diff options
Diffstat (limited to 'drivers/nvdimm/namespace_devs.c')
| -rw-r--r-- | drivers/nvdimm/namespace_devs.c | 1870 |
1 files changed, 1870 insertions, 0 deletions
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c new file mode 100644 index 000000000000..fef0dd80d4ad --- /dev/null +++ b/drivers/nvdimm/namespace_devs.c @@ -0,0 +1,1870 @@ +/* + * 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/slab.h> +#include <linux/nd.h> +#include "nd-core.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); + + 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 struct device_type namespace_io_device_type = { + .name = "nd_namespace_io", + .release = namespace_io_release, +}; + +static struct device_type namespace_pmem_device_type = { + .name = "nd_namespace_pmem", + .release = namespace_pmem_release, +}; + +static struct device_type namespace_blk_device_type = { + .name = "nd_namespace_blk", + .release = namespace_blk_release, +}; + +static bool is_namespace_pmem(struct device *dev) +{ + return dev ? dev->type == &namespace_pmem_device_type : false; +} + +static bool is_namespace_blk(struct device *dev) +{ + return dev ? dev->type == &namespace_blk_device_type : false; +} + +static bool is_namespace_io(struct device *dev) +{ + return dev ? dev->type == &namespace_io_device_type : false; +} + +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 = ""; + + if (ndns->claim && is_nd_btt(ndns->claim)) + suffix = "s"; + + if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) + sprintf(name, "pmem%d%s", nd_region->id, 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); + } else { + return NULL; + } + + return name; +} +EXPORT_SYMBOL(nvdimm_namespace_disk_name); + +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 unacknoweldged 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; +} + +static bool space_valid(bool is_pmem, bool is_reserve, + struct nd_label_id *label_id, struct resource *res) +{ + /* + * For BLK-space any space is valid, for PMEM-space, it must be + * contiguous with an existing allocation unless we are + * reserving pmem. + */ + if (is_reserve || !is_pmem) + return true; + if (!res || strcmp(res->name, label_id->id) == 0) + return true; + return false; +} + +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_reserve = strcmp(label_id->id, "pmem-reserve") == 0; + bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0; + struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); + const resource_size_t to_allocate = n; + struct resource *res; + int first; + + retry: + first = 0; + for_each_dpa_resource(ndd, res) { + resource_size_t allocate, available = 0, free_start, free_end; + struct resource *next = res->sibling, *new_res = NULL; + 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) { + free_start = nd_mapping->start; + available = res->start - free_start; + if (space_valid(is_pmem, is_reserve, label_id, NULL)) + loc = ALLOC_BEFORE; + } + + /* space between allocations */ + if (!loc && next) { + free_start = res->start + resource_size(res); + free_end = min(mapping_end, next->start - 1); + if (space_valid(is_pmem, is_reserve, label_id, res) + && free_start < free_end) { + available = free_end + 1 - free_start; + loc = ALLOC_MID; + } + } + + /* space at the end of the mapping */ + if (!loc && !next) { + free_start = res->start + resource_size(res); + free_end = mapping_end; + if (space_valid(is_pmem, is_reserve, label_id, res) + && free_start < free_end) { + available = free_end + 1 - free_start; + 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 */ + if (is_pmem && !is_reserve) + return n; + 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 */ + if (is_pmem && !is_reserve) + return n; + 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) + free_start += available - allocate; + else if (!is_reserve && free_start != nd_mapping->start) + return n; + + new_res = nvdimm_allocate_dpa(ndd, label_id, + free_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_nd_pmem(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_size(struct nd_region *nd_region, + struct nd_namespace_pmem *nspm, resource_size_t size) +{ + struct resource *res = &nspm->nsio.res; + + res->start = nd_region->ndr_start; + res->end = nd_region->ndr_start + size - 1; +} + +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_mapping *nd_mapping; + struct nvdimm_drvdata *ndd; + struct nd_label_id label_id; + u32 flags = 0, remainder; + u8 *uuid = NULL; + int rc, i; + + if (dev->driver || to_ndns(dev)->claim) + return -EBUSY; + + 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; + flags = NSLABEL_FLAG_LOCAL; + } + + /* + * We need a uuid for the allocation-label and dimm(s) on which + * to store the label. + */ + if (!uuid || nd_region->ndr_mappings == 0) + 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_size(nd_region, nspm, + val * nd_region->ndr_mappings); + } else if (is_namespace_blk(dev)) { + struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); + + /* + * Try to delete the namespace if we deleted all of its + * allocation, this is not the seed device for the + * region, and it is not actively claimed by a btt + * instance. + */ + if (val == 0 && nd_region->ns_seed != dev + && !nsblk->common.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, S_IRUGO, size_show, size_store); + +static ssize_t uuid_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + u8 *uuid; + + 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; + } else + return -ENXIO; + + 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 (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 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); + } + 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 ns_lbasize_supported[] = { 512, 520, 528, + 4096, 4104, 4160, 4224, 0 }; + +static ssize_t sector_size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); + + if (!is_namespace_blk(dev)) + return -ENXIO; + + return nd_sector_size_show(nsblk->lbasize, ns_lbasize_supported, buf); +} + +static ssize_t sector_size_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); + struct nd_region *nd_region = to_nd_region(dev->parent); + ssize_t rc = 0; + + if (!is_namespace_blk(dev)) + return -ENXIO; + + device_lock(dev); + nvdimm_bus_lock(dev); + if (to_ndns(dev)->claim) + rc = -EBUSY; + if (rc >= 0) + rc = nd_sector_size_store(dev, buf, &nsblk->lbasize, + ns_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 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 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[] = { + & |