| /* |
| * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of version 2 of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| */ |
| #include <linux/scatterlist.h> |
| #include <linux/highmem.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/sort.h> |
| #include <linux/io.h> |
| #include <linux/nd.h> |
| #include "nd-core.h" |
| #include "nd.h" |
| |
| static DEFINE_IDA(region_ida); |
| |
| static void nd_region_release(struct device *dev) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| u16 i; |
| |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| |
| put_device(&nvdimm->dev); |
| } |
| free_percpu(nd_region->lane); |
| ida_simple_remove(®ion_ida, nd_region->id); |
| if (is_nd_blk(dev)) |
| kfree(to_nd_blk_region(dev)); |
| else |
| kfree(nd_region); |
| } |
| |
| static struct device_type nd_blk_device_type = { |
| .name = "nd_blk", |
| .release = nd_region_release, |
| }; |
| |
| static struct device_type nd_pmem_device_type = { |
| .name = "nd_pmem", |
| .release = nd_region_release, |
| }; |
| |
| static struct device_type nd_volatile_device_type = { |
| .name = "nd_volatile", |
| .release = nd_region_release, |
| }; |
| |
| bool is_nd_pmem(struct device *dev) |
| { |
| return dev ? dev->type == &nd_pmem_device_type : false; |
| } |
| |
| bool is_nd_blk(struct device *dev) |
| { |
| return dev ? dev->type == &nd_blk_device_type : false; |
| } |
| |
| struct nd_region *to_nd_region(struct device *dev) |
| { |
| struct nd_region *nd_region = container_of(dev, struct nd_region, dev); |
| |
| WARN_ON(dev->type->release != nd_region_release); |
| return nd_region; |
| } |
| EXPORT_SYMBOL_GPL(to_nd_region); |
| |
| struct nd_blk_region *to_nd_blk_region(struct device *dev) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| |
| WARN_ON(!is_nd_blk(dev)); |
| return container_of(nd_region, struct nd_blk_region, nd_region); |
| } |
| EXPORT_SYMBOL_GPL(to_nd_blk_region); |
| |
| void *nd_region_provider_data(struct nd_region *nd_region) |
| { |
| return nd_region->provider_data; |
| } |
| EXPORT_SYMBOL_GPL(nd_region_provider_data); |
| |
| void *nd_blk_region_provider_data(struct nd_blk_region *ndbr) |
| { |
| return ndbr->blk_provider_data; |
| } |
| EXPORT_SYMBOL_GPL(nd_blk_region_provider_data); |
| |
| void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data) |
| { |
| ndbr->blk_provider_data = data; |
| } |
| EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data); |
| |
| /** |
| * nd_region_to_nstype() - region to an integer namespace type |
| * @nd_region: region-device to interrogate |
| * |
| * This is the 'nstype' attribute of a region as well, an input to the |
| * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match |
| * namespace devices with namespace drivers. |
| */ |
| int nd_region_to_nstype(struct nd_region *nd_region) |
| { |
| if (is_nd_pmem(&nd_region->dev)) { |
| u16 i, alias; |
| |
| for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| |
| if (nvdimm->flags & NDD_ALIASING) |
| alias++; |
| } |
| if (alias) |
| return ND_DEVICE_NAMESPACE_PMEM; |
| else |
| return ND_DEVICE_NAMESPACE_IO; |
| } else if (is_nd_blk(&nd_region->dev)) { |
| return ND_DEVICE_NAMESPACE_BLK; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(nd_region_to_nstype); |
| |
| static ssize_t size_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| unsigned long long size = 0; |
| |
| if (is_nd_pmem(dev)) { |
| size = nd_region->ndr_size; |
| } else if (nd_region->ndr_mappings == 1) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[0]; |
| |
