/*
* 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)
{
/* TODO: blk namespace support */
}
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;
}
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)) {
/* TODO: blk namespace support */
return -ENXIO;
} else
return -ENXIO;
if (dev->driver)
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 ssize_t alt_name_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
ssize_t rc;
device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = __alt_name_store(dev, buf, len);
dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
nvdimm_bus_unlock(dev);
device_unlock(dev);
return rc;
}
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)) {
/* TODO: blk namespace support */
return -ENXIO;
} 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);
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, 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.
*/
if (!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_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, 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, 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, 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)
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)
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 (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 (!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 (is_pmem && n == to_allocate)
return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
return n;
}
/**
* grow_dpa_allocation - for each dimm allocate n bytes for @label_id
* @nd_region: the set of dimms to allocate @n more bytes from
* @label_id: unique identifier for the namespace consuming this dpa range
* @n: number of bytes per-dimm to add to the existing allocation
*
* Assumes resources are ordered. For BLK regions, first consume
* BLK-only available DPA free space, then consume PMEM-aliased DPA
* space starting at the highest DPA. For PMEM regions start
* allocations from the start of an interleave set and end at the first
* BLK allocation or the end of the interleave set, whichever comes
* first.
*/
static int grow_dpa_allocation(struct nd_region *nd_region,
struct nd_label_id *label_id, resource_size_t n)
{
int i;
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
int rc;
rc = scan_allocate(nd_region, nd_mapping, label_id, n);
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)
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)) {
/* TODO: blk namespace support */
return -ENXIO;
}
/*
* 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);
}
return rc;
}
static ssize_t size_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
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 (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
uuid = &nspm->uuid;
} else if (is_namespace_blk(dev)) {
/* TODO: blk namespace support */
rc = -ENXIO;
}
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 ? rc : len;
}
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
return sprintf(buf, "%llu\n", (unsigned long long)
resource_size(&nspm->nsio.res));
} else if (is_namespace_blk(dev)) {
/* TODO: blk namespace support */
return -ENXIO;
} else if (is_namespace_io(dev)) {
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
return sprintf(buf, "%llu\n", (unsigned long long)
resource_size(&nsio->res));
} else
return -ENXIO;
}
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)) {
/* TODO: blk namespace support */
return -ENXIO;
} 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, rc;
rc = nd_is_uuid_unique(dev, new_uuid) ? 0 : -EINVAL;
if (rc) {
kfree(new_uuid);
return rc;
}
if (*old_uuid == NULL)
goto out;
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;
u8 **ns_uuid;
ssize_t rc;
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)) {
/* TODO: blk namespace support */
return -ENXIO;
} else
return -ENXIO;
device_lock(dev);
nvdimm_bus_lock(dev);
wait_nvdimm_bus_probe_idle(dev);
rc = nd_uuid_store(dev, &uuid, buf, len);
if (rc >= 0)
rc = namespace_update_uuid(nd_region, dev, uuid, ns_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 ? 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 struct attribute *nd_namespace_attributes[] = {
&dev_attr_nstype.attr,
&dev_attr_size.attr,
&dev_attr_uuid.attr,
&dev_attr_resource.attr,
&dev_attr_alt_name.attr,
NULL,
};
static umode_t namespace_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
if (a == &dev_attr_resource.attr) {
if (is_namespace_blk(dev))
return 0;
return a->mode;
}
if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
if (a == &dev_attr_size.attr)
return S_IWUSR | S_IRUGO;
return a->mode;
}
if (a == &dev_attr_nstype.attr || a == &dev_attr_size.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,
NULL,
};
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->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_namespace_label *nd_label;
bool found_uuid = false;
int l;
for_each_label(l, nd_label, nd_mapping->labels) {
u64 isetcookie = __le64_to_cpu(nd_label->isetcookie);
u16 position = __le16_to_cpu(nd_label->position);
u16 nlabel = __le16_to_cpu(nd_label->nlabel);
if (isetcookie != cookie)
continue;
if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
continue;
if (found_uuid) {
dev_dbg(to_ndd(nd_mapping)->dev,
"%s duplicate entry for uuid\n",
__func__);
return false;
}
found_uuid = true;
if (nlabel != nd_region->ndr_mappings)
continue;
if (position != pos)
continue;
found = nd_label;
break;
}
if (found)
break;
}
return found != NULL;
}
static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
{
struct nd_namespace_label *select = NULL;
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 nd_namespace_label *nd_label;
u64 hw_start, hw_end, pmem_start, pmem_end;
int l;
for_each_label(l, nd_label, nd_mapping->labels)
if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
break;
if (!nd_label) {
WARN_ON(1);
return -EINVAL;
}
select = nd_label;
/*
* 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(select->dpa);
pmem_end = pmem_start + __le64_to_cpu(select->rawsize);
if (pmem_start == hw_start && pmem_end <= hw_end)
/* pass */;
else
return -EINVAL;
nd_mapping->labels[0] = select;
nd_mapping->labels[1] = NULL;
}
return 0;
}
/**
* find_pmem_label_set - validate interleave set labelling, retrieve label0
* @nd_region: region with mappings to validate
*/
static int find_pmem_label_set(struct nd_region *nd_region,
struct nd_namespace_pmem *nspm)
{
u64 cookie = nd_region_interleave_set_cookie(nd_region);
struct nd_namespace_label *nd_label;
u8 select_id[NSLABEL_UUID_LEN];
resource_size_t size = 0;
u8 *pmem_id = NULL;
int rc = -ENODEV, l;
u16 i;
if (cookie == 0)
return -ENXIO;
/*
* Find a complete set of labels by uuid. By definition we can start
* with any mapping as the reference label
*/
for_each_label(l, nd_label, nd_region->mapping[0].labels) {
u64 isetcookie = __le64_to_cpu(nd_label->isetcookie);
if (isetcookie != cookie)
continue;
for (i = 0; nd_region->ndr_mappings; i++)
if (!has_uuid_at_pos(nd_region, nd_label->uuid,
cookie, i))
break;
if (i < nd_region->ndr_mappings) {
/*
* 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.
