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15#define KMSG_COMPONENT "dasd"
16
17#include <linux/ctype.h>
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/slab.h>
21
22#include <asm/debug.h>
23#include <asm/uaccess.h>
24#include <asm/ipl.h>
25
26
27#define PRINTK_HEADER "dasd_devmap:"
28#define DASD_BUS_ID_SIZE 20
29
30#include "dasd_int.h"
31
32struct kmem_cache *dasd_page_cache;
33EXPORT_SYMBOL_GPL(dasd_page_cache);
34
35
36
37
38
39
40
41
42
43
44
45struct dasd_devmap {
46 struct list_head list;
47 char bus_id[DASD_BUS_ID_SIZE];
48 unsigned int devindex;
49 unsigned short features;
50 struct dasd_device *device;
51};
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67int dasd_probeonly = 0;
68int dasd_autodetect = 0;
69int dasd_nopav = 0;
70EXPORT_SYMBOL_GPL(dasd_nopav);
71int dasd_nofcx;
72EXPORT_SYMBOL_GPL(dasd_nofcx);
73
74
75
76
77
78
79static char *dasd[256];
80module_param_array(dasd, charp, NULL, 0);
81
82
83
84
85static DEFINE_SPINLOCK(dasd_devmap_lock);
86
87
88
89
90static struct list_head dasd_hashlists[256];
91int dasd_max_devindex;
92
93static struct dasd_devmap *dasd_add_busid(const char *, int);
94
95static inline int
96dasd_hash_busid(const char *bus_id)
97{
98 int hash, i;
99
100 hash = 0;
101 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
102 hash += *bus_id;
103 return hash & 0xff;
104}
105
106#ifndef MODULE
107
108
109
110
111
112static int __init
113dasd_call_setup(char *str)
114{
115 static int count = 0;
116
117 if (count < 256)
118 dasd[count++] = str;
119 return 1;
120}
121
122__setup ("dasd=", dasd_call_setup);
123#endif
124
125#define DASD_IPLDEV "ipldev"
126
127
128
129
130static int
131
132dasd_busid(char **str, int *id0, int *id1, int *devno)
133{
134 int val, old_style;
135
136
137 if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
138 if (ipl_info.type != IPL_TYPE_CCW) {
139 pr_err("The IPL device is not a CCW device\n");
140 return -EINVAL;
141 }
142 *id0 = 0;
143 *id1 = ipl_info.data.ccw.dev_id.ssid;
144 *devno = ipl_info.data.ccw.dev_id.devno;
145 *str += strlen(DASD_IPLDEV);
146
147 return 0;
148 }
149
150 old_style = 0;
151 if ((*str)[0] == '0' && (*str)[1] == 'x') {
152 *str += 2;
153 old_style = 1;
154 }
155 if (!isxdigit((*str)[0]))
156 return -EINVAL;
157 val = simple_strtoul(*str, str, 16);
158 if (old_style || (*str)[0] != '.') {
159 *id0 = *id1 = 0;
160 if (val < 0 || val > 0xffff)
161 return -EINVAL;
162 *devno = val;
163 return 0;
164 }
165
166 if (val < 0 || val > 0xff)
167 return -EINVAL;
168 *id0 = val;
169 (*str)++;
170 if (!isxdigit((*str)[0]))
171 return -EINVAL;
172 val = simple_strtoul(*str, str, 16);
173 if (val < 0 || val > 0xff || (*str)++[0] != '.')
174 return -EINVAL;
175 *id1 = val;
176 if (!isxdigit((*str)[0]))
177 return -EINVAL;
178 val = simple_strtoul(*str, str, 16);
179 if (val < 0 || val > 0xffff)
180 return -EINVAL;
181 *devno = val;
182 return 0;
183}
184
185
186
187
188
189
190static int
191dasd_feature_list(char *str, char **endp)
192{
193 int features, len, rc;
194
195 rc = 0;
196 if (*str != '(') {
197 *endp = str;
198 return DASD_FEATURE_DEFAULT;
199 }
200 str++;
201 features = 0;
202
203 while (1) {
204 for (len = 0;
205 str[len] && str[len] != ':' && str[len] != ')'; len++);
206 if (len == 2 && !strncmp(str, "ro", 2))
207 features |= DASD_FEATURE_READONLY;
208 else if (len == 4 && !strncmp(str, "diag", 4))
209 features |= DASD_FEATURE_USEDIAG;
210 else if (len == 3 && !strncmp(str, "raw", 3))
211 features |= DASD_FEATURE_USERAW;
212 else if (len == 6 && !strncmp(str, "erplog", 6))
213 features |= DASD_FEATURE_ERPLOG;
214 else if (len == 8 && !strncmp(str, "failfast", 8))
215 features |= DASD_FEATURE_FAILFAST;
216 else {
217 pr_warning("%*s is not a supported device option\n",
218 len, str);
219 rc = -EINVAL;
220 }
221 str += len;
222 if (*str != ':')
223 break;
224 str++;
225 }
226 if (*str != ')') {
227 pr_warning("A closing parenthesis ')' is missing in the "
228 "dasd= parameter\n");
229 rc = -EINVAL;
230 } else
231 str++;
232 *endp = str;
233 if (rc != 0)
234 return rc;
235 return features;
236}
237
238
239
240
241
242
243
244static char *
245dasd_parse_keyword( char *parsestring ) {
246
247 char *nextcomma, *residual_str;
248 int length;
249
250 nextcomma = strchr(parsestring,',');
251 if (nextcomma) {
252 length = nextcomma - parsestring;
253 residual_str = nextcomma + 1;
