blob: ae81a2f1da50b1e9f9cf5a14bd180df19b3ccab1 [file] [log] [blame]
Dan Williamse1455742015-07-30 17:57:47 -04001/*
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/blkdev.h>
14#include <linux/device.h>
15#include <linux/genhd.h>
16#include <linux/sizes.h>
17#include <linux/slab.h>
18#include <linux/fs.h>
19#include <linux/mm.h>
20#include "nd-core.h"
21#include "pfn.h"
22#include "nd.h"
23
24static void nd_pfn_release(struct device *dev)
25{
26 struct nd_region *nd_region = to_nd_region(dev->parent);
27 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
28
29 dev_dbg(dev, "%s\n", __func__);
30 nd_detach_ndns(&nd_pfn->dev, &nd_pfn->ndns);
31 ida_simple_remove(&nd_region->pfn_ida, nd_pfn->id);
32 kfree(nd_pfn->uuid);
33 kfree(nd_pfn);
34}
35
36static struct device_type nd_pfn_device_type = {
37 .name = "nd_pfn",
38 .release = nd_pfn_release,
39};
40
41bool is_nd_pfn(struct device *dev)
42{
43 return dev ? dev->type == &nd_pfn_device_type : false;
44}
45EXPORT_SYMBOL(is_nd_pfn);
46
47struct nd_pfn *to_nd_pfn(struct device *dev)
48{
49 struct nd_pfn *nd_pfn = container_of(dev, struct nd_pfn, dev);
50
51 WARN_ON(!is_nd_pfn(dev));
52 return nd_pfn;
53}
54EXPORT_SYMBOL(to_nd_pfn);
55
56static ssize_t mode_show(struct device *dev,
57 struct device_attribute *attr, char *buf)
58{
59 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
60
61 switch (nd_pfn->mode) {
62 case PFN_MODE_RAM:
63 return sprintf(buf, "ram\n");
64 case PFN_MODE_PMEM:
65 return sprintf(buf, "pmem\n");
66 default:
67 return sprintf(buf, "none\n");
68 }
69}
70
71static ssize_t mode_store(struct device *dev,
72 struct device_attribute *attr, const char *buf, size_t len)
73{
74 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
75 ssize_t rc = 0;
76
77 device_lock(dev);
78 nvdimm_bus_lock(dev);
79 if (dev->driver)
80 rc = -EBUSY;
81 else {
82 size_t n = len - 1;
83
84 if (strncmp(buf, "pmem\n", n) == 0
85 || strncmp(buf, "pmem", n) == 0) {
Dan Williamsd2c0f042016-01-15 16:56:26 -080086 nd_pfn->mode = PFN_MODE_PMEM;
Dan Williamse1455742015-07-30 17:57:47 -040087 } else if (strncmp(buf, "ram\n", n) == 0
88 || strncmp(buf, "ram", n) == 0)
89 nd_pfn->mode = PFN_MODE_RAM;
90 else if (strncmp(buf, "none\n", n) == 0
91 || strncmp(buf, "none", n) == 0)
92 nd_pfn->mode = PFN_MODE_NONE;
93 else
94 rc = -EINVAL;
95 }
96 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
97 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
98 nvdimm_bus_unlock(dev);
99 device_unlock(dev);
100
101 return rc ? rc : len;
102}
103static DEVICE_ATTR_RW(mode);
104
Dan Williams315c5622015-12-10 14:45:23 -0800105static ssize_t align_show(struct device *dev,
106 struct device_attribute *attr, char *buf)
107{
108 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
109
110 return sprintf(buf, "%lx\n", nd_pfn->align);
111}
112
113static ssize_t __align_store(struct nd_pfn *nd_pfn, const char *buf)
114{
115 unsigned long val;
116 int rc;
117
118 rc = kstrtoul(buf, 0, &val);
119 if (rc)
120 return rc;
121
122 if (!is_power_of_2(val) || val < PAGE_SIZE || val > SZ_1G)
123 return -EINVAL;
124
125 if (nd_pfn->dev.driver)
126 return -EBUSY;
127 else
128 nd_pfn->align = val;
129
130 return 0;
131}
132
133static ssize_t align_store(struct device *dev,
134 struct device_attribute *attr, const char *buf, size_t len)
135{
136 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
137 ssize_t rc;
138
139 device_lock(dev);
140 nvdimm_bus_lock(dev);
141 rc = __align_store(nd_pfn, buf);
142 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
143 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
144 nvdimm_bus_unlock(dev);
145 device_unlock(dev);
146
147 return rc ? rc : len;
148}
149static DEVICE_ATTR_RW(align);
150
Dan Williamse1455742015-07-30 17:57:47 -0400151static ssize_t uuid_show(struct device *dev,
152 struct device_attribute *attr, char *buf)
153{
154 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
155
156 if (nd_pfn->uuid)
