region_devs.c 28.7 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.
 */
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#include <linux/scatterlist.h>
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#include <linux/highmem.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/hash.h>
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#include <linux/sort.h>
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#include <linux/io.h>
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#include <linux/nd.h>
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#include "nd-core.h"
#include "nd.h"

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/*
 * For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
 * irrelevant.
 */
#include <linux/io-64-nonatomic-hi-lo.h>

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static DEFINE_IDA(region_ida);
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static DEFINE_PER_CPU(int, flush_idx);
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static int nvdimm_map_flush(struct device *dev, struct nvdimm *nvdimm, int dimm,
		struct nd_region_data *ndrd)
{
	int i, j;

	dev_dbg(dev, "%s: map %d flush address%s\n", nvdimm_name(nvdimm),
			nvdimm->num_flush, nvdimm->num_flush == 1 ? "" : "es");
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	for (i = 0; i < (1 << ndrd->hints_shift); i++) {
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		struct resource *res = &nvdimm->flush_wpq[i];
		unsigned long pfn = PHYS_PFN(res->start);
		void __iomem *flush_page;

		/* check if flush hints share a page */
		for (j = 0; j < i; j++) {
			struct resource *res_j = &nvdimm->flush_wpq[j];
			unsigned long pfn_j = PHYS_PFN(res_j->start);

			if (pfn == pfn_j)
				break;
		}

		if (j < i)
			flush_page = (void __iomem *) ((unsigned long)
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					ndrd_get_flush_wpq(ndrd, dimm, j)
					& PAGE_MASK);
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		else
			flush_page = devm_nvdimm_ioremap(dev,
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					PFN_PHYS(pfn), PAGE_SIZE);
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		if (!flush_page)
			return -ENXIO;
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		ndrd_set_flush_wpq(ndrd, dimm, i, flush_page
				+ (res->start & ~PAGE_MASK));
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	}

	return 0;
}

int nd_region_activate(struct nd_region *nd_region)
{
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	int i, j, num_flush = 0;
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	struct nd_region_data *ndrd;
	struct device *dev = &nd_region->dev;
	size_t flush_data_size = sizeof(void *);

	nvdimm_bus_lock(&nd_region->dev);
	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
		struct nvdimm *nvdimm = nd_mapping->nvdimm;

		/* at least one null hint slot per-dimm for the "no-hint" case */
		flush_data_size += sizeof(void *);
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		num_flush = min_not_zero(num_flush, nvdimm->num_flush);
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		if (!nvdimm->num_flush)
			continue;
		flush_data_size += nvdimm->num_flush * sizeof(void *);
	}
	nvdimm_bus_unlock(&nd_region->dev);

	ndrd = devm_kzalloc(dev, sizeof(*ndrd) + flush_data_size, GFP_KERNEL);
	if (!ndrd)
		return -ENOMEM;
	dev_set_drvdata(dev, ndrd);

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	if (!num_flush)
		return 0;

	ndrd->hints_shift = ilog2(num_flush);
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	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
		struct nvdimm *nvdimm = nd_mapping->nvdimm;
		int rc = nvdimm_map_flush(&nd_region->dev, nvdimm, i, ndrd);

		if (rc)
			return rc;
	}

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	/*
	 * Clear out entries that are duplicates. This should prevent the
	 * extra flushings.
	 */
	for (i = 0; i < nd_region->ndr_mappings - 1; i++) {
		/* ignore if NULL already */
		if (!ndrd_get_flush_wpq(ndrd, i, 0))
			continue;

		for (j = i + 1; j < nd_region->ndr_mappings; j++)
			if (ndrd_get_flush_wpq(ndrd, i, 0) ==
			    ndrd_get_flush_wpq(ndrd, j, 0))
				ndrd_set_flush_wpq(ndrd, j, 0, NULL);
	}

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	return 0;
}

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static void nd_region_release(struct device *dev)
{
	struct nd_region *nd_region = to_nd_region(dev);
	u16 i;

