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libnvdimm: blk labels and namespace instantiation

Browse source 
A blk label set describes a namespace comprised of one or more
discontiguous dpa ranges on a single dimm.  They may alias with one or
more pmem interleave sets that include the given dimm.

This is the runtime/volatile configuration infrastructure for sysfs
manipulation of 'alt_name', 'uuid', 'size', and 'sector_size'.  A later
patch will make these settings persistent by writing back the label(s).

Unlike pmem namespaces, multiple blk namespaces can be created per
region.  Once a blk namespace has been created a new seed device
(unconfigured child of a parent blk region) is instantiated.  As long as
a region has 'available_size' != 0 new child namespaces may be created.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2015-05-01 13:34:01 -04:00
parent bf9bccc14c
commit 1b40e09a12
8 changed files with 594 additions and 38 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

40
drivers/nvdimm/core.c
View file

@ -173,6 +173,46 @@ int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
return 0;
}
ssize_t nd_sector_size_show(unsigned long current_lbasize,
const unsigned long *supported, char *buf)
{
ssize_t len = 0;
int i;
for (i = 0; supported[i]; i++)
if (current_lbasize == supported[i])
len += sprintf(buf + len, "[%ld] ", supported[i]);
else
len += sprintf(buf + len, "%ld ", supported[i]);
len += sprintf(buf + len, "\n");
return len;
}
ssize_t nd_sector_size_store(struct device *dev, const char *buf,
unsigned long *current_lbasize, const unsigned long *supported)
{
unsigned long lbasize;
int rc, i;
if (dev->driver)
return -EBUSY;
rc = kstrtoul(buf, 0, &lbasize);
if (rc)
return rc;
for (i = 0; supported[i]; i++)
if (lbasize == supported[i])
break;
if (supported[i]) {
*current_lbasize = lbasize;
return 0;
} else {
return -EINVAL;
}
}
static ssize_t commands_show(struct device *dev,
struct device_attribute *attr, char *buf)
{

36
drivers/nvdimm/dimm_devs.c
View file

@ -289,6 +289,42 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
}
EXPORT_SYMBOL_GPL(nvdimm_create);
/**
* nd_blk_available_dpa - account the unused dpa of BLK region
* @nd_mapping: container of dpa-resource-root + labels
*
* Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges.
*/
resource_size_t nd_blk_available_dpa(struct nd_mapping *nd_mapping)
{
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
resource_size_t map_end, busy = 0, available;
struct resource *res;
if (!ndd)
return 0;
map_end = nd_mapping->start + nd_mapping->size - 1;
for_each_dpa_resource(ndd, res)
if (res->start >= nd_mapping->start && res->start < map_end) {
resource_size_t end = min(map_end, res->end);
busy += end - res->start + 1;
} else if (res->end >= nd_mapping->start
&& res->end <= map_end) {
busy += res->end - nd_mapping->start;
} else if (nd_mapping->start > res->start
&& nd_mapping->start < res->end) {
/* total eclipse of the BLK region mapping */
busy += nd_mapping->size;
}
available = map_end - nd_mapping->start + 1;
if (busy < available)
return available - busy;
return 0;
}
/**
* nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
* @nd_mapping: container of dpa-resource-root + labels

