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); |
5a7bbad2 | 30 | static void dcssblk_make_request(struct request_queue *q, struct bio *bio); |
dd22f551 | 31 | static long dcssblk_direct_access(struct block_device *bdev, sector_t secnum, |
cb389b9c | 32 | void __pmem **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); |
1da177e4 LT |
72 | |
73 | static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); | |
74 | static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); | |
1da177e4 LT |
75 | |
76 | static struct device *dcssblk_root_dev; | |
77 | ||
c11ca97e | 78 | static LIST_HEAD(dcssblk_devices); |
1da177e4 LT |
79 | static struct rw_semaphore dcssblk_devices_sem; |
80 | ||
81 | /* | |
82 | * release function for segment device. | |
83 | */ | |
84 | static void | |
85 | dcssblk_release_segment(struct device *dev) | |
86 | { | |
b2300b9e HY |
87 | struct dcssblk_dev_info *dev_info; |
88 | struct segment_info *entry, *temp; | |
89 | ||
90 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
91 | list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { | |
92 | list_del(&entry->lh); | |
93 | kfree(entry); | |
94 | } | |
95 | kfree(dev_info); | |
1da177e4 LT |
96 | module_put(THIS_MODULE); |
97 | } | |
98 | ||
99 | /* | |
100 | * get a minor number. needs to be called with | |
101 | * down_write(&dcssblk_devices_sem) and the | |
102 | * device needs to be enqueued before the semaphore is | |
103 | * freed. | |
104 | */ | |
4d284cac | 105 | static int |
1da177e4 LT |
106 | dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) |
107 | { | |
108 | int minor, found; | |
109 | struct dcssblk_dev_info *entry; | |
110 | ||
111 | if (dev_info == NULL) | |
112 | return -EINVAL; | |
113 | for (minor = 0; minor < (1<<MINORBITS); minor++) { | |
114 | found = 0; | |
115 | // test if minor available | |
116 | list_for_each_entry(entry, &dcssblk_devices, lh) | |
d0591485 | 117 | if (minor == entry->gd->first_minor) |
1da177e4 LT |
118 | found++; |
119 | if (!found) break; // got unused minor | |
120 | } | |
121 | if (found) | |
122 | return -EBUSY; | |
123 | dev_info->gd->first_minor = minor; | |
124 | return 0; | |
125 | } | |
126 | ||
127 | /* | |
128 | * get the struct dcssblk_dev_info from dcssblk_devices | |
129 | * for the given name. | |
130 | * down_read(&dcssblk_devices_sem) must be held. | |
131 | */ | |
132 | static struct dcssblk_dev_info * | |
133 | dcssblk_get_device_by_name(char *name) | |
134 | { | |
135 | struct dcssblk_dev_info *entry; | |
136 | ||
137 | list_for_each_entry(entry, &dcssblk_devices, lh) { | |
138 | if (!strcmp(name, entry->segment_name)) { | |
139 | return entry; | |
140 | } | |
141 | } | |
142 | return NULL; | |
143 | } | |
144 | ||
b2300b9e HY |
145 | /* |
146 | * get the struct segment_info from seg_list | |
147 | * for the given name. | |
148 | * down_read(&dcssblk_devices_sem) must be held. | |
149 | */ | |
150 | static struct segment_info * | |
151 | dcssblk_get_segment_by_name(char *name) | |
152 | { | |
153 | struct dcssblk_dev_info *dev_info; | |
154 | struct segment_info *entry; | |
155 | ||
156 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
157 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
158 | if (!strcmp(name, entry->segment_name)) | |
159 | return entry; | |
160 | } | |
161 | } | |
162 | return NULL; | |
163 | } | |
164 | ||
165 | /* | |
166 | * get the highest address of the multi-segment block. | |
167 | */ | |
168 | static unsigned long | |
169 | dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) | |
170 | { | |
171 | unsigned long highest_addr; | |
172 | struct segment_info *entry; | |
173 | ||
174 | highest_addr = 0; | |
