2 * This file is part of the zfcp device driver for
3 * FCP adapters for IBM System z9 and zSeries.
5 * (C) Copyright IBM Corp. 2002, 2006
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_ERP
26 static int zfcp_erp_adisc(struct zfcp_port *);
27 static void zfcp_erp_adisc_handler(unsigned long);
29 static int zfcp_erp_adapter_reopen_internal(struct zfcp_adapter *, int);
30 static int zfcp_erp_port_forced_reopen_internal(struct zfcp_port *, int);
31 static int zfcp_erp_port_reopen_internal(struct zfcp_port *, int);
32 static int zfcp_erp_unit_reopen_internal(struct zfcp_unit *, int);
34 static int zfcp_erp_port_reopen_all_internal(struct zfcp_adapter *, int);
35 static int zfcp_erp_unit_reopen_all_internal(struct zfcp_port *, int);
37 static void zfcp_erp_adapter_block(struct zfcp_adapter *, int);
38 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *);
39 static void zfcp_erp_port_block(struct zfcp_port *, int);
40 static void zfcp_erp_port_unblock(struct zfcp_port *);
41 static void zfcp_erp_unit_block(struct zfcp_unit *, int);
42 static void zfcp_erp_unit_unblock(struct zfcp_unit *);
44 static int zfcp_erp_thread(void *);
46 static int zfcp_erp_strategy(struct zfcp_erp_action *);
48 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *);
49 static int zfcp_erp_strategy_memwait(struct zfcp_erp_action *);
50 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *, int);
51 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *, int);
52 static int zfcp_erp_strategy_check_port(struct zfcp_port *, int);
53 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *, int);
54 static int zfcp_erp_strategy_statechange(int, u32, struct zfcp_adapter *,
56 struct zfcp_unit *, int);
57 static int zfcp_erp_strategy_statechange_detected(atomic_t *, u32);
58 static int zfcp_erp_strategy_followup_actions(int, struct zfcp_adapter *,
60 struct zfcp_unit *, int);
61 static int zfcp_erp_strategy_check_queues(struct zfcp_adapter *);
62 static int zfcp_erp_strategy_check_action(struct zfcp_erp_action *, int);
64 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *);
65 static int zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *, int);
66 static int zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *);
67 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *);
68 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *);
69 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *);
70 static int zfcp_erp_adapter_strategy_open_fsf_xconfig(struct zfcp_erp_action *);
71 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *);
72 static int zfcp_erp_adapter_strategy_open_fsf_statusread(
73 struct zfcp_erp_action *);
75 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *);
76 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *);
78 static int zfcp_erp_port_strategy(struct zfcp_erp_action *);
79 static int zfcp_erp_port_strategy_clearstati(struct zfcp_port *);
80 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *);
81 static int zfcp_erp_port_strategy_open(struct zfcp_erp_action *);
82 static int zfcp_erp_port_strategy_open_nameserver(struct zfcp_erp_action *);
83 static int zfcp_erp_port_strategy_open_nameserver_wakeup(
84 struct zfcp_erp_action *);
85 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *);
86 static int zfcp_erp_port_strategy_open_common_lookup(struct zfcp_erp_action *);
87 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *);
89 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *);
90 static int zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *);
91 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *);
92 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *);
94 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *);
95 static void zfcp_erp_action_dismiss_port(struct zfcp_port *);
96 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *);
97 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *);
99 static int zfcp_erp_action_enqueue(int, struct zfcp_adapter *,
100 struct zfcp_port *, struct zfcp_unit *);
101 static int zfcp_erp_action_dequeue(struct zfcp_erp_action *);
102 static void zfcp_erp_action_cleanup(int, struct zfcp_adapter *,
103 struct zfcp_port *, struct zfcp_unit *,
106 static void zfcp_erp_action_ready(struct zfcp_erp_action *);
107 static int zfcp_erp_action_exists(struct zfcp_erp_action *);
109 static void zfcp_erp_action_to_ready(struct zfcp_erp_action *);
110 static void zfcp_erp_action_to_running(struct zfcp_erp_action *);
112 static void zfcp_erp_memwait_handler(unsigned long);
115 * zfcp_close_qdio - close qdio queues for an adapter
117 static void zfcp_close_qdio(struct zfcp_adapter *adapter)
119 struct zfcp_qdio_queue *req_queue;
122 if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status))
125 /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
126 req_queue = &adapter->request_queue;
127 write_lock_irq(&req_queue->queue_lock);
128 atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
129 write_unlock_irq(&req_queue->queue_lock);
131 debug_text_event(adapter->erp_dbf, 3, "qdio_down2a");
132 while (qdio_shutdown(adapter->ccw_device,
133 QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS)
135 debug_text_event(adapter->erp_dbf, 3, "qdio_down2b");
137 /* cleanup used outbound sbals */
138 count = atomic_read(&req_queue->free_count);
139 if (count < QDIO_MAX_BUFFERS_PER_Q) {
140 first = (req_queue->free_index+count) % QDIO_MAX_BUFFERS_PER_Q;
141 count = QDIO_MAX_BUFFERS_PER_Q - count;
142 zfcp_qdio_zero_sbals(req_queue->buffer, first, count);
144 req_queue->free_index = 0;
145 atomic_set(&req_queue->free_count, 0);
146 req_queue->distance_from_int = 0;
147 adapter->response_queue.free_index = 0;
148 atomic_set(&adapter->response_queue.free_count, 0);
152 * zfcp_close_fsf - stop FSF operations for an adapter
154 * Dismiss and cleanup all pending fsf_reqs (this wakes up all initiators of
155 * requests waiting for completion; especially this returns SCSI commands
158 static void zfcp_close_fsf(struct zfcp_adapter *adapter)
160 /* close queues to ensure that buffers are not accessed by adapter */
161 zfcp_close_qdio(adapter);
162 zfcp_fsf_req_dismiss_all(adapter);
163 /* reset FSF request sequence number */
164 adapter->fsf_req_seq_no = 0;
165 /* all ports and units are closed */
166 zfcp_erp_modify_adapter_status(adapter,
167 ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
171 * zfcp_fsf_request_timeout_handler - called if a request timed out
172 * @data: pointer to adapter for handler function
174 * This function needs to be called if requests (ELS, Generic Service,
175 * or SCSI commands) exceed a certain time limit. The assumption is
176 * that after the time limit the adapter get stuck. So we trigger a reopen of
179 static void zfcp_fsf_request_timeout_handler(unsigned long data)
181 struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
182 zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
185 void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req, unsigned long timeout)
187 fsf_req->timer.function = zfcp_fsf_request_timeout_handler;
188 fsf_req->timer.data = (unsigned long) fsf_req->adapter;
189 fsf_req->timer.expires = jiffies + timeout;
190 add_timer(&fsf_req->timer);
196 * purpose: called if an adapter failed,
197 * initiates adapter recovery which is done
200 * returns: 0 - initiated action successfully
201 * <0 - failed to initiate action
204 zfcp_erp_adapter_reopen_internal(struct zfcp_adapter *adapter, int clear_mask)
208 debug_text_event(adapter->erp_dbf, 5, "a_ro");
209 ZFCP_LOG_DEBUG("reopen adapter %s\n",
210 zfcp_get_busid_by_adapter(adapter));
212 zfcp_erp_adapter_block(adapter, clear_mask);
214 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) {
215 ZFCP_LOG_DEBUG("skipped reopen of failed adapter %s\n",
216 zfcp_get_busid_by_adapter(adapter));
217 debug_text_event(adapter->erp_dbf, 5, "a_ro_f");
218 /* ensure propagation of failed status to new devices */
219 zfcp_erp_adapter_failed(adapter);
223 retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
224 adapter, NULL, NULL);
233 * purpose: Wrappper for zfcp_erp_adapter_reopen_internal
234 * used to ensure the correct locking
236 * returns: 0 - initiated action successfully
237 * <0 - failed to initiate action
240 zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear_mask)
245 read_lock_irqsave(&zfcp_data.config_lock, flags);
246 write_lock(&adapter->erp_lock);
247 retval = zfcp_erp_adapter_reopen_internal(adapter, clear_mask);
248 write_unlock(&adapter->erp_lock);
249 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
255 zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear_mask)
259 retval = zfcp_erp_adapter_reopen(adapter,
260 ZFCP_STATUS_COMMON_RUNNING |
261 ZFCP_STATUS_COMMON_ERP_FAILED |
268 zfcp_erp_port_shutdown(struct zfcp_port *port, int clear_mask)
272 retval = zfcp_erp_port_reopen(port,
273 ZFCP_STATUS_COMMON_RUNNING |
274 ZFCP_STATUS_COMMON_ERP_FAILED |
281 zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear_mask)
285 retval = zfcp_erp_unit_reopen(unit,
286 ZFCP_STATUS_COMMON_RUNNING |
287 ZFCP_STATUS_COMMON_ERP_FAILED |
295 * zfcp_erp_adisc - send ADISC ELS command
296 * @port: port structure
299 zfcp_erp_adisc(struct zfcp_port *port)
301 struct zfcp_adapter *adapter = port->adapter;
302 struct zfcp_send_els *send_els;
303 struct zfcp_ls_adisc *adisc;
304 void *address = NULL;
307 send_els = kzalloc(sizeof(struct zfcp_send_els), GFP_ATOMIC);
308 if (send_els == NULL)
311 send_els->req = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC);
312 if (send_els->req == NULL)
314 sg_init_table(send_els->req, 1);
316 send_els->resp = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC);
317 if (send_els->resp == NULL)
319 sg_init_table(send_els->resp, 1);
321 address = (void *) get_zeroed_page(GFP_ATOMIC);
325 zfcp_address_to_sg(address, send_els->req, sizeof(struct zfcp_ls_adisc));
326 address += PAGE_SIZE >> 1;
327 zfcp_address_to_sg(address, send_els->resp, sizeof(struct zfcp_ls_adisc_acc));
328 send_els->req_count = send_els->resp_count = 1;
330 send_els->adapter = adapter;
331 send_els->port = port;
332 send_els->d_id = port->d_id;
333 send_els->handler = zfcp_erp_adisc_handler;
334 send_els->handler_data = (unsigned long) send_els;
336 adisc = zfcp_sg_to_address(send_els->req);
337 send_els->ls_code = adisc->code = ZFCP_LS_ADISC;
339 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
340 without FC-AL-2 capability, so we don't set it */
341 adisc->wwpn = fc_host_port_name(adapter->scsi_host);
342 adisc->wwnn = fc_host_node_name(adapter->scsi_host);
343 adisc->nport_id = fc_host_port_id(adapter->scsi_host);
344 ZFCP_LOG_INFO("ADISC request from s_id 0x%06x to d_id 0x%06x "
345 "(wwpn=0x%016Lx, wwnn=0x%016Lx, "
346 "hard_nport_id=0x%06x, nport_id=0x%06x)\n",
347 adisc->nport_id, send_els->d_id, (wwn_t) adisc->wwpn,
348 (wwn_t) adisc->wwnn, adisc->hard_nport_id,
351 retval = zfcp_fsf_send_els(send_els);
353 ZFCP_LOG_NORMAL("error: initiation of Send ELS failed for port "
354 "0x%06x on adapter %s\n", send_els->d_id,
355 zfcp_get_busid_by_adapter(adapter));
365 __free_pages(sg_page(send_els->req), 0);
366 if (send_els != NULL) {
367 kfree(send_els->req);
368 kfree(send_els->resp);
377 * zfcp_erp_adisc_handler - handler for ADISC ELS command
378 * @data: pointer to struct zfcp_send_els
380 * If ADISC failed (LS_RJT or timed out) forced reopen of the port is triggered.
