Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * dcssblk.c -- the S/390 block driver for dcss memory | |
3 | * | |
4 | * Authors: Carsten Otte, Stefan Weinhuber, Gerald Schaefer | |
5 | */ | |
6 | ||
93098bf0 HY |
7 | #define KMSG_COMPONENT "dcssblk" |
8 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/moduleparam.h> | |
12 | #include <linux/ctype.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/blkdev.h> | |
1da177e4 LT |
17 | #include <linux/completion.h> |
18 | #include <linux/interrupt.h> | |
c369527f GS |
19 | #include <linux/platform_device.h> |
20 | #include <asm/extmem.h> | |
21 | #include <asm/io.h> | |
1da177e4 | 22 | |
1da177e4 LT |
23 | #define DCSSBLK_NAME "dcssblk" |
24 | #define DCSSBLK_MINORS_PER_DISK 1 | |
25 | #define DCSSBLK_PARM_LEN 400 | |
98df67b3 | 26 | #define DCSS_BUS_ID_SIZE 20 |
1da177e4 | 27 | |
46d74326 | 28 | static int dcssblk_open(struct block_device *bdev, fmode_t mode); |
db2a144b | 29 | static void dcssblk_release(struct gendisk *disk, fmode_t mode); |
dece1635 JA |
30 | static blk_qc_t dcssblk_make_request(struct request_queue *q, |
31 | struct bio *bio); | |
dd22f551 | 32 | static long dcssblk_direct_access(struct block_device *bdev, sector_t secnum, |
cb389b9c | 33 | void __pmem **kaddr, unsigned long *pfn); |
1da177e4 LT |
34 | |
35 | static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; | |
36 | ||
37 | static int dcssblk_major; | |
83d5cde4 | 38 | static const struct block_device_operations dcssblk_devops = { |
420edbcc | 39 | .owner = THIS_MODULE, |
46d74326 AV |
40 | .open = dcssblk_open, |
41 | .release = dcssblk_release, | |
420edbcc | 42 | .direct_access = dcssblk_direct_access, |
1da177e4 LT |
43 | }; |
44 | ||
b2300b9e HY |
45 | struct dcssblk_dev_info { |
46 | struct list_head lh; | |
47 | struct device dev; | |
98df67b3 | 48 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
49 | atomic_t use_count; |
50 | struct gendisk *gd; | |
51 | unsigned long start; | |
52 | unsigned long end; | |
53 | int segment_type; | |
54 | unsigned char save_pending; | |
55 | unsigned char is_shared; | |
56 | struct request_queue *dcssblk_queue; | |
57 | int num_of_segments; | |
58 | struct list_head seg_list; | |
59 | }; | |
60 | ||
61 | struct segment_info { | |
62 | struct list_head lh; | |
98df67b3 | 63 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
64 | unsigned long start; |
65 | unsigned long end; | |
66 | int segment_type; | |
67 | }; | |
68 | ||
e404e274 | 69 | static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 70 | size_t count); |
e404e274 | 71 | static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 72 | size_t count); |
1da177e4 LT |
73 | |
74 | static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); | |
75 | static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); | |
1da177e4 LT |
76 | |
77 | static struct device *dcssblk_root_dev; | |
78 | ||
c11ca97e | 79 | static LIST_HEAD(dcssblk_devices); |
1da177e4 LT |
80 | static struct rw_semaphore dcssblk_devices_sem; |
81 | ||
82 | /* | |
83 | * release function for segment device. | |
84 | */ | |
85 | static void | |
86 | dcssblk_release_segment(struct device *dev) | |
87 | { | |
b2300b9e HY |
88 | struct dcssblk_dev_info *dev_info; |
89 | struct segment_info *entry, *temp; | |
90 | ||
91 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
92 | list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { | |
93 | list_del(&entry->lh); | |
94 | kfree(entry); | |
95 | } | |
96 | kfree(dev_info); | |
1da177e4 LT |
97 | module_put(THIS_MODULE); |
98 | } | |
99 | ||
100 | /* | |
101 | * get a minor number. needs to be called with | |
102 | * down_write(&dcssblk_devices_sem) and the | |
103 | * device needs to be enqueued before the semaphore is | |
104 | * freed. | |
105 | */ | |
4d284cac | 106 | static int |
1da177e4 LT |
107 | dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) |
108 | { | |
109 | int minor, found; | |
110 | struct dcssblk_dev_info *entry; | |
111 | ||
112 | if (dev_info == NULL) | |
113 | return -EINVAL; | |
114 | for (minor = 0; minor < (1<<MINORBITS); minor++) { | |
115 | found = 0; | |
116 | // test if minor available | |
117 | list_for_each_entry(entry, &dcssblk_devices, lh) | |
d0591485 | 118 | if (minor == entry->gd->first_minor) |
1da177e4 LT |
119 | found++; |
120 | if (!found) break; // got unused minor | |
121 | } | |
122 | if (found) | |
123 | return -EBUSY; | |
124 | dev_info->gd->first_minor = minor; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* | |
129 | * get the struct dcssblk_dev_info from dcssblk_devices | |
130 | * for the given name. | |
131 | * down_read(&dcssblk_devices_sem) must be held. | |
132 | */ | |
133 | static struct dcssblk_dev_info * | |
134 | dcssblk_get_device_by_name(char *name) | |
135 | { | |
136 | struct dcssblk_dev_info *entry; | |
