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b94d5230 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/list_sort.h> | |
14 | #include <linux/libnvdimm.h> | |
15 | #include <linux/module.h> | |
62232e45 | 16 | #include <linux/ndctl.h> |
b94d5230 DW |
17 | #include <linux/list.h> |
18 | #include <linux/acpi.h> | |
19 | #include "nfit.h" | |
20 | ||
4d88a97a DW |
21 | static bool force_enable_dimms; |
22 | module_param(force_enable_dimms, bool, S_IRUGO|S_IWUSR); | |
23 | MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status"); | |
24 | ||
b94d5230 DW |
25 | static u8 nfit_uuid[NFIT_UUID_MAX][16]; |
26 | ||
27 | static const u8 *to_nfit_uuid(enum nfit_uuids id) | |
28 | { | |
29 | return nfit_uuid[id]; | |
30 | } | |
31 | ||
62232e45 DW |
32 | static struct acpi_nfit_desc *to_acpi_nfit_desc( |
33 | struct nvdimm_bus_descriptor *nd_desc) | |
34 | { | |
35 | return container_of(nd_desc, struct acpi_nfit_desc, nd_desc); | |
36 | } | |
37 | ||
38 | static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc) | |
39 | { | |
40 | struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc; | |
41 | ||
42 | /* | |
43 | * If provider == 'ACPI.NFIT' we can assume 'dev' is a struct | |
44 | * acpi_device. | |
45 | */ | |
46 | if (!nd_desc->provider_name | |
47 | || strcmp(nd_desc->provider_name, "ACPI.NFIT") != 0) | |
48 | return NULL; | |
49 | ||
50 | return to_acpi_device(acpi_desc->dev); | |
51 | } | |
52 | ||
b94d5230 DW |
53 | static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, |
54 | struct nvdimm *nvdimm, unsigned int cmd, void *buf, | |
55 | unsigned int buf_len) | |
56 | { | |
62232e45 DW |
57 | struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc); |
58 | const struct nd_cmd_desc *desc = NULL; | |
59 | union acpi_object in_obj, in_buf, *out_obj; | |
60 | struct device *dev = acpi_desc->dev; | |
61 | const char *cmd_name, *dimm_name; | |
62 | unsigned long dsm_mask; | |
63 | acpi_handle handle; | |
64 | const u8 *uuid; | |
65 | u32 offset; | |
66 | int rc, i; | |
67 | ||
68 | if (nvdimm) { | |
69 | struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); | |
70 | struct acpi_device *adev = nfit_mem->adev; | |
71 | ||
72 | if (!adev) | |
73 | return -ENOTTY; | |
74 | dimm_name = dev_name(&adev->dev); | |
75 | cmd_name = nvdimm_cmd_name(cmd); | |
76 | dsm_mask = nfit_mem->dsm_mask; | |
77 | desc = nd_cmd_dimm_desc(cmd); | |
78 | uuid = to_nfit_uuid(NFIT_DEV_DIMM); | |
79 | handle = adev->handle; | |
80 | } else { | |
81 | struct acpi_device *adev = to_acpi_dev(acpi_desc); | |
82 | ||
83 | cmd_name = nvdimm_bus_cmd_name(cmd); | |
84 | dsm_mask = nd_desc->dsm_mask; | |
85 | desc = nd_cmd_bus_desc(cmd); | |
86 | uuid = to_nfit_uuid(NFIT_DEV_BUS); | |
87 | handle = adev->handle; | |
88 | dimm_name = "bus"; | |
89 | } | |
90 | ||
91 | if (!desc || (cmd && (desc->out_num + desc->in_num == 0))) | |
92 | return -ENOTTY; | |
93 | ||
94 | if (!test_bit(cmd, &dsm_mask)) | |
95 | return -ENOTTY; | |
96 | ||
97 | in_obj.type = ACPI_TYPE_PACKAGE; | |
98 | in_obj.package.count = 1; | |
99 | in_obj.package.elements = &in_buf; | |
100 | in_buf.type = ACPI_TYPE_BUFFER; | |
101 | in_buf.buffer.pointer = buf; | |
102 | in_buf.buffer.length = 0; | |
103 | ||
104 | /* libnvdimm has already validated the input envelope */ | |
105 | for (i = 0; i < desc->in_num; i++) | |
106 | in_buf.buffer.length += nd_cmd_in_size(nvdimm, cmd, desc, | |
107 | i, buf); | |
108 | ||
109 | if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) { | |
110 | dev_dbg(dev, "%s:%s cmd: %s input length: %d\n", __func__, | |
111 | dimm_name, cmd_name, in_buf.buffer.length); | |
112 | print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4, | |
113 | 4, in_buf.buffer.pointer, min_t(u32, 128, | |
114 | in_buf.buffer.length), true); | |
115 | } | |
116 | ||
117 | out_obj = acpi_evaluate_dsm(handle, uuid, 1, cmd, &in_obj); | |
118 | if (!out_obj) { | |
119 | dev_dbg(dev, "%s:%s _DSM failed cmd: %s\n", __func__, dimm_name, | |
120 | cmd_name); | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | if (out_obj->package.type != ACPI_TYPE_BUFFER) { | |
125 | dev_dbg(dev, "%s:%s unexpected output object type cmd: %s type: %d\n", | |
126 | __func__, dimm_name, cmd_name, out_obj->type); | |
127 | rc = -EINVAL; | |
128 | goto out; | |
129 | } | |
130 | ||
131 | if (IS_ENABLED(CONFIG_ACPI_NFIT_DEBUG)) { | |
132 | dev_dbg(dev, "%s:%s cmd: %s output length: %d\n", __func__, | |
133 | dimm_name, cmd_name, out_obj->buffer.length); | |
