1
2
3
4
5
6
7
8#define KMSG_COMPONENT "dasd-eckd"
9
10#include <linux/list.h>
11#include <linux/slab.h>
12#include <asm/ebcdic.h>
13#include "dasd_int.h"
14#include "dasd_eckd.h"
15
16#ifdef PRINTK_HEADER
17#undef PRINTK_HEADER
18#endif
19#define PRINTK_HEADER "dasd(eckd):"
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43static void summary_unit_check_handling_work(struct work_struct *);
44static void lcu_update_work(struct work_struct *);
45static int _schedule_lcu_update(struct alias_lcu *, struct dasd_device *);
46
47static struct alias_root aliastree = {
48 .serverlist = LIST_HEAD_INIT(aliastree.serverlist),
49 .lock = __SPIN_LOCK_UNLOCKED(aliastree.lock),
50};
51
52static struct alias_server *_find_server(struct dasd_uid *uid)
53{
54 struct alias_server *pos;
55 list_for_each_entry(pos, &aliastree.serverlist, server) {
56 if (!strncmp(pos->uid.vendor, uid->vendor,
57 sizeof(uid->vendor))
58 && !strncmp(pos->uid.serial, uid->serial,
59 sizeof(uid->serial)))
60 return pos;
61 };
62 return NULL;
63}
64
65static struct alias_lcu *_find_lcu(struct alias_server *server,
66 struct dasd_uid *uid)
67{
68 struct alias_lcu *pos;
69 list_for_each_entry(pos, &server->lculist, lcu) {
70 if (pos->uid.ssid == uid->ssid)
71 return pos;
72 };
73 return NULL;
74}
75
76static struct alias_pav_group *_find_group(struct alias_lcu *lcu,
77 struct dasd_uid *uid)
78{
79 struct alias_pav_group *pos;
80 __u8 search_unit_addr;
81
82
83 if (lcu->pav == HYPER_PAV) {
84 if (list_empty(&lcu->grouplist))
85 return NULL;
86 else
87 return list_first_entry(&lcu->grouplist,
88 struct alias_pav_group, group);
89 }
90
91
92 if (uid->type == UA_BASE_DEVICE)
93 search_unit_addr = uid->real_unit_addr;
94 else
95 search_unit_addr = uid->base_unit_addr;
96 list_for_each_entry(pos, &lcu->grouplist, group) {
97 if (pos->uid.base_unit_addr == search_unit_addr &&
98 !strncmp(pos->uid.vduit, uid->vduit, sizeof(uid->vduit)))
99 return pos;
100 };
101 return NULL;
102}
103
104static struct alias_server *_allocate_server(struct dasd_uid *uid)
105{
106 struct alias_server *server;
107
108 server = kzalloc(sizeof(*server), GFP_KERNEL);
109 if (!server)
110 return ERR_PTR(-ENOMEM);
111 memcpy(server->uid.vendor, uid->vendor, sizeof(uid->vendor));
112 memcpy(server->uid.serial, uid->serial, sizeof(uid->serial));
113 INIT_LIST_HEAD(&server->server);
114 INIT_LIST_HEAD(&server->lculist);
115 return server;
116}
117
118static void _free_server(struct alias_server *server)
119{
120 kfree(server);
121}
122
123static struct alias_lcu *_allocate_lcu(struct dasd_uid *uid)
124{
125 struct alias_lcu *lcu;
126
127 lcu = kzalloc(sizeof(*lcu), GFP_KERNEL);
128 if (!lcu)
129 return ERR_PTR(-ENOMEM);
130 lcu->uac = kzalloc(sizeof(*(lcu->uac)), GFP_KERNEL | GFP_DMA);
131 if (!lcu->uac)
132 goto out_err1;
133 lcu->rsu_cqr = kzalloc(sizeof(*lcu->rsu_cqr), GFP_KERNEL | GFP_DMA);
134 if (!lcu->rsu_cqr)
135 goto out_err2;
136 lcu->rsu_cqr->cpaddr = kzalloc(sizeof(struct ccw1),
137 GFP_KERNEL | GFP_DMA);
138 if (!lcu->rsu_cqr->cpaddr)
139 goto out_err3;
140 lcu->rsu_cqr->data = kzalloc(16, GFP_KERNEL | GFP_DMA);
141 if (!lcu->rsu_cqr->data)
142 goto out_err4;
143
144 memcpy(lcu->uid.vendor, uid->vendor, sizeof(uid->vendor));
145 memcpy(lcu->uid.serial, uid->serial, sizeof(uid->serial));
146 lcu->uid.ssid = uid->ssid;
147 lcu->pav = NO_PAV;
148 lcu->flags = NEED_UAC_UPDATE | UPDATE_PENDING;
149 INIT_LIST_HEAD(&lcu->lcu);
