[SCSI] zfcp: Add zfcp private struct as SCSI device driver data
[linux-3.10.git] / 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 Corporation 2002, 2010
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  */
27
28 #define KMSG_COMPONENT "zfcp"
29 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
30
31 #include <linux/miscdevice.h>
32 #include <linux/seq_file.h>
33 #include <linux/slab.h>
34 #include "zfcp_ext.h"
35 #include "zfcp_fc.h"
36 #include "zfcp_reqlist.h"
37
38 #define ZFCP_BUS_ID_SIZE        20
39
40 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
41 MODULE_DESCRIPTION("FCP HBA driver");
42 MODULE_LICENSE("GPL");
43
44 static char *init_device;
45 module_param_named(device, init_device, charp, 0400);
46 MODULE_PARM_DESC(device, "specify initial device");
47
48 static struct kmem_cache *zfcp_cache_hw_align(const char *name,
49                                               unsigned long size)
50 {
51         return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL);
52 }
53
54 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
55 {
56         struct ccw_device *cdev;
57         struct zfcp_adapter *adapter;
58         struct zfcp_port *port;
59         struct zfcp_unit *unit;
60
61         cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
62         if (!cdev)
63                 return;
64
65         if (ccw_device_set_online(cdev))
66                 goto out_ccw_device;
67
68         adapter = zfcp_ccw_adapter_by_cdev(cdev);
69         if (!adapter)
70                 goto out_ccw_device;
71
72         port = zfcp_get_port_by_wwpn(adapter, wwpn);
73         if (!port)
74                 goto out_port;
75
76         flush_work(&port->rport_work);
77         unit = zfcp_unit_enqueue(port, lun);
78         if (IS_ERR(unit))
79                 goto out_unit;
80
81         zfcp_erp_unit_reopen(unit, 0, "auidc_1", NULL);
82         zfcp_erp_wait(adapter);
83         zfcp_scsi_scan(unit);
84
85 out_unit:
86         put_device(&port->dev);
87 out_port:
88         zfcp_ccw_adapter_put(adapter);
89 out_ccw_device:
90         put_device(&cdev->dev);
91         return;
92 }
93
94 static void __init zfcp_init_device_setup(char *devstr)
95 {
96         char *token;
97         char *str, *str_saved;
98         char busid[ZFCP_BUS_ID_SIZE];
99         u64 wwpn, lun;
100
101         /* duplicate devstr and keep the original for sysfs presentation*/
102         str_saved = kstrdup(devstr, GFP_KERNEL);
103         str = str_saved;
104         if (!str)
105                 return;
106
107         token = strsep(&str, ",");
108         if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
109                 goto err_out;
110         strncpy(busid, token, ZFCP_BUS_ID_SIZE);
111
112         token = strsep(&str, ",");
113         if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn))
114                 goto err_out;
115
116         token = strsep(&str, ",");
117         if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun))
118                 goto err_out;
119
120         kfree(str_saved);
121         zfcp_init_device_configure(busid, wwpn, lun);
122         return;
123
124 err_out:
125         kfree(str_saved);
126         pr_err("%s is not a valid SCSI device\n", devstr);
127 }
128
129 static int __init zfcp_module_init(void)
130 {
131         int retval = -ENOMEM;
132
133         zfcp_data.gpn_ft_cache = zfcp_cache_hw_align("zfcp_gpn",
134                                         sizeof(struct zfcp_fc_gpn_ft_req));
135         if (!zfcp_data.gpn_ft_cache)
136                 goto out;
137
138         zfcp_data.qtcb_cache = zfcp_cache_hw_align("zfcp_qtcb",
139                                         sizeof(struct fsf_qtcb));
140         if (!zfcp_data.qtcb_cache)
141                 goto out_qtcb_cache;
142
143         zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr",
144                                         sizeof(struct fsf_status_read_buffer));
145         if (!zfcp_data.sr_buffer_cache)
146                 goto out_sr_cache;
147
148         zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid",
149                                         sizeof(struct zfcp_fc_gid_pn));
150         if (!zfcp_data.gid_pn_cache)
151                 goto out_gid_cache;
152
153         zfcp_data.adisc_cache = zfcp_cache_hw_align("zfcp_adisc",
