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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * zfcp device driver
0004  *
0005  * Module interface and handling of zfcp data structures.
0006  *
0007  * Copyright IBM Corp. 2002, 2020
0008  */
0009 
0010 /*
0011  * Driver authors:
0012  *            Martin Peschke (originator of the driver)
0013  *            Raimund Schroeder
0014  *            Aron Zeh
0015  *            Wolfgang Taphorn
0016  *            Stefan Bader
0017  *            Heiko Carstens (kernel 2.6 port of the driver)
0018  *            Andreas Herrmann
0019  *            Maxim Shchetynin
0020  *            Volker Sameske
0021  *            Ralph Wuerthner
0022  *            Michael Loehr
0023  *            Swen Schillig
0024  *            Christof Schmitt
0025  *            Martin Petermann
0026  *            Sven Schuetz
0027  *            Steffen Maier
0028  *        Benjamin Block
0029  */
0030 
0031 #define KMSG_COMPONENT "zfcp"
0032 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
0033 
0034 #include <linux/seq_file.h>
0035 #include <linux/slab.h>
0036 #include <linux/module.h>
0037 #include "zfcp_ext.h"
0038 #include "zfcp_fc.h"
0039 #include "zfcp_reqlist.h"
0040 #include "zfcp_diag.h"
0041 
0042 #define ZFCP_BUS_ID_SIZE    20
0043 
0044 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
0045 MODULE_DESCRIPTION("FCP HBA driver");
0046 MODULE_LICENSE("GPL");
0047 
0048 static char *init_device;
0049 module_param_named(device, init_device, charp, 0400);
0050 MODULE_PARM_DESC(device, "specify initial device");
0051 
0052 static struct kmem_cache * __init zfcp_cache_hw_align(const char *name,
0053                               unsigned long size)
0054 {
0055     return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL);
0056 }
0057 
0058 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
0059 {
0060     struct ccw_device *cdev;
0061     struct zfcp_adapter *adapter;
0062     struct zfcp_port *port;
0063 
0064     cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
0065     if (!cdev)
0066         return;
0067 
0068     if (ccw_device_set_online(cdev))
0069         goto out_ccw_device;
0070 
0071     adapter = zfcp_ccw_adapter_by_cdev(cdev);
0072     if (!adapter)
0073         goto out_ccw_device;
0074 
0075     port = zfcp_get_port_by_wwpn(adapter, wwpn);
0076     if (!port)
0077         goto out_port;
0078     flush_work(&port->rport_work);
0079 
0080     zfcp_unit_add(port, lun);
0081     put_device(&port->dev);
0082 
0083 out_port:
0084     zfcp_ccw_adapter_put(adapter);
0085 out_ccw_device:
0086     put_device(&cdev->dev);
0087     return;
0088 }
0089 
0090 static void __init zfcp_init_device_setup(char *devstr)
0091 {
0092     char *token;
0093     char *str, *str_saved;
0094     char busid[ZFCP_BUS_ID_SIZE];
0095     u64 wwpn, lun;
0096 
0097     /* duplicate devstr and keep the original for sysfs presentation*/
0098     str_saved = kstrdup(devstr, GFP_KERNEL);
0099     str = str_saved;
0100     if (!str)
0101         return;
0102 
0103     token = strsep(&str, ",");
0104     if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
0105         goto err_out;
0106     strlcpy(busid, token, ZFCP_BUS_ID_SIZE);
0107 
0108     token = strsep(&str, ",");
0109     if (!token || kstrtoull(token, 0, (unsigned long long *) &wwpn))
0110         goto err_out;
0111 
0112     token = strsep(&str, ",");
0113     if (!token || kstrtoull(token, 0, (unsigned long long *) &lun))
0114         goto err_out;
0115 
0116     kfree(str_saved);
0117     zfcp_init_device_configure(busid, wwpn, lun);
0118     return;
0119 
0120 err_out:
0121     kfree(str_saved);
0122     pr_err("%s is not a valid SCSI device\n", devstr);
0123 }
0124 
0125 static int __init zfcp_module_init(void)
