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[S390] convert zfcp printks to pr_xxx macros.
[deliverable/linux.git] / drivers / s390 / scsi / zfcp_erp.c
1 /*
2 * zfcp device driver
3 *
4 * Error Recovery Procedures (ERP).
5 *
6 * Copyright IBM Corporation 2002, 2008
7 */
8
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include "zfcp_ext.h"
13
14 #define ZFCP_MAX_ERPS 3
15
16 enum zfcp_erp_act_flags {
17 ZFCP_STATUS_ERP_TIMEDOUT = 0x10000000,
18 ZFCP_STATUS_ERP_CLOSE_ONLY = 0x01000000,
19 ZFCP_STATUS_ERP_DISMISSING = 0x00100000,
20 ZFCP_STATUS_ERP_DISMISSED = 0x00200000,
21 ZFCP_STATUS_ERP_LOWMEM = 0x00400000,
22 };
23
24 enum zfcp_erp_steps {
25 ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
26 ZFCP_ERP_STEP_FSF_XCONFIG = 0x0001,
27 ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
28 ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
29 ZFCP_ERP_STEP_NAMESERVER_LOOKUP = 0x0400,
30 ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
31 ZFCP_ERP_STEP_UNIT_CLOSING = 0x1000,
32 ZFCP_ERP_STEP_UNIT_OPENING = 0x2000,
33 };
34
35 enum 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
42 enum zfcp_erp_act_state {
43 ZFCP_ERP_ACTION_RUNNING = 1,
44 ZFCP_ERP_ACTION_READY = 2,
45 };
46
47 enum 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
56 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
57 {
58 zfcp_erp_modify_adapter_status(adapter, 15, NULL,
59 ZFCP_STATUS_COMMON_UNBLOCKED | mask,
60 ZFCP_CLEAR);
61 }
62
63 static 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
73 static 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_rec_dbf_event_action(146, act);
79 up(&adapter->erp_ready_sem);
80 zfcp_rec_dbf_event_thread(2, adapter);
81 }
82
83 static 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
90 static 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
96 static 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
107 static 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
118 static 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 /* fall through */
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 /* fall through */
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 }
154
155 return need;
156 }
157
158 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
159 struct zfcp_adapter *adapter,
160 struct zfcp_port *port,
161 struct zfcp_unit *unit)
162 {
163 struct zfcp_erp_action *erp_action;
164 u32 status = 0;
165
166 switch (need) {
167 case ZFCP_ERP_ACTION_REOPEN_UNIT:
168 zfcp_unit_get(unit);
169 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
170 erp_action = &unit->erp_action;
171 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
172 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
173 break;
174
175 case ZFCP_ERP_ACTION_REOPEN_PORT:
176 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
177 zfcp_port_get(port);
178 zfcp_erp_action_dismiss_port(port);
179 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
180 erp_action = &port->erp_action;
181 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
182 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
183 break;
184
185 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
186 zfcp_adapter_get(adapter);
187 zfcp_erp_action_dismiss_adapter(adapter);
188 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
189 erp_action = &adapter->erp_action;
190 if (!(atomic_read(&adapter->status) &
191 ZFCP_STATUS_COMMON_RUNNING))
192 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
193 break;
194
195 default:
196 return NULL;
197 }
198
199 memset(erp_action, 0, sizeof(struct zfcp_erp_action));
200 erp_action->adapter = adapter;
201 erp_action->port = port;
202 erp_action->unit = unit;
203 erp_action->action = need;
204 erp_action->status = status;
205
206 return erp_action;
207 }
208
209 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
210 struct zfcp_port *port,
211 struct zfcp_unit *unit, u8 id, void *ref)
212 {
213 int retval = 1, need;
214 struct zfcp_erp_action *act = NULL;
215
216 if (!(atomic_read(&adapter->status) &
217 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP))
218 return -EIO;
219
220 need = zfcp_erp_required_act(want, adapter, port, unit);
221 if (!need)
222 goto out;
223
224 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
225 act = zfcp_erp_setup_act(need, adapter, port, unit);
226 if (!act)
227 goto out;
228 ++adapter->erp_total_count;
229 list_add_tail(&act->list, &adapter->erp_ready_head);
230 up(&adapter->erp_ready_sem);
231 zfcp_rec_dbf_event_thread(1, adapter);
232 retval = 0;
233 out:
234 zfcp_rec_dbf_event_trigger(id, ref, want, need, act,
235 adapter, port, unit);
236 return retval;
237 }
238
239 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
240 int clear_mask, u8 id, void *ref)
241 {
242 zfcp_erp_adapter_block(adapter, clear_mask);
243
244 /* ensure propagation of failed status to new devices */
245 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
246 zfcp_erp_adapter_failed(adapter, 13, NULL);
247 return -EIO;
248 }
249 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
250 adapter, NULL, NULL, id, ref);
251 }
252
253 /**
254 * zfcp_erp_adapter_reopen - Reopen adapter.
255 * @adapter: Adapter to reopen.
256 * @clear: Status flags to clear.
257 * @id: Id for debug trace event.
258 * @ref: Reference for debug trace event.
259 */
260 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
261 u8 id, void *ref)
262 {
263 unsigned long flags;
264
265 read_lock_irqsave(&zfcp_data.config_lock, flags);
266 write_lock(&adapter->erp_lock);
267 _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
268 write_unlock(&adapter->erp_lock);
269 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
270 }
271
272 /**
273 * zfcp_erp_adapter_shutdown - Shutdown adapter.
274 * @adapter: Adapter to shut down.
275 * @clear: Status flags to clear.
276 * @id: Id for debug trace event.
277 * @ref: Reference for debug trace event.
278 */
279 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
280 u8 id, void *ref)
281 {
282 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
283 zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
284 }
285
286 /**
287 * zfcp_erp_port_shutdown - Shutdown port
288 * @port: Port to shut down.
289 * @clear: Status flags to clear.
290 * @id: Id for debug trace event.
291 * @ref: Reference for debug trace event.
292 */
293 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, u8 id, void *ref)
294 {
295 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
296 zfcp_erp_port_reopen(port, clear | flags, id, ref);
297 }
298
299 /**
300 * zfcp_erp_unit_shutdown - Shutdown unit
301 * @unit: Unit to shut down.
