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11#define KMSG_COMPONENT "cio"
12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14#include <linux/export.h>
15#include <linux/init.h>
16#include <linux/device.h>
17#include <linux/slab.h>
18#include <linux/errno.h>
19#include <linux/list.h>
20#include <linux/reboot.h>
21#include <linux/suspend.h>
22#include <linux/proc_fs.h>
23#include <linux/genalloc.h>
24#include <linux/dma-mapping.h>
25#include <asm/isc.h>
26#include <asm/crw.h>
27
28#include "css.h"
29#include "cio.h"
30#include "blacklist.h"
31#include "cio_debug.h"
32#include "ioasm.h"
33#include "chsc.h"
34#include "device.h"
35#include "idset.h"
36#include "chp.h"
37
38int css_init_done = 0;
39int max_ssid;
40
41#define MAX_CSS_IDX 0
42struct channel_subsystem *channel_subsystems[MAX_CSS_IDX + 1];
43static struct bus_type css_bus_type;
44
45int
46for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
47{
48 struct subchannel_id schid;
49 int ret;
50
51 init_subchannel_id(&schid);
52 do {
53 do {
54 ret = fn(schid, data);
55 if (ret)
56 break;
57 } while (schid.sch_no++ < __MAX_SUBCHANNEL);
58 schid.sch_no = 0;
59 } while (schid.ssid++ < max_ssid);
60 return ret;
61}
62
63struct cb_data {
64 void *data;
65 struct idset *set;
66 int (*fn_known_sch)(struct subchannel *, void *);
67 int (*fn_unknown_sch)(struct subchannel_id, void *);
68};
69
70static int call_fn_known_sch(struct device *dev, void *data)
71{
72 struct subchannel *sch = to_subchannel(dev);
73 struct cb_data *cb = data;
74 int rc = 0;
75
76 if (cb->set)
77 idset_sch_del(cb->set, sch->schid);
78 if (cb->fn_known_sch)
79 rc = cb->fn_known_sch(sch, cb->data);
80 return rc;
81}
82
83static int call_fn_unknown_sch(struct subchannel_id schid, void *data)
84{
85 struct cb_data *cb = data;
86 int rc = 0;
87
88 if (idset_sch_contains(cb->set, schid))
89 rc = cb->fn_unknown_sch(schid, cb->data);
90 return rc;
91}
92
93static int call_fn_all_sch(struct subchannel_id schid, void *data)
94{
95 struct cb_data *cb = data;
96 struct subchannel *sch;
97 int rc = 0;
98
99 sch = get_subchannel_by_schid(schid);
100 if (sch) {
101 if (cb->fn_known_sch)
102 rc = cb->fn_known_sch(sch, cb->data);
103 put_device(&sch->dev);
104 } else {
105 if (cb->fn_unknown_sch)
106 rc = cb->fn_unknown_sch(schid, cb->data);
107 }
108
109 return rc;
110}
111
112int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
113 int (*fn_unknown)(struct subchannel_id,
114 void *), void *data)
115{
116 struct cb_data cb;
117 int rc;
118
119 cb.data = data;
120 cb.fn_known_sch = fn_known;
121 cb.fn_unknown_sch = fn_unknown;
122
123 if (fn_known && !fn_unknown) {
124
125 cb.set = NULL;
126 return bus_for_each_dev(&css_bus_type, NULL, &cb,
127 call_fn_known_sch);
128 }
129
130 cb.set = idset_sch_new();
131 if (!cb.set)
132
133 return for_each_subchannel(call_fn_all_sch, &cb);
134
135 idset_fill(cb.set);
136
137
138 rc = bus_for_each_dev(&css_bus_type, NULL, &cb, call_fn_known_sch);
139 if (rc)
140 goto out;
141
142 if (fn_unknown)
143 rc = for_each_subchannel(call_fn_unknown_sch, &cb);
144out:
145 idset_free(cb.set);
146
147 return rc;
148}
149
150static void css_sch_todo(struct work_struct *work);
151
152static int css_sch_create_locks(struct subchannel *sch)
153{
154 sch->lock = kmalloc(sizeof(*sch->lock), GFP_KERNEL);
155 if (!sch->lock)
156 return -ENOMEM;
157
158 spin_lock_init(sch->lock);
159 mutex_init(&sch->reg_mutex);
160
161 return 0;
162}
163
164static void css_subchannel_release(struct device *dev)
165{
166 struct subchannel *sch = to_subchannel(dev);
167
168 sch->config.intparm = 0;
169 cio_commit_config(sch);
170 kfree(sch->driver_override);
171 kfree(sch->lock);
172 kfree(sch);
173}
174
175static int css_validate_subchannel(struct subchannel_id schid,
176 struct schib *schib)
177{
178 int err;
179
180 switch (schib->pmcw.st) {
181 case SUBCHANNEL_TYPE_IO:
182 case SUBCHANNEL_TYPE_MSG:
183 if (!css_sch_is_valid(schib))
184 err = -ENODEV;
185 else if (is_blacklisted(schid.ssid, schib->pmcw.dev)) {
186 CIO_MSG_EVENT(6, "Blacklisted device detected "
187 "at devno %04X, subchannel set %x\n",
188 schib->pmcw.dev, schid.ssid);
189 err = -ENODEV;
190 } else
191 err = 0;
192 break;
193 default:
194 err = 0;
195 }
196 if (err)
197 goto out;
198
199 CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
200 schid.ssid, schid.sch_no, schib->pmcw.st);
201out:
202 return err;
203}
204
205struct subchannel *css_alloc_subchannel(struct subchannel_id schid,
206 struct schib *schib)
207{
208 struct subchannel *sch;
