4 * Error Recovery Procedures (ERP).
6 * Copyright IBM Corporation 2002, 2009
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #define ZFCP_MAX_ERPS 3
16 enum zfcp_erp_act_flags {
17 ZFCP_STATUS_ERP_TIMEDOUT = 0x10000000,
18 ZFCP_STATUS_ERP_CLOSE_ONLY = 0x01000000,
19 ZFCP_STATUS_ERP_DISMISSING = 0x00100000,
20 ZFCP_STATUS_ERP_DISMISSED = 0x00200000,
21 ZFCP_STATUS_ERP_LOWMEM = 0x00400000,
25 ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
26 ZFCP_ERP_STEP_FSF_XCONFIG = 0x0001,
27 ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
28 ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
29 ZFCP_ERP_STEP_NAMESERVER_LOOKUP = 0x0400,
30 ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
31 ZFCP_ERP_STEP_UNIT_CLOSING = 0x1000,
32 ZFCP_ERP_STEP_UNIT_OPENING = 0x2000,
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,
42 enum zfcp_erp_act_state {
43 ZFCP_ERP_ACTION_RUNNING = 1,
44 ZFCP_ERP_ACTION_READY = 2,
47 enum zfcp_erp_act_result {
48 ZFCP_ERP_SUCCEEDED = 0,
50 ZFCP_ERP_CONTINUES = 2,
52 ZFCP_ERP_DISMISSED = 4,
56 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
58 zfcp_erp_modify_adapter_status(adapter, "erablk1", NULL,
59 ZFCP_STATUS_COMMON_UNBLOCKED | mask,
63 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
65 struct zfcp_erp_action *curr_act;
67 list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
69 return ZFCP_ERP_ACTION_RUNNING;
73 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
75 struct zfcp_adapter *adapter = act->adapter;
77 list_move(&act->list, &act->adapter->erp_ready_head);
78 zfcp_rec_dbf_event_action("erardy1", act);
79 up(&adapter->erp_ready_sem);
80 zfcp_rec_dbf_event_thread("erardy2", adapter);
83 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
85 act->status |= ZFCP_STATUS_ERP_DISMISSED;
86 if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
87 zfcp_erp_action_ready(act);
90 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
92 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
93 zfcp_erp_action_dismiss(&unit->erp_action);
96 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
98 struct zfcp_unit *unit;
100 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
101 zfcp_erp_action_dismiss(&port->erp_action);
103 list_for_each_entry(unit, &port->unit_list_head, list)
104 zfcp_erp_action_dismiss_unit(unit);
107 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
109 struct zfcp_port *port;
111 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
112 zfcp_erp_action_dismiss(&adapter->erp_action);
114 list_for_each_entry(port, &adapter->port_list_head, list)
115 zfcp_erp_action_dismiss_port(port);
118 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
119 struct zfcp_port *port,
120 struct zfcp_unit *unit)
123 int u_status, p_status, a_status;
126 case ZFCP_ERP_ACTION_REOPEN_UNIT:
127 u_status = atomic_read(&unit->status);
128 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
130 p_status = atomic_read(&port->status);
131 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
132 p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
134 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
135 need = ZFCP_ERP_ACTION_REOPEN_PORT;
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)
142 a_status = atomic_read(&adapter->status);
143 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
144 a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
146 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
147 need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
149 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
150 a_status = atomic_read(&adapter->status);
151 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
158 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
159 struct zfcp_adapter *adapter,
160 struct zfcp_port *port,
161 struct zfcp_unit *unit)
163 struct zfcp_erp_action *erp_action;
167 case ZFCP_ERP_ACTION_REOPEN_UNIT:
169 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
170 erp_action = &unit->erp_action;
171 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
172 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
175 case ZFCP_ERP_ACTION_REOPEN_PORT:
176 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
178 zfcp_erp_action_dismiss_port(port);
179 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
180 erp_action = &port->erp_action;
181 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
182 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
185 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
186 zfcp_adapter_get(adapter);
187 zfcp_erp_action_dismiss_adapter(adapter);
188 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
189 erp_action = &adapter->erp_action;
190 if (!(atomic_read(&adapter->status) &
191 ZFCP_STATUS_COMMON_RUNNING))
192 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
199 memset(erp_action, 0, sizeof(struct zfcp_erp_action));
200 erp_action->adapter = adapter;
201 erp_action->port = port;
202 erp_action->unit = unit;
203 erp_action->action = need;
204 erp_action->status = status;
209 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
210 struct zfcp_port *port,
211 struct zfcp_unit *unit, char *id, void *ref)
213 int retval = 1, need;
214 struct zfcp_erp_action *act = NULL;
216 if (!(atomic_read(&adapter->status) &
217 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP))
220 need = zfcp_erp_required_act(want, adapter, port, unit);
224 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
225 act = zfcp_erp_setup_act(need, adapter, port, unit);
228 ++adapter->erp_total_count;
229 list_add_tail(&act->list, &adapter->erp_ready_head);
230 up(&adapter->erp_ready_sem);
231 zfcp_rec_dbf_event_thread("eracte1", adapter);
234 zfcp_rec_dbf_event_trigger(id, ref, want, need, act,
235 adapter, port, unit);
239 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
240 int clear_mask, char *id, void *ref)
242 zfcp_erp_adapter_block(adapter, clear_mask);
243 zfcp_scsi_schedule_rports_block(adapter);
245 /* ensure propagation of failed status to new devices */
246 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
247 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
250 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
251 adapter, NULL, NULL, id, ref);
255 * zfcp_erp_adapter_reopen - Reopen adapter.
