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Commit | Line | Data |
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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 | 50 | /* |
b18a60e7 PO |
51 | * dasd_server_ssid_map contains a globally unique storage server subsystem ID. |
52 | * dasd_server_ssid_list contains the list of all subsystem IDs accessed by | |
53 | * the DASD device driver. | |
40545573 | 54 | */ |
b18a60e7 | 55 | struct dasd_server_ssid_map { |
40545573 | 56 | struct list_head list; |
8e79a441 | 57 | struct system_id { |
40545573 HH |
58 | char vendor[4]; |
59 | char serial[15]; | |
8e79a441 | 60 | __u16 ssid; |
40545573 HH |
61 | } sid; |
62 | }; | |
63 | ||
b18a60e7 | 64 | static struct list_head dasd_server_ssid_list; |
40545573 | 65 | |
1da177e4 LT |
66 | /* |
67 | * Parameter parsing functions for dasd= parameter. The syntax is: | |
68 | * <devno> : (0x)?[0-9a-fA-F]+ | |
69 | * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ | |
70 | * <feature> : ro | |
71 | * <feature_list> : \(<feature>(:<feature>)*\) | |
72 | * <devno-range> : <devno>(-<devno>)?<feature_list>? | |
73 | * <busid-range> : <busid>(-<busid>)?<feature_list>? | |
74 | * <devices> : <devno-range>|<busid-range> | |
75 | * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod | |
76 | * | |
77 | * <dasd> : autodetect|probeonly|<devices>(,<devices>)* | |
78 | */ | |
79 | ||
80 | int dasd_probeonly = 0; /* is true, when probeonly mode is active */ | |
81 | int dasd_autodetect = 0; /* is true, when autodetection is active */ | |
40545573 HH |
82 | int dasd_nopav = 0; /* is true, when PAV is disabled */ |
83 | EXPORT_SYMBOL_GPL(dasd_nopav); | |
1da177e4 LT |
84 | |
85 | /* | |
86 | * char *dasd[] is intended to hold the ranges supplied by the dasd= statement | |
87 | * it is named 'dasd' to directly be filled by insmod with the comma separated | |
88 | * strings when running as a module. | |
89 | */ | |
90 | static char *dasd[256]; | |
8d3b33f6 RR |
91 | module_param_array(dasd, charp, NULL, 0); |
92 | ||
1da177e4 | 93 | /* |
d0710c7c | 94 | * Single spinlock to protect devmap and servermap structures and lists. |
1da177e4 LT |
95 | */ |
96 | static DEFINE_SPINLOCK(dasd_devmap_lock); | |
97 | ||
98 | /* | |
99 | * Hash lists for devmap structures. | |
100 | */ | |
101 | static struct list_head dasd_hashlists[256]; | |
102 | int dasd_max_devindex; | |
103 | ||
104 | static struct dasd_devmap *dasd_add_busid(char *, int); | |
105 | ||
106 | static inline int | |
107 | dasd_hash_busid(char *bus_id) | |
108 | { | |
109 | int hash, i; | |
110 | ||
111 | hash = 0; | |
112 | for (i = 0; (i < BUS_ID_SIZE) && *bus_id; i++, bus_id++) | |
113 | hash += *bus_id; | |
114 | return hash & 0xff; | |
115 | } | |
116 | ||
117 | #ifndef MODULE | |
118 | /* | |
119 | * The parameter parsing functions for builtin-drivers are called | |
120 | * before kmalloc works. Store the pointers to the parameters strings | |
121 | * into dasd[] for later processing. | |
122 | */ | |
123 | static int __init | |
124 | dasd_call_setup(char *str) | |
125 | { | |
126 | static int count = 0; | |
127 | ||
128 | if (count < 256) | |
129 | dasd[count++] = str; | |
130 | return 1; | |
131 | } | |
132 | ||
133 | __setup ("dasd=", dasd_call_setup); | |
134 | #endif /* #ifndef MODULE */ | |
135 | ||
136 | /* | |
137 | * Read a device busid/devno from a string. | |
138 | */ | |
139 | static inline int | |
140 | dasd_busid(char **str, int *id0, int *id1, int *devno) | |
141 | { | |
142 | int val, old_style; | |
138c014d | 143 | |
1da177e4 LT |
144 | /* check for leading '0x' */ |
145 | old_style = 0; | |
146 | if ((*str)[0] == '0' && (*str)[1] == 'x') { | |
147 | *str += 2; | |
148 | old_style = 1; | |
149 | } | |
150 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
151 | return -EINVAL; | |
152 | val = simple_strtoul(*str, str, 16); | |
153 | if (old_style || (*str)[0] != '.') { | |
154 | *id0 = *id1 = 0; | |
155 | if (val < 0 || val > 0xffff) | |
156 | return -EINVAL; | |
157 | *devno = val; | |
158 | return 0; | |
159 | } | |
160 | /* New style x.y.z busid */ | |
161 | if (val < 0 || val > 0xff) | |
162 | return -EINVAL; | |
163 | *id0 = val; | |