498
drivers/nvdimm/namespace_devs.c
View file

@ -35,7 +35,15 @@ static void namespace_pmem_release(struct device *dev)
static void namespace_blk_release(struct device *dev)
{
/* TODO: blk namespace support */
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 = {
@ -88,8 +96,9 @@ static ssize_t __alt_name_store(struct device *dev, const char *buf,
ns_altname = &nspm->alt_name;
} else if (is_namespace_blk(dev)) {
/* TODO: blk namespace support */
return -ENXIO;
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
ns_altname = &nsblk->alt_name;
} else
return -ENXIO;
@ -122,6 +131,24 @@ static ssize_t __alt_name_store(struct device *dev, const char *buf,
return rc;
}
static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
{
struct nd_region *nd_region = to_nd_region(nsblk->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 ssize_t alt_name_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
@ -148,8 +175,9 @@ static ssize_t alt_name_show(struct device *dev,
ns_altname = nspm->alt_name;
} else if (is_namespace_blk(dev)) {
/* TODO: blk namespace support */
return -ENXIO;
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
ns_altname = nsblk->alt_name;
} else
return -ENXIO;
@ -195,6 +223,8 @@ static int scan_free(struct nd_region *nd_region,
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;
}
@ -255,14 +285,15 @@ static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
return rc ? n : 0;
}
static bool space_valid(bool is_pmem, struct nd_label_id *label_id,
struct resource *res)
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.
* contiguous with an existing allocation unless we are
* reserving pmem.
*/
if (!is_pmem)
if (is_reserve || !is_pmem)
return true;
if (!res || strcmp(res->name, label_id->id) == 0)
return true;
@ -278,6 +309,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
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;
@ -303,7 +335,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
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))
if (space_valid(is_pmem, is_reserve, label_id, NULL))
loc = ALLOC_BEFORE;
}
@ -311,7 +343,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
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)
if (space_valid(is_pmem, is_reserve, label_id, res)
&& free_start < free_end) {
available = free_end + 1 - free_start;
loc = ALLOC_MID;
@ -322,7 +354,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
if (!loc && !next) {
free_start = res->start + resource_size(res);
free_end = mapping_end;
if (space_valid(is_pmem, label_id, res)
if (space_valid(is_pmem, is_reserve, label_id, res)
&& free_start < free_end) {
available = free_end + 1 - free_start;
loc = ALLOC_AFTER;
@ -336,7 +368,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
case ALLOC_BEFORE:
if (strcmp(res->name, label_id->id) == 0) {
/* adjust current resource up */
if (is_pmem)
if (is_pmem && !is_reserve)
return n;
rc = adjust_resource(res, res->start - allocate,
resource_size(res) + allocate);
@ -347,7 +379,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
case ALLOC_MID:
if (strcmp(next->name, label_id->id) == 0) {
/* adjust next resource up */
if (is_pmem)
if (is_pmem && !is_reserve)
return n;
rc = adjust_resource(next, next->start
- allocate, resource_size(next)
@ -373,7 +405,7 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
/* BLK allocate bottom up */
if (!is_pmem)
free_start += available - allocate;
else if (free_start != nd_mapping->start)
else if (!is_reserve && free_start != nd_mapping->start)
return n;
new_res = nvdimm_allocate_dpa(ndd, label_id,
@ -384,6 +416,8 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
/* 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)
@ -409,11 +443,108 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
return 0;
}
