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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 | ||
42237e39 DW |
187 | void nvdimm_set_aliasing(struct device *dev) |
188 | { | |
189 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
190 | ||
191 | nvdimm->flags |= NDD_ALIASING; | |
192 | } | |
193 | ||
e6dfb2de DW |
194 | static void nvdimm_release(struct device *dev) |
195 | { | |
196 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
197 | ||
198 | ida_simple_remove(&dimm_ida, nvdimm->id); | |
199 | kfree(nvdimm); | |
200 | } | |
201 | ||
202 | static struct device_type nvdimm_device_type = { | |
203 | .name = "nvdimm", | |
204 | .release = nvdimm_release, | |
205 | }; | |
206 | ||
62232e45 | 207 | bool is_nvdimm(struct device *dev) |
e6dfb2de DW |
208 | { |
209 | return dev->type == &nvdimm_device_type; | |
210 | } | |
211 | ||
212 | struct nvdimm *to_nvdimm(struct device *dev) | |
213 | { | |
214 | struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev); | |
215 | ||
216 | WARN_ON(!is_nvdimm(dev)); | |
217 | return nvdimm; | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(to_nvdimm); | |
220 | ||
047fc8a1 RZ |
221 | struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr) |
222 | { | |
223 | struct nd_region *nd_region = &ndbr->nd_region; | |
224 | struct nd_mapping *nd_mapping = &nd_region->mapping[0]; | |
225 | ||
226 | return nd_mapping->nvdimm; | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm); | |
229 | ||
bf9bccc1 DW |
230 | struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping) |
231 | { | |
232 | struct nvdimm *nvdimm = nd_mapping->nvdimm; | |
233 | ||
234 | WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev)); | |
235 | ||
236 | return dev_get_drvdata(&nvdimm->dev); | |
237 | } | |
238 | EXPORT_SYMBOL(to_ndd); | |
239 | ||
240 | void nvdimm_drvdata_release(struct kref *kref) | |
241 | { | |
242 | struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref); | |
243 | struct device *dev = ndd->dev; | |
244 | struct resource *res, *_r; | |
245 | ||
246 | dev_dbg(dev, "%s\n", __func__); | |
247 | ||
248 | nvdimm_bus_lock(dev); | |
249 | for_each_dpa_resource_safe(ndd, res, _r) | |
250 | nvdimm_free_dpa(ndd, res); | |
251 | nvdimm_bus_unlock(dev); | |
252 | ||
a06a7576 | 253 | kvfree(ndd->data); |
bf9bccc1 DW |
254 | kfree(ndd); |
255 | put_device(dev); | |
256 | } | |
257 | ||
258 | void get_ndd(struct nvdimm_drvdata *ndd) | |
259 | { | |
260 | kref_get(&ndd->kref); | |
261 | } | |
262 | ||
263 | void put_ndd(struct nvdimm_drvdata *ndd) | |
264 | { | |
265 | if (ndd) | |
266 | kref_put(&ndd->kref, nvdimm_drvdata_release); | |
267 | } | |
268 | ||
e6dfb2de DW |
269 | const char *nvdimm_name(struct nvdimm *nvdimm) |
270 | { | |
271 | return dev_name(&nvdimm->dev); | |
272 | } | |
273 | EXPORT_SYMBOL_GPL(nvdimm_name); | |
274 | ||
ba9c8dd3 DW |
275 | struct kobject *nvdimm_kobj(struct nvdimm *nvdimm) |
276 | { | |
277 | return &nvdimm->dev.kobj; | |
278 | } | |
279 | EXPORT_SYMBOL_GPL(nvdimm_kobj); | |
280 | ||
e3654eca DW |
281 | unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm) |
282 | { | |
283 | return nvdimm->cmd_mask; | |
284 | } | |
285 | EXPORT_SYMBOL_GPL(nvdimm_cmd_mask); | |
286 | ||
e6dfb2de DW |
287 | void *nvdimm_provider_data(struct nvdimm *nvdimm) |
288 | { | |
62232e45 DW |
289 | if (nvdimm) |
290 | return nvdimm->provider_data; | |
291 | return NULL; | |
e6dfb2de DW |
292 | } |
293 | EXPORT_SYMBOL_GPL(nvdimm_provider_data); | |
294 | ||
62232e45 DW |
295 | static ssize_t commands_show(struct device *dev, |
296 | struct device_attribute *attr, char *buf) | |
297 | { | |
298 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
299 | int cmd, len = 0; | |
300 | ||
e3654eca | 301 | if (!nvdimm->cmd_mask) |
62232e45 DW |
302 | return sprintf(buf, "\n"); |
303 | ||
e3654eca | 304 | for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG) |
62232e45 DW |
305 | len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd)); |
306 | len += sprintf(buf + len, "\n"); | |
307 | return len; | |
308 | } | |