164 | (*str)++; | |
165 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
166 | return -EINVAL; | |
167 | val = simple_strtoul(*str, str, 16); | |
168 | if (val < 0 || val > 0xff || (*str)++[0] != '.') | |
169 | return -EINVAL; | |
170 | *id1 = val; | |
171 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
172 | return -EINVAL; | |
173 | val = simple_strtoul(*str, str, 16); | |
174 | if (val < 0 || val > 0xffff) | |
175 | return -EINVAL; | |
176 | *devno = val; | |
177 | return 0; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Read colon separated list of dasd features. Currently there is | |
182 | * only one: "ro" for read-only devices. The default feature set | |
183 | * is empty (value 0). | |
184 | */ | |
185 | static inline int | |
186 | dasd_feature_list(char *str, char **endp) | |
187 | { | |
188 | int features, len, rc; | |
189 | ||
190 | rc = 0; | |
191 | if (*str != '(') { | |
192 | *endp = str; | |
193 | return DASD_FEATURE_DEFAULT; | |
194 | } | |
195 | str++; | |
196 | features = 0; | |
197 | ||
198 | while (1) { | |
138c014d | 199 | for (len = 0; |
1da177e4 LT |
200 | str[len] && str[len] != ':' && str[len] != ')'; len++); |
201 | if (len == 2 && !strncmp(str, "ro", 2)) | |
202 | features |= DASD_FEATURE_READONLY; | |
203 | else if (len == 4 && !strncmp(str, "diag", 4)) | |
204 | features |= DASD_FEATURE_USEDIAG; | |
205 | else { | |
206 | MESSAGE(KERN_WARNING, | |
207 | "unsupported feature: %*s, " | |
208 | "ignoring setting", len, str); | |
209 | rc = -EINVAL; | |
210 | } | |
211 | str += len; | |
212 | if (*str != ':') | |
213 | break; | |
214 | str++; | |
215 | } | |
216 | if (*str != ')') { | |
217 | MESSAGE(KERN_WARNING, "%s", | |
218 | "missing ')' in dasd parameter string\n"); | |
219 | rc = -EINVAL; | |
220 | } else | |
221 | str++; | |
222 | *endp = str; | |
223 | if (rc != 0) | |
224 | return rc; | |
225 | return features; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Try to match the first element on the comma separated parse string | |
230 | * with one of the known keywords. If a keyword is found, take the approprate | |
231 | * action and return a pointer to the residual string. If the first element | |
232 | * could not be matched to any keyword then return an error code. | |
233 | */ | |
234 | static char * | |
235 | dasd_parse_keyword( char *parsestring ) { | |
236 | ||
237 | char *nextcomma, *residual_str; | |
238 | int length; | |
239 | ||
240 | nextcomma = strchr(parsestring,','); | |
241 | if (nextcomma) { | |
242 | length = nextcomma - parsestring; | |
243 | residual_str = nextcomma + 1; | |
244 | } else { | |
245 | length = strlen(parsestring); | |
246 | residual_str = parsestring + length; | |
247 | } | |
40545573 | 248 | if (strncmp("autodetect", parsestring, length) == 0) { |
1da177e4 LT |
249 | dasd_autodetect = 1; |
250 | MESSAGE (KERN_INFO, "%s", | |
251 | "turning to autodetection mode"); | |
252 | return residual_str; | |
253 | } | |
40545573 | 254 | if (strncmp("probeonly", parsestring, length) == 0) { |
1da177e4 LT |
255 | dasd_probeonly = 1; |
256 | MESSAGE(KERN_INFO, "%s", | |
257 | "turning to probeonly mode"); | |
258 | return residual_str; | |
259 | } | |
40545573 | 260 | if (strncmp("nopav", parsestring, length) == 0) { |
dcd707b4 PO |
261 | if (MACHINE_IS_VM) |
262 | MESSAGE(KERN_INFO, "%s", "'nopav' not supported on VM"); | |
263 | else { | |
264 | dasd_nopav = 1; | |
265 | MESSAGE(KERN_INFO, "%s", "disable PAV mode"); | |
266 | } | |
40545573 HH |
267 | return residual_str; |
268 | } | |
269 | if (strncmp("fixedbuffers", parsestring, length) == 0) { | |
1da177e4 LT |
270 | if (dasd_page_cache) |
271 | return residual_str; | |
272 | dasd_page_cache = | |
2f6c55fc HC |
273 | kmem_cache_create("dasd_page_cache", PAGE_SIZE, |
274 | PAGE_SIZE, SLAB_CACHE_DMA, | |
275 | NULL, NULL ); | |
1da177e4 LT |
276 | if (!dasd_page_cache) |
277 | MESSAGE(KERN_WARNING, "%s", "Failed to create slab, " | |
278 | "fixed buffer mode disabled."); | |
279 | else | |
280 | MESSAGE (KERN_INFO, "%s", | |
281 | "turning on fixed buffer mode"); | |
282 | return residual_str; | |
283 | } | |
284 | return ERR_PTR(-EINVAL); | |
285 | } | |
286 | ||
287 | /* | |
