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 | 19 | #include <linux/platform_device.h> |
34c0fd54 | 20 | #include <linux/pfn_t.h> |
c369527f GS |
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 | 29 | static int dcssblk_open(struct block_device *bdev, fmode_t mode); |
db2a144b | 30 | static void dcssblk_release(struct gendisk *disk, fmode_t mode); |
dece1635 JA |
31 | static blk_qc_t dcssblk_make_request(struct request_queue *q, |
32 | struct bio *bio); | |
dd22f551 | 33 | static long dcssblk_direct_access(struct block_device *bdev, sector_t secnum, |
34c0fd54 | 34 | void __pmem **kaddr, pfn_t *pfn); |
1da177e4 LT |
35 | |
36 | static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; | |
37 | ||
38 | static int dcssblk_major; | |
83d5cde4 | 39 | static const struct block_device_operations dcssblk_devops = { |
420edbcc | 40 | .owner = THIS_MODULE, |
46d74326 AV |
41 | .open = dcssblk_open, |
42 | .release = dcssblk_release, | |
420edbcc | 43 | .direct_access = dcssblk_direct_access, |
1da177e4 LT |
44 | }; |
45 | ||
b2300b9e HY |
46 | struct dcssblk_dev_info { |
47 | struct list_head lh; | |
48 | struct device dev; | |
98df67b3 | 49 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
50 | atomic_t use_count; |
51 | struct gendisk *gd; | |
52 | unsigned long start; | |
53 | unsigned long end; | |
54 | int segment_type; | |
55 | unsigned char save_pending; | |
56 | unsigned char is_shared; | |
57 | struct request_queue *dcssblk_queue; | |
58 | int num_of_segments; | |
59 | struct list_head seg_list; | |
60 | }; | |
61 | ||
62 | struct segment_info { | |
63 | struct list_head lh; | |
98df67b3 | 64 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
65 | unsigned long start; |
66 | unsigned long end; | |
67 | int segment_type; | |
68 | }; | |
69 | ||
e404e274 | 70 | static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 71 | size_t count); |
e404e274 | 72 | static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 73 | size_t count); |
1da177e4 LT |
74 | |
75 | static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); | |
76 | static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); | |
1da177e4 LT |
77 | |
78 | static struct device *dcssblk_root_dev; | |
79 | ||
c11ca97e | 80 | static LIST_HEAD(dcssblk_devices); |
1da177e4 LT |
81 | static struct rw_semaphore dcssblk_devices_sem; |
82 | ||
83 | /* | |
84 | * release function for segment device. | |
85 | */ | |
86 | static void | |
87 | dcssblk_release_segment(struct device *dev) | |
88 | { | |
b2300b9e HY |
89 | struct dcssblk_dev_info *dev_info; |
90 | struct segment_info *entry, *temp; | |
91 | ||
92 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
93 | list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { | |
94 | list_del(&entry->lh); | |
95 | kfree(entry); | |
96 | } | |
97 | kfree(dev_info); | |
1da177e4 LT |
98 | module_put(THIS_MODULE); |
99 | } | |
100 | ||
101 | /* | |
102 | * get a minor number. needs to be called with | |
103 | * down_write(&dcssblk_devices_sem) and the | |
104 | * device needs to be enqueued before the semaphore is | |
105 | * freed. | |
106 | */ | |
4d284cac | 107 | static int |
1da177e4 LT |
108 | dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) |
109 | { | |
110 | int minor, found; | |
111 | struct dcssblk_dev_info *entry; | |
112 | ||
113 | if (dev_info == NULL) | |
114 | return -EINVAL; | |
115 | for (minor = 0; minor < (1<<MINORBITS); minor++) { | |
116 | found = 0; | |
117 | // test if minor available | |
118 | list_for_each_entry(entry, &dcssblk_devices, lh) | |
d0591485 | 119 | if (minor == entry->gd->first_minor) |
1da177e4 LT |
120 | found++; |
121 | if (!found) break; // got unused minor | |
122 | } | |
123 | if (found) | |
124 | return -EBUSY; | |
125 | dev_info->gd->first_minor = minor; | |
126 | return 0; | |