209 int ret;
210
211 ret = css_validate_subchannel(schid, schib);
212 if (ret < 0)
213 return ERR_PTR(ret);
214
215 sch = kzalloc(sizeof(*sch), GFP_KERNEL | GFP_DMA);
216 if (!sch)
217 return ERR_PTR(-ENOMEM);
218
219 sch->schid = schid;
220 sch->schib = *schib;
221 sch->st = schib->pmcw.st;
222
223 ret = css_sch_create_locks(sch);
224 if (ret)
225 goto err;
226
227 INIT_WORK(&sch->todo_work, css_sch_todo);
228 sch->dev.release = &css_subchannel_release;
229 device_initialize(&sch->dev);
230
231
232
233
234 sch->dev.coherent_dma_mask = DMA_BIT_MASK(31);
235 sch->dev.dma_mask = &sch->dev.coherent_dma_mask;
236 return sch;
237
238err:
239 kfree(sch);
240 return ERR_PTR(ret);
241}
242
243static int css_sch_device_register(struct subchannel *sch)
244{
245 int ret;
246
247 mutex_lock(&sch->reg_mutex);
248 dev_set_name(&sch->dev, "0.%x.%04x", sch->schid.ssid,
249 sch->schid.sch_no);
250 ret = device_add(&sch->dev);
251 mutex_unlock(&sch->reg_mutex);
252 return ret;
253}
254
255
256
257
258
259void css_sch_device_unregister(struct subchannel *sch)
260{
261 mutex_lock(&sch->reg_mutex);
262 if (device_is_registered(&sch->dev))
263 device_unregister(&sch->dev);
264 mutex_unlock(&sch->reg_mutex);
265}
266EXPORT_SYMBOL_GPL(css_sch_device_unregister);
267
268static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
269{
270 int i;
271 int mask;
272
273 memset(ssd, 0, sizeof(struct chsc_ssd_info));
274 ssd->path_mask = pmcw->pim;
275 for (i = 0; i < 8; i++) {
276 mask = 0x80 >> i;
277 if (pmcw->pim & mask) {
278 chp_id_init(&ssd->chpid[i]);
279 ssd->chpid[i].id = pmcw->chpid[i];
280 }
281 }
282}
283
284static void ssd_register_chpids(struct chsc_ssd_info *ssd)
285{
286 int i;
287 int mask;
288
289 for (i = 0; i < 8; i++) {
290 mask = 0x80 >> i;
291 if (ssd->path_mask & mask)
292 chp_new(ssd->chpid[i]);
293 }
294}
295
296void css_update_ssd_info(struct subchannel *sch)
297{
298 int ret;
299
300 ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info);
301 if (ret)
302 ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
303
304 ssd_register_chpids(&sch->ssd_info);
305}
306
307static ssize_t type_show(struct device *dev, struct device_attribute *attr,
308 char *buf)
309{
310 struct subchannel *sch = to_subchannel(dev);
311
312 return sprintf(buf, "%01x\n", sch->st);
313}
314
315static DEVICE_ATTR_RO(type);
316
317static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
318 char *buf)
319{
320 struct subchannel *sch = to_subchannel(dev);
321
322 return sprintf(buf, "css:t%01X\n", sch->st);
323}
324
325static DEVICE_ATTR_RO(modalias);
326
327static ssize_t driver_override_store(struct device *dev,
328 struct device_attribute *attr,
329 const char *buf, size_t count)
330{
331 struct subchannel *sch = to_subchannel(dev);
332 char *driver_override, *old, *cp;
333
334
335 if (count >= (PAGE_SIZE - 1))
336 return -EINVAL;
337
338 driver_override = kstrndup(buf, count, GFP_KERNEL);
339 if (!driver_override)
340 return -ENOMEM;
341
342 cp = strchr(driver_override, '\n');
343 if (cp)
344 *cp = '\0';
345
346 device_lock(dev);
347 old = sch->driver_override;
348 if (strlen(driver_override)) {
349 sch->driver_override = driver_override;
350 } else {
351 kfree(driver_override);
352 sch->driver_override = NULL;
353 }
354 device_unlock(dev);
355
356 kfree(old);
357
358 return count;
359}
360
361static ssize_t driver_override_show(struct device *dev,
362 struct device_attribute *attr, char *buf)
363{
364 struct subchannel *sch = to_subchannel(dev);
365 ssize_t len;
366
367 device_lock(dev);
368 len = snprintf(buf, PAGE_SIZE, "%s\n", sch->driver_override);
369 device_unlock(dev);
370 return len;
371}
372static DEVICE_ATTR_RW(driver_override);
373
374static struct attribute *subch_attrs[] = {
375 &dev_attr_type.attr,
376 &dev_attr_modalias.attr,
377 &dev_attr_driver_override.attr,
378 NULL,
379};
380
381static struct attribute_group subch_attr_group = {
382 .attrs = subch_attrs,
383};
384
385static const struct attribute_group *default_subch_attr_groups[] = {
386 &subch_attr_group,
387 NULL,
388};
389
390static ssize_t chpids_show(struct device *dev,
391 struct device_attribute *attr,
392 char *buf)
393{
394 struct subchannel *sch = to_subchannel(dev);
395 struct chsc_ssd_info *ssd = &sch->ssd_info;
396 ssize_t ret = 0;
397 int mask;
398 int chp;
399
400 for (chp = 0; chp < 8; chp++) {
401 mask = 0x80 >> chp;
402 if (ssd->path_mask & mask)
403 ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
404 else
405 ret += sprintf(buf + ret, "00 ");