| size = nd_mapping->size; |
| } |
| |
| return sprintf(buf, "%llu\n", size); |
| } |
| static DEVICE_ATTR_RO(size); |
| |
| static ssize_t mappings_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| |
| return sprintf(buf, "%d\n", nd_region->ndr_mappings); |
| } |
| static DEVICE_ATTR_RO(mappings); |
| |
| static ssize_t nstype_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| |
| return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region)); |
| } |
| static DEVICE_ATTR_RO(nstype); |
| |
| static ssize_t set_cookie_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| struct nd_interleave_set *nd_set = nd_region->nd_set; |
| |
| if (is_nd_pmem(dev) && nd_set) |
| /* pass, should be precluded by region_visible */; |
| else |
| return -ENXIO; |
| |
| return sprintf(buf, "%#llx\n", nd_set->cookie); |
| } |
| static DEVICE_ATTR_RO(set_cookie); |
| |
| resource_size_t nd_region_available_dpa(struct nd_region *nd_region) |
| { |
| resource_size_t blk_max_overlap = 0, available, overlap; |
| int i; |
| |
| WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); |
| |
| retry: |
| available = 0; |
| overlap = blk_max_overlap; |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| |
| /* if a dimm is disabled the available capacity is zero */ |
| if (!ndd) |
| return 0; |
| |
| if (is_nd_pmem(&nd_region->dev)) { |
| available += nd_pmem_available_dpa(nd_region, |
| nd_mapping, &overlap); |
| if (overlap > blk_max_overlap) { |
| blk_max_overlap = overlap; |
| goto retry; |
| } |
| } else if (is_nd_blk(&nd_region->dev)) { |
| available += nd_blk_available_dpa(nd_mapping); |
| } |
| } |
| |
| return available; |
| } |
| |
| static ssize_t available_size_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| unsigned long long available = 0; |
| |
| /* |
| * Flush in-flight updates and grab a snapshot of the available |
| * size. Of course, this value is potentially invalidated the |
| * memory nvdimm_bus_lock() is dropped, but that's userspace's |
| * problem to not race itself. |
| */ |
| nvdimm_bus_lock(dev); |
| wait_nvdimm_bus_probe_idle(dev); |
| available = nd_region_available_dpa(nd_region); |
| nvdimm_bus_unlock(dev); |
| |
| return sprintf(buf, "%llu\n", available); |
| } |
| static DEVICE_ATTR_RO(available_size); |
| |
| static ssize_t init_namespaces_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region_namespaces *num_ns = dev_get_drvdata(dev); |
| ssize_t rc; |
| |
| nvdimm_bus_lock(dev); |
| if (num_ns) |
| rc = sprintf(buf, "%d/%d\n", num_ns->active, num_ns->count); |
| else |
| rc = -ENXIO; |
| nvdimm_bus_unlock(dev); |
| |
| return rc; |
| } |
| static DEVICE_ATTR_RO(init_namespaces); |
| |
| static ssize_t namespace_seed_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| ssize_t rc; |
| |
| nvdimm_bus_lock(dev); |
| if (nd_region->ns_seed) |
| rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed)); |
| else |
| rc = sprintf(buf, "\n"); |
| nvdimm_bus_unlock(dev); |
| return rc; |
| } |
| static DEVICE_ATTR_RO(namespace_seed); |
| |
| static ssize_t btt_seed_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| ssize_t rc; |
| |
| nvdimm_bus_lock(dev); |
| if (nd_region->btt_seed) |
| rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed)); |
| else |
| rc = sprintf(buf, "\n"); |
| nvdimm_bus_unlock(dev); |
| |
| return rc; |
| } |
| static DEVICE_ATTR_RO(btt_seed); |
| |
| static ssize_t pfn_seed_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| ssize_t rc; |
| |
| nvdimm_bus_lock(dev); |
| if (nd_region->pfn_seed) |