134 | print_hex_dump_debug(cmd_name, DUMP_PREFIX_OFFSET, 4, | |
135 | 4, out_obj->buffer.pointer, min_t(u32, 128, | |
136 | out_obj->buffer.length), true); | |
137 | } | |
138 | ||
139 | for (i = 0, offset = 0; i < desc->out_num; i++) { | |
140 | u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf, | |
141 | (u32 *) out_obj->buffer.pointer); | |
142 | ||
143 | if (offset + out_size > out_obj->buffer.length) { | |
144 | dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n", | |
145 | __func__, dimm_name, cmd_name, i); | |
146 | break; | |
147 | } | |
148 | ||
149 | if (in_buf.buffer.length + offset + out_size > buf_len) { | |
150 | dev_dbg(dev, "%s:%s output overrun cmd: %s field: %d\n", | |
151 | __func__, dimm_name, cmd_name, i); | |
152 | rc = -ENXIO; | |
153 | goto out; | |
154 | } | |
155 | memcpy(buf + in_buf.buffer.length + offset, | |
156 | out_obj->buffer.pointer + offset, out_size); | |
157 | offset += out_size; | |
158 | } | |
159 | if (offset + in_buf.buffer.length < buf_len) { | |
160 | if (i >= 1) { | |
161 | /* | |
162 | * status valid, return the number of bytes left | |
163 | * unfilled in the output buffer | |
164 | */ | |
165 | rc = buf_len - offset - in_buf.buffer.length; | |
166 | } else { | |
167 | dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n", | |
168 | __func__, dimm_name, cmd_name, buf_len, | |
169 | offset); | |
170 | rc = -ENXIO; | |
171 | } | |
172 | } else | |
173 | rc = 0; | |
174 | ||
175 | out: | |
176 | ACPI_FREE(out_obj); | |
177 | ||
178 | return rc; | |
b94d5230 DW |
179 | } |
180 | ||
181 | static const char *spa_type_name(u16 type) | |
182 | { | |
183 | static const char *to_name[] = { | |
184 | [NFIT_SPA_VOLATILE] = "volatile", | |
185 | [NFIT_SPA_PM] = "pmem", | |
186 | [NFIT_SPA_DCR] = "dimm-control-region", | |
187 | [NFIT_SPA_BDW] = "block-data-window", | |
188 | [NFIT_SPA_VDISK] = "volatile-disk", | |
189 | [NFIT_SPA_VCD] = "volatile-cd", | |
190 | [NFIT_SPA_PDISK] = "persistent-disk", | |
191 | [NFIT_SPA_PCD] = "persistent-cd", | |
192 | ||
193 | }; | |
194 | ||
195 | if (type > NFIT_SPA_PCD) | |
196 | return "unknown"; | |
197 | ||
198 | return to_name[type]; | |
199 | } | |
200 | ||
201 | static int nfit_spa_type(struct acpi_nfit_system_address *spa) | |
202 | { | |
203 | int i; | |
204 | ||
205 | for (i = 0; i < NFIT_UUID_MAX; i++) | |
206 | if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0) | |
207 | return i; | |
208 | return -1; | |
209 | } | |
210 | ||
211 | static bool add_spa(struct acpi_nfit_desc *acpi_desc, | |
212 | struct acpi_nfit_system_address *spa) | |
213 | { | |
214 | struct device *dev = acpi_desc->dev; | |
215 | struct nfit_spa *nfit_spa = devm_kzalloc(dev, sizeof(*nfit_spa), | |
216 | GFP_KERNEL); | |
217 | ||
218 | if (!nfit_spa) | |
219 | return false; | |
220 | INIT_LIST_HEAD(&nfit_spa->list); | |
221 | nfit_spa->spa = spa; | |
222 | list_add_tail(&nfit_spa->list, &acpi_desc->spas); | |
223 | dev_dbg(dev, "%s: spa index: %d type: %s\n", __func__, | |
224 | spa->range_index, | |
225 | spa_type_name(nfit_spa_type(spa))); | |
226 | return true; | |
227 | } | |
228 | ||
229 | static bool add_memdev(struct acpi_nfit_desc *acpi_desc, | |
230 | struct acpi_nfit_memory_map *memdev) | |
231 | { | |
232 | struct device *dev = acpi_desc->dev; | |
233 | struct nfit_memdev *nfit_memdev = devm_kzalloc(dev, | |
234 | sizeof(*nfit_memdev), GFP_KERNEL); | |
235 | ||
236 | if (!nfit_memdev) | |
237 | return false; | |
238 | INIT_LIST_HEAD(&nfit_memdev->list); | |
239 | nfit_memdev->memdev = memdev; | |
240 | list_add_tail(&nfit_memdev->list, &acpi_desc->memdevs); | |
241 | dev_dbg(dev, "%s: memdev handle: %#x spa: %d dcr: %d\n", | |
242 | __func__, memdev->device_handle, memdev->range_index, | |
243 | memdev->region_index); | |
244 | return true; | |
245 | } | |
246 | ||
247 | static bool add_dcr(struct acpi_nfit_desc *acpi_desc, | |
248 | struct acpi_nfit_control_region *dcr) | |
249 | { | |
250 | struct device *dev = acpi_desc->dev; | |
251 | struct nfit_dcr *nfit_dcr = devm_kzalloc(dev, sizeof(*nfit_dcr), | |
252 | GFP_KERNEL); | |
253 | ||
254 | if (!nfit_dcr) | |
255 | return false; | |
256 | INIT_LIST_HEAD(&nfit_dcr->list); | |
257 | nfit_dcr->dcr = dcr; | |
258 | list_add_tail(&nfit_dcr->list, &acpi_desc->dcrs); | |
259 | dev_dbg(dev, "%s: dcr index: %d windows: %d\n", __func__, | |
260 | dcr->region_index, dcr->windows); | |
261 | return true; | |
262 | } | |
263 | ||
264 | static bool add_bdw(struct acpi_nfit_desc *acpi_desc, | |
