Commit | Line | Data |
---|---|---|
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> | |
7039d3a1 | 22 | #include <asm/ipl.h> |
1da177e4 LT |
23 | |
24 | /* This is ugly... */ | |
25 | #define PRINTK_HEADER "dasd_devmap:" | |
26 | ||
27 | #include "dasd_int.h" | |
28 | ||
e18b890b | 29 | struct kmem_cache *dasd_page_cache; |
40545573 | 30 | EXPORT_SYMBOL_GPL(dasd_page_cache); |
1da177e4 LT |
31 | |
32 | /* | |
33 | * dasd_devmap_t is used to store the features and the relation | |
34 | * between device number and device index. To find a dasd_devmap_t | |
35 | * that corresponds to a device number of a device index each | |
36 | * dasd_devmap_t is added to two linked lists, one to search by | |
37 | * the device number and one to search by the device index. As | |
38 | * soon as big minor numbers are available the device index list | |
39 | * can be removed since the device number will then be identical | |
40 | * to the device index. | |
41 | */ | |
42 | struct dasd_devmap { | |
43 | struct list_head list; | |
44 | char bus_id[BUS_ID_SIZE]; | |
45 | unsigned int devindex; | |
46 | unsigned short features; | |
47 | struct dasd_device *device; | |
3d052595 | 48 | struct dasd_uid uid; |
1da177e4 LT |
49 | }; |
50 | ||
40545573 | 51 | /* |
b18a60e7 PO |
52 | * dasd_server_ssid_map contains a globally unique storage server subsystem ID. |
53 | * dasd_server_ssid_list contains the list of all subsystem IDs accessed by | |
54 | * the DASD device driver. | |
40545573 | 55 | */ |
b18a60e7 | 56 | struct dasd_server_ssid_map { |
40545573 | 57 | struct list_head list; |
8e79a441 | 58 | struct system_id { |
40545573 HH |
59 | char vendor[4]; |
60 | char serial[15]; | |
8e79a441 | 61 | __u16 ssid; |
40545573 HH |
62 | } sid; |
63 | }; | |
64 | ||
b18a60e7 | 65 | static struct list_head dasd_server_ssid_list; |
40545573 | 66 | |
1da177e4 LT |
67 | /* |
68 | * Parameter parsing functions for dasd= parameter. The syntax is: | |
69 | * <devno> : (0x)?[0-9a-fA-F]+ | |
70 | * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ | |
71 | * <feature> : ro | |
72 | * <feature_list> : \(<feature>(:<feature>)*\) | |
73 | * <devno-range> : <devno>(-<devno>)?<feature_list>? | |
74 | * <busid-range> : <busid>(-<busid>)?<feature_list>? | |
75 | * <devices> : <devno-range>|<busid-range> | |
76 | * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod | |
77 | * | |
78 | * <dasd> : autodetect|probeonly|<devices>(,<devices>)* | |
79 | */ | |
80 | ||
81 | int dasd_probeonly = 0; /* is true, when probeonly mode is active */ | |
82 | int dasd_autodetect = 0; /* is true, when autodetection is active */ | |
40545573 HH |
83 | int dasd_nopav = 0; /* is true, when PAV is disabled */ |
84 | EXPORT_SYMBOL_GPL(dasd_nopav); | |
1da177e4 LT |
85 | |
86 | /* | |
87 | * char *dasd[] is intended to hold the ranges supplied by the dasd= statement | |
88 | * it is named 'dasd' to directly be filled by insmod with the comma separated | |
89 | * strings when running as a module. | |
90 | */ | |
91 | static char *dasd[256]; | |
8d3b33f6 RR |
92 | module_param_array(dasd, charp, NULL, 0); |
93 | ||
1da177e4 | 94 | /* |
d0710c7c | 95 | * Single spinlock to protect devmap and servermap structures and lists. |
1da177e4 LT |
96 | */ |
97 | static DEFINE_SPINLOCK(dasd_devmap_lock); | |
98 | ||
99 | /* | |
100 | * Hash lists for devmap structures. | |
101 | */ | |
102 | static struct list_head dasd_hashlists[256]; | |
103 | int dasd_max_devindex; | |
104 | ||
105 | static struct dasd_devmap *dasd_add_busid(char *, int); | |
106 | ||
107 | static inline int | |
108 | dasd_hash_busid(char *bus_id) | |
109 | { | |
110 | int hash, i; | |
111 | ||
112 | hash = 0; | |
113 | for (i = 0; (i < BUS_ID_SIZE) && *bus_id; i++, bus_id++) | |
114 | hash += *bus_id; | |
115 | return hash & 0xff; | |
116 | } | |
117 | ||
118 | #ifndef MODULE | |
119 | /* | |
120 | * The parameter parsing functions for builtin-drivers are called | |
121 | * before kmalloc works. Store the pointers to the parameters strings | |
122 | * into dasd[] for later processing. | |
123 | */ | |
124 | static int __init | |
125 | dasd_call_setup(char *str) | |
126 | { | |
127 | static int count = 0; | |
128 | ||
129 | if (count < 256) | |
130 | dasd[count++] = str; | |
131 | return 1; | |
132 | } | |
133 | ||
134 | __setup ("dasd=", dasd_call_setup); | |
135 | #endif /* #ifndef MODULE */ | |
136 | ||
7039d3a1 PO |
137 | #define DASD_IPLDEV "ipldev" |
138 | ||
1da177e4 LT |
139 | /* |
140 | * Read a device busid/devno from a string. | |
141 | */ | |
4d284cac | 142 | static int |
1da177e4 LT |
143 | dasd_busid(char **str, int *id0, int *id1, int *devno) |
144 | { | |
145 | int val, old_style; | |
138c014d | 146 | |
7039d3a1 PO |
147 | /* Interpret ipldev busid */ |
148 | if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) { | |
149 | if (ipl_info.type != IPL_TYPE_CCW) { | |
