namespace_devs.c 58.3 KB
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/*
 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */
#include <linux/module.h>
#include <linux/device.h>
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#include <linux/sort.h>
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#include <linux/slab.h>
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#include <linux/pmem.h>
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#include <linux/list.h>
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#include <linux/nd.h>
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#include "nd-core.h"
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#include "nd.h"

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

	kfree(nsio);
}

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

static void namespace_blk_release(struct device *dev)
{
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	struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
	struct nd_region *nd_region = to_nd_region(dev->parent);

	if (nsblk->id >= 0)
		ida_simple_remove(&nd_region->ns_ida, nsblk->id);
	kfree(nsblk->alt_name);
	kfree(nsblk->uuid);
	kfree(nsblk->res);
	kfree(nsblk);
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}

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

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

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

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

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

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

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static int is_uuid_busy(struct device *dev, void *data)
{
	u8 *uuid1 = data, *uuid2 = NULL;

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

		uuid2 = nspm->uuid;
	} else if (is_namespace_blk(dev)) {
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		uuid2 = nsblk->uuid;
	} else if (is_nd_btt(dev)) {
		struct nd_btt *nd_btt = to_nd_btt(dev);

		uuid2 = nd_btt->uuid;
	} else if (is_nd_pfn(dev)) {
		struct nd_pfn *nd_pfn = to_nd_pfn(dev);

		uuid2 = nd_pfn->uuid;
	}

	if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
		return -EBUSY;

	return 0;
}

static int is_namespace_uuid_busy(struct device *dev, void *data)
{
	if (is_nd_pmem(dev) || is_nd_blk(dev))
		return device_for_each_child(dev, data, is_uuid_busy);
	return 0;
}

/**
 * nd_is_uuid_unique - verify that no other namespace has @uuid
 * @dev: any device on a nvdimm_bus
 * @uuid: uuid to check
 */
bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
{
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

	if (!nvdimm_bus)
		return false;
	WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
	if (device_for_each_child(&nvdimm_bus->dev, uuid,
				is_namespace_uuid_busy) != 0)
		return false;
	return true;
}

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bool pmem_should_map_pages(struct device *dev)
{
	struct nd_region *nd_region = to_nd_region(dev->parent);
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	struct nd_namespace_io *nsio;
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	if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
		return false;

	if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
		return false;

	if (is_nd_pfn(dev) || is_nd_btt(dev))
		return false;

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	nsio = to_nd_namespace_io(dev);
	if (region_intersects(nsio->res.start, resource_size(&nsio->res),
				IORESOURCE_SYSTEM_RAM,
				IORES_DESC_NONE) == REGION_MIXED)
		return false;

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

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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)
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				loc = ALLOC_BEFORE;
		}

		/* space between allocations */
		if (!loc && next) {
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			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)
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				loc = ALLOC_MID;
		}

		/* space at the end of the mapping */
		if (!loc && !next) {
657 658 659 660 661 662
			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)
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
				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)
705
				valid.start += available - allocate;
706 707

			new_res = nvdimm_allocate_dpa(ndd, label_id,
708
					valid.start, allocate);
709 710 711 712 713 714
			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);
715 716
			if (rc == 0)
				res->flags |= DPA_RESOURCE_ADJUSTED;
717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
		}

		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;
	}

742 743 744 745 746 747
	/*
	 * 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)
748 749 750 751
		return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
	return n;
}

752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843
static int merge_dpa(struct nd_region *nd_region,
		struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
{
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
	struct resource *res;

	if (strncmp("pmem", label_id->id, 4) == 0)
		return 0;
 retry:
	for_each_dpa_resource(ndd, res) {
		int rc;
		struct resource *next = res->sibling;
		resource_size_t end = res->start + resource_size(res);

		if (!next || strcmp(res->name, label_id->id) != 0
				|| strcmp(next->name, label_id->id) != 0
				|| end != next->start)
			continue;
		end += resource_size(next);
		nvdimm_free_dpa(ndd, next);
		rc = adjust_resource(res, res->start, end - res->start);
		nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
		if (rc)
			return rc;
		res->flags |= DPA_RESOURCE_ADJUSTED;
		goto retry;
	}

