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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> | |
6e9624b8 | 17 | #include <linux/smp_lock.h> |
1da177e4 LT |
18 | #include <linux/completion.h> |
19 | #include <linux/interrupt.h> | |
c369527f GS |
20 | #include <linux/platform_device.h> |
21 | #include <asm/extmem.h> | |
22 | #include <asm/io.h> | |
1da177e4 | 23 | |
1da177e4 LT |
24 | #define DCSSBLK_NAME "dcssblk" |
25 | #define DCSSBLK_MINORS_PER_DISK 1 | |
26 | #define DCSSBLK_PARM_LEN 400 | |
98df67b3 | 27 | #define DCSS_BUS_ID_SIZE 20 |
1da177e4 | 28 | |
46d74326 AV |
29 | static int dcssblk_open(struct block_device *bdev, fmode_t mode); |
30 | static int dcssblk_release(struct gendisk *disk, fmode_t mode); | |
1da177e4 | 31 | static int dcssblk_make_request(struct request_queue *q, struct bio *bio); |
420edbcc | 32 | static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum, |
30afcb4b | 33 | void **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); |
e404e274 | 73 | static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 74 | size_t count); |
e404e274 YI |
75 | static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf); |
76 | static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf, | |
1da177e4 | 77 | size_t count); |
e404e274 | 78 | static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf); |
b2300b9e HY |
79 | static ssize_t dcssblk_seglist_show(struct device *dev, |
80 | struct device_attribute *attr, | |
81 | char *buf); | |
1da177e4 LT |
82 | |
83 | static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); | |
84 | static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); | |
b2300b9e | 85 | static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, |
1da177e4 | 86 | dcssblk_save_store); |
b2300b9e | 87 | static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, |
1da177e4 | 88 | dcssblk_shared_store); |
b2300b9e | 89 | static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); |
1da177e4 LT |
90 | |
91 | static struct device *dcssblk_root_dev; | |
92 | ||
c11ca97e | 93 | static LIST_HEAD(dcssblk_devices); |
1da177e4 LT |
94 | static struct rw_semaphore dcssblk_devices_sem; |
95 | ||
96 | /* | |
97 | * release function for segment device. | |
98 | */ | |
99 | static void | |
100 | dcssblk_release_segment(struct device *dev) | |
101 | { | |
b2300b9e HY |
102 | struct dcssblk_dev_info *dev_info; |
103 | struct segment_info *entry, *temp; | |
104 | ||
105 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
106 | list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { | |
107 | list_del(&entry->lh); | |
108 | kfree(entry); | |
109 | } | |
110 | kfree(dev_info); | |
1da177e4 LT |
111 | module_put(THIS_MODULE); |
112 | } | |
113 | ||
114 | /* | |
115 | * get a minor number. needs to be called with | |
116 | * down_write(&dcssblk_devices_sem) and the | |
117 | * device needs to be enqueued before the semaphore is | |
118 | * freed. | |
119 | */ | |
4d284cac | 120 | static int |
1da177e4 LT |
121 | dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) |
122 | { | |
123 | int minor, found; | |
124 | struct dcssblk_dev_info *entry; | |
125 | ||
126 | if (dev_info == NULL) | |
127 | return -EINVAL; | |
128 | for (minor = 0; minor < (1<<MINORBITS); minor++) { | |
129 | found = 0; | |
130 | // test if minor available | |
131 | list_for_each_entry(entry, &dcssblk_devices, lh) | |
d0591485 | 132 | if (minor == entry->gd->first_minor) |
1da177e4 LT |
133 | found++; |
134 | if (!found) break; // got unused minor | |
135 | } | |
136 | if (found) | |
137 | return -EBUSY; | |
138 | dev_info->gd->first_minor = minor; | |
139 | return 0; | |
140 | } | |
141 | ||
142 | /* | |
143 | * get the struct dcssblk_dev_info from dcssblk_devices | |
144 | * for the given name. | |
145 | * down_read(&dcssblk_devices_sem) must be held. | |
146 | */ | |
147 | static struct dcssblk_dev_info * | |
148 | dcssblk_get_device_by_name(char *name) | |
149 | { | |
150 | struct dcssblk_dev_info *entry; | |
151 | ||
152 | list_for_each_entry(entry, &dcssblk_devices, lh) { | |
153 | if (!strcmp(name, entry->segment_name)) { | |
154 | return entry; | |
155 | } | |
156 | } | |
157 | return NULL; | |
