]>
Commit | Line | Data |
---|---|---|
e6dfb2de 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 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
4d88a97a | 14 | #include <linux/vmalloc.h> |
e6dfb2de | 15 | #include <linux/device.h> |
62232e45 | 16 | #include <linux/ndctl.h> |
e6dfb2de DW |
17 | #include <linux/slab.h> |
18 | #include <linux/io.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/mm.h> | |
21 | #include "nd-core.h" | |
0ba1c634 | 22 | #include "label.h" |
4d88a97a | 23 | #include "nd.h" |
e6dfb2de DW |
24 | |
25 | static DEFINE_IDA(dimm_ida); | |
26 | ||
4d88a97a DW |
27 | /* |
28 | * Retrieve bus and dimm handle and return if this bus supports | |
29 | * get_config_data commands | |
30 | */ | |
aee65987 | 31 | int nvdimm_check_config_data(struct device *dev) |
4d88a97a | 32 | { |
aee65987 | 33 | struct nvdimm *nvdimm = to_nvdimm(dev); |
4d88a97a | 34 | |
aee65987 TK |
35 | if (!nvdimm->cmd_mask || |
36 | !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) { | |
37 | if (nvdimm->flags & NDD_ALIASING) | |
38 | return -ENXIO; | |
39 | else | |
40 | return -ENOTTY; | |
41 | } | |
4d88a97a DW |
42 | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static int validate_dimm(struct nvdimm_drvdata *ndd) | |
47 | { | |
aee65987 | 48 | int rc; |
4d88a97a | 49 | |
aee65987 TK |
50 | if (!ndd) |
51 | return -EINVAL; | |
52 | ||
53 | rc = nvdimm_check_config_data(ndd->dev); | |
54 | if (rc) | |
4d88a97a DW |
55 | dev_dbg(ndd->dev, "%pf: %s error: %d\n", |
56 | __builtin_return_address(0), __func__, rc); | |
57 | return rc; | |
58 | } | |
59 | ||
60 | /** | |
61 | * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area | |
62 | * @nvdimm: dimm to initialize | |
63 | */ | |
64 | int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd) | |
65 | { | |
66 | struct nd_cmd_get_config_size *cmd = &ndd->nsarea; | |
67 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); | |
68 | struct nvdimm_bus_descriptor *nd_desc; | |
69 | int rc = validate_dimm(ndd); | |
70 | ||
71 | if (rc) | |
72 | return rc; | |
73 | ||
74 | if (cmd->config_size) | |
75 | return 0; /* already valid */ | |
76 | ||
77 | memset(cmd, 0, sizeof(*cmd)); | |
78 | nd_desc = nvdimm_bus->nd_desc; | |
79 | return nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), | |
aef25338 | 80 | ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), NULL); |
4d88a97a DW |
81 | } |
82 | ||
83 | int nvdimm_init_config_data(struct nvdimm_drvdata *ndd) | |
84 | { | |
85 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); | |
86 | struct nd_cmd_get_config_data_hdr *cmd; | |
87 | struct nvdimm_bus_descriptor *nd_desc; | |
88 | int rc = validate_dimm(ndd); | |
89 | u32 max_cmd_size, config_size; | |
90 | size_t offset; | |
91 | ||
92 | if (rc) | |
93 | return rc; | |
94 | ||
95 | if (ndd->data) | |
96 | return 0; | |
97 | ||
4a826c83 DW |
98 | if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0 |
99 | || ndd->nsarea.config_size < ND_LABEL_MIN_SIZE) { | |
100 | dev_dbg(ndd->dev, "failed to init config data area: (%d:%d)\n", | |
101 | ndd->nsarea.max_xfer, ndd->nsarea.config_size); | |
4d88a97a | 102 | return -ENXIO; |
4a826c83 | 103 | } |
4d88a97a DW |
104 | |
105 | ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL); | |
106 | if (!ndd->data) | |
107 | ndd->data = vmalloc(ndd->nsarea.config_size); | |
108 | ||
109 | if (!ndd->data) | |
110 | return -ENOMEM; | |
