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5212e11f VV |
1 | /* |
2 | * Block Translation Table | |
3 | * Copyright (c) 2014-2015, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | #include <linux/highmem.h> | |
15 | #include <linux/debugfs.h> | |
16 | #include <linux/blkdev.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/hdreg.h> | |
21 | #include <linux/genhd.h> | |
22 | #include <linux/sizes.h> | |
23 | #include <linux/ndctl.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/nd.h> | |
23c47d2a | 26 | #include <linux/backing-dev.h> |
5212e11f VV |
27 | #include "btt.h" |
28 | #include "nd.h" | |
29 | ||
30 | enum log_ent_request { | |
31 | LOG_NEW_ENT = 0, | |
32 | LOG_OLD_ENT | |
33 | }; | |
34 | ||
86652d2e VV |
35 | static struct device *to_dev(struct arena_info *arena) |
36 | { | |
37 | return &arena->nd_btt->dev; | |
38 | } | |
39 | ||
d9b83c75 VV |
40 | static u64 adjust_initial_offset(struct nd_btt *nd_btt, u64 offset) |
41 | { | |
42 | return offset + nd_btt->initial_offset; | |
43 | } | |
44 | ||
5212e11f | 45 | static int arena_read_bytes(struct arena_info *arena, resource_size_t offset, |
3ae3d67b | 46 | void *buf, size_t n, unsigned long flags) |
5212e11f VV |
47 | { |
48 | struct nd_btt *nd_btt = arena->nd_btt; | |
49 | struct nd_namespace_common *ndns = nd_btt->ndns; | |
50 | ||
14e49454 | 51 | /* arena offsets may be shifted from the base of the device */ |
d9b83c75 | 52 | offset = adjust_initial_offset(nd_btt, offset); |
3ae3d67b | 53 | return nvdimm_read_bytes(ndns, offset, buf, n, flags); |
5212e11f VV |
54 | } |
55 | ||
56 | static int arena_write_bytes(struct arena_info *arena, resource_size_t offset, | |
3ae3d67b | 57 | void *buf, size_t n, unsigned long flags) |
5212e11f VV |
58 | { |
59 | struct nd_btt *nd_btt = arena->nd_btt; | |
60 | struct nd_namespace_common *ndns = nd_btt->ndns; | |
61 | ||
14e49454 | 62 | /* arena offsets may be shifted from the base of the device */ |
d9b83c75 | 63 | offset = adjust_initial_offset(nd_btt, offset); |
3ae3d67b | 64 | return nvdimm_write_bytes(ndns, offset, buf, n, flags); |
5212e11f VV |
65 | } |
66 | ||
67 | static int btt_info_write(struct arena_info *arena, struct btt_sb *super) | |
68 | { | |
69 | int ret; | |
70 | ||
b177fe85 VV |
71 | /* |
72 | * infooff and info2off should always be at least 512B aligned. | |
73 | * We rely on that to make sure rw_bytes does error clearing | |
74 | * correctly, so make sure that is the case. | |
75 | */ | |
86652d2e VV |
76 | dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->infooff, 512), |
77 | "arena->infooff: %#llx is unaligned\n", arena->infooff); | |
78 | dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->info2off, 512), | |
79 | "arena->info2off: %#llx is unaligned\n", arena->info2off); | |
b177fe85 | 80 | |
5212e11f | 81 | ret = arena_write_bytes(arena, arena->info2off, super, |
3ae3d67b | 82 | sizeof(struct btt_sb), 0); |
5212e11f VV |
83 | if (ret) |
84 | return ret; | |
85 | ||
86 | return arena_write_bytes(arena, arena->infooff, super, | |
3ae3d67b | 87 | sizeof(struct btt_sb), 0); |
5212e11f VV |
88 | } |
89 | ||
90 | static int btt_info_read(struct arena_info *arena, struct btt_sb *super) | |
91 | { | |
5212e11f | 92 | return arena_read_bytes(arena, arena->infooff, super, |
3ae3d67b | 93 | sizeof(struct btt_sb), 0); |
5212e11f VV |
94 | } |
95 | ||
96 | /* | |
97 | * 'raw' version of btt_map write | |
98 | * Assumptions: | |
99 | * mapping is in little-endian | |
100 | * mapping contains 'E' and 'Z' flags as desired | |
101 | */ | |
3ae3d67b VV |
102 | static int __btt_map_write(struct arena_info *arena, u32 lba, __le32 mapping, |
103 | unsigned long flags) | |
5212e11f VV |
104 | { |
105 | u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE); | |
106 | ||
86652d2e VV |
107 | if (unlikely(lba >= arena->external_nlba)) |
108 | dev_err_ratelimited(to_dev(arena), | |
109 | "%s: lba %#x out of range (max: %#x)\n", | |
110 | __func__, lba, arena->external_nlba); | |
3ae3d67b | 111 | return arena_write_bytes(arena, ns_off, &mapping, MAP_ENT_SIZE, flags); |
5212e11f VV |
112 | } |
113 | ||
114 | static int btt_map_write(struct arena_info *arena, u32 lba, u32 mapping, | |
3ae3d67b | 115 | u32 z_flag, u32 e_flag, unsigned long rwb_flags) |
5212e11f VV |
116 | { |
117 | u32 ze; | |
118 | __le32 mapping_le; | |
119 | ||
120 | /* | |
121 | * This 'mapping' is supposed to be just the LBA mapping, without | |
122 | * any flags set, so strip the flag bits. | |
123 | */ | |
0595d539 | 124 | mapping = ent_lba(mapping); |
5212e11f VV |
125 | |
126 | ze = (z_flag << 1) + e_flag; | |
127 | switch (ze) { | |
128 | case 0: | |
129 | /* | |
130 | * We want to set neither of the Z or E flags, and | |
131 | * in the actual layout, this means setting the bit | |
132 | * positions of both to '1' to indicate a 'normal' | |
133 | * map entry | |
134 | */ | |
135 | mapping |= MAP_ENT_NORMAL; | |
136 | break; | |
137 | case 1: | |
138 | mapping |= (1 << MAP_ERR_SHIFT); | |
139 | break; | |
140 | case 2: | |
141 | mapping |= (1 << MAP_TRIM_SHIFT); | |
142 | break; | |
143 | default: | |
144 | /* | |
145 | * The case where Z and E are both sent in as '1' could be | |
146 | * construed as a valid 'normal' case, but we decide not to, | |
147 | * to avoid confusion | |
148 | */ | |
86652d2e VV |
149 | dev_err_ratelimited(to_dev(arena), |
150 | "Invalid use of Z and E flags\n"); | |
5212e11f VV |
151 | return -EIO; |
152 | } | |
153 | ||
154 | mapping_le = cpu_to_le32(mapping); | |
3ae3d67b | 155 | return __btt_map_write(arena, lba, mapping_le, rwb_flags); |
5212e11f VV |
156 | } |
157 | ||
158 | static int btt_map_read(struct arena_info *arena, u32 lba, u32 *mapping, | |
3ae3d67b | 159 | int *trim, int *error, unsigned long rwb_flags) |
5212e11f VV |
160 | { |
161 | int ret; | |
162 | __le32 in; | |
163 | u32 raw_mapping, postmap, ze, z_flag, e_flag; | |
164 | u64 ns_off = arena->mapoff + (lba * MAP_ENT_SIZE); | |
165 | ||
86652d2e VV |
166 | if (unlikely(lba >= arena->external_nlba)) |
167 | dev_err_ratelimited(to_dev(arena), | |
168 | "%s: lba %#x out of range (max: %#x)\n", | |
169 | __func__, lba, arena->external_nlba); | |
5212e11f | 170 | |
3ae3d67b | 171 | ret = arena_read_bytes(arena, ns_off, &in, MAP_ENT_SIZE, rwb_flags); |
5212e11f VV |
172 | if (ret) |
173 | return ret; | |
174 | ||
175 | raw_mapping = le32_to_cpu(in); | |
176 | ||
0595d539 VV |
177 | z_flag = ent_z_flag(raw_mapping); |
178 | e_flag = ent_e_flag(raw_mapping); | |
5212e11f | 179 | ze = (z_flag << 1) + e_flag; |
0595d539 | 180 | postmap = ent_lba(raw_mapping); |
5212e11f VV |
181 | |
182 | /* Reuse the {z,e}_flag variables for *trim and *error */ | |
183 | z_flag = 0; | |
184 | e_flag = 0; | |
185 | ||
186 | switch (ze) { | |
187 | case 0: | |
188 | /* Initial state. Return postmap = premap */ | |
189 | *mapping = lba; | |
190 | break; | |
191 | case 1: | |
192 | *mapping = postmap; | |
193 | e_flag = 1; | |
194 | break; | |
195 | case 2: | |
196 | *mapping = postmap; | |
197 | z_flag = 1; | |
198 | break; | |
199 | case 3: | |
200 | *mapping = postmap; | |
201 | break; | |
202 | default: | |
203 | return -EIO; | |
204 | } | |
205 | ||
206 | if (trim) | |
207 | *trim = z_flag; | |
208 | if (error) | |
209 | *error = e_flag; | |
210 | ||
211 | return ret; | |
212 | } | |
213 | ||
24e3a7fb VV |
214 | static int btt_log_group_read(struct arena_info *arena, u32 lane, |
215 | struct log_group *log) | |
5212e11f | 216 | { |
5212e11f | 217 | return arena_read_bytes(arena, |
24e3a7fb VV |
218 | arena->logoff + (lane * LOG_GRP_SIZE), log, |
219 | LOG_GRP_SIZE, 0); | |
5212e11f VV |
220 | } |
221 | ||
222 | static struct dentry *debugfs_root; | |
223 | ||
224 | static void arena_debugfs_init(struct arena_info *a, struct dentry *parent, | |
225 | int idx) | |
226 | { | |
227 | char dirname[32]; | |
228 | struct dentry *d; | |
