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:" | |
98df67b3 | 26 | #define DASD_BUS_ID_SIZE 20 |
1da177e4 LT |
27 | |
28 | #include "dasd_int.h" | |
29 | ||
e18b890b | 30 | struct kmem_cache *dasd_page_cache; |
40545573 | 31 | EXPORT_SYMBOL_GPL(dasd_page_cache); |
1da177e4 LT |
32 | |
33 | /* | |
34 | * dasd_devmap_t is used to store the features and the relation | |
35 | * between device number and device index. To find a dasd_devmap_t | |
36 | * that corresponds to a device number of a device index each | |
37 | * dasd_devmap_t is added to two linked lists, one to search by | |
38 | * the device number and one to search by the device index. As | |
39 | * soon as big minor numbers are available the device index list | |
40 | * can be removed since the device number will then be identical | |
41 | * to the device index. | |
42 | */ | |
43 | struct dasd_devmap { | |
44 | struct list_head list; | |
98df67b3 | 45 | char bus_id[DASD_BUS_ID_SIZE]; |
1da177e4 LT |
46 | unsigned int devindex; |
47 | unsigned short features; | |
48 | struct dasd_device *device; | |
3d052595 | 49 | struct dasd_uid uid; |
1da177e4 LT |
50 | }; |
51 | ||
52 | /* | |
53 | * Parameter parsing functions for dasd= parameter. The syntax is: | |
54 | * <devno> : (0x)?[0-9a-fA-F]+ | |
55 | * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ | |
56 | * <feature> : ro | |
57 | * <feature_list> : \(<feature>(:<feature>)*\) | |
58 | * <devno-range> : <devno>(-<devno>)?<feature_list>? | |
59 | * <busid-range> : <busid>(-<busid>)?<feature_list>? | |
60 | * <devices> : <devno-range>|<busid-range> | |
61 | * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod | |
62 | * | |
63 | * <dasd> : autodetect|probeonly|<devices>(,<devices>)* | |
64 | */ | |
65 | ||
66 | int dasd_probeonly = 0; /* is true, when probeonly mode is active */ | |
67 | int dasd_autodetect = 0; /* is true, when autodetection is active */ | |
40545573 HH |
68 | int dasd_nopav = 0; /* is true, when PAV is disabled */ |
69 | EXPORT_SYMBOL_GPL(dasd_nopav); | |
1da177e4 LT |
70 | |
71 | /* | |
72 | * char *dasd[] is intended to hold the ranges supplied by the dasd= statement | |
73 | * it is named 'dasd' to directly be filled by insmod with the comma separated | |
74 | * strings when running as a module. | |
75 | */ | |
76 | static char *dasd[256]; | |
8d3b33f6 RR |
77 | module_param_array(dasd, charp, NULL, 0); |
78 | ||
1da177e4 | 79 | /* |
d0710c7c | 80 | * Single spinlock to protect devmap and servermap structures and lists. |
1da177e4 LT |
81 | */ |
82 | static DEFINE_SPINLOCK(dasd_devmap_lock); | |
83 | ||
84 | /* | |
85 | * Hash lists for devmap structures. | |
86 | */ | |
87 | static struct list_head dasd_hashlists[256]; | |
88 | int dasd_max_devindex; | |
89 | ||
69f90f6a | 90 | static struct dasd_devmap *dasd_add_busid(const char *, int); |
1da177e4 LT |
91 | |
92 | static inline int | |
69f90f6a | 93 | dasd_hash_busid(const char *bus_id) |
1da177e4 LT |
94 | { |
95 | int hash, i; | |
96 | ||
97 | hash = 0; | |
98df67b3 | 98 | for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++) |
1da177e4 LT |
99 | hash += *bus_id; |
100 | return hash & 0xff; | |
101 | } | |
102 | ||
103 | #ifndef MODULE | |
104 | /* | |
105 | * The parameter parsing functions for builtin-drivers are called | |
106 | * before kmalloc works. Store the pointers to the parameters strings | |
107 | * into dasd[] for later processing. | |
108 | */ | |
109 | static int __init | |
110 | dasd_call_setup(char *str) | |
111 | { | |
112 | static int count = 0; | |
113 | ||
114 | if (count < 256) | |
115 | dasd[count++] = str; | |
116 | return 1; | |
117 | } | |
118 | ||
119 | __setup ("dasd=", dasd_call_setup); | |
120 | #endif /* #ifndef MODULE */ | |
121 | ||
7039d3a1 PO |
122 | #define DASD_IPLDEV "ipldev" |
123 | ||
1da177e4 LT |
124 | /* |
125 | * Read a device busid/devno from a string. | |
126 | */ | |
4d284cac | 127 | static int |
1da177e4 LT |
128 | dasd_busid(char **str, int *id0, int *id1, int *devno) |
129 | { | |
130 | int val, old_style; | |
138c014d | 131 | |
7039d3a1 PO |
132 | /* Interpret ipldev busid */ |
133 | if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) { | |
134 | if (ipl_info.type != IPL_TYPE_CCW) { | |
135 | MESSAGE(KERN_ERR, "%s", "ipl device is not a ccw " | |
136 | "device"); | |
137 | return -EINVAL; | |
138 | } | |
139 | *id0 = 0; | |
140 | *id1 = ipl_info.data.ccw.dev_id.ssid; | |
141 | *devno = ipl_info.data.ccw.dev_id.devno; | |
142 | *str += strlen(DASD_IPLDEV); | |
143 | ||
144 | return 0; | |
145 | } | |
1da177e4 LT |
146 | /* check for leading '0x' */ |
147 | old_style = 0; | |
148 | if ((*str)[0] == '0' && (*str)[1] == 'x') { | |
149 | *str += 2; | |
150 | old_style = 1; | |
151 | } | |
152 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
153 | return -EINVAL; | |
154 | val = simple_strtoul(*str, str, 16); | |
155 | if (old_style || (*str)[0] != '.') { | |
156 | *id0 = *id1 = 0; | |
157 | if (val < 0 || val > 0xffff) | |
158 | return -EINVAL; | |
159 | *devno = val; | |
160 | return 0; | |
161 | } | |
162 | /* New style x.y.z busid */ | |
163 | if (val < 0 || val > 0xff) | |