256 * @adapter: Adapter to reopen.
257 * @clear: Status flags to clear.
258 * @id: Id for debug trace event.
259 * @ref: Reference for debug trace event.
261 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
266 read_lock_irqsave(&zfcp_data.config_lock, flags);
267 write_lock(&adapter->erp_lock);
268 _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
269 write_unlock(&adapter->erp_lock);
270 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
274 * zfcp_erp_adapter_shutdown - Shutdown adapter.
275 * @adapter: Adapter to shut down.
276 * @clear: Status flags to clear.
277 * @id: Id for debug trace event.
278 * @ref: Reference for debug trace event.
280 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
283 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
284 zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
288 * zfcp_erp_port_shutdown - Shutdown port
289 * @port: Port to shut down.
290 * @clear: Status flags to clear.
291 * @id: Id for debug trace event.
292 * @ref: Reference for debug trace event.
294 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id,
297 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
298 zfcp_erp_port_reopen(port, clear | flags, id, ref);
302 * zfcp_erp_unit_shutdown - Shutdown unit
303 * @unit: Unit to shut down.
304 * @clear: Status flags to clear.
305 * @id: Id for debug trace event.
306 * @ref: Reference for debug trace event.
308 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
311 int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
312 zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
315 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
317 zfcp_erp_modify_port_status(port, "erpblk1", NULL,
318 ZFCP_STATUS_COMMON_UNBLOCKED | clear,
322 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
323 int clear, char *id, void *ref)
325 zfcp_erp_port_block(port, clear);
326 zfcp_scsi_schedule_rport_block(port);
328 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
331 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
332 port->adapter, port, NULL, id, ref);
336 * zfcp_erp_port_forced_reopen - Forced close of port and open again
337 * @port: Port to force close and to reopen.
338 * @id: Id for debug trace event.
339 * @ref: Reference for debug trace event.
341 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id,
345 struct zfcp_adapter *adapter = port->adapter;
347 read_lock_irqsave(&zfcp_data.config_lock, flags);
348 write_lock(&adapter->erp_lock);
349 _zfcp_erp_port_forced_reopen(port, clear, id, ref);
350 write_unlock(&adapter->erp_lock);
351 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
354 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id,
357 zfcp_erp_port_block(port, clear);
358 zfcp_scsi_schedule_rport_block(port);
360 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
361 /* ensure propagation of failed status to new devices */
362 zfcp_erp_port_failed(port, "erpreo1", NULL);
366 return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
367 port->adapter, port, NULL, id, ref);
371 * zfcp_erp_port_reopen - trigger remote port recovery
372 * @port: port to recover
373 * @clear_mask: flags in port status to be cleared
375 * Returns 0 if recovery has been triggered, < 0 if not.
377 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
381 struct zfcp_adapter *adapter = port->adapter;
383 read_lock_irqsave(&zfcp_data.config_lock, flags);
384 write_lock(&adapter->erp_lock);
385 retval = _zfcp_erp_port_reopen(port, clear, id, ref);
386 write_unlock(&adapter->erp_lock);
387 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
392 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
394 zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
395 ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
399 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
402 struct zfcp_adapter *adapter = unit->port->adapter;
404 zfcp_erp_unit_block(unit, clear);
406 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
409 zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
410 adapter, unit->port, unit, id, ref);
414 * zfcp_erp_unit_reopen - initiate reopen of a unit
415 * @unit: unit to be reopened
416 * @clear_mask: specifies flags in unit status to be cleared
417 * Return: 0 on success, < 0 on error
419 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
423 struct zfcp_port *port = unit->port;
424 struct zfcp_adapter *adapter = port->adapter;
426 read_lock_irqsave(&zfcp_data.config_lock, flags);
427 write_lock(&adapter->erp_lock);
428 _zfcp_erp_unit_reopen(unit, clear, id, ref);
429 write_unlock(&adapter->erp_lock);
430 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
433 static int status_change_set(unsigned long mask, atomic_t *status)
435 return (atomic_read(status) ^ mask) & mask;
438 static int status_change_clear(unsigned long mask, atomic_t *status)
440 return atomic_read(status) & mask;
443 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
445 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
446 zfcp_rec_dbf_event_adapter("eraubl1", NULL, adapter);
447 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
450 static void zfcp_erp_port_unblock(struct zfcp_port *port)
452 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
453 zfcp_rec_dbf_event_port("erpubl1", NULL, port);
454 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
457 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
459 if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
460 zfcp_rec_dbf_event_unit("eruubl1", NULL, unit);
461 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
464 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
466 list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
467 zfcp_rec_dbf_event_action("erator1", erp_action);
470 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
472 struct zfcp_adapter *adapter = act->adapter;
477 spin_lock(&adapter->req_list_lock);
478 if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
479 act->fsf_req->erp_action == act) {
480 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
481 ZFCP_STATUS_ERP_TIMEDOUT)) {
482 act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
483 zfcp_rec_dbf_event_action("erscf_1", act);
484 act->fsf_req->erp_action = NULL;
486 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
487 zfcp_rec_dbf_event_action("erscf_2", act);
488 if (act->fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
489 ZFCP_STATUS_FSFREQ_DISMISSED))
493 spin_unlock(&adapter->req_list_lock);
497 * zfcp_erp_notify - Trigger ERP action.
