2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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.
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.
13 #include <linux/scatterlist.h>
14 #include <linux/highmem.h>
15 #include <linux/sched.h>
16 #include <linux/slab.h>
17 #include <linux/hash.h>
18 #include <linux/pmem.h>
19 #include <linux/sort.h>
26 * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
29 #include <linux/io-64-nonatomic-hi-lo.h>
31 static DEFINE_IDA(region_ida);
32 static DEFINE_PER_CPU(int, flush_idx);
34 static int nvdimm_map_flush(struct device *dev, struct nvdimm *nvdimm, int dimm,
35 struct nd_region_data *ndrd)
39 dev_dbg(dev, "%s: map %d flush address%s\n", nvdimm_name(nvdimm),
40 nvdimm->num_flush, nvdimm->num_flush == 1 ? "" : "es");
41 for (i = 0; i < (1 << ndrd->hints_shift); i++) {
42 struct resource *res = &nvdimm->flush_wpq[i];
43 unsigned long pfn = PHYS_PFN(res->start);
44 void __iomem *flush_page;
46 /* check if flush hints share a page */
47 for (j = 0; j < i; j++) {
48 struct resource *res_j = &nvdimm->flush_wpq[j];
49 unsigned long pfn_j = PHYS_PFN(res_j->start);
56 flush_page = (void __iomem *) ((unsigned long)
57 ndrd_get_flush_wpq(ndrd, dimm, j)
60 flush_page = devm_nvdimm_ioremap(dev,
61 PFN_PHYS(pfn), PAGE_SIZE);
64 ndrd_set_flush_wpq(ndrd, dimm, i, flush_page
65 + (res->start & ~PAGE_MASK));
71 int nd_region_activate(struct nd_region *nd_region)
74 struct nd_region_data *ndrd;
75 struct device *dev = &nd_region->dev;
76 size_t flush_data_size = sizeof(void *);
78 nvdimm_bus_lock(&nd_region->dev);
79 for (i = 0; i < nd_region->ndr_mappings; i++) {
80 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
81 struct nvdimm *nvdimm = nd_mapping->nvdimm;
83 /* at least one null hint slot per-dimm for the "no-hint" case */
84 flush_data_size += sizeof(void *);
85 num_flush = min_not_zero(num_flush, nvdimm->num_flush);
86 if (!nvdimm->num_flush)
88 flush_data_size += nvdimm->num_flush * sizeof(void *);
90 nvdimm_bus_unlock(&nd_region->dev);
92 ndrd = devm_kzalloc(dev, sizeof(*ndrd) + flush_data_size, GFP_KERNEL);
95 dev_set_drvdata(dev, ndrd);
100 ndrd->hints_shift = ilog2(num_flush);
101 for (i = 0; i < nd_region->ndr_mappings; i++) {
102 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
103 struct nvdimm *nvdimm = nd_mapping->nvdimm;
104 int rc = nvdimm_map_flush(&nd_region->dev, nvdimm, i, ndrd);
113 static void nd_region_release(struct device *dev)
115 struct nd_region *nd_region = to_nd_region(dev);
118 for (i = 0; i < nd_region->ndr_mappings; i++) {
119 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
120 struct nvdimm *nvdimm = nd_mapping->nvdimm;
122 put_device(&nvdimm->dev);
124 free_percpu(nd_region->lane);
125 ida_simple_remove(®ion_ida, nd_region->id);
127 kfree(to_nd_blk_region(dev));
132 static struct device_type nd_blk_device_type = {
134 .release = nd_region_release,
137 static struct device_type nd_pmem_device_type = {
139 .release = nd_region_release,
142 static struct device_type nd_volatile_device_type = {
143 .name = "nd_volatile",
144 .release = nd_region_release,
147 bool is_nd_pmem(struct device *dev)
149 return dev ? dev->type == &nd_pmem_device_type : false;
152 bool is_nd_blk(struct device *dev)
154 return dev ? dev->type == &nd_blk_device_type : false;
157 struct nd_region *to_nd_region(struct device *dev)
159 struct nd_region *nd_region = container_of(dev, struct nd_region, dev);
161 WARN_ON(dev->type->release != nd_region_release);
164 EXPORT_SYMBOL_GPL(to_nd_region);
166 struct nd_blk_region *to_nd_blk_region(struct device *dev)
168 struct nd_region *nd_region = to_nd_region(dev);
170 WARN_ON(!is_nd_blk(dev));
171 return container_of(nd_region, struct nd_blk_region, nd_region);
173 EXPORT_SYMBOL_GPL(to_nd_blk_region);
175 void *nd_region_provider_data(struct nd_region *nd_region)
177 return nd_region->provider_data;
179 EXPORT_SYMBOL_GPL(nd_region_provider_data);
181 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr)
183 return ndbr->blk_provider_data;
185 EXPORT_SYMBOL_GPL(nd_blk_region_provider_data);
187 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data)
189 ndbr->blk_provider_data = data;
191 EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data);
194 * nd_region_to_nstype() - region to an integer namespace type
195 * @nd_region: region-device to interrogate
197 * This is the 'nstype' attribute of a region as well, an input to the
198 * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match
199 * namespace devices with namespace drivers.