150 INIT_LIST_HEAD(&lcu->inactive_devices);
151 INIT_LIST_HEAD(&lcu->active_devices);
152 INIT_LIST_HEAD(&lcu->grouplist);
153 INIT_WORK(&lcu->suc_data.worker, summary_unit_check_handling_work);
154 INIT_DELAYED_WORK(&lcu->ruac_data.dwork, lcu_update_work);
155 spin_lock_init(&lcu->lock);
156 init_completion(&lcu->lcu_setup);
157 return lcu;
158
159out_err4:
160 kfree(lcu->rsu_cqr->cpaddr);
161out_err3:
162 kfree(lcu->rsu_cqr);
163out_err2:
164 kfree(lcu->uac);
165out_err1:
166 kfree(lcu);
167 return ERR_PTR(-ENOMEM);
168}
169
170static void _free_lcu(struct alias_lcu *lcu)
171{
172 kfree(lcu->rsu_cqr->data);
173 kfree(lcu->rsu_cqr->cpaddr);
174 kfree(lcu->rsu_cqr);
175 kfree(lcu->uac);
176 kfree(lcu);
177}
178
179
180
181
182
183
184
185
186int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)
187{
188 struct dasd_eckd_private *private;
189 unsigned long flags;
190 struct alias_server *server, *newserver;
191 struct alias_lcu *lcu, *newlcu;
192 int is_lcu_known;
193 struct dasd_uid uid;
194
195 private = (struct dasd_eckd_private *) device->private;
196
197 device->discipline->get_uid(device, &uid);
198 spin_lock_irqsave(&aliastree.lock, flags);
199 is_lcu_known = 1;
200 server = _find_server(&uid);
201 if (!server) {
202 spin_unlock_irqrestore(&aliastree.lock, flags);
203 newserver = _allocate_server(&uid);
204 if (IS_ERR(newserver))
205 return PTR_ERR(newserver);
206 spin_lock_irqsave(&aliastree.lock, flags);
207 server = _find_server(&uid);
208 if (!server) {
209 list_add(&newserver->server, &aliastree.serverlist);
210 server = newserver;
211 is_lcu_known = 0;
212 } else {
213
214 _free_server(newserver);
215 }
216 }
217
218 lcu = _find_lcu(server, &uid);
219 if (!lcu) {
220 spin_unlock_irqrestore(&aliastree.lock, flags);
221 newlcu = _allocate_lcu(&uid);
222 if (IS_ERR(newlcu))
223 return PTR_ERR(newlcu);
224 spin_lock_irqsave(&aliastree.lock, flags);
225 lcu = _find_lcu(server, &uid);
226 if (!lcu) {
227 list_add(&newlcu->lcu, &server->lculist);
228 lcu = newlcu;
229 is_lcu_known = 0;
230 } else {
231
232 _free_lcu(newlcu);
233 }
234 is_lcu_known = 0;
235 }
236 spin_lock(&lcu->lock);
237 list_add(&device->alias_list, &lcu->inactive_devices);
238 private->lcu = lcu;
239 spin_unlock(&lcu->lock);
240 spin_unlock_irqrestore(&aliastree.lock, flags);
241
242 return is_lcu_known;
243}
244
245
246
247
248
249
250
251
252
253
254void dasd_alias_lcu_setup_complete(struct dasd_device *device)
255{
256 unsigned long flags;
257 struct alias_server *server;
258 struct alias_lcu *lcu;
259 struct dasd_uid uid;
260
261 device->discipline->get_uid(device, &uid);
262 lcu = NULL;
263 spin_lock_irqsave(&aliastree.lock, flags);
264 server = _find_server(&uid);
265 if (server)
266 lcu = _find_lcu(server, &uid);
267 spin_unlock_irqrestore(&aliastree.lock, flags);
268 if (!lcu) {
269 DBF_EVENT_DEVID(DBF_ERR, device->cdev,
270 "could not find lcu for %04x %02x",
271 uid.ssid, uid.real_unit_addr);
272 WARN_ON(1);
273 return;
274 }
275 complete_all(&lcu->lcu_setup);
276}
277
278void dasd_alias_wait_for_lcu_setup(struct dasd_device *device)
279{
280 unsigned long flags;
281 struct alias_server *server;
282 struct alias_lcu *lcu;
283 struct dasd_uid uid;
284
285 device->discipline->get_uid(device, &uid);
286 lcu = NULL;
287 spin_lock_irqsave(&aliastree.lock, flags);
288 server = _find_server(&uid);
289 if (server)
290 lcu = _find_lcu(server, &uid);
291 spin_unlock_irqrestore(&aliastree.lock, flags);