406 }
407 ret += sprintf(buf + ret, "\n");
408 return ret;
409}
410static DEVICE_ATTR_RO(chpids);
411
412static ssize_t pimpampom_show(struct device *dev,
413 struct device_attribute *attr,
414 char *buf)
415{
416 struct subchannel *sch = to_subchannel(dev);
417 struct pmcw *pmcw = &sch->schib.pmcw;
418
419 return sprintf(buf, "%02x %02x %02x\n",
420 pmcw->pim, pmcw->pam, pmcw->pom);
421}
422static DEVICE_ATTR_RO(pimpampom);
423
424static struct attribute *io_subchannel_type_attrs[] = {
425 &dev_attr_chpids.attr,
426 &dev_attr_pimpampom.attr,
427 NULL,
428};
429ATTRIBUTE_GROUPS(io_subchannel_type);
430
431static const struct device_type io_subchannel_type = {
432 .groups = io_subchannel_type_groups,
433};
434
435int css_register_subchannel(struct subchannel *sch)
436{
437 int ret;
438
439
440 sch->dev.parent = &channel_subsystems[0]->device;
441 sch->dev.bus = &css_bus_type;
442 sch->dev.groups = default_subch_attr_groups;
443
444 if (sch->st == SUBCHANNEL_TYPE_IO)
445 sch->dev.type = &io_subchannel_type;
446
447
448
449
450
451
452
453
454
455
456 dev_set_uevent_suppress(&sch->dev, 1);
457 css_update_ssd_info(sch);
458
459 ret = css_sch_device_register(sch);
460 if (ret) {
461 CIO_MSG_EVENT(0, "Could not register sch 0.%x.%04x: %d\n",
462 sch->schid.ssid, sch->schid.sch_no, ret);
463 return ret;
464 }
465 if (!sch->driver) {
466
467
468
469
470
471 dev_set_uevent_suppress(&sch->dev, 0);
472 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
473 }
474 return ret;
475}
476
477static int css_probe_device(struct subchannel_id schid, struct schib *schib)
478{
479 struct subchannel *sch;
480 int ret;
481
482 sch = css_alloc_subchannel(schid, schib);
483 if (IS_ERR(sch))
484 return PTR_ERR(sch);
485
486 ret = css_register_subchannel(sch);
487 if (ret)
488 put_device(&sch->dev);
489
490 return ret;
491}
492
493static int
494check_subchannel(struct device *dev, const void *data)
495{
496 struct subchannel *sch;
497 struct subchannel_id *schid = (void *)data;
498
499 sch = to_subchannel(dev);
500 return schid_equal(&sch->schid, schid);
501}
502
503struct subchannel *
504get_subchannel_by_schid(struct subchannel_id schid)
505{
506 struct device *dev;
507
508 dev = bus_find_device(&css_bus_type, NULL,
509 &schid, check_subchannel);
510
511 return dev ? to_subchannel(dev) : NULL;
512}
513
514
515
516
517
518int css_sch_is_valid(struct schib *schib)
519{
520 if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv)
521 return 0;
522 if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w)
523 return 0;
524 return 1;
525}
526EXPORT_SYMBOL_GPL(css_sch_is_valid);
527
528static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow)
529{
530 struct schib schib;
531 int ccode;
532
533 if (!slow) {
534
535 return -EAGAIN;
536 }
537
538
539
540
541
542
543 ccode = stsch(schid, &schib);
544 if (ccode)
545 return (ccode == 3) ? -ENXIO : ccode;
546
547 return css_probe_device(schid, &schib);
548}
549
550static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
551{
552 int ret = 0;
553
554 if (sch->driver) {
555 if (sch->driver->sch_event)
556 ret = sch->driver->sch_event(sch, slow);
557 else
558 dev_dbg(&sch->dev,
559 "Got subchannel machine check but "
560 "no sch_event handler provided.\n");
561 }
562 if (ret != 0 && ret != -EAGAIN) {
563 CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n",
564 sch->schid.ssid, sch->schid.sch_no, ret);
565 }
566 return ret;
567}
568
569static void css_evaluate_subchannel(struct subchannel_id schid, int slow)
570{
571 struct subchannel *sch;
572 int ret;
573
574 sch = get_subchannel_by_schid(schid);
575 if (sch) {
576 ret = css_evaluate_known_subchannel(sch, slow);
577 put_device(&sch->dev);
578 } else
579 ret = css_evaluate_new_subchannel(schid, slow);
580 if (ret == -EAGAIN)
581 css_schedule_eval(schid);
582}
583
584
585
586
587
588
589
590
591
592
593void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo)
594{
595 CIO_MSG_EVENT(4, "sch_todo: sched sch=0.%x.%04x todo=%d\n",
596 sch->schid.ssid, sch->schid.sch_no, todo);
597 if (sch->todo >= todo)
598 return;
599
600 if (!get_device(&sch->dev))
601 return;
602 sch->todo = todo;
603 if (!queue_work(cio_work_q, &sch->todo_work)) {
604
605 put_device(&sch->dev);
606 }
607}
608EXPORT_SYMBOL_GPL(css_sched_sch_todo);
609
610static void css_sch_todo(struct work_struct *work)
611{
612 struct subchannel *sch;
613 enum sch_todo todo;
614 int ret;
615
616 sch = container_of(work, struct subchannel, todo_work);
617
618 spin_lock_irq(sch->lock);
619 todo = sch->todo;