229 | ||
230 | /* If for some reason, parent bttN was not created, exit */ | |
231 | if (!parent) | |
232 | return; | |
233 | ||
234 | snprintf(dirname, 32, "arena%d", idx); | |
235 | d = debugfs_create_dir(dirname, parent); | |
236 | if (IS_ERR_OR_NULL(d)) | |
237 | return; | |
238 | a->debugfs_dir = d; | |
239 | ||
240 | debugfs_create_x64("size", S_IRUGO, d, &a->size); | |
241 | debugfs_create_x64("external_lba_start", S_IRUGO, d, | |
242 | &a->external_lba_start); | |
243 | debugfs_create_x32("internal_nlba", S_IRUGO, d, &a->internal_nlba); | |
244 | debugfs_create_u32("internal_lbasize", S_IRUGO, d, | |
245 | &a->internal_lbasize); | |
246 | debugfs_create_x32("external_nlba", S_IRUGO, d, &a->external_nlba); | |
247 | debugfs_create_u32("external_lbasize", S_IRUGO, d, | |
248 | &a->external_lbasize); | |
249 | debugfs_create_u32("nfree", S_IRUGO, d, &a->nfree); | |
250 | debugfs_create_u16("version_major", S_IRUGO, d, &a->version_major); | |
251 | debugfs_create_u16("version_minor", S_IRUGO, d, &a->version_minor); | |
252 | debugfs_create_x64("nextoff", S_IRUGO, d, &a->nextoff); | |
253 | debugfs_create_x64("infooff", S_IRUGO, d, &a->infooff); | |
254 | debugfs_create_x64("dataoff", S_IRUGO, d, &a->dataoff); | |
255 | debugfs_create_x64("mapoff", S_IRUGO, d, &a->mapoff); | |
256 | debugfs_create_x64("logoff", S_IRUGO, d, &a->logoff); | |
257 | debugfs_create_x64("info2off", S_IRUGO, d, &a->info2off); | |
258 | debugfs_create_x32("flags", S_IRUGO, d, &a->flags); | |
24e3a7fb VV |
259 | debugfs_create_u32("log_index_0", S_IRUGO, d, &a->log_index[0]); |
260 | debugfs_create_u32("log_index_1", S_IRUGO, d, &a->log_index[1]); | |
5212e11f VV |
261 | } |
262 | ||
263 | static void btt_debugfs_init(struct btt *btt) | |
264 | { | |
265 | int i = 0; | |
266 | struct arena_info *arena; | |
267 | ||
268 | btt->debugfs_dir = debugfs_create_dir(dev_name(&btt->nd_btt->dev), | |
269 | debugfs_root); | |
270 | if (IS_ERR_OR_NULL(btt->debugfs_dir)) | |
271 | return; | |
272 | ||
273 | list_for_each_entry(arena, &btt->arena_list, list) { | |
274 | arena_debugfs_init(arena, btt->debugfs_dir, i); | |
275 | i++; | |
276 | } | |
277 | } | |
278 | ||
24e3a7fb VV |
279 | static u32 log_seq(struct log_group *log, int log_idx) |
280 | { | |
281 | return le32_to_cpu(log->ent[log_idx].seq); | |
282 | } | |
283 | ||
5212e11f VV |
284 | /* |
285 | * This function accepts two log entries, and uses the | |
286 | * sequence number to find the 'older' entry. | |
287 | * It also updates the sequence number in this old entry to | |
288 | * make it the 'new' one if the mark_flag is set. | |
289 | * Finally, it returns which of the entries was the older one. | |
290 | * | |
291 | * TODO The logic feels a bit kludge-y. make it better.. | |
292 | */ | |
24e3a7fb | 293 | static int btt_log_get_old(struct arena_info *a, struct log_group *log) |
5212e11f | 294 | { |
24e3a7fb VV |
295 | int idx0 = a->log_index[0]; |
296 | int idx1 = a->log_index[1]; | |
5212e11f VV |
297 | int old; |
298 | ||
299 | /* | |
300 | * the first ever time this is seen, the entry goes into [0] | |
301 | * the next time, the following logic works out to put this | |
302 | * (next) entry into [1] | |
303 | */ | |
24e3a7fb VV |
304 | if (log_seq(log, idx0) == 0) { |
305 | log->ent[idx0].seq = cpu_to_le32(1); | |
5212e11f VV |
306 | return 0; |
307 | } | |
308 | ||
24e3a7fb | 309 | if (log_seq(log, idx0) == log_seq(log, idx1)) |
5212e11f | 310 | return -EINVAL; |
24e3a7fb | 311 | if (log_seq(log, idx0) + log_seq(log, idx1) > 5) |
5212e11f VV |
312 | return -EINVAL; |
313 | ||
24e3a7fb VV |
314 | if (log_seq(log, idx0) < log_seq(log, idx1)) { |
315 | if ((log_seq(log, idx1) - log_seq(log, idx0)) == 1) | |
5212e11f VV |
316 | old = 0; |
317 | else | |
318 | old = 1; | |
319 | } else { | |
24e3a7fb | 320 | if ((log_seq(log, idx0) - log_seq(log, idx1)) == 1) |
5212e11f VV |
321 | old = 1; |
322 | else | |
323 | old = 0; | |
324 | } | |
325 | ||
326 | return old; | |
327 | } | |
328 | ||
5212e11f VV |
329 | /* |
330 | * This function copies the desired (old/new) log entry into ent if | |
331 | * it is not NULL. It returns the sub-slot number (0 or 1) | |
332 | * where the desired log entry was found. Negative return values | |
333 | * indicate errors. | |
334 | */ | |
335 | static int btt_log_read(struct arena_info *arena, u32 lane, | |
336 | struct log_entry *ent, int old_flag) | |
337 | { | |
338 | int ret; | |
339 | int old_ent, ret_ent; | |
24e3a7fb | 340 | struct log_group log; |
5212e11f | 341 | |
24e3a7fb | 342 | ret = btt_log_group_read(arena, lane, &log); |
5212e11f VV |
343 | if (ret) |
344 | return -EIO; | |
345 | ||
24e3a7fb | 346 | old_ent = btt_log_get_old(arena, &log); |
5212e11f | 347 | if (old_ent < 0 || old_ent > 1) { |
e6be2dcb | 348 | dev_err(to_dev(arena), |
5212e11f | 349 | "log corruption (%d): lane %d seq [%d, %d]\n", |
24e3a7fb VV |
350 | old_ent, lane, log.ent[arena->log_index[0]].seq, |
351 | log.ent[arena->log_index[1]].seq); | |
5212e11f VV |
352 | /* TODO set error state? */ |
353 | return -EIO; | |
354 | } | |
355 | ||
356 | ret_ent = (old_flag ? old_ent : (1 - old_ent)); | |
357 | ||
358 | if (ent != NULL) | |
24e3a7fb | 359 | memcpy(ent, &log.ent[arena->log_index[ret_ent]], LOG_ENT_SIZE); |
5212e11f VV |
360 | |
361 | return ret_ent; | |
362 | } | |
363 | ||
364 | /* | |
365 | * This function commits a log entry to media | |
366 | * It does _not_ prepare the freelist entry for the next write | |
367 | * btt_flog_write is the wrapper for updating the freelist elements | |
368 | */ | |
369 | static int __btt_log_write(struct arena_info *arena, u32 lane, | |
3ae3d67b | 370 | u32 sub, struct log_entry *ent, unsigned long flags) |
5212e11f VV |
371 | { |
372 | int ret; | |
24e3a7fb VV |
373 | u32 group_slot = arena->log_index[sub]; |
374 | unsigned int log_half = LOG_ENT_SIZE / 2; | |
5212e11f | 375 | void *src = ent; |
24e3a7fb | 376 | u64 ns_off; |
5212e11f | 377 | |
24e3a7fb VV |
378 | ns_off = arena->logoff + (lane * LOG_GRP_SIZE) + |
379 | (group_slot * LOG_ENT_SIZE); | |
5212e11f | 380 | /* split the 16B write into atomic, durable halves */ |
3ae3d67b | 381 | ret = arena_write_bytes(arena, ns_off, src, log_half, flags); |
5212e11f VV |
382 | if (ret) |
383 | return ret; | |
384 | ||
385 | ns_off += log_half; | |
386 | src += log_half; | |
3ae3d67b | 387 | return arena_write_bytes(arena, ns_off, src, log_half, flags); |
5212e11f VV |
388 | } |
389 | ||
390 | static int btt_flog_write(struct arena_info *arena, u32 lane, u32 sub, | |
391 | struct log_entry *ent) | |
392 | { | |
393 | int ret; | |
394 | ||
3ae3d67b | 395 | ret = __btt_log_write(arena, lane, sub, ent, NVDIMM_IO_ATOMIC); |
5212e11f VV |
396 | if (ret) |
397 | return ret; | |
398 | ||
399 | /* prepare the next free entry */ | |
400 | arena->freelist[lane].sub = 1 - arena->freelist[lane].sub; | |
401 | if (++(arena->freelist[lane].seq) == 4) | |
402 | arena->freelist[lane].seq = 1; | |
d9b83c75 VV |
403 | if (ent_e_flag(ent->old_map)) |
404 | arena->freelist[lane].has_err = 1; | |
405 | arena->freelist[lane].block = le32_to_cpu(ent_lba(ent->old_map)); | |
5212e11f VV |
406 | |
407 | return ret; | |
408 | } | |
409 | ||
410 | /* | |
411 | * This function initializes the BTT map to the initial state, which is | |
412 | * all-zeroes, and indicates an identity mapping | |
413 | */ | |
414 | static int btt_map_init(struct arena_info *arena) | |
415 | { | |
416 | int ret = -EINVAL; | |
417 | void *zerobuf; | |
418 | size_t offset = 0; | |
419 | size_t chunk_size = SZ_2M; | |
420 | size_t mapsize = arena->logoff - arena->mapoff; | |
421 | ||
422 | zerobuf = kzalloc(chunk_size, GFP_KERNEL); | |
423 | if (!zerobuf) | |
424 | return -ENOMEM; | |
425 | ||
b177fe85 VV |
426 | /* |
427 | * mapoff should always be at least 512B aligned. We rely on that to | |
428 | * make sure rw_bytes does error clearing correctly, so make sure that | |