137 | ||
138 | list_for_each_entry(entry, &dcssblk_devices, lh) { | |
139 | if (!strcmp(name, entry->segment_name)) { | |
140 | return entry; | |
141 | } | |
142 | } | |
143 | return NULL; | |
144 | } | |
145 | ||
b2300b9e HY |
146 | /* |
147 | * get the struct segment_info from seg_list | |
148 | * for the given name. | |
149 | * down_read(&dcssblk_devices_sem) must be held. | |
150 | */ | |
151 | static struct segment_info * | |
152 | dcssblk_get_segment_by_name(char *name) | |
153 | { | |
154 | struct dcssblk_dev_info *dev_info; | |
155 | struct segment_info *entry; | |
156 | ||
157 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
158 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
159 | if (!strcmp(name, entry->segment_name)) | |
160 | return entry; | |
161 | } | |
162 | } | |
163 | return NULL; | |
164 | } | |
165 | ||
166 | /* | |
167 | * get the highest address of the multi-segment block. | |
168 | */ | |
169 | static unsigned long | |
170 | dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) | |
171 | { | |
172 | unsigned long highest_addr; | |
173 | struct segment_info *entry; | |
174 | ||
175 | highest_addr = 0; | |
176 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
177 | if (highest_addr < entry->end) | |
178 | highest_addr = entry->end; | |
179 | } | |
180 | return highest_addr; | |
181 | } | |
182 | ||
183 | /* | |
184 | * get the lowest address of the multi-segment block. | |
185 | */ | |
186 | static unsigned long | |
187 | dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) | |
188 | { | |
189 | int set_first; | |
190 | unsigned long lowest_addr; | |
191 | struct segment_info *entry; | |
192 | ||
193 | set_first = 0; | |
194 | lowest_addr = 0; | |
195 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
196 | if (set_first == 0) { | |
197 | lowest_addr = entry->start; | |
198 | set_first = 1; | |
199 | } else { | |
200 | if (lowest_addr > entry->start) | |
201 | lowest_addr = entry->start; | |
202 | } | |
203 | } | |
204 | return lowest_addr; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Check continuity of segments. | |
209 | */ | |
210 | static int | |
211 | dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) | |
212 | { | |
213 | int i, j, rc; | |
214 | struct segment_info *sort_list, *entry, temp; | |
215 | ||
216 | if (dev_info->num_of_segments <= 1) | |
217 | return 0; | |
218 | ||
219 | sort_list = kzalloc( | |
220 | sizeof(struct segment_info) * dev_info->num_of_segments, | |
221 | GFP_KERNEL); | |
222 | if (sort_list == NULL) | |
223 | return -ENOMEM; | |
224 | i = 0; | |
225 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
226 | memcpy(&sort_list[i], entry, sizeof(struct segment_info)); | |
227 | i++; | |
228 | } | |
229 | ||
230 | /* sort segments */ | |
231 | for (i = 0; i < dev_info->num_of_segments; i++) | |
232 | for (j = 0; j < dev_info->num_of_segments; j++) | |
233 | if (sort_list[j].start > sort_list[i].start) { | |
234 | memcpy(&temp, &sort_list[i], | |
235 | sizeof(struct segment_info)); | |
236 | memcpy(&sort_list[i], &sort_list[j], | |
237 | sizeof(struct segment_info)); | |
238 | memcpy(&sort_list[j], &temp, | |
239 | sizeof(struct segment_info)); | |
240 | } | |
241 | ||
242 | /* check continuity */ | |
243 | for (i = 0; i < dev_info->num_of_segments - 1; i++) { | |
244 | if ((sort_list[i].end + 1) != sort_list[i+1].start) { | |
93098bf0 HY |
245 | pr_err("Adjacent DCSSs %s and %s are not " |
246 | "contiguous\n", sort_list[i].segment_name, | |
247 | sort_list[i+1].segment_name); | |
b2300b9e HY |
248 | rc = -EINVAL; |
249 | goto out; | |
250 | } | |
251 | /* EN and EW are allowed in a block device */ | |
252 | if (sort_list[i].segment_type != sort_list[i+1].segment_type) { | |
253 | if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || | |
254 | (sort_list[i].segment_type == SEG_TYPE_ER) || | |
255 | !(sort_list[i+1].segment_type & | |
256 | SEGMENT_EXCLUSIVE) || | |
257 | (sort_list[i+1].segment_type == SEG_TYPE_ER)) { | |
93098bf0 HY |
258 | pr_err("DCSS %s and DCSS %s have " |
259 | "incompatible types\n", | |
260 | sort_list[i].segment_name, | |
261 | sort_list[i+1].segment_name); | |
b2300b9e HY |
262 | rc = -EINVAL; |
263 | goto out; | |
264 | } | |
265 | } | |
266 | } | |
267 | rc = 0; | |
268 | out: | |
269 | kfree(sort_list); | |
270 | return rc; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Load a segment | |
275 | */ | |
276 | static int | |
277 | dcssblk_load_segment(char *name, struct segment_info **seg_info) | |
278 | { | |
279 | int rc; | |
280 | ||
281 | /* already loaded? */ | |
282 | down_read(&dcssblk_devices_sem); | |
283 | *seg_info = dcssblk_get_segment_by_name(name); | |
284 | up_read(&dcssblk_devices_sem); | |
285 | if (*seg_info != NULL) | |
286 | return -EEXIST; | |
287 | ||
288 | /* get a struct segment_info */ | |
