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 return device;
580 }
581
582 /*
583 * Wait queue for dasd_delete_device waits.
584 */
585 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
586
587 /*
588 * Remove a dasd device structure. The passed referenced
589 * is destroyed.
590 */
591 void
dasd_delete_device(struct dasd_device * device)592 dasd_delete_device(struct dasd_device *device)
593 {
594 struct ccw_device *cdev;
595 struct dasd_devmap *devmap;
596 unsigned long flags;
597
598 /* First remove device pointer from devmap. */
599 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
600 BUG_ON(IS_ERR(devmap));
601 spin_lock(&dasd_devmap_lock);
602 if (devmap->device != device) {
603 spin_unlock(&dasd_devmap_lock);
604 dasd_put_device(device);
605 return;
606 }
607 devmap->device = NULL;
608 spin_unlock(&dasd_devmap_lock);
609
610 /* Disconnect dasd_device structure from ccw_device structure. */
611 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
612 dev_set_drvdata(&device->cdev->dev, NULL);
613 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
614
615 /*
616 * Drop ref_count by 3, one for the devmap reference, one for
617 * the cdev reference and one for the passed reference.
618 */
619 atomic_sub(3, &device->ref_count);
620
621 /* Wait for reference counter to drop to zero. */
622 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
623
624 dasd_generic_free_discipline(device);
625 /* Disconnect dasd_device structure from ccw_device structure. */
626 cdev = device->cdev;
627 device->cdev = NULL;
628
629 /* Put ccw_device structure. */
630 put_device(&cdev->dev);
631
632 /* Now the device structure can be freed. */
633 dasd_free_device(device);
634 }
635
636 /*
637 * Reference counter dropped to zero. Wake up waiter
638 * in dasd_delete_device.
639 */
640 void
dasd_put_device_wake(struct dasd_device * device)641 dasd_put_device_wake(struct dasd_device *device)
642 {
643 wake_up(&dasd_delete_wq);
644 }
645 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
646
647 /*
648 * Return dasd_device structure associated with cdev.
649 * This function needs to be called with the ccw device
650 * lock held. It can be used from interrupt context.
651 */
652 struct dasd_device *
dasd_device_from_cdev_locked(struct ccw_device * cdev)653 dasd_device_from_cdev_locked(struct ccw_device *cdev)
654 {
655 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
656
657 if (!device)
658 return ERR_PTR(-ENODEV);
659 dasd_get_device(device);
660 return device;
661 }
662
663 /*
664 * Return dasd_device structure associated with cdev.
665 */
666 struct dasd_device *
dasd_device_from_cdev(struct ccw_device * cdev)667 dasd_device_from_cdev(struct ccw_device *cdev)
668 {
669 struct dasd_device *device;
670 unsigned long flags;
671
672 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
673 device = dasd_device_from_cdev_locked(cdev);
674 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
675 return device;
676 }
677
dasd_add_link_to_gendisk(struct gendisk * gdp,struct dasd_device * device)678 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
679 {
680 struct dasd_devmap *devmap;
681
682 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
683 if (IS_ERR(devmap))
684 return;
685 spin_lock(&dasd_devmap_lock);
686 gdp->private_data = devmap;
687 spin_unlock(&dasd_devmap_lock);
688 }
689
dasd_device_from_gendisk(struct gendisk * gdp)690 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
691 {
692 struct dasd_device *device;
693 struct dasd_devmap *devmap;
694
695 if (!gdp->private_data)
696 return NULL;
697 device = NULL;
698 spin_lock(&dasd_devmap_lock);
699 devmap = gdp->private_data;
700 if (devmap && devmap->device) {
701 device = devmap->device;
702 dasd_get_device(device);
703 }
704 spin_unlock(&dasd_devmap_lock);
705 return device;
706 }
707
708 /*
709 * SECTION: files in sysfs
710 */
711
712 /*
713 * failfast controls the behaviour, if no path is available
714 */
dasd_ff_show(struct device * dev,struct device_attribute * attr,char * buf)715 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
716 char *buf)
717 {
718 struct dasd_devmap *devmap;
719 int ff_flag;
720
721 devmap = dasd_find_busid(dev_name(dev));
722 if (!IS_ERR(devmap))
723 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
724 else
725 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