383 zfcp_erp_adisc_handler(unsigned long data)
385 struct zfcp_send_els *send_els;
386 struct zfcp_port *port;
387 struct zfcp_adapter *adapter;
389 struct zfcp_ls_adisc_acc *adisc;
391 send_els = (struct zfcp_send_els *) data;
392 adapter = send_els->adapter;
393 port = send_els->port;
394 d_id = send_els->d_id;
396 /* request rejected or timed out */
397 if (send_els->status != 0) {
398 ZFCP_LOG_NORMAL("ELS request rejected/timed out, "
399 "force physical port reopen "
400 "(adapter %s, port d_id=0x%06x)\n",
401 zfcp_get_busid_by_adapter(adapter), d_id);
402 debug_text_event(adapter->erp_dbf, 3, "forcreop");
403 if (zfcp_erp_port_forced_reopen(port, 0))
404 ZFCP_LOG_NORMAL("failed reopen of port "
405 "(adapter %s, wwpn=0x%016Lx)\n",
406 zfcp_get_busid_by_port(port),
411 adisc = zfcp_sg_to_address(send_els->resp);
413 ZFCP_LOG_INFO("ADISC response from d_id 0x%06x to s_id "
414 "0x%06x (wwpn=0x%016Lx, wwnn=0x%016Lx, "
415 "hard_nport_id=0x%06x, nport_id=0x%06x)\n",
416 d_id, fc_host_port_id(adapter->scsi_host),
417 (wwn_t) adisc->wwpn, (wwn_t) adisc->wwnn,
418 adisc->hard_nport_id, adisc->nport_id);
420 /* set wwnn for port */
422 port->wwnn = adisc->wwnn;
424 if (port->wwpn != adisc->wwpn) {
425 ZFCP_LOG_NORMAL("d_id assignment changed, reopening "
426 "port (adapter %s, wwpn=0x%016Lx, "
427 "adisc_resp_wwpn=0x%016Lx)\n",
428 zfcp_get_busid_by_port(port),
429 port->wwpn, (wwn_t) adisc->wwpn);
430 if (zfcp_erp_port_reopen(port, 0))
431 ZFCP_LOG_NORMAL("failed reopen of port "
432 "(adapter %s, wwpn=0x%016Lx)\n",
433 zfcp_get_busid_by_port(port),
439 __free_pages(sg_page(send_els->req), 0);
440 kfree(send_els->req);
441 kfree(send_els->resp);
447 * zfcp_test_link - lightweight link test procedure
448 * @port: port to be tested
450 * Test status of a link to a remote port using the ELS command ADISC.
453 zfcp_test_link(struct zfcp_port *port)
458 retval = zfcp_erp_adisc(port);
461 ZFCP_LOG_NORMAL("reopen needed for port 0x%016Lx "
462 "on adapter %s\n ", port->wwpn,
463 zfcp_get_busid_by_port(port));
464 retval = zfcp_erp_port_forced_reopen(port, 0);
466 ZFCP_LOG_NORMAL("reopen of remote port 0x%016Lx "
467 "on adapter %s failed\n", port->wwpn,
468 zfcp_get_busid_by_port(port));
480 * purpose: called if a port failed to be opened normally
481 * initiates Forced Reopen recovery which is done
484 * returns: 0 - initiated action successfully
485 * <0 - failed to initiate action
488 zfcp_erp_port_forced_reopen_internal(struct zfcp_port *port, int clear_mask)
491 struct zfcp_adapter *adapter = port->adapter;
493 debug_text_event(adapter->erp_dbf, 5, "pf_ro");
494 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
496 ZFCP_LOG_DEBUG("forced reopen of port 0x%016Lx on adapter %s\n",
497 port->wwpn, zfcp_get_busid_by_port(port));
499 zfcp_erp_port_block(port, clear_mask);
501 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
502 ZFCP_LOG_DEBUG("skipped forced reopen of failed port 0x%016Lx "
503 "on adapter %s\n", port->wwpn,
504 zfcp_get_busid_by_port(port));
505 debug_text_event(adapter->erp_dbf, 5, "pf_ro_f");
506 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
511 retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
512 port->adapter, port, NULL);
521 * purpose: Wrappper for zfcp_erp_port_forced_reopen_internal
522 * used to ensure the correct locking
524 * returns: 0 - initiated action successfully
525 * <0 - failed to initiate action
528 zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear_mask)
532 struct zfcp_adapter *adapter;
534 adapter = port->adapter;
535 read_lock_irqsave(&zfcp_data.config_lock, flags);
536 write_lock(&adapter->erp_lock);
537 retval = zfcp_erp_port_forced_reopen_internal(port, clear_mask);
538 write_unlock(&adapter->erp_lock);
539 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
547 * purpose: called if a port is to be opened
548 * initiates Reopen recovery which is done
551 * returns: 0 - initiated action successfully
552 * <0 - failed to initiate action
555 zfcp_erp_port_reopen_internal(struct zfcp_port *port, int clear_mask)
558 struct zfcp_adapter *adapter = port->adapter;
560 debug_text_event(adapter->erp_dbf, 5, "p_ro");
561 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
563 ZFCP_LOG_DEBUG("reopen of port 0x%016Lx on adapter %s\n",
564 port->wwpn, zfcp_get_busid_by_port(port));
566 zfcp_erp_port_block(port, clear_mask);
568 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
569 ZFCP_LOG_DEBUG("skipped reopen of failed port 0x%016Lx "
570 "on adapter %s\n", port->wwpn,
571 zfcp_get_busid_by_port(port));
572 debug_text_event(adapter->erp_dbf, 5, "p_ro_f");
573 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
574 /* ensure propagation of failed status to new devices */
575 zfcp_erp_port_failed(port);
580 retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
581 port->adapter, port, NULL);
588 * zfcp_erp_port_reopen - initiate reopen of a remote port
589 * @port: port to be reopened
590 * @clear_mask: specifies flags in port status to be cleared
591 * Return: 0 on success, < 0 on error
593 * This is a wrappper function for zfcp_erp_port_reopen_internal. It ensures
594 * correct locking. An error recovery task is initiated to do the reopen.
595 * To wait for the completion of the reopen zfcp_erp_wait should be used.
598 zfcp_erp_port_reopen(struct zfcp_port *port, int clear_mask)
602 struct zfcp_adapter *adapter = port->adapter;
604 read_lock_irqsave(&zfcp_data.config_lock, flags);
605 write_lock(&adapter->erp_lock);
606 retval = zfcp_erp_port_reopen_internal(port, clear_mask);
607 write_unlock(&adapter->erp_lock);
608 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
616 * purpose: called if a unit is to be opened
617 * initiates Reopen recovery which is done
620 * returns: 0 - initiated action successfully
621 * <0 - failed to initiate action
624 zfcp_erp_unit_reopen_internal(struct zfcp_unit *unit, int clear_mask)
627 struct zfcp_adapter *adapter = unit->port->adapter;
629 debug_text_event(adapter->erp_dbf, 5, "u_ro");
630 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t));
631 ZFCP_LOG_DEBUG("reopen of unit 0x%016Lx on port 0x%016Lx "
632 "on adapter %s\n", unit->fcp_lun,
633 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
635 zfcp_erp_unit_block(unit, clear_mask);
637 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status)) {
638 ZFCP_LOG_DEBUG("skipped reopen of failed unit 0x%016Lx "
639 "on port 0x%016Lx on adapter %s\n",
640 unit->fcp_lun, unit->port->wwpn,
641 zfcp_get_busid_by_unit(unit));
642 debug_text_event(adapter->erp_dbf, 5, "u_ro_f");
643 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
649 retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
650 unit->port->adapter, unit->port, unit);
656 * zfcp_erp_unit_reopen - initiate reopen of a unit
657 * @unit: unit to be reopened
658 * @clear_mask: specifies flags in unit status to be cleared
659 * Return: 0 on success, < 0 on error
661 * This is a wrappper for zfcp_erp_unit_reopen_internal. It ensures correct
662 * locking. An error recovery task is initiated to do the reopen.
663 * To wait for the completion of the reopen zfcp_erp_wait should be used.
666 zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear_mask)
670 struct zfcp_adapter *adapter;
671 struct zfcp_port *port;
674 adapter = port->adapter;
676 read_lock_irqsave(&zfcp_data.config_lock, flags);
677 write_lock(&adapter->erp_lock);
678 retval = zfcp_erp_unit_reopen_internal(unit, clear_mask);
679 write_unlock(&adapter->erp_lock);
680 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
686 * zfcp_erp_adapter_block - mark adapter as blocked, block scsi requests
688 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int clear_mask)
690 debug_text_event(adapter->erp_dbf, 6, "a_bl");
691 zfcp_erp_modify_adapter_status(adapter,
692 ZFCP_STATUS_COMMON_UNBLOCKED |
693 clear_mask, ZFCP_CLEAR);
697 * zfcp_erp_adapter_unblock - mark adapter as unblocked, allow scsi requests
699 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
701 debug_text_event(adapter->erp_dbf, 6, "a_ubl");
702 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
708 * purpose: disable I/O,
709 * return any open requests and clean them up,
710 * aim: no pending and incoming I/O
715 zfcp_erp_port_block(struct zfcp_port *port, int clear_mask)
717 struct zfcp_adapter *adapter = port->adapter;
719 debug_text_event(adapter->erp_dbf, 6, "p_bl");
720 debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
721 zfcp_erp_modify_port_status(port,
722 ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
729 * purpose: enable I/O
734 zfcp_erp_port_unblock(struct zfcp_port *port)
736 struct zfcp_adapter *adapter = port->adapter;
738 debug_text_event(adapter->erp_dbf, 6, "p_ubl");
739 debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
740 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
746 * purpose: disable I/O,
747 * return any open requests and clean them up,
748 * aim: no pending and incoming I/O
753 zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
755 struct zfcp_adapter *adapter = unit->port->adapter;
757 debug_text_event(adapter->erp_dbf, 6, "u_bl");
758 debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
759 zfcp_erp_modify_unit_status(unit,
760 ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
767 * purpose: enable I/O
772 zfcp_erp_unit_unblock(struct zfcp_unit *unit)
774 struct zfcp_adapter *adapter = unit->port->adapter;
776 debug_text_event(adapter->erp_dbf, 6, "u_ubl");
777 debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
778 atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
782 zfcp_erp_action_ready(struct zfcp_erp_action *erp_action)
784 struct zfcp_adapter *adapter = erp_action->adapter;
786 debug_text_event(adapter->erp_dbf, 4, "a_ar");
787 debug_event(adapter->erp_dbf, 4, &erp_action->action, sizeof (int));
789 zfcp_erp_action_to_ready(erp_action);
790 up(&adapter->erp_ready_sem);
798 * returns: <0 erp_action not found in any list
799 * ZFCP_ERP_ACTION_READY erp_action is in ready list
800 * ZFCP_ERP_ACTION_RUNNING erp_action is in running list
802 * locks: erp_lock must be held
805 zfcp_erp_action_exists(struct zfcp_erp_action *erp_action)
807 int retval = -EINVAL;
808 struct list_head *entry;
809 struct zfcp_erp_action *entry_erp_action;
810 struct zfcp_adapter *adapter = erp_action->adapter;
812 /* search in running list */
813 list_for_each(entry, &adapter->erp_running_head) {
815 list_entry(entry, struct zfcp_erp_action, list);
816 if (entry_erp_action == erp_action) {
817 retval = ZFCP_ERP_ACTION_RUNNING;
821 /* search in ready list */
822 list_for_each(entry, &adapter->erp_ready_head) {
824 list_entry(entry, struct zfcp_erp_action, list);
825 if (entry_erp_action == erp_action) {
826 retval = ZFCP_ERP_ACTION_READY;
836 * purpose: checks current status of action (timed out, dismissed, ...)
837 * and does appropriate preparations (dismiss fsf request, ...)
839 * locks: called under erp_lock (disabled interrupts)
842 zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *erp_action)
844 struct zfcp_adapter *adapter = erp_action->adapter;
846 if (erp_action->fsf_req) {
847 /* take lock to ensure that request is not deleted meanwhile */
848 spin_lock(&adapter->req_list_lock);
849 if (zfcp_reqlist_find(adapter, erp_action->fsf_req->req_id)) {
850 /* fsf_req still exists */
851 debug_text_event(adapter->erp_dbf, 3, "a_ca_req");
852 debug_event(adapter->erp_dbf, 3, &erp_action->fsf_req,
853 sizeof (unsigned long));
854 /* dismiss fsf_req of timed out/dismissed erp_action */
855 if (erp_action->status & (ZFCP_STATUS_ERP_DISMISSED |
856 ZFCP_STATUS_ERP_TIMEDOUT)) {
857 debug_text_event(adapter->erp_dbf, 3,
859 erp_action->fsf_req->status |=
860 ZFCP_STATUS_FSFREQ_DISMISSED;
862 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
863 ZFCP_LOG_NORMAL("error: erp step timed out "
864 "(action=%d, fsf_req=%p)\n ",
866 erp_action->fsf_req);
869 * If fsf_req is neither dismissed nor completed
870 * then keep it running asynchronously and don't mess
871 * with the association of erp_action and fsf_req.
