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> |
5d61e43b | 21 | #include <linux/uio.h> |
7a2765f6 | 22 | #include <linux/dax.h> |
c369527f GS |
23 | #include <asm/extmem.h> |
24 | #include <asm/io.h> | |
1da177e4 | 25 | |
1da177e4 LT |
26 | #define DCSSBLK_NAME "dcssblk" |
27 | #define DCSSBLK_MINORS_PER_DISK 1 | |
28 | #define DCSSBLK_PARM_LEN 400 | |
98df67b3 | 29 | #define DCSS_BUS_ID_SIZE 20 |
1da177e4 | 30 | |
46d74326 | 31 | static int dcssblk_open(struct block_device *bdev, fmode_t mode); |
db2a144b | 32 | static void dcssblk_release(struct gendisk *disk, fmode_t mode); |
dece1635 JA |
33 | static blk_qc_t dcssblk_make_request(struct request_queue *q, |
34 | struct bio *bio); | |
7a2765f6 DW |
35 | static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, |
36 | long nr_pages, void **kaddr, pfn_t *pfn); | |
1da177e4 LT |
37 | |
38 | static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; | |
39 | ||
40 | static int dcssblk_major; | |
83d5cde4 | 41 | static const struct block_device_operations dcssblk_devops = { |
420edbcc | 42 | .owner = THIS_MODULE, |
46d74326 AV |
43 | .open = dcssblk_open, |
44 | .release = dcssblk_release, | |
7a2765f6 DW |
45 | }; |
46 | ||
5d61e43b DW |
47 | static size_t dcssblk_dax_copy_from_iter(struct dax_device *dax_dev, |
48 | pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) | |
49 | { | |
50 | return copy_from_iter(addr, bytes, i); | |
51 | } | |
52 | ||
7a2765f6 DW |
53 | static const struct dax_operations dcssblk_dax_ops = { |
54 | .direct_access = dcssblk_dax_direct_access, | |
5d61e43b | 55 | .copy_from_iter = dcssblk_dax_copy_from_iter, |
1da177e4 LT |
56 | }; |
57 | ||
b2300b9e HY |
58 | struct dcssblk_dev_info { |
59 | struct list_head lh; | |
60 | struct device dev; | |
98df67b3 | 61 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
62 | atomic_t use_count; |
63 | struct gendisk *gd; | |
64 | unsigned long start; | |
65 | unsigned long end; | |
66 | int segment_type; | |
67 | unsigned char save_pending; | |
68 | unsigned char is_shared; | |
69 | struct request_queue *dcssblk_queue; | |
70 | int num_of_segments; | |
71 | struct list_head seg_list; | |
7a2765f6 | 72 | struct dax_device *dax_dev; |
b2300b9e HY |
73 | }; |
74 | ||
75 | struct segment_info { | |
76 | struct list_head lh; | |
98df67b3 | 77 | char segment_name[DCSS_BUS_ID_SIZE]; |
b2300b9e HY |
78 | unsigned long start; |
79 | unsigned long end; | |
80 | int segment_type; | |
81 | }; | |
82 | ||
e404e274 | 83 | static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 84 | size_t count); |
e404e274 | 85 | static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, |
1da177e4 | 86 | size_t count); |
1da177e4 LT |
87 | |
88 | static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); | |
89 | static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); | |
1da177e4 LT |
90 | |
91 | static struct device *dcssblk_root_dev; | |
92 | ||
c11ca97e | 93 | static LIST_HEAD(dcssblk_devices); |
1da177e4 LT |
94 | static struct rw_semaphore dcssblk_devices_sem; |
95 | ||
96 | /* | |
97 | * release function for segment device. | |
98 | */ | |
99 | static void | |
100 | dcssblk_release_segment(struct device *dev) | |
101 | { | |
b2300b9e HY |
102 | struct dcssblk_dev_info *dev_info; |
103 | struct segment_info *entry, *temp; | |
104 | ||
105 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
106 | list_for_each_entry_safe(entry, temp, &dev_info->seg_list, lh) { | |
107 | list_del(&entry->lh); | |
108 | kfree(entry); | |
109 | } | |
110 | kfree(dev_info); | |
1da177e4 LT |
111 | module_put(THIS_MODULE); |
112 | } | |
113 | ||
114 | /* | |
115 | * get a minor number. needs to be called with | |
116 | * down_write(&dcssblk_devices_sem) and the | |
117 | * device needs to be enqueued before the semaphore is | |
118 | * freed. | |
119 | */ | |
4d284cac | 120 | static int |
1da177e4 LT |
121 | dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info) |
122 | { | |
123 | int minor, found; | |
124 | struct dcssblk_dev_info *entry; | |
125 | ||
126 | if (dev_info == NULL) | |
127 | return -EINVAL; | |
128 | for (minor = 0; minor < (1<<MINORBITS); minor++) { | |
129 | found = 0; | |
130 | // test if minor available | |
131 | list_for_each_entry(entry, &dcssblk_devices, lh) | |
d0591485 | 132 | if (minor == entry->gd->first_minor) |
1da177e4 LT |
133 | found++; |
134 | if (!found) break; // got unused minor | |
135 | } | |
136 | if (found) | |
137 | return -EBUSY; | |
138 | dev_info->gd->first_minor = minor; | |
139 | return 0; | |
140 | } | |
141 | ||
142 | /* | |
143 | * get the struct dcssblk_dev_info from dcssblk_devices | |
144 | * for the given name. | |
145 | * down_read(&dcssblk_devices_sem) must be held. | |
146 | */ | |
147 | static struct dcssblk_dev_info * | |
148 | dcssblk_get_device_by_name(char *name) | |
149 | { | |
150 | struct dcssblk_dev_info *entry; | |
151 | ||
152 | list_for_each_entry(entry, &dcssblk_devices, lh) { | |
