1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999,2001
9 *
10 * Device mapping and dasd= parameter parsing functions. All devmap
11 * functions may not be called from interrupt context. In particular
12 * dasd_get_device is a no-no from interrupt context.
13 *
14 */
15
16 #define KMSG_COMPONENT "dasd"
17
18 #include <linux/ctype.h>
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/slab.h>
22
23 #include <asm/debug.h>
24 #include <linux/uaccess.h>
25 #include <asm/ipl.h>
26
27 /* This is ugly... */
28 #define PRINTK_HEADER "dasd_devmap:"
29 #define DASD_BUS_ID_SIZE 20
30 #define DASD_MAX_PARAMS 256
31
32 #include "dasd_int.h"
33
34 struct kmem_cache *dasd_page_cache;
35 EXPORT_SYMBOL_GPL(dasd_page_cache);
36
37 /*
38 * dasd_devmap_t is used to store the features and the relation
39 * between device number and device index. To find a dasd_devmap_t
40 * that corresponds to a device number of a device index each
41 * dasd_devmap_t is added to two linked lists, one to search by
42 * the device number and one to search by the device index. As
43 * soon as big minor numbers are available the device index list
44 * can be removed since the device number will then be identical
45 * to the device index.
46 */
47 struct dasd_devmap {
48 struct list_head list;
49 char bus_id[DASD_BUS_ID_SIZE];
50 unsigned int devindex;
51 unsigned short features;
52 struct dasd_device *device;
53 };
54
55 /*
56 * Parameter parsing functions for dasd= parameter. The syntax is:
57 * <devno> : (0x)?[0-9a-fA-F]+
58 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
59 * <feature> : ro
60 * <feature_list> : \(<feature>(:<feature>)*\)
61 * <devno-range> : <devno>(-<devno>)?<feature_list>?
62 * <busid-range> : <busid>(-<busid>)?<feature_list>?
63 * <devices> : <devno-range>|<busid-range>
64 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
65 *
66 * <dasd> : autodetect|probeonly|<devices>(,<devices>)*
67 */
68
69 int dasd_probeonly = 0; /* is true, when probeonly mode is active */
70 int dasd_autodetect = 0; /* is true, when autodetection is active */
71 int dasd_nopav = 0; /* is true, when PAV is disabled */
72 EXPORT_SYMBOL_GPL(dasd_nopav);
73 int dasd_nofcx; /* disable High Performance Ficon */
74 EXPORT_SYMBOL_GPL(dasd_nofcx);
75
76 /*
77 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
78 * it is named 'dasd' to directly be filled by insmod with the comma separated
79 * strings when running as a module.
80 */
81 static char *dasd[DASD_MAX_PARAMS];
82 module_param_array(dasd, charp, NULL, S_IRUGO);
83
84 /*
85 * Single spinlock to protect devmap and servermap structures and lists.
86 */
87 static DEFINE_SPINLOCK(dasd_devmap_lock);
88
89 /*
90 * Hash lists for devmap structures.
91 */
92 static struct list_head dasd_hashlists[256];
93 int dasd_max_devindex;
94
95 static struct dasd_devmap *dasd_add_busid(const char *, int);
96
97 static inline int
dasd_hash_busid(const char * bus_id)98 dasd_hash_busid(const char *bus_id)
99 {
100 int hash, i;
101
102 hash = 0;
103 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
104 hash += *bus_id;
105 return hash & 0xff;
106 }
107
108 #ifndef MODULE
dasd_call_setup(char * opt)109 static int __init dasd_call_setup(char *opt)
110 {
111 static int i __initdata;
112 char *tmp;
113
114 while (i < DASD_MAX_PARAMS) {
115 tmp = strsep(&opt, ",");
116 if (!tmp)
117 break;
118
119 dasd[i++] = tmp;
120 }
121
122 return 1;
123 }
124
125 __setup ("dasd=", dasd_call_setup);
126 #endif /* #ifndef MODULE */
127
128 #define DASD_IPLDEV "ipldev"
129
130 /*
131 * Read a device busid/devno from a string.
132 */
dasd_busid(char * str,int * id0,int * id1,int * devno)133 static int __init dasd_busid(char *str, int *id0, int *id1, int *devno)
134 {
135 unsigned int val;
136 char *tok;
137
138 /* Interpret ipldev busid */
139 if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) {
140 if (ipl_info.type != IPL_TYPE_CCW) {
141 pr_err("The IPL device is not a CCW device\n");
142 return -EINVAL;
143 }
144 *id0 = 0;
145 *id1 = ipl_info.data.ccw.dev_id.ssid;
146 *devno = ipl_info.data.ccw.dev_id.devno;
147
148 return 0;
149 }
150
151 /* Old style 0xXXXX or XXXX */
152 if (!kstrtouint(str, 16, &val)) {
153 *id0 = *id1 = 0;
154 if (val > 0xffff)
155 return -EINVAL;
156 *devno = val;
157 return 0;
158 }
159
160 /* New style x.y.z busid */
161 tok = strsep(&str, ".");
162 if (kstrtouint(tok, 16, &val) || val > 0xff)
163 return -EINVAL;
164 *id0 = val;
165
166 tok = strsep(&str, ".");
167 if (kstrtouint(tok, 16, &val) || val > 0xff)
168 return -EINVAL;
169 *id1 = val;
170
171 tok = strsep(&str, ".");
172 if (kstrtouint(tok, 16, &val) || val > 0xffff)
173 return -EINVAL;
174 *devno = val;
175
176 return 0;
177 }
178
179 /*
180 * Read colon separated list of dasd features.
181 */
dasd_feature_list(char * str)182 static int __init dasd_feature_list(char *str)
183 {
184 int features, len, rc;
185
186 features = 0;
187 rc = 0;
188
189 if (!str)
190 return DASD_FEATURE_DEFAULT;
191
192 while (1) {
193 for (len = 0;
194 str[len] && str[len] != ':' && str[len] != ')'; len++);
195 if (len == 2 && !strncmp(str, "ro", 2))
196 features |= DASD_FEATURE_READONLY;
197 else if (len == 4 && !strncmp(str, "diag", 4))
198 features |= DASD_FEATURE_USEDIAG;
199 else if (len == 3 && !strncmp(str, "raw", 3))
200 features |= DASD_FEATURE_USERAW;
201 else if (len == 6 && !strncmp(str, "erplog", 6))
202 features |= DASD_FEATURE_ERPLOG;
203 else if (len == 8 && !strncmp(str, "failfast", 8))
204 features |= DASD_FEATURE_FAILFAST;
205 else {
206 pr_warn("%.*s is not a supported device option\n",
207 len, str);
208 rc = -EINVAL;
209 }
210 str += len;
211 if (*str != ':')
212 break;
213 str++;
214 }
215
216 return rc ? : features;
217 }
218
219 /*
220 * Try to match the first element on the comma separated parse string
221 * with one of the known keywords. If a keyword is found, take the approprate
222 * action and return a pointer to the residual string. If the first element
223 * could not be matched to any keyword then return an error code.
