diff options
Diffstat (limited to 'drivers/nvdimm/namespace_devs.c')
| -rw-r--r-- | drivers/nvdimm/namespace_devs.c | 2229 |
1 files changed, 2229 insertions, 0 deletions
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c new file mode 100644 index 000000000..c60ec0b37 --- /dev/null +++ b/drivers/nvdimm/namespace_devs.c @@ -0,0 +1,2229 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. + */ +#include <linux/module.h> +#include <linux/device.h> +#include <linux/sort.h> +#include <linux/slab.h> +#include <linux/list.h> +#include <linux/nd.h> +#include "nd-core.h" +#include "pmem.h" +#include "pfn.h" +#include "nd.h" + +static void namespace_io_release(struct device *dev) +{ + struct nd_namespace_io *nsio = to_nd_namespace_io(dev); + + kfree(nsio); +} + +static void namespace_pmem_release(struct device *dev) +{ + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + struct nd_region *nd_region = to_nd_region(dev->parent); + + if (nspm->id >= 0) + ida_simple_remove(&nd_region->ns_ida, nspm->id); + kfree(nspm->alt_name); + kfree(nspm->uuid); + kfree(nspm); +} + +static bool is_namespace_pmem(const struct device *dev); +static bool is_namespace_io(const struct device *dev); + +static int is_uuid_busy(struct device *dev, void *data) +{ + uuid_t *uuid1 = data, *uuid2 = NULL; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + uuid2 = nspm->uuid; + } else if (is_nd_btt(dev)) { + struct nd_btt *nd_btt = to_nd_btt(dev); + + uuid2 = nd_btt->uuid; + } else if (is_nd_pfn(dev)) { + struct nd_pfn *nd_pfn = to_nd_pfn(dev); + + uuid2 = nd_pfn->uuid; + } + + if (uuid2 && uuid_equal(uuid1, uuid2)) + return -EBUSY; + + return 0; +} + +static int is_namespace_uuid_busy(struct device *dev, void *data) +{ + if (is_nd_region(dev)) + return device_for_each_child(dev, data, is_uuid_busy); + return 0; +} + +/** + * nd_is_uuid_unique - verify that no other namespace has @uuid + * @dev: any device on a nvdimm_bus + * @uuid: uuid to check + */ +bool nd_is_uuid_unique(struct device *dev, uuid_t *uuid) +{ + struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); + + if (!nvdimm_bus) + return false; + WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev)); + if (device_for_each_child(&nvdimm_bus->dev, uuid, + is_namespace_uuid_busy) != 0) + return false; + return true; +} + +bool pmem_should_map_pages(struct device *dev) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + struct nd_namespace_common *ndns = to_ndns(dev); + struct nd_namespace_io *nsio; + + if (!IS_ENABLED(CONFIG_ZONE_DEVICE)) + return false; + + if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags)) + return false; + + if (is_nd_pfn(dev) || is_nd_btt(dev)) + return false; + + if (ndns->force_raw) + return false; + + nsio = to_nd_namespace_io(dev); + if (region_intersects(nsio->res.start, resource_size(&nsio->res), + IORESOURCE_SYSTEM_RAM, + IORES_DESC_NONE) == REGION_MIXED) + return false; + + return ARCH_MEMREMAP_PMEM == MEMREMAP_WB; +} +EXPORT_SYMBOL(pmem_should_map_pages); + +unsigned int pmem_sector_size(struct nd_namespace_common *ndns) +{ + if (is_namespace_pmem(&ndns->dev)) { + struct nd_namespace_pmem *nspm; + + nspm = to_nd_namespace_pmem(&ndns->dev); + if (nspm->lbasize == 0 || nspm->lbasize == 512) + /* default */; + else if (nspm->lbasize == 4096) + return 4096; + else + dev_WARN(&ndns->dev, "unsupported sector size: %ld\n", + nspm->lbasize); + } + + /* + * There is no namespace label (is_namespace_io()), or the label + * indicates the default sector size. + */ + return 512; +} +EXPORT_SYMBOL(pmem_sector_size); + +const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns, + char *name) +{ + struct nd_region *nd_region = to_nd_region(ndns->dev.parent); + const char *suffix = NULL; + + if (ndns->claim && is_nd_btt(ndns->claim)) + suffix = "s"; + + if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) { + int nsidx = 0; + + if (is_namespace_pmem(&ndns->dev)) { + struct nd_namespace_pmem *nspm; + + nspm = to_nd_namespace_pmem(&ndns->dev); + nsidx = nspm->id; + } + + if (nsidx) + sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx, + suffix ? suffix : ""); + else + sprintf(name, "pmem%d%s", nd_region->id, + suffix ? suffix : ""); + } else { + return NULL; + } + + return name; +} +EXPORT_SYMBOL(nvdimm_namespace_disk_name); + +const uuid_t *nd_dev_to_uuid(struct device *dev) +{ + if (dev && is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + return nspm->uuid; + } + return &uuid_null; +} +EXPORT_SYMBOL(nd_dev_to_uuid); + +static ssize_t nstype_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + + return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region)); +} +static DEVICE_ATTR_RO(nstype); + +static ssize_t __alt_name_store(struct device *dev, const char *buf, + const size_t len) +{ + char *input, *pos, *alt_name, **ns_altname; + ssize_t rc; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + ns_altname = &nspm->alt_name; + } else + return -ENXIO; + + if (dev->driver || to_ndns(dev)->claim) + return -EBUSY; + + input = kstrndup(buf, len, GFP_KERNEL); + if (!input) + return -ENOMEM; + + pos = strim(input); + if (strlen(pos) + 1 > NSLABEL_NAME_LEN) { + rc = -EINVAL; + goto out; + } + + alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL); + if (!alt_name) { + rc = -ENOMEM; + goto out; + } + kfree(*ns_altname); + *ns_altname = alt_name; + sprintf(*ns_altname, "%s", pos); + rc = len; + +out: + kfree(input); + return rc; +} + +static int nd_namespace_label_update(struct nd_region *nd_region, + struct device *dev) +{ + dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim, + "namespace must be idle during label update\n"); + if (dev->driver || to_ndns(dev)->claim) + return 0; + + /* + * Only allow label writes that will result in a valid namespace + * or deletion of an existing namespace. + */ + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + resource_size_t size = resource_size(&nspm->nsio.res); + + if (size == 0 && nspm->uuid) + /* delete allocation */; + else if (!nspm->uuid) + return 0; + + return nd_pmem_namespace_label_update(nd_region, nspm, size); + } else + return -ENXIO; +} + +static ssize_t alt_name_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + ssize_t rc; + + device_lock(dev); + nvdimm_bus_lock(dev); + wait_nvdimm_bus_probe_idle(dev); + rc = __alt_name_store(dev, buf, len); + if (rc >= 0) + rc = nd_namespace_label_update(nd_region, dev); + dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc); + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return rc < 0 ? rc : len; +} + +static ssize_t alt_name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + char *ns_altname; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + ns_altname = nspm->alt_name; + } else + return -ENXIO; + + return sprintf(buf, "%s\n", ns_altname ? ns_altname : ""); +} +static