288 | * Try to interprete the first element on the comma separated parse string | |
289 | * as a device number or a range of devices. If the interpretation is | |
290 | * successfull, create the matching dasd_devmap entries and return a pointer | |
291 | * to the residual string. | |
292 | * If interpretation fails or in case of an error, return an error code. | |
293 | */ | |
294 | static char * | |
295 | dasd_parse_range( char *parsestring ) { | |
296 | ||
297 | struct dasd_devmap *devmap; | |
298 | int from, from_id0, from_id1; | |
299 | int to, to_id0, to_id1; | |
300 | int features, rc; | |
301 | char bus_id[BUS_ID_SIZE+1], *str; | |
302 | ||
303 | str = parsestring; | |
304 | rc = dasd_busid(&str, &from_id0, &from_id1, &from); | |
305 | if (rc == 0) { | |
306 | to = from; | |
307 | to_id0 = from_id0; | |
308 | to_id1 = from_id1; | |
309 | if (*str == '-') { | |
310 | str++; | |
311 | rc = dasd_busid(&str, &to_id0, &to_id1, &to); | |
312 | } | |
313 | } | |
314 | if (rc == 0 && | |
315 | (from_id0 != to_id0 || from_id1 != to_id1 || from > to)) | |
316 | rc = -EINVAL; | |
317 | if (rc) { | |
318 | MESSAGE(KERN_ERR, "Invalid device range %s", parsestring); | |
319 | return ERR_PTR(rc); | |
320 | } | |
321 | features = dasd_feature_list(str, &str); | |
322 | if (features < 0) | |
323 | return ERR_PTR(-EINVAL); | |
40545573 HH |
324 | /* each device in dasd= parameter should be set initially online */ |
325 | features |= DASD_FEATURE_INITIAL_ONLINE; | |
1da177e4 LT |
326 | while (from <= to) { |
327 | sprintf(bus_id, "%01x.%01x.%04x", | |
328 | from_id0, from_id1, from++); | |
329 | devmap = dasd_add_busid(bus_id, features); | |
330 | if (IS_ERR(devmap)) | |
331 | return (char *)devmap; | |
332 | } | |
333 | if (*str == ',') | |
334 | return str + 1; | |
335 | if (*str == '\0') | |
336 | return str; | |
337 | MESSAGE(KERN_WARNING, | |
338 | "junk at end of dasd parameter string: %s\n", str); | |
339 | return ERR_PTR(-EINVAL); | |
340 | } | |
341 | ||
342 | static inline char * | |
343 | dasd_parse_next_element( char *parsestring ) { | |
344 | char * residual_str; | |
345 | residual_str = dasd_parse_keyword(parsestring); | |
346 | if (!IS_ERR(residual_str)) | |
347 | return residual_str; | |
348 | residual_str = dasd_parse_range(parsestring); | |
349 | return residual_str; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Parse parameters stored in dasd[] | |
354 | * The 'dasd=...' parameter allows to specify a comma separated list of | |
355 | * keywords and device ranges. When the dasd driver is build into the kernel, | |
356 | * the complete list will be stored as one element of the dasd[] array. | |
357 | * When the dasd driver is build as a module, then the list is broken into | |
358 | * it's elements and each dasd[] entry contains one element. | |
359 | */ | |
360 | int | |
361 | dasd_parse(void) | |
362 | { | |
363 | int rc, i; | |
364 | char *parsestring; | |
365 | ||
366 | rc = 0; | |
367 | for (i = 0; i < 256; i++) { | |
368 | if (dasd[i] == NULL) | |
369 | break; | |
370 | parsestring = dasd[i]; | |
371 | /* loop over the comma separated list in the parsestring */ | |
372 | while (*parsestring) { | |
373 | parsestring = dasd_parse_next_element(parsestring); | |
374 | if(IS_ERR(parsestring)) { | |
375 | rc = PTR_ERR(parsestring); | |
376 | break; | |
377 | } | |
378 | } | |
379 | if (rc) { | |
380 | DBF_EVENT(DBF_ALERT, "%s", "invalid range found"); | |
381 | break; | |
382 | } | |
383 | } | |
384 | return rc; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Add a devmap for the device specified by busid. It is possible that | |
389 | * the devmap already exists (dasd= parameter). The order of the devices | |
390 | * added through this function will define the kdevs for the individual | |
138c014d | 391 | * devices. |
1da177e4 LT |
392 | */ |
393 | static struct dasd_devmap * | |
394 | dasd_add_busid(char *bus_id, int features) | |
395 | { | |
396 | struct dasd_devmap *devmap, *new, *tmp; | |
397 | int hash; | |
398 | ||
399 | new = (struct dasd_devmap *) | |
138c014d | 400 | kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); |
1da177e4 LT |
401 | if (!new) |
402 | return ERR_PTR(-ENOMEM); | |
403 | spin_lock(&dasd_devmap_lock); | |