0126 {
0127     int retval = -ENOMEM;
0128 
0129     if (zfcp_experimental_dix)
0130         pr_warn("DIX is enabled. It is experimental and might cause problems\n");
0131 
0132     zfcp_fsf_qtcb_cache = zfcp_cache_hw_align("zfcp_fsf_qtcb",
0133                           sizeof(struct fsf_qtcb));
0134     if (!zfcp_fsf_qtcb_cache)
0135         goto out_qtcb_cache;
0136 
0137     zfcp_fc_req_cache = zfcp_cache_hw_align("zfcp_fc_req",
0138                         sizeof(struct zfcp_fc_req));
0139     if (!zfcp_fc_req_cache)
0140         goto out_fc_cache;
0141 
0142     zfcp_scsi_transport_template =
0143         fc_attach_transport(&zfcp_transport_functions);
0144     if (!zfcp_scsi_transport_template)
0145         goto out_transport;
0146     scsi_transport_reserve_device(zfcp_scsi_transport_template,
0147                       sizeof(struct zfcp_scsi_dev));
0148 
0149     retval = ccw_driver_register(&zfcp_ccw_driver);
0150     if (retval) {
0151         pr_err("The zfcp device driver could not register with "
0152                "the common I/O layer\n");
0153         goto out_ccw_register;
0154     }
0155 
0156     if (init_device)
0157         zfcp_init_device_setup(init_device);
0158     return 0;
0159 
0160 out_ccw_register:
0161     fc_release_transport(zfcp_scsi_transport_template);
0162 out_transport:
0163     kmem_cache_destroy(zfcp_fc_req_cache);
0164 out_fc_cache:
0165     kmem_cache_destroy(zfcp_fsf_qtcb_cache);
0166 out_qtcb_cache:
0167     return retval;
0168 }
0169 
0170 module_init(zfcp_module_init);
0171 
0172 static void __exit zfcp_module_exit(void)
0173 {
0174     ccw_driver_unregister(&zfcp_ccw_driver);
0175     fc_release_transport(zfcp_scsi_transport_template);
0176     kmem_cache_destroy(zfcp_fc_req_cache);
0177     kmem_cache_destroy(zfcp_fsf_qtcb_cache);
0178 }
0179 
0180 module_exit(zfcp_module_exit);
0181 
0182 /**
0183  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
0184  * @adapter: pointer to adapter to search for port
0185  * @wwpn: wwpn to search for
0186  *
0187  * Returns: pointer to zfcp_port or NULL
0188  */
0189 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
0190                     u64 wwpn)
0191 {
0192     unsigned long flags;
0193     struct zfcp_port *port;
0194 
0195     read_lock_irqsave(&adapter->port_list_lock, flags);
0196     list_for_each_entry(port, &adapter->port_list, list)
0197         if (port->wwpn == wwpn) {
0198             if (!get_device(&port->dev))
0199                 port = NULL;
0200             read_unlock_irqrestore(&adapter->port_list_lock, flags);
0201             return port;
0202         }
0203     read_unlock_irqrestore(&adapter->port_list_lock, flags);
0204     return NULL;
0205 }
0206 
0207 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
0208 {
0209     adapter->pool.erp_req =
0210         mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
0211     if (!adapter->pool.erp_req)
0212         return -ENOMEM;
0213 
0214     adapter->pool.gid_pn_req =
0215         mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
0216     if (!adapter->pool.gid_pn_req)
0217         return -ENOMEM;
0218 
0219     adapter->pool.scsi_req =
0220         mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
0221     if (!adapter->pool.scsi_req)
0222         return -ENOMEM;
0223 
0224     adapter->pool.scsi_abort =
0225         mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
0226     if (!adapter->pool.scsi_abort)
0227         return -ENOMEM;
0228 
0229     adapter->pool.status_read_req =
0230         mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
0231                         sizeof(struct zfcp_fsf_req));
0232     if (!adapter->pool.status_read_req)
0233         return -ENOMEM;
0234 