224 */
dasd_parse_keyword(char * keyword)225 static int __init dasd_parse_keyword(char *keyword)
226 {
227 int length = strlen(keyword);
228
229 if (strncmp("autodetect", keyword, length) == 0) {
230 dasd_autodetect = 1;
231 pr_info("The autodetection mode has been activated\n");
232 return 0;
233 }
234 if (strncmp("probeonly", keyword, length) == 0) {
235 dasd_probeonly = 1;
236 pr_info("The probeonly mode has been activated\n");
237 return 0;
238 }
239 if (strncmp("nopav", keyword, length) == 0) {
240 if (MACHINE_IS_VM)
241 pr_info("'nopav' is not supported on z/VM\n");
242 else {
243 dasd_nopav = 1;
244 pr_info("PAV support has be deactivated\n");
245 }
246 return 0;
247 }
248 if (strncmp("nofcx", keyword, length) == 0) {
249 dasd_nofcx = 1;
250 pr_info("High Performance FICON support has been "
251 "deactivated\n");
252 return 0;
253 }
254 if (strncmp("fixedbuffers", keyword, length) == 0) {
255 if (dasd_page_cache)
256 return 0;
257 dasd_page_cache =
258 kmem_cache_create("dasd_page_cache", PAGE_SIZE,
259 PAGE_SIZE, SLAB_CACHE_DMA,
260 NULL);
261 if (!dasd_page_cache)
262 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
263 "fixed buffer mode disabled.");
264 else
265 DBF_EVENT(DBF_INFO, "%s",
266 "turning on fixed buffer mode");
267 return 0;
268 }
269
270 return -EINVAL;
271 }
272
273 /*
274 * Split a string of a device range into its pieces and return the from, to, and
275 * feature parts separately.
276 * e.g.:
277 * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog
278 * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw
279 * 0x4321 -> from: 0x4321 to: null features: null
280 */
dasd_evaluate_range_param(char * range,char ** from_str,char ** to_str,char ** features_str)281 static int __init dasd_evaluate_range_param(char *range, char **from_str,
282 char **to_str, char **features_str)
283 {
284 int rc = 0;
285
286 /* Do we have a range or a single device? */
287 if (strchr(range, '-')) {
288 *from_str = strsep(&range, "-");
289 *to_str = strsep(&range, "(");
290 *features_str = strsep(&range, ")");
291 } else {
292 *from_str = strsep(&range, "(");
293 *features_str = strsep(&range, ")");
294 }
295
296 if (*features_str && !range) {
297 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
298 rc = -EINVAL;
299 }
300
301 return rc;
302 }
303
304 /*
305 * Try to interprete the range string as a device number or a range of devices.
306 * If the interpretation is successful, create the matching dasd_devmap entries.
307 * If interpretation fails or in case of an error, return an error code.
308 */
dasd_parse_range(const char * range)309 static int __init dasd_parse_range(const char *range)
310 {
311 struct dasd_devmap *devmap;
312 int from, from_id0, from_id1;
313 int to, to_id0, to_id1;
314 int features;
315 char bus_id[DASD_BUS_ID_SIZE + 1];
316 char *features_str = NULL;
317 char *from_str = NULL;
318 char *to_str = NULL;
319 int rc = 0;
320 char *tmp;
321
322 tmp = kstrdup(range, GFP_KERNEL);
323 if (!tmp)
324 return -ENOMEM;
325
326 if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) {
327 rc = -EINVAL;
328 goto out;
329 }
330
331 if (dasd_busid(from_str, &from_id0, &from_id1, &from)) {
332 rc = -EINVAL;
333 goto out;
334 }
335
336 to = from;
337 to_id0 = from_id0;
338 to_id1 = from_id1;
339 if (to_str) {
340 if (dasd_busid(to_str, &to_id0, &to_id1, &to)) {
341 rc = -EINVAL;
342 goto out;
343 }
344 if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) {
345 pr_err("%s is not a valid device range\n", range);
346 rc = -EINVAL;
347 goto out;
348 }
349 }
350
351 features = dasd_feature_list(features_str);
352 if (features < 0) {
353 rc = -EINVAL;
354 goto out;
355 }
356 /* each device in dasd= parameter should be set initially online */
357 features |= DASD_FEATURE_INITIAL_ONLINE;
358 while (from <= to) {
359 sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++);
360 devmap = dasd_add_busid(bus_id, features);
361 if (IS_ERR(devmap)) {
362 rc = PTR_ERR(devmap);
363 goto out;
364 }
365 }
366
367 out:
368 kfree(tmp);
369
370 return rc;
371 }
372
373 /*
374 * Parse parameters stored in dasd[]
375 * The 'dasd=...' parameter allows to specify a comma separated list of
376 * keywords and device ranges. The parameters in that list will be stored as
377 * separate elementes in dasd[].
378 */
dasd_parse(void)379 int __init dasd_parse(void)
380 {
381 int rc, i;
382 char *cur;
383
384 rc = 0;
385 for (i = 0; i < DASD_MAX_PARAMS; i++) {
386 cur = dasd[i];
387 if (!cur)
388 break;
389 if (*cur == '\0')
390 continue;
391
392 rc = dasd_parse_keyword(cur);
393 if (rc)
394 rc = dasd_parse_range(cur);
395
396 if (rc)
397 break;
398 }
399
400 return rc;
401 }
402
403 /*
404 * Add a devmap for the device specified by busid. It is possible that
405 * the devmap already exists (dasd= parameter). The order of the devices
406 * added through this function will define the kdevs for the individual
407 * devices.
408 */
409 static struct dasd_devmap *
dasd_add_busid(const char * bus_id,int features)410 dasd_add_busid(const char *bus_id, int features)
411 {
412 struct dasd_devmap *devmap, *new, *tmp;
413 int hash;
414
415 new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
416 if (!new)
417 return ERR_PTR(-ENOMEM);
418 spin_lock(&dasd_devmap_lock);
419 devmap = NULL;
420 hash = dasd_hash_busid(bus_id);
421 list_for_each_entry(tmp, &dasd_hashlists[hash], list)
422 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
423 devmap = tmp;
424 break;
425 }
426 if (!devmap) {
427 /* This bus_id is new. */
428 new->devindex = dasd_max_devindex++;
429 strlcpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
430 new->features = features;
431 new->device = NULL;
432 list_add(&new->list, &dasd_hashlists[hash]);
433 devmap = new;
434 new = NULL;
435 }
436 spin_unlock(&dasd_devmap_lock);
437 kfree(new);
438 return devmap;
439 }
440
441 /*
442 * Find devmap for device with given bus_id.
443 */
444 static struct dasd_devmap *
dasd_find_busid(const char * bus_id)445 dasd_find_busid(const char *bus_id)
446 {
447 struct dasd_devmap *devmap, *tmp;
448 int hash;
449
450 spin_lock(&dasd_devmap_lock);
451 devmap = ERR_PTR(-ENODEV);
452 hash = dasd_hash_busid(bus_id);
453 list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
454 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
455 devmap = tmp;
456 break;
457 }
458 }
459 spin_unlock(&dasd_devmap_lock);
460 return devmap;
461 }
462
463 /*
464 * Check if busid has been added to the list of dasd ranges.
465 */
466 int
dasd_busid_known(const char * bus_id)467 dasd_busid_known(const char *bus_id)
468 {
469 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
470 }
471
472 /*
473 * Forget all about the device numbers added so far.
474 * This may only be called at module unload or system shutdown.
475 */
476 static void
dasd_forget_ranges(void)477 dasd_forget_ranges(void)
478 {
479 struct dasd_devmap *devmap, *n;
480 int i;
481
482 spin_lock(&dasd_devmap_lock);
483 for (i = 0; i < 256; i++) {
484 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
485 BUG_ON(devmap->device != NULL);
486 list_del(&devmap->list);
487 kfree(devmap);
488 }
489 }
490 spin_unlock(&dasd_devmap_lock);
491 }
492
493 /*
494 * Find the device struct by its device index.