158 | } | |
159 | ||
b2300b9e HY |
160 | /* |
161 | * get the struct segment_info from seg_list | |
162 | * for the given name. | |
163 | * down_read(&dcssblk_devices_sem) must be held. | |
164 | */ | |
165 | static struct segment_info * | |
166 | dcssblk_get_segment_by_name(char *name) | |
167 | { | |
168 | struct dcssblk_dev_info *dev_info; | |
169 | struct segment_info *entry; | |
170 | ||
171 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
172 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
173 | if (!strcmp(name, entry->segment_name)) | |
174 | return entry; | |
175 | } | |
176 | } | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | /* | |
181 | * get the highest address of the multi-segment block. | |
182 | */ | |
183 | static unsigned long | |
184 | dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) | |
185 | { | |
186 | unsigned long highest_addr; | |
187 | struct segment_info *entry; | |
188 | ||
189 | highest_addr = 0; | |
190 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
191 | if (highest_addr < entry->end) | |
192 | highest_addr = entry->end; | |
193 | } | |
194 | return highest_addr; | |
195 | } | |
196 | ||
197 | /* | |
198 | * get the lowest address of the multi-segment block. | |
199 | */ | |
200 | static unsigned long | |
201 | dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) | |
202 | { | |
203 | int set_first; | |
204 | unsigned long lowest_addr; | |
205 | struct segment_info *entry; | |
206 | ||
207 | set_first = 0; | |
208 | lowest_addr = 0; | |
209 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
210 | if (set_first == 0) { | |
211 | lowest_addr = entry->start; | |
212 | set_first = 1; | |
213 | } else { | |
214 | if (lowest_addr > entry->start) | |
215 | lowest_addr = entry->start; | |
216 | } | |
217 | } | |
218 | return lowest_addr; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Check continuity of segments. | |
223 | */ | |
224 | static int | |
225 | dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) | |
226 | { | |
227 | int i, j, rc; | |
228 | struct segment_info *sort_list, *entry, temp; | |
229 | ||
230 | if (dev_info->num_of_segments <= 1) | |
231 | return 0; | |
232 | ||
233 | sort_list = kzalloc( | |
234 | sizeof(struct segment_info) * dev_info->num_of_segments, | |
235 | GFP_KERNEL); | |
236 | if (sort_list == NULL) | |
237 | return -ENOMEM; | |
238 | i = 0; | |
239 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
240 | memcpy(&sort_list[i], entry, sizeof(struct segment_info)); | |
241 | i++; | |
242 | } | |
243 | ||
244 | /* sort segments */ | |
245 | for (i = 0; i < dev_info->num_of_segments; i++) | |
246 | for (j = 0; j < dev_info->num_of_segments; j++) | |
247 | if (sort_list[j].start > sort_list[i].start) { | |
248 | memcpy(&temp, &sort_list[i], | |
249 | sizeof(struct segment_info)); | |
250 | memcpy(&sort_list[i], &sort_list[j], | |
251 | sizeof(struct segment_info)); | |
252 | memcpy(&sort_list[j], &temp, | |
253 | sizeof(struct segment_info)); | |
254 | } | |
255 | ||
256 | /* check continuity */ | |
257 | for (i = 0; i < dev_info->num_of_segments - 1; i++) { | |
258 | if ((sort_list[i].end + 1) != sort_list[i+1].start) { | |
93098bf0 HY |
259 | pr_err("Adjacent DCSSs %s and %s are not " |
260 | "contiguous\n", sort_list[i].segment_name, | |
261 | sort_list[i+1].segment_name); | |
b2300b9e HY |
262 | rc = -EINVAL; |
263 | goto out; | |
264 | } | |
265 | /* EN and EW are allowed in a block device */ | |
266 | if (sort_list[i].segment_type != sort_list[i+1].segment_type) { | |
267 | if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || | |
268 | (sort_list[i].segment_type == SEG_TYPE_ER) || | |
269 | !(sort_list[i+1].segment_type & | |
270 | SEGMENT_EXCLUSIVE) || | |
271 | (sort_list[i+1].segment_type == SEG_TYPE_ER)) { | |
93098bf0 HY |
272 | pr_err("DCSS %s and DCSS %s have " |
273 | "incompatible types\n", | |
274 | sort_list[i].segment_name, | |
275 | sort_list[i+1].segment_name); | |
b2300b9e HY |
276 | rc = -EINVAL; |
277 | goto out; | |
278 | } | |
279 | } | |
280 | } | |
281 | rc = 0; | |
282 | out: | |
283 | kfree(sort_list); | |
284 | return rc; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Load a segment | |