DEVICE_ATTR_RW(alt_name); + +static int scan_free(struct nd_region *nd_region, + struct nd_mapping *nd_mapping, struct nd_label_id *label_id, + resource_size_t n) +{ + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + int rc = 0; + + while (n) { + struct resource *res, *last; + + last = NULL; + for_each_dpa_resource(ndd, res) + if (strcmp(res->name, label_id->id) == 0) + last = res; + res = last; + if (!res) + return 0; + + if (n >= resource_size(res)) { + n -= resource_size(res); + nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc); + nvdimm_free_dpa(ndd, res); + /* retry with last resource deleted */ + continue; + } + + rc = adjust_resource(res, res->start, resource_size(res) - n); + if (rc == 0) + res->flags |= DPA_RESOURCE_ADJUSTED; + nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc); + break; + } + + return rc; +} + +/** + * shrink_dpa_allocation - for each dimm in region free n bytes for label_id + * @nd_region: the set of dimms to reclaim @n bytes from + * @label_id: unique identifier for the namespace consuming this dpa range + * @n: number of bytes per-dimm to release + * + * Assumes resources are ordered. Starting from the end try to + * adjust_resource() the allocation to @n, but if @n is larger than the + * allocation delete it and find the 'new' last allocation in the label + * set. + */ +static int shrink_dpa_allocation(struct nd_region *nd_region, + struct nd_label_id *label_id, resource_size_t n) +{ + int i; + + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + int rc; + + rc = scan_free(nd_region, nd_mapping, label_id, n); + if (rc) + return rc; + } + + return 0; +} + +static resource_size_t init_dpa_allocation(struct nd_label_id *label_id, + struct nd_region *nd_region, struct nd_mapping *nd_mapping, + resource_size_t n) +{ + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct resource *res; + int rc = 0; + + /* first resource allocation for this label-id or dimm */ + res = nvdimm_allocate_dpa(ndd, label_id, nd_mapping->start, n); + if (!res) + rc = -EBUSY; + + nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc); + return rc ? n : 0; +} + + +/** + * space_valid() - validate free dpa space against constraints + * @nd_region: hosting region of the free space + * @ndd: dimm device data for debug + * @label_id: namespace id to allocate space + * @prev: potential allocation that precedes free space + * @next: allocation that follows the given free space range + * @exist: first allocation with same id in the mapping + * @n: range that must satisfied for pmem allocations + * @valid: free space range to validate + * + * BLK-space is valid as long as it does not precede a PMEM + * allocation in a given region. PMEM-space must be contiguous + * and adjacent to an existing allocation (if one + * exists). If reserving PMEM any space is valid. + */ +static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd, + struct nd_label_id *label_id, struct resource *prev, + struct resource *next, struct resource *exist, + resource_size_t n, struct resource *valid) +{ + bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0; + unsigned long align; + + align = nd_region->align / nd_region->ndr_mappings; + valid->start = ALIGN(valid->start, align); + valid->end = ALIGN_DOWN(valid->end + 1, align) - 1; + + if (valid->start >= valid->end) + goto invalid; + + if (is_reserve) + return; + + /* allocation needs to be contiguous, so this is all or nothing */ + if (resource_size(valid) < n) + goto invalid; + + /* we've got all the space we need and no existing allocation */ + if (!exist) + return; + + /* allocation needs to be contiguous with the existing namespace */ + if (valid->start == exist->end + 1 + || valid->end == exist->start - 1) + return; + + invalid: + /* truncate @valid size to 0 */ + valid->end = valid->start - 1; +} + +enum alloc_loc { + ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER, +}; + +static resource_size_t scan_allocate(struct nd_region *nd_region, + struct nd_mapping *nd_mapping, struct nd_label_id *label_id, + resource_size_t n) +{ + resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct resource *res, *exist = NULL, valid; + const resource_size_t to_allocate = n; + int first; + + for_each_dpa_resource(ndd, res) + if (strcmp(label_id->id, res->name) == 0) + exist = res; + + valid.start = nd_mapping->start; + valid.end = mapping_end; + valid.name = "free space"; + retry: + first = 0; + for_each_dpa_resource(ndd, res) { + struct resource *next = res->sibling, *new_res = NULL; + resource_size_t allocate, available = 0; + enum alloc_loc loc = ALLOC_ERR; + const char *action; + int rc = 0; + + /* ignore resources outside this nd_mapping */ + if (res->start > mapping_end) + continue; + if (res->end < nd_mapping->start) + continue; + + /* space at the beginning of the mapping */ + if (!first++ && res->start > nd_mapping->start) { + valid.start = nd_mapping->start; + valid.end = res->start - 1; + space_valid(nd_region, ndd, label_id, NULL, next, exist, + to_allocate, &valid); + available = resource_size(&valid); + if (available) + loc = ALLOC_BEFORE; + } + + /* space between allocations */ + if (!loc && next) { + valid.start = res->start + resource_size(res); + valid.end = min(mapping_end, next->start - 1); + space_valid(nd_region, ndd, label_id, res, next, exist, + to_allocate, &valid); + available = resource_size(&valid); + if (available) + loc = ALLOC_MID; + } + + /* space at the end of the mapping */ + if (!loc && !next) { + valid.start = res->start + resource_size(res); + valid.end = mapping_end; + space_valid(nd_region, ndd, label_id, res, next, exist, + to_allocate, &valid); + available = resource_size(&valid); + if (available) + loc = ALLOC_AFTER; + } + + if (!loc || !available) + continue; + allocate = min(available, n); + switch (loc) { + case ALLOC_BEFORE: + if (strcmp(res->name, label_id->id) == 0) { + /* adjust current resource up */ + rc = adjust_resource(res, res->start - allocate, + resource_size(res) + allocate); + action = "cur grow up"; + } else + action = "allocate"; + break; + case ALLOC_MID: + if (strcmp(next->name, label_id->id) == 0) { + /* adjust next resource up */ + rc = adjust_resource(next, next->start + - allocate, resource_size(next) + + allocate); + new_res = next; + action = "next grow up"; + } else if (strcmp(res->name, label_id->id) == 0) { + action = "grow down"; + } else + action = "allocate"; + break; + case ALLOC_AFTER: + if (strcmp(res->name, label_id->id) == 0) + action = "grow down"; + else + action = "allocate"; + break; + default: + return n; + } + + if (strcmp(action, "allocate") == 0) { + new_res = nvdimm_allocate_dpa(ndd, label_id, + valid.start, allocate); + if (!new_res) + rc = -EBUSY; + } else if (strcmp(action, "grow down") == 0) { + /* adjust current resource down */ + rc = adjust_resource(res, res->start, resource_size(res) + + allocate); + if (rc == 0) + res->flags |= DPA_RESOURCE_ADJUSTED; + } + + if (!new_res) + new_res = res; + + nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n", + action, loc, rc); + + if (rc) + return n; + + n -= allocate; + if (n) { + /* + * Retry scan with newly inserted resources. + * For example, if we did an ALLOC_BEFORE + * insertion there may also have been space + * available for an ALLOC_AFTER insertion, so we + * need to check this same resource again + */ + goto retry; + } else + return 0; + } + + if (n == to_allocate) + return init_dpa_allocation(label_id, nd_region, nd_mapping, n); + return n; +} + +static int merge_dpa(struct nd_region *nd_region, + struct nd_mapping *nd_mapping, struct nd_label_id *label_id) +{ + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct resource *res; + + if (strncmp("pmem", label_id->id, 4) == 0) + return 0; + retry: + for_each_dpa_resource(ndd, res) { + int rc; + struct resource *next = res->sibling; + resource_size_t end = res->start + resource_size(res); + + if (!next || strcmp(res->name, label_id->id) != 0 + || strcmp(next->name, label_id->id) != 0 + || end != next->start) + continue; + end += resource_size(next); + nvdimm_free_dpa(ndd, next); + rc = adjust_resource(res, res->start, end - res->start); + nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc); + if (rc) + return rc; + res->flags |= DPA_RESOURCE_ADJUSTED; + goto retry; + } + + return 0; +} + +int __reserve_free_pmem(struct device *dev, void *data) +{ + struct nvdimm *nvdimm = data; + struct nd_region *nd_region; + struct nd_label_id label_id; + int i; + + if (!is_memory(dev)) + return 0; + + nd_region = to_nd_region(dev); + if (nd_region->ndr_mappings == 0) + return 0; + + memset(&label_id, 0, sizeof(label_id)); + strcat(label_id.id, "pmem-reserve"); + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + resource_size_t n, rem = 0; + + if (nd_mapping->nvdimm != nvdimm) + continue; + + n = nd_pmem_available_dpa(nd_region, nd_mapping); + if (n == 0) + return 0; + rem = scan_allocate(nd_region, nd_mapping, &label_id, n); + dev_WARN_ONCE(&nd_region->dev, rem, + "pmem reserve underrun: %#llx of %#llx bytes\n", + (unsigned long long) n - rem, + (unsigned long long) n); + return rem ? -ENXIO : 0; + } + + return 0; +} + +void release_free_pmem(struct nvdimm_bus *nvdimm_bus, + struct nd_mapping *nd_mapping) +{ + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct resource *res, *_res; + + for_each_dpa_resource_safe(ndd, res, _res) + if (strcmp(res->name, "pmem-reserve") == 0) + nvdimm_free_dpa(ndd, res); +} + +/** + * grow_dpa_allocation - for each dimm allocate n bytes for @label_id + * @nd_region: the set of dimms to allocate @n more bytes from + * @label_id: unique identifier for the namespace consuming this dpa range + * @n: number of bytes per-dimm to add to the existing allocation + * + * Assumes resources are ordered. For BLK regions, first consume + * BLK-only available DPA free space, then consume PMEM-aliased DPA + * space starting at the highest DPA. For PMEM regions start + * allocations from the start of an interleave set and end at the first + * BLK allocation or the end of the interleave set, whichever comes + * first. + */ +static int grow_dpa_allocation(struct nd_region *nd_region, + struct nd_label_id *label_id, resource_size_t n) +{ + int i; + + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + resource_size_t rem = n; + int rc; + + rem = scan_allocate(nd_region, nd_mapping, label_id, rem); + dev_WARN_ONCE(&nd_region->dev, rem, + "allocation underrun: %#llx of %#llx bytes\n", + (unsigned long long) n - rem, + (unsigned long long) n); + if (rem) + return -ENXIO; + + rc = merge_dpa(nd_region, nd_mapping, label_id); + if (rc) + return rc; + } + + return 0; +} + +static void nd_namespace_pmem_set_resource(struct nd_region *nd_region, + struct nd_namespace_pmem *nspm, resource_size_t size) +{ + struct resource *res = &nspm->nsio.res; + resource_size_t offset = 0; + + if (size && !nspm->uuid) { + WARN_ON_ONCE(1); + size = 0; + } + + if (size && nspm->uuid) { + struct nd_mapping *nd_mapping = &nd_region->mapping[0]; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct nd_label_id label_id; + struct resource *res; + + if (!ndd) { + size = 0; + goto out; + } + + nd_label_gen_id(&label_id, nspm->uuid, 0); + + /* calculate a spa offset from the dpa allocation offset */ + for_each_dpa_resource(ndd, res) + if (strcmp(res->name, label_id.id) == 0) { + offset = (res->start - nd_mapping->start) + * nd_region->ndr_mappings; + goto out; + } + + WARN_ON_ONCE(1); + size = 0; + } + + out: + res->start = nd_region->ndr_start + offset; + res->end = res->start + size - 1; +} + +static bool uuid_not_set(const uuid_t *uuid, struct device *dev, + const char *where) +{ + if (!uuid) { + dev_dbg(dev, "%s: uuid not set\n", where); + return true; + } + return false; +} + +static ssize_t __size_store(struct device *dev, unsigned long long val) +{ + resource_size_t allocated = 0, available = 0; + struct nd_region *nd_region = to_nd_region(dev->parent); + struct nd_namespace_common *ndns = to_ndns(dev); + struct nd_mapping *nd_mapping; + struct nvdimm_drvdata *ndd; + struct nd_label_id label_id; + u32 flags = 0, remainder; + int rc, i, id = -1; + uuid_t *uuid = NULL; + + if (dev->driver || ndns->claim) + return -EBUSY; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + uuid = nspm->uuid; + id = nspm->id; + } + + /* + * We need a uuid for the allocation-label and dimm(s) on which + * to store the label. + */ + if (uuid_not_set(uuid, dev, __func__)) + return -ENXIO; + if (nd_region->ndr_mappings == 0) { + dev_dbg(dev, "not associated with dimm(s)\n"); + return -ENXIO; + } + + div_u64_rem(val, nd_region->align, &remainder); + if (remainder) { + dev_dbg(dev, "%llu is not %ldK aligned\n", val, + nd_region->align / SZ_1K); + return -EINVAL; + } + + nd_label_gen_id(&label_id, uuid, flags); + for (i = 0; i < nd_region->ndr_mappings; i++) { + nd_mapping = &nd_region->mapping[i]; + ndd = to_ndd(nd_mapping); + + /* + * All dimms in an interleave set, need to be enabled + * for the size to be changed. + */ + if (!ndd) + return -ENXIO; + + allocated += nvdimm_allocated_dpa(ndd, &label_id); + } + available = nd_region_allocatable_dpa(nd_region); + + if (val > available + allocated) + return -ENOSPC; + + if (val == allocated) + return 0; + + val = div_u64(val, nd_region->ndr_mappings); + allocated = div_u64(allocated, nd_region->ndr_mappings); + if (val < allocated) + rc = shrink_dpa_allocation(nd_region, &label_id, + allocated - val); + else + rc = grow_dpa_allocation(nd_region, &label_id, val - allocated); + + if (rc) + return rc; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + nd_namespace_pmem_set_resource(nd_region, nspm, + val * nd_region->ndr_mappings); + } + + /* + * Try to delete the namespace if we deleted all of its + * allocation, this is not the seed or 0th device for the + * region, and it is not actively claimed by a btt, pfn, or dax + * instance. + */ + if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim) + nd_device_unregister(dev, ND_ASYNC); + + return rc; +} + +static ssize_t size_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + unsigned long long val; + int rc; + + rc = kstrtoull(buf, 0, &val); + if (rc) + return rc; + + device_lock(dev); + nvdimm_bus_lock(dev); + wait_nvdimm_bus_probe_idle(dev); + rc = __size_store(dev, val); + if (rc >= 0) + rc = nd_namespace_label_update(nd_region, dev); + + /* setting size zero == 'delete namespace' */ + if (rc == 0 && val == 0 && is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + kfree(nspm->uuid); + nspm->uuid = NULL; + } + + dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc); + + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return rc < 0 ? rc : len; +} + +resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns) +{ + struct device *dev = &ndns->dev; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + return resource_size(&nspm->nsio.res); + } else if (is_namespace_io(dev)) { + struct nd_namespace_io *nsio = to_nd_namespace_io(dev); + + return resource_size(&nsio->res); + } else + WARN_ONCE(1, "unknown namespace type\n"); + return 0; +} + +resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns) +{ + resource_size_t size; + + nvdimm_bus_lock(&ndns->dev); + size = __nvdimm_namespace_capacity(ndns); + nvdimm_bus_unlock(&ndns->dev); + + return size; +} +EXPORT_SYMBOL(nvdimm_namespace_capacity); + +bool nvdimm_namespace_locked(struct nd_namespace_common *ndns) +{ + int i; + bool locked = false; + struct device *dev = &ndns->dev; + struct nd_region *nd_region = to_nd_region(dev->parent); + + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + struct nvdimm *nvdimm = nd_mapping->nvdimm; + + if (test_bit(NDD_LOCKED, &nvdimm->flags)) { + dev_dbg(dev, "%s locked\n", nvdimm_name(nvdimm)); + locked = true; + } + } + return locked; +} +EXPORT_SYMBOL(nvdimm_namespace_locked); + +static ssize_t size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%llu\n", (unsigned long long) + nvdimm_namespace_capacity(to_ndns(dev))); +} +static DEVICE_ATTR(size, 0444, size_show, size_store); + +static uuid_t *namespace_to_uuid(struct device *dev) +{ + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + return nspm->uuid; + } + return ERR_PTR(-ENXIO); +} + +static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + uuid_t *uuid = namespace_to_uuid(dev); + + if (IS_ERR(uuid)) + return PTR_ERR(uuid); + if (uuid) + return sprintf(buf, "%pUb\n", uuid); + return sprintf(buf, "\n"); +} + +/** + * namespace_update_uuid - check for a unique uuid and whether we're "renaming" + * @nd_region: parent region so we can updates all dimms in the set + * @dev: namespace type for generating label_id + * @new_uuid: incoming uuid + * @old_uuid: reference to the uuid storage location in the namespace object + */ +static int namespace_update_uuid(struct nd_region *nd_region, + struct device *dev, uuid_t *new_uuid, + uuid_t **old_uuid) +{ + struct nd_label_id old_label_id; + struct nd_label_id new_label_id; + int i; + + if (!nd_is_uuid_unique(dev, new_uuid)) + return -EINVAL; + + if (*old_uuid == NULL) + goto out; + + /* + * If we've already written a label with this uuid, then it's + * too late to rename because we can't reliably update the uuid + * without losing the old namespace. Userspace must delete this + * namespace to abandon the old uuid. + */ + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + + /* + * This check by itself is sufficient because old_uuid + * would be NULL above if this uuid did not exist in the + * currently written set. + * + * FIXME: can we delete uuid with zero dpa allocated? + */ + if (list_empty(&nd_mapping->labels)) + return -EBUSY; + } + + nd_label_gen_id(&old_label_id, *old_uuid, 0); + nd_label_gen_id(&new_label_id, new_uuid, 0); + 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); + struct nd_label_ent *label_ent; + struct resource *res; + + for_each_dpa_resource(ndd, res) + if (strcmp(res->name, old_label_id.id) == 0) + sprintf((void *) res->name, "%s", + new_label_id.id); + + mutex_lock(&nd_mapping->lock); + list_for_each_entry(label_ent, &nd_mapping->labels, list) { + struct nd_namespace_label *nd_label = label_ent->label; + struct nd_label_id label_id; + uuid_t uuid; + + if (!nd_label) + continue; + nsl_get_uuid(ndd, nd_label, &uuid); + nd_label_gen_id(&label_id, &uuid, + nsl_get_flags(ndd, nd_label)); + if (strcmp(old_label_id.id, label_id.id) == 0) + set_bit(ND_LABEL_REAP, &label_ent->flags); + } + mutex_unlock(&nd_mapping->lock); + } + kfree(*old_uuid); + out: + *old_uuid = new_uuid; + return 0; +} + +static ssize_t uuid_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + uuid_t *uuid = NULL; + uuid_t **ns_uuid; + ssize_t rc = 0; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + ns_uuid = &nspm->uuid; + } else + return -ENXIO; + + device_lock(dev); + nvdimm_bus_lock(dev); + wait_nvdimm_bus_probe_idle(dev); + if (to_ndns(dev)->claim) + rc = -EBUSY; + if (rc >= 0) + rc = nd_uuid_store(dev, &uuid, buf, len); + if (rc >= 0) + rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid); + if (rc >= 0) + rc = nd_namespace_label_update(nd_region, dev); + else + kfree(uuid); + dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, + buf[len - 1] == '\n' ? "" : "\n"); + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return rc < 0 ? rc : len; +} +static DEVICE_ATTR_RW(uuid); + +static ssize_t resource_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct resource *res; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + res = &nspm->nsio.res; + } else if (is_namespace_io(dev)) { + struct nd_namespace_io *nsio = to_nd_namespace_io(dev); + + res = &nsio->res; + } else + return -ENXIO; + + /* no address to convey if the namespace has no allocation */ + if (resource_size(res) == 0) + return -ENXIO; + return sprintf(buf, "%#llx\n", (unsigned long long) res->start); +} +static DEVICE_ATTR_ADMIN_RO(resource); + +static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 }; + +static ssize_t sector_size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + return nd_size_select_show(nspm->lbasize, + pmem_lbasize_supported, buf); + } + return -ENXIO; +} + +static ssize_t sector_size_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + const unsigned long *supported; + unsigned long *lbasize; + ssize_t rc = 0; + + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + lbasize = &nspm->lbasize; + supported = pmem_lbasize_supported; + } else + return -ENXIO; + + device_lock(dev); + nvdimm_bus_lock(dev); + if (to_ndns(dev)->claim) + rc = -EBUSY; + if (rc >= 0) + rc = nd_size_select_store(dev, buf, lbasize, supported); + if (rc >= 0) + rc = nd_namespace_label_update(nd_region, dev); + dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote", + buf, buf[len - 1] == '\n' ? "" : "\n"); + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return rc ? rc : len; +} +static DEVICE_ATTR_RW(sector_size); + +static ssize_t dpa_extents_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + struct nd_label_id label_id; + uuid_t *uuid = NULL; + int count = 0, i; + u32 flags = 0; + + nvdimm_bus_lock(dev); + if (is_namespace_pmem(dev)) { + struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); + + uuid = nspm->uuid; + flags = 0; + } + + if (!uuid) + goto out; + + nd_label_gen_id(&label_id, uuid, flags); + 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); + struct resource *res; + + for_each_dpa_resource(ndd, res) + if (strcmp(res->name, label_id.id) == 0) + count++; + } + out: + nvdimm_bus_unlock(dev); + + return sprintf(buf, "%d\n", count); +} +static DEVICE_ATTR_RO(dpa_extents); + +static int btt_claim_class(struct device *dev) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + int i, loop_bitmask = 0; + + 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); + struct nd_namespace_index *nsindex; + + /* + * If any of the DIMMs do not support labels the only + * possible BTT format is v1. + */ + if (!ndd) { + loop_bitmask = 0; + break; + } + + nsindex = to_namespace_index(ndd, ndd->ns_current); + if (nsindex == NULL) + loop_bitmask |= 1; + else { + /* check whether existing labels are v1.1 or v1.2 */ + if (__le16_to_cpu(nsindex->major) == 1 + && __le16_to_cpu(nsindex->minor) == 1) + loop_bitmask |= 2; + else + loop_bitmask |= 4; + } + } + /* + * If nsindex is null loop_bitmask's bit 0 will be set, and if an index + * block is found, a v1.1 label for any mapping will set bit 1, and a + * v1.2 label will set bit 2. + * + * At the end of the loop, at most one of the three bits must be set. + * If multiple bits were set, it means the different mappings disagree + * about their labels, and this must be cleaned up first. + * + * If all the label index blocks are found to agree, nsindex of NULL + * implies labels haven't been initialized yet, and when they will, + * they will be of the 1.2 format, so we can assume BTT2.0 + * + * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are + * found, we enforce BTT2.0 + * + * If the loop was never entered, default to BTT1.1 (legacy namespaces) + */ + switch (loop_bitmask) { + case 0: + case 2: + return NVDIMM_CCLASS_BTT; + case 1: + case 4: + return NVDIMM_CCLASS_BTT2; + default: + return -ENXIO; + } +} + +static ssize_t holder_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_namespace_common *ndns = to_ndns(dev); + ssize_t rc; + + device_lock(dev); + rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : ""); + device_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(holder); + +static int __holder_class_store(struct device *dev, const char *buf) +{ + struct nd_namespace_common *ndns = to_ndns(dev); + + if (dev->driver || ndns->claim) + return -EBUSY; + + if (sysfs_streq(buf, "btt")) { + int rc = btt_claim_class(dev); + + if (rc < NVDIMM_CCLASS_NONE) + return rc; + ndns->claim_class = rc; + } else if (sysfs_streq(buf, "pfn")) + ndns->claim_class = NVDIMM_CCLASS_PFN; + else if (sysfs_streq(buf, "dax")) + ndns->claim_class = NVDIMM_CCLASS_DAX; + else if (sysfs_streq(buf, "")) + ndns->claim_class = NVDIMM_CCLASS_NONE; + else + return -EINVAL; + + return 0; +} + +static ssize_t holder_class_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_region *nd_region = to_nd_region(dev->parent); + int rc; + + device_lock(dev); + nvdimm_bus_lock(dev); + wait_nvdimm_bus_probe_idle(dev); + rc = __holder_class_store(dev, buf); + if (rc >= 0) + rc = nd_namespace_label_update(nd_region, dev); + dev_dbg(dev, "%s(%d)\n", rc < 0 ? "fail " : "", rc); + nvdimm_bus_unlock(dev); + device_unlock(dev); + + return rc < 0 ? rc : len; +} + +static ssize_t holder_class_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_namespace_common *ndns = to_ndns(dev); + ssize_t rc; + + device_lock(dev); + if (ndns->claim_class == NVDIMM_CCLASS_NONE) + rc = sprintf(buf, "\n"); + else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) || + (ndns->claim_class == NVDIMM_CCLASS_BTT2)) + rc = sprintf(buf, "btt\n"); + else if (ndns->claim_class == NVDIMM_CCLASS_PFN) + rc = sprintf(buf, "pfn\n"); + else if (ndns->claim_class == NVDIMM_CCLASS_DAX) + rc = sprintf(buf, "dax\n"); + else + rc = sprintf(buf, "<unknown>\n"); + device_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RW(holder_class); + +static ssize_t mode_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_namespace_common *ndns = to_ndns(dev); + struct device *claim; + char *mode; + ssize_t rc; + + device_lock(dev); + claim = ndns->claim; + if (claim && is_nd_btt(claim)) + mode = "safe"; + else if (claim && is_nd_pfn(claim)) + mode = "memory"; + else if (claim && is_nd_dax(claim)) + mode = "dax"; + else if (!claim && pmem_should_map_pages(dev)) + mode = "memory"; + else + mode = "raw"; + rc = sprintf(buf, "%s\n", mode); + device_unlock(dev); + + return rc; +} +static DEVICE_ATTR_RO(mode); + +static ssize_t force_raw_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + bool force_raw; + int rc = strtobool(buf, &force_raw); + + if (rc) + return rc; + + to_ndns(dev)->force_raw = force_raw; + return len; +} + +static ssize_t force_raw_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", to_ndns(dev)->force_raw); +} +static DEVICE_ATTR_RW(force_raw); + +static struct attribute *nd_namespace_attributes[] = { + &dev_attr_nstype.attr, + &dev_attr_size.attr, + &dev_attr_mode.attr, + &dev_attr_uuid.attr, + &dev_attr_holder.attr, + &dev_attr_resource.attr, + &dev_attr_alt_name.attr, + &dev_attr_force_raw.attr, + &dev_attr_sector_size.attr, + &dev_attr_dpa_extents.attr, + &dev_attr_holder_class.attr, + NULL, +}; + +static umode_t namespace_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + + if (is_namespace_pmem(dev)) { + if (a == &dev_attr_size.attr) + return 0644; + + return a->mode; + } + + /* base is_namespace_io() attributes */ + if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr || + a == &dev_attr_holder.attr || a == &dev_attr_holder_class.attr || + a == &dev_attr_force_raw.attr || a == &dev_attr_mode.attr || + a == &dev_attr_resource.attr) + return a->mode; + + return 0; +} + +static struct attribute_group nd_namespace_attribute_group = { + .attrs = nd_namespace_attributes, + .is_visible = namespace_visible, +}; + +static const struct attribute_group *nd_namespace_attribute_groups[] = { + &nd_device_attribute_group, + &nd_namespace_attribute_group, + &nd_numa_attribute_group, + NULL, +}; + +static const struct