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8
9#define KMSG_COMPONENT "zfcp"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/kthread.h>
13#include "zfcp_ext.h"
14#include "zfcp_reqlist.h"
15
16#define ZFCP_MAX_ERPS 3
17
18enum zfcp_erp_act_flags {
19 ZFCP_STATUS_ERP_TIMEDOUT = 0x10000000,
20 ZFCP_STATUS_ERP_CLOSE_ONLY = 0x01000000,
21 ZFCP_STATUS_ERP_DISMISSING = 0x00100000,
22 ZFCP_STATUS_ERP_DISMISSED = 0x00200000,
23 ZFCP_STATUS_ERP_LOWMEM = 0x00400000,
24 ZFCP_STATUS_ERP_NO_REF = 0x00800000,
25};
26
27enum zfcp_erp_steps {
28 ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
29 ZFCP_ERP_STEP_FSF_XCONFIG = 0x0001,
30 ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
31 ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
32 ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
33 ZFCP_ERP_STEP_LUN_CLOSING = 0x1000,
34 ZFCP_ERP_STEP_LUN_OPENING = 0x2000,
35};
36
37enum zfcp_erp_act_type {
38 ZFCP_ERP_ACTION_REOPEN_LUN = 1,
39 ZFCP_ERP_ACTION_REOPEN_PORT = 2,
40 ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
41 ZFCP_ERP_ACTION_REOPEN_ADAPTER = 4,
42};
43
44enum zfcp_erp_act_state {
45 ZFCP_ERP_ACTION_RUNNING = 1,
46 ZFCP_ERP_ACTION_READY = 2,
47};
48
49enum zfcp_erp_act_result {
50 ZFCP_ERP_SUCCEEDED = 0,
51 ZFCP_ERP_FAILED = 1,
52 ZFCP_ERP_CONTINUES = 2,
53 ZFCP_ERP_EXIT = 3,
54 ZFCP_ERP_DISMISSED = 4,
55 ZFCP_ERP_NOMEM = 5,
56};
57
58static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
59{
60 zfcp_erp_clear_adapter_status(adapter,
61 ZFCP_STATUS_COMMON_UNBLOCKED | mask);
62}
63
64static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
65{
66 struct zfcp_erp_action *curr_act;
67
68 list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
69 if (act == curr_act)
70 return ZFCP_ERP_ACTION_RUNNING;
71 return 0;
72}
73
74static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
75{
76 struct zfcp_adapter *adapter = act->adapter;
77
78 list_move(&act->list, &act->adapter->erp_ready_head);
79 zfcp_dbf_rec_run("erardy1", act);
80 wake_up(&adapter->erp_ready_wq);
81 zfcp_dbf_rec_run("erardy2", act);
82}
83
84static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
85{
86 act->status |= ZFCP_STATUS_ERP_DISMISSED;
87 if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
88 zfcp_erp_action_ready(act);
89}
90
91static void zfcp_erp_action_dismiss_lun(struct scsi_device *sdev)
92{
93 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
94
95 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
96 zfcp_erp_action_dismiss(&zfcp_sdev->erp_action);
97}
98
99static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
100{
101 struct scsi_device *sdev;
102
103 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
104 zfcp_erp_action_dismiss(&port->erp_action);
105 else {
106 spin_lock(port->adapter->scsi_host->host_lock);
107 __shost_for_each_device(sdev, port->adapter->scsi_host)
108 if (sdev_to_zfcp(sdev)->port == port)
109 zfcp_erp_action_dismiss_lun(sdev);
110 spin_unlock(port->adapter->scsi_host->host_lock);
111 }
112}
113
114static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
115{
116 struct zfcp_port *port;
117
118 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
119 zfcp_erp_action_dismiss(&adapter->erp_action);
120 else {
121 read_lock(&adapter->port_list_lock);
122 list_for_each_entry(port, &adapter->port_list, list)
123 zfcp_erp_action_dismiss_port(port);
124 read_unlock(&adapter->port_list_lock);
125 }
126}
127
128static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
129 struct zfcp_port *port,
130 struct scsi_device *sdev)
131{
132 int need = want;
133 int l_status, p_status, a_status;
134 struct zfcp_scsi_dev *zfcp_sdev;
135
136 switch (want) {
137 case ZFCP_ERP_ACTION_REOPEN_LUN:
138 zfcp_sdev = sdev_to_zfcp(sdev);
139 l_status = atomic_read(&zfcp_sdev->status);
140 if (l_status & ZFCP_STATUS_COMMON_ERP_INUSE)
141 return 0;
142 p_status = atomic_read(&port->status);
143 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
144 p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
145 return 0;
146 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
147 need = ZFCP_ERP_ACTION_REOPEN_PORT;
148
149 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
150 p_status = atomic_read(&port->status);
151 if (!(p_status & ZFCP_STATUS_COMMON_OPEN))
152 need = ZFCP_ERP_ACTION_REOPEN_PORT;
153
154 case ZFCP_ERP_ACTION_REOPEN_PORT:
155 p_status = atomic_read(&port->status);
156 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
157 return 0;
158 a_status = atomic_read(&adapter->status);
159 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
160 a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
161 return 0;
162 if (p_status & ZFCP_STATUS_COMMON_NOESC)
163 return need;
164 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
165 need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
166
167 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
168 a_status = atomic_read(&adapter->status);
169 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
170 return 0;
171 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
172 !(a_status & ZFCP_STATUS_COMMON_OPEN))
173 return 0;
174 }
175
176 return need;
177}
178
179static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status,
180 struct zfcp_adapter *adapter,
181 struct zfcp_port *port,
182 struct scsi_device *sdev)
183{
184 struct zfcp_erp_action *erp_action;
185 struct zfcp_scsi_dev *zfcp_sdev;
186
187 switch (need) {
188 case ZFCP_ERP_ACTION_REOPEN_LUN:
189 zfcp_sdev = sdev_to_zfcp(sdev);
190 if (!(act_status & ZFCP_STATUS_ERP_NO_REF))
191 if (scsi_device_get(sdev))
192 return NULL;
193 atomic_or(ZFCP_STATUS_COMMON_ERP_INUSE,
194 &zfcp_sdev->status);
