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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
15#define ZFCP_MAX_ERPS 3
16
17enum zfcp_erp_act_flags {
18 ZFCP_STATUS_ERP_TIMEDOUT = 0x10000000,
19 ZFCP_STATUS_ERP_CLOSE_ONLY = 0x01000000,
20 ZFCP_STATUS_ERP_DISMISSING = 0x00100000,
21 ZFCP_STATUS_ERP_DISMISSED = 0x00200000,
22 ZFCP_STATUS_ERP_LOWMEM = 0x00400000,
23};
24
25enum zfcp_erp_steps {
26 ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
27 ZFCP_ERP_STEP_FSF_XCONFIG = 0x0001,
28 ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
29 ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
30 ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
31 ZFCP_ERP_STEP_UNIT_CLOSING = 0x1000,
32 ZFCP_ERP_STEP_UNIT_OPENING = 0x2000,
33};
34
35enum zfcp_erp_act_type {
36 ZFCP_ERP_ACTION_REOPEN_UNIT = 1,
37 ZFCP_ERP_ACTION_REOPEN_PORT = 2,
38 ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
39 ZFCP_ERP_ACTION_REOPEN_ADAPTER = 4,
40};
41
42enum zfcp_erp_act_state {
43 ZFCP_ERP_ACTION_RUNNING = 1,
44 ZFCP_ERP_ACTION_READY = 2,
45};
46
47enum zfcp_erp_act_result {
48 ZFCP_ERP_SUCCEEDED = 0,
49 ZFCP_ERP_FAILED = 1,
50 ZFCP_ERP_CONTINUES = 2,
51 ZFCP_ERP_EXIT = 3,
52 ZFCP_ERP_DISMISSED = 4,
53 ZFCP_ERP_NOMEM = 5,
54};
55
56static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
57{
58 zfcp_erp_modify_adapter_status(adapter, "erablk1", NULL,
59 ZFCP_STATUS_COMMON_UNBLOCKED | mask,
60 ZFCP_CLEAR);
61}
62
63static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
64{
65 struct zfcp_erp_action *curr_act;
66
67 list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
68 if (act == curr_act)
69 return ZFCP_ERP_ACTION_RUNNING;
70 return 0;
71}
72
73static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
74{
75 struct zfcp_adapter *adapter = act->adapter;
76
77 list_move(&act->list, &act->adapter->erp_ready_head);
78 zfcp_dbf_rec_action("erardy1", act);
79 wake_up(&adapter->erp_ready_wq);
80 zfcp_dbf_rec_thread("erardy2", adapter->dbf);
81}
82
83static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
84{
85 act->status |= ZFCP_STATUS_ERP_DISMISSED;
86 if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
87 zfcp_erp_action_ready(act);
88}
89
90static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
91{
92 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
93 zfcp_erp_action_dismiss(&unit->erp_action);
94}
95
96static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
97{
98 struct zfcp_unit *unit;
99
100 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
101 zfcp_erp_action_dismiss(&port->erp_action);
102 else
103 list_for_each_entry(unit, &port->unit_list_head, list)
104 zfcp_erp_action_dismiss_unit(unit);
105}
106
107static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
108{
109 struct zfcp_port *port;
110
111 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
112 zfcp_erp_action_dismiss(&adapter->erp_action);
113 else
114 list_for_each_entry(port, &adapter->port_list_head, list)
115 zfcp_erp_action_dismiss_port(port);
116}
117
118static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
119 struct zfcp_port *port,
120 struct zfcp_unit *unit)
121{
122 int need = want;
123 int u_status, p_status, a_status;
124
125 switch (want) {
126 case ZFCP_ERP_ACTION_REOPEN_UNIT:
127 u_status = atomic_read(&unit->status);
128 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
129 return 0;
130 p_status = atomic_read(&port->status);
131 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
132 p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
133 return 0;
134 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
135 need = ZFCP_ERP_ACTION_REOPEN_PORT;
136
137 case ZFCP_ERP_ACTION_REOPEN_PORT:
138 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
139 p_status = atomic_read(&port->status);
140 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
141 return 0;
142 a_status = atomic_read(&adapter->status);
143 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
144 a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
145 return 0;
146 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
147 need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
148
149 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
150 a_status = atomic_read(&adapter->status);
151 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
152 return 0;
153 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
154 !(a_status & ZFCP_STATUS_COMMON_OPEN))
155 return 0;
156 }
157
158 return need;
159}
160
161static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
162 struct zfcp_adapter *adapter,
163 struct zfcp_port *port,
164 struct zfcp_unit *unit)
165{
166 struct zfcp_erp_action *erp_action;
167 u32 status = 0;
168
169 switch (need) {
170 case ZFCP_ERP_ACTION_REOPEN_UNIT:
171 zfcp_unit_get(unit);
172 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
173 erp_action = &unit->erp_action;
174 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
175 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
176 break;
177
178 case ZFCP_ERP_ACTION_REOPEN_PORT:
179 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
180 zfcp_port_get(port);
181 zfcp_erp_action_dismiss_port(port);
182 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
183 erp_action = &port->erp_action;
184 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
185 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
186 break;
187
188 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