726 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
727 }
728
dasd_ff_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)729 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
730 const char *buf, size_t count)
731 {
732 unsigned int val;
733 int rc;
734
735 if (kstrtouint(buf, 0, &val) || val > 1)
736 return -EINVAL;
737
738 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val);
739
740 return rc ? : count;
741 }
742
743 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
744
745 /*
746 * readonly controls the readonly status of a dasd
747 */
748 static ssize_t
dasd_ro_show(struct device * dev,struct device_attribute * attr,char * buf)749 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
750 {
751 struct dasd_devmap *devmap;
752 struct dasd_device *device;
753 int ro_flag = 0;
754
755 devmap = dasd_find_busid(dev_name(dev));
756 if (IS_ERR(devmap))
757 goto out;
758
759 ro_flag = !!(devmap->features & DASD_FEATURE_READONLY);
760
761 spin_lock(&dasd_devmap_lock);
762 device = devmap->device;
763 if (device)
764 ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
765 spin_unlock(&dasd_devmap_lock);
766
767 out:
768 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
769 }
770
771 static ssize_t
dasd_ro_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)772 dasd_ro_store(struct device *dev, struct device_attribute *attr,
773 const char *buf, size_t count)
774 {
775 struct ccw_device *cdev = to_ccwdev(dev);
776 struct dasd_device *device;
777 unsigned long flags;
778 unsigned int val;
779 int rc;
780
781 if (kstrtouint(buf, 0, &val) || val > 1)
782 return -EINVAL;
783
784 rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val);
785 if (rc)
786 return rc;
787
788 device = dasd_device_from_cdev(cdev);
789 if (IS_ERR(device))
790 return count;
791
792 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
793 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
794
795 if (!device->block || !device->block->gdp ||
796 test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
797 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
798 goto out;
799 }
800 /* Increase open_count to avoid losing the block device */
801 atomic_inc(&device->block->open_count);
802 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
803
804 set_disk_ro(device->block->gdp, val);
805 atomic_dec(&device->block->open_count);
806
807 out:
808 dasd_put_device(device);
809
810 return count;
811 }
812
813 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
814 /*
815 * erplog controls the logging of ERP related data
816 * (e.g. failing channel programs).
817 */
818 static ssize_t
dasd_erplog_show(struct device * dev,struct device_attribute * attr,char * buf)819 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
820 {
821 struct dasd_devmap *devmap;
822 int erplog;
823
824 devmap = dasd_find_busid(dev_name(dev));
825 if (!IS_ERR(devmap))
826 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
827 else
828 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
829 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
830 }
831
832 static ssize_t
dasd_erplog_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)833 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
834 const char *buf, size_t count)
835 {
836 unsigned int val;
837 int rc;
838
839 if (kstrtouint(buf, 0, &val) || val > 1)
840 return -EINVAL;
841
842 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val);
843
844 return rc ? : count;
845 }
846
847 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
848
849 /*
850 * use_diag controls whether the driver should use diag rather than ssch
851 * to talk to the device
852 */
853 static ssize_t
dasd_use_diag_show(struct device * dev,struct device_attribute * attr,char * buf)854 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
855 {
856 struct dasd_devmap *devmap;
857 int use_diag;
858
859 devmap = dasd_find_busid(dev_name(dev));
860 if (!IS_ERR(devmap))
861 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
862 else
863 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
864 return sprintf(buf, use_diag ? "1\n" : "0\n");
865 }
866
867 static ssize_t
dasd_use_diag_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)868 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
869 const char *buf, size_t count)
870 {
871 struct dasd_devmap *devmap;