195 erp_action = &zfcp_sdev->erp_action;
196 memset(erp_action, 0, sizeof(struct zfcp_erp_action));
197 erp_action->port = port;
198 erp_action->sdev = sdev;
199 if (!(atomic_read(&zfcp_sdev->status) &
200 ZFCP_STATUS_COMMON_RUNNING))
201 act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
202 break;
203
204 case ZFCP_ERP_ACTION_REOPEN_PORT:
205 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
206 if (!get_device(&port->dev))
207 return NULL;
208 zfcp_erp_action_dismiss_port(port);
209 atomic_or(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
210 erp_action = &port->erp_action;
211 memset(erp_action, 0, sizeof(struct zfcp_erp_action));
212 erp_action->port = port;
213 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
214 act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
215 break;
216
217 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
218 kref_get(&adapter->ref);
219 zfcp_erp_action_dismiss_adapter(adapter);
220 atomic_or(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
221 erp_action = &adapter->erp_action;
222 memset(erp_action, 0, sizeof(struct zfcp_erp_action));
223 if (!(atomic_read(&adapter->status) &
224 ZFCP_STATUS_COMMON_RUNNING))
225 act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
226 break;
227
228 default:
229 return NULL;
230 }
231
232 erp_action->adapter = adapter;
233 erp_action->action = need;
234 erp_action->status = act_status;
235
236 return erp_action;
237}
238
239static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
240 struct zfcp_port *port,
241 struct scsi_device *sdev,
242 char *id, u32 act_status)
243{
244 int retval = 1, need;
245 struct zfcp_erp_action *act;
246
247 if (!adapter->erp_thread)
248 return -EIO;
249
250 need = zfcp_erp_required_act(want, adapter, port, sdev);
251 if (!need)
252 goto out;
253
254 act = zfcp_erp_setup_act(need, act_status, adapter, port, sdev);
255 if (!act)
256 goto out;
257 atomic_or(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
258 ++adapter->erp_total_count;
259 list_add_tail(&act->list, &adapter->erp_ready_head);
260 wake_up(&adapter->erp_ready_wq);
261 retval = 0;
262 out:
263 zfcp_dbf_rec_trig(id, adapter, port, sdev, want, need);
264 return retval;
265}
266
267static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
268 int clear_mask, char *id)
269{
270 zfcp_erp_adapter_block(adapter, clear_mask);
271 zfcp_scsi_schedule_rports_block(adapter);
272
273
274 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
275 zfcp_erp_set_adapter_status(adapter,
276 ZFCP_STATUS_COMMON_ERP_FAILED);
277 return -EIO;
278 }
279 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
280 adapter, NULL, NULL, id, 0);
281}
282
283
284
285
286
287
288
289void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear, char *id)
290{
291 unsigned long flags;
292
293 zfcp_erp_adapter_block(adapter, clear);
294 zfcp_scsi_schedule_rports_block(adapter);
295
296 write_lock_irqsave(&adapter->erp_lock, flags);
297 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
298 zfcp_erp_set_adapter_status(adapter,
299 ZFCP_STATUS_COMMON_ERP_FAILED);
300 else
301 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter,
302 NULL, NULL, id, 0);
303 write_unlock_irqrestore(&adapter->erp_lock, flags);
304}
305
306
307
308
309
310
311
312void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
313 char *id)
314{
315 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
316 zfcp_erp_adapter_reopen(adapter, clear | flags, id);
317}
318
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320
321
322
323
324
325void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id)
326{
327 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
328 zfcp_erp_port_reopen(port, clear | flags, id);
329}
330
331static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
332{
333 zfcp_erp_clear_port_status(port,
334 ZFCP_STATUS_COMMON_UNBLOCKED | clear);
335}
336
337static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear,
338 char *id)
339{
340 zfcp_erp_port_block(port, clear);
341 zfcp_scsi_schedule_rport_block(port);
342
343 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
344 return;
345
346 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
347 port->adapter, port, NULL, id, 0);
348}
349
350
351
352
353
354
355
356void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id)
357{
358 unsigned long flags;
359 struct zfcp_adapter *adapter = port->adapter;
360
361 write_lock_irqsave(&adapter->erp_lock, flags);
362 _zfcp_erp_port_forced_reopen(port, clear, id);
363 write_unlock_irqrestore(&adapter->erp_lock, flags);
364}
365
366static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
367{
368 zfcp_erp_port_block(port, clear);
369 zfcp_scsi_schedule_rport_block(port);
370
371 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
372
373 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
374 return -EIO;
375 }
376
377 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
378 port->adapter, port, NULL, id, 0);
379}
380
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387
388
389int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
390{
391 int retval;
392 unsigned long flags;
393 struct zfcp_adapter *adapter = port->adapter;
394
395 write_lock_irqsave(&adapter->erp_lock, flags);
396 retval = _zfcp_erp_port_reopen(port, clear, id);
397 write_unlock_irqrestore(&adapter->erp_lock, flags);
398
399 return retval;
400}
401
402static void zfcp_erp_lun_block(struct scsi_device *sdev, int clear_mask)
403{
404 zfcp_erp_clear_lun_status(sdev,
405 ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask);
406}
407
408static void _zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id,
409 u32 act_status)
410{
