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e1455744 DW |
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 | #include <linux/device.h> | |
14 | #include <linux/sizes.h> | |
200c79da | 15 | #include <linux/pmem.h> |
e1455744 DW |
16 | #include "nd-core.h" |
17 | #include "pfn.h" | |
18 | #include "btt.h" | |
19 | #include "nd.h" | |
20 | ||
21 | void __nd_detach_ndns(struct device *dev, struct nd_namespace_common **_ndns) | |
22 | { | |
23 | struct nd_namespace_common *ndns = *_ndns; | |
24 | ||
25 | dev_WARN_ONCE(dev, !mutex_is_locked(&ndns->dev.mutex) | |
26 | || ndns->claim != dev, | |
27 | "%s: invalid claim\n", __func__); | |
28 | ndns->claim = NULL; | |
29 | *_ndns = NULL; | |
30 | put_device(&ndns->dev); | |
31 | } | |
32 | ||
33 | void nd_detach_ndns(struct device *dev, | |
34 | struct nd_namespace_common **_ndns) | |
35 | { | |
36 | struct nd_namespace_common *ndns = *_ndns; | |
37 | ||
38 | if (!ndns) | |
39 | return; | |
40 | get_device(&ndns->dev); | |
41 | device_lock(&ndns->dev); | |
42 | __nd_detach_ndns(dev, _ndns); | |
43 | device_unlock(&ndns->dev); | |
44 | put_device(&ndns->dev); | |
45 | } | |
46 | ||
47 | bool __nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach, | |
48 | struct nd_namespace_common **_ndns) | |
49 | { | |
50 | if (attach->claim) | |
51 | return false; | |
52 | dev_WARN_ONCE(dev, !mutex_is_locked(&attach->dev.mutex) | |
53 | || *_ndns, | |
54 | "%s: invalid claim\n", __func__); | |
55 | attach->claim = dev; | |
56 | *_ndns = attach; | |
57 | get_device(&attach->dev); | |
58 | return true; | |
59 | } | |
60 | ||
61 | bool nd_attach_ndns(struct device *dev, struct nd_namespace_common *attach, | |
62 | struct nd_namespace_common **_ndns) | |
63 | { | |
64 | bool claimed; | |
65 | ||
66 | device_lock(&attach->dev); | |
67 | claimed = __nd_attach_ndns(dev, attach, _ndns); | |
68 | device_unlock(&attach->dev); | |
69 | return claimed; | |
70 | } | |
71 | ||
72 | static int namespace_match(struct device *dev, void *data) | |
73 | { | |
74 | char *name = data; | |
75 | ||
76 | return strcmp(name, dev_name(dev)) == 0; | |
77 | } | |
78 | ||
79 | static bool is_idle(struct device *dev, struct nd_namespace_common *ndns) | |
80 | { | |
81 | struct nd_region *nd_region = to_nd_region(dev->parent); | |
82 | struct device *seed = NULL; | |
83 | ||
84 | if (is_nd_btt(dev)) | |
85 | seed = nd_region->btt_seed; | |
86 | else if (is_nd_pfn(dev)) | |
87 | seed = nd_region->pfn_seed; | |
cd03412a DW |
88 | else if (is_nd_dax(dev)) |
89 | seed = nd_region->dax_seed; | |
e1455744 DW |
90 | |
91 | if (seed == dev || ndns || dev->driver) | |
92 | return false; | |
93 | return true; | |
94 | } | |
95 | ||
96 | static void nd_detach_and_reset(struct device *dev, | |
97 | struct nd_namespace_common **_ndns) | |
98 | { | |
99 | /* detach the namespace and destroy / reset the device */ | |
100 | nd_detach_ndns(dev, _ndns); | |
101 | if (is_idle(dev, *_ndns)) { | |
102 | nd_device_unregister(dev, ND_ASYNC); | |
103 | } else if (is_nd_btt(dev)) { | |
104 | struct nd_btt *nd_btt = to_nd_btt(dev); | |
105 | ||
106 | nd_btt->lbasize = 0; | |
107 | kfree(nd_btt->uuid); | |
108 | nd_btt->uuid = NULL; | |
109 | } else if (is_nd_pfn(dev)) { | |
110 | struct nd_pfn *nd_pfn = to_nd_pfn(dev); | |
111 | ||
112 | kfree(nd_pfn->uuid); | |
113 | nd_pfn->uuid = NULL; | |
114 | nd_pfn->mode = PFN_MODE_NONE; | |
115 | } | |
116 | } | |
117 | ||
118 | ssize_t nd_namespace_store(struct device *dev, | |
119 | struct nd_namespace_common **_ndns, const char *buf, | |
120 | size_t len) | |
121 | { | |
122 | struct nd_namespace_common *ndns; | |
123 | struct device *found; | |
124 | char *name; | |
125 | ||
126 | if (dev->driver) { | |
127 | dev_dbg(dev, "%s: -EBUSY\n", __func__); | |
128 | return -EBUSY; | |
129 | } | |
130 | ||
131 | name = kstrndup(buf, len, GFP_KERNEL); | |
132 | if (!name) | |
133 | return -ENOMEM; | |
134 | strim(name); | |
135 | ||
136 | if (strncmp(name, "namespace", 9) == 0 || strcmp(name, "") == 0) | |
137 | /* pass */; | |
138 | else { | |
139 | len = -EINVAL; | |
140 | goto out; | |
141 | } | |
142 | ||