872 unsigned int val;
873 ssize_t rc;
874
875 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
876 if (IS_ERR(devmap))
877 return PTR_ERR(devmap);
878
879 if (kstrtouint(buf, 0, &val) || val > 1)
880 return -EINVAL;
881
882 spin_lock(&dasd_devmap_lock);
883 /* Changing diag discipline flag is only allowed in offline state. */
884 rc = count;
885 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
886 if (val)
887 devmap->features |= DASD_FEATURE_USEDIAG;
888 else
889 devmap->features &= ~DASD_FEATURE_USEDIAG;
890 } else
891 rc = -EPERM;
892 spin_unlock(&dasd_devmap_lock);
893 return rc;
894 }
895
896 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
897
898 /*
899 * use_raw controls whether the driver should give access to raw eckd data or
900 * operate in standard mode
901 */
902 static ssize_t
dasd_use_raw_show(struct device * dev,struct device_attribute * attr,char * buf)903 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
904 {
905 struct dasd_devmap *devmap;
906 int use_raw;
907
908 devmap = dasd_find_busid(dev_name(dev));
909 if (!IS_ERR(devmap))
910 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
911 else
912 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
913 return sprintf(buf, use_raw ? "1\n" : "0\n");
914 }
915
916 static ssize_t
dasd_use_raw_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)917 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
918 const char *buf, size_t count)
919 {
920 struct dasd_devmap *devmap;
921 ssize_t rc;
922 unsigned long val;
923
924 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
925 if (IS_ERR(devmap))
926 return PTR_ERR(devmap);
927
928 if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
929 return -EINVAL;
930
931 spin_lock(&dasd_devmap_lock);
932 /* Changing diag discipline flag is only allowed in offline state. */
933 rc = count;
934 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
935 if (val)
936 devmap->features |= DASD_FEATURE_USERAW;
937 else
938 devmap->features &= ~DASD_FEATURE_USERAW;
939 } else
940 rc = -EPERM;
941 spin_unlock(&dasd_devmap_lock);
942 return rc;
943 }
944
945 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
946 dasd_use_raw_store);
947
948 static ssize_t
dasd_safe_offline_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)949 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
950 const char *buf, size_t count)
951 {
952 struct ccw_device *cdev = to_ccwdev(dev);
953 struct dasd_device *device;
954 unsigned long flags;
955 int rc;
956
957 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
958 device = dasd_device_from_cdev_locked(cdev);
959 if (IS_ERR(device)) {
960 rc = PTR_ERR(device);
961 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
962 goto out;
963 }
964
965 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
966 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
967 /* Already doing offline processing */
968 dasd_put_device(device);
969 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
970 rc = -EBUSY;
971 goto out;
972 }
973
974 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
975 dasd_put_device(device);
976 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
977
978 rc = ccw_device_set_offline(cdev);
979
980 out:
981 return rc ? rc : count;
982 }
983
984 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
985
986 static ssize_t
dasd_access_show(struct device * dev,struct device_attribute * attr,char * buf)987 dasd_access_show(struct device *dev, struct device_attribute *attr,
988 char *buf)
989 {
990 struct ccw_device *cdev = to_ccwdev(dev);
991 struct dasd_device *device;
992 int count;
993
994 device = dasd_device_from_cdev(cdev);
995 if (IS_ERR(device))
996 return PTR_ERR(device);
997
998 if (!device->discipline)
999 count = -ENODEV;
1000 else if (!device->discipline->host_access_count)
1001 count = -EOPNOTSUPP;
1002 else
1003 count = device->discipline->host_access_count(device);
1004
1005 dasd_put_device(device);
1006 if (count < 0)
1007 return count;
1008
1009 return sprintf(buf, "%d\n", count);
1010 }
1011
1012 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL);
1013
1014 static ssize_t
dasd_discipline_show(struct device * dev,struct device_attribute * attr,char * buf)1015 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
1016 char *buf)
1017 {
1018 struct dasd_device *device;