150 | MESSAGE(KERN_ERR, "%s", "ipl device is not a ccw " | |
151 | "device"); | |
152 | return -EINVAL; | |
153 | } | |
154 | *id0 = 0; | |
155 | *id1 = ipl_info.data.ccw.dev_id.ssid; | |
156 | *devno = ipl_info.data.ccw.dev_id.devno; | |
157 | *str += strlen(DASD_IPLDEV); | |
158 | ||
159 | return 0; | |
160 | } | |
1da177e4 LT |
161 | /* check for leading '0x' */ |
162 | old_style = 0; | |
163 | if ((*str)[0] == '0' && (*str)[1] == 'x') { | |
164 | *str += 2; | |
165 | old_style = 1; | |
166 | } | |
167 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
168 | return -EINVAL; | |
169 | val = simple_strtoul(*str, str, 16); | |
170 | if (old_style || (*str)[0] != '.') { | |
171 | *id0 = *id1 = 0; | |
172 | if (val < 0 || val > 0xffff) | |
173 | return -EINVAL; | |
174 | *devno = val; | |
175 | return 0; | |
176 | } | |
177 | /* New style x.y.z busid */ | |
178 | if (val < 0 || val > 0xff) | |
179 | return -EINVAL; | |
180 | *id0 = val; | |
181 | (*str)++; | |
182 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
183 | return -EINVAL; | |
184 | val = simple_strtoul(*str, str, 16); | |
185 | if (val < 0 || val > 0xff || (*str)++[0] != '.') | |
186 | return -EINVAL; | |
187 | *id1 = val; | |
188 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
189 | return -EINVAL; | |
190 | val = simple_strtoul(*str, str, 16); | |
191 | if (val < 0 || val > 0xffff) | |
192 | return -EINVAL; | |
193 | *devno = val; | |
194 | return 0; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Read colon separated list of dasd features. Currently there is | |
199 | * only one: "ro" for read-only devices. The default feature set | |
200 | * is empty (value 0). | |
201 | */ | |
4d284cac | 202 | static int |
1da177e4 LT |
203 | dasd_feature_list(char *str, char **endp) |
204 | { | |
205 | int features, len, rc; | |
206 | ||
207 | rc = 0; | |
208 | if (*str != '(') { | |
209 | *endp = str; | |
210 | return DASD_FEATURE_DEFAULT; | |
211 | } | |
212 | str++; | |
213 | features = 0; | |
214 | ||
215 | while (1) { | |
138c014d | 216 | for (len = 0; |
1da177e4 LT |
217 | str[len] && str[len] != ':' && str[len] != ')'; len++); |
218 | if (len == 2 && !strncmp(str, "ro", 2)) | |
219 | features |= DASD_FEATURE_READONLY; | |
220 | else if (len == 4 && !strncmp(str, "diag", 4)) | |
221 | features |= DASD_FEATURE_USEDIAG; | |
9575bf26 HH |
222 | else if (len == 6 && !strncmp(str, "erplog", 6)) |
223 | features |= DASD_FEATURE_ERPLOG; | |
1da177e4 LT |
224 | else { |
225 | MESSAGE(KERN_WARNING, | |
226 | "unsupported feature: %*s, " | |
227 | "ignoring setting", len, str); | |
228 | rc = -EINVAL; | |
229 | } | |
230 | str += len; | |
231 | if (*str != ':') | |
232 | break; | |
233 | str++; | |
234 | } | |
235 | if (*str != ')') { | |
236 | MESSAGE(KERN_WARNING, "%s", | |
237 | "missing ')' in dasd parameter string\n"); | |
238 | rc = -EINVAL; | |
239 | } else | |
240 | str++; | |
241 | *endp = str; | |
242 | if (rc != 0) | |
243 | return rc; | |
244 | return features; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Try to match the first element on the comma separated parse string | |
249 | * with one of the known keywords. If a keyword is found, take the approprate | |
250 | * action and return a pointer to the residual string. If the first element | |
251 | * could not be matched to any keyword then return an error code. | |
252 | */ | |
253 | static char * | |
254 | dasd_parse_keyword( char *parsestring ) { | |
255 | ||
256 | char *nextcomma, *residual_str; | |
257 | int length; | |
258 | ||
259 | nextcomma = strchr(parsestring,','); | |
260 | if (nextcomma) { | |
261 | length = nextcomma - parsestring; | |
262 | residual_str = nextcomma + 1; | |
263 | } else { | |
264 | length = strlen(parsestring); | |
265 | residual_str = parsestring + length; | |
266 | } | |
40545573 | 267 | if (strncmp("autodetect", parsestring, length) == 0) { |
1da177e4 LT |
268 | dasd_autodetect = 1; |
269 | MESSAGE (KERN_INFO, "%s", | |
270 | "turning to autodetection mode"); | |
271 | return residual_str; | |
272 | } | |
40545573 | 273 | if (strncmp("probeonly", parsestring, length) == 0) { |
1da177e4 LT |
274 | dasd_probeonly = 1; |
275 | MESSAGE(KERN_INFO, "%s", | |
276 | "turning to probeonly mode"); | |
277 | return residual_str; | |
278 | } | |
40545573 | 279 | if (strncmp("nopav", parsestring, length) == 0) { |
dcd707b4 PO |
280 | if (MACHINE_IS_VM) |
281 | MESSAGE(KERN_INFO, "%s", "'nopav' not supported on VM"); | |
282 | else { | |
283 | dasd_nopav = 1; | |
284 | MESSAGE(KERN_INFO, "%s", "disable PAV mode"); | |
285 | } | |
40545573 HH |
286 | return residual_str; |
287 | } | |
288 | if (strncmp("fixedbuffers", parsestring, length) == 0) { | |
1da177e4 LT |
289 | if (dasd_page_cache) |
290 | return residual_str; | |
291 | dasd_page_cache = | |
2f6c55fc HC |
292 | kmem_cache_create("dasd_page_cache", PAGE_SIZE, |
293 | PAGE_SIZE, SLAB_CACHE_DMA, | |