429 | * is the case. | |
430 | */ | |
86652d2e VV |
431 | dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->mapoff, 512), |
432 | "arena->mapoff: %#llx is unaligned\n", arena->mapoff); | |
b177fe85 | 433 | |
5212e11f VV |
434 | while (mapsize) { |
435 | size_t size = min(mapsize, chunk_size); | |
436 | ||
86652d2e | 437 | dev_WARN_ONCE(to_dev(arena), size < 512, |
04c3c982 | 438 | "chunk size: %#zx is unaligned\n", size); |
5212e11f | 439 | ret = arena_write_bytes(arena, arena->mapoff + offset, zerobuf, |
3ae3d67b | 440 | size, 0); |
5212e11f VV |
441 | if (ret) |
442 | goto free; | |
443 | ||
444 | offset += size; | |
445 | mapsize -= size; | |
446 | cond_resched(); | |
447 | } | |
448 | ||
449 | free: | |
450 | kfree(zerobuf); | |
451 | return ret; | |
452 | } | |
453 | ||
454 | /* | |
455 | * This function initializes the BTT log with 'fake' entries pointing | |
456 | * to the initial reserved set of blocks as being free | |
457 | */ | |
458 | static int btt_log_init(struct arena_info *arena) | |
459 | { | |
b177fe85 VV |
460 | size_t logsize = arena->info2off - arena->logoff; |
461 | size_t chunk_size = SZ_4K, offset = 0; | |
24e3a7fb | 462 | struct log_entry ent; |
b177fe85 | 463 | void *zerobuf; |
5212e11f VV |
464 | int ret; |
465 | u32 i; | |
5212e11f | 466 | |
b177fe85 VV |
467 | zerobuf = kzalloc(chunk_size, GFP_KERNEL); |
468 | if (!zerobuf) | |
469 | return -ENOMEM; | |
470 | /* | |
471 | * logoff should always be at least 512B aligned. We rely on that to | |
472 | * make sure rw_bytes does error clearing correctly, so make sure that | |
473 | * is the case. | |
474 | */ | |
86652d2e VV |
475 | dev_WARN_ONCE(to_dev(arena), !IS_ALIGNED(arena->logoff, 512), |
476 | "arena->logoff: %#llx is unaligned\n", arena->logoff); | |
b177fe85 VV |
477 | |
478 | while (logsize) { | |
479 | size_t size = min(logsize, chunk_size); | |
480 | ||
86652d2e | 481 | dev_WARN_ONCE(to_dev(arena), size < 512, |
04c3c982 | 482 | "chunk size: %#zx is unaligned\n", size); |
b177fe85 VV |
483 | ret = arena_write_bytes(arena, arena->logoff + offset, zerobuf, |
484 | size, 0); | |
485 | if (ret) | |
486 | goto free; | |
487 | ||
488 | offset += size; | |
489 | logsize -= size; | |
490 | cond_resched(); | |
491 | } | |
5212e11f VV |
492 | |
493 | for (i = 0; i < arena->nfree; i++) { | |
24e3a7fb VV |
494 | ent.lba = cpu_to_le32(i); |
495 | ent.old_map = cpu_to_le32(arena->external_nlba + i); | |
496 | ent.new_map = cpu_to_le32(arena->external_nlba + i); | |
497 | ent.seq = cpu_to_le32(LOG_SEQ_INIT); | |
498 | ret = __btt_log_write(arena, i, 0, &ent, 0); | |
5212e11f | 499 | if (ret) |
b177fe85 | 500 | goto free; |
5212e11f VV |
501 | } |
502 | ||
b177fe85 VV |
503 | free: |
504 | kfree(zerobuf); | |
505 | return ret; | |
5212e11f VV |
506 | } |
507 | ||
d9b83c75 VV |
508 | static u64 to_namespace_offset(struct arena_info *arena, u64 lba) |
509 | { | |
510 | return arena->dataoff + ((u64)lba * arena->internal_lbasize); | |
511 | } | |
512 | ||
513 | static int arena_clear_freelist_error(struct arena_info *arena, u32 lane) | |
514 | { | |
515 | int ret = 0; | |
516 | ||
517 | if (arena->freelist[lane].has_err) { | |
518 | void *zero_page = page_address(ZERO_PAGE(0)); | |
519 | u32 lba = arena->freelist[lane].block; | |
520 | u64 nsoff = to_namespace_offset(arena, lba); | |
521 | unsigned long len = arena->sector_size; | |
522 | ||
523 | mutex_lock(&arena->err_lock); | |
524 | ||
525 | while (len) { | |
526 | unsigned long chunk = min(len, PAGE_SIZE); | |
527 | ||
528 | ret = arena_write_bytes(arena, nsoff, zero_page, | |
529 | chunk, 0); | |
530 | if (ret) | |
531 | break; | |
532 | len -= chunk; | |
533 | nsoff += chunk; | |
534 | if (len == 0) | |
535 | arena->freelist[lane].has_err = 0; | |
536 | } | |
537 | mutex_unlock(&arena->err_lock); | |
538 | } | |
539 | return ret; | |
540 | } | |
541 | ||
5212e11f VV |
542 | static int btt_freelist_init(struct arena_info *arena) |
543 | { | |
2f8c9011 | 544 | int new, ret; |
2f8c9011 | 545 | struct log_entry log_new; |
9dedc73a | 546 | u32 i, map_entry, log_oldmap, log_newmap; |
5212e11f VV |
547 | |
548 | arena->freelist = kcalloc(arena->nfree, sizeof(struct free_entry), | |
549 | GFP_KERNEL); | |
550 | if (!arena->freelist) | |
551 | return -ENOMEM; | |
552 | ||
553 | for (i = 0; i < arena->nfree; i++) { | |
5212e11f VV |
554 | new = btt_log_read(arena, i, &log_new, LOG_NEW_ENT); |
555 | if (new < 0) | |
556 | return new; | |
557 | ||
9dedc73a VV |
558 | /* old and new map entries with any flags stripped out */ |
559 | log_oldmap = ent_lba(le32_to_cpu(log_new.old_map)); | |
560 | log_newmap = ent_lba(le32_to_cpu(log_new.new_map)); | |
561 | ||
5212e11f VV |
562 | /* sub points to the next one to be overwritten */ |
563 | arena->freelist[i].sub = 1 - new; | |
564 | arena->freelist[i].seq = nd_inc_seq(le32_to_cpu(log_new.seq)); | |
9dedc73a | 565 | arena->freelist[i].block = log_oldmap; |
5212e11f | 566 | |
d9b83c75 VV |
567 | /* |
568 | * FIXME: if error clearing fails during init, we want to make | |
569 | * the BTT read-only | |
570 | */ | |
9dedc73a VV |
571 | if (ent_e_flag(log_new.old_map) && |
572 | !ent_normal(log_new.old_map)) { | |
573 | arena->freelist[i].has_err = 1; | |
d9b83c75 VV |
574 | ret = arena_clear_freelist_error(arena, i); |
575 | if (ret) | |
86652d2e VV |
576 | dev_err_ratelimited(to_dev(arena), |
577 | "Unable to clear known errors\n"); | |
d9b83c75 VV |
578 | } |
579 | ||
5212e11f | 580 | /* This implies a newly created or untouched flog entry */ |
9dedc73a | 581 | if (log_oldmap == log_newmap) |
5212e11f VV |
582 | continue; |
583 | ||
584 | /* Check if map recovery is needed */ | |
585 | ret = btt_map_read(arena, le32_to_cpu(log_new.lba), &map_entry, | |
3ae3d67b | 586 | NULL, NULL, 0); |
5212e11f VV |
587 | if (ret) |
588 | return ret; | |
9dedc73a VV |
589 | |
590 | /* | |
591 | * The map_entry from btt_read_map is stripped of any flag bits, | |
592 | * so use the stripped out versions from the log as well for | |
593 | * testing whether recovery is needed. For restoration, use the | |
594 | * 'raw' version of the log entries as that captured what we | |
595 | * were going to write originally. | |
596 | */ | |
597 | if ((log_newmap != map_entry) && (log_oldmap == map_entry)) { | |
5212e11f VV |
598 | /* |
599 | * Last transaction wrote the flog, but wasn't able | |
600 | * to complete the map write. So fix up the map. | |
601 | */ | |
602 | ret = btt_map_write(arena, le32_to_cpu(log_new.lba), | |
3ae3d67b | 603 | le32_to_cpu(log_new.new_map), 0, 0, 0); |
5212e11f VV |
604 | if (ret) |
605 | return ret; | |
606 | } | |
5212e11f VV |
607 | } |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
24e3a7fb VV |
612 | static bool ent_is_padding(struct log_entry *ent) |
613 | { | |
614 | return (ent->lba == 0) && (ent->old_map == 0) && (ent->new_map == 0) | |
615 | && (ent->seq == 0); | |
616 | } | |
617 | ||
618 | /* | |
619 | * Detecting valid log indices: We read a log group (see the comments in btt.h | |
620 | * for a description of a 'log_group' and its 'slots'), and iterate over its | |
621 | * four slots. We expect that a padding slot will be all-zeroes, and use this | |
622 | * to detect a padding slot vs. an actual entry. | |
623 | * | |
624 | * If a log_group is in the initial state, i.e. hasn't been used since the | |
625 | * creation of this BTT layout, it will have three of the four slots with | |
626 | * zeroes. We skip over these log_groups for the detection of log_index. If | |
627 | * all log_groups are in the initial state (i.e. the BTT has never been | |
628 | * written to), it is safe to assume the 'new format' of log entries in slots | |
629 | * (0, 1). | |
630 | */ | |
631 | static int log_set_indices(struct arena_info *arena) | |
632 | { | |
633 | bool idx_set = false, initial_state = true; | |
