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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / s390 / block / dasd_devmap.c
blobdd46e96a3034239b875a4ea3eeb9f5c8f01c4db3
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 <linux/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 dasd_generic_free_discipline(device);
621 /* Disconnect dasd_device structure from ccw_device structure. */
622 cdev = device->cdev;
623 device->cdev = NULL;
624
625 /* Put ccw_device structure. */
626 put_device(&cdev->dev);
627
628 /* Now the device structure can be freed. */
629 dasd_free_device(device);
630 }
631
632 /*
633 * Reference counter dropped to zero. Wake up waiter
634 * in dasd_delete_device.
635 */
636 void
637 dasd_put_device_wake(struct dasd_device *device)
638 {
639 wake_up(&dasd_delete_wq);
640 }
641 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
642
643 /*
644 * Return dasd_device structure associated with cdev.
645 * This function needs to be called with the ccw device
646 * lock held. It can be used from interrupt context.
647 */
648 struct dasd_device *
649 dasd_device_from_cdev_locked(struct ccw_device *cdev)
650 {
651 struct dasd_device *device = dev_get_drvdata(&cdev->dev);
652
653 if (!device)
654 return ERR_PTR(-ENODEV);
655 dasd_get_device(device);
656 return device;
657 }
658
659 /*
660 * Return dasd_device structure associated with cdev.
661 */
662 struct dasd_device *
663 dasd_device_from_cdev(struct ccw_device *cdev)
664 {
665 struct dasd_device *device;
666 unsigned long flags;
667
668 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
669 device = dasd_device_from_cdev_locked(cdev);
670 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
671 return device;
672 }
673
674 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
675 {
676 struct dasd_devmap *devmap;
677
678 devmap = dasd_find_busid(dev_name(&device->cdev->dev));
679 if (IS_ERR(devmap))
680 return;
681 spin_lock(&dasd_devmap_lock);
682 gdp->private_data = devmap;
683 spin_unlock(&dasd_devmap_lock);
684 }
685
686 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
687 {
688 struct dasd_device *device;
689 struct dasd_devmap *devmap;
690
691 if (!gdp->private_data)
692 return NULL;
693 device = NULL;
694 spin_lock(&dasd_devmap_lock);
695 devmap = gdp->private_data;
696 if (devmap && devmap->device) {
697 device = devmap->device;
698 dasd_get_device(device);
699 }
700 spin_unlock(&dasd_devmap_lock);
701 return device;
702 }
703
704 /*
705 * SECTION: files in sysfs
706 */
707
708 /*
709 * failfast controls the behaviour, if no path is available
710 */
711 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
712 char *buf)
713 {
714 struct dasd_devmap *devmap;
715 int ff_flag;
716
717 devmap = dasd_find_busid(dev_name(dev));
718 if (!IS_ERR(devmap))
719 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
720 else
721 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
722 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
723 }
724
725 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
726 const char *buf, size_t count)
727 {
728 unsigned int val;
729 int rc;
730
731 if (kstrtouint(buf, 0, &val) || val > 1)
732 return -EINVAL;
733
734 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val);
735
736 return rc ? : count;
737 }
738
739 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
740
741 /*
742 * readonly controls the readonly status of a dasd
743 */
744 static ssize_t
745 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
746 {
747 struct dasd_devmap *devmap;
748 int ro_flag;
749
750 devmap = dasd_find_busid(dev_name(dev));
751 if (!IS_ERR(devmap))
752 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
753 else
754 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
755 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
756 }
757
758 static ssize_t
759 dasd_ro_store(struct device *dev, struct device_attribute *attr,
760 const char *buf, size_t count)
761 {
762 struct ccw_device *cdev = to_ccwdev(dev);
763 struct dasd_device *device;
764 unsigned long flags;
765 unsigned int val;
766 int rc;
767
768 if (kstrtouint(buf, 0, &val) || val > 1)
769 return -EINVAL;
770
771 rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val);
772 if (rc)
773 return rc;
774
775 device = dasd_device_from_cdev(cdev);
776 if (IS_ERR(device))
777 return PTR_ERR(device);
778
779 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
780 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
781
782 if (!device->block || !device->block->gdp ||
783 test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
784 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
785 goto out;
786 }
787 /* Increase open_count to avoid losing the block device */
788 atomic_inc(&device->block->open_count);
789 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
790
791 set_disk_ro(device->block->gdp, val);
792 atomic_dec(&device->block->open_count);
793
794 out:
795 dasd_put_device(device);
796
797 return count;
798 }
799
800 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
801 /*
802 * erplog controls the logging of ERP related data
803 * (e.g. failing channel programs).