495 */
496 struct dasd_device *
dasd_device_from_devindex(int devindex)497 dasd_device_from_devindex(int devindex)
498 {
499 struct dasd_devmap *devmap, *tmp;
500 struct dasd_device *device;
501 int i;
502
503 spin_lock(&dasd_devmap_lock);
504 devmap = NULL;
505 for (i = 0; (i < 256) && !devmap; i++)
506 list_for_each_entry(tmp, &dasd_hashlists[i], list)
507 if (tmp->devindex == devindex) {
508 /* Found the devmap for the device. */
509 devmap = tmp;
510 break;
511 }
512 if (devmap && devmap->device) {
513 device = devmap->device;
514 dasd_get_device(device);
515 } else
516 device = ERR_PTR(-ENODEV);
517 spin_unlock(&dasd_devmap_lock);
518 return device;
519 }
520
521 /*
522 * Return devmap for cdev. If no devmap exists yet, create one and
523 * connect it to the cdev.
524 */
525 static struct dasd_devmap *
dasd_devmap_from_cdev(struct ccw_device * cdev)526 dasd_devmap_from_cdev(struct ccw_device *cdev)
527 {
528 struct dasd_devmap *devmap;
529
530 devmap = dasd_find_busid(dev_name(&cdev->dev));
531 if (IS_ERR(devmap))
532 devmap = dasd_add_busid(dev_name(&cdev->dev),
533 DASD_FEATURE_DEFAULT);
534 return devmap;
535 }
536
537 /*
538 * Create a dasd device structure for cdev.
539 */
540 struct dasd_device *
dasd_create_device(struct ccw_device * cdev)541 dasd_create_device(struct ccw_device *cdev)
542 {
543 struct dasd_devmap *devmap;
544 struct dasd_device *device;
545 unsigned long flags;
546 int rc;
547
548 devmap = dasd_devmap_from_cdev(cdev);
549 if (IS_ERR(devmap))
550 return (void *) devmap;
551
552 device = dasd_alloc_device();
553 if (IS_ERR(device))
554 return device;
555 atomic_set(&device->ref_count, 3);
556
557 spin_lock(&dasd_devmap_lock);
558 if (!devmap->device) {
559 devmap->device = device;
560 device->devindex = devmap->devindex;
561 device->features = devmap->features;
562 get_device(&cdev->dev);
563 device->cdev = cdev;
564 rc = 0;
565 } else
566 /* Someone else was faster. */
567 rc = -EBUSY;
568 spin_unlock(&dasd_devmap_lock);
569
570 if (rc) {
571 dasd_free_device(device);
572 return ERR_PTR(rc);
573 }
574
575 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
576 dev_set_drvdata(&cdev->dev, device);
577 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
578
579 device->paths_info = kset_create_and_add("paths_info", NULL,
580 &device->cdev->dev.kobj);
581 if (!device->paths_info)
582 dev_warn(&cdev->dev, "Could not create paths_info kset\n");
583
584 return device;
585 }
586
587 /*
588 * Wait queue for dasd_delete_device waits.
589 */
590 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
591
592 /*
593 * Remove a dasd device structure. The passed referenced
594 * is destroyed.
595 */
596 void
dasd_delete_device(struct dasd_device * device)597 dasd_delete_device(struct dasd_device *device)
598 {
599 struct ccw_device *cdev;
600 struct dasd_devmap *devmap;
601 unsigned long flags;
602
603 /* First remove device pointer from devmap. */
604 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
605 BUG_ON(IS_ERR(devmap));
606 spin_lock(&dasd_devmap_lock);
607 if (devmap->device != device) {
608 spin_unlock(&dasd_devmap_lock);
609 dasd_put_device(device);
610 return;
611 }
612 devmap->device = NULL;
613 spin_unlock(&dasd_devmap_lock);
614
615 /* Disconnect dasd_device structure from ccw_device structure. */
616 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
617 dev_set_drvdata(&device->cdev->dev, NULL);
618 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
619
620 /*
621 * Drop ref_count by 3, one for the devmap reference, one for
622 * the cdev reference and one for the passed reference.
623 */
624 atomic_sub(3, &device->ref_count);
625
626 /* Wait for reference counter to drop to zero. */
627 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
628
629 dasd_generic_free_discipline(device);
630
631 kset_unregister(device->paths_info);
632
633 /* Disconnect dasd_device structure from ccw_device structure. */
634 cdev = device->cdev;
635 device->cdev = NULL;
636
637 /* Put ccw_device structure. */
638 put_device(&cdev->dev);
639
640 /* Now the device structure can be freed. */
641 dasd_free_device(device);
642 }
643
644 /*
645 * Reference counter dropped to zero. Wake up waiter
646 * in dasd_delete_device.
647 */
648 void
dasd_put_device_wake(struct dasd_device * device)649 dasd_put_device_wake(struct dasd_device *device)
650 {
651 wake_up(&dasd_delete_wq);
652 }
653 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
654
655 /*
656 * Return dasd_device structure associated with cdev.
657 * This function needs to be called with the ccw device
658 * lock held. It can be used from interrupt context.
659 */
660 struct dasd_device *
dasd_device_from_cdev_locked(struct ccw_device * cdev)661 dasd_device_from_cdev_locked(struct ccw_device *cdev)
662 {
663 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
664
665 if (!device)
666 return ERR_PTR(-ENODEV);
667 dasd_get_device(device);
668 return device;
669 }
670
671 /*
672 * Return dasd_device structure associated with cdev.
673 */
674 struct dasd_device *
dasd_device_from_cdev(struct ccw_device * cdev)675 dasd_device_from_cdev(struct ccw_device *cdev)
676 {
677 struct dasd_device *device;
678 unsigned long flags;
679
680 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
681 device = dasd_device_from_cdev_locked(cdev);
682 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
683 return device;
684 }
685
dasd_add_link_to_gendisk(struct gendisk * gdp,struct dasd_device * device)686 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
687 {
688 struct dasd_devmap *devmap;
689
690 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
691 if (IS_ERR(devmap))
692 return;
693 spin_lock(&dasd_devmap_lock);
694 gdp->private_data = devmap;
695 spin_unlock(&dasd_devmap_lock);
696 }
697
dasd_device_from_gendisk(struct gendisk * gdp)698 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
699 {
700 struct dasd_device *device;
701 struct dasd_devmap *devmap;
702
703 if (!gdp->private_data)
704 return NULL;
705 device = NULL;
706 spin_lock(&dasd_devmap_lock);
707 devmap = gdp->private_data;
708 if (devmap && devmap->device) {
709 device = devmap->device;
710 dasd_get_device(device);
711 }
712 spin_unlock(&dasd_devmap_lock);
713 return device;
714 }
715
716 /*
717 * SECTION: files in sysfs
718 */
719
720 /*
721 * failfast controls the behaviour, if no path is available
722 */
dasd_ff_show(struct device * dev,struct device_attribute * attr,char * buf)723 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
724 char *buf)
725 {
726 struct dasd_devmap *devmap;
727 int ff_flag;
728
729 devmap = dasd_find_busid(dev_name(dev));
730 if (!IS_ERR(devmap))
731 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
732 else
733 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
734 return sysfs_emit(buf, ff_flag ? "1\n" : "0\n");
735 }
736
dasd_ff_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)737 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
738 const char *buf, size_t count)
739 {
740 unsigned int val;
741 int rc;
742
743 if (kstrtouint(buf, 0, &val) || val > 1)
744 return -EINVAL;
745
746 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val);
747
748 return rc ? : count;
749 }
750
751 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
752
753 /*
754 * readonly controls the readonly status of a dasd
755 */
756 static ssize_t
dasd_ro_show(struct device * dev,struct device_attribute * attr,char * buf)757 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
758 {
759 struct dasd_devmap *devmap;
760 struct dasd_device *device;
761 int ro_flag = 0;
762
763 devmap = dasd_find_busid(dev_name(dev));
764 if (IS_ERR(devmap))
765 goto out;
766
767 ro_flag = !!(devmap->features & DASD_FEATURE_READONLY);
768
769 spin_lock(&dasd_devmap_lock);
770 device = devmap->device;
771 if (device)
772 ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
773 spin_unlock(&dasd_devmap_lock);
774
775 out:
776 return sysfs_emit(buf, ro_flag ? "1\n" : "0\n");
777 }
778
779 static ssize_t
dasd_ro_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)780 dasd_ro_store(struct device *dev, struct device_attribute *attr,
781 const char *buf, size_t count)
782 {
783 struct ccw_device *cdev = to_ccwdev(dev);
784 struct dasd_device *device;
785 unsigned long flags;
786 unsigned int val;
787 int rc;
788
789 if (kstrtouint(buf, 0, &val) || val > 1)
790 return -EINVAL;
791
792 rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val);
793 if (rc)
794 return rc;
795
796 device = dasd_device_from_cdev(cdev);
797 if (IS_ERR(device))
798 return count;
799
800 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
801 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
802
803 if (!device->block || !device->block->gdp ||
804 test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
805 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
806 goto out;
807 }
808 /* Increase open_count to avoid losing the block device */
809 atomic_inc(&device->block->open_count);
810 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
811
812 set_disk_ro(device->block->gdp, val);
813 atomic_dec(&device->block->open_count);
814
815 out:
816 dasd_put_device(device);
817
818 return count;
819 }
820
821 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
822 /*
823 * erplog controls the logging of ERP related data
824 * (e.g. failing channel programs).