309 | static DEVICE_ATTR_RO(commands); | |
310 | ||
eaf96153 DW |
311 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
312 | char *buf) | |
313 | { | |
314 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
315 | ||
316 | /* | |
317 | * The state may be in the process of changing, userspace should | |
318 | * quiesce probing if it wants a static answer | |
319 | */ | |
320 | nvdimm_bus_lock(dev); | |
321 | nvdimm_bus_unlock(dev); | |
322 | return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy) | |
323 | ? "active" : "idle"); | |
324 | } | |
325 | static DEVICE_ATTR_RO(state); | |
326 | ||
0ba1c634 DW |
327 | static ssize_t available_slots_show(struct device *dev, |
328 | struct device_attribute *attr, char *buf) | |
329 | { | |
330 | struct nvdimm_drvdata *ndd = dev_get_drvdata(dev); | |
331 | ssize_t rc; | |
332 | u32 nfree; | |
333 | ||
334 | if (!ndd) | |
335 | return -ENXIO; | |
336 | ||
337 | nvdimm_bus_lock(dev); | |
338 | nfree = nd_label_nfree(ndd); | |
339 | if (nfree - 1 > nfree) { | |
340 | dev_WARN_ONCE(dev, 1, "we ate our last label?\n"); | |
341 | nfree = 0; | |
342 | } else | |
343 | nfree--; | |
344 | rc = sprintf(buf, "%d\n", nfree); | |
345 | nvdimm_bus_unlock(dev); | |
346 | return rc; | |
347 | } | |
348 | static DEVICE_ATTR_RO(available_slots); | |
349 | ||
62232e45 | 350 | static struct attribute *nvdimm_attributes[] = { |
eaf96153 | 351 | &dev_attr_state.attr, |
62232e45 | 352 | &dev_attr_commands.attr, |
0ba1c634 | 353 | &dev_attr_available_slots.attr, |
62232e45 DW |
354 | NULL, |
355 | }; | |
356 | ||
357 | struct attribute_group nvdimm_attribute_group = { | |
358 | .attrs = nvdimm_attributes, | |
359 | }; | |
360 | EXPORT_SYMBOL_GPL(nvdimm_attribute_group); | |
361 | ||
e6dfb2de | 362 | struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data, |
62232e45 | 363 | const struct attribute_group **groups, unsigned long flags, |
e5ae3b25 DW |
364 | unsigned long cmd_mask, int num_flush, |
365 | struct resource *flush_wpq) | |
e6dfb2de DW |
366 | { |
367 | struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL); | |
368 | struct device *dev; | |
369 | ||
370 | if (!nvdimm) | |
371 | return NULL; | |
372 | ||
373 | nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL); | |
374 | if (nvdimm->id < 0) { | |
375 | kfree(nvdimm); | |
376 | return NULL; | |
377 | } | |
378 | nvdimm->provider_data = provider_data; | |
379 | nvdimm->flags = flags; | |
e3654eca | 380 | nvdimm->cmd_mask = cmd_mask; |
e5ae3b25 DW |
381 | nvdimm->num_flush = num_flush; |
382 | nvdimm->flush_wpq = flush_wpq; | |
eaf96153 | 383 | atomic_set(&nvdimm->busy, 0); |
e6dfb2de DW |
384 | dev = &nvdimm->dev; |
385 | dev_set_name(dev, "nmem%d", nvdimm->id); | |
386 | dev->parent = &nvdimm_bus->dev; | |
387 | dev->type = &nvdimm_device_type; | |
62232e45 | 388 | dev->devt = MKDEV(nvdimm_major, nvdimm->id); |
e6dfb2de | 389 | dev->groups = groups; |
4d88a97a | 390 | nd_device_register(dev); |
e6dfb2de DW |
391 | |
392 | return nvdimm; | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(nvdimm_create); | |
4d88a97a | 395 | |
762d067d | 396 | int alias_dpa_busy(struct device *dev, void *data) |
a1f3e4d6 | 397 | { |
6df68d89 | 398 | resource_size_t map_end, blk_start, new; |
a1f3e4d6 DW |
399 | struct blk_alloc_info *info = data; |
400 | struct nd_mapping *nd_mapping; | |
401 | struct nd_region *nd_region; | |
402 | struct nvdimm_drvdata *ndd; | |
403 | struct resource *res; | |
404 | int i; | |
405 | ||
406 | if (!is_nd_pmem(dev)) | |
407 | return 0; | |
408 | ||
409 | nd_region = to_nd_region(dev); | |
410 | for (i = 0; i < nd_region->ndr_mappings; i++) { | |
411 | nd_mapping = &nd_region->mapping[i]; | |
412 | if (nd_mapping->nvdimm == info->nd_mapping->nvdimm) | |
413 | break; | |
414 | } | |
415 | ||
416 | if (i >= nd_region->ndr_mappings) | |
417 | return 0; | |
418 | ||
419 | ndd = to_ndd(nd_mapping); | |
420 | map_end = nd_mapping->start + nd_mapping->size - 1; | |
421 | blk_start = nd_mapping->start; | |
762d067d DW |
422 | |
423 | /* | |
424 | * In the allocation case ->res is set to free space that we are | |
