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Commit | Line | Data |
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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 | ||
b3a9a0c3 DW |
54 | static size_t dcssblk_dax_copy_to_iter(struct dax_device *dax_dev, |
55 | pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) | |
56 | { | |
57 | return copy_to_iter(addr, bytes, i); | |
58 | } | |
59 | ||
7a2765f6 DW |
60 | static const struct dax_operations dcssblk_dax_ops = { |
61 | .direct_access = dcssblk_dax_direct_access, | |
5d61e43b | 62 | .copy_from_iter = dcssblk_dax_copy_from_iter, |
b3a9a0c3 | 63 | .copy_to_iter = dcssblk_dax_copy_to_iter, |
1da177e4 LT |
64 | }; |
65 | ||
b2300b9e HY |
66 | struct dcssblk_dev_info { |
67 | struct list_head lh; | |
68 | struct device dev; | |
98df67b3 | 69 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
70 | atomic_t use_count; |
71 | struct gendisk *gd; | |
72 | unsigned long start; | |
73 | unsigned long end; | |
74 | int segment_type; | |
75 | unsigned char save_pending; | |
76 | unsigned char is_shared; | |
77 | struct request_queue *dcssblk_queue; | |
78 | int num_of_segments; | |
79 | struct list_head seg_list; | |
7a2765f6 | 80 | struct dax_device *dax_dev; |
b2300b9e HY |
81 | }; |
82 | ||
83 | struct segment_info { | |
84 | struct list_head lh; | |
98df67b3 | 85 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
86 | unsigned long start; |
87 | unsigned long end; | |
88 | int segment_type; | |
89 | }; | |
90 | ||
e404e274 | 91 | static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 92 | size_t count); |
e404e274 | 93 | static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 94 | size_t count); |
1da177e4 LT |
95 | |
96 | static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); | |
97 | static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); | |
1da177e4 LT |
98 | |
99 | static struct device *dcssblk_root_dev; | |
100 | ||
c11ca97e | 101 | static LIST_HEAD(dcssblk_devices); |
1da177e4 LT |
102 | static struct rw_semaphore dcssblk_devices_sem; |
103 | ||
104 | /* | |
105 | * release function for segment device. | |
106 | */ | |
107 | static void | |
108 | dcssblk_release_segment(struct device *dev) | |
109 | { | |
b2300b9e HY |
110 | struct dcssblk_dev_info *dev_info; |
111 | struct segment_info *entry, *temp; | |
112 | ||
113 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
114 | list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { | |
115 | list_del(&entry->lh); | |
116 | kfree(entry); | |
117 | } | |
118 | kfree(dev_info); | |
1da177e4 LT |
119 | module_put(THIS_MODULE); |
120 | } | |
121 | ||
122 | /* | |
123 | * get a minor number. needs to be called with | |
124 | * down_write(&dcssblk_devices_sem) and the | |
125 | * device needs to be enqueued before the semaphore is | |
126 | * freed. | |
127 | */ | |
4d284cac | 128 | static int |
1da177e4 LT |
129 | dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) |
130 | { | |
131 | int minor, found; | |
132 | struct dcssblk_dev_info *entry; | |
133 | ||
134 | if (dev_info == NULL) | |
135 | return -EINVAL; | |
136 | for (minor = 0; minor < (1<<MINORBITS); minor++) { | |
137 | found = 0; | |
138 | // test if minor available | |
139 | list_for_each_entry(entry, &dcssblk_devices, lh) | |
d0591485 | 140 | if (minor == entry->gd->first_minor) |
1da177e4 LT |
141 | found++; |
142 | if (!found) break; // got unused minor | |
143 | } | |
144 | if (found) | |
145 | return -EBUSY; | |
146 | dev_info->gd->first_minor = minor; | |
147 | return 0; | |
148 | } | |
149 | ||
150 | /* | |
151 | * get the struct dcssblk_dev_info from dcssblk_devices | |
152 | * for the given name. | |
153 | * down_read(&dcssblk_devices_sem) must be held. | |
154 | */ | |
155 | static struct dcssblk_dev_info * | |
156 | dcssblk_get_device_by_name(char *name) | |
157 | { | |
158 | struct dcssblk_dev_info *entry; | |
159 | ||
160 | list_for_each_entry(entry, &dcssblk_devices, lh) { | |
161 | if (!strcmp(name, entry->segment_name)) { | |
162 | return entry; | |
163 | } | |
164 | } | |
165 | return NULL; | |
166 | } | |
167 | ||
b2300b9e HY |
168 | /* |
169 | * get the struct segment_info from seg_list | |
170 | * for the given name. | |
171 | * down_read(&dcssblk_devices_sem) must be held. | |
172 | */ | |
173 | static struct segment_info * | |
174 | dcssblk_get_segment_by_name(char *name) | |
175 | { | |
176 | struct dcssblk_dev_info *dev_info; | |
177 | struct segment_info *entry; | |
178 | ||
179 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
180 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
181 | if (!strcmp(name, entry->segment_name)) | |
182 | return entry; | |
183 | } | |
184 | } | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | /* | |
