This source file includes following definitions.
- _find_server
- _find_lcu
- _find_group
- _allocate_server
- _free_server
- _allocate_lcu
- _free_lcu
- dasd_alias_make_device_known_to_lcu
- dasd_alias_disconnect_device_from_lcu
- _add_device_to_lcu
- _remove_device_from_lcu
- suborder_not_supported
- read_unit_address_configuration
- _lcu_update
- lcu_update_work
- _schedule_lcu_update
- dasd_alias_add_device
- dasd_alias_update_add_device
- dasd_alias_remove_device
- dasd_alias_get_start_dev
- reset_summary_unit_check
- _restart_all_base_devices_on_lcu
- flush_all_alias_devices_on_lcu
- _stop_all_devices_on_lcu
- _unstop_all_devices_on_lcu
- summary_unit_check_handling_work
- dasd_alias_handle_summary_unit_check
1
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7
8
9 #define KMSG_COMPONENT "dasd-eckd"
10
11 #include <linux/list.h>
12 #include <linux/slab.h>
13 #include <asm/ebcdic.h>
14 #include "dasd_int.h"
15 #include "dasd_eckd.h"
16
17 #ifdef PRINTK_HEADER
18 #undef PRINTK_HEADER
19 #endif
20 #define PRINTK_HEADER "dasd(eckd):"
21
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43
44 static void summary_unit_check_handling_work(struct work_struct *);
45 static void lcu_update_work(struct work_struct *);
46 static int _schedule_lcu_update(struct alias_lcu *, struct dasd_device *);
47
48 static struct alias_root aliastree = {
49 .serverlist = LIST_HEAD_INIT(aliastree.serverlist),
50 .lock = __SPIN_LOCK_UNLOCKED(aliastree.lock),
51 };
52
53 static struct alias_server *_find_server(struct dasd_uid *uid)
54 {
55 struct alias_server *pos;
56 list_for_each_entry(pos, &aliastree.serverlist, server) {
57 if (!strncmp(pos->uid.vendor, uid->vendor,
58 sizeof(uid->vendor))
59 && !strncmp(pos->uid.serial, uid->serial,
60 sizeof(uid->serial)))
61 return pos;
62 }
63 return NULL;
64 }
65
66 static struct alias_lcu *_find_lcu(struct alias_server *server,
67 struct dasd_uid *uid)
68 {
69 struct alias_lcu *pos;
70 list_for_each_entry(pos, &server->lculist, lcu) {
71 if (pos->uid.ssid == uid->ssid)
72 return pos;
73 }
74 return NULL;
75 }
76
77 static struct alias_pav_group *_find_group(struct alias_lcu *lcu,
78 struct dasd_uid *uid)
79 {
80 struct alias_pav_group *pos;
81 __u8 search_unit_addr;
82
83
84 if (lcu->pav == HYPER_PAV) {
85 if (list_empty(&lcu->grouplist))
86 return NULL;
87 else
88 return list_first_entry(&lcu->grouplist,
89 struct alias_pav_group, group);
90 }
91
92
93 if (uid->type == UA_BASE_DEVICE)
94 search_unit_addr = uid->real_unit_addr;
95 else
96 search_unit_addr = uid->base_unit_addr;
97 list_for_each_entry(pos, &lcu->grouplist, group) {
98 if (pos->uid.base_unit_addr == search_unit_addr &&
99 !strncmp(pos->uid.vduit, uid->vduit, sizeof(uid->vduit)))
100 return pos;
101 }
102 return NULL;
103 }
104
105 static struct alias_server *_allocate_server(struct dasd_uid *uid)
106 {
107 struct alias_server *server;
108
109 server = kzalloc(sizeof(*server), GFP_KERNEL);
110 if (!server)
111 return ERR_PTR(-ENOMEM);
112 memcpy(server->uid.vendor, uid->vendor, sizeof(uid->vendor));
113 memcpy(server->uid.serial, uid->serial, sizeof(uid->serial));
114 INIT_LIST_HEAD(&server->server);
115 INIT_LIST_HEAD(&server->lculist);
116 return server;
117 }
118
119 static void _free_server(struct alias_server *server)
120 {
121 kfree(server);
122 }
123