20c2df83 | 294 | NULL); |
1da177e4 LT |
295 | if (!dasd_page_cache) |
296 | MESSAGE(KERN_WARNING, "%s", "Failed to create slab, " | |
297 | "fixed buffer mode disabled."); | |
298 | else | |
299 | MESSAGE (KERN_INFO, "%s", | |
300 | "turning on fixed buffer mode"); | |
301 | return residual_str; | |
302 | } | |
303 | return ERR_PTR(-EINVAL); | |
304 | } | |
305 | ||
306 | /* | |
307 | * Try to interprete the first element on the comma separated parse string | |
308 | * as a device number or a range of devices. If the interpretation is | |
309 | * successfull, create the matching dasd_devmap entries and return a pointer | |
310 | * to the residual string. | |
311 | * If interpretation fails or in case of an error, return an error code. | |
312 | */ | |
313 | static char * | |
314 | dasd_parse_range( char *parsestring ) { | |
315 | ||
316 | struct dasd_devmap *devmap; | |
317 | int from, from_id0, from_id1; | |
318 | int to, to_id0, to_id1; | |
319 | int features, rc; | |
320 | char bus_id[BUS_ID_SIZE+1], *str; | |
321 | ||
322 | str = parsestring; | |
323 | rc = dasd_busid(&str, &from_id0, &from_id1, &from); | |
324 | if (rc == 0) { | |
325 | to = from; | |
326 | to_id0 = from_id0; | |
327 | to_id1 = from_id1; | |
328 | if (*str == '-') { | |
329 | str++; | |
330 | rc = dasd_busid(&str, &to_id0, &to_id1, &to); | |
331 | } | |
332 | } | |
333 | if (rc == 0 && | |
334 | (from_id0 != to_id0 || from_id1 != to_id1 || from > to)) | |
335 | rc = -EINVAL; | |
336 | if (rc) { | |
337 | MESSAGE(KERN_ERR, "Invalid device range %s", parsestring); | |
338 | return ERR_PTR(rc); | |
339 | } | |
340 | features = dasd_feature_list(str, &str); | |
341 | if (features < 0) | |
342 | return ERR_PTR(-EINVAL); | |
40545573 HH |
343 | /* each device in dasd= parameter should be set initially online */ |
344 | features |= DASD_FEATURE_INITIAL_ONLINE; | |
1da177e4 LT |
345 | while (from <= to) { |
346 | sprintf(bus_id, "%01x.%01x.%04x", | |
347 | from_id0, from_id1, from++); | |
348 | devmap = dasd_add_busid(bus_id, features); | |
349 | if (IS_ERR(devmap)) | |
350 | return (char *)devmap; | |
351 | } | |
352 | if (*str == ',') | |
353 | return str + 1; | |
354 | if (*str == '\0') | |
355 | return str; | |
356 | MESSAGE(KERN_WARNING, | |
357 | "junk at end of dasd parameter string: %s\n", str); | |
358 | return ERR_PTR(-EINVAL); | |
359 | } | |
360 | ||
4d284cac | 361 | static char * |
1da177e4 LT |
362 | dasd_parse_next_element( char *parsestring ) { |
363 | char * residual_str; | |
364 | residual_str = dasd_parse_keyword(parsestring); | |
365 | if (!IS_ERR(residual_str)) | |
366 | return residual_str; | |
367 | residual_str = dasd_parse_range(parsestring); | |
368 | return residual_str; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Parse parameters stored in dasd[] | |
373 | * The 'dasd=...' parameter allows to specify a comma separated list of | |
374 | * keywords and device ranges. When the dasd driver is build into the kernel, | |
375 | * the complete list will be stored as one element of the dasd[] array. | |
376 | * When the dasd driver is build as a module, then the list is broken into | |
377 | * it's elements and each dasd[] entry contains one element. | |
378 | */ | |
379 | int | |
380 | dasd_parse(void) | |
381 | { | |
382 | int rc, i; | |
383 | char *parsestring; | |
384 | ||
385 | rc = 0; | |
386 | for (i = 0; i < 256; i++) { | |
387 | if (dasd[i] == NULL) | |
388 | break; | |
389 | parsestring = dasd[i]; | |
390 | /* loop over the comma separated list in the parsestring */ | |
391 | while (*parsestring) { | |
392 | parsestring = dasd_parse_next_element(parsestring); | |
393 | if(IS_ERR(parsestring)) { | |
394 | rc = PTR_ERR(parsestring); | |
395 | break; | |
396 | } | |
397 | } | |
398 | if (rc) { | |
399 | DBF_EVENT(DBF_ALERT, "%s", "invalid range found"); | |
400 | break; | |
401 | } | |
402 | } | |
403 | return rc; | |
404 | } | |
405 | ||
406 | /* | |
407 | * Add a devmap for the device specified by busid. It is possible that | |
408 | * the devmap already exists (dasd= parameter). The order of the devices | |
409 | * added through this function will define the kdevs for the individual | |
138c014d | 410 | * devices. |
1da177e4 LT |
411 | */ |
412 | static struct dasd_devmap * | |
413 | dasd_add_busid(char *bus_id, int features) | |
414 | { | |
415 | struct dasd_devmap *devmap, *new, *tmp; | |
416 | int hash; | |
417 | ||
418 | new = (struct dasd_devmap *) | |
138c014d | 419 | kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); |
1da177e4 LT |
420 | if (!new) |
421 | return ERR_PTR(-ENOMEM); | |
422 | spin_lock(&dasd_devmap_lock); | |
d2c993d8 | 423 | devmap = NULL; |
1da177e4 LT |
424 | hash = dasd_hash_busid(bus_id); |
425 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) | |
426 | if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) { | |
427 | devmap = tmp; | |
428 | break; | |
