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Make sure omap cpufreq driver initializes after cpufreq framework and governors
[linux-ginger.git] / drivers / s390 / scsi / zfcp_erp.c
blob73d366ba31e593755d2854d4591888b9e949bba9
1 /*
2 * zfcp device driver
3 *
4 * Error Recovery Procedures (ERP).
5 *
6 * Copyright IBM Corporation 2002, 2009
7 */
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
17 enum 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
25 enum 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
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, "erablk1", 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_dbf_rec_action("erardy1", act);
79 wake_up(&adapter->erp_ready_wq);
80 zfcp_dbf_rec_thread("erardy2", adapter->dbf);
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 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
154 !(a_status & ZFCP_STATUS_COMMON_OPEN))
155 return 0; /* shutdown requested for closed adapter */
156 }
157
158 return need;
159 }
160
161 static 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
212 static 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
240 static 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 /* ensure propagation of failed status to new devices */
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
255 /**
256 * zfcp_erp_adapter_reopen - Reopen adapter.
257 * @adapter: Adapter to reopen.
258 * @clear: Status flags to clear.
259 * @id: Id for debug trace event.
260 * @ref: Reference for debug trace event.
261 */
262 void 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
274 /**
275 * zfcp_erp_adapter_shutdown - Shutdown adapter.
276 * @adapter: Adapter to shut down.
277 * @clear: Status flags to clear.
278 * @id: Id for debug trace event.
279 * @ref: Reference for debug trace event.
280 */
281 void 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
288 /**
289 * zfcp_erp_port_shutdown - Shutdown port
290 * @port: Port to shut down.
291 * @clear: Status flags to clear.
292 * @id: Id for debug trace event.
293 * @ref: Reference for debug trace event.
294 */
295 void 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
302 /**
303 * zfcp_erp_unit_shutdown - Shutdown unit
304 * @unit: Unit to shut down.
305 * @clear: Status flags to clear.
306 * @id: Id for debug trace event.
307 * @ref: Reference for debug trace event.
308 */
309 void 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
316 static 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
323 static 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 * zfcp_erp_port_forced_reopen - Forced close of port and open again
338 * @port: Port to force close and to reopen.
339 * @id: Id for debug trace event.
340 * @ref: Reference for debug trace event.
341 */
342 void 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
355 static 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 /* ensure propagation of failed status to new devices */
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 * zfcp_erp_port_reopen - trigger remote port recovery
373 * @port: port to recover
374 * @clear_mask: flags in port status to be cleared
375 *
376 * Returns 0 if recovery has been triggered, < 0 if not.
377 */
378 int 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
393 static 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
400 static 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 * zfcp_erp_unit_reopen - initiate reopen of a unit
416 * @unit: unit to be reopened
417 * @clear_mask: specifies flags in unit status to be cleared
418 * Return: 0 on success, < 0 on error
419 */
420 void 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
434 static int status_change_set(unsigned long mask, atomic_t *status)
435 {
436 return (atomic_read(status) ^ mask) & mask;
437 }
438
439 static int status_change_clear(unsigned long mask, atomic_t *status)
440 {
441 return atomic_read(status) & mask;
442 }
443
444 static 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
451 static 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
458 static 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
465 static 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
471 static 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 * zfcp_erp_notify - Trigger ERP action.
498 * @erp_action: ERP action to continue.
499 * @set_mask: ERP action status flags to set.
