Commit | Line | Data |
---|---|---|
6a55d2cd | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * dcssblk.c -- the S/390 block driver for dcss memory | |
4 | * | |
5 | * Authors: Carsten Otte, Stefan Weinhuber, Gerald Schaefer | |
6 | */ | |
7 | ||
93098bf0 HY |
8 | #define KMSG_COMPONENT "dcssblk" |
9 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
10 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/moduleparam.h> | |
13 | #include <linux/ctype.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/blkdev.h> | |
1da177e4 LT |
18 | #include <linux/completion.h> |
19 | #include <linux/interrupt.h> | |
c369527f | 20 | #include <linux/platform_device.h> |
34c0fd54 | 21 | #include <linux/pfn_t.h> |
5d61e43b | 22 | #include <linux/uio.h> |
7a2765f6 | 23 | #include <linux/dax.h> |
c369527f GS |
24 | #include <asm/extmem.h> |
25 | #include <asm/io.h> | |
1da177e4 | 26 | |
1da177e4 LT |
27 | #define DCSSBLK_NAME "dcssblk" |
28 | #define DCSSBLK_MINORS_PER_DISK 1 | |
29 | #define DCSSBLK_PARM_LEN 400 | |
98df67b3 | 30 | #define DCSS_BUS_ID_SIZE 20 |
1da177e4 | 31 | |
46d74326 | 32 | static int dcssblk_open(struct block_device *bdev, fmode_t mode); |
db2a144b | 33 | static void dcssblk_release(struct gendisk *disk, fmode_t mode); |
dece1635 JA |
34 | static blk_qc_t dcssblk_make_request(struct request_queue *q, |
35 | struct bio *bio); | |
7a2765f6 DW |
36 | static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, |
37 | long nr_pages, void **kaddr, pfn_t *pfn); | |
1da177e4 LT |
38 | |
39 | static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; | |
40 | ||
41 | static int dcssblk_major; | |
83d5cde4 | 42 | static const struct block_device_operations dcssblk_devops = { |
420edbcc | 43 | .owner = THIS_MODULE, |
46d74326 AV |
44 | .open = dcssblk_open, |
45 | .release = dcssblk_release, | |
7a2765f6 DW |
46 | }; |
47 | ||
5d61e43b DW |
48 | static size_t dcssblk_dax_copy_from_iter(struct dax_device *dax_dev, |
49 | pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) | |
50 | { | |
51 | return copy_from_iter(addr, bytes, i); | |
52 | } | |
53 | ||
7a2765f6 DW |
54 | static const struct dax_operations dcssblk_dax_ops = { |
55 | .direct_access = dcssblk_dax_direct_access, | |
5d61e43b | 56 | .copy_from_iter = dcssblk_dax_copy_from_iter, |
1da177e4 LT |
57 | }; |
58 | ||
b2300b9e HY |
59 | struct dcssblk_dev_info { |
60 | struct list_head lh; | |
61 | struct device dev; | |
98df67b3 | 62 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
63 | atomic_t use_count; |
64 | struct gendisk *gd; | |
65 | unsigned long start; | |
66 | unsigned long end; | |
67 | int segment_type; | |
68 | unsigned char save_pending; | |
69 | unsigned char is_shared; | |
70 | struct request_queue *dcssblk_queue; | |
71 | int num_of_segments; | |
72 | struct list_head seg_list; | |
7a2765f6 | 73 | struct dax_device *dax_dev; |
b2300b9e HY |
74 | }; |
75 | ||
76 | struct segment_info { | |
77 | struct list_head lh; | |
98df67b3 | 78 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
79 | unsigned long start; |
80 | unsigned long end; | |
81 | int segment_type; | |
82 | }; | |
83 | ||
e404e274 | 84 | static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 85 | size_t count); |
e404e274 | 86 | static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 87 | size_t count); |
1da177e4 LT |
88 | |
89 | static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); | |
90 | static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); | |
1da177e4 LT |
91 | |
92 | static struct device *dcssblk_root_dev; | |
93 | ||
c11ca97e | 94 | static LIST_HEAD(dcssblk_devices); |
1da177e4 LT |
95 | static struct rw_semaphore dcssblk_devices_sem; |
96 | ||
97 | /* | |
98 | * release function for segment device. | |
99 | */ | |
100 | static void | |
101 | dcssblk_release_segment(struct device *dev) | |
102 | { | |
b2300b9e HY |
103 | struct dcssblk_dev_info *dev_info; |
104 | struct segment_info *entry, *temp; | |
105 | ||
106 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
107 | list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { | |
108 | list_del(&entry->lh); | |
109 | kfree(entry); | |
110 | } | |
111 | kfree(dev_info); | |
1da177e4 LT |
112 | module_put(THIS_MODULE); |
113 | } | |
114 | ||
115 | /* | |
116 | * get a minor number. needs to be called with | |
117 | * down_write(&dcssblk_devices_sem) and the | |
118 | * device needs to be enqueued before the semaphore is | |
119 | * freed. | |
120 | */ | |
4d284cac | 121 | static int |
1da177e4 LT |
122 | dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) |
123 | { | |
124 | int minor, found; | |
125 | struct dcssblk_dev_info *entry; | |
126 | ||
127 | if (dev_info == NULL) | |
128 | return -EINVAL; | |
129 | for (minor = 0; minor < (1<<MINORBITS); minor++) { | |
130 | found = 0; | |
131 | // test if minor available | |
132 | list_for_each_entry(entry, &dcssblk_devices, lh) | |
d0591485 | 133 | if (minor == entry->gd->first_minor) |
1da177e4 LT |
134 | found++; |