429 | } | |
430 | if (!devmap) { | |
431 | /* This bus_id is new. */ | |
432 | new->devindex = dasd_max_devindex++; | |
433 | strncpy(new->bus_id, bus_id, BUS_ID_SIZE); | |
434 | new->features = features; | |
d2c993d8 | 435 | new->device = NULL; |
1da177e4 LT |
436 | list_add(&new->list, &dasd_hashlists[hash]); |
437 | devmap = new; | |
d2c993d8 | 438 | new = NULL; |
1da177e4 LT |
439 | } |
440 | spin_unlock(&dasd_devmap_lock); | |
17fd682e | 441 | kfree(new); |
1da177e4 LT |
442 | return devmap; |
443 | } | |
444 | ||
445 | /* | |
446 | * Find devmap for device with given bus_id. | |
447 | */ | |
448 | static struct dasd_devmap * | |
449 | dasd_find_busid(char *bus_id) | |
450 | { | |
451 | struct dasd_devmap *devmap, *tmp; | |
452 | int hash; | |
453 | ||
454 | spin_lock(&dasd_devmap_lock); | |
455 | devmap = ERR_PTR(-ENODEV); | |
456 | hash = dasd_hash_busid(bus_id); | |
457 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) { | |
458 | if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) { | |
459 | devmap = tmp; | |
460 | break; | |
461 | } | |
462 | } | |
463 | spin_unlock(&dasd_devmap_lock); | |
464 | return devmap; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Check if busid has been added to the list of dasd ranges. | |
469 | */ | |
470 | int | |
471 | dasd_busid_known(char *bus_id) | |
472 | { | |
473 | return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Forget all about the device numbers added so far. | |
478 | * This may only be called at module unload or system shutdown. | |
479 | */ | |
480 | static void | |
481 | dasd_forget_ranges(void) | |
482 | { | |
483 | struct dasd_devmap *devmap, *n; | |
484 | int i; | |
485 | ||
486 | spin_lock(&dasd_devmap_lock); | |
487 | for (i = 0; i < 256; i++) { | |
488 | list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { | |
606f4422 | 489 | BUG_ON(devmap->device != NULL); |
1da177e4 LT |
490 | list_del(&devmap->list); |
491 | kfree(devmap); | |
492 | } | |
493 | } | |
494 | spin_unlock(&dasd_devmap_lock); | |
495 | } | |
496 | ||
497 | /* | |
498 | * Find the device struct by its device index. | |
499 | */ | |
500 | struct dasd_device * | |
501 | dasd_device_from_devindex(int devindex) | |
502 | { | |
503 | struct dasd_devmap *devmap, *tmp; | |
504 | struct dasd_device *device; | |
505 | int i; | |
506 | ||
507 | spin_lock(&dasd_devmap_lock); | |
d2c993d8 | 508 | devmap = NULL; |
1da177e4 LT |
509 | for (i = 0; (i < 256) && !devmap; i++) |
510 | list_for_each_entry(tmp, &dasd_hashlists[i], list) | |
511 | if (tmp->devindex == devindex) { | |
512 | /* Found the devmap for the device. */ | |
513 | devmap = tmp; | |
514 | break; | |
515 | } | |
516 | if (devmap && devmap->device) { | |
517 | device = devmap->device; | |
518 | dasd_get_device(device); | |
519 | } else | |
520 | device = ERR_PTR(-ENODEV); | |
521 | spin_unlock(&dasd_devmap_lock); | |
522 | return device; | |
523 | } | |
524 | ||
525 | /* | |
526 | * Return devmap for cdev. If no devmap exists yet, create one and | |
527 | * connect it to the cdev. | |
528 | */ | |
529 | static struct dasd_devmap * | |
530 | dasd_devmap_from_cdev(struct ccw_device *cdev) | |
531 | { | |
532 | struct dasd_devmap *devmap; | |
533 | ||
534 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
535 | if (IS_ERR(devmap)) | |
536 | devmap = dasd_add_busid(cdev->dev.bus_id, | |
537 | DASD_FEATURE_DEFAULT); | |
538 | return devmap; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Create a dasd device structure for cdev. | |
543 | */ | |
544 | struct dasd_device * | |
545 | dasd_create_device(struct ccw_device *cdev) | |
546 | { | |
547 | struct dasd_devmap *devmap; | |
548 | struct dasd_device *device; | |
a00bfd71 | 549 | unsigned long flags; |
1da177e4 LT |
550 | int rc; |
551 | ||
552 | devmap = dasd_devmap_from_cdev(cdev); | |
553 | if (IS_ERR(devmap)) | |
554 | return (void *) devmap; | |
1da177e4 LT |
555 | |
556 | device = dasd_alloc_device(); | |
557 | if (IS_ERR(device)) | |
558 | return device; | |
a00bfd71 | 559 | atomic_set(&device->ref_count, 3); |
1da177e4 LT |
560 | |
561 | spin_lock(&dasd_devmap_lock); | |
562 | if (!devmap->device) { | |
563 | devmap->device = device; | |
564 | device->devindex = devmap->devindex; | |
c6eb7b77 | 565 | device->features = devmap->features; |
1da177e4 LT |
566 | get_device(&cdev->dev); |
567 | device->cdev = cdev; | |
568 | rc = 0; | |
569 | } else | |
570 | /* Someone else was faster. */ | |
571 | rc = -EBUSY; | |
572 | spin_unlock(&dasd_devmap_lock); | |
573 | ||
574 | if (rc) { | |
575 | dasd_free_device(device); | |
576 | return ERR_PTR(rc); | |
577 | } | |
a00bfd71 MS |
578 | |
579 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
580 | cdev->dev.driver_data = device; | |
581 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
582 | ||
1da177e4 LT |
583 | return device; |
584 | } | |
585 | ||
586 | /* | |