127 | } | |
128 | ||
129 | /* | |
130 | * get the struct dcssblk_dev_info from dcssblk_devices | |
131 | * for the given name. | |
132 | * down_read(&dcssblk_devices_sem) must be held. | |
133 | */ | |
134 | static struct dcssblk_dev_info * | |
135 | dcssblk_get_device_by_name(char *name) | |
136 | { | |
137 | struct dcssblk_dev_info *entry; | |
138 | ||
139 | list_for_each_entry(entry, &dcssblk_devices, lh) { | |
140 | if (!strcmp(name, entry->segment_name)) { | |
141 | return entry; | |
142 | } | |
143 | } | |
144 | return NULL; | |
145 | } | |
146 | ||
b2300b9e HY |
147 | /* |
148 | * get the struct segment_info from seg_list | |
149 | * for the given name. | |
150 | * down_read(&dcssblk_devices_sem) must be held. | |
151 | */ | |
152 | static struct segment_info * | |
153 | dcssblk_get_segment_by_name(char *name) | |
154 | { | |
155 | struct dcssblk_dev_info *dev_info; | |
156 | struct segment_info *entry; | |
157 | ||
158 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
159 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
160 | if (!strcmp(name, entry->segment_name)) | |
161 | return entry; | |
162 | } | |
163 | } | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | /* | |
168 | * get the highest address of the multi-segment block. | |
169 | */ | |
170 | static unsigned long | |
171 | dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) | |
172 | { | |
173 | unsigned long highest_addr; | |
174 | struct segment_info *entry; | |
175 | ||
176 | highest_addr = 0; | |
177 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
178 | if (highest_addr < entry->end) | |
179 | highest_addr = entry->end; | |
180 | } | |
181 | return highest_addr; | |
182 | } | |
183 | ||
184 | /* | |
185 | * get the lowest address of the multi-segment block. | |
186 | */ | |
187 | static unsigned long | |
188 | dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) | |
189 | { | |
190 | int set_first; | |
191 | unsigned long lowest_addr; | |
192 | struct segment_info *entry; | |
193 | ||
194 | set_first = 0; | |
195 | lowest_addr = 0; | |
196 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
197 | if (set_first == 0) { | |
198 | lowest_addr = entry->start; | |
199 | set_first = 1; | |
200 | } else { | |
201 | if (lowest_addr > entry->start) | |
202 | lowest_addr = entry->start; | |
203 | } | |
204 | } | |
205 | return lowest_addr; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Check continuity of segments. | |
210 | */ | |
211 | static int | |
212 | dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) | |
213 | { | |
214 | int i, j, rc; | |
215 | struct segment_info *sort_list, *entry, temp; | |
216 | ||
217 | if (dev_info->num_of_segments <= 1) | |
218 | return 0; | |
219 | ||
220 | sort_list = kzalloc( | |
221 | sizeof(struct segment_info) * dev_info->num_of_segments, | |
222 | GFP_KERNEL); | |
223 | if (sort_list == NULL) | |
224 | return -ENOMEM; | |
225 | i = 0; | |
226 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
227 | memcpy(&sort_list[i], entry, sizeof(struct segment_info)); | |
228 | i++; | |
229 | } | |
230 | ||
231 | /* sort segments */ | |
232 | for (i = 0; i < dev_info->num_of_segments; i++) | |
233 | for (j = 0; j < dev_info->num_of_segments; j++) | |
234 | if (sort_list[j].start > sort_list[i].start) { | |
235 | memcpy(&temp, &sort_list[i], | |
236 | sizeof(struct segment_info)); | |
237 | memcpy(&sort_list[i], &sort_list[j], | |
238 | sizeof(struct segment_info)); | |
239 | memcpy(&sort_list[j], &temp, | |
240 | sizeof(struct segment_info)); | |
241 | } | |
242 | ||
243 | /* check continuity */ | |
244 | for (i = 0; i < dev_info->num_of_segments - 1; i++) { | |
245 | if ((sort_list[i].end + 1) != sort_list[i+1].start) { | |
93098bf0 HY |
246 | pr_err("Adjacent DCSSs %s and %s are not " |
247 | "contiguous\n", sort_list[i].segment_name, | |