825 */
826 static ssize_t
dasd_erplog_show(struct device * dev,struct device_attribute * attr,char * buf)827 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
828 {
829 struct dasd_devmap *devmap;
830 int erplog;
831
832 devmap = dasd_find_busid(dev_name(dev));
833 if (!IS_ERR(devmap))
834 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
835 else
836 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
837 return sysfs_emit(buf, erplog ? "1\n" : "0\n");
838 }
839
840 static ssize_t
dasd_erplog_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)841 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
842 const char *buf, size_t count)
843 {
844 unsigned int val;
845 int rc;
846
847 if (kstrtouint(buf, 0, &val) || val > 1)
848 return -EINVAL;
849
850 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val);
851
852 return rc ? : count;
853 }
854
855 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
856
857 /*
858 * use_diag controls whether the driver should use diag rather than ssch
859 * to talk to the device
860 */
861 static ssize_t
dasd_use_diag_show(struct device * dev,struct device_attribute * attr,char * buf)862 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
863 {
864 struct dasd_devmap *devmap;
865 int use_diag;
866
867 devmap = dasd_find_busid(dev_name(dev));
868 if (!IS_ERR(devmap))
869 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
870 else
871 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
872 return sprintf(buf, use_diag ? "1\n" : "0\n");
873 }
874
875 static ssize_t
dasd_use_diag_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)876 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
877 const char *buf, size_t count)
878 {
879 struct dasd_devmap *devmap;
880 unsigned int val;
881 ssize_t rc;
882
883 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
884 if (IS_ERR(devmap))
885 return PTR_ERR(devmap);
886
887 if (kstrtouint(buf, 0, &val) || val > 1)
888 return -EINVAL;
889
890 spin_lock(&dasd_devmap_lock);
891 /* Changing diag discipline flag is only allowed in offline state. */
892 rc = count;
893 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
894 if (val)
895 devmap->features |= DASD_FEATURE_USEDIAG;
896 else
897 devmap->features &= ~DASD_FEATURE_USEDIAG;
898 } else
899 rc = -EPERM;
900 spin_unlock(&dasd_devmap_lock);
901 return rc;
902 }
903
904 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
905
906 /*
907 * use_raw controls whether the driver should give access to raw eckd data or
908 * operate in standard mode
909 */
910 static ssize_t
dasd_use_raw_show(struct device * dev,struct device_attribute * attr,char * buf)911 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
912 {
913 struct dasd_devmap *devmap;
914 int use_raw;
915
916 devmap = dasd_find_busid(dev_name(dev));
917 if (!IS_ERR(devmap))
918 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
919 else
920 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
921 return sprintf(buf, use_raw ? "1\n" : "0\n");
922 }
923
924 static ssize_t
dasd_use_raw_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)925 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
926 const char *buf, size_t count)
927 {
928 struct dasd_devmap *devmap;
929 ssize_t rc;
930 unsigned long val;
931
932 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
933 if (IS_ERR(devmap))
934 return PTR_ERR(devmap);
935
936 if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
937 return -EINVAL;
938
939 spin_lock(&dasd_devmap_lock);
940 /* Changing diag discipline flag is only allowed in offline state. */
941 rc = count;
942 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
943 if (val)
944 devmap->features |= DASD_FEATURE_USERAW;
945 else
946 devmap->features &= ~DASD_FEATURE_USERAW;
947 } else
948 rc = -EPERM;
949 spin_unlock(&dasd_devmap_lock);
950 return rc;
951 }
952
953 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
954 dasd_use_raw_store);
955
956 static ssize_t
dasd_safe_offline_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)957 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
958 const char *buf, size_t count)
959 {
960 struct ccw_device *cdev = to_ccwdev(dev);
961 struct dasd_device *device;
962 unsigned long flags;
963 int rc;
964
965 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
966 device = dasd_device_from_cdev_locked(cdev);
967 if (IS_ERR(device)) {
968 rc = PTR_ERR(device);
969 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
970 goto out;
971 }
972
973 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
974 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
975 /* Already doing offline processing */
976 dasd_put_device(device);
977 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
978 rc = -EBUSY;
979 goto out;
980 }
981
982 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
983 dasd_put_device(device);
984 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
985
986 rc = ccw_device_set_offline(cdev);
987
988 out:
989 return rc ? rc : count;
990 }
991
992 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
993
994 static ssize_t
dasd_access_show(struct device * dev,struct device_attribute * attr,char * buf)995 dasd_access_show(struct device *dev, struct device_attribute *attr,
996 char *buf)
997 {
998 struct ccw_device *cdev = to_ccwdev(dev);
999 struct dasd_device *device;
1000 int count;
1001
1002 device = dasd_device_from_cdev(cdev);
1003 if (IS_ERR(device))
1004 return PTR_ERR(device);
1005
1006 if (!device->discipline)
1007 count = -ENODEV;
1008 else if (!device->discipline->host_access_count)
1009 count = -EOPNOTSUPP;
1010 else
1011 count = device->discipline->host_access_count(device);
1012
1013 dasd_put_device(device);
1014 if (count < 0)
1015 return count;
1016
1017 return sprintf(buf, "%d\n", count);
1018 }
1019
1020 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL);
1021
1022 static ssize_t
dasd_discipline_show(struct device * dev,struct device_attribute * attr,char * buf)1023 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
1024 char *buf)
1025 {
1026 struct dasd_device *device;
1027 ssize_t len;
1028
1029 device = dasd_device_from_cdev(to_ccwdev(dev));
1030 if (IS_ERR(device))
1031 goto out;
1032 else if (!device->discipline) {
1033 dasd_put_device(device);
1034 goto out;
1035 } else {
1036 len = sysfs_emit(buf, "%s\n",
1037 device->discipline->name);
1038 dasd_put_device(device);
1039 return len;
1040 }
1041 out:
1042 len = sysfs_emit(buf, "none\n");
1043 return len;
1044 }
1045
1046 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1047
1048 static ssize_t
