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5b497af4 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e1455744 | 2 | /* |
cd03412a | 3 | * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. |
e1455744 | 4 | */ |
ac515c08 | 5 | #include <linux/memremap.h> |
e1455744 DW |
6 | #include <linux/blkdev.h> |
7 | #include <linux/device.h> | |
8 | #include <linux/genhd.h> | |
9 | #include <linux/sizes.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/mm.h> | |
13 | #include "nd-core.h" | |
14 | #include "pfn.h" | |
15 | #include "nd.h" | |
16 | ||
17 | static void nd_pfn_release(struct device *dev) | |
18 | { | |
19 | struct nd_region *nd_region = to_nd_region(dev->parent); | |
20 | struct nd_pfn *nd_pfn = to_nd_pfn(dev); | |
21 | ||
426824d6 | 22 | dev_dbg(dev, "trace\n"); |
e1455744 DW |
23 | nd_detach_ndns(&nd_pfn->dev, &nd_pfn->ndns); |
24 | ida_simple_remove(&nd_region->pfn_ida, nd_pfn->id); | |
25 | kfree(nd_pfn->uuid); | |
26 | kfree(nd_pfn); | |
27 | } | |
28 | ||
e1455744 DW |
29 | struct nd_pfn *to_nd_pfn(struct device *dev) |
30 | { | |
31 | struct nd_pfn *nd_pfn = container_of(dev, struct nd_pfn, dev); | |
32 | ||
33 | WARN_ON(!is_nd_pfn(dev)); | |
34 | return nd_pfn; | |
35 | } | |
36 | EXPORT_SYMBOL(to_nd_pfn); | |
37 | ||
38 | static ssize_t mode_show(struct device *dev, | |
39 | struct device_attribute *attr, char *buf) | |
40 | { | |
cd03412a | 41 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
e1455744 DW |
42 | |
43 | switch (nd_pfn->mode) { | |
44 | case PFN_MODE_RAM: | |
45 | return sprintf(buf, "ram\n"); | |
46 | case PFN_MODE_PMEM: | |
47 | return sprintf(buf, "pmem\n"); | |
48 | default: | |
49 | return sprintf(buf, "none\n"); | |
50 | } | |
51 | } | |
52 | ||
53 | static ssize_t mode_store(struct device *dev, | |
54 | struct device_attribute *attr, const char *buf, size_t len) | |
55 | { | |
cd03412a | 56 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
e1455744 DW |
57 | ssize_t rc = 0; |
58 | ||
87a30e1f | 59 | nd_device_lock(dev); |
e1455744 DW |
60 | nvdimm_bus_lock(dev); |
61 | if (dev->driver) | |
62 | rc = -EBUSY; | |
63 | else { | |
64 | size_t n = len - 1; | |
65 | ||
66 | if (strncmp(buf, "pmem\n", n) == 0 | |
67 | || strncmp(buf, "pmem", n) == 0) { | |
d2c0f041 | 68 | nd_pfn->mode = PFN_MODE_PMEM; |
e1455744 DW |
69 | } else if (strncmp(buf, "ram\n", n) == 0 |
70 | || strncmp(buf, "ram", n) == 0) | |
71 | nd_pfn->mode = PFN_MODE_RAM; | |
72 | else if (strncmp(buf, "none\n", n) == 0 | |
73 | || strncmp(buf, "none", n) == 0) | |
74 | nd_pfn->mode = PFN_MODE_NONE; | |
75 | else | |
76 | rc = -EINVAL; | |
77 | } | |
426824d6 DW |
78 | dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, |
79 | buf[len - 1] == '\n' ? "" : "\n"); | |
e1455744 | 80 | nvdimm_bus_unlock(dev); |
87a30e1f | 81 | nd_device_unlock(dev); |
e1455744 DW |
82 | |
83 | return rc ? rc : len; | |
84 | } | |
85 | static DEVICE_ATTR_RW(mode); | |
86 | ||
315c5625 DW |
87 | static ssize_t align_show(struct device *dev, |
88 | struct device_attribute *attr, char *buf) | |
89 | { | |
cd03412a | 90 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
315c5625 | 91 | |
af7d9f0c | 92 | return sprintf(buf, "%ld\n", nd_pfn->align); |
315c5625 DW |
93 | } |
94 | ||
f5376699 | 95 | static unsigned long *nd_pfn_supported_alignments(unsigned long *alignments) |
1fdadbeb | 96 | { |
1fdadbeb | 97 | |
f5376699 AK |
98 | alignments[0] = PAGE_SIZE; |
99 | ||
100 | if (has_transparent_hugepage()) { | |
101 | alignments[1] = HPAGE_PMD_SIZE; | |
102 | if (IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)) | |
103 | alignments[2] = HPAGE_PUD_SIZE; | |
104 | } | |
105 | ||
106 | return alignments; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Use pmd mapping if supported as default alignment | |
111 | */ | |
112 | static unsigned long nd_pfn_default_alignment(void) | |
113 | { | |
1fdadbeb | 114 | |
f5376699 AK |
115 | if (has_transparent_hugepage()) |
116 | return HPAGE_PMD_SIZE; | |
