2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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.
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.
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>
32 static int nvdimm_bus_major
;
33 static struct class *nd_class
;
35 static int to_nd_device_type(struct device
*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_dax(dev
))
44 return ND_DEVICE_DAX_PMEM
;
45 else if (is_nd_pmem(dev
->parent
) || is_nd_blk(dev
->parent
))
46 return nd_region_to_nstype(to_nd_region(dev
->parent
));
51 static int nvdimm_bus_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
54 * Ensure that region devices always have their numa node set as
57 if (is_nd_pmem(dev
) || is_nd_blk(dev
))
58 set_dev_node(dev
, to_nd_region(dev
)->numa_node
);
59 return add_uevent_var(env
, "MODALIAS=" ND_DEVICE_MODALIAS_FMT
,
60 to_nd_device_type(dev
));
63 static int nvdimm_bus_match(struct device
*dev
, struct device_driver
*drv
)
65 struct nd_device_driver
*nd_drv
= to_nd_device_driver(drv
);
67 return !!test_bit(to_nd_device_type(dev
), &nd_drv
->type
);
70 static struct module
*to_bus_provider(struct device
*dev
)
72 /* pin bus providers while regions are enabled */
73 if (is_nd_pmem(dev
) || is_nd_blk(dev
)) {
74 struct nvdimm_bus
*nvdimm_bus
= walk_to_nvdimm_bus(dev
);
76 return nvdimm_bus
->module
;
81 static void nvdimm_bus_probe_start(struct nvdimm_bus
*nvdimm_bus
)
83 nvdimm_bus_lock(&nvdimm_bus
->dev
);
84 nvdimm_bus
->probe_active
++;
85 nvdimm_bus_unlock(&nvdimm_bus
->dev
);
88 static void nvdimm_bus_probe_end(struct nvdimm_bus
*nvdimm_bus
)
90 nvdimm_bus_lock(&nvdimm_bus
->dev
);
91 if (--nvdimm_bus
->probe_active
== 0)
92 wake_up(&nvdimm_bus
->probe_wait
);
93 nvdimm_bus_unlock(&nvdimm_bus
->dev
);
96 static int nvdimm_bus_probe(struct device
*dev
)
98 struct nd_device_driver
*nd_drv
= to_nd_device_driver(dev
->driver
);
99 struct module
*provider
= to_bus_provider(dev
);
100 struct nvdimm_bus
*nvdimm_bus
= walk_to_nvdimm_bus(dev
);
103 if (!try_module_get(provider
))
106 nvdimm_bus_probe_start(nvdimm_bus
);
107 rc
= nd_drv
->probe(dev
);
109 nd_region_probe_success(nvdimm_bus
, dev
);
111 nd_region_disable(nvdimm_bus
, dev
);
112 nvdimm_bus_probe_end(nvdimm_bus
);
114 dev_dbg(&nvdimm_bus
->dev
, "%s.probe(%s) = %d\n", dev
->driver
->name
,
118 module_put(provider
);
122 static int nvdimm_bus_remove(struct device
*dev
)
124 struct nd_device_driver
*nd_drv
= to_nd_device_driver(dev
->driver
);
125 struct module
*provider
= to_bus_provider(dev
);
126 struct nvdimm_bus
*nvdimm_bus
= walk_to_nvdimm_bus(dev
);
130 rc
= nd_drv
->remove(dev
);
131 nd_region_disable(nvdimm_bus
, dev
);
133 dev_dbg(&nvdimm_bus
->dev
, "%s.remove(%s) = %d\n", dev
->driver
->name
,
135 module_put(provider
);
139 void nd_device_notify(struct device
*dev
, enum nvdimm_event event
)
143 struct nd_device_driver
*nd_drv
;
145 nd_drv
= to_nd_device_driver(dev
->driver
);
147 nd_drv
->notify(dev
, event
);
151 EXPORT_SYMBOL(nd_device_notify
);
153 void nvdimm_region_notify(struct nd_region
