[linux-2.6-block.git] / drivers / nvdimm / bus.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.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/vmalloc.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/fcntl.h>
#include <linux/async.h>
#include <linux/genhd.h>
#include <linux/ndctl.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/nd.h>
#include "nd-core.h"
#include "nd.h"

int nvdimm_major;
static int nvdimm_bus_major;
static struct class *nd_class;

static int to_nd_device_type(struct device *dev)
{
	if (is_nvdimm(dev))
		return ND_DEVICE_DIMM;
	else if (is_nd_pmem(dev))
		return ND_DEVICE_REGION_PMEM;
	else if (is_nd_blk(dev))
		return ND_DEVICE_REGION_BLK;
	else if (is_nd_pmem(dev->parent) || is_nd_blk(dev->parent))
		return nd_region_to_nstype(to_nd_region(dev->parent));

	return 0;
}

static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	/*
	 * Ensure that region devices always have their numa node set as
	 * early as possible.
	 */
	if (is_nd_pmem(dev) || is_nd_blk(dev))
		set_dev_node(dev, to_nd_region(dev)->numa_node);
	return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
			to_nd_device_type(dev));
}

static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
{
	struct nd_device_driver *nd_drv = to_nd_device_driver(drv);

	return test_bit(to_nd_device_type(dev), &nd_drv->type);
}

static struct module *to_bus_provider(struct device *dev)
{
	/* pin bus providers while regions are enabled */
	if (is_nd_pmem(dev) || is_nd_blk(dev)) {
		struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

		return nvdimm_bus->module;
	}
	return NULL;
}

static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus)
{
	nvdimm_bus_lock(&nvdimm_bus->dev);
	nvdimm_bus->probe_active++;
	nvdimm_bus_unlock(&nvdimm_bus->dev);
}

static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
{
	nvdimm_bus_lock(&nvdimm_bus->dev);
	if (--nvdimm_bus->probe_active == 0)
		wake_up(&nvdimm_bus->probe_wait);
	nvdimm_bus_unlock(&nvdimm_bus->dev);
}

static int nvdimm_bus_probe(struct device *dev)
{
	struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
	struct module *provider = to_bus_provider(dev);
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	int rc;

	if (!try_module_get(provider))
		return -ENXIO;

	nvdimm_bus_probe_start(nvdimm_bus);
	rc = nd_drv->probe(dev);
	if (rc == 0)
		nd_region_probe_success(nvdimm_bus, dev);
	else
		nd_region_disable(nvdimm_bus, dev);
	nvdimm_bus_probe_end(nvdimm_bus);

	dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
			dev_name(dev), rc);

	if (rc != 0)
		module_put(provider);
	return rc;
}

static int nvdimm_bus_remove(struct device *dev)
{
	struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
	struct module *provider = to_bus_provider(dev);
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	int rc;

	rc = nd_drv->remove(dev);
	nd_region_disable(nvdimm_bus, dev);

	dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
			dev_name(dev), rc);
	module_put(provider);
	return rc;
}

static struct bus_type nvdimm_bus_type = {
	.name = "nd",
	.uevent = nvdimm_bus_uevent,
	.match = nvdimm_bus_match,
	.probe = nvdimm_bus_probe,
	.remove = nvdimm_bus_remove,
};

static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);

void nd_synchronize(void)
{
	async_synchronize_full_domain(&nd_async_domain);
}
EXPORT_SYMBOL_GPL(nd_synchronize);

static void nd_async_device_register(void *d, async_cookie_t cookie)
{
	struct device *dev = d;

	if (device_add(dev) != 0) {
		dev_err(dev, "%s: failed\n", __func__);
		put_device(dev);
	}
	put_device(dev);
}

static void nd_async_device_unregister(void *d, async_cookie_t cookie)
{
	struct device *dev = d;

	/* flush bus operations before delete */
	nvdimm_bus_lock(dev);
	nvdimm_bus_unlock(dev);

	device_unregister(dev);
	put_device(dev);
}

void __nd_device_register(struct device *dev)
{
	dev->bus = &nvdimm_bus_type;
	get_device(dev);
	async_schedule_domain(nd_async_device_register, dev,
			&nd_async_domain);
}

void nd_device_register(struct device *dev)
{
	device_initialize(dev);
	__nd_device_register(dev);
}
EXPORT_SYMBOL(nd_device_register);

void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
{
	switch (mode) {
	case ND_ASYNC:
		get_device(dev);
		async_schedule_domain(nd_async_device_unregister, dev,
				&nd_async_domain);
		break;
	case ND_SYNC:
		nd_synchronize();
		device_unregister(dev);
		break;
	}
}
EXPORT_SYMBOL(nd_device_unregister);

/**
 * __nd_driver_register() - register a region or a namespace driver
 * @nd_drv: driver to register
 * @owner: automatically set by nd_driver_register() macro
 * @mod_name: automatically set by nd_driver_register() macro
 */
int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner,
		const char *mod_name)
{
	struct device_driver *drv = &nd_drv->drv;

	if (!nd_drv->type) {
		pr_debug("driver type bitmask not set (%pf)\n",
				__builtin_return_address(0));
		return -EINVAL;
	}

	if (!nd_drv->probe || !nd_drv->remove) {
		pr_debug("->probe() and ->remove() must be specified\n");
		return -EINVAL;
	}

	drv->bus = &nvdimm_bus_type;
	drv->owner = owner;
	drv->mod_name = mod_name;

	return driver_register(drv);
}
EXPORT_SYMBOL(__nd_driver_register);

int nvdimm_revalidate_disk(struct gendisk *disk)
{
	struct device *dev = disk->driverfs_dev;
	struct nd_region *nd_region = to_nd_region(dev->parent);
	const char *pol = nd_region->ro ? "only" : "write";

	if (nd_region->ro == get_disk_ro(disk))
		return 0;

	dev_info(dev, "%s read-%s, marking %s read-%s\n",
			dev_name(&nd_region->dev), pol, disk->disk_name, pol);
	set_disk_ro(disk, nd_region->ro);

	return 0;