289 | */ | |
290 | static int | |
291 | dcssblk_load_segment(char *name, struct segment_info **seg_info) | |
292 | { | |
293 | int rc; | |
294 | ||
295 | /* already loaded? */ | |
296 | down_read(&dcssblk_devices_sem); | |
297 | *seg_info = dcssblk_get_segment_by_name(name); | |
298 | up_read(&dcssblk_devices_sem); | |
299 | if (*seg_info != NULL) | |
300 | return -EEXIST; | |
301 | ||
302 | /* get a struct segment_info */ | |
303 | *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); | |
304 | if (*seg_info == NULL) | |
305 | return -ENOMEM; | |
306 | ||
307 | strcpy((*seg_info)->segment_name, name); | |
308 | ||
309 | /* load the segment */ | |
310 | rc = segment_load(name, SEGMENT_SHARED, | |
311 | &(*seg_info)->start, &(*seg_info)->end); | |
312 | if (rc < 0) { | |
313 | segment_warning(rc, (*seg_info)->segment_name); | |
314 | kfree(*seg_info); | |
315 | } else { | |
316 | INIT_LIST_HEAD(&(*seg_info)->lh); | |
317 | (*seg_info)->segment_type = rc; | |
318 | } | |
319 | return rc; | |
320 | } | |
321 | ||
931bb68b GS |
322 | static void dcssblk_unregister_callback(struct device *dev) |
323 | { | |
324 | device_unregister(dev); | |
325 | put_device(dev); | |
326 | } | |
327 | ||
1da177e4 LT |
328 | /* |
329 | * device attribute for switching shared/nonshared (exclusive) | |
330 | * operation (show + store) | |
331 | */ | |
332 | static ssize_t | |
e404e274 | 333 | dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
334 | { |
335 | struct dcssblk_dev_info *dev_info; | |
336 | ||
337 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
338 | return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); | |
339 | } | |
340 | ||
341 | static ssize_t | |
e404e274 | 342 | dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
343 | { |
344 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 345 | struct segment_info *entry, *temp; |
1da177e4 LT |
346 | int rc; |
347 | ||
ded77fb4 | 348 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 349 | return -EINVAL; |
1da177e4 LT |
350 | down_write(&dcssblk_devices_sem); |
351 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
352 | if (atomic_read(&dev_info->use_count)) { | |
1da177e4 LT |
353 | rc = -EBUSY; |
354 | goto out; | |
355 | } | |
356 | if (inbuf[0] == '1') { | |
b2300b9e HY |
357 | /* reload segments in shared mode */ |
358 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
359 | rc = segment_modify_shared(entry->segment_name, | |
360 | SEGMENT_SHARED); | |
361 | if (rc < 0) { | |
362 | BUG_ON(rc == -EINVAL); | |
363 | if (rc != -EAGAIN) | |
364 | goto removeseg; | |
1da177e4 LT |
365 | } |
366 | } | |
b2300b9e HY |
367 | dev_info->is_shared = 1; |
368 | switch (dev_info->segment_type) { | |
369 | case SEG_TYPE_SR: | |
370 | case SEG_TYPE_ER: | |
371 | case SEG_TYPE_SC: | |
372 | set_disk_ro(dev_info->gd, 1); | |
373 | } | |
1da177e4 | 374 | } else if (inbuf[0] == '0') { |
b2300b9e | 375 | /* reload segments in exclusive mode */ |
1da177e4 | 376 | if (dev_info->segment_type == SEG_TYPE_SC) { |
93098bf0 HY |
377 | pr_err("DCSS %s is of type SC and cannot be " |
378 | "loaded as exclusive-writable\n", | |
379 | dev_info->segment_name); | |
1da177e4 LT |
380 | rc = -EINVAL; |
381 | goto out; | |
382 | } | |
b2300b9e HY |
383 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
384 | rc = segment_modify_shared(entry->segment_name, | |
385 | SEGMENT_EXCLUSIVE); | |
386 | if (rc < 0) { | |
387 | BUG_ON(rc == -EINVAL); | |
388 | if (rc != -EAGAIN) | |
389 | goto removeseg; | |
390 | } | |
1da177e4 | 391 | } |
b2300b9e HY |
392 | dev_info->is_shared = 0; |
393 | set_disk_ro(dev_info->gd, 0); | |
1da177e4 | 394 | } else { |
1da177e4 LT |
395 | rc = -EINVAL; |
396 | goto out; | |
397 | } | |
398 | rc = count; | |
399 | goto out; | |
400 | ||
401 | removeseg: | |
93098bf0 HY |
402 | pr_err("DCSS device %s is removed after a failed access mode " |
403 | "change\n", dev_info->segment_name); | |
b2300b9e HY |
404 | temp = entry; |
405 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
406 | if (entry != temp) | |
407 | segment_unload(entry->segment_name); | |
408 | } | |
1da177e4 LT |
409 | list_del(&dev_info->lh); |
410 | ||
411 | del_gendisk(dev_info->gd); | |
