| /* |
| * 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/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 "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 void namespace_blk_release(struct device *dev) |
| { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| struct nd_region *nd_region = to_nd_region(dev->parent); |
| |
| if (nsblk->id >= 0) |
| ida_simple_remove(&nd_region->ns_ida, nsblk->id); |
| kfree(nsblk->alt_name); |
| kfree(nsblk->uuid); |
| kfree(nsblk->res); |
| kfree(nsblk); |
| } |
| |
| static const struct device_type namespace_io_device_type = { |
| .name = "nd_namespace_io", |
| .release = namespace_io_release, |
| }; |
| |
| static const struct device_type namespace_pmem_device_type = { |
| .name = "nd_namespace_pmem", |
| .release = namespace_pmem_release, |
| }; |
| |
| static const struct device_type namespace_blk_device_type = { |
| .name = "nd_namespace_blk", |
| .release = namespace_blk_release, |
| }; |
| |
| static bool is_namespace_pmem(const struct device *dev) |
| { |
| return dev ? dev->type == &namespace_pmem_device_type : false; |
| } |
| |
| static bool is_namespace_blk(const struct device *dev) |
| { |
| return dev ? dev->type == &namespace_blk_device_type : false; |
| } |
| |
| static bool is_namespace_io(const struct device *dev) |
| { |
| return dev ? dev->type == &namespace_io_device_type : false; |
| } |
| |
| static int is_uuid_busy(struct device *dev, void *data) |
| { |
| u8 *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_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| uuid2 = nsblk->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 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0) |
| 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, u8 *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 if (is_namespace_blk(&ndns->dev)) { |
| struct nd_namespace_blk *nsblk; |
| |
| nsblk = to_nd_namespace_blk(&ndns->dev); |
| sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id, |
| suffix ? suffix : ""); |
| } else { |
| return NULL; |
| } |
| |
| return name; |
| } |
| EXPORT_SYMBOL(nvdimm_namespace_disk_name); |
| |
| const u8 *nd_dev_to_uuid(struct device *dev) |
| { |
| static const u8 null_uuid[16]; |
| |
| if (!dev) |
| return null_uuid; |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| return nspm->uuid; |
| } else if (is_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| return nsblk->uuid; |
| } else |
| return null_uuid; |
| } |
| 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 if (is_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| ns_altname = &nsblk->alt_name; |
| } else |
| return -ENXIO; |
| |
| if (dev->driver || to_ndns(dev)->claim) |
| return -EBUSY; |
| |
| input = kmemdup(buf, len + 1, GFP_KERNEL); |
| if (!input) |
| return -ENOMEM; |
| |
| input[len] = '\0'; |
| 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 resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk) |
| { |
| struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent); |
| struct nd_mapping *nd_mapping = &nd_region->mapping[0]; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| struct nd_label_id label_id; |
| resource_size_t size = 0; |
| struct resource *res; |
| |
| if (!nsblk->uuid) |
| return 0; |
| nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL); |
| for_each_dpa_resource(ndd, res) |
| if (strcmp(res->name, label_id.id) == 0) |
| size += resource_size(res); |
| return size; |
| } |
| |
| static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk) |
| { |
| struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent); |
| 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; |
| int count, i; |
| |
| if (!nsblk->uuid || !nsblk->lbasize || !ndd) |
| return false; |
| |
| count = 0; |
| nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL); |
| for_each_dpa_resource(ndd, res) { |
| if (strcmp(res->name, label_id.id) != 0) |
| continue; |
| /* |
| * Resources with unacknowledged adjustments indicate a |
| * failure to update labels |
| */ |
| if (res->flags & DPA_RESOURCE_ADJUSTED) |
| return false; |
| count++; |
| } |
| |
| /* These values match after a successful label update */ |
| if (count != nsblk->num_resources) |
| return false; |
| |
| for (i = 0; i < nsblk->num_resources; i++) { |
| struct resource *found = NULL; |
| |
| for_each_dpa_resource(ndd, res) |
| if (res == nsblk->res[i]) { |
| found = res; |
| break; |
| } |
| /* stale resource */ |
