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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / s390 / block / dasd_devmap.c
blob2f18f61092b52ae52e2885173e0bcd71c3d8d770
1 /*
2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999,2001
8 *
9 * Device mapping and dasd= parameter parsing functions. All devmap
10 * functions may not be called from interrupt context. In particular
11 * dasd_get_device is a no-no from interrupt context.
12 *
13 */
14
15 #define KMSG_COMPONENT "dasd"
16
17 #include <linux/ctype.h>
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
21
22 #include <asm/debug.h>
23 #include <asm/uaccess.h>
24 #include <asm/ipl.h>
25
26 /* This is ugly... */
27 #define PRINTK_HEADER "dasd_devmap:"
28 #define DASD_BUS_ID_SIZE 20
29
30 #include "dasd_int.h"
31
32 struct kmem_cache *dasd_page_cache;
33 EXPORT_SYMBOL_GPL(dasd_page_cache);
34
35 /*
36 * dasd_devmap_t is used to store the features and the relation
37 * between device number and device index. To find a dasd_devmap_t
38 * that corresponds to a device number of a device index each
39 * dasd_devmap_t is added to two linked lists, one to search by
40 * the device number and one to search by the device index. As
41 * soon as big minor numbers are available the device index list
42 * can be removed since the device number will then be identical
43 * to the device index.
44 */
45 struct dasd_devmap {
46 struct list_head list;
47 char bus_id[DASD_BUS_ID_SIZE];
48 unsigned int devindex;
49 unsigned short features;
50 struct dasd_device *device;
51 };
52
53 /*
54 * Parameter parsing functions for dasd= parameter. The syntax is:
55 * <devno> : (0x)?[0-9a-fA-F]+
56 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
57 * <feature> : ro
58 * <feature_list> : \(<feature>(:<feature>)*\)
59 * <devno-range> : <devno>(-<devno>)?<feature_list>?
60 * <busid-range> : <busid>(-<busid>)?<feature_list>?
61 * <devices> : <devno-range>|<busid-range>
62 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
63 *
64 * <dasd> : autodetect|probeonly|<devices>(,<devices>)*
65 */
66
67 int dasd_probeonly = 0; /* is true, when probeonly mode is active */
68 int dasd_autodetect = 0; /* is true, when autodetection is active */
69 int dasd_nopav = 0; /* is true, when PAV is disabled */
70 EXPORT_SYMBOL_GPL(dasd_nopav);
71 int dasd_nofcx; /* disable High Performance Ficon */
72 EXPORT_SYMBOL_GPL(dasd_nofcx);
73
74 /*
75 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
76 * it is named 'dasd' to directly be filled by insmod with the comma separated
77 * strings when running as a module.
78 */
79 static char *dasd[256];
80 module_param_array(dasd, charp, NULL, S_IRUGO);
81
82 /*
83 * Single spinlock to protect devmap and servermap structures and lists.
84 */
85 static DEFINE_SPINLOCK(dasd_devmap_lock);
86
87 /*
88 * Hash lists for devmap structures.
89 */
90 static struct list_head dasd_hashlists[256];
91 int dasd_max_devindex;
92
93 static struct dasd_devmap *dasd_add_busid(const char *, int);
94
95 static inline int
96 dasd_hash_busid(const char *bus_id)
97 {
98 int hash, i;
99
100 hash = 0;
101 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
102 hash += *bus_id;
103 return hash & 0xff;
104 }
105
106 #ifndef MODULE
107 /*
108 * The parameter parsing functions for builtin-drivers are called
109 * before kmalloc works. Store the pointers to the parameters strings
110 * into dasd[] for later processing.
111 */
112 static int __init
113 dasd_call_setup(char *str)
114 {
115 static int count = 0;
116
117 if (count < 256)
118 dasd[count++] = str;
119 return 1;
120 }
121
122 __setup ("dasd=", dasd_call_setup);
123 #endif /* #ifndef MODULE */
124
125 #define DASD_IPLDEV "ipldev"
126
127 /*
128 * Read a device busid/devno from a string.
129 */
130 static int
131
132 dasd_busid(char **str, int *id0, int *id1, int *devno)
133 {
134 int val, old_style;
135
136 /* Interpret ipldev busid */
137 if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
138 if (ipl_info.type != IPL_TYPE_CCW) {
139 pr_err("The IPL device is not a CCW device\n");
140 return -EINVAL;
141 }
142 *id0 = 0;
143 *id1 = ipl_info.data.ccw.dev_id.ssid;
144 *devno = ipl_info.data.ccw.dev_id.devno;
145 *str += strlen(DASD_IPLDEV);
146
147 return 0;
148 }
149 /* check for leading '0x' */
150 old_style = 0;
151 if ((*str)[0] == '0' && (*str)[1] == 'x') {
152 *str += 2;
153 old_style = 1;
154 }
155 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
156 return -EINVAL;
157 val = simple_strtoul(*str, str, 16);
158 if (old_style || (*str)[0] != '.') {
159 *id0 = *id1 = 0;
160 if (val < 0 || val > 0xffff)
161 return -EINVAL;
162 *devno = val;
163 return 0;
164 }
165 /* New style x.y.z busid */
166 if (val < 0 || val > 0xff)
167 return -EINVAL;
168 *id0 = val;
169 (*str)++;
170 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
171 return -EINVAL;
172 val = simple_strtoul(*str, str, 16);
173 if (val < 0 || val > 0xff || (*str)++[0] != '.')