111 | ||
112 | max_cmd_size = min_t(u32, PAGE_SIZE, ndd->nsarea.max_xfer); | |
113 | cmd = kzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL); | |
114 | if (!cmd) | |
115 | return -ENOMEM; | |
116 | ||
117 | nd_desc = nvdimm_bus->nd_desc; | |
118 | for (config_size = ndd->nsarea.config_size, offset = 0; | |
119 | config_size; config_size -= cmd->in_length, | |
120 | offset += cmd->in_length) { | |
121 | cmd->in_length = min(config_size, max_cmd_size); | |
122 | cmd->in_offset = offset; | |
123 | rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), | |
124 | ND_CMD_GET_CONFIG_DATA, cmd, | |
aef25338 | 125 | cmd->in_length + sizeof(*cmd), NULL); |
4d88a97a DW |
126 | if (rc || cmd->status) { |
127 | rc = -ENXIO; | |
128 | break; | |
129 | } | |
130 | memcpy(ndd->data + offset, cmd->out_buf, cmd->in_length); | |
131 | } | |
132 | dev_dbg(ndd->dev, "%s: len: %zu rc: %d\n", __func__, offset, rc); | |
133 | kfree(cmd); | |
134 | ||
135 | return rc; | |
136 | } | |
137 | ||
f524bf27 DW |
138 | int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, |
139 | void *buf, size_t len) | |
140 | { | |
141 | int rc = validate_dimm(ndd); | |
142 | size_t max_cmd_size, buf_offset; | |
143 | struct nd_cmd_set_config_hdr *cmd; | |
144 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); | |
145 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
146 | ||
147 | if (rc) | |
148 | return rc; | |
149 | ||
150 | if (!ndd->data) | |
151 | return -ENXIO; | |
152 | ||
153 | if (offset + len > ndd->nsarea.config_size) | |
154 | return -ENXIO; | |
155 | ||
156 | max_cmd_size = min_t(u32, PAGE_SIZE, len); | |
157 | max_cmd_size = min_t(u32, max_cmd_size, ndd->nsarea.max_xfer); | |
158 | cmd = kzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL); | |
159 | if (!cmd) | |
160 | return -ENOMEM; | |
161 | ||
162 | for (buf_offset = 0; len; len -= cmd->in_length, | |
163 | buf_offset += cmd->in_length) { | |
164 | size_t cmd_size; | |
165 | u32 *status; | |
166 | ||
167 | cmd->in_offset = offset + buf_offset; | |
168 | cmd->in_length = min(max_cmd_size, len); | |
169 | memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length); | |
170 | ||
171 | /* status is output in the last 4-bytes of the command buffer */ | |
172 | cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32); | |
173 | status = ((void *) cmd) + cmd_size - sizeof(u32); | |
174 | ||
175 | rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), | |
aef25338 | 176 | ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, NULL); |
f524bf27 DW |
177 | if (rc || *status) { |
178 | rc = rc ? rc : -ENXIO; | |
179 | break; | |
180 | } | |
181 | } | |
182 | kfree(cmd); | |
183 | ||
184 | return rc; | |
185 | } | |
186 | ||
e6dfb2de DW |
187 | static void nvdimm_release(struct device *dev) |
188 | { | |
189 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
190 | ||
191 | ida_simple_remove(&dimm_ida, nvdimm->id); | |
192 | kfree(nvdimm); | |
193 | } | |
194 | ||
195 | static struct device_type nvdimm_device_type = { | |
196 | .name = "nvdimm", | |
197 | .release = nvdimm_release, | |
198 | }; | |
199 | ||
62232e45 | 200 | bool is_nvdimm(struct device *dev) |
e6dfb2de DW |
201 | { |
202 | return dev->type == &nvdimm_device_type; | |
203 | } | |
204 | ||
205 | struct nvdimm *to_nvdimm(struct device *dev) | |
206 | { | |
207 | struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev); | |