117 | return PAGE_SIZE; | |
1fdadbeb OH |
118 | } |
119 | ||
315c5625 DW |
120 | static ssize_t align_store(struct device *dev, |
121 | struct device_attribute *attr, const char *buf, size_t len) | |
122 | { | |
cd03412a | 123 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
f5376699 | 124 | unsigned long aligns[MAX_NVDIMM_ALIGN] = { [0] = 0, }; |
315c5625 DW |
125 | ssize_t rc; |
126 | ||
87a30e1f | 127 | nd_device_lock(dev); |
315c5625 | 128 | nvdimm_bus_lock(dev); |
f13d2b61 | 129 | rc = nd_size_select_store(dev, buf, &nd_pfn->align, |
f5376699 | 130 | nd_pfn_supported_alignments(aligns)); |
426824d6 DW |
131 | dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, |
132 | buf[len - 1] == '\n' ? "" : "\n"); | |
315c5625 | 133 | nvdimm_bus_unlock(dev); |
87a30e1f | 134 | nd_device_unlock(dev); |
315c5625 DW |
135 | |
136 | return rc ? rc : len; | |
137 | } | |
138 | static DEVICE_ATTR_RW(align); | |
139 | ||
e1455744 DW |
140 | static ssize_t uuid_show(struct device *dev, |
141 | struct device_attribute *attr, char *buf) | |
142 | { | |
cd03412a | 143 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
e1455744 DW |
144 | |
145 | if (nd_pfn->uuid) | |
146 | return sprintf(buf, "%pUb\n", nd_pfn->uuid); | |
147 | return sprintf(buf, "\n"); | |
148 | } | |
149 | ||
150 | static ssize_t uuid_store(struct device *dev, | |
151 | struct device_attribute *attr, const char *buf, size_t len) | |
152 | { | |
cd03412a | 153 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
e1455744 DW |
154 | ssize_t rc; |
155 | ||
87a30e1f | 156 | nd_device_lock(dev); |
e1455744 | 157 | rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len); |
426824d6 DW |
158 | dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, |
159 | buf[len - 1] == '\n' ? "" : "\n"); | |
87a30e1f | 160 | nd_device_unlock(dev); |
e1455744 DW |
161 | |
162 | return rc ? rc : len; | |
163 | } | |
164 | static DEVICE_ATTR_RW(uuid); | |
165 | ||
166 | static ssize_t namespace_show(struct device *dev, | |
167 | struct device_attribute *attr, char *buf) | |
168 | { | |
cd03412a | 169 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
e1455744 DW |
170 | ssize_t rc; |
171 | ||
172 | nvdimm_bus_lock(dev); | |
173 | rc = sprintf(buf, "%s\n", nd_pfn->ndns | |
174 | ? dev_name(&nd_pfn->ndns->dev) : ""); | |
175 | nvdimm_bus_unlock(dev); | |
176 | return rc; | |
177 | } | |
178 | ||
179 | static ssize_t namespace_store(struct device *dev, | |
180 | struct device_attribute *attr, const char *buf, size_t len) | |
181 | { | |
cd03412a | 182 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
e1455744 DW |
183 | ssize_t rc; |
184 | ||
87a30e1f | 185 | nd_device_lock(dev); |
4ca8b57a | 186 | nvdimm_bus_lock(dev); |
e1455744 | 187 | rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len); |
426824d6 DW |
188 | dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, |
189 | buf[len - 1] == '\n' ? "" : "\n"); | |
e1455744 | 190 | nvdimm_bus_unlock(dev); |
87a30e1f | 191 | nd_device_unlock(dev); |
e1455744 DW |
192 | |
193 | return rc; | |
194 | } | |
195 | static DEVICE_ATTR_RW(namespace); | |
196 | ||
f6ed58c7 DW |
197 | static ssize_t resource_show(struct device *dev, |
198 | struct device_attribute *attr, char *buf) | |
199 | { | |
cd03412a | 200 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
f6ed58c7 DW |
201 | ssize_t rc; |
202 | ||
87a30e1f | 203 | nd_device_lock(dev); |
f6ed58c7 DW |
204 | if (dev->driver) { |
205 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; | |
206 | u64 offset = __le64_to_cpu(pfn_sb->dataoff); | |
207 | struct nd_namespace_common *ndns = nd_pfn->ndns; | |
208 | u32 start_pad = __le32_to_cpu(pfn_sb->start_pad); | |
209 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); | |
210 | ||
211 | rc = sprintf(buf, "%#llx\n", (unsigned long long) nsio->res.start | |
212 | + start_pad + offset); | |
213 | } else { | |
214 | /* no address to convey if the pfn instance is disabled */ | |