498 * @erp_action: ERP action to continue.
499 * @set_mask: ERP action status flags to set.
501 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
503 struct zfcp_adapter *adapter = erp_action->adapter;
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);
511 write_unlock_irqrestore(&adapter->erp_lock, flags);
515 * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
516 * @data: ERP action (from timer data)
518 void zfcp_erp_timeout_handler(unsigned long data)
520 struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
521 zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
524 static void zfcp_erp_memwait_handler(unsigned long data)
526 zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
529 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
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);
538 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
539 int clear, char *id, void *ref)
541 struct zfcp_port *port;
543 list_for_each_entry(port, &adapter->port_list_head, list)
544 _zfcp_erp_port_reopen(port, clear, id, ref);
547 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
550 struct zfcp_unit *unit;
552 list_for_each_entry(unit, &port->unit_list_head, list)
553 _zfcp_erp_unit_reopen(unit, clear, id, ref);
556 static void zfcp_erp_strategy_followup_actions(struct zfcp_erp_action *act)
558 struct zfcp_adapter *adapter = act->adapter;
559 struct zfcp_port *port = act->port;
560 struct zfcp_unit *unit = act->unit;
561 u32 status = act->status;
563 /* initiate follow-up actions depending on success of finished action */
564 switch (act->action) {
566 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
567 if (status == ZFCP_ERP_SUCCEEDED)
568 _zfcp_erp_port_reopen_all(adapter, 0, "ersfa_1", NULL);
570 _zfcp_erp_adapter_reopen(adapter, 0, "ersfa_2", NULL);
573 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
574 if (status == ZFCP_ERP_SUCCEEDED)
575 _zfcp_erp_port_reopen(port, 0, "ersfa_3", NULL);
577 _zfcp_erp_adapter_reopen(adapter, 0, "ersfa_4", NULL);
580 case ZFCP_ERP_ACTION_REOPEN_PORT:
581 if (status == ZFCP_ERP_SUCCEEDED)
582 _zfcp_erp_unit_reopen_all(port, 0, "ersfa_5", NULL);
584 _zfcp_erp_port_forced_reopen(port, 0, "ersfa_6", NULL);
587 case ZFCP_ERP_ACTION_REOPEN_UNIT:
588 if (status != ZFCP_ERP_SUCCEEDED)
589 _zfcp_erp_port_reopen(unit->port, 0, "ersfa_7", NULL);
594 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
598 read_lock_irqsave(&zfcp_data.config_lock, flags);
599 read_lock(&adapter->erp_lock);
600 if (list_empty(&adapter->erp_ready_head) &&
601 list_empty(&adapter->erp_running_head)) {
602 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
604 wake_up(&adapter->erp_done_wqh);
606 read_unlock(&adapter->erp_lock);
607 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
610 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
612 if (zfcp_qdio_open(act->adapter))
613 return ZFCP_ERP_FAILED;
614 init_waitqueue_head(&act->adapter->request_wq);
615 atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
616 return ZFCP_ERP_SUCCEEDED;
619 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
621 struct zfcp_port *port;
622 port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
624 if (IS_ERR(port)) /* error or port already attached */
626 _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
629 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
633 struct zfcp_adapter *adapter = erp_action->adapter;
635 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
637 for (retries = 7; retries; retries--) {
638 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
640 write_lock_irq(&adapter->erp_lock);
641 zfcp_erp_action_to_running(erp_action);
642 write_unlock_irq(&adapter->erp_lock);
643 if (zfcp_fsf_exchange_config_data(erp_action)) {
644 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
646 return ZFCP_ERP_FAILED;
649 zfcp_rec_dbf_event_thread_lock("erasfx1", adapter);
650 down(&adapter->erp_ready_sem);
651 zfcp_rec_dbf_event_thread_lock("erasfx2", adapter);
652 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
655 if (!(atomic_read(&adapter->status) &
656 ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
663 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
666 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
667 return ZFCP_ERP_FAILED;
669 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
670 zfcp_erp_enqueue_ptp_port(adapter);
672 return ZFCP_ERP_SUCCEEDED;
675 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
678 struct zfcp_adapter *adapter = act->adapter;
680 write_lock_irq(&adapter->erp_lock);
681 zfcp_erp_action_to_running(act);
682 write_unlock_irq(&adapter->erp_lock);
684 ret = zfcp_fsf_exchange_port_data(act);
685 if (ret == -EOPNOTSUPP)
686 return ZFCP_ERP_SUCCEEDED;
688 return ZFCP_ERP_FAILED;
690 zfcp_rec_dbf_event_thread_lock("erasox1", adapter);
691 down(&adapter->erp_ready_sem);
692 zfcp_rec_dbf_event_thread_lock("erasox2", adapter);
693 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