411 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
412 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
413
414 zfcp_erp_lun_block(sdev, clear);
415
416 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
417 return;
418
419 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter,
420 zfcp_sdev->port, sdev, id, act_status);
421}
422
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425
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427
428
429
430
431void zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id)
432{
433 unsigned long flags;
434 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
435 struct zfcp_port *port = zfcp_sdev->port;
436 struct zfcp_adapter *adapter = port->adapter;
437
438 write_lock_irqsave(&adapter->erp_lock, flags);
439 _zfcp_erp_lun_reopen(sdev, clear, id, 0);
440 write_unlock_irqrestore(&adapter->erp_lock, flags);
441}
442
443
444
445
446
447
448
449void zfcp_erp_lun_shutdown(struct scsi_device *sdev, int clear, char *id)
450{
451 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
452 zfcp_erp_lun_reopen(sdev, clear | flags, id);
453}
454
455
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458
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460
461
462
463
464
465void zfcp_erp_lun_shutdown_wait(struct scsi_device *sdev, char *id)
466{
467 unsigned long flags;
468 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
469 struct zfcp_port *port = zfcp_sdev->port;
470 struct zfcp_adapter *adapter = port->adapter;
471 int clear = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
472
473 write_lock_irqsave(&adapter->erp_lock, flags);
474 _zfcp_erp_lun_reopen(sdev, clear, id, ZFCP_STATUS_ERP_NO_REF);
475 write_unlock_irqrestore(&adapter->erp_lock, flags);
476
477 zfcp_erp_wait(adapter);
478}
479
480static int status_change_set(unsigned long mask, atomic_t *status)
481{
482 return (atomic_read(status) ^ mask) & mask;
483}
484
485static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
486{
487 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
488 zfcp_dbf_rec_run("eraubl1", &adapter->erp_action);
489 atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
490}
491
492static void zfcp_erp_port_unblock(struct zfcp_port *port)
493{
494 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
495 zfcp_dbf_rec_run("erpubl1", &port->erp_action);
496 atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
497}
498
499static void zfcp_erp_lun_unblock(struct scsi_device *sdev)
500{
501 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
502
503 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status))
504 zfcp_dbf_rec_run("erlubl1", &sdev_to_zfcp(sdev)->erp_action);
505 atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status);
506}
507
508static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
509{
510 list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
511 zfcp_dbf_rec_run("erator1", erp_action);
512}
513
514static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
515{
516 struct zfcp_adapter *adapter = act->adapter;
517 struct zfcp_fsf_req *req;
518
519 if (!act->fsf_req_id)
520 return;
521
522 spin_lock(&adapter->req_list->lock);
523 req = _zfcp_reqlist_find(adapter->req_list, act->fsf_req_id);
524 if (req && req->erp_action == act) {
525 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
526 ZFCP_STATUS_ERP_TIMEDOUT)) {
527 req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
528 zfcp_dbf_rec_run("erscf_1", act);
529 req->erp_action = NULL;
530 }
531 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
532 zfcp_dbf_rec_run("erscf_2", act);
533 if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
534 act->fsf_req_id = 0;
535 } else
536 act->fsf_req_id = 0;
537 spin_unlock(&adapter->req_list->lock);
538}
539
540
541
542
543
544
545void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
546{
547 struct zfcp_adapter *adapter = erp_action->adapter;
548 unsigned long flags;
549
550 write_lock_irqsave(&adapter->erp_lock, flags);
551 if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
552 erp_action->status |= set_mask;
553 zfcp_erp_action_ready(erp_action);
554 }
555 write_unlock_irqrestore(&adapter->erp_lock, flags);
556}
557
558
559
560
561
562void zfcp_erp_timeout_handler(unsigned long data)
563{
564 struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
565 zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
566}
567
568static void zfcp_erp_memwait_handler(unsigned long data)
569{
570 zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
571}
572
573static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
574{
575 init_timer(&erp_action->timer);
576 erp_action->timer.function = zfcp_erp_memwait_handler;
577 erp_action->timer.data = (unsigned long) erp_action;
578 erp_action->timer.expires = jiffies + HZ;
579 add_timer(&erp_action->timer);
580}
581
582static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
583 int clear, char *id)
584{
585 struct zfcp_port *port;
586
587 read_lock(&adapter->port_list_lock);
588 list_for_each_entry(port, &adapter->port_list, list)
589 _zfcp_erp_port_reopen(port, clear, id);
590 read_unlock(&adapter->port_list_lock);
591}
592
593static void _zfcp_erp_lun_reopen_all(struct zfcp_port *port, int clear,
594 char *id)
595{
596 struct scsi_device *sdev;
597
598 spin_lock(port->adapter->scsi_host->host_lock);
599 __shost_for_each_device(sdev, port->adapter->scsi_host)
600 if (sdev_to_zfcp(sdev)->port == port)
601 _zfcp_erp_lun_reopen(sdev, clear, id, 0);
602 spin_unlock(port->adapter->scsi_host->host_lock);
603}
604
605static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
606{
607 switch (act->action) {
608 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