620 CIO_MSG_EVENT(4, "sch_todo: sch=0.%x.%04x, todo=%d\n", sch->schid.ssid,
621 sch->schid.sch_no, todo);
622 sch->todo = SCH_TODO_NOTHING;
623 spin_unlock_irq(sch->lock);
624
625 switch (todo) {
626 case SCH_TODO_NOTHING:
627 break;
628 case SCH_TODO_EVAL:
629 ret = css_evaluate_known_subchannel(sch, 1);
630 if (ret == -EAGAIN) {
631 spin_lock_irq(sch->lock);
632 css_sched_sch_todo(sch, todo);
633 spin_unlock_irq(sch->lock);
634 }
635 break;
636 case SCH_TODO_UNREG:
637 css_sch_device_unregister(sch);
638 break;
639 }
640
641 put_device(&sch->dev);
642}
643
644static struct idset *slow_subchannel_set;
645static spinlock_t slow_subchannel_lock;
646static wait_queue_head_t css_eval_wq;
647static atomic_t css_eval_scheduled;
648
649static int __init slow_subchannel_init(void)
650{
651 spin_lock_init(&slow_subchannel_lock);
652 atomic_set(&css_eval_scheduled, 0);
653 init_waitqueue_head(&css_eval_wq);
654 slow_subchannel_set = idset_sch_new();
655 if (!slow_subchannel_set) {
656 CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n");
657 return -ENOMEM;
658 }
659 return 0;
660}
661
662static int slow_eval_known_fn(struct subchannel *sch, void *data)
663{
664 int eval;
665 int rc;
666
667 spin_lock_irq(&slow_subchannel_lock);
668 eval = idset_sch_contains(slow_subchannel_set, sch->schid);
669 idset_sch_del(slow_subchannel_set, sch->schid);
670 spin_unlock_irq(&slow_subchannel_lock);
671 if (eval) {
672 rc = css_evaluate_known_subchannel(sch, 1);
673 if (rc == -EAGAIN)
674 css_schedule_eval(sch->schid);
675 }
676 return 0;
677}
678
679static int slow_eval_unknown_fn(struct subchannel_id schid, void *data)
680{
681 int eval;
682 int rc = 0;
683
684 spin_lock_irq(&slow_subchannel_lock);
685 eval = idset_sch_contains(slow_subchannel_set, schid);
686 idset_sch_del(slow_subchannel_set, schid);
687 spin_unlock_irq(&slow_subchannel_lock);
688 if (eval) {
689 rc = css_evaluate_new_subchannel(schid, 1);
690 switch (rc) {
691 case -EAGAIN:
692 css_schedule_eval(schid);
693 rc = 0;
694 break;
695 case -ENXIO:
696 case -ENOMEM:
697 case -EIO:
698
699 spin_lock_irq(&slow_subchannel_lock);
700 idset_sch_del_subseq(slow_subchannel_set, schid);
701 spin_unlock_irq(&slow_subchannel_lock);
702 break;
703 default:
704 rc = 0;
705 }
706
707
708 cond_resched();
709 }
710 return rc;
711}
712
713static void css_slow_path_func(struct work_struct *unused)
714{
715 unsigned long flags;
716
717 CIO_TRACE_EVENT(4, "slowpath");
718 for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn,
719 NULL);
720 spin_lock_irqsave(&slow_subchannel_lock, flags);
721 if (idset_is_empty(slow_subchannel_set)) {
722 atomic_set(&css_eval_scheduled, 0);
723 wake_up(&css_eval_wq);
724 }
725 spin_unlock_irqrestore(&slow_subchannel_lock, flags);
726}
727
728static DECLARE_DELAYED_WORK(slow_path_work, css_slow_path_func);
729struct workqueue_struct *cio_work_q;
730
731void css_schedule_eval(struct subchannel_id schid)
732{
733 unsigned long flags;
734
735 spin_lock_irqsave(&slow_subchannel_lock, flags);
736 idset_sch_add(slow_subchannel_set, schid);
737 atomic_set(&css_eval_scheduled, 1);
738 queue_delayed_work(cio_work_q, &slow_path_work, 0);
739 spin_unlock_irqrestore(&slow_subchannel_lock, flags);
740}
741
742void css_schedule_eval_all(void)
743{
744 unsigned long flags;
745
746 spin_lock_irqsave(&slow_subchannel_lock, flags);
747 idset_fill(slow_subchannel_set);
748 atomic_set(&css_eval_scheduled, 1);
749 queue_delayed_work(cio_work_q, &slow_path_work, 0);
750 spin_unlock_irqrestore(&slow_subchannel_lock, flags);
751}
752
753static int __unset_registered(struct device *dev, void *data)
754{
755 struct idset *set = data;
756 struct subchannel *sch = to_subchannel(dev);
757
758 idset_sch_del(set, sch->schid);
759 return 0;
760}
761
762void css_schedule_eval_all_unreg(unsigned long delay)
763{
764 unsigned long flags;
765 struct idset *unreg_set;
766
767
768 unreg_set = idset_sch_new();
769 if (!unreg_set) {
770
771 css_schedule_eval_all();
772 return;
773 }
774 idset_fill(unreg_set);
775 bus_for_each_dev(&css_bus_type, NULL, unreg_set, __unset_registered);
776
777 spin_lock_irqsave(&slow_subchannel_lock, flags);
778 idset_add_set(slow_subchannel_set, unreg_set);
779 atomic_set(&css_eval_scheduled, 1);
780 queue_delayed_work(cio_work_q, &slow_path_work, delay);
781 spin_unlock_irqrestore(&slow_subchannel_lock, flags);
782 idset_free(unreg_set);
783}
784
785void css_wait_for_slow_path(void)
786{
787 flush_workqueue(cio_work_q);
788}
789
790
791void css_schedule_reprobe(void)