587 | * Wait queue for dasd_delete_device waits. | |
588 | */ | |
589 | static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); | |
590 | ||
591 | /* | |
592 | * Remove a dasd device structure. The passed referenced | |
593 | * is destroyed. | |
594 | */ | |
595 | void | |
596 | dasd_delete_device(struct dasd_device *device) | |
597 | { | |
598 | struct ccw_device *cdev; | |
599 | struct dasd_devmap *devmap; | |
a00bfd71 | 600 | unsigned long flags; |
1da177e4 LT |
601 | |
602 | /* First remove device pointer from devmap. */ | |
603 | devmap = dasd_find_busid(device->cdev->dev.bus_id); | |
606f4422 | 604 | BUG_ON(IS_ERR(devmap)); |
1da177e4 LT |
605 | spin_lock(&dasd_devmap_lock); |
606 | if (devmap->device != device) { | |
607 | spin_unlock(&dasd_devmap_lock); | |
608 | dasd_put_device(device); | |
609 | return; | |
610 | } | |
611 | devmap->device = NULL; | |
612 | spin_unlock(&dasd_devmap_lock); | |
613 | ||
a00bfd71 MS |
614 | /* Disconnect dasd_device structure from ccw_device structure. */ |
615 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
616 | device->cdev->dev.driver_data = NULL; | |
617 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
618 | ||
619 | /* | |
620 | * Drop ref_count by 3, one for the devmap reference, one for | |
621 | * the cdev reference and one for the passed reference. | |
622 | */ | |
623 | atomic_sub(3, &device->ref_count); | |
1da177e4 LT |
624 | |
625 | /* Wait for reference counter to drop to zero. */ | |
626 | wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); | |
627 | ||
628 | /* Disconnect dasd_device structure from ccw_device structure. */ | |
629 | cdev = device->cdev; | |
630 | device->cdev = NULL; | |
631 | ||
1da177e4 LT |
632 | /* Put ccw_device structure. */ |
633 | put_device(&cdev->dev); | |
634 | ||
635 | /* Now the device structure can be freed. */ | |
636 | dasd_free_device(device); | |
637 | } | |
638 | ||
639 | /* | |
640 | * Reference counter dropped to zero. Wake up waiter | |
641 | * in dasd_delete_device. | |
642 | */ | |
643 | void | |
644 | dasd_put_device_wake(struct dasd_device *device) | |
645 | { | |
646 | wake_up(&dasd_delete_wq); | |
647 | } | |
648 | ||
a00bfd71 MS |
649 | /* |
650 | * Return dasd_device structure associated with cdev. | |
651 | * This function needs to be called with the ccw device | |
652 | * lock held. It can be used from interrupt context. | |
653 | */ | |
654 | struct dasd_device * | |
655 | dasd_device_from_cdev_locked(struct ccw_device *cdev) | |
656 | { | |
657 | struct dasd_device *device = cdev->dev.driver_data; | |
658 | ||
659 | if (!device) | |
660 | return ERR_PTR(-ENODEV); | |
661 | dasd_get_device(device); | |
662 | return device; | |
663 | } | |
664 | ||
1da177e4 LT |
665 | /* |
666 | * Return dasd_device structure associated with cdev. | |
667 | */ | |
668 | struct dasd_device * | |
669 | dasd_device_from_cdev(struct ccw_device *cdev) | |
670 | { | |
1da177e4 | 671 | struct dasd_device *device; |
a00bfd71 | 672 | unsigned long flags; |
1da177e4 | 673 | |
a00bfd71 MS |
674 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
675 | device = dasd_device_from_cdev_locked(cdev); | |
676 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1da177e4 LT |
677 | return device; |
678 | } | |
679 | ||
680 | /* | |
681 | * SECTION: files in sysfs | |
682 | */ | |
683 | ||
684 | /* | |
685 | * readonly controls the readonly status of a dasd | |
686 | */ | |
687 | static ssize_t | |
e404e274 | 688 | dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
689 | { |
690 | struct dasd_devmap *devmap; | |
691 | int ro_flag; | |
692 | ||
693 | devmap = dasd_find_busid(dev->bus_id); | |
694 | if (!IS_ERR(devmap)) | |
695 | ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0; | |
696 | else | |
697 | ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0; | |
698 | return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); | |
699 | } | |
700 | ||
701 | static ssize_t | |
138c014d HH |
702 | dasd_ro_store(struct device *dev, struct device_attribute *attr, |
703 | const char *buf, size_t count) | |
1da177e4 LT |
704 | { |
705 | struct dasd_devmap *devmap; | |
01376f44 HH |
706 | int val; |
707 | char *endp; | |
1da177e4 LT |
708 | |
709 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
710 | if (IS_ERR(devmap)) | |
711 | return PTR_ERR(devmap); | |
01376f44 HH |
712 | |
713 | val = simple_strtoul(buf, &endp, 0); | |
714 | if (((endp + 1) < (buf + count)) || (val > 1)) | |
715 | return -EINVAL; | |
716 | ||
1da177e4 | 717 | spin_lock(&dasd_devmap_lock); |
01376f44 | 718 | if (val) |
1da177e4 LT |
719 | devmap->features |= DASD_FEATURE_READONLY; |
720 | else | |
721 | devmap->features &= ~DASD_FEATURE_READONLY; | |
c6eb7b77 HH |
722 | if (devmap->device) |
723 | devmap->device->features = devmap->features; | |
f24acd45 | 724 | if (devmap->device && devmap->device->gdp) |
01376f44 | 725 | set_disk_ro(devmap->device->gdp, val); |