164 | return -EINVAL; | |
165 | *id0 = val; | |
166 | (*str)++; | |
167 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
168 | return -EINVAL; | |
169 | val = simple_strtoul(*str, str, 16); | |
170 | if (val < 0 || val > 0xff || (*str)++[0] != '.') | |
171 | return -EINVAL; | |
172 | *id1 = val; | |
173 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ | |
174 | return -EINVAL; | |
175 | val = simple_strtoul(*str, str, 16); | |
176 | if (val < 0 || val > 0xffff) | |
177 | return -EINVAL; | |
178 | *devno = val; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Read colon separated list of dasd features. Currently there is | |
184 | * only one: "ro" for read-only devices. The default feature set | |
185 | * is empty (value 0). | |
186 | */ | |
4d284cac | 187 | static int |
1da177e4 LT |
188 | dasd_feature_list(char *str, char **endp) |
189 | { | |
190 | int features, len, rc; | |
191 | ||
192 | rc = 0; | |
193 | if (*str != '(') { | |
194 | *endp = str; | |
195 | return DASD_FEATURE_DEFAULT; | |
196 | } | |
197 | str++; | |
198 | features = 0; | |
199 | ||
200 | while (1) { | |
138c014d | 201 | for (len = 0; |
1da177e4 LT |
202 | str[len] && str[len] != ':' && str[len] != ')'; len++); |
203 | if (len == 2 && !strncmp(str, "ro", 2)) | |
204 | features |= DASD_FEATURE_READONLY; | |
205 | else if (len == 4 && !strncmp(str, "diag", 4)) | |
206 | features |= DASD_FEATURE_USEDIAG; | |
9575bf26 HH |
207 | else if (len == 6 && !strncmp(str, "erplog", 6)) |
208 | features |= DASD_FEATURE_ERPLOG; | |
13de227b HS |
209 | else if (len == 8 && !strncmp(str, "failfast", 8)) |
210 | features |= DASD_FEATURE_FAILFAST; | |
1da177e4 LT |
211 | else { |
212 | MESSAGE(KERN_WARNING, | |
213 | "unsupported feature: %*s, " | |
214 | "ignoring setting", len, str); | |
215 | rc = -EINVAL; | |
216 | } | |
217 | str += len; | |
218 | if (*str != ':') | |
219 | break; | |
220 | str++; | |
221 | } | |
222 | if (*str != ')') { | |
223 | MESSAGE(KERN_WARNING, "%s", | |
224 | "missing ')' in dasd parameter string\n"); | |
225 | rc = -EINVAL; | |
226 | } else | |
227 | str++; | |
228 | *endp = str; | |
229 | if (rc != 0) | |
230 | return rc; | |
231 | return features; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Try to match the first element on the comma separated parse string | |
236 | * with one of the known keywords. If a keyword is found, take the approprate | |
237 | * action and return a pointer to the residual string. If the first element | |
238 | * could not be matched to any keyword then return an error code. | |
239 | */ | |
240 | static char * | |
241 | dasd_parse_keyword( char *parsestring ) { | |
242 | ||
243 | char *nextcomma, *residual_str; | |
244 | int length; | |
245 | ||
246 | nextcomma = strchr(parsestring,','); | |
247 | if (nextcomma) { | |
248 | length = nextcomma - parsestring; | |
249 | residual_str = nextcomma + 1; | |
250 | } else { | |
251 | length = strlen(parsestring); | |
252 | residual_str = parsestring + length; | |
253 | } | |
40545573 | 254 | if (strncmp("autodetect", parsestring, length) == 0) { |
1da177e4 LT |
255 | dasd_autodetect = 1; |
256 | MESSAGE (KERN_INFO, "%s", | |
257 | "turning to autodetection mode"); | |
258 | return residual_str; | |
259 | } | |
40545573 | 260 | if (strncmp("probeonly", parsestring, length) == 0) { |
1da177e4 LT |
261 | dasd_probeonly = 1; |
262 | MESSAGE(KERN_INFO, "%s", | |
263 | "turning to probeonly mode"); | |
264 | return residual_str; | |
265 | } | |
40545573 | 266 | if (strncmp("nopav", parsestring, length) == 0) { |
dcd707b4 PO |
267 | if (MACHINE_IS_VM) |
268 | MESSAGE(KERN_INFO, "%s", "'nopav' not supported on VM"); | |
269 | else { | |
270 | dasd_nopav = 1; | |
271 | MESSAGE(KERN_INFO, "%s", "disable PAV mode"); | |
272 | } | |
40545573 HH |
273 | return residual_str; |
274 | } | |
275 | if (strncmp("fixedbuffers", parsestring, length) == 0) { | |
1da177e4 LT |
276 | if (dasd_page_cache) |
277 | return residual_str; | |
278 | dasd_page_cache = | |
2f6c55fc HC |
279 | kmem_cache_create("dasd_page_cache", PAGE_SIZE, |
280 | PAGE_SIZE, SLAB_CACHE_DMA, | |
20c2df83 | 281 | NULL); |
1da177e4 LT |
282 | if (!dasd_page_cache) |
283 | MESSAGE(KERN_WARNING, "%s", "Failed to create slab, " | |
284 | "fixed buffer mode disabled."); | |
285 | else | |
286 | MESSAGE (KERN_INFO, "%s", | |
287 | "turning on fixed buffer mode"); | |
288 | return residual_str; | |
289 | } | |
290 | return ERR_PTR(-EINVAL); | |
291 | } | |
292 | ||
293 | /* | |
294 | * Try to interprete the first element on the comma separated parse string | |
295 | * as a device number or a range of devices. If the interpretation is | |
296 | * successfull, create the matching dasd_devmap entries and return a pointer | |
297 | * to the residual string. | |
298 | * If interpretation fails or in case of an error, return an error code. | |
299 | */ | |
300 | static char * | |
301 | dasd_parse_range( char *parsestring ) { | |
302 | ||
303 | struct dasd_devmap *devmap; | |
304 | int from, from_id0, from_id1; | |
305 | int to, to_id0, to_id1; | |
306 | int features, rc; | |