208 | ||
209 | WARN_ON(!is_nvdimm(dev)); | |
210 | return nvdimm; | |
211 | } | |
212 | EXPORT_SYMBOL_GPL(to_nvdimm); | |
213 | ||
047fc8a1 RZ |
214 | struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr) |
215 | { | |
216 | struct nd_region *nd_region = &ndbr->nd_region; | |
217 | struct nd_mapping *nd_mapping = &nd_region->mapping[0]; | |
218 | ||
219 | return nd_mapping->nvdimm; | |
220 | } | |
221 | EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm); | |
222 | ||
bf9bccc1 DW |
223 | struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping) |
224 | { | |
225 | struct nvdimm *nvdimm = nd_mapping->nvdimm; | |
226 | ||
227 | WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev)); | |
228 | ||
229 | return dev_get_drvdata(&nvdimm->dev); | |
230 | } | |
231 | EXPORT_SYMBOL(to_ndd); | |
232 | ||
233 | void nvdimm_drvdata_release(struct kref *kref) | |
234 | { | |
235 | struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref); | |
236 | struct device *dev = ndd->dev; | |
237 | struct resource *res, *_r; | |
238 | ||
239 | dev_dbg(dev, "%s\n", __func__); | |
240 | ||
241 | nvdimm_bus_lock(dev); | |
242 | for_each_dpa_resource_safe(ndd, res, _r) | |
243 | nvdimm_free_dpa(ndd, res); | |
244 | nvdimm_bus_unlock(dev); | |
245 | ||
a06a7576 | 246 | kvfree(ndd->data); |
bf9bccc1 DW |
247 | kfree(ndd); |
248 | put_device(dev); | |
249 | } | |
250 | ||
251 | void get_ndd(struct nvdimm_drvdata *ndd) | |
252 | { | |
253 | kref_get(&ndd->kref); | |
254 | } | |
255 | ||
256 | void put_ndd(struct nvdimm_drvdata *ndd) | |
257 | { | |
258 | if (ndd) | |
259 | kref_put(&ndd->kref, nvdimm_drvdata_release); | |
260 | } | |
261 | ||
e6dfb2de DW |
262 | const char *nvdimm_name(struct nvdimm *nvdimm) |
263 | { | |
264 | return dev_name(&nvdimm->dev); | |
265 | } | |
266 | EXPORT_SYMBOL_GPL(nvdimm_name); | |
267 | ||
ba9c8dd3 DW |
268 | struct kobject *nvdimm_kobj(struct nvdimm *nvdimm) |
269 | { | |
270 | return &nvdimm->dev.kobj; | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(nvdimm_kobj); | |
273 | ||
e3654eca DW |
274 | unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm) |
275 | { | |
276 | return nvdimm->cmd_mask; | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(nvdimm_cmd_mask); | |
279 | ||
e6dfb2de DW |
280 | void *nvdimm_provider_data(struct nvdimm *nvdimm) |
281 | { | |
62232e45 DW |
282 | if (nvdimm) |
283 | return nvdimm->provider_data; | |
284 | return NULL; | |
e6dfb2de DW |
285 | } |
286 | EXPORT_SYMBOL_GPL(nvdimm_provider_data); | |
287 | ||
62232e45 DW |
288 | static ssize_t commands_show(struct device *dev, |
289 | struct device_attribute *attr, char *buf) | |
290 | { | |
291 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
292 | int cmd, len = 0; | |
293 | ||
e3654eca | 294 | if (!nvdimm->cmd_mask) |
62232e45 DW |
295 | return sprintf(buf, "\n"); |
296 | ||
e3654eca | 297 | for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG) |
62232e45 DW |
298 | len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd)); |
299 | len += sprintf(buf + len, "\n"); | |
300 | return len; | |
301 | } | |
302 | static DEVICE_ATTR_RO(commands); | |
303 | ||
eaf96153 DW |
304 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
305 | char *buf) | |
306 | { | |
307 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
308 | ||
309 | /* | |
310 | * The state may be in the process of changing, userspace should | |
