LoongArch: Parse MADT to get multi-processor information
[linux-2.6-microblaze.git] / drivers / nvdimm / label.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4  */
5 #include <linux/device.h>
6 #include <linux/ndctl.h>
7 #include <linux/uuid.h>
8 #include <linux/slab.h>
9 #include <linux/io.h>
10 #include <linux/nd.h>
11 #include "nd-core.h"
12 #include "label.h"
13 #include "nd.h"
14
15 static guid_t nvdimm_btt_guid;
16 static guid_t nvdimm_btt2_guid;
17 static guid_t nvdimm_pfn_guid;
18 static guid_t nvdimm_dax_guid;
19
20 static uuid_t nvdimm_btt_uuid;
21 static uuid_t nvdimm_btt2_uuid;
22 static uuid_t nvdimm_pfn_uuid;
23 static uuid_t nvdimm_dax_uuid;
24
25 static uuid_t cxl_region_uuid;
26 static uuid_t cxl_namespace_uuid;
27
28 static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
29
30 static u32 best_seq(u32 a, u32 b)
31 {
32         a &= NSINDEX_SEQ_MASK;
33         b &= NSINDEX_SEQ_MASK;
34
35         if (a == 0 || a == b)
36                 return b;
37         else if (b == 0)
38                 return a;
39         else if (nd_inc_seq(a) == b)
40                 return b;
41         else
42                 return a;
43 }
44
45 unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd)
46 {
47         return ndd->nslabel_size;
48 }
49
50 static size_t __sizeof_namespace_index(u32 nslot)
51 {
52         return ALIGN(sizeof(struct nd_namespace_index) + DIV_ROUND_UP(nslot, 8),
53                         NSINDEX_ALIGN);
54 }
55
56 static int __nvdimm_num_label_slots(struct nvdimm_drvdata *ndd,
57                 size_t index_size)
58 {
59         return (ndd->nsarea.config_size - index_size * 2) /
60                         sizeof_namespace_label(ndd);
61 }
62
63 int nvdimm_num_label_slots(struct nvdimm_drvdata *ndd)
64 {
65         u32 tmp_nslot, n;
66
67         tmp_nslot = ndd->nsarea.config_size / sizeof_namespace_label(ndd);
68         n = __sizeof_namespace_index(tmp_nslot) / NSINDEX_ALIGN;
69
70         return __nvdimm_num_label_slots(ndd, NSINDEX_ALIGN * n);
71 }
72
73 size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd)
74 {
75         u32 nslot, space, size;
76
77         /*
78          * Per UEFI 2.7, the minimum size of the Label Storage Area is large
79          * enough to hold 2 index blocks and 2 labels.  The minimum index
80          * block size is 256 bytes. The label size is 128 for namespaces
81          * prior to version 1.2 and at minimum 256 for version 1.2 and later.
82          */
83         nslot = nvdimm_num_label_slots(ndd);
84         space = ndd->nsarea.config_size - nslot * sizeof_namespace_label(ndd);
85         size = __sizeof_namespace_index(nslot) * 2;
86         if (size <= space && nslot >= 2)
87                 return size / 2;
88
89         dev_err(ndd->dev, "label area (%d) too small to host (%d byte) labels\n",
90                         ndd->nsarea.config_size, sizeof_namespace_label(ndd));
91         return 0;
92 }
93
94 static int __nd_label_validate(struct nvdimm_drvdata *ndd)
95 {
96         /*
97          * On media label format consists of two index blocks followed
98          * by an array of labels.  None of these structures are ever
99          * updated in place.  A sequence number tracks the current
100          * active index and the next one to write, while labels are
101          * written to free slots.
102          *
103          *     +------------+
104          *     |            |
105          *     |  nsindex0  |
106          *     |            |
107          *     +------------+
108          *     |            |
109          *     |  nsindex1  |
110          *     |            |
111          *     +------------+
112          *     |   label0   |
113          *     +------------+
114          *     |   label1   |
115          *     +------------+
116          *     |            |
117          *      ....nslot...
