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_LABELING, &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_labeling(struct device *dev)
178 struct nvdimm *nvdimm = to_nvdimm(dev);
180 set_bit(NDD_LABELING, &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 struct nvdimm *to_nvdimm(struct device *dev)
207 struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
209 WARN_ON(!is_nvdimm(dev));
212 EXPORT_SYMBOL_GPL(to_nvdimm);
214 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr)
216 struct nd_region *nd_region = &ndbr->nd_region;
217 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
219 return nd_mapping->nvdimm;
221 EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm);
223 unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr)
225 /* pmem mapping properties are private to libnvdimm */
226 return ARCH_MEMREMAP_PMEM;
228 EXPORT_SYMBOL_GPL(nd_blk_memremap_flags);
230 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
232 struct nvdimm *nvdimm = nd_mapping->nvdimm;
234 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
236 return dev_get_drvdata(&nvdimm->dev);
238 EXPORT_SYMBOL(to_ndd);
240 void nvdimm_drvdata_release(struct kref *kref)
242 struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref);
243 struct device *dev = ndd->dev;
244 struct resource *res, *_r;
246 dev_dbg(dev, "trace\n");
247 nvdimm_bus_lock(dev);
248 for_each_dpa_resource_safe(ndd, res, _r)
249 nvdimm_free_dpa(ndd, res);
250 nvdimm_bus_unlock(dev);
257 void get_ndd(struct nvdimm_drvdata *ndd)
259 kref_get(&ndd->kref);
262 void put_ndd(struct nvdimm_drvdata *ndd)
265 kref_put(&ndd->kref, nvdimm_drvdata_release);
268 const char *nvdimm_name(struct nvdimm *nvdimm)
270 return dev_name(&nvdimm->dev);
272 EXPORT_SYMBOL_GPL(nvdimm_name);
274 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm)
276 return &nvdimm->dev.kobj;
278 EXPORT_SYMBOL_GPL(nvdimm_kobj);
280 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm)
282 return nvdimm->cmd_mask;
284 EXPORT_SYMBOL_GPL(nvdimm_cmd_mask);
286 void *nvdimm_provider_data(struct nvdimm *nvdimm)
289 return nvdimm->provider_data;
292 EXPORT_SYMBOL_GPL(nvdimm_provider_data);
294 static ssize_t commands_show(struct device *dev,
295 struct device_attribute *attr, char *buf)
297 struct nvdimm *nvdimm = to_nvdimm(dev);
300 if (!nvdimm->cmd_mask)
301 return sprintf(buf, "\n");
303 for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG)
304 len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd));
305 len += sprintf(buf + len, "\n");
308 static DEVICE_ATTR_RO(commands);
310 static ssize_t flags_show(struct device *dev,
311 struct device_attribute *attr, char *buf)
313 struct nvdimm *nvdimm = to_nvdimm(dev);
315 return sprintf(buf, "%s%s%s\n",
316 test_bit(NDD_ALIASING, &nvdimm->flags) ? "alias " : "",
317 test_bit(NDD_LABELING, &nvdimm->flags) ? "label " : "",
318 test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : "");
320 static DEVICE_ATTR_RO(flags);
322 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
325 struct nvdimm *nvdimm = to_nvdimm(dev);
328 * The state may be in the process of changing, userspace should
329 * quiesce probing if it wants a static answer
331 nvdimm_bus_lock(dev);
332 nvdimm_bus_unlock(dev);
333 return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy)
334 ? "active" : "idle");
336 static DEVICE_ATTR_RO(state);