154                                         sizeof(struct zfcp_fc_els_adisc));
155         if (!zfcp_data.adisc_cache)
156                 goto out_adisc_cache;
157
158         zfcp_data.scsi_transport_template =
159                 fc_attach_transport(&zfcp_transport_functions);
160         if (!zfcp_data.scsi_transport_template)
161                 goto out_transport;
162         scsi_transport_reserve_device(zfcp_data.scsi_transport_template,
163                                       sizeof(struct zfcp_scsi_dev));
164
165
166         retval = misc_register(&zfcp_cfdc_misc);
167         if (retval) {
168                 pr_err("Registering the misc device zfcp_cfdc failed\n");
169                 goto out_misc;
170         }
171
172         retval = ccw_driver_register(&zfcp_ccw_driver);
173         if (retval) {
174                 pr_err("The zfcp device driver could not register with "
175                        "the common I/O layer\n");
176                 goto out_ccw_register;
177         }
178
179         if (init_device)
180                 zfcp_init_device_setup(init_device);
181         return 0;
182
183 out_ccw_register:
184         misc_deregister(&zfcp_cfdc_misc);
185 out_misc:
186         fc_release_transport(zfcp_data.scsi_transport_template);
187 out_transport:
188         kmem_cache_destroy(zfcp_data.adisc_cache);
189 out_adisc_cache:
190         kmem_cache_destroy(zfcp_data.gid_pn_cache);
191 out_gid_cache:
192         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
193 out_sr_cache:
194         kmem_cache_destroy(zfcp_data.qtcb_cache);
195 out_qtcb_cache:
196         kmem_cache_destroy(zfcp_data.gpn_ft_cache);
197 out:
198         return retval;
199 }
200
201 module_init(zfcp_module_init);
202
203 static void __exit zfcp_module_exit(void)
204 {
205         ccw_driver_unregister(&zfcp_ccw_driver);
206         misc_deregister(&zfcp_cfdc_misc);
207         fc_release_transport(zfcp_data.scsi_transport_template);
208         kmem_cache_destroy(zfcp_data.adisc_cache);
209         kmem_cache_destroy(zfcp_data.gid_pn_cache);
210         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
211         kmem_cache_destroy(zfcp_data.qtcb_cache);
212         kmem_cache_destroy(zfcp_data.gpn_ft_cache);
213 }
214
215 module_exit(zfcp_module_exit);
216
217 /**
218  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
219  * @port: pointer to port to search for unit
220  * @fcp_lun: FCP LUN to search for
221  *
222  * Returns: pointer to zfcp_unit or NULL
223  */
224 struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun)
225 {
226         unsigned long flags;
227         struct zfcp_unit *unit;
228
229         read_lock_irqsave(&port->unit_list_lock, flags);
230         list_for_each_entry(unit, &port->unit_list, list)
231                 if (unit->fcp_lun == fcp_lun) {
232                         if (!get_device(&unit->dev))
233                                 unit = NULL;
234                         read_unlock_irqrestore(&port->unit_list_lock, flags);
235                         return unit;
236                 }
237         read_unlock_irqrestore(&port->unit_list_lock, flags);
238         return NULL;
239 }
240
241 /**
242  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
243  * @adapter: pointer to adapter to search for port
244  * @wwpn: wwpn to search for
245  *
246  * Returns: pointer to zfcp_port or NULL
247  */
248 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
249                                         u64 wwpn)
250 {
251         unsigned long flags;
252         struct zfcp_port *port;
253
254         read_lock_irqsave(&adapter->port_list_lock, flags);
255         list_for_each_entry(port, &adapter->port_list, list)
256                 if (port->wwpn == wwpn) {
257                         if (!get_device(&port->dev))
258                                 port = NULL;
259                         read_unlock_irqrestore(&adapter->port_list_lock, flags);
260                         return port;
261                 }
262         read_unlock_irqrestore(&adapter->port_list_lock, flags);
263         return NULL;
264 }
265
266 /**
267  * zfcp_unit_release - dequeue unit
268  * @dev: pointer to device
269  *
270  * waits until all work is done on unit and removes it then from the unit->list
271  * of the associated port.