254 } else {
255 length = strlen(parsestring);
256 residual_str = parsestring + length;
257 }
258 if (strncmp("autodetect", parsestring, length) == 0) {
259 dasd_autodetect = 1;
260 pr_info("The autodetection mode has been activated\n");
261 return residual_str;
262 }
263 if (strncmp("probeonly", parsestring, length) == 0) {
264 dasd_probeonly = 1;
265 pr_info("The probeonly mode has been activated\n");
266 return residual_str;
267 }
268 if (strncmp("nopav", parsestring, length) == 0) {
269 if (MACHINE_IS_VM)
270 pr_info("'nopav' is not supported on z/VM\n");
271 else {
272 dasd_nopav = 1;
273 pr_info("PAV support has be deactivated\n");
274 }
275 return residual_str;
276 }
277 if (strncmp("nofcx", parsestring, length) == 0) {
278 dasd_nofcx = 1;
279 pr_info("High Performance FICON support has been "
280 "deactivated\n");
281 return residual_str;
282 }
283 if (strncmp("fixedbuffers", parsestring, length) == 0) {
284 if (dasd_page_cache)
285 return residual_str;
286 dasd_page_cache =
287 kmem_cache_create("dasd_page_cache", PAGE_SIZE,
288 PAGE_SIZE, SLAB_CACHE_DMA,
289 NULL);
290 if (!dasd_page_cache)
291 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
292 "fixed buffer mode disabled.");
293 else
294 DBF_EVENT(DBF_INFO, "%s",
295 "turning on fixed buffer mode");
296 return residual_str;
297 }
298 return ERR_PTR(-EINVAL);
299}
300
301
302
303
304
305
306
307
308static char *
309dasd_parse_range( char *parsestring ) {
310
311 struct dasd_devmap *devmap;
312 int from, from_id0, from_id1;
313 int to, to_id0, to_id1;
314 int features, rc;
315 char bus_id[DASD_BUS_ID_SIZE+1], *str;
316
317 str = parsestring;
318 rc = dasd_busid(&str, &from_id0, &from_id1, &from);
319 if (rc == 0) {
320 to = from;
321 to_id0 = from_id0;
322 to_id1 = from_id1;
323 if (*str == '-') {
324 str++;
325 rc = dasd_busid(&str, &to_id0, &to_id1, &to);
326 }
327 }
328 if (rc == 0 &&
329 (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
330 rc = -EINVAL;
331 if (rc) {
332 pr_err("%s is not a valid device range\n", parsestring);
333 return ERR_PTR(rc);
334 }
335 features = dasd_feature_list(str, &str);
336 if (features < 0)
337 return ERR_PTR(-EINVAL);
338
339 features |= DASD_FEATURE_INITIAL_ONLINE;
340 while (from <= to) {
341 sprintf(bus_id, "%01x.%01x.%04x",
342 from_id0, from_id1, from++);
343 devmap = dasd_add_busid(bus_id, features);
344 if (IS_ERR(devmap))
345 return (char *)devmap;
346 }
347 if (*str == ',')
348 return str + 1;
349 if (*str == '\0')
350 return str;
351 pr_warning("The dasd= parameter value %s has an invalid ending\n",
352 str);
353 return ERR_PTR(-EINVAL);
354}
355
356static char *
357dasd_parse_next_element( char *parsestring ) {
358 char * residual_str;
359 residual_str = dasd_parse_keyword(parsestring);
360 if (!IS_ERR(residual_str))
361 return residual_str;
362 residual_str = dasd_parse_range(parsestring);
363 return residual_str;
364}
365
366
367
368
369
370
371
372
373
374int
375dasd_parse(void)
376{
377 int rc, i;
378 char *parsestring;
379
380 rc = 0;
381 for (i = 0; i < 256; i++) {
382 if (dasd[i] == NULL)
383 break;
384 parsestring = dasd[i];
385
386 while (*parsestring) {
387 parsestring = dasd_parse_next_element(parsestring);
388 if(IS_ERR(parsestring)) {
389 rc = PTR_ERR(parsestring);
390 break;
391 }
392 }
393 if (rc) {
394 DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
395 break;
396 }
397 }
398 return rc;
399}
400
401
402
403
404
405
406
407static struct dasd_devmap *
408dasd_add_busid(const char *bus_id, int features)
409{
410 struct dasd_devmap *devmap, *new, *tmp;
411 int hash;
412
413 new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
414 if (!new)
415 return ERR_PTR(-ENOMEM);
416 spin_lock(&dasd_devmap_lock);
417 devmap = NULL;
418 hash = dasd_hash_busid(bus_id);
419 list_for_each_entry(tmp, &dasd_hashlists[hash], list)
420 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
421 devmap = tmp;
422 break;
423 }
424 if (!devmap) {
425
426 new->devindex = dasd_max_devindex++;
427 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
428 new->features = features;
429 new->device = NULL;
430 list_add(&new->list, &dasd_hashlists[hash]);
431 devmap = new;
432 new = NULL;
433 }
434 spin_unlock(&dasd_devmap_lock);
435 kfree(new);
436 return devmap;
437}
438
439
440
441
442static struct dasd_devmap *
443dasd_find_busid(const char *bus_id)
444{
445 struct dasd_devmap *devmap, *tmp;