289 | *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); | |
290 | if (*seg_info == NULL) | |
291 | return -ENOMEM; | |
292 | ||
293 | strcpy((*seg_info)->segment_name, name); | |
294 | ||
295 | /* load the segment */ | |
296 | rc = segment_load(name, SEGMENT_SHARED, | |
297 | &(*seg_info)->start, &(*seg_info)->end); | |
298 | if (rc < 0) { | |
299 | segment_warning(rc, (*seg_info)->segment_name); | |
300 | kfree(*seg_info); | |
301 | } else { | |
302 | INIT_LIST_HEAD(&(*seg_info)->lh); | |
303 | (*seg_info)->segment_type = rc; | |
304 | } | |
305 | return rc; | |
306 | } | |
307 | ||
1da177e4 LT |
308 | /* |
309 | * device attribute for switching shared/nonshared (exclusive) | |
310 | * operation (show + store) | |
311 | */ | |
312 | static ssize_t | |
e404e274 | 313 | dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
314 | { |
315 | struct dcssblk_dev_info *dev_info; | |
316 | ||
317 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
318 | return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); | |
319 | } | |
320 | ||
321 | static ssize_t | |
e404e274 | 322 | dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
323 | { |
324 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 325 | struct segment_info *entry, *temp; |
1da177e4 LT |
326 | int rc; |
327 | ||
ded77fb4 | 328 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 329 | return -EINVAL; |
1da177e4 LT |
330 | down_write(&dcssblk_devices_sem); |
331 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
332 | if (atomic_read(&dev_info->use_count)) { | |
1da177e4 LT |
333 | rc = -EBUSY; |
334 | goto out; | |
335 | } | |
336 | if (inbuf[0] == '1') { | |
b2300b9e HY |
337 | /* reload segments in shared mode */ |
338 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
339 | rc = segment_modify_shared(entry->segment_name, | |
340 | SEGMENT_SHARED); | |
341 | if (rc < 0) { | |
342 | BUG_ON(rc == -EINVAL); | |
343 | if (rc != -EAGAIN) | |
344 | goto removeseg; | |
1da177e4 LT |
345 | } |
346 | } | |
b2300b9e HY |
347 | dev_info->is_shared = 1; |
348 | switch (dev_info->segment_type) { | |
349 | case SEG_TYPE_SR: | |
350 | case SEG_TYPE_ER: | |
351 | case SEG_TYPE_SC: | |
352 | set_disk_ro(dev_info->gd, 1); | |
353 | } | |
1da177e4 | 354 | } else if (inbuf[0] == '0') { |
b2300b9e | 355 | /* reload segments in exclusive mode */ |
1da177e4 | 356 | if (dev_info->segment_type == SEG_TYPE_SC) { |
93098bf0 HY |
357 | pr_err("DCSS %s is of type SC and cannot be " |
358 | "loaded as exclusive-writable\n", | |
359 | dev_info->segment_name); | |
1da177e4 LT |
360 | rc = -EINVAL; |
361 | goto out; | |
362 | } | |
b2300b9e HY |
363 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
364 | rc = segment_modify_shared(entry->segment_name, | |
365 | SEGMENT_EXCLUSIVE); | |
366 | if (rc < 0) { | |
367 | BUG_ON(rc == -EINVAL); | |
368 | if (rc != -EAGAIN) | |
369 | goto removeseg; | |
370 | } | |
1da177e4 | 371 | } |
b2300b9e HY |
372 | dev_info->is_shared = 0; |
373 | set_disk_ro(dev_info->gd, 0); | |
1da177e4 | 374 | } else { |
1da177e4 LT |
375 | rc = -EINVAL; |
376 | goto out; | |
377 | } | |
378 | rc = count; | |
379 | goto out; | |
380 | ||
381 | removeseg: | |
93098bf0 HY |
382 | pr_err("DCSS device %s is removed after a failed access mode " |
383 | "change\n", dev_info->segment_name); | |
b2300b9e HY |
384 | temp = entry; |
385 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
386 | if (entry != temp) | |
387 | segment_unload(entry->segment_name); | |
388 | } | |
1da177e4 LT |
389 | list_del(&dev_info->lh); |
390 | ||
391 | del_gendisk(dev_info->gd); | |
1312f40e | 392 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
393 | dev_info->gd->queue = NULL; |
394 | put_disk(dev_info->gd); | |
0b60f9ea TH |
395 | up_write(&dcssblk_devices_sem); |
396 | ||
397 | if (device_remove_file_self(dev, attr)) { | |
398 | device_unregister(dev); | |
399 | put_device(dev); | |
400 | } | |
401 | return rc; | |
1da177e4 LT |
402 | out: |
403 | up_write(&dcssblk_devices_sem); | |
404 | return rc; | |
405 | } | |
521b3d79 SO |
406 | static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, |
407 | dcssblk_shared_store); | |
1da177e4 LT |
408 | |
409 | /* | |
410 | * device attribute for save operation on current copy | |
411 | * of the segment. If the segment is busy, saving will | |
412 | * become pending until it gets released, which can be | |
413 | * undone by storing a non-true value to this entry. | |
414 | * (show + store) | |
415 | */ | |
416 | static ssize_t | |
e404e274 | 417 | dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
418 | { |
419 | struct dcssblk_dev_info *dev_info; | |
420 | ||
421 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
422 | return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); | |
423 | } | |
424 | ||
425 | static ssize_t | |
