[mirror_ubuntu-bionic-kernel.git] / drivers / nvdimm / core.c

/*
 * 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/libnvdimm.h>
#include <linux/badblocks.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/ctype.h>
#include <linux/ndctl.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/io.h>
#include "nd-core.h"
#include "nd.h"

LIST_HEAD(nvdimm_bus_list);
DEFINE_MUTEX(nvdimm_bus_list_mutex);

void nvdimm_bus_lock(struct device *dev)
{
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

	if (!nvdimm_bus)
		return;
	mutex_lock(&nvdimm_bus->reconfig_mutex);
}
EXPORT_SYMBOL(nvdimm_bus_lock);

void nvdimm_bus_unlock(struct device *dev)
{
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

	if (!nvdimm_bus)
		return;
	mutex_unlock(&nvdimm_bus->reconfig_mutex);
}
EXPORT_SYMBOL(nvdimm_bus_unlock);

bool is_nvdimm_bus_locked(struct device *dev)
{
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

	if (!nvdimm_bus)
		return false;
	return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
}
EXPORT_SYMBOL(is_nvdimm_bus_locked);

struct nvdimm_map {
	struct nvdimm_bus *nvdimm_bus;
	struct list_head list;
	resource_size_t offset;
	unsigned long flags;
	size_t size;
	union {
		void *mem;
		void __iomem *iomem;
	};
	struct kref kref;
};

static struct nvdimm_map *find_nvdimm_map(struct device *dev,
		resource_size_t offset)
{
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	struct nvdimm_map *nvdimm_map;

	list_for_each_entry(nvdimm_map, &nvdimm_bus->mapping_list, list)
		if (nvdimm_map->offset == offset)
			return nvdimm_map;
	return NULL;
}

static struct nvdimm_map *alloc_nvdimm_map(struct device *dev,
		resource_size_t offset, size_t size, unsigned long flags)
{
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	struct nvdimm_map *nvdimm_map;

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

	INIT_LIST_HEAD(&nvdimm_map->list);
	nvdimm_map->nvdimm_bus = nvdimm_bus;
	nvdimm_map->offset = offset;
	nvdimm_map->flags = flags;
	nvdimm_map->size = size;
	kref_init(&nvdimm_map->kref);

	if (!request_mem_region(offset, size, dev_name(&nvdimm_bus->dev))) {
		dev_err(&nvdimm_bus->dev, "failed to request %pa + %zd for %s\n",
				&offset, size, dev_name(dev));
		goto err_request_region;
	}

	if (flags)
		nvdimm_map->mem = memremap(offset, size, flags);
	else
		nvdimm_map->iomem = ioremap(offset, size);

	if (!nvdimm_map->mem)
		goto err_map;

	dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev), "%s: bus unlocked!",
			__func__);
	list_add(&nvdimm_map->list, &nvdimm_bus->mapping_list);

	return nvdimm_map;

 err_map:
	release_mem_region(offset, size);
 err_request_region:
	kfree(nvdimm_map);
	return NULL;
}

static void nvdimm_map_release(struct kref *kref)
{
	struct nvdimm_bus *nvdimm_bus;
	struct nvdimm_map *nvdimm_map;

	nvdimm_map = container_of(kref, struct nvdimm_map, kref);
	nvdimm_bus = nvdimm_map->nvdimm_bus;

	dev_dbg(&nvdimm_bus->dev, "%s: %pa\n", __func__, &nvdimm_map->offset);
	list_del(&nvdimm_map->list);
	if (nvdimm_map->flags)
		memunmap(nvdimm_map->mem);
	else
		iounmap(nvdimm_map->iomem);
	release_mem_region(nvdimm_map->offset, nvdimm_map->size);
	kfree(nvdimm_map);
}

static void nvdimm_map_put(void *data)
{
	struct nvdimm_map *nvdimm_map = data;
	struct nvdimm_bus *nvdimm_bus = nvdimm_map->nvdimm_bus;

	nvdimm_bus_lock(&nvdimm_bus->dev);
	kref_put(&nvdimm_map->kref, nvdimm_map_release);
	nvdimm_bus_unlock(&nvdimm_bus->dev);
}