1da177e4 LT |
726 | spin_unlock(&dasd_devmap_lock); |
727 | return count; | |
728 | } | |
729 | ||
730 | static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); | |
9575bf26 HH |
731 | /* |
732 | * erplog controls the logging of ERP related data | |
733 | * (e.g. failing channel programs). | |
734 | */ | |
735 | static ssize_t | |
736 | dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) | |
737 | { | |
738 | struct dasd_devmap *devmap; | |
739 | int erplog; | |
740 | ||
741 | devmap = dasd_find_busid(dev->bus_id); | |
742 | if (!IS_ERR(devmap)) | |
743 | erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; | |
744 | else | |
745 | erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; | |
746 | return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n"); | |
747 | } | |
748 | ||
749 | static ssize_t | |
750 | dasd_erplog_store(struct device *dev, struct device_attribute *attr, | |
751 | const char *buf, size_t count) | |
752 | { | |
753 | struct dasd_devmap *devmap; | |
754 | int val; | |
755 | char *endp; | |
756 | ||
757 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
758 | if (IS_ERR(devmap)) | |
759 | return PTR_ERR(devmap); | |
760 | ||
761 | val = simple_strtoul(buf, &endp, 0); | |
762 | if (((endp + 1) < (buf + count)) || (val > 1)) | |
763 | return -EINVAL; | |
764 | ||
765 | spin_lock(&dasd_devmap_lock); | |
766 | if (val) | |
767 | devmap->features |= DASD_FEATURE_ERPLOG; | |
768 | else | |
769 | devmap->features &= ~DASD_FEATURE_ERPLOG; | |
770 | if (devmap->device) | |
771 | devmap->device->features = devmap->features; | |
772 | spin_unlock(&dasd_devmap_lock); | |
773 | return count; | |
774 | } | |
775 | ||
776 | static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store); | |
1da177e4 LT |
777 | |
778 | /* | |
779 | * use_diag controls whether the driver should use diag rather than ssch | |
780 | * to talk to the device | |
781 | */ | |
138c014d | 782 | static ssize_t |
e404e274 | 783 | dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
784 | { |
785 | struct dasd_devmap *devmap; | |
786 | int use_diag; | |
787 | ||
788 | devmap = dasd_find_busid(dev->bus_id); | |
789 | if (!IS_ERR(devmap)) | |
790 | use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; | |
791 | else | |
792 | use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; | |
793 | return sprintf(buf, use_diag ? "1\n" : "0\n"); | |
794 | } | |
795 | ||
796 | static ssize_t | |
138c014d HH |
797 | dasd_use_diag_store(struct device *dev, struct device_attribute *attr, |
798 | const char *buf, size_t count) | |
1da177e4 LT |
799 | { |
800 | struct dasd_devmap *devmap; | |
801 | ssize_t rc; | |
01376f44 HH |
802 | int val; |
803 | char *endp; | |
1da177e4 LT |
804 | |
805 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
806 | if (IS_ERR(devmap)) | |
807 | return PTR_ERR(devmap); | |
01376f44 HH |
808 | |
809 | val = simple_strtoul(buf, &endp, 0); | |
810 | if (((endp + 1) < (buf + count)) || (val > 1)) | |
811 | return -EINVAL; | |
812 | ||
1da177e4 LT |
813 | spin_lock(&dasd_devmap_lock); |
814 | /* Changing diag discipline flag is only allowed in offline state. */ | |
815 | rc = count; | |
816 | if (!devmap->device) { | |
01376f44 | 817 | if (val) |
1da177e4 LT |
818 | devmap->features |= DASD_FEATURE_USEDIAG; |
819 | else | |
820 | devmap->features &= ~DASD_FEATURE_USEDIAG; | |
821 | } else | |
822 | rc = -EPERM; | |
823 | spin_unlock(&dasd_devmap_lock); | |
824 | return rc; | |
825 | } | |
826 | ||
138c014d | 827 | static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); |
1da177e4 LT |
828 | |
829 | static ssize_t | |
138c014d HH |
830 | dasd_discipline_show(struct device *dev, struct device_attribute *attr, |
831 | char *buf) | |
1da177e4 | 832 | { |
a00bfd71 MS |
833 | struct dasd_device *device; |
834 | ssize_t len; | |
1da177e4 | 835 | |
a00bfd71 MS |
836 | device = dasd_device_from_cdev(to_ccwdev(dev)); |
837 | if (!IS_ERR(device) && device->discipline) { | |
838 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
839 | device->discipline->name); | |
840 | dasd_put_device(device); | |
841 | } else | |
842 | len = snprintf(buf, PAGE_SIZE, "none\n"); | |
843 | return len; | |
1da177e4 LT |
844 | } |
845 | ||
846 | static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); | |
847 | ||
4dfd5c45 HH |
848 | static ssize_t |
849 | dasd_device_status_show(struct device *dev, struct device_attribute *attr, | |
850 | char *buf) | |
851 | { | |
852 | struct dasd_device *device; | |
853 | ssize_t len; | |
854 | ||
855 | device = dasd_device_from_cdev(to_ccwdev(dev)); | |
856 | if (!IS_ERR(device)) { | |
857 | switch (device->state) { | |
858 | case DASD_STATE_NEW: | |
859 | len = snprintf(buf, PAGE_SIZE, "new\n"); | |
860 | break; | |
861 | case DASD_STATE_KNOWN: | |
862 | len = snprintf(buf, PAGE_SIZE, "detected\n"); | |
863 | break; | |