e404e274 | 426 | dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
427 | { |
428 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 429 | struct segment_info *entry; |
1da177e4 | 430 | |
ded77fb4 | 431 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 432 | return -EINVAL; |
1da177e4 LT |
433 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
434 | ||
435 | down_write(&dcssblk_devices_sem); | |
436 | if (inbuf[0] == '1') { | |
437 | if (atomic_read(&dev_info->use_count) == 0) { | |
438 | // device is idle => we save immediately | |
93098bf0 HY |
439 | pr_info("All DCSSs that map to device %s are " |
440 | "saved\n", dev_info->segment_name); | |
b2300b9e | 441 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
442 | if (entry->segment_type == SEG_TYPE_EN || |
443 | entry->segment_type == SEG_TYPE_SN) | |
444 | pr_warn("DCSS %s is of type SN or EN" | |
445 | " and cannot be saved\n", | |
446 | entry->segment_name); | |
447 | else | |
448 | segment_save(entry->segment_name); | |
b2300b9e | 449 | } |
1da177e4 LT |
450 | } else { |
451 | // device is busy => we save it when it becomes | |
452 | // idle in dcssblk_release | |
93098bf0 HY |
453 | pr_info("Device %s is in use, its DCSSs will be " |
454 | "saved when it becomes idle\n", | |
455 | dev_info->segment_name); | |
1da177e4 LT |
456 | dev_info->save_pending = 1; |
457 | } | |
458 | } else if (inbuf[0] == '0') { | |
459 | if (dev_info->save_pending) { | |
460 | // device is busy & the user wants to undo his save | |
461 | // request | |
462 | dev_info->save_pending = 0; | |
93098bf0 HY |
463 | pr_info("A pending save request for device %s " |
464 | "has been canceled\n", | |
465 | dev_info->segment_name); | |
1da177e4 LT |
466 | } |
467 | } else { | |
468 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
469 | return -EINVAL; |
470 | } | |
471 | up_write(&dcssblk_devices_sem); | |
472 | return count; | |
473 | } | |
521b3d79 SO |
474 | static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, |
475 | dcssblk_save_store); | |
1da177e4 | 476 | |
b2300b9e HY |
477 | /* |
478 | * device attribute for showing all segments in a device | |
479 | */ | |
480 | static ssize_t | |
481 | dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, | |
482 | char *buf) | |
483 | { | |
484 | int i; | |
485 | ||
486 | struct dcssblk_dev_info *dev_info; | |
487 | struct segment_info *entry; | |
488 | ||
489 | down_read(&dcssblk_devices_sem); | |
490 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
491 | i = 0; | |
492 | buf[0] = '\0'; | |
493 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
494 | strcpy(&buf[i], entry->segment_name); | |
495 | i += strlen(entry->segment_name); | |
496 | buf[i] = '\n'; | |
497 | i++; | |
498 | } | |
499 | up_read(&dcssblk_devices_sem); | |
500 | return i; | |
501 | } | |
521b3d79 SO |
502 | static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); |
503 | ||
504 | static struct attribute *dcssblk_dev_attrs[] = { | |
505 | &dev_attr_shared.attr, | |
506 | &dev_attr_save.attr, | |
507 | &dev_attr_seglist.attr, | |
508 | NULL, | |
509 | }; | |
510 | static struct attribute_group dcssblk_dev_attr_group = { | |
511 | .attrs = dcssblk_dev_attrs, | |
512 | }; | |
513 | static const struct attribute_group *dcssblk_dev_attr_groups[] = { | |
514 | &dcssblk_dev_attr_group, | |
515 | NULL, | |
516 | }; | |
b2300b9e | 517 | |
1da177e4 LT |
518 | /* |
519 | * device attribute for adding devices | |
520 | */ | |
521 | static ssize_t | |
e404e274 | 522 | dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 523 | { |
b2300b9e | 524 | int rc, i, j, num_of_segments; |
1da177e4 | 525 | struct dcssblk_dev_info *dev_info; |
b2300b9e | 526 | struct segment_info *seg_info, *temp; |
1da177e4 LT |
527 | char *local_buf; |
528 | unsigned long seg_byte_size; | |
529 | ||
530 | dev_info = NULL; | |
b2300b9e | 531 | seg_info = NULL; |
1da177e4 LT |
532 | if (dev != dcssblk_root_dev) { |
533 | rc = -EINVAL; | |
534 | goto out_nobuf; | |
535 | } | |
b2300b9e HY |
536 | if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { |
537 | rc = -ENAMETOOLONG; | |
538 | goto out_nobuf; | |
539 | } | |
540 | ||
1da177e4 LT |
541 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
542 | if (local_buf == NULL) { | |
543 | rc = -ENOMEM; | |
544 | goto out_nobuf; | |
545 | } | |
b2300b9e | 546 | |
1da177e4 LT |
547 | /* |
548 | * parse input | |
549 | */ | |
b2300b9e | 550 | num_of_segments = 0; |
3a9f9183 | 551 | for (i = 0; (i < count && (buf[i] != '\0') && (buf[i] != '\n')); i++) { |
42cfc6b5 MS |
552 | for (j = i; j < count && |
553 | (buf[j] != ':') && | |
b2300b9e | 554 | (buf[j] != '\0') && |
42cfc6b5 | 555 | (buf[j] != '\n'); j++) { |
b2300b9e HY |
556 | local_buf[j-i] = toupper(buf[j]); |
557 | } | |
558 | local_buf[j-i] = '\0'; | |
559 | if (((j - i) == 0) || ((j - i) > 8)) { | |
