b2b8c18eecedc98f32b708aa000649f35102fa93
[linux-3.10.git] / drivers / s390 / block / dasd_devmap.c
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, 0);
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_warning("%*s is not a supported device option\n",
218                                    len, str);
219                         rc = -EINVAL;
220                 }
221                 str += len;
222                 if (*str != ':')
223                         break;
224                 str++;
225         }
226         if (*str != ')') {
227                 pr_warning("A closing parenthesis ')' is missing in the "
228                            "dasd= parameter\n");
229                 rc = -EINVAL;
230         } else
231                 str++;
232         *endp = str;
233         if (rc != 0)
234                 return rc;
235         return features;
236 }
237
238 /*
239  * Try to match the first element on the comma separated parse string
240  * with one of the known keywords. If a keyword is found, take the approprate
241  * action and return a pointer to the residual string. If the first element
242  * could not be matched to any keyword then return an error code.
243  */
244 static char *
245 dasd_parse_keyword( char *parsestring ) {
246
247         char *nextcomma, *residual_str;
248         int length;
249
250         nextcomma = strchr(parsestring,',');
251         if (nextcomma) {
252                 length = nextcomma - parsestring;
253                 residual_str = nextcomma + 1;
254         } else {
255                 length = strlen(parsestring);
256                 residual_str = parsestring + length;
257         }
258         if (strncmp("autodetect", parsestring, length) == 0) {
259                 dasd_autodetect = 1;
260                 pr_info("The autodetection mode has been activated\n");
261                 return residual_str;
262         }
263         if (strncmp("probeonly", parsestring, length) == 0) {
264                 dasd_probeonly = 1;
265                 pr_info("The probeonly mode has been activated\n");
266                 return residual_str;
267         }
268         if (strncmp("nopav", parsestring, length) == 0) {
269                 if (MACHINE_IS_VM)
270                         pr_info("'nopav' is not supported on z/VM\n");
271                 else {
272                         dasd_nopav = 1;
273                         pr_info("PAV support has be deactivated\n");
274                 }
275                 return residual_str;
276         }
277         if (strncmp("nofcx", parsestring, length) == 0) {
278                 dasd_nofcx = 1;
279                 pr_info("High Performance FICON support has been "
280                         "deactivated\n");
281                 return residual_str;
282         }
283         if (strncmp("fixedbuffers", parsestring, length) == 0) {
284                 if (dasd_page_cache)
285                         return residual_str;
286                 dasd_page_cache =
287                         kmem_cache_create("dasd_page_cache", PAGE_SIZE,
288                                           PAGE_SIZE, SLAB_CACHE_DMA,
289                                           NULL);
290                 if (!dasd_page_cache)
291                         DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
292                                 "fixed buffer mode disabled.");
293                 else
294                         DBF_EVENT(DBF_INFO, "%s",
295                                  "turning on fixed buffer mode");
296                 return residual_str;
297         }
298         return ERR_PTR(-EINVAL);
299 }
300
301 /*
302  * Try to interprete the first element on the comma separated parse string
303  * as a device number or a range of devices. If the interpretation is
304  * successful, create the matching dasd_devmap entries and return a pointer
305  * to the residual string.
306  * If interpretation fails or in case of an error, return an error code.
307  */
308 static char *
309 dasd_parse_range( char *parsestring ) {
310
311         struct dasd_devmap *devmap;
312         int from, from_id0, from_id1;
313         int to, to_id0, to_id1;
314         int features, rc;
315         char bus_id[DASD_BUS_ID_SIZE+1], *str;
316
317         str = parsestring;
318         rc = dasd_busid(&str, &from_id0, &from_id1, &from);
319         if (rc == 0) {
320                 to = from;
321                 to_id0 = from_id0;
322                 to_id1 = from_id1;
323                 if (*str == '-') {
324                         str++;
325                         rc = dasd_busid(&str, &to_id0, &to_id1, &to);
326                 }
327         }
328         if (rc == 0 &&
329             (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
330                 rc = -EINVAL;
331         if (rc) {
332                 pr_err("%s is not a valid device range\n", parsestring);
333                 return ERR_PTR(rc);
334         }
335         features = dasd_feature_list(str, &str);
336         if (features < 0)
337                 return ERR_PTR(-EINVAL);
338         /* each device in dasd= parameter should be set initially online */
339         features |= DASD_FEATURE_INITIAL_ONLINE;
340         while (from <= to) {
341                 sprintf(bus_id, "%01x.%01x.%04x",
342                         from_id0, from_id1, from++);
343                 devmap = dasd_add_busid(bus_id, features);
344                 if (IS_ERR(devmap))
345                         return (char *)devmap;
346         }
347         if (*str == ',')
348                 return str + 1;
349         if (*str == '\0')
350                 return str;
351         pr_warning("The dasd= parameter value %s has an invalid ending\n",
352                    str);
353         return ERR_PTR(-EINVAL);
354 }
355
356 static char *
357 dasd_parse_next_element( char *parsestring ) {
358         char * residual_str;
359         residual_str = dasd_parse_keyword(parsestring);
360         if (!IS_ERR(residual_str))
361                 return residual_str;
362         residual_str = dasd_parse_range(parsestring);
363         return residual_str;
364 }
365
366 /*
367  * Parse parameters stored in dasd[]
368  * The 'dasd=...' parameter allows to specify a comma separated list of
369  * keywords and device ranges. When the dasd driver is build into the kernel,
370  * the complete list will be stored as one element of the dasd[] array.