272  */
273 static void zfcp_unit_release(struct device *dev)
274 {
275         struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev);
276
277         put_device(&unit->port->dev);
278         kfree(unit);
279 }
280
281 /**
282  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
283  * @port: pointer to port where unit is added
284  * @fcp_lun: FCP LUN of unit to be enqueued
285  * Returns: pointer to enqueued unit on success, ERR_PTR on error
286  *
287  * Sets up some unit internal structures and creates sysfs entry.
288  */
289 struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun)
290 {
291         struct zfcp_unit *unit;
292         int retval = -ENOMEM;
293
294         get_device(&port->dev);
295
296         unit = zfcp_get_unit_by_lun(port, fcp_lun);
297         if (unit) {
298                 put_device(&unit->dev);
299                 retval = -EEXIST;
300                 goto err_out;
301         }
302
303         unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
304         if (!unit)
305                 goto err_out;
306
307         unit->port = port;
308         unit->fcp_lun = fcp_lun;
309         unit->dev.parent = &port->dev;
310         unit->dev.release = zfcp_unit_release;
311
312         if (dev_set_name(&unit->dev, "0x%016llx",
313                          (unsigned long long) fcp_lun)) {
314                 kfree(unit);
315                 goto err_out;
316         }
317         retval = -EINVAL;
318
319         INIT_WORK(&unit->scsi_work, zfcp_scsi_scan_work);
320
321         spin_lock_init(&unit->latencies.lock);
322         unit->latencies.write.channel.min = 0xFFFFFFFF;
323         unit->latencies.write.fabric.min = 0xFFFFFFFF;
324         unit->latencies.read.channel.min = 0xFFFFFFFF;
325         unit->latencies.read.fabric.min = 0xFFFFFFFF;
326         unit->latencies.cmd.channel.min = 0xFFFFFFFF;
327         unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
328
329         if (device_register(&unit->dev)) {
330                 put_device(&unit->dev);
331                 goto err_out;
332         }
333
334         if (sysfs_create_group(&unit->dev.kobj, &zfcp_sysfs_unit_attrs))
335                 goto err_out_put;
336
337         write_lock_irq(&port->unit_list_lock);
338         list_add_tail(&unit->list, &port->unit_list);
339         write_unlock_irq(&port->unit_list_lock);
340
341         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
342
343         return unit;
344
345 err_out_put:
346         device_unregister(&unit->dev);
347 err_out:
348         put_device(&port->dev);
349         return ERR_PTR(retval);
350 }
351
352 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
353 {
354         adapter->pool.erp_req =
355                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
356         if (!adapter->pool.erp_req)
357                 return -ENOMEM;
358
359         adapter->pool.gid_pn_req =
360                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
361         if (!adapter->pool.gid_pn_req)
362                 return -ENOMEM;
363
364         adapter->pool.scsi_req =
365                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
366         if (!adapter->pool.scsi_req)
367                 return -ENOMEM;
368
369         adapter->pool.scsi_abort =
370                 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
371         if (!adapter->pool.scsi_abort)
372                 return -ENOMEM;
373
374         adapter->pool.status_read_req =
375                 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
376                                             sizeof(struct zfcp_fsf_req));
377         if (!adapter->pool.status_read_req)
378                 return -ENOMEM;
379
380         adapter->pool.qtcb_pool =
381                 mempool_create_slab_pool(4, zfcp_data.qtcb_cache);
382         if (!adapter->pool.qtcb_pool)