	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
		struct nvdimm *nvdimm = nd_mapping->nvdimm;

		put_device(&nvdimm->dev);
	}
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	free_percpu(nd_region->lane);
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	ida_simple_remove(&region_ida, nd_region->id);
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	if (is_nd_blk(dev))
		kfree(to_nd_blk_region(dev));
	else
		kfree(nd_region);
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}

static struct device_type nd_blk_device_type = {
	.name = "nd_blk",
	.release = nd_region_release,
};

static struct device_type nd_pmem_device_type = {
	.name = "nd_pmem",
	.release = nd_region_release,
};

static struct device_type nd_volatile_device_type = {
	.name = "nd_volatile",
	.release = nd_region_release,
};

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bool is_nd_pmem(struct device *dev)
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{
	return dev ? dev->type == &nd_pmem_device_type : false;
}

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bool is_nd_blk(struct device *dev)
{
	return dev ? dev->type == &nd_blk_device_type : false;
}

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bool is_nd_volatile(struct device *dev)
{
	return dev ? dev->type == &nd_volatile_device_type : false;
}

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struct nd_region *to_nd_region(struct device *dev)
{
	struct nd_region *nd_region = container_of(dev, struct nd_region, dev);

	WARN_ON(dev->type->release != nd_region_release);
	return nd_region;
}
EXPORT_SYMBOL_GPL(to_nd_region);

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struct nd_blk_region *to_nd_blk_region(struct device *dev)
{
	struct nd_region *nd_region = to_nd_region(dev);

	WARN_ON(!is_nd_blk(dev));
	return container_of(nd_region, struct nd_blk_region, nd_region);
}
EXPORT_SYMBOL_GPL(to_nd_blk_region);

void *nd_region_provider_data(struct nd_region *nd_region)
{
	return nd_region->provider_data;
}
EXPORT_SYMBOL_GPL(nd_region_provider_data);

void *nd_blk_region_provider_data(struct nd_blk_region *ndbr)
{
	return ndbr->blk_provider_data;
}
EXPORT_SYMBOL_GPL(nd_blk_region_provider_data);

void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data)
{
	ndbr->blk_provider_data = data;
}
EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data);

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/**
 * nd_region_to_nstype() - region to an integer namespace type
 * @nd_region: region-device to interrogate
 *
 * This is the 'nstype' attribute of a region as well, an input to the
 * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match
 * namespace devices with namespace drivers.
 */
int nd_region_to_nstype(struct nd_region *nd_region)
{
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	if (is_memory(&nd_region->dev)) {
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		u16 i, alias;

		for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) {
			struct nd_mapping *nd_mapping = &nd_region->mapping[i];
			struct nvdimm *nvdimm = nd_mapping->nvdimm;

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			if (test_bit(NDD_ALIASING, &nvdimm->flags))
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				alias++;
		}
		if (alias)
			return ND_DEVICE_NAMESPACE_PMEM;
		else
			return ND_DEVICE_NAMESPACE_IO;
	} else if (is_nd_blk(&nd_region->dev)) {
		return ND_DEVICE_NAMESPACE_BLK;
	}

	return 0;
}
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EXPORT_SYMBOL(nd_region_to_nstype);

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static ssize_t size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	unsigned long long size = 0;

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	if (is_memory(dev)) {
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		size = nd_region->ndr_size;
	} else if (nd_region->ndr_mappings == 1) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[0];

		size = nd_mapping->size;
	}

	return sprintf(buf, "%llu\n", size);
}
static DEVICE_ATTR_RO(size);

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static ssize_t deep_flush_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);

	/*
	 * NOTE: in the nvdimm_has_flush() error case this attribute is
	 * not visible.
	 */
	return sprintf(buf, "%d\n", nvdimm_has_flush(nd_region));
}

static ssize_t deep_flush_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t len)
{
	bool flush;
	int rc = strtobool(buf, &flush);
	struct nd_region *nd_region = to_nd_region(dev);

	if (rc)
		return rc;
	if (!flush)
		return -EINVAL;
	nvdimm_flush(nd_region);

	return len;
}
static DEVICE_ATTR_RW(deep_flush);

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static ssize_t mappings_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);

	return sprintf(buf, "%d\n", nd_region->ndr_mappings);
}
static DEVICE_ATTR_RO(mappings);

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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);

	return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
}
static DEVICE_ATTR_RO(nstype);

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static ssize_t set_cookie_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	struct nd_interleave_set *nd_set = nd_region->nd_set;
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	ssize_t rc = 0;
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	if (is_memory(dev) && nd_set)
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		/* pass, should be precluded by region_visible */;
	else
		return -ENXIO;