265 | struct acpi_nfit_data_region *bdw) | |
266 | { | |
267 | struct device *dev = acpi_desc->dev; | |
268 | struct nfit_bdw *nfit_bdw = devm_kzalloc(dev, sizeof(*nfit_bdw), | |
269 | GFP_KERNEL); | |
270 | ||
271 | if (!nfit_bdw) | |
272 | return false; | |
273 | INIT_LIST_HEAD(&nfit_bdw->list); | |
274 | nfit_bdw->bdw = bdw; | |
275 | list_add_tail(&nfit_bdw->list, &acpi_desc->bdws); | |
276 | dev_dbg(dev, "%s: bdw dcr: %d windows: %d\n", __func__, | |
277 | bdw->region_index, bdw->windows); | |
278 | return true; | |
279 | } | |
280 | ||
281 | static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table, | |
282 | const void *end) | |
283 | { | |
284 | struct device *dev = acpi_desc->dev; | |
285 | struct acpi_nfit_header *hdr; | |
286 | void *err = ERR_PTR(-ENOMEM); | |
287 | ||
288 | if (table >= end) | |
289 | return NULL; | |
290 | ||
291 | hdr = table; | |
292 | switch (hdr->type) { | |
293 | case ACPI_NFIT_TYPE_SYSTEM_ADDRESS: | |
294 | if (!add_spa(acpi_desc, table)) | |
295 | return err; | |
296 | break; | |
297 | case ACPI_NFIT_TYPE_MEMORY_MAP: | |
298 | if (!add_memdev(acpi_desc, table)) | |
299 | return err; | |
300 | break; | |
301 | case ACPI_NFIT_TYPE_CONTROL_REGION: | |
302 | if (!add_dcr(acpi_desc, table)) | |
303 | return err; | |
304 | break; | |
305 | case ACPI_NFIT_TYPE_DATA_REGION: | |
306 | if (!add_bdw(acpi_desc, table)) | |
307 | return err; | |
308 | break; | |
309 | /* TODO */ | |
310 | case ACPI_NFIT_TYPE_INTERLEAVE: | |
311 | dev_dbg(dev, "%s: idt\n", __func__); | |
312 | break; | |
313 | case ACPI_NFIT_TYPE_FLUSH_ADDRESS: | |
314 | dev_dbg(dev, "%s: flush\n", __func__); | |
315 | break; | |
316 | case ACPI_NFIT_TYPE_SMBIOS: | |
317 | dev_dbg(dev, "%s: smbios\n", __func__); | |
318 | break; | |
319 | default: | |
320 | dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type); | |
321 | break; | |
322 | } | |
323 | ||
324 | return table + hdr->length; | |
325 | } | |
326 | ||
327 | static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc, | |
328 | struct nfit_mem *nfit_mem) | |
329 | { | |
330 | u32 device_handle = __to_nfit_memdev(nfit_mem)->device_handle; | |
331 | u16 dcr = nfit_mem->dcr->region_index; | |
332 | struct nfit_spa *nfit_spa; | |
333 | ||
334 | list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { | |
335 | u16 range_index = nfit_spa->spa->range_index; | |
336 | int type = nfit_spa_type(nfit_spa->spa); | |
337 | struct nfit_memdev *nfit_memdev; | |
338 | ||
339 | if (type != NFIT_SPA_BDW) | |
340 | continue; | |
341 | ||
342 | list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) { | |
343 | if (nfit_memdev->memdev->range_index != range_index) | |
344 | continue; | |
345 | if (nfit_memdev->memdev->device_handle != device_handle) | |
346 | continue; | |
347 | if (nfit_memdev->memdev->region_index != dcr) | |
348 | continue; | |
349 | ||
350 | nfit_mem->spa_bdw = nfit_spa->spa; | |
351 | return; | |
352 | } | |
353 | } | |
354 | ||
355 | dev_dbg(acpi_desc->dev, "SPA-BDW not found for SPA-DCR %d\n", | |
356 | nfit_mem->spa_dcr->range_index); | |
357 | nfit_mem->bdw = NULL; | |
358 | } | |
359 | ||
360 | static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc, | |
361 | struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa) | |
362 | { | |
363 | u16 dcr = __to_nfit_memdev(nfit_mem)->region_index; | |
364 | struct nfit_dcr *nfit_dcr; | |
365 | struct nfit_bdw *nfit_bdw; | |
366 | ||
367 | list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) { | |
368 | if (nfit_dcr->dcr->region_index != dcr) | |
369 | continue; | |
370 | nfit_mem->dcr = nfit_dcr->dcr; | |
371 | break; | |
372 | } | |
373 | ||
374 | if (!nfit_mem->dcr) { | |
375 | dev_dbg(acpi_desc->dev, "SPA %d missing:%s%s\n", | |
376 | spa->range_index, __to_nfit_memdev(nfit_mem) | |
377 | ? "" : " MEMDEV", nfit_mem->dcr ? "" : " DCR"); | |
378 | return -ENODEV; | |
379 | } | |
380 | ||
381 | /* | |
382 | * We've found enough to create an nvdimm, optionally | |
383 | * find an associated BDW | |
384 | */ | |
385 | list_add(&nfit_mem->list, &acpi_desc->dimms); | |
386 | ||
387 | list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) { | |
388 | if (nfit_bdw->bdw->region_index != dcr) | |
389 | continue; | |
390 | nfit_mem->bdw = nfit_bdw->bdw; | |
391 | break; | |
392 | } | |
393 | ||
394 | if (!nfit_mem->bdw) | |
395 | return 0; | |
396 | ||
397 | nfit_mem_find_spa_bdw(acpi_desc, nfit_mem); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc, | |