201 int nd_region_to_nstype(struct nd_region *nd_region)
203 if (is_nd_pmem(&nd_region->dev)) {
206 for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) {
207 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
208 struct nvdimm *nvdimm = nd_mapping->nvdimm;
210 if (nvdimm->flags & NDD_ALIASING)
214 return ND_DEVICE_NAMESPACE_PMEM;
216 return ND_DEVICE_NAMESPACE_IO;
217 } else if (is_nd_blk(&nd_region->dev)) {
218 return ND_DEVICE_NAMESPACE_BLK;
223 EXPORT_SYMBOL(nd_region_to_nstype);
225 static ssize_t size_show(struct device *dev,
226 struct device_attribute *attr, char *buf)
228 struct nd_region *nd_region = to_nd_region(dev);
229 unsigned long long size = 0;
231 if (is_nd_pmem(dev)) {
232 size = nd_region->ndr_size;
233 } else if (nd_region->ndr_mappings == 1) {
234 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
236 size = nd_mapping->size;
239 return sprintf(buf, "%llu\n", size);
241 static DEVICE_ATTR_RO(size);
243 static ssize_t mappings_show(struct device *dev,
244 struct device_attribute *attr, char *buf)
246 struct nd_region *nd_region = to_nd_region(dev);
248 return sprintf(buf, "%d\n", nd_region->ndr_mappings);
250 static DEVICE_ATTR_RO(mappings);
252 static ssize_t nstype_show(struct device *dev,
253 struct device_attribute *attr, char *buf)
255 struct nd_region *nd_region = to_nd_region(dev);
257 return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
259 static DEVICE_ATTR_RO(nstype);
261 static ssize_t set_cookie_show(struct device *dev,
262 struct device_attribute *attr, char *buf)
264 struct nd_region *nd_region = to_nd_region(dev);
265 struct nd_interleave_set *nd_set = nd_region->nd_set;
267 if (is_nd_pmem(dev) && nd_set)
268 /* pass, should be precluded by region_visible */;
272 return sprintf(buf, "%#llx\n", nd_set->cookie);
274 static DEVICE_ATTR_RO(set_cookie);
276 resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
278 resource_size_t blk_max_overlap = 0, available, overlap;
281 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
285 overlap = blk_max_overlap;
286 for (i = 0; i < nd_region->ndr_mappings; i++) {
287 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
288 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
290 /* if a dimm is disabled the available capacity is zero */
294 if (is_nd_pmem(&nd_region->dev)) {
295 available += nd_pmem_available_dpa(nd_region,
296 nd_mapping, &overlap);
297 if (overlap > blk_max_overlap) {
298 blk_max_overlap = overlap;
301 } else if (is_nd_blk(&nd_region->dev)) {
302 available += nd_blk_available_dpa(nd_mapping);
309 static ssize_t available_size_show(struct device *dev,
310 struct device_attribute *attr, char *buf)
312 struct nd_region *nd_region = to_nd_region(dev);
313 unsigned long long available = 0;
316 * Flush in-flight updates and grab a snapshot of the available
317 * size. Of course, this value is potentially invalidated the
318 * memory nvdimm_bus_lock() is dropped, but that's userspace's
319 * problem to not race itself.