215 | rc = -ENXIO; | |
216 | } | |
87a30e1f | 217 | nd_device_unlock(dev); |
f6ed58c7 DW |
218 | |
219 | return rc; | |
220 | } | |
bfd2e914 | 221 | static DEVICE_ATTR(resource, 0400, resource_show, NULL); |
f6ed58c7 DW |
222 | |
223 | static ssize_t size_show(struct device *dev, | |
224 | struct device_attribute *attr, char *buf) | |
225 | { | |
cd03412a | 226 | struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); |
f6ed58c7 DW |
227 | ssize_t rc; |
228 | ||
87a30e1f | 229 | nd_device_lock(dev); |
f6ed58c7 DW |
230 | if (dev->driver) { |
231 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; | |
232 | u64 offset = __le64_to_cpu(pfn_sb->dataoff); | |
233 | struct nd_namespace_common *ndns = nd_pfn->ndns; | |
234 | u32 start_pad = __le32_to_cpu(pfn_sb->start_pad); | |
235 | u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc); | |
236 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); | |
237 | ||
238 | rc = sprintf(buf, "%llu\n", (unsigned long long) | |
239 | resource_size(&nsio->res) - start_pad | |
240 | - end_trunc - offset); | |
241 | } else { | |
242 | /* no size to convey if the pfn instance is disabled */ | |
243 | rc = -ENXIO; | |
244 | } | |
87a30e1f | 245 | nd_device_unlock(dev); |
f6ed58c7 DW |
246 | |
247 | return rc; | |
248 | } | |
249 | static DEVICE_ATTR_RO(size); | |
250 | ||
1fdadbeb OH |
251 | static ssize_t supported_alignments_show(struct device *dev, |
252 | struct device_attribute *attr, char *buf) | |
253 | { | |
f5376699 AK |
254 | unsigned long aligns[MAX_NVDIMM_ALIGN] = { [0] = 0, }; |
255 | ||
256 | return nd_size_select_show(0, | |
257 | nd_pfn_supported_alignments(aligns), buf); | |
1fdadbeb OH |
258 | } |
259 | static DEVICE_ATTR_RO(supported_alignments); | |
260 | ||
e1455744 DW |
261 | static struct attribute *nd_pfn_attributes[] = { |
262 | &dev_attr_mode.attr, | |
263 | &dev_attr_namespace.attr, | |
264 | &dev_attr_uuid.attr, | |
315c5625 | 265 | &dev_attr_align.attr, |
f6ed58c7 DW |
266 | &dev_attr_resource.attr, |
267 | &dev_attr_size.attr, | |
1fdadbeb | 268 | &dev_attr_supported_alignments.attr, |
e1455744 DW |
269 | NULL, |
270 | }; | |
271 | ||
78c81cc8 | 272 | static struct attribute_group nd_pfn_attribute_group = { |
e1455744 DW |
273 | .attrs = nd_pfn_attributes, |
274 | }; | |
275 | ||
78c81cc8 | 276 | const struct attribute_group *nd_pfn_attribute_groups[] = { |
e1455744 DW |
277 | &nd_pfn_attribute_group, |
278 | &nd_device_attribute_group, | |
279 | &nd_numa_attribute_group, | |
280 | NULL, | |
281 | }; | |
282 | ||
78c81cc8 DW |
283 | static const struct device_type nd_pfn_device_type = { |
284 | .name = "nd_pfn", | |
285 | .release = nd_pfn_release, | |
286 | .groups = nd_pfn_attribute_groups, | |
287 | }; | |
288 | ||
289 | bool is_nd_pfn(struct device *dev) | |
290 | { | |
291 | return dev ? dev->type == &nd_pfn_device_type : false; | |
292 | } | |
293 | EXPORT_SYMBOL(is_nd_pfn); | |
294 | ||
cd03412a | 295 | struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn, |
e1455744 DW |
296 | struct nd_namespace_common *ndns) |
297 | { | |
0cbfeef2 | 298 | struct device *dev; |
e1455744 | 299 | |
cd03412a | 300 | if (!nd_pfn) |
e1455744 DW |
301 | return NULL; |
302 | ||
cd03412a | 303 | nd_pfn->mode = PFN_MODE_NONE; |
f5376699 | 304 | nd_pfn->align = nd_pfn_default_alignment(); |
cd03412a DW |
305 | dev = &nd_pfn->dev; |
306 | device_initialize(&nd_pfn->dev); | |
307 | if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) { | |
426824d6 DW |
308 | dev_dbg(&ndns->dev, "failed, already claimed by %s\n", |
309 | dev_name(ndns->claim)); | |
cd03412a | 310 | put_device(dev); |
e1455744 | 311 | return NULL; |
cd03412a DW |
312 | } |
313 | return dev; | |
314 | } | |
315 | ||
316 | static struct nd_pfn *nd_pfn_alloc(struct nd_region *nd_region) | |
317 | { | |
318 | struct nd_pfn *nd_pfn; | |
319 | struct device *dev; | |
e1455744 DW |
320 | |
321 | nd_pfn = kzalloc(sizeof(*nd_pfn), GFP_KERNEL); | |
322 | if (!nd_pfn) | |