dasd_device_status_show(struct device * dev,struct device_attribute * attr,char * buf)1049 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1050 char *buf)
1051 {
1052 struct dasd_device *device;
1053 ssize_t len;
1054
1055 device = dasd_device_from_cdev(to_ccwdev(dev));
1056 if (!IS_ERR(device)) {
1057 switch (device->state) {
1058 case DASD_STATE_NEW:
1059 len = sysfs_emit(buf, "new\n");
1060 break;
1061 case DASD_STATE_KNOWN:
1062 len = sysfs_emit(buf, "detected\n");
1063 break;
1064 case DASD_STATE_BASIC:
1065 len = sysfs_emit(buf, "basic\n");
1066 break;
1067 case DASD_STATE_UNFMT:
1068 len = sysfs_emit(buf, "unformatted\n");
1069 break;
1070 case DASD_STATE_READY:
1071 len = sysfs_emit(buf, "ready\n");
1072 break;
1073 case DASD_STATE_ONLINE:
1074 len = sysfs_emit(buf, "online\n");
1075 break;
1076 default:
1077 len = sysfs_emit(buf, "no stat\n");
1078 break;
1079 }
1080 dasd_put_device(device);
1081 } else
1082 len = sysfs_emit(buf, "unknown\n");
1083 return len;
1084 }
1085
1086 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1087
dasd_alias_show(struct device * dev,struct device_attribute * attr,char * buf)1088 static ssize_t dasd_alias_show(struct device *dev,
1089 struct device_attribute *attr, char *buf)
1090 {
1091 struct dasd_device *device;
1092 struct dasd_uid uid;
1093
1094 device = dasd_device_from_cdev(to_ccwdev(dev));
1095 if (IS_ERR(device))
1096 return sprintf(buf, "0\n");
1097
1098 if (device->discipline && device->discipline->get_uid &&
1099 !device->discipline->get_uid(device, &uid)) {
1100 if (uid.type == UA_BASE_PAV_ALIAS ||
1101 uid.type == UA_HYPER_PAV_ALIAS) {
1102 dasd_put_device(device);
1103 return sprintf(buf, "1\n");
1104 }
1105 }
1106 dasd_put_device(device);
1107
1108 return sprintf(buf, "0\n");
1109 }
1110
1111 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1112
dasd_vendor_show(struct device * dev,struct device_attribute * attr,char * buf)1113 static ssize_t dasd_vendor_show(struct device *dev,
1114 struct device_attribute *attr, char *buf)
1115 {
1116 struct dasd_device *device;
1117 struct dasd_uid uid;
1118 char *vendor;
1119
1120 device = dasd_device_from_cdev(to_ccwdev(dev));
1121 vendor = "";
1122 if (IS_ERR(device))
1123 return sysfs_emit(buf, "%s\n", vendor);
1124
1125 if (device->discipline && device->discipline->get_uid &&
1126 !device->discipline->get_uid(device, &uid))
1127 vendor = uid.vendor;
1128
1129 dasd_put_device(device);
1130
1131 return sysfs_emit(buf, "%s\n", vendor);
1132 }
1133
1134 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1135
1136 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1137 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1138 /* vduit */ 32 + 1)
1139
1140 static ssize_t
dasd_uid_show(struct device * dev,struct device_attribute * attr,char * buf)1141 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1142 {
1143 struct dasd_device *device;
1144 struct dasd_uid uid;
1145 char uid_string[UID_STRLEN];
1146 char ua_string[3];
1147
1148 device = dasd_device_from_cdev(to_ccwdev(dev));
1149 uid_string[0] = 0;
1150 if (IS_ERR(device))
1151 return sysfs_emit(buf, "%s\n", uid_string);
1152
1153 if (device->discipline && device->discipline->get_uid &&
1154 !device->discipline->get_uid(device, &uid)) {
1155 switch (uid.type) {
1156 case UA_BASE_DEVICE:
1157 snprintf(ua_string, sizeof(ua_string), "%02x",
1158 uid.real_unit_addr);
1159 break;
1160 case UA_BASE_PAV_ALIAS:
1161 snprintf(ua_string, sizeof(ua_string), "%02x",
1162 uid.base_unit_addr);
1163 break;
1164 case UA_HYPER_PAV_ALIAS:
1165 snprintf(ua_string, sizeof(ua_string), "xx");
1166 break;
1167 default:
1168 /* should not happen, treat like base device */
1169 snprintf(ua_string, sizeof(ua_string), "%02x",
1170 uid.real_unit_addr);
1171 break;
1172 }
1173
1174 if (strlen(uid.vduit) > 0)
1175 snprintf(uid_string, sizeof(uid_string),
1176 "%s.%s.%04x.%s.%s",
1177 uid.vendor, uid.serial, uid.ssid, ua_string,
1178 uid.vduit);
1179 else
1180 snprintf(uid_string, sizeof(uid_string),
1181 "%s.%s.%04x.%s",
1182 uid.vendor, uid.serial, uid.ssid, ua_string);
1183 }
1184 dasd_put_device(device);
1185
1186 return sysfs_emit(buf, "%s\n", uid_string);
1187 }
1188 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1189
1190 /*
1191 * extended error-reporting
1192 */
1193 static ssize_t
dasd_eer_show(struct device * dev,struct device_attribute * attr,char * buf)1194 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1195 {
1196 struct dasd_devmap *devmap;
1197 int eer_flag;
1198
1199 devmap = dasd_find_busid(dev_name(dev));
1200 if (!IS_ERR(devmap) && devmap->device)
1201 eer_flag = dasd_eer_enabled(devmap->device);
1202 else
1203 eer_flag = 0;
1204 return sysfs_emit(buf, eer_flag ? "1\n" : "0\n");
1205 }
1206
1207 static ssize_t
dasd_eer_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1208 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1209 const char *buf, size_t count)
1210 {
1211 struct dasd_device *device;
1212 unsigned int val;
1213 int rc = 0;
1214
1215 device = dasd_device_from_cdev(to_ccwdev(dev));
1216 if (IS_ERR(device))
1217 return PTR_ERR(device);
1218
1219 if (kstrtouint(buf, 0, &val) || val > 1)
1220 return -EINVAL;
1221
1222 if (val)
1223 rc = dasd_eer_enable(device);
1224 else
1225 dasd_eer_disable(device);
1226
1227 dasd_put_device(device);
1228
1229 return rc ? : count;
1230 }
1231
1232 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1233
1234 /*
1235 * expiration time for default requests
1236 */
1237 static ssize_t
dasd_expires_show(struct device * dev,struct device_attribute * attr,char * buf)1238 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1239 {
1240 struct dasd_device *device;
1241 int len;
1242
1243 device = dasd_device_from_cdev(to_ccwdev(dev));
1244 if (IS_ERR(device))
1245 return -ENODEV;
1246 len = sysfs_emit(buf, "%lu\n", device->default_expires);
1247 dasd_put_device(device);
1248 return len;
1249 }
1250
1251 static ssize_t
dasd_expires_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1252 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1253 const char *buf, size_t count)
1254 {
1255 struct dasd_device *device;
1256 unsigned long val;
1257
1258 device = dasd_device_from_cdev(to_ccwdev(dev));
1259 if (IS_ERR(device))
1260 return -ENODEV;
1261
1262 if ((kstrtoul(buf, 10, &val) != 0) ||
1263 (val > DASD_EXPIRES_MAX) || val == 0) {
1264 dasd_put_device(device);
1265 return -EINVAL;
1266 }
1267
1268 if (val)
1269 device->default_expires = val;
1270
1271 dasd_put_device(device);
1272 return count;
1273 }
1274
1275 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1276
1277 static ssize_t