98df67b3 | 307 | char bus_id[DASD_BUS_ID_SIZE+1], *str; |
1da177e4 LT |
308 | |
309 | str = parsestring; | |
310 | rc = dasd_busid(&str, &from_id0, &from_id1, &from); | |
311 | if (rc == 0) { | |
312 | to = from; | |
313 | to_id0 = from_id0; | |
314 | to_id1 = from_id1; | |
315 | if (*str == '-') { | |
316 | str++; | |
317 | rc = dasd_busid(&str, &to_id0, &to_id1, &to); | |
318 | } | |
319 | } | |
320 | if (rc == 0 && | |
321 | (from_id0 != to_id0 || from_id1 != to_id1 || from > to)) | |
322 | rc = -EINVAL; | |
323 | if (rc) { | |
324 | MESSAGE(KERN_ERR, "Invalid device range %s", parsestring); | |
325 | return ERR_PTR(rc); | |
326 | } | |
327 | features = dasd_feature_list(str, &str); | |
328 | if (features < 0) | |
329 | return ERR_PTR(-EINVAL); | |
40545573 HH |
330 | /* each device in dasd= parameter should be set initially online */ |
331 | features |= DASD_FEATURE_INITIAL_ONLINE; | |
1da177e4 LT |
332 | while (from <= to) { |
333 | sprintf(bus_id, "%01x.%01x.%04x", | |
334 | from_id0, from_id1, from++); | |
335 | devmap = dasd_add_busid(bus_id, features); | |
336 | if (IS_ERR(devmap)) | |
337 | return (char *)devmap; | |
338 | } | |
339 | if (*str == ',') | |
340 | return str + 1; | |
341 | if (*str == '\0') | |
342 | return str; | |
343 | MESSAGE(KERN_WARNING, | |
344 | "junk at end of dasd parameter string: %s\n", str); | |
345 | return ERR_PTR(-EINVAL); | |
346 | } | |
347 | ||
4d284cac | 348 | static char * |
1da177e4 LT |
349 | dasd_parse_next_element( char *parsestring ) { |
350 | char * residual_str; | |
351 | residual_str = dasd_parse_keyword(parsestring); | |
352 | if (!IS_ERR(residual_str)) | |
353 | return residual_str; | |
354 | residual_str = dasd_parse_range(parsestring); | |
355 | return residual_str; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Parse parameters stored in dasd[] | |
360 | * The 'dasd=...' parameter allows to specify a comma separated list of | |
361 | * keywords and device ranges. When the dasd driver is build into the kernel, | |
362 | * the complete list will be stored as one element of the dasd[] array. | |
363 | * When the dasd driver is build as a module, then the list is broken into | |
364 | * it's elements and each dasd[] entry contains one element. | |
365 | */ | |
366 | int | |
367 | dasd_parse(void) | |
368 | { | |
369 | int rc, i; | |
370 | char *parsestring; | |
371 | ||
372 | rc = 0; | |
373 | for (i = 0; i < 256; i++) { | |
374 | if (dasd[i] == NULL) | |
375 | break; | |
376 | parsestring = dasd[i]; | |
377 | /* loop over the comma separated list in the parsestring */ | |
378 | while (*parsestring) { | |
379 | parsestring = dasd_parse_next_element(parsestring); | |
380 | if(IS_ERR(parsestring)) { | |
381 | rc = PTR_ERR(parsestring); | |
382 | break; | |
383 | } | |
384 | } | |
385 | if (rc) { | |
386 | DBF_EVENT(DBF_ALERT, "%s", "invalid range found"); | |
387 | break; | |
388 | } | |
389 | } | |
390 | return rc; | |
391 | } | |
392 | ||
393 | /* | |
394 | * Add a devmap for the device specified by busid. It is possible that | |
395 | * the devmap already exists (dasd= parameter). The order of the devices | |
396 | * added through this function will define the kdevs for the individual | |
138c014d | 397 | * devices. |
1da177e4 LT |
398 | */ |
399 | static struct dasd_devmap * | |
69f90f6a | 400 | dasd_add_busid(const char *bus_id, int features) |
1da177e4 LT |
401 | { |
402 | struct dasd_devmap *devmap, *new, *tmp; | |
403 | int hash; | |
404 | ||
405 | new = (struct dasd_devmap *) | |
138c014d | 406 | kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); |
1da177e4 LT |
407 | if (!new) |
408 | return ERR_PTR(-ENOMEM); | |
409 | spin_lock(&dasd_devmap_lock); | |
d2c993d8 | 410 | devmap = NULL; |
1da177e4 LT |
411 | hash = dasd_hash_busid(bus_id); |
412 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) | |
98df67b3 | 413 | if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { |
1da177e4 LT |
414 | devmap = tmp; |
415 | break; | |
416 | } | |
417 | if (!devmap) { | |
418 | /* This bus_id is new. */ | |
419 | new->devindex = dasd_max_devindex++; | |
98df67b3 | 420 | strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); |
1da177e4 | 421 | new->features = features; |
d2c993d8 | 422 | new->device = NULL; |
1da177e4 LT |
423 | list_add(&new->list, &dasd_hashlists[hash]); |
424 | devmap = new; | |
d2c993d8 | 425 | new = NULL; |
1da177e4 LT |
426 | } |
427 | spin_unlock(&dasd_devmap_lock); | |
17fd682e | 428 | kfree(new); |
1da177e4 LT |
429 | return devmap; |
430 | } | |
431 | ||
432 | /* | |
433 | * Find devmap for device with given bus_id. | |
434 | */ | |
435 | static struct dasd_devmap * | |
69f90f6a | 436 | dasd_find_busid(const char *bus_id) |
1da177e4 LT |
437 | { |
438 | struct dasd_devmap *devmap, *tmp; | |
439 | int hash; | |
440 | ||
441 | spin_lock(&dasd_devmap_lock); | |
442 | devmap = ERR_PTR(-ENODEV); | |
443 | hash = dasd_hash_busid(bus_id); | |
444 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) { | |
98df67b3 | 445 | if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { |
1da177e4 LT |
446 | devmap = tmp; |
447 | break; | |
448 | } | |
449 | } | |