118          *     |            |
119          *     +------------+
120          *     |   labelN   |
121          *     +------------+
122          */
123         struct nd_namespace_index *nsindex[] = {
124                 to_namespace_index(ndd, 0),
125                 to_namespace_index(ndd, 1),
126         };
127         const int num_index = ARRAY_SIZE(nsindex);
128         struct device *dev = ndd->dev;
129         bool valid[2] = { 0 };
130         int i, num_valid = 0;
131         u32 seq;
132
133         for (i = 0; i < num_index; i++) {
134                 u32 nslot;
135                 u8 sig[NSINDEX_SIG_LEN];
136                 u64 sum_save, sum, size;
137                 unsigned int version, labelsize;
138
139                 memcpy(sig, nsindex[i]->sig, NSINDEX_SIG_LEN);
140                 if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) {
141                         dev_dbg(dev, "nsindex%d signature invalid\n", i);
142                         continue;
143                 }
144
145                 /* label sizes larger than 128 arrived with v1.2 */
146                 version = __le16_to_cpu(nsindex[i]->major) * 100
147                         + __le16_to_cpu(nsindex[i]->minor);
148                 if (version >= 102)
149                         labelsize = 1 << (7 + nsindex[i]->labelsize);
150                 else
151                         labelsize = 128;
152
153                 if (labelsize != sizeof_namespace_label(ndd)) {
154                         dev_dbg(dev, "nsindex%d labelsize %d invalid\n",
155                                         i, nsindex[i]->labelsize);
156                         continue;
157                 }
158
159                 sum_save = __le64_to_cpu(nsindex[i]->checksum);
160                 nsindex[i]->checksum = __cpu_to_le64(0);
161                 sum = nd_fletcher64(nsindex[i], sizeof_namespace_index(ndd), 1);
162                 nsindex[i]->checksum = __cpu_to_le64(sum_save);
163                 if (sum != sum_save) {
164                         dev_dbg(dev, "nsindex%d checksum invalid\n", i);
165                         continue;
166                 }
167
168                 seq = __le32_to_cpu(nsindex[i]->seq);
169                 if ((seq & NSINDEX_SEQ_MASK) == 0) {
170                         dev_dbg(dev, "nsindex%d sequence: %#x invalid\n", i, seq);
171                         continue;
172                 }
173
174                 /* sanity check the index against expected values */
175                 if (__le64_to_cpu(nsindex[i]->myoff)
176                                 != i * sizeof_namespace_index(ndd)) {
177                         dev_dbg(dev, "nsindex%d myoff: %#llx invalid\n",
178                                         i, (unsigned long long)
179                                         __le64_to_cpu(nsindex[i]->myoff));
180                         continue;
181                 }
182                 if (__le64_to_cpu(nsindex[i]->otheroff)
183                                 != (!i) * sizeof_namespace_index(ndd)) {
184                         dev_dbg(dev, "nsindex%d otheroff: %#llx invalid\n",
185                                         i, (unsigned long long)
186                                         __le64_to_cpu(nsindex[i]->otheroff));
187                         continue;
188                 }
189                 if (__le64_to_cpu(nsindex[i]->labeloff)
190                                 != 2 * sizeof_namespace_index(ndd)) {
191                         dev_dbg(dev, "nsindex%d labeloff: %#llx invalid\n",
192                                         i, (unsigned long long)
193                                         __le64_to_cpu(nsindex[i]->labeloff));
194                         continue;
195                 }
196
197                 size = __le64_to_cpu(nsindex[i]->mysize);
198                 if (size > sizeof_namespace_index(ndd)
199                                 || size < sizeof(struct nd_namespace_index)) {
200                         dev_dbg(dev, "nsindex%d mysize: %#llx invalid\n", i, size);
201                         continue;
202                 }
203
204                 nslot = __le32_to_cpu(nsindex[i]->nslot);
205                 if (nslot * sizeof_namespace_label(ndd)
206                                 + 2 * sizeof_namespace_index(ndd)
207                                 > ndd->nsarea.config_size) {
208                         dev_dbg(dev, "nsindex%d nslot: %u invalid, config_size: %#x\n",
209                                         i, nslot, ndd->nsarea.config_size);
210                         continue;
211                 }
212                 valid[i] = true;
213                 num_valid++;
214         }
215
216         switch (num_valid) {
217         case 0:
218                 break;
219         case 1:
220                 for (i = 0; i < num_index; i++)
221                         if (valid[i])
222                                 return i;
223                 /* can't have num_valid > 0 but valid[] = { false, false } */
224                 WARN_ON(1);
225                 break;
226         default:
227                 /* pick the best index... */
228                 seq = best_seq(__le32_to_cpu(nsindex[0]->seq),
229                                 __le32_to_cpu(nsindex[1]->seq));
230                 if (seq == (__le32_to_cpu(nsindex[1]->seq) & NSINDEX_SEQ_MASK))
231                         return 1;
232                 else
233                         return 0;
234                 break;
235         }
236
237         return -1;
238 }
239
240 static int nd_label_validate(struct nvdimm_drvdata *ndd)
241 {
242         /*
243          * In order to probe for and validate namespace index blocks we
244          * need to know the size of the labels, and we can't trust the
245          * size of the labels until we validate the index blocks.
246          * Resolve this dependency loop by probing for known label
247          * sizes, but default to v1.2 256-byte namespace labels if
248          * discovery fails.
