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8
9#define KMSG_COMPONENT "zfcp"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/kthread.h>
13#include "zfcp_ext.h"
14#include "zfcp_reqlist.h"
15
16#define ZFCP_MAX_ERPS 3
17
18enum zfcp_erp_act_flags {
19 ZFCP_STATUS_ERP_TIMEDOUT = 0x10000000,
20 ZFCP_STATUS_ERP_CLOSE_ONLY = 0x01000000,
21 ZFCP_STATUS_ERP_DISMISSING = 0x00100000,
22 ZFCP_STATUS_ERP_DISMISSED = 0x00200000,
23 ZFCP_STATUS_ERP_LOWMEM = 0x00400000,
24 ZFCP_STATUS_ERP_NO_REF = 0x00800000,
25};
26
27enum zfcp_erp_steps {
28 ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
29 ZFCP_ERP_STEP_FSF_XCONFIG = 0x0001,
30 ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
31 ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
32 ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
33 ZFCP_ERP_STEP_LUN_CLOSING = 0x1000,
34 ZFCP_ERP_STEP_LUN_OPENING = 0x2000,
35};
36
37enum zfcp_erp_act_type {
38 ZFCP_ERP_ACTION_REOPEN_LUN = 1,
39 ZFCP_ERP_ACTION_REOPEN_PORT = 2,
40 ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
41 ZFCP_ERP_ACTION_REOPEN_ADAPTER = 4,
42};
43
44enum zfcp_erp_act_state {
45 ZFCP_ERP_ACTION_RUNNING = 1,
46 ZFCP_ERP_ACTION_READY = 2,
47};
48
49enum zfcp_erp_act_result {
50 ZFCP_ERP_SUCCEEDED = 0,
51 ZFCP_ERP_FAILED = 1,
52 ZFCP_ERP_CONTINUES = 2,
53 ZFCP_ERP_EXIT = 3,
54 ZFCP_ERP_DISMISSED = 4,
55 ZFCP_ERP_NOMEM = 5,
56};
57
58static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
59{
60 zfcp_erp_clear_adapter_status(adapter,
61 ZFCP_STATUS_COMMON_UNBLOCKED | mask);
62}
63
64static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
65{
66 struct zfcp_erp_action *curr_act;
67
68 list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
69 if (act == curr_act)
70 return ZFCP_ERP_ACTION_RUNNING;
71 return 0;
72}
73
74static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
75{
76 struct zfcp_adapter *adapter = act->adapter;
77
78 list_move(&act->list, &act->adapter->erp_ready_head);
79 zfcp_dbf_rec_run("erardy1", act);
80 wake_up(&adapter->erp_ready_wq);
81 zfcp_dbf_rec_run("erardy2", act);
82}
83
84static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
85{
86 act->status |= ZFCP_STATUS_ERP_DISMISSED;
87 if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
88 zfcp_erp_action_ready(act);
89}
90
91static void zfcp_erp_action_dismiss_lun(struct scsi_device *sdev)
92{
93 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
94
95 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
96 zfcp_erp_action_dismiss(&zfcp_sdev->erp_action);
97}
98
99static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
100{
101 struct scsi_device *sdev;
102
103 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
104 zfcp_erp_action_dismiss(&port->erp_action);
105 else {
106 spin_lock(port->adapter->scsi_host->host_lock);
107 __shost_for_each_device(sdev, port->adapter->scsi_host)
108 if (sdev_to_zfcp(sdev)->port == port)
109 zfcp_erp_action_dismiss_lun(sdev);
110 spin_unlock(port->adapter->scsi_host->host_lock);
111 }
112}
113
114static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
115{
116 struct zfcp_port *port;
117
118 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
119 zfcp_erp_action_dismiss(&adapter->erp_action);
120 else {
121 read_lock(&adapter->port_list_lock);
122 list_for_each_entry(port, &adapter->port_list, list)
123 zfcp_erp_action_dismiss_port(port);
124 read_unlock(&adapter->port_list_lock);
125 }
126}
127
128static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
129 struct zfcp_port *port,
130 struct scsi_device *sdev)
131{
132 int need = want;
133 int l_status, p_status, a_status;
134 struct zfcp_scsi_dev *zfcp_sdev;
135
136 switch (want) {
137 case ZFCP_ERP_ACTION_REOPEN_LUN:
138 zfcp_sdev = sdev_to_zfcp(sdev);
139 l_status = atomic_read(&zfcp_sdev->status);
140 if (l_status & ZFCP_STATUS_COMMON_ERP_INUSE)
141 return 0;
142 p_status = atomic_read(&port->status);
143 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
144 p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
145 return 0;
146 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
147 need = ZFCP_ERP_ACTION_REOPEN_PORT;
148
149 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
150 p_status = atomic_read(&port->status);
151 if (!(p_status & ZFCP_STATUS_COMMON_OPEN))
152 need = ZFCP_ERP_ACTION_REOPEN_PORT;
153
154 case ZFCP_ERP_ACTION_REOPEN_PORT:
155 p_status = atomic_read(&port->status);
156 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
157 return 0;
158 a_status = atomic_read(&adapter->status);
159 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
160 a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
161 return 0;
162 if (p_status & ZFCP_STATUS_COMMON_NOESC)
163 return need;
164 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
165 need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
166
167 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
168 a_status = atomic_read(&adapter->status);
169 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
170 return 0;
171 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
172 !(a_status & ZFCP_STATUS_COMMON_OPEN))
173 return 0;
174 }
175
176 return need;
177}
178
179static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status,
180 struct zfcp_adapter *adapter,
181 struct zfcp_port *port,
182 struct scsi_device *sdev)
183{
184 struct zfcp_erp_action *erp_action;
185 struct zfcp_scsi_dev *zfcp_sdev;
186
187 switch (need) {
188 case ZFCP_ERP_ACTION_REOPEN_LUN:
189 zfcp_sdev = sdev_to_zfcp(sdev);