446 int hash;
447
448 spin_lock(&dasd_devmap_lock);
449 devmap = ERR_PTR(-ENODEV);
450 hash = dasd_hash_busid(bus_id);
451 list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
452 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
453 devmap = tmp;
454 break;
455 }
456 }
457 spin_unlock(&dasd_devmap_lock);
458 return devmap;
459}
460
461
462
463
464int
465dasd_busid_known(const char *bus_id)
466{
467 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
468}
469
470
471
472
473
474static void
475dasd_forget_ranges(void)
476{
477 struct dasd_devmap *devmap, *n;
478 int i;
479
480 spin_lock(&dasd_devmap_lock);
481 for (i = 0; i < 256; i++) {
482 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
483 BUG_ON(devmap->device != NULL);
484 list_del(&devmap->list);
485 kfree(devmap);
486 }
487 }
488 spin_unlock(&dasd_devmap_lock);
489}
490
491
492
493
494struct dasd_device *
495dasd_device_from_devindex(int devindex)
496{
497 struct dasd_devmap *devmap, *tmp;
498 struct dasd_device *device;
499 int i;
500
501 spin_lock(&dasd_devmap_lock);
502 devmap = NULL;
503 for (i = 0; (i < 256) && !devmap; i++)
504 list_for_each_entry(tmp, &dasd_hashlists[i], list)
505 if (tmp->devindex == devindex) {
506
507 devmap = tmp;
508 break;
509 }
510 if (devmap && devmap->device) {
511 device = devmap->device;
512 dasd_get_device(device);
513 } else
514 device = ERR_PTR(-ENODEV);
515 spin_unlock(&dasd_devmap_lock);
516 return device;
517}
518
519
520
521
522
523static struct dasd_devmap *
524dasd_devmap_from_cdev(struct ccw_device *cdev)
525{
526 struct dasd_devmap *devmap;
527
528 devmap = dasd_find_busid(dev_name(&cdev->dev));
529 if (IS_ERR(devmap))
530 devmap = dasd_add_busid(dev_name(&cdev->dev),
531 DASD_FEATURE_DEFAULT);
532 return devmap;
533}
534
535
536
537
538struct dasd_device *
539dasd_create_device(struct ccw_device *cdev)
540{
541 struct dasd_devmap *devmap;
542 struct dasd_device *device;
543 unsigned long flags;
544 int rc;
545
546 devmap = dasd_devmap_from_cdev(cdev);
547 if (IS_ERR(devmap))
548 return (void *) devmap;
549
550 device = dasd_alloc_device();
551 if (IS_ERR(device))
552 return device;
553 atomic_set(&device->ref_count, 3);
554
555 spin_lock(&dasd_devmap_lock);
556 if (!devmap->device) {
557 devmap->device = device;
558 device->devindex = devmap->devindex;
559 device->features = devmap->features;
560 get_device(&cdev->dev);
561 device->cdev = cdev;
562 rc = 0;
563 } else
564
565 rc = -EBUSY;
566 spin_unlock(&dasd_devmap_lock);
567
568 if (rc) {
569 dasd_free_device(device);
570 return ERR_PTR(rc);
571 }
572
573 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
574 dev_set_drvdata(&cdev->dev, device);
575 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
576
577 return device;
578}
579
580
581
582
583static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
584
585
586
587
588
589void
590dasd_delete_device(struct dasd_device *device)
591{
592 struct ccw_device *cdev;
593 struct dasd_devmap *devmap;
594 unsigned long flags;
595
596
597 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
598 BUG_ON(IS_ERR(devmap));
599 spin_lock(&dasd_devmap_lock);
600 if (devmap->device != device) {
601 spin_unlock(&dasd_devmap_lock);
602 dasd_put_device(device);
603 return;
604 }
605 devmap->device = NULL;
606 spin_unlock(&dasd_devmap_lock);
607
608
609 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
610 dev_set_drvdata(&device->cdev->dev, NULL);
611 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
612
613
614
615
616
617 atomic_sub(3, &device->ref_count);
618
619
620 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
621
622
623 cdev = device->cdev;
624 device->cdev = NULL;
625
626
627 put_device(&cdev->dev);
628
629
630 dasd_free_device(device);
631}
632
633
634
635
636
637void
638dasd_put_device_wake(struct dasd_device *device)
639{
640 wake_up(&dasd_delete_wq);
641}
642EXPORT_SYMBOL_GPL(dasd_put_device_wake);
643
644
645
646
647
648
649struct dasd_device *
650dasd_device_from_cdev_locked(struct ccw_device *cdev)
651{
652 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
653
654 if (!device)
655 return ERR_PTR(-ENODEV);
656 dasd_get_device(device);
657 return device;
658}
659
660
661
662
663struct dasd_device *
664dasd_device_from_cdev(struct ccw_device *cdev)
665{
666 struct dasd_device *device;
667 unsigned long flags;
668