292 if (!lcu) {
293 DBF_EVENT_DEVID(DBF_ERR, device->cdev,
294 "could not find lcu for %04x %02x",
295 uid.ssid, uid.real_unit_addr);
296 WARN_ON(1);
297 return;
298 }
299 wait_for_completion(&lcu->lcu_setup);
300}
301
302
303
304
305
306
307void dasd_alias_disconnect_device_from_lcu(struct dasd_device *device)
308{
309 struct dasd_eckd_private *private;
310 unsigned long flags;
311 struct alias_lcu *lcu;
312 struct alias_server *server;
313 int was_pending;
314 struct dasd_uid uid;
315
316 private = (struct dasd_eckd_private *) device->private;
317 lcu = private->lcu;
318
319 if (!lcu)
320 return;
321 device->discipline->get_uid(device, &uid);
322 spin_lock_irqsave(&lcu->lock, flags);
323 list_del_init(&device->alias_list);
324
325 if (device == lcu->suc_data.device) {
326 spin_unlock_irqrestore(&lcu->lock, flags);
327 cancel_work_sync(&lcu->suc_data.worker);
328 spin_lock_irqsave(&lcu->lock, flags);
329 if (device == lcu->suc_data.device)
330 lcu->suc_data.device = NULL;
331 }
332 was_pending = 0;
333 if (device == lcu->ruac_data.device) {
334 spin_unlock_irqrestore(&lcu->lock, flags);
335 was_pending = 1;
336 cancel_delayed_work_sync(&lcu->ruac_data.dwork);
337 spin_lock_irqsave(&lcu->lock, flags);
338 if (device == lcu->ruac_data.device)
339 lcu->ruac_data.device = NULL;
340 }
341 private->lcu = NULL;
342 spin_unlock_irqrestore(&lcu->lock, flags);
343
344 spin_lock_irqsave(&aliastree.lock, flags);
345 spin_lock(&lcu->lock);
346 if (list_empty(&lcu->grouplist) &&
347 list_empty(&lcu->active_devices) &&
348 list_empty(&lcu->inactive_devices)) {
349 list_del(&lcu->lcu);
350 spin_unlock(&lcu->lock);
351 _free_lcu(lcu);
352 lcu = NULL;
353 } else {
354 if (was_pending)
355 _schedule_lcu_update(lcu, NULL);
356 spin_unlock(&lcu->lock);
357 }
358 server = _find_server(&uid);
359 if (server && list_empty(&server->lculist)) {
360 list_del(&server->server);
361 _free_server(server);
362 }
363 spin_unlock_irqrestore(&aliastree.lock, flags);
364}
365
366
367
368
369
370
371
372static int _add_device_to_lcu(struct alias_lcu *lcu,
373 struct dasd_device *device,
374 struct dasd_device *pos)
375{
376
377 struct dasd_eckd_private *private;
378 struct alias_pav_group *group;
379 struct dasd_uid uid;
380 unsigned long flags;
381
382 private = (struct dasd_eckd_private *) device->private;
383
384
385 if (device != pos)
386 spin_lock_irqsave_nested(get_ccwdev_lock(device->cdev), flags,
387 CDEV_NESTED_SECOND);
388 private->uid.type = lcu->uac->unit[private->uid.real_unit_addr].ua_type;
389 private->uid.base_unit_addr =
390 lcu->uac->unit[private->uid.real_unit_addr].base_ua;
391 uid = private->uid;
392
393 if (device != pos)
394 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
395
396
397 if (lcu->pav == NO_PAV) {
398 list_move(&device->alias_list, &lcu->active_devices);
399 return 0;
400 }
401
402 group = _find_group(lcu, &uid);
403 if (!group) {
404 group = kzalloc(sizeof(*group), GFP_ATOMIC);
405 if (!group)
406 return -ENOMEM;
407 memcpy(group->uid.vendor, uid.vendor, sizeof(uid.vendor));
408 memcpy(group->uid.serial, uid.serial, sizeof(uid.serial));
409 group->uid.ssid = uid.ssid;
410 if (uid.type == UA_BASE_DEVICE)
411 group->uid.base_unit_addr = uid.real_unit_addr;
412 else
413 group->uid.base_unit_addr = uid.base_unit_addr;
414 memcpy(group->uid.vduit, uid.vduit, sizeof(uid.vduit));
415 INIT_LIST_HEAD(&group->group);
416 INIT_LIST_HEAD(&group->baselist);
417 INIT_LIST_HEAD(&group->aliaslist);