d2c993d8 | 404 | devmap = NULL; |
1da177e4 LT |
405 | hash = dasd_hash_busid(bus_id); |
406 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) | |
407 | if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) { | |
408 | devmap = tmp; | |
409 | break; | |
410 | } | |
411 | if (!devmap) { | |
412 | /* This bus_id is new. */ | |
413 | new->devindex = dasd_max_devindex++; | |
414 | strncpy(new->bus_id, bus_id, BUS_ID_SIZE); | |
415 | new->features = features; | |
d2c993d8 | 416 | new->device = NULL; |
1da177e4 LT |
417 | list_add(&new->list, &dasd_hashlists[hash]); |
418 | devmap = new; | |
d2c993d8 | 419 | new = NULL; |
1da177e4 LT |
420 | } |
421 | spin_unlock(&dasd_devmap_lock); | |
17fd682e | 422 | kfree(new); |
1da177e4 LT |
423 | return devmap; |
424 | } | |
425 | ||
426 | /* | |
427 | * Find devmap for device with given bus_id. | |
428 | */ | |
429 | static struct dasd_devmap * | |
430 | dasd_find_busid(char *bus_id) | |
431 | { | |
432 | struct dasd_devmap *devmap, *tmp; | |
433 | int hash; | |
434 | ||
435 | spin_lock(&dasd_devmap_lock); | |
436 | devmap = ERR_PTR(-ENODEV); | |
437 | hash = dasd_hash_busid(bus_id); | |
438 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) { | |
439 | if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) { | |
440 | devmap = tmp; | |
441 | break; | |
442 | } | |
443 | } | |
444 | spin_unlock(&dasd_devmap_lock); | |
445 | return devmap; | |
446 | } | |
447 | ||
448 | /* | |
449 | * Check if busid has been added to the list of dasd ranges. | |
450 | */ | |
451 | int | |
452 | dasd_busid_known(char *bus_id) | |
453 | { | |
454 | return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; | |
455 | } | |
456 | ||
457 | /* | |
458 | * Forget all about the device numbers added so far. | |
459 | * This may only be called at module unload or system shutdown. | |
460 | */ | |
461 | static void | |
462 | dasd_forget_ranges(void) | |
463 | { | |
464 | struct dasd_devmap *devmap, *n; | |
465 | int i; | |
466 | ||
467 | spin_lock(&dasd_devmap_lock); | |
468 | for (i = 0; i < 256; i++) { | |
469 | list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { | |
606f4422 | 470 | BUG_ON(devmap->device != NULL); |
1da177e4 LT |
471 | list_del(&devmap->list); |
472 | kfree(devmap); | |
473 | } | |
474 | } | |
475 | spin_unlock(&dasd_devmap_lock); | |
476 | } | |
477 | ||
478 | /* | |
479 | * Find the device struct by its device index. | |
480 | */ | |
481 | struct dasd_device * | |
482 | dasd_device_from_devindex(int devindex) | |
483 | { | |
484 | struct dasd_devmap *devmap, *tmp; | |
485 | struct dasd_device *device; | |
486 | int i; | |
487 | ||
488 | spin_lock(&dasd_devmap_lock); | |
d2c993d8 | 489 | devmap = NULL; |
1da177e4 LT |
490 | for (i = 0; (i < 256) && !devmap; i++) |
491 | list_for_each_entry(tmp, &dasd_hashlists[i], list) | |
492 | if (tmp->devindex == devindex) { | |
493 | /* Found the devmap for the device. */ | |
494 | devmap = tmp; | |
495 | break; | |
496 | } | |
497 | if (devmap && devmap->device) { | |
498 | device = devmap->device; | |
499 | dasd_get_device(device); | |
500 | } else | |
501 | device = ERR_PTR(-ENODEV); | |
502 | spin_unlock(&dasd_devmap_lock); | |
503 | return device; | |
504 | } | |
505 | ||
506 | /* | |
507 | * Return devmap for cdev. If no devmap exists yet, create one and | |
508 | * connect it to the cdev. | |
509 | */ | |
510 | static struct dasd_devmap * | |
511 | dasd_devmap_from_cdev(struct ccw_device *cdev) | |
512 | { | |
513 | struct dasd_devmap *devmap; | |
514 | ||
515 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
516 | if (IS_ERR(devmap)) | |
517 | devmap = dasd_add_busid(cdev->dev.bus_id, | |
518 | DASD_FEATURE_DEFAULT); | |
519 | return devmap; | |
520 | } | |
521 | ||
522 | /* | |
523 | * Create a dasd device structure for cdev. | |
524 | */ | |
525 | struct dasd_device * | |
526 | dasd_create_device(struct ccw_device *cdev) | |
527 | { | |
528 | struct dasd_devmap *devmap; | |
529 | struct dasd_device *device; | |
a00bfd71 | 530 | unsigned long flags; |
1da177e4 LT |
531 | int rc; |
532 | ||
533 | devmap = dasd_devmap_from_cdev(cdev); | |
534 | if (IS_ERR(devmap)) | |
535 | return (void *) devmap; | |