135 | if (!found) break; // got unused minor | |
136 | } | |
137 | if (found) | |
138 | return -EBUSY; | |
139 | dev_info->gd->first_minor = minor; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | /* | |
144 | * get the struct dcssblk_dev_info from dcssblk_devices | |
145 | * for the given name. | |
146 | * down_read(&dcssblk_devices_sem) must be held. | |
147 | */ | |
148 | static struct dcssblk_dev_info * | |
149 | dcssblk_get_device_by_name(char *name) | |
150 | { | |
151 | struct dcssblk_dev_info *entry; | |
152 | ||
153 | list_for_each_entry(entry, &dcssblk_devices, lh) { | |
154 | if (!strcmp(name, entry->segment_name)) { | |
155 | return entry; | |
156 | } | |
157 | } | |
158 | return NULL; | |
159 | } | |
160 | ||
b2300b9e HY |
161 | /* |
162 | * get the struct segment_info from seg_list | |
163 | * for the given name. | |
164 | * down_read(&dcssblk_devices_sem) must be held. | |
165 | */ | |
166 | static struct segment_info * | |
167 | dcssblk_get_segment_by_name(char *name) | |
168 | { | |
169 | struct dcssblk_dev_info *dev_info; | |
170 | struct segment_info *entry; | |
171 | ||
172 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
173 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
174 | if (!strcmp(name, entry->segment_name)) | |
175 | return entry; | |
176 | } | |
177 | } | |
178 | return NULL; | |
179 | } | |
180 | ||
181 | /* | |
182 | * get the highest address of the multi-segment block. | |
183 | */ | |
184 | static unsigned long | |
185 | dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) | |
186 | { | |
187 | unsigned long highest_addr; | |
188 | struct segment_info *entry; | |
189 | ||
190 | highest_addr = 0; | |
191 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
192 | if (highest_addr < entry->end) | |
193 | highest_addr = entry->end; | |
194 | } | |
195 | return highest_addr; | |
196 | } | |
197 | ||
198 | /* | |
199 | * get the lowest address of the multi-segment block. | |
200 | */ | |
201 | static unsigned long | |
202 | dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) | |
203 | { | |
204 | int set_first; | |
205 | unsigned long lowest_addr; | |
206 | struct segment_info *entry; | |
207 | ||
208 | set_first = 0; | |
209 | lowest_addr = 0; | |
210 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
211 | if (set_first == 0) { | |
212 | lowest_addr = entry->start; | |
213 | set_first = 1; | |
214 | } else { | |
215 | if (lowest_addr > entry->start) | |
216 | lowest_addr = entry->start; | |
217 | } | |
218 | } | |
219 | return lowest_addr; | |
220 | } | |
221 | ||
222 | /* | |
223 | * Check continuity of segments. | |
224 | */ | |
225 | static int | |
226 | dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) | |
227 | { | |
228 | int i, j, rc; | |
229 | struct segment_info *sort_list, *entry, temp; | |
230 | ||
231 | if (dev_info->num_of_segments <= 1) | |
232 | return 0; | |
233 | ||
234 | sort_list = kzalloc( | |
235 | sizeof(struct segment_info) * dev_info->num_of_segments, | |
236 | GFP_KERNEL); | |
237 | if (sort_list == NULL) | |
238 | return -ENOMEM; | |
239 | i = 0; | |
240 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
241 | memcpy(&sort_list[i], entry, sizeof(struct segment_info)); | |
242 | i++; | |
243 | } | |
244 | ||
245 | /* sort segments */ | |
246 | for (i = 0; i < dev_info->num_of_segments; i++) | |
247 | for (j = 0; j < dev_info->num_of_segments; j++) | |
248 | if (sort_list[j].start > sort_list[i].start) { | |
249 | memcpy(&temp, &sort_list[i], | |
250 | sizeof(struct segment_info)); | |
251 | memcpy(&sort_list[i], &sort_list[j], | |
252 | sizeof(struct segment_info)); | |
253 | memcpy(&sort_list[j], &temp, | |
254 | sizeof(struct segment_info)); | |
255 | } | |
256 | ||
257 | /* check continuity */ | |
258 | for (i = 0; i < dev_info->num_of_segments - 1; i++) { | |
259 | if ((sort_list[i].end + 1) != sort_list[i+1].start) { | |
93098bf0 HY |
260 | pr_err("Adjacent DCSSs %s and %s are not " |
261 | "contiguous\n", sort_list[i].segment_name, | |
262 | sort_list[i+1].segment_name); | |
b2300b9e HY |
263 | rc = -EINVAL; |
264 | goto out; | |
265 | } | |
266 | /* EN and EW are allowed in a block device */ | |
267 | if (sort_list[i].segment_type != sort_list[i+1].segment_type) { | |
268 | if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || | |
269 | (sort_list[i].segment_type == SEG_TYPE_ER) || | |
270 | !(sort_list[i+1].segment_type & | |
271 | SEGMENT_EXCLUSIVE) || | |
272 | (sort_list[i+1].segment_type == SEG_TYPE_ER)) { | |
93098bf0 HY |
273 | pr_err("DCSS %s and DCSS %s have " |
274 | "incompatible types\n", | |
275 | sort_list[i].segment_name, | |
276 | sort_list[i+1].segment_name); | |
b2300b9e HY |
277 | rc = -EINVAL; |
278 | goto out; | |
279 | } | |
280 | } | |
281 | } | |
282 | rc = 0; | |
283 | out: | |
284 | kfree(sort_list); | |
285 | return rc; | |
286 | } | |
287 | ||
288 | /* | |
289 | * Load a segment | |
290 | */ | |
291 | static int | |
292 | dcssblk_load_segment(char *name, struct segment_info **seg_info) | |