1019 ssize_t len;
1020
1021 device = dasd_device_from_cdev(to_ccwdev(dev));
1022 if (IS_ERR(device))
1023 goto out;
1024 else if (!device->discipline) {
1025 dasd_put_device(device);
1026 goto out;
1027 } else {
1028 len = snprintf(buf, PAGE_SIZE, "%s\n",
1029 device->discipline->name);
1030 dasd_put_device(device);
1031 return len;
1032 }
1033 out:
1034 len = snprintf(buf, PAGE_SIZE, "none\n");
1035 return len;
1036 }
1037
1038 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1039
1040 static ssize_t
dasd_device_status_show(struct device * dev,struct device_attribute * attr,char * buf)1041 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1042 char *buf)
1043 {
1044 struct dasd_device *device;
1045 ssize_t len;
1046
1047 device = dasd_device_from_cdev(to_ccwdev(dev));
1048 if (!IS_ERR(device)) {
1049 switch (device->state) {
1050 case DASD_STATE_NEW:
1051 len = snprintf(buf, PAGE_SIZE, "new\n");
1052 break;
1053 case DASD_STATE_KNOWN:
1054 len = snprintf(buf, PAGE_SIZE, "detected\n");
1055 break;
1056 case DASD_STATE_BASIC:
1057 len = snprintf(buf, PAGE_SIZE, "basic\n");
1058 break;
1059 case DASD_STATE_UNFMT:
1060 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1061 break;
1062 case DASD_STATE_READY:
1063 len = snprintf(buf, PAGE_SIZE, "ready\n");
1064 break;
1065 case DASD_STATE_ONLINE:
1066 len = snprintf(buf, PAGE_SIZE, "online\n");
1067 break;
1068 default:
1069 len = snprintf(buf, PAGE_SIZE, "no stat\n");
1070 break;
1071 }
1072 dasd_put_device(device);
1073 } else
1074 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1075 return len;
1076 }
1077
1078 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1079
dasd_alias_show(struct device * dev,struct device_attribute * attr,char * buf)1080 static ssize_t dasd_alias_show(struct device *dev,
1081 struct device_attribute *attr, char *buf)
1082 {
1083 struct dasd_device *device;
1084 struct dasd_uid uid;
1085
1086 device = dasd_device_from_cdev(to_ccwdev(dev));
1087 if (IS_ERR(device))
1088 return sprintf(buf, "0\n");
1089
1090 if (device->discipline && device->discipline->get_uid &&
1091 !device->discipline->get_uid(device, &uid)) {
1092 if (uid.type == UA_BASE_PAV_ALIAS ||
1093 uid.type == UA_HYPER_PAV_ALIAS) {
1094 dasd_put_device(device);
1095 return sprintf(buf, "1\n");
1096 }
1097 }
1098 dasd_put_device(device);
1099
1100 return sprintf(buf, "0\n");
1101 }
1102
1103 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1104
dasd_vendor_show(struct device * dev,struct device_attribute * attr,char * buf)1105 static ssize_t dasd_vendor_show(struct device *dev,
1106 struct device_attribute *attr, char *buf)
1107 {
1108 struct dasd_device *device;
1109 struct dasd_uid uid;
1110 char *vendor;
1111
1112 device = dasd_device_from_cdev(to_ccwdev(dev));
1113 vendor = "";
1114 if (IS_ERR(device))
1115 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1116
1117 if (device->discipline && device->discipline->get_uid &&
1118 !device->discipline->get_uid(device, &uid))
1119 vendor = uid.vendor;
1120
1121 dasd_put_device(device);
1122
1123 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1124 }
1125
1126 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1127
1128 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1129 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1130 /* vduit */ 32 + 1)
1131
1132 static ssize_t
dasd_uid_show(struct device * dev,struct device_attribute * attr,char * buf)1133 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1134 {
1135 struct dasd_device *device;
1136 struct dasd_uid uid;
1137 char uid_string[UID_STRLEN];
1138 char ua_string[3];
1139
1140 device = dasd_device_from_cdev(to_ccwdev(dev));
1141 uid_string[0] = 0;
1142 if (IS_ERR(device))
1143 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1144
1145 if (device->discipline && device->discipline->get_uid &&
1146 !device->discipline->get_uid(device, &uid)) {
1147 switch (uid.type) {
1148 case UA_BASE_DEVICE:
1149 snprintf(ua_string, sizeof(ua_string), "%02x",
1150 uid.real_unit_addr);
1151 break;
1152 case UA_BASE_PAV_ALIAS:
1153 snprintf(ua_string, sizeof(ua_string), "%02x",
1154 uid.base_unit_addr);
1155 break;
1156 case UA_HYPER_PAV_ALIAS:
1157 snprintf(ua_string, sizeof(ua_string), "xx");
1158 break;
1159 default:
1160 /* should not happen, treat like base device */
1161 snprintf(ua_string, sizeof(ua_string), "%02x",