189 | * get the highest address of the multi-segment block. | |
190 | */ | |
191 | static unsigned long | |
192 | dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) | |
193 | { | |
194 | unsigned long highest_addr; | |
195 | struct segment_info *entry; | |
196 | ||
197 | highest_addr = 0; | |
198 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
199 | if (highest_addr < entry->end) | |
200 | highest_addr = entry->end; | |
201 | } | |
202 | return highest_addr; | |
203 | } | |
204 | ||
205 | /* | |
206 | * get the lowest address of the multi-segment block. | |
207 | */ | |
208 | static unsigned long | |
209 | dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) | |
210 | { | |
211 | int set_first; | |
212 | unsigned long lowest_addr; | |
213 | struct segment_info *entry; | |
214 | ||
215 | set_first = 0; | |
216 | lowest_addr = 0; | |
217 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
218 | if (set_first == 0) { | |
219 | lowest_addr = entry->start; | |
220 | set_first = 1; | |
221 | } else { | |
222 | if (lowest_addr > entry->start) | |
223 | lowest_addr = entry->start; | |
224 | } | |
225 | } | |
226 | return lowest_addr; | |
227 | } | |
228 | ||
229 | /* | |
230 | * Check continuity of segments. | |
231 | */ | |
232 | static int | |
233 | dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) | |
234 | { | |
235 | int i, j, rc; | |
236 | struct segment_info *sort_list, *entry, temp; | |
237 | ||
238 | if (dev_info->num_of_segments <= 1) | |
239 | return 0; | |
240 | ||
6396bb22 KC |
241 | sort_list = kcalloc(dev_info->num_of_segments, |
242 | sizeof(struct segment_info), | |
243 | GFP_KERNEL); | |
b2300b9e HY |
244 | if (sort_list == NULL) |
245 | return -ENOMEM; | |
246 | i = 0; | |
247 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
248 | memcpy(&sort_list[i], entry, sizeof(struct segment_info)); | |
249 | i++; | |
250 | } | |
251 | ||
252 | /* sort segments */ | |
253 | for (i = 0; i < dev_info->num_of_segments; i++) | |
254 | for (j = 0; j < dev_info->num_of_segments; j++) | |
255 | if (sort_list[j].start > sort_list[i].start) { | |
256 | memcpy(&temp, &sort_list[i], | |
257 | sizeof(struct segment_info)); | |
258 | memcpy(&sort_list[i], &sort_list[j], | |
259 | sizeof(struct segment_info)); | |
260 | memcpy(&sort_list[j], &temp, | |
261 | sizeof(struct segment_info)); | |
262 | } | |
263 | ||
264 | /* check continuity */ | |
265 | for (i = 0; i < dev_info->num_of_segments - 1; i++) { | |
266 | if ((sort_list[i].end + 1) != sort_list[i+1].start) { | |
93098bf0 HY |
267 | pr_err("Adjacent DCSSs %s and %s are not " |
268 | "contiguous\n", sort_list[i].segment_name, | |
269 | sort_list[i+1].segment_name); | |
b2300b9e HY |
270 | rc = -EINVAL; |
271 | goto out; | |
272 | } | |
273 | /* EN and EW are allowed in a block device */ | |
274 | if (sort_list[i].segment_type != sort_list[i+1].segment_type) { | |
275 | if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || | |
276 | (sort_list[i].segment_type == SEG_TYPE_ER) || | |
277 | !(sort_list[i+1].segment_type & | |
278 | SEGMENT_EXCLUSIVE) || | |
279 | (sort_list[i+1].segment_type == SEG_TYPE_ER)) { | |
93098bf0 HY |
280 | pr_err("DCSS %s and DCSS %s have " |
281 | "incompatible types\n", | |
282 | sort_list[i].segment_name, | |
283 | sort_list[i+1].segment_name); | |
b2300b9e HY |
284 | rc = -EINVAL; |
285 | goto out; | |
286 | } | |
287 | } | |
288 | } | |
289 | rc = 0; | |
290 | out: | |
291 | kfree(sort_list); | |
292 | return rc; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Load a segment | |
297 | */ | |
298 | static int | |
299 | dcssblk_load_segment(char *name, struct segment_info **seg_info) | |
300 | { | |
301 | int rc; | |
302 | ||
303 | /* already loaded? */ | |
304 | down_read(&dcssblk_devices_sem); | |
305 | *seg_info = dcssblk_get_segment_by_name(name); | |
306 | up_read(&dcssblk_devices_sem); | |
307 | if (*seg_info != NULL) | |
308 | return -EEXIST; | |
309 | ||
310 | /* get a struct segment_info */ | |
311 | *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); | |
312 | if (*seg_info == NULL) | |
313 | return -ENOMEM; | |
314 | ||
315 | strcpy((*seg_info)->segment_name, name); | |
316 | ||
317 | /* load the segment */ | |
318 | rc = segment_load(name, SEGMENT_SHARED, | |
319 | &(*seg_info)->start, &(*seg_info)->end); | |
320 | if (rc < 0) { | |
321 | segment_warning(rc, (*seg_info)->segment_name); | |
322 | kfree(*seg_info); | |
323 | } else { | |
324 | INIT_LIST_HEAD(&(*seg_info)->lh); | |
325 | (*seg_info)->segment_type = rc; | |
326 | } | |
327 | return rc; | |
328 | } | |
329 | ||
1da177e4 LT |
330 | /* |
331 | * device attribute for switching shared/nonshared (exclusive) | |
332 | * operation (show + store) | |
333 | */ | |
334 | static ssize_t | |
e404e274 | 335 | dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
336 | { |