153 | if (!strcmp(name, entry->segment_name)) { | |
154 | return entry; | |
155 | } | |
156 | } | |
157 | return NULL; | |
158 | } | |
159 | ||
b2300b9e HY |
160 | /* |
161 | * get the struct segment_info from seg_list | |
162 | * for the given name. | |
163 | * down_read(&dcssblk_devices_sem) must be held. | |
164 | */ | |
165 | static struct segment_info * | |
166 | dcssblk_get_segment_by_name(char *name) | |
167 | { | |
168 | struct dcssblk_dev_info *dev_info; | |
169 | struct segment_info *entry; | |
170 | ||
171 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
172 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
173 | if (!strcmp(name, entry->segment_name)) | |
174 | return entry; | |
175 | } | |
176 | } | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | /* | |
181 | * get the highest address of the multi-segment block. | |
182 | */ | |
183 | static unsigned long | |
184 | dcssblk_find_highest_addr(struct dcssblk_dev_info *dev_info) | |
185 | { | |
186 | unsigned long highest_addr; | |
187 | struct segment_info *entry; | |
188 | ||
189 | highest_addr = 0; | |
190 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
191 | if (highest_addr < entry->end) | |
192 | highest_addr = entry->end; | |
193 | } | |
194 | return highest_addr; | |
195 | } | |
196 | ||
197 | /* | |
198 | * get the lowest address of the multi-segment block. | |
199 | */ | |
200 | static unsigned long | |
201 | dcssblk_find_lowest_addr(struct dcssblk_dev_info *dev_info) | |
202 | { | |
203 | int set_first; | |
204 | unsigned long lowest_addr; | |
205 | struct segment_info *entry; | |
206 | ||
207 | set_first = 0; | |
208 | lowest_addr = 0; | |
209 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
210 | if (set_first == 0) { | |
211 | lowest_addr = entry->start; | |
212 | set_first = 1; | |
213 | } else { | |
214 | if (lowest_addr > entry->start) | |
215 | lowest_addr = entry->start; | |
216 | } | |
217 | } | |
218 | return lowest_addr; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Check continuity of segments. | |
223 | */ | |
224 | static int | |
225 | dcssblk_is_continuous(struct dcssblk_dev_info *dev_info) | |
226 | { | |
227 | int i, j, rc; | |
228 | struct segment_info *sort_list, *entry, temp; | |
229 | ||
230 | if (dev_info->num_of_segments <= 1) | |
231 | return 0; | |
232 | ||
233 | sort_list = kzalloc( | |
234 | sizeof(struct segment_info) * dev_info->num_of_segments, | |
235 | GFP_KERNEL); | |
236 | if (sort_list == NULL) | |
237 | return -ENOMEM; | |
238 | i = 0; | |
239 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
240 | memcpy(&sort_list[i], entry, sizeof(struct segment_info)); | |
241 | i++; | |
242 | } | |
243 | ||
244 | /* sort segments */ | |
245 | for (i = 0; i < dev_info->num_of_segments; i++) | |
246 | for (j = 0; j < dev_info->num_of_segments; j++) | |
247 | if (sort_list[j].start > sort_list[i].start) { | |
248 | memcpy(&temp, &sort_list[i], | |
249 | sizeof(struct segment_info)); | |
250 | memcpy(&sort_list[i], &sort_list[j], | |
251 | sizeof(struct segment_info)); | |
252 | memcpy(&sort_list[j], &temp, | |
253 | sizeof(struct segment_info)); | |
254 | } | |
255 | ||
256 | /* check continuity */ | |
257 | for (i = 0; i < dev_info->num_of_segments - 1; i++) { | |
258 | if ((sort_list[i].end + 1) != sort_list[i+1].start) { | |
93098bf0 HY |
259 | pr_err("Adjacent DCSSs %s and %s are not " |
260 | "contiguous\n", sort_list[i].segment_name, | |
261 | sort_list[i+1].segment_name); | |
b2300b9e HY |
262 | rc = -EINVAL; |
263 | goto out; | |
264 | } | |
265 | /* EN and EW are allowed in a block device */ | |
266 | if (sort_list[i].segment_type != sort_list[i+1].segment_type) { | |
267 | if (!(sort_list[i].segment_type & SEGMENT_EXCLUSIVE) || | |
268 | (sort_list[i].segment_type == SEG_TYPE_ER) || | |
269 | !(sort_list[i+1].segment_type & | |
270 | SEGMENT_EXCLUSIVE) || | |
271 | (sort_list[i+1].segment_type == SEG_TYPE_ER)) { | |
93098bf0 HY |
272 | pr_err("DCSS %s and DCSS %s have " |
273 | "incompatible types\n", | |
274 | sort_list[i].segment_name, | |
275 | sort_list[i+1].segment_name); | |
b2300b9e HY |
276 | rc = -EINVAL; |
277 | goto out; | |
278 | } | |
279 | } | |
280 | } | |
281 | rc = 0; | |
282 | out: | |
283 | kfree(sort_list); | |
284 | return rc; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Load a segment | |
289 | */ | |
290 | static int | |
291 | dcssblk_load_segment(char *name, struct segment_info **seg_info) | |
292 | { | |
293 | int rc; | |
294 | ||
295 | /* already loaded? */ | |
296 | down_read(&dcssblk_devices_sem); | |
297 | *seg_info = dcssblk_get_segment_by_name(name); | |
298 | up_read(&dcssblk_devices_sem); | |
299 | if (*seg_info != NULL) | |
300 | return -EEXIST; | |
301 | ||
302 | /* get a struct segment_info */ | |
303 | *seg_info = kzalloc(sizeof(struct segment_info), GFP_KERNEL); | |
304 | if (*seg_info == NULL) | |
305 | return -ENOMEM; | |
306 | ||
