namespace_devs.c 64.6 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/list.h>
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#include <linux/nd.h>
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#include "nd-core.h"
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#include "pmem.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)
{
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	if (is_nd_region(dev))
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		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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	return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
}
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) {
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			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)
660 661 662 663 664
				loc = ALLOC_BEFORE;
		}

		/* space between allocations */
		if (!loc && next) {
665 666 667 668 669 670
			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)
671 672 673 674 675
				loc = ALLOC_MID;
		}

		/* space at the end of the mapping */
		if (!loc && !next) {
676 677 678 679 680 681
			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)
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723
				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)
724
				valid.start += available - allocate;
725 726

			new_res = nvdimm_allocate_dpa(ndd, label_id,
727
					valid.start, allocate);
728 729 730 731 732 733
			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);
734 735
			if (rc == 0)
				res->flags |= DPA_RESOURCE_ADJUSTED;
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
		}

		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;
	}

761 762 763 764 765 766
	/*
	 * 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)
767 768 769 770
		return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
	return n;
}

771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808
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;

809
	if (!is_memory(dev))
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
		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;
}

863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
/**
 * 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)
{
879 880
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
	bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
881 882 883 884
	int i;

	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903
		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);
904

905 906 907 908 909 910 911 912 913 914 915 916 917
			/* 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);
918 919 920 921 922 923 924
		if (rc)
			return rc;
	}

	return 0;
}

925
static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
926 927 928
		struct nd_namespace_pmem *nspm, resource_size_t size)
{
	struct resource *res = &nspm->nsio.res;
929
	resource_size_t offset = 0;
930

931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
	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;
964 965
}

966 967 968 969 970 971 972 973 974
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;
}

975 976 977 978
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);
979
	struct nd_namespace_common *ndns = to_ndns(dev);
980 981 982 983
	struct nd_mapping *nd_mapping;
	struct nvdimm_drvdata *ndd;
	struct nd_label_id label_id;
	u32 flags = 0, remainder;
984
	int rc, i, id = -1;
985 986
	u8 *uuid = NULL;

987
	if (dev->driver || ndns->claim)
988 989 990 991 992 993
		return -EBUSY;

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

		uuid = nspm->uuid;
994
		id = nspm->id;
995
	} else if (is_namespace_blk(dev)) {
996 997 998 999
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		uuid = nsblk->uuid;
		flags = NSLABEL_FLAG_LOCAL;
1000
		id = nsblk->id;
1001 1002 1003 1004 1005 1006
	}

	/*
	 * We need a uuid for the allocation-label and dimm(s) on which
	 * to store the label.
	 */
1007
	if (uuid_not_set(uuid, dev, __func__))
1008
		return -ENXIO;
1009 1010 1011 1012
	if (nd_region->ndr_mappings == 0) {
		dev_dbg(dev, "%s: not associated with dimm(s)\n", __func__);
		return -ENXIO;
	}
1013 1014 1015 1016 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

	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);

1057
		nd_namespace_pmem_set_resource(nd_region, nspm,
1058 1059 1060
				val * nd_region->ndr_mappings);
	}

1061 1062
	/*
	 * Try to delete the namespace if we deleted all of its
1063 1064 1065
	 * 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.
1066
	 */
1067
	if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
1068 1069
		nd_device_unregister(dev, ND_ASYNC);

1070 1071 1072 1073 1074 1075
	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
1076
	struct nd_region *nd_region = to_nd_region(dev->parent);
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
	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
1089 1090
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
1091 1092 1093 1094 1095 1096

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

		uuid = &nspm->uuid;
	} else if (is_namespace_blk(dev)) {
1097 1098 1099
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		uuid = &nsblk->uuid;
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
	}

	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
1114
	return rc < 0 ? rc : len;
1115 1116
}

1117
resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1118
{
1119
	struct device *dev = &ndns->dev;
1120

1121 1122 1123
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

1124
		return resource_size(&nspm->nsio.res);
1125
	} else if (is_namespace_blk(dev)) {
1126
		return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1127 1128 1129
	} else if (is_namespace_io(dev)) {
		struct nd_namespace_io *nsio = to_nd_namespace_io(dev);

1130 1131 1132 1133 1134 1135 1136 1137 1138
		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;
1139

1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
	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)));
1153
}
1154
static DEVICE_ATTR(size, 0444, size_show, size_store);
1155

1156
static u8 *namespace_to_uuid(struct device *dev)
1157 1158 1159 1160
{
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

1161
		return nspm->uuid;
1162
	} else if (is_namespace_blk(dev)) {
1163 1164
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

1165
		return nsblk->uuid;
1166
	} else
1167 1168 1169 1170 1171 1172 1173
		return ERR_PTR(-ENXIO);
}

static ssize_t uuid_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	u8 *uuid = namespace_to_uuid(dev);
1174

1175 1176
	if (IS_ERR(uuid))
		return PTR_ERR(uuid);
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194
	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
1195
	int i;
1196

D
Dan Williams 已提交
1197 1198
	if (!nd_is_uuid_unique(dev, new_uuid))
		return -EINVAL;
1199 1200 1201 1202

	if (*old_uuid == NULL)
		goto out;

D
Dan Williams 已提交
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
	/*
	 * 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?
		 */
1219
		if (list_empty(&nd_mapping->labels))
D
Dan Williams 已提交
1220 1221 1222
			return -EBUSY;
	}

1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245
	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;
1246
	ssize_t rc = 0;
1247 1248 1249 1250 1251 1252 1253
	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)) {
1254 1255 1256
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		ns_uuid = &nsblk->uuid;
1257 1258 1259 1260 1261 1262
	} else
		return -ENXIO;

	device_lock(dev);
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
1263 1264 1265 1266
	if (to_ndns(dev)->claim)
		rc = -EBUSY;
	if (rc >= 0)
		rc = nd_uuid_store(dev, &uuid, buf, len);
1267 1268
	if (rc >= 0)
		rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
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1269 1270 1271 1272
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
	else
		kfree(uuid);
1273 1274 1275 1276 1277
	dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
			rc, buf, buf[len - 1] == '\n' ? "" : "\n");
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

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1278
	return rc < 0 ? rc : len;
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304
}
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);

1305
static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1306
	4096, 4104, 4160, 4224, 0 };
1307

1308 1309
static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };

1310 1311 1312
static ssize_t sector_size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
1313 1314
	if (is_namespace_blk(dev)) {
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1315

1316 1317 1318
		return nd_sector_size_show(nsblk->lbasize,
				blk_lbasize_supported, buf);
	}
1319

1320 1321 1322 1323 1324 1325 1326
	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;
1327 1328 1329 1330 1331
}

static ssize_t sector_size_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
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1332
	struct nd_region *nd_region = to_nd_region(dev->parent);
1333 1334
	const unsigned long *supported;
	unsigned long *lbasize;
1335
	ssize_t rc = 0;
1336

1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347
	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
1348 1349 1350 1351
		return -ENXIO;

	device_lock(dev);
	nvdimm_bus_lock(dev);
1352 1353 1354
	if (to_ndns(dev)->claim)
		rc = -EBUSY;
	if (rc >= 0)
1355
		rc = nd_sector_size_store(dev, buf, lbasize, supported);
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1356 1357 1358 1359 1360
	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");
1361 1362 1363 1364 1365 1366 1367
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

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

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1368 1369 1370 1371 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
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);

1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 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
static int btt_claim_class(struct device *dev)
{
	struct nd_region *nd_region = to_nd_region(dev->parent);
	int i, loop_bitmask = 0;

	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
		struct nd_namespace_index *nsindex;

		nsindex = to_namespace_index(ndd, ndd->ns_current);
		if (nsindex == NULL)
			loop_bitmask |= 1;
		else {
			/* check whether existing labels are v1.1 or v1.2 */
			if (__le16_to_cpu(nsindex->major) == 1
					&& __le16_to_cpu(nsindex->minor) == 1)
				loop_bitmask |= 2;
			else
				loop_bitmask |= 4;
		}
	}
	/*
	 * If nsindex is null loop_bitmask's bit 0 will be set, and if an index
	 * block is found, a v1.1 label for any mapping will set bit 1, and a
	 * v1.2 label will set bit 2.
	 *
	 * At the end of the loop, at most one of the three bits must be set.
	 * If multiple bits were set, it means the different mappings disagree
	 * about their labels, and this must be cleaned up first.
	 *
	 * If all the label index blocks are found to agree, nsindex of NULL
	 * implies labels haven't been initialized yet, and when they will,
	 * they will be of the 1.2 format, so we can assume BTT2.0
	 *
	 * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are
	 * found, we enforce BTT2.0
	 *
	 * If the loop was never entered, default to BTT1.1 (legacy namespaces)
	 */
	switch (loop_bitmask) {
	case 0:
	case 2:
		return NVDIMM_CCLASS_BTT;
	case 1:
	case 4:
		return NVDIMM_CCLASS_BTT2;
	default:
		return -ENXIO;
	}
}

1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
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);

1476 1477 1478 1479 1480 1481 1482 1483
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)
1484
		ndns->claim_class = btt_claim_class(dev);
1485 1486 1487 1488 1489 1490 1491 1492 1493
	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;

1494 1495 1496 1497
	/* btt_claim_class() could've returned an error */
	if (ndns->claim_class < 0)
		return ndns->claim_class;

1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528
	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");
1529 1530
	else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
			(ndns->claim_class == NVDIMM_CCLASS_BTT2))
1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
		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);

1544 1545 1546 1547 1548 1549 1550 1551 1552 1553
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;
1554
	if (claim && is_nd_btt(claim))
1555
		mode = "safe";
1556 1557
	else if (claim && is_nd_pfn(claim))
		mode = "memory";
1558 1559
	else if (claim && is_nd_dax(claim))
		mode = "dax";
1560 1561
	else if (!claim && pmem_should_map_pages(dev))
		mode = "memory";
1562 1563 1564 1565 1566 1567 1568 1569 1570
	else
		mode = "raw";
	rc = sprintf(buf, "%s\n", mode);
	device_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(mode);

1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
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);

1591 1592
static struct attribute *nd_namespace_attributes[] = {
	&dev_attr_nstype.attr,
1593
	&dev_attr_size.attr,
1594
	&dev_attr_mode.attr,
1595
	&dev_attr_uuid.attr,
1596
	&dev_attr_holder.attr,
1597 1598
	&dev_attr_resource.attr,
	&dev_attr_alt_name.attr,
1599
	&dev_attr_force_raw.attr,
1600
	&dev_attr_sector_size.attr,
D
Dan Williams 已提交
1601
	&dev_attr_dpa_extents.attr,
1602
	&dev_attr_holder_class.attr,
1603 1604 1605
	NULL,
};

1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
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)
1619
			return 0644;
1620

1621 1622 1623
		return a->mode;
	}

1624 1625
	if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
			|| a == &dev_attr_holder.attr
1626
			|| a == &dev_attr_holder_class.attr
1627 1628
			|| a == &dev_attr_force_raw.attr
			|| a == &dev_attr_mode.attr)
1629 1630 1631 1632 1633
		return a->mode;

	return 0;
}

1634 1635
static struct attribute_group nd_namespace_attribute_group = {
	.attrs = nd_namespace_attributes,
1636
	.is_visible = namespace_visible,
1637 1638 1639 1640 1641
};

static const struct attribute_group *nd_namespace_attribute_groups[] = {
	&nd_device_attribute_group,
	&nd_namespace_attribute_group,
1642
	&nd_numa_attribute_group,
1643 1644 1645
	NULL,
};

1646 1647 1648
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;
1649
	struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1650
	struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1651
	struct nd_namespace_common *ndns = NULL;
1652 1653
	resource_size_t size;

1654
	if (nd_btt || nd_pfn || nd_dax) {
1655
		if (nd_btt)
1656
			ndns = nd_btt->ndns;
1657
		else if (nd_pfn)
1658
			ndns = nd_pfn->ndns;
1659 1660
		else if (nd_dax)
			ndns = nd_dax->nd_pfn.ndns;
1661

1662
		if (!ndns)
1663 1664 1665 1666 1667 1668 1669 1670 1671 1672
			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",
1673
					dev_name(dev));
1674 1675
			return ERR_PTR(-EBUSY);
		}
1676
		if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1677
					"host (%s) vs claim (%s) mismatch\n",
1678
					dev_name(dev),
1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701
					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);
1702
		if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1703 1704
			return ERR_PTR(-ENODEV);
	} else if (is_namespace_blk(&ndns->dev)) {
1705 1706 1707
		struct nd_namespace_blk *nsblk;

		nsblk = to_nd_namespace_blk(&ndns->dev);
1708 1709 1710 1711 1712 1713 1714
		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);
		}
1715 1716
		if (!nd_namespace_blk_validate(nsblk))
			return ERR_PTR(-ENODEV);
1717 1718 1719 1720 1721 1722
	}

	return ndns;
}
EXPORT_SYMBOL(nvdimm_namespace_common_probe);

1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
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;
	}

1739
	dev = &nsio->common.dev;
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751
	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;
}

1752 1753 1754 1755 1756 1757 1758 1759
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];
1760 1761
		struct nd_interleave_set *nd_set = nd_region->nd_set;
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1762
		struct nd_label_ent *label_ent;
1763 1764
		bool found_uuid = false;

1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
		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);
1775 1776 1777 1778 1779 1780 1781

			if (isetcookie != cookie)
				continue;

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

1782 1783 1784 1785 1786 1787 1788 1789 1790
			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;
			}

1791
			if (found_uuid) {
1792
				dev_dbg(ndd->dev,
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819
						"%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];
1820
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1821
		struct nd_namespace_label *nd_label = NULL;
1822
		u64 hw_start, hw_end, pmem_start, pmem_end;
1823
		struct nd_label_ent *label_ent;
1824

1825
		lockdep_assert_held(&nd_mapping->lock);
1826 1827 1828 1829
		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
			nd_label = label_ent->label;
			if (!nd_label)
				continue;
1830 1831
			if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
				break;
1832 1833
			nd_label = NULL;
		}
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845

		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;
1846 1847
		pmem_start = __le64_to_cpu(nd_label->dpa);
		pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1848 1849
		if (pmem_start >= hw_start && pmem_start < hw_end
				&& pmem_end <= hw_end && pmem_end > hw_start)
1850
			/* pass */;
1851 1852 1853
		else {
			dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
					dev_name(ndd->dev), nd_label->uuid);
1854
			return -EINVAL;
1855
		}
1856

1857 1858
		/* move recently validated label to the front of the list */
		list_move(&label_ent->list, &nd_mapping->labels);
1859 1860 1861 1862 1863
	}
	return 0;
}

/**
1864
 * create_namespace_pmem - validate interleave set labelling, retrieve label0
1865
 * @nd_region: region with mappings to validate
1866 1867
 * @nspm: target namespace to create
 * @nd_label: target pmem namespace label to evaluate
1868
 */
1869
struct device *create_namespace_pmem(struct nd_region *nd_region,
1870
		struct nd_namespace_index *nsindex,
1871
		struct nd_namespace_label *nd_label)
1872
{
1873
	u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1874
	u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1875
	struct nd_label_ent *label_ent;
1876
	struct nd_namespace_pmem *nspm;
1877
	struct nd_mapping *nd_mapping;
1878
	resource_size_t size = 0;
1879 1880
	struct resource *res;
	struct device *dev;
1881
	int rc = 0;
1882 1883
	u16 i;

1884 1885
	if (cookie == 0) {
		dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1886
		return ERR_PTR(-ENXIO);
1887
	}
1888

1889 1890 1891
	if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
		dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
				nd_label->uuid);
1892 1893 1894 1895 1896
		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);
1897
	}
1898

1899 1900 1901
	nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
	if (!nspm)
		return ERR_PTR(-ENOMEM);
1902

1903
	nspm->id = -1;
1904 1905 1906 1907 1908 1909
	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;
1910

1911 1912 1913 1914 1915 1916 1917 1918
	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;
	}

1919
	if (i < nd_region->ndr_mappings) {
1920 1921
		struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);

1922 1923 1924 1925 1926
		/*
		 * 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.
		 */
1927 1928
		dev_err(&nd_region->dev, "%s missing label for %pUb\n",
				dev_name(ndd->dev), nd_label->uuid);
1929
		rc = -EINVAL;
1930
		goto err;
1931
	}
1932 1933 1934 1935 1936 1937 1938 1939 1940

	/*
	 * 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).
	 */
1941
	rc = select_pmem_id(nd_region, nd_label->uuid);
1942 1943 1944 1945 1946
	if (rc)
		goto err;

	/* Calculate total size and populate namespace properties from label0 */
	for (i = 0; i < nd_region->ndr_mappings; i++) {
1947
		struct nd_namespace_label *label0;
1948
		struct nvdimm_drvdata *ndd;
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958

		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;
		}
1959 1960 1961 1962 1963 1964 1965 1966 1967

		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);
1968
		nspm->lbasize = __le64_to_cpu(label0->lbasize);
1969 1970 1971 1972 1973
		ndd = to_ndd(nd_mapping);
		if (namespace_label_has(ndd, abstraction_guid))
			nspm->nsio.common.claim_class
				= to_nvdimm_cclass(&label0->abstraction_guid);

1974 1975 1976 1977 1978 1979 1980
	}

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

1981
	nd_namespace_pmem_set_resource(nd_region, nspm, size);
1982

1983
	return dev;
1984
 err:
1985
	namespace_pmem_release(dev);
1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997
	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;
	}
1998
	return ERR_PTR(rc);
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 2031 2032 2033 2034 2035
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;

2036
	dev = &nsblk->common.dev;
2037 2038 2039 2040 2041 2042 2043 2044 2045 2046
	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;

2047
	return &nsblk->common.dev;
2048 2049
}

2050 2051 2052 2053 2054 2055
static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
{
	struct nd_namespace_pmem *nspm;
	struct resource *res;
	struct device *dev;

2056
	if (!is_memory(&nd_region->dev))
2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083
		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)
2084 2085
{
	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2086 2087 2088 2089 2090 2091 2092 2093 2094

	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);

2095 2096 2097 2098 2099
	/*
	 * Seed creation failures are not fatal, provisioning is simply
	 * disabled until memory becomes available
	 */
	if (!nd_region->ns_seed)
2100 2101
		dev_err(&nd_region->dev, "failed to create %s namespace\n",
				is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2102 2103 2104 2105
	else
		nd_device_register(nd_region->ns_seed);
}

2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117
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");
}

2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129
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");
}

2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141
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");
}

2142 2143 2144
static int add_namespace_resource(struct nd_region *nd_region,
		struct nd_namespace_label *nd_label, struct device **devs,
		int count)
2145
{
2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184
	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];
2185
	struct nd_interleave_set *nd_set = nd_region->nd_set;
2186
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2187
	struct nd_namespace_blk *nsblk;
2188
	char name[NSLABEL_NAME_LEN];
2189 2190 2191
	struct device *dev = NULL;
	struct resource *res;

2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205
	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);
		}
2206 2207
	}

2208 2209 2210 2211 2212 2213 2214 2215 2216 2217
	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);
2218 2219 2220
	if (namespace_label_has(ndd, abstraction_guid))
		nsblk->common.claim_class
			= to_nvdimm_cclass(&nd_label->abstraction_guid);
2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237
	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);
}

2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262
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));
}

2263 2264
static struct device **scan_labels(struct nd_region *nd_region)
{
2265
	int i, count = 0;
2266 2267
	struct device *dev, **devs = NULL;
	struct nd_label_ent *label_ent, *e;
2268 2269
	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
	resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2270

2271 2272
	/* "safe" because create_namespace_pmem() might list_move() label_ent */
	list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2273
		struct nd_namespace_label *nd_label = label_ent->label;
2274
		struct device **__devs;
2275
		u32 flags;
2276

2277 2278 2279
		if (!nd_label)
			continue;
		flags = __le32_to_cpu(nd_label->flags);
2280 2281 2282
		if (is_nd_blk(&nd_region->dev)
				== !!(flags & NSLABEL_FLAG_LOCAL))
			/* pass, region matches label type */;
2283 2284 2285
		else
			continue;

2286 2287 2288 2289
		/* skip labels that describe extents outside of the region */
		if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
			continue;

2290 2291 2292
		i = add_namespace_resource(nd_region, nd_label, devs, count);
		if (i < 0)
			goto err;
2293 2294 2295 2296 2297 2298 2299 2300 2301
		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;

2302
		if (is_nd_blk(&nd_region->dev))
2303
			dev = create_namespace_blk(nd_region, nd_label, count);
2304
		else {
2305 2306 2307 2308 2309
			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);
2310
		}
2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325

		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;

2326 2327
	}

2328 2329 2330
	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");
2331 2332 2333

	if (count == 0) {
		/* Publish a zero-sized namespace for userspace to configure. */
2334
		nd_mapping_free_labels(nd_mapping);
2335 2336 2337 2338

		devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
		if (!devs)
			goto err;
2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354
		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;
2355
			nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2356
		}
2357 2358
		dev->parent = &nd_region->dev;
		devs[count++] = dev;
2359
	} else if (is_memory(&nd_region->dev)) {
2360 2361
		/* clean unselected labels */
		for (i = 0; i < nd_region->ndr_mappings; i++) {
2362 2363 2364 2365
			struct list_head *l, *e;
			LIST_HEAD(list);
			int j;

2366 2367 2368 2369 2370
			nd_mapping = &nd_region->mapping[i];
			if (list_empty(&nd_mapping->labels)) {
				WARN_ON(1);
				continue;
			}
2371 2372 2373 2374 2375 2376 2377

			j = count;
			list_for_each_safe(l, e, &nd_mapping->labels) {
				if (!j--)
					break;
				list_move_tail(l, &list);
			}
2378
			nd_mapping_free_labels(nd_mapping);
2379
			list_splice_init(&list, &nd_mapping->labels);
2380
		}
2381 2382
	}

2383 2384 2385
	if (count > 1)
		sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);

2386 2387
	return devs;

2388
 err:
2389 2390 2391 2392 2393 2394 2395 2396
	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);
	}
2397 2398 2399
	return NULL;
}

2400
static struct device **create_namespaces(struct nd_region *nd_region)
2401 2402 2403
{
	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
	struct device **devs;
2404
	int i;
2405 2406 2407 2408

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

2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422
	/* 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);
	}
2423 2424 2425 2426

	return devs;
}

2427 2428 2429 2430 2431 2432 2433 2434
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;
2435
		struct nd_label_ent *label_ent;
2436 2437 2438
		int count, j;

		/*
2439 2440
		 * If the dimm is disabled then we may need to prevent
		 * the region from being activated.
2441 2442
		 */
		if (!ndd) {
2443 2444 2445 2446 2447
			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
2448
				return 0;
2449 2450 2451 2452 2453

			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");
2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466
			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;

2467 2468 2469
			label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
			if (!label_ent)
				break;
2470
			label = nd_label_active(ndd, j);
2471 2472 2473 2474 2475
			label_ent->label = label;

			mutex_lock(&nd_mapping->lock);
			list_add_tail(&label_ent->list, &nd_mapping->labels);
			mutex_unlock(&nd_mapping->lock);
2476
		}
2477 2478 2479 2480 2481 2482 2483 2484

		if (j >= count)
			continue;

		mutex_lock(&nd_mapping->lock);
		nd_mapping_free_labels(nd_mapping);
		mutex_unlock(&nd_mapping->lock);
		return -ENOMEM;
2485 2486 2487 2488 2489
	}

	return 0;
}

2490 2491 2492
int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
{
	struct device **devs = NULL;
2493
	int i, rc = 0, type;
2494 2495

	*err = 0;
2496 2497 2498 2499 2500 2501 2502 2503 2504
	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) {
2505 2506 2507
	case ND_DEVICE_NAMESPACE_IO:
		devs = create_namespace_io(nd_region);
		break;
2508
	case ND_DEVICE_NAMESPACE_PMEM:
2509
	case ND_DEVICE_NAMESPACE_BLK:
2510
		devs = create_namespaces(nd_region);
2511
		break;
2512 2513 2514
	default:
		break;
	}
2515
	nvdimm_bus_unlock(&nd_region->dev);
2516 2517 2518 2519 2520 2521

	if (!devs)
		return -ENODEV;

	for (i = 0; devs[i]; i++) {
		struct device *dev = devs[i];
2522
		int id;
2523

2524 2525 2526 2527 2528 2529 2530
		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;
2531 2532 2533 2534 2535 2536 2537
		} 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;
2538 2539 2540 2541 2542 2543
		} else
			id = i;

		if (id < 0)
			break;
		dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2544 2545 2546
		dev->groups = nd_namespace_attribute_groups;
		nd_device_register(dev);
	}
2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566
	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;
	}
2567 2568
	kfree(devs);

2569 2570 2571
	if (rc == -ENODEV)
		return rc;

2572 2573
	return i;
}