dasd_retries_show(struct device * dev,struct device_attribute * attr,char * buf)1278 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1279 {
1280 struct dasd_device *device;
1281 int len;
1282
1283 device = dasd_device_from_cdev(to_ccwdev(dev));
1284 if (IS_ERR(device))
1285 return -ENODEV;
1286 len = sysfs_emit(buf, "%lu\n", device->default_retries);
1287 dasd_put_device(device);
1288 return len;
1289 }
1290
1291 static ssize_t
dasd_retries_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1292 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1293 const char *buf, size_t count)
1294 {
1295 struct dasd_device *device;
1296 unsigned long val;
1297
1298 device = dasd_device_from_cdev(to_ccwdev(dev));
1299 if (IS_ERR(device))
1300 return -ENODEV;
1301
1302 if ((kstrtoul(buf, 10, &val) != 0) ||
1303 (val > DASD_RETRIES_MAX)) {
1304 dasd_put_device(device);
1305 return -EINVAL;
1306 }
1307
1308 if (val)
1309 device->default_retries = val;
1310
1311 dasd_put_device(device);
1312 return count;
1313 }
1314
1315 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1316
1317 static ssize_t
dasd_timeout_show(struct device * dev,struct device_attribute * attr,char * buf)1318 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1319 char *buf)
1320 {
1321 struct dasd_device *device;
1322 int len;
1323
1324 device = dasd_device_from_cdev(to_ccwdev(dev));
1325 if (IS_ERR(device))
1326 return -ENODEV;
1327 len = sysfs_emit(buf, "%lu\n", device->blk_timeout);
1328 dasd_put_device(device);
1329 return len;
1330 }
1331
1332 static ssize_t
dasd_timeout_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1333 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1334 const char *buf, size_t count)
1335 {
1336 struct dasd_device *device;
1337 struct request_queue *q;
1338 unsigned long val;
1339
1340 device = dasd_device_from_cdev(to_ccwdev(dev));
1341 if (IS_ERR(device) || !device->block)
1342 return -ENODEV;
1343
1344 if ((kstrtoul(buf, 10, &val) != 0) ||
1345 val > UINT_MAX / HZ) {
1346 dasd_put_device(device);
1347 return -EINVAL;
1348 }
1349 q = device->block->request_queue;
1350 if (!q) {
1351 dasd_put_device(device);
1352 return -ENODEV;
1353 }
1354
1355 device->blk_timeout = val;
1356
1357 blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1358
1359 dasd_put_device(device);
1360 return count;
1361 }
1362
1363 static DEVICE_ATTR(timeout, 0644,
1364 dasd_timeout_show, dasd_timeout_store);
1365
1366
1367 static ssize_t
dasd_path_reset_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1368 dasd_path_reset_store(struct device *dev, struct device_attribute *attr,
1369 const char *buf, size_t count)
1370 {
1371 struct dasd_device *device;
1372 unsigned int val;
1373
1374 device = dasd_device_from_cdev(to_ccwdev(dev));
1375 if (IS_ERR(device))
1376 return -ENODEV;
1377
1378 if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff)
1379 val = 0;
1380
1381 if (device->discipline && device->discipline->reset_path)
1382 device->discipline->reset_path(device, (__u8) val);
1383
1384 dasd_put_device(device);
1385 return count;
1386 }
1387
1388 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store);
1389
dasd_hpf_show(struct device * dev,struct device_attribute * attr,char * buf)1390 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr,
1391 char *buf)
1392 {
1393 struct dasd_device *device;
1394 int hpf;
1395
1396 device = dasd_device_from_cdev(to_ccwdev(dev));
1397 if (IS_ERR(device))
1398 return -ENODEV;
1399 if (!device->discipline || !device->discipline->hpf_enabled) {
1400 dasd_put_device(device);
1401 return sysfs_emit(buf, "%d\n", dasd_nofcx);
1402 }
1403 hpf = device->discipline->hpf_enabled(device);
1404 dasd_put_device(device);
1405 return sysfs_emit(buf, "%d\n", hpf);
1406 }
1407
1408 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL);
1409
dasd_reservation_policy_show(struct device * dev,struct device_attribute * attr,char * buf)1410 static ssize_t dasd_reservation_policy_show(struct device *dev,
1411 struct device_attribute *attr,
1412 char *buf)
1413 {
1414 struct dasd_devmap *devmap;
1415 int rc = 0;
1416
1417 devmap = dasd_find_busid(dev_name(dev));
1418 if (IS_ERR(devmap)) {
1419 rc = sysfs_emit(buf, "ignore\n");
1420 } else {
1421 spin_lock(&dasd_devmap_lock);
1422 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1423 rc = sysfs_emit(buf, "fail\n");
1424 else
1425 rc = sysfs_emit(buf, "ignore\n");
1426 spin_unlock(&dasd_devmap_lock);
1427 }
1428 return rc;
1429 }
1430
dasd_reservation_policy_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1431 static ssize_t dasd_reservation_policy_store(struct device *dev,
1432 struct device_attribute *attr,
1433 const char *buf, size_t count)
1434 {
1435 struct ccw_device *cdev = to_ccwdev(dev);
1436 int rc;
1437
1438 if (sysfs_streq("ignore", buf))
1439 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0);
1440 else if (sysfs_streq("fail", buf))
1441 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1);
1442 else
1443 rc = -EINVAL;
1444
1445 return rc ? : count;
1446 }
1447
1448 static DEVICE_ATTR(reservation_policy, 0644,
1449 dasd_reservation_policy_show, dasd_reservation_policy_store);
1450
dasd_reservation_state_show(struct device * dev,struct device_attribute * attr,char * buf)1451 static ssize_t dasd_reservation_state_show(struct device *dev,
1452 struct device_attribute *attr,
1453 char *buf)
1454 {
1455 struct dasd_device *device;
1456 int rc = 0;
1457
1458 device = dasd_device_from_cdev(to_ccwdev(dev));
1459 if (IS_ERR(device))
1460 return sysfs_emit(buf, "none\n");
1461
1462 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1463 rc = sysfs_emit(buf, "reserved\n");
1464 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1465 rc = sysfs_emit(buf, "lost\n");
1466 else
1467 rc = sysfs_emit(buf, "none\n");
1468 dasd_put_device(device);
1469 return rc;
1470 }
1471
dasd_reservation_state_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1472 static ssize_t dasd_reservation_state_store(struct device *dev,
1473 struct device_attribute *attr,
1474 const char *buf, size_t count)
1475 {
1476 struct dasd_device *device;
1477 int rc = 0;
1478
1479 device = dasd_device_from_cdev(to_ccwdev(dev));
1480 if (IS_ERR(device))
1481 return -ENODEV;
1482 if (sysfs_streq("reset", buf))
1483 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1484 else
1485 rc = -EINVAL;
1486 dasd_put_device(device);
1487
1488 if (rc)
1489 return rc;
1490 else
1491 return count;
1492 }
1493
1494 static DEVICE_ATTR(last_known_reservation_state, 0644,
1495 dasd_reservation_state_show, dasd_reservation_state_store);
1496
