source: src/linux/universal/linux-4.4/drivers/nvdimm/bus.c @ 31885

Last change on this file since 31885 was 31885, checked in by brainslayer, 2 months ago

update

File size: 17.0 KB
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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
14#include <linux/vmalloc.h>
15#include <linux/uaccess.h>
16#include <linux/module.h>
17#include <linux/blkdev.h>
18#include <linux/fcntl.h>
19#include <linux/async.h>
20#include <linux/genhd.h>
21#include <linux/ndctl.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/fs.h>
25#include <linux/io.h>
26#include <linux/mm.h>
27#include <linux/nd.h>
28#include "nd-core.h"
29#include "nd.h"
30
31int nvdimm_major;
32static int nvdimm_bus_major;
33static struct class *nd_class;
34
35static int to_nd_device_type(struct device *dev)
36{
37        if (is_nvdimm(dev))
38                return ND_DEVICE_DIMM;
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));
45
46        return 0;
47}
48
49static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
50{
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);
57        return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
58                        to_nd_device_type(dev));
59}
60
61static 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
68static 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
79static 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
86static 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
94static int nvdimm_bus_probe(struct device *dev)
95{
96        struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
97        struct module *provider = to_bus_provider(dev);
98        struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
99        int rc;
100
101        if (!try_module_get(provider))
102                return -ENXIO;
103
104        nvdimm_bus_probe_start(nvdimm_bus);
105        rc = nd_drv->probe(dev);
106        if (rc == 0)
107                nd_region_probe_success(nvdimm_bus, dev);
108        else
109                nd_region_disable(nvdimm_bus, dev);
110        nvdimm_bus_probe_end(nvdimm_bus);
111
112        dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
113                        dev_name(dev), rc);
114
115        if (rc != 0)
116                module_put(provider);
117        return rc;
118}
119
120static int nvdimm_bus_remove(struct device *dev)
121{
122        struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
123        struct module *provider = to_bus_provider(dev);
124        struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
125        int rc;
126
127        rc = nd_drv->remove(dev);
128        nd_region_disable(nvdimm_bus, dev);
129
130        dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
131                        dev_name(dev), rc);
132        module_put(provider);
133        return rc;
134}
135
136static struct bus_type nvdimm_bus_type = {
137        .name = "nd",
138        .uevent = nvdimm_bus_uevent,
139        .match = nvdimm_bus_match,
140        .probe = nvdimm_bus_probe,
141        .remove = nvdimm_bus_remove,
142};
143
144static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
145
146void nd_synchronize(void)
147{
148        async_synchronize_full_domain(&nd_async_domain);
149}
150EXPORT_SYMBOL_GPL(nd_synchronize);
151
152static 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
163static void nd_async_device_unregister(void *d, async_cookie_t cookie)
164{
165        struct device *dev = d;
166
167        /* flush bus operations before delete */
168        nvdimm_bus_lock(dev);
169        nvdimm_bus_unlock(dev);
170
171        device_unregister(dev);
172        put_device(dev);
173}
174
175void __nd_device_register(struct device *dev)
176{
177        dev->bus = &nvdimm_bus_type;
178        get_device(dev);
179        async_schedule_domain(nd_async_device_register, dev,
180                        &nd_async_domain);
181}
182
183void nd_device_register(struct device *dev)
184{
185        device_initialize(dev);
186        __nd_device_register(dev);
187}
188EXPORT_SYMBOL(nd_device_register);
189
190void 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}
204EXPORT_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 */
212int __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}
234EXPORT_SYMBOL(__nd_driver_register);
235
236int 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}
252EXPORT_SYMBOL(nvdimm_revalidate_disk);
253
254static 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}
260static DEVICE_ATTR_RO(modalias);
261
262static 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}
267static DEVICE_ATTR_RO(devtype);
268
269static 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 */
278struct attribute_group nd_device_attribute_group = {
279        .attrs = nd_device_attributes,
280};
281EXPORT_SYMBOL_GPL(nd_device_attribute_group);
282
283static 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}
288static DEVICE_ATTR_RO(numa_node);
289
290static struct attribute *nd_numa_attributes[] = {
291        &dev_attr_numa_node.attr,
292        NULL,
293};
294
295static 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 */
307struct attribute_group nd_numa_attribute_group = {
308        .attrs = nd_numa_attributes,
309        .is_visible = nd_numa_attr_visible,
310};
311EXPORT_SYMBOL_GPL(nd_numa_attribute_group);
312
313int 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
329void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
330{
331        device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
332}
333
334static 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, 128, },
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