/**
 * devm_nvdimm_memremap - map a resource that is shared across regions
 * @dev: device that will own a reference to the shared mapping
 * @offset: physical base address of the mapping
 * @size: mapping size
 * @flags: memremap flags, or, if zero, perform an ioremap instead
 */
void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
		size_t size, unsigned long flags)
{
	struct nvdimm_map *nvdimm_map;

	nvdimm_bus_lock(dev);
	nvdimm_map = find_nvdimm_map(dev, offset);
	if (!nvdimm_map)
		nvdimm_map = alloc_nvdimm_map(dev, offset, size, flags);
	else
		kref_get(&nvdimm_map->kref);
	nvdimm_bus_unlock(dev);

	if (!nvdimm_map)
		return NULL;

	if (devm_add_action_or_reset(dev, nvdimm_map_put, nvdimm_map))
		return NULL;

	return nvdimm_map->mem;
}
EXPORT_SYMBOL_GPL(devm_nvdimm_memremap);

u64 nd_fletcher64(void *addr, size_t len, bool le)
{
	u32 *buf = addr;
	u32 lo32 = 0;
	u64 hi32 = 0;
	int i;

	for (i = 0; i < len / sizeof(u32); i++) {
		lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
		hi32 += lo32;
	}

	return hi32 << 32 | lo32;
}
EXPORT_SYMBOL_GPL(nd_fletcher64);

struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus)
{
	/* struct nvdimm_bus definition is private to libnvdimm */
	return nvdimm_bus->nd_desc;
}
EXPORT_SYMBOL_GPL(to_nd_desc);

struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus)
{
	/* struct nvdimm_bus definition is private to libnvdimm */
	return &nvdimm_bus->dev;
}
EXPORT_SYMBOL_GPL(to_nvdimm_bus_dev);

static bool is_uuid_sep(char sep)
{
	if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0')
		return true;
	return false;
}

static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
		size_t len)
{
	const char *str = buf;
	u8 uuid[16];
	int i;

	for (i = 0; i < 16; i++) {
		if (!isxdigit(str[0]) || !isxdigit(str[1])) {
			dev_dbg(dev, "%s: pos: %d buf[%zd]: %c buf[%zd]: %c\n",
					__func__, i, str - buf, str[0],
					str + 1 - buf, str[1]);
			return -EINVAL;
		}

		uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]);
		str += 2;
		if (is_uuid_sep(*str))
			str++;
	}

	memcpy(uuid_out, uuid, sizeof(uuid));
	return 0;
}

/**
 * nd_uuid_store: common implementation for writing 'uuid' sysfs attributes
 * @dev: container device for the uuid property
 * @uuid_out: uuid buffer to replace
 * @buf: raw sysfs buffer to parse
 *
 * Enforce that uuids can only be changed while the device is disabled
 * (driver detached)
 * LOCKING: expects device_lock() is held on entry
 */
int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
		size_t len)
{
	u8 uuid[16];
	int rc;

	if (dev->driver)
		return -EBUSY;

	rc = nd_uuid_parse(dev, uuid, buf, len);
	if (rc)
		return rc;

	kfree(*uuid_out);
	*uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
	if (!(*uuid_out))
		return -ENOMEM;

	return 0;
}

ssize_t nd_size_select_show(unsigned long current_size,
		const unsigned long *supported, char *buf)
{
	ssize_t len = 0;
	int i;

	for (i = 0; supported[i]; i++)
		if (current_size == supported[i])
			len += sprintf(buf + len, "[%ld] ", supported[i]);
		else
			len += sprintf(buf + len, "%ld ", supported[i]);
	len += sprintf(buf + len, "\n");
	return len;
}

ssize_t nd_size_select_store(struct device *dev, const char *buf,
		unsigned long *current_size, const unsigned long *supported)
{
	unsigned long lbasize;
	int rc, i;

	if (dev->driver)
		return -EBUSY;

	rc = kstrtoul(buf, 0, &lbasize);
	if (rc)
		return rc;

	for (i = 0; supported[i]; i++)
		if (lbasize == supported[i])
			break;