189 zfcp_adapter_get(adapter);
190 zfcp_erp_action_dismiss_adapter(adapter);
191 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
192 erp_action = &adapter->erp_action;
193 if (!(atomic_read(&adapter->status) &
194 ZFCP_STATUS_COMMON_RUNNING))
195 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
196 break;
197
198 default:
199 return NULL;
200 }
201
202 memset(erp_action, 0, sizeof(struct zfcp_erp_action));
203 erp_action->adapter = adapter;
204 erp_action->port = port;
205 erp_action->unit = unit;
206 erp_action->action = need;
207 erp_action->status = status;
208
209 return erp_action;
210}
211
212static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
213 struct zfcp_port *port,
214 struct zfcp_unit *unit, char *id, void *ref)
215{
216 int retval = 1, need;
217 struct zfcp_erp_action *act = NULL;
218
219 if (!adapter->erp_thread)
220 return -EIO;
221
222 need = zfcp_erp_required_act(want, adapter, port, unit);
223 if (!need)
224 goto out;
225
226 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
227 act = zfcp_erp_setup_act(need, adapter, port, unit);
228 if (!act)
229 goto out;
230 ++adapter->erp_total_count;
231 list_add_tail(&act->list, &adapter->erp_ready_head);
232 wake_up(&adapter->erp_ready_wq);
233 zfcp_dbf_rec_thread("eracte1", adapter->dbf);
234 retval = 0;
235 out:
236 zfcp_dbf_rec_trigger(id, ref, want, need, act, adapter, port, unit);
237 return retval;
238}
239
240static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
241 int clear_mask, char *id, void *ref)
242{
243 zfcp_erp_adapter_block(adapter, clear_mask);
244 zfcp_scsi_schedule_rports_block(adapter);
245
246
247 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
248 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
249 return -EIO;
250 }
251 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
252 adapter, NULL, NULL, id, ref);
253}
254
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258
259
260
261
262void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
263 char *id, void *ref)
264{
265 unsigned long flags;
266
267 read_lock_irqsave(&zfcp_data.config_lock, flags);
268 write_lock(&adapter->erp_lock);
269 _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
270 write_unlock(&adapter->erp_lock);
271 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
272}
273
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275
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277
278
279
280
281void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
282 char *id, void *ref)
283{
284 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
285 zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
286}
287
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291
292
293
294
295void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id,
296 void *ref)
297{
298 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
299 zfcp_erp_port_reopen(port, clear | flags, id, ref);
300}
301
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305
306
307
308
309void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
310 void *ref)
311{
312 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
313 zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
314}
315
316static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
317{
318 zfcp_erp_modify_port_status(port, "erpblk1", NULL,
319 ZFCP_STATUS_COMMON_UNBLOCKED | clear,
320 ZFCP_CLEAR);
321}
322
323static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
324 int clear, char *id, void *ref)
325{
326 zfcp_erp_port_block(port, clear);
327 zfcp_scsi_schedule_rport_block(port);
328
329 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
330 return;
331
332 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
333 port->adapter, port, NULL, id, ref);
334}
335
336
337
338
339
340
341
342void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id,
343 void *ref)
344{
345 unsigned long flags;
346 struct zfcp_adapter *adapter = port->adapter;
347
348 read_lock_irqsave(&zfcp_data.config_lock, flags);
349 write_lock(&adapter->erp_lock);
350 _zfcp_erp_port_forced_reopen(port, clear, id, ref);
351 write_unlock(&adapter->erp_lock);
352 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
353}
354
355static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id,
356 void *ref)
357{
358 zfcp_erp_port_block(port, clear);
359 zfcp_scsi_schedule_rport_block(port);
360
361 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
362
363 zfcp_erp_port_failed(port, "erpreo1", NULL);
364 return -EIO;
365 }
366
367 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
368 port->adapter, port, NULL, id, ref);
369}
370
371
372
373
374
375
376
377
378int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
379{
380 unsigned long flags;
381 int retval;
382 struct zfcp_adapter *adapter = port->adapter;
383
384 read_lock_irqsave(&zfcp_data.config_lock, flags);
385 write_lock(&adapter->erp_lock);
386 retval = _zfcp_erp_port_reopen(port, clear, id, ref);
387 write_unlock(&adapter->erp_lock);
388 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
389
390 return retval;
391}
392
393static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
394{
395 zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
396 ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
397 ZFCP_CLEAR);
398}
399
400static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
401 void *ref)
402{
403 struct zfcp_adapter *adapter = unit->port->adapter;
404
405 zfcp_erp_unit_block(unit, clear);
406