248 | sort_list[i+1].segment_name); | |
b2300b9e HY |
249 | rc = -EINVAL; |
250 | goto out; | |
251 | } | |
252 | /* EN and EW are allowed in a block device */ | |
253 | if (sort_list[i].segment_type != sort_list[i+1].segment_type) { | |
254 | if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || | |
255 | (sort_list[i].segment_type == SEG_TYPE_ER) || | |
256 | !(sort_list[i+1].segment_type & | |
257 | SEGMENT_EXCLUSIVE) || | |
258 | (sort_list[i+1].segment_type == SEG_TYPE_ER)) { | |
93098bf0 HY |
259 | pr_err("DCSS %s and DCSS %s have " |
260 | "incompatible types\n", | |
261 | sort_list[i].segment_name, | |
262 | sort_list[i+1].segment_name); | |
b2300b9e HY |
263 | rc = -EINVAL; |
264 | goto out; | |
265 | } | |
266 | } | |
267 | } | |
268 | rc = 0; | |
269 | out: | |
270 | kfree(sort_list); | |
271 | return rc; | |
272 | } | |
273 | ||
274 | /* | |
275 | * Load a segment | |
276 | */ | |
277 | static int | |
278 | dcssblk_load_segment(char *name, struct segment_info **seg_info) | |
279 | { | |
280 | int rc; | |
281 | ||
282 | /* already loaded? */ | |
283 | down_read(&dcssblk_devices_sem); | |
284 | *seg_info = dcssblk_get_segment_by_name(name); | |
285 | up_read(&dcssblk_devices_sem); | |
286 | if (*seg_info != NULL) | |
287 | return -EEXIST; | |
288 | ||
289 | /* get a struct segment_info */ | |
290 | *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); | |
291 | if (*seg_info == NULL) | |
292 | return -ENOMEM; | |
293 | ||
294 | strcpy((*seg_info)->segment_name, name); | |
295 | ||
296 | /* load the segment */ | |
297 | rc = segment_load(name, SEGMENT_SHARED, | |
298 | &(*seg_info)->start, &(*seg_info)->end); | |
299 | if (rc < 0) { | |
300 | segment_warning(rc, (*seg_info)->segment_name); | |
301 | kfree(*seg_info); | |
302 | } else { | |
303 | INIT_LIST_HEAD(&(*seg_info)->lh); | |
304 | (*seg_info)->segment_type = rc; | |
305 | } | |
306 | return rc; | |
307 | } | |
308 | ||
1da177e4 LT |
309 | /* |
310 | * device attribute for switching shared/nonshared (exclusive) | |
311 | * operation (show + store) | |
312 | */ | |
313 | static ssize_t | |
e404e274 | 314 | dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
315 | { |
316 | struct dcssblk_dev_info *dev_info; | |
317 | ||
318 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
319 | return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); | |
320 | } | |
321 | ||
322 | static ssize_t | |
e404e274 | 323 | dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
324 | { |
325 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 326 | struct segment_info *entry, *temp; |
1da177e4 LT |
327 | int rc; |
328 | ||
ded77fb4 | 329 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 330 | return -EINVAL; |
1da177e4 LT |
331 | down_write(&dcssblk_devices_sem); |
332 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
333 | if (atomic_read(&dev_info->use_count)) { | |
1da177e4 LT |
334 | rc = -EBUSY; |
335 | goto out; | |
336 | } | |
337 | if (inbuf[0] == '1') { | |
b2300b9e HY |
338 | /* reload segments in shared mode */ |
339 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
340 | rc = segment_modify_shared(entry->segment_name, | |
341 | SEGMENT_SHARED); | |
342 | if (rc < 0) { | |
343 | BUG_ON(rc == -EINVAL); | |
344 | if (rc != -EAGAIN) | |
345 | goto removeseg; | |
1da177e4 LT |
346 | } |
347 | } | |
b2300b9e HY |
348 | dev_info->is_shared = 1; |
349 | switch (dev_info->segment_type) { | |
350 | case SEG_TYPE_SR: | |
351 | case SEG_TYPE_ER: | |
352 | case SEG_TYPE_SC: | |
353 | set_disk_ro(dev_info->gd, 1); | |
354 | } | |
1da177e4 | 355 | } else if (inbuf[0] == '0') { |
b2300b9e | 356 | /* reload segments in exclusive mode */ |
1da177e4 | 357 | if (dev_info->segment_type == SEG_TYPE_SC) { |
93098bf0 HY |
358 | pr_err("DCSS %s is of type SC and cannot be " |