190 if (!(act_status & ZFCP_STATUS_ERP_NO_REF))
191 if (scsi_device_get(sdev))
192 return NULL;
193 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
194 &zfcp_sdev->status);
195 erp_action = &zfcp_sdev->erp_action;
196 memset(erp_action, 0, sizeof(struct zfcp_erp_action));
197 erp_action->port = port;
198 erp_action->sdev = sdev;
199 if (!(atomic_read(&zfcp_sdev->status) &
200 ZFCP_STATUS_COMMON_RUNNING))
201 act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
202 break;
203
204 case ZFCP_ERP_ACTION_REOPEN_PORT:
205 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
206 if (!get_device(&port->dev))
207 return NULL;
208 zfcp_erp_action_dismiss_port(port);
209 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
210 erp_action = &port->erp_action;
211 memset(erp_action, 0, sizeof(struct zfcp_erp_action));
212 erp_action->port = port;
213 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
214 act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
215 break;
216
217 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
218 kref_get(&adapter->ref);
219 zfcp_erp_action_dismiss_adapter(adapter);
220 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
221 erp_action = &adapter->erp_action;
222 memset(erp_action, 0, sizeof(struct zfcp_erp_action));
223 if (!(atomic_read(&adapter->status) &
224 ZFCP_STATUS_COMMON_RUNNING))
225 act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
226 break;
227
228 default:
229 return NULL;
230 }
231
232 erp_action->adapter = adapter;
233 erp_action->action = need;
234 erp_action->status = act_status;
235
236 return erp_action;
237}
238
239static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
240 struct zfcp_port *port,
241 struct scsi_device *sdev,
242 char *id, u32 act_status)
243{
244 int retval = 1, need;
245 struct zfcp_erp_action *act;
246
247 if (!adapter->erp_thread)
248 return -EIO;
249
250 need = zfcp_erp_required_act(want, adapter, port, sdev);
251 if (!need)
252 goto out;
253
254 act = zfcp_erp_setup_act(need, act_status, adapter, port, sdev);
255 if (!act)
256 goto out;
257 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
258 ++adapter->erp_total_count;
259 list_add_tail(&act->list, &adapter->erp_ready_head);
260 wake_up(&adapter->erp_ready_wq);
261 retval = 0;
262 out:
263 zfcp_dbf_rec_trig(id, adapter, port, sdev, want, need);
264 return retval;
265}
266
267static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
268 int clear_mask, char *id)
269{
270 zfcp_erp_adapter_block(adapter, clear_mask);
271 zfcp_scsi_schedule_rports_block(adapter);
272
273
274 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
275 zfcp_erp_set_adapter_status(adapter,
276 ZFCP_STATUS_COMMON_ERP_FAILED);
277 return -EIO;
278 }
279 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
280 adapter, NULL, NULL, id, 0);
281}
282
283
284
285
286
287
288
289void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear, char *id)
290{
291 unsigned long flags;
292
293 zfcp_erp_adapter_block(adapter, clear);
294 zfcp_scsi_schedule_rports_block(adapter);
295
296 write_lock_irqsave(&adapter->erp_lock, flags);
297 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
298 zfcp_erp_set_adapter_status(adapter,
299 ZFCP_STATUS_COMMON_ERP_FAILED);
300 else
301 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter,
302 NULL, NULL, id, 0);
303 write_unlock_irqrestore(&adapter->erp_lock, flags);
304}
305
306
307
308
309
310
311
312void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
313 char *id)
314{
315 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
316 zfcp_erp_adapter_reopen(adapter, clear | flags, id);
317}
318
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320
321
322
323
324
325void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id)
326{
327 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
328 zfcp_erp_port_reopen(port, clear | flags, id);
329}
330
331static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
332{
333 zfcp_erp_clear_port_status(port,
334 ZFCP_STATUS_COMMON_UNBLOCKED | clear);
335}
336
337static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear,
338 char *id)
339{
340 zfcp_erp_port_block(port, clear);
341 zfcp_scsi_schedule_rport_block(port);
342
343 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
344 return;
345
346 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
347 port->adapter, port, NULL, id, 0);
348}
349
350
351
352
353
354
355
356void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id)
357{
358 unsigned long flags;
359 struct zfcp_adapter *adapter = port->adapter;
360
361 write_lock_irqsave(&adapter->erp_lock, flags);
362 _zfcp_erp_port_forced_reopen(port, clear, id);
363 write_unlock_irqrestore(&adapter->erp_lock, flags);
364}
365
366static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
367{
368 zfcp_erp_port_block(port, clear);
369 zfcp_scsi_schedule_rport_block(port);
370
371 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
372
373 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
374 return -EIO;
375 }
376
377 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
378 port->adapter, port, NULL, id, 0);
379}
380
381
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387
388
389int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
390{
391 int retval;
392 unsigned long flags;
393 struct zfcp_adapter *adapter = port->adapter;
394
395 write_lock_irqsave(&adapter->erp_lock, flags);
396 retval = _zfcp_erp_port_reopen(port, clear, id);
397 write_unlock_irqrestore(&adapter->erp_lock, flags);
