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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 AV |
28 | static int dcssblk_open(struct block_device *bdev, fmode_t mode); |
29 | static int dcssblk_release(struct gendisk *disk, fmode_t mode); | |
1da177e4 | 30 | static int dcssblk_make_request(struct request_queue *q, struct bio *bio); |
420edbcc | 31 | static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum, |
30afcb4b | 32 | void **kaddr, unsigned long *pfn); |
1da177e4 LT |
33 | |
34 | static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; | |
35 | ||
36 | static int dcssblk_major; | |
83d5cde4 | 37 | static const struct block_device_operations dcssblk_devops = { |
420edbcc | 38 | .owner = THIS_MODULE, |
46d74326 AV |
39 | .open = dcssblk_open, |
40 | .release = dcssblk_release, | |
420edbcc | 41 | .direct_access = dcssblk_direct_access, |
1da177e4 LT |
42 | }; |
43 | ||
b2300b9e HY |
44 | struct dcssblk_dev_info { |
45 | struct list_head lh; | |
46 | struct device dev; | |
98df67b3 | 47 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
48 | atomic_t use_count; |
49 | struct gendisk *gd; | |
50 | unsigned long start; | |
51 | unsigned long end; | |
52 | int segment_type; | |
53 | unsigned char save_pending; | |
54 | unsigned char is_shared; | |
55 | struct request_queue *dcssblk_queue; | |
56 | int num_of_segments; | |
57 | struct list_head seg_list; | |
58 | }; | |
59 | ||
60 | struct segment_info { | |
61 | struct list_head lh; | |
98df67b3 | 62 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
63 | unsigned long start; |
64 | unsigned long end; | |
65 | int segment_type; | |
66 | }; | |
67 | ||
e404e274 | 68 | static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 69 | size_t count); |
e404e274 | 70 | static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 71 | size_t count); |
e404e274 | 72 | static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 73 | size_t count); |
e404e274 YI |
74 | static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf); |
75 | static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf, | |
1da177e4 | 76 | size_t count); |
e404e274 | 77 | static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf); |
b2300b9e HY |
78 | static ssize_t dcssblk_seglist_show(struct device *dev, |
79 | struct device_attribute *attr, | |
80 | char *buf); | |
1da177e4 LT |
81 | |
82 | static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); | |
83 | static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); | |
b2300b9e | 84 | static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, |
1da177e4 | 85 | dcssblk_save_store); |
b2300b9e | 86 | static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, |
1da177e4 | 87 | dcssblk_shared_store); |
b2300b9e | 88 | static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); |
1da177e4 LT |
89 | |
90 | static struct device *dcssblk_root_dev; | |
91 | ||
c11ca97e | 92 | static LIST_HEAD(dcssblk_devices); |
1da177e4 LT |
93 | static struct rw_semaphore dcssblk_devices_sem; |
94 | ||
95 | /* | |
96 | * release function for segment device. | |
97 | */ | |
98 | static void | |
99 | dcssblk_release_segment(struct device *dev) | |
100 | { | |
b2300b9e HY |
101 | struct dcssblk_dev_info *dev_info; |
102 | struct segment_info *entry, *temp; | |
103 | ||
104 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
105 | list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { | |
106 | list_del(&entry->lh); | |
107 | kfree(entry); | |
108 | } | |
109 | kfree(dev_info); | |
1da177e4 LT |
110 | module_put(THIS_MODULE); |
111 | } | |
112 | ||
113 | /* | |
114 | * get a minor number. needs to be called with | |
115 | * down_write(&dcssblk_devices_sem) and the | |
116 | * device needs to be enqueued before the semaphore is | |
117 | * freed. | |
118 | */ | |
4d284cac | 119 | static int |
1da177e4 LT |
120 | dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) |
121 | { | |
122 | int minor, found; | |
123 | struct dcssblk_dev_info *entry; | |
124 | ||
125 | if (dev_info == NULL) | |
126 | return -EINVAL; | |
127 | for (minor = 0; minor < (1<<MINORBITS); minor++) { | |
128 | found = 0; | |
129 | // test if minor available | |
130 | list_for_each_entry(entry, &dcssblk_devices, lh) | |
d0591485 | 131 | if (minor == entry->gd->first_minor) |
1da177e4 LT |
132 | found++; |
133 | if (!found) break; // got unused minor | |
134 | } | |
135 | if (found) | |
136 | return -EBUSY; | |
137 | dev_info->gd->first_minor = minor; | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* | |
142 | * get the struct dcssblk_dev_info from dcssblk_devices | |
143 | * for the given name. | |