873 if (erp_action->fsf_req->status &
874 (ZFCP_STATUS_FSFREQ_COMPLETED |
875 ZFCP_STATUS_FSFREQ_DISMISSED)) {
876 /* forget about association between fsf_req
878 erp_action->fsf_req = NULL;
881 debug_text_event(adapter->erp_dbf, 3, "a_ca_gonereq");
883 * even if this fsf_req has gone, forget about
884 * association between erp_action and fsf_req
886 erp_action->fsf_req = NULL;
888 spin_unlock(&adapter->req_list_lock);
890 debug_text_event(adapter->erp_dbf, 3, "a_ca_noreq");
894 * zfcp_erp_async_handler_nolock - complete erp_action
896 * Used for normal completion, time-out, dismissal and failure after
897 * low memory condition.
899 static void zfcp_erp_async_handler_nolock(struct zfcp_erp_action *erp_action,
900 unsigned long set_mask)
902 struct zfcp_adapter *adapter = erp_action->adapter;
904 if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
905 debug_text_event(adapter->erp_dbf, 2, "a_asyh_ex");
906 debug_event(adapter->erp_dbf, 2, &erp_action->action,
908 erp_action->status |= set_mask;
909 zfcp_erp_action_ready(erp_action);
911 /* action is ready or gone - nothing to do */
912 debug_text_event(adapter->erp_dbf, 3, "a_asyh_gone");
913 debug_event(adapter->erp_dbf, 3, &erp_action->action,
919 * zfcp_erp_async_handler - wrapper for erp_async_handler_nolock w/ locking
921 void zfcp_erp_async_handler(struct zfcp_erp_action *erp_action,
922 unsigned long set_mask)
924 struct zfcp_adapter *adapter = erp_action->adapter;
927 write_lock_irqsave(&adapter->erp_lock, flags);
928 zfcp_erp_async_handler_nolock(erp_action, set_mask);
929 write_unlock_irqrestore(&adapter->erp_lock, flags);
933 * purpose: is called for erp_action which was slept waiting for
934 * memory becoming avaliable,
935 * will trigger that this action will be continued
938 zfcp_erp_memwait_handler(unsigned long data)
940 struct zfcp_erp_action *erp_action = (struct zfcp_erp_action *) data;
941 struct zfcp_adapter *adapter = erp_action->adapter;
943 debug_text_event(adapter->erp_dbf, 2, "a_mwh");
944 debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int));
946 zfcp_erp_async_handler(erp_action, 0);
950 * purpose: is called if an asynchronous erp step timed out,
951 * action gets an appropriate flag and will be processed
954 static void zfcp_erp_timeout_handler(unsigned long data)
956 struct zfcp_erp_action *erp_action = (struct zfcp_erp_action *) data;
957 struct zfcp_adapter *adapter = erp_action->adapter;
959 debug_text_event(adapter->erp_dbf, 2, "a_th");
960 debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int));
962 zfcp_erp_async_handler(erp_action, ZFCP_STATUS_ERP_TIMEDOUT);
966 * zfcp_erp_action_dismiss - dismiss an erp_action
968 * adapter->erp_lock must be held
970 * Dismissal of an erp_action is usually required if an erp_action of
971 * higher priority is generated.
973 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *erp_action)
975 struct zfcp_adapter *adapter = erp_action->adapter;
977 debug_text_event(adapter->erp_dbf, 2, "a_adis");
978 debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int));
980 erp_action->status |= ZFCP_STATUS_ERP_DISMISSED;
981 if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING)
982 zfcp_erp_action_ready(erp_action);
986 zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
990 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
992 retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
994 ZFCP_LOG_NORMAL("error: creation of erp thread failed for "
996 zfcp_get_busid_by_adapter(adapter));
997 debug_text_event(adapter->erp_dbf, 5, "a_thset_fail");
999 wait_event(adapter->erp_thread_wqh,
1000 atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
1002 debug_text_event(adapter->erp_dbf, 5, "a_thset_ok");
1005 return (retval < 0);
1015 * context: process (i.e. proc-fs or rmmod/insmod)
1017 * note: The caller of this routine ensures that the specified
1018 * adapter has been shut down and that this operation
1019 * has been completed. Thus, there are no pending erp_actions
1020 * which would need to be handled here.
1023 zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1027 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1028 up(&adapter->erp_ready_sem);
1030 wait_event(adapter->erp_thread_wqh,
1031 !atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
1034 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1037 debug_text_event(adapter->erp_dbf, 5, "a_thki_ok");
1043 * purpose: is run as a kernel thread,
1044 * goes through list of error recovery actions of associated adapter
1045 * and delegates single action to execution
1050 zfcp_erp_thread(void *data)
1052 struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1053 struct list_head *next;
1054 struct zfcp_erp_action *erp_action;
1055 unsigned long flags;
1057 daemonize("zfcperp%s", zfcp_get_busid_by_adapter(adapter));
1058 /* Block all signals */
1059 siginitsetinv(¤t->blocked, 0);
1060 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1061 debug_text_event(adapter->erp_dbf, 5, "a_th_run");
1062 wake_up(&adapter->erp_thread_wqh);
1064 while (!atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1065 &adapter->status)) {
1067 write_lock_irqsave(&adapter->erp_lock, flags);
1068 next = adapter->erp_ready_head.prev;
1069 write_unlock_irqrestore(&adapter->erp_lock, flags);
1071 if (next != &adapter->erp_ready_head) {
1073 list_entry(next, struct zfcp_erp_action, list);
1075 * process action (incl. [re]moving it
1076 * from 'ready' queue)
1078 zfcp_erp_strategy(erp_action);
1082 * sleep as long as there is nothing to do, i.e.
1083 * no action in 'ready' queue to be processed and
1084 * thread is not to be killed
1086 down_interruptible(&adapter->erp_ready_sem);
1087 debug_text_event(adapter->erp_dbf, 5, "a_th_woken");
1090 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1091 debug_text_event(adapter->erp_dbf, 5, "a_th_stop");
1092 wake_up(&adapter->erp_thread_wqh);
1100 * purpose: drives single error recovery action and schedules higher and
1101 * subordinate actions, if necessary
1103 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
1104 * ZFCP_ERP_SUCCEEDED - action finished successfully (deqd)
1105 * ZFCP_ERP_FAILED - action finished unsuccessfully (deqd)
1106 * ZFCP_ERP_EXIT - action finished (dequeued), offline
1107 * ZFCP_ERP_DISMISSED - action canceled (dequeued)
1110 zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1113 struct zfcp_adapter *adapter = erp_action->adapter;
1114 struct zfcp_port *port = erp_action->port;
1115 struct zfcp_unit *unit = erp_action->unit;
1116 int action = erp_action->action;
1117 u32 status = erp_action->status;
1118 unsigned long flags;
1120 /* serialise dismissing, timing out, moving, enqueueing */
1121 read_lock_irqsave(&zfcp_data.config_lock, flags);
1122 write_lock(&adapter->erp_lock);
1124 /* dequeue dismissed action and leave, if required */
1125 retval = zfcp_erp_strategy_check_action(erp_action, retval);
1126 if (retval == ZFCP_ERP_DISMISSED) {
1127 debug_text_event(adapter->erp_dbf, 4, "a_st_dis1");
1132 * move action to 'running' queue before processing it
1133 * (to avoid a race condition regarding moving the
1134 * action to the 'running' queue and back)
1136 zfcp_erp_action_to_running(erp_action);
1139 * try to process action as far as possible,
1140 * no lock to allow for blocking operations (kmalloc, qdio, ...),
1141 * afterwards the lock is required again for the following reasons:
1142 * - dequeueing of finished action and enqueueing of
1143 * follow-up actions must be atomic so that any other
1144 * reopen-routine does not believe there is nothing to do
1145 * and that it is safe to enqueue something else,
1146 * - we want to force any control thread which is dismissing
1147 * actions to finish this before we decide about
1148 * necessary steps to be taken here further
1150 write_unlock(&adapter->erp_lock);
1151 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1152 retval = zfcp_erp_strategy_do_action(erp_action);
1153 read_lock_irqsave(&zfcp_data.config_lock, flags);
1154 write_lock(&adapter->erp_lock);
1157 * check for dismissed status again to avoid follow-up actions,
1158 * failing of targets and so on for dismissed actions
1160 retval = zfcp_erp_strategy_check_action(erp_action, retval);
1163 case ZFCP_ERP_DISMISSED:
1164 /* leave since this action has ridden to its ancestors */
1165 debug_text_event(adapter->erp_dbf, 6, "a_st_dis2");
1167 case ZFCP_ERP_NOMEM:
1168 /* no memory to continue immediately, let it sleep */
1169 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1170 ++adapter->erp_low_mem_count;
1171 erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1173 /* This condition is true if there is no memory available
1174 for any erp_action on this adapter. This implies that there
1175 are no elements in the memory pool(s) left for erp_actions.
1176 This might happen if an erp_action that used a memory pool
1177 element was timed out.
1179 if (adapter->erp_total_count == adapter->erp_low_mem_count) {
1180 debug_text_event(adapter->erp_dbf, 3, "a_st_lowmem");
1181 ZFCP_LOG_NORMAL("error: no mempool elements available, "
1182 "restarting I/O on adapter %s "
1183 "to free mempool\n",
1184 zfcp_get_busid_by_adapter(adapter));
1185 zfcp_erp_adapter_reopen_internal(adapter, 0);
1187 debug_text_event(adapter->erp_dbf, 2, "a_st_memw");
1188 retval = zfcp_erp_strategy_memwait(erp_action);
1191 case ZFCP_ERP_CONTINUES:
1192 /* leave since this action runs asynchronously */
1193 debug_text_event(adapter->erp_dbf, 6, "a_st_cont");
1194 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1195 --adapter->erp_low_mem_count;
1196 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1200 /* ok, finished action (whatever its result is) */
1202 /* check for unrecoverable targets */
1203 retval = zfcp_erp_strategy_check_target(erp_action, retval);
1205 /* action must be dequeued (here to allow for further ones) */
1206 zfcp_erp_action_dequeue(erp_action);
1209 * put this target through the erp mill again if someone has
1210 * requested to change the status of a target being online
1211 * to offline or the other way around
1212 * (old retval is preserved if nothing has to be done here)
1214 retval = zfcp_erp_strategy_statechange(action, status, adapter,
1215 port, unit, retval);
1218 * leave if target is in permanent error state or if
1219 * action is repeated in order to process state change
1221 if (retval == ZFCP_ERP_EXIT) {
1222 debug_text_event(adapter->erp_dbf, 2, "a_st_exit");
1226 /* trigger follow up actions */
1227 zfcp_erp_strategy_followup_actions(action, adapter, port, unit, retval);
1230 write_unlock(&adapter->erp_lock);
1231 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1233 if (retval != ZFCP_ERP_CONTINUES)
1234 zfcp_erp_action_cleanup(action, adapter, port, unit, retval);
1237 * a few tasks remain when the erp queues are empty
1238 * (don't do that if the last action evaluated was dismissed
1239 * since this clearly indicates that there is more to come) :
1240 * - close the name server port if it is open yet
1241 * (enqueues another [probably] final action)
1242 * - otherwise, wake up whoever wants to be woken when we are
1245 if (retval != ZFCP_ERP_DISMISSED)
1246 zfcp_erp_strategy_check_queues(adapter);
1248 debug_text_event(adapter->erp_dbf, 6, "a_st_done");
1258 * returns: ZFCP_ERP_DISMISSED - if action has been dismissed
1259 * retval - otherwise
1262 zfcp_erp_strategy_check_action(struct zfcp_erp_action *erp_action, int retval)
1264 struct zfcp_adapter *adapter = erp_action->adapter;
1266 zfcp_erp_strategy_check_fsfreq(erp_action);
1268 debug_event(adapter->erp_dbf, 5, &erp_action->action, sizeof (int));
1269 if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1270 debug_text_event(adapter->erp_dbf, 3, "a_stcd_dis");
1271 zfcp_erp_action_dequeue(erp_action);
1272 retval = ZFCP_ERP_DISMISSED;
1274 debug_text_event(adapter->erp_dbf, 5, "a_stcd_nodis");
1280 zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1282 int retval = ZFCP_ERP_FAILED;
1283 struct zfcp_adapter *adapter = erp_action->adapter;
1286 * try to execute/continue action as far as possible,
1287 * note: no lock in subsequent strategy routines
1288 * (this allows these routine to call schedule, e.g.
1289 * kmalloc with such flags or qdio_initialize & friends)
1290 * Note: in case of timeout, the seperate strategies will fail
1291 * anyhow. No need for a special action. Even worse, a nameserver
1292 * failure would not wake up waiting ports without the call.