609 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1");
610 break;
611 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
612 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2");
613 break;
614 case ZFCP_ERP_ACTION_REOPEN_PORT:
615 _zfcp_erp_port_reopen(act->port, 0, "ersff_3");
616 break;
617 case ZFCP_ERP_ACTION_REOPEN_LUN:
618 _zfcp_erp_lun_reopen(act->sdev, 0, "ersff_4", 0);
619 break;
620 }
621}
622
623static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
624{
625 switch (act->action) {
626 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
627 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1");
628 break;
629 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
630 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2");
631 break;
632 case ZFCP_ERP_ACTION_REOPEN_PORT:
633 _zfcp_erp_lun_reopen_all(act->port, 0, "ersfs_3");
634 break;
635 }
636}
637
638static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
639{
640 unsigned long flags;
641
642 read_lock_irqsave(&adapter->erp_lock, flags);
643 if (list_empty(&adapter->erp_ready_head) &&
644 list_empty(&adapter->erp_running_head)) {
645 atomic_andnot(ZFCP_STATUS_ADAPTER_ERP_PENDING,
646 &adapter->status);
647 wake_up(&adapter->erp_done_wqh);
648 }
649 read_unlock_irqrestore(&adapter->erp_lock, flags);
650}
651
652static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
653{
654 struct zfcp_port *port;
655 port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
656 adapter->peer_d_id);
657 if (IS_ERR(port))
658 return;
659 _zfcp_erp_port_reopen(port, 0, "ereptp1");
660}
661
662static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
663{
664 int retries;
665 int sleep = 1;
666 struct zfcp_adapter *adapter = erp_action->adapter;
667
668 atomic_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
669
670 for (retries = 7; retries; retries--) {
671 atomic_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
672 &adapter->status);
673 write_lock_irq(&adapter->erp_lock);
674 zfcp_erp_action_to_running(erp_action);
675 write_unlock_irq(&adapter->erp_lock);
676 if (zfcp_fsf_exchange_config_data(erp_action)) {
677 atomic_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
678 &adapter->status);
679 return ZFCP_ERP_FAILED;
680 }
681
682 wait_event(adapter->erp_ready_wq,
683 !list_empty(&adapter->erp_ready_head));
684 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
685 break;
686
687 if (!(atomic_read(&adapter->status) &
688 ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
689 break;
690
691 ssleep(sleep);
692 sleep *= 2;
693 }
694
695 atomic_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
696 &adapter->status);
697
698 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
699 return ZFCP_ERP_FAILED;
700
701 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
702 zfcp_erp_enqueue_ptp_port(adapter);
703
704 return ZFCP_ERP_SUCCEEDED;
705}
706
707static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
708{
709 int ret;
710 struct zfcp_adapter *adapter = act->adapter;
711
712 write_lock_irq(&adapter->erp_lock);
713 zfcp_erp_action_to_running(act);
714 write_unlock_irq(&adapter->erp_lock);
715
716 ret = zfcp_fsf_exchange_port_data(act);
717 if (ret == -EOPNOTSUPP)
718 return ZFCP_ERP_SUCCEEDED;
719 if (ret)
720 return ZFCP_ERP_FAILED;
721
722 zfcp_dbf_rec_run("erasox1", act);
723 wait_event(adapter->erp_ready_wq,
724 !list_empty(&adapter->erp_ready_head));
725 zfcp_dbf_rec_run("erasox2", act);
726 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
727 return ZFCP_ERP_FAILED;
728
729 return ZFCP_ERP_SUCCEEDED;
730}
731
732static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
733{
734 if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
735 return ZFCP_ERP_FAILED;
736
737 if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
738 return ZFCP_ERP_FAILED;
739
740 if (mempool_resize(act->adapter->pool.sr_data,
741 act->adapter->stat_read_buf_num))
742 return ZFCP_ERP_FAILED;
743
744 if (mempool_resize(act->adapter->pool.status_read_req,
745 act->adapter->stat_read_buf_num))
746 return ZFCP_ERP_FAILED;
747
748 atomic_set(&act->adapter->stat_miss, act->adapter->stat_read_buf_num);
749 if (zfcp_status_read_refill(act->adapter))
750 return ZFCP_ERP_FAILED;
751
752 return ZFCP_ERP_SUCCEEDED;
753}
754
755static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
756{
757 struct zfcp_adapter *adapter = act->adapter;
758
759
760 zfcp_qdio_close(adapter->qdio);
761 zfcp_fsf_req_dismiss_all(adapter);
762 adapter->fsf_req_seq_no = 0;
763 zfcp_fc_wka_ports_force_offline(adapter->gs);
764
765 zfcp_erp_clear_adapter_status(adapter, ZFCP_STATUS_COMMON_OPEN);
766
767 atomic_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
768 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
769}
770
771static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
772{
773 struct zfcp_adapter *adapter = act->adapter;
774
775 if (zfcp_qdio_open(adapter->qdio)) {
776 atomic_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
777 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
778 &adapter->status);
779 return ZFCP_ERP_FAILED;
780 }
781
782 if (zfcp_erp_adapter_strategy_open_fsf(act)) {
783 zfcp_erp_adapter_strategy_close(act);
784 return ZFCP_ERP_FAILED;
785 }
786
787 atomic_or(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
788
789 return ZFCP_ERP_SUCCEEDED;
790}
791
792static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
793{
794 struct zfcp_adapter *adapter = act->adapter;
795
796 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
797 zfcp_erp_adapter_strategy_close(act);
798 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
799 return ZFCP_ERP_EXIT;
800 }
801