500 */
501 void 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 * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
516 * @data: ERP action (from timer data)
517 */
518 void 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
524 static void zfcp_erp_memwait_handler(unsigned long data)
525 {
526 zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
527 }
528
529 static 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
538 static 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
547 static 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
556 static 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
574 static 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
589 static 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
605 static 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
616 static 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)) /* error or port already attached */
622 return;
623 _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
624 }
625
626 static 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
673 static 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
698 static 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
713 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
714 {
715 struct zfcp_adapter *adapter = act->adapter;
716
717 /* close queues to ensure that buffers are not accessed by adapter */
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 /* all ports and units are closed */
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
730 static 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
751 static 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
769 static 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
783 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
784 {
785 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
786 }
787
788 static 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
809 static 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
822 static 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
835 static 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
848 static 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_port_get(port);
862 if (!queue_work(adapter->work_queue,
863 &port->gid_pn_work))
864 zfcp_port_put(port);
865 return ZFCP_ERP_EXIT;
866 }
867 return zfcp_erp_port_strategy_open_port(act);
868
869 case ZFCP_ERP_STEP_PORT_OPENING:
870 /* D_ID might have changed during open */
871 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
872 if (port->d_id)
873 return ZFCP_ERP_SUCCEEDED;
874 else {
875 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
876 return ZFCP_ERP_CONTINUES;
877 }
878 }
879 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
880 port->d_id = 0;
881 _zfcp_erp_port_reopen(port, 0, "erpsoc1", NULL);
882 return ZFCP_ERP_EXIT;
883 }
884 /* fall through otherwise */
885 }
886 return ZFCP_ERP_FAILED;
887 }
888
889 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
890 {
891 struct zfcp_port *port = erp_action->port;
892
893 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
894 goto close_init_done;
895
896 switch (erp_action->step) {
897 case ZFCP_ERP_STEP_UNINITIALIZED:
898 zfcp_erp_port_strategy_clearstati(port);
899 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
900 return zfcp_erp_port_strategy_close(erp_action);
901 break;
902
903 case ZFCP_ERP_STEP_PORT_CLOSING:
904 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
905 return ZFCP_ERP_FAILED;
906 break;
907 }
908
909 close_init_done:
910 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
911 return ZFCP_ERP_EXIT;
912
913 return zfcp_erp_port_strategy_open_common(erp_action);
914 }
915
916 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
917 {
918 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
919 ZFCP_STATUS_UNIT_SHARED |
920 ZFCP_STATUS_UNIT_READONLY,
921 &unit->status);
922 }
923
924 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
925 {
926 int retval = zfcp_fsf_close_unit(erp_action);
927 if (retval == -ENOMEM)
928 return ZFCP_ERP_NOMEM;
929 erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
930 if (retval)
931 return ZFCP_ERP_FAILED;
932 return ZFCP_ERP_CONTINUES;
933 }
934
935 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
936 {
937 int retval = zfcp_fsf_open_unit(erp_action);
938 if (retval == -ENOMEM)
939 return ZFCP_ERP_NOMEM;
940 erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
941 if (retval)
942 return ZFCP_ERP_FAILED;
943 return ZFCP_ERP_CONTINUES;
944 }
945
946 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
947 {
948 struct zfcp_unit *unit = erp_action->unit;
949
950 switch (erp_action->step) {
951 case ZFCP_ERP_STEP_UNINITIALIZED:
952 zfcp_erp_unit_strategy_clearstati(unit);
953 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
954 return zfcp_erp_unit_strategy_close(erp_action);
955 /* already closed, fall through */
956 case ZFCP_ERP_STEP_UNIT_CLOSING:
957 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
958 return ZFCP_ERP_FAILED;
959 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
960 return ZFCP_ERP_EXIT;
961 return zfcp_erp_unit_strategy_open(erp_action);
962
963 case ZFCP_ERP_STEP_UNIT_OPENING:
964 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
965 return ZFCP_ERP_SUCCEEDED;
966 }
967 return ZFCP_ERP_FAILED;
968 }
969
970 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
971 {
972 switch (result) {
973 case ZFCP_ERP_SUCCEEDED :
974 atomic_set(&unit->erp_counter, 0);
975 zfcp_erp_unit_unblock(unit);