804 */
805 static ssize_t
806 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
807 {
808 struct dasd_devmap *devmap;
809 int erplog;
810
811 devmap = dasd_find_busid(dev_name(dev));
812 if (!IS_ERR(devmap))
813 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
814 else
815 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
816 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
817 }
818
819 static ssize_t
820 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
821 const char *buf, size_t count)
822 {
823 unsigned int val;
824 int rc;
825
826 if (kstrtouint(buf, 0, &val) || val > 1)
827 return -EINVAL;
828
829 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val);
830
831 return rc ? : count;
832 }
833
834 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
835
836 /*
837 * use_diag controls whether the driver should use diag rather than ssch
838 * to talk to the device
839 */
840 static ssize_t
841 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
842 {
843 struct dasd_devmap *devmap;
844 int use_diag;
845
846 devmap = dasd_find_busid(dev_name(dev));
847 if (!IS_ERR(devmap))
848 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
849 else
850 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
851 return sprintf(buf, use_diag ? "1\n" : "0\n");
852 }
853
854 static ssize_t
855 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
856 const char *buf, size_t count)
857 {
858 struct dasd_devmap *devmap;
859 unsigned int val;
860 ssize_t rc;
861
862 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
863 if (IS_ERR(devmap))
864 return PTR_ERR(devmap);
865
866 if (kstrtouint(buf, 0, &val) || val > 1)
867 return -EINVAL;
868
869 spin_lock(&dasd_devmap_lock);
870 /* Changing diag discipline flag is only allowed in offline state. */
871 rc = count;
872 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
873 if (val)
874 devmap->features |= DASD_FEATURE_USEDIAG;
875 else
876 devmap->features &= ~DASD_FEATURE_USEDIAG;
877 } else
878 rc = -EPERM;
879 spin_unlock(&dasd_devmap_lock);
880 return rc;
881 }
882
883 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
884
885 /*
886 * use_raw controls whether the driver should give access to raw eckd data or
887 * operate in standard mode
888 */
889 static ssize_t
890 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
891 {
892 struct dasd_devmap *devmap;
893 int use_raw;
894
895 devmap = dasd_find_busid(dev_name(dev));
896 if (!IS_ERR(devmap))
897 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
898 else
899 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
900 return sprintf(buf, use_raw ? "1\n" : "0\n");
901 }
902
903 static ssize_t
904 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
905 const char *buf, size_t count)
906 {
907 struct dasd_devmap *devmap;
908 ssize_t rc;
909 unsigned long val;
910
911 devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
912 if (IS_ERR(devmap))
913 return PTR_ERR(devmap);
914
915 if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
916 return -EINVAL;
917
918 spin_lock(&dasd_devmap_lock);
919 /* Changing diag discipline flag is only allowed in offline state. */
920 rc = count;
921 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
922 if (val)
923 devmap->features |= DASD_FEATURE_USERAW;
924 else
925 devmap->features &= ~DASD_FEATURE_USERAW;
926 } else
927 rc = -EPERM;
928 spin_unlock(&dasd_devmap_lock);
929 return rc;
930 }
931
932 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
933 dasd_use_raw_store);
934
935 static ssize_t
936 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
937 const char *buf, size_t count)
938 {
939 struct ccw_device *cdev = to_ccwdev(dev);
940 struct dasd_device *device;
941 int rc;
942
943 device = dasd_device_from_cdev(cdev);
944 if (IS_ERR(device)) {
945 rc = PTR_ERR(device);
946 goto out;
947 }
948
949 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
950 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