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	/*
	 * The cookie to show depends on which specification of the
	 * labels we are using. If there are not labels then default to
	 * the v1.1 namespace label cookie definition. To read all this
	 * data we need to wait for probing to settle.
	 */
	device_lock(dev);
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
	if (nd_region->ndr_mappings) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[0];
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);

		if (ndd) {
			struct nd_namespace_index *nsindex;

			nsindex = to_namespace_index(ndd, ndd->ns_current);
			rc = sprintf(buf, "%#llx\n",
					nd_region_interleave_set_cookie(nd_region,
						nsindex));
		}
	}
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

	if (rc)
		return rc;
	return sprintf(buf, "%#llx\n", nd_set->cookie1);
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}
static DEVICE_ATTR_RO(set_cookie);

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resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
{
	resource_size_t blk_max_overlap = 0, available, overlap;
	int i;

	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));

 retry:
	available = 0;
	overlap = blk_max_overlap;
	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);

		/* if a dimm is disabled the available capacity is zero */
		if (!ndd)
			return 0;

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		if (is_memory(&nd_region->dev)) {
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			available += nd_pmem_available_dpa(nd_region,
					nd_mapping, &overlap);
			if (overlap > blk_max_overlap) {
				blk_max_overlap = overlap;
				goto retry;
			}
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		} else if (is_nd_blk(&nd_region->dev))
			available += nd_blk_available_dpa(nd_region);
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	}

	return available;
}

static ssize_t available_size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	unsigned long long available = 0;

	/*
	 * Flush in-flight updates and grab a snapshot of the available
	 * size.  Of course, this value is potentially invalidated the
	 * memory nvdimm_bus_lock() is dropped, but that's userspace's
	 * problem to not race itself.
	 */
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
	available = nd_region_available_dpa(nd_region);
	nvdimm_bus_unlock(dev);

	return sprintf(buf, "%llu\n", available);
}
static DEVICE_ATTR_RO(available_size);

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static ssize_t init_namespaces_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
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	struct nd_region_data *ndrd = dev_get_drvdata(dev);
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	ssize_t rc;

	nvdimm_bus_lock(dev);
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	if (ndrd)
		rc = sprintf(buf, "%d/%d\n", ndrd->ns_active, ndrd->ns_count);
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	else
		rc = -ENXIO;
	nvdimm_bus_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(init_namespaces);

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static ssize_t namespace_seed_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	ssize_t rc;

	nvdimm_bus_lock(dev);
	if (nd_region->ns_seed)
		rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed));
	else
		rc = sprintf(buf, "\n");
	nvdimm_bus_unlock(dev);
	return rc;
}
static DEVICE_ATTR_RO(namespace_seed);

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static ssize_t btt_seed_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	ssize_t rc;

	nvdimm_bus_lock(dev);
	if (nd_region->btt_seed)
		rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed));
	else
		rc = sprintf(buf, "\n");
	nvdimm_bus_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(btt_seed);

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static ssize_t pfn_seed_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	ssize_t rc;

	nvdimm_bus_lock(dev);
	if (nd_region->pfn_seed)
		rc = sprintf(buf, "%s\n", dev_name(nd_region->pfn_seed));
	else
		rc = sprintf(buf, "\n");
	nvdimm_bus_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(pfn_seed);

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static ssize_t dax_seed_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	ssize_t rc;

	nvdimm_bus_lock(dev);
	if (nd_region->dax_seed)
		rc = sprintf(buf, "%s\n", dev_name(nd_region->dax_seed));
	else
		rc = sprintf(buf, "\n");
	nvdimm_bus_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(dax_seed);

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static ssize_t read_only_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);

	return sprintf(buf, "%d\n", nd_region->ro);
}

static ssize_t read_only_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)
{
	bool ro;
	int rc = strtobool(buf, &ro);
	struct nd_region *nd_region = to_nd_region(dev);

	if (rc)
		return rc;

	nd_region->ro = ro;
	return len;
}
static DEVICE_ATTR_RW(read_only);