398
399 return retval;
400}
401
402static void zfcp_erp_lun_block(struct scsi_device *sdev, int clear_mask)
403{
404 zfcp_erp_clear_lun_status(sdev,
405 ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask);
406}
407
408static void _zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id,
409 u32 act_status)
410{
411 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
412 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
413
414 zfcp_erp_lun_block(sdev, clear);
415
416 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
417 return;
418
419 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter,
420 zfcp_sdev->port, sdev, id, act_status);
421}
422
423
424
425
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427
428
429
430
431void zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id)
432{
433 unsigned long flags;
434 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
435 struct zfcp_port *port = zfcp_sdev->port;
436 struct zfcp_adapter *adapter = port->adapter;
437
438 write_lock_irqsave(&adapter->erp_lock, flags);
439 _zfcp_erp_lun_reopen(sdev, clear, id, 0);
440 write_unlock_irqrestore(&adapter->erp_lock, flags);
441}
442
443
444
445
446
447
448
449void zfcp_erp_lun_shutdown(struct scsi_device *sdev, int clear, char *id)
450{
451 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
452 zfcp_erp_lun_reopen(sdev, clear | flags, id);
453}
454
455
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458
459
460
461
462
463
464
465void zfcp_erp_lun_shutdown_wait(struct scsi_device *sdev, char *id)
466{
467 unsigned long flags;
468 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
469 struct zfcp_port *port = zfcp_sdev->port;
470 struct zfcp_adapter *adapter = port->adapter;
471 int clear = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
472
473 write_lock_irqsave(&adapter->erp_lock, flags);
474 _zfcp_erp_lun_reopen(sdev, clear, id, ZFCP_STATUS_ERP_NO_REF);
475 write_unlock_irqrestore(&adapter->erp_lock, flags);
476
477 zfcp_erp_wait(adapter);
478}
479
480static int status_change_set(unsigned long mask, atomic_t *status)
481{
482 return (atomic_read(status) ^ mask) & mask;
483}
484
485static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
486{
487 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
488 zfcp_dbf_rec_run("eraubl1", &adapter->erp_action);
489 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
490}
491
492static void zfcp_erp_port_unblock(struct zfcp_port *port)
493{
494 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
495 zfcp_dbf_rec_run("erpubl1", &port->erp_action);
496 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
497}
498
499static void zfcp_erp_lun_unblock(struct scsi_device *sdev)
500{
501 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
502
503 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status))
504 zfcp_dbf_rec_run("erlubl1", &sdev_to_zfcp(sdev)->erp_action);
505 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status);
506}
507
508static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
509{
510 list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
511 zfcp_dbf_rec_run("erator1", erp_action);
512}
513
514static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
515{
516 struct zfcp_adapter *adapter = act->adapter;
517 struct zfcp_fsf_req *req;
518
519 if (!act->fsf_req_id)
520 return;
521
522 spin_lock(&adapter->req_list->lock);
523 req = _zfcp_reqlist_find(adapter->req_list, act->fsf_req_id);
524 if (req && req->erp_action == act) {
525 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
526 ZFCP_STATUS_ERP_TIMEDOUT)) {
527 req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
528 zfcp_dbf_rec_run("erscf_1", act);
529 req->erp_action = NULL;
530 }
531 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
532 zfcp_dbf_rec_run("erscf_2", act);
533 if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
534 act->fsf_req_id = 0;
535 } else
536 act->fsf_req_id = 0;
537 spin_unlock(&adapter->req_list->lock);
538}
539
540
541
542
543
544
545void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
546{
547 struct zfcp_adapter *adapter = erp_action->adapter;
548 unsigned long flags;
549
550 write_lock_irqsave(&adapter->erp_lock, flags);
551 if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
552 erp_action->status |= set_mask;
553 zfcp_erp_action_ready(erp_action);
554 }
555 write_unlock_irqrestore(&adapter->erp_lock, flags);
556}
557
558
559
560
561
562void zfcp_erp_timeout_handler(unsigned long data)
563{
564 struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
565 zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
566}
567
568static void zfcp_erp_memwait_handler(unsigned long data)
569{
570 zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
571}
572
573static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
574{
575 init_timer(&erp_action->timer);
576 erp_action->timer.function = zfcp_erp_memwait_handler;
577 erp_action->timer.data = (unsigned long) erp_action;
578 erp_action->timer.expires = jiffies + HZ;
579 add_timer(&erp_action->timer);
580}
581
582static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
583 int clear, char *id)
584{
585 struct zfcp_port *port;
586
587 read_lock(&adapter->port_list_lock);
588 list_for_each_entry(port, &adapter->port_list, list)
589 _zfcp_erp_port_reopen(port, clear, id);
590 read_unlock(&adapter->port_list_lock);
591}
592
593static void _zfcp_erp_lun_reopen_all(struct zfcp_port *port, int clear,
594 char *id)
595{