if (is_pmem && n == to_allocate)
/*
* 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
@ -430,13 +561,45 @@ static resource_size_t scan_allocate(struct nd_region *nd_region,
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];
int rc;
resource_size_t rem = n;
int rc, j;
rc = scan_allocate(nd_region, nd_mapping, label_id, n);
/*
* 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;
}
@ -472,8 +635,10 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
uuid = nspm->uuid;
} else if (is_namespace_blk(dev)) {
/* TODO: blk namespace support */
return -ENXIO;
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
uuid = nsblk->uuid;
flags = NSLABEL_FLAG_LOCAL;
}
/*
@ -528,6 +693,14 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
nd_namespace_pmem_set_size(nd_region, nspm,
val * nd_region->ndr_mappings);
} else if (is_namespace_blk(dev)) {
/*
* Try to delete the namespace if we deleted all of its
* allocation and this is not the seed device for the
* region.
*/
if (val == 0 && nd_region->ns_seed != dev)
nd_device_unregister(dev, ND_ASYNC);
}
return rc;
@ -554,8 +727,9 @@ static ssize_t size_store(struct device *dev,
uuid = &nspm->uuid;
} else if (is_namespace_blk(dev)) {
/* TODO: blk namespace support */
rc = -ENXIO;
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
uuid = &nsblk->uuid;
}
if (rc == 0 && val == 0 && uuid) {
@ -576,21 +750,23 @@ static ssize_t size_store(struct device *dev,
static ssize_t size_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned long long size = 0;
nvdimm_bus_lock(dev);
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));
size = resource_size(&nspm->nsio.res);
} else if (is_namespace_blk(dev)) {
/* TODO: blk namespace support */
return -ENXIO;
size = 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 sprintf(buf, "%llu\n", (unsigned long long)
resource_size(&nsio->res));
} else
return -ENXIO;
size = resource_size(&nsio->res);
}
nvdimm_bus_unlock(dev);
return sprintf(buf, "%llu\n", size);
}
static DEVICE_ATTR(size, S_IRUGO, size_show, size_store);
@ -604,8 +780,9 @@ static ssize_t uuid_show(struct device *dev,
uuid = nspm->uuid;
} else if (is_namespace_blk(dev)) {
/* TODO: blk namespace support */
return -ENXIO;
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
uuid = nsblk->uuid;
} else
return -ENXIO;
@ -669,8 +846,9 @@ static ssize_t uuid_store(struct device *dev,
ns_uuid = &nspm->uuid;
} else if (is_namespace_blk(dev)) {
/* TODO: blk namespace support */
return -ENXIO;
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
ns_uuid = &nsblk->uuid;
} else
return -ENXIO;
@ -712,12 +890,48 @@ static ssize_t resource_show(struct device *dev,
}
static DEVICE_ATTR_RO(resource);
static const unsigned long ns_lbasize_supported[] = { 512, 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);
ssize_t rc;
if (!is_namespace_blk(dev))
return -ENXIO;
device_lock(dev);
nvdimm_bus_lock(dev);
rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
ns_lbasize_supported);
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(sector_size);
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,
&dev_attr_sector_size.attr,
NULL,
};
@ -735,6 +949,10 @@ static umode_t namespace_visible(struct kobject *kobj,
if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
if (a == &dev_attr_size.attr)
return S_IWUSR | S_IRUGO;
if (is_namespace_pmem(dev) && a == &dev_attr_sector_size.attr)
return 0;
return a->mode;
}
@ -1022,6 +1240,176 @@ static struct device **create_namespace_pmem(struct nd_region *nd_region)
return NULL;
}
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->dev;
dev->type = &namespace_blk_device_type;
nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
if (nsblk->id < 0) {
kfree(nsblk);
return NULL;
}
dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