864 | case DASD_STATE_BASIC: | |
865 | len = snprintf(buf, PAGE_SIZE, "basic\n"); | |
866 | break; | |
867 | case DASD_STATE_UNFMT: | |
868 | len = snprintf(buf, PAGE_SIZE, "unformatted\n"); | |
869 | break; | |
870 | case DASD_STATE_READY: | |
871 | len = snprintf(buf, PAGE_SIZE, "ready\n"); | |
872 | break; | |
873 | case DASD_STATE_ONLINE: | |
874 | len = snprintf(buf, PAGE_SIZE, "online\n"); | |
875 | break; | |
876 | default: | |
877 | len = snprintf(buf, PAGE_SIZE, "no stat\n"); | |
878 | break; | |
879 | } | |
880 | dasd_put_device(device); | |
881 | } else | |
882 | len = snprintf(buf, PAGE_SIZE, "unknown\n"); | |
883 | return len; | |
884 | } | |
885 | ||
886 | static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL); | |
887 | ||
3d052595 HH |
888 | static ssize_t |
889 | dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf) | |
890 | { | |
891 | struct dasd_devmap *devmap; | |
892 | int alias; | |
893 | ||
894 | devmap = dasd_find_busid(dev->bus_id); | |
895 | spin_lock(&dasd_devmap_lock); | |
896 | if (!IS_ERR(devmap)) | |
897 | alias = devmap->uid.alias; | |
898 | else | |
899 | alias = 0; | |
900 | spin_unlock(&dasd_devmap_lock); | |
901 | ||
902 | return sprintf(buf, alias ? "1\n" : "0\n"); | |
903 | } | |
904 | ||
905 | static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); | |
906 | ||
907 | static ssize_t | |
908 | dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf) | |
909 | { | |
910 | struct dasd_devmap *devmap; | |
911 | char *vendor; | |
912 | ||
913 | devmap = dasd_find_busid(dev->bus_id); | |
914 | spin_lock(&dasd_devmap_lock); | |
915 | if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) | |
916 | vendor = devmap->uid.vendor; | |
917 | else | |
918 | vendor = ""; | |
919 | spin_unlock(&dasd_devmap_lock); | |
920 | ||
921 | return snprintf(buf, PAGE_SIZE, "%s\n", vendor); | |
922 | } | |
923 | ||
924 | static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); | |
925 | ||
926 | #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ | |
927 | /* SSID */ 4 + 1 + /* unit addr */ 2 + 1) | |
928 | ||
929 | static ssize_t | |
930 | dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
931 | { | |
932 | struct dasd_devmap *devmap; | |
933 | char uid[UID_STRLEN]; | |
934 | ||
935 | devmap = dasd_find_busid(dev->bus_id); | |
936 | spin_lock(&dasd_devmap_lock); | |
937 | if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) | |
938 | snprintf(uid, sizeof(uid), "%s.%s.%04x.%02x", | |
939 | devmap->uid.vendor, devmap->uid.serial, | |
940 | devmap->uid.ssid, devmap->uid.unit_addr); | |
941 | else | |
942 | uid[0] = 0; | |
943 | spin_unlock(&dasd_devmap_lock); | |
944 | ||
945 | return snprintf(buf, PAGE_SIZE, "%s\n", uid); | |
946 | } | |
947 | ||
948 | static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); | |
949 | ||
20c64468 SW |
950 | /* |
951 | * extended error-reporting | |
952 | */ | |
953 | static ssize_t | |
954 | dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) | |
955 | { | |
956 | struct dasd_devmap *devmap; | |
957 | int eer_flag; | |
958 | ||
959 | devmap = dasd_find_busid(dev->bus_id); | |
960 | if (!IS_ERR(devmap) && devmap->device) | |
961 | eer_flag = dasd_eer_enabled(devmap->device); | |
962 | else | |
963 | eer_flag = 0; | |
964 | return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); | |
965 | } | |
966 | ||
967 | static ssize_t | |
968 | dasd_eer_store(struct device *dev, struct device_attribute *attr, | |
969 | const char *buf, size_t count) | |
970 | { | |
971 | struct dasd_devmap *devmap; | |
01376f44 HH |
972 | int val, rc; |
973 | char *endp; | |
20c64468 SW |
974 | |
975 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
976 | if (IS_ERR(devmap)) | |
977 | return PTR_ERR(devmap); | |
978 | if (!devmap->device) | |
01376f44 HH |
979 | return -ENODEV; |
980 | ||
981 | val = simple_strtoul(buf, &endp, 0); | |
982 | if (((endp + 1) < (buf + count)) || (val > 1)) | |
983 | return -EINVAL; | |
984 | ||
645c98c8 | 985 | if (val) { |
20c64468 | 986 | rc = dasd_eer_enable(devmap->device); |
645c98c8 HH |
987 | if (rc) |
988 | return rc; | |
989 | } else | |
20c64468 | 990 | dasd_eer_disable(devmap->device); |
645c98c8 | 991 | return count; |
20c64468 SW |
992 | } |
993 | ||
994 | static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); | |
995 | ||
1da177e4 LT |
996 | static struct attribute * dasd_attrs[] = { |
997 | &dev_attr_readonly.attr, | |
998 | &dev_attr_discipline.attr, | |
4dfd5c45 | 999 | &dev_attr_status.attr, |
3d052595 HH |
1000 | &dev_attr_alias.attr, |
1001 | &dev_attr_vendor.attr, | |
1002 | &dev_attr_uid.attr, | |
1da177e4 | 1003 | &dev_attr_use_diag.attr, |
20c64468 | 1004 | &dev_attr_eer_enabled.attr, |
9575bf26 | 1005 | &dev_attr_erplog.attr, |
1da177e4 LT |
1006 | NULL, |
1007 | }; | |
1008 | ||
1009 | static struct attribute_group dasd_attr_group = { | |
1010 | .attrs = dasd_attrs, | |