| if (!found) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk) |
| { |
| resource_size_t size; |
| |
| nvdimm_bus_lock(&nsblk->common.dev); |
| size = __nd_namespace_blk_validate(nsblk); |
| nvdimm_bus_unlock(&nsblk->common.dev); |
| |
| return size; |
| } |
| EXPORT_SYMBOL(nd_namespace_blk_validate); |
| |
| |
| 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 if (is_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| resource_size_t size = nd_namespace_blk_size(nsblk); |
| |
| if (size == 0 && nsblk->uuid) |
| /* delete allocation */; |
| else if (!nsblk->uuid || !nsblk->lbasize) |
| return 0; |
| |
| return nd_blk_namespace_label_update(nd_region, nsblk, 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: %s(%zd)\n", __func__, 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 if (is_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| ns_altname = nsblk->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) |
| { |
| bool is_blk = strncmp(label_id->id, "blk", 3) == 0; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| int rc = 0; |
| |
| while (n) { |
| struct resource *res, *last; |
| resource_size_t new_start; |
| |
| 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; |
| } |
| |
| /* |
| * Keep BLK allocations relegated to high DPA as much as |
| * possible |
| */ |
| if (is_blk) |
| new_start = res->start + n; |
| else |
| new_start = res->start; |
| |
| rc = adjust_resource(res, new_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) |
| { |
| bool is_blk = strncmp(label_id->id, "blk", 3) == 0; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| resource_size_t first_dpa; |
| struct resource *res; |
| int rc = 0; |
| |
| /* allocate blk from highest dpa first */ |
| if (is_blk) |
| first_dpa = nd_mapping->start + nd_mapping->size - n; |
| else |
| first_dpa = nd_mapping->start; |
| |
| /* first resource allocation for this label-id or dimm */ |
| res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, 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 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; |
| bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0; |
| |
| if (valid->start >= valid->end) |
| goto invalid; |
| |
| if (is_reserve) |
| return; |
| |
| if (!is_pmem) { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[0]; |
| struct nvdimm_bus *nvdimm_bus; |
| struct blk_alloc_info info = { |
| .nd_mapping = nd_mapping, |
| .available = nd_mapping->size, |
| .res = valid, |
| }; |
| |
| WARN_ON(!is_nd_blk(&nd_region->dev)); |
| nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); |
| device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy); |
| 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; |
| bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0; |
| 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) { |
| /* BLK allocate bottom up */ |
| if (!is_pmem) |
| valid.start += available - allocate; |
| |
| 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 we allocated nothing in the BLK case it may be because we are in |
| * an initial "pmem-reserve pass". Only do an initial BLK allocation |
| * when none of the DPA space is reserved. |
| */ |
| if ((is_pmem || !ndd->dpa.child) && 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; |
| } |
| |
| static 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, &rem); |
| 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; |
| } |
| |
| static 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); |
| } |
| |
| static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus, |
| struct nd_mapping *nd_mapping) |
| { |
| struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| int rc; |
| |
| rc = device_for_each_child(&nvdimm_bus->dev, nvdimm, |
| __reserve_free_pmem); |
| if (rc) |
| release_free_pmem(nvdimm_bus, nd_mapping); |
| return rc; |
| } |
| |
| /** |
| * 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) |
| { |
| struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); |
| bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0; |
| 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, j; |
| |
| /* |
| * In the BLK case try once with all unallocated PMEM |
| * reserved, and once without |
| */ |
| for (j = is_pmem; j < 2; j++) { |
| bool blk_only = j == 0; |
| |
| if (blk_only) { |
| rc = reserve_free_pmem(nvdimm_bus, nd_mapping); |
| if (rc) |
| return rc; |
| } |
| rem = scan_allocate(nd_region, nd_mapping, |
| label_id, rem); |
| if (blk_only) |