143 | ndns = *_ndns; | |
144 | if (strcmp(name, "") == 0) { | |
145 | nd_detach_and_reset(dev, _ndns); | |
146 | goto out; | |
147 | } else if (ndns) { | |
148 | dev_dbg(dev, "namespace already set to: %s\n", | |
149 | dev_name(&ndns->dev)); | |
150 | len = -EBUSY; | |
151 | goto out; | |
152 | } | |
153 | ||
154 | found = device_find_child(dev->parent, name, namespace_match); | |
155 | if (!found) { | |
156 | dev_dbg(dev, "'%s' not found under %s\n", name, | |
157 | dev_name(dev->parent)); | |
158 | len = -ENODEV; | |
159 | goto out; | |
160 | } | |
161 | ||
162 | ndns = to_ndns(found); | |
163 | if (__nvdimm_namespace_capacity(ndns) < SZ_16M) { | |
164 | dev_dbg(dev, "%s too small to host\n", name); | |
165 | len = -ENXIO; | |
166 | goto out_attach; | |
167 | } | |
168 | ||
169 | WARN_ON_ONCE(!is_nvdimm_bus_locked(dev)); | |
170 | if (!nd_attach_ndns(dev, ndns, _ndns)) { | |
171 | dev_dbg(dev, "%s already claimed\n", | |
172 | dev_name(&ndns->dev)); | |
173 | len = -EBUSY; | |
174 | } | |
175 | ||
176 | out_attach: | |
177 | put_device(&ndns->dev); /* from device_find_child */ | |
178 | out: | |
179 | kfree(name); | |
180 | return len; | |
181 | } | |
182 | ||
183 | /* | |
184 | * nd_sb_checksum: compute checksum for a generic info block | |
185 | * | |
186 | * Returns a fletcher64 checksum of everything in the given info block | |
187 | * except the last field (since that's where the checksum lives). | |
188 | */ | |
189 | u64 nd_sb_checksum(struct nd_gen_sb *nd_gen_sb) | |
190 | { | |
191 | u64 sum; | |
192 | __le64 sum_save; | |
193 | ||
194 | BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K); | |
195 | BUILD_BUG_ON(sizeof(struct nd_pfn_sb) != SZ_4K); | |
196 | BUILD_BUG_ON(sizeof(struct nd_gen_sb) != SZ_4K); | |
197 | ||
198 | sum_save = nd_gen_sb->checksum; | |
199 | nd_gen_sb->checksum = 0; | |
200 | sum = nd_fletcher64(nd_gen_sb, sizeof(*nd_gen_sb), 1); | |
201 | nd_gen_sb->checksum = sum_save; | |
202 | return sum; | |
203 | } | |
204 | EXPORT_SYMBOL(nd_sb_checksum); | |
200c79da DW |
205 | |
206 | static int nsio_rw_bytes(struct nd_namespace_common *ndns, | |
207 | resource_size_t offset, void *buf, size_t size, int rw) | |
208 | { | |
209 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); | |
210 | ||
211 | if (unlikely(offset + size > nsio->size)) { | |
212 | dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n"); | |
213 | return -EFAULT; | |
214 | } | |
215 | ||
216 | if (rw == READ) { | |
217 | unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512); | |
218 | ||
219 | if (unlikely(is_bad_pmem(&nsio->bb, offset / 512, sz_align))) | |
220 | return -EIO; | |
221 | return memcpy_from_pmem(buf, nsio->addr + offset, size); | |
222 | } else { | |
223 | memcpy_to_pmem(nsio->addr + offset, buf, size); | |
224 | wmb_pmem(); | |
225 | } | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio) | |
231 | { | |
232 | struct resource *res = &nsio->res; | |
233 | struct nd_namespace_common *ndns = &nsio->common; | |
234 | ||
235 | nsio->size = resource_size(res); | |
236 | if (!devm_request_mem_region(dev, res->start, resource_size(res), | |
237 | dev_name(dev))) { | |
238 | dev_warn(dev, "could not reserve region %pR\n", res); | |
239 | return -EBUSY; | |
240 | } | |
241 | ||
242 | ndns->rw_bytes = nsio_rw_bytes; | |
243 | if (devm_init_badblocks(dev, &nsio->bb)) | |
244 | return -ENOMEM; | |
245 | nvdimm_badblocks_populate(to_nd_region(ndns->dev.parent), &nsio->bb, | |
246 | &nsio->res); | |
247 | ||
248 | nsio->addr = devm_memremap(dev, res->start, resource_size(res), | |
249 | ARCH_MEMREMAP_PMEM); | |
250 | if (IS_ERR(nsio->addr)) | |
251 | return PTR_ERR(nsio->addr); | |
252 | return 0; | |
253 | } | |
254 | EXPORT_SYMBOL_GPL(devm_nsio_enable); | |
255 | ||
256 | void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio) | |
257 | { | |
258 | struct resource *res = &nsio->res; | |
259 | ||
260 | devm_memunmap(dev, nsio->addr); | |
261 | devm_exit_badblocks(dev, &nsio->bb); | |
262 | devm_release_mem_region(dev, res->start, resource_size(res)); | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(devm_nsio_disable); |