302 * @clear: Status flags to clear.
303 * @id: Id for debug trace event.
304 * @ref: Reference for debug trace event.
305 */
306 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, u8 id, void *ref)
307 {
308 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
309 zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
310 }
311
312 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
313 {
314 zfcp_erp_modify_port_status(port, 17, NULL,
315 ZFCP_STATUS_COMMON_UNBLOCKED | clear,
316 ZFCP_CLEAR);
317 }
318
319 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
320 int clear, u8 id, void *ref)
321 {
322 zfcp_erp_port_block(port, clear);
323
324 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
325 return;
326
327 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
328 port->adapter, port, NULL, id, ref);
329 }
330
331 /**
332 * zfcp_erp_port_forced_reopen - Forced close of port and open again
333 * @port: Port to force close and to reopen.
334 * @id: Id for debug trace event.
335 * @ref: Reference for debug trace event.
336 */
337 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, u8 id,
338 void *ref)
339 {
340 unsigned long flags;
341 struct zfcp_adapter *adapter = port->adapter;
342
343 read_lock_irqsave(&zfcp_data.config_lock, flags);
344 write_lock(&adapter->erp_lock);
345 _zfcp_erp_port_forced_reopen(port, clear, id, ref);
346 write_unlock(&adapter->erp_lock);
347 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
348 }
349
350 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, u8 id,
351 void *ref)
352 {
353 zfcp_erp_port_block(port, clear);
354
355 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
356 /* ensure propagation of failed status to new devices */
357 zfcp_erp_port_failed(port, 14, NULL);
358 return -EIO;
359 }
360
361 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
362 port->adapter, port, NULL, id, ref);
363 }
364
365 /**
366 * zfcp_erp_port_reopen - trigger remote port recovery
367 * @port: port to recover
368 * @clear_mask: flags in port status to be cleared
369 *
370 * Returns 0 if recovery has been triggered, < 0 if not.
371 */
372 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, u8 id, void *ref)
373 {
374 unsigned long flags;
375 int retval;
376 struct zfcp_adapter *adapter = port->adapter;
377
378 read_lock_irqsave(&zfcp_data.config_lock, flags);
379 write_lock(&adapter->erp_lock);
380 retval = _zfcp_erp_port_reopen(port, clear, id, ref);
381 write_unlock(&adapter->erp_lock);
382 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
383
384 return retval;
385 }
386
387 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
388 {
389 zfcp_erp_modify_unit_status(unit, 19, NULL,
390 ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
391 ZFCP_CLEAR);
392 }
393
394 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, u8 id,
395 void *ref)
396 {
397 struct zfcp_adapter *adapter = unit->port->adapter;
398
399 zfcp_erp_unit_block(unit, clear);
400
401 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
402 return;
403
404 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
405 adapter, unit->port, unit, id, ref);
406 }
407
408 /**
409 * zfcp_erp_unit_reopen - initiate reopen of a unit
410 * @unit: unit to be reopened
411 * @clear_mask: specifies flags in unit status to be cleared
412 * Return: 0 on success, < 0 on error
413 */
414 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, u8 id, void *ref)
415 {
416 unsigned long flags;
417 struct zfcp_port *port = unit->port;
418 struct zfcp_adapter *adapter = port->adapter;
419
420 read_lock_irqsave(&zfcp_data.config_lock, flags);
421 write_lock(&adapter->erp_lock);
422 _zfcp_erp_unit_reopen(unit, clear, id, ref);
423 write_unlock(&adapter->erp_lock);
424 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
425 }
426
427 static int status_change_set(unsigned long mask, atomic_t *status)
428 {
429 return (atomic_read(status) ^ mask) & mask;
430 }
431
432 static int status_change_clear(unsigned long mask, atomic_t *status)
433 {
434 return atomic_read(status) & mask;
435 }
436
437 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
438 {
439 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
440 zfcp_rec_dbf_event_adapter(16, NULL, adapter);
441 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
442 }
443
444 static void zfcp_erp_port_unblock(struct zfcp_port *port)
445 {
446 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
447 zfcp_rec_dbf_event_port(18, NULL, port);
448 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
449 }
450
451 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
452 {
453 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
454 zfcp_rec_dbf_event_unit(20, NULL, unit);
455 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
456 }
457
458 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
459 {
460 list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
461 zfcp_rec_dbf_event_action(145, erp_action);
462 }
463
464 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
465 {
466 struct zfcp_adapter *adapter = act->adapter;
467
468 if (!act->fsf_req)
469 return;
470
471 spin_lock(&adapter->req_list_lock);
472 if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
473 act->fsf_req->erp_action == act) {
474 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
475 ZFCP_STATUS_ERP_TIMEDOUT)) {
476 act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
477 zfcp_rec_dbf_event_action(142, act);
478 act->fsf_req->erp_action = NULL;
479 }
480 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
481 zfcp_rec_dbf_event_action(143, act);
482 if (act->fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
483 ZFCP_STATUS_FSFREQ_DISMISSED))
484 act->fsf_req = NULL;
485 } else
486 act->fsf_req = NULL;
487 spin_unlock(&adapter->req_list_lock);
488 }
489
490 /**
491 * zfcp_erp_notify - Trigger ERP action.
492 * @erp_action: ERP action to continue.
493 * @set_mask: ERP action status flags to set.
