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4a826c83 DW |
1 | /* |
2 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | */ | |
13 | #include <linux/device.h> | |
14 | #include <linux/ndctl.h> | |
b3fde74e | 15 | #include <linux/uuid.h> |
f524bf27 | 16 | #include <linux/slab.h> |
4a826c83 DW |
17 | #include <linux/io.h> |
18 | #include <linux/nd.h> | |
19 | #include "nd-core.h" | |
20 | #include "label.h" | |
21 | #include "nd.h" | |
22 | ||
b3fde74e | 23 | static guid_t nvdimm_btt_guid; |
14e49454 | 24 | static guid_t nvdimm_btt2_guid; |
b3fde74e DW |
25 | static guid_t nvdimm_pfn_guid; |
26 | static guid_t nvdimm_dax_guid; | |
27 | ||
4a826c83 DW |
28 | static u32 best_seq(u32 a, u32 b) |
29 | { | |
30 | a &= NSINDEX_SEQ_MASK; | |
31 | b &= NSINDEX_SEQ_MASK; | |
32 | ||
33 | if (a == 0 || a == b) | |
34 | return b; | |
35 | else if (b == 0) | |
36 | return a; | |
37 | else if (nd_inc_seq(a) == b) | |
38 | return b; | |
39 | else | |
40 | return a; | |
41 | } | |
42 | ||
564e871a DW |
43 | unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd) |
44 | { | |
45 | return ndd->nslabel_size; | |
46 | } | |
47 | ||
02881768 | 48 | int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd) |
4a826c83 | 49 | { |
02881768 DW |
50 | return ndd->nsarea.config_size / (sizeof_namespace_label(ndd) + 1); |
51 | } | |
4a826c83 | 52 | |
02881768 DW |
53 | size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd) |
54 | { | |
55 | u32 nslot, space, size; | |
4a826c83 DW |
56 | |
57 | /* | |
58 | * The minimum index space is 512 bytes, with that amount of | |
59 | * index we can describe ~1400 labels which is less than a byte | |
60 | * of overhead per label. Round up to a byte of overhead per | |
61 | * label and determine the size of the index region. Yes, this | |
62 | * starts to waste space at larger config_sizes, but it's | |
63 | * unlikely we'll ever see anything but 128K. | |
64 | */ | |
02881768 DW |
65 | nslot = nvdimm_num_label_slots(ndd); |
66 | space = ndd->nsarea.config_size - nslot * sizeof_namespace_label(ndd); | |
67 | size = ALIGN(sizeof(struct nd_namespace_index) + DIV_ROUND_UP(nslot, 8), | |
68 | NSINDEX_ALIGN) * 2; | |
69 | if (size <= space) | |
70 | return size / 2; | |
4a826c83 | 71 | |
02881768 DW |
72 | dev_err(ndd->dev, "label area (%d) too small to host (%d byte) labels\n", |
73 | ndd->nsarea.config_size, sizeof_namespace_label(ndd)); | |
74 | return 0; | |
f524bf27 DW |
75 | } |
76 | ||
564e871a | 77 | static int __nd_label_validate(struct nvdimm_drvdata *ndd) |
4a826c83 DW |
78 | { |
79 | /* | |
80 | * On media label format consists of two index blocks followed | |
81 | * by an array of labels. None of these structures are ever | |
82 | * updated in place. A sequence number tracks the current | |
83 | * active index and the next one to write, while labels are | |
84 | * written to free slots. | |
85 | * | |
86 | * +------------+ | |
87 | * | | | |
88 | * | nsindex0 | | |
89 | * | | | |
90 | * +------------+ | |
91 | * | | | |
92 | * | nsindex1 | | |
93 | * | | | |
94 | * +------------+ | |
95 | * | label0 | | |
96 | * +------------+ | |
97 | * | label1 | | |
98 | * +------------+ | |
99 | * | | | |
100 | * ....nslot... | |
101 | * | | | |
102 | * +------------+ | |
103 | * | labelN | | |
104 | * +------------+ | |
105 | */ | |
106 | struct nd_namespace_index *nsindex[] = { | |
107 | to_namespace_index(ndd, 0), | |
108 | to_namespace_index(ndd, 1), | |
109 | }; | |
110 | const int num_index = ARRAY_SIZE(nsindex); | |
111 | struct device *dev = ndd->dev; | |
112 | bool valid[2] = { 0 }; | |
113 | int i, num_valid = 0; | |
114 | u32 seq; | |
115 | ||
116 | for (i = 0; i < num_index; i++) { | |
117 | u32 nslot; | |
118 | u8 sig[NSINDEX_SIG_LEN]; | |
119 | u64 sum_save, sum, size; | |
564e871a | 120 | unsigned int version, labelsize; |
4a826c83 DW |
121 | |
122 | memcpy(sig, nsindex[i]->sig, NSINDEX_SIG_LEN); | |
123 | if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) { | |
124 | dev_dbg(dev, "%s: nsindex%d signature invalid\n", | |
125 | __func__, i); | |
126 | continue; | |
127 | } | |
564e871a DW |
128 | |
129 | /* label sizes larger than 128 arrived with v1.2 */ | |
130 | version = __le16_to_cpu(nsindex[i]->major) * 100 | |
131 | + __le16_to_cpu(nsindex[i]->minor); | |
132 | if (version >= 102) | |
133 | labelsize = 1 << (7 + nsindex[i]->labelsize); | |
134 | else | |
135 | labelsize = 128; | |
136 | ||
137 | if (labelsize != sizeof_namespace_label(ndd)) { | |
138 | dev_dbg(dev, "%s: nsindex%d labelsize %d invalid\n", | |
139 | __func__, i, nsindex[i]->labelsize); | |
140 | continue; | |
141 | } | |
142 | ||
4a826c83 DW |
143 | sum_save = __le64_to_cpu(nsindex[i]->checksum); |
144 | nsindex[i]->checksum = __cpu_to_le64(0); | |
145 | sum = nd_fletcher64(nsindex[i], sizeof_namespace_index(ndd), 1); | |
146 | nsindex[i]->checksum = __cpu_to_le64(sum_save); | |
147 | if (sum != sum_save) { | |
148 | dev_dbg(dev, "%s: nsindex%d checksum invalid\n", | |
149 | __func__, i); | |
150 | continue; | |
151 | } | |
152 | ||
153 | seq = __le32_to_cpu(nsindex[i]->seq); | |
154 | if ((seq & NSINDEX_SEQ_MASK) == 0) { | |
155 | dev_dbg(dev, "%s: nsindex%d sequence: %#x invalid\n", | |
156 | __func__, i, seq); | |
157 | continue; | |
158 | } | |
159 | ||
160 | /* sanity check the index against expected values */ | |
161 | if (__le64_to_cpu(nsindex[i]->myoff) | |
162 | != i * sizeof_namespace_index(ndd)) { | |