249          */
250         int label_size[] = { 128, 256 };
251         int i, rc;
252
253         for (i = 0; i < ARRAY_SIZE(label_size); i++) {
254                 ndd->nslabel_size = label_size[i];
255                 rc = __nd_label_validate(ndd);
256                 if (rc >= 0)
257                         return rc;
258         }
259
260         return -1;
261 }
262
263 static void nd_label_copy(struct nvdimm_drvdata *ndd,
264                           struct nd_namespace_index *dst,
265                           struct nd_namespace_index *src)
266 {
267         /* just exit if either destination or source is NULL */
268         if (!dst || !src)
269                 return;
270
271         memcpy(dst, src, sizeof_namespace_index(ndd));
272 }
273
274 static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd)
275 {
276         void *base = to_namespace_index(ndd, 0);
277
278         return base + 2 * sizeof_namespace_index(ndd);
279 }
280
281 static int to_slot(struct nvdimm_drvdata *ndd,
282                 struct nd_namespace_label *nd_label)
283 {
284         unsigned long label, base;
285
286         label = (unsigned long) nd_label;
287         base = (unsigned long) nd_label_base(ndd);
288
289         return (label - base) / sizeof_namespace_label(ndd);
290 }
291
292 static struct nd_namespace_label *to_label(struct nvdimm_drvdata *ndd, int slot)
293 {
294         unsigned long label, base;
295
296         base = (unsigned long) nd_label_base(ndd);
297         label = base + sizeof_namespace_label(ndd) * slot;
298
299         return (struct nd_namespace_label *) label;
300 }
301
302 #define for_each_clear_bit_le(bit, addr, size) \
303         for ((bit) = find_next_zero_bit_le((addr), (size), 0);  \
304              (bit) < (size);                                    \
305              (bit) = find_next_zero_bit_le((addr), (size), (bit) + 1))
306
307 /**
308  * preamble_index - common variable initialization for nd_label_* routines
309  * @ndd: dimm container for the relevant label set
310  * @idx: namespace_index index
311  * @nsindex_out: on return set to the currently active namespace index
312  * @free: on return set to the free label bitmap in the index
313  * @nslot: on return set to the number of slots in the label space
314  */
315 static bool preamble_index(struct nvdimm_drvdata *ndd, int idx,
316                 struct nd_namespace_index **nsindex_out,
317                 unsigned long **free, u32 *nslot)
318 {
319         struct nd_namespace_index *nsindex;
320
321         nsindex = to_namespace_index(ndd, idx);
322         if (nsindex == NULL)
323                 return false;
324
325         *free = (unsigned long *) nsindex->free;
326         *nslot = __le32_to_cpu(nsindex->nslot);
327         *nsindex_out = nsindex;
328
329         return true;
330 }
331
332 char *nd_label_gen_id(struct nd_label_id *label_id, const uuid_t *uuid,
333                       u32 flags)
334 {
335         if (!label_id || !uuid)
336                 return NULL;
337         snprintf(label_id->id, ND_LABEL_ID_SIZE, "pmem-%pUb", uuid);
338         return label_id->id;
339 }
340
341 static bool preamble_current(struct nvdimm_drvdata *ndd,
342                 struct nd_namespace_index **nsindex,
343                 unsigned long **free, u32 *nslot)
344 {
345         return preamble_index(ndd, ndd->ns_current, nsindex,
346                         free, nslot);
347 }
348
349 static bool preamble_next(struct nvdimm_drvdata *ndd,
350                 struct nd_namespace_index **nsindex,
351                 unsigned long **free, u32 *nslot)
352 {
353         return preamble_index(ndd, ndd->ns_next, nsindex,
354                         free, nslot);
355 }
356
357 static bool nsl_validate_checksum(struct nvdimm_drvdata *ndd,
358                                   struct nd_namespace_label *nd_label)
359 {
360         u64 sum, sum_save;
361
362         if (!ndd->cxl && !efi_namespace_label_has(ndd, checksum))
363                 return true;
364
365         sum_save = nsl_get_checksum(ndd, nd_label);
366         nsl_set_checksum(ndd, nd_label, 0);
367         sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
368         nsl_set_checksum(ndd, nd_label, sum_save);
369         return sum == sum_save;
370 }
371
372 static void nsl_calculate_checksum(struct nvdimm_drvdata *ndd,
373                                    struct nd_namespace_label *nd_label)
374 {
375         u64 sum;
376
377         if (!ndd->cxl && !efi_namespace_label_has(ndd, checksum))
378                 return;
379         nsl_set_checksum(ndd, nd_label, 0);
380         sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
381         nsl_set_checksum(ndd, nd_label, sum);
382 }
383
384 static bool slot_valid(struct nvdimm_drvdata *ndd,
385                 struct nd_namespace_label *nd_label, u32 slot)
386 {
387         bool valid;
388
389         /* check that we are written where we expect to be written */
390         if (slot != nsl_get_slot(ndd, nd_label))
391                 return false;
392         valid = nsl_validate_checksum(ndd, nd_label);
393         if (!valid)
394                 dev_dbg(ndd->dev, "fail checksum. slot: %d\n", slot);
395         return valid;
396 }
397
398 int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
399 {
400         struct nd_namespace_index *nsindex;
401         unsigned long *free;
402         u32 nslot, slot;
403
404         if (!preamble_current(ndd, &nsindex, &free, &nslot))
405                 return 0; /* no label, nothing to reserve */
406
407         for_each_clear_bit_le(slot, free, nslot) {
408                 struct nd_namespace_label *nd_label;
409                 struct nd_region *nd_region = NULL;
410                 struct nd_label_id label_id;
411                 struct resource *res;
412                 uuid_t label_uuid;
413                 u32 flags;
414
415                 nd_label = to_label(ndd, slot);
416
417                 if (!slot_valid(ndd, nd_label, slot))
418                         continue;
419
420                 nsl_get_uuid(ndd, nd_label, &label_uuid);
421                 flags = nsl_get_flags(ndd, nd_label);
422                 nd_label_gen_id(&label_id, &label_uuid, flags);
423                 res = nvdimm_allocate_dpa(ndd, &label_id,
424                                           nsl_get_dpa(ndd, nd_label),
425                                           nsl_get_rawsize(ndd, nd_label));
426                 nd_dbg_dpa(nd_region, ndd, res, "reserve\n");
427                 if (!res)
428                         return -EBUSY;
429         }
430
431         return 0;
432 }
433
434 int nd_label_data_init(struct nvdimm_drvdata *ndd)
435 {
436         size_t config_size, read_size, max_xfer, offset;
437         struct nd_namespace_index *nsindex;
438         unsigned int i;
439         int rc = 0;
440         u32 nslot;
441
442         if (ndd->data)
443                 return 0;
444
445         if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0) {
446                 dev_dbg(ndd->dev, "failed to init config data area: (%u:%u)\n",
447                         ndd->nsarea.max_xfer, ndd->nsarea.config_size);
448                 return -ENXIO;
449         }
450
451         /*
452          * We need to determine the maximum index area as this is the section
453          * we must read and validate before we can start processing labels.
