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 < nvdimm->num_flush; 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->flush_wpq[dimm][j] & PAGE_MASK);
59 flush_page = devm_nvdimm_ioremap(dev,
60 PHYS_PFN(pfn), PAGE_SIZE);
63 ndrd->flush_wpq[dimm][i] = flush_page
64 + (res->start & ~PAGE_MASK);
70 int nd_region_activate(struct nd_region *nd_region)
73 struct nd_region_data *ndrd;
74 struct device *dev = &nd_region->dev;
75 size_t flush_data_size = sizeof(void *);
77 nvdimm_bus_lock(&nd_region->dev);
78 for (i = 0; i < nd_region->ndr_mappings; i++) {
79 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
80 struct nvdimm *nvdimm = nd_mapping->nvdimm;
82 /* at least one null hint slot per-dimm for the "no-hint" case */
83 flush_data_size += sizeof(void *);
84 num_flush = min_not_zero(num_flush, nvdimm->num_flush);
85 if (!nvdimm->num_flush)
87 flush_data_size += nvdimm->num_flush * sizeof(void *);
89 nvdimm_bus_unlock(&nd_region->dev);
91 ndrd = devm_kzalloc(dev, sizeof(*ndrd) + flush_data_size, GFP_KERNEL);
94 dev_set_drvdata(dev, ndrd);
96 ndrd->flush_mask = (1 << ilog2(num_flush)) - 1;
97 for (i = 0; i < nd_region->ndr_mappings; i++) {
98 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
99 struct nvdimm *nvdimm = nd_mapping->nvdimm;
100 int rc = nvdimm_map_flush(&nd_region->dev, nvdimm, i, ndrd);
109 static void nd_region_release(struct device *dev)
111 struct nd_region *nd_region = to_nd_region(dev);
114 for (i = 0; i < nd_region->ndr_mappings; i++) {
115 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
116 struct nvdimm *nvdimm = nd_mapping->nvdimm;
118 put_device(&nvdimm->dev);
120 free_percpu(nd_region->lane);
121 ida_simple_remove(®ion_ida, nd_region->id);
123 kfree(to_nd_blk_region(dev));
128 static struct device_type nd_blk_device_type = {
130 .release = nd_region_release,
133 static struct device_type nd_pmem_device_type = {
135 .release = nd_region_release,
138 static struct device_type nd_volatile_device_type = {
139 .name = "nd_volatile",
140 .release = nd_region_release,
143 bool is_nd_pmem(struct device *dev)
145 return dev ? dev->type == &nd_pmem_device_type : false;
148 bool is_nd_blk(struct device *dev)
150 return dev ? dev->type == &nd_blk_device_type : false;
153 struct nd_region *to_nd_region(struct device *dev)
155 struct nd_region *nd_region = container_of(dev, struct nd_region, dev);
157 WARN_ON(dev->type->release != nd_region_release);
160 EXPORT_SYMBOL_GPL(to_nd_region);
162 struct nd_blk_region *to_nd_blk_region(struct device *dev)
164 struct nd_region *nd_region = to_nd_region(dev);
166 WARN_ON(!is_nd_blk(dev));
167 return container_of(nd_region, struct nd_blk_region, nd_region);
169 EXPORT_SYMBOL_GPL(to_nd_blk_region);
171 void *nd_region_provider_data(struct nd_region *nd_region)
173 return nd_region->provider_data;
175 EXPORT_SYMBOL_GPL(nd_region_provider_data);
177 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr)
179 return ndbr->blk_provider_data;
181 EXPORT_SYMBOL_GPL(nd_blk_region_provider_data);
183 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data)
185 ndbr->blk_provider_data = data;
187 EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data);
190 * nd_region_to_nstype() - region to an integer namespace type
191 * @nd_region: region-device to interrogate
193 * This is the 'nstype' attribute of a region as well, an input to the
194 * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match
195 * namespace devices with namespace drivers.