dev->parent = &nd_region->dev;
dev->groups = nd_namespace_attribute_groups;
return &nsblk->dev;
}
void nd_region_create_blk_seed(struct nd_region *nd_region)
{
WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
nd_region->ns_seed = nd_namespace_blk_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 blk namespace\n");
else
nd_device_register(nd_region->ns_seed);
}
static struct device **create_namespace_blk(struct nd_region *nd_region)
{
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
struct nd_namespace_label *nd_label;
struct device *dev, **devs = NULL;
struct nd_namespace_blk *nsblk;
struct nvdimm_drvdata *ndd;
int i, l, count = 0;
struct resource *res;
if (nd_region->ndr_mappings == 0)
return NULL;
ndd = to_ndd(nd_mapping);
for_each_label(l, nd_label, nd_mapping->labels) {
u32 flags = __le32_to_cpu(nd_label->flags);
char *name[NSLABEL_NAME_LEN];
struct device **__devs;
if (flags & NSLABEL_FLAG_LOCAL)
/* pass */;
else
continue;
for (i = 0; i < count; i++) {
nsblk = to_nd_namespace_blk(devs[i]);
if (memcmp(nsblk->uuid, nd_label->uuid,
NSLABEL_UUID_LEN) == 0) {
res = nsblk_add_resource(nd_region, ndd, nsblk,
__le64_to_cpu(nd_label->dpa));
if (!res)
goto err;
nd_dbg_dpa(nd_region, ndd, res, "%s assign\n",
dev_name(&nsblk->dev));
break;
}
}
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;
nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
if (!nsblk)
goto err;
dev = &nsblk->dev;
dev->type = &namespace_blk_device_type;
dev->parent = &nd_region->dev;
dev_set_name(dev, "namespace%d.%d", nd_region->id, count);
devs[count++] = dev;
nsblk->id = -1;
nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
GFP_KERNEL);
if (!nsblk->uuid)
goto err;
memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
if (name[0])
nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
GFP_KERNEL);
res = nsblk_add_resource(nd_region, ndd, nsblk,
__le64_to_cpu(nd_label->dpa));
if (!res)
goto err;
nd_dbg_dpa(nd_region, ndd, res, "%s assign\n",
dev_name(&nsblk->dev));
}
dev_dbg(&nd_region->dev, "%s: discovered %d blk namespace%s\n",
__func__, count, count == 1 ? "" : "s");
if (count == 0) {
/* Publish a zero-sized namespace for userspace to configure. */
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;
}
devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
if (!devs)
goto err;
nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
if (!nsblk)
goto err;
dev = &nsblk->dev;
dev->type = &namespace_blk_device_type;
dev->parent = &nd_region->dev;
devs[count++] = dev;
}
return devs;
err:
for (i = 0; i < count; i++) {
nsblk = to_nd_namespace_blk(devs[i]);
namespace_blk_release(&nsblk->dev);
}
kfree(devs);
return NULL;
}
static int init_active_labels(struct nd_region *nd_region)
{
int i;
@ -1087,6 +1475,9 @@ int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
case ND_DEVICE_NAMESPACE_PMEM:
devs = create_namespace_pmem(nd_region);
break;
case ND_DEVICE_NAMESPACE_BLK:
devs = create_namespace_blk(nd_region);
break;
default:
break;
}
@ -1095,15 +1486,50 @@ int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
if (!devs)
return -ENODEV;
nd_region->ns_seed = devs[0];
for (i = 0; devs[i]; i++) {
struct device *dev = devs[i];
int id;
dev_set_name(dev, "namespace%d.%d", nd_region->id, i);
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
id = i;
if (id < 0)
break;
dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
dev->groups = nd_namespace_attribute_groups;
nd_device_register(dev);
}
if (i)
nd_region->ns_seed = devs[0];
if (devs[i]) {
int j;
for (j = i; devs[j]; j++) {
struct device *dev = devs[j];
device_initialize(dev);
put_device(dev);
}
*err = j - i;
/*
* All of the namespaces we tried to register failed, so
* fail region activation.
*/
if (*err == 0)
rc = -ENODEV;
}
kfree(devs);
if (rc == -ENODEV)
return rc;
return i;
}

