--- /dev/null
+/*
+ * 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);
+}
Code Review / kvmfornfv.git / blobdiff