163 | dev_dbg(dev, "%s: nsindex%d myoff: %#llx invalid\n", | |
164 | __func__, i, (unsigned long long) | |
165 | __le64_to_cpu(nsindex[i]->myoff)); | |
166 | continue; | |
167 | } | |
168 | if (__le64_to_cpu(nsindex[i]->otheroff) | |
169 | != (!i) * sizeof_namespace_index(ndd)) { | |
170 | dev_dbg(dev, "%s: nsindex%d otheroff: %#llx invalid\n", | |
171 | __func__, i, (unsigned long long) | |
172 | __le64_to_cpu(nsindex[i]->otheroff)); | |
173 | continue; | |
174 | } | |
175 | ||
176 | size = __le64_to_cpu(nsindex[i]->mysize); | |
177 | if (size > sizeof_namespace_index(ndd) | |
178 | || size < sizeof(struct nd_namespace_index)) { | |
179 | dev_dbg(dev, "%s: nsindex%d mysize: %#llx invalid\n", | |
180 | __func__, i, size); | |
181 | continue; | |
182 | } | |
183 | ||
184 | nslot = __le32_to_cpu(nsindex[i]->nslot); | |
564e871a | 185 | if (nslot * sizeof_namespace_label(ndd) |
4a826c83 DW |
186 | + 2 * sizeof_namespace_index(ndd) |
187 | > ndd->nsarea.config_size) { | |
188 | dev_dbg(dev, "%s: nsindex%d nslot: %u invalid, config_size: %#x\n", | |
189 | __func__, i, nslot, | |
190 | ndd->nsarea.config_size); | |
191 | continue; | |
192 | } | |
193 | valid[i] = true; | |
194 | num_valid++; | |
195 | } | |
196 | ||
197 | switch (num_valid) { | |
198 | case 0: | |
199 | break; | |
200 | case 1: | |
201 | for (i = 0; i < num_index; i++) | |
202 | if (valid[i]) | |
203 | return i; | |
204 | /* can't have num_valid > 0 but valid[] = { false, false } */ | |
205 | WARN_ON(1); | |
206 | break; | |
207 | default: | |
208 | /* pick the best index... */ | |
209 | seq = best_seq(__le32_to_cpu(nsindex[0]->seq), | |
210 | __le32_to_cpu(nsindex[1]->seq)); | |
211 | if (seq == (__le32_to_cpu(nsindex[1]->seq) & NSINDEX_SEQ_MASK)) | |
212 | return 1; | |
213 | else | |
214 | return 0; | |
215 | break; | |
216 | } | |
217 | ||
218 | return -1; | |
219 | } | |
220 | ||
564e871a DW |
221 | int nd_label_validate(struct nvdimm_drvdata *ndd) |
222 | { | |
223 | /* | |
224 | * In order to probe for and validate namespace index blocks we | |
225 | * need to know the size of the labels, and we can't trust the | |
226 | * size of the labels until we validate the index blocks. | |
227 | * Resolve this dependency loop by probing for known label | |
8990cdf1 DW |
228 | * sizes, but default to v1.2 256-byte namespace labels if |
229 | * discovery fails. | |
564e871a | 230 | */ |
8990cdf1 | 231 | int label_size[] = { 128, 256 }; |
564e871a DW |
232 | int i, rc; |
233 | ||
234 | for (i = 0; i < ARRAY_SIZE(label_size); i++) { | |
235 | ndd->nslabel_size = label_size[i]; | |
236 | rc = __nd_label_validate(ndd); | |
237 | if (rc >= 0) | |
238 | return rc; | |
239 | } | |
240 | ||
241 | return -1; | |
242 | } | |
243 | ||
4a826c83 DW |
244 | void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst, |
245 | struct nd_namespace_index *src) | |
246 | { | |
247 | if (dst && src) | |
248 | /* pass */; | |
249 | else | |
250 | return; | |
251 | ||
252 | memcpy(dst, src, sizeof_namespace_index(ndd)); | |
253 | } | |
254 | ||
255 | static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd) | |
256 | { | |
257 | void *base = to_namespace_index(ndd, 0); | |
258 | ||
259 | return base + 2 * sizeof_namespace_index(ndd); | |
260 | } | |
261 | ||
f524bf27 DW |
262 | static int to_slot(struct nvdimm_drvdata *ndd, |
263 | struct nd_namespace_label *nd_label) | |
264 | { | |
564e871a DW |
265 | unsigned long label, base; |
266 | ||
267 | label = (unsigned long) nd_label; | |
268 | base = (unsigned long) nd_label_base(ndd); | |
269 | ||
270 | return (label - base) / sizeof_namespace_label(ndd); | |
271 | } | |
272 | ||
273 | static struct nd_namespace_label *to_label(struct nvdimm_drvdata *ndd, int slot) | |
274 | { | |
275 | unsigned long label, base; | |
276 | ||
277 | base = (unsigned long) nd_label_base(ndd); | |
278 | label = base + sizeof_namespace_label(ndd) * slot; | |
279 | ||
280 | return (struct nd_namespace_label *) label; | |
f524bf27 DW |
281 | } |
282 | ||
4a826c83 DW |
283 | #define for_each_clear_bit_le(bit, addr, size) \ |
284 | for ((bit) = find_next_zero_bit_le((addr), (size), 0); \ | |
285 | (bit) < (size); \ | |
286 | (bit) = find_next_zero_bit_le((addr), (size), (bit) + 1)) | |
287 | ||
288 | /** | |
f524bf27 | 289 | * preamble_index - common variable initialization for nd_label_* routines |
4a826c83 | 290 | * @ndd: dimm container for the relevant label set |
f524bf27 | 291 | * @idx: namespace_index index |
4a826c83 DW |
292 | * @nsindex_out: on return set to the currently active namespace index |
293 | * @free: on return set to the free label bitmap in the index | |
294 | * @nslot: on return set to the number of slots in the label space | |
295 | */ | |
f524bf27 | 296 | static bool preamble_index(struct nvdimm_drvdata *ndd, int idx, |
4a826c83 DW |
297 | struct nd_namespace_index **nsindex_out, |
298 | unsigned long **free, u32 *nslot) | |
299 | { | |
300 | struct nd_namespace_index *nsindex; | |
301 | ||
f524bf27 | 302 | nsindex = to_namespace_index(ndd, idx); |
4a826c83 DW |
303 | if (nsindex == NULL) |
304 | return false; | |
305 | ||
306 | *free = (unsigned long *) nsindex->free; | |
307 | *nslot = __le32_to_cpu(nsindex->nslot); | |
308 | *nsindex_out = nsindex; | |
309 | ||
310 | return true; | |
311 | } | |
312 | ||
bf9bccc1 | 313 | char *nd_label_gen_id(struct nd_label_id *label_id, u8 *uuid, u32 flags) |
4a826c83 DW |
314 | { |
315 | if (!label_id || !uuid) | |