407 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
408 return;
409
410 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
411 adapter, unit->port, unit, id, ref);
412}
413
414
415
416
417
418
419
420void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
421 void *ref)
422{
423 unsigned long flags;
424 struct zfcp_port *port = unit->port;
425 struct zfcp_adapter *adapter = port->adapter;
426
427 read_lock_irqsave(&zfcp_data.config_lock, flags);
428 write_lock(&adapter->erp_lock);
429 _zfcp_erp_unit_reopen(unit, clear, id, ref);
430 write_unlock(&adapter->erp_lock);
431 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
432}
433
434static int status_change_set(unsigned long mask, atomic_t *status)
435{
436 return (atomic_read(status) ^ mask) & mask;
437}
438
439static int status_change_clear(unsigned long mask, atomic_t *status)
440{
441 return atomic_read(status) & mask;
442}
443
444static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
445{
446 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
447 zfcp_dbf_rec_adapter("eraubl1", NULL, adapter->dbf);
448 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
449}
450
451static void zfcp_erp_port_unblock(struct zfcp_port *port)
452{
453 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
454 zfcp_dbf_rec_port("erpubl1", NULL, port);
455 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
456}
457
458static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
459{
460 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
461 zfcp_dbf_rec_unit("eruubl1", NULL, unit);
462 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
463}
464
465static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
466{
467 list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
468 zfcp_dbf_rec_action("erator1", erp_action);
469}
470
471static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
472{
473 struct zfcp_adapter *adapter = act->adapter;
474
475 if (!act->fsf_req)
476 return;
477
478 spin_lock(&adapter->req_list_lock);
479 if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
480 act->fsf_req->erp_action == act) {
481 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
482 ZFCP_STATUS_ERP_TIMEDOUT)) {
483 act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
484 zfcp_dbf_rec_action("erscf_1", act);
485 act->fsf_req->erp_action = NULL;
486 }
487 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
488 zfcp_dbf_rec_action("erscf_2", act);
489 if (act->fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
490 act->fsf_req = NULL;
491 } else
492 act->fsf_req = NULL;
493 spin_unlock(&adapter->req_list_lock);
494}
495
496
497
498
499
500
501void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
502{
503 struct zfcp_adapter *adapter = erp_action->adapter;
504 unsigned long flags;
505
506 write_lock_irqsave(&adapter->erp_lock, flags);
507 if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
508 erp_action->status |= set_mask;
509 zfcp_erp_action_ready(erp_action);
510 }
511 write_unlock_irqrestore(&adapter->erp_lock, flags);
512}
513
514
515
516
517
518void zfcp_erp_timeout_handler(unsigned long data)
519{
520 struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
521 zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
522}
523
524static void zfcp_erp_memwait_handler(unsigned long data)
525{
526 zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
527}
528
529static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
530{
531 init_timer(&erp_action->timer);
532 erp_action->timer.function = zfcp_erp_memwait_handler;
533 erp_action->timer.data = (unsigned long) erp_action;
534 erp_action->timer.expires = jiffies + HZ;
535 add_timer(&erp_action->timer);
536}
537
538static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
539 int clear, char *id, void *ref)
540{
541 struct zfcp_port *port;
542
543 list_for_each_entry(port, &adapter->port_list_head, list)
544 _zfcp_erp_port_reopen(port, clear, id, ref);
545}
546
547static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
548 char *id, void *ref)
549{
550 struct zfcp_unit *unit;
551
552 list_for_each_entry(unit, &port->unit_list_head, list)
553 _zfcp_erp_unit_reopen(unit, clear, id, ref);
554}
555
556static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
557{
558 switch (act->action) {
559 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
560 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1", NULL);
561 break;
562 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
563 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2", NULL);
564 break;
565 case ZFCP_ERP_ACTION_REOPEN_PORT:
566 _zfcp_erp_port_reopen(act->port, 0, "ersff_3", NULL);
567 break;
568 case ZFCP_ERP_ACTION_REOPEN_UNIT:
569 _zfcp_erp_unit_reopen(act->unit, 0, "ersff_4", NULL);
570 break;
571 }
572}
573
574static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
575{
576 switch (act->action) {
577 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
578 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1", NULL);
579 break;
580 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
581 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2", NULL);
582 break;
583 case ZFCP_ERP_ACTION_REOPEN_PORT:
584 _zfcp_erp_unit_reopen_all(act->port, 0, "ersfs_3", NULL);
585 break;
586 }
587}
588
589static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
590{
591 unsigned long flags;
592
593 read_lock_irqsave(&zfcp_data.config_lock, flags);
594 read_lock(&adapter->erp_lock);