425 | * looking to validate against PMEM aliasing collision rules | |
426 | * (i.e. BLK is allocated after all aliased PMEM). | |
427 | */ | |
428 | if (info->res) { | |
429 | if (info->res->start >= nd_mapping->start | |
430 | && info->res->start < map_end) | |
431 | /* pass */; | |
432 | else | |
433 | return 0; | |
434 | } | |
435 | ||
a1f3e4d6 DW |
436 | retry: |
437 | /* | |
438 | * Find the free dpa from the end of the last pmem allocation to | |
6df68d89 | 439 | * the end of the interleave-set mapping. |
a1f3e4d6 | 440 | */ |
a1f3e4d6 | 441 | for_each_dpa_resource(ndd, res) { |
6df68d89 DW |
442 | if (strncmp(res->name, "pmem", 4) != 0) |
443 | continue; | |
a1f3e4d6 DW |
444 | if ((res->start >= blk_start && res->start < map_end) |
445 | || (res->end >= blk_start | |
446 | && res->end <= map_end)) { | |
6df68d89 DW |
447 | new = max(blk_start, min(map_end + 1, res->end + 1)); |
448 | if (new != blk_start) { | |
449 | blk_start = new; | |
450 | goto retry; | |
451 | } | |
a1f3e4d6 DW |
452 | } |
453 | } | |
454 | ||
762d067d DW |
455 | /* update the free space range with the probed blk_start */ |
456 | if (info->res && blk_start > info->res->start) { | |
457 | info->res->start = max(info->res->start, blk_start); | |
458 | if (info->res->start > info->res->end) | |
459 | info->res->end = info->res->start - 1; | |
460 | return 1; | |
461 | } | |
462 | ||
6df68d89 | 463 | info->available -= blk_start - nd_mapping->start; |
762d067d | 464 | |
a1f3e4d6 DW |
465 | return 0; |
466 | } | |
467 | ||
1b40e09a DW |
468 | /** |
469 | * nd_blk_available_dpa - account the unused dpa of BLK region | |
470 | * @nd_mapping: container of dpa-resource-root + labels | |
471 | * | |
a1f3e4d6 DW |
472 | * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges, but |
473 | * we arrange for them to never start at an lower dpa than the last | |
474 | * PMEM allocation in an aliased region. | |
1b40e09a | 475 | */ |
a1f3e4d6 | 476 | resource_size_t nd_blk_available_dpa(struct nd_region *nd_region) |
1b40e09a | 477 | { |
a1f3e4d6 DW |
478 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); |
479 | struct nd_mapping *nd_mapping = &nd_region->mapping[0]; | |
1b40e09a | 480 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); |
a1f3e4d6 DW |
481 | struct blk_alloc_info info = { |
482 | .nd_mapping = nd_mapping, | |
483 | .available = nd_mapping->size, | |
762d067d | 484 | .res = NULL, |
a1f3e4d6 | 485 | }; |
1b40e09a DW |
486 | struct resource *res; |
487 | ||
488 | if (!ndd) | |
489 | return 0; | |
490 | ||
a1f3e4d6 | 491 | device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy); |
1b40e09a | 492 | |
a1f3e4d6 DW |
493 | /* now account for busy blk allocations in unaliased dpa */ |
494 | for_each_dpa_resource(ndd, res) { | |
495 | if (strncmp(res->name, "blk", 3) != 0) | |
496 | continue; | |
6df68d89 | 497 | info.available -= resource_size(res); |
a1f3e4d6 DW |
498 | } |
499 | ||
500 | return info.available; | |
1b40e09a DW |
501 | } |
502 | ||
bf9bccc1 DW |
503 | /** |
504 | * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa | |
505 | * @nd_mapping: container of dpa-resource-root + labels | |
506 | * @nd_region: constrain available space check to this reference region | |
507 | * @overlap: calculate available space assuming this level of overlap | |
508 | * | |
509 | * Validate that a PMEM label, if present, aligns with the start of an | |
510 | * interleave set and truncate the available size at the lowest BLK | |
511 | * overlap point. | |
512 | * | |
513 | * The expectation is that this routine is called multiple times as it | |
514 | * probes for the largest BLK encroachment for any single member DIMM of | |
515 | * the interleave set. Once that value is determined the PMEM-limit for | |
516 | * the set can be established. | |
517 | */ | |
518 | resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region, | |
519 | struct nd_mapping *nd_mapping, resource_size_t *overlap) | |
520 | { | |
521 | resource_size_t map_start, map_end, busy = 0, available, blk_start; | |
