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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
40MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
41MODULE_DESCRIPTION("FCP HBA driver");
42MODULE_LICENSE("GPL");
43
44static char *init_device;
45module_param_named(device, init_device, charp, 0400);
46MODULE_PARM_DESC(device, "specify initial device");
47
48static struct kmem_cache * __init 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
54static 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
60 cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
61 if (!cdev)
62 return;
63
64 if (ccw_device_set_online(cdev))
65 goto out_ccw_device;
66
67 adapter = zfcp_ccw_adapter_by_cdev(cdev);
68 if (!adapter)
69 goto out_ccw_device;
70
71 port = zfcp_get_port_by_wwpn(adapter, wwpn);
72 if (!port)
73 goto out_port;
74 flush_work(&port->rport_work);
75
76 zfcp_unit_add(port, lun);
77 put_device(&port->dev);
78
79out_port:
80 zfcp_ccw_adapter_put(adapter);
81out_ccw_device:
82 put_device(&cdev->dev);
83 return;
84}
85
86static void __init zfcp_init_device_setup(char *devstr)
87{
88 char *token;
89 char *str, *str_saved;
90 char busid[ZFCP_BUS_ID_SIZE];
91 u64 wwpn, lun;
92
93
94 str_saved = kstrdup(devstr, GFP_KERNEL);
95 str = str_saved;
96 if (!str)
97 return;
98
99 token = strsep(&str, ",");
100 if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
101 goto err_out;
102 strncpy(busid, token, ZFCP_BUS_ID_SIZE);
103
104 token = strsep(&str, ",");
105 if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn))
106 goto err_out;
107
108 token = strsep(&str, ",");
109 if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun))
110 goto err_out;
111
112 kfree(str_saved);
113 zfcp_init_device_configure(busid, wwpn, lun);
114 return;
115
116err_out:
117 kfree(str_saved);
118 pr_err("%s is not a valid SCSI device\n", devstr);
119}
120
121static int __init zfcp_module_init(void)
122{
123 int retval = -ENOMEM;
124
125 zfcp_data.gpn_ft_cache = zfcp_cache_hw_align("zfcp_gpn",
126 sizeof(struct zfcp_fc_gpn_ft_req));
127 if (!zfcp_data.gpn_ft_cache)
128 goto out;
129
130 zfcp_data.qtcb_cache = zfcp_cache_hw_align("zfcp_qtcb",
131 sizeof(struct fsf_qtcb));
132 if (!zfcp_data.qtcb_cache)
133 goto out_qtcb_cache;
134
135 zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr",
136 sizeof(struct fsf_status_read_buffer));
137 if (!zfcp_data.sr_buffer_cache)
138 goto out_sr_cache;
139
140 zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid",
141 sizeof(struct zfcp_fc_gid_pn));
142 if (!zfcp_data.gid_pn_cache)
143 goto out_gid_cache;
144
145 zfcp_data.adisc_cache = zfcp_cache_hw_align("zfcp_adisc",
146 sizeof(struct zfcp_fc_els_adisc));
147 if (!zfcp_data.adisc_cache)
148 goto out_adisc_cache;
149
150 zfcp_data.scsi_transport_template =
151 fc_attach_transport(&zfcp_transport_functions);
152 if (!zfcp_data.scsi_transport_template)
153 goto out_transport;
154 scsi_transport_reserve_device(zfcp_data.scsi_transport_template,
155 sizeof(struct zfcp_scsi_dev));
156
157
158 retval = misc_register(&zfcp_cfdc_misc);
159 if (retval) {
160 pr_err("Registering the misc device zfcp_cfdc failed\n");
161 goto out_misc;
162 }
163
164 retval = ccw_driver_register(&zfcp_ccw_driver);
165 if (retval) {
166 pr_err("The zfcp device driver could not register with "
167 "the common I/O layer\n");
168 goto out_ccw_register;
169 }
170
171 if (init_device)
172 zfcp_init_device_setup(init_device);
173 return 0;
174
175out_ccw_register:
176 misc_deregister(&zfcp_cfdc_misc);