454          *
455          * If the area is too small to contain the two indexes and 2 labels
456          * then we abort.
457          *
458          * Start at a label size of 128 as this should result in the largest
459          * possible namespace index size.
460          */
461         ndd->nslabel_size = 128;
462         read_size = sizeof_namespace_index(ndd) * 2;
463         if (!read_size)
464                 return -ENXIO;
465
466         /* Allocate config data */
467         config_size = ndd->nsarea.config_size;
468         ndd->data = kvzalloc(config_size, GFP_KERNEL);
469         if (!ndd->data)
470                 return -ENOMEM;
471
472         /*
473          * We want to guarantee as few reads as possible while conserving
474          * memory. To do that we figure out how much unused space will be left
475          * in the last read, divide that by the total number of reads it is
476          * going to take given our maximum transfer size, and then reduce our
477          * maximum transfer size based on that result.
478          */
479         max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size);
480         if (read_size < max_xfer) {
481                 /* trim waste */
482                 max_xfer -= ((max_xfer - 1) - (config_size - 1) % max_xfer) /
483                             DIV_ROUND_UP(config_size, max_xfer);
484                 /* make certain we read indexes in exactly 1 read */
485                 if (max_xfer < read_size)
486                         max_xfer = read_size;
487         }
488
489         /* Make our initial read size a multiple of max_xfer size */
490         read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer,
491                         config_size);
492
493         /* Read the index data */
494         rc = nvdimm_get_config_data(ndd, ndd->data, 0, read_size);
495         if (rc)
496                 goto out_err;
497
498         /* Validate index data, if not valid assume all labels are invalid */
499         ndd->ns_current = nd_label_validate(ndd);
500         if (ndd->ns_current < 0)
501                 return 0;
502
503         /* Record our index values */
504         ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
505
506         /* Copy "current" index on top of the "next" index */
507         nsindex = to_current_namespace_index(ndd);
508         nd_label_copy(ndd, to_next_namespace_index(ndd), nsindex);
509
510         /* Determine starting offset for label data */
511         offset = __le64_to_cpu(nsindex->labeloff);
512         nslot = __le32_to_cpu(nsindex->nslot);
513
514         /* Loop through the free list pulling in any active labels */
515         for (i = 0; i < nslot; i++, offset += ndd->nslabel_size) {
516                 size_t label_read_size;
517
518                 /* zero out the unused labels */
519                 if (test_bit_le(i, nsindex->free)) {
520                         memset(ndd->data + offset, 0, ndd->nslabel_size);
521                         continue;
522                 }
523
524                 /* if we already read past here then just continue */
525                 if (offset + ndd->nslabel_size <= read_size)
526                         continue;
527
528                 /* if we haven't read in a while reset our read_size offset */
529                 if (read_size < offset)
530                         read_size = offset;
531
532                 /* determine how much more will be read after this next call. */
533                 label_read_size = offset + ndd->nslabel_size - read_size;
534                 label_read_size = DIV_ROUND_UP(label_read_size, max_xfer) *
535                                   max_xfer;
536
537                 /* truncate last read if needed */
538                 if (read_size + label_read_size > config_size)
539                         label_read_size = config_size - read_size;
540
541                 /* Read the label data */
542                 rc = nvdimm_get_config_data(ndd, ndd->data + read_size,
543                                             read_size, label_read_size);
544                 if (rc)
545                         goto out_err;
546
547                 /* push read_size to next read offset */
548                 read_size += label_read_size;
549         }
550
551         dev_dbg(ndd->dev, "len: %zu rc: %d\n", offset, rc);
552 out_err:
553         return rc;
554 }
555
556 int nd_label_active_count(struct nvdimm_drvdata *ndd)
557 {
558         struct nd_namespace_index *nsindex;
559         unsigned long *free;
560         u32 nslot, slot;
561         int count = 0;
562
