1 /*
2 * zfcp device driver
3 *
4 * Module interface and handling of zfcp data structures.
5 *
6 * Copyright IBM Corporation 2002, 2008
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 "zfcp_ext.h"
34
35 #define ZFCP_BUS_ID_SIZE 20
36
37 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
38 MODULE_DESCRIPTION("FCP HBA driver");
39 MODULE_LICENSE("GPL");
40
41 static char *init_device;
42 module_param_named(device, init_device, charp, 0400);
43 MODULE_PARM_DESC(device, "specify initial device");
44
zfcp_reqlist_alloc(struct zfcp_adapter * adapter)45 static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
46 {
47 int idx;
48
49 adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
50 GFP_KERNEL);
51 if (!adapter->req_list)
52 return -ENOMEM;
53
54 for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
55 INIT_LIST_HEAD(&adapter->req_list[idx]);
56 return 0;
57 }
58
59 /**
60 * zfcp_reqlist_isempty - is the request list empty
61 * @adapter: pointer to struct zfcp_adapter
62 *
63 * Returns: true if list is empty, false otherwise
64 */
zfcp_reqlist_isempty(struct zfcp_adapter * adapter)65 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
66 {
67 unsigned int idx;
68
69 for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
70 if (!list_empty(&adapter->req_list[idx]))
71 return 0;
72 return 1;
73 }
74
zfcp_init_device_configure(char * busid,u64 wwpn,u64 lun)75 static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
76 {
77 struct zfcp_adapter *adapter;
78 struct zfcp_port *port;
79 struct zfcp_unit *unit;
80
81 down(&zfcp_data.config_sema);
82 read_lock_irq(&zfcp_data.config_lock);
83 adapter = zfcp_get_adapter_by_busid(busid);
84 if (adapter)
85 zfcp_adapter_get(adapter);
86 read_unlock_irq(&zfcp_data.config_lock);
87
88 if (!adapter)
89 goto out_adapter;
90 port = zfcp_port_enqueue(adapter, wwpn, 0, 0);
91 if (IS_ERR(port))
92 goto out_port;
93 unit = zfcp_unit_enqueue(port, lun);
94 if (IS_ERR(unit))
95 goto out_unit;
96 up(&zfcp_data.config_sema);
97 ccw_device_set_online(adapter->ccw_device);
98
99 zfcp_erp_wait(adapter);
100 wait_event(adapter->erp_done_wqh,
101 !(atomic_read(&unit->status) &
102 ZFCP_STATUS_UNIT_SCSI_WORK_PENDING));
103
104 down(&zfcp_data.config_sema);
105 zfcp_unit_put(unit);
106 out_unit:
107 zfcp_port_put(port);
108 out_port:
109 zfcp_adapter_put(adapter);
110 out_adapter:
111 up(&zfcp_data.config_sema);
112 return;
113 }
114
zfcp_cache_create(int size,char * name)115 static struct kmem_cache *zfcp_cache_create(int size, char *name)
116 {
117 int align = 1;
118 while ((size - align) > 0)
119 align <<= 1;
120 return kmem_cache_create(name , size, align, 0, NULL);
121 }
122
zfcp_init_device_setup(char * devstr)123 static void __init zfcp_init_device_setup(char *devstr)
124 {
125 char *token;
126 char *str;
127 char busid[ZFCP_BUS_ID_SIZE];
128 u64 wwpn, lun;
129
130 /* duplicate devstr and keep the original for sysfs presentation*/
131 str = kmalloc(strlen(devstr) + 1, GFP_KERNEL);
132 if (!str)
133 return;
134
135 strcpy(str, devstr);
136
137 token = strsep(&str, ",");
138 if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
139 goto err_out;
140 strncpy(busid, token, ZFCP_BUS_ID_SIZE);
141
142 token = strsep(&str, ",");
143 if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn))
144 goto err_out;
145
146 token = strsep(&str, ",");
147 if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun))
148 goto err_out;
149
150 kfree(str);
151 zfcp_init_device_configure(busid, wwpn, lun);
152 return;
153
154 err_out:
155 kfree(str);