694 return ZFCP_ERP_FAILED;
696 return ZFCP_ERP_SUCCEEDED;
699 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
701 if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
702 return ZFCP_ERP_FAILED;
704 if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
705 return ZFCP_ERP_FAILED;
707 atomic_set(&act->adapter->stat_miss, 16);
708 if (zfcp_status_read_refill(act->adapter))
709 return ZFCP_ERP_FAILED;
711 return ZFCP_ERP_SUCCEEDED;
714 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
716 struct zfcp_adapter *adapter = act->adapter;
718 /* close queues to ensure that buffers are not accessed by adapter */
719 zfcp_qdio_close(adapter);
720 zfcp_fsf_req_dismiss_all(adapter);
721 adapter->fsf_req_seq_no = 0;
722 zfcp_fc_wka_port_force_offline(&adapter->nsp);
723 /* all ports and units are closed */
724 zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
725 ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
727 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
728 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
731 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
733 struct zfcp_adapter *adapter = act->adapter;
735 if (zfcp_erp_adapter_strategy_open_qdio(act)) {
736 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
737 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
739 return ZFCP_ERP_FAILED;
742 if (zfcp_erp_adapter_strategy_open_fsf(act)) {
743 zfcp_erp_adapter_strategy_close(act);
744 return ZFCP_ERP_FAILED;
747 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
749 return ZFCP_ERP_SUCCEEDED;
752 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
754 struct zfcp_adapter *adapter = act->adapter;
756 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
757 zfcp_erp_adapter_strategy_close(act);
758 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
759 return ZFCP_ERP_EXIT;
762 if (zfcp_erp_adapter_strategy_open(act)) {
764 return ZFCP_ERP_FAILED;
767 return ZFCP_ERP_SUCCEEDED;
770 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
774 retval = zfcp_fsf_close_physical_port(act);
775 if (retval == -ENOMEM)
776 return ZFCP_ERP_NOMEM;
777 act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
779 return ZFCP_ERP_FAILED;
781 return ZFCP_ERP_CONTINUES;
784 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
786 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
789 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
791 struct zfcp_port *port = erp_action->port;
792 int status = atomic_read(&port->status);
794 switch (erp_action->step) {
795 case ZFCP_ERP_STEP_UNINITIALIZED:
796 zfcp_erp_port_strategy_clearstati(port);
797 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
798 (status & ZFCP_STATUS_COMMON_OPEN))
799 return zfcp_erp_port_forced_strategy_close(erp_action);
801 return ZFCP_ERP_FAILED;
803 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
804 if (status & ZFCP_STATUS_PORT_PHYS_OPEN)
805 return ZFCP_ERP_SUCCEEDED;
807 return ZFCP_ERP_FAILED;
810 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
814 retval = zfcp_fsf_close_port(erp_action);
815 if (retval == -ENOMEM)
816 return ZFCP_ERP_NOMEM;
817 erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
819 return ZFCP_ERP_FAILED;
820 return ZFCP_ERP_CONTINUES;
823 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
827 retval = zfcp_fsf_open_port(erp_action);
828 if (retval == -ENOMEM)
829 return ZFCP_ERP_NOMEM;
830 erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
832 return ZFCP_ERP_FAILED;
833 return ZFCP_ERP_CONTINUES;
836 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
838 struct zfcp_adapter *adapter = act->adapter;
839 struct zfcp_port *port = act->port;
841 if (port->wwpn != adapter->peer_wwpn) {
842 zfcp_erp_port_failed(port, "eroptp1", NULL);
843 return ZFCP_ERP_FAILED;
845 port->d_id = adapter->peer_d_id;
846 return zfcp_erp_port_strategy_open_port(act);
849 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
852 struct zfcp_port *port = container_of(work, struct zfcp_port,
855 retval = zfcp_fc_ns_gid_pn(&port->erp_action);
856 if (retval == -ENOMEM)
857 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_NOMEM);
858 port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
860 zfcp_erp_notify(&port->erp_action, ZFCP_ERP_FAILED);
864 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
866 struct zfcp_adapter *adapter = act->adapter;
867 struct zfcp_port *port = act->port;
868 int p_status = atomic_read(&port->status);
871 case ZFCP_ERP_STEP_UNINITIALIZED:
872 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
873 case ZFCP_ERP_STEP_PORT_CLOSING:
874 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
875 return zfcp_erp_open_ptp_port(act);
878 if (!queue_work(zfcp_data.work_queue,
881 return ZFCP_ERP_CONTINUES;
883 case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
885 return ZFCP_ERP_FAILED;
886 return zfcp_erp_port_strategy_open_port(act);
888 case ZFCP_ERP_STEP_PORT_OPENING:
889 /* D_ID might have changed during open */
890 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
892 return ZFCP_ERP_SUCCEEDED;
894 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
895 return ZFCP_ERP_CONTINUES;
897 /* fall through otherwise */
900 return ZFCP_ERP_FAILED;
903 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
905 struct zfcp_port *port = erp_action->port;
907 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
908 goto close_init_done;
910 switch (erp_action->step) {
911 case ZFCP_ERP_STEP_UNINITIALIZED:
912 zfcp_erp_port_strategy_clearstati(port);
913 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
914 return zfcp_erp_port_strategy_close(erp_action);
917 case ZFCP_ERP_STEP_PORT_CLOSING:
918 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
919 return ZFCP_ERP_FAILED;
924 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
925 return ZFCP_ERP_EXIT;
927 return zfcp_erp_port_strategy_open_common(erp_action);
930 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
932 atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
933 ZFCP_STATUS_UNIT_SHARED |
934 ZFCP_STATUS_UNIT_READONLY,
938 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
940 int retval = zfcp_fsf_close_unit(erp_action);
941 if (retval == -ENOMEM)
942 return ZFCP_ERP_NOMEM;
943 erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
945 return ZFCP_ERP_FAILED;
946 return ZFCP_ERP_CONTINUES;
949 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
951 int retval = zfcp_fsf_open_unit(erp_action);
952 if (retval == -ENOMEM)
953 return ZFCP_ERP_NOMEM;
954 erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
956 return ZFCP_ERP_FAILED;
957 return ZFCP_ERP_CONTINUES;
960 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
962 struct zfcp_unit *unit = erp_action->unit;
964 switch (erp_action->step) {
965 case ZFCP_ERP_STEP_UNINITIALIZED:
966 zfcp_erp_unit_strategy_clearstati(unit);
967 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
968 return zfcp_erp_unit_strategy_close(erp_action);
969 /* already closed, fall through */
970 case ZFCP_ERP_STEP_UNIT_CLOSING:
971 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
972 return ZFCP_ERP_FAILED;
973 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
974 return ZFCP_ERP_EXIT;
975 return zfcp_erp_unit_strategy_open(erp_action);
977 case ZFCP_ERP_STEP_UNIT_OPENING:
978 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
979 return ZFCP_ERP_SUCCEEDED;
981 return ZFCP_ERP_FAILED;
984 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
987 case ZFCP_ERP_SUCCEEDED :
988 atomic_set(&unit->erp_counter, 0);
989 zfcp_erp_unit_unblock(unit);
991 case ZFCP_ERP_FAILED :
992 atomic_inc(&unit->erp_counter);
993 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
994 dev_err(&unit->port->adapter->ccw_device->dev,
995 "ERP failed for unit 0x%016Lx on "
997 (unsigned long long)unit->fcp_lun,
998 (unsigned long long)unit->port->wwpn);
999 zfcp_erp_unit_failed(unit, "erusck1", NULL);
1004 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1005 zfcp_erp_unit_block(unit, 0);
1006 result = ZFCP_ERP_EXIT;
1011 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1014 case ZFCP_ERP_SUCCEEDED :
1015 atomic_set(&port->erp_counter, 0);
1016 zfcp_erp_port_unblock(port);
1019 case ZFCP_ERP_FAILED :
1020 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1021 zfcp_erp_port_block(port, 0);
1022 result = ZFCP_ERP_EXIT;
1024 atomic_inc(&port->erp_counter);
1025 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1026 dev_err(&port->adapter->ccw_device->dev,
1027 "ERP failed for remote port 0x%016Lx\n",
1028 (unsigned long long)port->wwpn);
1029 zfcp_erp_port_failed(port, "erpsck1", NULL);
1034 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1035 zfcp_erp_port_block(port, 0);
1036 result = ZFCP_ERP_EXIT;
1041 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1045 case ZFCP_ERP_SUCCEEDED :
1046 atomic_set(&adapter->erp_counter, 0);
1047 zfcp_erp_adapter_unblock(adapter);
1050 case ZFCP_ERP_FAILED :
1051 atomic_inc(&adapter->erp_counter);
1052 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1053 dev_err(&adapter->ccw_device->dev,
1054 "ERP cannot recover an error "
1055 "on the FCP device\n");
1056 zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1061 if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1062 zfcp_erp_adapter_block(adapter, 0);
1063 result = ZFCP_ERP_EXIT;
1068 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1071 struct zfcp_adapter *adapter = erp_action->adapter;
1072 struct zfcp_port *port = erp_action->port;
1073 struct zfcp_unit *unit = erp_action->unit;
1075 switch (erp_action->action) {
1077 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1078 result = zfcp_erp_strategy_check_unit(unit, result);
1081 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1082 case ZFCP_ERP_ACTION_REOPEN_PORT:
1083 result = zfcp_erp_strategy_check_port(port, result);