563         if (!preamble_current(ndd, &nsindex, &free, &nslot))
564                 return 0;
565
566         for_each_clear_bit_le(slot, free, nslot) {
567                 struct nd_namespace_label *nd_label;
568
569                 nd_label = to_label(ndd, slot);
570
571                 if (!slot_valid(ndd, nd_label, slot)) {
572                         u32 label_slot = nsl_get_slot(ndd, nd_label);
573                         u64 size = nsl_get_rawsize(ndd, nd_label);
574                         u64 dpa = nsl_get_dpa(ndd, nd_label);
575
576                         dev_dbg(ndd->dev,
577                                 "slot%d invalid slot: %d dpa: %llx size: %llx\n",
578                                         slot, label_slot, dpa, size);
579                         continue;
580                 }
581                 count++;
582         }
583         return count;
584 }
585
586 struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
587 {
588         struct nd_namespace_index *nsindex;
589         unsigned long *free;
590         u32 nslot, slot;
591
592         if (!preamble_current(ndd, &nsindex, &free, &nslot))
593                 return NULL;
594
595         for_each_clear_bit_le(slot, free, nslot) {
596                 struct nd_namespace_label *nd_label;
597
598                 nd_label = to_label(ndd, slot);
599                 if (!slot_valid(ndd, nd_label, slot))
600                         continue;
601
602                 if (n-- == 0)
603                         return to_label(ndd, slot);
604         }
605
606         return NULL;
607 }
608
609 u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd)
610 {
611         struct nd_namespace_index *nsindex;
612         unsigned long *free;
613         u32 nslot, slot;
614
615         if (!preamble_next(ndd, &nsindex, &free, &nslot))
616                 return UINT_MAX;
617
618         WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
619
620         slot = find_next_bit_le(free, nslot, 0);
621         if (slot == nslot)
622                 return UINT_MAX;
623
624         clear_bit_le(slot, free);
625
626         return slot;
627 }
628
629 bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot)
630 {
631         struct nd_namespace_index *nsindex;
632         unsigned long *free;
633         u32 nslot;
634
635         if (!preamble_next(ndd, &nsindex, &free, &nslot))
636                 return false;
637
638         WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
639
640         if (slot < nslot)
641                 return !test_and_set_bit_le(slot, free);
642         return false;
643 }
644
645 u32 nd_label_nfree(struct nvdimm_drvdata *ndd)
646 {
647         struct nd_namespace_index *nsindex;
648         unsigned long *free;
649         u32 nslot;
650
651         WARN_ON(!is_nvdimm_bus_locked(ndd->dev));
652
653         if (!preamble_next(ndd, &nsindex, &free, &nslot))
654                 return nvdimm_num_label_slots(ndd);
655
656         return bitmap_weight(free, nslot);
657 }
658
659 static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq,
660                 unsigned long flags)
661 {
662         struct nd_namespace_index *nsindex;
663         unsigned long offset;
664         u64 checksum;
665         u32 nslot;
666         int rc;
667
668         nsindex = to_namespace_index(ndd, index);
669         if (flags & ND_NSINDEX_INIT)
670                 nslot = nvdimm_num_label_slots(ndd);
671         else
672                 nslot = __le32_to_cpu(nsindex->nslot);
673
674         memcpy(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN);
675         memset(&nsindex->flags, 0, 3);
676         nsindex->labelsize = sizeof_namespace_label(ndd) >> 8;
677         nsindex->seq = __cpu_to_le32(seq);
678         offset = (unsigned long) nsindex
679                 - (unsigned long) to_namespace_index(ndd, 0);
680         nsindex->myoff = __cpu_to_le64(offset);
681         nsindex->mysize = __cpu_to_le64(sizeof_namespace_index(ndd));
682         offset = (unsigned long) to_namespace_index(ndd,
683                         nd_label_next_nsindex(index))
684                 - (unsigned long) to_namespace_index(ndd, 0);
685         nsindex->otheroff = __cpu_to_le64(offset);
686         offset = (unsigned long) nd_label_base(ndd)
687                 - (unsigned long) to_namespace_index(ndd, 0);
688         nsindex->labeloff = __cpu_to_le64(offset);
689         nsindex->nslot = __cpu_to_le32(nslot);
690         nsindex->major = __cpu_to_le16(1);
691         if (sizeof_namespace_label(ndd) < 256)
692                 nsindex->minor = __cpu_to_le16(1);
693         else