316 | return NULL; | |
317 | snprintf(label_id->id, ND_LABEL_ID_SIZE, "%s-%pUb", | |
318 | flags & NSLABEL_FLAG_LOCAL ? "blk" : "pmem", uuid); | |
319 | return label_id->id; | |
320 | } | |
321 | ||
f524bf27 DW |
322 | static bool preamble_current(struct nvdimm_drvdata *ndd, |
323 | struct nd_namespace_index **nsindex, | |
324 | unsigned long **free, u32 *nslot) | |
325 | { | |
326 | return preamble_index(ndd, ndd->ns_current, nsindex, | |
327 | free, nslot); | |
328 | } | |
329 | ||
330 | static bool preamble_next(struct nvdimm_drvdata *ndd, | |
331 | struct nd_namespace_index **nsindex, | |
332 | unsigned long **free, u32 *nslot) | |
333 | { | |
334 | return preamble_index(ndd, ndd->ns_next, nsindex, | |
335 | free, nslot); | |
336 | } | |
337 | ||
355d8388 DW |
338 | static bool slot_valid(struct nvdimm_drvdata *ndd, |
339 | struct nd_namespace_label *nd_label, u32 slot) | |
4a826c83 DW |
340 | { |
341 | /* check that we are written where we expect to be written */ | |
342 | if (slot != __le32_to_cpu(nd_label->slot)) | |
343 | return false; | |
344 | ||
345 | /* check that DPA allocations are page aligned */ | |
346 | if ((__le64_to_cpu(nd_label->dpa) | |
347 | | __le64_to_cpu(nd_label->rawsize)) % SZ_4K) | |
348 | return false; | |
349 | ||
355d8388 DW |
350 | /* check checksum */ |
351 | if (namespace_label_has(ndd, checksum)) { | |
352 | u64 sum, sum_save; | |
353 | ||
354 | sum_save = __le64_to_cpu(nd_label->checksum); | |
355 | nd_label->checksum = __cpu_to_le64(0); | |
356 | sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1); | |
357 | nd_label->checksum = __cpu_to_le64(sum_save); | |
358 | if (sum != sum_save) { | |
359 | dev_dbg(ndd->dev, "%s fail checksum. slot: %d expect: %#llx\n", | |
360 | __func__, slot, sum); | |
361 | return false; | |
362 | } | |
363 | } | |
364 | ||
4a826c83 DW |
365 | return true; |
366 | } | |
367 | ||
368 | int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd) | |
369 | { | |
370 | struct nd_namespace_index *nsindex; | |
371 | unsigned long *free; | |
372 | u32 nslot, slot; | |
373 | ||
374 | if (!preamble_current(ndd, &nsindex, &free, &nslot)) | |
375 | return 0; /* no label, nothing to reserve */ | |
376 | ||
377 | for_each_clear_bit_le(slot, free, nslot) { | |
378 | struct nd_namespace_label *nd_label; | |
379 | struct nd_region *nd_region = NULL; | |
380 | u8 label_uuid[NSLABEL_UUID_LEN]; | |
381 | struct nd_label_id label_id; | |
382 | struct resource *res; | |
383 | u32 flags; | |
384 | ||
564e871a | 385 | nd_label = to_label(ndd, slot); |
4a826c83 | 386 | |
355d8388 | 387 | if (!slot_valid(ndd, nd_label, slot)) |
4a826c83 DW |
388 | continue; |
389 | ||
390 | memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN); | |
391 | flags = __le32_to_cpu(nd_label->flags); | |
392 | nd_label_gen_id(&label_id, label_uuid, flags); | |
393 | res = nvdimm_allocate_dpa(ndd, &label_id, | |
394 | __le64_to_cpu(nd_label->dpa), | |
395 | __le64_to_cpu(nd_label->rawsize)); | |
396 | nd_dbg_dpa(nd_region, ndd, res, "reserve\n"); | |
397 | if (!res) | |
398 | return -EBUSY; | |
399 | } | |
400 | ||
401 | return 0; | |
402 | } | |
bf9bccc1 DW |
403 | |
404 | int nd_label_active_count(struct nvdimm_drvdata *ndd) | |
405 | { | |
406 | struct nd_namespace_index *nsindex; | |
407 | unsigned long *free; | |
408 | u32 nslot, slot; | |
409 | int count = 0; | |
410 | ||
411 | if (!preamble_current(ndd, &nsindex, &free, &nslot)) | |
412 | return 0; | |
413 | ||
414 | for_each_clear_bit_le(slot, free, nslot) { | |
415 | struct nd_namespace_label *nd_label; | |
416 | ||
564e871a | 417 | nd_label = to_label(ndd, slot); |
bf9bccc1 | 418 | |
355d8388 | 419 | if (!slot_valid(ndd, nd_label, slot)) { |
bf9bccc1 DW |
420 | u32 label_slot = __le32_to_cpu(nd_label->slot); |
421 | u64 size = __le64_to_cpu(nd_label->rawsize); | |
422 | u64 dpa = __le64_to_cpu(nd_label->dpa); | |
423 | ||
424 | dev_dbg(ndd->dev, | |
425 | "%s: slot%d invalid slot: %d dpa: %llx size: %llx\n", | |
426 | __func__, slot, label_slot, dpa, size); | |
427 | continue; | |
428 | } | |
429 | count++; | |
430 | } | |
431 | return count; | |
432 | } | |
433 | ||
434 | struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n) | |
435 | { | |
436 | struct nd_namespace_index *nsindex; | |
437 | unsigned long *free; | |
438 | u32 nslot, slot; | |
439 | ||
440 | if (!preamble_current(ndd, &nsindex, &free, &nslot)) | |
441 | return NULL; | |
442 | ||
443 | for_each_clear_bit_le(slot, free, nslot) { | |
444 | struct nd_namespace_label *nd_label; | |
445 | ||
564e871a | 446 | nd_label = to_label(ndd, slot); |
355d8388 | 447 | if (!slot_valid(ndd, nd_label, slot)) |
bf9bccc1 DW |
448 | continue; |
449 | ||
450 | if (n-- == 0) | |
564e871a | 451 | return to_label(ndd, slot); |
bf9bccc1 DW |
452 | } |
453 | ||
454 | return NULL; | |
455 | } | |
f524bf27 | 456 | |
0ba1c634 | 457 | u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd) |
f524bf27 DW |
458 | { |
459 | struct nd_namespace_index *nsindex; | |
460 | unsigned long *free; | |
461 | u32 nslot, slot; | |
462 | ||
463 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) | |
464 | return UINT_MAX; | |
465 | ||
466 | WARN_ON(!is_nvdimm_bus_locked(ndd->dev)); | |
467 | ||
468 | slot = find_next_bit_le(free, nslot, 0); | |
469 | if (slot == nslot) | |
470 | return UINT_MAX; | |
471 | ||
472 | clear_bit_le(slot, free); | |
473 | ||
474 | return slot; | |
475 | } | |
476 | ||
