1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6 #include <linux/moduleparam.h>
7 #include <linux/vmalloc.h>
8 #include <linux/device.h>
9 #include <linux/ndctl.h>
10 #include <linux/slab.h>
19 static DEFINE_IDA(dimm_ida);
22 module_param(noblk, bool, 0444);
23 MODULE_PARM_DESC(noblk, "force disable BLK / local alias support");
26 * Retrieve bus and dimm handle and return if this bus supports
27 * get_config_data commands
29 int nvdimm_check_config_data(struct device *dev)
31 struct nvdimm *nvdimm = to_nvdimm(dev);
33 if (!nvdimm->cmd_mask ||
34 !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
35 if (test_bit(NDD_ALIASING, &nvdimm->flags))
44 static int validate_dimm(struct nvdimm_drvdata *ndd)
51 rc = nvdimm_check_config_data(ndd->dev);
53 dev_dbg(ndd->dev, "%ps: %s error: %d\n",
54 __builtin_return_address(0), __func__, rc);
59 * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
60 * @nvdimm: dimm to initialize
62 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
64 struct nd_cmd_get_config_size *cmd = &ndd->nsarea;
65 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
66 struct nvdimm_bus_descriptor *nd_desc;
67 int rc = validate_dimm(ndd);
74 return 0; /* already valid */
76 memset(cmd, 0, sizeof(*cmd));
77 nd_desc = nvdimm_bus->nd_desc;
78 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
79 ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc);
85 int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
86 size_t offset, size_t len)
88 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
89 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
90 int rc = validate_dimm(ndd), cmd_rc = 0;
91 struct nd_cmd_get_config_data_hdr *cmd;
92 size_t max_cmd_size, buf_offset;
97 if (offset + len > ndd->nsarea.config_size)
100 max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
101 cmd = kvzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
105 for (buf_offset = 0; len;
106 len -= cmd->in_length, buf_offset += cmd->in_length) {
109 cmd->in_offset = offset + buf_offset;
110 cmd->in_length = min(max_cmd_size, len);
112 cmd_size = sizeof(*cmd) + cmd->in_length;
114 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
115 ND_CMD_GET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
123 /* out_buf should be valid, copy it into our output buffer */
124 memcpy(buf + buf_offset, cmd->out_buf, cmd->in_length);
131 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
132 void *buf, size_t len)
134 size_t max_cmd_size, buf_offset;
135 struct nd_cmd_set_config_hdr *cmd;
136 int rc = validate_dimm(ndd), cmd_rc = 0;
137 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
138 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
143 if (offset + len > ndd->nsarea.config_size)
146 max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
147 cmd = kvzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
151 for (buf_offset = 0; len; len -= cmd->in_length,
152 buf_offset += cmd->in_length) {
155 cmd->in_offset = offset + buf_offset;
156 cmd->in_length = min(max_cmd_size, len);
157 memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);
159 /* status is output in the last 4-bytes of the command buffer */
160 cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
162 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
163 ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
176 void nvdimm_set_aliasing(struct device *dev)
178 struct nvdimm *nvdimm = to_nvdimm(dev);
180 set_bit(NDD_ALIASING, &nvdimm->flags);
183 void nvdimm_set_locked(struct device *dev)
185 struct nvdimm *nvdimm = to_nvdimm(dev);
187 set_bit(NDD_LOCKED, &nvdimm->flags);
190 void nvdimm_clear_locked(struct device *dev)
192 struct nvdimm *nvdimm = to_nvdimm(dev);
194 clear_bit(NDD_LOCKED, &nvdimm->flags);
197 static void nvdimm_release(struct device *dev)
199 struct nvdimm *nvdimm = to_nvdimm(dev);
201 ida_simple_remove(&dimm_ida, nvdimm->id);
205 static struct device_type nvdimm_device_type = {
207 .release = nvdimm_release,
210 bool is_nvdimm(struct device *dev)
212 return dev->type == &nvdimm_device_type;
215 struct nvdimm *to_nvdimm(struct device *dev)