976 break;
977 case ZFCP_ERP_FAILED :
978 atomic_inc(&unit->erp_counter);
979 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
980 dev_err(&unit->port->adapter->ccw_device->dev,
981 "ERP failed for unit 0x%016Lx on "
982 "port 0x%016Lx\n",
983 (unsigned long long)unit->fcp_lun,
984 (unsigned long long)unit->port->wwpn);
985 zfcp_erp_unit_failed(unit, "erusck1", NULL);
986 }
987 break;
988 }
989
990 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
991 zfcp_erp_unit_block(unit, 0);
992 result = ZFCP_ERP_EXIT;
993 }
994 return result;
995 }
996
997 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
998 {
999 switch (result) {
1000 case ZFCP_ERP_SUCCEEDED :
1001 atomic_set(&port->erp_counter, 0);
1002 zfcp_erp_port_unblock(port);
1003 break;
1004
1005 case ZFCP_ERP_FAILED :
1006 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1007 zfcp_erp_port_block(port, 0);
1008 result = ZFCP_ERP_EXIT;
1009 }
1010 atomic_inc(&port->erp_counter);
1011 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1012 dev_err(&port->adapter->ccw_device->dev,
1013 "ERP failed for remote port 0x%016Lx\n",
1014 (unsigned long long)port->wwpn);
1015 zfcp_erp_port_failed(port, "erpsck1", NULL);
1016 }
1017 break;
1018 }
1019
1020 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1021 zfcp_erp_port_block(port, 0);
1022 result = ZFCP_ERP_EXIT;
1023 }
1024 return result;
1025 }
1026
1027 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1028 int result)
1029 {
1030 switch (result) {
1031 case ZFCP_ERP_SUCCEEDED :
1032 atomic_set(&adapter->erp_counter, 0);
1033 zfcp_erp_adapter_unblock(adapter);
1034 break;
1035
1036 case ZFCP_ERP_FAILED :
1037 atomic_inc(&adapter->erp_counter);
1038 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1039 dev_err(&adapter->ccw_device->dev,
1040 "ERP cannot recover an error "
1041 "on the FCP device\n");
1042 zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1043 }
1044 break;
1045 }
1046
1047 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1048 zfcp_erp_adapter_block(adapter, 0);
1049 result = ZFCP_ERP_EXIT;
1050 }
1051 return result;
1052 }
1053
1054 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1055 int result)
1056 {
1057 struct zfcp_adapter *adapter = erp_action->adapter;
1058 struct zfcp_port *port = erp_action->port;
1059 struct zfcp_unit *unit = erp_action->unit;
1060
1061 switch (erp_action->action) {
1062
1063 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1064 result = zfcp_erp_strategy_check_unit(unit, result);
1065 break;
1066
1067 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1068 case ZFCP_ERP_ACTION_REOPEN_PORT:
1069 result = zfcp_erp_strategy_check_port(port, result);
1070 break;
1071
1072 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1073 result = zfcp_erp_strategy_check_adapter(adapter, result);
1074 break;
1075 }
1076 return result;
1077 }
1078
1079 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1080 {
1081 int status = atomic_read(target_status);
1082
1083 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1084 (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1085 return 1; /* take it online */
1086
1087 if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1088 !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1089 return 1; /* take it offline */
1090
1091 return 0;
1092 }
1093
1094 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1095 {
1096 int action = act->action;
1097 struct zfcp_adapter *adapter = act->adapter;
1098 struct zfcp_port *port = act->port;
1099 struct zfcp_unit *unit = act->unit;
1100 u32 erp_status = act->status;
1101
1102 switch (action) {
1103 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1104 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1105 _zfcp_erp_adapter_reopen(adapter,
1106 ZFCP_STATUS_COMMON_ERP_FAILED,
1107 "ersscg1", NULL);
1108 return ZFCP_ERP_EXIT;
1109 }
1110 break;
1111
1112 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1113 case ZFCP_ERP_ACTION_REOPEN_PORT:
1114 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1115 _zfcp_erp_port_reopen(port,
1116 ZFCP_STATUS_COMMON_ERP_FAILED,
1117 "ersscg2", NULL);
1118 return ZFCP_ERP_EXIT;
1119 }
1120 break;
1121
1122 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1123 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1124 _zfcp_erp_unit_reopen(unit,
1125 ZFCP_STATUS_COMMON_ERP_FAILED,
1126 "ersscg3", NULL);
1127 return ZFCP_ERP_EXIT;
1128 }
1129 break;
1130 }
1131 return ret;
1132 }
1133
1134 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1135 {
1136 struct zfcp_adapter *adapter = erp_action->adapter;
1137
1138 adapter->erp_total_count--;
1139 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1140 adapter->erp_low_mem_count--;
1141 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1142 }
1143
1144 list_del(&erp_action->list);
1145 zfcp_dbf_rec_action("eractd1", erp_action);
1146
1147 switch (erp_action->action) {
1148 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1149 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1150 &erp_action->unit->status);
1151 break;
1152
1153 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1154 case ZFCP_ERP_ACTION_REOPEN_PORT:
1155 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1156 &erp_action->port->status);
1157 break;
1158
1159 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1160 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1161 &erp_action->adapter->status);
1162 break;
1163 }
1164 }
1165
1166 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1167 {