177out_misc:
178 fc_release_transport(zfcp_data.scsi_transport_template);
179out_transport:
180 kmem_cache_destroy(zfcp_data.adisc_cache);
181out_adisc_cache:
182 kmem_cache_destroy(zfcp_data.gid_pn_cache);
183out_gid_cache:
184 kmem_cache_destroy(zfcp_data.sr_buffer_cache);
185out_sr_cache:
186 kmem_cache_destroy(zfcp_data.qtcb_cache);
187out_qtcb_cache:
188 kmem_cache_destroy(zfcp_data.gpn_ft_cache);
189out:
190 return retval;
191}
192
193module_init(zfcp_module_init);
194
195static void __exit zfcp_module_exit(void)
196{
197 ccw_driver_unregister(&zfcp_ccw_driver);
198 misc_deregister(&zfcp_cfdc_misc);
199 fc_release_transport(zfcp_data.scsi_transport_template);
200 kmem_cache_destroy(zfcp_data.adisc_cache);
201 kmem_cache_destroy(zfcp_data.gid_pn_cache);
202 kmem_cache_destroy(zfcp_data.sr_buffer_cache);
203 kmem_cache_destroy(zfcp_data.qtcb_cache);
204 kmem_cache_destroy(zfcp_data.gpn_ft_cache);
205}
206
207module_exit(zfcp_module_exit);
208
209
210
211
212
213
214
215
216struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
217 u64 wwpn)
218{
219 unsigned long flags;
220 struct zfcp_port *port;
221
222 read_lock_irqsave(&adapter->port_list_lock, flags);
223 list_for_each_entry(port, &adapter->port_list, list)
224 if (port->wwpn == wwpn) {
225 if (!get_device(&port->dev))
226 port = NULL;
227 read_unlock_irqrestore(&adapter->port_list_lock, flags);
228 return port;
229 }
230 read_unlock_irqrestore(&adapter->port_list_lock, flags);
231 return NULL;
232}
233
234static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
235{
236 adapter->pool.erp_req =
237 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
238 if (!adapter->pool.erp_req)
239 return -ENOMEM;
240
241 adapter->pool.gid_pn_req =
242 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
243 if (!adapter->pool.gid_pn_req)
244 return -ENOMEM;
245
246 adapter->pool.scsi_req =
247 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
248 if (!adapter->pool.scsi_req)
249 return -ENOMEM;
250
251 adapter->pool.scsi_abort =
252 mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
253 if (!adapter->pool.scsi_abort)
254 return -ENOMEM;
255
256 adapter->pool.status_read_req =
257 mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
258 sizeof(struct zfcp_fsf_req));
259 if (!adapter->pool.status_read_req)
260 return -ENOMEM;
261
262 adapter->pool.qtcb_pool =
263 mempool_create_slab_pool(4, zfcp_data.qtcb_cache);
264 if (!adapter->pool.qtcb_pool)
265 return -ENOMEM;
266
267 adapter->pool.status_read_data =
268 mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
269 zfcp_data.sr_buffer_cache);
270 if (!adapter->pool.status_read_data)
271 return -ENOMEM;
272
273 adapter->pool.gid_pn =
274 mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
275 if (!adapter->pool.gid_pn)
276 return -ENOMEM;
277
278 return 0;
279}
280
281static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
282{
283 if (adapter->pool.erp_req)
284 mempool_destroy(adapter->pool.erp_req);
285 if (adapter->pool.scsi_req)
286 mempool_destroy(adapter->pool.scsi_req);
287 if (adapter->pool.scsi_abort)
288 mempool_destroy(adapter->pool.scsi_abort);
289 if (adapter->pool.qtcb_pool)
290 mempool_destroy(adapter->pool.qtcb_pool);
291 if (adapter->pool.status_read_req)
292 mempool_destroy(adapter->pool.status_read_req);
293 if (adapter->pool.status_read_data)
294 mempool_destroy(adapter->pool.status_read_data);
295 if (adapter->pool.gid_pn)
296 mempool_destroy(adapter->pool.gid_pn);
297}
298
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303