175 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
176 | if (highest_addr < entry->end) | |
177 | highest_addr = entry->end; | |
178 | } | |
179 | return highest_addr; | |
180 | } | |
181 | ||
182 | /* | |
183 | * get the lowest address of the multi-segment block. | |
184 | */ | |
185 | static unsigned long | |
186 | dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) | |
187 | { | |
188 | int set_first; | |
189 | unsigned long lowest_addr; | |
190 | struct segment_info *entry; | |
191 | ||
192 | set_first = 0; | |
193 | lowest_addr = 0; | |
194 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
195 | if (set_first == 0) { | |
196 | lowest_addr = entry->start; | |
197 | set_first = 1; | |
198 | } else { | |
199 | if (lowest_addr > entry->start) | |
200 | lowest_addr = entry->start; | |
201 | } | |
202 | } | |
203 | return lowest_addr; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Check continuity of segments. | |
208 | */ | |
209 | static int | |
210 | dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) | |
211 | { | |
212 | int i, j, rc; | |
213 | struct segment_info *sort_list, *entry, temp; | |
214 | ||
215 | if (dev_info->num_of_segments <= 1) | |
216 | return 0; | |
217 | ||
218 | sort_list = kzalloc( | |
219 | sizeof(struct segment_info) * dev_info->num_of_segments, | |
220 | GFP_KERNEL); | |
221 | if (sort_list == NULL) | |
222 | return -ENOMEM; | |
223 | i = 0; | |
224 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
225 | memcpy(&sort_list[i], entry, sizeof(struct segment_info)); | |
226 | i++; | |
227 | } | |
228 | ||
229 | /* sort segments */ | |
230 | for (i = 0; i < dev_info->num_of_segments; i++) | |
231 | for (j = 0; j < dev_info->num_of_segments; j++) | |
232 | if (sort_list[j].start > sort_list[i].start) { | |
233 | memcpy(&temp, &sort_list[i], | |
234 | sizeof(struct segment_info)); | |
235 | memcpy(&sort_list[i], &sort_list[j], | |
236 | sizeof(struct segment_info)); | |
237 | memcpy(&sort_list[j], &temp, | |
238 | sizeof(struct segment_info)); | |
239 | } | |
240 | ||
241 | /* check continuity */ | |
242 | for (i = 0; i < dev_info->num_of_segments - 1; i++) { | |
243 | if ((sort_list[i].end + 1) != sort_list[i+1].start) { | |
93098bf0 HY |
244 | pr_err("Adjacent DCSSs %s and %s are not " |
245 | "contiguous\n", sort_list[i].segment_name, | |
246 | sort_list[i+1].segment_name); | |
b2300b9e HY |
247 | rc = -EINVAL; |
248 | goto out; | |
249 | } | |
250 | /* EN and EW are allowed in a block device */ | |
251 | if (sort_list[i].segment_type != sort_list[i+1].segment_type) { | |
252 | if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || | |
253 | (sort_list[i].segment_type == SEG_TYPE_ER) || | |
254 | !(sort_list[i+1].segment_type & | |
255 | SEGMENT_EXCLUSIVE) || | |
256 | (sort_list[i+1].segment_type == SEG_TYPE_ER)) { | |
93098bf0 HY |
257 | pr_err("DCSS %s and DCSS %s have " |
258 | "incompatible types\n", | |
259 | sort_list[i].segment_name, | |
260 | sort_list[i+1].segment_name); | |
b2300b9e HY |
261 | rc = -EINVAL; |
262 | goto out; | |
263 | } | |
264 | } | |
265 | } | |
266 | rc = 0; | |
267 | out: | |
268 | kfree(sort_list); | |
269 | return rc; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Load a segment | |
274 | */ | |
275 | static int | |
276 | dcssblk_load_segment(char *name, struct segment_info **seg_info) | |
277 | { | |
278 | int rc; | |
279 | ||
280 | /* already loaded? */ | |
281 | down_read(&dcssblk_devices_sem); | |
282 | *seg_info = dcssblk_get_segment_by_name(name); | |
283 | up_read(&dcssblk_devices_sem); | |
284 | if (*seg_info != NULL) | |
285 | return -EEXIST; | |
286 | ||
287 | /* get a struct segment_info */ | |