371  * When the dasd driver is build as a module, then the list is broken into
372  * it's elements and each dasd[] entry contains one element.
373  */
374 int
375 dasd_parse(void)
376 {
377         int rc, i;
378         char *parsestring;
379
380         rc = 0;
381         for (i = 0; i < 256; i++) {
382                 if (dasd[i] == NULL)
383                         break;
384                 parsestring = dasd[i];
385                 /* loop over the comma separated list in the parsestring */
386                 while (*parsestring) {
387                         parsestring = dasd_parse_next_element(parsestring);
388                         if(IS_ERR(parsestring)) {
389                                 rc = PTR_ERR(parsestring);
390                                 break;
391                         }
392                 }
393                 if (rc) {
394                         DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
395                         break;
396                 }
397         }
398         return rc;
399 }
400
401 /*
402  * Add a devmap for the device specified by busid. It is possible that
403  * the devmap already exists (dasd= parameter). The order of the devices
404  * added through this function will define the kdevs for the individual
405  * devices.
406  */
407 static struct dasd_devmap *
408 dasd_add_busid(const char *bus_id, int features)
409 {
410         struct dasd_devmap *devmap, *new, *tmp;
411         int hash;
412
413         new = (struct dasd_devmap *)
414                 kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
415         if (!new)
416                 return ERR_PTR(-ENOMEM);
417         spin_lock(&dasd_devmap_lock);
418         devmap = NULL;
419         hash = dasd_hash_busid(bus_id);
420         list_for_each_entry(tmp, &dasd_hashlists[hash], list)
421                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
422                         devmap = tmp;
423                         break;
424                 }
425         if (!devmap) {
426                 /* This bus_id is new. */
427                 new->devindex = dasd_max_devindex++;
428                 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
429                 new->features = features;
430                 new->device = NULL;
431                 list_add(&new->list, &dasd_hashlists[hash]);
432                 devmap = new;
433                 new = NULL;
434         }
435         spin_unlock(&dasd_devmap_lock);
436         kfree(new);
437         return devmap;
438 }
439
440 /*
441  * Find devmap for device with given bus_id.
442  */
443 static struct dasd_devmap *
444 dasd_find_busid(const char *bus_id)
445 {
446         struct dasd_devmap *devmap, *tmp;
447         int hash;
448
449         spin_lock(&dasd_devmap_lock);
450         devmap = ERR_PTR(-ENODEV);
451         hash = dasd_hash_busid(bus_id);
452         list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
453                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
454                         devmap = tmp;
455                         break;
456                 }
457         }
458         spin_unlock(&dasd_devmap_lock);
459         return devmap;
460 }
461
462 /*
463  * Check if busid has been added to the list of dasd ranges.
464  */
465 int
466 dasd_busid_known(const char *bus_id)
467 {
468         return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
469 }
470
471 /*
472  * Forget all about the device numbers added so far.
473  * This may only be called at module unload or system shutdown.
474  */
475 static void
476 dasd_forget_ranges(void)
477 {
478         struct dasd_devmap *devmap, *n;
479         int i;
480
481         spin_lock(&dasd_devmap_lock);
482         for (i = 0; i < 256; i++) {
483                 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
484                         BUG_ON(devmap->device != NULL);
485                         list_del(&devmap->list);
486                         kfree(devmap);
487                 }
488         }
489         spin_unlock(&dasd_devmap_lock);
490 }
491
492 /*
493  * Find the device struct by its device index.