*nd_region
, enum nvdimm_event event
)
155 struct nvdimm_bus
*nvdimm_bus
= walk_to_nvdimm_bus(&nd_region
->dev
);
160 /* caller is responsible for holding a reference on the device */
161 nd_device_notify(&nd_region
->dev
, event
);
163 EXPORT_SYMBOL_GPL(nvdimm_region_notify
);
165 long nvdimm_clear_poison(struct device
*dev
, phys_addr_t phys
,
168 struct nvdimm_bus
*nvdimm_bus
= walk_to_nvdimm_bus(dev
);
169 struct nvdimm_bus_descriptor
*nd_desc
;
170 struct nd_cmd_clear_error clear_err
;
171 struct nd_cmd_ars_cap ars_cap
;
172 u32 clear_err_unit
, mask
;
178 nd_desc
= nvdimm_bus
->nd_desc
;
182 memset(&ars_cap
, 0, sizeof(ars_cap
));
183 ars_cap
.address
= phys
;
184 ars_cap
.length
= len
;
185 rc
= nd_desc
->ndctl(nd_desc
, NULL
, ND_CMD_ARS_CAP
, &ars_cap
,
186 sizeof(ars_cap
), &cmd_rc
);
191 clear_err_unit
= ars_cap
.clear_err_unit
;
192 if (!clear_err_unit
|| !is_power_of_2(clear_err_unit
))
195 mask
= clear_err_unit
- 1;
196 if ((phys
| len
) & mask
)
198 memset(&clear_err
, 0, sizeof(clear_err
));
199 clear_err
.address
= phys
;
200 clear_err
.length
= len
;
201 rc
= nd_desc
->ndctl(nd_desc
, NULL
, ND_CMD_CLEAR_ERROR
, &clear_err
,
202 sizeof(clear_err
), &cmd_rc
);
207 return clear_err
.cleared
;
209 EXPORT_SYMBOL_GPL(nvdimm_clear_poison
);
211 static struct bus_type nvdimm_bus_type
= {
213 .uevent
= nvdimm_bus_uevent
,
214 .match
= nvdimm_bus_match
,
215 .probe
= nvdimm_bus_probe
,
216 .remove
= nvdimm_bus_remove
,
219 static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain
);
221 void nd_synchronize(void)
223 async_synchronize_full_domain(&nd_async_domain
);
225 EXPORT_SYMBOL_GPL(nd_synchronize
);
227 static void nd_async_device_register(void *d
, async_cookie_t cookie
)
229 struct device
*dev
= d
;
231 if (device_add(dev
) != 0) {
232 dev_err(dev
, "%s: failed\n", __func__
);
238 static void nd_async_device_unregister(void *d
, async_cookie_t cookie
)
240 struct device
*dev
= d
;
242 /* flush bus operations before delete */
243 nvdimm_bus_lock(dev
);
244 nvdimm_bus_unlock(dev
);
246 device_unregister(dev
);
250 void __nd_device_register(struct device
*dev
)
254 dev
->bus
= &nvdimm_bus_type
;
256 async_schedule_domain(nd_async_device_register
, dev
,
260 void nd_device_register(struct device
*dev
)
262 device_initialize(dev
);
263 __nd_device_register(dev
);
265 EXPORT_SYMBOL(nd_device_register
);
267 void nd_device_unregister(struct device
*dev
, enum nd_async_mode mode
)
272 async_schedule_domain(nd_async_device_unregister
, dev
,
277 device_unregister(dev
);
281 EXPORT_SYMBOL(nd_device_unregister
);
284 * __nd_driver_register() - register a region or a namespace driver
285 * @nd_drv: driver to register
286 * @owner: automatically set by nd_driver_register() macro
287 * @mod_name: automatically set by nd_driver_register() macro
289 int __nd_driver_register(struct nd_device_driver
*nd_drv
, struct module
*owner
,
290 const char *mod_name
)
292 struct device_driver
*drv
= &nd_drv
->drv
;
295 pr_debug("driver type bitmask not set (%pf)\n",
296 __builtin_return_address(0));