338 static ssize_t __available_slots_show(struct nvdimm_drvdata *ndd, char *buf)
348 nvdimm_bus_lock(dev);
349 nfree = nd_label_nfree(ndd);
350 if (nfree - 1 > nfree) {
351 dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
355 rc = sprintf(buf, "%d\n", nfree);
356 nvdimm_bus_unlock(dev);
360 static ssize_t available_slots_show(struct device *dev,
361 struct device_attribute *attr, char *buf)
366 rc = __available_slots_show(dev_get_drvdata(dev), buf);
367 nd_device_unlock(dev);
371 static DEVICE_ATTR_RO(available_slots);
373 __weak ssize_t security_show(struct device *dev,
374 struct device_attribute *attr, char *buf)
376 struct nvdimm *nvdimm = to_nvdimm(dev);
378 if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags))
379 return sprintf(buf, "overwrite\n");
380 if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags))
381 return sprintf(buf, "disabled\n");
382 if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags))
383 return sprintf(buf, "unlocked\n");
384 if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags))
385 return sprintf(buf, "locked\n");
389 static ssize_t frozen_show(struct device *dev,
390 struct device_attribute *attr, char *buf)
392 struct nvdimm *nvdimm = to_nvdimm(dev);
394 return sprintf(buf, "%d\n", test_bit(NVDIMM_SECURITY_FROZEN,
395 &nvdimm->sec.flags));
397 static DEVICE_ATTR_RO(frozen);
399 static ssize_t security_store(struct device *dev,
400 struct device_attribute *attr, const char *buf, size_t len)
406 * Require all userspace triggered security management to be
407 * done while probing is idle and the DIMM is not in active use
411 nvdimm_bus_lock(dev);
412 wait_nvdimm_bus_probe_idle(dev);
413 rc = nvdimm_security_store(dev, buf, len);
414 nvdimm_bus_unlock(dev);
415 nd_device_unlock(dev);
419 static DEVICE_ATTR_RW(security);
421 static struct attribute *nvdimm_attributes[] = {
422 &dev_attr_state.attr,
423 &dev_attr_flags.attr,
424 &dev_attr_commands.attr,
425 &dev_attr_available_slots.attr,
426 &dev_attr_security.attr,
427 &dev_attr_frozen.attr,
431 static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
433 struct device *dev = container_of(kobj, typeof(*dev), kobj);
434 struct nvdimm *nvdimm = to_nvdimm(dev);
436 if (a != &dev_attr_security.attr && a != &dev_attr_frozen.attr)
438 if (!nvdimm->sec.flags)
441 if (a == &dev_attr_security.attr) {
442 /* Are there any state mutation ops (make writable)? */
443 if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable
444 || nvdimm->sec.ops->change_key
445 || nvdimm->sec.ops->erase
446 || nvdimm->sec.ops->overwrite)
451 if (nvdimm->sec.ops->freeze)
456 static const struct attribute_group nvdimm_attribute_group = {
457 .attrs = nvdimm_attributes,
458 .is_visible = nvdimm_visible,
461 static ssize_t result_show(struct device *dev, struct device_attribute *attr, char *buf)
463 struct nvdimm *nvdimm = to_nvdimm(dev);
464 enum nvdimm_fwa_result result;
469 nvdimm_bus_lock(dev);
470 result = nvdimm->fw_ops->activate_result(nvdimm);
471 nvdimm_bus_unlock(dev);
474 case NVDIMM_FWA_RESULT_NONE:
475 return sprintf(buf, "none\n");
476 case NVDIMM_FWA_RESULT_SUCCESS:
477 return sprintf(buf, "success\n");
478 case NVDIMM_FWA_RESULT_FAIL:
479 return sprintf(buf, "fail\n");
480 case NVDIMM_FWA_RESULT_NOTSTAGED:
481 return sprintf(buf, "not_staged\n");
482 case NVDIMM_FWA_RESULT_NEEDRESET:
483 return sprintf(buf, "need_reset\n");
488 static DEVICE_ATTR_ADMIN_RO(result);
490 static ssize_t activate_show(struct device *dev, struct device_attribute *attr, char *buf)
492 struct nvdimm *nvdimm = to_nvdimm(dev);
493 enum nvdimm_fwa_state state;
498 nvdimm_bus_lock(dev);
499 state = nvdimm->fw_ops->activate_state(nvdimm);
500 nvdimm_bus_unlock(dev);
503 case NVDIMM_FWA_IDLE:
504 return sprintf(buf, "idle\n");
505 case NVDIMM_FWA_BUSY:
506 return sprintf(buf, "busy\n");
507 case NVDIMM_FWA_ARMED:
508 return sprintf(buf, "armed\n");
514 static ssize_t activate_store(struct device *dev, struct device_attribute *attr,
515 const char *buf, size_t len)
517 struct nvdimm *nvdimm = to_nvdimm(dev);
518 enum nvdimm_fwa_trigger arg;
524 if (sysfs_streq(buf, "arm"))
525 arg = NVDIMM_FWA_ARM;
526 else if (sysfs_streq(buf, "disarm"))
527 arg = NVDIMM_FWA_DISARM;
531 nvdimm_bus_lock(dev);
532 rc = nvdimm->fw_ops->arm(nvdimm, arg);
533 nvdimm_bus_unlock(dev);
539 static DEVICE_ATTR_ADMIN_RW(activate);
541 static struct attribute *nvdimm_firmware_attributes[] = {
542 &dev_attr_activate.attr,
543 &dev_attr_result.attr,
547 static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
549 struct device *dev = container_of(kobj, typeof(*dev), kobj);
550 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
551 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
552 struct nvdimm *nvdimm = to_nvdimm(dev);
553 enum nvdimm_fwa_capability cap;
555 if (!nd_desc->fw_ops)
560 nvdimm_bus_lock(dev);
561 cap = nd_desc->fw_ops->capability(nd_desc);
562 nvdimm_bus_unlock(dev);
564 if (cap < NVDIMM_FWA_CAP_QUIESCE)
570 static const struct attribute_group nvdimm_firmware_attribute_group = {
572 .attrs = nvdimm_firmware_attributes,
573 .is_visible = nvdimm_firmware_visible,
576 static const struct attribute_group *nvdimm_attribute_groups[] = {
577 &nd_device_attribute_group,
578 &nvdimm_attribute_group,
579 &nvdimm_firmware_attribute_group,
583 static const struct device_type nvdimm_device_type = {
585 .release = nvdimm_release,
586 .groups = nvdimm_attribute_groups,
589 bool is_nvdimm(struct device *dev)
591 return dev->type == &nvdimm_device_type;
594 struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
595 void *provider_data, const struct attribute_group **groups,
596 unsigned long flags, unsigned long cmd_mask, int num_flush,
597 struct resource *flush_wpq, const char *dimm_id,
598 const struct nvdimm_security_ops *sec_ops,
599 const struct nvdimm_fw_ops *fw_ops)
601 struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
607 nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
608 if (nvdimm->id < 0) {
613 nvdimm->dimm_id = dimm_id;
614 nvdimm->provider_data = provider_data;
616 flags |= 1 << NDD_NOBLK;
617 nvdimm->flags = flags;
618 nvdimm->cmd_mask = cmd_mask;
619 nvdimm->num_flush = num_flush;
620 nvdimm->flush_wpq = flush_wpq;
621 atomic_set(&nvdimm->busy, 0);
623 dev_set_name(dev, "nmem%d", nvdimm->id);
624 dev->parent = &nvdimm_bus->dev;
625 dev->type = &nvdimm_device_type;
626 dev->devt = MKDEV(nvdimm_major, nvdimm->id);
627 dev->groups = groups;
628 nvdimm->sec.ops = sec_ops;
629 nvdimm->fw_ops = fw_ops;
630 nvdimm->sec.overwrite_tmo = 0;
631 INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query);
633 * Security state must be initialized before device_add() for
634 * attribute visibility.