1294 switch (erp_action->action) {
1296 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1297 retval = zfcp_erp_adapter_strategy(erp_action);
1300 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1301 retval = zfcp_erp_port_forced_strategy(erp_action);
1304 case ZFCP_ERP_ACTION_REOPEN_PORT:
1305 retval = zfcp_erp_port_strategy(erp_action);
1308 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1309 retval = zfcp_erp_unit_strategy(erp_action);
1313 debug_text_exception(adapter->erp_dbf, 1, "a_stda_bug");
1314 debug_event(adapter->erp_dbf, 1, &erp_action->action,
1316 ZFCP_LOG_NORMAL("bug: unknown erp action requested on "
1317 "adapter %s (action=%d)\n",
1318 zfcp_get_busid_by_adapter(erp_action->adapter),
1319 erp_action->action);
1328 * purpose: triggers retry of this action after a certain amount of time
1329 * by means of timer provided by erp_action
1331 * returns: ZFCP_ERP_CONTINUES - erp_action sleeps in erp running queue
1334 zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
1336 int retval = ZFCP_ERP_CONTINUES;
1337 struct zfcp_adapter *adapter = erp_action->adapter;
1339 debug_text_event(adapter->erp_dbf, 6, "a_mwinit");
1340 debug_event(adapter->erp_dbf, 6, &erp_action->action, sizeof (int));
1341 init_timer(&erp_action->timer);
1342 erp_action->timer.function = zfcp_erp_memwait_handler;
1343 erp_action->timer.data = (unsigned long) erp_action;
1344 erp_action->timer.expires = jiffies + ZFCP_ERP_MEMWAIT_TIMEOUT;
1345 add_timer(&erp_action->timer);
1351 * function: zfcp_erp_adapter_failed
1353 * purpose: sets the adapter and all underlying devices to ERP_FAILED
1357 zfcp_erp_adapter_failed(struct zfcp_adapter *adapter)
1359 zfcp_erp_modify_adapter_status(adapter,
1360 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1361 ZFCP_LOG_NORMAL("adapter erp failed on adapter %s\n",
1362 zfcp_get_busid_by_adapter(adapter));
1363 debug_text_event(adapter->erp_dbf, 2, "a_afail");
1367 * function: zfcp_erp_port_failed
1369 * purpose: sets the port and all underlying devices to ERP_FAILED
1373 zfcp_erp_port_failed(struct zfcp_port *port)
1375 zfcp_erp_modify_port_status(port,
1376 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1378 if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
1379 ZFCP_LOG_NORMAL("port erp failed (adapter %s, "
1380 "port d_id=0x%06x)\n",
1381 zfcp_get_busid_by_port(port), port->d_id);
1383 ZFCP_LOG_NORMAL("port erp failed (adapter %s, wwpn=0x%016Lx)\n",
1384 zfcp_get_busid_by_port(port), port->wwpn);
1386 debug_text_event(port->adapter->erp_dbf, 2, "p_pfail");
1387 debug_event(port->adapter->erp_dbf, 2, &port->wwpn, sizeof (wwn_t));
1391 * function: zfcp_erp_unit_failed
1393 * purpose: sets the unit to ERP_FAILED
1397 zfcp_erp_unit_failed(struct zfcp_unit *unit)
1399 zfcp_erp_modify_unit_status(unit,
1400 ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1402 ZFCP_LOG_NORMAL("unit erp failed on unit 0x%016Lx on port 0x%016Lx "
1403 " on adapter %s\n", unit->fcp_lun,
1404 unit->port->wwpn, zfcp_get_busid_by_unit(unit));
1405 debug_text_event(unit->port->adapter->erp_dbf, 2, "u_ufail");
1406 debug_event(unit->port->adapter->erp_dbf, 2,
1407 &unit->fcp_lun, sizeof (fcp_lun_t));
1411 * function: zfcp_erp_strategy_check_target
1413 * purpose: increments the erp action count on the device currently in
1414 * recovery if the action failed or resets the count in case of
1415 * success. If a maximum count is exceeded the device is marked
1417 * The 'blocked' state of a target which has been recovered
1418 * successfully is reset.
1420 * returns: ZFCP_ERP_CONTINUES - action continues (not considered)
1421 * ZFCP_ERP_SUCCEEDED - action finished successfully
1422 * ZFCP_ERP_EXIT - action failed and will not continue
1425 zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action, int result)
1427 struct zfcp_adapter *adapter = erp_action->adapter;
1428 struct zfcp_port *port = erp_action->port;
1429 struct zfcp_unit *unit = erp_action->unit;
1431 debug_text_event(adapter->erp_dbf, 5, "a_stct_norm");
1432 debug_event(adapter->erp_dbf, 5, &erp_action->action, sizeof (int));
1433 debug_event(adapter->erp_dbf, 5, &result, sizeof (int));
1435 switch (erp_action->action) {
1437 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1438 result = zfcp_erp_strategy_check_unit(unit, result);
1441 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1442 case ZFCP_ERP_ACTION_REOPEN_PORT:
1443 result = zfcp_erp_strategy_check_port(port, result);
1446 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1447 result = zfcp_erp_strategy_check_adapter(adapter, result);
1455 zfcp_erp_strategy_statechange(int action,
1457 struct zfcp_adapter *adapter,
1458 struct zfcp_port *port,
1459 struct zfcp_unit *unit, int retval)
1461 debug_text_event(adapter->erp_dbf, 3, "a_stsc");
1462 debug_event(adapter->erp_dbf, 3, &action, sizeof (int));
1466 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1467 if (zfcp_erp_strategy_statechange_detected(&adapter->status,
1469 zfcp_erp_adapter_reopen_internal(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
1470 retval = ZFCP_ERP_EXIT;
1474 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1475 case ZFCP_ERP_ACTION_REOPEN_PORT:
1476 if (zfcp_erp_strategy_statechange_detected(&port->status,
1478 zfcp_erp_port_reopen_internal(port, ZFCP_STATUS_COMMON_ERP_FAILED);
1479 retval = ZFCP_ERP_EXIT;
1483 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1484 if (zfcp_erp_strategy_statechange_detected(&unit->status,
1486 zfcp_erp_unit_reopen_internal(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
1487 retval = ZFCP_ERP_EXIT;
1496 zfcp_erp_strategy_statechange_detected(atomic_t * target_status, u32 erp_status)
1499 /* take it online */
1500 (atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, target_status) &&
1501 (ZFCP_STATUS_ERP_CLOSE_ONLY & erp_status)) ||
1502 /* take it offline */
1503 (!atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, target_status) &&
1504 !(ZFCP_STATUS_ERP_CLOSE_ONLY & erp_status));
1508 zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
1510 debug_text_event(unit->port->adapter->erp_dbf, 5, "u_stct");
1511 debug_event(unit->port->adapter->erp_dbf, 5, &unit->fcp_lun,
1512 sizeof (fcp_lun_t));
1515 case ZFCP_ERP_SUCCEEDED :
1516 atomic_set(&unit->erp_counter, 0);
1517 zfcp_erp_unit_unblock(unit);
1519 case ZFCP_ERP_FAILED :
1520 atomic_inc(&unit->erp_counter);
1521 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS)
1522 zfcp_erp_unit_failed(unit);
1524 case ZFCP_ERP_EXIT :
1529 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status)) {
1530 zfcp_erp_unit_block(unit, 0); /* for ZFCP_ERP_SUCCEEDED */
1531 result = ZFCP_ERP_EXIT;
1538 zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1540 debug_text_event(port->adapter->erp_dbf, 5, "p_stct");
1541 debug_event(port->adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
1544 case ZFCP_ERP_SUCCEEDED :
1545 atomic_set(&port->erp_counter, 0);
1546 zfcp_erp_port_unblock(port);
1548 case ZFCP_ERP_FAILED :
1549 atomic_inc(&port->erp_counter);
1550 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS)
1551 zfcp_erp_port_failed(port);
1553 case ZFCP_ERP_EXIT :
1558 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
1559 zfcp_erp_port_block(port, 0); /* for ZFCP_ERP_SUCCEEDED */
1560 result = ZFCP_ERP_EXIT;
1567 zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter, int result)
1569 debug_text_event(adapter->erp_dbf, 5, "a_stct");
1572 case ZFCP_ERP_SUCCEEDED :
1573 atomic_set(&adapter->erp_counter, 0);
1574 zfcp_erp_adapter_unblock(adapter);
1576 case ZFCP_ERP_FAILED :
1577 atomic_inc(&adapter->erp_counter);
1578 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS)
1579 zfcp_erp_adapter_failed(adapter);
1581 case ZFCP_ERP_EXIT :
1586 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) {
1587 zfcp_erp_adapter_block(adapter, 0); /* for ZFCP_ERP_SUCCEEDED */
1588 result = ZFCP_ERP_EXIT;
1594 struct zfcp_erp_add_work {
1595 struct zfcp_unit *unit;
1596 struct work_struct work;
1600 * zfcp_erp_scsi_scan
1601 * @data: pointer to a struct zfcp_erp_add_work
1603 * Registers a logical unit with the SCSI stack.