1162 uid.real_unit_addr);
1163 break;
1164 }
1165
1166 if (strlen(uid.vduit) > 0)
1167 snprintf(uid_string, sizeof(uid_string),
1168 "%s.%s.%04x.%s.%s",
1169 uid.vendor, uid.serial, uid.ssid, ua_string,
1170 uid.vduit);
1171 else
1172 snprintf(uid_string, sizeof(uid_string),
1173 "%s.%s.%04x.%s",
1174 uid.vendor, uid.serial, uid.ssid, ua_string);
1175 }
1176 dasd_put_device(device);
1177
1178 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1179 }
1180 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1181
1182 /*
1183 * extended error-reporting
1184 */
1185 static ssize_t
dasd_eer_show(struct device * dev,struct device_attribute * attr,char * buf)1186 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1187 {
1188 struct dasd_devmap *devmap;
1189 int eer_flag;
1190
1191 devmap = dasd_find_busid(dev_name(dev));
1192 if (!IS_ERR(devmap) && devmap->device)
1193 eer_flag = dasd_eer_enabled(devmap->device);
1194 else
1195 eer_flag = 0;
1196 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1197 }
1198
1199 static ssize_t
dasd_eer_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1200 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1201 const char *buf, size_t count)
1202 {
1203 struct dasd_device *device;
1204 unsigned int val;
1205 int rc = 0;
1206
1207 device = dasd_device_from_cdev(to_ccwdev(dev));
1208 if (IS_ERR(device))
1209 return PTR_ERR(device);
1210
1211 if (kstrtouint(buf, 0, &val) || val > 1)
1212 return -EINVAL;
1213
1214 if (val)
1215 rc = dasd_eer_enable(device);
1216 else
1217 dasd_eer_disable(device);
1218
1219 dasd_put_device(device);
1220
1221 return rc ? : count;
1222 }
1223
1224 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1225
1226 /*
1227 * expiration time for default requests
1228 */
1229 static ssize_t
dasd_expires_show(struct device * dev,struct device_attribute * attr,char * buf)1230 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1231 {
1232 struct dasd_device *device;
1233 int len;
1234
1235 device = dasd_device_from_cdev(to_ccwdev(dev));
1236 if (IS_ERR(device))
1237 return -ENODEV;
1238 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1239 dasd_put_device(device);
1240 return len;
1241 }
1242
1243 static ssize_t
dasd_expires_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1244 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1245 const char *buf, size_t count)
1246 {
1247 struct dasd_device *device;
1248 unsigned long val;
1249
1250 device = dasd_device_from_cdev(to_ccwdev(dev));
1251 if (IS_ERR(device))
1252 return -ENODEV;
1253
1254 if ((kstrtoul(buf, 10, &val) != 0) ||
1255 (val > DASD_EXPIRES_MAX) || val == 0) {
1256 dasd_put_device(device);
1257 return -EINVAL;
1258 }
1259
1260 if (val)
1261 device->default_expires = val;
1262
1263 dasd_put_device(device);
1264 return count;
1265 }
1266
1267 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1268
1269 static ssize_t
dasd_retries_show(struct device * dev,struct device_attribute * attr,char * buf)1270 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1271 {
1272 struct dasd_device *device;
1273 int len;
1274
1275 device = dasd_device_from_cdev(to_ccwdev(dev));
1276 if (IS_ERR(device))
1277 return -ENODEV;
1278 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1279 dasd_put_device(device);
1280 return len;
1281 }
1282
1283 static ssize_t
dasd_retries_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1284 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1285 const char *buf, size_t count)
1286 {
1287 struct dasd_device *device;
1288 unsigned long val;
1289
1290 device = dasd_device_from_cdev(to_ccwdev(dev));
1291 if (IS_ERR(device))
1292 return -ENODEV;
1293
1294 if ((kstrtoul(buf, 10, &val) != 0) ||
1295 (val > DASD_RETRIES_MAX)) {
1296 dasd_put_device(device);
1297 return -EINVAL;
1298 }
1299
1300 if (val)
1301 device->default_retries = val;
1302
1303 dasd_put_device(device);
1304 return count;
1305 }
1306
1307 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1308
1309 static ssize_t
dasd_timeout_show(struct device * dev,struct device_attribute * attr,char * buf)1310 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1311 char *buf)
1312 {
1313 struct dasd_device *device;
1314 int len;
1315
1316 device = dasd_device_from_cdev(to_ccwdev(dev));
1317 if (IS_ERR(device))
1318 return -ENODEV;