494 */
495 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
496 {
497 struct zfcp_adapter *adapter = erp_action->adapter;
498 unsigned long flags;
499
500 write_lock_irqsave(&adapter->erp_lock, flags);
501 if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
502 erp_action->status |= set_mask;
503 zfcp_erp_action_ready(erp_action);
504 }
505 write_unlock_irqrestore(&adapter->erp_lock, flags);
506 }
507
508 /**
509 * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
510 * @data: ERP action (from timer data)
511 */
512 void zfcp_erp_timeout_handler(unsigned long data)
513 {
514 struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
515 zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
516 }
517
518 static void zfcp_erp_memwait_handler(unsigned long data)
519 {
520 zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
521 }
522
523 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
524 {
525 init_timer(&erp_action->timer);
526 erp_action->timer.function = zfcp_erp_memwait_handler;
527 erp_action->timer.data = (unsigned long) erp_action;
528 erp_action->timer.expires = jiffies + HZ;
529 add_timer(&erp_action->timer);
530 }
531
532 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
533 int clear, u8 id, void *ref)
534 {
535 struct zfcp_port *port;
536
537 list_for_each_entry(port, &adapter->port_list_head, list)
538 _zfcp_erp_port_reopen(port, clear, id, ref);
539 }
540
541 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear, u8 id,
542 void *ref)
543 {
544 struct zfcp_unit *unit;
545
546 list_for_each_entry(unit, &port->unit_list_head, list)
547 _zfcp_erp_unit_reopen(unit, clear, id, ref);
548 }
549
550 static void zfcp_erp_strategy_followup_actions(struct zfcp_erp_action *act)
551 {
552 struct zfcp_adapter *adapter = act->adapter;
553 struct zfcp_port *port = act->port;
554 struct zfcp_unit *unit = act->unit;
555 u32 status = act->status;
556
557 /* initiate follow-up actions depending on success of finished action */
558 switch (act->action) {
559
560 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
561 if (status == ZFCP_ERP_SUCCEEDED)
562 _zfcp_erp_port_reopen_all(adapter, 0, 70, NULL);
563 else
564 _zfcp_erp_adapter_reopen(adapter, 0, 71, NULL);
565 break;
566
567 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
568 if (status == ZFCP_ERP_SUCCEEDED)
569 _zfcp_erp_port_reopen(port, 0, 72, NULL);
570 else
571 _zfcp_erp_adapter_reopen(adapter, 0, 73, NULL);
572 break;
573
574 case ZFCP_ERP_ACTION_REOPEN_PORT:
575 if (status == ZFCP_ERP_SUCCEEDED)
576 _zfcp_erp_unit_reopen_all(port, 0, 74, NULL);
577 else
578 _zfcp_erp_port_forced_reopen(port, 0, 75, NULL);
579 break;
580
581 case ZFCP_ERP_ACTION_REOPEN_UNIT:
582 if (status != ZFCP_ERP_SUCCEEDED)
583 _zfcp_erp_port_reopen(unit->port, 0, 76, NULL);
584 break;
585 }
586 }
587
588 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
589 {
590 unsigned long flags;
591
592 read_lock_irqsave(&zfcp_data.config_lock, flags);
593 read_lock(&adapter->erp_lock);
594 if (list_empty(&adapter->erp_ready_head) &&
595 list_empty(&adapter->erp_running_head)) {
596 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
597 &adapter->status);
598 wake_up(&adapter->erp_done_wqh);
599 }
600 read_unlock(&adapter->erp_lock);
601 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
602 }
603
604 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
605 {
606 if (zfcp_qdio_open(act->adapter))
607 return ZFCP_ERP_FAILED;
608 init_waitqueue_head(&act->adapter->request_wq);
609 atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
610 return ZFCP_ERP_SUCCEEDED;
611 }
612
613 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
614 {
615 struct zfcp_port *port;
616 port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
617 adapter->peer_d_id);
618 if (IS_ERR(port)) /* error or port already attached */
619 return;
620 _zfcp_erp_port_reopen(port, 0, 150, NULL);
621 }
622
623 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
624 {
625 int retries;
626 int sleep = 1;
627 struct zfcp_adapter *adapter = erp_action->adapter;
628
629 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
630
631 for (retries = 7; retries; retries--) {
632 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
633 &adapter->status);
634 write_lock_irq(&adapter->erp_lock);
635 zfcp_erp_action_to_running(erp_action);
636 write_unlock_irq(&adapter->erp_lock);
637 if (zfcp_fsf_exchange_config_data(erp_action)) {
638 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
639 &adapter->status);
640 return ZFCP_ERP_FAILED;
641 }
642
643 zfcp_rec_dbf_event_thread_lock(6, adapter);
644 down(&adapter->erp_ready_sem);
645 zfcp_rec_dbf_event_thread_lock(7, adapter);
646 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
647 break;
648
649 if (!(atomic_read(&adapter->status) &
650 ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
651 break;
652
653 ssleep(sleep);
654 sleep *= 2;
655 }
656
657 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
658 &adapter->status);
659
660 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
661 return ZFCP_ERP_FAILED;
662
663 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
664 zfcp_erp_enqueue_ptp_port(adapter);
665
666 return ZFCP_ERP_SUCCEEDED;
667 }
668
669 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
670 {
671 int ret;
672 struct zfcp_adapter *adapter = act->adapter;
673
674 write_lock_irq(&adapter->erp_lock);
675 zfcp_erp_action_to_running(act);
676 write_unlock_irq(&adapter->erp_lock);
677
678 ret = zfcp_fsf_exchange_port_data(act);
679 if (ret == -EOPNOTSUPP)
680 return ZFCP_ERP_SUCCEEDED;
681 if (ret)
682 return ZFCP_ERP_FAILED;
683
684 zfcp_rec_dbf_event_thread_lock(8, adapter);
685 down(&adapter->erp_ready_sem);
686 zfcp_rec_dbf_event_thread_lock(9, adapter);
687 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
688 return ZFCP_ERP_FAILED;
689
690 return ZFCP_ERP_SUCCEEDED;
691 }
692
693 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
694 {
695 if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
696 return ZFCP_ERP_FAILED;
697
698 if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
699 return ZFCP_ERP_FAILED;
700
701 atomic_set(&act->adapter->stat_miss, 16);
702 if (zfcp_status_read_refill(act->adapter))