636 /* get security state and extended (master) state */
637 nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
638 nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER);
639 nd_device_register(dev);
643 EXPORT_SYMBOL_GPL(__nvdimm_create);
645 static void shutdown_security_notify(void *data)
647 struct nvdimm *nvdimm = data;
649 sysfs_put(nvdimm->sec.overwrite_state);
652 int nvdimm_security_setup_events(struct device *dev)
654 struct nvdimm *nvdimm = to_nvdimm(dev);
656 if (!nvdimm->sec.flags || !nvdimm->sec.ops
657 || !nvdimm->sec.ops->overwrite)
659 nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security");
660 if (!nvdimm->sec.overwrite_state)
663 return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm);
665 EXPORT_SYMBOL_GPL(nvdimm_security_setup_events);
667 int nvdimm_in_overwrite(struct nvdimm *nvdimm)
669 return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags);
671 EXPORT_SYMBOL_GPL(nvdimm_in_overwrite);
673 int nvdimm_security_freeze(struct nvdimm *nvdimm)
677 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
679 if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze)
682 if (!nvdimm->sec.flags)
685 if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) {
686 dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n");
690 rc = nvdimm->sec.ops->freeze(nvdimm);
691 nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
696 static unsigned long dpa_align(struct nd_region *nd_region)
698 struct device *dev = &nd_region->dev;
700 if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev),
701 "bus lock required for capacity provision\n"))
703 if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align
704 % nd_region->ndr_mappings,
705 "invalid region align %#lx mappings: %d\n",
706 nd_region->align, nd_region->ndr_mappings))
708 return nd_region->align / nd_region->ndr_mappings;
711 int alias_dpa_busy(struct device *dev, void *data)
713 resource_size_t map_end, blk_start, new;
714 struct blk_alloc_info *info = data;
715 struct nd_mapping *nd_mapping;
716 struct nd_region *nd_region;
717 struct nvdimm_drvdata *ndd;
718 struct resource *res;
725 nd_region = to_nd_region(dev);
726 for (i = 0; i < nd_region->ndr_mappings; i++) {
727 nd_mapping = &nd_region->mapping[i];
728 if (nd_mapping->nvdimm == info->nd_mapping->nvdimm)
732 if (i >= nd_region->ndr_mappings)
735 ndd = to_ndd(nd_mapping);
736 map_end = nd_mapping->start + nd_mapping->size - 1;
737 blk_start = nd_mapping->start;
740 * In the allocation case ->res is set to free space that we are
741 * looking to validate against PMEM aliasing collision rules
742 * (i.e. BLK is allocated after all aliased PMEM).
745 if (info->res->start >= nd_mapping->start
746 && info->res->start < map_end)
754 * Find the free dpa from the end of the last pmem allocation to
755 * the end of the interleave-set mapping.
757 align = dpa_align(nd_region);
761 for_each_dpa_resource(ndd, res) {
762 resource_size_t start, end;
764 if (strncmp(res->name, "pmem", 4) != 0)
767 start = ALIGN_DOWN(res->start, align);
768 end = ALIGN(res->end + 1, align) - 1;
769 if ((start >= blk_start && start < map_end)
770 || (end >= blk_start && end <= map_end)) {
771 new = max(blk_start, min(map_end, end) + 1);
772 if (new != blk_start) {
779 /* update the free space range with the probed blk_start */
780 if (info->res && blk_start > info->res->start) {
781 info->res->start = max(info->res->start, blk_start);
782 if (info->res->start > info->res->end)
783 info->res->end = info->res->start - 1;
787 info->available -= blk_start - nd_mapping->start;
793 * nd_blk_available_dpa - account the unused dpa of BLK region
794 * @nd_mapping: container of dpa-resource-root + labels
796 * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges, but
797 * we arrange for them to never start at an lower dpa than the last
798 * PMEM allocation in an aliased region.
800 resource_size_t nd_blk_available_dpa(struct nd_region *nd_region)
802 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
803 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
804 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
805 struct blk_alloc_info info = {
806 .nd_mapping = nd_mapping,
807 .available = nd_mapping->size,
810 struct resource *res;
816 device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
818 /* now account for busy blk allocations in unaliased dpa */
819 align = dpa_align(nd_region);
822 for_each_dpa_resource(ndd, res) {
823 resource_size_t start, end, size;
825 if (strncmp(res->name, "blk", 3) != 0)
827 start = ALIGN_DOWN(res->start, align);
828 end = ALIGN(res->end + 1, align) - 1;
829 size = end - start + 1;
830 if (size >= info.available)
832 info.available -= size;
835 return info.available;
839 * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
840 * contiguous unallocated dpa range.