1319 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1320 dasd_put_device(device);
1321 return len;
1322 }
1323
1324 static ssize_t
dasd_timeout_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1325 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1326 const char *buf, size_t count)
1327 {
1328 struct dasd_device *device;
1329 struct request_queue *q;
1330 unsigned long val;
1331
1332 device = dasd_device_from_cdev(to_ccwdev(dev));
1333 if (IS_ERR(device) || !device->block)
1334 return -ENODEV;
1335
1336 if ((kstrtoul(buf, 10, &val) != 0) ||
1337 val > UINT_MAX / HZ) {
1338 dasd_put_device(device);
1339 return -EINVAL;
1340 }
1341 q = device->block->request_queue;
1342 if (!q) {
1343 dasd_put_device(device);
1344 return -ENODEV;
1345 }
1346
1347 device->blk_timeout = val;
1348
1349 blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1350
1351 dasd_put_device(device);
1352 return count;
1353 }
1354
1355 static DEVICE_ATTR(timeout, 0644,
1356 dasd_timeout_show, dasd_timeout_store);
1357
1358
1359 static ssize_t
dasd_path_reset_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1360 dasd_path_reset_store(struct device *dev, struct device_attribute *attr,
1361 const char *buf, size_t count)
1362 {
1363 struct dasd_device *device;
1364 unsigned int val;
1365
1366 device = dasd_device_from_cdev(to_ccwdev(dev));
1367 if (IS_ERR(device))
1368 return -ENODEV;
1369
1370 if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff)
1371 val = 0;
1372
1373 if (device->discipline && device->discipline->reset_path)
1374 device->discipline->reset_path(device, (__u8) val);
1375
1376 dasd_put_device(device);
1377 return count;
1378 }
1379
1380 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store);
1381
dasd_hpf_show(struct device * dev,struct device_attribute * attr,char * buf)1382 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr,
1383 char *buf)
1384 {
1385 struct dasd_device *device;
1386 int hpf;
1387
1388 device = dasd_device_from_cdev(to_ccwdev(dev));
1389 if (IS_ERR(device))
1390 return -ENODEV;
1391 if (!device->discipline || !device->discipline->hpf_enabled) {
1392 dasd_put_device(device);
1393 return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx);
1394 }
1395 hpf = device->discipline->hpf_enabled(device);
1396 dasd_put_device(device);
1397 return snprintf(buf, PAGE_SIZE, "%d\n", hpf);
1398 }
1399
1400 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL);
1401
dasd_reservation_policy_show(struct device * dev,struct device_attribute * attr,char * buf)1402 static ssize_t dasd_reservation_policy_show(struct device *dev,
1403 struct device_attribute *attr,
1404 char *buf)
1405 {
1406 struct dasd_devmap *devmap;
1407 int rc = 0;
1408
1409 devmap = dasd_find_busid(dev_name(dev));
1410 if (IS_ERR(devmap)) {
1411 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1412 } else {
1413 spin_lock(&dasd_devmap_lock);
1414 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1415 rc = snprintf(buf, PAGE_SIZE, "fail\n");
1416 else
1417 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1418 spin_unlock(&dasd_devmap_lock);
1419 }
1420 return rc;
1421 }
1422
dasd_reservation_policy_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1423 static ssize_t dasd_reservation_policy_store(struct device *dev,
1424 struct device_attribute *attr,
1425 const char *buf, size_t count)
1426 {
1427 struct ccw_device *cdev = to_ccwdev(dev);
1428 int rc;
1429
1430 if (sysfs_streq("ignore", buf))
1431 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0);
1432 else if (sysfs_streq("fail", buf))
1433 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1);
1434 else
1435 rc = -EINVAL;
1436
1437 return rc ? : count;
1438 }
1439
1440 static DEVICE_ATTR(reservation_policy, 0644,
1441 dasd_reservation_policy_show, dasd_reservation_policy_store);
1442
dasd_reservation_state_show(struct device * dev,struct device_attribute * attr,char * buf)1443 static ssize_t dasd_reservation_state_show(struct device *dev,
1444 struct device_attribute *attr,
1445 char *buf)
1446 {
1447 struct dasd_device *device;
1448 int rc = 0;
1449
1450 device = dasd_device_from_cdev(to_ccwdev(dev));
1451 if (IS_ERR(device))
1452 return snprintf(buf, PAGE_SIZE, "none\n");
1453
1454 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1455 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1456 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1457 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1458 else