595 if (list_empty(&adapter->erp_ready_head) &&
596 list_empty(&adapter->erp_running_head)) {
597 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
598 &adapter->status);
599 wake_up(&adapter->erp_done_wqh);
600 }
601 read_unlock(&adapter->erp_lock);
602 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
603}
604
605static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
606{
607 struct zfcp_qdio *qdio = act->adapter->qdio;
608
609 if (zfcp_qdio_open(qdio))
610 return ZFCP_ERP_FAILED;
611 init_waitqueue_head(&qdio->req_q_wq);
612 atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
613 return ZFCP_ERP_SUCCEEDED;
614}
615
616static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
617{
618 struct zfcp_port *port;
619 port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
620 adapter->peer_d_id);
621 if (IS_ERR(port))
622 return;
623 _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
624}
625
626static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
627{
628 int retries;
629 int sleep = 1;
630 struct zfcp_adapter *adapter = erp_action->adapter;
631
632 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
633
634 for (retries = 7; retries; retries--) {
635 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
636 &adapter->status);
637 write_lock_irq(&adapter->erp_lock);
638 zfcp_erp_action_to_running(erp_action);
639 write_unlock_irq(&adapter->erp_lock);
640 if (zfcp_fsf_exchange_config_data(erp_action)) {
641 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
642 &adapter->status);
643 return ZFCP_ERP_FAILED;
644 }
645
646 zfcp_dbf_rec_thread_lock("erasfx1", adapter->dbf);
647 wait_event(adapter->erp_ready_wq,
648 !list_empty(&adapter->erp_ready_head));
649 zfcp_dbf_rec_thread_lock("erasfx2", adapter->dbf);
650 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
651 break;
652
653 if (!(atomic_read(&adapter->status) &
654 ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
655 break;
656
657 ssleep(sleep);
658 sleep *= 2;
659 }
660
661 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
662 &adapter->status);
663
664 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
665 return ZFCP_ERP_FAILED;
666
667 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
668 zfcp_erp_enqueue_ptp_port(adapter);
669
670 return ZFCP_ERP_SUCCEEDED;
671}
672
673static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
674{
675 int ret;
676 struct zfcp_adapter *adapter = act->adapter;
677
678 write_lock_irq(&adapter->erp_lock);
679 zfcp_erp_action_to_running(act);
680 write_unlock_irq(&adapter->erp_lock);
681
682 ret = zfcp_fsf_exchange_port_data(act);
683 if (ret == -EOPNOTSUPP)
684 return ZFCP_ERP_SUCCEEDED;
685 if (ret)
686 return ZFCP_ERP_FAILED;
687
688 zfcp_dbf_rec_thread_lock("erasox1", adapter->dbf);
689 wait_event(adapter->erp_ready_wq,
690 !list_empty(&adapter->erp_ready_head));
691 zfcp_dbf_rec_thread_lock("erasox2", adapter->dbf);
692 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
693 return ZFCP_ERP_FAILED;
694
695 return ZFCP_ERP_SUCCEEDED;
696}
697
698static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
699{
700 if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
701 return ZFCP_ERP_FAILED;
702
703 if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
704 return ZFCP_ERP_FAILED;
705
706 atomic_set(&act->adapter->stat_miss, 16);
707 if (zfcp_status_read_refill(act->adapter))
708 return ZFCP_ERP_FAILED;
709
710 return ZFCP_ERP_SUCCEEDED;
711}
712
713static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
714{
715 struct zfcp_adapter *adapter = act->adapter;
716
717
718 zfcp_qdio_close(adapter->qdio);
719 zfcp_fsf_req_dismiss_all(adapter);
720 adapter->fsf_req_seq_no = 0;
721 zfcp_fc_wka_ports_force_offline(adapter->gs);
722
723 zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
724 ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
725
726 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
727 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
728}
729
730static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
731{
732 struct zfcp_adapter *adapter = act->adapter;
733
734 if (zfcp_erp_adapter_strategy_open_qdio(act)) {
735 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
736 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
737 &adapter->status);
738 return ZFCP_ERP_FAILED;
739 }
740
741 if (zfcp_erp_adapter_strategy_open_fsf(act)) {
742 zfcp_erp_adapter_strategy_close(act);
743 return ZFCP_ERP_FAILED;
744 }
745
746 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
747
748 return ZFCP_ERP_SUCCEEDED;
749}
750
751static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
752{
753 struct zfcp_adapter *adapter = act->adapter;
754
755 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
756 zfcp_erp_adapter_strategy_close(act);
757 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
758 return ZFCP_ERP_EXIT;
759 }
760
761 if (zfcp_erp_adapter_strategy_open(act)) {
762 ssleep(8);
763 return ZFCP_ERP_FAILED;
764 }
765
766 return ZFCP_ERP_SUCCEEDED;
767}
768
769static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
770{
771 int retval;
772
773 retval = zfcp_fsf_close_physical_port(act);
774 if (retval == -ENOMEM)
775 return ZFCP_ERP_NOMEM;
776 act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
777 if (retval)
778 return ZFCP_ERP_FAILED;
779
780 return ZFCP_ERP_CONTINUES;
781}
782
783static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
784{
785 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