792{
793
794 css_schedule_eval_all_unreg(1 * HZ);
795}
796EXPORT_SYMBOL_GPL(css_schedule_reprobe);
797
798
799
800
801static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
802{
803 struct subchannel_id mchk_schid;
804 struct subchannel *sch;
805
806 if (overflow) {
807 css_schedule_eval_all();
808 return;
809 }
810 CIO_CRW_EVENT(2, "CRW0 reports slct=%d, oflw=%d, "
811 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
812 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
813 crw0->erc, crw0->rsid);
814 if (crw1)
815 CIO_CRW_EVENT(2, "CRW1 reports slct=%d, oflw=%d, "
816 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
817 crw1->slct, crw1->oflw, crw1->chn, crw1->rsc,
818 crw1->anc, crw1->erc, crw1->rsid);
819 init_subchannel_id(&mchk_schid);
820 mchk_schid.sch_no = crw0->rsid;
821 if (crw1)
822 mchk_schid.ssid = (crw1->rsid >> 4) & 3;
823
824 if (crw0->erc == CRW_ERC_PMOD) {
825 sch = get_subchannel_by_schid(mchk_schid);
826 if (sch) {
827 css_update_ssd_info(sch);
828 put_device(&sch->dev);
829 }
830 }
831
832
833
834
835
836 css_evaluate_subchannel(mchk_schid, 0);
837}
838
839static void __init
840css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
841{
842 struct cpuid cpu_id;
843
844 if (css_general_characteristics.mcss) {
845 css->global_pgid.pgid_high.ext_cssid.version = 0x80;
846 css->global_pgid.pgid_high.ext_cssid.cssid =
847 (css->cssid < 0) ? 0 : css->cssid;
848 } else {
849 css->global_pgid.pgid_high.cpu_addr = stap();
850 }
851 get_cpu_id(&cpu_id);
852 css->global_pgid.cpu_id = cpu_id.ident;
853 css->global_pgid.cpu_model = cpu_id.machine;
854 css->global_pgid.tod_high = tod_high;
855}
856
857static void channel_subsystem_release(struct device *dev)
858{
859 struct channel_subsystem *css = to_css(dev);
860
861 mutex_destroy(&css->mutex);
862 kfree(css);
863}
864
865static ssize_t real_cssid_show(struct device *dev, struct device_attribute *a,
866 char *buf)
867{
868 struct channel_subsystem *css = to_css(dev);
869
870 if (css->cssid < 0)
871 return -EINVAL;
872
873 return sprintf(buf, "%x\n", css->cssid);
874}
875static DEVICE_ATTR_RO(real_cssid);
876
877static ssize_t cm_enable_show(struct device *dev, struct device_attribute *a,
878 char *buf)
879{
880 struct channel_subsystem *css = to_css(dev);
881 int ret;
882
883 mutex_lock(&css->mutex);
884 ret = sprintf(buf, "%x\n", css->cm_enabled);
885 mutex_unlock(&css->mutex);
886 return ret;
887}
888
889static ssize_t cm_enable_store(struct device *dev, struct device_attribute *a,
890 const char *buf, size_t count)
891{
892 struct channel_subsystem *css = to_css(dev);
893 unsigned long val;
894 int ret;
895
896 ret = kstrtoul(buf, 16, &val);
897 if (ret)
898 return ret;
899 mutex_lock(&css->mutex);
900 switch (val) {
901 case 0:
902 ret = css->cm_enabled ? chsc_secm(css, 0) : 0;
903 break;
904 case 1:
905 ret = css->cm_enabled ? 0 : chsc_secm(css, 1);
906 break;
907 default:
908 ret = -EINVAL;
909 }
910 mutex_unlock(&css->mutex);
911 return ret < 0 ? ret : count;
912}
913static DEVICE_ATTR_RW(cm_enable);
914
915static umode_t cm_enable_mode(struct kobject *kobj, struct attribute *attr,
916 int index)
917{
918 return css_chsc_characteristics.secm ? attr->mode : 0;
919}
920
921static struct attribute *cssdev_attrs[] = {
922 &dev_attr_real_cssid.attr,
923 NULL,
924};
925
926static struct attribute_group cssdev_attr_group = {
927 .attrs = cssdev_attrs,
928};
929
930static struct attribute *cssdev_cm_attrs[] = {
931 &dev_attr_cm_enable.attr,
932 NULL,
933};
934
935static struct attribute_group cssdev_cm_attr_group = {
936 .attrs = cssdev_cm_attrs,
937 .is_visible = cm_enable_mode,
938};
939
940static const struct attribute_group *cssdev_attr_groups[] = {
941 &cssdev_attr_group,
942 &cssdev_cm_attr_group,
943 NULL,
944};
945
946static int __init setup_css(int nr)
947{
948 struct channel_subsystem *css;
949 int ret;
950
951 css = kzalloc(sizeof(*css), GFP_KERNEL);
952 if (!css)
953 return -ENOMEM;
954
955 channel_subsystems[nr] = css;
956 dev_set_name(&css->device, "css%x", nr);
957 css->device.groups = cssdev_attr_groups;
958 css->device.release = channel_subsystem_release;
959
960
961
962
963
964 css->device.coherent_dma_mask = DMA_BIT_MASK(64);
965 css->device.dma_mask = &css->device.coherent_dma_mask;
966
967 mutex_init(&css->mutex);
968 css->cssid = chsc_get_cssid(nr);
969 css_generate_pgid(css, (u32) (get_tod_clock() >> 32));
970
971 ret = device_register(&css->device);
972 if (ret) {
973 put_device(&css->device);
974 goto out_err;
975 }
976