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static ssize_t region_badblocks_show(struct device *dev,
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		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);

	return badblocks_show(&nd_region->bb, buf, 0);
}
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static DEVICE_ATTR(badblocks, 0444, region_badblocks_show, NULL);
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static ssize_t resource_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);

	return sprintf(buf, "%#llx\n", nd_region->ndr_start);
}
static DEVICE_ATTR_RO(resource);

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static ssize_t persistence_domain_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	unsigned long flags = nd_region->flags;

	return sprintf(buf, "%s%s\n",
			flags & BIT(ND_REGION_PERSIST_CACHE) ? "cpu_cache " : "",
			flags & BIT(ND_REGION_PERSIST_MEMCTRL) ? "memory_controller " : "");
}
static DEVICE_ATTR_RO(persistence_domain);

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static struct attribute *nd_region_attributes[] = {
	&dev_attr_size.attr,
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	&dev_attr_nstype.attr,
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	&dev_attr_mappings.attr,
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	&dev_attr_btt_seed.attr,
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	&dev_attr_pfn_seed.attr,
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	&dev_attr_dax_seed.attr,
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	&dev_attr_deep_flush.attr,
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	&dev_attr_read_only.attr,
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	&dev_attr_set_cookie.attr,
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	&dev_attr_available_size.attr,
	&dev_attr_namespace_seed.attr,
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	&dev_attr_init_namespaces.attr,
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	&dev_attr_badblocks.attr,
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	&dev_attr_resource.attr,
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	&dev_attr_persistence_domain.attr,
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	NULL,
};

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static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, typeof(*dev), kobj);
	struct nd_region *nd_region = to_nd_region(dev);
	struct nd_interleave_set *nd_set = nd_region->nd_set;
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	int type = nd_region_to_nstype(nd_region);
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	if (!is_memory(dev) && a == &dev_attr_pfn_seed.attr)
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		return 0;

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	if (!is_memory(dev) && a == &dev_attr_dax_seed.attr)
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		return 0;

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	if (!is_nd_pmem(dev) && a == &dev_attr_badblocks.attr)
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		return 0;

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	if (a == &dev_attr_resource.attr) {
		if (is_nd_pmem(dev))
			return 0400;
		else
			return 0;
	}
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	if (a == &dev_attr_deep_flush.attr) {
		int has_flush = nvdimm_has_flush(nd_region);

		if (has_flush == 1)
			return a->mode;
		else if (has_flush == 0)
			return 0444;
		else
			return 0;
	}

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	if (a != &dev_attr_set_cookie.attr
			&& a != &dev_attr_available_size.attr)
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		return a->mode;

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	if ((type == ND_DEVICE_NAMESPACE_PMEM
				|| type == ND_DEVICE_NAMESPACE_BLK)
			&& a == &dev_attr_available_size.attr)
		return a->mode;
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	else if (is_memory(dev) && nd_set)
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		return a->mode;
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	return 0;
}

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struct attribute_group nd_region_attribute_group = {
	.attrs = nd_region_attributes,
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	.is_visible = region_visible,
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};
EXPORT_SYMBOL_GPL(nd_region_attribute_group);

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u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
		struct nd_namespace_index *nsindex)
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{
	struct nd_interleave_set *nd_set = nd_region->nd_set;

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	if (!nd_set)
		return 0;

	if (nsindex && __le16_to_cpu(nsindex->major) == 1
			&& __le16_to_cpu(nsindex->minor) == 1)
		return nd_set->cookie1;
	return nd_set->cookie2;
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}

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u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region)
{
	struct nd_interleave_set *nd_set = nd_region->nd_set;

	if (nd_set)
		return nd_set->altcookie;
	return 0;
}

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void nd_mapping_free_labels(struct nd_mapping *nd_mapping)
{
	struct nd_label_ent *label_ent, *e;

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	lockdep_assert_held(&nd_mapping->lock);
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	list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
		list_del(&label_ent->list);
		kfree(label_ent);
	}
}

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/*
 * Upon successful probe/remove, take/release a reference on the
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 * associated interleave set (if present), and plant new btt + namespace
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 * seeds.  Also, on the removal of a BLK region, notify the provider to
 * disable the region.
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 */
static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
		struct device *dev, bool probe)
{
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	struct nd_region *nd_region;

661
	if (!probe && is_nd_region(dev)) {
662 663
		int i;