522 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); | |
523 | struct resource *res; | |
524 | const char *reason; | |
525 | ||
526 | if (!ndd) | |
527 | return 0; | |
528 | ||
529 | map_start = nd_mapping->start; | |
530 | map_end = map_start + nd_mapping->size - 1; | |
531 | blk_start = max(map_start, map_end + 1 - *overlap); | |
a1f3e4d6 | 532 | for_each_dpa_resource(ndd, res) { |
bf9bccc1 DW |
533 | if (res->start >= map_start && res->start < map_end) { |
534 | if (strncmp(res->name, "blk", 3) == 0) | |
a1f3e4d6 DW |
535 | blk_start = min(blk_start, |
536 | max(map_start, res->start)); | |
537 | else if (res->end > map_end) { | |
bf9bccc1 DW |
538 | reason = "misaligned to iset"; |
539 | goto err; | |
a1f3e4d6 | 540 | } else |
bf9bccc1 | 541 | busy += resource_size(res); |
bf9bccc1 DW |
542 | } else if (res->end >= map_start && res->end <= map_end) { |
543 | if (strncmp(res->name, "blk", 3) == 0) { | |
544 | /* | |
545 | * If a BLK allocation overlaps the start of | |
546 | * PMEM the entire interleave set may now only | |
547 | * be used for BLK. | |
548 | */ | |
549 | blk_start = map_start; | |
a1f3e4d6 DW |
550 | } else |
551 | busy += resource_size(res); | |
bf9bccc1 DW |
552 | } else if (map_start > res->start && map_start < res->end) { |
553 | /* total eclipse of the mapping */ | |
554 | busy += nd_mapping->size; | |
555 | blk_start = map_start; | |
556 | } | |
a1f3e4d6 | 557 | } |
bf9bccc1 DW |
558 | |
559 | *overlap = map_end + 1 - blk_start; | |
560 | available = blk_start - map_start; | |
561 | if (busy < available) | |
562 | return available - busy; | |
563 | return 0; | |
564 | ||
565 | err: | |
bf9bccc1 DW |
566 | nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason); |
567 | return 0; | |
568 | } | |
569 | ||
4a826c83 DW |
570 | void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res) |
571 | { | |
572 | WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); | |
573 | kfree(res->name); | |
574 | __release_region(&ndd->dpa, res->start, resource_size(res)); | |
575 | } | |
576 | ||
577 | struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, | |
578 | struct nd_label_id *label_id, resource_size_t start, | |
579 | resource_size_t n) | |
580 | { | |
581 | char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL); | |
582 | struct resource *res; | |
583 | ||
584 | if (!name) | |
585 | return NULL; | |
586 | ||
587 | WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); | |
588 | res = __request_region(&ndd->dpa, start, n, name, 0); | |
589 | if (!res) | |
590 | kfree(name); | |
591 | return res; | |
592 | } | |
593 | ||
bf9bccc1 DW |
594 | /** |
595 | * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id | |
596 | * @nvdimm: container of dpa-resource-root + labels | |
597 | * @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid> | |
598 | */ | |
599 | resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd, | |
600 | struct nd_label_id *label_id) | |
601 | { | |
602 | resource_size_t allocated = 0; | |
603 | struct resource *res; | |
604 | ||
605 | for_each_dpa_resource(ndd, res) | |
606 | if (strcmp(res->name, label_id->id) == 0) | |
607 | allocated += resource_size(res); | |
608 | ||
609 | return allocated; | |
610 | } | |
611 | ||
4d88a97a DW |
612 | static int count_dimms(struct device *dev, void *c) |
613 | { | |
614 | int *count = c; | |
615 | ||
616 | if (is_nvdimm(dev)) | |
617 | (*count)++; | |
618 | return 0; | |
619 | } | |
620 | ||
621 | int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count) | |
622 | { | |
623 | int count = 0; | |
624 | /* Flush any possible dimm registration failures */ | |
625 | nd_synchronize(); | |
626 | ||
627 | device_for_each_child(&nvdimm_bus->dev, &count, count_dimms); | |
628 | dev_dbg(&nvdimm_bus->dev, "%s: count: %d\n", __func__, count); | |
629 | if (count != dimm_count) | |
630 | return -ENXIO; | |
631 | return 0; | |
632 | } | |
633 | EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count); | |
b354aba0 DW |
634 | |
635 | void __exit nvdimm_devs_exit(void) | |
636 | { | |
637 | ida_destroy(&dimm_ida); | |
638 | } |