311 | * quiesce probing if it wants a static answer | |
312 | */ | |
313 | nvdimm_bus_lock(dev); | |
314 | nvdimm_bus_unlock(dev); | |
315 | return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy) | |
316 | ? "active" : "idle"); | |
317 | } | |
318 | static DEVICE_ATTR_RO(state); | |
319 | ||
0ba1c634 DW |
320 | static ssize_t available_slots_show(struct device *dev, |
321 | struct device_attribute *attr, char *buf) | |
322 | { | |
323 | struct nvdimm_drvdata *ndd = dev_get_drvdata(dev); | |
324 | ssize_t rc; | |
325 | u32 nfree; | |
326 | ||
327 | if (!ndd) | |
328 | return -ENXIO; | |
329 | ||
330 | nvdimm_bus_lock(dev); | |
331 | nfree = nd_label_nfree(ndd); | |
332 | if (nfree - 1 > nfree) { | |
333 | dev_WARN_ONCE(dev, 1, "we ate our last label?\n"); | |
334 | nfree = 0; | |
335 | } else | |
336 | nfree--; | |
337 | rc = sprintf(buf, "%d\n", nfree); | |
338 | nvdimm_bus_unlock(dev); | |
339 | return rc; | |
340 | } | |
341 | static DEVICE_ATTR_RO(available_slots); | |
342 | ||
62232e45 | 343 | static struct attribute *nvdimm_attributes[] = { |
eaf96153 | 344 | &dev_attr_state.attr, |
62232e45 | 345 | &dev_attr_commands.attr, |
0ba1c634 | 346 | &dev_attr_available_slots.attr, |
62232e45 DW |
347 | NULL, |
348 | }; | |
349 | ||
350 | struct attribute_group nvdimm_attribute_group = { | |
351 | .attrs = nvdimm_attributes, | |
352 | }; | |
353 | EXPORT_SYMBOL_GPL(nvdimm_attribute_group); | |
354 | ||
e6dfb2de | 355 | struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data, |
62232e45 | 356 | const struct attribute_group **groups, unsigned long flags, |
e5ae3b25 DW |
357 | unsigned long cmd_mask, int num_flush, |
358 | struct resource *flush_wpq) | |
e6dfb2de DW |
359 | { |
360 | struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL); | |
361 | struct device *dev; | |
362 | ||
363 | if (!nvdimm) | |
364 | return NULL; | |
365 | ||
366 | nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL); | |
367 | if (nvdimm->id < 0) { | |
368 | kfree(nvdimm); | |
369 | return NULL; | |
370 | } | |
371 | nvdimm->provider_data = provider_data; | |
372 | nvdimm->flags = flags; | |
e3654eca | 373 | nvdimm->cmd_mask = cmd_mask; |
e5ae3b25 DW |
374 | nvdimm->num_flush = num_flush; |
375 | nvdimm->flush_wpq = flush_wpq; | |
eaf96153 | 376 | atomic_set(&nvdimm->busy, 0); |
e6dfb2de DW |
377 | dev = &nvdimm->dev; |
378 | dev_set_name(dev, "nmem%d", nvdimm->id); | |
379 | dev->parent = &nvdimm_bus->dev; | |
380 | dev->type = &nvdimm_device_type; | |
62232e45 | 381 | dev->devt = MKDEV(nvdimm_major, nvdimm->id); |
e6dfb2de | 382 | dev->groups = groups; |
4d88a97a | 383 | nd_device_register(dev); |
e6dfb2de DW |
384 | |
385 | return nvdimm; | |
386 | } | |
387 | EXPORT_SYMBOL_GPL(nvdimm_create); | |
4d88a97a | 388 | |
762d067d | 389 | int alias_dpa_busy(struct device *dev, void *data) |
a1f3e4d6 DW |
390 | { |
391 | resource_size_t map_end, blk_start, new, busy; | |
392 | struct blk_alloc_info *info = data; | |
393 | struct nd_mapping *nd_mapping; | |
394 | struct nd_region *nd_region; | |
395 | struct nvdimm_drvdata *ndd; | |
396 | struct resource *res; | |
397 | int i; | |
398 | ||
399 | if (!is_nd_pmem(dev)) | |
400 | return 0; | |
401 | ||
402 | nd_region = to_nd_region(dev); | |
403 | for (i = 0; i < nd_region->ndr_mappings; i++) { | |
404 | nd_mapping = &nd_region->mapping[i]; | |
405 | if (nd_mapping->nvdimm == info->nd_mapping->nvdimm) | |