337 | struct dcssblk_dev_info *dev_info; | |
338 | ||
339 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
340 | return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); | |
341 | } | |
342 | ||
343 | static ssize_t | |
e404e274 | 344 | dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
345 | { |
346 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 347 | struct segment_info *entry, *temp; |
1da177e4 LT |
348 | int rc; |
349 | ||
ded77fb4 | 350 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 351 | return -EINVAL; |
1da177e4 LT |
352 | down_write(&dcssblk_devices_sem); |
353 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
354 | if (atomic_read(&dev_info->use_count)) { | |
1da177e4 LT |
355 | rc = -EBUSY; |
356 | goto out; | |
357 | } | |
358 | if (inbuf[0] == '1') { | |
b2300b9e HY |
359 | /* reload segments in shared mode */ |
360 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
361 | rc = segment_modify_shared(entry->segment_name, | |
362 | SEGMENT_SHARED); | |
363 | if (rc < 0) { | |
364 | BUG_ON(rc == -EINVAL); | |
365 | if (rc != -EAGAIN) | |
366 | goto removeseg; | |
1da177e4 LT |
367 | } |
368 | } | |
b2300b9e HY |
369 | dev_info->is_shared = 1; |
370 | switch (dev_info->segment_type) { | |
371 | case SEG_TYPE_SR: | |
372 | case SEG_TYPE_ER: | |
373 | case SEG_TYPE_SC: | |
374 | set_disk_ro(dev_info->gd, 1); | |
375 | } | |
1da177e4 | 376 | } else if (inbuf[0] == '0') { |
b2300b9e | 377 | /* reload segments in exclusive mode */ |
1da177e4 | 378 | if (dev_info->segment_type == SEG_TYPE_SC) { |
93098bf0 HY |
379 | pr_err("DCSS %s is of type SC and cannot be " |
380 | "loaded as exclusive-writable\n", | |
381 | dev_info->segment_name); | |
1da177e4 LT |
382 | rc = -EINVAL; |
383 | goto out; | |
384 | } | |
b2300b9e HY |
385 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
386 | rc = segment_modify_shared(entry->segment_name, | |
387 | SEGMENT_EXCLUSIVE); | |
388 | if (rc < 0) { | |
389 | BUG_ON(rc == -EINVAL); | |
390 | if (rc != -EAGAIN) | |
391 | goto removeseg; | |
392 | } | |
1da177e4 | 393 | } |
b2300b9e HY |
394 | dev_info->is_shared = 0; |
395 | set_disk_ro(dev_info->gd, 0); | |
1da177e4 | 396 | } else { |
1da177e4 LT |
397 | rc = -EINVAL; |
398 | goto out; | |
399 | } | |
400 | rc = count; | |
401 | goto out; | |
402 | ||
403 | removeseg: | |
93098bf0 HY |
404 | pr_err("DCSS device %s is removed after a failed access mode " |
405 | "change\n", dev_info->segment_name); | |
b2300b9e HY |
406 | temp = entry; |
407 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
408 | if (entry != temp) | |
409 | segment_unload(entry->segment_name); | |
410 | } | |
1da177e4 LT |
411 | list_del(&dev_info->lh); |
412 | ||
7a2765f6 DW |
413 | kill_dax(dev_info->dax_dev); |
414 | put_dax(dev_info->dax_dev); | |
1da177e4 | 415 | del_gendisk(dev_info->gd); |
1312f40e | 416 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
417 | dev_info->gd->queue = NULL; |
418 | put_disk(dev_info->gd); | |
0b60f9ea TH |
419 | up_write(&dcssblk_devices_sem); |
420 | ||
421 | if (device_remove_file_self(dev, attr)) { | |
422 | device_unregister(dev); | |
423 | put_device(dev); | |
424 | } | |
425 | return rc; | |
1da177e4 LT |
426 | out: |
427 | up_write(&dcssblk_devices_sem); | |
428 | return rc; | |
429 | } | |
521b3d79 SO |
430 | static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, |
431 | dcssblk_shared_store); | |
1da177e4 LT |
432 | |
433 | /* | |
434 | * device attribute for save operation on current copy | |
435 | * of the segment. If the segment is busy, saving will | |
436 | * become pending until it gets released, which can be | |
437 | * undone by storing a non-true value to this entry. | |
438 | * (show + store) | |
439 | */ | |
440 | static ssize_t | |
e404e274 | 441 | dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
442 | { |
443 | struct dcssblk_dev_info *dev_info; | |
444 | ||
445 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
446 | return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); | |
447 | } | |
448 | ||
449 | static ssize_t | |
e404e274 | 450 | dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
451 | { |
452 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 453 | struct segment_info *entry; |
1da177e4 | 454 | |
ded77fb4 | 455 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 456 | return -EINVAL; |
1da177e4 LT |
457 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
458 | ||
459 | down_write(&dcssblk_devices_sem); | |
460 | if (inbuf[0] == '1') { | |
461 | if (atomic_read(&dev_info->use_count) == 0) { | |
462 | // device is idle => we save immediately | |
93098bf0 HY |
463 | pr_info("All DCSSs that map to device %s are " |
464 | "saved\n", dev_info->segment_name); | |
b2300b9e | 465 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