977 css->pseudo_subchannel = kzalloc(sizeof(*css->pseudo_subchannel),
978 GFP_KERNEL);
979 if (!css->pseudo_subchannel) {
980 device_unregister(&css->device);
981 ret = -ENOMEM;
982 goto out_err;
983 }
984
985 css->pseudo_subchannel->dev.parent = &css->device;
986 css->pseudo_subchannel->dev.release = css_subchannel_release;
987 mutex_init(&css->pseudo_subchannel->reg_mutex);
988 ret = css_sch_create_locks(css->pseudo_subchannel);
989 if (ret) {
990 kfree(css->pseudo_subchannel);
991 device_unregister(&css->device);
992 goto out_err;
993 }
994
995 dev_set_name(&css->pseudo_subchannel->dev, "defunct");
996 ret = device_register(&css->pseudo_subchannel->dev);
997 if (ret) {
998 put_device(&css->pseudo_subchannel->dev);
999 device_unregister(&css->device);
1000 goto out_err;
1001 }
1002
1003 return ret;
1004out_err:
1005 channel_subsystems[nr] = NULL;
1006 return ret;
1007}
1008
1009static int css_reboot_event(struct notifier_block *this,
1010 unsigned long event,
1011 void *ptr)
1012{
1013 struct channel_subsystem *css;
1014 int ret;
1015
1016 ret = NOTIFY_DONE;
1017 for_each_css(css) {
1018 mutex_lock(&css->mutex);
1019 if (css->cm_enabled)
1020 if (chsc_secm(css, 0))
1021 ret = NOTIFY_BAD;
1022 mutex_unlock(&css->mutex);
1023 }
1024
1025 return ret;
1026}
1027
1028static struct notifier_block css_reboot_notifier = {
1029 .notifier_call = css_reboot_event,
1030};
1031
1032
1033
1034
1035
1036
1037
1038static int css_power_event(struct notifier_block *this, unsigned long event,
1039 void *ptr)
1040{
1041 struct channel_subsystem *css;
1042 int ret;
1043
1044 switch (event) {
1045 case PM_HIBERNATION_PREPARE:
1046 case PM_SUSPEND_PREPARE:
1047 ret = NOTIFY_DONE;
1048 for_each_css(css) {
1049 mutex_lock(&css->mutex);
1050 if (!css->cm_enabled) {
1051 mutex_unlock(&css->mutex);
1052 continue;
1053 }
1054 ret = __chsc_do_secm(css, 0);
1055 ret = notifier_from_errno(ret);
1056 mutex_unlock(&css->mutex);
1057 }
1058 break;
1059 case PM_POST_HIBERNATION:
1060 case PM_POST_SUSPEND:
1061 ret = NOTIFY_DONE;
1062 for_each_css(css) {
1063 mutex_lock(&css->mutex);
1064 if (!css->cm_enabled) {
1065 mutex_unlock(&css->mutex);
1066 continue;
1067 }
1068 ret = __chsc_do_secm(css, 1);
1069 ret = notifier_from_errno(ret);
1070 mutex_unlock(&css->mutex);
1071 }
1072
1073 css_schedule_reprobe();
1074 break;
1075 default:
1076 ret = NOTIFY_DONE;
1077 }
1078 return ret;
1079
1080}
1081static struct notifier_block css_power_notifier = {
1082 .notifier_call = css_power_event,
1083};
1084
1085#define CIO_DMA_GFP (GFP_KERNEL | __GFP_ZERO)
1086static struct gen_pool *cio_dma_pool;
1087
1088
1089struct device *cio_get_dma_css_dev(void)
1090{
1091 return &channel_subsystems[0]->device;
1092}
1093
1094struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages)
1095{
1096 struct gen_pool *gp_dma;
1097 void *cpu_addr;
1098 dma_addr_t dma_addr;
1099 int i;
1100
1101 gp_dma = gen_pool_create(3, -1);
1102 if (!gp_dma)
1103 return NULL;
1104 for (i = 0; i < nr_pages; ++i) {
1105 cpu_addr = dma_alloc_coherent(dma_dev, PAGE_SIZE, &dma_addr,
1106 CIO_DMA_GFP);
1107 if (!cpu_addr)
1108 return gp_dma;
1109 gen_pool_add_virt(gp_dma, (unsigned long) cpu_addr,
1110 dma_addr, PAGE_SIZE, -1);
1111 }
1112 return gp_dma;
1113}
1114
1115static void __gp_dma_free_dma(struct gen_pool *pool,
1116 struct gen_pool_chunk *chunk, void *data)
1117{
1118 size_t chunk_size = chunk->end_addr - chunk->start_addr + 1;
1119
1120 dma_free_coherent((struct device *) data, chunk_size,
1121 (void *) chunk->start_addr,
1122 (dma_addr_t) chunk->phys_addr);
1123}
1124
1125void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev)
1126{
1127 if (!gp_dma)
1128 return;
1129
1130 gen_pool_for_each_chunk(gp_dma, __gp_dma_free_dma, dma_dev);
1131 gen_pool_destroy(gp_dma);
1132}
1133
1134static int cio_dma_pool_init(void)
1135{
1136
1137 cio_dma_pool = cio_gp_dma_create(cio_get_dma_css_dev(), 1);
1138 if (!cio_dma_pool)
1139 return -ENOMEM;
1140 return 0;
1141}
1142
1143void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev,
1144 size_t size)
1145{
1146 dma_addr_t dma_addr;
1147 unsigned long addr;
1148 size_t chunk_size;
1149
1150 if (!gp_dma)
1151 return NULL;
1152 addr = gen_pool_alloc(gp_dma, size);
1153 while (!addr) {
1154 chunk_size = round_up(size, PAGE_SIZE);
1155 addr = (unsigned long) dma_alloc_coherent(dma_dev,
1156 chunk_size, &dma_addr, CIO_DMA_GFP);
1157 if (!addr)
1158 return NULL;
1159 gen_pool_add_virt(gp_dma, addr, dma_addr, chunk_size, -1);
1160 addr = gen_pool_alloc(gp_dma, size);