144 | * down_read(&dcssblk_devices_sem) must be held. | |
145 | */ | |
146 | static struct dcssblk_dev_info * | |
147 | dcssblk_get_device_by_name(char *name) | |
148 | { | |
149 | struct dcssblk_dev_info *entry; | |
150 | ||
151 | list_for_each_entry(entry, &dcssblk_devices, lh) { | |
152 | if (!strcmp(name, entry->segment_name)) { | |
153 | return entry; | |
154 | } | |
155 | } | |
156 | return NULL; | |
157 | } | |
158 | ||
b2300b9e HY |
159 | /* |
160 | * get the struct segment_info from seg_list | |
161 | * for the given name. | |
162 | * down_read(&dcssblk_devices_sem) must be held. | |
163 | */ | |
164 | static struct segment_info * | |
165 | dcssblk_get_segment_by_name(char *name) | |
166 | { | |
167 | struct dcssblk_dev_info *dev_info; | |
168 | struct segment_info *entry; | |
169 | ||
170 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
171 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
172 | if (!strcmp(name, entry->segment_name)) | |
173 | return entry; | |
174 | } | |
175 | } | |
176 | return NULL; | |
177 | } | |
178 | ||
179 | /* | |
180 | * get the highest address of the multi-segment block. | |
181 | */ | |
182 | static unsigned long | |
183 | dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) | |
184 | { | |
185 | unsigned long highest_addr; | |
186 | struct segment_info *entry; | |
187 | ||
188 | highest_addr = 0; | |
189 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
190 | if (highest_addr < entry->end) | |
191 | highest_addr = entry->end; | |
192 | } | |
193 | return highest_addr; | |
194 | } | |
195 | ||
196 | /* | |
197 | * get the lowest address of the multi-segment block. | |
198 | */ | |
199 | static unsigned long | |
200 | dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) | |
201 | { | |
202 | int set_first; | |
203 | unsigned long lowest_addr; | |
204 | struct segment_info *entry; | |
205 | ||
206 | set_first = 0; | |
207 | lowest_addr = 0; | |
208 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
209 | if (set_first == 0) { | |
210 | lowest_addr = entry->start; | |
211 | set_first = 1; | |
212 | } else { | |
213 | if (lowest_addr > entry->start) | |
214 | lowest_addr = entry->start; | |
215 | } | |
216 | } | |
217 | return lowest_addr; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Check continuity of segments. | |
222 | */ | |
223 | static int | |
224 | dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) | |
225 | { | |
226 | int i, j, rc; | |
227 | struct segment_info *sort_list, *entry, temp; | |
228 | ||
229 | if (dev_info->num_of_segments <= 1) | |
230 | return 0; | |
231 | ||
232 | sort_list = kzalloc( | |
233 | sizeof(struct segment_info) * dev_info->num_of_segments, | |
234 | GFP_KERNEL); | |
235 | if (sort_list == NULL) | |
236 | return -ENOMEM; | |
237 | i = 0; | |
238 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
239 | memcpy(&sort_list[i], entry, sizeof(struct segment_info)); | |
240 | i++; | |
241 | } | |
242 | ||
243 | /* sort segments */ | |
244 | for (i = 0; i < dev_info->num_of_segments; i++) | |
245 | for (j = 0; j < dev_info->num_of_segments; j++) | |
246 | if (sort_list[j].start > sort_list[i].start) { | |
247 | memcpy(&temp, &sort_list[i], | |
248 | sizeof(struct segment_info)); | |
249 | memcpy(&sort_list[i], &sort_list[j], | |
250 | sizeof(struct segment_info)); | |
251 | memcpy(&sort_list[j], &temp, | |
252 | sizeof(struct segment_info)); | |
253 | } | |
254 | ||
255 | /* check continuity */ | |
256 | for (i = 0; i < dev_info->num_of_segments - 1; i++) { | |
257 | if ((sort_list[i].end + 1) != sort_list[i+1].start) { | |
93098bf0 HY |
258 | pr_err("Adjacent DCSSs %s and %s are not " |
259 | "contiguous\n", sort_list[i].segment_name, | |
260 | sort_list[i+1].segment_name); | |
b2300b9e HY |
261 | rc = -EINVAL; |
262 | goto out; | |
263 | } | |
264 | /* EN and EW are allowed in a block device */ | |
265 | if (sort_list[i].segment_type != sort_list[i+1].segment_type) { | |
266 | if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || | |
267 | (sort_list[i].segment_type == SEG_TYPE_ER) || | |
268 | !(sort_list[i+1].segment_type & | |
269 | SEGMENT_EXCLUSIVE) || | |
270 | (sort_list[i+1].segment_type == SEG_TYPE_ER)) { | |
93098bf0 HY |
271 | pr_err("DCSS %s and DCSS %s have " |
272 | "incompatible types\n", | |
273 | sort_list[i].segment_name, | |
274 | sort_list[i+1].segment_name); | |
b2300b9e HY |
275 | rc = -EINVAL; |
276 | goto out; | |
277 | } | |
278 | } | |
279 | } | |
280 | rc = 0; | |
281 | out: | |
282 | kfree(sort_list); | |
283 | return rc; | |
284 | } | |
285 | ||
286 | /* | |
287 | * Load a segment | |
288 | */ | |
289 | static int | |