402 | struct acpi_nfit_system_address *spa) | |
403 | { | |
404 | struct nfit_mem *nfit_mem, *found; | |
405 | struct nfit_memdev *nfit_memdev; | |
406 | int type = nfit_spa_type(spa); | |
407 | u16 dcr; | |
408 | ||
409 | switch (type) { | |
410 | case NFIT_SPA_DCR: | |
411 | case NFIT_SPA_PM: | |
412 | break; | |
413 | default: | |
414 | return 0; | |
415 | } | |
416 | ||
417 | list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) { | |
418 | int rc; | |
419 | ||
420 | if (nfit_memdev->memdev->range_index != spa->range_index) | |
421 | continue; | |
422 | found = NULL; | |
423 | dcr = nfit_memdev->memdev->region_index; | |
424 | list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) | |
425 | if (__to_nfit_memdev(nfit_mem)->region_index == dcr) { | |
426 | found = nfit_mem; | |
427 | break; | |
428 | } | |
429 | ||
430 | if (found) | |
431 | nfit_mem = found; | |
432 | else { | |
433 | nfit_mem = devm_kzalloc(acpi_desc->dev, | |
434 | sizeof(*nfit_mem), GFP_KERNEL); | |
435 | if (!nfit_mem) | |
436 | return -ENOMEM; | |
437 | INIT_LIST_HEAD(&nfit_mem->list); | |
438 | } | |
439 | ||
440 | if (type == NFIT_SPA_DCR) { | |
441 | /* multiple dimms may share a SPA when interleaved */ | |
442 | nfit_mem->spa_dcr = spa; | |
443 | nfit_mem->memdev_dcr = nfit_memdev->memdev; | |
444 | } else { | |
445 | /* | |
446 | * A single dimm may belong to multiple SPA-PM | |
447 | * ranges, record at least one in addition to | |
448 | * any SPA-DCR range. | |
449 | */ | |
450 | nfit_mem->memdev_pmem = nfit_memdev->memdev; | |
451 | } | |
452 | ||
453 | if (found) | |
454 | continue; | |
455 | ||
456 | rc = nfit_mem_add(acpi_desc, nfit_mem, spa); | |
457 | if (rc) | |
458 | return rc; | |
459 | } | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | static int nfit_mem_cmp(void *priv, struct list_head *_a, struct list_head *_b) | |
465 | { | |
466 | struct nfit_mem *a = container_of(_a, typeof(*a), list); | |
467 | struct nfit_mem *b = container_of(_b, typeof(*b), list); | |
468 | u32 handleA, handleB; | |
469 | ||
470 | handleA = __to_nfit_memdev(a)->device_handle; | |
471 | handleB = __to_nfit_memdev(b)->device_handle; | |
472 | if (handleA < handleB) | |
473 | return -1; | |
474 | else if (handleA > handleB) | |
475 | return 1; | |
476 | return 0; | |
477 | } | |
478 | ||
479 | static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc) | |
480 | { | |
481 | struct nfit_spa *nfit_spa; | |
482 | ||
483 | /* | |
484 | * For each SPA-DCR or SPA-PMEM address range find its | |
485 | * corresponding MEMDEV(s). From each MEMDEV find the | |
486 | * corresponding DCR. Then, if we're operating on a SPA-DCR, | |
487 | * try to find a SPA-BDW and a corresponding BDW that references | |
488 | * the DCR. Throw it all into an nfit_mem object. Note, that | |
489 | * BDWs are optional. | |
490 | */ | |
491 | list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { | |
492 | int rc; | |
493 | ||
494 | rc = nfit_mem_dcr_init(acpi_desc, nfit_spa->spa); | |
495 | if (rc) | |
496 | return rc; | |
497 | } | |
498 | ||
499 | list_sort(NULL, &acpi_desc->dimms, nfit_mem_cmp); | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
45def22c DW |
504 | static ssize_t revision_show(struct device *dev, |
505 | struct device_attribute *attr, char *buf) | |
506 | { | |
507 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
508 | struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus); | |
509 | struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc); | |
510 | ||
511 | return sprintf(buf, "%d\n", acpi_desc->nfit->header.revision); | |
512 | } | |
513 | static DEVICE_ATTR_RO(revision); | |
514 | ||
515 | static struct attribute *acpi_nfit_attributes[] = { | |
516 | &dev_attr_revision.attr, | |
517 | NULL, | |
518 | }; | |
519 | ||
520 | static struct attribute_group acpi_nfit_attribute_group = { | |
521 | .name = "nfit", | |
522 | .attrs = acpi_nfit_attributes, | |
523 | }; | |
524 | ||
525 | static const struct attribute_group *acpi_nfit_attribute_groups[] = { | |
526 | &nvdimm_bus_attribute_group, | |
527 | &acpi_nfit_attribute_group, | |
528 | NULL, | |
529 | }; | |
530 | ||
e6dfb2de DW |
531 | static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev) |
532 | { | |
533 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
534 | struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); | |
535 | ||
536 | return __to_nfit_memdev(nfit_mem); | |
537 | } | |
538 | ||
539 | static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev) | |
