1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
4 */
5 #include <linux/device.h>
6 #include <linux/sizes.h>
7 #include <linux/slab.h>
8 #include <linux/mm.h>
9 #include "nd-core.h"
10 #include "pfn.h"
11 #include "nd.h"
12
nd_dax_release(struct device * dev)13 static void nd_dax_release(struct device *dev)
14 {
15 struct nd_region *nd_region = to_nd_region(dev->parent);
16 struct nd_dax *nd_dax = to_nd_dax(dev);
17 struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
18
19 dev_dbg(dev, "trace\n");
20 nd_detach_ndns(dev, &nd_pfn->ndns);
21 ida_simple_remove(&nd_region->dax_ida, nd_pfn->id);
22 kfree(nd_pfn->uuid);
23 kfree(nd_dax);
24 }
25
26 static struct device_type nd_dax_device_type = {
27 .name = "nd_dax",
28 .release = nd_dax_release,
29 };
30
is_nd_dax(struct device * dev)31 bool is_nd_dax(struct device *dev)
32 {
33 return dev ? dev->type == &nd_dax_device_type : false;
34 }
35 EXPORT_SYMBOL(is_nd_dax);
36
to_nd_dax(struct device * dev)37 struct nd_dax *to_nd_dax(struct device *dev)
38 {
39 struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev);
40
41 WARN_ON(!is_nd_dax(dev));
42 return nd_dax;
43 }
44 EXPORT_SYMBOL(to_nd_dax);
45
46 static const struct attribute_group *nd_dax_attribute_groups[] = {
47 &nd_pfn_attribute_group,
48 &nd_device_attribute_group,
49 &nd_numa_attribute_group,
50 NULL,
51 };
52
nd_dax_alloc(struct nd_region * nd_region)53 static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region)
54 {
55 struct nd_pfn *nd_pfn;
56 struct nd_dax *nd_dax;
57 struct device *dev;
58
59 nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL);
60 if (!nd_dax)
61 return NULL;
62
63 nd_pfn = &nd_dax->nd_pfn;
64 nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL);
65 if (nd_pfn->id < 0) {
66 kfree(nd_dax);
67 return NULL;
68 }
69
70 dev = &nd_pfn->dev;
71 dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id);
72 dev->groups = nd_dax_attribute_groups;
73 dev->type = &nd_dax_device_type;
74 dev->parent = &nd_region->dev;
75
76 return nd_dax;
77 }
78
nd_dax_create(struct nd_region * nd_region)79 struct device *nd_dax_create(struct nd_region *nd_region)
80 {
81 struct device *dev = NULL;
82 struct nd_dax *nd_dax;
83
84 if (!is_memory(&nd_region->dev))
85 return NULL;
86
87 nd_dax = nd_dax_alloc(nd_region);
88 if (nd_dax)
89 dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL);
90 __nd_device_register(dev);
91 return dev;
92 }
93
nd_dax_probe(struct device * dev,struct nd_namespace_common * ndns)94 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
95 {
96 int rc;
97 struct nd_dax *nd_dax;
98 struct device *dax_dev;
99 struct nd_pfn *nd_pfn;
100 struct nd_pfn_sb *pfn_sb;
101 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
102
103 if (ndns->force_raw)
104 return -ENODEV;
105
106 switch (ndns->claim_class) {
107 case NVDIMM_CCLASS_NONE:
108 case NVDIMM_CCLASS_DAX:
109 break;
110 default:
111 return -ENODEV;
112 }
113
114 nvdimm_bus_lock(&ndns->dev);
115 nd_dax = nd_dax_alloc(nd_region);
116 nd_pfn = &nd_dax->nd_pfn;
117 dax_dev = nd_pfn_devinit(nd_pfn, ndns);
118 nvdimm_bus_unlock(&ndns->dev);
119 if (!dax_dev)
120 return -ENOMEM;
121 pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
122 nd_pfn->pfn_sb = pfn_sb;
123 rc = nd_pfn_validate(nd_pfn, DAX_SIG);
124 dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>");
125 if (rc < 0) {
126 nd_detach_ndns(dax_dev, &nd_pfn->ndns);
127 put_device(dax_dev);
128 } else
129 __nd_device_register(dax_dev);
130
131 return rc;
132 }
133 EXPORT_SYMBOL(nd_dax_probe);
134