664
		nd_region = to_nd_region(dev);
665 666
		for (i = 0; i < nd_region->ndr_mappings; i++) {
			struct nd_mapping *nd_mapping = &nd_region->mapping[i];
667
			struct nvdimm_drvdata *ndd = nd_mapping->ndd;
668 669
			struct nvdimm *nvdimm = nd_mapping->nvdimm;

670 671 672 673
			mutex_lock(&nd_mapping->lock);
			nd_mapping_free_labels(nd_mapping);
			mutex_unlock(&nd_mapping->lock);

674 675
			put_ndd(ndd);
			nd_mapping->ndd = NULL;
676 677
			if (ndd)
				atomic_dec(&nvdimm->busy);
678
		}
679
	}
680
	if (dev->parent && is_nd_region(dev->parent) && probe) {
681
		nd_region = to_nd_region(dev->parent);
682 683
		nvdimm_bus_lock(dev);
		if (nd_region->ns_seed == dev)
684
			nd_region_create_ns_seed(nd_region);
685
		nvdimm_bus_unlock(dev);
686
	}
687
	if (is_nd_btt(dev) && probe) {
688 689
		struct nd_btt *nd_btt = to_nd_btt(dev);

690 691 692 693
		nd_region = to_nd_region(dev->parent);
		nvdimm_bus_lock(dev);
		if (nd_region->btt_seed == dev)
			nd_region_create_btt_seed(nd_region);
694 695
		if (nd_region->ns_seed == &nd_btt->ndns->dev)
			nd_region_create_ns_seed(nd_region);
696 697
		nvdimm_bus_unlock(dev);
	}
698
	if (is_nd_pfn(dev) && probe) {
699 700
		struct nd_pfn *nd_pfn = to_nd_pfn(dev);

701 702 703 704
		nd_region = to_nd_region(dev->parent);
		nvdimm_bus_lock(dev);
		if (nd_region->pfn_seed == dev)
			nd_region_create_pfn_seed(nd_region);
705 706
		if (nd_region->ns_seed == &nd_pfn->ndns->dev)
			nd_region_create_ns_seed(nd_region);
707 708
		nvdimm_bus_unlock(dev);
	}
709
	if (is_nd_dax(dev) && probe) {
710 711
		struct nd_dax *nd_dax = to_nd_dax(dev);

712 713 714 715
		nd_region = to_nd_region(dev->parent);
		nvdimm_bus_lock(dev);
		if (nd_region->dax_seed == dev)
			nd_region_create_dax_seed(nd_region);
716 717
		if (nd_region->ns_seed == &nd_dax->nd_pfn.ndns->dev)
			nd_region_create_ns_seed(nd_region);
718 719
		nvdimm_bus_unlock(dev);
	}
720 721 722 723 724 725 726 727 728 729 730 731
}

void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
{
	nd_region_notify_driver_action(nvdimm_bus, dev, true);
}

void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
{
	nd_region_notify_driver_action(nvdimm_bus, dev, false);
}

732 733 734 735 736 737 738 739 740 741 742
static ssize_t mappingN(struct device *dev, char *buf, int n)
{
	struct nd_region *nd_region = to_nd_region(dev);
	struct nd_mapping *nd_mapping;
	struct nvdimm *nvdimm;

	if (n >= nd_region->ndr_mappings)
		return -ENXIO;
	nd_mapping = &nd_region->mapping[n];
	nvdimm = nd_mapping->nvdimm;

743 744 745
	return sprintf(buf, "%s,%llu,%llu,%d\n", dev_name(&nvdimm->dev),
			nd_mapping->start, nd_mapping->size,
			nd_mapping->position);
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844
}

#define REGION_MAPPING(idx) \
static ssize_t mapping##idx##_show(struct device *dev,		\
		struct device_attribute *attr, char *buf)	\
{								\
	return mappingN(dev, buf, idx);				\
}								\
static DEVICE_ATTR_RO(mapping##idx)