1312f40e | 412 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
413 | dev_info->gd->queue = NULL; |
414 | put_disk(dev_info->gd); | |
931bb68b | 415 | rc = device_schedule_callback(dev, dcssblk_unregister_callback); |
1da177e4 LT |
416 | out: |
417 | up_write(&dcssblk_devices_sem); | |
418 | return rc; | |
419 | } | |
420 | ||
421 | /* | |
422 | * device attribute for save operation on current copy | |
423 | * of the segment. If the segment is busy, saving will | |
424 | * become pending until it gets released, which can be | |
425 | * undone by storing a non-true value to this entry. | |
426 | * (show + store) | |
427 | */ | |
428 | static ssize_t | |
e404e274 | 429 | dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
430 | { |
431 | struct dcssblk_dev_info *dev_info; | |
432 | ||
433 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
434 | return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); | |
435 | } | |
436 | ||
437 | static ssize_t | |
e404e274 | 438 | dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
439 | { |
440 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 441 | struct segment_info *entry; |
1da177e4 | 442 | |
ded77fb4 | 443 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 444 | return -EINVAL; |
1da177e4 LT |
445 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
446 | ||
447 | down_write(&dcssblk_devices_sem); | |
448 | if (inbuf[0] == '1') { | |
449 | if (atomic_read(&dev_info->use_count) == 0) { | |
450 | // device is idle => we save immediately | |
93098bf0 HY |
451 | pr_info("All DCSSs that map to device %s are " |
452 | "saved\n", dev_info->segment_name); | |
b2300b9e HY |
453 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
454 | segment_save(entry->segment_name); | |
455 | } | |
1da177e4 LT |
456 | } else { |
457 | // device is busy => we save it when it becomes | |
458 | // idle in dcssblk_release | |
93098bf0 HY |
459 | pr_info("Device %s is in use, its DCSSs will be " |
460 | "saved when it becomes idle\n", | |
461 | dev_info->segment_name); | |
1da177e4 LT |
462 | dev_info->save_pending = 1; |
463 | } | |
464 | } else if (inbuf[0] == '0') { | |
465 | if (dev_info->save_pending) { | |
466 | // device is busy & the user wants to undo his save | |
467 | // request | |
468 | dev_info->save_pending = 0; | |
93098bf0 HY |
469 | pr_info("A pending save request for device %s " |
470 | "has been canceled\n", | |
471 | dev_info->segment_name); | |
1da177e4 LT |
472 | } |
473 | } else { | |
474 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
475 | return -EINVAL; |
476 | } | |
477 | up_write(&dcssblk_devices_sem); | |
478 | return count; | |
479 | } | |
480 | ||
b2300b9e HY |
481 | /* |
482 | * device attribute for showing all segments in a device | |
483 | */ | |
484 | static ssize_t | |
485 | dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, | |
486 | char *buf) | |
487 | { | |
488 | int i; | |
489 | ||
490 | struct dcssblk_dev_info *dev_info; | |
491 | struct segment_info *entry; | |
492 | ||
493 | down_read(&dcssblk_devices_sem); | |
494 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
495 | i = 0; | |
496 | buf[0] = '\0'; | |
497 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
498 | strcpy(&buf[i], entry->segment_name); | |
499 | i += strlen(entry->segment_name); | |
500 | buf[i] = '\n'; | |
501 | i++; | |
502 | } | |
503 | up_read(&dcssblk_devices_sem); | |
504 | return i; | |
505 | } | |
506 | ||
1da177e4 LT |
507 | /* |
508 | * device attribute for adding devices | |
509 | */ | |
510 | static ssize_t | |
e404e274 | 511 | dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 512 | { |
b2300b9e | 513 | int rc, i, j, num_of_segments; |
1da177e4 | 514 | struct dcssblk_dev_info *dev_info; |
b2300b9e | 515 | struct segment_info *seg_info, *temp; |
1da177e4 LT |
516 | char *local_buf; |
517 | unsigned long seg_byte_size; | |
518 | ||
519 | dev_info = NULL; | |
b2300b9e | 520 | seg_info = NULL; |
1da177e4 LT |
521 | if (dev != dcssblk_root_dev) { |
522 | rc = -EINVAL; | |
523 | goto out_nobuf; | |
524 | } | |
b2300b9e HY |
525 | if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { |
526 | rc = -ENAMETOOLONG; | |
527 | goto out_nobuf; | |