418 list_add(&group->group, &lcu->grouplist);
419 }
420 if (uid.type == UA_BASE_DEVICE)
421 list_move(&device->alias_list, &group->baselist);
422 else
423 list_move(&device->alias_list, &group->aliaslist);
424 private->pavgroup = group;
425 return 0;
426};
427
428static void _remove_device_from_lcu(struct alias_lcu *lcu,
429 struct dasd_device *device)
430{
431 struct dasd_eckd_private *private;
432 struct alias_pav_group *group;
433
434 private = (struct dasd_eckd_private *) device->private;
435 list_move(&device->alias_list, &lcu->inactive_devices);
436 group = private->pavgroup;
437 if (!group)
438 return;
439 private->pavgroup = NULL;
440 if (list_empty(&group->baselist) && list_empty(&group->aliaslist)) {
441 list_del(&group->group);
442 kfree(group);
443 return;
444 }
445 if (group->next == device)
446 group->next = NULL;
447};
448
449static int read_unit_address_configuration(struct dasd_device *device,
450 struct alias_lcu *lcu)
451{
452 struct dasd_psf_prssd_data *prssdp;
453 struct dasd_ccw_req *cqr;
454 struct ccw1 *ccw;
455 int rc;
456 unsigned long flags;
457
458 cqr = dasd_kmalloc_request(DASD_ECKD_MAGIC, 1 + 1 ,
459 (sizeof(struct dasd_psf_prssd_data)),
460 device);
461 if (IS_ERR(cqr))
462 return PTR_ERR(cqr);
463 cqr->startdev = device;
464 cqr->memdev = device;
465 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
466 cqr->retries = 10;
467 cqr->expires = 20 * HZ;
468
469
470 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
471 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
472 prssdp->order = PSF_ORDER_PRSSD;
473 prssdp->suborder = 0x0e;
474
475
476 ccw = cqr->cpaddr;
477 ccw->cmd_code = DASD_ECKD_CCW_PSF;
478 ccw->count = sizeof(struct dasd_psf_prssd_data);
479 ccw->flags |= CCW_FLAG_CC;
480 ccw->cda = (__u32)(addr_t) prssdp;
481
482
483 memset(lcu->uac, 0, sizeof(*(lcu->uac)));
484
485 ccw++;
486 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
487 ccw->count = sizeof(*(lcu->uac));
488 ccw->cda = (__u32)(addr_t) lcu->uac;
489
490 cqr->buildclk = get_clock();
491 cqr->status = DASD_CQR_FILLED;
492
493
494 spin_lock_irqsave(&lcu->lock, flags);
495 lcu->flags &= ~NEED_UAC_UPDATE;
496 spin_unlock_irqrestore(&lcu->lock, flags);
497
498 do {
499 rc = dasd_sleep_on(cqr);
500 } while (rc && (cqr->retries > 0));
501 if (rc) {
502 spin_lock_irqsave(&lcu->lock, flags);
503 lcu->flags |= NEED_UAC_UPDATE;
504 spin_unlock_irqrestore(&lcu->lock, flags);
505 }
506 dasd_kfree_request(cqr, cqr->memdev);
507 return rc;
508}
509
510static int _lcu_update(struct dasd_device *refdev, struct alias_lcu *lcu)
511{
512 unsigned long flags;
513 struct alias_pav_group *pavgroup, *tempgroup;
514 struct dasd_device *device, *tempdev;
515 int i, rc;
516 struct dasd_eckd_private *private;
517
518 spin_lock_irqsave(&lcu->lock, flags);
519 list_for_each_entry_safe(pavgroup, tempgroup, &lcu->grouplist, group) {
520 list_for_each_entry_safe(device, tempdev, &pavgroup->baselist,
521 alias_list) {
522 list_move(&device->alias_list, &lcu->active_devices);
523 private = (struct dasd_eckd_private *) device->private;
524 private->pavgroup = NULL;
525 }
526 list_for_each_entry_safe(device, tempdev, &pavgroup->aliaslist,
527 alias_list) {
528 list_move(&device->alias_list, &lcu->active_devices);
529 private = (struct dasd_eckd_private *) device->private;
530 private->pavgroup = NULL;
531 }
532 list_del(&pavgroup->group);
533 kfree(pavgroup);
534 }