406 | break; | |
407 | } | |
408 | ||
409 | if (i >= nd_region->ndr_mappings) | |
410 | return 0; | |
411 | ||
412 | ndd = to_ndd(nd_mapping); | |
413 | map_end = nd_mapping->start + nd_mapping->size - 1; | |
414 | blk_start = nd_mapping->start; | |
762d067d DW |
415 | |
416 | /* | |
417 | * In the allocation case ->res is set to free space that we are | |
418 | * looking to validate against PMEM aliasing collision rules | |
419 | * (i.e. BLK is allocated after all aliased PMEM). | |
420 | */ | |
421 | if (info->res) { | |
422 | if (info->res->start >= nd_mapping->start | |
423 | && info->res->start < map_end) | |
424 | /* pass */; | |
425 | else | |
426 | return 0; | |
427 | } | |
428 | ||
a1f3e4d6 DW |
429 | retry: |
430 | /* | |
431 | * Find the free dpa from the end of the last pmem allocation to | |
432 | * the end of the interleave-set mapping that is not already | |
433 | * covered by a blk allocation. | |
434 | */ | |
435 | busy = 0; | |
436 | for_each_dpa_resource(ndd, res) { | |
437 | if ((res->start >= blk_start && res->start < map_end) | |
438 | || (res->end >= blk_start | |
439 | && res->end <= map_end)) { | |
440 | if (strncmp(res->name, "pmem", 4) == 0) { | |
441 | new = max(blk_start, min(map_end + 1, | |
442 | res->end + 1)); | |
443 | if (new != blk_start) { | |
444 | blk_start = new; | |
445 | goto retry; | |
446 | } | |
447 | } else | |
448 | busy += min(map_end, res->end) | |
449 | - max(nd_mapping->start, res->start) + 1; | |
450 | } else if (nd_mapping->start > res->start | |
451 | && map_end < res->end) { | |
452 | /* total eclipse of the PMEM region mapping */ | |
453 | busy += nd_mapping->size; | |
454 | break; | |
455 | } | |
456 | } | |
457 | ||
762d067d DW |
458 | /* update the free space range with the probed blk_start */ |
459 | if (info->res && blk_start > info->res->start) { | |
460 | info->res->start = max(info->res->start, blk_start); | |
461 | if (info->res->start > info->res->end) | |
462 | info->res->end = info->res->start - 1; | |
463 | return 1; | |
464 | } | |
465 | ||
a1f3e4d6 | 466 | info->available -= blk_start - nd_mapping->start + busy; |
762d067d | 467 | |
a1f3e4d6 DW |
468 | return 0; |
469 | } | |
470 | ||
471 | static int blk_dpa_busy(struct device *dev, void *data) | |
472 | { | |
473 | struct blk_alloc_info *info = data; | |
474 | struct nd_mapping *nd_mapping; | |
475 | struct nd_region *nd_region; | |
476 | resource_size_t map_end; | |
477 | int i; | |
478 | ||
479 | if (!is_nd_pmem(dev)) | |
480 | return 0; | |
481 | ||
482 | nd_region = to_nd_region(dev); | |
483 | for (i = 0; i < nd_region->ndr_mappings; i++) { | |
484 | nd_mapping = &nd_region->mapping[i]; | |
485 | if (nd_mapping->nvdimm == info->nd_mapping->nvdimm) | |
486 | break; | |
487 | } | |
488 | ||
489 | if (i >= nd_region->ndr_mappings) | |
490 | return 0; | |
491 | ||
492 | map_end = nd_mapping->start + nd_mapping->size - 1; | |
493 | if (info->res->start >= nd_mapping->start | |
494 | && info->res->start < map_end) { | |
495 | if (info->res->end <= map_end) { | |
496 | info->busy = 0; | |
497 | return 1; | |
498 | } else { | |
499 | info->busy -= info->res->end - map_end; | |
500 | return 0; | |
501 | } | |
502 | } else if (info->res->end >= nd_mapping->start | |
503 | && info->res->end <= map_end) { | |
504 | info->busy -= nd_mapping->start - info->res->start; | |
505 | return 0; | |
506 | } else { | |