}
EXPORT_SYMBOL(nvdimm_revalidate_disk);

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n",
			to_nd_device_type(dev));
}
static DEVICE_ATTR_RO(modalias);

static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	return sprintf(buf, "%s\n", dev->type->name);
}
static DEVICE_ATTR_RO(devtype);

static struct attribute *nd_device_attributes[] = {
	&dev_attr_modalias.attr,
	&dev_attr_devtype.attr,
	NULL,
};

/**
 * nd_device_attribute_group - generic attributes for all devices on an nd bus
 */
struct attribute_group nd_device_attribute_group = {
	.attrs = nd_device_attributes,
};
EXPORT_SYMBOL_GPL(nd_device_attribute_group);

static ssize_t numa_node_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", dev_to_node(dev));
}
static DEVICE_ATTR_RO(numa_node);

static struct attribute *nd_numa_attributes[] = {
	&dev_attr_numa_node.attr,
	NULL,
};

static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
		int n)
{
	if (!IS_ENABLED(CONFIG_NUMA))
		return 0;

	return a->mode;
}

/**
 * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
 */
struct attribute_group nd_numa_attribute_group = {
	.attrs = nd_numa_attributes,
	.is_visible = nd_numa_attr_visible,
};
EXPORT_SYMBOL_GPL(nd_numa_attribute_group);

int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
{
	dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
	struct device *dev;

	dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus,
			"ndctl%d", nvdimm_bus->id);

	if (IS_ERR(dev)) {
		dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n",
				nvdimm_bus->id, PTR_ERR(dev));
		return PTR_ERR(dev);
	}
	return 0;
}

void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
{
	device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
}

static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
	[ND_CMD_IMPLEMENTED] = { },
	[ND_CMD_SMART] = {
		.out_num = 2,
		.out_sizes = { 4, 8, },
	},
	[ND_CMD_SMART_THRESHOLD] = {
		.out_num = 2,
		.out_sizes = { 4, 8, },
	},
	[ND_CMD_DIMM_FLAGS] = {
		.out_num = 2,
		.out_sizes = { 4, 4 },
	},
	[ND_CMD_GET_CONFIG_SIZE] = {
		.out_num = 3,
		.out_sizes = { 4, 4, 4, },
	},
	[ND_CMD_GET_CONFIG_DATA] = {
		.in_num = 2,
		.in_sizes = { 4, 4, },
		.out_num = 2,
		.out_sizes = { 4, UINT_MAX, },
	},
	[ND_CMD_SET_CONFIG_DATA] = {
		.in_num = 3,
		.in_sizes = { 4, 4, UINT_MAX, },
		.out_num = 1,
		.out_sizes = { 4, },
	},
	[ND_CMD_VENDOR] = {
		.in_num = 3,
		.in_sizes = { 4, 4, UINT_MAX, },
		.out_num = 3,
		.out_sizes = { 4, 4, UINT_MAX, },
	},
};

const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
{
	if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
		return &__nd_cmd_dimm_descs[cmd];
	return NULL;
}
EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);

static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
	[ND_CMD_IMPLEMENTED] = { },
	[ND_CMD_ARS_CAP] = {
		.in_num = 2,
		.in_sizes = { 8, 8, },
		.out_num = 2,
		.out_sizes = { 4, 4, },
	},
	[ND_CMD_ARS_START] = {
		.in_num = 4,
		.in_sizes = { 8, 8, 2, 6, },
		.out_num = 1,
		.out_sizes = { 4, },
	},
	[ND_CMD_ARS_STATUS] = {
		.out_num = 2,
		.out_sizes = { 4, UINT_MAX, },
	},
};

const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
{
	if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
		return &__nd_cmd_bus_descs[cmd];
	return NULL;
}
EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);

u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
		const struct nd_cmd_desc *desc, int idx, void *buf)
{
	if (idx >= desc->in_num)
		return UINT_MAX;

	if (desc->in_sizes[idx] < UINT_MAX)
		return desc->in_sizes[idx];

	if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
		struct nd_cmd_set_config_hdr *hdr = buf;

		return hdr->in_length;
	} else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
		struct nd_cmd_vendor_hdr *hdr = buf;

		return hdr->in_length;
	}

	return UINT_MAX;
}
EXPORT_SYMBOL_GPL(nd_cmd_in_size);

u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
		const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
		const u32 *out_field)
{
	if (idx >= desc->out_num)
		return UINT_MAX;

	if (desc->out_sizes[idx] < UINT_MAX)
		return desc->out_sizes[idx];

	if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
		return in_field[1];
	else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
		return out_field[1];
	else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 1)
		return ND_CMD_ARS_STATUS_MAX;

	return UINT_MAX;
}
EXPORT_SYMBOL_GPL(nd_cmd_out_size);

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

	do {
		if (nvdimm_bus->probe_active == 0)
			break;
		nvdimm_bus_unlock(&nvdimm_bus->dev);
		wait_event(nvdimm_bus->probe_wait,
				nvdimm_bus->probe_active == 0);
		nvdimm_bus_lock(&nvdimm_bus->dev);
	} while (true);
}