1da177e4 LT |
536 | |
537 | device = dasd_alloc_device(); | |
538 | if (IS_ERR(device)) | |
539 | return device; | |
a00bfd71 | 540 | atomic_set(&device->ref_count, 3); |
1da177e4 LT |
541 | |
542 | spin_lock(&dasd_devmap_lock); | |
543 | if (!devmap->device) { | |
544 | devmap->device = device; | |
545 | device->devindex = devmap->devindex; | |
c6eb7b77 | 546 | device->features = devmap->features; |
1da177e4 LT |
547 | get_device(&cdev->dev); |
548 | device->cdev = cdev; | |
549 | rc = 0; | |
550 | } else | |
551 | /* Someone else was faster. */ | |
552 | rc = -EBUSY; | |
553 | spin_unlock(&dasd_devmap_lock); | |
554 | ||
555 | if (rc) { | |
556 | dasd_free_device(device); | |
557 | return ERR_PTR(rc); | |
558 | } | |
a00bfd71 MS |
559 | |
560 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
561 | cdev->dev.driver_data = device; | |
562 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
563 | ||
1da177e4 LT |
564 | return device; |
565 | } | |
566 | ||
567 | /* | |
568 | * Wait queue for dasd_delete_device waits. | |
569 | */ | |
570 | static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); | |
571 | ||
572 | /* | |
573 | * Remove a dasd device structure. The passed referenced | |
574 | * is destroyed. | |
575 | */ | |
576 | void | |
577 | dasd_delete_device(struct dasd_device *device) | |
578 | { | |
579 | struct ccw_device *cdev; | |
580 | struct dasd_devmap *devmap; | |
a00bfd71 | 581 | unsigned long flags; |
1da177e4 LT |
582 | |
583 | /* First remove device pointer from devmap. */ | |
584 | devmap = dasd_find_busid(device->cdev->dev.bus_id); | |
606f4422 | 585 | BUG_ON(IS_ERR(devmap)); |
1da177e4 LT |
586 | spin_lock(&dasd_devmap_lock); |
587 | if (devmap->device != device) { | |
588 | spin_unlock(&dasd_devmap_lock); | |
589 | dasd_put_device(device); | |
590 | return; | |
591 | } | |
592 | devmap->device = NULL; | |
593 | spin_unlock(&dasd_devmap_lock); | |
594 | ||
a00bfd71 MS |
595 | /* Disconnect dasd_device structure from ccw_device structure. */ |
596 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
597 | device->cdev->dev.driver_data = NULL; | |
598 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
599 | ||
600 | /* | |
601 | * Drop ref_count by 3, one for the devmap reference, one for | |
602 | * the cdev reference and one for the passed reference. | |
603 | */ | |
604 | atomic_sub(3, &device->ref_count); | |
1da177e4 LT |
605 | |
606 | /* Wait for reference counter to drop to zero. */ | |
607 | wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); | |
608 | ||
609 | /* Disconnect dasd_device structure from ccw_device structure. */ | |
610 | cdev = device->cdev; | |
611 | device->cdev = NULL; | |
612 | ||
1da177e4 LT |
613 | /* Put ccw_device structure. */ |
614 | put_device(&cdev->dev); | |
615 | ||
616 | /* Now the device structure can be freed. */ | |
617 | dasd_free_device(device); | |
618 | } | |
619 | ||
620 | /* | |
621 | * Reference counter dropped to zero. Wake up waiter | |
622 | * in dasd_delete_device. | |
623 | */ | |
624 | void | |
625 | dasd_put_device_wake(struct dasd_device *device) | |
626 | { | |
627 | wake_up(&dasd_delete_wq); | |
628 | } | |
629 | ||
a00bfd71 MS |
630 | /* |
631 | * Return dasd_device structure associated with cdev. | |
632 | * This function needs to be called with the ccw device | |
633 | * lock held. It can be used from interrupt context. | |
634 | */ | |
635 | struct dasd_device * | |
636 | dasd_device_from_cdev_locked(struct ccw_device *cdev) | |
637 | { | |
638 | struct dasd_device *device = cdev->dev.driver_data; | |
639 | ||
640 | if (!device) | |
641 | return ERR_PTR(-ENODEV); | |
642 | dasd_get_device(device); | |
643 | return device; | |
644 | } | |
645 | ||
1da177e4 LT |
646 | /* |
647 | * Return dasd_device structure associated with cdev. | |
648 | */ | |
649 | struct dasd_device * | |
650 | dasd_device_from_cdev(struct ccw_device *cdev) | |
651 | { | |
1da177e4 | 652 | struct dasd_device *device; |
a00bfd71 | 653 | unsigned long flags; |
1da177e4 | 654 | |
a00bfd71 MS |
655 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
656 | device = dasd_device_from_cdev_locked(cdev); | |
657 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1da177e4 LT |