197 int nd_region_to_nstype(struct nd_region *nd_region)
199 if (is_nd_pmem(&nd_region->dev)) {
202 for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) {
203 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
204 struct nvdimm *nvdimm = nd_mapping->nvdimm;
206 if (nvdimm->flags & NDD_ALIASING)
210 return ND_DEVICE_NAMESPACE_PMEM;
212 return ND_DEVICE_NAMESPACE_IO;
213 } else if (is_nd_blk(&nd_region->dev)) {
214 return ND_DEVICE_NAMESPACE_BLK;
219 EXPORT_SYMBOL(nd_region_to_nstype);
221 static ssize_t size_show(struct device *dev,
222 struct device_attribute *attr, char *buf)
224 struct nd_region *nd_region = to_nd_region(dev);
225 unsigned long long size = 0;
227 if (is_nd_pmem(dev)) {
228 size = nd_region->ndr_size;
229 } else if (nd_region->ndr_mappings == 1) {
230 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
232 size = nd_mapping->size;
235 return sprintf(buf, "%llu\n", size);
237 static DEVICE_ATTR_RO(size);
239 static ssize_t mappings_show(struct device *dev,
240 struct device_attribute *attr, char *buf)
242 struct nd_region *nd_region = to_nd_region(dev);
244 return sprintf(buf, "%d\n", nd_region->ndr_mappings);
246 static DEVICE_ATTR_RO(mappings);
248 static ssize_t nstype_show(struct device *dev,
249 struct device_attribute *attr, char *buf)
251 struct nd_region *nd_region = to_nd_region(dev);
253 return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
255 static DEVICE_ATTR_RO(nstype);
257 static ssize_t set_cookie_show(struct device *dev,
258 struct device_attribute *attr, char *buf)
260 struct nd_region *nd_region = to_nd_region(dev);
261 struct nd_interleave_set *nd_set = nd_region->nd_set;
263 if (is_nd_pmem(dev) && nd_set)
264 /* pass, should be precluded by region_visible */;
268 return sprintf(buf, "%#llx\n", nd_set->cookie);
270 static DEVICE_ATTR_RO(set_cookie);
272 resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
274 resource_size_t blk_max_overlap = 0, available, overlap;
277 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
281 overlap = blk_max_overlap;
282 for (i = 0; i < nd_region->ndr_mappings; i++) {
283 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
284 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
286 /* if a dimm is disabled the available capacity is zero */
290 if (is_nd_pmem(&nd_region->dev)) {
291 available += nd_pmem_available_dpa(nd_region,
292 nd_mapping, &overlap);
293 if (overlap > blk_max_overlap) {
294 blk_max_overlap = overlap;
297 } else if (is_nd_blk(&nd_region->dev)) {
298 available += nd_blk_available_dpa(nd_mapping);
305 static ssize_t available_size_show(struct device *dev,
306 struct device_attribute *attr, char *buf)
308 struct nd_region *nd_region = to_nd_region(dev);
309 unsigned long long available = 0;
312 * Flush in-flight updates and grab a snapshot of the available
313 * size. Of course, this value is potentially invalidated the
314 * memory nvdimm_bus_lock() is dropped, but that's userspace's
315 * problem to not race itself.