/* set_config requires an idle interleave set */
static int nd_cmd_clear_to_send(struct nvdimm *nvdimm, unsigned int cmd)
{
	struct nvdimm_bus *nvdimm_bus;

	if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
		return 0;

	nvdimm_bus = walk_to_nvdimm_bus(&nvdimm->dev);
	wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);

	if (atomic_read(&nvdimm->busy))
		return -EBUSY;
	return 0;
}

static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
		int read_only, unsigned int ioctl_cmd, unsigned long arg)
{
	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
	size_t buf_len = 0, in_len = 0, out_len = 0;
	static char out_env[ND_CMD_MAX_ENVELOPE];
	static char in_env[ND_CMD_MAX_ENVELOPE];
	const struct nd_cmd_desc *desc = NULL;
	unsigned int cmd = _IOC_NR(ioctl_cmd);
	void __user *p = (void __user *) arg;
	struct device *dev = &nvdimm_bus->dev;
	const char *cmd_name, *dimm_name;
	unsigned long dsm_mask;
	void *buf;
	int rc, i;

	if (nvdimm) {
		desc = nd_cmd_dimm_desc(cmd);
		cmd_name = nvdimm_cmd_name(cmd);
		dsm_mask = nvdimm->dsm_mask ? *(nvdimm->dsm_mask) : 0;
		dimm_name = dev_name(&nvdimm->dev);
	} else {
		desc = nd_cmd_bus_desc(cmd);
		cmd_name = nvdimm_bus_cmd_name(cmd);
		dsm_mask = nd_desc->dsm_mask;
		dimm_name = "bus";
	}

	if (!desc || (desc->out_num + desc->in_num == 0) ||
			!test_bit(cmd, &dsm_mask))
		return -ENOTTY;

	/* fail write commands (when read-only) */
	if (read_only)
		switch (ioctl_cmd) {
		case ND_IOCTL_VENDOR:
		case ND_IOCTL_SET_CONFIG_DATA:
		case ND_IOCTL_ARS_START:
			dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n",
					nvdimm ? nvdimm_cmd_name(cmd)
					: nvdimm_bus_cmd_name(cmd));
			return -EPERM;
		default:
			break;
		}

	/* process an input envelope */
	for (i = 0; i < desc->in_num; i++) {
		u32 in_size, copy;

		in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
		if (in_size == UINT_MAX) {
			dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
					__func__, dimm_name, cmd_name, i);
			return -ENXIO;
		}
		if (in_len < sizeof(in_env))
			copy = min_t(u32, sizeof(in_env) - in_len, in_size);
		else
			copy = 0;
		if (copy && copy_from_user(&in_env[in_len], p + in_len, copy))
			return -EFAULT;
		in_len += in_size;
	}

	/* process an output envelope */
	for (i = 0; i < desc->out_num; i++) {
		u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
				(u32 *) in_env, (u32 *) out_env);
		u32 copy;

		if (out_size == UINT_MAX) {
			dev_dbg(dev, "%s:%s unknown output size cmd: %s field: %d\n",
					__func__, dimm_name, cmd_name, i);
			return -EFAULT;
		}
		if (out_len < sizeof(out_env))
			copy = min_t(u32, sizeof(out_env) - out_len, out_size);
		else
			copy = 0;
		if (copy && copy_from_user(&out_env[out_len],
					p + in_len + out_len, copy))
			return -EFAULT;
		out_len += out_size;
	}

	buf_len = out_len + in_len;
	if (buf_len > ND_IOCTL_MAX_BUFLEN) {
		dev_dbg(dev, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__,
				dimm_name, cmd_name, buf_len,
				ND_IOCTL_MAX_BUFLEN);
		return -EINVAL;
	}

	buf = vmalloc(buf_len);
	if (!buf)
		return -ENOMEM;

	if (copy_from_user(buf, p, buf_len)) {
		rc = -EFAULT;
		goto out;
	}

	nvdimm_bus_lock(&nvdimm_bus->dev);
	rc = nd_cmd_clear_to_send(nvdimm, cmd);
	if (rc)
		goto out_unlock;

	rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len);
	if (rc < 0)
		goto out_unlock;
	if (copy_to_user(p, buf, buf_len))
		rc = -EFAULT;
 out_unlock:
	nvdimm_bus_unlock(&nvdimm_bus->dev);
 out:
	vfree(buf);
	return rc;
}

static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	long id = (long) file->private_data;
	int rc = -ENXIO, read_only;
	struct nvdimm_bus *nvdimm_bus;

	read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
	mutex_lock(&nvdimm_bus_list_mutex);
	list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
		if (nvdimm_bus->id == id) {
			rc = __nd_ioctl(nvdimm_bus, NULL, read_only, cmd, arg);
			break;
		}
	}
	mutex_unlock(&nvdimm_bus_list_mutex);

	return rc;
}

static int match_dimm(struct device *dev, void *data)
{
	long id = (long) data;

	if (is_nvdimm(dev)) {
		struct nvdimm *nvdimm = to_nvdimm(dev);

		return nvdimm->id == id;
	}

	return 0;
}

static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	int rc = -ENXIO, read_only;
	struct nvdimm_bus *nvdimm_bus;

	read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
	mutex_lock(&nvdimm_bus_list_mutex);
	list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
		struct device *dev = device_find_child(&nvdimm_bus->dev,
				file->private_data, match_dimm);
		struct nvdimm *nvdimm;

		if (!dev)
			continue;

		nvdimm = to_nvdimm(dev);
		rc = __nd_ioctl(nvdimm_bus, nvdimm, read_only, cmd, arg);
		put_device(dev);
		break;
	}
	mutex_unlock(&nvdimm_bus_list_mutex);