0ba1c634 | 477 | bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot) |
f524bf27 DW |
478 | { |
479 | struct nd_namespace_index *nsindex; | |
480 | unsigned long *free; | |
481 | u32 nslot; | |
482 | ||
483 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) | |
484 | return false; | |
485 | ||
486 | WARN_ON(!is_nvdimm_bus_locked(ndd->dev)); | |
487 | ||
488 | if (slot < nslot) | |
489 | return !test_and_set_bit_le(slot, free); | |
490 | return false; | |
491 | } | |
492 | ||
493 | u32 nd_label_nfree(struct nvdimm_drvdata *ndd) | |
494 | { | |
495 | struct nd_namespace_index *nsindex; | |
496 | unsigned long *free; | |
497 | u32 nslot; | |
498 | ||
499 | WARN_ON(!is_nvdimm_bus_locked(ndd->dev)); | |
500 | ||
501 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) | |
0ba1c634 | 502 | return nvdimm_num_label_slots(ndd); |
f524bf27 DW |
503 | |
504 | return bitmap_weight(free, nslot); | |
505 | } | |
506 | ||
507 | static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq, | |
508 | unsigned long flags) | |
509 | { | |
510 | struct nd_namespace_index *nsindex; | |
511 | unsigned long offset; | |
512 | u64 checksum; | |
513 | u32 nslot; | |
514 | int rc; | |
515 | ||
516 | nsindex = to_namespace_index(ndd, index); | |
517 | if (flags & ND_NSINDEX_INIT) | |
518 | nslot = nvdimm_num_label_slots(ndd); | |
519 | else | |
520 | nslot = __le32_to_cpu(nsindex->nslot); | |
521 | ||
522 | memcpy(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN); | |
564e871a DW |
523 | memset(&nsindex->flags, 0, 3); |
524 | nsindex->labelsize = sizeof_namespace_label(ndd) >> 8; | |
f524bf27 DW |
525 | nsindex->seq = __cpu_to_le32(seq); |
526 | offset = (unsigned long) nsindex | |
527 | - (unsigned long) to_namespace_index(ndd, 0); | |
528 | nsindex->myoff = __cpu_to_le64(offset); | |
529 | nsindex->mysize = __cpu_to_le64(sizeof_namespace_index(ndd)); | |
530 | offset = (unsigned long) to_namespace_index(ndd, | |
531 | nd_label_next_nsindex(index)) | |
532 | - (unsigned long) to_namespace_index(ndd, 0); | |
533 | nsindex->otheroff = __cpu_to_le64(offset); | |
534 | offset = (unsigned long) nd_label_base(ndd) | |
535 | - (unsigned long) to_namespace_index(ndd, 0); | |
536 | nsindex->labeloff = __cpu_to_le64(offset); | |
537 | nsindex->nslot = __cpu_to_le32(nslot); | |
538 | nsindex->major = __cpu_to_le16(1); | |
8990cdf1 DW |
539 | if (sizeof_namespace_label(ndd) < 256) |
540 | nsindex->minor = __cpu_to_le16(1); | |
541 | else | |
542 | nsindex->minor = __cpu_to_le16(2); | |
f524bf27 DW |
543 | nsindex->checksum = __cpu_to_le64(0); |
544 | if (flags & ND_NSINDEX_INIT) { | |
545 | unsigned long *free = (unsigned long *) nsindex->free; | |
546 | u32 nfree = ALIGN(nslot, BITS_PER_LONG); | |
547 | int last_bits, i; | |
548 | ||
549 | memset(nsindex->free, 0xff, nfree / 8); | |
550 | for (i = 0, last_bits = nfree - nslot; i < last_bits; i++) | |
551 | clear_bit_le(nslot + i, free); | |
552 | } | |
553 | checksum = nd_fletcher64(nsindex, sizeof_namespace_index(ndd), 1); | |
554 | nsindex->checksum = __cpu_to_le64(checksum); | |
555 | rc = nvdimm_set_config_data(ndd, __le64_to_cpu(nsindex->myoff), | |
556 | nsindex, sizeof_namespace_index(ndd)); | |
557 | if (rc < 0) | |
558 | return rc; | |
559 | ||
560 | if (flags & ND_NSINDEX_INIT) | |
561 | return 0; | |
562 | ||
563 | /* copy the index we just wrote to the new 'next' */ | |
564 | WARN_ON(index != ndd->ns_next); | |
565 | nd_label_copy(ndd, to_current_namespace_index(ndd), nsindex); | |
566 | ndd->ns_current = nd_label_next_nsindex(ndd->ns_current); | |
567 | ndd->ns_next = nd_label_next_nsindex(ndd->ns_next); | |
568 | WARN_ON(ndd->ns_current == ndd->ns_next); | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd, | |
574 | struct nd_namespace_label *nd_label) | |
575 | { | |
576 | return (unsigned long) nd_label | |
577 | - (unsigned long) to_namespace_index(ndd, 0); | |
578 | } | |
579 | ||
b3fde74e DW |
580 | enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid) |
581 | { | |
582 | if (guid_equal(guid, &nvdimm_btt_guid)) | |
583 | return NVDIMM_CCLASS_BTT; | |
14e49454 VV |
584 | else if (guid_equal(guid, &nvdimm_btt2_guid)) |
585 | return NVDIMM_CCLASS_BTT2; | |
b3fde74e DW |
586 | else if (guid_equal(guid, &nvdimm_pfn_guid)) |
587 | return NVDIMM_CCLASS_PFN; | |
588 | else if (guid_equal(guid, &nvdimm_dax_guid)) | |
589 | return NVDIMM_CCLASS_DAX; | |
590 | else if (guid_equal(guid, &guid_null)) | |
591 | return NVDIMM_CCLASS_NONE; | |
592 | ||
593 | return NVDIMM_CCLASS_UNKNOWN; | |
594 | } | |
595 | ||
596 | static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class, | |
597 | guid_t *target) | |
598 | { | |
599 | if (claim_class == NVDIMM_CCLASS_BTT) | |
600 | return &nvdimm_btt_guid; | |
14e49454 VV |
601 | else if (claim_class == NVDIMM_CCLASS_BTT2) |
602 | return &nvdimm_btt2_guid; | |
b3fde74e DW |
603 | else if (claim_class == NVDIMM_CCLASS_PFN) |
604 | return &nvdimm_pfn_guid; | |
605 | else if (claim_class == NVDIMM_CCLASS_DAX) | |
606 | return &nvdimm_dax_guid; | |
607 | else if (claim_class == NVDIMM_CCLASS_UNKNOWN) { | |
608 | /* | |
609 | * If we're modifying a namespace for which we don't | |
610 | * know the claim_class, don't touch the existing guid. | |
611 | */ | |
612 | return target; | |
613 | } else | |
614 | return &guid_null; | |
615 | } | |
616 | ||
f524bf27 DW |
617 | static int __pmem_label_update(struct nd_region *nd_region, |
618 | struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm, | |