841 * @nd_region: constrain available space check to this reference region
842 * @nd_mapping: container of dpa-resource-root + labels
844 resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
845 struct nd_mapping *nd_mapping)
847 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
848 struct nvdimm_bus *nvdimm_bus;
849 resource_size_t max = 0;
850 struct resource *res;
853 /* if a dimm is disabled the available capacity is zero */
857 align = dpa_align(nd_region);
861 nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
862 if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm))
864 for_each_dpa_resource(ndd, res) {
865 resource_size_t start, end;
867 if (strcmp(res->name, "pmem-reserve") != 0)
869 /* trim free space relative to current alignment setting */
870 start = ALIGN(res->start, align);
871 end = ALIGN_DOWN(res->end + 1, align) - 1;
874 if (end - start + 1 > max)
875 max = end - start + 1;
877 release_free_pmem(nvdimm_bus, nd_mapping);
882 * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
883 * @nd_mapping: container of dpa-resource-root + labels
884 * @nd_region: constrain available space check to this reference region
885 * @overlap: calculate available space assuming this level of overlap
887 * Validate that a PMEM label, if present, aligns with the start of an
888 * interleave set and truncate the available size at the lowest BLK
891 * The expectation is that this routine is called multiple times as it
892 * probes for the largest BLK encroachment for any single member DIMM of
893 * the interleave set. Once that value is determined the PMEM-limit for
894 * the set can be established.
896 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
897 struct nd_mapping *nd_mapping, resource_size_t *overlap)
899 resource_size_t map_start, map_end, busy = 0, available, blk_start;
900 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
901 struct resource *res;
908 align = dpa_align(nd_region);
912 map_start = nd_mapping->start;
913 map_end = map_start + nd_mapping->size - 1;
914 blk_start = max(map_start, map_end + 1 - *overlap);
915 for_each_dpa_resource(ndd, res) {
916 resource_size_t start, end;
918 start = ALIGN_DOWN(res->start, align);
919 end = ALIGN(res->end + 1, align) - 1;
920 if (start >= map_start && start < map_end) {
921 if (strncmp(res->name, "blk", 3) == 0)
922 blk_start = min(blk_start,
923 max(map_start, start));
924 else if (end > map_end) {
925 reason = "misaligned to iset";
928 busy += end - start + 1;
929 } else if (end >= map_start && end <= map_end) {
930 if (strncmp(res->name, "blk", 3) == 0) {
932 * If a BLK allocation overlaps the start of
933 * PMEM the entire interleave set may now only
936 blk_start = map_start;
938 busy += end - start + 1;
939 } else if (map_start > start && map_start < end) {
940 /* total eclipse of the mapping */
941 busy += nd_mapping->size;
942 blk_start = map_start;
946 *overlap = map_end + 1 - blk_start;
947 available = blk_start - map_start;
948 if (busy < available)
949 return ALIGN_DOWN(available - busy, align);
953 nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason);
957 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
959 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
961 __release_region(&ndd->dpa, res->start, resource_size(res));
964 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
965 struct nd_label_id *label_id, resource_size_t start,
968 char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
969 struct resource *res;
974 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
975 res = __request_region(&ndd->dpa, start, n, name, 0);
982 * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
983 * @nvdimm: container of dpa-resource-root + labels
984 * @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid>
986 resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
987 struct nd_label_id *label_id)
989 resource_size_t allocated = 0;
990 struct resource *res;
992 for_each_dpa_resource(ndd, res)
993 if (strcmp(res->name, label_id->id) == 0)
994 allocated += resource_size(res);
999 static int count_dimms(struct device *dev, void *c)
1008 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
1011 /* Flush any possible dimm registration failures */
1014 device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
1015 dev_dbg(&nvdimm_bus->dev, "count: %d\n", count);
1016 if (count != dimm_count)
1020 EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count);
1022 void __exit nvdimm_devs_exit(void)
1024 ida_destroy(&dimm_ida);