| /* |
| * 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 (!access_ok(VERIFY_READ, p + in_len, in_size)) |
| return -EFAULT; |
| 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 (!access_ok(VERIFY_WRITE, p + in_len + out_len, out_size)) |
| 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 (!access_ok(VERIFY_WRITE, p, sizeof(buf_len))) |
| return -EFAULT; |
| |
| 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)) |
| 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); |
| } |