1459 rc = snprintf(buf, PAGE_SIZE, "none\n");
1460 dasd_put_device(device);
1461 return rc;
1462 }
1463
dasd_reservation_state_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1464 static ssize_t dasd_reservation_state_store(struct device *dev,
1465 struct device_attribute *attr,
1466 const char *buf, size_t count)
1467 {
1468 struct dasd_device *device;
1469 int rc = 0;
1470
1471 device = dasd_device_from_cdev(to_ccwdev(dev));
1472 if (IS_ERR(device))
1473 return -ENODEV;
1474 if (sysfs_streq("reset", buf))
1475 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1476 else
1477 rc = -EINVAL;
1478 dasd_put_device(device);
1479
1480 if (rc)
1481 return rc;
1482 else
1483 return count;
1484 }
1485
1486 static DEVICE_ATTR(last_known_reservation_state, 0644,
1487 dasd_reservation_state_show, dasd_reservation_state_store);
1488
dasd_pm_show(struct device * dev,struct device_attribute * attr,char * buf)1489 static ssize_t dasd_pm_show(struct device *dev,
1490 struct device_attribute *attr, char *buf)
1491 {
1492 struct dasd_device *device;
1493 u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm;
1494
1495 device = dasd_device_from_cdev(to_ccwdev(dev));
1496 if (IS_ERR(device))
1497 return sprintf(buf, "0\n");
1498
1499 opm = dasd_path_get_opm(device);
1500 nppm = dasd_path_get_nppm(device);
1501 cablepm = dasd_path_get_cablepm(device);
1502 cuirpm = dasd_path_get_cuirpm(device);
1503 hpfpm = dasd_path_get_hpfpm(device);
1504 ifccpm = dasd_path_get_ifccpm(device);
1505 dasd_put_device(device);
1506
1507 return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm,
1508 cablepm, cuirpm, hpfpm, ifccpm);
1509 }
1510
1511 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1512
1513 /*
1514 * threshold value for IFCC/CCC errors
1515 */
1516 static ssize_t
dasd_path_threshold_show(struct device * dev,struct device_attribute * attr,char * buf)1517 dasd_path_threshold_show(struct device *dev,
1518 struct device_attribute *attr, char *buf)
1519 {
1520 struct dasd_device *device;
1521 int len;
1522
1523 device = dasd_device_from_cdev(to_ccwdev(dev));
1524 if (IS_ERR(device))
1525 return -ENODEV;
1526 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld);
1527 dasd_put_device(device);
1528 return len;
1529 }
1530
1531 static ssize_t
dasd_path_threshold_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1532 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr,
1533 const char *buf, size_t count)
1534 {
1535 struct dasd_device *device;
1536 unsigned long flags;
1537 unsigned long val;
1538
1539 device = dasd_device_from_cdev(to_ccwdev(dev));
1540 if (IS_ERR(device))
1541 return -ENODEV;
1542
1543 if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) {
1544 dasd_put_device(device);
1545 return -EINVAL;
1546 }
1547 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1548 device->path_thrhld = val;
1549 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1550 dasd_put_device(device);
1551 return count;
1552 }
1553 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show,
1554 dasd_path_threshold_store);
1555
1556 /*
1557 * configure if path is disabled after IFCC/CCC error threshold is
1558 * exceeded
1559 */
1560 static ssize_t
dasd_path_autodisable_show(struct device * dev,struct device_attribute * attr,char * buf)1561 dasd_path_autodisable_show(struct device *dev,
1562 struct device_attribute *attr, char *buf)
1563 {
1564 struct dasd_devmap *devmap;
1565 int flag;
1566
1567 devmap = dasd_find_busid(dev_name(dev));
1568 if (!IS_ERR(devmap))
1569 flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0;
1570 else
1571 flag = (DASD_FEATURE_DEFAULT &
1572 DASD_FEATURE_PATH_AUTODISABLE) != 0;
1573 return snprintf(buf, PAGE_SIZE, flag ? "1\n" : "0\n");
1574 }
1575
1576 static ssize_t
dasd_path_autodisable_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1577 dasd_path_autodisable_store(struct device *dev,
1578 struct device_attribute *attr,
1579 const char *buf, size_t count)
1580 {
1581 unsigned int val;
1582 int rc;
1583
1584 if (kstrtouint(buf, 0, &val) || val > 1)
1585 return -EINVAL;
1586
1587 rc = dasd_set_feature(to_ccwdev(dev),
1588 DASD_FEATURE_PATH_AUTODISABLE, val);
1589
1590 return rc ? : count;
1591 }
1592
1593 static DEVICE_ATTR(path_autodisable, 0644,