device_type namespace_io_device_type = { + .name = "nd_namespace_io", + .release = namespace_io_release, + .groups = nd_namespace_attribute_groups, +}; + +static const struct device_type namespace_pmem_device_type = { + .name = "nd_namespace_pmem", + .release = namespace_pmem_release, + .groups = nd_namespace_attribute_groups, +}; + +static bool is_namespace_pmem(const struct device *dev) +{ + return dev ? dev->type == &namespace_pmem_device_type : false; +} + +static bool is_namespace_io(const struct device *dev) +{ + return dev ? dev->type == &namespace_io_device_type : false; +} + +struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev) +{ + struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL; + struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL; + struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL; + struct nd_namespace_common *ndns = NULL; + resource_size_t size; + + if (nd_btt || nd_pfn || nd_dax) { + if (nd_btt) + ndns = nd_btt->ndns; + else if (nd_pfn) + ndns = nd_pfn->ndns; + else if (nd_dax) + ndns = nd_dax->nd_pfn.ndns; + + if (!ndns) + return ERR_PTR(-ENODEV); + + /* + * Flush any in-progess probes / removals in the driver + * for the raw personality of this namespace. + */ + device_lock(&ndns->dev); + device_unlock(&ndns->dev); + if (ndns->dev.driver) { + dev_dbg(&ndns->dev, "is active, can't bind %s\n", + dev_name(dev)); + return ERR_PTR(-EBUSY); + } + if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev, + "host (%s) vs claim (%s) mismatch\n", + dev_name(dev), + dev_name(ndns->claim))) + return ERR_PTR(-ENXIO); + } else { + ndns = to_ndns(dev); + if (ndns->claim) { + dev_dbg(dev, "claimed by %s, failing probe\n", + dev_name(ndns->claim)); + + return ERR_PTR(-ENXIO); + } + } + + if (nvdimm_namespace_locked(ndns)) + return ERR_PTR(-EACCES); + + size = nvdimm_namespace_capacity(ndns); + if (size < ND_MIN_NAMESPACE_SIZE) { + dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n", + &size, ND_MIN_NAMESPACE_SIZE); + return ERR_PTR(-ENODEV); + } + + /* + * Note, alignment validation for fsdax and devdax mode + * namespaces happens in nd_pfn_validate() where infoblock + * padding parameters can be applied. + */ + if (pmem_should_map_pages(dev)) { + struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); + struct resource *res = &nsio->res; + + if (!IS_ALIGNED(res->start | (res->end + 1), + memremap_compat_align())) { + dev_err(&ndns->dev, "%pr misaligned, unable to map\n", res); + return ERR_PTR(-EOPNOTSUPP); + } + } + + if (is_namespace_pmem(&ndns->dev)) { + struct nd_namespace_pmem *nspm; + + nspm = to_nd_namespace_pmem(&ndns->dev); + if (uuid_not_set(nspm->uuid, &ndns->dev, __func__)) + return ERR_PTR(-ENODEV); + } + + return ndns; +} +EXPORT_SYMBOL(nvdimm_namespace_common_probe); + +int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns, + resource_size_t size) +{ + return devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev), size); +} +EXPORT_SYMBOL_GPL(devm_namespace_enable); + +void devm_namespace_disable(struct device *dev, struct nd_namespace_common *ndns) +{ + devm_nsio_disable(dev, to_nd_namespace_io(&ndns->dev)); +} +EXPORT_SYMBOL_GPL(devm_namespace_disable); + +static struct device **create_namespace_io(struct nd_region *nd_region) +{ + struct nd_namespace_io *nsio; + struct device *dev, **devs; + struct resource *res; + + nsio = kzalloc(sizeof(*nsio), GFP_KERNEL); + if (!nsio) + return NULL; + + devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL); + if (!devs) { + kfree(nsio); + return NULL; + } + + dev = &nsio->common.dev; + dev->type = &namespace_io_device_type; + dev->parent = &nd_region->dev; + res = &nsio->res; + res->name = dev_name(&nd_region->dev); + res->flags = IORESOURCE_MEM; + res->start = nd_region->ndr_start; + res->end = res->start + nd_region->ndr_size - 1; + + devs[0] = dev; + return devs; +} + +static bool has_uuid_at_pos(struct nd_region *nd_region, const uuid_t *uuid, + u64 cookie, u16 pos) +{ + struct nd_namespace_label *found = NULL; + int i; + + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_mapping *nd_mapping = &nd_region->mapping[i]; + struct nd_interleave_set *nd_set = nd_region->nd_set; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct nd_label_ent *label_ent; + bool found_uuid = false; + + list_for_each_entry(label_ent, &nd_mapping->labels, list) { + struct nd_namespace_label *nd_label = label_ent->label; + u16 position; + + if (!nd_label) + continue; + position = nsl_get_position(ndd, nd_label); + + if (!nsl_validate_isetcookie(ndd, nd_label, cookie)) + continue; + + if (!nsl_uuid_equal(ndd, nd_label, uuid)) + continue; + + if (!nsl_validate_type_guid(ndd, nd_label, + &nd_set->type_guid)) + continue; + + if (found_uuid) { + dev_dbg(ndd->dev, "duplicate entry for uuid\n"); + return false; + } + found_uuid = true; + if (!nsl_validate_nlabel(nd_region, ndd, nd_label)) + continue; + if (position != pos) + continue; + found = nd_label; + break; + } + if (found) + break; + } + return found != NULL; +} + +static int select_pmem_id(struct nd_region *nd_region, const uuid_t *pmem_id) +{ + int i; + + if (!pmem_id) + return -ENODEV; + + 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); + struct nd_namespace_label *nd_label = NULL; + u64 hw_start, hw_end, pmem_start, pmem_end; + struct nd_label_ent *label_ent; + + lockdep_assert_held(&nd_mapping->lock); + list_for_each_entry(label_ent, &nd_mapping->labels, list) { + nd_label = label_ent->label; + if (!nd_label) + continue; + if (nsl_uuid_equal(ndd, nd_label, pmem_id)) + break; + nd_label = NULL; + } + + if (!nd_label) { + WARN_ON(1); + return -EINVAL; + } + + /* + * Check that this label is compliant with the dpa + * range published in NFIT + */ + hw_start = nd_mapping->start; + hw_end = hw_start + nd_mapping->size; + pmem_start = nsl_get_dpa(ndd, nd_label); + pmem_end = pmem_start + nsl_get_rawsize(ndd, nd_label); + if (pmem_start >= hw_start && pmem_start < hw_end + && pmem_end <= hw_end && pmem_end > hw_start) + /* pass */; + else { + dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n", + dev_name(ndd->dev), + nsl_uuid_raw(ndd, nd_label)); + return -EINVAL; + } + + /* move recently validated label to the front of the list */ + list_move(&label_ent->list, &nd_mapping->labels); + } + return 0; +} + +/** + * create_namespace_pmem - validate interleave set labelling, retrieve label0 + * @nd_region: region with mappings to validate + * @nspm: target namespace to create + * @nd_label: target pmem namespace label to evaluate + */ +static struct device *create_namespace_pmem(struct nd_region *nd_region, + struct nd_mapping *nd_mapping, + struct nd_namespace_label *nd_label) +{ + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + struct nd_namespace_index *nsindex = + to_namespace_index(ndd, ndd->ns_current); + u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex); + u64 altcookie = nd_region_interleave_set_altcookie(nd_region); + struct nd_label_ent *label_ent; + struct nd_namespace_pmem *nspm; + resource_size_t size = 0; + struct resource *res; + struct device *dev; + uuid_t uuid; + int rc = 0; + u16 i; + + if (cookie == 0) { + dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n"); + return ERR_PTR(-ENXIO); + } + + if (!nsl_validate_isetcookie(ndd, nd_label, cookie)) { + dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n", + nsl_uuid_raw(ndd, nd_label)); + if (!nsl_validate_isetcookie(ndd, nd_label, altcookie)) + return ERR_PTR(-EAGAIN); + + dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n", + nsl_uuid_raw(ndd, nd_label)); + } + + nspm = kzalloc(sizeof(*nspm), GFP_KERNEL); + if (!nspm) + return ERR_PTR(-ENOMEM); + + nspm->id = -1; + dev = &nspm->nsio.common.dev; + dev->type = &namespace_pmem_device_type; + dev->parent = &nd_region->dev; + res = &nspm->nsio.res; + res->name = dev_name(&nd_region->dev); + res->flags = IORESOURCE_MEM; + + for (i = 0; i < nd_region->ndr_mappings; i++) { + nsl_get_uuid(ndd, nd_label, &uuid); + if (has_uuid_at_pos(nd_region, &uuid, cookie, i)) + continue; + if (has_uuid_at_pos(nd_region, &uuid, altcookie, i)) + continue; + break; + } + + if (i < nd_region->ndr_mappings) { + struct nvdimm *nvdimm = nd_region->mapping[i].nvdimm; + + /* + * Give up if we don't find an instance of a uuid at each + * position (from 0 to nd_region->ndr_mappings - 1), or if we + * find a dimm with two instances of the same uuid. + */ + dev_err(&nd_region->dev, "%s missing label for %pUb\n", + nvdimm_name(nvdimm), nsl_uuid_raw(ndd, nd_label)); + rc = -EINVAL; + goto err; + } + + /* + * Fix up each mapping's 'labels' to have the validated pmem label for + * that position at labels[0], and NULL at labels[1]. In the process, + * check that the namespace aligns with interleave-set. + */ + nsl_get_uuid(ndd, nd_label, &uuid); + rc = select_pmem_id(nd_region, &uuid); + if (rc) + goto err; + + /* Calculate total size and populate namespace properties from label0 */ + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct nd_namespace_label *label0; + struct nvdimm_drvdata *ndd; + + nd_mapping = &nd_region->mapping[i]; + label_ent = list_first_entry_or_null(&nd_mapping->labels, + typeof(*label_ent), list); + label0 = label_ent ? label_ent->label : NULL; + + if (!label0) { + WARN_ON(1); + continue; + } + + ndd = to_ndd(nd_mapping); + size += nsl_get_rawsize(ndd, label0); + if (nsl_get_position(ndd, label0) != 0) + continue; + WARN_ON(nspm->alt_name || nspm->uuid); + nspm->alt_name = kmemdup(nsl_ref_name(ndd, label0), + NSLABEL_NAME_LEN, GFP_KERNEL); + nsl_get_uuid(ndd, label0, &uuid); + nspm->uuid = kmemdup(&uuid, sizeof(uuid_t), GFP_KERNEL); + nspm->lbasize = nsl_get_lbasize(ndd, label0); + nspm->nsio.common.claim_class = + nsl_get_claim_class(ndd, label0); + } + + if (!nspm->alt_name || !nspm->uuid) { + rc = -ENOMEM; + goto err; + } + + nd_namespace_pmem_set_resource(nd_region, nspm, size); + + return dev; + err: + namespace_pmem_release(dev); + switch (rc) { + case -EINVAL: + dev_dbg(&nd_region->dev, "invalid label(s)\n"); + break; + case -ENODEV: + dev_dbg(&nd_region->dev, "label not found\n"); + break; + default: + dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc); + break; + } + return ERR_PTR(rc); +} + +static struct device *nd_namespace_pmem_create(struct nd_region *nd_region) +{ + struct nd_namespace_pmem *nspm; + struct resource *res; + struct device *dev; + + if (!is_memory(&nd_region->dev)) + return NULL; + + nspm = kzalloc(sizeof(*nspm), GFP_KERNEL); + if (!nspm) + return NULL; + + dev = &nspm->nsio.common.dev; + dev->type = &namespace_pmem_device_type; + dev->parent = &nd_region->dev; + res = &nspm->nsio.res; + res->name = dev_name(&nd_region->dev); + res->flags = IORESOURCE_MEM; + + nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL); + if (nspm->id < 0) { + kfree(nspm); + return NULL; + } + dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id); + nd_namespace_pmem_set_resource(nd_region, nspm, 0); + + return dev; +} + +static struct lock_class_key nvdimm_namespace_key; + +void nd_region_create_ns_seed(struct nd_region *nd_region) +{ + WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); + + if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO) + return; + + nd_region->ns_seed = nd_namespace_pmem_create(nd_region); + + /* + * Seed creation failures are not fatal, provisioning is simply + * disabled until memory becomes available + */ + if (!nd_region->ns_seed) + dev_err(&nd_region->dev, "failed to create namespace\n"); + else { + device_initialize(nd_region->ns_seed); + lockdep_set_class(&nd_region->ns_seed->mutex, + &nvdimm_namespace_key); + nd_device_register(nd_region->ns_seed); + } +} + +void nd_region_create_dax_seed(struct nd_region *nd_region) +{ + WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); + nd_region->dax_seed = nd_dax_create(nd_region); + /* + * Seed creation failures are not fatal, provisioning is simply + * disabled until memory becomes available + */ + if (!nd_region->dax_seed) + dev_err(&nd_region->dev, "failed to create dax namespace\n"); +} + +void nd_region_create_pfn_seed(struct nd_region *nd_region) +{ + WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); + nd_region->pfn_seed = nd_pfn_create(nd_region); + /* + * Seed creation failures are not fatal, provisioning is simply + * disabled until memory becomes available + */ + if (!nd_region->pfn_seed) + dev_err(&nd_region->dev, "failed to create pfn namespace\n"); +} + +void nd_region_create_btt_seed(struct nd_region *nd_region) +{ + WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); + nd_region->btt_seed = nd_btt_create(nd_region); + /* + * Seed creation failures are not fatal, provisioning is simply + * disabled until memory becomes available + */ + if (!nd_region->btt_seed) + dev_err(&nd_region->dev, "failed to create btt namespace\n"); +} + +static int add_namespace_resource(struct nd_region *nd_region, + struct nd_namespace_label *nd_label, struct device **devs, + int count) +{ + struct nd_mapping *nd_mapping = &nd_region->mapping[0]; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + int i; + + for (i = 0; i < count; i++) { + uuid_t *uuid = namespace_to_uuid(devs[i]); + + if (IS_ERR(uuid)) { + WARN_ON(1); + continue; + } + + if (!nsl_uuid_equal(ndd, nd_label, uuid)) + continue; + dev_err(&nd_region->dev, + "error: conflicting extents for uuid: %pUb\n", uuid); + return -ENXIO; + } + + return i; +} + +static int cmp_dpa(const void *a, const void *b) +{ + const struct device *dev_a = *(const struct device **) a; + const struct device *dev_b = *(const struct device **) b; + struct nd_namespace_pmem *nspm_a, *nspm_b; + + if (is_namespace_io(dev_a)) + return 