494  */
495 struct dasd_device *
496 dasd_device_from_devindex(int devindex)
497 {
498         struct dasd_devmap *devmap, *tmp;
499         struct dasd_device *device;
500         int i;
501
502         spin_lock(&dasd_devmap_lock);
503         devmap = NULL;
504         for (i = 0; (i < 256) && !devmap; i++)
505                 list_for_each_entry(tmp, &dasd_hashlists[i], list)
506                         if (tmp->devindex == devindex) {
507                                 /* Found the devmap for the device. */
508                                 devmap = tmp;
509                                 break;
510                         }
511         if (devmap && devmap->device) {
512                 device = devmap->device;
513                 dasd_get_device(device);
514         } else
515                 device = ERR_PTR(-ENODEV);
516         spin_unlock(&dasd_devmap_lock);
517         return device;
518 }
519
520 /*
521  * Return devmap for cdev. If no devmap exists yet, create one and
522  * connect it to the cdev.
523  */
524 static struct dasd_devmap *
525 dasd_devmap_from_cdev(struct ccw_device *cdev)
526 {
527         struct dasd_devmap *devmap;
528
529         devmap = dasd_find_busid(dev_name(&cdev->dev));
530         if (IS_ERR(devmap))
531                 devmap = dasd_add_busid(dev_name(&cdev->dev),
532                                         DASD_FEATURE_DEFAULT);
533         return devmap;
534 }
535
536 /*
537  * Create a dasd device structure for cdev.
538  */
539 struct dasd_device *
540 dasd_create_device(struct ccw_device *cdev)
541 {
542         struct dasd_devmap *devmap;
543         struct dasd_device *device;
544         unsigned long flags;
545         int rc;
546
547         devmap = dasd_devmap_from_cdev(cdev);
548         if (IS_ERR(devmap))
549                 return (void *) devmap;
550
551         device = dasd_alloc_device();
552         if (IS_ERR(device))
553                 return device;
554         atomic_set(&device->ref_count, 3);
555
556         spin_lock(&dasd_devmap_lock);
557         if (!devmap->device) {
558                 devmap->device = device;
559                 device->devindex = devmap->devindex;
560                 device->features = devmap->features;
561                 get_device(&cdev->dev);
562                 device->cdev = cdev;
563                 rc = 0;
564         } else
565                 /* Someone else was faster. */
566                 rc = -EBUSY;
567         spin_unlock(&dasd_devmap_lock);
568
569         if (rc) {
570                 dasd_free_device(device);
571                 return ERR_PTR(rc);
572         }
573
574         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
575         dev_set_drvdata(&cdev->dev, device);
576         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
577
578         return device;
579 }
580
581 /*
582  * Wait queue for dasd_delete_device waits.
583  */
584 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
585
586 /*
587  * Remove a dasd device structure. The passed referenced
588  * is destroyed.
589  */
590 void
591 dasd_delete_device(struct dasd_device *device)
592 {
593         struct ccw_device *cdev;
594         struct dasd_devmap *devmap;
595         unsigned long flags;
596
597         /* First remove device pointer from devmap. */
598         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
599         BUG_ON(IS_ERR(devmap));
600         spin_lock(&dasd_devmap_lock);
601         if (devmap->device != device) {
602                 spin_unlock(&dasd_devmap_lock);
603                 dasd_put_device(device);
604                 return;
605         }
606         devmap->device = NULL;
607         spin_unlock(&dasd_devmap_lock);
608
609         /* Disconnect dasd_device structure from ccw_device structure. */
610         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
611         dev_set_drvdata(&device->cdev->dev, NULL);
612         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
613
614         /*
615          * Drop ref_count by 3, one for the devmap reference, one for
616          * the cdev reference and one for the passed reference.
617          */
618         atomic_sub(3, &device->ref_count);
619
620         /* Wait for reference counter to drop to zero. */
621         wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
622
623         /* Disconnect dasd_device structure from ccw_device structure. */
624         cdev = device->cdev;
625         device->cdev = NULL;
626
627         /* Put ccw_device structure. */
628         put_device(&cdev->dev);
629
630         /* Now the device structure can be freed. */
631         dasd_free_device(device);
632 }
633
634 /*
635  * Reference counter dropped to zero. Wake up waiter
636  * in dasd_delete_device.