0235     adapter->pool.qtcb_pool =
0236         mempool_create_slab_pool(4, zfcp_fsf_qtcb_cache);
0237     if (!adapter->pool.qtcb_pool)
0238         return -ENOMEM;
0239 
0240     BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE);
0241     adapter->pool.sr_data =
0242         mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0);
0243     if (!adapter->pool.sr_data)
0244         return -ENOMEM;
0245 
0246     adapter->pool.gid_pn =
0247         mempool_create_slab_pool(1, zfcp_fc_req_cache);
0248     if (!adapter->pool.gid_pn)
0249         return -ENOMEM;
0250 
0251     return 0;
0252 }
0253 
0254 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
0255 {
0256     mempool_destroy(adapter->pool.erp_req);
0257     mempool_destroy(adapter->pool.scsi_req);
0258     mempool_destroy(adapter->pool.scsi_abort);
0259     mempool_destroy(adapter->pool.qtcb_pool);
0260     mempool_destroy(adapter->pool.status_read_req);
0261     mempool_destroy(adapter->pool.sr_data);
0262     mempool_destroy(adapter->pool.gid_pn);
0263 }
0264 
0265 /**
0266  * zfcp_status_read_refill - refill the long running status_read_requests
0267  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
0268  *
0269  * Return:
0270  * * 0 on success meaning at least one status read is pending
0271  * * 1 if posting failed and not a single status read buffer is pending,
0272  *     also triggers adapter reopen recovery
0273  */
0274 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
0275 {
0276     while (atomic_add_unless(&adapter->stat_miss, -1, 0))
0277         if (zfcp_fsf_status_read(adapter->qdio)) {
0278             atomic_inc(&adapter->stat_miss); /* undo add -1 */
0279             if (atomic_read(&adapter->stat_miss) >=
0280                 adapter->stat_read_buf_num) {
0281                 zfcp_erp_adapter_reopen(adapter, 0, "axsref1");
0282                 return 1;
0283             }
0284             break;
0285         }
0286     return 0;
0287 }
0288 
0289 static void _zfcp_status_read_scheduler(struct work_struct *work)
0290 {
0291     zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
0292                          stat_work));
0293 }
0294 
0295 static void zfcp_version_change_lost_work(struct work_struct *work)
0296 {
0297     struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
0298                             version_change_lost_work);
0299 
0300     zfcp_fsf_exchange_config_data_sync(adapter->qdio, NULL);
0301 }
0302 
0303 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
0304 {
0305     struct zfcp_adapter *adapter =
0306         container_of(sl, struct zfcp_adapter, service_level);
0307 
0308     seq_printf(m, "zfcp: %s microcode level %x\n",
0309            dev_name(&adapter->ccw_device->dev),
0310            adapter->fsf_lic_version);
0311 }
0312 
0313 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
0314 {
0315     char name[TASK_COMM_LEN];
0316 
0317     snprintf(name, sizeof(name), "zfcp_q_%s",
0318          dev_name(&adapter->ccw_device->dev));
0319     adapter->work_queue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
0320 
0321     if (adapter->work_queue)
0322         return 0;
0323     return -ENOMEM;
0324 }
0325 
0326 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
0327 {
0328     if (adapter->work_queue)
0329         destroy_workqueue(adapter->work_queue);
0330     adapter->work_queue = NULL;
0331 
0332 }
0333 
0334 /**
0335  * zfcp_adapter_enqueue - enqueue a new adapter to the list
0336  * @ccw_device: pointer to the struct cc_device
0337  *
0338  * Returns: struct zfcp_adapter*
0339  * Enqueues an adapter at the end of the adapter list in the driver data.
0340  * All adapter internal structures are set up.
0341  * Proc-fs entries are also created.