951 /* Already doing offline processing */
952 dasd_put_device(device);
953 rc = -EBUSY;
954 goto out;
955 }
956
957 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
958 dasd_put_device(device);
959
960 rc = ccw_device_set_offline(cdev);
961
962 out:
963 return rc ? rc : count;
964 }
965
966 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
967
968 static ssize_t
969 dasd_access_show(struct device *dev, struct device_attribute *attr,
970 char *buf)
971 {
972 struct ccw_device *cdev = to_ccwdev(dev);
973 struct dasd_device *device;
974 int count;
975
976 device = dasd_device_from_cdev(cdev);
977 if (IS_ERR(device))
978 return PTR_ERR(device);
979
980 if (!device->discipline)
981 count = -ENODEV;
982 else if (!device->discipline->host_access_count)
983 count = -EOPNOTSUPP;
984 else
985 count = device->discipline->host_access_count(device);
986
987 dasd_put_device(device);
988 if (count < 0)
989 return count;
990
991 return sprintf(buf, "%d\n", count);
992 }
993
994 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL);
995
996 static ssize_t
997 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
998 char *buf)
999 {
1000 struct dasd_device *device;
1001 ssize_t len;
1002
1003 device = dasd_device_from_cdev(to_ccwdev(dev));
1004 if (IS_ERR(device))
1005 goto out;
1006 else if (!device->discipline) {
1007 dasd_put_device(device);
1008 goto out;
1009 } else {
1010 len = snprintf(buf, PAGE_SIZE, "%s\n",
1011 device->discipline->name);
1012 dasd_put_device(device);
1013 return len;
1014 }
1015 out:
1016 len = snprintf(buf, PAGE_SIZE, "none\n");
1017 return len;
1018 }
1019
1020 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1021
1022 static ssize_t
1023 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1024 char *buf)
1025 {
1026 struct dasd_device *device;
1027 ssize_t len;
1028
1029 device = dasd_device_from_cdev(to_ccwdev(dev));
1030 if (!IS_ERR(device)) {
1031 switch (device->state) {
1032 case DASD_STATE_NEW:
1033 len = snprintf(buf, PAGE_SIZE, "new\n");
1034 break;
1035 case DASD_STATE_KNOWN:
1036 len = snprintf(buf, PAGE_SIZE, "detected\n");
1037 break;
1038 case DASD_STATE_BASIC:
1039 len = snprintf(buf, PAGE_SIZE, "basic\n");
1040 break;
1041 case DASD_STATE_UNFMT:
1042 len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1043 break;
1044 case DASD_STATE_READY:
1045 len = snprintf(buf, PAGE_SIZE, "ready\n");
1046 break;
1047 case DASD_STATE_ONLINE:
1048 len = snprintf(buf, PAGE_SIZE, "online\n");
1049 break;
1050 default:
1051 len = snprintf(buf, PAGE_SIZE, "no stat\n");
1052 break;
1053 }
1054 dasd_put_device(device);
1055 } else
1056 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1057 return len;
1058 }
1059
1060 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1061
1062 static ssize_t dasd_alias_show(struct device *dev,
1063 struct device_attribute *attr, char *buf)
1064 {
1065 struct dasd_device *device;
1066 struct dasd_uid uid;
1067
1068 device = dasd_device_from_cdev(to_ccwdev(dev));
1069 if (IS_ERR(device))
1070 return sprintf(buf, "0\n");
1071
1072 if (device->discipline && device->discipline->get_uid &&
1073 !device->discipline->get_uid(device, &uid)) {
1074 if (uid.type == UA_BASE_PAV_ALIAS ||
1075 uid.type == UA_HYPER_PAV_ALIAS) {
1076 dasd_put_device(device);
1077 return sprintf(buf, "1\n");
1078 }
1079 }
1080 dasd_put_device(device);
1081
1082 return sprintf(buf, "0\n");
1083 }
1084
1085 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1086
1087 static ssize_t dasd_vendor_show(struct device *dev,
1088 struct device_attribute *attr, char *buf)
1089 {
1090 struct dasd_device *device;
1091 struct dasd_uid uid;
1092 char *vendor;
1093
1094 device = dasd_device_from_cdev(to_ccwdev(dev));
1095 vendor = "";
1096 if (IS_ERR(device))
1097 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1098
1099 if (device->discipline && device->discipline->get_uid &&
1100 !device->discipline->get_uid(device, &uid))
1101 vendor = uid.vendor;
1102
1103 dasd_put_device(device);
1104