| release_free_pmem(nvdimm_bus, nd_mapping); |
| |
| /* try again and allow encroachments into PMEM */ |
| if (rem == 0) |
| break; |
| } |
| |
| 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 u8 *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; |
| u8 *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; |
| } else if (is_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| uuid = nsblk->uuid; |
| flags = NSLABEL_FLAG_LOCAL; |
| id = nsblk->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, "%s: not associated with dimm(s)\n", __func__); |
| return -ENXIO; |
| } |
| |
| div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder); |
| if (remainder) { |
| dev_dbg(dev, "%llu is not %dK aligned\n", val, |
| (SZ_4K * nd_region->ndr_mappings) / 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, or the base dimm for a blk |
| * region, need to be enabled for the size to be changed. |
| */ |
| if (!ndd) |
| return -ENXIO; |
| |
| allocated += nvdimm_allocated_dpa(ndd, &label_id); |
| } |
| available = nd_region_available_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; |
| u8 **uuid = NULL; |
| 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); |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| uuid = &nspm->uuid; |
| } else if (is_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| uuid = &nsblk->uuid; |
| } |
| |
| if (rc == 0 && val == 0 && uuid) { |
| /* setting size zero == 'delete namespace' */ |
| kfree(*uuid); |
| *uuid = NULL; |
| } |
| |
| dev_dbg(dev, "%s: %llx %s (%d)\n", __func__, 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_blk(dev)) { |
| return nd_namespace_blk_size(to_nd_namespace_blk(dev)); |
| } 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); |
| |
| 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 u8 *namespace_to_uuid(struct device *dev) |
| { |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| return nspm->uuid; |
| } else if (is_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| return nsblk->uuid; |
| } else |
| return ERR_PTR(-ENXIO); |
| } |
| |
| static ssize_t uuid_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| u8 *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, u8 *new_uuid, u8 **old_uuid) |
| { |
| u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0; |
| 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, flags); |
| nd_label_gen_id(&new_label_id, new_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 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; |
| |
| if (!nd_label) |
| continue; |
| nd_label_gen_id(&label_id, nd_label->uuid, |
| __le32_to_cpu(nd_label->flags)); |
| 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); |
| u8 *uuid = NULL; |
| ssize_t rc = 0; |
| u8 **ns_uuid; |
| |
| if (is_namespace_pmem(dev)) { |
| struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); |
| |
| ns_uuid = &nspm->uuid; |
| } else if (is_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| ns_uuid = &nsblk->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, "%s: result: %zd wrote: %s%s", __func__, |
| 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_RO(resource); |
| |
| static const unsigned long blk_lbasize_supported[] = { 512, 520, 528, |
| 4096, 4104, 4160, 4224, 0 }; |
| |
| 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_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| return nd_size_select_show(nsblk->lbasize, |
| blk_lbasize_supported, 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_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| lbasize = &nsblk->lbasize; |
| supported = blk_lbasize_supported; |
| } else 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, "%s: result: %zd %s: %s%s", __func__, |
| 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; |
| int count = 0, i; |
| u8 *uuid = NULL; |
| 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; |
| } else if (is_namespace_blk(dev)) { |
| struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
| |
| uuid = nsblk->uuid; |
| flags = NSLABEL_FLAG_LOCAL; |
| } |
| |
| 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 ssize_t __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 (strcmp(buf, "btt") == 0 || strcmp(buf, "btt\n") == 0) |
| ndns->claim_class = btt_claim_class(dev); |
| else if (strcmp(buf, "pfn") == 0 || strcmp(buf, "pfn\n") == 0) |
| ndns->claim_class = NVDIMM_CCLASS_PFN; |
| else if (strcmp(buf, "dax") == 0 || strcmp(buf, "dax\n") == 0) |