323 | return NULL; | |
324 | ||
325 | nd_pfn->id = ida_simple_get(&nd_region->pfn_ida, 0, 0, GFP_KERNEL); | |
326 | if (nd_pfn->id < 0) { | |
327 | kfree(nd_pfn); | |
328 | return NULL; | |
329 | } | |
330 | ||
e1455744 DW |
331 | dev = &nd_pfn->dev; |
332 | dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id); | |
cd03412a DW |
333 | dev->type = &nd_pfn_device_type; |
334 | dev->parent = &nd_region->dev; | |
335 | ||
336 | return nd_pfn; | |
e1455744 DW |
337 | } |
338 | ||
339 | struct device *nd_pfn_create(struct nd_region *nd_region) | |
340 | { | |
cd03412a DW |
341 | struct nd_pfn *nd_pfn; |
342 | struct device *dev; | |
343 | ||
c9e582aa | 344 | if (!is_memory(&nd_region->dev)) |
cd03412a | 345 | return NULL; |
e1455744 | 346 | |
cd03412a DW |
347 | nd_pfn = nd_pfn_alloc(nd_region); |
348 | dev = nd_pfn_devinit(nd_pfn, NULL); | |
e1455744 | 349 | |
cd03412a | 350 | __nd_device_register(dev); |
e1455744 DW |
351 | return dev; |
352 | } | |
353 | ||
48af2f7e VV |
354 | /* |
355 | * nd_pfn_clear_memmap_errors() clears any errors in the volatile memmap | |
356 | * space associated with the namespace. If the memmap is set to DRAM, then | |
357 | * this is a no-op. Since the memmap area is freshly initialized during | |
358 | * probe, we have an opportunity to clear any badblocks in this area. | |
359 | */ | |
360 | static int nd_pfn_clear_memmap_errors(struct nd_pfn *nd_pfn) | |
361 | { | |
362 | struct nd_region *nd_region = to_nd_region(nd_pfn->dev.parent); | |
363 | struct nd_namespace_common *ndns = nd_pfn->ndns; | |
364 | void *zero_page = page_address(ZERO_PAGE(0)); | |
365 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; | |
366 | int num_bad, meta_num, rc, bb_present; | |
367 | sector_t first_bad, meta_start; | |
368 | struct nd_namespace_io *nsio; | |
369 | ||
370 | if (nd_pfn->mode != PFN_MODE_PMEM) | |
371 | return 0; | |
372 | ||
373 | nsio = to_nd_namespace_io(&ndns->dev); | |
374 | meta_start = (SZ_4K + sizeof(*pfn_sb)) >> 9; | |
375 | meta_num = (le64_to_cpu(pfn_sb->dataoff) >> 9) - meta_start; | |
376 | ||
8f4b01fc AK |
377 | /* |
378 | * re-enable the namespace with correct size so that we can access | |
379 | * the device memmap area. | |
380 | */ | |
381 | devm_namespace_disable(&nd_pfn->dev, ndns); | |
382 | rc = devm_namespace_enable(&nd_pfn->dev, ndns, le64_to_cpu(pfn_sb->dataoff)); | |
383 | if (rc) | |
384 | return rc; | |
385 | ||
48af2f7e VV |
386 | do { |
387 | unsigned long zero_len; | |
388 | u64 nsoff; | |
389 | ||
390 | bb_present = badblocks_check(&nd_region->bb, meta_start, | |
391 | meta_num, &first_bad, &num_bad); | |
392 | if (bb_present) { | |
72deb455 | 393 | dev_dbg(&nd_pfn->dev, "meta: %x badblocks at %llx\n", |
48af2f7e VV |
394 | num_bad, first_bad); |
395 | nsoff = ALIGN_DOWN((nd_region->ndr_start | |
396 | + (first_bad << 9)) - nsio->res.start, | |
397 | PAGE_SIZE); | |
398 | zero_len = ALIGN(num_bad << 9, PAGE_SIZE); | |
399 | while (zero_len) { | |
400 | unsigned long chunk = min(zero_len, PAGE_SIZE); | |
401 | ||
402 | rc = nvdimm_write_bytes(ndns, nsoff, zero_page, | |
403 | chunk, 0); | |
404 | if (rc) | |
405 | break; | |
406 | ||
407 | zero_len -= chunk; | |
408 | nsoff += chunk; | |
409 | } | |
410 | if (rc) { | |
411 | dev_err(&nd_pfn->dev, | |
72deb455 | 412 | "error clearing %x badblocks at %llx\n", |
48af2f7e VV |
413 | num_bad, first_bad); |
414 | return rc; | |
415 | } | |
416 | } | |
417 | } while (bb_present); | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
f5376699 AK |
422 | static bool nd_supported_alignment(unsigned long align) |
423 | { | |
424 | int i; | |
425 | unsigned long supported[MAX_NVDIMM_ALIGN] = { [0] = 0, }; | |
426 | ||
427 | if (align == 0) | |
428 | return false; | |
429 | ||
430 | nd_pfn_supported_alignments(supported); | |
431 | for (i = 0; supported[i]; i++) | |
432 | if (align == supported[i]) | |
433 | return true; | |
434 | return false; | |
435 | } | |
436 | ||
7e3e888d DW |
437 | /** |