317 nvdimm_bus_lock(dev);
318 wait_nvdimm_bus_probe_idle(dev);
319 available = nd_region_available_dpa(nd_region);
320 nvdimm_bus_unlock(dev);
322 return sprintf(buf, "%llu\n", available);
324 static DEVICE_ATTR_RO(available_size);
326 static ssize_t init_namespaces_show(struct device *dev,
327 struct device_attribute *attr, char *buf)
329 struct nd_region_data *ndrd = dev_get_drvdata(dev);
332 nvdimm_bus_lock(dev);
334 rc = sprintf(buf, "%d/%d\n", ndrd->ns_active, ndrd->ns_count);
337 nvdimm_bus_unlock(dev);
341 static DEVICE_ATTR_RO(init_namespaces);
343 static ssize_t namespace_seed_show(struct device *dev,
344 struct device_attribute *attr, char *buf)
346 struct nd_region *nd_region = to_nd_region(dev);
349 nvdimm_bus_lock(dev);
350 if (nd_region->ns_seed)
351 rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed));
353 rc = sprintf(buf, "\n");
354 nvdimm_bus_unlock(dev);
357 static DEVICE_ATTR_RO(namespace_seed);
359 static ssize_t btt_seed_show(struct device *dev,
360 struct device_attribute *attr, char *buf)
362 struct nd_region *nd_region = to_nd_region(dev);
365 nvdimm_bus_lock(dev);
366 if (nd_region->btt_seed)
367 rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed));
369 rc = sprintf(buf, "\n");
370 nvdimm_bus_unlock(dev);
374 static DEVICE_ATTR_RO(btt_seed);
376 static ssize_t pfn_seed_show(struct device *dev,
377 struct device_attribute *attr, char *buf)
379 struct nd_region *nd_region = to_nd_region(dev);
382 nvdimm_bus_lock(dev);
383 if (nd_region->pfn_seed)
384 rc = sprintf(buf, "%s\n", dev_name(nd_region->pfn_seed));
386 rc = sprintf(buf, "\n");
387 nvdimm_bus_unlock(dev);
391 static DEVICE_ATTR_RO(pfn_seed);
393 static ssize_t dax_seed_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
396 struct nd_region *nd_region = to_nd_region(dev);
399 nvdimm_bus_lock(dev);
400 if (nd_region->dax_seed)
401 rc = sprintf(buf, "%s\n", dev_name(nd_region->dax_seed));
403 rc = sprintf(buf, "\n");
404 nvdimm_bus_unlock(dev);
408 static DEVICE_ATTR_RO(dax_seed);
410 static ssize_t read_only_show(struct device *dev,
411 struct device_attribute *attr, char *buf)
413 struct nd_region *nd_region = to_nd_region(dev);
415 return sprintf(buf, "%d\n", nd_region->ro);
418 static ssize_t read_only_store(struct device *dev,
419 struct device_attribute *attr, const char *buf, size_t len)
422 int rc = strtobool(buf, &ro);
423 struct nd_region *nd_region = to_nd_region(dev);
431 static DEVICE_ATTR_RW(read_only);
433 static struct attribute *nd_region_attributes[] = {
435 &dev_attr_nstype.attr,
436 &dev_attr_mappings.attr,
437 &dev_attr_btt_seed.attr,
438 &dev_attr_pfn_seed.attr,
439 &dev_attr_dax_seed.attr,
440 &dev_attr_read_only.attr,
441 &dev_attr_set_cookie.attr,
442 &dev_attr_available_size.attr,
443 &dev_attr_namespace_seed.attr,
444 &dev_attr_init_namespaces.attr,
448 static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
450 struct device *dev = container_of(kobj, typeof(*dev), kobj);
451 struct nd_region *nd_region = to_nd_region(dev);
452 struct nd_interleave_set *nd_set = nd_region->nd_set;
453 int type = nd_region_to_nstype(nd_region);
455 if (!is_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr)
458 if (!is_nd_pmem(dev) && a == &dev_attr_dax_seed.attr)
461 if (a != &dev_attr_set_cookie.attr
462 && a != &dev_attr_available_size.attr)
465 if ((type == ND_DEVICE_NAMESPACE_PMEM
466 || type == ND_DEVICE_NAMESPACE_BLK)
467 && a == &dev_attr_available_size.attr)
469 else if (is_nd_pmem(dev) && nd_set)
475 struct attribute_group nd_region_attribute_group = {
476 .attrs = nd_region_attributes,
477 .is_visible = region_visible,
479 EXPORT_SYMBOL_GPL(nd_region_attribute_group);
481 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
483 struct nd_interleave_set *nd_set = nd_region->nd_set;
486 return nd_set->cookie;
491 * Upon successful probe/remove, take/release a reference on the
492 * associated interleave set (if present), and plant new btt + namespace
493 * seeds. Also, on the removal of a BLK region, notify the provider to
494 * disable the region.