| ndns->claim_class = NVDIMM_CCLASS_DAX; |
| else if (strcmp(buf, "") == 0 || strcmp(buf, "\n") == 0) |
| ndns->claim_class = NVDIMM_CCLASS_NONE; |
| else |
| return -EINVAL; |
| |
| /* btt_claim_class() could've returned an error */ |
| if (ndns->claim_class < 0) |
| return ndns->claim_class; |
| |
| 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); |
| ssize_t 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: %s(%zd)\n", __func__, 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 (a == &dev_attr_resource.attr) { |
| if (is_namespace_blk(dev)) |
| return 0; |
| return 0400; |
| } |
| |
| if (is_namespace_pmem(dev) || is_namespace_blk(dev)) { |
| if (a == &dev_attr_size.attr) |
| return 0644; |
| |
| return a->mode; |
| } |
| |
| 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) |
| 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, |
| }; |
| |
| 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); |
| } |
| } |
| |
| 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); |
| } |
| |
| 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); |
| } else if (is_namespace_blk(&ndns->dev)) { |
| struct nd_namespace_blk *nsblk; |
| |
| nsblk = to_nd_namespace_blk(&ndns->dev); |
| if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__)) |
| return ERR_PTR(-ENODEV); |
| if (!nsblk->lbasize) { |
| dev_dbg(&ndns->dev, "%s: sector size not set\n", |
| __func__); |
| return ERR_PTR(-ENODEV); |
| } |
| if (!nd_namespace_blk_validate(nsblk)) |
| return ERR_PTR(-ENODEV); |
| } |
| |
| return ndns; |
| } |
| EXPORT_SYMBOL(nvdimm_namespace_common_probe); |
| |
| 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, u8 *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, nlabel; |
| u64 isetcookie; |
| |
| if (!nd_label) |
| continue; |
| isetcookie = __le64_to_cpu(nd_label->isetcookie); |
| position = __le16_to_cpu(nd_label->position); |
| nlabel = __le16_to_cpu(nd_label->nlabel); |
| |
| if (isetcookie != cookie) |
| continue; |
| |
| if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0) |
| continue; |
| |
| if (namespace_label_has(ndd, type_guid) |
| && !guid_equal(&nd_set->type_guid, |
| &nd_label->type_guid)) { |
| dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n", |
| nd_set->type_guid.b, |
| nd_label->type_guid.b); |
| continue; |
| } |
| |
| if (found_uuid) { |
| dev_dbg(ndd->dev, |
| "%s duplicate entry for uuid\n", |
| __func__); |
| return false; |
| } |
| found_uuid = true; |
| if (nlabel != nd_region->ndr_mappings) |
| 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, u8 *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 (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0) |
| 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 = __le64_to_cpu(nd_label->dpa); |
| pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize); |
| 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), nd_label->uuid); |
| 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 |
| */ |
| struct device *create_namespace_pmem(struct nd_region *nd_region, |
| struct nd_namespace_index *nsindex, |
| struct nd_namespace_label *nd_label) |
| { |
| 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; |
| struct nd_mapping *nd_mapping; |
| resource_size_t size = 0; |
| struct resource *res; |
| struct device *dev; |
| int rc = 0; |
| u16 i; |
| |
| if (cookie == 0) { |
| dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n"); |
| return ERR_PTR(-ENXIO); |
| } |
| |
| if (__le64_to_cpu(nd_label->isetcookie) != cookie) { |
| dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n", |
| nd_label->uuid); |
| if (__le64_to_cpu(nd_label->isetcookie) != altcookie) |
| return ERR_PTR(-EAGAIN); |
| |
| dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n", |
| nd_label->uuid); |
| } |
| |
| 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++) { |
| if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i)) |
| continue; |
| if (has_uuid_at_pos(nd_region, nd_label->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), nd_label->uuid); |
| 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. We know |
| * that it does not overlap with any blk namespaces by virtue of |
| * the dimm being enabled (i.e. nd_label_reserve_dpa() |
| * succeeded). |
| */ |
| rc = select_pmem_id(nd_region, nd_label->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 : 0; |
| |
| if (!label0) { |
| WARN_ON(1); |
| continue; |
| } |
| |
| size += __le64_to_cpu(label0->rawsize); |