/*
 * 32 should be enough for a while, even in the presence of socket
 * interleave a 32-way interleave set is a degenerate case.
 */
REGION_MAPPING(0);
REGION_MAPPING(1);
REGION_MAPPING(2);
REGION_MAPPING(3);
REGION_MAPPING(4);
REGION_MAPPING(5);
REGION_MAPPING(6);
REGION_MAPPING(7);
REGION_MAPPING(8);
REGION_MAPPING(9);
REGION_MAPPING(10);
REGION_MAPPING(11);
REGION_MAPPING(12);
REGION_MAPPING(13);
REGION_MAPPING(14);
REGION_MAPPING(15);
REGION_MAPPING(16);
REGION_MAPPING(17);
REGION_MAPPING(18);
REGION_MAPPING(19);
REGION_MAPPING(20);
REGION_MAPPING(21);
REGION_MAPPING(22);
REGION_MAPPING(23);
REGION_MAPPING(24);
REGION_MAPPING(25);
REGION_MAPPING(26);
REGION_MAPPING(27);
REGION_MAPPING(28);
REGION_MAPPING(29);
REGION_MAPPING(30);
REGION_MAPPING(31);

static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nd_region *nd_region = to_nd_region(dev);

	if (n < nd_region->ndr_mappings)
		return a->mode;
	return 0;
}

static struct attribute *mapping_attributes[] = {
	&dev_attr_mapping0.attr,
	&dev_attr_mapping1.attr,
	&dev_attr_mapping2.attr,
	&dev_attr_mapping3.attr,
	&dev_attr_mapping4.attr,
	&dev_attr_mapping5.attr,
	&dev_attr_mapping6.attr,
	&dev_attr_mapping7.attr,
	&dev_attr_mapping8.attr,
	&dev_attr_mapping9.attr,
	&dev_attr_mapping10.attr,
	&dev_attr_mapping11.attr,
	&dev_attr_mapping12.attr,
	&dev_attr_mapping13.attr,
	&dev_attr_mapping14.attr,
	&dev_attr_mapping15.attr,
	&dev_attr_mapping16.attr,
	&dev_attr_mapping17.attr,
	&dev_attr_mapping18.attr,
	&dev_attr_mapping19.attr,
	&dev_attr_mapping20.attr,
	&dev_attr_mapping21.attr,
	&dev_attr_mapping22.attr,
	&dev_attr_mapping23.attr,
	&dev_attr_mapping24.attr,
	&dev_attr_mapping25.attr,
	&dev_attr_mapping26.attr,
	&dev_attr_mapping27.attr,
	&dev_attr_mapping28.attr,
	&dev_attr_mapping29.attr,
	&dev_attr_mapping30.attr,
	&dev_attr_mapping31.attr,
	NULL,
};

struct attribute_group nd_mapping_attribute_group = {
	.is_visible = mapping_visible,
	.attrs = mapping_attributes,
};
EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);

845
int nd_blk_region_init(struct nd_region *nd_region)
846
{
847 848 849 850 851 852 853
	struct device *dev = &nd_region->dev;
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

	if (!is_nd_blk(dev))
		return 0;

	if (nd_region->ndr_mappings < 1) {
854
		dev_dbg(dev, "invalid BLK region\n");
855 856 857 858
		return -ENXIO;
	}

	return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
859 860
}

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Vishal Verma 已提交
861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
/**
 * nd_region_acquire_lane - allocate and lock a lane
 * @nd_region: region id and number of lanes possible
 *
 * A lane correlates to a BLK-data-window and/or a log slot in the BTT.
 * We optimize for the common case where there are 256 lanes, one
 * per-cpu.  For larger systems we need to lock to share lanes.  For now
 * this implementation assumes the cost of maintaining an allocator for
 * free lanes is on the order of the lock hold time, so it implements a
 * static lane = cpu % num_lanes mapping.
 *
 * In the case of a BTT instance on top of a BLK namespace a lane may be
 * acquired recursively.  We lock on the first instance.
 *
 * In the case of a BTT instance on top of PMEM, we only acquire a lane
 * for the BTT metadata updates.
 */
unsigned int nd_region_acquire_lane(struct nd_region *nd_region)
{
	unsigned int cpu, lane;

	cpu = get_cpu();
	if (nd_region->num_lanes < nr_cpu_ids) {
		struct nd_percpu_lane *ndl_lock, *ndl_count;

		lane = cpu % nd_region->num_lanes;
		ndl_count = per_cpu_ptr(nd_region->lane, cpu);
		ndl_lock = per_cpu_ptr(nd_region->lane, lane);
		if (ndl_count->count++ == 0)
			spin_lock(&ndl_lock->lock);
	} else
		lane = cpu;