466 | if (entry->segment_type == SEG_TYPE_EN || |
467 | entry->segment_type == SEG_TYPE_SN) | |
468 | pr_warn("DCSS %s is of type SN or EN" | |
469 | " and cannot be saved\n", | |
470 | entry->segment_name); | |
471 | else | |
472 | segment_save(entry->segment_name); | |
b2300b9e | 473 | } |
1da177e4 LT |
474 | } else { |
475 | // device is busy => we save it when it becomes | |
476 | // idle in dcssblk_release | |
93098bf0 HY |
477 | pr_info("Device %s is in use, its DCSSs will be " |
478 | "saved when it becomes idle\n", | |
479 | dev_info->segment_name); | |
1da177e4 LT |
480 | dev_info->save_pending = 1; |
481 | } | |
482 | } else if (inbuf[0] == '0') { | |
483 | if (dev_info->save_pending) { | |
484 | // device is busy & the user wants to undo his save | |
485 | // request | |
486 | dev_info->save_pending = 0; | |
93098bf0 HY |
487 | pr_info("A pending save request for device %s " |
488 | "has been canceled\n", | |
489 | dev_info->segment_name); | |
1da177e4 LT |
490 | } |
491 | } else { | |
492 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
493 | return -EINVAL; |
494 | } | |
495 | up_write(&dcssblk_devices_sem); | |
496 | return count; | |
497 | } | |
521b3d79 SO |
498 | static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, |
499 | dcssblk_save_store); | |
1da177e4 | 500 | |
b2300b9e HY |
501 | /* |
502 | * device attribute for showing all segments in a device | |
503 | */ | |
504 | static ssize_t | |
505 | dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, | |
506 | char *buf) | |
507 | { | |
508 | int i; | |
509 | ||
510 | struct dcssblk_dev_info *dev_info; | |
511 | struct segment_info *entry; | |
512 | ||
513 | down_read(&dcssblk_devices_sem); | |
514 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
515 | i = 0; | |
516 | buf[0] = '\0'; | |
517 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
518 | strcpy(&buf[i], entry->segment_name); | |
519 | i += strlen(entry->segment_name); | |
520 | buf[i] = '\n'; | |
521 | i++; | |
522 | } | |
523 | up_read(&dcssblk_devices_sem); | |
524 | return i; | |
525 | } | |
521b3d79 SO |
526 | static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); |
527 | ||
528 | static struct attribute *dcssblk_dev_attrs[] = { | |
529 | &dev_attr_shared.attr, | |
530 | &dev_attr_save.attr, | |
531 | &dev_attr_seglist.attr, | |
532 | NULL, | |
533 | }; | |
534 | static struct attribute_group dcssblk_dev_attr_group = { | |
535 | .attrs = dcssblk_dev_attrs, | |
536 | }; | |
537 | static const struct attribute_group *dcssblk_dev_attr_groups[] = { | |
538 | &dcssblk_dev_attr_group, | |
539 | NULL, | |
540 | }; | |
b2300b9e | 541 | |
1da177e4 LT |
542 | /* |
543 | * device attribute for adding devices | |
544 | */ | |
545 | static ssize_t | |
e404e274 | 546 | dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 547 | { |
b2300b9e | 548 | int rc, i, j, num_of_segments; |
1da177e4 | 549 | struct dcssblk_dev_info *dev_info; |
b2300b9e | 550 | struct segment_info *seg_info, *temp; |
1da177e4 LT |
551 | char *local_buf; |
552 | unsigned long seg_byte_size; | |
553 | ||
554 | dev_info = NULL; | |
b2300b9e | 555 | seg_info = NULL; |
1da177e4 LT |
556 | if (dev != dcssblk_root_dev) { |
557 | rc = -EINVAL; | |
558 | goto out_nobuf; | |
559 | } | |
b2300b9e HY |
560 | if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { |
561 | rc = -ENAMETOOLONG; | |
562 | goto out_nobuf; | |
563 | } | |
564 | ||
1da177e4 LT |
565 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
566 | if (local_buf == NULL) { | |
567 | rc = -ENOMEM; | |
568 | goto out_nobuf; | |
569 | } | |
b2300b9e | 570 | |
1da177e4 LT |
571 | /* |
572 | * parse input | |
573 | */ | |
b2300b9e | 574 | num_of_segments = 0; |
3a9f9183 | 575 | for (i = 0; (i < count && (buf[i] != '\0') && (buf[i] != '\n')); i++) { |
42cfc6b5 MS |
576 | for (j = i; j < count && |
577 | (buf[j] != ':') && | |
b2300b9e | 578 | (buf[j] != '\0') && |
42cfc6b5 | 579 | (buf[j] != '\n'); j++) { |
b2300b9e HY |
580 | local_buf[j-i] = toupper(buf[j]); |
581 | } | |
582 | local_buf[j-i] = '\0'; | |
583 | if (((j - i) == 0) || ((j - i) > 8)) { | |
584 | rc = -ENAMETOOLONG; | |
585 | goto seg_list_del; | |
586 | } | |
587 | ||
588 | rc = dcssblk_load_segment(local_buf, &seg_info); | |
589 | if (rc < 0) | |
590 | goto seg_list_del; | |
591 | /* | |
592 | * get a struct dcssblk_dev_info | |
593 | */ | |
594 | if (num_of_segments == 0) { | |
595 | dev_info = kzalloc(sizeof(struct dcssblk_dev_info), | |
596 | GFP_KERNEL); | |
597 | if (dev_info == NULL) { | |
598 | rc = -ENOMEM; | |
599 | goto out; | |
600 | } | |
601 | strcpy(dev_info->segment_name, local_buf); | |
602 | dev_info->segment_type = seg_info->segment_type; | |
603 | INIT_LIST_HEAD(&dev_info->seg_list); | |
604 | } | |
605 | list_add_tail(&seg_info->lh, &dev_info->seg_list); | |