| if (__le16_to_cpu(label0->position) != 0) |
| continue; |
| WARN_ON(nspm->alt_name || nspm->uuid); |
| nspm->alt_name = kmemdup((void __force *) label0->name, |
| NSLABEL_NAME_LEN, GFP_KERNEL); |
| nspm->uuid = kmemdup((void __force *) label0->uuid, |
| NSLABEL_UUID_LEN, GFP_KERNEL); |
| nspm->lbasize = __le64_to_cpu(label0->lbasize); |
| ndd = to_ndd(nd_mapping); |
| if (namespace_label_has(ndd, abstraction_guid)) |
| nspm->nsio.common.claim_class |
| = to_nvdimm_cclass(&label0->abstraction_guid); |
| |
| } |
| |
| 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, "%s: invalid label(s)\n", __func__); |
| break; |
| case -ENODEV: |
| dev_dbg(&nd_region->dev, "%s: label not found\n", __func__); |
| break; |
| default: |
| dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n", |
| __func__, rc); |
| break; |
| } |
| return ERR_PTR(rc); |
| } |
| |
| struct resource *nsblk_add_resource(struct nd_region *nd_region, |
| struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk, |
| resource_size_t start) |
| { |
| struct nd_label_id label_id; |
| struct resource *res; |
| |
| nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL); |
| res = krealloc(nsblk->res, |
| sizeof(void *) * (nsblk->num_resources + 1), |
| GFP_KERNEL); |
| if (!res) |
| return NULL; |
| nsblk->res = (struct resource **) res; |
| for_each_dpa_resource(ndd, res) |
| if (strcmp(res->name, label_id.id) == 0 |
| && res->start == start) { |
| nsblk->res[nsblk->num_resources++] = res; |
| return res; |
| } |
| return NULL; |
| } |
| |
| static struct device *nd_namespace_blk_create(struct nd_region *nd_region) |
| { |
| struct nd_namespace_blk *nsblk; |
| struct device *dev; |
| |
| if (!is_nd_blk(&nd_region->dev)) |
| return NULL; |
| |
| nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL); |
| if (!nsblk) |
| return NULL; |
| |
| dev = &nsblk->common.dev; |
| dev->type = &namespace_blk_device_type; |
| nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL); |
| if (nsblk->id < 0) { |
| kfree(nsblk); |
| return NULL; |
| } |
| dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id); |
| dev->parent = &nd_region->dev; |
| dev->groups = nd_namespace_attribute_groups; |
| |
| return &nsblk->common.dev; |
| } |
| |
| 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); |
| dev->parent = &nd_region->dev; |
| dev->groups = nd_namespace_attribute_groups; |
| nd_namespace_pmem_set_resource(nd_region, nspm, 0); |
| |
| return dev; |
| } |
| |
| 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; |
| |
| if (is_nd_blk(&nd_region->dev)) |
| nd_region->ns_seed = nd_namespace_blk_create(nd_region); |
| else |
| 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 %s namespace\n", |
| is_nd_blk(&nd_region->dev) ? "blk" : "pmem"); |
| else |
| 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++) { |
| u8 *uuid = namespace_to_uuid(devs[i]); |
| struct resource *res; |
| |
| if (IS_ERR_OR_NULL(uuid)) { |
| WARN_ON(1); |
| continue; |
| } |
| |
| if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0) |
| continue; |
| if (is_namespace_blk(devs[i])) { |
| res = nsblk_add_resource(nd_region, ndd, |
| to_nd_namespace_blk(devs[i]), |
| __le64_to_cpu(nd_label->dpa)); |
| if (!res) |
| return -ENXIO; |
| nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count); |
| } else { |
| dev_err(&nd_region->dev, |
| "error: conflicting extents for uuid: %pUb\n", |
| nd_label->uuid); |
| return -ENXIO; |
| } |
| break; |
| } |
| |
| return i; |
| } |
| |
| struct device *create_namespace_blk(struct nd_region *nd_region, |
| struct nd_namespace_label *nd_label, int count) |
| { |
| |
| struct nd_mapping *nd_mapping = &nd_region->mapping[0]; |
| struct nd_interleave_set *nd_set = nd_region->nd_set; |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| struct nd_namespace_blk *nsblk; |
| char name[NSLABEL_NAME_LEN]; |
| struct device *dev = NULL; |
| struct resource *res; |
| |
| if (namespace_label_has(ndd, type_guid)) { |
| if (!guid_equal(&nd_set->type_guid, &nd_label->type_guid)) { |
| dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n", |
| nd_set->type_guid.b, |
| nd_label->type_guid.b); |
| return ERR_PTR(-EAGAIN); |
| } |
| |
| if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) { |
| dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n", |
| nd_set->cookie2, |
| __le64_to_cpu(nd_label->isetcookie)); |
| return ERR_PTR(-EAGAIN); |
| } |
| } |
| |
| nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL); |
| if (!nsblk) |