156 pr_err("%s is not a valid SCSI device\n", devstr);
157 }
158
zfcp_module_init(void)159 static int __init zfcp_module_init(void)
160 {
161 int retval = -ENOMEM;
162
163 zfcp_data.fsf_req_qtcb_cache = zfcp_cache_create(
164 sizeof(struct zfcp_fsf_req_qtcb), "zfcp_fsf");
165 if (!zfcp_data.fsf_req_qtcb_cache)
166 goto out;
167
168 zfcp_data.sr_buffer_cache = zfcp_cache_create(
169 sizeof(struct fsf_status_read_buffer), "zfcp_sr");
170 if (!zfcp_data.sr_buffer_cache)
171 goto out_sr_cache;
172
173 zfcp_data.gid_pn_cache = zfcp_cache_create(
174 sizeof(struct zfcp_gid_pn_data), "zfcp_gid");
175 if (!zfcp_data.gid_pn_cache)
176 goto out_gid_cache;
177
178 zfcp_data.work_queue = create_singlethread_workqueue("zfcp_wq");
179
180 sema_init(&zfcp_data.config_sema, 1);
181 rwlock_init(&zfcp_data.config_lock);
182
183 zfcp_data.scsi_transport_template =
184 fc_attach_transport(&zfcp_transport_functions);
185 if (!zfcp_data.scsi_transport_template)
186 goto out_transport;
187
188 retval = misc_register(&zfcp_cfdc_misc);
189 if (retval) {
190 pr_err("Registering the misc device zfcp_cfdc failed\n");
191 goto out_misc;
192 }
193
194 retval = zfcp_ccw_register();
195 if (retval) {
196 pr_err("The zfcp device driver could not register with "
197 "the common I/O layer\n");
198 goto out_ccw_register;
199 }
200
201 if (init_device)
202 zfcp_init_device_setup(init_device);
203 return 0;
204
205 out_ccw_register:
206 misc_deregister(&zfcp_cfdc_misc);
207 out_misc:
208 fc_release_transport(zfcp_data.scsi_transport_template);
209 out_transport:
210 kmem_cache_destroy(zfcp_data.gid_pn_cache);
211 out_gid_cache:
212 kmem_cache_destroy(zfcp_data.sr_buffer_cache);
213 out_sr_cache:
214 kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
215 out:
216 return retval;
217 }
218
219 module_init(zfcp_module_init);
220
221 /**
222 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
223 * @port: pointer to port to search for unit
224 * @fcp_lun: FCP LUN to search for
225 *
226 * Returns: pointer to zfcp_unit or NULL
227 */
zfcp_get_unit_by_lun(struct zfcp_port * port,u64 fcp_lun)228 struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun)
229 {
230 struct zfcp_unit *unit;
231
232 list_for_each_entry(unit, &port->unit_list_head, list)
233 if ((unit->fcp_lun == fcp_lun) &&
234 !(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE))
235 return unit;
236 return NULL;
237 }
238
239 /**
240 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
241 * @adapter: pointer to adapter to search for port
242 * @wwpn: wwpn to search for
243 *
244 * Returns: pointer to zfcp_port or NULL
245 */
zfcp_get_port_by_wwpn(struct zfcp_adapter * adapter,u64 wwpn)246 struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
247 u64 wwpn)
248 {
249 struct zfcp_port *port;
250
251 list_for_each_entry(port, &adapter->port_list_head, list)
252 if ((port->wwpn == wwpn) && !(atomic_read(&port->status) &
253 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE)))
254 return port;
255 return NULL;
256 }
257
zfcp_sysfs_unit_release(struct device * dev)258 static void zfcp_sysfs_unit_release(struct device *dev)
259 {
260 kfree(container_of(dev, struct zfcp_unit, sysfs_device));
261 }
262
263 /**
264 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
265 * @port: pointer to port where unit is added
266 * @fcp_lun: FCP LUN of unit to be enqueued
267 * Returns: pointer to enqueued unit on success, ERR_PTR on error
268 * Locks: config_sema must be held to serialize changes to the unit list
269 *
270 * Sets up some unit internal structures and creates sysfs entry.