1605 static void zfcp_erp_scsi_scan(struct work_struct *work)
1607 struct zfcp_erp_add_work *p =
1608 container_of(work, struct zfcp_erp_add_work, work);
1609 struct zfcp_unit *unit = p->unit;
1610 struct fc_rport *rport = unit->port->rport;
1611 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
1613 atomic_clear_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1614 wake_up(&unit->scsi_scan_wq);
1615 zfcp_unit_put(unit);
1620 * zfcp_erp_schedule_work
1621 * @unit: pointer to unit which should be registered with SCSI stack
1623 * Schedules work which registers a unit with the SCSI stack
1626 zfcp_erp_schedule_work(struct zfcp_unit *unit)
1628 struct zfcp_erp_add_work *p;
1630 p = kzalloc(sizeof(*p), GFP_KERNEL);
1632 ZFCP_LOG_NORMAL("error: Out of resources. Could not register "
1633 "the FCP-LUN 0x%Lx connected to "
1634 "the port with WWPN 0x%Lx connected to "
1635 "the adapter %s with the SCSI stack.\n",
1638 zfcp_get_busid_by_unit(unit));
1642 zfcp_unit_get(unit);
1643 atomic_set_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
1644 INIT_WORK(&p->work, zfcp_erp_scsi_scan);
1646 schedule_work(&p->work);
1652 * purpose: remaining things in good cases,
1653 * escalation in bad cases
1658 zfcp_erp_strategy_followup_actions(int action,
1659 struct zfcp_adapter *adapter,
1660 struct zfcp_port *port,
1661 struct zfcp_unit *unit, int status)
1663 debug_text_event(adapter->erp_dbf, 5, "a_stfol");
1664 debug_event(adapter->erp_dbf, 5, &action, sizeof (int));
1666 /* initiate follow-up actions depending on success of finished action */
1669 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1670 if (status == ZFCP_ERP_SUCCEEDED)
1671 zfcp_erp_port_reopen_all_internal(adapter, 0);
1673 zfcp_erp_adapter_reopen_internal(adapter, 0);
1676 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1677 if (status == ZFCP_ERP_SUCCEEDED)
1678 zfcp_erp_port_reopen_internal(port, 0);
1680 zfcp_erp_adapter_reopen_internal(adapter, 0);
1683 case ZFCP_ERP_ACTION_REOPEN_PORT:
1684 if (status == ZFCP_ERP_SUCCEEDED)
1685 zfcp_erp_unit_reopen_all_internal(port, 0);
1687 zfcp_erp_port_forced_reopen_internal(port, 0);
1690 case ZFCP_ERP_ACTION_REOPEN_UNIT:
1691 /* Nothing to do if status == ZFCP_ERP_SUCCEEDED */
1692 if (status != ZFCP_ERP_SUCCEEDED)
1693 zfcp_erp_port_reopen_internal(unit->port, 0);
1701 zfcp_erp_strategy_check_queues(struct zfcp_adapter *adapter)
1703 unsigned long flags;
1705 read_lock_irqsave(&zfcp_data.config_lock, flags);
1706 read_lock(&adapter->erp_lock);
1707 if (list_empty(&adapter->erp_ready_head) &&
1708 list_empty(&adapter->erp_running_head)) {
1709 debug_text_event(adapter->erp_dbf, 4, "a_cq_wake");
1710 atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
1712 wake_up(&adapter->erp_done_wqh);
1714 debug_text_event(adapter->erp_dbf, 5, "a_cq_notempty");
1715 read_unlock(&adapter->erp_lock);
1716 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1722 * zfcp_erp_wait - wait for completion of error recovery on an adapter
1723 * @adapter: adapter for which to wait for completion of its error recovery
1727 zfcp_erp_wait(struct zfcp_adapter *adapter)
1731 wait_event(adapter->erp_done_wqh,
1732 !atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
1739 zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter,
1740 u32 mask, int set_or_clear)
1742 struct zfcp_port *port;
1743 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1745 if (set_or_clear == ZFCP_SET) {
1746 atomic_set_mask(mask, &adapter->status);
1747 debug_text_event(adapter->erp_dbf, 3, "a_mod_as_s");
1749 atomic_clear_mask(mask, &adapter->status);
1750 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1751 atomic_set(&adapter->erp_counter, 0);
1752 debug_text_event(adapter->erp_dbf, 3, "a_mod_as_c");
1754 debug_event(adapter->erp_dbf, 3, &mask, sizeof (u32));
1756 /* Deal with all underlying devices, only pass common_mask */
1758 list_for_each_entry(port, &adapter->port_list_head, list)
1759 zfcp_erp_modify_port_status(port, common_mask,
1764 * function: zfcp_erp_modify_port_status
1766 * purpose: sets the port and all underlying devices to ERP_FAILED
1770 zfcp_erp_modify_port_status(struct zfcp_port *port, u32 mask, int set_or_clear)
1772 struct zfcp_unit *unit;
1773 u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1775 if (set_or_clear == ZFCP_SET) {
1776 atomic_set_mask(mask, &port->status);
1777 debug_text_event(port->adapter->erp_dbf, 3, "p_mod_ps_s");
1779 atomic_clear_mask(mask, &port->status);
1780 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1781 atomic_set(&port->erp_counter, 0);
1782 debug_text_event(port->adapter->erp_dbf, 3, "p_mod_ps_c");
1784 debug_event(port->adapter->erp_dbf, 3, &port->wwpn, sizeof (wwn_t));
1785 debug_event(port->adapter->erp_dbf, 3, &mask, sizeof (u32));
1787 /* Modify status of all underlying devices, only pass common mask */
1789 list_for_each_entry(unit, &port->unit_list_head, list)
1790 zfcp_erp_modify_unit_status(unit, common_mask,
1795 * function: zfcp_erp_modify_unit_status
1797 * purpose: sets the unit to ERP_FAILED
1801 zfcp_erp_modify_unit_status(struct zfcp_unit *unit, u32 mask, int set_or_clear)
1803 if (set_or_clear == ZFCP_SET) {
1804 atomic_set_mask(mask, &unit->status);
1805 debug_text_event(unit->port->adapter->erp_dbf, 3, "u_mod_us_s");
1807 atomic_clear_mask(mask, &unit->status);
1808 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1809 atomic_set(&unit->erp_counter, 0);
1811 debug_text_event(unit->port->adapter->erp_dbf, 3, "u_mod_us_c");
1813 debug_event(unit->port->adapter->erp_dbf, 3, &unit->fcp_lun,
1814 sizeof (fcp_lun_t));
1815 debug_event(unit->port->adapter->erp_dbf, 3, &mask, sizeof (u32));
1821 * purpose: Wrappper for zfcp_erp_port_reopen_all_internal
1822 * used to ensure the correct locking
1824 * returns: 0 - initiated action successfully
1825 * <0 - failed to initiate action
1828 zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter, int clear_mask)
1831 unsigned long flags;
1833 read_lock_irqsave(&zfcp_data.config_lock, flags);
1834 write_lock(&adapter->erp_lock);
1835 retval = zfcp_erp_port_reopen_all_internal(adapter, clear_mask);
1836 write_unlock(&adapter->erp_lock);
1837 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1843 zfcp_erp_port_reopen_all_internal(struct zfcp_adapter *adapter, int clear_mask)
1846 struct zfcp_port *port;
1848 list_for_each_entry(port, &adapter->port_list_head, list)
1849 if (!atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
1850 zfcp_erp_port_reopen_internal(port, clear_mask);
1863 zfcp_erp_unit_reopen_all_internal(struct zfcp_port *port, int clear_mask)
1866 struct zfcp_unit *unit;
1868 list_for_each_entry(unit, &port->unit_list_head, list)
1869 zfcp_erp_unit_reopen_internal(unit, clear_mask);
1877 * purpose: this routine executes the 'Reopen Adapter' action
1878 * (the entire action is processed synchronously, since
1879 * there are no actions which might be run concurrently
1882 * returns: ZFCP_ERP_SUCCEEDED - action finished successfully
1883 * ZFCP_ERP_FAILED - action finished unsuccessfully
1886 zfcp_erp_adapter_strategy(struct zfcp_erp_action *erp_action)
1889 struct zfcp_adapter *adapter = erp_action->adapter;
1891 retval = zfcp_erp_adapter_strategy_close(erp_action);
1892 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
1893 retval = ZFCP_ERP_EXIT;
1895 retval = zfcp_erp_adapter_strategy_open(erp_action);
1897 debug_text_event(adapter->erp_dbf, 3, "a_ast/ret");
1898 debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
1899 debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
1901 if (retval == ZFCP_ERP_FAILED) {
1902 ZFCP_LOG_INFO("Waiting to allow the adapter %s "
1903 "to recover itself\n",
1904 zfcp_get_busid_by_adapter(adapter));
1905 msleep(jiffies_to_msecs(ZFCP_TYPE2_RECOVERY_TIME));
1916 * returns: ZFCP_ERP_SUCCEEDED - action finished successfully
1917 * ZFCP_ERP_FAILED - action finished unsuccessfully
1920 zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *erp_action)
1924 atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING,
1925 &erp_action->adapter->status);
1926 retval = zfcp_erp_adapter_strategy_generic(erp_action, 1);
1927 atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING,
1928 &erp_action->adapter->status);
1938 * returns: ZFCP_ERP_SUCCEEDED - action finished successfully
1939 * ZFCP_ERP_FAILED - action finished unsuccessfully
1942 zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *erp_action)
1946 atomic_set_mask(ZFCP_STATUS_COMMON_OPENING,
1947 &erp_action->adapter->status);
1948 retval = zfcp_erp_adapter_strategy_generic(erp_action, 0);
1949 atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING,
1950 &erp_action->adapter->status);
1956 * function: zfcp_register_adapter
1958 * purpose: allocate the irq associated with this devno and register
1959 * the FSF adapter with the SCSI stack
1964 zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *erp_action, int close)
1966 int retval = ZFCP_ERP_SUCCEEDED;
1971 retval = zfcp_erp_adapter_strategy_open_qdio(erp_action);
1972 if (retval != ZFCP_ERP_SUCCEEDED)
1975 retval = zfcp_erp_adapter_strategy_open_fsf(erp_action);
1976 if (retval != ZFCP_ERP_SUCCEEDED)
1977 goto failed_openfcp;
1979 atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &erp_action->adapter->status);
1983 atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
1984 &erp_action->adapter->status);
1987 zfcp_close_fsf(erp_action->adapter);
1989 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
1990 ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
1991 ZFCP_STATUS_ADAPTER_XPORT_OK,
1992 &erp_action->adapter->status);
1998 * function: zfcp_qdio_init
2000 * purpose: setup QDIO operation for specified adapter
2002 * returns: 0 - successful setup
2006 zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *erp_action)
2010 volatile struct qdio_buffer_element *sbale;
2011 struct zfcp_adapter *adapter = erp_action->adapter;
2013 if (atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
2014 ZFCP_LOG_NORMAL("bug: second attempt to set up QDIO on "
2016 zfcp_get_busid_by_adapter(adapter));
2020 if (qdio_establish(&adapter->qdio_init_data) != 0) {
2021 ZFCP_LOG_INFO("error: establishment of QDIO queues failed "
2023 zfcp_get_busid_by_adapter(adapter));
2024 goto failed_qdio_establish;
2026 debug_text_event(adapter->erp_dbf, 3, "qdio_est");
2028 if (qdio_activate(adapter->ccw_device, 0) != 0) {
2029 ZFCP_LOG_INFO("error: activation of QDIO queues failed "
2031 zfcp_get_busid_by_adapter(adapter));
2032 goto failed_qdio_activate;
2034 debug_text_event(adapter->erp_dbf, 3, "qdio_act");
2037 * put buffers into response queue,
2039 for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
2040 sbale = &(adapter->response_queue.buffer[i]->element[0]);
2042 sbale->flags = SBAL_FLAGS_LAST_ENTRY;
2046 ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, "
2047 "queue_no=%i, index_in_queue=%i, count=%i)\n",
2048 zfcp_get_busid_by_adapter(adapter),
2049 QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q);
2051 retval = do_QDIO(adapter->ccw_device,
2052 QDIO_FLAG_SYNC_INPUT,
2053 0, 0, QDIO_MAX_BUFFERS_PER_Q, NULL);
2056 ZFCP_LOG_NORMAL("bug: setup of QDIO failed (retval=%d)\n",
2058 goto failed_do_qdio;
2060 adapter->response_queue.free_index = 0;
2061 atomic_set(&adapter->response_queue.free_count, 0);
2062 ZFCP_LOG_DEBUG("%i buffers successfully enqueued to "
2063 "response queue\n", QDIO_MAX_BUFFERS_PER_Q);
2065 /* set index of first avalable SBALS / number of available SBALS */
2066 adapter->request_queue.free_index = 0;
2067 atomic_set(&adapter->request_queue.free_count, QDIO_MAX_BUFFERS_PER_Q);
2068 adapter->request_queue.distance_from_int = 0;
2070 /* initialize waitqueue used to wait for free SBALs in requests queue */
2071 init_waitqueue_head(&adapter->request_wq);
2073 /* ok, we did it - skip all cleanups for different failures */
2074 atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
2075 retval = ZFCP_ERP_SUCCEEDED;
2081 failed_qdio_activate:
2082 debug_text_event(adapter->erp_dbf, 3, "qdio_down1a");
2083 while (qdio_shutdown(adapter->ccw_device,
2084 QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS)
2086 debug_text_event(adapter->erp_dbf, 3, "qdio_down1b");
2088 failed_qdio_establish:
2090 retval = ZFCP_ERP_FAILED;
2098 zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *erp_action)
2102 retval = zfcp_erp_adapter_strategy_open_fsf_xconfig(erp_action);
2103 if (retval == ZFCP_ERP_FAILED)
2104 return ZFCP_ERP_FAILED;
2106 retval = zfcp_erp_adapter_strategy_open_fsf_xport(erp_action);
2107 if (retval == ZFCP_ERP_FAILED)
2108 return ZFCP_ERP_FAILED;
2110 return zfcp_erp_adapter_strategy_open_fsf_statusread(erp_action);
2114 zfcp_erp_adapter_strategy_open_fsf_xconfig(struct zfcp_erp_action *erp_action)
2116 int retval = ZFCP_ERP_SUCCEEDED;
2118 int sleep = ZFCP_EXCHANGE_CONFIG_DATA_FIRST_SLEEP;
2119 struct zfcp_adapter *adapter = erp_action->adapter;
2121 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
2123 for (retries = ZFCP_EXCHANGE_CONFIG_DATA_RETRIES; retries; retries--) {
2124 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
2126 ZFCP_LOG_DEBUG("Doing exchange config data\n");
2127 write_lock_irq(&adapter->erp_lock);
2128 zfcp_erp_action_to_running(erp_action);
2129 write_unlock_irq(&adapter->erp_lock);
2130 if (zfcp_fsf_exchange_config_data(erp_action)) {
2131 retval = ZFCP_ERP_FAILED;
2132 debug_text_event(adapter->erp_dbf, 5, "a_fstx_xf");
2133 ZFCP_LOG_INFO("error: initiation of exchange of "
2134 "configuration data failed for "
2136 zfcp_get_busid_by_adapter(adapter));
2139 debug_text_event(adapter->erp_dbf, 6, "a_fstx_xok");
2140 ZFCP_LOG_DEBUG("Xchange underway\n");
2144 * Both the normal completion handler as well as the timeout
2145 * handler will do an 'up' when the 'exchange config data'
2146 * request completes or times out. Thus, the signal to go on
2147 * won't be lost utilizing this semaphore.
2148 * Furthermore, this 'adapter_reopen' action is
2149 * guaranteed to be the only action being there (highest action
2150 * which prevents other actions from being created).
