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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd_devmap.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 | |
9 | * | |
10 | * Device mapping and dasd= parameter parsing functions. All devmap | |
11 | * functions may not be called from interrupt context. In particular | |
12 | * dasd_get_device is a no-no from interrupt context. | |
13 | * | |
1da177e4 LT |
14 | */ |
15 | ||
1da177e4 LT |
16 | #include <linux/ctype.h> |
17 | #include <linux/init.h> | |
8d3b33f6 | 18 | #include <linux/module.h> |
1da177e4 LT |
19 | |
20 | #include <asm/debug.h> | |
21 | #include <asm/uaccess.h> | |
22 | ||
23 | /* This is ugly... */ | |
24 | #define PRINTK_HEADER "dasd_devmap:" | |
25 | ||
26 | #include "dasd_int.h" | |
27 | ||
28 | kmem_cache_t *dasd_page_cache; | |
40545573 | 29 | EXPORT_SYMBOL_GPL(dasd_page_cache); |
1da177e4 LT |
30 | |
31 | /* | |
32 | * dasd_devmap_t is used to store the features and the relation | |
33 | * between device number and device index. To find a dasd_devmap_t | |
34 | * that corresponds to a device number of a device index each | |
35 | * dasd_devmap_t is added to two linked lists, one to search by | |
36 | * the device number and one to search by the device index. As | |
37 | * soon as big minor numbers are available the device index list | |
38 | * can be removed since the device number will then be identical | |
39 | * to the device index. | |
40 | */ | |
41 | struct dasd_devmap { | |
42 | struct list_head list; | |
43 | char bus_id[BUS_ID_SIZE]; | |
44 | unsigned int devindex; | |
45 | unsigned short features; | |
46 | struct dasd_device *device; | |
3d052595 | 47 | struct dasd_uid uid; |
1da177e4 LT |
48 | }; |
49 | ||
40545573 HH |
50 | /* |
51 | * dasd_servermap is used to store the server_id of all storage servers | |
52 | * accessed by DASD device driver. | |
53 | */ | |
54 | struct dasd_servermap { | |
55 | struct list_head list; | |
56 | struct server_id { | |
57 | char vendor[4]; | |
58 | char serial[15]; | |
59 | } sid; | |
60 | }; | |
61 | ||
62 | static struct list_head dasd_serverlist; | |
63 | ||
1da177e4 LT |
64 | /* |
65 | * Parameter parsing functions for dasd= parameter. The syntax is: | |
66 | * <devno> : (0x)?[0-9a-fA-F]+ | |
67 | * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ | |
68 | * <feature> : ro | |
69 | * <feature_list> : \(<feature>(:<feature>)*\) | |
70 | * <devno-range> : <devno>(-<devno>)?<feature_list>? | |
71 | * <busid-range> : <busid>(-<busid>)?<feature_list>? | |
72 | * <devices> : <devno-range>|<busid-range> | |
73 | * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod | |
74 | * | |
75 | * <dasd> : autodetect|probeonly|<devices>(,<devices>)* | |
76 | */ | |
77 | ||
78 | int dasd_probeonly = 0; /* is true, when probeonly mode is active */ | |
79 | int dasd_autodetect = 0; /* is true, when autodetection is active */ | |
40545573 HH |
80 | int dasd_nopav = 0; /* is true, when PAV is disabled */ |
81 | EXPORT_SYMBOL_GPL(dasd_nopav); | |
1da177e4 LT |
82 | |
83 | /* | |
84 | * char *dasd[] is intended to hold the ranges supplied by the dasd= statement | |
85 | * it is named 'dasd' to directly be filled by insmod with the comma separated | |
86 | * strings when running as a module. | |
87 | */ | |
88 | static char *dasd[256]; | |
8d3b33f6 RR |
89 | module_param_array(dasd, charp, NULL, 0); |
90 | ||
1da177e4 LT |
91 | /* |
92 | * Single spinlock to protect devmap structures and lists. | |
93 | */ | |
94 | static DEFINE_SPINLOCK(dasd_devmap_lock); | |
95 | ||
96 | /* | |
97 | * Hash lists for devmap structures. | |
98 | */ | |
99 | static struct list_head dasd_hashlists[256]; | |
100 | int dasd_max_devindex; | |
101 | ||
102 | static struct dasd_devmap *dasd_add_busid(char *, int); | |
103 | ||
104 | static inline int | |
105 | dasd_hash_busid(char *bus_id) | |
106 | { | |
107 | int hash, i; | |
108 | ||
109 | hash = 0; | |
110 | for (i = 0; (i < BUS_ID_SIZE) && *bus_id; i++, bus_id++) | |
111 | hash += *bus_id; | |
112 | return hash & 0xff; | |
113 | } | |
114 | ||
115 | #ifndef MODULE | |
116 | /* | |
117 | * The parameter parsing functions for builtin-drivers are called | |