| rc = sprintf(buf, "%s\n", dev_name(nd_region->pfn_seed)); |
| else |
| rc = sprintf(buf, "\n"); |
| nvdimm_bus_unlock(dev); |
| |
| return rc; |
| } |
| static DEVICE_ATTR_RO(pfn_seed); |
| |
| static ssize_t dax_seed_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| ssize_t rc; |
| |
| nvdimm_bus_lock(dev); |
| if (nd_region->dax_seed) |
| rc = sprintf(buf, "%s\n", dev_name(nd_region->dax_seed)); |
| else |
| rc = sprintf(buf, "\n"); |
| nvdimm_bus_unlock(dev); |
| |
| return rc; |
| } |
| static DEVICE_ATTR_RO(dax_seed); |
| |
| static ssize_t read_only_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| |
| return sprintf(buf, "%d\n", nd_region->ro); |
| } |
| |
| static ssize_t read_only_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t len) |
| { |
| bool ro; |
| int rc = strtobool(buf, &ro); |
| struct nd_region *nd_region = to_nd_region(dev); |
| |
| if (rc) |
| return rc; |
| |
| nd_region->ro = ro; |
| return len; |
| } |
| static DEVICE_ATTR_RW(read_only); |
| |
| static struct attribute *nd_region_attributes[] = { |
| &dev_attr_size.attr, |
| &dev_attr_nstype.attr, |
| &dev_attr_mappings.attr, |
| &dev_attr_btt_seed.attr, |
| &dev_attr_pfn_seed.attr, |
| &dev_attr_dax_seed.attr, |
| &dev_attr_read_only.attr, |
| &dev_attr_set_cookie.attr, |
| &dev_attr_available_size.attr, |
| &dev_attr_namespace_seed.attr, |
| &dev_attr_init_namespaces.attr, |
| NULL, |
| }; |
| |
| static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n) |
| { |
| struct device *dev = container_of(kobj, typeof(*dev), kobj); |
| struct nd_region *nd_region = to_nd_region(dev); |
| struct nd_interleave_set *nd_set = nd_region->nd_set; |
| int type = nd_region_to_nstype(nd_region); |
| |
| if (!is_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr) |
| return 0; |
| |
| if (!is_nd_pmem(dev) && a == &dev_attr_dax_seed.attr) |
| return 0; |
| |
| if (a != &dev_attr_set_cookie.attr |
| && a != &dev_attr_available_size.attr) |
| return a->mode; |
| |
| if ((type == ND_DEVICE_NAMESPACE_PMEM |
| || type == ND_DEVICE_NAMESPACE_BLK) |
| && a == &dev_attr_available_size.attr) |
| return a->mode; |
| else if (is_nd_pmem(dev) && nd_set) |
| return a->mode; |
| |
| return 0; |
| } |
| |
| struct attribute_group nd_region_attribute_group = { |
| .attrs = nd_region_attributes, |
| .is_visible = region_visible, |
| }; |
| EXPORT_SYMBOL_GPL(nd_region_attribute_group); |
| |
| u64 nd_region_interleave_set_cookie(struct nd_region *nd_region) |
| { |
| struct nd_interleave_set *nd_set = nd_region->nd_set; |
| |
| if (nd_set) |
| return nd_set->cookie; |
| return 0; |
| } |
| |
| /* |
| * Upon successful probe/remove, take/release a reference on the |
| * associated interleave set (if present), and plant new btt + namespace |
| * seeds. Also, on the removal of a BLK region, notify the provider to |
| * disable the region. |
| */ |
| static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus, |
| struct device *dev, bool probe) |
| { |
| struct nd_region *nd_region; |
| |
| if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) { |
| int i; |
| |
| nd_region = to_nd_region(dev); |
| for (i = 0; i < nd_region->ndr_mappings; i++) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| struct nvdimm_drvdata *ndd = nd_mapping->ndd; |
| struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| |
| kfree(nd_mapping->labels); |
| nd_mapping->labels = NULL; |
| put_ndd(ndd); |
| nd_mapping->ndd = NULL; |
| if (ndd) |
| atomic_dec(&nvdimm->busy); |
| } |
| |
| if (is_nd_pmem(dev)) |
| return; |
| } |