634 | int ret, log_index[2] = {-1, -1}; | |
635 | u32 i, j, next_idx = 0; | |
636 | struct log_group log; | |
637 | u32 pad_count = 0; | |
638 | ||
639 | for (i = 0; i < arena->nfree; i++) { | |
640 | ret = btt_log_group_read(arena, i, &log); | |
641 | if (ret < 0) | |
642 | return ret; | |
643 | ||
644 | for (j = 0; j < 4; j++) { | |
645 | if (!idx_set) { | |
646 | if (ent_is_padding(&log.ent[j])) { | |
647 | pad_count++; | |
648 | continue; | |
649 | } else { | |
650 | /* Skip if index has been recorded */ | |
651 | if ((next_idx == 1) && | |
652 | (j == log_index[0])) | |
653 | continue; | |
654 | /* valid entry, record index */ | |
655 | log_index[next_idx] = j; | |
656 | next_idx++; | |
657 | } | |
658 | if (next_idx == 2) { | |
659 | /* two valid entries found */ | |
660 | idx_set = true; | |
661 | } else if (next_idx > 2) { | |
662 | /* too many valid indices */ | |
663 | return -ENXIO; | |
664 | } | |
665 | } else { | |
666 | /* | |
667 | * once the indices have been set, just verify | |
668 | * that all subsequent log groups are either in | |
669 | * their initial state or follow the same | |
670 | * indices. | |
671 | */ | |
672 | if (j == log_index[0]) { | |
673 | /* entry must be 'valid' */ | |
674 | if (ent_is_padding(&log.ent[j])) | |
675 | return -ENXIO; | |
676 | } else if (j == log_index[1]) { | |
677 | ; | |
678 | /* | |
679 | * log_index[1] can be padding if the | |
680 | * lane never got used and it is still | |
681 | * in the initial state (three 'padding' | |
682 | * entries) | |
683 | */ | |
684 | } else { | |
685 | /* entry must be invalid (padding) */ | |
686 | if (!ent_is_padding(&log.ent[j])) | |
687 | return -ENXIO; | |
688 | } | |
689 | } | |
690 | } | |
691 | /* | |
692 | * If any of the log_groups have more than one valid, | |
693 | * non-padding entry, then the we are no longer in the | |
694 | * initial_state | |
695 | */ | |
696 | if (pad_count < 3) | |
697 | initial_state = false; | |
698 | pad_count = 0; | |
699 | } | |
700 | ||
701 | if (!initial_state && !idx_set) | |
702 | return -ENXIO; | |
703 | ||
704 | /* | |
705 | * If all the entries in the log were in the initial state, | |
706 | * assume new padding scheme | |
707 | */ | |
708 | if (initial_state) | |
709 | log_index[1] = 1; | |
710 | ||
711 | /* | |
712 | * Only allow the known permutations of log/padding indices, | |
713 | * i.e. (0, 1), and (0, 2) | |
714 | */ | |
715 | if ((log_index[0] == 0) && ((log_index[1] == 1) || (log_index[1] == 2))) | |
716 | ; /* known index possibilities */ | |
717 | else { | |
718 | dev_err(to_dev(arena), "Found an unknown padding scheme\n"); | |
719 | return -ENXIO; | |
720 | } | |
721 | ||
722 | arena->log_index[0] = log_index[0]; | |
723 | arena->log_index[1] = log_index[1]; | |
724 | dev_dbg(to_dev(arena), "log_index_0 = %d\n", log_index[0]); | |
725 | dev_dbg(to_dev(arena), "log_index_1 = %d\n", log_index[1]); | |
726 | return 0; | |
727 | } | |
728 | ||
5212e11f VV |
729 | static int btt_rtt_init(struct arena_info *arena) |
730 | { | |
731 | arena->rtt = kcalloc(arena->nfree, sizeof(u32), GFP_KERNEL); | |
732 | if (arena->rtt == NULL) | |
733 | return -ENOMEM; | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | static int btt_maplocks_init(struct arena_info *arena) | |
739 | { | |
740 | u32 i; | |
741 | ||
742 | arena->map_locks = kcalloc(arena->nfree, sizeof(struct aligned_lock), | |
743 | GFP_KERNEL); | |
744 | if (!arena->map_locks) | |
745 | return -ENOMEM; | |
746 | ||
747 | for (i = 0; i < arena->nfree; i++) | |
748 | spin_lock_init(&arena->map_locks[i].lock); | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
753 | static struct arena_info *alloc_arena(struct btt *btt, size_t size, | |
754 | size_t start, size_t arena_off) | |
755 | { | |
756 | struct arena_info *arena; | |
757 | u64 logsize, mapsize, datasize; | |
758 | u64 available = size; | |
759 | ||
760 | arena = kzalloc(sizeof(struct arena_info), GFP_KERNEL); | |
761 | if (!arena) | |
762 | return NULL; | |
763 | arena->nd_btt = btt->nd_btt; | |
75892004 | 764 | arena->sector_size = btt->sector_size; |
d08cd5e0 | 765 | mutex_init(&arena->err_lock); |
5212e11f VV |
766 | |
767 | if (!size) | |
768 | return arena; | |
769 | ||
770 | arena->size = size; | |
771 | arena->external_lba_start = start; | |
772 | arena->external_lbasize = btt->lbasize; | |
773 | arena->internal_lbasize = roundup(arena->external_lbasize, | |
774 | INT_LBASIZE_ALIGNMENT); | |
775 | arena->nfree = BTT_DEFAULT_NFREE; | |
14e49454 VV |
776 | arena->version_major = btt->nd_btt->version_major; |
777 | arena->version_minor = btt->nd_btt->version_minor; | |
5212e11f VV |
778 | |
779 | if (available % BTT_PG_SIZE) | |
780 | available -= (available % BTT_PG_SIZE); | |
781 | ||
782 | /* Two pages are reserved for the super block and its copy */ | |
783 | available -= 2 * BTT_PG_SIZE; | |
784 | ||
785 | /* The log takes a fixed amount of space based on nfree */ | |
24e3a7fb | 786 | logsize = roundup(arena->nfree * LOG_GRP_SIZE, BTT_PG_SIZE); |
5212e11f VV |
787 | available -= logsize; |
788 | ||
789 | /* Calculate optimal split between map and data area */ | |
790 | arena->internal_nlba = div_u64(available - BTT_PG_SIZE, | |
791 | arena->internal_lbasize + MAP_ENT_SIZE); | |
792 | arena->external_nlba = arena->internal_nlba - arena->nfree; | |
793 | ||
794 | mapsize = roundup((arena->external_nlba * MAP_ENT_SIZE), BTT_PG_SIZE); | |
795 | datasize = available - mapsize; | |
796 | ||
797 | /* 'Absolute' values, relative to start of storage space */ | |
798 | arena->infooff = arena_off; | |
799 | arena->dataoff = arena->infooff + BTT_PG_SIZE; | |
800 | arena->mapoff = arena->dataoff + datasize; | |
801 | arena->logoff = arena->mapoff + mapsize; | |
802 | arena->info2off = arena->logoff + logsize; | |
24e3a7fb VV |
803 | |
804 | /* Default log indices are (0,1) */ | |
805 | arena->log_index[0] = 0; | |
806 | arena->log_index[1] = 1; | |
5212e11f VV |
807 | return arena; |
808 | } | |
809 | ||
810 | static void free_arenas(struct btt *btt) | |
811 | { | |
812 | struct arena_info *arena, *next; | |
813 | ||
814 | list_for_each_entry_safe(arena, next, &btt->arena_list, list) { | |
815 | list_del(&arena->list); | |
816 | kfree(arena->rtt); | |
817 | kfree(arena->map_locks); | |
818 | kfree(arena->freelist); | |
819 | debugfs_remove_recursive(arena->debugfs_dir); | |
820 | kfree(arena); | |
821 | } | |
822 | } | |
823 | ||
5212e11f VV |
824 | /* |
825 | * This function reads an existing valid btt superblock and | |
826 | * populates the corresponding arena_info struct | |
827 | */ | |
828 | static void parse_arena_meta(struct arena_info *arena, struct btt_sb *super, | |
829 | u64 arena_off) | |
830 | { | |
831 | arena->internal_nlba = le32_to_cpu(super->internal_nlba); | |
832 | arena->internal_lbasize = le32_to_cpu(super->internal_lbasize); | |
833 | arena->external_nlba = le32_to_cpu(super->external_nlba); | |
834 | arena->external_lbasize = le32_to_cpu(super->external_lbasize); | |
835 | arena->nfree = le32_to_cpu(super->nfree); | |
836 | arena->version_major = le16_to_cpu(super->version_major); | |
837 | arena->version_minor = le16_to_cpu(super->version_minor); | |
838 | ||
839 | arena->nextoff = (super->nextoff == 0) ? 0 : (arena_off + | |
840 | le64_to_cpu(super->nextoff)); | |
841 | arena->infooff = arena_off; | |
842 | arena->dataoff = arena_off + le64_to_cpu(super->dataoff); | |
843 | arena->mapoff = arena_off + le64_to_cpu(super->mapoff); | |
844 | arena->logoff = arena_off + le64_to_cpu(super->logoff); | |
845 | arena->info2off = arena_off + le64_to_cpu(super->info2off); | |
846 | ||
5e329406 DW |
847 | arena->size = (le64_to_cpu(super->nextoff) > 0) |
848 | ? (le64_to_cpu(super->nextoff)) | |
849 | : (arena->info2off - arena->infooff + BTT_PG_SIZE); | |
5212e11f VV |
850 | |
851 | arena->flags = le32_to_cpu(super->flags); | |
852 | } | |