540 | { | |
541 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
542 | struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); | |
543 | ||
544 | return nfit_mem->dcr; | |
545 | } | |
546 | ||
547 | static ssize_t handle_show(struct device *dev, | |
548 | struct device_attribute *attr, char *buf) | |
549 | { | |
550 | struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev); | |
551 | ||
552 | return sprintf(buf, "%#x\n", memdev->device_handle); | |
553 | } | |
554 | static DEVICE_ATTR_RO(handle); | |
555 | ||
556 | static ssize_t phys_id_show(struct device *dev, | |
557 | struct device_attribute *attr, char *buf) | |
558 | { | |
559 | struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev); | |
560 | ||
561 | return sprintf(buf, "%#x\n", memdev->physical_id); | |
562 | } | |
563 | static DEVICE_ATTR_RO(phys_id); | |
564 | ||
565 | static ssize_t vendor_show(struct device *dev, | |
566 | struct device_attribute *attr, char *buf) | |
567 | { | |
568 | struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); | |
569 | ||
570 | return sprintf(buf, "%#x\n", dcr->vendor_id); | |
571 | } | |
572 | static DEVICE_ATTR_RO(vendor); | |
573 | ||
574 | static ssize_t rev_id_show(struct device *dev, | |
575 | struct device_attribute *attr, char *buf) | |
576 | { | |
577 | struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); | |
578 | ||
579 | return sprintf(buf, "%#x\n", dcr->revision_id); | |
580 | } | |
581 | static DEVICE_ATTR_RO(rev_id); | |
582 | ||
583 | static ssize_t device_show(struct device *dev, | |
584 | struct device_attribute *attr, char *buf) | |
585 | { | |
586 | struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); | |
587 | ||
588 | return sprintf(buf, "%#x\n", dcr->device_id); | |
589 | } | |
590 | static DEVICE_ATTR_RO(device); | |
591 | ||
592 | static ssize_t format_show(struct device *dev, | |
593 | struct device_attribute *attr, char *buf) | |
594 | { | |
595 | struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); | |
596 | ||
597 | return sprintf(buf, "%#x\n", dcr->code); | |
598 | } | |
599 | static DEVICE_ATTR_RO(format); | |
600 | ||
601 | static ssize_t serial_show(struct device *dev, | |
602 | struct device_attribute *attr, char *buf) | |
603 | { | |
604 | struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev); | |
605 | ||
606 | return sprintf(buf, "%#x\n", dcr->serial_number); | |
607 | } | |
608 | static DEVICE_ATTR_RO(serial); | |
609 | ||
610 | static struct attribute *acpi_nfit_dimm_attributes[] = { | |
611 | &dev_attr_handle.attr, | |
612 | &dev_attr_phys_id.attr, | |
613 | &dev_attr_vendor.attr, | |
614 | &dev_attr_device.attr, | |
615 | &dev_attr_format.attr, | |
616 | &dev_attr_serial.attr, | |
617 | &dev_attr_rev_id.attr, | |
618 | NULL, | |
619 | }; | |
620 | ||
621 | static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj, | |
622 | struct attribute *a, int n) | |
623 | { | |
624 | struct device *dev = container_of(kobj, struct device, kobj); | |
625 | ||
626 | if (to_nfit_dcr(dev)) | |
627 | return a->mode; | |
628 | else | |
629 | return 0; | |
630 | } | |
631 | ||
632 | static struct attribute_group acpi_nfit_dimm_attribute_group = { | |
633 | .name = "nfit", | |
634 | .attrs = acpi_nfit_dimm_attributes, | |
635 | .is_visible = acpi_nfit_dimm_attr_visible, | |
636 | }; | |
637 | ||
638 | static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = { | |
62232e45 | 639 | &nvdimm_attribute_group, |
4d88a97a | 640 | &nd_device_attribute_group, |
e6dfb2de DW |
641 | &acpi_nfit_dimm_attribute_group, |
642 | NULL, | |
643 | }; | |
644 | ||
645 | static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc, | |
646 | u32 device_handle) | |
647 | { | |
648 | struct nfit_mem *nfit_mem; | |
649 | ||
650 | list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) | |
651 | if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle) | |
652 | return nfit_mem->nvdimm; | |
653 | ||
654 | return NULL; | |
655 | } | |
656 | ||
62232e45 DW |
657 | static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc, |
658 | struct nfit_mem *nfit_mem, u32 device_handle) | |
659 | { | |
660 | struct acpi_device *adev, *adev_dimm; | |
661 | struct device *dev = acpi_desc->dev; | |
662 | const u8 *uuid = to_nfit_uuid(NFIT_DEV_DIMM); | |
663 | unsigned long long sta; | |
664 | int i, rc = -ENODEV; | |
665 | acpi_status status; | |
666 | ||
667 | nfit_mem->dsm_mask = acpi_desc->dimm_dsm_force_en; | |
668 | adev = to_acpi_dev(acpi_desc); | |