288 | *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); | |
289 | if (*seg_info == NULL) | |
290 | return -ENOMEM; | |
291 | ||
292 | strcpy((*seg_info)->segment_name, name); | |
293 | ||
294 | /* load the segment */ | |
295 | rc = segment_load(name, SEGMENT_SHARED, | |
296 | &(*seg_info)->start, &(*seg_info)->end); | |
297 | if (rc < 0) { | |
298 | segment_warning(rc, (*seg_info)->segment_name); | |
299 | kfree(*seg_info); | |
300 | } else { | |
301 | INIT_LIST_HEAD(&(*seg_info)->lh); | |
302 | (*seg_info)->segment_type = rc; | |
303 | } | |
304 | return rc; | |
305 | } | |
306 | ||
1da177e4 LT |
307 | /* |
308 | * device attribute for switching shared/nonshared (exclusive) | |
309 | * operation (show + store) | |
310 | */ | |
311 | static ssize_t | |
e404e274 | 312 | dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
313 | { |
314 | struct dcssblk_dev_info *dev_info; | |
315 | ||
316 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
317 | return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); | |
318 | } | |
319 | ||
320 | static ssize_t | |
e404e274 | 321 | dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
322 | { |
323 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 324 | struct segment_info *entry, *temp; |
1da177e4 LT |
325 | int rc; |
326 | ||
ded77fb4 | 327 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 328 | return -EINVAL; |
1da177e4 LT |
329 | down_write(&dcssblk_devices_sem); |
330 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
331 | if (atomic_read(&dev_info->use_count)) { | |
1da177e4 LT |
332 | rc = -EBUSY; |
333 | goto out; | |
334 | } | |
335 | if (inbuf[0] == '1') { | |
b2300b9e HY |
336 | /* reload segments in shared mode */ |
337 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
338 | rc = segment_modify_shared(entry->segment_name, | |
339 | SEGMENT_SHARED); | |
340 | if (rc < 0) { | |
341 | BUG_ON(rc == -EINVAL); | |
342 | if (rc != -EAGAIN) | |
343 | goto removeseg; | |
1da177e4 LT |
344 | } |
345 | } | |
b2300b9e HY |
346 | dev_info->is_shared = 1; |
347 | switch (dev_info->segment_type) { | |
348 | case SEG_TYPE_SR: | |
349 | case SEG_TYPE_ER: | |
350 | case SEG_TYPE_SC: | |
351 | set_disk_ro(dev_info->gd, 1); | |
352 | } | |
1da177e4 | 353 | } else if (inbuf[0] == '0') { |
b2300b9e | 354 | /* reload segments in exclusive mode */ |
1da177e4 | 355 | if (dev_info->segment_type == SEG_TYPE_SC) { |
93098bf0 HY |
356 | pr_err("DCSS %s is of type SC and cannot be " |
357 | "loaded as exclusive-writable\n", | |
358 | dev_info->segment_name); | |
1da177e4 LT |
359 | rc = -EINVAL; |
360 | goto out; | |
361 | } | |
b2300b9e HY |
362 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
363 | rc = segment_modify_shared(entry->segment_name, | |
364 | SEGMENT_EXCLUSIVE); | |
365 | if (rc < 0) { | |
366 | BUG_ON(rc == -EINVAL); | |
367 | if (rc != -EAGAIN) | |
368 | goto removeseg; | |
369 | } | |
1da177e4 | 370 | } |
b2300b9e HY |
371 | dev_info->is_shared = 0; |
372 | set_disk_ro(dev_info->gd, 0); | |
1da177e4 | 373 | } else { |
1da177e4 LT |
374 | rc = -EINVAL; |
375 | goto out; | |
376 | } | |
377 | rc = count; | |
378 | goto out; | |
379 | ||
380 | removeseg: | |
93098bf0 HY |
381 | pr_err("DCSS device %s is removed after a failed access mode " |
382 | "change\n", dev_info->segment_name); | |
b2300b9e HY |
383 | temp = entry; |
384 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
385 | if (entry != temp) | |
386 | segment_unload(entry->segment_name); | |
387 | } | |
1da177e4 LT |
388 | list_del(&dev_info->lh); |
389 | ||
390 | del_gendisk(dev_info->gd); | |
1312f40e | 391 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