619 | int pos) | |
620 | { | |
b3fde74e | 621 | struct nd_namespace_common *ndns = &nspm->nsio.common; |
faec6f8a | 622 | struct nd_interleave_set *nd_set = nd_region->nd_set; |
f524bf27 | 623 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
16660eae | 624 | struct nd_label_ent *label_ent, *victim = NULL; |
f524bf27 DW |
625 | struct nd_namespace_label *nd_label; |
626 | struct nd_namespace_index *nsindex; | |
16660eae DW |
627 | struct nd_label_id label_id; |
628 | struct resource *res; | |
f524bf27 DW |
629 | unsigned long *free; |
630 | u32 nslot, slot; | |
631 | size_t offset; | |
c12c48ce | 632 | u64 cookie; |
f524bf27 DW |
633 | int rc; |
634 | ||
635 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) | |
636 | return -ENXIO; | |
637 | ||
c12c48ce | 638 | cookie = nd_region_interleave_set_cookie(nd_region, nsindex); |
16660eae DW |
639 | nd_label_gen_id(&label_id, nspm->uuid, 0); |
640 | for_each_dpa_resource(ndd, res) | |
641 | if (strcmp(res->name, label_id.id) == 0) | |
642 | break; | |
643 | ||
644 | if (!res) { | |
645 | WARN_ON_ONCE(1); | |
646 | return -ENXIO; | |
647 | } | |
648 | ||
f524bf27 DW |
649 | /* allocate and write the label to the staging (next) index */ |
650 | slot = nd_label_alloc_slot(ndd); | |
651 | if (slot == UINT_MAX) | |
652 | return -ENXIO; | |
653 | dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot); | |
654 | ||
564e871a DW |
655 | nd_label = to_label(ndd, slot); |
656 | memset(nd_label, 0, sizeof_namespace_label(ndd)); | |
f524bf27 DW |
657 | memcpy(nd_label->uuid, nspm->uuid, NSLABEL_UUID_LEN); |
658 | if (nspm->alt_name) | |
659 | memcpy(nd_label->name, nspm->alt_name, NSLABEL_NAME_LEN); | |
660 | nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_UPDATING); | |
661 | nd_label->nlabel = __cpu_to_le16(nd_region->ndr_mappings); | |
662 | nd_label->position = __cpu_to_le16(pos); | |
663 | nd_label->isetcookie = __cpu_to_le64(cookie); | |
16660eae | 664 | nd_label->rawsize = __cpu_to_le64(resource_size(res)); |
2de5148f | 665 | nd_label->lbasize = __cpu_to_le64(nspm->lbasize); |
16660eae | 666 | nd_label->dpa = __cpu_to_le64(res->start); |
f524bf27 | 667 | nd_label->slot = __cpu_to_le32(slot); |
faec6f8a DW |
668 | if (namespace_label_has(ndd, type_guid)) |
669 | guid_copy(&nd_label->type_guid, &nd_set->type_guid); | |
b3fde74e DW |
670 | if (namespace_label_has(ndd, abstraction_guid)) |
671 | guid_copy(&nd_label->abstraction_guid, | |
672 | to_abstraction_guid(ndns->claim_class, | |
673 | &nd_label->abstraction_guid)); | |
355d8388 DW |
674 | if (namespace_label_has(ndd, checksum)) { |
675 | u64 sum; | |
676 | ||
677 | nd_label->checksum = __cpu_to_le64(0); | |
678 | sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1); | |
679 | nd_label->checksum = __cpu_to_le64(sum); | |
680 | } | |
16660eae | 681 | nd_dbg_dpa(nd_region, ndd, res, "%s\n", __func__); |
f524bf27 DW |
682 | |
683 | /* update label */ | |
684 | offset = nd_label_offset(ndd, nd_label); | |
685 | rc = nvdimm_set_config_data(ndd, offset, nd_label, | |
564e871a | 686 | sizeof_namespace_label(ndd)); |
f524bf27 DW |
687 | if (rc < 0) |
688 | return rc; | |
689 | ||
690 | /* Garbage collect the previous label */ | |
ae8219f1 | 691 | mutex_lock(&nd_mapping->lock); |
16660eae DW |
692 | list_for_each_entry(label_ent, &nd_mapping->labels, list) { |
693 | if (!label_ent->label) | |
694 | continue; | |
695 | if (memcmp(nspm->uuid, label_ent->label->uuid, | |
696 | NSLABEL_UUID_LEN) != 0) | |
697 | continue; | |
698 | victim = label_ent; | |
699 | list_move_tail(&victim->list, &nd_mapping->labels); | |
700 | break; | |
701 | } | |
702 | if (victim) { | |
f524bf27 | 703 | dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot); |
16660eae DW |
704 | slot = to_slot(ndd, victim->label); |
705 | nd_label_free_slot(ndd, slot); | |
706 | victim->label = NULL; | |
f524bf27 DW |
707 | } |
708 | ||
709 | /* update index */ | |
710 | rc = nd_label_write_index(ndd, ndd->ns_next, | |
711 | nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0); | |
16660eae DW |
712 | if (rc == 0) { |
713 | list_for_each_entry(label_ent, &nd_mapping->labels, list) | |
714 | if (!label_ent->label) { | |
715 | label_ent->label = nd_label; | |
716 | nd_label = NULL; | |
717 | break; | |
718 | } | |
719 | dev_WARN_ONCE(&nspm->nsio.common.dev, nd_label, | |
720 | "failed to track label: %d\n", | |
721 | to_slot(ndd, nd_label)); | |
722 | if (nd_label) | |
723 | rc = -ENXIO; | |
724 | } | |
ae8219f1 | 725 | mutex_unlock(&nd_mapping->lock); |
0ba1c634 | 726 | |
ae8219f1 | 727 | return rc; |
0ba1c634 DW |
728 | } |
729 | ||
730 | static bool is_old_resource(struct resource *res, struct resource **list, int n) | |
f524bf27 DW |
731 | { |
732 | int i; | |
0ba1c634 DW |
733 | |
734 | if (res->flags & DPA_RESOURCE_ADJUSTED) | |
735 | return false; | |
736 | for (i = 0; i < n; i++) | |
737 | if (res == list[i]) | |
738 | return true; | |
739 | return false; | |
740 | } | |
741 | ||
742 | static struct resource *to_resource(struct nvdimm_drvdata *ndd, | |
743 | struct nd_namespace_label *nd_label) | |
744 | { | |
745 | struct resource *res; | |
746 | ||
747 | for_each_dpa_resource(ndd, res) { | |
748 | if (res->start != __le64_to_cpu(nd_label->dpa)) | |
749 | continue; | |
750 | if (resource_size(res) != __le64_to_cpu(nd_label->rawsize)) | |
751 | continue; | |
752 | return res; | |
753 | } | |
754 | ||
755 | return NULL; | |
756 | } | |