560 | rc = -ENAMETOOLONG; | |
561 | goto seg_list_del; | |
562 | } | |
563 | ||
564 | rc = dcssblk_load_segment(local_buf, &seg_info); | |
565 | if (rc < 0) | |
566 | goto seg_list_del; | |
567 | /* | |
568 | * get a struct dcssblk_dev_info | |
569 | */ | |
570 | if (num_of_segments == 0) { | |
571 | dev_info = kzalloc(sizeof(struct dcssblk_dev_info), | |
572 | GFP_KERNEL); | |
573 | if (dev_info == NULL) { | |
574 | rc = -ENOMEM; | |
575 | goto out; | |
576 | } | |
577 | strcpy(dev_info->segment_name, local_buf); | |
578 | dev_info->segment_type = seg_info->segment_type; | |
579 | INIT_LIST_HEAD(&dev_info->seg_list); | |
580 | } | |
581 | list_add_tail(&seg_info->lh, &dev_info->seg_list); | |
582 | num_of_segments++; | |
583 | i = j; | |
584 | ||
585 | if ((buf[j] == '\0') || (buf[j] == '\n')) | |
586 | break; | |
1da177e4 | 587 | } |
b2300b9e HY |
588 | |
589 | /* no trailing colon at the end of the input */ | |
590 | if ((i > 0) && (buf[i-1] == ':')) { | |
1da177e4 | 591 | rc = -ENAMETOOLONG; |
b2300b9e | 592 | goto seg_list_del; |
1da177e4 | 593 | } |
b2300b9e HY |
594 | strlcpy(local_buf, buf, i + 1); |
595 | dev_info->num_of_segments = num_of_segments; | |
596 | rc = dcssblk_is_continuous(dev_info); | |
597 | if (rc < 0) | |
598 | goto seg_list_del; | |
599 | ||
600 | dev_info->start = dcssblk_find_lowest_addr(dev_info); | |
601 | dev_info->end = dcssblk_find_highest_addr(dev_info); | |
1da177e4 | 602 | |
ef283688 | 603 | dev_set_name(&dev_info->dev, "%s", dev_info->segment_name); |
1da177e4 | 604 | dev_info->dev.release = dcssblk_release_segment; |
521b3d79 | 605 | dev_info->dev.groups = dcssblk_dev_attr_groups; |
1da177e4 | 606 | INIT_LIST_HEAD(&dev_info->lh); |
1da177e4 LT |
607 | dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); |
608 | if (dev_info->gd == NULL) { | |
609 | rc = -ENOMEM; | |
b2300b9e | 610 | goto seg_list_del; |
1da177e4 LT |
611 | } |
612 | dev_info->gd->major = dcssblk_major; | |
613 | dev_info->gd->fops = &dcssblk_devops; | |
614 | dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); | |
615 | dev_info->gd->queue = dev_info->dcssblk_queue; | |
616 | dev_info->gd->private_data = dev_info; | |
617 | dev_info->gd->driverfs_dev = &dev_info->dev; | |
c5411dba | 618 | blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); |
e1defc4f | 619 | blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); |
b2300b9e | 620 | |
1da177e4 LT |
621 | seg_byte_size = (dev_info->end - dev_info->start + 1); |
622 | set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors | |
93098bf0 HY |
623 | pr_info("Loaded %s with total size %lu bytes and capacity %lu " |
624 | "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); | |
1da177e4 | 625 | |
1da177e4 LT |
626 | dev_info->save_pending = 0; |
627 | dev_info->is_shared = 1; | |
628 | dev_info->dev.parent = dcssblk_root_dev; | |
629 | ||
630 | /* | |
b2300b9e | 631 | *get minor, add to list |
1da177e4 LT |
632 | */ |
633 | down_write(&dcssblk_devices_sem); | |
b2300b9e | 634 | if (dcssblk_get_segment_by_name(local_buf)) { |
04f64b57 | 635 | rc = -EEXIST; |
b2300b9e | 636 | goto release_gd; |
04f64b57 | 637 | } |
1da177e4 | 638 | rc = dcssblk_assign_free_minor(dev_info); |
b2300b9e HY |
639 | if (rc) |
640 | goto release_gd; | |
1da177e4 | 641 | sprintf(dev_info->gd->disk_name, "dcssblk%d", |
d0591485 | 642 | dev_info->gd->first_minor); |
1da177e4 LT |
643 | list_add_tail(&dev_info->lh, &dcssblk_devices); |
644 | ||
645 | if (!try_module_get(THIS_MODULE)) { | |
646 | rc = -ENODEV; | |
b2300b9e | 647 | goto dev_list_del; |
1da177e4 LT |
648 | } |
649 | /* | |
650 | * register the device | |
651 | */ | |
652 | rc = device_register(&dev_info->dev); | |
b2300b9e | 653 | if (rc) |
521b3d79 | 654 | goto put_dev; |
1da177e4 | 655 | |
521b3d79 | 656 | get_device(&dev_info->dev); |
436d1bc7 CB |
657 | add_disk(dev_info->gd); |
658 | ||
1da177e4 LT |
659 | switch (dev_info->segment_type) { |
660 | case SEG_TYPE_SR: | |
661 | case SEG_TYPE_ER: | |
662 | case SEG_TYPE_SC: | |
663 | set_disk_ro(dev_info->gd,1); | |
664 | break; | |
665 | default: | |
666 | set_disk_ro(dev_info->gd,0); | |
667 | break; | |
668 | } | |
1da177e4 LT |
669 | up_write(&dcssblk_devices_sem); |
670 | rc = count; | |
671 | goto out; | |
672 | ||
521b3d79 | 673 | put_dev: |
1da177e4 | 674 | list_del(&dev_info->lh); |
1312f40e | 675 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
676 | dev_info->gd->queue = NULL; |
677 | put_disk(dev_info->gd); | |
b2300b9e HY |
678 | list_for_each_entry(seg_info, &dev_info->seg_list, lh) { |
679 | segment_unload(seg_info->segment_name); | |
680 | } | |
1da177e4 LT |
681 | put_device(&dev_info->dev); |
682 | up_write(&dcssblk_devices_sem); | |
683 | goto out; | |
b2300b9e | 684 | dev_list_del: |
1da177e4 | 685 | list_del(&dev_info->lh); |
b2300b9e | 686 | release_gd: |