	return 0;
}

static int __reserve_free_pmem(struct device *dev, void *data)
{
	struct nvdimm *nvdimm = data;
	struct nd_region *nd_region;
	struct nd_label_id label_id;
	int i;

	if (!is_nd_pmem(dev))
		return 0;

	nd_region = to_nd_region(dev);
	if (nd_region->ndr_mappings == 0)
		return 0;

	memset(&label_id, 0, sizeof(label_id));
	strcat(label_id.id, "pmem-reserve");
	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
		resource_size_t n, rem = 0;

		if (nd_mapping->nvdimm != nvdimm)
			continue;

		n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
		if (n == 0)
			return 0;
		rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
		dev_WARN_ONCE(&nd_region->dev, rem,
				"pmem reserve underrun: %#llx of %#llx bytes\n",
				(unsigned long long) n - rem,
				(unsigned long long) n);
		return rem ? -ENXIO : 0;
	}

	return 0;
}

static void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
		struct nd_mapping *nd_mapping)
{
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
	struct resource *res, *_res;

	for_each_dpa_resource_safe(ndd, res, _res)
		if (strcmp(res->name, "pmem-reserve") == 0)
			nvdimm_free_dpa(ndd, res);
}

static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
		struct nd_mapping *nd_mapping)
{
	struct nvdimm *nvdimm = nd_mapping->nvdimm;
	int rc;

	rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
			__reserve_free_pmem);
	if (rc)
		release_free_pmem(nvdimm_bus, nd_mapping);
	return rc;
}

844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
/**
 * 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)
{
860 861
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
	bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
862 863 864 865
	int i;

	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884
		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);
885

886 887 888 889 890 891 892 893 894 895 896 897 898
			/* 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);
899 900 901 902 903 904 905
		if (rc)
			return rc;
	}

	return 0;
}

906
static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
907 908 909
		struct nd_namespace_pmem *nspm, resource_size_t size)
{
	struct resource *res = &nspm->nsio.res;
910
	resource_size_t offset = 0;
911

912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944
	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;
945 946
}

947 948 949 950 951 952 953 954 955
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;
}

956 957 958 959
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);
960
	struct nd_namespace_common *ndns = to_ndns(dev);
961 962 963 964 965 966 967
	struct nd_mapping *nd_mapping;
	struct nvdimm_drvdata *ndd;
	struct nd_label_id label_id;
	u32 flags = 0, remainder;
	u8 *uuid = NULL;
	int rc, i;

968
	if (dev->driver || ndns->claim)
969 970 971 972 973 974 975
		return -EBUSY;

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

		uuid = nspm->uuid;
	} else if (is_namespace_blk(dev)) {
976 977 978 979
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		uuid = nsblk->uuid;
		flags = NSLABEL_FLAG_LOCAL;
980 981 982 983 984 985
	}

	/*
	 * We need a uuid for the allocation-label and dimm(s) on which
	 * to store the label.
	 */
986
	if (uuid_not_set(uuid, dev, __func__))
987
		return -ENXIO;
988 989 990 991
	if (nd_region->ndr_mappings == 0) {
		dev_dbg(dev, "%s: not associated with dimm(s)\n", __func__);
		return -ENXIO;
	}
992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035

	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);

1036
		nd_namespace_pmem_set_resource(nd_region, nspm,
1037 1038 1039
				val * nd_region->ndr_mappings);
	}

1040 1041 1042 1043 1044 1045 1046 1047
	/*
	 * Try to delete the namespace if we deleted all of its
	 * allocation, this is not the seed device for the region, and
	 * it is not actively claimed by a btt instance.
	 */
	if (val == 0 && nd_region->ns_seed != dev && !ndns->claim)
		nd_device_unregister(dev, ND_ASYNC);

1048 1049 1050 1051 1052 1053
	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
1054
	struct nd_region *nd_region = to_nd_region(dev->parent);
1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
	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
1067 1068
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
1069 1070 1071 1072 1073 1074