669 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
670 device = dasd_device_from_cdev_locked(cdev);
671 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
672 return device;
673}
674
675void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
676{
677 struct dasd_devmap *devmap;
678
679 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
680 if (IS_ERR(devmap))
681 return;
682 spin_lock(&dasd_devmap_lock);
683 gdp->private_data = devmap;
684 spin_unlock(&dasd_devmap_lock);
685}
686
687struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
688{
689 struct dasd_device *device;
690 struct dasd_devmap *devmap;
691
692 if (!gdp->private_data)
693 return NULL;
694 device = NULL;
695 spin_lock(&dasd_devmap_lock);
696 devmap = gdp->private_data;
697 if (devmap && devmap->device) {
698 device = devmap->device;
699 dasd_get_device(device);
700 }
701 spin_unlock(&dasd_devmap_lock);
702 return device;
703}
704
705
706
707
708
709
710
711
712static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
713 char *buf)
714{
715 struct dasd_devmap *devmap;
716 int ff_flag;
717
718 devmap = dasd_find_busid(dev_name(dev));
719 if (!IS_ERR(devmap))
720 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
721 else
722 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
723 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
724}
725
726static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
727 const char *buf, size_t count)
728{
729 struct dasd_devmap *devmap;
730 int val;
731 char *endp;
732
733 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
734 if (IS_ERR(devmap))
735 return PTR_ERR(devmap);
736
737 val = simple_strtoul(buf, &endp, 0);
738 if (((endp + 1) < (buf + count)) || (val > 1))
739 return -EINVAL;
740
741 spin_lock(&dasd_devmap_lock);
742 if (val)
743 devmap->features |= DASD_FEATURE_FAILFAST;
744 else
745 devmap->features &= ~DASD_FEATURE_FAILFAST;
746 if (devmap->device)
747 devmap->device->features = devmap->features;
748 spin_unlock(&dasd_devmap_lock);
749 return count;
750}
751
752static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
753
754
755
756
757static ssize_t
758dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
759{
760 struct dasd_devmap *devmap;
761 int ro_flag;
762
763 devmap = dasd_find_busid(dev_name(dev));
764 if (!IS_ERR(devmap))
765 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
766 else
767 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
768 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
769}
770
771static ssize_t
772dasd_ro_store(struct device *dev, struct device_attribute *attr,
773 const char *buf, size_t count)
774{
775 struct dasd_devmap *devmap;
776 struct dasd_device *device;
777 int val;
778 char *endp;
779
780 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
781 if (IS_ERR(devmap))
782 return PTR_ERR(devmap);
783
784 val = simple_strtoul(buf, &endp, 0);
785 if (((endp + 1) < (buf + count)) || (val > 1))
786 return -EINVAL;
787
788 spin_lock(&dasd_devmap_lock);
789 if (val)
790 devmap->features |= DASD_FEATURE_READONLY;
791 else
792 devmap->features &= ~DASD_FEATURE_READONLY;
793 device = devmap->device;
794 if (device) {
795 device->features = devmap->features;
796 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
797 }
798 spin_unlock(&dasd_devmap_lock);
799 if (device && device->block && device->block->gdp)
800 set_disk_ro(device->block->gdp, val);
801 return count;
802}
803
804static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
805
806
807
808
809static ssize_t
810dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
811{
812 struct dasd_devmap *devmap;
813 int erplog;
814
815 devmap = dasd_find_busid(dev_name(dev));
816 if (!IS_ERR(devmap))
817 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
818 else
819 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
820 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
821}
822
823static ssize_t
824dasd_erplog_store(struct device *dev, struct device_attribute *attr,
825 const char *buf, size_t count)
826{
827 struct dasd_devmap *devmap;
828 int val;
829 char *endp;
830
831 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
832 if (IS_ERR(devmap))
833 return PTR_ERR(devmap);
834
835 val = simple_strtoul(buf, &endp, 0);
836 if (((endp + 1) < (buf + count)) || (val > 1))
837 return -EINVAL;
838
839 spin_lock(&dasd_devmap_lock);
840 if (val)