1312f40e | 687 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
688 | dev_info->gd->queue = NULL; |
689 | put_disk(dev_info->gd); | |
b2300b9e HY |
690 | up_write(&dcssblk_devices_sem); |
691 | seg_list_del: | |
692 | if (dev_info == NULL) | |
693 | goto out; | |
694 | list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) { | |
695 | list_del(&seg_info->lh); | |
696 | segment_unload(seg_info->segment_name); | |
697 | kfree(seg_info); | |
698 | } | |
1da177e4 LT |
699 | kfree(dev_info); |
700 | out: | |
701 | kfree(local_buf); | |
702 | out_nobuf: | |
703 | return rc; | |
704 | } | |
705 | ||
706 | /* | |
707 | * device attribute for removing devices | |
708 | */ | |
709 | static ssize_t | |
e404e274 | 710 | dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
711 | { |
712 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 713 | struct segment_info *entry; |
1da177e4 LT |
714 | int rc, i; |
715 | char *local_buf; | |
716 | ||
717 | if (dev != dcssblk_root_dev) { | |
718 | return -EINVAL; | |
719 | } | |
720 | local_buf = kmalloc(count + 1, GFP_KERNEL); | |
721 | if (local_buf == NULL) { | |
722 | return -ENOMEM; | |
723 | } | |
724 | /* | |
725 | * parse input | |
726 | */ | |
42cfc6b5 | 727 | for (i = 0; (i < count && (*(buf+i)!='\0') && (*(buf+i)!='\n')); i++) { |
1da177e4 LT |
728 | local_buf[i] = toupper(buf[i]); |
729 | } | |
730 | local_buf[i] = '\0'; | |
731 | if ((i == 0) || (i > 8)) { | |
732 | rc = -ENAMETOOLONG; | |
733 | goto out_buf; | |
734 | } | |
735 | ||
736 | down_write(&dcssblk_devices_sem); | |
737 | dev_info = dcssblk_get_device_by_name(local_buf); | |
738 | if (dev_info == NULL) { | |
739 | up_write(&dcssblk_devices_sem); | |
93098bf0 HY |
740 | pr_warning("Device %s cannot be removed because it is not a " |
741 | "known device\n", local_buf); | |
1da177e4 LT |
742 | rc = -ENODEV; |
743 | goto out_buf; | |
744 | } | |
745 | if (atomic_read(&dev_info->use_count) != 0) { | |
746 | up_write(&dcssblk_devices_sem); | |
93098bf0 HY |
747 | pr_warning("Device %s cannot be removed while it is in " |
748 | "use\n", local_buf); | |
1da177e4 LT |
749 | rc = -EBUSY; |
750 | goto out_buf; | |
751 | } | |
1da177e4 | 752 | |
b2300b9e | 753 | list_del(&dev_info->lh); |
1da177e4 | 754 | del_gendisk(dev_info->gd); |
1312f40e | 755 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
756 | dev_info->gd->queue = NULL; |
757 | put_disk(dev_info->gd); | |
758 | device_unregister(&dev_info->dev); | |
b2300b9e HY |
759 | |
760 | /* unload all related segments */ | |
761 | list_for_each_entry(entry, &dev_info->seg_list, lh) | |
762 | segment_unload(entry->segment_name); | |
763 | ||
1da177e4 LT |
764 | put_device(&dev_info->dev); |
765 | up_write(&dcssblk_devices_sem); | |
766 | ||
767 | rc = count; | |
768 | out_buf: | |
769 | kfree(local_buf); | |
770 | return rc; | |
771 | } | |
772 | ||
773 | static int | |
46d74326 | 774 | dcssblk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
775 | { |
776 | struct dcssblk_dev_info *dev_info; | |
777 | int rc; | |
778 | ||
46d74326 | 779 | dev_info = bdev->bd_disk->private_data; |
1da177e4 LT |
780 | if (NULL == dev_info) { |
781 | rc = -ENODEV; | |
782 | goto out; | |
783 | } | |
784 | atomic_inc(&dev_info->use_count); | |
46d74326 | 785 | bdev->bd_block_size = 4096; |
1da177e4 LT |
786 | rc = 0; |
787 | out: | |
788 | return rc; | |
789 | } | |
790 | ||
db2a144b | 791 | static void |
46d74326 | 792 | dcssblk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 793 | { |
46d74326 | 794 | struct dcssblk_dev_info *dev_info = disk->private_data; |
b2300b9e | 795 | struct segment_info *entry; |
1da177e4 | 796 | |
46d74326 | 797 | if (!dev_info) { |
db2a144b AV |
798 | WARN_ON(1); |
799 | return; | |
1da177e4 LT |
800 | } |
801 | down_write(&dcssblk_devices_sem); | |
802 | if (atomic_dec_and_test(&dev_info->use_count) | |
803 | && (dev_info->save_pending)) { | |
93098bf0 HY |
804 | pr_info("Device %s has become idle and is being saved " |
805 | "now\n", dev_info->segment_name); | |
b2300b9e | 806 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
807 | if (entry->segment_type == SEG_TYPE_EN || |
808 | entry->segment_type == SEG_TYPE_SN) | |
809 | pr_warn("DCSS %s is of type SN or EN and cannot" | |
810 | " be saved\n", entry->segment_name); | |
811 | else | |
812 | segment_save(entry->segment_name); | |
b2300b9e | 813 | } |
1da177e4 LT |
814 | dev_info->save_pending = 0; |
815 | } | |
816 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
817 | } |
818 | ||
dece1635 | 819 | static blk_qc_t |
165125e1 | 820 | dcssblk_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
821 | { |
822 | struct dcssblk_dev_info *dev_info; | |
7988613b KO |
823 | struct bio_vec bvec; |
824 | struct bvec_iter iter; | |
1da177e4 LT |
825 | unsigned long index; |
826 | unsigned long page_addr; | |