1168 struct zfcp_adapter *adapter = act->adapter;
1169 struct zfcp_port *port = act->port;
1170 struct zfcp_unit *unit = act->unit;
1171
1172 switch (act->action) {
1173 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1174 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1175 zfcp_unit_get(unit);
1176 if (scsi_queue_work(unit->port->adapter->scsi_host,
1177 &unit->scsi_work) <= 0)
1178 zfcp_unit_put(unit);
1179 }
1180 zfcp_unit_put(unit);
1181 break;
1182
1183 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1184 case ZFCP_ERP_ACTION_REOPEN_PORT:
1185 if (result == ZFCP_ERP_SUCCEEDED)
1186 zfcp_scsi_schedule_rport_register(port);
1187 zfcp_port_put(port);
1188 break;
1189
1190 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1191 if (result == ZFCP_ERP_SUCCEEDED) {
1192 register_service_level(&adapter->service_level);
1193 schedule_work(&adapter->scan_work);
1194 } else
1195 unregister_service_level(&adapter->service_level);
1196 zfcp_adapter_put(adapter);
1197 break;
1198 }
1199 }
1200
1201 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1202 {
1203 switch (erp_action->action) {
1204 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1205 return zfcp_erp_adapter_strategy(erp_action);
1206 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1207 return zfcp_erp_port_forced_strategy(erp_action);
1208 case ZFCP_ERP_ACTION_REOPEN_PORT:
1209 return zfcp_erp_port_strategy(erp_action);
1210 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1211 return zfcp_erp_unit_strategy(erp_action);
1212 }
1213 return ZFCP_ERP_FAILED;
1214 }
1215
1216 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1217 {
1218 int retval;
1219 struct zfcp_adapter *adapter = erp_action->adapter;
1220 unsigned long flags;
1221
1222 read_lock_irqsave(&zfcp_data.config_lock, flags);
1223 write_lock(&adapter->erp_lock);
1224
1225 zfcp_erp_strategy_check_fsfreq(erp_action);
1226
1227 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1228 zfcp_erp_action_dequeue(erp_action);
1229 retval = ZFCP_ERP_DISMISSED;
1230 goto unlock;
1231 }
1232
1233 zfcp_erp_action_to_running(erp_action);
1234
1235 /* no lock to allow for blocking operations */
1236 write_unlock(&adapter->erp_lock);
1237 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1238 retval = zfcp_erp_strategy_do_action(erp_action);
1239 read_lock_irqsave(&zfcp_data.config_lock, flags);
1240 write_lock(&adapter->erp_lock);
1241
1242 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1243 retval = ZFCP_ERP_CONTINUES;
1244
1245 switch (retval) {
1246 case ZFCP_ERP_NOMEM:
1247 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1248 ++adapter->erp_low_mem_count;
1249 erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1250 }
1251 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1252 _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1253 else {
1254 zfcp_erp_strategy_memwait(erp_action);
1255 retval = ZFCP_ERP_CONTINUES;
1256 }
1257 goto unlock;
1258
1259 case ZFCP_ERP_CONTINUES:
1260 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1261 --adapter->erp_low_mem_count;
1262 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1263 }
1264 goto unlock;
1265 }
1266
1267 retval = zfcp_erp_strategy_check_target(erp_action, retval);
1268 zfcp_erp_action_dequeue(erp_action);
1269 retval = zfcp_erp_strategy_statechange(erp_action, retval);
1270 if (retval == ZFCP_ERP_EXIT)
1271 goto unlock;
1272 if (retval == ZFCP_ERP_SUCCEEDED)
1273 zfcp_erp_strategy_followup_success(erp_action);
1274 if (retval == ZFCP_ERP_FAILED)
1275 zfcp_erp_strategy_followup_failed(erp_action);
1276
1277 unlock:
1278 write_unlock(&adapter->erp_lock);
1279 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1280
1281 if (retval != ZFCP_ERP_CONTINUES)
1282 zfcp_erp_action_cleanup(erp_action, retval);
1283
1284 return retval;
1285 }
1286
1287 static int zfcp_erp_thread(void *data)
1288 {
1289 struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1290 struct list_head *next;
1291 struct zfcp_erp_action *act;
1292 unsigned long flags;
1293
1294 for (;;) {
1295 zfcp_dbf_rec_thread_lock("erthrd1", adapter->dbf);
1296 wait_event_interruptible(adapter->erp_ready_wq,
1297 !list_empty(&adapter->erp_ready_head) ||
1298 kthread_should_stop());
1299 zfcp_dbf_rec_thread_lock("erthrd2", adapter->dbf);
1300
1301 if (kthread_should_stop())
1302 break;
1303
1304 write_lock_irqsave(&adapter->erp_lock, flags);
1305 next = adapter->erp_ready_head.next;
1306 write_unlock_irqrestore(&adapter->erp_lock, flags);
1307
1308 if (next != &adapter->erp_ready_head) {
1309 act = list_entry(next, struct zfcp_erp_action, list);
1310
1311 /* there is more to come after dismission, no notify */
1312 if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1313 zfcp_erp_wakeup(adapter);
1314 }
1315 }
1316
1317 return 0;
1318 }
1319
1320 /**
1321 * zfcp_erp_thread_setup - Start ERP thread for adapter
1322 * @adapter: Adapter to start the ERP thread for
1323 *
1324 * Returns 0 on success or error code from kernel_thread()
1325 */
1326 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1327 {
1328 struct task_struct *thread;
1329
1330 thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
1331 dev_name(&adapter->ccw_device->dev));
1332 if (IS_ERR(thread)) {
1333 dev_err(&adapter->ccw_device->dev,
1334 "Creating an ERP thread for the FCP device failed.\n");
1335 return PTR_ERR(thread);
1336 }
1337
1338 adapter->erp_thread = thread;
1339 return 0;
1340 }
1341
1342 /**
1343 * zfcp_erp_thread_kill - Stop ERP thread.