174 return -EINVAL;
175 *id1 = val;
176 if (!isxdigit((*str)[0])) /* We require at least one hex digit */
177 return -EINVAL;
178 val = simple_strtoul(*str, str, 16);
179 if (val < 0 || val > 0xffff)
180 return -EINVAL;
181 *devno = val;
182 return 0;
183 }
184
185 /*
186 * Read colon separated list of dasd features. Currently there is
187 * only one: "ro" for read-only devices. The default feature set
188 * is empty (value 0).
189 */
190 static int
191 dasd_feature_list(char *str, char **endp)
192 {
193 int features, len, rc;
194
195 rc = 0;
196 if (*str != '(') {
197 *endp = str;
198 return DASD_FEATURE_DEFAULT;
199 }
200 str++;
201 features = 0;
202
203 while (1) {
204 for (len = 0;
205 str[len] && str[len] != ':' && str[len] != ')'; len++);
206 if (len == 2 && !strncmp(str, "ro", 2))
207 features |= DASD_FEATURE_READONLY;
208 else if (len == 4 && !strncmp(str, "diag", 4))
209 features |= DASD_FEATURE_USEDIAG;
210 else if (len == 3 && !strncmp(str, "raw", 3))
211 features |= DASD_FEATURE_USERAW;
212 else if (len == 6 && !strncmp(str, "erplog", 6))
213 features |= DASD_FEATURE_ERPLOG;
214 else if (len == 8 && !strncmp(str, "failfast", 8))
215 features |= DASD_FEATURE_FAILFAST;
216 else {
217 pr_warn("%*s is not a supported device option\n",
218 len, str);
219 rc = -EINVAL;
220 }
221 str += len;
222 if (*str != ':')
223 break;
224 str++;
225 }
226 if (*str != ')') {
227 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
228 rc = -EINVAL;
229 } else
230 str++;
231 *endp = str;
232 if (rc != 0)
233 return rc;
234 return features;
235 }
236
237 /*
238 * Try to match the first element on the comma separated parse string
239 * with one of the known keywords. If a keyword is found, take the approprate
240 * action and return a pointer to the residual string. If the first element
241 * could not be matched to any keyword then return an error code.
242 */
243 static char *
244 dasd_parse_keyword( char *parsestring ) {
245
246 char *nextcomma, *residual_str;
247 int length;
248
249 nextcomma = strchr(parsestring,',');
250 if (nextcomma) {
251 length = nextcomma - parsestring;
252 residual_str = nextcomma + 1;
253 } else {
254 length = strlen(parsestring);
255 residual_str = parsestring + length;
256 }
257 if (strncmp("autodetect", parsestring, length) == 0) {
258 dasd_autodetect = 1;
259 pr_info("The autodetection mode has been activated\n");
260 return residual_str;
261 }
262 if (strncmp("probeonly", parsestring, length) == 0) {
263 dasd_probeonly = 1;
264 pr_info("The probeonly mode has been activated\n");
265 return residual_str;
266 }
267 if (strncmp("nopav", parsestring, length) == 0) {
268 if (MACHINE_IS_VM)
269 pr_info("'nopav' is not supported on z/VM\n");
270 else {
271 dasd_nopav = 1;
272 pr_info("PAV support has be deactivated\n");
273 }
274 return residual_str;
275 }
276 if (strncmp("nofcx", parsestring, length) == 0) {
277 dasd_nofcx = 1;
278 pr_info("High Performance FICON support has been "
279 "deactivated\n");
280 return residual_str;
281 }
282 if (strncmp("fixedbuffers", parsestring, length) == 0) {
283 if (dasd_page_cache)
284 return residual_str;
285 dasd_page_cache =
286 kmem_cache_create("dasd_page_cache", PAGE_SIZE,
287 PAGE_SIZE, SLAB_CACHE_DMA,
288 NULL);
289 if (!dasd_page_cache)
290 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
291 "fixed buffer mode disabled.");
292 else
293 DBF_EVENT(DBF_INFO, "%s",
294 "turning on fixed buffer mode");
295 return residual_str;
296 }
297 return ERR_PTR(-EINVAL);
298 }
299
300 /*
301 * Try to interprete the first element on the comma separated parse string
302 * as a device number or a range of devices. If the interpretation is
303 * successful, create the matching dasd_devmap entries and return a pointer
304 * to the residual string.
305 * If interpretation fails or in case of an error, return an error code.
306 */
307 static char *
308 dasd_parse_range( char *parsestring ) {
309
310 struct dasd_devmap *devmap;
311 int from, from_id0, from_id1;
312 int to, to_id0, to_id1;
313 int features, rc;
314 char bus_id[DASD_BUS_ID_SIZE+1], *str;
315
316 str = parsestring;
317 rc = dasd_busid(&str, &from_id0, &from_id1, &from);
318 if (rc == 0) {
319 to = from;
320 to_id0 = from_id0;
321 to_id1 = from_id1;
322 if (*str == '-') {
323 str++;
324 rc = dasd_busid(&str, &to_id0, &to_id1, &to);
325 }
326 }
327 if (rc == 0 &&
328 (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
329 rc = -EINVAL;
330 if (rc) {
331 pr_err("%s is not a valid device range\n", parsestring);
332 return ERR_PTR(rc);
333 }
334 features = dasd_feature_list(str, &str);
335 if (features < 0)
336 return ERR_PTR(-EINVAL);
337 /* each device in dasd= parameter should be set initially online */
338 features |= DASD_FEATURE_INITIAL_ONLINE;
339 while (from <= to) {
340 sprintf(bus_id, "%01x.%01x.%04x",
341 from_id0, from_id1, from++);
342 devmap = dasd_add_busid(bus_id, features);
343 if (IS_ERR(devmap))
344 return (char *)devmap;
345 }
346 if (*str == ',')
347 return str + 1;
348 if (*str == '\0')
349 return str;
350 pr_warn("The dasd= parameter value %s has an invalid ending\n", str);
351 return ERR_PTR(-EINVAL);
352 }
353
354 static char *
355 dasd_parse_next_element( char *parsestring ) {
356 char * residual_str;
357 residual_str = dasd_parse_keyword(parsestring);
358 if (!IS_ERR(residual_str))
359 return residual_str;
360 residual_str = dasd_parse_range(parsestring);
361 return residual_str;
362 }
363
364 /*
365 * Parse parameters stored in dasd[]
366 * The 'dasd=...' parameter allows to specify a comma separated list of
367 * keywords and device ranges. When the dasd driver is build into the kernel,
368 * the complete list will be stored as one element of the dasd[] array.