703 return ZFCP_ERP_FAILED;
704
705 return ZFCP_ERP_SUCCEEDED;
706 }
707
708 static int zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *act,
709 int close)
710 {
711 int retval = ZFCP_ERP_SUCCEEDED;
712 struct zfcp_adapter *adapter = act->adapter;
713
714 if (close)
715 goto close_only;
716
717 retval = zfcp_erp_adapter_strategy_open_qdio(act);
718 if (retval != ZFCP_ERP_SUCCEEDED)
719 goto failed_qdio;
720
721 retval = zfcp_erp_adapter_strategy_open_fsf(act);
722 if (retval != ZFCP_ERP_SUCCEEDED)
723 goto failed_openfcp;
724
725 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &act->adapter->status);
726
727 return ZFCP_ERP_SUCCEEDED;
728
729 close_only:
730 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
731 &act->adapter->status);
732
733 failed_openfcp:
734 /* close queues to ensure that buffers are not accessed by adapter */
735 zfcp_qdio_close(adapter);
736 zfcp_fsf_req_dismiss_all(adapter);
737 adapter->fsf_req_seq_no = 0;
738 /* all ports and units are closed */
739 zfcp_erp_modify_adapter_status(adapter, 24, NULL,
740 ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
741 failed_qdio:
742 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
743 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
744 &act->adapter->status);
745 return retval;
746 }
747
748 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
749 {
750 int retval;
751
752 zfcp_erp_adapter_strategy_generic(act, 1); /* close */
753 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
754 return ZFCP_ERP_EXIT;
755
756 retval = zfcp_erp_adapter_strategy_generic(act, 0); /* open */
757
758 if (retval == ZFCP_ERP_FAILED)
759 ssleep(8);
760
761 return retval;
762 }
763
764 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
765 {
766 int retval;
767
768 retval = zfcp_fsf_close_physical_port(act);
769 if (retval == -ENOMEM)
770 return ZFCP_ERP_NOMEM;
771 act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
772 if (retval)
773 return ZFCP_ERP_FAILED;
774
775 return ZFCP_ERP_CONTINUES;
776 }
777
778 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
779 {
780 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
781 ZFCP_STATUS_PORT_PHYS_CLOSING |
782 ZFCP_STATUS_PORT_INVALID_WWPN,
783 &port->status);
784 }
785
786 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
787 {
788 struct zfcp_port *port = erp_action->port;
789 int status = atomic_read(&port->status);
790
791 switch (erp_action->step) {
792 case ZFCP_ERP_STEP_UNINITIALIZED:
793 zfcp_erp_port_strategy_clearstati(port);
794 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
795 (status & ZFCP_STATUS_COMMON_OPEN))
796 return zfcp_erp_port_forced_strategy_close(erp_action);
797 else
798 return ZFCP_ERP_FAILED;
799
800 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
801 if (status & ZFCP_STATUS_PORT_PHYS_OPEN)
802 return ZFCP_ERP_SUCCEEDED;
803 }
804 return ZFCP_ERP_FAILED;
805 }
806
807 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
808 {
809 int retval;
810
811 retval = zfcp_fsf_close_port(erp_action);
812 if (retval == -ENOMEM)
813 return ZFCP_ERP_NOMEM;
814 erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
815 if (retval)
816 return ZFCP_ERP_FAILED;
817 return ZFCP_ERP_CONTINUES;
818 }
819
820 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
821 {
822 int retval;
823
824 retval = zfcp_fsf_open_port(erp_action);
825 if (retval == -ENOMEM)
826 return ZFCP_ERP_NOMEM;
827 erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
828 if (retval)
829 return ZFCP_ERP_FAILED;
830 return ZFCP_ERP_CONTINUES;
831 }
832
833 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
834 {
835 struct zfcp_adapter *adapter = act->adapter;
836 struct zfcp_port *port = act->port;
837
838 if (port->wwpn != adapter->peer_wwpn) {
839 zfcp_erp_port_failed(port, 25, NULL);
840 return ZFCP_ERP_FAILED;
841 }
842 port->d_id = adapter->peer_d_id;
843 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
844 return zfcp_erp_port_strategy_open_port(act);
845 }
846
847 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
848 {
849 int retval;
850 struct zfcp_port *port = container_of(work, struct zfcp_port,
851 gid_pn_work);
852
853 retval = zfcp_fc_ns_gid_pn(&port->erp_action);
854 if (retval == -ENOMEM)
855 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_NOMEM);
856 port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
857 if (retval)
858 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_FAILED);
859
860 }
861
862 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
863 {
864 struct zfcp_adapter *adapter = act->adapter;
865 struct zfcp_port *port = act->port;
866 int p_status = atomic_read(&port->status);
867
868 switch (act->step) {
869 case ZFCP_ERP_STEP_UNINITIALIZED:
870 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
871 case ZFCP_ERP_STEP_PORT_CLOSING:
872 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
873 return zfcp_erp_open_ptp_port(act);
874 if (!(p_status & ZFCP_STATUS_PORT_DID_DID)) {
875 queue_work(zfcp_data.work_queue, &port->gid_pn_work);
876 return ZFCP_ERP_CONTINUES;
877 }
878 case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
879 if (!(p_status & ZFCP_STATUS_PORT_DID_DID)) {
880 if (p_status & (ZFCP_STATUS_PORT_INVALID_WWPN)) {
881 zfcp_erp_port_failed(port, 26, NULL);
882 return ZFCP_ERP_EXIT;
883 }
884 return ZFCP_ERP_FAILED;
885 }
886 return zfcp_erp_port_strategy_open_port(act);
887
888 case ZFCP_ERP_STEP_PORT_OPENING:
889 /* D_ID might have changed during open */
890 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
891 if (p_status & ZFCP_STATUS_PORT_DID_DID)
892 return ZFCP_ERP_SUCCEEDED;
893 else {
894 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
895 return ZFCP_ERP_CONTINUES;
896 }
897 /* fall through otherwise */
898 }
899 }
900 return ZFCP_ERP_FAILED;
901 }
902
903 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
904 {
905 struct zfcp_port *port = erp_action->port;
906
907 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
908 goto close_init_done;
909
910 switch (erp_action->step) {
911 case ZFCP_ERP_STEP_UNINITIALIZED:
912 zfcp_erp_port_strategy_clearstati(port);
913 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
914 return zfcp_erp_port_strategy_close(erp_action);
915 break;
916