	if (supported[i]) {
		*current_size = lbasize;
		return 0;
	} else {
		return -EINVAL;
	}
}

static ssize_t commands_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	int cmd, len = 0;
	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;

	for_each_set_bit(cmd, &nd_desc->cmd_mask, BITS_PER_LONG)
		len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd));
	len += sprintf(buf + len, "\n");
	return len;
}
static DEVICE_ATTR_RO(commands);

static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
{
	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
	struct device *parent = nvdimm_bus->dev.parent;

	if (nd_desc->provider_name)
		return nd_desc->provider_name;
	else if (parent)
		return dev_name(parent);
	else
		return "unknown";
}

static ssize_t provider_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);

	return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus));
}
static DEVICE_ATTR_RO(provider);

static int flush_namespaces(struct device *dev, void *data)
{
	device_lock(dev);
	device_unlock(dev);
	return 0;
}

static int flush_regions_dimms(struct device *dev, void *data)
{
	device_lock(dev);
	device_unlock(dev);
	device_for_each_child(dev, NULL, flush_namespaces);
	return 0;
}

static ssize_t wait_probe_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
	int rc;

	if (nd_desc->flush_probe) {
		rc = nd_desc->flush_probe(nd_desc);
		if (rc)
			return rc;
	}
	nd_synchronize();
	device_for_each_child(dev, NULL, flush_regions_dimms);
	return sprintf(buf, "1\n");
}
static DEVICE_ATTR_RO(wait_probe);

static struct attribute *nvdimm_bus_attributes[] = {
	&dev_attr_commands.attr,
	&dev_attr_wait_probe.attr,
	&dev_attr_provider.attr,
	NULL,
};

struct attribute_group nvdimm_bus_attribute_group = {
	.attrs = nvdimm_bus_attributes,
};
EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);

int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
{
	return badrange_add(&nvdimm_bus->badrange, addr, length);
}
EXPORT_SYMBOL_GPL(nvdimm_bus_add_badrange);

#ifdef CONFIG_BLK_DEV_INTEGRITY
int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
{
	struct blk_integrity bi;

	if (meta_size == 0)
		return 0;

	memset(&bi, 0, sizeof(bi));

	bi.tuple_size = meta_size;
	bi.tag_size = meta_size;

	blk_integrity_register(disk, &bi);
	blk_queue_max_integrity_segments(disk->queue, 1);

	return 0;
}
EXPORT_SYMBOL(nd_integrity_init);

#else /* CONFIG_BLK_DEV_INTEGRITY */
int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
{
	return 0;
}
EXPORT_SYMBOL(nd_integrity_init);

#endif

static __init int libnvdimm_init(void)
{
	int rc;

	rc = nvdimm_bus_init();
	if (rc)
		return rc;
	rc = nvdimm_init();
	if (rc)
		goto err_dimm;
	rc = nd_region_init();
	if (rc)
		goto err_region;

	nd_label_init();

	return 0;
 err_region:
	nvdimm_exit();
 err_dimm:
	nvdimm_bus_exit();
	return rc;
}

static __exit void libnvdimm_exit(void)
{
	WARN_ON(!list_empty(&nvdimm_bus_list));
	nd_region_exit();
	nvdimm_exit();
	nvdimm_bus_exit();
	nd_region_devs_exit();
	nvdimm_devs_exit();
}