124 static struct alias_lcu *_allocate_lcu(struct dasd_uid *uid)
125 {
126 struct alias_lcu *lcu;
127
128 lcu = kzalloc(sizeof(*lcu), GFP_KERNEL);
129 if (!lcu)
130 return ERR_PTR(-ENOMEM);
131 lcu->uac = kzalloc(sizeof(*(lcu->uac)), GFP_KERNEL | GFP_DMA);
132 if (!lcu->uac)
133 goto out_err1;
134 lcu->rsu_cqr = kzalloc(sizeof(*lcu->rsu_cqr), GFP_KERNEL | GFP_DMA);
135 if (!lcu->rsu_cqr)
136 goto out_err2;
137 lcu->rsu_cqr->cpaddr = kzalloc(sizeof(struct ccw1),
138 GFP_KERNEL | GFP_DMA);
139 if (!lcu->rsu_cqr->cpaddr)
140 goto out_err3;
141 lcu->rsu_cqr->data = kzalloc(16, GFP_KERNEL | GFP_DMA);
142 if (!lcu->rsu_cqr->data)
143 goto out_err4;
144
145 memcpy(lcu->uid.vendor, uid->vendor, sizeof(uid->vendor));
146 memcpy(lcu->uid.serial, uid->serial, sizeof(uid->serial));
147 lcu->uid.ssid = uid->ssid;
148 lcu->pav = NO_PAV;
149 lcu->flags = NEED_UAC_UPDATE | UPDATE_PENDING;
150 INIT_LIST_HEAD(&lcu->lcu);
151 INIT_LIST_HEAD(&lcu->inactive_devices);
152 INIT_LIST_HEAD(&lcu->active_devices);
153 INIT_LIST_HEAD(&lcu->grouplist);
154 INIT_WORK(&lcu->suc_data.worker, summary_unit_check_handling_work);
155 INIT_DELAYED_WORK(&lcu->ruac_data.dwork, lcu_update_work);
156 spin_lock_init(&lcu->lock);
157 init_completion(&lcu->lcu_setup);
158 return lcu;
159
160 out_err4:
161 kfree(lcu->rsu_cqr->cpaddr);
162 out_err3:
163 kfree(lcu->rsu_cqr);
164 out_err2:
165 kfree(lcu->uac);
166 out_err1:
167 kfree(lcu);
168 return ERR_PTR(-ENOMEM);
169 }
170
171 static void _free_lcu(struct alias_lcu *lcu)
172 {
173 kfree(lcu->rsu_cqr->data);
174 kfree(lcu->rsu_cqr->cpaddr);
175 kfree(lcu->rsu_cqr);
176 kfree(lcu->uac);
177 kfree(lcu);
178 }
179
180
181
182
183
184
185
186
187 int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)
188 {
189 struct dasd_eckd_private *private = device->private;
190 unsigned long flags;
191 struct alias_server *server, *newserver;
192 struct alias_lcu *lcu, *newlcu;
193 struct dasd_uid uid;
194
195 device->discipline->get_uid(device, &uid);
196 spin_lock_irqsave(&aliastree.lock, flags);
197 server = _find_server(&uid);
198 if (!server) {
199 spin_unlock_irqrestore(&aliastree.lock, flags);
200 newserver = _allocate_server(&uid);
201 if (IS_ERR(newserver))
202 return PTR_ERR(newserver);
203 spin_lock_irqsave(&aliastree.lock, flags);
204 server = _find_server(&uid);
205 if (!server) {
206 list_add(&newserver->server, &aliastree.serverlist);
207 server = newserver;
208 } else {
209
210 _free_server(newserver);
211 }
212 }
213
214 lcu = _find_lcu(server, &uid);
215 if (!lcu) {
216 spin_unlock_irqrestore(&aliastree.lock, flags);
217 newlcu = _allocate_lcu(&uid);
218 if (IS_ERR(newlcu))
219 return PTR_ERR(newlcu);
220 spin_lock_irqsave(&aliastree.lock, flags);
221 lcu = _find_lcu(server, &uid);
222 if (!lcu) {
223 list_add(&newlcu->lcu, &server->lculist);
224 lcu = newlcu;
225 } else {
226
227 _free_lcu(newlcu);
228 }
229 }
230 spin_lock(&lcu->lock);
231 list_add(&device->alias_list, &lcu->inactive_devices);
232 private->lcu = lcu;
233 spin_unlock(&lcu->lock);
234 spin_unlock_irqrestore(&aliastree.lock, flags);
235
236 return 0;
237 }
238
239
240
241
242
243
244 void dasd_alias_disconnect_device_from_lcu(struct dasd_device *device)
245 {
246 struct dasd_eckd_private *private = device->private;
247 unsigned long flags;
248 struct alias_lcu *lcu;
249 struct alias_server *server;
250 int was_pending;
251 struct dasd_uid uid;