637  */
638 void
639 dasd_put_device_wake(struct dasd_device *device)
640 {
641         wake_up(&dasd_delete_wq);
642 }
643 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
644
645 /*
646  * Return dasd_device structure associated with cdev.
647  * This function needs to be called with the ccw device
648  * lock held. It can be used from interrupt context.
649  */
650 struct dasd_device *
651 dasd_device_from_cdev_locked(struct ccw_device *cdev)
652 {
653         struct dasd_device *device = dev_get_drvdata(&cdev->dev);
654
655         if (!device)
656                 return ERR_PTR(-ENODEV);
657         dasd_get_device(device);
658         return device;
659 }
660
661 /*
662  * Return dasd_device structure associated with cdev.
663  */
664 struct dasd_device *
665 dasd_device_from_cdev(struct ccw_device *cdev)
666 {
667         struct dasd_device *device;
668         unsigned long flags;
669
670         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
671         device = dasd_device_from_cdev_locked(cdev);
672         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
673         return device;
674 }
675
676 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
677 {
678         struct dasd_devmap *devmap;
679
680         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
681         if (IS_ERR(devmap))
682                 return;
683         spin_lock(&dasd_devmap_lock);
684         gdp->private_data = devmap;
685         spin_unlock(&dasd_devmap_lock);
686 }
687
688 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
689 {
690         struct dasd_device *device;
691         struct dasd_devmap *devmap;
692
693         if (!gdp->private_data)
694                 return NULL;
695         device = NULL;
696         spin_lock(&dasd_devmap_lock);
697         devmap = gdp->private_data;
698         if (devmap && devmap->device) {
699                 device = devmap->device;
700                 dasd_get_device(device);
701         }
702         spin_unlock(&dasd_devmap_lock);
703         return device;
704 }
705
706 /*
707  * SECTION: files in sysfs
708  */
709
710 /*
711  * failfast controls the behaviour, if no path is available
712  */
713 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
714                             char *buf)
715 {
716         struct dasd_devmap *devmap;
717         int ff_flag;
718
719         devmap = dasd_find_busid(dev_name(dev));
720         if (!IS_ERR(devmap))
721                 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
722         else
723                 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
724         return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
725 }
726
727 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
728               const char *buf, size_t count)
729 {
730         struct dasd_devmap *devmap;
731         int val;
732         char *endp;
733
734         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
735         if (IS_ERR(devmap))
736                 return PTR_ERR(devmap);
737
738         val = simple_strtoul(buf, &endp, 0);
739         if (((endp + 1) < (buf + count)) || (val > 1))
740                 return -EINVAL;
741
742         spin_lock(&dasd_devmap_lock);
743         if (val)
744                 devmap->features |= DASD_FEATURE_FAILFAST;
745         else
746                 devmap->features &= ~DASD_FEATURE_FAILFAST;
747         if (devmap->device)
748                 devmap->device->features = devmap->features;
749         spin_unlock(&dasd_devmap_lock);
750         return count;
751 }
752
753 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
754
755 /*
756  * readonly controls the readonly status of a dasd
757  */
758 static ssize_t
759 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
760 {
761         struct dasd_devmap *devmap;
762         int ro_flag;
763
764         devmap = dasd_find_busid(dev_name(dev));
765         if (!IS_ERR(devmap))
766                 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
767         else
768                 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
769         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
770 }
771
772 static ssize_t
773 dasd_ro_store(struct device *dev, struct device_attribute *attr,
774               const char *buf, size_t count)
775 {
776         struct dasd_devmap *devmap;
777         struct dasd_device *device;
778         int val;
779         char *endp;
780
781         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
782         if (IS_ERR(devmap))
783                 return PTR_ERR(devmap);
784
785         val = simple_strtoul(buf, &endp, 0);
786         if (((endp + 1) < (buf + count)) || (val > 1))
787                 return -EINVAL;
788
789         spin_lock(&dasd_devmap_lock);
790         if (val)
791                 devmap->features |= DASD_FEATURE_READONLY;
792         else
793                 devmap->features &= ~DASD_FEATURE_READONLY;
794         device = devmap->device;
795         if (device) {
796                 device->features = devmap->features;
797                 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
798         }
799         spin_unlock(&dasd_devmap_lock);
800         if (device && device->block && device->block->gdp)
801                 set_disk_ro(device->block->gdp, val);
802         return count;
803 }
804
805 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
806 /*
807  * erplog controls the logging of ERP related data
808  * (e.g. failing channel programs).