369 * When the dasd driver is build as a module, then the list is broken into
370 * it's elements and each dasd[] entry contains one element.
371 */
372 int
373 dasd_parse(void)
374 {
375 int rc, i;
376 char *parsestring;
377
378 rc = 0;
379 for (i = 0; i < 256; i++) {
380 if (dasd[i] == NULL)
381 break;
382 parsestring = dasd[i];
383 /* loop over the comma separated list in the parsestring */
384 while (*parsestring) {
385 parsestring = dasd_parse_next_element(parsestring);
386 if(IS_ERR(parsestring)) {
387 rc = PTR_ERR(parsestring);
388 break;
389 }
390 }
391 if (rc) {
392 DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
393 break;
394 }
395 }
396 return rc;
397 }
398
399 /*
400 * Add a devmap for the device specified by busid. It is possible that
401 * the devmap already exists (dasd= parameter). The order of the devices
402 * added through this function will define the kdevs for the individual
403 * devices.
404 */
405 static struct dasd_devmap *
406 dasd_add_busid(const char *bus_id, int features)
407 {
408 struct dasd_devmap *devmap, *new, *tmp;
409 int hash;
410
411 new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
412 if (!new)
413 return ERR_PTR(-ENOMEM);
414 spin_lock(&dasd_devmap_lock);
415 devmap = NULL;
416 hash = dasd_hash_busid(bus_id);
417 list_for_each_entry(tmp, &dasd_hashlists[hash], list)
418 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
419 devmap = tmp;
420 break;
421 }
422 if (!devmap) {
423 /* This bus_id is new. */
424 new->devindex = dasd_max_devindex++;
425 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
426 new->features = features;
427 new->device = NULL;
428 list_add(&new->list, &dasd_hashlists[hash]);
429 devmap = new;
430 new = NULL;
431 }
432 spin_unlock(&dasd_devmap_lock);
433 kfree(new);
434 return devmap;
435 }
436
437 /*
438 * Find devmap for device with given bus_id.
439 */
440 static struct dasd_devmap *
441 dasd_find_busid(const char *bus_id)
442 {
443 struct dasd_devmap *devmap, *tmp;
444 int hash;
445
446 spin_lock(&dasd_devmap_lock);
447 devmap = ERR_PTR(-ENODEV);
448 hash = dasd_hash_busid(bus_id);
449 list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
450 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
451 devmap = tmp;
452 break;
453 }
454 }
455 spin_unlock(&dasd_devmap_lock);
456 return devmap;
457 }
458
459 /*
460 * Check if busid has been added to the list of dasd ranges.
461 */
462 int
463 dasd_busid_known(const char *bus_id)
464 {
465 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
466 }
467
468 /*
469 * Forget all about the device numbers added so far.
470 * This may only be called at module unload or system shutdown.
471 */
472 static void
473 dasd_forget_ranges(void)
474 {
475 struct dasd_devmap *devmap, *n;
476 int i;
477
478 spin_lock(&dasd_devmap_lock);
479 for (i = 0; i < 256; i++) {
480 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
481 BUG_ON(devmap->device != NULL);
482 list_del(&devmap->list);
483 kfree(devmap);
484 }
485 }
486 spin_unlock(&dasd_devmap_lock);
487 }
488
489 /*
490 * Find the device struct by its device index.
491 */
492 struct dasd_device *
493 dasd_device_from_devindex(int devindex)
494 {
495 struct dasd_devmap *devmap, *tmp;
496 struct dasd_device *device;
497 int i;
498
499 spin_lock(&dasd_devmap_lock);
500 devmap = NULL;
501 for (i = 0; (i < 256) && !devmap; i++)
502 list_for_each_entry(tmp, &dasd_hashlists[i], list)
503 if (tmp->devindex == devindex) {
504 /* Found the devmap for the device. */
505 devmap = tmp;
506 break;
507 }
508 if (devmap && devmap->device) {
509 device = devmap->device;
510 dasd_get_device(device);
511 } else
512 device = ERR_PTR(-ENODEV);
513 spin_unlock(&dasd_devmap_lock);
514 return device;
515 }
516
517 /*
518 * Return devmap for cdev. If no devmap exists yet, create one and
519 * connect it to the cdev.
520 */
521 static struct dasd_devmap *
522 dasd_devmap_from_cdev(struct ccw_device *cdev)
523 {
524 struct dasd_devmap *devmap;
525
526 devmap = dasd_find_busid(dev_name(&cdev->dev));
527 if (IS_ERR(devmap))
528 devmap = dasd_add_busid(dev_name(&cdev->dev),
529 DASD_FEATURE_DEFAULT);
530 return devmap;
531 }
532
533 /*
534 * Create a dasd device structure for cdev.