669 | if (!adev) | |
670 | return 0; | |
671 | ||
672 | adev_dimm = acpi_find_child_device(adev, device_handle, false); | |
673 | nfit_mem->adev = adev_dimm; | |
674 | if (!adev_dimm) { | |
675 | dev_err(dev, "no ACPI.NFIT device with _ADR %#x, disabling...\n", | |
676 | device_handle); | |
4d88a97a | 677 | return force_enable_dimms ? 0 : -ENODEV; |
62232e45 DW |
678 | } |
679 | ||
680 | status = acpi_evaluate_integer(adev_dimm->handle, "_STA", NULL, &sta); | |
681 | if (status == AE_NOT_FOUND) { | |
682 | dev_dbg(dev, "%s missing _STA, assuming enabled...\n", | |
683 | dev_name(&adev_dimm->dev)); | |
684 | rc = 0; | |
685 | } else if (ACPI_FAILURE(status)) | |
686 | dev_err(dev, "%s failed to retrieve_STA, disabling...\n", | |
687 | dev_name(&adev_dimm->dev)); | |
688 | else if ((sta & ACPI_STA_DEVICE_ENABLED) == 0) | |
689 | dev_info(dev, "%s disabled by firmware\n", | |
690 | dev_name(&adev_dimm->dev)); | |
691 | else | |
692 | rc = 0; | |
693 | ||
694 | for (i = ND_CMD_SMART; i <= ND_CMD_VENDOR; i++) | |
695 | if (acpi_check_dsm(adev_dimm->handle, uuid, 1, 1ULL << i)) | |
696 | set_bit(i, &nfit_mem->dsm_mask); | |
697 | ||
4d88a97a | 698 | return force_enable_dimms ? 0 : rc; |
62232e45 DW |
699 | } |
700 | ||
e6dfb2de DW |
701 | static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc) |
702 | { | |
703 | struct nfit_mem *nfit_mem; | |
4d88a97a | 704 | int dimm_count = 0; |
e6dfb2de DW |
705 | |
706 | list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) { | |
707 | struct nvdimm *nvdimm; | |
708 | unsigned long flags = 0; | |
709 | u32 device_handle; | |
62232e45 | 710 | int rc; |
e6dfb2de DW |
711 | |
712 | device_handle = __to_nfit_memdev(nfit_mem)->device_handle; | |
713 | nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle); | |
714 | if (nvdimm) { | |
715 | /* | |
716 | * If for some reason we find multiple DCRs the | |
717 | * first one wins | |
718 | */ | |
719 | dev_err(acpi_desc->dev, "duplicate DCR detected: %s\n", | |
720 | nvdimm_name(nvdimm)); | |
721 | continue; | |
722 | } | |
723 | ||
724 | if (nfit_mem->bdw && nfit_mem->memdev_pmem) | |
725 | flags |= NDD_ALIASING; | |
726 | ||
62232e45 DW |
727 | rc = acpi_nfit_add_dimm(acpi_desc, nfit_mem, device_handle); |
728 | if (rc) | |
729 | continue; | |
730 | ||
e6dfb2de | 731 | nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem, |
62232e45 DW |
732 | acpi_nfit_dimm_attribute_groups, |
733 | flags, &nfit_mem->dsm_mask); | |
e6dfb2de DW |
734 | if (!nvdimm) |
735 | return -ENOMEM; | |
736 | ||
737 | nfit_mem->nvdimm = nvdimm; | |
4d88a97a | 738 | dimm_count++; |
e6dfb2de DW |
739 | } |
740 | ||
4d88a97a | 741 | return nvdimm_bus_check_dimm_count(acpi_desc->nvdimm_bus, dimm_count); |
e6dfb2de DW |
742 | } |
743 | ||
62232e45 DW |
744 | static void acpi_nfit_init_dsms(struct acpi_nfit_desc *acpi_desc) |
745 | { | |
746 | struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc; | |
747 | const u8 *uuid = to_nfit_uuid(NFIT_DEV_BUS); | |
748 | struct acpi_device *adev; | |
749 | int i; | |
750 | ||
751 | adev = to_acpi_dev(acpi_desc); | |
752 | if (!adev) | |
753 | return; | |
754 | ||
755 | for (i = ND_CMD_ARS_CAP; i <= ND_CMD_ARS_STATUS; i++) | |
756 | if (acpi_check_dsm(adev->handle, uuid, 1, 1ULL << i)) | |
757 | set_bit(i, &nd_desc->dsm_mask); | |
758 | } | |
759 | ||
1f7df6f8 DW |
760 | static ssize_t range_index_show(struct device *dev, |
761 | struct device_attribute *attr, char *buf) | |
762 | { | |
763 | struct nd_region *nd_region = to_nd_region(dev); | |
764 | struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region); | |
765 | ||
766 | return sprintf(buf, "%d\n", nfit_spa->spa->range_index); | |
767 | } | |
768 | static DEVICE_ATTR_RO(range_index); | |
769 | ||
770 | static struct attribute *acpi_nfit_region_attributes[] = { | |
771 | &dev_attr_range_index.attr, | |
772 | NULL, | |
773 | }; | |
774 | ||
775 | static struct attribute_group acpi_nfit_region_attribute_group = { | |
776 | .name = "nfit", | |
777 | .attrs = acpi_nfit_region_attributes, | |
778 | }; | |
779 | ||
780 | static const struct attribute_group *acpi_nfit_region_attribute_groups[] = { | |
781 | &nd_region_attribute_group, | |
782 | &nd_mapping_attribute_group, | |
3d88002e | 783 | &nd_device_attribute_group, |
1f7df6f8 DW |
784 | &acpi_nfit_region_attribute_group, |
785 | NULL, | |
786 | }; | |
787 | ||
788 | static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc, | |
789 | struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc, | |