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

		uuid = &nspm->uuid;
	} else if (is_namespace_blk(dev)) {
1075 1076 1077
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		uuid = &nsblk->uuid;
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
	}

	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
1092
	return rc < 0 ? rc : len;
1093 1094
}

1095
resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1096
{
1097
	struct device *dev = &ndns->dev;
1098

1099 1100 1101
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

1102
		return resource_size(&nspm->nsio.res);
1103
	} else if (is_namespace_blk(dev)) {
1104
		return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1105 1106 1107
	} else if (is_namespace_io(dev)) {
		struct nd_namespace_io *nsio = to_nd_namespace_io(dev);

1108 1109 1110 1111 1112 1113 1114 1115 1116
		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;
1117

1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
	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)));
1131
}
1132
static DEVICE_ATTR(size, 0444, size_show, size_store);
1133

1134
static u8 *namespace_to_uuid(struct device *dev)
1135 1136 1137 1138
{
	if (is_namespace_pmem(dev)) {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

1139
		return nspm->uuid;
1140
	} else if (is_namespace_blk(dev)) {
1141 1142
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

1143
		return nsblk->uuid;
1144
	} else
1145 1146 1147 1148 1149 1150 1151
		return ERR_PTR(-ENXIO);
}

static ssize_t uuid_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	u8 *uuid = namespace_to_uuid(dev);
1152

1153 1154
	if (IS_ERR(uuid))
		return PTR_ERR(uuid);
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
	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
1173
	int i;
1174

D
Dan Williams 已提交
1175 1176
	if (!nd_is_uuid_unique(dev, new_uuid))
		return -EINVAL;
1177 1178 1179 1180

	if (*old_uuid == NULL)
		goto out;

D
Dan Williams 已提交
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
	/*
	 * 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?
		 */
1197
		if (list_empty(&nd_mapping->labels))
D
Dan Williams 已提交
1198 1199 1200
			return -EBUSY;
	}

1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
	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;
1224
	ssize_t rc = 0;
1225 1226 1227 1228 1229 1230 1231
	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)) {
1232 1233 1234
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		ns_uuid = &nsblk->uuid;
1235 1236 1237 1238 1239 1240
	} else
		return -ENXIO;

	device_lock(dev);
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
1241 1242 1243 1244
	if (to_ndns(dev)->claim)
		rc = -EBUSY;
	if (rc >= 0)
		rc = nd_uuid_store(dev, &uuid, buf, len);
1245 1246
	if (rc >= 0)
		rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
D
Dan Williams 已提交
1247 1248 1249 1250
	if (rc >= 0)
		rc = nd_namespace_label_update(nd_region, dev);
	else
		kfree(uuid);
1251 1252 1253 1254 1255
	dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
			rc, buf, buf[len - 1] == '\n' ? "" : "\n");
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

D
Dan Williams 已提交
1256
	return rc < 0 ? rc : len;
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
}
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);

1283 1284
static const unsigned long ns_lbasize_supported[] = { 512, 520, 528,
	4096, 4104, 4160, 4224, 0 };
1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300

static ssize_t sector_size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

	if (!is_namespace_blk(dev))
		return -ENXIO;

	return nd_sector_size_show(nsblk->lbasize, ns_lbasize_supported, buf);
}

static ssize_t sector_size_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
	struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
D
Dan Williams 已提交
1301
	struct nd_region *nd_region = to_nd_region(dev->parent);
1302
	ssize_t rc = 0;
1303 1304 1305 1306 1307 1308

	if (!is_namespace_blk(dev))
		return -ENXIO;

	device_lock(dev);
	nvdimm_bus_lock(dev);
1309 1310 1311 1312 1313
	if (to_ndns(dev)->claim)
		rc = -EBUSY;
	if (rc >= 0)
		rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
				ns_lbasize_supported);
D
Dan Williams 已提交
1314 1315 1316 1317 1318
	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");
1319 1320 1321 1322 1323 1324 1325
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