1105 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1106 }
1107
1108 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1109
1110 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
1111 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
1112 /* vduit */ 32 + 1)
1113
1114 static ssize_t
1115 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1116 {
1117 struct dasd_device *device;
1118 struct dasd_uid uid;
1119 char uid_string[UID_STRLEN];
1120 char ua_string[3];
1121
1122 device = dasd_device_from_cdev(to_ccwdev(dev));
1123 uid_string[0] = 0;
1124 if (IS_ERR(device))
1125 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1126
1127 if (device->discipline && device->discipline->get_uid &&
1128 !device->discipline->get_uid(device, &uid)) {
1129 switch (uid.type) {
1130 case UA_BASE_DEVICE:
1131 snprintf(ua_string, sizeof(ua_string), "%02x",
1132 uid.real_unit_addr);
1133 break;
1134 case UA_BASE_PAV_ALIAS:
1135 snprintf(ua_string, sizeof(ua_string), "%02x",
1136 uid.base_unit_addr);
1137 break;
1138 case UA_HYPER_PAV_ALIAS:
1139 snprintf(ua_string, sizeof(ua_string), "xx");
1140 break;
1141 default:
1142 /* should not happen, treat like base device */
1143 snprintf(ua_string, sizeof(ua_string), "%02x",
1144 uid.real_unit_addr);
1145 break;
1146 }
1147
1148 if (strlen(uid.vduit) > 0)
1149 snprintf(uid_string, sizeof(uid_string),
1150 "%s.%s.%04x.%s.%s",
1151 uid.vendor, uid.serial, uid.ssid, ua_string,
1152 uid.vduit);
1153 else
1154 snprintf(uid_string, sizeof(uid_string),
1155 "%s.%s.%04x.%s",
1156 uid.vendor, uid.serial, uid.ssid, ua_string);
1157 }
1158 dasd_put_device(device);
1159
1160 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1161 }
1162 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1163
1164 /*
1165 * extended error-reporting
1166 */
1167 static ssize_t
1168 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1169 {
1170 struct dasd_devmap *devmap;
1171 int eer_flag;
1172
1173 devmap = dasd_find_busid(dev_name(dev));
1174 if (!IS_ERR(devmap) && devmap->device)
1175 eer_flag = dasd_eer_enabled(devmap->device);
1176 else
1177 eer_flag = 0;
1178 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1179 }
1180
1181 static ssize_t
1182 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1183 const char *buf, size_t count)
1184 {
1185 struct dasd_device *device;
1186 unsigned int val;
1187 int rc = 0;
1188
1189 device = dasd_device_from_cdev(to_ccwdev(dev));
1190 if (IS_ERR(device))
1191 return PTR_ERR(device);
1192
1193 if (kstrtouint(buf, 0, &val) || val > 1)
1194 return -EINVAL;
1195
1196 if (val)
1197 rc = dasd_eer_enable(device);
1198 else
1199 dasd_eer_disable(device);
1200
1201 dasd_put_device(device);
1202
1203 return rc ? : count;
1204 }
1205
1206 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1207
1208 /*
1209 * expiration time for default requests
1210 */
1211 static ssize_t
1212 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1213 {
1214 struct dasd_device *device;
1215 int len;
1216
1217 device = dasd_device_from_cdev(to_ccwdev(dev));
1218 if (IS_ERR(device))
1219 return -ENODEV;
1220 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1221 dasd_put_device(device);
1222 return len;
1223 }
1224
1225 static ssize_t
1226 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1227 const char *buf, size_t count)
1228 {
1229 struct dasd_device *device;
1230 unsigned long val;
1231
1232 device = dasd_device_from_cdev(to_ccwdev(dev));
1233 if (IS_ERR(device))
1234 return -ENODEV;
1235
1236 if ((kstrtoul(buf, 10, &val) != 0) ||
1237 (val > DASD_EXPIRES_MAX) || val == 0) {
1238 dasd_put_device(device);
1239 return -EINVAL;
1240 }
1241
1242 if (val)
1243 device->default_expires = val;
1244
1245 dasd_put_device(device);
1246 return count;
1247 }
1248
1249 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1250
1251 static ssize_t
1252 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1253 {
1254 struct dasd_device *device;
1255 int len;
1256