383                 return -ENOMEM;
384
385         adapter->pool.status_read_data =
386                 mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
387                                          zfcp_data.sr_buffer_cache);
388         if (!adapter->pool.status_read_data)
389                 return -ENOMEM;
390
391         adapter->pool.gid_pn =
392                 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
393         if (!adapter->pool.gid_pn)
394                 return -ENOMEM;
395
396         return 0;
397 }
398
399 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
400 {
401         if (adapter->pool.erp_req)
402                 mempool_destroy(adapter->pool.erp_req);
403         if (adapter->pool.scsi_req)
404                 mempool_destroy(adapter->pool.scsi_req);
405         if (adapter->pool.scsi_abort)
406                 mempool_destroy(adapter->pool.scsi_abort);
407         if (adapter->pool.qtcb_pool)
408                 mempool_destroy(adapter->pool.qtcb_pool);
409         if (adapter->pool.status_read_req)
410                 mempool_destroy(adapter->pool.status_read_req);
411         if (adapter->pool.status_read_data)
412                 mempool_destroy(adapter->pool.status_read_data);
413         if (adapter->pool.gid_pn)
414                 mempool_destroy(adapter->pool.gid_pn);
415 }
416
417 /**
418  * zfcp_status_read_refill - refill the long running status_read_requests
419  * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
420  *
421  * Returns: 0 on success, 1 otherwise
422  *
423  * if there are 16 or more status_read requests missing an adapter_reopen
424  * is triggered
425  */
426 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
427 {
428         while (atomic_read(&adapter->stat_miss) > 0)
429                 if (zfcp_fsf_status_read(adapter->qdio)) {
430                         if (atomic_read(&adapter->stat_miss) >=
431                             adapter->stat_read_buf_num) {
432                                 zfcp_erp_adapter_reopen(adapter, 0, "axsref1",
433                                                         NULL);
434                                 return 1;
435                         }
436                         break;
437                 } else
438                         atomic_dec(&adapter->stat_miss);
439         return 0;
440 }
441
442 static void _zfcp_status_read_scheduler(struct work_struct *work)
443 {
444         zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
445                                              stat_work));
446 }
447
448 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
449 {
450         struct zfcp_adapter *adapter =
451                 container_of(sl, struct zfcp_adapter, service_level);
452
453         seq_printf(m, "zfcp: %s microcode level %x\n",
454                    dev_name(&adapter->ccw_device->dev),
455                    adapter->fsf_lic_version);
456 }
457
458 static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
459 {
460         char name[TASK_COMM_LEN];
461
462         snprintf(name, sizeof(name), "zfcp_q_%s",
463                  dev_name(&adapter->ccw_device->dev));
464         adapter->work_queue = create_singlethread_workqueue(name);
465
466         if (adapter->work_queue)
467                 return 0;
468         return -ENOMEM;
469 }
470
471 static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
472 {
473         if (adapter->work_queue)
474                 destroy_workqueue(adapter->work_queue);
475         adapter->work_queue = NULL;
476
477 }
478
479 /**
480  * zfcp_adapter_enqueue - enqueue a new adapter to the list
481  * @ccw_device: pointer to the struct cc_device
482  *
483  * Returns:     struct zfcp_adapter*
484  * Enqueues an adapter at the end of the adapter list in the driver data.
485  * All adapter internal structures are set up.
486  * Proc-fs entries are also created.