1344 * @adapter: Adapter where the ERP thread should be stopped.
1345 *
1346 * The caller of this routine ensures that the specified adapter has
1347 * been shut down and that this operation has been completed. Thus,
1348 * there are no pending erp_actions which would need to be handled
1349 * here.
1350 */
1351 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1352 {
1353 kthread_stop(adapter->erp_thread);
1354 adapter->erp_thread = NULL;
1355 WARN_ON(!list_empty(&adapter->erp_ready_head));
1356 WARN_ON(!list_empty(&adapter->erp_running_head));
1357 }
1358
1359 /**
1360 * zfcp_erp_adapter_failed - Set adapter status to failed.
1361 * @adapter: Failed adapter.
1362 * @id: Event id for debug trace.
1363 * @ref: Reference for debug trace.
1364 */
1365 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1366 {
1367 zfcp_erp_modify_adapter_status(adapter, id, ref,
1368 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1369 }
1370
1371 /**
1372 * zfcp_erp_port_failed - Set port status to failed.
1373 * @port: Failed port.
1374 * @id: Event id for debug trace.
1375 * @ref: Reference for debug trace.
1376 */
1377 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1378 {
1379 zfcp_erp_modify_port_status(port, id, ref,
1380 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1381 }
1382
1383 /**
1384 * zfcp_erp_unit_failed - Set unit status to failed.
1385 * @unit: Failed unit.
1386 * @id: Event id for debug trace.
1387 * @ref: Reference for debug trace.
1388 */
1389 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1390 {
1391 zfcp_erp_modify_unit_status(unit, id, ref,
1392 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1393 }
1394
1395 /**
1396 * zfcp_erp_wait - wait for completion of error recovery on an adapter
1397 * @adapter: adapter for which to wait for completion of its error recovery
1398 */
1399 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1400 {
1401 wait_event(adapter->erp_done_wqh,
1402 !(atomic_read(&adapter->status) &
1403 ZFCP_STATUS_ADAPTER_ERP_PENDING));
1404 }
1405
1406 /**
1407 * zfcp_erp_modify_adapter_status - change adapter status bits
1408 * @adapter: adapter to change the status
1409 * @id: id for the debug trace
1410 * @ref: reference for the debug trace
1411 * @mask: status bits to change
1412 * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1413 *
1414 * Changes in common status bits are propagated to attached ports and units.
1415 */
1416 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1417 void *ref, u32 mask, int set_or_clear)
1418 {
1419 struct zfcp_port *port;
1420 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1421
1422 if (set_or_clear == ZFCP_SET) {
1423 if (status_change_set(mask, &adapter->status))
1424 zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1425 atomic_set_mask(mask, &adapter->status);
1426 } else {
1427 if (status_change_clear(mask, &adapter->status))
1428 zfcp_dbf_rec_adapter(id, ref, adapter->dbf);
1429 atomic_clear_mask(mask, &adapter->status);
1430 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1431 atomic_set(&adapter->erp_counter, 0);
1432 }
1433
1434 if (common_mask)
1435 list_for_each_entry(port, &adapter->port_list_head, list)
1436 zfcp_erp_modify_port_status(port, id, ref, common_mask,
1437 set_or_clear);
1438 }
1439
1440 /**
1441 * zfcp_erp_modify_port_status - change port status bits
1442 * @port: port to change the status bits
1443 * @id: id for the debug trace
1444 * @ref: reference for the debug trace
1445 * @mask: status bits to change
1446 * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1447 *
1448 * Changes in common status bits are propagated to attached units.