757 | ||
758 | /* | |
759 | * 1/ Account all the labels that can be freed after this update | |
760 | * 2/ Allocate and write the label to the staging (next) index | |
761 | * 3/ Record the resources in the namespace device | |
762 | */ | |
763 | static int __blk_label_update(struct nd_region *nd_region, | |
764 | struct nd_mapping *nd_mapping, struct nd_namespace_blk *nsblk, | |
765 | int num_labels) | |
766 | { | |
ae8219f1 | 767 | int i, alloc, victims, nfree, old_num_resources, nlabel, rc = -ENXIO; |
faec6f8a | 768 | struct nd_interleave_set *nd_set = nd_region->nd_set; |
b3fde74e | 769 | struct nd_namespace_common *ndns = &nsblk->common; |
0ba1c634 DW |
770 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
771 | struct nd_namespace_label *nd_label; | |
ae8219f1 | 772 | struct nd_label_ent *label_ent, *e; |
0ba1c634 DW |
773 | struct nd_namespace_index *nsindex; |
774 | unsigned long *free, *victim_map = NULL; | |
775 | struct resource *res, **old_res_list; | |
776 | struct nd_label_id label_id; | |
777 | u8 uuid[NSLABEL_UUID_LEN]; | |
3934d841 | 778 | int min_dpa_idx = 0; |
ae8219f1 | 779 | LIST_HEAD(list); |
0ba1c634 DW |
780 | u32 nslot, slot; |
781 | ||
782 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) | |
783 | return -ENXIO; | |
784 | ||
785 | old_res_list = nsblk->res; | |
786 | nfree = nd_label_nfree(ndd); | |
787 | old_num_resources = nsblk->num_resources; | |
788 | nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL); | |
789 | ||
790 | /* | |
791 | * We need to loop over the old resources a few times, which seems a | |
792 | * bit inefficient, but we need to know that we have the label | |
793 | * space before we start mutating the tracking structures. | |
794 | * Otherwise the recovery method of last resort for userspace is | |
795 | * disable and re-enable the parent region. | |
796 | */ | |
797 | alloc = 0; | |
798 | for_each_dpa_resource(ndd, res) { | |
799 | if (strcmp(res->name, label_id.id) != 0) | |
800 | continue; | |
801 | if (!is_old_resource(res, old_res_list, old_num_resources)) | |
802 | alloc++; | |
803 | } | |
804 | ||
805 | victims = 0; | |
806 | if (old_num_resources) { | |
807 | /* convert old local-label-map to dimm-slot victim-map */ | |
808 | victim_map = kcalloc(BITS_TO_LONGS(nslot), sizeof(long), | |
809 | GFP_KERNEL); | |
810 | if (!victim_map) | |
811 | return -ENOMEM; | |
812 | ||
813 | /* mark unused labels for garbage collection */ | |
814 | for_each_clear_bit_le(slot, free, nslot) { | |
564e871a | 815 | nd_label = to_label(ndd, slot); |
0ba1c634 DW |
816 | memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN); |
817 | if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0) | |
818 | continue; | |
819 | res = to_resource(ndd, nd_label); | |
820 | if (res && is_old_resource(res, old_res_list, | |
821 | old_num_resources)) | |
822 | continue; | |
823 | slot = to_slot(ndd, nd_label); | |
824 | set_bit(slot, victim_map); | |
825 | victims++; | |
826 | } | |
827 | } | |
828 | ||
829 | /* don't allow updates that consume the last label */ | |
830 | if (nfree - alloc < 0 || nfree - alloc + victims < 1) { | |
8c2f7e86 | 831 | dev_info(&nsblk->common.dev, "insufficient label space\n"); |
0ba1c634 DW |
832 | kfree(victim_map); |
833 | return -ENOSPC; | |
834 | } | |
835 | /* from here on we need to abort on error */ | |
836 | ||
837 | ||
838 | /* assign all resources to the namespace before writing the labels */ | |
839 | nsblk->res = NULL; | |
840 | nsblk->num_resources = 0; | |
841 | for_each_dpa_resource(ndd, res) { | |
842 | if (strcmp(res->name, label_id.id) != 0) | |
843 | continue; | |
844 | if (!nsblk_add_resource(nd_region, ndd, nsblk, res->start)) { | |
845 | rc = -ENOMEM; | |
846 | goto abort; | |
847 | } | |
848 | } | |
849 | ||
3934d841 DW |
850 | /* |
851 | * Find the resource associated with the first label in the set | |
852 | * per the v1.2 namespace specification. | |
853 | */ | |
854 | for (i = 0; i < nsblk->num_resources; i++) { | |
855 | struct resource *min = nsblk->res[min_dpa_idx]; | |
856 | ||
857 | res = nsblk->res[i]; | |
858 | if (res->start < min->start) | |
859 | min_dpa_idx = i; | |
860 | } | |
861 | ||
0ba1c634 DW |
862 | for (i = 0; i < nsblk->num_resources; i++) { |
863 | size_t offset; | |
864 | ||
865 | res = nsblk->res[i]; | |
866 | if (is_old_resource(res, old_res_list, old_num_resources)) | |
867 | continue; /* carry-over */ | |
868 | slot = nd_label_alloc_slot(ndd); | |
869 | if (slot == UINT_MAX) | |
870 | goto abort; | |
871 | dev_dbg(ndd->dev, "%s: allocated: %d\n", __func__, slot); | |
872 | ||
564e871a DW |
873 | nd_label = to_label(ndd, slot); |
874 | memset(nd_label, 0, sizeof_namespace_label(ndd)); | |
0ba1c634 DW |
875 | memcpy(nd_label->uuid, nsblk->uuid, NSLABEL_UUID_LEN); |
876 | if (nsblk->alt_name) | |
877 | memcpy(nd_label->name, nsblk->alt_name, | |
878 | NSLABEL_NAME_LEN); | |
879 | nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_LOCAL); | |
8f2bc243 DW |
880 | |
881 | /* | |
882 | * Use the presence of the type_guid as a flag to | |
3934d841 DW |
883 | * determine isetcookie usage and nlabel + position |
884 | * policy for blk-aperture namespaces. | |
8f2bc243 | 885 | */ |
3934d841 DW |
886 | if (namespace_label_has(ndd, type_guid)) { |
887 | if (i == min_dpa_idx) { | |
888 | nd_label->nlabel = __cpu_to_le16(nsblk->num_resources); | |
889 | nd_label->position = __cpu_to_le16(0); | |
890 | } else { | |