372const 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}
378EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
379
380static 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
400const 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}
406EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
407
408u32 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}
429EXPORT_SYMBOL_GPL(nd_cmd_in_size);
430
431u32 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}
450EXPORT_SYMBOL_GPL(nd_cmd_out_size);
451
452void wait_nvdimm_bus_probe_idle(struct device *dev)
453{
454        struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
455
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 */
467static 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);
475        wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
476
477        if (atomic_read(&nvdimm->busy))
478                return -EBUSY;
479        return 0;
480}
481
482static 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 (cmd) {
517                case ND_CMD_VENDOR:
518                case ND_CMD_SET_CONFIG_DATA:
519                case ND_CMD_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                }
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                }
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;
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
585        nvdimm_bus_lock(&nvdimm_bus->dev);
586        rc = nd_cmd_clear_to_send(nvdimm, cmd);
587        if (rc)
588                goto out_unlock;
589
590        rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len);
591        if (rc < 0)
592                goto out_unlock;
593        nvdimm_bus_unlock(&nvdimm_bus->dev);
594
595        if (copy_to_user(p, buf, buf_len))
596                rc = -EFAULT;
597
598        vfree(buf);
599        return rc;
600
601 out_unlock:
602        nvdimm_bus_unlock(&nvdimm_bus->dev);
603 out:
604        vfree(buf);
605        return rc;
606}
607
608static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
609{
610        long id = (long) file->private_data;
611        int rc = -ENXIO, read_only;
612        struct nvdimm_bus *nvdimm_bus;
613
614        read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
615        mutex_lock(&nvdimm_bus_list_mutex);
616        list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
617                if (nvdimm_bus->id == id) {
618                        rc = __nd_ioctl(nvdimm_bus, NULL, read_only, cmd, arg);
619                        break;
620                }
621        }
622        mutex_unlock(&nvdimm_bus_list_mutex);
623
624        return rc;
625}
626
627static int match_dimm(struct device *dev, void *data)
628{
629        long id = (long) data;
630
631        if (is_nvdimm(dev)) {
632                struct nvdimm *nvdimm = to_nvdimm(dev);
633
634                return nvdimm->id == id;
635        }
636
637        return 0;
638}
639
640static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
641{
642        int rc = -ENXIO, read_only;
643        struct nvdimm_bus *nvdimm_bus;
644
645        read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
646        mutex_lock(&nvdimm_bus_list_mutex);
647        list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
648                struct device *dev = device_find_child(&nvdimm_bus->dev,
649                                file->private_data, match_dimm);
650                struct nvdimm *nvdimm;
651
652                if (!dev)
653                        continue;
654
655                nvdimm = to_nvdimm(dev);
656                rc = __nd_ioctl(nvdimm_bus, nvdimm, read_only, cmd, arg);
657                put_device(dev);
658                break;
659        }
660        mutex_unlock(&nvdimm_bus_list_mutex);
661
662        return rc;
663}
664
665static int nd_open(struct inode *inode, struct file *file)
666{
667        long minor = iminor(inode);
668
669        file->private_data = (void *) minor;
670        return 0;
671}
672
673static const struct file_operations nvdimm_bus_fops = {
674        .owner = THIS_MODULE,
675        .open = nd_open,
676        .unlocked_ioctl = nd_ioctl,
677        .compat_ioctl = nd_ioctl,
678        .llseek = noop_llseek,
679};
680
681static const struct file_operations nvdimm_fops = {
682        .owner = THIS_MODULE,
683        .open = nd_open,
684        .unlocked_ioctl = nvdimm_ioctl,
685        .compat_ioctl = nvdimm_ioctl,
686        .llseek = noop_llseek,
687};
688
689int __init nvdimm_bus_init(void)
690{
691        int rc;
692
693        rc = bus_register(&nvdimm_bus_type);
694        if (rc)
695                return rc;
696
697        rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
698        if (rc < 0)
699                goto err_bus_chrdev;
700        nvdimm_bus_major = rc;
701
702        rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
703        if (rc < 0)
704                goto err_dimm_chrdev;
705        nvdimm_major = rc;
706
707        nd_class = class_create(THIS_MODULE, "nd");
708        if (IS_ERR(nd_class)) {
709                rc = PTR_ERR(nd_class);
710                goto err_class;
711        }
712
713        return 0;
714
715 err_class:
716        unregister_chrdev(nvdimm_major, "dimmctl");
717 err_dimm_chrdev:
718        unregister_chrdev(nvdimm_bus_major, "ndctl");
719 err_bus_chrdev:
720        bus_unregister(&nvdimm_bus_type);
721
722        return rc;
723}
724
725void nvdimm_bus_exit(void)
726{
727        class_destroy(nd_class);
728        unregister_chrdev(nvdimm_bus_major, "ndctl");
729        unregister_chrdev(nvdimm_major, "dimmctl");
730        bus_unregister(&nvdimm_bus_type);
731}
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