535 spin_unlock_irqrestore(&lcu->lock, flags);
536
537 rc = read_unit_address_configuration(refdev, lcu);
538 if (rc)
539 return rc;
540
541
542 spin_lock_irqsave_nested(get_ccwdev_lock(refdev->cdev), flags,
543 CDEV_NESTED_FIRST);
544 spin_lock(&lcu->lock);
545 lcu->pav = NO_PAV;
546 for (i = 0; i < MAX_DEVICES_PER_LCU; ++i) {
547 switch (lcu->uac->unit[i].ua_type) {
548 case UA_BASE_PAV_ALIAS:
549 lcu->pav = BASE_PAV;
550 break;
551 case UA_HYPER_PAV_ALIAS:
552 lcu->pav = HYPER_PAV;
553 break;
554 }
555 if (lcu->pav != NO_PAV)
556 break;
557 }
558
559 list_for_each_entry_safe(device, tempdev, &lcu->active_devices,
560 alias_list) {
561 _add_device_to_lcu(lcu, device, refdev);
562 }
563 spin_unlock(&lcu->lock);
564 spin_unlock_irqrestore(get_ccwdev_lock(refdev->cdev), flags);
565 return 0;
566}
567
568static void lcu_update_work(struct work_struct *work)
569{
570 struct alias_lcu *lcu;
571 struct read_uac_work_data *ruac_data;
572 struct dasd_device *device;
573 unsigned long flags;
574 int rc;
575
576 ruac_data = container_of(work, struct read_uac_work_data, dwork.work);
577 lcu = container_of(ruac_data, struct alias_lcu, ruac_data);
578 device = ruac_data->device;
579 rc = _lcu_update(device, lcu);
580
581
582
583
584
585 spin_lock_irqsave(&lcu->lock, flags);
586 if (rc || (lcu->flags & NEED_UAC_UPDATE)) {
587 DBF_DEV_EVENT(DBF_WARNING, device, "could not update"
588 " alias data in lcu (rc = %d), retry later", rc);
589 schedule_delayed_work(&lcu->ruac_data.dwork, 30*HZ);
590 } else {
591 lcu->ruac_data.device = NULL;
592 lcu->flags &= ~UPDATE_PENDING;
593 }
594 spin_unlock_irqrestore(&lcu->lock, flags);
595}
596
597static int _schedule_lcu_update(struct alias_lcu *lcu,
598 struct dasd_device *device)
599{
600 struct dasd_device *usedev = NULL;
601 struct alias_pav_group *group;
602
603 lcu->flags |= NEED_UAC_UPDATE;
604 if (lcu->ruac_data.device) {
605
606 return 0;
607 }
608 if (device && !list_empty(&device->alias_list))
609 usedev = device;
610
611 if (!usedev && !list_empty(&lcu->grouplist)) {
612 group = list_first_entry(&lcu->grouplist,
613 struct alias_pav_group, group);
614 if (!list_empty(&group->baselist))
615 usedev = list_first_entry(&group->baselist,
616 struct dasd_device,
617 alias_list);
618 else if (!list_empty(&group->aliaslist))
619 usedev = list_first_entry(&group->aliaslist,
620 struct dasd_device,
621 alias_list);
622 }
623 if (!usedev && !list_empty(&lcu->active_devices)) {
624 usedev = list_first_entry(&lcu->active_devices,
625 struct dasd_device, alias_list);
626 }
627
628
629
630
631 if (!usedev)
632 return -EINVAL;
633 lcu->ruac_data.device = usedev;
634 schedule_delayed_work(&lcu->ruac_data.dwork, 0);
635 return 0;
636}
637
638int dasd_alias_add_device(struct dasd_device *device)
639{
640 struct dasd_eckd_private *private;
641 struct alias_lcu *lcu;
642 unsigned long flags;
643 int rc;
644
645 private = (struct dasd_eckd_private *) device->private;
646 lcu = private->lcu;
647 rc = 0;
648
649
650 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
651 spin_lock(&lcu->lock);
652 if (!(lcu->flags & UPDATE_PENDING)) {
653 rc = _add_device_to_lcu(lcu, device, device);
654 if (rc)
655 lcu->flags |= UPDATE_PENDING;
656 }
657 if (lcu->flags & UPDATE_PENDING) {
658 list_move(&device->alias_list, &lcu->active_devices);
659 _schedule_lcu_update(lcu, device);
660 }
661 spin_unlock(&lcu->lock);
662 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
663 return rc;