8
drivers/nvdimm/nd-core.h
View file

@ -17,6 +17,7 @@
#include <linux/libnvdimm.h>
#include <linux/sizes.h>
#include <linux/mutex.h>
#include <linux/nd.h>
extern struct list_head nvdimm_bus_list;
extern struct mutex nvdimm_bus_list_mutex;
@ -48,6 +49,8 @@ struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
int __init nvdimm_bus_init(void);
void nvdimm_bus_exit(void);
void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev);
struct nd_region;
void nd_region_create_blk_seed(struct nd_region *nd_region);
void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev);
int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
@ -64,8 +67,13 @@ struct nvdimm_drvdata;
struct nd_mapping;
resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
struct nd_mapping *nd_mapping, resource_size_t *overlap);
resource_size_t nd_blk_available_dpa(struct nd_mapping *nd_mapping);
resource_size_t nd_region_available_dpa(struct nd_region *nd_region);
resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
struct nd_label_id *label_id);
struct nd_mapping;
struct resource *nsblk_add_resource(struct nd_region *nd_region,
struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
resource_size_t start);
void get_ndd(struct nvdimm_drvdata *ndd);
#endif /* __ND_CORE_H__ */

5
drivers/nvdimm/nd.h
View file

@ -73,6 +73,7 @@ static inline struct nd_namespace_index *to_next_namespace_index(
struct nd_region {
struct device dev;
struct ida ns_ida;
struct device *ns_seed;
u16 ndr_mappings;
u64 ndr_size;
@ -102,6 +103,10 @@ void nd_device_register(struct device *dev);
void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
size_t len);
ssize_t nd_sector_size_show(unsigned long current_lbasize,
const unsigned long *supported, char *buf);
ssize_t nd_sector_size_store(struct device *dev, const char *buf,
unsigned long *current_lbasize, const unsigned long *supported);
int __init nvdimm_init(void);
int __init nd_region_init(void);
void nvdimm_exit(void);

17
drivers/nvdimm/region_devs.c
View file

@ -118,7 +118,12 @@ static int is_uuid_busy(struct device *dev, void *data)
break;
}
case ND_DEVICE_NAMESPACE_BLK: {
/* TODO: blk namespace support */
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
if (!nsblk->uuid)
break;
if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) == 0)
return -EBUSY;
break;
}
default:
@ -230,7 +235,7 @@ resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
goto retry;
}
} else if (is_nd_blk(&nd_region->dev)) {
/* TODO: BLK Namespace support */
available += nd_blk_available_dpa(nd_mapping);
}
}
@ -360,6 +365,13 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
nd_mapping->ndd = NULL;
atomic_dec(&nvdimm->busy);
}
} else if (dev->parent && is_nd_blk(dev->parent) && probe) {
struct nd_region *nd_region = to_nd_region(dev->parent);
nvdimm_bus_lock(dev);
if (nd_region->ns_seed == dev)
nd_region_create_blk_seed(nd_region);
nvdimm_bus_unlock(dev);
}
}
@ -533,6 +545,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
nd_region->ndr_mappings = ndr_desc->num_mappings;
nd_region->provider_data = ndr_desc->provider_data;
nd_region->nd_set = ndr_desc->nd_set;
ida_init(&nd_region->ns_ida);
dev = &nd_region->dev;
dev_set_name(dev, "region%d", nd_region->id);
dev->parent = &nvdimm_bus->dev;

3
include/linux/libnvdimm.h
View file

@ -27,6 +27,9 @@ enum {
ND_CMD_MAX_ENVELOPE = 16,
ND_CMD_ARS_STATUS_MAX = SZ_4K,
ND_MAX_MAPPINGS = 32,
/* mark newly adjusted resources as requiring a label update */
DPA_RESOURCE_ADJUSTED = 1 << 0,
};
extern struct attribute_group nvdimm_bus_attribute_group;

25
include/linux/nd.h
View file

@ -50,6 +50,26 @@ struct nd_namespace_pmem {
u8 *uuid;
};
/**
* struct nd_namespace_blk - namespace for dimm-bounded persistent memory
* @dev: namespace device creation by the nd region driver
* @alt_name: namespace name supplied in the dimm label
* @uuid: namespace name supplied in the dimm label
* @id: ida allocated id
* @lbasize: blk namespaces have a native sector size when btt not present
* @num_resources: number of dpa extents to claim
* @res: discontiguous dpa extents for given dimm
*/
struct nd_namespace_blk {
struct device dev;
char *alt_name;
u8 *uuid;
int id;
unsigned long lbasize;
int num_resources;
struct resource **res;
};
static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
{
return container_of(dev, struct nd_namespace_io, dev);
@ -62,6 +82,11 @@ static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
return container_of(nsio, struct nd_namespace_pmem, nsio);
}
static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev)
{
return container_of(dev, struct nd_namespace_blk, dev);
}
#define MODULE_ALIAS_ND_DEVICE(type) \
MODULE_ALIAS("nd:t" __stringify(type) "*")
#define ND_DEVICE_MODALIAS_FMT "nd:t%d"