891 | nd_label->nlabel = __cpu_to_le16(0xffff); | |
892 | nd_label->position = __cpu_to_le16(0xffff); | |
893 | } | |
8f2bc243 | 894 | nd_label->isetcookie = __cpu_to_le64(nd_set->cookie2); |
3934d841 DW |
895 | } else { |
896 | nd_label->nlabel = __cpu_to_le16(0); /* N/A */ | |
897 | nd_label->position = __cpu_to_le16(0); /* N/A */ | |
8f2bc243 | 898 | nd_label->isetcookie = __cpu_to_le64(0); /* N/A */ |
3934d841 | 899 | } |
8f2bc243 | 900 | |
0ba1c634 DW |
901 | nd_label->dpa = __cpu_to_le64(res->start); |
902 | nd_label->rawsize = __cpu_to_le64(resource_size(res)); | |
903 | nd_label->lbasize = __cpu_to_le64(nsblk->lbasize); | |
904 | nd_label->slot = __cpu_to_le32(slot); | |
faec6f8a DW |
905 | if (namespace_label_has(ndd, type_guid)) |
906 | guid_copy(&nd_label->type_guid, &nd_set->type_guid); | |
b3fde74e DW |
907 | if (namespace_label_has(ndd, abstraction_guid)) |
908 | guid_copy(&nd_label->abstraction_guid, | |
909 | to_abstraction_guid(ndns->claim_class, | |
910 | &nd_label->abstraction_guid)); | |
911 | ||
355d8388 DW |
912 | if (namespace_label_has(ndd, checksum)) { |
913 | u64 sum; | |
914 | ||
915 | nd_label->checksum = __cpu_to_le64(0); | |
916 | sum = nd_fletcher64(nd_label, | |
917 | sizeof_namespace_label(ndd), 1); | |
918 | nd_label->checksum = __cpu_to_le64(sum); | |
919 | } | |
0ba1c634 DW |
920 | |
921 | /* update label */ | |
922 | offset = nd_label_offset(ndd, nd_label); | |
923 | rc = nvdimm_set_config_data(ndd, offset, nd_label, | |
564e871a | 924 | sizeof_namespace_label(ndd)); |
0ba1c634 DW |
925 | if (rc < 0) |
926 | goto abort; | |
927 | } | |
928 | ||
929 | /* free up now unused slots in the new index */ | |
930 | for_each_set_bit(slot, victim_map, victim_map ? nslot : 0) { | |
931 | dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot); | |
932 | nd_label_free_slot(ndd, slot); | |
933 | } | |
934 | ||
935 | /* update index */ | |
936 | rc = nd_label_write_index(ndd, ndd->ns_next, | |
937 | nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0); | |
938 | if (rc) | |
939 | goto abort; | |
940 | ||
941 | /* | |
942 | * Now that the on-dimm labels are up to date, fix up the tracking | |
943 | * entries in nd_mapping->labels | |
944 | */ | |
945 | nlabel = 0; | |
ae8219f1 DW |
946 | mutex_lock(&nd_mapping->lock); |
947 | list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) { | |
948 | nd_label = label_ent->label; | |
949 | if (!nd_label) | |
950 | continue; | |
0ba1c634 DW |
951 | nlabel++; |
952 | memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN); | |
953 | if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0) | |
954 | continue; | |
955 | nlabel--; | |
ae8219f1 DW |
956 | list_move(&label_ent->list, &list); |
957 | label_ent->label = NULL; | |
0ba1c634 | 958 | } |
ae8219f1 DW |
959 | list_splice_tail_init(&list, &nd_mapping->labels); |
960 | mutex_unlock(&nd_mapping->lock); | |
961 | ||
0ba1c634 DW |
962 | if (nlabel + nsblk->num_resources > num_labels) { |
963 | /* | |
964 | * Bug, we can't end up with more resources than | |
965 | * available labels | |
966 | */ | |
967 | WARN_ON_ONCE(1); | |
968 | rc = -ENXIO; | |
969 | goto out; | |
970 | } | |
971 | ||
ae8219f1 DW |
972 | mutex_lock(&nd_mapping->lock); |
973 | label_ent = list_first_entry_or_null(&nd_mapping->labels, | |
974 | typeof(*label_ent), list); | |
975 | if (!label_ent) { | |
976 | WARN_ON(1); | |
977 | mutex_unlock(&nd_mapping->lock); | |
978 | rc = -ENXIO; | |
979 | goto out; | |
980 | } | |
0ba1c634 | 981 | for_each_clear_bit_le(slot, free, nslot) { |
564e871a | 982 | nd_label = to_label(ndd, slot); |
0ba1c634 DW |
983 | memcpy(uuid, nd_label->uuid, NSLABEL_UUID_LEN); |
984 | if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) != 0) | |
985 | continue; | |
986 | res = to_resource(ndd, nd_label); | |
987 | res->flags &= ~DPA_RESOURCE_ADJUSTED; | |
ae8219f1 DW |
988 | dev_vdbg(&nsblk->common.dev, "assign label slot: %d\n", slot); |
989 | list_for_each_entry_from(label_ent, &nd_mapping->labels, list) { | |
990 | if (label_ent->label) | |
991 | continue; | |
992 | label_ent->label = nd_label; | |
993 | nd_label = NULL; | |
994 | break; | |
995 | } | |
996 | if (nd_label) | |
997 | dev_WARN(&nsblk->common.dev, | |
998 | "failed to track label slot%d\n", slot); | |
0ba1c634 | 999 | } |
ae8219f1 | 1000 | mutex_unlock(&nd_mapping->lock); |
0ba1c634 DW |
1001 | |
1002 | out: | |
1003 | kfree(old_res_list); | |
1004 | kfree(victim_map); | |
1005 | return rc; | |
1006 | ||
1007 | abort: | |
1008 | /* | |
1009 | * 1/ repair the allocated label bitmap in the index | |
1010 | * 2/ restore the resource list | |
1011 | */ | |
1012 | nd_label_copy(ndd, nsindex, to_current_namespace_index(ndd)); | |
1013 | kfree(nsblk->res); | |
1014 | nsblk->res = old_res_list; | |
1015 | nsblk->num_resources = old_num_resources; | |
1016 | old_res_list = NULL; | |
1017 | goto out; | |
1018 | } | |
1019 | ||
1020 | static int init_labels(struct nd_mapping *nd_mapping, int num_labels) | |
1021 | { | |
ae8219f1 DW |
1022 | int i, old_num_labels = 0; |
1023 | struct nd_label_ent *label_ent; | |
f524bf27 DW |
1024 | struct nd_namespace_index *nsindex; |
1025 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); | |
1026 | ||
ae8219f1 DW |
1027 | mutex_lock(&nd_mapping->lock); |
1028 | list_for_each_entry(label_ent, &nd_mapping->labels, list) | |
0ba1c634 | 1029 | old_num_labels++; |
ae8219f1 | 1030 | mutex_unlock(&nd_mapping->lock); |
f524bf27 | 1031 | |