321 nvdimm_bus_lock(dev);
322 wait_nvdimm_bus_probe_idle(dev);
323 available = nd_region_available_dpa(nd_region);
324 nvdimm_bus_unlock(dev);
326 return sprintf(buf, "%llu\n", available);
328 static DEVICE_ATTR_RO(available_size);
330 static ssize_t init_namespaces_show(struct device *dev,
331 struct device_attribute *attr, char *buf)
333 struct nd_region_data *ndrd = dev_get_drvdata(dev);
336 nvdimm_bus_lock(dev);
338 rc = sprintf(buf, "%d/%d\n", ndrd->ns_active, ndrd->ns_count);
341 nvdimm_bus_unlock(dev);
345 static DEVICE_ATTR_RO(init_namespaces);
347 static ssize_t namespace_seed_show(struct device *dev,
348 struct device_attribute *attr, char *buf)
350 struct nd_region *nd_region = to_nd_region(dev);
353 nvdimm_bus_lock(dev);
354 if (nd_region->ns_seed)
355 rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed));
357 rc = sprintf(buf, "\n");
358 nvdimm_bus_unlock(dev);
361 static DEVICE_ATTR_RO(namespace_seed);
363 static ssize_t btt_seed_show(struct device *dev,
364 struct device_attribute *attr, char *buf)
366 struct nd_region *nd_region = to_nd_region(dev);
369 nvdimm_bus_lock(dev);
370 if (nd_region->btt_seed)
371 rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed));
373 rc = sprintf(buf, "\n");
374 nvdimm_bus_unlock(dev);
378 static DEVICE_ATTR_RO(btt_seed);
380 static ssize_t pfn_seed_show(struct device *dev,
381 struct device_attribute *attr, char *buf)
383 struct nd_region *nd_region = to_nd_region(dev);
386 nvdimm_bus_lock(dev);
387 if (nd_region->pfn_seed)
388 rc = sprintf(buf, "%s\n", dev_name(nd_region->pfn_seed));
390 rc = sprintf(buf, "\n");
391 nvdimm_bus_unlock(dev);
395 static DEVICE_ATTR_RO(pfn_seed);
397 static ssize_t dax_seed_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
400 struct nd_region *nd_region = to_nd_region(dev);
403 nvdimm_bus_lock(dev);
404 if (nd_region->dax_seed)
405 rc = sprintf(buf, "%s\n", dev_name(nd_region->dax_seed));
407 rc = sprintf(buf, "\n");
408 nvdimm_bus_unlock(dev);
412 static DEVICE_ATTR_RO(dax_seed);
414 static ssize_t read_only_show(struct device *dev,
415 struct device_attribute *attr, char *buf)
417 struct nd_region *nd_region = to_nd_region(dev);
419 return sprintf(buf, "%d\n", nd_region->ro);
422 static ssize_t read_only_store(struct device *dev,
423 struct device_attribute *attr, const char *buf, size_t len)
426 int rc = strtobool(buf, &ro);
427 struct nd_region *nd_region = to_nd_region(dev);
435 static DEVICE_ATTR_RW(read_only);
437 static struct attribute *nd_region_attributes[] = {
439 &dev_attr_nstype.attr,
440 &dev_attr_mappings.attr,
441 &dev_attr_btt_seed.attr,
442 &dev_attr_pfn_seed.attr,
443 &dev_attr_dax_seed.attr,
444 &dev_attr_read_only.attr,
445 &dev_attr_set_cookie.attr,
446 &dev_attr_available_size.attr,
447 &dev_attr_namespace_seed.attr,
448 &dev_attr_init_namespaces.attr,
452 static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
454 struct device *dev = container_of(kobj, typeof(*dev), kobj);
455 struct nd_region *nd_region = to_nd_region(dev);
456 struct nd_interleave_set *nd_set = nd_region->nd_set;
457 int type = nd_region_to_nstype(nd_region);
459 if (!is_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr)
462 if (!is_nd_pmem(dev) && a == &dev_attr_dax_seed.attr)
465 if (a != &dev_attr_set_cookie.attr
466 && a != &dev_attr_available_size.attr)
469 if ((type == ND_DEVICE_NAMESPACE_PMEM
470 || type == ND_DEVICE_NAMESPACE_BLK)
471 && a == &dev_attr_available_size.attr)
473 else if (is_nd_pmem(dev) && nd_set)
479 struct attribute_group nd_region_attribute_group = {
480 .attrs = nd_region_attributes,
481 .is_visible = region_visible,
483 EXPORT_SYMBOL_GPL(nd_region_attribute_group);
485 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
487 struct nd_interleave_set *nd_set = nd_region->nd_set;
490 return nd_set->cookie;
495 * Upon successful probe/remove, take/release a reference on the
496 * associated interleave set (if present), and plant new btt + namespace
497 * seeds. Also, on the removal of a BLK region, notify the provider to
498 * disable the region.
