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