359 | "loaded as exclusive-writable\n", | |
360 | dev_info->segment_name); | |
1da177e4 LT |
361 | rc = -EINVAL; |
362 | goto out; | |
363 | } | |
b2300b9e HY |
364 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
365 | rc = segment_modify_shared(entry->segment_name, | |
366 | SEGMENT_EXCLUSIVE); | |
367 | if (rc < 0) { | |
368 | BUG_ON(rc == -EINVAL); | |
369 | if (rc != -EAGAIN) | |
370 | goto removeseg; | |
371 | } | |
1da177e4 | 372 | } |
b2300b9e HY |
373 | dev_info->is_shared = 0; |
374 | set_disk_ro(dev_info->gd, 0); | |
1da177e4 | 375 | } else { |
1da177e4 LT |
376 | rc = -EINVAL; |
377 | goto out; | |
378 | } | |
379 | rc = count; | |
380 | goto out; | |
381 | ||
382 | removeseg: | |
93098bf0 HY |
383 | pr_err("DCSS device %s is removed after a failed access mode " |
384 | "change\n", dev_info->segment_name); | |
b2300b9e HY |
385 | temp = entry; |
386 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
387 | if (entry != temp) | |
388 | segment_unload(entry->segment_name); | |
389 | } | |
1da177e4 LT |
390 | list_del(&dev_info->lh); |
391 | ||
392 | del_gendisk(dev_info->gd); | |
1312f40e | 393 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
394 | dev_info->gd->queue = NULL; |
395 | put_disk(dev_info->gd); | |
0b60f9ea TH |
396 | up_write(&dcssblk_devices_sem); |
397 | ||
398 | if (device_remove_file_self(dev, attr)) { | |
399 | device_unregister(dev); | |
400 | put_device(dev); | |
401 | } | |
402 | return rc; | |
1da177e4 LT |
403 | out: |
404 | up_write(&dcssblk_devices_sem); | |
405 | return rc; | |
406 | } | |
521b3d79 SO |
407 | static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, |
408 | dcssblk_shared_store); | |
1da177e4 LT |
409 | |
410 | /* | |
411 | * device attribute for save operation on current copy | |
412 | * of the segment. If the segment is busy, saving will | |
413 | * become pending until it gets released, which can be | |
414 | * undone by storing a non-true value to this entry. | |
415 | * (show + store) | |
416 | */ | |
417 | static ssize_t | |
e404e274 | 418 | dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
419 | { |
420 | struct dcssblk_dev_info *dev_info; | |
421 | ||
422 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
423 | return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); | |
424 | } | |
425 | ||
426 | static ssize_t | |
e404e274 | 427 | dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
428 | { |
429 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 430 | struct segment_info *entry; |
1da177e4 | 431 | |
ded77fb4 | 432 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 433 | return -EINVAL; |
1da177e4 LT |
434 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
435 | ||
436 | down_write(&dcssblk_devices_sem); | |
437 | if (inbuf[0] == '1') { | |
438 | if (atomic_read(&dev_info->use_count) == 0) { | |
439 | // device is idle => we save immediately | |
93098bf0 HY |
440 | pr_info("All DCSSs that map to device %s are " |
441 | "saved\n", dev_info->segment_name); | |
b2300b9e | 442 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
443 | if (entry->segment_type == SEG_TYPE_EN || |
444 | entry->segment_type == SEG_TYPE_SN) | |
445 | pr_warn("DCSS %s is of type SN or EN" | |
446 | " and cannot be saved\n", | |
447 | entry->segment_name); | |
448 | else | |
449 | segment_save(entry->segment_name); | |
b2300b9e | 450 | } |
1da177e4 LT |
451 | } else { |
452 | // device is busy => we save it when it becomes | |
453 | // idle in dcssblk_release | |
93098bf0 HY |
454 | pr_info("Device %s is in use, its DCSSs will be " |
455 | "saved when it becomes idle\n", | |
456 | dev_info->segment_name); | |
1da177e4 LT |
457 | dev_info->save_pending = 1; |
458 | } | |
459 | } else if (inbuf[0] == '0') { | |
460 | if (dev_info->save_pending) { | |
461 | // device is busy & the user wants to undo his save | |