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

D
Dan Williams 已提交
1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
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);

1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381
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);

1382 1383 1384 1385 1386 1387 1388 1389 1390 1391
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;
1392
	if (claim && is_nd_btt(claim))
1393
		mode = "safe";
1394 1395
	else if (claim && is_nd_pfn(claim))
		mode = "memory";
1396 1397
	else if (claim && is_nd_dax(claim))
		mode = "dax";
1398 1399
	else if (!claim && pmem_should_map_pages(dev))
		mode = "memory";
1400 1401 1402 1403 1404 1405 1406 1407 1408
	else
		mode = "raw";
	rc = sprintf(buf, "%s\n", mode);
	device_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(mode);

1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
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);

1429 1430
static struct attribute *nd_namespace_attributes[] = {
	&dev_attr_nstype.attr,
1431
	&dev_attr_size.attr,
1432
	&dev_attr_mode.attr,
1433
	&dev_attr_uuid.attr,
1434
	&dev_attr_holder.attr,
1435 1436
	&dev_attr_resource.attr,
	&dev_attr_alt_name.attr,
1437
	&dev_attr_force_raw.attr,
1438
	&dev_attr_sector_size.attr,
D
Dan Williams 已提交
1439
	&dev_attr_dpa_extents.attr,
1440 1441 1442
	NULL,
};

1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
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)
1456
			return 0644;
1457 1458 1459 1460

		if (is_namespace_pmem(dev) && a == &dev_attr_sector_size.attr)
			return 0;

1461 1462 1463
		return a->mode;
	}

1464 1465
	if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
			|| a == &dev_attr_holder.attr
1466 1467
			|| a == &dev_attr_force_raw.attr
			|| a == &dev_attr_mode.attr)
1468 1469 1470 1471 1472
		return a->mode;

	return 0;
}

1473 1474
static struct attribute_group nd_namespace_attribute_group = {
	.attrs = nd_namespace_attributes,
1475
	.is_visible = namespace_visible,
1476 1477 1478 1479 1480
};

static const struct attribute_group *nd_namespace_attribute_groups[] = {
	&nd_device_attribute_group,
	&nd_namespace_attribute_group,
1481
	&nd_numa_attribute_group,
1482 1483 1484
	NULL,
};

1485 1486 1487
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;
1488
	struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1489
	struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1490
	struct nd_namespace_common *ndns = NULL;
1491 1492
	resource_size_t size;

1493
	if (nd_btt || nd_pfn || nd_dax) {
1494
		if (nd_btt)
1495
			ndns = nd_btt->ndns;
1496
		else if (nd_pfn)
1497
			ndns = nd_pfn->ndns;
1498 1499
		else if (nd_dax)
			ndns = nd_dax->nd_pfn.ndns;
1500

1501
		if (!ndns)
1502 1503 1504 1505 1506 1507 1508 1509 1510 1511
			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",
1512
					dev_name(dev));
1513 1514
			return ERR_PTR(-EBUSY);
		}
1515
		if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1516
					"host (%s) vs claim (%s) mismatch\n",
1517
					dev_name(dev),
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540
					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);
1541
		if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1542 1543
			return ERR_PTR(-ENODEV);
	} else if (is_namespace_blk(&ndns->dev)) {
1544 1545 1546
		struct nd_namespace_blk *nsblk;

		nsblk = to_nd_namespace_blk(&ndns->dev);
1547 1548 1549 1550 1551 1552 1553
		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);
		}
1554 1555
		if (!nd_namespace_blk_validate(nsblk))
			return ERR_PTR(-ENODEV);
1556 1557 1558 1559 1560 1561
	}

	return ndns;
}
EXPORT_SYMBOL(nvdimm_namespace_common_probe);

1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577
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;
	}

1578
	dev = &nsio->common.dev;
1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
	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;
}

1591 1592 1593 1594 1595 1596 1597 1598
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];
1599
		struct nd_label_ent *label_ent;
1600 1601
		bool found_uuid = false;