dasd_pm_show(struct device * dev,struct device_attribute * attr,char * buf)1497 static ssize_t dasd_pm_show(struct device *dev,
1498 struct device_attribute *attr, char *buf)
1499 {
1500 struct dasd_device *device;
1501 u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm;
1502
1503 device = dasd_device_from_cdev(to_ccwdev(dev));
1504 if (IS_ERR(device))
1505 return sprintf(buf, "0\n");
1506
1507 opm = dasd_path_get_opm(device);
1508 nppm = dasd_path_get_nppm(device);
1509 cablepm = dasd_path_get_cablepm(device);
1510 cuirpm = dasd_path_get_cuirpm(device);
1511 hpfpm = dasd_path_get_hpfpm(device);
1512 ifccpm = dasd_path_get_ifccpm(device);
1513 dasd_put_device(device);
1514
1515 return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm,
1516 cablepm, cuirpm, hpfpm, ifccpm);
1517 }
1518
1519 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1520
1521 /*
1522 * threshold value for IFCC/CCC errors
1523 */
1524 static ssize_t
dasd_path_threshold_show(struct device * dev,struct device_attribute * attr,char * buf)1525 dasd_path_threshold_show(struct device *dev,
1526 struct device_attribute *attr, char *buf)
1527 {
1528 struct dasd_device *device;
1529 int len;
1530
1531 device = dasd_device_from_cdev(to_ccwdev(dev));
1532 if (IS_ERR(device))
1533 return -ENODEV;
1534 len = sysfs_emit(buf, "%lu\n", device->path_thrhld);
1535 dasd_put_device(device);
1536 return len;
1537 }
1538
1539 static ssize_t
dasd_path_threshold_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1540 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr,
1541 const char *buf, size_t count)
1542 {
1543 struct dasd_device *device;
1544 unsigned long flags;
1545 unsigned long val;
1546
1547 device = dasd_device_from_cdev(to_ccwdev(dev));
1548 if (IS_ERR(device))
1549 return -ENODEV;
1550
1551 if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) {
1552 dasd_put_device(device);
1553 return -EINVAL;
1554 }
1555 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1556 device->path_thrhld = val;
1557 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1558 dasd_put_device(device);
1559 return count;
1560 }
1561 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show,
1562 dasd_path_threshold_store);
1563
1564 /*
1565 * configure if path is disabled after IFCC/CCC error threshold is
1566 * exceeded
1567 */
1568 static ssize_t
dasd_path_autodisable_show(struct device * dev,struct device_attribute * attr,char * buf)1569 dasd_path_autodisable_show(struct device *dev,
1570 struct device_attribute *attr, char *buf)
1571 {
1572 struct dasd_devmap *devmap;
1573 int flag;
1574
1575 devmap = dasd_find_busid(dev_name(dev));
1576 if (!IS_ERR(devmap))
1577 flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0;
1578 else
1579 flag = (DASD_FEATURE_DEFAULT &
1580 DASD_FEATURE_PATH_AUTODISABLE) != 0;
1581 return sysfs_emit(buf, flag ? "1\n" : "0\n");
1582 }
1583
1584 static ssize_t
dasd_path_autodisable_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1585 dasd_path_autodisable_store(struct device *dev,
1586 struct device_attribute *attr,
1587 const char *buf, size_t count)
1588 {
1589 unsigned int val;
1590 int rc;
1591
1592 if (kstrtouint(buf, 0, &val) || val > 1)
1593 return -EINVAL;
1594
1595 rc = dasd_set_feature(to_ccwdev(dev),
1596 DASD_FEATURE_PATH_AUTODISABLE, val);
1597
1598 return rc ? : count;
1599 }
1600
1601 static DEVICE_ATTR(path_autodisable, 0644,
1602 dasd_path_autodisable_show,
1603 dasd_path_autodisable_store);
1604 /*
1605 * interval for IFCC/CCC checks
1606 * meaning time with no IFCC/CCC error before the error counter
1607 * gets reset
1608 */
1609 static ssize_t
dasd_path_interval_show(struct device * dev,struct device_attribute * attr,char * buf)1610 dasd_path_interval_show(struct device *dev,
1611 struct device_attribute *attr, char *buf)
1612 {
1613 struct dasd_device *device;
1614 int len;
1615
1616 device = dasd_device_from_cdev(to_ccwdev(dev));
1617 if (IS_ERR(device))
1618 return -ENODEV;
1619 len = sysfs_emit(buf, "%lu\n", device->path_interval);
1620 dasd_put_device(device);
1621 return len;
1622 }
1623
1624 static ssize_t
dasd_path_interval_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1625 dasd_path_interval_store(struct device *dev, struct device_attribute *attr,
1626 const char *buf, size_t count)
1627 {
1628 struct dasd_device *device;
1629 unsigned long flags;
1630 unsigned long val;
1631
1632 device = dasd_device_from_cdev(to_ccwdev(dev));
1633 if (IS_ERR(device))
1634 return -ENODEV;
1635
1636 if ((kstrtoul(buf, 10, &val) != 0) ||
1637 (val > DASD_INTERVAL_MAX) || val == 0) {
1638 dasd_put_device(device);
1639 return -EINVAL;
1640 }
1641 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1642 if (val)
1643 device->path_interval = val;
1644 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1645 dasd_put_device(device);
1646 return count;
1647 }
1648
1649 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show,
1650 dasd_path_interval_store);
1651
1652 static ssize_t
dasd_device_fcs_show(struct device * dev,struct device_attribute * attr,char * buf)1653 dasd_device_fcs_show(struct device *dev, struct device_attribute *attr,
1654 char *buf)
1655 {
1656 struct dasd_device *device;
1657 int fc_sec;
1658 int rc;
1659
1660 device = dasd_device_from_cdev(to_ccwdev(dev));
1661 if (IS_ERR(device))
1662 return -ENODEV;
1663 fc_sec = dasd_path_get_fcs_device(device);
1664 if (fc_sec == -EINVAL)
1665 rc = sysfs_emit(buf, "Inconsistent\n");
1666 else
1667 rc = sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec));
1668 dasd_put_device(device);
1669
1670 return rc;
1671 }
1672 static DEVICE_ATTR(fc_security, 0444, dasd_device_fcs_show, NULL);
1673
1674 static ssize_t
dasd_path_fcs_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)1675 dasd_path_fcs_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
1676 {
1677 struct dasd_path *path = to_dasd_path(kobj);
1678 unsigned int fc_sec = path->fc_security;
1679
1680 return sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec));
1681 }
1682
1683 static struct kobj_attribute path_fcs_attribute =
1684 __ATTR(fc_security, 0444, dasd_path_fcs_show, NULL);
1685
1686 #define DASD_DEFINE_ATTR(_name, _func) \
1687 static ssize_t dasd_##_name##_show(struct device *dev, \
1688 struct device_attribute *attr, \
1689 char *buf) \
1690 { \
1691 struct ccw_device *cdev = to_ccwdev(dev); \
1692 struct dasd_device *device = dasd_device_from_cdev(cdev); \
1693 int val = 0; \
1694 \
1695 if (IS_ERR(device)) \
1696 return -ENODEV; \
1697 if (device->discipline && _func) \
1698 val = _func(device); \
1699 dasd_put_device(device); \