917 case ZFCP_ERP_STEP_PORT_CLOSING:
918 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
919 return ZFCP_ERP_FAILED;
920 break;
921 }
922
923 close_init_done:
924 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
925 return ZFCP_ERP_EXIT;
926
927 return zfcp_erp_port_strategy_open_common(erp_action);
928 }
929
930 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
931 {
932 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
933 ZFCP_STATUS_UNIT_SHARED |
934 ZFCP_STATUS_UNIT_READONLY,
935 &unit->status);
936 }
937
938 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
939 {
940 int retval = zfcp_fsf_close_unit(erp_action);
941 if (retval == -ENOMEM)
942 return ZFCP_ERP_NOMEM;
943 erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
944 if (retval)
945 return ZFCP_ERP_FAILED;
946 return ZFCP_ERP_CONTINUES;
947 }
948
949 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
950 {
951 int retval = zfcp_fsf_open_unit(erp_action);
952 if (retval == -ENOMEM)
953 return ZFCP_ERP_NOMEM;
954 erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
955 if (retval)
956 return ZFCP_ERP_FAILED;
957 return ZFCP_ERP_CONTINUES;
958 }
959
960 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
961 {
962 struct zfcp_unit *unit = erp_action->unit;
963
964 switch (erp_action->step) {
965 case ZFCP_ERP_STEP_UNINITIALIZED:
966 zfcp_erp_unit_strategy_clearstati(unit);
967 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
968 return zfcp_erp_unit_strategy_close(erp_action);
969 /* already closed, fall through */
970 case ZFCP_ERP_STEP_UNIT_CLOSING:
971 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
972 return ZFCP_ERP_FAILED;
973 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
974 return ZFCP_ERP_EXIT;
975 return zfcp_erp_unit_strategy_open(erp_action);
976
977 case ZFCP_ERP_STEP_UNIT_OPENING:
978 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
979 return ZFCP_ERP_SUCCEEDED;
980 }
981 return ZFCP_ERP_FAILED;
982 }
983
984 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
985 {
986 switch (result) {
987 case ZFCP_ERP_SUCCEEDED :
988 atomic_set(&unit->erp_counter, 0);
989 zfcp_erp_unit_unblock(unit);
990 break;
991 case ZFCP_ERP_FAILED :
992 atomic_inc(&unit->erp_counter);
993 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
994 dev_err(&unit->port->adapter->ccw_device->dev,
995 "ERP failed for unit 0x%016Lx on "
996 "port 0x%016Lx\n",
997 (unsigned long long)unit->fcp_lun,
998 (unsigned long long)unit->port->wwpn);
999 zfcp_erp_unit_failed(unit, 21, NULL);
1000 }
1001 break;
1002 }
1003
1004 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1005 zfcp_erp_unit_block(unit, 0);
1006 result = ZFCP_ERP_EXIT;
1007 }
1008 return result;
1009 }
1010
1011 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1012 {
1013 switch (result) {
1014 case ZFCP_ERP_SUCCEEDED :
1015 atomic_set(&port->erp_counter, 0);
1016 zfcp_erp_port_unblock(port);
1017 break;
1018
1019 case ZFCP_ERP_FAILED :
1020 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1021 zfcp_erp_port_block(port, 0);
1022 result = ZFCP_ERP_EXIT;
1023 }
1024 atomic_inc(&port->erp_counter);
1025 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1026 dev_err(&port->adapter->ccw_device->dev,
1027 "ERP failed for remote port 0x%016Lx\n",
1028 (unsigned long long)port->wwpn);
1029 zfcp_erp_port_failed(port, 22, NULL);
1030 }
1031 break;
1032 }
1033
1034 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1035 zfcp_erp_port_block(port, 0);
1036 result = ZFCP_ERP_EXIT;
1037 }
1038 return result;
1039 }
1040
1041 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1042 int result)
1043 {
1044 switch (result) {
1045 case ZFCP_ERP_SUCCEEDED :
1046 atomic_set(&adapter->erp_counter, 0);
1047 zfcp_erp_adapter_unblock(adapter);
1048 break;
1049
1050 case ZFCP_ERP_FAILED :
1051 atomic_inc(&adapter->erp_counter);
1052 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1053 dev_err(&adapter->ccw_device->dev,
1054 "ERP cannot recover an error "
1055 "on the FCP device\n");
1056 zfcp_erp_adapter_failed(adapter, 23, NULL);
1057 }
1058 break;
1059 }
1060
1061 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1062 zfcp_erp_adapter_block(adapter, 0);
1063 result = ZFCP_ERP_EXIT;
1064 }
1065 return result;
1066 }
1067
1068 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1069 int result)
1070 {
1071 struct zfcp_adapter *adapter = erp_action->adapter;
1072 struct zfcp_port *port = erp_action->port;
1073 struct zfcp_unit *unit = erp_action->unit;
1074
1075 switch (erp_action->action) {
1076
1077 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1078 result = zfcp_erp_strategy_check_unit(unit, result);
1079 break;
1080
1081 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1082 case ZFCP_ERP_ACTION_REOPEN_PORT:
1083 result = zfcp_erp_strategy_check_port(port, result);
1084 break;
1085
1086 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1087 result = zfcp_erp_strategy_check_adapter(adapter, result);
1088 break;
1089 }
1090 return result;
1091 }
1092
1093 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1094 {
1095 int status = atomic_read(target_status);
1096
1097 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1098 (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1099 return 1; /* take it online */
1100
1101 if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1102 !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1103 return 1; /* take it offline */
1104
1105 return 0;
1106 }
1107
1108 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1109 {
1110 int action = act->action;
1111 struct zfcp_adapter *adapter = act->adapter;
1112 struct zfcp_port *port = act->port;
1113 struct zfcp_unit *unit = act->unit;
1114 u32 erp_status = act->status;
1115
1116 switch (action) {
1117 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1118 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1119 _zfcp_erp_adapter_reopen(adapter,
1120 ZFCP_STATUS_COMMON_ERP_FAILED,
1121 67, NULL);
1122 return ZFCP_ERP_EXIT;
1123 }
1124 break;
1125
1126 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1127 case ZFCP_ERP_ACTION_REOPEN_PORT:
1128 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1129 _zfcp_erp_port_reopen(port,
1130 ZFCP_STATUS_COMMON_ERP_FAILED,