827 | unsigned long source_addr; | |
828 | unsigned long bytes_done; | |
1da177e4 | 829 | |
54efd50b KO |
830 | blk_queue_split(q, &bio, q->bio_split); |
831 | ||
1da177e4 LT |
832 | bytes_done = 0; |
833 | dev_info = bio->bi_bdev->bd_disk->private_data; | |
834 | if (dev_info == NULL) | |
835 | goto fail; | |
4f024f37 KO |
836 | if ((bio->bi_iter.bi_sector & 7) != 0 || |
837 | (bio->bi_iter.bi_size & 4095) != 0) | |
1da177e4 LT |
838 | /* Request is not page-aligned. */ |
839 | goto fail; | |
f73a1c7d | 840 | if (bio_end_sector(bio) > get_capacity(bio->bi_bdev->bd_disk)) { |
1da177e4 LT |
841 | /* Request beyond end of DCSS segment. */ |
842 | goto fail; | |
843 | } | |
420edbcc CO |
844 | /* verify data transfer direction */ |
845 | if (dev_info->is_shared) { | |
846 | switch (dev_info->segment_type) { | |
847 | case SEG_TYPE_SR: | |
848 | case SEG_TYPE_ER: | |
849 | case SEG_TYPE_SC: | |
850 | /* cannot write to these segments */ | |
851 | if (bio_data_dir(bio) == WRITE) { | |
93098bf0 HY |
852 | pr_warning("Writing to %s failed because it " |
853 | "is a read-only device\n", | |
2a0217d5 | 854 | dev_name(&dev_info->dev)); |
420edbcc CO |
855 | goto fail; |
856 | } | |
857 | } | |
858 | } | |
859 | ||
4f024f37 | 860 | index = (bio->bi_iter.bi_sector >> 3); |
7988613b | 861 | bio_for_each_segment(bvec, bio, iter) { |
1da177e4 | 862 | page_addr = (unsigned long) |
7988613b | 863 | page_address(bvec.bv_page) + bvec.bv_offset; |
1da177e4 | 864 | source_addr = dev_info->start + (index<<12) + bytes_done; |
7988613b | 865 | if (unlikely((page_addr & 4095) != 0) || (bvec.bv_len & 4095) != 0) |
1da177e4 LT |
866 | // More paranoia. |
867 | goto fail; | |
868 | if (bio_data_dir(bio) == READ) { | |
869 | memcpy((void*)page_addr, (void*)source_addr, | |
7988613b | 870 | bvec.bv_len); |
1da177e4 LT |
871 | } else { |
872 | memcpy((void*)source_addr, (void*)page_addr, | |
7988613b | 873 | bvec.bv_len); |
1da177e4 | 874 | } |
7988613b | 875 | bytes_done += bvec.bv_len; |
1da177e4 | 876 | } |
4246a0b6 | 877 | bio_endio(bio); |
dece1635 | 878 | return BLK_QC_T_NONE; |
1da177e4 | 879 | fail: |
6712ecf8 | 880 | bio_io_error(bio); |
dece1635 | 881 | return BLK_QC_T_NONE; |
420edbcc CO |
882 | } |
883 | ||
dd22f551 | 884 | static long |
420edbcc | 885 | dcssblk_direct_access (struct block_device *bdev, sector_t secnum, |
cb389b9c | 886 | void __pmem **kaddr, unsigned long *pfn) |
420edbcc CO |
887 | { |
888 | struct dcssblk_dev_info *dev_info; | |
dd22f551 | 889 | unsigned long offset, dev_sz; |
e2e05394 | 890 | void *addr; |
420edbcc CO |
891 | |
892 | dev_info = bdev->bd_disk->private_data; | |
893 | if (!dev_info) | |
894 | return -ENODEV; | |
dd22f551 MW |
895 | dev_sz = dev_info->end - dev_info->start; |
896 | offset = secnum * 512; | |
e2e05394 RZ |
897 | addr = (void *) (dev_info->start + offset); |
898 | *pfn = virt_to_phys(addr) >> PAGE_SHIFT; | |
899 | *kaddr = (void __pmem *) addr; | |
30afcb4b | 900 | |
dd22f551 | 901 | return dev_sz - offset; |
1da177e4 LT |
902 | } |
903 | ||
904 | static void | |
905 | dcssblk_check_params(void) | |
906 | { | |
907 | int rc, i, j, k; | |
b2300b9e | 908 | char buf[DCSSBLK_PARM_LEN + 1]; |
1da177e4 LT |
909 | struct dcssblk_dev_info *dev_info; |
910 | ||
911 | for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); | |
912 | i++) { | |
42cfc6b5 MS |
913 | for (j = i; (j < DCSSBLK_PARM_LEN) && |
914 | (dcssblk_segments[j] != ',') && | |
1da177e4 | 915 | (dcssblk_segments[j] != '\0') && |
42cfc6b5 | 916 | (dcssblk_segments[j] != '('); j++) |
1da177e4 LT |
917 | { |
918 | buf[j-i] = dcssblk_segments[j]; | |
919 | } | |
920 | buf[j-i] = '\0'; | |
f901e5d1 | 921 | rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); |
1da177e4 | 922 | if ((rc >= 0) && (dcssblk_segments[j] == '(')) { |
b2300b9e | 923 | for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) |
1da177e4 | 924 | buf[k] = toupper(buf[k]); |
b2300b9e | 925 | buf[k] = '\0'; |
1da177e4 LT |
926 | if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { |
927 | down_read(&dcssblk_devices_sem); | |
928 | dev_info = dcssblk_get_device_by_name(buf); | |
929 | up_read(&dcssblk_devices_sem); | |
930 | if (dev_info) | |
931 | dcssblk_shared_store(&dev_info->dev, | |
f901e5d1 | 932 | NULL, "0\n", 2); |
1da177e4 LT |
933 | } |
934 | } | |
935 | while ((dcssblk_segments[j] != ',') && | |
936 | (dcssblk_segments[j] != '\0')) | |
937 | { | |
938 | j++; | |
939 | } | |
940 | if (dcssblk_segments[j] == '\0') | |
941 | break; | |
942 | i = j; | |
943 | } | |
944 | } | |
945 | ||
c369527f GS |
946 | /* |
947 | * Suspend / Resume | |
948 | */ | |
949 | static int dcssblk_freeze(struct device *dev) | |
950 | { | |
951 | struct dcssblk_dev_info *dev_info; | |
952 | int rc = 0; | |
953 | ||
954 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
955 | switch (dev_info->segment_type) { | |
