namespace_devs.c 63.0 KB
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/*
 * 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>
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#include <linux/sort.h>
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#include <linux/slab.h>
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#include <linux/pmem.h>
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#include <linux/list.h>
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#include <linux/nd.h>
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#include "nd-core.h"
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#include "nd.h"

static void namespace_io_release(struct device *dev)
{
	struct nd_namespace_io *nsio = to_nd_namespace_io(dev);

	kfree(nsio);
}

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static void namespace_pmem_release(struct device *dev)
{
	struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
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	struct nd_region *nd_region = to_nd_region(dev->parent);
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	if (nspm->id >= 0)
		ida_simple_remove(&nd_region->ns_ida, nspm->id);
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	kfree(nspm->alt_name);
	kfree(nspm->uuid);
	kfree(nspm);
}

static void namespace_blk_release(struct device *dev)
{
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	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);
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}

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static const struct device_type namespace_io_device_type = {
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	.name = "nd_namespace_io",
	.release = namespace_io_release,
};

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static const struct device_type namespace_pmem_device_type = {
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	.name = "nd_namespace_pmem",
	.release = namespace_pmem_release,
};

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static const struct device_type namespace_blk_device_type = {
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	.name = "nd_namespace_blk",
	.release = namespace_blk_release,
};

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static bool is_namespace_pmem(const struct device *dev)
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{
	return dev ? dev->type == &namespace_pmem_device_type : false;
}

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static bool is_namespace_blk(const struct device *dev)
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{
	return dev ? dev->type == &namespace_blk_device_type : false;
}

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static bool is_namespace_io(const struct device *dev)
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{
	return dev ? dev->type == &namespace_io_device_type : false;
}

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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_pmem(dev) || is_nd_blk(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;
}

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bool pmem_should_map_pages(struct device *dev)
{
	struct nd_region *nd_region = to_nd_region(dev->parent);
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	struct nd_namespace_io *nsio;
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	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;

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	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;

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#ifdef ARCH_MEMREMAP_PMEM
	return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
#else
	return false;
#endif
}
EXPORT_SYMBOL(pmem_should_map_pages);

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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);

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const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
		char *name)
{
	struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
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	const char *suffix = NULL;
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	if (ndns->claim && is_nd_btt(ndns->claim))
		suffix = "s";
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	if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
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		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 : "");
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	} else if (is_namespace_blk(&ndns->dev)) {
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		struct nd_namespace_blk *nsblk;

		nsblk = to_nd_namespace_blk(&ndns->dev);
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		sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
				suffix ? suffix : "");
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	} else {
		return NULL;
	}

	return name;
}
EXPORT_SYMBOL(nvdimm_namespace_disk_name);

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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);

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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);

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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)) {
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		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		ns_altname = &nsblk->alt_name;
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	} else
		return -ENXIO;

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	if (dev->driver || to_ndns(dev)->claim)
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		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;
}

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static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
{
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	struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
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	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;
}

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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;
		/*
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		 * Resources with unacknowledged adjustments indicate a
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		 * 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);


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static int nd_namespace_label_update(struct nd_region *nd_region,
		struct device *dev)
{
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	dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
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			"namespace must be idle during label update\n");
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	if (dev->driver || to_ndns(dev)->claim)
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		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);
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		resource_size_t size = resource_size(&nspm->nsio.res);
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		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)) {
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		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);
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	} else
		return -ENXIO;
}

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static ssize_t alt_name_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
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	struct nd_region *nd_region = to_nd_region(dev->parent);
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	ssize_t rc;

	device_lock(dev);
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
	rc = __alt_name_store(dev, buf, len);
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	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
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	dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

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	return rc < 0 ? rc : len;
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}

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)) {
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		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		ns_altname = nsblk->alt_name;
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	} 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);
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		if (rc == 0)
			res->flags |= DPA_RESOURCE_ADJUSTED;
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		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;
}

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/**
 * 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)
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{
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	bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
	bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;

	if (valid->start >= valid->end)
		goto invalid;

	if (is_reserve)
		return;

	if (!is_pmem) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[0];
		struct nvdimm_bus *nvdimm_bus;
		struct blk_alloc_info info = {
			.nd_mapping = nd_mapping,
			.available = nd_mapping->size,
			.res = valid,
		};

		WARN_ON(!is_nd_blk(&nd_region->dev));
		nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
		device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
		return;
	}

	/* allocation needs to be contiguous, so this is all or nothing */
	if (resource_size(valid) < n)
		goto invalid;

	/* we've got all the space we need and no existing allocation */
	if (!exist)
		return;