217 struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
219 WARN_ON(!is_nvdimm(dev));
222 EXPORT_SYMBOL_GPL(to_nvdimm);
224 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr)
226 struct nd_region *nd_region = &ndbr->nd_region;
227 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
229 return nd_mapping->nvdimm;
231 EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm);
233 unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr)
235 /* pmem mapping properties are private to libnvdimm */
236 return ARCH_MEMREMAP_PMEM;
238 EXPORT_SYMBOL_GPL(nd_blk_memremap_flags);
240 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
242 struct nvdimm *nvdimm = nd_mapping->nvdimm;
244 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
246 return dev_get_drvdata(&nvdimm->dev);
248 EXPORT_SYMBOL(to_ndd);
250 void nvdimm_drvdata_release(struct kref *kref)
252 struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref);
253 struct device *dev = ndd->dev;
254 struct resource *res, *_r;
256 dev_dbg(dev, "trace\n");
257 nvdimm_bus_lock(dev);
258 for_each_dpa_resource_safe(ndd, res, _r)
259 nvdimm_free_dpa(ndd, res);
260 nvdimm_bus_unlock(dev);
267 void get_ndd(struct nvdimm_drvdata *ndd)
269 kref_get(&ndd->kref);
272 void put_ndd(struct nvdimm_drvdata *ndd)
275 kref_put(&ndd->kref, nvdimm_drvdata_release);
278 const char *nvdimm_name(struct nvdimm *nvdimm)
280 return dev_name(&nvdimm->dev);
282 EXPORT_SYMBOL_GPL(nvdimm_name);
284 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm)
286 return &nvdimm->dev.kobj;
288 EXPORT_SYMBOL_GPL(nvdimm_kobj);
290 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm)
292 return nvdimm->cmd_mask;
294 EXPORT_SYMBOL_GPL(nvdimm_cmd_mask);
296 void *nvdimm_provider_data(struct nvdimm *nvdimm)
299 return nvdimm->provider_data;
302 EXPORT_SYMBOL_GPL(nvdimm_provider_data);
304 static ssize_t commands_show(struct device *dev,
305 struct device_attribute *attr, char *buf)
307 struct nvdimm *nvdimm = to_nvdimm(dev);
310 if (!nvdimm->cmd_mask)
311 return sprintf(buf, "\n");
313 for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG)
314 len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd));
315 len += sprintf(buf + len, "\n");
318 static DEVICE_ATTR_RO(commands);
320 static ssize_t flags_show(struct device *dev,
321 struct device_attribute *attr, char *buf)
323 struct nvdimm *nvdimm = to_nvdimm(dev);
325 return sprintf(buf, "%s%s\n",
326 test_bit(NDD_ALIASING, &nvdimm->flags) ? "alias " : "",
327 test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : "");
329 static DEVICE_ATTR_RO(flags);
331 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
334 struct nvdimm *nvdimm = to_nvdimm(dev);
337 * The state may be in the process of changing, userspace should
338 * quiesce probing if it wants a static answer
340 nvdimm_bus_lock(dev);
341 nvdimm_bus_unlock(dev);
342 return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy)
343 ? "active" : "idle");
345 static DEVICE_ATTR_RO(state);
347 static ssize_t available_slots_show(struct device *dev,
348 struct device_attribute *attr, char *buf)
350 struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
357 nvdimm_bus_lock(dev);
358 nfree = nd_label_nfree(ndd);
359 if (nfree - 1 > nfree) {
360 dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
364 rc = sprintf(buf, "%d\n", nfree);
365 nvdimm_bus_unlock(dev);
368 static DEVICE_ATTR_RO(available_slots);
370 __weak ssize_t security_show(struct device *dev,
371 struct device_attribute *attr, char *buf)
373 struct nvdimm *nvdimm = to_nvdimm(dev);
375 switch (nvdimm->sec.state) {
376 case NVDIMM_SECURITY_DISABLED:
377 return sprintf(buf, "disabled\n");
378 case NVDIMM_SECURITY_UNLOCKED:
379 return sprintf(buf, "unlocked\n");
380 case NVDIMM_SECURITY_LOCKED:
381 return sprintf(buf, "locked\n");
382 case NVDIMM_SECURITY_FROZEN:
383 return sprintf(buf, "frozen\n");
384 case NVDIMM_SECURITY_OVERWRITE:
385 return sprintf(buf, "overwrite\n");
394 C( OP_FREEZE, "freeze", 1), \
395 C( OP_DISABLE, "disable", 2), \
396 C( OP_UPDATE, "update", 3), \
397 C( OP_ERASE, "erase", 2), \
398 C( OP_OVERWRITE, "overwrite", 2), \