462 | // request | |
463 | dev_info->save_pending = 0; | |
93098bf0 HY |
464 | pr_info("A pending save request for device %s " |
465 | "has been canceled\n", | |
466 | dev_info->segment_name); | |
1da177e4 LT |
467 | } |
468 | } else { | |
469 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
470 | return -EINVAL; |
471 | } | |
472 | up_write(&dcssblk_devices_sem); | |
473 | return count; | |
474 | } | |
521b3d79 SO |
475 | static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, |
476 | dcssblk_save_store); | |
1da177e4 | 477 | |
b2300b9e HY |
478 | /* |
479 | * device attribute for showing all segments in a device | |
480 | */ | |
481 | static ssize_t | |
482 | dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, | |
483 | char *buf) | |
484 | { | |
485 | int i; | |
486 | ||
487 | struct dcssblk_dev_info *dev_info; | |
488 | struct segment_info *entry; | |
489 | ||
490 | down_read(&dcssblk_devices_sem); | |
491 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
492 | i = 0; | |
493 | buf[0] = '\0'; | |
494 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
495 | strcpy(&buf[i], entry->segment_name); | |
496 | i += strlen(entry->segment_name); | |
497 | buf[i] = '\n'; | |
498 | i++; | |
499 | } | |
500 | up_read(&dcssblk_devices_sem); | |
501 | return i; | |
502 | } | |
521b3d79 SO |
503 | static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); |
504 | ||
505 | static struct attribute *dcssblk_dev_attrs[] = { | |
506 | &dev_attr_shared.attr, | |
507 | &dev_attr_save.attr, | |
508 | &dev_attr_seglist.attr, | |
509 | NULL, | |
510 | }; | |
511 | static struct attribute_group dcssblk_dev_attr_group = { | |
512 | .attrs = dcssblk_dev_attrs, | |
513 | }; | |
514 | static const struct attribute_group *dcssblk_dev_attr_groups[] = { | |
515 | &dcssblk_dev_attr_group, | |
516 | NULL, | |
517 | }; | |
b2300b9e | 518 | |
1da177e4 LT |
519 | /* |
520 | * device attribute for adding devices | |
521 | */ | |
522 | static ssize_t | |
e404e274 | 523 | dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 524 | { |
b2300b9e | 525 | int rc, i, j, num_of_segments; |
1da177e4 | 526 | struct dcssblk_dev_info *dev_info; |
b2300b9e | 527 | struct segment_info *seg_info, *temp; |
1da177e4 LT |
528 | char *local_buf; |
529 | unsigned long seg_byte_size; | |
530 | ||
531 | dev_info = NULL; | |
b2300b9e | 532 | seg_info = NULL; |
1da177e4 LT |
533 | if (dev != dcssblk_root_dev) { |
534 | rc = -EINVAL; | |
535 | goto out_nobuf; | |
536 | } | |
b2300b9e HY |
537 | if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { |
538 | rc = -ENAMETOOLONG; | |
539 | goto out_nobuf; | |
540 | } | |
541 | ||
1da177e4 LT |
542 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
543 | if (local_buf == NULL) { | |
544 | rc = -ENOMEM; | |
545 | goto out_nobuf; | |
546 | } | |
b2300b9e | 547 | |
1da177e4 LT |
548 | /* |
549 | * parse input | |
550 | */ | |
b2300b9e | 551 | num_of_segments = 0; |
3a9f9183 | 552 | for (i = 0; (i < count && (buf[i] != '\0') && (buf[i] != '\n')); i++) { |
42cfc6b5 MS |
553 | for (j = i; j < count && |
554 | (buf[j] != ':') && | |
b2300b9e | 555 | (buf[j] != '\0') && |
42cfc6b5 | 556 | (buf[j] != '\n'); j++) { |
b2300b9e HY |
557 | local_buf[j-i] = toupper(buf[j]); |
558 | } | |
559 | local_buf[j-i] = '\0'; | |
560 | if (((j - i) == 0) || ((j - i) > 8)) { | |
561 | rc = -ENAMETOOLONG; | |
562 | goto seg_list_del; | |
563 | } | |
564 | ||
565 | rc = dcssblk_load_segment(local_buf, &seg_info); | |
566 | if (rc < 0) | |
567 | goto seg_list_del; | |
568 | /* | |
569 | * get a struct dcssblk_dev_info | |
570 | */ | |
571 | if (num_of_segments == 0) { | |
572 | dev_info = kzalloc(sizeof(struct dcssblk_dev_info), | |
573 | GFP_KERNEL); | |
574 | if (dev_info == NULL) { | |
575 | rc = -ENOMEM; | |
576 | goto out; | |
577 | } | |