252
253 lcu = private->lcu;
254
255 if (!lcu)
256 return;
257 device->discipline->get_uid(device, &uid);
258 spin_lock_irqsave(&lcu->lock, flags);
259 list_del_init(&device->alias_list);
260
261 if (device == lcu->suc_data.device) {
262 spin_unlock_irqrestore(&lcu->lock, flags);
263 cancel_work_sync(&lcu->suc_data.worker);
264 spin_lock_irqsave(&lcu->lock, flags);
265 if (device == lcu->suc_data.device) {
266 dasd_put_device(device);
267 lcu->suc_data.device = NULL;
268 }
269 }
270 was_pending = 0;
271 if (device == lcu->ruac_data.device) {
272 spin_unlock_irqrestore(&lcu->lock, flags);
273 was_pending = 1;
274 cancel_delayed_work_sync(&lcu->ruac_data.dwork);
275 spin_lock_irqsave(&lcu->lock, flags);
276 if (device == lcu->ruac_data.device) {
277 dasd_put_device(device);
278 lcu->ruac_data.device = NULL;
279 }
280 }
281 private->lcu = NULL;
282 spin_unlock_irqrestore(&lcu->lock, flags);
283
284 spin_lock_irqsave(&aliastree.lock, flags);
285 spin_lock(&lcu->lock);
286 if (list_empty(&lcu->grouplist) &&
287 list_empty(&lcu->active_devices) &&
288 list_empty(&lcu->inactive_devices)) {
289 list_del(&lcu->lcu);
290 spin_unlock(&lcu->lock);
291 _free_lcu(lcu);
292 lcu = NULL;
293 } else {
294 if (was_pending)
295 _schedule_lcu_update(lcu, NULL);
296 spin_unlock(&lcu->lock);
297 }
298 server = _find_server(&uid);
299 if (server && list_empty(&server->lculist)) {
300 list_del(&server->server);
301 _free_server(server);
302 }
303 spin_unlock_irqrestore(&aliastree.lock, flags);
304 }
305
306
307
308
309
310
311
312 static int _add_device_to_lcu(struct alias_lcu *lcu,
313 struct dasd_device *device,
314 struct dasd_device *pos)
315 {
316
317 struct dasd_eckd_private *private = device->private;
318 struct alias_pav_group *group;
319 struct dasd_uid uid;
320
321 spin_lock(get_ccwdev_lock(device->cdev));
322 private->uid.type = lcu->uac->unit[private->uid.real_unit_addr].ua_type;
323 private->uid.base_unit_addr =
324 lcu->uac->unit[private->uid.real_unit_addr].base_ua;
325 uid = private->uid;
326 spin_unlock(get_ccwdev_lock(device->cdev));
327
328 if (lcu->pav == NO_PAV) {
329 list_move(&device->alias_list, &lcu->active_devices);
330 return 0;
331 }
332 group = _find_group(lcu, &uid);
333 if (!group) {
334 group = kzalloc(sizeof(*group), GFP_ATOMIC);
335 if (!group)
336 return -ENOMEM;
337 memcpy(group->uid.vendor, uid.vendor, sizeof(uid.vendor));
338 memcpy(group->uid.serial, uid.serial, sizeof(uid.serial));
339 group->uid.ssid = uid.ssid;
340 if (uid.type == UA_BASE_DEVICE)
341 group->uid.base_unit_addr = uid.real_unit_addr;
342 else
343 group->uid.base_unit_addr = uid.base_unit_addr;
344 memcpy(group->uid.vduit, uid.vduit, sizeof(uid.vduit));
345 INIT_LIST_HEAD(&group->group);
346 INIT_LIST_HEAD(&group->baselist);
347 INIT_LIST_HEAD(&group->aliaslist);
348 list_add(&group->group, &lcu->grouplist);
349 }
350 if (uid.type == UA_BASE_DEVICE)
351 list_move(&device->alias_list, &group->baselist);
352 else
353 list_move(&device->alias_list, &group->aliaslist);
354 private->pavgroup = group;
355 return 0;
356 };
357
358 static void _remove_device_from_lcu(struct alias_lcu *lcu,
359 struct dasd_device *device)
360 {
361 struct dasd_eckd_private *private = device->private;
362 struct alias_pav_group *group;
363
364 list_move(&device->alias_list, &lcu->inactive_devices);
365 group = private->pavgroup;