1602 1603 1604 1605 1606 1607 1608 1609 1610 1611
		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);
1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647

			if (isetcookie != cookie)
				continue;

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

			if (found_uuid) {
				dev_dbg(to_ndd(nd_mapping)->dev,
						"%s duplicate entry for uuid\n",
						__func__);
				return false;
			}
			found_uuid = true;
			if (nlabel != nd_region->ndr_mappings)
				continue;
			if (position != pos)
				continue;
			found = nd_label;
			break;
		}
		if (found)
			break;
	}
	return found != NULL;
}

static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
{
	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];
1648
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1649
		struct nd_namespace_label *nd_label = NULL;
1650
		u64 hw_start, hw_end, pmem_start, pmem_end;
1651
		struct nd_label_ent *label_ent;
1652

1653
		lockdep_assert_held(&nd_mapping->lock);
1654 1655 1656 1657
		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
			nd_label = label_ent->label;
			if (!nd_label)
				continue;
1658 1659
			if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
				break;
1660 1661
			nd_label = NULL;
		}
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673

		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;
1674 1675
		pmem_start = __le64_to_cpu(nd_label->dpa);
		pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1676 1677
		if (pmem_start >= hw_start && pmem_start < hw_end
				&& pmem_end <= hw_end && pmem_end > hw_start)
1678
			/* pass */;
1679 1680 1681
		else {
			dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
					dev_name(ndd->dev), nd_label->uuid);
1682
			return -EINVAL;
1683
		}
1684

1685 1686
		/* move recently validated label to the front of the list */
		list_move(&label_ent->list, &nd_mapping->labels);
1687 1688 1689 1690 1691
	}
	return 0;
}

/**
1692
 * create_namespace_pmem - validate interleave set labelling, retrieve label0
1693
 * @nd_region: region with mappings to validate
1694 1695
 * @nspm: target namespace to create
 * @nd_label: target pmem namespace label to evaluate
1696
 */
1697 1698
struct device *create_namespace_pmem(struct nd_region *nd_region,
		struct nd_namespace_label *nd_label)
1699 1700
{
	u64 cookie = nd_region_interleave_set_cookie(nd_region);
1701
	struct nd_label_ent *label_ent;
1702
	struct nd_namespace_pmem *nspm;
1703
	struct nd_mapping *nd_mapping;
1704
	resource_size_t size = 0;
1705 1706
	struct resource *res;
	struct device *dev;
1707
	int rc = 0;
1708 1709
	u16 i;

1710 1711
	if (cookie == 0) {
		dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1712
		return ERR_PTR(-ENXIO);
1713
	}
1714

1715 1716 1717 1718
	if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
		dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
				nd_label->uuid);
		return ERR_PTR(-EAGAIN);
1719
	}
1720

1721 1722 1723
	nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
	if (!nspm)
		return ERR_PTR(-ENOMEM);
1724

1725
	nspm->id = -1;
1726 1727 1728 1729 1730 1731
	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;
1732

1733 1734 1735 1736
	for (i = 0; i < nd_region->ndr_mappings; i++)
		if (!has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
			break;
	if (i < nd_region->ndr_mappings) {
1737 1738
		struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);

1739 1740 1741 1742 1743
		/*
		 * 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.
		 */
1744 1745
		dev_err(&nd_region->dev, "%s missing label for %pUb\n",
				dev_name(ndd->dev), nd_label->uuid);
1746
		rc = -EINVAL;
1747
		goto err;
1748
	}
1749 1750 1751 1752 1753 1754 1755 1756 1757

	/*
	 * 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).
	 */
1758
	rc = select_pmem_id(nd_region, nd_label->uuid);
1759 1760 1761 1762 1763
	if (rc)
		goto err;

	/* Calculate total size and populate namespace properties from label0 */
	for (i = 0; i < nd_region->ndr_mappings; i++) {
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
		struct nd_namespace_label *label0;