118 | * before kmalloc works. Store the pointers to the parameters strings | |
119 | * into dasd[] for later processing. | |
120 | */ | |
121 | static int __init | |
122 | dasd_call_setup(char *str) | |
123 | { | |
124 | static int count = 0; | |
125 | ||
126 | if (count < 256) | |
127 | dasd[count++] = str; | |
128 | return 1; | |
129 | } | |
130 | ||
131 | __setup ("dasd=", dasd_call_setup); | |
132 | #endif /* #ifndef MODULE */ | |
133 | ||
134 | /* | |
135 | * Read a device busid/devno from a string. | |
136 | */ | |
137 | static inline int | |
138 | dasd_busid(char **str, int *id0, int *id1, int *devno) | |
139 | { | |
140 | int val, old_style; | |
138c014d | 141 | |
1da177e4 LT |
142 | /* check for leading '0x' */ |
143 | old_style = 0; | |
144 | if ((*str)[0] == '0' && (*str)[1] == 'x') { | |
145 | *str += 2; | |
146 | old_style = 1; | |
147 | } | |
148 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
149 | return -EINVAL; | |
150 | val = simple_strtoul(*str, str, 16); | |
151 | if (old_style || (*str)[0] != '.') { | |
152 | *id0 = *id1 = 0; | |
153 | if (val < 0 || val > 0xffff) | |
154 | return -EINVAL; | |
155 | *devno = val; | |
156 | return 0; | |
157 | } | |
158 | /* New style x.y.z busid */ | |
159 | if (val < 0 || val > 0xff) | |
160 | return -EINVAL; | |
161 | *id0 = val; | |
162 | (*str)++; | |
163 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
164 | return -EINVAL; | |
165 | val = simple_strtoul(*str, str, 16); | |
166 | if (val < 0 || val > 0xff || (*str)++[0] != '.') | |
167 | return -EINVAL; | |
168 | *id1 = val; | |
169 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
170 | return -EINVAL; | |
171 | val = simple_strtoul(*str, str, 16); | |
172 | if (val < 0 || val > 0xffff) | |
173 | return -EINVAL; | |
174 | *devno = val; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | /* | |
179 | * Read colon separated list of dasd features. Currently there is | |
180 | * only one: "ro" for read-only devices. The default feature set | |
181 | * is empty (value 0). | |
182 | */ | |
183 | static inline int | |
184 | dasd_feature_list(char *str, char **endp) | |
185 | { | |
186 | int features, len, rc; | |
187 | ||
188 | rc = 0; | |
189 | if (*str != '(') { | |
190 | *endp = str; | |
191 | return DASD_FEATURE_DEFAULT; | |
192 | } | |
193 | str++; | |
194 | features = 0; | |
195 | ||
196 | while (1) { | |
138c014d | 197 | for (len = 0; |
1da177e4 LT |
198 | str[len] && str[len] != ':' && str[len] != ')'; len++); |
199 | if (len == 2 && !strncmp(str, "ro", 2)) | |
200 | features |= DASD_FEATURE_READONLY; | |
201 | else if (len == 4 && !strncmp(str, "diag", 4)) | |
202 | features |= DASD_FEATURE_USEDIAG; | |
203 | else { | |
204 | MESSAGE(KERN_WARNING, | |
205 | "unsupported feature: %*s, " | |
206 | "ignoring setting", len, str); | |
207 | rc = -EINVAL; | |
208 | } | |
209 | str += len; | |
210 | if (*str != ':') | |
211 | break; | |
212 | str++; | |
213 | } | |
214 | if (*str != ')') { | |
215 | MESSAGE(KERN_WARNING, "%s", | |
216 | "missing ')' in dasd parameter string\n"); | |
217 | rc = -EINVAL; | |
218 | } else | |
219 | str++; | |
220 | *endp = str; | |
221 | if (rc != 0) | |
222 | return rc; | |
223 | return features; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Try to match the first element on the comma separated parse string | |
228 | * with one of the known keywords. If a keyword is found, take the approprate | |
229 | * action and return a pointer to the residual string. If the first element | |
230 | * could not be matched to any keyword then return an error code. | |
231 | */ | |
232 | static char * | |
233 | dasd_parse_keyword( char *parsestring ) { | |
234 | ||
235 | char *nextcomma, *residual_str; | |
236 | int length; | |
237 | ||
238 | nextcomma = strchr(parsestring,','); | |
239 | if (nextcomma) { | |
240 | length = nextcomma - parsestring; | |
241 | residual_str = nextcomma + 1; | |
242 | } else { | |
243 | length = strlen(parsestring); | |
244 | residual_str = parsestring + length; | |
245 | } | |
40545573 | 246 | if (strncmp("autodetect", parsestring, length) == 0) { |
1da177e4 LT |
247 | dasd_autodetect = 1; |
248 | MESSAGE (KERN_INFO, "%s", | |
249 | "turning to autodetection mode"); | |