496 static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
497 struct device *dev, bool probe)
499 struct nd_region *nd_region;
501 if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) {
504 nd_region = to_nd_region(dev);
505 for (i = 0; i < nd_region->ndr_mappings; i++) {
506 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
507 struct nvdimm_drvdata *ndd = nd_mapping->ndd;
508 struct nvdimm *nvdimm = nd_mapping->nvdimm;
510 kfree(nd_mapping->labels);
511 nd_mapping->labels = NULL;
513 nd_mapping->ndd = NULL;
515 atomic_dec(&nvdimm->busy);
521 if (dev->parent && is_nd_blk(dev->parent) && probe) {
522 nd_region = to_nd_region(dev->parent);
523 nvdimm_bus_lock(dev);
524 if (nd_region->ns_seed == dev)
525 nd_region_create_blk_seed(nd_region);
526 nvdimm_bus_unlock(dev);
528 if (is_nd_btt(dev) && probe) {
529 struct nd_btt *nd_btt = to_nd_btt(dev);
531 nd_region = to_nd_region(dev->parent);
532 nvdimm_bus_lock(dev);
533 if (nd_region->btt_seed == dev)
534 nd_region_create_btt_seed(nd_region);
535 if (nd_region->ns_seed == &nd_btt->ndns->dev &&
536 is_nd_blk(dev->parent))
537 nd_region_create_blk_seed(nd_region);
538 nvdimm_bus_unlock(dev);
540 if (is_nd_pfn(dev) && probe) {
541 nd_region = to_nd_region(dev->parent);
542 nvdimm_bus_lock(dev);
543 if (nd_region->pfn_seed == dev)
544 nd_region_create_pfn_seed(nd_region);
545 nvdimm_bus_unlock(dev);
547 if (is_nd_dax(dev) && probe) {
548 nd_region = to_nd_region(dev->parent);
549 nvdimm_bus_lock(dev);
550 if (nd_region->dax_seed == dev)
551 nd_region_create_dax_seed(nd_region);
552 nvdimm_bus_unlock(dev);
556 void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
558 nd_region_notify_driver_action(nvdimm_bus, dev, true);
561 void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
563 nd_region_notify_driver_action(nvdimm_bus, dev, false);
566 static ssize_t mappingN(struct device *dev, char *buf, int n)
568 struct nd_region *nd_region = to_nd_region(dev);
569 struct nd_mapping *nd_mapping;
570 struct nvdimm *nvdimm;
572 if (n >= nd_region->ndr_mappings)
574 nd_mapping = &nd_region->mapping[n];
575 nvdimm = nd_mapping->nvdimm;
577 return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev),
578 nd_mapping->start, nd_mapping->size);
581 #define REGION_MAPPING(idx) \
582 static ssize_t mapping##idx##_show(struct device *dev, \
583 struct device_attribute *attr, char *buf) \
585 return mappingN(dev, buf, idx); \
587 static DEVICE_ATTR_RO(mapping##idx)
590 * 32 should be enough for a while, even in the presence of socket
591 * interleave a 32-way interleave set is a degenerate case.
626 static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n)
628 struct device *dev = container_of(kobj, struct device, kobj);
629 struct nd_region *nd_region = to_nd_region(dev);
631 if (n < nd_region->ndr_mappings)
636 static struct attribute *mapping_attributes[] = {
637 &dev_attr_mapping0.attr,
638 &dev_attr_mapping1.attr,
639 &dev_attr_mapping2.attr,
640 &dev_attr_mapping3.attr,
641 &dev_attr_mapping4.attr,
642 &dev_attr_mapping5.attr,
643 &dev_attr_mapping6.attr,
644 &dev_attr_mapping7.attr,
645 &dev_attr_mapping8.attr,
646 &dev_attr_mapping9.attr,
647 &dev_attr_mapping10.attr,
648 &dev_attr_mapping11.attr,
649 &dev_attr_mapping12.attr,
650 &dev_attr_mapping13.attr,
651 &dev_attr_mapping14.attr,
652 &dev_attr_mapping15.attr,
653 &dev_attr_mapping16.attr,
654 &dev_attr_mapping17.attr,
655 &dev_attr_mapping18.attr,
656 &dev_attr_mapping19.attr,
657 &dev_attr_mapping20.attr,
658 &dev_attr_mapping21.attr,
659 &dev_attr_mapping22.attr,
660 &dev_attr_mapping23.attr,
661 &dev_attr_mapping24.attr,
662 &dev_attr_mapping25.attr,
663 &dev_attr_mapping26.attr,
664 &dev_attr_mapping27.attr,
665 &dev_attr_mapping28.attr,
666 &dev_attr_mapping29.attr,
667 &dev_attr_mapping30.attr,
668 &dev_attr_mapping31.attr,
672 struct attribute_group nd_mapping_attribute_group = {
673 .is_visible = mapping_visible,
674 .attrs = mapping_attributes,
676 EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);
678 int nd_blk_region_init(struct nd_region *nd_region)
680 struct device *dev = &nd_region->dev;
681 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
686 if (nd_region->ndr_mappings < 1) {
687 dev_err(dev, "invalid BLK region\n");
691 return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
695 * nd_region_acquire_lane - allocate and lock a lane
696 * @nd_region: region id and number of lanes possible
698 * A lane correlates to a BLK-data-window and/or a log slot in the BTT.