438 | * nd_pfn_validate - read and validate info-block | |
439 | * @nd_pfn: fsdax namespace runtime state / properties | |
440 | * @sig: 'devdax' or 'fsdax' signature | |
441 | * | |
442 | * Upon return the info-block buffer contents (->pfn_sb) are | |
443 | * indeterminate when validation fails, and a coherent info-block | |
444 | * otherwise. | |
445 | */ | |
c5ed9268 | 446 | int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig) |
e1455744 | 447 | { |
e1455744 | 448 | u64 checksum, offset; |
1ee6667c | 449 | enum nd_pfn_mode mode; |
a34d5e8a | 450 | struct nd_namespace_io *nsio; |
19deaa21 | 451 | unsigned long align, start_pad; |
a34d5e8a DW |
452 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; |
453 | struct nd_namespace_common *ndns = nd_pfn->ndns; | |
454 | const u8 *parent_uuid = nd_dev_to_uuid(&ndns->dev); | |
e1455744 DW |
455 | |
456 | if (!pfn_sb || !ndns) | |
457 | return -ENODEV; | |
458 | ||
c9e582aa | 459 | if (!is_memory(nd_pfn->dev.parent)) |
e1455744 DW |
460 | return -ENODEV; |
461 | ||
3ae3d67b | 462 | if (nvdimm_read_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0)) |
e1455744 DW |
463 | return -ENXIO; |
464 | ||
c5ed9268 | 465 | if (memcmp(pfn_sb->signature, sig, PFN_SIG_LEN) != 0) |
e1455744 DW |
466 | return -ENODEV; |
467 | ||
468 | checksum = le64_to_cpu(pfn_sb->checksum); | |
469 | pfn_sb->checksum = 0; | |
470 | if (checksum != nd_sb_checksum((struct nd_gen_sb *) pfn_sb)) | |
471 | return -ENODEV; | |
472 | pfn_sb->checksum = cpu_to_le64(checksum); | |
473 | ||
a34d5e8a DW |
474 | if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0) |
475 | return -ENODEV; | |
476 | ||
cfe30b87 DW |
477 | if (__le16_to_cpu(pfn_sb->version_minor) < 1) { |
478 | pfn_sb->start_pad = 0; | |
479 | pfn_sb->end_trunc = 0; | |
480 | } | |
481 | ||
45a0dac0 DW |
482 | if (__le16_to_cpu(pfn_sb->version_minor) < 2) |
483 | pfn_sb->align = 0; | |
484 | ||
edbb52c2 AK |
485 | if (__le16_to_cpu(pfn_sb->version_minor) < 4) { |
486 | pfn_sb->page_struct_size = cpu_to_le16(64); | |
487 | pfn_sb->page_size = cpu_to_le32(PAGE_SIZE); | |
488 | } | |
489 | ||
e1455744 DW |
490 | switch (le32_to_cpu(pfn_sb->mode)) { |
491 | case PFN_MODE_RAM: | |
e1455744 | 492 | case PFN_MODE_PMEM: |
45eb570a | 493 | break; |
e1455744 DW |
494 | default: |
495 | return -ENXIO; | |
496 | } | |
497 | ||
1ee6667c DW |
498 | align = le32_to_cpu(pfn_sb->align); |
499 | offset = le64_to_cpu(pfn_sb->dataoff); | |
19deaa21 | 500 | start_pad = le32_to_cpu(pfn_sb->start_pad); |
1ee6667c DW |
501 | if (align == 0) |
502 | align = 1UL << ilog2(offset); | |
503 | mode = le32_to_cpu(pfn_sb->mode); | |
504 | ||
edbb52c2 AK |
505 | if ((le32_to_cpu(pfn_sb->page_size) > PAGE_SIZE) && |
506 | (mode == PFN_MODE_PMEM)) { | |
507 | dev_err(&nd_pfn->dev, | |
508 | "init failed, page size mismatch %d\n", | |
509 | le32_to_cpu(pfn_sb->page_size)); | |
510 | return -EOPNOTSUPP; | |
511 | } | |
512 | ||
513 | if ((le16_to_cpu(pfn_sb->page_struct_size) < sizeof(struct page)) && | |
514 | (mode == PFN_MODE_PMEM)) { | |
515 | dev_err(&nd_pfn->dev, | |
516 | "init failed, struct page size mismatch %d\n", | |
517 | le16_to_cpu(pfn_sb->page_struct_size)); | |
518 | return -EOPNOTSUPP; | |
519 | } | |
520 | ||
f5376699 AK |
521 | /* |
522 | * Check whether the we support the alignment. For Dax if the | |
523 | * superblock alignment is not matching, we won't initialize | |
524 | * the device. | |
525 | */ | |
526 | if (!nd_supported_alignment(align) && | |
527 | !memcmp(pfn_sb->signature, DAX_SIG, PFN_SIG_LEN)) { | |
528 | dev_err(&nd_pfn->dev, "init failed, alignment mismatch: " | |
529 | "%ld:%ld\n", nd_pfn->align, align); | |
530 | return -EOPNOTSUPP; | |
531 | } | |
532 | ||
e1455744 | 533 | if (!nd_pfn->uuid) { |
1ee6667c DW |
534 | /* |
535 | * When probing a namepace via nd_pfn_probe() the uuid | |
536 | * is NULL (see: nd_pfn_devinit()) we init settings from | |
537 | * pfn_sb | |
538 | */ | |
e1455744 DW |