	return rc;
}

static int nd_open(struct inode *inode, struct file *file)
{
	long minor = iminor(inode);

	file->private_data = (void *) minor;
	return 0;
}

static const struct file_operations nvdimm_bus_fops = {
	.owner = THIS_MODULE,
	.open = nd_open,
	.unlocked_ioctl = nd_ioctl,
	.compat_ioctl = nd_ioctl,
	.llseek = noop_llseek,
};

static const struct file_operations nvdimm_fops = {
	.owner = THIS_MODULE,
	.open = nd_open,
	.unlocked_ioctl = nvdimm_ioctl,
	.compat_ioctl = nvdimm_ioctl,
	.llseek = noop_llseek,
};

int __init nvdimm_bus_init(void)
{
	int rc;

	rc = bus_register(&nvdimm_bus_type);
	if (rc)
		return rc;

	rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
	if (rc < 0)
		goto err_bus_chrdev;
	nvdimm_bus_major = rc;

	rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
	if (rc < 0)
		goto err_dimm_chrdev;
	nvdimm_major = rc;

	nd_class = class_create(THIS_MODULE, "nd");
	if (IS_ERR(nd_class)) {
		rc = PTR_ERR(nd_class);
		goto err_class;
	}

	return 0;

 err_class:
	unregister_chrdev(nvdimm_major, "dimmctl");
 err_dimm_chrdev:
	unregister_chrdev(nvdimm_bus_major, "ndctl");
 err_bus_chrdev:
	bus_unregister(&nvdimm_bus_type);