0; + + nspm_a = to_nd_namespace_pmem(dev_a); + nspm_b = to_nd_namespace_pmem(dev_b); + + return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start, + sizeof(resource_size_t)); +} + +static struct device **scan_labels(struct nd_region *nd_region) +{ + int i, count = 0; + struct device *dev, **devs = NULL; + struct nd_label_ent *label_ent, *e; + struct nd_mapping *nd_mapping = &nd_region->mapping[0]; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1; + + /* "safe" because create_namespace_pmem() might list_move() label_ent */ + list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) { + struct nd_namespace_label *nd_label = label_ent->label; + struct device **__devs; + + if (!nd_label) + continue; + + /* skip labels that describe extents outside of the region */ + if (nsl_get_dpa(ndd, nd_label) < nd_mapping->start || + nsl_get_dpa(ndd, nd_label) > map_end) + continue; + + i = add_namespace_resource(nd_region, nd_label, devs, count); + if (i < 0) + goto err; + if (i < count) + continue; + __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL); + if (!__devs) + goto err; + memcpy(__devs, devs, sizeof(dev) * count); + kfree(devs); + devs = __devs; + + dev = create_namespace_pmem(nd_region, nd_mapping, nd_label); + if (IS_ERR(dev)) { + switch (PTR_ERR(dev)) { + case -EAGAIN: + /* skip invalid labels */ + continue; + case -ENODEV: + /* fallthrough to seed creation */ + break; + default: + goto err; + } + } else + devs[count++] = dev; + + } + + dev_dbg(&nd_region->dev, "discovered %d namespace%s\n", count, + count == 1 ? "" : "s"); + + if (count == 0) { + struct nd_namespace_pmem *nspm; + + /* Publish a zero-sized namespace for userspace to configure. */ + nd_mapping_free_labels(nd_mapping); + + devs = kcalloc(2, sizeof(dev), GFP_KERNEL); + if (!devs) + goto err; + + nspm = kzalloc(sizeof(*nspm), GFP_KERNEL); + if (!nspm) + goto err; + dev = &nspm->nsio.common.dev; + dev->type = &namespace_pmem_device_type; + nd_namespace_pmem_set_resource(nd_region, nspm, 0); + dev->parent = &nd_region->dev; + devs[count++] = dev; + } else if (is_memory(&nd_region->dev)) { + /* clean unselected labels */ + for (i = 0; i < nd_region->ndr_mappings; i++) { + struct list_head *l, *e; + LIST_HEAD(list); + int j; + + nd_mapping = &nd_region->mapping[i]; + if (list_empty(&nd_mapping->labels)) { + WARN_ON(1); + continue; + } + + j = count; + list_for_each_safe(l, e, &nd_mapping->labels) { + if (!j--) + break; + list_move_tail(l, &list); + } + nd_mapping_free_labels(nd_mapping); + list_splice_init(&list, &nd_mapping->labels); + } + } + + if (count > 1) + sort(devs, count, sizeof(struct device *), cmp_dpa, NULL); + + return devs; + + err: + if (devs) { + for (i = 0; devs[i]; i++) + namespace_pmem_release(devs[i]); + kfree(devs); + } + return NULL; +} + +static struct device **create_namespaces(struct nd_region *nd_region) +{ + struct nd_mapping *nd_mapping; + struct device **devs; + int i; + + if (nd_region->ndr_mappings == 0) + return NULL; + + /* lock down all mappings while we scan labels */ + for (i = 0; i < nd_region->ndr_mappings; i++) { + nd_mapping = &nd_region->mapping[i]; + mutex_lock_nested(&nd_mapping->lock, i); + } + + devs = scan_labels(nd_region); + + for (i = 0; i < nd_region->ndr_mappings; i++) { + int reverse = nd_region->ndr_mappings - 1 - i; + + nd_mapping = &nd_region->mapping[reverse]; + mutex_unlock(&nd_mapping->lock); + } + + return devs; +} + +static void deactivate_labels(void *region) +{ + struct nd_region *nd_region = region; + int i; + + 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; + + mutex_lock(&nd_mapping->lock); + nd_mapping_free_labels(nd_mapping); + mutex_unlock(&nd_mapping->lock); + + put_ndd(ndd); + nd_mapping->ndd = NULL; + if (ndd) + atomic_dec(&nvdimm->busy); + } +} + +static int init_active_labels(struct nd_region *nd_region) +{ + int i, rc = 0; + + 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); + struct nvdimm *nvdimm = nd_mapping->nvdimm; + struct nd_label_ent *label_ent; + int count, j; + + /* + * If the dimm is disabled then we may need to prevent + * the region from being activated. + */ + if (!ndd) { + if (test_bit(NDD_LOCKED, &nvdimm->flags)) + /* fail, label data may be unreadable */; + else if (test_bit(NDD_LABELING, &nvdimm->flags)) + /* fail, labels needed to disambiguate dpa */; + else + continue; + + dev_err(&nd_region->dev, "%s: is %s, failing probe\n", + dev_name(&nd_mapping->nvdimm->dev), + test_bit(NDD_LOCKED, &nvdimm->flags) + ? "locked" : "disabled"); + rc = -ENXIO; + goto out; + } + nd_mapping->ndd = ndd; + atomic_inc(&nvdimm->busy); + get_ndd(ndd); + + count = nd_label_active_count(ndd); + dev_dbg(ndd->dev, "count: %d\n", count); + if (!count) + continue; + for (j = 0; j < count; j++) { + struct nd_namespace_label *label; + + label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL); + if (!label_ent) + break; + label = nd_label_active(ndd, j); + label_ent->label = label; + + mutex_lock(&nd_mapping->lock); + list_add_tail(&label_ent->list, &nd_mapping->labels); + mutex_unlock(&nd_mapping->lock); + } + + if (j < count) + break; + } + + if (i < nd_region->ndr_mappings) + rc = -ENOMEM; + +out: + if (rc) { + deactivate_labels(nd_region); + return rc; + } + + return devm_add_action_or_reset(&nd_region->dev, deactivate_labels, + nd_region); +} + +int nd_region_register_namespaces(struct nd_region *nd_region, int *err) +{ + struct device **devs = NULL; + int i, rc = 0, type; + + *err = 0; + nvdimm_bus_lock(&nd_region->dev); + rc = init_active_labels(nd_region); + if (rc) { + nvdimm_bus_unlock(&nd_region->dev); + return rc; + } + + type = nd_region_to_nstype(nd_region); + switch (type) { + case ND_DEVICE_NAMESPACE_IO: + devs = create_namespace_io(nd_region); + break; + case ND_DEVICE_NAMESPACE_PMEM: + devs = create_namespaces(nd_region); + break; + default: + break; + } + nvdimm_bus_unlock(&nd_region->dev); + + if (!devs) + return -ENODEV; + + for (i = 0; devs[i]; i++) { + struct device *dev = devs[i]; + int id; + + if (type == ND_DEVICE_NAMESPACE_PMEM) { + struct nd_namespace_pmem *nspm; + + nspm = to_nd_namespace_pmem(dev); + id = ida_simple_get(&nd_region->ns_ida, 0, 0, + GFP_KERNEL); + nspm->id = id; + } else + id = i; + + if (id < 0) + break; + dev_set_name(dev, "namespace%d.%d", nd_region->id, id); + device_initialize(dev); + lockdep_set_class(&dev->mutex, &nvdimm_namespace_key); + nd_device_register(dev); + } + if (i) + nd_region->ns_seed = devs[0]; + + if (devs[i]) { + int j; + + for (j = i; devs[j]; j++) { + struct device *dev = devs[j]; + + device_initialize(dev); + put_device(dev); + } + *err = j - i; + /* + * All of the namespaces we tried to register failed, so + * fail region activation. + */ + if (*err == 0) + rc = -ENODEV; + } + kfree(devs); + + if (rc == -ENODEV) + return rc; + + return i; +} |