664}
665
666int dasd_alias_update_add_device(struct dasd_device *device)
667{
668 struct dasd_eckd_private *private;
669 private = (struct dasd_eckd_private *) device->private;
670 private->lcu->flags |= UPDATE_PENDING;
671 return dasd_alias_add_device(device);
672}
673
674int dasd_alias_remove_device(struct dasd_device *device)
675{
676 struct dasd_eckd_private *private;
677 struct alias_lcu *lcu;
678 unsigned long flags;
679
680 private = (struct dasd_eckd_private *) device->private;
681 lcu = private->lcu;
682
683 if (!lcu)
684 return 0;
685 spin_lock_irqsave(&lcu->lock, flags);
686 _remove_device_from_lcu(lcu, device);
687 spin_unlock_irqrestore(&lcu->lock, flags);
688 return 0;
689}
690
691struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *base_device)
692{
693
694 struct dasd_device *alias_device;
695 struct alias_pav_group *group;
696 struct alias_lcu *lcu;
697 struct dasd_eckd_private *private, *alias_priv;
698 unsigned long flags;
699
700 private = (struct dasd_eckd_private *) base_device->private;
701 group = private->pavgroup;
702 lcu = private->lcu;
703 if (!group || !lcu)
704 return NULL;
705 if (lcu->pav == NO_PAV ||
706 lcu->flags & (NEED_UAC_UPDATE | UPDATE_PENDING))
707 return NULL;
708
709 spin_lock_irqsave(&lcu->lock, flags);
710 alias_device = group->next;
711 if (!alias_device) {
712 if (list_empty(&group->aliaslist)) {
713 spin_unlock_irqrestore(&lcu->lock, flags);
714 return NULL;
715 } else {
716 alias_device = list_first_entry(&group->aliaslist,
717 struct dasd_device,
718 alias_list);
719 }
720 }
721 if (list_is_last(&alias_device->alias_list, &group->aliaslist))
722 group->next = list_first_entry(&group->aliaslist,
723 struct dasd_device, alias_list);
724 else
725 group->next = list_first_entry(&alias_device->alias_list,
726 struct dasd_device, alias_list);
727 spin_unlock_irqrestore(&lcu->lock, flags);
728 alias_priv = (struct dasd_eckd_private *) alias_device->private;
729 if ((alias_priv->count < private->count) && !alias_device->stopped)
730 return alias_device;
731 else
732 return NULL;
733}
734
735
736
737
738
739static int reset_summary_unit_check(struct alias_lcu *lcu,
740 struct dasd_device *device,
741 char reason)
742{
743 struct dasd_ccw_req *cqr;
744 int rc = 0;
745 struct ccw1 *ccw;
746
747 cqr = lcu->rsu_cqr;
748 strncpy((char *) &cqr->magic, "ECKD", 4);
749 ASCEBC((char *) &cqr->magic, 4);
750 ccw = cqr->cpaddr;
751 ccw->cmd_code = DASD_ECKD_CCW_RSCK;
752 ccw->flags = 0 ;
753 ccw->count = 16;
754 ccw->cda = (__u32)(addr_t) cqr->data;
755 ((char *)cqr->data)[0] = reason;
756
757 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
758 cqr->retries = 255;
759 cqr->startdev = device;
760 cqr->memdev = device;
761 cqr->block = NULL;
762 cqr->expires = 5 * HZ;
763 cqr->buildclk = get_clock();
764 cqr->status = DASD_CQR_FILLED;
765
766 rc = dasd_sleep_on_immediatly(cqr);
767 return rc;
768}
769
770static void _restart_all_base_devices_on_lcu(struct alias_lcu *lcu)
771{
772 struct alias_pav_group *pavgroup;
773 struct dasd_device *device;
774 struct dasd_eckd_private *private;
775 unsigned long flags;
776
777
778 list_for_each_entry(device, &lcu->active_devices, alias_list) {
779 private = (struct dasd_eckd_private *) device->private;
780 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
781 if (private->uid.type != UA_BASE_DEVICE) {
782 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
783 flags);
784 continue;
785 }