366 if (!group)
367 return;
368 private->pavgroup = NULL;
369 if (list_empty(&group->baselist) && list_empty(&group->aliaslist)) {
370 list_del(&group->group);
371 kfree(group);
372 return;
373 }
374 if (group->next == device)
375 group->next = NULL;
376 };
377
378 static int
379 suborder_not_supported(struct dasd_ccw_req *cqr)
380 {
381 char *sense;
382 char reason;
383 char msg_format;
384 char msg_no;
385
386
387
388
389
390
391 if (cqr->intrc == -ENODEV)
392 return 1;
393
394 if (cqr->intrc == -ENOLINK)
395 return 1;
396
397 if (cqr->intrc == -EPERM)
398 return 1;
399
400 sense = dasd_get_sense(&cqr->irb);
401 if (!sense)
402 return 0;
403
404 reason = sense[0];
405 msg_format = (sense[7] & 0xF0);
406 msg_no = (sense[7] & 0x0F);
407
408
409 if ((reason == 0x80) && (msg_format == 0x00) && (msg_no == 0x04))
410 return 1;
411
412 return 0;
413 }
414
415 static int read_unit_address_configuration(struct dasd_device *device,
416 struct alias_lcu *lcu)
417 {
418 struct dasd_psf_prssd_data *prssdp;
419 struct dasd_ccw_req *cqr;
420 struct ccw1 *ccw;
421 int rc;
422 unsigned long flags;
423
424 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 + 1 ,
425 (sizeof(struct dasd_psf_prssd_data)),
426 device, NULL);
427 if (IS_ERR(cqr))
428 return PTR_ERR(cqr);
429 cqr->startdev = device;
430 cqr->memdev = device;
431 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
432 cqr->retries = 10;
433 cqr->expires = 20 * HZ;
434
435
436 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
437 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
438 prssdp->order = PSF_ORDER_PRSSD;
439 prssdp->suborder = 0x0e;
440
441
442 ccw = cqr->cpaddr;
443 ccw->cmd_code = DASD_ECKD_CCW_PSF;
444 ccw->count = sizeof(struct dasd_psf_prssd_data);
445 ccw->flags |= CCW_FLAG_CC;
446 ccw->cda = (__u32)(addr_t) prssdp;
447
448
449 memset(lcu->uac, 0, sizeof(*(lcu->uac)));
450
451 ccw++;
452 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
453 ccw->count = sizeof(*(lcu->uac));
454 ccw->cda = (__u32)(addr_t) lcu->uac;
455
456 cqr->buildclk = get_tod_clock();
457 cqr->status = DASD_CQR_FILLED;
458
459
460 spin_lock_irqsave(&lcu->lock, flags);
461 lcu->flags &= ~NEED_UAC_UPDATE;
462 spin_unlock_irqrestore(&lcu->lock, flags);
463
464 rc = dasd_sleep_on(cqr);
465 if (rc && !suborder_not_supported(cqr)) {
466 spin_lock_irqsave(&lcu->lock, flags);
467 lcu->flags |= NEED_UAC_UPDATE;
468 spin_unlock_irqrestore(&lcu->lock, flags);
469 }
470 dasd_sfree_request(cqr, cqr->memdev);
471 return rc;
472 }
473
474 static int _lcu_update(struct dasd_device *refdev, struct alias_lcu *lcu)
475 {
476 unsigned long flags;
477 struct alias_pav_group *pavgroup, *tempgroup;
478 struct dasd_device *device, *tempdev;
479 int i, rc;
480 struct dasd_eckd_private *private;
481
482 spin_lock_irqsave(&lcu->lock, flags);
483 list_for_each_entry_safe(pavgroup, tempgroup, &lcu->grouplist, group) {
484 list_for_each_entry_safe(device, tempdev, &pavgroup->baselist,
485 alias_list) {
486 list_move(&device->alias_list, &lcu->active_devices);
487 private = device->private;
488 private->pavgroup = NULL;
489 }
490 list_for_each_entry_safe(device, tempdev, &pavgroup->aliaslist,
491 alias_list) {
492 list_move(&device->alias_list, &lcu->active_devices);
493 private = device->private;
494 private->pavgroup = NULL;
495 }
496 list_del(&pavgroup->group);