853 | ||
854 | static int discover_arenas(struct btt *btt) | |
855 | { | |
856 | int ret = 0; | |
857 | struct arena_info *arena; | |
858 | struct btt_sb *super; | |
859 | size_t remaining = btt->rawsize; | |
860 | u64 cur_nlba = 0; | |
861 | size_t cur_off = 0; | |
862 | int num_arenas = 0; | |
863 | ||
864 | super = kzalloc(sizeof(*super), GFP_KERNEL); | |
865 | if (!super) | |
866 | return -ENOMEM; | |
867 | ||
868 | while (remaining) { | |
869 | /* Alloc memory for arena */ | |
870 | arena = alloc_arena(btt, 0, 0, 0); | |
871 | if (!arena) { | |
872 | ret = -ENOMEM; | |
873 | goto out_super; | |
874 | } | |
875 | ||
876 | arena->infooff = cur_off; | |
877 | ret = btt_info_read(arena, super); | |
878 | if (ret) | |
879 | goto out; | |
880 | ||
ab45e763 | 881 | if (!nd_btt_arena_is_valid(btt->nd_btt, super)) { |
5212e11f VV |
882 | if (remaining == btt->rawsize) { |
883 | btt->init_state = INIT_NOTFOUND; | |
884 | dev_info(to_dev(arena), "No existing arenas\n"); | |
885 | goto out; | |
886 | } else { | |
e6be2dcb | 887 | dev_err(to_dev(arena), |
5212e11f VV |
888 | "Found corrupted metadata!\n"); |
889 | ret = -ENODEV; | |
890 | goto out; | |
891 | } | |
892 | } | |
893 | ||
894 | arena->external_lba_start = cur_nlba; | |
895 | parse_arena_meta(arena, super, cur_off); | |
896 | ||
24e3a7fb VV |
897 | ret = log_set_indices(arena); |
898 | if (ret) { | |
899 | dev_err(to_dev(arena), | |
900 | "Unable to deduce log/padding indices\n"); | |
901 | goto out; | |
902 | } | |
903 | ||
5212e11f VV |
904 | ret = btt_freelist_init(arena); |
905 | if (ret) | |
906 | goto out; | |
907 | ||
908 | ret = btt_rtt_init(arena); | |
909 | if (ret) | |
910 | goto out; | |
911 | ||
912 | ret = btt_maplocks_init(arena); | |
913 | if (ret) | |
914 | goto out; | |
915 | ||
916 | list_add_tail(&arena->list, &btt->arena_list); | |
917 | ||
918 | remaining -= arena->size; | |
919 | cur_off += arena->size; | |
920 | cur_nlba += arena->external_nlba; | |
921 | num_arenas++; | |
922 | ||
923 | if (arena->nextoff == 0) | |
924 | break; | |
925 | } | |
926 | btt->num_arenas = num_arenas; | |
927 | btt->nlba = cur_nlba; | |
928 | btt->init_state = INIT_READY; | |
929 | ||
930 | kfree(super); | |
931 | return ret; | |
932 | ||
933 | out: | |
934 | kfree(arena); | |
935 | free_arenas(btt); | |
936 | out_super: | |
937 | kfree(super); | |
938 | return ret; | |
939 | } | |
940 | ||
941 | static int create_arenas(struct btt *btt) | |
942 | { | |
943 | size_t remaining = btt->rawsize; | |
944 | size_t cur_off = 0; | |
945 | ||
946 | while (remaining) { | |
947 | struct arena_info *arena; | |
948 | size_t arena_size = min_t(u64, ARENA_MAX_SIZE, remaining); | |
949 | ||
950 | remaining -= arena_size; | |
951 | if (arena_size < ARENA_MIN_SIZE) | |
952 | break; | |
953 | ||
954 | arena = alloc_arena(btt, arena_size, btt->nlba, cur_off); | |
955 | if (!arena) { | |
956 | free_arenas(btt); | |
957 | return -ENOMEM; | |
958 | } | |
959 | btt->nlba += arena->external_nlba; | |
960 | if (remaining >= ARENA_MIN_SIZE) | |
961 | arena->nextoff = arena->size; | |
962 | else | |
963 | arena->nextoff = 0; | |
964 | cur_off += arena_size; | |
965 | list_add_tail(&arena->list, &btt->arena_list); | |
966 | } | |
967 | ||
968 | return 0; | |
969 | } | |
970 | ||
971 | /* | |
972 | * This function completes arena initialization by writing | |
973 | * all the metadata. | |
974 | * It is only called for an uninitialized arena when a write | |
975 | * to that arena occurs for the first time. | |
976 | */ | |
fbde1414 | 977 | static int btt_arena_write_layout(struct arena_info *arena) |
5212e11f VV |
978 | { |
979 | int ret; | |
e1455744 | 980 | u64 sum; |
5212e11f | 981 | struct btt_sb *super; |
fbde1414 | 982 | struct nd_btt *nd_btt = arena->nd_btt; |
6ec68954 | 983 | const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev); |
5212e11f VV |
984 | |
985 | ret = btt_map_init(arena); | |
986 | if (ret) | |
987 | return ret; | |
988 | ||
989 | ret = btt_log_init(arena); | |
990 | if (ret) | |
991 | return ret; | |
992 | ||
993 | super = kzalloc(sizeof(struct btt_sb), GFP_NOIO); | |
994 | if (!super) | |
995 | return -ENOMEM; | |
996 | ||
997 | strncpy(super->signature, BTT_SIG, BTT_SIG_LEN); | |
fbde1414 | 998 | memcpy(super->uuid, nd_btt->uuid, 16); |
6ec68954 | 999 | memcpy(super->parent_uuid, parent_uuid, 16); |
5212e11f VV |
1000 | super->flags = cpu_to_le32(arena->flags); |
1001 | super->version_major = cpu_to_le16(arena->version_major); | |
1002 | super->version_minor = cpu_to_le16(arena->version_minor); | |
1003 | super->external_lbasize = cpu_to_le32(arena->external_lbasize); | |
1004 | super->external_nlba = cpu_to_le32(arena->external_nlba); | |
1005 | super->internal_lbasize = cpu_to_le32(arena->internal_lbasize); | |
1006 | super->internal_nlba = cpu_to_le32(arena->internal_nlba); | |
1007 | super->nfree = cpu_to_le32(arena->nfree); | |
1008 | super->infosize = cpu_to_le32(sizeof(struct btt_sb)); | |
1009 | super->nextoff = cpu_to_le64(arena->nextoff); | |
1010 | /* | |
1011 | * Subtract arena->infooff (arena start) so numbers are relative | |
1012 | * to 'this' arena | |
1013 | */ | |
1014 | super->dataoff = cpu_to_le64(arena->dataoff - arena->infooff); | |
1015 | super->mapoff = cpu_to_le64(arena->mapoff - arena->infooff); | |
1016 | super->logoff = cpu_to_le64(arena->logoff - arena->infooff); | |
1017 | super->info2off = cpu_to_le64(arena->info2off - arena->infooff); | |
1018 | ||
1019 | super->flags = 0; | |
e1455744 DW |
1020 | sum = nd_sb_checksum((struct nd_gen_sb *) super); |
1021 | super->checksum = cpu_to_le64(sum); | |
5212e11f VV |
1022 | |
1023 | ret = btt_info_write(arena, super); | |
1024 | ||
1025 | kfree(super); | |
1026 | return ret; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * This function completes the initialization for the BTT namespace | |
1031 | * such that it is ready to accept IOs | |
1032 | */ | |
1033 | static int btt_meta_init(struct btt *btt) | |
1034 | { | |
1035 | int ret = 0; | |
1036 | struct arena_info *arena; | |
1037 | ||
1038 | mutex_lock(&btt->init_lock); | |
1039 | list_for_each_entry(arena, &btt->arena_list, list) { | |
fbde1414 | 1040 | ret = btt_arena_write_layout(arena); |
5212e11f VV |
1041 | if (ret) |
1042 | goto unlock; | |
1043 | ||
1044 | ret = btt_freelist_init(arena); | |
1045 | if (ret) | |
1046 | goto unlock; | |
1047 | ||
1048 | ret = btt_rtt_init(arena); | |
1049 | if (ret) | |
1050 | goto unlock; | |
1051 | ||
1052 | ret = btt_maplocks_init(arena); | |
1053 | if (ret) | |
1054 | goto unlock; | |
1055 | } | |
1056 | ||
1057 | btt->init_state = INIT_READY; | |
1058 | ||
1059 | unlock: | |
1060 | mutex_unlock(&btt->init_lock); | |
1061 | return ret; | |
1062 | } | |
1063 | ||
41cd8b70 VV |
1064 | static u32 btt_meta_size(struct btt *btt) |
1065 | { | |
1066 | return btt->lbasize - btt->sector_size; | |
1067 | } | |
1068 | ||
5212e11f VV |
1069 | /* |
1070 | * This function calculates the arena in which the given LBA lies | |
1071 | * by doing a linear walk. This is acceptable since we expect only | |
1072 | * a few arenas. If we have backing devices that get much larger, | |
1073 | * we can construct a balanced binary tree of arenas at init time | |
1074 | * so that this range search becomes faster. | |
1075 | */ | |
1076 | static int lba_to_arena(struct btt *btt, sector_t sector, __u32 *premap, | |
1077 | struct arena_info **arena) | |
1078 | { | |
1079 | struct arena_info *arena_list; | |
1080 | __u64 lba = div_u64(sector << SECTOR_SHIFT, btt->sector_size); | |
1081 | ||
1082 | list_for_each_entry(arena_list, &btt->arena_list, list) { | |
1083 | if (lba < arena_list->external_nlba) { | |
1084 | *arena = arena_list; | |
1085 | *premap = lba; | |
1086 | return 0; | |
1087 | } | |
1088 | lba -= arena_list->external_nlba; | |
1089 | } | |
1090 | ||