	return rc;
}

void nvdimm_bus_exit(void)
{
	class_destroy(nd_class);
	unregister_chrdev(nvdimm_bus_major, "ndctl");
	unregister_chrdev(nvdimm_major, "dimmctl");
	bus_unregister(&nvdimm_bus_type);
}
Commit	Line	Data
45def22c 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	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
62232e45	14	#include <linux/vmalloc.h>
45def22c	15	#include <linux/uaccess.h>
3d88002e	16	#include <linux/module.h>
8c2f7e86	17	#include <linux/blkdev.h>
45def22c	18	#include <linux/fcntl.h>
e6dfb2de	19	#include <linux/async.h>
8c2f7e86	20	#include <linux/genhd.h>
62232e45	21	#include <linux/ndctl.h>
4d88a97a	22	#include <linux/sched.h>
45def22c DW	23	#include <linux/slab.h>
	24	#include <linux/fs.h>
	25	#include <linux/io.h>
62232e45	26	#include <linux/mm.h>
4d88a97a	27	#include <linux/nd.h>
45def22c	28	#include "nd-core.h"
4d88a97a	29	#include "nd.h"
45def22c	30
62232e45	31	int nvdimm_major;
45def22c DW	32	static int nvdimm_bus_major;
	33	static struct class *nd_class;
	34
4d88a97a DW	35	static int to_nd_device_type(struct device *dev)
	36	{
	37	if (is_nvdimm(dev))
	38	return ND_DEVICE_DIMM;
3d88002e DW	39	else if (is_nd_pmem(dev))
	40	return ND_DEVICE_REGION_PMEM;
	41	else if (is_nd_blk(dev))
	42	return ND_DEVICE_REGION_BLK;
	43	else if (is_nd_pmem(dev->parent) \|\| is_nd_blk(dev->parent))
	44	return nd_region_to_nstype(to_nd_region(dev->parent));
4d88a97a DW	45
	46	return 0;
	47	}
	48
	49	static int nvdimm_bus_uevent(struct device dev, struct kobj_uevent_env env)
	50	{
41d7a6d6 TK	51	/*
	52	* Ensure that region devices always have their numa node set as
	53	* early as possible.
	54	*/
	55	if (is_nd_pmem(dev) \|\| is_nd_blk(dev))
	56	set_dev_node(dev, to_nd_region(dev)->numa_node);
4d88a97a DW	57	return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
	58	to_nd_device_type(dev));
	59	}
	60
	61	static int nvdimm_bus_match(struct device dev, struct device_driver drv)
	62	{
	63	struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
	64
	65	return test_bit(to_nd_device_type(dev), &nd_drv->type);
	66	}
	67
3d88002e DW	68	static struct module to_bus_provider(struct device dev)
	69	{
	70	/* pin bus providers while regions are enabled */
	71	if (is_nd_pmem(dev) \|\| is_nd_blk(dev)) {
	72	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	73
	74	return nvdimm_bus->module;
	75	}
	76	return NULL;
	77	}
	78
eaf96153 DW	79	static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus)
	80	{
	81	nvdimm_bus_lock(&nvdimm_bus->dev);
	82	nvdimm_bus->probe_active++;
	83	nvdimm_bus_unlock(&nvdimm_bus->dev);
	84	}
	85
	86	static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
	87	{
	88	nvdimm_bus_lock(&nvdimm_bus->dev);
	89	if (--nvdimm_bus->probe_active == 0)
	90	wake_up(&nvdimm_bus->probe_wait);
	91	nvdimm_bus_unlock(&nvdimm_bus->dev);
	92	}
	93
4d88a97a DW	94	static int nvdimm_bus_probe(struct device *dev)
	95	{
	96	struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
3d88002e	97	struct module *provider = to_bus_provider(dev);
4d88a97a DW	98	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	99	int rc;
	100
3d88002e DW	101	if (!try_module_get(provider))
	102	return -ENXIO;
	103
eaf96153	104	nvdimm_bus_probe_start(nvdimm_bus);
4d88a97a	105	rc = nd_drv->probe(dev);
eaf96153 DW	106	if (rc == 0)
eaf96153 DW	107	nd_region_probe_success(nvdimm_bus, dev);
bf9bccc1 DW	108	else
bf9bccc1 DW	109	nd_region_disable(nvdimm_bus, dev);
eaf96153 DW	110	nvdimm_bus_probe_end(nvdimm_bus);
eaf96153 DW	111
4d88a97a DW	112	dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
4d88a97a DW	113	dev_name(dev), rc);
8c2f7e86	114
3d88002e DW	115	if (rc != 0)
3d88002e DW	116	module_put(provider);
4d88a97a DW	117	return rc;
	118	}
	119
	120	static int nvdimm_bus_remove(struct device *dev)
	121	{
	122	struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
3d88002e	123	struct module *provider = to_bus_provider(dev);
4d88a97a DW	124	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	125	int rc;
	126
	127	rc = nd_drv->remove(dev);
eaf96153 DW	128	nd_region_disable(nvdimm_bus, dev);
eaf96153 DW	129
4d88a97a DW	130	dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
4d88a97a DW	131	dev_name(dev), rc);
3d88002e	132	module_put(provider);
4d88a97a DW	133	return rc;
	134	}
	135
	136	static struct bus_type nvdimm_bus_type = {
e6dfb2de	137	.name = "nd",
4d88a97a DW	138	.uevent = nvdimm_bus_uevent,
	139	.match = nvdimm_bus_match,
	140	.probe = nvdimm_bus_probe,
	141	.remove = nvdimm_bus_remove,
	142	};
	143
	144	static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
	145
	146	void nd_synchronize(void)
	147	{
	148	async_synchronize_full_domain(&nd_async_domain);
	149	}
	150	EXPORT_SYMBOL_GPL(nd_synchronize);
	151
	152	static void nd_async_device_register(void *d, async_cookie_t cookie)
	153	{
	154	struct device *dev = d;
	155
	156	if (device_add(dev) != 0) {
	157	dev_err(dev, "%s: failed\n", __func__);
	158	put_device(dev);
	159	}
	160	put_device(dev);
	161	}
	162
	163	static void nd_async_device_unregister(void *d, async_cookie_t cookie)
	164	{
	165	struct device *dev = d;
	166
0ba1c634 DW	167	/* flush bus operations before delete */
	168	nvdimm_bus_lock(dev);
	169	nvdimm_bus_unlock(dev);
	170
4d88a97a DW	171	device_unregister(dev);