392 | dev_info->gd->queue = NULL; |
393 | put_disk(dev_info->gd); | |
0b60f9ea TH |
394 | up_write(&dcssblk_devices_sem); |
395 | ||
396 | if (device_remove_file_self(dev, attr)) { | |
397 | device_unregister(dev); | |
398 | put_device(dev); | |
399 | } | |
400 | return rc; | |
1da177e4 LT |
401 | out: |
402 | up_write(&dcssblk_devices_sem); | |
403 | return rc; | |
404 | } | |
521b3d79 SO |
405 | static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, |
406 | dcssblk_shared_store); | |
1da177e4 LT |
407 | |
408 | /* | |
409 | * device attribute for save operation on current copy | |
410 | * of the segment. If the segment is busy, saving will | |
411 | * become pending until it gets released, which can be | |
412 | * undone by storing a non-true value to this entry. | |
413 | * (show + store) | |
414 | */ | |
415 | static ssize_t | |
e404e274 | 416 | dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
417 | { |
418 | struct dcssblk_dev_info *dev_info; | |
419 | ||
420 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
421 | return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); | |
422 | } | |
423 | ||
424 | static ssize_t | |
e404e274 | 425 | dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
426 | { |
427 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 428 | struct segment_info *entry; |
1da177e4 | 429 | |
ded77fb4 | 430 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 431 | return -EINVAL; |
1da177e4 LT |
432 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
433 | ||
434 | down_write(&dcssblk_devices_sem); | |
435 | if (inbuf[0] == '1') { | |
436 | if (atomic_read(&dev_info->use_count) == 0) { | |
437 | // device is idle => we save immediately | |
93098bf0 HY |
438 | pr_info("All DCSSs that map to device %s are " |
439 | "saved\n", dev_info->segment_name); | |
b2300b9e | 440 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
441 | if (entry->segment_type == SEG_TYPE_EN || |
442 | entry->segment_type == SEG_TYPE_SN) | |
443 | pr_warn("DCSS %s is of type SN or EN" | |
444 | " and cannot be saved\n", | |
445 | entry->segment_name); | |
446 | else | |
447 | segment_save(entry->segment_name); | |
b2300b9e | 448 | } |
1da177e4 LT |
449 | } else { |
450 | // device is busy => we save it when it becomes | |
451 | // idle in dcssblk_release | |
93098bf0 HY |
452 | pr_info("Device %s is in use, its DCSSs will be " |
453 | "saved when it becomes idle\n", | |
454 | dev_info->segment_name); | |
1da177e4 LT |
455 | dev_info->save_pending = 1; |
456 | } | |
457 | } else if (inbuf[0] == '0') { | |
458 | if (dev_info->save_pending) { | |
459 | // device is busy & the user wants to undo his save | |
460 | // request | |
461 | dev_info->save_pending = 0; | |
93098bf0 HY |
462 | pr_info("A pending save request for device %s " |
463 | "has been canceled\n", | |
464 | dev_info->segment_name); | |
1da177e4 LT |
465 | } |
466 | } else { | |
467 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
468 | return -EINVAL; |
469 | } | |
470 | up_write(&dcssblk_devices_sem); | |
471 | return count; | |
472 | } | |
521b3d79 SO |
473 | static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, |
474 | dcssblk_save_store); | |
1da177e4 | 475 | |
b2300b9e HY |
476 | /* |
477 | * device attribute for showing all segments in a device | |
478 | */ | |
479 | static ssize_t | |
480 | dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, | |
481 | char *buf) | |
482 | { | |
483 | int i; | |
484 | ||
485 | struct dcssblk_dev_info *dev_info; | |
486 | struct segment_info *entry; | |
487 | ||
488 | down_read(&dcssblk_devices_sem); | |
489 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