1086 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1087 result = zfcp_erp_strategy_check_adapter(adapter, result);
1093 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1095 int status = atomic_read(target_status);
1097 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1098 (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1099 return 1; /* take it online */
1101 if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1102 !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1103 return 1; /* take it offline */
1108 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1110 int action = act->action;
1111 struct zfcp_adapter *adapter = act->adapter;
1112 struct zfcp_port *port = act->port;
1113 struct zfcp_unit *unit = act->unit;
1114 u32 erp_status = act->status;
1117 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1118 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1119 _zfcp_erp_adapter_reopen(adapter,
1120 ZFCP_STATUS_COMMON_ERP_FAILED,
1122 return ZFCP_ERP_EXIT;
1126 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1127 case ZFCP_ERP_ACTION_REOPEN_PORT:
1128 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1129 _zfcp_erp_port_reopen(port,
1130 ZFCP_STATUS_COMMON_ERP_FAILED,
1132 return ZFCP_ERP_EXIT;
1136 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1137 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1138 _zfcp_erp_unit_reopen(unit,
1139 ZFCP_STATUS_COMMON_ERP_FAILED,
1141 return ZFCP_ERP_EXIT;
1148 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1150 struct zfcp_adapter *adapter = erp_action->adapter;
1152 adapter->erp_total_count--;
1153 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1154 adapter->erp_low_mem_count--;
1155 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1158 list_del(&erp_action->list);
1159 zfcp_rec_dbf_event_action("eractd1", erp_action);
1161 switch (erp_action->action) {
1162 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1163 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1164 &erp_action->unit->status);
1167 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1168 case ZFCP_ERP_ACTION_REOPEN_PORT:
1169 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1170 &erp_action->port->status);
1173 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1174 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1175 &erp_action->adapter->status);
1180 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1182 struct zfcp_adapter *adapter = act->adapter;
1183 struct zfcp_port *port = act->port;
1184 struct zfcp_unit *unit = act->unit;
1186 switch (act->action) {
1187 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1188 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1189 zfcp_unit_get(unit);
1190 if (scsi_queue_work(unit->port->adapter->scsi_host,
1191 &unit->scsi_work) <= 0)
1192 zfcp_unit_put(unit);
1194 zfcp_unit_put(unit);
1197 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1198 case ZFCP_ERP_ACTION_REOPEN_PORT:
1199 if (result == ZFCP_ERP_SUCCEEDED)
1200 zfcp_scsi_schedule_rport_register(port);
1201 zfcp_port_put(port);
1204 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1205 if (result == ZFCP_ERP_SUCCEEDED) {
1206 register_service_level(&adapter->service_level);
1207 schedule_work(&adapter->scan_work);
1209 unregister_service_level(&adapter->service_level);
1210 zfcp_adapter_put(adapter);
1215 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1217 switch (erp_action->action) {
1218 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1219 return zfcp_erp_adapter_strategy(erp_action);
1220 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1221 return zfcp_erp_port_forced_strategy(erp_action);
1222 case ZFCP_ERP_ACTION_REOPEN_PORT:
1223 return zfcp_erp_port_strategy(erp_action);
1224 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1225 return zfcp_erp_unit_strategy(erp_action);
1227 return ZFCP_ERP_FAILED;
1230 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1233 struct zfcp_adapter *adapter = erp_action->adapter;
1234 unsigned long flags;
1236 read_lock_irqsave(&zfcp_data.config_lock, flags);
1237 write_lock(&adapter->erp_lock);
1239 zfcp_erp_strategy_check_fsfreq(erp_action);
1241 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1242 zfcp_erp_action_dequeue(erp_action);
1243 retval = ZFCP_ERP_DISMISSED;
1247 zfcp_erp_action_to_running(erp_action);
1249 /* no lock to allow for blocking operations */
1250 write_unlock(&adapter->erp_lock);
1251 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1252 retval = zfcp_erp_strategy_do_action(erp_action);
1253 read_lock_irqsave(&zfcp_data.config_lock, flags);
1254 write_lock(&adapter->erp_lock);
1256 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1257 retval = ZFCP_ERP_CONTINUES;
1260 case ZFCP_ERP_NOMEM:
1261 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1262 ++adapter->erp_low_mem_count;
1263 erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1265 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1266 _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1268 zfcp_erp_strategy_memwait(erp_action);