535 */
536 struct dasd_device *
537 dasd_create_device(struct ccw_device *cdev)
538 {
539 struct dasd_devmap *devmap;
540 struct dasd_device *device;
541 unsigned long flags;
542 int rc;
543
544 devmap = dasd_devmap_from_cdev(cdev);
545 if (IS_ERR(devmap))
546 return (void *) devmap;
547
548 device = dasd_alloc_device();
549 if (IS_ERR(device))
550 return device;
551 atomic_set(&device->ref_count, 3);
552
553 spin_lock(&dasd_devmap_lock);
554 if (!devmap->device) {
555 devmap->device = device;
556 device->devindex = devmap->devindex;
557 device->features = devmap->features;
558 get_device(&cdev->dev);
559 device->cdev = cdev;
560 rc = 0;
561 } else
562 /* Someone else was faster. */
563 rc = -EBUSY;
564 spin_unlock(&dasd_devmap_lock);
565
566 if (rc) {
567 dasd_free_device(device);
568 return ERR_PTR(rc);
569 }
570
571 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
572 dev_set_drvdata(&cdev->dev, device);
573 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
574
575 return device;
576 }
577
578 /*
579 * Wait queue for dasd_delete_device waits.
580 */
581 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
582
583 /*
584 * Remove a dasd device structure. The passed referenced
585 * is destroyed.
586 */
587 void
588 dasd_delete_device(struct dasd_device *device)
589 {
590 struct ccw_device *cdev;
591 struct dasd_devmap *devmap;
592 unsigned long flags;
593
594 /* First remove device pointer from devmap. */
595 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
596 BUG_ON(IS_ERR(devmap));
597 spin_lock(&dasd_devmap_lock);
598 if (devmap->device != device) {
599 spin_unlock(&dasd_devmap_lock);
600 dasd_put_device(device);
601 return;
602 }
603 devmap->device = NULL;
604 spin_unlock(&dasd_devmap_lock);
605
606 /* Disconnect dasd_device structure from ccw_device structure. */
607 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
608 dev_set_drvdata(&device->cdev->dev, NULL);
609 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
610
611 /*
612 * Drop ref_count by 3, one for the devmap reference, one for
613 * the cdev reference and one for the passed reference.
614 */
615 atomic_sub(3, &device->ref_count);
616
617 /* Wait for reference counter to drop to zero. */
618 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
619
620 /* Disconnect dasd_device structure from ccw_device structure. */
621 cdev = device->cdev;
622 device->cdev = NULL;
623
624 /* Put ccw_device structure. */
625 put_device(&cdev->dev);
626
627 /* Now the device structure can be freed. */
628 dasd_free_device(device);
629 }
630
631 /*
632 * Reference counter dropped to zero. Wake up waiter
633 * in dasd_delete_device.
634 */
635 void
636 dasd_put_device_wake(struct dasd_device *device)
637 {
638 wake_up(&dasd_delete_wq);
639 }
640 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
641
642 /*
643 * Return dasd_device structure associated with cdev.
644 * This function needs to be called with the ccw device
645 * lock held. It can be used from interrupt context.
646 */
647 struct dasd_device *
648 dasd_device_from_cdev_locked(struct ccw_device *cdev)
649 {
650 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
651
652 if (!device)
653 return ERR_PTR(-ENODEV);
654 dasd_get_device(device);
655 return device;
656 }
657
658 /*
659 * Return dasd_device structure associated with cdev.
660 */
661 struct dasd_device *
662 dasd_device_from_cdev(struct ccw_device *cdev)
663 {
664 struct dasd_device *device;
665 unsigned long flags;
666
667 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
668 device = dasd_device_from_cdev_locked(cdev);
669 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
670 return device;
671 }
672
673 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
674 {
675 struct dasd_devmap *devmap;
676
677 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
678 if (IS_ERR(devmap))
679 return;
680 spin_lock(&dasd_devmap_lock);
681 gdp->private_data = devmap;
682 spin_unlock(&dasd_devmap_lock);
683 }
684
685 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
686 {
687 struct dasd_device *device;
688 struct dasd_devmap *devmap;
689
690 if (!gdp->private_data)
691 return NULL;
692 device = NULL;
693 spin_lock(&dasd_devmap_lock);
694 devmap = gdp->private_data;
695 if (devmap && devmap->device) {
696 device = devmap->device;
697 dasd_get_device(device);
698 }
699 spin_unlock(&dasd_devmap_lock);
700 return device;
701 }
702
703 /*
704 * SECTION: files in sysfs
705 */
706
707 /*
708 * failfast controls the behaviour, if no path is available
709 */
710 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
711 char *buf)
712 {
713 struct dasd_devmap *devmap;
714 int ff_flag;
715
716 devmap = dasd_find_busid(dev_name(dev));
717 if (!IS_ERR(devmap))
718 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
719 else
720 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
721 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
722 }
723
724 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
725 const char *buf, size_t count)
726 {
727 struct dasd_devmap *devmap;
728 int val;
729 char *endp;
730
731 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
732 if (IS_ERR(devmap))
733 return PTR_ERR(devmap);
734
735 val = simple_strtoul(buf, &endp, 0);
736 if (((endp + 1) < (buf + count)) || (val > 1))
737 return -EINVAL;
738
739 spin_lock(&dasd_devmap_lock);
740 if (val)
741 devmap->features |= DASD_FEATURE_FAILFAST;
742 else
743 devmap->features &= ~DASD_FEATURE_FAILFAST;
744 if (devmap->device)
745 devmap->device->features = devmap->features;
746 spin_unlock(&dasd_devmap_lock);
747 return count;
748 }
749
750 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
751
752 /*
753 * readonly controls the readonly status of a dasd
754 */
755 static ssize_t
756 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
757 {
758 struct dasd_devmap *devmap;
759 int ro_flag;
760
761 devmap = dasd_find_busid(dev_name(dev));
762 if (!IS_ERR(devmap))
763 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
764 else
765 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
766 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
767 }
768
769 static ssize_t
770 dasd_ro_store(struct device *dev, struct device_attribute *attr,
771 const char *buf, size_t count)
772 {
773 struct dasd_devmap *devmap;
774 struct dasd_device *device;
775 int val;
776 char *endp;
777
778 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
779 if (IS_ERR(devmap))
780 return PTR_ERR(devmap);
781
782 val = simple_strtoul(buf, &endp, 0);
783 if (((endp + 1) < (buf + count)) || (val > 1))
784 return -EINVAL;
785
786 spin_lock(&dasd_devmap_lock);
787 if (val)
788 devmap->features |= DASD_FEATURE_READONLY;
789 else
790 devmap->features &= ~DASD_FEATURE_READONLY;
791 device = devmap->device;
792 if (device) {
793 device->features = devmap->features;
794 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
795 }
796 spin_unlock(&dasd_devmap_lock);
797 if (device && device->block && device->block->gdp)
798 set_disk_ro(device->block->gdp, val);
799 return count;
800 }
801
802 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
803 /*
804 * erplog controls the logging of ERP related data
805 * (e.g. failing channel programs).