	172	put_device(dev);
	173	}
	174
8c2f7e86	175	void __nd_device_register(struct device *dev)
4d88a97a DW	176	{
4d88a97a DW	177	dev->bus = &nvdimm_bus_type;
4d88a97a DW	178	get_device(dev);
	179	async_schedule_domain(nd_async_device_register, dev,
	180	&nd_async_domain);
	181	}
8c2f7e86 DW	182
	183	void nd_device_register(struct device *dev)
	184	{
	185	device_initialize(dev);
	186	__nd_device_register(dev);
	187	}
4d88a97a DW	188	EXPORT_SYMBOL(nd_device_register);
	189
	190	void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
	191	{
	192	switch (mode) {
	193	case ND_ASYNC:
	194	get_device(dev);
	195	async_schedule_domain(nd_async_device_unregister, dev,
	196	&nd_async_domain);
	197	break;
	198	case ND_SYNC:
	199	nd_synchronize();
	200	device_unregister(dev);
	201	break;
	202	}
	203	}
	204	EXPORT_SYMBOL(nd_device_unregister);
	205
	206	/**
	207	* __nd_driver_register() - register a region or a namespace driver
	208	* @nd_drv: driver to register
	209	* @owner: automatically set by nd_driver_register() macro
	210	* @mod_name: automatically set by nd_driver_register() macro
	211	*/
	212	int __nd_driver_register(struct nd_device_driver nd_drv, struct module owner,
	213	const char *mod_name)
	214	{
	215	struct device_driver *drv = &nd_drv->drv;
	216
	217	if (!nd_drv->type) {
	218	pr_debug("driver type bitmask not set (%pf)\n",
	219	__builtin_return_address(0));
	220	return -EINVAL;
	221	}
	222
	223	if (!nd_drv->probe \|\| !nd_drv->remove) {
	224	pr_debug("->probe() and ->remove() must be specified\n");
	225	return -EINVAL;
	226	}
	227
	228	drv->bus = &nvdimm_bus_type;
	229	drv->owner = owner;
	230	drv->mod_name = mod_name;
	231
	232	return driver_register(drv);
	233	}
	234	EXPORT_SYMBOL(__nd_driver_register);
	235
58138820 DW	236	int nvdimm_revalidate_disk(struct gendisk *disk)
	237	{
	238	struct device *dev = disk->driverfs_dev;
	239	struct nd_region *nd_region = to_nd_region(dev->parent);
	240	const char *pol = nd_region->ro ? "only" : "write";
	241
	242	if (nd_region->ro == get_disk_ro(disk))
	243	return 0;
	244
	245	dev_info(dev, "%s read-%s, marking %s read-%s\n",
	246	dev_name(&nd_region->dev), pol, disk->disk_name, pol);
	247	set_disk_ro(disk, nd_region->ro);
	248
	249	return 0;
	250
	251	}
	252	EXPORT_SYMBOL(nvdimm_revalidate_disk);
	253
4d88a97a DW	254	static ssize_t modalias_show(struct device dev, struct device_attribute attr,
	255	char *buf)
	256	{
	257	return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n",
	258	to_nd_device_type(dev));
	259	}
	260	static DEVICE_ATTR_RO(modalias);
	261
	262	static ssize_t devtype_show(struct device dev, struct device_attribute attr,
	263	char *buf)
	264	{
	265	return sprintf(buf, "%s\n", dev->type->name);
	266	}
	267	static DEVICE_ATTR_RO(devtype);
	268
	269	static struct attribute *nd_device_attributes[] = {
	270	&dev_attr_modalias.attr,
	271	&dev_attr_devtype.attr,
	272	NULL,
	273	};
	274
	275	/**
	276	* nd_device_attribute_group - generic attributes for all devices on an nd bus
	277	*/
	278	struct attribute_group nd_device_attribute_group = {
	279	.attrs = nd_device_attributes,
e6dfb2de	280	};
4d88a97a	281	EXPORT_SYMBOL_GPL(nd_device_attribute_group);
e6dfb2de	282
74ae66c3 TK	283	static ssize_t numa_node_show(struct device *dev,
	284	struct device_attribute attr, char buf)
	285	{
	286	return sprintf(buf, "%d\n", dev_to_node(dev));
	287	}
	288	static DEVICE_ATTR_RO(numa_node);
	289
	290	static struct attribute *nd_numa_attributes[] = {
	291	&dev_attr_numa_node.attr,
	292	NULL,
	293	};
	294
	295	static umode_t nd_numa_attr_visible(struct kobject kobj, struct attribute a,
	296	int n)
	297	{
	298	if (!IS_ENABLED(CONFIG_NUMA))
	299	return 0;
	300
	301	return a->mode;
	302	}
	303
	304	/**
	305	* nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
	306	*/
	307	struct attribute_group nd_numa_attribute_group = {
	308	.attrs = nd_numa_attributes,
	309	.is_visible = nd_numa_attr_visible,
	310	};
	311	EXPORT_SYMBOL_GPL(nd_numa_attribute_group);
	312
45def22c DW	313	int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
	314	{
	315	dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
	316	struct device *dev;
	317
	318	dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus,
	319	"ndctl%d", nvdimm_bus->id);
	320
	321	if (IS_ERR(dev)) {
	322	dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n",
	323	nvdimm_bus->id, PTR_ERR(dev));
	324	return PTR_ERR(dev);
	325	}
	326	return 0;
	327	}
	328
	329	void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
	330	{
	331	device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
	332	}
	333
62232e45 DW	334	static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
	335	[ND_CMD_IMPLEMENTED] = { },
	336	[ND_CMD_SMART] = {
	337	.out_num = 2,
	338	.out_sizes = { 4, 8, },
	339	},
	340	[ND_CMD_SMART_THRESHOLD] = {
	341	.out_num = 2,
	342	.out_sizes = { 4, 8, },
	343	},
	344	[ND_CMD_DIMM_FLAGS] = {
	345	.out_num = 2,
	346	.out_sizes = { 4, 4 },
	347	},
	348	[ND_CMD_GET_CONFIG_SIZE] = {
	349	.out_num = 3,
	350	.out_sizes = { 4, 4, 4, },
	351	},
	352	[ND_CMD_GET_CONFIG_DATA] = {
	353	.in_num = 2,
	354	.in_sizes = { 4, 4, },
	355	.out_num = 2,
	356	.out_sizes = { 4, UINT_MAX, },
	357	},
	358	[ND_CMD_SET_CONFIG_DATA] = {