658 | return device; |
659 | } | |
660 | ||
661 | /* | |
662 | * SECTION: files in sysfs | |
663 | */ | |
664 | ||
665 | /* | |
666 | * readonly controls the readonly status of a dasd | |
667 | */ | |
668 | static ssize_t | |
e404e274 | 669 | dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
670 | { |
671 | struct dasd_devmap *devmap; | |
672 | int ro_flag; | |
673 | ||
674 | devmap = dasd_find_busid(dev->bus_id); | |
675 | if (!IS_ERR(devmap)) | |
676 | ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0; | |
677 | else | |
678 | ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0; | |
679 | return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); | |
680 | } | |
681 | ||
682 | static ssize_t | |
138c014d HH |
683 | dasd_ro_store(struct device *dev, struct device_attribute *attr, |
684 | const char *buf, size_t count) | |
1da177e4 LT |
685 | { |
686 | struct dasd_devmap *devmap; | |
687 | int ro_flag; | |
688 | ||
689 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
690 | if (IS_ERR(devmap)) | |
691 | return PTR_ERR(devmap); | |
692 | ro_flag = buf[0] == '1'; | |
693 | spin_lock(&dasd_devmap_lock); | |
694 | if (ro_flag) | |
695 | devmap->features |= DASD_FEATURE_READONLY; | |
696 | else | |
697 | devmap->features &= ~DASD_FEATURE_READONLY; | |
c6eb7b77 HH |
698 | if (devmap->device) |
699 | devmap->device->features = devmap->features; | |
f24acd45 HH |
700 | if (devmap->device && devmap->device->gdp) |
701 | set_disk_ro(devmap->device->gdp, ro_flag); | |
1da177e4 LT |
702 | spin_unlock(&dasd_devmap_lock); |
703 | return count; | |
704 | } | |
705 | ||
706 | static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); | |
707 | ||
708 | /* | |
709 | * use_diag controls whether the driver should use diag rather than ssch | |
710 | * to talk to the device | |
711 | */ | |
138c014d | 712 | static ssize_t |
e404e274 | 713 | dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
714 | { |
715 | struct dasd_devmap *devmap; | |
716 | int use_diag; | |
717 | ||
718 | devmap = dasd_find_busid(dev->bus_id); | |
719 | if (!IS_ERR(devmap)) | |
720 | use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; | |
721 | else | |
722 | use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; | |
723 | return sprintf(buf, use_diag ? "1\n" : "0\n"); | |
724 | } | |
725 | ||
726 | static ssize_t | |
138c014d HH |
727 | dasd_use_diag_store(struct device *dev, struct device_attribute *attr, |
728 | const char *buf, size_t count) | |
1da177e4 LT |
729 | { |
730 | struct dasd_devmap *devmap; | |
731 | ssize_t rc; | |
732 | int use_diag; | |
733 | ||
734 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
735 | if (IS_ERR(devmap)) | |
736 | return PTR_ERR(devmap); | |
737 | use_diag = buf[0] == '1'; | |
738 | spin_lock(&dasd_devmap_lock); | |
739 | /* Changing diag discipline flag is only allowed in offline state. */ | |
740 | rc = count; | |
741 | if (!devmap->device) { | |
742 | if (use_diag) | |
743 | devmap->features |= DASD_FEATURE_USEDIAG; | |
744 | else | |
745 | devmap->features &= ~DASD_FEATURE_USEDIAG; | |
746 | } else | |
747 | rc = -EPERM; | |
748 | spin_unlock(&dasd_devmap_lock); | |
749 | return rc; | |
750 | } | |
751 | ||
138c014d | 752 | static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); |
1da177e4 LT |
753 | |
754 | static ssize_t | |
138c014d HH |
755 | dasd_discipline_show(struct device *dev, struct device_attribute *attr, |
756 | char *buf) | |
1da177e4 | 757 | { |
a00bfd71 MS |
758 | struct dasd_device *device; |
759 | ssize_t len; | |
1da177e4 | 760 | |
a00bfd71 MS |
761 | device = dasd_device_from_cdev(to_ccwdev(dev)); |
762 | if (!IS_ERR(device) && device->discipline) { | |
763 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
764 | device->discipline->name); | |
765 | dasd_put_device(device); | |
766 | } else | |
767 | len = snprintf(buf, PAGE_SIZE, "none\n"); | |
768 | return len; | |
1da177e4 LT |
769 | } |
770 | ||
771 | static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); | |
772 | ||
3d052595 HH |
773 | static ssize_t |
774 | dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf) | |
775 | { | |
776 | struct dasd_devmap *devmap; | |