157 return sprintf(buf, "%pUb\n", nd_pfn->uuid);
158 return sprintf(buf, "\n");
159}
160
161static ssize_t uuid_store(struct device *dev,
162 struct device_attribute *attr, const char *buf, size_t len)
163{
164 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
165 ssize_t rc;
166
167 device_lock(dev);
168 rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len);
169 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
170 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
171 device_unlock(dev);
172
173 return rc ? rc : len;
174}
175static DEVICE_ATTR_RW(uuid);
176
177static ssize_t namespace_show(struct device *dev,
178 struct device_attribute *attr, char *buf)
179{
180 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
181 ssize_t rc;
182
183 nvdimm_bus_lock(dev);
184 rc = sprintf(buf, "%s\n", nd_pfn->ndns
185 ? dev_name(&nd_pfn->ndns->dev) : "");
186 nvdimm_bus_unlock(dev);
187 return rc;
188}
189
190static ssize_t namespace_store(struct device *dev,
191 struct device_attribute *attr, const char *buf, size_t len)
192{
193 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
194 ssize_t rc;
195
Dan Williamse1455742015-07-30 17:57:47 -0400196 device_lock(dev);
Axel Lin4ca8b57a2015-09-16 21:25:38 +0800197 nvdimm_bus_lock(dev);
Dan Williamse1455742015-07-30 17:57:47 -0400198 rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len);
199 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
200 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
Dan Williamse1455742015-07-30 17:57:47 -0400201 nvdimm_bus_unlock(dev);
Axel Lin4ca8b57a2015-09-16 21:25:38 +0800202 device_unlock(dev);
Dan Williamse1455742015-07-30 17:57:47 -0400203
204 return rc;
205}
206static DEVICE_ATTR_RW(namespace);
207
208static struct attribute *nd_pfn_attributes[] = {
209 &dev_attr_mode.attr,
210 &dev_attr_namespace.attr,
211 &dev_attr_uuid.attr,
Dan Williams315c5622015-12-10 14:45:23 -0800212 &dev_attr_align.attr,
Dan Williamse1455742015-07-30 17:57:47 -0400213 NULL,
214};
215
216static struct attribute_group nd_pfn_attribute_group = {
217 .attrs = nd_pfn_attributes,
218};
219
220static const struct attribute_group *nd_pfn_attribute_groups[] = {
221 &nd_pfn_attribute_group,
222 &nd_device_attribute_group,
223 &nd_numa_attribute_group,
224 NULL,
225};
226
227static struct device *__nd_pfn_create(struct nd_region *nd_region,
Dan Williamse1455742015-07-30 17:57:47 -0400228 struct nd_namespace_common *ndns)
229{
230 struct nd_pfn *nd_pfn;
231 struct device *dev;
232
233 /* we can only create pages for contiguous ranged of pmem */
234 if (!is_nd_pmem(&nd_region->dev))
235 return NULL;
236
237 nd_pfn = kzalloc(sizeof(*nd_pfn), GFP_KERNEL);
238 if (!nd_pfn)
239 return NULL;
240
241 nd_pfn->id = ida_simple_get(&nd_region->pfn_ida, 0, 0, GFP_KERNEL);
242 if (nd_pfn->id < 0) {
243 kfree(nd_pfn);
244 return NULL;
245 }
246
Dan Williamsf7c6ab82015-12-10 16:11:59 -0800247 nd_pfn->mode = PFN_MODE_NONE;
Dan Williams315c5622015-12-10 14:45:23 -0800248 nd_pfn->align = HPAGE_SIZE;
Dan Williamse1455742015-07-30 17:57:47 -0400249 dev = &nd_pfn->dev;
250 dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id);
251 dev->parent = &nd_region->dev;
252 dev->type = &nd_pfn_device_type;
253 dev->groups = nd_pfn_attribute_groups;
254 device_initialize(&nd_pfn->dev);
255 if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) {
256 dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
257 __func__, dev_name(ndns->claim));
258 put_device(dev);
259 return NULL;
260 }
261 return dev;
262}
263
264struct device *nd_pfn_create(struct nd_region *nd_region)
265{
Dan Williamsf7c6ab82015-12-10 16:11:59 -0800266 struct device *dev = __nd_pfn_create(nd_region, NULL);
Dan Williamse1455742015-07-30 17:57:47 -0400267
268 if (dev)
269 __nd_device_register(dev);
270 return dev;
271}
272
Dan Williams32ab0a3f2015-08-01 02:16:37 -0400273int nd_pfn_validate(struct nd_pfn *nd_pfn)
Dan Williamse1455742015-07-30 17:57:47 -0400274{