271 */
zfcp_unit_enqueue(struct zfcp_port * port,u64 fcp_lun)272 struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun)
273 {
274 struct zfcp_unit *unit;
275
276 unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
277 if (!unit)
278 return ERR_PTR(-ENOMEM);
279
280 atomic_set(&unit->refcount, 0);
281 init_waitqueue_head(&unit->remove_wq);
282
283 unit->port = port;
284 unit->fcp_lun = fcp_lun;
285
286 dev_set_name(&unit->sysfs_device, "0x%016llx",
287 (unsigned long long) fcp_lun);
288 unit->sysfs_device.parent = &port->sysfs_device;
289 unit->sysfs_device.release = zfcp_sysfs_unit_release;
290 dev_set_drvdata(&unit->sysfs_device, unit);
291
292 /* mark unit unusable as long as sysfs registration is not complete */
293 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
294
295 spin_lock_init(&unit->latencies.lock);
296 unit->latencies.write.channel.min = 0xFFFFFFFF;
297 unit->latencies.write.fabric.min = 0xFFFFFFFF;
298 unit->latencies.read.channel.min = 0xFFFFFFFF;
299 unit->latencies.read.fabric.min = 0xFFFFFFFF;
300 unit->latencies.cmd.channel.min = 0xFFFFFFFF;
301 unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
302
303 read_lock_irq(&zfcp_data.config_lock);
304 if (zfcp_get_unit_by_lun(port, fcp_lun)) {
305 read_unlock_irq(&zfcp_data.config_lock);
306 goto err_out_free;
307 }
308 read_unlock_irq(&zfcp_data.config_lock);
309
310 if (device_register(&unit->sysfs_device))
311 goto err_out_free;
312
313 if (sysfs_create_group(&unit->sysfs_device.kobj,
314 &zfcp_sysfs_unit_attrs)) {
315 device_unregister(&unit->sysfs_device);
316 return ERR_PTR(-EIO);
317 }
318
319 zfcp_unit_get(unit);
320
321 write_lock_irq(&zfcp_data.config_lock);
322 list_add_tail(&unit->list, &port->unit_list_head);
323 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
324 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
325
326 write_unlock_irq(&zfcp_data.config_lock);
327
328 zfcp_port_get(port);
329
330 return unit;
331
332 err_out_free:
333 kfree(unit);
334 return ERR_PTR(-EINVAL);
335 }
336
337 /**
338 * zfcp_unit_dequeue - dequeue unit
339 * @unit: pointer to zfcp_unit
340 *
341 * waits until all work is done on unit and removes it then from the unit->list
342 * of the associated port.
343 */
zfcp_unit_dequeue(struct zfcp_unit * unit)344 void zfcp_unit_dequeue(struct zfcp_unit *unit)
345 {
346 wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
347 write_lock_irq(&zfcp_data.config_lock);
348 list_del(&unit->list);
349 write_unlock_irq(&zfcp_data.config_lock);
350 zfcp_port_put(unit->port);
351 sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs);
352 device_unregister(&unit->sysfs_device);
353 }
354
zfcp_allocate_low_mem_buffers(struct zfcp_adapter * adapter)355 static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
356 {
357 /* must only be called with zfcp_data.config_sema taken */
358 adapter->pool.fsf_req_erp =
359 mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
360 if (!adapter->pool.fsf_req_erp)
361 return -ENOMEM;
362
363 adapter->pool.fsf_req_scsi =
364 mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
365 if (!adapter->pool.fsf_req_scsi)
366 return -ENOMEM;
367
368 adapter->pool.fsf_req_abort =
369 mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
370 if (!adapter->pool.fsf_req_abort)
371 return -ENOMEM;
372
373 adapter->pool.fsf_req_status_read =
374 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
375 sizeof(struct zfcp_fsf_req));
376 if (!adapter->pool.fsf_req_status_read)
377 return -ENOMEM;
378
379 adapter->pool.data_status_read =
380 mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