293 | { | |
294 | int rc; | |
295 | ||
296 | /* already loaded? */ | |
297 | down_read(&dcssblk_devices_sem); | |
298 | *seg_info = dcssblk_get_segment_by_name(name); | |
299 | up_read(&dcssblk_devices_sem); | |
300 | if (*seg_info != NULL) | |
301 | return -EEXIST; | |
302 | ||
303 | /* get a struct segment_info */ | |
304 | *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); | |
305 | if (*seg_info == NULL) | |
306 | return -ENOMEM; | |
307 | ||
308 | strcpy((*seg_info)->segment_name, name); | |
309 | ||
310 | /* load the segment */ | |
311 | rc = segment_load(name, SEGMENT_SHARED, | |
312 | &(*seg_info)->start, &(*seg_info)->end); | |
313 | if (rc < 0) { | |
314 | segment_warning(rc, (*seg_info)->segment_name); | |
315 | kfree(*seg_info); | |
316 | } else { | |
317 | INIT_LIST_HEAD(&(*seg_info)->lh); | |
318 | (*seg_info)->segment_type = rc; | |
319 | } | |
320 | return rc; | |
321 | } | |
322 | ||
1da177e4 LT |
323 | /* |
324 | * device attribute for switching shared/nonshared (exclusive) | |
325 | * operation (show + store) | |
326 | */ | |
327 | static ssize_t | |
e404e274 | 328 | dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
329 | { |
330 | struct dcssblk_dev_info *dev_info; | |
331 | ||
332 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
333 | return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); | |
334 | } | |
335 | ||
336 | static ssize_t | |
e404e274 | 337 | dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
338 | { |
339 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 340 | struct segment_info *entry, *temp; |
1da177e4 LT |
341 | int rc; |
342 | ||
ded77fb4 | 343 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 344 | return -EINVAL; |
1da177e4 LT |
345 | down_write(&dcssblk_devices_sem); |
346 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
347 | if (atomic_read(&dev_info->use_count)) { | |
1da177e4 LT |
348 | rc = -EBUSY; |
349 | goto out; | |
350 | } | |
351 | if (inbuf[0] == '1') { | |
b2300b9e HY |
352 | /* reload segments in shared mode */ |
353 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
354 | rc = segment_modify_shared(entry->segment_name, | |
355 | SEGMENT_SHARED); | |
356 | if (rc < 0) { | |
357 | BUG_ON(rc == -EINVAL); | |
358 | if (rc != -EAGAIN) | |
359 | goto removeseg; | |
1da177e4 LT |
360 | } |
361 | } | |
b2300b9e HY |
362 | dev_info->is_shared = 1; |
363 | switch (dev_info->segment_type) { | |
364 | case SEG_TYPE_SR: | |
365 | case SEG_TYPE_ER: | |
366 | case SEG_TYPE_SC: | |
367 | set_disk_ro(dev_info->gd, 1); | |
368 | } | |
1da177e4 | 369 | } else if (inbuf[0] == '0') { |
b2300b9e | 370 | /* reload segments in exclusive mode */ |
1da177e4 | 371 | if (dev_info->segment_type == SEG_TYPE_SC) { |
93098bf0 HY |
372 | pr_err("DCSS %s is of type SC and cannot be " |
373 | "loaded as exclusive-writable\n", | |
374 | dev_info->segment_name); | |
1da177e4 LT |
375 | rc = -EINVAL; |
376 | goto out; | |
377 | } | |
b2300b9e HY |
378 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
379 | rc = segment_modify_shared(entry->segment_name, | |
380 | SEGMENT_EXCLUSIVE); | |
381 | if (rc < 0) { | |
382 | BUG_ON(rc == -EINVAL); | |
383 | if (rc != -EAGAIN) | |
384 | goto removeseg; | |
385 | } | |
1da177e4 | 386 | } |
b2300b9e HY |
387 | dev_info->is_shared = 0; |
388 | set_disk_ro(dev_info->gd, 0); | |
1da177e4 | 389 | } else { |
1da177e4 LT |
390 | rc = -EINVAL; |
391 | goto out; | |
392 | } | |
393 | rc = count; | |
394 | goto out; | |
395 | ||
396 | removeseg: | |
93098bf0 HY |
397 | pr_err("DCSS device %s is removed after a failed access mode " |
398 | "change\n", dev_info->segment_name); | |
b2300b9e HY |
399 | temp = entry; |
400 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
401 | if (entry != temp) | |
402 | segment_unload(entry->segment_name); | |
403 | } | |
1da177e4 LT |
404 | list_del(&dev_info->lh); |
405 | ||
7a2765f6 DW |
406 | kill_dax(dev_info->dax_dev); |
407 | put_dax(dev_info->dax_dev); | |
1da177e4 | 408 | del_gendisk(dev_info->gd); |
1312f40e | 409 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
410 | dev_info->gd->queue = NULL; |
411 | put_disk(dev_info->gd); | |
0b60f9ea TH |
412 | up_write(&dcssblk_devices_sem); |
413 | ||
414 | if (device_remove_file_self(dev, attr)) { | |
415 | device_unregister(dev); | |
416 | put_device(dev); | |
417 | } | |
418 | return rc; | |
1da177e4 LT |
419 | out: |
420 | up_write(&dcssblk_devices_sem); | |
421 | return rc; | |
422 | } | |
521b3d79 SO |
423 | static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, |
424 | dcssblk_shared_store); | |
1da177e4 LT |
425 | |
426 | /* | |
427 | * device attribute for save operation on current copy | |
428 | * of the segment. If the segment is busy, saving will | |
429 | * become pending until it gets released, which can be | |
430 | * undone by storing a non-true value to this entry. | |
431 | * (show + store) | |
432 | */ | |
433 | static ssize_t | |
e404e274 | 434 | dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