	359	.in_num = 3,
	360	.in_sizes = { 4, 4, UINT_MAX, },
	361	.out_num = 1,
	362	.out_sizes = { 4, },
	363	},
	364	[ND_CMD_VENDOR] = {
	365	.in_num = 3,
	366	.in_sizes = { 4, 4, UINT_MAX, },
	367	.out_num = 3,
	368	.out_sizes = { 4, 4, UINT_MAX, },
	369	},
	370	};
	371
	372	const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
	373	{
	374	if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
	375	return &__nd_cmd_dimm_descs[cmd];
	376	return NULL;
	377	}
	378	EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
	379
	380	static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
	381	[ND_CMD_IMPLEMENTED] = { },
	382	[ND_CMD_ARS_CAP] = {
	383	.in_num = 2,
	384	.in_sizes = { 8, 8, },
	385	.out_num = 2,
	386	.out_sizes = { 4, 4, },
	387	},
	388	[ND_CMD_ARS_START] = {
	389	.in_num = 4,
	390	.in_sizes = { 8, 8, 2, 6, },
	391	.out_num = 1,
	392	.out_sizes = { 4, },
	393	},
	394	[ND_CMD_ARS_STATUS] = {
	395	.out_num = 2,
	396	.out_sizes = { 4, UINT_MAX, },
	397	},
398	};
399
400	const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
401	{
402	if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
403	return &__nd_cmd_bus_descs[cmd];
404	return NULL;
405	}
406	EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
407
408	u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
409	const struct nd_cmd_desc desc, int idx, void buf)
410	{
411	if (idx >= desc->in_num)
412	return UINT_MAX;
413
414	if (desc->in_sizes[idx] < UINT_MAX)
415	return desc->in_sizes[idx];
416
417	if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
418	struct nd_cmd_set_config_hdr *hdr = buf;
419
420	return hdr->in_length;
421	} else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
422	struct nd_cmd_vendor_hdr *hdr = buf;
423
424	return hdr->in_length;
425	}
426
427	return UINT_MAX;
428	}
429	EXPORT_SYMBOL_GPL(nd_cmd_in_size);
430
431	u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
432	const struct nd_cmd_desc desc, int idx, const u32 in_field,
433	const u32 *out_field)
434	{
435	if (idx >= desc->out_num)
436	return UINT_MAX;
437
438	if (desc->out_sizes[idx] < UINT_MAX)
439	return desc->out_sizes[idx];
440
441	if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
442	return in_field[1];
443	else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
444	return out_field[1];
445	else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 1)
446	return ND_CMD_ARS_STATUS_MAX;
447
448	return UINT_MAX;
449	}
450	EXPORT_SYMBOL_GPL(nd_cmd_out_size);
451
bf9bccc1	452	void wait_nvdimm_bus_probe_idle(struct device *dev)
eaf96153	453	{
bf9bccc1 DW	454	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
bf9bccc1 DW	455
eaf96153 DW	456	do {
	457	if (nvdimm_bus->probe_active == 0)
	458	break;
	459	nvdimm_bus_unlock(&nvdimm_bus->dev);
	460	wait_event(nvdimm_bus->probe_wait,
	461	nvdimm_bus->probe_active == 0);
	462	nvdimm_bus_lock(&nvdimm_bus->dev);
	463	} while (true);
	464	}
	465
	466	/* set_config requires an idle interleave set */
	467	static int nd_cmd_clear_to_send(struct nvdimm *nvdimm, unsigned int cmd)
	468	{
	469	struct nvdimm_bus *nvdimm_bus;
	470
	471	if (!nvdimm \|\| cmd != ND_CMD_SET_CONFIG_DATA)
	472	return 0;
	473
	474	nvdimm_bus = walk_to_nvdimm_bus(&nvdimm->dev);
bf9bccc1	475	wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
eaf96153 DW	476
	477	if (atomic_read(&nvdimm->busy))
	478	return -EBUSY;
	479	return 0;
	480	}
	481
62232e45 DW	482	static int __nd_ioctl(struct nvdimm_bus nvdimm_bus, struct nvdimm nvdimm,
	483	int read_only, unsigned int ioctl_cmd, unsigned long arg)
	484	{
	485	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
	486	size_t buf_len = 0, in_len = 0, out_len = 0;
	487	static char out_env[ND_CMD_MAX_ENVELOPE];
	488	static char in_env[ND_CMD_MAX_ENVELOPE];
	489	const struct nd_cmd_desc *desc = NULL;
	490	unsigned int cmd = _IOC_NR(ioctl_cmd);
	491	void __user p = (void __user ) arg;
	492	struct device *dev = &nvdimm_bus->dev;
	493	const char cmd_name, dimm_name;
	494	unsigned long dsm_mask;
	495	void *buf;
	496	int rc, i;
	497
	498	if (nvdimm) {
	499	desc = nd_cmd_dimm_desc(cmd);
	500	cmd_name = nvdimm_cmd_name(cmd);
	501	dsm_mask = nvdimm->dsm_mask ? *(nvdimm->dsm_mask) : 0;
	502	dimm_name = dev_name(&nvdimm->dev);
	503	} else {
	504	desc = nd_cmd_bus_desc(cmd);
	505	cmd_name = nvdimm_bus_cmd_name(cmd);
	506	dsm_mask = nd_desc->dsm_mask;
	507	dimm_name = "bus";
	508	}
	509
	510	if (!desc \|\| (desc->out_num + desc->in_num == 0) \|\|
	511	!test_bit(cmd, &dsm_mask))
	512	return -ENOTTY;
	513
	514	/* fail write commands (when read-only) */
	515	if (read_only)
	516	switch (ioctl_cmd) {
	517	case ND_IOCTL_VENDOR:
	518	case ND_IOCTL_SET_CONFIG_DATA:
	519	case ND_IOCTL_ARS_START:
	520	dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n",
	521	nvdimm ? nvdimm_cmd_name(cmd)
	522	: nvdimm_bus_cmd_name(cmd));
	523	return -EPERM;
	524	default:
	525	break;
	526	}
	527
	528	/* process an input envelope */
	529	for (i = 0; i < desc->in_num; i++) {
	530	u32 in_size, copy;
	531
	532	in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
	533	if (in_size == UINT_MAX) {
	534	dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
	535	__func__, dimm_name, cmd_name, i);
	536	return -ENXIO;
	537	}