450 | spin_unlock(&dasd_devmap_lock); | |
451 | return devmap; | |
452 | } | |
453 | ||
454 | /* | |
455 | * Check if busid has been added to the list of dasd ranges. | |
456 | */ | |
457 | int | |
69f90f6a | 458 | dasd_busid_known(const char *bus_id) |
1da177e4 LT |
459 | { |
460 | return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; | |
461 | } | |
462 | ||
463 | /* | |
464 | * Forget all about the device numbers added so far. | |
465 | * This may only be called at module unload or system shutdown. | |
466 | */ | |
467 | static void | |
468 | dasd_forget_ranges(void) | |
469 | { | |
470 | struct dasd_devmap *devmap, *n; | |
471 | int i; | |
472 | ||
473 | spin_lock(&dasd_devmap_lock); | |
474 | for (i = 0; i < 256; i++) { | |
475 | list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { | |
606f4422 | 476 | BUG_ON(devmap->device != NULL); |
1da177e4 LT |
477 | list_del(&devmap->list); |
478 | kfree(devmap); | |
479 | } | |
480 | } | |
481 | spin_unlock(&dasd_devmap_lock); | |
482 | } | |
483 | ||
484 | /* | |
485 | * Find the device struct by its device index. | |
486 | */ | |
487 | struct dasd_device * | |
488 | dasd_device_from_devindex(int devindex) | |
489 | { | |
490 | struct dasd_devmap *devmap, *tmp; | |
491 | struct dasd_device *device; | |
492 | int i; | |
493 | ||
494 | spin_lock(&dasd_devmap_lock); | |
d2c993d8 | 495 | devmap = NULL; |
1da177e4 LT |
496 | for (i = 0; (i < 256) && !devmap; i++) |
497 | list_for_each_entry(tmp, &dasd_hashlists[i], list) | |
498 | if (tmp->devindex == devindex) { | |
499 | /* Found the devmap for the device. */ | |
500 | devmap = tmp; | |
501 | break; | |
502 | } | |
503 | if (devmap && devmap->device) { | |
504 | device = devmap->device; | |
505 | dasd_get_device(device); | |
506 | } else | |
507 | device = ERR_PTR(-ENODEV); | |
508 | spin_unlock(&dasd_devmap_lock); | |
509 | return device; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Return devmap for cdev. If no devmap exists yet, create one and | |
514 | * connect it to the cdev. | |
515 | */ | |
516 | static struct dasd_devmap * | |
517 | dasd_devmap_from_cdev(struct ccw_device *cdev) | |
518 | { | |
519 | struct dasd_devmap *devmap; | |
520 | ||
2a0217d5 | 521 | devmap = dasd_find_busid(dev_name(&cdev->dev)); |
1da177e4 | 522 | if (IS_ERR(devmap)) |
2a0217d5 | 523 | devmap = dasd_add_busid(dev_name(&cdev->dev), |
1da177e4 LT |
524 | DASD_FEATURE_DEFAULT); |
525 | return devmap; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Create a dasd device structure for cdev. | |
530 | */ | |
531 | struct dasd_device * | |
532 | dasd_create_device(struct ccw_device *cdev) | |
533 | { | |
534 | struct dasd_devmap *devmap; | |
535 | struct dasd_device *device; | |
a00bfd71 | 536 | unsigned long flags; |
1da177e4 LT |
537 | int rc; |
538 | ||
539 | devmap = dasd_devmap_from_cdev(cdev); | |
540 | if (IS_ERR(devmap)) | |
541 | return (void *) devmap; | |
1da177e4 LT |
542 | |
543 | device = dasd_alloc_device(); | |
544 | if (IS_ERR(device)) | |
545 | return device; | |
a00bfd71 | 546 | atomic_set(&device->ref_count, 3); |
1da177e4 LT |
547 | |
548 | spin_lock(&dasd_devmap_lock); | |
549 | if (!devmap->device) { | |
550 | devmap->device = device; | |
551 | device->devindex = devmap->devindex; | |
c6eb7b77 | 552 | device->features = devmap->features; |
1da177e4 LT |
553 | get_device(&cdev->dev); |
554 | device->cdev = cdev; | |
555 | rc = 0; | |
556 | } else | |
557 | /* Someone else was faster. */ | |
558 | rc = -EBUSY; | |
559 | spin_unlock(&dasd_devmap_lock); | |
560 | ||
561 | if (rc) { | |
562 | dasd_free_device(device); | |
563 | return ERR_PTR(rc); | |
564 | } | |
a00bfd71 MS |
565 | |
566 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
faf16aa9 | 567 | dev_set_drvdata(&cdev->dev, device); |
a00bfd71 MS |
568 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
569 | ||
1da177e4 LT |
570 | return device; |
571 | } | |
572 | ||
573 | /* | |
574 | * Wait queue for dasd_delete_device waits. | |
575 | */ | |
576 | static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); | |
577 | ||
578 | /* | |
579 | * Remove a dasd device structure. The passed referenced | |
580 | * is destroyed. | |
581 | */ | |
582 | void | |
583 | dasd_delete_device(struct dasd_device *device) | |
584 | { | |
585 | struct ccw_device *cdev; | |
586 | struct dasd_devmap *devmap; | |
a00bfd71 | 587 | unsigned long flags; |
1da177e4 LT |
588 | |
589 | /* First remove device pointer from devmap. */ | |
2a0217d5 | 590 | devmap = dasd_find_busid(dev_name(&device->cdev->dev)); |
606f4422 | 591 | BUG_ON(IS_ERR(devmap)); |
1da177e4 LT |
592 | spin_lock(&dasd_devmap_lock); |
593 | if (devmap->device != device) { | |
594 | spin_unlock(&dasd_devmap_lock); | |
595 | dasd_put_device(device); | |
596 | return; | |
597 | } | |
598 | devmap->device = NULL; | |
599 | spin_unlock(&dasd_devmap_lock); | |
600 | ||
a00bfd71 MS |
601 | /* Disconnect dasd_device structure from ccw_device structure. */ |
602 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
faf16aa9 | 603 | dev_set_drvdata(&device->cdev->dev, NULL); |
a00bfd71 MS |
604 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