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Intel Corporation");
subsys_initcall(libnvdimm_init);
module_exit(libnvdimm_exit);
Commit	Line	Data
b94d5230 DW	1	/*
	2	* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of version 2 of the GNU General Public License as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*/
	13	#include <linux/libnvdimm.h>
b95f5f43	14	#include <linux/badblocks.h>
b94d5230 DW	15	#include <linux/export.h>
b94d5230 DW	16	#include <linux/module.h>
41cd8b70	17	#include <linux/blkdev.h>
b94d5230	18	#include <linux/device.h>
bf9bccc1	19	#include <linux/ctype.h>
62232e45	20	#include <linux/ndctl.h>
45def22c	21	#include <linux/mutex.h>
b94d5230	22	#include <linux/slab.h>
29b9aa0a	23	#include <linux/io.h>
b94d5230	24	#include "nd-core.h"
4d88a97a	25	#include "nd.h"
b94d5230	26
e6dfb2de DW	27	LIST_HEAD(nvdimm_bus_list);
e6dfb2de DW	28	DEFINE_MUTEX(nvdimm_bus_list_mutex);
b94d5230	29
3d88002e DW	30	void nvdimm_bus_lock(struct device *dev)
	31	{
	32	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	33
	34	if (!nvdimm_bus)
	35	return;
	36	mutex_lock(&nvdimm_bus->reconfig_mutex);
	37	}
	38	EXPORT_SYMBOL(nvdimm_bus_lock);
	39
	40	void nvdimm_bus_unlock(struct device *dev)
	41	{
	42	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	43
	44	if (!nvdimm_bus)
	45	return;
	46	mutex_unlock(&nvdimm_bus->reconfig_mutex);
	47	}
	48	EXPORT_SYMBOL(nvdimm_bus_unlock);
	49
	50	bool is_nvdimm_bus_locked(struct device *dev)
	51	{
	52	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	53
	54	if (!nvdimm_bus)
	55	return false;
	56	return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
	57	}
	58	EXPORT_SYMBOL(is_nvdimm_bus_locked);
	59
29b9aa0a DW	60	struct nvdimm_map {
	61	struct nvdimm_bus *nvdimm_bus;
	62	struct list_head list;
	63	resource_size_t offset;
	64	unsigned long flags;
	65	size_t size;
	66	union {
	67	void *mem;
	68	void __iomem *iomem;
	69	};
	70	struct kref kref;
	71	};
	72
	73	static struct nvdimm_map find_nvdimm_map(struct device dev,
	74	resource_size_t offset)
	75	{
	76	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	77	struct nvdimm_map *nvdimm_map;
	78
	79	list_for_each_entry(nvdimm_map, &nvdimm_bus->mapping_list, list)
	80	if (nvdimm_map->offset == offset)
	81	return nvdimm_map;
	82	return NULL;
	83	}
	84
	85	static struct nvdimm_map alloc_nvdimm_map(struct device dev,
	86	resource_size_t offset, size_t size, unsigned long flags)
	87	{
	88	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	89	struct nvdimm_map *nvdimm_map;
	90
	91	nvdimm_map = kzalloc(sizeof(*nvdimm_map), GFP_KERNEL);
	92	if (!nvdimm_map)
	93	return NULL;
	94
	95	INIT_LIST_HEAD(&nvdimm_map->list);
	96	nvdimm_map->nvdimm_bus = nvdimm_bus;
	97	nvdimm_map->offset = offset;
	98	nvdimm_map->flags = flags;
	99	nvdimm_map->size = size;
	100	kref_init(&nvdimm_map->kref);
	101
ecfb6d8a DW	102	if (!request_mem_region(offset, size, dev_name(&nvdimm_bus->dev))) {
	103	dev_err(&nvdimm_bus->dev, "failed to request %pa + %zd for %s\n",
	104	&offset, size, dev_name(dev));
29b9aa0a	105	goto err_request_region;
ecfb6d8a	106	}
29b9aa0a DW	107
	108	if (flags)
	109	nvdimm_map->mem = memremap(offset, size, flags);
	110	else
	111	nvdimm_map->iomem = ioremap(offset, size);
	112
	113	if (!nvdimm_map->mem)
	114	goto err_map;
	115
	116	dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev), "%s: bus unlocked!",