694                 nsindex->minor = __cpu_to_le16(2);
695         nsindex->checksum = __cpu_to_le64(0);
696         if (flags & ND_NSINDEX_INIT) {
697                 unsigned long *free = (unsigned long *) nsindex->free;
698                 u32 nfree = ALIGN(nslot, BITS_PER_LONG);
699                 int last_bits, i;
700
701                 memset(nsindex->free, 0xff, nfree / 8);
702                 for (i = 0, last_bits = nfree - nslot; i < last_bits; i++)
703                         clear_bit_le(nslot + i, free);
704         }
705         checksum = nd_fletcher64(nsindex, sizeof_namespace_index(ndd), 1);
706         nsindex->checksum = __cpu_to_le64(checksum);
707         rc = nvdimm_set_config_data(ndd, __le64_to_cpu(nsindex->myoff),
708                         nsindex, sizeof_namespace_index(ndd));
709         if (rc < 0)
710                 return rc;
711
712         if (flags & ND_NSINDEX_INIT)
713                 return 0;
714
715         /* copy the index we just wrote to the new 'next' */
716         WARN_ON(index != ndd->ns_next);
717         nd_label_copy(ndd, to_current_namespace_index(ndd), nsindex);
718         ndd->ns_current = nd_label_next_nsindex(ndd->ns_current);
719         ndd->ns_next = nd_label_next_nsindex(ndd->ns_next);
720         WARN_ON(ndd->ns_current == ndd->ns_next);
721
722         return 0;
723 }
724
725 static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
726                 struct nd_namespace_label *nd_label)
727 {
728         return (unsigned long) nd_label
729                 - (unsigned long) to_namespace_index(ndd, 0);
730 }
731
732 static enum nvdimm_claim_class guid_to_nvdimm_cclass(guid_t *guid)
733 {
734         if (guid_equal(guid, &nvdimm_btt_guid))
735                 return NVDIMM_CCLASS_BTT;
736         else if (guid_equal(guid, &nvdimm_btt2_guid))
737                 return NVDIMM_CCLASS_BTT2;
738         else if (guid_equal(guid, &nvdimm_pfn_guid))
739                 return NVDIMM_CCLASS_PFN;
740         else if (guid_equal(guid, &nvdimm_dax_guid))
741                 return NVDIMM_CCLASS_DAX;
742         else if (guid_equal(guid, &guid_null))
743                 return NVDIMM_CCLASS_NONE;
744
745         return NVDIMM_CCLASS_UNKNOWN;
746 }
747
748 /* CXL labels store UUIDs instead of GUIDs for the same data */
749 static enum nvdimm_claim_class uuid_to_nvdimm_cclass(uuid_t *uuid)
750 {
751         if (uuid_equal(uuid, &nvdimm_btt_uuid))
752                 return NVDIMM_CCLASS_BTT;
753         else if (uuid_equal(uuid, &nvdimm_btt2_uuid))
754                 return NVDIMM_CCLASS_BTT2;
755         else if (uuid_equal(uuid, &nvdimm_pfn_uuid))
756                 return NVDIMM_CCLASS_PFN;
757         else if (uuid_equal(uuid, &nvdimm_dax_uuid))
758                 return NVDIMM_CCLASS_DAX;
759         else if (uuid_equal(uuid, &uuid_null))
760                 return NVDIMM_CCLASS_NONE;
761
762         return NVDIMM_CCLASS_UNKNOWN;
763 }
764
765 static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class,
766         guid_t *target)
767 {
768         if (claim_class == NVDIMM_CCLASS_BTT)
769                 return &nvdimm_btt_guid;
770         else if (claim_class == NVDIMM_CCLASS_BTT2)
771                 return &nvdimm_btt2_guid;
772         else if (claim_class == NVDIMM_CCLASS_PFN)
773                 return &nvdimm_pfn_guid;
774         else if (claim_class == NVDIMM_CCLASS_DAX)
775                 return &nvdimm_dax_guid;
776         else if (claim_class == NVDIMM_CCLASS_UNKNOWN) {
777                 /*
778                  * If we're modifying a namespace for which we don't
779                  * know the claim_class, don't touch the existing guid.
780                  */
781                 return target;
782         } else
783                 return &guid_null;
784 }
785
786 /* CXL labels store UUIDs instead of GUIDs for the same data */
787 static const uuid_t *to_abstraction_uuid(enum nvdimm_claim_class claim_class,
788                                          uuid_t *target)
789 {
790         if (claim_class == NVDIMM_CCLASS_BTT)
791                 return &nvdimm_btt_uuid;
792         else if (claim_class == NVDIMM_CCLASS_BTT2)
793                 return &nvdimm_btt2_uuid;
794         else if (claim_class == NVDIMM_CCLASS_PFN)
795                 return &nvdimm_pfn_uuid;
796         else if (claim_class == NVDIMM_CCLASS_DAX)
797                 return &nvdimm_dax_uuid;
798         else if (claim_class == NVDIMM_CCLASS_UNKNOWN) {
799                 /*
800                  * If we're modifying a namespace for which we don't
801                  * know the claim_class, don't touch the existing uuid.