802 if (zfcp_erp_adapter_strategy_open(act)) {
803 ssleep(8);
804 return ZFCP_ERP_FAILED;
805 }
806
807 return ZFCP_ERP_SUCCEEDED;
808}
809
810static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
811{
812 int retval;
813
814 retval = zfcp_fsf_close_physical_port(act);
815 if (retval == -ENOMEM)
816 return ZFCP_ERP_NOMEM;
817 act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
818 if (retval)
819 return ZFCP_ERP_FAILED;
820
821 return ZFCP_ERP_CONTINUES;
822}
823
824static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
825{
826 struct zfcp_port *port = erp_action->port;
827 int status = atomic_read(&port->status);
828
829 switch (erp_action->step) {
830 case ZFCP_ERP_STEP_UNINITIALIZED:
831 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
832 (status & ZFCP_STATUS_COMMON_OPEN))
833 return zfcp_erp_port_forced_strategy_close(erp_action);
834 else
835 return ZFCP_ERP_FAILED;
836
837 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
838 if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
839 return ZFCP_ERP_SUCCEEDED;
840 }
841 return ZFCP_ERP_FAILED;
842}
843
844static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
845{
846 int retval;
847
848 retval = zfcp_fsf_close_port(erp_action);
849 if (retval == -ENOMEM)
850 return ZFCP_ERP_NOMEM;
851 erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
852 if (retval)
853 return ZFCP_ERP_FAILED;
854 return ZFCP_ERP_CONTINUES;
855}
856
857static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
858{
859 int retval;
860
861 retval = zfcp_fsf_open_port(erp_action);
862 if (retval == -ENOMEM)
863 return ZFCP_ERP_NOMEM;
864 erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
865 if (retval)
866 return ZFCP_ERP_FAILED;
867 return ZFCP_ERP_CONTINUES;
868}
869
870static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
871{
872 struct zfcp_adapter *adapter = act->adapter;
873 struct zfcp_port *port = act->port;
874
875 if (port->wwpn != adapter->peer_wwpn) {
876 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
877 return ZFCP_ERP_FAILED;
878 }
879 port->d_id = adapter->peer_d_id;
880 return zfcp_erp_port_strategy_open_port(act);
881}
882
883static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
884{
885 struct zfcp_adapter *adapter = act->adapter;
886 struct zfcp_port *port = act->port;
887 int p_status = atomic_read(&port->status);
888
889 switch (act->step) {
890 case ZFCP_ERP_STEP_UNINITIALIZED:
891 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
892 case ZFCP_ERP_STEP_PORT_CLOSING:
893 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
894 return zfcp_erp_open_ptp_port(act);
895 if (!port->d_id) {
896 zfcp_fc_trigger_did_lookup(port);
897 return ZFCP_ERP_EXIT;
898 }
899 return zfcp_erp_port_strategy_open_port(act);
900
901 case ZFCP_ERP_STEP_PORT_OPENING:
902
903 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
904 if (!port->d_id) {
905 zfcp_fc_trigger_did_lookup(port);
906 return ZFCP_ERP_EXIT;
907 }
908 return ZFCP_ERP_SUCCEEDED;
909 }
910 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
911 port->d_id = 0;
912 return ZFCP_ERP_FAILED;
913 }
914
915 }
916 return ZFCP_ERP_FAILED;
917}
918
919static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
920{
921 struct zfcp_port *port = erp_action->port;
922 int p_status = atomic_read(&port->status);
923
924 if ((p_status & ZFCP_STATUS_COMMON_NOESC) &&
925 !(p_status & ZFCP_STATUS_COMMON_OPEN))
926 goto close_init_done;
927
928 switch (erp_action->step) {
929 case ZFCP_ERP_STEP_UNINITIALIZED:
930 if (p_status & ZFCP_STATUS_COMMON_OPEN)
931 return zfcp_erp_port_strategy_close(erp_action);
932 break;
933
934 case ZFCP_ERP_STEP_PORT_CLOSING:
935 if (p_status & ZFCP_STATUS_COMMON_OPEN)
936 return ZFCP_ERP_FAILED;
937 break;
938 }
939
940close_init_done:
941 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
942 return ZFCP_ERP_EXIT;
943
944 return zfcp_erp_port_strategy_open_common(erp_action);
945}
946
947static void zfcp_erp_lun_strategy_clearstati(struct scsi_device *sdev)
948{
949 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
950
951 atomic_andnot(ZFCP_STATUS_COMMON_ACCESS_DENIED,
952 &zfcp_sdev->status);
953}
954
955static int zfcp_erp_lun_strategy_close(struct zfcp_erp_action *erp_action)
956{
957 int retval = zfcp_fsf_close_lun(erp_action);
958 if (retval == -ENOMEM)
959 return ZFCP_ERP_NOMEM;
960 erp_action->step = ZFCP_ERP_STEP_LUN_CLOSING;
961 if (retval)
962 return ZFCP_ERP_FAILED;
963 return ZFCP_ERP_CONTINUES;
964}
965
966static int zfcp_erp_lun_strategy_open(struct zfcp_erp_action *erp_action)
967{
968 int retval = zfcp_fsf_open_lun(erp_action);
969 if (retval == -ENOMEM)
970 return ZFCP_ERP_NOMEM;
971 erp_action->step = ZFCP_ERP_STEP_LUN_OPENING;
972 if (retval)
973 return ZFCP_ERP_FAILED;
974 return ZFCP_ERP_CONTINUES;
975}
976
977static int zfcp_erp_lun_strategy(struct zfcp_erp_action *erp_action)
978{
979 struct scsi_device *sdev = erp_action->sdev;
980 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
981
982 switch (erp_action->step) {
983 case ZFCP_ERP_STEP_UNINITIALIZED:
984 zfcp_erp_lun_strategy_clearstati(sdev);
985 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
986 return zfcp_erp_lun_strategy_close(erp_action);
987
988 case ZFCP_ERP_STEP_LUN_CLOSING:
989 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
990 return ZFCP_ERP_FAILED;
991 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
992 return ZFCP_ERP_EXIT;
993 return zfcp_erp_lun_strategy_open(erp_action);
994
995 case ZFCP_ERP_STEP_LUN_OPENING:
996 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
997 return ZFCP_ERP_SUCCEEDED;
998 }
999 return ZFCP_ERP_FAILED;
1000}
1001
1002static int zfcp_erp_strategy_check_lun(struct scsi_device *sdev, int result)