| if (dev->parent && is_nd_blk(dev->parent) && probe) { |
| nd_region = to_nd_region(dev->parent); |
| nvdimm_bus_lock(dev); |
| if (nd_region->ns_seed == dev) |
| nd_region_create_blk_seed(nd_region); |
| nvdimm_bus_unlock(dev); |
| } |
| if (is_nd_btt(dev) && probe) { |
| struct nd_btt *nd_btt = to_nd_btt(dev); |
| |
| nd_region = to_nd_region(dev->parent); |
| nvdimm_bus_lock(dev); |
| if (nd_region->btt_seed == dev) |
| nd_region_create_btt_seed(nd_region); |
| if (nd_region->ns_seed == &nd_btt->ndns->dev && |
| is_nd_blk(dev->parent)) |
| nd_region_create_blk_seed(nd_region); |
| nvdimm_bus_unlock(dev); |
| } |
| if (is_nd_pfn(dev) && probe) { |
| nd_region = to_nd_region(dev->parent); |
| nvdimm_bus_lock(dev); |
| if (nd_region->pfn_seed == dev) |
| nd_region_create_pfn_seed(nd_region); |
| nvdimm_bus_unlock(dev); |
| } |
| if (is_nd_dax(dev) && probe) { |
| nd_region = to_nd_region(dev->parent); |
| nvdimm_bus_lock(dev); |
| if (nd_region->dax_seed == dev) |
| nd_region_create_dax_seed(nd_region); |
| nvdimm_bus_unlock(dev); |
| } |
| } |
| |
| void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev) |
| { |
| nd_region_notify_driver_action(nvdimm_bus, dev, true); |
| } |
| |
| void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev) |
| { |
| nd_region_notify_driver_action(nvdimm_bus, dev, false); |
| } |
| |
| static ssize_t mappingN(struct device *dev, char *buf, int n) |
| { |
| struct nd_region *nd_region = to_nd_region(dev); |
| struct nd_mapping *nd_mapping; |
| struct nvdimm *nvdimm; |
| |
| if (n >= nd_region->ndr_mappings) |
| return -ENXIO; |
| nd_mapping = &nd_region->mapping[n]; |
| nvdimm = nd_mapping->nvdimm; |
| |
| return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev), |
| nd_mapping->start, nd_mapping->size); |
| } |
| |
| #define REGION_MAPPING(idx) \ |
| static ssize_t mapping##idx##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| return mappingN(dev, buf, idx); \ |
| } \ |
| static DEVICE_ATTR_RO(mapping##idx) |
| |
| /* |
| * 32 should be enough for a while, even in the presence of socket |
| * interleave a 32-way interleave set is a degenerate case. |
| */ |
| REGION_MAPPING(0); |
| REGION_MAPPING(1); |
| REGION_MAPPING(2); |
| REGION_MAPPING(3); |
| REGION_MAPPING(4); |
| REGION_MAPPING(5); |
| REGION_MAPPING(6); |
| REGION_MAPPING(7); |
| REGION_MAPPING(8); |
| REGION_MAPPING(9); |
| REGION_MAPPING(10); |
| REGION_MAPPING(11); |
| REGION_MAPPING(12); |
| REGION_MAPPING(13); |
| REGION_MAPPING(14); |
| REGION_MAPPING(15); |
| REGION_MAPPING(16); |
| REGION_MAPPING(17); |
| REGION_MAPPING(18); |
| REGION_MAPPING(19); |
| REGION_MAPPING(20); |
| REGION_MAPPING(21); |
| REGION_MAPPING(22); |
| REGION_MAPPING(23); |
| REGION_MAPPING(24); |
| REGION_MAPPING(25); |
| REGION_MAPPING(26); |
| REGION_MAPPING(27); |
| REGION_MAPPING(28); |
| REGION_MAPPING(29); |
| REGION_MAPPING(30); |
| REGION_MAPPING(31); |
| |
| static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n) |
| { |
| struct device *dev = container_of(kobj, struct device, kobj); |
| struct nd_region *nd_region = to_nd_region(dev); |
| |
| if (n < nd_region->ndr_mappings) |
| return a->mode; |
| return 0; |
| } |
| |
| static struct attribute *mapping_attributes[] = { |
| &dev_attr_mapping0.attr, |
| &dev_attr_mapping1.attr, |
| &dev_attr_mapping2.attr, |
| &dev_attr_mapping3.attr, |
| &dev_attr_mapping4.attr, |
| &dev_attr_mapping5.attr, |
| &dev_attr_mapping6.attr, |
| &dev_attr_mapping7.attr, |
| &dev_attr_mapping8.attr, |
| &dev_attr_mapping9.attr, |
| &dev_attr_mapping10.attr, |