806 */
807 static ssize_t
808 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
809 {
810 struct dasd_devmap *devmap;
811 int erplog;
812
813 devmap = dasd_find_busid(dev_name(dev));
814 if (!IS_ERR(devmap))
815 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
816 else
817 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
818 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
819 }
820
821 static ssize_t
822 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
823 const char *buf, size_t count)
824 {
825 struct dasd_devmap *devmap;
826 int val;
827 char *endp;
828
829 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
830 if (IS_ERR(devmap))
831 return PTR_ERR(devmap);
832
833 val = simple_strtoul(buf, &endp, 0);
834 if (((endp + 1) < (buf + count)) || (val > 1))
835 return -EINVAL;
836
837 spin_lock(&dasd_devmap_lock);
838 if (val)
839 devmap->features |= DASD_FEATURE_ERPLOG;
840 else
841 devmap->features &= ~DASD_FEATURE_ERPLOG;
842 if (devmap->device)
843 devmap->device->features = devmap->features;
844 spin_unlock(&dasd_devmap_lock);
845 return count;
846 }
847
848 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
849
850 /*
851 * use_diag controls whether the driver should use diag rather than ssch
852 * to talk to the device
853 */
854 static ssize_t
855 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
856 {
857 struct dasd_devmap *devmap;
858 int use_diag;
859
860 devmap = dasd_find_busid(dev_name(dev));
861 if (!IS_ERR(devmap))
862 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
863 else
864 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
865 return sprintf(buf, use_diag ? "1\n" : "0\n");
866 }
867
868 static ssize_t
869 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
870 const char *buf, size_t count)
871 {
872 struct dasd_devmap *devmap;
873 ssize_t rc;
874 int val;
875 char *endp;
876
877 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
878 if (IS_ERR(devmap))
879 return PTR_ERR(devmap);
880
881 val = simple_strtoul(buf, &endp, 0);
882 if (((endp + 1) < (buf + count)) || (val > 1))
883 return -EINVAL;
884
885 spin_lock(&dasd_devmap_lock);
886 /* Changing diag discipline flag is only allowed in offline state. */
887 rc = count;
888 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
889 if (val)
890 devmap->features |= DASD_FEATURE_USEDIAG;
891 else
892 devmap->features &= ~DASD_FEATURE_USEDIAG;
893 } else
894 rc = -EPERM;
895 spin_unlock(&dasd_devmap_lock);
896 return rc;
897 }
898
899 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
900
901 /*
902 * use_raw controls whether the driver should give access to raw eckd data or
903 * operate in standard mode
904 */
905 static ssize_t
906 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
907 {
908 struct dasd_devmap *devmap;
909 int use_raw;
910
911 devmap = dasd_find_busid(dev_name(dev));
912 if (!IS_ERR(devmap))
913 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
914 else
915 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
916 return sprintf(buf, use_raw ? "1\n" : "0\n");
917 }
918
919 static ssize_t
920 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
921 const char *buf, size_t count)
922 {
923 struct dasd_devmap *devmap;
924 ssize_t rc;
925 unsigned long val;
926
927 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
928 if (IS_ERR(devmap))
929 return PTR_ERR(devmap);
930
931 if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
932 return -EINVAL;
933
934 spin_lock(&dasd_devmap_lock);
935 /* Changing diag discipline flag is only allowed in offline state. */
936 rc = count;
937 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
938 if (val)
939 devmap->features |= DASD_FEATURE_USERAW;
940 else
941 devmap->features &= ~DASD_FEATURE_USERAW;
942 } else
943 rc = -EPERM;
944 spin_unlock(&dasd_devmap_lock);
945 return rc;
946 }
947
948 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
949 dasd_use_raw_store);
950
951 static ssize_t
952 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
953 const char *buf, size_t count)
954 {
955 struct ccw_device *cdev = to_ccwdev(dev);
956 struct dasd_device *device;
957 int rc;
958
959 device = dasd_device_from_cdev(cdev);
960 if (IS_ERR(device)) {
961 rc = PTR_ERR(device);
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 rc = -EBUSY;
970 goto out;
971 }
972
973 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
974 dasd_put_device(device);
975
976 rc = ccw_device_set_offline(cdev);
977
978 out:
979 return rc ? rc : count;
980 }
981
982 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
983
984 static ssize_t
985 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
986 char *buf)
987 {
988 struct dasd_device *device;
989 ssize_t len;
990
991 device = dasd_device_from_cdev(to_ccwdev(dev));
992 if (IS_ERR(device))
993 goto out;
994 else if (!device->discipline) {
995 dasd_put_device(device);
996 goto out;
997 } else {