1594 dasd_path_autodisable_show,
1595 dasd_path_autodisable_store);
1596 /*
1597 * interval for IFCC/CCC checks
1598 * meaning time with no IFCC/CCC error before the error counter
1599 * gets reset
1600 */
1601 static ssize_t
dasd_path_interval_show(struct device * dev,struct device_attribute * attr,char * buf)1602 dasd_path_interval_show(struct device *dev,
1603 struct device_attribute *attr, char *buf)
1604 {
1605 struct dasd_device *device;
1606 int len;
1607
1608 device = dasd_device_from_cdev(to_ccwdev(dev));
1609 if (IS_ERR(device))
1610 return -ENODEV;
1611 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval);
1612 dasd_put_device(device);
1613 return len;
1614 }
1615
1616 static ssize_t
dasd_path_interval_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1617 dasd_path_interval_store(struct device *dev, struct device_attribute *attr,
1618 const char *buf, size_t count)
1619 {
1620 struct dasd_device *device;
1621 unsigned long flags;
1622 unsigned long val;
1623
1624 device = dasd_device_from_cdev(to_ccwdev(dev));
1625 if (IS_ERR(device))
1626 return -ENODEV;
1627
1628 if ((kstrtoul(buf, 10, &val) != 0) ||
1629 (val > DASD_INTERVAL_MAX) || val == 0) {
1630 dasd_put_device(device);
1631 return -EINVAL;
1632 }
1633 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1634 if (val)
1635 device->path_interval = val;
1636 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1637 dasd_put_device(device);
1638 return count;
1639 }
1640
1641 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show,
1642 dasd_path_interval_store);
1643
1644
1645 static struct attribute * dasd_attrs[] = {
1646 &dev_attr_readonly.attr,
1647 &dev_attr_discipline.attr,
1648 &dev_attr_status.attr,
1649 &dev_attr_alias.attr,
1650 &dev_attr_vendor.attr,
1651 &dev_attr_uid.attr,
1652 &dev_attr_use_diag.attr,
1653 &dev_attr_raw_track_access.attr,
1654 &dev_attr_eer_enabled.attr,
1655 &dev_attr_erplog.attr,
1656 &dev_attr_failfast.attr,
1657 &dev_attr_expires.attr,
1658 &dev_attr_retries.attr,
1659 &dev_attr_timeout.attr,
1660 &dev_attr_reservation_policy.attr,
1661 &dev_attr_last_known_reservation_state.attr,
1662 &dev_attr_safe_offline.attr,
1663 &dev_attr_host_access_count.attr,
1664 &dev_attr_path_masks.attr,
1665 &dev_attr_path_threshold.attr,
1666 &dev_attr_path_autodisable.attr,
1667 &dev_attr_path_interval.attr,
1668 &dev_attr_path_reset.attr,
1669 &dev_attr_hpf.attr,
1670 NULL,
1671 };
1672
1673 static const struct attribute_group dasd_attr_group = {
1674 .attrs = dasd_attrs,
1675 };
1676
1677 /*
1678 * Return value of the specified feature.
1679 */
1680 int
dasd_get_feature(struct ccw_device * cdev,int feature)1681 dasd_get_feature(struct ccw_device *cdev, int feature)
1682 {
1683 struct dasd_devmap *devmap;
1684
1685 devmap = dasd_find_busid(dev_name(&cdev->dev));
1686 if (IS_ERR(devmap))
1687 return PTR_ERR(devmap);
1688
1689 return ((devmap->features & feature) != 0);
1690 }
1691
1692 /*
1693 * Set / reset given feature.
1694 * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1695 */
1696 int
dasd_set_feature(struct ccw_device * cdev,int feature,int flag)1697 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1698 {
1699 struct dasd_devmap *devmap;
1700
1701 devmap = dasd_devmap_from_cdev(cdev);
1702 if (IS_ERR(devmap))
1703 return PTR_ERR(devmap);
1704
1705 spin_lock(&dasd_devmap_lock);
1706 if (flag)
1707 devmap->features |= feature;
1708 else
1709 devmap->features &= ~feature;
1710 if (devmap->device)
1711 devmap->device->features = devmap->features;
1712 spin_unlock(&dasd_devmap_lock);
1713 return 0;
1714 }
1715 EXPORT_SYMBOL(dasd_set_feature);
1716
1717
1718 int
dasd_add_sysfs_files(struct ccw_device * cdev)1719 dasd_add_sysfs_files(struct ccw_device *cdev)
1720 {
1721 return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1722 }
1723
1724 void
dasd_remove_sysfs_files(struct ccw_device * cdev)1725 dasd_remove_sysfs_files(struct ccw_device *cdev)
1726 {
1727 sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1728 }
1729
1730
1731 int
dasd_devmap_init(void)1732 dasd_devmap_init(void)
1733 {
1734 int i;
1735
1736 /* Initialize devmap structures. */
1737 dasd_max_devindex = 0;
1738 for (i = 0; i < 256; i++)
1739 INIT_LIST_HEAD(&dasd_hashlists[i]);
1740 return 0;
1741 }
1742
1743 void
dasd_devmap_exit(void)1744 dasd_devmap_exit(void)
1745 {
1746 dasd_forget_ranges();
1747 }
1748