435 | { |
436 | struct dcssblk_dev_info *dev_info; | |
437 | ||
438 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
439 | return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); | |
440 | } | |
441 | ||
442 | static ssize_t | |
e404e274 | 443 | dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
444 | { |
445 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 446 | struct segment_info *entry; |
1da177e4 | 447 | |
ded77fb4 | 448 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 449 | return -EINVAL; |
1da177e4 LT |
450 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
451 | ||
452 | down_write(&dcssblk_devices_sem); | |
453 | if (inbuf[0] == '1') { | |
454 | if (atomic_read(&dev_info->use_count) == 0) { | |
455 | // device is idle => we save immediately | |
93098bf0 HY |
456 | pr_info("All DCSSs that map to device %s are " |
457 | "saved\n", dev_info->segment_name); | |
b2300b9e | 458 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
459 | if (entry->segment_type == SEG_TYPE_EN || |
460 | entry->segment_type == SEG_TYPE_SN) | |
461 | pr_warn("DCSS %s is of type SN or EN" | |
462 | " and cannot be saved\n", | |
463 | entry->segment_name); | |
464 | else | |
465 | segment_save(entry->segment_name); | |
b2300b9e | 466 | } |
1da177e4 LT |
467 | } else { |
468 | // device is busy => we save it when it becomes | |
469 | // idle in dcssblk_release | |
93098bf0 HY |
470 | pr_info("Device %s is in use, its DCSSs will be " |
471 | "saved when it becomes idle\n", | |
472 | dev_info->segment_name); | |
1da177e4 LT |
473 | dev_info->save_pending = 1; |
474 | } | |
475 | } else if (inbuf[0] == '0') { | |
476 | if (dev_info->save_pending) { | |
477 | // device is busy & the user wants to undo his save | |
478 | // request | |
479 | dev_info->save_pending = 0; | |
93098bf0 HY |
480 | pr_info("A pending save request for device %s " |
481 | "has been canceled\n", | |
482 | dev_info->segment_name); | |
1da177e4 LT |
483 | } |
484 | } else { | |
485 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
486 | return -EINVAL; |
487 | } | |
488 | up_write(&dcssblk_devices_sem); | |
489 | return count; | |
490 | } | |
521b3d79 SO |
491 | static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, |
492 | dcssblk_save_store); | |
1da177e4 | 493 | |
b2300b9e HY |
494 | /* |
495 | * device attribute for showing all segments in a device | |
496 | */ | |
497 | static ssize_t | |
498 | dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, | |
499 | char *buf) | |
500 | { | |
501 | int i; | |
502 | ||
503 | struct dcssblk_dev_info *dev_info; | |
504 | struct segment_info *entry; | |
505 | ||
506 | down_read(&dcssblk_devices_sem); | |
507 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
508 | i = 0; | |
509 | buf[0] = '\0'; | |
510 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
511 | strcpy(&buf[i], entry->segment_name); | |
512 | i += strlen(entry->segment_name); | |
513 | buf[i] = '\n'; | |
514 | i++; | |
515 | } | |
516 | up_read(&dcssblk_devices_sem); | |
517 | return i; | |
518 | } | |
521b3d79 SO |
519 | static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); |
520 | ||
521 | static struct attribute *dcssblk_dev_attrs[] = { | |
522 | &dev_attr_shared.attr, | |
523 | &dev_attr_save.attr, | |
524 | &dev_attr_seglist.attr, | |
525 | NULL, | |
526 | }; | |
527 | static struct attribute_group dcssblk_dev_attr_group = { | |
528 | .attrs = dcssblk_dev_attrs, | |
529 | }; | |
530 | static const struct attribute_group *dcssblk_dev_attr_groups[] = { | |
531 | &dcssblk_dev_attr_group, | |
532 | NULL, | |
533 | }; | |
b2300b9e | 534 | |
1da177e4 LT |
535 | /* |
536 | * device attribute for adding devices | |
537 | */ | |
538 | static ssize_t | |
e404e274 | 539 | dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 540 | { |
b2300b9e | 541 | int rc, i, j, num_of_segments; |
1da177e4 | 542 | struct dcssblk_dev_info *dev_info; |
b2300b9e | 543 | struct segment_info *seg_info, *temp; |
1da177e4 LT |
544 | char *local_buf; |
545 | unsigned long seg_byte_size; | |
546 | ||
547 | dev_info = NULL; | |
b2300b9e | 548 | seg_info = NULL; |
1da177e4 LT |
549 | if (dev != dcssblk_root_dev) { |
550 | rc = -EINVAL; | |
551 | goto out_nobuf; | |
552 | } | |
b2300b9e HY |
553 | if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { |
554 | rc = -ENAMETOOLONG; | |
555 | goto out_nobuf; | |
556 | } | |
557 | ||
1da177e4 LT |
558 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
559 | if (local_buf == NULL) { | |
560 | rc = -ENOMEM; | |
561 | goto out_nobuf; | |
562 | } | |
b2300b9e | 563 | |
1da177e4 LT |
564 | /* |
565 | * parse input | |
566 | */ | |
b2300b9e | 567 | num_of_segments = 0; |
3a9f9183 | 568 | for (i = 0; (i < count && (buf[i] != '\0') && (buf[i] != '\n')); i++) { |
42cfc6b5 MS |
569 | for (j = i; j < count && |
570 | (buf[j] != ':') && | |
b2300b9e | 571 | (buf[j] != '\0') && |
42cfc6b5 | 572 | (buf[j] != '\n'); j++) { |
b2300b9e HY |
573 | local_buf[j-i] = toupper(buf[j]); |