596 struct scsi_device *sdev;
597
598 spin_lock(port->adapter->scsi_host->host_lock);
599 __shost_for_each_device(sdev, port->adapter->scsi_host)
600 if (sdev_to_zfcp(sdev)->port == port)
601 _zfcp_erp_lun_reopen(sdev, clear, id, 0);
602 spin_unlock(port->adapter->scsi_host->host_lock);
603}
604
605static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
606{
607 switch (act->action) {
608 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
609 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1");
610 break;
611 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
612 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2");
613 break;
614 case ZFCP_ERP_ACTION_REOPEN_PORT:
615 _zfcp_erp_port_reopen(act->port, 0, "ersff_3");
616 break;
617 case ZFCP_ERP_ACTION_REOPEN_LUN:
618 _zfcp_erp_lun_reopen(act->sdev, 0, "ersff_4", 0);
619 break;
620 }
621}
622
623static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
624{
625 switch (act->action) {
626 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
627 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1");
628 break;
629 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
630 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2");
631 break;
632 case ZFCP_ERP_ACTION_REOPEN_PORT:
633 _zfcp_erp_lun_reopen_all(act->port, 0, "ersfs_3");
634 break;
635 }
636}
637
638static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
639{
640 unsigned long flags;
641
642 read_lock_irqsave(&adapter->erp_lock, flags);
643 if (list_empty(&adapter->erp_ready_head) &&
644 list_empty(&adapter->erp_running_head)) {
645 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
646 &adapter->status);
647 wake_up(&adapter->erp_done_wqh);
648 }
649 read_unlock_irqrestore(&adapter->erp_lock, flags);
650}
651
652static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
653{
654 struct zfcp_port *port;
655 port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
656 adapter->peer_d_id);
657 if (IS_ERR(port))
658 return;
659 _zfcp_erp_port_reopen(port, 0, "ereptp1");
660}
661
662static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
663{
664 int retries;
665 int sleep = 1;
666 struct zfcp_adapter *adapter = erp_action->adapter;
667
668 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
669
670 for (retries = 7; retries; retries--) {
671 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
672 &adapter->status);
673 write_lock_irq(&adapter->erp_lock);
674 zfcp_erp_action_to_running(erp_action);
675 write_unlock_irq(&adapter->erp_lock);
676 if (zfcp_fsf_exchange_config_data(erp_action)) {
677 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
678 &adapter->status);
679 return ZFCP_ERP_FAILED;
680 }
681
682 wait_event(adapter->erp_ready_wq,
683 !list_empty(&adapter->erp_ready_head));
684 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
685 break;
686
687 if (!(atomic_read(&adapter->status) &
688 ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
689 break;
690
691 ssleep(sleep);
692 sleep *= 2;
693 }
694
695 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
696 &adapter->status);
697
698 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
699 return ZFCP_ERP_FAILED;
700
701 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
702 zfcp_erp_enqueue_ptp_port(adapter);
703
704 return ZFCP_ERP_SUCCEEDED;
705}
706
707static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
708{
709 int ret;
710 struct zfcp_adapter *adapter = act->adapter;
711
712 write_lock_irq(&adapter->erp_lock);
713 zfcp_erp_action_to_running(act);
714 write_unlock_irq(&adapter->erp_lock);
715
716 ret = zfcp_fsf_exchange_port_data(act);
717 if (ret == -EOPNOTSUPP)
718 return ZFCP_ERP_SUCCEEDED;
719 if (ret)
720 return ZFCP_ERP_FAILED;
721
722 zfcp_dbf_rec_run("erasox1", act);
723 wait_event(adapter->erp_ready_wq,
724 !list_empty(&adapter->erp_ready_head));
725 zfcp_dbf_rec_run("erasox2", act);
726 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
727 return ZFCP_ERP_FAILED;
728
729 return ZFCP_ERP_SUCCEEDED;
730}
731
732static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
733{
734 if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
735 return ZFCP_ERP_FAILED;
736
737 if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
738 return ZFCP_ERP_FAILED;
739
740 if (mempool_resize(act->adapter->pool.sr_data,
741 act->adapter->stat_read_buf_num, GFP_KERNEL))
742 return ZFCP_ERP_FAILED;
743
744 if (mempool_resize(act->adapter->pool.status_read_req,
745 act->adapter->stat_read_buf_num, GFP_KERNEL))
746 return ZFCP_ERP_FAILED;
747
748 atomic_set(&act->adapter->stat_miss, act->adapter->stat_read_buf_num);
749 if (zfcp_status_read_refill(act->adapter))
750 return ZFCP_ERP_FAILED;
751
752 return ZFCP_ERP_SUCCEEDED;
753}
754
755static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
756{
757 struct zfcp_adapter *adapter = act->adapter;
758
759
760 zfcp_qdio_close(adapter->qdio);
761 zfcp_fsf_req_dismiss_all(adapter);
762 adapter->fsf_req_seq_no = 0;
763 zfcp_fc_wka_ports_force_offline(adapter->gs);
764
765 zfcp_erp_clear_adapter_status(adapter, ZFCP_STATUS_COMMON_OPEN);
766
767 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
768 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
769}
770
771static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
772{
773 struct zfcp_adapter *adapter = act->adapter;
774
775 if (zfcp_qdio_open(adapter->qdio)) {
776 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
777 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