| &dev_attr_mapping11.attr, |
| &dev_attr_mapping12.attr, |
| &dev_attr_mapping13.attr, |
| &dev_attr_mapping14.attr, |
| &dev_attr_mapping15.attr, |
| &dev_attr_mapping16.attr, |
| &dev_attr_mapping17.attr, |
| &dev_attr_mapping18.attr, |
| &dev_attr_mapping19.attr, |
| &dev_attr_mapping20.attr, |
| &dev_attr_mapping21.attr, |
| &dev_attr_mapping22.attr, |
| &dev_attr_mapping23.attr, |
| &dev_attr_mapping24.attr, |
| &dev_attr_mapping25.attr, |
| &dev_attr_mapping26.attr, |
| &dev_attr_mapping27.attr, |
| &dev_attr_mapping28.attr, |
| &dev_attr_mapping29.attr, |
| &dev_attr_mapping30.attr, |
| &dev_attr_mapping31.attr, |
| NULL, |
| }; |
| |
| struct attribute_group nd_mapping_attribute_group = { |
| .is_visible = mapping_visible, |
| .attrs = mapping_attributes, |
| }; |
| EXPORT_SYMBOL_GPL(nd_mapping_attribute_group); |
| |
| int nd_blk_region_init(struct nd_region *nd_region) |
| { |
| struct device *dev = &nd_region->dev; |
| struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
| |
| if (!is_nd_blk(dev)) |
| return 0; |
| |
| if (nd_region->ndr_mappings < 1) { |
| dev_err(dev, "invalid BLK region\n"); |
| return -ENXIO; |
| } |
| |
| return to_nd_blk_region(dev)->enable(nvdimm_bus, dev); |
| } |
| |
| /** |
| * nd_region_acquire_lane - allocate and lock a lane |
| * @nd_region: region id and number of lanes possible |
| * |
| * A lane correlates to a BLK-data-window and/or a log slot in the BTT. |
| * We optimize for the common case where there are 256 lanes, one |
| * per-cpu. For larger systems we need to lock to share lanes. For now |
| * this implementation assumes the cost of maintaining an allocator for |
| * free lanes is on the order of the lock hold time, so it implements a |
| * static lane = cpu % num_lanes mapping. |
| * |
| * In the case of a BTT instance on top of a BLK namespace a lane may be |
| * acquired recursively. We lock on the first instance. |
| * |
| * In the case of a BTT instance on top of PMEM, we only acquire a lane |
| * for the BTT metadata updates. |
| */ |
| unsigned int nd_region_acquire_lane(struct nd_region *nd_region) |
| { |
| unsigned int cpu, lane; |
| |
| cpu = get_cpu(); |
| if (nd_region->num_lanes < nr_cpu_ids) { |
| struct nd_percpu_lane *ndl_lock, *ndl_count; |
| |
| lane = cpu % nd_region->num_lanes; |
| ndl_count = per_cpu_ptr(nd_region->lane, cpu); |
| ndl_lock = per_cpu_ptr(nd_region->lane, lane); |
| if (ndl_count->count++ == 0) |
| spin_lock(&ndl_lock->lock); |
| } else |
| lane = cpu; |
| |
| return lane; |
| } |
| EXPORT_SYMBOL(nd_region_acquire_lane); |
| |
| void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane) |
| { |
| if (nd_region->num_lanes < nr_cpu_ids) { |
| unsigned int cpu = get_cpu(); |
| struct nd_percpu_lane *ndl_lock, *ndl_count; |
| |
| ndl_count = per_cpu_ptr(nd_region->lane, cpu); |
| ndl_lock = per_cpu_ptr(nd_region->lane, lane); |
| if (--ndl_count->count == 0) |
| spin_unlock(&ndl_lock->lock); |
| put_cpu(); |
| } |
| put_cpu(); |
| } |
| EXPORT_SYMBOL(nd_region_release_lane); |
| |
| static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, |
| struct nd_region_desc *ndr_desc, struct device_type *dev_type, |
| const char *caller) |
| { |
| struct nd_region *nd_region; |
| struct device *dev; |
| void *region_buf; |
| unsigned int i; |
| int ro = 0; |
| |
| for (i = 0; i < ndr_desc->num_mappings; i++) { |
| struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i]; |
| struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| |
| if ((nd_mapping->start | nd_mapping->size) % SZ_4K) { |
| dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n", |
| caller, dev_name(&nvdimm->dev), i); |
| |
| return NULL; |
| } |
| |
| if (nvdimm->flags & NDD_UNARMED) |
| ro = 1; |
| } |
| |
| if (dev_type == &nd_blk_device_type) { |
| struct nd_blk_region_desc *ndbr_desc; |
| struct nd_blk_region *ndbr; |
| |
| ndbr_desc = to_blk_region_desc(ndr_desc); |
| ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping) |
| * ndr_desc->num_mappings, |
| GFP_KERNEL); |
| if (ndbr) { |
| nd_region = &ndbr->nd_region; |
| ndbr->enable = ndbr_desc->enable; |
| ndbr->do_io = ndbr_desc->do_io; |
| } |
| region_buf = ndbr; |
| } else { |
| nd_region = kzalloc(sizeof(struct nd_region) |
| + sizeof(struct nd_mapping) |
| * ndr_desc->num_mappings, |
| GFP_KERNEL); |
| region_buf = nd_region; |
| } |
| |
| if (!region_buf) |
| return NULL; |
| nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL); |
| if (nd_region->id < 0) |
| goto err_id; |
| |
| nd_region->lane = alloc_percpu(struct nd_percpu_lane); |
| if (!nd_region->lane) |
| goto err_percpu; |
| |
| for (i = 0; i < nr_cpu_ids; i++) { |
| struct nd_percpu_lane *ndl; |
| |
| ndl = per_cpu_ptr(nd_region->lane, i); |
| spin_lock_init(&ndl->lock); |
| ndl->count = 0; |
| } |
| |
| memcpy(nd_region->mapping, ndr_desc->nd_mapping, |
| sizeof(struct nd_mapping) * ndr_desc->num_mappings); |
| for (i = 0; i < ndr_desc->num_mappings; i++) { |
| struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i]; |
| struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| |
| get_device(&nvdimm->dev); |
| } |
| nd_region->ndr_mappings = ndr_desc->num_mappings; |
| nd_region->provider_data = ndr_desc->provider_data; |
| nd_region->nd_set = ndr_desc->nd_set; |
| nd_region->num_lanes = ndr_desc->num_lanes; |
| nd_region->flags = ndr_desc->flags; |
| nd_region->ro = ro; |
| nd_region->numa_node = ndr_desc->numa_node; |
| ida_init(&nd_region->ns_ida); |
| ida_init(&nd_region->btt_ida); |
| ida_init(&nd_region->pfn_ida); |
| ida_init(&nd_region->dax_ida); |
| dev = &nd_region->dev; |
| dev_set_name(dev, "region%d", nd_region->id); |
| dev->parent = &nvdimm_bus->dev; |
| dev->type = dev_type; |
| dev->groups = ndr_desc->attr_groups; |
| nd_region->ndr_size = resource_size(ndr_desc->res); |
| nd_region->ndr_start = ndr_desc->res->start; |
| nd_device_register(dev); |
| |
| return nd_region; |
| |
| err_percpu: |
| ida_simple_remove(®ion_ida, nd_region->id); |
| err_id: |
| kfree(region_buf); |
| return NULL; |
| } |
| |
| struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus, |
| struct nd_region_desc *ndr_desc) |
| { |
| ndr_desc->num_lanes = ND_MAX_LANES; |
| return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type, |
| __func__); |
| } |
| EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create); |
| |
| struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus, |
| struct nd_region_desc *ndr_desc) |
| { |
| if (ndr_desc->num_mappings > 1) |
| return NULL; |
| ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES); |
| return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type, |
| __func__); |
| } |
| EXPORT_SYMBOL_GPL(nvdimm_blk_region_create); |
| |
| struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus, |
| struct nd_region_desc *ndr_desc) |
| { |
| ndr_desc->num_lanes = ND_MAX_LANES; |
| return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type, |
| __func__); |
| } |
| EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create); |
| |
| void __exit nd_region_devs_exit(void) |
| { |
| ida_destroy(®ion_ida); |
| } |