802                  */
803                 return target;
804         } else
805                 return &uuid_null;
806 }
807
808 static void reap_victim(struct nd_mapping *nd_mapping,
809                 struct nd_label_ent *victim)
810 {
811         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
812         u32 slot = to_slot(ndd, victim->label);
813
814         dev_dbg(ndd->dev, "free: %d\n", slot);
815         nd_label_free_slot(ndd, slot);
816         victim->label = NULL;
817 }
818
819 static void nsl_set_type_guid(struct nvdimm_drvdata *ndd,
820                               struct nd_namespace_label *nd_label, guid_t *guid)
821 {
822         if (efi_namespace_label_has(ndd, type_guid))
823                 guid_copy(&nd_label->efi.type_guid, guid);
824 }
825
826 bool nsl_validate_type_guid(struct nvdimm_drvdata *ndd,
827                             struct nd_namespace_label *nd_label, guid_t *guid)
828 {
829         if (ndd->cxl || !efi_namespace_label_has(ndd, type_guid))
830                 return true;
831         if (!guid_equal(&nd_label->efi.type_guid, guid)) {
832                 dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n", guid,
833                         &nd_label->efi.type_guid);
834                 return false;
835         }
836         return true;
837 }
838
839 static void nsl_set_claim_class(struct nvdimm_drvdata *ndd,
840                                 struct nd_namespace_label *nd_label,
841                                 enum nvdimm_claim_class claim_class)
842 {
843         if (ndd->cxl) {
844                 uuid_t uuid;
845
846                 import_uuid(&uuid, nd_label->cxl.abstraction_uuid);
847                 export_uuid(nd_label->cxl.abstraction_uuid,
848                             to_abstraction_uuid(claim_class, &uuid));
849                 return;
850         }
851
852         if (!efi_namespace_label_has(ndd, abstraction_guid))
853                 return;
854         guid_copy(&nd_label->efi.abstraction_guid,
855                   to_abstraction_guid(claim_class,
856                                       &nd_label->efi.abstraction_guid));
857 }
858
859 enum nvdimm_claim_class nsl_get_claim_class(struct nvdimm_drvdata *ndd,
860                                             struct nd_namespace_label *nd_label)
861 {
862         if (ndd->cxl) {
863                 uuid_t uuid;
864
865                 import_uuid(&uuid, nd_label->cxl.abstraction_uuid);
866                 return uuid_to_nvdimm_cclass(&uuid);
867         }
868         if (!efi_namespace_label_has(ndd, abstraction_guid))
869                 return NVDIMM_CCLASS_NONE;
870         return guid_to_nvdimm_cclass(&nd_label->efi.abstraction_guid);
871 }
872
873 static int __pmem_label_update(struct nd_region *nd_region,
874                 struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
875                 int pos, unsigned long flags)
876 {
877         struct nd_namespace_common *ndns = &nspm->nsio.common;
878         struct nd_interleave_set *nd_set = nd_region->nd_set;
879         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
880         struct nd_namespace_label *nd_label;
881         struct nd_namespace_index *nsindex;
882         struct nd_label_ent *label_ent;
883         struct nd_label_id label_id;
884         struct resource *res;
885         unsigned long *free;
886         u32 nslot, slot;
887         size_t offset;
888         u64 cookie;
889         int rc;
890
891         if (!preamble_next(ndd, &nsindex, &free, &nslot))
892                 return -ENXIO;
893
894         cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
895         nd_label_gen_id(&label_id, nspm->uuid, 0);
896         for_each_dpa_resource(ndd, res)
897                 if (strcmp(res->name, label_id.id) == 0)
898                         break;
899
900         if (!res) {
901                 WARN_ON_ONCE(1);
902                 return -ENXIO;
903         }
904
905         /* allocate and write the label to the staging (next) index */
906         slot = nd_label_alloc_slot(ndd);
907         if (slot == UINT_MAX)
908                 return -ENXIO;
909         dev_dbg(ndd->dev, "allocated: %d\n", slot);
910
911         nd_label = to_label(ndd, slot);
912         memset(nd_label, 0, sizeof_namespace_label(ndd));
913         nsl_set_uuid(ndd, nd_label, nspm->uuid);
914         nsl_set_name(ndd, nd_label, nspm->alt_name);
915         nsl_set_flags(ndd, nd_label, flags);
916         nsl_set_nlabel(ndd, nd_label, nd_region->ndr_mappings);
917         nsl_set_nrange(ndd, nd_label, 1);
918         nsl_set_position(ndd, nd_label, pos);
919         nsl_set_isetcookie(ndd, nd_label, cookie);
920         nsl_set_rawsize(ndd, nd_label, resource_size(res));
921         nsl_set_lbasize(ndd, nd_label, nspm->lbasize);
922         nsl_set_dpa(ndd, nd_label, res->start);
923         nsl_set_slot(ndd, nd_label, slot);
924         nsl_set_type_guid(ndd, nd_label, &nd_set->type_guid);
925         nsl_set_claim_class(ndd, nd_label, ndns->claim_class);
926         nsl_calculate_checksum(ndd, nd_label);
927         nd_dbg_dpa(nd_region, ndd, res, "\n");
928
929         /* update label */
930         offset = nd_label_offset(ndd, nd_label);
931         rc = nvdimm_set_config_data(ndd, offset, nd_label,
932                         sizeof_namespace_label(ndd));
933         if (rc < 0)
934                 return rc;
935
936         /* Garbage collect the previous label */
937         mutex_lock(&nd_mapping->lock);
938         list_for_each_entry(label_ent, &nd_mapping->labels, list) {
939                 if (!label_ent->label)
940                         continue;
941                 if (test_and_clear_bit(ND_LABEL_REAP, &label_ent->flags) ||
942                     nsl_uuid_equal(ndd, label_ent->label, nspm->uuid))
943                         reap_victim(nd_mapping, label_ent);
944         }
945
946         /* update index */
947         rc = nd_label_write_index(ndd, ndd->ns_next,
948                         nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
949         if (rc == 0) {
950                 list_for_each_entry(label_ent, &nd_mapping->labels, list)
951                         if (!label_ent->label) {
952                                 label_ent->label = nd_label;
953                                 nd_label = NULL;
954                                 break;
955                         }
956                 dev_WARN_ONCE(&nspm->nsio.common.dev, nd_label,
957                                 "failed to track label: %d\n",
958                                 to_slot(ndd, nd_label));
959                 if (nd_label)
960                         rc = -ENXIO;
961         }
962         mutex_unlock(&nd_mapping->lock);
963
964         return rc;
965 }
966
967 static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
968 {
969         int i, old_num_labels = 0;
970         struct nd_label_ent *label_ent;
971         struct nd_namespace_index *nsindex;
972         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
973
974         mutex_lock(&nd_mapping->lock);
975         list_for_each_entry(label_ent, &nd_mapping->labels, list)
976                 old_num_labels++;
977         mutex_unlock(&nd_mapping->lock);
978
979         /*
980          * We need to preserve all the old labels for the mapping so
981          * they can be garbage collected after writing the new labels.