300 if (!nd_drv
->probe
) {
301 pr_debug("%s ->probe() must be specified\n", mod_name
);
305 drv
->bus
= &nvdimm_bus_type
;
307 drv
->mod_name
= mod_name
;
309 return driver_register(drv
);
311 EXPORT_SYMBOL(__nd_driver_register
);
313 int nvdimm_revalidate_disk(struct gendisk
*disk
)
315 struct device
*dev
= disk
->driverfs_dev
;
316 struct nd_region
*nd_region
= to_nd_region(dev
->parent
);
317 const char *pol
= nd_region
->ro
? "only" : "write";
319 if (nd_region
->ro
== get_disk_ro(disk
))
322 dev_info(dev
, "%s read-%s, marking %s read-%s\n",
323 dev_name(&nd_region
->dev
), pol
, disk
->disk_name
, pol
);
324 set_disk_ro(disk
, nd_region
->ro
);
329 EXPORT_SYMBOL(nvdimm_revalidate_disk
);
331 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
,
334 return sprintf(buf
, ND_DEVICE_MODALIAS_FMT
"\n",
335 to_nd_device_type(dev
));
337 static DEVICE_ATTR_RO(modalias
);
339 static ssize_t
devtype_show(struct device
*dev
, struct device_attribute
*attr
,
342 return sprintf(buf
, "%s\n", dev
->type
->name
);
344 static DEVICE_ATTR_RO(devtype
);
346 static struct attribute
*nd_device_attributes
[] = {
347 &dev_attr_modalias
.attr
,
348 &dev_attr_devtype
.attr
,
353 * nd_device_attribute_group - generic attributes for all devices on an nd bus
355 struct attribute_group nd_device_attribute_group
= {
356 .attrs
= nd_device_attributes
,
358 EXPORT_SYMBOL_GPL(nd_device_attribute_group
);
360 static ssize_t
numa_node_show(struct device
*dev
,
361 struct device_attribute
*attr
, char *buf
)
363 return sprintf(buf
, "%d\n", dev_to_node(dev
));
365 static DEVICE_ATTR_RO(numa_node
);
367 static struct attribute
*nd_numa_attributes
[] = {
368 &dev_attr_numa_node
.attr
,
372 static umode_t
nd_numa_attr_visible(struct kobject
*kobj
, struct attribute
*a
,
375 if (!IS_ENABLED(CONFIG_NUMA
))
382 * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
384 struct attribute_group nd_numa_attribute_group
= {
385 .attrs
= nd_numa_attributes
,
386 .is_visible
= nd_numa_attr_visible
,
388 EXPORT_SYMBOL_GPL(nd_numa_attribute_group
);
390 int nvdimm_bus_create_ndctl(struct nvdimm_bus
*nvdimm_bus
)
392 dev_t devt
= MKDEV(nvdimm_bus_major
, nvdimm_bus
->id
);
395 dev
= device_create(nd_class
, &nvdimm_bus
->dev
, devt
, nvdimm_bus
,
396 "ndctl%d", nvdimm_bus
->id
);
399 dev_dbg(&nvdimm_bus
->dev
, "failed to register ndctl%d: %ld\n",
400 nvdimm_bus
->id
, PTR_ERR(dev
));
401 return PTR_ERR_OR_ZERO(dev
);
404 void nvdimm_bus_destroy_ndctl(struct nvdimm_bus
*nvdimm_bus
)
406 device_destroy(nd_class
, MKDEV(nvdimm_bus_major
, nvdimm_bus
->id
));
409 static const struct nd_cmd_desc __nd_cmd_dimm_descs
[] = {
410 [ND_CMD_IMPLEMENTED
] = { },
413 .out_sizes
= { 4, 128, },
415 [ND_CMD_SMART_THRESHOLD
] = {
417 .out_sizes
= { 4, 8, },
419 [ND_CMD_DIMM_FLAGS
] = {
421 .out_sizes
= { 4, 4 },
423 [ND_CMD_GET_CONFIG_SIZE
] = {
425 .out_sizes
= { 4, 4, 4, },
427 [ND_CMD_GET_CONFIG_DATA
] = {
429 .in_sizes
= { 4, 4, },
431 .out_sizes
= { 4, UINT_MAX
, },
433 [ND_CMD_SET_CONFIG_DATA
] = {
435 .in_sizes
= { 4, 4, UINT_MAX
, },
441 .in_sizes