786 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
787 dasd_schedule_block_bh(device->block);
788 dasd_schedule_device_bh(device);
789 }
790 list_for_each_entry(device, &lcu->inactive_devices, alias_list) {
791 private = (struct dasd_eckd_private *) device->private;
792 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
793 if (private->uid.type != UA_BASE_DEVICE) {
794 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
795 flags);
796 continue;
797 }
798 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
799 dasd_schedule_block_bh(device->block);
800 dasd_schedule_device_bh(device);
801 }
802 list_for_each_entry(pavgroup, &lcu->grouplist, group) {
803 list_for_each_entry(device, &pavgroup->baselist, alias_list) {
804 dasd_schedule_block_bh(device->block);
805 dasd_schedule_device_bh(device);
806 }
807 }
808}
809
810static void flush_all_alias_devices_on_lcu(struct alias_lcu *lcu)
811{
812 struct alias_pav_group *pavgroup;
813 struct dasd_device *device, *temp;
814 struct dasd_eckd_private *private;
815 int rc;
816 unsigned long flags;
817 LIST_HEAD(active);
818
819
820
821
822
823
824
825
826
827
828
829
830 spin_lock_irqsave(&lcu->lock, flags);
831 list_for_each_entry_safe(device, temp, &lcu->active_devices,
832 alias_list) {
833 private = (struct dasd_eckd_private *) device->private;
834 if (private->uid.type == UA_BASE_DEVICE)
835 continue;
836 list_move(&device->alias_list, &active);
837 }
838
839 list_for_each_entry(pavgroup, &lcu->grouplist, group) {
840 list_splice_init(&pavgroup->aliaslist, &active);
841 }
842 while (!list_empty(&active)) {
843 device = list_first_entry(&active, struct dasd_device,
844 alias_list);
845 spin_unlock_irqrestore(&lcu->lock, flags);
846 rc = dasd_flush_device_queue(device);
847 spin_lock_irqsave(&lcu->lock, flags);
848
849
850
851
852 if (device == list_first_entry(&active,
853 struct dasd_device, alias_list))
854 list_move(&device->alias_list, &lcu->active_devices);
855 }
856 spin_unlock_irqrestore(&lcu->lock, flags);
857}
858
859static void __stop_device_on_lcu(struct dasd_device *device,
860 struct dasd_device *pos)
861{
862
863 if (pos == device) {
864 dasd_device_set_stop_bits(pos, DASD_STOPPED_SU);
865 return;
866 }
867 spin_lock(get_ccwdev_lock(pos->cdev));
868 dasd_device_set_stop_bits(pos, DASD_STOPPED_SU);
869 spin_unlock(get_ccwdev_lock(pos->cdev));
870}
871
872
873
874
875
876static void _stop_all_devices_on_lcu(struct alias_lcu *lcu,
877 struct dasd_device *device)
878{
879 struct alias_pav_group *pavgroup;
880 struct dasd_device *pos;
881
882 list_for_each_entry(pos, &lcu->active_devices, alias_list)
883 __stop_device_on_lcu(device, pos);
884 list_for_each_entry(pos, &lcu->inactive_devices, alias_list)
885 __stop_device_on_lcu(device, pos);
886 list_for_each_entry(pavgroup, &lcu->grouplist, group) {
887 list_for_each_entry(pos, &pavgroup->baselist, alias_list)
888 __stop_device_on_lcu(device, pos);
889 list_for_each_entry(pos, &pavgroup->aliaslist, alias_list)
890 __stop_device_on_lcu(device, pos);
891 }
892}
893
894static void _unstop_all_devices_on_lcu(struct alias_lcu *lcu)
895{
896 struct alias_pav_group *pavgroup;
897 struct dasd_device *device;
898 unsigned long flags;
899
900 list_for_each_entry(device, &lcu->active_devices, alias_list) {
901 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
902 dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
903 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