	/* allocation needs to be contiguous with the existing namespace */
	if (valid->start == exist->end + 1
			|| valid->end == exist->start - 1)
		return;

 invalid:
	/* truncate @valid size to 0 */
	valid->end = valid->start - 1;
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}

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);
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	struct resource *res, *exist = NULL, valid;
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	const resource_size_t to_allocate = n;
	int first;

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	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";
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 retry:
	first = 0;
	for_each_dpa_resource(ndd, res) {
		struct resource *next = res->sibling, *new_res = NULL;
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		resource_size_t allocate, available = 0;
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		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) {
658 659 660 661 662 663
			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)
664 665 666 667 668
				loc = ALLOC_BEFORE;
		}

		/* space between allocations */
		if (!loc && next) {
669 670 671 672 673 674
			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)
675 676 677 678 679
				loc = ALLOC_MID;
		}

		/* space at the end of the mapping */
		if (!loc && !next) {
680 681 682 683 684 685
			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)
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727
				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)
728
				valid.start += available - allocate;
729 730

			new_res = nvdimm_allocate_dpa(ndd, label_id,
731
					valid.start, allocate);
732 733 734 735 736 737
			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);
738 739
			if (rc == 0)
				res->flags |= DPA_RESOURCE_ADJUSTED;
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764
		}

		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;
	}

765 766 767 768 769 770
	/*
	 * 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)
771 772 773 774
		return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
	return n;
}

775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866
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;
}

867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882
/**
 * 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)
{
883 884
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
	bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
885 886 887 888
	int i;

	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907
		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);
908

909 910 911 912 913 914 915 916 917 918 919 920 921
			/* 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);
922 923 924 925 926 927 928
		if (rc)
			return rc;
	}

	return 0;
}

929
static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
930 931 932
		struct nd_namespace_pmem *nspm, resource_size_t size)
{
	struct resource *res = &nspm->nsio.res;
933
	resource_size_t offset = 0;
934

935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
	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;
968 969
}

970 971 972 973 974 975 976 977 978
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;
}

979 980 981 982
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);
983
	struct nd_namespace_common *ndns = to_ndns(dev);
984 985 986 987
	struct nd_mapping *nd_mapping;
	struct nvdimm_drvdata *ndd;
	struct nd_label_id label_id;
	u32 flags = 0, remainder;
988
	int rc, i, id = -1;
989 990
	u8 *uuid = NULL;

991
	if (dev->driver || ndns->claim)
992 993 994 995 996 997
		return -EBUSY;

	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

		uuid = nspm->uuid;
998
		id = nspm->id;
999
	} else if (is_namespace_blk(dev)) {
1000 1001 1002 1003
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		uuid = nsblk->uuid;
		flags = NSLABEL_FLAG_LOCAL;
1004
		id = nsblk->id;
1005 1006 1007 1008 1009 1010
	}

	/*
	 * We need a uuid for the allocation-label and dimm(s) on which
	 * to store the label.
	 */
1011
	if (uuid_not_set(uuid, dev, __func__))
1012
		return -ENXIO;
1013 1014 1015 1016
	if (nd_region->ndr_mappings == 0) {
		dev_dbg(dev, "%s: not associated with dimm(s)\n", __func__);
		return -ENXIO;
	}
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060

	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);

1061
		nd_namespace_pmem_set_resource(nd_region, nspm,
1062 1063 1064
				val * nd_region->ndr_mappings);
	}

1065 1066
	/*
	 * Try to delete the namespace if we deleted all of its
1067 1068 1069
	 * 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.
1070
	 */
1071
	if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
1072 1073
		nd_device_unregister(dev, ND_ASYNC);

1074 1075 1076 1077 1078 1079
	return rc;
}

static ssize_t size_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
D
Dan Williams 已提交
1080
	struct nd_region *nd_region = to_nd_region(dev->parent);
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
	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);
D
Dan Williams 已提交
1093 1094
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
1095 1096 1097 1098 1099 1100

	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

		uuid = &nspm->uuid;
	} else if (is_namespace_blk(dev)) {
1101 1102 1103
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		uuid = &nsblk->uuid;
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
	}

	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);

D
Dan Williams 已提交
1118
	return rc < 0 ? rc : len;
1119 1120
}

1121
resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1122
{
1123
	struct device *dev = &ndns->dev;
1124

1125 1126 1127
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

1128
		return resource_size(&nspm->nsio.res);
1129
	} else if (is_namespace_blk(dev)) {
1130
		return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1131 1132 1133
	} else if (is_namespace_io(dev)) {
		struct nd_namespace_io *nsio = to_nd_namespace_io(dev);