	return lane;
}
EXPORT_SYMBOL(nd_region_acquire_lane);

void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane)
{
	if (nd_region->num_lanes < nr_cpu_ids) {
		unsigned int cpu = get_cpu();
		struct nd_percpu_lane *ndl_lock, *ndl_count;

		ndl_count = per_cpu_ptr(nd_region->lane, cpu);
		ndl_lock = per_cpu_ptr(nd_region->lane, lane);
		if (--ndl_count->count == 0)
			spin_unlock(&ndl_lock->lock);
		put_cpu();
	}
	put_cpu();
}
EXPORT_SYMBOL(nd_region_release_lane);

914 915 916 917 918 919
static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc, struct device_type *dev_type,
		const char *caller)
{
	struct nd_region *nd_region;
	struct device *dev;
920
	void *region_buf;
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Vishal Verma 已提交
921
	unsigned int i;
922
	int ro = 0;
923 924

	for (i = 0; i < ndr_desc->num_mappings; i++) {
925 926
		struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
		struct nvdimm *nvdimm = mapping->nvdimm;
927

928
		if ((mapping->start | mapping->size) % SZ_4K) {
929 930 931 932 933
			dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n",
					caller, dev_name(&nvdimm->dev), i);

			return NULL;
		}
934

935
		if (test_bit(NDD_UNARMED, &nvdimm->flags))
936
			ro = 1;
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
	if (dev_type == &nd_blk_device_type) {
		struct nd_blk_region_desc *ndbr_desc;
		struct nd_blk_region *ndbr;

		ndbr_desc = to_blk_region_desc(ndr_desc);
		ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping)
				* ndr_desc->num_mappings,
				GFP_KERNEL);
		if (ndbr) {
			nd_region = &ndbr->nd_region;
			ndbr->enable = ndbr_desc->enable;
			ndbr->do_io = ndbr_desc->do_io;
		}
		region_buf = ndbr;
	} else {
		nd_region = kzalloc(sizeof(struct nd_region)
				+ sizeof(struct nd_mapping)
				* ndr_desc->num_mappings,
				GFP_KERNEL);
		region_buf = nd_region;
	}

	if (!region_buf)
962 963
		return NULL;
	nd_region->id = ida_simple_get(&region_ida, 0, 0, GFP_KERNEL);
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Vishal Verma 已提交
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	if (nd_region->id < 0)
		goto err_id;

	nd_region->lane = alloc_percpu(struct nd_percpu_lane);
	if (!nd_region->lane)
		goto err_percpu;

        for (i = 0; i < nr_cpu_ids; i++) {
		struct nd_percpu_lane *ndl;

		ndl = per_cpu_ptr(nd_region->lane, i);
		spin_lock_init(&ndl->lock);
		ndl->count = 0;
977 978 979
	}

	for (i = 0; i < ndr_desc->num_mappings; i++) {
980 981 982 983 984 985
		struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
		struct nvdimm *nvdimm = mapping->nvdimm;

		nd_region->mapping[i].nvdimm = nvdimm;
		nd_region->mapping[i].start = mapping->start;
		nd_region->mapping[i].size = mapping->size;
986
		nd_region->mapping[i].position = mapping->position;
987 988
		INIT_LIST_HEAD(&nd_region->mapping[i].labels);
		mutex_init(&nd_region->mapping[i].lock);
989 990 991 992 993

		get_device(&nvdimm->dev);
	}
	nd_region->ndr_mappings = ndr_desc->num_mappings;
	nd_region->provider_data = ndr_desc->provider_data;
994
	nd_region->nd_set = ndr_desc->nd_set;
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Vishal Verma 已提交
995
	nd_region->num_lanes = ndr_desc->num_lanes;
996
	nd_region->flags = ndr_desc->flags;
997
	nd_region->ro = ro;
998
	nd_region->numa_node = ndr_desc->numa_node;
999
	ida_init(&nd_region->ns_ida);
1000
	ida_init(&nd_region->btt_ida);
1001
	ida_init(&nd_region->pfn_ida);
1002
	ida_init(&nd_region->dax_ida);
1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
	dev = &nd_region->dev;
	dev_set_name(dev, "region%d", nd_region->id);
	dev->parent = &nvdimm_bus->dev;
	dev->type = dev_type;
	dev->groups = ndr_desc->attr_groups;
	nd_region->ndr_size = resource_size(ndr_desc->res);
	nd_region->ndr_start = ndr_desc->res->start;
	nd_device_register(dev);