1269 retval = ZFCP_ERP_CONTINUES;
1273 case ZFCP_ERP_CONTINUES:
1274 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1275 --adapter->erp_low_mem_count;
1276 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1281 retval = zfcp_erp_strategy_check_target(erp_action, retval);
1282 zfcp_erp_action_dequeue(erp_action);
1283 retval = zfcp_erp_strategy_statechange(erp_action, retval);
1284 if (retval == ZFCP_ERP_EXIT)
1286 zfcp_erp_strategy_followup_actions(erp_action);
1289 write_unlock(&adapter->erp_lock);
1290 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1292 if (retval != ZFCP_ERP_CONTINUES)
1293 zfcp_erp_action_cleanup(erp_action, retval);
1298 static int zfcp_erp_thread(void *data)
1300 struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1301 struct list_head *next;
1302 struct zfcp_erp_action *act;
1303 unsigned long flags;
1306 daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1307 /* Block all signals */
1308 siginitsetinv(¤t->blocked, 0);
1309 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1310 wake_up(&adapter->erp_thread_wqh);
1312 while (!(atomic_read(&adapter->status) &
1313 ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1315 zfcp_rec_dbf_event_thread_lock("erthrd1", adapter);
1316 ignore = down_interruptible(&adapter->erp_ready_sem);
1317 zfcp_rec_dbf_event_thread_lock("erthrd2", adapter);
1319 write_lock_irqsave(&adapter->erp_lock, flags);
1320 next = adapter->erp_ready_head.next;
1321 write_unlock_irqrestore(&adapter->erp_lock, flags);
1323 if (next != &adapter->erp_ready_head) {
1324 act = list_entry(next, struct zfcp_erp_action, list);
1326 /* there is more to come after dismission, no notify */
1327 if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1328 zfcp_erp_wakeup(adapter);
1332 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1333 wake_up(&adapter->erp_thread_wqh);
1339 * zfcp_erp_thread_setup - Start ERP thread for adapter
1340 * @adapter: Adapter to start the ERP thread for
1342 * Returns 0 on success or error code from kernel_thread()
1344 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1348 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1349 retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1351 dev_err(&adapter->ccw_device->dev,
1352 "Creating an ERP thread for the FCP device failed.\n");
1355 wait_event(adapter->erp_thread_wqh,
1356 atomic_read(&adapter->status) &
1357 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1362 * zfcp_erp_thread_kill - Stop ERP thread.
1363 * @adapter: Adapter where the ERP thread should be stopped.
1365 * The caller of this routine ensures that the specified adapter has
1366 * been shut down and that this operation has been completed. Thus,
1367 * there are no pending erp_actions which would need to be handled
1370 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1372 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1373 up(&adapter->erp_ready_sem);
1374 zfcp_rec_dbf_event_thread_lock("erthrk1", adapter);
1376 wait_event(adapter->erp_thread_wqh,
1377 !(atomic_read(&adapter->status) &
1378 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1380 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1385 * zfcp_erp_adapter_failed - Set adapter status to failed.
1386 * @adapter: Failed adapter.
1387 * @id: Event id for debug trace.
1388 * @ref: Reference for debug trace.
1390 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1392 zfcp_erp_modify_adapter_status(adapter, id, ref,
1393 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1397 * zfcp_erp_port_failed - Set port status to failed.
1398 * @port: Failed port.
1399 * @id: Event id for debug trace.
1400 * @ref: Reference for debug trace.
1402 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1404 zfcp_erp_modify_port_status(port, id, ref,
1405 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1409 * zfcp_erp_unit_failed - Set unit status to failed.
1410 * @unit: Failed unit.
1411 * @id: Event id for debug trace.
1412 * @ref: Reference for debug trace.
1414 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1416 zfcp_erp_modify_unit_status(unit, id, ref,
1417 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1421 * zfcp_erp_wait - wait for completion of error recovery on an adapter
1422 * @adapter: adapter for which to wait for completion of its error recovery
1424 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1426 wait_event(adapter->erp_done_wqh,
1427 !(atomic_read(&adapter->status) &
1428 ZFCP_STATUS_ADAPTER_ERP_PENDING));
1432 * zfcp_erp_modify_adapter_status - change adapter status bits
1433 * @adapter: adapter to change the status
1434 * @id: id for the debug trace
1435 * @ref: reference for the debug trace
1436 * @mask: status bits to change
1437 * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1439 * Changes in common status bits are propagated to attached ports and units.