290 | dcssblk_load_segment(char *name, struct segment_info **seg_info) | |
291 | { | |
292 | int rc; | |
293 | ||
294 | /* already loaded? */ | |
295 | down_read(&dcssblk_devices_sem); | |
296 | *seg_info = dcssblk_get_segment_by_name(name); | |
297 | up_read(&dcssblk_devices_sem); | |
298 | if (*seg_info != NULL) | |
299 | return -EEXIST; | |
300 | ||
301 | /* get a struct segment_info */ | |
302 | *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); | |
303 | if (*seg_info == NULL) | |
304 | return -ENOMEM; | |
305 | ||
306 | strcpy((*seg_info)->segment_name, name); | |
307 | ||
308 | /* load the segment */ | |
309 | rc = segment_load(name, SEGMENT_SHARED, | |
310 | &(*seg_info)->start, &(*seg_info)->end); | |
311 | if (rc < 0) { | |
312 | segment_warning(rc, (*seg_info)->segment_name); | |
313 | kfree(*seg_info); | |
314 | } else { | |
315 | INIT_LIST_HEAD(&(*seg_info)->lh); | |
316 | (*seg_info)->segment_type = rc; | |
317 | } | |
318 | return rc; | |
319 | } | |
320 | ||
931bb68b GS |
321 | static void dcssblk_unregister_callback(struct device *dev) |
322 | { | |
323 | device_unregister(dev); | |
324 | put_device(dev); | |
325 | } | |
326 | ||
1da177e4 LT |
327 | /* |
328 | * device attribute for switching shared/nonshared (exclusive) | |
329 | * operation (show + store) | |
330 | */ | |
331 | static ssize_t | |
e404e274 | 332 | dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
333 | { |
334 | struct dcssblk_dev_info *dev_info; | |
335 | ||
336 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
337 | return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); | |
338 | } | |
339 | ||
340 | static ssize_t | |
e404e274 | 341 | dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
342 | { |
343 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 344 | struct segment_info *entry, *temp; |
1da177e4 LT |
345 | int rc; |
346 | ||
ded77fb4 | 347 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 348 | return -EINVAL; |
1da177e4 LT |
349 | down_write(&dcssblk_devices_sem); |
350 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
351 | if (atomic_read(&dev_info->use_count)) { | |
1da177e4 LT |
352 | rc = -EBUSY; |
353 | goto out; | |
354 | } | |
355 | if (inbuf[0] == '1') { | |
b2300b9e HY |
356 | /* reload segments in shared mode */ |
357 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
358 | rc = segment_modify_shared(entry->segment_name, | |
359 | SEGMENT_SHARED); | |
360 | if (rc < 0) { | |
361 | BUG_ON(rc == -EINVAL); | |
362 | if (rc != -EAGAIN) | |
363 | goto removeseg; | |
1da177e4 LT |
364 | } |
365 | } | |
b2300b9e HY |
366 | dev_info->is_shared = 1; |
367 | switch (dev_info->segment_type) { | |
368 | case SEG_TYPE_SR: | |
369 | case SEG_TYPE_ER: | |
370 | case SEG_TYPE_SC: | |
371 | set_disk_ro(dev_info->gd, 1); | |
372 | } | |
1da177e4 | 373 | } else if (inbuf[0] == '0') { |
b2300b9e | 374 | /* reload segments in exclusive mode */ |
1da177e4 | 375 | if (dev_info->segment_type == SEG_TYPE_SC) { |
93098bf0 HY |
376 | pr_err("DCSS %s is of type SC and cannot be " |
377 | "loaded as exclusive-writable\n", | |
378 | dev_info->segment_name); | |
1da177e4 LT |
379 | rc = -EINVAL; |
380 | goto out; | |
381 | } | |
b2300b9e HY |
382 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
383 | rc = segment_modify_shared(entry->segment_name, | |
384 | SEGMENT_EXCLUSIVE); | |
385 | if (rc < 0) { | |
386 | BUG_ON(rc == -EINVAL); | |
387 | if (rc != -EAGAIN) | |
388 | goto removeseg; | |
389 | } | |
1da177e4 | 390 | } |
b2300b9e HY |
391 | dev_info->is_shared = 0; |
392 | set_disk_ro(dev_info->gd, 0); | |
1da177e4 | 393 | } else { |
1da177e4 LT |
394 | rc = -EINVAL; |
395 | goto out; | |
396 | } | |
397 | rc = count; | |
398 | goto out; | |
399 | ||
400 | removeseg: | |
93098bf0 HY |
401 | pr_err("DCSS device %s is removed after a failed access mode " |
402 | "change\n", dev_info->segment_name); | |
b2300b9e HY |
403 | temp = entry; |
404 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
405 | if (entry != temp) | |
406 | segment_unload(entry->segment_name); | |
407 | } | |
1da177e4 LT |
408 | list_del(&dev_info->lh); |
409 | ||
410 | del_gendisk(dev_info->gd); | |
1312f40e | 411 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
412 | dev_info->gd->queue = NULL; |
413 | put_disk(dev_info->gd); | |
931bb68b | 414 | rc = device_schedule_callback(dev, dcssblk_unregister_callback); |
1da177e4 LT |
415 | out: |
416 | up_write(&dcssblk_devices_sem); | |
417 | return rc; | |
418 | } | |
419 | ||
420 | /* | |
421 | * device attribute for save operation on current copy | |
422 | * of the segment. If the segment is busy, saving will | |
423 | * become pending until it gets released, which can be | |
424 | * undone by storing a non-true value to this entry. | |
425 | * (show + store) | |
426 | */ | |
427 | static ssize_t | |
e404e274 | 428 | dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
429 | { |
430 | struct dcssblk_dev_info *dev_info; | |
431 | ||
432 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
433 | return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); | |
434 | } | |
435 | ||
436 | static ssize_t | |
e404e274 | 437 | dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
438 | { |
439 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 440 | struct segment_info *entry; |
1da177e4 | 441 | |
ded77fb4 | 442 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 443 | return -EINVAL; |
1da177e4 LT |
444 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
445 | ||
446 | down_write(&dcssblk_devices_sem); | |
447 | if (inbuf[0] == '1') { | |
448 | if (atomic_read(&dev_info->use_count) == 0) { | |
449 | // device is idle => we save immediately | |
93098bf0 HY |
450 | pr_info("All DCSSs that map to device %s are " |
451 | "saved\n", dev_info->segment_name); | |
b2300b9e HY |
452 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
453 | segment_save(entry->segment_name); | |
454 | } | |
1da177e4 LT |
455 | } else { |
456 | // device is busy => we save it when it becomes | |
457 | // idle in dcssblk_release | |
93098bf0 HY |
458 | pr_info("Device %s is in use, its DCSSs will be " |
459 | "saved when it becomes idle\n", | |
460 | dev_info->segment_name); | |
1da177e4 LT |
461 | dev_info->save_pending = 1; |
462 | } | |
463 | } else if (inbuf[0] == '0') { | |
464 | if (dev_info->save_pending) { | |
465 | // device is busy & the user wants to undo his save | |
466 | // request | |
467 | dev_info->save_pending = 0; | |
93098bf0 HY |
468 | pr_info("A pending save request for device %s " |
469 | "has been canceled\n", | |
470 | dev_info->segment_name); | |
1da177e4 LT |
471 | } |
472 | } else { | |
473 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
474 | return -EINVAL; |
475 | } | |
476 | up_write(&dcssblk_devices_sem); | |
477 | return count; | |
478 | } | |
479 | ||
b2300b9e HY |
480 | /* |
481 | * device attribute for showing all segments in a device | |
482 | */ | |
483 | static ssize_t | |
484 | dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, | |
485 | char *buf) | |
486 | { | |
487 | int i; | |
488 | ||
489 | struct dcssblk_dev_info *dev_info; | |
490 | struct segment_info *entry; | |
491 | ||
492 | down_read(&dcssblk_devices_sem); | |
493 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
494 | i = 0; | |
495 | buf[0] = '\0'; | |
496 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
497 | strcpy(&buf[i], entry->segment_name); | |
498 | i += strlen(entry->segment_name); | |
499 | buf[i] = '\n'; | |
500 | i++; | |
501 | } | |
502 | up_read(&dcssblk_devices_sem); | |
503 | return i; | |
504 | } | |
505 | ||
1da177e4 LT |
506 | /* |
507 | * device attribute for adding devices | |
508 | */ | |
509 | static ssize_t | |
e404e274 | 510 | dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 511 | { |
b2300b9e | 512 | int rc, i, j, num_of_segments; |
1da177e4 | 513 | struct dcssblk_dev_info *dev_info; |
b2300b9e | 514 | struct segment_info *seg_info, *temp; |
1da177e4 LT |
515 | char *local_buf; |
516 | unsigned long seg_byte_size; | |
517 | ||
518 | dev_info = NULL; | |
b2300b9e | 519 | seg_info = NULL; |
1da177e4 LT |
520 | if (dev != dcssblk_root_dev) { |
521 | rc = -EINVAL; | |
522 | goto out_nobuf; | |
523 | } | |
b2300b9e HY |
524 | if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { |
525 | rc = -ENAMETOOLONG; | |
526 | goto out_nobuf; | |
527 | } | |
528 | ||
1da177e4 LT |
529 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
530 | if (local_buf == NULL) { | |
531 | rc = -ENOMEM; | |
532 | goto out_nobuf; | |
533 | } | |
b2300b9e | 534 | |
1da177e4 LT |
535 | /* |
536 | * parse input | |
537 | */ | |
b2300b9e | 538 | num_of_segments = 0; |
1da177e4 | 539 | for (i = 0; ((buf[i] != '\0') && (buf[i] != '\n') && i < count); i++) { |
b2300b9e HY |
540 | for (j = i; (buf[j] != ':') && |
541 | (buf[j] != '\0') && | |
542 | (buf[j] != '\n') && | |
543 | j < count; j++) { | |
544 | local_buf[j-i] = toupper(buf[j]); | |
545 | } | |
546 | local_buf[j-i] = '\0'; | |
547 | if (((j - i) == 0) || ((j - i) > 8)) { | |
548 | rc = -ENAMETOOLONG; | |
549 | goto seg_list_del; | |
550 | } | |
551 | ||
552 | rc = dcssblk_load_segment(local_buf, &seg_info); | |
553 | if (rc < 0) | |
554 | goto seg_list_del; | |
555 | /* | |
556 | * get a struct dcssblk_dev_info | |
557 | */ | |