	return nd_region;
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Vishal Verma 已提交
1013 1014 1015 1016

 err_percpu:
	ida_simple_remove(&region_ida, nd_region->id);
 err_id:
1017
	kfree(region_buf);
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Vishal Verma 已提交
1018
	return NULL;
1019 1020 1021 1022 1023
}

struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc)
{
V
Vishal Verma 已提交
1024
	ndr_desc->num_lanes = ND_MAX_LANES;
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
	return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type,
			__func__);
}
EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create);

struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc)
{
	if (ndr_desc->num_mappings > 1)
		return NULL;
V
Vishal Verma 已提交
1035
	ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES);
1036 1037 1038 1039 1040 1041 1042 1043
	return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type,
			__func__);
}
EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);

struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc)
{
V
Vishal Verma 已提交
1044
	ndr_desc->num_lanes = ND_MAX_LANES;
1045 1046 1047 1048
	return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type,
			__func__);
}
EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);
D
Dan Williams 已提交
1049

1050 1051 1052 1053 1054 1055 1056
/**
 * nvdimm_flush - flush any posted write queues between the cpu and pmem media
 * @nd_region: blk or interleaved pmem region
 */
void nvdimm_flush(struct nd_region *nd_region)
{
	struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev);
D
Dan Williams 已提交
1057 1058 1059 1060 1061 1062 1063 1064
	int i, idx;

	/*
	 * Try to encourage some diversity in flush hint addresses
	 * across cpus assuming a limited number of flush hints.
	 */
	idx = this_cpu_read(flush_idx);
	idx = this_cpu_add_return(flush_idx, hash_32(current->pid + idx, 8));
1065 1066 1067 1068 1069

	/*
	 * The first wmb() is needed to 'sfence' all previous writes
	 * such that they are architecturally visible for the platform
	 * buffer flush.  Note that we've already arranged for pmem
1070 1071
	 * writes to avoid the cache via memcpy_flushcache().  The final
	 * wmb() ensures ordering for the NVDIMM flush write.
1072 1073 1074
	 */
	wmb();
	for (i = 0; i < nd_region->ndr_mappings; i++)
1075 1076
		if (ndrd_get_flush_wpq(ndrd, i, 0))
			writeq(1, ndrd_get_flush_wpq(ndrd, i, idx));
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
	wmb();
}
EXPORT_SYMBOL_GPL(nvdimm_flush);

/**
 * nvdimm_has_flush - determine write flushing requirements
 * @nd_region: blk or interleaved pmem region
 *
 * Returns 1 if writes require flushing
 * Returns 0 if writes do not require flushing
 * Returns -ENXIO if flushing capability can not be determined
 */
int nvdimm_has_flush(struct nd_region *nd_region)
{
	int i;

1093 1094 1095
	/* no nvdimm or pmem api == flushing capability unknown */
	if (nd_region->ndr_mappings == 0
			|| !IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API))
1096 1097
		return -ENXIO;

1098 1099 1100 1101 1102 1103
	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
		struct nvdimm *nvdimm = nd_mapping->nvdimm;

		/* flush hints present / available */
		if (nvdimm->num_flush)
1104
			return 1;
1105
	}
1106 1107 1108 1109 1110 1111 1112 1113 1114

	/*
	 * The platform defines dimm devices without hints, assume
	 * platform persistence mechanism like ADR
	 */
	return 0;
}
EXPORT_SYMBOL_GPL(nvdimm_has_flush);

1115 1116 1117 1118 1119 1120
int nvdimm_has_cache(struct nd_region *nd_region)
{
	return is_nd_pmem(&nd_region->dev);
}
EXPORT_SYMBOL_GPL(nvdimm_has_cache);

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Dan Williams 已提交
1121 1122 1123 1124
void __exit nd_region_devs_exit(void)
{
	ida_destroy(&region_ida);
}