786}
787
788static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
789{
790 struct zfcp_port *port = erp_action->port;
791 int status = atomic_read(&port->status);
792
793 switch (erp_action->step) {
794 case ZFCP_ERP_STEP_UNINITIALIZED:
795 zfcp_erp_port_strategy_clearstati(port);
796 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
797 (status & ZFCP_STATUS_COMMON_OPEN))
798 return zfcp_erp_port_forced_strategy_close(erp_action);
799 else
800 return ZFCP_ERP_FAILED;
801
802 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
803 if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
804 return ZFCP_ERP_SUCCEEDED;
805 }
806 return ZFCP_ERP_FAILED;
807}
808
809static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
810{
811 int retval;
812
813 retval = zfcp_fsf_close_port(erp_action);
814 if (retval == -ENOMEM)
815 return ZFCP_ERP_NOMEM;
816 erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
817 if (retval)
818 return ZFCP_ERP_FAILED;
819 return ZFCP_ERP_CONTINUES;
820}
821
822static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
823{
824 int retval;
825
826 retval = zfcp_fsf_open_port(erp_action);
827 if (retval == -ENOMEM)
828 return ZFCP_ERP_NOMEM;
829 erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
830 if (retval)
831 return ZFCP_ERP_FAILED;
832 return ZFCP_ERP_CONTINUES;
833}
834
835static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
836{
837 struct zfcp_adapter *adapter = act->adapter;
838 struct zfcp_port *port = act->port;
839
840 if (port->wwpn != adapter->peer_wwpn) {
841 zfcp_erp_port_failed(port, "eroptp1", NULL);
842 return ZFCP_ERP_FAILED;
843 }
844 port->d_id = adapter->peer_d_id;
845 return zfcp_erp_port_strategy_open_port(act);
846}
847
848static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
849{
850 struct zfcp_adapter *adapter = act->adapter;
851 struct zfcp_port *port = act->port;
852 int p_status = atomic_read(&port->status);
853
854 switch (act->step) {
855 case ZFCP_ERP_STEP_UNINITIALIZED:
856 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
857 case ZFCP_ERP_STEP_PORT_CLOSING:
858 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
859 return zfcp_erp_open_ptp_port(act);
860 if (!port->d_id) {
861 zfcp_fc_trigger_did_lookup(port);
862 return ZFCP_ERP_EXIT;
863 }
864 return zfcp_erp_port_strategy_open_port(act);
865
866 case ZFCP_ERP_STEP_PORT_OPENING:
867
868 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
869 if (!port->d_id) {
870 zfcp_fc_trigger_did_lookup(port);
871 return ZFCP_ERP_EXIT;
872 }
873 return ZFCP_ERP_SUCCEEDED;
874 }
875 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
876 port->d_id = 0;
877 _zfcp_erp_port_reopen(port, 0, "erpsoc1", NULL);
878 return ZFCP_ERP_EXIT;
879 }
880
881 }
882 return ZFCP_ERP_FAILED;
883}
884
885static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
886{
887 struct zfcp_port *port = erp_action->port;
888 int p_status = atomic_read(&port->status);
889
890 if ((p_status & ZFCP_STATUS_COMMON_NOESC) &&
891 !(p_status & ZFCP_STATUS_COMMON_OPEN))
892 goto close_init_done;
893
894 switch (erp_action->step) {
895 case ZFCP_ERP_STEP_UNINITIALIZED:
896 zfcp_erp_port_strategy_clearstati(port);
897 if (p_status & ZFCP_STATUS_COMMON_OPEN)
898 return zfcp_erp_port_strategy_close(erp_action);
899 break;
900
901 case ZFCP_ERP_STEP_PORT_CLOSING:
902 if (p_status & ZFCP_STATUS_COMMON_OPEN)
903 return ZFCP_ERP_FAILED;
904 break;
905 }
906
907close_init_done:
908 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
909 return ZFCP_ERP_EXIT;
910
911 return zfcp_erp_port_strategy_open_common(erp_action);
912}
913
914static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
915{
916 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
917 ZFCP_STATUS_UNIT_SHARED |
918 ZFCP_STATUS_UNIT_READONLY,
919 &unit->status);
920}
921
922static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
923{
924 int retval = zfcp_fsf_close_unit(erp_action);
925 if (retval == -ENOMEM)
926 return ZFCP_ERP_NOMEM;
927 erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
928 if (retval)
929 return ZFCP_ERP_FAILED;
930 return ZFCP_ERP_CONTINUES;
931}
932
933static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
934{
935 int retval = zfcp_fsf_open_unit(erp_action);
936 if (retval == -ENOMEM)
937 return ZFCP_ERP_NOMEM;
938 erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
939 if (retval)
940 return ZFCP_ERP_FAILED;
941 return ZFCP_ERP_CONTINUES;
942}
943
944static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
945{
946 struct zfcp_unit *unit = erp_action->unit;
947
948 switch (erp_action->step) {
949 case ZFCP_ERP_STEP_UNINITIALIZED:
950 zfcp_erp_unit_strategy_clearstati(unit);
951 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
952 return zfcp_erp_unit_strategy_close(erp_action);
953
954 case ZFCP_ERP_STEP_UNIT_CLOSING:
955 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
956 return ZFCP_ERP_FAILED;
957 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
958 return ZFCP_ERP_EXIT;
959 return zfcp_erp_unit_strategy_open(erp_action);
960
961 case ZFCP_ERP_STEP_UNIT_OPENING:
962 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
963 return ZFCP_ERP_SUCCEEDED;
964 }
965 return ZFCP_ERP_FAILED;
966}
967
968static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
969{
970 switch (result) {
971 case ZFCP_ERP_SUCCEEDED :
972 atomic_set(&unit->erp_counter, 0);
973 zfcp_erp_unit_unblock(unit);
974 break;
975 case ZFCP_ERP_FAILED :
976 atomic_inc(&unit->erp_counter);