578 | strcpy(dev_info->segment_name, local_buf); | |
579 | dev_info->segment_type = seg_info->segment_type; | |
580 | INIT_LIST_HEAD(&dev_info->seg_list); | |
581 | } | |
582 | list_add_tail(&seg_info->lh, &dev_info->seg_list); | |
583 | num_of_segments++; | |
584 | i = j; | |
585 | ||
586 | if ((buf[j] == '\0') || (buf[j] == '\n')) | |
587 | break; | |
1da177e4 | 588 | } |
b2300b9e HY |
589 | |
590 | /* no trailing colon at the end of the input */ | |
591 | if ((i > 0) && (buf[i-1] == ':')) { | |
1da177e4 | 592 | rc = -ENAMETOOLONG; |
b2300b9e | 593 | goto seg_list_del; |
1da177e4 | 594 | } |
b2300b9e HY |
595 | strlcpy(local_buf, buf, i + 1); |
596 | dev_info->num_of_segments = num_of_segments; | |
597 | rc = dcssblk_is_continuous(dev_info); | |
598 | if (rc < 0) | |
599 | goto seg_list_del; | |
600 | ||
601 | dev_info->start = dcssblk_find_lowest_addr(dev_info); | |
602 | dev_info->end = dcssblk_find_highest_addr(dev_info); | |
1da177e4 | 603 | |
ef283688 | 604 | dev_set_name(&dev_info->dev, "%s", dev_info->segment_name); |
1da177e4 | 605 | dev_info->dev.release = dcssblk_release_segment; |
521b3d79 | 606 | dev_info->dev.groups = dcssblk_dev_attr_groups; |
1da177e4 | 607 | INIT_LIST_HEAD(&dev_info->lh); |
1da177e4 LT |
608 | dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); |
609 | if (dev_info->gd == NULL) { | |
610 | rc = -ENOMEM; | |
b2300b9e | 611 | goto seg_list_del; |
1da177e4 LT |
612 | } |
613 | dev_info->gd->major = dcssblk_major; | |
614 | dev_info->gd->fops = &dcssblk_devops; | |
615 | dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); | |
616 | dev_info->gd->queue = dev_info->dcssblk_queue; | |
617 | dev_info->gd->private_data = dev_info; | |
618 | dev_info->gd->driverfs_dev = &dev_info->dev; | |
c5411dba | 619 | blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); |
e1defc4f | 620 | blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); |
b2300b9e | 621 | |
1da177e4 LT |
622 | seg_byte_size = (dev_info->end - dev_info->start + 1); |
623 | set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors | |
93098bf0 HY |
624 | pr_info("Loaded %s with total size %lu bytes and capacity %lu " |
625 | "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); | |
1da177e4 | 626 | |
1da177e4 LT |
627 | dev_info->save_pending = 0; |
628 | dev_info->is_shared = 1; | |
629 | dev_info->dev.parent = dcssblk_root_dev; | |
630 | ||
631 | /* | |
b2300b9e | 632 | *get minor, add to list |
1da177e4 LT |
633 | */ |
634 | down_write(&dcssblk_devices_sem); | |
b2300b9e | 635 | if (dcssblk_get_segment_by_name(local_buf)) { |
04f64b57 | 636 | rc = -EEXIST; |
b2300b9e | 637 | goto release_gd; |
04f64b57 | 638 | } |
1da177e4 | 639 | rc = dcssblk_assign_free_minor(dev_info); |
b2300b9e HY |
640 | if (rc) |
641 | goto release_gd; | |
1da177e4 | 642 | sprintf(dev_info->gd->disk_name, "dcssblk%d", |
d0591485 | 643 | dev_info->gd->first_minor); |
1da177e4 LT |
644 | list_add_tail(&dev_info->lh, &dcssblk_devices); |
645 | ||
646 | if (!try_module_get(THIS_MODULE)) { | |
647 | rc = -ENODEV; | |
b2300b9e | 648 | goto dev_list_del; |
1da177e4 LT |
649 | } |
650 | /* | |
651 | * register the device | |
652 | */ | |
653 | rc = device_register(&dev_info->dev); | |
b2300b9e | 654 | if (rc) |
521b3d79 | 655 | goto put_dev; |
1da177e4 | 656 | |
521b3d79 | 657 | get_device(&dev_info->dev); |
436d1bc7 CB |
658 | add_disk(dev_info->gd); |
659 | ||
1da177e4 LT |
660 | switch (dev_info->segment_type) { |
661 | case SEG_TYPE_SR: | |
662 | case SEG_TYPE_ER: | |
663 | case SEG_TYPE_SC: | |
664 | set_disk_ro(dev_info->gd,1); | |
665 | break; | |
666 | default: | |
667 | set_disk_ro(dev_info->gd,0); | |
668 | break; | |
669 | } | |
1da177e4 LT |
670 | up_write(&dcssblk_devices_sem); |
671 | rc = count; | |
672 | goto out; | |
673 | ||
521b3d79 | 674 | put_dev: |
1da177e4 | 675 | list_del(&dev_info->lh); |