790 | struct acpi_nfit_memory_map *memdev, | |
791 | struct acpi_nfit_system_address *spa) | |
792 | { | |
793 | struct nvdimm *nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, | |
794 | memdev->device_handle); | |
795 | struct nfit_mem *nfit_mem; | |
796 | int blk_valid = 0; | |
797 | ||
798 | if (!nvdimm) { | |
799 | dev_err(acpi_desc->dev, "spa%d dimm: %#x not found\n", | |
800 | spa->range_index, memdev->device_handle); | |
801 | return -ENODEV; | |
802 | } | |
803 | ||
804 | nd_mapping->nvdimm = nvdimm; | |
805 | switch (nfit_spa_type(spa)) { | |
806 | case NFIT_SPA_PM: | |
807 | case NFIT_SPA_VOLATILE: | |
808 | nd_mapping->start = memdev->address; | |
809 | nd_mapping->size = memdev->region_size; | |
810 | break; | |
811 | case NFIT_SPA_DCR: | |
812 | nfit_mem = nvdimm_provider_data(nvdimm); | |
813 | if (!nfit_mem || !nfit_mem->bdw) { | |
814 | dev_dbg(acpi_desc->dev, "spa%d %s missing bdw\n", | |
815 | spa->range_index, nvdimm_name(nvdimm)); | |
816 | } else { | |
817 | nd_mapping->size = nfit_mem->bdw->capacity; | |
818 | nd_mapping->start = nfit_mem->bdw->start_address; | |
819 | blk_valid = 1; | |
820 | } | |
821 | ||
822 | ndr_desc->nd_mapping = nd_mapping; | |
823 | ndr_desc->num_mappings = blk_valid; | |
824 | if (!nvdimm_blk_region_create(acpi_desc->nvdimm_bus, ndr_desc)) | |
825 | return -ENOMEM; | |
826 | break; | |
827 | } | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
832 | static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc, | |
833 | struct nfit_spa *nfit_spa) | |
834 | { | |
835 | static struct nd_mapping nd_mappings[ND_MAX_MAPPINGS]; | |
836 | struct acpi_nfit_system_address *spa = nfit_spa->spa; | |
837 | struct nfit_memdev *nfit_memdev; | |
838 | struct nd_region_desc ndr_desc; | |
839 | struct nvdimm_bus *nvdimm_bus; | |
840 | struct resource res; | |
841 | int count = 0; | |
842 | ||
843 | if (spa->range_index == 0) { | |
844 | dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n", | |
845 | __func__); | |
846 | return 0; | |
847 | } | |
848 | ||
849 | memset(&res, 0, sizeof(res)); | |
850 | memset(&nd_mappings, 0, sizeof(nd_mappings)); | |
851 | memset(&ndr_desc, 0, sizeof(ndr_desc)); | |
852 | res.start = spa->address; | |
853 | res.end = res.start + spa->length - 1; | |
854 | ndr_desc.res = &res; | |
855 | ndr_desc.provider_data = nfit_spa; | |
856 | ndr_desc.attr_groups = acpi_nfit_region_attribute_groups; | |
857 | list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) { | |
858 | struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev; | |
859 | struct nd_mapping *nd_mapping; | |
860 | int rc; | |
861 | ||
862 | if (memdev->range_index != spa->range_index) | |
863 | continue; | |
864 | if (count >= ND_MAX_MAPPINGS) { | |
865 | dev_err(acpi_desc->dev, "spa%d exceeds max mappings %d\n", | |
866 | spa->range_index, ND_MAX_MAPPINGS); | |
867 | return -ENXIO; | |
868 | } | |
869 | nd_mapping = &nd_mappings[count++]; | |
870 | rc = acpi_nfit_init_mapping(acpi_desc, nd_mapping, &ndr_desc, | |
871 | memdev, spa); | |
872 | if (rc) | |
873 | return rc; | |
874 | } | |
875 | ||
876 | ndr_desc.nd_mapping = nd_mappings; | |
877 | ndr_desc.num_mappings = count; | |
878 | nvdimm_bus = acpi_desc->nvdimm_bus; | |
879 | if (nfit_spa_type(spa) == NFIT_SPA_PM) { | |
880 | if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) | |
881 | return -ENOMEM; | |
882 | } else if (nfit_spa_type(spa) == NFIT_SPA_VOLATILE) { | |
883 | if (!nvdimm_volatile_region_create(nvdimm_bus, &ndr_desc)) | |
884 | return -ENOMEM; | |
885 | } | |
886 | return 0; | |
887 | } | |
888 | ||
889 | static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc) | |
890 | { | |
891 | struct nfit_spa *nfit_spa; | |
892 | ||
893 | list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { | |
894 | int rc = acpi_nfit_register_region(acpi_desc, nfit_spa); | |
895 | ||
896 | if (rc) | |
897 | return rc; | |
898 | } | |
899 | return 0; | |
900 | } | |
901 | ||
b94d5230 DW |
902 | static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz) |
903 | { | |
904 | struct device *dev = acpi_desc->dev; | |
905 | const void *end; | |
906 | u8 *data; | |
1f7df6f8 | 907 | int rc; |
b94d5230 DW |
908 | |
909 | INIT_LIST_HEAD(&acpi_desc->spas); | |
910 | INIT_LIST_HEAD(&acpi_desc->dcrs); | |
911 | INIT_LIST_HEAD(&acpi_desc->bdws); | |
912 | INIT_LIST_HEAD(&acpi_desc->memdevs); | |
913 | INIT_LIST_HEAD(&acpi_desc->dimms); | |
914 | ||
915 | data = (u8 *) acpi_desc->nfit; | |