605 | ||
606 | /* | |
607 | * Drop ref_count by 3, one for the devmap reference, one for | |
608 | * the cdev reference and one for the passed reference. | |
609 | */ | |
610 | atomic_sub(3, &device->ref_count); | |
1da177e4 LT |
611 | |
612 | /* Wait for reference counter to drop to zero. */ | |
613 | wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); | |
614 | ||
615 | /* Disconnect dasd_device structure from ccw_device structure. */ | |
616 | cdev = device->cdev; | |
617 | device->cdev = NULL; | |
618 | ||
1da177e4 LT |
619 | /* Put ccw_device structure. */ |
620 | put_device(&cdev->dev); | |
621 | ||
622 | /* Now the device structure can be freed. */ | |
623 | dasd_free_device(device); | |
624 | } | |
625 | ||
626 | /* | |
627 | * Reference counter dropped to zero. Wake up waiter | |
628 | * in dasd_delete_device. | |
629 | */ | |
630 | void | |
631 | dasd_put_device_wake(struct dasd_device *device) | |
632 | { | |
633 | wake_up(&dasd_delete_wq); | |
634 | } | |
635 | ||
a00bfd71 MS |
636 | /* |
637 | * Return dasd_device structure associated with cdev. | |
638 | * This function needs to be called with the ccw device | |
639 | * lock held. It can be used from interrupt context. | |
640 | */ | |
641 | struct dasd_device * | |
642 | dasd_device_from_cdev_locked(struct ccw_device *cdev) | |
643 | { | |
faf16aa9 | 644 | struct dasd_device *device = dev_get_drvdata(&cdev->dev); |
a00bfd71 MS |
645 | |
646 | if (!device) | |
647 | return ERR_PTR(-ENODEV); | |
648 | dasd_get_device(device); | |
649 | return device; | |
650 | } | |
651 | ||
1da177e4 LT |
652 | /* |
653 | * Return dasd_device structure associated with cdev. | |
654 | */ | |
655 | struct dasd_device * | |
656 | dasd_device_from_cdev(struct ccw_device *cdev) | |
657 | { | |
1da177e4 | 658 | struct dasd_device *device; |
a00bfd71 | 659 | unsigned long flags; |
1da177e4 | 660 | |
a00bfd71 MS |
661 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
662 | device = dasd_device_from_cdev_locked(cdev); | |
663 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
1da177e4 LT |
664 | return device; |
665 | } | |
666 | ||
667 | /* | |
668 | * SECTION: files in sysfs | |
669 | */ | |
670 | ||
13de227b HS |
671 | /* |
672 | * failfast controls the behaviour, if no path is available | |
673 | */ | |
674 | static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr, | |
675 | char *buf) | |
676 | { | |
677 | struct dasd_devmap *devmap; | |
678 | int ff_flag; | |
679 | ||
ca0b4b7d | 680 | devmap = dasd_find_busid(dev_name(dev)); |
13de227b HS |
681 | if (!IS_ERR(devmap)) |
682 | ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0; | |
683 | else | |
684 | ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0; | |
685 | return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n"); | |
686 | } | |
687 | ||
688 | static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr, | |
689 | const char *buf, size_t count) | |
690 | { | |
691 | struct dasd_devmap *devmap; | |
692 | int val; | |
693 | char *endp; | |
694 | ||
695 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
696 | if (IS_ERR(devmap)) | |
697 | return PTR_ERR(devmap); | |
698 | ||
699 | val = simple_strtoul(buf, &endp, 0); | |
700 | if (((endp + 1) < (buf + count)) || (val > 1)) | |
701 | return -EINVAL; | |
702 | ||
703 | spin_lock(&dasd_devmap_lock); | |
704 | if (val) | |
705 | devmap->features |= DASD_FEATURE_FAILFAST; | |
706 | else | |
707 | devmap->features &= ~DASD_FEATURE_FAILFAST; | |
708 | if (devmap->device) | |
709 | devmap->device->features = devmap->features; | |
710 | spin_unlock(&dasd_devmap_lock); | |
711 | return count; | |
712 | } | |
713 | ||
714 | static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store); | |
715 | ||
1da177e4 LT |
716 | /* |
717 | * readonly controls the readonly status of a dasd | |
718 | */ | |
719 | static ssize_t | |
e404e274 | 720 | dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
721 | { |
722 | struct dasd_devmap *devmap; | |
723 | int ro_flag; | |
724 | ||
2a0217d5 | 725 | devmap = dasd_find_busid(dev_name(dev)); |
1da177e4 LT |
726 | if (!IS_ERR(devmap)) |
727 | ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0; | |
728 | else | |
729 | ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0; | |
730 | return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); | |
731 | } | |
732 | ||
733 | static ssize_t | |
138c014d HH |
734 | dasd_ro_store(struct device *dev, struct device_attribute *attr, |
735 | const char *buf, size_t count) | |
1da177e4 LT |
736 | { |
737 | struct dasd_devmap *devmap; | |
01376f44 HH |
738 | int val; |
739 | char *endp; | |
1da177e4 LT |
740 | |
741 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
742 | if (IS_ERR(devmap)) | |
743 | return PTR_ERR(devmap); | |
01376f44 HH |
744 | |
745 | val = simple_strtoul(buf, &endp, 0); | |
746 | if (((endp + 1) < (buf + count)) || (val > 1)) | |
747 | return -EINVAL; | |
748 | ||
1da177e4 | 749 | spin_lock(&dasd_devmap_lock); |
01376f44 | 750 | if (val) |
1da177e4 LT |
751 | devmap->features |= DASD_FEATURE_READONLY; |
752 | else | |