977 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
978 dev_err(&unit->port->adapter->ccw_device->dev,
979 "ERP failed for unit 0x%016Lx on "
980 "port 0x%016Lx\n",
981 (unsigned long long)unit->fcp_lun,
982 (unsigned long long)unit->port->wwpn);
983 zfcp_erp_unit_failed(unit, "erusck1", NULL);
984 }
985 break;
986 }
987
988 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
989 zfcp_erp_unit_block(unit, 0);
990 result = ZFCP_ERP_EXIT;
991 }
992 return result;
993}
994
995static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
996{
997 switch (result) {
998 case ZFCP_ERP_SUCCEEDED :
999 atomic_set(&port->erp_counter, 0);
1000 zfcp_erp_port_unblock(port);
1001 break;
1002
1003 case ZFCP_ERP_FAILED :
1004 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1005 zfcp_erp_port_block(port, 0);
1006 result = ZFCP_ERP_EXIT;
1007 }
1008 atomic_inc(&port->erp_counter);
1009 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1010 dev_err(&port->adapter->ccw_device->dev,
1011 "ERP failed for remote port 0x%016Lx\n",
1012 (unsigned long long)port->wwpn);
1013 zfcp_erp_port_failed(port, "erpsck1", NULL);
1014 }
1015 break;
1016 }
1017
1018 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1019 zfcp_erp_port_block(port, 0);
1020 result = ZFCP_ERP_EXIT;
1021 }
1022 return result;
1023}
1024
1025static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1026 int result)
1027{
1028 switch (result) {
1029 case ZFCP_ERP_SUCCEEDED :
1030 atomic_set(&adapter->erp_counter, 0);
1031 zfcp_erp_adapter_unblock(adapter);
1032 break;
1033
1034 case ZFCP_ERP_FAILED :
1035 atomic_inc(&adapter->erp_counter);
1036 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1037 dev_err(&adapter->ccw_device->dev,
1038 "ERP cannot recover an error "
1039 "on the FCP device\n");
1040 zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1041 }
1042 break;
1043 }
1044
1045 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1046 zfcp_erp_adapter_block(adapter, 0);
1047 result = ZFCP_ERP_EXIT;
1048 }
1049 return result;
1050}
1051
1052static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1053 int result)
1054{
1055 struct zfcp_adapter *adapter = erp_action->adapter;
1056 struct zfcp_port *port = erp_action->port;
1057 struct zfcp_unit *unit = erp_action->unit;
1058
1059 switch (erp_action->action) {
1060
1061 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1062 result = zfcp_erp_strategy_check_unit(unit, result);
1063 break;
1064
1065 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1066 case ZFCP_ERP_ACTION_REOPEN_PORT:
1067 result = zfcp_erp_strategy_check_port(port, result);
1068 break;
1069
1070 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1071 result = zfcp_erp_strategy_check_adapter(adapter, result);
1072 break;
1073 }
1074 return result;
1075}
1076
1077static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1078{
1079 int status = atomic_read(target_status);
1080
1081 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1082 (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1083 return 1;
1084
1085 if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1086 !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1087 return 1;
1088
1089 return 0;
1090}
1091
1092static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1093{
1094 int action = act->action;
1095 struct zfcp_adapter *adapter = act->adapter;
1096 struct zfcp_port *port = act->port;
1097 struct zfcp_unit *unit = act->unit;
1098 u32 erp_status = act->status;
1099
1100 switch (action) {
1101 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1102 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1103 _zfcp_erp_adapter_reopen(adapter,
1104 ZFCP_STATUS_COMMON_ERP_FAILED,
1105 "ersscg1", NULL);
1106 return ZFCP_ERP_EXIT;
1107 }
1108 break;
1109
1110 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1111 case ZFCP_ERP_ACTION_REOPEN_PORT:
1112 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1113 _zfcp_erp_port_reopen(port,
1114 ZFCP_STATUS_COMMON_ERP_FAILED,
1115 "ersscg2", NULL);
1116 return ZFCP_ERP_EXIT;
1117 }
1118 break;
1119
1120 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1121 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1122 _zfcp_erp_unit_reopen(unit,
1123 ZFCP_STATUS_COMMON_ERP_FAILED,
1124 "ersscg3", NULL);
1125 return ZFCP_ERP_EXIT;
1126 }
1127 break;
1128 }
1129 return ret;
1130}
1131
1132static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1133{
1134 struct zfcp_adapter *adapter = erp_action->adapter;
1135
1136 adapter->erp_total_count--;
1137 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1138 adapter->erp_low_mem_count--;
1139 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1140 }
1141
1142 list_del(&erp_action->list);
1143 zfcp_dbf_rec_action("eractd1", erp_action);
1144
1145 switch (erp_action->action) {
1146 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1147 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1148 &erp_action->unit->status);
1149 break;
1150
1151 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1152 case ZFCP_ERP_ACTION_REOPEN_PORT:
1153 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1154 &erp_action->port->status);
1155 break;
1156
1157 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1158 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1159 &erp_action->adapter->status);
1160 break;
1161 }
1162}
1163
1164static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1165{