528 | } | |
529 | ||
1da177e4 LT |
530 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
531 | if (local_buf == NULL) { | |
532 | rc = -ENOMEM; | |
533 | goto out_nobuf; | |
534 | } | |
b2300b9e | 535 | |
1da177e4 LT |
536 | /* |
537 | * parse input | |
538 | */ | |
b2300b9e | 539 | num_of_segments = 0; |
1da177e4 | 540 | for (i = 0; ((buf[i] != '\0') && (buf[i] != '\n') && i < count); i++) { |
b2300b9e HY |
541 | for (j = i; (buf[j] != ':') && |
542 | (buf[j] != '\0') && | |
543 | (buf[j] != '\n') && | |
544 | j < count; j++) { | |
545 | local_buf[j-i] = toupper(buf[j]); | |
546 | } | |
547 | local_buf[j-i] = '\0'; | |
548 | if (((j - i) == 0) || ((j - i) > 8)) { | |
549 | rc = -ENAMETOOLONG; | |
550 | goto seg_list_del; | |
551 | } | |
552 | ||
553 | rc = dcssblk_load_segment(local_buf, &seg_info); | |
554 | if (rc < 0) | |
555 | goto seg_list_del; | |
556 | /* | |
557 | * get a struct dcssblk_dev_info | |
558 | */ | |
559 | if (num_of_segments == 0) { | |
560 | dev_info = kzalloc(sizeof(struct dcssblk_dev_info), | |
561 | GFP_KERNEL); | |
562 | if (dev_info == NULL) { | |
563 | rc = -ENOMEM; | |
564 | goto out; | |
565 | } | |
566 | strcpy(dev_info->segment_name, local_buf); | |
567 | dev_info->segment_type = seg_info->segment_type; | |
568 | INIT_LIST_HEAD(&dev_info->seg_list); | |
569 | } | |
570 | list_add_tail(&seg_info->lh, &dev_info->seg_list); | |
571 | num_of_segments++; | |
572 | i = j; | |
573 | ||
574 | if ((buf[j] == '\0') || (buf[j] == '\n')) | |
575 | break; | |
1da177e4 | 576 | } |
b2300b9e HY |
577 | |
578 | /* no trailing colon at the end of the input */ | |
579 | if ((i > 0) && (buf[i-1] == ':')) { | |
1da177e4 | 580 | rc = -ENAMETOOLONG; |
b2300b9e | 581 | goto seg_list_del; |
1da177e4 | 582 | } |
b2300b9e HY |
583 | strlcpy(local_buf, buf, i + 1); |
584 | dev_info->num_of_segments = num_of_segments; | |
585 | rc = dcssblk_is_continuous(dev_info); | |
586 | if (rc < 0) | |
587 | goto seg_list_del; | |
588 | ||
589 | dev_info->start = dcssblk_find_lowest_addr(dev_info); | |
590 | dev_info->end = dcssblk_find_highest_addr(dev_info); | |
1da177e4 | 591 | |
b2300b9e | 592 | dev_set_name(&dev_info->dev, dev_info->segment_name); |
1da177e4 LT |
593 | dev_info->dev.release = dcssblk_release_segment; |
594 | INIT_LIST_HEAD(&dev_info->lh); | |
1da177e4 LT |
595 | dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); |
596 | if (dev_info->gd == NULL) { | |
597 | rc = -ENOMEM; | |
b2300b9e | 598 | goto seg_list_del; |
1da177e4 LT |
599 | } |
600 | dev_info->gd->major = dcssblk_major; | |
601 | dev_info->gd->fops = &dcssblk_devops; | |
602 | dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); | |
603 | dev_info->gd->queue = dev_info->dcssblk_queue; | |
604 | dev_info->gd->private_data = dev_info; | |
605 | dev_info->gd->driverfs_dev = &dev_info->dev; | |
c5411dba | 606 | blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); |
e1defc4f | 607 | blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); |
b2300b9e | 608 | |
1da177e4 LT |
609 | seg_byte_size = (dev_info->end - dev_info->start + 1); |
610 | set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors | |
93098bf0 HY |
611 | pr_info("Loaded %s with total size %lu bytes and capacity %lu " |
612 | "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); | |
1da177e4 | 613 | |
1da177e4 LT |
614 | dev_info->save_pending = 0; |
615 | dev_info->is_shared = 1; | |
616 | dev_info->dev.parent = dcssblk_root_dev; | |
617 | ||
618 | /* | |
b2300b9e | 619 | *get minor, add to list |
1da177e4 LT |
620 | */ |
621 | down_write(&dcssblk_devices_sem); | |
b2300b9e | 622 | if (dcssblk_get_segment_by_name(local_buf)) { |
04f64b57 | 623 | rc = -EEXIST; |
b2300b9e | 624 | goto release_gd; |
04f64b57 | 625 | } |
1da177e4 | 626 | rc = dcssblk_assign_free_minor(dev_info); |
b2300b9e HY |
627 | if (rc) |
628 | goto release_gd; | |
1da177e4 | 629 | sprintf(dev_info->gd->disk_name, "dcssblk%d", |
d0591485 | 630 | dev_info->gd->first_minor); |
1da177e4 LT |
631 | list_add_tail(&dev_info->lh, &dcssblk_devices); |
632 | ||
633 | if (!try_module_get(THIS_MODULE)) { | |
634 | rc = -ENODEV; | |
b2300b9e | 635 | goto dev_list_del; |
1da177e4 LT |
636 | } |
637 | /* | |