778 &adapter->status);
779 return ZFCP_ERP_FAILED;
780 }
781
782 if (zfcp_erp_adapter_strategy_open_fsf(act)) {
783 zfcp_erp_adapter_strategy_close(act);
784 return ZFCP_ERP_FAILED;
785 }
786
787 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
788
789 return ZFCP_ERP_SUCCEEDED;
790}
791
792static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
793{
794 struct zfcp_adapter *adapter = act->adapter;
795
796 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
797 zfcp_erp_adapter_strategy_close(act);
798 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
799 return ZFCP_ERP_EXIT;
800 }
801
802 if (zfcp_erp_adapter_strategy_open(act)) {
803 ssleep(8);
804 return ZFCP_ERP_FAILED;
805 }
806
807 return ZFCP_ERP_SUCCEEDED;
808}
809
810static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
811{
812 int retval;
813
814 retval = zfcp_fsf_close_physical_port(act);
815 if (retval == -ENOMEM)
816 return ZFCP_ERP_NOMEM;
817 act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
818 if (retval)
819 return ZFCP_ERP_FAILED;
820
821 return ZFCP_ERP_CONTINUES;
822}
823
824static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
825{
826 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
827}
828
829static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
830{
831 struct zfcp_port *port = erp_action->port;
832 int status = atomic_read(&port->status);
833
834 switch (erp_action->step) {
835 case ZFCP_ERP_STEP_UNINITIALIZED:
836 zfcp_erp_port_strategy_clearstati(port);
837 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
838 (status & ZFCP_STATUS_COMMON_OPEN))
839 return zfcp_erp_port_forced_strategy_close(erp_action);
840 else
841 return ZFCP_ERP_FAILED;
842
843 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
844 if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
845 return ZFCP_ERP_SUCCEEDED;
846 }
847 return ZFCP_ERP_FAILED;
848}
849
850static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
851{
852 int retval;
853
854 retval = zfcp_fsf_close_port(erp_action);
855 if (retval == -ENOMEM)
856 return ZFCP_ERP_NOMEM;
857 erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
858 if (retval)
859 return ZFCP_ERP_FAILED;
860 return ZFCP_ERP_CONTINUES;
861}
862
863static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
864{
865 int retval;
866
867 retval = zfcp_fsf_open_port(erp_action);
868 if (retval == -ENOMEM)
869 return ZFCP_ERP_NOMEM;
870 erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
871 if (retval)
872 return ZFCP_ERP_FAILED;
873 return ZFCP_ERP_CONTINUES;
874}
875
876static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
877{
878 struct zfcp_adapter *adapter = act->adapter;
879 struct zfcp_port *port = act->port;
880
881 if (port->wwpn != adapter->peer_wwpn) {
882 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
883 return ZFCP_ERP_FAILED;
884 }
885 port->d_id = adapter->peer_d_id;
886 return zfcp_erp_port_strategy_open_port(act);
887}
888
889static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
890{
891 struct zfcp_adapter *adapter = act->adapter;
892 struct zfcp_port *port = act->port;
893 int p_status = atomic_read(&port->status);
894
895 switch (act->step) {
896 case ZFCP_ERP_STEP_UNINITIALIZED:
897 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
898 case ZFCP_ERP_STEP_PORT_CLOSING:
899 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
900 return zfcp_erp_open_ptp_port(act);
901 if (!port->d_id) {
902 zfcp_fc_trigger_did_lookup(port);
903 return ZFCP_ERP_EXIT;
904 }
905 return zfcp_erp_port_strategy_open_port(act);
906
907 case ZFCP_ERP_STEP_PORT_OPENING:
908
909 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
910 if (!port->d_id) {
911 zfcp_fc_trigger_did_lookup(port);
912 return ZFCP_ERP_EXIT;
913 }
914 return ZFCP_ERP_SUCCEEDED;
915 }
916 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
917 port->d_id = 0;
918 return ZFCP_ERP_FAILED;
919 }
920
921 }
922 return ZFCP_ERP_FAILED;
923}
924
925static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
926{
927 struct zfcp_port *port = erp_action->port;
928 int p_status = atomic_read(&port->status);
929
930 if ((p_status & ZFCP_STATUS_COMMON_NOESC) &&
931 !(p_status & ZFCP_STATUS_COMMON_OPEN))
932 goto close_init_done;
933
934 switch (erp_action->step) {
935 case ZFCP_ERP_STEP_UNINITIALIZED:
936 zfcp_erp_port_strategy_clearstati(port);
937 if (p_status & ZFCP_STATUS_COMMON_OPEN)
938 return zfcp_erp_port_strategy_close(erp_action);
939 break;
940
941 case ZFCP_ERP_STEP_PORT_CLOSING:
942 if (p_status & ZFCP_STATUS_COMMON_OPEN)
943 return ZFCP_ERP_FAILED;
944 break;
945 }
946
947close_init_done:
948 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
949 return ZFCP_ERP_EXIT;
950
951 return zfcp_erp_port_strategy_open_common(erp_action);
952}
953
954static void zfcp_erp_lun_strategy_clearstati(struct scsi_device *sdev)
955{
956 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
957
958 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED,
959 &zfcp_sdev->status);
960}
961
962static int zfcp_erp_lun_strategy_close(struct zfcp_erp_action *erp_action)
963{
964 int retval = zfcp_fsf_close_lun(erp_action);
965 if (retval == -ENOMEM)
966 return ZFCP_ERP_NOMEM;
967 erp_action->step = ZFCP_ERP_STEP_LUN_CLOSING;
968 if (retval)
969 return ZFCP_ERP_FAILED;
970 return ZFCP_ERP_CONTINUES;
971}
972
973static int zfcp_erp_lun_strategy_open(struct zfcp_erp_action *erp_action)
974{
975 int retval = zfcp_fsf_open_lun(erp_action);
976 if (retval == -ENOMEM)
977 return ZFCP_ERP_NOMEM;