777 | int alias; | |
778 | ||
779 | devmap = dasd_find_busid(dev->bus_id); | |
780 | spin_lock(&dasd_devmap_lock); | |
781 | if (!IS_ERR(devmap)) | |
782 | alias = devmap->uid.alias; | |
783 | else | |
784 | alias = 0; | |
785 | spin_unlock(&dasd_devmap_lock); | |
786 | ||
787 | return sprintf(buf, alias ? "1\n" : "0\n"); | |
788 | } | |
789 | ||
790 | static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); | |
791 | ||
792 | static ssize_t | |
793 | dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf) | |
794 | { | |
795 | struct dasd_devmap *devmap; | |
796 | char *vendor; | |
797 | ||
798 | devmap = dasd_find_busid(dev->bus_id); | |
799 | spin_lock(&dasd_devmap_lock); | |
800 | if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) | |
801 | vendor = devmap->uid.vendor; | |
802 | else | |
803 | vendor = ""; | |
804 | spin_unlock(&dasd_devmap_lock); | |
805 | ||
806 | return snprintf(buf, PAGE_SIZE, "%s\n", vendor); | |
807 | } | |
808 | ||
809 | static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); | |
810 | ||
811 | #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ | |
812 | /* SSID */ 4 + 1 + /* unit addr */ 2 + 1) | |
813 | ||
814 | static ssize_t | |
815 | dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
816 | { | |
817 | struct dasd_devmap *devmap; | |
818 | char uid[UID_STRLEN]; | |
819 | ||
820 | devmap = dasd_find_busid(dev->bus_id); | |
821 | spin_lock(&dasd_devmap_lock); | |
822 | if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) | |
823 | snprintf(uid, sizeof(uid), "%s.%s.%04x.%02x", | |
824 | devmap->uid.vendor, devmap->uid.serial, | |
825 | devmap->uid.ssid, devmap->uid.unit_addr); | |
826 | else | |
827 | uid[0] = 0; | |
828 | spin_unlock(&dasd_devmap_lock); | |
829 | ||
830 | return snprintf(buf, PAGE_SIZE, "%s\n", uid); | |
831 | } | |
832 | ||
833 | static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); | |
834 | ||
20c64468 SW |
835 | /* |
836 | * extended error-reporting | |
837 | */ | |
838 | static ssize_t | |
839 | dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) | |
840 | { | |
841 | struct dasd_devmap *devmap; | |
842 | int eer_flag; | |
843 | ||
844 | devmap = dasd_find_busid(dev->bus_id); | |
845 | if (!IS_ERR(devmap) && devmap->device) | |
846 | eer_flag = dasd_eer_enabled(devmap->device); | |
847 | else | |
848 | eer_flag = 0; | |
849 | return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); | |
850 | } | |
851 | ||
852 | static ssize_t | |
853 | dasd_eer_store(struct device *dev, struct device_attribute *attr, | |
854 | const char *buf, size_t count) | |
855 | { | |
856 | struct dasd_devmap *devmap; | |
857 | int rc; | |
858 | ||
859 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
860 | if (IS_ERR(devmap)) | |
861 | return PTR_ERR(devmap); | |
862 | if (!devmap->device) | |
863 | return count; | |
864 | if (buf[0] == '1') { | |
865 | rc = dasd_eer_enable(devmap->device); | |
866 | if (rc) | |
867 | return rc; | |
868 | } else | |
869 | dasd_eer_disable(devmap->device); | |
870 | return count; | |
871 | } | |
872 | ||
873 | static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); | |
874 | ||
1da177e4 LT |
875 | static struct attribute * dasd_attrs[] = { |
876 | &dev_attr_readonly.attr, | |
877 | &dev_attr_discipline.attr, | |
3d052595 HH |
878 | &dev_attr_alias.attr, |
879 | &dev_attr_vendor.attr, | |
880 | &dev_attr_uid.attr, | |
1da177e4 | 881 | &dev_attr_use_diag.attr, |
20c64468 | 882 | &dev_attr_eer_enabled.attr, |
1da177e4 LT |
883 | NULL, |
884 | }; | |
885 | ||
886 | static struct attribute_group dasd_attr_group = { | |
887 | .attrs = dasd_attrs, | |
888 | }; | |
889 | ||
3d052595 HH |
890 | /* |
891 | * Return copy of the device unique identifier. | |
892 | */ | |
893 | int | |
894 | dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid) | |
895 | { | |
896 | struct dasd_devmap *devmap; | |
897 | ||
898 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
899 | if (IS_ERR(devmap)) | |
900 | return PTR_ERR(devmap); | |
901 | spin_lock(&dasd_devmap_lock); | |
902 | *uid = devmap->uid; | |
903 | spin_unlock(&dasd_devmap_lock); | |
904 | return 0; | |
905 | } | |
906 | ||
907 | /* | |