399 C( OP_MASTER_UPDATE, "master_update", 3), \
400 C( OP_MASTER_ERASE, "master_erase", 2)
403 enum nvdimmsec_op_ids { OPS };
405 #define C(a, b, c) { b, c }
412 #define SEC_CMD_SIZE 32
413 #define KEY_ID_SIZE 10
415 static ssize_t __security_store(struct device *dev, const char *buf, size_t len)
417 struct nvdimm *nvdimm = to_nvdimm(dev);
419 char cmd[SEC_CMD_SIZE+1], keystr[KEY_ID_SIZE+1],
420 nkeystr[KEY_ID_SIZE+1];
421 unsigned int key, newkey;
424 if (atomic_read(&nvdimm->busy))
427 rc = sscanf(buf, "%"__stringify(SEC_CMD_SIZE)"s"
428 " %"__stringify(KEY_ID_SIZE)"s"
429 " %"__stringify(KEY_ID_SIZE)"s",
430 cmd, keystr, nkeystr);
433 for (i = 0; i < ARRAY_SIZE(ops); i++)
434 if (sysfs_streq(cmd, ops[i].name))
436 if (i >= ARRAY_SIZE(ops))
439 rc = kstrtouint(keystr, 0, &key);
440 if (rc >= 0 && ops[i].args > 2)
441 rc = kstrtouint(nkeystr, 0, &newkey);
445 if (i == OP_FREEZE) {
446 dev_dbg(dev, "freeze\n");
447 rc = nvdimm_security_freeze(nvdimm);
448 } else if (i == OP_DISABLE) {
449 dev_dbg(dev, "disable %u\n", key);
450 rc = nvdimm_security_disable(nvdimm, key);
451 } else if (i == OP_UPDATE) {
452 dev_dbg(dev, "update %u %u\n", key, newkey);
453 rc = nvdimm_security_update(nvdimm, key, newkey, NVDIMM_USER);
454 } else if (i == OP_ERASE) {
455 dev_dbg(dev, "erase %u\n", key);
456 rc = nvdimm_security_erase(nvdimm, key, NVDIMM_USER);
457 } else if (i == OP_OVERWRITE) {
458 dev_dbg(dev, "overwrite %u\n", key);
459 rc = nvdimm_security_overwrite(nvdimm, key);
460 } else if (i == OP_MASTER_UPDATE) {
461 dev_dbg(dev, "master_update %u %u\n", key, newkey);
462 rc = nvdimm_security_update(nvdimm, key, newkey,
464 } else if (i == OP_MASTER_ERASE) {
465 dev_dbg(dev, "master_erase %u\n", key);
466 rc = nvdimm_security_erase(nvdimm, key,
476 static ssize_t security_store(struct device *dev,
477 struct device_attribute *attr, const char *buf, size_t len)
483 * Require all userspace triggered security management to be
484 * done while probing is idle and the DIMM is not in active use
488 nvdimm_bus_lock(dev);
489 wait_nvdimm_bus_probe_idle(dev);
490 rc = __security_store(dev, buf, len);
491 nvdimm_bus_unlock(dev);
492 nd_device_unlock(dev);
496 static DEVICE_ATTR_RW(security);
498 static struct attribute *nvdimm_attributes[] = {
499 &dev_attr_state.attr,
500 &dev_attr_flags.attr,
501 &dev_attr_commands.attr,
502 &dev_attr_available_slots.attr,
503 &dev_attr_security.attr,
507 static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
509 struct device *dev = container_of(kobj, typeof(*dev), kobj);
510 struct nvdimm *nvdimm = to_nvdimm(dev);
512 if (a != &dev_attr_security.attr)
514 if (nvdimm->sec.state < 0)
516 /* Are there any state mutation ops? */
517 if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable
518 || nvdimm->sec.ops->change_key
519 || nvdimm->sec.ops->erase
520 || nvdimm->sec.ops->overwrite)
525 struct attribute_group nvdimm_attribute_group = {
526 .attrs = nvdimm_attributes,
527 .is_visible = nvdimm_visible,
529 EXPORT_SYMBOL_GPL(nvdimm_attribute_group);
531 struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
532 void *provider_data, const struct attribute_group **groups,
533 unsigned long flags, unsigned long cmd_mask, int num_flush,
534 struct resource *flush_wpq, const char *dimm_id,
535 const struct nvdimm_security_ops *sec_ops)
537 struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
543 nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
544 if (nvdimm->id < 0) {
549 nvdimm->dimm_id = dimm_id;
550 nvdimm->provider_data = provider_data;
552 flags |= 1 << NDD_NOBLK;
553 nvdimm->flags = flags;
554 nvdimm->cmd_mask = cmd_mask;
555 nvdimm->num_flush = num_flush;
556 nvdimm->flush_wpq = flush_wpq;
557 atomic_set(&nvdimm->busy, 0);
559 dev_set_name(dev, "nmem%d", nvdimm->id);
560 dev->parent = &nvdimm_bus->dev;
561 dev->type = &nvdimm_device_type;
562 dev->devt = MKDEV(nvdimm_major, nvdimm->id);
563 dev->groups = groups;
564 nvdimm->sec.ops = sec_ops;
565 nvdimm->sec.overwrite_tmo = 0;
566 INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query);
568 * Security state must be initialized before device_add() for
569 * attribute visibility.