490 | i = 0; | |
491 | buf[0] = '\0'; | |
492 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
493 | strcpy(&buf[i], entry->segment_name); | |
494 | i += strlen(entry->segment_name); | |
495 | buf[i] = '\n'; | |
496 | i++; | |
497 | } | |
498 | up_read(&dcssblk_devices_sem); | |
499 | return i; | |
500 | } | |
521b3d79 SO |
501 | static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); |
502 | ||
503 | static struct attribute *dcssblk_dev_attrs[] = { | |
504 | &dev_attr_shared.attr, | |
505 | &dev_attr_save.attr, | |
506 | &dev_attr_seglist.attr, | |
507 | NULL, | |
508 | }; | |
509 | static struct attribute_group dcssblk_dev_attr_group = { | |
510 | .attrs = dcssblk_dev_attrs, | |
511 | }; | |
512 | static const struct attribute_group *dcssblk_dev_attr_groups[] = { | |
513 | &dcssblk_dev_attr_group, | |
514 | NULL, | |
515 | }; | |
b2300b9e | 516 | |
1da177e4 LT |
517 | /* |
518 | * device attribute for adding devices | |
519 | */ | |
520 | static ssize_t | |
e404e274 | 521 | dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 522 | { |
b2300b9e | 523 | int rc, i, j, num_of_segments; |
1da177e4 | 524 | struct dcssblk_dev_info *dev_info; |
b2300b9e | 525 | struct segment_info *seg_info, *temp; |
1da177e4 LT |
526 | char *local_buf; |
527 | unsigned long seg_byte_size; | |
528 | ||
529 | dev_info = NULL; | |
b2300b9e | 530 | seg_info = NULL; |
1da177e4 LT |
531 | if (dev != dcssblk_root_dev) { |
532 | rc = -EINVAL; | |
533 | goto out_nobuf; | |
534 | } | |
b2300b9e HY |
535 | if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { |
536 | rc = -ENAMETOOLONG; | |
537 | goto out_nobuf; | |
538 | } | |
539 | ||
1da177e4 LT |
540 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
541 | if (local_buf == NULL) { | |
542 | rc = -ENOMEM; | |
543 | goto out_nobuf; | |
544 | } | |
b2300b9e | 545 | |
1da177e4 LT |
546 | /* |
547 | * parse input | |
548 | */ | |
b2300b9e | 549 | num_of_segments = 0; |
3a9f9183 | 550 | for (i = 0; (i < count && (buf[i] != '\0') && (buf[i] != '\n')); i++) { |
42cfc6b5 MS |
551 | for (j = i; j < count && |
552 | (buf[j] != ':') && | |
b2300b9e | 553 | (buf[j] != '\0') && |
42cfc6b5 | 554 | (buf[j] != '\n'); j++) { |
b2300b9e HY |
555 | local_buf[j-i] = toupper(buf[j]); |
556 | } | |
557 | local_buf[j-i] = '\0'; | |
558 | if (((j - i) == 0) || ((j - i) > 8)) { | |
559 | rc = -ENAMETOOLONG; | |
560 | goto seg_list_del; | |
561 | } | |
562 | ||
563 | rc = dcssblk_load_segment(local_buf, &seg_info); | |
564 | if (rc < 0) | |
565 | goto seg_list_del; | |
566 | /* | |
567 | * get a struct dcssblk_dev_info | |
568 | */ | |
569 | if (num_of_segments == 0) { | |
570 | dev_info = kzalloc(sizeof(struct dcssblk_dev_info), | |
571 | GFP_KERNEL); | |
572 | if (dev_info == NULL) { | |
573 | rc = -ENOMEM; | |
574 | goto out; | |
575 | } | |
576 | strcpy(dev_info->segment_name, local_buf); | |
577 | dev_info->segment_type = seg_info->segment_type; | |
578 | INIT_LIST_HEAD(&dev_info->seg_list); | |
579 | } | |
580 | list_add_tail(&seg_info->lh, &dev_info->seg_list); | |
581 | num_of_segments++; | |
582 | i = j; | |
583 | ||
584 | if ((buf[j] == '\0') || (buf[j] == '\n')) | |
585 | break; | |
1da177e4 | 586 | } |
b2300b9e HY |
587 | |
588 | /* no trailing colon at the end of the input */ | |
589 | if ((i > 0) && (buf[i-1] == ':')) { | |
1da177e4 | 590 | rc = -ENAMETOOLONG; |
b2300b9e | 591 | goto seg_list_del; |
1da177e4 | 592 | } |
b2300b9e HY |
593 | strlcpy(local_buf, buf, i + 1); |
594 | dev_info->num_of_segments = num_of_segments; | |
595 | rc = dcssblk_is_continuous(dev_info); | |
596 | if (rc < 0) | |
597 | goto seg_list_del; | |
598 | ||