1003{
1004 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1005
1006 switch (result) {
1007 case ZFCP_ERP_SUCCEEDED :
1008 atomic_set(&zfcp_sdev->erp_counter, 0);
1009 zfcp_erp_lun_unblock(sdev);
1010 break;
1011 case ZFCP_ERP_FAILED :
1012 atomic_inc(&zfcp_sdev->erp_counter);
1013 if (atomic_read(&zfcp_sdev->erp_counter) > ZFCP_MAX_ERPS) {
1014 dev_err(&zfcp_sdev->port->adapter->ccw_device->dev,
1015 "ERP failed for LUN 0x%016Lx on "
1016 "port 0x%016Lx\n",
1017 (unsigned long long)zfcp_scsi_dev_lun(sdev),
1018 (unsigned long long)zfcp_sdev->port->wwpn);
1019 zfcp_erp_set_lun_status(sdev,
1020 ZFCP_STATUS_COMMON_ERP_FAILED);
1021 }
1022 break;
1023 }
1024
1025 if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1026 zfcp_erp_lun_block(sdev, 0);
1027 result = ZFCP_ERP_EXIT;
1028 }
1029 return result;
1030}
1031
1032static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1033{
1034 switch (result) {
1035 case ZFCP_ERP_SUCCEEDED :
1036 atomic_set(&port->erp_counter, 0);
1037 zfcp_erp_port_unblock(port);
1038 break;
1039
1040 case ZFCP_ERP_FAILED :
1041 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1042 zfcp_erp_port_block(port, 0);
1043 result = ZFCP_ERP_EXIT;
1044 }
1045 atomic_inc(&port->erp_counter);
1046 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1047 dev_err(&port->adapter->ccw_device->dev,
1048 "ERP failed for remote port 0x%016Lx\n",
1049 (unsigned long long)port->wwpn);
1050 zfcp_erp_set_port_status(port,
1051 ZFCP_STATUS_COMMON_ERP_FAILED);
1052 }
1053 break;
1054 }
1055
1056 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1057 zfcp_erp_port_block(port, 0);
1058 result = ZFCP_ERP_EXIT;
1059 }
1060 return result;
1061}
1062
1063static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1064 int result)
1065{
1066 switch (result) {
1067 case ZFCP_ERP_SUCCEEDED :
1068 atomic_set(&adapter->erp_counter, 0);
1069 zfcp_erp_adapter_unblock(adapter);
1070 break;
1071
1072 case ZFCP_ERP_FAILED :
1073 atomic_inc(&adapter->erp_counter);
1074 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1075 dev_err(&adapter->ccw_device->dev,
1076 "ERP cannot recover an error "
1077 "on the FCP device\n");
1078 zfcp_erp_set_adapter_status(adapter,
1079 ZFCP_STATUS_COMMON_ERP_FAILED);
1080 }
1081 break;
1082 }
1083
1084 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1085 zfcp_erp_adapter_block(adapter, 0);
1086 result = ZFCP_ERP_EXIT;
1087 }
1088 return result;
1089}
1090
1091static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1092 int result)
1093{
1094 struct zfcp_adapter *adapter = erp_action->adapter;
1095 struct zfcp_port *port = erp_action->port;
1096 struct scsi_device *sdev = erp_action->sdev;
1097
1098 switch (erp_action->action) {
1099
1100 case ZFCP_ERP_ACTION_REOPEN_LUN:
1101 result = zfcp_erp_strategy_check_lun(sdev, result);
1102 break;
1103
1104 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1105 case ZFCP_ERP_ACTION_REOPEN_PORT:
1106 result = zfcp_erp_strategy_check_port(port, result);
1107 break;
1108
1109 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1110 result = zfcp_erp_strategy_check_adapter(adapter, result);
1111 break;
1112 }
1113 return result;
1114}
1115
1116static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1117{
1118 int status = atomic_read(target_status);
1119
1120 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1121 (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1122 return 1;
1123
1124 if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1125 !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1126 return 1;
1127
1128 return 0;
1129}
1130
1131static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1132{
1133 int action = act->action;
1134 struct zfcp_adapter *adapter = act->adapter;
1135 struct zfcp_port *port = act->port;
1136 struct scsi_device *sdev = act->sdev;
1137 struct zfcp_scsi_dev *zfcp_sdev;
1138 u32 erp_status = act->status;
1139
1140 switch (action) {
1141 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1142 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1143 _zfcp_erp_adapter_reopen(adapter,
1144 ZFCP_STATUS_COMMON_ERP_FAILED,
1145 "ersscg1");
1146 return ZFCP_ERP_EXIT;
1147 }
1148 break;
1149
1150 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1151 case ZFCP_ERP_ACTION_REOPEN_PORT:
1152 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1153 _zfcp_erp_port_reopen(port,
1154 ZFCP_STATUS_COMMON_ERP_FAILED,
1155 "ersscg2");
1156 return ZFCP_ERP_EXIT;
1157 }
1158 break;
1159
1160 case ZFCP_ERP_ACTION_REOPEN_LUN:
1161 zfcp_sdev = sdev_to_zfcp(sdev);
1162 if (zfcp_erp_strat_change_det(&zfcp_sdev->status, erp_status)) {
1163 _zfcp_erp_lun_reopen(sdev,
1164 ZFCP_STATUS_COMMON_ERP_FAILED,
1165 "ersscg3", 0);
1166 return ZFCP_ERP_EXIT;
1167 }
1168 break;
1169 }
1170 return ret;
1171}
1172
1173static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1174{
1175 struct zfcp_adapter *adapter = erp_action->adapter;
1176 struct zfcp_scsi_dev *zfcp_sdev;
1177
1178 adapter->erp_total_count--;
1179 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1180 adapter->erp_low_mem_count--;
1181 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1182 }
1183
1184 list_del(&erp_action->list);
1185 zfcp_dbf_rec_run("eractd1", erp_action);
1186
1187 switch (erp_action->action) {
1188 case ZFCP_ERP_ACTION_REOPEN_LUN:
1189 zfcp_sdev = sdev_to_zfcp(erp_action->sdev);
1190 atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE,
1191 &zfcp_sdev->status);
1192 break;
1193
1194 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1195 case ZFCP_ERP_ACTION_REOPEN_PORT:
1196 atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE,
1197 &erp_action->port->status);