= { 4, 4, UINT_MAX
, },
443 .out_sizes
= { 4, 4, UINT_MAX
, },
447 .in_sizes
= { sizeof(struct nd_cmd_pkg
), UINT_MAX
, },
449 .out_sizes
= { UINT_MAX
, },
453 const struct nd_cmd_desc
*nd_cmd_dimm_desc(int cmd
)
455 if (cmd
< ARRAY_SIZE(__nd_cmd_dimm_descs
))
456 return &__nd_cmd_dimm_descs
[cmd
];
459 EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc
);
461 static const struct nd_cmd_desc __nd_cmd_bus_descs
[] = {
462 [ND_CMD_IMPLEMENTED
] = { },
465 .in_sizes
= { 8, 8, },
467 .out_sizes
= { 4, 4, 4, 4, },
469 [ND_CMD_ARS_START
] = {
471 .in_sizes
= { 8, 8, 2, 1, 5, },
473 .out_sizes
= { 4, 4, },
475 [ND_CMD_ARS_STATUS
] = {
477 .out_sizes
= { 4, 4, UINT_MAX
, },
479 [ND_CMD_CLEAR_ERROR
] = {
481 .in_sizes
= { 8, 8, },
483 .out_sizes
= { 4, 4, 8, },
487 .in_sizes
= { sizeof(struct nd_cmd_pkg
), UINT_MAX
, },
489 .out_sizes
= { UINT_MAX
, },
493 const struct nd_cmd_desc
*nd_cmd_bus_desc(int cmd
)
495 if (cmd
< ARRAY_SIZE(__nd_cmd_bus_descs
))
496 return &__nd_cmd_bus_descs
[cmd
];
499 EXPORT_SYMBOL_GPL(nd_cmd_bus_desc
);
501 u32
nd_cmd_in_size(struct nvdimm
*nvdimm
, int cmd
,
502 const struct nd_cmd_desc
*desc
, int idx
, void *buf
)
504 if (idx
>= desc
->in_num
)
507 if (desc
->in_sizes
[idx
] < UINT_MAX
)
508 return desc
->in_sizes
[idx
];
510 if (nvdimm
&& cmd
== ND_CMD_SET_CONFIG_DATA
&& idx
== 2) {
511 struct nd_cmd_set_config_hdr
*hdr
= buf
;
513 return hdr
->in_length
;
514 } else if (nvdimm
&& cmd
== ND_CMD_VENDOR
&& idx
== 2) {
515 struct nd_cmd_vendor_hdr
*hdr
= buf
;
517 return hdr
->in_length
;
518 } else if (cmd
== ND_CMD_CALL
) {
519 struct nd_cmd_pkg
*pkg
= buf
;
521 return pkg
->nd_size_in
;
526 EXPORT_SYMBOL_GPL(nd_cmd_in_size
);
528 u32
nd_cmd_out_size(struct nvdimm
*nvdimm
, int cmd
,
529 const struct nd_cmd_desc
*desc
, int idx
, const u32
*in_field
,
530 const u32
*out_field
)
532 if (idx
>= desc
->out_num
)
535 if (desc
->out_sizes
[idx
] < UINT_MAX
)
536 return desc
->out_sizes
[idx
];
538 if (nvdimm
&& cmd
== ND_CMD_GET_CONFIG_DATA
&& idx
== 1)
540 else if (nvdimm
&& cmd
== ND_CMD_VENDOR
&& idx
== 2)
542 else if (!nvdimm
&& cmd
== ND_CMD_ARS_STATUS
&& idx
== 2)
543 return out_field
[1] - 8;
544 else if (cmd
== ND_CMD_CALL
) {
545 struct nd_cmd_pkg
*pkg
= (struct nd_cmd_pkg
*) in_field
;
547 return pkg
->nd_size_out
;
553 EXPORT_SYMBOL_GPL(nd_cmd_out_size
);
555 void wait_nvdimm_bus_probe_idle(struct device
*dev
)
557 struct nvdimm_bus
*nvdimm_bus
= walk_to_nvdimm_bus(dev
);
560 if (nvdimm_bus
->probe_active
== 0)
562 nvdimm_bus_unlock(&nvdimm_bus
->dev
);
563 wait_event(nvdimm_bus
->probe_wait
,
564 nvdimm_bus
->probe_active
== 0);
565 nvdimm_bus_lock(&nvdimm_bus
->dev
);
569 static int pmem_active(struct device
*dev
, void *data
)
571 if (is_nd_pmem(dev
) && dev
->driver
)
576 /* set_config requires an idle interleave set */
577 static int nd_cmd_clear_to_send(struct nvdimm_bus
*nvdimm_bus
,
578 struct nvdimm
*nvdimm
, unsigned int cmd
)
580 struct nvdimm_bus_descriptor
*nd_desc
= nvdimm_bus
->nd_desc
;
582 /* ask the bus provider if it would like to block this request */