250 | return residual_str; | |
251 | } | |
40545573 | 252 | if (strncmp("probeonly", parsestring, length) == 0) { |
1da177e4 LT |
253 | dasd_probeonly = 1; |
254 | MESSAGE(KERN_INFO, "%s", | |
255 | "turning to probeonly mode"); | |
256 | return residual_str; | |
257 | } | |
40545573 HH |
258 | if (strncmp("nopav", parsestring, length) == 0) { |
259 | dasd_nopav = 1; | |
260 | MESSAGE(KERN_INFO, "%s", "disable PAV mode"); | |
261 | return residual_str; | |
262 | } | |
263 | if (strncmp("fixedbuffers", parsestring, length) == 0) { | |
1da177e4 LT |
264 | if (dasd_page_cache) |
265 | return residual_str; | |
266 | dasd_page_cache = | |
267 | kmem_cache_create("dasd_page_cache", PAGE_SIZE, 0, | |
268 | SLAB_CACHE_DMA, NULL, NULL ); | |
269 | if (!dasd_page_cache) | |
270 | MESSAGE(KERN_WARNING, "%s", "Failed to create slab, " | |
271 | "fixed buffer mode disabled."); | |
272 | else | |
273 | MESSAGE (KERN_INFO, "%s", | |
274 | "turning on fixed buffer mode"); | |
275 | return residual_str; | |
276 | } | |
277 | return ERR_PTR(-EINVAL); | |
278 | } | |
279 | ||
280 | /* | |
281 | * Try to interprete the first element on the comma separated parse string | |
282 | * as a device number or a range of devices. If the interpretation is | |
283 | * successfull, create the matching dasd_devmap entries and return a pointer | |
284 | * to the residual string. | |
285 | * If interpretation fails or in case of an error, return an error code. | |
286 | */ | |
287 | static char * | |
288 | dasd_parse_range( char *parsestring ) { | |
289 | ||
290 | struct dasd_devmap *devmap; | |
291 | int from, from_id0, from_id1; | |
292 | int to, to_id0, to_id1; | |
293 | int features, rc; | |
294 | char bus_id[BUS_ID_SIZE+1], *str; | |
295 | ||
296 | str = parsestring; | |
297 | rc = dasd_busid(&str, &from_id0, &from_id1, &from); | |
298 | if (rc == 0) { | |
299 | to = from; | |
300 | to_id0 = from_id0; | |
301 | to_id1 = from_id1; | |
302 | if (*str == '-') { | |
303 | str++; | |
304 | rc = dasd_busid(&str, &to_id0, &to_id1, &to); | |
305 | } | |
306 | } | |
307 | if (rc == 0 && | |
308 | (from_id0 != to_id0 || from_id1 != to_id1 || from > to)) | |
309 | rc = -EINVAL; | |
310 | if (rc) { | |
311 | MESSAGE(KERN_ERR, "Invalid device range %s", parsestring); | |
312 | return ERR_PTR(rc); | |
313 | } | |
314 | features = dasd_feature_list(str, &str); | |
315 | if (features < 0) | |
316 | return ERR_PTR(-EINVAL); | |
40545573 HH |
317 | /* each device in dasd= parameter should be set initially online */ |
318 | features |= DASD_FEATURE_INITIAL_ONLINE; | |
1da177e4 LT |
319 | while (from <= to) { |
320 | sprintf(bus_id, "%01x.%01x.%04x", | |
321 | from_id0, from_id1, from++); | |
322 | devmap = dasd_add_busid(bus_id, features); | |
323 | if (IS_ERR(devmap)) | |
324 | return (char *)devmap; | |
325 | } | |
326 | if (*str == ',') | |
327 | return str + 1; | |
328 | if (*str == '\0') | |
329 | return str; | |
330 | MESSAGE(KERN_WARNING, | |
331 | "junk at end of dasd parameter string: %s\n", str); | |
332 | return ERR_PTR(-EINVAL); | |
333 | } | |
334 | ||
335 | static inline char * | |
336 | dasd_parse_next_element( char *parsestring ) { | |
337 | char * residual_str; | |
338 | residual_str = dasd_parse_keyword(parsestring); | |
339 | if (!IS_ERR(residual_str)) | |
340 | return residual_str; | |
341 | residual_str = dasd_parse_range(parsestring); | |
342 | return residual_str; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Parse parameters stored in dasd[] | |
347 | * The 'dasd=...' parameter allows to specify a comma separated list of | |
348 | * keywords and device ranges. When the dasd driver is build into the kernel, | |
349 | * the complete list will be stored as one element of the dasd[] array. | |
350 | * When the dasd driver is build as a module, then the list is broken into | |
351 | * it's elements and each dasd[] entry contains one element. | |
352 | */ | |
353 | int | |
354 | dasd_parse(void) | |
355 | { | |
356 | int rc, i; | |
357 | char *parsestring; | |
358 | ||
359 | rc = 0; | |
360 | for (i = 0; i < 256; i++) { | |
361 | if (dasd[i] == NULL) | |
362 | break; | |
363 | parsestring = dasd[i]; | |