		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;
		}
1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790

		size += __le64_to_cpu(label0->rawsize);
		if (__le16_to_cpu(label0->position) != 0)
			continue;
		WARN_ON(nspm->alt_name || nspm->uuid);
		nspm->alt_name = kmemdup((void __force *) label0->name,
				NSLABEL_NAME_LEN, GFP_KERNEL);
		nspm->uuid = kmemdup((void __force *) label0->uuid,
				NSLABEL_UUID_LEN, GFP_KERNEL);
	}

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

1791
	nd_namespace_pmem_set_resource(nd_region, nspm, size);
1792

1793
	return dev;
1794
 err:
1795
	namespace_pmem_release(dev);
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807
	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;
	}
1808
	return ERR_PTR(rc);
1809 1810
}

1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845
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;

1846
	dev = &nsblk->common.dev;
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
	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;

1857
	return &nsblk->common.dev;
1858 1859
}

1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893
static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
{
	struct nd_namespace_pmem *nspm;
	struct resource *res;
	struct device *dev;

	if (!is_nd_pmem(&nd_region->dev))
		return NULL;

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

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

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

	return dev;
}

void nd_region_create_ns_seed(struct nd_region *nd_region)
1894 1895
{
	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1896 1897 1898 1899 1900 1901 1902 1903 1904

	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);

1905 1906 1907 1908 1909
	/*
	 * Seed creation failures are not fatal, provisioning is simply
	 * disabled until memory becomes available
	 */
	if (!nd_region->ns_seed)
1910 1911
		dev_err(&nd_region->dev, "failed to create %s namespace\n",
				is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
1912 1913 1914 1915
	else
		nd_device_register(nd_region->ns_seed);
}

1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927
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");
}

1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
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");
}

1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
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");
}

1952 1953 1954
static int add_namespace_resource(struct nd_region *nd_region,
		struct nd_namespace_label *nd_label, struct device **devs,
		int count)
1955
{
1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994
	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];
1995
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1996
	struct nd_namespace_blk *nsblk;
1997
	char name[NSLABEL_NAME_LEN];
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027
	struct device *dev = NULL;
	struct resource *res;

	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);
	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);
}

2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
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));
}

2053 2054
static struct device **scan_labels(struct nd_region *nd_region)
{
2055
	int i, count = 0;
2056 2057
	struct device *dev, **devs = NULL;
	struct nd_label_ent *label_ent, *e;
2058 2059
	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
	resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2060

2061 2062
	/* "safe" because create_namespace_pmem() might list_move() label_ent */
	list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2063
		struct nd_namespace_label *nd_label = label_ent->label;
2064
		struct device **__devs;
2065
		u32 flags;
2066

2067 2068 2069
		if (!nd_label)
			continue;
		flags = __le32_to_cpu(nd_label->flags);
2070 2071 2072
		if (is_nd_blk(&nd_region->dev)
				== !!(flags & NSLABEL_FLAG_LOCAL))
			/* pass, region matches label type */;
2073 2074 2075
		else
			continue;

2076 2077 2078 2079
		/* skip labels that describe extents outside of the region */
		if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
			continue;

2080 2081 2082
		i = add_namespace_resource(nd_region, nd_label, devs, count);
		if (i < 0)
			goto err;
2083 2084 2085 2086 2087 2088 2089 2090 2091
		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;

2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112
		if (is_nd_blk(&nd_region->dev)) {
			dev = create_namespace_blk(nd_region, nd_label, count);
			if (IS_ERR(dev))
				goto err;
			devs[count++] = dev;
		} else {
			dev = create_namespace_pmem(nd_region, nd_label);
			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;
		}
2113 2114
	}

2115 2116 2117
	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");
2118 2119 2120

	if (count == 0) {
		/* Publish a zero-sized namespace for userspace to configure. */
2121
		nd_mapping_free_labels(nd_mapping);
2122 2123 2124 2125

		devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
		if (!devs)
			goto err;
2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141
		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;
2142
			nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2143
		}
2144 2145
		dev->parent = &nd_region->dev;
		devs[count++] = dev;
2146 2147 2148
	} else if (is_nd_pmem(&nd_region->dev)) {
		/* clean unselected labels */
		for (i = 0; i < nd_region->ndr_mappings; i++) {
2149 2150 2151 2152
			struct list_head *l, *e;
			LIST_HEAD(list);
			int j;