1161 }
1162 return (void *) addr;
1163}
1164
1165void cio_gp_dma_free(struct gen_pool *gp_dma, void *cpu_addr, size_t size)
1166{
1167 if (!cpu_addr)
1168 return;
1169 memset(cpu_addr, 0, size);
1170 gen_pool_free(gp_dma, (unsigned long) cpu_addr, size);
1171}
1172
1173
1174
1175
1176
1177
1178
1179
1180void *cio_dma_zalloc(size_t size)
1181{
1182 return cio_gp_dma_zalloc(cio_dma_pool, cio_get_dma_css_dev(), size);
1183}
1184
1185void cio_dma_free(void *cpu_addr, size_t size)
1186{
1187 cio_gp_dma_free(cio_dma_pool, cpu_addr, size);
1188}
1189
1190
1191
1192
1193
1194static int __init css_bus_init(void)
1195{
1196 int ret, i;
1197
1198 ret = chsc_init();
1199 if (ret)
1200 return ret;
1201
1202 chsc_determine_css_characteristics();
1203
1204 ret = chsc_enable_facility(CHSC_SDA_OC_MSS);
1205 if (ret)
1206 max_ssid = 0;
1207 else
1208 max_ssid = __MAX_SSID;
1209
1210 ret = slow_subchannel_init();
1211 if (ret)
1212 goto out;
1213
1214 ret = crw_register_handler(CRW_RSC_SCH, css_process_crw);
1215 if (ret)
1216 goto out;
1217
1218 if ((ret = bus_register(&css_bus_type)))
1219 goto out;
1220
1221
1222 for (i = 0; i <= MAX_CSS_IDX; i++) {
1223 ret = setup_css(i);
1224 if (ret)
1225 goto out_unregister;
1226 }
1227 ret = register_reboot_notifier(&css_reboot_notifier);
1228 if (ret)
1229 goto out_unregister;
1230 ret = register_pm_notifier(&css_power_notifier);
1231 if (ret)
1232 goto out_unregister_rn;
1233 ret = cio_dma_pool_init();
1234 if (ret)
1235 goto out_unregister_pmn;
1236 airq_init();
1237 css_init_done = 1;
1238
1239
1240 isc_register(IO_SCH_ISC);
1241
1242 return 0;
1243out_unregister_pmn:
1244 unregister_pm_notifier(&css_power_notifier);
1245out_unregister_rn:
1246 unregister_reboot_notifier(&css_reboot_notifier);
1247out_unregister:
1248 while (i-- > 0) {
1249 struct channel_subsystem *css = channel_subsystems[i];
1250 device_unregister(&css->pseudo_subchannel->dev);
1251 device_unregister(&css->device);
1252 }
1253 bus_unregister(&css_bus_type);
1254out:
1255 crw_unregister_handler(CRW_RSC_SCH);
1256 idset_free(slow_subchannel_set);
1257 chsc_init_cleanup();
1258 pr_alert("The CSS device driver initialization failed with "
1259 "errno=%d\n", ret);
1260 return ret;
1261}
1262
1263static void __init css_bus_cleanup(void)
1264{
1265 struct channel_subsystem *css;
1266
1267 for_each_css(css) {
1268 device_unregister(&css->pseudo_subchannel->dev);
1269 device_unregister(&css->device);
1270 }
1271 bus_unregister(&css_bus_type);
1272 crw_unregister_handler(CRW_RSC_SCH);
1273 idset_free(slow_subchannel_set);
1274 chsc_init_cleanup();
1275 isc_unregister(IO_SCH_ISC);
1276}
1277
1278static int __init channel_subsystem_init(void)
1279{
1280 int ret;
1281
1282 ret = css_bus_init();
1283 if (ret)
1284 return ret;
1285 cio_work_q = create_singlethread_workqueue("cio");
1286 if (!cio_work_q) {
1287 ret = -ENOMEM;
1288 goto out_bus;
1289 }
1290 ret = io_subchannel_init();
1291 if (ret)
1292 goto out_wq;
1293
1294
1295 cio_register_early_subchannels();
1296
1297 css_schedule_eval_all();
1298
1299 return ret;
1300out_wq:
1301 destroy_workqueue(cio_work_q);
1302out_bus:
1303 css_bus_cleanup();
1304 return ret;
1305}
1306subsys_initcall(channel_subsystem_init);
1307
1308static int css_settle(struct device_driver *drv, void *unused)
1309{
1310 struct css_driver *cssdrv = to_cssdriver(drv);
1311
1312 if (cssdrv->settle)
1313 return cssdrv->settle();
1314 return 0;
1315}
1316
1317int css_complete_work(void)
1318{
1319 int ret;
1320
1321
1322 ret = wait_event_interruptible(css_eval_wq,
1323 atomic_read(&css_eval_scheduled) == 0);
1324 if (ret)
1325 return -EINTR;
1326 flush_workqueue(cio_work_q);
1327
1328 return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle);
1329}
1330
1331
1332
1333
1334
1335
1336static int __init channel_subsystem_init_sync(void)
1337{
1338 css_complete_work();
1339 return 0;
1340}
1341subsys_initcall_sync(channel_subsystem_init_sync);
1342
1343void channel_subsystem_reinit(void)
1344{
1345 struct channel_path *chp;
1346 struct chp_id chpid;
1347
1348 chsc_enable_facility(CHSC_SDA_OC_MSS);
1349 chp_id_for_each(&chpid) {
1350 chp = chpid_to_chp(chpid);
1351 if (chp)
1352 chp_update_desc(chp);
1353 }
1354 cmf_reactivate();
1355}
1356
1357#ifdef CONFIG_PROC_FS
1358static ssize_t cio_settle_write(struct file *file, const char __user *buf,
1359 size_t count, loff_t *ppos)
1360{
1361 int ret;
1362
1363
1364 crw_wait_for_channel_report();
1365 ret = css_complete_work();
1366
1367 return ret ? ret : count;
1368}
1369