	117	__func__);
	118	list_add(&nvdimm_map->list, &nvdimm_bus->mapping_list);
	119
	120	return nvdimm_map;
	121
	122	err_map:
	123	release_mem_region(offset, size);
	124	err_request_region:
	125	kfree(nvdimm_map);
	126	return NULL;
	127	}
	128
	129	static void nvdimm_map_release(struct kref *kref)
	130	{
	131	struct nvdimm_bus *nvdimm_bus;
	132	struct nvdimm_map *nvdimm_map;
	133
	134	nvdimm_map = container_of(kref, struct nvdimm_map, kref);
	135	nvdimm_bus = nvdimm_map->nvdimm_bus;
	136
	137	dev_dbg(&nvdimm_bus->dev, "%s: %pa\n", __func__, &nvdimm_map->offset);
	138	list_del(&nvdimm_map->list);
	139	if (nvdimm_map->flags)
	140	memunmap(nvdimm_map->mem);
	141	else
	142	iounmap(nvdimm_map->iomem);
	143	release_mem_region(nvdimm_map->offset, nvdimm_map->size);
	144	kfree(nvdimm_map);
	145	}
	146
	147	static void nvdimm_map_put(void *data)
	148	{
	149	struct nvdimm_map *nvdimm_map = data;
	150	struct nvdimm_bus *nvdimm_bus = nvdimm_map->nvdimm_bus;
	151
	152	nvdimm_bus_lock(&nvdimm_bus->dev);
	153	kref_put(&nvdimm_map->kref, nvdimm_map_release);
	154	nvdimm_bus_unlock(&nvdimm_bus->dev);
	155	}
	156
	157	/**
	158	* devm_nvdimm_memremap - map a resource that is shared across regions
	159	* @dev: device that will own a reference to the shared mapping
	160	* @offset: physical base address of the mapping
	161	* @size: mapping size
	162	* @flags: memremap flags, or, if zero, perform an ioremap instead
	163	*/
	164	void devm_nvdimm_memremap(struct device dev, resource_size_t offset,
	165	size_t size, unsigned long flags)
	166	{
	167	struct nvdimm_map *nvdimm_map;
	168
	169	nvdimm_bus_lock(dev);
	170	nvdimm_map = find_nvdimm_map(dev, offset);
171	if (!nvdimm_map)
172	nvdimm_map = alloc_nvdimm_map(dev, offset, size, flags);
173	else
174	kref_get(&nvdimm_map->kref);
175	nvdimm_bus_unlock(dev);
176
ecfb6d8a DW	177	if (!nvdimm_map)
	178	return NULL;
	179
29b9aa0a DW	180	if (devm_add_action_or_reset(dev, nvdimm_map_put, nvdimm_map))
	181	return NULL;
	182
	183	return nvdimm_map->mem;
	184	}
	185	EXPORT_SYMBOL_GPL(devm_nvdimm_memremap);
	186
eaf96153 DW	187	u64 nd_fletcher64(void *addr, size_t len, bool le)
	188	{
	189	u32 *buf = addr;
	190	u32 lo32 = 0;
	191	u64 hi32 = 0;
	192	int i;
	193
	194	for (i = 0; i < len / sizeof(u32); i++) {
	195	lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
	196	hi32 += lo32;
	197	}
	198
	199	return hi32 << 32 \| lo32;
	200	}
	201	EXPORT_SYMBOL_GPL(nd_fletcher64);
	202
45def22c DW	203	struct nvdimm_bus_descriptor to_nd_desc(struct nvdimm_bus nvdimm_bus)
	204	{
	205	/* struct nvdimm_bus definition is private to libnvdimm */
	206	return nvdimm_bus->nd_desc;
	207	}
	208	EXPORT_SYMBOL_GPL(to_nd_desc);
	209
37b137ff VV	210	struct device to_nvdimm_bus_dev(struct nvdimm_bus nvdimm_bus)
	211	{
	212	/* struct nvdimm_bus definition is private to libnvdimm */
	213	return &nvdimm_bus->dev;
	214	}
	215	EXPORT_SYMBOL_GPL(to_nvdimm_bus_dev);
	216
bf9bccc1 DW	217	static bool is_uuid_sep(char sep)
	218	{
	219	if (sep == '\n' \|\| sep == '-' \|\| sep == ':' \|\| sep == '\0')
	220	return true;
	221	return false;
	222	}
	223
	224	static int nd_uuid_parse(struct device dev, u8 uuid_out, const char *buf,
	225	size_t len)
	226	{
	227	const char *str = buf;
	228	u8 uuid[16];
	229	int i;
	230
	231	for (i = 0; i < 16; i++) {
	232	if (!isxdigit(str[0]) \|\| !isxdigit(str[1])) {