606 | num_of_segments++; | |
607 | i = j; | |
608 | ||
609 | if ((buf[j] == '\0') || (buf[j] == '\n')) | |
610 | break; | |
1da177e4 | 611 | } |
b2300b9e HY |
612 | |
613 | /* no trailing colon at the end of the input */ | |
614 | if ((i > 0) && (buf[i-1] == ':')) { | |
1da177e4 | 615 | rc = -ENAMETOOLONG; |
b2300b9e | 616 | goto seg_list_del; |
1da177e4 | 617 | } |
b2300b9e HY |
618 | strlcpy(local_buf, buf, i + 1); |
619 | dev_info->num_of_segments = num_of_segments; | |
620 | rc = dcssblk_is_continuous(dev_info); | |
621 | if (rc < 0) | |
622 | goto seg_list_del; | |
623 | ||
624 | dev_info->start = dcssblk_find_lowest_addr(dev_info); | |
625 | dev_info->end = dcssblk_find_highest_addr(dev_info); | |
1da177e4 | 626 | |
ef283688 | 627 | dev_set_name(&dev_info->dev, "%s", dev_info->segment_name); |
1da177e4 | 628 | dev_info->dev.release = dcssblk_release_segment; |
521b3d79 | 629 | dev_info->dev.groups = dcssblk_dev_attr_groups; |
1da177e4 | 630 | INIT_LIST_HEAD(&dev_info->lh); |
1da177e4 LT |
631 | dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); |
632 | if (dev_info->gd == NULL) { | |
633 | rc = -ENOMEM; | |
b2300b9e | 634 | goto seg_list_del; |
1da177e4 LT |
635 | } |
636 | dev_info->gd->major = dcssblk_major; | |
637 | dev_info->gd->fops = &dcssblk_devops; | |
638 | dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); | |
639 | dev_info->gd->queue = dev_info->dcssblk_queue; | |
640 | dev_info->gd->private_data = dev_info; | |
c5411dba | 641 | blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); |
e1defc4f | 642 | blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); |
8b904b5b | 643 | blk_queue_flag_set(QUEUE_FLAG_DAX, dev_info->dcssblk_queue); |
b2300b9e | 644 | |
1da177e4 LT |
645 | seg_byte_size = (dev_info->end - dev_info->start + 1); |
646 | set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors | |
93098bf0 HY |
647 | pr_info("Loaded %s with total size %lu bytes and capacity %lu " |
648 | "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); | |
1da177e4 | 649 | |
1da177e4 LT |
650 | dev_info->save_pending = 0; |
651 | dev_info->is_shared = 1; | |
652 | dev_info->dev.parent = dcssblk_root_dev; | |
653 | ||
654 | /* | |
b2300b9e | 655 | *get minor, add to list |
1da177e4 LT |
656 | */ |
657 | down_write(&dcssblk_devices_sem); | |
b2300b9e | 658 | if (dcssblk_get_segment_by_name(local_buf)) { |
04f64b57 | 659 | rc = -EEXIST; |
b2300b9e | 660 | goto release_gd; |
04f64b57 | 661 | } |
1da177e4 | 662 | rc = dcssblk_assign_free_minor(dev_info); |
b2300b9e HY |
663 | if (rc) |
664 | goto release_gd; | |
1da177e4 | 665 | sprintf(dev_info->gd->disk_name, "dcssblk%d", |
d0591485 | 666 | dev_info->gd->first_minor); |
1da177e4 LT |
667 | list_add_tail(&dev_info->lh, &dcssblk_devices); |
668 | ||
669 | if (!try_module_get(THIS_MODULE)) { | |
670 | rc = -ENODEV; | |
b2300b9e | 671 | goto dev_list_del; |
1da177e4 LT |
672 | } |
673 | /* | |
674 | * register the device | |
675 | */ | |
676 | rc = device_register(&dev_info->dev); | |
b2300b9e | 677 | if (rc) |
521b3d79 | 678 | goto put_dev; |
1da177e4 | 679 | |
7a2765f6 DW |
680 | dev_info->dax_dev = alloc_dax(dev_info, dev_info->gd->disk_name, |
681 | &dcssblk_dax_ops); | |
682 | if (!dev_info->dax_dev) { | |
683 | rc = -ENOMEM; | |
684 | goto put_dev; | |
685 | } | |
686 | ||
521b3d79 | 687 | get_device(&dev_info->dev); |
0d52c756 | 688 | device_add_disk(&dev_info->dev, dev_info->gd); |
436d1bc7 | 689 | |
1da177e4 LT |
690 | switch (dev_info->segment_type) { |
691 | case SEG_TYPE_SR: | |
692 | case SEG_TYPE_ER: | |
693 | case SEG_TYPE_SC: | |
694 | set_disk_ro(dev_info->gd,1); | |
695 | break; | |
696 | default: | |
697 | set_disk_ro(dev_info->gd,0); | |
698 | break; | |
699 | } | |
1da177e4 LT |
700 | up_write(&dcssblk_devices_sem); |
701 | rc = count; | |
702 | goto out; | |
703 | ||
521b3d79 | 704 | put_dev: |
1da177e4 | 705 | list_del(&dev_info->lh); |
1312f40e | 706 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
707 | dev_info->gd->queue = NULL; |
708 | put_disk(dev_info->gd); | |
b2300b9e HY |
709 | list_for_each_entry(seg_info, &dev_info->seg_list, lh) { |
710 | segment_unload(seg_info->segment_name); | |
711 | } | |
1da177e4 LT |
712 | put_device(&dev_info->dev); |
713 | up_write(&dcssblk_devices_sem); | |
714 | goto out; | |
b2300b9e | 715 | dev_list_del: |
1da177e4 | 716 | list_del(&dev_info->lh); |
b2300b9e | 717 | release_gd: |
1312f40e | 718 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
719 | dev_info->gd->queue = NULL; |
720 | put_disk(dev_info->gd); | |
b2300b9e HY |
721 | up_write(&dcssblk_devices_sem); |
722 | seg_list_del: | |
723 | if (dev_info == NULL) | |
724 | goto out; | |
725 | list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) { | |
726 | list_del(&seg_info->lh); | |