1312f40e | 676 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
677 | dev_info->gd->queue = NULL; |
678 | put_disk(dev_info->gd); | |
b2300b9e HY |
679 | list_for_each_entry(seg_info, &dev_info->seg_list, lh) { |
680 | segment_unload(seg_info->segment_name); | |
681 | } | |
1da177e4 LT |
682 | put_device(&dev_info->dev); |
683 | up_write(&dcssblk_devices_sem); | |
684 | goto out; | |
b2300b9e | 685 | dev_list_del: |
1da177e4 | 686 | list_del(&dev_info->lh); |
b2300b9e | 687 | release_gd: |
1312f40e | 688 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
689 | dev_info->gd->queue = NULL; |
690 | put_disk(dev_info->gd); | |
b2300b9e HY |
691 | up_write(&dcssblk_devices_sem); |
692 | seg_list_del: | |
693 | if (dev_info == NULL) | |
694 | goto out; | |
695 | list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) { | |
696 | list_del(&seg_info->lh); | |
697 | segment_unload(seg_info->segment_name); | |
698 | kfree(seg_info); | |
699 | } | |
1da177e4 LT |
700 | kfree(dev_info); |
701 | out: | |
702 | kfree(local_buf); | |
703 | out_nobuf: | |
704 | return rc; | |
705 | } | |
706 | ||
707 | /* | |
708 | * device attribute for removing devices | |
709 | */ | |
710 | static ssize_t | |
e404e274 | 711 | dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
712 | { |
713 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 714 | struct segment_info *entry; |
1da177e4 LT |
715 | int rc, i; |
716 | char *local_buf; | |
717 | ||
718 | if (dev != dcssblk_root_dev) { | |
719 | return -EINVAL; | |
720 | } | |
721 | local_buf = kmalloc(count + 1, GFP_KERNEL); | |
722 | if (local_buf == NULL) { | |
723 | return -ENOMEM; | |
724 | } | |
725 | /* | |
726 | * parse input | |
727 | */ | |
42cfc6b5 | 728 | for (i = 0; (i < count && (*(buf+i)!='\0') && (*(buf+i)!='\n')); i++) { |
1da177e4 LT |
729 | local_buf[i] = toupper(buf[i]); |
730 | } | |
731 | local_buf[i] = '\0'; | |
732 | if ((i == 0) || (i > 8)) { | |
733 | rc = -ENAMETOOLONG; | |
734 | goto out_buf; | |
735 | } | |
736 | ||
737 | down_write(&dcssblk_devices_sem); | |
738 | dev_info = dcssblk_get_device_by_name(local_buf); | |
739 | if (dev_info == NULL) { | |
740 | up_write(&dcssblk_devices_sem); | |
baebc70a JP |
741 | pr_warn("Device %s cannot be removed because it is not a known device\n", |
742 | local_buf); | |
1da177e4 LT |
743 | rc = -ENODEV; |
744 | goto out_buf; | |
745 | } | |
746 | if (atomic_read(&dev_info->use_count) != 0) { | |
747 | up_write(&dcssblk_devices_sem); | |
baebc70a JP |
748 | pr_warn("Device %s cannot be removed while it is in use\n", |
749 | local_buf); | |
1da177e4 LT |
750 | rc = -EBUSY; |
751 | goto out_buf; | |
752 | } | |
1da177e4 | 753 | |
b2300b9e | 754 | list_del(&dev_info->lh); |
1da177e4 | 755 | del_gendisk(dev_info->gd); |
1312f40e | 756 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
757 | dev_info->gd->queue = NULL; |
758 | put_disk(dev_info->gd); | |
759 | device_unregister(&dev_info->dev); | |
b2300b9e HY |
760 | |
761 | /* unload all related segments */ | |
762 | list_for_each_entry(entry, &dev_info->seg_list, lh) | |
763 | segment_unload(entry->segment_name); | |
764 | ||
1da177e4 LT |
765 | put_device(&dev_info->dev); |
766 | up_write(&dcssblk_devices_sem); | |
767 | ||
768 | rc = count; | |
769 | out_buf: | |
770 | kfree(local_buf); | |
771 | return rc; | |
772 | } | |
773 | ||
774 | static int | |
46d74326 | 775 | dcssblk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
776 | { |
777 | struct dcssblk_dev_info *dev_info; | |
778 | int rc; | |
779 | ||
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: | |
789 | return rc; | |
790 | } | |
791 | ||
db2a144b | 792 | static void |
46d74326 | 793 | dcssblk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 794 | { |
46d74326 | 795 | struct dcssblk_dev_info *dev_info = disk->private_data; |