307 | strcpy((*seg_info)->segment_name, name); | |
308 | ||
309 | /* load the segment */ | |
310 | rc = segment_load(name, SEGMENT_SHARED, | |
311 | &(*seg_info)->start, &(*seg_info)->end); | |
312 | if (rc < 0) { | |
313 | segment_warning(rc, (*seg_info)->segment_name); | |
314 | kfree(*seg_info); | |
315 | } else { | |
316 | INIT_LIST_HEAD(&(*seg_info)->lh); | |
317 | (*seg_info)->segment_type = rc; | |
318 | } | |
319 | return rc; | |
320 | } | |
321 | ||
1da177e4 LT |
322 | /* |
323 | * device attribute for switching shared/nonshared (exclusive) | |
324 | * operation (show + store) | |
325 | */ | |
326 | static ssize_t | |
e404e274 | 327 | dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
328 | { |
329 | struct dcssblk_dev_info *dev_info; | |
330 | ||
331 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
332 | return sprintf(buf, dev_info->is_shared ? "1\n" : "0\n"); | |
333 | } | |
334 | ||
335 | static ssize_t | |
e404e274 | 336 | dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
337 | { |
338 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 339 | struct segment_info *entry, *temp; |
1da177e4 LT |
340 | int rc; |
341 | ||
ded77fb4 | 342 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 343 | return -EINVAL; |
1da177e4 LT |
344 | down_write(&dcssblk_devices_sem); |
345 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
346 | if (atomic_read(&dev_info->use_count)) { | |
1da177e4 LT |
347 | rc = -EBUSY; |
348 | goto out; | |
349 | } | |
350 | if (inbuf[0] == '1') { | |
b2300b9e HY |
351 | /* reload segments in shared mode */ |
352 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
353 | rc = segment_modify_shared(entry->segment_name, | |
354 | SEGMENT_SHARED); | |
355 | if (rc < 0) { | |
356 | BUG_ON(rc == -EINVAL); | |
357 | if (rc != -EAGAIN) | |
358 | goto removeseg; | |
1da177e4 LT |
359 | } |
360 | } | |
b2300b9e HY |
361 | dev_info->is_shared = 1; |
362 | switch (dev_info->segment_type) { | |
363 | case SEG_TYPE_SR: | |
364 | case SEG_TYPE_ER: | |
365 | case SEG_TYPE_SC: | |
366 | set_disk_ro(dev_info->gd, 1); | |
367 | } | |
1da177e4 | 368 | } else if (inbuf[0] == '0') { |
b2300b9e | 369 | /* reload segments in exclusive mode */ |
1da177e4 | 370 | if (dev_info->segment_type == SEG_TYPE_SC) { |
93098bf0 HY |
371 | pr_err("DCSS %s is of type SC and cannot be " |
372 | "loaded as exclusive-writable\n", | |
373 | dev_info->segment_name); | |
1da177e4 LT |
374 | rc = -EINVAL; |
375 | goto out; | |
376 | } | |
b2300b9e HY |
377 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
378 | rc = segment_modify_shared(entry->segment_name, | |
379 | SEGMENT_EXCLUSIVE); | |
380 | if (rc < 0) { | |
381 | BUG_ON(rc == -EINVAL); | |
382 | if (rc != -EAGAIN) | |
383 | goto removeseg; | |
384 | } | |
1da177e4 | 385 | } |
b2300b9e HY |
386 | dev_info->is_shared = 0; |
387 | set_disk_ro(dev_info->gd, 0); | |
1da177e4 | 388 | } else { |
1da177e4 LT |
389 | rc = -EINVAL; |
390 | goto out; | |
391 | } | |
392 | rc = count; | |
393 | goto out; | |
394 | ||
395 | removeseg: | |
93098bf0 HY |
396 | pr_err("DCSS device %s is removed after a failed access mode " |
397 | "change\n", dev_info->segment_name); | |
b2300b9e HY |
398 | temp = entry; |
399 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
400 | if (entry != temp) | |
401 | segment_unload(entry->segment_name); | |
402 | } | |
1da177e4 LT |
403 | list_del(&dev_info->lh); |
404 | ||
7a2765f6 DW |
405 | kill_dax(dev_info->dax_dev); |
406 | put_dax(dev_info->dax_dev); | |
1da177e4 | 407 | del_gendisk(dev_info->gd); |
1312f40e | 408 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
409 | dev_info->gd->queue = NULL; |
410 | put_disk(dev_info->gd); | |
0b60f9ea TH |
411 | up_write(&dcssblk_devices_sem); |
412 | ||
413 | if (device_remove_file_self(dev, attr)) { | |
414 | device_unregister(dev); | |
415 | put_device(dev); | |
416 | } | |
417 | return rc; | |
1da177e4 LT |
418 | out: |
419 | up_write(&dcssblk_devices_sem); | |
420 | return rc; | |
421 | } | |
521b3d79 SO |
422 | static DEVICE_ATTR(shared, S_IWUSR | S_IRUSR, dcssblk_shared_show, |
423 | dcssblk_shared_store); | |
1da177e4 LT |
424 | |
425 | /* | |
426 | * device attribute for save operation on current copy | |
427 | * of the segment. If the segment is busy, saving will | |
428 | * become pending until it gets released, which can be | |
429 | * undone by storing a non-true value to this entry. | |
430 | * (show + store) | |
431 | */ | |
432 | static ssize_t | |
e404e274 | 433 | dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
434 | { |
435 | struct dcssblk_dev_info *dev_info; | |
436 | ||
437 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
438 | return sprintf(buf, dev_info->save_pending ? "1\n" : "0\n"); | |
439 | } | |
440 | ||
441 | static ssize_t | |
e404e274 | 442 | dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) |
1da177e4 LT |
443 | { |
444 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 445 | struct segment_info *entry; |