1198 break;
1199
1200 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1201 atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE,
1202 &erp_action->adapter->status);
1203 break;
1204 }
1205}
1206
1207
1208
1209
1210
1211static void zfcp_erp_try_rport_unblock(struct zfcp_port *port)
1212{
1213 unsigned long flags;
1214 struct zfcp_adapter *adapter = port->adapter;
1215 int port_status;
1216 struct Scsi_Host *shost = adapter->scsi_host;
1217 struct scsi_device *sdev;
1218
1219 write_lock_irqsave(&adapter->erp_lock, flags);
1220 port_status = atomic_read(&port->status);
1221 if ((port_status & ZFCP_STATUS_COMMON_UNBLOCKED) == 0 ||
1222 (port_status & (ZFCP_STATUS_COMMON_ERP_INUSE |
1223 ZFCP_STATUS_COMMON_ERP_FAILED)) != 0) {
1224
1225
1226
1227 zfcp_dbf_rec_run_lvl(4, "ertru_p", &port->erp_action);
1228 write_unlock_irqrestore(&adapter->erp_lock, flags);
1229 return;
1230 }
1231 spin_lock(shost->host_lock);
1232 __shost_for_each_device(sdev, shost) {
1233 struct zfcp_scsi_dev *zsdev = sdev_to_zfcp(sdev);
1234 int lun_status;
1235
1236 if (zsdev->port != port)
1237 continue;
1238
1239 lun_status = atomic_read(&zsdev->status);
1240 if ((lun_status & ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
1241 continue;
1242
1243 if ((lun_status & ZFCP_STATUS_COMMON_UNBLOCKED) == 0 ||
1244 (lun_status & ZFCP_STATUS_COMMON_ERP_INUSE) != 0) {
1245
1246
1247
1248
1249 zfcp_dbf_rec_run_lvl(4, "ertru_l", &zsdev->erp_action);
1250 spin_unlock(shost->host_lock);
1251 write_unlock_irqrestore(&adapter->erp_lock, flags);
1252 return;
1253 }
1254 }
1255
1256
1257
1258 zfcp_scsi_schedule_rport_register(port);
1259 spin_unlock(shost->host_lock);
1260 write_unlock_irqrestore(&adapter->erp_lock, flags);
1261}
1262
1263static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1264{
1265 struct zfcp_adapter *adapter = act->adapter;
1266 struct zfcp_port *port = act->port;
1267 struct scsi_device *sdev = act->sdev;
1268
1269 switch (act->action) {
1270 case ZFCP_ERP_ACTION_REOPEN_LUN:
1271 if (!(act->status & ZFCP_STATUS_ERP_NO_REF))
1272 scsi_device_put(sdev);
1273 zfcp_erp_try_rport_unblock(port);
1274 break;
1275
1276 case ZFCP_ERP_ACTION_REOPEN_PORT:
1277
1278
1279
1280
1281
1282 if (act->step != ZFCP_ERP_STEP_UNINITIALIZED)
1283 if (result == ZFCP_ERP_SUCCEEDED)
1284 zfcp_erp_try_rport_unblock(port);
1285
1286 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1287 put_device(&port->dev);
1288 break;
1289
1290 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1291 if (result == ZFCP_ERP_SUCCEEDED) {
1292 register_service_level(&adapter->service_level);
1293 zfcp_fc_conditional_port_scan(adapter);
1294 queue_work(adapter->work_queue, &adapter->ns_up_work);
1295 } else
1296 unregister_service_level(&adapter->service_level);
1297
1298 kref_put(&adapter->ref, zfcp_adapter_release);
1299 break;
1300 }
1301}
1302
1303static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1304{
1305 switch (erp_action->action) {
1306 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1307 return zfcp_erp_adapter_strategy(erp_action);
1308 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1309 return zfcp_erp_port_forced_strategy(erp_action);
1310 case ZFCP_ERP_ACTION_REOPEN_PORT:
1311 return zfcp_erp_port_strategy(erp_action);
1312 case ZFCP_ERP_ACTION_REOPEN_LUN:
1313 return zfcp_erp_lun_strategy(erp_action);
1314 }
1315 return ZFCP_ERP_FAILED;
1316}
1317
1318static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1319{
1320 int retval;
1321 unsigned long flags;
1322 struct zfcp_adapter *adapter = erp_action->adapter;
1323
1324 kref_get(&adapter->ref);
1325
1326 write_lock_irqsave(&adapter->erp_lock, flags);
1327 zfcp_erp_strategy_check_fsfreq(erp_action);
1328
1329 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1330 zfcp_erp_action_dequeue(erp_action);
1331 retval = ZFCP_ERP_DISMISSED;
1332 goto unlock;
1333 }
1334
1335 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
1336 retval = ZFCP_ERP_FAILED;
1337 goto check_target;
1338 }
1339
1340 zfcp_erp_action_to_running(erp_action);
1341
1342
1343 write_unlock_irqrestore(&adapter->erp_lock, flags);
1344 retval = zfcp_erp_strategy_do_action(erp_action);
1345 write_lock_irqsave(&adapter->erp_lock, flags);
1346
1347 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1348 retval = ZFCP_ERP_CONTINUES;
1349
1350 switch (retval) {
1351 case ZFCP_ERP_NOMEM:
1352 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1353 ++adapter->erp_low_mem_count;
1354 erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1355 }
1356 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1357 _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1");
1358 else {
1359 zfcp_erp_strategy_memwait(erp_action);
1360 retval = ZFCP_ERP_CONTINUES;
1361 }
1362 goto unlock;
1363
1364 case ZFCP_ERP_CONTINUES:
1365 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1366 --adapter->erp_low_mem_count;
1367 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1368 }
1369 goto unlock;
1370 }
1371
1372check_target:
1373 retval = zfcp_erp_strategy_check_target(erp_action, retval);
1374 zfcp_erp_action_dequeue(erp_action);
1375 retval = zfcp_erp_strategy_statechange(erp_action, retval);
1376 if (retval == ZFCP_ERP_EXIT)
1377 goto unlock;
1378 if (retval == ZFCP_ERP_SUCCEEDED)
1379 zfcp_erp_strategy_followup_success(erp_action);
1380 if (retval == ZFCP_ERP_FAILED)
1381 zfcp_erp_strategy_followup_failed(erp_action);
1382
1383 unlock:
1384 write_unlock_irqrestore(&adapter->erp_lock, flags);
1385
1386 if (retval != ZFCP_ERP_CONTINUES)
1387 zfcp_erp_action_cleanup(erp_action, retval);
1388
1389 kref_put(&adapter->ref, zfcp_adapter_release);
1390 return retval;
1391}
1392