638 | * register the device | |
639 | */ | |
640 | rc = device_register(&dev_info->dev); | |
641 | if (rc) { | |
1da177e4 | 642 | module_put(THIS_MODULE); |
b2300b9e | 643 | goto dev_list_del; |
1da177e4 LT |
644 | } |
645 | get_device(&dev_info->dev); | |
646 | rc = device_create_file(&dev_info->dev, &dev_attr_shared); | |
647 | if (rc) | |
648 | goto unregister_dev; | |
649 | rc = device_create_file(&dev_info->dev, &dev_attr_save); | |
b2300b9e HY |
650 | if (rc) |
651 | goto unregister_dev; | |
652 | rc = device_create_file(&dev_info->dev, &dev_attr_seglist); | |
1da177e4 LT |
653 | if (rc) |
654 | goto unregister_dev; | |
655 | ||
436d1bc7 CB |
656 | add_disk(dev_info->gd); |
657 | ||
1da177e4 LT |
658 | switch (dev_info->segment_type) { |
659 | case SEG_TYPE_SR: | |
660 | case SEG_TYPE_ER: | |
661 | case SEG_TYPE_SC: | |
662 | set_disk_ro(dev_info->gd,1); | |
663 | break; | |
664 | default: | |
665 | set_disk_ro(dev_info->gd,0); | |
666 | break; | |
667 | } | |
1da177e4 LT |
668 | up_write(&dcssblk_devices_sem); |
669 | rc = count; | |
670 | goto out; | |
671 | ||
672 | unregister_dev: | |
1da177e4 | 673 | list_del(&dev_info->lh); |
1312f40e | 674 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
675 | dev_info->gd->queue = NULL; |
676 | put_disk(dev_info->gd); | |
677 | device_unregister(&dev_info->dev); | |
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 | */ | |
727 | for (i = 0; ((*(buf+i)!='\0') && (*(buf+i)!='\n') && i < count); i++) { | |
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 | ||
6e9624b8 | 779 | lock_kernel(); |
46d74326 | 780 | dev_info = bdev->bd_disk->private_data; |
1da177e4 LT |
781 | if (NULL == dev_info) { |
782 | rc = -ENODEV; | |
783 | goto out; | |
784 | } | |
785 | atomic_inc(&dev_info->use_count); | |
46d74326 | 786 | bdev->bd_block_size = 4096; |
1da177e4 LT |
787 | rc = 0; |
788 | out: | |
6e9624b8 | 789 | unlock_kernel(); |
1da177e4 LT |
790 | return rc; |
791 | } | |
792 | ||
793 | static int | |
46d74326 | 794 | dcssblk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 795 | { |
46d74326 | 796 | struct dcssblk_dev_info *dev_info = disk->private_data; |
b2300b9e | 797 | struct segment_info *entry; |
1da177e4 LT |
798 | int rc; |
799 | ||
6e9624b8 | 800 | lock_kernel(); |
46d74326 | 801 | if (!dev_info) { |
1da177e4 LT |
802 | rc = -ENODEV; |
803 | goto out; | |
804 | } | |
805 | down_write(&dcssblk_devices_sem); | |
806 | if (atomic_dec_and_test(&dev_info->use_count) | |
807 | && (dev_info->save_pending)) { | |
93098bf0 HY |
808 | pr_info("Device %s has become idle and is being saved " |
809 | "now\n", dev_info->segment_name); | |
b2300b9e HY |
810 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
811 | segment_save(entry->segment_name); | |
812 | } | |
1da177e4 LT |
813 | dev_info->save_pending = 0; |
814 | } | |
815 | up_write(&dcssblk_devices_sem); | |
816 | rc = 0; | |
817 | out: | |
6e9624b8 | 818 | unlock_kernel(); |
1da177e4 LT |
819 | return rc; |
820 | } | |
821 | ||
822 | static int | |
165125e1 | 823 | dcssblk_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
824 | { |
825 | struct dcssblk_dev_info *dev_info; | |
826 | struct bio_vec *bvec; | |
827 | unsigned long index; | |
828 | unsigned long page_addr; | |
829 | unsigned long source_addr; | |
830 | unsigned long bytes_done; | |
831 | int i; | |
832 | ||
833 | bytes_done = 0; | |
834 | dev_info = bio->bi_bdev->bd_disk->private_data; | |
835 | if (dev_info == NULL) | |
836 | goto fail; | |
837 | if ((bio->bi_sector & 7) != 0 || (bio->bi_size & 4095) != 0) | |
838 | /* Request is not page-aligned. */ | |
839 | goto fail; | |
840 | if (((bio->bi_size >> 9) + bio->bi_sector) | |
841 | > get_capacity(bio->bi_bdev->bd_disk)) { | |
842 | /* Request beyond end of DCSS segment. */ | |
843 | goto fail; | |
844 | } | |
420edbcc CO |
845 | /* verify data transfer direction */ |
846 | if (dev_info->is_shared) { | |
847 | switch (dev_info->segment_type) { | |
848 | case SEG_TYPE_SR: | |
849 | case SEG_TYPE_ER: | |
850 | case SEG_TYPE_SC: | |
851 | /* cannot write to these segments */ | |
852 | if (bio_data_dir(bio) == WRITE) { | |
93098bf0 HY |
853 | pr_warning("Writing to %s failed because it " |
854 | "is a read-only device\n", | |