1257 device = dasd_device_from_cdev(to_ccwdev(dev));
1258 if (IS_ERR(device))
1259 return -ENODEV;
1260 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1261 dasd_put_device(device);
1262 return len;
1263 }
1264
1265 static ssize_t
1266 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1267 const char *buf, size_t count)
1268 {
1269 struct dasd_device *device;
1270 unsigned long val;
1271
1272 device = dasd_device_from_cdev(to_ccwdev(dev));
1273 if (IS_ERR(device))
1274 return -ENODEV;
1275
1276 if ((kstrtoul(buf, 10, &val) != 0) ||
1277 (val > DASD_RETRIES_MAX)) {
1278 dasd_put_device(device);
1279 return -EINVAL;
1280 }
1281
1282 if (val)
1283 device->default_retries = val;
1284
1285 dasd_put_device(device);
1286 return count;
1287 }
1288
1289 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1290
1291 static ssize_t
1292 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1293 char *buf)
1294 {
1295 struct dasd_device *device;
1296 int len;
1297
1298 device = dasd_device_from_cdev(to_ccwdev(dev));
1299 if (IS_ERR(device))
1300 return -ENODEV;
1301 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1302 dasd_put_device(device);
1303 return len;
1304 }
1305
1306 static ssize_t
1307 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1308 const char *buf, size_t count)
1309 {
1310 struct dasd_device *device;
1311 struct request_queue *q;
1312 unsigned long val, flags;
1313
1314 device = dasd_device_from_cdev(to_ccwdev(dev));
1315 if (IS_ERR(device) || !device->block)
1316 return -ENODEV;
1317
1318 if ((kstrtoul(buf, 10, &val) != 0) ||
1319 val > UINT_MAX / HZ) {
1320 dasd_put_device(device);
1321 return -EINVAL;
1322 }
1323 q = device->block->request_queue;
1324 if (!q) {
1325 dasd_put_device(device);
1326 return -ENODEV;
1327 }
1328 spin_lock_irqsave(&device->block->request_queue_lock, flags);
1329 if (!val)
1330 blk_queue_rq_timed_out(q, NULL);
1331 else
1332 blk_queue_rq_timed_out(q, dasd_times_out);
1333
1334 device->blk_timeout = val;
1335
1336 blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1337 spin_unlock_irqrestore(&device->block->request_queue_lock, flags);
1338
1339 dasd_put_device(device);
1340 return count;
1341 }
1342
1343 static DEVICE_ATTR(timeout, 0644,
1344 dasd_timeout_show, dasd_timeout_store);
1345
1346
1347 static ssize_t
1348 dasd_path_reset_store(struct device *dev, struct device_attribute *attr,
1349 const char *buf, size_t count)
1350 {
1351 struct dasd_device *device;
1352 unsigned int val;
1353
1354 device = dasd_device_from_cdev(to_ccwdev(dev));
1355 if (IS_ERR(device))
1356 return -ENODEV;
1357
1358 if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff)
1359 val = 0;
1360
1361 if (device->discipline && device->discipline->reset_path)
1362 device->discipline->reset_path(device, (__u8) val);
1363
1364 dasd_put_device(device);
1365 return count;
1366 }
1367
1368 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store);
1369
1370 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr,
1371 char *buf)
1372 {
1373 struct dasd_device *device;
1374 int hpf;
1375
1376 device = dasd_device_from_cdev(to_ccwdev(dev));
1377 if (IS_ERR(device))
1378 return -ENODEV;
1379 if (!device->discipline || !device->discipline->hpf_enabled) {
1380 dasd_put_device(device);
1381 return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx);
1382 }
1383 hpf = device->discipline->hpf_enabled(device);
1384 dasd_put_device(device);
1385 return snprintf(buf, PAGE_SIZE, "%d\n", hpf);
1386 }
1387
1388 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL);
1389
1390 static ssize_t dasd_reservation_policy_show(struct device *dev,
1391 struct device_attribute *attr,
1392 char *buf)
1393 {
1394 struct dasd_devmap *devmap;
1395 int rc = 0;
1396
1397 devmap = dasd_find_busid(dev_name(dev));
1398 if (IS_ERR(devmap)) {
1399 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1400 } else {
1401 spin_lock(&dasd_devmap_lock);
1402 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1403 rc = snprintf(buf, PAGE_SIZE, "fail\n");