	233	dev_dbg(dev, "%s: pos: %d buf[%zd]: %c buf[%zd]: %c\n",
	234	__func__, i, str - buf, str[0],
	235	str + 1 - buf, str[1]);
	236	return -EINVAL;
	237	}
	238
	239	uuid[i] = (hex_to_bin(str[0]) << 4) \| hex_to_bin(str[1]);
	240	str += 2;
	241	if (is_uuid_sep(*str))
	242	str++;
	243	}
	244
	245	memcpy(uuid_out, uuid, sizeof(uuid));
	246	return 0;
	247	}
	248
	249	/**
	250	* nd_uuid_store: common implementation for writing 'uuid' sysfs attributes
	251	* @dev: container device for the uuid property
	252	* @uuid_out: uuid buffer to replace
	253	* @buf: raw sysfs buffer to parse
	254	*
	255	* Enforce that uuids can only be changed while the device is disabled
	256	* (driver detached)
	257	* LOCKING: expects device_lock() is held on entry
	258	*/
	259	int nd_uuid_store(struct device dev, u8 uuid_out, const char buf,
	260	size_t len)
	261	{
	262	u8 uuid[16];
	263	int rc;
	264
	265	if (dev->driver)
	266	return -EBUSY;
	267
	268	rc = nd_uuid_parse(dev, uuid, buf, len);
	269	if (rc)
	270	return rc;
	271
	272	kfree(*uuid_out);
	273	*uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
	274	if (!(*uuid_out))
	275	return -ENOMEM;
	276
	277	return 0;
	278	}
	279
b2c48f9f	280	ssize_t nd_size_select_show(unsigned long current_size,
1b40e09a DW	281	const unsigned long supported, char buf)
	282	{
	283	ssize_t len = 0;
	284	int i;
	285
	286	for (i = 0; supported[i]; i++)
b2c48f9f	287	if (current_size == supported[i])
1b40e09a DW	288	len += sprintf(buf + len, "[%ld] ", supported[i]);
	289	else
	290	len += sprintf(buf + len, "%ld ", supported[i]);
	291	len += sprintf(buf + len, "\n");
	292	return len;
	293	}
	294
b2c48f9f DW	295	ssize_t nd_size_select_store(struct device dev, const char buf,
b2c48f9f DW	296	unsigned long current_size, const unsigned long supported)
1b40e09a DW	297	{
	298	unsigned long lbasize;
	299	int rc, i;
	300
	301	if (dev->driver)
	302	return -EBUSY;
	303
	304	rc = kstrtoul(buf, 0, &lbasize);
	305	if (rc)
	306	return rc;
	307
	308	for (i = 0; supported[i]; i++)
	309	if (lbasize == supported[i])
	310	break;
	311
	312	if (supported[i]) {
b2c48f9f	313	*current_size = lbasize;
1b40e09a DW	314	return 0;
	315	} else {
	316	return -EINVAL;
	317	}
	318	}
	319
62232e45 DW	320	static ssize_t commands_show(struct device *dev,
	321	struct device_attribute attr, char buf)
	322	{
	323	int cmd, len = 0;
	324	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
	325	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
	326
e3654eca	327	for_each_set_bit(cmd, &nd_desc->cmd_mask, BITS_PER_LONG)
62232e45 DW	328	len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd));
	329	len += sprintf(buf + len, "\n");
	330	return len;
	331	}
	332	static DEVICE_ATTR_RO(commands);
	333
45def22c DW	334	static const char nvdimm_bus_provider(struct nvdimm_bus nvdimm_bus)
	335	{
	336	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
	337	struct device *parent = nvdimm_bus->dev.parent;
	338
	339	if (nd_desc->provider_name)
	340	return nd_desc->provider_name;
	341	else if (parent)
	342	return dev_name(parent);
	343	else
	344	return "unknown";
	345	}
	346
	347	static ssize_t provider_show(struct device *dev,
	348	struct device_attribute attr, char buf)
	349	{
	350	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
	351
	352	return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus));