364 | /* loop over the comma separated list in the parsestring */ | |
365 | while (*parsestring) { | |
366 | parsestring = dasd_parse_next_element(parsestring); | |
367 | if(IS_ERR(parsestring)) { | |
368 | rc = PTR_ERR(parsestring); | |
369 | break; | |
370 | } | |
371 | } | |
372 | if (rc) { | |
373 | DBF_EVENT(DBF_ALERT, "%s", "invalid range found"); | |
374 | break; | |
375 | } | |
376 | } | |
377 | return rc; | |
378 | } | |
379 | ||
380 | /* | |
381 | * Add a devmap for the device specified by busid. It is possible that | |
382 | * the devmap already exists (dasd= parameter). The order of the devices | |
383 | * added through this function will define the kdevs for the individual | |
138c014d | 384 | * devices. |
1da177e4 LT |
385 | */ |
386 | static struct dasd_devmap * | |
387 | dasd_add_busid(char *bus_id, int features) | |
388 | { | |
389 | struct dasd_devmap *devmap, *new, *tmp; | |
390 | int hash; | |
391 | ||
392 | new = (struct dasd_devmap *) | |
138c014d | 393 | kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); |
1da177e4 LT |
394 | if (!new) |
395 | return ERR_PTR(-ENOMEM); | |
396 | spin_lock(&dasd_devmap_lock); | |
397 | devmap = 0; | |
398 | hash = dasd_hash_busid(bus_id); | |
399 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) | |
400 | if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) { | |
401 | devmap = tmp; | |
402 | break; | |
403 | } | |
404 | if (!devmap) { | |
405 | /* This bus_id is new. */ | |
406 | new->devindex = dasd_max_devindex++; | |
407 | strncpy(new->bus_id, bus_id, BUS_ID_SIZE); | |
408 | new->features = features; | |
409 | new->device = 0; | |
410 | list_add(&new->list, &dasd_hashlists[hash]); | |
411 | devmap = new; | |
412 | new = 0; | |
413 | } | |
414 | spin_unlock(&dasd_devmap_lock); | |
17fd682e | 415 | kfree(new); |
1da177e4 LT |
416 | return devmap; |
417 | } | |
418 | ||
419 | /* | |
420 | * Find devmap for device with given bus_id. | |
421 | */ | |
422 | static struct dasd_devmap * | |
423 | dasd_find_busid(char *bus_id) | |
424 | { | |
425 | struct dasd_devmap *devmap, *tmp; | |
426 | int hash; | |
427 | ||
428 | spin_lock(&dasd_devmap_lock); | |
429 | devmap = ERR_PTR(-ENODEV); | |
430 | hash = dasd_hash_busid(bus_id); | |
431 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) { | |
432 | if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) { | |
433 | devmap = tmp; | |
434 | break; | |
435 | } | |
436 | } | |
437 | spin_unlock(&dasd_devmap_lock); | |
438 | return devmap; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Check if busid has been added to the list of dasd ranges. | |
443 | */ | |
444 | int | |
445 | dasd_busid_known(char *bus_id) | |
446 | { | |
447 | return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; | |
448 | } | |
449 | ||
450 | /* | |
451 | * Forget all about the device numbers added so far. | |
452 | * This may only be called at module unload or system shutdown. | |
453 | */ | |
454 | static void | |
455 | dasd_forget_ranges(void) | |
456 | { | |
457 | struct dasd_devmap *devmap, *n; | |
458 | int i; | |
459 | ||
460 | spin_lock(&dasd_devmap_lock); | |
461 | for (i = 0; i < 256; i++) { | |
462 | list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { | |
606f4422 | 463 | BUG_ON(devmap->device != NULL); |
1da177e4 LT |
464 | list_del(&devmap->list); |
465 | kfree(devmap); | |
466 | } | |
467 | } | |
468 | spin_unlock(&dasd_devmap_lock); | |
469 | } | |
470 | ||
471 | /* | |
472 | * Find the device struct by its device index. | |
473 | */ | |
474 | struct dasd_device * | |
475 | dasd_device_from_devindex(int devindex) | |
476 | { | |
477 | struct dasd_devmap *devmap, *tmp; | |
478 | struct dasd_device *device; | |
479 | int i; | |
480 | ||
481 | spin_lock(&dasd_devmap_lock); | |
482 | devmap = 0; | |
483 | for (i = 0; (i < 256) && !devmap; i++) | |
484 | list_for_each_entry(tmp, &dasd_hashlists[i], list) | |
485 | if (tmp->devindex == devindex) { | |
486 | /* Found the devmap for the device. */ | |
487 | devmap = tmp; | |
488 | break; | |
489 | } | |
490 | if (devmap && devmap->device) { | |
491 | device = devmap->device; | |
492 | dasd_get_device(device); | |
493 | } else | |
494 | device = ERR_PTR(-ENODEV); | |