558 | if (num_of_segments == 0) { | |
559 | dev_info = kzalloc(sizeof(struct dcssblk_dev_info), | |
560 | GFP_KERNEL); | |
561 | if (dev_info == NULL) { | |
562 | rc = -ENOMEM; | |
563 | goto out; | |
564 | } | |
565 | strcpy(dev_info->segment_name, local_buf); | |
566 | dev_info->segment_type = seg_info->segment_type; | |
567 | INIT_LIST_HEAD(&dev_info->seg_list); | |
568 | } | |
569 | list_add_tail(&seg_info->lh, &dev_info->seg_list); | |
570 | num_of_segments++; | |
571 | i = j; | |
572 | ||
573 | if ((buf[j] == '\0') || (buf[j] == '\n')) | |
574 | break; | |
1da177e4 | 575 | } |
b2300b9e HY |
576 | |
577 | /* no trailing colon at the end of the input */ | |
578 | if ((i > 0) && (buf[i-1] == ':')) { | |
1da177e4 | 579 | rc = -ENAMETOOLONG; |
b2300b9e | 580 | goto seg_list_del; |
1da177e4 | 581 | } |
b2300b9e HY |
582 | strlcpy(local_buf, buf, i + 1); |
583 | dev_info->num_of_segments = num_of_segments; | |
584 | rc = dcssblk_is_continuous(dev_info); | |
585 | if (rc < 0) | |
586 | goto seg_list_del; | |
587 | ||
588 | dev_info->start = dcssblk_find_lowest_addr(dev_info); | |
589 | dev_info->end = dcssblk_find_highest_addr(dev_info); | |
1da177e4 | 590 | |
b2300b9e | 591 | dev_set_name(&dev_info->dev, dev_info->segment_name); |
1da177e4 LT |
592 | dev_info->dev.release = dcssblk_release_segment; |
593 | INIT_LIST_HEAD(&dev_info->lh); | |
1da177e4 LT |
594 | dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); |
595 | if (dev_info->gd == NULL) { | |
596 | rc = -ENOMEM; | |
b2300b9e | 597 | goto seg_list_del; |
1da177e4 LT |
598 | } |
599 | dev_info->gd->major = dcssblk_major; | |
600 | dev_info->gd->fops = &dcssblk_devops; | |
601 | dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); | |
602 | dev_info->gd->queue = dev_info->dcssblk_queue; | |
603 | dev_info->gd->private_data = dev_info; | |
604 | dev_info->gd->driverfs_dev = &dev_info->dev; | |
c5411dba | 605 | blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); |
e1defc4f | 606 | blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); |
b2300b9e | 607 | |
1da177e4 LT |
608 | seg_byte_size = (dev_info->end - dev_info->start + 1); |
609 | set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors | |
93098bf0 HY |
610 | pr_info("Loaded %s with total size %lu bytes and capacity %lu " |
611 | "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); | |
1da177e4 | 612 | |
1da177e4 LT |
613 | dev_info->save_pending = 0; |
614 | dev_info->is_shared = 1; | |
615 | dev_info->dev.parent = dcssblk_root_dev; | |
616 | ||
617 | /* | |
b2300b9e | 618 | *get minor, add to list |
1da177e4 LT |
619 | */ |
620 | down_write(&dcssblk_devices_sem); | |
b2300b9e | 621 | if (dcssblk_get_segment_by_name(local_buf)) { |
04f64b57 | 622 | rc = -EEXIST; |
b2300b9e | 623 | goto release_gd; |
04f64b57 | 624 | } |
1da177e4 | 625 | rc = dcssblk_assign_free_minor(dev_info); |
b2300b9e HY |
626 | if (rc) |
627 | goto release_gd; | |
1da177e4 | 628 | sprintf(dev_info->gd->disk_name, "dcssblk%d", |
d0591485 | 629 | dev_info->gd->first_minor); |
1da177e4 LT |
630 | list_add_tail(&dev_info->lh, &dcssblk_devices); |
631 | ||
632 | if (!try_module_get(THIS_MODULE)) { | |
633 | rc = -ENODEV; | |
b2300b9e | 634 | goto dev_list_del; |
1da177e4 LT |
635 | } |
636 | /* | |
637 | * register the device | |
638 | */ | |
639 | rc = device_register(&dev_info->dev); | |
640 | if (rc) { | |
1da177e4 | 641 | module_put(THIS_MODULE); |
b2300b9e | 642 | goto dev_list_del; |
1da177e4 LT |
643 | } |
644 | get_device(&dev_info->dev); | |
645 | rc = device_create_file(&dev_info->dev, &dev_attr_shared); | |
646 | if (rc) | |
647 | goto unregister_dev; | |
648 | rc = device_create_file(&dev_info->dev, &dev_attr_save); | |
b2300b9e HY |
649 | if (rc) |
650 | goto unregister_dev; | |
651 | rc = device_create_file(&dev_info->dev, &dev_attr_seglist); | |
1da177e4 LT |
652 | if (rc) |
653 | goto unregister_dev; | |
654 | ||
436d1bc7 CB |
655 | add_disk(dev_info->gd); |
656 | ||
1da177e4 LT |
657 | switch (dev_info->segment_type) { |
658 | case SEG_TYPE_SR: | |
659 | case SEG_TYPE_ER: | |
660 | case SEG_TYPE_SC: | |
661 | set_disk_ro(dev_info->gd,1); | |
662 | break; | |
663 | default: | |
664 | set_disk_ro(dev_info->gd,0); | |
665 | break; | |
666 | } | |
1da177e4 LT |
667 | up_write(&dcssblk_devices_sem); |
668 | rc = count; | |
669 | goto out; | |
670 | ||
671 | unregister_dev: | |
1da177e4 | 672 | list_del(&dev_info->lh); |
1312f40e | 673 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
674 | dev_info->gd->queue = NULL; |
675 | put_disk(dev_info->gd); | |
676 | device_unregister(&dev_info->dev); | |
b2300b9e HY |
677 | list_for_each_entry(seg_info, &dev_info->seg_list, lh) { |