599 | dev_info->start = dcssblk_find_lowest_addr(dev_info); | |
600 | dev_info->end = dcssblk_find_highest_addr(dev_info); | |
1da177e4 | 601 | |
ef283688 | 602 | dev_set_name(&dev_info->dev, "%s", dev_info->segment_name); |
1da177e4 | 603 | dev_info->dev.release = dcssblk_release_segment; |
521b3d79 | 604 | dev_info->dev.groups = dcssblk_dev_attr_groups; |
1da177e4 | 605 | INIT_LIST_HEAD(&dev_info->lh); |
1da177e4 LT |
606 | dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); |
607 | if (dev_info->gd == NULL) { | |
608 | rc = -ENOMEM; | |
b2300b9e | 609 | goto seg_list_del; |
1da177e4 LT |
610 | } |
611 | dev_info->gd->major = dcssblk_major; | |
612 | dev_info->gd->fops = &dcssblk_devops; | |
613 | dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); | |
614 | dev_info->gd->queue = dev_info->dcssblk_queue; | |
615 | dev_info->gd->private_data = dev_info; | |
616 | dev_info->gd->driverfs_dev = &dev_info->dev; | |
c5411dba | 617 | blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); |
e1defc4f | 618 | blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); |
b2300b9e | 619 | |
1da177e4 LT |
620 | seg_byte_size = (dev_info->end - dev_info->start + 1); |
621 | set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors | |
93098bf0 HY |
622 | pr_info("Loaded %s with total size %lu bytes and capacity %lu " |
623 | "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); | |
1da177e4 | 624 | |
1da177e4 LT |
625 | dev_info->save_pending = 0; |
626 | dev_info->is_shared = 1; | |
627 | dev_info->dev.parent = dcssblk_root_dev; | |
628 | ||
629 | /* | |
b2300b9e | 630 | *get minor, add to list |
1da177e4 LT |
631 | */ |
632 | down_write(&dcssblk_devices_sem); | |
b2300b9e | 633 | if (dcssblk_get_segment_by_name(local_buf)) { |
04f64b57 | 634 | rc = -EEXIST; |
b2300b9e | 635 | goto release_gd; |
04f64b57 | 636 | } |
1da177e4 | 637 | rc = dcssblk_assign_free_minor(dev_info); |
b2300b9e HY |
638 | if (rc) |
639 | goto release_gd; | |
1da177e4 | 640 | sprintf(dev_info->gd->disk_name, "dcssblk%d", |
d0591485 | 641 | dev_info->gd->first_minor); |
1da177e4 LT |
642 | list_add_tail(&dev_info->lh, &dcssblk_devices); |
643 | ||
644 | if (!try_module_get(THIS_MODULE)) { | |
645 | rc = -ENODEV; | |
b2300b9e | 646 | goto dev_list_del; |
1da177e4 LT |
647 | } |
648 | /* | |
649 | * register the device | |
650 | */ | |
651 | rc = device_register(&dev_info->dev); | |
b2300b9e | 652 | if (rc) |
521b3d79 | 653 | goto put_dev; |
1da177e4 | 654 | |
521b3d79 | 655 | get_device(&dev_info->dev); |
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 | ||
521b3d79 | 672 | put_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); | |
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 | */ | |
42cfc6b5 | 726 | for (i = 0; (i < count && (*(buf+i)!='\0') && (*(buf+i)!='\n')); i++) { |
1da177e4 LT |
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 | ||
db2a144b | 790 | static void |
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 | 795 | |
46d74326 | 796 | if (!dev_info) { |
db2a144b AV |
797 | WARN_ON(1); |
798 | return; | |
1da177e4 LT |
799 | } |
800 | down_write(&dcssblk_devices_sem); | |
801 | if (atomic_dec_and_test(&dev_info->use_count) | |
802 | && (dev_info->save_pending)) { | |
93098bf0 HY |
803 | pr_info("Device %s has become idle and is being saved " |
804 | "now\n", dev_info->segment_name); | |
b2300b9e | 805 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
806 | if (entry->segment_type == SEG_TYPE_EN || |
807 | entry->segment_type == SEG_TYPE_SN) | |
808 | pr_warn("DCSS %s is of type SN or EN and cannot" | |
809 | " be saved\n", entry->segment_name); | |
810 | else | |
811 | segment_save(entry->segment_name); | |