841 devmap->features |= DASD_FEATURE_ERPLOG;
842 else
843 devmap->features &= ~DASD_FEATURE_ERPLOG;
844 if (devmap->device)
845 devmap->device->features = devmap->features;
846 spin_unlock(&dasd_devmap_lock);
847 return count;
848}
849
850static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
851
852
853
854
855
856static ssize_t
857dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
858{
859 struct dasd_devmap *devmap;
860 int use_diag;
861
862 devmap = dasd_find_busid(dev_name(dev));
863 if (!IS_ERR(devmap))
864 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
865 else
866 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
867 return sprintf(buf, use_diag ? "1\n" : "0\n");
868}
869
870static ssize_t
871dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
872 const char *buf, size_t count)
873{
874 struct dasd_devmap *devmap;
875 ssize_t rc;
876 int val;
877 char *endp;
878
879 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
880 if (IS_ERR(devmap))
881 return PTR_ERR(devmap);
882
883 val = simple_strtoul(buf, &endp, 0);
884 if (((endp + 1) < (buf + count)) || (val > 1))
885 return -EINVAL;
886
887 spin_lock(&dasd_devmap_lock);
888
889 rc = count;
890 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
891 if (val)
892 devmap->features |= DASD_FEATURE_USEDIAG;
893 else
894 devmap->features &= ~DASD_FEATURE_USEDIAG;
895 } else
896 rc = -EPERM;
897 spin_unlock(&dasd_devmap_lock);
898 return rc;
899}
900
901static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
902
903
904
905
906
907static ssize_t
908dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
909{
910 struct dasd_devmap *devmap;
911 int use_raw;
912
913 devmap = dasd_find_busid(dev_name(dev));
914 if (!IS_ERR(devmap))
915 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
916 else
917 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
918 return sprintf(buf, use_raw ? "1\n" : "0\n");
919}
920
921static ssize_t
922dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
923 const char *buf, size_t count)
924{
925 struct dasd_devmap *devmap;
926 ssize_t rc;
927 unsigned long val;
928
929 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
930 if (IS_ERR(devmap))
931 return PTR_ERR(devmap);
932
933 if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
934 return -EINVAL;
935
936 spin_lock(&dasd_devmap_lock);
937
938 rc = count;
939 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
940 if (val)
941 devmap->features |= DASD_FEATURE_USERAW;
942 else
943 devmap->features &= ~DASD_FEATURE_USERAW;
944 } else
945 rc = -EPERM;
946 spin_unlock(&dasd_devmap_lock);
947 return rc;
948}
949
950static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
951 dasd_use_raw_store);
952
953static ssize_t
954dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
955 const char *buf, size_t count)
956{
957 struct ccw_device *cdev = to_ccwdev(dev);
958 struct dasd_device *device;
959 int rc;
960
961 device = dasd_device_from_cdev(cdev);
962 if (IS_ERR(device)) {
963 rc = PTR_ERR(device);
964 goto out;
965 }
966
967 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
968 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
969
970 dasd_put_device(device);
971 rc = -EBUSY;
972 goto out;
973 }
974
975 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
976 dasd_put_device(device);
977
978 rc = ccw_device_set_offline(cdev);
979
980out:
981 return rc ? rc : count;
982}
983
984static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
985
986static ssize_t
987dasd_discipline_show(struct device *dev, struct device_attribute *attr,
988 char *buf)
989{
990 struct dasd_device *device;
991 ssize_t len;
992
993 device = dasd_device_from_cdev(to_ccwdev(dev));
994 if (IS_ERR(device))
995 goto out;
996 else if (!device->discipline) {
997 dasd_put_device(device);
998 goto out;
999 } else {
1000 len = snprintf(buf, PAGE_SIZE, "%s\n",
1001 device->discipline->name);
1002 dasd_put_device(device);
1003 return len;
1004 }
1005out:
1006 len = snprintf(buf, PAGE_SIZE, "none\n");
1007 return len;
1008}
1009
1010static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1011
1012static ssize_t
1013dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1014 char *buf)
1015{
1016 struct dasd_device *device;
1017 ssize_t len;
1018
1019 device = dasd_device_from_cdev(to_ccwdev(dev));
1020 if (!IS_ERR(device)) {
1021 switch (device->state) {