497 kfree(pavgroup);
498 }
499 spin_unlock_irqrestore(&lcu->lock, flags);
500
501 rc = read_unit_address_configuration(refdev, lcu);
502 if (rc)
503 return rc;
504
505 spin_lock_irqsave(&lcu->lock, flags);
506 lcu->pav = NO_PAV;
507 for (i = 0; i < MAX_DEVICES_PER_LCU; ++i) {
508 switch (lcu->uac->unit[i].ua_type) {
509 case UA_BASE_PAV_ALIAS:
510 lcu->pav = BASE_PAV;
511 break;
512 case UA_HYPER_PAV_ALIAS:
513 lcu->pav = HYPER_PAV;
514 break;
515 }
516 if (lcu->pav != NO_PAV)
517 break;
518 }
519
520 list_for_each_entry_safe(device, tempdev, &lcu->active_devices,
521 alias_list) {
522 _add_device_to_lcu(lcu, device, refdev);
523 }
524 spin_unlock_irqrestore(&lcu->lock, flags);
525 return 0;
526 }
527
528 static void lcu_update_work(struct work_struct *work)
529 {
530 struct alias_lcu *lcu;
531 struct read_uac_work_data *ruac_data;
532 struct dasd_device *device;
533 unsigned long flags;
534 int rc;
535
536 ruac_data = container_of(work, struct read_uac_work_data, dwork.work);
537 lcu = container_of(ruac_data, struct alias_lcu, ruac_data);
538 device = ruac_data->device;
539 rc = _lcu_update(device, lcu);
540
541
542
543
544
545 spin_lock_irqsave(&lcu->lock, flags);
546 if ((rc && (rc != -EOPNOTSUPP)) || (lcu->flags & NEED_UAC_UPDATE)) {
547 DBF_DEV_EVENT(DBF_WARNING, device, "could not update"
548 " alias data in lcu (rc = %d), retry later", rc);
549 if (!schedule_delayed_work(&lcu->ruac_data.dwork, 30*HZ))
550 dasd_put_device(device);
551 } else {
552 dasd_put_device(device);
553 lcu->ruac_data.device = NULL;
554 lcu->flags &= ~UPDATE_PENDING;
555 }
556 spin_unlock_irqrestore(&lcu->lock, flags);
557 }
558
559 static int _schedule_lcu_update(struct alias_lcu *lcu,
560 struct dasd_device *device)
561 {
562 struct dasd_device *usedev = NULL;
563 struct alias_pav_group *group;
564
565 lcu->flags |= NEED_UAC_UPDATE;
566 if (lcu->ruac_data.device) {
567
568 return 0;
569 }
570 if (device && !list_empty(&device->alias_list))
571 usedev = device;
572
573 if (!usedev && !list_empty(&lcu->grouplist)) {
574 group = list_first_entry(&lcu->grouplist,
575 struct alias_pav_group, group);
576 if (!list_empty(&group->baselist))
577 usedev = list_first_entry(&group->baselist,
578 struct dasd_device,
579 alias_list);
580 else if (!list_empty(&group->aliaslist))
581 usedev = list_first_entry(&group->aliaslist,
582 struct dasd_device,
583 alias_list);
584 }
585 if (!usedev && !list_empty(&lcu->active_devices)) {
586 usedev = list_first_entry(&lcu->active_devices,
587 struct dasd_device, alias_list);
588 }
589
590
591
592
593 if (!usedev)
594 return -EINVAL;
595 dasd_get_device(usedev);
596 lcu->ruac_data.device = usedev;
597 if (!schedule_delayed_work(&lcu->ruac_data.dwork, 0))
598 dasd_put_device(usedev);
599 return 0;
600 }
601
602 int dasd_alias_add_device(struct dasd_device *device)
603 {
604 struct dasd_eckd_private *private = device->private;
605 __u8 uaddr = private->uid.real_unit_addr;
606 struct alias_lcu *lcu = private->lcu;
607 unsigned long flags;
608 int rc;
609
610 rc = 0;
611 spin_lock_irqsave(&lcu->lock, flags);
612
613
614
615
616 if (private->uid.type != lcu->uac->unit[uaddr].ua_type) {
617 lcu->flags |= UPDATE_PENDING;
618 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
619 "uid type mismatch - trigger rescan");
620 }
621 if (!(lcu->flags & UPDATE_PENDING)) {