1166 struct zfcp_adapter *adapter = act->adapter;
1167 struct zfcp_port *port = act->port;
1168 struct zfcp_unit *unit = act->unit;
1169
1170 switch (act->action) {
1171 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1172 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1173 zfcp_unit_get(unit);
1174 if (scsi_queue_work(unit->port->adapter->scsi_host,
1175 &unit->scsi_work) <= 0)
1176 zfcp_unit_put(unit);
1177 }
1178 zfcp_unit_put(unit);
1179 break;
1180
1181 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1182 case ZFCP_ERP_ACTION_REOPEN_PORT:
1183 if (result == ZFCP_ERP_SUCCEEDED)
1184 zfcp_scsi_schedule_rport_register(port);
1185 zfcp_port_put(port);
1186 break;
1187
1188 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1189 if (result == ZFCP_ERP_SUCCEEDED) {
1190 register_service_level(&adapter->service_level);
1191 schedule_work(&adapter->scan_work);
1192 } else
1193 unregister_service_level(&adapter->service_level);
1194 zfcp_adapter_put(adapter);
1195 break;
1196 }
1197}
1198
1199static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1200{
1201 switch (erp_action->action) {
1202 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1203 return zfcp_erp_adapter_strategy(erp_action);
1204 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1205 return zfcp_erp_port_forced_strategy(erp_action);
1206 case ZFCP_ERP_ACTION_REOPEN_PORT:
1207 return zfcp_erp_port_strategy(erp_action);
1208 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1209 return zfcp_erp_unit_strategy(erp_action);
1210 }
1211 return ZFCP_ERP_FAILED;
1212}
1213
1214static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1215{
1216 int retval;
1217 struct zfcp_adapter *adapter = erp_action->adapter;
1218 unsigned long flags;
1219
1220 read_lock_irqsave(&zfcp_data.config_lock, flags);
1221 write_lock(&adapter->erp_lock);
1222
1223 zfcp_erp_strategy_check_fsfreq(erp_action);
1224
1225 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1226 zfcp_erp_action_dequeue(erp_action);
1227 retval = ZFCP_ERP_DISMISSED;
1228 goto unlock;
1229 }
1230
1231 zfcp_erp_action_to_running(erp_action);
1232
1233
1234 write_unlock(&adapter->erp_lock);
1235 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1236 retval = zfcp_erp_strategy_do_action(erp_action);
1237 read_lock_irqsave(&zfcp_data.config_lock, flags);
1238 write_lock(&adapter->erp_lock);
1239
1240 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1241 retval = ZFCP_ERP_CONTINUES;
1242
1243 switch (retval) {
1244 case ZFCP_ERP_NOMEM:
1245 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1246 ++adapter->erp_low_mem_count;
1247 erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1248 }
1249 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1250 _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1251 else {
1252 zfcp_erp_strategy_memwait(erp_action);
1253 retval = ZFCP_ERP_CONTINUES;
1254 }
1255 goto unlock;
1256
1257 case ZFCP_ERP_CONTINUES:
1258 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1259 --adapter->erp_low_mem_count;
1260 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1261 }
1262 goto unlock;
1263 }
1264
1265 retval = zfcp_erp_strategy_check_target(erp_action, retval);
1266 zfcp_erp_action_dequeue(erp_action);
1267 retval = zfcp_erp_strategy_statechange(erp_action, retval);
1268 if (retval == ZFCP_ERP_EXIT)
1269 goto unlock;
1270 if (retval == ZFCP_ERP_SUCCEEDED)
1271 zfcp_erp_strategy_followup_success(erp_action);
1272 if (retval == ZFCP_ERP_FAILED)
1273 zfcp_erp_strategy_followup_failed(erp_action);
1274
1275 unlock:
1276 write_unlock(&adapter->erp_lock);
1277 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1278
1279 if (retval != ZFCP_ERP_CONTINUES)
1280 zfcp_erp_action_cleanup(erp_action, retval);
1281
1282 return retval;
1283}
1284
1285static int zfcp_erp_thread(void *data)
1286{
1287 struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1288 struct list_head *next;
1289 struct zfcp_erp_action *act;
1290 unsigned long flags;
1291
1292 for (;;) {
1293 zfcp_dbf_rec_thread_lock("erthrd1", adapter->dbf);
1294 wait_event_interruptible(adapter->erp_ready_wq,
1295 !list_empty(&adapter->erp_ready_head) ||
1296 kthread_should_stop());
1297 zfcp_dbf_rec_thread_lock("erthrd2", adapter->dbf);
1298
1299 if (kthread_should_stop())
1300 break;
1301
1302 write_lock_irqsave(&adapter->erp_lock, flags);
1303 next = adapter->erp_ready_head.next;
1304 write_unlock_irqrestore(&adapter->erp_lock, flags);
1305
1306 if (next != &adapter->erp_ready_head) {
1307 act = list_entry(next, struct zfcp_erp_action, list);
1308
1309
1310 if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1311 zfcp_erp_wakeup(adapter);
1312 }
1313 }
1314
1315 return 0;
1316}
1317
1318
1319
1320
1321
1322
1323
1324int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1325{
1326 struct task_struct *thread;
1327
1328 thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
1329 dev_name(&adapter->ccw_device->dev));
1330 if (IS_ERR(thread)) {
1331 dev_err(&adapter->ccw_device->dev,
1332 "Creating an ERP thread for the FCP device failed.\n");
1333 return PTR_ERR(thread);
1334 }
1335
1336 adapter->erp_thread = thread;
1337 return 0;
1338}
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1350{
1351 kthread_stop(adapter->erp_thread);
1352 adapter->erp_thread = NULL;
1353 WARN_ON(!list_empty(&adapter->erp_ready_head));
1354 WARN_ON(!list_empty(&adapter->erp_running_head));
1355}
1356
1357
1358
1359
1360
1361
1362
1363void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1364{