487  */
488 struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
489 {
490         struct zfcp_adapter *adapter;
491
492         if (!get_device(&ccw_device->dev))
493                 return ERR_PTR(-ENODEV);
494
495         adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
496         if (!adapter) {
497                 put_device(&ccw_device->dev);
498                 return ERR_PTR(-ENOMEM);
499         }
500
501         kref_init(&adapter->ref);
502
503         ccw_device->handler = NULL;
504         adapter->ccw_device = ccw_device;
505
506         INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
507         INIT_WORK(&adapter->scan_work, zfcp_fc_scan_ports);
508
509         if (zfcp_qdio_setup(adapter))
510                 goto failed;
511
512         if (zfcp_allocate_low_mem_buffers(adapter))
513                 goto failed;
514
515         adapter->req_list = zfcp_reqlist_alloc();
516         if (!adapter->req_list)
517                 goto failed;
518
519         if (zfcp_dbf_adapter_register(adapter))
520                 goto failed;
521
522         if (zfcp_setup_adapter_work_queue(adapter))
523                 goto failed;
524
525         if (zfcp_fc_gs_setup(adapter))
526                 goto failed;
527
528         rwlock_init(&adapter->port_list_lock);
529         INIT_LIST_HEAD(&adapter->port_list);
530
531         INIT_LIST_HEAD(&adapter->events.list);
532         INIT_WORK(&adapter->events.work, zfcp_fc_post_event);
533         spin_lock_init(&adapter->events.list_lock);
534
535         init_waitqueue_head(&adapter->erp_ready_wq);
536         init_waitqueue_head(&adapter->erp_done_wqh);
537
538         INIT_LIST_HEAD(&adapter->erp_ready_head);
539         INIT_LIST_HEAD(&adapter->erp_running_head);
540
541         rwlock_init(&adapter->erp_lock);
542         rwlock_init(&adapter->abort_lock);
543
544         if (zfcp_erp_thread_setup(adapter))
545                 goto failed;
546
547         adapter->service_level.seq_print = zfcp_print_sl;
548
549         dev_set_drvdata(&ccw_device->dev, adapter);
550
551         if (sysfs_create_group(&ccw_device->dev.kobj,
552                                &zfcp_sysfs_adapter_attrs))
553                 goto failed;
554
555         /* report size limit per scatter-gather segment */
556         adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN;
557         adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
558
559         if (!zfcp_adapter_scsi_register(adapter))
560                 return adapter;
561
562 failed:
563         zfcp_adapter_unregister(adapter);
564         return ERR_PTR(-ENOMEM);
565 }
566
567 void zfcp_adapter_unregister(struct zfcp_adapter *adapter)
568 {
569         struct ccw_device *cdev = adapter->ccw_device;
570
571         cancel_work_sync(&adapter->scan_work);
572         cancel_work_sync(&adapter->stat_work);
573         zfcp_destroy_adapter_work_queue(adapter);
574
575         zfcp_fc_wka_ports_force_offline(adapter->gs);
576         zfcp_adapter_scsi_unregister(adapter);
577         sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs);
578
579         zfcp_erp_thread_kill(adapter);
580         zfcp_dbf_adapter_unregister(adapter->dbf);
581         zfcp_qdio_destroy(adapter->qdio);
582
583         zfcp_ccw_adapter_put(adapter); /* final put to release */
584 }
585
586 /**
587  * zfcp_adapter_release - remove the adapter from the resource list
588  * @ref: pointer to struct kref
589  * locks:       adapter list write lock is assumed to be held by caller
590  */
591 void zfcp_adapter_release(struct kref *ref)
592 {
593         struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter,
594                                                     ref);
595         struct ccw_device *cdev = adapter->ccw_device;
596
597         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
598         zfcp_fc_gs_destroy(adapter);
599         zfcp_free_low_mem_buffers(adapter);
600         kfree(adapter->req_list);
601         kfree(adapter->fc_stats);
602         kfree(adapter->stats_reset_data);
603         kfree(adapter);
604         put_device(&cdev->dev);
605 }
606
607 /**
608  * zfcp_device_unregister - remove port, unit from system
609  * @dev: reference to device which is to be removed
610  * @grp: related reference to attribute group
611  *
612  * Helper function to unregister port, unit from system
613  */
614 void zfcp_device_unregister(struct device *dev,
615                             const struct attribute_group *grp)
616 {
617         sysfs_remove_group(&dev->kobj, grp);
618         device_unregister(dev);
619 }
620
621 static void zfcp_port_release(struct device *dev)
622 {
623         struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
624
625         zfcp_ccw_adapter_put(port->adapter);
626         kfree(port);
627 }
628
629 /**
630  * zfcp_port_enqueue - enqueue port to port list of adapter
631  * @adapter: adapter where remote port is added
632  * @wwpn: WWPN of the remote port to be enqueued
633  * @status: initial status for the port
634  * @d_id: destination id of the remote port to be enqueued
635  * Returns: pointer to enqueued port on success, ERR_PTR on error
636  *
637  * All port internal structures are set up and the sysfs entry is generated.