539 | nd_pfn->uuid = kmemdup(pfn_sb->uuid, 16, GFP_KERNEL); |
540 | if (!nd_pfn->uuid) | |
541 | return -ENOMEM; | |
1ee6667c DW |
542 | nd_pfn->align = align; |
543 | nd_pfn->mode = mode; | |
e1455744 | 544 | } else { |
1ee6667c DW |
545 | /* |
546 | * When probing a pfn / dax instance we validate the | |
547 | * live settings against the pfn_sb | |
548 | */ | |
e1455744 | 549 | if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0) |
e5670563 | 550 | return -ENODEV; |
1ee6667c DW |
551 | |
552 | /* | |
553 | * If the uuid validates, but other settings mismatch | |
554 | * return EINVAL because userspace has managed to change | |
555 | * the configuration without specifying new | |
556 | * identification. | |
557 | */ | |
558 | if (nd_pfn->align != align || nd_pfn->mode != mode) { | |
559 | dev_err(&nd_pfn->dev, | |
560 | "init failed, settings mismatch\n"); | |
561 | dev_dbg(&nd_pfn->dev, "align: %lx:%lx mode: %d:%d\n", | |
562 | nd_pfn->align, align, nd_pfn->mode, | |
563 | mode); | |
564 | return -EINVAL; | |
565 | } | |
e1455744 DW |
566 | } |
567 | ||
1ee6667c | 568 | if (align > nvdimm_namespace_capacity(ndns)) { |
315c5625 | 569 | dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n", |
1ee6667c | 570 | align, nvdimm_namespace_capacity(ndns)); |
315c5625 DW |
571 | return -EINVAL; |
572 | } | |
573 | ||
e1455744 DW |
574 | /* |
575 | * These warnings are verbose because they can only trigger in | |
576 | * the case where the physical address alignment of the | |
577 | * namespace has changed since the pfn superblock was | |
578 | * established. | |
579 | */ | |
e1455744 | 580 | nsio = to_nd_namespace_io(&ndns->dev); |
9f1e8cee | 581 | if (offset >= resource_size(&nsio->res)) { |
e1455744 DW |
582 | dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n", |
583 | dev_name(&ndns->dev)); | |
584 | return -EBUSY; | |
585 | } | |
586 | ||
19deaa21 | 587 | if ((align && !IS_ALIGNED(nsio->res.start + offset + start_pad, align)) |
5e24c9fd | 588 | || !IS_ALIGNED(offset, PAGE_SIZE)) { |
1ee6667c DW |
589 | dev_err(&nd_pfn->dev, |
590 | "bad offset: %#llx dax disabled align: %#lx\n", | |
591 | offset, align); | |
315c5625 DW |
592 | return -ENXIO; |
593 | } | |
594 | ||
c1f45d86 | 595 | return 0; |
e1455744 | 596 | } |
32ab0a3f | 597 | EXPORT_SYMBOL(nd_pfn_validate); |
e1455744 | 598 | |
200c79da | 599 | int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns) |
e1455744 DW |
600 | { |
601 | int rc; | |
e1455744 | 602 | struct nd_pfn *nd_pfn; |
bd032943 | 603 | struct device *pfn_dev; |
e1455744 DW |
604 | struct nd_pfn_sb *pfn_sb; |
605 | struct nd_region *nd_region = to_nd_region(ndns->dev.parent); | |
606 | ||
607 | if (ndns->force_raw) | |
608 | return -ENODEV; | |
609 | ||
b3fde74e DW |
610 | switch (ndns->claim_class) { |
611 | case NVDIMM_CCLASS_NONE: | |
612 | case NVDIMM_CCLASS_PFN: | |
613 | break; | |
614 | default: | |
615 | return -ENODEV; | |
616 | } | |
617 | ||
e1455744 | 618 | nvdimm_bus_lock(&ndns->dev); |
cd03412a DW |
619 | nd_pfn = nd_pfn_alloc(nd_region); |
620 | pfn_dev = nd_pfn_devinit(nd_pfn, ndns); | |
e1455744 | 621 | nvdimm_bus_unlock(&ndns->dev); |
bd032943 | 622 | if (!pfn_dev) |
e1455744 | 623 | return -ENOMEM; |
7e3e888d | 624 | pfn_sb = devm_kmalloc(dev, sizeof(*pfn_sb), GFP_KERNEL); |
bd032943 | 625 | nd_pfn = to_nd_pfn(pfn_dev); |
e1455744 | 626 | nd_pfn->pfn_sb = pfn_sb; |
c5ed9268 | 627 | rc = nd_pfn_validate(nd_pfn, PFN_SIG); |
426824d6 | 628 | dev_dbg(dev, "pfn: %s\n", rc == 0 ? dev_name(pfn_dev) : "<none>"); |
e1455744 | 629 | if (rc < 0) { |
452bae0a | 630 | nd_detach_ndns(pfn_dev, &nd_pfn->ndns); |
bd032943 | 631 | put_device(pfn_dev); |
e1455744 | 632 | } else |
bd032943 | 633 | __nd_device_register(pfn_dev); |
e1455744 DW |
634 | |
635 | return rc; | |
636 | } | |
637 | EXPORT_SYMBOL(nd_pfn_probe); | |
ac515c08 DW |
638 | |
639 | /* | |
a3619190 DW |
640 | * We hotplug memory at sub-section granularity, pad the reserved area |