982          */
983         for (i = old_num_labels; i < num_labels; i++) {
984                 label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
985                 if (!label_ent)
986                         return -ENOMEM;
987                 mutex_lock(&nd_mapping->lock);
988                 list_add_tail(&label_ent->list, &nd_mapping->labels);
989                 mutex_unlock(&nd_mapping->lock);
990         }
991
992         if (ndd->ns_current == -1 || ndd->ns_next == -1)
993                 /* pass */;
994         else
995                 return max(num_labels, old_num_labels);
996
997         nsindex = to_namespace_index(ndd, 0);
998         memset(nsindex, 0, ndd->nsarea.config_size);
999         for (i = 0; i < 2; i++) {
1000                 int rc = nd_label_write_index(ndd, i, 3 - i, ND_NSINDEX_INIT);
1001
1002                 if (rc)
1003                         return rc;
1004         }
1005         ndd->ns_next = 1;
1006         ndd->ns_current = 0;
1007
1008         return max(num_labels, old_num_labels);
1009 }
1010
1011 static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
1012 {
1013         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1014         struct nd_label_ent *label_ent, *e;
1015         struct nd_namespace_index *nsindex;
1016         unsigned long *free;
1017         LIST_HEAD(list);
1018         u32 nslot, slot;
1019         int active = 0;
1020
1021         if (!uuid)
1022                 return 0;
1023
1024         /* no index || no labels == nothing to delete */
1025         if (!preamble_next(ndd, &nsindex, &free, &nslot))
1026                 return 0;
1027
1028         mutex_lock(&nd_mapping->lock);
1029         list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
1030                 struct nd_namespace_label *nd_label = label_ent->label;
1031
1032                 if (!nd_label)
1033                         continue;
1034                 active++;
1035                 if (!nsl_uuid_equal(ndd, nd_label, uuid))
1036                         continue;
1037                 active--;
1038                 slot = to_slot(ndd, nd_label);
1039                 nd_label_free_slot(ndd, slot);
1040                 dev_dbg(ndd->dev, "free: %d\n", slot);
1041                 list_move_tail(&label_ent->list, &list);
1042                 label_ent->label = NULL;
1043         }
1044         list_splice_tail_init(&list, &nd_mapping->labels);
1045
1046         if (active == 0) {
1047                 nd_mapping_free_labels(nd_mapping);
1048                 dev_dbg(ndd->dev, "no more active labels\n");
1049         }
1050         mutex_unlock(&nd_mapping->lock);
1051
1052         return nd_label_write_index(ndd, ndd->ns_next,
1053                         nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
1054 }
1055
1056 int nd_pmem_namespace_label_update(struct nd_region *nd_region,
1057                 struct nd_namespace_pmem *nspm, resource_size_t size)
1058 {
1059         int i, rc;
1060
1061         for (i = 0; i < nd_region->ndr_mappings; i++) {
1062                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1063                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1064                 struct resource *res;
1065                 int count = 0;
1066
1067                 if (size == 0) {
1068                         rc = del_labels(nd_mapping, nspm->uuid);
1069                         if (rc)
1070                                 return rc;
1071                         continue;
1072                 }
1073
1074                 for_each_dpa_resource(ndd, res)
1075                         if (strncmp(res->name, "pmem", 4) == 0)
1076                                 count++;
1077                 WARN_ON_ONCE(!count);
1078
1079                 rc = init_labels(nd_mapping, count);
1080                 if (rc < 0)
1081                         return rc;
1082
1083                 rc = __pmem_label_update(nd_region, nd_mapping, nspm, i,
1084                                 NSLABEL_FLAG_UPDATING);
1085                 if (rc)
1086                         return rc;
1087         }
1088
1089         if (size == 0)
1090                 return 0;
1091
1092         /* Clear the UPDATING flag per UEFI 2.7 expectations */
1093         for (i = 0; i < nd_region->ndr_mappings; i++) {
1094                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1095
1096                 rc = __pmem_label_update(nd_region, nd_mapping, nspm, i, 0);
1097                 if (rc)
1098                         return rc;
1099         }
1100
1101         return 0;
1102 }
1103
1104 int __init nd_label_init(void)
1105 {
1106         WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
1107         WARN_ON(guid_parse(NVDIMM_BTT2_GUID, &nvdimm_btt2_guid));
1108         WARN_ON(guid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_guid));
1109         WARN_ON(guid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_guid));
1110
1111         WARN_ON(uuid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_uuid));
1112         WARN_ON(uuid_parse(NVDIMM_BTT2_GUID, &nvdimm_btt2_uuid));
1113         WARN_ON(uuid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_uuid));
1114         WARN_ON(uuid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_uuid));
1115
1116         WARN_ON(uuid_parse(CXL_REGION_UUID, &cxl_region_uuid));
1117         WARN_ON(uuid_parse(CXL_NAMESPACE_UUID, &cxl_namespace_uuid));
1118
1119         return 0;
1120 }