2151 * Resulting from that, the wake signal recognized here
2152 * _must_ be the one belonging to the 'exchange config
2155 down(&adapter->erp_ready_sem);
2156 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
2157 ZFCP_LOG_INFO("error: exchange of configuration data "
2158 "for adapter %s timed out\n",
2159 zfcp_get_busid_by_adapter(adapter));
2163 if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
2167 ZFCP_LOG_DEBUG("host connection still initialising... "
2168 "waiting and retrying...\n");
2169 /* sleep a little bit before retry */
2170 msleep(jiffies_to_msecs(sleep));
2174 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
2177 if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
2178 &adapter->status)) {
2179 ZFCP_LOG_INFO("error: exchange of configuration data for "
2180 "adapter %s failed\n",
2181 zfcp_get_busid_by_adapter(adapter));
2182 retval = ZFCP_ERP_FAILED;
2189 zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *erp_action)
2192 struct zfcp_adapter *adapter;
2194 adapter = erp_action->adapter;
2195 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status);
2197 write_lock_irq(&adapter->erp_lock);
2198 zfcp_erp_action_to_running(erp_action);
2199 write_unlock_irq(&adapter->erp_lock);
2201 ret = zfcp_fsf_exchange_port_data(erp_action);
2202 if (ret == -EOPNOTSUPP) {
2203 debug_text_event(adapter->erp_dbf, 3, "a_xport_notsupp");
2204 return ZFCP_ERP_SUCCEEDED;
2206 debug_text_event(adapter->erp_dbf, 3, "a_xport_failed");
2207 return ZFCP_ERP_FAILED;
2209 debug_text_event(adapter->erp_dbf, 6, "a_xport_ok");
2211 ret = ZFCP_ERP_SUCCEEDED;
2212 down(&adapter->erp_ready_sem);
2213 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
2214 ZFCP_LOG_INFO("error: exchange port data timed out (adapter "
2215 "%s)\n", zfcp_get_busid_by_adapter(adapter));
2216 ret = ZFCP_ERP_FAILED;
2219 /* don't treat as error for the sake of compatibility */
2220 if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_XPORT_OK, &adapter->status))
2221 ZFCP_LOG_INFO("warning: exchange port data failed (adapter "
2222 "%s\n", zfcp_get_busid_by_adapter(adapter));
2228 zfcp_erp_adapter_strategy_open_fsf_statusread(struct zfcp_erp_action
2231 int retval = ZFCP_ERP_SUCCEEDED;
2233 struct zfcp_adapter *adapter = erp_action->adapter;
2236 adapter->status_read_failed = 0;
2237 for (i = 0; i < ZFCP_STATUS_READS_RECOM; i++) {
2238 temp_ret = zfcp_fsf_status_read(adapter, ZFCP_WAIT_FOR_SBAL);
2240 ZFCP_LOG_INFO("error: set-up of unsolicited status "
2241 "notification failed on adapter %s\n",
2242 zfcp_get_busid_by_adapter(adapter));
2243 retval = ZFCP_ERP_FAILED;
2255 * purpose: this routine executes the 'Reopen Physical Port' action
2257 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
2258 * ZFCP_ERP_SUCCEEDED - action finished successfully
2259 * ZFCP_ERP_FAILED - action finished unsuccessfully
2262 zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
2264 int retval = ZFCP_ERP_FAILED;
2265 struct zfcp_port *port = erp_action->port;
2266 struct zfcp_adapter *adapter = erp_action->adapter;
2268 switch (erp_action->step) {
2272 * the ULP spec. begs for waiting for oustanding commands
2274 case ZFCP_ERP_STEP_UNINITIALIZED:
2275 zfcp_erp_port_strategy_clearstati(port);
2277 * it would be sufficient to test only the normal open flag
2278 * since the phys. open flag cannot be set if the normal
2279 * open flag is unset - however, this is for readabilty ...
2281 if (atomic_test_mask((ZFCP_STATUS_PORT_PHYS_OPEN |
2282 ZFCP_STATUS_COMMON_OPEN),
2284 ZFCP_LOG_DEBUG("port 0x%016Lx is open -> trying "
2285 "close physical\n", port->wwpn);
2287 zfcp_erp_port_forced_strategy_close(erp_action);
2289 retval = ZFCP_ERP_FAILED;
2292 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
2293 if (atomic_test_mask(ZFCP_STATUS_PORT_PHYS_OPEN,
2295 ZFCP_LOG_DEBUG("close physical failed for port "
2296 "0x%016Lx\n", port->wwpn);
2297 retval = ZFCP_ERP_FAILED;
2299 retval = ZFCP_ERP_SUCCEEDED;
2303 debug_text_event(adapter->erp_dbf, 3, "p_pfst/ret");
2304 debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof (wwn_t));
2305 debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
2306 debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
2314 * purpose: this routine executes the 'Reopen Port' action
2316 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
2317 * ZFCP_ERP_SUCCEEDED - action finished successfully
2318 * ZFCP_ERP_FAILED - action finished unsuccessfully
2321 zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
2323 int retval = ZFCP_ERP_FAILED;
2324 struct zfcp_port *port = erp_action->port;
2325 struct zfcp_adapter *adapter = erp_action->adapter;
2327 switch (erp_action->step) {
2331 * the ULP spec. begs for waiting for oustanding commands
2333 case ZFCP_ERP_STEP_UNINITIALIZED:
2334 zfcp_erp_port_strategy_clearstati(port);
2335 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &port->status)) {
2336 ZFCP_LOG_DEBUG("port 0x%016Lx is open -> trying "
2337 "close\n", port->wwpn);
2338 retval = zfcp_erp_port_strategy_close(erp_action);
2340 } /* else it's already closed, open it */
2343 case ZFCP_ERP_STEP_PORT_CLOSING:
2344 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &port->status)) {
2345 ZFCP_LOG_DEBUG("close failed for port 0x%016Lx\n",
2347 retval = ZFCP_ERP_FAILED;
2349 } /* else it's closed now, open it */
2352 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
2353 retval = ZFCP_ERP_EXIT;
2355 retval = zfcp_erp_port_strategy_open(erp_action);
2358 debug_text_event(adapter->erp_dbf, 3, "p_pst/ret");
2359 debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof (wwn_t));
2360 debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
2361 debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
2367 zfcp_erp_port_strategy_open(struct zfcp_erp_action *erp_action)
2371 if (atomic_test_mask(ZFCP_STATUS_PORT_WKA,
2372 &erp_action->port->status))
2373 retval = zfcp_erp_port_strategy_open_nameserver(erp_action);
2375 retval = zfcp_erp_port_strategy_open_common(erp_action);
2381 zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *erp_action)
2384 struct zfcp_adapter *adapter = erp_action->adapter;
2385 struct zfcp_port *port = erp_action->port;
2387 switch (erp_action->step) {
2389 case ZFCP_ERP_STEP_UNINITIALIZED:
2390 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
2391 case ZFCP_ERP_STEP_PORT_CLOSING:
2392 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP) {
2393 if (port->wwpn != adapter->peer_wwpn) {
2394 ZFCP_LOG_NORMAL("Failed to open port 0x%016Lx "
2395 "on adapter %s.\nPeer WWPN "
2396 "0x%016Lx does not match\n",
2398 zfcp_get_busid_by_adapter(adapter),
2399 adapter->peer_wwpn);
2400 zfcp_erp_port_failed(port);
2401 retval = ZFCP_ERP_FAILED;
2404 port->d_id = adapter->peer_d_id;
2405 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
2406 retval = zfcp_erp_port_strategy_open_port(erp_action);
2409 if (!(adapter->nameserver_port)) {
2410 retval = zfcp_nameserver_enqueue(adapter);
2412 ZFCP_LOG_NORMAL("error: nameserver port "
2413 "unavailable for adapter %s\n",
2414 zfcp_get_busid_by_adapter(adapter));
2415 retval = ZFCP_ERP_FAILED;
2419 if (!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
2420 &adapter->nameserver_port->status)) {
2421 ZFCP_LOG_DEBUG("nameserver port is not open -> open "
2422 "nameserver port\n");
2423 /* nameserver port may live again */
2424 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING,
2425 &adapter->nameserver_port->status);
2426 if (zfcp_erp_port_reopen(adapter->nameserver_port, 0)
2429 ZFCP_ERP_STEP_NAMESERVER_OPEN;
2430 retval = ZFCP_ERP_CONTINUES;
2432 retval = ZFCP_ERP_FAILED;
2435 /* else nameserver port is already open, fall through */
2436 case ZFCP_ERP_STEP_NAMESERVER_OPEN:
2437 if (!atomic_test_mask(ZFCP_STATUS_COMMON_OPEN,
2438 &adapter->nameserver_port->status)) {
2439 ZFCP_LOG_DEBUG("open failed for nameserver port\n");
2440 retval = ZFCP_ERP_FAILED;
2442 ZFCP_LOG_DEBUG("nameserver port is open -> "
2443 "nameserver look-up for port 0x%016Lx\n",
2445 retval = zfcp_erp_port_strategy_open_common_lookup
2450 case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
2451 if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status)) {
2452 if (atomic_test_mask
2453 (ZFCP_STATUS_PORT_INVALID_WWPN, &port->status)) {
2454 ZFCP_LOG_DEBUG("nameserver look-up failed "
2455 "for port 0x%016Lx "
2456 "(misconfigured WWPN?)\n",
2458 zfcp_erp_port_failed(port);
2459 retval = ZFCP_ERP_EXIT;
2461 ZFCP_LOG_DEBUG("nameserver look-up failed for "
2462 "port 0x%016Lx\n", port->wwpn);
2463 retval = ZFCP_ERP_FAILED;
2466 ZFCP_LOG_DEBUG("port 0x%016Lx has d_id=0x%06x -> "
2467 "trying open\n", port->wwpn, port->d_id);
2468 retval = zfcp_erp_port_strategy_open_port(erp_action);
2472 case ZFCP_ERP_STEP_PORT_OPENING:
2473 /* D_ID might have changed during open */
2474 if (atomic_test_mask((ZFCP_STATUS_COMMON_OPEN |
2475 ZFCP_STATUS_PORT_DID_DID),
2477 ZFCP_LOG_DEBUG("port 0x%016Lx is open\n", port->wwpn);
2478 retval = ZFCP_ERP_SUCCEEDED;
2480 ZFCP_LOG_DEBUG("open failed for port 0x%016Lx\n",
2482 retval = ZFCP_ERP_FAILED;
2487 ZFCP_LOG_NORMAL("bug: unknown erp step 0x%08x\n",
2489 retval = ZFCP_ERP_FAILED;
2496 zfcp_erp_port_strategy_open_nameserver(struct zfcp_erp_action *erp_action)
2499 struct zfcp_port *port = erp_action->port;
2501 switch (erp_action->step) {
2503 case ZFCP_ERP_STEP_UNINITIALIZED:
2504 case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
2505 case ZFCP_ERP_STEP_PORT_CLOSING:
2506 ZFCP_LOG_DEBUG("port 0x%016Lx has d_id=0x%06x -> trying open\n",
2507 port->wwpn, port->d_id);
2508 retval = zfcp_erp_port_strategy_open_port(erp_action);
2511 case ZFCP_ERP_STEP_PORT_OPENING:
2512 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &port->status)) {
2513 ZFCP_LOG_DEBUG("WKA port is open\n");
2514 retval = ZFCP_ERP_SUCCEEDED;
2516 ZFCP_LOG_DEBUG("open failed for WKA port\n");
2517 retval = ZFCP_ERP_FAILED;
2519 /* this is needed anyway (dont care for retval of wakeup) */
2520 ZFCP_LOG_DEBUG("continue other open port operations\n");
2521 zfcp_erp_port_strategy_open_nameserver_wakeup(erp_action);
2525 ZFCP_LOG_NORMAL("bug: unknown erp step 0x%08x\n",
2527 retval = ZFCP_ERP_FAILED;
2536 * purpose: makes the erp thread continue with reopen (physical) port
2537 * actions which have been paused until the name server port
2538 * is opened (or failed)
