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linux/drivers/nvdimm/namespace_devs.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/sort.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/nd.h>
#include "nd-core.h"
#include "pmem.h"
#include "pfn.h"
#include "nd.h"
static void namespace_io_release(struct device *dev)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
kfree(nsio);
}
static void namespace_pmem_release(struct device *dev)
{
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
struct nd_region *nd_region = to_nd_region(dev->parent);
if (nspm->id >= 0)
ida_simple_remove(&nd_region->ns_ida, nspm->id);
kfree(nspm->alt_name);
kfree(nspm->uuid);
kfree(nspm);
}
static 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 bool is_namespace_pmem(const struct device *dev);
static bool is_namespace_blk(const struct device *dev);
static bool is_namespace_io(const struct device *dev);
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 = kstrndup(buf, len, GFP_KERNEL);
if (!input)
return -ENOMEM;
pos = strim(input);
if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
rc = -EINVAL;
goto out;
}
alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
if (!alt_name) {
rc = -ENOMEM;
goto out;
}
kfree(*ns_altname);
*ns_altname = alt_name;
sprintf(*ns_altname, "%s", pos);
rc = len;
out:
kfree(input);
return rc;
}
static 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;
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __alt_name_store(dev, buf, len);
if (rc >= 0)
rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev);
nd_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;
unsigned long align;
align = nd_region->align / nd_region->ndr_mappings;
valid->start = ALIGN(valid->start, align);
valid->end = ALIGN_DOWN(valid->end + 1, align) - 1;
if (valid->start >= valid->end)
goto invalid;
if (is_reserve)
return;
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;
}
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;
}
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, "not associated with dimm(s)\n");
return -ENXIO;
}
div_u64_rem(val, nd_region->align, &remainder);
if (remainder) {
dev_dbg(dev, "%llu is not %ldK aligned\n", val,
nd_region->align / SZ_1K);
return -EINVAL;
}
nd_label_gen_id(&label_id, uuid, flags);
for (i = 0; i < nd_region->ndr_mappings; i++) {
nd_mapping = &nd_region->mapping[i];
ndd = to_ndd(nd_mapping);
/*
* All dimms in an interleave set, 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_allocatable_dpa(nd_region);
if (val > available + allocated)
return -ENOSPC;
if (val == allocated)
return 0;
val = div_u64(val, nd_region->ndr_mappings);
allocated = div_u64(allocated, nd_region->ndr_mappings);
if (val < allocated)
rc = shrink_dpa_allocation(nd_region, &label_id,
allocated - val);
else
rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
if (rc)
return rc;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
nd_namespace_pmem_set_resource(nd_region, nspm,
val * nd_region->ndr_mappings);
}
/*
* Try to delete the namespace if we deleted all of its
* allocation, this is not the seed or 0th device for the
* region, and it is not actively claimed by a btt, pfn, or dax
* instance.
*/
if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
nd_device_unregister(dev, ND_ASYNC);
return rc;
}
static ssize_t size_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
unsigned long long val;
u8 **uuid = NULL;
int rc;
rc = kstrtoull(buf, 0, &val);
if (rc)
return rc;
nd_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, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
nvdimm_bus_unlock(dev);
nd_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);
bool nvdimm_namespace_locked(struct nd_namespace_common *ndns)
{
int i;
bool locked = false;
struct device *dev = &ndns->dev;
struct nd_region *nd_region = to_nd_region(dev->parent);
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
struct nvdimm *nvdimm = nd_mapping->nvdimm;
if (test_bit(NDD_LOCKED, &nvdimm->flags)) {
dev_dbg(dev, "%s locked\n", nvdimm_name(nvdimm));
locked = true;
}
}
return locked;
}
EXPORT_SYMBOL(nvdimm_namespace_locked);
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%llu\n", (unsigned long long)
nvdimm_namespace_capacity(to_ndns(dev)));
}
static DEVICE_ATTR(size, 0444, size_show, size_store);
static 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;
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
if (to_ndns(dev)->claim)
rc = -EBUSY;
if (rc >= 0)
rc = nd_uuid_store(dev, &uuid, buf, len);
if (rc >= 0)
rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
if (rc >= 0)
rc = nd_namespace_label_update(nd_region, dev);
else
kfree(uuid);
dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
nd_device_unlock(dev);
return rc < 0 ? rc : len;
}
static DEVICE_ATTR_RW(uuid);
static ssize_t resource_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct resource *res;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
res = &nspm->nsio.res;
} else if (is_namespace_io(dev)) {
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
res = &nsio->res;
} else
return -ENXIO;
/* no address to convey if the namespace has no allocation */
if (resource_size(res) == 0)
return -ENXIO;
return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
}
static DEVICE_ATTR_ADMIN_RO(resource);
static const unsigned long 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;
nd_device_lock(dev);
nvdimm_bus_lock(dev);
if (to_ndns(dev)->claim)
rc = -EBUSY;
if (rc >= 0)
rc = nd_size_select_store(dev, buf, lbasize, supported);
if (rc >= 0)
rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
buf, buf[len - 1] == '\n' ? "" : "\n");
nvdimm_bus_unlock(dev);
nd_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;
nd_device_lock(dev);
rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
nd_device_unlock(dev);
return rc;
}
static DEVICE_ATTR_RO(holder);
static int __holder_class_store(struct device *dev, const char *buf)
{
struct nd_namespace_common *ndns = to_ndns(dev);
if (dev->driver || ndns->claim)
return -EBUSY;
if (sysfs_streq(buf, "btt")) {
int rc = btt_claim_class(dev);
if (rc < NVDIMM_CCLASS_NONE)
return rc;
ndns->claim_class = rc;
} else if (sysfs_streq(buf, "pfn"))
ndns->claim_class = NVDIMM_CCLASS_PFN;
else if (sysfs_streq(buf, "dax"))
ndns->claim_class = NVDIMM_CCLASS_DAX;
else if (sysfs_streq(buf, ""))
ndns->claim_class = NVDIMM_CCLASS_NONE;
else
return -EINVAL;
return 0;
}
static ssize_t holder_class_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
int rc;
nd_device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __holder_class_store(dev, buf);
if (rc >= 0)
rc = nd_namespace_label_update(nd_region, dev);
dev_dbg(dev, "%s(%d)\n", rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev);
nd_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;
nd_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");
nd_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;
nd_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);
nd_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 && is_namespace_blk(dev))
return 0;
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,
};
static const struct device_type namespace_io_device_type = {
.name = "nd_namespace_io",
.release = namespace_io_release,
.groups = nd_namespace_attribute_groups,
};
static const struct device_type namespace_pmem_device_type = {
.name = "nd_namespace_pmem",
.release = namespace_pmem_release,
.groups = nd_namespace_attribute_groups,
};
static const struct device_type namespace_blk_device_type = {
.name = "nd_namespace_blk",
.release = namespace_blk_release,
.groups = nd_namespace_attribute_groups,
};
static bool is_namespace_pmem(const struct device *dev)
{
return dev ? dev->type == &namespace_pmem_device_type : false;
}
static bool is_namespace_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;
}
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.
*/
nd_device_lock(&ndns->dev);
nd_device_unlock(&ndns->dev);
if (ndns->dev.driver) {
dev_dbg(&ndns->dev, "is active, can't bind %s\n",
dev_name(dev));
return ERR_PTR(-EBUSY);
}
if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
"host (%s) vs claim (%s) mismatch\n",
dev_name(dev),
dev_name(ndns->claim)))
return ERR_PTR(-ENXIO);
} else {
ndns = to_ndns(dev);
if (ndns->claim) {
dev_dbg(dev, "claimed by %s, failing probe\n",
dev_name(ndns->claim));
return ERR_PTR(-ENXIO);
}
}
if (nvdimm_namespace_locked(ndns))
return ERR_PTR(-EACCES);
size = nvdimm_namespace_capacity(ndns);
if (size < ND_MIN_NAMESPACE_SIZE) {
dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
&size, ND_MIN_NAMESPACE_SIZE);
return ERR_PTR(-ENODEV);
}
/*
* Note, alignment validation for fsdax and devdax mode
* namespaces happens in nd_pfn_validate() where infoblock
* padding parameters can be applied.
