region_devs.c 27.1 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/pmem.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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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)
{
	if (is_nd_pmem(&nd_region->dev)) {
		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;

	if (is_nd_pmem(dev)) {
		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;

	if (is_nd_pmem(dev) && nd_set)
		/* pass, should be precluded by region_visible */;
	else
		return -ENXIO;

	return sprintf(buf, "%#llx\n", nd_set->cookie);
}
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;

		if (is_nd_pmem(&nd_region->dev)) {
			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 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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	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_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr)
		return 0;

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	if (!is_nd_pmem(dev) && a == &dev_attr_dax_seed.attr)
		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 (!is_nd_pmem(dev) && a == &dev_attr_resource.attr)
		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;
	else if (is_nd_pmem(dev) && nd_set)
		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_interleave_set *nd_set = nd_region->nd_set;

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

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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;

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	if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) {
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		int i;

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

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			mutex_lock(&nd_mapping->lock);
			nd_mapping_free_labels(nd_mapping);
			mutex_unlock(&nd_mapping->lock);

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			put_ndd(ndd);
			nd_mapping->ndd = NULL;
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			if (ndd)
				atomic_dec(&nvdimm->busy);
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		}
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		if (is_nd_pmem(dev))
			return;
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	}
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	if (dev->parent && (is_nd_blk(dev->parent) || is_nd_pmem(dev->parent))
			&& probe) {
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		nd_region = to_nd_region(dev->parent);
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		nvdimm_bus_lock(dev);
		if (nd_region->ns_seed == dev)
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			nd_region_create_ns_seed(nd_region);
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		nvdimm_bus_unlock(dev);
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	}
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	if (is_nd_btt(dev) && probe) {
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		struct nd_btt *nd_btt = to_nd_btt(dev);

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		nd_region = to_nd_region(dev->parent);
		nvdimm_bus_lock(dev);
		if (nd_region->btt_seed == dev)
			nd_region_create_btt_seed(nd_region);
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		if (nd_region->ns_seed == &nd_btt->ndns->dev)
			nd_region_create_ns_seed(nd_region);
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		nvdimm_bus_unlock(dev);
	}
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	if (is_nd_pfn(dev) && probe) {
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		struct nd_pfn *nd_pfn = to_nd_pfn(dev);

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		nd_region = to_nd_region(dev->parent);
		nvdimm_bus_lock(dev);
		if (nd_region->pfn_seed == dev)
			nd_region_create_pfn_seed(nd_region);
655 656
		if (nd_region->ns_seed == &nd_pfn->ndns->dev)
			nd_region_create_ns_seed(nd_region);
657 658
		nvdimm_bus_unlock(dev);
	}
659
	if (is_nd_dax(dev) && probe) {
660 661
		struct nd_dax *nd_dax = to_nd_dax(dev);

662 663 664 665
		nd_region = to_nd_region(dev->parent);
		nvdimm_bus_lock(dev);
		if (nd_region->dax_seed == dev)
			nd_region_create_dax_seed(nd_region);
666 667
		if (nd_region->ns_seed == &nd_dax->nd_pfn.ndns->dev)
			nd_region_create_ns_seed(nd_region);
668 669
		nvdimm_bus_unlock(dev);
	}
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}

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);
}

682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
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;

	return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev),
			nd_mapping->start, nd_mapping->size);
}

#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);

794
int nd_blk_region_init(struct nd_region *nd_region)
795
{
796 797 798 799 800 801 802 803 804 805 806 807
	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) {
		dev_err(dev, "invalid BLK region\n");
		return -ENXIO;
	}

	return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
808 809
}

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/**
 * 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);

863 864 865 866 867 868
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;
869
	void *region_buf;
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Vishal Verma 已提交
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	unsigned int i;
871
	int ro = 0;
872 873

	for (i = 0; i < ndr_desc->num_mappings; i++) {
874 875
		struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
		struct nvdimm *nvdimm = mapping->nvdimm;
876

877
		if ((mapping->start | mapping->size) % SZ_4K) {
878 879 880 881 882
			dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n",
					caller, dev_name(&nvdimm->dev), i);

			return NULL;
		}
883

884
		if (test_bit(NDD_UNARMED, &nvdimm->flags))
885
			ro = 1;
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
	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)
911 912
		return NULL;
	nd_region->id = ida_simple_get(&region_ida, 0, 0, GFP_KERNEL);
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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;
926 927 928
	}

	for (i = 0; i < ndr_desc->num_mappings; i++) {
929 930 931 932 933 934
		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;
935 936
		INIT_LIST_HEAD(&nd_region->mapping[i].labels);
		mutex_init(&nd_region->mapping[i].lock);
937 938 939 940 941

		get_device(&nvdimm->dev);
	}
	nd_region->ndr_mappings = ndr_desc->num_mappings;
	nd_region->provider_data = ndr_desc->provider_data;
942
	nd_region->nd_set = ndr_desc->nd_set;
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Vishal Verma 已提交
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	nd_region->num_lanes = ndr_desc->num_lanes;
944
	nd_region->flags = ndr_desc->flags;
945
	nd_region->ro = ro;
946
	nd_region->numa_node = ndr_desc->numa_node;
947
	ida_init(&nd_region->ns_ida);
948
	ida_init(&nd_region->btt_ida);
949
	ida_init(&nd_region->pfn_ida);
950
	ida_init(&nd_region->dax_ida);
951 952 953 954 955 956 957 958 959 960
	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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 err_percpu:
	ida_simple_remove(&region_ida, nd_region->id);
 err_id:
965
	kfree(region_buf);
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	return NULL;
967 968 969 970 971
}

struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc)
{
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	ndr_desc->num_lanes = ND_MAX_LANES;
973 974 975 976 977 978 979 980 981 982
	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;
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	ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES);
984 985 986 987 988 989 990 991
	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)
{
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Vishal Verma 已提交
992
	ndr_desc->num_lanes = ND_MAX_LANES;
993 994 995 996
	return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type,
			__func__);
}
EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);
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998 999 1000 1001 1002 1003 1004
/**
 * 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);
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	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));
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022

	/*
	 * 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
	 * writes to avoid the cache via arch_memcpy_to_pmem().  The
	 * final wmb() ensures ordering for the NVDIMM flush write.
	 */
	wmb();
	for (i = 0; i < nd_region->ndr_mappings; i++)
1023 1024
		if (ndrd_get_flush_wpq(ndrd, i, 0))
			writeq(1, ndrd_get_flush_wpq(ndrd, i, idx));
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
	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;

	/* no nvdimm == flushing capability unknown */
	if (nd_region->ndr_mappings == 0)
		return -ENXIO;

1045 1046 1047 1048 1049 1050
	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)
1051
			return 1;
1052
	}
1053 1054 1055 1056 1057 1058 1059 1060 1061

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

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void __exit nd_region_devs_exit(void)
{
	ida_destroy(&region_ida);
}