2540 * returns: 0 (a kind of void retval, its not used)
2543 zfcp_erp_port_strategy_open_nameserver_wakeup(struct zfcp_erp_action
2547 unsigned long flags;
2548 struct zfcp_adapter *adapter = ns_erp_action->adapter;
2549 struct zfcp_erp_action *erp_action, *tmp;
2551 read_lock_irqsave(&adapter->erp_lock, flags);
2552 list_for_each_entry_safe(erp_action, tmp, &adapter->erp_running_head,
2554 debug_text_event(adapter->erp_dbf, 4, "p_pstnsw_n");
2555 debug_event(adapter->erp_dbf, 4, &erp_action->port->wwpn,
2557 if (erp_action->step == ZFCP_ERP_STEP_NAMESERVER_OPEN) {
2558 debug_text_event(adapter->erp_dbf, 3, "p_pstnsw_w");
2559 debug_event(adapter->erp_dbf, 3,
2560 &erp_action->port->wwpn, sizeof (wwn_t));
2561 if (atomic_test_mask(
2562 ZFCP_STATUS_COMMON_ERP_FAILED,
2563 &adapter->nameserver_port->status))
2564 zfcp_erp_port_failed(erp_action->port);
2565 zfcp_erp_action_ready(erp_action);
2568 read_unlock_irqrestore(&adapter->erp_lock, flags);
2578 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
2579 * ZFCP_ERP_FAILED - action finished unsuccessfully
2582 zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *erp_action)
2585 struct zfcp_adapter *adapter = erp_action->adapter;
2586 struct zfcp_port *port = erp_action->port;
2588 retval = zfcp_fsf_close_physical_port(erp_action);
2589 if (retval == -ENOMEM) {
2590 debug_text_event(adapter->erp_dbf, 5, "o_pfstc_nomem");
2591 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2592 retval = ZFCP_ERP_NOMEM;
2595 erp_action->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
2597 debug_text_event(adapter->erp_dbf, 5, "o_pfstc_cpf");
2598 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2599 /* could not send 'open', fail */
2600 retval = ZFCP_ERP_FAILED;
2603 debug_text_event(adapter->erp_dbf, 6, "o_pfstc_cpok");
2604 debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
2605 retval = ZFCP_ERP_CONTINUES;
2611 zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
2614 struct zfcp_adapter *adapter = port->adapter;
2616 debug_text_event(adapter->erp_dbf, 5, "p_pstclst");
2617 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2619 atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING |
2620 ZFCP_STATUS_COMMON_CLOSING |
2621 ZFCP_STATUS_COMMON_ACCESS_DENIED |
2622 ZFCP_STATUS_PORT_DID_DID |
2623 ZFCP_STATUS_PORT_PHYS_CLOSING |
2624 ZFCP_STATUS_PORT_INVALID_WWPN,
2634 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
2635 * ZFCP_ERP_FAILED - action finished unsuccessfully
2638 zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
2641 struct zfcp_adapter *adapter = erp_action->adapter;
2642 struct zfcp_port *port = erp_action->port;
2644 retval = zfcp_fsf_close_port(erp_action);
2645 if (retval == -ENOMEM) {
2646 debug_text_event(adapter->erp_dbf, 5, "p_pstc_nomem");
2647 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2648 retval = ZFCP_ERP_NOMEM;
2651 erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
2653 debug_text_event(adapter->erp_dbf, 5, "p_pstc_cpf");
2654 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2655 /* could not send 'close', fail */
2656 retval = ZFCP_ERP_FAILED;
2659 debug_text_event(adapter->erp_dbf, 6, "p_pstc_cpok");
2660 debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
2661 retval = ZFCP_ERP_CONTINUES;
2671 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
2672 * ZFCP_ERP_FAILED - action finished unsuccessfully
2675 zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
2678 struct zfcp_adapter *adapter = erp_action->adapter;
2679 struct zfcp_port *port = erp_action->port;
2681 retval = zfcp_fsf_open_port(erp_action);
2682 if (retval == -ENOMEM) {
2683 debug_text_event(adapter->erp_dbf, 5, "p_psto_nomem");
2684 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2685 retval = ZFCP_ERP_NOMEM;
2688 erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
2690 debug_text_event(adapter->erp_dbf, 5, "p_psto_opf");
2691 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2692 /* could not send 'open', fail */
2693 retval = ZFCP_ERP_FAILED;
2696 debug_text_event(adapter->erp_dbf, 6, "p_psto_opok");
2697 debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
2698 retval = ZFCP_ERP_CONTINUES;
2708 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
2709 * ZFCP_ERP_FAILED - action finished unsuccessfully
2712 zfcp_erp_port_strategy_open_common_lookup(struct zfcp_erp_action *erp_action)
2715 struct zfcp_adapter *adapter = erp_action->adapter;
2716 struct zfcp_port *port = erp_action->port;
2718 retval = zfcp_ns_gid_pn_request(erp_action);
2719 if (retval == -ENOMEM) {
2720 debug_text_event(adapter->erp_dbf, 5, "p_pstn_nomem");
2721 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2722 retval = ZFCP_ERP_NOMEM;
2725 erp_action->step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
2727 debug_text_event(adapter->erp_dbf, 5, "p_pstn_ref");
2728 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
2729 /* could not send nameserver request, fail */
2730 retval = ZFCP_ERP_FAILED;
2733 debug_text_event(adapter->erp_dbf, 6, "p_pstn_reok");
2734 debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
2735 retval = ZFCP_ERP_CONTINUES;
2743 * purpose: this routine executes the 'Reopen Unit' action
2744 * currently no retries
2746 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
2747 * ZFCP_ERP_SUCCEEDED - action finished successfully
2748 * ZFCP_ERP_FAILED - action finished unsuccessfully
2751 zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
2753 int retval = ZFCP_ERP_FAILED;
2754 struct zfcp_unit *unit = erp_action->unit;
2755 struct zfcp_adapter *adapter = erp_action->adapter;
2757 switch (erp_action->step) {
2761 * the ULP spec. begs for waiting for oustanding commands
2763 case ZFCP_ERP_STEP_UNINITIALIZED:
2764 zfcp_erp_unit_strategy_clearstati(unit);
2765 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status)) {
2766 ZFCP_LOG_DEBUG("unit 0x%016Lx is open -> "
2767 "trying close\n", unit->fcp_lun);
2768 retval = zfcp_erp_unit_strategy_close(erp_action);
2771 /* else it's already closed, fall through */
2772 case ZFCP_ERP_STEP_UNIT_CLOSING:
2773 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status)) {
2774 ZFCP_LOG_DEBUG("close failed for unit 0x%016Lx\n",
2776 retval = ZFCP_ERP_FAILED;
2778 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
2779 retval = ZFCP_ERP_EXIT;
2781 ZFCP_LOG_DEBUG("unit 0x%016Lx is not open -> "
2782 "trying open\n", unit->fcp_lun);
2784 zfcp_erp_unit_strategy_open(erp_action);
2789 case ZFCP_ERP_STEP_UNIT_OPENING:
2790 if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status)) {
2791 ZFCP_LOG_DEBUG("unit 0x%016Lx is open\n",
2793 retval = ZFCP_ERP_SUCCEEDED;
2795 ZFCP_LOG_DEBUG("open failed for unit 0x%016Lx\n",
2797 retval = ZFCP_ERP_FAILED;
2802 debug_text_event(adapter->erp_dbf, 3, "u_ust/ret");
2803 debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof (fcp_lun_t));
2804 debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
2805 debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
2810 zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
2813 struct zfcp_adapter *adapter = unit->port->adapter;
2815 debug_text_event(adapter->erp_dbf, 5, "u_ustclst");
2816 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t));
2818 atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING |
2819 ZFCP_STATUS_COMMON_CLOSING |
2820 ZFCP_STATUS_COMMON_ACCESS_DENIED |
2821 ZFCP_STATUS_UNIT_SHARED |
2822 ZFCP_STATUS_UNIT_READONLY,
2833 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
2834 * ZFCP_ERP_FAILED - action finished unsuccessfully
2837 zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
2840 struct zfcp_adapter *adapter = erp_action->adapter;
2841 struct zfcp_unit *unit = erp_action->unit;
2843 retval = zfcp_fsf_close_unit(erp_action);
2844 if (retval == -ENOMEM) {
2845 debug_text_event(adapter->erp_dbf, 5, "u_ustc_nomem");
2846 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
2847 sizeof (fcp_lun_t));
2848 retval = ZFCP_ERP_NOMEM;
2851 erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
2853 debug_text_event(adapter->erp_dbf, 5, "u_ustc_cuf");
2854 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
2855 sizeof (fcp_lun_t));
2856 /* could not send 'close', fail */
2857 retval = ZFCP_ERP_FAILED;
2860 debug_text_event(adapter->erp_dbf, 6, "u_ustc_cuok");
2861 debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
2862 retval = ZFCP_ERP_CONTINUES;
2873 * returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
2874 * ZFCP_ERP_FAILED - action finished unsuccessfully
2877 zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
2880 struct zfcp_adapter *adapter = erp_action->adapter;
2881 struct zfcp_unit *unit = erp_action->unit;
2883 retval = zfcp_fsf_open_unit(erp_action);
2884 if (retval == -ENOMEM) {
2885 debug_text_event(adapter->erp_dbf, 5, "u_usto_nomem");
2886 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
2887 sizeof (fcp_lun_t));
2888 retval = ZFCP_ERP_NOMEM;
2891 erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
2893 debug_text_event(adapter->erp_dbf, 5, "u_usto_ouf");
2894 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
2895 sizeof (fcp_lun_t));
2896 /* could not send 'open', fail */
2897 retval = ZFCP_ERP_FAILED;
2900 debug_text_event(adapter->erp_dbf, 6, "u_usto_ouok");
2901 debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
2902 retval = ZFCP_ERP_CONTINUES;
2907 void zfcp_erp_start_timer(struct zfcp_fsf_req *fsf_req)
2909 BUG_ON(!fsf_req->erp_action);
2910 fsf_req->timer.function = zfcp_erp_timeout_handler;
2911 fsf_req->timer.data = (unsigned long) fsf_req->erp_action;
2912 fsf_req->timer.expires = jiffies + ZFCP_ERP_FSFREQ_TIMEOUT;
2913 add_timer(&fsf_req->timer);
2919 * purpose: enqueue the specified error recovery action, if needed
2924 zfcp_erp_action_enqueue(int action,
2925 struct zfcp_adapter *adapter,
2926 struct zfcp_port *port, struct zfcp_unit *unit)
2929 struct zfcp_erp_action *erp_action = NULL;
2930 int stronger_action = 0;
2934 * We need some rules here which check whether we really need
2935 * this action or whether we should just drop it.
2936 * E.g. if there is a unfinished 'Reopen Port' request then we drop a
2937 * 'Reopen Unit' request for an associated unit since we can't
2938 * satisfy this request now. A 'Reopen Port' action will trigger
2939 * 'Reopen Unit' actions when it completes.