495 | spin_unlock(&dasd_devmap_lock); | |
496 | return device; | |
497 | } | |
498 | ||
499 | /* | |
500 | * Return devmap for cdev. If no devmap exists yet, create one and | |
501 | * connect it to the cdev. | |
502 | */ | |
503 | static struct dasd_devmap * | |
504 | dasd_devmap_from_cdev(struct ccw_device *cdev) | |
505 | { | |
506 | struct dasd_devmap *devmap; | |
507 | ||
508 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
509 | if (IS_ERR(devmap)) | |
510 | devmap = dasd_add_busid(cdev->dev.bus_id, | |
511 | DASD_FEATURE_DEFAULT); | |
512 | return devmap; | |
513 | } | |
514 | ||
515 | /* | |
516 | * Create a dasd device structure for cdev. | |
517 | */ | |
518 | struct dasd_device * | |
519 | dasd_create_device(struct ccw_device *cdev) | |
520 | { | |
521 | struct dasd_devmap *devmap; | |
522 | struct dasd_device *device; | |
523 | int rc; | |
524 | ||
525 | devmap = dasd_devmap_from_cdev(cdev); | |
526 | if (IS_ERR(devmap)) | |
527 | return (void *) devmap; | |
528 | cdev->dev.driver_data = devmap; | |
529 | ||
530 | device = dasd_alloc_device(); | |
531 | if (IS_ERR(device)) | |
532 | return device; | |
533 | atomic_set(&device->ref_count, 2); | |
534 | ||
535 | spin_lock(&dasd_devmap_lock); | |
536 | if (!devmap->device) { | |
537 | devmap->device = device; | |
538 | device->devindex = devmap->devindex; | |
c6eb7b77 | 539 | device->features = devmap->features; |
1da177e4 LT |
540 | get_device(&cdev->dev); |
541 | device->cdev = cdev; | |
542 | rc = 0; | |
543 | } else | |
544 | /* Someone else was faster. */ | |
545 | rc = -EBUSY; | |
546 | spin_unlock(&dasd_devmap_lock); | |
547 | ||
548 | if (rc) { | |
549 | dasd_free_device(device); | |
550 | return ERR_PTR(rc); | |
551 | } | |
552 | return device; | |
553 | } | |
554 | ||
555 | /* | |
556 | * Wait queue for dasd_delete_device waits. | |
557 | */ | |
558 | static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); | |
559 | ||
560 | /* | |
561 | * Remove a dasd device structure. The passed referenced | |
562 | * is destroyed. | |
563 | */ | |
564 | void | |
565 | dasd_delete_device(struct dasd_device *device) | |
566 | { | |
567 | struct ccw_device *cdev; | |
568 | struct dasd_devmap *devmap; | |
569 | ||
570 | /* First remove device pointer from devmap. */ | |
571 | devmap = dasd_find_busid(device->cdev->dev.bus_id); | |
606f4422 | 572 | BUG_ON(IS_ERR(devmap)); |
1da177e4 LT |
573 | spin_lock(&dasd_devmap_lock); |
574 | if (devmap->device != device) { | |
575 | spin_unlock(&dasd_devmap_lock); | |
576 | dasd_put_device(device); | |
577 | return; | |
578 | } | |
579 | devmap->device = NULL; | |
580 | spin_unlock(&dasd_devmap_lock); | |
581 | ||
582 | /* Drop ref_count by 2, one for the devmap reference and | |
583 | * one for the passed reference. */ | |
584 | atomic_sub(2, &device->ref_count); | |
585 | ||
586 | /* Wait for reference counter to drop to zero. */ | |
587 | wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); | |
588 | ||
589 | /* Disconnect dasd_device structure from ccw_device structure. */ | |
590 | cdev = device->cdev; | |
591 | device->cdev = NULL; | |
592 | ||
593 | /* Disconnect dasd_devmap structure from ccw_device structure. */ | |
594 | cdev->dev.driver_data = NULL; | |
595 | ||
596 | /* Put ccw_device structure. */ | |
597 | put_device(&cdev->dev); | |
598 | ||
599 | /* Now the device structure can be freed. */ | |
600 | dasd_free_device(device); | |
601 | } | |
602 | ||
603 | /* | |
604 | * Reference counter dropped to zero. Wake up waiter | |
605 | * in dasd_delete_device. | |
606 | */ | |
607 | void | |
608 | dasd_put_device_wake(struct dasd_device *device) | |
609 | { | |
610 | wake_up(&dasd_delete_wq); | |
611 | } | |
612 | ||
613 | /* | |
614 | * Return dasd_device structure associated with cdev. | |
615 | */ | |
616 | struct dasd_device * | |
617 | dasd_device_from_cdev(struct ccw_device *cdev) | |
618 | { | |
619 | struct dasd_devmap *devmap; | |
620 | struct dasd_device *device; | |
621 | ||
622 | device = ERR_PTR(-ENODEV); | |
623 | spin_lock(&dasd_devmap_lock); | |
624 | devmap = cdev->dev.driver_data; | |
625 | if (devmap && devmap->device) { | |
626 | device = devmap->device; | |
627 | dasd_get_device(device); | |