978 erp_action->step = ZFCP_ERP_STEP_LUN_OPENING;
979 if (retval)
980 return ZFCP_ERP_FAILED;
981 return ZFCP_ERP_CONTINUES;
982}
983
984static int zfcp_erp_lun_strategy(struct zfcp_erp_action *erp_action)
985{
986 struct scsi_device *sdev = erp_action->sdev;
987 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
988
989 switch (erp_action->step) {
990 case ZFCP_ERP_STEP_UNINITIALIZED:
991 zfcp_erp_lun_strategy_clearstati(sdev);
992 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
993 return zfcp_erp_lun_strategy_close(erp_action);
994
995 case ZFCP_ERP_STEP_LUN_CLOSING:
996 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
997 return ZFCP_ERP_FAILED;
998 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
999 return ZFCP_ERP_EXIT;
1000 return zfcp_erp_lun_strategy_open(erp_action);
1001
1002 case ZFCP_ERP_STEP_LUN_OPENING:
1003 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
1004 return ZFCP_ERP_SUCCEEDED;
1005 }
1006 return ZFCP_ERP_FAILED;
1007}
1008
1009static int zfcp_erp_strategy_check_lun(struct scsi_device *sdev, int result)
1010{
1011 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1012
1013 switch (result) {
1014 case ZFCP_ERP_SUCCEEDED :
1015 atomic_set(&zfcp_sdev->erp_counter, 0);
1016 zfcp_erp_lun_unblock(sdev);
1017 break;
1018 case ZFCP_ERP_FAILED :
1019 atomic_inc(&zfcp_sdev->erp_counter);
1020 if (atomic_read(&zfcp_sdev->erp_counter) > ZFCP_MAX_ERPS) {
1021 dev_err(&zfcp_sdev->port->adapter->ccw_device->dev,
1022 "ERP failed for LUN 0x%016Lx on "
1023 "port 0x%016Lx\n",
1024 (unsigned long long)zfcp_scsi_dev_lun(sdev),
1025 (unsigned long long)zfcp_sdev->port->wwpn);
1026 zfcp_erp_set_lun_status(sdev,
1027 ZFCP_STATUS_COMMON_ERP_FAILED);
1028 }
1029 break;
1030 }
1031
1032 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1033 zfcp_erp_lun_block(sdev, 0);
1034 result = ZFCP_ERP_EXIT;
1035 }
1036 return result;
1037}
1038
1039static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1040{
1041 switch (result) {
1042 case ZFCP_ERP_SUCCEEDED :
1043 atomic_set(&port->erp_counter, 0);
1044 zfcp_erp_port_unblock(port);
1045 break;
1046
1047 case ZFCP_ERP_FAILED :
1048 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1049 zfcp_erp_port_block(port, 0);
1050 result = ZFCP_ERP_EXIT;
1051 }
1052 atomic_inc(&port->erp_counter);
1053 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1054 dev_err(&port->adapter->ccw_device->dev,
1055 "ERP failed for remote port 0x%016Lx\n",
1056 (unsigned long long)port->wwpn);
1057 zfcp_erp_set_port_status(port,
1058 ZFCP_STATUS_COMMON_ERP_FAILED);
1059 }
1060 break;
1061 }
1062
1063 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1064 zfcp_erp_port_block(port, 0);
1065 result = ZFCP_ERP_EXIT;
1066 }
1067 return result;
1068}
1069
1070static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1071 int result)
1072{
1073 switch (result) {
1074 case ZFCP_ERP_SUCCEEDED :
1075 atomic_set(&adapter->erp_counter, 0);
1076 zfcp_erp_adapter_unblock(adapter);
1077 break;
1078
1079 case ZFCP_ERP_FAILED :
1080 atomic_inc(&adapter->erp_counter);
1081 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1082 dev_err(&adapter->ccw_device->dev,
1083 "ERP cannot recover an error "
1084 "on the FCP device\n");
1085 zfcp_erp_set_adapter_status(adapter,
1086 ZFCP_STATUS_COMMON_ERP_FAILED);
1087 }
1088 break;
1089 }
1090
1091 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1092 zfcp_erp_adapter_block(adapter, 0);
1093 result = ZFCP_ERP_EXIT;
1094 }
1095 return result;
1096}
1097
1098static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1099 int result)
1100{
1101 struct zfcp_adapter *adapter = erp_action->adapter;
1102 struct zfcp_port *port = erp_action->port;
1103 struct scsi_device *sdev = erp_action->sdev;
1104
1105 switch (erp_action->action) {
1106
1107 case ZFCP_ERP_ACTION_REOPEN_LUN:
1108 result = zfcp_erp_strategy_check_lun(sdev, result);
1109 break;
1110
1111 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1112 case ZFCP_ERP_ACTION_REOPEN_PORT:
1113 result = zfcp_erp_strategy_check_port(port, result);
1114 break;
1115
1116 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1117 result = zfcp_erp_strategy_check_adapter(adapter, result);
1118 break;
1119 }
1120 return result;
1121}
1122
1123static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1124{
1125 int status = atomic_read(target_status);
1126
1127 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1128 (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1129 return 1;
1130
1131 if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1132 !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1133 return 1;
1134
1135 return 0;
1136}
1137
1138static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1139{
1140 int action = act->action;
1141 struct zfcp_adapter *adapter = act->adapter;
1142 struct zfcp_port *port = act->port;
1143 struct scsi_device *sdev = act->sdev;
1144 struct zfcp_scsi_dev *zfcp_sdev;
1145 u32 erp_status = act->status;
1146
1147 switch (action) {
1148 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1149 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1150 _zfcp_erp_adapter_reopen(adapter,
1151 ZFCP_STATUS_COMMON_ERP_FAILED,
1152 "ersscg1");
1153 return ZFCP_ERP_EXIT;
1154 }
1155 break;
1156
1157 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1158 case ZFCP_ERP_ACTION_REOPEN_PORT:
1159 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1160 _zfcp_erp_port_reopen(port,
1161 ZFCP_STATUS_COMMON_ERP_FAILED,
1162 "ersscg2");