2940 * Thus, there are only actions in the queue which can immediately be
2941 * executed. This makes the processing of the action queue more
2945 if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
2949 debug_event(adapter->erp_dbf, 4, &action, sizeof (int));
2950 /* check whether we really need this */
2952 case ZFCP_ERP_ACTION_REOPEN_UNIT:
2953 if (atomic_test_mask
2954 (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status)) {
2955 debug_text_event(adapter->erp_dbf, 4, "u_actenq_drp");
2956 debug_event(adapter->erp_dbf, 4, &port->wwpn,
2958 debug_event(adapter->erp_dbf, 4, &unit->fcp_lun,
2959 sizeof (fcp_lun_t));
2962 if (!atomic_test_mask
2963 (ZFCP_STATUS_COMMON_RUNNING, &port->status) ||
2965 (ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
2968 if (!atomic_test_mask
2969 (ZFCP_STATUS_COMMON_UNBLOCKED, &port->status)) {
2970 stronger_action = ZFCP_ERP_ACTION_REOPEN_PORT;
2973 /* fall through !!! */
2975 case ZFCP_ERP_ACTION_REOPEN_PORT:
2976 if (atomic_test_mask
2977 (ZFCP_STATUS_COMMON_ERP_INUSE, &port->status)) {
2978 debug_text_event(adapter->erp_dbf, 4, "p_actenq_drp");
2979 debug_event(adapter->erp_dbf, 4, &port->wwpn,
2983 /* fall through !!! */
2985 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
2986 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
2988 if (port->erp_action.action !=
2989 ZFCP_ERP_ACTION_REOPEN_PORT_FORCED) {
2990 ZFCP_LOG_INFO("dropped erp action %i (port "
2991 "0x%016Lx, action in use: %i)\n",
2993 port->erp_action.action);
2994 debug_text_event(adapter->erp_dbf, 4,
2997 debug_text_event(adapter->erp_dbf, 4,
2999 debug_event(adapter->erp_dbf, 4, &port->wwpn,
3003 if (!atomic_test_mask
3004 (ZFCP_STATUS_COMMON_RUNNING, &adapter->status) ||
3006 (ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) {
3009 if (!atomic_test_mask
3010 (ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status)) {
3011 stronger_action = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
3014 /* fall through !!! */
3016 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
3017 if (atomic_test_mask
3018 (ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status)) {
3019 debug_text_event(adapter->erp_dbf, 4, "a_actenq_drp");
3025 debug_text_exception(adapter->erp_dbf, 1, "a_actenq_bug");
3026 debug_event(adapter->erp_dbf, 1, &action, sizeof (int));
3027 ZFCP_LOG_NORMAL("bug: unknown erp action requested "
3028 "on adapter %s (action=%d)\n",
3029 zfcp_get_busid_by_adapter(adapter), action);
3033 /* check whether we need something stronger first */
3034 if (stronger_action) {
3035 debug_text_event(adapter->erp_dbf, 4, "a_actenq_str");
3036 debug_event(adapter->erp_dbf, 4, &stronger_action,
3038 ZFCP_LOG_DEBUG("stronger erp action %d needed before "
3039 "erp action %d on adapter %s\n",
3040 stronger_action, action,
3041 zfcp_get_busid_by_adapter(adapter));
3042 action = stronger_action;
3045 /* mark adapter to have some error recovery pending */
3046 atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
3048 /* setup error recovery action */
3051 case ZFCP_ERP_ACTION_REOPEN_UNIT:
3052 zfcp_unit_get(unit);
3053 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
3054 erp_action = &unit->erp_action;
3055 if (!atomic_test_mask
3056 (ZFCP_STATUS_COMMON_RUNNING, &unit->status))
3057 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
3060 case ZFCP_ERP_ACTION_REOPEN_PORT:
3061 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
3062 zfcp_port_get(port);
3063 zfcp_erp_action_dismiss_port(port);
3064 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
3065 erp_action = &port->erp_action;
3066 if (!atomic_test_mask
3067 (ZFCP_STATUS_COMMON_RUNNING, &port->status))
3068 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
3071 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
3072 zfcp_adapter_get(adapter);
3073 zfcp_erp_action_dismiss_adapter(adapter);
3074 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
3075 erp_action = &adapter->erp_action;
3076 if (!atomic_test_mask
3077 (ZFCP_STATUS_COMMON_RUNNING, &adapter->status))
3078 status = ZFCP_STATUS_ERP_CLOSE_ONLY;
3082 debug_text_event(adapter->erp_dbf, 4, "a_actenq");
3084 memset(erp_action, 0, sizeof (struct zfcp_erp_action));
3085 erp_action->adapter = adapter;
3086 erp_action->port = port;
3087 erp_action->unit = unit;
3088 erp_action->action = action;
3089 erp_action->status = status;
3091 ++adapter->erp_total_count;
3093 /* finally put it into 'ready' queue and kick erp thread */
3094 list_add(&erp_action->list, &adapter->erp_ready_head);
3095 up(&adapter->erp_ready_sem);
3102 zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
3105 struct zfcp_adapter *adapter = erp_action->adapter;
3107 --adapter->erp_total_count;
3108 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
3109 --adapter->erp_low_mem_count;
3110 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
3113 debug_text_event(adapter->erp_dbf, 4, "a_actdeq");
3114 debug_event(adapter->erp_dbf, 4, &erp_action->action, sizeof (int));
3115 list_del(&erp_action->list);
3116 switch (erp_action->action) {
3117 case ZFCP_ERP_ACTION_REOPEN_UNIT:
3118 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
3119 &erp_action->unit->status);
3121 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
3122 case ZFCP_ERP_ACTION_REOPEN_PORT:
3123 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
3124 &erp_action->port->status);
3126 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
3127 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
3128 &erp_action->adapter->status);
3138 * zfcp_erp_action_cleanup
3140 * Register unit with scsi stack if appropriate and fix reference counts.
3141 * Note: Temporary units are not registered with scsi stack.
3144 zfcp_erp_action_cleanup(int action, struct zfcp_adapter *adapter,
3145 struct zfcp_port *port, struct zfcp_unit *unit,
3149 case ZFCP_ERP_ACTION_REOPEN_UNIT:
3150 if ((result == ZFCP_ERP_SUCCEEDED)
3151 && (!atomic_test_mask(ZFCP_STATUS_UNIT_TEMPORARY,
3155 atomic_set_mask(ZFCP_STATUS_UNIT_REGISTERED,
3157 if (atomic_test_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING,
3158 &unit->status) == 0)
3159 zfcp_erp_schedule_work(unit);
3161 zfcp_unit_put(unit);
3163 case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
3164 case ZFCP_ERP_ACTION_REOPEN_PORT:
3165 if (atomic_test_mask(ZFCP_STATUS_PORT_NO_WWPN,
3167 zfcp_port_put(port);
3171 if ((result == ZFCP_ERP_SUCCEEDED)
3173 struct fc_rport_identifiers ids;
3174 ids.node_name = port->wwnn;
3175 ids.port_name = port->wwpn;
3176 ids.port_id = port->d_id;
3177 ids.roles = FC_RPORT_ROLE_FCP_TARGET;
3179 fc_remote_port_add(adapter->scsi_host, 0, &ids);
3181 ZFCP_LOG_NORMAL("failed registration of rport"
3182 "(adapter %s, wwpn=0x%016Lx)\n",
3183 zfcp_get_busid_by_port(port),
3186 scsi_target_unblock(&port->rport->dev);
3187 port->rport->maxframe_size = port->maxframe_size;
3188 port->rport->supported_classes =
3189 port->supported_classes;
3192 if ((result != ZFCP_ERP_SUCCEEDED) && port->rport) {
3193 fc_remote_port_delete(port->rport);
3196 zfcp_port_put(port);
3198 case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
3199 if (result != ZFCP_ERP_SUCCEEDED) {
3200 list_for_each_entry(port, &adapter->port_list_head, list)
3202 !atomic_test_mask(ZFCP_STATUS_PORT_WKA,
3204 fc_remote_port_delete(port->rport);
3208 zfcp_adapter_put(adapter);
3216 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
3218 struct zfcp_port *port;
3220 debug_text_event(adapter->erp_dbf, 5, "a_actab");
3221 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status))
3222 zfcp_erp_action_dismiss(&adapter->erp_action);
3224 list_for_each_entry(port, &adapter->port_list_head, list)
3225 zfcp_erp_action_dismiss_port(port);
3228 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
3230 struct zfcp_unit *unit;
3231 struct zfcp_adapter *adapter = port->adapter;
3233 debug_text_event(adapter->erp_dbf, 5, "p_actab");
3234 debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
3235 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status))
3236 zfcp_erp_action_dismiss(&port->erp_action);
3238 list_for_each_entry(unit, &port->unit_list_head, list)
3239 zfcp_erp_action_dismiss_unit(unit);
3242 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
3244 struct zfcp_adapter *adapter = unit->port->adapter;
3246 debug_text_event(adapter->erp_dbf, 5, "u_actab");
3247 debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t));
3248 if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status))
3249 zfcp_erp_action_dismiss(&unit->erp_action);
3252 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
3254 struct zfcp_adapter *adapter = erp_action->adapter;
3256 debug_text_event(adapter->erp_dbf, 6, "a_toru");
3257 debug_event(adapter->erp_dbf, 6, &erp_action->action, sizeof (int));
3258 list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
3261 static void zfcp_erp_action_to_ready(struct zfcp_erp_action *erp_action)
3263 struct zfcp_adapter *adapter = erp_action->adapter;
3265 debug_text_event(adapter->erp_dbf, 6, "a_tore");
3266 debug_event(adapter->erp_dbf, 6, &erp_action->action, sizeof (int));
3267 list_move(&erp_action->list, &erp_action->adapter->erp_ready_head);
3271 zfcp_erp_port_boxed(struct zfcp_port *port)
3273 struct zfcp_adapter *adapter = port->adapter;
3274 unsigned long flags;
3276 debug_text_event(adapter->erp_dbf, 3, "p_access_boxed");
3277 debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof(wwn_t));
3278 read_lock_irqsave(&zfcp_data.config_lock, flags);
3279 zfcp_erp_modify_port_status(port,
3280 ZFCP_STATUS_COMMON_ACCESS_BOXED,
3282 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
3283 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED);
3287 zfcp_erp_unit_boxed(struct zfcp_unit *unit)
3289 struct zfcp_adapter *adapter = unit->port->adapter;
3291 debug_text_event(adapter->erp_dbf, 3, "u_access_boxed");
3292 debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof(fcp_lun_t));
3293 zfcp_erp_modify_unit_status(unit,
3294 ZFCP_STATUS_COMMON_ACCESS_BOXED,
3296 zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
3300 zfcp_erp_port_access_denied(struct zfcp_port *port)
3302 struct zfcp_adapter *adapter = port->adapter;
3303 unsigned long flags;
3305 debug_text_event(adapter->erp_dbf, 3, "p_access_denied");
3306 debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof(wwn_t));
3307 read_lock_irqsave(&zfcp_data.config_lock, flags);
3308 zfcp_erp_modify_port_status(port,
3309 ZFCP_STATUS_COMMON_ERP_FAILED |
3310 ZFCP_STATUS_COMMON_ACCESS_DENIED,
3312 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
3316 zfcp_erp_unit_access_denied(struct zfcp_unit *unit)
3318 struct zfcp_adapter *adapter = unit->port->adapter;
3320 debug_text_event(adapter->erp_dbf, 3, "u_access_denied");
3321 debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof(fcp_lun_t));
3322 zfcp_erp_modify_unit_status(unit,
3323 ZFCP_STATUS_COMMON_ERP_FAILED |
3324 ZFCP_STATUS_COMMON_ACCESS_DENIED,
3329 zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter)
3331 struct zfcp_port *port;
3332 unsigned long flags;
3334 if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
3337 debug_text_event(adapter->erp_dbf, 3, "a_access_recover");
3338 debug_event(adapter->erp_dbf, 3, zfcp_get_busid_by_adapter(adapter), 8);
3340 read_lock_irqsave(&zfcp_data.config_lock, flags);
3341 if (adapter->nameserver_port)
3342 zfcp_erp_port_access_changed(adapter->nameserver_port);
3343 list_for_each_entry(port, &adapter->port_list_head, list)
3344 if (port != adapter->nameserver_port)
3345 zfcp_erp_port_access_changed(port);
3346 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
3350 zfcp_erp_port_access_changed(struct zfcp_port *port)
3352 struct zfcp_adapter *adapter = port->adapter;
3353 struct zfcp_unit *unit;
3355 debug_text_event(adapter->erp_dbf, 3, "p_access_recover");
3356 debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof(wwn_t));
3358 if (!atomic_test_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED,
3360 !atomic_test_mask(ZFCP_STATUS_COMMON_ACCESS_BOXED,
3362 if (!atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
3363 list_for_each_entry(unit, &port->unit_list_head, list)
3364 zfcp_erp_unit_access_changed(unit);
3368 ZFCP_LOG_NORMAL("reopen of port 0x%016Lx on adapter %s "
3369 "(due to ACT update)\n",
3370 port->wwpn, zfcp_get_busid_by_adapter(adapter));
3371 if (zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
3372 ZFCP_LOG_NORMAL("failed reopen of port"
3373 "(adapter %s, wwpn=0x%016Lx)\n",
3374 zfcp_get_busid_by_adapter(adapter), port->wwpn);
3378 zfcp_erp_unit_access_changed(struct zfcp_unit *unit)
3380 struct zfcp_adapter *adapter = unit->port->adapter;
3382 debug_text_event(adapter->erp_dbf, 3, "u_access_recover");
3383 debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof(fcp_lun_t));
3385 if (!atomic_test_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED,
3387 !atomic_test_mask(ZFCP_STATUS_COMMON_ACCESS_BOXED,
3391 ZFCP_LOG_NORMAL("reopen of unit 0x%016Lx on port 0x%016Lx "
3392 " on adapter %s (due to ACT update)\n",
3393 unit->fcp_lun, unit->port->wwpn,
3394 zfcp_get_busid_by_adapter(adapter));
3395 if (zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
3396 ZFCP_LOG_NORMAL("failed reopen of unit (adapter %s, "
3397 "wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
3398 zfcp_get_busid_by_adapter(adapter),
3399 unit->port->wwpn, unit->fcp_lun);
3402 #undef ZFCP_LOG_AREA