b2300b9e | 812 | } |
1da177e4 LT |
813 | dev_info->save_pending = 0; |
814 | } | |
815 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
816 | } |
817 | ||
5a7bbad2 | 818 | static void |
165125e1 | 819 | dcssblk_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
820 | { |
821 | struct dcssblk_dev_info *dev_info; | |
7988613b KO |
822 | struct bio_vec bvec; |
823 | struct bvec_iter iter; | |
1da177e4 LT |
824 | unsigned long index; |
825 | unsigned long page_addr; | |
826 | unsigned long source_addr; | |
827 | unsigned long bytes_done; | |
1da177e4 | 828 | |
54efd50b KO |
829 | blk_queue_split(q, &bio, q->bio_split); |
830 | ||
1da177e4 LT |
831 | bytes_done = 0; |
832 | dev_info = bio->bi_bdev->bd_disk->private_data; | |
833 | if (dev_info == NULL) | |
834 | goto fail; | |
4f024f37 KO |
835 | if ((bio->bi_iter.bi_sector & 7) != 0 || |
836 | (bio->bi_iter.bi_size & 4095) != 0) | |
1da177e4 LT |
837 | /* Request is not page-aligned. */ |
838 | goto fail; | |
f73a1c7d | 839 | if (bio_end_sector(bio) > get_capacity(bio->bi_bdev->bd_disk)) { |
1da177e4 LT |
840 | /* Request beyond end of DCSS segment. */ |
841 | goto fail; | |
842 | } | |
420edbcc CO |
843 | /* verify data transfer direction */ |
844 | if (dev_info->is_shared) { | |
845 | switch (dev_info->segment_type) { | |
846 | case SEG_TYPE_SR: | |
847 | case SEG_TYPE_ER: | |
848 | case SEG_TYPE_SC: | |
849 | /* cannot write to these segments */ | |
850 | if (bio_data_dir(bio) == WRITE) { | |
93098bf0 HY |
851 | pr_warning("Writing to %s failed because it " |
852 | "is a read-only device\n", | |
2a0217d5 | 853 | dev_name(&dev_info->dev)); |
420edbcc CO |
854 | goto fail; |
855 | } | |
856 | } | |
857 | } | |
858 | ||
4f024f37 | 859 | index = (bio->bi_iter.bi_sector >> 3); |
7988613b | 860 | bio_for_each_segment(bvec, bio, iter) { |
1da177e4 | 861 | page_addr = (unsigned long) |
7988613b | 862 | page_address(bvec.bv_page) + bvec.bv_offset; |
1da177e4 | 863 | source_addr = dev_info->start + (index<<12) + bytes_done; |
7988613b | 864 | if (unlikely((page_addr & 4095) != 0) || (bvec.bv_len & 4095) != 0) |
1da177e4 LT |
865 | // More paranoia. |
866 | goto fail; | |
867 | if (bio_data_dir(bio) == READ) { | |
868 | memcpy((void*)page_addr, (void*)source_addr, | |
7988613b | 869 | bvec.bv_len); |
1da177e4 LT |
870 | } else { |
871 | memcpy((void*)source_addr, (void*)page_addr, | |
7988613b | 872 | bvec.bv_len); |
1da177e4 | 873 | } |
7988613b | 874 | bytes_done += bvec.bv_len; |
1da177e4 | 875 | } |
4246a0b6 | 876 | bio_endio(bio); |
5a7bbad2 | 877 | return; |
1da177e4 | 878 | fail: |
6712ecf8 | 879 | bio_io_error(bio); |
420edbcc CO |
880 | } |
881 | ||
dd22f551 | 882 | static long |
420edbcc | 883 | dcssblk_direct_access (struct block_device *bdev, sector_t secnum, |
cb389b9c | 884 | void __pmem **kaddr, unsigned long *pfn) |
420edbcc CO |
885 | { |
886 | struct dcssblk_dev_info *dev_info; | |
dd22f551 | 887 | unsigned long offset, dev_sz; |
e2e05394 | 888 | void *addr; |
420edbcc CO |
889 | |
890 | dev_info = bdev->bd_disk->private_data; | |
891 | if (!dev_info) | |
892 | return -ENODEV; | |
dd22f551 MW |
893 | dev_sz = dev_info->end - dev_info->start; |
894 | offset = secnum * 512; | |
e2e05394 RZ |
895 | addr = (void *) (dev_info->start + offset); |
896 | *pfn = virt_to_phys(addr) >> PAGE_SHIFT; | |
897 | *kaddr = (void __pmem *) addr; | |
30afcb4b | 898 | |
dd22f551 | 899 | return dev_sz - offset; |
1da177e4 LT |
900 | } |
901 | ||
902 | static void | |
903 | dcssblk_check_params(void) | |
904 | { | |
905 | int rc, i, j, k; | |
b2300b9e | 906 | char buf[DCSSBLK_PARM_LEN + 1]; |
1da177e4 LT |
907 | struct dcssblk_dev_info *dev_info; |