0ba1c634 DW |
1032 | /* |
1033 | * We need to preserve all the old labels for the mapping so | |
1034 | * they can be garbage collected after writing the new labels. | |
1035 | */ | |
ae8219f1 DW |
1036 | for (i = old_num_labels; i < num_labels; i++) { |
1037 | label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL); | |
1038 | if (!label_ent) | |
0ba1c634 | 1039 | return -ENOMEM; |
ae8219f1 DW |
1040 | mutex_lock(&nd_mapping->lock); |
1041 | list_add_tail(&label_ent->list, &nd_mapping->labels); | |
1042 | mutex_unlock(&nd_mapping->lock); | |
0ba1c634 | 1043 | } |
0ba1c634 | 1044 | |
f524bf27 DW |
1045 | if (ndd->ns_current == -1 || ndd->ns_next == -1) |
1046 | /* pass */; | |
1047 | else | |
0ba1c634 | 1048 | return max(num_labels, old_num_labels); |
f524bf27 DW |
1049 | |
1050 | nsindex = to_namespace_index(ndd, 0); | |
1051 | memset(nsindex, 0, ndd->nsarea.config_size); | |
1052 | for (i = 0; i < 2; i++) { | |
1053 | int rc = nd_label_write_index(ndd, i, i*2, ND_NSINDEX_INIT); | |
1054 | ||
1055 | if (rc) | |
1056 | return rc; | |
1057 | } | |
1058 | ndd->ns_next = 1; | |
1059 | ndd->ns_current = 0; | |
1060 | ||
0ba1c634 | 1061 | return max(num_labels, old_num_labels); |
f524bf27 DW |
1062 | } |
1063 | ||
1064 | static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid) | |
1065 | { | |
1066 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); | |
ae8219f1 | 1067 | struct nd_label_ent *label_ent, *e; |
f524bf27 DW |
1068 | struct nd_namespace_index *nsindex; |
1069 | u8 label_uuid[NSLABEL_UUID_LEN]; | |
f524bf27 | 1070 | unsigned long *free; |
ae8219f1 | 1071 | LIST_HEAD(list); |
f524bf27 | 1072 | u32 nslot, slot; |
ae8219f1 | 1073 | int active = 0; |
f524bf27 DW |
1074 | |
1075 | if (!uuid) | |
1076 | return 0; | |
1077 | ||
1078 | /* no index || no labels == nothing to delete */ | |
ae8219f1 | 1079 | if (!preamble_next(ndd, &nsindex, &free, &nslot)) |
f524bf27 DW |
1080 | return 0; |
1081 | ||
ae8219f1 DW |
1082 | mutex_lock(&nd_mapping->lock); |
1083 | list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) { | |
1084 | struct nd_namespace_label *nd_label = label_ent->label; | |
1085 | ||
1086 | if (!nd_label) | |
1087 | continue; | |
1088 | active++; | |
f524bf27 DW |
1089 | memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN); |
1090 | if (memcmp(label_uuid, uuid, NSLABEL_UUID_LEN) != 0) | |
1091 | continue; | |
ae8219f1 | 1092 | active--; |
f524bf27 DW |
1093 | slot = to_slot(ndd, nd_label); |
1094 | nd_label_free_slot(ndd, slot); | |
1095 | dev_dbg(ndd->dev, "%s: free: %d\n", __func__, slot); | |
ae8219f1 DW |
1096 | list_move_tail(&label_ent->list, &list); |
1097 | label_ent->label = NULL; | |
f524bf27 | 1098 | } |
ae8219f1 | 1099 | list_splice_tail_init(&list, &nd_mapping->labels); |
f524bf27 | 1100 | |
ae8219f1 DW |
1101 | if (active == 0) { |
1102 | nd_mapping_free_labels(nd_mapping); | |
1103 | dev_dbg(ndd->dev, "%s: no more active labels\n", __func__); | |
f524bf27 | 1104 | } |
ae8219f1 | 1105 | mutex_unlock(&nd_mapping->lock); |
f524bf27 DW |
1106 | |
1107 | return nd_label_write_index(ndd, ndd->ns_next, | |
1108 | nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0); | |
1109 | } | |
1110 | ||
1111 | int nd_pmem_namespace_label_update(struct nd_region *nd_region, | |
1112 | struct nd_namespace_pmem *nspm, resource_size_t size) | |
1113 | { | |
1114 | int i; | |
1115 | ||
1116 | for (i = 0; i < nd_region->ndr_mappings; i++) { | |
1117 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; | |
16660eae DW |
1118 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
1119 | struct resource *res; | |
1120 | int rc, count = 0; | |
f524bf27 DW |
1121 | |
1122 | if (size == 0) { | |
1123 | rc = del_labels(nd_mapping, nspm->uuid); | |
1124 | if (rc) | |
1125 | return rc; | |
1126 | continue; | |
1127 | } | |
1128 | ||
16660eae | 1129 | for_each_dpa_resource(ndd, res) |
2d9a0274 | 1130 | if (strncmp(res->name, "pmem", 4) == 0) |
16660eae DW |
1131 | count++; |
1132 | WARN_ON_ONCE(!count); | |
1133 | ||
1134 | rc = init_labels(nd_mapping, count); | |
0ba1c634 | 1135 | if (rc < 0) |
f524bf27 DW |
1136 | return rc; |
1137 | ||
1138 | rc = __pmem_label_update(nd_region, nd_mapping, nspm, i); | |
1139 | if (rc) | |
1140 | return rc; | |
1141 | } | |
1142 | ||
1143 | return 0; | |
1144 | } | |
0ba1c634 DW |
1145 | |
1146 | int nd_blk_namespace_label_update(struct nd_region *nd_region, | |
1147 | struct nd_namespace_blk *nsblk, resource_size_t size) | |
1148 | { | |
1149 | struct nd_mapping *nd_mapping = &nd_region->mapping[0]; | |
1150 | struct resource *res; | |
1151 | int count = 0; | |
1152 | ||
1153 | if (size == 0) | |
1154 | return del_labels(nd_mapping, nsblk->uuid); | |
1155 | ||
1156 | for_each_dpa_resource(to_ndd(nd_mapping), res) | |
1157 | count++; | |
1158 | ||
1159 | count = init_labels(nd_mapping, count); | |
1160 | if (count < 0) | |
1161 | return count; | |
1162 | ||
1163 | return __blk_label_update(nd_region, nd_mapping, nsblk, count); | |
1164 | } | |
b3fde74e DW |
1165 | |
1166 | int __init nd_label_init(void) | |
1167 | { | |
1168 | WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid)); | |
14e49454 | 1169 | WARN_ON(guid_parse(NVDIMM_BTT2_GUID, &nvdimm_btt2_guid)); |
b3fde74e DW |
1170 | WARN_ON(guid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_guid)); |
1171 | WARN_ON(guid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_guid)); | |
1172 | ||
1173 | return 0; | |
1174 | } |