500 static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
501 struct device *dev, bool probe)
503 struct nd_region *nd_region;
505 if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) {
508 nd_region = to_nd_region(dev);
509 for (i = 0; i < nd_region->ndr_mappings; i++) {
510 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
511 struct nvdimm_drvdata *ndd = nd_mapping->ndd;
512 struct nvdimm *nvdimm = nd_mapping->nvdimm;
514 kfree(nd_mapping->labels);
515 nd_mapping->labels = NULL;
517 nd_mapping->ndd = NULL;
519 atomic_dec(&nvdimm->busy);
525 if (dev->parent && is_nd_blk(dev->parent) && probe) {
526 nd_region = to_nd_region(dev->parent);
527 nvdimm_bus_lock(dev);
528 if (nd_region->ns_seed == dev)
529 nd_region_create_blk_seed(nd_region);
530 nvdimm_bus_unlock(dev);
532 if (is_nd_btt(dev) && probe) {
533 struct nd_btt *nd_btt = to_nd_btt(dev);
535 nd_region = to_nd_region(dev->parent);
536 nvdimm_bus_lock(dev);
537 if (nd_region->btt_seed == dev)
538 nd_region_create_btt_seed(nd_region);
539 if (nd_region->ns_seed == &nd_btt->ndns->dev &&
540 is_nd_blk(dev->parent))
541 nd_region_create_blk_seed(nd_region);
542 nvdimm_bus_unlock(dev);
544 if (is_nd_pfn(dev) && probe) {
545 nd_region = to_nd_region(dev->parent);
546 nvdimm_bus_lock(dev);
547 if (nd_region->pfn_seed == dev)
548 nd_region_create_pfn_seed(nd_region);
549 nvdimm_bus_unlock(dev);
551 if (is_nd_dax(dev) && probe) {
552 nd_region = to_nd_region(dev->parent);
553 nvdimm_bus_lock(dev);
554 if (nd_region->dax_seed == dev)
555 nd_region_create_dax_seed(nd_region);
556 nvdimm_bus_unlock(dev);
560 void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
562 nd_region_notify_driver_action(nvdimm_bus, dev, true);
565 void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
567 nd_region_notify_driver_action(nvdimm_bus, dev, false);
570 static ssize_t mappingN(struct device *dev, char *buf, int n)
572 struct nd_region *nd_region = to_nd_region(dev);
573 struct nd_mapping *nd_mapping;
574 struct nvdimm *nvdimm;
576 if (n >= nd_region->ndr_mappings)
578 nd_mapping = &nd_region->mapping[n];
579 nvdimm = nd_mapping->nvdimm;
581 return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev),
582 nd_mapping->start, nd_mapping->size);
585 #define REGION_MAPPING(idx) \
586 static ssize_t mapping##idx##_show(struct device *dev, \
587 struct device_attribute *attr, char *buf) \
589 return mappingN(dev, buf, idx); \
591 static DEVICE_ATTR_RO(mapping##idx)
594 * 32 should be enough for a while, even in the presence of socket
595 * interleave a 32-way interleave set is a degenerate case.