1091 | return -EIO; | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * The following (lock_map, unlock_map) are mostly just to improve | |
1096 | * readability, since they index into an array of locks | |
1097 | */ | |
1098 | static void lock_map(struct arena_info *arena, u32 premap) | |
1099 | __acquires(&arena->map_locks[idx].lock) | |
1100 | { | |
1101 | u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree; | |
1102 | ||
1103 | spin_lock(&arena->map_locks[idx].lock); | |
1104 | } | |
1105 | ||
1106 | static void unlock_map(struct arena_info *arena, u32 premap) | |
1107 | __releases(&arena->map_locks[idx].lock) | |
1108 | { | |
1109 | u32 idx = (premap * MAP_ENT_SIZE / L1_CACHE_BYTES) % arena->nfree; | |
1110 | ||
1111 | spin_unlock(&arena->map_locks[idx].lock); | |
1112 | } | |
1113 | ||
5212e11f VV |
1114 | static int btt_data_read(struct arena_info *arena, struct page *page, |
1115 | unsigned int off, u32 lba, u32 len) | |
1116 | { | |
1117 | int ret; | |
1118 | u64 nsoff = to_namespace_offset(arena, lba); | |
1119 | void *mem = kmap_atomic(page); | |
1120 | ||
3ae3d67b | 1121 | ret = arena_read_bytes(arena, nsoff, mem + off, len, NVDIMM_IO_ATOMIC); |
5212e11f VV |
1122 | kunmap_atomic(mem); |
1123 | ||
1124 | return ret; | |
1125 | } | |
1126 | ||
1127 | static int btt_data_write(struct arena_info *arena, u32 lba, | |
1128 | struct page *page, unsigned int off, u32 len) | |
1129 | { | |
1130 | int ret; | |
1131 | u64 nsoff = to_namespace_offset(arena, lba); | |
1132 | void *mem = kmap_atomic(page); | |
1133 | ||
3ae3d67b | 1134 | ret = arena_write_bytes(arena, nsoff, mem + off, len, NVDIMM_IO_ATOMIC); |
5212e11f VV |
1135 | kunmap_atomic(mem); |
1136 | ||
1137 | return ret; | |
1138 | } | |
1139 | ||
1140 | static void zero_fill_data(struct page *page, unsigned int off, u32 len) | |
1141 | { | |
1142 | void *mem = kmap_atomic(page); | |
1143 | ||
1144 | memset(mem + off, 0, len); | |
1145 | kunmap_atomic(mem); | |
1146 | } | |
1147 | ||
41cd8b70 VV |
1148 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
1149 | static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip, | |
1150 | struct arena_info *arena, u32 postmap, int rw) | |
1151 | { | |
1152 | unsigned int len = btt_meta_size(btt); | |
1153 | u64 meta_nsoff; | |
1154 | int ret = 0; | |
1155 | ||
1156 | if (bip == NULL) | |
1157 | return 0; | |
1158 | ||
1159 | meta_nsoff = to_namespace_offset(arena, postmap) + btt->sector_size; | |
1160 | ||
1161 | while (len) { | |
1162 | unsigned int cur_len; | |
1163 | struct bio_vec bv; | |
1164 | void *mem; | |
1165 | ||
1166 | bv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter); | |
1167 | /* | |
1168 | * The 'bv' obtained from bvec_iter_bvec has its .bv_len and | |
1169 | * .bv_offset already adjusted for iter->bi_bvec_done, and we | |
1170 | * can use those directly | |
1171 | */ | |
1172 | ||
1173 | cur_len = min(len, bv.bv_len); | |
1174 | mem = kmap_atomic(bv.bv_page); | |
1175 | if (rw) | |
1176 | ret = arena_write_bytes(arena, meta_nsoff, | |
3ae3d67b VV |
1177 | mem + bv.bv_offset, cur_len, |
1178 | NVDIMM_IO_ATOMIC); | |
41cd8b70 VV |
1179 | else |
1180 | ret = arena_read_bytes(arena, meta_nsoff, | |
3ae3d67b VV |
1181 | mem + bv.bv_offset, cur_len, |
1182 | NVDIMM_IO_ATOMIC); | |
41cd8b70 VV |
1183 | |
1184 | kunmap_atomic(mem); | |
1185 | if (ret) | |
1186 | return ret; | |
1187 | ||
1188 | len -= cur_len; | |
1189 | meta_nsoff += cur_len; | |
b1fb2c52 DM |
1190 | if (!bvec_iter_advance(bip->bip_vec, &bip->bip_iter, cur_len)) |
1191 | return -EIO; | |
41cd8b70 VV |
1192 | } |
1193 | ||
1194 | return ret; | |
1195 | } | |
1196 | ||
1197 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1198 | static int btt_rw_integrity(struct btt *btt, struct bio_integrity_payload *bip, | |
1199 | struct arena_info *arena, u32 postmap, int rw) | |
1200 | { | |
1201 | return 0; | |
1202 | } | |
1203 | #endif | |
1204 | ||
1205 | static int btt_read_pg(struct btt *btt, struct bio_integrity_payload *bip, | |
1206 | struct page *page, unsigned int off, sector_t sector, | |
1207 | unsigned int len) | |
5212e11f VV |
1208 | { |
1209 | int ret = 0; | |
1210 | int t_flag, e_flag; | |
1211 | struct arena_info *arena = NULL; | |
1212 | u32 lane = 0, premap, postmap; | |
1213 | ||
1214 | while (len) { | |
1215 | u32 cur_len; | |
1216 | ||
1217 | lane = nd_region_acquire_lane(btt->nd_region); | |
1218 | ||
1219 | ret = lba_to_arena(btt, sector, &premap, &arena); | |
1220 | if (ret) | |
1221 | goto out_lane; | |
1222 | ||
1223 | cur_len = min(btt->sector_size, len); | |
1224 | ||
3ae3d67b VV |
1225 | ret = btt_map_read(arena, premap, &postmap, &t_flag, &e_flag, |
1226 | NVDIMM_IO_ATOMIC); | |
5212e11f VV |
1227 | if (ret) |
1228 | goto out_lane; | |
1229 | ||
1230 | /* | |
1231 | * We loop to make sure that the post map LBA didn't change | |
1232 | * from under us between writing the RTT and doing the actual | |
1233 | * read. | |
1234 | */ | |
1235 | while (1) { | |
1236 | u32 new_map; | |
1398199d | 1237 | int new_t, new_e; |
5212e11f VV |
1238 | |
1239 | if (t_flag) { | |
1240 | zero_fill_data(page, off, cur_len); | |
1241 | goto out_lane; | |
1242 | } | |
1243 | ||
1244 | if (e_flag) { | |
1245 | ret = -EIO; | |
1246 | goto out_lane; | |
1247 | } | |
1248 | ||
1249 | arena->rtt[lane] = RTT_VALID | postmap; | |
1250 | /* | |
1251 | * Barrier to make sure this write is not reordered | |
1252 | * to do the verification map_read before the RTT store | |
1253 | */ | |
1254 | barrier(); | |
1255 | ||
1398199d VV |
1256 | ret = btt_map_read(arena, premap, &new_map, &new_t, |
1257 | &new_e, NVDIMM_IO_ATOMIC); | |
5212e11f VV |
1258 | if (ret) |
1259 | goto out_rtt; | |
1260 | ||
1398199d VV |
1261 | if ((postmap == new_map) && (t_flag == new_t) && |
1262 | (e_flag == new_e)) | |
5212e11f VV |
1263 | break; |
1264 | ||
1265 | postmap = new_map; | |
1398199d VV |
1266 | t_flag = new_t; |
1267 | e_flag = new_e; | |
5212e11f VV |
1268 | } |
1269 | ||
1270 | ret = btt_data_read(arena, page, off, postmap, cur_len); | |
d9b83c75 VV |
1271 | if (ret) { |
1272 | int rc; | |
1273 | ||
1274 | /* Media error - set the e_flag */ | |
1275 | rc = btt_map_write(arena, premap, postmap, 0, 1, | |
1276 | NVDIMM_IO_ATOMIC); | |
5212e11f | 1277 | goto out_rtt; |
d9b83c75 | 1278 | } |
5212e11f | 1279 | |
41cd8b70 VV |
1280 | if (bip) { |
1281 | ret = btt_rw_integrity(btt, bip, arena, postmap, READ); | |
1282 | if (ret) | |
1283 | goto out_rtt; | |
1284 | } | |
1285 | ||
5212e11f VV |
1286 | arena->rtt[lane] = RTT_INVALID; |
1287 | nd_region_release_lane(btt->nd_region, lane); | |
1288 | ||
1289 | len -= cur_len; | |
1290 | off += cur_len; | |
1291 | sector += btt->sector_size >> SECTOR_SHIFT; | |
1292 | } | |
1293 | ||
1294 | return 0; | |
1295 | ||
1296 | out_rtt: | |
1297 | arena->rtt[lane] = RTT_INVALID; | |
1298 | out_lane: | |
1299 | nd_region_release_lane(btt->nd_region, lane); | |
1300 | return ret; | |
1301 | } | |
1302 | ||
d9b83c75 VV |
1303 | /* |
1304 | * Normally, arena_{read,write}_bytes will take care of the initial offset | |
1305 | * adjustment, but in the case of btt_is_badblock, where we query is_bad_pmem, | |
1306 | * we need the final, raw namespace offset here | |
1307 | */ | |
1308 | static bool btt_is_badblock(struct btt *btt, struct arena_info *arena, | |
1309 | u32 postmap) | |
1310 | { | |
1311 | u64 nsoff = adjust_initial_offset(arena->nd_btt, | |
1312 | to_namespace_offset(arena, postmap)); | |
1313 | sector_t phys_sector = nsoff >> 9; | |
1314 | ||
1315 | return is_bad_pmem(btt->phys_bb, phys_sector, arena->internal_lbasize); | |
1316 | } | |
1317 | ||
41cd8b70 VV |
1318 | static int btt_write_pg(struct btt *btt, struct bio_integrity_payload *bip, |
1319 | sector_t sector, struct page *page, unsigned int off, | |
1320 | unsigned int len) | |
5212e11f VV |
1321 | { |
1322 | int ret = 0; | |
1323 | struct arena_info *arena = NULL; | |