1370static const struct file_operations cio_settle_proc_fops = {
1371 .open = nonseekable_open,
1372 .write = cio_settle_write,
1373 .llseek = no_llseek,
1374};
1375
1376static int __init cio_settle_init(void)
1377{
1378 struct proc_dir_entry *entry;
1379
1380 entry = proc_create("cio_settle", S_IWUSR, NULL,
1381 &cio_settle_proc_fops);
1382 if (!entry)
1383 return -ENOMEM;
1384 return 0;
1385}
1386device_initcall(cio_settle_init);
1387#endif
1388
1389int sch_is_pseudo_sch(struct subchannel *sch)
1390{
1391 return sch == to_css(sch->dev.parent)->pseudo_subchannel;
1392}
1393
1394static int css_bus_match(struct device *dev, struct device_driver *drv)
1395{
1396 struct subchannel *sch = to_subchannel(dev);
1397 struct css_driver *driver = to_cssdriver(drv);
1398 struct css_device_id *id;
1399
1400
1401 if (sch->driver_override && strcmp(sch->driver_override, drv->name))
1402 return 0;
1403
1404 for (id = driver->subchannel_type; id->match_flags; id++) {
1405 if (sch->st == id->type)
1406 return 1;
1407 }
1408
1409 return 0;
1410}
1411
1412static int css_probe(struct device *dev)
1413{
1414 struct subchannel *sch;
1415 int ret;
1416
1417 sch = to_subchannel(dev);
1418 sch->driver = to_cssdriver(dev->driver);
1419 ret = sch->driver->probe ? sch->driver->probe(sch) : 0;
1420 if (ret)
1421 sch->driver = NULL;
1422 return ret;
1423}
1424
1425static int css_remove(struct device *dev)
1426{
1427 struct subchannel *sch;
1428 int ret;
1429
1430 sch = to_subchannel(dev);
1431 ret = sch->driver->remove ? sch->driver->remove(sch) : 0;
1432 sch->driver = NULL;
1433 return ret;
1434}
1435
1436static void css_shutdown(struct device *dev)
1437{
1438 struct subchannel *sch;
1439
1440 sch = to_subchannel(dev);
1441 if (sch->driver && sch->driver->shutdown)
1442 sch->driver->shutdown(sch);
1443}
1444
1445static int css_uevent(struct device *dev, struct kobj_uevent_env *env)
1446{
1447 struct subchannel *sch = to_subchannel(dev);
1448 int ret;
1449
1450 ret = add_uevent_var(env, "ST=%01X", sch->st);
1451 if (ret)
1452 return ret;
1453 ret = add_uevent_var(env, "MODALIAS=css:t%01X", sch->st);
1454 return ret;
1455}
1456
1457static int css_pm_prepare(struct device *dev)
1458{
1459 struct subchannel *sch = to_subchannel(dev);
1460 struct css_driver *drv;
1461
1462 if (mutex_is_locked(&sch->reg_mutex))
1463 return -EAGAIN;
1464 if (!sch->dev.driver)
1465 return 0;
1466 drv = to_cssdriver(sch->dev.driver);
1467
1468 return drv->prepare ? drv->prepare(sch) : 0;
1469}
1470
1471static void css_pm_complete(struct device *dev)
1472{
1473 struct subchannel *sch = to_subchannel(dev);
1474 struct css_driver *drv;
1475
1476 if (!sch->dev.driver)
1477 return;
1478 drv = to_cssdriver(sch->dev.driver);
1479 if (drv->complete)
1480 drv->complete(sch);
1481}
1482
1483static int css_pm_freeze(struct device *dev)
1484{
1485 struct subchannel *sch = to_subchannel(dev);
1486 struct css_driver *drv;
1487
1488 if (!sch->dev.driver)
1489 return 0;
1490 drv = to_cssdriver(sch->dev.driver);
1491 return drv->freeze ? drv->freeze(sch) : 0;
1492}
1493
1494static int css_pm_thaw(struct device *dev)
1495{
1496 struct subchannel *sch = to_subchannel(dev);
1497 struct css_driver *drv;
1498
1499 if (!sch->dev.driver)
1500 return 0;
1501 drv = to_cssdriver(sch->dev.driver);
1502 return drv->thaw ? drv->thaw(sch) : 0;
1503}
1504
1505static int css_pm_restore(struct device *dev)
1506{
1507 struct subchannel *sch = to_subchannel(dev);
1508 struct css_driver *drv;
1509
1510 css_update_ssd_info(sch);
1511 if (!sch->dev.driver)
1512 return 0;
1513 drv = to_cssdriver(sch->dev.driver);
1514 return drv->restore ? drv->restore(sch) : 0;
1515}
1516
1517static const struct dev_pm_ops css_pm_ops = {
1518 .prepare = css_pm_prepare,
1519 .complete = css_pm_complete,
1520 .freeze = css_pm_freeze,
1521 .thaw = css_pm_thaw,
1522 .restore = css_pm_restore,
1523};
1524
1525static struct bus_type css_bus_type = {
1526 .name = "css",
1527 .match = css_bus_match,
1528 .probe = css_probe,
1529 .remove = css_remove,
1530 .shutdown = css_shutdown,
1531 .uevent = css_uevent,
1532 .pm = &css_pm_ops,
1533};
1534
1535
1536
1537
1538
1539
1540
1541
1542int css_driver_register(struct css_driver *cdrv)
1543{
1544 cdrv->drv.bus = &css_bus_type;
1545 return driver_register(&cdrv->drv);
1546}
1547EXPORT_SYMBOL_GPL(css_driver_register);
1548
1549
1550
1551
1552
1553
1554
1555void css_driver_unregister(struct css_driver *cdrv)
1556{
1557 driver_unregister(&cdrv->drv);
1558}
1559EXPORT_SYMBOL_GPL(css_driver_unregister);
1560