571 /* get security state and extended (master) state */
572 nvdimm->sec.state = nvdimm_security_state(nvdimm, NVDIMM_USER);
573 nvdimm->sec.ext_state = nvdimm_security_state(nvdimm, NVDIMM_MASTER);
574 nd_device_register(dev);
578 EXPORT_SYMBOL_GPL(__nvdimm_create);
580 static void shutdown_security_notify(void *data)
582 struct nvdimm *nvdimm = data;
584 sysfs_put(nvdimm->sec.overwrite_state);
587 int nvdimm_security_setup_events(struct device *dev)
589 struct nvdimm *nvdimm = to_nvdimm(dev);
591 if (nvdimm->sec.state < 0 || !nvdimm->sec.ops
592 || !nvdimm->sec.ops->overwrite)
594 nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security");
595 if (!nvdimm->sec.overwrite_state)
598 return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm);
600 EXPORT_SYMBOL_GPL(nvdimm_security_setup_events);
602 int nvdimm_in_overwrite(struct nvdimm *nvdimm)
604 return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags);
606 EXPORT_SYMBOL_GPL(nvdimm_in_overwrite);
608 int nvdimm_security_freeze(struct nvdimm *nvdimm)
612 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
614 if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze)
617 if (nvdimm->sec.state < 0)
620 if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) {
621 dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n");
625 rc = nvdimm->sec.ops->freeze(nvdimm);
626 nvdimm->sec.state = nvdimm_security_state(nvdimm, NVDIMM_USER);
631 int alias_dpa_busy(struct device *dev, void *data)
633 resource_size_t map_end, blk_start, new;
634 struct blk_alloc_info *info = data;
635 struct nd_mapping *nd_mapping;
636 struct nd_region *nd_region;
637 struct nvdimm_drvdata *ndd;
638 struct resource *res;
644 nd_region = to_nd_region(dev);
645 for (i = 0; i < nd_region->ndr_mappings; i++) {
646 nd_mapping = &nd_region->mapping[i];
647 if (nd_mapping->nvdimm == info->nd_mapping->nvdimm)
651 if (i >= nd_region->ndr_mappings)
654 ndd = to_ndd(nd_mapping);
655 map_end = nd_mapping->start + nd_mapping->size - 1;
656 blk_start = nd_mapping->start;
659 * In the allocation case ->res is set to free space that we are
660 * looking to validate against PMEM aliasing collision rules
661 * (i.e. BLK is allocated after all aliased PMEM).
664 if (info->res->start >= nd_mapping->start
665 && info->res->start < map_end)
673 * Find the free dpa from the end of the last pmem allocation to
674 * the end of the interleave-set mapping.
676 for_each_dpa_resource(ndd, res) {
677 if (strncmp(res->name, "pmem", 4) != 0)
679 if ((res->start >= blk_start && res->start < map_end)
680 || (res->end >= blk_start
681 && res->end <= map_end)) {
682 new = max(blk_start, min(map_end + 1, res->end + 1));
683 if (new != blk_start) {
690 /* update the free space range with the probed blk_start */
691 if (info->res && blk_start > info->res->start) {
692 info->res->start = max(info->res->start, blk_start);
693 if (info->res->start > info->res->end)
694 info->res->end = info->res->start - 1;
698 info->available -= blk_start - nd_mapping->start;
704 * nd_blk_available_dpa - account the unused dpa of BLK region
705 * @nd_mapping: container of dpa-resource-root + labels
707 * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges, but
708 * we arrange for them to never start at an lower dpa than the last
709 * PMEM allocation in an aliased region.