1324 | u32 premap = 0, old_postmap, new_postmap, lane = 0, i; | |
1325 | struct log_entry log; | |
1326 | int sub; | |
1327 | ||
1328 | while (len) { | |
1329 | u32 cur_len; | |
d9b83c75 | 1330 | int e_flag; |
5212e11f | 1331 | |
d9b83c75 | 1332 | retry: |
5212e11f VV |
1333 | lane = nd_region_acquire_lane(btt->nd_region); |
1334 | ||
1335 | ret = lba_to_arena(btt, sector, &premap, &arena); | |
1336 | if (ret) | |
1337 | goto out_lane; | |
1338 | cur_len = min(btt->sector_size, len); | |
1339 | ||
1340 | if ((arena->flags & IB_FLAG_ERROR_MASK) != 0) { | |
1341 | ret = -EIO; | |
1342 | goto out_lane; | |
1343 | } | |
1344 | ||
d9b83c75 VV |
1345 | if (btt_is_badblock(btt, arena, arena->freelist[lane].block)) |
1346 | arena->freelist[lane].has_err = 1; | |
1347 | ||
1348 | if (mutex_is_locked(&arena->err_lock) | |
1349 | || arena->freelist[lane].has_err) { | |
1350 | nd_region_release_lane(btt->nd_region, lane); | |
1351 | ||
1352 | ret = arena_clear_freelist_error(arena, lane); | |
1353 | if (ret) | |
1354 | return ret; | |
1355 | ||
1356 | /* OK to acquire a different lane/free block */ | |
1357 | goto retry; | |
1358 | } | |
1359 | ||
5212e11f VV |
1360 | new_postmap = arena->freelist[lane].block; |
1361 | ||
1362 | /* Wait if the new block is being read from */ | |
1363 | for (i = 0; i < arena->nfree; i++) | |
1364 | while (arena->rtt[i] == (RTT_VALID | new_postmap)) | |
1365 | cpu_relax(); | |
1366 | ||
1367 | ||
1368 | if (new_postmap >= arena->internal_nlba) { | |
1369 | ret = -EIO; | |
1370 | goto out_lane; | |
41cd8b70 VV |
1371 | } |
1372 | ||
1373 | ret = btt_data_write(arena, new_postmap, page, off, cur_len); | |
5212e11f VV |
1374 | if (ret) |
1375 | goto out_lane; | |
1376 | ||
41cd8b70 VV |
1377 | if (bip) { |
1378 | ret = btt_rw_integrity(btt, bip, arena, new_postmap, | |
1379 | WRITE); | |
1380 | if (ret) | |
1381 | goto out_lane; | |
1382 | } | |
1383 | ||
5212e11f | 1384 | lock_map(arena, premap); |
d9b83c75 | 1385 | ret = btt_map_read(arena, premap, &old_postmap, NULL, &e_flag, |
3ae3d67b | 1386 | NVDIMM_IO_ATOMIC); |
5212e11f VV |
1387 | if (ret) |
1388 | goto out_map; | |
1389 | if (old_postmap >= arena->internal_nlba) { | |
1390 | ret = -EIO; | |
1391 | goto out_map; | |
1392 | } | |
d9b83c75 VV |
1393 | if (e_flag) |
1394 | set_e_flag(old_postmap); | |
5212e11f VV |
1395 | |
1396 | log.lba = cpu_to_le32(premap); | |
1397 | log.old_map = cpu_to_le32(old_postmap); | |
1398 | log.new_map = cpu_to_le32(new_postmap); | |
1399 | log.seq = cpu_to_le32(arena->freelist[lane].seq); | |
1400 | sub = arena->freelist[lane].sub; | |
1401 | ret = btt_flog_write(arena, lane, sub, &log); | |
1402 | if (ret) | |
1403 | goto out_map; | |
1404 | ||
1db1f3ce VV |
1405 | ret = btt_map_write(arena, premap, new_postmap, 0, 0, |
1406 | NVDIMM_IO_ATOMIC); | |
5212e11f VV |
1407 | if (ret) |
1408 | goto out_map; | |
1409 | ||
1410 | unlock_map(arena, premap); | |
1411 | nd_region_release_lane(btt->nd_region, lane); | |
1412 | ||
d9b83c75 VV |
1413 | if (e_flag) { |
1414 | ret = arena_clear_freelist_error(arena, lane); | |
1415 | if (ret) | |
1416 | return ret; | |
1417 | } | |
1418 | ||
5212e11f VV |
1419 | len -= cur_len; |
1420 | off += cur_len; | |
1421 | sector += btt->sector_size >> SECTOR_SHIFT; | |
1422 | } | |
1423 | ||
1424 | return 0; | |
1425 | ||
1426 | out_map: | |
1427 | unlock_map(arena, premap); | |
1428 | out_lane: | |
1429 | nd_region_release_lane(btt->nd_region, lane); | |
1430 | return ret; | |
1431 | } | |
1432 | ||
41cd8b70 VV |
1433 | static int btt_do_bvec(struct btt *btt, struct bio_integrity_payload *bip, |
1434 | struct page *page, unsigned int len, unsigned int off, | |
3f289dcb | 1435 | unsigned int op, sector_t sector) |
5212e11f VV |
1436 | { |
1437 | int ret; | |
1438 | ||
3f289dcb | 1439 | if (!op_is_write(op)) { |
41cd8b70 | 1440 | ret = btt_read_pg(btt, bip, page, off, sector, len); |
5212e11f VV |
1441 | flush_dcache_page(page); |
1442 | } else { | |
1443 | flush_dcache_page(page); | |
41cd8b70 | 1444 | ret = btt_write_pg(btt, bip, sector, page, off, len); |
5212e11f VV |
1445 | } |
1446 | ||
1447 | return ret; | |
1448 | } | |
1449 | ||
dece1635 | 1450 | static blk_qc_t btt_make_request(struct request_queue *q, struct bio *bio) |
5212e11f | 1451 | { |
41cd8b70 | 1452 | struct bio_integrity_payload *bip = bio_integrity(bio); |
5212e11f VV |
1453 | struct btt *btt = q->queuedata; |
1454 | struct bvec_iter iter; | |
f0dc089c | 1455 | unsigned long start; |
5212e11f | 1456 | struct bio_vec bvec; |
abf54548 | 1457 | int err = 0; |
f0dc089c | 1458 | bool do_acct; |
5212e11f | 1459 | |
e23947bd DM |
1460 | if (!bio_integrity_prep(bio)) |
1461 | return BLK_QC_T_NONE; | |
41cd8b70 | 1462 | |
f0dc089c | 1463 | do_acct = nd_iostat_start(bio, &start); |
5212e11f VV |
1464 | bio_for_each_segment(bvec, bio, iter) { |
1465 | unsigned int len = bvec.bv_len; | |
1466 | ||
86652d2e VV |
1467 | if (len > PAGE_SIZE || len < btt->sector_size || |
1468 | len % btt->sector_size) { | |
1469 | dev_err_ratelimited(&btt->nd_btt->dev, | |
1470 | "unaligned bio segment (len: %d)\n", len); | |
1471 | bio->bi_status = BLK_STS_IOERR; | |
1472 | break; | |
1473 | } | |
5212e11f | 1474 | |
41cd8b70 | 1475 | err = btt_do_bvec(btt, bip, bvec.bv_page, len, bvec.bv_offset, |
3f289dcb | 1476 | bio_op(bio), iter.bi_sector); |
5212e11f | 1477 | if (err) { |
e6be2dcb | 1478 | dev_err(&btt->nd_btt->dev, |
5212e11f | 1479 | "io error in %s sector %lld, len %d,\n", |
abf54548 MC |
1480 | (op_is_write(bio_op(bio))) ? "WRITE" : |
1481 | "READ", | |
5212e11f | 1482 | (unsigned long long) iter.bi_sector, len); |
4e4cbee9 | 1483 | bio->bi_status = errno_to_blk_status(err); |
f0dc089c | 1484 | break; |
5212e11f VV |
1485 | } |
1486 | } | |
f0dc089c DW |
1487 | if (do_acct) |
1488 | nd_iostat_end(bio, start); | |
5212e11f | 1489 | |
4246a0b6 | 1490 | bio_endio(bio); |
dece1635 | 1491 | return BLK_QC_T_NONE; |
5212e11f VV |
1492 | } |
1493 | ||
1494 | static int btt_rw_page(struct block_device *bdev, sector_t sector, | |
3f289dcb | 1495 | struct page *page, unsigned int op) |
5212e11f VV |
1496 | { |
1497 | struct btt *btt = bdev->bd_disk->private_data; | |
c13c43d5 | 1498 | int rc; |
98cc093c | 1499 | unsigned int len; |
5212e11f | 1500 | |
98cc093c | 1501 | len = hpage_nr_pages(page) * PAGE_SIZE; |
3f289dcb | 1502 | rc = btt_do_bvec(btt, NULL, page, len, 0, op, sector); |
c13c43d5 | 1503 | if (rc == 0) |
3f289dcb | 1504 | page_endio(page, op_is_write(op), 0); |
c13c43d5 VV |
1505 | |
1506 | return rc; | |
5212e11f VV |
1507 | } |
1508 | ||
1509 | ||
1510 | static int btt_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
1511 | { | |
1512 | /* some standard values */ | |
1513 | geo->heads = 1 << 6; | |
1514 | geo->sectors = 1 << 5; | |
1515 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | static const struct block_device_operations btt_fops = { | |
1520 | .owner = THIS_MODULE, | |
1521 | .rw_page = btt_rw_page, | |
1522 | .getgeo = btt_getgeo, | |
58138820 | 1523 | .revalidate_disk = nvdimm_revalidate_disk, |
5212e11f VV |
1524 | }; |
1525 | ||
1526 | static int btt_blk_init(struct btt *btt) | |
1527 | { | |
1528 | struct nd_btt *nd_btt = btt->nd_btt; | |
1529 | struct nd_namespace_common *ndns = nd_btt->ndns; | |
1530 | ||
1531 | /* create a new disk and request queue for btt */ | |
1532 | btt->btt_queue = blk_alloc_queue(GFP_KERNEL); | |
1533 | if (!btt->btt_queue) | |
1534 | return -ENOMEM; | |
1535 | ||
1536 | btt->btt_disk = alloc_disk(0); | |
1537 | if (!btt->btt_disk) { | |
1538 | blk_cleanup_queue(btt->btt_queue); | |
1539 | return -ENOMEM; | |
1540 | } | |
1541 | ||
1542 | nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name); | |
5212e11f VV |
1543 | btt->btt_disk->first_minor = 0; |
1544 | btt->btt_disk->fops = &btt_fops; | |
1545 | btt->btt_disk->private_data = btt; | |
1546 | btt->btt_disk->queue = btt->btt_queue; | |