630 static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n)
632 struct device *dev = container_of(kobj, struct device, kobj);
633 struct nd_region *nd_region = to_nd_region(dev);
635 if (n < nd_region->ndr_mappings)
640 static struct attribute *mapping_attributes[] = {
641 &dev_attr_mapping0.attr,
642 &dev_attr_mapping1.attr,
643 &dev_attr_mapping2.attr,
644 &dev_attr_mapping3.attr,
645 &dev_attr_mapping4.attr,
646 &dev_attr_mapping5.attr,
647 &dev_attr_mapping6.attr,
648 &dev_attr_mapping7.attr,
649 &dev_attr_mapping8.attr,
650 &dev_attr_mapping9.attr,
651 &dev_attr_mapping10.attr,
652 &dev_attr_mapping11.attr,
653 &dev_attr_mapping12.attr,
654 &dev_attr_mapping13.attr,
655 &dev_attr_mapping14.attr,
656 &dev_attr_mapping15.attr,
657 &dev_attr_mapping16.attr,
658 &dev_attr_mapping17.attr,
659 &dev_attr_mapping18.attr,
660 &dev_attr_mapping19.attr,
661 &dev_attr_mapping20.attr,
662 &dev_attr_mapping21.attr,
663 &dev_attr_mapping22.attr,
664 &dev_attr_mapping23.attr,
665 &dev_attr_mapping24.attr,
666 &dev_attr_mapping25.attr,
667 &dev_attr_mapping26.attr,
668 &dev_attr_mapping27.attr,
669 &dev_attr_mapping28.attr,
670 &dev_attr_mapping29.attr,
671 &dev_attr_mapping30.attr,
672 &dev_attr_mapping31.attr,
676 struct attribute_group nd_mapping_attribute_group = {
677 .is_visible = mapping_visible,
678 .attrs = mapping_attributes,
680 EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);
682 int nd_blk_region_init(struct nd_region *nd_region)
684 struct device *dev = &nd_region->dev;
685 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
690 if (nd_region->ndr_mappings < 1) {
691 dev_err(dev, "invalid BLK region\n");
695 return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
699 * nd_region_acquire_lane - allocate and lock a lane
700 * @nd_region: region id and number of lanes possible
702 * A lane correlates to a BLK-data-window and/or a log slot in the BTT.
703 * We optimize for the common case where there are 256 lanes, one
704 * per-cpu. For larger systems we need to lock to share lanes. For now
705 * this implementation assumes the cost of maintaining an allocator for
706 * free lanes is on the order of the lock hold time, so it implements a
707 * static lane = cpu % num_lanes mapping.
709 * In the case of a BTT instance on top of a BLK namespace a lane may be
710 * acquired recursively. We lock on the first instance.
712 * In the case of a BTT instance on top of PMEM, we only acquire a lane
713 * for the BTT metadata updates.
715 unsigned int nd_region_acquire_lane(struct nd_region *nd_region)
717 unsigned int cpu, lane;
720 if (nd_region->num_lanes < nr_cpu_ids) {
721 struct nd_percpu_lane *ndl_lock, *ndl_count;
723 lane = cpu % nd_region->num_lanes;
724 ndl_count = per_cpu_ptr(nd_region->lane, cpu);
725 ndl_lock = per_cpu_ptr(nd_region->lane, lane);
726 if (ndl_count->count++ == 0)
727 spin_lock(&ndl_lock->lock);
733 EXPORT_SYMBOL(nd_region_acquire_lane);
735 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane)
737 if (nd_region->num_lanes < nr_cpu_ids) {
738 unsigned int cpu = get_cpu();
739 struct nd_percpu_lane *ndl_lock, *ndl_count;
741 ndl_count = per_cpu_ptr(nd_region->lane, cpu);
742 ndl_lock = per_cpu_ptr(nd_region->lane, lane);
743 if (--ndl_count->count == 0)
744 spin_unlock(&ndl_lock->lock);
749 EXPORT_SYMBOL(nd_region_release_lane);
751 static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
752 struct nd_region_desc *ndr_desc, struct device_type *dev_type,
755 struct nd_region *nd_region;
761 for (i = 0; i < ndr_desc->num_mappings; i++) {
762 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
763 struct nvdimm *nvdimm = nd_mapping->nvdimm;
765 if ((nd_mapping->start | nd_mapping->size) % SZ_4K) {
766 dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n",
767 caller, dev_name(&nvdimm->dev), i);
772 if (nvdimm->flags & NDD_UNARMED)
776 if (dev_type == &nd_blk_device_type) {
777 struct nd_blk_region_desc *ndbr_desc;
778 struct nd_blk_region *ndbr;
780 ndbr_desc = to_blk_region_desc(ndr_desc);
781 ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping)
782 * ndr_desc->num_mappings,
785 nd_region = &ndbr->nd_region;
786 ndbr->enable = ndbr_desc->enable;
787 ndbr->do_io = ndbr_desc->do_io;