641 | * from the previous section base to the namespace base address. | |
ac515c08 DW |
642 | */ |
643 | static unsigned long init_altmap_base(resource_size_t base) | |
644 | { | |
645 | unsigned long base_pfn = PHYS_PFN(base); | |
646 | ||
a3619190 | 647 | return SUBSECTION_ALIGN_DOWN(base_pfn); |
ac515c08 DW |
648 | } |
649 | ||
650 | static unsigned long init_altmap_reserve(resource_size_t base) | |
651 | { | |
8f4b01fc | 652 | unsigned long reserve = nd_info_block_reserve() >> PAGE_SHIFT; |
ac515c08 DW |
653 | unsigned long base_pfn = PHYS_PFN(base); |
654 | ||
a3619190 | 655 | reserve += base_pfn - SUBSECTION_ALIGN_DOWN(base_pfn); |
ac515c08 DW |
656 | return reserve; |
657 | } | |
658 | ||
e8d51348 | 659 | static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap) |
ac515c08 | 660 | { |
e8d51348 CH |
661 | struct resource *res = &pgmap->res; |
662 | struct vmem_altmap *altmap = &pgmap->altmap; | |
ac515c08 DW |
663 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; |
664 | u64 offset = le64_to_cpu(pfn_sb->dataoff); | |
665 | u32 start_pad = __le32_to_cpu(pfn_sb->start_pad); | |
666 | u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc); | |
8f4b01fc | 667 | u32 reserve = nd_info_block_reserve(); |
ac515c08 DW |
668 | struct nd_namespace_common *ndns = nd_pfn->ndns; |
669 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); | |
670 | resource_size_t base = nsio->res.start + start_pad; | |
cf387d96 | 671 | resource_size_t end = nsio->res.end - end_trunc; |
ac515c08 DW |
672 | struct vmem_altmap __altmap = { |
673 | .base_pfn = init_altmap_base(base), | |
674 | .reserve = init_altmap_reserve(base), | |
cf387d96 | 675 | .end_pfn = PHYS_PFN(end), |
ac515c08 DW |
676 | }; |
677 | ||
678 | memcpy(res, &nsio->res, sizeof(*res)); | |
679 | res->start += start_pad; | |
680 | res->end -= end_trunc; | |
681 | ||
ac515c08 | 682 | if (nd_pfn->mode == PFN_MODE_RAM) { |
11a35810 | 683 | if (offset < reserve) |
e8d51348 | 684 | return -EINVAL; |
ac515c08 | 685 | nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns); |
ac515c08 | 686 | } else if (nd_pfn->mode == PFN_MODE_PMEM) { |
a3619190 | 687 | nd_pfn->npfns = PHYS_PFN((resource_size(res) - offset)); |
ac515c08 DW |
688 | if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns) |
689 | dev_info(&nd_pfn->dev, | |
690 | "number of pfns truncated from %lld to %ld\n", | |
691 | le64_to_cpu(nd_pfn->pfn_sb->npfns), | |
692 | nd_pfn->npfns); | |
693 | memcpy(altmap, &__altmap, sizeof(*altmap)); | |
11a35810 | 694 | altmap->free = PHYS_PFN(offset - reserve); |
ac515c08 | 695 | altmap->alloc = 0; |
514caf23 | 696 | pgmap->flags |= PGMAP_ALTMAP_VALID; |
ac515c08 | 697 | } else |
e8d51348 | 698 | return -ENXIO; |
ac515c08 | 699 | |
e8d51348 | 700 | return 0; |
ac515c08 DW |
701 | } |
702 | ||
703 | static int nd_pfn_init(struct nd_pfn *nd_pfn) | |
704 | { | |
705 | struct nd_namespace_common *ndns = nd_pfn->ndns; | |
ae86cbfe | 706 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); |
ac515c08 | 707 | resource_size_t start, size; |
ac515c08 | 708 | struct nd_region *nd_region; |
a3619190 | 709 | unsigned long npfns, align; |
274b9240 | 710 | u32 end_trunc; |
ac515c08 | 711 | struct nd_pfn_sb *pfn_sb; |
ac515c08 | 712 | phys_addr_t offset; |
c5ed9268 | 713 | const char *sig; |
ac515c08 DW |
714 | u64 checksum; |
715 | int rc; | |
716 | ||
7e3e888d | 717 | pfn_sb = devm_kmalloc(&nd_pfn->dev, sizeof(*pfn_sb), GFP_KERNEL); |
ac515c08 DW |
718 | if (!pfn_sb) |
719 | return -ENOMEM; | |
720 | ||
721 | nd_pfn->pfn_sb = pfn_sb; | |
c5ed9268 DW |
722 | if (is_nd_dax(&nd_pfn->dev)) |
723 | sig = DAX_SIG; | |
724 | else | |
725 | sig = PFN_SIG; | |
7e3e888d | 726 | |
c5ed9268 | 727 | rc = nd_pfn_validate(nd_pfn, sig); |
c1f45d86 AK |
728 | if (rc == 0) |
729 | return nd_pfn_clear_memmap_errors(nd_pfn); | |
ac515c08 DW |
730 | if (rc != -ENODEV) |
731 | return rc; | |
732 | ||
733 | /* no info block, do init */; | |
7e3e888d DW |
734 | memset(pfn_sb, 0, sizeof(*pfn_sb)); |