1163 return ZFCP_ERP_EXIT;
1164 }
1165 break;
1166
1167 case ZFCP_ERP_ACTION_REOPEN_LUN:
1168 zfcp_sdev = sdev_to_zfcp(sdev);
1169 if (zfcp_erp_strat_change_det(&zfcp_sdev->status, erp_status)) {
1170 _zfcp_erp_lun_reopen(sdev,
1171 ZFCP_STATUS_COMMON_ERP_FAILED,
1172 "ersscg3", 0);
1173 return ZFCP_ERP_EXIT;
1174 }
1175 break;
1176 }
1177 return ret;
1178}
1179
1180static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1181{
1182 struct zfcp_adapter *adapter = erp_action->adapter;
1183 struct zfcp_scsi_dev *zfcp_sdev;
1184
1185 adapter->erp_total_count--;
1186 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1187 adapter->erp_low_mem_count--;
1188 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1189 }
1190
1191 list_del(&erp_action->list);
1192 zfcp_dbf_rec_run("eractd1", erp_action);
1193
1194 switch (erp_action->action) {
1195 case ZFCP_ERP_ACTION_REOPEN_LUN:
1196 zfcp_sdev = sdev_to_zfcp(erp_action->sdev);
1197 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1198 &zfcp_sdev->status);
1199 break;
1200
1201 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1202 case ZFCP_ERP_ACTION_REOPEN_PORT:
1203 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1204 &erp_action->port->status);
1205 break;
1206
1207 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1208 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1209 &erp_action->adapter->status);
1210 break;
1211 }
1212}
1213
1214static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1215{
1216 struct zfcp_adapter *adapter = act->adapter;
1217 struct zfcp_port *port = act->port;
1218 struct scsi_device *sdev = act->sdev;
1219
1220 switch (act->action) {
1221 case ZFCP_ERP_ACTION_REOPEN_LUN:
1222 if (!(act->status & ZFCP_STATUS_ERP_NO_REF))
1223 scsi_device_put(sdev);
1224 break;
1225
1226 case ZFCP_ERP_ACTION_REOPEN_PORT:
1227 if (result == ZFCP_ERP_SUCCEEDED)
1228 zfcp_scsi_schedule_rport_register(port);
1229
1230 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1231 put_device(&port->dev);
1232 break;
1233
1234 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1235 if (result == ZFCP_ERP_SUCCEEDED) {
1236 register_service_level(&adapter->service_level);
1237 zfcp_fc_conditional_port_scan(adapter);
1238 queue_work(adapter->work_queue, &adapter->ns_up_work);
1239 } else
1240 unregister_service_level(&adapter->service_level);
1241
1242 kref_put(&adapter->ref, zfcp_adapter_release);
1243 break;
1244 }
1245}
1246
1247static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1248{
1249 switch (erp_action->action) {
1250 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1251 return zfcp_erp_adapter_strategy(erp_action);
1252 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1253 return zfcp_erp_port_forced_strategy(erp_action);
1254 case ZFCP_ERP_ACTION_REOPEN_PORT:
1255 return zfcp_erp_port_strategy(erp_action);
1256 case ZFCP_ERP_ACTION_REOPEN_LUN:
1257 return zfcp_erp_lun_strategy(erp_action);
1258 }
1259 return ZFCP_ERP_FAILED;
1260}
1261
1262static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1263{
1264 int retval;
1265 unsigned long flags;
1266 struct zfcp_adapter *adapter = erp_action->adapter;
1267
1268 kref_get(&adapter->ref);
1269
1270 write_lock_irqsave(&adapter->erp_lock, flags);
1271 zfcp_erp_strategy_check_fsfreq(erp_action);
1272
1273 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1274 zfcp_erp_action_dequeue(erp_action);
1275 retval = ZFCP_ERP_DISMISSED;
1276 goto unlock;
1277 }
1278
1279 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
1280 retval = ZFCP_ERP_FAILED;
1281 goto check_target;
1282 }
1283
1284 zfcp_erp_action_to_running(erp_action);
1285
1286
1287 write_unlock_irqrestore(&adapter->erp_lock, flags);
1288 retval = zfcp_erp_strategy_do_action(erp_action);
1289 write_lock_irqsave(&adapter->erp_lock, flags);
1290
1291 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1292 retval = ZFCP_ERP_CONTINUES;
1293
1294 switch (retval) {
1295 case ZFCP_ERP_NOMEM:
1296 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1297 ++adapter->erp_low_mem_count;
1298 erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1299 }
1300 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1301 _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1");
1302 else {
1303 zfcp_erp_strategy_memwait(erp_action);
1304 retval = ZFCP_ERP_CONTINUES;
1305 }
1306 goto unlock;
1307
1308 case ZFCP_ERP_CONTINUES:
1309 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1310 --adapter->erp_low_mem_count;
1311 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1312 }
1313 goto unlock;
1314 }
1315
1316check_target:
1317 retval = zfcp_erp_strategy_check_target(erp_action, retval);
1318 zfcp_erp_action_dequeue(erp_action);
1319 retval = zfcp_erp_strategy_statechange(erp_action, retval);
1320 if (retval == ZFCP_ERP_EXIT)
1321 goto unlock;
1322 if (retval == ZFCP_ERP_SUCCEEDED)
1323 zfcp_erp_strategy_followup_success(erp_action);
1324 if (retval == ZFCP_ERP_FAILED)
1325 zfcp_erp_strategy_followup_failed(erp_action);
1326
1327 unlock:
1328 write_unlock_irqrestore(&adapter->erp_lock, flags);
1329
1330 if (retval != ZFCP_ERP_CONTINUES)
1331 zfcp_erp_action_cleanup(erp_action, retval);
1332
1333 kref_put(&adapter->ref, zfcp_adapter_release);
1334 return retval;
1335}
1336
1337static int zfcp_erp_thread(void *data)
1338{
1339 struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1340 struct list_head *next;
1341 struct zfcp_erp_action *act;
1342 unsigned long flags;
1343
1344 for (;;) {
1345 wait_event_interruptible(adapter->erp_ready_wq,