916 | end = data + sz; | |
917 | data += sizeof(struct acpi_table_nfit); | |
918 | while (!IS_ERR_OR_NULL(data)) | |
919 | data = add_table(acpi_desc, data, end); | |
920 | ||
921 | if (IS_ERR(data)) { | |
922 | dev_dbg(dev, "%s: nfit table parsing error: %ld\n", __func__, | |
923 | PTR_ERR(data)); | |
924 | return PTR_ERR(data); | |
925 | } | |
926 | ||
927 | if (nfit_mem_init(acpi_desc) != 0) | |
928 | return -ENOMEM; | |
929 | ||
62232e45 DW |
930 | acpi_nfit_init_dsms(acpi_desc); |
931 | ||
1f7df6f8 DW |
932 | rc = acpi_nfit_register_dimms(acpi_desc); |
933 | if (rc) | |
934 | return rc; | |
935 | ||
936 | return acpi_nfit_register_regions(acpi_desc); | |
b94d5230 DW |
937 | } |
938 | ||
939 | static int acpi_nfit_add(struct acpi_device *adev) | |
940 | { | |
941 | struct nvdimm_bus_descriptor *nd_desc; | |
942 | struct acpi_nfit_desc *acpi_desc; | |
943 | struct device *dev = &adev->dev; | |
944 | struct acpi_table_header *tbl; | |
945 | acpi_status status = AE_OK; | |
946 | acpi_size sz; | |
947 | int rc; | |
948 | ||
949 | status = acpi_get_table_with_size("NFIT", 0, &tbl, &sz); | |
950 | if (ACPI_FAILURE(status)) { | |
951 | dev_err(dev, "failed to find NFIT\n"); | |
952 | return -ENXIO; | |
953 | } | |
954 | ||
955 | acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL); | |
956 | if (!acpi_desc) | |
957 | return -ENOMEM; | |
958 | ||
959 | dev_set_drvdata(dev, acpi_desc); | |
960 | acpi_desc->dev = dev; | |
961 | acpi_desc->nfit = (struct acpi_table_nfit *) tbl; | |
962 | nd_desc = &acpi_desc->nd_desc; | |
963 | nd_desc->provider_name = "ACPI.NFIT"; | |
964 | nd_desc->ndctl = acpi_nfit_ctl; | |
45def22c | 965 | nd_desc->attr_groups = acpi_nfit_attribute_groups; |
b94d5230 DW |
966 | |
967 | acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc); | |
968 | if (!acpi_desc->nvdimm_bus) | |
969 | return -ENXIO; | |
970 | ||
971 | rc = acpi_nfit_init(acpi_desc, sz); | |
972 | if (rc) { | |
973 | nvdimm_bus_unregister(acpi_desc->nvdimm_bus); | |
974 | return rc; | |
975 | } | |
976 | return 0; | |
977 | } | |
978 | ||
979 | static int acpi_nfit_remove(struct acpi_device *adev) | |
980 | { | |
981 | struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(&adev->dev); | |
982 | ||
983 | nvdimm_bus_unregister(acpi_desc->nvdimm_bus); | |
984 | return 0; | |
985 | } | |
986 | ||
987 | static const struct acpi_device_id acpi_nfit_ids[] = { | |
988 | { "ACPI0012", 0 }, | |
989 | { "", 0 }, | |
990 | }; | |
991 | MODULE_DEVICE_TABLE(acpi, acpi_nfit_ids); | |
992 | ||
993 | static struct acpi_driver acpi_nfit_driver = { | |
994 | .name = KBUILD_MODNAME, | |
995 | .ids = acpi_nfit_ids, | |
996 | .ops = { | |
997 | .add = acpi_nfit_add, | |
998 | .remove = acpi_nfit_remove, | |
999 | }, | |
1000 | }; | |
1001 | ||
1002 | static __init int nfit_init(void) | |
1003 | { | |
1004 | BUILD_BUG_ON(sizeof(struct acpi_table_nfit) != 40); | |
1005 | BUILD_BUG_ON(sizeof(struct acpi_nfit_system_address) != 56); | |
1006 | BUILD_BUG_ON(sizeof(struct acpi_nfit_memory_map) != 48); | |
1007 | BUILD_BUG_ON(sizeof(struct acpi_nfit_interleave) != 20); | |
1008 | BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9); | |
1009 | BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80); | |
1010 | BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40); | |
1011 | ||
1012 | acpi_str_to_uuid(UUID_VOLATILE_MEMORY, nfit_uuid[NFIT_SPA_VOLATILE]); | |
1013 | acpi_str_to_uuid(UUID_PERSISTENT_MEMORY, nfit_uuid[NFIT_SPA_PM]); | |
1014 | acpi_str_to_uuid(UUID_CONTROL_REGION, nfit_uuid[NFIT_SPA_DCR]); | |
1015 | acpi_str_to_uuid(UUID_DATA_REGION, nfit_uuid[NFIT_SPA_BDW]); | |
1016 | acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_VDISK]); | |
1017 | acpi_str_to_uuid(UUID_VOLATILE_VIRTUAL_CD, nfit_uuid[NFIT_SPA_VCD]); | |
1018 | acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_DISK, nfit_uuid[NFIT_SPA_PDISK]); | |
1019 | acpi_str_to_uuid(UUID_PERSISTENT_VIRTUAL_CD, nfit_uuid[NFIT_SPA_PCD]); | |
1020 | acpi_str_to_uuid(UUID_NFIT_BUS, nfit_uuid[NFIT_DEV_BUS]); | |
1021 | acpi_str_to_uuid(UUID_NFIT_DIMM, nfit_uuid[NFIT_DEV_DIMM]); | |
1022 | ||
1023 | return acpi_bus_register_driver(&acpi_nfit_driver); | |
1024 | } | |
1025 | ||
1026 | static __exit void nfit_exit(void) | |
1027 | { | |
1028 | acpi_bus_unregister_driver(&acpi_nfit_driver); | |
1029 | } | |
1030 | ||
1031 | module_init(nfit_init); | |
1032 | module_exit(nfit_exit); | |
1033 | MODULE_LICENSE("GPL v2"); | |
1034 | MODULE_AUTHOR("Intel Corporation"); |