1011 | }; | |
1012 | ||
3d052595 HH |
1013 | /* |
1014 | * Return copy of the device unique identifier. | |
1015 | */ | |
1016 | int | |
1017 | dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid) | |
1018 | { | |
1019 | struct dasd_devmap *devmap; | |
1020 | ||
1021 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
1022 | if (IS_ERR(devmap)) | |
1023 | return PTR_ERR(devmap); | |
1024 | spin_lock(&dasd_devmap_lock); | |
1025 | *uid = devmap->uid; | |
1026 | spin_unlock(&dasd_devmap_lock); | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Register the given device unique identifier into devmap struct. | |
b18a60e7 PO |
1032 | * In addition check if the related storage server subsystem ID is already |
1033 | * contained in the dasd_server_ssid_list. If subsystem ID is not contained, | |
1034 | * create new entry. | |
40545573 HH |
1035 | * Return 0 if server was already in serverlist, |
1036 | * 1 if the server was added successful | |
1037 | * <0 in case of error. | |
3d052595 HH |
1038 | */ |
1039 | int | |
1040 | dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid) | |
1041 | { | |
1042 | struct dasd_devmap *devmap; | |
b18a60e7 | 1043 | struct dasd_server_ssid_map *srv, *tmp; |
3d052595 HH |
1044 | |
1045 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
1046 | if (IS_ERR(devmap)) | |
1047 | return PTR_ERR(devmap); | |
d0710c7c | 1048 | |
b18a60e7 PO |
1049 | /* generate entry for server_ssid_map */ |
1050 | srv = (struct dasd_server_ssid_map *) | |
1051 | kzalloc(sizeof(struct dasd_server_ssid_map), GFP_KERNEL); | |
d0710c7c HH |
1052 | if (!srv) |
1053 | return -ENOMEM; | |
1054 | strncpy(srv->sid.vendor, uid->vendor, sizeof(srv->sid.vendor) - 1); | |
1055 | strncpy(srv->sid.serial, uid->serial, sizeof(srv->sid.serial) - 1); | |
8e79a441 | 1056 | srv->sid.ssid = uid->ssid; |
d0710c7c HH |
1057 | |
1058 | /* server is already contained ? */ | |
3d052595 HH |
1059 | spin_lock(&dasd_devmap_lock); |
1060 | devmap->uid = *uid; | |
b18a60e7 | 1061 | list_for_each_entry(tmp, &dasd_server_ssid_list, list) { |
d0710c7c | 1062 | if (!memcmp(&srv->sid, &tmp->sid, |
8e79a441 | 1063 | sizeof(struct system_id))) { |
d0710c7c HH |
1064 | kfree(srv); |
1065 | srv = NULL; | |
1066 | break; | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | /* add servermap to serverlist */ | |
1071 | if (srv) | |
b18a60e7 | 1072 | list_add(&srv->list, &dasd_server_ssid_list); |
3d052595 | 1073 | spin_unlock(&dasd_devmap_lock); |
d0710c7c HH |
1074 | |
1075 | return (srv ? 1 : 0); | |
3d052595 | 1076 | } |
40545573 | 1077 | EXPORT_SYMBOL_GPL(dasd_set_uid); |
3d052595 | 1078 | |
f24acd45 HH |
1079 | /* |
1080 | * Return value of the specified feature. | |
1081 | */ | |
1082 | int | |
1083 | dasd_get_feature(struct ccw_device *cdev, int feature) | |
1084 | { | |
1085 | struct dasd_devmap *devmap; | |
1086 | ||
1087 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
1088 | if (IS_ERR(devmap)) | |
40545573 | 1089 | return PTR_ERR(devmap); |
f24acd45 HH |
1090 | |
1091 | return ((devmap->features & feature) != 0); | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * Set / reset given feature. | |
1096 | * Flag indicates wether to set (!=0) or the reset (=0) the feature. | |
1097 | */ | |
1098 | int | |
1099 | dasd_set_feature(struct ccw_device *cdev, int feature, int flag) | |
1100 | { | |
1101 | struct dasd_devmap *devmap; | |
1102 | ||
1103 | devmap = dasd_find_busid(cdev->dev.bus_id); | |
1104 | if (IS_ERR(devmap)) | |
40545573 | 1105 | return PTR_ERR(devmap); |
f24acd45 HH |
1106 | |
1107 | spin_lock(&dasd_devmap_lock); | |
1108 | if (flag) | |
1109 | devmap->features |= feature; | |
1110 | else | |
1111 | devmap->features &= ~feature; | |
c6eb7b77 HH |
1112 | if (devmap->device) |
1113 | devmap->device->features = devmap->features; | |
f24acd45 HH |
1114 | spin_unlock(&dasd_devmap_lock); |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | ||
1da177e4 LT |
1119 | int |
1120 | dasd_add_sysfs_files(struct ccw_device *cdev) | |
1121 | { | |
1122 | return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group); | |
1123 | } | |
1124 | ||
1125 | void | |
1126 | dasd_remove_sysfs_files(struct ccw_device *cdev) | |
1127 | { | |
1128 | sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group); | |
1129 | } | |
1130 | ||
1131 | ||
1132 | int | |
1133 | dasd_devmap_init(void) | |
1134 | { | |
1135 | int i; | |
1136 | ||
1137 | /* Initialize devmap structures. */ | |
1138 | dasd_max_devindex = 0; | |
1139 | for (i = 0; i < 256; i++) | |
1140 | INIT_LIST_HEAD(&dasd_hashlists[i]); | |
1da177e4 | 1141 | |
40545573 | 1142 | /* Initialize servermap structure. */ |
b18a60e7 | 1143 | INIT_LIST_HEAD(&dasd_server_ssid_list); |
40545573 | 1144 | return 0; |
1da177e4 LT |
1145 | } |
1146 | ||
1147 | void | |
1148 | dasd_devmap_exit(void) | |
1149 | { | |
1150 | dasd_forget_ranges(); | |
1151 | } |