628 | } | |
629 | spin_unlock(&dasd_devmap_lock); | |
630 | return device; | |
631 | } | |
632 | ||
633 | /* | |
634 | * SECTION: files in sysfs | |
635 | */ | |
636 | ||
637 | /* | |
638 | * readonly controls the readonly status of a dasd | |
639 | */ | |
640 | static ssize_t | |
e404e274 | 641 | dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
642 | { |
643 | struct dasd_devmap *devmap; | |
644 | int ro_flag; | |
645 | ||
646 | devmap = dasd_find_busid(dev->bus_id); | |
647 | if (!IS_ERR(devmap)) | |
648 | ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0; | |
649 | else | |
650 | ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0; | |
651 | return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); | |
652 | } | |
653 | ||
654 | static ssize_t | |
138c014d HH |
655 | dasd_ro_store(struct device *dev, struct device_attribute *attr, |
656 | const char *buf, size_t count) | |
1da177e4 LT |
657 | { |
658 | struct dasd_devmap *devmap; | |
659 | int ro_flag; | |
660 | ||
661 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
662 | if (IS_ERR(devmap)) | |
663 | return PTR_ERR(devmap); | |
664 | ro_flag = buf[0] == '1'; | |
665 | spin_lock(&dasd_devmap_lock); | |
666 | if (ro_flag) | |
667 | devmap->features |= DASD_FEATURE_READONLY; | |
668 | else | |
669 | devmap->features &= ~DASD_FEATURE_READONLY; | |
c6eb7b77 HH |
670 | if (devmap->device) |
671 | devmap->device->features = devmap->features; | |
f24acd45 HH |
672 | if (devmap->device && devmap->device->gdp) |
673 | set_disk_ro(devmap->device->gdp, ro_flag); | |
1da177e4 LT |
674 | spin_unlock(&dasd_devmap_lock); |
675 | return count; | |
676 | } | |
677 | ||
678 | static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); | |
679 | ||
680 | /* | |
681 | * use_diag controls whether the driver should use diag rather than ssch | |
682 | * to talk to the device | |
683 | */ | |
138c014d | 684 | static ssize_t |
e404e274 | 685 | dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
686 | { |
687 | struct dasd_devmap *devmap; | |
688 | int use_diag; | |
689 | ||
690 | devmap = dasd_find_busid(dev->bus_id); | |
691 | if (!IS_ERR(devmap)) | |
692 | use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; | |
693 | else | |
694 | use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; | |
695 | return sprintf(buf, use_diag ? "1\n" : "0\n"); | |
696 | } | |
697 | ||
698 | static ssize_t | |
138c014d HH |
699 | dasd_use_diag_store(struct device *dev, struct device_attribute *attr, |
700 | const char *buf, size_t count) | |
1da177e4 LT |
701 | { |
702 | struct dasd_devmap *devmap; | |
703 | ssize_t rc; | |
704 | int use_diag; | |
705 | ||
706 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
707 | if (IS_ERR(devmap)) | |
708 | return PTR_ERR(devmap); | |
709 | use_diag = buf[0] == '1'; | |
710 | spin_lock(&dasd_devmap_lock); | |
711 | /* Changing diag discipline flag is only allowed in offline state. */ | |
712 | rc = count; | |
713 | if (!devmap->device) { | |
714 | if (use_diag) | |
715 | devmap->features |= DASD_FEATURE_USEDIAG; | |
716 | else | |
717 | devmap->features &= ~DASD_FEATURE_USEDIAG; | |
718 | } else | |
719 | rc = -EPERM; | |
720 | spin_unlock(&dasd_devmap_lock); | |
721 | return rc; | |
722 | } | |
723 | ||
138c014d | 724 | static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); |
1da177e4 LT |
725 | |
726 | static ssize_t | |
138c014d HH |
727 | dasd_discipline_show(struct device *dev, struct device_attribute *attr, |
728 | char *buf) | |
1da177e4 LT |
729 | { |
730 | struct dasd_devmap *devmap; | |
731 | char *dname; | |
732 | ||
733 | spin_lock(&dasd_devmap_lock); | |
734 | dname = "none"; | |
735 | devmap = dev->driver_data; | |
736 | if (devmap && devmap->device && devmap->device->discipline) | |
737 | dname = devmap->device->discipline->name; | |
738 | spin_unlock(&dasd_devmap_lock); | |
739 | return snprintf(buf, PAGE_SIZE, "%s\n", dname); | |
740 | } | |
741 | ||
742 | static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); | |
743 | ||
3d052595 HH |
744 | static ssize_t |
745 | dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf) | |
746 | { | |
747 | struct dasd_devmap *devmap; | |
748 | int alias; | |