583 if (nd_desc
->clear_to_send
) {
584 int rc
= nd_desc
->clear_to_send(nd_desc
, nvdimm
, cmd
);
590 /* require clear error to go through the pmem driver */
591 if (!nvdimm
&& cmd
== ND_CMD_CLEAR_ERROR
)
592 return device_for_each_child(&nvdimm_bus
->dev
, NULL
,
595 if (!nvdimm
|| cmd
!= ND_CMD_SET_CONFIG_DATA
)
598 /* prevent label manipulation while the kernel owns label updates */
599 wait_nvdimm_bus_probe_idle(&nvdimm_bus
->dev
);
600 if (atomic_read(&nvdimm
->busy
))
605 static int __nd_ioctl(struct nvdimm_bus
*nvdimm_bus
, struct nvdimm
*nvdimm
,
606 int read_only
, unsigned int ioctl_cmd
, unsigned long arg
)
608 struct nvdimm_bus_descriptor
*nd_desc
= nvdimm_bus
->nd_desc
;
609 size_t buf_len
= 0, in_len
= 0, out_len
= 0;
610 static char out_env
[ND_CMD_MAX_ENVELOPE
];
611 static char in_env
[ND_CMD_MAX_ENVELOPE
];
612 const struct nd_cmd_desc
*desc
= NULL
;
613 unsigned int cmd
= _IOC_NR(ioctl_cmd
);
614 void __user
*p
= (void __user
*) arg
;
615 struct device
*dev
= &nvdimm_bus
->dev
;
616 struct nd_cmd_pkg pkg
;
617 const char *cmd_name
, *dimm_name
;
618 unsigned long cmd_mask
;
623 desc
= nd_cmd_dimm_desc(cmd
);
624 cmd_name
= nvdimm_cmd_name(cmd
);
625 cmd_mask
= nvdimm
->cmd_mask
;
626 dimm_name
= dev_name(&nvdimm
->dev
);
628 desc
= nd_cmd_bus_desc(cmd
);
629 cmd_name
= nvdimm_bus_cmd_name(cmd
);
630 cmd_mask
= nd_desc
->cmd_mask
;
634 if (cmd
== ND_CMD_CALL
) {
635 if (copy_from_user(&pkg
, p
, sizeof(pkg
)))
639 if (!desc
|| (desc
->out_num
+ desc
->in_num
== 0) ||
640 !test_bit(cmd
, &cmd_mask
))
643 /* fail write commands (when read-only) */
647 case ND_CMD_SET_CONFIG_DATA
:
648 case ND_CMD_ARS_START
:
649 case ND_CMD_CLEAR_ERROR
:
651 dev_dbg(&nvdimm_bus
->dev
, "'%s' command while read-only.\n",
652 nvdimm
? nvdimm_cmd_name(cmd
)
653 : nvdimm_bus_cmd_name(cmd
));
659 /* process an input envelope */
660 for (i
= 0; i
< desc
->in_num
; i
++) {
663 in_size
= nd_cmd_in_size(nvdimm
, cmd
, desc
, i
, in_env
);
664 if (in_size
== UINT_MAX
) {
665 dev_err(dev
, "%s:%s unknown input size cmd: %s field: %d\n",
666 __func__
, dimm_name
, cmd_name
, i
);
669 if (in_len
< sizeof(in_env
))
670 copy
= min_t(u32
, sizeof(in_env
) - in_len
, in_size
);
673 if (copy
&& copy_from_user(&in_env
[in_len
], p
+ in_len
, copy
))
678 if (cmd
== ND_CMD_CALL
) {
679 dev_dbg(dev
, "%s:%s, idx: %llu, in: %zu, out: %zu, len %zu\n",
680 __func__
, dimm_name
, pkg
.nd_command
,
681 in_len
, out_len
, buf_len
);
683 for (i
= 0; i
< ARRAY_SIZE(pkg
.nd_reserved2
); i
++)
684 if (pkg
.nd_reserved2
[i
])
688 /* process an output envelope */
689 for (i
= 0; i
< desc
->out_num
; i
++) {
690 u32 out_size
= nd_cmd_out_size(nvdimm
, cmd
, desc
, i
,
691 (u32
*) in_env
, (u32
*) out_env
);
694 if (out_size
== UINT_MAX
) {
695 dev_dbg(dev
, "%s:%s unknown output size cmd: %s field: %d\n",
696 __func__
, dimm_name
, cmd_name
, i
);
699 if (out_len
< sizeof(out_env
))
700 copy
= min_t(u32
, sizeof(out_env
) - out_len
, out_size
);
703 if (copy
&& copy_from_user(&out_env
[out_len
],
704 p
+ in_len
+ out_len