904 }
905
906 list_for_each_entry(device, &lcu->inactive_devices, alias_list) {
907 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
908 dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
909 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
910 }
911
912 list_for_each_entry(pavgroup, &lcu->grouplist, group) {
913 list_for_each_entry(device, &pavgroup->baselist, alias_list) {
914 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
915 dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
916 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
917 flags);
918 }
919 list_for_each_entry(device, &pavgroup->aliaslist, alias_list) {
920 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
921 dasd_device_remove_stop_bits(device, DASD_STOPPED_SU);
922 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
923 flags);
924 }
925 }
926}
927
928static void summary_unit_check_handling_work(struct work_struct *work)
929{
930 struct alias_lcu *lcu;
931 struct summary_unit_check_work_data *suc_data;
932 unsigned long flags;
933 struct dasd_device *device;
934
935 suc_data = container_of(work, struct summary_unit_check_work_data,
936 worker);
937 lcu = container_of(suc_data, struct alias_lcu, suc_data);
938 device = suc_data->device;
939
940
941 flush_all_alias_devices_on_lcu(lcu);
942
943
944 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
945 dasd_device_remove_stop_bits(device,
946 (DASD_STOPPED_SU | DASD_STOPPED_PENDING));
947 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
948 reset_summary_unit_check(lcu, device, suc_data->reason);
949
950 spin_lock_irqsave(&lcu->lock, flags);
951 _unstop_all_devices_on_lcu(lcu);
952 _restart_all_base_devices_on_lcu(lcu);
953
954 _schedule_lcu_update(lcu, device);
955 lcu->suc_data.device = NULL;
956 spin_unlock_irqrestore(&lcu->lock, flags);
957}
958
959
960
961
962void dasd_alias_handle_summary_unit_check(struct dasd_device *device,
963 struct irb *irb)
964{
965 struct alias_lcu *lcu;
966 char reason;
967 struct dasd_eckd_private *private;
968 char *sense;
969
970 private = (struct dasd_eckd_private *) device->private;
971
972 sense = dasd_get_sense(irb);
973 if (sense) {
974 reason = sense[8];
975 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
976 "eckd handle summary unit check: reason", reason);
977 } else {
978 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
979 "eckd handle summary unit check:"
980 " no reason code available");
981 return;
982 }
983
984 lcu = private->lcu;
985 if (!lcu) {
986 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
987 "device not ready to handle summary"
988 " unit check (no lcu structure)");
989 return;
990 }
991 spin_lock(&lcu->lock);
992 _stop_all_devices_on_lcu(lcu, device);
993
994 private->lcu->flags |= NEED_UAC_UPDATE | UPDATE_PENDING;
995
996
997
998 if (list_empty(&device->alias_list)) {
999 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1000 "device is in offline processing,"
1001 " don't do summary unit check handling");
1002 spin_unlock(&lcu->lock);
1003 return;
1004 }
1005 if (lcu->suc_data.device) {
1006
1007 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1008 "previous instance of summary unit check worker"
1009 " still pending");
1010 spin_unlock(&lcu->lock);
1011 return ;
1012 }
1013 lcu->suc_data.reason = reason;
1014 lcu->suc_data.device = device;
1015 spin_unlock(&lcu->lock);
1016 schedule_work(&lcu->suc_data.worker);
1017};
1018