1404 else
1405 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1406 spin_unlock(&dasd_devmap_lock);
1407 }
1408 return rc;
1409 }
1410
1411 static ssize_t dasd_reservation_policy_store(struct device *dev,
1412 struct device_attribute *attr,
1413 const char *buf, size_t count)
1414 {
1415 struct ccw_device *cdev = to_ccwdev(dev);
1416 int rc;
1417
1418 if (sysfs_streq("ignore", buf))
1419 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0);
1420 else if (sysfs_streq("fail", buf))
1421 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1);
1422 else
1423 rc = -EINVAL;
1424
1425 return rc ? : count;
1426 }
1427
1428 static DEVICE_ATTR(reservation_policy, 0644,
1429 dasd_reservation_policy_show, dasd_reservation_policy_store);
1430
1431 static ssize_t dasd_reservation_state_show(struct device *dev,
1432 struct device_attribute *attr,
1433 char *buf)
1434 {
1435 struct dasd_device *device;
1436 int rc = 0;
1437
1438 device = dasd_device_from_cdev(to_ccwdev(dev));
1439 if (IS_ERR(device))
1440 return snprintf(buf, PAGE_SIZE, "none\n");
1441
1442 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1443 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1444 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1445 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1446 else
1447 rc = snprintf(buf, PAGE_SIZE, "none\n");
1448 dasd_put_device(device);
1449 return rc;
1450 }
1451
1452 static ssize_t dasd_reservation_state_store(struct device *dev,
1453 struct device_attribute *attr,
1454 const char *buf, size_t count)
1455 {
1456 struct dasd_device *device;
1457 int rc = 0;
1458
1459 device = dasd_device_from_cdev(to_ccwdev(dev));
1460 if (IS_ERR(device))
1461 return -ENODEV;
1462 if (sysfs_streq("reset", buf))
1463 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1464 else
1465 rc = -EINVAL;
1466 dasd_put_device(device);
1467
1468 if (rc)
1469 return rc;
1470 else
1471 return count;
1472 }
1473
1474 static DEVICE_ATTR(last_known_reservation_state, 0644,
1475 dasd_reservation_state_show, dasd_reservation_state_store);
1476
1477 static ssize_t dasd_pm_show(struct device *dev,
1478 struct device_attribute *attr, char *buf)
1479 {
1480 struct dasd_device *device;
1481 u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm;
1482
1483 device = dasd_device_from_cdev(to_ccwdev(dev));
1484 if (IS_ERR(device))
1485 return sprintf(buf, "0\n");
1486
1487 opm = dasd_path_get_opm(device);
1488 nppm = dasd_path_get_nppm(device);
1489 cablepm = dasd_path_get_cablepm(device);
1490 cuirpm = dasd_path_get_cuirpm(device);
1491 hpfpm = dasd_path_get_hpfpm(device);
1492 ifccpm = dasd_path_get_ifccpm(device);
1493 dasd_put_device(device);
1494
1495 return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm,
1496 cablepm, cuirpm, hpfpm, ifccpm);
1497 }
1498
1499 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1500
1501 /*
1502 * threshold value for IFCC/CCC errors
1503 */
1504 static ssize_t
1505 dasd_path_threshold_show(struct device *dev,
1506 struct device_attribute *attr, char *buf)
1507 {
1508 struct dasd_device *device;
1509 int len;
1510
1511 device = dasd_device_from_cdev(to_ccwdev(dev));
1512 if (IS_ERR(device))
1513 return -ENODEV;
1514 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld);
1515 dasd_put_device(device);
1516 return len;
1517 }
1518
1519 static ssize_t
1520 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr,
1521 const char *buf, size_t count)
1522 {
1523 struct dasd_device *device;
1524 unsigned long flags;
1525 unsigned long val;
1526
1527 device = dasd_device_from_cdev(to_ccwdev(dev));
1528 if (IS_ERR(device))
1529 return -ENODEV;
1530
1531 if ((kstrtoul(buf, 10, &val) != 0) ||
1532 (val > DASD_THRHLD_MAX) || val == 0) {
1533 dasd_put_device(device);
1534 return -EINVAL;
1535 }
1536 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1537 if (val)
1538 device->path_thrhld = val;
1539 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1540 dasd_put_device(device);