791 nd_region = kzalloc(sizeof(struct nd_region)
792 + sizeof(struct nd_mapping)
793 * ndr_desc->num_mappings,
795 region_buf = nd_region;
800 nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL);
801 if (nd_region->id < 0)
804 nd_region->lane = alloc_percpu(struct nd_percpu_lane);
805 if (!nd_region->lane)
808 for (i = 0; i < nr_cpu_ids; i++) {
809 struct nd_percpu_lane *ndl;
811 ndl = per_cpu_ptr(nd_region->lane, i);
812 spin_lock_init(&ndl->lock);
816 memcpy(nd_region->mapping, ndr_desc->nd_mapping,
817 sizeof(struct nd_mapping) * ndr_desc->num_mappings);
818 for (i = 0; i < ndr_desc->num_mappings; i++) {
819 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
820 struct nvdimm *nvdimm = nd_mapping->nvdimm;
822 get_device(&nvdimm->dev);
824 nd_region->ndr_mappings = ndr_desc->num_mappings;
825 nd_region->provider_data = ndr_desc->provider_data;
826 nd_region->nd_set = ndr_desc->nd_set;
827 nd_region->num_lanes = ndr_desc->num_lanes;
828 nd_region->flags = ndr_desc->flags;
830 nd_region->numa_node = ndr_desc->numa_node;
831 ida_init(&nd_region->ns_ida);
832 ida_init(&nd_region->btt_ida);
833 ida_init(&nd_region->pfn_ida);
834 ida_init(&nd_region->dax_ida);
835 dev = &nd_region->dev;
836 dev_set_name(dev, "region%d", nd_region->id);
837 dev->parent = &nvdimm_bus->dev;
838 dev->type = dev_type;
839 dev->groups = ndr_desc->attr_groups;
840 nd_region->ndr_size = resource_size(ndr_desc->res);
841 nd_region->ndr_start = ndr_desc->res->start;
842 nd_device_register(dev);
847 ida_simple_remove(®ion_ida, nd_region->id);
853 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
854 struct nd_region_desc *ndr_desc)
856 ndr_desc->num_lanes = ND_MAX_LANES;
857 return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type,
860 EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create);
862 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
863 struct nd_region_desc *ndr_desc)
865 if (ndr_desc->num_mappings > 1)
867 ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES);
868 return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type,
871 EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);
873 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
874 struct nd_region_desc *ndr_desc)
876 ndr_desc->num_lanes = ND_MAX_LANES;
877 return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type,
880 EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);
883 * nvdimm_flush - flush any posted write queues between the cpu and pmem media
884 * @nd_region: blk or interleaved pmem region
886 void nvdimm_flush(struct nd_region *nd_region)
888 struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev);
892 * Try to encourage some diversity in flush hint addresses
893 * across cpus assuming a limited number of flush hints.
895 idx = this_cpu_read(flush_idx);
896 idx = this_cpu_add_return(flush_idx, hash_32(current->pid + idx, 8));
899 * The first wmb() is needed to 'sfence' all previous writes
900 * such that they are architecturally visible for the platform
901 * buffer flush. Note that we've already arranged for pmem
902 * writes to avoid the cache via arch_memcpy_to_pmem(). The
903 * final wmb() ensures ordering for the NVDIMM flush write.
906 for (i = 0; i < nd_region->ndr_mappings; i++)
907 if (ndrd_get_flush_wpq(ndrd, i, 0))
908 writeq(1, ndrd_get_flush_wpq(ndrd, i, idx));
911 EXPORT_SYMBOL_GPL(nvdimm_flush);
914 * nvdimm_has_flush - determine write flushing requirements
915 * @nd_region: blk or interleaved pmem region
917 * Returns 1 if writes require flushing
918 * Returns 0 if writes do not require flushing
919 * Returns -ENXIO if flushing capability can not be determined
921 int nvdimm_has_flush(struct nd_region *nd_region)
923 struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev);
926 /* no nvdimm == flushing capability unknown */
927 if (nd_region->ndr_mappings == 0)
930 for (i = 0; i < nd_region->ndr_mappings; i++)
931 /* flush hints present, flushing required */
932 if (ndrd_get_flush_wpq(ndrd, i, 0))
936 * The platform defines dimm devices without hints, assume
937 * platform persistence mechanism like ADR
941 EXPORT_SYMBOL_GPL(nvdimm_has_flush);
943 void __exit nd_region_devs_exit(void)
945 ida_destroy(®ion_ida);