1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/*
* Copyright(c) 2013-2016 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.
*/
#include <linux/device.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include "nd-core.h"
#include "pfn.h"
#include "nd.h"
static void nd_dax_release(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
struct nd_dax *nd_dax = to_nd_dax(dev);
struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
dev_dbg(dev, "trace\n");
nd_detach_ndns(dev, &nd_pfn->ndns);
ida_simple_remove(&nd_region->dax_ida, nd_pfn->id);
kfree(nd_pfn->uuid);
kfree(nd_dax);
}
static struct device_type nd_dax_device_type = {
.name = "nd_dax",
.release = nd_dax_release,
};
bool is_nd_dax(struct device *dev)
{
return dev ? dev->type == &nd_dax_device_type : false;
}
EXPORT_SYMBOL(is_nd_dax);
struct nd_dax *to_nd_dax(struct device *dev)
{
struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev);
WARN_ON(!is_nd_dax(dev));
return nd_dax;
}
EXPORT_SYMBOL(to_nd_dax);
static const struct attribute_group *nd_dax_attribute_groups[] = {
&nd_pfn_attribute_group,
&nd_device_attribute_group,
&nd_numa_attribute_group,
NULL,
};
static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region)
{
struct nd_pfn *nd_pfn;
struct nd_dax *nd_dax;
struct device *dev;
nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL);
if (!nd_dax)
return NULL;
nd_pfn = &nd_dax->nd_pfn;
nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL);
if (nd_pfn->id < 0) {
kfree(nd_dax);
return NULL;
}
dev = &nd_pfn->dev;
dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id);
dev->groups = nd_dax_attribute_groups;
dev->type = &nd_dax_device_type;
dev->parent = &nd_region->dev;
return nd_dax;
}
struct device *nd_dax_create(struct nd_region *nd_region)
{
struct device *dev = NULL;
struct nd_dax *nd_dax;
if (!is_memory(&nd_region->dev))
return NULL;
nd_dax = nd_dax_alloc(nd_region);
if (nd_dax)
dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL);
__nd_device_register(dev);
return dev;
}
int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
{
int rc;
struct nd_dax *nd_dax;
struct device *dax_dev;
struct nd_pfn *nd_pfn;
struct nd_pfn_sb *pfn_sb;
struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
if (ndns->force_raw)
return -ENODEV;
switch (ndns->claim_class) {
case NVDIMM_CCLASS_NONE:
case NVDIMM_CCLASS_DAX:
break;
default:
return -ENODEV;
}
nvdimm_bus_lock(&ndns->dev);
nd_dax = nd_dax_alloc(nd_region);
nd_pfn = &nd_dax->nd_pfn;
dax_dev = nd_pfn_devinit(nd_pfn, ndns);
nvdimm_bus_unlock(&ndns->dev);
if (!dax_dev)
return -ENOMEM;
pfn_sb = devm_kzalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
nd_pfn->pfn_sb = pfn_sb;
rc = nd_pfn_validate(nd_pfn, DAX_SIG);
dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>");
if (rc < 0) {
nd_detach_ndns(dax_dev, &nd_pfn->ndns);
put_device(dax_dev);
} else
__nd_device_register(dax_dev);
return rc;
}
EXPORT_SYMBOL(nd_dax_probe);
|