2a0217d5 | 855 | dev_name(&dev_info->dev)); |
420edbcc CO |
856 | goto fail; |
857 | } | |
858 | } | |
859 | } | |
860 | ||
1da177e4 LT |
861 | index = (bio->bi_sector >> 3); |
862 | bio_for_each_segment(bvec, bio, i) { | |
863 | page_addr = (unsigned long) | |
864 | page_address(bvec->bv_page) + bvec->bv_offset; | |
865 | source_addr = dev_info->start + (index<<12) + bytes_done; | |
39f73b28 | 866 | if (unlikely((page_addr & 4095) != 0) || (bvec->bv_len & 4095) != 0) |
1da177e4 LT |
867 | // More paranoia. |
868 | goto fail; | |
869 | if (bio_data_dir(bio) == READ) { | |
870 | memcpy((void*)page_addr, (void*)source_addr, | |
871 | bvec->bv_len); | |
872 | } else { | |
873 | memcpy((void*)source_addr, (void*)page_addr, | |
874 | bvec->bv_len); | |
875 | } | |
876 | bytes_done += bvec->bv_len; | |
877 | } | |
6712ecf8 | 878 | bio_endio(bio, 0); |
1da177e4 LT |
879 | return 0; |
880 | fail: | |
6712ecf8 | 881 | bio_io_error(bio); |
420edbcc CO |
882 | return 0; |
883 | } | |
884 | ||
885 | static int | |
886 | dcssblk_direct_access (struct block_device *bdev, sector_t secnum, | |
30afcb4b | 887 | void **kaddr, unsigned long *pfn) |
420edbcc CO |
888 | { |
889 | struct dcssblk_dev_info *dev_info; | |
890 | unsigned long pgoff; | |
891 | ||
892 | dev_info = bdev->bd_disk->private_data; | |
893 | if (!dev_info) | |
894 | return -ENODEV; | |
895 | if (secnum % (PAGE_SIZE/512)) | |
896 | return -EINVAL; | |
897 | pgoff = secnum / (PAGE_SIZE / 512); | |
898 | if ((pgoff+1)*PAGE_SIZE-1 > dev_info->end - dev_info->start) | |
899 | return -ERANGE; | |
30afcb4b JH |
900 | *kaddr = (void *) (dev_info->start+pgoff*PAGE_SIZE); |
901 | *pfn = virt_to_phys(*kaddr) >> PAGE_SHIFT; | |
902 | ||
1da177e4 LT |
903 | return 0; |
904 | } | |
905 | ||
906 | static void | |
907 | dcssblk_check_params(void) | |
908 | { | |
909 | int rc, i, j, k; | |
b2300b9e | 910 | char buf[DCSSBLK_PARM_LEN + 1]; |
1da177e4 LT |
911 | struct dcssblk_dev_info *dev_info; |
912 | ||
913 | for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); | |
914 | i++) { | |
915 | for (j = i; (dcssblk_segments[j] != ',') && | |
916 | (dcssblk_segments[j] != '\0') && | |
917 | (dcssblk_segments[j] != '(') && | |
b2300b9e | 918 | (j < DCSSBLK_PARM_LEN); j++) |
1da177e4 LT |
919 | { |
920 | buf[j-i] = dcssblk_segments[j]; | |
921 | } | |
922 | buf[j-i] = '\0'; | |
f901e5d1 | 923 | rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); |
1da177e4 | 924 | if ((rc >= 0) && (dcssblk_segments[j] == '(')) { |
b2300b9e | 925 | for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) |
1da177e4 | 926 | buf[k] = toupper(buf[k]); |
b2300b9e | 927 | buf[k] = '\0'; |
1da177e4 LT |
928 | if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { |
929 | down_read(&dcssblk_devices_sem); | |
930 | dev_info = dcssblk_get_device_by_name(buf); | |
931 | up_read(&dcssblk_devices_sem); | |
932 | if (dev_info) | |
933 | dcssblk_shared_store(&dev_info->dev, | |
f901e5d1 | 934 | NULL, "0\n", 2); |
1da177e4 LT |
935 | } |
936 | } | |
937 | while ((dcssblk_segments[j] != ',') && | |
938 | (dcssblk_segments[j] != '\0')) | |
939 | { | |
940 | j++; | |
941 | } | |
942 | if (dcssblk_segments[j] == '\0') | |
943 | break; | |
944 | i = j; | |
945 | } | |
946 | } | |
947 | ||
c369527f GS |
948 | /* |
949 | * Suspend / Resume | |
950 | */ | |
951 | static int dcssblk_freeze(struct device *dev) | |
952 | { | |
953 | struct dcssblk_dev_info *dev_info; | |
954 | int rc = 0; | |
955 | ||
956 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
957 | switch (dev_info->segment_type) { | |
958 | case SEG_TYPE_SR: | |
959 | case SEG_TYPE_ER: | |
960 | case SEG_TYPE_SC: | |
961 | if (!dev_info->is_shared) | |
962 | rc = -EINVAL; | |
963 | break; | |
964 | default: | |
965 | rc = -EINVAL; | |
966 | break; | |
967 | } | |
968 | if (rc) | |
969 | break; | |
970 | } | |
971 | if (rc) | |
2c48c4d6 CB |
972 | pr_err("Suspending the system failed because DCSS device %s " |
973 | "is writable\n", | |
c369527f GS |
974 | dev_info->segment_name); |
975 | return rc; | |
976 | } | |
977 | ||
978 | static int dcssblk_restore(struct device *dev) | |
979 | { | |
980 | struct dcssblk_dev_info *dev_info; | |