727 | segment_unload(seg_info->segment_name); | |
728 | kfree(seg_info); | |
729 | } | |
1da177e4 LT |
730 | kfree(dev_info); |
731 | out: | |
732 | kfree(local_buf); | |
733 | out_nobuf: | |
734 | return rc; | |
735 | } | |
736 | ||
737 | /* | |
738 | * device attribute for removing devices | |
739 | */ | |
740 | static ssize_t | |
e404e274 | 741 | dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
742 | { |
743 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 744 | struct segment_info *entry; |
1da177e4 LT |
745 | int rc, i; |
746 | char *local_buf; | |
747 | ||
748 | if (dev != dcssblk_root_dev) { | |
749 | return -EINVAL; | |
750 | } | |
751 | local_buf = kmalloc(count + 1, GFP_KERNEL); | |
752 | if (local_buf == NULL) { | |
753 | return -ENOMEM; | |
754 | } | |
755 | /* | |
756 | * parse input | |
757 | */ | |
42cfc6b5 | 758 | for (i = 0; (i < count && (*(buf+i)!='\0') && (*(buf+i)!='\n')); i++) { |
1da177e4 LT |
759 | local_buf[i] = toupper(buf[i]); |
760 | } | |
761 | local_buf[i] = '\0'; | |
762 | if ((i == 0) || (i > 8)) { | |
763 | rc = -ENAMETOOLONG; | |
764 | goto out_buf; | |
765 | } | |
766 | ||
767 | down_write(&dcssblk_devices_sem); | |
768 | dev_info = dcssblk_get_device_by_name(local_buf); | |
769 | if (dev_info == NULL) { | |
770 | up_write(&dcssblk_devices_sem); | |
baebc70a JP |
771 | pr_warn("Device %s cannot be removed because it is not a known device\n", |
772 | local_buf); | |
1da177e4 LT |
773 | rc = -ENODEV; |
774 | goto out_buf; | |
775 | } | |
776 | if (atomic_read(&dev_info->use_count) != 0) { | |
777 | up_write(&dcssblk_devices_sem); | |
baebc70a JP |
778 | pr_warn("Device %s cannot be removed while it is in use\n", |
779 | local_buf); | |
1da177e4 LT |
780 | rc = -EBUSY; |
781 | goto out_buf; | |
782 | } | |
1da177e4 | 783 | |
b2300b9e | 784 | list_del(&dev_info->lh); |
7a2765f6 DW |
785 | kill_dax(dev_info->dax_dev); |
786 | put_dax(dev_info->dax_dev); | |
1da177e4 | 787 | del_gendisk(dev_info->gd); |
1312f40e | 788 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
789 | dev_info->gd->queue = NULL; |
790 | put_disk(dev_info->gd); | |
b2300b9e HY |
791 | |
792 | /* unload all related segments */ | |
793 | list_for_each_entry(entry, &dev_info->seg_list, lh) | |
794 | segment_unload(entry->segment_name); | |
795 | ||
1da177e4 LT |
796 | up_write(&dcssblk_devices_sem); |
797 | ||
1378a683 GS |
798 | device_unregister(&dev_info->dev); |
799 | put_device(&dev_info->dev); | |
800 | ||
1da177e4 LT |
801 | rc = count; |
802 | out_buf: | |
803 | kfree(local_buf); | |
804 | return rc; | |
805 | } | |
806 | ||
807 | static int | |
46d74326 | 808 | dcssblk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
809 | { |
810 | struct dcssblk_dev_info *dev_info; | |
811 | int rc; | |
812 | ||
46d74326 | 813 | dev_info = bdev->bd_disk->private_data; |
1da177e4 LT |
814 | if (NULL == dev_info) { |
815 | rc = -ENODEV; | |
816 | goto out; | |
817 | } | |
818 | atomic_inc(&dev_info->use_count); | |
46d74326 | 819 | bdev->bd_block_size = 4096; |
1da177e4 LT |
820 | rc = 0; |
821 | out: | |
822 | return rc; | |
823 | } | |
824 | ||
db2a144b | 825 | static void |
46d74326 | 826 | dcssblk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 827 | { |
46d74326 | 828 | struct dcssblk_dev_info *dev_info = disk->private_data; |
b2300b9e | 829 | struct segment_info *entry; |
1da177e4 | 830 | |
46d74326 | 831 | if (!dev_info) { |
db2a144b AV |
832 | WARN_ON(1); |
833 | return; | |
1da177e4 LT |
834 | } |
835 | down_write(&dcssblk_devices_sem); | |
836 | if (atomic_dec_and_test(&dev_info->use_count) | |
837 | && (dev_info->save_pending)) { | |
93098bf0 HY |
838 | pr_info("Device %s has become idle and is being saved " |
839 | "now\n", dev_info->segment_name); | |
b2300b9e | 840 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
841 | if (entry->segment_type == SEG_TYPE_EN || |
842 | entry->segment_type == SEG_TYPE_SN) | |
843 | pr_warn("DCSS %s is of type SN or EN and cannot" | |
844 | " be saved\n", entry->segment_name); | |
845 | else | |
846 | segment_save(entry->segment_name); | |
b2300b9e | 847 | } |
1da177e4 LT |
848 | dev_info->save_pending = 0; |
849 | } | |
850 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
851 | } |
852 | ||
dece1635 | 853 | static blk_qc_t |
165125e1 | 854 | dcssblk_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
855 | { |
856 | struct dcssblk_dev_info *dev_info; | |
7988613b KO |
857 | struct bio_vec bvec; |
858 | struct bvec_iter iter; | |
1da177e4 LT |
859 | unsigned long index; |
860 | unsigned long page_addr; | |
861 | unsigned long source_addr; | |
862 | unsigned long bytes_done; | |
1da177e4 | 863 | |
af67c31f | 864 | blk_queue_split(q, &bio); |
54efd50b | 865 | |
1da177e4 | 866 | bytes_done = 0; |
74d46992 | 867 | dev_info = bio->bi_disk->private_data; |
1da177e4 LT |
868 | if (dev_info == NULL) |
869 | goto fail; | |
4f024f37 KO |
870 | if ((bio->bi_iter.bi_sector & 7) != 0 || |
871 | (bio->bi_iter.bi_size & 4095) != 0) | |
1da177e4 LT |
872 | /* Request is not page-aligned. */ |
873 | goto fail; | |
74d46992 | 874 | if (bio_end_sector(bio) > get_capacity(bio->bi_disk)) { |
1da177e4 LT |
875 | /* Request beyond end of DCSS segment. */ |
876 | goto fail; | |
877 | } | |
420edbcc CO |
878 | /* verify data transfer direction */ |
879 | if (dev_info->is_shared) { | |
880 | switch (dev_info->segment_type) { | |
881 | case SEG_TYPE_SR: | |
882 | case SEG_TYPE_ER: | |
883 | case SEG_TYPE_SC: | |
884 | /* cannot write to these segments */ | |
885 | if (bio_data_dir(bio) == WRITE) { | |
baebc70a JP |
886 | pr_warn("Writing to %s failed because it is a read-only device\n", |
887 | dev_name(&dev_info->dev)); | |
420edbcc CO |
888 | goto fail; |
889 | } | |
890 | } | |
891 | } | |
892 | ||
4f024f37 | 893 | index = (bio->bi_iter.bi_sector >> 3); |
7988613b | 894 | bio_for_each_segment(bvec, bio, iter) { |
1da177e4 | 895 | page_addr = (unsigned long) |
7988613b | 896 | page_address(bvec.bv_page) + bvec.bv_offset; |
1da177e4 | 897 | source_addr = dev_info->start + (index<<12) + bytes_done; |
7988613b | 898 | if (unlikely((page_addr & 4095) != 0) || (bvec.bv_len & 4095) != 0) |
1da177e4 LT |
899 | // More paranoia. |
900 | goto fail; | |
901 | if (bio_data_dir(bio) == READ) { | |
902 | memcpy((void*)page_addr, (void*)source_addr, | |
7988613b | 903 | bvec.bv_len); |
1da177e4 LT |
904 | } else { |
905 | memcpy((void*)source_addr, (void*)page_addr, | |
7988613b | 906 | bvec.bv_len); |
1da177e4 | 907 | } |
7988613b | 908 | bytes_done += bvec.bv_len; |
1da177e4 | 909 | } |
4246a0b6 | 910 | bio_endio(bio); |
dece1635 | 911 | return BLK_QC_T_NONE; |
1da177e4 | 912 | fail: |
6712ecf8 | 913 | bio_io_error(bio); |
dece1635 | 914 | return BLK_QC_T_NONE; |
420edbcc CO |
915 | } |
916 | ||
dd22f551 | 917 | static long |
7a2765f6 DW |
918 | __dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff, |
919 | long nr_pages, void **kaddr, pfn_t *pfn) | |
920 | { | |
921 | resource_size_t offset = pgoff * PAGE_SIZE; | |
922 | unsigned long dev_sz; | |
923 | ||
924 | dev_sz = dev_info->end - dev_info->start + 1; | |
925 | *kaddr = (void *) dev_info->start + offset; | |
785a3fab DW |
926 | *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), |
927 | PFN_DEV|PFN_SPECIAL); | |
7a2765f6 DW |
928 | |
929 | return (dev_sz - offset) / PAGE_SIZE; | |
930 | } | |
931 | ||
7a2765f6 DW |
932 | static long |
933 | dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, | |
934 | long nr_pages, void **kaddr, pfn_t *pfn) | |
935 | { | |
936 | struct dcssblk_dev_info *dev_info = dax_get_private(dax_dev); | |
30afcb4b | 937 | |
7a2765f6 | 938 | return __dcssblk_direct_access(dev_info, pgoff, nr_pages, kaddr, pfn); |
1da177e4 LT |
939 | } |
940 | ||
941 | static void | |
942 | dcssblk_check_params(void) | |
943 | { | |
944 | int rc, i, j, k; | |
b2300b9e | 945 | char buf[DCSSBLK_PARM_LEN + 1]; |
1da177e4 LT |
946 | struct dcssblk_dev_info *dev_info; |
947 | ||
948 | for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); | |
949 | i++) { | |
42cfc6b5 MS |
950 | for (j = i; (j < DCSSBLK_PARM_LEN) && |
951 | (dcssblk_segments[j] != ',') && | |
1da177e4 | 952 | (dcssblk_segments[j] != '\0') && |
42cfc6b5 | 953 | (dcssblk_segments[j] != '('); j++) |
1da177e4 LT |
954 | { |
955 | buf[j-i] = dcssblk_segments[j]; | |
956 | } | |
957 | buf[j-i] = '\0'; | |
f901e5d1 | 958 | rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); |
1da177e4 | 959 | if ((rc >= 0) && (dcssblk_segments[j] == '(')) { |
b2300b9e | 960 | for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) |
1da177e4 | 961 | buf[k] = toupper(buf[k]); |
b2300b9e | 962 | buf[k] = '\0'; |
1da177e4 LT |
963 | if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { |
964 | down_read(&dcssblk_devices_sem); | |
965 | dev_info = dcssblk_get_device_by_name(buf); | |
966 | up_read(&dcssblk_devices_sem); | |
967 | if (dev_info) | |
968 | dcssblk_shared_store(&dev_info->dev, | |
f901e5d1 | 969 | NULL, "0\n", 2); |
1da177e4 LT |
970 | } |
971 | } | |
972 | while ((dcssblk_segments[j] != ',') && | |
973 | (dcssblk_segments[j] != '\0')) | |
974 | { | |
975 | j++; | |
976 | } | |
977 | if (dcssblk_segments[j] == '\0') | |
978 | break; | |
979 | i = j; | |
980 | } | |
981 | } | |
982 | ||
c369527f GS |
983 | /* |
984 | * Suspend / Resume | |
985 | */ | |
986 | static int dcssblk_freeze(struct device *dev) | |
987 | { | |
988 | struct dcssblk_dev_info *dev_info; | |
989 | int rc = 0; | |
990 | ||
991 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
992 | switch (dev_info->segment_type) { | |
993 | case SEG_TYPE_SR: | |
994 | case SEG_TYPE_ER: | |
995 | case SEG_TYPE_SC: | |
996 | if (!dev_info->is_shared) | |
997 | rc = -EINVAL; | |
998 | break; | |
999 | default: | |
1000 | rc = -EINVAL; | |
1001 | break; | |
1002 | } | |
1003 | if (rc) | |
1004 | break; | |
1005 | } | |
1006 | if (rc) | |
2c48c4d6 CB |
1007 | pr_err("Suspending the system failed because DCSS device %s " |
1008 | "is writable\n", | |
c369527f GS |
1009 | dev_info->segment_name); |
1010 | return rc; | |
1011 | } | |
1012 | ||
1013 | static int dcssblk_restore(struct device *dev) | |
1014 | { | |
1015 | struct dcssblk_dev_info *dev_info; | |
1016 | struct segment_info *entry; | |
1017 | unsigned long start, end; | |
1018 | int rc = 0; | |
1019 | ||
1020 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
1021 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
1022 | segment_unload(entry->segment_name); | |
1023 | rc = segment_load(entry->segment_name, SEGMENT_SHARED, | |
1024 | &start, &end); | |
1025 | if (rc < 0) { | |
1026 | // TODO in_use check ? | |
1027 | segment_warning(rc, entry->segment_name); | |
1028 | goto out_panic; | |
1029 | } | |
1030 | if (start != entry->start || end != entry->end) { | |
2c48c4d6 CB |
1031 | pr_err("The address range of DCSS %s changed " |
1032 | "while the system was suspended\n", | |
c369527f GS |
1033 | entry->segment_name); |
1034 | goto out_panic; | |
1035 | } | |
1036 | } | |
1037 | } | |
1038 | return 0; | |
1039 | out_panic: | |
1040 | panic("fatal dcssblk resume error\n"); | |
1041 | } | |
1042 | ||
1043 | static int dcssblk_thaw(struct device *dev) | |
1044 | { | |
1045 | return 0; | |
1046 | } | |
1047 | ||
47145210 | 1048 | static const struct dev_pm_ops dcssblk_pm_ops = { |
c369527f GS |
1049 | .freeze = dcssblk_freeze, |
1050 | .thaw = dcssblk_thaw, | |
1051 | .restore = dcssblk_restore, | |
1052 | }; | |
1053 | ||
1054 | static struct platform_driver dcssblk_pdrv = { | |
1055 | .driver = { | |
1056 | .name = "dcssblk", | |
c369527f GS |
1057 | .pm = &dcssblk_pm_ops, |
1058 | }, | |
1059 | }; | |
1060 | ||
1061 | static struct platform_device *dcssblk_pdev; | |
1062 | ||
1063 | ||
1da177e4 LT |
1064 | /* |
1065 | * The init/exit functions. | |
1066 | */ | |
1067 | static void __exit | |
1068 | dcssblk_exit(void) | |
1069 | { | |
c369527f GS |
1070 | platform_device_unregister(dcssblk_pdev); |
1071 | platform_driver_unregister(&dcssblk_pdrv); | |
035da16f | 1072 | root_device_unregister(dcssblk_root_dev); |
00d59405 | 1073 | unregister_blkdev(dcssblk_major, DCSSBLK_NAME); |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | static int __init | |
1077 | dcssblk_init(void) | |
1078 | { | |
1079 | int rc; | |
1080 | ||
c369527f GS |
1081 | rc = platform_driver_register(&dcssblk_pdrv); |
1082 | if (rc) | |
1da177e4 | 1083 | return rc; |
c369527f GS |
1084 | |
1085 | dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL, | |
1086 | 0); | |
1087 | if (IS_ERR(dcssblk_pdev)) { | |
1088 | rc = PTR_ERR(dcssblk_pdev); | |
1089 | goto out_pdrv; | |
1da177e4 | 1090 | } |
c369527f GS |
1091 | |
1092 | dcssblk_root_dev = root_device_register("dcssblk"); | |
1093 | if (IS_ERR(dcssblk_root_dev)) { | |
1094 | rc = PTR_ERR(dcssblk_root_dev); | |
1095 | goto out_pdev; | |
1da177e4 | 1096 | } |
c369527f GS |
1097 | rc = device_create_file(dcssblk_root_dev, &dev_attr_add); |
1098 | if (rc) | |
1099 | goto out_root; | |
1100 | rc = device_create_file(dcssblk_root_dev, &dev_attr_remove); | |
1101 | if (rc) | |
1102 | goto out_root; | |
1da177e4 | 1103 | rc = register_blkdev(0, DCSSBLK_NAME); |
c369527f GS |
1104 | if (rc < 0) |
1105 | goto out_root; | |
1da177e4 LT |
1106 | dcssblk_major = rc; |
1107 | init_rwsem(&dcssblk_devices_sem); | |
1108 | ||
1109 | dcssblk_check_params(); | |
1da177e4 | 1110 | return 0; |
c369527f GS |
1111 | |
1112 | out_root: | |
1113 | root_device_unregister(dcssblk_root_dev); | |
1114 | out_pdev: | |
1115 | platform_device_unregister(dcssblk_pdev); | |
1116 | out_pdrv: | |
1117 | platform_driver_unregister(&dcssblk_pdrv); | |
1118 | return rc; | |
1da177e4 LT |
1119 | } |
1120 | ||
1121 | module_init(dcssblk_init); | |
1122 | module_exit(dcssblk_exit); | |
1123 | ||
1124 | module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); | |
1125 | MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " | |
b2300b9e HY |
1126 | "comma-separated list, names in each set separated " |
1127 | "by commas are separated by colons, each set contains " | |
1128 | "names of contiguous segments and each name max. 8 chars.\n" | |
1129 | "Adding \"(local)\" to the end of each set equals echoing 0 " | |
1130 | "to /sys/devices/dcssblk/<device name>/shared after loading " | |
1131 | "the contiguous segments - \n" | |
1132 | "e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\""); | |
1da177e4 LT |
1133 | |
1134 | MODULE_LICENSE("GPL"); |