622 rc = _add_device_to_lcu(lcu, device, device);
623 if (rc)
624 lcu->flags |= UPDATE_PENDING;
625 }
626 if (lcu->flags & UPDATE_PENDING) {
627 list_move(&device->alias_list, &lcu->active_devices);
628 _schedule_lcu_update(lcu, device);
629 }
630 spin_unlock_irqrestore(&lcu->lock, flags);
631 return rc;
632 }
633
634 int dasd_alias_update_add_device(struct dasd_device *device)
635 {
636 struct dasd_eckd_private *private = device->private;
637
638 private->lcu->flags |= UPDATE_PENDING;
639 return dasd_alias_add_device(device);
640 }
641
642 int dasd_alias_remove_device(struct dasd_device *device)
643 {
644 struct dasd_eckd_private *private = device->private;
645 struct alias_lcu *lcu = private->lcu;
646 unsigned long flags;
647
648
649 if (!lcu)
650 return 0;
651 spin_lock_irqsave(&lcu->lock, flags);
652 _remove_device_from_lcu(lcu, device);
653 spin_unlock_irqrestore(&lcu->lock, flags);
654 return 0;
655 }
656
657 struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *base_device)
658 {
659 struct dasd_eckd_private *alias_priv, *private = base_device->private;
660 struct alias_pav_group *group = private->pavgroup;
661 struct alias_lcu *lcu = private->lcu;
662 struct dasd_device *alias_device;
663 unsigned long flags;
664
665 if (!group || !lcu)
666 return NULL;
667 if (lcu->pav == NO_PAV ||
668 lcu->flags & (NEED_UAC_UPDATE | UPDATE_PENDING))
669 return NULL;
670 if (unlikely(!(private->features.feature[8] & 0x01))) {
671
672
673
674
675
676 DBF_DEV_EVENT(DBF_ERR, base_device, "%s",
677 "Prefix not enabled with PAV enabled\n");
678 return NULL;
679 }
680
681 spin_lock_irqsave(&lcu->lock, flags);
682 alias_device = group->next;
683 if (!alias_device) {
684 if (list_empty(&group->aliaslist)) {
685 spin_unlock_irqrestore(&lcu->lock, flags);
686 return NULL;
687 } else {
688 alias_device = list_first_entry(&group->aliaslist,
689 struct dasd_device,
690 alias_list);
691 }
692 }
693 if (list_is_last(&alias_device->alias_list, &group->aliaslist))
694 group->next = list_first_entry(&group->aliaslist,
695 struct dasd_device, alias_list);
696 else
697 group->next = list_first_entry(&alias_device->alias_list,
698 struct dasd_device, alias_list);
699 spin_unlock_irqrestore(&lcu->lock, flags);
700 alias_priv = alias_device->private;
701 if ((alias_priv->count < private->count) && !alias_device->stopped &&
702 !test_bit(DASD_FLAG_OFFLINE, &alias_device->flags))
703 return alias_device;
704 else
705 return NULL;
706 }
707
708
709
710
711
712 static int reset_summary_unit_check(struct alias_lcu *lcu,
713 struct dasd_device *device,
714 char reason)
715 {
716 struct dasd_ccw_req *cqr;
717 int rc = 0;
718 struct ccw1 *ccw;
719
720 cqr = lcu->rsu_cqr;
721 memcpy((char *) &cqr->magic, "ECKD", 4);
722 ASCEBC((char *) &cqr->magic, 4);
723 ccw = cqr->cpaddr;
724 ccw->cmd_code = DASD_ECKD_CCW_RSCK;
725 ccw->flags = CCW_FLAG_SLI;
726 ccw->count = 16;
727 ccw->cda = (__u32)(addr_t) cqr->data;
728 ((char *)cqr->data)[0] = reason;
729
730 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
731 cqr->retries = 255;
732 cqr->startdev = device;
733 cqr->memdev = device;
734 cqr->block = NULL;
735 cqr->expires = 5 * HZ;
736 cqr->buildclk = get_tod_clock();
737 cqr->status = DASD_CQR_FILLED;
738
739 rc = dasd_sleep_on_immediatly(cqr);
740 return rc;
741 }
742
743 static void _restart_all_base_devices_on_lcu(struct alias_lcu *lcu)