1131 68, NULL);
1132 return ZFCP_ERP_EXIT;
1133 }
1134 break;
1135
1136 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1137 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1138 _zfcp_erp_unit_reopen(unit,
1139 ZFCP_STATUS_COMMON_ERP_FAILED,
1140 69, NULL);
1141 return ZFCP_ERP_EXIT;
1142 }
1143 break;
1144 }
1145 return ret;
1146 }
1147
1148 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1149 {
1150 struct zfcp_adapter *adapter = erp_action->adapter;
1151
1152 adapter->erp_total_count--;
1153 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1154 adapter->erp_low_mem_count--;
1155 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1156 }
1157
1158 list_del(&erp_action->list);
1159 zfcp_rec_dbf_event_action(144, erp_action);
1160
1161 switch (erp_action->action) {
1162 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1163 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1164 &erp_action->unit->status);
1165 break;
1166
1167 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1168 case ZFCP_ERP_ACTION_REOPEN_PORT:
1169 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1170 &erp_action->port->status);
1171 break;
1172
1173 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1174 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1175 &erp_action->adapter->status);
1176 break;
1177 }
1178 }
1179
1180 struct zfcp_erp_add_work {
1181 struct zfcp_unit *unit;
1182 struct work_struct work;
1183 };
1184
1185 static void zfcp_erp_scsi_scan(struct work_struct *work)
1186 {
1187 struct zfcp_erp_add_work *p =
1188 container_of(work, struct zfcp_erp_add_work, work);
1189 struct zfcp_unit *unit = p->unit;
1190 struct fc_rport *rport = unit->port->rport;
1191
1192 if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
1193 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
1194 scsilun_to_int((struct scsi_lun *)&unit->fcp_lun), 0);
1195 atomic_clear_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1196 zfcp_unit_put(unit);
1197 wake_up(&unit->port->adapter->erp_done_wqh);
1198 kfree(p);
1199 }
1200
1201 static void zfcp_erp_schedule_work(struct zfcp_unit *unit)
1202 {
1203 struct zfcp_erp_add_work *p;
1204
1205 p = kzalloc(sizeof(*p), GFP_KERNEL);
1206 if (!p) {
1207 dev_err(&unit->port->adapter->ccw_device->dev,
1208 "Registering unit 0x%016Lx on port 0x%016Lx failed\n",
1209 (unsigned long long)unit->fcp_lun,
1210 (unsigned long long)unit->port->wwpn);
1211 return;
1212 }
1213
1214 zfcp_unit_get(unit);
1215 atomic_set_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1216 INIT_WORK(&p->work, zfcp_erp_scsi_scan);
1217 p->unit = unit;
1218 queue_work(zfcp_data.work_queue, &p->work);
1219 }
1220
1221 static void zfcp_erp_rport_register(struct zfcp_port *port)
1222 {
1223 struct fc_rport_identifiers ids;
1224 ids.node_name = port->wwnn;
1225 ids.port_name = port->wwpn;
1226 ids.port_id = port->d_id;
1227 ids.roles = FC_RPORT_ROLE_FCP_TARGET;
1228 port->rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
1229 if (!port->rport) {
1230 dev_err(&port->adapter->ccw_device->dev,
1231 "Registering port 0x%016Lx failed\n",
1232 (unsigned long long)port->wwpn);
1233 return;
1234 }
1235
1236 scsi_target_unblock(&port->rport->dev);
1237 port->rport->maxframe_size = port->maxframe_size;
1238 port->rport->supported_classes = port->supported_classes;
1239 }
1240
1241 static void zfcp_erp_rports_del(struct zfcp_adapter *adapter)
1242 {
1243 struct zfcp_port *port;
1244 list_for_each_entry(port, &adapter->port_list_head, list) {
1245 if (!port->rport)
1246 continue;
1247 fc_remote_port_delete(port->rport);
1248 port->rport = NULL;
1249 }
1250 }
1251
1252 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1253 {
1254 struct zfcp_adapter *adapter = act->adapter;
1255 struct zfcp_port *port = act->port;
1256 struct zfcp_unit *unit = act->unit;
1257
1258 switch (act->action) {
1259 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1260 if ((result == ZFCP_ERP_SUCCEEDED) &&
1261 !unit->device && port->rport) {
1262 atomic_set_mask(ZFCP_STATUS_UNIT_REGISTERED,
1263 &unit->status);
1264 if (!(atomic_read(&unit->status) &
1265 ZFCP_STATUS_UNIT_SCSI_WORK_PENDING))
1266 zfcp_erp_schedule_work(unit);
1267 }
1268 zfcp_unit_put(unit);
1269 break;
1270
1271 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1272 case ZFCP_ERP_ACTION_REOPEN_PORT:
1273 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_NO_WWPN) {
1274 zfcp_port_put(port);
1275 return;
1276 }
1277 if ((result == ZFCP_ERP_SUCCEEDED) && !port->rport)
1278 zfcp_erp_rport_register(port);
1279 if ((result != ZFCP_ERP_SUCCEEDED) && port->rport) {
1280 fc_remote_port_delete(port->rport);
1281 port->rport = NULL;
1282 }
1283 zfcp_port_put(port);
1284 break;
1285
1286 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1287 if (result != ZFCP_ERP_SUCCEEDED) {
1288 unregister_service_level(&adapter->service_level);
1289 zfcp_erp_rports_del(adapter);
1290 } else {
1291 register_service_level(&adapter->service_level);
1292 schedule_work(&adapter->scan_work);
1293 }
1294 zfcp_adapter_put(adapter);
1295 break;
1296 }
1297 }
1298
1299 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1300 {
1301 switch (erp_action->action) {
1302 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1303 return zfcp_erp_adapter_strategy(erp_action);
1304 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1305 return zfcp_erp_port_forced_strategy(erp_action);
1306 case ZFCP_ERP_ACTION_REOPEN_PORT:
1307 return zfcp_erp_port_strategy(erp_action);
1308 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1309 return zfcp_erp_unit_strategy(erp_action);
1310 }
1311 return ZFCP_ERP_FAILED;
1312 }
1313
1314 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1315 {
1316 int retval;
1317 struct zfcp_adapter *adapter = erp_action->adapter;
1318 unsigned long flags;
1319
1320 read_lock_irqsave(&zfcp_data.config_lock, flags);
1321 write_lock(&adapter->erp_lock);
1322
1323 zfcp_erp_strategy_check_fsfreq(erp_action);
1324
1325 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1326 zfcp_erp_action_dequeue(erp_action);
1327 retval = ZFCP_ERP_DISMISSED;
1328 goto unlock;
1329 }
1330
1331 zfcp_erp_action_to_running(erp_action);
1332
1333 /* no lock to allow for blocking operations */