809  */
810 static ssize_t
811 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
812 {
813         struct dasd_devmap *devmap;
814         int erplog;
815
816         devmap = dasd_find_busid(dev_name(dev));
817         if (!IS_ERR(devmap))
818                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
819         else
820                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
821         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
822 }
823
824 static ssize_t
825 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
826               const char *buf, size_t count)
827 {
828         struct dasd_devmap *devmap;
829         int val;
830         char *endp;
831
832         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
833         if (IS_ERR(devmap))
834                 return PTR_ERR(devmap);
835
836         val = simple_strtoul(buf, &endp, 0);
837         if (((endp + 1) < (buf + count)) || (val > 1))
838                 return -EINVAL;
839
840         spin_lock(&dasd_devmap_lock);
841         if (val)
842                 devmap->features |= DASD_FEATURE_ERPLOG;
843         else
844                 devmap->features &= ~DASD_FEATURE_ERPLOG;
845         if (devmap->device)
846                 devmap->device->features = devmap->features;
847         spin_unlock(&dasd_devmap_lock);
848         return count;
849 }
850
851 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
852
853 /*
854  * use_diag controls whether the driver should use diag rather than ssch
855  * to talk to the device
856  */
857 static ssize_t
858 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
859 {
860         struct dasd_devmap *devmap;
861         int use_diag;
862
863         devmap = dasd_find_busid(dev_name(dev));
864         if (!IS_ERR(devmap))
865                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
866         else
867                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
868         return sprintf(buf, use_diag ? "1\n" : "0\n");
869 }
870
871 static ssize_t
872 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
873                     const char *buf, size_t count)
874 {
875         struct dasd_devmap *devmap;
876         ssize_t rc;
877         int val;
878         char *endp;
879
880         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
881         if (IS_ERR(devmap))
882                 return PTR_ERR(devmap);
883
884         val = simple_strtoul(buf, &endp, 0);
885         if (((endp + 1) < (buf + count)) || (val > 1))
886                 return -EINVAL;
887
888         spin_lock(&dasd_devmap_lock);
889         /* Changing diag discipline flag is only allowed in offline state. */
890         rc = count;
891         if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
892                 if (val)
893                         devmap->features |= DASD_FEATURE_USEDIAG;
894                 else
895                         devmap->features &= ~DASD_FEATURE_USEDIAG;
896         } else
897                 rc = -EPERM;
898         spin_unlock(&dasd_devmap_lock);
899         return rc;
900 }
901
902 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
903
904 /*
905  * use_raw controls whether the driver should give access to raw eckd data or
906  * operate in standard mode
907  */
908 static ssize_t
909 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
910 {
911         struct dasd_devmap *devmap;
912         int use_raw;
913
914         devmap = dasd_find_busid(dev_name(dev));
915         if (!IS_ERR(devmap))
916                 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
917         else
918                 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
919         return sprintf(buf, use_raw ? "1\n" : "0\n");
920 }
921
922 static ssize_t
923 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
924                     const char *buf, size_t count)
925 {
926         struct dasd_devmap *devmap;
927         ssize_t rc;
928         unsigned long val;
929
930         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
931         if (IS_ERR(devmap))
932                 return PTR_ERR(devmap);
933
934         if ((strict_strtoul(buf, 10, &val) != 0) || val > 1)
935                 return -EINVAL;
936
937         spin_lock(&dasd_devmap_lock);
938         /* Changing diag discipline flag is only allowed in offline state. */
939         rc = count;
940         if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
941                 if (val)
942                         devmap->features |= DASD_FEATURE_USERAW;
943                 else
944                         devmap->features &= ~DASD_FEATURE_USERAW;
945         } else
946                 rc = -EPERM;
947         spin_unlock(&dasd_devmap_lock);
948         return rc;
949 }
950
951 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
952                    dasd_use_raw_store);
953
954 static ssize_t
955 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
956                      char *buf)
957 {
958         struct dasd_device *device;
959         ssize_t len;
960
961         device = dasd_device_from_cdev(to_ccwdev(dev));
962         if (IS_ERR(device))