| return ERR_PTR(-ENOMEM); |
| dev = &nsblk->common.dev; |
| dev->type = &namespace_blk_device_type; |
| dev->parent = &nd_region->dev; |
| nsblk->id = -1; |
| nsblk->lbasize = __le64_to_cpu(nd_label->lbasize); |
| nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN, |
| GFP_KERNEL); |
| if (namespace_label_has(ndd, abstraction_guid)) |
| nsblk->common.claim_class |
| = to_nvdimm_cclass(&nd_label->abstraction_guid); |
| if (!nsblk->uuid) |
| goto blk_err; |
| memcpy(name, nd_label->name, NSLABEL_NAME_LEN); |
| if (name[0]) { |
| nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN, |
| GFP_KERNEL); |
| if (!nsblk->alt_name) |
| goto blk_err; |
| } |
| res = nsblk_add_resource(nd_region, ndd, nsblk, |
| __le64_to_cpu(nd_label->dpa)); |
| if (!res) |
| goto blk_err; |
| nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count); |
| return dev; |
| blk_err: |
| namespace_blk_release(dev); |
| return ERR_PTR(-ENXIO); |
| } |
| |
| 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_blk *nsblk_a, *nsblk_b; |
| struct nd_namespace_pmem *nspm_a, *nspm_b; |
| |
| if (is_namespace_io(dev_a)) |
| return 0; |
| |
| if (is_namespace_blk(dev_a)) { |
| nsblk_a = to_nd_namespace_blk(dev_a); |
| nsblk_b = to_nd_namespace_blk(dev_b); |
| |
| return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start, |
| sizeof(resource_size_t)); |
| } |
| |
| 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]; |
| 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; |
| u32 flags; |
| |
| if (!nd_label) |
| continue; |
| flags = __le32_to_cpu(nd_label->flags); |
| if (is_nd_blk(&nd_region->dev) |
| == !!(flags & NSLABEL_FLAG_LOCAL)) |
| /* pass, region matches label type */; |
| else |
| continue; |
| |
| /* skip labels that describe extents outside of the region */ |
| if (nd_label->dpa < nd_mapping->start || nd_label->dpa > 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; |
| |
| if (is_nd_blk(&nd_region->dev)) |
| dev = create_namespace_blk(nd_region, nd_label, count); |
| else { |
| struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
| struct nd_namespace_index *nsindex; |
| |
| nsindex = to_namespace_index(ndd, ndd->ns_current); |
| dev = create_namespace_pmem(nd_region, nsindex, 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, "%s: discovered %d %s namespace%s\n", |
| __func__, count, is_nd_blk(&nd_region->dev) |
| ? "blk" : "pmem", count == 1 ? "" : "s"); |
| |
| if (count == 0) { |
| /* 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; |
| if (is_nd_blk(&nd_region->dev)) { |
| struct nd_namespace_blk *nsblk; |
| |
| nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL); |
| if (!nsblk) |
| goto err; |
| dev = &nsblk->common.dev; |
| dev->type = &namespace_blk_device_type; |
| } else { |
| struct nd_namespace_pmem *nspm; |
| |
| 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++) |
| if (is_nd_blk(&nd_region->dev)) |
| namespace_blk_release(devs[i]); |
| else |
| namespace_pmem_release(devs[i]); |
| kfree(devs); |
| } |
| return NULL; |
| } |
| |
| static struct device **create_namespaces(struct nd_region *nd_region) |
| { |
| struct nd_mapping *nd_mapping = &nd_region->mapping[0]; |
| 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 int init_active_labels(struct nd_region *nd_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 = 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_ALIASING, &nvdimm->flags)) |
| /* fail, labels needed to disambiguate dpa */; |
| else |
| return 0; |
| |
| 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"); |
| return -ENXIO; |
| } |
| nd_mapping->ndd = ndd; |
| atomic_inc(&nvdimm->busy); |
| get_ndd(ndd); |
| |
| count = nd_label_active_count(ndd); |
| dev_dbg(ndd->dev, "%s: %d\n", __func__, 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) |
| continue; |
| |
| mutex_lock(&nd_mapping->lock); |
| nd_mapping_free_labels(nd_mapping); |
| mutex_unlock(&nd_mapping->lock); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| 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: |
| case ND_DEVICE_NAMESPACE_BLK: |
| 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_BLK) { |
| struct nd_namespace_blk *nsblk; |
| |
| nsblk = to_nd_namespace_blk(dev); |
| id = ida_simple_get(&nd_region->ns_ida, 0, 0, |
| GFP_KERNEL); |
| nsblk->id = id; |
| } else 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); |
| dev->groups = nd_namespace_attribute_groups; |
| 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; |
| } |