1334 write_unlock(&adapter->erp_lock);
1335 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1336 retval = zfcp_erp_strategy_do_action(erp_action);
1337 read_lock_irqsave(&zfcp_data.config_lock, flags);
1338 write_lock(&adapter->erp_lock);
1339
1340 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1341 retval = ZFCP_ERP_CONTINUES;
1342
1343 switch (retval) {
1344 case ZFCP_ERP_NOMEM:
1345 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1346 ++adapter->erp_low_mem_count;
1347 erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1348 }
1349 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1350 _zfcp_erp_adapter_reopen(adapter, 0, 66, NULL);
1351 else {
1352 zfcp_erp_strategy_memwait(erp_action);
1353 retval = ZFCP_ERP_CONTINUES;
1354 }
1355 goto unlock;
1356
1357 case ZFCP_ERP_CONTINUES:
1358 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1359 --adapter->erp_low_mem_count;
1360 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1361 }
1362 goto unlock;
1363 }
1364
1365 retval = zfcp_erp_strategy_check_target(erp_action, retval);
1366 zfcp_erp_action_dequeue(erp_action);
1367 retval = zfcp_erp_strategy_statechange(erp_action, retval);
1368 if (retval == ZFCP_ERP_EXIT)
1369 goto unlock;
1370 zfcp_erp_strategy_followup_actions(erp_action);
1371
1372 unlock:
1373 write_unlock(&adapter->erp_lock);
1374 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1375
1376 if (retval != ZFCP_ERP_CONTINUES)
1377 zfcp_erp_action_cleanup(erp_action, retval);
1378
1379 return retval;
1380 }
1381
1382 static int zfcp_erp_thread(void *data)
1383 {
1384 struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1385 struct list_head *next;
1386 struct zfcp_erp_action *act;
1387 unsigned long flags;
1388
1389 daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1390 /* Block all signals */
1391 siginitsetinv(&current->blocked, 0);
1392 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1393 wake_up(&adapter->erp_thread_wqh);
1394
1395 while (!(atomic_read(&adapter->status) &
1396 ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1397 write_lock_irqsave(&adapter->erp_lock, flags);
1398 next = adapter->erp_ready_head.next;
1399 write_unlock_irqrestore(&adapter->erp_lock, flags);
1400
1401 if (next != &adapter->erp_ready_head) {
1402 act = list_entry(next, struct zfcp_erp_action, list);
1403
1404 /* there is more to come after dismission, no notify */
1405 if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1406 zfcp_erp_wakeup(adapter);
1407 }
1408
1409 zfcp_rec_dbf_event_thread_lock(4, adapter);
1410 down_interruptible(&adapter->erp_ready_sem);
1411 zfcp_rec_dbf_event_thread_lock(5, adapter);
1412 }
1413
1414 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1415 wake_up(&adapter->erp_thread_wqh);
1416
1417 return 0;
1418 }
1419
1420 /**
1421 * zfcp_erp_thread_setup - Start ERP thread for adapter
1422 * @adapter: Adapter to start the ERP thread for
1423 *
1424 * Returns 0 on success or error code from kernel_thread()
1425 */
1426 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1427 {
1428 int retval;
1429
1430 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1431 retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1432 if (retval < 0) {
1433 dev_err(&adapter->ccw_device->dev,
1434 "Creating an ERP thread for the FCP device failed.\n");
1435 return retval;
1436 }
1437 wait_event(adapter->erp_thread_wqh,
1438 atomic_read(&adapter->status) &
1439 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1440 return 0;
1441 }
1442
1443 /**
1444 * zfcp_erp_thread_kill - Stop ERP thread.
1445 * @adapter: Adapter where the ERP thread should be stopped.
1446 *
1447 * The caller of this routine ensures that the specified adapter has
1448 * been shut down and that this operation has been completed. Thus,
1449 * there are no pending erp_actions which would need to be handled
1450 * here.
1451 */
1452 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1453 {
1454 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1455 up(&adapter->erp_ready_sem);
1456 zfcp_rec_dbf_event_thread_lock(3, adapter);
1457
1458 wait_event(adapter->erp_thread_wqh,
1459 !(atomic_read(&adapter->status) &
1460 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1461
1462 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1463 &adapter->status);
1464 }
1465
1466 /**
1467 * zfcp_erp_adapter_failed - Set adapter status to failed.
1468 * @adapter: Failed adapter.
1469 * @id: Event id for debug trace.
1470 * @ref: Reference for debug trace.
1471 */
1472 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, u8 id, void *ref)
1473 {
1474 zfcp_erp_modify_adapter_status(adapter, id, ref,
1475 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1476 }
1477
1478 /**
1479 * zfcp_erp_port_failed - Set port status to failed.
1480 * @port: Failed port.
1481 * @id: Event id for debug trace.
1482 * @ref: Reference for debug trace.
1483 */
1484 void zfcp_erp_port_failed(struct zfcp_port *port, u8 id, void *ref)
1485 {
1486 zfcp_erp_modify_port_status(port, id, ref,
1487 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1488 }
1489
1490 /**
1491 * zfcp_erp_unit_failed - Set unit status to failed.
1492 * @unit: Failed unit.
1493 * @id: Event id for debug trace.
1494 * @ref: Reference for debug trace.
1495 */
1496 void zfcp_erp_unit_failed(struct zfcp_unit *unit, u8 id, void *ref)
1497 {
1498 zfcp_erp_modify_unit_status(unit, id, ref,
1499 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1500 }
1501
1502 /**
1503 * zfcp_erp_wait - wait for completion of error recovery on an adapter
1504 * @adapter: adapter for which to wait for completion of its error recovery
1505 */
1506 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1507 {
1508 wait_event(adapter->erp_done_wqh,
1509 !(atomic_read(&adapter->status) &
1510 ZFCP_STATUS_ADAPTER_ERP_PENDING));
1511 }
1512
1513 /**
1514 * zfcp_erp_modify_adapter_status - change adapter status bits
1515 * @adapter: adapter to change the status
1516 * @id: id for the debug trace
1517 * @ref: reference for the debug trace
1518 * @mask: status bits to change
1519 * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1520 *
1521 * Changes in common status bits are propagated to attached ports and units.