507 | info->busy -= nd_mapping->size; | |
508 | return 0; | |
509 | } | |
510 | } | |
511 | ||
1b40e09a DW |
512 | /** |
513 | * nd_blk_available_dpa - account the unused dpa of BLK region | |
514 | * @nd_mapping: container of dpa-resource-root + labels | |
515 | * | |
a1f3e4d6 DW |
516 | * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges, but |
517 | * we arrange for them to never start at an lower dpa than the last | |
518 | * PMEM allocation in an aliased region. | |
1b40e09a | 519 | */ |
a1f3e4d6 | 520 | resource_size_t nd_blk_available_dpa(struct nd_region *nd_region) |
1b40e09a | 521 | { |
a1f3e4d6 DW |
522 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); |
523 | struct nd_mapping *nd_mapping = &nd_region->mapping[0]; | |
1b40e09a | 524 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
a1f3e4d6 DW |
525 | struct blk_alloc_info info = { |
526 | .nd_mapping = nd_mapping, | |
527 | .available = nd_mapping->size, | |
762d067d | 528 | .res = NULL, |
a1f3e4d6 | 529 | }; |
1b40e09a DW |
530 | struct resource *res; |
531 | ||
532 | if (!ndd) | |
533 | return 0; | |
534 | ||
a1f3e4d6 | 535 | device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy); |
1b40e09a | 536 | |
a1f3e4d6 DW |
537 | /* now account for busy blk allocations in unaliased dpa */ |
538 | for_each_dpa_resource(ndd, res) { | |
539 | if (strncmp(res->name, "blk", 3) != 0) | |
540 | continue; | |
541 | ||
542 | info.res = res; | |
543 | info.busy = resource_size(res); | |
544 | device_for_each_child(&nvdimm_bus->dev, &info, blk_dpa_busy); | |
545 | info.available -= info.busy; | |
546 | } | |
547 | ||
548 | return info.available; | |
1b40e09a DW |
549 | } |
550 | ||
bf9bccc1 DW |
551 | /** |
552 | * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa | |
553 | * @nd_mapping: container of dpa-resource-root + labels | |
554 | * @nd_region: constrain available space check to this reference region | |
555 | * @overlap: calculate available space assuming this level of overlap | |
556 | * | |
557 | * Validate that a PMEM label, if present, aligns with the start of an | |
558 | * interleave set and truncate the available size at the lowest BLK | |
559 | * overlap point. | |
560 | * | |
561 | * The expectation is that this routine is called multiple times as it | |
562 | * probes for the largest BLK encroachment for any single member DIMM of | |
563 | * the interleave set. Once that value is determined the PMEM-limit for | |
564 | * the set can be established. | |
565 | */ | |
566 | resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region, | |
567 | struct nd_mapping *nd_mapping, resource_size_t *overlap) | |
568 | { | |
569 | resource_size_t map_start, map_end, busy = 0, available, blk_start; | |
570 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); | |
571 | struct resource *res; | |
572 | const char *reason; | |
573 | ||
574 | if (!ndd) | |
575 | return 0; | |
576 | ||
577 | map_start = nd_mapping->start; | |
578 | map_end = map_start + nd_mapping->size - 1; | |
579 | blk_start = max(map_start, map_end + 1 - *overlap); | |
a1f3e4d6 | 580 | for_each_dpa_resource(ndd, res) { |
bf9bccc1 DW |
581 | if (res->start >= map_start && res->start < map_end) { |
582 | if (strncmp(res->name, "blk", 3) == 0) | |
a1f3e4d6 DW |
583 | blk_start = min(blk_start, |
584 | max(map_start, res->start)); | |
585 | else if (res->end > map_end) { | |
bf9bccc1 DW |
586 | reason = "misaligned to iset"; |