*/
if (pmem_should_map_pages(dev)) {
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
struct resource *res = &nsio->res;
if (!IS_ALIGNED(res->start | (res->end + 1),
memremap_compat_align())) {
dev_err(&ndns->dev, "%pr misaligned, unable to map\n", res);
return ERR_PTR(-EOPNOTSUPP);
}
}
if (is_namespace_pmem(&ndns->dev)) {
struct nd_namespace_pmem *nspm;
nspm = to_nd_namespace_pmem(&ndns->dev);
if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
return ERR_PTR(-ENODEV);
} 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, "sector size not set\n");
return ERR_PTR(-ENODEV);
}
if (!nd_namespace_blk_validate(nsblk))
return ERR_PTR(-ENODEV);
}
return ndns;
}
EXPORT_SYMBOL(nvdimm_namespace_common_probe);
int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns,
resource_size_t size)
{
if (is_namespace_blk(&ndns->dev))
return 0;
return devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev), size);
}
EXPORT_SYMBOL_GPL(devm_namespace_enable);
void devm_namespace_disable(struct device *dev, struct nd_namespace_common *ndns)
{
if (is_namespace_blk(&ndns->dev))
return;
devm_nsio_disable(dev, to_nd_namespace_io(&ndns->dev));
}
EXPORT_SYMBOL_GPL(devm_namespace_disable);
static struct device **create_namespace_io(struct nd_region *nd_region)
{
struct nd_namespace_io *nsio;
struct device *dev, **devs;
struct resource *res;
nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
if (!nsio)
return NULL;
devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
if (!devs) {
kfree(nsio);
return NULL;
}
dev = &nsio->common.dev;
dev->type = &namespace_io_device_type;
dev->parent = &nd_region->dev;
res = &nsio->res;
res->name = dev_name(&nd_region->dev);
res->flags = IORESOURCE_MEM;
res->start = nd_region->ndr_start;
res->end = res->start + nd_region->ndr_size - 1;
devs[0] = dev;
return devs;
}
static bool has_uuid_at_pos(struct nd_region *nd_region, 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,
&nd_label->type_guid);
continue;
}
if (found_uuid) {
dev_dbg(ndd->dev, "duplicate entry for uuid\n");
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
*/
static 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 : NULL;
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, "invalid label(s)\n");
break;
case -ENODEV:
dev_dbg(&nd_region->dev, "label not found\n");
break;
default:
dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
break;
}
return ERR_PTR(rc);
}
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;
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);
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;
}
static 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,
&nd_label->type_guid);
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 (__le64_to_cpu(nd_label->dpa) < nd_mapping->start ||
__le64_to_cpu(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, "discovered %d %s namespace%s\n",
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;
struct device **devs;
int i;
if (nd_region->ndr_mappings == 0)
return NULL;
/* lock down all mappings while we scan labels */
for (i = 0; i < nd_region->ndr_mappings; i++) {
nd_mapping = &nd_region->mapping[i];
mutex_lock_nested(&nd_mapping->lock, i);
}
devs = scan_labels(nd_region);
for (i = 0; i < nd_region->ndr_mappings; i++) {
int reverse = nd_region->ndr_mappings - 1 - i;
nd_mapping = &nd_region->mapping[reverse];
mutex_unlock(&nd_mapping->lock);
}
return devs;
}
static void deactivate_labels(void *region)
{
struct nd_region *nd_region = region;
int i;
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
struct nvdimm_drvdata *ndd = nd_mapping->ndd;
struct nvdimm *nvdimm = nd_mapping->nvdimm;
mutex_lock(&nd_mapping->lock);
nd_mapping_free_labels(nd_mapping);
mutex_unlock(&nd_mapping->lock);
put_ndd(ndd);
nd_mapping->ndd = NULL;
if (ndd)
atomic_dec(&nvdimm->busy);
}
}
static int init_active_labels(struct nd_region *nd_region)
{
int i;
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
struct nvdimm *nvdimm = nd_mapping->nvdimm;
struct nd_label_ent *label_ent;
int count, j;
/*
* If the dimm is disabled then we may need to prevent
* the region from being activated.
*/
if (!ndd) {
if (test_bit(NDD_LOCKED, &nvdimm->flags))
/* fail, label data may be unreadable */;
else if (test_bit(NDD_LABELING, &nvdimm->flags))
/* fail, labels needed to disambiguate dpa */;
else
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, "count: %d\n", count);
if (!count)
continue;
for (j = 0; j < count; j++) {
struct nd_namespace_label *label;
label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
if (!label_ent)
break;
label = nd_label_active(ndd, j);
if (test_bit(NDD_NOBLK, &nvdimm->flags)) {
u32 flags = __le32_to_cpu(label->flags);
flags &= ~NSLABEL_FLAG_LOCAL;
label->flags = __cpu_to_le32(flags);
}
label_ent->label = label;
mutex_lock(&nd_mapping->lock);
list_add_tail(&label_ent->list, &nd_mapping->labels);
mutex_unlock(&nd_mapping->lock);
}
if (j < count)
break;
}
if (i < nd_region->ndr_mappings) {
deactivate_labels(nd_region);
return -ENOMEM;
}
return devm_add_action_or_reset(&nd_region->dev, deactivate_labels,
nd_region);
}
int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
{
struct device **devs = NULL;
int i, rc = 0, type;
*err = 0;
nvdimm_bus_lock(&nd_region->dev);
rc = init_active_labels(nd_region);
if (rc) {
nvdimm_bus_unlock(&nd_region->dev);
return rc;
}
type = nd_region_to_nstype(nd_region);
switch (type) {
case ND_DEVICE_NAMESPACE_IO:
devs = create_namespace_io(nd_region);
break;
case ND_DEVICE_NAMESPACE_PMEM:
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);
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;
}
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