapter_work_queue(adapter))388 goto failed;389 390 if (zfcp_fc_gs_setup(adapter))391 goto failed;392 393 rwlock_init(&adapter->port_list_lock);394 INIT_LIST_HEAD(&adapter->port_list);395 396 INIT_LIST_HEAD(&adapter->events.list);397 INIT_WORK(&adapter->events.work, zfcp_fc_post_event);398 spin_lock_init(&adapter->events.list_lock);399 400 init_waitqueue_head(&adapter->erp_ready_wq);401 init_waitqueue_head(&adapter->erp_done_wqh);402 403 INIT_LIST_HEAD(&adapter->erp_ready_head);404 INIT_LIST_HEAD(&adapter->erp_running_head);405 406 rwlock_init(&adapter->erp_lock);407 rwlock_init(&adapter->abort_lock);408 409 if (zfcp_erp_thread_setup(adapter))410 goto failed;411 412 adapter->service_level.seq_print = zfcp_print_sl;413 414 dev_set_drvdata(&ccw_device->dev, adapter);415 416 if (device_add_groups(&ccw_device->dev, zfcp_sysfs_adapter_attr_groups))417 goto err_sysfs;418 419 /* report size limit per scatter-gather segment */420 adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;421 422 adapter->stat_read_buf_num = FSF_STATUS_READS_RECOM;423 424 return adapter;425 426err_sysfs:427failed:428 /* TODO: make this more fine-granular */429 cancel_delayed_work_sync(&adapter->scan_work);430 cancel_work_sync(&adapter->stat_work);431 cancel_work_sync(&adapter->ns_up_work);432 cancel_work_sync(&adapter->version_change_lost_work);433 zfcp_destroy_adapter_work_queue(adapter);434 435 zfcp_fc_wka_ports_force_offline(adapter->gs);436 zfcp_scsi_adapter_unregister(adapter);437 438 zfcp_erp_thread_kill(adapter);439 zfcp_dbf_adapter_unregister(adapter);440 zfcp_qdio_destroy(adapter->qdio);441 442 zfcp_ccw_adapter_put(adapter); /* final put to release */443 return ERR_PTR(-ENOMEM);444}445 446void zfcp_adapter_unregister(struct zfcp_adapter *adapter)447{448 struct ccw_device *cdev = adapter->ccw_device;449 450 cancel_delayed_work_sync(&adapter->scan_work);451 cancel_work_sync(&adapter->stat_work);452 cancel_work_sync(&adapter->ns_up_work);453 cancel_work_sync(&adapter->version_change_lost_work);454 zfcp_destroy_adapter_work_queue(adapter);455 456 zfcp_fc_wka_ports_force_offline(adapter->gs);457 zfcp_scsi_adapter_unregister(adapter);458 device_remove_groups(&cdev->dev, zfcp_sysfs_adapter_attr_groups);459 460 zfcp_erp_thread_kill(adapter);461 zfcp_dbf_adapter_unregister(adapter);462 zfcp_qdio_destroy(adapter->qdio);463 464 zfcp_ccw_adapter_put(adapter); /* final put to release */465}466 467/**468 * zfcp_adapter_release - remove the adapter from the resource list469 * @ref: pointer to struct kref470 * locks: adapter list write lock is assumed to be held by caller471 */472void zfcp_adapter_release(struct kref *ref)473{474 struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter,475 ref);476 struct ccw_device *cdev = adapter->ccw_device;477 478 dev_set_drvdata(&adapter->ccw_device->dev, NULL);479 zfcp_fc_gs_destroy(adapter);480 zfcp_free_low_mem_buffers(adapter);481 zfcp_diag_adapter_free(adapter);482 kfree(adapter->req_list);483 kfree(adapter->fc_stats);484 kfree(adapter->stats_reset_data);485 kfree(adapter);486 put_device(&cdev->dev);487}488 489static void zfcp_port_release(struct device *dev)490{491 struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);492 493 zfcp_ccw_adapter_put(port->adapter);494 kfree(port);495}496 497/**498 * zfcp_port_enqueue - enqueue port to port list of adapter499 * @adapter: adapter where remote port is added500 * @wwpn: WWPN of the remote port to be enqueued501 * @status: initial status for the port502 * @d_id: destination id of the remote port to be enqueued503 * Returns: pointer to enqueued port on success, ERR_PTR on error504 *505 * All port internal structures are set up and the sysfs entry is generated.506 * d_id is used to enqueue ports with a well known address like the Directory507 * Service for nameserver lookup.508 */509struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,510 u32 status, u32 d_id)511{512 struct zfcp_port *port;513 int retval = -ENOMEM;514 515 kref_get(&adapter->ref);516 517 port = zfcp_get_port_by_wwpn(adapter, wwpn);518 if (port) {519 put_device(&port->dev);520 retval = -EEXIST;521 goto err_put;522 }523 524 port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);525 if (!port)526 goto err_put;527 528 rwlock_init(&port->unit_list_lock);529 INIT_LIST_HEAD(&port->unit_list);530 atomic_set(&port->units, 0);531 532 INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);533 INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);534 INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);535 536 port->adapter = adapter;537 port->d_id = d_id;538 port->wwpn = wwpn;539 port->rport_task = RPORT_NONE;540 port->dev.parent = &adapter->ccw_device->dev;541 port->dev.groups = zfcp_port_attr_groups;542 port->dev.release = zfcp_port_release;543 544 port->erp_action.adapter = adapter;545 port->erp_action.port = port;546 547 if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {548 kfree(port);549 goto err_put;550 }551 retval = -EINVAL;552 553 if (device_register(&port->dev)) {554 put_device(&port->dev);555 goto err_out;556 }557 558 write_lock_irq(&adapter->port_list_lock);559 list_add_tail(&port->list, &adapter->port_list);560 write_unlock_irq(&adapter->port_list_lock);561 562 atomic_or(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);563 564 return port;565 566err_put:567 zfcp_ccw_adapter_put(adapter);568err_out:569 return ERR_PTR(retval);570}571