678 | segment_unload(seg_info->segment_name); | |
679 | } | |
1da177e4 LT |
680 | put_device(&dev_info->dev); |
681 | up_write(&dcssblk_devices_sem); | |
682 | goto out; | |
b2300b9e | 683 | dev_list_del: |
1da177e4 | 684 | list_del(&dev_info->lh); |
b2300b9e | 685 | release_gd: |
1312f40e | 686 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
687 | dev_info->gd->queue = NULL; |
688 | put_disk(dev_info->gd); | |
b2300b9e HY |
689 | up_write(&dcssblk_devices_sem); |
690 | seg_list_del: | |
691 | if (dev_info == NULL) | |
692 | goto out; | |
693 | list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) { | |
694 | list_del(&seg_info->lh); | |
695 | segment_unload(seg_info->segment_name); | |
696 | kfree(seg_info); | |
697 | } | |
1da177e4 LT |
698 | kfree(dev_info); |
699 | out: | |
700 | kfree(local_buf); | |
701 | out_nobuf: | |
702 | return rc; | |
703 | } | |
704 | ||
705 | /* | |
706 | * device attribute for removing devices | |
707 | */ | |
708 | static ssize_t | |
e404e274 | 709 | dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
710 | { |
711 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 712 | struct segment_info *entry; |
1da177e4 LT |
713 | int rc, i; |
714 | char *local_buf; | |
715 | ||
716 | if (dev != dcssblk_root_dev) { | |
717 | return -EINVAL; | |
718 | } | |
719 | local_buf = kmalloc(count + 1, GFP_KERNEL); | |
720 | if (local_buf == NULL) { | |
721 | return -ENOMEM; | |
722 | } | |
723 | /* | |
724 | * parse input | |
725 | */ | |
726 | for (i = 0; ((*(buf+i)!='\0') && (*(buf+i)!='\n') && i < count); i++) { | |
727 | local_buf[i] = toupper(buf[i]); | |
728 | } | |
729 | local_buf[i] = '\0'; | |
730 | if ((i == 0) || (i > 8)) { | |
731 | rc = -ENAMETOOLONG; | |
732 | goto out_buf; | |
733 | } | |
734 | ||
735 | down_write(&dcssblk_devices_sem); | |
736 | dev_info = dcssblk_get_device_by_name(local_buf); | |
737 | if (dev_info == NULL) { | |
738 | up_write(&dcssblk_devices_sem); | |
93098bf0 HY |
739 | pr_warning("Device %s cannot be removed because it is not a " |
740 | "known device\n", local_buf); | |
1da177e4 LT |
741 | rc = -ENODEV; |
742 | goto out_buf; | |
743 | } | |
744 | if (atomic_read(&dev_info->use_count) != 0) { | |
745 | up_write(&dcssblk_devices_sem); | |
93098bf0 HY |
746 | pr_warning("Device %s cannot be removed while it is in " |
747 | "use\n", local_buf); | |
1da177e4 LT |
748 | rc = -EBUSY; |
749 | goto out_buf; | |
750 | } | |
1da177e4 | 751 | |
b2300b9e | 752 | list_del(&dev_info->lh); |
1da177e4 | 753 | del_gendisk(dev_info->gd); |
1312f40e | 754 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
755 | dev_info->gd->queue = NULL; |
756 | put_disk(dev_info->gd); | |
757 | device_unregister(&dev_info->dev); | |
b2300b9e HY |
758 | |
759 | /* unload all related segments */ | |
760 | list_for_each_entry(entry, &dev_info->seg_list, lh) | |
761 | segment_unload(entry->segment_name); | |
762 | ||
1da177e4 LT |
763 | put_device(&dev_info->dev); |
764 | up_write(&dcssblk_devices_sem); | |
765 | ||
766 | rc = count; | |
767 | out_buf: | |
768 | kfree(local_buf); | |
769 | return rc; | |
770 | } | |
771 | ||
772 | static int | |
46d74326 | 773 | dcssblk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
774 | { |
775 | struct dcssblk_dev_info *dev_info; | |
776 | int rc; | |
777 | ||
46d74326 | 778 | dev_info = bdev->bd_disk->private_data; |
1da177e4 LT |
779 | if (NULL == dev_info) { |
780 | rc = -ENODEV; | |
781 | goto out; | |
782 | } | |
783 | atomic_inc(&dev_info->use_count); | |
46d74326 | 784 | bdev->bd_block_size = 4096; |
1da177e4 LT |
785 | rc = 0; |
786 | out: | |
787 | return rc; | |
788 | } | |
789 | ||
790 | static int | |
46d74326 | 791 | dcssblk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 792 | { |
46d74326 | 793 | struct dcssblk_dev_info *dev_info = disk->private_data; |
b2300b9e | 794 | struct segment_info *entry; |
1da177e4 LT |
795 | int rc; |
796 | ||
46d74326 | 797 | if (!dev_info) { |
1da177e4 LT |
798 | rc = -ENODEV; |
799 | goto out; | |
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 HY |
806 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
807 | segment_save(entry->segment_name); | |
808 | } | |
1da177e4 LT |
809 | dev_info->save_pending = 0; |
810 | } | |
811 | up_write(&dcssblk_devices_sem); | |
812 | rc = 0; | |
813 | out: | |
814 | return rc; | |
815 | } | |
816 | ||
817 | static int | |
165125e1 | 818 | dcssblk_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
819 | { |
820 | struct dcssblk_dev_info *dev_info; | |
821 | struct bio_vec *bvec; | |
822 | unsigned long index; | |
823 | unsigned long page_addr; | |
824 | unsigned long source_addr; | |