908 | ||
909 | for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); | |
910 | i++) { | |
42cfc6b5 MS |
911 | for (j = i; (j < DCSSBLK_PARM_LEN) && |
912 | (dcssblk_segments[j] != ',') && | |
1da177e4 | 913 | (dcssblk_segments[j] != '\0') && |
42cfc6b5 | 914 | (dcssblk_segments[j] != '('); j++) |
1da177e4 LT |
915 | { |
916 | buf[j-i] = dcssblk_segments[j]; | |
917 | } | |
918 | buf[j-i] = '\0'; | |
f901e5d1 | 919 | rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); |
1da177e4 | 920 | if ((rc >= 0) && (dcssblk_segments[j] == '(')) { |
b2300b9e | 921 | for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) |
1da177e4 | 922 | buf[k] = toupper(buf[k]); |
b2300b9e | 923 | buf[k] = '\0'; |
1da177e4 LT |
924 | if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { |
925 | down_read(&dcssblk_devices_sem); | |
926 | dev_info = dcssblk_get_device_by_name(buf); | |
927 | up_read(&dcssblk_devices_sem); | |
928 | if (dev_info) | |
929 | dcssblk_shared_store(&dev_info->dev, | |
f901e5d1 | 930 | NULL, "0\n", 2); |
1da177e4 LT |
931 | } |
932 | } | |
933 | while ((dcssblk_segments[j] != ',') && | |
934 | (dcssblk_segments[j] != '\0')) | |
935 | { | |
936 | j++; | |
937 | } | |
938 | if (dcssblk_segments[j] == '\0') | |
939 | break; | |
940 | i = j; | |
941 | } | |
942 | } | |
943 | ||
c369527f GS |
944 | /* |
945 | * Suspend / Resume | |
946 | */ | |
947 | static int dcssblk_freeze(struct device *dev) | |
948 | { | |
949 | struct dcssblk_dev_info *dev_info; | |
950 | int rc = 0; | |
951 | ||
952 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
953 | switch (dev_info->segment_type) { | |
954 | case SEG_TYPE_SR: | |
955 | case SEG_TYPE_ER: | |
956 | case SEG_TYPE_SC: | |
957 | if (!dev_info->is_shared) | |
958 | rc = -EINVAL; | |
959 | break; | |
960 | default: | |
961 | rc = -EINVAL; | |
962 | break; | |
963 | } | |
964 | if (rc) | |
965 | break; | |
966 | } | |
967 | if (rc) | |
2c48c4d6 CB |
968 | pr_err("Suspending the system failed because DCSS device %s " |
969 | "is writable\n", | |
c369527f GS |
970 | dev_info->segment_name); |
971 | return rc; | |
972 | } | |
973 | ||
974 | static int dcssblk_restore(struct device *dev) | |
975 | { | |
976 | struct dcssblk_dev_info *dev_info; | |
977 | struct segment_info *entry; | |
978 | unsigned long start, end; | |
979 | int rc = 0; | |
980 | ||
981 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
982 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
983 | segment_unload(entry->segment_name); | |
984 | rc = segment_load(entry->segment_name, SEGMENT_SHARED, | |
985 | &start, &end); | |
986 | if (rc < 0) { | |
987 | // TODO in_use check ? | |
988 | segment_warning(rc, entry->segment_name); | |
989 | goto out_panic; | |
990 | } | |
991 | if (start != entry->start || end != entry->end) { | |
2c48c4d6 CB |
992 | pr_err("The address range of DCSS %s changed " |
993 | "while the system was suspended\n", | |
c369527f GS |
994 | entry->segment_name); |
995 | goto out_panic; | |
996 | } | |
997 | } | |
998 | } | |
999 | return 0; | |
1000 | out_panic: | |
1001 | panic("fatal dcssblk resume error\n"); | |
1002 | } | |
1003 | ||
1004 | static int dcssblk_thaw(struct device *dev) | |
1005 | { | |
1006 | return 0; | |
1007 | } | |
1008 | ||
47145210 | 1009 | static const struct dev_pm_ops dcssblk_pm_ops = { |
c369527f GS |
1010 | .freeze = dcssblk_freeze, |
1011 | .thaw = dcssblk_thaw, | |
1012 | .restore = dcssblk_restore, | |
1013 | }; | |
1014 | ||
1015 | static struct platform_driver dcssblk_pdrv = { | |
1016 | .driver = { | |
1017 | .name = "dcssblk", | |
c369527f GS |
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"); |