381 zfcp_data.sr_buffer_cache);
382 if (!adapter->pool.data_status_read)
383 return -ENOMEM;
384
385 adapter->pool.data_gid_pn =
386 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
387 if (!adapter->pool.data_gid_pn)
388 return -ENOMEM;
389
390 return 0;
391 }
392
zfcp_free_low_mem_buffers(struct zfcp_adapter * adapter)393 static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
394 {
395 /* zfcp_data.config_sema must be held */
396 if (adapter->pool.fsf_req_erp)
397 mempool_destroy(adapter->pool.fsf_req_erp);
398 if (adapter->pool.fsf_req_scsi)
399 mempool_destroy(adapter->pool.fsf_req_scsi);
400 if (adapter->pool.fsf_req_abort)
401 mempool_destroy(adapter->pool.fsf_req_abort);
402 if (adapter->pool.fsf_req_status_read)
403 mempool_destroy(adapter->pool.fsf_req_status_read);
404 if (adapter->pool.data_status_read)
405 mempool_destroy(adapter->pool.data_status_read);
406 if (adapter->pool.data_gid_pn)
407 mempool_destroy(adapter->pool.data_gid_pn);
408 }
409
410 /**
411 * zfcp_status_read_refill - refill the long running status_read_requests
412 * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
413 *
414 * Returns: 0 on success, 1 otherwise
415 *
416 * if there are 16 or more status_read requests missing an adapter_reopen
417 * is triggered
418 */
zfcp_status_read_refill(struct zfcp_adapter * adapter)419 int zfcp_status_read_refill(struct zfcp_adapter *adapter)
420 {
421 while (atomic_read(&adapter->stat_miss) > 0)
422 if (zfcp_fsf_status_read(adapter)) {
423 if (atomic_read(&adapter->stat_miss) >= 16) {
424 zfcp_erp_adapter_reopen(adapter, 0, 103, NULL);
425 return 1;
426 }
427 break;
428 } else
429 atomic_dec(&adapter->stat_miss);
430 return 0;
431 }
432
_zfcp_status_read_scheduler(struct work_struct * work)433 static void _zfcp_status_read_scheduler(struct work_struct *work)
434 {
435 zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
436 stat_work));
437 }
438
zfcp_print_sl(struct seq_file * m,struct service_level * sl)439 static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
440 {
441 struct zfcp_adapter *adapter =
442 container_of(sl, struct zfcp_adapter, service_level);
443
444 seq_printf(m, "zfcp: %s microcode level %x\n",
445 dev_name(&adapter->ccw_device->dev),
446 adapter->fsf_lic_version);
447 }
448
449 /**
450 * zfcp_adapter_enqueue - enqueue a new adapter to the list
451 * @ccw_device: pointer to the struct cc_device
452 *
453 * Returns: 0 if a new adapter was successfully enqueued
454 * -ENOMEM if alloc failed
455 * Enqueues an adapter at the end of the adapter list in the driver data.
456 * All adapter internal structures are set up.
457 * Proc-fs entries are also created.
458 * locks: config_sema must be held to serialise changes to the adapter list
459 */
zfcp_adapter_enqueue(struct ccw_device * ccw_device)460 int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
461 {
462 struct zfcp_adapter *adapter;
463
464 /*
465 * Note: It is safe to release the list_lock, as any list changes
466 * are protected by the config_sema, which must be held to get here
467 */
468
469 adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
470 if (!adapter)
471 return -ENOMEM;
472
473 ccw_device->handler = NULL;
474 adapter->ccw_device = ccw_device;
475 atomic_set(&adapter->refcount, 0);
476
477 if (zfcp_qdio_allocate(adapter))
478 goto qdio_allocate_failed;
479
480 if (zfcp_allocate_low_mem_buffers(adapter))
481 goto failed_low_mem_buffers;
482
483 if (zfcp_reqlist_alloc(adapter))
484 goto failed_low_mem_buffers;
485
486 if (zfcp_adapter_debug_register(adapter))
487 goto debug_register_failed;
488
489 init_waitqueue_head(&adapter->remove_wq);