1547 | btt->btt_disk->flags = GENHD_FL_EXT_DEVT; | |
23c47d2a MK |
1548 | btt->btt_disk->queue->backing_dev_info->capabilities |= |
1549 | BDI_CAP_SYNCHRONOUS_IO; | |
5212e11f VV |
1550 | |
1551 | blk_queue_make_request(btt->btt_queue, btt_make_request); | |
1552 | blk_queue_logical_block_size(btt->btt_queue, btt->sector_size); | |
1553 | blk_queue_max_hw_sectors(btt->btt_queue, UINT_MAX); | |
8b904b5b | 1554 | blk_queue_flag_set(QUEUE_FLAG_NONROT, btt->btt_queue); |
5212e11f VV |
1555 | btt->btt_queue->queuedata = btt; |
1556 | ||
41cd8b70 VV |
1557 | if (btt_meta_size(btt)) { |
1558 | int rc = nd_integrity_init(btt->btt_disk, btt_meta_size(btt)); | |
1559 | ||
1560 | if (rc) { | |
1561 | del_gendisk(btt->btt_disk); | |
1562 | put_disk(btt->btt_disk); | |
1563 | blk_cleanup_queue(btt->btt_queue); | |
1564 | return rc; | |
1565 | } | |
1566 | } | |
1567 | set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9); | |
fef912bf | 1568 | device_add_disk(&btt->nd_btt->dev, btt->btt_disk, NULL); |
abe8b4e3 | 1569 | btt->nd_btt->size = btt->nlba * (u64)btt->sector_size; |
58138820 | 1570 | revalidate_disk(btt->btt_disk); |
5212e11f VV |
1571 | |
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | static void btt_blk_cleanup(struct btt *btt) | |
1576 | { | |
1577 | del_gendisk(btt->btt_disk); | |
1578 | put_disk(btt->btt_disk); | |
1579 | blk_cleanup_queue(btt->btt_queue); | |
1580 | } | |
1581 | ||
1582 | /** | |
1583 | * btt_init - initialize a block translation table for the given device | |
1584 | * @nd_btt: device with BTT geometry and backing device info | |
1585 | * @rawsize: raw size in bytes of the backing device | |
1586 | * @lbasize: lba size of the backing device | |
1587 | * @uuid: A uuid for the backing device - this is stored on media | |
1588 | * @maxlane: maximum number of parallel requests the device can handle | |
1589 | * | |
1590 | * Initialize a Block Translation Table on a backing device to provide | |
1591 | * single sector power fail atomicity. | |
1592 | * | |
1593 | * Context: | |
1594 | * Might sleep. | |
1595 | * | |
1596 | * Returns: | |
1597 | * Pointer to a new struct btt on success, NULL on failure. | |
1598 | */ | |
1599 | static struct btt *btt_init(struct nd_btt *nd_btt, unsigned long long rawsize, | |
1600 | u32 lbasize, u8 *uuid, struct nd_region *nd_region) | |
1601 | { | |
1602 | int ret; | |
1603 | struct btt *btt; | |
d9b83c75 | 1604 | struct nd_namespace_io *nsio; |
5212e11f VV |
1605 | struct device *dev = &nd_btt->dev; |
1606 | ||
e32bc729 | 1607 | btt = devm_kzalloc(dev, sizeof(struct btt), GFP_KERNEL); |
5212e11f VV |
1608 | if (!btt) |
1609 | return NULL; | |
1610 | ||
1611 | btt->nd_btt = nd_btt; | |
1612 | btt->rawsize = rawsize; | |
1613 | btt->lbasize = lbasize; | |
1614 | btt->sector_size = ((lbasize >= 4096) ? 4096 : 512); | |
1615 | INIT_LIST_HEAD(&btt->arena_list); | |
1616 | mutex_init(&btt->init_lock); | |
1617 | btt->nd_region = nd_region; | |
d9b83c75 VV |
1618 | nsio = to_nd_namespace_io(&nd_btt->ndns->dev); |
1619 | btt->phys_bb = &nsio->bb; | |
5212e11f VV |
1620 | |
1621 | ret = discover_arenas(btt); | |
1622 | if (ret) { | |
1623 | dev_err(dev, "init: error in arena_discover: %d\n", ret); | |
e32bc729 | 1624 | return NULL; |
5212e11f VV |
1625 | } |
1626 | ||
58138820 | 1627 | if (btt->init_state != INIT_READY && nd_region->ro) { |
e6be2dcb | 1628 | dev_warn(dev, "%s is read-only, unable to init btt metadata\n", |
58138820 | 1629 | dev_name(&nd_region->dev)); |
e32bc729 | 1630 | return NULL; |
58138820 | 1631 | } else if (btt->init_state != INIT_READY) { |
5212e11f VV |
1632 | btt->num_arenas = (rawsize / ARENA_MAX_SIZE) + |
1633 | ((rawsize % ARENA_MAX_SIZE) ? 1 : 0); | |
1634 | dev_dbg(dev, "init: %d arenas for %llu rawsize\n", | |
1635 | btt->num_arenas, rawsize); | |
1636 | ||
1637 | ret = create_arenas(btt); | |
1638 | if (ret) { | |
1639 | dev_info(dev, "init: create_arenas: %d\n", ret); | |
e32bc729 | 1640 | return NULL; |
5212e11f VV |
1641 | } |
1642 | ||
1643 | ret = btt_meta_init(btt); | |
1644 | if (ret) { | |
1645 | dev_err(dev, "init: error in meta_init: %d\n", ret); | |
e32bc729 | 1646 | return NULL; |
5212e11f VV |
1647 | } |
1648 | } | |
1649 | ||
1650 | ret = btt_blk_init(btt); | |
1651 | if (ret) { | |
1652 | dev_err(dev, "init: error in blk_init: %d\n", ret); | |
e32bc729 | 1653 | return NULL; |
5212e11f VV |
1654 | } |
1655 | ||
1656 | btt_debugfs_init(btt); | |
1657 | ||
1658 | return btt; | |
5212e11f VV |
1659 | } |
1660 | ||
1661 | /** | |
1662 | * btt_fini - de-initialize a BTT | |
1663 | * @btt: the BTT handle that was generated by btt_init | |
1664 | * | |
1665 | * De-initialize a Block Translation Table on device removal | |
1666 | * | |
1667 | * Context: | |
1668 | * Might sleep. | |
1669 | */ | |
1670 | static void btt_fini(struct btt *btt) | |
1671 | { | |
1672 | if (btt) { | |
1673 | btt_blk_cleanup(btt); | |
1674 | free_arenas(btt); | |
1675 | debugfs_remove_recursive(btt->debugfs_dir); | |
5212e11f VV |
1676 | } |
1677 | } | |
1678 | ||
1679 | int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns) | |
1680 | { | |
1681 | struct nd_btt *nd_btt = to_nd_btt(ndns->claim); | |
1682 | struct nd_region *nd_region; | |
14e49454 | 1683 | struct btt_sb *btt_sb; |
5212e11f VV |
1684 | struct btt *btt; |
1685 | size_t rawsize; | |
1686 | ||
9dec4892 DW |
1687 | if (!nd_btt->uuid || !nd_btt->ndns || !nd_btt->lbasize) { |
1688 | dev_dbg(&nd_btt->dev, "incomplete btt configuration\n"); | |
5212e11f | 1689 | return -ENODEV; |
9dec4892 | 1690 | } |
5212e11f | 1691 | |
14e49454 | 1692 | btt_sb = devm_kzalloc(&nd_btt->dev, sizeof(*btt_sb), GFP_KERNEL); |
ed36b4db CJ |
1693 | if (!btt_sb) |
1694 | return -ENOMEM; | |
14e49454 VV |
1695 | |
1696 | /* | |
1697 | * If this returns < 0, that is ok as it just means there wasn't | |
1698 | * an existing BTT, and we're creating a new one. We still need to | |
1699 | * call this as we need the version dependent fields in nd_btt to be | |
1700 | * set correctly based on the holder class | |
1701 | */ | |
1702 | nd_btt_version(nd_btt, ndns, btt_sb); | |
1703 | ||
1704 | rawsize = nvdimm_namespace_capacity(ndns) - nd_btt->initial_offset; | |
5212e11f | 1705 | if (rawsize < ARENA_MIN_SIZE) { |
9dec4892 | 1706 | dev_dbg(&nd_btt->dev, "%s must be at least %ld bytes\n", |
14e49454 VV |
1707 | dev_name(&ndns->dev), |
1708 | ARENA_MIN_SIZE + nd_btt->initial_offset); | |
5212e11f VV |
1709 | return -ENXIO; |
1710 | } | |
1711 | nd_region = to_nd_region(nd_btt->dev.parent); | |
1712 | btt = btt_init(nd_btt, rawsize, nd_btt->lbasize, nd_btt->uuid, | |
1713 | nd_region); | |
1714 | if (!btt) | |
1715 | return -ENOMEM; | |
1716 | nd_btt->btt = btt; | |
1717 | ||
1718 | return 0; | |
1719 | } | |
1720 | EXPORT_SYMBOL(nvdimm_namespace_attach_btt); | |
1721 | ||
298f2bc5 | 1722 | int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt) |
5212e11f | 1723 | { |
5212e11f VV |
1724 | struct btt *btt = nd_btt->btt; |
1725 | ||
1726 | btt_fini(btt); | |
1727 | nd_btt->btt = NULL; | |
1728 | ||
1729 | return 0; | |
1730 | } | |
1731 | EXPORT_SYMBOL(nvdimm_namespace_detach_btt); | |
1732 | ||
1733 | static int __init nd_btt_init(void) | |
1734 | { | |
ff8e92d5 | 1735 | int rc = 0; |
5212e11f VV |
1736 | |
1737 | debugfs_root = debugfs_create_dir("btt", NULL); | |
ff8e92d5 | 1738 | if (IS_ERR_OR_NULL(debugfs_root)) |
5212e11f | 1739 | rc = -ENXIO; |
5212e11f VV |
1740 | |
1741 | return rc; | |
1742 | } | |
1743 | ||
1744 | static void __exit nd_btt_exit(void) | |
1745 | { | |
1746 | debugfs_remove_recursive(debugfs_root); | |
5212e11f VV |
1747 | } |
1748 | ||
1749 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT); | |
1750 | MODULE_AUTHOR("Vishal Verma <vishal.l.verma@linux.intel.com>"); | |
1751 | MODULE_LICENSE("GPL v2"); | |
1752 | module_init(nd_btt_init); | |
1753 | module_exit(nd_btt_exit); |