2153 2154 2155 2156 2157
			nd_mapping = &nd_region->mapping[i];
			if (list_empty(&nd_mapping->labels)) {
				WARN_ON(1);
				continue;
			}
2158 2159 2160 2161 2162 2163 2164

			j = count;
			list_for_each_safe(l, e, &nd_mapping->labels) {
				if (!j--)
					break;
				list_move_tail(l, &list);
			}
2165
			nd_mapping_free_labels(nd_mapping);
2166
			list_splice_init(&list, &nd_mapping->labels);
2167
		}
2168 2169
	}

2170 2171 2172
	if (count > 1)
		sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);

2173 2174
	return devs;

2175
 err:
2176 2177 2178 2179 2180 2181 2182 2183
	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);
	}
2184 2185 2186
	return NULL;
}

2187
static struct device **create_namespaces(struct nd_region *nd_region)
2188 2189 2190
{
	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
	struct device **devs;
2191
	int i;
2192 2193 2194 2195

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

2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
	/* 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);
	}
2210 2211 2212 2213

	return devs;
}

2214 2215 2216 2217 2218 2219 2220 2221
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;
2222
		struct nd_label_ent *label_ent;
2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246
		int count, j;

		/*
		 * If the dimm is disabled then prevent the region from
		 * being activated if it aliases DPA.
		 */
		if (!ndd) {
			if ((nvdimm->flags & NDD_ALIASING) == 0)
				return 0;
			dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
					dev_name(&nd_mapping->nvdimm->dev));
			return -ENXIO;
		}
		nd_mapping->ndd = ndd;
		atomic_inc(&nvdimm->busy);
		get_ndd(ndd);

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

2247 2248 2249
			label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
			if (!label_ent)
				break;
2250
			label = nd_label_active(ndd, j);
2251 2252 2253 2254 2255
			label_ent->label = label;

			mutex_lock(&nd_mapping->lock);
			list_add_tail(&label_ent->list, &nd_mapping->labels);
			mutex_unlock(&nd_mapping->lock);
2256
		}
2257 2258 2259 2260 2261 2262 2263 2264

		if (j >= count)
			continue;

		mutex_lock(&nd_mapping->lock);
		nd_mapping_free_labels(nd_mapping);
		mutex_unlock(&nd_mapping->lock);
		return -ENOMEM;
2265 2266 2267 2268 2269
	}

	return 0;
}

2270 2271 2272
int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
{
	struct device **devs = NULL;
2273
	int i, rc = 0, type;
2274 2275

	*err = 0;
2276 2277 2278 2279 2280 2281 2282 2283 2284
	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) {
2285 2286 2287
	case ND_DEVICE_NAMESPACE_IO:
		devs = create_namespace_io(nd_region);
		break;
2288
	case ND_DEVICE_NAMESPACE_PMEM:
2289
	case ND_DEVICE_NAMESPACE_BLK:
2290
		devs = create_namespaces(nd_region);
2291
		break;
2292 2293 2294
	default:
		break;
	}
2295
	nvdimm_bus_unlock(&nd_region->dev);
2296 2297 2298 2299 2300 2301

	if (!devs)
		return -ENODEV;

	for (i = 0; devs[i]; i++) {
		struct device *dev = devs[i];
2302
		int id;
2303

2304 2305 2306 2307 2308 2309 2310
		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;
2311 2312 2313 2314 2315 2316 2317
		} 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;
2318 2319 2320 2321 2322 2323
		} else
			id = i;

		if (id < 0)
			break;
		dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2324 2325 2326
		dev->groups = nd_namespace_attribute_groups;
		nd_device_register(dev);
	}
2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346
	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;
	}
2347 2348
	kfree(devs);

2349 2350 2351
	if (rc == -ENODEV)
		return rc;

2352 2353
	return i;
}