744 {
745 struct alias_pav_group *pavgroup;
746 struct dasd_device *device;
747 struct dasd_eckd_private *private;
748
749
750 list_for_each_entry(device, &lcu->active_devices, alias_list) {
751 private = device->private;
752 if (private->uid.type != UA_BASE_DEVICE)
753 continue;
754 dasd_schedule_block_bh(device->block);
755 dasd_schedule_device_bh(device);
756 }
757 list_for_each_entry(device, &lcu->inactive_devices, alias_list) {
758 private = device->private;
759 if (private->uid.type != UA_BASE_DEVICE)
760 continue;
761 dasd_schedule_block_bh(device->block);
762 dasd_schedule_device_bh(device);
763 }
764 list_for_each_entry(pavgroup, &lcu->grouplist, group) {
765 list_for_each_entry(device, &pavgroup->baselist, alias_list) {
766 dasd_schedule_block_bh(device->block);
767 dasd_schedule_device_bh(device);
768 }
769 }
770 }
771
772 static void flush_all_alias_devices_on_lcu(struct alias_lcu *lcu)
773 {
774 struct alias_pav_group *pavgroup;
775 struct dasd_device *device, *temp;
776 struct dasd_eckd_private *private;
777 unsigned long flags;
778 LIST_HEAD(active);
779
780
781
782
783
784
785
786
787
788
789
790
791 spin_lock_irqsave(&lcu->lock, flags);
792 list_for_each_entry_safe(device, temp, &lcu->active_devices,
793 alias_list) {
794 private = device->private;
795 if (private->uid.type == UA_BASE_DEVICE)
796 continue;
797 list_move(&device->alias_list, &active);
798 }
799
800 list_for_each_entry(pavgroup, &lcu->grouplist, group) {
801 list_splice_init(&pavgroup->aliaslist, &active);
802 }
803 while (!list_empty(&active)) {
804 device = list_first_entry(&active, struct dasd_device,
805 alias_list);
806 spin_unlock_irqrestore(&lcu->lock, flags);
807 dasd_flush_device_queue(device);
808 spin_lock_irqsave(&lcu->lock, flags);
809
810
811
812
813 if (device == list_first_entry(&active,
814 struct dasd_device, alias_list)) {
815 list_move(&device->alias_list, &lcu->active_devices);
816 private = device->private;
817 private->pavgroup = NULL;
818 }
819 }
820 spin_unlock_irqrestore(&lcu->lock, flags);
821 }
822
823 static void _stop_all_devices_on_lcu(struct alias_lcu *lcu)
824 {
825 struct alias_pav_group *pavgroup;
826 struct dasd_device *device;
827
828 list_for_each_entry(device, &lcu->active_devices, alias_list) {
829 spin_lock(get_ccwdev_lock(device->cdev));
830 dasd_device_set_stop_bits(device, DASD_STOPPED_SU);
831 spin_unlock(get_ccwdev_lock(device->cdev));
832 }
833 list_for_each_entry(device, &lcu->inactive_devices, alias_list) {
834 spin_lock(get_ccwdev_lock(device->cdev));
835 dasd_device_set_stop_bits(device, DASD_STOPPED_SU);
836 spin_unlock(get_ccwdev_lock(device->cdev));
837 }
838 list_for_each_entry(pavgroup, &lcu->grouplist, group) {
839 list_for_each_entry(device, &pavgroup->baselist, alias_list) {
840 spin_lock(get_ccwdev_lock(device->cdev));
841 dasd_device_set_stop_bits(device, DASD_STOPPED_SU);
842 spin_unlock(get_ccwdev_lock(device->cdev));
843 }
844 list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {
845 spin_lock(get_ccwdev_lock(device->cdev));
846 dasd_device_set_stop_bits(device, DASD_STOPPED_SU);
847 spin_unlock(get_ccwdev_lock(device->cdev));
848 }
849 }
850 }
851
852 static void _unstop_all_devices_on_lcu(struct alias_lcu *lcu)
853 {
854 struct alias_pav_group *pavgroup;
855 struct dasd_device *device;
856