1449 */
1450 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1451 u32 mask, int set_or_clear)
1452 {
1453 struct zfcp_unit *unit;
1454 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1455
1456 if (set_or_clear == ZFCP_SET) {
1457 if (status_change_set(mask, &port->status))
1458 zfcp_dbf_rec_port(id, ref, port);
1459 atomic_set_mask(mask, &port->status);
1460 } else {
1461 if (status_change_clear(mask, &port->status))
1462 zfcp_dbf_rec_port(id, ref, port);
1463 atomic_clear_mask(mask, &port->status);
1464 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1465 atomic_set(&port->erp_counter, 0);
1466 }
1467
1468 if (common_mask)
1469 list_for_each_entry(unit, &port->unit_list_head, list)
1470 zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1471 set_or_clear);
1472 }
1473
1474 /**
1475 * zfcp_erp_modify_unit_status - change unit status bits
1476 * @unit: unit to change the status bits
1477 * @id: id for the debug trace
1478 * @ref: reference for the debug trace
1479 * @mask: status bits to change
1480 * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1481 */
1482 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1483 u32 mask, int set_or_clear)
1484 {
1485 if (set_or_clear == ZFCP_SET) {
1486 if (status_change_set(mask, &unit->status))
1487 zfcp_dbf_rec_unit(id, ref, unit);
1488 atomic_set_mask(mask, &unit->status);
1489 } else {
1490 if (status_change_clear(mask, &unit->status))
1491 zfcp_dbf_rec_unit(id, ref, unit);
1492 atomic_clear_mask(mask, &unit->status);
1493 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1494 atomic_set(&unit->erp_counter, 0);
1495 }
1496 }
1497 }
1498
1499 /**
1500 * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1501 * @port: The "boxed" port.
1502 * @id: The debug trace id.
1503 * @id: Reference for the debug trace.
1504 */
1505 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1506 {
1507 unsigned long flags;
1508
1509 read_lock_irqsave(&zfcp_data.config_lock, flags);
1510 zfcp_erp_modify_port_status(port, id, ref,
1511 ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1512 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1513 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1514 }
1515
1516 /**
1517 * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1518 * @port: The "boxed" unit.
1519 * @id: The debug trace id.
1520 * @id: Reference for the debug trace.
1521 */
1522 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1523 {
1524 zfcp_erp_modify_unit_status(unit, id, ref,
1525 ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1526 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1527 }
1528
1529 /**
1530 * zfcp_erp_port_access_denied - Adapter denied access to port.
1531 * @port: port where access has been denied
1532 * @id: id for debug trace
1533 * @ref: reference for debug trace
1534 *
1535 * Since the adapter has denied access, stop using the port and the
1536 * attached units.
1537 */
1538 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1539 {
1540 unsigned long flags;
1541
1542 read_lock_irqsave(&zfcp_data.config_lock, flags);
1543 zfcp_erp_modify_port_status(port, id, ref,
1544 ZFCP_STATUS_COMMON_ERP_FAILED |
1545 ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1546 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1547 }
1548
1549 /**
1550 * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1551 * @unit: unit where access has been denied
1552 * @id: id for debug trace
1553 * @ref: reference for debug trace
1554 *
1555 * Since the adapter has denied access, stop using the unit.
1556 */
1557 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1558 {
1559 zfcp_erp_modify_unit_status(unit, id, ref,
1560 ZFCP_STATUS_COMMON_ERP_FAILED |
1561 ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1562 }
1563
1564 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1565 void *ref)
1566 {
1567 int status = atomic_read(&unit->status);
1568 if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1569 ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1570 return;
1571
1572 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1573 }
1574
1575 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1576 void *ref)
1577 {
1578 struct zfcp_unit *unit;
1579 int status = atomic_read(&port->status);
1580
1581 if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1582 ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1583 list_for_each_entry(unit, &port->unit_list_head, list)
1584 zfcp_erp_unit_access_changed(unit, id, ref);
1585 return;
1586 }
1587
1588 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1589 }
1590
1591 /**
1592 * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1593 * @adapter: Adapter where the Access Control Table (ACT) changed
1594 * @id: Id for debug trace
1595 * @ref: Reference for debug trace
1596 */
1597 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1598 void *ref)
1599 {
1600 struct zfcp_port *port;
1601 unsigned long flags;
1602
1603 if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1604 return;
1605
1606 read_lock_irqsave(&zfcp_data.config_lock, flags);
1607 list_for_each_entry(port, &adapter->port_list_head, list)
1608 zfcp_erp_port_access_changed(port, id, ref);
1609 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1610 }
Linux for Ginger Game Console