1022 case DASD_STATE_NEW:
1023 len = snprintf(buf, PAGE_SIZE, "new\n");
1024 break;
1025 case DASD_STATE_KNOWN:
1026 len = snprintf(buf, PAGE_SIZE, "detected\n");
1027 break;
1028 case DASD_STATE_BASIC:
1029 len = snprintf(buf, PAGE_SIZE, "basic\n");
1030 break;
1031 case DASD_STATE_UNFMT:
1032 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1033 break;
1034 case DASD_STATE_READY:
1035 len = snprintf(buf, PAGE_SIZE, "ready\n");
1036 break;
1037 case DASD_STATE_ONLINE:
1038 len = snprintf(buf, PAGE_SIZE, "online\n");
1039 break;
1040 default:
1041 len = snprintf(buf, PAGE_SIZE, "no stat\n");
1042 break;
1043 }
1044 dasd_put_device(device);
1045 } else
1046 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1047 return len;
1048}
1049
1050static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1051
1052static ssize_t dasd_alias_show(struct device *dev,
1053 struct device_attribute *attr, char *buf)
1054{
1055 struct dasd_device *device;
1056 struct dasd_uid uid;
1057
1058 device = dasd_device_from_cdev(to_ccwdev(dev));
1059 if (IS_ERR(device))
1060 return sprintf(buf, "0\n");
1061
1062 if (device->discipline && device->discipline->get_uid &&
1063 !device->discipline->get_uid(device, &uid)) {
1064 if (uid.type == UA_BASE_PAV_ALIAS ||
1065 uid.type == UA_HYPER_PAV_ALIAS) {
1066 dasd_put_device(device);
1067 return sprintf(buf, "1\n");
1068 }
1069 }
1070 dasd_put_device(device);
1071
1072 return sprintf(buf, "0\n");
1073}
1074
1075static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1076
1077static ssize_t dasd_vendor_show(struct device *dev,
1078 struct device_attribute *attr, char *buf)
1079{
1080 struct dasd_device *device;
1081 struct dasd_uid uid;
1082 char *vendor;
1083
1084 device = dasd_device_from_cdev(to_ccwdev(dev));
1085 vendor = "";
1086 if (IS_ERR(device))
1087 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1088
1089 if (device->discipline && device->discipline->get_uid &&
1090 !device->discipline->get_uid(device, &uid))
1091 vendor = uid.vendor;
1092
1093 dasd_put_device(device);
1094
1095 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1096}
1097
1098static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1099
1100#define UID_STRLEN ( 3 + 1 + 14 + 1 +\
1101 4 + 1 + 2 + 1 +\
1102 32 + 1)
1103
1104static ssize_t
1105dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1106{
1107 struct dasd_device *device;
1108 struct dasd_uid uid;
1109 char uid_string[UID_STRLEN];
1110 char ua_string[3];
1111
1112 device = dasd_device_from_cdev(to_ccwdev(dev));
1113 uid_string[0] = 0;
1114 if (IS_ERR(device))
1115 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1116
1117 if (device->discipline && device->discipline->get_uid &&
1118 !device->discipline->get_uid(device, &uid)) {
1119 switch (uid.type) {
1120 case UA_BASE_DEVICE:
1121 snprintf(ua_string, sizeof(ua_string), "%02x",
1122 uid.real_unit_addr);
1123 break;
1124 case UA_BASE_PAV_ALIAS:
1125 snprintf(ua_string, sizeof(ua_string), "%02x",
1126 uid.base_unit_addr);
1127 break;
1128 case UA_HYPER_PAV_ALIAS:
1129 snprintf(ua_string, sizeof(ua_string), "xx");
1130 break;
1131 default:
1132
1133 snprintf(ua_string, sizeof(ua_string), "%02x",
1134 uid.real_unit_addr);
1135 break;
1136 }
1137
1138 if (strlen(uid.vduit) > 0)
1139 snprintf(uid_string, sizeof(uid_string),
1140 "%s.%s.%04x.%s.%s",
1141 uid.vendor, uid.serial, uid.ssid, ua_string,
1142 uid.vduit);
1143 else
1144 snprintf(uid_string, sizeof(uid_string),
1145 "%s.%s.%04x.%s",
1146 uid.vendor, uid.serial, uid.ssid, ua_string);
1147 }
1148 dasd_put_device(device);
1149
1150 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1151}
1152static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1153
1154
1155
1156
1157static ssize_t
1158dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1159{
1160 struct dasd_devmap *devmap;
1161 int eer_flag;
1162
1163 devmap = dasd_find_busid(dev_name(dev));
1164 if (!IS_ERR(devmap) && devmap->device)
1165 eer_flag = dasd_eer_enabled(devmap->device);
1166 else
1167 eer_flag = 0;
1168 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1169}
1170
1171static ssize_t
1172dasd_eer_store(struct device *dev, struct device_attribute *attr,
1173 const char *buf, size_t count)
1174{
1175 struct dasd_devmap *devmap;
1176 int val, rc;
1177 char *endp;
1178
1179 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1180 if (IS_ERR(devmap))