1346 !list_empty(&adapter->erp_ready_head) ||
1347 kthread_should_stop());
1348
1349 if (kthread_should_stop())
1350 break;
1351
1352 write_lock_irqsave(&adapter->erp_lock, flags);
1353 next = adapter->erp_ready_head.next;
1354 write_unlock_irqrestore(&adapter->erp_lock, flags);
1355
1356 if (next != &adapter->erp_ready_head) {
1357 act = list_entry(next, struct zfcp_erp_action, list);
1358
1359
1360 if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1361 zfcp_erp_wakeup(adapter);
1362 }
1363 }
1364
1365 return 0;
1366}
1367
1368
1369
1370
1371
1372
1373
1374int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1375{
1376 struct task_struct *thread;
1377
1378 thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
1379 dev_name(&adapter->ccw_device->dev));
1380 if (IS_ERR(thread)) {
1381 dev_err(&adapter->ccw_device->dev,
1382 "Creating an ERP thread for the FCP device failed.\n");
1383 return PTR_ERR(thread);
1384 }
1385
1386 adapter->erp_thread = thread;
1387 return 0;
1388}
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1400{
1401 kthread_stop(adapter->erp_thread);
1402 adapter->erp_thread = NULL;
1403 WARN_ON(!list_empty(&adapter->erp_ready_head));
1404 WARN_ON(!list_empty(&adapter->erp_running_head));
1405}
1406
1407
1408
1409
1410
1411void zfcp_erp_wait(struct zfcp_adapter *adapter)
1412{
1413 wait_event(adapter->erp_done_wqh,
1414 !(atomic_read(&adapter->status) &
1415 ZFCP_STATUS_ADAPTER_ERP_PENDING));
1416}
1417
1418
1419
1420
1421
1422
1423
1424
1425void zfcp_erp_set_adapter_status(struct zfcp_adapter *adapter, u32 mask)
1426{
1427 struct zfcp_port *port;
1428 struct scsi_device *sdev;
1429 unsigned long flags;
1430 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1431
1432 atomic_set_mask(mask, &adapter->status);
1433
1434 if (!common_mask)
1435 return;
1436
1437 read_lock_irqsave(&adapter->port_list_lock, flags);
1438 list_for_each_entry(port, &adapter->port_list, list)
1439 atomic_set_mask(common_mask, &port->status);
1440 read_unlock_irqrestore(&adapter->port_list_lock, flags);
1441
1442 spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
1443 __shost_for_each_device(sdev, adapter->scsi_host)
1444 atomic_set_mask(common_mask, &sdev_to_zfcp(sdev)->status);
1445 spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
1446}
1447
1448
1449
1450
1451
1452
1453
1454
1455void zfcp_erp_clear_adapter_status(struct zfcp_adapter *adapter, u32 mask)
1456{
1457 struct zfcp_port *port;
1458 struct scsi_device *sdev;
1459 unsigned long flags;
1460 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1461 u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
1462
1463 atomic_clear_mask(mask, &adapter->status);
1464
1465 if (!common_mask)
1466 return;
1467
1468 if (clear_counter)
1469 atomic_set(&adapter->erp_counter, 0);
1470
1471 read_lock_irqsave(&adapter->port_list_lock, flags);
1472 list_for_each_entry(port, &adapter->port_list, list) {
1473 atomic_clear_mask(common_mask, &port->status);
1474 if (clear_counter)
1475 atomic_set(&port->erp_counter, 0);
1476 }
1477 read_unlock_irqrestore(&adapter->port_list_lock, flags);
1478
1479 spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
1480 __shost_for_each_device(sdev, adapter->scsi_host) {
1481 atomic_clear_mask(common_mask, &sdev_to_zfcp(sdev)->status);
1482 if (clear_counter)
1483 atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
1484 }
1485 spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
1486}
1487
1488
1489
1490
1491
1492
1493
1494
1495void zfcp_erp_set_port_status(struct zfcp_port *port, u32 mask)
1496{
1497 struct scsi_device *sdev;
1498 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1499 unsigned long flags;
1500
1501 atomic_set_mask(mask, &port->status);
1502
1503 if (!common_mask)
1504 return;
1505
1506 spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
1507 __shost_for_each_device(sdev, port->adapter->scsi_host)
1508 if (sdev_to_zfcp(sdev)->port == port)
1509 atomic_set_mask(common_mask,
1510 &sdev_to_zfcp(sdev)->status);
1511 spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
1512}
1513
1514
1515
1516
1517
1518
1519
1520
1521void zfcp_erp_clear_port_status(struct zfcp_port *port, u32 mask)
1522{
1523 struct scsi_device *sdev;
1524 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1525 u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
1526 unsigned long flags;
1527
1528 atomic_clear_mask(mask, &port->status);
1529
1530 if (!common_mask)
1531 return;
1532
1533 if (clear_counter)
1534 atomic_set(&port->erp_counter, 0);
1535
1536 spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
1537 __shost_for_each_device(sdev, port->adapter->scsi_host)
1538 if (sdev_to_zfcp(sdev)->port == port) {
1539 atomic_clear_mask(common_mask,
1540 &sdev_to_zfcp(sdev)->status);
1541 if (clear_counter)
1542 atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
1543 }
1544 spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
1545}
1546
1547
1548
1549
1550
1551
1552void zfcp_erp_set_lun_status(struct scsi_device *sdev, u32 mask)
1553{
1554 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1555
1556 atomic_set_mask(mask, &zfcp_sdev->status);
1557}
1558
1559
1560
1561
1562
1563
1564void zfcp_erp_clear_lun_status(struct scsi_device *sdev, u32 mask)
1565{
1566 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1567
1568 atomic_clear_mask(mask, &zfcp_sdev->status);
1569
1570 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1571 atomic_set(&zfcp_sdev->erp_counter, 0);
1572}
1573
1574