1da177e4 | 446 | |
ded77fb4 | 447 | if ((count > 1) && (inbuf[1] != '\n') && (inbuf[1] != '\0')) |
1da177e4 | 448 | return -EINVAL; |
1da177e4 LT |
449 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); |
450 | ||
451 | down_write(&dcssblk_devices_sem); | |
452 | if (inbuf[0] == '1') { | |
453 | if (atomic_read(&dev_info->use_count) == 0) { | |
454 | // device is idle => we save immediately | |
93098bf0 HY |
455 | pr_info("All DCSSs that map to device %s are " |
456 | "saved\n", dev_info->segment_name); | |
b2300b9e | 457 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
458 | if (entry->segment_type == SEG_TYPE_EN || |
459 | entry->segment_type == SEG_TYPE_SN) | |
460 | pr_warn("DCSS %s is of type SN or EN" | |
461 | " and cannot be saved\n", | |
462 | entry->segment_name); | |
463 | else | |
464 | segment_save(entry->segment_name); | |
b2300b9e | 465 | } |
1da177e4 LT |
466 | } else { |
467 | // device is busy => we save it when it becomes | |
468 | // idle in dcssblk_release | |
93098bf0 HY |
469 | pr_info("Device %s is in use, its DCSSs will be " |
470 | "saved when it becomes idle\n", | |
471 | dev_info->segment_name); | |
1da177e4 LT |
472 | dev_info->save_pending = 1; |
473 | } | |
474 | } else if (inbuf[0] == '0') { | |
475 | if (dev_info->save_pending) { | |
476 | // device is busy & the user wants to undo his save | |
477 | // request | |
478 | dev_info->save_pending = 0; | |
93098bf0 HY |
479 | pr_info("A pending save request for device %s " |
480 | "has been canceled\n", | |
481 | dev_info->segment_name); | |
1da177e4 LT |
482 | } |
483 | } else { | |
484 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
485 | return -EINVAL; |
486 | } | |
487 | up_write(&dcssblk_devices_sem); | |
488 | return count; | |
489 | } | |
521b3d79 SO |
490 | static DEVICE_ATTR(save, S_IWUSR | S_IRUSR, dcssblk_save_show, |
491 | dcssblk_save_store); | |
1da177e4 | 492 | |
b2300b9e HY |
493 | /* |
494 | * device attribute for showing all segments in a device | |
495 | */ | |
496 | static ssize_t | |
497 | dcssblk_seglist_show(struct device *dev, struct device_attribute *attr, | |
498 | char *buf) | |
499 | { | |
500 | int i; | |
501 | ||
502 | struct dcssblk_dev_info *dev_info; | |
503 | struct segment_info *entry; | |
504 | ||
505 | down_read(&dcssblk_devices_sem); | |
506 | dev_info = container_of(dev, struct dcssblk_dev_info, dev); | |
507 | i = 0; | |
508 | buf[0] = '\0'; | |
509 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
510 | strcpy(&buf[i], entry->segment_name); | |
511 | i += strlen(entry->segment_name); | |
512 | buf[i] = '\n'; | |
513 | i++; | |
514 | } | |
515 | up_read(&dcssblk_devices_sem); | |
516 | return i; | |
517 | } | |
521b3d79 SO |
518 | static DEVICE_ATTR(seglist, S_IRUSR, dcssblk_seglist_show, NULL); |
519 | ||
520 | static struct attribute *dcssblk_dev_attrs[] = { | |
521 | &dev_attr_shared.attr, | |
522 | &dev_attr_save.attr, | |
523 | &dev_attr_seglist.attr, | |
524 | NULL, | |
525 | }; | |
526 | static struct attribute_group dcssblk_dev_attr_group = { | |
527 | .attrs = dcssblk_dev_attrs, | |
528 | }; | |
529 | static const struct attribute_group *dcssblk_dev_attr_groups[] = { | |
530 | &dcssblk_dev_attr_group, | |
531 | NULL, | |
532 | }; | |
b2300b9e | 533 | |
1da177e4 LT |
534 | /* |
535 | * device attribute for adding devices | |
536 | */ | |
537 | static ssize_t | |
e404e274 | 538 | dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 539 | { |
b2300b9e | 540 | int rc, i, j, num_of_segments; |
1da177e4 | 541 | struct dcssblk_dev_info *dev_info; |
b2300b9e | 542 | struct segment_info *seg_info, *temp; |
1da177e4 LT |
543 | char *local_buf; |
544 | unsigned long seg_byte_size; | |
545 | ||
546 | dev_info = NULL; | |
b2300b9e | 547 | seg_info = NULL; |
1da177e4 LT |
548 | if (dev != dcssblk_root_dev) { |
549 | rc = -EINVAL; | |
550 | goto out_nobuf; | |
551 | } | |
b2300b9e HY |
552 | if ((count < 1) || (buf[0] == '\0') || (buf[0] == '\n')) { |
553 | rc = -ENAMETOOLONG; | |
554 | goto out_nobuf; | |
555 | } | |
556 | ||
1da177e4 LT |
557 | local_buf = kmalloc(count + 1, GFP_KERNEL); |
558 | if (local_buf == NULL) { | |
559 | rc = -ENOMEM; | |
560 | goto out_nobuf; | |
561 | } | |
b2300b9e | 562 | |
1da177e4 LT |
563 | /* |
564 | * parse input | |
565 | */ | |
b2300b9e | 566 | num_of_segments = 0; |
3a9f9183 | 567 | for (i = 0; (i < count && (buf[i] != '\0') && (buf[i] != '\n')); i++) { |
42cfc6b5 MS |
568 | for (j = i; j < count && |
569 | (buf[j] != ':') && | |
b2300b9e | 570 | (buf[j] != '\0') && |
42cfc6b5 | 571 | (buf[j] != '\n'); j++) { |
b2300b9e HY |
572 | local_buf[j-i] = toupper(buf[j]); |
573 | } | |
574 | local_buf[j-i] = '\0'; | |
575 | if (((j - i) == 0) || ((j - i) > 8)) { | |
576 | rc = -ENAMETOOLONG; | |
577 | goto seg_list_del; | |
578 | } | |
579 | ||
580 | rc = dcssblk_load_segment(local_buf, &seg_info); | |
581 | if (rc < 0) | |
582 | goto seg_list_del; | |
583 | /* | |
584 | * get a struct dcssblk_dev_info | |
585 | */ | |
586 | if (num_of_segments == 0) { | |
587 | dev_info = kzalloc(sizeof(struct dcssblk_dev_info), | |
588 | GFP_KERNEL); | |
589 | if (dev_info == NULL) { | |
590 | rc = -ENOMEM; | |
591 | goto out; | |
592 | } | |
593 | strcpy(dev_info->segment_name, local_buf); | |
594 | dev_info->segment_type = seg_info->segment_type; | |
595 | INIT_LIST_HEAD(&dev_info->seg_list); | |
596 | } | |
597 | list_add_tail(&seg_info->lh, &dev_info->seg_list); | |
598 | num_of_segments++; | |
599 | i = j; | |
600 | ||
601 | if ((buf[j] == '\0') || (buf[j] == '\n')) | |
602 | break; | |
1da177e4 | 603 | } |
b2300b9e HY |
604 | |
605 | /* no trailing colon at the end of the input */ | |
606 | if ((i > 0) && (buf[i-1] == ':')) { | |
1da177e4 | 607 | rc = -ENAMETOOLONG; |
b2300b9e | 608 | goto seg_list_del; |
1da177e4 | 609 | } |
b2300b9e HY |
610 | strlcpy(local_buf, buf, i + 1); |
611 | dev_info->num_of_segments = num_of_segments; | |
612 | rc = dcssblk_is_continuous(dev_info); | |
613 | if (rc < 0) | |
614 | goto seg_list_del; | |
615 | ||
616 | dev_info->start = dcssblk_find_lowest_addr(dev_info); | |
617 | dev_info->end = dcssblk_find_highest_addr(dev_info); | |
1da177e4 | 618 | |
ef283688 | 619 | dev_set_name(&dev_info->dev, "%s", dev_info->segment_name); |
1da177e4 | 620 | dev_info->dev.release = dcssblk_release_segment; |
521b3d79 | 621 | dev_info->dev.groups = dcssblk_dev_attr_groups; |
1da177e4 | 622 | INIT_LIST_HEAD(&dev_info->lh); |
1da177e4 LT |
623 | dev_info->gd = alloc_disk(DCSSBLK_MINORS_PER_DISK); |
624 | if (dev_info->gd == NULL) { | |
625 | rc = -ENOMEM; | |
b2300b9e | 626 | goto seg_list_del; |
1da177e4 LT |
627 | } |
628 | dev_info->gd->major = dcssblk_major; | |
629 | dev_info->gd->fops = &dcssblk_devops; | |
630 | dev_info->dcssblk_queue = blk_alloc_queue(GFP_KERNEL); | |
631 | dev_info->gd->queue = dev_info->dcssblk_queue; | |
632 | dev_info->gd->private_data = dev_info; | |
c5411dba | 633 | blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request); |
e1defc4f | 634 | blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096); |
163d4baa | 635 | queue_flag_set_unlocked(QUEUE_FLAG_DAX, dev_info->dcssblk_queue); |
b2300b9e | 636 | |
1da177e4 LT |
637 | seg_byte_size = (dev_info->end - dev_info->start + 1); |
638 | set_capacity(dev_info->gd, seg_byte_size >> 9); // size in sectors | |
93098bf0 HY |
639 | pr_info("Loaded %s with total size %lu bytes and capacity %lu " |
640 | "sectors\n", local_buf, seg_byte_size, seg_byte_size >> 9); | |
1da177e4 | 641 | |
1da177e4 LT |
642 | dev_info->save_pending = 0; |
643 | dev_info->is_shared = 1; | |
644 | dev_info->dev.parent = dcssblk_root_dev; | |
645 | ||
646 | /* | |
b2300b9e | 647 | *get minor, add to list |
1da177e4 LT |
648 | */ |
649 | down_write(&dcssblk_devices_sem); | |
b2300b9e | 650 | if (dcssblk_get_segment_by_name(local_buf)) { |
04f64b57 | 651 | rc = -EEXIST; |
b2300b9e | 652 | goto release_gd; |
04f64b57 | 653 | } |
1da177e4 | 654 | rc = dcssblk_assign_free_minor(dev_info); |
b2300b9e HY |
655 | if (rc) |
656 | goto release_gd; | |
1da177e4 | 657 | sprintf(dev_info->gd->disk_name, "dcssblk%d", |
d0591485 | 658 | dev_info->gd->first_minor); |
1da177e4 LT |
659 | list_add_tail(&dev_info->lh, &dcssblk_devices); |
660 | ||
661 | if (!try_module_get(THIS_MODULE)) { | |
662 | rc = -ENODEV; | |
b2300b9e | 663 | goto dev_list_del; |
1da177e4 LT |
664 | } |
665 | /* | |
666 | * register the device | |
667 | */ | |
668 | rc = device_register(&dev_info->dev); | |
b2300b9e | 669 | if (rc) |
521b3d79 | 670 | goto put_dev; |
1da177e4 | 671 | |
7a2765f6 DW |
672 | dev_info->dax_dev = alloc_dax(dev_info, dev_info->gd->disk_name, |
673 | &dcssblk_dax_ops); | |
674 | if (!dev_info->dax_dev) { | |
675 | rc = -ENOMEM; | |
676 | goto put_dev; | |
677 | } | |
678 | ||
521b3d79 | 679 | get_device(&dev_info->dev); |
0d52c756 | 680 | device_add_disk(&dev_info->dev, dev_info->gd); |
436d1bc7 | 681 | |
1da177e4 LT |
682 | switch (dev_info->segment_type) { |
683 | case SEG_TYPE_SR: | |
684 | case SEG_TYPE_ER: | |
685 | case SEG_TYPE_SC: | |
686 | set_disk_ro(dev_info->gd,1); | |
687 | break; | |
688 | default: | |
689 | set_disk_ro(dev_info->gd,0); | |
690 | break; | |
691 | } | |
1da177e4 LT |
692 | up_write(&dcssblk_devices_sem); |
693 | rc = count; | |
694 | goto out; | |
695 | ||
521b3d79 | 696 | put_dev: |
1da177e4 | 697 | list_del(&dev_info->lh); |
1312f40e | 698 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
699 | dev_info->gd->queue = NULL; |
700 | put_disk(dev_info->gd); | |
b2300b9e HY |
701 | list_for_each_entry(seg_info, &dev_info->seg_list, lh) { |
702 | segment_unload(seg_info->segment_name); | |
703 | } | |
1da177e4 LT |
704 | put_device(&dev_info->dev); |
705 | up_write(&dcssblk_devices_sem); | |
706 | goto out; | |
b2300b9e | 707 | dev_list_del: |
1da177e4 | 708 | list_del(&dev_info->lh); |
b2300b9e | 709 | release_gd: |
1312f40e | 710 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
711 | dev_info->gd->queue = NULL; |
712 | put_disk(dev_info->gd); | |
b2300b9e HY |
713 | up_write(&dcssblk_devices_sem); |
714 | seg_list_del: | |
715 | if (dev_info == NULL) | |
716 | goto out; | |
717 | list_for_each_entry_safe(seg_info, temp, &dev_info->seg_list, lh) { | |
718 | list_del(&seg_info->lh); | |
719 | segment_unload(seg_info->segment_name); | |
720 | kfree(seg_info); | |
721 | } | |
1da177e4 LT |
722 | kfree(dev_info); |
723 | out: | |
724 | kfree(local_buf); | |
725 | out_nobuf: | |
726 | return rc; | |
727 | } | |
728 | ||
729 | /* | |
730 | * device attribute for removing devices | |
731 | */ | |
732 | static ssize_t | |
e404e274 | 733 | dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
734 | { |
735 | struct dcssblk_dev_info *dev_info; | |
b2300b9e | 736 | struct segment_info *entry; |
1da177e4 LT |
737 | int rc, i; |
738 | char *local_buf; | |
739 | ||
740 | if (dev != dcssblk_root_dev) { | |
741 | return -EINVAL; | |
742 | } | |
743 | local_buf = kmalloc(count + 1, GFP_KERNEL); | |
744 | if (local_buf == NULL) { | |
745 | return -ENOMEM; | |
746 | } | |
747 | /* | |
748 | * parse input | |
749 | */ | |
42cfc6b5 | 750 | for (i = 0; (i < count && (*(buf+i)!='\0') && (*(buf+i)!='\n')); i++) { |
1da177e4 LT |
751 | local_buf[i] = toupper(buf[i]); |
752 | } | |
753 | local_buf[i] = '\0'; | |
754 | if ((i == 0) || (i > 8)) { | |
755 | rc = -ENAMETOOLONG; | |
756 | goto out_buf; | |
757 | } | |
758 | ||
759 | down_write(&dcssblk_devices_sem); | |
760 | dev_info = dcssblk_get_device_by_name(local_buf); | |
761 | if (dev_info == NULL) { | |
762 | up_write(&dcssblk_devices_sem); | |
baebc70a JP |
763 | pr_warn("Device %s cannot be removed because it is not a known device\n", |
764 | local_buf); | |
1da177e4 LT |
765 | rc = -ENODEV; |
766 | goto out_buf; | |
767 | } | |
768 | if (atomic_read(&dev_info->use_count) != 0) { | |
769 | up_write(&dcssblk_devices_sem); | |
baebc70a JP |
770 | pr_warn("Device %s cannot be removed while it is in use\n", |
771 | local_buf); | |
1da177e4 LT |
772 | rc = -EBUSY; |
773 | goto out_buf; | |
774 | } | |
1da177e4 | 775 | |
b2300b9e | 776 | list_del(&dev_info->lh); |
7a2765f6 DW |
777 | kill_dax(dev_info->dax_dev); |
778 | put_dax(dev_info->dax_dev); | |
1da177e4 | 779 | del_gendisk(dev_info->gd); |
1312f40e | 780 | blk_cleanup_queue(dev_info->dcssblk_queue); |
1da177e4 LT |
781 | dev_info->gd->queue = NULL; |
782 | put_disk(dev_info->gd); | |
b2300b9e HY |
783 | |
784 | /* unload all related segments */ | |
785 | list_for_each_entry(entry, &dev_info->seg_list, lh) | |
786 | segment_unload(entry->segment_name); | |
787 | ||
1da177e4 LT |
788 | up_write(&dcssblk_devices_sem); |
789 | ||
1378a683 GS |
790 | device_unregister(&dev_info->dev); |
791 | put_device(&dev_info->dev); | |
792 | ||
1da177e4 LT |
793 | rc = count; |
794 | out_buf: | |
795 | kfree(local_buf); | |
796 | return rc; | |
797 | } | |
798 | ||
799 | static int | |
46d74326 | 800 | dcssblk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
801 | { |
802 | struct dcssblk_dev_info *dev_info; | |
803 | int rc; | |
804 | ||
46d74326 | 805 | dev_info = bdev->bd_disk->private_data; |
1da177e4 LT |
806 | if (NULL == dev_info) { |
807 | rc = -ENODEV; | |
808 | goto out; | |
809 | } | |
810 | atomic_inc(&dev_info->use_count); | |
46d74326 | 811 | bdev->bd_block_size = 4096; |
1da177e4 LT |
812 | rc = 0; |
813 | out: | |
814 | return rc; | |
815 | } | |
816 | ||
db2a144b | 817 | static void |
46d74326 | 818 | dcssblk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 819 | { |
46d74326 | 820 | struct dcssblk_dev_info *dev_info = disk->private_data; |
b2300b9e | 821 | struct segment_info *entry; |
1da177e4 | 822 | |
46d74326 | 823 | if (!dev_info) { |
db2a144b AV |
824 | WARN_ON(1); |
825 | return; | |
1da177e4 LT |
826 | } |
827 | down_write(&dcssblk_devices_sem); | |
828 | if (atomic_dec_and_test(&dev_info->use_count) | |
829 | && (dev_info->save_pending)) { | |
93098bf0 HY |
830 | pr_info("Device %s has become idle and is being saved " |
831 | "now\n", dev_info->segment_name); | |
b2300b9e | 832 | list_for_each_entry(entry, &dev_info->seg_list, lh) { |
5be6fdc0 GS |
833 | if (entry->segment_type == SEG_TYPE_EN || |
834 | entry->segment_type == SEG_TYPE_SN) | |
835 | pr_warn("DCSS %s is of type SN or EN and cannot" | |
836 | " be saved\n", entry->segment_name); | |
837 | else | |
838 | segment_save(entry->segment_name); | |
b2300b9e | 839 | } |
1da177e4 LT |
840 | dev_info->save_pending = 0; |
841 | } | |
842 | up_write(&dcssblk_devices_sem); | |
1da177e4 LT |
843 | } |
844 | ||
dece1635 | 845 | static blk_qc_t |
165125e1 | 846 | dcssblk_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
847 | { |
848 | struct dcssblk_dev_info *dev_info; | |
7988613b KO |
849 | struct bio_vec bvec; |
850 | struct bvec_iter iter; | |
1da177e4 LT |