1134 1135 1136 1137 1138 1139 1140 1141 1142
		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;
1143

1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
	nvdimm_bus_lock(&ndns->dev);
	size = __nvdimm_namespace_capacity(ndns);
	nvdimm_bus_unlock(&ndns->dev);

	return size;
}
EXPORT_SYMBOL(nvdimm_namespace_capacity);

static ssize_t size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%llu\n", (unsigned long long)
			nvdimm_namespace_capacity(to_ndns(dev)));
1157
}
1158
static DEVICE_ATTR(size, 0444, size_show, size_store);
1159

1160
static u8 *namespace_to_uuid(struct device *dev)
1161 1162 1163 1164
{
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

1165
		return nspm->uuid;
1166
	} else if (is_namespace_blk(dev)) {
1167 1168
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

1169
		return nsblk->uuid;
1170
	} else
1171 1172 1173 1174 1175 1176 1177
		return ERR_PTR(-ENXIO);
}

static ssize_t uuid_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	u8 *uuid = namespace_to_uuid(dev);
1178

1179 1180
	if (IS_ERR(uuid))
		return PTR_ERR(uuid);
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
	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;
D
Dan Williams 已提交
1199
	int i;
1200

D
Dan Williams 已提交
1201 1202
	if (!nd_is_uuid_unique(dev, new_uuid))
		return -EINVAL;
1203 1204 1205 1206

	if (*old_uuid == NULL)
		goto out;

D
Dan Williams 已提交
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
	/*
	 * 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?
		 */
1223
		if (list_empty(&nd_mapping->labels))
D
Dan Williams 已提交
1224 1225 1226
			return -EBUSY;
	}

1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
	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;
1250
	ssize_t rc = 0;
1251 1252 1253 1254 1255 1256 1257
	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)) {
1258 1259 1260
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		ns_uuid = &nsblk->uuid;
1261 1262 1263 1264 1265 1266
	} else
		return -ENXIO;

	device_lock(dev);
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
1267 1268 1269 1270
	if (to_ndns(dev)->claim)
		rc = -EBUSY;
	if (rc >= 0)
		rc = nd_uuid_store(dev, &uuid, buf, len);
1271 1272
	if (rc >= 0)
		rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
D
Dan Williams 已提交
1273 1274 1275 1276
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
	else
		kfree(uuid);
1277 1278 1279 1280 1281
	dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
			rc, buf, buf[len - 1] == '\n' ? "" : "\n");
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

D
Dan Williams 已提交
1282
	return rc < 0 ? rc : len;
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
}
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);

1309
static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1310
	4096, 4104, 4160, 4224, 0 };
1311

1312 1313
static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };

1314 1315 1316
static ssize_t sector_size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
1317 1318
	if (is_namespace_blk(dev)) {
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1319

1320 1321 1322
		return nd_sector_size_show(nsblk->lbasize,
				blk_lbasize_supported, buf);
	}
1323

1324 1325 1326 1327 1328 1329 1330
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

		return nd_sector_size_show(nspm->lbasize,
				pmem_lbasize_supported, buf);
	}
	return -ENXIO;
1331 1332 1333 1334 1335
}

static ssize_t sector_size_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
D
Dan Williams 已提交
1336
	struct nd_region *nd_region = to_nd_region(dev->parent);
1337 1338
	const unsigned long *supported;
	unsigned long *lbasize;
1339
	ssize_t rc = 0;
1340

1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351
	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
1352 1353 1354 1355
		return -ENXIO;

	device_lock(dev);
	nvdimm_bus_lock(dev);
1356 1357 1358
	if (to_ndns(dev)->claim)
		rc = -EBUSY;
	if (rc >= 0)
1359
		rc = nd_sector_size_store(dev, buf, lbasize, supported);
D
Dan Williams 已提交
1360 1361 1362 1363 1364
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
	dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__,
			rc, rc < 0 ? "tried" : "wrote", buf,
			buf[len - 1] == '\n' ? "" : "\n");
1365 1366 1367 1368 1369 1370 1371
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

	return rc ? rc : len;
}
static DEVICE_ATTR_RW(sector_size);

D
Dan Williams 已提交
1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413
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);

1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
static ssize_t holder_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_namespace_common *ndns = to_ndns(dev);
	ssize_t rc;

	device_lock(dev);
	rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
	device_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(holder);

1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490
static ssize_t __holder_class_store(struct device *dev, const char *buf)
{
	struct nd_namespace_common *ndns = to_ndns(dev);

	if (dev->driver || ndns->claim)
		return -EBUSY;

	if (strcmp(buf, "btt") == 0 || strcmp(buf, "btt\n") == 0)
		ndns->claim_class = NVDIMM_CCLASS_BTT;
	else if (strcmp(buf, "pfn") == 0 || strcmp(buf, "pfn\n") == 0)
		ndns->claim_class = NVDIMM_CCLASS_PFN;
	else if (strcmp(buf, "dax") == 0 || strcmp(buf, "dax\n") == 0)
		ndns->claim_class = NVDIMM_CCLASS_DAX;
	else if (strcmp(buf, "") == 0 || strcmp(buf, "\n") == 0)
		ndns->claim_class = NVDIMM_CCLASS_NONE;
	else
		return -EINVAL;

	return 0;
}

static ssize_t holder_class_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
	struct nd_region *nd_region = to_nd_region(dev->parent);
	ssize_t rc;

	device_lock(dev);
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
	rc = __holder_class_store(dev, buf);
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
	dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

	return rc < 0 ? rc : len;
}

static ssize_t holder_class_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_namespace_common *ndns = to_ndns(dev);
	ssize_t rc;

	device_lock(dev);
	if (ndns->claim_class == NVDIMM_CCLASS_NONE)
		rc = sprintf(buf, "\n");
	else if (ndns->claim_class == NVDIMM_CCLASS_BTT)
		rc = sprintf(buf, "btt\n");
	else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
		rc = sprintf(buf, "pfn\n");
	else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
		rc = sprintf(buf, "dax\n");
	else
		rc = sprintf(buf, "<unknown>\n");
	device_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RW(holder_class);

1491 1492 1493 1494 1495 1496 1497 1498 1499 1500
static ssize_t mode_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_namespace_common *ndns = to_ndns(dev);
	struct device *claim;
	char *mode;
	ssize_t rc;

	device_lock(dev);
	claim = ndns->claim;
1501
	if (claim && is_nd_btt(claim))
1502
		mode = "safe";
1503 1504
	else if (claim && is_nd_pfn(claim))
		mode = "memory";
1505 1506
	else if (claim && is_nd_dax(claim))
		mode = "dax";
1507 1508
	else if (!claim && pmem_should_map_pages(dev))
		mode = "memory";
1509 1510 1511 1512 1513 1514 1515 1516 1517
	else
		mode = "raw";
	rc = sprintf(buf, "%s\n", mode);
	device_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(mode);

1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537
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);

1538 1539
static struct attribute *nd_namespace_attributes[] = {
	&dev_attr_nstype.attr,
1540
	&dev_attr_size.attr,
1541
	&dev_attr_mode.attr,
1542
	&dev_attr_uuid.attr,
1543
	&dev_attr_holder.attr,
1544 1545
	&dev_attr_resource.attr,
	&dev_attr_alt_name.attr,
1546
	&dev_attr_force_raw.attr,
1547
	&dev_attr_sector_size.attr,
D
Dan Williams 已提交
1548
	&dev_attr_dpa_extents.attr,
1549
	&dev_attr_holder_class.attr,
1550 1551 1552
	NULL,
};

1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
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)
1566
			return 0644;
1567

1568 1569 1570
		return a->mode;
	}

1571 1572
	if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
			|| a == &dev_attr_holder.attr
1573
			|| a == &dev_attr_holder_class.attr
1574 1575
			|| a == &dev_attr_force_raw.attr
			|| a == &dev_attr_mode.attr)
1576 1577 1578 1579 1580
		return a->mode;

	return 0;
}

1581 1582
static struct attribute_group nd_namespace_attribute_group = {
	.attrs = nd_namespace_attributes,
1583
	.is_visible = namespace_visible,
1584 1585 1586 1587 1588
};

static const struct attribute_group *nd_namespace_attribute_groups[] = {
	&nd_device_attribute_group,
	&nd_namespace_attribute_group,
1589
	&nd_numa_attribute_group,
1590 1591 1592
	NULL,
};

1593 1594 1595
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;
1596
	struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1597
	struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1598
	struct nd_namespace_common *ndns = NULL;
1599 1600
	resource_size_t size;

1601
	if (nd_btt || nd_pfn || nd_dax) {
1602
		if (nd_btt)
1603
			ndns = nd_btt->ndns;
1604
		else if (nd_pfn)
1605
			ndns = nd_pfn->ndns;
1606 1607
		else if (nd_dax)
			ndns = nd_dax->nd_pfn.ndns;
1608

1609
		if (!ndns)
1610 1611 1612 1613 1614 1615 1616 1617 1618 1619
			return ERR_PTR(-ENODEV);

		/*
		 * Flush any in-progess probes / removals in the driver
		 * for the raw personality of this namespace.
		 */
		device_lock(&ndns->dev);
		device_unlock(&ndns->dev);
		if (ndns->dev.driver) {
			dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1620
					dev_name(dev));
1621 1622
			return ERR_PTR(-EBUSY);
		}
1623
		if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1624
					"host (%s) vs claim (%s) mismatch\n",
1625
					dev_name(dev),
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648
					dev_name(ndns->claim)))
			return ERR_PTR(-ENXIO);
	} else {
		ndns = to_ndns(dev);
		if (ndns->claim) {
			dev_dbg(dev, "claimed by %s, failing probe\n",
				dev_name(ndns->claim));

			return ERR_PTR(-ENXIO);
		}
	}

	size = nvdimm_namespace_capacity(ndns);
	if (size < ND_MIN_NAMESPACE_SIZE) {
		dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
				&size, ND_MIN_NAMESPACE_SIZE);
		return ERR_PTR(-ENODEV);
	}

	if (is_namespace_pmem(&ndns->dev)) {
		struct nd_namespace_pmem *nspm;

		nspm = to_nd_namespace_pmem(&ndns->dev);
1649
		if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1650 1651
			return ERR_PTR(-ENODEV);
	} else if (is_namespace_blk(&ndns->dev)) {
1652 1653 1654
		struct nd_namespace_blk *nsblk;

		nsblk = to_nd_namespace_blk(&ndns->dev);
1655 1656 1657 1658 1659 1660 1661
		if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
			return ERR_PTR(-ENODEV);
		if (!nsblk->lbasize) {
			dev_dbg(&ndns->dev, "%s: sector size not set\n",
				__func__);
			return ERR_PTR(-ENODEV);
		}
1662 1663
		if (!nd_namespace_blk_validate(nsblk))
			return ERR_PTR(-ENODEV);
1664 1665 1666 1667 1668 1669
	}

	return ndns;
}
EXPORT_SYMBOL(nvdimm_namespace_common_probe);

1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
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;
	}

1686
	dev = &nsio->common.dev;
1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698
	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;
}

1699 1700 1701 1702 1703 1704 1705 1706
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];
1707 1708
		struct nd_interleave_set *nd_set = nd_region->nd_set;
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1709
		struct nd_label_ent *label_ent;
1710 1711
		bool found_uuid = false;

1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
		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);
1722 1723 1724 1725 1726 1727 1728

			if (isetcookie != cookie)
				continue;

			if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
				continue;

1729 1730 1731 1732 1733 1734 1735 1736 1737
			if (namespace_label_has(ndd, type_guid)
					&& !guid_equal(&nd_set->type_guid,
						&nd_label->type_guid)) {
				dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
						nd_set->type_guid.b,
						nd_label->type_guid.b);
				continue;
			}

1738
			if (found_uuid) {
1739
				dev_dbg(ndd->dev,
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766
						"%s duplicate entry for uuid\n",
						__func__);
				return false;
			}
			found_uuid = true;
			if (nlabel != nd_region->ndr_mappings)
				continue;
			if (position != pos)
				continue;
			found = nd_label;
			break;
		}
		if (found)
			break;
	}
	return found != NULL;
}

static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
{
	int i;

	if (!pmem_id)
		return -ENODEV;

	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1767
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1768
		struct nd_namespace_label *nd_label = NULL;
1769
		u64 hw_start, hw_end, pmem_start, pmem_end;
1770
		struct nd_label_ent *label_ent;
1771

1772
		lockdep_assert_held(&nd_mapping->lock);
1773 1774 1775 1776
		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
			nd_label = label_ent->label;
			if (!nd_label)
				continue;
1777 1778
			if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
				break;
1779 1780
			nd_label = NULL;
		}
1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792

		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;
1793 1794
		pmem_start = __le64_to_cpu(nd_label->dpa);
		pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1795 1796
		if (pmem_start >= hw_start && pmem_start < hw_end
				&& pmem_end <= hw_end && pmem_end > hw_start)
1797
			/* pass */;
1798 1799 1800
		else {
			dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
					dev_name(ndd->dev), nd_label->uuid);
1801
			return -EINVAL;
1802
		}
1803

1804 1805
		/* move recently validated label to the front of the list */
		list_move(&label_ent->list, &nd_mapping->labels);
1806 1807 1808 1809 1810
	}
	return 0;
}

/**
1811
 * create_namespace_pmem - validate interleave set labelling, retrieve label0
1812
 * @nd_region: region with mappings to validate
1813 1814
 * @nspm: target namespace to create
 * @nd_label: target pmem namespace label to evaluate
1815
 */
1816
struct device *create_namespace_pmem(struct nd_region *nd_region,
1817
		struct nd_namespace_index *nsindex,
1818
		struct nd_namespace_label *nd_label)
1819
{
1820
	u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1821
	u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1822
	struct nd_label_ent *label_ent;
1823
	struct nd_namespace_pmem *nspm;
1824
	struct nd_mapping *nd_mapping;
1825
	resource_size_t size = 0;
1826 1827
	struct resource *res;
	struct device *dev;
1828
	int rc = 0;
1829 1830
	u16 i;

1831 1832
	if (cookie == 0) {
		dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1833
		return ERR_PTR(-ENXIO);
1834
	}
1835

1836 1837 1838
	if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
		dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
				nd_label->uuid);
1839 1840 1841 1842 1843
		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);
1844
	}
1845

1846 1847 1848
	nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
	if (!nspm)
		return ERR_PTR(-ENOMEM);
1849

1850
	nspm->id = -1;
1851 1852 1853 1854 1855 1856
	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;
1857

1858 1859 1860 1861 1862 1863 1864 1865
	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;
	}

1866
	if (i < nd_region->ndr_mappings) {
1867 1868
		struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);

1869 1870 1871 1872 1873
		/*
		 * 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.
		 */
1874 1875
		dev_err(&nd_region->dev, "%s missing label for %pUb\n",
				dev_name(ndd->dev), nd_label->uuid);
1876
		rc = -EINVAL;
1877
		goto err;
1878
	}
1879 1880 1881 1882 1883 1884 1885 1886 1887

	/*
	 * 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).
	 */
1888
	rc = select_pmem_id(nd_region, nd_label->uuid);
1889 1890 1891 1892 1893
	if (rc)
		goto err;

	/* Calculate total size and populate namespace properties from label0 */
	for (i = 0; i < nd_region->ndr_mappings; i++) {
1894
		struct nd_namespace_label *label0;
1895
		struct nvdimm_drvdata *ndd;
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905

		nd_mapping = &nd_region->mapping[i];
		label_ent = list_first_entry_or_null(&nd_mapping->labels,
				typeof(*label_ent), list);
		label0 = label_ent ? label_ent->label : 0;

		if (!label0) {
			WARN_ON(1);
			continue;
		}
1906 1907 1908 1909 1910 1911 1912 1913 1914

		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);
1915
		nspm->lbasize = __le64_to_cpu(label0->lbasize);
1916 1917 1918 1919 1920
		ndd = to_ndd(nd_mapping);
		if (namespace_label_has(ndd, abstraction_guid))
			nspm->nsio.common.claim_class
				= to_nvdimm_cclass(&label0->abstraction_guid);

1921 1922 1923 1924 1925 1926 1927
	}

	if (!nspm->alt_name || !nspm->uuid) {
		rc = -ENOMEM;
		goto err;
	}

1928
	nd_namespace_pmem_set_resource(nd_region, nspm, size);
1929

1930
	return dev;
1931
 err:
1932
	namespace_pmem_release(dev);
1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944
	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;
	}
1945
	return ERR_PTR(rc);
1946 1947
}

1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
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;

1983
	dev = &nsblk->common.dev;
1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
	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;

1994
	return &nsblk->common.dev;
1995 1996
}

1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
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_nd_pmem(&nd_region->dev))
		return NULL;

	nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
	if (!nspm)
		return NULL;

	dev = &nspm->nsio.common.dev;
	dev->type = &namespace_pmem_device_type;
	dev->parent = &nd_region->dev;
	res = &nspm->nsio.res;
	res->name = dev_name(&nd_region->dev);
	res->flags = IORESOURCE_MEM;

	nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
	if (nspm->id < 0) {
		kfree(nspm);
		return NULL;
	}
	dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
	dev->parent = &nd_region->dev;
	dev->groups = nd_namespace_attribute_groups;
	nd_namespace_pmem_set_resource(nd_region, nspm, 0);

	return dev;
}

void nd_region_create_ns_seed(struct nd_region *nd_region)
2031 2032
{
	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2033 2034 2035 2036 2037 2038 2039 2040 2041

	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);

2042 2043 2044 2045 2046
	/*
	 * Seed creation failures are not fatal, provisioning is simply
	 * disabled until memory becomes available
	 */
	if (!nd_region->ns_seed)
2047 2048
		dev_err(&nd_region->dev, "failed to create %s namespace\n",
				is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2049 2050 2051 2052
	else
		nd_device_register(nd_region->ns_seed);
}

2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064
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");
}

2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076
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");
}

2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088
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");
}

2089 2090 2091
static int add_namespace_resource(struct nd_region *nd_region,
		struct nd_namespace_label *nd_label, struct device **devs,
		int count)
2092
{
2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131
	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
	int i;

	for (i = 0; i < count; i++) {
		u8 *uuid = namespace_to_uuid(devs[i]);
		struct resource *res;

		if (IS_ERR_OR_NULL(uuid)) {
			WARN_ON(1);
			continue;
		}

		if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
			continue;
		if (is_namespace_blk(devs[i])) {
			res = nsblk_add_resource(nd_region, ndd,
					to_nd_namespace_blk(devs[i]),
					__le64_to_cpu(nd_label->dpa));
			if (!res)
				return -ENXIO;
			nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
		} else {
			dev_err(&nd_region->dev,
					"error: conflicting extents for uuid: %pUb\n",
					nd_label->uuid);
			return -ENXIO;
		}
		break;
	}

	return i;
}

struct device *create_namespace_blk(struct nd_region *nd_region,
		struct nd_namespace_label *nd_label, int count)
{

	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2132
	struct nd_interleave_set *nd_set = nd_region->nd_set;
2133
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2134
	struct nd_namespace_blk *nsblk;
2135
	char name[NSLABEL_NAME_LEN];
2136 2137 2138
	struct device *dev = NULL;
	struct resource *res;

2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152
	if (namespace_label_has(ndd, type_guid)) {
		if (!guid_equal(&nd_set->type_guid, &nd_label->type_guid)) {
			dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
					nd_set->type_guid.b,
					nd_label->type_guid.b);
			return ERR_PTR(-EAGAIN);
		}

		if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) {
			dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n",
					nd_set->cookie2,
					__le64_to_cpu(nd_label->isetcookie));
			return ERR_PTR(-EAGAIN);
		}
2153 2154
	}

2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
	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);
2165 2166 2167
	if (namespace_label_has(ndd, abstraction_guid))
		nsblk->common.claim_class
			= to_nvdimm_cclass(&nd_label->abstraction_guid);
2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184
	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);
	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);
}

2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
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));
}

2210 2211
static struct device **scan_labels(struct nd_region *nd_region)
{
2212
	int i, count = 0;
2213 2214
	struct device *dev, **devs = NULL;
	struct nd_label_ent *label_ent, *e;
2215 2216
	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
	resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2217

2218 2219
	/* "safe" because create_namespace_pmem() might list_move() label_ent */
	list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2220
		struct nd_namespace_label *nd_label = label_ent->label;
2221
		struct device **__devs;
2222
		u32 flags;
2223

2224 2225 2226
		if (!nd_label)
			continue;
		flags = __le32_to_cpu(nd_label->flags);
2227 2228 2229
		if (is_nd_blk(&nd_region->dev)
				== !!(flags & NSLABEL_FLAG_LOCAL))
			/* pass, region matches label type */;
2230 2231 2232
		else
			continue;

2233 2234 2235 2236
		/* skip labels that describe extents outside of the region */
		if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
			continue;

2237 2238 2239
		i = add_namespace_resource(nd_region, nd_label, devs, count);
		if (i < 0)
			goto err;
2240 2241 2242 2243 2244 2245 2246 2247 2248
		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;

2249
		if (is_nd_blk(&nd_region->dev))
2250
			dev = create_namespace_blk(nd_region, nd_label, count);
2251
		else {
2252 2253 2254 2255 2256
			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);
2257
		}
2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272

		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;

2273 2274
	}

2275 2276 2277
	dev_dbg(&nd_region->dev, "%s: discovered %d %s namespace%s\n",
			__func__, count, is_nd_blk(&nd_region->dev)
			? "blk" : "pmem", count == 1 ? "" : "s");
2278 2279 2280

	if (count == 0) {
		/* Publish a zero-sized namespace for userspace to configure. */
2281
		nd_mapping_free_labels(nd_mapping);
2282 2283 2284 2285

		devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
		if (!devs)
			goto err;
2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301
		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;
2302
			nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2303
		}
2304 2305
		dev->parent = &nd_region->dev;
		devs[count++] = dev;
2306 2307 2308
	} else if (is_nd_pmem(&nd_region->dev)) {
		/* clean unselected labels */
		for (i = 0; i < nd_region->ndr_mappings; i++) {
2309 2310 2311 2312
			struct list_head *l, *e;
			LIST_HEAD(list);
			int j;

2313 2314 2315 2316 2317
			nd_mapping = &nd_region->mapping[i];
			if (list_empty(&nd_mapping->labels)) {
				WARN_ON(1);
				continue;
			}
2318 2319 2320 2321 2322 2323 2324

			j = count;
			list_for_each_safe(l, e, &nd_mapping->labels) {
				if (!j--)
					break;
				list_move_tail(l, &list);
			}
2325
			nd_mapping_free_labels(nd_mapping);
2326
			list_splice_init(&list, &nd_mapping->labels);
2327
		}
2328 2329
	}

2330 2331 2332
	if (count > 1)
		sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);

2333 2334
	return devs;

2335
 err:
2336 2337 2338 2339 2340 2341 2342 2343
	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);
	}
2344 2345 2346
	return NULL;
}

2347
static struct device **create_namespaces(struct nd_region *nd_region)
2348 2349 2350
{
	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
	struct device **devs;
2351
	int i;
2352 2353 2354 2355

	if (nd_region->ndr_mappings == 0)
		return NULL;

2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
	/* 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);
	}
2370 2371 2372 2373

	return devs;
}

2374 2375 2376 2377 2378 2379 2380 2381
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;
2382
		struct nd_label_ent *label_ent;
2383 2384 2385
		int count, j;

		/*
2386 2387
		 * If the dimm is disabled then we may need to prevent
		 * the region from being activated.
2388 2389
		 */
		if (!ndd) {
2390 2391 2392 2393 2394
			if (test_bit(NDD_LOCKED, &nvdimm->flags))
				/* fail, label data may be unreadable */;
			else if (test_bit(NDD_ALIASING, &nvdimm->flags))
				/* fail, labels needed to disambiguate dpa */;
			else
2395
				return 0;
2396 2397 2398 2399 2400

			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");
2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413
			return -ENXIO;
		}
		nd_mapping->ndd = ndd;
		atomic_inc(&nvdimm->busy);
		get_ndd(ndd);

		count = nd_label_active_count(ndd);
		dev_dbg(ndd->dev, "%s: %d\n", __func__, count);
		if (!count)
			continue;
		for (j = 0; j < count; j++) {
			struct nd_namespace_label *label;

2414 2415 2416
			label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
			if (!label_ent)
				break;
2417
			label = nd_label_active(ndd, j);
2418 2419 2420 2421 2422
			label_ent->label = label;

			mutex_lock(&nd_mapping->lock);
			list_add_tail(&label_ent->list, &nd_mapping->labels);
			mutex_unlock(&nd_mapping->lock);
2423
		}
2424 2425 2426 2427 2428 2429 2430 2431

		if (j >= count)
			continue;

		mutex_lock(&nd_mapping->lock);
		nd_mapping_free_labels(nd_mapping);
		mutex_unlock(&nd_mapping->lock);
		return -ENOMEM;
2432 2433 2434 2435 2436
	}

	return 0;
}

2437 2438 2439
int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
{
	struct device **devs = NULL;
2440
	int i, rc = 0, type;
2441 2442

	*err = 0;
2443 2444 2445 2446 2447 2448 2449 2450 2451
	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) {
2452 2453 2454
	case ND_DEVICE_NAMESPACE_IO:
		devs = create_namespace_io(nd_region);
		break;
2455
	case ND_DEVICE_NAMESPACE_PMEM:
2456
	case ND_DEVICE_NAMESPACE_BLK:
2457
		devs = create_namespaces(nd_region);
2458
		break;
2459 2460 2461
	default:
		break;
	}
2462
	nvdimm_bus_unlock(&nd_region->dev);
2463 2464 2465 2466 2467 2468

	if (!devs)
		return -ENODEV;

	for (i = 0; devs[i]; i++) {
		struct device *dev = devs[i];
2469
		int id;
2470

2471 2472 2473 2474 2475 2476 2477
		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;
2478 2479 2480 2481 2482 2483 2484
		} 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;
2485 2486 2487 2488 2489 2490
		} else
			id = i;

		if (id < 0)
			break;
		dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2491 2492 2493
		dev->groups = nd_namespace_attribute_groups;
		nd_device_register(dev);
	}
2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513
	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;
	}
2514 2515
	kfree(devs);

2516 2517 2518
	if (rc == -ENODEV)
		return rc;

2519 2520
	return i;
}