963                 goto out;
964         else if (!device->discipline) {
965                 dasd_put_device(device);
966                 goto out;
967         } else {
968                 len = snprintf(buf, PAGE_SIZE, "%s\n",
969                                device->discipline->name);
970                 dasd_put_device(device);
971                 return len;
972         }
973 out:
974         len = snprintf(buf, PAGE_SIZE, "none\n");
975         return len;
976 }
977
978 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
979
980 static ssize_t
981 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
982                      char *buf)
983 {
984         struct dasd_device *device;
985         ssize_t len;
986
987         device = dasd_device_from_cdev(to_ccwdev(dev));
988         if (!IS_ERR(device)) {
989                 switch (device->state) {
990                 case DASD_STATE_NEW:
991                         len = snprintf(buf, PAGE_SIZE, "new\n");
992                         break;
993                 case DASD_STATE_KNOWN:
994                         len = snprintf(buf, PAGE_SIZE, "detected\n");
995                         break;
996                 case DASD_STATE_BASIC:
997                         len = snprintf(buf, PAGE_SIZE, "basic\n");
998                         break;
999                 case DASD_STATE_UNFMT:
1000                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1001                         break;
1002                 case DASD_STATE_READY:
1003                         len = snprintf(buf, PAGE_SIZE, "ready\n");
1004                         break;
1005                 case DASD_STATE_ONLINE:
1006                         len = snprintf(buf, PAGE_SIZE, "online\n");
1007                         break;
1008                 default:
1009                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
1010                         break;
1011                 }
1012                 dasd_put_device(device);
1013         } else
1014                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1015         return len;
1016 }
1017
1018 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1019
1020 static ssize_t dasd_alias_show(struct device *dev,
1021                                struct device_attribute *attr, char *buf)
1022 {
1023         struct dasd_device *device;
1024         struct dasd_uid uid;
1025
1026         device = dasd_device_from_cdev(to_ccwdev(dev));
1027         if (IS_ERR(device))
1028                 return sprintf(buf, "0\n");
1029
1030         if (device->discipline && device->discipline->get_uid &&
1031             !device->discipline->get_uid(device, &uid)) {
1032                 if (uid.type == UA_BASE_PAV_ALIAS ||
1033                     uid.type == UA_HYPER_PAV_ALIAS) {
1034                         dasd_put_device(device);
1035                         return sprintf(buf, "1\n");
1036                 }
1037         }
1038         dasd_put_device(device);
1039
1040         return sprintf(buf, "0\n");
1041 }
1042
1043 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1044
1045 static ssize_t dasd_vendor_show(struct device *dev,
1046                                 struct device_attribute *attr, char *buf)
1047 {
1048         struct dasd_device *device;
1049         struct dasd_uid uid;
1050         char *vendor;
1051
1052         device = dasd_device_from_cdev(to_ccwdev(dev));
1053         vendor = "";
1054         if (IS_ERR(device))
1055                 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1056
1057         if (device->discipline && device->discipline->get_uid &&
1058             !device->discipline->get_uid(device, &uid))
1059                         vendor = uid.vendor;
1060
1061         dasd_put_device(device);
1062
1063         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1064 }
1065
1066 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1067
1068 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
1069                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
1070                      /* vduit */ 32 + 1)
1071
1072 static ssize_t
1073 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1074 {
1075         struct dasd_device *device;
1076         struct dasd_uid uid;
1077         char uid_string[UID_STRLEN];
1078         char ua_string[3];
1079
1080         device = dasd_device_from_cdev(to_ccwdev(dev));
1081         uid_string[0] = 0;
1082         if (IS_ERR(device))
1083                 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1084
1085         if (device->discipline && device->discipline->get_uid &&
1086             !device->discipline->get_uid(device, &uid)) {
1087                 switch (uid.type) {
1088                 case UA_BASE_DEVICE:
1089                         snprintf(ua_string, sizeof(ua_string), "%02x",
1090                                  uid.real_unit_addr);
1091                         break;
1092                 case UA_BASE_PAV_ALIAS:
1093                         snprintf(ua_string, sizeof(ua_string), "%02x",
1094                                  uid.base_unit_addr);
1095                         break;
1096                 case UA_HYPER_PAV_ALIAS:
1097                         snprintf(ua_string, sizeof(ua_string), "xx");
1098                         break;
1099                 default:
1100                         /* should not happen, treat like base device */
1101                         snprintf(ua_string, sizeof(ua_string), "%02x",
1102                                  uid.real_unit_addr);
1103                         break;
1104                 }
1105
1106                 if (strlen(uid.vduit) > 0)
1107                         snprintf(uid_string, sizeof(uid_string),
1108                                  "%s.%s.%04x.%s.%s",
1109                                  uid.vendor, uid.serial, uid.ssid, ua_string,
1110                                  uid.vduit);
1111                 else
1112                         snprintf(uid_string, sizeof(uid_string),
1113                                  "%s.%s.%04x.%s",
1114                                  uid.vendor, uid.serial, uid.ssid, ua_string);
1115         }
1116         dasd_put_device(device);
1117
1118         return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1119 }
1120 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1121
1122 /*
1123  * extended error-reporting
1124  */
1125 static ssize_t
1126 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1127 {
1128         struct dasd_devmap *devmap;
1129         int eer_flag;
1130
1131         devmap = dasd_find_busid(dev_name(dev));
1132         if (!IS_ERR(devmap) && devmap->device)
1133                 eer_flag = dasd_eer_enabled(devmap->device);
1134         else
1135                 eer_flag = 0;
1136         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1137 }
1138
1139 static ssize_t
1140 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1141                const char *buf, size_t count)
1142 {
1143         struct dasd_devmap *devmap;
1144         int val, rc;
1145         char *endp;
1146
1147         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1148         if (IS_ERR(devmap))
1149                 return PTR_ERR(devmap);
1150         if (!devmap->device)
1151                 return -ENODEV;
1152
1153         val = simple_strtoul(buf, &endp, 0);
1154         if (((endp + 1) < (buf + count)) || (val > 1))
1155                 return -EINVAL;
1156
1157         if (val) {
1158                 rc = dasd_eer_enable(devmap->device);
1159                 if (rc)
1160                         return rc;
1161         } else
1162                 dasd_eer_disable(devmap->device);
1163         return count;
1164 }
1165
1166 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1167
1168 /*
1169  * expiration time for default requests
1170  */
1171 static ssize_t
1172 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1173 {
1174         struct dasd_device *device;
1175         int len;
1176
1177         device = dasd_device_from_cdev(to_ccwdev(dev));
1178         if (IS_ERR(device))
1179                 return -ENODEV;
1180         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1181         dasd_put_device(device);
1182         return len;
1183 }
1184
1185 static ssize_t
1186 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1187                const char *buf, size_t count)
1188 {
1189         struct dasd_device *device;
1190         unsigned long val;
1191
1192         device = dasd_device_from_cdev(to_ccwdev(dev));
1193         if (IS_ERR(device))
1194                 return -ENODEV;
1195
1196         if ((strict_strtoul(buf, 10, &val) != 0) ||
1197             (val > DASD_EXPIRES_MAX) || val == 0) {
1198                 dasd_put_device(device);
1199                 return -EINVAL;
1200         }
1201
1202         if (val)
1203                 device->default_expires = val;
1204
1205         dasd_put_device(device);
1206         return count;
1207 }
1208
1209 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1210
1211 static ssize_t dasd_reservation_policy_show(struct device *dev,
1212                                             struct device_attribute *attr,
1213                                             char *buf)
1214 {
1215         struct dasd_devmap *devmap;
1216         int rc = 0;
1217
1218         devmap = dasd_find_busid(dev_name(dev));
1219         if (IS_ERR(devmap)) {
1220                 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1221         } else {
1222                 spin_lock(&dasd_devmap_lock);
1223                 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1224                         rc = snprintf(buf, PAGE_SIZE, "fail\n");
1225                 else
1226                         rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1227                 spin_unlock(&dasd_devmap_lock);
1228         }
1229         return rc;
1230 }
1231
1232 static ssize_t dasd_reservation_policy_store(struct device *dev,
1233                                              struct device_attribute *attr,
1234                                              const char *buf, size_t count)
1235 {
1236         struct dasd_devmap *devmap;
1237         int rc;
1238
1239         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1240         if (IS_ERR(devmap))