1365 zfcp_erp_modify_adapter_status(adapter, id, ref,
1366 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1367}
1368
1369
1370
1371
1372
1373
1374
1375void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1376{
1377 zfcp_erp_modify_port_status(port, id, ref,
1378 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1379}
1380
1381
1382
1383
1384
1385
1386
1387void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1388{
1389 zfcp_erp_modify_unit_status(unit, id, ref,
1390 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1391}
1392
1393
1394
1395
1396
1397void zfcp_erp_wait(struct zfcp_adapter *adapter)
1398{
1399 wait_event(adapter->erp_done_wqh,
1400 !(atomic_read(&adapter->status) &
1401 ZFCP_STATUS_ADAPTER_ERP_PENDING));
1402}
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1415 void *ref, u32 mask, int set_or_clear)
1416{
1417 struct zfcp_port *port;
1418 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1419
1420 if (set_or_clear == ZFCP_SET) {
1421 if (status_change_set(mask, &adapter->status))
1422 zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1423 atomic_set_mask(mask, &adapter->status);
1424 } else {
1425 if (status_change_clear(mask, &adapter->status))
1426 zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1427 atomic_clear_mask(mask, &adapter->status);
1428 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1429 atomic_set(&adapter->erp_counter, 0);
1430 }
1431
1432 if (common_mask)
1433 list_for_each_entry(port, &adapter->port_list_head, list)
1434 zfcp_erp_modify_port_status(port, id, ref, common_mask,
1435 set_or_clear);
1436}
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1449 u32 mask, int set_or_clear)
1450{
1451 struct zfcp_unit *unit;
1452 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1453
1454 if (set_or_clear == ZFCP_SET) {
1455 if (status_change_set(mask, &port->status))
1456 zfcp_dbf_rec_port(id, ref, port);
1457 atomic_set_mask(mask, &port->status);
1458 } else {
1459 if (status_change_clear(mask, &port->status))
1460 zfcp_dbf_rec_port(id, ref, port);
1461 atomic_clear_mask(mask, &port->status);
1462 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1463 atomic_set(&port->erp_counter, 0);
1464 }
1465
1466 if (common_mask)
1467 list_for_each_entry(unit, &port->unit_list_head, list)
1468 zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1469 set_or_clear);
1470}
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1481 u32 mask, int set_or_clear)
1482{
1483 if (set_or_clear == ZFCP_SET) {
1484 if (status_change_set(mask, &unit->status))
1485 zfcp_dbf_rec_unit(id, ref, unit);
1486 atomic_set_mask(mask, &unit->status);
1487 } else {
1488 if (status_change_clear(mask, &unit->status))
1489 zfcp_dbf_rec_unit(id, ref, unit);
1490 atomic_clear_mask(mask, &unit->status);
1491 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1492 atomic_set(&unit->erp_counter, 0);
1493 }
1494 }
1495}
1496
1497
1498
1499
1500
1501
1502
1503void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1504{
1505 unsigned long flags;
1506
1507 read_lock_irqsave(&zfcp_data.config_lock, flags);
1508 zfcp_erp_modify_port_status(port, id, ref,
1509 ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1510 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1511 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1512}
1513
1514
1515
1516
1517
1518
1519
1520void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1521{
1522 zfcp_erp_modify_unit_status(unit, id, ref,
1523 ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1524 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1525}
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1537{
1538 unsigned long flags;
1539
1540 read_lock_irqsave(&zfcp_data.config_lock, flags);
1541 zfcp_erp_modify_port_status(port, id, ref,
1542 ZFCP_STATUS_COMMON_ERP_FAILED |
1543 ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1544 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1545}
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1556{
1557 zfcp_erp_modify_unit_status(unit, id, ref,
1558 ZFCP_STATUS_COMMON_ERP_FAILED |
1559 ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1560}
1561
1562static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1563 void *ref)
1564{
1565 int status = atomic_read(&unit->status);
1566 if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1567 ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1568 return;
1569
1570 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1571}
1572
1573static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1574 void *ref)
1575{
1576 struct zfcp_unit *unit;
1577 int status = atomic_read(&port->status);
1578
1579 if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1580 ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1581 list_for_each_entry(unit, &port->unit_list_head, list)
1582 zfcp_erp_unit_access_changed(unit, id, ref);
1583 return;
1584 }
1585
1586 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1587}
1588
1589
1590
1591
1592
1593
1594
1595void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1596 void *ref)
1597{
1598 struct zfcp_port *port;
1599 unsigned long flags;
1600
1601 if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1602 return;
1603
1604 read_lock_irqsave(&zfcp_data.config_lock, flags);
1605 list_for_each_entry(port, &adapter->port_list_head, list)
1606 zfcp_erp_port_access_changed(port, id, ref);
1607 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1608}
1609