574 | } | |
575 | local_buf[j-i] = '\0'; | |
576 | if (((j - i) == 0) || ((j - i) > 8)) { | |
577 | rc = -ENAMETOOLONG; | |
578 | goto seg_list_del; | |
579 | } | |
580 | ||
581 | rc = dcssblk_load_segment(local_buf, &seg_info); | |
582 | if (rc < 0) | |
583 | goto seg_list_del; | |
584 | /* | |
585 | * get a struct dcssblk_dev_info | |
586 | */ | |
587 | if (num_of_segments == 0) { | |
588 | dev_info = kzalloc(sizeof(struct dcssblk_dev_info), | |
589 | GFP_KERNEL); | |
590 | if (dev_info == NULL) { | |
591 | rc = -ENOMEM; | |
592 | goto out; | |
593 | } | |
594 | strcpy(dev_info->segment_name, local_buf); | |
595 | dev_info->segment_type = seg_info->segment_type; | |
596 | INIT_LIST_HEAD(&dev_info->seg_list); | |
597 | } | |
598 | list_add_tail(&seg_info->lh, &dev_info->seg_list); | |
599 | num_of_segments++; | |
600 | i = j; | |
601 | ||
602 | if ((buf[j] == '\0') || (buf[j] == '\n')) | |
603 | break; | |
1da177e4 | 604 | } |
b2300b9e HY |
605 | |
606 | /* no trailing colon at the end of the input */ | |
607 | if ((i > 0) && (buf[i-1] == ':')) { | |
1da177e4 | 608 | rc = -ENAMETOOLONG; |
b2300b9e | 609 | goto seg_list_del; |
1da177e4 | 610 | } |
b2300b9e HY |
611 | strlcpy(local_buf, buf, i + 1); |
612 | dev_info->num_of_segments = num_of_segments; | |
613 | rc = dcssblk_is_continuous(dev_info); | |
614 | if (rc < 0) | |
615 | goto seg_list_del; | |
616 | ||
617 | dev_info->start = dcssblk_find_lowest_addr(dev_info); | |
618 | dev_info->end = dcssblk_find_highest_addr(dev_info); | |
1da177e4 | 619 | |
ef283688 | 620 | dev_set_name(&dev_info->dev, "%s", dev_info->segment_name); |
1da177e4 | 621 | dev_info->dev.release = dcssblk_release_segment; |
521b3d79 | 622 | dev_info->dev.groups = dcssblk_dev_attr_groups; |
1da177e4 | 623 | INIT_LIST_HEAD(&dev_info->lh); |
1da177e4 LT |
624 | dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); |
625 | if (dev_info->gd == NULL) { | |
626 | rc = -ENOMEM; | |
b2300b9e | 627 | goto seg_list_del; |
1da177e4 LT |
628 | } |
629 | dev_info->gd->major = dcssblk_major; | |
630 | dev_info->gd->fops = &dcssblk_devops; | |
631 | dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); | |
632 | dev_info->gd->queue = dev_info->dcssblk_queue; | |
633 | dev_info->gd->private_data = dev_info; | |
c5411dba | 634 | blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); |
e1defc4f | 635 | blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); |
8b904b5b | 636 | blk_queue_flag_set(QUEUE_FLAG_DAX, dev_info->dcssblk_queue); |
b2300b9e | 637 | |
1da177e4 LT |
638 | seg_byte_size = (dev_info->end - dev_info->start + 1); |
639 | set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors | |
93098bf0 HY |
640 | pr_info("Loaded %s with total size %lu bytes and capacity %lu " |
641 | "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); | |
1da177e4 | 642 | |
1da177e4 LT |
643 | dev_info->save_pending = 0; |
644 | dev_info->is_shared = 1; | |
645 | dev_info->dev.parent = dcssblk_root_dev; | |
646 | ||
647 | /* | |
b2300b9e | 648 | *get minor, add to list |
1da177e4 LT |
649 | */ |
650 | down_write(&dcssblk_devices_sem); | |
b2300b9e | 651 | if (dcssblk_get_segment_by_name(local_buf)) { |
04f64b57 | 652 | rc = -EEXIST; |
b2300b9e | 653 | goto release_gd; |
04f64b57 | 654 | } |
1da177e4 | 655 | rc = dcssblk_assign_free_minor(dev_info); |
b2300b9e HY |
656 | if (rc) |
657 | goto release_gd; | |
1da177e4 | 658 | sprintf(dev_info->gd->disk_name, "dcssblk%d", |
d0591485 | 659 | dev_info->gd->first_minor); |
1da177e4 LT |
660 | list_add_tail(&dev_info->lh, &dcssblk_devices); |
661 | ||
662 | if (!try_module_get(THIS_MODULE)) { | |
663 | rc = -ENODEV; | |
b2300b9e | 664 | goto dev_list_del; |
1da177e4 LT |
665 | } |
666 | /* | |
667 | * register the device | |
668 | */ | |
669 | rc = device_register(&dev_info->dev); | |
b2300b9e | 670 | if (rc) |
521b3d79 | 671 | goto put_dev; |
1da177e4 | 672 | |
7a2765f6 DW |
673 | dev_info->dax_dev = alloc_dax(dev_info, dev_info->gd->disk_name, |
674 | &dcssblk_dax_ops); | |
675 | if (!dev_info->dax_dev) { | |
676 | rc = -ENOMEM; | |
677 | goto put_dev; | |
678 | } | |
679 | ||
521b3d79 | 680 | get_device(&dev_info->dev); |
0d52c756 | 681 | device_add_disk(&dev_info->dev, dev_info->gd); |
436d1bc7 | 682 | |
1da177e4 LT |
683 | switch (dev_info->segment_type) { |
684 | case SEG_TYPE_SR: | |
685 | case SEG_TYPE_ER: | |
686 | case SEG_TYPE_SC: | |
687 | set_disk_ro(dev_info->gd,1); | |
688 | break; | |
689 | default: | |
690 | set_disk_ro(dev_info->gd,0); | |
691 | break; | |
692 | } | |
1da177e4 LT |
693 | up_write(&dcssblk_devices_sem); |
694 | rc = count; | |
695 | goto out; | |
696 | ||
521b3d79 | 697 | put_dev: |
1da177e4 | 698 | list_del(&dev_info->lh); |
1312f40e | 699 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
700 | dev_info->gd->queue = NULL; |
701 | put_disk(dev_info->gd); | |
b2300b9e HY |
702 | list_for_each_entry(seg_info, &dev_info->seg_list, lh) { |
703 | segment_unload(seg_info->segment_name); | |
704 | } | |