998 len = snprintf(buf, PAGE_SIZE, "%s\n",
999 device->discipline->name);
1000 dasd_put_device(device);
1001 return len;
1002 }
1003 out:
1004 len = snprintf(buf, PAGE_SIZE, "none\n");
1005 return len;
1006 }
1007
1008 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1009
1010 static ssize_t
1011 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1012 char *buf)
1013 {
1014 struct dasd_device *device;
1015 ssize_t len;
1016
1017 device = dasd_device_from_cdev(to_ccwdev(dev));
1018 if (!IS_ERR(device)) {
1019 switch (device->state) {
1020 case DASD_STATE_NEW:
1021 len = snprintf(buf, PAGE_SIZE, "new\n");
1022 break;
1023 case DASD_STATE_KNOWN:
1024 len = snprintf(buf, PAGE_SIZE, "detected\n");
1025 break;
1026 case DASD_STATE_BASIC:
1027 len = snprintf(buf, PAGE_SIZE, "basic\n");
1028 break;
1029 case DASD_STATE_UNFMT:
1030 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1031 break;
1032 case DASD_STATE_READY:
1033 len = snprintf(buf, PAGE_SIZE, "ready\n");
1034 break;
1035 case DASD_STATE_ONLINE:
1036 len = snprintf(buf, PAGE_SIZE, "online\n");
1037 break;
1038 default:
1039 len = snprintf(buf, PAGE_SIZE, "no stat\n");
1040 break;
1041 }
1042 dasd_put_device(device);
1043 } else
1044 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1045 return len;
1046 }
1047
1048 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1049
1050 static ssize_t dasd_alias_show(struct device *dev,
1051 struct device_attribute *attr, char *buf)
1052 {
1053 struct dasd_device *device;
1054 struct dasd_uid uid;
1055
1056 device = dasd_device_from_cdev(to_ccwdev(dev));
1057 if (IS_ERR(device))
1058 return sprintf(buf, "0\n");
1059
1060 if (device->discipline && device->discipline->get_uid &&
1061 !device->discipline->get_uid(device, &uid)) {
1062 if (uid.type == UA_BASE_PAV_ALIAS ||
1063 uid.type == UA_HYPER_PAV_ALIAS) {
1064 dasd_put_device(device);
1065 return sprintf(buf, "1\n");
1066 }
1067 }
1068 dasd_put_device(device);
1069
1070 return sprintf(buf, "0\n");
1071 }
1072
1073 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1074
1075 static ssize_t dasd_vendor_show(struct device *dev,
1076 struct device_attribute *attr, char *buf)
1077 {
1078 struct dasd_device *device;
1079 struct dasd_uid uid;
1080 char *vendor;
1081
1082 device = dasd_device_from_cdev(to_ccwdev(dev));
1083 vendor = "";
1084 if (IS_ERR(device))
1085 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1086
1087 if (device->discipline && device->discipline->get_uid &&
1088 !device->discipline->get_uid(device, &uid))
1089 vendor = uid.vendor;
1090
1091 dasd_put_device(device);
1092
1093 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1094 }
1095
1096 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1097
1098 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1099 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1100 /* vduit */ 32 + 1)
1101
1102 static ssize_t
1103 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1104 {
1105 struct dasd_device *device;
1106 struct dasd_uid uid;
1107 char uid_string[UID_STRLEN];
1108 char ua_string[3];
1109
1110 device = dasd_device_from_cdev(to_ccwdev(dev));
1111 uid_string[0] = 0;
1112 if (IS_ERR(device))
1113 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1114
1115 if (device->discipline && device->discipline->get_uid &&
1116 !device->discipline->get_uid(device, &uid)) {
1117 switch (uid.type) {
1118 case UA_BASE_DEVICE:
1119 snprintf(ua_string, sizeof(ua_string), "%02x",
1120 uid.real_unit_addr);
1121 break;
1122 case UA_BASE_PAV_ALIAS:
1123 snprintf(ua_string, sizeof(ua_string), "%02x",
1124 uid.base_unit_addr);
1125 break;
1126 case UA_HYPER_PAV_ALIAS:
1127 snprintf(ua_string, sizeof(ua_string), "xx");
1128 break;
1129 default:
1130 /* should not happen, treat like base device */
1131 snprintf(ua_string, sizeof(ua_string), "%02x",
1132 uid.real_unit_addr);
1133 break;
1134 }
1135
1136 if (strlen(uid.vduit) > 0)
1137 snprintf(uid_string, sizeof(uid_string),
1138 "%s.%s.%04x.%s.%s",
1139 uid.vendor, uid.serial, uid.ssid, ua_string,
1140 uid.vduit);
1141 else
1142 snprintf(uid_string, sizeof(uid_string),
1143 "%s.%s.%04x.%s",
1144 uid.vendor, uid.serial, uid.ssid, ua_string);
1145 }
1146 dasd_put_device(device);
1147
1148 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1149 }
1150 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1151
1152 /*
1153 * extended error-reporting
1154 */
1155 static ssize_t
1156 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1157 {
1158 struct dasd_devmap *devmap;
1159 int eer_flag;
1160
1161 devmap = dasd_find_busid(dev_name(dev));
1162 if (!IS_ERR(devmap) && devmap->device)
1163 eer_flag = dasd_eer_enabled(devmap->device);
1164 else
1165 eer_flag = 0;
1166 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1167 }
1168
1169 static ssize_t
1170 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1171 const char *buf, size_t count)
1172 {
1173 struct dasd_devmap *devmap;