908 | * Register the given device unique identifier into devmap struct. | |
b18a60e7 PO |
909 | * In addition check if the related storage server subsystem ID is already |
910 | * contained in the dasd_server_ssid_list. If subsystem ID is not contained, | |
911 | * create new entry. | |
40545573 HH |
912 | * Return 0 if server was already in serverlist, |
913 | * 1 if the server was added successful | |
914 | * <0 in case of error. | |
3d052595 HH |
915 | */ |
916 | int | |
917 | dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid) | |
918 | { | |
919 | struct dasd_devmap *devmap; | |
b18a60e7 | 920 | struct dasd_server_ssid_map *srv, *tmp; |
3d052595 HH |
921 | |
922 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
923 | if (IS_ERR(devmap)) | |
924 | return PTR_ERR(devmap); | |
d0710c7c | 925 | |
b18a60e7 PO |
926 | /* generate entry for server_ssid_map */ |
927 | srv = (struct dasd_server_ssid_map *) | |
928 | kzalloc(sizeof(struct dasd_server_ssid_map), GFP_KERNEL); | |
d0710c7c HH |
929 | if (!srv) |
930 | return -ENOMEM; | |
931 | strncpy(srv->sid.vendor, uid->vendor, sizeof(srv->sid.vendor) - 1); | |
932 | strncpy(srv->sid.serial, uid->serial, sizeof(srv->sid.serial) - 1); | |
8e79a441 | 933 | srv->sid.ssid = uid->ssid; |
d0710c7c HH |
934 | |
935 | /* server is already contained ? */ | |
3d052595 HH |
936 | spin_lock(&dasd_devmap_lock); |
937 | devmap->uid = *uid; | |
b18a60e7 | 938 | list_for_each_entry(tmp, &dasd_server_ssid_list, list) { |
d0710c7c | 939 | if (!memcmp(&srv->sid, &tmp->sid, |
8e79a441 | 940 | sizeof(struct system_id))) { |
d0710c7c HH |
941 | kfree(srv); |
942 | srv = NULL; | |
943 | break; | |
944 | } | |
945 | } | |
946 | ||
947 | /* add servermap to serverlist */ | |
948 | if (srv) | |
b18a60e7 | 949 | list_add(&srv->list, &dasd_server_ssid_list); |
3d052595 | 950 | spin_unlock(&dasd_devmap_lock); |
d0710c7c HH |
951 | |
952 | return (srv ? 1 : 0); | |
3d052595 | 953 | } |
40545573 | 954 | EXPORT_SYMBOL_GPL(dasd_set_uid); |
3d052595 | 955 | |
f24acd45 HH |
956 | /* |
957 | * Return value of the specified feature. | |
958 | */ | |
959 | int | |
960 | dasd_get_feature(struct ccw_device *cdev, int feature) | |
961 | { | |
962 | struct dasd_devmap *devmap; | |
963 | ||
964 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
965 | if (IS_ERR(devmap)) | |
40545573 | 966 | return PTR_ERR(devmap); |
f24acd45 HH |
967 | |
968 | return ((devmap->features & feature) != 0); | |
969 | } | |
970 | ||
971 | /* | |
972 | * Set / reset given feature. | |
973 | * Flag indicates wether to set (!=0) or the reset (=0) the feature. | |
974 | */ | |
975 | int | |
976 | dasd_set_feature(struct ccw_device *cdev, int feature, int flag) | |
977 | { | |
978 | struct dasd_devmap *devmap; | |
979 | ||
980 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
981 | if (IS_ERR(devmap)) | |
40545573 | 982 | return PTR_ERR(devmap); |
f24acd45 HH |
983 | |
984 | spin_lock(&dasd_devmap_lock); | |
985 | if (flag) | |
986 | devmap->features |= feature; | |
987 | else | |
988 | devmap->features &= ~feature; | |
c6eb7b77 HH |
989 | if (devmap->device) |
990 | devmap->device->features = devmap->features; | |
f24acd45 HH |
991 | spin_unlock(&dasd_devmap_lock); |
992 | return 0; | |
993 | } | |
994 | ||
995 | ||
1da177e4 LT |
996 | int |
997 | dasd_add_sysfs_files(struct ccw_device *cdev) | |
998 | { | |
999 | return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group); | |
1000 | } | |
1001 | ||
1002 | void | |
1003 | dasd_remove_sysfs_files(struct ccw_device *cdev) | |
1004 | { | |
1005 | sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group); | |
1006 | } | |
1007 | ||
1008 | ||
1009 | int | |
1010 | dasd_devmap_init(void) | |
1011 | { | |
1012 | int i; | |
1013 | ||
1014 | /* Initialize devmap structures. */ | |
1015 | dasd_max_devindex = 0; | |
1016 | for (i = 0; i < 256; i++) | |
1017 | INIT_LIST_HEAD(&dasd_hashlists[i]); | |
1da177e4 | 1018 | |
40545573 | 1019 | /* Initialize servermap structure. */ |
b18a60e7 | 1020 | INIT_LIST_HEAD(&dasd_server_ssid_list); |
40545573 | 1021 | return 0; |
1da177e4 LT |
1022 | } |
1023 | ||
1024 | void | |
1025 | dasd_devmap_exit(void) | |
1026 | { | |
1027 | dasd_forget_ranges(); | |
1028 | } |