587 | goto err; | |
a1f3e4d6 | 588 | } else |
bf9bccc1 | 589 | busy += resource_size(res); |
bf9bccc1 DW |
590 | } else if (res->end >= map_start && res->end <= map_end) { |
591 | if (strncmp(res->name, "blk", 3) == 0) { | |
592 | /* | |
593 | * If a BLK allocation overlaps the start of | |
594 | * PMEM the entire interleave set may now only | |
595 | * be used for BLK. | |
596 | */ | |
597 | blk_start = map_start; | |
a1f3e4d6 DW |
598 | } else |
599 | busy += resource_size(res); | |
bf9bccc1 DW |
600 | } else if (map_start > res->start && map_start < res->end) { |
601 | /* total eclipse of the mapping */ | |
602 | busy += nd_mapping->size; | |
603 | blk_start = map_start; | |
604 | } | |
a1f3e4d6 | 605 | } |
bf9bccc1 DW |
606 | |
607 | *overlap = map_end + 1 - blk_start; | |
608 | available = blk_start - map_start; | |
609 | if (busy < available) | |
610 | return available - busy; | |
611 | return 0; | |
612 | ||
613 | err: | |
bf9bccc1 DW |
614 | nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason); |
615 | return 0; | |
616 | } | |
617 | ||
4a826c83 DW |
618 | void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res) |
619 | { | |
620 | WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); | |
621 | kfree(res->name); | |
622 | __release_region(&ndd->dpa, res->start, resource_size(res)); | |
623 | } | |
624 | ||
625 | struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, | |
626 | struct nd_label_id *label_id, resource_size_t start, | |
627 | resource_size_t n) | |
628 | { | |
629 | char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL); | |
630 | struct resource *res; | |
631 | ||
632 | if (!name) | |
633 | return NULL; | |
634 | ||
635 | WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); | |
636 | res = __request_region(&ndd->dpa, start, n, name, 0); | |
637 | if (!res) | |
638 | kfree(name); | |
639 | return res; | |
640 | } | |
641 | ||
bf9bccc1 DW |
642 | /** |
643 | * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id | |
644 | * @nvdimm: container of dpa-resource-root + labels | |
645 | * @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid> | |
646 | */ | |
647 | resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd, | |
648 | struct nd_label_id *label_id) | |
649 | { | |
650 | resource_size_t allocated = 0; | |
651 | struct resource *res; | |
652 | ||
653 | for_each_dpa_resource(ndd, res) | |
654 | if (strcmp(res->name, label_id->id) == 0) | |
655 | allocated += resource_size(res); | |
656 | ||
657 | return allocated; | |
658 | } | |
659 | ||
4d88a97a DW |
660 | static int count_dimms(struct device *dev, void *c) |
661 | { | |
662 | int *count = c; | |
663 | ||
664 | if (is_nvdimm(dev)) | |
665 | (*count)++; | |
666 | return 0; | |
667 | } | |
668 | ||
669 | int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count) | |
670 | { | |
671 | int count = 0; | |
672 | /* Flush any possible dimm registration failures */ | |
673 | nd_synchronize(); | |
674 | ||
675 | device_for_each_child(&nvdimm_bus->dev, &count, count_dimms); | |
676 | dev_dbg(&nvdimm_bus->dev, "%s: count: %d\n", __func__, count); | |
677 | if (count != dimm_count) | |
678 | return -ENXIO; | |
679 | return 0; | |
680 | } | |
681 | EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count); | |
b354aba0 DW |
682 | |
683 | void __exit nvdimm_devs_exit(void) | |
684 | { | |
685 | ida_destroy(&dimm_ida); | |
686 | } |