749 | ||
750 | devmap = dasd_find_busid(dev->bus_id); | |
751 | spin_lock(&dasd_devmap_lock); | |
752 | if (!IS_ERR(devmap)) | |
753 | alias = devmap->uid.alias; | |
754 | else | |
755 | alias = 0; | |
756 | spin_unlock(&dasd_devmap_lock); | |
757 | ||
758 | return sprintf(buf, alias ? "1\n" : "0\n"); | |
759 | } | |
760 | ||
761 | static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); | |
762 | ||
763 | static ssize_t | |
764 | dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf) | |
765 | { | |
766 | struct dasd_devmap *devmap; | |
767 | char *vendor; | |
768 | ||
769 | devmap = dasd_find_busid(dev->bus_id); | |
770 | spin_lock(&dasd_devmap_lock); | |
771 | if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) | |
772 | vendor = devmap->uid.vendor; | |
773 | else | |
774 | vendor = ""; | |
775 | spin_unlock(&dasd_devmap_lock); | |
776 | ||
777 | return snprintf(buf, PAGE_SIZE, "%s\n", vendor); | |
778 | } | |
779 | ||
780 | static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); | |
781 | ||
782 | #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ | |
783 | /* SSID */ 4 + 1 + /* unit addr */ 2 + 1) | |
784 | ||
785 | static ssize_t | |
786 | dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
787 | { | |
788 | struct dasd_devmap *devmap; | |
789 | char uid[UID_STRLEN]; | |
790 | ||
791 | devmap = dasd_find_busid(dev->bus_id); | |
792 | spin_lock(&dasd_devmap_lock); | |
793 | if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) | |
794 | snprintf(uid, sizeof(uid), "%s.%s.%04x.%02x", | |
795 | devmap->uid.vendor, devmap->uid.serial, | |
796 | devmap->uid.ssid, devmap->uid.unit_addr); | |
797 | else | |
798 | uid[0] = 0; | |
799 | spin_unlock(&dasd_devmap_lock); | |
800 | ||
801 | return snprintf(buf, PAGE_SIZE, "%s\n", uid); | |
802 | } | |
803 | ||
804 | static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); | |
805 | ||
20c64468 SW |
806 | /* |
807 | * extended error-reporting | |
808 | */ | |
809 | static ssize_t | |
810 | dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) | |
811 | { | |
812 | struct dasd_devmap *devmap; | |
813 | int eer_flag; | |
814 | ||
815 | devmap = dasd_find_busid(dev->bus_id); | |
816 | if (!IS_ERR(devmap) && devmap->device) | |
817 | eer_flag = dasd_eer_enabled(devmap->device); | |
818 | else | |
819 | eer_flag = 0; | |
820 | return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); | |
821 | } | |
822 | ||
823 | static ssize_t | |
824 | dasd_eer_store(struct device *dev, struct device_attribute *attr, | |
825 | const char *buf, size_t count) | |
826 | { | |
827 | struct dasd_devmap *devmap; | |
828 | int rc; | |
829 | ||
830 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
831 | if (IS_ERR(devmap)) | |
832 | return PTR_ERR(devmap); | |
833 | if (!devmap->device) | |
834 | return count; | |
835 | if (buf[0] == '1') { | |
836 | rc = dasd_eer_enable(devmap->device); | |
837 | if (rc) | |
838 | return rc; | |
839 | } else | |
840 | dasd_eer_disable(devmap->device); | |
841 | return count; | |
842 | } | |
843 | ||
844 | static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); | |
845 | ||
1da177e4 LT |
846 | static struct attribute * dasd_attrs[] = { |
847 | &dev_attr_readonly.attr, | |
848 | &dev_attr_discipline.attr, | |
3d052595 HH |
849 | &dev_attr_alias.attr, |
850 | &dev_attr_vendor.attr, | |
851 | &dev_attr_uid.attr, | |
1da177e4 | 852 | &dev_attr_use_diag.attr, |
20c64468 | 853 | &dev_attr_eer_enabled.attr, |
1da177e4 LT |
854 | NULL, |
855 | }; | |
856 | ||
857 | static struct attribute_group dasd_attr_group = { | |
858 | .attrs = dasd_attrs, | |
859 | }; | |
860 | ||
40545573 HH |
861 | /* |
862 | * Check if the related storage server is already contained in the | |
863 | * dasd_serverlist. If server is not contained, create new entry. | |
864 | * Return 0 if server was already in serverlist, | |
865 | * 1 if the server was added successfully | |
866 | * <0 in case of error. | |
867 | */ | |
868 | static int | |
869 | dasd_add_server(struct dasd_uid *uid) | |
870 | { | |
871 | struct dasd_servermap *new, *tmp; | |
872 | ||
873 | /* check if server is already contained */ | |
874 | list_for_each_entry(tmp, &dasd_serverlist, list) | |