1393static int zfcp_erp_thread(void *data)
1394{
1395 struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1396 struct list_head *next;
1397 struct zfcp_erp_action *act;
1398 unsigned long flags;
1399
1400 for (;;) {
1401 wait_event_interruptible(adapter->erp_ready_wq,
1402 !list_empty(&adapter->erp_ready_head) ||
1403 kthread_should_stop());
1404
1405 if (kthread_should_stop())
1406 break;
1407
1408 write_lock_irqsave(&adapter->erp_lock, flags);
1409 next = adapter->erp_ready_head.next;
1410 write_unlock_irqrestore(&adapter->erp_lock, flags);
1411
1412 if (next != &adapter->erp_ready_head) {
1413 act = list_entry(next, struct zfcp_erp_action, list);
1414
1415
1416 if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1417 zfcp_erp_wakeup(adapter);
1418 }
1419 }
1420
1421 return 0;
1422}
1423
1424
1425
1426
1427
1428
1429
1430int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1431{
1432 struct task_struct *thread;
1433
1434 thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
1435 dev_name(&adapter->ccw_device->dev));
1436 if (IS_ERR(thread)) {
1437 dev_err(&adapter->ccw_device->dev,
1438 "Creating an ERP thread for the FCP device failed.\n");
1439 return PTR_ERR(thread);
1440 }
1441
1442 adapter->erp_thread = thread;
1443 return 0;
1444}
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1456{
1457 kthread_stop(adapter->erp_thread);
1458 adapter->erp_thread = NULL;
1459 WARN_ON(!list_empty(&adapter->erp_ready_head));
1460 WARN_ON(!list_empty(&adapter->erp_running_head));
1461}
1462
1463
1464
1465
1466
1467void zfcp_erp_wait(struct zfcp_adapter *adapter)
1468{
1469 wait_event(adapter->erp_done_wqh,
1470 !(atomic_read(&adapter->status) &
1471 ZFCP_STATUS_ADAPTER_ERP_PENDING));
1472}
1473
1474
1475
1476
1477
1478
1479
1480
1481void zfcp_erp_set_adapter_status(struct zfcp_adapter *adapter, u32 mask)
1482{
1483 struct zfcp_port *port;
1484 struct scsi_device *sdev;
1485 unsigned long flags;
1486 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1487
1488 atomic_or(mask, &adapter->status);
1489
1490 if (!common_mask)
1491 return;
1492
1493 read_lock_irqsave(&adapter->port_list_lock, flags);
1494 list_for_each_entry(port, &adapter->port_list, list)
1495 atomic_or(common_mask, &port->status);
1496 read_unlock_irqrestore(&adapter->port_list_lock, flags);
1497
1498 spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
1499 __shost_for_each_device(sdev, adapter->scsi_host)
1500 atomic_or(common_mask, &sdev_to_zfcp(sdev)->status);
1501 spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
1502}
1503
1504
1505
1506
1507
1508
1509
1510
1511void zfcp_erp_clear_adapter_status(struct zfcp_adapter *adapter, u32 mask)
1512{
1513 struct zfcp_port *port;
1514 struct scsi_device *sdev;
1515 unsigned long flags;
1516 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1517 u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
1518
1519 atomic_andnot(mask, &adapter->status);
1520
1521 if (!common_mask)
1522 return;
1523
1524 if (clear_counter)
1525 atomic_set(&adapter->erp_counter, 0);
1526
1527 read_lock_irqsave(&adapter->port_list_lock, flags);
1528 list_for_each_entry(port, &adapter->port_list, list) {
1529 atomic_andnot(common_mask, &port->status);
1530 if (clear_counter)
1531 atomic_set(&port->erp_counter, 0);
1532 }
1533 read_unlock_irqrestore(&adapter->port_list_lock, flags);
1534
1535 spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
1536 __shost_for_each_device(sdev, adapter->scsi_host) {
1537 atomic_andnot(common_mask, &sdev_to_zfcp(sdev)->status);
1538 if (clear_counter)
1539 atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
1540 }
1541 spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
1542}
1543
1544
1545
1546
1547
1548
1549
1550
1551void zfcp_erp_set_port_status(struct zfcp_port *port, u32 mask)
1552{
1553 struct scsi_device *sdev;
1554 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1555 unsigned long flags;
1556
1557 atomic_or(mask, &port->status);
1558
1559 if (!common_mask)
1560 return;
1561
1562 spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
1563 __shost_for_each_device(sdev, port->adapter->scsi_host)
1564 if (sdev_to_zfcp(sdev)->port == port)
1565 atomic_or(common_mask,
1566 &sdev_to_zfcp(sdev)->status);
1567 spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
1568}
1569
1570
1571
1572
1573
1574
1575
1576
1577void zfcp_erp_clear_port_status(struct zfcp_port *port, u32 mask)
1578{
1579 struct scsi_device *sdev;
1580 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1581 u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
1582 unsigned long flags;
1583
1584 atomic_andnot(mask, &port->status);
1585
1586 if (!common_mask)
1587 return;
1588
1589 if (clear_counter)
1590 atomic_set(&port->erp_counter, 0);
1591
1592 spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
1593 __shost_for_each_device(sdev, port->adapter->scsi_host)
1594 if (sdev_to_zfcp(sdev)->port == port) {
1595 atomic_andnot(common_mask,
1596 &sdev_to_zfcp(sdev)->status);
1597 if (clear_counter)
1598 atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
1599 }
1600 spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
1601}
1602
1603
1604
1605
1606
1607
1608void zfcp_erp_set_lun_status(struct scsi_device *sdev, u32 mask)
1609{
1610 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1611
1612 atomic_or(mask, &zfcp_sdev->status);
1613}
1614
1615
1616
1617
1618
1619
1620void zfcp_erp_clear_lun_status(struct scsi_device *sdev, u32 mask)
1621{
1622 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1623
1624 atomic_andnot(mask, &zfcp_sdev->status);
1625
1626 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1627 atomic_set(&zfcp_sdev->erp_counter, 0);
1628}
1629
1630