0342  */
0343 struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
0344 {
0345     struct zfcp_adapter *adapter;
0346 
0347     if (!get_device(&ccw_device->dev))
0348         return ERR_PTR(-ENODEV);
0349 
0350     adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
0351     if (!adapter) {
0352         put_device(&ccw_device->dev);
0353         return ERR_PTR(-ENOMEM);
0354     }
0355 
0356     kref_init(&adapter->ref);
0357 
0358     ccw_device->handler = NULL;
0359     adapter->ccw_device = ccw_device;
0360 
0361     INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
0362     INIT_DELAYED_WORK(&adapter->scan_work, zfcp_fc_scan_ports);
0363     INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update);
0364     INIT_WORK(&adapter->version_change_lost_work,
0365           zfcp_version_change_lost_work);
0366 
0367     adapter->next_port_scan = jiffies;
0368 
0369     adapter->erp_action.adapter = adapter;
0370 
0371     if (zfcp_diag_adapter_setup(adapter))
0372         goto failed;
0373 
0374     if (zfcp_qdio_setup(adapter))
0375         goto failed;
0376 
0377     if (zfcp_allocate_low_mem_buffers(adapter))
0378         goto failed;
0379 
0380     adapter->req_list = zfcp_reqlist_alloc();
0381     if (!adapter->req_list)
0382         goto failed;
0383 
0384     if (zfcp_dbf_adapter_register(adapter))
0385         goto failed;
0386 
0387     if (zfcp_setup_adapter_work_queue(adapter))
0388         goto failed;
0389 
0390     if (zfcp_fc_gs_setup(adapter))
0391         goto failed;
0392 
0393     rwlock_init(&adapter->port_list_lock);
0394     INIT_LIST_HEAD(&adapter->port_list);
0395 
0396     INIT_LIST_HEAD(&adapter->events.list);
0397     INIT_WORK(&adapter->events.work, zfcp_fc_post_event);
0398     spin_lock_init(&adapter->events.list_lock);
0399 
0400     init_waitqueue_head(&adapter->erp_ready_wq);
0401     init_waitqueue_head(&adapter->erp_done_wqh);
0402 
0403     INIT_LIST_HEAD(&adapter->erp_ready_head);
0404     INIT_LIST_HEAD(&adapter->erp_running_head);
0405 
0406     rwlock_init(&adapter->erp_lock);
0407     rwlock_init(&adapter->abort_lock);
0408 
0409     if (zfcp_erp_thread_setup(adapter))
0410         goto failed;
0411 
0412     adapter->service_level.seq_print = zfcp_print_sl;
0413 
0414     dev_set_drvdata(&ccw_device->dev, adapter);
0415 
0416     if (device_add_groups(&ccw_device->dev, zfcp_sysfs_adapter_attr_groups))
0417         goto err_sysfs;
0418 
0419     /* report size limit per scatter-gather segment */
0420     adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
0421 
0422     adapter->stat_read_buf_num = FSF_STATUS_READS_RECOM;
0423 
0424     return adapter;
0425 
0426 err_sysfs:
0427 failed:
0428     /* TODO: make this more fine-granular */
0429     cancel_delayed_work_sync(&adapter->scan_work);
0430     cancel_work_sync(&adapter->stat_work);
0431     cancel_work_sync(&adapter->ns_up_work);
0432     cancel_work_sync(&adapter->version_change_lost_work);
0433     zfcp_destroy_adapter_work_queue(adapter);
0434 
0435     zfcp_fc_wka_ports_force_offline(adapter->gs);
0436     zfcp_scsi_adapter_unregister(adapter);
0437 
0438     zfcp_erp_thread_kill(adapter);
0439     zfcp_dbf_adapter_unregister(adapter);
0440     zfcp_qdio_destroy(adapter->qdio);
0441 
0442     zfcp_ccw_adapter_put(adapter); /* final put to release */
0443     return ERR_PTR(-ENOMEM);
0444 }
0445 
0446 void zfcp_adapter_unregister(struct zfcp_adapter *adapter)
0447 {
0448     struct ccw_device *cdev = adapter->ccw_device;
0449 
0450     cancel_delayed_work_sync(&adapter->scan_work);
0451     cancel_work_sync(&adapter->stat_work);
0452     cancel_work_sync(&adapter->ns_up_work);
0453     cancel_work_sync(&adapter->version_change_lost_work);
0454     zfcp_destroy_adapter_work_queue(adapter);
0455 
0456     zfcp_fc_wka_ports_force_offline(adapter->gs);
0457     zfcp_scsi_adapter_unregister(adapter);