62232e45 DW	538	if (in_len < sizeof(in_env))
	539	copy = min_t(u32, sizeof(in_env) - in_len, in_size);
	540	else
	541	copy = 0;
	542	if (copy && copy_from_user(&in_env[in_len], p + in_len, copy))
	543	return -EFAULT;
	544	in_len += in_size;
	545	}
	546
	547	/* process an output envelope */
	548	for (i = 0; i < desc->out_num; i++) {
	549	u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
	550	(u32 ) in_env, (u32 ) out_env);
	551	u32 copy;
	552
	553	if (out_size == UINT_MAX) {
	554	dev_dbg(dev, "%s:%s unknown output size cmd: %s field: %d\n",
	555	__func__, dimm_name, cmd_name, i);
	556	return -EFAULT;
	557	}
62232e45 DW	558	if (out_len < sizeof(out_env))
	559	copy = min_t(u32, sizeof(out_env) - out_len, out_size);
	560	else
	561	copy = 0;
	562	if (copy && copy_from_user(&out_env[out_len],
	563	p + in_len + out_len, copy))
	564	return -EFAULT;
	565	out_len += out_size;
	566	}
	567
	568	buf_len = out_len + in_len;
62232e45 DW	569	if (buf_len > ND_IOCTL_MAX_BUFLEN) {
	570	dev_dbg(dev, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__,
	571	dimm_name, cmd_name, buf_len,
	572	ND_IOCTL_MAX_BUFLEN);
	573	return -EINVAL;
	574	}
	575
	576	buf = vmalloc(buf_len);
	577	if (!buf)
	578	return -ENOMEM;
	579
	580	if (copy_from_user(buf, p, buf_len)) {
	581	rc = -EFAULT;
	582	goto out;
	583	}
	584
eaf96153 DW	585	nvdimm_bus_lock(&nvdimm_bus->dev);
	586	rc = nd_cmd_clear_to_send(nvdimm, cmd);
	587	if (rc)
	588	goto out_unlock;
	589
62232e45 DW	590	rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len);
62232e45 DW	591	if (rc < 0)
eaf96153	592	goto out_unlock;
62232e45 DW	593	if (copy_to_user(p, buf, buf_len))
62232e45 DW	594	rc = -EFAULT;
eaf96153 DW	595	out_unlock:
eaf96153 DW	596	nvdimm_bus_unlock(&nvdimm_bus->dev);
62232e45 DW	597	out:
	598	vfree(buf);
	599	return rc;
	600	}
	601
45def22c DW	602	static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
45def22c DW	603	{
62232e45 DW	604	long id = (long) file->private_data;
	605	int rc = -ENXIO, read_only;
	606	struct nvdimm_bus *nvdimm_bus;
	607
	608	read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
	609	mutex_lock(&nvdimm_bus_list_mutex);
	610	list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
	611	if (nvdimm_bus->id == id) {
	612	rc = __nd_ioctl(nvdimm_bus, NULL, read_only, cmd, arg);
	613	break;
	614	}
	615	}
	616	mutex_unlock(&nvdimm_bus_list_mutex);
	617
	618	return rc;
	619	}
	620
	621	static int match_dimm(struct device dev, void data)
	622	{
	623	long id = (long) data;
	624
	625	if (is_nvdimm(dev)) {
	626	struct nvdimm *nvdimm = to_nvdimm(dev);
	627
	628	return nvdimm->id == id;
	629	}
	630
	631	return 0;
	632	}
	633
	634	static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	635	{
	636	int rc = -ENXIO, read_only;
	637	struct nvdimm_bus *nvdimm_bus;
	638
	639	read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
	640	mutex_lock(&nvdimm_bus_list_mutex);
	641	list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
	642	struct device *dev = device_find_child(&nvdimm_bus->dev,
	643	file->private_data, match_dimm);
	644	struct nvdimm *nvdimm;
	645
	646	if (!dev)
	647	continue;
	648
	649	nvdimm = to_nvdimm(dev);
	650	rc = __nd_ioctl(nvdimm_bus, nvdimm, read_only, cmd, arg);
	651	put_device(dev);
	652	break;
	653	}
	654	mutex_unlock(&nvdimm_bus_list_mutex);
	655
	656	return rc;
	657	}
	658
	659	static int nd_open(struct inode inode, struct file file)
	660	{
	661	long minor = iminor(inode);
	662
	663	file->private_data = (void *) minor;
	664	return 0;
45def22c DW	665	}
	666
	667	static const struct file_operations nvdimm_bus_fops = {
	668	.owner = THIS_MODULE,
62232e45	669	.open = nd_open,
45def22c DW	670	.unlocked_ioctl = nd_ioctl,
	671	.compat_ioctl = nd_ioctl,
	672	.llseek = noop_llseek,
	673	};
	674
62232e45 DW	675	static const struct file_operations nvdimm_fops = {
	676	.owner = THIS_MODULE,
	677	.open = nd_open,
	678	.unlocked_ioctl = nvdimm_ioctl,
	679	.compat_ioctl = nvdimm_ioctl,
	680	.llseek = noop_llseek,
	681	};
	682
45def22c DW	683	int __init nvdimm_bus_init(void)
	684	{
	685	int rc;
	686
e6dfb2de DW	687	rc = bus_register(&nvdimm_bus_type);
	688	if (rc)
	689	return rc;
	690
45def22c DW	691	rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
45def22c DW	692	if (rc < 0)
62232e45	693	goto err_bus_chrdev;
45def22c DW	694	nvdimm_bus_major = rc;
45def22c DW	695
62232e45 DW	696	rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
	697	if (rc < 0)
	698	goto err_dimm_chrdev;
	699	nvdimm_major = rc;
	700
45def22c	701	nd_class = class_create(THIS_MODULE, "nd");
daa1dee4 AL	702	if (IS_ERR(nd_class)) {
daa1dee4 AL	703	rc = PTR_ERR(nd_class);
45def22c	704	goto err_class;
daa1dee4	705	}
45def22c DW	706
	707	return 0;
	708
	709	err_class:
62232e45 DW	710	unregister_chrdev(nvdimm_major, "dimmctl");
62232e45 DW	711	err_dimm_chrdev:
45def22c	712	unregister_chrdev(nvdimm_bus_major, "ndctl");
62232e45	713	err_bus_chrdev:
e6dfb2de	714	bus_unregister(&nvdimm_bus_type);
45def22c DW	715
	716	return rc;
	717	}
	718
4d88a97a	719	void nvdimm_bus_exit(void)
45def22c DW	720	{
	721	class_destroy(nd_class);
	722	unregister_chrdev(nvdimm_bus_major, "ndctl");
62232e45	723	unregister_chrdev(nvdimm_major, "dimmctl");
e6dfb2de	724	bus_unregister(&nvdimm_bus_type);
45def22c	725	}