1181 return PTR_ERR(devmap);
1182 if (!devmap->device)
1183 return -ENODEV;
1184
1185 val = simple_strtoul(buf, &endp, 0);
1186 if (((endp + 1) < (buf + count)) || (val > 1))
1187 return -EINVAL;
1188
1189 if (val) {
1190 rc = dasd_eer_enable(devmap->device);
1191 if (rc)
1192 return rc;
1193 } else
1194 dasd_eer_disable(devmap->device);
1195 return count;
1196}
1197
1198static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1199
1200
1201
1202
1203static ssize_t
1204dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1205{
1206 struct dasd_device *device;
1207 int len;
1208
1209 device = dasd_device_from_cdev(to_ccwdev(dev));
1210 if (IS_ERR(device))
1211 return -ENODEV;
1212 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1213 dasd_put_device(device);
1214 return len;
1215}
1216
1217static ssize_t
1218dasd_expires_store(struct device *dev, struct device_attribute *attr,
1219 const char *buf, size_t count)
1220{
1221 struct dasd_device *device;
1222 unsigned long val;
1223
1224 device = dasd_device_from_cdev(to_ccwdev(dev));
1225 if (IS_ERR(device))
1226 return -ENODEV;
1227
1228 if ((kstrtoul(buf, 10, &val) != 0) ||
1229 (val > DASD_EXPIRES_MAX) || val == 0) {
1230 dasd_put_device(device);
1231 return -EINVAL;
1232 }
1233
1234 if (val)
1235 device->default_expires = val;
1236
1237 dasd_put_device(device);
1238 return count;
1239}
1240
1241static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1242
1243static ssize_t
1244dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1245{
1246 struct dasd_device *device;
1247 int len;
1248
1249 device = dasd_device_from_cdev(to_ccwdev(dev));
1250 if (IS_ERR(device))
1251 return -ENODEV;
1252 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1253 dasd_put_device(device);
1254 return len;
1255}
1256
1257static ssize_t
1258dasd_retries_store(struct device *dev, struct device_attribute *attr,
1259 const char *buf, size_t count)
1260{
1261 struct dasd_device *device;
1262 unsigned long val;
1263
1264 device = dasd_device_from_cdev(to_ccwdev(dev));
1265 if (IS_ERR(device))
1266 return -ENODEV;
1267
1268 if ((kstrtoul(buf, 10, &val) != 0) ||
1269 (val > DASD_RETRIES_MAX)) {
1270 dasd_put_device(device);
1271 return -EINVAL;
1272 }
1273
1274 if (val)
1275 device->default_retries = val;
1276
1277 dasd_put_device(device);
1278 return count;
1279}
1280
1281static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1282
1283static ssize_t
1284dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1285 char *buf)
1286{
1287 struct dasd_device *device;
1288 int len;
1289
1290 device = dasd_device_from_cdev(to_ccwdev(dev));
1291 if (IS_ERR(device))
1292 return -ENODEV;
1293 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1294 dasd_put_device(device);
1295 return len;
1296}
1297
1298static ssize_t
1299dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1300 const char *buf, size_t count)
1301{
1302 struct dasd_device *device;
1303 struct request_queue *q;
1304 unsigned long val, flags;
1305
1306 device = dasd_device_from_cdev(to_ccwdev(dev));
1307 if (IS_ERR(device) || !device->block)
1308 return -ENODEV;
1309
1310 if ((kstrtoul(buf, 10, &val) != 0) ||
1311 val > UINT_MAX / HZ) {
1312 dasd_put_device(device);
1313 return -EINVAL;
1314 }
1315 q = device->block->request_queue;
1316 if (!q) {
1317 dasd_put_device(device);
1318 return -ENODEV;
1319 }
1320 spin_lock_irqsave(&device->block->request_queue_lock, flags);
1321 if (!val)
1322 blk_queue_rq_timed_out(q, NULL);
1323 else
1324 blk_queue_rq_timed_out(q, dasd_times_out);
1325
1326 device->blk_timeout = val;
1327
1328 blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1329 spin_unlock_irqrestore(&device->block->request_queue_lock, flags);
1330
1331 dasd_put_device(device);
1332 return count;
1333}
1334
1335static DEVICE_ATTR(timeout, 0644,
1336 dasd_timeout_show, dasd_timeout_store);
1337
1338static ssize_t dasd_reservation_policy_show(struct device *dev,
1339 struct device_attribute *attr,
1340 char *buf)
1341{
1342 struct dasd_devmap *devmap;
1343 int rc = 0;
1344
1345 devmap = dasd_find_busid(dev_name(dev));
1346 if (IS_ERR(devmap)) {
1347 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1348 } else {
1349 spin_lock(&dasd_devmap_lock);
1350 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1351 rc = snprintf(buf, PAGE_SIZE, "fail\n");
1352 else