753 | devmap->features &= ~DASD_FEATURE_READONLY; | |
c6eb7b77 HH |
754 | if (devmap->device) |
755 | devmap->device->features = devmap->features; | |
8e09f215 SW |
756 | if (devmap->device && devmap->device->block |
757 | && devmap->device->block->gdp) | |
758 | set_disk_ro(devmap->device->block->gdp, val); | |
1da177e4 LT |
759 | spin_unlock(&dasd_devmap_lock); |
760 | return count; | |
761 | } | |
762 | ||
763 | static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); | |
9575bf26 HH |
764 | /* |
765 | * erplog controls the logging of ERP related data | |
766 | * (e.g. failing channel programs). | |
767 | */ | |
768 | static ssize_t | |
769 | dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) | |
770 | { | |
771 | struct dasd_devmap *devmap; | |
772 | int erplog; | |
773 | ||
2a0217d5 | 774 | devmap = dasd_find_busid(dev_name(dev)); |
9575bf26 HH |
775 | if (!IS_ERR(devmap)) |
776 | erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; | |
777 | else | |
778 | erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; | |
779 | return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n"); | |
780 | } | |
781 | ||
782 | static ssize_t | |
783 | dasd_erplog_store(struct device *dev, struct device_attribute *attr, | |
784 | const char *buf, size_t count) | |
785 | { | |
786 | struct dasd_devmap *devmap; | |
787 | int val; | |
788 | char *endp; | |
789 | ||
790 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
791 | if (IS_ERR(devmap)) | |
792 | return PTR_ERR(devmap); | |
793 | ||
794 | val = simple_strtoul(buf, &endp, 0); | |
795 | if (((endp + 1) < (buf + count)) || (val > 1)) | |
796 | return -EINVAL; | |
797 | ||
798 | spin_lock(&dasd_devmap_lock); | |
799 | if (val) | |
800 | devmap->features |= DASD_FEATURE_ERPLOG; | |
801 | else | |
802 | devmap->features &= ~DASD_FEATURE_ERPLOG; | |
803 | if (devmap->device) | |
804 | devmap->device->features = devmap->features; | |
805 | spin_unlock(&dasd_devmap_lock); | |
806 | return count; | |
807 | } | |
808 | ||
809 | static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store); | |
1da177e4 LT |
810 | |
811 | /* | |
812 | * use_diag controls whether the driver should use diag rather than ssch | |
813 | * to talk to the device | |
814 | */ | |
138c014d | 815 | static ssize_t |
e404e274 | 816 | dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
817 | { |
818 | struct dasd_devmap *devmap; | |
819 | int use_diag; | |
820 | ||
2a0217d5 | 821 | devmap = dasd_find_busid(dev_name(dev)); |
1da177e4 LT |
822 | if (!IS_ERR(devmap)) |
823 | use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; | |
824 | else | |
825 | use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; | |
826 | return sprintf(buf, use_diag ? "1\n" : "0\n"); | |
827 | } | |
828 | ||
829 | static ssize_t | |
138c014d HH |
830 | dasd_use_diag_store(struct device *dev, struct device_attribute *attr, |
831 | const char *buf, size_t count) | |
1da177e4 LT |
832 | { |
833 | struct dasd_devmap *devmap; | |
834 | ssize_t rc; | |
01376f44 HH |
835 | int val; |
836 | char *endp; | |
1da177e4 LT |
837 | |
838 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
839 | if (IS_ERR(devmap)) | |
840 | return PTR_ERR(devmap); | |
01376f44 HH |
841 | |
842 | val = simple_strtoul(buf, &endp, 0); | |
843 | if (((endp + 1) < (buf + count)) || (val > 1)) | |
844 | return -EINVAL; | |
845 | ||
1da177e4 LT |
846 | spin_lock(&dasd_devmap_lock); |
847 | /* Changing diag discipline flag is only allowed in offline state. */ | |
848 | rc = count; | |
849 | if (!devmap->device) { | |
01376f44 | 850 | if (val) |
1da177e4 LT |
851 | devmap->features |= DASD_FEATURE_USEDIAG; |
852 | else | |
853 | devmap->features &= ~DASD_FEATURE_USEDIAG; | |
854 | } else | |
855 | rc = -EPERM; | |
856 | spin_unlock(&dasd_devmap_lock); | |
857 | return rc; | |
858 | } | |
859 | ||
138c014d | 860 | static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); |
1da177e4 LT |
861 | |
862 | static ssize_t | |
138c014d HH |
863 | dasd_discipline_show(struct device *dev, struct device_attribute *attr, |
864 | char *buf) | |
1da177e4 | 865 | { |
a00bfd71 MS |
866 | struct dasd_device *device; |
867 | ssize_t len; | |
1da177e4 | 868 | |
a00bfd71 MS |
869 | device = dasd_device_from_cdev(to_ccwdev(dev)); |
870 | if (!IS_ERR(device) && device->discipline) { | |
871 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
872 | device->discipline->name); | |
873 | dasd_put_device(device); | |
874 | } else | |
875 | len = snprintf(buf, PAGE_SIZE, "none\n"); | |
876 | return len; | |
1da177e4 LT |
877 | } |
878 | ||
879 | static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); | |
880 | ||
4dfd5c45 HH |
881 | static ssize_t |
882 | dasd_device_status_show(struct device *dev, struct device_attribute *attr, | |
883 | char *buf) | |
884 | { | |
885 | struct dasd_device *device; | |
886 | ssize_t len; | |
887 | ||
888 | device = dasd_device_from_cdev(to_ccwdev(dev)); | |
889 | if (!IS_ERR(device)) { | |
890 | switch (device->state) { | |
891 | case DASD_STATE_NEW: | |
892 | len = snprintf(buf, PAGE_SIZE, "new\n"); | |
893 | break; | |
894 | case DASD_STATE_KNOWN: | |