490 init_waitqueue_head(&adapter->erp_thread_wqh);
491 init_waitqueue_head(&adapter->erp_done_wqh);
492
493 INIT_LIST_HEAD(&adapter->port_list_head);
494 INIT_LIST_HEAD(&adapter->erp_ready_head);
495 INIT_LIST_HEAD(&adapter->erp_running_head);
496
497 spin_lock_init(&adapter->req_list_lock);
498
499 spin_lock_init(&adapter->hba_dbf_lock);
500 spin_lock_init(&adapter->san_dbf_lock);
501 spin_lock_init(&adapter->scsi_dbf_lock);
502 spin_lock_init(&adapter->rec_dbf_lock);
503 spin_lock_init(&adapter->req_q_lock);
504
505 rwlock_init(&adapter->erp_lock);
506 rwlock_init(&adapter->abort_lock);
507
508 sema_init(&adapter->erp_ready_sem, 0);
509
510 INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
511 INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later);
512
513 adapter->service_level.seq_print = zfcp_print_sl;
514
515 /* mark adapter unusable as long as sysfs registration is not complete */
516 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
517
518 dev_set_drvdata(&ccw_device->dev, adapter);
519
520 if (sysfs_create_group(&ccw_device->dev.kobj,
521 &zfcp_sysfs_adapter_attrs))
522 goto sysfs_failed;
523
524 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
525 zfcp_fc_nameserver_init(adapter);
526
527 if (!zfcp_adapter_scsi_register(adapter))
528 return 0;
529
530 sysfs_failed:
531 zfcp_adapter_debug_unregister(adapter);
532 debug_register_failed:
533 dev_set_drvdata(&ccw_device->dev, NULL);
534 kfree(adapter->req_list);
535 failed_low_mem_buffers:
536 zfcp_free_low_mem_buffers(adapter);
537 qdio_allocate_failed:
538 zfcp_qdio_free(adapter);
539 kfree(adapter);
540 return -ENOMEM;
541 }
542
543 /**
544 * zfcp_adapter_dequeue - remove the adapter from the resource list
545 * @adapter: pointer to struct zfcp_adapter which should be removed
546 * locks: adapter list write lock is assumed to be held by caller
547 */
zfcp_adapter_dequeue(struct zfcp_adapter * adapter)548 void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
549 {
550 int retval = 0;
551 unsigned long flags;
552
553 cancel_work_sync(&adapter->scan_work);
554 cancel_work_sync(&adapter->stat_work);
555 zfcp_adapter_scsi_unregister(adapter);
556 sysfs_remove_group(&adapter->ccw_device->dev.kobj,
557 &zfcp_sysfs_adapter_attrs);
558 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
559 /* sanity check: no pending FSF requests */
560 spin_lock_irqsave(&adapter->req_list_lock, flags);
561 retval = zfcp_reqlist_isempty(adapter);
562 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
563 if (!retval)
564 return;
565
566 zfcp_adapter_debug_unregister(adapter);
567 zfcp_qdio_free(adapter);
568 zfcp_free_low_mem_buffers(adapter);
569 kfree(adapter->req_list);
570 kfree(adapter->fc_stats);
571 kfree(adapter->stats_reset_data);
572 kfree(adapter);
573 }
574
zfcp_sysfs_port_release(struct device * dev)575 static void zfcp_sysfs_port_release(struct device *dev)
576 {
577 kfree(container_of(dev, struct zfcp_port, sysfs_device));
578 }
579
580 /**
581 * zfcp_port_enqueue - enqueue port to port list of adapter
582 * @adapter: adapter where remote port is added
583 * @wwpn: WWPN of the remote port to be enqueued
584 * @status: initial status for the port
585 * @d_id: destination id of the remote port to be enqueued
586 * Returns: pointer to enqueued port on success, ERR_PTR on error
587 * Locks: config_sema must be held to serialize changes to the port list
588 *
589 * All port internal structures are set up and the sysfs entry is generated.
590 * d_id is used to enqueue ports with a well known address like the Directory
591 * Service for nameserver lookup.