1353 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1354 spin_unlock(&dasd_devmap_lock);
1355 }
1356 return rc;
1357}
1358
1359static ssize_t dasd_reservation_policy_store(struct device *dev,
1360 struct device_attribute *attr,
1361 const char *buf, size_t count)
1362{
1363 struct dasd_devmap *devmap;
1364 int rc;
1365
1366 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1367 if (IS_ERR(devmap))
1368 return PTR_ERR(devmap);
1369 rc = 0;
1370 spin_lock(&dasd_devmap_lock);
1371 if (sysfs_streq("ignore", buf))
1372 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1373 else if (sysfs_streq("fail", buf))
1374 devmap->features |= DASD_FEATURE_FAILONSLCK;
1375 else
1376 rc = -EINVAL;
1377 if (devmap->device)
1378 devmap->device->features = devmap->features;
1379 spin_unlock(&dasd_devmap_lock);
1380 if (rc)
1381 return rc;
1382 else
1383 return count;
1384}
1385
1386static DEVICE_ATTR(reservation_policy, 0644,
1387 dasd_reservation_policy_show, dasd_reservation_policy_store);
1388
1389static ssize_t dasd_reservation_state_show(struct device *dev,
1390 struct device_attribute *attr,
1391 char *buf)
1392{
1393 struct dasd_device *device;
1394 int rc = 0;
1395
1396 device = dasd_device_from_cdev(to_ccwdev(dev));
1397 if (IS_ERR(device))
1398 return snprintf(buf, PAGE_SIZE, "none\n");
1399
1400 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1401 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1402 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1403 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1404 else
1405 rc = snprintf(buf, PAGE_SIZE, "none\n");
1406 dasd_put_device(device);
1407 return rc;
1408}
1409
1410static ssize_t dasd_reservation_state_store(struct device *dev,
1411 struct device_attribute *attr,
1412 const char *buf, size_t count)
1413{
1414 struct dasd_device *device;
1415 int rc = 0;
1416
1417 device = dasd_device_from_cdev(to_ccwdev(dev));
1418 if (IS_ERR(device))
1419 return -ENODEV;
1420 if (sysfs_streq("reset", buf))
1421 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1422 else
1423 rc = -EINVAL;
1424 dasd_put_device(device);
1425
1426 if (rc)
1427 return rc;
1428 else
1429 return count;
1430}
1431
1432static DEVICE_ATTR(last_known_reservation_state, 0644,
1433 dasd_reservation_state_show, dasd_reservation_state_store);
1434
1435static struct attribute * dasd_attrs[] = {
1436 &dev_attr_readonly.attr,
1437 &dev_attr_discipline.attr,
1438 &dev_attr_status.attr,
1439 &dev_attr_alias.attr,
1440 &dev_attr_vendor.attr,
1441 &dev_attr_uid.attr,
1442 &dev_attr_use_diag.attr,
1443 &dev_attr_raw_track_access.attr,
1444 &dev_attr_eer_enabled.attr,
1445 &dev_attr_erplog.attr,
1446 &dev_attr_failfast.attr,
1447 &dev_attr_expires.attr,
1448 &dev_attr_retries.attr,
1449 &dev_attr_timeout.attr,
1450 &dev_attr_reservation_policy.attr,
1451 &dev_attr_last_known_reservation_state.attr,
1452 &dev_attr_safe_offline.attr,
1453 NULL,
1454};
1455
1456static struct attribute_group dasd_attr_group = {
1457 .attrs = dasd_attrs,
1458};
1459
1460
1461
1462
1463int
1464dasd_get_feature(struct ccw_device *cdev, int feature)
1465{
1466 struct dasd_devmap *devmap;
1467
1468 devmap = dasd_find_busid(dev_name(&cdev->dev));
1469 if (IS_ERR(devmap))
1470 return PTR_ERR(devmap);
1471
1472 return ((devmap->features & feature) != 0);
1473}
1474
1475
1476
1477
1478
1479int
1480dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1481{
1482 struct dasd_devmap *devmap;
1483
1484 devmap = dasd_find_busid(dev_name(&cdev->dev));
1485 if (IS_ERR(devmap))
1486 return PTR_ERR(devmap);
1487
1488 spin_lock(&dasd_devmap_lock);
1489 if (flag)
1490 devmap->features |= feature;
1491 else
1492 devmap->features &= ~feature;
1493 if (devmap->device)
1494 devmap->device->features = devmap->features;
1495 spin_unlock(&dasd_devmap_lock);
1496 return 0;
1497}
1498
1499
1500int
1501dasd_add_sysfs_files(struct ccw_device *cdev)
1502{
1503 return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1504}
1505
1506void
1507dasd_remove_sysfs_files(struct ccw_device *cdev)
1508{
1509 sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1510}
1511
1512
1513int
1514dasd_devmap_init(void)
1515{
1516 int i;
1517
1518
1519 dasd_max_devindex = 0;
1520 for (i = 0; i < 256; i++)
1521 INIT_LIST_HEAD(&dasd_hashlists[i]);
1522 return 0;
1523}
1524
1525void
1526dasd_devmap_exit(void)
1527{
1528 dasd_forget_ranges();
1529}
1530