895 | len = snprintf(buf, PAGE_SIZE, "detected\n"); | |
896 | break; | |
897 | case DASD_STATE_BASIC: | |
898 | len = snprintf(buf, PAGE_SIZE, "basic\n"); | |
899 | break; | |
900 | case DASD_STATE_UNFMT: | |
901 | len = snprintf(buf, PAGE_SIZE, "unformatted\n"); | |
902 | break; | |
903 | case DASD_STATE_READY: | |
904 | len = snprintf(buf, PAGE_SIZE, "ready\n"); | |
905 | break; | |
906 | case DASD_STATE_ONLINE: | |
907 | len = snprintf(buf, PAGE_SIZE, "online\n"); | |
908 | break; | |
909 | default: | |
910 | len = snprintf(buf, PAGE_SIZE, "no stat\n"); | |
911 | break; | |
912 | } | |
913 | dasd_put_device(device); | |
914 | } else | |
915 | len = snprintf(buf, PAGE_SIZE, "unknown\n"); | |
916 | return len; | |
917 | } | |
918 | ||
919 | static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL); | |
920 | ||
3d052595 HH |
921 | static ssize_t |
922 | dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf) | |
923 | { | |
924 | struct dasd_devmap *devmap; | |
925 | int alias; | |
926 | ||
2a0217d5 | 927 | devmap = dasd_find_busid(dev_name(dev)); |
3d052595 | 928 | spin_lock(&dasd_devmap_lock); |
8e09f215 SW |
929 | if (IS_ERR(devmap) || strlen(devmap->uid.vendor) == 0) { |
930 | spin_unlock(&dasd_devmap_lock); | |
931 | return sprintf(buf, "0\n"); | |
932 | } | |
933 | if (devmap->uid.type == UA_BASE_PAV_ALIAS || | |
934 | devmap->uid.type == UA_HYPER_PAV_ALIAS) | |
935 | alias = 1; | |
3d052595 HH |
936 | else |
937 | alias = 0; | |
938 | spin_unlock(&dasd_devmap_lock); | |
3d052595 HH |
939 | return sprintf(buf, alias ? "1\n" : "0\n"); |
940 | } | |
941 | ||
942 | static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); | |
943 | ||
944 | static ssize_t | |
945 | dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf) | |
946 | { | |
947 | struct dasd_devmap *devmap; | |
948 | char *vendor; | |
949 | ||
2a0217d5 | 950 | devmap = dasd_find_busid(dev_name(dev)); |
3d052595 HH |
951 | spin_lock(&dasd_devmap_lock); |
952 | if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) | |
953 | vendor = devmap->uid.vendor; | |
954 | else | |
955 | vendor = ""; | |
956 | spin_unlock(&dasd_devmap_lock); | |
957 | ||
958 | return snprintf(buf, PAGE_SIZE, "%s\n", vendor); | |
959 | } | |
960 | ||
961 | static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); | |
962 | ||
963 | #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ | |
4abb08c2 SW |
964 | /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\ |
965 | /* vduit */ 32 + 1) | |
3d052595 HH |
966 | |
967 | static ssize_t | |
968 | dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
969 | { | |
970 | struct dasd_devmap *devmap; | |
8e09f215 SW |
971 | char uid_string[UID_STRLEN]; |
972 | char ua_string[3]; | |
973 | struct dasd_uid *uid; | |
3d052595 | 974 | |
2a0217d5 | 975 | devmap = dasd_find_busid(dev_name(dev)); |
3d052595 | 976 | spin_lock(&dasd_devmap_lock); |
8e09f215 SW |
977 | if (IS_ERR(devmap) || strlen(devmap->uid.vendor) == 0) { |
978 | spin_unlock(&dasd_devmap_lock); | |
979 | return sprintf(buf, "\n"); | |
980 | } | |
981 | uid = &devmap->uid; | |
982 | switch (uid->type) { | |
983 | case UA_BASE_DEVICE: | |
984 | sprintf(ua_string, "%02x", uid->real_unit_addr); | |
985 | break; | |
986 | case UA_BASE_PAV_ALIAS: | |
987 | sprintf(ua_string, "%02x", uid->base_unit_addr); | |
988 | break; | |
989 | case UA_HYPER_PAV_ALIAS: | |
990 | sprintf(ua_string, "xx"); | |
991 | break; | |
992 | default: | |
993 | /* should not happen, treat like base device */ | |
994 | sprintf(ua_string, "%02x", uid->real_unit_addr); | |
995 | break; | |
996 | } | |
4abb08c2 SW |
997 | if (strlen(uid->vduit) > 0) |
998 | snprintf(uid_string, sizeof(uid_string), | |
999 | "%s.%s.%04x.%s.%s", | |
1000 | uid->vendor, uid->serial, | |
1001 | uid->ssid, ua_string, | |
1002 | uid->vduit); | |
1003 | else | |
1004 | snprintf(uid_string, sizeof(uid_string), | |
1005 | "%s.%s.%04x.%s", | |
1006 | uid->vendor, uid->serial, | |
1007 | uid->ssid, ua_string); | |
3d052595 | 1008 | spin_unlock(&dasd_devmap_lock); |
8e09f215 | 1009 | return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); |
3d052595 HH |
1010 | } |
1011 | ||
1012 | static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); | |
1013 | ||
20c64468 SW |
1014 | /* |
1015 | * extended error-reporting | |
1016 | */ | |
1017 | static ssize_t | |
1018 | dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1019 | { | |
1020 | struct dasd_devmap *devmap; | |
1021 | int eer_flag; | |
1022 | ||
2a0217d5 | 1023 | devmap = dasd_find_busid(dev_name(dev)); |
20c64468 SW |
1024 | if (!IS_ERR(devmap) && devmap->device) |
1025 | eer_flag = dasd_eer_enabled(devmap->device); | |
1026 | else | |
1027 | eer_flag = 0; | |
1028 | return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); | |
1029 | } | |
1030 | ||
1031 | static ssize_t | |
1032 | dasd_eer_store(struct device *dev, struct device_attribute *attr, | |
1033 | const char *buf, size_t count) | |
1034 | { | |
1035 | struct dasd_devmap *devmap; | |
01376f44 HH |
1036 | int val, rc; |
1037 | char *endp; | |
20c64468 SW |
1038 | |
