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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/nvdimm/label.c
....@@ -1,14 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * 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.
124  */
135 #include <linux/device.h>
146 #include <linux/ndctl.h>
....@@ -77,7 +69,8 @@
7769 	/*
7870 	 * Per UEFI 2.7, the minimum size of the Label Storage Area is large
7971 	 * enough to hold 2 index blocks and 2 labels.  The minimum index
80
-	 * block size is 256 bytes, and the minimum label size is 256 bytes.
72
+	 * block size is 256 bytes. The label size is 128 for namespaces
73
+	 * prior to version 1.2 and at minimum 256 for version 1.2 and later.
8174 	 */
8275 	nslot = nvdimm_num_label_slots(ndd);
8376 	space = ndd->nsarea.config_size - nslot * sizeof_namespace_label(ndd);
....@@ -185,6 +178,13 @@
185178 					__le64_to_cpu(nsindex[i]->otheroff));
186179 			continue;
187180 		}
181
+		if (__le64_to_cpu(nsindex[i]->labeloff)
182
+				!= 2 * sizeof_namespace_index(ndd)) {
183
+			dev_dbg(dev, "nsindex%d labeloff: %#llx invalid\n",
184
+					i, (unsigned long long)
185
+					__le64_to_cpu(nsindex[i]->labeloff));
186
+			continue;
187
+		}
188188 
189189 		size = __le64_to_cpu(nsindex[i]->mysize);
190190 		if (size > sizeof_namespace_index(ndd)
....@@ -229,7 +229,7 @@
229229 	return -1;
230230 }
231231 
232
-int nd_label_validate(struct nvdimm_drvdata *ndd)
232
+static int nd_label_validate(struct nvdimm_drvdata *ndd)
233233 {
234234 	/*
235235 	 * In order to probe for and validate namespace index blocks we
....@@ -252,12 +252,12 @@
252252 	return -1;
253253 }
254254 
255
-void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst,
256
-		struct nd_namespace_index *src)
255
+static void nd_label_copy(struct nvdimm_drvdata *ndd,
256
+			  struct nd_namespace_index *dst,
257
+			  struct nd_namespace_index *src)
257258 {
258
-	if (dst && src)
259
-		/* pass */;
260
-	else
259
+	/* just exit if either destination or source is NULL */
260
+	if (!dst || !src)
261261 		return;
262262 
263263 	memcpy(dst, src, sizeof_namespace_index(ndd));
....@@ -353,11 +353,6 @@
353353 	if (slot != __le32_to_cpu(nd_label->slot))
354354 		return false;
355355 
356
-	/* check that DPA allocations are page aligned */
357
-	if ((__le64_to_cpu(nd_label->dpa)
358
-				| __le64_to_cpu(nd_label->rawsize)) % SZ_4K)
359
-		return false;
360
-
361356 	/* check checksum */
362357 	if (namespace_label_has(ndd, checksum)) {
363358 		u64 sum, sum_save;
....@@ -386,6 +381,7 @@
386381 		return 0; /* no label, nothing to reserve */
387382 
388383 	for_each_clear_bit_le(slot, free, nslot) {
384
+		struct nvdimm *nvdimm = to_nvdimm(ndd->dev);
389385 		struct nd_namespace_label *nd_label;
390386 		struct nd_region *nd_region = NULL;
391387 		u8 label_uuid[NSLABEL_UUID_LEN];
....@@ -400,6 +396,8 @@
400396 
401397 		memcpy(label_uuid, nd_label->uuid, NSLABEL_UUID_LEN);
402398 		flags = __le32_to_cpu(nd_label->flags);
399
+		if (test_bit(NDD_NOBLK, &nvdimm->flags))
400
+			flags &= ~NSLABEL_FLAG_LOCAL;
403401 		nd_label_gen_id(&label_id, label_uuid, flags);
404402 		res = nvdimm_allocate_dpa(ndd, &label_id,
405403 				__le64_to_cpu(nd_label->dpa),
....@@ -410,6 +408,128 @@
410408 	}
411409 
412410 	return 0;
411
+}
412
+
413
+int nd_label_data_init(struct nvdimm_drvdata *ndd)
414
+{
415
+	size_t config_size, read_size, max_xfer, offset;
416
+	struct nd_namespace_index *nsindex;
417
+	unsigned int i;
418
+	int rc = 0;
419
+	u32 nslot;
420
+
421
+	if (ndd->data)
422
+		return 0;
423
+
424
+	if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0) {
425
+		dev_dbg(ndd->dev, "failed to init config data area: (%u:%u)\n",
426
+			ndd->nsarea.max_xfer, ndd->nsarea.config_size);
427
+		return -ENXIO;
428
+	}
429
+
430
+	/*
431
+	 * We need to determine the maximum index area as this is the section
432
+	 * we must read and validate before we can start processing labels.
433
+	 *
434
+	 * If the area is too small to contain the two indexes and 2 labels
435
+	 * then we abort.
436
+	 *
437
+	 * Start at a label size of 128 as this should result in the largest
438
+	 * possible namespace index size.