1da177e4 LT |
705 | put_device(&dev_info->dev); |
706 | up_write(&dcssblk_devices_sem); | |
707 | goto out; | |
b2300b9e | 708 | dev_list_del: |
1da177e4 | 709 | list_del(&dev_info->lh); |
b2300b9e | 710 | release_gd: |
1312f40e | 711 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
712 | dev_info->gd->queue = NULL; |
713 | put_disk(dev_info->gd); | |
b2300b9e HY |
714 | up_write(&dcssblk_devices_sem); |
715 | seg_list_del: | |
716 | if (dev_info == NULL) | |
717 | goto out; | |
718 | list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) { | |
719 | list_del(&seg_info->lh); | |
720 | segment_unload(seg_info->segment_name); | |
721 | kfree(seg_info); | |
722 | } | |
1da177e4 LT |
723 | kfree(dev_info); |
724 | out: | |
725 | kfree(local_buf); | |
726 | out_nobuf: | |
727 | return rc; | |
728 | } | |
729 | ||
730 | /* | |
731 | * device attribute for removing devices | |
732 | */ | |
733 | static ssize_t | |
e404e274 | 734 | dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
735 | { |
736 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 737 | struct segment_info *entry; |
1da177e4 LT |
738 | int rc, i; |
739 | char *local_buf; | |
740 | ||
741 | if (dev != dcssblk_root_dev) { | |
742 | return -EINVAL; | |
743 | } | |
744 | local_buf = kmalloc(count + 1, GFP_KERNEL); | |
745 | if (local_buf == NULL) { | |
746 | return -ENOMEM; | |
747 | } | |
748 | /* | |
749 | * parse input | |
750 | */ | |
42cfc6b5 | 751 | for (i = 0; (i < count && (*(buf+i)!='\0') && (*(buf+i)!='\n')); i++) { |
1da177e4 LT |
752 | local_buf[i] = toupper(buf[i]); |
753 | } | |
754 | local_buf[i] = '\0'; | |
755 | if ((i == 0) || (i > 8)) { | |
756 | rc = -ENAMETOOLONG; | |
757 | goto out_buf; | |
758 | } | |
759 | ||
760 | down_write(&dcssblk_devices_sem); | |
761 | dev_info = dcssblk_get_device_by_name(local_buf); | |
762 | if (dev_info == NULL) { | |
763 | up_write(&dcssblk_devices_sem); | |
baebc70a JP |
764 | pr_warn("Device %s cannot be removed because it is not a known device\n", |
765 | local_buf); | |
1da177e4 LT |
766 | rc = -ENODEV; |
767 | goto out_buf; | |
768 | } | |
769 | if (atomic_read(&dev_info->use_count) != 0) { | |
770 | up_write(&dcssblk_devices_sem); | |
baebc70a JP |
771 | pr_warn("Device %s cannot be removed while it is in use\n", |
772 | local_buf); | |
1da177e4 LT |
773 | rc = -EBUSY; |
774 | goto out_buf; | |
775 | } | |
1da177e4 | 776 | |
b2300b9e | 777 | list_del(&dev_info->lh); |
7a2765f6 DW |
778 | kill_dax(dev_info->dax_dev); |
779 | put_dax(dev_info->dax_dev); | |
1da177e4 | 780 | del_gendisk(dev_info->gd); |
1312f40e | 781 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
782 | dev_info->gd->queue = NULL; |
783 | put_disk(dev_info->gd); | |
b2300b9e HY |
784 | |
785 | /* unload all related segments */ | |
786 | list_for_each_entry(entry, &dev_info->seg_list, lh) | |
787 | segment_unload(entry->segment_name); | |
788 | ||
1da177e4 LT |
789 | up_write(&dcssblk_devices_sem); |
790 | ||
1378a683 GS |
791 | device_unregister(&dev_info->dev); |
792 | put_device(&dev_info->dev); | |
793 | ||
1da177e4 LT |
794 | rc = count; |
795 | out_buf: | |
796 | kfree(local_buf); | |
797 | return rc; | |
798 | } | |
799 | ||
800 | static int | |
46d74326 | 801 | dcssblk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
802 | { |
803 | struct dcssblk_dev_info *dev_info; | |
804 | int rc; | |
805 | ||
46d74326 | 806 | dev_info = bdev->bd_disk->private_data; |
1da177e4 LT |
807 | if (NULL == dev_info) { |
808 | rc = -ENODEV; | |
809 | goto out; | |
810 | } | |
811 | atomic_inc(&dev_info->use_count); | |
46d74326 | 812 | bdev->bd_block_size = 4096; |
1da177e4 LT |
813 | rc = 0; |
814 | out: | |
815 | return rc; | |
816 | } | |
817 | ||
db2a144b | 818 | static void |
46d74326 | 819 | dcssblk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 820 | { |
46d74326 | 821 | struct dcssblk_dev_info *dev_info = disk->private_data; |
b2300b9e | 822 | struct segment_info *entry; |
1da177e4 | 823 | |
46d74326 | 824 | if (!dev_info) { |
db2a144b AV |
825 | WARN_ON(1); |
826 | return; | |
1da177e4 LT |
827 | } |
828 | down_write(&dcssblk_devices_sem); | |
829 | if (atomic_dec_and_test(&dev_info->use_count) | |
830 | && (dev_info->save_pending)) { | |
93098bf0 HY |
831 | pr_info("Device %s has become idle and is being saved " |
832 | "now\n", dev_info->segment_name); | |
b2300b9e | 833 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
834 | if (entry->segment_type == SEG_TYPE_EN || |
835 | entry->segment_type == SEG_TYPE_SN) | |
836 | pr_warn("DCSS %s is of type SN or EN and cannot" | |
837 | " be saved\n", entry->segment_name); | |
838 | else | |
839 | segment_save(entry->segment_name); | |
b2300b9e | 840 | } |
1da177e4 LT |
841 | dev_info->save_pending = 0; |
842 | } | |
843 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
844 | } |
845 | ||
dece1635 | 846 | static blk_qc_t |
165125e1 | 847 | dcssblk_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
848 | { |
849 | struct dcssblk_dev_info *dev_info; | |
7988613b KO |
850 | struct bio_vec bvec; |
851 | struct bvec_iter iter; | |
1da177e4 LT |
852 | unsigned long index; |
853 | unsigned long page_addr; | |
854 | unsigned long source_addr; | |
855 | unsigned long bytes_done; | |
1da177e4 | 856 | |
af67c31f | 857 | blk_queue_split(q, &bio); |
54efd50b | 858 | |
1da177e4 | 859 | bytes_done = 0; |
74d46992 | 860 | dev_info = bio->bi_disk->private_data; |
1da177e4 LT |
861 | if (dev_info == NULL) |
862 | goto fail; | |
4f024f37 KO |
863 | if ((bio->bi_iter.bi_sector & 7) != 0 || |
864 | (bio->bi_iter.bi_size & 4095) != 0) | |
1da177e4 LT |
865 | /* Request is not page-aligned. */ |
866 | goto fail; | |
74d46992 | 867 | if (bio_end_sector(bio) > get_capacity(bio->bi_disk)) { |
1da177e4 LT |
868 | /* Request beyond end of DCSS segment. */ |
869 | goto fail; | |
870 | } | |
420edbcc CO |
871 | /* verify data transfer direction */ |
872 | if (dev_info->is_shared) { | |
873 | switch (dev_info->segment_type) { | |
874 | case SEG_TYPE_SR: | |
875 | case SEG_TYPE_ER: | |
876 | case SEG_TYPE_SC: | |
877 | /* cannot write to these segments */ | |
878 | if (bio_data_dir(bio) == WRITE) { | |
baebc70a JP |
879 | pr_warn("Writing to %s failed because it is a read-only device\n", |
880 | dev_name(&dev_info->dev)); | |
420edbcc CO |
881 | goto fail; |
882 | } | |
883 | } | |
884 | } | |
885 | ||
4f024f37 | 886 | index = (bio->bi_iter.bi_sector >> 3); |
7988613b | 887 | bio_for_each_segment(bvec, bio, iter) { |
1da177e4 | 888 | page_addr = (unsigned long) |
7988613b | 889 | page_address(bvec.bv_page) + bvec.bv_offset; |
1da177e4 | 890 | source_addr = dev_info->start + (index<<12) + bytes_done; |
7988613b | 891 | if (unlikely((page_addr & 4095) != 0) || (bvec.bv_len & 4095) != 0) |
1da177e4 LT |
892 | // More paranoia. |
893 | goto fail; | |
894 | if (bio_data_dir(bio) == READ) { | |
895 | memcpy((void*)page_addr, (void*)source_addr, | |
7988613b | 896 | bvec.bv_len); |
1da177e4 LT |
897 | } else { |
898 | memcpy((void*)source_addr, (void*)page_addr, | |
7988613b | 899 | bvec.bv_len); |
1da177e4 | 900 | } |
7988613b | 901 | bytes_done += bvec.bv_len; |
1da177e4 | 902 | } |
4246a0b6 | 903 | bio_endio(bio); |
dece1635 | 904 | return BLK_QC_T_NONE; |
1da177e4 | 905 | fail: |
6712ecf8 | 906 | bio_io_error(bio); |
dece1635 | 907 | return BLK_QC_T_NONE; |
420edbcc CO |
908 | } |
909 | ||
dd22f551 | 910 | static long |
7a2765f6 DW |
911 | __dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff, |
912 | long nr_pages, void **kaddr, pfn_t *pfn) | |
913 | { | |
914 | resource_size_t offset = pgoff * PAGE_SIZE; | |
915 | unsigned long dev_sz; | |
916 | ||
917 | dev_sz = dev_info->end - dev_info->start + 1; | |
918 | *kaddr = (void *) dev_info->start + offset; | |
785a3fab DW |
919 | *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), |
920 | PFN_DEV|PFN_SPECIAL); | |
7a2765f6 DW |
921 | |
922 | return (dev_sz - offset) / PAGE_SIZE; | |
923 | } | |
924 | ||
7a2765f6 DW |
925 | static long |
926 | dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, | |
927 | long nr_pages, void **kaddr, pfn_t *pfn) | |
928 | { | |
929 | struct dcssblk_dev_info *dev_info = dax_get_private(dax_dev); | |
30afcb4b | 930 | |
7a2765f6 | 931 | return __dcssblk_direct_access(dev_info, pgoff, nr_pages, kaddr, pfn); |
1da177e4 LT |
932 | } |
933 | ||
934 | static void | |
935 | dcssblk_check_params(void) | |
936 | { | |
937 | int rc, i, j, k; | |
b2300b9e | 938 | char buf[DCSSBLK_PARM_LEN + 1]; |
1da177e4 LT |
939 | struct dcssblk_dev_info *dev_info; |
940 | ||
941 | for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); | |
942 | i++) { | |
42cfc6b5 MS |
943 | for (j = i; (j < DCSSBLK_PARM_LEN) && |
944 | (dcssblk_segments[j] != ',') && | |
1da177e4 | 945 | (dcssblk_segments[j] != '\0') && |
42cfc6b5 | 946 | (dcssblk_segments[j] != '('); j++) |
1da177e4 LT |
947 | { |
948 | buf[j-i] = dcssblk_segments[j]; | |
949 | } | |
950 | buf[j-i] = '\0'; | |
f901e5d1 | 951 | rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); |
1da177e4 | 952 | if ((rc >= 0) && (dcssblk_segments[j] == '(')) { |
b2300b9e | 953 | for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) |
1da177e4 | 954 | buf[k] = toupper(buf[k]); |
b2300b9e | 955 | buf[k] = '\0'; |
1da177e4 LT |
956 | if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { |
957 | down_read(&dcssblk_devices_sem); | |
958 | dev_info = dcssblk_get_device_by_name(buf); | |
959 | up_read(&dcssblk_devices_sem); | |
960 | if (dev_info) | |
961 | dcssblk_shared_store(&dev_info->dev, | |
f901e5d1 | 962 | NULL, "0\n", 2); |
1da177e4 LT |
963 | } |
964 | } | |
965 | while ((dcssblk_segments[j] != ',') && | |
966 | (dcssblk_segments[j] != '\0')) | |
967 | { | |
968 | j++; | |
969 | } | |
970 | if (dcssblk_segments[j] == '\0') | |
971 | break; | |
972 | i = j; | |
973 | } | |
974 | } | |
975 | ||
c369527f GS |
976 | /* |
977 | * Suspend / Resume | |
978 | */ | |
979 | static int dcssblk_freeze(struct device *dev) | |
980 | { | |
981 | struct dcssblk_dev_info *dev_info; | |