825 | unsigned long bytes_done; | |
826 | int i; | |
827 | ||
828 | bytes_done = 0; | |
829 | dev_info = bio->bi_bdev->bd_disk->private_data; | |
830 | if (dev_info == NULL) | |
831 | goto fail; | |
832 | if ((bio->bi_sector & 7) != 0 || (bio->bi_size & 4095) != 0) | |
833 | /* Request is not page-aligned. */ | |
834 | goto fail; | |
835 | if (((bio->bi_size >> 9) + bio->bi_sector) | |
836 | > get_capacity(bio->bi_bdev->bd_disk)) { | |
837 | /* Request beyond end of DCSS segment. */ | |
838 | goto fail; | |
839 | } | |
420edbcc CO |
840 | /* verify data transfer direction */ |
841 | if (dev_info->is_shared) { | |
842 | switch (dev_info->segment_type) { | |
843 | case SEG_TYPE_SR: | |
844 | case SEG_TYPE_ER: | |
845 | case SEG_TYPE_SC: | |
846 | /* cannot write to these segments */ | |
847 | if (bio_data_dir(bio) == WRITE) { | |
93098bf0 HY |
848 | pr_warning("Writing to %s failed because it " |
849 | "is a read-only device\n", | |
2a0217d5 | 850 | dev_name(&dev_info->dev)); |
420edbcc CO |
851 | goto fail; |
852 | } | |
853 | } | |
854 | } | |
855 | ||
1da177e4 LT |
856 | index = (bio->bi_sector >> 3); |
857 | bio_for_each_segment(bvec, bio, i) { | |
858 | page_addr = (unsigned long) | |
859 | page_address(bvec->bv_page) + bvec->bv_offset; | |
860 | source_addr = dev_info->start + (index<<12) + bytes_done; | |
39f73b28 | 861 | if (unlikely((page_addr & 4095) != 0) || (bvec->bv_len & 4095) != 0) |
1da177e4 LT |
862 | // More paranoia. |
863 | goto fail; | |
864 | if (bio_data_dir(bio) == READ) { | |
865 | memcpy((void*)page_addr, (void*)source_addr, | |
866 | bvec->bv_len); | |
867 | } else { | |
868 | memcpy((void*)source_addr, (void*)page_addr, | |
869 | bvec->bv_len); | |
870 | } | |
871 | bytes_done += bvec->bv_len; | |
872 | } | |
6712ecf8 | 873 | bio_endio(bio, 0); |
1da177e4 LT |
874 | return 0; |
875 | fail: | |
6712ecf8 | 876 | bio_io_error(bio); |
420edbcc CO |
877 | return 0; |
878 | } | |
879 | ||
880 | static int | |
881 | dcssblk_direct_access (struct block_device *bdev, sector_t secnum, | |
30afcb4b | 882 | void **kaddr, unsigned long *pfn) |
420edbcc CO |
883 | { |
884 | struct dcssblk_dev_info *dev_info; | |
885 | unsigned long pgoff; | |
886 | ||
887 | dev_info = bdev->bd_disk->private_data; | |
888 | if (!dev_info) | |
889 | return -ENODEV; | |
890 | if (secnum % (PAGE_SIZE/512)) | |
891 | return -EINVAL; | |
892 | pgoff = secnum / (PAGE_SIZE / 512); | |
893 | if ((pgoff+1)*PAGE_SIZE-1 > dev_info->end - dev_info->start) | |
894 | return -ERANGE; | |
30afcb4b JH |
895 | *kaddr = (void *) (dev_info->start+pgoff*PAGE_SIZE); |
896 | *pfn = virt_to_phys(*kaddr) >> PAGE_SHIFT; | |
897 | ||
1da177e4 LT |
898 | return 0; |
899 | } | |
900 | ||
901 | static void | |
902 | dcssblk_check_params(void) | |
903 | { | |
904 | int rc, i, j, k; | |
b2300b9e | 905 | char buf[DCSSBLK_PARM_LEN + 1]; |
1da177e4 LT |
906 | struct dcssblk_dev_info *dev_info; |
907 | ||
908 | for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); | |
909 | i++) { | |
910 | for (j = i; (dcssblk_segments[j] != ',') && | |
911 | (dcssblk_segments[j] != '\0') && | |
912 | (dcssblk_segments[j] != '(') && | |
b2300b9e | 913 | (j < DCSSBLK_PARM_LEN); j++) |
1da177e4 LT |
914 | { |
915 | buf[j-i] = dcssblk_segments[j]; | |
916 | } | |
917 | buf[j-i] = '\0'; | |
f901e5d1 | 918 | rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); |
1da177e4 | 919 | if ((rc >= 0) && (dcssblk_segments[j] == '(')) { |
b2300b9e | 920 | for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) |
1da177e4 | 921 | buf[k] = toupper(buf[k]); |
b2300b9e | 922 | buf[k] = '\0'; |
1da177e4 LT |
923 | if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { |
924 | down_read(&dcssblk_devices_sem); | |
925 | dev_info = dcssblk_get_device_by_name(buf); | |
926 | up_read(&dcssblk_devices_sem); | |
927 | if (dev_info) | |
928 | dcssblk_shared_store(&dev_info->dev, | |
f901e5d1 | 929 | NULL, "0\n", 2); |
1da177e4 LT |
930 | } |
931 | } | |
932 | while ((dcssblk_segments[j] != ',') && | |
933 | (dcssblk_segments[j] != '\0')) | |
934 | { | |
935 | j++; | |
936 | } | |
937 | if (dcssblk_segments[j] == '\0') | |
938 | break; | |
939 | i = j; | |
940 | } | |
941 | } | |
942 | ||
c369527f GS |
943 | /* |
944 | * Suspend / Resume | |
945 | */ | |
946 | static int dcssblk_freeze(struct device *dev) | |
947 | { | |
948 | struct dcssblk_dev_info *dev_info; | |
949 | int rc = 0; | |
950 | ||
951 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
952 | switch (dev_info->segment_type) { | |
953 | case SEG_TYPE_SR: | |
954 | case SEG_TYPE_ER: | |
955 | case SEG_TYPE_SC: | |
956 | if (!dev_info->is_shared) | |
957 | rc = -EINVAL; | |
958 | break; | |