Dan Williamse1455742015-07-30 17:57:47 -0400275 u64 checksum, offset;
Dan Williamsa34d5e82015-12-12 16:09:14 -0800276 struct nd_namespace_io *nsio;
277 struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
278 struct nd_namespace_common *ndns = nd_pfn->ndns;
279 const u8 *parent_uuid = nd_dev_to_uuid(&ndns->dev);
Dan Williamse1455742015-07-30 17:57:47 -0400280
281 if (!pfn_sb || !ndns)
282 return -ENODEV;
283
284 if (!is_nd_pmem(nd_pfn->dev.parent))
285 return -ENODEV;
286
Dan Williamse1455742015-07-30 17:57:47 -0400287 if (nvdimm_read_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb)))
288 return -ENXIO;
289
290 if (memcmp(pfn_sb->signature, PFN_SIG, PFN_SIG_LEN) != 0)
291 return -ENODEV;
292
293 checksum = le64_to_cpu(pfn_sb->checksum);
294 pfn_sb->checksum = 0;
295 if (checksum != nd_sb_checksum((struct nd_gen_sb *) pfn_sb))
296 return -ENODEV;
297 pfn_sb->checksum = cpu_to_le64(checksum);
298
Dan Williamsa34d5e82015-12-12 16:09:14 -0800299 if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0)
300 return -ENODEV;
301
Dan Williamse1455742015-07-30 17:57:47 -0400302 switch (le32_to_cpu(pfn_sb->mode)) {
303 case PFN_MODE_RAM:
Dan Williamse1455742015-07-30 17:57:47 -0400304 case PFN_MODE_PMEM:
Dan Williams45eb5702016-01-29 17:42:51 -0800305 break;
Dan Williamse1455742015-07-30 17:57:47 -0400306 default:
307 return -ENXIO;
308 }
309
310 if (!nd_pfn->uuid) {
311 /* from probe we allocate */
312 nd_pfn->uuid = kmemdup(pfn_sb->uuid, 16, GFP_KERNEL);
313 if (!nd_pfn->uuid)
314 return -ENOMEM;
315 } else {
316 /* from init we validate */
317 if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0)
318 return -EINVAL;
319 }
320
Dan Williams315c5622015-12-10 14:45:23 -0800321 if (nd_pfn->align > nvdimm_namespace_capacity(ndns)) {
322 dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n",
323 nd_pfn->align, nvdimm_namespace_capacity(ndns));
324 return -EINVAL;
325 }
326
Dan Williamse1455742015-07-30 17:57:47 -0400327 /*
328 * These warnings are verbose because they can only trigger in
329 * the case where the physical address alignment of the
330 * namespace has changed since the pfn superblock was
331 * established.
332 */
333 offset = le64_to_cpu(pfn_sb->dataoff);
334 nsio = to_nd_namespace_io(&ndns->dev);
Dan Williams9f1e8ce2015-12-10 15:14:20 -0800335 if (offset >= resource_size(&nsio->res)) {
Dan Williamse1455742015-07-30 17:57:47 -0400336 dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
337 dev_name(&ndns->dev));
338 return -EBUSY;
339 }
340
Dan Williams315c5622015-12-10 14:45:23 -0800341 nd_pfn->align = 1UL << ilog2(offset);
342 if (!is_power_of_2(offset) || offset < PAGE_SIZE) {
343 dev_err(&nd_pfn->dev, "bad offset: %#llx dax disabled\n",
344 offset);
345 return -ENXIO;
346 }
347
Dan Williamse1455742015-07-30 17:57:47 -0400348 return 0;
349}
Dan Williams32ab0a3f2015-08-01 02:16:37 -0400350EXPORT_SYMBOL(nd_pfn_validate);
Dan Williamse1455742015-07-30 17:57:47 -0400351
352int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata)
353{
354 int rc;
355 struct device *dev;
356 struct nd_pfn *nd_pfn;
357 struct nd_pfn_sb *pfn_sb;
358 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
359
360 if (ndns->force_raw)
361 return -ENODEV;
362
363 nvdimm_bus_lock(&ndns->dev);
Dan Williamsf7c6ab82015-12-10 16:11:59 -0800364 dev = __nd_pfn_create(nd_region, ndns);
Dan Williamse1455742015-07-30 17:57:47 -0400365 nvdimm_bus_unlock(&ndns->dev);
366 if (!dev)
367 return -ENOMEM;
368 dev_set_drvdata(dev, drvdata);
369 pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL);
370 nd_pfn = to_nd_pfn(dev);
371 nd_pfn->pfn_sb = pfn_sb;
372 rc = nd_pfn_validate(nd_pfn);
373 nd_pfn->pfn_sb = NULL;
374 kfree(pfn_sb);
375 dev_dbg(&ndns->dev, "%s: pfn: %s\n", __func__,
376 rc == 0 ? dev_name(dev) : "<none>");
377 if (rc < 0) {
378 __nd_detach_ndns(dev, &nd_pfn->ndns);
379 put_device(dev);
380 } else
381 __nd_device_register(&nd_pfn->dev);
382
383 return rc;
384}
385EXPORT_SYMBOL(nd_pfn_probe);