1174 int val, rc;
1175 char *endp;
1176
1177 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1178 if (IS_ERR(devmap))
1179 return PTR_ERR(devmap);
1180 if (!devmap->device)
1181 return -ENODEV;
1182
1183 val = simple_strtoul(buf, &endp, 0);
1184 if (((endp + 1) < (buf + count)) || (val > 1))
1185 return -EINVAL;
1186
1187 if (val) {
1188 rc = dasd_eer_enable(devmap->device);
1189 if (rc)
1190 return rc;
1191 } else
1192 dasd_eer_disable(devmap->device);
1193 return count;
1194 }
1195
1196 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1197
1198 /*
1199 * expiration time for default requests
1200 */
1201 static ssize_t
1202 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1203 {
1204 struct dasd_device *device;
1205 int len;
1206
1207 device = dasd_device_from_cdev(to_ccwdev(dev));
1208 if (IS_ERR(device))
1209 return -ENODEV;
1210 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1211 dasd_put_device(device);
1212 return len;
1213 }
1214
1215 static ssize_t
1216 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1217 const char *buf, size_t count)
1218 {
1219 struct dasd_device *device;
1220 unsigned long val;
1221
1222 device = dasd_device_from_cdev(to_ccwdev(dev));
1223 if (IS_ERR(device))
1224 return -ENODEV;
1225
1226 if ((kstrtoul(buf, 10, &val) != 0) ||
1227 (val > DASD_EXPIRES_MAX) || val == 0) {
1228 dasd_put_device(device);
1229 return -EINVAL;
1230 }
1231
1232 if (val)
1233 device->default_expires = val;
1234
1235 dasd_put_device(device);
1236 return count;
1237 }
1238
1239 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1240
1241 static ssize_t
1242 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1243 {
1244 struct dasd_device *device;
1245 int len;
1246
1247 device = dasd_device_from_cdev(to_ccwdev(dev));
1248 if (IS_ERR(device))
1249 return -ENODEV;
1250 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1251 dasd_put_device(device);
1252 return len;
1253 }
1254
1255 static ssize_t
1256 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1257 const char *buf, size_t count)
1258 {
1259 struct dasd_device *device;
1260 unsigned long val;
1261
1262 device = dasd_device_from_cdev(to_ccwdev(dev));
1263 if (IS_ERR(device))
1264 return -ENODEV;
1265
1266 if ((kstrtoul(buf, 10, &val) != 0) ||
1267 (val > DASD_RETRIES_MAX)) {
1268 dasd_put_device(device);
1269 return -EINVAL;
1270 }
1271
1272 if (val)
1273 device->default_retries = val;
1274
1275 dasd_put_device(device);
1276 return count;
1277 }
1278
1279 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1280
1281 static ssize_t
1282 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1283 char *buf)
1284 {
1285 struct dasd_device *device;
1286 int len;
1287
1288 device = dasd_device_from_cdev(to_ccwdev(dev));
1289 if (IS_ERR(device))
1290 return -ENODEV;
1291 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1292 dasd_put_device(device);
1293 return len;
1294 }
1295
1296 static ssize_t
1297 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1298 const char *buf, size_t count)
1299 {
1300 struct dasd_device *device;
1301 struct request_queue *q;
1302 unsigned long val, flags;
1303
1304 device = dasd_device_from_cdev(to_ccwdev(dev));
1305 if (IS_ERR(device) || !device->block)
1306 return -ENODEV;
1307
1308 if ((kstrtoul(buf, 10, &val) != 0) ||
1309 val > UINT_MAX / HZ) {
1310 dasd_put_device(device);
1311 return -EINVAL;
1312 }
1313 q = device->block->request_queue;
1314 if (!q) {
1315 dasd_put_device(device);
1316 return -ENODEV;
1317 }
1318 spin_lock_irqsave(&device->block->request_queue_lock, flags);
1319 if (!val)
1320 blk_queue_rq_timed_out(q, NULL);
1321 else
1322 blk_queue_rq_timed_out(q, dasd_times_out);
1323
1324 device->blk_timeout = val;
1325
1326 blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1327 spin_unlock_irqrestore(&device->block->request_queue_lock, flags);
1328
1329 dasd_put_device(device);
1330 return count;
1331 }
1332
1333 static DEVICE_ATTR(timeout, 0644,
1334 dasd_timeout_show, dasd_timeout_store);
1335
1336 static ssize_t dasd_reservation_policy_show(struct device *dev,
1337 struct device_attribute *attr,
1338 char *buf)
1339 {
1340 struct dasd_devmap *devmap;
1341 int rc = 0;
1342
1343 devmap = dasd_find_busid(dev_name(dev));
1344 if (IS_ERR(devmap)) {
1345 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1346 } else {
1347 spin_lock(&dasd_devmap_lock);
1348 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1349 rc = snprintf(buf, PAGE_SIZE, "fail\n");
1350 else
1351 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1352 spin_unlock(&dasd_devmap_lock);
1353 }
1354 return rc;
1355 }
1356
1357 static ssize_t dasd_reservation_policy_store(struct device *dev,
1358 struct device_attribute *attr,
1359 const char *buf, size_t count)
1360 {
1361 struct dasd_devmap *devmap;
1362 int rc;
1363
1364 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1365 if (IS_ERR(devmap))
1366 return PTR_ERR(devmap);