699 * We optimize for the common case where there are 256 lanes, one
700 * per-cpu. For larger systems we need to lock to share lanes. For now
701 * this implementation assumes the cost of maintaining an allocator for
702 * free lanes is on the order of the lock hold time, so it implements a
703 * static lane = cpu % num_lanes mapping.
705 * In the case of a BTT instance on top of a BLK namespace a lane may be
706 * acquired recursively. We lock on the first instance.
708 * In the case of a BTT instance on top of PMEM, we only acquire a lane
709 * for the BTT metadata updates.
711 unsigned int nd_region_acquire_lane(struct nd_region *nd_region)
713 unsigned int cpu, lane;
716 if (nd_region->num_lanes < nr_cpu_ids) {
717 struct nd_percpu_lane *ndl_lock, *ndl_count;
719 lane = cpu % nd_region->num_lanes;
720 ndl_count = per_cpu_ptr(nd_region->lane, cpu);
721 ndl_lock = per_cpu_ptr(nd_region->lane, lane);
722 if (ndl_count->count++ == 0)
723 spin_lock(&ndl_lock->lock);
729 EXPORT_SYMBOL(nd_region_acquire_lane);
731 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane)
733 if (nd_region->num_lanes < nr_cpu_ids) {
734 unsigned int cpu = get_cpu();
735 struct nd_percpu_lane *ndl_lock, *ndl_count;
737 ndl_count = per_cpu_ptr(nd_region->lane, cpu);
738 ndl_lock = per_cpu_ptr(nd_region->lane, lane);
739 if (--ndl_count->count == 0)
740 spin_unlock(&ndl_lock->lock);
745 EXPORT_SYMBOL(nd_region_release_lane);
747 static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
748 struct nd_region_desc *ndr_desc, struct device_type *dev_type,
751 struct nd_region *nd_region;
757 for (i = 0; i < ndr_desc->num_mappings; i++) {
758 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
759 struct nvdimm *nvdimm = nd_mapping->nvdimm;
761 if ((nd_mapping->start | nd_mapping->size) % SZ_4K) {
762 dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n",
763 caller, dev_name(&nvdimm->dev), i);
768 if (nvdimm->flags & NDD_UNARMED)
772 if (dev_type == &nd_blk_device_type) {
773 struct nd_blk_region_desc *ndbr_desc;
774 struct nd_blk_region *ndbr;
776 ndbr_desc = to_blk_region_desc(ndr_desc);
777 ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping)
778 * ndr_desc->num_mappings,
781 nd_region = &ndbr->nd_region;
782 ndbr->enable = ndbr_desc->enable;
783 ndbr->do_io = ndbr_desc->do_io;
787 nd_region = kzalloc(sizeof(struct nd_region)
788 + sizeof(struct nd_mapping)
789 * ndr_desc->num_mappings,
791 region_buf = nd_region;
796 nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL);
797 if (nd_region->id < 0)
800 nd_region->lane = alloc_percpu(struct nd_percpu_lane);
801 if (!nd_region->lane)
804 for (i = 0; i < nr_cpu_ids; i++) {
805 struct nd_percpu_lane *ndl;
807 ndl = per_cpu_ptr(nd_region->lane, i);
808 spin_lock_init(&ndl->lock);
812 memcpy(nd_region->mapping, ndr_desc->nd_mapping,
813 sizeof(struct nd_mapping) * ndr_desc->num_mappings);
814 for (i = 0; i < ndr_desc->num_mappings; i++) {
815 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
816 struct nvdimm *nvdimm = nd_mapping->nvdimm;
818 get_device(&nvdimm->dev);
820 nd_region->ndr_mappings = ndr_desc->num_mappings;
821 nd_region->provider_data = ndr_desc->provider_data;
822 nd_region->nd_set = ndr_desc->nd_set;
823 nd_region->num_lanes = ndr_desc->num_lanes;