1700 \
1701 return sysfs_emit(buf, "%d\n", val); \
1702 } \
1703 static DEVICE_ATTR(_name, 0444, dasd_##_name##_show, NULL); \
1704
1705 DASD_DEFINE_ATTR(ese, device->discipline->is_ese);
1706 DASD_DEFINE_ATTR(extent_size, device->discipline->ext_size);
1707 DASD_DEFINE_ATTR(pool_id, device->discipline->ext_pool_id);
1708 DASD_DEFINE_ATTR(space_configured, device->discipline->space_configured);
1709 DASD_DEFINE_ATTR(space_allocated, device->discipline->space_allocated);
1710 DASD_DEFINE_ATTR(logical_capacity, device->discipline->logical_capacity);
1711 DASD_DEFINE_ATTR(warn_threshold, device->discipline->ext_pool_warn_thrshld);
1712 DASD_DEFINE_ATTR(cap_at_warnlevel, device->discipline->ext_pool_cap_at_warnlevel);
1713 DASD_DEFINE_ATTR(pool_oos, device->discipline->ext_pool_oos);
1714
1715 static struct attribute * dasd_attrs[] = {
1716 &dev_attr_readonly.attr,
1717 &dev_attr_discipline.attr,
1718 &dev_attr_status.attr,
1719 &dev_attr_alias.attr,
1720 &dev_attr_vendor.attr,
1721 &dev_attr_uid.attr,
1722 &dev_attr_use_diag.attr,
1723 &dev_attr_raw_track_access.attr,
1724 &dev_attr_eer_enabled.attr,
1725 &dev_attr_erplog.attr,
1726 &dev_attr_failfast.attr,
1727 &dev_attr_expires.attr,
1728 &dev_attr_retries.attr,
1729 &dev_attr_timeout.attr,
1730 &dev_attr_reservation_policy.attr,
1731 &dev_attr_last_known_reservation_state.attr,
1732 &dev_attr_safe_offline.attr,
1733 &dev_attr_host_access_count.attr,
1734 &dev_attr_path_masks.attr,
1735 &dev_attr_path_threshold.attr,
1736 &dev_attr_path_autodisable.attr,
1737 &dev_attr_path_interval.attr,
1738 &dev_attr_path_reset.attr,
1739 &dev_attr_hpf.attr,
1740 &dev_attr_ese.attr,
1741 &dev_attr_fc_security.attr,
1742 NULL,
1743 };
1744
1745 static const struct attribute_group dasd_attr_group = {
1746 .attrs = dasd_attrs,
1747 };
1748
1749 static struct attribute *capacity_attrs[] = {
1750 &dev_attr_space_configured.attr,
1751 &dev_attr_space_allocated.attr,
1752 &dev_attr_logical_capacity.attr,
1753 NULL,
1754 };
1755
1756 static const struct attribute_group capacity_attr_group = {
1757 .name = "capacity",
1758 .attrs = capacity_attrs,
1759 };
1760
1761 static struct attribute *ext_pool_attrs[] = {
1762 &dev_attr_pool_id.attr,
1763 &dev_attr_extent_size.attr,
1764 &dev_attr_warn_threshold.attr,
1765 &dev_attr_cap_at_warnlevel.attr,
1766 &dev_attr_pool_oos.attr,
1767 NULL,
1768 };
1769
1770 static const struct attribute_group ext_pool_attr_group = {
1771 .name = "extent_pool",
1772 .attrs = ext_pool_attrs,
1773 };
1774
1775 const struct attribute_group *dasd_dev_groups[] = {
1776 &dasd_attr_group,
1777 &capacity_attr_group,
1778 &ext_pool_attr_group,
1779 NULL,
1780 };
1781 EXPORT_SYMBOL_GPL(dasd_dev_groups);
1782
1783 /*
1784 * Return value of the specified feature.
1785 */
1786 int
dasd_get_feature(struct ccw_device * cdev,int feature)1787 dasd_get_feature(struct ccw_device *cdev, int feature)
1788 {
1789 struct dasd_devmap *devmap;
1790
1791 devmap = dasd_find_busid(dev_name(&cdev->dev));
1792 if (IS_ERR(devmap))
1793 return PTR_ERR(devmap);
1794
1795 return ((devmap->features & feature) != 0);
1796 }
1797
1798 /*
1799 * Set / reset given feature.
1800 * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1801 */
1802 int
dasd_set_feature(struct ccw_device * cdev,int feature,int flag)1803 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1804 {
1805 struct dasd_devmap *devmap;
1806
1807 devmap = dasd_devmap_from_cdev(cdev);
1808 if (IS_ERR(devmap))
1809 return PTR_ERR(devmap);
1810
1811 spin_lock(&dasd_devmap_lock);
1812 if (flag)
1813 devmap->features |= feature;
1814 else
1815 devmap->features &= ~feature;
1816 if (devmap->device)
1817 devmap->device->features = devmap->features;
1818 spin_unlock(&dasd_devmap_lock);
1819 return 0;
1820 }
1821 EXPORT_SYMBOL(dasd_set_feature);
1822
1823 static struct attribute *paths_info_attrs[] = {
1824 &path_fcs_attribute.attr,
1825 NULL,
1826 };
1827 ATTRIBUTE_GROUPS(paths_info);
1828
1829 static struct kobj_type path_attr_type = {
1830 .release = dasd_path_release,
1831 .default_groups = paths_info_groups,
1832 .sysfs_ops = &kobj_sysfs_ops,
1833 };
1834
dasd_path_init_kobj(struct dasd_device * device,int chp)1835 static void dasd_path_init_kobj(struct dasd_device *device, int chp)
1836 {
1837 device->path[chp].kobj.kset = device->paths_info;
1838 kobject_init(&device->path[chp].kobj, &path_attr_type);
1839 }
1840
dasd_path_create_kobj(struct dasd_device * device,int chp)1841 void dasd_path_create_kobj(struct dasd_device *device, int chp)
1842 {
1843 int rc;
1844
1845 if (test_bit(DASD_FLAG_OFFLINE, &device->flags))
1846 return;
1847 if (!device->paths_info) {
1848 dev_warn(&device->cdev->dev, "Unable to create paths objects\n");
1849 return;
1850 }
1851 if (device->path[chp].in_sysfs)
1852 return;
1853 if (!device->path[chp].conf_data)
1854 return;
1855
1856 dasd_path_init_kobj(device, chp);
1857
1858 rc = kobject_add(&device->path[chp].kobj, NULL, "%x.%02x",
1859 device->path[chp].cssid, device->path[chp].chpid);
1860 if (rc)
1861 kobject_put(&device->path[chp].kobj);
1862 device->path[chp].in_sysfs = true;
1863 }
1864 EXPORT_SYMBOL(dasd_path_create_kobj);
1865
dasd_path_create_kobjects(struct dasd_device * device)1866 void dasd_path_create_kobjects(struct dasd_device *device)
1867 {
1868 u8 lpm, opm;
1869
1870 opm = dasd_path_get_opm(device);
1871 for (lpm = 0x80; lpm; lpm >>= 1) {
1872 if (!(lpm & opm))
1873 continue;
1874 dasd_path_create_kobj(device, pathmask_to_pos(lpm));
1875 }
1876 }
1877 EXPORT_SYMBOL(dasd_path_create_kobjects);
1878
dasd_path_remove_kobj(struct dasd_device * device,int chp)1879 static void dasd_path_remove_kobj(struct dasd_device *device, int chp)
1880 {
1881 if (device->path[chp].in_sysfs) {
1882 kobject_put(&device->path[chp].kobj);
1883 device->path[chp].in_sysfs = false;
1884 }
1885 }
1886
1887 /*
1888 * As we keep kobjects for the lifetime of a device, this function must not be
1889 * called anywhere but in the context of offlining a device.
1890 */
dasd_path_remove_kobjects(struct dasd_device * device)1891 void dasd_path_remove_kobjects(struct dasd_device *device)
1892 {
1893 int i;
1894
1895 for (i = 0; i < 8; i++)
1896 dasd_path_remove_kobj(device, i);
1897 }
1898 EXPORT_SYMBOL(dasd_path_remove_kobjects);
1899
1900 int
dasd_devmap_init(void)1901 dasd_devmap_init(void)
1902 {
1903 int i;
1904
1905 /* Initialize devmap structures. */
1906 dasd_max_devindex = 0;
1907 for (i = 0; i < 256; i++)
1908 INIT_LIST_HEAD(&dasd_hashlists[i]);
1909 return 0;
1910 }
1911
1912 void
dasd_devmap_exit(void)1913 dasd_devmap_exit(void)
1914 {
1915 dasd_forget_ranges();
1916 }
1917