1241                 return PTR_ERR(devmap);
1242         rc = 0;
1243         spin_lock(&dasd_devmap_lock);
1244         if (sysfs_streq("ignore", buf))
1245                 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1246         else if (sysfs_streq("fail", buf))
1247                 devmap->features |= DASD_FEATURE_FAILONSLCK;
1248         else
1249                 rc = -EINVAL;
1250         if (devmap->device)
1251                 devmap->device->features = devmap->features;
1252         spin_unlock(&dasd_devmap_lock);
1253         if (rc)
1254                 return rc;
1255         else
1256                 return count;
1257 }
1258
1259 static DEVICE_ATTR(reservation_policy, 0644,
1260                    dasd_reservation_policy_show, dasd_reservation_policy_store);
1261
1262 static ssize_t dasd_reservation_state_show(struct device *dev,
1263                                            struct device_attribute *attr,
1264                                            char *buf)
1265 {
1266         struct dasd_device *device;
1267         int rc = 0;
1268
1269         device = dasd_device_from_cdev(to_ccwdev(dev));
1270         if (IS_ERR(device))
1271                 return snprintf(buf, PAGE_SIZE, "none\n");
1272
1273         if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1274                 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1275         else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1276                 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1277         else
1278                 rc = snprintf(buf, PAGE_SIZE, "none\n");
1279         dasd_put_device(device);
1280         return rc;
1281 }
1282
1283 static ssize_t dasd_reservation_state_store(struct device *dev,
1284                                             struct device_attribute *attr,
1285                                             const char *buf, size_t count)
1286 {
1287         struct dasd_device *device;
1288         int rc = 0;
1289
1290         device = dasd_device_from_cdev(to_ccwdev(dev));
1291         if (IS_ERR(device))
1292                 return -ENODEV;
1293         if (sysfs_streq("reset", buf))
1294                 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1295         else
1296                 rc = -EINVAL;
1297         dasd_put_device(device);
1298
1299         if (rc)
1300                 return rc;
1301         else
1302                 return count;
1303 }
1304
1305 static DEVICE_ATTR(last_known_reservation_state, 0644,
1306                    dasd_reservation_state_show, dasd_reservation_state_store);
1307
1308 static struct attribute * dasd_attrs[] = {
1309         &dev_attr_readonly.attr,
1310         &dev_attr_discipline.attr,
1311         &dev_attr_status.attr,
1312         &dev_attr_alias.attr,
1313         &dev_attr_vendor.attr,
1314         &dev_attr_uid.attr,
1315         &dev_attr_use_diag.attr,
1316         &dev_attr_raw_track_access.attr,
1317         &dev_attr_eer_enabled.attr,
1318         &dev_attr_erplog.attr,
1319         &dev_attr_failfast.attr,
1320         &dev_attr_expires.attr,
1321         &dev_attr_reservation_policy.attr,
1322         &dev_attr_last_known_reservation_state.attr,
1323         NULL,
1324 };
1325
1326 static struct attribute_group dasd_attr_group = {
1327         .attrs = dasd_attrs,
1328 };
1329
1330 /*
1331  * Return value of the specified feature.
1332  */
1333 int
1334 dasd_get_feature(struct ccw_device *cdev, int feature)
1335 {
1336         struct dasd_devmap *devmap;
1337
1338         devmap = dasd_find_busid(dev_name(&cdev->dev));
1339         if (IS_ERR(devmap))
1340                 return PTR_ERR(devmap);
1341
1342         return ((devmap->features & feature) != 0);
1343 }
1344
1345 /*
1346  * Set / reset given feature.
1347  * Flag indicates wether to set (!=0) or the reset (=0) the feature.
1348  */
1349 int
1350 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1351 {
1352         struct dasd_devmap *devmap;
1353
1354         devmap = dasd_find_busid(dev_name(&cdev->dev));
1355         if (IS_ERR(devmap))
1356                 return PTR_ERR(devmap);
1357
1358         spin_lock(&dasd_devmap_lock);
1359         if (flag)
1360                 devmap->features |= feature;
1361         else
1362                 devmap->features &= ~feature;
1363         if (devmap->device)
1364                 devmap->device->features = devmap->features;
1365         spin_unlock(&dasd_devmap_lock);
1366         return 0;
1367 }
1368
1369
1370 int
1371 dasd_add_sysfs_files(struct ccw_device *cdev)
1372 {
1373         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1374 }
1375
1376 void
1377 dasd_remove_sysfs_files(struct ccw_device *cdev)
1378 {
1379         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1380 }
1381
1382
1383 int
1384 dasd_devmap_init(void)
1385 {
1386         int i;
1387
1388         /* Initialize devmap structures. */
1389         dasd_max_devindex = 0;
1390         for (i = 0; i < 256; i++)
1391                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1392         return 0;
1393 }
1394
1395 void
1396 dasd_devmap_exit(void)
1397 {
1398         dasd_forget_ranges();
1399 }