824 nd_region->flags = ndr_desc->flags;
826 nd_region->numa_node = ndr_desc->numa_node;
827 ida_init(&nd_region->ns_ida);
828 ida_init(&nd_region->btt_ida);
829 ida_init(&nd_region->pfn_ida);
830 ida_init(&nd_region->dax_ida);
831 dev = &nd_region->dev;
832 dev_set_name(dev, "region%d", nd_region->id);
833 dev->parent = &nvdimm_bus->dev;
834 dev->type = dev_type;
835 dev->groups = ndr_desc->attr_groups;
836 nd_region->ndr_size = resource_size(ndr_desc->res);
837 nd_region->ndr_start = ndr_desc->res->start;
838 nd_device_register(dev);
843 ida_simple_remove(®ion_ida, nd_region->id);
849 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
850 struct nd_region_desc *ndr_desc)
852 ndr_desc->num_lanes = ND_MAX_LANES;
853 return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type,
856 EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create);
858 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
859 struct nd_region_desc *ndr_desc)
861 if (ndr_desc->num_mappings > 1)
863 ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES);
864 return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type,
867 EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);
869 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
870 struct nd_region_desc *ndr_desc)
872 ndr_desc->num_lanes = ND_MAX_LANES;
873 return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type,
876 EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);
879 * nvdimm_flush - flush any posted write queues between the cpu and pmem media
880 * @nd_region: blk or interleaved pmem region
882 void nvdimm_flush(struct nd_region *nd_region)
884 struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev);
888 * Try to encourage some diversity in flush hint addresses
889 * across cpus assuming a limited number of flush hints.
891 idx = this_cpu_read(flush_idx);
892 idx = this_cpu_add_return(flush_idx, hash_32(current->pid + idx, 8));
895 * The first wmb() is needed to 'sfence' all previous writes
896 * such that they are architecturally visible for the platform
897 * buffer flush. Note that we've already arranged for pmem
898 * writes to avoid the cache via arch_memcpy_to_pmem(). The
899 * final wmb() ensures ordering for the NVDIMM flush write.
902 for (i = 0; i < nd_region->ndr_mappings; i++)
903 if (ndrd->flush_wpq[i][0])
904 writeq(1, ndrd->flush_wpq[i][idx & ndrd->flush_mask]);
907 EXPORT_SYMBOL_GPL(nvdimm_flush);
910 * nvdimm_has_flush - determine write flushing requirements
911 * @nd_region: blk or interleaved pmem region
913 * Returns 1 if writes require flushing
914 * Returns 0 if writes do not require flushing
915 * Returns -ENXIO if flushing capability can not be determined
917 int nvdimm_has_flush(struct nd_region *nd_region)
919 struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev);
922 /* no nvdimm == flushing capability unknown */
923 if (nd_region->ndr_mappings == 0)
926 for (i = 0; i < nd_region->ndr_mappings; i++)
927 /* flush hints present, flushing required */
928 if (ndrd->flush_wpq[i][0])
932 * The platform defines dimm devices without hints, assume
933 * platform persistence mechanism like ADR
937 EXPORT_SYMBOL_GPL(nvdimm_has_flush);
939 void __exit nd_region_devs_exit(void)
941 ida_destroy(®ion_ida);