851 | unsigned long index; |
852 | unsigned long page_addr; | |
853 | unsigned long source_addr; | |
854 | unsigned long bytes_done; | |
1da177e4 | 855 | |
af67c31f | 856 | blk_queue_split(q, &bio); |
54efd50b | 857 | |
1da177e4 | 858 | bytes_done = 0; |
74d46992 | 859 | dev_info = bio->bi_disk->private_data; |
1da177e4 LT |
860 | if (dev_info == NULL) |
861 | goto fail; | |
4f024f37 KO |
862 | if ((bio->bi_iter.bi_sector & 7) != 0 || |
863 | (bio->bi_iter.bi_size & 4095) != 0) | |
1da177e4 LT |
864 | /* Request is not page-aligned. */ |
865 | goto fail; | |
74d46992 | 866 | if (bio_end_sector(bio) > get_capacity(bio->bi_disk)) { |
1da177e4 LT |
867 | /* Request beyond end of DCSS segment. */ |
868 | goto fail; | |
869 | } | |
420edbcc CO |
870 | /* verify data transfer direction */ |
871 | if (dev_info->is_shared) { | |
872 | switch (dev_info->segment_type) { | |
873 | case SEG_TYPE_SR: | |
874 | case SEG_TYPE_ER: | |
875 | case SEG_TYPE_SC: | |
876 | /* cannot write to these segments */ | |
877 | if (bio_data_dir(bio) == WRITE) { | |
baebc70a JP |
878 | pr_warn("Writing to %s failed because it is a read-only device\n", |
879 | dev_name(&dev_info->dev)); | |
420edbcc CO |
880 | goto fail; |
881 | } | |
882 | } | |
883 | } | |
884 | ||
4f024f37 | 885 | index = (bio->bi_iter.bi_sector >> 3); |
7988613b | 886 | bio_for_each_segment(bvec, bio, iter) { |
1da177e4 | 887 | page_addr = (unsigned long) |
7988613b | 888 | page_address(bvec.bv_page) + bvec.bv_offset; |
1da177e4 | 889 | source_addr = dev_info->start + (index<<12) + bytes_done; |
7988613b | 890 | if (unlikely((page_addr & 4095) != 0) || (bvec.bv_len & 4095) != 0) |
1da177e4 LT |
891 | // More paranoia. |
892 | goto fail; | |
893 | if (bio_data_dir(bio) == READ) { | |
894 | memcpy((void*)page_addr, (void*)source_addr, | |
7988613b | 895 | bvec.bv_len); |
1da177e4 LT |
896 | } else { |
897 | memcpy((void*)source_addr, (void*)page_addr, | |
7988613b | 898 | bvec.bv_len); |
1da177e4 | 899 | } |
7988613b | 900 | bytes_done += bvec.bv_len; |
1da177e4 | 901 | } |
4246a0b6 | 902 | bio_endio(bio); |
dece1635 | 903 | return BLK_QC_T_NONE; |
1da177e4 | 904 | fail: |
6712ecf8 | 905 | bio_io_error(bio); |
dece1635 | 906 | return BLK_QC_T_NONE; |
420edbcc CO |
907 | } |
908 | ||
dd22f551 | 909 | static long |
7a2765f6 DW |
910 | __dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff, |
911 | long nr_pages, void **kaddr, pfn_t *pfn) | |
912 | { | |
913 | resource_size_t offset = pgoff * PAGE_SIZE; | |
914 | unsigned long dev_sz; | |
915 | ||
916 | dev_sz = dev_info->end - dev_info->start + 1; | |
917 | *kaddr = (void *) dev_info->start + offset; | |
918 | *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), PFN_DEV); | |
919 | ||
920 | return (dev_sz - offset) / PAGE_SIZE; | |
921 | } | |
922 | ||
7a2765f6 DW |
923 | static long |
924 | dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, | |
925 | long nr_pages, void **kaddr, pfn_t *pfn) | |
926 | { | |
927 | struct dcssblk_dev_info *dev_info = dax_get_private(dax_dev); | |
30afcb4b | 928 | |
7a2765f6 | 929 | return __dcssblk_direct_access(dev_info, pgoff, nr_pages, kaddr, pfn); |
1da177e4 LT |
930 | } |
931 | ||
932 | static void | |
933 | dcssblk_check_params(void) | |
934 | { | |
935 | int rc, i, j, k; | |
b2300b9e | 936 | char buf[DCSSBLK_PARM_LEN + 1]; |
1da177e4 LT |
937 | struct dcssblk_dev_info *dev_info; |
938 | ||
939 | for (i = 0; (i < DCSSBLK_PARM_LEN) && (dcssblk_segments[i] != '\0'); | |
940 | i++) { | |
42cfc6b5 MS |
941 | for (j = i; (j < DCSSBLK_PARM_LEN) && |
942 | (dcssblk_segments[j] != ',') && | |
1da177e4 | 943 | (dcssblk_segments[j] != '\0') && |
42cfc6b5 | 944 | (dcssblk_segments[j] != '('); j++) |
1da177e4 LT |
945 | { |
946 | buf[j-i] = dcssblk_segments[j]; | |
947 | } | |
948 | buf[j-i] = '\0'; | |
f901e5d1 | 949 | rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); |
1da177e4 | 950 | if ((rc >= 0) && (dcssblk_segments[j] == '(')) { |
b2300b9e | 951 | for (k = 0; (buf[k] != ':') && (buf[k] != '\0'); k++) |
1da177e4 | 952 | buf[k] = toupper(buf[k]); |
b2300b9e | 953 | buf[k] = '\0'; |
1da177e4 LT |
954 | if (!strncmp(&dcssblk_segments[j], "(local)", 7)) { |
955 | down_read(&dcssblk_devices_sem); | |
956 | dev_info = dcssblk_get_device_by_name(buf); | |
957 | up_read(&dcssblk_devices_sem); | |
958 | if (dev_info) | |
959 | dcssblk_shared_store(&dev_info->dev, | |
f901e5d1 | 960 | NULL, "0\n", 2); |
1da177e4 LT |
961 | } |
962 | } | |
963 | while ((dcssblk_segments[j] != ',') && | |
964 | (dcssblk_segments[j] != '\0')) | |
965 | { | |
966 | j++; | |
967 | } | |
968 | if (dcssblk_segments[j] == '\0') | |
969 | break; | |
970 | i = j; | |
971 | } | |
972 | } | |
973 | ||
c369527f GS |
974 | /* |
975 | * Suspend / Resume | |
976 | */ | |
977 | static int dcssblk_freeze(struct device *dev) | |
978 | { | |
979 | struct dcssblk_dev_info *dev_info; | |
980 | int rc = 0; | |
981 | ||
982 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