959 | default: | |
960 | rc = -EINVAL; | |
961 | break; | |
962 | } | |
963 | if (rc) | |
964 | break; | |
965 | } | |
966 | if (rc) | |
2c48c4d6 CB |
967 | pr_err("Suspending the system failed because DCSS device %s " |
968 | "is writable\n", | |
c369527f GS |
969 | dev_info->segment_name); |
970 | return rc; | |
971 | } | |
972 | ||
973 | static int dcssblk_restore(struct device *dev) | |
974 | { | |
975 | struct dcssblk_dev_info *dev_info; | |
976 | struct segment_info *entry; | |
977 | unsigned long start, end; | |
978 | int rc = 0; | |
979 | ||
980 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
981 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
982 | segment_unload(entry->segment_name); | |
983 | rc = segment_load(entry->segment_name, SEGMENT_SHARED, | |
984 | &start, &end); | |
985 | if (rc < 0) { | |
986 | // TODO in_use check ? | |
987 | segment_warning(rc, entry->segment_name); | |
988 | goto out_panic; | |
989 | } | |
990 | if (start != entry->start || end != entry->end) { | |
2c48c4d6 CB |
991 | pr_err("The address range of DCSS %s changed " |
992 | "while the system was suspended\n", | |
c369527f GS |
993 | entry->segment_name); |
994 | goto out_panic; | |
995 | } | |
996 | } | |
997 | } | |
998 | return 0; | |
999 | out_panic: | |
1000 | panic("fatal dcssblk resume error\n"); | |
1001 | } | |
1002 | ||
1003 | static int dcssblk_thaw(struct device *dev) | |
1004 | { | |
1005 | return 0; | |
1006 | } | |
1007 | ||
1008 | static struct dev_pm_ops dcssblk_pm_ops = { | |
1009 | .freeze = dcssblk_freeze, | |
1010 | .thaw = dcssblk_thaw, | |
1011 | .restore = dcssblk_restore, | |
1012 | }; | |
1013 | ||
1014 | static struct platform_driver dcssblk_pdrv = { | |
1015 | .driver = { | |
1016 | .name = "dcssblk", | |
1017 | .owner = THIS_MODULE, | |
1018 | .pm = &dcssblk_pm_ops, | |
1019 | }, | |
1020 | }; | |
1021 | ||
1022 | static struct platform_device *dcssblk_pdev; | |
1023 | ||
1024 | ||
1da177e4 LT |
1025 | /* |
1026 | * The init/exit functions. | |
1027 | */ | |
1028 | static void __exit | |
1029 | dcssblk_exit(void) | |
1030 | { | |
c369527f GS |
1031 | platform_device_unregister(dcssblk_pdev); |
1032 | platform_driver_unregister(&dcssblk_pdrv); | |
035da16f | 1033 | root_device_unregister(dcssblk_root_dev); |
00d59405 | 1034 | unregister_blkdev(dcssblk_major, DCSSBLK_NAME); |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | static int __init | |
1038 | dcssblk_init(void) | |
1039 | { | |
1040 | int rc; | |
1041 | ||
c369527f GS |
1042 | rc = platform_driver_register(&dcssblk_pdrv); |
1043 | if (rc) | |
1da177e4 | 1044 | return rc; |
c369527f GS |
1045 | |
1046 | dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL, | |
1047 | 0); | |
1048 | if (IS_ERR(dcssblk_pdev)) { | |
1049 | rc = PTR_ERR(dcssblk_pdev); | |
1050 | goto out_pdrv; | |
1da177e4 | 1051 | } |
c369527f GS |
1052 | |
1053 | dcssblk_root_dev = root_device_register("dcssblk"); | |
1054 | if (IS_ERR(dcssblk_root_dev)) { | |
1055 | rc = PTR_ERR(dcssblk_root_dev); | |
1056 | goto out_pdev; | |
1da177e4 | 1057 | } |
c369527f GS |
1058 | rc = device_create_file(dcssblk_root_dev, &dev_attr_add); |
1059 | if (rc) | |
1060 | goto out_root; | |
1061 | rc = device_create_file(dcssblk_root_dev, &dev_attr_remove); | |
1062 | if (rc) | |
1063 | goto out_root; | |
1da177e4 | 1064 | rc = register_blkdev(0, DCSSBLK_NAME); |
c369527f GS |
1065 | if (rc < 0) |
1066 | goto out_root; | |
1da177e4 LT |
1067 | dcssblk_major = rc; |
1068 | init_rwsem(&dcssblk_devices_sem); | |
1069 | ||
1070 | dcssblk_check_params(); | |
1da177e4 | 1071 | return 0; |
c369527f GS |
1072 | |
1073 | out_root: | |
1074 | root_device_unregister(dcssblk_root_dev); | |
1075 | out_pdev: | |
1076 | platform_device_unregister(dcssblk_pdev); | |
1077 | out_pdrv: | |
1078 | platform_driver_unregister(&dcssblk_pdrv); | |
1079 | return rc; | |
1da177e4 LT |
1080 | } |
1081 | ||
1082 | module_init(dcssblk_init); | |
1083 | module_exit(dcssblk_exit); | |
1084 | ||
1085 | module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); | |
1086 | MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " | |
b2300b9e HY |
1087 | "comma-separated list, names in each set separated " |
1088 | "by commas are separated by colons, each set contains " | |
1089 | "names of contiguous segments and each name max. 8 chars.\n" | |
1090 | "Adding \"(local)\" to the end of each set equals echoing 0 " | |
1091 | "to /sys/devices/dcssblk/<device name>/shared after loading " | |
1092 | "the contiguous segments - \n" | |
1093 | "e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\""); | |
1da177e4 LT |
1094 | |
1095 | MODULE_LICENSE("GPL"); |