*/
rc = -EINVAL;
goto err;
} else if (pmem_id) {
/*
* If there is more than one valid uuid set, we
* need userspace to clean this up.
*/
rc = -EBUSY;
goto err;
}
memcpy(select_id, nd_label->uuid, NSLABEL_UUID_LEN);
pmem_id = select_id;
}
/*
* 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, pmem_id);
if (rc)
goto err;
/* Calculate total size and populate namespace properties from label0 */
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
struct nd_namespace_label *label0 = nd_mapping->labels[0];
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);
}
if (!nspm->alt_name || !nspm->uuid) {
rc = -ENOMEM;
goto err;
}
nd_namespace_pmem_set_size(nd_region, nspm, size);
return 0;
err:
switch (rc) {
case -EINVAL:
dev_dbg(&nd_region->dev, "%s: invalid label(s)\n", __func__);
break;
case -ENODEV:
dev_dbg(&nd_region->dev, "%s: label not found\n", __func__);
break;
default:
dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n",
__func__, rc);
break;
}
return rc;
}
static struct device **create_namespace_pmem(struct nd_region *nd_region)
{
struct nd_namespace_pmem *nspm;
struct device *dev, **devs;
struct resource *res;
int rc;
nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
if (!nspm)
return NULL;
dev = &nspm->nsio.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;
rc = find_pmem_label_set(nd_region, nspm);
if (rc == -ENODEV) {
int i;
/* Pass, try to permit namespace creation... */
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
kfree(nd_mapping->labels);
nd_mapping->labels = NULL;
}
/* Publish a zero-sized namespace for userspace to configure. */
nd_namespace_pmem_set_size(nd_region, nspm, 0);
rc = 0;
} else if (rc)
goto err;
devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
if (!devs)
goto err;
devs[0] = dev;
return devs;
err:
namespace_pmem_release(&nspm->nsio.dev);
return NULL;
}
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;
int count, j;
/*
* If the dimm is disabled then prevent the region from
* being activated if it aliases DPA.
*/
if (!ndd) {
if ((nvdimm->flags & NDD_ALIASING) == 0)
return 0;
dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
dev_name(&nd_mapping->nvdimm->dev));
return -ENXIO;
}
nd_mapping->ndd = ndd;
atomic_inc(&nvdimm->busy);
get_ndd(ndd);
count = nd_label_active_count(ndd);
dev_dbg(ndd->dev, "%s: %d\n", __func__, count);
if (!count)
continue;
nd_mapping->labels = kcalloc(count + 1, sizeof(void *),
GFP_KERNEL);
if (!nd_mapping->labels)
return -ENOMEM;
for (j = 0; j < count; j++) {
struct nd_namespace_label *label;
label = nd_label_active(ndd, j);
nd_mapping->labels[j] = label;
}
}
return 0;
}
int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
{
struct device **devs = NULL;
int i, rc = 0, type;
*err = 0;
nvdimm_bus_lock(&nd_region->dev);
rc = init_active_labels(nd_region);
if (rc) {
nvdimm_bus_unlock(&nd_region->dev);
return rc;
}
type = nd_region_to_nstype(nd_region);
switch (type) {
case ND_DEVICE_NAMESPACE_IO:
devs = create_namespace_io(nd_region);
break;
case ND_DEVICE_NAMESPACE_PMEM:
devs = create_namespace_pmem(nd_region);
break;
default:
break;
}
nvdimm_bus_unlock(&nd_region->dev);
if (!devs)
return -ENODEV;
nd_region->ns_seed = devs[0];
for (i = 0; devs[i]; i++) {
struct device *dev = devs[i];
dev_set_name(dev, "namespace%d.%d", nd_region->id, i);
dev->groups = nd_namespace_attribute_groups;
nd_device_register(dev);
}
kfree(devs);
return i;
}
