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1 | /* |
2 | * Copyright(c) 2013-2016 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 | #include <linux/device.h> | |
14 | #include <linux/sizes.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/mm.h> | |
17 | #include "nd-core.h" | |
18 | #include "nd.h" | |
19 | ||
20 | static void nd_dax_release(struct device *dev) | |
21 | { | |
22 | struct nd_region *nd_region = to_nd_region(dev->parent); | |
23 | struct nd_dax *nd_dax = to_nd_dax(dev); | |
24 | struct nd_pfn *nd_pfn = &nd_dax->nd_pfn; | |
25 | ||
26 | dev_dbg(dev, "%s\n", __func__); | |
27 | nd_detach_ndns(dev, &nd_pfn->ndns); | |
28 | ida_simple_remove(&nd_region->dax_ida, nd_pfn->id); | |
29 | kfree(nd_pfn->uuid); | |
30 | kfree(nd_dax); | |
31 | } | |
32 | ||
33 | static struct device_type nd_dax_device_type = { | |
34 | .name = "nd_dax", | |
35 | .release = nd_dax_release, | |
36 | }; | |
37 | ||
38 | bool is_nd_dax(struct device *dev) | |
39 | { | |
40 | return dev ? dev->type == &nd_dax_device_type : false; | |
41 | } | |
42 | EXPORT_SYMBOL(is_nd_dax); | |
43 | ||
44 | struct nd_dax *to_nd_dax(struct device *dev) | |
45 | { | |
46 | struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev); | |
47 | ||
48 | WARN_ON(!is_nd_dax(dev)); | |
49 | return nd_dax; | |
50 | } | |
51 | EXPORT_SYMBOL(to_nd_dax); | |
52 | ||
53 | static const struct attribute_group *nd_dax_attribute_groups[] = { | |
54 | &nd_pfn_attribute_group, | |
55 | &nd_device_attribute_group, | |
56 | &nd_numa_attribute_group, | |
57 | NULL, | |
58 | }; | |
59 | ||
60 | static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region) | |
61 | { | |
62 | struct nd_pfn *nd_pfn; | |
63 | struct nd_dax *nd_dax; | |
64 | struct device *dev; | |
65 | ||
66 | nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL); | |
67 | if (!nd_dax) | |
68 | return NULL; | |
69 | ||
70 | nd_pfn = &nd_dax->nd_pfn; | |
71 | nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL); | |
72 | if (nd_pfn->id < 0) { | |
73 | kfree(nd_dax); | |
74 | return NULL; | |
75 | } | |
76 | ||
77 | dev = &nd_pfn->dev; | |
78 | dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id); | |
79 | dev->groups = nd_dax_attribute_groups; | |
80 | dev->type = &nd_dax_device_type; | |
81 | dev->parent = &nd_region->dev; | |
82 | ||
83 | return nd_dax; | |
84 | } | |
85 | ||
86 | struct device *nd_dax_create(struct nd_region *nd_region) | |
87 | { | |
88 | struct device *dev = NULL; | |
89 | struct nd_dax *nd_dax; | |
90 | ||
91 | if (!is_nd_pmem(&nd_region->dev)) | |
92 | return NULL; | |
93 | ||
94 | nd_dax = nd_dax_alloc(nd_region); | |
95 | if (nd_dax) | |
96 | dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL); | |
97 | __nd_device_register(dev); | |
98 | return dev; | |
99 | } |