, copy
))
709 buf_len
= out_len
+ in_len
;
710 if (buf_len
> ND_IOCTL_MAX_BUFLEN
) {
711 dev_dbg(dev
, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__
,
712 dimm_name
, cmd_name
, buf_len
,
713 ND_IOCTL_MAX_BUFLEN
);
717 buf
= vmalloc(buf_len
);
721 if (copy_from_user(buf
, p
, buf_len
)) {
726 nvdimm_bus_lock(&nvdimm_bus
->dev
);
727 rc
= nd_cmd_clear_to_send(nvdimm_bus
, nvdimm
, cmd
);
731 rc
= nd_desc
->ndctl(nd_desc
, nvdimm
, cmd
, buf
, buf_len
, NULL
);
734 if (copy_to_user(p
, buf
, buf_len
))
737 nvdimm_bus_unlock(&nvdimm_bus
->dev
);
743 static long nd_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
745 long id
= (long) file
->private_data
;
747 struct nvdimm_bus
*nvdimm_bus
;
749 ro
= ((file
->f_flags
& O_ACCMODE
) == O_RDONLY
);
750 mutex_lock(&nvdimm_bus_list_mutex
);
751 list_for_each_entry(nvdimm_bus
, &nvdimm_bus_list
, list
) {
752 if (nvdimm_bus
->id
== id
) {
753 rc
= __nd_ioctl(nvdimm_bus
, NULL
, ro
, cmd
, arg
);
757 mutex_unlock(&nvdimm_bus_list_mutex
);
762 static int match_dimm(struct device
*dev
, void *data
)
764 long id
= (long) data
;
766 if (is_nvdimm(dev
)) {
767 struct nvdimm
*nvdimm
= to_nvdimm(dev
);
769 return nvdimm
->id
== id
;
775 static long nvdimm_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
778 struct nvdimm_bus
*nvdimm_bus
;
780 ro
= ((file
->f_flags
& O_ACCMODE
) == O_RDONLY
);
781 mutex_lock(&nvdimm_bus_list_mutex
);
782 list_for_each_entry(nvdimm_bus
, &nvdimm_bus_list
, list
) {
783 struct device
*dev
= device_find_child(&nvdimm_bus
->dev
,
784 file
->private_data
, match_dimm
);
785 struct nvdimm
*nvdimm
;
790 nvdimm
= to_nvdimm(dev
);
791 rc
= __nd_ioctl(nvdimm_bus
, nvdimm
, ro
, cmd
, arg
);
795 mutex_unlock(&nvdimm_bus_list_mutex
);
800 static int nd_open(struct inode
*inode
, struct file
*file
)
802 long minor
= iminor(inode
);
804 file
->private_data
= (void *) minor
;
808 static const struct file_operations nvdimm_bus_fops
= {
809 .owner
= THIS_MODULE
,
811 .unlocked_ioctl
= nd_ioctl
,
812 .compat_ioctl
= nd_ioctl
,
813 .llseek
= noop_llseek
,
816 static const struct file_operations nvdimm_fops
= {
817 .owner
= THIS_MODULE
,
819 .unlocked_ioctl
= nvdimm_ioctl
,
820 .compat_ioctl
= nvdimm_ioctl
,
821 .llseek
= noop_llseek
,
824 int __init
nvdimm_bus_init(void)
828 BUILD_BUG_ON(sizeof(struct nd_smart_payload
) != 128);
829 BUILD_BUG_ON(sizeof(struct nd_smart_threshold_payload
) != 8);
831 rc
= bus_register(&nvdimm_bus_type
);
835 rc
= register_chrdev(0, "ndctl", &nvdimm_bus_fops
);
838 nvdimm_bus_major
= rc
;
840 rc
= register_chrdev(0, "dimmctl", &nvdimm_fops
);
842 goto err_dimm_chrdev
;
845 nd_class
= class_create(THIS_MODULE
, "nd");
846 if (IS_ERR(nd_class
)) {
847 rc
= PTR_ERR(nd_class
);
854 unregister_chrdev(nvdimm_major
, "dimmctl");
856 unregister_chrdev(nvdimm_bus_major
, "ndctl");
858 bus_unregister(&nvdimm_bus_type
);
863 void nvdimm_bus_exit(void)
865 class_destroy(nd_class
);
866 unregister_chrdev(nvdimm_bus_major
, "ndctl");
867 unregister_chrdev(nvdimm_major
, "dimmctl");
868 bus_unregister(&nvdimm_bus_type
);