982 | int rc = 0; | |
983 | ||
984 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
985 | switch (dev_info->segment_type) { | |
986 | case SEG_TYPE_SR: | |
987 | case SEG_TYPE_ER: | |
988 | case SEG_TYPE_SC: | |
989 | if (!dev_info->is_shared) | |
990 | rc = -EINVAL; | |
991 | break; | |
992 | default: | |
993 | rc = -EINVAL; | |
994 | break; | |
995 | } | |
996 | if (rc) | |
997 | break; | |
998 | } | |
999 | if (rc) | |
2c48c4d6 CB |
1000 | pr_err("Suspending the system failed because DCSS device %s " |
1001 | "is writable\n", | |
c369527f GS |
1002 | dev_info->segment_name); |
1003 | return rc; | |
1004 | } | |
1005 | ||
1006 | static int dcssblk_restore(struct device *dev) | |
1007 | { | |
1008 | struct dcssblk_dev_info *dev_info; | |
1009 | struct segment_info *entry; | |
1010 | unsigned long start, end; | |
1011 | int rc = 0; | |
1012 | ||
1013 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
1014 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
1015 | segment_unload(entry->segment_name); | |
1016 | rc = segment_load(entry->segment_name, SEGMENT_SHARED, | |
1017 | &start, &end); | |
1018 | if (rc < 0) { | |
1019 | // TODO in_use check ? | |
1020 | segment_warning(rc, entry->segment_name); | |
1021 | goto out_panic; | |
1022 | } | |
1023 | if (start != entry->start || end != entry->end) { | |
2c48c4d6 CB |
1024 | pr_err("The address range of DCSS %s changed " |
1025 | "while the system was suspended\n", | |
c369527f GS |
1026 | entry->segment_name); |
1027 | goto out_panic; | |
1028 | } | |
1029 | } | |
1030 | } | |
1031 | return 0; | |
1032 | out_panic: | |
1033 | panic("fatal dcssblk resume error\n"); | |
1034 | } | |
1035 | ||
1036 | static int dcssblk_thaw(struct device *dev) | |
1037 | { | |
1038 | return 0; | |
1039 | } | |
1040 | ||
47145210 | 1041 | static const struct dev_pm_ops dcssblk_pm_ops = { |
c369527f GS |
1042 | .freeze = dcssblk_freeze, |
1043 | .thaw = dcssblk_thaw, | |
1044 | .restore = dcssblk_restore, | |
1045 | }; | |
1046 | ||
1047 | static struct platform_driver dcssblk_pdrv = { | |
1048 | .driver = { | |
1049 | .name = "dcssblk", | |
c369527f GS |
1050 | .pm = &dcssblk_pm_ops, |
1051 | }, | |
1052 | }; | |
1053 | ||
1054 | static struct platform_device *dcssblk_pdev; | |
1055 | ||
1056 | ||
1da177e4 LT |
1057 | /* |
1058 | * The init/exit functions. | |
1059 | */ | |
1060 | static void __exit | |
1061 | dcssblk_exit(void) | |
1062 | { | |
c369527f GS |
1063 | platform_device_unregister(dcssblk_pdev); |
1064 | platform_driver_unregister(&dcssblk_pdrv); | |
035da16f | 1065 | root_device_unregister(dcssblk_root_dev); |
00d59405 | 1066 | unregister_blkdev(dcssblk_major, DCSSBLK_NAME); |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | static int __init | |
1070 | dcssblk_init(void) | |
1071 | { | |
1072 | int rc; | |
1073 | ||
c369527f GS |
1074 | rc = platform_driver_register(&dcssblk_pdrv); |
1075 | if (rc) | |
1da177e4 | 1076 | return rc; |
c369527f GS |
1077 | |
1078 | dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL, | |
1079 | 0); | |
1080 | if (IS_ERR(dcssblk_pdev)) { | |
1081 | rc = PTR_ERR(dcssblk_pdev); | |
1082 | goto out_pdrv; | |
1da177e4 | 1083 | } |
c369527f GS |
1084 | |
1085 | dcssblk_root_dev = root_device_register("dcssblk"); | |
1086 | if (IS_ERR(dcssblk_root_dev)) { | |
1087 | rc = PTR_ERR(dcssblk_root_dev); | |
1088 | goto out_pdev; | |
1da177e4 | 1089 | } |
c369527f GS |
1090 | rc = device_create_file(dcssblk_root_dev, &dev_attr_add); |
1091 | if (rc) | |
1092 | goto out_root; | |
1093 | rc = device_create_file(dcssblk_root_dev, &dev_attr_remove); | |
1094 | if (rc) | |
1095 | goto out_root; | |
1da177e4 | 1096 | rc = register_blkdev(0, DCSSBLK_NAME); |
c369527f GS |
1097 | if (rc < 0) |
1098 | goto out_root; | |
1da177e4 LT |
1099 | dcssblk_major = rc; |
1100 | init_rwsem(&dcssblk_devices_sem); | |
1101 | ||
1102 | dcssblk_check_params(); | |
1da177e4 | 1103 | return 0; |
c369527f GS |
1104 | |
1105 | out_root: | |
1106 | root_device_unregister(dcssblk_root_dev); | |
1107 | out_pdev: | |
1108 | platform_device_unregister(dcssblk_pdev); | |
1109 | out_pdrv: | |
1110 | platform_driver_unregister(&dcssblk_pdrv); | |
1111 | return rc; | |
1da177e4 LT |
1112 | } |
1113 | ||
1114 | module_init(dcssblk_init); | |
1115 | module_exit(dcssblk_exit); | |
1116 | ||
1117 | module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); | |
1118 | MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " | |
b2300b9e HY |
1119 | "comma-separated list, names in each set separated " |
1120 | "by commas are separated by colons, each set contains " | |
1121 | "names of contiguous segments and each name max. 8 chars.\n" | |
1122 | "Adding \"(local)\" to the end of each set equals echoing 0 " | |
1123 | "to /sys/devices/dcssblk/<device name>/shared after loading " | |
1124 | "the contiguous segments - \n" | |
1125 | "e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\""); | |
1da177e4 LT |
1126 | |
1127 | MODULE_LICENSE("GPL"); |