981 | struct segment_info *entry; | |
982 | unsigned long start, end; | |
983 | int rc = 0; | |
984 | ||
985 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
986 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
987 | segment_unload(entry->segment_name); | |
988 | rc = segment_load(entry->segment_name, SEGMENT_SHARED, | |
989 | &start, &end); | |
990 | if (rc < 0) { | |
991 | // TODO in_use check ? | |
992 | segment_warning(rc, entry->segment_name); | |
993 | goto out_panic; | |
994 | } | |
995 | if (start != entry->start || end != entry->end) { | |
2c48c4d6 CB |
996 | pr_err("The address range of DCSS %s changed " |
997 | "while the system was suspended\n", | |
c369527f GS |
998 | entry->segment_name); |
999 | goto out_panic; | |
1000 | } | |
1001 | } | |
1002 | } | |
1003 | return 0; | |
1004 | out_panic: | |
1005 | panic("fatal dcssblk resume error\n"); | |
1006 | } | |
1007 | ||
1008 | static int dcssblk_thaw(struct device *dev) | |
1009 | { | |
1010 | return 0; | |
1011 | } | |
1012 | ||
47145210 | 1013 | static const struct dev_pm_ops dcssblk_pm_ops = { |
c369527f GS |
1014 | .freeze = dcssblk_freeze, |
1015 | .thaw = dcssblk_thaw, | |
1016 | .restore = dcssblk_restore, | |
1017 | }; | |
1018 | ||
1019 | static struct platform_driver dcssblk_pdrv = { | |
1020 | .driver = { | |
1021 | .name = "dcssblk", | |
1022 | .owner = THIS_MODULE, | |
1023 | .pm = &dcssblk_pm_ops, | |
1024 | }, | |
1025 | }; | |
1026 | ||
1027 | static struct platform_device *dcssblk_pdev; | |
1028 | ||
1029 | ||
1da177e4 LT |
1030 | /* |
1031 | * The init/exit functions. | |
1032 | */ | |
1033 | static void __exit | |
1034 | dcssblk_exit(void) | |
1035 | { | |
c369527f GS |
1036 | platform_device_unregister(dcssblk_pdev); |
1037 | platform_driver_unregister(&dcssblk_pdrv); | |
035da16f | 1038 | root_device_unregister(dcssblk_root_dev); |
00d59405 | 1039 | unregister_blkdev(dcssblk_major, DCSSBLK_NAME); |
1da177e4 LT |
1040 | } |
1041 | ||
1042 | static int __init | |
1043 | dcssblk_init(void) | |
1044 | { | |
1045 | int rc; | |
1046 | ||
c369527f GS |
1047 | rc = platform_driver_register(&dcssblk_pdrv); |
1048 | if (rc) | |
1da177e4 | 1049 | return rc; |
c369527f GS |
1050 | |
1051 | dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL, | |
1052 | 0); | |
1053 | if (IS_ERR(dcssblk_pdev)) { | |
1054 | rc = PTR_ERR(dcssblk_pdev); | |
1055 | goto out_pdrv; | |
1da177e4 | 1056 | } |
c369527f GS |
1057 | |
1058 | dcssblk_root_dev = root_device_register("dcssblk"); | |
1059 | if (IS_ERR(dcssblk_root_dev)) { | |
1060 | rc = PTR_ERR(dcssblk_root_dev); | |
1061 | goto out_pdev; | |
1da177e4 | 1062 | } |
c369527f GS |
1063 | rc = device_create_file(dcssblk_root_dev, &dev_attr_add); |
1064 | if (rc) | |
1065 | goto out_root; | |
1066 | rc = device_create_file(dcssblk_root_dev, &dev_attr_remove); | |
1067 | if (rc) | |
1068 | goto out_root; | |
1da177e4 | 1069 | rc = register_blkdev(0, DCSSBLK_NAME); |
c369527f GS |
1070 | if (rc < 0) |
1071 | goto out_root; | |
1da177e4 LT |
1072 | dcssblk_major = rc; |
1073 | init_rwsem(&dcssblk_devices_sem); | |
1074 | ||
1075 | dcssblk_check_params(); | |
1da177e4 | 1076 | return 0; |
c369527f GS |
1077 | |
1078 | out_root: | |
1079 | root_device_unregister(dcssblk_root_dev); | |
1080 | out_pdev: | |
1081 | platform_device_unregister(dcssblk_pdev); | |
1082 | out_pdrv: | |
1083 | platform_driver_unregister(&dcssblk_pdrv); | |
1084 | return rc; | |
1da177e4 LT |
1085 | } |
1086 | ||
1087 | module_init(dcssblk_init); | |
1088 | module_exit(dcssblk_exit); | |
1089 | ||
1090 | module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); | |
1091 | MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " | |
b2300b9e HY |
1092 | "comma-separated list, names in each set separated " |
1093 | "by commas are separated by colons, each set contains " | |
1094 | "names of contiguous segments and each name max. 8 chars.\n" | |
1095 | "Adding \"(local)\" to the end of each set equals echoing 0 " | |
1096 | "to /sys/devices/dcssblk/<device name>/shared after loading " | |
1097 | "the contiguous segments - \n" | |
1098 | "e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\""); | |
1da177e4 LT |
1099 | |
1100 | MODULE_LICENSE("GPL"); |