b2300b9e | 796 | struct segment_info *entry; |
1da177e4 | 797 | |
46d74326 | 798 | if (!dev_info) { |
db2a144b AV |
799 | WARN_ON(1); |
800 | return; | |
1da177e4 LT |
801 | } |
802 | down_write(&dcssblk_devices_sem); | |
803 | if (atomic_dec_and_test(&dev_info->use_count) | |
804 | && (dev_info->save_pending)) { | |
93098bf0 HY |
805 | pr_info("Device %s has become idle and is being saved " |
806 | "now\n", dev_info->segment_name); | |
b2300b9e | 807 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
808 | if (entry->segment_type == SEG_TYPE_EN || |
809 | entry->segment_type == SEG_TYPE_SN) | |
810 | pr_warn("DCSS %s is of type SN or EN and cannot" | |
811 | " be saved\n", entry->segment_name); | |
812 | else | |
813 | segment_save(entry->segment_name); | |
b2300b9e | 814 | } |
1da177e4 LT |
815 | dev_info->save_pending = 0; |
816 | } | |
817 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
818 | } |
819 | ||
dece1635 | 820 | static blk_qc_t |
165125e1 | 821 | dcssblk_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
822 | { |
823 | struct dcssblk_dev_info *dev_info; | |
7988613b KO |
824 | struct bio_vec bvec; |
825 | struct bvec_iter iter; | |
1da177e4 LT |
826 | unsigned long index; |
827 | unsigned long page_addr; | |
828 | unsigned long source_addr; | |
829 | unsigned long bytes_done; | |
1da177e4 | 830 | |
54efd50b KO |
831 | blk_queue_split(q, &bio, q->bio_split); |
832 | ||
1da177e4 LT |
833 | bytes_done = 0; |
834 | dev_info = bio->bi_bdev->bd_disk->private_data; | |
835 | if (dev_info == NULL) | |
836 | goto fail; | |
4f024f37 KO |
837 | if ((bio->bi_iter.bi_sector & 7) != 0 || |
838 | (bio->bi_iter.bi_size & 4095) != 0) | |
1da177e4 LT |
839 | /* Request is not page-aligned. */ |
840 | goto fail; | |
f73a1c7d | 841 | if (bio_end_sector(bio) > get_capacity(bio->bi_bdev->bd_disk)) { |
1da177e4 LT |
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) { | |
baebc70a JP |
853 | pr_warn("Writing to %s failed because it is a read-only device\n", |
854 | dev_name(&dev_info->dev)); | |
420edbcc CO |
855 | goto fail; |
856 | } | |
857 | } | |
858 | } | |
859 | ||
4f024f37 | 860 | index = (bio->bi_iter.bi_sector >> 3); |
7988613b | 861 | bio_for_each_segment(bvec, bio, iter) { |
1da177e4 | 862 | page_addr = (unsigned long) |
7988613b | 863 | page_address(bvec.bv_page) + bvec.bv_offset; |
1da177e4 | 864 | source_addr = dev_info->start + (index<<12) + bytes_done; |
7988613b | 865 | if (unlikely((page_addr & 4095) != 0) || (bvec.bv_len & 4095) != 0) |
1da177e4 LT |
866 | // More paranoia. |
867 | goto fail; | |
868 | if (bio_data_dir(bio) == READ) { | |
869 | memcpy((void*)page_addr, (void*)source_addr, | |
7988613b | 870 | bvec.bv_len); |
1da177e4 LT |
871 | } else { |
872 | memcpy((void*)source_addr, (void*)page_addr, | |
7988613b | 873 | bvec.bv_len); |
1da177e4 | 874 | } |
7988613b | 875 | bytes_done += bvec.bv_len; |
1da177e4 | 876 | } |
4246a0b6 | 877 | bio_endio(bio); |
dece1635 | 878 | return BLK_QC_T_NONE; |
1da177e4 | 879 | fail: |
6712ecf8 | 880 | bio_io_error(bio); |
dece1635 | 881 | return BLK_QC_T_NONE; |
420edbcc CO |
882 | } |
883 | ||
dd22f551 | 884 | static long |
420edbcc | 885 | dcssblk_direct_access (struct block_device *bdev, sector_t secnum, |
34c0fd54 | 886 | void __pmem **kaddr, pfn_t *pfn) |
420edbcc CO |
887 | { |
888 | struct dcssblk_dev_info *dev_info; | |
dd22f551 | 889 | unsigned long offset, dev_sz; |
420edbcc CO |
890 | |
891 | dev_info = bdev->bd_disk->private_data; | |
892 | if (!dev_info) | |
893 | return -ENODEV; | |
dd22f551 MW |
894 | dev_sz = dev_info->end - dev_info->start; |
895 | offset = secnum * 512; | |
34c0fd54 DW |
896 | *kaddr = (void __pmem *) (dev_info->start + offset); |
897 | *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), PFN_DEV); | |
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"); |