0458     device_remove_groups(&cdev->dev, zfcp_sysfs_adapter_attr_groups);
0459 
0460     zfcp_erp_thread_kill(adapter);
0461     zfcp_dbf_adapter_unregister(adapter);
0462     zfcp_qdio_destroy(adapter->qdio);
0463 
0464     zfcp_ccw_adapter_put(adapter); /* final put to release */
0465 }
0466 
0467 /**
0468  * zfcp_adapter_release - remove the adapter from the resource list
0469  * @ref: pointer to struct kref
0470  * locks:   adapter list write lock is assumed to be held by caller
0471  */
0472 void zfcp_adapter_release(struct kref *ref)
0473 {
0474     struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter,
0475                             ref);
0476     struct ccw_device *cdev = adapter->ccw_device;
0477 
0478     dev_set_drvdata(&adapter->ccw_device->dev, NULL);
0479     zfcp_fc_gs_destroy(adapter);
0480     zfcp_free_low_mem_buffers(adapter);
0481     zfcp_diag_adapter_free(adapter);
0482     kfree(adapter->req_list);
0483     kfree(adapter->fc_stats);
0484     kfree(adapter->stats_reset_data);
0485     kfree(adapter);
0486     put_device(&cdev->dev);
0487 }
0488 
0489 static void zfcp_port_release(struct device *dev)
0490 {
0491     struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
0492 
0493     zfcp_ccw_adapter_put(port->adapter);
0494     kfree(port);
0495 }
0496 
0497 /**
0498  * zfcp_port_enqueue - enqueue port to port list of adapter
0499  * @adapter: adapter where remote port is added
0500  * @wwpn: WWPN of the remote port to be enqueued
0501  * @status: initial status for the port
0502  * @d_id: destination id of the remote port to be enqueued
0503  * Returns: pointer to enqueued port on success, ERR_PTR on error
0504  *
0505  * All port internal structures are set up and the sysfs entry is generated.
0506  * d_id is used to enqueue ports with a well known address like the Directory
0507  * Service for nameserver lookup.
0508  */
0509 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
0510                      u32 status, u32 d_id)
0511 {
0512     struct zfcp_port *port;
0513     int retval = -ENOMEM;
0514 
0515     kref_get(&adapter->ref);
0516 
0517     port = zfcp_get_port_by_wwpn(adapter, wwpn);
0518     if (port) {
0519         put_device(&port->dev);
0520         retval = -EEXIST;
0521         goto err_out;
0522     }
0523 
0524     port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
0525     if (!port)
0526         goto err_out;
0527 
0528     rwlock_init(&port->unit_list_lock);
0529     INIT_LIST_HEAD(&port->unit_list);
0530     atomic_set(&port->units, 0);
0531 
0532     INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
0533     INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
0534     INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
0535 
0536     port->adapter = adapter;
0537     port->d_id = d_id;
0538     port->wwpn = wwpn;
0539     port->rport_task = RPORT_NONE;
0540     port->dev.parent = &adapter->ccw_device->dev;
0541     port->dev.groups = zfcp_port_attr_groups;
0542     port->dev.release = zfcp_port_release;
0543 
0544     port->erp_action.adapter = adapter;
0545     port->erp_action.port = port;
0546 
0547     if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
0548         kfree(port);
0549         goto err_out;
0550     }
0551     retval = -EINVAL;
0552 
0553     if (device_register(&port->dev)) {
0554         put_device(&port->dev);
0555         goto err_out;
0556     }
0557 
0558     write_lock_irq(&adapter->port_list_lock);
0559     list_add_tail(&port->list, &adapter->port_list);
0560     write_unlock_irq(&adapter->port_list_lock);
0561 
0562     atomic_or(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);
0563 
0564     return port;
0565 
0566 err_out:
0567     zfcp_ccw_adapter_put(adapter);
0568     return ERR_PTR(retval);
0569 }
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