1039 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); | |
1040 | if (IS_ERR(devmap)) | |
1041 | return PTR_ERR(devmap); | |
1042 | if (!devmap->device) | |
01376f44 HH |
1043 | return -ENODEV; |
1044 | ||
1045 | val = simple_strtoul(buf, &endp, 0); | |
1046 | if (((endp + 1) < (buf + count)) || (val > 1)) | |
1047 | return -EINVAL; | |
1048 | ||
645c98c8 | 1049 | if (val) { |
20c64468 | 1050 | rc = dasd_eer_enable(devmap->device); |
645c98c8 HH |
1051 | if (rc) |
1052 | return rc; | |
1053 | } else | |
20c64468 | 1054 | dasd_eer_disable(devmap->device); |
645c98c8 | 1055 | return count; |
20c64468 SW |
1056 | } |
1057 | ||
1058 | static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); | |
1059 | ||
1da177e4 LT |
1060 | static struct attribute * dasd_attrs[] = { |
1061 | &dev_attr_readonly.attr, | |
1062 | &dev_attr_discipline.attr, | |
4dfd5c45 | 1063 | &dev_attr_status.attr, |
3d052595 HH |
1064 | &dev_attr_alias.attr, |
1065 | &dev_attr_vendor.attr, | |
1066 | &dev_attr_uid.attr, | |
1da177e4 | 1067 | &dev_attr_use_diag.attr, |
20c64468 | 1068 | &dev_attr_eer_enabled.attr, |
9575bf26 | 1069 | &dev_attr_erplog.attr, |
13de227b | 1070 | &dev_attr_failfast.attr, |
1da177e4 LT |
1071 | NULL, |
1072 | }; | |
1073 | ||
1074 | static struct attribute_group dasd_attr_group = { | |
1075 | .attrs = dasd_attrs, | |
1076 | }; | |
1077 | ||
3d052595 HH |
1078 | /* |
1079 | * Return copy of the device unique identifier. | |
1080 | */ | |
1081 | int | |
1082 | dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid) | |
1083 | { | |
1084 | struct dasd_devmap *devmap; | |
1085 | ||
2a0217d5 | 1086 | devmap = dasd_find_busid(dev_name(&cdev->dev)); |
3d052595 HH |
1087 | if (IS_ERR(devmap)) |
1088 | return PTR_ERR(devmap); | |
1089 | spin_lock(&dasd_devmap_lock); | |
1090 | *uid = devmap->uid; | |
1091 | spin_unlock(&dasd_devmap_lock); | |
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * Register the given device unique identifier into devmap struct. | |
b18a60e7 PO |
1097 | * In addition check if the related storage server subsystem ID is already |
1098 | * contained in the dasd_server_ssid_list. If subsystem ID is not contained, | |
1099 | * create new entry. | |
40545573 HH |
1100 | * Return 0 if server was already in serverlist, |
1101 | * 1 if the server was added successful | |
1102 | * <0 in case of error. | |
3d052595 HH |
1103 | */ |
1104 | int | |
1105 | dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid) | |
1106 | { | |
1107 | struct dasd_devmap *devmap; | |
1108 | ||
2a0217d5 | 1109 | devmap = dasd_find_busid(dev_name(&cdev->dev)); |
3d052595 HH |
1110 | if (IS_ERR(devmap)) |
1111 | return PTR_ERR(devmap); | |
d0710c7c | 1112 | |
3d052595 HH |
1113 | spin_lock(&dasd_devmap_lock); |
1114 | devmap->uid = *uid; | |
1115 | spin_unlock(&dasd_devmap_lock); | |
d0710c7c | 1116 | |
8e09f215 | 1117 | return 0; |
3d052595 | 1118 | } |
40545573 | 1119 | EXPORT_SYMBOL_GPL(dasd_set_uid); |
3d052595 | 1120 | |
f24acd45 HH |
1121 | /* |
1122 | * Return value of the specified feature. | |
1123 | */ | |
1124 | int | |
1125 | dasd_get_feature(struct ccw_device *cdev, int feature) | |
1126 | { | |
1127 | struct dasd_devmap *devmap; | |
1128 | ||
2a0217d5 | 1129 | devmap = dasd_find_busid(dev_name(&cdev->dev)); |
f24acd45 | 1130 | if (IS_ERR(devmap)) |
40545573 | 1131 | return PTR_ERR(devmap); |
f24acd45 HH |
1132 | |
1133 | return ((devmap->features & feature) != 0); | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Set / reset given feature. | |
1138 | * Flag indicates wether to set (!=0) or the reset (=0) the feature. | |
1139 | */ | |
1140 | int | |
1141 | dasd_set_feature(struct ccw_device *cdev, int feature, int flag) | |
1142 | { | |
1143 | struct dasd_devmap *devmap; | |
1144 | ||
2a0217d5 | 1145 | devmap = dasd_find_busid(dev_name(&cdev->dev)); |
f24acd45 | 1146 | if (IS_ERR(devmap)) |
40545573 | 1147 | return PTR_ERR(devmap); |
f24acd45 HH |
1148 | |
1149 | spin_lock(&dasd_devmap_lock); | |
1150 | if (flag) | |
1151 | devmap->features |= feature; | |
1152 | else | |
1153 | devmap->features &= ~feature; | |
c6eb7b77 HH |
1154 | if (devmap->device) |
1155 | devmap->device->features = devmap->features; | |
f24acd45 HH |
1156 | spin_unlock(&dasd_devmap_lock); |
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | ||
1da177e4 LT |
1161 | int |
1162 | dasd_add_sysfs_files(struct ccw_device *cdev) | |
1163 | { | |
1164 | return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group); | |
1165 | } | |
1166 | ||
1167 | void | |
1168 | dasd_remove_sysfs_files(struct ccw_device *cdev) | |
1169 | { | |
1170 | sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group); | |
1171 | } | |
1172 | ||
1173 | ||
1174 | int | |
1175 | dasd_devmap_init(void) | |
1176 | { | |
1177 | int i; | |
1178 | ||
1179 | /* Initialize devmap structures. */ | |
1180 | dasd_max_devindex = 0; | |
1181 | for (i = 0; i < 256; i++) | |
1182 | INIT_LIST_HEAD(&dasd_hashlists[i]); | |
40545573 | 1183 | return 0; |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | void | |
1187 | dasd_devmap_exit(void) | |
1188 | { | |
1189 | dasd_forget_ranges(); | |
1190 | } |