1541 return count;
1542 }
1543
1544 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show,
1545 dasd_path_threshold_store);
1546 /*
1547 * interval for IFCC/CCC checks
1548 * meaning time with no IFCC/CCC error before the error counter
1549 * gets reset
1550 */
1551 static ssize_t
1552 dasd_path_interval_show(struct device *dev,
1553 struct device_attribute *attr, char *buf)
1554 {
1555 struct dasd_device *device;
1556 int len;
1557
1558 device = dasd_device_from_cdev(to_ccwdev(dev));
1559 if (IS_ERR(device))
1560 return -ENODEV;
1561 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval);
1562 dasd_put_device(device);
1563 return len;
1564 }
1565
1566 static ssize_t
1567 dasd_path_interval_store(struct device *dev, struct device_attribute *attr,
1568 const char *buf, size_t count)
1569 {
1570 struct dasd_device *device;
1571 unsigned long flags;
1572 unsigned long val;
1573
1574 device = dasd_device_from_cdev(to_ccwdev(dev));
1575 if (IS_ERR(device))
1576 return -ENODEV;
1577
1578 if ((kstrtoul(buf, 10, &val) != 0) ||
1579 (val > DASD_INTERVAL_MAX) || val == 0) {
1580 dasd_put_device(device);
1581 return -EINVAL;
1582 }
1583 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1584 if (val)
1585 device->path_interval = val;
1586 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1587 dasd_put_device(device);
1588 return count;
1589 }
1590
1591 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show,
1592 dasd_path_interval_store);
1593
1594
1595 static struct attribute * dasd_attrs[] = {
1596 &dev_attr_readonly.attr,
1597 &dev_attr_discipline.attr,
1598 &dev_attr_status.attr,
1599 &dev_attr_alias.attr,
1600 &dev_attr_vendor.attr,
1601 &dev_attr_uid.attr,
1602 &dev_attr_use_diag.attr,
1603 &dev_attr_raw_track_access.attr,
1604 &dev_attr_eer_enabled.attr,
1605 &dev_attr_erplog.attr,
1606 &dev_attr_failfast.attr,
1607 &dev_attr_expires.attr,
1608 &dev_attr_retries.attr,
1609 &dev_attr_timeout.attr,
1610 &dev_attr_reservation_policy.attr,
1611 &dev_attr_last_known_reservation_state.attr,
1612 &dev_attr_safe_offline.attr,
1613 &dev_attr_host_access_count.attr,
1614 &dev_attr_path_masks.attr,
1615 &dev_attr_path_threshold.attr,
1616 &dev_attr_path_interval.attr,
1617 &dev_attr_path_reset.attr,
1618 &dev_attr_hpf.attr,
1619 NULL,
1620 };
1621
1622 static struct attribute_group dasd_attr_group = {
1623 .attrs = dasd_attrs,
1624 };
1625
1626 /*
1627 * Return value of the specified feature.
1628 */
1629 int
1630 dasd_get_feature(struct ccw_device *cdev, int feature)
1631 {
1632 struct dasd_devmap *devmap;
1633
1634 devmap = dasd_find_busid(dev_name(&cdev->dev));
1635 if (IS_ERR(devmap))
1636 return PTR_ERR(devmap);
1637
1638 return ((devmap->features & feature) != 0);
1639 }
1640
1641 /*
1642 * Set / reset given feature.
1643 * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1644 */
1645 int
1646 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1647 {
1648 struct dasd_devmap *devmap;
1649
1650 devmap = dasd_devmap_from_cdev(cdev);
1651 if (IS_ERR(devmap))
1652 return PTR_ERR(devmap);
1653
1654 spin_lock(&dasd_devmap_lock);
1655 if (flag)
1656 devmap->features |= feature;
1657 else
1658 devmap->features &= ~feature;
1659 if (devmap->device)
1660 devmap->device->features = devmap->features;
1661 spin_unlock(&dasd_devmap_lock);
1662 return 0;
1663 }
1664
1665
1666 int
1667 dasd_add_sysfs_files(struct ccw_device *cdev)
1668 {
1669 return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1670 }
1671
1672 void
1673 dasd_remove_sysfs_files(struct ccw_device *cdev)
1674 {
1675 sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1676 }
1677
1678
1679 int
1680 dasd_devmap_init(void)
1681 {
1682 int i;
1683
1684 /* Initialize devmap structures. */
1685 dasd_max_devindex = 0;
1686 for (i = 0; i < 256; i++)
1687 INIT_LIST_HEAD(&dasd_hashlists[i]);
1688 return 0;
1689 }
1690
1691 void
1692 dasd_devmap_exit(void)
1693 {
1694 dasd_forget_ranges();
1695 }
Linux with added FPC-III support