857 list_for_each_entry(device, &lcu->active_devices, alias_list) {
858 spin_lock(get_ccwdev_lock(device->cdev));
859 dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
860 spin_unlock(get_ccwdev_lock(device->cdev));
861 }
862 list_for_each_entry(device, &lcu->inactive_devices, alias_list) {
863 spin_lock(get_ccwdev_lock(device->cdev));
864 dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
865 spin_unlock(get_ccwdev_lock(device->cdev));
866 }
867 list_for_each_entry(pavgroup, &lcu->grouplist, group) {
868 list_for_each_entry(device, &pavgroup->baselist, alias_list) {
869 spin_lock(get_ccwdev_lock(device->cdev));
870 dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
871 spin_unlock(get_ccwdev_lock(device->cdev));
872 }
873 list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {
874 spin_lock(get_ccwdev_lock(device->cdev));
875 dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
876 spin_unlock(get_ccwdev_lock(device->cdev));
877 }
878 }
879 }
880
881 static void summary_unit_check_handling_work(struct work_struct *work)
882 {
883 struct alias_lcu *lcu;
884 struct summary_unit_check_work_data *suc_data;
885 unsigned long flags;
886 struct dasd_device *device;
887
888 suc_data = container_of(work, struct summary_unit_check_work_data,
889 worker);
890 lcu = container_of(suc_data, struct alias_lcu, suc_data);
891 device = suc_data->device;
892
893
894 flush_all_alias_devices_on_lcu(lcu);
895
896
897 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
898 dasd_device_remove_stop_bits(device,
899 (DASD_STOPPED_SU | DASD_STOPPED_PENDING));
900 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
901 reset_summary_unit_check(lcu, device, suc_data->reason);
902
903 spin_lock_irqsave(&lcu->lock, flags);
904 _unstop_all_devices_on_lcu(lcu);
905 _restart_all_base_devices_on_lcu(lcu);
906
907 _schedule_lcu_update(lcu, device);
908 lcu->suc_data.device = NULL;
909 dasd_put_device(device);
910 spin_unlock_irqrestore(&lcu->lock, flags);
911 }
912
913 void dasd_alias_handle_summary_unit_check(struct work_struct *work)
914 {
915 struct dasd_device *device = container_of(work, struct dasd_device,
916 suc_work);
917 struct dasd_eckd_private *private = device->private;
918 struct alias_lcu *lcu;
919 unsigned long flags;
920
921 lcu = private->lcu;
922 if (!lcu) {
923 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
924 "device not ready to handle summary"
925 " unit check (no lcu structure)");
926 goto out;
927 }
928 spin_lock_irqsave(&lcu->lock, flags);
929
930
931
932 if (list_empty(&device->alias_list)) {
933 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
934 "device is in offline processing,"
935 " don't do summary unit check handling");
936 goto out_unlock;
937 }
938 if (lcu->suc_data.device) {
939
940 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
941 "previous instance of summary unit check worker"
942 " still pending");
943 goto out_unlock;
944 }
945 _stop_all_devices_on_lcu(lcu);
946
947 lcu->flags |= NEED_UAC_UPDATE | UPDATE_PENDING;
948 lcu->suc_data.reason = private->suc_reason;
949 lcu->suc_data.device = device;
950 dasd_get_device(device);
951 if (!schedule_work(&lcu->suc_data.worker))
952 dasd_put_device(device);
953 out_unlock:
954 spin_unlock_irqrestore(&lcu->lock, flags);
955 out:
956 clear_bit(DASD_FLAG_SUC, &device->flags);
957 dasd_put_device(device);
958 };