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305
306
307
308int zfcp_status_read_refill(struct zfcp_adapter *adapter)
309{
310 while (atomic_read(&adapter->stat_miss) > 0)
311 if (zfcp_fsf_status_read(adapter->qdio)) {
312 if (atomic_read(&adapter->stat_miss) >=
313 adapter->stat_read_buf_num) {
314 zfcp_erp_adapter_reopen(adapter, 0, "axsref1");
315 return 1;
316 }
317 break;
318 } else
319 atomic_dec(&adapter->stat_miss);
320 return 0;
321}
322
323static void _zfcp_status_read_scheduler(struct work_struct *work)
324{
325 zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
326 stat_work));
327}
328
329static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
330{
331 struct zfcp_adapter *adapter =
332 container_of(sl, struct zfcp_adapter, service_level);
333
334 seq_printf(m, "zfcp: %s microcode level %x\n",
335 dev_name(&adapter->ccw_device->dev),
336 adapter->fsf_lic_version);
337}
338
339static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
340{
341 char name[TASK_COMM_LEN];
342
343 snprintf(name, sizeof(name), "zfcp_q_%s",
344 dev_name(&adapter->ccw_device->dev));
345 adapter->work_queue = create_singlethread_workqueue(name);
346
347 if (adapter->work_queue)
348 return 0;
349 return -ENOMEM;
350}
351
352static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
353{
354 if (adapter->work_queue)
355 destroy_workqueue(adapter->work_queue);
356 adapter->work_queue = NULL;
357
358}
359
360
361
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363
364
365
366
367
368
369struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
370{
371 struct zfcp_adapter *adapter;
372
373 if (!get_device(&ccw_device->dev))
374 return ERR_PTR(-ENODEV);
375
376 adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
377 if (!adapter) {
378 put_device(&ccw_device->dev);
379 return ERR_PTR(-ENOMEM);
380 }
381
382 kref_init(&adapter->ref);
383
384 ccw_device->handler = NULL;
385 adapter->ccw_device = ccw_device;
386
387 INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
388 INIT_WORK(&adapter->scan_work, zfcp_fc_scan_ports);
389
390 if (zfcp_qdio_setup(adapter))
391 goto failed;
392
393 if (zfcp_allocate_low_mem_buffers(adapter))
394 goto failed;
395
396 adapter->req_list = zfcp_reqlist_alloc();
397 if (!adapter->req_list)
398 goto failed;
399
400 if (zfcp_dbf_adapter_register(adapter))
401 goto failed;
402
403 if (zfcp_setup_adapter_work_queue(adapter))
404 goto failed;
405
406 if (zfcp_fc_gs_setup(adapter))
407 goto failed;
408
409 rwlock_init(&adapter->port_list_lock);
410 INIT_LIST_HEAD(&adapter->port_list);
411
412 INIT_LIST_HEAD(&adapter->events.list);
413 INIT_WORK(&adapter->events.work, zfcp_fc_post_event);
414 spin_lock_init(&adapter->events.list_lock);
415
416 init_waitqueue_head(&adapter->erp_ready_wq);
417 init_waitqueue_head(&adapter->erp_done_wqh);
418
419 INIT_LIST_HEAD(&adapter->erp_ready_head);
420 INIT_LIST_HEAD(&adapter->erp_running_head);
421
422 rwlock_init(&adapter->erp_lock);
423 rwlock_init(&adapter->abort_lock);
424
425 if (zfcp_erp_thread_setup(adapter))
426 goto failed;
427
428 adapter->service_level.seq_print = zfcp_print_sl;
429
430 dev_set_drvdata(&ccw_device->dev, adapter);
431
432 if (sysfs_create_group(&ccw_device->dev.kobj,
433 &zfcp_sysfs_adapter_attrs))
434 goto failed;
435
436
437 adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN;
438 adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
439
440 if (!zfcp_adapter_scsi_register(adapter))
441 return adapter;
442
443failed:
444 zfcp_adapter_unregister(adapter);
445 return ERR_PTR(-ENOMEM);
446}
447
448void zfcp_adapter_unregister(struct zfcp_adapter *adapter)
449{
450 struct ccw_device *cdev = adapter->ccw_device;
451
452 cancel_work_sync(&adapter->scan_work);
453 cancel_work_sync(&adapter->stat_work);
454 zfcp_destroy_adapter_work_queue(adapter);
455
456 zfcp_fc_wka_ports_force_offline(adapter->gs);
457 zfcp_adapter_scsi_unregister(adapter);
458 sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs);
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);
465}
466
467
468
469
470
471
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 kfree(adapter->req_list);
482 kfree(adapter->fc_stats);
483 kfree(adapter->stats_reset_data);
484 kfree(adapter);
485 put_device(&cdev->dev);
486}
487
488
489
490
491
492
493
494
495void zfcp_device_unregister(struct device *dev,
496 const struct attribute_group *grp)
497{
498 sysfs_remove_group(&dev->kobj, grp);
499 device_unregister(dev);
500}
501
502static void zfcp_port_release(struct device *dev)
503{
504 struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
505
506 zfcp_ccw_adapter_put(port->adapter);
507 kfree(port);
508}
509
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519
520
521
522struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
523 u32 status, u32 d_id)
524{
525 struct zfcp_port *port;
526 int retval = -ENOMEM;
527
528 kref_get(&adapter->ref);
529
530 port = zfcp_get_port_by_wwpn(adapter, wwpn);
531 if (port) {
532 put_device(&port->dev);
533 retval = -EEXIST;
534 goto err_out;
535 }
536
537 port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
538 if (!port)
539 goto err_out;
540
541 rwlock_init(&port->unit_list_lock);
542 INIT_LIST_HEAD(&port->unit_list);
543
544 INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
545 INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
546 INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
547
548 port->adapter = adapter;
549 port->d_id = d_id;
550 port->wwpn = wwpn;
551 port->rport_task = RPORT_NONE;
552 port->dev.parent = &adapter->ccw_device->dev;
553 port->dev.release = zfcp_port_release;
554
555 if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
556 kfree(port);
557 goto err_out;
558 }
559 retval = -EINVAL;
560
561 if (device_register(&port->dev)) {
562 put_device(&port->dev);
563 goto err_out;
564 }
565
566 if (sysfs_create_group(&port->dev.kobj,
567 &zfcp_sysfs_port_attrs))
568 goto err_out_put;
569
570 write_lock_irq(&adapter->port_list_lock);
571 list_add_tail(&port->list, &adapter->port_list);
572 write_unlock_irq(&adapter->port_list_lock);
573
574 atomic_set_mask(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);
575
576 return port;
577
578err_out_put:
579 device_unregister(&port->dev);
580err_out:
581 zfcp_ccw_adapter_put(adapter);
582 return ERR_PTR(retval);
583}
584
585
586
587
588
589
590
591void zfcp_sg_free_table(struct scatterlist *sg, int count)
592{
593 int i;
594
595 for (i = 0; i < count; i++, sg++)
596 if (sg)
597 free_page((unsigned long) sg_virt(sg));
598 else
599 break;
600}
601
602
603
604
605
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607
608
609
610int zfcp_sg_setup_table(struct scatterlist *sg, int count)
611{
612 void *addr;
613 int i;
614
615 sg_init_table(sg, count);
616 for (i = 0; i < count; i++, sg++) {
617 addr = (void *) get_zeroed_page(GFP_KERNEL);
618 if (!addr) {
619 zfcp_sg_free_table(sg, i);
620 return -ENOMEM;
621 }
622 sg_set_buf(sg, addr, PAGE_SIZE);
623 }
624 return 0;
625}
626