638  * d_id is used to enqueue ports with a well known address like the Directory
639  * Service for nameserver lookup.
640  */
641 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
642                                      u32 status, u32 d_id)
643 {
644         struct zfcp_port *port;
645         int retval = -ENOMEM;
646
647         kref_get(&adapter->ref);
648
649         port = zfcp_get_port_by_wwpn(adapter, wwpn);
650         if (port) {
651                 put_device(&port->dev);
652                 retval = -EEXIST;
653                 goto err_out;
654         }
655
656         port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
657         if (!port)
658                 goto err_out;
659
660         rwlock_init(&port->unit_list_lock);
661         INIT_LIST_HEAD(&port->unit_list);
662
663         INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
664         INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
665         INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
666
667         port->adapter = adapter;
668         port->d_id = d_id;
669         port->wwpn = wwpn;
670         port->rport_task = RPORT_NONE;
671         port->dev.parent = &adapter->ccw_device->dev;
672         port->dev.release = zfcp_port_release;
673
674         if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
675                 kfree(port);
676                 goto err_out;
677         }
678         retval = -EINVAL;
679
680         if (device_register(&port->dev)) {
681                 put_device(&port->dev);
682                 goto err_out;
683         }
684
685         if (sysfs_create_group(&port->dev.kobj,
686                                &zfcp_sysfs_port_attrs))
687                 goto err_out_put;
688
689         write_lock_irq(&adapter->port_list_lock);
690         list_add_tail(&port->list, &adapter->port_list);
691         write_unlock_irq(&adapter->port_list_lock);
692
693         atomic_set_mask(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);
694
695         return port;
696
697 err_out_put:
698         device_unregister(&port->dev);
699 err_out:
700         zfcp_ccw_adapter_put(adapter);
701         return ERR_PTR(retval);
702 }
703
704 /**
705  * zfcp_sg_free_table - free memory used by scatterlists
706  * @sg: pointer to scatterlist
707  * @count: number of scatterlist which are to be free'ed
708  * the scatterlist are expected to reference pages always
709  */
710 void zfcp_sg_free_table(struct scatterlist *sg, int count)
711 {
712         int i;
713
714         for (i = 0; i < count; i++, sg++)
715                 if (sg)
716                         free_page((unsigned long) sg_virt(sg));
717                 else
718                         break;
719 }
720
721 /**
722  * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
723  * @sg: pointer to struct scatterlist
724  * @count: number of scatterlists which should be assigned with buffers
725  * of size page
726  *
727  * Returns: 0 on success, -ENOMEM otherwise
728  */
729 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
730 {
731         void *addr;
732         int i;
733
734         sg_init_table(sg, count);
735         for (i = 0; i < count; i++, sg++) {
736                 addr = (void *) get_zeroed_page(GFP_KERNEL);
737                 if (!addr) {
738                         zfcp_sg_free_table(sg, i);
739                         return -ENOMEM;
740                 }
741                 sg_set_buf(sg, addr, PAGE_SIZE);
742         }
743         return 0;
744 }