1367 rc = 0;
1368 spin_lock(&dasd_devmap_lock);
1369 if (sysfs_streq("ignore", buf))
1370 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1371 else if (sysfs_streq("fail", buf))
1372 devmap->features |= DASD_FEATURE_FAILONSLCK;
1373 else
1374 rc = -EINVAL;
1375 if (devmap->device)
1376 devmap->device->features = devmap->features;
1377 spin_unlock(&dasd_devmap_lock);
1378 if (rc)
1379 return rc;
1380 else
1381 return count;
1382 }
1383
1384 static DEVICE_ATTR(reservation_policy, 0644,
1385 dasd_reservation_policy_show, dasd_reservation_policy_store);
1386
1387 static ssize_t dasd_reservation_state_show(struct device *dev,
1388 struct device_attribute *attr,
1389 char *buf)
1390 {
1391 struct dasd_device *device;
1392 int rc = 0;
1393
1394 device = dasd_device_from_cdev(to_ccwdev(dev));
1395 if (IS_ERR(device))
1396 return snprintf(buf, PAGE_SIZE, "none\n");
1397
1398 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1399 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1400 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1401 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1402 else
1403 rc = snprintf(buf, PAGE_SIZE, "none\n");
1404 dasd_put_device(device);
1405 return rc;
1406 }
1407
1408 static ssize_t dasd_reservation_state_store(struct device *dev,
1409 struct device_attribute *attr,
1410 const char *buf, size_t count)
1411 {
1412 struct dasd_device *device;
1413 int rc = 0;
1414
1415 device = dasd_device_from_cdev(to_ccwdev(dev));
1416 if (IS_ERR(device))
1417 return -ENODEV;
1418 if (sysfs_streq("reset", buf))
1419 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1420 else
1421 rc = -EINVAL;
1422 dasd_put_device(device);
1423
1424 if (rc)
1425 return rc;
1426 else
1427 return count;
1428 }
1429
1430 static DEVICE_ATTR(last_known_reservation_state, 0644,
1431 dasd_reservation_state_show, dasd_reservation_state_store);
1432
1433 static ssize_t dasd_pm_show(struct device *dev,
1434 struct device_attribute *attr, char *buf)
1435 {
1436 struct dasd_device *device;
1437 u8 opm, nppm, cablepm, cuirpm, hpfpm;
1438
1439 device = dasd_device_from_cdev(to_ccwdev(dev));
1440 if (IS_ERR(device))
1441 return sprintf(buf, "0\n");
1442
1443 opm = device->path_data.opm;
1444 nppm = device->path_data.npm;
1445 cablepm = device->path_data.cablepm;
1446 cuirpm = device->path_data.cuirpm;
1447 hpfpm = device->path_data.hpfpm;
1448 dasd_put_device(device);
1449
1450 return sprintf(buf, "%02x %02x %02x %02x %02x\n", opm, nppm,
1451 cablepm, cuirpm, hpfpm);
1452 }
1453
1454 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1455
1456 static struct attribute * dasd_attrs[] = {
1457 &dev_attr_readonly.attr,
1458 &dev_attr_discipline.attr,
1459 &dev_attr_status.attr,
1460 &dev_attr_alias.attr,
1461 &dev_attr_vendor.attr,
1462 &dev_attr_uid.attr,
1463 &dev_attr_use_diag.attr,
1464 &dev_attr_raw_track_access.attr,
1465 &dev_attr_eer_enabled.attr,
1466 &dev_attr_erplog.attr,
1467 &dev_attr_failfast.attr,
1468 &dev_attr_expires.attr,
1469 &dev_attr_retries.attr,
1470 &dev_attr_timeout.attr,
1471 &dev_attr_reservation_policy.attr,
1472 &dev_attr_last_known_reservation_state.attr,
1473 &dev_attr_safe_offline.attr,
1474 &dev_attr_path_masks.attr,
1475 NULL,
1476 };
1477
1478 static struct attribute_group dasd_attr_group = {
1479 .attrs = dasd_attrs,
1480 };
1481
1482 /*
1483 * Return value of the specified feature.
1484 */
1485 int
1486 dasd_get_feature(struct ccw_device *cdev, int feature)
1487 {
1488 struct dasd_devmap *devmap;
1489
1490 devmap = dasd_find_busid(dev_name(&cdev->dev));
1491 if (IS_ERR(devmap))
1492 return PTR_ERR(devmap);
1493
1494 return ((devmap->features & feature) != 0);
1495 }
1496
1497 /*
1498 * Set / reset given feature.
1499 * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1500 */
1501 int
1502 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1503 {
1504 struct dasd_devmap *devmap;
1505
1506 devmap = dasd_find_busid(dev_name(&cdev->dev));
1507 if (IS_ERR(devmap))
1508 return PTR_ERR(devmap);
1509
1510 spin_lock(&dasd_devmap_lock);
1511 if (flag)
1512 devmap->features |= feature;
1513 else
1514 devmap->features &= ~feature;
1515 if (devmap->device)
1516 devmap->device->features = devmap->features;
1517 spin_unlock(&dasd_devmap_lock);
1518 return 0;
1519 }
1520
1521
1522 int
1523 dasd_add_sysfs_files(struct ccw_device *cdev)
1524 {
1525 return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1526 }
1527
1528 void
1529 dasd_remove_sysfs_files(struct ccw_device *cdev)
1530 {
1531 sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1532 }
1533
1534
1535 int
1536 dasd_devmap_init(void)
1537 {
1538 int i;
1539
1540 /* Initialize devmap structures. */
1541 dasd_max_devindex = 0;
1542 for (i = 0; i < 256; i++)
1543 INIT_LIST_HEAD(&dasd_hashlists[i]);
1544 return 0;
1545 }
1546
1547 void
1548 dasd_devmap_exit(void)
1549 {
1550 dasd_forget_ranges();
1551 }
Linux with added FPC-III support