735 | ||
ac515c08 DW |
736 | nd_region = to_nd_region(nd_pfn->dev.parent); |
737 | if (nd_region->ro) { | |
738 | dev_info(&nd_pfn->dev, | |
739 | "%s is read-only, unable to init metadata\n", | |
740 | dev_name(&nd_region->dev)); | |
741 | return -ENXIO; | |
742 | } | |
743 | ||
ac515c08 DW |
744 | /* |
745 | * Note, we use 64 here for the standard size of struct page, | |
746 | * debugging options may cause it to be larger in which case the | |
747 | * implementation will limit the pfns advertised through | |
748 | * ->direct_access() to those that are included in the memmap. | |
749 | */ | |
a3619190 | 750 | start = nsio->res.start; |
ac515c08 | 751 | size = resource_size(&nsio->res); |
a3619190 DW |
752 | npfns = PHYS_PFN(size - SZ_8K); |
753 | align = max(nd_pfn->align, (1UL << SUBSECTION_SHIFT)); | |
274b9240 | 754 | end_trunc = start + size - ALIGN_DOWN(start + size, align); |
594d6d96 | 755 | if (nd_pfn->mode == PFN_MODE_PMEM) { |
594d6d96 | 756 | /* |
0dd69643 OH |
757 | * The altmap should be padded out to the block size used |
758 | * when populating the vmemmap. This *should* be equal to | |
759 | * PMD_SIZE for most architectures. | |
e96f0bf2 AK |
760 | * |
761 | * Also make sure size of struct page is less than 64. We | |
762 | * want to make sure we use large enough size here so that | |
763 | * we don't have a dynamic reserve space depending on | |
764 | * struct page size. But we also want to make sure we notice | |
765 | * when we end up adding new elements to struct page. | |
594d6d96 | 766 | */ |
e96f0bf2 AK |
767 | BUILD_BUG_ON(sizeof(struct page) > MAX_STRUCT_PAGE_SIZE); |
768 | offset = ALIGN(start + SZ_8K + MAX_STRUCT_PAGE_SIZE * npfns, align) | |
769 | - start; | |
594d6d96 | 770 | } else if (nd_pfn->mode == PFN_MODE_RAM) |
a3619190 | 771 | offset = ALIGN(start + SZ_8K, align) - start; |
ac515c08 DW |
772 | else |
773 | return -ENXIO; | |
774 | ||
a3619190 | 775 | if (offset >= size) { |
ac515c08 DW |
776 | dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n", |
777 | dev_name(&ndns->dev)); | |
778 | return -ENXIO; | |
779 | } | |
780 | ||
274b9240 | 781 | npfns = PHYS_PFN(size - offset - end_trunc); |
ac515c08 DW |
782 | pfn_sb->mode = cpu_to_le32(nd_pfn->mode); |
783 | pfn_sb->dataoff = cpu_to_le64(offset); | |
784 | pfn_sb->npfns = cpu_to_le64(npfns); | |
c5ed9268 | 785 | memcpy(pfn_sb->signature, sig, PFN_SIG_LEN); |
ac515c08 DW |
786 | memcpy(pfn_sb->uuid, nd_pfn->uuid, 16); |
787 | memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16); | |
788 | pfn_sb->version_major = cpu_to_le16(1); | |
edbb52c2 | 789 | pfn_sb->version_minor = cpu_to_le16(4); |
274b9240 | 790 | pfn_sb->end_trunc = cpu_to_le32(end_trunc); |
45a0dac0 | 791 | pfn_sb->align = cpu_to_le32(nd_pfn->align); |
edbb52c2 AK |
792 | pfn_sb->page_struct_size = cpu_to_le16(MAX_STRUCT_PAGE_SIZE); |
793 | pfn_sb->page_size = cpu_to_le32(PAGE_SIZE); | |
ac515c08 DW |
794 | checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb); |
795 | pfn_sb->checksum = cpu_to_le64(checksum); | |
796 | ||
c1f45d86 AK |
797 | rc = nd_pfn_clear_memmap_errors(nd_pfn); |
798 | if (rc) | |
799 | return rc; | |
800 | ||
3ae3d67b | 801 | return nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0); |
ac515c08 DW |
802 | } |
803 | ||
804 | /* | |
805 | * Determine the effective resource range and vmem_altmap from an nd_pfn | |
806 | * instance. | |
807 | */ | |
e8d51348 | 808 | int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap) |
ac515c08 DW |
809 | { |
810 | int rc; | |
811 | ||
812 | if (!nd_pfn->uuid || !nd_pfn->ndns) | |
e8d51348 | 813 | return -ENODEV; |
ac515c08 DW |
814 | |
815 | rc = nd_pfn_init(nd_pfn); | |
816 | if (rc) | |
e8d51348 | 817 | return rc; |
ac515c08 | 818 | |
e8d51348 CH |
819 | /* we need a valid pfn_sb before we can init a dev_pagemap */ |
820 | return __nvdimm_setup_pfn(nd_pfn, pgmap); | |
ac515c08 DW |
821 | } |
822 | EXPORT_SYMBOL_GPL(nvdimm_setup_pfn); |