	353	}
	354	static DEVICE_ATTR_RO(provider);
	355
4d88a97a DW	356	static int flush_namespaces(struct device dev, void data)
	357	{
	358	device_lock(dev);
	359	device_unlock(dev);
	360	return 0;
	361	}
	362
	363	static int flush_regions_dimms(struct device dev, void data)
	364	{
	365	device_lock(dev);
	366	device_unlock(dev);
	367	device_for_each_child(dev, NULL, flush_namespaces);
	368	return 0;
	369	}
	370
	371	static ssize_t wait_probe_show(struct device *dev,
	372	struct device_attribute attr, char buf)
	373	{
7ae0fa43 DW	374	struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
	375	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
	376	int rc;
	377
	378	if (nd_desc->flush_probe) {
	379	rc = nd_desc->flush_probe(nd_desc);
	380	if (rc)
	381	return rc;
	382	}
4d88a97a DW	383	nd_synchronize();
	384	device_for_each_child(dev, NULL, flush_regions_dimms);
	385	return sprintf(buf, "1\n");
	386	}
	387	static DEVICE_ATTR_RO(wait_probe);
	388
45def22c	389	static struct attribute *nvdimm_bus_attributes[] = {
62232e45	390	&dev_attr_commands.attr,
4d88a97a	391	&dev_attr_wait_probe.attr,
45def22c DW	392	&dev_attr_provider.attr,
	393	NULL,
	394	};
	395
	396	struct attribute_group nvdimm_bus_attribute_group = {
	397	.attrs = nvdimm_bus_attributes,
	398	};
	399	EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
	400
aa9ad44a	401	int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
87ba05df	402	{
aa9ad44a	403	return badrange_add(&nvdimm_bus->badrange, addr, length);
87ba05df	404	}
aa9ad44a	405	EXPORT_SYMBOL_GPL(nvdimm_bus_add_badrange);
e046114a	406
41cd8b70	407	#ifdef CONFIG_BLK_DEV_INTEGRITY
41cd8b70 VV	408	int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
41cd8b70 VV	409	{
0f8087ec	410	struct blk_integrity bi;
41cd8b70	411
fcae6957 VV	412	if (meta_size == 0)
	413	return 0;
	414
8729bdea JT	415	memset(&bi, 0, sizeof(bi));
8729bdea JT	416
0f8087ec MP	417	bi.tuple_size = meta_size;
	418	bi.tag_size = meta_size;
	419
25520d55	420	blk_integrity_register(disk, &bi);
41cd8b70 VV	421	blk_queue_max_integrity_segments(disk->queue, 1);
	422
	423	return 0;
	424	}
	425	EXPORT_SYMBOL(nd_integrity_init);
	426
	427	#else /* CONFIG_BLK_DEV_INTEGRITY */
	428	int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
	429	{
	430	return 0;
	431	}
	432	EXPORT_SYMBOL(nd_integrity_init);
	433
	434	#endif
	435
45def22c DW	436	static __init int libnvdimm_init(void)
45def22c DW	437	{
4d88a97a DW	438	int rc;
	439
	440	rc = nvdimm_bus_init();
	441	if (rc)
	442	return rc;
	443	rc = nvdimm_init();
	444	if (rc)
	445	goto err_dimm;
3d88002e DW	446	rc = nd_region_init();
	447	if (rc)
	448	goto err_region;
b3fde74e DW	449
	450	nd_label_init();
	451
4d88a97a	452	return 0;
3d88002e DW	453	err_region:
3d88002e DW	454	nvdimm_exit();
4d88a97a DW	455	err_dimm:
	456	nvdimm_bus_exit();
	457	return rc;
45def22c DW	458	}
	459
	460	static __exit void libnvdimm_exit(void)
	461	{
	462	WARN_ON(!list_empty(&nvdimm_bus_list));
3d88002e	463	nd_region_exit();
4d88a97a	464	nvdimm_exit();
45def22c	465	nvdimm_bus_exit();
b354aba0 DW	466	nd_region_devs_exit();
b354aba0 DW	467	nvdimm_devs_exit();
45def22c DW	468	}
45def22c DW	469
b94d5230 DW	470	MODULE_LICENSE("GPL v2");
b94d5230 DW	471	MODULE_AUTHOR("Intel Corporation");
45def22c DW	472	subsys_initcall(libnvdimm_init);
45def22c DW	473	module_exit(libnvdimm_exit);