1522 */
1523 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, u8 id,
1524 void *ref, u32 mask, int set_or_clear)
1525 {
1526 struct zfcp_port *port;
1527 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1528
1529 if (set_or_clear == ZFCP_SET) {
1530 if (status_change_set(mask, &adapter->status))
1531 zfcp_rec_dbf_event_adapter(id, ref, adapter);
1532 atomic_set_mask(mask, &adapter->status);
1533 } else {
1534 if (status_change_clear(mask, &adapter->status))
1535 zfcp_rec_dbf_event_adapter(id, ref, adapter);
1536 atomic_clear_mask(mask, &adapter->status);
1537 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1538 atomic_set(&adapter->erp_counter, 0);
1539 }
1540
1541 if (common_mask)
1542 list_for_each_entry(port, &adapter->port_list_head, list)
1543 zfcp_erp_modify_port_status(port, id, ref, common_mask,
1544 set_or_clear);
1545 }
1546
1547 /**
1548 * zfcp_erp_modify_port_status - change port status bits
1549 * @port: port to change the status bits
1550 * @id: id for the debug trace
1551 * @ref: reference for the debug trace
1552 * @mask: status bits to change
1553 * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1554 *
1555 * Changes in common status bits are propagated to attached units.
1556 */
1557 void zfcp_erp_modify_port_status(struct zfcp_port *port, u8 id, void *ref,
1558 u32 mask, int set_or_clear)
1559 {
1560 struct zfcp_unit *unit;
1561 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1562
1563 if (set_or_clear == ZFCP_SET) {
1564 if (status_change_set(mask, &port->status))
1565 zfcp_rec_dbf_event_port(id, ref, port);
1566 atomic_set_mask(mask, &port->status);
1567 } else {
1568 if (status_change_clear(mask, &port->status))
1569 zfcp_rec_dbf_event_port(id, ref, port);
1570 atomic_clear_mask(mask, &port->status);
1571 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1572 atomic_set(&port->erp_counter, 0);
1573 }
1574
1575 if (common_mask)
1576 list_for_each_entry(unit, &port->unit_list_head, list)
1577 zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1578 set_or_clear);
1579 }
1580
1581 /**
1582 * zfcp_erp_modify_unit_status - change unit status bits
1583 * @unit: unit to change the status bits
1584 * @id: id for the debug trace
1585 * @ref: reference for the debug trace
1586 * @mask: status bits to change
1587 * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1588 */
1589 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, u8 id, void *ref,
1590 u32 mask, int set_or_clear)
1591 {
1592 if (set_or_clear == ZFCP_SET) {
1593 if (status_change_set(mask, &unit->status))
1594 zfcp_rec_dbf_event_unit(id, ref, unit);
1595 atomic_set_mask(mask, &unit->status);
1596 } else {
1597 if (status_change_clear(mask, &unit->status))
1598 zfcp_rec_dbf_event_unit(id, ref, unit);
1599 atomic_clear_mask(mask, &unit->status);
1600 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1601 atomic_set(&unit->erp_counter, 0);
1602 }
1603 }
1604 }
1605
1606 /**
1607 * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1608 * @port: The "boxed" port.
1609 * @id: The debug trace id.
1610 * @id: Reference for the debug trace.
1611 */
1612 void zfcp_erp_port_boxed(struct zfcp_port *port, u8 id, void *ref)
1613 {
1614 unsigned long flags;
1615
1616 read_lock_irqsave(&zfcp_data.config_lock, flags);
1617 zfcp_erp_modify_port_status(port, id, ref,
1618 ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1619 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1620 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1621 }
1622
1623 /**
1624 * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1625 * @port: The "boxed" unit.
1626 * @id: The debug trace id.
1627 * @id: Reference for the debug trace.
1628 */
1629 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, u8 id, void *ref)
1630 {
1631 zfcp_erp_modify_unit_status(unit, id, ref,
1632 ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1633 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1634 }
1635
1636 /**
1637 * zfcp_erp_port_access_denied - Adapter denied access to port.
1638 * @port: port where access has been denied
1639 * @id: id for debug trace
1640 * @ref: reference for debug trace
1641 *
1642 * Since the adapter has denied access, stop using the port and the
1643 * attached units.
1644 */
1645 void zfcp_erp_port_access_denied(struct zfcp_port *port, u8 id, void *ref)
1646 {
1647 unsigned long flags;
1648
1649 read_lock_irqsave(&zfcp_data.config_lock, flags);
1650 zfcp_erp_modify_port_status(port, id, ref,
1651 ZFCP_STATUS_COMMON_ERP_FAILED |
1652 ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1653 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1654 }
1655
1656 /**
1657 * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1658 * @unit: unit where access has been denied
1659 * @id: id for debug trace
1660 * @ref: reference for debug trace
1661 *
1662 * Since the adapter has denied access, stop using the unit.
1663 */
1664 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, u8 id, void *ref)
1665 {
1666 zfcp_erp_modify_unit_status(unit, id, ref,
1667 ZFCP_STATUS_COMMON_ERP_FAILED |
1668 ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1669 }
1670
1671 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, u8 id,
1672 void *ref)
1673 {
1674 int status = atomic_read(&unit->status);
1675 if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1676 ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1677 return;
1678
1679 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1680 }
1681
1682 static void zfcp_erp_port_access_changed(struct zfcp_port *port, u8 id,
1683 void *ref)
1684 {
1685 struct zfcp_unit *unit;
1686 int status = atomic_read(&port->status);
1687
1688 if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1689 ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1690 list_for_each_entry(unit, &port->unit_list_head, list)
1691 zfcp_erp_unit_access_changed(unit, id, ref);
1692 return;
1693 }
1694
1695 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1696 }
1697
1698 /**
1699 * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1700 * @adapter: Adapter where the Access Control Table (ACT) changed
1701 * @id: Id for debug trace
1702 * @ref: Reference for debug trace
1703 */
1704 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, u8 id,
1705 void *ref)
1706 {
1707 struct zfcp_port *port;
1708 unsigned long flags;
1709
1710 if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1711 return;
1712
1713 read_lock_irqsave(&zfcp_data.config_lock, flags);
1714 list_for_each_entry(port, &adapter->port_list_head, list)
1715 zfcp_erp_port_access_changed(port, id, ref);
1716 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1717 }
Linux kernel - Deliverables
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