1441 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1442 void *ref, u32 mask, int set_or_clear)
1444 struct zfcp_port *port;
1445 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1447 if (set_or_clear == ZFCP_SET) {
1448 if (status_change_set(mask, &adapter->status))
1449 zfcp_rec_dbf_event_adapter(id, ref, adapter);
1450 atomic_set_mask(mask, &adapter->status);
1452 if (status_change_clear(mask, &adapter->status))
1453 zfcp_rec_dbf_event_adapter(id, ref, adapter);
1454 atomic_clear_mask(mask, &adapter->status);
1455 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1456 atomic_set(&adapter->erp_counter, 0);
1460 list_for_each_entry(port, &adapter->port_list_head, list)
1461 zfcp_erp_modify_port_status(port, id, ref, common_mask,
1466 * zfcp_erp_modify_port_status - change port status bits
1467 * @port: port to change the status bits
1468 * @id: id for the debug trace
1469 * @ref: reference for the debug trace
1470 * @mask: status bits to change
1471 * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1473 * Changes in common status bits are propagated to attached units.
1475 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1476 u32 mask, int set_or_clear)
1478 struct zfcp_unit *unit;
1479 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1481 if (set_or_clear == ZFCP_SET) {
1482 if (status_change_set(mask, &port->status))
1483 zfcp_rec_dbf_event_port(id, ref, port);
1484 atomic_set_mask(mask, &port->status);
1486 if (status_change_clear(mask, &port->status))
1487 zfcp_rec_dbf_event_port(id, ref, port);
1488 atomic_clear_mask(mask, &port->status);
1489 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1490 atomic_set(&port->erp_counter, 0);
1494 list_for_each_entry(unit, &port->unit_list_head, list)
1495 zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1500 * zfcp_erp_modify_unit_status - change unit status bits
1501 * @unit: unit to change the status bits
1502 * @id: id for the debug trace
1503 * @ref: reference for the debug trace
1504 * @mask: status bits to change
1505 * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1507 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1508 u32 mask, int set_or_clear)
1510 if (set_or_clear == ZFCP_SET) {
1511 if (status_change_set(mask, &unit->status))
1512 zfcp_rec_dbf_event_unit(id, ref, unit);
1513 atomic_set_mask(mask, &unit->status);
1515 if (status_change_clear(mask, &unit->status))
1516 zfcp_rec_dbf_event_unit(id, ref, unit);
1517 atomic_clear_mask(mask, &unit->status);
1518 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1519 atomic_set(&unit->erp_counter, 0);
1525 * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1526 * @port: The "boxed" port.
1527 * @id: The debug trace id.
1528 * @id: Reference for the debug trace.
1530 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1532 unsigned long flags;
1534 read_lock_irqsave(&zfcp_data.config_lock, flags);
1535 zfcp_erp_modify_port_status(port, id, ref,
1536 ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1537 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1538 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1542 * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1543 * @port: The "boxed" unit.
1544 * @id: The debug trace id.
1545 * @id: Reference for the debug trace.
1547 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1549 zfcp_erp_modify_unit_status(unit, id, ref,
1550 ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1551 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1555 * zfcp_erp_port_access_denied - Adapter denied access to port.
1556 * @port: port where access has been denied
1557 * @id: id for debug trace
1558 * @ref: reference for debug trace
1560 * Since the adapter has denied access, stop using the port and the
1563 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1565 unsigned long flags;
1567 read_lock_irqsave(&zfcp_data.config_lock, flags);
1568 zfcp_erp_modify_port_status(port, id, ref,
1569 ZFCP_STATUS_COMMON_ERP_FAILED |
1570 ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1571 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1575 * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1576 * @unit: unit where access has been denied
1577 * @id: id for debug trace
1578 * @ref: reference for debug trace
1580 * Since the adapter has denied access, stop using the unit.
1582 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1584 zfcp_erp_modify_unit_status(unit, id, ref,
1585 ZFCP_STATUS_COMMON_ERP_FAILED |
1586 ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1589 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1592 int status = atomic_read(&unit->status);
1593 if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1594 ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1597 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1600 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1603 struct zfcp_unit *unit;
1604 int status = atomic_read(&port->status);
1606 if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1607 ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1608 list_for_each_entry(unit, &port->unit_list_head, list)
1609 zfcp_erp_unit_access_changed(unit, id, ref);
1613 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1617 * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1618 * @adapter: Adapter where the Access Control Table (ACT) changed
1619 * @id: Id for debug trace
1620 * @ref: Reference for debug trace
1622 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1625 struct zfcp_port *port;
1626 unsigned long flags;
1628 if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1631 read_lock_irqsave(&zfcp_data.config_lock, flags);
1632 list_for_each_entry(port, &adapter->port_list_head, list)
1633 zfcp_erp_port_access_changed(port, id, ref);
1634 read_unlock_irqrestore(&zfcp_data.config_lock, flags);