956 | case SEG_TYPE_SR: | |
957 | case SEG_TYPE_ER: | |
958 | case SEG_TYPE_SC: | |
959 | if (!dev_info->is_shared) | |
960 | rc = -EINVAL; | |
961 | break; | |
962 | default: | |
963 | rc = -EINVAL; | |
964 | break; | |
965 | } | |
966 | if (rc) | |
967 | break; | |
968 | } | |
969 | if (rc) | |
2c48c4d6 CB |
970 | pr_err("Suspending the system failed because DCSS device %s " |
971 | "is writable\n", | |
c369527f GS |
972 | dev_info->segment_name); |
973 | return rc; | |
974 | } | |
975 | ||
976 | static int dcssblk_restore(struct device *dev) | |
977 | { | |
978 | struct dcssblk_dev_info *dev_info; | |
979 | struct segment_info *entry; | |
980 | unsigned long start, end; | |
981 | int rc = 0; | |
982 | ||
983 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
984 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
985 | segment_unload(entry->segment_name); | |
986 | rc = segment_load(entry->segment_name, SEGMENT_SHARED, | |
987 | &start, &end); | |
988 | if (rc < 0) { | |
989 | // TODO in_use check ? | |
990 | segment_warning(rc, entry->segment_name); | |
991 | goto out_panic; | |
992 | } | |
993 | if (start != entry->start || end != entry->end) { | |
2c48c4d6 CB |
994 | pr_err("The address range of DCSS %s changed " |
995 | "while the system was suspended\n", | |
c369527f GS |
996 | entry->segment_name); |
997 | goto out_panic; | |
998 | } | |
999 | } | |
1000 | } | |
1001 | return 0; | |
1002 | out_panic: | |
1003 | panic("fatal dcssblk resume error\n"); | |
1004 | } | |
1005 | ||
1006 | static int dcssblk_thaw(struct device *dev) | |
1007 | { | |
1008 | return 0; | |
1009 | } | |
1010 | ||
47145210 | 1011 | static const struct dev_pm_ops dcssblk_pm_ops = { |
c369527f GS |
1012 | .freeze = dcssblk_freeze, |
1013 | .thaw = dcssblk_thaw, | |
1014 | .restore = dcssblk_restore, | |
1015 | }; | |
1016 | ||
1017 | static struct platform_driver dcssblk_pdrv = { | |
1018 | .driver = { | |
1019 | .name = "dcssblk", | |
c369527f GS |
1020 | .pm = &dcssblk_pm_ops, |
1021 | }, | |
1022 | }; | |
1023 | ||
1024 | static struct platform_device *dcssblk_pdev; | |
1025 | ||
1026 | ||
1da177e4 LT |
1027 | /* |
1028 | * The init/exit functions. | |
1029 | */ | |
1030 | static void __exit | |
1031 | dcssblk_exit(void) | |
1032 | { | |
c369527f GS |
1033 | platform_device_unregister(dcssblk_pdev); |
1034 | platform_driver_unregister(&dcssblk_pdrv); | |
035da16f | 1035 | root_device_unregister(dcssblk_root_dev); |
00d59405 | 1036 | unregister_blkdev(dcssblk_major, DCSSBLK_NAME); |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | static int __init | |
1040 | dcssblk_init(void) | |
1041 | { | |
1042 | int rc; | |
1043 | ||
c369527f GS |
1044 | rc = platform_driver_register(&dcssblk_pdrv); |
1045 | if (rc) | |
1da177e4 | 1046 | return rc; |
c369527f GS |
1047 | |
1048 | dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL, | |
1049 | 0); | |
1050 | if (IS_ERR(dcssblk_pdev)) { | |
1051 | rc = PTR_ERR(dcssblk_pdev); | |
1052 | goto out_pdrv; | |
1da177e4 | 1053 | } |
c369527f GS |
1054 | |
1055 | dcssblk_root_dev = root_device_register("dcssblk"); | |
1056 | if (IS_ERR(dcssblk_root_dev)) { | |
1057 | rc = PTR_ERR(dcssblk_root_dev); | |
1058 | goto out_pdev; | |
1da177e4 | 1059 | } |
c369527f GS |
1060 | rc = device_create_file(dcssblk_root_dev, &dev_attr_add); |
1061 | if (rc) | |
1062 | goto out_root; | |
1063 | rc = device_create_file(dcssblk_root_dev, &dev_attr_remove); | |
1064 | if (rc) | |
1065 | goto out_root; | |
1da177e4 | 1066 | rc = register_blkdev(0, DCSSBLK_NAME); |
c369527f GS |
1067 | if (rc < 0) |
1068 | goto out_root; | |
1da177e4 LT |
1069 | dcssblk_major = rc; |
1070 | init_rwsem(&dcssblk_devices_sem); | |
1071 | ||
1072 | dcssblk_check_params(); | |
1da177e4 | 1073 | return 0; |
c369527f GS |
1074 | |
1075 | out_root: | |
1076 | root_device_unregister(dcssblk_root_dev); | |
1077 | out_pdev: | |
1078 | platform_device_unregister(dcssblk_pdev); | |
1079 | out_pdrv: | |
1080 | platform_driver_unregister(&dcssblk_pdrv); | |
1081 | return rc; | |
1da177e4 LT |
1082 | } |
1083 | ||
1084 | module_init(dcssblk_init); | |
1085 | module_exit(dcssblk_exit); | |
1086 | ||
1087 | module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); | |
1088 | MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " | |
b2300b9e HY |
1089 | "comma-separated list, names in each set separated " |
1090 | "by commas are separated by colons, each set contains " | |
1091 | "names of contiguous segments and each name max. 8 chars.\n" | |
1092 | "Adding \"(local)\" to the end of each set equals echoing 0 " | |
1093 | "to /sys/devices/dcssblk/<device name>/shared after loading " | |
1094 | "the contiguous segments - \n" | |
1095 | "e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\""); | |
1da177e4 LT |
1096 | |
1097 | MODULE_LICENSE("GPL"); |