592 */
zfcp_port_enqueue(struct zfcp_adapter * adapter,u64 wwpn,u32 status,u32 d_id)593 struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
594 u32 status, u32 d_id)
595 {
596 struct zfcp_port *port;
597 int retval;
598
599 port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
600 if (!port)
601 return ERR_PTR(-ENOMEM);
602
603 init_waitqueue_head(&port->remove_wq);
604 INIT_LIST_HEAD(&port->unit_list_head);
605 INIT_WORK(&port->gid_pn_work, zfcp_erp_port_strategy_open_lookup);
606
607 port->adapter = adapter;
608 port->d_id = d_id;
609 port->wwpn = wwpn;
610
611 /* mark port unusable as long as sysfs registration is not complete */
612 atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status);
613 atomic_set(&port->refcount, 0);
614
615 dev_set_name(&port->sysfs_device, "0x%016llx",
616 (unsigned long long)wwpn);
617 port->sysfs_device.parent = &adapter->ccw_device->dev;
618
619 port->sysfs_device.release = zfcp_sysfs_port_release;
620 dev_set_drvdata(&port->sysfs_device, port);
621
622 read_lock_irq(&zfcp_data.config_lock);
623 if (!(status & ZFCP_STATUS_PORT_NO_WWPN))
624 if (zfcp_get_port_by_wwpn(adapter, wwpn)) {
625 read_unlock_irq(&zfcp_data.config_lock);
626 goto err_out_free;
627 }
628 read_unlock_irq(&zfcp_data.config_lock);
629
630 if (device_register(&port->sysfs_device))
631 goto err_out_free;
632
633 retval = sysfs_create_group(&port->sysfs_device.kobj,
634 &zfcp_sysfs_port_attrs);
635
636 if (retval) {
637 device_unregister(&port->sysfs_device);
638 goto err_out;
639 }
640
641 zfcp_port_get(port);
642
643 write_lock_irq(&zfcp_data.config_lock);
644 list_add_tail(&port->list, &adapter->port_list_head);
645 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
646 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
647
648 write_unlock_irq(&zfcp_data.config_lock);
649
650 zfcp_adapter_get(adapter);
651 return port;
652
653 err_out_free:
654 kfree(port);
655 err_out:
656 return ERR_PTR(-EINVAL);
657 }
658
659 /**
660 * zfcp_port_dequeue - dequeues a port from the port list of the adapter
661 * @port: pointer to struct zfcp_port which should be removed
662 */
zfcp_port_dequeue(struct zfcp_port * port)663 void zfcp_port_dequeue(struct zfcp_port *port)
664 {
665 wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
666 write_lock_irq(&zfcp_data.config_lock);
667 list_del(&port->list);
668 write_unlock_irq(&zfcp_data.config_lock);
669 if (port->rport)
670 fc_remote_port_delete(port->rport);
671 port->rport = NULL;
672 zfcp_adapter_put(port->adapter);
673 sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs);
674 device_unregister(&port->sysfs_device);
675 }
676
677 /**
678 * zfcp_sg_free_table - free memory used by scatterlists
679 * @sg: pointer to scatterlist
680 * @count: number of scatterlist which are to be free'ed
681 * the scatterlist are expected to reference pages always
682 */
zfcp_sg_free_table(struct scatterlist * sg,int count)683 void zfcp_sg_free_table(struct scatterlist *sg, int count)
684 {
685 int i;
686
687 for (i = 0; i < count; i++, sg++)
688 if (sg)
689 free_page((unsigned long) sg_virt(sg));
690 else
691 break;
692 }
693
694 /**
695 * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
696 * @sg: pointer to struct scatterlist
697 * @count: number of scatterlists which should be assigned with buffers
698 * of size page
699 *
700 * Returns: 0 on success, -ENOMEM otherwise
701 */
zfcp_sg_setup_table(struct scatterlist * sg,int count)702 int zfcp_sg_setup_table(struct scatterlist *sg, int count)
703 {
704 void *addr;
705 int i;
706
707 sg_init_table(sg, count);
708 for (i = 0; i < count; i++, sg++) {
709 addr = (void *) get_zeroed_page(GFP_KERNEL);
710 if (!addr) {
711 zfcp_sg_free_table(sg, i);
712 return -ENOMEM;
713 }
714 sg_set_buf(sg, addr, PAGE_SIZE);
715 }
716 return 0;
717 }
718