711 resource_size_t nd_blk_available_dpa(struct nd_region *nd_region)
713 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
714 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
715 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
716 struct blk_alloc_info info = {
717 .nd_mapping = nd_mapping,
718 .available = nd_mapping->size,
721 struct resource *res;
726 device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
728 /* now account for busy blk allocations in unaliased dpa */
729 for_each_dpa_resource(ndd, res) {
730 if (strncmp(res->name, "blk", 3) != 0)
732 info.available -= resource_size(res);
735 return info.available;
739 * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
740 * contiguous unallocated dpa range.
741 * @nd_region: constrain available space check to this reference region
742 * @nd_mapping: container of dpa-resource-root + labels
744 resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
745 struct nd_mapping *nd_mapping)
747 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
748 struct nvdimm_bus *nvdimm_bus;
749 resource_size_t max = 0;
750 struct resource *res;
752 /* if a dimm is disabled the available capacity is zero */
756 nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
757 if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm))
759 for_each_dpa_resource(ndd, res) {
760 if (strcmp(res->name, "pmem-reserve") != 0)
762 if (resource_size(res) > max)
763 max = resource_size(res);
765 release_free_pmem(nvdimm_bus, nd_mapping);
770 * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
771 * @nd_mapping: container of dpa-resource-root + labels
772 * @nd_region: constrain available space check to this reference region
773 * @overlap: calculate available space assuming this level of overlap
775 * Validate that a PMEM label, if present, aligns with the start of an
776 * interleave set and truncate the available size at the lowest BLK
779 * The expectation is that this routine is called multiple times as it
780 * probes for the largest BLK encroachment for any single member DIMM of
781 * the interleave set. Once that value is determined the PMEM-limit for
782 * the set can be established.
784 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
785 struct nd_mapping *nd_mapping, resource_size_t *overlap)
787 resource_size_t map_start, map_end, busy = 0, available, blk_start;
788 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
789 struct resource *res;
795 map_start = nd_mapping->start;
796 map_end = map_start + nd_mapping->size - 1;
797 blk_start = max(map_start, map_end + 1 - *overlap);
798 for_each_dpa_resource(ndd, res) {
799 if (res->start >= map_start && res->start < map_end) {
800 if (strncmp(res->name, "blk", 3) == 0)
801 blk_start = min(blk_start,
802 max(map_start, res->start));
803 else if (res->end > map_end) {
804 reason = "misaligned to iset";
807 busy += resource_size(res);
808 } else if (res->end >= map_start && res->end <= map_end) {
809 if (strncmp(res->name, "blk", 3) == 0) {
811 * If a BLK allocation overlaps the start of
812 * PMEM the entire interleave set may now only
815 blk_start = map_start;
817 busy += resource_size(res);
818 } else if (map_start > res->start && map_start < res->end) {
819 /* total eclipse of the mapping */
820 busy += nd_mapping->size;
821 blk_start = map_start;
825 *overlap = map_end + 1 - blk_start;
826 available = blk_start - map_start;
827 if (busy < available)
828 return available - busy;
832 nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason);
836 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
838 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
840 __release_region(&ndd->dpa, res->start, resource_size(res));
843 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
844 struct nd_label_id *label_id, resource_size_t start,
847 char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
848 struct resource *res;
853 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
854 res = __request_region(&ndd->dpa, start, n, name, 0);
861 * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
862 * @nvdimm: container of dpa-resource-root + labels
863 * @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid>
865 resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
866 struct nd_label_id *label_id)
868 resource_size_t allocated = 0;
869 struct resource *res;
871 for_each_dpa_resource(ndd, res)
872 if (strcmp(res->name, label_id->id) == 0)
873 allocated += resource_size(res);
878 static int count_dimms(struct device *dev, void *c)
887 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
890 /* Flush any possible dimm registration failures */
893 device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
894 dev_dbg(&nvdimm_bus->dev, "count: %d\n", count);
895 if (count != dimm_count)
899 EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count);
901 void __exit nvdimm_devs_exit(void)
903 ida_destroy(&dimm_ida);