983 | switch (dev_info->segment_type) { | |
984 | case SEG_TYPE_SR: | |
985 | case SEG_TYPE_ER: | |
986 | case SEG_TYPE_SC: | |
987 | if (!dev_info->is_shared) | |
988 | rc = -EINVAL; | |
989 | break; | |
990 | default: | |
991 | rc = -EINVAL; | |
992 | break; | |
993 | } | |
994 | if (rc) | |
995 | break; | |
996 | } | |
997 | if (rc) | |
2c48c4d6 CB |
998 | pr_err("Suspending the system failed because DCSS device %s " |
999 | "is writable\n", | |
c369527f GS |
1000 | dev_info->segment_name); |
1001 | return rc; | |
1002 | } | |
1003 | ||
1004 | static int dcssblk_restore(struct device *dev) | |
1005 | { | |
1006 | struct dcssblk_dev_info *dev_info; | |
1007 | struct segment_info *entry; | |
1008 | unsigned long start, end; | |
1009 | int rc = 0; | |
1010 | ||
1011 | list_for_each_entry(dev_info, &dcssblk_devices, lh) { | |
1012 | list_for_each_entry(entry, &dev_info->seg_list, lh) { | |
1013 | segment_unload(entry->segment_name); | |
1014 | rc = segment_load(entry->segment_name, SEGMENT_SHARED, | |
1015 | &start, &end); | |
1016 | if (rc < 0) { | |
1017 | // TODO in_use check ? | |
1018 | segment_warning(rc, entry->segment_name); | |
1019 | goto out_panic; | |
1020 | } | |
1021 | if (start != entry->start || end != entry->end) { | |
2c48c4d6 CB |
1022 | pr_err("The address range of DCSS %s changed " |
1023 | "while the system was suspended\n", | |
c369527f GS |
1024 | entry->segment_name); |
1025 | goto out_panic; | |
1026 | } | |
1027 | } | |
1028 | } | |
1029 | return 0; | |
1030 | out_panic: | |
1031 | panic("fatal dcssblk resume error\n"); | |
1032 | } | |
1033 | ||
1034 | static int dcssblk_thaw(struct device *dev) | |
1035 | { | |
1036 | return 0; | |
1037 | } | |
1038 | ||
47145210 | 1039 | static const struct dev_pm_ops dcssblk_pm_ops = { |
c369527f GS |
1040 | .freeze = dcssblk_freeze, |
1041 | .thaw = dcssblk_thaw, | |
1042 | .restore = dcssblk_restore, | |
1043 | }; | |
1044 | ||
1045 | static struct platform_driver dcssblk_pdrv = { | |
1046 | .driver = { | |
1047 | .name = "dcssblk", | |
c369527f GS |
1048 | .pm = &dcssblk_pm_ops, |
1049 | }, | |
1050 | }; | |
1051 | ||
1052 | static struct platform_device *dcssblk_pdev; | |
1053 | ||
1054 | ||
1da177e4 LT |
1055 | /* |
1056 | * The init/exit functions. | |
1057 | */ | |
1058 | static void __exit | |
1059 | dcssblk_exit(void) | |
1060 | { | |
c369527f GS |
1061 | platform_device_unregister(dcssblk_pdev); |
1062 | platform_driver_unregister(&dcssblk_pdrv); | |
035da16f | 1063 | root_device_unregister(dcssblk_root_dev); |
00d59405 | 1064 | unregister_blkdev(dcssblk_major, DCSSBLK_NAME); |
1da177e4 LT |
1065 | } |
1066 | ||
1067 | static int __init | |
1068 | dcssblk_init(void) | |
1069 | { | |
1070 | int rc; | |
1071 | ||
c369527f GS |
1072 | rc = platform_driver_register(&dcssblk_pdrv); |
1073 | if (rc) | |
1da177e4 | 1074 | return rc; |
c369527f GS |
1075 | |
1076 | dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL, | |
1077 | 0); | |
1078 | if (IS_ERR(dcssblk_pdev)) { | |
1079 | rc = PTR_ERR(dcssblk_pdev); | |
1080 | goto out_pdrv; | |
1da177e4 | 1081 | } |
c369527f GS |
1082 | |
1083 | dcssblk_root_dev = root_device_register("dcssblk"); | |
1084 | if (IS_ERR(dcssblk_root_dev)) { | |
1085 | rc = PTR_ERR(dcssblk_root_dev); | |
1086 | goto out_pdev; | |
1da177e4 | 1087 | } |
c369527f GS |
1088 | rc = device_create_file(dcssblk_root_dev, &dev_attr_add); |
1089 | if (rc) | |
1090 | goto out_root; | |
1091 | rc = device_create_file(dcssblk_root_dev, &dev_attr_remove); | |
1092 | if (rc) | |
1093 | goto out_root; | |
1da177e4 | 1094 | rc = register_blkdev(0, DCSSBLK_NAME); |
c369527f GS |
1095 | if (rc < 0) |
1096 | goto out_root; | |
1da177e4 LT |
1097 | dcssblk_major = rc; |
1098 | init_rwsem(&dcssblk_devices_sem); | |
1099 | ||
1100 | dcssblk_check_params(); | |
1da177e4 | 1101 | return 0; |
c369527f GS |
1102 | |
1103 | out_root: | |
1104 | root_device_unregister(dcssblk_root_dev); | |
1105 | out_pdev: | |
1106 | platform_device_unregister(dcssblk_pdev); | |
1107 | out_pdrv: | |
1108 | platform_driver_unregister(&dcssblk_pdrv); | |
1109 | return rc; | |
1da177e4 LT |
1110 | } |
1111 | ||
1112 | module_init(dcssblk_init); | |
1113 | module_exit(dcssblk_exit); | |
1114 | ||
1115 | module_param_string(segments, dcssblk_segments, DCSSBLK_PARM_LEN, 0444); | |
1116 | MODULE_PARM_DESC(segments, "Name of DCSS segment(s) to be loaded, " | |
b2300b9e HY |
1117 | "comma-separated list, names in each set separated " |
1118 | "by commas are separated by colons, each set contains " | |
1119 | "names of contiguous segments and each name max. 8 chars.\n" | |
1120 | "Adding \"(local)\" to the end of each set equals echoing 0 " | |
1121 | "to /sys/devices/dcssblk/<device name>/shared after loading " | |
1122 | "the contiguous segments - \n" | |
1123 | "e.g. segments=\"mydcss1,mydcss2:mydcss3,mydcss4(local)\""); | |
1da177e4 LT |
1124 | |
1125 | MODULE_LICENSE("GPL"); |