439
+	 */
440
+	ndd->nslabel_size = 128;
441
+	read_size = sizeof_namespace_index(ndd) * 2;
442
+	if (!read_size)
443
+		return -ENXIO;
444
+
445
+	/* Allocate config data */
446
+	config_size = ndd->nsarea.config_size;
447
+	ndd->data = kvzalloc(config_size, GFP_KERNEL);
448
+	if (!ndd->data)
449
+		return -ENOMEM;
450
+
451
+	/*
452
+	 * We want to guarantee as few reads as possible while conserving
453
+	 * memory. To do that we figure out how much unused space will be left
454
+	 * in the last read, divide that by the total number of reads it is
455
+	 * going to take given our maximum transfer size, and then reduce our
456
+	 * maximum transfer size based on that result.
457
+	 */
458
+	max_xfer = min_t(size_t, ndd->nsarea.max_xfer, config_size);
459
+	if (read_size < max_xfer) {
460
+		/* trim waste */
461
+		max_xfer -= ((max_xfer - 1) - (config_size - 1) % max_xfer) /
462
+			    DIV_ROUND_UP(config_size, max_xfer);
463
+		/* make certain we read indexes in exactly 1 read */
464
+		if (max_xfer < read_size)
465
+			max_xfer = read_size;
466
+	}
467
+
468
+	/* Make our initial read size a multiple of max_xfer size */
469
+	read_size = min(DIV_ROUND_UP(read_size, max_xfer) * max_xfer,
470
+			config_size);
471
+
472
+	/* Read the index data */
473
+	rc = nvdimm_get_config_data(ndd, ndd->data, 0, read_size);
474
+	if (rc)
475
+		goto out_err;
476
+
477
+	/* Validate index data, if not valid assume all labels are invalid */
478
+	ndd->ns_current = nd_label_validate(ndd);
479
+	if (ndd->ns_current < 0)
480
+		return 0;
481
+
482
+	/* Record our index values */
483
+	ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
484
+
485
+	/* Copy "current" index on top of the "next" index */
486
+	nsindex = to_current_namespace_index(ndd);
487
+	nd_label_copy(ndd, to_next_namespace_index(ndd), nsindex);
488
+
489
+	/* Determine starting offset for label data */
490
+	offset = __le64_to_cpu(nsindex->labeloff);
491
+	nslot = __le32_to_cpu(nsindex->nslot);
492
+
493
+	/* Loop through the free list pulling in any active labels */
494
+	for (i = 0; i < nslot; i++, offset += ndd->nslabel_size) {
495
+		size_t label_read_size;
496
+
497
+		/* zero out the unused labels */
498
+		if (test_bit_le(i, nsindex->free)) {
499
+			memset(ndd->data + offset, 0, ndd->nslabel_size);
500
+			continue;
501
+		}
502
+
503
+		/* if we already read past here then just continue */
504
+		if (offset + ndd->nslabel_size <= read_size)
505
+			continue;
506
+
507
+		/* if we haven't read in a while reset our read_size offset */
508
+		if (read_size < offset)
509
+			read_size = offset;
510
+
511
+		/* determine how much more will be read after this next call. */
512
+		label_read_size = offset + ndd->nslabel_size - read_size;
513
+		label_read_size = DIV_ROUND_UP(label_read_size, max_xfer) *
514
+				  max_xfer;
515
+
516
+		/* truncate last read if needed */
517
+		if (read_size + label_read_size > config_size)
518
+			label_read_size = config_size - read_size;
519
+
520
+		/* Read the label data */
521
+		rc = nvdimm_get_config_data(ndd, ndd->data + read_size,
522
+					    read_size, label_read_size);
523
+		if (rc)
524
+			goto out_err;
525
+
526
+		/* push read_size to next read offset */
527
+		read_size += label_read_size;
528
+	}
529
+
530
+	dev_dbg(ndd->dev, "len: %zu rc: %d\n", offset, rc);
531
+out_err:
532
+	return rc;
413533 }
414534 
415535 int nd_label_active_count(struct nvdimm_drvdata *ndd)
....@@ -819,8 +939,7 @@
819939 	victims = 0;
820940 	if (old_num_resources) {
821941 		/* convert old local-label-map to dimm-slot victim-map */
822
-		victim_map = kcalloc(BITS_TO_LONGS(nslot), sizeof(long),
823
-				GFP_KERNEL);
942
+		victim_map = bitmap_zalloc(nslot, GFP_KERNEL);
824943 		if (!victim_map)
825944 			return -ENOMEM;
826945 
....@@ -843,7 +962,7 @@
843962 	/* don't allow updates that consume the last label */
844963 	if (nfree - alloc < 0 || nfree - alloc + victims < 1) {
845964 		dev_info(&nsblk->common.dev, "insufficient label space\n");
846
-		kfree(victim_map);
965
+		bitmap_free(victim_map);
847966 		return -ENOSPC;
848967 	}
849968 	/* from here on we need to abort on error */
....@@ -1026,7 +1145,7 @@
10261145 
10271146  out:
10281147 	kfree(old_res_list);
1029
-	kfree(victim_map);
1148
+	bitmap_free(victim_map);
10301149 	return rc;
10311150 
10321151  abort: