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(%zd)\n", rc < 0 ? "fail " : "", rc);
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	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
	if (nd_region->ndr_mappings == 0) {
1010
		dev_dbg(dev, "not associated with dimm(s)\n");
1011 1012
		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
	}

	if (rc == 0 && val == 0 && uuid) {
		/* setting size zero == 'delete namespace' */
		kfree(*uuid);
		*uuid = NULL;
	}

1108
	dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
1109 1110 1111 1112

	nvdimm_bus_unlock(dev);
	device_unlock(dev);

D
Dan Williams 已提交
1113
	return rc < 0 ? rc : len;
1114 1115
}

1116
resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1117
{
1118
	struct device *dev = &ndns->dev;
1119

1120 1121 1122
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

1123
		return resource_size(&nspm->nsio.res);
1124
	} else if (is_namespace_blk(dev)) {
1125
		return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1126 1127 1128
	} else if (is_namespace_io(dev)) {
		struct nd_namespace_io *nsio = to_nd_namespace_io(dev);

1129 1130 1131 1132 1133 1134 1135 1136 1137
		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;
1138

1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
	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)));
1152
}
1153
static DEVICE_ATTR(size, 0444, size_show, size_store);
1154

1155
static u8 *namespace_to_uuid(struct device *dev)
1156 1157 1158 1159
{
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

1160
		return nspm->uuid;
1161
	} else if (is_namespace_blk(dev)) {
1162 1163
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

1164
		return nsblk->uuid;
1165
	} else
1166 1167 1168 1169 1170 1171 1172
		return ERR_PTR(-ENXIO);
}

static ssize_t uuid_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	u8 *uuid = namespace_to_uuid(dev);
1173

1174 1175
	if (IS_ERR(uuid))
		return PTR_ERR(uuid);
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
	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
1194
	int i;
1195

D
Dan Williams 已提交
1196 1197
	if (!nd_is_uuid_unique(dev, new_uuid))
		return -EINVAL;
1198 1199 1200 1201

	if (*old_uuid == NULL)
		goto out;

D
Dan Williams 已提交
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217
	/*
	 * 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?
		 */
1218
		if (list_empty(&nd_mapping->labels))
D
Dan Williams 已提交
1219 1220 1221
			return -EBUSY;
	}

1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
	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;
1245
	ssize_t rc = 0;
1246 1247 1248 1249 1250 1251 1252
	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)) {
1253 1254 1255
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		ns_uuid = &nsblk->uuid;
1256 1257 1258 1259 1260 1261
	} else
		return -ENXIO;

	device_lock(dev);
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
1262 1263 1264 1265
	if (to_ndns(dev)->claim)
		rc = -EBUSY;
	if (rc >= 0)
		rc = nd_uuid_store(dev, &uuid, buf, len);
1266 1267
	if (rc >= 0)
		rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
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1268 1269 1270 1271
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
	else
		kfree(uuid);
1272 1273
	dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
			buf[len - 1] == '\n' ? "" : "\n");
1274 1275 1276
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

D
Dan Williams 已提交
1277
	return rc < 0 ? rc : len;
1278 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
}
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);

1304
static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1305
	4096, 4104, 4160, 4224, 0 };
1306

1307 1308
static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };

1309 1310 1311
static ssize_t sector_size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
1312 1313
	if (is_namespace_blk(dev)) {
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1314

1315
		return nd_size_select_show(nsblk->lbasize,
1316 1317
				blk_lbasize_supported, buf);
	}
1318

1319 1320 1321
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

1322
		return nd_size_select_show(nspm->lbasize,
1323 1324 1325
				pmem_lbasize_supported, buf);
	}
	return -ENXIO;
1326 1327 1328 1329 1330
}

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
1331
	struct nd_region *nd_region = to_nd_region(dev->parent);
1332 1333
	const unsigned long *supported;
	unsigned long *lbasize;
1334
	ssize_t rc = 0;
1335

1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
	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
1347 1348 1349 1350
		return -ENXIO;

	device_lock(dev);
	nvdimm_bus_lock(dev);
1351 1352 1353
	if (to_ndns(dev)->claim)
		rc = -EBUSY;
	if (rc >= 0)
1354
		rc = nd_size_select_store(dev, buf, lbasize, supported);
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Dan Williams 已提交
1355 1356
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
1357 1358
	dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
			buf, buf[len - 1] == '\n' ? "" : "\n");
1359 1360 1361 1362 1363 1364 1365
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

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

D
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1366 1367 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
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);

1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
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;

1418 1419 1420 1421 1422 1423 1424 1425 1426
		/*
		 * If any of the DIMMs do not support labels the only
		 * possible BTT format is v1.
		 */
		if (!ndd) {
			loop_bitmask = 0;
			break;
		}

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 1462 1463 1464 1465 1466 1467 1468
		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;
	}
}

1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
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);

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)
1491
		ndns->claim_class = btt_claim_class(dev);
1492 1493 1494 1495 1496 1497 1498 1499 1500
	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;

1501 1502 1503 1504
	/* btt_claim_class() could've returned an error */
	if (ndns->claim_class < 0)
		return ndns->claim_class;

1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519
	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);
1520
	dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
	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");
1536 1537
	else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
			(ndns->claim_class == NVDIMM_CCLASS_BTT2))
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550
		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);

1551 1552 1553 1554 1555 1556 1557 1558 1559 1560
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;
1561
	if (claim && is_nd_btt(claim))
1562
		mode = "safe";
1563 1564
	else if (claim && is_nd_pfn(claim))
		mode = "memory";
1565 1566
	else if (claim && is_nd_dax(claim))
		mode = "dax";
1567 1568
	else if (!claim && pmem_should_map_pages(dev))
		mode = "memory";
1569 1570 1571 1572 1573 1574 1575 1576 1577
	else
		mode = "raw";
	rc = sprintf(buf, "%s\n", mode);
	device_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(mode);

1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
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);

1598 1599
static struct attribute *nd_namespace_attributes[] = {
	&dev_attr_nstype.attr,
1600
	&dev_attr_size.attr,
1601
	&dev_attr_mode.attr,
1602
	&dev_attr_uuid.attr,
1603
	&dev_attr_holder.attr,
1604 1605
	&dev_attr_resource.attr,
	&dev_attr_alt_name.attr,
1606
	&dev_attr_force_raw.attr,
1607
	&dev_attr_sector_size.attr,
D
Dan Williams 已提交
1608
	&dev_attr_dpa_extents.attr,
1609
	&dev_attr_holder_class.attr,
1610 1611 1612
	NULL,
};

1613 1614 1615 1616 1617 1618 1619 1620
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;
1621
		return 0400;
1622 1623 1624 1625
	}

	if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
		if (a == &dev_attr_size.attr)
1626
			return 0644;
1627

1628 1629 1630
		return a->mode;
	}

1631 1632
	if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
			|| a == &dev_attr_holder.attr
1633
			|| a == &dev_attr_holder_class.attr
1634 1635
			|| a == &dev_attr_force_raw.attr
			|| a == &dev_attr_mode.attr)
1636 1637 1638 1639 1640
		return a->mode;

	return 0;
}

1641 1642
static struct attribute_group nd_namespace_attribute_group = {
	.attrs = nd_namespace_attributes,
1643
	.is_visible = namespace_visible,
1644 1645 1646 1647 1648
};

static const struct attribute_group *nd_namespace_attribute_groups[] = {
	&nd_device_attribute_group,
	&nd_namespace_attribute_group,
1649
	&nd_numa_attribute_group,
1650 1651 1652
	NULL,
};

1653 1654 1655
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;
1656
	struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1657
	struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1658
	struct nd_namespace_common *ndns = NULL;
1659 1660
	resource_size_t size;

1661
	if (nd_btt || nd_pfn || nd_dax) {
1662
		if (nd_btt)
1663
			ndns = nd_btt->ndns;
1664
		else if (nd_pfn)
1665
			ndns = nd_pfn->ndns;
1666 1667
		else if (nd_dax)
			ndns = nd_dax->nd_pfn.ndns;
1668

1669
		if (!ndns)
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
			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",
1680
					dev_name(dev));
1681 1682
			return ERR_PTR(-EBUSY);
		}
1683
		if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1684
					"host (%s) vs claim (%s) mismatch\n",
1685
					dev_name(dev),
1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
					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);
1709
		if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1710 1711
			return ERR_PTR(-ENODEV);
	} else if (is_namespace_blk(&ndns->dev)) {
1712 1713 1714
		struct nd_namespace_blk *nsblk;

		nsblk = to_nd_namespace_blk(&ndns->dev);
1715 1716 1717
		if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
			return ERR_PTR(-ENODEV);
		if (!nsblk->lbasize) {
1718
			dev_dbg(&ndns->dev, "sector size not set\n");
1719 1720
			return ERR_PTR(-ENODEV);
		}
1721 1722
		if (!nd_namespace_blk_validate(nsblk))
			return ERR_PTR(-ENODEV);
1723 1724 1725 1726 1727 1728
	}

	return ndns;
}
EXPORT_SYMBOL(nvdimm_namespace_common_probe);

1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
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;
	}

1745
	dev = &nsio->common.dev;
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757
	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;
}

1758 1759 1760 1761 1762 1763 1764 1765
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];
1766 1767
		struct nd_interleave_set *nd_set = nd_region->nd_set;
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1768
		struct nd_label_ent *label_ent;
1769 1770
		bool found_uuid = false;

1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
		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);
1781 1782 1783 1784 1785 1786 1787

			if (isetcookie != cookie)
				continue;

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

1788 1789 1790 1791 1792 1793 1794 1795 1796
			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;
			}

1797
			if (found_uuid) {
1798
				dev_dbg(ndd->dev, "duplicate entry for uuid\n");
1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823
				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];
1824
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1825
		struct nd_namespace_label *nd_label = NULL;
1826
		u64 hw_start, hw_end, pmem_start, pmem_end;
1827
		struct nd_label_ent *label_ent;
1828

1829
		lockdep_assert_held(&nd_mapping->lock);
1830 1831 1832 1833
		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
			nd_label = label_ent->label;
			if (!nd_label)
				continue;
1834 1835
			if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
				break;
1836 1837
			nd_label = NULL;
		}
1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849

		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;
1850 1851
		pmem_start = __le64_to_cpu(nd_label->dpa);
		pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1852 1853
		if (pmem_start >= hw_start && pmem_start < hw_end
				&& pmem_end <= hw_end && pmem_end > hw_start)
1854
			/* pass */;
1855 1856 1857
		else {
			dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
					dev_name(ndd->dev), nd_label->uuid);
1858
			return -EINVAL;
1859
		}
1860

1861 1862
		/* move recently validated label to the front of the list */
		list_move(&label_ent->list, &nd_mapping->labels);
1863 1864 1865 1866 1867
	}
	return 0;
}

/**
1868
 * create_namespace_pmem - validate interleave set labelling, retrieve label0
1869
 * @nd_region: region with mappings to validate
1870 1871
 * @nspm: target namespace to create
 * @nd_label: target pmem namespace label to evaluate
1872
 */
1873
static struct device *create_namespace_pmem(struct nd_region *nd_region,
1874
		struct nd_namespace_index *nsindex,
1875
		struct nd_namespace_label *nd_label)
1876
{
1877
	u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1878
	u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1879
	struct nd_label_ent *label_ent;
1880
	struct nd_namespace_pmem *nspm;
1881
	struct nd_mapping *nd_mapping;
1882
	resource_size_t size = 0;
1883 1884
	struct resource *res;
	struct device *dev;
1885
	int rc = 0;
1886 1887
	u16 i;

1888 1889
	if (cookie == 0) {
		dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1890
		return ERR_PTR(-ENXIO);
1891
	}
1892

1893 1894 1895
	if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
		dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
				nd_label->uuid);
1896 1897 1898 1899 1900
		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);
1901
	}
1902

1903 1904 1905
	nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
	if (!nspm)
		return ERR_PTR(-ENOMEM);
1906

1907
	nspm->id = -1;
1908 1909 1910 1911 1912 1913
	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;
1914

1915 1916 1917 1918 1919 1920 1921 1922
	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;
	}

1923
	if (i < nd_region->ndr_mappings) {
1924 1925
		struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);

1926 1927 1928 1929 1930
		/*
		 * 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.
		 */
1931 1932
		dev_err(&nd_region->dev, "%s missing label for %pUb\n",
				dev_name(ndd->dev), nd_label->uuid);
1933
		rc = -EINVAL;
1934
		goto err;
1935
	}
1936 1937 1938 1939 1940 1941 1942 1943 1944

	/*
	 * 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).
	 */
1945
	rc = select_pmem_id(nd_region, nd_label->uuid);
1946 1947 1948 1949 1950
	if (rc)
		goto err;

	/* Calculate total size and populate namespace properties from label0 */
	for (i = 0; i < nd_region->ndr_mappings; i++) {
1951
		struct nd_namespace_label *label0;
1952
		struct nvdimm_drvdata *ndd;
1953 1954 1955 1956 1957 1958 1959 1960 1961 1962

		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;
		}
1963 1964 1965 1966 1967 1968 1969 1970 1971

		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);
1972
		nspm->lbasize = __le64_to_cpu(label0->lbasize);
1973 1974 1975 1976 1977
		ndd = to_ndd(nd_mapping);
		if (namespace_label_has(ndd, abstraction_guid))
			nspm->nsio.common.claim_class
				= to_nvdimm_cclass(&label0->abstraction_guid);

1978 1979 1980 1981 1982 1983 1984
	}

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

1985
	nd_namespace_pmem_set_resource(nd_region, nspm, size);
1986

1987
	return dev;
1988
 err:
1989
	namespace_pmem_release(dev);
1990 1991
	switch (rc) {
	case -EINVAL:
1992
		dev_dbg(&nd_region->dev, "invalid label(s)\n");
1993 1994
		break;
	case -ENODEV:
1995
		dev_dbg(&nd_region->dev, "label not found\n");
1996 1997
		break;
	default:
1998
		dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
1999 2000
		break;
	}
2001
	return ERR_PTR(rc);
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 2036 2037 2038
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;

2039
	dev = &nsblk->common.dev;
2040 2041 2042 2043 2044 2045 2046 2047 2048 2049
	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;

2050
	return &nsblk->common.dev;
2051 2052
}

2053 2054 2055 2056 2057 2058
static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
{
	struct nd_namespace_pmem *nspm;
	struct resource *res;
	struct device *dev;

2059
	if (!is_memory(&nd_region->dev))
2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086
		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)
2087 2088
{
	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2089 2090 2091 2092 2093 2094 2095 2096 2097

	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);

2098 2099 2100 2101 2102
	/*
	 * Seed creation failures are not fatal, provisioning is simply
	 * disabled until memory becomes available
	 */
	if (!nd_region->ns_seed)
2103 2104
		dev_err(&nd_region->dev, "failed to create %s namespace\n",
				is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2105 2106 2107 2108
	else
		nd_device_register(nd_region->ns_seed);
}

2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
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");
}

2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
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");
}

2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144
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");
}

2145 2146 2147
static int add_namespace_resource(struct nd_region *nd_region,
		struct nd_namespace_label *nd_label, struct device **devs,
		int count)
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
	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;
}

2183
static struct device *create_namespace_blk(struct nd_region *nd_region,
2184 2185 2186 2187
		struct nd_namespace_label *nd_label, int count)
{

	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2188
	struct nd_interleave_set *nd_set = nd_region->nd_set;
2189
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2190
	struct nd_namespace_blk *nsblk;
2191
	char name[NSLABEL_NAME_LEN];
2192 2193 2194
	struct device *dev = NULL;
	struct resource *res;

2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208
	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);
		}
2209 2210
	}

2211 2212 2213 2214 2215 2216 2217 2218 2219 2220
	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);
2221 2222 2223
	if (namespace_label_has(ndd, abstraction_guid))
		nsblk->common.claim_class
			= to_nvdimm_cclass(&nd_label->abstraction_guid);
2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240
	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);
}

2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265
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));
}

2266 2267
static struct device **scan_labels(struct nd_region *nd_region)
{
2268
	int i, count = 0;
2269 2270
	struct device *dev, **devs = NULL;
	struct nd_label_ent *label_ent, *e;
2271 2272
	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
	resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2273

2274 2275
	/* "safe" because create_namespace_pmem() might list_move() label_ent */
	list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2276
		struct nd_namespace_label *nd_label = label_ent->label;
2277
		struct device **__devs;
2278
		u32 flags;
2279

2280 2281 2282
		if (!nd_label)
			continue;
		flags = __le32_to_cpu(nd_label->flags);
2283 2284 2285
		if (is_nd_blk(&nd_region->dev)
				== !!(flags & NSLABEL_FLAG_LOCAL))
			/* pass, region matches label type */;
2286 2287 2288
		else
			continue;

2289 2290 2291 2292
		/* skip labels that describe extents outside of the region */
		if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
			continue;

2293 2294 2295
		i = add_namespace_resource(nd_region, nd_label, devs, count);
		if (i < 0)
			goto err;
2296 2297 2298 2299 2300 2301 2302 2303 2304
		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;

2305
		if (is_nd_blk(&nd_region->dev))
2306
			dev = create_namespace_blk(nd_region, nd_label, count);
2307
		else {
2308 2309 2310 2311 2312
			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);
2313
		}
2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328

		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;

2329 2330
	}

2331 2332
	dev_dbg(&nd_region->dev, "discovered %d %s namespace%s\n",
			count, is_nd_blk(&nd_region->dev)
2333
			? "blk" : "pmem", count == 1 ? "" : "s");
2334 2335 2336

	if (count == 0) {
		/* Publish a zero-sized namespace for userspace to configure. */
2337
		nd_mapping_free_labels(nd_mapping);
2338 2339 2340 2341

		devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
		if (!devs)
			goto err;
2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357
		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;
2358
			nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2359
		}
2360 2361
		dev->parent = &nd_region->dev;
		devs[count++] = dev;
2362
	} else if (is_memory(&nd_region->dev)) {
2363 2364
		/* clean unselected labels */
		for (i = 0; i < nd_region->ndr_mappings; i++) {
2365 2366 2367 2368
			struct list_head *l, *e;
			LIST_HEAD(list);
			int j;

2369 2370 2371 2372 2373
			nd_mapping = &nd_region->mapping[i];
			if (list_empty(&nd_mapping->labels)) {
				WARN_ON(1);
				continue;
			}
2374 2375 2376 2377 2378 2379 2380

			j = count;
			list_for_each_safe(l, e, &nd_mapping->labels) {
				if (!j--)
					break;
				list_move_tail(l, &list);
			}
2381
			nd_mapping_free_labels(nd_mapping);
2382
			list_splice_init(&list, &nd_mapping->labels);
2383
		}
2384 2385
	}

2386 2387 2388
	if (count > 1)
		sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);

2389 2390
	return devs;

2391
 err:
2392 2393 2394 2395 2396 2397 2398 2399
	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);
	}
2400 2401 2402
	return NULL;
}

2403
static struct device **create_namespaces(struct nd_region *nd_region)
2404
{
2405
	struct nd_mapping *nd_mapping;
2406
	struct device **devs;
2407
	int i;
2408 2409 2410 2411

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

2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425
	/* 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);
	}
2426 2427 2428 2429

	return devs;
}

2430 2431 2432 2433 2434 2435 2436 2437
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;
2438
		struct nd_label_ent *label_ent;
2439 2440 2441
		int count, j;

		/*
2442 2443
		 * If the dimm is disabled then we may need to prevent
		 * the region from being activated.
2444 2445
		 */
		if (!ndd) {
2446 2447 2448 2449 2450
			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
2451
				return 0;
2452 2453 2454 2455 2456

			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");
2457 2458 2459 2460 2461 2462 2463
			return -ENXIO;
		}
		nd_mapping->ndd = ndd;
		atomic_inc(&nvdimm->busy);
		get_ndd(ndd);

		count = nd_label_active_count(ndd);
2464
		dev_dbg(ndd->dev, "count: %d\n", count);
2465 2466 2467 2468 2469
		if (!count)
			continue;
		for (j = 0; j < count; j++) {
			struct nd_namespace_label *label;

2470 2471 2472
			label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
			if (!label_ent)
				break;
2473
			label = nd_label_active(ndd, j);
2474 2475 2476 2477 2478
			label_ent->label = label;

			mutex_lock(&nd_mapping->lock);
			list_add_tail(&label_ent->list, &nd_mapping->labels);
			mutex_unlock(&nd_mapping->lock);
2479
		}
2480 2481 2482 2483 2484 2485 2486 2487

		if (j >= count)
			continue;

		mutex_lock(&nd_mapping->lock);
		nd_mapping_free_labels(nd_mapping);
		mutex_unlock(&nd_mapping->lock);
		return -ENOMEM;
2488 2489 2490 2491 2492
	}

	return 0;
}

2493 2494 2495
int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
{
	struct device **devs = NULL;
2496
	int i, rc = 0, type;
2497 2498

	*err = 0;
2499 2500 2501 2502 2503 2504 2505 2506 2507
	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) {
2508 2509 2510
	case ND_DEVICE_NAMESPACE_IO:
		devs = create_namespace_io(nd_region);
		break;
2511
	case ND_DEVICE_NAMESPACE_PMEM:
2512
	case ND_DEVICE_NAMESPACE_BLK:
2513
		devs = create_namespaces(nd_region);
2514
		break;
2515 2516 2517
	default:
		break;
	}
2518
	nvdimm_bus_unlock(&nd_region->dev);
2519 2520 2521 2522 2523 2524

	if (!devs)
		return -ENODEV;

	for (i = 0; devs[i]; i++) {
		struct device *dev = devs[i];
2525
		int id;
2526

2527 2528 2529 2530 2531 2532 2533
		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;
2534 2535 2536 2537 2538 2539 2540
		} 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;
2541 2542 2543 2544 2545 2546
		} else
			id = i;

		if (id < 0)
			break;
		dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2547 2548 2549
		dev->groups = nd_namespace_attribute_groups;
		nd_device_register(dev);
	}
2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569
	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;
	}
2570 2571
	kfree(devs);

2572 2573 2574
	if (rc == -ENODEV)
		return rc;

2575 2576
	return i;
}