875 | // normale cmp? | |
876 | if (strncmp(tmp->sid.vendor, uid->vendor, | |
877 | sizeof(tmp->sid.vendor)) == 0 | |
878 | && strncmp(tmp->sid.serial, uid->serial, | |
879 | sizeof(tmp->sid.serial)) == 0) | |
880 | return 0; | |
881 | ||
882 | new = (struct dasd_servermap *) | |
883 | kzalloc(sizeof(struct dasd_servermap), GFP_KERNEL); | |
884 | if (!new) | |
885 | return -ENOMEM; | |
886 | ||
887 | strncpy(new->sid.vendor, uid->vendor, sizeof(new->sid.vendor)); | |
888 | strncpy(new->sid.serial, uid->serial, sizeof(new->sid.serial)); | |
889 | list_add(&new->list, &dasd_serverlist); | |
890 | return 1; | |
891 | } | |
892 | ||
3d052595 HH |
893 | |
894 | /* | |
895 | * Return copy of the device unique identifier. | |
896 | */ | |
897 | int | |
898 | dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid) | |
899 | { | |
900 | struct dasd_devmap *devmap; | |
901 | ||
902 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
903 | if (IS_ERR(devmap)) | |
904 | return PTR_ERR(devmap); | |
905 | spin_lock(&dasd_devmap_lock); | |
906 | *uid = devmap->uid; | |
907 | spin_unlock(&dasd_devmap_lock); | |
908 | return 0; | |
909 | } | |
910 | ||
911 | /* | |
912 | * Register the given device unique identifier into devmap struct. | |
40545573 HH |
913 | * Return 0 if server was already in serverlist, |
914 | * 1 if the server was added successful | |
915 | * <0 in case of error. | |
3d052595 HH |
916 | */ |
917 | int | |
918 | dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid) | |
919 | { | |
920 | struct dasd_devmap *devmap; | |
40545573 | 921 | int rc; |
3d052595 HH |
922 | |
923 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
924 | if (IS_ERR(devmap)) | |
925 | return PTR_ERR(devmap); | |
926 | spin_lock(&dasd_devmap_lock); | |
927 | devmap->uid = *uid; | |
40545573 | 928 | rc = dasd_add_server(uid); |
3d052595 | 929 | spin_unlock(&dasd_devmap_lock); |
40545573 | 930 | return rc; |
3d052595 | 931 | } |
40545573 | 932 | EXPORT_SYMBOL_GPL(dasd_set_uid); |
3d052595 | 933 | |
f24acd45 HH |
934 | /* |
935 | * Return value of the specified feature. | |
936 | */ | |
937 | int | |
938 | dasd_get_feature(struct ccw_device *cdev, int feature) | |
939 | { | |
940 | struct dasd_devmap *devmap; | |
941 | ||
942 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
943 | if (IS_ERR(devmap)) | |
40545573 | 944 | return PTR_ERR(devmap); |
f24acd45 HH |
945 | |
946 | return ((devmap->features & feature) != 0); | |
947 | } | |
948 | ||
949 | /* | |
950 | * Set / reset given feature. | |
951 | * Flag indicates wether to set (!=0) or the reset (=0) the feature. | |
952 | */ | |
953 | int | |
954 | dasd_set_feature(struct ccw_device *cdev, int feature, int flag) | |
955 | { | |
956 | struct dasd_devmap *devmap; | |
957 | ||
958 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
959 | if (IS_ERR(devmap)) | |
40545573 | 960 | return PTR_ERR(devmap); |
f24acd45 HH |
961 | |
962 | spin_lock(&dasd_devmap_lock); | |
963 | if (flag) | |
964 | devmap->features |= feature; | |
965 | else | |
966 | devmap->features &= ~feature; | |
c6eb7b77 HH |
967 | if (devmap->device) |
968 | devmap->device->features = devmap->features; | |
f24acd45 HH |
969 | spin_unlock(&dasd_devmap_lock); |
970 | return 0; | |
971 | } | |
972 | ||
973 | ||
1da177e4 LT |
974 | int |
975 | dasd_add_sysfs_files(struct ccw_device *cdev) | |
976 | { | |
977 | return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group); | |
978 | } | |
979 | ||
980 | void | |
981 | dasd_remove_sysfs_files(struct ccw_device *cdev) | |
982 | { | |
983 | sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group); | |
984 | } | |
985 | ||
986 | ||
987 | int | |
988 | dasd_devmap_init(void) | |
989 | { | |
990 | int i; | |
991 | ||
992 | /* Initialize devmap structures. */ | |
993 | dasd_max_devindex = 0; | |
994 | for (i = 0; i < 256; i++) | |
995 | INIT_LIST_HEAD(&dasd_hashlists[i]); | |
1da177e4 | 996 | |
40545573 HH |
997 | /* Initialize servermap structure. */ |
998 | INIT_LIST_HEAD(&dasd_serverlist); | |
999 | return 0; | |
1da177e4 LT |
1000 | } |
1001 | ||
1002 | void | |
1003 | dasd_devmap_exit(void) | |
1004 | { | |
1005 | dasd_forget_ranges(); | |
1006 | } |